1310 files changed, 130662 insertions, 80091 deletions

diff --git a/.gitignore b/.gitignore
index 9e10c141..db8a893a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,7 +19,7 @@ m4/lt~obsolete.m4
 autom4te.cache
 
 # downloaded files
-gmock
+/gmock
 
 # in-tree configure-generated files
 Makefile
@@ -47,7 +47,6 @@ any_test.pb.*
 map*unittest.pb.*
 unittest*.pb.*
 cpp_test*.pb.*
-src/google/protobuf/compiler/js/well_known_types_embed.cc
 src/google/protobuf/util/**/*.pb.cc
 src/google/protobuf/util/**/*.pb.h
 
@@ -58,13 +57,14 @@ python/*.egg
 python/.eggs/
 python/.tox
 python/build/
-python/google/protobuf/compiler/
-python/google/protobuf/util/
 
 src/js_embed
 src/protoc
 src/unittest_proto_middleman
 
+# vim generated
+*.swp
+
 # Generated test scaffolding
 src/no_warning_test.cc
 src/no-warning-test
@@ -84,6 +84,8 @@ src/**/*.trs
 java/core/target
 java/util/target
 javanano/target
+java/.idea
+java/**/*.iml
 
 # Windows native output.
 cmake/build
@@ -113,9 +115,11 @@ conformance/conformance.pb.cc
 conformance/conformance.pb.h
 conformance/Conformance.pbobjc.h
 conformance/Conformance.pbobjc.m
+conformance/conformance_pb.js
 conformance/conformance_pb.rb
 conformance/failing_tests.txt
 conformance/google/
+conformance/google-protobuf/
 conformance/javac_middleman
 conformance/lite/
 conformance/nonexistent_tests.txt
@@ -127,10 +131,13 @@ conformance/Google/
 conformance/Protobuf_test_messages/
 conformance/conformance-php
 conformance/conformance-php-c
+conformance/*.class
 
 # php test output
 composer.lock
 php/tests/generated/
+php/tests/old_protoc
+php/tests/protobuf/
 php/ext/google/protobuf/.libs/
 php/ext/google/protobuf/Makefile.fragments
 php/ext/google/protobuf/Makefile.global
@@ -146,8 +153,36 @@ vendor/
 
 # JavaScript artifacts
 js/commonjs_out/
+js/compatibility_tests/v3.0.0/commonjs_out*
+js/compatibility_tests/v3.0.0/protoc
+js/compatibility_tests/v3.0.0/testproto_libs1.js
+js/compatibility_tests/v3.0.0/testproto_libs1_new.js
+js/compatibility_tests/v3.0.0/testproto_libs2.js
+js/compatibility_tests/v3.0.0/testproto_libs2_new.js
 js/deps.js
 js/google-protobuf.js
 js/google/
 js/node_modules/
-js/testproto_libs.js
+js/testproto_libs1.js
+js/testproto_libs2.js
+
+# Ignore the bazel symlinks
+/bazel-*
+
+# ruby test output
+ruby/lib/
+ruby/tests/generated_code_pb.rb
+ruby/tests/test_import_pb.rb
+ruby/tests/test_ruby_package_pb.rb
+ruby/Gemfile.lock
+ruby/compatibility_tests/v3.0.0/protoc
+ruby/compatibility_tests/v3.0.0/tests/generated_code_pb.rb
+ruby/compatibility_tests/v3.0.0/tests/test_import_pb.rb
+
+# IntelliJ CLion Config files and build output
+cmake/.idea
+cmake/cmake-build-debug/
+
+# Common build subdirectories.
+./.build/
+./_build/
diff --git a/.gitmodules b/.gitmodules
index 55a47cea..bcd125a4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,7 @@
 [submodule "third_party/benchmark"]
 	path = third_party/benchmark
 	url = https://github.com/google/benchmark.git
+[submodule "third_party/googletest"]
+	path = third_party/googletest
+	url = https://github.com/google/googletest.git
+	ignore = dirty
diff --git a/.travis.yml b/.travis.yml
index 77662993..74d4ea7b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,60 +1,74 @@
-sudo: required
-dist: trusty
-# Note: travis currently does not support listing more than one language so
-# this cheats and claims to only be cpp.  If they add multiple language
-# support, this should probably get updated to install steps and/or
-# rvm/gemfile/jdk/etc. entries rather than manually doing the work.
+# Everything is driven by the test.sh, so the language doesn't really
+# matter, it just controls the default install/script/etc. steps on
+# travis.
 language: cpp
-os:
-  - osx
-# The Objective C build needs Xcode 7.0 or later.
-osx_image: xcode8.1
-script:
-  - ./tests.sh $CONFIG
-env:
-  - CONFIG=cpp
-  - CONFIG=cpp_distcheck
-  - CONFIG=golang
-  - CONFIG=java_jdk7
-  - CONFIG=java_oracle7
-  - CONFIG=javanano_jdk7
-  - CONFIG=javanano_oracle7
-  - CONFIG=javascript
-  # iOS build log was starting to choke travis UI, so split to cover the
-  # Xcode Debug and Release Configurations independently.
-  - CONFIG=objectivec_ios_debug
-  - CONFIG=objectivec_ios_release
-  - CONFIG=objectivec_osx
-  - CONFIG=objectivec_cocoapods_integration
-  - CONFIG=python
-  - CONFIG=python_cpp
-  - CONFIG=ruby21
-  - CONFIG=ruby22
-  - CONFIG=jruby
-  - CONFIG=php5.6_mac
+script: ./tests.sh $CONFIG
+
+# The test matrix is manually built to cover a mix of linux and macOS
+# hosted setups; this lets some extra settings be done specific to each
+# host/language instead of forcing common values on all the tests.
 matrix:
-  exclude:
-    # It's nontrivial to programmatically install a new JDK from the command
-    # line on OS X, so we rely on testing on Linux for Java code.
+  include:
+    # -----------------------------------------------------------------
+    # macOS hosted tests for Objective-C
+
+    - os: osx
+      env: CONFIG=objectivec_osx
+      osx_image: xcode9.3
+      language: objective-c
+    # iOS build log was starting to choke travis UI, so split to cover the
+    # Xcode Debug and Release Configurations independently.
     - os: osx
-      env: CONFIG=java_jdk7
+      env: CONFIG=objectivec_ios_debug
+      osx_image: xcode9.3
+      language: objective-c
     - os: osx
-      env: CONFIG=java_oracle7
+      env: CONFIG=objectivec_ios_release
+      osx_image: xcode9.3
+      language: objective-c
     - os: osx
-      env: CONFIG=javanano_jdk7
+      env: CONFIG=objectivec_cocoapods_integration
+      osx_image: xcode9.3
+      language: objective-c
+
+    # -----------------------------------------------------------------
+    # macOS hosted tests for other languages.
+
     - os: osx
-      env: CONFIG=javanano_oracle7
-    # Requires installing golang, currently travis.sh is doing that with apt-get
-    # which doesn't work on OS X.
+      env: CONFIG=cpp
     - os: osx
-      env: CONFIG=golang
-  include:
+      env: CONFIG=cpp_distcheck
+    - os: osx
+      env: CONFIG=javascript
+    - os: osx
+      env: CONFIG=python
+    - os: osx
+      env: CONFIG=python_cpp
+    - os: osx
+      env: CONFIG=php5.6_mac
+    - os: osx
+      env: CONFIG=php7.0_mac
+
+    # -----------------------------------------------------------------
+    # Linux hosted tests
+
     # The dotnet environment requires Ubuntu 14.04 or 16.04. This
     # configuration is effectively an "extra" one, outside the
     # autogenerated matrix.
     - os: linux
       env: CONFIG=csharp
+      language: csharp
       dist: trusty
+      dotnet: 2.0.3
+      mono: none
+      # Install the .NET Core 1.0 runtime as that's what we test against
+      addons:
+        apt:
+          sources:
+          - sourceline: 'deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-trusty-prod trusty main'
+            key_url: 'https://packages.microsoft.com/keys/microsoft.asc'
+          packages:
+          - dotnet-sharedframework-microsoft.netcore.app-1.0.5
     # This test is kept on travis because it doesn't play nicely with other
     # tests on jenkins running in parallel.
     - os: linux
@@ -63,25 +77,14 @@ matrix:
     # fetch pre-built Linux protoc binaries in the test.
     - os: linux
       env: CONFIG=java_compatibility
+      sudo: required
+      dist: trusty
     # The Python compatibility test currently only runs on Linux because it will
     # fetch pre-built Linux protoc binaries in the test.
     - os: linux
       env: CONFIG=python_compatibility
-  allow_failures:
-    # These currently do not work on OS X but are being worked on by @haberman.
-    - os: osx
-      env: CONFIG=ruby22
-    - os: osx
-      env: CONFIG=jruby
-    # https://github.com/google/protobuf/issues/1253 - Started failing when
-    # we moved to an OS X image that is 10.11.
-    - os: osx
-      env: CONFIG=python_cpp
-    # Mark the iOS test as flakey as xcodebuild some times fails to start the
-    # iOS Simulator.
-    - os: osx
-      env: CONFIG=objectivec_ios_debug
-    - os: osx
-      env: CONFIG=objectivec_ios_release
+      sudo: required
+      dist: trusty
+
 notifications:
   email: false
diff --git a/BUILD b/BUILD
index bf894628..8be2428b 100644
--- a/BUILD
+++ b/BUILD
@@ -1,22 +1,62 @@
-# Bazel (http://bazel.io/) BUILD file for Protobuf.
+# Bazel (https://bazel.build/) BUILD file for Protobuf.
 
 licenses(["notice"])
 
 exports_files(["LICENSE"])
 
 ################################################################################
+# Java 9 configuration
+################################################################################
+
+config_setting(
+    name = "jdk9",
+    values = {
+        "java_toolchain": "@bazel_tools//tools/jdk:toolchain_jdk9",
+    },
+)
+
+################################################################################
 # Protobuf Runtime Library
 ################################################################################
 
-COPTS = [
-    "-DHAVE_PTHREAD",
-    "-Wall",
-    "-Wwrite-strings",
-    "-Woverloaded-virtual",
-    "-Wno-sign-compare",
-    "-Wno-unused-function",
+MSVC_COPTS = [
+    "/DHAVE_PTHREAD",
+    "/wd4018", # -Wno-sign-compare
+    "/wd4065", # switch statement contains 'default' but no 'case' labels
+    "/wd4146", # unary minus operator applied to unsigned type, result still unsigned
+    "/wd4244", # 'conversion' conversion from 'type1' to 'type2', possible loss of data
+    "/wd4251", # 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'
+    "/wd4267", # 'var' : conversion from 'size_t' to 'type', possible loss of data
+    "/wd4305", # 'identifier' : truncation from 'type1' to 'type2'
+    "/wd4307", # 'operator' : integral constant overflow
+    "/wd4309", # 'conversion' : truncation of constant value
+    "/wd4334", # 'operator' : result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
+    "/wd4355", # 'this' : used in base member initializer list
+    "/wd4506", # no definition for inline function 'function'
+    "/wd4514", # -Wno-unused-function
+    "/wd4800", # 'type' : forcing value to bool 'true' or 'false' (performance warning)
+    "/wd4996", # The compiler encountered a deprecated declaration.
 ]
 
+COPTS = select({
+    ":msvc" : MSVC_COPTS,
+    "//conditions:default": [
+        "-DHAVE_PTHREAD",
+        "-Wall",
+        "-Wwrite-strings",
+        "-Woverloaded-virtual",
+        "-Wno-sign-compare",
+        "-Wno-unused-function",
+        # Prevents ISO C++ const string assignment warnings for pyext sources.
+        "-Wno-writable-strings",
+    ],
+})
+
+config_setting(
+    name = "msvc",
+    values = { "compiler": "msvc-cl" },
+)
+
 config_setting(
     name = "android",
     values = {
@@ -24,9 +64,13 @@ config_setting(
     },
 )
 
-# Android builds do not need to link in a separate pthread library.
+# Android and MSVC builds do not need to link in a separate pthread library.
 LINK_OPTS = select({
     ":android": [],
+    ":msvc": [
+        # Suppress linker warnings about files with no symbols defined.
+        "-ignore:4221",
+    ],
     "//conditions:default": ["-lpthread", "-lm"],
 })
 
@@ -39,37 +83,6 @@ load(
     "internal_protobuf_py_tests",
 )
 
-config_setting(
-    name = "ios_armv7",
-    values = {
-        "ios_cpu": "armv7",
-    },
-)
-
-config_setting(
-    name = "ios_armv7s",
-    values = {
-        "ios_cpu": "armv7s",
-    },
-)
-
-config_setting(
-    name = "ios_arm64",
-    values = {
-        "ios_cpu": "arm64",
-    },
-)
-
-IOS_ARM_COPTS = COPTS + [
-    "-DOS_IOS",
-    "-miphoneos-version-min=7.0",
-    "-arch armv7",
-    "-arch armv7s",
-    "-arch arm64",
-    "-D__thread=",
-    "-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/",
-]
-
 cc_library(
     name = "protobuf_lite",
     srcs = [
@@ -77,18 +90,18 @@ cc_library(
         "src/google/protobuf/arena.cc",
         "src/google/protobuf/arenastring.cc",
         "src/google/protobuf/extension_set.cc",
+        "src/google/protobuf/generated_message_table_driven_lite.cc",
         "src/google/protobuf/generated_message_util.cc",
+        "src/google/protobuf/implicit_weak_message.cc",
         "src/google/protobuf/io/coded_stream.cc",
         "src/google/protobuf/io/zero_copy_stream.cc",
         "src/google/protobuf/io/zero_copy_stream_impl_lite.cc",
         "src/google/protobuf/message_lite.cc",
         "src/google/protobuf/repeated_field.cc",
-        "src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc",
-        "src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc",
         "src/google/protobuf/stubs/bytestream.cc",
         "src/google/protobuf/stubs/common.cc",
         "src/google/protobuf/stubs/int128.cc",
-        "src/google/protobuf/stubs/once.cc",
+        "src/google/protobuf/stubs/io_win32.cc",
         "src/google/protobuf/stubs/status.cc",
         "src/google/protobuf/stubs/statusor.cc",
         "src/google/protobuf/stubs/stringpiece.cc",
@@ -99,12 +112,7 @@ cc_library(
         "src/google/protobuf/wire_format_lite.cc",
     ],
     hdrs = glob(["src/google/protobuf/**/*.h"]),
-    copts = select({
-        ":ios_armv7": IOS_ARM_COPTS,
-        ":ios_armv7s": IOS_ARM_COPTS,
-        ":ios_arm64": IOS_ARM_COPTS,
-        "//conditions:default": COPTS,
-    }),
+    copts = COPTS,
     includes = ["src/"],
     linkopts = LINK_OPTS,
     visibility = ["//visibility:public"],
@@ -128,6 +136,7 @@ cc_library(
         "src/google/protobuf/extension_set_heavy.cc",
         "src/google/protobuf/field_mask.pb.cc",
         "src/google/protobuf/generated_message_reflection.cc",
+        "src/google/protobuf/generated_message_table_driven.cc",
         "src/google/protobuf/io/gzip_stream.cc",
         "src/google/protobuf/io/printer.cc",
         "src/google/protobuf/io/strtod.cc",
@@ -145,6 +154,7 @@ cc_library(
         "src/google/protobuf/timestamp.pb.cc",
         "src/google/protobuf/type.pb.cc",
         "src/google/protobuf/unknown_field_set.cc",
+        "src/google/protobuf/util/delimited_message_util.cc",
         "src/google/protobuf/util/field_comparator.cc",
         "src/google/protobuf/util/field_mask_util.cc",
         "src/google/protobuf/util/internal/datapiece.cc",
@@ -169,12 +179,7 @@ cc_library(
         "src/google/protobuf/wrappers.pb.cc",
     ],
     hdrs = glob(["src/**/*.h"]),
-    copts = select({
-        ":ios_armv7": IOS_ARM_COPTS,
-        ":ios_armv7s": IOS_ARM_COPTS,
-        ":ios_arm64": IOS_ARM_COPTS,
-        "//conditions:default": COPTS,
-    }),
+    copts = COPTS,
     includes = ["src/"],
     linkopts = LINK_OPTS,
     visibility = ["//visibility:public"],
@@ -200,21 +205,24 @@ objc_library(
     visibility = ["//visibility:public"],
 )
 
-RELATIVE_WELL_KNOWN_PROTOS = [
-    # AUTOGEN(well_known_protos)
-    "google/protobuf/any.proto",
-    "google/protobuf/api.proto",
-    "google/protobuf/compiler/plugin.proto",
-    "google/protobuf/descriptor.proto",
-    "google/protobuf/duration.proto",
-    "google/protobuf/empty.proto",
-    "google/protobuf/field_mask.proto",
-    "google/protobuf/source_context.proto",
-    "google/protobuf/struct.proto",
-    "google/protobuf/timestamp.proto",
-    "google/protobuf/type.proto",
-    "google/protobuf/wrappers.proto",
-]
+# Map of all well known protos.
+# name => (include path, imports)
+WELL_KNOWN_PROTO_MAP = {
+    "any" : ("google/protobuf/any.proto", []),
+    "api" : ("google/protobuf/api.proto", ["source_context", "type"]),
+    "compiler_plugin" : ("google/protobuf/compiler/plugin.proto", ["descriptor"]),
+    "descriptor" : ("google/protobuf/descriptor.proto", []),
+    "duration" : ("google/protobuf/duration.proto", []),
+    "empty" : ("google/protobuf/empty.proto", []),
+    "field_mask" : ("google/protobuf/field_mask.proto", []),
+    "source_context" : ("google/protobuf/source_context.proto", []),
+    "struct" : ("google/protobuf/struct.proto", []),
+    "timestamp" : ("google/protobuf/timestamp.proto", []),
+    "type" : ("google/protobuf/type.proto", ["any", "source_context"]),
+    "wrappers" : ("google/protobuf/wrappers.proto", []),
+}
+
+RELATIVE_WELL_KNOWN_PROTOS = [proto[1][0] for proto in WELL_KNOWN_PROTO_MAP.items()]
 
 WELL_KNOWN_PROTOS = ["src/" + s for s in RELATIVE_WELL_KNOWN_PROTOS]
 
@@ -235,26 +243,35 @@ cc_proto_library(
 )
 
 ################################################################################
-# Protocol Buffers Compiler
+# Well Known Types Proto Library Rules
+#
+# These proto_library rules can be used with one of the language specific proto
+# library rules i.e. java_proto_library:
+#
+# java_proto_library(
+#   name = "any_java_proto",
+#   deps = ["@com_google_protobuf//:any_proto],
+# )
 ################################################################################
 
-cc_binary(
-    name = "js_embed",
-    srcs = ["src/google/protobuf/compiler/js/embed.cc"],
-    visibility = ["//visibility:public"],
+internal_copied_filegroup(
+    name = "_internal_wkt_protos",
+    srcs = WELL_KNOWN_PROTOS,
+    dest = "",
+    strip_prefix = "src",
+    visibility = ["//visibility:private"],
 )
 
-genrule(
-    name = "generate_js_well_known_types_embed",
-    srcs = [
-        "src/google/protobuf/compiler/js/well_known_types/any.js",
-        "src/google/protobuf/compiler/js/well_known_types/struct.js",
-        "src/google/protobuf/compiler/js/well_known_types/timestamp.js",
-    ],
-    outs = ["src/google/protobuf/compiler/js/well_known_types_embed.cc"],
-    cmd = "$(location :js_embed) $(SRCS) > $@",
-    tools = [":js_embed"],
-)
+[proto_library(
+    name = proto[0] + "_proto",
+    srcs = [proto[1][0]],
+    deps = [dep + "_proto" for dep in proto[1][1]],
+    visibility = ["//visibility:public"],
+    ) for proto in WELL_KNOWN_PROTO_MAP.items()]
+
+################################################################################
+# Protocol Buffers Compiler
+################################################################################
 
 cc_library(
     name = "protoc_lib",
@@ -272,6 +289,7 @@ cc_library(
         "src/google/protobuf/compiler/cpp/cpp_map_field.cc",
         "src/google/protobuf/compiler/cpp/cpp_message.cc",
         "src/google/protobuf/compiler/cpp/cpp_message_field.cc",
+        "src/google/protobuf/compiler/cpp/cpp_padding_optimizer.cc",
         "src/google/protobuf/compiler/cpp/cpp_primitive_field.cc",
         "src/google/protobuf/compiler/cpp/cpp_service.cc",
         "src/google/protobuf/compiler/cpp/cpp_string_field.cc",
@@ -321,17 +339,6 @@ cc_library(
         "src/google/protobuf/compiler/java/java_shared_code_generator.cc",
         "src/google/protobuf/compiler/java/java_string_field.cc",
         "src/google/protobuf/compiler/java/java_string_field_lite.cc",
-        "src/google/protobuf/compiler/javanano/javanano_enum.cc",
-        "src/google/protobuf/compiler/javanano/javanano_enum_field.cc",
-        "src/google/protobuf/compiler/javanano/javanano_extension.cc",
-        "src/google/protobuf/compiler/javanano/javanano_field.cc",
-        "src/google/protobuf/compiler/javanano/javanano_file.cc",
-        "src/google/protobuf/compiler/javanano/javanano_generator.cc",
-        "src/google/protobuf/compiler/javanano/javanano_helpers.cc",
-        "src/google/protobuf/compiler/javanano/javanano_map_field.cc",
-        "src/google/protobuf/compiler/javanano/javanano_message.cc",
-        "src/google/protobuf/compiler/javanano/javanano_message_field.cc",
-        "src/google/protobuf/compiler/javanano/javanano_primitive_field.cc",
         "src/google/protobuf/compiler/js/js_generator.cc",
         "src/google/protobuf/compiler/js/well_known_types_embed.cc",
         "src/google/protobuf/compiler/objectivec/objectivec_enum.cc",
@@ -356,7 +363,25 @@ cc_library(
     ],
     copts = COPTS,
     includes = ["src/"],
-    linkopts = LINK_OPTS,
+    linkopts = LINK_OPTS + select({
+        ":msvc": [
+            # Linking to setargv.obj makes the default command line argument
+            # parser expand wildcards, so the main method's argv will contain the
+            # expanded list instead of the wildcards.
+            #
+            # Adding dummy "-DEFAULTLIB:kernel32.lib", because:
+            # - Microsoft ships this object file next to default libraries
+            # - but this file is not a library, just a precompiled object
+            # - "-WHOLEARCHIVE" and "-DEFAULTLIB" only accept library,
+            #   not precompiled object.
+            # - Bazel would assume linkopt that does not start with "-" or "$"
+            #   as a label to a target, so we add a harmless "-DEFAULTLIB:kernel32.lib"
+            #   before "setargv.obj".
+            # See https://msdn.microsoft.com/en-us/library/8bch7bkk.aspx
+            "-DEFAULTLIB:kernel32.lib setargv.obj",
+        ],
+        "//conditions:default": [],
+    }),
     visibility = ["//visibility:public"],
     deps = [":protobuf"],
 )
@@ -400,6 +425,9 @@ RELATIVE_TEST_PROTOS = [
     "google/protobuf/unittest_enormous_descriptor.proto",
     "google/protobuf/unittest_import.proto",
     "google/protobuf/unittest_import_public.proto",
+    "google/protobuf/unittest_lazy_dependencies.proto",
+    "google/protobuf/unittest_lazy_dependencies_custom_option.proto",
+    "google/protobuf/unittest_lazy_dependencies_enum.proto",
     "google/protobuf/unittest_lite_imports_nonlite.proto",
     "google/protobuf/unittest_mset.proto",
     "google/protobuf/unittest_mset_wire_format.proto",
@@ -445,6 +473,7 @@ COMMON_TEST_SRCS = [
     "src/google/protobuf/arena_test_util.cc",
     "src/google/protobuf/map_test_util.cc",
     "src/google/protobuf/test_util.cc",
+    "src/google/protobuf/test_util.inc",
     "src/google/protobuf/testing/file.cc",
     "src/google/protobuf/testing/googletest.cc",
 ]
@@ -465,17 +494,31 @@ cc_binary(
 )
 
 cc_test(
+    name = "win32_test",
+    srcs = ["src/google/protobuf/stubs/io_win32_unittest.cc"],
+    deps = [
+        ":protobuf_lite",
+        "//external:gtest_main",
+    ],
+    tags = ["manual", "windows"],
+)
+
+cc_test(
     name = "protobuf_test",
     srcs = COMMON_TEST_SRCS + [
         # AUTOGEN(test_srcs)
         "src/google/protobuf/any_test.cc",
         "src/google/protobuf/arena_unittest.cc",
         "src/google/protobuf/arenastring_unittest.cc",
+        "src/google/protobuf/compiler/annotation_test_util.cc",
         "src/google/protobuf/compiler/command_line_interface_unittest.cc",
         "src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc",
+        "src/google/protobuf/compiler/cpp/cpp_move_unittest.cc",
         "src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc",
         "src/google/protobuf/compiler/cpp/cpp_unittest.cc",
+        "src/google/protobuf/compiler/cpp/cpp_unittest.inc",
         "src/google/protobuf/compiler/cpp/metadata_test.cc",
+        "src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc",
         "src/google/protobuf/compiler/csharp/csharp_generator_unittest.cc",
         "src/google/protobuf/compiler/importer_unittest.cc",
         "src/google/protobuf/compiler/java/java_doc_comment_unittest.cc",
@@ -498,6 +541,7 @@ cc_test(
         "src/google/protobuf/map_field_test.cc",
         "src/google/protobuf/map_test.cc",
         "src/google/protobuf/message_unittest.cc",
+        "src/google/protobuf/message_unittest.inc",
         "src/google/protobuf/no_field_presence_test.cc",
         "src/google/protobuf/preserve_unknown_enum_test.cc",
         "src/google/protobuf/proto3_arena_lite_unittest.cc",
@@ -509,7 +553,7 @@ cc_test(
         "src/google/protobuf/stubs/bytestream_unittest.cc",
         "src/google/protobuf/stubs/common_unittest.cc",
         "src/google/protobuf/stubs/int128_unittest.cc",
-        "src/google/protobuf/stubs/once_unittest.cc",
+        "src/google/protobuf/stubs/io_win32_unittest.cc",
         "src/google/protobuf/stubs/status_test.cc",
         "src/google/protobuf/stubs/statusor_test.cc",
         "src/google/protobuf/stubs/stringpiece_unittest.cc",
@@ -518,9 +562,9 @@ cc_test(
         "src/google/protobuf/stubs/strutil_unittest.cc",
         "src/google/protobuf/stubs/template_util_unittest.cc",
         "src/google/protobuf/stubs/time_test.cc",
-        "src/google/protobuf/stubs/type_traits_unittest.cc",
         "src/google/protobuf/text_format_unittest.cc",
         "src/google/protobuf/unknown_field_set_unittest.cc",
+        "src/google/protobuf/util/delimited_message_util_test.cc",
         "src/google/protobuf/util/field_comparator_test.cc",
         "src/google/protobuf/util/field_mask_util_test.cc",
         "src/google/protobuf/util/internal/default_value_objectwriter_test.cc",
@@ -541,6 +585,9 @@ cc_test(
         ":test_plugin",
     ] + glob([
         "src/google/protobuf/**/*",
+        # Files for csharp_bootstrap_unittest.cc.
+        "conformance/**/*",
+        "csharp/src/**/*",
     ]),
     includes = [
         "src/",
@@ -568,6 +615,10 @@ java_library(
     ]) + [
         ":gen_well_known_protos_java",
     ],
+    javacopts = select({
+       "//:jdk9": ["--add-modules=jdk.unsupported"],
+       "//conditions:default": ["-source 7", "-target 7"],
+    }),
     visibility = ["//visibility:public"],
 )
 
@@ -576,6 +627,7 @@ java_library(
     srcs = glob([
         "java/util/src/main/java/com/google/protobuf/util/*.java",
     ]),
+    javacopts = ["-source 7", "-target 7"],
     visibility = ["//visibility:public"],
     deps = [
         "protobuf_java",
@@ -592,6 +644,7 @@ py_library(
     name = "python_srcs",
     srcs = glob(
         [
+            "python/google/__init__.py",
             "python/google/protobuf/*.py",
             "python/google/protobuf/**/*.py",
         ],
@@ -640,6 +693,7 @@ cc_binary(
     linkstatic = 1,
     deps = [
         ":protobuf",
+        ":proto_api",
     ] + select({
         "//conditions:default": [],
         ":use_fast_cpp_protos": ["//external:python_headers"],
@@ -693,6 +747,7 @@ py_proto_library(
         ":python_srcs",
         "//external:six",
     ],
+    py_extra_srcs = glob(["python/**/__init__.py"]),
     srcs_version = "PY2AND3",
     visibility = ["//visibility:public"],
 )
@@ -781,11 +836,20 @@ internal_protobuf_py_tests(
     deps = [":python_tests"],
 )
 
+cc_library(
+    name = "proto_api",
+    hdrs = ["python/google/protobuf/proto_api.h"],
+    deps = [
+        "//external:python_headers",
+    ],
+)
+
 proto_lang_toolchain(
     name = "cc_toolchain",
     command_line = "--cpp_out=$(OUT)",
     runtime = ":protobuf",
     visibility = ["//visibility:public"],
+    blacklisted_protos = [":_internal_wkt_protos_genrule"],
 )
 
 proto_lang_toolchain(
@@ -794,3 +858,84 @@ proto_lang_toolchain(
     runtime = ":protobuf_java",
     visibility = ["//visibility:public"],
 )
+
+OBJC_HDRS = [
+    "objectivec/GPBArray.h",
+    "objectivec/GPBBootstrap.h",
+    "objectivec/GPBCodedInputStream.h",
+    "objectivec/GPBCodedOutputStream.h",
+    "objectivec/GPBDescriptor.h",
+    "objectivec/GPBDictionary.h",
+    "objectivec/GPBExtensionInternals.h",
+    "objectivec/GPBExtensionRegistry.h",
+    "objectivec/GPBMessage.h",
+    "objectivec/GPBProtocolBuffers.h",
+    "objectivec/GPBProtocolBuffers_RuntimeSupport.h",
+    "objectivec/GPBRootObject.h",
+    "objectivec/GPBRuntimeTypes.h",
+    "objectivec/GPBUnknownField.h",
+    "objectivec/GPBUnknownFieldSet.h",
+    "objectivec/GPBUtilities.h",
+    "objectivec/GPBWellKnownTypes.h",
+    "objectivec/GPBWireFormat.h",
+    "objectivec/google/protobuf/Any.pbobjc.h",
+    "objectivec/google/protobuf/Api.pbobjc.h",
+    "objectivec/google/protobuf/Duration.pbobjc.h",
+    "objectivec/google/protobuf/Empty.pbobjc.h",
+    "objectivec/google/protobuf/FieldMask.pbobjc.h",
+    "objectivec/google/protobuf/SourceContext.pbobjc.h",
+    "objectivec/google/protobuf/Struct.pbobjc.h",
+    "objectivec/google/protobuf/Timestamp.pbobjc.h",
+    "objectivec/google/protobuf/Type.pbobjc.h",
+    "objectivec/google/protobuf/Wrappers.pbobjc.h",
+]
+
+OBJC_PRIVATE_HDRS = [
+    "objectivec/GPBArray_PackagePrivate.h",
+    "objectivec/GPBCodedInputStream_PackagePrivate.h",
+    "objectivec/GPBCodedOutputStream_PackagePrivate.h",
+    "objectivec/GPBDescriptor_PackagePrivate.h",
+    "objectivec/GPBDictionary_PackagePrivate.h",
+    "objectivec/GPBMessage_PackagePrivate.h",
+    "objectivec/GPBRootObject_PackagePrivate.h",
+    "objectivec/GPBUnknownFieldSet_PackagePrivate.h",
+    "objectivec/GPBUnknownField_PackagePrivate.h",
+    "objectivec/GPBUtilities_PackagePrivate.h",
+]
+
+OBJC_SRCS = [
+    "objectivec/GPBArray.m",
+    "objectivec/GPBCodedInputStream.m",
+    "objectivec/GPBCodedOutputStream.m",
+    "objectivec/GPBDescriptor.m",
+    "objectivec/GPBDictionary.m",
+    "objectivec/GPBExtensionInternals.m",
+    "objectivec/GPBExtensionRegistry.m",
+    "objectivec/GPBMessage.m",
+    "objectivec/GPBRootObject.m",
+    "objectivec/GPBUnknownField.m",
+    "objectivec/GPBUnknownFieldSet.m",
+    "objectivec/GPBUtilities.m",
+    "objectivec/GPBWellKnownTypes.m",
+    "objectivec/GPBWireFormat.m",
+    "objectivec/google/protobuf/Any.pbobjc.m",
+    "objectivec/google/protobuf/Api.pbobjc.m",
+    "objectivec/google/protobuf/Duration.pbobjc.m",
+    "objectivec/google/protobuf/Empty.pbobjc.m",
+    "objectivec/google/protobuf/FieldMask.pbobjc.m",
+    "objectivec/google/protobuf/SourceContext.pbobjc.m",
+    "objectivec/google/protobuf/Struct.pbobjc.m",
+    "objectivec/google/protobuf/Timestamp.pbobjc.m",
+    "objectivec/google/protobuf/Type.pbobjc.m",
+    "objectivec/google/protobuf/Wrappers.pbobjc.m",
+]
+
+objc_library(
+    name = "objectivec",
+    hdrs = OBJC_HDRS + OBJC_PRIVATE_HDRS,
+    includes = [
+        "objectivec",
+    ],
+    non_arc_srcs = OBJC_SRCS,
+    visibility = ["//visibility:public"],
+)
diff --git a/CHANGES.txt b/CHANGES.txt
index 11645836..c7c42916 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,350 @@
+2017-12-20 version 3.5.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+  Planned Future Changes
+  * Make C++ implementation C++11 only: we plan to require C++11 to build
+    protobuf code starting from 3.6.0 release. Please join this github issue:
+    https://github.com/google/protobuf/issues/2780 to provide your feedback.
+
+  protoc
+  * Fixed a bug introduced in 3.5.0 and protoc in Windows now accepts non-ascii
+    characters in paths again.
+
+  C++
+  * Removed several usages of C++11 features in the code base.
+  * Fixed some compiler warnings.
+
+  PHP
+  * Fixed memory leak in C-extension implementation.
+  * Added discardUnknokwnFields API.
+  * Removed duplicatd typedef in C-extension headers.
+  * Avoided calling private php methods (timelib_update_ts).
+  * Fixed Any.php to use fully-qualified name for DescriptorPool.
+
+  Ruby
+  * Added Google_Protobuf_discard_unknown for discarding unknown fields in
+    messages.
+
+  C#
+  * Unknown fields are now preserved by default.
+  * Floating point values are now bitwise compared, affecting message equality
+    check and Contains() API in map and repeated fields.
+
+
+2017-11-13 version 3.5.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+  Planned Future Changes
+  * Make C++ implementation C++11 only: we plan to require C++11 to build
+    protobuf code starting from 3.6.0 release. Please join this github issue:
+    https://github.com/google/protobuf/issues/2780 to provide your feedback.
+
+  General
+  * Unknown fields are now preserved in proto3 for most of the language
+    implementations for proto3 by default. See the per-language section for
+    details.
+  * reserve keyword are now supported in enums
+
+  C++
+  * Proto3 messages are now preserving unknown fields by default. If you rely on
+    unknowns fields being dropped. Please use DiscardUnknownFields() explicitly.
+  * Deprecated the unsafe_arena_release_* and unsafe_arena_add_allocated_*
+    methods for string fields.
+  * Added move constructor and move assignment to RepeatedField,
+    RepeatedPtrField and google::protobuf::Any.
+  * Added perfect forwarding in Arena::CreateMessage
+  * In-progress experimental support for implicit weak fields with lite protos.
+    This feature allows the linker to strip out more unused messages and reduce
+    binary size.
+  * Various performance optimizations.
+
+  Java
+  * Proto3 messages are now preserving unknown fields by default. If you’d like
+    to drop unknown fields, please use the DiscardUnknownFieldsParser API. For
+    example:
+      Parser<Foo> parser = DiscardUnknownFieldsParser.wrap(Foo.parser());
+      Foo foo = parser.parseFrom(input);
+  * Added a new CodedInputStream decoder for Iterable<ByteBuffer> with direct
+    ByteBuffers.
+  * TextFormat now prints unknown length-delimited fields as messages if
+    possible.
+  * FieldMaskUtil.merge() no longer creates unnecessary empty messages when a
+    message field is unset in both source message and destination message.
+  * Various performance optimizations.
+
+  Python
+  * Proto3 messages are now preserving unknown fields by default. Use
+    message.DiscardUnknownFields() to drop unknown fields.
+  * Add FieldDescriptor.file in generated code.
+  * Add descriptor pool FindOneofByName in pure python.
+  * Change unknown enum values into unknown field set .
+  * Add more Python dict/list compatibility for Struct/ListValue.
+  * Add utf-8 support for text_format.Merge()/Parse().
+  * Support numeric unknown enum values for proto3 JSON format.
+  * Add warning for Unexpected end-group tag in cpp extension.
+
+  PHP
+  * Proto3 messages are now preserving unknown fields.
+  * Provide well known type messages in runtime.
+  * Add prefix ‘PB’ to generated class of reserved names.
+  * Fixed all conformance tests for encode/decode json in php runtime. C
+    extension needs more work.
+
+  Objective-C
+  * Fixed some issues around copying of messages with unknown fields and then
+    mutating the unknown fields in the copy.
+
+  C#
+  * Added unknown field support in JsonParser.
+  * Fixed oneof message field merge.
+  * Simplify parsing messages from array slices.
+
+  Ruby
+  * Unknown fields are now preserved by default.
+  * Fixed several bugs for segment fault.
+
+  Javascript
+  * Decoder can handle both paced and unpacked data no matter how the proto is
+    defined.
+  * Decoder now accept long varint for 32 bit integers.
+
+
+2017-08-14 version 3.4.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+  Planned Future Changes
+  * There are some changes that are not included in this release but are planned
+    for the near future
+      - Preserve unknown fields in proto3: We are going to bring unknown fields
+        back into proto3. In this release, some languages start to support
+        preserving unknown fields in proto3, controlled by flags/options. Some
+        languages also introduce explicit APIs to drop unknown fields for
+        migration. Please read the change log sections by languages for details.
+        For general timeline and plan:
+
+          https://docs.google.com/document/d/1KMRX-G91Aa-Y2FkEaHeeviLRRNblgIahbsk4wA14gRk/view
+
+        For issues and discussions:
+
+          https://github.com/google/protobuf/issues/272
+
+      - Make C++ implementation C++11 only: we plan to require C++11 to build
+        protobuf code starting from 3.5.0 or 3.6.0 release, after unknown fields
+        semantic changes are finished. Please join this
+        github issue:
+
+          https://github.com/google/protobuf/issues/2780
+
+        to provide your feedback.
+
+  General
+  * Extension ranges now accept options and are customizable.
+  * "reserve" keyword now supports “max” in field number ranges,
+    e.g.  reserve 1000 to max;
+
+  C++
+  * Proto3 messages are now able to preserve unknown fields. The default
+    behavior is still to drop unknowns, which will be flipped in a future
+    release. If you rely on unknowns fields being dropped. Please use
+    Message::DiscardUnknownFields() explicitly.
+  * Packable proto3 fields are now packed by default in serialization.
+  * Following C++11 features are introduced when C++11 is available:
+      - move-constructor and move-assignment are introduced to messages
+      - Repeated fields constructor now takes std::initializer_list
+      - rvalue setters are introduced for string fields
+  * Experimental Table-Driven parsing and serialization available to test. To
+    enable it, pass in table_driven_parsing table_driven_serialization protoc
+    generator flags for C++
+
+      $ protoc --cpp_out=table_driven_parsing,table_driven_serialization:./ \
+        test.proto
+
+  * lite generator parameter supported by the generator. Once set, all generated
+    files, use lite runtime regardless of the optimizer_for setting in the
+    .proto file.
+  * Various optimizations to make C++ code more performant on PowerPC platform
+  * Fixed maps data corruption when the maps are modified by both reflection API
+    and generated API.
+  * Deterministic serialization on maps reflection now uses stable sort.
+  * file() accessors are introduced to various *Descriptor classes to make
+    writing template function easier.
+  * ByteSize() and SpaceUsed() are deprecated.Use ByteSizeLong() and
+    SpaceUsedLong() instead
+  * Consistent hash function is used for maps in DEBUG and NDEBUG build.
+  * "using namespace std" is removed from stubs/common.h
+  * Various performance optimizations and bug fixes
+
+  Java
+  * Introduced new parser API DiscardUnknownFieldsParser in preparation of
+    proto3 unknown fields preservation change. Users who want to drop unknown
+    fields should migrate to use this new parser API. For example:
+
+      Parser<Foo> parser = DiscardUnknownFieldsParser.wrap(Foo.parser());
+      Foo foo = parser.parseFrom(input);
+
+  * Introduced new TextFormat API printUnicodeFieldValue() that prints field
+    value without escaping unicode characters.
+  * Added Durations.compare(Duration, Duration) and
+    Timestamps.compare(Timestamp, Timestamp).
+  * JsonFormat now accepts base64url encoded bytes fields.
+  * Optimized CodedInputStream to do less copies when parsing large bytes
+    fields.
+  * Optimized TextFormat to allocate less memory when printing.
+
+  Python
+  * SerializeToString API is changed to SerializeToString(self, **kwargs),
+    deterministic parameter is accepted for deterministic serialization.
+  * Added sort_keys parameter in json format to make the output deterministic.
+  * Added indent parameter in json format.
+  * Added extension support in json format.
+  * Added __repr__ support for repeated field in cpp implementation.
+  * Added file in FieldDescriptor.
+  * Added pretty-print filter to text format.
+  * Services and method descriptors are always printed even if generic_service
+    option is turned off.
+  * Note: AppEngine 2.5 is deprecated on June 2017 that AppEngine 2.5 will
+    never update protobuf runtime. Users who depend on AppEngine 2.5 should use
+    old protoc.
+
+  PHP
+  * Support PHP generic services. Specify file option php_generic_service=true
+    to enable generating service interface.
+  * Message, repeated and map fields setters take value instead of reference.
+  * Added map iterator in c extension.
+  * Support json  encode/decode.
+  * Added more type info in getter/setter phpdoc
+  * Fixed the problem that c extension and php implementation cannot be used
+    together.
+  * Added file option php_namespace to use custom php namespace instead of
+    package.
+  * Added fluent setter.
+  * Added descriptor API in runtime for custom encode/decode.
+  * Various bug fixes.
+
+  Objective-C
+  * Fix for GPBExtensionRegistry copying and add tests.
+  * Optimize GPBDictionary.m codegen to reduce size of overall library by 46K
+    per architecture.
+  * Fix some cases of reading of 64bit map values.
+  * Properly error on a tag with field number zero.
+  * Preserve unknown fields in proto3 syntax files.
+  * Document the exceptions on some of the writing apis.
+
+  C#
+  * Implemented IReadOnlyDictionary<K,V> in MapField<K,V>
+  * Added TryUnpack method for Any message in addition to Unpack.
+  * Converted C# projects to MSBuild (csproj) format.
+
+  Ruby
+  * Several bug fixes.
+
+  Javascript
+  * Added support of field option js_type. Now one can specify the JS type of a
+    64-bit integer field to be string in the generated code by adding option
+    [jstype = JS_STRING] on the field.
+
+2017-04-05 version 3.3.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+  Planned Future Changes
+  * There are some changes that are not included in this release but are
+    planned for the near future:
+      - Preserve unknown fields in proto3: please read this doc:
+
+          https://docs.google.com/document/d/1KMRX-G91Aa-Y2FkEaHeeviLRRNblgIahbsk4wA14gRk/view
+
+        for the timeline and follow up this github issue:
+
+          https://github.com/google/protobuf/issues/272
+
+        for discussion.
+      - Make C++ implementation C++11 only: we plan to require C++11 to build
+        protobuf code starting from 3.4.0 or 3.5.0 release. Please join this
+        github issue:
+
+          https://github.com/google/protobuf/issues/2780
+
+        to provide your feedback.
+
+  C++
+  * Fixed map fields serialization of DynamicMessage to correctly serialize
+    both key and value regardless of their presence.
+  * Parser now rejects field number 0 correctly.
+  * New API Message::SpaceUsedLong() that’s equivalent to
+    Message::SpaceUsed() but returns the value in size_t.
+  * JSON support
+    - New flag always_print_enums_as_ints in JsonPrintOptions.
+    - New flag preserve_proto_field_names in JsonPrintOptions. It will instruct
+      the JSON printer to use the original field name declared in the .proto
+      file instead of converting them to lowerCamelCase when printing JSON.
+    - JsonPrintOptions.always_print_primtive_fields now works for oneof message
+      fields.
+    - Fixed a bug that doesn’t allow different fields to set the same json_name
+      value.
+    - Fixed a performance bug that causes excessive memory copy when printing
+      large messages.
+  * Various performance optimizations.
+
+  Java
+  * Map field setters eagerly validate inputs and throw NullPointerExceptions
+    as appropriate.
+  * Added ByteBuffer overloads to the generated parsing methods and the Parser
+    interface.
+  * proto3 enum's getNumber() method now throws on UNRECOGNIZED values.
+  * Output of JsonFormat is now locale independent.
+
+  Python
+  * Added FindServiceByName() in the pure-Python DescriptorPool. This works only
+    for descriptors added with DescriptorPool.Add(). Generated descriptor_pool
+    does not support this yet.
+  * Added a descriptor_pool parameter for parsing Any in text_format.Parse().
+  * descriptor_pool.FindFileContainingSymbol() now is able to find nested
+    extensions.
+  * Extending empty [] to repeated field now sets parent message presence.
+
+  PHP
+  * Added file option php_class_prefix. The prefix will be prepended to all
+    generated classes defined in the file.
+  * When encoding, negative int32 values are sign-extended to int64.
+  * Repeated/Map field setter accepts a regular PHP array. Type checking is
+    done on the array elements.
+  * encode/decode are renamed to serializeToString/mergeFromString.
+  * Added mergeFrom, clear method on Message.
+  * Fixed a bug that oneof accessor didn’t return the field name that is
+    actually set.
+  * C extension now works with php7.
+  * This is the first GA release of PHP. We guarantee that old generated code
+    can always work with new runtime and new generated code.
+
+  Objective-C
+  * Fixed help for GPBTimestamp for dates before the epoch that contain
+    fractional seconds.
+  * Added GPBMessageDropUnknownFieldsRecursively() to remove unknowns from a
+    message and any sub messages.
+  * Addressed a threading race in extension registration/lookup.
+  * Increased the max message parsing depth to 100 to match the other languages.
+  * Removed some use of dispatch_once in favor of atomic compare/set since it
+    needs to be heap based.
+  * Fixes for new Xcode 8.3 warnings.
+
+  C#
+  * Fixed MapField.Values.CopyTo, which would throw an exception unnecessarily
+    if provided exactly the right size of array to copy to.
+  * Fixed enum JSON formatting when multiple names mapped to the same numeric
+    value.
+  * Added JSON formatting option to format enums as integers.
+  * Modified RepeatedField<T> to implement IReadOnlyList<T>.
+  * Introduced the start of custom option handling; it's not as pleasant as it
+    might be, but the information is at least present. We expect to extend code
+    generation to improve this in the future.
+  * Introduced ByteString.FromStream and ByteString.FromStreamAsync to
+    efficiently create a ByteString from a stream.
+  * Added whole-message deprecation, which decorates the class with [Obsolete].
+
+  Ruby
+  * Fixed Message#to_h for messages with map fields.
+  * Fixed memcpy() in binary gems to work for old glibc, without breaking the
+    build for non-glibc libc’s like musl.
+
+  Javascript
+  * Added compatibility tests for version 3.0.0.
+  * Added conformance tests.
+  * Fixed serialization of extensions: we need to emit a value even if it is
+    falsy (like the number 0).
+  * Use closurebuilder.py in favor of calcdeps.py for compiling JavaScript.
+
 2017-01-23 version 3.2.0 (C++/Java/Python/PHP/Ruby/Objective-C/C#/JavaScript/Lite)
   General
   * Added protoc version number to protoc plugin protocol. It can be used by
diff --git a/LICENSE b/LICENSE
index f028c823..19b305b0 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,14 +1,4 @@
-This license applies to all parts of Protocol Buffers except the following:
-
-  - Atomicops support for generic gcc, located in
-    src/google/protobuf/stubs/atomicops_internals_generic_gcc.h.
-    This file is copyrighted by Red Hat Inc.
-
-  - Atomicops support for AIX/POWER, located in
-    src/google/protobuf/stubs/atomicops_internals_power.h.
-    This file is copyrighted by Bloomberg Finance LP.
-
-Copyright 2014, Google Inc.  All rights reserved.
+Copyright 2008 Google Inc.  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
diff --git a/Makefile.am b/Makefile.am
index c8f7f696..ac87e8a3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -8,8 +8,8 @@ AUTOMAKE_OPTIONS = foreign
 # the right time.
 SUBDIRS = . src
 
-# Always include gmock in distributions.
-DIST_SUBDIRS = $(subdirs) src conformance benchmarks
+# Always include third_party directories in distributions.
+DIST_SUBDIRS = src conformance benchmarks third_party/googletest
 
 # Build gmock before we build protobuf tests.  We don't add gmock to SUBDIRS
 # because then "make check" would also build and run all of gmock's own tests,
@@ -18,8 +18,8 @@ DIST_SUBDIRS = $(subdirs) src conformance benchmarks
 # the installed version of gmock if there is one.
 check-local:
 	@echo "Making lib/libgmock.a lib/libgmock_main.a in gmock"
-	@cd gmock && $(MAKE) $(AM_MAKEFLAGS) lib/libgmock.la lib/libgmock_main.la
-	@cd gmock/gtest && $(MAKE) $(AM_MAKEFLAGS) lib/libgtest.la lib/libgtest_main.la
+	@cd third_party/googletest/googletest && $(MAKE) $(AM_MAKEFLAGS) lib/libgtest.la lib/libgtest_main.la
+	@cd third_party/googletest/googlemock && $(MAKE) $(AM_MAKEFLAGS) lib/libgmock.la lib/libgmock_main.la
 
 # We would like to clean gmock when "make clean" is invoked.  But we have to
 # be careful because clean-local is also invoked during "make distclean", but
@@ -28,9 +28,9 @@ check-local:
 # cd to the directory again and "make clean" it will fail.  So, check that the
 # Makefile exists before recursing.
 clean-local:
-	@if test -e gmock/Makefile; then \
-	  echo "Making clean in gmock"; \
-	  cd gmock && $(MAKE) $(AM_MAKEFLAGS) clean; \
+	@if test -e third_party/googletest/Makefile; then \
+	  echo "Making clean in googletest"; \
+	  cd third_party/googletest && $(MAKE) $(AM_MAKEFLAGS) clean; \
 	fi; \
 	if test -e conformance/Makefile; then \
 	  echo "Making clean in conformance"; \
@@ -57,30 +57,34 @@ csharp_EXTRA_DIST=                                                           \
   csharp/build_tools.sh                                                      \
   csharp/buildall.sh                                                         \
   csharp/generate_protos.sh                                                  \
+  csharp/global.json                                                         \
   csharp/keys/Google.Protobuf.public.snk                                     \
   csharp/keys/Google.Protobuf.snk                                            \
   csharp/keys/README.md                                                      \
+  csharp/protos/README.md                                                    \
+  csharp/protos/map_unittest_proto3.proto                                    \
   csharp/protos/unittest_custom_options_proto3.proto                         \
+  csharp/protos/unittest_import_public_proto3.proto                          \
+  csharp/protos/unittest_import_proto3.proto                                 \
   csharp/protos/unittest_issues.proto                                        \
+  csharp/protos/unittest_proto3.proto                                        \
   csharp/src/AddressBook/AddPerson.cs                                        \
   csharp/src/AddressBook/Addressbook.cs                                      \
-  csharp/src/AddressBook/AddressBook.xproj                                   \
+  csharp/src/AddressBook/AddressBook.csproj                                  \
   csharp/src/AddressBook/ListPeople.cs                                       \
   csharp/src/AddressBook/Program.cs                                          \
   csharp/src/AddressBook/SampleUsage.cs                                      \
-  csharp/src/AddressBook/project.json                                        \
   csharp/src/Google.Protobuf.Conformance/Conformance.cs                      \
-  csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj   \
+  csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj  \
   csharp/src/Google.Protobuf.Conformance/Program.cs                          \
-  csharp/src/Google.Protobuf.Conformance/project.json                        \
-  csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj         \
+  csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj        \
   csharp/src/Google.Protobuf.JsonDump/Program.cs                             \
-  csharp/src/Google.Protobuf.JsonDump/project.json                           \
   csharp/src/Google.Protobuf.Test/ByteStringTest.cs                          \
   csharp/src/Google.Protobuf.Test/CodedInputStreamExtensions.cs              \
   csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs                    \
   csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs                   \
   csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs                \
+  csharp/src/Google.Protobuf.Test/Collections/ProtobufEqualityComparersTest.cs \
   csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs           \
   csharp/src/Google.Protobuf.Test/Compatibility/PropertyInfoExtensionsTest.cs \
   csharp/src/Google.Protobuf.Test/Compatibility/StreamExtensionsTest.cs      \
@@ -89,7 +93,7 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf.Test/EqualityTester.cs                          \
   csharp/src/Google.Protobuf.Test/FieldCodecTest.cs                          \
   csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs                    \
-  csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj                 \
+  csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj                \
   csharp/src/Google.Protobuf.Test/IssuesTest.cs                              \
   csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs                       \
   csharp/src/Google.Protobuf.Test/JsonParserTest.cs                          \
@@ -100,6 +104,7 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf.Test/Reflection/TypeRegistryTest.cs             \
   csharp/src/Google.Protobuf.Test/SampleEnum.cs                              \
   csharp/src/Google.Protobuf.Test/SampleMessages.cs                          \
+  csharp/src/Google.Protobuf.Test/SampleNaNs.cs                              \
   csharp/src/Google.Protobuf.Test/TestCornerCases.cs                         \
   csharp/src/Google.Protobuf.Test/TestProtos/ForeignMessagePartial.cs        \
   csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs            \
@@ -115,22 +120,25 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs            \
   csharp/src/Google.Protobuf.Test/WellKnownTypes/TimestampTest.cs            \
   csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs             \
-  csharp/src/Google.Protobuf.Test/project.json                               \
+  csharp/src/Google.Protobuf.Test/UnknownFieldSetTest.cs                     \
   csharp/src/Google.Protobuf.sln                                             \
   csharp/src/Google.Protobuf/ByteArray.cs                                    \
   csharp/src/Google.Protobuf/ByteString.cs                                   \
   csharp/src/Google.Protobuf/CodedInputStream.cs                             \
   csharp/src/Google.Protobuf/CodedOutputStream.ComputeSize.cs                \
   csharp/src/Google.Protobuf/CodedOutputStream.cs                            \
+  csharp/src/Google.Protobuf/Collections/Lists.cs                            \
   csharp/src/Google.Protobuf/Collections/MapField.cs                         \
+  csharp/src/Google.Protobuf/Collections/ProtobufEqualityComparers.cs        \
   csharp/src/Google.Protobuf/Collections/ReadOnlyDictionary.cs               \
   csharp/src/Google.Protobuf/Collections/RepeatedField.cs                    \
+  csharp/src/Google.Protobuf/Compatibility/MethodInfoExtensions.cs           \
   csharp/src/Google.Protobuf/Compatibility/PropertyInfoExtensions.cs         \
   csharp/src/Google.Protobuf/Compatibility/StreamExtensions.cs               \
   csharp/src/Google.Protobuf/Compatibility/TypeExtensions.cs                 \
   csharp/src/Google.Protobuf/FieldCodec.cs                                   \
   csharp/src/Google.Protobuf/FrameworkPortability.cs                         \
-  csharp/src/Google.Protobuf/Google.Protobuf.xproj                           \
+  csharp/src/Google.Protobuf/Google.Protobuf.csproj                          \
   csharp/src/Google.Protobuf/ICustomDiagnosticMessage.cs                     \
   csharp/src/Google.Protobuf/IDeepCloneable.cs                               \
   csharp/src/Google.Protobuf/IMessage.cs                                     \
@@ -191,9 +199,8 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs                      \
   csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs               \
   csharp/src/Google.Protobuf/WireFormat.cs                                   \
-  csharp/src/Google.Protobuf/project.json                                    \
-  csharp/src/global.json                                                     \
-  csharp/src/packages/repositories.config
+  csharp/src/Google.Protobuf/UnknownField.cs                                 \
+  csharp/src/Google.Protobuf/UnknownFieldSet.cs
 
 java_EXTRA_DIST=                                                                   \
   java/README.md                                                                   \
@@ -204,6 +211,7 @@ java_EXTRA_DIST=
   java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java             \
   java/core/src/main/java/com/google/protobuf/AbstractParser.java                  \
   java/core/src/main/java/com/google/protobuf/AbstractProtobufList.java            \
+  java/core/src/main/java/com/google/protobuf/Android.java                         \
   java/core/src/main/java/com/google/protobuf/BlockingRpcChannel.java              \
   java/core/src/main/java/com/google/protobuf/BlockingService.java                 \
   java/core/src/main/java/com/google/protobuf/BooleanArrayList.java                \
@@ -212,6 +220,7 @@ java_EXTRA_DIST=
   java/core/src/main/java/com/google/protobuf/ByteString.java                      \
   java/core/src/main/java/com/google/protobuf/CodedInputStream.java                \
   java/core/src/main/java/com/google/protobuf/CodedOutputStream.java               \
+  java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java      \
   java/core/src/main/java/com/google/protobuf/Descriptors.java                     \
   java/core/src/main/java/com/google/protobuf/DoubleArrayList.java                 \
   java/core/src/main/java/com/google/protobuf/DynamicMessage.java                  \
@@ -229,6 +238,7 @@ java_EXTRA_DIST=
   java/core/src/main/java/com/google/protobuf/IntArrayList.java                    \
   java/core/src/main/java/com/google/protobuf/Internal.java                        \
   java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java  \
+  java/core/src/main/java/com/google/protobuf/IterableByteBufferInputStream.java   \
   java/core/src/main/java/com/google/protobuf/LazyField.java                       \
   java/core/src/main/java/com/google/protobuf/LazyFieldLite.java                   \
   java/core/src/main/java/com/google/protobuf/LazyStringArrayList.java             \
@@ -247,6 +257,7 @@ java_EXTRA_DIST=
   java/core/src/main/java/com/google/protobuf/MutabilityOracle.java                \
   java/core/src/main/java/com/google/protobuf/NioByteString.java                   \
   java/core/src/main/java/com/google/protobuf/Parser.java                          \
+  java/core/src/main/java/com/google/protobuf/PrimitiveNonBoxingCollection.java    \
   java/core/src/main/java/com/google/protobuf/ProtobufArrayList.java               \
   java/core/src/main/java/com/google/protobuf/ProtocolMessageEnum.java             \
   java/core/src/main/java/com/google/protobuf/ProtocolStringList.java              \
@@ -283,8 +294,10 @@ java_EXTRA_DIST=
   java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java                   \
   java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java            \
   java/core/src/test/java/com/google/protobuf/CodedOutputStreamTest.java           \
+  java/core/src/test/java/com/google/protobuf/DecodeUtf8Test.java                  \
   java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java             \
   java/core/src/test/java/com/google/protobuf/DescriptorsTest.java                 \
+  java/core/src/test/java/com/google/protobuf/DiscardUnknownFieldsTest.java        \
   java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java             \
   java/core/src/test/java/com/google/protobuf/DynamicMessageTest.java              \
   java/core/src/test/java/com/google/protobuf/EnumTest.java                        \
@@ -321,6 +334,7 @@ java_EXTRA_DIST=
   java/core/src/test/java/com/google/protobuf/SingleFieldBuilderV3Test.java        \
   java/core/src/test/java/com/google/protobuf/SmallSortedMapTest.java              \
   java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java              \
+  java/core/src/test/java/com/google/protobuf/TestBadIdentifiersLite.java          \
   java/core/src/test/java/com/google/protobuf/TestUtil.java                        \
   java/core/src/test/java/com/google/protobuf/TestUtilLite.java                    \
   java/core/src/test/java/com/google/protobuf/TextFormatParseInfoTreeTest.java     \
@@ -333,12 +347,14 @@ java_EXTRA_DIST=
   java/core/src/test/java/com/google/protobuf/WellKnownTypesTest.java              \
   java/core/src/test/java/com/google/protobuf/WireFormatTest.java                  \
   java/core/src/test/proto/com/google/protobuf/any_test.proto                      \
+  java/core/src/test/proto/com/google/protobuf/deprecated_file.proto               \
   java/core/src/test/proto/com/google/protobuf/field_presence_test.proto           \
   java/core/src/test/proto/com/google/protobuf/lazy_fields_lite.proto              \
   java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto          \
   java/core/src/test/proto/com/google/protobuf/map_for_proto2_lite_test.proto      \
   java/core/src/test/proto/com/google/protobuf/map_for_proto2_test.proto           \
   java/core/src/test/proto/com/google/protobuf/map_initialization_order_test.proto \
+  java/core/src/test/proto/com/google/protobuf/map_lite_test.proto                 \
   java/core/src/test/proto/com/google/protobuf/map_test.proto                      \
   java/core/src/test/proto/com/google/protobuf/multiple_files_test.proto           \
   java/core/src/test/proto/com/google/protobuf/nested_builders_test.proto          \
@@ -354,9 +370,7 @@ java_EXTRA_DIST=
   java/core/src/test/proto/com/google/protobuf/test_check_utf8_size.proto          \
   java/core/src/test/proto/com/google/protobuf/test_custom_options.proto           \
   java/core/src/test/proto/com/google/protobuf/test_extra_interfaces.proto         \
-  java/lite/generate-sources-build.xml                                             \
-  java/lite/generate-test-sources-build.xml                                        \
-  java/lite/pom.xml                                                                \
+  java/lite.md                                                                     \
   java/pom.xml                                                                     \
   java/util/pom.xml                                                                \
   java/util/src/main/java/com/google/protobuf/util/Durations.java                  \
@@ -371,45 +385,6 @@ java_EXTRA_DIST=
   java/util/src/test/java/com/google/protobuf/util/TimeUtilTest.java               \
   java/util/src/test/proto/com/google/protobuf/util/json_test.proto
 
-javanano_EXTRA_DIST=                                                                      \
-  javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java          \
-  javanano/src/main/java/com/google/protobuf/nano/FieldData.java                          \
-  javanano/src/main/java/com/google/protobuf/nano/FieldArray.java                         \
-  javanano/src/main/java/com/google/protobuf/nano/WireFormatNano.java                     \
-  javanano/src/main/java/com/google/protobuf/nano/Extension.java                          \
-  javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java           \
-  javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java                   \
-  javanano/src/main/java/com/google/protobuf/nano/MessageNano.java                        \
-  javanano/src/main/java/com/google/protobuf/nano/InternalNano.java                       \
-  javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java \
-  javanano/src/main/java/com/google/protobuf/nano/MapFactories.java                       \
-  javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java              \
-  javanano/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java                 \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto           \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto          \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto     \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto  \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_has_nano.proto                 \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_nano.proto                     \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto  \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_single_nano.proto              \
-  javanano/src/test/java/com/google/protobuf/nano/NanoTest.java                           \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto              \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto              \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto      \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto           \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto  \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto  \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto           \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto    \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto       \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto          \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto            \
-  javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto \
-  javanano/src/test/java/com/google/protobuf/nano/map_test.proto                          \
-  javanano/README.md                                                                      \
-  javanano/pom.xml
-
 objectivec_EXTRA_DIST=                                                       \
   objectivec/DevTools/check_version_stamps.sh                                \
   objectivec/DevTools/compile_testing_protos.sh                              \
@@ -482,11 +457,13 @@ objectivec_EXTRA_DIST=                                                       \
   objectivec/GPBWireFormat.m                                                 \
   objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj                   \
   objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/contents.xcworkspacedata \
+  objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist \
   objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings \
   objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme \
   objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme \
   objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj                   \
   objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/contents.xcworkspacedata \
+  objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist \
   objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings \
   objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme \
   objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme \
@@ -524,6 +501,31 @@ objectivec_EXTRA_DIST=                                                       \
   objectivec/Tests/GPBArrayTests.m                                           \
   objectivec/Tests/GPBCodedInputStreamTests.m                                \
   objectivec/Tests/GPBCodedOuputStreamTests.m                                \
+  objectivec/Tests/GPBCompileTest01.m                                        \
+  objectivec/Tests/GPBCompileTest02.m                                        \
+  objectivec/Tests/GPBCompileTest03.m                                        \
+  objectivec/Tests/GPBCompileTest04.m                                        \
+  objectivec/Tests/GPBCompileTest05.m                                        \
+  objectivec/Tests/GPBCompileTest06.m                                        \
+  objectivec/Tests/GPBCompileTest07.m                                        \
+  objectivec/Tests/GPBCompileTest08.m                                        \
+  objectivec/Tests/GPBCompileTest09.m                                        \
+  objectivec/Tests/GPBCompileTest10.m                                        \
+  objectivec/Tests/GPBCompileTest11.m                                        \
+  objectivec/Tests/GPBCompileTest12.m                                        \
+  objectivec/Tests/GPBCompileTest13.m                                        \
+  objectivec/Tests/GPBCompileTest14.m                                        \
+  objectivec/Tests/GPBCompileTest15.m                                        \
+  objectivec/Tests/GPBCompileTest16.m                                        \
+  objectivec/Tests/GPBCompileTest17.m                                        \
+  objectivec/Tests/GPBCompileTest18.m                                        \
+  objectivec/Tests/GPBCompileTest19.m                                        \
+  objectivec/Tests/GPBCompileTest20.m                                        \
+  objectivec/Tests/GPBCompileTest21.m                                        \
+  objectivec/Tests/GPBCompileTest22.m                                        \
+  objectivec/Tests/GPBCompileTest23.m                                        \
+  objectivec/Tests/GPBCompileTest24.m                                        \
+  objectivec/Tests/GPBCompileTest25.m                                        \
   objectivec/Tests/GPBConcurrencyTests.m                                     \
   objectivec/Tests/GPBDescriptorTests.m                                      \
   objectivec/Tests/GPBDictionaryTests+Bool.m                                 \
@@ -534,6 +536,7 @@ objectivec_EXTRA_DIST=                                                       \
   objectivec/Tests/GPBDictionaryTests+UInt64.m                               \
   objectivec/Tests/GPBDictionaryTests.m                                      \
   objectivec/Tests/GPBDictionaryTests.pddm                                   \
+  objectivec/Tests/GPBExtensionRegistryTest.m                                \
   objectivec/Tests/GPBMessageTests+Merge.m                                   \
   objectivec/Tests/GPBMessageTests+Runtime.m                                 \
   objectivec/Tests/GPBMessageTests+Serialization.m                           \
@@ -549,20 +552,6 @@ objectivec_EXTRA_DIST=                                                       \
   objectivec/Tests/GPBUtilitiesTests.m                                       \
   objectivec/Tests/GPBWellKnownTypesTest.m                                   \
   objectivec/Tests/GPBWireFormatTests.m                                      \
-  objectivec/Tests/iOSTestHarness/AppDelegate.m                              \
-  objectivec/Tests/iOSTestHarness/en.lproj/InfoPlist.strings                 \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/Contents.json      \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6.png          \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6_2x.png       \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7.png          \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7_2x.png       \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6.png        \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6_2x.png     \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_2x.png     \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_3x.png     \
-  objectivec/Tests/iOSTestHarness/Images.xcassets/LaunchImage.launchimage/Contents.json \
-  objectivec/Tests/iOSTestHarness/Info.plist                                  \
-  objectivec/Tests/iOSTestHarness/LaunchScreen.xib                            \
   objectivec/Tests/text_format_map_unittest_data.txt                          \
   objectivec/Tests/text_format_unittest_data.txt                              \
   objectivec/Tests/unittest_cycle.proto                                       \
@@ -584,93 +573,178 @@ objectivec_EXTRA_DIST=                                                       \
   Protobuf.podspec
 
 php_EXTRA_DIST=                                                       \
-  php/src/phpdoc.dist.xml                                             \
+  composer.json                                                       \
+  php/README.md                                                       \
+  php/composer.json                                                   \
+  php/ext/google/protobuf/array.c                                     \
+  php/ext/google/protobuf/config.m4                                   \
+  php/ext/google/protobuf/def.c                                       \
+  php/ext/google/protobuf/encode_decode.c                             \
+  php/ext/google/protobuf/map.c                                       \
+  php/ext/google/protobuf/message.c                                   \
+  php/ext/google/protobuf/package.xml                                 \
+  php/ext/google/protobuf/protobuf.c                                  \
+  php/ext/google/protobuf/protobuf.h                                  \
+  php/ext/google/protobuf/storage.c                                   \
+  php/ext/google/protobuf/type_check.c                                \
+  php/ext/google/protobuf/upb.c                                       \
+  php/ext/google/protobuf/upb.h                                       \
+  php/ext/google/protobuf/utf8.c                                      \
+  php/ext/google/protobuf/utf8.h                                      \
+  php/generate_descriptor_protos.sh                                   \
+  php/phpunit.xml                                                     \
+  php/src/GPBMetadata/Google/Protobuf/Any.php                         \
+  php/src/GPBMetadata/Google/Protobuf/Api.php                         \
+  php/src/GPBMetadata/Google/Protobuf/Duration.php                    \
+  php/src/GPBMetadata/Google/Protobuf/FieldMask.php                   \
+  php/src/GPBMetadata/Google/Protobuf/GPBEmpty.php                    \
+  php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php         \
+  php/src/GPBMetadata/Google/Protobuf/SourceContext.php               \
+  php/src/GPBMetadata/Google/Protobuf/Struct.php                      \
+  php/src/GPBMetadata/Google/Protobuf/Timestamp.php                   \
+  php/src/GPBMetadata/Google/Protobuf/Type.php                        \
+  php/src/GPBMetadata/Google/Protobuf/Wrappers.php                    \
+  php/src/Google/Protobuf/Any.php                                     \
+  php/src/Google/Protobuf/Api.php                                     \
+  php/src/Google/Protobuf/BoolValue.php                               \
+  php/src/Google/Protobuf/BytesValue.php                              \
+  php/src/Google/Protobuf/Descriptor.php                              \
+  php/src/Google/Protobuf/DescriptorPool.php                          \
+  php/src/Google/Protobuf/DoubleValue.php                             \
+  php/src/Google/Protobuf/Duration.php                                \
+  php/src/Google/Protobuf/Enum.php                                    \
+  php/src/Google/Protobuf/EnumDescriptor.php                          \
+  php/src/Google/Protobuf/EnumValue.php                               \
+  php/src/Google/Protobuf/EnumValueDescriptor.php                     \
+  php/src/Google/Protobuf/Field.php                                   \
+  php/src/Google/Protobuf/FieldDescriptor.php                         \
+  php/src/Google/Protobuf/FieldMask.php                               \
+  php/src/Google/Protobuf/Field/Cardinality.php                       \
+  php/src/Google/Protobuf/Field_Cardinality.php                       \
+  php/src/Google/Protobuf/Field/Kind.php                              \
+  php/src/Google/Protobuf/Field_Kind.php                              \
+  php/src/Google/Protobuf/FloatValue.php                              \
+  php/src/Google/Protobuf/GPBEmpty.php                                \
+  php/src/Google/Protobuf/Int32Value.php                              \
+  php/src/Google/Protobuf/Int64Value.php                              \
+  php/src/Google/Protobuf/Internal/CodedInputStream.php               \
+  php/src/Google/Protobuf/Internal/CodedOutputStream.php              \
+  php/src/Google/Protobuf/Internal/Descriptor.php                     \
   php/src/Google/Protobuf/Internal/DescriptorPool.php                 \
-  php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php              \
-  php/src/Google/Protobuf/Internal/OneofField.php                     \
-  php/src/Google/Protobuf/Internal/MessageOptions.php                 \
+  php/src/Google/Protobuf/Internal/DescriptorProto.php                \
+  php/src/Google/Protobuf/Internal/DescriptorProto/ExtensionRange.php \
+  php/src/Google/Protobuf/Internal/DescriptorProto/ReservedRange.php  \
+  php/src/Google/Protobuf/Internal/EnumBuilderContext.php             \
+  php/src/Google/Protobuf/Internal/EnumDescriptor.php                 \
+  php/src/Google/Protobuf/Internal/EnumDescriptorProto.php            \
+  php/src/Google/Protobuf/Internal/EnumDescriptorProto/EnumReservedRange.php \
+  php/src/Google/Protobuf/Internal/EnumOptions.php                    \
+  php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php       \
+  php/src/Google/Protobuf/Internal/EnumValueOptions.php               \
+  php/src/Google/Protobuf/Internal/ExtensionRangeOptions.php          \
+  php/src/Google/Protobuf/Internal/FieldDescriptorProto.php           \
+  php/src/Google/Protobuf/Internal/FieldDescriptor.php                \
+  php/src/Google/Protobuf/Internal/FieldDescriptorProto.php           \
+  php/src/Google/Protobuf/Internal/FieldDescriptorProto/Label.php     \
+  php/src/Google/Protobuf/Internal/FieldDescriptorProto/Type.php      \
+  php/src/Google/Protobuf/Internal/FieldOptions.php                   \
+  php/src/Google/Protobuf/Internal/FieldOptions/CType.php             \
+  php/src/Google/Protobuf/Internal/FieldOptions/JSType.php            \
+  php/src/Google/Protobuf/Internal/FileDescriptor.php                 \
   php/src/Google/Protobuf/Internal/FileDescriptorProto.php            \
+  php/src/Google/Protobuf/Internal/FileDescriptorSet.php              \
+  php/src/Google/Protobuf/Internal/FileOptions.php                    \
+  php/src/Google/Protobuf/Internal/FileOptions/OptimizeMode.php       \
+  php/src/Google/Protobuf/Internal/GPBDecodeException.php             \
+  php/src/Google/Protobuf/Internal/GPBJsonWire.php                    \
+  php/src/Google/Protobuf/Internal/GPBLabel.php                       \
+  php/src/Google/Protobuf/Internal/GPBType.php                        \
+  php/src/Google/Protobuf/Internal/GPBUtil.php                        \
+  php/src/Google/Protobuf/Internal/GPBWire.php                        \
+  php/src/Google/Protobuf/Internal/GPBWireType.php                    \
+  php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php              \
+  php/src/Google/Protobuf/Internal/GeneratedCodeInfo/Annotation.php   \
+  php/src/Google/Protobuf/Internal/GetPublicDescriptorTrait.php       \
+  php/src/Google/Protobuf/Internal/HasPublicDescriptorTrait.php       \
   php/src/Google/Protobuf/Internal/MapEntry.php                       \
-  php/src/Google/Protobuf/Internal/FieldDescriptorProto.php           \
-  php/src/Google/Protobuf/Internal/InputStream.php                    \
-  php/src/Google/Protobuf/Internal/UninterpretedOption.php            \
-  php/src/Google/Protobuf/Internal/ServiceOptions.php                 \
-  php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php \
-  php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php         \
-  php/src/Google/Protobuf/Internal/OneofDescriptorProto.php           \
-  php/src/Google/Protobuf/Internal/UninterpretedOption_NamePart.php   \
-  php/src/Google/Protobuf/Internal/OutputStream.php                   \
-  php/src/Google/Protobuf/Internal/MessageBuilderContext.php          \
-  php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php       \
-  php/src/Google/Protobuf/Internal/FileOptions_OptimizeMode.php       \
-  php/src/Google/Protobuf/Internal/DescriptorProto.php                \
   php/src/Google/Protobuf/Internal/MapField.php                       \
+  php/src/Google/Protobuf/Internal/MapFieldIter.php                   \
+  php/src/Google/Protobuf/Internal/Message.php                        \
+  php/src/Google/Protobuf/Internal/MessageBuilderContext.php          \
+  php/src/Google/Protobuf/Internal/MessageOptions.php                 \
   php/src/Google/Protobuf/Internal/MethodDescriptorProto.php          \
-  php/src/Google/Protobuf/Internal/DescriptorProto_ExtensionRange.php \
-  php/src/Google/Protobuf/Internal/DescriptorProto_ReservedRange.php  \
-  php/src/Google/Protobuf/Internal/RepeatedField.php                  \
-  php/src/Google/Protobuf/Internal/EnumValueOptions.php               \
   php/src/Google/Protobuf/Internal/MethodOptions.php                  \
+  php/src/Google/Protobuf/Internal/MethodOptions/IdempotencyLevel.php \
+  php/src/Google/Protobuf/Internal/OneofDescriptor.php                \
+  php/src/Google/Protobuf/Internal/OneofDescriptorProto.php           \
+  php/src/Google/Protobuf/Internal/OneofField.php                     \
   php/src/Google/Protobuf/Internal/OneofOptions.php                   \
-  php/src/Google/Protobuf/Internal/Message.php                        \
-  php/src/Google/Protobuf/Internal/FileOptions.php                    \
-  php/src/Google/Protobuf/Internal/FileDescriptorSet.php              \
-  php/src/Google/Protobuf/Internal/EnumDescriptorProto.php            \
-  php/src/Google/Protobuf/Internal/GPBWire.php                        \
-  php/src/Google/Protobuf/Internal/FieldDescriptorProto_Label.php     \
-  php/src/Google/Protobuf/Internal/FieldOptions.php                   \
-  php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php   \
-  php/src/Google/Protobuf/Internal/FieldDescriptorProto_Type.php      \
-  php/src/Google/Protobuf/Internal/GPBType.php                        \
-  php/src/Google/Protobuf/Internal/FieldOptions_JSType.php            \
-  php/src/Google/Protobuf/Internal/SourceCodeInfo_Location.php        \
+  php/src/Google/Protobuf/Internal/RawInputStream.php                 \
+  php/src/Google/Protobuf/Internal/RepeatedField.php                  \
+  php/src/Google/Protobuf/Internal/RepeatedFieldIter.php              \
+  php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php         \
+  php/src/Google/Protobuf/Internal/ServiceOptions.php                 \
   php/src/Google/Protobuf/Internal/SourceCodeInfo.php                 \
-  php/src/Google/Protobuf/Internal/EnumOptions.php                    \
-  php/src/Google/Protobuf/Internal/GPBLabel.php                       \
-  php/src/Google/Protobuf/Internal/EnumBuilderContext.php             \
-  php/src/Google/Protobuf/Internal/GPBUtil.php                        \
-  php/src/Google/Protobuf/Internal/FieldOptions_CType.php             \
-  php/src/Google/Protobuf/descriptor.php                              \
-  php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php         \
+  php/src/Google/Protobuf/Internal/SourceCodeInfo/Location.php        \
+  php/src/Google/Protobuf/Internal/UninterpretedOption.php            \
+  php/src/Google/Protobuf/Internal/UninterpretedOption/NamePart.php   \
+  php/src/Google/Protobuf/ListValue.php                               \
+  php/src/Google/Protobuf/Method.php                                  \
+  php/src/Google/Protobuf/Mixin.php                                   \
+  php/src/Google/Protobuf/NullValue.php                               \
+  php/src/Google/Protobuf/OneofDescriptor.php                         \
+  php/src/Google/Protobuf/Option.php                                  \
+  php/src/Google/Protobuf/SourceContext.php                           \
+  php/src/Google/Protobuf/StringValue.php                             \
+  php/src/Google/Protobuf/Struct.php                                  \
+  php/src/Google/Protobuf/Syntax.php                                  \
+  php/src/Google/Protobuf/Timestamp.php                               \
+  php/src/Google/Protobuf/Type.php                                    \
+  php/src/Google/Protobuf/UInt32Value.php                             \
+  php/src/Google/Protobuf/UInt64Value.php                             \
+  php/src/Google/Protobuf/Value.php                                   \
+  php/src/phpdoc.dist.xml                                             \
+  php/tests/array_test.php                                            \
   php/tests/autoload.php                                              \
+  php/tests/bootstrap_phpunit.php                                     \
+  php/tests/compatibility_test.sh                                     \
+  php/tests/descriptors_test.php                                      \
   php/tests/encode_decode_test.php                                    \
-  php/tests/test.sh                                                   \
   php/tests/gdb_test.sh                                               \
   php/tests/generated_class_test.php                                  \
-  php/tests/array_test.php                                            \
+  php/tests/generated_phpdoc_test.php                                 \
+  php/tests/generated_service_test.php                                \
+  php/tests/map_field_test.php                                        \
+  php/tests/memory_leak_test.php                                      \
   php/tests/php_implementation_test.php                               \
+  php/tests/proto/empty/echo.proto                                    \
+  php/tests/proto/test.proto                                          \
+  php/tests/proto/test_descriptors.proto                              \
+  php/tests/proto/test_empty_php_namespace.proto                      \
+  php/tests/proto/test_import_descriptor_proto.proto                  \
   php/tests/proto/test_include.proto                                  \
-  php/tests/map_field_test.php                                        \
-  php/tests/test_base.php                                             \
   php/tests/proto/test_no_namespace.proto                             \
+  php/tests/proto/test_php_namespace.proto                            \
+  php/tests/proto/test_prefix.proto                                   \
+  php/tests/proto/test_reserved_enum_lower.proto                      \
+  php/tests/proto/test_reserved_enum_upper.proto                      \
+  php/tests/proto/test_reserved_enum_value_lower.proto                \
+  php/tests/proto/test_reserved_enum_value_upper.proto                \
+  php/tests/proto/test_reserved_message_lower.proto                   \
+  php/tests/proto/test_reserved_message_upper.proto                   \
+  php/tests/proto/test_service.proto                                  \
+  php/tests/proto/test_service_namespace.proto                        \
+  php/tests/test.sh                                                   \
+  php/tests/test_base.php                                             \
   php/tests/test_util.php                                             \
-  php/tests/proto/test.proto                                          \
-  php/tests/memory_leak_test.php                                      \
-  php/tests/well_known_test.php                                       \
-  php/README.md                                                       \
-  php/ext/google/protobuf/utf8.h                                      \
-  php/ext/google/protobuf/message.c                                   \
-  php/ext/google/protobuf/utf8.c                                      \
-  php/ext/google/protobuf/package.xml                                 \
-  php/ext/google/protobuf/upb.h                                       \
-  php/ext/google/protobuf/array.c                                     \
-  php/ext/google/protobuf/encode_decode.c                             \
-  php/ext/google/protobuf/protobuf.h                                  \
-  php/ext/google/protobuf/type_check.c                                \
-  php/ext/google/protobuf/def.c                                       \
-  php/ext/google/protobuf/storage.c                                   \
-  php/ext/google/protobuf/map.c                                       \
-  php/ext/google/protobuf/config.m4                                   \
-  php/ext/google/protobuf/upb.c                                       \
-  php/ext/google/protobuf/protobuf.c                                  \
-  php/phpunit.xml                                                     \
-  php/composer.json                                                   \
-  composer.json
+  php/tests/undefined_test.php                                        \
+  php/tests/well_known_test.php
 
 python_EXTRA_DIST=                                                           \
   python/MANIFEST.in                                                         \
   python/google/__init__.py                                                  \
   python/google/protobuf/__init__.py                                         \
+  python/google/protobuf/compiler/__init__.py                                \
   python/google/protobuf/descriptor.py                                       \
   python/google/protobuf/descriptor_database.py                              \
   python/google/protobuf/descriptor_pool.py                                  \
@@ -705,9 +779,11 @@ python_EXTRA_DIST=                                                           \
   python/google/protobuf/internal/more_extensions.proto                      \
   python/google/protobuf/internal/more_extensions_dynamic.proto              \
   python/google/protobuf/internal/more_messages.proto                        \
+  python/google/protobuf/internal/no_package.proto                           \
   python/google/protobuf/internal/packed_field_test.proto                    \
   python/google/protobuf/internal/proto_builder_test.py                      \
   python/google/protobuf/internal/python_message.py                          \
+  python/google/protobuf/internal/python_protobuf.cc                         \
   python/google/protobuf/internal/reflection_test.py                         \
   python/google/protobuf/internal/service_reflection_test.py                 \
   python/google/protobuf/internal/symbol_database_test.py                    \
@@ -727,6 +803,8 @@ python_EXTRA_DIST=                                                           \
   python/google/protobuf/json_format.py                                      \
   python/google/protobuf/message.py                                          \
   python/google/protobuf/message_factory.py                                  \
+  python/google/protobuf/python_protobuf.h                                   \
+  python/google/protobuf/proto_api.h                                         \
   python/google/protobuf/proto_builder.py                                    \
   python/google/protobuf/pyext/README                                        \
   python/google/protobuf/pyext/__init__.py                                   \
@@ -750,19 +828,21 @@ python_EXTRA_DIST=                                                           \
   python/google/protobuf/pyext/message_module.cc                             \
   python/google/protobuf/pyext/proto2_api_test.proto                         \
   python/google/protobuf/pyext/python.proto                                  \
-  python/google/protobuf/pyext/python_protobuf.h                             \
   python/google/protobuf/pyext/repeated_composite_container.cc               \
   python/google/protobuf/pyext/repeated_composite_container.h                \
   python/google/protobuf/pyext/repeated_scalar_container.cc                  \
   python/google/protobuf/pyext/repeated_scalar_container.h                   \
   python/google/protobuf/pyext/safe_numerics.h                               \
   python/google/protobuf/pyext/scoped_pyobject_ptr.h                         \
+  python/google/protobuf/pyext/thread_unsafe_shared_ptr.h                    \
   python/google/protobuf/reflection.py                                       \
   python/google/protobuf/service.py                                          \
   python/google/protobuf/service_reflection.py                               \
   python/google/protobuf/symbol_database.py                                  \
   python/google/protobuf/text_encoding.py                                    \
   python/google/protobuf/text_format.py                                      \
+  python/google/protobuf/util/__init__.py                                    \
+  python/release.sh                                                          \
   python/mox.py                                                              \
   python/setup.cfg                                                           \
   python/setup.py                                                            \
@@ -795,6 +875,7 @@ ruby_EXTRA_DIST=                                                             \
   ruby/ext/google/protobuf_c/storage.c                                       \
   ruby/ext/google/protobuf_c/upb.c                                           \
   ruby/ext/google/protobuf_c/upb.h                                           \
+  ruby/ext/google/protobuf_c/wrap_memcpy.c                                   \
   ruby/google-protobuf.gemspec                                               \
   ruby/lib/google/protobuf/message_exts.rb                                   \
   ruby/lib/google/protobuf/repeated_field.rb                                 \
@@ -820,62 +901,115 @@ ruby_EXTRA_DIST=                                                             \
   ruby/src/main/java/google/ProtobufJavaService.java                         \
   ruby/src/main/sentinel.proto                                               \
   ruby/tests/basic.rb                                                        \
+  ruby/tests/encode_decode_test.rb                                           \
+  ruby/tests/gc_test.rb                                                      \
   ruby/tests/repeated_field_test.rb                                          \
   ruby/tests/stress.rb                                                       \
   ruby/tests/generated_code.proto                                            \
   ruby/tests/test_import.proto                                               \
+  ruby/tests/test_ruby_package.proto                                         \
   ruby/tests/generated_code_test.rb                                          \
   ruby/tests/well_known_types_test.rb                                        \
   ruby/travis-test.sh
 
-js_EXTRA_DIST=                              \
-  js/README.md                              \
-  js/binary/arith.js                        \
-  js/binary/arith_test.js                   \
-  js/binary/constants.js                    \
-  js/binary/decoder.js                      \
-  js/binary/decoder_test.js                 \
-  js/binary/encoder.js                      \
-  js/binary/message_test.js                 \
-  js/binary/proto_test.js                   \
-  js/binary/reader.js                       \
-  js/binary/reader_test.js                  \
-  js/binary/utils.js                        \
-  js/binary/utils_test.js                   \
-  js/binary/writer.js                       \
-  js/binary/writer_test.js                  \
-  js/commonjs/export.js                     \
-  js/commonjs/export_asserts.js             \
-  js/commonjs/export_testdeps.js            \
-  js/commonjs/import_test.js                \
-  js/commonjs/jasmine.json                  \
-  js/commonjs/rewrite_tests_for_commonjs.js \
-  js/commonjs/test6/test6.proto             \
-  js/commonjs/test7/test7.proto             \
-  js/data.proto                             \
-  js/debug.js                               \
-  js/debug_test.js                          \
-  js/gulpfile.js                            \
-  js/jasmine.json                           \
-  js/map.js                                 \
-  js/maps_test.js                           \
-  js/message.js                             \
-  js/message_test.js                        \
-  js/node_loader.js                         \
-  js/package.json                           \
-  js/proto3_test.js                         \
-  js/proto3_test.proto                      \
-  js/test.proto                             \
-  js/test2.proto                            \
-  js/test3.proto                            \
-  js/test4.proto                            \
-  js/test5.proto                            \
-  js/test8.proto                            \
-  js/test_bootstrap.js                      \
-  js/testbinary.proto                       \
+js_EXTRA_DIST=                                                         \
+  js/README.md                                                         \
+  js/binary/arith.js                                                   \
+  js/binary/arith_test.js                                              \
+  js/binary/constants.js                                               \
+  js/binary/decoder.js                                                 \
+  js/binary/decoder_test.js                                            \
+  js/binary/encoder.js                                                 \
+  js/binary/message_test.js                                            \
+  js/binary/proto_test.js                                              \
+  js/binary/reader.js                                                  \
+  js/binary/reader_test.js                                             \
+  js/binary/utils.js                                                   \
+  js/binary/utils_test.js                                              \
+  js/binary/writer.js                                                  \
+  js/binary/writer_test.js                                             \
+  js/commonjs/export.js                                                \
+  js/commonjs/export_asserts.js                                        \
+  js/commonjs/export_testdeps.js                                       \
+  js/commonjs/import_test.js                                           \
+  js/commonjs/jasmine.json                                             \
+  js/commonjs/rewrite_tests_for_commonjs.js                            \
+  js/commonjs/test6/test6.proto                                        \
+  js/commonjs/test7/test7.proto                                        \
+  js/compatibility_tests/v3.0.0/binary/arith_test.js                   \
+  js/compatibility_tests/v3.0.0/binary/decoder_test.js                 \
+  js/compatibility_tests/v3.0.0/binary/proto_test.js                   \
+  js/compatibility_tests/v3.0.0/binary/reader_test.js                  \
+  js/compatibility_tests/v3.0.0/binary/utils_test.js                   \
+  js/compatibility_tests/v3.0.0/binary/writer_test.js                  \
+  js/compatibility_tests/v3.0.0/commonjs/export_asserts.js             \
+  js/compatibility_tests/v3.0.0/commonjs/export_testdeps.js            \
+  js/compatibility_tests/v3.0.0/commonjs/import_test.js                \
+  js/compatibility_tests/v3.0.0/commonjs/jasmine.json                  \
+  js/compatibility_tests/v3.0.0/commonjs/rewrite_tests_for_commonjs.js \
+  js/compatibility_tests/v3.0.0/commonjs/test6/test6.proto             \
+  js/compatibility_tests/v3.0.0/commonjs/test7/test7.proto             \
+  js/compatibility_tests/v3.0.0/data.proto                             \
+  js/compatibility_tests/v3.0.0/debug_test.js                          \
+  js/compatibility_tests/v3.0.0/jasmine1.json                          \
+  js/compatibility_tests/v3.0.0/jasmine2.json                          \
+  js/compatibility_tests/v3.0.0/jasmine3.json                          \
+  js/compatibility_tests/v3.0.0/message_test.js                        \
+  js/compatibility_tests/v3.0.0/proto3_test.js                         \
+  js/compatibility_tests/v3.0.0/proto3_test.proto                      \
+  js/compatibility_tests/v3.0.0/test2.proto                            \
+  js/compatibility_tests/v3.0.0/test3.proto                            \
+  js/compatibility_tests/v3.0.0/test4.proto                            \
+  js/compatibility_tests/v3.0.0/test5.proto                            \
+  js/compatibility_tests/v3.0.0/testbinary.proto                       \
+  js/compatibility_tests/v3.0.0/testempty.proto                        \
+  js/compatibility_tests/v3.0.0/test.proto                             \
+  js/compatibility_tests/v3.0.0/test.sh                                \
+  js/compatibility_tests/v3.1.0/testempty.proto                        \
+  js/compatibility_tests/v3.1.0/testbinary.proto                       \
+  js/compatibility_tests/v3.1.0/test5.proto                            \
+  js/compatibility_tests/v3.1.0/test4.proto                            \
+  js/compatibility_tests/v3.1.0/test3.proto                            \
+  js/compatibility_tests/v3.1.0/test2.proto                            \
+  js/compatibility_tests/v3.1.0/test.proto                             \
+  js/compatibility_tests/v3.1.0/proto3_test.proto                      \
+  js/compatibility_tests/v3.1.0/proto3_test.js                         \
+  js/compatibility_tests/v3.1.0/message_test.js                        \
+  js/compatibility_tests/v3.1.0/maps_test.js                           \
+  js/compatibility_tests/v3.1.0/debug_test.js                          \
+  js/compatibility_tests/v3.1.0/data.proto                             \
+  js/compatibility_tests/v3.1.0/commonjs/test7/test7.proto             \
+  js/compatibility_tests/v3.1.0/commonjs/test6/test6.proto             \
+  js/compatibility_tests/v3.1.0/binary/writer_test.js                  \
+  js/compatibility_tests/v3.1.0/binary/utils_test.js                   \
+  js/compatibility_tests/v3.1.0/binary/reader_test.js                  \
+  js/compatibility_tests/v3.1.0/binary/proto_test.js                   \
+  js/compatibility_tests/v3.1.0/binary/decoder_test.js                 \
+  js/compatibility_tests/v3.1.0/binary/arith_test.js                   \
+  js/data.proto                                                        \
+  js/debug.js                                                          \
+  js/debug_test.js                                                     \
+  js/gulpfile.js                                                       \
+  js/jasmine.json                                                      \
+  js/map.js                                                            \
+  js/maps_test.js                                                      \
+  js/message.js                                                        \
+  js/message_test.js                                                   \
+  js/node_loader.js                                                    \
+  js/package.json                                                      \
+  js/proto3_test.js                                                    \
+  js/proto3_test.proto                                                 \
+  js/test.proto                                                        \
+  js/test2.proto                                                       \
+  js/test3.proto                                                       \
+  js/test4.proto                                                       \
+  js/test5.proto                                                       \
+  js/test8.proto                                                       \
+  js/test_bootstrap.js                                                 \
+  js/testbinary.proto                                                  \
   js/testempty.proto
 
-all_EXTRA_DIST=$(csharp_EXTRA_DIST) $(java_EXTRA_DIST) $(javanano_EXTRA_DIST) $(objectivec_EXTRA_DIST) $(php_EXTRA_DIST) $(python_EXTRA_DIST) $(ruby_EXTRA_DIST) $(js_EXTRA_DIST)
+all_EXTRA_DIST=$(csharp_EXTRA_DIST) $(java_EXTRA_DIST) $(objectivec_EXTRA_DIST) $(php_EXTRA_DIST) $(python_EXTRA_DIST) $(ruby_EXTRA_DIST) $(js_EXTRA_DIST)
 
 EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   autogen.sh                             \
@@ -886,7 +1020,6 @@ EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   CHANGES.txt                            \
   update_file_lists.sh                   \
   BUILD                                  \
-  gmock.BUILD                            \
   WORKSPACE                              \
   cmake/CMakeLists.txt                   \
   cmake/README.md                        \
@@ -898,32 +1031,41 @@ EXTRA_DIST = $(@DIST_LANG@_EXTRA_DIST)   \
   cmake/libprotoc.cmake                  \
   cmake/protobuf-config-version.cmake.in \
   cmake/protobuf-config.cmake.in         \
+  cmake/protobuf-lite.pc.cmake           \
   cmake/protobuf-module.cmake.in         \
   cmake/protobuf-options.cmake           \
+  cmake/protobuf.pc.cmake                \
   cmake/protoc.cmake                     \
   cmake/tests.cmake                      \
+  cmake/version.rc.in                    \
   editors/README.txt                     \
   editors/proto.vim                      \
   editors/protobuf-mode.el               \
+  examples/AddPerson.java                \
+  examples/BUILD                         \
   examples/CMakeLists.txt                \
-  examples/README.txt                    \
+  examples/ListPeople.java               \
   examples/Makefile                      \
-  examples/addressbook.proto             \
+  examples/README.md                     \
+  examples/WORKSPACE                     \
   examples/add_person.cc                 \
   examples/add_person.go                 \
+  examples/add_person.py                 \
   examples/add_person_test.go            \
+  examples/addressbook.proto             \
   examples/list_people.cc                \
   examples/list_people.go                \
-  examples/AddPerson.java                \
-  examples/CMakeLists.txt                \
-  examples/ListPeople.java               \
-  examples/add_person.py                 \
   examples/list_people.py                \
   examples/list_people_test.go           \
   protobuf.bzl                           \
+  python/release/wheel/build_wheel_manylinux.sh  \
+  python/release/wheel/Dockerfile                \
+  python/release/wheel/protobuf_optimized_pip.sh \
+  python/release/wheel/README.md         \
   six.BUILD                              \
   util/python/BUILD
 
+
 # Deletes all the files generated by autogen.sh.
 MAINTAINERCLEANFILES =   \
   aclocal.m4             \
diff --git a/Protobuf.podspec b/Protobuf.podspec
index 0db70650..24498a27 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -5,7 +5,7 @@
 # dependent projects use the :git notation to refer to the library.
 Pod::Spec.new do |s|
   s.name     = 'Protobuf'
-  s.version  = '3.2.0'
+  s.version  = '3.5.2'
   s.summary  = 'Protocol Buffers v.3 runtime library for Objective-C.'
   s.homepage = 'https://github.com/google/protobuf'
   s.license  = '3-Clause BSD License'
@@ -36,6 +36,7 @@ Pod::Spec.new do |s|
 
   s.ios.deployment_target = '7.0'
   s.osx.deployment_target = '10.9'
+  s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
   s.requires_arc = false
 end
diff --git a/README.md b/README.md
index b26e5424..f0f2e321 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 Protocol Buffers - Google's data interchange format
 ===================================================
 
-[![Build Status](https://travis-ci.org/google/protobuf.svg?branch=master)](https://travis-ci.org/google/protobuf) [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf) [![Build Status](https://grpc-testing.appspot.com/buildStatus/icon?job=protobuf_branch)](https://grpc-testing.appspot.com/job/protobuf_branch) [![Build Status](https://grpc-testing.appspot.com/job/protobuf_branch_32/badge/icon)](https://grpc-testing.appspot.com/job/protobuf_branch_32) [![Build Status](http://ci.bazel.io/buildStatus/icon?job=protobuf)](http://ci.bazel.io/job/protobuf/)
-
 Copyright 2008 Google Inc.
 
 https://developers.google.com/protocol-buffers/
@@ -37,7 +35,7 @@ as well as a set of standard .proto files distributed along with protobuf.
 If you are looking for an old version that is not available in the release
 page, check out the maven repo here:
 
-  [http://repo1.maven.org/maven2/com/google/protobuf/protoc/](http://repo1.maven.org/maven2/com/google/protobuf/protoc/)
+  [https://repo1.maven.org/maven2/com/google/protobuf/protoc/](https://repo1.maven.org/maven2/com/google/protobuf/protoc/)
 
 These pre-built binaries are only provided for released versions. If you want
 to use the github master version at HEAD, or you need to modify protobuf code,
@@ -54,22 +52,32 @@ Protobuf supports several different programming languages. For each programming
 language, you can find instructions in the corresponding source directory about
 how to install protobuf runtime for that specific language:
 
-| Language                             | Source                                                |
-|--------------------------------------|-------------------------------------------------------|
-| C++ (include C++ runtime and protoc) | [src](src)                                            |
-| Java                                 | [java](java)                                          |
-| Python                               | [python](python)                                      |
-| Objective-C                          | [objectivec](objectivec)                              |
-| C#                                   | [csharp](csharp)                                      |
-| JavaNano                             | [javanano](javanano)                                  |
-| JavaScript                           | [js](js)                                              |
-| Ruby                                 | [ruby](ruby)                                          |
-| Go                                   | [golang/protobuf](https://github.com/golang/protobuf) |
-| PHP                                  | [php](php)                                            |
-
-
-Usage
------
+| Language                             | Source                                                      | Ubuntu | MacOS | Windows |
+|--------------------------------------|-------------------------------------------------------------|--------|-------|---------|
+| C++ (include C++ runtime and protoc) | [src](src)                                                  | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-cpp_distcheck.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fcpp_distcheck%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fcpp%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-cpp_distcheck.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fcpp_distcheck%2Fcontinuous) | [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf) |
+| Java                                 | [java](java)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-java_compatibility.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_compatibility%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-java_jdk7.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_jdk7%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-java_oracle7.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjava_oracle7%2Fcontinuous) | | |
+| Python                               | [python](python)                                            | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-python.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-python_compatibility.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython_compatibility%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-python_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fpython_cpp%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-python.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fpython%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-python_cpp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fpython_cpp%2Fcontinuous) | |
+| Objective-C                          | [objectivec](objectivec)                                    | | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_cocoapods_integration.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_cocoapods_integration%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_ios_debug.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_debug%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_ios_release.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_ios_release%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-objectivec_osx.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fobjectivec_osx%2Fcontinuous) | |
+| C#                                   | [csharp](csharp)                                            | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-csharp.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fcsharp%2Fcontinuous) | | [![Build status](https://ci.appveyor.com/api/projects/status/73ctee6ua4w2ruin?svg=true)](https://ci.appveyor.com/project/protobuf/protobuf) |
+| JavaScript                           | [js](js)                                                    | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fjavascript%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-javascript.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fjavascript%2Fcontinuous) | |
+| Ruby                                 | [ruby](ruby)                                                | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-ruby_all.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fruby_all%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby21.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby21%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-ruby22.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fruby22%2Fcontinuous) | |
+| Go                                   | [golang/protobuf](https://github.com/golang/protobuf)       | | | |
+| PHP                                  | [php](php)                                                  | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-php_all.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2Fphp_all%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/linux-32-bit.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fubuntu%2F32-bit%2Fcontinuous) | [![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-php5.6_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp5.6_mac%2Fcontinuous)<br/>[![Build status](https://storage.googleapis.com/protobuf-kokoro-results/status-badge/macos-php7.0_mac.png)](https://fusion.corp.google.com/projectanalysis/current/KOKORO/prod:protobuf%2Fgithub%2Fmaster%2Fmacos%2Fphp7.0_mac%2Fcontinuous) | |
+| Dart                                 | [dart-lang/protobuf](https://github.com/dart-lang/protobuf) | | | |
+
+Quick Start
+-----------
+
+The best way to learn how to use protobuf is to follow the tutorials in our
+developer guide:
+
+https://developers.google.com/protocol-buffers/docs/tutorials
+
+If you want to learn from code examples, take a look at the examples in the
+[examples](examples) directory.
+
+Documentation
+-------------
 
 The complete documentation for Protocol Buffers is available via the
 web at:
diff --git a/WORKSPACE b/WORKSPACE
index 2a49e372..06a8a841 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1,8 +1,9 @@
-new_git_repository(
-    name = "googletest",
-    build_file = "gmock.BUILD",
-    remote = "https://github.com/google/googletest",
-    tag = "release-1.8.0",
+workspace(name = "com_google_protobuf")
+
+new_local_repository(
+    name = "submodule_gmock",
+    path = "third_party/googletest",
+    build_file = "third_party/googletest/BUILD.bazel"
 )
 
 new_http_archive(
@@ -19,12 +20,12 @@ bind(
 
 bind(
     name = "gtest",
-    actual = "@googletest//:gtest",
+    actual = "@submodule_gmock//:gtest",
 )
 
 bind(
     name = "gtest_main",
-    actual = "@googletest//:gtest_main",
+    actual = "@submodule_gmock//:gtest_main",
 )
 
 bind(
diff --git a/appveyor.bat b/appveyor.bat
index 916f4434..29ec4922 100644
--- a/appveyor.bat
+++ b/appveyor.bat
@@ -1,11 +1,23 @@
 setlocal
 
+IF %platform%==MinGW GOTO build_mingw
 IF %language%==cpp GOTO build_cpp
 IF %language%==csharp GOTO build_csharp
 
-echo Unsupported language %language%. Exiting.
+echo Unsupported language %language% and platform %platform%. Exiting.
 goto :error
 
+:build_mingw
+echo Building MinGW
+set PATH=C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;%PATH:C:\Program Files\Git\usr\bin;=%
+mkdir build_mingw
+cd build_mingw
+cmake -G "%generator%" -Dprotobuf_BUILD_SHARED_LIBS=%BUILD_DLL% -Dprotobuf_UNICODE=%UNICODE% -Dprotobuf_BUILD_TESTS=0 ../cmake
+mingw32-make -j8 all || goto error
+rem cd %configuration%
+rem tests.exe || goto error
+goto :EOF
+
 :build_cpp
 echo Building C++
 mkdir build_msvc
@@ -19,11 +31,15 @@ goto :EOF
 :build_csharp
 echo Building C#
 cd csharp\src
+REM The platform environment variable is implicitly used by msbuild;
+REM we don't want it.
+set platform=
 dotnet restore
-dotnet build -c %configuration% Google.Protobuf Google.Protobuf.Test Google.Protobuf.Conformance || goto error
+dotnet build -c %configuration% || goto error
 
 echo Testing C#
-dotnet test -c %configuration% Google.Protobuf.Test || goto error
+dotnet test -c %configuration% -f netcoreapp1.0 Google.Protobuf.Test\Google.Protobuf.Test.csproj || goto error
+dotnet test -c %configuration% -f net451 Google.Protobuf.Test\Google.Protobuf.Test.csproj || goto error
 
 goto :EOF
 
diff --git a/appveyor.yml b/appveyor.yml
index 08d087b6..1dd076a4 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,40 +1,36 @@
-# Only test one combination: "Visual Studio 12 + Win64 + Debug + DLL". We can
-# test more combinations but AppVeyor just takes too long to finish (each
-# combination takes ~15mins).
-platform:
-  - Win64
-
 configuration:
   - Debug
 
 environment:
   matrix:
-    - language: cpp
+    # Only test few combinations: "Visual Studio 2015 (14) + Win64/MinGW + Debug + DLL". We can
+    # test more combinations but AppVeyor just takes too long to finish (each
+    # combination takes ~15mins).
+    - platform: MinGW
+      language: cpp
+      image: Visual Studio 2015
+
+    - platform: Win64
+      language: cpp
+      image: Visual Studio 2015
       BUILD_DLL: ON
       UNICODE: ON
 
-    - language: csharp
+    - platform: Win64
+      language: csharp
+      image: Visual Studio 2017
 
 # Our build scripts run tests automatically; we don't want AppVeyor
 # to try to detect them itself.
 test: off
 
 install:
-  - curl -L -o release-1.7.0.zip https://github.com/google/googlemock/archive/release-1.7.0.zip
-  - 7z x release-1.7.0.zip
-  - del /Q release-1.7.0.zip
-  - rename googlemock-release-1.7.0 gmock
-  - curl -L -o release-1.7.0.zip "https://github.com/google/googletest/archive/release-1.7.0.zip"
-  - 7z x release-1.7.0.zip
-  - del /Q release-1.7.0.zip
-  - rename googletest-release-1.7.0 gtest
-  - move gtest gmock
-  - curl -L -o dotnetsdk.exe "https://go.microsoft.com/fwlink/?LinkID=809122"
-  - dotnetsdk.exe /install /quiet /norestart
+  - git submodule update --init --recursive
 
 before_build:
-  - if %platform%==Win32 set generator=Visual Studio 12
-  - if %platform%==Win64 set generator=Visual Studio 12 Win64
+  - if %platform%==MinGW set generator=MinGW Makefiles
+  - if %platform%==Win32 set generator=Visual Studio 14
+  - if %platform%==Win64 set generator=Visual Studio 14 Win64
   - if %platform%==Win32 set vcplatform=Win32
   - if %platform%==Win64 set vcplatform=x64
 
diff --git a/autogen.sh b/autogen.sh
index 9f266425..580714b9 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -17,7 +17,6 @@ if [ ! -z "$@" ]; then
   done
 fi
 
-
 # Check that we're being run from the right directory.
 if test ! -f src/google/protobuf/stubs/common.h; then
   cat >&2 << __EOF__
@@ -27,21 +26,6 @@ __EOF__
   exit 1
 fi
 
-# Check that gmock is present.  Usually it is already there since the
-# directory is set up as an SVN external.
-if test ! -e gmock; then
-  echo "Google Mock not present.  Fetching gmock-1.7.0 from the web..."
-  curl $curlopts -L -O https://github.com/google/googlemock/archive/release-1.7.0.zip
-  unzip -q release-1.7.0.zip
-  rm release-1.7.0.zip
-  mv googlemock-release-1.7.0 gmock
-
-  curl $curlopts -L -O https://github.com/google/googletest/archive/release-1.7.0.zip
-  unzip -q release-1.7.0.zip
-  rm release-1.7.0.zip
-  mv googletest-release-1.7.0 gmock/gtest
-fi
-
 set -ex
 
 # TODO(kenton):  Remove the ",no-obsolete" part and fix the resulting warnings.
diff --git a/benchmarks/Makefile.am b/benchmarks/Makefile.am
index d98eae5e..9f609228 100644
--- a/benchmarks/Makefile.am
+++ b/benchmarks/Makefile.am
@@ -1,78 +1,551 @@
+benchmarks_protoc_inputs_benchmark_wrapper =                               \
+	benchmarks.proto
 
-benchmarks_protoc_inputs =                                     \
-  benchmarks.proto                                             \
-  benchmark_messages_proto3.proto
+benchmarks_protoc_inputs =                                                 \
+	datasets/google_message1/proto3/benchmark_message1_proto3.proto
 
-benchmarks_protoc_inputs_proto2 =                              \
-  benchmark_messages_proto2.proto
+benchmarks_protoc_inputs_proto2 =                                          \
+	datasets/google_message1/proto2/benchmark_message1_proto2.proto          \
+	datasets/google_message2/benchmark_message2.proto                        \
+	datasets/google_message3/benchmark_message3.proto                        \
+	datasets/google_message3/benchmark_message3_1.proto                      \
+	datasets/google_message3/benchmark_message3_2.proto                      \
+	datasets/google_message3/benchmark_message3_3.proto                      \
+	datasets/google_message3/benchmark_message3_4.proto                      \
+	datasets/google_message3/benchmark_message3_5.proto                      \
+	datasets/google_message3/benchmark_message3_6.proto                      \
+	datasets/google_message3/benchmark_message3_7.proto                      \
+	datasets/google_message3/benchmark_message3_8.proto                      \
+	datasets/google_message4/benchmark_message4.proto                        \
+	datasets/google_message4/benchmark_message4_1.proto                      \
+	datasets/google_message4/benchmark_message4_2.proto                      \
+	datasets/google_message4/benchmark_message4_3.proto
 
-benchmarks_protoc_outputs =                                    \
-  benchmarks.pb.cc                                             \
-  benchmarks.pb.h                                              \
-  benchmark_messages_proto3.pb.cc                              \
-  benchmark_messages_proto3.pb.h
+make_tmp_dir:
+	mkdir -p 'tmp/java/src/main/java'
+	touch make_tmp_dir
 
-benchmarks_protoc_outputs_proto2 =                             \
-  benchmark_messages_proto2.pb.cc                              \
-  benchmark_messages_proto2.pb.h
+# We have to cd to $(srcdir) before executing protoc because $(protoc_inputs) is
+# relative to srcdir, which may not be the same as the current directory when
+# building out-of-tree.
+protoc_middleman: make_tmp_dir $(top_srcdir)/src/protoc$(EXEEXT) $(benchmarks_protoc_inputs) $(well_known_type_protoc_inputs) $(benchmarks_protoc_inputs_benchmark_wrapper)
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd/cpp --java_out=$$oldpwd/tmp/java/src/main/java --python_out=$$oldpwd/tmp $(benchmarks_protoc_inputs) $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	touch protoc_middleman
+
+protoc_middleman2:  make_tmp_dir $(top_srcdir)/src/protoc$(EXEEXT) $(benchmarks_protoc_inputs_proto2) $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd/cpp --java_out=$$oldpwd/tmp/java/src/main/java --python_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_proto2) )
+	touch protoc_middleman2
+
+all_data = $$(find $(srcdir) -type f -name "dataset.*.pb" -not -path "./tmp/*")
+
+############# CPP RULES ##############
+
+benchmarks_protoc_outputs =                                                \
+	cpp/benchmarks.pb.cc                                                     \
+	cpp/datasets/google_message1/proto3/benchmark_message1_proto3.pb.cc
+
+benchmarks_protoc_outputs_header =                                         \
+	cpp/benchmarks.pb.h                                                      \
+	cpp/datasets/google_message1/proto3/benchmark_message1_proto3.pb.h
+
+benchmarks_protoc_outputs_proto2_header =                                  \
+	cpp/datasets/google_message1/proto2/benchmark_message1_proto2.pb.h       \
+	cpp/datasets/google_message2/benchmark_message2.pb.h                     \
+	cpp/datasets/google_message3/benchmark_message3.pb.h                     \
+	cpp/datasets/google_message3/benchmark_message3_1.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_2.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_3.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_4.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_5.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_6.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_7.pb.h                   \
+	cpp/datasets/google_message3/benchmark_message3_8.pb.h                   \
+	cpp/datasets/google_message4/benchmark_message4.pb.h                     \
+	cpp/datasets/google_message4/benchmark_message4_1.pb.h                   \
+	cpp/datasets/google_message4/benchmark_message4_2.pb.h                   \
+	cpp/datasets/google_message4/benchmark_message4_3.pb.h
+
+benchmarks_protoc_outputs_proto2 =                                         \
+	cpp/datasets/google_message1/proto2/benchmark_message1_proto2.pb.cc      \
+	cpp/datasets/google_message2/benchmark_message2.pb.cc                    \
+	cpp/datasets/google_message3/benchmark_message3.pb.cc                    \
+	cpp/datasets/google_message3/benchmark_message3_1.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_2.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_3.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_4.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_5.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_6.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_7.pb.cc                  \
+	cpp/datasets/google_message3/benchmark_message3_8.pb.cc                  \
+	cpp/datasets/google_message4/benchmark_message4.pb.cc                    \
+	cpp/datasets/google_message4/benchmark_message4_1.pb.cc                  \
+	cpp/datasets/google_message4/benchmark_message4_2.pb.cc                  \
+	cpp/datasets/google_message4/benchmark_message4_3.pb.cc
+
+
+$(benchmarks_protoc_outputs): protoc_middleman
+$(benchmarks_protoc_outputs_header): protoc_middleman
+$(benchmarks_protoc_outputs_proto2): protoc_middleman2
+$(benchmarks_protoc_outputs_proto2_header): protoc_middleman2
+
+initialize_submodule:
+	oldpwd=`pwd`
+	cd $(top_srcdir)/third_party
+	git submodule update --init -r
+	cd $(top_srcdir)/third_party/benchmark && cmake -DCMAKE_BUILD_TYPE=Release && make
+	cd $$oldpwd
+	touch initialize_submodule
+
+$(top_srcdir)/third_party/benchmark/src/libbenchmark.a: initialize_submodule
 
 AM_CXXFLAGS = $(NO_OPT_CXXFLAGS) $(PROTOBUF_OPT_FLAG) -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare
 
-bin_PROGRAMS = generate-datasets cpp-benchmark
+bin_PROGRAMS = cpp-benchmark
+
+cpp_benchmark_LDADD = $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/third_party/benchmark/src/libbenchmark.a
+cpp_benchmark_SOURCES = cpp/cpp_benchmark.cc
+cpp_benchmark_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp -I$(top_srcdir)/third_party/benchmark/include
+# Explicit deps because BUILT_SOURCES are only done before a "make all/check"
+# so a direct "make test_cpp" could fail if parallel enough.
+# See: https://www.gnu.org/software/automake/manual/html_node/Built-Sources-Example.html#Recording-Dependencies-manually
+cpp/cpp_benchmark-cpp_benchmark.$(OBJEXT): $(benchmarks_protoc_outputs) $(benchmarks_protoc_outputs_proto2) $(benchmarks_protoc_outputs_header) $(benchmarks_protoc_outputs_proto2_header) $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/third_party/benchmark/src/libbenchmark.a
+nodist_cpp_benchmark_SOURCES =                                             \
+	$(benchmarks_protoc_outputs)                                             \
+	$(benchmarks_protoc_outputs_proto2)                                      \
+	$(benchmarks_protoc_outputs_proto2_header)                               \
+	$(benchmarks_protoc_outputs_header)
+
+cpp: protoc_middleman protoc_middleman2 cpp-benchmark initialize_submodule
+	./cpp-benchmark $(all_data)
+
+############ CPP RULES END ############
+
+############# JAVA RULES ##############
+
+java_benchmark_testing_files =                                      \
+	java/src/main/java/com/google/protobuf/ProtoCaliperBenchmark.java
+
+javac_middleman: $(java_benchmark_testing_files) protoc_middleman protoc_middleman2
+	cp -r $(srcdir)/java tmp 
+	mkdir -p tmp/java/lib
+	cp $(top_srcdir)/java/core/target/*.jar tmp/java/lib/protobuf-java.jar
+	cd tmp/java && mvn clean compile assembly:single -Dprotobuf.version=$(PACKAGE_VERSION) && cd ../..
+	@touch javac_middleman
+
+java-benchmark: javac_middleman
+	@echo "Writing shortcut script java-benchmark..."
+	@echo '#! /bin/bash' > java-benchmark
+	@echo 'all_data=""' >> java-benchmark
+	@echo 'conf=()' >> java-benchmark
+	@echo 'data_files=""' >> java-benchmark
+	@echo 'for arg in $$@; do if [[ $${arg:0:1} == "-" ]]; then conf+=($$arg); else data_files+="$$arg,"; fi; done' >> java-benchmark
+	@echo 'java -cp '\"tmp/java/target/*:$(top_srcdir)/java/core/target/*:$(top_srcdir)/java/util/target/*\"" \\" >>java-benchmark
+	@echo '   com.google.caliper.runner.CaliperMain com.google.protobuf.ProtoCaliperBenchmark -i runtime '"\\"  >> java-benchmark
+	@echo '   -b serializeToByteArray,serializeToMemoryStream,deserializeFromByteArray,deserializeFromMemoryStream '"\\" >> java-benchmark
+	@echo '   -DdataFile=$${data_files:0:-1} $${conf[*]}' >> java-benchmark
+	@chmod +x java-benchmark
+
+java: protoc_middleman protoc_middleman2 java-benchmark
+	./java-benchmark $(all_data)
+
+############# JAVA RULES END ##############
+
+
+############# PYTHON RULES ##############
+
+python_add_init: protoc_middleman protoc_middleman2
+	all_file=`find tmp -type f -regex '.*\.py'` &&                   \
+	for file in $${all_file[@]}; do                                  \
+		path="$${file%/*}";                                            \
+		while true; do                                                 \
+			touch "$$path/__init__.py" && chmod +x "$$path/__init__.py"; \
+			if [[ $$path != *"/"* ]]; then break; fi;                    \
+			path=$${path%/*};                                            \
+		done                                                           \
+	done
+
+python_cpp_pkg_flags = `pkg-config --cflags --libs python`
+
+lib_LTLIBRARIES = libbenchmark_messages.la
+libbenchmark_messages_la_SOURCES = python/python_benchmark_messages.cc
+libbenchmark_messages_la_LIBADD = $(top_srcdir)/src/.libs/libprotobuf.la
+libbenchmark_messages_la_LDFLAGS = -version-info 1:0:0 -export-dynamic
+libbenchmark_messages_la_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp $(python_cpp_pkg_flags)
+libbenchmark_messages_la-python_benchmark_messages.$(OBJEXT): $(benchmarks_protoc_outputs_header) $(benchmarks_protoc_outputs_proto2_header) $(benchmarks_protoc_outputs) $(benchmarks_protoc_outputs_proto2)
+nodist_libbenchmark_messages_la_SOURCES =                         \
+	$(benchmarks_protoc_outputs)                                    \
+	$(benchmarks_protoc_outputs_proto2)                             \
+	$(benchmarks_protoc_outputs_proto2_header)                      \
+	$(benchmarks_protoc_outputs_header)
+
+python-pure-python-benchmark: python_add_init
+	@echo "Writing shortcut script python-pure-python-benchmark..."
+	@echo '#! /bin/bash' > python-pure-python-benchmark
+	@echo export LD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-pure-python-benchmark
+	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-pure-python-benchmark
+	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'python\' >> python-pure-python-benchmark
+	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-pure-python-benchmark
+	@echo python tmp/py_benchmark.py '$$@' >> python-pure-python-benchmark
+	@chmod +x python-pure-python-benchmark
+
+python-cpp-reflection-benchmark: python_add_init
+	@echo "Writing shortcut script python-cpp-reflection-benchmark..."
+	@echo '#! /bin/bash' > python-cpp-reflection-benchmark
+	@echo export LD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-reflection-benchmark
+	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-reflection-benchmark
+	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'cpp\' >> python-cpp-reflection-benchmark
+	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-cpp-reflection-benchmark
+	@echo python tmp/py_benchmark.py '$$@' >> python-cpp-reflection-benchmark
+	@chmod +x python-cpp-reflection-benchmark
+
+python-cpp-generated-code-benchmark: python_add_init libbenchmark_messages.la
+	@echo "Writing shortcut script python-cpp-generated-code-benchmark..."
+	@echo '#! /bin/bash' > python-cpp-generated-code-benchmark
+	@echo export LD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-generated-code-benchmark
+	@echo export DYLD_LIBRARY_PATH=$(top_srcdir)/src/.libs >> python-cpp-generated-code-benchmark
+	@echo export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=\'cpp\' >> python-cpp-generated-code-benchmark
+	@echo cp $(srcdir)/python/py_benchmark.py tmp >> python-cpp-generated-code-benchmark
+	@echo python tmp/py_benchmark.py --cpp_generated '$$@' >> python-cpp-generated-code-benchmark
+	@chmod +x python-cpp-generated-code-benchmark
+
+python-pure-python: python-pure-python-benchmark
+	./python-pure-python-benchmark $(all_data)
+
+python-cpp-reflection: python-cpp-reflection-benchmark
+	./python-cpp-reflection-benchmark $(all_data)
+
+python-cpp-generated-code: python-cpp-generated-code-benchmark
+	./python-cpp-generated-code-benchmark $(all_data)
+
+############# PYTHON RULES END ##############
 
-generate_datasets_LDADD = $(top_srcdir)/src/libprotobuf.la
-generate_datasets_SOURCES = generate_datasets.cc
-generate_datasets_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)
-nodist_generate_datasets_SOURCES =                             \
-  $(benchmarks_protoc_outputs)                                 \
-  $(benchmarks_protoc_outputs_proto2)
+############# GO RULES BEGIN ##############
 
+benchmarks_protoc_inputs_proto2_message1 =                                 \
+	datasets/google_message1/proto2/benchmark_message1_proto2.proto
+
+benchmarks_protoc_inputs_proto2_message2 =                                 \
+	datasets/google_message2/benchmark_message2.proto
+
+benchmarks_protoc_inputs_proto2_message3 =                                 \
+	datasets/google_message3/benchmark_message3.proto                        \
+	datasets/google_message3/benchmark_message3_1.proto                      \
+	datasets/google_message3/benchmark_message3_2.proto                      \
+	datasets/google_message3/benchmark_message3_3.proto                      \
+	datasets/google_message3/benchmark_message3_4.proto                      \
+	datasets/google_message3/benchmark_message3_5.proto                      \
+	datasets/google_message3/benchmark_message3_6.proto                      \
+	datasets/google_message3/benchmark_message3_7.proto                      \
+	datasets/google_message3/benchmark_message3_8.proto
+
+benchmarks_protoc_inputs_proto2_message4 =                                 \
+	datasets/google_message4/benchmark_message4.proto                        \
+	datasets/google_message4/benchmark_message4_1.proto                      \
+	datasets/google_message4/benchmark_message4_2.proto                      \
+	datasets/google_message4/benchmark_message4_3.proto
+
+go_protoc_middleman: make_tmp_dir $(top_srcdir)/src/protoc$(EXEEXT) $(benchmarks_protoc_inputs) $(well_known_type_protoc_inputs) $(benchmarks_protoc_inputs_proto2_message1) $(benchmarks_protoc_inputs_proto2_message2) $(benchmarks_protoc_inputs_proto2_message3) $(benchmarks_protoc_inputs_proto2_message4) $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --go_out=$$oldpwd/tmp $(benchmarks_protoc_inputs_proto2_message4) )
+	touch go_protoc_middleman
+
+go-benchmark: go_protoc_middleman 
+	@echo "Writing shortcut script go-benchmark..."
+	@echo '#! /bin/bash' > go-benchmark
+	@echo 'cd $(srcdir)/go' >> go-benchmark
+	@echo 'all_data=""' >> go-benchmark
+	@echo 'conf=()' >> go-benchmark
+	@echo 'data_files=()' >> go-benchmark
+	@echo 'for arg in $$@; do if [[ $${arg:0:1} == "-" ]]; then conf+=($$arg); else data_files+=("../$$arg"); fi; done' >> go-benchmark
+	@echo 'go test -bench=. $${conf[*]} -- $${data_files[*]}' >> go-benchmark
+	@echo 'cd ..' >> go-benchmark
+	@chmod +x go-benchmark
+
+go: go_protoc_middleman go-benchmark 
+	./go-benchmark $(all_data)
+
+############# GO RULES END ##############
+
+############# GOGO RULES BEGIN ############
+
+cpp_no_group_benchmarks_protoc_outputs_header =                             \
+	gogo/cpp_no_group/benchmarks.pb.h                                         \
+	gogo/cpp_no_group/datasets/google_message1/proto3/benchmark_message1_proto3.pb.h
+
+cpp_no_group_benchmarks_protoc_outputs =                                    \
+	gogo/cpp_no_group/benchmarks.pb.cc                                        \
+	gogo/cpp_no_group/datasets/google_message1/proto3/benchmark_message1_proto3.pb.cc
+
+cpp_no_group_benchmarks_protoc_outputs_proto2_header =                      \
+	gogo/cpp_no_group/datasets/google_message1/proto2/benchmark_message1_proto2.pb.h \
+	gogo/cpp_no_group/datasets/google_message2/benchmark_message2.pb.h        \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3.pb.h        \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_1.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_2.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_3.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_4.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_5.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_6.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_7.pb.h      \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_8.pb.h      \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4.pb.h        \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_1.pb.h      \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_2.pb.h      \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_3.pb.h
+
+cpp_no_group_benchmarks_protoc_outputs_proto2 =                             \
+	gogo/cpp_no_group/datasets/google_message1/proto2/benchmark_message1_proto2.pb.cc \
+	gogo/cpp_no_group/datasets/google_message2/benchmark_message2.pb.cc       \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3.pb.cc       \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_1.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_2.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_3.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_4.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_5.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_6.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_7.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message3/benchmark_message3_8.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4.pb.cc       \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_1.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_2.pb.cc     \
+	gogo/cpp_no_group/datasets/google_message4/benchmark_message4_3.pb.cc
+
+$(cpp_no_group_benchmarks_protoc_outputs): cpp_no_group_protoc_middleman
+$(cpp_no_group_benchmarks_protoc_outputs_header): cpp_no_group_protoc_middleman
+$(cpp_no_group_benchmarks_protoc_outputs_proto2): cpp_no_group_protoc_middleman
+$(cpp_no_group_benchmarks_protoc_outputs_proto2_header): cpp_no_group_protoc_middleman
+
+generate_cpp_no_group_benchmark_code:
+	cp $(srcdir)/cpp/cpp_benchmark.cc gogo/cpp_no_group/cpp_benchmark.cc
+	sed -i -e "s/\#include \"datasets/\#include \"gogo\/cpp_no_group\/datasets/g" gogo/cpp_no_group/cpp_benchmark.cc
+	sed -i -e "s/\#include \"benchmarks.pb.h/\#include \"gogo\/cpp_no_group\/benchmarks.pb.h/g" gogo/cpp_no_group/cpp_benchmark.cc  
+	touch generate_cpp_no_group_benchmark_code
+	
+bin_PROGRAMS += cpp-no-group-benchmark
+cpp_no_group_benchmark_LDADD = $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/third_party/benchmark/src/libbenchmark.a
+cpp_no_group_benchmark_SOURCES = gogo/cpp_no_group/cpp_benchmark.cc
+cpp_no_group_benchmark_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/gogo/cpp_no_group -I$(top_srcdir)/third_party/benchmark/include
 # Explicit deps because BUILT_SOURCES are only done before a "make all/check"
 # so a direct "make test_cpp" could fail if parallel enough.
 # See: https://www.gnu.org/software/automake/manual/html_node/Built-Sources-Example.html#Recording-Dependencies-manually
-generate_datasets-generate_datasets.$(OBJEXT): benchmarks.pb.h
+gogo/cpp_no_group/cpp_no_group_benchmark-cpp_benchmark.$(OBJEXT): $(cpp_no_group_benchmarks_protoc_outputs) $(cpp_no_group_benchmarks_protoc_outputs_proto2) $(cpp_no_group_benchmarks_protoc_outputs_header) \
+	$(cpp_no_group_benchmarks_protoc_outputs_proto2_header) $(top_srcdir)/third_party/benchmark/src/libbenchmark.a generate_cpp_no_group_benchmark_code
+gogo/cpp_no_group/cpp_benchmark.cc: generate_cpp_no_group_benchmark_code
+nodist_cpp_no_group_benchmark_SOURCES =                                    \
+	$(cpp_no_group_benchmarks_protoc_outputs_proto2)                         \
+	$(cpp_no_group_benchmarks_protoc_outputs)                                \
+	$(cpp_no_group_benchmarks_protoc_outputs_header)                         \
+	$(cpp_no_group_benchmarks_protoc_outputs_proto2_header)
 
-cpp_benchmark_LDADD = $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/third_party/benchmark/src/libbenchmark.a
-cpp_benchmark_SOURCES = cpp_benchmark.cc
-cpp_benchmark_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir) -I$(top_srcdir)/third_party/benchmark/include
-nodist_cpp_benchmark_SOURCES =                             \
-  $(benchmarks_protoc_outputs)                                 \
-  $(benchmarks_protoc_outputs_proto2)
+cpp_no_group: cpp_no_group_protoc_middleman generate_gogo_data cpp-no-group-benchmark
+	./cpp-no-group-benchmark $(gogo_data)
+ 
+gogo_proto_middleman: protoc-gen-gogoproto
+	mkdir -p "tmp/gogo_proto"
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I$(srcdir) -I$(top_srcdir) --plugin=protoc-gen-gogoproto --gogoproto_out=$$oldpwd/tmp/gogo_proto $(benchmarks_protoc_inputs) $(benchmarks_protoc_inputs_benchmark_wrapper) $(benchmarks_protoc_inputs_proto2) )
+	touch gogo_proto_middleman
 
-$(benchmarks_protoc_outputs): protoc_middleman
-$(benchmarks_protoc_outputs_proto2): protoc_middleman2
+gogo_data = $$(for data in $(all_data); do echo "tmp/gogo_data$${data\#$(srcdir)}"; done | xargs)
 
-CLEANFILES =                                                   \
-  $(benchmarks_protoc_outputs)                                 \
-  $(benchmarks_protoc_outputs_proto2)                          \
-  protoc_middleman                                             \
-  protoc_middleman2                                            \
-  dataset.*
+generate_gogo_data: protoc_middleman protoc_middleman2 gogo-data-scrubber
+	mkdir -p `dirname $(gogo_data)`
+	./gogo-data-scrubber $(all_data) $(gogo_data)
+	touch generate_gogo_data
+	
+make_tmp_dir_gogo:
+	mkdir -p tmp/go_no_group/benchmark_code
+	mkdir -p tmp/gogofast/benchmark_code
+	mkdir -p tmp/gogofaster/benchmark_code
+	mkdir -p tmp/gogoslick/benchmark_code
+	touch make_tmp_dir_gogo
 
-MAINTAINERCLEANFILES =   \
-  Makefile.in
+go_no_group_protoc_middleman: make_tmp_dir_gogo $(top_srcdir)/src/protoc$(EXEEXT) gogo_proto_middleman $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --go_out=$$oldpwd/tmp/go_no_group $(benchmarks_protoc_inputs_proto2_message4) )
+	touch go_no_group_protoc_middleman
 
-if USE_EXTERNAL_PROTOC
+cpp_no_group_protoc_middleman: make_tmp_dir_gogo $(top_srcdir)/src/protoc$(EXEEXT) gogo_proto_middleman $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --cpp_out=$$oldpwd/gogo/cpp_no_group $(benchmarks_protoc_inputs_proto2_message4) )
+	touch cpp_no_group_protoc_middleman
 
-protoc_middleman: $(benchmarks_protoc_inputs)
-	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. $(benchmarks_protoc_inputs)
-	touch protoc_middleman
+gogofast_protoc_middleman: make_tmp_dir_gogo $(top_srcdir)/src/protoc$(EXEEXT) gogo_proto_middleman $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofast_out=$$oldpwd/tmp/gogofast $(benchmarks_protoc_inputs_proto2_message4) )
+	touch gogofast_protoc_middleman
 
-protoc_middleman2: $(benchmarks_protoc_inputs_proto2)
-	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. $(benchmarks_protoc_inputs_proto2)
-	touch protoc_middleman2
+gogofaster_protoc_middleman: make_tmp_dir_gogo $(top_srcdir)/src/protoc$(EXEEXT) gogo_proto_middleman $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogofaster_out=$$oldpwd/tmp/gogofaster $(benchmarks_protoc_inputs_proto2_message4) )
+	touch gogofaster_protoc_middleman
 
-else
+gogoslick_protoc_middleman: make_tmp_dir_gogo $(top_srcdir)/src/protoc$(EXEEXT) gogo_proto_middleman $(well_known_type_protoc_inputs)
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs_benchmark_wrapper) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs_proto2_message1) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs_proto2_message2) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs_proto2_message3) )
+	oldpwd=`pwd` && ( cd $(srcdir)/tmp/gogo_proto && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$$oldpwd/$(top_srcdir)/src --gogoslick_out=$$oldpwd/tmp/gogoslick $(benchmarks_protoc_inputs_proto2_message4) )
+	touch gogoslick_protoc_middleman
 
-# We have to cd to $(srcdir) before executing protoc because $(protoc_inputs) is
-# relative to srcdir, which may not be the same as the current directory when
-# building out-of-tree.
-protoc_middleman: $(top_srcdir)/src/protoc$(EXEEXT) $(benchmarks_protoc_inputs) $(well_known_type_protoc_inputs)
-	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd $(benchmarks_protoc_inputs) )
-	touch protoc_middleman
+generate-gogo-benchmark-code:
+	@echo '#! /bin/bash' > generate-gogo-benchmark-code
+	@echo 'cp $(srcdir)/go/go_benchmark_test.go tmp/$$1/benchmark_code/$$1_benchmark1_test.go' >> generate-gogo-benchmark-code
+	@echo 'sed -i -e "s/\.\.\/tmp/../g" tmp/$$1/benchmark_code/$$1_benchmark1_test.go' >> generate-gogo-benchmark-code
+	@echo 'sed -i -e "s/b\.Run(\"\(.*\)\"/b.Run(\"\1\_$$1\"/g" tmp/$$1/benchmark_code/$$1_benchmark1_test.go' >> generate-gogo-benchmark-code
+	@echo 'if [[ $$2 == 1 ]]; then sed -i -e "s/github\.com\/golang/github.com\/gogo/g" tmp/$$1/benchmark_code/$$1_benchmark1_test.go; fi ' >> generate-gogo-benchmark-code
+	@chmod +x generate-gogo-benchmark-code
 
-protoc_middleman2: $(top_srcdir)/src/protoc$(EXEEXT) $(benchmarks_protoc_inputs_proto2) $(well_known_type_protoc_inputs)
-	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd $(benchmarks_protoc_inputs_proto2) )
-	touch protoc_middleman
+generate_all_gogo_benchmark_code: generate-gogo-benchmark-code make_tmp_dir_gogo
+	./generate-gogo-benchmark-code go_no_group 0
+	./generate-gogo-benchmark-code gogofast 1
+	./generate-gogo-benchmark-code gogofaster 1
+	./generate-gogo-benchmark-code gogoslick 1
+
+gogo-benchmark:
+	@echo "Writing shortcut script gogo-benchmark..."
+	@echo '#! /bin/bash' > gogo-benchmark
+	@echo 'cd tmp/$$1/benchmark_code' >> gogo-benchmark
+	@echo 'shift' >> gogo-benchmark
+	@echo 'all_data=""' >> gogo-benchmark
+	@echo 'for data_file in $$@; do all_data="$$all_data ../../../$$data_file"; done' >> gogo-benchmark
+	@echo 'go test -bench=. -- $$all_data' >> gogo-benchmark
+	@echo 'cd ../..' >> gogo-benchmark
+	@chmod +x gogo-benchmark
+
+go_no_group: go_no_group_protoc_middleman generate_gogo_data generate_all_gogo_benchmark_code gogo-benchmark
+	./gogo-benchmark go_no_group $(gogo_data)
+	
+gogofast: gogofast_protoc_middleman generate_gogo_data gogo-benchmark generate_all_gogo_benchmark_code 
+	./gogo-benchmark gogofast $(gogo_data)
+	
+gogofaster: gogofaster_protoc_middleman  generate_gogo_data gogo-benchmark generate_all_gogo_benchmark_code
+	./gogo-benchmark gogofaster $(gogo_data)
+
+gogoslick: gogoslick_protoc_middleman  generate_gogo_data gogo-benchmark generate_all_gogo_benchmark_code
+	./gogo-benchmark gogoslick $(gogo_data)
+
+
+############# GOGO RULES END ############
+
+ 
+############ UTIL RULES BEGIN ############
+
+bin_PROGRAMS += protoc-gen-gogoproto gogo-data-scrubber protoc-gen-proto2_to_proto3 proto3-data-stripper
+
+protoc_gen_gogoproto_LDADD = $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/src/libprotoc.la
+protoc_gen_gogoproto_SOURCES = util/protoc-gen-gogoproto.cc
+protoc_gen_gogoproto_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp -I$(srcdir)/util
+
+gogo_data_scrubber_LDADD = $(top_srcdir)/src/libprotobuf.la
+gogo_data_scrubber_SOURCES = util/gogo_data_scrubber.cc
+gogo_data_scrubber_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp -I$(srcdir)/util
+util/gogo_data_scrubber-gogo_data_scrubber.$(OBJEXT): $(benchmarks_protoc_outputs) $(benchmarks_protoc_outputs_proto2) $(benchmarks_protoc_outputs_header) $(benchmarks_protoc_outputs_proto2_header)
+nodist_gogo_data_scrubber_SOURCES =                                        \
+	$(benchmarks_protoc_outputs)                                             \
+	$(benchmarks_protoc_outputs_proto2)                                      \
+	$(benchmarks_protoc_outputs_proto2_header)                               \
+	$(benchmarks_protoc_outputs_header)
+
+protoc_gen_proto2_to_proto3_LDADD = $(top_srcdir)/src/libprotobuf.la $(top_srcdir)/src/libprotoc.la
+protoc_gen_proto2_to_proto3_SOURCES = util/protoc-gen-proto2_to_proto3.cc
+protoc_gen_proto2_to_proto3_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp -I$(srcdir)/util
+
+proto3_data_stripper_LDADD = $(top_srcdir)/src/libprotobuf.la
+proto3_data_stripper_SOURCES = util/proto3_data_stripper.cc
+proto3_data_stripper_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)/cpp -I$(srcdir)/util
+util/proto3_data_stripper-proto3_data_stripper.$(OBJEXT): $(benchmarks_protoc_outputs) $(benchmarks_protoc_outputs_proto2) $(benchmarks_protoc_outputs_header) $(benchmarks_protoc_outputs_proto2_header)
+nodist_proto3_data_stripper_SOURCES =                                      \
+	$(benchmarks_protoc_outputs)                                             \
+	$(benchmarks_protoc_outputs_proto2)                                      \
+	$(benchmarks_protoc_outputs_proto2_header)                               \
+	$(benchmarks_protoc_outputs_header)
+
+	
+############ UTIL RULES END ############
+
+############ PROTO3 PREPARATION BEGIN #############
+
+proto3_proto_middleman: protoc-gen-proto2_to_proto3
+	mkdir -p "tmp/proto3_proto"
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I$(srcdir) -I$(top_srcdir) --plugin=protoc-gen-proto2_to_proto3 --proto2_to_proto3_out=$$oldpwd/tmp/proto3_proto $(benchmarks_protoc_inputs) $(benchmarks_protoc_inputs_benchmark_wrapper) $(benchmarks_protoc_inputs_proto2) )
+	touch proto3_proto_middleman
+
+proto3_data = $$(for data in $(all_data); do echo "tmp/proto3_data$${data\#$(srcdir)}"; done | xargs)
+
+generate_proto3_data: protoc_middleman protoc_middleman2 proto3-data-stripper
+	mkdir -p `dirname $(proto3_data)`
+	./proto3-data-stripper $(all_data) $(proto3_data)
+	touch generate_proto3_data
+
+############ PROTO3 PREPARATION END #############
+
+MAINTAINERCLEANFILES =                                                     \
+	Makefile.in
+
+CLEANFILES =                                                               \
+	$(benchmarks_protoc_outputs)                                             \
+	$(benchmarks_protoc_outputs_header)                                      \
+	$(benchmarks_protoc_outputs_proto2)                                      \
+	$(benchmarks_protoc_outputs_proto2_header)                               \
+	initialize_submodule                                                     \
+	make_tmp_dir                                                             \
+	protoc_middleman                                                         \
+	protoc_middleman2                                                        \
+	javac_middleman                                                          \
+	java-benchmark                                                           \
+	python_cpp_proto_library                                                 \
+	python-pure-python-benchmark                                             \
+	python-cpp-reflection-benchmark                                          \
+	python-cpp-generated-code-benchmark                                      \
+	go-benchmark                                                             \
+	go_protoc_middleman                                                      \
+	make_tmp_dir_gogo                                                        \
+	gogo_proto_middleman                                                     \
+	generate_gogo_data                                                       \
+	go_no_group_protoc_middleman                                             \
+	go_no_group                                                              \
+	go-no-group-benchmark                                                    \
+	$(cpp_no_group_benchmarks_protoc_outputs_header)                         \
+	$(cpp_no_group_benchmarks_protoc_outputs)                                \
+	$(cpp_no_group_benchmarks_protoc_outputs_proto2_header)                  \
+	$(cpp_no_group_benchmarks_protoc_outputs_proto2)                         \
+	generate_all_gogo_benchmark_code                                         \
+	generate-gogo-benchmark-code                                             \
+	cpp_no_group_protoc_middleman                                            \
+	generate_cpp_no_group_benchmark_code                                     \
+	generate_gogo_benchmark_code                                             \
+	gogofast_protoc_middleman                                                \
+	gogofast                                                                 \
+	gogofaster_protoc_middleman                                              \
+	gogofaster                                                               \
+	gogoslick_protoc_middleman                                               \
+	gogoslick                                                                \
+	gogo-benchmark                                                           \
+	gogo/cpp_no_group/cpp_benchmark.*                                        \
+	proto3_proto_middleman                                                   \
+	generate_proto3_data
+	
 
-endif
+clean-local:
+	-rm -rf tmp/*
diff --git a/benchmarks/ProtoBench.java b/benchmarks/ProtoBench.java
deleted file mode 100644
index 86d62feb..00000000
--- a/benchmarks/ProtoBench.java
+++ /dev/null
@@ -1,203 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2009 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protocolbuffers;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.lang.reflect.Method;
-
-import com.google.protobuf.ByteString;
-import com.google.protobuf.CodedInputStream;
-import com.google.protobuf.CodedOutputStream;
-import com.google.protobuf.Message;
-
-public class ProtoBench {
-  
-  private static final long MIN_SAMPLE_TIME_MS = 2 * 1000;
-  private static final long TARGET_TIME_MS = 30 * 1000;
-
-  private ProtoBench() {
-    // Prevent instantiation
-  }
-  
-  public static void main(String[] args) {
-    if (args.length < 2 || (args.length % 2) != 0) {
-      System.err.println("Usage: ProtoBench <descriptor type name> <input data>");
-      System.err.println("The descriptor type name is the fully-qualified message name,");
-      System.err.println("e.g. com.google.protocolbuffers.benchmark.Message1");
-      System.err.println("(You can specify multiple pairs of descriptor type name and input data.)");
-      System.exit(1);
-    }
-    boolean success = true;
-    for (int i = 0; i < args.length; i += 2) {
-      success &= runTest(args[i], args[i + 1]);
-    }
-    System.exit(success ? 0 : 1);
-  }
-
-  /**
-   * Runs a single test. Error messages are displayed to stderr, and the return value
-   * indicates general success/failure.
-   */
-  public static boolean runTest(String type, String file) {
-    System.out.println("Benchmarking " + type + " with file " + file);
-    final Message defaultMessage;
-    try {
-      Class<?> clazz = Class.forName(type);
-      Method method = clazz.getDeclaredMethod("getDefaultInstance");
-      defaultMessage = (Message) method.invoke(null);
-    } catch (Exception e) {
-      // We want to do the same thing with all exceptions. Not generally nice,
-      // but this is slightly different.
-      System.err.println("Unable to get default message for " + type);
-      return false;
-    }
-    
-    try {
-      final byte[] inputData = readAllBytes(file);
-      final ByteArrayInputStream inputStream = new ByteArrayInputStream(inputData);
-      final ByteString inputString = ByteString.copyFrom(inputData);
-      final Message sampleMessage = defaultMessage.newBuilderForType().mergeFrom(inputString).build();
-      FileOutputStream devNullTemp = null;
-      CodedOutputStream reuseDevNullTemp = null;
-      try {
-        devNullTemp = new FileOutputStream("/dev/null");
-        reuseDevNullTemp = CodedOutputStream.newInstance(devNullTemp);
-      } catch (FileNotFoundException e) {
-        // ignore: this is probably Windows, where /dev/null does not exist
-      }
-      final FileOutputStream devNull = devNullTemp;
-      final CodedOutputStream reuseDevNull = reuseDevNullTemp;
-      benchmark("Serialize to byte string", inputData.length, new Action() {
-        public void execute() { sampleMessage.toByteString(); }
-      });      
-      benchmark("Serialize to byte array", inputData.length, new Action() {
-        public void execute() { sampleMessage.toByteArray(); }
-      });
-      benchmark("Serialize to memory stream", inputData.length, new Action() {
-        public void execute() throws IOException { 
-          sampleMessage.writeTo(new ByteArrayOutputStream()); 
-        }
-      });
-      if (devNull != null) {
-        benchmark("Serialize to /dev/null with FileOutputStream", inputData.length, new Action() {
-          public void execute() throws IOException {
-            sampleMessage.writeTo(devNull);
-          }
-        });
-        benchmark("Serialize to /dev/null reusing FileOutputStream", inputData.length, new Action() {
-          public void execute() throws IOException {
-            sampleMessage.writeTo(reuseDevNull);
-            reuseDevNull.flush();  // force the write to the OutputStream
-          }
-        });
-      }
-      benchmark("Deserialize from byte string", inputData.length, new Action() {
-        public void execute() throws IOException { 
-          defaultMessage.newBuilderForType().mergeFrom(inputString).build();
-        }
-      });
-      benchmark("Deserialize from byte array", inputData.length, new Action() {
-        public void execute() throws IOException { 
-          defaultMessage.newBuilderForType()
-            .mergeFrom(CodedInputStream.newInstance(inputData)).build();
-        }
-      });
-      benchmark("Deserialize from memory stream", inputData.length, new Action() {
-        public void execute() throws IOException { 
-          defaultMessage.newBuilderForType()
-            .mergeFrom(CodedInputStream.newInstance(inputStream)).build();
-          inputStream.reset();
-        }
-      });
-      System.out.println();
-      return true;
-    } catch (Exception e) {
-      System.err.println("Error: " + e.getMessage());
-      System.err.println("Detailed exception information:");
-      e.printStackTrace(System.err);
-      return false;
-    }
-  }
-  
-  private static void benchmark(String name, long dataSize, Action action) throws IOException {
-    // Make sure it's JITted "reasonably" hard before running the first progress test
-    for (int i=0; i < 100; i++) {
-      action.execute();
-    }
-    
-    // Run it progressively more times until we've got a reasonable sample
-    int iterations = 1;
-    long elapsed = timeAction(action, iterations);
-    while (elapsed < MIN_SAMPLE_TIME_MS) {
-      iterations *= 2;
-      elapsed = timeAction(action, iterations);
-    }
-    
-    // Upscale the sample to the target time. Do this in floating point arithmetic
-    // to avoid overflow issues.
-    iterations = (int) ((TARGET_TIME_MS / (double) elapsed) * iterations);
-    elapsed = timeAction(action, iterations);
-    System.out.println(name + ": " + iterations + " iterations in "
-         + (elapsed/1000f) + "s; " 
-         + (iterations * dataSize) / (elapsed * 1024 * 1024 / 1000f) 
-         + "MB/s");
-  }
-  
-  private static long timeAction(Action action, int iterations) throws IOException {
-    System.gc();    
-    long start = System.currentTimeMillis();
-    for (int i = 0; i < iterations; i++) {
-      action.execute();
-    }
-    long end = System.currentTimeMillis();
-    return end - start;
-  }
-  
-  private static byte[] readAllBytes(String filename) throws IOException {
-    RandomAccessFile file = new RandomAccessFile(new File(filename), "r");
-    byte[] content = new byte[(int) file.length()];
-    file.readFully(content);
-    return content;
-  }
-
-  /**
-   * Interface used to capture a single action to benchmark.
-   */
-  interface Action {
-    void execute() throws IOException;
-  }
-}
diff --git a/benchmarks/README.md b/benchmarks/README.md
index c9027805..21cd7352 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -3,23 +3,182 @@
 
 This directory contains benchmarking schemas and data sets that you
 can use to test a variety of performance scenarios against your
-protobuf language runtime.
+protobuf language runtime. If you are looking for performance 
+numbers of officially support languages, see [here](
+https://github.com/google/protobuf/blob/master/docs/Performance.md)
 
-The schema for the datasets is described in `benchmarks.proto`.
+## Prerequisite
+
+First, you need to follow the instruction in the root directory's README to
+build your language's protobuf, then:
+
+### CPP
+You need to install [cmake](https://cmake.org/) before building the benchmark.
+
+We are using [google/benchmark](https://github.com/google/benchmark) as the
+benchmark tool for testing cpp. This will be automaticly made during build the
+cpp benchmark.
+
+The cpp protobuf performance can be improved by linking with [tcmalloc library](
+https://gperftools.github.io/gperftools/tcmalloc.html). For using tcmalloc, you
+need to build [gpertools](https://github.com/gperftools/gperftools) to generate
+libtcmallc.so library.
+
+### Java
+We're using maven to build the java benchmarks, which is the same as to build
+the Java protobuf. There're no other tools need to install. We're using
+[google/caliper](https://github.com/google/caliper) as benchmark tool, which
+can be automaticly included by maven.
+
+### Python
+We're using python C++ API for testing the generated
+CPP proto version of python protobuf, which is also a prerequisite for Python
+protobuf cpp implementation. You need to install the correct version of Python
+C++ extension package before run generated CPP proto version of Python
+protobuf's benchmark. e.g. under Ubuntu, you need to
+
+```
+$ sudo apt-get install python-dev
+$ sudo apt-get install python3-dev
+```
+And you also need to make sure `pkg-config` is installed.
+
+### Go
+Go protobufs are maintained at [github.com/golang/protobuf](
+http://github.com/golang/protobuf). If not done already, you need to install the 
+toolchain and the Go protoc-gen-go plugin for protoc. 
 
-Generate the data sets like so:
+To install protoc-gen-go, run:
 
 ```
-$ make
-$ ./generate-datasets
-Wrote dataset: dataset.google_message1_proto3.pb
-Wrote dataset: dataset.google_message1_proto2.pb
-Wrote dataset: dataset.google_message2.pb
-$
+$ go get -u github.com/golang/protobuf/protoc-gen-go
+$ export PATH=$PATH:$(go env GOPATH)/bin
+```
+
+The first command installs `protoc-gen-go` into the `bin` directory in your local `GOPATH`.
+The second command adds the `bin` directory to your `PATH` so that `protoc` can locate the plugin later.
+
+### Big data
+
+There's some optional big testing data which is not included in the directory
+initially, you need to run the following command to download the testing data:
+
+```
+$ ./download_data.sh
+```
+
+After doing this the big data file will automaticly generated in the
+benchmark directory.
+
+## Run instructions
+
+To run all the benchmark dataset:
+
+### Java:
+
+```
+$ make java
+```
+
+### CPP:
+
+```
+$ make cpp
+```
+
+For linking with tcmalloc:
+
+```
+$ env LD_PRELOAD={directory to libtcmalloc.so} make cpp
+```
+
+### Python:
+
+We have three versions of python protobuf implementation: pure python, cpp
+reflection and cpp generated code. To run these version benchmark, you need to:
+
+#### Pure Python:
+
+```
+$ make python-pure-python
+```
+
+#### CPP reflection:
+
 ```
+$ make python-cpp-reflection
+```
+
+#### CPP generated code:
+
+```
+$ make python-cpp-generated-code
+```
+
+### Go
+```
+$ make go
+```
+
+To run a specific dataset or run with specific options:
+
+### Java:
+
+```
+$ make java-benchmark
+$ ./java-benchmark $(specific generated dataset file name) [$(caliper options)]
+```
+
+### CPP:
+
+```
+$ make cpp-benchmark
+$ ./cpp-benchmark $(specific generated dataset file name) [$(benchmark options)]
+```
+
+### Python:
+
+For Python benchmark we have `--json` for outputing the json result
+
+#### Pure Python:
+
+```
+$ make python-pure-python-benchmark
+$ ./python-pure-python-benchmark [--json] $(specific generated dataset file name)
+```
+
+#### CPP reflection:
+
+```
+$ make python-cpp-reflection-benchmark
+$ ./python-cpp-reflection-benchmark [--json] $(specific generated dataset file name)
+```
+
+#### CPP generated code:
+
+```
+$ make python-cpp-generated-code-benchmark
+$ ./python-cpp-generated-code-benchmark [--json] $(specific generated dataset file name)
+```
+
+### Go:
+```
+$ make go-benchmark
+$ ./go-benchmark $(specific generated dataset file name) [go testing options]
+```
+
+
+## Benchmark datasets
+
+Each data set is in the format of benchmarks.proto:
+
+1. name is the benchmark dataset's name.
+2. message_name is the benchmark's message type full name (including package and message name)
+3. payload is the list of raw data.
+
+The schema for the datasets is described in `benchmarks.proto`.
 
-Each data set will be written to its own file.  Benchmarks will
-likely want to run several benchmarks against each data set (parse,
+Benchmark likely want to run several benchmarks against each data set (parse,
 serialize, possibly JSON, possibly using different APIs, etc).
 
 We would like to add more data sets.  In general we will favor data sets
diff --git a/benchmarks/__init__.py b/benchmarks/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/benchmarks/__init__.py
diff --git a/benchmarks/benchmark_messages_proto2.proto b/benchmarks/benchmark_messages_proto2.proto
deleted file mode 100644
index 59085503..00000000
--- a/benchmarks/benchmark_messages_proto2.proto
+++ /dev/null
@@ -1,143 +0,0 @@
-// Benchmark messages for proto2.
-
-syntax = "proto2";
-
-package benchmarks.proto2;
-option java_package = "com.google.protobuf.benchmarks";
-
-// This is the default, but we specify it here explicitly.
-option optimize_for = SPEED;
-
-option cc_enable_arenas = true;
-
-message GoogleMessage1 {
-  required string field1 = 1;
-  optional string field9 = 9;
-  optional string field18 = 18;
-  optional bool field80 = 80 [default=false];
-  optional bool field81 = 81 [default=true];
-  required int32 field2 = 2;
-  required int32 field3 = 3;
-  optional int32 field280 = 280;
-  optional int32 field6 = 6 [default=0];
-  optional int64 field22 = 22;
-  optional string field4 = 4;
-  repeated fixed64 field5 = 5;
-  optional bool field59 = 59 [default=false];
-  optional string field7 = 7;
-  optional int32 field16 = 16;
-  optional int32 field130 = 130 [default=0];
-  optional bool field12 = 12 [default=true];
-  optional bool field17 = 17 [default=true];
-  optional bool field13 = 13 [default=true];
-  optional bool field14 = 14 [default=true];
-  optional int32 field104 = 104 [default=0];
-  optional int32 field100 = 100 [default=0];
-  optional int32 field101 = 101 [default=0];
-  optional string field102 = 102;
-  optional string field103 = 103;
-  optional int32 field29 = 29 [default=0];
-  optional bool field30 = 30 [default=false];
-  optional int32 field60 = 60 [default=-1];
-  optional int32 field271 = 271 [default=-1];
-  optional int32 field272 = 272 [default=-1];
-  optional int32 field150 = 150;
-  optional int32 field23 = 23 [default=0];
-  optional bool field24 = 24 [default=false];
-  optional int32 field25 = 25 [default=0];
-  optional GoogleMessage1SubMessage field15 = 15;
-  optional bool field78 = 78;
-  optional int32 field67 = 67 [default=0];
-  optional int32 field68 = 68;
-  optional int32 field128 = 128 [default=0];
-  optional string field129 = 129 [default="xxxxxxxxxxxxxxxxxxxxx"];
-  optional int32 field131 = 131 [default=0];
-}
-
-message GoogleMessage1SubMessage {
-  optional int32 field1 = 1 [default=0];
-  optional int32 field2 = 2 [default=0];
-  optional int32 field3 = 3 [default=0];
-  optional string field15 = 15;
-  optional bool field12 = 12 [default=true];
-  optional int64 field13 = 13;
-  optional int64 field14 = 14;
-  optional int32 field16 = 16;
-  optional int32 field19 = 19 [default=2];
-  optional bool field20  = 20 [default=true];
-  optional bool field28 = 28 [default=true];
-  optional fixed64 field21 = 21;
-  optional int32 field22 = 22;
-  optional bool field23 = 23 [ default=false ];
-  optional bool field206 = 206 [default=false];
-  optional fixed32 field203 = 203;
-  optional int32 field204 = 204;
-  optional string field205 = 205;
-  optional uint64 field207 = 207;
-  optional uint64 field300 = 300;
-}
-
-message GoogleMessage2 {
-  optional string field1 = 1;
-  optional int64 field3 = 3;
-  optional int64 field4 = 4;
-  optional int64 field30 = 30;
-  optional bool field75  = 75 [default=false];
-  optional string field6 = 6;
-  optional bytes field2 = 2;
-  optional int32 field21 = 21 [default=0];
-  optional int32 field71 = 71;
-  optional float field25 = 25;
-  optional int32 field109 = 109 [default=0];
-  optional int32 field210 = 210 [default=0];
-  optional int32 field211 = 211 [default=0];
-  optional int32 field212 = 212 [default=0];
-  optional int32 field213 = 213 [default=0];
-  optional int32 field216 = 216 [default=0];
-  optional int32 field217 = 217 [default=0];
-  optional int32 field218 = 218 [default=0];
-  optional int32 field220 = 220 [default=0];
-  optional int32 field221 = 221 [default=0];
-  optional float field222 = 222 [default=0.0];
-  optional int32 field63 = 63;
-
-  repeated group Group1 = 10 {
-    required float field11 = 11;
-    optional float field26 = 26;
-    optional string field12 = 12;
-    optional string field13 = 13;
-    repeated string field14 = 14;
-    required uint64 field15 = 15;
-    optional int32 field5 = 5;
-    optional string field27 = 27;
-    optional int32 field28 = 28;
-    optional string field29 = 29;
-    optional string field16 = 16;
-    repeated string field22 = 22;
-    repeated int32 field73 = 73;
-    optional int32 field20 = 20 [default=0];
-    optional string field24 = 24;
-    optional GoogleMessage2GroupedMessage field31 = 31;
-  }
-  repeated string field128 = 128;
-  optional int64 field131 = 131;
-  repeated string field127 = 127;
-  optional int32 field129 = 129;
-  repeated int64 field130 = 130;
-  optional bool field205 = 205 [default=false];
-  optional bool field206 = 206 [default=false];
-}
-
-message GoogleMessage2GroupedMessage {
-  optional float field1 = 1;
-  optional float field2 = 2;
-  optional float field3 = 3 [default=0.0];
-  optional bool field4 = 4;
-  optional bool field5 = 5;
-  optional bool field6 = 6 [default=true];
-  optional bool field7 = 7 [default=false];
-  optional float field8 = 8;
-  optional bool field9 = 9;
-  optional float field10 = 10;
-  optional int64 field11 = 11;
-}
diff --git a/benchmarks/cpp_benchmark.cc b/benchmarks/cpp/cpp_benchmark.cc
index 0e6febc2..f8b55291 100644
--- a/benchmarks/cpp_benchmark.cc
+++ b/benchmarks/cpp/cpp_benchmark.cc
@@ -28,13 +28,16 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <glob.h>
-#include <iostream>
 #include <fstream>
+#include <iostream>
 #include "benchmark/benchmark_api.h"
 #include "benchmarks.pb.h"
-#include "benchmark_messages_proto2.pb.h"
-#include "benchmark_messages_proto3.pb.h"
+#include "datasets/google_message1/proto2/benchmark_message1_proto2.pb.h"
+#include "datasets/google_message1/proto3/benchmark_message1_proto3.pb.h"
+#include "datasets/google_message2/benchmark_message2.pb.h"
+#include "datasets/google_message3/benchmark_message3.pb.h"
+#include "datasets/google_message4/benchmark_message4.pb.h"
+
 
 #define PREFIX "dataset."
 #define SUFFIX ".pb"
@@ -118,9 +121,10 @@ class ParseNewArenaFixture : public Fixture {
   virtual void BenchmarkCase(benchmark::State& state) {
     WrappingCounter i(payloads_.size());
     size_t total = 0;
+    Arena arena;
 
     while (state.KeepRunning()) {
-      Arena arena;
+      arena.Reset();
       Message* m = Arena::CreateMessage<T>(&arena);
       const std::string& payload = payloads_[i.Next()];
       total += payload.size();
@@ -219,6 +223,14 @@ void RegisterBenchmarks(const std::string& dataset_bytes) {
     RegisterBenchmarksForType<benchmarks::proto2::GoogleMessage1>(dataset);
   } else if (dataset.message_name() == "benchmarks.proto2.GoogleMessage2") {
     RegisterBenchmarksForType<benchmarks::proto2::GoogleMessage2>(dataset);
+  } else if (dataset.message_name() ==
+      "benchmarks.google_message3.GoogleMessage3") {
+    RegisterBenchmarksForType
+    <benchmarks::google_message3::GoogleMessage3>(dataset);
+  } else if (dataset.message_name() ==
+      "benchmarks.google_message4.GoogleMessage4") {
+    RegisterBenchmarksForType
+    <benchmarks::google_message4::GoogleMessage4>(dataset);
   } else {
     std::cerr << "Unknown message type: " << dataset.message_name();
     exit(1);
@@ -226,17 +238,17 @@ void RegisterBenchmarks(const std::string& dataset_bytes) {
 }
 
 int main(int argc, char *argv[]) {
-  glob_t glob_result;
-  if (glob("dataset.*.pb", 0, NULL, &glob_result) != 0) {
-    fprintf(stderr, "No dataset files found.\n");
+  ::benchmark::Initialize(&argc, argv);
+  if (argc == 1) {
+    std::cerr << "Usage: ./cpp-benchmark <input data>" << std::endl;
+    std::cerr << "input data is in the format of \"benchmarks.proto\""
+        << std::endl;
     return 1;
+  } else {
+    for (int i = 1; i < argc; i++) {
+      RegisterBenchmarks(ReadFile(argv[i]));
+    }
   }
 
-  for (size_t i = 0; i < glob_result.gl_pathc; i++) {
-    fprintf(stderr, "Found input dataset: %s\n", glob_result.gl_pathv[i]);
-    RegisterBenchmarks(ReadFile(glob_result.gl_pathv[i]));
-  }
-
-  ::benchmark::Initialize(&argc, argv);
   ::benchmark::RunSpecifiedBenchmarks();
 }
diff --git a/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.proto b/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.proto
new file mode 100644
index 00000000..21261905
--- /dev/null
+++ b/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.proto
@@ -0,0 +1,78 @@
+// Benchmark messages for proto2.
+
+syntax = "proto2";
+
+package benchmarks.proto2;
+option java_package = "com.google.protobuf.benchmarks";
+
+// This is the default, but we specify it here explicitly.
+option optimize_for = SPEED;
+
+option cc_enable_arenas = true;
+
+message GoogleMessage1 {
+  required string field1 = 1;
+  optional string field9 = 9;
+  optional string field18 = 18;
+  optional bool field80 = 80 [default = false];
+  optional bool field81 = 81 [default = true];
+  required int32 field2 = 2;
+  required int32 field3 = 3;
+  optional int32 field280 = 280;
+  optional int32 field6 = 6 [default = 0];
+  optional int64 field22 = 22;
+  optional string field4 = 4;
+  repeated fixed64 field5 = 5;
+  optional bool field59 = 59 [default = false];
+  optional string field7 = 7;
+  optional int32 field16 = 16;
+  optional int32 field130 = 130 [default = 0];
+  optional bool field12 = 12 [default = true];
+  optional bool field17 = 17 [default = true];
+  optional bool field13 = 13 [default = true];
+  optional bool field14 = 14 [default = true];
+  optional int32 field104 = 104 [default = 0];
+  optional int32 field100 = 100 [default = 0];
+  optional int32 field101 = 101 [default = 0];
+  optional string field102 = 102;
+  optional string field103 = 103;
+  optional int32 field29 = 29 [default = 0];
+  optional bool field30 = 30 [default = false];
+  optional int32 field60 = 60 [default = -1];
+  optional int32 field271 = 271 [default = -1];
+  optional int32 field272 = 272 [default = -1];
+  optional int32 field150 = 150;
+  optional int32 field23 = 23 [default = 0];
+  optional bool field24 = 24 [default = false];
+  optional int32 field25 = 25 [default = 0];
+  optional GoogleMessage1SubMessage field15 = 15;
+  optional bool field78 = 78;
+  optional int32 field67 = 67 [default = 0];
+  optional int32 field68 = 68;
+  optional int32 field128 = 128 [default = 0];
+  optional string field129 = 129 [default = "xxxxxxxxxxxxxxxxxxxxx"];
+  optional int32 field131 = 131 [default = 0];
+}
+
+message GoogleMessage1SubMessage {
+  optional int32 field1 = 1 [default = 0];
+  optional int32 field2 = 2 [default = 0];
+  optional int32 field3 = 3 [default = 0];
+  optional string field15 = 15;
+  optional bool field12 = 12 [default = true];
+  optional int64 field13 = 13;
+  optional int64 field14 = 14;
+  optional int32 field16 = 16;
+  optional int32 field19 = 19 [default = 2];
+  optional bool field20 = 20 [default = true];
+  optional bool field28 = 28 [default = true];
+  optional fixed64 field21 = 21;
+  optional int32 field22 = 22;
+  optional bool field23 = 23 [default = false];
+  optional bool field206 = 206 [default = false];
+  optional fixed32 field203 = 203;
+  optional int32 field204 = 204;
+  optional string field205 = 205;
+  optional uint64 field207 = 207;
+  optional uint64 field300 = 300;
+}
diff --git a/benchmarks/google_message1.dat b/benchmarks/datasets/google_message1/proto2/dataset.google_message1_proto2.pb
index bc0f064c..f6fe7848 100644
--- a/benchmarks/google_message1.dat
+++ b/benchmarks/datasets/google_message1/proto2/dataset.google_message1_proto2.pb
diff --git a/benchmarks/benchmark_messages_proto3.proto b/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.proto
index 090b554b..090b554b 100644
--- a/benchmarks/benchmark_messages_proto3.proto
+++ b/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.proto
diff --git a/benchmarks/datasets/google_message1/proto3/dataset.google_message1_proto3.pb b/benchmarks/datasets/google_message1/proto3/dataset.google_message1_proto3.pb
new file mode 100644
index 00000000..4955bed3
--- /dev/null
+++ b/benchmarks/datasets/google_message1/proto3/dataset.google_message1_proto3.pb
diff --git a/benchmarks/datasets/google_message2/benchmark_message2.proto b/benchmarks/datasets/google_message2/benchmark_message2.proto
new file mode 100644
index 00000000..820630e4
--- /dev/null
+++ b/benchmarks/datasets/google_message2/benchmark_message2.proto
@@ -0,0 +1,76 @@
+// Benchmark messages for proto2.
+
+syntax = "proto2";
+
+package benchmarks.proto2;
+option java_package = "com.google.protobuf.benchmarks";
+
+// This is the default, but we specify it here explicitly.
+option optimize_for = SPEED;
+
+option cc_enable_arenas = true;
+
+message GoogleMessage2 {
+  optional string field1 = 1;
+  optional int64 field3 = 3;
+  optional int64 field4 = 4;
+  optional int64 field30 = 30;
+  optional bool field75 = 75 [default = false];
+  optional string field6 = 6;
+  optional bytes field2 = 2;
+  optional int32 field21 = 21 [default = 0];
+  optional int32 field71 = 71;
+  optional float field25 = 25;
+  optional int32 field109 = 109 [default = 0];
+  optional int32 field210 = 210 [default = 0];
+  optional int32 field211 = 211 [default = 0];
+  optional int32 field212 = 212 [default = 0];
+  optional int32 field213 = 213 [default = 0];
+  optional int32 field216 = 216 [default = 0];
+  optional int32 field217 = 217 [default = 0];
+  optional int32 field218 = 218 [default = 0];
+  optional int32 field220 = 220 [default = 0];
+  optional int32 field221 = 221 [default = 0];
+  optional float field222 = 222 [default = 0.0];
+  optional int32 field63 = 63;
+
+  repeated group Group1 = 10 {
+    required float field11 = 11;
+    optional float field26 = 26;
+    optional string field12 = 12;
+    optional string field13 = 13;
+    repeated string field14 = 14;
+    required uint64 field15 = 15;
+    optional int32 field5 = 5;
+    optional string field27 = 27;
+    optional int32 field28 = 28;
+    optional string field29 = 29;
+    optional string field16 = 16;
+    repeated string field22 = 22;
+    repeated int32 field73 = 73;
+    optional int32 field20 = 20 [default = 0];
+    optional string field24 = 24;
+    optional GoogleMessage2GroupedMessage field31 = 31;
+  }
+  repeated string field128 = 128;
+  optional int64 field131 = 131;
+  repeated string field127 = 127;
+  optional int32 field129 = 129;
+  repeated int64 field130 = 130;
+  optional bool field205 = 205 [default = false];
+  optional bool field206 = 206 [default = false];
+}
+
+message GoogleMessage2GroupedMessage {
+  optional float field1 = 1;
+  optional float field2 = 2;
+  optional float field3 = 3 [default = 0.0];
+  optional bool field4 = 4;
+  optional bool field5 = 5;
+  optional bool field6 = 6 [default = true];
+  optional bool field7 = 7 [default = false];
+  optional float field8 = 8;
+  optional bool field9 = 9;
+  optional float field10 = 10;
+  optional int64 field11 = 11;
+}
diff --git a/benchmarks/google_message2.dat b/benchmarks/datasets/google_message2/dataset.google_message2.pb
index 06c09441..3fa0e49e 100644
--- a/benchmarks/google_message2.dat
+++ b/benchmarks/datasets/google_message2/dataset.google_message2.pb
diff --git a/benchmarks/datasets/google_message3/benchmark_message3.proto b/benchmarks/datasets/google_message3/benchmark_message3.proto
new file mode 100644
index 00000000..d6f0d14e
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3.proto
@@ -0,0 +1,534 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_1.proto";
+import "datasets/google_message3/benchmark_message3_2.proto";
+import "datasets/google_message3/benchmark_message3_3.proto";
+import "datasets/google_message3/benchmark_message3_4.proto";
+import "datasets/google_message3/benchmark_message3_5.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message GoogleMessage3 {
+  optional .benchmarks.google_message3.Message37487 field37519 = 2;
+  optional .benchmarks.google_message3.Message36876 field37520 = 3;
+  optional .benchmarks.google_message3.Message13062 field37521 = 4;
+  optional .benchmarks.google_message3.Message952 field37522 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37523 = 6;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37524 = 7;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37525 = 8;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37526 = 9;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37527 = 10;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37528 = 11;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37529 = 12;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37530 = 13;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37531 = 14;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37532 = 15;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37533 = 16;
+}
+
+message Message1327 {
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field1369 = 1;
+  repeated .benchmarks.google_message3.Message1328 field1370 = 3;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field1371 = 5;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field1372 = 6;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message1327 field1373 = 23104162;
+  }
+}
+
+message Message3672 {
+  optional .benchmarks.google_message3.Enum3476 field3727 = 1;
+  optional int32 field3728 = 11;
+  optional int32 field3729 = 2;
+  repeated group Message3673 = 3 {
+    required .benchmarks.google_message3.Enum3476 field3738 = 4;
+    required int32 field3739 = 5;
+  }
+  repeated group Message3674 = 6 {
+    required .benchmarks.google_message3.Enum3476 field3740 = 7;
+    required int32 field3741 = 8;
+  }
+  optional bool field3732 = 9;
+  optional int32 field3733 = 10;
+  optional .benchmarks.google_message3.Enum3476 field3734 = 20;
+  optional int32 field3735 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field3736 = 50;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message3672 field3737 = 3144435;
+  }
+}
+
+message Message3804 {
+  required int64 field3818 = 1;
+  required bool field3819 = 2;
+  repeated .benchmarks.google_message3.Enum3805 field3820 = 4;
+  optional int32 field3821 = 5;
+  optional bool field3822 = 6;
+  optional int64 field3823 = 7;
+  optional .benchmarks.google_message3.Enum3783 field3824 = 8;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message3804 field3825 = 59241828;
+  }
+}
+
+message Message6849 {
+  repeated .benchmarks.google_message3.Message6850 field6910 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message6849 field6911 = 107558455;
+  }
+}
+
+message Message6866 {
+  repeated .benchmarks.google_message3.Message6863 field6973 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message6866 field6974 = 22259060;
+  }
+}
+
+message Message6870 {
+  repeated .benchmarks.google_message3.Message6871 field6991 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message6870 field6992 = 90034652;
+  }
+}
+
+message Message7651 {
+  optional string field7685 = 1;
+  optional int64 field7686 = 2;
+  optional int64 field7687 = 3;
+  optional int64 field7688 = 4;
+  optional int32 field7689 = 5;
+  optional int32 field7690 = 6;
+  optional int32 field7691 = 7;
+  optional int32 field7692 = 8;
+  optional int32 field7693 = 9;
+  optional int32 field7694 = 10;
+  optional int32 field7695 = 11;
+  optional int32 field7696 = 12;
+  optional int32 field7697 = 13;
+  optional int32 field7698 = 14;
+  optional int32 field7699 = 15;
+  optional int32 field7700 = 16;
+  optional int32 field7701 = 17;
+  optional int32 field7702 = 18;
+  optional bool field7703 = 19;
+  repeated int32 field7704 = 20;
+  repeated int32 field7705 = 21;
+  repeated string field7706 = 22;
+  repeated string field7707 = 23;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field7708 = 24;
+  optional int32 field7709 = 25;
+  optional int32 field7710 = 26;
+  optional int32 field7711 = 27;
+  optional int32 field7712 = 43;
+  optional int32 field7713 = 28;
+  optional int32 field7714 = 29;
+  repeated .benchmarks.google_message3.Message7547 field7715 = 30;
+  repeated .benchmarks.google_message3.Message7547 field7716 = 31;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field7717 = 32;
+  repeated string field7718 = 33;
+  repeated string field7719 = 34;
+  repeated .benchmarks.google_message3.Message7648 field7720 = 35;
+  optional bool field7721 = 36;
+  optional bool field7722 = 37;
+  optional bool field7723 = 38;
+  optional bool field7724 = 39;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field7725 = 40;
+  optional .benchmarks.google_message3.UnusedEnum field7726 = 41;
+  optional .benchmarks.google_message3.Enum7654 field7727 = 42;
+  optional string field7728 = 44;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field7729 = 45;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message7651 field7730 = 55876009;
+  }
+}
+
+message Message7864 {
+  optional string field7866 = 1;
+  optional string field7867 = 2;
+  repeated .benchmarks.google_message3.Message7865 field7868 = 5;
+  repeated .benchmarks.google_message3.Message7865 field7869 = 6;
+  repeated .benchmarks.google_message3.Message7865 field7870 = 7;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field7871 = 8;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message7864 field7872 = 44542730;
+  }
+}
+
+message Message7929 {
+  optional int64 field7942 = 1;
+  optional int64 field7943 = 4;
+  optional int64 field7944 = 5;
+  optional int64 field7945 = 12;
+  optional int64 field7946 = 13;
+  optional int64 field7947 = 18;
+  optional int64 field7948 = 6;
+  optional int64 field7949 = 7;
+  repeated .benchmarks.google_message3.Message7919 field7950 = 8;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field7951 = 20;
+  repeated .benchmarks.google_message3.Message7920 field7952 = 14;
+  repeated .benchmarks.google_message3.Message7921 field7953 = 15;
+  repeated .benchmarks.google_message3.Message7928 field7954 = 17;
+  optional int64 field7955 = 19;
+  optional bool field7956 = 2;
+  optional int64 field7957 = 3;
+  optional int64 field7958 = 9;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field7959 = 10;
+  repeated bytes field7960 = 11;
+  optional int64 field7961 = 16;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message7929 field7962 = 53392238;
+  }
+}
+
+message Message8508 {
+  repeated .benchmarks.google_message3.Message8511 field8517 = 8;
+  repeated .benchmarks.google_message3.Message8512 field8518 = 9;
+  repeated .benchmarks.google_message3.Message8513 field8519 = 11;
+  optional bool field8520 = 13;
+  optional .benchmarks.google_message3.Message8514 field8521 = 14;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8522 = 15;
+  repeated .benchmarks.google_message3.Message8515 field8523 = 16;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8524 = 17;
+  optional int64 field8525 = 1;
+  optional float field8526 = 2;
+  optional int64 field8527 = 3;
+  optional int64 field8528 = 4;
+  optional int32 field8529 = 5;
+  optional bytes field8530 = 6;
+  repeated bytes field8531 = 7;
+  optional bool field8532 = 10;
+  optional bytes field8533 = 12;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message8508 field8534 = 3811804;
+  }
+}
+
+message Message9122 {
+  optional float field9132 = 1;
+  optional float field9133 = 2;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message9122 field9134 = 120398939;
+  }
+}
+
+message Message10177 {
+  repeated .benchmarks.google_message3.Message10155 field10270 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message10177 field10271 = 26801105;
+  }
+}
+
+message Message10278 {
+  repeated int32 field10286 = 1 [packed = true];
+  repeated int32 field10287 = 2 [packed = true];
+  optional int32 field10288 = 3;
+  extend .benchmarks.google_message3.Message10155 {
+    optional .benchmarks.google_message3.Message10278 field10289 = 29374161;
+  }
+}
+
+message Message10323 {
+  repeated .benchmarks.google_message3.Message10320 field10360 = 1;
+  extend .benchmarks.google_message3.Message10155 {
+    optional .benchmarks.google_message3.Message10323 field10361 = 27922524;
+  }
+}
+
+message Message10324 {
+  repeated .benchmarks.google_message3.Message10322 field10362 = 1;
+  optional .benchmarks.google_message3.Message10321 field10363 = 2;
+  extend .benchmarks.google_message3.Message10155 {
+    optional .benchmarks.google_message3.Message10324 field10364 = 27832297;
+  }
+}
+
+message Message11990 {
+  repeated .benchmarks.google_message3.Message11988 field12030 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message11990 field12031 = 21265426;
+  }
+}
+
+message Message12691 {
+  optional string field12713 = 1;
+  optional int32 field12714 = 2;
+  optional .benchmarks.google_message3.Message12668 field12715 = 3;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message12691 field12716 = 28426536;
+  }
+}
+
+message Message12870 {
+  required int32 field12879 = 1;
+  optional int32 field12880 = 7;
+  required int32 field12881 = 2;
+  optional uint64 field12882 = 3;
+  optional string field12883 = 2001;
+  optional fixed64 field12884 = 4;
+  repeated fixed64 field12885 = 14;
+  optional int32 field12886 = 9;
+  optional int64 field12887 = 18;
+  repeated .benchmarks.google_message3.Message12870 field12888 = 8;
+  optional int32 field12889 = 5;
+  optional uint64 field12890 = 6;
+  optional int32 field12891 = 10;
+  optional int32 field12892 = 11;
+  optional double field12893 = 12;
+  optional .benchmarks.google_message3.Message12825 field12894 = 13;
+  optional double field12895 = 15;
+  optional string field12896 = 16;
+  optional .benchmarks.google_message3.Enum12871 field12897 = 17;
+  optional int32 field12898 = 19;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message12870 field12899 = 5447656;
+  }
+}
+
+message Message13154 {
+  required float field13164 = 1;
+  required float field13165 = 2;
+  extend .benchmarks.google_message3.Message13145 {
+    optional .benchmarks.google_message3.Message13154 field13166 = 47301086;
+  }
+}
+
+message Message16507 {
+  optional bool field16510 = 3;
+  optional bool field16511 = 4;
+  optional bool field16512 = 14;
+  repeated string field16513 = 5;
+  repeated string field16514 = 6;
+  optional string field16515 = 8;
+  repeated int32 field16516 = 9;
+  repeated int32 field16517 = 10;
+  optional int32 field16518 = 7;
+  optional string field16519 = 15;
+  repeated string field16520 = 11;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16521 = 27;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16522 = 22;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16523 = 28;
+  optional string field16524 = 18;
+  optional int32 field16525 = 19;
+  optional int32 field16526 = 20;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field16527 = 23;
+  optional bool field16528 = 24;
+  repeated string field16529 = 25;
+  optional double field16530 = 26;
+  optional .benchmarks.google_message3.Message16478 field16531 = 30;
+  optional bool field16532 = 31;
+  optional string field16533 = 32;
+  optional bool field16534 = 33;
+  optional bool field16535 = 35;
+  optional bool field16536 = 36;
+  optional bool field16537 = 37;
+  optional bool field16538 = 38;
+  optional bool field16539 = 39;
+  optional bool field16540 = 40;
+  repeated string field16541 = 41;
+  extensions 21 to 21;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message16507 field16542 = 5569941;
+  }
+}
+
+message Message16564 {
+  repeated .benchmarks.google_message3.Message16552 field16568 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message16564 field16569 = 25830030;
+  }
+}
+
+message Message16661 {
+  repeated .benchmarks.google_message3.Message16660 field16671 = 1;
+  repeated uint64 field16672 = 2;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message16661 field16673 = 31274398;
+  }
+}
+
+message Message16746 {
+  repeated .benchmarks.google_message3.Message16727 field16806 = 1;
+  optional bool field16807 = 2;
+  optional bool field16808 = 3;
+  repeated .benchmarks.google_message3.Message16725 field16809 = 4;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message16746 field16810 = 28406765;
+  }
+}
+
+message Message17786 {
+  repeated group Message17787 = 1 {
+    required int32 field18177 = 2;
+    required int32 field18178 = 3;
+    optional .benchmarks.google_message3.Message17783 field18179 = 4;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18180 = 5;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18181 = 6;
+    repeated .benchmarks.google_message3.UnusedEmptyMessage field18182 = 8;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18183 = 9;
+    optional .benchmarks.google_message3.Message17726 field18184 = 10;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18185 = 11;
+    optional .benchmarks.google_message3.Message16945 field18186 = 102;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18187 = 12;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18188 = 13;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18189 = 7;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18190 = 100;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18191 = 101;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18192 = 14;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18193 = 19;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18194 = 22;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18195 = 24;
+    optional .benchmarks.google_message3.Enum16925 field18196 = 21;
+    optional bool field18197 = 18;
+    repeated .benchmarks.google_message3.UnusedEnum field18198 = 23;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18199 = 15;
+    optional string field18200 = 16;
+    optional string field18201 = 17;
+    optional bool field18202 = 99;
+  }
+  repeated .benchmarks.google_message3.Message17782 field18175 = 20;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message17786 field18176 = 11823055;
+  }
+}
+
+message Message22857 {
+  repeated .benchmarks.google_message3.Message22853 field22874 = 1;
+  extend .benchmarks.google_message3.Message10155 {
+    optional .benchmarks.google_message3.Message22857 field22875 = 67799715;
+  }
+}
+
+message Message24404 {
+  repeated group Message24405 = 1 {
+    required int32 field24686 = 2;
+    required int32 field24687 = 3;
+    optional .benchmarks.google_message3.Message24317 field24688 = 4;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24689 = 5;
+    optional .benchmarks.google_message3.Message24376 field24690 = 6;
+    optional .benchmarks.google_message3.Message24345 field24691 = 7;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24692 = 8;
+    optional .benchmarks.google_message3.Message24379 field24693 = 9;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24694 = 10;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24695 = 11;
+    optional .benchmarks.google_message3.Message24391 field24696 = 12;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24697 = 13;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24698 = 14;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24699 = 22;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24700 = 23;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24701 = 25;
+    optional .benchmarks.google_message3.Enum16925 field24702 = 18;
+    optional float field24703 = 20;
+    optional bool field24704 = 19;
+    repeated .benchmarks.google_message3.Enum16891 field24705 = 24;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field24706 = 15;
+    optional string field24707 = 16;
+    optional string field24708 = 17;
+    optional float field24709 = 21;
+    optional bool field24710 = 26;
+    optional .benchmarks.google_message3.UnusedEnum field24711 = 27;
+    optional bool field24712 = 28;
+    optional .benchmarks.google_message3.UnusedEnum field24713 = 29;
+    optional bool field24714 = 31;
+    optional bool field24715 = 99;
+    optional int64 field24716 = 32;
+  }
+  optional .benchmarks.google_message3.Message24403 field24684 = 30;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message24404 field24685 = 9129287;
+  }
+}
+
+message Message27300 {
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field27302 = 1;
+  optional string field27303 = 2;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message27300 field27304 = 24956467;
+  }
+}
+
+message Message27453 {
+  optional string field27459 = 15;
+  repeated string field27460 = 1;
+  repeated float field27461 = 6;
+  repeated int32 field27462 = 27;
+  repeated int32 field27463 = 28;
+  repeated .benchmarks.google_message3.Message27454 field27464 = 24;
+  repeated string field27465 = 2;
+  repeated float field27466 = 7;
+  repeated string field27467 = 22;
+  repeated string field27468 = 23;
+  optional string field27469 = 26;
+  repeated .benchmarks.google_message3.Message27357 field27470 = 8;
+  optional .benchmarks.google_message3.Message27360 field27471 = 16;
+  optional string field27472 = 25;
+  optional string field27473 = 11;
+  optional bool field27474 = 13;
+  optional bool field27475 = 14;
+  optional bool field27476 = 17;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field27477 = 12;
+  optional bool field27478 = 34268945;
+  optional bool field27479 = 20;
+  optional string field27480 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field27481 = 10;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message27453 field27482 = 8086204;
+  }
+}
+
+extend .benchmarks.google_message3.Message16945 {
+  optional string field17026 = 472;
+  repeated string field17027 = 818;
+  optional .benchmarks.google_message3.Message0 field17031 = 215;
+  repeated .benchmarks.google_message3.Message0 field17032 = 292;
+  repeated .benchmarks.google_message3.Message0 field17038 = 234;
+  repeated .benchmarks.google_message3.Message0 field17039 = 235;
+  optional .benchmarks.google_message3.Message0 field17042 = 246;
+  optional string field17043 = 224;
+  optional string field17044 = 225;
+  repeated string field17048 = 63;
+  repeated string field17049 = 64;
+  repeated .benchmarks.google_message3.Message0 field17052 = 233;
+  repeated .benchmarks.google_message3.Message0 field17053 = 66;
+  repeated string field17056 = 275;
+  optional string field17057 = 226;
+  repeated .benchmarks.google_message3.Message0 field17060 = 27;
+  repeated string field17073 = 75;
+  repeated .benchmarks.google_message3.Message0 field17076 = 77;
+  repeated string field17078 = 296;
+  repeated .benchmarks.google_message3.Message0 field17082 = 160;
+  repeated .benchmarks.google_message3.Message0 field17091 = 585;
+  repeated .benchmarks.google_message3.Message0 field17098 = 987;
+  repeated .benchmarks.google_message3.Message0 field17101 = 157;
+  repeated string field17102 = 158;
+  repeated string field17107 = 166;
+  repeated string field17133 = 567;
+  repeated string field17134 = 572;
+  repeated string field17160 = 49;
+  repeated string field17168 = 32;
+  repeated string field17170 = 34;
+  repeated .benchmarks.google_message3.Message0 field17172 = 509;
+  repeated string field17174 = 39;
+  repeated .benchmarks.google_message3.Message0 field17175 = 40;
+  repeated .benchmarks.google_message3.Message0 field17178 = 511;
+  repeated .benchmarks.google_message3.Message0 field17185 = 50;
+  repeated int32 field17207 = 1081;
+  repeated .benchmarks.google_message3.Message0 field17238 = 184;
+  repeated .benchmarks.google_message3.Message0 field17289 = 177;
+  repeated .benchmarks.google_message3.Message0 field17290 = 178;
+  repeated .benchmarks.google_message3.Message0 field17296 = 474;
+  repeated string field17298 = 44;
+  repeated .benchmarks.google_message3.Message0 field17301 = 47;
+  optional .benchmarks.google_message3.Message0 field17412 = 21;
+  repeated .benchmarks.google_message3.Message0 field17438 = 132;
+  repeated .benchmarks.google_message3.Message0 field17458 = 512;
+  repeated string field17460 = 560;
+  repeated string field17466 = 552;
+  repeated .benchmarks.google_message3.Message0 field17617 = 1080;
+  repeated int32 field17618 = 1084;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_1.proto b/benchmarks/datasets/google_message3/benchmark_message3_1.proto
new file mode 100644
index 00000000..3219553c
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_1.proto
@@ -0,0 +1,1280 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_2.proto";
+import "datasets/google_message3/benchmark_message3_3.proto";
+import "datasets/google_message3/benchmark_message3_5.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message34390 {
+  repeated .benchmarks.google_message3.Message34387 field34452 = 1;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message34390 field34453 = 92144610;
+  }
+}
+
+message Message34624 {
+  optional .benchmarks.google_message3.Message34621 field34683 = 1;
+  optional .benchmarks.google_message3.Message34621 field34684 = 2;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message34624 field34685 = 18178548;
+  }
+}
+
+message Message34791 {
+  optional fixed64 field34793 = 1;
+  repeated group Message34792 = 2 {
+    required string field34808 = 3;
+    optional string field34809 = 4;
+  }
+  optional int32 field34795 = 5;
+  optional int32 field34796 = 6;
+  optional int32 field34797 = 7;
+  optional int32 field34798 = 8;
+  optional int32 field34799 = 9;
+  optional int32 field34800 = 10;
+  optional bool field34801 = 11;
+  optional float field34802 = 12;
+  optional int32 field34803 = 13;
+  optional string field34804 = 14;
+  optional int64 field34805 = 15;
+  repeated fixed64 field34806 = 17 [packed = true];
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message34791 field34807 = 6330340;
+  }
+}
+
+message Message35483 {
+  optional int32 field35499 = 1;
+  optional string field35500 = 2;
+  optional string field35501 = 3;
+  optional string field35502 = 4;
+  repeated .benchmarks.google_message3.Message35476 field35503 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field35504 = 6;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message35483 field35505 = 7913554;
+  }
+}
+
+message Message35807 {
+  optional int32 field35810 = 1;
+  optional int32 field35811 = 2;
+  optional int32 field35812 = 3;
+  optional int32 field35813 = 4;
+  optional int32 field35814 = 5;
+  optional int32 field35815 = 6;
+  optional int32 field35816 = 7;
+  optional int32 field35817 = 8;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message35807 field35818 = 3803299;
+  }
+}
+
+message Message37487 {
+  optional bytes field37501 = 2;
+  optional bool field37502 = 3;
+}
+
+message Message13062 {
+  optional int64 field13075 = 1;
+  optional string field13076 = 2;
+  optional int32 field13077 = 3;
+  optional string field13078 = 4;
+  optional int32 field13079 = 5;
+}
+
+message Message952 {
+  repeated .benchmarks.google_message3.Message949 field963 = 1;
+}
+
+message Message36876 {
+  optional .benchmarks.google_message3.Message2356 field36980 = 1;
+  repeated group Message36877 = 111 {
+    required string field37044 = 112;
+    optional int32 field37045 = 113;
+    optional bytes field37046 = 114;
+    optional int32 field37047 = 115;
+    optional int32 field37048 = 157;
+  }
+  repeated group Message36878 = 168 {
+  }
+  repeated group Message36879 = 55 {
+    required string field37050 = 56;
+    optional int32 field37051 = 69;
+  }
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field36984 = 78;
+  optional group Message36880 = 137 {
+  }
+  optional uint64 field36986 = 59;
+  optional bytes field36987 = 121;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field36988 = 2;
+  optional .benchmarks.google_message3.Message7029 field36989 = 118;
+  optional .benchmarks.google_message3.Message35573 field36990 = 11;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field36991 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field36992 = 22;
+  optional float field36993 = 13;
+  optional int32 field36994 = 20;
+  optional bool field36995 = 51;
+  optional bool field36996 = 57;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field36997 = 100;
+  optional int32 field36998 = 47;
+  optional int32 field36999 = 48;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37000 = 68;
+  repeated group Message36881 = 23 {
+  }
+  optional .benchmarks.google_message3.Message4144 field37002 = 125;
+  repeated group Message36882 = 35 {
+  }
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37004 = 49;
+  optional .benchmarks.google_message3.Message18921 field37005 = 52;
+  optional .benchmarks.google_message3.Message36858 field37006 = 46;
+  optional .benchmarks.google_message3.Message18831 field37007 = 54;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37008 = 58;
+  optional .benchmarks.google_message3.Message18283 field37009 = 10;
+  optional string field37010 = 44;
+  optional string field37011 = 103;
+  optional .benchmarks.google_message3.Message0 field37012 = 43;
+  optional .benchmarks.google_message3.Message0 field37013 = 143;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37014 = 53;
+  optional .benchmarks.google_message3.Message36869 field37015 = 15;
+  optional group Message36883 = 3 {
+  }
+  repeated group Message36884 = 16 {
+  }
+  repeated group Message36885 = 27 {
+  }
+  optional group Message36886 = 32 {
+  }
+  repeated .benchmarks.google_message3.UnusedEnum field37020 = 71;
+  repeated int32 field37021 = 70;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37022 = 66;
+  optional .benchmarks.google_message3.Message13090 field37023 = 67;
+  optional group Message36887 = 62 {
+  }
+  repeated .benchmarks.google_message3.Message10155 field37025 = 50;
+  repeated .benchmarks.google_message3.Message11874 field37026 = 151;
+  optional string field37027 = 12;
+  optional int64 field37028 = 72;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37029 = 73;
+  optional .benchmarks.google_message3.Message35546 field37030 = 108;
+  optional group Message36888 = 74 {
+    optional uint64 field37089 = 75;
+    optional bool field37090 = 76;
+    optional uint64 field37091 = 165;
+    optional double field37092 = 166;
+    optional uint64 field37093 = 109;
+    optional bytes field37094 = 122;
+  }
+  repeated .benchmarks.google_message3.Message19255 field37032 = 104;
+  optional .benchmarks.google_message3.Message33968 field37033 = 105;
+  optional bool field37034 = 106;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field37035 = 107;
+  optional .benchmarks.google_message3.Message6644 field37036 = 110;
+  optional bytes field37037 = 133;
+  optional group Message36889 = 116 {
+    optional int64 field37095 = 117;
+    optional string field37096 = 145;
+    optional int32 field37097 = 123;
+    optional bool field37098 = 163;
+    optional int32 field37099 = 164;
+    optional int32 field37100 = 149;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field37101 = 129;
+    optional .benchmarks.google_message3.Message13174 field37102 = 124;
+    optional .benchmarks.google_message3.Message13169 field37103 = 128;
+    optional uint64 field37104 = 132;
+    repeated .benchmarks.google_message3.Enum36890 field37105 = 131;
+    optional bool field37106 = 134;
+    optional bool field37107 = 140;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field37108 = 135;
+    optional float field37109 = 136;
+    optional float field37110 = 156;
+    optional bool field37111 = 142;
+    optional int64 field37112 = 167;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field37113 = 146;
+    optional bool field37114 = 148;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field37115 = 154;
+    optional .benchmarks.google_message3.UnusedEnum field37116 = 158;
+    repeated .benchmarks.google_message3.UnusedEnum field37117 = 159;
+    optional int32 field37118 = 160;
+    repeated string field37119 = 161;
+  }
+  repeated group Message36910 = 119 {
+  }
+  optional group Message36911 = 126 {
+    optional .benchmarks.google_message3.UnusedEmptyMessage field37121 = 127;
+    optional .benchmarks.google_message3.Message35538 field37122 = 130;
+    optional .benchmarks.google_message3.Message35540 field37123 = 144;
+    optional .benchmarks.google_message3.Message35542 field37124 = 150;
+  }
+  optional group Message36912 = 152 {
+    optional .benchmarks.google_message3.Message3901 field37125 = 153;
+    optional .benchmarks.google_message3.Message3901 field37126 = 162;
+  }
+  optional .benchmarks.google_message3.UnusedEmptyMessage field37042 = 155;
+}
+
+message Message1328 {
+}
+
+message Message6850 {
+}
+
+message Message6863 {
+  optional .benchmarks.google_message3.Enum6858 field6931 = 1;
+  optional .benchmarks.google_message3.Enum6858 field6932 = 2;
+  optional .benchmarks.google_message3.UnusedEnum field6933 = 36;
+  optional bool field6934 = 27;
+  optional .benchmarks.google_message3.Message6773 field6935 = 26;
+  optional int32 field6936 = 30;
+  optional int32 field6937 = 37;
+  optional .benchmarks.google_message3.Enum6815 field6938 = 31;
+  optional string field6939 = 3;
+  optional int32 field6940 = 4;
+  optional .benchmarks.google_message3.Enum6822 field6941 = 15;
+  optional bool field6942 = 10;
+  optional bool field6943 = 17;
+  optional float field6944 = 18;
+  optional float field6945 = 19;
+  optional int32 field6946 = 5;
+  optional int32 field6947 = 6;
+  optional bool field6948 = 7;
+  optional int32 field6949 = 12;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6950 = 8;
+  optional uint64 field6951 = 9;
+  optional string field6952 = 11;
+  optional bytes field6953 = 13;
+  optional int32 field6954 = 14;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6955 = 16;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6956 = 22;
+  optional .benchmarks.google_message3.Message3886 field6957 = 38;
+  optional string field6958 = 20;
+  optional uint32 field6959 = 21;
+  optional .benchmarks.google_message3.Message6743 field6960 = 23;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6961 = 29;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6962 = 33;
+  optional bool field6963 = 34;
+}
+
+message Message6871 {
+}
+
+message Message7547 {
+  required bytes field7549 = 1;
+  required int32 field7550 = 2;
+}
+
+message Message7648 {
+  optional string field7669 = 1;
+  optional int32 field7670 = 2;
+  optional int32 field7671 = 3;
+  optional int32 field7672 = 4;
+  optional int32 field7673 = 5;
+  optional int32 field7674 = 6;
+  optional float field7675 = 7;
+  optional bool field7676 = 8;
+  optional bool field7677 = 9;
+  optional bool field7678 = 10;
+  optional bool field7679 = 11;
+  optional bool field7680 = 12;
+}
+
+message Message7865 {
+}
+
+message Message7928 {
+  optional string field7940 = 1;
+  optional int64 field7941 = 2;
+}
+
+message Message7919 {
+  optional fixed64 field7931 = 1;
+  optional int64 field7932 = 2;
+  optional bytes field7933 = 3;
+}
+
+message Message7920 {
+  optional int64 field7934 = 1;
+  optional int64 field7935 = 2;
+}
+
+message Message7921 {
+  optional int32 field7936 = 1;
+  optional int64 field7937 = 2;
+  optional float field7938 = 3;
+  optional .benchmarks.google_message3.UnusedEnum field7939 = 4;
+}
+
+message Message8511 {
+  optional .benchmarks.google_message3.Message8224 field8539 = 1;
+  optional string field8540 = 2;
+  optional bool field8541 = 3;
+  optional int64 field8542 = 4;
+  optional string field8543 = 5;
+}
+
+message Message8512 {
+  optional .benchmarks.google_message3.Message8301 field8544 = 1;
+  optional .benchmarks.google_message3.Message8302 field8545 = 2;
+  optional string field8546 = 3;
+  optional bool field8547 = 4;
+  optional int64 field8548 = 5;
+  optional string field8549 = 6;
+}
+
+message Message8513 {
+  repeated .benchmarks.google_message3.Message8392 field8550 = 1;
+  optional string field8551 = 2;
+  optional bool field8552 = 3;
+  optional string field8553 = 4;
+}
+
+message Message8514 {
+  optional string field8554 = 1;
+  optional int64 field8555 = 2;
+  optional bool field8556 = 3;
+  repeated .benchmarks.google_message3.Message8130 field8557 = 4;
+  optional string field8558 = 5;
+}
+
+message Message8515 {
+  optional .benchmarks.google_message3.Message8479 field8559 = 1;
+  optional .benchmarks.google_message3.Message8478 field8560 = 2;
+  optional string field8561 = 3;
+}
+
+message Message10320 {
+  optional .benchmarks.google_message3.Enum10335 field10347 = 1;
+  repeated .benchmarks.google_message3.Message10319 field10348 = 2;
+  optional int32 field10349 = 3;
+  optional int32 field10350 = 4;
+  optional int32 field10351 = 5;
+  optional int32 field10352 = 6;
+  optional .benchmarks.google_message3.Enum10337 field10353 = 7;
+}
+
+message Message10321 {
+  optional int32 field10354 = 1;
+  optional int32 field10355 = 2;
+  optional uint64 field10356 = 3;
+}
+
+message Message10322 {
+  optional .benchmarks.google_message3.Message4016 field10357 = 1;
+  optional bool field10358 = 2;
+  optional bool field10359 = 3;
+}
+
+message Message11988 {
+  optional string field12021 = 1;
+  optional string field12022 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field12023 = 3;
+  optional .benchmarks.google_message3.Message10155 field12024 = 4;
+}
+
+message Message12668 {
+  repeated .benchmarks.google_message3.Message12669 field12677 = 1;
+  optional int32 field12678 = 2;
+  optional int32 field12679 = 3;
+  optional int32 field12680 = 4;
+}
+
+message Message12825 {
+  repeated .benchmarks.google_message3.Message12818 field12862 = 1;
+  optional int32 field12863 = 2;
+  optional .benchmarks.google_message3.Message12819 field12864 = 3;
+  optional .benchmarks.google_message3.Message12820 field12865 = 4;
+  optional int32 field12866 = 5;
+  repeated .benchmarks.google_message3.Message12821 field12867 = 6;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field12868 = 7;
+}
+
+message Message16478 {
+  repeated .benchmarks.google_message3.Message16479 field16481 = 1;
+  optional bool field16482 = 3;
+  optional int32 field16483 = 2;
+}
+
+message Message16552 {
+  optional fixed64 field16565 = 1;
+  optional int32 field16566 = 2;
+  optional .benchmarks.google_message3.Enum16553 field16567 = 3;
+}
+
+message Message16660 {
+  optional string field16668 = 1;
+  optional string field16669 = 2;
+  optional int32 field16670 = 3;
+}
+
+message Message16727 {
+  required .benchmarks.google_message3.Enum16728 field16782 = 1;
+  required string field16783 = 2;
+  optional string field16784 = 3;
+  optional int32 field16785 = 23;
+  required string field16786 = 4;
+  optional string field16787 = 5;
+  optional string field16788 = 6;
+  required .benchmarks.google_message3.Enum16732 field16789 = 7;
+  optional string field16790 = 8;
+  optional string field16791 = 9;
+  optional string field16792 = 10;
+  optional .benchmarks.google_message3.Enum16738 field16793 = 11;
+  optional int32 field16794 = 12;
+  repeated .benchmarks.google_message3.Message16722 field16795 = 13;
+  optional bool field16796 = 19;
+  optional bool field16797 = 24;
+  optional string field16798 = 14;
+  optional int64 field16799 = 15;
+  optional bool field16800 = 16;
+  optional string field16801 = 17;
+  optional .benchmarks.google_message3.Enum16698 field16802 = 18;
+  optional .benchmarks.google_message3.Message16724 field16803 = 20;
+  optional bool field16804 = 22;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field16805 = 25;
+  extensions 1000 to 536870911;
+}
+
+message Message16725 {
+  optional .benchmarks.google_message3.Enum16728 field16774 = 1;
+  repeated string field16775 = 2;
+}
+
+message Message17726 {
+  optional string field17801 = 1;
+  repeated string field17802 = 2;
+  optional string field17803 = 3;
+  repeated string field17804 = 4;
+  optional string field17805 = 5;
+  repeated string field17806 = 6;
+  optional string field17807 = 7;
+  optional string field17808 = 8;
+  repeated string field17809 = 15;
+  repeated string field17810 = 16;
+  repeated string field17811 = 17;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17812 = 18;
+  optional string field17813 = 9;
+  optional string field17814 = 10;
+  optional string field17815 = 11;
+  optional string field17816 = 12;
+  optional string field17817 = 13;
+  optional string field17818 = 14;
+  optional string field17819 = 19;
+  repeated .benchmarks.google_message3.Message17728 field17820 = 20;
+  repeated .benchmarks.google_message3.Message17728 field17821 = 21;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17822 = 30;
+}
+
+message Message17782 {
+  optional string field18153 = 1;
+  optional string field18154 = 2;
+}
+
+message Message17783 {
+  optional string field18155 = 1;
+  optional string field18156 = 2;
+  optional string field18157 = 3;
+  repeated group Message17784 = 4 {
+    optional string field18162 = 5;
+    optional string field18163 = 6;
+    optional string field18164 = 7;
+    repeated string field18165 = 8;
+    optional string field18166 = 17;
+    optional string field18167 = 18;
+  }
+  repeated group Message17785 = 9 {
+    optional string field18168 = 10;
+    optional string field18169 = 11;
+    optional .benchmarks.google_message3.Message17783 field18170 = 12;
+    optional string field18171 = 13;
+    optional string field18172 = 14;
+    repeated string field18173 = 15;
+  }
+  repeated string field18160 = 16;
+}
+
+message Message16945 {
+  optional string field16946 = 1;
+  optional string field16947 = 2;
+  optional string field16948 = 3;
+  optional string field16949 = 4;
+  optional string field16950 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field16951 = 872;
+  repeated .benchmarks.google_message3.Message0 field16952 = 16;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16953 = 54;
+  repeated .benchmarks.google_message3.Message0 field16954 = 55;
+  repeated string field16955 = 58;
+  repeated string field16956 = 59;
+  repeated string field16957 = 62;
+  repeated string field16958 = 37;
+  repeated string field16959 = 18;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16960 = 38;
+  repeated .benchmarks.google_message3.Message0 field16961 = 67;
+  repeated .benchmarks.google_message3.Message0 field16962 = 130;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16963 = 136;
+  repeated string field16964 = 138;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16965 = 156;
+  repeated string field16966 = 139;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16967 = 126;
+  repeated string field16968 = 152;
+  repeated .benchmarks.google_message3.Message0 field16969 = 183;
+  repeated string field16970 = 168;
+  repeated string field16971 = 212;
+  repeated string field16972 = 213;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16973 = 189;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16974 = 190;
+  repeated string field16975 = 191;
+  repeated string field16976 = 192;
+  repeated .benchmarks.google_message3.Message0 field16977 = 193;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16978 = 194;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16979 = 195;
+  repeated int32 field16980 = 196;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16981 = 95;
+  repeated string field16982 = 96;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16983 = 97;
+  repeated string field16984 = 1086;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16985 = 98;
+  repeated string field16986 = 99;
+  repeated string field16987 = 100;
+  repeated string field16988 = 48;
+  optional string field16989 = 22;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field16990 = 51;
+  repeated string field16991 = 81;
+  repeated string field16992 = 85;
+  repeated string field16993 = 169;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field16994 = 260;
+  optional int32 field16995 = 198;
+  optional int32 field16996 = 204;
+  optional string field16997 = 1087;
+  repeated string field16998 = 197;
+  repeated string field16999 = 206;
+  optional string field17000 = 211;
+  repeated string field17001 = 205;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17002 = 68;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17003 = 69;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17004 = 70;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17005 = 71;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17006 = 72;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17007 = 19;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17008 = 24;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field17009 = 23;
+  repeated .benchmarks.google_message3.Message0 field17010 = 131;
+  repeated string field17011 = 133;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17012 = 142;
+  repeated string field17013 = 143;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field17014 = 153;
+  repeated .benchmarks.google_message3.Message0 field17015 = 170;
+  repeated string field17016 = 171;
+  repeated string field17017 = 172;
+  repeated string field17018 = 173;
+  repeated string field17019 = 174;
+  repeated string field17020 = 175;
+  repeated string field17021 = 186;
+  repeated string field17022 = 101;
+  repeated .benchmarks.google_message3.Message0 field17023 = 102;
+  repeated string field17024 = 274;
+  extensions 17 to 17;
+  extensions 21 to 21;
+  extensions 25 to 25;
+  extensions 27 to 27;
+  extensions 29 to 29;
+  extensions 30 to 30;
+  extensions 31 to 31;
+  extensions 32 to 32;
+  extensions 33 to 33;
+  extensions 34 to 34;
+  extensions 35 to 35;
+  extensions 36 to 36;
+  extensions 39 to 39;
+  extensions 40 to 40;
+  extensions 41 to 41;
+  extensions 42 to 42;
+  extensions 43 to 43;
+  extensions 44 to 44;
+  extensions 45 to 45;
+  extensions 46 to 46;
+  extensions 47 to 47;
+  extensions 49 to 49;
+  extensions 50 to 50;
+  extensions 52 to 52;
+  extensions 53 to 53;
+  extensions 56 to 56;
+  extensions 57 to 57;
+  extensions 60 to 60;
+  extensions 61 to 61;
+  extensions 63 to 63;
+  extensions 64 to 64;
+  extensions 65 to 65;
+  extensions 66 to 66;
+  extensions 73 to 73;
+  extensions 74 to 74;
+  extensions 75 to 75;
+  extensions 76 to 76;
+  extensions 77 to 77;
+  extensions 78 to 78;
+  extensions 79 to 79;
+  extensions 80 to 80;
+  extensions 82 to 82;
+  extensions 83 to 83;
+  extensions 84 to 84;
+  extensions 86 to 86;
+  extensions 87 to 87;
+  extensions 88 to 88;
+  extensions 89 to 89;
+  extensions 90 to 90;
+  extensions 91 to 91;
+  extensions 92 to 92;
+  extensions 93 to 93;
+  extensions 94 to 94;
+  extensions 103 to 103;
+  extensions 104 to 104;
+  extensions 105 to 105;
+  extensions 106 to 106;
+  extensions 107 to 107;
+  extensions 108 to 108;
+  extensions 109 to 109;
+  extensions 110 to 110;
+  extensions 111 to 111;
+  extensions 112 to 112;
+  extensions 113 to 113;
+  extensions 114 to 114;
+  extensions 115 to 115;
+  extensions 116 to 116;
+  extensions 117 to 117;
+  extensions 118 to 118;
+  extensions 119 to 119;
+  extensions 120 to 120;
+  extensions 121 to 121;
+  extensions 122 to 122;
+  extensions 123 to 123;
+  extensions 124 to 124;
+  extensions 125 to 125;
+  extensions 127 to 127;
+  extensions 128 to 128;
+  extensions 129 to 129;
+  extensions 132 to 132;
+  extensions 134 to 134;
+  extensions 135 to 135;
+  extensions 137 to 137;
+  extensions 140 to 140;
+  extensions 141 to 141;
+  extensions 144 to 144;
+  extensions 145 to 145;
+  extensions 146 to 146;
+  extensions 147 to 147;
+  extensions 148 to 148;
+  extensions 149 to 149;
+  extensions 150 to 150;
+  extensions 151 to 151;
+  extensions 154 to 154;
+  extensions 155 to 155;
+  extensions 157 to 157;
+  extensions 158 to 158;
+  extensions 159 to 159;
+  extensions 160 to 160;
+  extensions 161 to 161;
+  extensions 162 to 162;
+  extensions 163 to 163;
+  extensions 164 to 164;
+  extensions 165 to 165;
+  extensions 166 to 166;
+  extensions 167 to 167;
+  extensions 176 to 176;
+  extensions 177 to 177;
+  extensions 178 to 178;
+  extensions 179 to 179;
+  extensions 180 to 180;
+  extensions 181 to 181;
+  extensions 182 to 182;
+  extensions 184 to 184;
+  extensions 185 to 185;
+  extensions 187 to 187;
+  extensions 188 to 188;
+  extensions 199 to 199;
+  extensions 200 to 200;
+  extensions 201 to 201;
+  extensions 202 to 202;
+  extensions 203 to 203;
+  extensions 207 to 207;
+  extensions 208 to 208;
+  extensions 209 to 209;
+  extensions 210 to 210;
+  extensions 214 to 214;
+  extensions 215 to 215;
+  extensions 216 to 216;
+  extensions 217 to 217;
+  extensions 218 to 218;
+  extensions 219 to 219;
+  extensions 220 to 220;
+  extensions 221 to 221;
+  extensions 222 to 222;
+  extensions 223 to 223;
+  extensions 224 to 224;
+  extensions 225 to 225;
+  extensions 226 to 226;
+  extensions 227 to 227;
+  extensions 228 to 228;
+  extensions 229 to 229;
+  extensions 230 to 230;
+  extensions 231 to 231;
+  extensions 232 to 232;
+  extensions 233 to 233;
+  extensions 234 to 234;
+  extensions 235 to 235;
+  extensions 236 to 236;
+  extensions 237 to 237;
+  extensions 238 to 238;
+  extensions 239 to 239;
+  extensions 240 to 240;
+  extensions 241 to 241;
+  extensions 242 to 242;
+  extensions 243 to 243;
+  extensions 244 to 244;
+  extensions 245 to 245;
+  extensions 246 to 246;
+  extensions 247 to 247;
+  extensions 248 to 248;
+  extensions 249 to 249;
+  extensions 250 to 250;
+  extensions 251 to 251;
+  extensions 252 to 252;
+  extensions 253 to 253;
+  extensions 254 to 254;
+  extensions 255 to 255;
+  extensions 256 to 256;
+  extensions 257 to 257;
+  extensions 258 to 258;
+  extensions 259 to 259;
+  extensions 261 to 261;
+  extensions 262 to 262;
+  extensions 263 to 263;
+  extensions 264 to 264;
+  extensions 265 to 265;
+  extensions 266 to 266;
+  extensions 267 to 267;
+  extensions 268 to 268;
+  extensions 269 to 269;
+  extensions 270 to 270;
+  extensions 271 to 271;
+  extensions 272 to 272;
+  extensions 273 to 273;
+  extensions 275 to 275;
+  extensions 276 to 276;
+  extensions 277 to 277;
+  extensions 278 to 278;
+  extensions 279 to 279;
+  extensions 280 to 280;
+  extensions 281 to 281;
+  extensions 282 to 282;
+  extensions 283 to 283;
+  extensions 284 to 284;
+  extensions 285 to 285;
+  extensions 286 to 286;
+  extensions 290 to 290;
+  extensions 291 to 291;
+  extensions 292 to 292;
+  extensions 293 to 293;
+  extensions 294 to 294;
+  extensions 295 to 295;
+  extensions 296 to 296;
+  extensions 297 to 297;
+  extensions 298 to 298;
+  extensions 299 to 299;
+  extensions 300 to 300;
+  extensions 301 to 301;
+  extensions 302 to 302;
+  extensions 303 to 303;
+  extensions 304 to 304;
+  extensions 305 to 305;
+  extensions 306 to 306;
+  extensions 307 to 307;
+  extensions 308 to 308;
+  extensions 309 to 309;
+  extensions 310 to 310;
+  extensions 311 to 311;
+  extensions 312 to 312;
+  extensions 313 to 313;
+  extensions 314 to 314;
+  extensions 315 to 315;
+  extensions 316 to 316;
+  extensions 317 to 317;
+  extensions 318 to 318;
+  extensions 319 to 319;
+  extensions 320 to 320;
+  extensions 321 to 321;
+  extensions 322 to 322;
+  extensions 323 to 323;
+  extensions 324 to 324;
+  extensions 325 to 325;
+  extensions 326 to 326;
+  extensions 327 to 327;
+  extensions 328 to 328;
+  extensions 329 to 329;
+  extensions 330 to 330;
+  extensions 331 to 331;
+  extensions 332 to 332;
+  extensions 333 to 333;
+  extensions 334 to 334;
+  extensions 335 to 335;
+  extensions 336 to 336;
+  extensions 337 to 337;
+  extensions 338 to 338;
+  extensions 339 to 339;
+  extensions 340 to 340;
+  extensions 341 to 341;
+  extensions 342 to 342;
+  extensions 343 to 343;
+  extensions 344 to 344;
+  extensions 345 to 345;
+  extensions 346 to 346;
+  extensions 347 to 347;
+  extensions 348 to 348;
+  extensions 349 to 349;
+  extensions 350 to 350;
+  extensions 351 to 351;
+  extensions 352 to 352;
+  extensions 353 to 353;
+  extensions 354 to 354;
+  extensions 355 to 355;
+  extensions 356 to 356;
+  extensions 357 to 357;
+  extensions 358 to 358;
+  extensions 359 to 359;
+  extensions 360 to 360;
+  extensions 361 to 361;
+  extensions 362 to 362;
+  extensions 363 to 363;
+  extensions 364 to 364;
+  extensions 365 to 365;
+  extensions 366 to 366;
+  extensions 367 to 367;
+  extensions 368 to 368;
+  extensions 369 to 369;
+  extensions 370 to 370;
+  extensions 371 to 371;
+  extensions 372 to 372;
+  extensions 373 to 373;
+  extensions 374 to 374;
+  extensions 375 to 375;
+  extensions 376 to 376;
+  extensions 377 to 377;
+  extensions 378 to 378;
+  extensions 379 to 379;
+  extensions 380 to 380;
+  extensions 381 to 381;
+  extensions 382 to 382;
+  extensions 383 to 383;
+  extensions 384 to 384;
+  extensions 385 to 385;
+  extensions 386 to 386;
+  extensions 387 to 387;
+  extensions 388 to 388;
+  extensions 389 to 389;
+  extensions 390 to 390;
+  extensions 391 to 391;
+  extensions 392 to 392;
+  extensions 393 to 393;
+  extensions 394 to 394;
+  extensions 395 to 395;
+  extensions 396 to 396;
+  extensions 397 to 397;
+  extensions 398 to 398;
+  extensions 399 to 399;
+  extensions 400 to 400;
+  extensions 401 to 401;
+  extensions 402 to 402;
+  extensions 403 to 403;
+  extensions 404 to 404;
+  extensions 405 to 405;
+  extensions 406 to 406;
+  extensions 407 to 407;
+  extensions 408 to 408;
+  extensions 409 to 409;
+  extensions 410 to 410;
+  extensions 411 to 411;
+  extensions 412 to 412;
+  extensions 413 to 413;
+  extensions 414 to 414;
+  extensions 415 to 415;
+  extensions 416 to 416;
+  extensions 417 to 417;
+  extensions 418 to 418;
+  extensions 419 to 419;
+  extensions 420 to 420;
+  extensions 421 to 421;
+  extensions 422 to 422;
+  extensions 423 to 423;
+  extensions 424 to 424;
+  extensions 425 to 425;
+  extensions 426 to 426;
+  extensions 427 to 427;
+  extensions 428 to 428;
+  extensions 429 to 429;
+  extensions 430 to 430;
+  extensions 431 to 431;
+  extensions 432 to 432;
+  extensions 433 to 433;
+  extensions 434 to 434;
+  extensions 435 to 435;
+  extensions 436 to 436;
+  extensions 437 to 437;
+  extensions 438 to 438;
+  extensions 439 to 439;
+  extensions 440 to 440;
+  extensions 441 to 441;
+  extensions 442 to 442;
+  extensions 443 to 443;
+  extensions 444 to 444;
+  extensions 445 to 445;
+  extensions 446 to 446;
+  extensions 447 to 447;
+  extensions 448 to 448;
+  extensions 449 to 449;
+  extensions 450 to 450;
+  extensions 451 to 451;
+  extensions 452 to 452;
+  extensions 453 to 453;
+  extensions 454 to 454;
+  extensions 455 to 455;
+  extensions 456 to 456;
+  extensions 457 to 457;
+  extensions 458 to 458;
+  extensions 459 to 459;
+  extensions 460 to 460;
+  extensions 461 to 461;
+  extensions 462 to 462;
+  extensions 463 to 463;
+  extensions 464 to 464;
+  extensions 465 to 465;
+  extensions 466 to 466;
+  extensions 467 to 467;
+  extensions 468 to 468;
+  extensions 469 to 469;
+  extensions 470 to 470;
+  extensions 471 to 471;
+  extensions 472 to 472;
+  extensions 473 to 473;
+  extensions 474 to 474;
+  extensions 509 to 509;
+  extensions 511 to 511;
+  extensions 512 to 512;
+  extensions 513 to 513;
+  extensions 514 to 514;
+  extensions 515 to 515;
+  extensions 516 to 516;
+  extensions 517 to 517;
+  extensions 518 to 518;
+  extensions 519 to 519;
+  extensions 520 to 520;
+  extensions 521 to 521;
+  extensions 522 to 522;
+  extensions 523 to 523;
+  extensions 524 to 524;
+  extensions 525 to 525;
+  extensions 526 to 526;
+  extensions 527 to 527;
+  extensions 528 to 528;
+  extensions 529 to 529;
+  extensions 530 to 530;
+  extensions 531 to 531;
+  extensions 532 to 532;
+  extensions 533 to 533;
+  extensions 534 to 534;
+  extensions 535 to 535;
+  extensions 536 to 536;
+  extensions 537 to 537;
+  extensions 538 to 538;
+  extensions 539 to 539;
+  extensions 540 to 540;
+  extensions 541 to 541;
+  extensions 542 to 542;
+  extensions 543 to 543;
+  extensions 544 to 544;
+  extensions 545 to 545;
+  extensions 546 to 546;
+  extensions 547 to 547;
+  extensions 548 to 548;
+  extensions 549 to 549;
+  extensions 550 to 550;
+  extensions 551 to 551;
+  extensions 552 to 552;
+  extensions 553 to 553;
+  extensions 554 to 554;
+  extensions 555 to 555;
+  extensions 556 to 556;
+  extensions 557 to 557;
+  extensions 558 to 558;
+  extensions 559 to 559;
+  extensions 560 to 560;
+  extensions 561 to 561;
+  extensions 562 to 562;
+  extensions 563 to 563;
+  extensions 564 to 564;
+  extensions 565 to 565;
+  extensions 566 to 566;
+  extensions 567 to 567;
+  extensions 568 to 568;
+  extensions 569 to 569;
+  extensions 570 to 570;
+  extensions 571 to 571;
+  extensions 572 to 572;
+  extensions 573 to 573;
+  extensions 574 to 574;
+  extensions 575 to 575;
+  extensions 576 to 576;
+  extensions 577 to 577;
+  extensions 578 to 578;
+  extensions 579 to 579;
+  extensions 580 to 580;
+  extensions 581 to 581;
+  extensions 582 to 582;
+  extensions 583 to 583;
+  extensions 584 to 584;
+  extensions 585 to 585;
+  extensions 586 to 586;
+  extensions 587 to 587;
+  extensions 588 to 588;
+  extensions 589 to 589;
+  extensions 590 to 590;
+  extensions 604 to 604;
+  extensions 605 to 605;
+  extensions 606 to 606;
+  extensions 607 to 607;
+  extensions 608 to 608;
+  extensions 609 to 609;
+  extensions 610 to 610;
+  extensions 611 to 611;
+  extensions 612 to 612;
+  extensions 613 to 613;
+  extensions 614 to 614;
+  extensions 615 to 615;
+  extensions 616 to 616;
+  extensions 617 to 617;
+  extensions 618 to 618;
+  extensions 619 to 619;
+  extensions 620 to 620;
+  extensions 621 to 621;
+  extensions 622 to 622;
+  extensions 623 to 623;
+  extensions 624 to 624;
+  extensions 625 to 625;
+  extensions 626 to 626;
+  extensions 627 to 627;
+  extensions 628 to 628;
+  extensions 629 to 629;
+  extensions 813 to 813;
+  extensions 814 to 814;
+  extensions 815 to 815;
+  extensions 816 to 816;
+  extensions 817 to 817;
+  extensions 818 to 818;
+  extensions 819 to 819;
+  extensions 820 to 820;
+  extensions 821 to 821;
+  extensions 822 to 822;
+  extensions 823 to 823;
+  extensions 824 to 824;
+  extensions 827 to 827;
+  extensions 828 to 828;
+  extensions 829 to 829;
+  extensions 830 to 830;
+  extensions 831 to 831;
+  extensions 832 to 832;
+  extensions 833 to 833;
+  extensions 834 to 834;
+  extensions 835 to 835;
+  extensions 836 to 836;
+  extensions 837 to 837;
+  extensions 838 to 838;
+  extensions 839 to 839;
+  extensions 840 to 840;
+  extensions 841 to 841;
+  extensions 842 to 842;
+  extensions 843 to 843;
+  extensions 844 to 844;
+  extensions 845 to 845;
+  extensions 846 to 846;
+  extensions 847 to 847;
+  extensions 848 to 848;
+  extensions 849 to 849;
+  extensions 850 to 850;
+  extensions 851 to 851;
+  extensions 852 to 852;
+  extensions 853 to 853;
+  extensions 854 to 854;
+  extensions 855 to 855;
+  extensions 856 to 856;
+  extensions 857 to 857;
+  extensions 858 to 858;
+  extensions 859 to 859;
+  extensions 860 to 860;
+  extensions 861 to 861;
+  extensions 862 to 862;
+  extensions 863 to 863;
+  extensions 864 to 864;
+  extensions 865 to 865;
+  extensions 866 to 866;
+  extensions 867 to 867;
+  extensions 868 to 868;
+  extensions 869 to 869;
+  extensions 870 to 870;
+  extensions 871 to 871;
+  extensions 880 to 880;
+  extensions 881 to 881;
+  extensions 882 to 882;
+  extensions 883 to 883;
+  extensions 884 to 884;
+  extensions 885 to 885;
+  extensions 886 to 886;
+  extensions 887 to 887;
+  extensions 888 to 888;
+  extensions 890 to 890;
+  extensions 891 to 891;
+  extensions 892 to 892;
+  extensions 912 to 912;
+  extensions 914 to 914;
+  extensions 915 to 915;
+  extensions 916 to 916;
+  extensions 917 to 917;
+  extensions 918 to 918;
+  extensions 919 to 919;
+  extensions 920 to 920;
+  extensions 921 to 921;
+  extensions 922 to 922;
+  extensions 923 to 923;
+  extensions 924 to 924;
+  extensions 925 to 925;
+  extensions 926 to 926;
+  extensions 927 to 927;
+  extensions 928 to 928;
+  extensions 929 to 929;
+  extensions 930 to 930;
+  extensions 931 to 931;
+  extensions 932 to 932;
+  extensions 933 to 933;
+  extensions 934 to 934;
+  extensions 935 to 935;
+  extensions 936 to 936;
+  extensions 937 to 937;
+  extensions 938 to 938;
+  extensions 939 to 939;
+  extensions 940 to 940;
+  extensions 941 to 941;
+  extensions 942 to 942;
+  extensions 943 to 943;
+  extensions 944 to 944;
+  extensions 945 to 945;
+  extensions 946 to 946;
+  extensions 947 to 947;
+  extensions 949 to 949;
+  extensions 950 to 950;
+  extensions 951 to 951;
+  extensions 952 to 952;
+  extensions 954 to 954;
+  extensions 955 to 955;
+  extensions 956 to 956;
+  extensions 957 to 957;
+  extensions 958 to 958;
+  extensions 959 to 959;
+  extensions 960 to 960;
+  extensions 961 to 961;
+  extensions 962 to 962;
+  extensions 963 to 963;
+  extensions 964 to 964;
+  extensions 965 to 965;
+  extensions 966 to 966;
+  extensions 967 to 967;
+  extensions 968 to 968;
+  extensions 969 to 969;
+  extensions 970 to 970;
+  extensions 971 to 971;
+  extensions 972 to 972;
+  extensions 973 to 973;
+  extensions 974 to 974;
+  extensions 975 to 975;
+  extensions 976 to 976;
+  extensions 977 to 977;
+  extensions 978 to 978;
+  extensions 979 to 979;
+  extensions 980 to 980;
+  extensions 981 to 981;
+  extensions 982 to 982;
+  extensions 983 to 983;
+  extensions 984 to 984;
+  extensions 985 to 985;
+  extensions 987 to 987;
+  extensions 988 to 988;
+  extensions 1000 to 1000;
+  extensions 1001 to 1001;
+  extensions 1002 to 1002;
+  extensions 1003 to 1003;
+  extensions 1004 to 1004;
+  extensions 1005 to 1005;
+  extensions 1006 to 1006;
+  extensions 1007 to 1007;
+  extensions 1008 to 1008;
+  extensions 1009 to 1009;
+  extensions 1010 to 1010;
+  extensions 1011 to 1011;
+  extensions 1012 to 1012;
+  extensions 1013 to 1013;
+  extensions 1014 to 1014;
+  extensions 1015 to 1015;
+  extensions 1016 to 1016;
+  extensions 1017 to 1017;
+  extensions 1018 to 1018;
+  extensions 1019 to 1019;
+  extensions 1020 to 1020;
+  extensions 1021 to 1021;
+  extensions 1022 to 1022;
+  extensions 1023 to 1023;
+  extensions 1024 to 1024;
+  extensions 1025 to 1025;
+  extensions 1026 to 1026;
+  extensions 1027 to 1027;
+  extensions 1028 to 1028;
+  extensions 1029 to 1029;
+  extensions 1030 to 1030;
+  extensions 1031 to 1031;
+  extensions 1032 to 1032;
+  extensions 1033 to 1033;
+  extensions 1034 to 1034;
+  extensions 1035 to 1035;
+  extensions 1036 to 1036;
+  extensions 1037 to 1037;
+  extensions 1038 to 1038;
+  extensions 1039 to 1039;
+  extensions 1040 to 1040;
+  extensions 1041 to 1041;
+  extensions 1042 to 1042;
+  extensions 1043 to 1043;
+  extensions 1044 to 1044;
+  extensions 1045 to 1045;
+  extensions 1046 to 1046;
+  extensions 1047 to 1047;
+  extensions 1048 to 1048;
+  extensions 1049 to 1049;
+  extensions 1050 to 1050;
+  extensions 1051 to 1051;
+  extensions 1052 to 1052;
+  extensions 1053 to 1053;
+  extensions 1054 to 1054;
+  extensions 1055 to 1055;
+  extensions 1056 to 1056;
+  extensions 1057 to 1057;
+  extensions 1058 to 1058;
+  extensions 1079 to 1079;
+  extensions 1080 to 1080;
+  extensions 1081 to 1081;
+  extensions 1082 to 1082;
+  extensions 1083 to 1083;
+  extensions 1084 to 1084;
+  extensions 1085 to 1085;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message16945 field17025 = 22068132;
+  }
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_2.proto b/benchmarks/datasets/google_message3/benchmark_message3_2.proto
new file mode 100644
index 00000000..7ab993ba
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_2.proto
@@ -0,0 +1,499 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_3.proto";
+import "datasets/google_message3/benchmark_message3_4.proto";
+import "datasets/google_message3/benchmark_message3_5.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message22853 {
+  optional .benchmarks.google_message3.Enum22854 field22869 = 1;
+  repeated uint32 field22870 = 2 [packed = true];
+  repeated float field22871 = 3 [packed = true];
+  repeated float field22872 = 5 [packed = true];
+  optional .benchmarks.google_message3.UnusedEmptyMessage field22873 = 4;
+}
+
+message Message24345 {
+  optional string field24533 = 1;
+  optional .benchmarks.google_message3.UnusedEnum field24534 = 22;
+  optional .benchmarks.google_message3.Message24346 field24535 = 2;
+  optional string field24536 = 3;
+  optional string field24537 = 4;
+  optional .benchmarks.google_message3.UnusedEnum field24538 = 23;
+  optional string field24539 = 5;
+  required string field24540 = 6;
+  optional string field24541 = 7;
+  optional string field24542 = 8;
+  optional .benchmarks.google_message3.Message24316 field24543 = 9;
+  optional .benchmarks.google_message3.Message24376 field24544 = 10;
+  optional string field24545 = 11;
+  optional string field24546 = 19;
+  optional string field24547 = 20;
+  optional string field24548 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24549 = 12;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24550 = 13;
+  repeated string field24551 = 14;
+  optional string field24552 = 15;
+  optional int32 field24553 = 18;
+  optional .benchmarks.google_message3.Message24379 field24554 = 16;
+  optional string field24555 = 17;
+  repeated .benchmarks.google_message3.Message24356 field24556 = 24;
+  repeated .benchmarks.google_message3.Message24366 field24557 = 25;
+}
+
+message Message24403 {
+  optional .benchmarks.google_message3.Message24401 field24681 = 1;
+  optional .benchmarks.google_message3.Message24402 field24682 = 2;
+}
+
+message Message24391 {
+  optional string field24631 = 1;
+  optional string field24632 = 2;
+  repeated string field24633 = 3;
+  optional string field24634 = 4;
+  repeated string field24635 = 5;
+  repeated string field24636 = 16;
+  optional string field24637 = 17;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24638 = 25;
+  optional string field24639 = 7;
+  optional string field24640 = 18;
+  optional string field24641 = 19;
+  optional string field24642 = 20;
+  optional int32 field24643 = 24;
+  optional .benchmarks.google_message3.Message24379 field24644 = 8;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24645 = 9;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24646 = 10;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24647 = 11;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24648 = 12;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24649 = 13;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24650 = 14;
+  optional string field24651 = 21;
+  optional int32 field24652 = 22;
+  optional int32 field24653 = 23;
+  repeated string field24654 = 15;
+  repeated string field24655 = 6;
+}
+
+message Message27454 {
+}
+
+message Message27357 {
+  optional string field27410 = 1;
+  optional float field27411 = 2;
+  optional string field27412 = 3;
+  optional bool field27413 = 4;
+  optional bool field27414 = 5;
+}
+
+message Message27360 {
+  optional .benchmarks.google_message3.Message27358 field27426 = 1;
+  optional .benchmarks.google_message3.Enum27361 field27427 = 2;
+  optional .benchmarks.google_message3.Message27358 field27428 = 3;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field27429 = 4;
+}
+
+message Message34387 {
+  optional string field34446 = 1;
+  repeated .benchmarks.google_message3.Message34381 field34447 = 2;
+  optional .benchmarks.google_message3.UnusedEnum field34448 = 3;
+  optional .benchmarks.google_message3.Enum34388 field34449 = 4;
+  optional int64 field34450 = 5;
+}
+
+message Message34621 {
+  optional double field34651 = 1;
+  optional double field34652 = 2;
+  optional double field34653 = 3;
+  optional double field34654 = 4;
+  optional double field34655 = 11;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34656 = 13;
+  optional .benchmarks.google_message3.Message34619 field34657 = 14;
+  optional string field34658 = 5;
+  optional string field34659 = 9;
+  optional double field34660 = 12;
+  optional bytes field34661 = 19;
+  optional string field34662 = 15;
+  optional string field34663 = 16;
+  optional string field34664 = 17;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34665 = 18;
+  optional .benchmarks.google_message3.Message34621 field34666 = 20;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field34667 = 100;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34668 = 101;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message34621 field34669 = 17562023;
+  }
+}
+
+message Message35476 {
+  optional string field35484 = 1;
+  optional string field35485 = 2;
+  optional string field35486 = 3;
+  optional .benchmarks.google_message3.Enum35477 field35487 = 4;
+  optional float field35488 = 5;
+  optional float field35489 = 6;
+  optional float field35490 = 7;
+  optional float field35491 = 8;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field35492 = 9;
+  optional int32 field35493 = 10;
+  optional int32 field35494 = 11;
+  optional int32 field35495 = 12;
+  optional string field35496 = 13;
+  optional string field35497 = 14;
+}
+
+message Message949 {
+  optional string field955 = 1;
+  optional int64 field956 = 2;
+  optional int64 field957 = 3;
+  optional .benchmarks.google_message3.Message730 field958 = 4;
+  repeated string field959 = 5;
+  optional string field960 = 6;
+  optional bool field961 = 7;
+}
+
+message Message36869 {
+  optional int32 field36970 = 1;
+  optional int32 field36971 = 2;
+}
+
+message Message33968 {
+  repeated group Message33969 = 1 {
+  }
+  repeated .benchmarks.google_message3.Message33958 field33989 = 3;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field33990 = 106;
+  optional bool field33991 = 108;
+  optional .benchmarks.google_message3.UnusedEnum field33992 = 107;
+}
+
+message Message6644 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6701 = 8;
+  optional string field6702 = 1;
+  optional double field6703 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6704 = 9;
+  optional bytes field6705 = 3;
+  optional bytes field6706 = 19;
+  optional .benchmarks.google_message3.Message6637 field6707 = 4;
+  repeated .benchmarks.google_message3.Message6126 field6708 = 18;
+  optional bool field6709 = 6;
+  optional .benchmarks.google_message3.Message6643 field6710 = 10;
+  optional string field6711 = 12;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6712 = 14;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6713 = 15;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6714 = 16;
+  optional int32 field6715 = 17;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6716 = 20;
+}
+
+message Message18831 {
+  repeated group Message18832 = 1 {
+    optional int32 field18836 = 2;
+    optional string field18837 = 5;
+    optional float field18838 = 3;
+    optional float field18839 = 9;
+    optional int32 field18840 = 11;
+    repeated uint64 field18841 = 4;
+    repeated group Message18833 = 6 {
+      required uint64 field18843 = 7;
+      optional string field18844 = 8;
+      optional float field18845 = 10;
+      optional int32 field18846 = 12;
+      optional bool field18847 = 13;
+    }
+  }
+}
+
+message Message13090 {
+  optional .benchmarks.google_message3.Message13083 field13141 = 1;
+  optional .benchmarks.google_message3.Message13088 field13142 = 2;
+}
+
+message Message11874 {
+  optional .benchmarks.google_message3.Message10391 field11888 = 3;
+  optional string field11889 = 4;
+  optional .benchmarks.google_message3.Message11873 field11890 = 6;
+  optional bool field11891 = 7;
+  extensions 1 to 1;
+  extensions 2 to 2;
+  extensions 5 to 5;
+}
+
+message Message4144 {
+  repeated group Message4145 = 1 {
+    required .benchmarks.google_message3.Enum4146 field4165 = 2;
+    required int32 field4166 = 3;
+    optional .benchmarks.google_message3.Enum4160 field4167 = 9;
+    optional bytes field4168 = 4;
+    optional .benchmarks.google_message3.Enum4152 field4169 = 5;
+    optional string field4170 = 6;
+  }
+}
+
+message Message35573 {
+  optional fixed64 field35695 = 16;
+  optional string field35696 = 1000;
+  optional string field35697 = 1004;
+  optional int32 field35698 = 1003;
+  repeated group Message35574 = 1012 {
+  }
+  optional int64 field35700 = 1011;
+  optional int64 field35701 = 1005;
+  optional int64 field35702 = 1006;
+  optional int64 field35703 = 1007;
+  optional int64 field35704 = 1008;
+  repeated group Message35575 = 1 {
+    optional int64 field35709 = 2;
+    optional string field35710 = 3;
+    optional string field35711 = 19;
+    optional int32 field35712 = 20;
+    optional int32 field35713 = 21;
+    optional int32 field35714 = 22;
+    optional bool field35715 = 23;
+    optional int32 field35716 = 47;
+    optional int32 field35717 = 48;
+    optional bool field35718 = 24;
+    optional fixed64 field35719 = 25;
+    optional bytes field35720 = 52;
+    optional int32 field35721 = 18;
+    optional fixed32 field35722 = 43;
+    optional bool field35723 = 26;
+    optional int32 field35724 = 27;
+    optional int32 field35725 = 17;
+    optional bool field35726 = 45;
+    repeated int32 field35727 = 33;
+    repeated int32 field35728 = 58;
+    optional float field35729 = 34;
+    optional float field35730 = 1009;
+    optional int32 field35731 = 28;
+    repeated fixed64 field35732 = 1001;
+    repeated fixed64 field35733 = 1002;
+    optional int32 field35734 = 44;
+    optional int32 field35735 = 50;
+    optional int32 field35736 = 36;
+    optional int32 field35737 = 40;
+    optional bool field35738 = 1016;
+    optional bool field35739 = 1010;
+    optional int32 field35740 = 37;
+    optional int32 field35741 = 38;
+    optional string field35742 = 46;
+    optional uint32 field35743 = 60;
+    repeated bytes field35744 = 56;
+    optional .benchmarks.google_message3.Message0 field35745 = 57;
+    required group Message35576 = 4 {
+      optional fixed64 field35747 = 5;
+      optional int32 field35748 = 6;
+      optional int32 field35749 = 49;
+      optional int32 field35750 = 7;
+      optional uint32 field35751 = 59;
+      optional int32 field35752 = 14;
+      optional int32 field35753 = 15;
+      optional int32 field35754 = 35;
+      optional bytes field35755 = 53;
+      optional int32 field35756 = 8;
+      optional string field35757 = 9;
+      optional fixed64 field35758 = 10;
+      optional int32 field35759 = 11;
+      optional int32 field35760 = 12;
+      optional int32 field35761 = 41;
+      optional int32 field35762 = 30;
+      optional int32 field35763 = 31;
+      optional int32 field35764 = 13;
+      optional bytes field35765 = 39;
+      optional string field35766 = 29;
+      optional int32 field35767 = 42;
+      repeated int32 field35768 = 32;
+      repeated int32 field35769 = 51;
+      optional int64 field35770 = 54;
+      optional .benchmarks.google_message3.Message0 field35771 = 55;
+    }
+  }
+}
+
+message Message36858 {
+  repeated int32 field36956 = 1;
+  repeated string field36957 = 2;
+  repeated string field36958 = 12;
+  optional int32 field36959 = 3;
+  optional int32 field36960 = 4;
+  optional int32 field36961 = 14;
+  optional string field36962 = 11;
+  optional bool field36963 = 5;
+  optional bool field36964 = 13;
+  optional int64 field36965 = 6;
+  optional .benchmarks.google_message3.Message35506 field36966 = 7;
+  repeated group Message36859 = 8 {
+    required .benchmarks.google_message3.Enum36860 field36968 = 9;
+    optional float field36969 = 10;
+  }
+}
+
+message Message13174 {
+  required int32 field13237 = 6;
+  optional int32 field13238 = 3;
+  required int32 field13239 = 4;
+  optional int32 field13240 = 8;
+  optional double field13241 = 5;
+  optional double field13242 = 7;
+  optional int32 field13243 = 17;
+  optional int32 field13244 = 19;
+  optional double field13245 = 20;
+  optional int32 field13246 = 9;
+  optional double field13247 = 10;
+  optional int32 field13248 = 11;
+  optional .benchmarks.google_message3.Message13151 field13249 = 21;
+  optional int32 field13250 = 1;
+  optional double field13251 = 2;
+  optional double field13252 = 15;
+  optional double field13253 = 16;
+  optional double field13254 = 12;
+  optional double field13255 = 13;
+  optional double field13256 = 14;
+  optional int32 field13257 = 18;
+}
+
+message Message18283 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18478 = 1;
+  optional int32 field18479 = 4;
+  optional int32 field18480 = 106;
+  optional int32 field18481 = 107;
+  optional int32 field18482 = 108;
+  optional int32 field18483 = 109;
+  optional int32 field18484 = 105;
+  optional int32 field18485 = 113;
+  optional int32 field18486 = 114;
+  optional int32 field18487 = 124;
+  optional int32 field18488 = 125;
+  optional int32 field18489 = 128;
+  optional int32 field18490 = 135;
+  optional bool field18491 = 166;
+  optional bool field18492 = 136;
+  optional int32 field18493 = 140;
+  optional int32 field18494 = 171;
+  optional int32 field18495 = 148;
+  optional int32 field18496 = 145;
+  optional float field18497 = 117;
+  optional int32 field18498 = 146;
+  optional string field18499 = 3;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18500 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18501 = 6;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18502 = 9;
+  optional .benchmarks.google_message3.Message18253 field18503 = 155;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18504 = 184;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18505 = 163;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18506 = 16;
+  repeated int32 field18507 = 20;
+  repeated int32 field18508 = 7;
+  repeated string field18509 = 194;
+  optional bytes field18510 = 30;
+  optional int32 field18511 = 31;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18512 = 178;
+  optional string field18513 = 8;
+  optional float field18514 = 2;
+  optional float field18515 = 100;
+  optional float field18516 = 101;
+  optional float field18517 = 102;
+  optional int32 field18518 = 103;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field18519 = 104;
+  optional int32 field18520 = 110;
+  optional int32 field18521 = 112;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18522 = 111;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18523 = 115;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18524 = 119;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18525 = 127;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18526 = 185;
+  optional int32 field18527 = 120;
+  optional int32 field18528 = 132;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18529 = 126;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18530 = 129;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18531 = 131;
+  optional fixed64 field18532 = 150;
+  optional int32 field18533 = 133;
+  optional int32 field18534 = 134;
+  optional int32 field18535 = 139;
+  optional fixed64 field18536 = 137;
+  optional fixed64 field18537 = 138;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18538 = 141;
+  optional int32 field18539 = 142;
+  optional int32 field18540 = 181;
+  optional .benchmarks.google_message3.Message16816 field18541 = 143;
+  optional .benchmarks.google_message3.Message16685 field18542 = 154;
+  optional int32 field18543 = 144;
+  optional int64 field18544 = 147;
+  optional int64 field18545 = 149;
+  optional int32 field18546 = 151;
+  optional int32 field18547 = 152;
+  optional int32 field18548 = 153;
+  optional float field18549 = 161;
+  optional .benchmarks.google_message3.Message0 field18550 = 123;
+  repeated int64 field18551 = 156;
+  optional int32 field18552 = 157;
+  repeated fixed64 field18553 = 188;
+  optional int32 field18554 = 158;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18555 = 159;
+  optional bool field18556 = 160;
+  optional uint64 field18557 = 162;
+  optional int32 field18558 = 164;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18559 = 10;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18560 = 167;
+  optional int32 field18561 = 168;
+  repeated fixed64 field18562 = 169;
+  repeated string field18563 = 170;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18564 = 172;
+  optional int64 field18565 = 173;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18566 = 174;
+  optional int64 field18567 = 175;
+  optional uint32 field18568 = 189;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18569 = 176;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18570 = 177;
+  optional uint32 field18571 = 179;
+  optional uint32 field18572 = 180;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18573 = 182;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18574 = 183;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18575 = 121;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18576 = 186;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18577 = 187;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18578 = 190;
+  optional int32 field18579 = 191;
+  optional float field18580 = 192;
+  optional bool field18581 = 193;
+  extensions 116 to 116;
+  extensions 118 to 118;
+  extensions 130 to 130;
+  extensions 165 to 165;
+}
+
+message Message13169 {
+  repeated .benchmarks.google_message3.Message13168 field13223 = 1;
+  required .benchmarks.google_message3.Message13167 field13224 = 2;
+  optional string field13225 = 3;
+}
+
+message Message19255 {
+  optional string field19257 = 1;
+}
+
+message Message35542 {
+  optional bool field35543 = 1;
+  optional bool field35544 = 2;
+  optional bool field35545 = 3;
+}
+
+message Message3901 {
+  optional int32 field3990 = 1;
+  optional int32 field3991 = 2;
+  optional int32 field3992 = 3;
+  optional int32 field3993 = 4;
+  optional int32 field3994 = 7;
+  optional int32 field3995 = 8;
+  optional int32 field3996 = 9;
+  optional int32 field3997 = 10;
+  optional int32 field3998 = 11;
+  optional int32 field3999 = 12;
+  optional .benchmarks.google_message3.UnusedEnum field4000 = 6;
+  optional int32 field4001 = 5;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_3.proto b/benchmarks/datasets/google_message3/benchmark_message3_3.proto
new file mode 100644
index 00000000..e71d2661
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_3.proto
@@ -0,0 +1,466 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_4.proto";
+import "datasets/google_message3/benchmark_message3_5.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message35546 {
+  optional int64 field35556 = 1;
+  optional int32 field35557 = 2;
+  optional bool field35558 = 3;
+  optional int64 field35559 = 13;
+  optional group Message35547 = 4 {
+    required int32 field35569 = 5;
+    required int32 field35570 = 6;
+  }
+  optional group Message35548 = 10 {
+    required int64 field35571 = 11;
+    required int64 field35572 = 12;
+  }
+  optional bool field35562 = 14;
+  optional bool field35563 = 15;
+  optional int32 field35564 = 16;
+  optional bool field35565 = 17;
+  optional bool field35566 = 18;
+  optional string field35567 = 100;
+}
+
+message Message2356 {
+  optional .benchmarks.google_message3.Message1374 field2368 = 121;
+  optional uint64 field2369 = 1;
+  optional int32 field2370 = 2;
+  optional int32 field2371 = 17;
+  required string field2372 = 3;
+  optional int32 field2373 = 7;
+  optional bytes field2374 = 8;
+  optional string field2375 = 4;
+  optional string field2376 = 101;
+  optional int32 field2377 = 102;
+  optional int32 field2378 = 103;
+  optional int32 field2379 = 104;
+  optional int32 field2380 = 113;
+  optional int32 field2381 = 114;
+  optional int32 field2382 = 115;
+  optional int32 field2383 = 117;
+  optional int32 field2384 = 118;
+  optional int32 field2385 = 119;
+  optional int32 field2386 = 105;
+  optional bytes field2387 = 5;
+  optional group Message2357 = 6 {
+    optional int64 field2399 = 9;
+    optional int32 field2400 = 10;
+    optional int32 field2401 = 11;
+    optional int32 field2402 = 12;
+    optional int32 field2403 = 13;
+    optional int32 field2404 = 116;
+    optional int32 field2405 = 106;
+    required bytes field2406 = 14;
+    optional int32 field2407 = 45;
+    optional int32 field2408 = 112;
+    optional bool field2409 = 122;
+    optional bytes field2410 = 124;
+  }
+  optional string field2389 = 120;
+  optional group Message2358 = 107 {
+  }
+  repeated group Message2359 = 40 {
+    optional string field2413 = 41;
+    optional string field2414 = 42;
+    optional string field2415 = 43;
+    optional string field2416 = 44;
+    optional int32 field2417 = 46;
+    optional string field2418 = 47;
+    optional float field2419 = 110;
+    optional float field2420 = 111;
+  }
+  optional int32 field2392 = 50;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field2393 = 60;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field2394 = 70;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field2395 = 80;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field2396 = 90;
+  optional string field2397 = 100;
+  optional string field2398 = 123;
+}
+
+message Message7029 {
+  required int32 field7183 = 1;
+  optional int32 field7184 = 2;
+  optional int32 field7185 = 3;
+  optional int32 field7186 = 4;
+  optional int32 field7187 = 5;
+  optional int32 field7188 = 6;
+  optional int32 field7189 = 17;
+  optional int32 field7190 = 18;
+  optional int32 field7191 = 49;
+  optional int32 field7192 = 28;
+  optional int32 field7193 = 33;
+  optional int32 field7194 = 25;
+  optional int32 field7195 = 26;
+  optional int32 field7196 = 40;
+  optional int32 field7197 = 41;
+  optional int32 field7198 = 42;
+  optional int32 field7199 = 43;
+  optional int32 field7200 = 19;
+  optional int32 field7201 = 7;
+  optional int32 field7202 = 8;
+  optional int32 field7203 = 9;
+  optional int32 field7204 = 10;
+  optional int32 field7205 = 11;
+  optional int32 field7206 = 12;
+  repeated group Message7030 = 13 {
+    optional string field7226 = 14;
+    optional string field7227 = 15;
+    optional int64 field7228 = 16;
+  }
+  repeated group Message7031 = 21 {
+    optional string field7229 = 22;
+    optional int32 field7230 = 23;
+    optional int32 field7231 = 24;
+    optional int32 field7232 = 30;
+    optional int32 field7233 = 31;
+    optional int32 field7234 = 35;
+  }
+  optional int32 field7209 = 20;
+  optional float field7210 = 27;
+  optional int32 field7211 = 29;
+  optional int32 field7212 = 32;
+  optional string field7213 = 48;
+  optional bool field7214 = 34;
+  optional int32 field7215 = 36;
+  optional float field7216 = 37;
+  optional bool field7217 = 38;
+  optional bool field7218 = 39;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field7219 = 44;
+  optional int32 field7220 = 45;
+  optional int32 field7221 = 46;
+  optional int32 field7222 = 47;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field7223 = 50;
+  optional int32 field7224 = 51;
+}
+
+message Message35538 {
+  required int64 field35539 = 1;
+}
+
+message Message18921 {
+  optional string field18946 = 1;
+  optional fixed64 field18947 = 2;
+  optional int32 field18948 = 3;
+  optional double field18949 = 4;
+  optional bool field18950 = 17;
+  optional bool field18951 = 23;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field18952 = 24;
+  repeated group Message18922 = 5 {
+    optional uint64 field18959 = 6;
+    optional string field18960 = 13;
+    optional bool field18961 = 21;
+    optional bool field18962 = 33;
+    optional int32 field18963 = 7;
+    optional int32 field18964 = 8;
+    optional string field18965 = 9;
+    optional .benchmarks.google_message3.Message18856 field18966 = 10;
+    optional uint64 field18967 = 34;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18968 = 11;
+    optional uint64 field18969 = 35;
+    optional float field18970 = 12;
+    repeated string field18971 = 14;
+    optional bool field18972 = 15;
+    optional bool field18973 = 16;
+    optional float field18974 = 22;
+    optional int32 field18975 = 18;
+    optional int32 field18976 = 19;
+    optional int32 field18977 = 20;
+    optional .benchmarks.google_message3.UnusedEmptyMessage field18978 = 25;
+    optional .benchmarks.google_message3.UnusedEnum field18979 = 26;
+    repeated string field18980 = 27;
+    optional float field18981 = 28;
+  }
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field18954 = 29;
+  repeated .benchmarks.google_message3.Message18943 field18955 = 30;
+  repeated .benchmarks.google_message3.Message18944 field18956 = 31;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field18957 = 32;
+}
+
+message Message35540 {
+  optional bool field35541 = 1;
+}
+
+message Message3886 {
+  repeated group Message3887 = 1 {
+    required string field3932 = 2;
+    optional string field3933 = 9;
+    optional .benchmarks.google_message3.Message3850 field3934 = 3;
+    optional bytes field3935 = 8;
+  }
+}
+
+message Message6743 {
+  optional .benchmarks.google_message3.Message6721 field6759 = 1;
+  optional .benchmarks.google_message3.Message6723 field6760 = 2;
+  optional .benchmarks.google_message3.Message6723 field6761 = 8;
+  optional .benchmarks.google_message3.Message6725 field6762 = 3;
+  optional .benchmarks.google_message3.Message6726 field6763 = 4;
+  optional .benchmarks.google_message3.Message6733 field6764 = 5;
+  optional .benchmarks.google_message3.Message6734 field6765 = 6;
+  optional .benchmarks.google_message3.Message6742 field6766 = 7;
+}
+
+message Message6773 {
+  optional .benchmarks.google_message3.Enum6769 field6794 = 1;
+  optional int32 field6795 = 9;
+  optional .benchmarks.google_message3.UnusedEnum field6796 = 10;
+  optional int32 field6797 = 11;
+  optional int32 field6798 = 2;
+  optional .benchmarks.google_message3.Enum6774 field6799 = 3;
+  optional double field6800 = 5;
+  optional double field6801 = 7;
+  optional double field6802 = 8;
+  optional .benchmarks.google_message3.Enum6782 field6803 = 6;
+}
+
+message Message8224 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8255 = 1;
+  optional .benchmarks.google_message3.Message8184 field8256 = 2;
+  optional .benchmarks.google_message3.Message7966 field8257 = 3;
+  optional string field8258 = 4;
+  optional string field8259 = 5;
+  optional bool field8260 = 6;
+  optional int64 field8261 = 7;
+  optional string field8262 = 8;
+  optional int64 field8263 = 9;
+  optional double field8264 = 10;
+  optional int64 field8265 = 11;
+  repeated string field8266 = 12;
+  optional int64 field8267 = 13;
+  optional int32 field8268 = 14;
+  optional int32 field8269 = 15;
+  optional int64 field8270 = 16;
+  optional double field8271 = 17;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8272 = 18;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8273 = 19;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8274 = 20;
+  optional bool field8275 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8276 = 22;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8277 = 23;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8278 = 24;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8279 = 25;
+  optional bool field8280 = 26;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8281 = 27;
+}
+
+message Message8392 {
+  optional string field8395 = 1;
+  optional string field8396 = 2;
+  optional .benchmarks.google_message3.Message7966 field8397 = 3;
+  optional string field8398 = 4;
+  optional string field8399 = 5;
+  optional string field8400 = 6;
+  optional string field8401 = 7;
+  optional string field8402 = 8;
+  optional string field8403 = 9;
+}
+
+message Message8130 {
+  optional string field8156 = 1;
+  optional string field8157 = 2;
+  optional string field8158 = 4;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8159 = 6;
+  repeated string field8160 = 7;
+  optional int64 field8161 = 8;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8162 = 9;
+  optional string field8163 = 10;
+  optional string field8164 = 11;
+  optional string field8165 = 12;
+  optional string field8166 = 13;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8167 = 14;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8168 = 15;
+  optional string field8169 = 16;
+  optional .benchmarks.google_message3.UnusedEnum field8170 = 17;
+  optional .benchmarks.google_message3.UnusedEnum field8171 = 18;
+  optional bool field8172 = 19;
+  optional bool field8173 = 20;
+  optional double field8174 = 21;
+  optional int32 field8175 = 22;
+  optional int32 field8176 = 23;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8177 = 24;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8178 = 25;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8179 = 26;
+}
+
+message Message8478 {
+  optional string field8489 = 7;
+  optional .benchmarks.google_message3.Message7966 field8490 = 1;
+  optional .benchmarks.google_message3.Message8476 field8491 = 2;
+  optional int64 field8492 = 3;
+  optional .benchmarks.google_message3.Message8476 field8493 = 4;
+  repeated .benchmarks.google_message3.Message8477 field8494 = 5;
+  optional .benchmarks.google_message3.Message8454 field8495 = 6;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8496 = 8;
+}
+
+message Message8479 {
+  optional .benchmarks.google_message3.Message8475 field8497 = 1;
+  optional .benchmarks.google_message3.Message7966 field8498 = 2;
+  optional .benchmarks.google_message3.Message8476 field8499 = 3;
+  optional .benchmarks.google_message3.Message8476 field8500 = 4;
+  optional string field8501 = 6;
+  optional string field8502 = 7;
+  optional .benchmarks.google_message3.Message7966 field8503 = 8;
+  optional .benchmarks.google_message3.Message8455 field8504 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8505 = 9;
+}
+
+message Message10319 {
+  optional .benchmarks.google_message3.Enum10325 field10340 = 1;
+  optional int32 field10341 = 4;
+  optional int32 field10342 = 5;
+  optional bytes field10343 = 3;
+  optional string field10344 = 2;
+  optional string field10345 = 6;
+  optional string field10346 = 7;
+}
+
+message Message4016 {
+  required int32 field4017 = 1;
+  required int32 field4018 = 2;
+  required int32 field4019 = 3;
+  required int32 field4020 = 4;
+}
+
+message Message12669 {
+  optional .benchmarks.google_message3.Message12559 field12681 = 1;
+  optional float field12682 = 2;
+  optional bool field12683 = 3;
+  optional .benchmarks.google_message3.Enum12670 field12684 = 4;
+}
+
+message Message12819 {
+  optional double field12834 = 1;
+  optional double field12835 = 2;
+  optional double field12836 = 3;
+  optional double field12837 = 4;
+  optional double field12838 = 5;
+  optional double field12839 = 6;
+}
+
+message Message12820 {
+  optional int32 field12840 = 1;
+  optional int32 field12841 = 2;
+  optional int32 field12842 = 3;
+  optional int32 field12843 = 8;
+  optional int32 field12844 = 4;
+  optional int32 field12845 = 5;
+  optional int32 field12846 = 6;
+  optional int32 field12847 = 7;
+}
+
+message Message12821 {
+  optional int32 field12848 = 1;
+  optional int32 field12849 = 2;
+  optional int32 field12850 = 3;
+  optional int32 field12851 = 4;
+  optional int32 field12852 = 5;
+}
+
+message Message12818 {
+  optional uint64 field12829 = 1;
+  optional int32 field12830 = 2;
+  optional int32 field12831 = 3;
+  optional int32 field12832 = 5;
+  repeated .benchmarks.google_message3.Message12817 field12833 = 4;
+}
+
+message Message16479 {
+  optional .benchmarks.google_message3.Message16480 field16484 = 1;
+  optional int32 field16485 = 5;
+  optional float field16486 = 2;
+  optional uint32 field16487 = 4;
+  optional bool field16488 = 3;
+  optional uint32 field16489 = 6;
+}
+
+message Message16722 {
+  optional string field16752 = 1;
+  optional string field16753 = 2;
+  optional string field16754 = 3;
+  optional int32 field16755 = 5;
+  optional string field16756 = 4;
+}
+
+message Message16724 {
+  optional int64 field16761 = 1;
+  optional float field16762 = 2;
+  optional int64 field16763 = 3;
+  optional int64 field16764 = 4;
+  optional bool field16765 = 5;
+  repeated string field16766 = 6;
+  repeated string field16767 = 7;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field16768 = 8;
+  optional bool field16769 = 9;
+  optional uint32 field16770 = 10;
+  optional .benchmarks.google_message3.Enum16728 field16771 = 11;
+  repeated int32 field16772 = 12;
+  optional bool field16773 = 13;
+}
+
+message Message17728 {
+}
+
+message Message24356 {
+  optional string field24559 = 1;
+  optional string field24560 = 2;
+  optional int32 field24561 = 14;
+  optional string field24562 = 3;
+  optional string field24563 = 4;
+  optional string field24564 = 5;
+  optional .benchmarks.google_message3.UnusedEnum field24565 = 13;
+  optional string field24566 = 6;
+  optional .benchmarks.google_message3.Enum24361 field24567 = 12;
+  optional string field24568 = 7;
+  optional string field24569 = 8;
+  optional string field24570 = 9;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24571 = 10;
+  repeated string field24572 = 11;
+  repeated string field24573 = 15;
+}
+
+message Message24376 {
+  optional string field24589 = 1;
+  optional string field24590 = 2;
+  optional string field24591 = 3;
+  required .benchmarks.google_message3.Message24377 field24592 = 4;
+  optional .benchmarks.google_message3.Message24317 field24593 = 5;
+  optional string field24594 = 6;
+  optional .benchmarks.google_message3.Message24378 field24595 = 7;
+  repeated string field24596 = 8;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24597 = 14;
+  repeated string field24598 = 9;
+  repeated string field24599 = 10;
+  repeated string field24600 = 11;
+  optional string field24601 = 12;
+  repeated string field24602 = 13;
+}
+
+message Message24366 {
+  optional string field24574 = 1;
+  optional string field24575 = 2;
+  optional string field24576 = 3;
+  optional int32 field24577 = 10;
+  optional string field24578 = 13;
+  optional string field24579 = 4;
+  optional string field24580 = 5;
+  optional .benchmarks.google_message3.UnusedEnum field24581 = 9;
+  optional string field24582 = 14;
+  optional .benchmarks.google_message3.UnusedEnum field24583 = 15;
+  optional string field24584 = 6;
+  optional string field24585 = 12;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24586 = 7;
+  repeated string field24587 = 8;
+  repeated string field24588 = 11;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_4.proto b/benchmarks/datasets/google_message3/benchmark_message3_4.proto
new file mode 100644
index 00000000..597cec6d
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_4.proto
@@ -0,0 +1,491 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_5.proto";
+import "datasets/google_message3/benchmark_message3_6.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message24346 {
+}
+
+message Message24401 {
+  optional .benchmarks.google_message3.Message24400 field24679 = 1;
+}
+
+message Message24402 {
+  optional .benchmarks.google_message3.Message24400 field24680 = 1;
+}
+
+message Message24379 {
+  optional string field24603 = 1;
+  optional string field24604 = 2;
+  optional string field24605 = 3;
+  required .benchmarks.google_message3.Message24380 field24606 = 4;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24607 = 5;
+  optional string field24608 = 6;
+  optional .benchmarks.google_message3.Message24381 field24609 = 7;
+  repeated string field24610 = 8;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24611 = 17;
+  repeated string field24612 = 9;
+  repeated string field24613 = 10;
+  repeated string field24614 = 11;
+  optional string field24615 = 14;
+  optional string field24616 = 12;
+  optional string field24617 = 16;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24618 = 13;
+  repeated string field24619 = 15;
+  repeated string field24620 = 18;
+}
+
+message Message27358 {
+  optional int32 field27415 = 1;
+  optional int32 field27416 = 2;
+}
+
+message Message34381 {
+  optional string field34398 = 1;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34399 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34400 = 3;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34401 = 4;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34402 = 5;
+  optional bool field34403 = 6;
+  optional bool field34404 = 7;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34405 = 8;
+  optional bool field34406 = 9;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34407 = 10;
+}
+
+message Message34619 {
+  optional double field34641 = 1;
+  optional double field34642 = 2;
+  optional double field34643 = 3;
+  optional double field34644 = 4;
+  optional double field34645 = 11;
+  optional double field34646 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field34647 = 100;
+}
+
+message Message730 {
+  optional string field897 = 19;
+  repeated string field898 = 27;
+  repeated string field899 = 28;
+  repeated string field900 = 21;
+  optional string field901 = 30;
+  repeated uint32 field902 = 20;
+  repeated uint32 field903 = 32;
+  repeated string field904 = 16;
+  repeated .benchmarks.google_message3.Message697 field905 = 6;
+  repeated .benchmarks.google_message3.Message704 field906 = 7;
+  repeated string field907 = 18;
+  repeated .benchmarks.google_message3.Message703 field908 = 8;
+  repeated string field909 = 9;
+  optional .benchmarks.google_message3.Message716 field910 = 10;
+  optional .benchmarks.google_message3.Message718 field911 = 11;
+  optional bool field912 = 14;
+  repeated .benchmarks.google_message3.Message715 field913 = 4;
+  repeated string field914 = 17;
+  repeated string field915 = 23;
+  repeated .benchmarks.google_message3.Message719 field916 = 24;
+  repeated .benchmarks.google_message3.Message728 field917 = 26;
+  repeated .benchmarks.google_message3.Message702 field918 = 35;
+  optional string field919 = 36;
+  repeated string field920 = 37;
+  optional int64 field921 = 38;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field922 = 39;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field923 = 1;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field924 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field925 = 3;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field926 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field927 = 13;
+  repeated string field928 = 22;
+  optional bytes field929 = 31;
+  extensions 25 to 25;
+  extensions 29 to 29;
+  extensions 34 to 34;
+  extensions 15 to 15;
+}
+
+message Message33958 {
+  optional string field33977 = 1;
+  optional string field33978 = 9;
+  repeated group Message33959 = 2 {
+    required string field33982 = 3;
+    optional string field33983 = 4;
+    optional string field33984 = 5;
+    optional fixed64 field33985 = 8;
+    optional bool field33986 = 10;
+    optional .benchmarks.google_message3.Message0 field33987 = 6;
+  }
+  optional .benchmarks.google_message3.Enum33960 field33980 = 7;
+  extend .benchmarks.google_message3.Message0 {
+    optional .benchmarks.google_message3.Message33958 field33981 = 10747482;
+  }
+}
+
+message Message6637 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6670 = 2;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field6671 = 1;
+  optional int32 field6672 = 3;
+  repeated string field6673 = 4;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6674 = 5;
+}
+
+message Message6643 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6683 = 3;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6684 = 4;
+  optional double field6685 = 5;
+  optional double field6686 = 6;
+  optional int32 field6687 = 1;
+  optional int32 field6688 = 2;
+  optional double field6689 = 9;
+  optional bytes field6690 = 10;
+  optional int32 field6691 = 11;
+  optional bool field6692 = 12;
+  optional bool field6693 = 13;
+  optional .benchmarks.google_message3.Message6578 field6694 = 15;
+  optional .benchmarks.google_message3.UnusedEnum field6695 = 16;
+  optional int64 field6696 = 17;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field6697 = 22;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6698 = 19;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6699 = 20;
+  optional int32 field6700 = 21;
+}
+
+message Message6126 {
+  required string field6152 = 1;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field6153 = 9;
+  optional int32 field6154 = 14;
+  optional bytes field6155 = 10;
+  optional .benchmarks.google_message3.Message6024 field6156 = 12;
+  optional int32 field6157 = 4;
+  optional string field6158 = 5;
+  optional int32 field6159 = 6;
+  repeated int32 field6160 = 2;
+  repeated int32 field6161 = 3;
+  repeated .benchmarks.google_message3.Message6052 field6162 = 7;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field6163 = 11;
+  optional .benchmarks.google_message3.Enum6065 field6164 = 15;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field6165 = 8;
+  optional bool field6166 = 13;
+  optional bool field6167 = 16;
+  optional bool field6168 = 18;
+  repeated .benchmarks.google_message3.Message6054 field6169 = 17;
+  optional int32 field6170 = 19;
+}
+
+message Message13083 {
+  optional float field13096 = 1;
+  repeated group Message13084 = 2 {
+    required float field13107 = 3;
+    required int32 field13108 = 4;
+    optional float field13109 = 5;
+    repeated .benchmarks.google_message3.Enum13092 field13110 = 6;
+  }
+  optional float field13098 = 44;
+  optional float field13099 = 45;
+  optional uint64 field13100 = 46;
+  optional float field13101 = 47;
+  optional group Message13085 = 16 {
+  }
+  repeated group Message13086 = 23 {
+  }
+  repeated group Message13087 = 29 {
+  }
+  optional .benchmarks.google_message3.UnusedEmptyMessage field13105 = 43;
+}
+
+message Message13088 {
+  repeated group Message13089 = 1 {
+    required string field13139 = 2;
+    optional float field13140 = 3;
+  }
+  optional int64 field13136 = 4;
+  optional bool field13137 = 5;
+}
+
+message Message10391 {
+  optional .benchmarks.google_message3.Enum10392 field10411 = 1;
+  optional .benchmarks.google_message3.UnusedEnum field10412 = 2;
+  optional int64 field10413 = 3;
+  optional string field10414 = 4;
+  optional string field10415 = 5;
+  optional bytes field10416 = 6;
+  optional bool field10417 = 8;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field10418 = 9;
+  optional bool field10419 = 10;
+}
+
+message Message11873 {
+  optional string field11876 = 1;
+  optional string field11877 = 4;
+  optional .benchmarks.google_message3.Message10573 field11878 = 5;
+  optional .benchmarks.google_message3.Message10582 field11879 = 6;
+  optional .benchmarks.google_message3.Message10824 field11880 = 7;
+  optional .benchmarks.google_message3.Message10773 field11881 = 12;
+  optional .benchmarks.google_message3.Message11866 field11882 = 8;
+  optional .benchmarks.google_message3.Message10818 field11883 = 13;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field11884 = 16;
+  optional .benchmarks.google_message3.Message10155 field11885 = 11;
+  optional .benchmarks.google_message3.Message10469 field11886 = 14;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field11887 = 15;
+  extensions 9 to 9;
+  extensions 10 to 10;
+}
+
+message Message35506 {
+  optional int32 field35524 = 1;
+  optional string field35525 = 2;
+  optional .benchmarks.google_message3.Enum35507 field35526 = 3;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field35527 = 4;
+}
+
+message Message13151 {
+  repeated .benchmarks.google_message3.Message13145 field13158 = 1;
+}
+
+message Message18253 {
+  repeated group Message18254 = 1 {
+    required fixed64 field18362 = 2;
+    required double field18363 = 3;
+  }
+}
+
+message Message16685 {
+  repeated .benchmarks.google_message3.Message16686 field16694 = 2;
+}
+
+message Message16816 {
+  optional float field16826 = 1;
+  optional .benchmarks.google_message3.Enum16819 field16827 = 2;
+  optional float field16828 = 3;
+  repeated group Message16817 = 4 {
+  }
+  optional bool field16830 = 7;
+  optional bool field16831 = 8;
+  repeated group Message16818 = 12 {
+  }
+  optional string field16833 = 10;
+  optional bool field16834 = 13;
+  optional bool field16835 = 14;
+}
+
+message Message13168 {
+  required int32 field13212 = 1;
+  optional fixed64 field13213 = 7;
+  optional bool field13214 = 8;
+  optional fixed64 field13215 = 10;
+  optional bool field13216 = 11;
+  optional .benchmarks.google_message3.Message12796 field13217 = 9;
+  required double field13218 = 2;
+  required bool field13219 = 3;
+  optional int32 field13220 = 4;
+  required bool field13221 = 5;
+  optional int32 field13222 = 6;
+}
+
+message Message13167 {
+  required int32 field13199 = 1;
+  optional int32 field13200 = 2;
+  optional int32 field13201 = 3;
+  optional bool field13202 = 8;
+  optional fixed64 field13203 = 12;
+  optional bool field13204 = 13;
+  optional .benchmarks.google_message3.Message12796 field13205 = 11;
+  optional fixed64 field13206 = 9;
+  optional bool field13207 = 10;
+  repeated int32 field13208 = 4;
+  optional int32 field13209 = 5;
+  optional int32 field13210 = 6;
+  optional int32 field13211 = 7;
+}
+
+message Message1374 {
+  required string field1375 = 1;
+  optional string field1376 = 2;
+}
+
+message Message18943 {
+}
+
+message Message18944 {
+}
+
+message Message18856 {
+  optional string field18857 = 1;
+  optional string field18858 = 2;
+  optional bool field18859 = 31;
+  optional string field18860 = 26;
+  optional string field18861 = 3;
+  optional string field18862 = 4;
+  optional string field18863 = 5;
+  optional string field18864 = 17;
+  optional string field18865 = 6;
+  optional string field18866 = 7;
+  optional string field18867 = 8;
+  optional string field18868 = 9;
+  optional string field18869 = 10;
+  optional string field18870 = 11;
+  optional string field18871 = 21;
+  optional string field18872 = 18;
+  optional string field18873 = 19;
+  optional string field18874 = 20;
+  optional string field18875 = 22;
+  optional string field18876 = 23;
+  optional string field18877 = 24;
+  optional string field18878 = 25;
+  optional string field18879 = 12;
+  optional string field18880 = 13;
+  optional string field18881 = 29;
+  optional string field18882 = 30;
+  optional string field18883 = 15;
+  optional string field18884 = 16;
+  repeated string field18885 = 14;
+  optional string field18886 = 27;
+  optional string field18887 = 28;
+}
+
+message Message3850 {
+  optional .benchmarks.google_message3.Enum3851 field3924 = 2;
+  optional bool field3925 = 12;
+  optional int32 field3926 = 4;
+  optional bool field3927 = 10;
+  optional bool field3928 = 13;
+  optional bool field3929 = 14;
+}
+
+message Message6721 {
+  optional .benchmarks.google_message3.Message6722 field6744 = 1;
+  optional bool field6745 = 2;
+  optional bool field6746 = 3;
+  optional bool field6747 = 4;
+}
+
+message Message6742 {
+  optional bool field6758 = 1;
+}
+
+message Message6726 {
+  optional int64 field6752 = 1;
+  repeated .benchmarks.google_message3.Message6727 field6753 = 2;
+}
+
+message Message6733 {
+  optional int64 field6754 = 1;
+  optional int64 field6755 = 2;
+  optional bool field6756 = 3;
+}
+
+message Message6723 {
+  optional int64 field6748 = 1;
+  repeated .benchmarks.google_message3.Message6724 field6749 = 2;
+}
+
+message Message6725 {
+  optional int32 field6750 = 1;
+  optional int32 field6751 = 2;
+}
+
+message Message6734 {
+  repeated .benchmarks.google_message3.Message6735 field6757 = 1;
+}
+
+message Message8184 {
+  optional .benchmarks.google_message3.Message7966 field8228 = 1;
+  optional bool field8229 = 2;
+  repeated .benchmarks.google_message3.Message8183 field8230 = 3;
+}
+
+message Message8477 {
+  optional .benchmarks.google_message3.Message7966 field8486 = 1;
+  optional int64 field8487 = 2;
+  optional string field8488 = 3;
+}
+
+message Message8454 {
+  optional .benchmarks.google_message3.Message8449 field8465 = 1;
+  optional int64 field8466 = 3;
+  optional int32 field8467 = 4;
+  optional bool field8468 = 5;
+  extend .benchmarks.google_message3.Message8301 {
+    optional .benchmarks.google_message3.Message8454 field8469 = 66;
+  }
+}
+
+message Message8476 {
+  optional string field8483 = 1;
+  optional string field8484 = 2;
+  optional string field8485 = 3;
+}
+
+message Message8455 {
+  optional .benchmarks.google_message3.Message8449 field8470 = 1;
+  repeated .benchmarks.google_message3.Message8456 field8471 = 2;
+  optional .benchmarks.google_message3.Message8457 field8472 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8473 = 6;
+  extend .benchmarks.google_message3.Message8302 {
+    optional .benchmarks.google_message3.Message8455 field8474 = 66;
+  }
+}
+
+message Message8475 {
+  optional string field8481 = 1;
+  optional int64 field8482 = 2;
+}
+
+message Message12559 {
+}
+
+message Message12817 {
+  optional int32 field12826 = 1;
+  optional int32 field12827 = 2;
+  optional int32 field12828 = 3;
+}
+
+message Message16480 {
+  optional .benchmarks.google_message3.Message13358 field16490 = 1;
+  optional .benchmarks.google_message3.Enum16042 field16491 = 2;
+  optional .benchmarks.google_message3.Message13912 field16492 = 3;
+  optional string field16493 = 4;
+  optional string field16494 = 5;
+  optional string field16495 = 6;
+  optional string field16496 = 7;
+  optional .benchmarks.google_message3.Message13358 field16497 = 8;
+  optional fixed32 field16498 = 9;
+}
+
+message Message24317 {
+  optional string field24446 = 1;
+  optional .benchmarks.google_message3.Message24312 field24447 = 2;
+  repeated .benchmarks.google_message3.Message24315 field24448 = 3;
+  repeated .benchmarks.google_message3.Message24313 field24449 = 4;
+  repeated .benchmarks.google_message3.Message24316 field24450 = 5;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field24451 = 6;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field24452 = 7;
+  repeated string field24453 = 8;
+  repeated string field24454 = 9;
+  repeated string field24455 = 10;
+  repeated string field24456 = 28;
+  optional string field24457 = 11;
+  optional string field24458 = 12;
+  optional string field24459 = 13;
+  optional string field24460 = 14;
+  repeated string field24461 = 15;
+  optional string field24462 = 16;
+  repeated string field24463 = 17;
+  repeated string field24464 = 18;
+  repeated string field24465 = 19;
+  repeated string field24466 = 20;
+  repeated string field24467 = 21;
+  repeated string field24468 = 22;
+  repeated string field24469 = 23;
+  repeated string field24470 = 24;
+  optional string field24471 = 25;
+  optional string field24472 = 26;
+  repeated string field24473 = 27;
+  optional bool field24474 = 40;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_5.proto b/benchmarks/datasets/google_message3/benchmark_message3_5.proto
new file mode 100644
index 00000000..bc6cbc1c
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_5.proto
@@ -0,0 +1,473 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_6.proto";
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message24377 {
+}
+
+message Message24378 {
+}
+
+message Message24400 {
+  optional int32 field24674 = 1;
+  optional int32 field24675 = 2;
+  optional int32 field24676 = 3;
+  optional int32 field24677 = 4;
+  optional int32 field24678 = 5;
+}
+
+message Message24380 {
+}
+
+message Message24381 {
+}
+
+message Message719 {
+  repeated string field881 = 1;
+  repeated string field882 = 2;
+  repeated string field883 = 3;
+  optional .benchmarks.google_message3.Enum720 field884 = 4;
+}
+
+message Message728 {
+  required string field887 = 1;
+  repeated string field888 = 2;
+  repeated .benchmarks.google_message3.Message703 field889 = 3;
+  repeated .benchmarks.google_message3.Message715 field890 = 4;
+  repeated string field891 = 5;
+  repeated string field892 = 6;
+  optional .benchmarks.google_message3.Message718 field893 = 7;
+  optional .benchmarks.google_message3.Message716 field894 = 8;
+  repeated string field895 = 9;
+  extensions 10 to 10;
+  extensions 11 to 11;
+  extensions 12 to 12;
+}
+
+message Message704 {
+  optional string field800 = 1;
+  optional string field801 = 7;
+  optional string field802 = 2;
+  optional string field803 = 3;
+  optional string field804 = 4;
+  optional string field805 = 5;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field806 = 6;
+}
+
+message Message697 {
+  optional string field743 = 7;
+  repeated string field744 = 1;
+  repeated string field745 = 2;
+  repeated string field746 = 33;
+  repeated string field747 = 29;
+  repeated string field748 = 30;
+  repeated string field749 = 31;
+  repeated string field750 = 32;
+  repeated string field751 = 13;
+  repeated string field752 = 6;
+  repeated string field753 = 3;
+  repeated string field754 = 14;
+  repeated string field755 = 15;
+  repeated string field756 = 16;
+  repeated string field757 = 4;
+  repeated string field758 = 34;
+  repeated string field759 = 35;
+  repeated string field760 = 5;
+  repeated string field761 = 17;
+  repeated string field762 = 18;
+  repeated string field763 = 19;
+  optional bool field764 = 36;
+  repeated string field765 = 8;
+  repeated string field766 = 9;
+  optional string field767 = 27;
+  optional bool field768 = 25;
+  optional .benchmarks.google_message3.Message700 field769 = 10;
+  optional bool field770 = 11;
+  optional bool field771 = 24;
+  repeated string field772 = 12;
+  repeated string field773 = 20;
+  repeated string field774 = 21;
+  repeated string field775 = 22;
+  repeated .benchmarks.google_message3.Message699 field776 = 23;
+  repeated .benchmarks.google_message3.Message698 field777 = 37;
+  optional int64 field778 = 38;
+  extensions 28 to 28;
+  extensions 26 to 26;
+}
+
+message Message0 {
+  option message_set_wire_format = true;
+  extensions 4 to 2147483646;
+}
+
+message Message6578 {
+  optional .benchmarks.google_message3.Enum6579 field6632 = 1;
+  optional .benchmarks.google_message3.Enum6588 field6633 = 2;
+}
+
+message Message6024 {
+  optional .benchmarks.google_message3.Enum6025 field6048 = 1;
+  optional string field6049 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field6050 = 3;
+}
+
+message Message6052 {
+  required string field6084 = 1;
+  required bytes field6085 = 2;
+}
+
+message Message6054 {
+  required string field6089 = 1;
+  optional string field6090 = 2;
+}
+
+message Message10573 {
+  repeated .benchmarks.google_message3.Message10576 field10580 = 1;
+  optional string field10581 = 2;
+  extensions 10000 to 536870911;
+}
+
+message Message10824 {
+  required string field10825 = 1;
+  optional int32 field10826 = 2;
+}
+
+message Message10582 {
+  required bool field10583 = 1;
+  required double field10584 = 2;
+  optional bool field10585 = 3;
+  optional double field10586 = 4;
+  optional double field10587 = 5;
+  optional bool field10588 = 6;
+}
+
+message Message10155 {
+  required int32 field10195 = 1;
+  required int32 field10196 = 2;
+  optional .benchmarks.google_message3.Enum10157 field10197 = 59;
+  optional int32 field10198 = 18;
+  optional int32 field10199 = 19;
+  optional int32 field10200 = 21;
+  repeated group Message10156 = 50 {
+    optional .benchmarks.google_message3.Enum8862 field10266 = 51;
+    optional int32 field10267 = 52;
+    optional int32 field10268 = 53;
+    optional int32 field10269 = 54;
+  }
+  optional int32 field10202 = 3;
+  optional int32 field10203 = 4;
+  optional int32 field10204 = 5;
+  optional bool field10205 = 84;
+  optional bool field10206 = 33;
+  optional int32 field10207 = 75;
+  optional float field10208 = 26;
+  optional int32 field10209 = 27;
+  optional int32 field10210 = 49;
+  optional int32 field10211 = 10;
+  optional float field10212 = 78;
+  optional .benchmarks.google_message3.Message9151 field10213 = 91;
+  optional int32 field10214 = 11;
+  optional int32 field10215 = 12;
+  optional float field10216 = 41;
+  optional .benchmarks.google_message3.Message10154 field10217 = 61;
+  optional int32 field10218 = 23;
+  optional bytes field10219 = 24;
+  optional int32 field10220 = 65;
+  repeated bytes field10221 = 66;
+  optional int32 field10222 = 70;
+  optional bytes field10223 = 71;
+  repeated fixed64 field10224 = 73;
+  optional float field10225 = 29;
+  optional int32 field10226 = 30;
+  optional float field10227 = 31;
+  optional int32 field10228 = 32;
+  optional float field10229 = 34;
+  optional int32 field10230 = 35;
+  optional string field10231 = 22;
+  optional fixed64 field10232 = 13;
+  optional fixed64 field10233 = 20;
+  optional bool field10234 = 79;
+  repeated .benchmarks.google_message3.Enum10167 field10235 = 80 [packed = true];
+  optional int32 field10236 = 14;
+  optional int32 field10237 = 15;
+  optional int32 field10238 = 28;
+  repeated string field10239 = 16;
+  optional .benchmarks.google_message3.Message9182 field10240 = 17;
+  optional int32 field10241 = 63;
+  optional float field10242 = 64;
+  optional float field10243 = 37;
+  repeated float field10244 = 43;
+  optional int32 field10245 = 44;
+  optional .benchmarks.google_message3.Message9242 field10246 = 45;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field10247 = 46;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field10248 = 62;
+  optional .benchmarks.google_message3.Message8944 field10249 = 48;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field10250 = 87;
+  optional int32 field10251 = 58;
+  optional int32 field10252 = 92;
+  optional .benchmarks.google_message3.Message9123 field10253 = 93;
+  optional .benchmarks.google_message3.Message9160 field10254 = 60;
+  optional .benchmarks.google_message3.Message8890 field10255 = 67;
+  optional string field10256 = 69;
+  optional int64 field10257 = 74;
+  optional float field10258 = 82;
+  optional float field10259 = 85;
+  optional float field10260 = 86;
+  optional int64 field10261 = 83;
+  optional string field10262 = 77;
+  optional bool field10263 = 88;
+  repeated .benchmarks.google_message3.Message9628 field10264 = 94;
+  extensions 57 to 57;
+  extensions 1000 to 536870911;
+}
+
+message Message11866 {
+  required .benchmarks.google_message3.Message11014 field11868 = 1;
+  optional bool field11869 = 2;
+  optional double field11870 = 3;
+  optional double field11871 = 4;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field11872 = 5;
+}
+
+message Message10469 {
+  optional string field10473 = 1;
+  optional float field10474 = 2;
+  optional int32 field10475 = 3;
+  optional int32 field10476 = 4;
+  optional int32 field10477 = 5;
+  optional bool field10478 = 6;
+  optional bool field10479 = 7;
+  optional int32 field10480 = 8;
+  optional float field10481 = 9;
+}
+
+message Message10818 {
+  optional .benchmarks.google_message3.Message10800 field10819 = 1;
+  optional .benchmarks.google_message3.Message10801 field10820 = 2;
+}
+
+message Message10773 {
+  optional bool field10774 = 9;
+  optional bool field10775 = 1;
+  optional bool field10776 = 23;
+  optional bool field10777 = 2;
+  optional bool field10778 = 3;
+  optional int32 field10779 = 4;
+  optional int32 field10780 = 5;
+  optional int32 field10781 = 6;
+  optional int32 field10782 = 7;
+  optional int32 field10783 = 8;
+  optional int32 field10784 = 10;
+  optional .benchmarks.google_message3.Message10749 field10785 = 11;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field10786 = 12;
+  optional bool field10787 = 13;
+  optional bool field10788 = 15;
+  optional bool field10789 = 16;
+  optional int32 field10790 = 17;
+  optional int32 field10791 = 18;
+  optional bool field10792 = 19;
+  optional bool field10793 = 20;
+  optional bool field10794 = 21;
+  optional .benchmarks.google_message3.UnusedEnum field10795 = 14;
+  optional .benchmarks.google_message3.UnusedEnum field10796 = 22;
+}
+
+message Message13145 {
+  required .benchmarks.google_message3.Enum13146 field13155 = 1;
+  optional float field13156 = 2;
+  optional float field13157 = 3;
+  extensions 1000 to 536870911;
+}
+
+message Message16686 {
+}
+
+message Message12796 {
+  repeated fixed64 field12800 = 1;
+  optional uint64 field12801 = 2;
+}
+
+message Message6722 {
+}
+
+message Message6727 {
+}
+
+message Message6724 {
+}
+
+message Message6735 {
+}
+
+message Message8183 {
+  optional string field8226 = 1;
+  optional string field8227 = 2;
+}
+
+message Message8301 {
+  optional string field8328 = 1;
+  optional .benchmarks.google_message3.Message7966 field8329 = 2;
+  optional string field8330 = 3;
+  optional string field8331 = 4;
+  repeated .benchmarks.google_message3.Message8290 field8332 = 5;
+  optional .benchmarks.google_message3.Message7966 field8333 = 6;
+  repeated .benchmarks.google_message3.Message8298 field8334 = 7;
+  optional .benchmarks.google_message3.Message8300 field8335 = 8;
+  optional int64 field8336 = 9;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8337 = 10;
+  optional .benchmarks.google_message3.Message7965 field8338 = 11;
+  extensions 64 to 536870911;
+}
+
+message Message8456 {
+}
+
+message Message8302 {
+  optional string field8339 = 1;
+  optional .benchmarks.google_message3.Message7966 field8340 = 2;
+  optional string field8341 = 3;
+  optional string field8342 = 4;
+  optional string field8343 = 5;
+  optional string field8344 = 6;
+  optional string field8345 = 7;
+  optional int64 field8346 = 8;
+  optional int64 field8347 = 9;
+  repeated .benchmarks.google_message3.Message8290 field8348 = 10;
+  optional string field8349 = 11;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8350 = 12;
+  optional .benchmarks.google_message3.Message8291 field8351 = 13;
+  optional int64 field8352 = 14;
+  optional .benchmarks.google_message3.Message8296 field8353 = 15;
+  optional string field8354 = 16;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field8355 = 17;
+  repeated int32 field8356 = 18;
+  repeated int32 field8357 = 19;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field8358 = 20;
+  optional .benchmarks.google_message3.Message7965 field8359 = 21;
+  extensions 64 to 536870911;
+}
+
+message Message8457 {
+}
+
+message Message8449 {
+  optional string field8458 = 1;
+  optional bool field8459 = 2;
+  optional .benchmarks.google_message3.Enum8450 field8460 = 3;
+  repeated string field8461 = 4;
+  optional string field8462 = 5;
+  optional string field8463 = 6;
+  optional .benchmarks.google_message3.Message7966 field8464 = 7;
+}
+
+message Message13358 {
+  required fixed64 field13359 = 1;
+  required fixed64 field13360 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field13361 = 3;
+}
+
+message Message13912 {
+  required fixed32 field13913 = 1;
+  required fixed32 field13914 = 2;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field13915 = 500;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field13916 = 15;
+}
+
+message Message24316 {
+  repeated string field24443 = 1;
+  repeated string field24444 = 2;
+  repeated string field24445 = 3;
+}
+
+message Message24312 {
+  optional string field24421 = 1;
+  optional string field24422 = 2;
+  repeated string field24423 = 3;
+  repeated string field24424 = 4;
+  repeated string field24425 = 5;
+  repeated string field24426 = 6;
+}
+
+message Message24313 {
+  optional string field24427 = 1;
+  optional string field24428 = 2;
+  repeated string field24429 = 3;
+  optional string field24430 = 4;
+  optional string field24431 = 5;
+  optional string field24432 = 6;
+  optional string field24433 = 7;
+  repeated string field24434 = 8;
+  optional string field24435 = 9;
+  repeated string field24436 = 10;
+}
+
+message Message24315 {
+  required string field24440 = 1;
+  repeated string field24441 = 2;
+  repeated string field24442 = 3;
+}
+
+message Message716 {
+  required string field872 = 1;
+  required int32 field873 = 2;
+  optional bool field874 = 3;
+  optional .benchmarks.google_message3.Message717 field875 = 4;
+}
+
+message Message718 {
+  repeated string field878 = 1;
+  repeated string field879 = 2;
+  optional string field880 = 3;
+}
+
+message Message703 {
+  required string field795 = 1;
+  repeated string field796 = 2;
+  repeated string field797 = 3;
+  optional string field798 = 4;
+  repeated string field799 = 5;
+}
+
+message Message715 {
+  required string field859 = 1;
+  optional string field860 = 7;
+  repeated .benchmarks.google_message3.Message707 field861 = 2;
+  repeated .benchmarks.google_message3.Message708 field862 = 3;
+  repeated .benchmarks.google_message3.Message711 field863 = 4;
+  repeated .benchmarks.google_message3.Message712 field864 = 5;
+  repeated .benchmarks.google_message3.Message713 field865 = 6;
+  repeated .benchmarks.google_message3.Message714 field866 = 8;
+  repeated .benchmarks.google_message3.Message710 field867 = 9;
+  repeated .benchmarks.google_message3.Message709 field868 = 10;
+  repeated .benchmarks.google_message3.Message705 field869 = 11;
+  repeated .benchmarks.google_message3.Message702 field870 = 12;
+  repeated .benchmarks.google_message3.Message706 field871 = 13;
+}
+
+message Message700 {
+  repeated string field789 = 1;
+  repeated string field790 = 2;
+}
+
+message Message699 {
+  required string field787 = 1;
+  repeated string field788 = 2;
+}
+
+message Message698 {
+  optional string field779 = 1;
+  optional string field780 = 2;
+  optional string field781 = 3;
+  optional string field782 = 4;
+  optional uint64 field783 = 5;
+  optional uint32 field784 = 6;
+  optional int64 field785 = 7;
+  repeated string field786 = 8;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_6.proto b/benchmarks/datasets/google_message3/benchmark_message3_6.proto
new file mode 100644
index 00000000..98e1529e
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_6.proto
@@ -0,0 +1,454 @@
+syntax = "proto2";
+
+import "datasets/google_message3/benchmark_message3_7.proto";
+import "datasets/google_message3/benchmark_message3_8.proto";
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message10576 {
+}
+
+message Message10154 {
+  optional bytes field10192 = 1;
+  optional int32 field10193 = 2;
+}
+
+message Message8944 {
+  optional string field9045 = 2;
+  optional string field9046 = 3;
+  optional string field9047 = 23;
+  optional string field9048 = 52;
+  optional int32 field9049 = 53;
+  optional int32 field9050 = 54;
+  optional float field9051 = 55;
+  optional float field9052 = 56;
+  optional string field9053 = 57;
+  optional int64 field9054 = 1;
+  optional bool field9055 = 4;
+  optional int32 field9056 = 5;
+  optional int32 field9057 = 6;
+  optional int32 field9058 = 7;
+  optional float field9059 = 8;
+  optional float field9060 = 11;
+  optional float field9061 = 9;
+  optional float field9062 = 10;
+  optional float field9063 = 13;
+  optional bool field9064 = 14;
+  optional float field9065 = 70;
+  optional int32 field9066 = 71;
+  optional .benchmarks.google_message3.Enum8945 field9067 = 15;
+  optional int32 field9068 = 16;
+  optional int32 field9069 = 17;
+  optional float field9070 = 18;
+  optional float field9071 = 19;
+  optional int32 field9072 = 28;
+  optional int32 field9073 = 29;
+  optional float field9074 = 60;
+  optional float field9075 = 61;
+  optional int32 field9076 = 72;
+  optional int32 field9077 = 73;
+  optional .benchmarks.google_message3.Enum8951 field9078 = 62;
+  optional string field9079 = 20;
+  optional string field9080 = 21;
+  optional string field9081 = 22;
+  optional double field9082 = 31;
+  optional double field9083 = 32;
+  optional double field9084 = 33;
+  optional double field9085 = 36;
+  optional .benchmarks.google_message3.UnusedEnum field9086 = 37;
+  optional double field9087 = 38;
+  optional double field9088 = 39;
+  optional double field9089 = 63;
+  optional double field9090 = 64;
+  optional double field9091 = 65;
+  optional double field9092 = 34;
+  optional .benchmarks.google_message3.UnusedEnum field9093 = 35;
+  optional .benchmarks.google_message3.UnusedEnum field9094 = 66;
+  optional string field9095 = 40;
+  optional string field9096 = 41;
+  optional string field9097 = 42;
+  optional string field9098 = 43;
+  optional string field9099 = 44;
+  optional string field9100 = 45;
+  optional string field9101 = 46;
+  optional string field9102 = 47;
+  optional string field9103 = 48;
+  optional string field9104 = 49;
+  optional .benchmarks.google_message3.Message8939 field9105 = 100;
+  optional int64 field9106 = 101;
+}
+
+message Message9182 {
+  optional string field9205 = 1;
+  optional string field9206 = 2;
+  optional float field9207 = 16;
+  optional int32 field9208 = 17;
+  optional int32 field9209 = 27;
+  optional int32 field9210 = 7;
+  optional int32 field9211 = 8;
+  optional float field9212 = 26;
+  optional float field9213 = 22;
+  optional bool field9214 = 28;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field9215 = 21;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field9216 = 25;
+  repeated .benchmarks.google_message3.Message9181 field9217 = 29;
+  optional bool field9218 = 18;
+  optional bool field9219 = 19;
+  optional bool field9220 = 20;
+  optional .benchmarks.google_message3.Message9164 field9221 = 30;
+  optional .benchmarks.google_message3.Message9165 field9222 = 31;
+  optional .benchmarks.google_message3.Message9166 field9223 = 32;
+  optional float field9224 = 33;
+  optional .benchmarks.google_message3.Message9151 field9225 = 34;
+  optional float field9226 = 35;
+  optional float field9227 = 36;
+  optional float field9228 = 37;
+  optional float field9229 = 38;
+  optional float field9230 = 39;
+  extensions 3 to 6;
+  extensions 9 to 15;
+  extensions 23 to 23;
+  extensions 24 to 24;
+  extensions 1000 to 536870911;
+}
+
+message Message9160 {
+  optional int32 field9161 = 1;
+  optional bytes field9162 = 2;
+}
+
+message Message9242 {
+  repeated .benchmarks.google_message3.Enum9243 field9327 = 1;
+}
+
+message Message8890 {
+  repeated .benchmarks.google_message3.Message8888 field8916 = 1;
+}
+
+message Message9123 {
+  optional float field9135 = 1;
+}
+
+message Message9628 {
+  optional .benchmarks.google_message3.Message9627 field9673 = 1;
+  optional string field9674 = 2;
+  repeated int32 field9675 = 3;
+  optional int32 field9676 = 4;
+}
+
+message Message11014 {
+  optional int32 field11780 = 40;
+  optional string field11781 = 46;
+  optional bool field11782 = 47;
+  optional .benchmarks.google_message3.Enum11107 field11783 = 1;
+  optional int32 field11784 = 2;
+  optional double field11785 = 4;
+  optional int32 field11786 = 5;
+  optional int32 field11787 = 6;
+  optional double field11788 = 7;
+  optional double field11789 = 8;
+  optional int64 field11790 = 9;
+  optional bool field11791 = 10;
+  optional int64 field11792 = 28;
+  optional bool field11793 = 37;
+  optional .benchmarks.google_message3.Enum11541 field11794 = 44;
+  optional double field11795 = 49;
+  optional double field11796 = 51;
+  optional int64 field11797 = 54;
+  optional int64 field11798 = 55;
+  optional .benchmarks.google_message3.UnusedEnum field11799 = 57;
+  optional .benchmarks.google_message3.Enum11468 field11800 = 58;
+  optional int32 field11801 = 59;
+  optional .benchmarks.google_message3.UnusedEnum field11802 = 60;
+  optional int32 field11803 = 61;
+  optional int32 field11804 = 62;
+  optional int32 field11805 = 69;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field11806 = 68;
+  repeated .benchmarks.google_message3.Message11018 field11807 = 71;
+  optional bool field11808 = 50;
+  optional bool field11809 = 56;
+  optional bool field11810 = 66;
+  optional bool field11811 = 63;
+  optional bool field11812 = 64;
+  optional bool field11813 = 65;
+  optional bool field11814 = 67;
+  optional .benchmarks.google_message3.Enum11107 field11815 = 15;
+  optional int64 field11816 = 16;
+  optional double field11817 = 17;
+  optional int64 field11818 = 18;
+  optional int32 field11819 = 19;
+  optional int64 field11820 = 20;
+  optional int32 field11821 = 42;
+  optional int64 field11822 = 52;
+  optional int64 field11823 = 53;
+  optional int64 field11824 = 41;
+  optional double field11825 = 48;
+  repeated .benchmarks.google_message3.Message11020 field11826 = 70;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field11827 = 72;
+  optional double field11828 = 25;
+  optional string field11829 = 26;
+  optional int64 field11830 = 27;
+  optional int64 field11831 = 32;
+  optional uint64 field11832 = 33;
+  optional bool field11833 = 29;
+  optional bool field11834 = 34;
+  optional string field11835 = 30;
+  optional int32 field11836 = 3;
+  optional int32 field11837 = 31;
+  optional int32 field11838 = 73;
+  optional int32 field11839 = 35;
+  optional .benchmarks.google_message3.Enum11022 field11840 = 36;
+  optional .benchmarks.google_message3.Message11013 field11841 = 38;
+  optional double field11842 = 39;
+  optional int32 field11843 = 45;
+  optional bool field11844 = 74;
+}
+
+message Message10801 {
+  optional .benchmarks.google_message3.Message10800 field10812 = 1;
+  repeated .benchmarks.google_message3.Message10802 field10813 = 2;
+  optional int32 field10814 = 3;
+}
+
+message Message10749 {
+  repeated .benchmarks.google_message3.Message10748 field10754 = 1;
+}
+
+message Message8298 {
+  optional .benchmarks.google_message3.Message7966 field8321 = 1;
+  optional int64 field8322 = 2;
+  optional string field8323 = 3;
+}
+
+message Message8300 {
+  optional string field8326 = 1;
+  optional .benchmarks.google_message3.Message7966 field8327 = 2;
+}
+
+message Message8291 {
+  optional string field8306 = 1;
+  optional int32 field8307 = 2;
+  optional string field8308 = 3;
+  optional string field8309 = 4;
+  optional .benchmarks.google_message3.Enum8292 field8310 = 5;
+}
+
+message Message8296 {
+  optional .benchmarks.google_message3.Message7966 field8311 = 1;
+  optional string field8312 = 2;
+  optional .benchmarks.google_message3.Message7966 field8313 = 3;
+  optional int32 field8314 = 4;
+  optional int32 field8315 = 5;
+  optional string field8316 = 6;
+}
+
+message Message7965 {
+  optional int32 field7967 = 1;
+  optional int32 field7968 = 2;
+}
+
+message Message8290 {
+  optional string field8304 = 1;
+  optional string field8305 = 2;
+}
+
+message Message717 {
+  repeated string field876 = 1;
+  optional double field877 = 2;
+}
+
+message Message713 {
+  required .benchmarks.google_message3.Message708 field852 = 1;
+  repeated string field853 = 2;
+}
+
+message Message705 {
+  required string field807 = 1;
+  optional string field808 = 2;
+  optional string field809 = 3;
+  optional bool field810 = 4;
+  optional string field811 = 5;
+  optional string field812 = 6;
+  repeated string field813 = 7;
+}
+
+message Message709 {
+  repeated string field829 = 1;
+  repeated string field830 = 2;
+  repeated string field831 = 3;
+  repeated string field832 = 4;
+  repeated string field833 = 5;
+}
+
+message Message702 {
+  optional string field793 = 1;
+  optional string field794 = 2;
+}
+
+message Message714 {
+  optional string field854 = 1;
+  optional string field855 = 2;
+  optional string field856 = 3;
+  optional string field857 = 4;
+  optional uint32 field858 = 5;
+}
+
+message Message710 {
+  repeated string field834 = 1;
+  optional string field835 = 2;
+  optional string field836 = 3;
+  repeated string field837 = 4;
+  repeated string field838 = 5;
+}
+
+message Message706 {
+  repeated string field814 = 1;
+  optional string field815 = 2;
+  repeated string field816 = 3;
+  repeated string field817 = 4;
+}
+
+message Message707 {
+  required string field818 = 1;
+  required string field819 = 2;
+  required string field820 = 3;
+  optional bool field821 = 4;
+  repeated string field822 = 5;
+}
+
+message Message711 {
+  optional .benchmarks.google_message3.UnusedEmptyMessage field839 = 1;
+  repeated string field840 = 4;
+  repeated string field841 = 2;
+  repeated string field842 = 3;
+}
+
+message Message712 {
+  repeated string field843 = 1;
+  required string field844 = 2;
+  optional string field845 = 3;
+  repeated string field846 = 4;
+  repeated string field847 = 5;
+  optional string field848 = 6;
+  repeated string field849 = 7;
+  optional string field850 = 8;
+  optional string field851 = 9;
+}
+
+message Message8939 {
+  optional string field9010 = 1;
+  optional string field9011 = 2;
+  optional string field9012 = 3;
+  repeated string field9013 = 4;
+  optional string field9014 = 5;
+  repeated group Message8940 = 11 {
+  }
+  optional int64 field9016 = 21;
+  optional int64 field9017 = 22;
+  optional int64 field9018 = 23;
+  optional group Message8941 = 31 {
+    optional string field9033 = 32;
+    optional string field9034 = 33;
+    optional string field9035 = 34;
+    optional string field9036 = 35;
+    optional string field9037 = 36;
+    optional string field9038 = 37;
+  }
+  optional .benchmarks.google_message3.Message8942 field9020 = 38;
+  repeated .benchmarks.google_message3.UnusedEmptyMessage field9021 = 39;
+  repeated string field9022 = 41;
+  optional string field9023 = 42;
+  optional string field9024 = 43;
+  optional string field9025 = 44;
+  optional string field9026 = 45;
+  optional string field9027 = 46;
+  optional string field9028 = 47;
+  optional .benchmarks.google_message3.UnusedEnum field9029 = 48;
+  optional .benchmarks.google_message3.UnusedEnum field9030 = 49;
+  optional group Message8943 = 51 {
+    optional string field9039 = 1;
+    optional string field9040 = 2;
+    optional string field9041 = 3;
+    optional string field9042 = 4;
+    optional string field9043 = 5;
+    optional string field9044 = 6;
+  }
+}
+
+message Message9181 {
+  optional string field9204 = 1;
+}
+
+message Message9164 {
+  optional int32 field9168 = 1;
+  optional int32 field9169 = 2;
+  optional int32 field9170 = 3;
+}
+
+message Message9165 {
+  optional float field9171 = 1;
+  optional float field9172 = 2;
+}
+
+message Message9166 {
+  optional float field9173 = 1;
+  optional int32 field9174 = 2;
+}
+
+message Message9151 {
+  optional double field9152 = 1;
+  optional double field9153 = 2;
+  optional float field9154 = 3;
+  optional float field9155 = 4;
+  optional float field9156 = 5;
+  optional float field9157 = 6;
+  optional float field9158 = 7;
+  optional float field9159 = 8;
+}
+
+message Message8888 {
+  optional int32 field8908 = 1;
+  optional .benchmarks.google_message3.Enum8900 field8909 = 4;
+  repeated int32 field8910 = 2 [packed = true];
+  optional bytes field8911 = 3;
+}
+
+message Message9627 {
+  required int32 field9668 = 1;
+  required int32 field9669 = 2;
+  required int32 field9670 = 3;
+  required int32 field9671 = 4;
+  optional float field9672 = 5;
+}
+
+message Message11020 {
+}
+
+message Message11013 {
+  optional bytes field11757 = 19;
+  optional bytes field11758 = 1;
+  optional bytes field11759 = 2;
+  optional bytes field11760 = 3;
+  optional bytes field11761 = 4;
+  optional bytes field11762 = 5;
+  optional bytes field11763 = 6;
+  optional bytes field11764 = 7;
+  optional bytes field11765 = 8;
+  optional bytes field11766 = 9;
+  optional bytes field11767 = 10;
+  optional bytes field11768 = 11;
+  optional bytes field11769 = 12;
+  optional bytes field11770 = 13;
+  optional bytes field11771 = 14;
+  optional bytes field11772 = 15;
+  optional bytes field11773 = 16;
+  optional bytes field11774 = 17;
+  optional bytes field11775 = 18;
+  optional bytes field11776 = 20;
+  optional bytes field11777 = 21;
+  optional .benchmarks.google_message3.UnusedEmptyMessage field11778 = 23;
+  repeated .benchmarks.google_message3.Message11011 field11779 = 22;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_7.proto b/benchmarks/datasets/google_message3/benchmark_message3_7.proto
new file mode 100644
index 00000000..2497db5e
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_7.proto
@@ -0,0 +1,56 @@
+syntax = "proto2";
+
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message11018 {
+}
+
+message Message10800 {
+  optional string field10808 = 1;
+  optional int64 field10809 = 2;
+  optional bool field10810 = 3;
+  optional float field10811 = 4;
+}
+
+message Message10802 {
+}
+
+message Message10748 {
+  optional string field10750 = 1;
+  optional int32 field10751 = 2;
+  optional int32 field10752 = 3;
+  optional int32 field10753 = 4;
+}
+
+message Message7966 {
+  optional string field7969 = 1;
+  optional bool field7970 = 2;
+}
+
+message Message708 {
+  optional .benchmarks.google_message3.Message741 field823 = 1;
+  repeated string field824 = 6;
+  optional string field825 = 2;
+  optional string field826 = 3;
+  repeated string field827 = 4;
+  repeated string field828 = 5;
+}
+
+message Message8942 {
+}
+
+message Message11011 {
+  required bytes field11752 = 1;
+  required bytes field11753 = 2;
+}
+
+message UnusedEmptyMessage {
+}
+
+message Message741 {
+  repeated string field936 = 1;
+}
+
diff --git a/benchmarks/datasets/google_message3/benchmark_message3_8.proto b/benchmarks/datasets/google_message3/benchmark_message3_8.proto
new file mode 100644
index 00000000..1d2b1472
--- /dev/null
+++ b/benchmarks/datasets/google_message3/benchmark_message3_8.proto
@@ -0,0 +1,1900 @@
+syntax = "proto2";
+
+package benchmarks.google_message3;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+enum Enum720 {
+  ENUM_VALUE721 = 1;
+  ENUM_VALUE722 = 2;
+}
+
+enum Enum3476 {
+  ENUM_VALUE3477 = 0;
+  ENUM_VALUE3478 = 1;
+  ENUM_VALUE3479 = 2;
+  ENUM_VALUE3480 = 3;
+  ENUM_VALUE3481 = 4;
+  ENUM_VALUE3482 = 5;
+  ENUM_VALUE3483 = 6;
+  ENUM_VALUE3484 = 7;
+  ENUM_VALUE3485 = 8;
+  ENUM_VALUE3486 = 9;
+  ENUM_VALUE3487 = 10;
+  ENUM_VALUE3488 = 11;
+  ENUM_VALUE3489 = 12;
+  ENUM_VALUE3490 = 13;
+  ENUM_VALUE3491 = 14;
+  ENUM_VALUE3492 = 15;
+  ENUM_VALUE3493 = 16;
+  ENUM_VALUE3494 = 17;
+  ENUM_VALUE3495 = 18;
+  ENUM_VALUE3496 = 19;
+  ENUM_VALUE3497 = 20;
+  ENUM_VALUE3498 = 21;
+  ENUM_VALUE3499 = 22;
+  ENUM_VALUE3500 = 23;
+  ENUM_VALUE3501 = 24;
+  ENUM_VALUE3502 = 25;
+  ENUM_VALUE3503 = 26;
+  ENUM_VALUE3504 = 27;
+  ENUM_VALUE3505 = 28;
+  ENUM_VALUE3506 = 29;
+  ENUM_VALUE3507 = 30;
+  ENUM_VALUE3508 = 31;
+  ENUM_VALUE3509 = 32;
+  ENUM_VALUE3510 = 33;
+  ENUM_VALUE3511 = 34;
+  ENUM_VALUE3512 = 35;
+  ENUM_VALUE3513 = 36;
+  ENUM_VALUE3514 = 37;
+  ENUM_VALUE3515 = 38;
+  ENUM_VALUE3516 = 39;
+  ENUM_VALUE3517 = 40;
+  ENUM_VALUE3518 = 41;
+  ENUM_VALUE3519 = 42;
+  ENUM_VALUE3520 = 43;
+  ENUM_VALUE3521 = 44;
+  ENUM_VALUE3522 = 45;
+  ENUM_VALUE3523 = 46;
+  ENUM_VALUE3524 = 47;
+  ENUM_VALUE3525 = 48;
+  ENUM_VALUE3526 = 49;
+  ENUM_VALUE3527 = 50;
+  ENUM_VALUE3528 = 51;
+  ENUM_VALUE3529 = 52;
+  ENUM_VALUE3530 = 53;
+  ENUM_VALUE3531 = 54;
+  ENUM_VALUE3532 = 55;
+  ENUM_VALUE3533 = 56;
+  ENUM_VALUE3534 = 57;
+  ENUM_VALUE3535 = 58;
+  ENUM_VALUE3536 = 59;
+  ENUM_VALUE3537 = 60;
+  ENUM_VALUE3538 = 61;
+  ENUM_VALUE3539 = 62;
+  ENUM_VALUE3540 = 63;
+  ENUM_VALUE3541 = 64;
+  ENUM_VALUE3542 = 65;
+  ENUM_VALUE3543 = 66;
+  ENUM_VALUE3544 = 67;
+  ENUM_VALUE3545 = 68;
+  ENUM_VALUE3546 = 69;
+  ENUM_VALUE3547 = 70;
+  ENUM_VALUE3548 = 71;
+  ENUM_VALUE3549 = 72;
+  ENUM_VALUE3550 = 73;
+  ENUM_VALUE3551 = 74;
+  ENUM_VALUE3552 = 75;
+  ENUM_VALUE3553 = 76;
+  ENUM_VALUE3554 = 77;
+  ENUM_VALUE3555 = 78;
+  ENUM_VALUE3556 = 79;
+  ENUM_VALUE3557 = 80;
+  ENUM_VALUE3558 = 81;
+  ENUM_VALUE3559 = 82;
+  ENUM_VALUE3560 = 83;
+  ENUM_VALUE3561 = 84;
+  ENUM_VALUE3562 = 85;
+  ENUM_VALUE3563 = 86;
+  ENUM_VALUE3564 = 87;
+  ENUM_VALUE3565 = 88;
+  ENUM_VALUE3566 = 89;
+  ENUM_VALUE3567 = 90;
+  ENUM_VALUE3568 = 91;
+  ENUM_VALUE3569 = 92;
+  ENUM_VALUE3570 = 93;
+  ENUM_VALUE3571 = 94;
+  ENUM_VALUE3572 = 95;
+  ENUM_VALUE3573 = 96;
+  ENUM_VALUE3574 = 97;
+  ENUM_VALUE3575 = 98;
+  ENUM_VALUE3576 = 99;
+  ENUM_VALUE3577 = 100;
+  ENUM_VALUE3578 = 101;
+  ENUM_VALUE3579 = 102;
+  ENUM_VALUE3580 = 103;
+  ENUM_VALUE3581 = 104;
+  ENUM_VALUE3582 = 105;
+  ENUM_VALUE3583 = 106;
+  ENUM_VALUE3584 = 107;
+  ENUM_VALUE3585 = 108;
+  ENUM_VALUE3586 = 109;
+  ENUM_VALUE3587 = 110;
+  ENUM_VALUE3588 = 111;
+  ENUM_VALUE3589 = 112;
+  ENUM_VALUE3590 = 113;
+  ENUM_VALUE3591 = 114;
+  ENUM_VALUE3592 = 115;
+  ENUM_VALUE3593 = 116;
+  ENUM_VALUE3594 = 117;
+  ENUM_VALUE3595 = 118;
+  ENUM_VALUE3596 = 119;
+  ENUM_VALUE3597 = 120;
+  ENUM_VALUE3598 = 121;
+  ENUM_VALUE3599 = 122;
+  ENUM_VALUE3600 = 123;
+  ENUM_VALUE3601 = 124;
+  ENUM_VALUE3602 = 125;
+  ENUM_VALUE3603 = 126;
+  ENUM_VALUE3604 = 127;
+  ENUM_VALUE3605 = 128;
+  ENUM_VALUE3606 = 129;
+  ENUM_VALUE3607 = 130;
+  ENUM_VALUE3608 = 131;
+  ENUM_VALUE3609 = 132;
+  ENUM_VALUE3610 = 133;
+  ENUM_VALUE3611 = 134;
+  ENUM_VALUE3612 = 135;
+  ENUM_VALUE3613 = 136;
+  ENUM_VALUE3614 = 137;
+  ENUM_VALUE3615 = 138;
+  ENUM_VALUE3616 = 139;
+  ENUM_VALUE3617 = 140;
+  ENUM_VALUE3618 = 141;
+  ENUM_VALUE3619 = 142;
+  ENUM_VALUE3620 = 143;
+  ENUM_VALUE3621 = 144;
+  ENUM_VALUE3622 = 145;
+  ENUM_VALUE3623 = 146;
+  ENUM_VALUE3624 = 147;
+  ENUM_VALUE3625 = 148;
+  ENUM_VALUE3626 = 149;
+  ENUM_VALUE3627 = 150;
+  ENUM_VALUE3628 = 151;
+  ENUM_VALUE3629 = 152;
+  ENUM_VALUE3630 = 153;
+  ENUM_VALUE3631 = 154;
+  ENUM_VALUE3632 = 155;
+  ENUM_VALUE3633 = 156;
+  ENUM_VALUE3634 = 157;
+  ENUM_VALUE3635 = 158;
+  ENUM_VALUE3636 = 159;
+  ENUM_VALUE3637 = 160;
+  ENUM_VALUE3638 = 161;
+  ENUM_VALUE3639 = 162;
+  ENUM_VALUE3640 = 163;
+  ENUM_VALUE3641 = 164;
+  ENUM_VALUE3642 = 165;
+  ENUM_VALUE3643 = 166;
+  ENUM_VALUE3644 = 167;
+  ENUM_VALUE3645 = 168;
+  ENUM_VALUE3646 = 169;
+  ENUM_VALUE3647 = 170;
+  ENUM_VALUE3648 = 171;
+  ENUM_VALUE3649 = 172;
+  ENUM_VALUE3650 = 173;
+  ENUM_VALUE3651 = 174;
+  ENUM_VALUE3652 = 175;
+  ENUM_VALUE3653 = 176;
+  ENUM_VALUE3654 = 177;
+  ENUM_VALUE3655 = 178;
+  ENUM_VALUE3656 = 179;
+  ENUM_VALUE3657 = 180;
+  ENUM_VALUE3658 = 181;
+  ENUM_VALUE3659 = 182;
+  ENUM_VALUE3660 = 183;
+}
+
+enum Enum3805 {
+  ENUM_VALUE3806 = 0;
+  ENUM_VALUE3807 = 1;
+  ENUM_VALUE3808 = 2;
+  ENUM_VALUE3809 = 3;
+  ENUM_VALUE3810 = 4;
+  ENUM_VALUE3811 = 5;
+  ENUM_VALUE3812 = 6;
+  ENUM_VALUE3813 = 7;
+  ENUM_VALUE3814 = 8;
+  ENUM_VALUE3815 = 9;
+  ENUM_VALUE3816 = 11;
+  ENUM_VALUE3817 = 10;
+}
+
+enum Enum3783 {
+  ENUM_VALUE3784 = 0;
+  ENUM_VALUE3785 = 1;
+  ENUM_VALUE3786 = 2;
+  ENUM_VALUE3787 = 3;
+  ENUM_VALUE3788 = 4;
+  ENUM_VALUE3789 = 5;
+  ENUM_VALUE3790 = 6;
+  ENUM_VALUE3791 = 7;
+  ENUM_VALUE3792 = 8;
+  ENUM_VALUE3793 = 9;
+  ENUM_VALUE3794 = 10;
+  ENUM_VALUE3795 = 11;
+  ENUM_VALUE3796 = 12;
+  ENUM_VALUE3797 = 13;
+  ENUM_VALUE3798 = 14;
+  ENUM_VALUE3799 = 15;
+  ENUM_VALUE3800 = 16;
+  ENUM_VALUE3801 = 20;
+  ENUM_VALUE3802 = 21;
+  ENUM_VALUE3803 = 50;
+}
+
+enum Enum3851 {
+  ENUM_VALUE3852 = 0;
+  ENUM_VALUE3853 = 1;
+  ENUM_VALUE3854 = 2;
+  ENUM_VALUE3855 = 3;
+  ENUM_VALUE3856 = 4;
+  ENUM_VALUE3857 = 5;
+  ENUM_VALUE3858 = 6;
+  ENUM_VALUE3859 = 7;
+  ENUM_VALUE3860 = 8;
+  ENUM_VALUE3861 = 9;
+  ENUM_VALUE3862 = 10;
+  ENUM_VALUE3863 = 11;
+  ENUM_VALUE3864 = 12;
+  ENUM_VALUE3865 = 13;
+  ENUM_VALUE3866 = 14;
+  ENUM_VALUE3867 = 15;
+  ENUM_VALUE3868 = 16;
+  ENUM_VALUE3869 = 17;
+}
+
+enum UnusedEnum {
+  UNUSED_ENUM_VALUE1 = 0;
+  UNUSED_ENUM_VALUE2 = 1;
+}
+
+enum Enum4146 {
+  ENUM_VALUE4147 = 0;
+  ENUM_VALUE4148 = 1;
+  ENUM_VALUE4149 = 2;
+  ENUM_VALUE4150 = 3;
+  ENUM_VALUE4151 = 4;
+}
+
+enum Enum4160 {
+  ENUM_VALUE4161 = 0;
+  ENUM_VALUE4162 = 1;
+}
+
+enum Enum4152 {
+  ENUM_VALUE4153 = 0;
+  ENUM_VALUE4154 = 1;
+  ENUM_VALUE4155 = 2;
+  ENUM_VALUE4156 = 3;
+  ENUM_VALUE4157 = 4;
+  ENUM_VALUE4158 = 5;
+  ENUM_VALUE4159 = 6;
+}
+
+enum Enum6025 {
+  ENUM_VALUE6026 = 0;
+  ENUM_VALUE6027 = 1;
+  ENUM_VALUE6028 = 2;
+  ENUM_VALUE6029 = 3;
+  ENUM_VALUE6030 = 4;
+  ENUM_VALUE6031 = 5;
+  ENUM_VALUE6032 = 6;
+  ENUM_VALUE6033 = 7;
+  ENUM_VALUE6034 = 8;
+  ENUM_VALUE6035 = 9;
+  ENUM_VALUE6036 = 10;
+  ENUM_VALUE6037 = 11;
+  ENUM_VALUE6038 = 12;
+  ENUM_VALUE6039 = 13;
+  ENUM_VALUE6040 = 14;
+  ENUM_VALUE6041 = 15;
+  ENUM_VALUE6042 = 16;
+  ENUM_VALUE6043 = 17;
+  ENUM_VALUE6044 = 18;
+  ENUM_VALUE6045 = 19;
+  ENUM_VALUE6046 = 20;
+  ENUM_VALUE6047 = 21;
+}
+
+enum Enum6065 {
+  ENUM_VALUE6066 = 0;
+  ENUM_VALUE6067 = 1;
+  ENUM_VALUE6068 = 2;
+  ENUM_VALUE6069 = 3;
+  ENUM_VALUE6070 = 4;
+  ENUM_VALUE6071 = 5;
+  ENUM_VALUE6072 = 6;
+  ENUM_VALUE6073 = 7;
+  ENUM_VALUE6074 = 8;
+  ENUM_VALUE6075 = 9;
+  ENUM_VALUE6076 = 10;
+  ENUM_VALUE6077 = 11;
+  ENUM_VALUE6078 = 12;
+  ENUM_VALUE6079 = 13;
+  ENUM_VALUE6080 = 14;
+}
+
+enum Enum6579 {
+  ENUM_VALUE6580 = 0;
+  ENUM_VALUE6581 = 2;
+  ENUM_VALUE6582 = 3;
+  ENUM_VALUE6583 = 5;
+  ENUM_VALUE6584 = 10;
+  ENUM_VALUE6585 = 15;
+  ENUM_VALUE6586 = 25;
+  ENUM_VALUE6587 = 30;
+}
+
+enum Enum6588 {
+  ENUM_VALUE6589 = 0;
+  ENUM_VALUE6590 = 1;
+  ENUM_VALUE6591 = 2;
+  ENUM_VALUE6592 = 3;
+  ENUM_VALUE6593 = 4;
+  ENUM_VALUE6594 = 5;
+  ENUM_VALUE6595 = 6;
+  ENUM_VALUE6596 = 7;
+  ENUM_VALUE6597 = 8;
+  ENUM_VALUE6598 = 9;
+  ENUM_VALUE6599 = 10;
+  ENUM_VALUE6600 = 11;
+  ENUM_VALUE6601 = 12;
+  ENUM_VALUE6602 = 13;
+  ENUM_VALUE6603 = 14;
+  ENUM_VALUE6604 = 15;
+  ENUM_VALUE6605 = 16;
+  ENUM_VALUE6606 = 17;
+  ENUM_VALUE6607 = 19;
+  ENUM_VALUE6608 = 20;
+  ENUM_VALUE6609 = 21;
+  ENUM_VALUE6610 = 22;
+  ENUM_VALUE6611 = 23;
+  ENUM_VALUE6612 = 24;
+  ENUM_VALUE6613 = 25;
+  ENUM_VALUE6614 = 26;
+  ENUM_VALUE6615 = 27;
+  ENUM_VALUE6616 = 28;
+  ENUM_VALUE6617 = 29;
+  ENUM_VALUE6618 = 30;
+  ENUM_VALUE6619 = 31;
+  ENUM_VALUE6620 = 32;
+  ENUM_VALUE6621 = 33;
+  ENUM_VALUE6622 = 34;
+}
+
+enum Enum6769 {
+  ENUM_VALUE6770 = 0;
+  ENUM_VALUE6771 = 1;
+  ENUM_VALUE6772 = 2;
+}
+
+enum Enum6774 {
+  ENUM_VALUE6775 = 0;
+  ENUM_VALUE6776 = 1;
+  ENUM_VALUE6777 = 2;
+  ENUM_VALUE6778 = 3;
+  ENUM_VALUE6779 = 4;
+  ENUM_VALUE6780 = 5;
+  ENUM_VALUE6781 = 6;
+}
+
+enum Enum6782 {
+  ENUM_VALUE6783 = 0;
+  ENUM_VALUE6784 = 1;
+  ENUM_VALUE6785 = 2;
+  ENUM_VALUE6786 = 3;
+  ENUM_VALUE6787 = 4;
+  ENUM_VALUE6788 = 5;
+}
+
+enum Enum6858 {
+  ENUM_VALUE6859 = 1;
+  ENUM_VALUE6860 = 2;
+  ENUM_VALUE6861 = 3;
+  ENUM_VALUE6862 = 4;
+}
+
+enum Enum6815 {
+  ENUM_VALUE6816 = 0;
+  ENUM_VALUE6817 = 1;
+  ENUM_VALUE6818 = 2;
+  ENUM_VALUE6819 = 3;
+  ENUM_VALUE6820 = 4;
+  ENUM_VALUE6821 = 5;
+}
+
+enum Enum6822 {
+  ENUM_VALUE6823 = 0;
+  ENUM_VALUE6824 = 1;
+  ENUM_VALUE6825 = 2;
+  ENUM_VALUE6826 = 3;
+}
+
+enum Enum7654 {
+  ENUM_VALUE7655 = 1;
+  ENUM_VALUE7656 = 2;
+  ENUM_VALUE7657 = 3;
+}
+
+enum Enum8292 {
+  ENUM_VALUE8293 = 0;
+  ENUM_VALUE8294 = 1;
+  ENUM_VALUE8295 = 2;
+}
+
+enum Enum8450 {
+  ENUM_VALUE8451 = 0;
+  ENUM_VALUE8452 = 1;
+  ENUM_VALUE8453 = 2;
+}
+
+enum Enum8900 {
+  ENUM_VALUE8901 = 0;
+  ENUM_VALUE8902 = 1;
+  ENUM_VALUE8903 = 2;
+  ENUM_VALUE8904 = 3;
+  ENUM_VALUE8905 = 4;
+}
+
+enum Enum8945 {
+  ENUM_VALUE8946 = 0;
+  ENUM_VALUE8947 = 1;
+  ENUM_VALUE8948 = 2;
+  ENUM_VALUE8949 = 3;
+  ENUM_VALUE8950 = 4;
+}
+
+enum Enum8951 {
+  ENUM_VALUE8952 = 1;
+  ENUM_VALUE8953 = 2;
+  ENUM_VALUE8954 = 3;
+  ENUM_VALUE8955 = 4;
+  ENUM_VALUE8956 = 5;
+  ENUM_VALUE8957 = 6;
+  ENUM_VALUE8958 = 7;
+  ENUM_VALUE8959 = 8;
+}
+
+enum Enum9243 {
+  ENUM_VALUE9244 = -1;
+  ENUM_VALUE9245 = 0;
+  ENUM_VALUE9246 = 1;
+  ENUM_VALUE9247 = 2;
+  ENUM_VALUE9248 = 3;
+  ENUM_VALUE9249 = 4;
+  ENUM_VALUE9250 = 5;
+  ENUM_VALUE9251 = 6;
+  ENUM_VALUE9252 = 7;
+  ENUM_VALUE9253 = 8;
+  ENUM_VALUE9254 = 9;
+  ENUM_VALUE9255 = 10;
+  ENUM_VALUE9256 = 11;
+  ENUM_VALUE9257 = 12;
+  ENUM_VALUE9258 = 13;
+  ENUM_VALUE9259 = 14;
+  ENUM_VALUE9260 = 15;
+  ENUM_VALUE9261 = 16;
+  ENUM_VALUE9262 = 17;
+  ENUM_VALUE9263 = 71;
+  ENUM_VALUE9264 = 72;
+  ENUM_VALUE9265 = 73;
+  ENUM_VALUE9266 = 74;
+  ENUM_VALUE9267 = 18;
+  ENUM_VALUE9268 = 20;
+  ENUM_VALUE9269 = 21;
+  ENUM_VALUE9270 = 22;
+  ENUM_VALUE9271 = 23;
+  ENUM_VALUE9272 = 61;
+  ENUM_VALUE9273 = 62;
+  ENUM_VALUE9274 = 63;
+  ENUM_VALUE9275 = 64;
+  ENUM_VALUE9276 = 66;
+  ENUM_VALUE9277 = 67;
+  ENUM_VALUE9278 = 24;
+  ENUM_VALUE9279 = 25;
+  ENUM_VALUE9280 = 26;
+  ENUM_VALUE9281 = 27;
+  ENUM_VALUE9282 = 28;
+  ENUM_VALUE9283 = 29;
+  ENUM_VALUE9284 = 30;
+  ENUM_VALUE9285 = 31;
+  ENUM_VALUE9286 = 32;
+  ENUM_VALUE9287 = 33;
+  ENUM_VALUE9288 = 34;
+  ENUM_VALUE9289 = 35;
+  ENUM_VALUE9290 = 36;
+  ENUM_VALUE9291 = 37;
+  ENUM_VALUE9292 = 38;
+  ENUM_VALUE9293 = 39;
+  ENUM_VALUE9294 = 40;
+  ENUM_VALUE9295 = 41;
+  ENUM_VALUE9296 = 42;
+  ENUM_VALUE9297 = 43;
+  ENUM_VALUE9298 = 44;
+  ENUM_VALUE9299 = 45;
+  ENUM_VALUE9300 = 46;
+  ENUM_VALUE9301 = 47;
+  ENUM_VALUE9302 = 48;
+  ENUM_VALUE9303 = 49;
+  ENUM_VALUE9304 = 50;
+  ENUM_VALUE9305 = 51;
+  ENUM_VALUE9306 = 52;
+  ENUM_VALUE9307 = 53;
+  ENUM_VALUE9308 = 54;
+  ENUM_VALUE9309 = 55;
+  ENUM_VALUE9310 = 56;
+  ENUM_VALUE9311 = 57;
+  ENUM_VALUE9312 = 58;
+  ENUM_VALUE9313 = 59;
+  ENUM_VALUE9314 = 60;
+  ENUM_VALUE9315 = 68;
+  ENUM_VALUE9316 = 69;
+  ENUM_VALUE9317 = 70;
+  ENUM_VALUE9318 = 1000;
+  ENUM_VALUE9319 = 1001;
+  ENUM_VALUE9320 = 1002;
+  ENUM_VALUE9321 = 1003;
+  ENUM_VALUE9322 = 1004;
+  ENUM_VALUE9323 = 1005;
+  ENUM_VALUE9324 = 1006;
+  ENUM_VALUE9325 = 1007;
+  ENUM_VALUE9326 = 65;
+}
+
+enum Enum10157 {
+  ENUM_VALUE10158 = 0;
+  ENUM_VALUE10159 = 1;
+  ENUM_VALUE10160 = 2;
+  ENUM_VALUE10161 = 3;
+  ENUM_VALUE10162 = 4;
+  ENUM_VALUE10163 = 5;
+  ENUM_VALUE10164 = 6;
+  ENUM_VALUE10165 = 7;
+  ENUM_VALUE10166 = 8;
+}
+
+enum Enum10167 {
+  ENUM_VALUE10168 = 0;
+  ENUM_VALUE10169 = 1;
+  ENUM_VALUE10170 = 2;
+  ENUM_VALUE10171 = 3;
+  ENUM_VALUE10172 = 4;
+  ENUM_VALUE10173 = 5;
+  ENUM_VALUE10174 = 6;
+  ENUM_VALUE10175 = 7;
+  ENUM_VALUE10176 = 8;
+}
+
+enum Enum8862 {
+  ENUM_VALUE8863 = 0;
+  ENUM_VALUE8864 = 1;
+  ENUM_VALUE8865 = 2;
+  ENUM_VALUE8866 = 3;
+  ENUM_VALUE8867 = 4;
+  ENUM_VALUE8868 = 5;
+  ENUM_VALUE8869 = 6;
+  ENUM_VALUE8870 = 7;
+  ENUM_VALUE8871 = 13;
+  ENUM_VALUE8872 = 14;
+  ENUM_VALUE8873 = 8;
+  ENUM_VALUE8874 = 9;
+  ENUM_VALUE8875 = 10;
+  ENUM_VALUE8876 = 11;
+  ENUM_VALUE8877 = 12;
+  ENUM_VALUE8878 = 15;
+}
+
+enum Enum10325 {
+  ENUM_VALUE10326 = 0;
+  ENUM_VALUE10327 = 1;
+  ENUM_VALUE10328 = 2;
+  ENUM_VALUE10329 = 3;
+  ENUM_VALUE10330 = 4;
+  ENUM_VALUE10331 = 5;
+  ENUM_VALUE10332 = 6;
+  ENUM_VALUE10333 = 7;
+  ENUM_VALUE10334 = 8;
+}
+
+enum Enum10335 {
+  ENUM_VALUE10336 = 0;
+}
+
+enum Enum10337 {
+  ENUM_VALUE10338 = 0;
+  ENUM_VALUE10339 = 1;
+}
+
+enum Enum10392 {
+  ENUM_VALUE10393 = 0;
+  ENUM_VALUE10394 = 1;
+  ENUM_VALUE10395 = 2;
+  ENUM_VALUE10396 = 3;
+  ENUM_VALUE10397 = 4;
+  ENUM_VALUE10398 = 5;
+  ENUM_VALUE10399 = 6;
+  ENUM_VALUE10400 = 7;
+  ENUM_VALUE10401 = 8;
+  ENUM_VALUE10402 = 15;
+  ENUM_VALUE10403 = 9;
+  ENUM_VALUE10404 = 10;
+  ENUM_VALUE10405 = 11;
+  ENUM_VALUE10406 = 12;
+  ENUM_VALUE10407 = 13;
+  ENUM_VALUE10408 = 14;
+  ENUM_VALUE10409 = 101;
+  ENUM_VALUE10410 = 102;
+}
+
+enum Enum11107 {
+  ENUM_VALUE11108 = 0;
+  ENUM_VALUE11109 = 1;
+  ENUM_VALUE11110 = 2;
+  ENUM_VALUE11111 = 3;
+  ENUM_VALUE11112 = 4;
+  ENUM_VALUE11113 = 5;
+  ENUM_VALUE11114 = 6;
+  ENUM_VALUE11115 = 7;
+  ENUM_VALUE11116 = 8;
+  ENUM_VALUE11117 = 9;
+  ENUM_VALUE11118 = 10;
+  ENUM_VALUE11119 = 11;
+  ENUM_VALUE11120 = 12;
+  ENUM_VALUE11121 = 13;
+  ENUM_VALUE11122 = 14;
+  ENUM_VALUE11123 = 15;
+  ENUM_VALUE11124 = 16;
+  ENUM_VALUE11125 = 17;
+  ENUM_VALUE11126 = 18;
+  ENUM_VALUE11127 = 19;
+  ENUM_VALUE11128 = 20;
+  ENUM_VALUE11129 = 21;
+  ENUM_VALUE11130 = 22;
+  ENUM_VALUE11131 = 23;
+  ENUM_VALUE11132 = 24;
+  ENUM_VALUE11133 = 25;
+  ENUM_VALUE11134 = 26;
+  ENUM_VALUE11135 = 27;
+  ENUM_VALUE11136 = 28;
+  ENUM_VALUE11137 = 29;
+  ENUM_VALUE11138 = 30;
+  ENUM_VALUE11139 = 31;
+  ENUM_VALUE11140 = 32;
+  ENUM_VALUE11141 = 33;
+  ENUM_VALUE11142 = 34;
+  ENUM_VALUE11143 = 35;
+  ENUM_VALUE11144 = 36;
+  ENUM_VALUE11145 = 37;
+  ENUM_VALUE11146 = 38;
+  ENUM_VALUE11147 = 39;
+  ENUM_VALUE11148 = 40;
+  ENUM_VALUE11149 = 41;
+  ENUM_VALUE11150 = 42;
+  ENUM_VALUE11151 = 43;
+  ENUM_VALUE11152 = 44;
+  ENUM_VALUE11153 = 45;
+  ENUM_VALUE11154 = 46;
+  ENUM_VALUE11155 = 47;
+  ENUM_VALUE11156 = 48;
+  ENUM_VALUE11157 = 49;
+  ENUM_VALUE11158 = 50;
+  ENUM_VALUE11159 = 51;
+  ENUM_VALUE11160 = 52;
+  ENUM_VALUE11161 = 53;
+  ENUM_VALUE11162 = 54;
+  ENUM_VALUE11163 = 55;
+  ENUM_VALUE11164 = 56;
+  ENUM_VALUE11165 = 57;
+  ENUM_VALUE11166 = 58;
+  ENUM_VALUE11167 = 59;
+  ENUM_VALUE11168 = 60;
+  ENUM_VALUE11169 = 61;
+  ENUM_VALUE11170 = 62;
+  ENUM_VALUE11171 = 63;
+  ENUM_VALUE11172 = 64;
+  ENUM_VALUE11173 = 65;
+  ENUM_VALUE11174 = 66;
+  ENUM_VALUE11175 = 67;
+  ENUM_VALUE11176 = 68;
+  ENUM_VALUE11177 = 69;
+  ENUM_VALUE11178 = 70;
+  ENUM_VALUE11179 = 71;
+  ENUM_VALUE11180 = 72;
+  ENUM_VALUE11181 = 73;
+  ENUM_VALUE11182 = 74;
+  ENUM_VALUE11183 = 75;
+  ENUM_VALUE11184 = 76;
+  ENUM_VALUE11185 = 77;
+  ENUM_VALUE11186 = 78;
+  ENUM_VALUE11187 = 79;
+  ENUM_VALUE11188 = 80;
+  ENUM_VALUE11189 = 81;
+  ENUM_VALUE11190 = 82;
+  ENUM_VALUE11191 = 83;
+  ENUM_VALUE11192 = 84;
+  ENUM_VALUE11193 = 85;
+  ENUM_VALUE11194 = 86;
+  ENUM_VALUE11195 = 87;
+  ENUM_VALUE11196 = 88;
+  ENUM_VALUE11197 = 89;
+  ENUM_VALUE11198 = 90;
+  ENUM_VALUE11199 = 91;
+  ENUM_VALUE11200 = 92;
+  ENUM_VALUE11201 = 93;
+  ENUM_VALUE11202 = 94;
+  ENUM_VALUE11203 = 95;
+  ENUM_VALUE11204 = 96;
+  ENUM_VALUE11205 = 97;
+  ENUM_VALUE11206 = 98;
+  ENUM_VALUE11207 = 99;
+  ENUM_VALUE11208 = 100;
+  ENUM_VALUE11209 = 101;
+  ENUM_VALUE11210 = 102;
+  ENUM_VALUE11211 = 103;
+  ENUM_VALUE11212 = 104;
+  ENUM_VALUE11213 = 105;
+  ENUM_VALUE11214 = 106;
+  ENUM_VALUE11215 = 107;
+  ENUM_VALUE11216 = 108;
+  ENUM_VALUE11217 = 109;
+  ENUM_VALUE11218 = 110;
+  ENUM_VALUE11219 = 111;
+  ENUM_VALUE11220 = 112;
+  ENUM_VALUE11221 = 113;
+  ENUM_VALUE11222 = 114;
+  ENUM_VALUE11223 = 115;
+  ENUM_VALUE11224 = 116;
+  ENUM_VALUE11225 = 117;
+  ENUM_VALUE11226 = 118;
+  ENUM_VALUE11227 = 119;
+  ENUM_VALUE11228 = 120;
+  ENUM_VALUE11229 = 121;
+  ENUM_VALUE11230 = 122;
+  ENUM_VALUE11231 = 123;
+  ENUM_VALUE11232 = 124;
+  ENUM_VALUE11233 = 125;
+  ENUM_VALUE11234 = 126;
+  ENUM_VALUE11235 = 127;
+  ENUM_VALUE11236 = 128;
+  ENUM_VALUE11237 = 129;
+  ENUM_VALUE11238 = 130;
+  ENUM_VALUE11239 = 131;
+  ENUM_VALUE11240 = 132;
+  ENUM_VALUE11241 = 133;
+  ENUM_VALUE11242 = 134;
+  ENUM_VALUE11243 = 135;
+  ENUM_VALUE11244 = 136;
+  ENUM_VALUE11245 = 137;
+  ENUM_VALUE11246 = 138;
+  ENUM_VALUE11247 = 139;
+  ENUM_VALUE11248 = 140;
+  ENUM_VALUE11249 = 141;
+  ENUM_VALUE11250 = 142;
+  ENUM_VALUE11251 = 143;
+  ENUM_VALUE11252 = 144;
+  ENUM_VALUE11253 = 145;
+  ENUM_VALUE11254 = 146;
+  ENUM_VALUE11255 = 147;
+  ENUM_VALUE11256 = 148;
+  ENUM_VALUE11257 = 149;
+  ENUM_VALUE11258 = 150;
+  ENUM_VALUE11259 = 151;
+  ENUM_VALUE11260 = 152;
+  ENUM_VALUE11261 = 153;
+  ENUM_VALUE11262 = 154;
+  ENUM_VALUE11263 = 155;
+  ENUM_VALUE11264 = 156;
+  ENUM_VALUE11265 = 157;
+  ENUM_VALUE11266 = 158;
+  ENUM_VALUE11267 = 159;
+  ENUM_VALUE11268 = 160;
+  ENUM_VALUE11269 = 161;
+  ENUM_VALUE11270 = 163;
+  ENUM_VALUE11271 = 164;
+  ENUM_VALUE11272 = 165;
+  ENUM_VALUE11273 = 166;
+  ENUM_VALUE11274 = 167;
+  ENUM_VALUE11275 = 168;
+  ENUM_VALUE11276 = 169;
+  ENUM_VALUE11277 = 170;
+  ENUM_VALUE11278 = 171;
+  ENUM_VALUE11279 = 172;
+  ENUM_VALUE11280 = 173;
+  ENUM_VALUE11281 = 174;
+  ENUM_VALUE11282 = 175;
+  ENUM_VALUE11283 = 176;
+  ENUM_VALUE11284 = 177;
+  ENUM_VALUE11285 = 178;
+  ENUM_VALUE11286 = 179;
+  ENUM_VALUE11287 = 180;
+  ENUM_VALUE11288 = 181;
+  ENUM_VALUE11289 = 182;
+  ENUM_VALUE11290 = 183;
+  ENUM_VALUE11291 = 184;
+  ENUM_VALUE11292 = 185;
+  ENUM_VALUE11293 = 187;
+  ENUM_VALUE11294 = 188;
+  ENUM_VALUE11295 = 189;
+  ENUM_VALUE11296 = 190;
+  ENUM_VALUE11297 = 191;
+  ENUM_VALUE11298 = 192;
+  ENUM_VALUE11299 = 193;
+  ENUM_VALUE11300 = 194;
+  ENUM_VALUE11301 = 195;
+  ENUM_VALUE11302 = 196;
+  ENUM_VALUE11303 = 197;
+  ENUM_VALUE11304 = 198;
+  ENUM_VALUE11305 = 65535;
+  ENUM_VALUE11306 = 65536;
+  ENUM_VALUE11307 = 65537;
+  ENUM_VALUE11308 = 65538;
+  ENUM_VALUE11309 = 65539;
+  ENUM_VALUE11310 = 65540;
+  ENUM_VALUE11311 = 65541;
+  ENUM_VALUE11312 = 65542;
+  ENUM_VALUE11313 = 65543;
+  ENUM_VALUE11314 = 65544;
+  ENUM_VALUE11315 = 65545;
+  ENUM_VALUE11316 = 65546;
+  ENUM_VALUE11317 = 65547;
+  ENUM_VALUE11318 = 65548;
+  ENUM_VALUE11319 = 65549;
+  ENUM_VALUE11320 = 65550;
+  ENUM_VALUE11321 = 65551;
+  ENUM_VALUE11322 = 65552;
+  ENUM_VALUE11323 = 65553;
+  ENUM_VALUE11324 = 65554;
+  ENUM_VALUE11325 = 65555;
+  ENUM_VALUE11326 = 65556;
+  ENUM_VALUE11327 = 65557;
+  ENUM_VALUE11328 = 65558;
+  ENUM_VALUE11329 = 65559;
+  ENUM_VALUE11330 = 65560;
+  ENUM_VALUE11331 = 65561;
+  ENUM_VALUE11332 = 65562;
+  ENUM_VALUE11333 = 65563;
+  ENUM_VALUE11334 = 69632;
+  ENUM_VALUE11335 = 69633;
+  ENUM_VALUE11336 = 69634;
+  ENUM_VALUE11337 = 69635;
+  ENUM_VALUE11338 = 69636;
+  ENUM_VALUE11339 = 69637;
+  ENUM_VALUE11340 = 69638;
+  ENUM_VALUE11341 = 69639;
+  ENUM_VALUE11342 = 69640;
+  ENUM_VALUE11343 = 69641;
+  ENUM_VALUE11344 = 69642;
+  ENUM_VALUE11345 = 69643;
+  ENUM_VALUE11346 = 69644;
+  ENUM_VALUE11347 = 69645;
+  ENUM_VALUE11348 = 69646;
+  ENUM_VALUE11349 = 69647;
+  ENUM_VALUE11350 = 69648;
+  ENUM_VALUE11351 = 69649;
+  ENUM_VALUE11352 = 69650;
+  ENUM_VALUE11353 = 69651;
+  ENUM_VALUE11354 = 69652;
+  ENUM_VALUE11355 = 69653;
+  ENUM_VALUE11356 = 69654;
+  ENUM_VALUE11357 = 69655;
+  ENUM_VALUE11358 = 69656;
+  ENUM_VALUE11359 = 69657;
+  ENUM_VALUE11360 = 69658;
+  ENUM_VALUE11361 = 69659;
+  ENUM_VALUE11362 = 69660;
+  ENUM_VALUE11363 = 69661;
+  ENUM_VALUE11364 = 69662;
+  ENUM_VALUE11365 = 73728;
+  ENUM_VALUE11366 = 73729;
+  ENUM_VALUE11367 = 77824;
+  ENUM_VALUE11368 = 77825;
+  ENUM_VALUE11369 = 81920;
+  ENUM_VALUE11370 = 81921;
+  ENUM_VALUE11371 = 81922;
+  ENUM_VALUE11372 = 81923;
+  ENUM_VALUE11373 = 86016;
+  ENUM_VALUE11374 = 86017;
+  ENUM_VALUE11375 = 86018;
+  ENUM_VALUE11376 = 86019;
+  ENUM_VALUE11377 = 86020;
+  ENUM_VALUE11378 = 86021;
+  ENUM_VALUE11379 = 86022;
+  ENUM_VALUE11380 = 86023;
+  ENUM_VALUE11381 = 86024;
+  ENUM_VALUE11382 = 86025;
+  ENUM_VALUE11383 = 86026;
+  ENUM_VALUE11384 = 86027;
+  ENUM_VALUE11385 = 86028;
+  ENUM_VALUE11386 = 86029;
+  ENUM_VALUE11387 = 86030;
+  ENUM_VALUE11388 = 86031;
+  ENUM_VALUE11389 = 86032;
+  ENUM_VALUE11390 = 86033;
+  ENUM_VALUE11391 = 86034;
+  ENUM_VALUE11392 = 86035;
+  ENUM_VALUE11393 = 86036;
+  ENUM_VALUE11394 = 86037;
+  ENUM_VALUE11395 = 86038;
+  ENUM_VALUE11396 = 86039;
+  ENUM_VALUE11397 = 86040;
+  ENUM_VALUE11398 = 86041;
+  ENUM_VALUE11399 = 86042;
+  ENUM_VALUE11400 = 86043;
+  ENUM_VALUE11401 = 86044;
+  ENUM_VALUE11402 = 86045;
+  ENUM_VALUE11403 = 86046;
+  ENUM_VALUE11404 = 86047;
+  ENUM_VALUE11405 = 86048;
+  ENUM_VALUE11406 = 86049;
+  ENUM_VALUE11407 = 86050;
+  ENUM_VALUE11408 = 86051;
+  ENUM_VALUE11409 = 86052;
+  ENUM_VALUE11410 = 86053;
+  ENUM_VALUE11411 = 86054;
+  ENUM_VALUE11412 = 86055;
+  ENUM_VALUE11413 = 86056;
+  ENUM_VALUE11414 = 86057;
+  ENUM_VALUE11415 = 86058;
+  ENUM_VALUE11416 = 86059;
+  ENUM_VALUE11417 = 86060;
+  ENUM_VALUE11418 = 86061;
+  ENUM_VALUE11419 = 86062;
+  ENUM_VALUE11420 = 86063;
+  ENUM_VALUE11421 = 86064;
+  ENUM_VALUE11422 = 86065;
+  ENUM_VALUE11423 = 86066;
+  ENUM_VALUE11424 = 86067;
+  ENUM_VALUE11425 = 86068;
+  ENUM_VALUE11426 = 86069;
+  ENUM_VALUE11427 = 86070;
+  ENUM_VALUE11428 = 86071;
+  ENUM_VALUE11429 = 86072;
+  ENUM_VALUE11430 = 86073;
+  ENUM_VALUE11431 = 86074;
+  ENUM_VALUE11432 = 86077;
+  ENUM_VALUE11433 = 86078;
+  ENUM_VALUE11434 = 86079;
+  ENUM_VALUE11435 = 86080;
+  ENUM_VALUE11436 = 86081;
+  ENUM_VALUE11437 = 86082;
+  ENUM_VALUE11438 = 86083;
+  ENUM_VALUE11439 = 86084;
+  ENUM_VALUE11440 = 90112;
+  ENUM_VALUE11441 = 94208;
+  ENUM_VALUE11442 = 94209;
+  ENUM_VALUE11443 = 94210;
+  ENUM_VALUE11444 = 94211;
+  ENUM_VALUE11445 = 94212;
+  ENUM_VALUE11446 = 94213;
+  ENUM_VALUE11447 = 94214;
+  ENUM_VALUE11448 = 94215;
+  ENUM_VALUE11449 = 94216;
+  ENUM_VALUE11450 = 94217;
+  ENUM_VALUE11451 = 94218;
+  ENUM_VALUE11452 = 94219;
+  ENUM_VALUE11453 = 94220;
+  ENUM_VALUE11454 = 94221;
+  ENUM_VALUE11455 = 94222;
+  ENUM_VALUE11456 = 94223;
+  ENUM_VALUE11457 = 94224;
+  ENUM_VALUE11458 = 98304;
+  ENUM_VALUE11459 = 98305;
+  ENUM_VALUE11460 = 98306;
+  ENUM_VALUE11461 = 98307;
+  ENUM_VALUE11462 = 98308;
+  ENUM_VALUE11463 = 102400;
+  ENUM_VALUE11464 = 131072;
+  ENUM_VALUE11465 = 131073;
+  ENUM_VALUE11466 = 135168;
+  ENUM_VALUE11467 = 9439507;
+}
+
+enum Enum11541 {
+  ENUM_VALUE11542 = -1;
+  ENUM_VALUE11543 = 0;
+  ENUM_VALUE11544 = 1;
+  ENUM_VALUE11545 = 2;
+  ENUM_VALUE11546 = 3;
+  ENUM_VALUE11547 = 4;
+  ENUM_VALUE11548 = 5;
+  ENUM_VALUE11549 = 6;
+  ENUM_VALUE11550 = 7;
+  ENUM_VALUE11551 = 8;
+  ENUM_VALUE11552 = 9;
+  ENUM_VALUE11553 = 10;
+  ENUM_VALUE11554 = 11;
+  ENUM_VALUE11555 = 12;
+  ENUM_VALUE11556 = 13;
+  ENUM_VALUE11557 = 14;
+  ENUM_VALUE11558 = 15;
+  ENUM_VALUE11559 = 16;
+  ENUM_VALUE11560 = 17;
+  ENUM_VALUE11561 = 18;
+  ENUM_VALUE11562 = 19;
+  ENUM_VALUE11563 = 20;
+  ENUM_VALUE11564 = 21;
+  ENUM_VALUE11565 = 22;
+  ENUM_VALUE11566 = 23;
+  ENUM_VALUE11567 = 24;
+  ENUM_VALUE11568 = 25;
+  ENUM_VALUE11569 = 26;
+  ENUM_VALUE11570 = 27;
+  ENUM_VALUE11571 = 28;
+  ENUM_VALUE11572 = 29;
+  ENUM_VALUE11573 = 30;
+  ENUM_VALUE11574 = 31;
+  ENUM_VALUE11575 = 32;
+  ENUM_VALUE11576 = 33;
+  ENUM_VALUE11577 = 34;
+  ENUM_VALUE11578 = 35;
+  ENUM_VALUE11579 = 36;
+  ENUM_VALUE11580 = 37;
+  ENUM_VALUE11581 = 38;
+  ENUM_VALUE11582 = 39;
+  ENUM_VALUE11583 = 40;
+  ENUM_VALUE11584 = 41;
+  ENUM_VALUE11585 = 42;
+  ENUM_VALUE11586 = 43;
+  ENUM_VALUE11587 = 44;
+  ENUM_VALUE11588 = 45;
+  ENUM_VALUE11589 = 46;
+  ENUM_VALUE11590 = 47;
+  ENUM_VALUE11591 = 48;
+  ENUM_VALUE11592 = 49;
+  ENUM_VALUE11593 = 50;
+  ENUM_VALUE11594 = 51;
+  ENUM_VALUE11595 = 52;
+  ENUM_VALUE11596 = 53;
+  ENUM_VALUE11597 = 54;
+  ENUM_VALUE11598 = 55;
+  ENUM_VALUE11599 = 56;
+  ENUM_VALUE11600 = 57;
+  ENUM_VALUE11601 = 58;
+  ENUM_VALUE11602 = 59;
+  ENUM_VALUE11603 = 60;
+  ENUM_VALUE11604 = 61;
+  ENUM_VALUE11605 = 62;
+  ENUM_VALUE11606 = 63;
+  ENUM_VALUE11607 = 64;
+  ENUM_VALUE11608 = 65;
+  ENUM_VALUE11609 = 66;
+  ENUM_VALUE11610 = 67;
+  ENUM_VALUE11611 = 68;
+  ENUM_VALUE11612 = 69;
+  ENUM_VALUE11613 = 70;
+  ENUM_VALUE11614 = 71;
+  ENUM_VALUE11615 = 72;
+  ENUM_VALUE11616 = 73;
+  ENUM_VALUE11617 = 74;
+  ENUM_VALUE11618 = 75;
+  ENUM_VALUE11619 = 76;
+  ENUM_VALUE11620 = 77;
+  ENUM_VALUE11621 = 78;
+  ENUM_VALUE11622 = 79;
+  ENUM_VALUE11623 = 80;
+  ENUM_VALUE11624 = 81;
+  ENUM_VALUE11625 = 82;
+  ENUM_VALUE11626 = 83;
+  ENUM_VALUE11627 = 84;
+  ENUM_VALUE11628 = 85;
+  ENUM_VALUE11629 = 86;
+  ENUM_VALUE11630 = 87;
+  ENUM_VALUE11631 = 88;
+  ENUM_VALUE11632 = 89;
+  ENUM_VALUE11633 = 90;
+  ENUM_VALUE11634 = 91;
+  ENUM_VALUE11635 = 92;
+  ENUM_VALUE11636 = 93;
+  ENUM_VALUE11637 = 94;
+  ENUM_VALUE11638 = 95;
+  ENUM_VALUE11639 = 96;
+  ENUM_VALUE11640 = 97;
+  ENUM_VALUE11641 = 98;
+  ENUM_VALUE11642 = 99;
+  ENUM_VALUE11643 = 100;
+  ENUM_VALUE11644 = 101;
+  ENUM_VALUE11645 = 102;
+  ENUM_VALUE11646 = 103;
+  ENUM_VALUE11647 = 104;
+  ENUM_VALUE11648 = 105;
+  ENUM_VALUE11649 = 106;
+  ENUM_VALUE11650 = 107;
+  ENUM_VALUE11651 = 108;
+  ENUM_VALUE11652 = 109;
+  ENUM_VALUE11653 = 110;
+  ENUM_VALUE11654 = 111;
+  ENUM_VALUE11655 = 112;
+  ENUM_VALUE11656 = 113;
+  ENUM_VALUE11657 = 114;
+  ENUM_VALUE11658 = 115;
+  ENUM_VALUE11659 = 116;
+  ENUM_VALUE11660 = 117;
+  ENUM_VALUE11661 = 118;
+  ENUM_VALUE11662 = 119;
+  ENUM_VALUE11663 = 120;
+  ENUM_VALUE11664 = 121;
+  ENUM_VALUE11665 = 122;
+  ENUM_VALUE11666 = 123;
+  ENUM_VALUE11667 = 124;
+  ENUM_VALUE11668 = 125;
+  ENUM_VALUE11669 = 126;
+  ENUM_VALUE11670 = 127;
+  ENUM_VALUE11671 = 128;
+  ENUM_VALUE11672 = 129;
+  ENUM_VALUE11673 = 130;
+  ENUM_VALUE11674 = 131;
+  ENUM_VALUE11675 = 132;
+  ENUM_VALUE11676 = 133;
+  ENUM_VALUE11677 = 134;
+  ENUM_VALUE11678 = 135;
+  ENUM_VALUE11679 = 136;
+  ENUM_VALUE11680 = 137;
+  ENUM_VALUE11681 = 138;
+  ENUM_VALUE11682 = 139;
+  ENUM_VALUE11683 = 140;
+  ENUM_VALUE11684 = 141;
+  ENUM_VALUE11685 = 142;
+  ENUM_VALUE11686 = 143;
+  ENUM_VALUE11687 = 144;
+  ENUM_VALUE11688 = 145;
+  ENUM_VALUE11689 = 146;
+  ENUM_VALUE11690 = 147;
+  ENUM_VALUE11691 = 148;
+  ENUM_VALUE11692 = 149;
+  ENUM_VALUE11693 = 150;
+  ENUM_VALUE11694 = 151;
+  ENUM_VALUE11695 = 152;
+  ENUM_VALUE11696 = 153;
+  ENUM_VALUE11697 = 154;
+  ENUM_VALUE11698 = 155;
+  ENUM_VALUE11699 = 156;
+  ENUM_VALUE11700 = 157;
+  ENUM_VALUE11701 = 158;
+  ENUM_VALUE11702 = 159;
+  ENUM_VALUE11703 = 160;
+  ENUM_VALUE11704 = 161;
+  ENUM_VALUE11705 = 162;
+  ENUM_VALUE11706 = 163;
+  ENUM_VALUE11707 = 164;
+  ENUM_VALUE11708 = 165;
+  ENUM_VALUE11709 = 166;
+  ENUM_VALUE11710 = 167;
+  ENUM_VALUE11711 = 168;
+  ENUM_VALUE11712 = 169;
+  ENUM_VALUE11713 = 170;
+  ENUM_VALUE11714 = 171;
+  ENUM_VALUE11715 = 172;
+  ENUM_VALUE11716 = 173;
+  ENUM_VALUE11717 = 174;
+  ENUM_VALUE11718 = 175;
+  ENUM_VALUE11719 = 176;
+  ENUM_VALUE11720 = 177;
+  ENUM_VALUE11721 = 178;
+  ENUM_VALUE11722 = 179;
+  ENUM_VALUE11723 = 180;
+  ENUM_VALUE11724 = 181;
+  ENUM_VALUE11725 = 182;
+  ENUM_VALUE11726 = 183;
+  ENUM_VALUE11727 = 184;
+  ENUM_VALUE11728 = 185;
+  ENUM_VALUE11729 = 186;
+  ENUM_VALUE11730 = 187;
+  ENUM_VALUE11731 = 188;
+  ENUM_VALUE11732 = 16777215;
+}
+
+enum Enum11468 {
+  ENUM_VALUE11469 = -99;
+  ENUM_VALUE11470 = 0;
+  ENUM_VALUE11471 = 1;
+  ENUM_VALUE11472 = 2;
+  ENUM_VALUE11473 = 3;
+  ENUM_VALUE11474 = 4;
+  ENUM_VALUE11475 = 28;
+  ENUM_VALUE11476 = 22;
+  ENUM_VALUE11477 = 38;
+  ENUM_VALUE11478 = 512;
+  ENUM_VALUE11479 = 2048;
+  ENUM_VALUE11480 = 66;
+  ENUM_VALUE11481 = 578;
+  ENUM_VALUE11482 = 77;
+  ENUM_VALUE11483 = 88;
+  ENUM_VALUE11484 = 100;
+  ENUM_VALUE11485 = 110;
+  ENUM_VALUE11486 = 2158;
+  ENUM_VALUE11487 = 122;
+  ENUM_VALUE11488 = 2170;
+  ENUM_VALUE11489 = 144;
+  ENUM_VALUE11490 = 244;
+  ENUM_VALUE11491 = 2292;
+  ENUM_VALUE11492 = 44;
+}
+
+enum Enum11022 {
+  ENUM_VALUE11023 = 0;
+  ENUM_VALUE11024 = 1;
+  ENUM_VALUE11025 = 2;
+  ENUM_VALUE11026 = 3;
+  ENUM_VALUE11027 = 4;
+  ENUM_VALUE11028 = 5;
+  ENUM_VALUE11029 = 6;
+  ENUM_VALUE11030 = 7;
+  ENUM_VALUE11031 = 8;
+  ENUM_VALUE11032 = 9;
+  ENUM_VALUE11033 = 10;
+  ENUM_VALUE11034 = 11;
+  ENUM_VALUE11035 = 12;
+  ENUM_VALUE11036 = 13;
+  ENUM_VALUE11037 = 14;
+  ENUM_VALUE11038 = 15;
+  ENUM_VALUE11039 = 16;
+  ENUM_VALUE11040 = 17;
+  ENUM_VALUE11041 = 18;
+  ENUM_VALUE11042 = 19;
+  ENUM_VALUE11043 = 20;
+  ENUM_VALUE11044 = 21;
+  ENUM_VALUE11045 = 22;
+  ENUM_VALUE11046 = 23;
+  ENUM_VALUE11047 = 24;
+  ENUM_VALUE11048 = 25;
+  ENUM_VALUE11049 = 26;
+  ENUM_VALUE11050 = 27;
+  ENUM_VALUE11051 = 28;
+  ENUM_VALUE11052 = 29;
+  ENUM_VALUE11053 = 30;
+  ENUM_VALUE11054 = 31;
+  ENUM_VALUE11055 = 32;
+  ENUM_VALUE11056 = 33;
+  ENUM_VALUE11057 = 34;
+  ENUM_VALUE11058 = 35;
+  ENUM_VALUE11059 = 36;
+  ENUM_VALUE11060 = 37;
+  ENUM_VALUE11061 = 38;
+  ENUM_VALUE11062 = 39;
+  ENUM_VALUE11063 = 40;
+  ENUM_VALUE11064 = 41;
+  ENUM_VALUE11065 = 42;
+  ENUM_VALUE11066 = 43;
+  ENUM_VALUE11067 = 44;
+  ENUM_VALUE11068 = 45;
+  ENUM_VALUE11069 = 46;
+  ENUM_VALUE11070 = 47;
+  ENUM_VALUE11071 = 48;
+  ENUM_VALUE11072 = 49;
+  ENUM_VALUE11073 = 50;
+  ENUM_VALUE11074 = 51;
+  ENUM_VALUE11075 = 52;
+  ENUM_VALUE11076 = 53;
+  ENUM_VALUE11077 = 54;
+  ENUM_VALUE11078 = 55;
+  ENUM_VALUE11079 = 56;
+  ENUM_VALUE11080 = 57;
+  ENUM_VALUE11081 = 58;
+  ENUM_VALUE11082 = 59;
+  ENUM_VALUE11083 = 60;
+  ENUM_VALUE11084 = 61;
+  ENUM_VALUE11085 = 62;
+  ENUM_VALUE11086 = 63;
+  ENUM_VALUE11087 = 64;
+  ENUM_VALUE11088 = 65;
+  ENUM_VALUE11089 = 66;
+  ENUM_VALUE11090 = 67;
+  ENUM_VALUE11091 = 68;
+  ENUM_VALUE11092 = 69;
+  ENUM_VALUE11093 = 70;
+  ENUM_VALUE11094 = 71;
+  ENUM_VALUE11095 = 72;
+  ENUM_VALUE11096 = 73;
+  ENUM_VALUE11097 = 74;
+  ENUM_VALUE11098 = 75;
+  ENUM_VALUE11099 = 76;
+  ENUM_VALUE11100 = 77;
+  ENUM_VALUE11101 = 78;
+  ENUM_VALUE11102 = 79;
+  ENUM_VALUE11103 = 80;
+  ENUM_VALUE11104 = 81;
+  ENUM_VALUE11105 = 82;
+  ENUM_VALUE11106 = 83;
+}
+
+enum Enum12670 {
+  ENUM_VALUE12671 = 0;
+  ENUM_VALUE12672 = 1;
+  ENUM_VALUE12673 = 2;
+}
+
+enum Enum12871 {
+  ENUM_VALUE12872 = 1;
+  ENUM_VALUE12873 = 2;
+  ENUM_VALUE12874 = 3;
+  ENUM_VALUE12875 = 4;
+  ENUM_VALUE12876 = 5;
+  ENUM_VALUE12877 = 6;
+}
+
+enum Enum13092 {
+  ENUM_VALUE13093 = 1;
+  ENUM_VALUE13094 = 2;
+  ENUM_VALUE13095 = 3;
+}
+
+enum Enum13146 {
+  ENUM_VALUE13147 = 0;
+  ENUM_VALUE13148 = 1;
+  ENUM_VALUE13149 = 2;
+  ENUM_VALUE13150 = 3;
+}
+
+enum Enum16042 {
+  ENUM_VALUE16043 = 0;
+  ENUM_VALUE16044 = 1;
+  ENUM_VALUE16045 = 17;
+  ENUM_VALUE16046 = 273;
+  ENUM_VALUE16047 = 274;
+  ENUM_VALUE16048 = 4385;
+  ENUM_VALUE16049 = 4386;
+  ENUM_VALUE16050 = 4387;
+  ENUM_VALUE16051 = 4388;
+  ENUM_VALUE16052 = 4389;
+  ENUM_VALUE16053 = 4390;
+  ENUM_VALUE16054 = 4391;
+  ENUM_VALUE16055 = 4392;
+  ENUM_VALUE16056 = 4393;
+  ENUM_VALUE16057 = 276;
+  ENUM_VALUE16058 = 277;
+  ENUM_VALUE16059 = 18;
+  ENUM_VALUE16060 = 289;
+  ENUM_VALUE16061 = 291;
+  ENUM_VALUE16062 = 4657;
+  ENUM_VALUE16063 = 74513;
+  ENUM_VALUE16064 = 4658;
+  ENUM_VALUE16065 = 4659;
+  ENUM_VALUE16066 = 4660;
+  ENUM_VALUE16067 = 4661;
+  ENUM_VALUE16068 = 4662;
+  ENUM_VALUE16069 = 4663;
+  ENUM_VALUE16070 = 4664;
+  ENUM_VALUE16071 = 292;
+  ENUM_VALUE16072 = 4673;
+  ENUM_VALUE16073 = 4674;
+  ENUM_VALUE16074 = 293;
+  ENUM_VALUE16075 = 19;
+  ENUM_VALUE16076 = 20;
+  ENUM_VALUE16077 = 321;
+  ENUM_VALUE16078 = 5137;
+  ENUM_VALUE16079 = 5138;
+  ENUM_VALUE16080 = 5139;
+  ENUM_VALUE16081 = 5140;
+  ENUM_VALUE16082 = 5141;
+  ENUM_VALUE16083 = 5142;
+  ENUM_VALUE16084 = 82273;
+  ENUM_VALUE16085 = 82274;
+  ENUM_VALUE16086 = 82275;
+  ENUM_VALUE16087 = 82276;
+  ENUM_VALUE16088 = 82277;
+  ENUM_VALUE16089 = 82278;
+  ENUM_VALUE16090 = 5143;
+  ENUM_VALUE16091 = 5144;
+  ENUM_VALUE16092 = 5145;
+  ENUM_VALUE16093 = 5146;
+  ENUM_VALUE16094 = 82337;
+  ENUM_VALUE16095 = 5147;
+  ENUM_VALUE16096 = 5148;
+  ENUM_VALUE16097 = 322;
+  ENUM_VALUE16098 = 323;
+  ENUM_VALUE16099 = 324;
+  ENUM_VALUE16100 = 325;
+  ENUM_VALUE16101 = 326;
+  ENUM_VALUE16102 = 327;
+  ENUM_VALUE16103 = 328;
+  ENUM_VALUE16104 = 21;
+  ENUM_VALUE16105 = 337;
+  ENUM_VALUE16106 = 22;
+  ENUM_VALUE16107 = 23;
+  ENUM_VALUE16108 = 24;
+  ENUM_VALUE16109 = 2;
+  ENUM_VALUE16110 = 33;
+  ENUM_VALUE16111 = 34;
+  ENUM_VALUE16112 = 545;
+  ENUM_VALUE16113 = 8721;
+  ENUM_VALUE16114 = 8723;
+  ENUM_VALUE16115 = 8724;
+  ENUM_VALUE16116 = 546;
+  ENUM_VALUE16117 = 8739;
+  ENUM_VALUE16118 = 8740;
+  ENUM_VALUE16119 = 547;
+  ENUM_VALUE16120 = 548;
+  ENUM_VALUE16121 = 549;
+  ENUM_VALUE16122 = 550;
+  ENUM_VALUE16123 = 551;
+  ENUM_VALUE16124 = 552;
+  ENUM_VALUE16125 = 553;
+  ENUM_VALUE16126 = 35;
+  ENUM_VALUE16127 = 36;
+  ENUM_VALUE16128 = 37;
+  ENUM_VALUE16129 = 593;
+  ENUM_VALUE16130 = 594;
+  ENUM_VALUE16131 = 595;
+  ENUM_VALUE16132 = 596;
+  ENUM_VALUE16133 = 597;
+  ENUM_VALUE16134 = 38;
+  ENUM_VALUE16135 = 609;
+  ENUM_VALUE16136 = 610;
+  ENUM_VALUE16137 = 617;
+  ENUM_VALUE16138 = 614;
+  ENUM_VALUE16139 = 615;
+  ENUM_VALUE16140 = 616;
+  ENUM_VALUE16141 = 618;
+  ENUM_VALUE16142 = 620;
+  ENUM_VALUE16143 = 9937;
+  ENUM_VALUE16144 = 9938;
+  ENUM_VALUE16145 = 9939;
+  ENUM_VALUE16146 = 9940;
+  ENUM_VALUE16147 = 9941;
+  ENUM_VALUE16148 = 39;
+  ENUM_VALUE16149 = 40;
+  ENUM_VALUE16150 = 41;
+  ENUM_VALUE16151 = 42;
+  ENUM_VALUE16152 = 43;
+  ENUM_VALUE16153 = 44;
+  ENUM_VALUE16154 = 45;
+  ENUM_VALUE16155 = 11793;
+  ENUM_VALUE16156 = 3;
+  ENUM_VALUE16157 = 49;
+  ENUM_VALUE16158 = 50;
+  ENUM_VALUE16159 = 51;
+  ENUM_VALUE16160 = 817;
+  ENUM_VALUE16161 = 818;
+  ENUM_VALUE16162 = 819;
+  ENUM_VALUE16163 = 52;
+  ENUM_VALUE16164 = 833;
+  ENUM_VALUE16165 = 53;
+  ENUM_VALUE16166 = 54;
+  ENUM_VALUE16167 = 4;
+  ENUM_VALUE16168 = 1041;
+  ENUM_VALUE16169 = 16657;
+  ENUM_VALUE16170 = 16658;
+  ENUM_VALUE16171 = 16659;
+  ENUM_VALUE16172 = 16660;
+  ENUM_VALUE16173 = 16661;
+  ENUM_VALUE16174 = 1042;
+  ENUM_VALUE16175 = 16673;
+  ENUM_VALUE16176 = 1043;
+  ENUM_VALUE16177 = 16689;
+  ENUM_VALUE16178 = 16690;
+  ENUM_VALUE16179 = 16691;
+  ENUM_VALUE16180 = 16692;
+  ENUM_VALUE16181 = 16693;
+  ENUM_VALUE16182 = 16694;
+  ENUM_VALUE16183 = 16695;
+  ENUM_VALUE16184 = 1044;
+  ENUM_VALUE16185 = 16705;
+  ENUM_VALUE16186 = 16706;
+  ENUM_VALUE16187 = 16707;
+  ENUM_VALUE16188 = 16708;
+  ENUM_VALUE16189 = 16709;
+  ENUM_VALUE16190 = 16710;
+  ENUM_VALUE16191 = 16711;
+  ENUM_VALUE16192 = 16712;
+  ENUM_VALUE16193 = 16713;
+  ENUM_VALUE16194 = 1046;
+  ENUM_VALUE16195 = 16737;
+  ENUM_VALUE16196 = 1047;
+  ENUM_VALUE16197 = 16753;
+  ENUM_VALUE16198 = 268049;
+  ENUM_VALUE16199 = 268050;
+  ENUM_VALUE16200 = 268051;
+  ENUM_VALUE16201 = 268052;
+  ENUM_VALUE16202 = 1048;
+  ENUM_VALUE16203 = 16769;
+  ENUM_VALUE16204 = 16770;
+  ENUM_VALUE16205 = 16771;
+  ENUM_VALUE16206 = 16772;
+  ENUM_VALUE16207 = 16773;
+  ENUM_VALUE16208 = 1049;
+  ENUM_VALUE16209 = 1056;
+  ENUM_VALUE16210 = 1058;
+  ENUM_VALUE16211 = 1059;
+  ENUM_VALUE16212 = 1060;
+  ENUM_VALUE16213 = 1061;
+  ENUM_VALUE16214 = 5;
+  ENUM_VALUE16215 = 6;
+  ENUM_VALUE16216 = 97;
+  ENUM_VALUE16217 = 98;
+  ENUM_VALUE16218 = 99;
+  ENUM_VALUE16219 = 100;
+  ENUM_VALUE16220 = 101;
+  ENUM_VALUE16221 = 102;
+  ENUM_VALUE16222 = 103;
+  ENUM_VALUE16223 = 104;
+  ENUM_VALUE16224 = 105;
+  ENUM_VALUE16225 = 106;
+  ENUM_VALUE16226 = 108;
+  ENUM_VALUE16227 = 1729;
+  ENUM_VALUE16228 = 1730;
+  ENUM_VALUE16229 = 1731;
+  ENUM_VALUE16230 = 7;
+  ENUM_VALUE16231 = 8;
+  ENUM_VALUE16232 = 9;
+  ENUM_VALUE16233 = 10;
+  ENUM_VALUE16234 = 161;
+  ENUM_VALUE16235 = 2577;
+  ENUM_VALUE16236 = 41233;
+  ENUM_VALUE16237 = 41234;
+  ENUM_VALUE16238 = 2578;
+  ENUM_VALUE16239 = 2579;
+  ENUM_VALUE16240 = 41265;
+  ENUM_VALUE16241 = 2580;
+  ENUM_VALUE16242 = 2581;
+  ENUM_VALUE16243 = 41297;
+  ENUM_VALUE16244 = 41298;
+  ENUM_VALUE16245 = 41299;
+  ENUM_VALUE16246 = 41300;
+  ENUM_VALUE16247 = 2582;
+  ENUM_VALUE16248 = 2583;
+  ENUM_VALUE16249 = 2584;
+  ENUM_VALUE16250 = 162;
+  ENUM_VALUE16251 = 2593;
+  ENUM_VALUE16252 = 41489;
+  ENUM_VALUE16253 = 663825;
+  ENUM_VALUE16254 = 663826;
+  ENUM_VALUE16255 = 41490;
+  ENUM_VALUE16256 = 41491;
+  ENUM_VALUE16257 = 41492;
+  ENUM_VALUE16258 = 663873;
+  ENUM_VALUE16259 = 2594;
+  ENUM_VALUE16260 = 41505;
+  ENUM_VALUE16261 = 41506;
+  ENUM_VALUE16262 = 41507;
+  ENUM_VALUE16263 = 2595;
+  ENUM_VALUE16264 = 41521;
+  ENUM_VALUE16265 = 41522;
+  ENUM_VALUE16266 = 41523;
+  ENUM_VALUE16267 = 41524;
+  ENUM_VALUE16268 = 41525;
+  ENUM_VALUE16269 = 664401;
+  ENUM_VALUE16270 = 664402;
+  ENUM_VALUE16271 = 41526;
+  ENUM_VALUE16272 = 41527;
+  ENUM_VALUE16273 = 2596;
+  ENUM_VALUE16274 = 2597;
+  ENUM_VALUE16275 = 2598;
+  ENUM_VALUE16276 = 41569;
+  ENUM_VALUE16277 = 41570;
+  ENUM_VALUE16278 = 41571;
+  ENUM_VALUE16279 = 41572;
+  ENUM_VALUE16280 = 41573;
+  ENUM_VALUE16281 = 665169;
+  ENUM_VALUE16282 = 665170;
+  ENUM_VALUE16283 = 665171;
+  ENUM_VALUE16284 = 665172;
+  ENUM_VALUE16285 = 2599;
+  ENUM_VALUE16286 = 2600;
+  ENUM_VALUE16287 = 2601;
+  ENUM_VALUE16288 = 2603;
+  ENUM_VALUE16289 = 2604;
+  ENUM_VALUE16290 = 163;
+  ENUM_VALUE16291 = 2608;
+  ENUM_VALUE16292 = 2609;
+  ENUM_VALUE16293 = 2610;
+  ENUM_VALUE16294 = 2611;
+  ENUM_VALUE16295 = 2612;
+  ENUM_VALUE16296 = 164;
+  ENUM_VALUE16297 = 2625;
+  ENUM_VALUE16298 = 2626;
+  ENUM_VALUE16299 = 42017;
+  ENUM_VALUE16300 = 42018;
+  ENUM_VALUE16301 = 42019;
+  ENUM_VALUE16302 = 2627;
+  ENUM_VALUE16303 = 2628;
+  ENUM_VALUE16304 = 165;
+  ENUM_VALUE16305 = 2641;
+  ENUM_VALUE16306 = 42257;
+  ENUM_VALUE16307 = 42258;
+  ENUM_VALUE16308 = 2642;
+  ENUM_VALUE16309 = 2643;
+  ENUM_VALUE16310 = 2644;
+  ENUM_VALUE16311 = 2646;
+  ENUM_VALUE16312 = 2647;
+  ENUM_VALUE16313 = 42353;
+  ENUM_VALUE16314 = 2648;
+  ENUM_VALUE16315 = 2649;
+  ENUM_VALUE16316 = 2650;
+  ENUM_VALUE16317 = 2651;
+  ENUM_VALUE16318 = 2652;
+  ENUM_VALUE16319 = 2653;
+  ENUM_VALUE16320 = 2654;
+  ENUM_VALUE16321 = 42481;
+  ENUM_VALUE16322 = 42482;
+  ENUM_VALUE16323 = 42483;
+  ENUM_VALUE16324 = 166;
+  ENUM_VALUE16325 = 2657;
+  ENUM_VALUE16326 = 2658;
+  ENUM_VALUE16327 = 42529;
+  ENUM_VALUE16328 = 2659;
+  ENUM_VALUE16329 = 2660;
+  ENUM_VALUE16330 = 2661;
+  ENUM_VALUE16331 = 2662;
+  ENUM_VALUE16332 = 2663;
+  ENUM_VALUE16333 = 42609;
+  ENUM_VALUE16334 = 2664;
+  ENUM_VALUE16335 = 2665;
+  ENUM_VALUE16336 = 42753;
+  ENUM_VALUE16337 = 42754;
+  ENUM_VALUE16338 = 42755;
+  ENUM_VALUE16339 = 11;
+  ENUM_VALUE16340 = 177;
+  ENUM_VALUE16341 = 2833;
+  ENUM_VALUE16342 = 179;
+  ENUM_VALUE16343 = 180;
+  ENUM_VALUE16344 = 2881;
+  ENUM_VALUE16345 = 182;
+  ENUM_VALUE16346 = 183;
+  ENUM_VALUE16347 = 12;
+  ENUM_VALUE16348 = 3089;
+  ENUM_VALUE16349 = 194;
+  ENUM_VALUE16350 = 195;
+  ENUM_VALUE16351 = 196;
+  ENUM_VALUE16352 = 198;
+  ENUM_VALUE16353 = 3169;
+  ENUM_VALUE16354 = 199;
+  ENUM_VALUE16355 = 200;
+  ENUM_VALUE16356 = 208;
+  ENUM_VALUE16357 = 3329;
+  ENUM_VALUE16358 = 3330;
+  ENUM_VALUE16359 = 3331;
+  ENUM_VALUE16360 = 209;
+  ENUM_VALUE16361 = 210;
+  ENUM_VALUE16362 = 211;
+  ENUM_VALUE16363 = 3377;
+  ENUM_VALUE16364 = 3378;
+  ENUM_VALUE16365 = 3379;
+  ENUM_VALUE16366 = 3380;
+  ENUM_VALUE16367 = 3381;
+  ENUM_VALUE16368 = 865809;
+  ENUM_VALUE16369 = 865810;
+  ENUM_VALUE16370 = 865811;
+  ENUM_VALUE16371 = 865812;
+  ENUM_VALUE16372 = 865813;
+  ENUM_VALUE16373 = 865814;
+  ENUM_VALUE16374 = 865815;
+  ENUM_VALUE16375 = 865816;
+  ENUM_VALUE16376 = 865817;
+  ENUM_VALUE16377 = 865818;
+  ENUM_VALUE16378 = 865819;
+  ENUM_VALUE16379 = 865820;
+  ENUM_VALUE16380 = 865821;
+  ENUM_VALUE16381 = 865822;
+  ENUM_VALUE16382 = 865823;
+  ENUM_VALUE16383 = 865824;
+  ENUM_VALUE16384 = 865825;
+  ENUM_VALUE16385 = 865826;
+  ENUM_VALUE16386 = 865827;
+  ENUM_VALUE16387 = 865828;
+  ENUM_VALUE16388 = 865829;
+  ENUM_VALUE16389 = 212;
+  ENUM_VALUE16390 = 3393;
+  ENUM_VALUE16391 = 3394;
+  ENUM_VALUE16392 = 3395;
+  ENUM_VALUE16393 = 213;
+  ENUM_VALUE16394 = 214;
+  ENUM_VALUE16395 = 215;
+  ENUM_VALUE16396 = 3441;
+  ENUM_VALUE16397 = 3442;
+  ENUM_VALUE16398 = 216;
+  ENUM_VALUE16399 = 217;
+  ENUM_VALUE16400 = 3473;
+  ENUM_VALUE16401 = 3474;
+  ENUM_VALUE16402 = 3475;
+  ENUM_VALUE16403 = 254;
+  ENUM_VALUE16404 = 255;
+}
+
+enum Enum16553 {
+  ENUM_VALUE16554 = 0;
+  ENUM_VALUE16555 = 1;
+  ENUM_VALUE16556 = 2;
+  ENUM_VALUE16557 = 3;
+  ENUM_VALUE16558 = 4;
+  ENUM_VALUE16559 = 5;
+  ENUM_VALUE16560 = 6;
+  ENUM_VALUE16561 = 7;
+  ENUM_VALUE16562 = 8;
+  ENUM_VALUE16563 = 9;
+}
+
+enum Enum16728 {
+  ENUM_VALUE16729 = 1;
+  ENUM_VALUE16730 = 2;
+  ENUM_VALUE16731 = 3;
+}
+
+enum Enum16732 {
+  ENUM_VALUE16733 = 1;
+  ENUM_VALUE16734 = 2;
+  ENUM_VALUE16735 = 3;
+  ENUM_VALUE16736 = 4;
+  ENUM_VALUE16737 = 5;
+}
+
+enum Enum16738 {
+  ENUM_VALUE16739 = 1;
+  ENUM_VALUE16740 = 2;
+  ENUM_VALUE16741 = 3;
+  ENUM_VALUE16742 = 4;
+  ENUM_VALUE16743 = 5;
+  ENUM_VALUE16744 = 6;
+  ENUM_VALUE16745 = 7;
+}
+
+enum Enum16698 {
+  ENUM_VALUE16699 = -1;
+  ENUM_VALUE16700 = 100;
+  ENUM_VALUE16701 = 2;
+  ENUM_VALUE16702 = 0;
+  ENUM_VALUE16703 = 1;
+  ENUM_VALUE16704 = 4;
+  ENUM_VALUE16705 = 11;
+  ENUM_VALUE16706 = 12;
+  ENUM_VALUE16707 = 3;
+  ENUM_VALUE16708 = 5;
+  ENUM_VALUE16709 = 6;
+  ENUM_VALUE16710 = 7;
+  ENUM_VALUE16711 = 8;
+  ENUM_VALUE16712 = 9;
+  ENUM_VALUE16713 = 10;
+  ENUM_VALUE16714 = 13;
+  ENUM_VALUE16715 = 14;
+  ENUM_VALUE16716 = 15;
+  ENUM_VALUE16717 = 16;
+  ENUM_VALUE16718 = 18;
+  ENUM_VALUE16719 = 17;
+  ENUM_VALUE16720 = 19;
+  ENUM_VALUE16721 = 20;
+}
+
+enum Enum16819 {
+  ENUM_VALUE16820 = 0;
+  ENUM_VALUE16821 = 1;
+  ENUM_VALUE16822 = 2;
+  ENUM_VALUE16823 = 3;
+  ENUM_VALUE16824 = 4;
+  ENUM_VALUE16825 = 5;
+}
+
+enum Enum16925 {
+  ENUM_VALUE16926 = 0;
+  ENUM_VALUE16927 = 1;
+  ENUM_VALUE16928 = 2;
+  ENUM_VALUE16929 = 3;
+  ENUM_VALUE16930 = 4;
+  ENUM_VALUE16931 = 5;
+  ENUM_VALUE16932 = 6;
+  ENUM_VALUE16933 = 7;
+  ENUM_VALUE16934 = 8;
+  ENUM_VALUE16935 = 9;
+  ENUM_VALUE16936 = 10;
+  ENUM_VALUE16937 = 11;
+  ENUM_VALUE16938 = 12;
+  ENUM_VALUE16939 = 13;
+}
+
+enum Enum22854 {
+  ENUM_VALUE22855 = 0;
+  ENUM_VALUE22856 = 1;
+}
+
+enum Enum24361 {
+  ENUM_VALUE24362 = 0;
+  ENUM_VALUE24363 = 1;
+  ENUM_VALUE24364 = 2;
+  ENUM_VALUE24365 = 3;
+}
+
+enum Enum16891 {
+  ENUM_VALUE16892 = 0;
+  ENUM_VALUE16893 = 1;
+  ENUM_VALUE16894 = 2;
+  ENUM_VALUE16895 = 3;
+  ENUM_VALUE16896 = 4;
+  ENUM_VALUE16897 = 5;
+  ENUM_VALUE16898 = 6;
+  ENUM_VALUE16899 = 7;
+  ENUM_VALUE16900 = 8;
+  ENUM_VALUE16901 = 9;
+  ENUM_VALUE16902 = 10;
+  ENUM_VALUE16903 = 11;
+  ENUM_VALUE16904 = 12;
+  ENUM_VALUE16905 = 13;
+  ENUM_VALUE16906 = 14;
+  ENUM_VALUE16907 = 15;
+  ENUM_VALUE16908 = 16;
+  ENUM_VALUE16909 = 17;
+  ENUM_VALUE16910 = 18;
+  ENUM_VALUE16911 = 19;
+  ENUM_VALUE16912 = 20;
+  ENUM_VALUE16913 = 21;
+  ENUM_VALUE16914 = 22;
+  ENUM_VALUE16915 = 23;
+  ENUM_VALUE16916 = 24;
+  ENUM_VALUE16917 = 25;
+  ENUM_VALUE16918 = 26;
+  ENUM_VALUE16919 = 27;
+  ENUM_VALUE16920 = 28;
+  ENUM_VALUE16921 = 29;
+  ENUM_VALUE16922 = 30;
+  ENUM_VALUE16923 = 31;
+}
+
+enum Enum27361 {
+  ENUM_VALUE27362 = 0;
+  ENUM_VALUE27363 = 1;
+  ENUM_VALUE27364 = 2;
+  ENUM_VALUE27365 = 3;
+  ENUM_VALUE27366 = 4;
+}
+
+enum Enum33960 {
+  ENUM_VALUE33961 = 0;
+  ENUM_VALUE33962 = 1;
+  ENUM_VALUE33963 = 2;
+  ENUM_VALUE33964 = 3;
+  ENUM_VALUE33965 = 4;
+  ENUM_VALUE33966 = 5;
+  ENUM_VALUE33967 = 6;
+}
+
+enum Enum34388 {
+  ENUM_VALUE34389 = 1;
+}
+
+enum Enum35477 {
+  ENUM_VALUE35478 = 4;
+  ENUM_VALUE35479 = 3;
+  ENUM_VALUE35480 = 2;
+  ENUM_VALUE35481 = 1;
+  ENUM_VALUE35482 = 0;
+}
+
+enum Enum35507 {
+  ENUM_VALUE35508 = 0;
+  ENUM_VALUE35509 = 1;
+  ENUM_VALUE35510 = 2;
+  ENUM_VALUE35511 = 3;
+  ENUM_VALUE35512 = 4;
+  ENUM_VALUE35513 = 5;
+  ENUM_VALUE35514 = 6;
+  ENUM_VALUE35515 = 7;
+  ENUM_VALUE35516 = 8;
+  ENUM_VALUE35517 = 9;
+}
+
+enum Enum36860 {
+  ENUM_VALUE36861 = 0;
+  ENUM_VALUE36862 = 1;
+  ENUM_VALUE36863 = 2;
+  ENUM_VALUE36864 = 3;
+  ENUM_VALUE36865 = 4;
+  ENUM_VALUE36866 = 5;
+  ENUM_VALUE36867 = 6;
+  ENUM_VALUE36868 = 7;
+}
+
+enum Enum36890 {
+  ENUM_VALUE36891 = 0;
+  ENUM_VALUE36892 = 1;
+}
+
diff --git a/benchmarks/datasets/google_message4/benchmark_message4.proto b/benchmarks/datasets/google_message4/benchmark_message4.proto
new file mode 100644
index 00000000..21613939
--- /dev/null
+++ b/benchmarks/datasets/google_message4/benchmark_message4.proto
@@ -0,0 +1,454 @@
+syntax = "proto2";
+
+import "datasets/google_message4/benchmark_message4_1.proto";
+import "datasets/google_message4/benchmark_message4_2.proto";
+import "datasets/google_message4/benchmark_message4_3.proto";
+package benchmarks.google_message4;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message GoogleMessage4 {
+  optional int32 field37503 = 1;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37504 = 2;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37505 = 3;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37506 = 4;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37507 = 5;
+  optional .benchmarks.google_message4.Message37489 field37508 = 6;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37509 = 7;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37510 = 8;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37511 = 9;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37512 = 10;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37513 = 11;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37514 = 12;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37515 = 13;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37516 = 14;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37517 = 15;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37518 = 16;
+}
+
+message Message37489 {
+  optional .benchmarks.google_message4.Message2517 field37534 = 3;
+  optional .benchmarks.google_message4.Message7330 field37535 = 4;
+  optional .benchmarks.google_message4.Message8815 field37536 = 6;
+  optional .benchmarks.google_message4.Message8817 field37537 = 7;
+  optional .benchmarks.google_message4.Message8835 field37538 = 8;
+  optional .benchmarks.google_message4.Message8848 field37539 = 9;
+  optional .benchmarks.google_message4.Message8856 field37540 = 11;
+  optional .benchmarks.google_message4.Message12717 field37541 = 15;
+  optional .benchmarks.google_message4.Message12748 field37542 = 20;
+  optional .benchmarks.google_message4.Message7319 field37543 = 22;
+  optional .benchmarks.google_message4.Message12908 field37544 = 24;
+  optional .benchmarks.google_message4.Message12910 field37545 = 25;
+  optional .benchmarks.google_message4.Message12960 field37546 = 30;
+  optional .benchmarks.google_message4.Message176 field37547 = 33;
+  optional .benchmarks.google_message4.Message13000 field37548 = 34;
+  optional .benchmarks.google_message4.Message13035 field37549 = 35;
+  optional .benchmarks.google_message4.Message37331 field37550 = 36;
+  optional .benchmarks.google_message4.Message37329 field37551 = 37;
+  optional .benchmarks.google_message4.Message37327 field37552 = 38;
+  optional .benchmarks.google_message4.Message37333 field37553 = 39;
+  optional .benchmarks.google_message4.Message37335 field37554 = 40;
+}
+
+message Message7319 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7321 = 1;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7322 = 7;
+}
+
+message Message12717 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12719 = 1;
+  optional string field12720 = 2;
+  optional uint32 field12721 = 3;
+  optional .benchmarks.google_message4.Message11976 field12722 = 4;
+  repeated .benchmarks.google_message4.Message11948 field12723 = 5;
+  optional .benchmarks.google_message4.Message11947 field12724 = 6;
+  optional .benchmarks.google_message4.Message12687 field12725 = 7;
+  repeated .benchmarks.google_message4.Message11948 field12726 = 8;
+  optional int64 field12727 = 9;
+}
+
+message Message37331 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37367 = 4;
+  required .benchmarks.google_message4.Message37326 field37368 = 1;
+  required int64 field37369 = 2;
+  required bytes field37370 = 3;
+}
+
+message Message8815 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8819 = 1;
+  repeated .benchmarks.google_message4.Message8768 field8820 = 2;
+  optional bool field8821 = 3;
+}
+
+message Message7330 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7332 = 1;
+  optional .benchmarks.google_message4.Message3069 field7333 = 2;
+  optional .benchmarks.google_message4.Message7320 field7334 = 3;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7335 = 4;
+  optional bool field7336 = 5;
+  optional int64 field7337 = 6;
+}
+
+message Message12960 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12962 = 1;
+  optional .benchmarks.google_message4.Message12948 field12963 = 2;
+}
+
+message Message176 {
+  required string field408 = 1;
+  optional int32 field409 = 4;
+  optional string field410 = 50;
+  optional int32 field411 = 2;
+  optional uint64 field412 = 47;
+  optional string field413 = 56;
+  optional int32 field414 = 24;
+  optional string field415 = 21;
+  optional bytes field416 = 3;
+  optional string field417 = 57;
+  optional int32 field418 = 51;
+  optional float field419 = 7;
+  optional bool field420 = 5;
+  optional bool field421 = 28;
+  optional int32 field422 = 6;
+  repeated int32 field423 = 40;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field424 = 41;
+  optional bool field425 = 25;
+  optional uint64 field426 = 26;
+  optional int32 field427 = 38;
+  optional bytes field428 = 15;
+  optional bytes field429 = 55;
+  optional bytes field430 = 16;
+  optional bytes field431 = 23;
+  optional bool field432 = 33;
+  optional bytes field433 = 31;
+  optional bytes field434 = 32;
+  optional int32 field435 = 36;
+  optional uint64 field436 = 17;
+  optional int32 field437 = 45;
+  optional uint64 field438 = 18;
+  optional string field439 = 46;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field440 = 64;
+  optional int32 field441 = 39;
+  optional uint64 field442 = 48;
+  optional bytes field443 = 19;
+  optional bytes field444 = 42;
+  optional bytes field445 = 43;
+  optional string field446 = 44;
+  optional string field447 = 49;
+  optional int64 field448 = 20;
+  optional bool field449 = 53;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field450 = 54;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field451 = 22;
+  optional .benchmarks.google_message4.UnusedEnum field452 = 27;
+  optional int32 field453 = 29;
+  optional int32 field454 = 30;
+  optional .benchmarks.google_message4.UnusedEnum field455 = 37;
+  optional .benchmarks.google_message4.UnusedEnum field456 = 34;
+  optional int32 field457 = 35;
+  repeated group Message178 = 101 {
+  }
+  optional bool field459 = 52;
+  optional uint64 field460 = 58;
+  optional uint64 field461 = 59;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field462 = 60;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field463 = 61;
+  optional .benchmarks.google_message4.UnusedEnum field464 = 62;
+  repeated string field465 = 63;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field466 = 65;
+}
+
+message Message8817 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8825 = 1;
+  repeated .benchmarks.google_message4.Message8768 field8826 = 2;
+  optional string field8827 = 3;
+}
+
+message Message8835 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8837 = 1;
+  repeated string field8838 = 2;
+  optional .benchmarks.google_message4.UnusedEnum field8839 = 3;
+}
+
+message Message37333 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37372 = 3;
+  required .benchmarks.google_message4.Message37326 field37373 = 1;
+  optional uint64 field37374 = 2;
+}
+
+message Message13000 {
+  optional int64 field13015 = 1;
+  repeated .benchmarks.google_message4.Message12979 field13016 = 2;
+}
+
+message Message37335 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37376 = 4;
+  required .benchmarks.google_message4.Message37326 field37377 = 1;
+  required .benchmarks.google_message4.Message37173 field37378 = 2;
+  optional uint64 field37379 = 3;
+}
+
+message Message8848 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8850 = 1;
+  optional string field8851 = 2;
+  optional bytes field8852 = 3;
+}
+
+message Message13035 {
+  optional int64 field13058 = 1;
+  repeated int64 field13059 = 2;
+}
+
+message Message8856 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8858 = 1;
+  optional string field8859 = 2;
+}
+
+message Message12908 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12912 = 1;
+  optional string field12913 = 2;
+  optional .benchmarks.google_message4.Message12799 field12914 = 3;
+  optional int64 field12915 = 4;
+  optional .benchmarks.google_message4.Message3804 field12916 = 5;
+  optional .benchmarks.google_message4.Message12870 field12917 = 6;
+}
+
+message Message12910 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12920 = 1;
+  optional .benchmarks.google_message4.Message12818 field12921 = 2;
+  repeated .benchmarks.google_message4.Message12903 field12922 = 3;
+}
+
+message Message37327 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37347 = 11;
+  required .benchmarks.google_message4.Message37326 field37348 = 1;
+  optional bool field37349 = 2;
+  optional bool field37350 = 3;
+  optional bool field37351 = 4;
+  optional bool field37352 = 5;
+  optional bool field37353 = 6;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37354 = 7;
+  optional uint64 field37355 = 8;
+  optional bool field37356 = 9;
+  optional bool field37357 = 10;
+}
+
+message Message37329 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37359 = 6;
+  required .benchmarks.google_message4.Message37326 field37360 = 1;
+  required int64 field37361 = 2;
+  required int64 field37362 = 3;
+  optional bool field37363 = 4;
+}
+
+message Message2517 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field2519 = 1;
+  optional .benchmarks.google_message4.Message2356 field2520 = 2;
+  optional .benchmarks.google_message4.Message0 field2521 = 3;
+  optional .benchmarks.google_message4.Message2463 field2522 = 4;
+  repeated .benchmarks.google_message4.Message971 field2523 = 5;
+}
+
+message Message12748 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12754 = 1;
+  optional string field12755 = 2;
+  optional string field12756 = 3;
+  optional .benchmarks.google_message4.Enum12735 field12757 = 4;
+}
+
+message Message12687 {
+  repeated .benchmarks.google_message4.Message12686 field12701 = 1;
+}
+
+message Message11948 {
+  optional string field11954 = 1;
+  repeated .benchmarks.google_message4.Message11949 field11955 = 2;
+  optional bool field11956 = 3;
+}
+
+message Message11976 {
+  repeated .benchmarks.google_message4.Message11975 field12002 = 1;
+}
+
+message Message7320 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7323 = 1;
+  optional .benchmarks.google_message4.Message7287 field7324 = 8;
+}
+
+message Message3069 {
+  optional .benchmarks.google_message4.Message3061 field3374 = 1;
+  optional bytes field3375 = 2;
+  repeated group Message3070 = 3 {
+    required .benchmarks.google_message4.Enum3071 field3378 = 4;
+    required bytes field3379 = 5;
+  }
+  extensions 10000 to 536870911;
+}
+
+message Message12948 {
+  repeated .benchmarks.google_message4.Message12949 field12958 = 1;
+}
+
+message Message8768 {
+  optional string field8782 = 1;
+  optional .benchmarks.google_message4.Message8572 field8783 = 2;
+  optional bool field8784 = 3;
+  repeated .benchmarks.google_message4.Message8774 field8785 = 4;
+  optional int64 field8786 = 5;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8787 = 6;
+  optional string field8788 = 7;
+}
+
+message Message12979 {
+  required bytes field12981 = 1;
+  repeated string field12982 = 2;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12983 = 3;
+  optional int64 field12984 = 4;
+  optional string field12985 = 5;
+  optional int32 field12986 = 6;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12987 = 7;
+}
+
+message Message37173 {
+  optional string field37252 = 1;
+  optional int64 field37253 = 2;
+  optional .benchmarks.google_message4.UnusedEnum field37254 = 4;
+  optional bool field37255 = 5;
+  optional bool field37256 = 6;
+  optional bool field37257 = 7;
+  optional string field37258 = 8;
+  optional string field37259 = 9;
+  optional uint32 field37260 = 10;
+  optional fixed32 field37261 = 11;
+  optional string field37262 = 12;
+  optional string field37263 = 13;
+  optional string field37264 = 14;
+  optional int32 field37265 = 15;
+  optional int64 field37266 = 16;
+  optional int64 field37267 = 17;
+  optional int32 field37268 = 18;
+  optional int32 field37269 = 19;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37270 = 20;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37271 = 21;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37272 = 22;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37273 = 23;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field37274 = 24;
+  optional string field37275 = 25;
+  optional bool field37276 = 26;
+}
+
+message Message12799 {
+  required string field12809 = 1;
+  repeated fixed64 field12810 = 2;
+  repeated .benchmarks.google_message4.Message12776 field12811 = 8;
+  repeated int32 field12812 = 4;
+  repeated .benchmarks.google_message4.Message12798 field12813 = 5;
+  required int32 field12814 = 3;
+  optional int32 field12815 = 6;
+  optional .benchmarks.google_message4.Message12797 field12816 = 7;
+}
+
+message Message12870 {
+  required int32 field12879 = 1;
+  optional int32 field12880 = 7;
+  required int32 field12881 = 2;
+  optional uint64 field12882 = 3;
+  optional string field12883 = 2001;
+  optional fixed64 field12884 = 4;
+  repeated fixed64 field12885 = 14;
+  optional int32 field12886 = 9;
+  optional int64 field12887 = 18;
+  repeated .benchmarks.google_message4.Message12870 field12888 = 8;
+  optional int32 field12889 = 5;
+  optional uint64 field12890 = 6;
+  optional int32 field12891 = 10;
+  optional int32 field12892 = 11;
+  optional double field12893 = 12;
+  optional .benchmarks.google_message4.Message12825 field12894 = 13;
+  optional double field12895 = 15;
+  optional string field12896 = 16;
+  optional .benchmarks.google_message4.Enum12871 field12897 = 17;
+  optional int32 field12898 = 19;
+}
+
+message Message3804 {
+  required int64 field3818 = 1;
+  required bool field3819 = 2;
+  repeated .benchmarks.google_message4.Enum3805 field3820 = 4;
+  optional int32 field3821 = 5;
+  optional bool field3822 = 6;
+  optional int64 field3823 = 7;
+  optional .benchmarks.google_message4.Enum3783 field3824 = 8;
+}
+
+message Message12903 {
+  optional string field12905 = 1;
+  optional .benchmarks.google_message4.Message8587 field12906 = 2;
+  repeated .benchmarks.google_message4.Message8590 field12907 = 3;
+}
+
+message Message37326 {
+  required string field37345 = 1;
+  optional string field37346 = 2;
+}
+
+message Message2356 {
+  optional .benchmarks.google_message4.Message1374 field2368 = 121;
+  optional uint64 field2369 = 1;
+  optional int32 field2370 = 2;
+  optional int32 field2371 = 17;
+  required string field2372 = 3;
+  optional int32 field2373 = 7;
+  optional bytes field2374 = 8;
+  optional string field2375 = 4;
+  optional string field2376 = 101;
+  optional int32 field2377 = 102;
+  optional int32 field2378 = 103;
+  optional int32 field2379 = 104;
+  optional int32 field2380 = 113;
+  optional int32 field2381 = 114;
+  optional int32 field2382 = 115;
+  optional int32 field2383 = 117;
+  optional int32 field2384 = 118;
+  optional int32 field2385 = 119;
+  optional int32 field2386 = 105;
+  optional bytes field2387 = 5;
+  optional group Message2357 = 6 {
+    optional int64 field2399 = 9;
+    optional int32 field2400 = 10;
+    optional int32 field2401 = 11;
+    optional int32 field2402 = 12;
+    optional int32 field2403 = 13;
+    optional int32 field2404 = 116;
+    optional int32 field2405 = 106;
+    required bytes field2406 = 14;
+    optional int32 field2407 = 45;
+    optional int32 field2408 = 112;
+    optional bool field2409 = 122;
+    optional bytes field2410 = 124;
+  }
+  optional string field2389 = 120;
+  optional group Message2358 = 107 {
+  }
+  repeated group Message2359 = 40 {
+  }
+  optional int32 field2392 = 50;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field2393 = 60;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field2394 = 70;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field2395 = 80;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field2396 = 90;
+  optional string field2397 = 100;
+  optional string field2398 = 123;
+}
+
+message Message0 {
+  option message_set_wire_format = true;
+  extensions 4 to 2147483646;
+}
+
+message Message971 {
+  optional string field972 = 1;
+  optional int32 field973 = 2;
+  optional bool field974 = 3;
+}
+
diff --git a/benchmarks/datasets/google_message4/benchmark_message4_1.proto b/benchmarks/datasets/google_message4/benchmark_message4_1.proto
new file mode 100644
index 00000000..e7697480
--- /dev/null
+++ b/benchmarks/datasets/google_message4/benchmark_message4_1.proto
@@ -0,0 +1,474 @@
+syntax = "proto2";
+
+import "datasets/google_message4/benchmark_message4_2.proto";
+import "datasets/google_message4/benchmark_message4_3.proto";
+package benchmarks.google_message4;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message2463 {
+  repeated .benchmarks.google_message4.Message2462 field2498 = 1;
+}
+
+message Message12686 {
+  optional string field12699 = 1;
+  optional .benchmarks.google_message4.Message12685 field12700 = 2;
+}
+
+message Message11949 {
+}
+
+message Message11975 {
+  optional string field11992 = 1;
+  optional int32 field11993 = 2;
+  repeated .benchmarks.google_message4.Message10320 field11994 = 3;
+  optional .benchmarks.google_message4.Message11947 field11995 = 4;
+  optional .benchmarks.google_message4.Message11920 field11996 = 5;
+  optional bool field11997 = 6;
+  repeated string field11998 = 7;
+  optional float field11999 = 8;
+  repeated .benchmarks.google_message4.UnusedEnum field12000 = 9;
+  optional int32 field12001 = 11;
+}
+
+message Message7287 {
+  optional .benchmarks.google_message4.Message6133 field7311 = 1;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7312 = 8;
+  optional string field7313 = 3;
+  optional .benchmarks.google_message4.Message6643 field7314 = 4;
+  optional .benchmarks.google_message4.Enum7288 field7315 = 5;
+  optional bytes field7316 = 6;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7317 = 7;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7318 = 9;
+}
+
+message Message3061 {
+  optional string field3286 = 2;
+  optional int32 field3287 = 77;
+  optional string field3288 = 49;
+  required .benchmarks.google_message4.Message3046 field3289 = 3;
+  optional .benchmarks.google_message4.Message3046 field3290 = 58;
+  optional group Message3062 = 4 {
+    required int32 field3335 = 5;
+    optional int32 field3336 = 6;
+    optional int32 field3337 = 7;
+  }
+  optional .benchmarks.google_message4.Message3060 field3292 = 104;
+  optional int64 field3293 = 32;
+  optional int32 field3294 = 41;
+  optional group Message3063 = 13 {
+    required int32 field3338 = 14;
+    optional .benchmarks.google_message4.Enum2851 field3339 = 18;
+    optional int64 field3340 = 15;
+    optional int64 field3341 = 23;
+  }
+  optional .benchmarks.google_message4.Enum2834 field3296 = 94;
+  optional bool field3297 = 25;
+  optional bool field3298 = 50;
+  optional string field3299 = 89;
+  optional string field3300 = 91;
+  optional string field3301 = 105;
+  optional .benchmarks.google_message4.Message3050 field3302 = 53;
+  optional fixed64 field3303 = 51;
+  optional fixed64 field3304 = 106;
+  optional int32 field3305 = 60;
+  optional string field3306 = 44;
+  optional bytes field3307 = 81;
+  optional string field3308 = 70;
+  optional bytes field3309 = 45;
+  optional .benchmarks.google_message4.Enum2806 field3310 = 71;
+  optional int32 field3311 = 72;
+  optional bytes field3312 = 78;
+  optional int32 field3313 = 20;
+  repeated group Message3064 = 8 {
+    required .benchmarks.google_message4.Enum2602 field3342 = 9;
+    optional int32 field3343 = 92;
+    optional string field3344 = 10;
+    optional bytes field3345 = 11;
+    optional int32 field3346 = 12;
+    optional .benchmarks.google_message4.Message3060 field3347 = 98;
+    optional .benchmarks.google_message4.UnusedEmptyMessage field3348 = 82;
+    optional .benchmarks.google_message4.Message3050 field3349 = 80;
+    optional fixed64 field3350 = 52;
+    optional int32 field3351 = 33;
+    optional string field3352 = 42;
+    optional string field3353 = 69;
+    optional bytes field3354 = 43;
+    optional .benchmarks.google_message4.Enum2806 field3355 = 73;
+    optional int32 field3356 = 74;
+    optional int32 field3357 = 90;
+    optional bytes field3358 = 79;
+    optional int32 field3359 = 19;
+    optional .benchmarks.google_message4.Enum2834 field3360 = 95;
+  }
+  optional .benchmarks.google_message4.UnusedEmptyMessage field3315 = 39;
+  optional int32 field3316 = 76;
+  optional group Message3065 = 63 {
+  }
+  optional .benchmarks.google_message4.Enum2806 field3318 = 54;
+  optional int32 field3319 = 46;
+  repeated string field3320 = 24;
+  optional fixed32 field3321 = 38;
+  optional bytes field3322 = 99;
+  optional fixed64 field3323 = 1;
+  optional fixed64 field3324 = 97;
+  repeated .benchmarks.google_message4.Message3040 field3325 = 16;
+  repeated .benchmarks.google_message4.Message3041 field3326 = 61;
+  optional group Message3066 = 21 {
+    optional int32 field3366 = 22;
+    optional int32 field3367 = 55;
+    optional int32 field3368 = 88;
+    optional int32 field3369 = 56;
+    optional int32 field3370 = 75;
+    optional int32 field3371 = 57;
+    optional .benchmarks.google_message4.UnusedEmptyMessage field3372 = 85;
+    optional .benchmarks.google_message4.UnusedEmptyMessage field3373 = 96;
+  }
+  optional .benchmarks.google_message4.UnusedEmptyMessage field3328 = 47;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field3329 = 48;
+  optional fixed64 field3330 = 40;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field3331 = 86;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field3332 = 59;
+  optional int32 field3333 = 17;
+}
+
+message Message12949 {
+}
+
+message Message8572 {
+  optional bytes field8647 = 1;
+  optional bytes field8648 = 3;
+  optional .benchmarks.google_message4.Message3886 field8649 = 4;
+  optional .benchmarks.google_message4.Message3919 field8650 = 57;
+  optional bool field8651 = 5;
+  optional int32 field8652 = 6;
+  optional int32 field8653 = 49;
+  optional .benchmarks.google_message4.Message7905 field8654 = 7;
+  optional int32 field8655 = 10;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8656 = 11;
+  optional bool field8657 = 35;
+  optional bytes field8658 = 12;
+  optional string field8659 = 14;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8660 = 13;
+  optional bytes field8661 = 15;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8662 = 17;
+  optional int32 field8663 = 18;
+  optional int32 field8664 = 19;
+  optional bool field8665 = 20;
+  optional .benchmarks.google_message4.Enum3476 field8666 = 31;
+  optional bool field8667 = 36;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8668 = 39;
+  optional bytes field8669 = 22;
+  optional int32 field8670 = 24;
+  optional .benchmarks.google_message4.Message3052 field8671 = 25;
+  optional bytes field8672 = 26;
+  optional bytes field8673 = 28;
+  optional int32 field8674 = 29;
+  optional bytes field8675 = 30;
+  optional bytes field8676 = 32;
+  optional string field8677 = 33;
+  optional int32 field8678 = 34;
+  optional int32 field8679 = 37;
+  optional double field8680 = 38;
+  optional double field8681 = 42;
+  optional .benchmarks.google_message4.Message3922 field8682 = 40;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8683 = 43;
+  optional int64 field8684 = 44;
+  optional .benchmarks.google_message4.Message7929 field8685 = 45;
+  optional uint64 field8686 = 46;
+  optional uint32 field8687 = 48;
+  optional .benchmarks.google_message4.Message7843 field8688 = 47;
+  optional .benchmarks.google_message4.Message7864 field8689 = 50;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8690 = 52;
+  optional bool field8691 = 58;
+  optional bool field8692 = 54;
+  optional string field8693 = 55;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8694 = 41;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field8695 = 53;
+  optional .benchmarks.google_message4.Message8575 field8696 = 61;
+}
+
+message Message8774 {
+  optional string field8810 = 1;
+  optional string field8811 = 2;
+  optional string field8812 = 3;
+  optional string field8813 = 4;
+  optional string field8814 = 5;
+}
+
+message Message12776 {
+  optional string field12786 = 1;
+  optional fixed64 field12787 = 11;
+  optional int32 field12788 = 6;
+  optional int32 field12789 = 13;
+  optional int32 field12790 = 14;
+  optional int32 field12791 = 15;
+  optional int32 field12792 = 16;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12793 = 8;
+  optional .benchmarks.google_message4.Message12774 field12794 = 10;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field12795 = 12;
+  extensions 2 to 2;
+  extensions 3 to 3;
+  extensions 4 to 4;
+  extensions 5 to 5;
+  extensions 7 to 7;
+  extensions 9 to 9;
+}
+
+message Message12798 {
+  optional int32 field12805 = 1;
+  optional int32 field12806 = 2;
+  optional .benchmarks.google_message4.Message12774 field12807 = 6;
+  optional bool field12808 = 7;
+}
+
+message Message12797 {
+  optional .benchmarks.google_message4.Message12796 field12802 = 1;
+  repeated .benchmarks.google_message4.Message12796 field12803 = 2;
+  optional string field12804 = 3;
+}
+
+message Message12825 {
+  repeated .benchmarks.google_message4.Message12818 field12862 = 1;
+  optional int32 field12863 = 2;
+  optional .benchmarks.google_message4.Message12819 field12864 = 3;
+  optional .benchmarks.google_message4.Message12820 field12865 = 4;
+  optional int32 field12866 = 5;
+  repeated .benchmarks.google_message4.Message12821 field12867 = 6;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field12868 = 7;
+}
+
+message Message8590 {
+}
+
+message Message8587 {
+}
+
+message Message1374 {
+  required string field1375 = 1;
+  optional string field1376 = 2;
+}
+
+message Message2462 {
+  required bytes field2496 = 1;
+  required double field2497 = 2;
+}
+
+message Message12685 {
+  repeated string field12692 = 1;
+  repeated string field12693 = 2;
+  optional int64 field12694 = 3;
+  optional uint32 field12695 = 4;
+  repeated string field12696 = 5;
+  optional string field12697 = 6;
+  optional string field12698 = 7;
+}
+
+message Message10320 {
+  optional .benchmarks.google_message4.Enum10335 field10347 = 1;
+  repeated .benchmarks.google_message4.Message10319 field10348 = 2;
+  optional int32 field10349 = 3;
+  optional int32 field10350 = 4;
+  optional int32 field10351 = 5;
+  optional int32 field10352 = 6;
+  optional .benchmarks.google_message4.Enum10337 field10353 = 7;
+}
+
+message Message11947 {
+  optional uint32 field11951 = 1;
+  optional bool field11952 = 2;
+  optional int32 field11953 = 3;
+}
+
+message Message11920 {
+  optional .benchmarks.google_message4.Enum11901 field11945 = 1;
+  optional .benchmarks.google_message4.UnusedEnum field11946 = 2;
+}
+
+message Message6643 {
+  optional .benchmarks.google_message4.UnusedEmptyMessage field6683 = 3;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field6684 = 4;
+  optional double field6685 = 5;
+  optional double field6686 = 6;
+  optional int32 field6687 = 1;
+  optional int32 field6688 = 2;
+  optional double field6689 = 9;
+  optional bytes field6690 = 10;
+  optional int32 field6691 = 11;
+  optional bool field6692 = 12;
+  optional bool field6693 = 13;
+  optional .benchmarks.google_message4.Message6578 field6694 = 15;
+  optional .benchmarks.google_message4.UnusedEnum field6695 = 16;
+  optional int64 field6696 = 17;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field6697 = 22;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field6698 = 19;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field6699 = 20;
+  optional int32 field6700 = 21;
+}
+
+message Message6133 {
+  optional .benchmarks.google_message4.Message4016 field6173 = 12;
+  optional double field6174 = 16;
+  required string field6175 = 1;
+  required string field6176 = 2;
+  required string field6177 = 3;
+  optional string field6178 = 4;
+  optional string field6179 = 8;
+  repeated .benchmarks.google_message4.Message6109 field6180 = 5;
+  repeated .benchmarks.google_message4.Message5908 field6181 = 13;
+  repeated .benchmarks.google_message4.Message6107 field6182 = 7;
+  repeated .benchmarks.google_message4.Message6126 field6183 = 9;
+  repeated .benchmarks.google_message4.Message6129 field6184 = 15;
+  optional int32 field6185 = 10;
+  optional int32 field6186 = 11;
+  optional .benchmarks.google_message4.Message4016 field6187 = 17;
+  optional double field6188 = 14;
+  optional double field6189 = 18;
+  optional string field6190 = 19;
+  optional string field6191 = 20;
+  repeated .benchmarks.google_message4.Message5881 field6192 = 21;
+}
+
+message Message6109 {
+  optional string field6140 = 1;
+  required .benchmarks.google_message4.Enum6111 field6141 = 2;
+  optional int32 field6142 = 9;
+  optional string field6143 = 3;
+  repeated .benchmarks.google_message4.Message6110 field6144 = 4;
+  repeated int32 field6145 = 7;
+  repeated int32 field6146 = 8;
+  optional .benchmarks.google_message4.Message6133 field6147 = 10;
+  repeated int32 field6148 = 11;
+  optional string field6149 = 12;
+  optional string field6150 = 13;
+  optional bool field6151 = 14;
+  extensions 1000 to 536870911;
+}
+
+message Message3046 {
+  required .benchmarks.google_message4.Enum2593 field3222 = 1;
+  optional int32 field3223 = 4;
+}
+
+message Message3060 {
+  optional int64 field3283 = 1;
+  optional int64 field3284 = 2;
+  optional int64 field3285 = 3;
+}
+
+message Message3041 {
+  optional string field3214 = 1;
+  optional int32 field3215 = 2;
+}
+
+message Message3040 {
+  required fixed64 field3209 = 1;
+  repeated fixed64 field3210 = 4;
+  optional int32 field3211 = 5;
+  optional fixed64 field3212 = 2;
+  required string field3213 = 3;
+}
+
+message Message3050 {
+  optional bytes field3245 = 5;
+  optional int32 field3246 = 2;
+  optional bytes field3247 = 6;
+  optional int32 field3248 = 4;
+  optional fixed32 field3249 = 1;
+  optional fixed32 field3250 = 3;
+}
+
+message Message7905 {
+  optional int32 field7911 = 1;
+  optional bool field7912 = 2;
+  optional bytes field7913 = 3;
+  optional int32 field7914 = 4;
+  optional int32 field7915 = 5;
+  optional bytes field7916 = 6;
+  optional int32 field7917 = 7;
+}
+
+message Message3886 {
+  repeated group Message3887 = 1 {
+    required string field3932 = 2;
+    optional string field3933 = 9;
+    optional .benchmarks.google_message4.Message3850 field3934 = 3;
+    optional bytes field3935 = 8;
+  }
+}
+
+message Message7864 {
+  optional string field7866 = 1;
+  optional string field7867 = 2;
+  repeated .benchmarks.google_message4.Message7865 field7868 = 5;
+  repeated .benchmarks.google_message4.Message7865 field7869 = 6;
+  repeated .benchmarks.google_message4.Message7865 field7870 = 7;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field7871 = 8;
+}
+
+message Message3922 {
+  optional uint64 field4012 = 1;
+}
+
+message Message3052 {
+  repeated string field3254 = 1;
+  repeated string field3255 = 2;
+  repeated bytes field3256 = 3;
+  repeated string field3257 = 4;
+  optional bool field3258 = 5;
+  optional int32 field3259 = 6;
+  optional int32 field3260 = 7;
+  optional string field3261 = 8;
+  optional string field3262 = 9;
+}
+
+message Message8575 {
+}
+
+message Message7843 {
+  optional bool field7844 = 5;
+  optional int32 field7845 = 1;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7846 = 22;
+  repeated int32 field7847 = 3;
+  repeated string field7848 = 11;
+  optional .benchmarks.google_message4.UnusedEnum field7849 = 15;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7850 = 6;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7851 = 14;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7852 = 10;
+  optional .benchmarks.google_message4.Message7511 field7853 = 13;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7854 = 16;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7855 = 17;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7856 = 19;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field7857 = 18;
+  optional .benchmarks.google_message4.UnusedEnum field7858 = 20;
+  optional int32 field7859 = 2;
+}
+
+message Message3919 {
+  repeated .benchmarks.google_message4.Message3920 field4009 = 1;
+}
+
+message Message7929 {
+  optional int64 field7942 = 1;
+  optional int64 field7943 = 4;
+  optional int64 field7944 = 5;
+  optional int64 field7945 = 12;
+  optional int64 field7946 = 13;
+  optional int64 field7947 = 18;
+  optional int64 field7948 = 6;
+  optional int64 field7949 = 7;
+  repeated .benchmarks.google_message4.Message7919 field7950 = 8;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field7951 = 20;
+  repeated .benchmarks.google_message4.Message7920 field7952 = 14;
+  repeated .benchmarks.google_message4.Message7921 field7953 = 15;
+  repeated .benchmarks.google_message4.Message7928 field7954 = 17;
+  optional int64 field7955 = 19;
+  optional bool field7956 = 2;
+  optional int64 field7957 = 3;
+  optional int64 field7958 = 9;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field7959 = 10;
+  repeated bytes field7960 = 11;
+  optional int64 field7961 = 16;
+}
+
diff --git a/benchmarks/datasets/google_message4/benchmark_message4_2.proto b/benchmarks/datasets/google_message4/benchmark_message4_2.proto
new file mode 100644
index 00000000..d5e9da5a
--- /dev/null
+++ b/benchmarks/datasets/google_message4/benchmark_message4_2.proto
@@ -0,0 +1,292 @@
+syntax = "proto2";
+
+import "datasets/google_message4/benchmark_message4_3.proto";
+package benchmarks.google_message4;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+message Message12774 {
+  optional uint32 field12777 = 1;
+  optional uint32 field12778 = 2;
+  optional uint32 field12779 = 3;
+  optional uint32 field12780 = 4;
+  optional uint32 field12781 = 5;
+  optional bool field12782 = 6;
+}
+
+message Message12796 {
+  repeated fixed64 field12800 = 1;
+  optional uint64 field12801 = 2;
+}
+
+message Message12821 {
+  optional int32 field12848 = 1;
+  optional int32 field12849 = 2;
+  optional int32 field12850 = 3;
+  optional int32 field12851 = 4;
+  optional int32 field12852 = 5;
+}
+
+message Message12820 {
+  optional int32 field12840 = 1;
+  optional int32 field12841 = 2;
+  optional int32 field12842 = 3;
+  optional int32 field12843 = 8;
+  optional int32 field12844 = 4;
+  optional int32 field12845 = 5;
+  optional int32 field12846 = 6;
+  optional int32 field12847 = 7;
+}
+
+message Message12819 {
+  optional double field12834 = 1;
+  optional double field12835 = 2;
+  optional double field12836 = 3;
+  optional double field12837 = 4;
+  optional double field12838 = 5;
+  optional double field12839 = 6;
+}
+
+message Message12818 {
+  optional uint64 field12829 = 1;
+  optional int32 field12830 = 2;
+  optional int32 field12831 = 3;
+  optional int32 field12832 = 5;
+  repeated .benchmarks.google_message4.Message12817 field12833 = 4;
+}
+
+message Message10319 {
+  optional .benchmarks.google_message4.Enum10325 field10340 = 1;
+  optional int32 field10341 = 4;
+  optional int32 field10342 = 5;
+  optional bytes field10343 = 3;
+  optional string field10344 = 2;
+  optional string field10345 = 6;
+  optional string field10346 = 7;
+}
+
+message Message6578 {
+  optional .benchmarks.google_message4.Enum6579 field6632 = 1;
+  optional .benchmarks.google_message4.Enum6588 field6633 = 2;
+}
+
+message Message6126 {
+  required string field6152 = 1;
+  repeated .benchmarks.google_message4.Message6127 field6153 = 9;
+  optional int32 field6154 = 14;
+  optional bytes field6155 = 10;
+  optional .benchmarks.google_message4.Message6024 field6156 = 12;
+  optional int32 field6157 = 4;
+  optional string field6158 = 5;
+  optional int32 field6159 = 6;
+  repeated int32 field6160 = 2;
+  repeated int32 field6161 = 3;
+  repeated .benchmarks.google_message4.Message6052 field6162 = 7;
+  repeated .benchmarks.google_message4.UnusedEmptyMessage field6163 = 11;
+  optional .benchmarks.google_message4.Enum6065 field6164 = 15;
+  repeated .benchmarks.google_message4.Message6127 field6165 = 8;
+  optional bool field6166 = 13;
+  optional bool field6167 = 16;
+  optional bool field6168 = 18;
+  repeated .benchmarks.google_message4.Message6054 field6169 = 17;
+  optional int32 field6170 = 19;
+}
+
+message Message5881 {
+  required double field5897 = 1;
+  optional string field5898 = 5;
+  optional .benchmarks.google_message4.Message5861 field5899 = 2;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field5900 = 3;
+  optional .benchmarks.google_message4.Message5867 field5901 = 4;
+  optional .benchmarks.google_message4.Message5880 field5902 = 6;
+}
+
+message Message6110 {
+}
+
+message Message6107 {
+  optional .benchmarks.google_message4.Message4016 field6134 = 1;
+  optional int32 field6135 = 2;
+  optional string field6136 = 3;
+  repeated int32 field6137 = 4;
+  optional int32 field6138 = 5;
+  repeated .benchmarks.google_message4.Message6108 field6139 = 6;
+}
+
+message Message6129 {
+  required .benchmarks.google_message4.Enum6130 field6171 = 1;
+  required string field6172 = 2;
+}
+
+message Message5908 {
+  optional string field5971 = 1;
+  optional int32 field5972 = 2;
+  optional int32 field5973 = 3;
+  optional .benchmarks.google_message4.Enum5909 field5974 = 45;
+  optional .benchmarks.google_message4.Enum5912 field5975 = 4;
+  optional fixed32 field5976 = 50;
+  optional fixed32 field5977 = 5;
+  optional fixed32 field5978 = 6;
+  optional string field5979 = 7;
+  optional .benchmarks.google_message4.Enum5915 field5980 = 8;
+  optional .benchmarks.google_message4.Message5903 field5981 = 9;
+  optional .benchmarks.google_message4.Message5903 field5982 = 10;
+  optional .benchmarks.google_message4.Enum5920 field5983 = 11;
+  optional .benchmarks.google_message4.Enum5923 field5984 = 40;
+  optional .benchmarks.google_message4.Message5903 field5985 = 41;
+  optional .benchmarks.google_message4.Message5903 field5986 = 42;
+  optional .benchmarks.google_message4.Enum5928 field5987 = 47;
+  optional bool field5988 = 48;
+  repeated fixed32 field5989 = 49;
+  optional string field5990 = 12;
+  optional .benchmarks.google_message4.Message5903 field5991 = 13;
+  optional .benchmarks.google_message4.Message5903 field5992 = 14;
+  optional .benchmarks.google_message4.Message5903 field5993 = 15;
+  optional .benchmarks.google_message4.Message5903 field5994 = 16;
+  optional .benchmarks.google_message4.Message5903 field5995 = 32;
+  optional .benchmarks.google_message4.Message5903 field5996 = 33;
+  optional .benchmarks.google_message4.Message5903 field5997 = 34;
+  optional .benchmarks.google_message4.Message5903 field5998 = 35;
+  optional .benchmarks.google_message4.Enum5931 field5999 = 17;
+  optional .benchmarks.google_message4.Enum5935 field6000 = 18;
+  optional .benchmarks.google_message4.Enum5939 field6001 = 36;
+  optional .benchmarks.google_message4.Enum5939 field6002 = 37;
+  repeated int32 field6003 = 19;
+  optional uint32 field6004 = 20;
+  optional uint32 field6005 = 21;
+  optional uint32 field6006 = 22;
+  optional uint32 field6007 = 23;
+  optional .benchmarks.google_message4.Enum5946 field6008 = 24;
+  optional .benchmarks.google_message4.Enum5946 field6009 = 25;
+  optional .benchmarks.google_message4.Enum5946 field6010 = 26;
+  optional .benchmarks.google_message4.Enum5946 field6011 = 27;
+  optional fixed32 field6012 = 28;
+  optional fixed32 field6013 = 29;
+  optional fixed32 field6014 = 30;
+  optional fixed32 field6015 = 31;
+  optional int32 field6016 = 38;
+  optional float field6017 = 39;
+  optional .benchmarks.google_message4.Enum5957 field6018 = 43;
+  optional .benchmarks.google_message4.Message5907 field6019 = 44;
+  optional .benchmarks.google_message4.Enum5962 field6020 = 46;
+}
+
+message Message3850 {
+  optional .benchmarks.google_message4.Enum3851 field3924 = 2;
+  optional bool field3925 = 12;
+  optional int32 field3926 = 4;
+  optional bool field3927 = 10;
+  optional bool field3928 = 13;
+  optional bool field3929 = 14;
+}
+
+message Message7865 {
+}
+
+message Message7511 {
+  optional bool field7523 = 1;
+  optional .benchmarks.google_message4.Enum7512 field7524 = 2;
+  optional int32 field7525 = 3;
+  optional int32 field7526 = 4;
+  optional bool field7527 = 5;
+  optional int32 field7528 = 6;
+  optional int32 field7529 = 7;
+}
+
+message Message3920 {
+}
+
+message Message7928 {
+  optional string field7940 = 1;
+  optional int64 field7941 = 2;
+}
+
+message Message7921 {
+  optional int32 field7936 = 1;
+  optional int64 field7937 = 2;
+  optional float field7938 = 3;
+  optional .benchmarks.google_message4.Enum7922 field7939 = 4;
+}
+
+message Message7920 {
+  optional int64 field7934 = 1;
+  optional int64 field7935 = 2;
+}
+
+message Message7919 {
+  optional fixed64 field7931 = 1;
+  optional int64 field7932 = 2;
+  optional bytes field7933 = 3;
+}
+
+message Message12817 {
+  optional int32 field12826 = 1;
+  optional int32 field12827 = 2;
+  optional int32 field12828 = 3;
+}
+
+message Message6054 {
+  required string field6089 = 1;
+  optional string field6090 = 2;
+}
+
+message Message6127 {
+}
+
+message Message6052 {
+  required string field6084 = 1;
+  required bytes field6085 = 2;
+}
+
+message Message6024 {
+  optional .benchmarks.google_message4.Enum6025 field6048 = 1;
+  optional string field6049 = 2;
+  optional .benchmarks.google_message4.UnusedEmptyMessage field6050 = 3;
+}
+
+message Message5861 {
+  required .benchmarks.google_message4.Enum5862 field5882 = 1;
+  required string field5883 = 2;
+  optional bool field5884 = 3;
+  optional string field5885 = 4;
+}
+
+message Message5880 {
+  optional string field5896 = 1;
+}
+
+message Message5867 {
+  optional .benchmarks.google_message4.Enum5868 field5890 = 1;
+  optional string field5891 = 2;
+  optional .benchmarks.google_message4.Enum5873 field5892 = 3;
+  optional int32 field5893 = 4;
+  optional .benchmarks.google_message4.UnusedEnum field5894 = 5;
+  optional bool field5895 = 6;
+}
+
+message Message4016 {
+  required int32 field4017 = 1;
+  required int32 field4018 = 2;
+  required int32 field4019 = 3;
+  required int32 field4020 = 4;
+}
+
+message Message6108 {
+}
+
+message Message5907 {
+  optional .benchmarks.google_message4.Message5903 field5967 = 1;
+  optional .benchmarks.google_message4.Message5903 field5968 = 2;
+  optional .benchmarks.google_message4.Message5903 field5969 = 3;
+  optional .benchmarks.google_message4.Message5903 field5970 = 4;
+}
+
+message UnusedEmptyMessage {
+}
+
+message Message5903 {
+  required int32 field5965 = 1;
+  optional .benchmarks.google_message4.Enum5904 field5966 = 2;
+}
+
diff --git a/benchmarks/datasets/google_message4/benchmark_message4_3.proto b/benchmarks/datasets/google_message4/benchmark_message4_3.proto
new file mode 100644
index 00000000..544fad20
--- /dev/null
+++ b/benchmarks/datasets/google_message4/benchmark_message4_3.proto
@@ -0,0 +1,751 @@
+syntax = "proto2";
+
+package benchmarks.google_message4;
+
+option cc_enable_arenas = true;
+option java_package = "com.google.protobuf.benchmarks";
+
+enum UnusedEnum {
+  UNUSED_ENUM_VALUE1 = 0;
+  UNUSED_ENUM_VALUE2 = 1;
+}
+
+enum Enum2593 {
+  ENUM_VALUE2594 = 0;
+  ENUM_VALUE2595 = 1;
+  ENUM_VALUE2596 = 2;
+  ENUM_VALUE2597 = 3;
+  ENUM_VALUE2598 = 4;
+  ENUM_VALUE2599 = 5;
+  ENUM_VALUE2600 = 6;
+  ENUM_VALUE2601 = 7;
+}
+
+enum Enum2834 {
+  ENUM_VALUE2835 = 0;
+  ENUM_VALUE2836 = 1;
+  ENUM_VALUE2837 = 2;
+}
+
+enum Enum2806 {
+  ENUM_VALUE2807 = 0;
+  ENUM_VALUE2808 = 1;
+  ENUM_VALUE2809 = 2;
+  ENUM_VALUE2810 = 3;
+  ENUM_VALUE2811 = 4;
+  ENUM_VALUE2812 = 5;
+  ENUM_VALUE2813 = 6;
+  ENUM_VALUE2814 = 7;
+  ENUM_VALUE2815 = 8;
+  ENUM_VALUE2816 = 9;
+  ENUM_VALUE2817 = 10;
+  ENUM_VALUE2818 = 11;
+  ENUM_VALUE2819 = 12;
+  ENUM_VALUE2820 = 13;
+  ENUM_VALUE2821 = 14;
+}
+
+enum Enum2851 {
+  option allow_alias = true;
+  ENUM_VALUE2852 = 0;
+  ENUM_VALUE2853 = 0;
+  ENUM_VALUE2854 = 1;
+  ENUM_VALUE2855 = 2;
+  ENUM_VALUE2856 = 3;
+  ENUM_VALUE2857 = 4;
+  ENUM_VALUE2858 = 5;
+  ENUM_VALUE2859 = 6;
+  ENUM_VALUE2860 = 7;
+  ENUM_VALUE2861 = 8;
+  ENUM_VALUE2862 = 9;
+  ENUM_VALUE2863 = 10;
+  ENUM_VALUE2864 = 11;
+  ENUM_VALUE2865 = 12;
+  ENUM_VALUE2866 = 13;
+  ENUM_VALUE2867 = 14;
+  ENUM_VALUE2868 = 15;
+  ENUM_VALUE2869 = 16;
+  ENUM_VALUE2870 = 17;
+  ENUM_VALUE2871 = 18;
+  ENUM_VALUE2872 = 19;
+  ENUM_VALUE2873 = 20;
+  ENUM_VALUE2874 = 21;
+  ENUM_VALUE2875 = 22;
+  ENUM_VALUE2876 = 23;
+  ENUM_VALUE2877 = 24;
+  ENUM_VALUE2878 = 25;
+  ENUM_VALUE2879 = 26;
+  ENUM_VALUE2880 = 27;
+  ENUM_VALUE2881 = 28;
+  ENUM_VALUE2882 = 29;
+  ENUM_VALUE2883 = 30;
+  ENUM_VALUE2884 = 31;
+  ENUM_VALUE2885 = 32;
+  ENUM_VALUE2886 = 33;
+  ENUM_VALUE2887 = 34;
+  ENUM_VALUE2888 = 35;
+  ENUM_VALUE2889 = 36;
+  ENUM_VALUE2890 = 37;
+  ENUM_VALUE2891 = 38;
+  ENUM_VALUE2892 = 39;
+  ENUM_VALUE2893 = 40;
+  ENUM_VALUE2894 = 41;
+  ENUM_VALUE2895 = 42;
+  ENUM_VALUE2896 = 43;
+  ENUM_VALUE2897 = 44;
+  ENUM_VALUE2898 = 45;
+  ENUM_VALUE2899 = 46;
+  ENUM_VALUE2900 = 47;
+  ENUM_VALUE2901 = 48;
+  ENUM_VALUE2902 = 49;
+  ENUM_VALUE2903 = 50;
+  ENUM_VALUE2904 = 51;
+  ENUM_VALUE2905 = 52;
+  ENUM_VALUE2906 = 53;
+  ENUM_VALUE2907 = 54;
+  ENUM_VALUE2908 = 55;
+  ENUM_VALUE2909 = 56;
+  ENUM_VALUE2910 = 57;
+  ENUM_VALUE2911 = 58;
+  ENUM_VALUE2912 = 59;
+  ENUM_VALUE2913 = 60;
+  ENUM_VALUE2914 = 61;
+  ENUM_VALUE2915 = 62;
+  ENUM_VALUE2916 = 63;
+  ENUM_VALUE2917 = 64;
+  ENUM_VALUE2918 = 65;
+  ENUM_VALUE2919 = 66;
+  ENUM_VALUE2920 = 67;
+  ENUM_VALUE2921 = 68;
+  ENUM_VALUE2922 = 69;
+  ENUM_VALUE2923 = 70;
+  ENUM_VALUE2924 = 71;
+  ENUM_VALUE2925 = 72;
+  ENUM_VALUE2926 = 73;
+  ENUM_VALUE2927 = 74;
+  ENUM_VALUE2928 = 75;
+  ENUM_VALUE2929 = 76;
+  ENUM_VALUE2930 = 77;
+  ENUM_VALUE2931 = 78;
+  ENUM_VALUE2932 = 79;
+  ENUM_VALUE2933 = 80;
+  ENUM_VALUE2934 = 81;
+  ENUM_VALUE2935 = 82;
+  ENUM_VALUE2936 = 83;
+  ENUM_VALUE2937 = 84;
+  ENUM_VALUE2938 = 85;
+  ENUM_VALUE2939 = 86;
+  ENUM_VALUE2940 = 87;
+  ENUM_VALUE2941 = 88;
+  ENUM_VALUE2942 = 89;
+  ENUM_VALUE2943 = 90;
+  ENUM_VALUE2944 = 91;
+  ENUM_VALUE2945 = 92;
+  ENUM_VALUE2946 = 93;
+  ENUM_VALUE2947 = 94;
+  ENUM_VALUE2948 = 95;
+  ENUM_VALUE2949 = 96;
+  ENUM_VALUE2950 = 97;
+  ENUM_VALUE2951 = 98;
+  ENUM_VALUE2952 = 99;
+  ENUM_VALUE2953 = 100;
+  ENUM_VALUE2954 = 101;
+  ENUM_VALUE2955 = 102;
+  ENUM_VALUE2956 = 103;
+  ENUM_VALUE2957 = 104;
+  ENUM_VALUE2958 = 105;
+  ENUM_VALUE2959 = 106;
+  ENUM_VALUE2960 = 107;
+  ENUM_VALUE2961 = 108;
+  ENUM_VALUE2962 = 109;
+  ENUM_VALUE2963 = 110;
+  ENUM_VALUE2964 = 111;
+  ENUM_VALUE2965 = 112;
+  ENUM_VALUE2966 = 113;
+  ENUM_VALUE2967 = 114;
+  ENUM_VALUE2968 = 115;
+  ENUM_VALUE2969 = 116;
+  ENUM_VALUE2970 = 117;
+  ENUM_VALUE2971 = 118;
+  ENUM_VALUE2972 = 119;
+}
+
+enum Enum2602 {
+  ENUM_VALUE2603 = 0;
+  ENUM_VALUE2604 = 1;
+  ENUM_VALUE2605 = 2;
+  ENUM_VALUE2606 = 3;
+  ENUM_VALUE2607 = 4;
+  ENUM_VALUE2608 = 5;
+  ENUM_VALUE2609 = 6;
+  ENUM_VALUE2610 = 7;
+  ENUM_VALUE2611 = 8;
+  ENUM_VALUE2612 = 9;
+  ENUM_VALUE2613 = 10;
+  ENUM_VALUE2614 = 11;
+}
+
+enum Enum3071 {
+  ENUM_VALUE3072 = 1;
+  ENUM_VALUE3073 = 2;
+  ENUM_VALUE3074 = 3;
+  ENUM_VALUE3075 = 4;
+  ENUM_VALUE3076 = 5;
+  ENUM_VALUE3077 = 6;
+  ENUM_VALUE3078 = 7;
+  ENUM_VALUE3079 = 8;
+  ENUM_VALUE3080 = 9;
+  ENUM_VALUE3081 = 10;
+  ENUM_VALUE3082 = 11;
+  ENUM_VALUE3083 = 12;
+  ENUM_VALUE3084 = 13;
+  ENUM_VALUE3085 = 14;
+  ENUM_VALUE3086 = 15;
+  ENUM_VALUE3087 = 16;
+  ENUM_VALUE3088 = 17;
+  ENUM_VALUE3089 = 18;
+  ENUM_VALUE3090 = 19;
+  ENUM_VALUE3091 = 20;
+  ENUM_VALUE3092 = 21;
+  ENUM_VALUE3093 = 22;
+  ENUM_VALUE3094 = 23;
+  ENUM_VALUE3095 = 24;
+  ENUM_VALUE3096 = 25;
+  ENUM_VALUE3097 = 26;
+  ENUM_VALUE3098 = 27;
+  ENUM_VALUE3099 = 28;
+}
+
+enum Enum3805 {
+  ENUM_VALUE3806 = 0;
+  ENUM_VALUE3807 = 1;
+  ENUM_VALUE3808 = 2;
+  ENUM_VALUE3809 = 3;
+  ENUM_VALUE3810 = 4;
+  ENUM_VALUE3811 = 5;
+  ENUM_VALUE3812 = 6;
+  ENUM_VALUE3813 = 7;
+  ENUM_VALUE3814 = 8;
+  ENUM_VALUE3815 = 9;
+  ENUM_VALUE3816 = 11;
+  ENUM_VALUE3817 = 10;
+}
+
+enum Enum3783 {
+  ENUM_VALUE3784 = 0;
+  ENUM_VALUE3785 = 1;
+  ENUM_VALUE3786 = 2;
+  ENUM_VALUE3787 = 3;
+  ENUM_VALUE3788 = 4;
+  ENUM_VALUE3789 = 5;
+  ENUM_VALUE3790 = 6;
+  ENUM_VALUE3791 = 7;
+  ENUM_VALUE3792 = 8;
+  ENUM_VALUE3793 = 9;
+  ENUM_VALUE3794 = 10;
+  ENUM_VALUE3795 = 11;
+  ENUM_VALUE3796 = 12;
+  ENUM_VALUE3797 = 13;
+  ENUM_VALUE3798 = 14;
+  ENUM_VALUE3799 = 15;
+  ENUM_VALUE3800 = 16;
+  ENUM_VALUE3801 = 20;
+  ENUM_VALUE3802 = 21;
+  ENUM_VALUE3803 = 50;
+}
+
+enum Enum3851 {
+  ENUM_VALUE3852 = 0;
+  ENUM_VALUE3853 = 1;
+  ENUM_VALUE3854 = 2;
+  ENUM_VALUE3855 = 3;
+  ENUM_VALUE3856 = 4;
+  ENUM_VALUE3857 = 5;
+  ENUM_VALUE3858 = 6;
+  ENUM_VALUE3859 = 7;
+  ENUM_VALUE3860 = 8;
+  ENUM_VALUE3861 = 9;
+  ENUM_VALUE3862 = 10;
+  ENUM_VALUE3863 = 11;
+  ENUM_VALUE3864 = 12;
+  ENUM_VALUE3865 = 13;
+  ENUM_VALUE3866 = 14;
+  ENUM_VALUE3867 = 15;
+  ENUM_VALUE3868 = 16;
+  ENUM_VALUE3869 = 17;
+}
+
+enum Enum5862 {
+  ENUM_VALUE5863 = 1;
+  ENUM_VALUE5864 = 2;
+  ENUM_VALUE5865 = 3;
+}
+
+enum Enum5868 {
+  ENUM_VALUE5869 = 0;
+  ENUM_VALUE5870 = 1;
+  ENUM_VALUE5871 = 2;
+  ENUM_VALUE5872 = 3;
+}
+
+enum Enum5873 {
+  ENUM_VALUE5874 = 0;
+  ENUM_VALUE5875 = 1;
+  ENUM_VALUE5876 = 2;
+}
+
+enum Enum5904 {
+  ENUM_VALUE5905 = 0;
+  ENUM_VALUE5906 = 1;
+}
+
+enum Enum5909 {
+  ENUM_VALUE5910 = 0;
+  ENUM_VALUE5911 = 1;
+}
+
+enum Enum5912 {
+  ENUM_VALUE5913 = 0;
+  ENUM_VALUE5914 = 1;
+}
+
+enum Enum5915 {
+  ENUM_VALUE5916 = 0;
+  ENUM_VALUE5917 = 1;
+  ENUM_VALUE5918 = 2;
+  ENUM_VALUE5919 = 3;
+}
+
+enum Enum5920 {
+  ENUM_VALUE5921 = 0;
+  ENUM_VALUE5922 = 1;
+}
+
+enum Enum5923 {
+  ENUM_VALUE5924 = 0;
+  ENUM_VALUE5925 = 1;
+  ENUM_VALUE5926 = 2;
+  ENUM_VALUE5927 = 3;
+}
+
+enum Enum5928 {
+  ENUM_VALUE5929 = 0;
+  ENUM_VALUE5930 = 1;
+}
+
+enum Enum5931 {
+  ENUM_VALUE5932 = 0;
+  ENUM_VALUE5933 = 1;
+  ENUM_VALUE5934 = 2;
+}
+
+enum Enum5935 {
+  ENUM_VALUE5936 = 0;
+  ENUM_VALUE5937 = 1;
+  ENUM_VALUE5938 = 2;
+}
+
+enum Enum5939 {
+  ENUM_VALUE5940 = 0;
+  ENUM_VALUE5941 = 1;
+  ENUM_VALUE5942 = 2;
+  ENUM_VALUE5943 = 3;
+  ENUM_VALUE5944 = 4;
+  ENUM_VALUE5945 = 5;
+}
+
+enum Enum5946 {
+  ENUM_VALUE5947 = 0;
+  ENUM_VALUE5948 = 1;
+  ENUM_VALUE5949 = 2;
+  ENUM_VALUE5950 = 3;
+  ENUM_VALUE5951 = 4;
+  ENUM_VALUE5952 = 5;
+  ENUM_VALUE5953 = 6;
+  ENUM_VALUE5954 = 7;
+  ENUM_VALUE5955 = 8;
+  ENUM_VALUE5956 = 9;
+}
+
+enum Enum5957 {
+  ENUM_VALUE5958 = 0;
+  ENUM_VALUE5959 = 1;
+  ENUM_VALUE5960 = 2;
+  ENUM_VALUE5961 = 3;
+}
+
+enum Enum5962 {
+  ENUM_VALUE5963 = 0;
+  ENUM_VALUE5964 = 1;
+}
+
+enum Enum6025 {
+  ENUM_VALUE6026 = 0;
+  ENUM_VALUE6027 = 1;
+  ENUM_VALUE6028 = 2;
+  ENUM_VALUE6029 = 3;
+  ENUM_VALUE6030 = 4;
+  ENUM_VALUE6031 = 5;
+  ENUM_VALUE6032 = 6;
+  ENUM_VALUE6033 = 7;
+  ENUM_VALUE6034 = 8;
+  ENUM_VALUE6035 = 9;
+  ENUM_VALUE6036 = 10;
+  ENUM_VALUE6037 = 11;
+  ENUM_VALUE6038 = 12;
+  ENUM_VALUE6039 = 13;
+  ENUM_VALUE6040 = 14;
+  ENUM_VALUE6041 = 15;
+  ENUM_VALUE6042 = 16;
+  ENUM_VALUE6043 = 17;
+  ENUM_VALUE6044 = 18;
+  ENUM_VALUE6045 = 19;
+  ENUM_VALUE6046 = 20;
+  ENUM_VALUE6047 = 21;
+}
+
+enum Enum6111 {
+  ENUM_VALUE6112 = 1;
+  ENUM_VALUE6113 = 2;
+  ENUM_VALUE6114 = 3;
+  ENUM_VALUE6115 = 4;
+  ENUM_VALUE6116 = 5;
+  ENUM_VALUE6117 = 6;
+  ENUM_VALUE6118 = 7;
+  ENUM_VALUE6119 = 8;
+  ENUM_VALUE6120 = 9;
+  ENUM_VALUE6121 = 10;
+  ENUM_VALUE6122 = 11;
+  ENUM_VALUE6123 = 12;
+  ENUM_VALUE6124 = 13;
+  ENUM_VALUE6125 = 14;
+}
+
+enum Enum6065 {
+  ENUM_VALUE6066 = 0;
+  ENUM_VALUE6067 = 1;
+  ENUM_VALUE6068 = 2;
+  ENUM_VALUE6069 = 3;
+  ENUM_VALUE6070 = 4;
+  ENUM_VALUE6071 = 5;
+  ENUM_VALUE6072 = 6;
+  ENUM_VALUE6073 = 7;
+  ENUM_VALUE6074 = 8;
+  ENUM_VALUE6075 = 9;
+  ENUM_VALUE6076 = 10;
+  ENUM_VALUE6077 = 11;
+  ENUM_VALUE6078 = 12;
+  ENUM_VALUE6079 = 13;
+  ENUM_VALUE6080 = 14;
+}
+
+enum Enum6130 {
+  ENUM_VALUE6131 = 0;
+  ENUM_VALUE6132 = 1;
+}
+
+enum Enum6579 {
+  ENUM_VALUE6580 = 0;
+  ENUM_VALUE6581 = 2;
+  ENUM_VALUE6582 = 3;
+  ENUM_VALUE6583 = 5;
+  ENUM_VALUE6584 = 10;
+  ENUM_VALUE6585 = 15;
+  ENUM_VALUE6586 = 25;
+  ENUM_VALUE6587 = 30;
+}
+
+enum Enum6588 {
+  ENUM_VALUE6589 = 0;
+  ENUM_VALUE6590 = 1;
+  ENUM_VALUE6591 = 2;
+  ENUM_VALUE6592 = 3;
+  ENUM_VALUE6593 = 4;
+  ENUM_VALUE6594 = 5;
+  ENUM_VALUE6595 = 6;
+  ENUM_VALUE6596 = 7;
+  ENUM_VALUE6597 = 8;
+  ENUM_VALUE6598 = 9;
+  ENUM_VALUE6599 = 10;
+  ENUM_VALUE6600 = 11;
+  ENUM_VALUE6601 = 12;
+  ENUM_VALUE6602 = 13;
+  ENUM_VALUE6603 = 14;
+  ENUM_VALUE6604 = 15;
+  ENUM_VALUE6605 = 16;
+  ENUM_VALUE6606 = 17;
+  ENUM_VALUE6607 = 19;
+  ENUM_VALUE6608 = 20;
+  ENUM_VALUE6609 = 21;
+  ENUM_VALUE6610 = 22;
+  ENUM_VALUE6611 = 23;
+  ENUM_VALUE6612 = 24;
+  ENUM_VALUE6613 = 25;
+  ENUM_VALUE6614 = 26;
+  ENUM_VALUE6615 = 27;
+  ENUM_VALUE6616 = 28;
+  ENUM_VALUE6617 = 29;
+  ENUM_VALUE6618 = 30;
+  ENUM_VALUE6619 = 31;
+  ENUM_VALUE6620 = 32;
+  ENUM_VALUE6621 = 33;
+  ENUM_VALUE6622 = 34;
+}
+
+enum Enum7288 {
+  ENUM_VALUE7289 = 0;
+  ENUM_VALUE7290 = 1;
+  ENUM_VALUE7291 = 2;
+  ENUM_VALUE7292 = 3;
+}
+
+enum Enum7512 {
+  ENUM_VALUE7513 = 0;
+  ENUM_VALUE7514 = 1;
+  ENUM_VALUE7515 = 2;
+  ENUM_VALUE7516 = 3;
+  ENUM_VALUE7517 = 4;
+  ENUM_VALUE7518 = 5;
+  ENUM_VALUE7519 = 6;
+  ENUM_VALUE7520 = 7;
+}
+
+enum Enum7922 {
+  ENUM_VALUE7923 = 1;
+  ENUM_VALUE7924 = 2;
+  ENUM_VALUE7925 = 3;
+  ENUM_VALUE7926 = 4;
+  ENUM_VALUE7927 = 5;
+}
+
+enum Enum3476 {
+  ENUM_VALUE3477 = 0;
+  ENUM_VALUE3478 = 1;
+  ENUM_VALUE3479 = 2;
+  ENUM_VALUE3480 = 3;
+  ENUM_VALUE3481 = 4;
+  ENUM_VALUE3482 = 5;
+  ENUM_VALUE3483 = 6;
+  ENUM_VALUE3484 = 7;
+  ENUM_VALUE3485 = 8;
+  ENUM_VALUE3486 = 9;
+  ENUM_VALUE3487 = 10;
+  ENUM_VALUE3488 = 11;
+  ENUM_VALUE3489 = 12;
+  ENUM_VALUE3490 = 13;
+  ENUM_VALUE3491 = 14;
+  ENUM_VALUE3492 = 15;
+  ENUM_VALUE3493 = 16;
+  ENUM_VALUE3494 = 17;
+  ENUM_VALUE3495 = 18;
+  ENUM_VALUE3496 = 19;
+  ENUM_VALUE3497 = 20;
+  ENUM_VALUE3498 = 21;
+  ENUM_VALUE3499 = 22;
+  ENUM_VALUE3500 = 23;
+  ENUM_VALUE3501 = 24;
+  ENUM_VALUE3502 = 25;
+  ENUM_VALUE3503 = 26;
+  ENUM_VALUE3504 = 27;
+  ENUM_VALUE3505 = 28;
+  ENUM_VALUE3506 = 29;
+  ENUM_VALUE3507 = 30;
+  ENUM_VALUE3508 = 31;
+  ENUM_VALUE3509 = 32;
+  ENUM_VALUE3510 = 33;
+  ENUM_VALUE3511 = 34;
+  ENUM_VALUE3512 = 35;
+  ENUM_VALUE3513 = 36;
+  ENUM_VALUE3514 = 37;
+  ENUM_VALUE3515 = 38;
+  ENUM_VALUE3516 = 39;
+  ENUM_VALUE3517 = 40;
+  ENUM_VALUE3518 = 41;
+  ENUM_VALUE3519 = 42;
+  ENUM_VALUE3520 = 43;
+  ENUM_VALUE3521 = 44;
+  ENUM_VALUE3522 = 45;
+  ENUM_VALUE3523 = 46;
+  ENUM_VALUE3524 = 47;
+  ENUM_VALUE3525 = 48;
+  ENUM_VALUE3526 = 49;
+  ENUM_VALUE3527 = 50;
+  ENUM_VALUE3528 = 51;
+  ENUM_VALUE3529 = 52;
+  ENUM_VALUE3530 = 53;
+  ENUM_VALUE3531 = 54;
+  ENUM_VALUE3532 = 55;
+  ENUM_VALUE3533 = 56;
+  ENUM_VALUE3534 = 57;
+  ENUM_VALUE3535 = 58;
+  ENUM_VALUE3536 = 59;
+  ENUM_VALUE3537 = 60;
+  ENUM_VALUE3538 = 61;
+  ENUM_VALUE3539 = 62;
+  ENUM_VALUE3540 = 63;
+  ENUM_VALUE3541 = 64;
+  ENUM_VALUE3542 = 65;
+  ENUM_VALUE3543 = 66;
+  ENUM_VALUE3544 = 67;
+  ENUM_VALUE3545 = 68;
+  ENUM_VALUE3546 = 69;
+  ENUM_VALUE3547 = 70;
+  ENUM_VALUE3548 = 71;
+  ENUM_VALUE3549 = 72;
+  ENUM_VALUE3550 = 73;
+  ENUM_VALUE3551 = 74;
+  ENUM_VALUE3552 = 75;
+  ENUM_VALUE3553 = 76;
+  ENUM_VALUE3554 = 77;
+  ENUM_VALUE3555 = 78;
+  ENUM_VALUE3556 = 79;
+  ENUM_VALUE3557 = 80;
+  ENUM_VALUE3558 = 81;
+  ENUM_VALUE3559 = 82;
+  ENUM_VALUE3560 = 83;
+  ENUM_VALUE3561 = 84;
+  ENUM_VALUE3562 = 85;
+  ENUM_VALUE3563 = 86;
+  ENUM_VALUE3564 = 87;
+  ENUM_VALUE3565 = 88;
+  ENUM_VALUE3566 = 89;
+  ENUM_VALUE3567 = 90;
+  ENUM_VALUE3568 = 91;
+  ENUM_VALUE3569 = 92;
+  ENUM_VALUE3570 = 93;
+  ENUM_VALUE3571 = 94;
+  ENUM_VALUE3572 = 95;
+  ENUM_VALUE3573 = 96;
+  ENUM_VALUE3574 = 97;
+  ENUM_VALUE3575 = 98;
+  ENUM_VALUE3576 = 99;
+  ENUM_VALUE3577 = 100;
+  ENUM_VALUE3578 = 101;
+  ENUM_VALUE3579 = 102;
+  ENUM_VALUE3580 = 103;
+  ENUM_VALUE3581 = 104;
+  ENUM_VALUE3582 = 105;
+  ENUM_VALUE3583 = 106;
+  ENUM_VALUE3584 = 107;
+  ENUM_VALUE3585 = 108;
+  ENUM_VALUE3586 = 109;
+  ENUM_VALUE3587 = 110;
+  ENUM_VALUE3588 = 111;
+  ENUM_VALUE3589 = 112;
+  ENUM_VALUE3590 = 113;
+  ENUM_VALUE3591 = 114;
+  ENUM_VALUE3592 = 115;
+  ENUM_VALUE3593 = 116;
+  ENUM_VALUE3594 = 117;
+  ENUM_VALUE3595 = 118;
+  ENUM_VALUE3596 = 119;
+  ENUM_VALUE3597 = 120;
+  ENUM_VALUE3598 = 121;
+  ENUM_VALUE3599 = 122;
+  ENUM_VALUE3600 = 123;
+  ENUM_VALUE3601 = 124;
+  ENUM_VALUE3602 = 125;
+  ENUM_VALUE3603 = 126;
+  ENUM_VALUE3604 = 127;
+  ENUM_VALUE3605 = 128;
+  ENUM_VALUE3606 = 129;
+  ENUM_VALUE3607 = 130;
+  ENUM_VALUE3608 = 131;
+  ENUM_VALUE3609 = 132;
+  ENUM_VALUE3610 = 133;
+  ENUM_VALUE3611 = 134;
+  ENUM_VALUE3612 = 135;
+  ENUM_VALUE3613 = 136;
+  ENUM_VALUE3614 = 137;
+  ENUM_VALUE3615 = 138;
+  ENUM_VALUE3616 = 139;
+  ENUM_VALUE3617 = 140;
+  ENUM_VALUE3618 = 141;
+  ENUM_VALUE3619 = 142;
+  ENUM_VALUE3620 = 143;
+  ENUM_VALUE3621 = 144;
+  ENUM_VALUE3622 = 145;
+  ENUM_VALUE3623 = 146;
+  ENUM_VALUE3624 = 147;
+  ENUM_VALUE3625 = 148;
+  ENUM_VALUE3626 = 149;
+  ENUM_VALUE3627 = 150;
+  ENUM_VALUE3628 = 151;
+  ENUM_VALUE3629 = 152;
+  ENUM_VALUE3630 = 153;
+  ENUM_VALUE3631 = 154;
+  ENUM_VALUE3632 = 155;
+  ENUM_VALUE3633 = 156;
+  ENUM_VALUE3634 = 157;
+  ENUM_VALUE3635 = 158;
+  ENUM_VALUE3636 = 159;
+  ENUM_VALUE3637 = 160;
+  ENUM_VALUE3638 = 161;
+  ENUM_VALUE3639 = 162;
+  ENUM_VALUE3640 = 163;
+  ENUM_VALUE3641 = 164;
+  ENUM_VALUE3642 = 165;
+  ENUM_VALUE3643 = 166;
+  ENUM_VALUE3644 = 167;
+  ENUM_VALUE3645 = 168;
+  ENUM_VALUE3646 = 169;
+  ENUM_VALUE3647 = 170;
+  ENUM_VALUE3648 = 171;
+  ENUM_VALUE3649 = 172;
+  ENUM_VALUE3650 = 173;
+  ENUM_VALUE3651 = 174;
+  ENUM_VALUE3652 = 175;
+  ENUM_VALUE3653 = 176;
+  ENUM_VALUE3654 = 177;
+  ENUM_VALUE3655 = 178;
+  ENUM_VALUE3656 = 179;
+  ENUM_VALUE3657 = 180;
+  ENUM_VALUE3658 = 181;
+  ENUM_VALUE3659 = 182;
+  ENUM_VALUE3660 = 183;
+}
+
+enum Enum10325 {
+  ENUM_VALUE10326 = 0;
+  ENUM_VALUE10327 = 1;
+  ENUM_VALUE10328 = 2;
+  ENUM_VALUE10329 = 3;
+  ENUM_VALUE10330 = 4;
+  ENUM_VALUE10331 = 5;
+  ENUM_VALUE10332 = 6;
+  ENUM_VALUE10333 = 7;
+  ENUM_VALUE10334 = 8;
+}
+
+enum Enum10335 {
+  ENUM_VALUE10336 = 0;
+}
+
+enum Enum10337 {
+  ENUM_VALUE10338 = 0;
+  ENUM_VALUE10339 = 1;
+}
+
+enum Enum11901 {
+  ENUM_VALUE11902 = 0;
+  ENUM_VALUE11903 = 1;
+  ENUM_VALUE11904 = 2;
+  ENUM_VALUE11905 = 3;
+}
+
+enum Enum12735 {
+  ENUM_VALUE12736 = 0;
+  ENUM_VALUE12737 = 1;
+  ENUM_VALUE12738 = 2;
+  ENUM_VALUE12739 = 3;
+}
+
+enum Enum12871 {
+  ENUM_VALUE12872 = 1;
+  ENUM_VALUE12873 = 2;
+  ENUM_VALUE12874 = 3;
+  ENUM_VALUE12875 = 4;
+  ENUM_VALUE12876 = 5;
+  ENUM_VALUE12877 = 6;
+}
+
diff --git a/benchmarks/download_data.sh b/benchmarks/download_data.sh
new file mode 100755
index 00000000..fa0729e9
--- /dev/null
+++ b/benchmarks/download_data.sh
@@ -0,0 +1,5 @@
+#! /bin/sh
+
+curl -O https://storage.googleapis.com/protobuf_opensource_benchmark_data/datasets.tar.gz
+tar -zvxf datasets.tar.gz
+
diff --git a/benchmarks/generate_datasets.cc b/benchmarks/generate_datasets.cc
deleted file mode 100644
index 61e7adf1..00000000
--- a/benchmarks/generate_datasets.cc
+++ /dev/null
@@ -1,117 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include <fstream>
-#include <iostream>
-#include "benchmarks.pb.h"
-
-using benchmarks::BenchmarkDataset;
-using google::protobuf::Descriptor;
-using google::protobuf::DescriptorPool;
-using google::protobuf::Message;
-using google::protobuf::MessageFactory;
-
-std::set<std::string> names;
-
-const char *file_prefix = "dataset.";
-const char *file_suffix = ".pb";
-
-void WriteFileWithPayloads(const std::string& name,
-                           const std::string& message_name,
-                           const std::vector<std::string>& payload) {
-  if (!names.insert(name).second) {
-    std::cerr << "Duplicate test name: " << name << "\n";
-    abort();
-  }
-
-  // First verify that this message name exists in our set of benchmark messages
-  // and that these payloads are valid for the given message.
-  const Descriptor* d =
-      DescriptorPool::generated_pool()->FindMessageTypeByName(message_name);
-
-  if (!d) {
-    std::cerr << "For dataset " << name << ", no such message: "
-              << message_name << "\n";
-    abort();
-  }
-
-  Message* m = MessageFactory::generated_factory()->GetPrototype(d)->New();
-
-  for (size_t i = 0; i < payload.size(); i++) {
-    if (!m->ParseFromString(payload[i])) {
-      std::cerr << "For dataset " << name << ", payload[" << i << "] fails "
-                << "to parse\n";
-      abort();
-    }
-  }
-
-  BenchmarkDataset dataset;
-  dataset.set_name(name);
-  dataset.set_message_name(message_name);
-  for (size_t i = 0; i < payload.size(); i++) {
-    dataset.add_payload()->assign(payload[i]);
-  }
-
-  std::ofstream writer;
-  std::string fname = file_prefix + name + file_suffix;
-  writer.open(fname.c_str());
-  dataset.SerializeToOstream(&writer);
-  writer.close();
-
-  std::cerr << "Wrote dataset: " << fname << "\n";
-}
-
-void WriteFile(const std::string& name, const std::string& message_name,
-               const std::string& payload) {
-  std::vector<std::string> payloads;
-  payloads.push_back(payload);
-  WriteFileWithPayloads(name, message_name, payloads);
-}
-
-std::string ReadFile(const std::string& name) {
-  std::ifstream file(name.c_str());
-  GOOGLE_CHECK(file.is_open()) << "Couldn't find file '" << name <<
-                                  "', please make sure you are running "
-                                  "this command from the benchmarks/ "
-                                  "directory.\n";
-  return std::string((std::istreambuf_iterator<char>(file)),
-                     std::istreambuf_iterator<char>());
-}
-
-int main() {
-  WriteFile("google_message1_proto3", "benchmarks.proto3.GoogleMessage1",
-            ReadFile("google_message1.dat"));
-  WriteFile("google_message1_proto2", "benchmarks.proto2.GoogleMessage1",
-            ReadFile("google_message1.dat"));
-
-  // Not in proto3 because it has a group, which is not supported.
-  WriteFile("google_message2", "benchmarks.proto2.GoogleMessage2",
-            ReadFile("google_message2.dat"));
-}
diff --git a/benchmarks/go/go_benchmark_test.go b/benchmarks/go/go_benchmark_test.go
new file mode 100644
index 00000000..8c741b71
--- /dev/null
+++ b/benchmarks/go/go_benchmark_test.go
@@ -0,0 +1,124 @@
+package main
+
+import (
+	benchmarkWrapper "../tmp"
+	googleMessage1Proto2 "../tmp/datasets/google_message1/proto2"
+	googleMessage1Proto3 "../tmp/datasets/google_message1/proto3"
+	googleMessage2 "../tmp/datasets/google_message2"
+	googleMessage3 "../tmp/datasets/google_message3"
+	googleMessage4 "../tmp/datasets/google_message4"
+	"flag"
+	"github.com/golang/protobuf/proto"
+	"io/ioutil"
+	"testing"
+)
+
+// Data is returned by the Load function.
+type Dataset struct {
+	name        string
+	newMessage  func() proto.Message
+	marshaled   [][]byte
+	unmarshaled []proto.Message
+}
+
+var datasets []Dataset
+
+// This is used to getDefaultInstance for a message type.
+func generateNewMessageFunction(dataset benchmarkWrapper.BenchmarkDataset) func() proto.Message {
+	switch dataset.MessageName {
+	case "benchmarks.proto3.GoogleMessage1":
+		return func() proto.Message { return new(googleMessage1Proto3.GoogleMessage1) }
+	case "benchmarks.proto2.GoogleMessage1":
+		return func() proto.Message { return new(googleMessage1Proto2.GoogleMessage1) }
+	case "benchmarks.proto2.GoogleMessage2":
+		return func() proto.Message { return new(googleMessage2.GoogleMessage2) }
+	case "benchmarks.google_message3.GoogleMessage3":
+		return func() proto.Message { return new(googleMessage3.GoogleMessage3) }
+	case "benchmarks.google_message4.GoogleMessage4":
+		return func() proto.Message { return new(googleMessage4.GoogleMessage4) }
+	default:
+		panic("Unknown message type: " + dataset.MessageName)
+	}
+}
+
+func init() {
+	flag.Parse()
+	for _, f := range flag.Args() {
+		// Load the benchmark.
+		b, err := ioutil.ReadFile(f)
+		if err != nil {
+			panic(err)
+		}
+
+		// Parse the benchmark.
+		var dm benchmarkWrapper.BenchmarkDataset
+		if err := proto.Unmarshal(b, &dm); err != nil {
+			panic(err)
+		}
+
+		// Determine the concrete protobuf message type to use.
+		var ds Dataset
+		ds.newMessage = generateNewMessageFunction(dm)
+
+		// Unmarshal each test message.
+		for _, payload := range dm.Payload {
+			ds.marshaled = append(ds.marshaled, payload)
+			m := ds.newMessage()
+			if err := proto.Unmarshal(payload, m); err != nil {
+				panic(err)
+			}
+			ds.unmarshaled = append(ds.unmarshaled, m)
+		}
+		ds.name = f
+
+		datasets = append(datasets, ds)
+	}
+}
+
+func Benchmark(b *testing.B) {
+	for _, ds := range datasets {
+		b.Run(ds.name, func(b *testing.B) {
+			b.Run("Unmarshal", func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for j, payload := range ds.marshaled {
+						out := ds.newMessage()
+						if err := proto.Unmarshal(payload, out); err != nil {
+							b.Fatalf("can't unmarshal message %d %v", j, err)
+						}
+					}
+				}
+			})
+			b.Run("Marshal", func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for j, m := range ds.unmarshaled {
+						if _, err := proto.Marshal(m); err != nil {
+							b.Fatalf("can't marshal message %d %+v: %v", j, m, err)
+						}
+					}
+				}
+			})
+			b.Run("Size", func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for _, m := range ds.unmarshaled {
+						proto.Size(m)
+					}
+				}
+			})
+			b.Run("Clone", func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for _, m := range ds.unmarshaled {
+						proto.Clone(m)
+					}
+				}
+			})
+			b.Run("Merge", func(b *testing.B) {
+				for i := 0; i < b.N; i++ {
+					for _, m := range ds.unmarshaled {
+						out := ds.newMessage()
+						proto.Merge(out, m)
+					}
+				}
+			})
+		})
+	}
+}
diff --git a/benchmarks/java/pom.xml b/benchmarks/java/pom.xml
new file mode 100755
index 00000000..570bd664
--- /dev/null
+++ b/benchmarks/java/pom.xml
@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>protobuf-java-benchmark</artifactId>
+  <groupId>com.google.protobuf</groupId>
+  <version>1.0.0</version>
+  <name>Protocol Buffers [Benchmark]</name>
+  <description>The benchmark tools for Protobuf Java.</description>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java</artifactId>
+      <version>${protobuf.version}</version>
+      <type>jar</type>
+      <scope>system</scope>
+      <systemPath>${project.basedir}/lib/protobuf-java.jar</systemPath>
+    </dependency>
+    <dependency>
+      <groupId>com.google.caliper</groupId>
+      <artifactId>caliper</artifactId>
+      <version>1.0-beta-2</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-assembly-plugin</artifactId>
+          <version>2.4.1</version>
+          <configuration>
+            <!-- get all project dependencies -->
+            <descriptorRefs>
+              <descriptorRef>jar-with-dependencies</descriptorRef>
+            </descriptorRefs>
+            <!-- MainClass in mainfest make a executable jar -->
+            <archive>
+              <manifest>
+                <mainClass>com.mkyong.core.utils.App</mainClass>
+              </manifest>
+            </archive>
+          </configuration>
+          <executions>
+            <execution>
+              <id>make-assembly</id>
+              <!-- bind to the packaging phase -->
+              <phase>package</phase>
+              <goals>
+                <goal>single</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.5.1</version>
+          <configuration>
+            <source>1.8</source>
+            <target>1.8</target>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>2.5</version>
+          <configuration>
+            <archive>
+              <manifest>
+                <addClasspath>true</addClasspath>
+                <mainClass>com.google.protocolbuffers.ProtoBench</mainClass>
+              </manifest>
+            </archive>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-source-plugin</artifactId>
+          <version>2.4</version>
+          <executions>
+            <execution>
+              <id>attach-sources</id>
+              <goals>
+                <goal>jar-no-fork</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>
+
diff --git a/benchmarks/java/src/main/java/com/google/protobuf/ProtoCaliperBenchmark.java b/benchmarks/java/src/main/java/com/google/protobuf/ProtoCaliperBenchmark.java
new file mode 100755
index 00000000..c766d74e
--- /dev/null
+++ b/benchmarks/java/src/main/java/com/google/protobuf/ProtoCaliperBenchmark.java
@@ -0,0 +1,214 @@
+
+package com.google.protobuf;
+
+import com.google.caliper.BeforeExperiment;
+import com.google.caliper.AfterExperiment;
+import com.google.caliper.Benchmark;
+import com.google.caliper.Param;
+import com.google.caliper.api.VmOptions;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.CodedOutputStream;
+import com.google.protobuf.ExtensionRegistry;
+import com.google.protobuf.Message;
+import com.google.protobuf.benchmarks.Benchmarks.BenchmarkDataset;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.util.ArrayList;
+import java.util.List;
+
+// Caliper set CICompilerCount to 1 for making sure compilation doesn't run in parallel with itself,
+// This makes TieredCompilation not working. We just disable TieredCompilation by default. In master 
+// branch this has been disabled by default in caliper: 
+// https://github.com/google/caliper/blob/master/caliper-runner/src/main/java/com/google/caliper/runner/target/Jvm.java#L38:14
+// But this haven't been added into most recent release.
+@VmOptions("-XX:-TieredCompilation")
+public class ProtoCaliperBenchmark {
+  public enum BenchmarkMessageType {
+    GOOGLE_MESSAGE1_PROTO3 {
+      @Override ExtensionRegistry getExtensionRegistry() { return ExtensionRegistry.newInstance(); }
+      @Override
+      Message getDefaultInstance() {
+        return com.google.protobuf.benchmarks.BenchmarkMessage1Proto3.GoogleMessage1
+            .getDefaultInstance();
+      }
+    },
+    GOOGLE_MESSAGE1_PROTO2 {
+      @Override ExtensionRegistry getExtensionRegistry() { return ExtensionRegistry.newInstance(); }
+      @Override
+      Message getDefaultInstance() {
+        return com.google.protobuf.benchmarks.BenchmarkMessage1Proto2.GoogleMessage1
+            .getDefaultInstance();
+      }
+    },
+    GOOGLE_MESSAGE2 {
+      @Override ExtensionRegistry getExtensionRegistry() { return ExtensionRegistry.newInstance(); }
+      @Override
+      Message getDefaultInstance() {
+        return com.google.protobuf.benchmarks.BenchmarkMessage2.GoogleMessage2.getDefaultInstance();
+      }
+    },
+    GOOGLE_MESSAGE3 {
+      @Override
+      ExtensionRegistry getExtensionRegistry() {
+        ExtensionRegistry extensions = ExtensionRegistry.newInstance();
+        com.google.protobuf.benchmarks.BenchmarkMessage38.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage37.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage36.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage35.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage34.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage33.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage32.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage31.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage3.registerAllExtensions(extensions);
+        return extensions;
+      }
+      @Override
+      Message getDefaultInstance() {
+        return com.google.protobuf.benchmarks.BenchmarkMessage3.GoogleMessage3.getDefaultInstance();
+      }
+    },
+    GOOGLE_MESSAGE4 {
+      @Override
+      ExtensionRegistry getExtensionRegistry() {
+        ExtensionRegistry extensions = ExtensionRegistry.newInstance();
+        com.google.protobuf.benchmarks.BenchmarkMessage43.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage42.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage41.registerAllExtensions(extensions);
+        com.google.protobuf.benchmarks.BenchmarkMessage4.registerAllExtensions(extensions);
+        return extensions;
+      }
+      @Override
+      Message getDefaultInstance() {
+        return com.google.protobuf.benchmarks.BenchmarkMessage4.GoogleMessage4.getDefaultInstance();
+      }
+    };
+    
+    abstract ExtensionRegistry getExtensionRegistry();
+    abstract Message getDefaultInstance();
+  }
+
+  private BenchmarkMessageType benchmarkMessageType;
+  @Param("")
+  private String dataFile;
+  
+  private byte[] inputData;
+  private BenchmarkDataset benchmarkDataset;
+  private Message defaultMessage;
+  private ExtensionRegistry extensions;
+  private List<byte[]> inputDataList;
+  private List<ByteArrayInputStream> inputStreamList;
+  private List<ByteString> inputStringList;
+  private List<Message> sampleMessageList;
+
+  private BenchmarkMessageType getMessageType() throws IOException {
+    if (benchmarkDataset.getMessageName().equals("benchmarks.proto3.GoogleMessage1")) {
+      return BenchmarkMessageType.GOOGLE_MESSAGE1_PROTO3;
+    } else if (benchmarkDataset.getMessageName().equals("benchmarks.proto2.GoogleMessage1")) {
+      return BenchmarkMessageType.GOOGLE_MESSAGE1_PROTO2;
+    } else if (benchmarkDataset.getMessageName().equals("benchmarks.proto2.GoogleMessage2")) {
+      return BenchmarkMessageType.GOOGLE_MESSAGE2;
+    } else if (benchmarkDataset.getMessageName().
+        equals("benchmarks.google_message3.GoogleMessage3")) {
+      return BenchmarkMessageType.GOOGLE_MESSAGE3;
+    } else if (benchmarkDataset.getMessageName().
+        equals("benchmarks.google_message4.GoogleMessage4")) {
+      return BenchmarkMessageType.GOOGLE_MESSAGE4;
+    } else {
+      throw new IllegalStateException("Invalid DataFile! There's no testing message named "
+          + benchmarkDataset.getMessageName());
+    }
+  }
+  
+  @BeforeExperiment
+  void setUp() throws IOException {
+    if (!dataFile.equals("")) {
+      RandomAccessFile file = new RandomAccessFile(new File(dataFile), "r");
+      inputData = new byte[(int) file.length()];
+      file.readFully(inputData);
+      benchmarkDataset = BenchmarkDataset.parseFrom(inputData);
+      benchmarkMessageType = getMessageType();
+    } else {
+      inputData = new byte[0];
+      benchmarkDataset = BenchmarkDataset.parseFrom(inputData);
+      benchmarkMessageType = BenchmarkMessageType.GOOGLE_MESSAGE2;
+    }
+    defaultMessage = benchmarkMessageType.getDefaultInstance();
+    extensions = benchmarkMessageType.getExtensionRegistry();
+    inputDataList = new ArrayList<byte[]>();
+    inputStreamList = new ArrayList<ByteArrayInputStream>();
+    inputStringList = new ArrayList<ByteString>();
+    sampleMessageList = new ArrayList<Message>();
+    
+    for (int i = 0; i < benchmarkDataset.getPayloadCount(); i++) {
+      byte[] singleInputData = benchmarkDataset.getPayload(i).toByteArray();
+      inputDataList.add(benchmarkDataset.getPayload(i).toByteArray());
+      inputStreamList.add(new ByteArrayInputStream(
+          benchmarkDataset.getPayload(i).toByteArray()));
+      inputStringList.add(benchmarkDataset.getPayload(i));
+      sampleMessageList.add(
+          defaultMessage.newBuilderForType().mergeFrom(singleInputData, extensions).build());
+    }
+  }
+  
+  
+  @Benchmark
+  void serializeToByteArray(int reps) throws IOException {
+    if (sampleMessageList.size() == 0) {
+      return;
+    }
+    for (int i = 0; i < reps; i++) {
+      for (int j = 0; j < sampleMessageList.size(); j++) {
+        sampleMessageList.get(j).toByteArray();  
+      }
+    }
+  }
+  
+  @Benchmark
+  void serializeToMemoryStream(int reps) throws IOException {
+    if (sampleMessageList.size() == 0) {
+      return;
+    }
+    for (int i = 0; i < reps; i++) {
+      for (int j = 0; j < sampleMessageList.size(); j++) {
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        sampleMessageList.get(j).writeTo(output); 
+      }
+    }
+  }
+  
+  @Benchmark
+  void deserializeFromByteArray(int reps) throws IOException {
+    if (inputDataList.size() == 0) {
+      return;
+    }
+    for (int i = 0; i < reps; i++) {
+      for (int j = 0; j < inputDataList.size(); j++) {
+        benchmarkMessageType.getDefaultInstance().getParserForType().parseFrom(
+          inputDataList.get(j), extensions);
+      }
+    }
+  }
+  
+  @Benchmark
+  void deserializeFromMemoryStream(int reps) throws IOException {
+    if (inputStreamList.size() == 0) {
+      return;
+    }
+    for (int i = 0; i < reps; i++) {
+      for (int j = 0; j < inputStreamList.size(); j++) {
+        benchmarkMessageType.getDefaultInstance().getParserForType().parseFrom(
+            inputStreamList.get(j), extensions);
+        inputStreamList.get(j).reset();
+      }
+    }
+  }
+}
+
+
diff --git a/benchmarks/python/__init__.py b/benchmarks/python/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/benchmarks/python/__init__.py
diff --git a/benchmarks/python/py_benchmark.py b/benchmarks/python/py_benchmark.py
new file mode 100755
index 00000000..6942d208
--- /dev/null
+++ b/benchmarks/python/py_benchmark.py
@@ -0,0 +1,152 @@
+import sys
+import os
+import timeit
+import math
+import argparse
+import fnmatch
+import json
+
+parser = argparse.ArgumentParser(description="Python protobuf benchmark")
+parser.add_argument("data_files", metavar="dataFile", nargs="+", 
+                    help="testing data files.")
+parser.add_argument("--json", action="store_const", dest="json",
+                    const="yes", default="no",
+                    help="Whether to output json results")
+parser.add_argument("--behavior_prefix", dest="behavior_prefix",
+                    help="The output json format's behavior's name's prefix",
+                    default="")
+# BEGIN CPP GENERATED MESSAGE
+parser.add_argument("--cpp_generated", action="store_const",
+                    dest="cpp_generated", const="yes", default="no",
+                    help="Whether to link generated code library")
+# END CPP GENERATED MESSAGE
+args = parser.parse_args()
+# BEGIN CPP GENERATED MESSAGE
+# CPP generated code must be linked before importing the generated Python code
+# for the descriptor can be found in the pool
+if args.cpp_generated != "no":
+  sys.path.append( os.path.dirname( os.path.dirname( os.path.abspath(__file__) ) ) + "/.libs" )
+  import libbenchmark_messages
+  sys.path.append( os.path.dirname( os.path.dirname( os.path.abspath(__file__) ) ) + "/tmp" )
+# END CPP GENERATED MESSAGE
+
+
+import datasets.google_message1.proto2.benchmark_message1_proto2_pb2 as benchmark_message1_proto2_pb2
+import datasets.google_message1.proto3.benchmark_message1_proto3_pb2 as benchmark_message1_proto3_pb2
+import datasets.google_message2.benchmark_message2_pb2 as benchmark_message2_pb2
+import datasets.google_message3.benchmark_message3_pb2 as benchmark_message3_pb2
+import datasets.google_message4.benchmark_message4_pb2 as benchmark_message4_pb2
+import benchmarks_pb2 as benchmarks_pb2
+
+
+def run_one_test(filename):
+  data = open(filename).read()
+  benchmark_dataset = benchmarks_pb2.BenchmarkDataset()
+  benchmark_dataset.ParseFromString(data)
+  benchmark_util = Benchmark(full_iteration=len(benchmark_dataset.payload),
+                             module="py_benchmark",
+                             setup_method="init")
+  result={}
+  result["filename"] =  filename
+  result["message_name"] =  benchmark_dataset.message_name
+  result["benchmarks"] = {}
+  benchmark_util.set_test_method("parse_from_benchmark")
+  result["benchmarks"][args.behavior_prefix + "_parse_from_benchmark"] = \
+    benchmark_util.run_benchmark(setup_method_args='"%s"' % (filename))
+  benchmark_util.set_test_method("serialize_to_benchmark")
+  result["benchmarks"][args.behavior_prefix + "_serialize_to_benchmark"] = \
+    benchmark_util.run_benchmark(setup_method_args='"%s"' % (filename))
+  return result
+
+
+def init(filename):
+  global benchmark_dataset, message_class, message_list, counter
+  message_list=[]
+  counter = 0
+  data = open(os.path.dirname(sys.argv[0]) + "/../" + filename).read()
+  benchmark_dataset = benchmarks_pb2.BenchmarkDataset()
+  benchmark_dataset.ParseFromString(data)
+
+  if benchmark_dataset.message_name == "benchmarks.proto3.GoogleMessage1":
+    message_class = benchmark_message1_proto3_pb2.GoogleMessage1
+  elif benchmark_dataset.message_name == "benchmarks.proto2.GoogleMessage1":
+    message_class = benchmark_message1_proto2_pb2.GoogleMessage1
+  elif benchmark_dataset.message_name == "benchmarks.proto2.GoogleMessage2":
+    message_class = benchmark_message2_pb2.GoogleMessage2
+  elif benchmark_dataset.message_name == "benchmarks.google_message3.GoogleMessage3":
+    message_class = benchmark_message3_pb2.GoogleMessage3
+  elif benchmark_dataset.message_name == "benchmarks.google_message4.GoogleMessage4":
+    message_class = benchmark_message4_pb2.GoogleMessage4
+  else:
+    raise IOError("Message %s not found!" % (benchmark_dataset.message_name))
+
+  for one_payload in benchmark_dataset.payload:
+    temp = message_class()
+    temp.ParseFromString(one_payload)
+    message_list.append(temp)
+
+
+def parse_from_benchmark():
+  global counter, message_class, benchmark_dataset
+  m = message_class().ParseFromString(benchmark_dataset.payload[counter % len(benchmark_dataset.payload)])
+  counter = counter + 1
+
+
+def serialize_to_benchmark():
+  global counter, message_list, message_class
+  s = message_list[counter % len(benchmark_dataset.payload)].SerializeToString()
+  counter = counter + 1
+
+
+class Benchmark:
+  def __init__(self, module=None, test_method=None,
+               setup_method=None, full_iteration = 1):
+    self.full_iteration = full_iteration
+    self.module = module
+    self.test_method = test_method
+    self.setup_method = setup_method
+
+  def set_test_method(self, test_method):
+    self.test_method = test_method
+
+  def full_setup_code(self, setup_method_args=''):
+    setup_code = ""
+    setup_code += "from %s import %s\n" % (self.module, self.test_method)
+    setup_code += "from %s import %s\n" % (self.module, self.setup_method)
+    setup_code += "%s(%s)\n" % (self.setup_method, setup_method_args)
+    return setup_code
+
+  def dry_run(self, test_method_args='', setup_method_args=''):
+    return timeit.timeit(stmt="%s(%s)" % (self.test_method, test_method_args),
+                         setup=self.full_setup_code(setup_method_args),
+                         number=self.full_iteration);
+
+  def run_benchmark(self, test_method_args='', setup_method_args=''):
+    reps = self.full_iteration;
+    t = self.dry_run(test_method_args, setup_method_args);
+    if t < 3 :
+      reps = int(math.ceil(3 / t)) * self.full_iteration
+    t = timeit.timeit(stmt="%s(%s)" % (self.test_method, test_method_args),
+                      setup=self.full_setup_code(setup_method_args),
+                      number=reps);
+    return 1.0 * t / reps * (10 ** 9)
+  
+
+if __name__ == "__main__":
+  results = []
+  for file in args.data_files:
+    results.append(run_one_test(file))
+  
+  if args.json != "no":
+    print json.dumps(results)
+  else:
+    for result in results:
+      print "Message %s of dataset file %s" % \
+          (result["message_name"], result["filename"])
+      print "Average time for parse_from_benchmark: %.2f ns" % \
+          (result["benchmarks"][ \
+                      args.behavior_prefix + "_parse_from_benchmark"])
+      print "Average time for serialize_to_benchmark: %.2f ns" % \
+          (result["benchmarks"][ \
+                      args.behavior_prefix + "_serialize_to_benchmark"])
+      print ""
diff --git a/benchmarks/python/python_benchmark_messages.cc b/benchmarks/python/python_benchmark_messages.cc
new file mode 100644
index 00000000..ded16fe9
--- /dev/null
+++ b/benchmarks/python/python_benchmark_messages.cc
@@ -0,0 +1,29 @@
+#include <Python.h>
+
+#include "benchmarks.pb.h"
+#include "datasets/google_message1/proto2/benchmark_message1_proto2.pb.h"
+#include "datasets/google_message1/proto3/benchmark_message1_proto3.pb.h"
+#include "datasets/google_message2/benchmark_message2.pb.h"
+#include "datasets/google_message3/benchmark_message3.pb.h"
+#include "datasets/google_message4/benchmark_message4.pb.h"
+
+static PyMethodDef python_benchmark_methods[] = {
+    {NULL, NULL, 0, NULL}        /* Sentinel */
+};
+
+
+PyMODINIT_FUNC
+initlibbenchmark_messages() {
+  benchmarks::BenchmarkDataset().descriptor();
+  benchmarks::proto3::GoogleMessage1().descriptor();
+  benchmarks::proto2::GoogleMessage1().descriptor();
+  benchmarks::proto2::GoogleMessage2().descriptor();
+  benchmarks::google_message3::GoogleMessage3().descriptor();
+  benchmarks::google_message4::GoogleMessage4().descriptor();
+
+  PyObject *m;
+
+  m = Py_InitModule("libbenchmark_messages", python_benchmark_methods);
+  if (m == NULL)
+      return;
+}
diff --git a/benchmarks/readme.txt b/benchmarks/readme.txt
deleted file mode 100644
index b08b8bc0..00000000
--- a/benchmarks/readme.txt
+++ /dev/null
@@ -1,46 +0,0 @@
-Contents
---------
-
-This folder contains three kinds of file:
-
-- Code, such as ProtoBench.java, to build the benchmarking framework.
-- Protocol buffer definitions (.proto files)
-- Sample data files
-
-If we end up with a lot of different benchmarks it may be worth
-separating these out info different directories, but while there are
-so few they might as well all be together.
-
-Running a benchmark (Java)
---------------------------
-
-1) Build protoc and the Java protocol buffer library. The examples
-   below assume a jar file (protobuf.jar) has been built and copied
-   into this directory.
-
-2) Build ProtoBench:
-   $ javac -d tmp -cp protobuf.jar ProtoBench.java
-   
-3) Generate code for the relevant benchmark protocol buffer, e.g.
-   $ protoc --java_out=tmp google_size.proto
-   
-4) Build the generated code, e.g.
-   $ javac -d tmp -cp protobuf.jar tmp/benchmarks/*.java
-           
-5) Run the test. Arguments are given in pairs - the first argument
-   is the descriptor type; the second is the filename. For example:
-   $ java -cp tmp:protobuf.jar com.google.protocolbuffers.ProtoBench \
-       'benchmarks.GoogleSize$SizeMessage1' google_message1.dat \
-       'benchmarks.GoogleSize$SizeMessage2' google_message2.dat
-          
-6) Wait! Each test runs for around 30 seconds, and there are 8 tests
-   per class/data combination. The above command would therefore take
-   about 8 minutes to run.
-
-   
-Benchmarks available
---------------------
-
-From Google:
-google_size.proto,
-messages google_message1.dat and google_message2.dat.
diff --git a/benchmarks/util/__init__.py b/benchmarks/util/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/benchmarks/util/__init__.py
diff --git a/benchmarks/util/big_query_utils.py b/benchmarks/util/big_query_utils.py
new file mode 100755
index 00000000..14105aa6
--- /dev/null
+++ b/benchmarks/util/big_query_utils.py
@@ -0,0 +1,188 @@
+#!/usr/bin/env python2.7
+
+import argparse
+import json
+import uuid
+import httplib2
+
+from apiclient import discovery
+from apiclient.errors import HttpError
+from oauth2client.client import GoogleCredentials
+
+# 30 days in milliseconds
+_EXPIRATION_MS = 30 * 24 * 60 * 60 * 1000
+NUM_RETRIES = 3
+
+
+def create_big_query():
+    """Authenticates with cloud platform and gets a BiqQuery service object
+  """
+    creds = GoogleCredentials.get_application_default()
+    return discovery.build(
+        'bigquery', 'v2', credentials=creds, cache_discovery=False)
+
+
+def create_dataset(biq_query, project_id, dataset_id):
+    is_success = True
+    body = {
+        'datasetReference': {
+            'projectId': project_id,
+            'datasetId': dataset_id
+        }
+    }
+
+    try:
+        dataset_req = biq_query.datasets().insert(
+            projectId=project_id, body=body)
+        dataset_req.execute(num_retries=NUM_RETRIES)
+    except HttpError as http_error:
+        if http_error.resp.status == 409:
+            print 'Warning: The dataset %s already exists' % dataset_id
+        else:
+            # Note: For more debugging info, print "http_error.content"
+            print 'Error in creating dataset: %s. Err: %s' % (dataset_id,
+                                                              http_error)
+            is_success = False
+    return is_success
+
+
+def create_table(big_query, project_id, dataset_id, table_id, table_schema,
+                 description):
+    fields = [{
+        'name': field_name,
+        'type': field_type,
+        'description': field_description
+    } for (field_name, field_type, field_description) in table_schema]
+    return create_table2(big_query, project_id, dataset_id, table_id, fields,
+                         description)
+
+
+def create_partitioned_table(big_query,
+                             project_id,
+                             dataset_id,
+                             table_id,
+                             table_schema,
+                             description,
+                             partition_type='DAY',
+                             expiration_ms=_EXPIRATION_MS):
+    """Creates a partitioned table. By default, a date-paritioned table is created with
+  each partition lasting 30 days after it was last modified.
+  """
+    fields = [{
+        'name': field_name,
+        'type': field_type,
+        'description': field_description
+    } for (field_name, field_type, field_description) in table_schema]
+    return create_table2(big_query, project_id, dataset_id, table_id, fields,
+                         description, partition_type, expiration_ms)
+
+
+def create_table2(big_query,
+                  project_id,
+                  dataset_id,
+                  table_id,
+                  fields_schema,
+                  description,
+                  partition_type=None,
+                  expiration_ms=None):
+    is_success = True
+
+    body = {
+        'description': description,
+        'schema': {
+            'fields': fields_schema
+        },
+        'tableReference': {
+            'datasetId': dataset_id,
+            'projectId': project_id,
+            'tableId': table_id
+        }
+    }
+
+    if partition_type and expiration_ms:
+        body["timePartitioning"] = {
+            "type": partition_type,
+            "expirationMs": expiration_ms
+        }
+
+    try:
+        table_req = big_query.tables().insert(
+            projectId=project_id, datasetId=dataset_id, body=body)
+        res = table_req.execute(num_retries=NUM_RETRIES)
+        print 'Successfully created %s "%s"' % (res['kind'], res['id'])
+    except HttpError as http_error:
+        if http_error.resp.status == 409:
+            print 'Warning: Table %s already exists' % table_id
+        else:
+            print 'Error in creating table: %s. Err: %s' % (table_id,
+                                                            http_error)
+            is_success = False
+    return is_success
+
+
+def patch_table(big_query, project_id, dataset_id, table_id, fields_schema):
+    is_success = True
+
+    body = {
+        'schema': {
+            'fields': fields_schema
+        },
+        'tableReference': {
+            'datasetId': dataset_id,
+            'projectId': project_id,
+            'tableId': table_id
+        }
+    }
+
+    try:
+        table_req = big_query.tables().patch(
+            projectId=project_id,
+            datasetId=dataset_id,
+            tableId=table_id,
+            body=body)
+        res = table_req.execute(num_retries=NUM_RETRIES)
+        print 'Successfully patched %s "%s"' % (res['kind'], res['id'])
+    except HttpError as http_error:
+        print 'Error in creating table: %s. Err: %s' % (table_id, http_error)
+        is_success = False
+    return is_success
+
+
+def insert_rows(big_query, project_id, dataset_id, table_id, rows_list):
+    is_success = True
+    body = {'rows': rows_list}
+    try:
+        insert_req = big_query.tabledata().insertAll(
+            projectId=project_id,
+            datasetId=dataset_id,
+            tableId=table_id,
+            body=body)
+        res = insert_req.execute(num_retries=NUM_RETRIES)
+        if res.get('insertErrors', None):
+            print 'Error inserting rows! Response: %s' % res
+            is_success = False
+    except HttpError as http_error:
+        print 'Error inserting rows to the table %s' % table_id
+        is_success = False
+
+    return is_success
+
+
+def sync_query_job(big_query, project_id, query, timeout=5000):
+    query_data = {'query': query, 'timeoutMs': timeout}
+    query_job = None
+    try:
+        query_job = big_query.jobs().query(
+            projectId=project_id,
+            body=query_data).execute(num_retries=NUM_RETRIES)
+    except HttpError as http_error:
+        print 'Query execute job failed with error: %s' % http_error
+        print http_error.content
+    return query_job
+
+
+    # List of (column name, column type, description) tuples
+def make_row(unique_row_id, row_values_dict):
+    """row_values_dict is a dictionary of column name and column value.
+  """
+    return {'insertId': unique_row_id, 'json': row_values_dict}
diff --git a/benchmarks/util/data_proto2_to_proto3_util.h b/benchmarks/util/data_proto2_to_proto3_util.h
new file mode 100644
index 00000000..5eea8509
--- /dev/null
+++ b/benchmarks/util/data_proto2_to_proto3_util.h
@@ -0,0 +1,64 @@
+#ifndef PROTOBUF_BENCHMARKS_UTIL_DATA_PROTO2_TO_PROTO3_UTIL_H_
+#define PROTOBUF_BENCHMARKS_UTIL_DATA_PROTO2_TO_PROTO3_UTIL_H_
+
+#include "google/protobuf/message.h"
+#include "google/protobuf/descriptor.h"
+
+using google::protobuf::FieldDescriptor;
+using google::protobuf::Message;
+using google::protobuf::Reflection;
+
+namespace google {
+namespace protobuf {
+namespace util {
+
+class DataStripper {
+ public:
+  void StripMessage(Message *message) {
+    std::vector<const FieldDescriptor*> set_fields;
+    const Reflection* reflection = message->GetReflection();
+    reflection->ListFields(*message, &set_fields);
+
+    for (size_t i = 0; i < set_fields.size(); i++) {
+      const FieldDescriptor* field = set_fields[i];
+      if (ShouldBeClear(field)) {
+        reflection->ClearField(message, field);
+        continue;
+      }
+      if (field->type() == FieldDescriptor::TYPE_MESSAGE) {
+        if (field->is_repeated()) {
+          for (int j = 0; j < reflection->FieldSize(*message, field); j++) {
+            StripMessage(reflection->MutableRepeatedMessage(message, field, j));
+          }
+        } else {
+          StripMessage(reflection->MutableMessage(message, field));
+        }
+      }
+    }
+
+    reflection->MutableUnknownFields(message)->Clear();
+  }
+ private:
+  virtual bool ShouldBeClear(const FieldDescriptor *field) = 0;
+};
+
+class GogoDataStripper : public DataStripper {
+ private:
+  virtual bool ShouldBeClear(const FieldDescriptor *field) {
+    return field->type() == FieldDescriptor::TYPE_GROUP;
+  }
+};
+
+class Proto3DataStripper : public DataStripper {
+ private:
+  virtual bool ShouldBeClear(const FieldDescriptor *field) {
+    return field->type() == FieldDescriptor::TYPE_GROUP ||
+           field->is_extension();
+  }
+};
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // PROTOBUF_BENCHMARKS_UTIL_DATA_PROTO2_TO_PROTO3_UTIL_H_
diff --git a/benchmarks/util/gogo_data_scrubber.cc b/benchmarks/util/gogo_data_scrubber.cc
new file mode 100644
index 00000000..9ef57b0d
--- /dev/null
+++ b/benchmarks/util/gogo_data_scrubber.cc
@@ -0,0 +1,74 @@
+#include "benchmarks.pb.h"
+#include "datasets/google_message1/proto2/benchmark_message1_proto2.pb.h"
+#include "datasets/google_message1/proto3/benchmark_message1_proto3.pb.h"
+#include "datasets/google_message2/benchmark_message2.pb.h"
+#include "datasets/google_message3/benchmark_message3.pb.h"
+#include "datasets/google_message4/benchmark_message4.pb.h"
+#include "data_proto2_to_proto3_util.h"
+
+#include <fstream>
+
+using google::protobuf::util::GogoDataStripper;
+
+std::string ReadFile(const std::string& name) {
+  std::ifstream file(name.c_str());
+  GOOGLE_CHECK(file.is_open()) << "Couldn't find file '"
+      << name
+      << "', please make sure you are running this command from the benchmarks"
+      << " directory.\n";
+  return std::string((std::istreambuf_iterator<char>(file)),
+                     std::istreambuf_iterator<char>());
+}
+
+int main(int argc, char *argv[]) {
+  if (argc % 2 == 0 || argc == 1) {
+    std::cerr << "Usage: [input_files] [output_file_names] where " <<
+        "input_files are one to one mapping to output_file_names." <<
+        std::endl;
+    return 1;
+  }
+
+  for (int i = argc / 2; i > 0; i--) {
+    const std::string &input_file = argv[i];
+    const std::string &output_file = argv[i + argc / 2];
+
+    std::cerr << "Generating " << input_file
+        << " to " << output_file << std::endl;
+    benchmarks::BenchmarkDataset dataset;
+    Message* message;
+    std::string dataset_payload = ReadFile(input_file);
+    GOOGLE_CHECK(dataset.ParseFromString(dataset_payload))
+      << "Can' t parse data file " << input_file;
+
+    if (dataset.message_name() == "benchmarks.proto3.GoogleMessage1") {
+      message = new benchmarks::proto3::GoogleMessage1;
+    } else if (dataset.message_name() == "benchmarks.proto2.GoogleMessage1") {
+      message = new benchmarks::proto2::GoogleMessage1;
+    } else if (dataset.message_name() == "benchmarks.proto2.GoogleMessage2") {
+      message = new benchmarks::proto2::GoogleMessage2;
+    } else if (dataset.message_name() ==
+        "benchmarks.google_message3.GoogleMessage3") {
+      message = new benchmarks::google_message3::GoogleMessage3;
+    } else if (dataset.message_name() ==
+        "benchmarks.google_message4.GoogleMessage4") {
+      message = new benchmarks::google_message4::GoogleMessage4;
+    } else {
+      std::cerr << "Unknown message type: " << dataset.message_name();
+      exit(1);
+    }
+
+    for (int i = 0; i < dataset.payload_size(); i++) {
+      message->ParseFromString(dataset.payload(i));
+      GogoDataStripper stripper;
+      stripper.StripMessage(message);
+      dataset.set_payload(i, message->SerializeAsString());
+    }
+
+    std::ofstream ofs(output_file);
+    ofs << dataset.SerializeAsString();
+    ofs.close();
+  }
+
+
+  return 0;
+}
diff --git a/benchmarks/util/proto3_data_stripper.cc b/benchmarks/util/proto3_data_stripper.cc
new file mode 100644
index 00000000..3096c4c1
--- /dev/null
+++ b/benchmarks/util/proto3_data_stripper.cc
@@ -0,0 +1,74 @@
+#include "benchmarks.pb.h"
+#include "datasets/google_message1/proto2/benchmark_message1_proto2.pb.h"
+#include "datasets/google_message1/proto3/benchmark_message1_proto3.pb.h"
+#include "datasets/google_message2/benchmark_message2.pb.h"
+#include "datasets/google_message3/benchmark_message3.pb.h"
+#include "datasets/google_message4/benchmark_message4.pb.h"
+#include "data_proto2_to_proto3_util.h"
+
+#include <fstream>
+
+using google::protobuf::util::Proto3DataStripper;
+
+std::string ReadFile(const std::string& name) {
+  std::ifstream file(name.c_str());
+  GOOGLE_CHECK(file.is_open()) << "Couldn't find file '"
+      << name
+      << "', please make sure you are running this command from the benchmarks"
+      << " directory.\n";
+  return std::string((std::istreambuf_iterator<char>(file)),
+                     std::istreambuf_iterator<char>());
+}
+
+int main(int argc, char *argv[]) {
+  if (argc % 2 == 0 || argc == 1) {
+    std::cerr << "Usage: [input_files] [output_file_names] where " <<
+        "input_files are one to one mapping to output_file_names." <<
+        std::endl;
+    return 1;
+  }
+
+  for (int i = argc / 2; i > 0; i--) {
+    const std::string &input_file = argv[i];
+    const std::string &output_file = argv[i + argc / 2];
+
+    std::cerr << "Generating " << input_file
+        << " to " << output_file << std::endl;
+    benchmarks::BenchmarkDataset dataset;
+    Message* message;
+    std::string dataset_payload = ReadFile(input_file);
+    GOOGLE_CHECK(dataset.ParseFromString(dataset_payload))
+      << "Can' t parse data file " << input_file;
+
+    if (dataset.message_name() == "benchmarks.proto3.GoogleMessage1") {
+      message = new benchmarks::proto3::GoogleMessage1;
+    } else if (dataset.message_name() == "benchmarks.proto2.GoogleMessage1") {
+      message = new benchmarks::proto2::GoogleMessage1;
+    } else if (dataset.message_name() == "benchmarks.proto2.GoogleMessage2") {
+      message = new benchmarks::proto2::GoogleMessage2;
+    } else if (dataset.message_name() ==
+        "benchmarks.google_message3.GoogleMessage3") {
+      message = new benchmarks::google_message3::GoogleMessage3;
+    } else if (dataset.message_name() ==
+        "benchmarks.google_message4.GoogleMessage4") {
+      message = new benchmarks::google_message4::GoogleMessage4;
+    } else {
+      std::cerr << "Unknown message type: " << dataset.message_name();
+      exit(1);
+    }
+
+    for (int i = 0; i < dataset.payload_size(); i++) {
+      message->ParseFromString(dataset.payload(i));
+      Proto3DataStripper stripper;
+      stripper.StripMessage(message);
+      dataset.set_payload(i, message->SerializeAsString());
+    }
+
+    std::ofstream ofs(output_file);
+    ofs << dataset.SerializeAsString();
+    ofs.close();
+  }
+
+
+  return 0;
+}
diff --git a/benchmarks/util/protoc-gen-gogoproto.cc b/benchmarks/util/protoc-gen-gogoproto.cc
new file mode 100644
index 00000000..9c1b3d04
--- /dev/null
+++ b/benchmarks/util/protoc-gen-gogoproto.cc
@@ -0,0 +1,103 @@
+#include "google/protobuf/compiler/code_generator.h"
+#include "google/protobuf/io/zero_copy_stream.h"
+#include "google/protobuf/io/printer.h"
+#include "google/protobuf/descriptor.h"
+#include "google/protobuf/descriptor.pb.h"
+#include "schema_proto2_to_proto3_util.h"
+
+#include "google/protobuf/compiler/plugin.h"
+
+using google::protobuf::FileDescriptorProto;
+using google::protobuf::FileDescriptor;
+using google::protobuf::DescriptorPool;
+using google::protobuf::io::Printer;
+using google::protobuf::util::SchemaGroupStripper;
+using google::protobuf::util::EnumScrubber;
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+
+namespace {
+
+string StripProto(string filename) {
+  if (filename.substr(filename.size() - 11) == ".protodevel") {
+    // .protodevel
+    return filename.substr(0, filename.size() - 11);
+  } else {
+    // .proto
+    return filename.substr(0, filename.size() - 6);
+  }
+}
+
+DescriptorPool new_pool_;
+
+}  // namespace
+
+class GoGoProtoGenerator : public CodeGenerator {
+ public:
+  virtual bool GenerateAll(const std::vector<const FileDescriptor*>& files,
+                           const string& parameter,
+                           GeneratorContext* context,
+                           string* error) const {
+    for (int i = 0; i < files.size(); i++) {
+      for (auto file : files) {
+        bool can_generate =
+            (new_pool_.FindFileByName(file->name()) == nullptr);
+        for (int j = 0; j < file->dependency_count(); j++) {
+          can_generate &= (new_pool_.FindFileByName(
+              file->dependency(j)->name()) != nullptr);
+        }
+        for (int j = 0; j < file->public_dependency_count(); j++) {
+          can_generate &= (new_pool_.FindFileByName(
+              file->public_dependency(j)->name()) != nullptr);
+        }
+        for (int j = 0; j < file->weak_dependency_count(); j++) {
+          can_generate &= (new_pool_.FindFileByName(
+              file->weak_dependency(j)->name()) != nullptr);
+        }
+        if (can_generate) {
+          Generate(file, parameter, context, error);
+          break;
+        }
+      }
+    }
+
+    return true;
+  }
+
+  virtual bool Generate(const FileDescriptor* file,
+                        const string& parameter,
+                        GeneratorContext* context,
+                        string* error) const {
+    FileDescriptorProto new_file;
+    file->CopyTo(&new_file);
+    SchemaGroupStripper::StripFile(file, &new_file);
+
+    EnumScrubber enum_scrubber;
+    enum_scrubber.ScrubFile(&new_file);
+
+    string filename = file->name();
+    string basename = StripProto(filename);
+
+    std::vector<std::pair<string,string>> option_pairs;
+    ParseGeneratorParameter(parameter, &option_pairs);
+
+    std::unique_ptr<google::protobuf::io::ZeroCopyOutputStream> output(
+        context->Open(basename + ".proto"));
+    string content = new_pool_.BuildFile(new_file)->DebugString();
+    Printer printer(output.get(), '$');
+    printer.WriteRaw(content.c_str(), content.size());
+
+    return true;
+  }
+};
+
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+
+int main(int argc, char* argv[]) {
+  google::protobuf::compiler::GoGoProtoGenerator generator;
+  return google::protobuf::compiler::PluginMain(argc, argv, &generator);
+}
diff --git a/benchmarks/util/protoc-gen-proto2_to_proto3.cc b/benchmarks/util/protoc-gen-proto2_to_proto3.cc
new file mode 100644
index 00000000..d0a89023
--- /dev/null
+++ b/benchmarks/util/protoc-gen-proto2_to_proto3.cc
@@ -0,0 +1,115 @@
+#include "google/protobuf/compiler/code_generator.h"
+#include "google/protobuf/io/zero_copy_stream.h"
+#include "google/protobuf/io/printer.h"
+#include "google/protobuf/descriptor.h"
+#include "google/protobuf/descriptor.pb.h"
+#include "schema_proto2_to_proto3_util.h"
+
+#include "google/protobuf/compiler/plugin.h"
+
+using google::protobuf::FileDescriptorProto;
+using google::protobuf::FileDescriptor;
+using google::protobuf::DescriptorPool;
+using google::protobuf::io::Printer;
+using google::protobuf::util::SchemaGroupStripper;
+using google::protobuf::util::EnumScrubber;
+using google::protobuf::util::ExtensionStripper;
+using google::protobuf::util::FieldScrubber;
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+
+namespace {
+
+string StripProto(string filename) {
+  return filename.substr(0, filename.rfind(".proto"));
+}
+
+DescriptorPool* GetPool() {
+  static DescriptorPool *pool = new DescriptorPool();
+  return pool;
+}
+
+}  // namespace
+
+class Proto2ToProto3Generator final : public CodeGenerator {
+ public:
+  bool GenerateAll(const std::vector<const FileDescriptor*>& files,
+                           const string& parameter,
+                           GeneratorContext* context,
+                           string* error) const {
+    for (int i = 0; i < files.size(); i++) {
+      for (auto file : files) {
+        if (CanGenerate(file)) {
+          Generate(file, parameter, context, error);
+          break;
+        }
+      }
+    }
+
+    return true;
+  }
+
+  bool Generate(const FileDescriptor* file,
+                        const string& parameter,
+                        GeneratorContext* context,
+                        string* error) const {
+    FileDescriptorProto new_file;
+    file->CopyTo(&new_file);
+    SchemaGroupStripper::StripFile(file, &new_file);
+
+    EnumScrubber enum_scrubber;
+    enum_scrubber.ScrubFile(&new_file);
+    ExtensionStripper::StripFile(&new_file);
+    FieldScrubber::ScrubFile(&new_file);
+    new_file.set_syntax("proto3");
+
+    string filename = file->name();
+    string basename = StripProto(filename);
+
+    std::vector<std::pair<string,string>> option_pairs;
+    ParseGeneratorParameter(parameter, &option_pairs);
+
+    std::unique_ptr<google::protobuf::io::ZeroCopyOutputStream> output(
+        context->Open(basename + ".proto"));
+    string content = GetPool()->BuildFile(new_file)->DebugString();
+    Printer printer(output.get(), '$');
+    printer.WriteRaw(content.c_str(), content.size());
+
+    return true;
+  }
+ private:
+  bool CanGenerate(const FileDescriptor* file) const {
+    if (GetPool()->FindFileByName(file->name()) != nullptr) {
+      return false;
+    }
+    for (int j = 0; j < file->dependency_count(); j++) {
+      if (GetPool()->FindFileByName(file->dependency(j)->name()) == nullptr) {
+        return false;
+      }
+    }
+    for (int j = 0; j < file->public_dependency_count(); j++) {
+      if (GetPool()->FindFileByName(
+          file->public_dependency(j)->name()) == nullptr) {
+        return false;
+      }
+    }
+    for (int j = 0; j < file->weak_dependency_count(); j++) {
+      if (GetPool()->FindFileByName(
+          file->weak_dependency(j)->name()) == nullptr) {
+        return false;
+      }
+    }
+    return true;
+  }
+};
+
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+
+int main(int argc, char* argv[]) {
+  google::protobuf::compiler::Proto2ToProto3Generator generator;
+  return google::protobuf::compiler::PluginMain(argc, argv, &generator);
+}
diff --git a/benchmarks/util/run_and_upload.py b/benchmarks/util/run_and_upload.py
new file mode 100755
index 00000000..ae22a668
--- /dev/null
+++ b/benchmarks/util/run_and_upload.py
@@ -0,0 +1,290 @@
+import argparse
+import os
+import re
+import copy
+import uuid
+import calendar
+import time
+import big_query_utils
+import datetime
+import json
+# This import depends on the automake rule protoc_middleman, please make sure
+# protoc_middleman has been built before run this file.
+import os.path, sys
+sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), os.pardir))
+import tmp.benchmarks_pb2 as benchmarks_pb2
+from click.types import STRING
+
+_PROJECT_ID = 'grpc-testing'
+_DATASET = 'protobuf_benchmark_result'
+_TABLE = 'opensource_result_v1'
+_NOW = "%d%02d%02d" % (datetime.datetime.now().year,
+                       datetime.datetime.now().month,
+                       datetime.datetime.now().day)
+
+file_size_map = {}
+
+def get_data_size(file_name):
+  if file_name in file_size_map:
+    return file_size_map[file_name]
+  benchmark_dataset = benchmarks_pb2.BenchmarkDataset()
+  benchmark_dataset.ParseFromString(
+      open(os.path.dirname(os.path.abspath(__file__)) + "/../" + file_name).read())
+  size = 0
+  count = 0
+  for payload in benchmark_dataset.payload:
+    size += len(payload)
+    count += 1
+  file_size_map[file_name] = (size, 1.0 * size / count)
+  return size, 1.0 * size / count
+
+
+def extract_file_name(file_name):
+  name_list = re.split("[/\.]", file_name)
+  short_file_name = ""
+  for name in name_list:
+    if name[:14] == "google_message":
+      short_file_name = name
+  return short_file_name
+
+
+cpp_result = []
+python_result = []
+java_result = []
+go_result = []
+
+
+# CPP results example:
+# [ 
+#   "benchmarks": [ 
+#     {
+#       "bytes_per_second": int,
+#       "cpu_time": int,
+#       "name: string,
+#       "time_unit: string,
+#       ...
+#     },
+#     ... 
+#   ],
+#   ... 
+# ]
+def parse_cpp_result(filename):
+  global cpp_result
+  if filename == "":
+    return
+  if filename[0] != '/':
+    filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
+  with open(filename) as f:
+    results = json.loads(f.read())
+    for benchmark in results["benchmarks"]:
+      data_filename = "".join(
+          re.split("(_parse_|_serialize)", benchmark["name"])[0])
+      behavior = benchmark["name"][len(data_filename) + 1:]
+      cpp_result.append({
+        "language": "cpp",
+        "dataFileName": data_filename,
+        "behavior": behavior,
+        "throughput": benchmark["bytes_per_second"] / 2.0 ** 20
+      })
+
+
+# Python results example:
+# [ 
+#   [ 
+#     {
+#       "filename": string,
+#       "benchmarks": {
+#         behavior: results, 
+#         ...
+#       },
+#       "message_name": STRING
+#     },
+#     ... 
+#   ], #pure-python
+#   ... 
+# ]
+def parse_python_result(filename):
+  global python_result
+  if filename == "":
+    return
+  if filename[0] != '/':
+    filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
+  with open(filename) as f:
+    results_list = json.loads(f.read())
+    for results in results_list:
+      for result in results:
+        _, avg_size = get_data_size(result["filename"])
+        for behavior in result["benchmarks"]:
+          python_result.append({
+            "language": "python",
+            "dataFileName": extract_file_name(result["filename"]),
+            "behavior": behavior,
+            "throughput": avg_size /
+                          result["benchmarks"][behavior] * 1e9 / 2 ** 20
+          })
+
+
+# Java results example:
+# [ 
+#   {
+#     "id": string,
+#     "instrumentSpec": {...},
+#     "measurements": [
+#       {
+#         "weight": float,
+#         "value": {
+#           "magnitude": float,
+#           "unit": string
+#         },
+#         ...
+#       },
+#       ...
+#     ],
+#     "run": {...},
+#     "scenario": {
+#       "benchmarkSpec": {
+#         "methodName": string,
+#         "parameters": {
+#            defined parameters in the benchmark: parameters value
+#         },
+#         ...
+#       },
+#       ...
+#     }
+#     
+#   }, 
+#   ... 
+# ]
+def parse_java_result(filename):
+  global average_bytes_per_message, java_result
+  if filename == "":
+    return
+  if filename[0] != '/':
+    filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
+  with open(filename) as f:
+    results = json.loads(f.read())
+    for result in results:
+      total_weight = 0
+      total_value = 0
+      for measurement in result["measurements"]:
+        total_weight += measurement["weight"]
+        total_value += measurement["value"]["magnitude"]
+      avg_time = total_value * 1.0 / total_weight
+      total_size, _ = get_data_size(
+          result["scenario"]["benchmarkSpec"]["parameters"]["dataFile"])
+      java_result.append({
+        "language": "java",
+        "throughput": total_size / avg_time * 1e9 / 2 ** 20,
+        "behavior": result["scenario"]["benchmarkSpec"]["methodName"],
+        "dataFileName": extract_file_name(
+            result["scenario"]["benchmarkSpec"]["parameters"]["dataFile"])
+      })
+
+
+# Go benchmark results:
+#
+# goos: linux
+# goarch: amd64
+# Benchmark/.././datasets/google_message2/dataset.google_message2.pb/Unmarshal-12               3000      705784 ns/op
+# Benchmark/.././datasets/google_message2/dataset.google_message2.pb/Marshal-12                 2000      634648 ns/op
+# Benchmark/.././datasets/google_message2/dataset.google_message2.pb/Size-12                    5000      244174 ns/op
+# Benchmark/.././datasets/google_message2/dataset.google_message2.pb/Clone-12                    300     4120954 ns/op
+# Benchmark/.././datasets/google_message2/dataset.google_message2.pb/Merge-12                    300     4108632 ns/op
+# PASS
+# ok    _/usr/local/google/home/yilunchong/mygit/protobuf/benchmarks  124.173s
+def parse_go_result(filename):
+  global go_result
+  if filename == "":
+    return
+  if filename[0] != '/':
+    filename = os.path.dirname(os.path.abspath(__file__)) + '/' + filename
+  with open(filename) as f:
+    for line in f:
+      result_list = re.split("[\ \t]+", line)
+      if result_list[0][:9] != "Benchmark":
+        continue
+      first_slash_index = result_list[0].find('/')
+      last_slash_index = result_list[0].rfind('/')
+      full_filename = result_list[0][first_slash_index+4:last_slash_index] # delete ../ prefix
+      total_bytes, _ = get_data_size(full_filename)
+      behavior_with_suffix = result_list[0][last_slash_index+1:]
+      last_dash = behavior_with_suffix.rfind("-")
+      if last_dash == -1:
+        behavior = behavior_with_suffix
+      else:
+        behavior = behavior_with_suffix[:last_dash]
+      go_result.append({
+        "dataFilename": extract_file_name(full_filename),
+        "throughput": total_bytes / float(result_list[2]) * 1e9 / 2 ** 20,
+        "behavior": behavior,
+        "language": "go"
+      })
+
+
+def get_metadata():
+  build_number = os.getenv('BUILD_NUMBER')
+  build_url = os.getenv('BUILD_URL')
+  job_name = os.getenv('JOB_NAME')
+  git_commit = os.getenv('GIT_COMMIT')
+  # actual commit is the actual head of PR that is getting tested
+  git_actual_commit = os.getenv('ghprbActualCommit')
+
+  utc_timestamp = str(calendar.timegm(time.gmtime()))
+  metadata = {'created': utc_timestamp}
+
+  if build_number:
+    metadata['buildNumber'] = build_number
+  if build_url:
+    metadata['buildUrl'] = build_url
+  if job_name:
+    metadata['jobName'] = job_name
+  if git_commit:
+    metadata['gitCommit'] = git_commit
+  if git_actual_commit:
+    metadata['gitActualCommit'] = git_actual_commit
+
+  return metadata
+
+
+def upload_result(result_list, metadata):
+  for result in result_list:
+    new_result = copy.deepcopy(result)
+    new_result['metadata'] = metadata
+    bq = big_query_utils.create_big_query()
+    row = big_query_utils.make_row(str(uuid.uuid4()), new_result)
+    if not big_query_utils.insert_rows(bq, _PROJECT_ID, _DATASET,
+                                       _TABLE + "$" + _NOW,
+                                       [row]):
+      print 'Error when uploading result', new_result
+
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser()
+  parser.add_argument("-cpp", "--cpp_input_file",
+                      help="The CPP benchmark result file's name",
+                      default="")
+  parser.add_argument("-java", "--java_input_file",
+                      help="The Java benchmark result file's name",
+                      default="")
+  parser.add_argument("-python", "--python_input_file",
+                      help="The Python benchmark result file's name",
+                      default="")
+  parser.add_argument("-go", "--go_input_file",
+                      help="The golang benchmark result file's name",
+                      default="")
+  args = parser.parse_args()
+
+  parse_cpp_result(args.cpp_input_file)
+  parse_python_result(args.python_input_file)
+  parse_java_result(args.java_input_file)
+  parse_go_result(args.go_input_file)
+
+  metadata = get_metadata()
+  print "uploading cpp results..."
+  upload_result(cpp_result, metadata)
+  print "uploading java results..."
+  upload_result(java_result, metadata)
+  print "uploading python results..."
+  upload_result(python_result, metadata)
+  print "uploading go results..."
+  upload_result(go_result, metadata)
diff --git a/benchmarks/util/schema_proto2_to_proto3_util.h b/benchmarks/util/schema_proto2_to_proto3_util.h
new file mode 100644
index 00000000..0079f6f1
--- /dev/null
+++ b/benchmarks/util/schema_proto2_to_proto3_util.h
@@ -0,0 +1,194 @@
+#ifndef PROTOBUF_BENCHMARKS_UTIL_SCHEMA_PROTO2_TO_PROTO3_UTIL_H_
+#define PROTOBUF_BENCHMARKS_UTIL_SCHEMA_PROTO2_TO_PROTO3_UTIL_H_
+
+#include "google/protobuf/message.h"
+#include "google/protobuf/descriptor.h"
+#include "google/protobuf/descriptor.pb.h"
+
+#include <sstream>
+#include <algorithm>
+
+using google::protobuf::Descriptor;
+using google::protobuf::DescriptorProto;
+using google::protobuf::FileDescriptorProto;
+using google::protobuf::FieldDescriptorProto;
+using google::protobuf::Message;
+using google::protobuf::EnumValueDescriptorProto;
+
+namespace google {
+namespace protobuf {
+namespace util {
+
+class SchemaGroupStripper {
+
+ public:
+  static void StripFile(const FileDescriptor* old_file,
+                        FileDescriptorProto *file) {
+    for (int i = file->mutable_message_type()->size() - 1; i >= 0; i--) {
+      if (IsMessageSet(old_file->message_type(i))) {
+        file->mutable_message_type()->DeleteSubrange(i, 1);
+        continue;
+      }
+      StripMessage(old_file->message_type(i), file->mutable_message_type(i));
+    }
+    for (int i = file->mutable_extension()->size() - 1; i >= 0; i--) {
+      auto field = old_file->extension(i);
+      if (field->type() == FieldDescriptor::TYPE_GROUP ||
+          IsMessageSet(field->message_type()) ||
+          IsMessageSet(field->containing_type())) {
+        file->mutable_extension()->DeleteSubrange(i, 1);
+      }
+    }
+  }
+
+ private:
+  static bool IsMessageSet(const Descriptor *descriptor) {
+    if (descriptor != nullptr
+        && descriptor->options().message_set_wire_format()) {
+      return true;
+    }
+    return false;
+  }
+
+  static void StripMessage(const Descriptor *old_message,
+                           DescriptorProto *new_message) {
+    for (int i = new_message->mutable_field()->size() - 1; i >= 0; i--) {
+      if (old_message->field(i)->type() == FieldDescriptor::TYPE_GROUP ||
+          IsMessageSet(old_message->field(i)->message_type())) {
+        new_message->mutable_field()->DeleteSubrange(i, 1);
+      }
+    }
+    for (int i = new_message->mutable_extension()->size() - 1; i >= 0; i--) {
+      auto field_type_name = new_message->mutable_extension(i)->type_name();
+      if (old_message->extension(i)->type() == FieldDescriptor::TYPE_GROUP ||
+          IsMessageSet(old_message->extension(i)->containing_type()) ||
+          IsMessageSet(old_message->extension(i)->message_type())) {
+        new_message->mutable_extension()->DeleteSubrange(i, 1);
+      }
+    }
+    for (int i = 0; i < new_message->mutable_nested_type()->size(); i++) {
+      StripMessage(old_message->nested_type(i),
+                   new_message->mutable_nested_type(i));
+    }
+  }
+
+};
+
+class EnumScrubber {
+
+ public:
+  EnumScrubber()
+      : total_added_(0) {
+  }
+
+  void ScrubFile(FileDescriptorProto *file) {
+    for (int i = 0; i < file->enum_type_size(); i++) {
+      ScrubEnum(file->mutable_enum_type(i));
+    }
+    for (int i = 0; i < file->mutable_message_type()->size(); i++) {
+      ScrubMessage(file->mutable_message_type(i));
+    }
+  }
+
+ private:
+  void ScrubEnum(EnumDescriptorProto *enum_type) {
+    if (enum_type->value(0).number() != 0) {
+      bool has_zero = false;
+      for (int j = 0; j < enum_type->value().size(); j++) {
+        if (enum_type->value(j).number() == 0) {
+          EnumValueDescriptorProto temp_enum_value;
+          temp_enum_value.CopyFrom(enum_type->value(j));
+          enum_type->mutable_value(j)->CopyFrom(enum_type->value(0));
+          enum_type->mutable_value(0)->CopyFrom(temp_enum_value);
+          has_zero = true;
+          break;
+        }
+      }
+      if (!has_zero) {
+        enum_type->mutable_value()->Add();
+        for (int i = enum_type->mutable_value()->size() - 1; i > 0; i--) {
+          enum_type->mutable_value(i)->CopyFrom(
+              *enum_type->mutable_value(i - 1));
+        }
+        enum_type->mutable_value(0)->set_number(0);
+        enum_type->mutable_value(0)->set_name("ADDED_ZERO_VALUE_" +
+                                              std::to_string(total_added_++));
+      }
+    }
+
+  }
+
+  void ScrubMessage(DescriptorProto *message_type) {
+    for (int i = 0; i < message_type->mutable_enum_type()->size(); i++) {
+      ScrubEnum(message_type->mutable_enum_type(i));
+    }
+    for (int i = 0; i < message_type->mutable_nested_type()->size(); i++) {
+      ScrubMessage(message_type->mutable_nested_type(i));
+    }
+  }
+
+  int total_added_;
+};
+
+class ExtensionStripper {
+ public:
+  static void StripFile(FileDescriptorProto *file) {
+    for (int i = 0; i < file->mutable_message_type()->size(); i++) {
+      StripMessage(file->mutable_message_type(i));
+    }
+    file->mutable_extension()->Clear();
+  }
+ private:
+  static void StripMessage(DescriptorProto *message_type) {
+    message_type->mutable_extension()->Clear();
+    message_type->clear_extension_range();
+    for (int i = 0; i < message_type->mutable_nested_type()->size(); i++) {
+      StripMessage(message_type->mutable_nested_type(i));
+    }
+  }
+};
+
+
+class FieldScrubber {
+ public:
+  static void ScrubFile(FileDescriptorProto *file) {
+    for (int i = 0; i < file->mutable_message_type()->size(); i++) {
+      ScrubMessage(file->mutable_message_type(i));
+    }
+    for (int i = 0; i < file->mutable_extension()->size(); i++) {
+      file->mutable_extension(i)->clear_default_value();
+      if (ShouldClearLabel(file->mutable_extension(i))) {
+        file->mutable_extension(i)->clear_label();
+      }
+    }
+  }
+ private:
+  static bool ShouldClearLabel(const FieldDescriptorProto *field) {
+    return field->label() == FieldDescriptorProto::LABEL_REQUIRED;
+  }
+
+  static void ScrubMessage(DescriptorProto *message_type) {
+    message_type->mutable_extension()->Clear();
+    for (int i = 0; i < message_type->mutable_extension()->size(); i++) {
+      message_type->mutable_extension(i)->clear_default_value();
+      if (ShouldClearLabel(message_type->mutable_extension(i))) {
+        message_type->mutable_extension(i)->clear_label();
+      }
+    }
+    for (int i = 0; i < message_type->mutable_field()->size(); i++) {
+      message_type->mutable_field(i)->clear_default_value();
+      if (ShouldClearLabel(message_type->mutable_field(i))) {
+        message_type->mutable_field(i)->clear_label();
+      }
+    }
+    for (int i = 0; i < message_type->mutable_nested_type()->size(); i++) {
+      ScrubMessage(message_type->mutable_nested_type(i));
+    }
+  }
+};
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // PROTOBUF_BENCHMARKS_UTIL_SCHEMA_PROTO2_TO_PROTO3_UTIL_H_
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 7618ba21..ece39f7f 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Minimum CMake required
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.1.3)
 
 if(protobuf_VERBOSE)
   message(STATUS "Protocol Buffers Configuring...")
@@ -7,13 +7,31 @@ endif()
 
 # CMake policies
 cmake_policy(SET CMP0022 NEW)
+# On MacOS use @rpath/ for target's install name prefix path
+if (POLICY CMP0042)
+  cmake_policy(SET CMP0042 NEW)
+endif ()
+# Clear VERSION variables when no VERSION is given to project()
+if(POLICY CMP0048)
+  cmake_policy(SET CMP0048 NEW)
+endif()
 
 # Project
 project(protobuf C CXX)
 
+# Add c++11 flags
+if (CYGWIN)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
+else()
+  set(CMAKE_CXX_STANDARD 11)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+  set(CMAKE_CXX_EXTENSIONS OFF)
+endif()
+
 # Options
 option(protobuf_BUILD_TESTS "Build tests" ON)
 option(protobuf_BUILD_EXAMPLES "Build examples" OFF)
+option(protobuf_BUILD_PROTOC_BINARIES "Build libprotoc and protoc compiler" ON)
 if (BUILD_SHARED_LIBS)
   set(protobuf_BUILD_SHARED_LIBS_DEFAULT ON)
 else (BUILD_SHARED_LIBS)
@@ -23,11 +41,7 @@ option(protobuf_BUILD_SHARED_LIBS "Build Shared Libraries" ${protobuf_BUILD_SHAR
 include(CMakeDependentOption)
 cmake_dependent_option(protobuf_MSVC_STATIC_RUNTIME "Link static runtime libraries" ON
   "NOT protobuf_BUILD_SHARED_LIBS" OFF)
-if (MSVC)
-  set(protobuf_WITH_ZLIB_DEFAULT OFF)
-else (MSVC)
-  set(protobuf_WITH_ZLIB_DEFAULT ON)
-endif (MSVC)
+set(protobuf_WITH_ZLIB_DEFAULT ON)
 option(protobuf_WITH_ZLIB "Build with zlib support" ${protobuf_WITH_ZLIB_DEFAULT})
 set(protobuf_DEBUG_POSTFIX "d"
   CACHE STRING "Default debug postfix")
@@ -135,14 +149,44 @@ endif (protobuf_BUILD_SHARED_LIBS)
 if (MSVC)
   # Build with multiple processes
   add_definitions(/MP)
-  add_definitions(/wd4244 /wd4267 /wd4018 /wd4355 /wd4800 /wd4251 /wd4996 /wd4146 /wd4305 /wd4309)
+  # MSVC warning suppressions
+  add_definitions(
+    /wd4018 # 'expression' : signed/unsigned mismatch
+    /wd4065 # switch statement contains 'default' but no 'case' labels
+    /wd4146 # unary minus operator applied to unsigned type, result still unsigned
+    /wd4244 # 'conversion' conversion from 'type1' to 'type2', possible loss of data
+    /wd4251 # 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'
+    /wd4267 # 'var' : conversion from 'size_t' to 'type', possible loss of data
+    /wd4305 # 'identifier' : truncation from 'type1' to 'type2'
+    /wd4307 # 'operator' : integral constant overflow
+    /wd4309 # 'conversion' : truncation of constant value
+    /wd4334 # 'operator' : result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
+    /wd4355 # 'this' : used in base member initializer list
+    /wd4506 # no definition for inline function 'function'
+    /wd4800 # 'type' : forcing value to bool 'true' or 'false' (performance warning)
+    /wd4996 # The compiler encountered a deprecated declaration.
+  )
   # Allow big object
   add_definitions(/bigobj)
   string(REPLACE "/" "\\" PROTOBUF_SOURCE_WIN32_PATH ${protobuf_SOURCE_DIR})
   string(REPLACE "/" "\\" PROTOBUF_BINARY_WIN32_PATH ${protobuf_BINARY_DIR})
+  string(REPLACE "." ","  protobuf_RC_FILEVERSION "${protobuf_VERSION}")
   configure_file(extract_includes.bat.in extract_includes.bat)
+
+  # Suppress linker warnings about files with no symbols defined.
+  set(CMAKE_STATIC_LINKER_FLAGS /ignore:4221)
+
+  # Configure Resource Compiler
+  enable_language(RC)
+  # use English language (0x409) in resource compiler
+  set(rc_flags "/l0x409")
+  # fix rc.exe invocations because of usage of add_definitions()
+  set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> ${rc_flags} <DEFINES> /fo<OBJECT> <SOURCE>")
+
+  configure_file(version.rc.in ${CMAKE_CURRENT_BINARY_DIR}/version.rc @ONLY)
 endif (MSVC)
 
+
 get_filename_component(protobuf_source_dir ${protobuf_SOURCE_DIR} PATH)
 
 include_directories(
@@ -165,8 +209,10 @@ endif (protobuf_UNICODE)
 
 include(libprotobuf-lite.cmake)
 include(libprotobuf.cmake)
-include(libprotoc.cmake)
-include(protoc.cmake)
+if (protobuf_BUILD_PROTOC_BINARIES)
+  include(libprotoc.cmake)
+  include(protoc.cmake)
+endif (protobuf_BUILD_PROTOC_BINARIES)
 
 if (protobuf_BUILD_TESTS)
   include(tests.cmake)
diff --git a/cmake/README.md b/cmake/README.md
index 1e7410d8..26a516c7 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -41,9 +41,16 @@ Good. Now you are ready to continue.
 Getting Sources
 ===============
 
-You can get the latest stable source packages from the
-[releases](https://github.com/google/protobuf/releases) page.
-Or you can type:
+You can get the latest stable source packages from the release page:
+
+    https://github.com/google/protobuf/releases/latest
+
+For example: if you only need C++, download `protobuf-cpp-[VERSION].tar.gz`; if
+you need C++ and Java, download `protobuf-java-[VERSION].tar.gz` (every package
+contains C++ source already); if you need C++ and multiple other languages,
+download `protobuf-all-[VERSION].tar.gz`.
+
+Or you can use git to clone from protobuf git repository.
 
      C:\Path\to> git clone -b [release_tag] https://github.com/google/protobuf.git
 
@@ -55,26 +62,16 @@ Go to the project folder:
      C:\Path\to>cd protobuf
      C:\Path\to\protobuf>
 
-Protobuf unit-tests require gmock to build. If you download protobuf source code
-from the *releases* page, the *gmock* directory should already be there. If you checkout
-the code via `git clone`, this *gmock* directory won't exist and you will have to
-download it manually or skip building protobuf unit-tests.
-
-You can download gmock as follows:
+Remember to update any submodules if you are using git clone (you can skip this
+step if you are using a release .tar.gz or .zip package):
 
-     C:\Path\to\protobuf>git clone -b release-1.7.0 https://github.com/google/googlemock.git gmock
-
-Then go to *gmock* folder and download gtest:
-
-     C:\Path\to\protobuf>cd gmock
-     C:\Path\to\protobuf\gmock>git clone -b release-1.7.0 https://github.com/google/googletest.git gtest
-
-If you absolutely don't want to build and run protobuf unit-tests, skip
-this steps and use protobuf at your own risk.
+```console
+C:\Path\to> git submodule update --init --recursive
+```
 
 Now go to *cmake* folder in protobuf sources:
 
-     C:\Path\to\protobuf\gmock>cd ..\cmake
+     C:\Path\to\protobuf>cd cmake
      C:\Path\to\protobuf\cmake>
 
 Good. Now you are ready to *CMake* configuration.
@@ -124,7 +121,7 @@ It will generate *nmake* *Makefile* in current directory.
 To create *Visual Studio* solution file:
 
      C:\Path\to\protobuf\cmake\build>mkdir solution & cd solution
-     C:\Path\to\protobuf\cmake\build\solution>cmake -G "Visual Studio 12 2013 Win64" ^
+     C:\Path\to\protobuf\cmake\build\solution>cmake -G "Visual Studio 14 2015 Win64" ^
      -DCMAKE_INSTALL_PREFIX=../../../../install ^
      ../..
 
@@ -302,6 +299,11 @@ further disable the option `-Dprotobuf_MSVC_STATIC_RUNTIME=OFF`.
 If it reports NOTFOUND for zlib_include or zlib_lib, you might haven't put
 the headers or the .lib file in the right directory.
 
+If you already have ZLIB library and headers at some other location on your system then alternatively you can define following configuration flags to locate them:
+
+	-DZLIB_INCLUDE_DIR=<path to dir containing zlib headers>
+	-DZLIB_LIB=<path to dir containing zlib>
+	
 Build and testing protobuf as usual.
 
 Notes on Compiler Warnings
diff --git a/cmake/extract_includes.bat.in b/cmake/extract_includes.bat.in
index 87cbc951..9fd9de0d 100644
--- a/cmake/extract_includes.bat.in
+++ b/cmake/extract_includes.bat.in
@@ -5,7 +5,6 @@ mkdir include\google\protobuf\compiler
 mkdir include\google\protobuf\compiler\cpp
 mkdir include\google\protobuf\compiler\csharp
 mkdir include\google\protobuf\compiler\java
-mkdir include\google\protobuf\compiler\javanano
 mkdir include\google\protobuf\compiler\js
 mkdir include\google\protobuf\compiler\objectivec
 mkdir include\google\protobuf\compiler\php
@@ -14,114 +13,113 @@ mkdir include\google\protobuf\compiler\ruby
 mkdir include\google\protobuf\io
 mkdir include\google\protobuf\stubs
 mkdir include\google\protobuf\util
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\any.h include\google\protobuf\any.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\any.pb.h include\google\protobuf\any.pb.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\api.pb.h include\google\protobuf\api.pb.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\arena.h include\google\protobuf\arena.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\arenastring.h include\google\protobuf\arenastring.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\code_generator.h include\google\protobuf\compiler\code_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\command_line_interface.h include\google\protobuf\compiler\command_line_interface.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\cpp\cpp_generator.h include\google\protobuf\compiler\cpp\cpp_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\csharp\csharp_generator.h include\google\protobuf\compiler\csharp\csharp_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\csharp\csharp_names.h include\google\protobuf\compiler\csharp\csharp_names.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\importer.h include\google\protobuf\compiler\importer.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\java\java_generator.h include\google\protobuf\compiler\java\java_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\java\java_names.h include\google\protobuf\compiler\java\java_names.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\javanano\javanano_generator.h include\google\protobuf\compiler\javanano\javanano_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\js\js_generator.h include\google\protobuf\compiler\js\js_generator.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\js\well_known_types_embed.h include\google\protobuf\compiler\js\well_known_types_embed.h
-copy ${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\objectivec\objectivec_generator.h include\google\protobuf\compiler\objectivec\objectivec_generator.h
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+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\util\message_differencer.h" include\google\protobuf\util\message_differencer.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\util\time_util.h" include\google\protobuf\util\time_util.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\util\type_resolver.h" include\google\protobuf\util\type_resolver.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\util\type_resolver_util.h" include\google\protobuf\util\type_resolver_util.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\wire_format.h" include\google\protobuf\wire_format.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\wire_format_lite.h" include\google\protobuf\wire_format_lite.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\wire_format_lite_inl.h" include\google\protobuf\wire_format_lite_inl.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\wrappers.pb.h" include\google\protobuf\wrappers.pb.h
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\any.proto" include\google\protobuf\any.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\api.proto" include\google\protobuf\api.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\compiler\plugin.proto" include\google\protobuf\compiler\plugin.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\descriptor.proto" include\google\protobuf\descriptor.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\duration.proto" include\google\protobuf\duration.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\empty.proto" include\google\protobuf\empty.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\field_mask.proto" include\google\protobuf\field_mask.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\source_context.proto" include\google\protobuf\source_context.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\struct.proto" include\google\protobuf\struct.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\timestamp.proto" include\google\protobuf\timestamp.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\type.proto" include\google\protobuf\type.proto
+copy "${PROTOBUF_SOURCE_WIN32_PATH}\..\src\google\protobuf\wrappers.proto" include\google\protobuf\wrappers.proto
diff --git a/cmake/install.cmake b/cmake/install.cmake
index 73e31984..9b2ae93c 100644
--- a/cmake/install.cmake
+++ b/cmake/install.cmake
@@ -1,37 +1,56 @@
 include(GNUInstallDirs)
 
-foreach(_library
-  libprotobuf-lite
-  libprotobuf
-  libprotoc)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/protobuf.pc.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/protobuf.pc @ONLY)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/protobuf-lite.pc.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/protobuf-lite.pc @ONLY)
+
+set(_protobuf_libraries libprotobuf-lite libprotobuf)
+if (protobuf_BUILD_PROTOC_BINARIES)
+    list(APPEND _protobuf_libraries libprotoc)
+endif (protobuf_BUILD_PROTOC_BINARIES)
+
+foreach(_library ${_protobuf_libraries})
   set_property(TARGET ${_library}
     PROPERTY INTERFACE_INCLUDE_DIRECTORIES
     $<BUILD_INTERFACE:${protobuf_source_dir}/src>
     $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+  if (UNIX AND NOT APPLE)
+    set_property(TARGET ${_library}
+      PROPERTY INSTALL_RPATH "$ORIGIN")
+  elseif (APPLE)
+    set_property(TARGET ${_library}
+      PROPERTY INSTALL_RPATH "@loader_path")
+  endif()
   install(TARGETS ${_library} EXPORT protobuf-targets
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${_library}
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT ${_library})
 endforeach()
 
-install(TARGETS protoc EXPORT protobuf-targets
-  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc)
+if (protobuf_BUILD_PROTOC_BINARIES)
+  install(TARGETS protoc EXPORT protobuf-targets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT protoc)
+  if (UNIX AND NOT APPLE)
+    set_property(TARGET protoc
+      PROPERTY INSTALL_RPATH "$ORIGIN/../lib")
+  elseif (APPLE)
+    set_property(TARGET protoc
+      PROPERTY INSTALL_RPATH "@loader_path/../lib")
+  endif()
+endif (protobuf_BUILD_PROTOC_BINARIES)
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/protobuf.pc ${CMAKE_CURRENT_BINARY_DIR}/protobuf-lite.pc DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 
 file(STRINGS extract_includes.bat.in _extract_strings
   REGEX "^copy")
 foreach(_extract_string ${_extract_strings})
-  string(REPLACE "copy \${PROTOBUF_SOURCE_WIN32_PATH}\\" ""
-    _extract_string ${_extract_string})
-  string(REPLACE "\\" "/" _extract_string ${_extract_string})
-  string(REGEX MATCH "^[^ ]+"
-    _extract_from ${_extract_string})
-  string(REGEX REPLACE "^${_extract_from} ([^$]+)" "\\1"
-    _extract_to ${_extract_string})
-  get_filename_component(_extract_from "${protobuf_SOURCE_DIR}/${_extract_from}" ABSOLUTE)
-  get_filename_component(_extract_name ${_extract_to} NAME)
-  get_filename_component(_extract_to ${_extract_to} PATH)
-  string(REPLACE "include/" "${CMAKE_INSTALL_INCLUDEDIR}/"
-    _extract_to "${_extract_to}")
+  string(REGEX REPLACE "^.* .+ include\\\\(.+)$" "\\1"
+    _header ${_extract_string})
+  string(REPLACE "\\" "/" _header ${_header})
+  get_filename_component(_extract_from "${protobuf_SOURCE_DIR}/../src/${_header}" ABSOLUTE)
+  get_filename_component(_extract_name ${_header} NAME)
+  get_filename_component(_extract_to "${CMAKE_INSTALL_INCLUDEDIR}/${_header}" PATH)
   if(EXISTS "${_extract_from}")
     install(FILES "${_extract_from}"
       DESTINATION "${_extract_to}"
@@ -100,10 +119,18 @@ configure_file(protobuf-options.cmake
   ${CMAKE_INSTALL_CMAKEDIR}/protobuf-options.cmake @ONLY)
 
 # Allows the build directory to be used as a find directory.
-export(TARGETS libprotobuf-lite libprotobuf libprotoc protoc
-  NAMESPACE protobuf::
-  FILE ${CMAKE_INSTALL_CMAKEDIR}/protobuf-targets.cmake
-)
+
+if (protobuf_BUILD_PROTOC_BINARIES)
+  export(TARGETS libprotobuf-lite libprotobuf libprotoc protoc
+    NAMESPACE protobuf::
+    FILE ${CMAKE_INSTALL_CMAKEDIR}/protobuf-targets.cmake
+  )
+else (protobuf_BUILD_PROTOC_BINARIES)
+  export(TARGETS libprotobuf-lite libprotobuf
+    NAMESPACE protobuf::
+    FILE ${CMAKE_INSTALL_CMAKEDIR}/protobuf-targets.cmake
+  )
+endif (protobuf_BUILD_PROTOC_BINARIES)
 
 install(EXPORT protobuf-targets
   DESTINATION "${CMAKE_INSTALL_CMAKEDIR}"
diff --git a/cmake/libprotobuf-lite.cmake b/cmake/libprotobuf-lite.cmake
index 036b0517..1d0b0b84 100644
--- a/cmake/libprotobuf-lite.cmake
+++ b/cmake/libprotobuf-lite.cmake
@@ -2,18 +2,18 @@ set(libprotobuf_lite_files
   ${protobuf_source_dir}/src/google/protobuf/arena.cc
   ${protobuf_source_dir}/src/google/protobuf/arenastring.cc
   ${protobuf_source_dir}/src/google/protobuf/extension_set.cc
+  ${protobuf_source_dir}/src/google/protobuf/generated_message_table_driven_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/generated_message_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/implicit_weak_message.cc
   ${protobuf_source_dir}/src/google/protobuf/io/coded_stream.cc
   ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream.cc
   ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/message_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/repeated_field.cc
-  ${protobuf_source_dir}/src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc
-  ${protobuf_source_dir}/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/bytestream.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/common.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/int128.cc
-  ${protobuf_source_dir}/src/google/protobuf/stubs/once.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/io_win32.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/status.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/statusor.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/stringpiece.cc
@@ -24,8 +24,38 @@ set(libprotobuf_lite_files
   ${protobuf_source_dir}/src/google/protobuf/wire_format_lite.cc
 )
 
+set(libprotobuf_lite_includes
+  ${protobuf_source_dir}/src/google/protobuf/arena.h
+  ${protobuf_source_dir}/src/google/protobuf/arenastring.h
+  ${protobuf_source_dir}/src/google/protobuf/extension_set.h
+  ${protobuf_source_dir}/src/google/protobuf/generated_message_util.h
+  ${protobuf_source_dir}/src/google/protobuf/implicit_weak_message.h
+  ${protobuf_source_dir}/src/google/protobuf/io/coded_stream.h
+  ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream.h
+  ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream_impl_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/message_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/repeated_field.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/bytestream.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/common.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/int128.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/once.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/status.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/statusor.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/stringpiece.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/stringprintf.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/strutil.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/time.h
+  ${protobuf_source_dir}/src/google/protobuf/wire_format_lite.h
+)
+
+if (MSVC)
+set(libprotobuf_lite_rc_files
+  ${CMAKE_CURRENT_BINARY_DIR}/version.rc
+)
+endif()
+
 add_library(libprotobuf-lite ${protobuf_SHARED_OR_STATIC}
-  ${libprotobuf_lite_files})
+  ${libprotobuf_lite_files} ${libprotobuf_lite_includes} ${libprotobuf_lite_rc_files})
 target_link_libraries(libprotobuf-lite ${CMAKE_THREAD_LIBS_INIT})
 target_include_directories(libprotobuf-lite PUBLIC ${protobuf_source_dir}/src)
 if(MSVC AND protobuf_BUILD_SHARED_LIBS)
@@ -34,5 +64,7 @@ if(MSVC AND protobuf_BUILD_SHARED_LIBS)
     PRIVATE LIBPROTOBUF_EXPORTS)
 endif()
 set_target_properties(libprotobuf-lite PROPERTIES
+    VERSION ${protobuf_VERSION}
     OUTPUT_NAME ${LIB_PREFIX}protobuf-lite
     DEBUG_POSTFIX "${protobuf_DEBUG_POSTFIX}")
+add_library(protobuf::libprotobuf-lite ALIAS libprotobuf-lite)
diff --git a/cmake/libprotobuf.cmake b/cmake/libprotobuf.cmake
index 26e1f356..bd570be7 100644
--- a/cmake/libprotobuf.cmake
+++ b/cmake/libprotobuf.cmake
@@ -13,6 +13,7 @@ set(libprotobuf_files
   ${protobuf_source_dir}/src/google/protobuf/extension_set_heavy.cc
   ${protobuf_source_dir}/src/google/protobuf/field_mask.pb.cc
   ${protobuf_source_dir}/src/google/protobuf/generated_message_reflection.cc
+  ${protobuf_source_dir}/src/google/protobuf/generated_message_table_driven.cc
   ${protobuf_source_dir}/src/google/protobuf/io/gzip_stream.cc
   ${protobuf_source_dir}/src/google/protobuf/io/printer.cc
   ${protobuf_source_dir}/src/google/protobuf/io/strtod.cc
@@ -30,6 +31,7 @@ set(libprotobuf_files
   ${protobuf_source_dir}/src/google/protobuf/timestamp.pb.cc
   ${protobuf_source_dir}/src/google/protobuf/type.pb.cc
   ${protobuf_source_dir}/src/google/protobuf/unknown_field_set.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/delimited_message_util.cc
   ${protobuf_source_dir}/src/google/protobuf/util/field_comparator.cc
   ${protobuf_source_dir}/src/google/protobuf/util/field_mask_util.cc
   ${protobuf_source_dir}/src/google/protobuf/util/internal/datapiece.cc
@@ -54,8 +56,70 @@ set(libprotobuf_files
   ${protobuf_source_dir}/src/google/protobuf/wrappers.pb.cc
 )
 
+set(libprotobuf_includes
+  ${protobuf_source_dir}/src/google/protobuf/any.h
+  ${protobuf_source_dir}/src/google/protobuf/any.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/api.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/importer.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/parser.h
+  ${protobuf_source_dir}/src/google/protobuf/descriptor.h
+  ${protobuf_source_dir}/src/google/protobuf/descriptor.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/descriptor_database.h
+  ${protobuf_source_dir}/src/google/protobuf/duration.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/dynamic_message.h
+  ${protobuf_source_dir}/src/google/protobuf/empty.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/field_mask.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/generated_message_reflection.h
+  ${protobuf_source_dir}/src/google/protobuf/io/gzip_stream.h
+  ${protobuf_source_dir}/src/google/protobuf/io/printer.h
+  ${protobuf_source_dir}/src/google/protobuf/io/strtod.h
+  ${protobuf_source_dir}/src/google/protobuf/io/tokenizer.h
+  ${protobuf_source_dir}/src/google/protobuf/io/zero_copy_stream_impl.h
+  ${protobuf_source_dir}/src/google/protobuf/map_field.h
+  ${protobuf_source_dir}/src/google/protobuf/message.h
+  ${protobuf_source_dir}/src/google/protobuf/reflection_ops.h
+  ${protobuf_source_dir}/src/google/protobuf/service.h
+  ${protobuf_source_dir}/src/google/protobuf/source_context.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/struct.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/mathlimits.h
+  ${protobuf_source_dir}/src/google/protobuf/stubs/substitute.h
+  ${protobuf_source_dir}/src/google/protobuf/text_format.h
+  ${protobuf_source_dir}/src/google/protobuf/timestamp.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/type.pb.h
+  ${protobuf_source_dir}/src/google/protobuf/unknown_field_set.h
+  ${protobuf_source_dir}/src/google/protobuf/util/delimited_message_util.h
+  ${protobuf_source_dir}/src/google/protobuf/util/field_comparator.h
+  ${protobuf_source_dir}/src/google/protobuf/util/field_mask_util.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/datapiece.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/default_value_objectwriter.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/error_listener.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/field_mask_utility.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/json_escaping.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/json_objectwriter.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/json_stream_parser.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/object_writer.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/proto_writer.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/protostream_objectsource.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/protostream_objectwriter.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/type_info.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/type_info_test_helper.h
+  ${protobuf_source_dir}/src/google/protobuf/util/internal/utility.h
+  ${protobuf_source_dir}/src/google/protobuf/util/json_util.h
+  ${protobuf_source_dir}/src/google/protobuf/util/message_differencer.h
+  ${protobuf_source_dir}/src/google/protobuf/util/time_util.h
+  ${protobuf_source_dir}/src/google/protobuf/util/type_resolver_util.h
+  ${protobuf_source_dir}/src/google/protobuf/wire_format.h
+  ${protobuf_source_dir}/src/google/protobuf/wrappers.pb.h
+)
+
+if (MSVC)
+set(libprotobuf_rc_files
+  ${CMAKE_CURRENT_BINARY_DIR}/version.rc
+)
+endif()
+
 add_library(libprotobuf ${protobuf_SHARED_OR_STATIC}
-  ${libprotobuf_lite_files} ${libprotobuf_files})
+  ${libprotobuf_lite_files} ${libprotobuf_files} ${libprotobuf_includes} ${libprotobuf_rc_files})
 target_link_libraries(libprotobuf ${CMAKE_THREAD_LIBS_INIT})
 if(protobuf_WITH_ZLIB)
     target_link_libraries(libprotobuf ${ZLIB_LIBRARIES})
@@ -67,5 +131,7 @@ if(MSVC AND protobuf_BUILD_SHARED_LIBS)
     PRIVATE LIBPROTOBUF_EXPORTS)
 endif()
 set_target_properties(libprotobuf PROPERTIES
+    VERSION ${protobuf_VERSION}
     OUTPUT_NAME ${LIB_PREFIX}protobuf
     DEBUG_POSTFIX "${protobuf_DEBUG_POSTFIX}")
+add_library(protobuf::libprotobuf ALIAS libprotobuf)
diff --git a/cmake/libprotoc.cmake b/cmake/libprotoc.cmake
index 215abcd8..92dfd306 100644
--- a/cmake/libprotoc.cmake
+++ b/cmake/libprotoc.cmake
@@ -11,6 +11,7 @@ set(libprotoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_map_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_message.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_message_field.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_primitive_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_service.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_string_field.cc
@@ -60,17 +61,6 @@ set(libprotoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_shared_code_generator.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_string_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_string_field_lite.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_enum.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_enum_field.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_extension.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_field.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_file.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_generator.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_helpers.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_map_field.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_message.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_message_field.cc
-  ${protobuf_source_dir}/src/google/protobuf/compiler/javanano/javanano_primitive_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/js/js_generator.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types_embed.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
@@ -94,20 +84,91 @@ set(libprotoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/zip_writer.cc
 )
 
-set(js_well_known_types_sources,
-  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/any.js
-  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/struct.js
-  ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types/timestamp.js
+set(libprotoc_headers
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_enum.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_enum_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_extension.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_file.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_helpers.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_map_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_message.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_message_layout_helper.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_options.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_primitive_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_service.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_string_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_doc_comment.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_enum.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_enum_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_field_base.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_helpers.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_map_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_message.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_options.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_reflection_class.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_source_generator_base.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_context.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_doc_comment.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_extension.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_extension_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_file.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_generator_factory.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_helpers.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_lazy_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_lazy_message_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_map_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_map_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message_builder.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message_builder_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_name_resolver.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_options.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_primitive_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_primitive_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_service.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_shared_code_generator.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_string_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_string_field_lite.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_enum.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_extension.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_file.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_message.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_message_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/subprocess.h
+  ${protobuf_source_dir}/src/google/protobuf/compiler/zip_writer.h
 )
-add_executable(js_embed ${protobuf_source_dir}/src/google/protobuf/compiler/js/embed.cc)
-add_custom_command(
-  OUTPUT ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types_embed.cc
-  DEPENDS js_embed ${js_well_known_types_sources}
-  COMMAND js_embed ${js_well_known_types_sources} > ${protobuf_source_dir}/src/google/protobuf/compiler/js/well_known_types_embed.cc
+
+if (MSVC)
+set(libprotoc_rc_files
+  ${CMAKE_CURRENT_BINARY_DIR}/version.rc
 )
+endif()
 
 add_library(libprotoc ${protobuf_SHARED_OR_STATIC}
-  ${libprotoc_files})
+  ${libprotoc_files} ${libprotoc_headers} ${libprotoc_rc_files})
 target_link_libraries(libprotoc libprotobuf)
 if(MSVC AND protobuf_BUILD_SHARED_LIBS)
   target_compile_definitions(libprotoc
@@ -116,5 +177,7 @@ if(MSVC AND protobuf_BUILD_SHARED_LIBS)
 endif()
 set_target_properties(libprotoc PROPERTIES
     COMPILE_DEFINITIONS LIBPROTOC_EXPORTS
+    VERSION ${protobuf_VERSION}
     OUTPUT_NAME ${LIB_PREFIX}protoc
     DEBUG_POSTFIX "${protobuf_DEBUG_POSTFIX}")
+add_library(protobuf::libprotoc ALIAS libprotoc)
diff --git a/cmake/protobuf-config-version.cmake.in b/cmake/protobuf-config-version.cmake.in
index 0036c9ef..3fa01763 100644
--- a/cmake/protobuf-config-version.cmake.in
+++ b/cmake/protobuf-config-version.cmake.in
@@ -17,39 +17,41 @@ endif()
 
 set(PACKAGE_VERSION_COMPATIBLE TRUE) #Assume true until shown otherwise
 
-if(NOT PACKAGE_FIND_VERSION_MAJOR EQUAL "@protobuf_VERSION_MAJOR@")
-  set(PACKAGE_VERSION_COMPATIBLE FALSE)
-elseif(PACKAGE_FIND_VERSION VERSION_GREATER PACKAGE_VERSION)
-  set(PACKAGE_VERSION_COMPATIBLE FALSE)
-elseif(PACKAGE_FIND_VERSION VERSION_EQUAL PACKAGE_VERSION)
-  # Do not match prerelease versions to non-prerelease version requests.
-  if(NOT "@protobuf_VERSION_PRERELEASE@" STREQUAL "" AND PACKAGE_FIND_VERSION_PRERELEASE STREQUAL "")
-    message(AUTHOR_WARNING "To use this prerelease version of ${PACKAGE_FIND_NAME}, set ${PACKAGE_FIND_NAME}_FIND_VERSION_PRERELEASE to '@protobuf_VERSION_PRERELEASE@' or greater.")
+if(PACKAGE_FIND_VERSION) #Only perform version checks if one is given
+  if(NOT PACKAGE_FIND_VERSION_MAJOR EQUAL "@protobuf_VERSION_MAJOR@")
     set(PACKAGE_VERSION_COMPATIBLE FALSE)
-  endif()
-
-  # Not robustly SemVer compliant, but protobuf never uses '.' separated prerelease identifiers.
-  if(PACKAGE_FIND_VERSION_PRERELEASE STRGREATER "@protobuf_VERSION_PRERELEASE@")
+  elseif(PACKAGE_FIND_VERSION VERSION_GREATER PACKAGE_VERSION)
     set(PACKAGE_VERSION_COMPATIBLE FALSE)
+  elseif(PACKAGE_FIND_VERSION VERSION_EQUAL PACKAGE_VERSION)
+    # Do not match prerelease versions to non-prerelease version requests.
+      if(NOT "@protobuf_VERSION_PRERELEASE@" STREQUAL "" AND PACKAGE_FIND_VERSION_PRERELEASE STREQUAL "")
+      message(AUTHOR_WARNING "To use this prerelease version of ${PACKAGE_FIND_NAME}, set ${PACKAGE_FIND_NAME}_FIND_VERSION_PRERELEASE to '@protobuf_VERSION_PRERELEASE@' or greater.")
+      set(PACKAGE_VERSION_COMPATIBLE FALSE)
+    endif()
+
+    # Not robustly SemVer compliant, but protobuf never uses '.' separated prerelease identifiers.
+    if(PACKAGE_FIND_VERSION_PRERELEASE STRGREATER "@protobuf_VERSION_PRERELEASE@")
+      set(PACKAGE_VERSION_COMPATIBLE FALSE)
+    endif()
   endif()
 endif()
 
 # Check and save build options used to create this package
 macro(_check_and_save_build_option OPTION VALUE)
   if(DEFINED ${PACKAGE_FIND_NAME}_${OPTION} AND
-    NOT ${PACKAGE_FIND_NAME}_${OPTION} EQUAL VALUE)
+    NOT ${PACKAGE_FIND_NAME}_${OPTION} STREQUAL ${VALUE})
     set(PACKAGE_VERSION_UNSUITABLE TRUE)
   endif()
-  set(${PACKAGE_FIND_NAME}_${OPTION} ${VALUE})
+  set(${PACKAGE_FIND_NAME}_${OPTION} ${VALUE} PARENT_SCOPE)
 endmacro()
 _check_and_save_build_option(WITH_ZLIB @protobuf_WITH_ZLIB@)
 _check_and_save_build_option(MSVC_STATIC_RUNTIME @protobuf_MSVC_STATIC_RUNTIME@)
 _check_and_save_build_option(BUILD_SHARED_LIBS @protobuf_BUILD_SHARED_LIBS@)
 
 # if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
-if(NOT "${CMAKE_SIZEOF_VOID_P}" STREQUAL "" AND NOT "@CMAKE_SIZEOF_VOID_P@" STREQUAL "")
+if(CMAKE_SIZEOF_VOID_P AND "@CMAKE_SIZEOF_VOID_P@")
   # check that the installed version has the same 32/64bit-ness as the one which is currently searching:
-  if(NOT CMAKE_SIZEOF_VOID_P STREQUAL "@CMAKE_SIZEOF_VOID_P@")
+  if(NOT CMAKE_SIZEOF_VOID_P EQUAL "@CMAKE_SIZEOF_VOID_P@")
     math(EXPR installedBits "@CMAKE_SIZEOF_VOID_P@ * 8")
     set(PACKAGE_VERSION "${PACKAGE_VERSION} (${installedBits}bit)")
     set(PACKAGE_VERSION_UNSUITABLE TRUE)
diff --git a/cmake/protobuf-config.cmake.in b/cmake/protobuf-config.cmake.in
index a044fe5c..3480c17c 100644
--- a/cmake/protobuf-config.cmake.in
+++ b/cmake/protobuf-config.cmake.in
@@ -7,6 +7,118 @@ include("${CMAKE_CURRENT_LIST_DIR}/protobuf-options.cmake")
 # Imported targets
 include("${CMAKE_CURRENT_LIST_DIR}/protobuf-targets.cmake")
 
+function(protobuf_generate)
+  include(CMakeParseArguments)
+
+  set(_options APPEND_PATH)
+  set(_singleargs LANGUAGE OUT_VAR EXPORT_MACRO PROTOC_OUT_DIR)
+  if(COMMAND target_sources)
+    list(APPEND _singleargs TARGET)
+  endif()
+  set(_multiargs PROTOS IMPORT_DIRS GENERATE_EXTENSIONS)
+
+  cmake_parse_arguments(protobuf_generate "${_options}" "${_singleargs}" "${_multiargs}" "${ARGN}")
+
+  if(NOT protobuf_generate_PROTOS AND NOT protobuf_generate_TARGET)
+    message(SEND_ERROR "Error: protobuf_generate called without any targets or source files")
+    return()
+  endif()
+
+  if(NOT protobuf_generate_OUT_VAR AND NOT protobuf_generate_TARGET)
+    message(SEND_ERROR "Error: protobuf_generate called without a target or output variable")
+    return()
+  endif()
+
+  if(NOT protobuf_generate_LANGUAGE)
+    set(protobuf_generate_LANGUAGE cpp)
+  endif()
+  string(TOLOWER ${protobuf_generate_LANGUAGE} protobuf_generate_LANGUAGE)
+
+  if(NOT protobuf_generate_PROTOC_OUT_DIR)
+    set(protobuf_generate_PROTOC_OUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
+  endif()
+  
+  if(protobuf_generate_EXPORT_MACRO AND protobuf_generate_LANGUAGE STREQUAL cpp)
+    set(_dll_export_decl "dllexport_decl=${protobuf_generate_EXPORT_MACRO}:")
+  endif()
+
+  if(NOT protobuf_generate_GENERATE_EXTENSIONS)
+    if(protobuf_generate_LANGUAGE STREQUAL cpp)
+      set(protobuf_generate_GENERATE_EXTENSIONS .pb.h .pb.cc)
+    elseif(protobuf_generate_LANGUAGE STREQUAL python)
+      set(protobuf_generate_GENERATE_EXTENSIONS _pb2.py)
+    else()
+      message(SEND_ERROR "Error: protobuf_generate given unknown Language ${LANGUAGE}, please provide a value for GENERATE_EXTENSIONS")
+      return()
+    endif()
+  endif()
+
+  if(protobuf_generate_TARGET)
+    get_target_property(_source_list ${protobuf_generate_TARGET} SOURCES)
+    foreach(_file ${_source_list})
+      if(_file MATCHES "proto$")
+        list(APPEND protobuf_generate_PROTOS ${_file})
+      endif()
+    endforeach()
+  endif()
+
+  if(NOT protobuf_generate_PROTOS)
+    message(SEND_ERROR "Error: protobuf_generate could not find any .proto files")
+    return()
+  endif()
+
+  if(protobuf_generate_APPEND_PATH)
+    # Create an include path for each file specified
+    foreach(_file ${protobuf_generate_PROTOS})
+      get_filename_component(_abs_file ${_file} ABSOLUTE)
+      get_filename_component(_abs_path ${_abs_file} PATH)
+      list(FIND _protobuf_include_path ${_abs_path} _contains_already)
+      if(${_contains_already} EQUAL -1)
+          list(APPEND _protobuf_include_path -I ${_abs_path})
+      endif()
+    endforeach()
+  else()
+    set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
+  endif()
+
+  foreach(DIR ${protobuf_generate_IMPORT_DIRS})
+    get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
+    list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
+    if(${_contains_already} EQUAL -1)
+        list(APPEND _protobuf_include_path -I ${ABS_PATH})
+    endif()
+  endforeach()
+
+  set(_generated_srcs_all)
+  foreach(_proto ${protobuf_generate_PROTOS})
+    get_filename_component(_abs_file ${_proto} ABSOLUTE)
+    get_filename_component(_basename ${_proto} NAME_WE)
+
+    set(_generated_srcs)
+    foreach(_ext ${protobuf_generate_GENERATE_EXTENSIONS})
+      list(APPEND _generated_srcs "${protobuf_generate_PROTOC_OUT_DIR}/${_basename}${_ext}")
+    endforeach()
+    list(APPEND _generated_srcs_all ${_generated_srcs})
+
+    add_custom_command(
+      OUTPUT ${_generated_srcs}
+      COMMAND  protobuf::protoc
+      ARGS --${protobuf_generate_LANGUAGE}_out ${_dll_export_decl}${protobuf_generate_PROTOC_OUT_DIR} ${_protobuf_include_path} ${_abs_file}
+      DEPENDS ${_abs_file} protobuf::protoc
+      COMMENT "Running ${protobuf_generate_LANGUAGE} protocol buffer compiler on ${_proto}"
+      VERBATIM )
+  endforeach()
+
+  set_source_files_properties(${_generated_srcs_all} PROPERTIES GENERATED TRUE)
+  if(protobuf_generate_OUT_VAR)
+    set(${protobuf_generate_OUT_VAR} ${_generated_srcs_all} PARENT_SCOPE)
+  endif()
+  if(protobuf_generate_TARGET)
+    target_sources(${protobuf_generate_TARGET} PRIVATE ${_generated_srcs_all})
+  endif()
+
+endfunction()
+
 # CMake FindProtobuf module compatible file
 if(protobuf_MODULE_COMPATIBLE)
   include("${CMAKE_CURRENT_LIST_DIR}/protobuf-module.cmake")
diff --git a/cmake/protobuf-lite.pc.cmake b/cmake/protobuf-lite.pc.cmake
new file mode 100644
index 00000000..cbe5426a
--- /dev/null
+++ b/cmake/protobuf-lite.pc.cmake
@@ -0,0 +1,11 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: Protocol Buffers
+Description: Google's Data Interchange Format
+Version: @protobuf_VERSION@
+Libs: -L${libdir} -lprotobuf-lite @CMAKE_THREAD_LIBS_INIT@
+Cflags: -I${includedir} @CMAKE_THREAD_LIBS_INIT@
+Conflicts: protobuf
diff --git a/cmake/protobuf-module.cmake.in b/cmake/protobuf-module.cmake.in
index 614e4c04..74c54887 100644
--- a/cmake/protobuf-module.cmake.in
+++ b/cmake/protobuf-module.cmake.in
@@ -1,55 +1,35 @@
+# This file contains backwards compatibility patches for various legacy functions and variables
 # Functions
 
 function(PROTOBUF_GENERATE_CPP SRCS HDRS)
-  if(NOT ARGN)
+  cmake_parse_arguments(protobuf_generate_cpp "" "EXPORT_MACRO" "" ${ARGN})
+
+  set(_proto_files "${protobuf_generate_cpp_UNPARSED_ARGUMENTS}")
+  if(NOT _proto_files)
     message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
     return()
   endif()
 
   if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
-    # Create an include path for each file specified
-    foreach(FIL ${ARGN})
-      get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
-      get_filename_component(ABS_PATH ${ABS_FIL} PATH)
-      list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
-      if(${_contains_already} EQUAL -1)
-          list(APPEND _protobuf_include_path -I ${ABS_PATH})
-      endif()
-    endforeach()
-  else()
-    set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
+    set(_append_arg APPEND_PATH)
   endif()
 
   if(DEFINED Protobuf_IMPORT_DIRS)
-    foreach(DIR ${Protobuf_IMPORT_DIRS})
-      get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
-      list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
-      if(${_contains_already} EQUAL -1)
-          list(APPEND _protobuf_include_path -I ${ABS_PATH})
-      endif()
-    endforeach()
+    set(_import_arg IMPORT_DIRS ${Protobuf_IMPORT_DIRS})
   endif()
 
+  set(_outvar)
+  protobuf_generate(${_append_arg} LANGUAGE cpp EXPORT_MACRO ${protobuf_generate_cpp_EXPORT_MACRO} OUT_VAR _outvar ${_import_arg} PROTOS ${_proto_files})
+
   set(${SRCS})
   set(${HDRS})
-  foreach(FIL ${ARGN})
-    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
-    get_filename_component(FIL_WE ${FIL} NAME_WE)
-
-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
-    list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
-
-    add_custom_command(
-      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
-             "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
-      COMMAND  ${Protobuf_PROTOC_EXECUTABLE}
-      ARGS --cpp_out  ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
-      DEPENDS ${ABS_FIL} ${Protobuf_PROTOC_EXECUTABLE}
-      COMMENT "Running C++ protocol buffer compiler on ${FIL}"
-      VERBATIM )
+  foreach(_file ${_outvar})
+    if(_file MATCHES "cc$")
+      list(APPEND ${SRCS} ${_file})
+    else()
+      list(APPEND ${HDRS} ${_file})
+    endif()
   endforeach()
-
-  set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
   set(${SRCS} ${${SRCS}} PARENT_SCOPE)
   set(${HDRS} ${${HDRS}} PARENT_SCOPE)
 endfunction()
@@ -61,44 +41,16 @@ function(PROTOBUF_GENERATE_PYTHON SRCS)
   endif()
 
   if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
-    # Create an include path for each file specified
-    foreach(FIL ${ARGN})
-      get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
-      get_filename_component(ABS_PATH ${ABS_FIL} PATH)
-      list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
-      if(${_contains_already} EQUAL -1)
-          list(APPEND _protobuf_include_path -I ${ABS_PATH})
-      endif()
-    endforeach()
-  else()
-    set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
+    set(_append_arg APPEND_PATH)
   endif()
 
   if(DEFINED Protobuf_IMPORT_DIRS)
-    foreach(DIR ${Protobuf_IMPORT_DIRS})
-      get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
-      list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
-      if(${_contains_already} EQUAL -1)
-          list(APPEND _protobuf_include_path -I ${ABS_PATH})
-      endif()
-    endforeach()
+    set(_import_arg IMPORT_DIRS ${Protobuf_IMPORT_DIRS})
   endif()
 
-  set(${SRCS})
-  foreach(FIL ${ARGN})
-    get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
-    get_filename_component(FIL_WE ${FIL} NAME_WE)
-
-    list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}_pb2.py")
-    add_custom_command(
-      OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}_pb2.py"
-      COMMAND  ${Protobuf_PROTOC_EXECUTABLE} --python_out ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
-      DEPENDS ${ABS_FIL} ${Protobuf_PROTOC_EXECUTABLE}
-      COMMENT "Running Python protocol buffer compiler on ${FIL}"
-      VERBATIM )
-  endforeach()
-
-  set(${SRCS} ${${SRCS}} PARENT_SCOPE)
+  set(_outvar)
+  protobuf_generate(${_append_arg} LANGUAGE python OUT_VAR _outvar ${_import_arg} PROTOS ${ARGN})
+  set(${SRCS} ${_outvar} PARENT_SCOPE)
 endfunction()
 
 # Environment
@@ -198,6 +150,10 @@ if(NOT EXISTS "${Protobuf_PROTOC_EXECUTABLE}")
   get_target_property(Protobuf_PROTOC_EXECUTABLE protobuf::protoc
     IMPORTED_LOCATION_DEBUG)
 endif()
+if(NOT EXISTS "${Protobuf_PROTOC_EXECUTABLE}")
+  get_target_property(Protobuf_PROTOC_EXECUTABLE protobuf::protoc
+    IMPORTED_LOCATION_NOCONFIG)
+endif()
 
 # Version info variable
 set(Protobuf_VERSION "@protobuf_VERSION@")
diff --git a/cmake/protobuf.pc.cmake b/cmake/protobuf.pc.cmake
new file mode 100644
index 00000000..d33e98cc
--- /dev/null
+++ b/cmake/protobuf.pc.cmake
@@ -0,0 +1,11 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=@CMAKE_INSTALL_PREFIX@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+
+Name: Protocol Buffers
+Description: Google's Data Interchange Format
+Version: @protobuf_VERSION@
+Libs: -L${libdir} -lprotobuf @CMAKE_THREAD_LIBS_INIT@
+Cflags: -I${includedir} @CMAKE_THREAD_LIBS_INIT@
+Conflicts: protobuf-lite
diff --git a/cmake/protoc.cmake b/cmake/protoc.cmake
index 4f07c389..bb160f47 100644
--- a/cmake/protoc.cmake
+++ b/cmake/protoc.cmake
@@ -2,5 +2,15 @@ set(protoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/main.cc
 )
 
-add_executable(protoc ${protoc_files})
+if (MSVC)
+set(protoc_rc_files
+  ${CMAKE_CURRENT_BINARY_DIR}/version.rc
+)
+endif()
+
+add_executable(protoc ${protoc_files} ${protoc_rc_files})
 target_link_libraries(protoc libprotobuf libprotoc)
+add_executable(protobuf::protoc ALIAS protoc)
+
+set_target_properties(protoc PROPERTIES
+    VERSION ${protobuf_VERSION})
diff --git a/cmake/tests.cmake b/cmake/tests.cmake
index 1d3be71f..f91567b8 100644
--- a/cmake/tests.cmake
+++ b/cmake/tests.cmake
@@ -1,23 +1,31 @@
-if (NOT EXISTS "${PROJECT_SOURCE_DIR}/../gmock/CMakeLists.txt")
-  message(FATAL_ERROR "Cannot find gmock directory.")
+if (NOT EXISTS "${PROJECT_SOURCE_DIR}/../third_party/googletest/CMakeLists.txt")
+  message(FATAL_ERROR
+          "Cannot find third_party/googletest directory that's needed to "
+          "build tests. If you use git, make sure you have cloned submodules:\n"
+          "  git submodule update --init --recursive\n"
+          "If instead you want to skip tests, run cmake with:\n"
+          "  cmake -Dprotobuf_BUILD_TESTS=OFF\n")
 endif()
 
 option(protobuf_ABSOLUTE_TEST_PLUGIN_PATH
   "Using absolute test_plugin path in tests" ON)
 mark_as_advanced(protobuf_ABSOLUTE_TEST_PLUGIN_PATH)
 
+set(googlemock_source_dir "${protobuf_source_dir}/third_party/googletest/googlemock")
+set(googletest_source_dir "${protobuf_source_dir}/third_party/googletest/googletest")
 include_directories(
-  ${protobuf_source_dir}/gmock
-  ${protobuf_source_dir}/gmock/gtest
-  ${protobuf_source_dir}/gmock/gtest/include
-  ${protobuf_source_dir}/gmock/include
+  ${googlemock_source_dir}
+  ${googletest_source_dir}
+  ${googletest_source_dir}/include
+  ${googlemock_source_dir}/include
 )
 
 add_library(gmock STATIC
-  ${protobuf_source_dir}/gmock/src/gmock-all.cc
-  ${protobuf_source_dir}/gmock/gtest/src/gtest-all.cc
+  "${googlemock_source_dir}/src/gmock-all.cc"
+  "${googletest_source_dir}/src/gtest-all.cc"
 )
-add_library(gmock_main STATIC ${protobuf_source_dir}/gmock/src/gmock_main.cc)
+target_link_libraries(gmock ${CMAKE_THREAD_LIBS_INIT})
+add_library(gmock_main STATIC "${googlemock_source_dir}/src/gmock_main.cc")
 target_link_libraries(gmock_main gmock)
 
 set(lite_test_protos
@@ -42,6 +50,9 @@ set(tests_protos
   google/protobuf/unittest_empty.proto
   google/protobuf/unittest_import.proto
   google/protobuf/unittest_import_public.proto
+  google/protobuf/unittest_lazy_dependencies.proto
+  google/protobuf/unittest_lazy_dependencies_custom_option.proto
+  google/protobuf/unittest_lazy_dependencies_enum.proto
   google/protobuf/unittest_lite_imports_nonlite.proto
   google/protobuf/unittest_mset.proto
   google/protobuf/unittest_mset_wire_format.proto
@@ -103,6 +114,7 @@ set(common_test_files
   ${protobuf_source_dir}/src/google/protobuf/arena_test_util.cc
   ${protobuf_source_dir}/src/google/protobuf/map_test_util.cc
   ${protobuf_source_dir}/src/google/protobuf/test_util.cc
+  ${protobuf_source_dir}/src/google/protobuf/test_util.inc
   ${protobuf_source_dir}/src/google/protobuf/testing/file.cc
   ${protobuf_source_dir}/src/google/protobuf/testing/googletest.cc
 )
@@ -117,10 +129,13 @@ set(tests_files
   ${protobuf_source_dir}/src/google/protobuf/any_test.cc
   ${protobuf_source_dir}/src/google/protobuf/arena_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/arenastring_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/annotation_test_util.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/command_line_interface_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_move_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_unittest.inc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/metadata_test.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_generator_unittest.cc
@@ -145,6 +160,7 @@ set(tests_files
   ${protobuf_source_dir}/src/google/protobuf/map_field_test.cc
   ${protobuf_source_dir}/src/google/protobuf/map_test.cc
   ${protobuf_source_dir}/src/google/protobuf/message_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/message_unittest.inc
   ${protobuf_source_dir}/src/google/protobuf/no_field_presence_test.cc
   ${protobuf_source_dir}/src/google/protobuf/preserve_unknown_enum_test.cc
   ${protobuf_source_dir}/src/google/protobuf/proto3_arena_lite_unittest.cc
@@ -156,7 +172,7 @@ set(tests_files
   ${protobuf_source_dir}/src/google/protobuf/stubs/bytestream_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/common_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/int128_unittest.cc
-  ${protobuf_source_dir}/src/google/protobuf/stubs/once_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/stubs/io_win32_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/status_test.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/statusor_test.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/stringpiece_unittest.cc
@@ -165,9 +181,9 @@ set(tests_files
   ${protobuf_source_dir}/src/google/protobuf/stubs/strutil_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/template_util_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/stubs/time_test.cc
-  ${protobuf_source_dir}/src/google/protobuf/stubs/type_traits_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/text_format_unittest.cc
   ${protobuf_source_dir}/src/google/protobuf/unknown_field_set_unittest.cc
+  ${protobuf_source_dir}/src/google/protobuf/util/delimited_message_util_test.cc
   ${protobuf_source_dir}/src/google/protobuf/util/field_comparator_test.cc
   ${protobuf_source_dir}/src/google/protobuf/util/field_mask_util_test.cc
   ${protobuf_source_dir}/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
@@ -188,6 +204,10 @@ if(protobuf_ABSOLUTE_TEST_PLUGIN_PATH)
   add_compile_options(-DGOOGLE_PROTOBUF_TEST_PLUGIN_PATH="$<TARGET_FILE:test_plugin>")
 endif()
 
+if(MINGW)
+  set_source_files_properties(${tests_files} PROPERTIES COMPILE_FLAGS "-Wno-narrowing")
+endif()
+
 add_executable(tests ${tests_files} ${common_test_files} ${tests_proto_files} ${lite_test_proto_files})
 target_link_libraries(tests libprotoc libprotobuf gmock_main)
 
@@ -205,7 +225,7 @@ set(lite_test_files
   ${protobuf_source_dir}/src/google/protobuf/lite_unittest.cc
 )
 add_executable(lite-test ${lite_test_files} ${common_lite_test_files} ${lite_test_proto_files})
-target_link_libraries(lite-test libprotobuf-lite)
+target_link_libraries(lite-test libprotobuf-lite gmock_main)
 
 set(lite_arena_test_files
   ${protobuf_source_dir}/src/google/protobuf/lite_arena_unittest.cc
diff --git a/cmake/version.rc.in b/cmake/version.rc.in
new file mode 100644
index 00000000..cbce1e53
--- /dev/null
+++ b/cmake/version.rc.in
@@ -0,0 +1,45 @@
+#define VS_FF_DEBUG 0x1L
+#define VS_VERSION_INFO 0x1L
+#define VS_FFI_FILEFLAGSMASK 0x17L
+#define VER_PRIVATEBUILD 0x0L
+#define VER_PRERELEASE 0x0L
+#define VOS__WINDOWS32 0x4L
+#define VFT_DLL 0x2L
+#define VFT2_UNKNOWN 0x0L
+
+#ifndef DEBUG
+#define VER_DEBUG 0
+#else
+#define VER_DEBUG VS_FF_DEBUG
+#endif
+
+
+VS_VERSION_INFO VERSIONINFO
+  FILEVERSION    @protobuf_RC_FILEVERSION@,0
+  PRODUCTVERSION @protobuf_RC_FILEVERSION@,0
+  FILEFLAGSMASK  VS_FFI_FILEFLAGSMASK
+  FILEFLAGS      VER_DEBUG
+  FILEOS         VOS__WINDOWS32
+  FILETYPE       VFT_DLL
+BEGIN
+    BLOCK "VarFileInfo"
+    BEGIN 
+        // English language (0x409) and the Windows Unicode codepage (1200)
+        VALUE "Translation", 0x409, 1200
+    END
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "FileDescription", "Compiled with @CMAKE_CXX_COMPILER_ID@ @CMAKE_CXX_COMPILER_VERSION@\0"
+            VALUE "ProductVersion", "@protobuf_VERSION@\0"
+            VALUE "FileVersion", "@protobuf_VERSION@\0"
+            VALUE "InternalName", "protobuf\0"
+            VALUE "ProductName", "Protocol Buffers - Google's Data Interchange Format\0"
+            VALUE "CompanyName", "Google Inc.\0"
+            VALUE "LegalCopyright", "Copyright 2008 Google Inc.  All rights reserved.\0"
+            VALUE "Licence", "BSD\0"
+            VALUE "Info", "https://developers.google.com/protocol-buffers/\0"
+        END
+    END
+END
diff --git a/composer.json b/composer.json
index 2b04e079..2c64ad22 100644
--- a/composer.json
+++ b/composer.json
@@ -11,13 +11,13 @@
   "require-dev": {
     "phpunit/phpunit": ">=4.8.0"
   },
+  "suggest": {
+    "ext-bcmath": "Need to support JSON deserialization"
+  },
   "autoload": {
     "psr-4": {
-      "Google\\Protobuf\\Internal\\": "php/src/Google/Protobuf/Internal",
-      "GPBMetadata\\Google\\Protobuf\\Internal\\": "php/src/GPBMetadata/Google/Protobuf/Internal"
-    },
-    "files": [
-      "php/src/Google/Protobuf/descriptor.php"
-    ]
+      "Google\\Protobuf\\": "php/src/Google/Protobuf",
+      "GPBMetadata\\Google\\Protobuf\\": "php/src/GPBMetadata/Google/Protobuf"
+    }
   }
 }
diff --git a/configure.ac b/configure.ac
index 6d9c2a01..634c0a69 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,7 +17,7 @@ AC_PREREQ(2.59)
 # In the SVN trunk, the version should always be the next anticipated release
 # version with the "-pre" suffix.  (We used to use "-SNAPSHOT" but this pushed
 # the size of one file name in the dist tarfile over the 99-char limit.)
-AC_INIT([Protocol Buffers],[3.2.0],[protobuf@googlegroups.com],[protobuf])
+AC_INIT([Protocol Buffers],[3.5.2],[protobuf@googlegroups.com],[protobuf])
 
 AM_MAINTAINER_MODE([enable])
 
@@ -52,6 +52,16 @@ AC_ARG_WITH([zlib],
     [include classes for streaming compressed data in and out @<:@default=check@:>@])],
   [],[with_zlib=check])
 
+AC_ARG_WITH([zlib-include],
+  [AS_HELP_STRING([--with-zlib-include=PATH],
+    [zlib include directory])],
+  [CPPFLAGS="-I$withval $CPPFLAGS"])
+
+AC_ARG_WITH([zlib-lib],
+  [AS_HELP_STRING([--with-zlib-lib=PATH],
+    [zlib lib directory])],
+  [LDFLAGS="-L$withval $LDFLAGS"])
+
 AC_ARG_WITH([protoc],
   [AS_HELP_STRING([--with-protoc=COMMAND],
     [use the given protoc command instead of building a new one when building tests (useful for cross-compiling)])],
@@ -78,7 +88,7 @@ AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
   # Protocol Buffers contains several checks that are intended to be used only
   # for debugging and which might hurt performance.  Most users are probably
   # end users who don't want these checks, so add -DNDEBUG by default.
-  CXXFLAGS="$CXXFLAGS -DNDEBUG"
+  CXXFLAGS="$CXXFLAGS -std=c++11 -DNDEBUG"
 
   AC_MSG_RESULT([use default: $PROTOBUF_OPT_FLAG $CXXFLAGS])
 ],[
@@ -93,6 +103,25 @@ ACX_CHECK_SUNCC
 # to the link
 AC_PROG_LIBTOOL
 
+# Check whether the linker supports version scripts
+AC_MSG_CHECKING([whether the linker supports version scripts])
+save_LDFLAGS=$LDFLAGS
+LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+cat > conftest.map <<EOF
+{
+  global:
+    main;
+  local:
+    *;
+};
+EOF
+AC_LINK_IFELSE(
+  [AC_LANG_SOURCE([int main() { return 0; }])],
+  [have_ld_version_script=yes; AC_MSG_RESULT(yes)],
+  [have_ld_version_script=no; AC_MSG_RESULT(no)])
+LDFLAGS=$save_LDFLAGS
+AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT], [test "$have_ld_version_script" == "yes"])
+
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stdlib.h unistd.h])
@@ -155,14 +184,13 @@ AS_IF([test "$with_protoc" != "no"], [
 ])
 AM_CONDITIONAL([USE_EXTERNAL_PROTOC], [test "$with_protoc" != "no"])
 
-ACX_PTHREAD
-AM_CONDITIONAL([HAVE_PTHREAD], [test "x$acx_pthread_ok" = "xyes"])
-
+AX_PTHREAD
+AM_CONDITIONAL([HAVE_PTHREAD], [test "x$ax_pthread_ok" = "xyes"])
 # We still keep this for improving pbconfig.h for unsupported platforms.
 AC_CXX_STL_HASH
 
 case "$target_os" in
-  mingw* | cygwin* | win*)
+  mingw* | cygwin* | win* | aix* | *android* )
     ;;
   *)
     # Need to link against rt on Solaris
@@ -179,14 +207,14 @@ case "$target_os" in
 esac
 AM_CONDITIONAL([OBJC_CONFORMANCE_TEST], [test $OBJC_CONFORMANCE_TEST = 1])
 
-AX_CXX_COMPILE_STDCXX([11], [noext], [optional])
+AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
 
 # HACK:  Make gmock's configure script pick up our copy of CFLAGS and CXXFLAGS,
 #   since the flags added by ACX_CHECK_SUNCC must be used when compiling gmock
 #   too.
 export CFLAGS
 export CXXFLAGS
-AC_CONFIG_SUBDIRS([gmock])
+AC_CONFIG_SUBDIRS([third_party/googletest])
 
 AC_CONFIG_FILES([Makefile src/Makefile benchmarks/Makefile conformance/Makefile protobuf.pc protobuf-lite.pc])
 AC_OUTPUT
diff --git a/conformance/ConformanceJava.java b/conformance/ConformanceJava.java
index 7badf2a5..596d113a 100644
--- a/conformance/ConformanceJava.java
+++ b/conformance/ConformanceJava.java
@@ -1,12 +1,18 @@
 import com.google.protobuf.ByteString;
+import com.google.protobuf.AbstractMessage;
+import com.google.protobuf.Parser;
 import com.google.protobuf.CodedInputStream;
 import com.google.protobuf.conformance.Conformance;
 import com.google.protobuf.InvalidProtocolBufferException;
 import com.google.protobuf_test_messages.proto3.TestMessagesProto3;
+import com.google.protobuf_test_messages.proto3.TestMessagesProto3.TestAllTypesProto3;
+import com.google.protobuf_test_messages.proto2.TestMessagesProto2;
+import com.google.protobuf_test_messages.proto2.TestMessagesProto2.TestAllTypesProto2;
+import com.google.protobuf.ExtensionRegistry;
 import com.google.protobuf.util.JsonFormat;
 import com.google.protobuf.util.JsonFormat.TypeRegistry;
-import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.util.ArrayList;
 
 class ConformanceJava {
   private int testCount = 0;
@@ -50,123 +56,100 @@ class ConformanceJava {
     buf[3] = (byte)(val >> 24);
     writeToStdout(buf);
   }
+  
+  private enum BinaryDecoderType {
+    BTYE_STRING_DECODER,
+    BYTE_ARRAY_DECODER,
+    ARRAY_BYTE_BUFFER_DECODER,
+    READONLY_ARRAY_BYTE_BUFFER_DECODER,
+    DIRECT_BYTE_BUFFER_DECODER,
+    READONLY_DIRECT_BYTE_BUFFER_DECODER,
+    INPUT_STREAM_DECODER;
+  }
 
-  private enum BinaryDecoder {
-    BYTE_STRING_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        return TestMessagesProto3.TestAllTypes.parseFrom(bytes);
-      }
-    },
-    BYTE_ARRAY_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        return TestMessagesProto3.TestAllTypes.parseFrom(bytes.toByteArray());
-      }
-    },
-    ARRAY_BYTE_BUFFER_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        ByteBuffer buffer = ByteBuffer.allocate(bytes.size());
-        bytes.copyTo(buffer);
-        buffer.flip();
-        try {
-          return TestMessagesProto3.TestAllTypes.parseFrom(CodedInputStream.newInstance(buffer));
-        } catch (InvalidProtocolBufferException e) {
-          throw e;
-        } catch (IOException e) {
-          throw new RuntimeException(
-              "ByteString based ByteBuffer should not throw IOException.", e);
-        }
-      }
-    },
-    READONLY_ARRAY_BYTE_BUFFER_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        try {
-          return TestMessagesProto3.TestAllTypes.parseFrom(
-              CodedInputStream.newInstance(bytes.asReadOnlyByteBuffer()));
-        } catch (InvalidProtocolBufferException e) {
-          throw e;
-        } catch (IOException e) {
-          throw new RuntimeException(
-              "ByteString based ByteBuffer should not throw IOException.", e);
+  private static class BinaryDecoder <MessageType extends AbstractMessage> {
+    public MessageType decode (ByteString bytes, BinaryDecoderType type, 
+        Parser <MessageType> parser, ExtensionRegistry extensions)
+      throws InvalidProtocolBufferException {
+      switch (type) {
+        case BTYE_STRING_DECODER: 
+          return parser.parseFrom(bytes, extensions);
+        case BYTE_ARRAY_DECODER:
+          return parser.parseFrom(bytes.toByteArray(), extensions);
+        case ARRAY_BYTE_BUFFER_DECODER: {
+          ByteBuffer buffer = ByteBuffer.allocate(bytes.size());
+          bytes.copyTo(buffer);
+          buffer.flip();
+          try {
+            return parser.parseFrom(CodedInputStream.newInstance(buffer), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            throw e;
+          }
         }
-      }
-    },
-    DIRECT_BYTE_BUFFER_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        ByteBuffer buffer = ByteBuffer.allocateDirect(bytes.size());
-        bytes.copyTo(buffer);
-        buffer.flip();
-        try {
-          return TestMessagesProto3.TestAllTypes.parseFrom(CodedInputStream.newInstance(buffer));
-        } catch (InvalidProtocolBufferException e) {
-          throw e;
-        } catch (IOException e) {
-          throw new RuntimeException(
-              "ByteString based ByteBuffer should not throw IOException.", e);
+        case READONLY_ARRAY_BYTE_BUFFER_DECODER: {
+          try {
+            return parser.parseFrom(
+                CodedInputStream.newInstance(bytes.asReadOnlyByteBuffer()), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            throw e;
+          }
+        } 
+        case DIRECT_BYTE_BUFFER_DECODER: {
+          ByteBuffer buffer = ByteBuffer.allocateDirect(bytes.size());
+          bytes.copyTo(buffer);
+          buffer.flip();
+          try {
+            return parser.parseFrom(CodedInputStream.newInstance(buffer), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            throw e;
+          }
         }
-      }
-    },
-    READONLY_DIRECT_BYTE_BUFFER_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        ByteBuffer buffer = ByteBuffer.allocateDirect(bytes.size());
-        bytes.copyTo(buffer);
-        buffer.flip();
-        try {
-          return TestMessagesProto3.TestAllTypes.parseFrom(
-              CodedInputStream.newInstance(buffer.asReadOnlyBuffer()));
-        } catch (InvalidProtocolBufferException e) {
-          throw e;
-        } catch (IOException e) {
-          throw new RuntimeException(
-              "ByteString based ByteBuffer should not throw IOException.", e);
+        case READONLY_DIRECT_BYTE_BUFFER_DECODER: {
+          ByteBuffer buffer = ByteBuffer.allocateDirect(bytes.size());
+          bytes.copyTo(buffer);
+          buffer.flip();
+          try {
+            return parser.parseFrom(
+                CodedInputStream.newInstance(buffer.asReadOnlyBuffer()), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            throw e;
+          }
         }
-      }
-    },
-    INPUT_STREAM_DECODER() {
-      @Override
-      public TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-          throws InvalidProtocolBufferException {
-        try {
-          return TestMessagesProto3.TestAllTypes.parseFrom(bytes.newInput());
-        } catch (InvalidProtocolBufferException e) {
-          throw e;
-        } catch (IOException e) {
-          throw new RuntimeException(
-              "ByteString based InputStream should not throw IOException.", e);
+        case INPUT_STREAM_DECODER: {
+          try {
+            return parser.parseFrom(bytes.newInput(), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            throw e;
+          }
         }
+        default :
+          return null;
       }
-    };
-
-    public abstract TestMessagesProto3.TestAllTypes parse(ByteString bytes)
-        throws InvalidProtocolBufferException;
+    }
   }
 
-  private TestMessagesProto3.TestAllTypes parseBinary(ByteString bytes)
+  private <MessageType extends AbstractMessage> MessageType parseBinary(
+      ByteString bytes, Parser <MessageType> parser, ExtensionRegistry extensions)
       throws InvalidProtocolBufferException {
-    TestMessagesProto3.TestAllTypes[] messages =
-        new TestMessagesProto3.TestAllTypes[BinaryDecoder.values().length];
-    InvalidProtocolBufferException[] exceptions =
-        new InvalidProtocolBufferException[BinaryDecoder.values().length];
+    ArrayList <MessageType> messages = new ArrayList <MessageType> ();
+    ArrayList <InvalidProtocolBufferException> exceptions =
+        new ArrayList <InvalidProtocolBufferException>();
+    
+    for (int i = 0; i < BinaryDecoderType.values().length; i++) {
+      messages.add(null);
+      exceptions.add(null);
+    }
+    BinaryDecoder <MessageType> decoder = new BinaryDecoder <MessageType> ();
 
     boolean hasMessage = false;
     boolean hasException = false;
-    for (int i = 0; i < BinaryDecoder.values().length; ++i) {
+    for (int i = 0; i < BinaryDecoderType.values().length; ++i) {
       try {
-        messages[i] = BinaryDecoder.values()[i].parse(bytes);
+        //= BinaryDecoderType.values()[i].parseProto3(bytes);
+        messages.set(i, decoder.decode(bytes, BinaryDecoderType.values()[i], parser, extensions));
         hasMessage = true;
       } catch (InvalidProtocolBufferException e) {
-        exceptions[i] = e;
+        exceptions.set(i, e);
         hasException = true;
       }
     }
@@ -174,9 +157,9 @@ class ConformanceJava {
     if (hasMessage && hasException) {
       StringBuilder sb =
           new StringBuilder("Binary decoders disagreed on whether the payload was valid.\n");
-      for (int i = 0; i < BinaryDecoder.values().length; ++i) {
-        sb.append(BinaryDecoder.values()[i].name());
-        if (messages[i] != null) {
+      for (int i = 0; i < BinaryDecoderType.values().length; ++i) {
+        sb.append(BinaryDecoderType.values()[i].name());
+        if (messages.get(i) != null) {
           sb.append(" accepted the payload.\n");
         } else {
           sb.append(" rejected the payload.\n");
@@ -188,14 +171,14 @@ class ConformanceJava {
     if (hasException) {
       // We do not check if exceptions are equal. Different implementations may return different
       // exception messages. Throw an arbitrary one out instead.
-      throw exceptions[0];
+      throw exceptions.get(0);
     }
 
     // Fast path comparing all the messages with the first message, assuming equality being
     // symmetric and transitive.
     boolean allEqual = true;
-    for (int i = 1; i < messages.length; ++i) {
-      if (!messages[0].equals(messages[i])) {
+    for (int i = 1; i < messages.size(); ++i) {
+      if (!messages.get(0).equals(messages.get(i))) {
         allEqual = false;
         break;
       }
@@ -204,12 +187,12 @@ class ConformanceJava {
     // Slow path: compare and find out all unequal pairs.
     if (!allEqual) {
       StringBuilder sb = new StringBuilder();
-      for (int i = 0; i < messages.length - 1; ++i) {
-        for (int j = i + 1; j < messages.length; ++j) {
-          if (!messages[i].equals(messages[j])) {
-            sb.append(BinaryDecoder.values()[i].name())
+      for (int i = 0; i < messages.size() - 1; ++i) {
+        for (int j = i + 1; j < messages.size(); ++j) {
+          if (!messages.get(i).equals(messages.get(j))) {
+            sb.append(BinaryDecoderType.values()[i].name())
                 .append(" and ")
-                .append(BinaryDecoder.values()[j].name())
+                .append(BinaryDecoderType.values()[j].name())
                 .append(" parsed the payload differently.\n");
           }
         }
@@ -217,24 +200,41 @@ class ConformanceJava {
       throw new RuntimeException(sb.toString());
     }
 
-    return messages[0];
+    return messages.get(0);
   }
 
   private Conformance.ConformanceResponse doTest(Conformance.ConformanceRequest request) {
-    TestMessagesProto3.TestAllTypes testMessage;
+    com.google.protobuf.AbstractMessage testMessage;
+    boolean isProto3 = request.getMessageType().equals("protobuf_test_messages.proto3.TestAllTypesProto3");
+    boolean isProto2 = request.getMessageType().equals("protobuf_test_messages.proto2.TestAllTypesProto2");
 
     switch (request.getPayloadCase()) {
       case PROTOBUF_PAYLOAD: {
-        try {
-          testMessage = parseBinary(request.getProtobufPayload());
-        } catch (InvalidProtocolBufferException e) {
-          return Conformance.ConformanceResponse.newBuilder().setParseError(e.getMessage()).build();
+        if (isProto3) {
+          try {
+            ExtensionRegistry extensions = ExtensionRegistry.newInstance();
+            TestMessagesProto3.registerAllExtensions(extensions);
+            testMessage = parseBinary(request.getProtobufPayload(), TestAllTypesProto3.parser(), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            return Conformance.ConformanceResponse.newBuilder().setParseError(e.getMessage()).build();
+          }
+        } else if (isProto2) {
+          try {
+            ExtensionRegistry extensions = ExtensionRegistry.newInstance();
+            TestMessagesProto2.registerAllExtensions(extensions);
+            testMessage = parseBinary(request.getProtobufPayload(), TestAllTypesProto2.parser(), extensions);
+          } catch (InvalidProtocolBufferException e) {
+            return Conformance.ConformanceResponse.newBuilder().setParseError(e.getMessage()).build();
+          }
+        } else {
+          throw new RuntimeException("Protobuf request doesn't have specific payload type.");
         }
         break;
       }
       case JSON_PAYLOAD: {
         try {
-          TestMessagesProto3.TestAllTypes.Builder builder = TestMessagesProto3.TestAllTypes.newBuilder();
+          TestMessagesProto3.TestAllTypesProto3.Builder builder = 
+              TestMessagesProto3.TestAllTypesProto3.newBuilder();
           JsonFormat.parser().usingTypeRegistry(typeRegistry)
               .merge(request.getJsonPayload(), builder);
           testMessage = builder.build();
@@ -256,8 +256,10 @@ class ConformanceJava {
       case UNSPECIFIED:
         throw new RuntimeException("Unspecified output format.");
 
-      case PROTOBUF:
-        return Conformance.ConformanceResponse.newBuilder().setProtobufPayload(testMessage.toByteString()).build();
+      case PROTOBUF: {
+        ByteString MessageString = testMessage.toByteString(); 
+        return Conformance.ConformanceResponse.newBuilder().setProtobufPayload(MessageString).build();
+      }
 
       case JSON:
         try {
@@ -300,7 +302,7 @@ class ConformanceJava {
 
   public void run() throws Exception {
     typeRegistry = TypeRegistry.newBuilder().add(
-        TestMessagesProto3.TestAllTypes.getDescriptor()).build();
+        TestMessagesProto3.TestAllTypesProto3.getDescriptor()).build();
     while (doTestIo()) {
       this.testCount++;
     }
diff --git a/conformance/Makefile.am b/conformance/Makefile.am
index cf7eee3a..765f3588 100644
--- a/conformance/Makefile.am
+++ b/conformance/Makefile.am
@@ -4,6 +4,11 @@ conformance_protoc_inputs =                                    \
   conformance.proto                                            \
   $(top_srcdir)/src/google/protobuf/test_messages_proto3.proto
 
+# proto2 input files, should be separated with proto3, as we
+# can't generate proto2 files for ruby, php and objc
+conformance_proto2_protoc_inputs =                             \
+  $(top_srcdir)/src/google/protobuf/test_messages_proto2.proto
+
 well_known_type_protoc_inputs =                                \
   $(top_srcdir)/src/google/protobuf/any.proto                  \
   $(top_srcdir)/src/google/protobuf/duration.proto             \
@@ -21,6 +26,7 @@ other_language_protoc_outputs =                                \
   conformance_pb2.py                                           \
   Conformance.pbobjc.h                                         \
   Conformance.pbobjc.m                                         \
+  conformance_pb.js                                            \
   conformance_pb.rb                                            \
   com/google/protobuf/Any.java                                 \
   com/google/protobuf/AnyOrBuilder.java                        \
@@ -63,6 +69,7 @@ other_language_protoc_outputs =                                \
   com/google/protobuf/ValueOrBuilder.java                      \
   com/google/protobuf/WrappersProto.java                       \
   com/google/protobuf_test_messages/proto3/TestMessagesProto3.java \
+  com/google/protobuf_test_messages/proto2/TestMessagesProto2.java \
   google/protobuf/any.pb.cc                                    \
   google/protobuf/any.pb.h                                     \
   google/protobuf/any.rb                                       \
@@ -79,12 +86,17 @@ other_language_protoc_outputs =                                \
   google/protobuf/struct.pb.h                                  \
   google/protobuf/struct.rb                                    \
   google/protobuf/struct_pb2.py                                \
+  google/protobuf/TestMessagesProto2.pbobjc.h                  \
+  google/protobuf/TestMessagesProto2.pbobjc.m                  \
   google/protobuf/TestMessagesProto3.pbobjc.h                  \
   google/protobuf/TestMessagesProto3.pbobjc.m                  \
   google/protobuf/test_messages_proto3.pb.cc                   \
   google/protobuf/test_messages_proto3.pb.h                    \
+  google/protobuf/test_messages_proto2.pb.cc                   \
+  google/protobuf/test_messages_proto2.pb.h                    \
   google/protobuf/test_messages_proto3_pb.rb                   \
   google/protobuf/test_messages_proto3_pb2.py                  \
+  google/protobuf/test_messages_proto2_pb2.py                  \
   google/protobuf/timestamp.pb.cc                              \
   google/protobuf/timestamp.pb.h                               \
   google/protobuf/timestamp.rb                                 \
@@ -183,6 +195,7 @@ EXTRA_DIST =                  \
   failure_list_cpp.txt        \
   failure_list_csharp.txt     \
   failure_list_java.txt       \
+  failure_list_js.txt         \
   failure_list_objc.txt       \
   failure_list_python.txt     \
   failure_list_python_cpp.txt \
@@ -196,7 +209,7 @@ conformance_test_runner_SOURCES = conformance_test.h conformance_test.cc \
                                   conformance_test_runner.cc             \
                                   third_party/jsoncpp/json.h             \
                                   third_party/jsoncpp/jsoncpp.cpp
-nodist_conformance_test_runner_SOURCES = conformance.pb.cc google/protobuf/test_messages_proto3.pb.cc
+nodist_conformance_test_runner_SOURCES = conformance.pb.cc google/protobuf/test_messages_proto3.pb.cc google/protobuf/test_messages_proto2.pb.cc
 conformance_test_runner_CPPFLAGS = -I$(top_srcdir)/src -I$(srcdir)
 conformance_test_runner_CXXFLAGS = -std=c++11
 # Explicit deps beacuse BUILT_SOURCES are only done before a "make all/check"
@@ -206,7 +219,7 @@ conformance_test_runner-conformance_test_runner.$(OBJEXT): conformance.pb.h
 
 conformance_cpp_LDADD = $(top_srcdir)/src/libprotobuf.la
 conformance_cpp_SOURCES = conformance_cpp.cc
-nodist_conformance_cpp_SOURCES = conformance.pb.cc google/protobuf/test_messages_proto3.pb.cc
+nodist_conformance_cpp_SOURCES = conformance.pb.cc google/protobuf/test_messages_proto3.pb.cc google/protobuf/test_messages_proto2.pb.cc
 conformance_cpp_CPPFLAGS = -I$(top_srcdir)/src
 # Explicit dep beacuse BUILT_SOURCES are only done before a "make all/check"
 # so a direct "make test_cpp" could fail if parallel enough.
@@ -217,7 +230,7 @@ if OBJC_CONFORMANCE_TEST
 bin_PROGRAMS += conformance-objc
 
 conformance_objc_SOURCES = conformance_objc.m ../objectivec/GPBProtocolBuffers.m
-nodist_conformance_objc_SOURCES = Conformance.pbobjc.m google/protobuf/TestMessagesProto3.pbobjc.m
+nodist_conformance_objc_SOURCES = Conformance.pbobjc.m google/protobuf/TestMessagesProto2.pbobjc.m google/protobuf/TestMessagesProto3.pbobjc.m
 # On travis, the build fails without the isysroot because whatever system
 # headers are being found don't include generics support for
 # NSArray/NSDictionary, the only guess is their image at one time had an odd
@@ -226,16 +239,24 @@ conformance_objc_CPPFLAGS = -I$(top_srcdir)/objectivec -isysroot `xcrun --sdk ma
 conformance_objc_LDFLAGS = -framework Foundation
 # Explicit dep beacuse BUILT_SOURCES are only done before a "make all/check"
 # so a direct "make test_objc" could fail if parallel enough.
-conformance_objc-conformance_objc.$(OBJEXT): Conformance.pbobjc.h google/protobuf/TestMessagesProto3.pbobjc.h
+conformance_objc-conformance_objc.$(OBJEXT): Conformance.pbobjc.h google/protobuf/TestMessagesProto2.pbobjc.h google/protobuf/TestMessagesProto3.pbobjc.h
 
 endif
 
+# JavaScript well-known types are expected to be in a directory called
+# google-protobuf, because they are usually in the google-protobuf npm
+# package.  But we want to use the sources from our tree, so we recreate
+# that directory structure here.
+google-protobuf:
+	mkdir google-protobuf
+
 if USE_EXTERNAL_PROTOC
 
 # Some implementations include pre-generated versions of well-known types.
-protoc_middleman: $(conformance_protoc_inputs) $(well_known_type_protoc_inputs)
-	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. --java_out=. --ruby_out=. --objc_out=. --python_out=. --php_out=. $(conformance_protoc_inputs)
-	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. --java_out=. --ruby_out=. --python_out=. --php_out=. $(well_known_type_protoc_inputs)
+protoc_middleman: $(conformance_protoc_inputs) $(conformance_proto2_protoc_inputs) $(well_known_type_protoc_inputs) google-protobuf
+	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. --java_out=. --ruby_out=. --objc_out=. --python_out=. --php_out=. --js_out=import_style=commonjs,binary:. $(conformance_protoc_inputs)
+	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. --java_out=. --objc_out=. --python_out=. --js_out=import_style=commonjs,binary:. $(conformance_proto2_protoc_inputs)
+	$(PROTOC) -I$(srcdir) -I$(top_srcdir) --cpp_out=. --java_out=. --ruby_out=. --python_out=. --js_out=import_style=commonjs,binary:google-protobuf $(well_known_type_protoc_inputs)
 	## $(PROTOC) -I$(srcdir) -I$(top_srcdir) --java_out=lite:lite $(conformance_protoc_inputs) $(well_known_type_protoc_inputs)
 	touch protoc_middleman
 
@@ -244,9 +265,10 @@ else
 # We have to cd to $(srcdir) before executing protoc because $(protoc_inputs) is
 # relative to srcdir, which may not be the same as the current directory when
 # building out-of-tree.
-protoc_middleman: $(top_srcdir)/src/protoc$(EXEEXT) $(conformance_protoc_inputs) $(well_known_type_protoc_inputs)
-	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd --java_out=$$oldpwd --ruby_out=$$oldpwd --objc_out=$$oldpwd --python_out=$$oldpwd --php_out=$$oldpwd $(conformance_protoc_inputs) )
-	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd --java_out=$$oldpwd --ruby_out=$$oldpwd --python_out=$$oldpwd --php_out=$$oldpwd $(well_known_type_protoc_inputs) )
+protoc_middleman: $(top_srcdir)/src/protoc$(EXEEXT) $(conformance_protoc_inputs) $(conformance_proto2_protoc_inputs) $(well_known_type_protoc_inputs) google-protobuf
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd --java_out=$$oldpwd --ruby_out=$$oldpwd --objc_out=$$oldpwd --python_out=$$oldpwd --php_out=$$oldpwd --js_out=import_style=commonjs,binary:$$oldpwd $(conformance_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd --java_out=$$oldpwd --objc_out=. --python_out=$$oldpwd --js_out=import_style=commonjs,binary:$$oldpwd $(conformance_proto2_protoc_inputs) )
+	oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --cpp_out=$$oldpwd --java_out=$$oldpwd --ruby_out=$$oldpwd --python_out=$$oldpwd --js_out=import_style=commonjs,binary:$$oldpwd/google-protobuf $(well_known_type_protoc_inputs) )
 	## @mkdir -p lite
 	## oldpwd=`pwd` && ( cd $(srcdir) && $$oldpwd/../src/protoc$(EXEEXT) -I. -I$(top_srcdir)/src --java_out=lite:$$oldpwd/lite $(conformance_protoc_inputs) $(well_known_type_protoc_inputs) )
 	touch protoc_middleman
@@ -265,7 +287,7 @@ MAINTAINERCLEANFILES =   \
   Makefile.in
 
 javac_middleman: ConformanceJava.java protoc_middleman $(other_language_protoc_outputs)
-	jar=`ls ../java/util/target/*jar-with-dependencies.jar` && javac -classpath ../java/target/classes:$$jar ConformanceJava.java com/google/protobuf/conformance/Conformance.java com/google/protobuf_test_messages/proto3/TestMessagesProto3.java
+	jar=`ls ../java/util/target/*jar-with-dependencies.jar` && javac -classpath ../java/target/classes:$$jar ConformanceJava.java com/google/protobuf/conformance/Conformance.java com/google/protobuf_test_messages/proto3/TestMessagesProto3.java com/google/protobuf_test_messages/proto2/TestMessagesProto2.java
 	@touch javac_middleman
 
 conformance-java: javac_middleman
@@ -296,7 +318,7 @@ conformance-csharp: $(other_language_protoc_outputs)
 conformance-php:
 	@echo "Writing shortcut script conformance-php..."
 	@echo '#! /bin/sh' > conformance-php
-	@echo 'php  ./conformance_php.php' >> conformance-php
+	@echo 'php -d auto_prepend_file=autoload.php ./conformance_php.php' >> conformance-php
 	@chmod +x conformance-php
 
 conformance-php-c:
@@ -327,6 +349,9 @@ test_php: protoc_middleman conformance-test-runner conformance-php $(other_langu
 test_php_c: protoc_middleman conformance-test-runner conformance-php-c $(other_language_protoc_outputs)
 	./conformance-test-runner --enforce_recommended --failure_list failure_list_php_c.txt ./conformance-php-c
 
+test_php_zts_c: protoc_middleman conformance-test-runner conformance-php-c $(other_language_protoc_outputs)
+	./conformance-test-runner --enforce_recommended --failure_list failure_list_php_zts_c.txt ./conformance-php-c
+
 # These depend on library paths being properly set up.  The easiest way to
 # run them is to just use "tox" from the python dir.
 test_python: protoc_middleman conformance-test-runner
@@ -335,6 +360,9 @@ test_python: protoc_middleman conformance-test-runner
 test_python_cpp: protoc_middleman conformance-test-runner
 	./conformance-test-runner --enforce_recommended --failure_list failure_list_python_cpp.txt ./conformance_python.py
 
+test_nodejs: protoc_middleman conformance-test-runner $(other_language_protoc_outputs)
+	NODE_PATH=../js:. ./conformance-test-runner --enforce_recommended --failure_list failure_list_js.txt ./conformance_nodejs.js
+
 if OBJC_CONFORMANCE_TEST
 
 test_objc: protoc_middleman conformance-test-runner conformance-objc
diff --git a/conformance/README.md b/conformance/README.md
index 9388055f..971fe8f6 100644
--- a/conformance/README.md
+++ b/conformance/README.md
@@ -19,11 +19,39 @@ directory to build `protoc`, since all the tests depend on it.
 
     $ make
 
-Then to run the tests against the C++ implementation, run:
+Running the tests for C++
+-------------------------
+
+To run the tests against the C++ implementation, run:
 
     $ cd conformance && make test_cpp
 
-More tests and languages will be added soon!
+Running the tests for JavaScript (Node.js)
+------------------------------------------
+
+To run the JavaScript tests against Node.js, make sure you have "node"
+on your path and then run:
+
+    $ cd conformance && make test_nodejs
+
+Running the tests for Ruby (MRI)
+--------------------------------
+
+To run the Ruby tests against MRI, first build the C extension:
+
+    $ cd ruby && rake
+
+Then run the tests like so:
+
+    $ cd conformance && make test_ruby
+
+Running the tests for other languages
+-------------------------------------
+
+Most of the languages in the Protobuf source tree are set up to run
+conformance tests.  However some of them are more tricky to set up
+properly.  See `tests.sh` in the base of the repository to see how
+Travis runs the tests.
 
 Testing other Protocol Buffer implementations
 ---------------------------------------------
diff --git a/conformance/autoload.php b/conformance/autoload.php
new file mode 100644
index 00000000..0f49aecb
--- /dev/null
+++ b/conformance/autoload.php
@@ -0,0 +1,21 @@
+<?php
+
+define("GOOGLE_INTERNAL_NAMESPACE", "Google\\Protobuf\\Internal\\");
+define("GOOGLE_NAMESPACE", "Google\\Protobuf\\");
+define("GOOGLE_GPBMETADATA_NAMESPACE", "GPBMetadata\\Google\\Protobuf\\");
+
+function protobuf_autoloader_impl($class, $prefix) {
+    $length = strlen($prefix);
+    if ((substr($class, 0, $length) === $prefix)) {
+        $path = '../php/src/' . implode('/', array_map('ucwords', explode('\\', $class))) . '.php';
+        include_once $path;
+    }
+}
+
+function protobuf_autoloader($class) {
+    protobuf_autoloader_impl($class, GOOGLE_INTERNAL_NAMESPACE);
+    protobuf_autoloader_impl($class, GOOGLE_NAMESPACE);
+    protobuf_autoloader_impl($class, GOOGLE_GPBMETADATA_NAMESPACE);
+}
+
+spl_autoload_register('protobuf_autoloader');
diff --git a/conformance/conformance.proto b/conformance/conformance.proto
index 18e4b7bc..525140e9 100644
--- a/conformance/conformance.proto
+++ b/conformance/conformance.proto
@@ -77,6 +77,11 @@ message ConformanceRequest {
 
   // Which format should the testee serialize its message to?
   WireFormat requested_output_format = 3;
+
+  // The full name for the test message to use; for the moment, either:
+  // protobuf_test_messages.proto3.TestAllTypesProto3 or
+  // protobuf_test_messages.proto2.TestAllTypesProto2.
+  string message_type = 4;
 }
 
 // Represents a single test case's output.
diff --git a/conformance/conformance_cpp.cc b/conformance/conformance_cpp.cc
index b865cd93..97ae1a7a 100644
--- a/conformance/conformance_cpp.cc
+++ b/conformance/conformance_cpp.cc
@@ -34,6 +34,8 @@
 
 #include "conformance.pb.h"
 #include <google/protobuf/test_messages_proto3.pb.h>
+#include <google/protobuf/test_messages_proto2.pb.h>
+#include <google/protobuf/message.h>
 #include <google/protobuf/util/json_util.h>
 #include <google/protobuf/util/type_resolver_util.h>
 
@@ -41,13 +43,15 @@ using conformance::ConformanceRequest;
 using conformance::ConformanceResponse;
 using google::protobuf::Descriptor;
 using google::protobuf::DescriptorPool;
-using google::protobuf::internal::scoped_ptr;
+using google::protobuf::Message;
+using google::protobuf::MessageFactory;
 using google::protobuf::util::BinaryToJsonString;
 using google::protobuf::util::JsonToBinaryString;
 using google::protobuf::util::NewTypeResolverForDescriptorPool;
 using google::protobuf::util::Status;
 using google::protobuf::util::TypeResolver;
-using protobuf_test_messages::proto3::TestAllTypes;
+using protobuf_test_messages::proto3::TestAllTypesProto3;
+using protobuf_test_messages::proto2::TestAllTypesProto2;
 using std::string;
 
 static const char kTypeUrlPrefix[] = "type.googleapis.com";
@@ -87,17 +91,24 @@ void CheckedWrite(int fd, const void *buf, size_t len) {
 }
 
 void DoTest(const ConformanceRequest& request, ConformanceResponse* response) {
-  TestAllTypes test_message;
+  Message *test_message;
+  const Descriptor *descriptor = DescriptorPool::generated_pool()->FindMessageTypeByName(
+      request.message_type());
+  if (!descriptor) {
+    GOOGLE_LOG(FATAL) << "No such message type: " << request.message_type();
+  }
+  test_message = MessageFactory::generated_factory()->GetPrototype(descriptor)->New();
 
   switch (request.payload_case()) {
-    case ConformanceRequest::kProtobufPayload:
-      if (!test_message.ParseFromString(request.protobuf_payload())) {
+    case ConformanceRequest::kProtobufPayload: {
+      if (!test_message->ParseFromString(request.protobuf_payload())) {
         // Getting parse details would involve something like:
         //   http://stackoverflow.com/questions/22121922/how-can-i-get-more-details-about-errors-generated-during-protobuf-parsing-c
         response->set_parse_error("Parse error (no more details available).");
         return;
       }
       break;
+    }
 
     case ConformanceRequest::kJsonPayload: {
       string proto_binary;
@@ -109,7 +120,7 @@ void DoTest(const ConformanceRequest& request, ConformanceResponse* response) {
         return;
       }
 
-      if (!test_message.ParseFromString(proto_binary)) {
+      if (!test_message->ParseFromString(proto_binary)) {
         response->set_runtime_error(
             "Parsing JSON generates invalid proto output.");
         return;
@@ -127,14 +138,14 @@ void DoTest(const ConformanceRequest& request, ConformanceResponse* response) {
       GOOGLE_LOG(FATAL) << "Unspecified output format";
       break;
 
-    case conformance::PROTOBUF:
-      GOOGLE_CHECK(
-          test_message.SerializeToString(response->mutable_protobuf_payload()));
+    case conformance::PROTOBUF: {
+      GOOGLE_CHECK(test_message->SerializeToString(response->mutable_protobuf_payload()));
       break;
+    }
 
     case conformance::JSON: {
       string proto_binary;
-      GOOGLE_CHECK(test_message.SerializeToString(&proto_binary));
+      GOOGLE_CHECK(test_message->SerializeToString(&proto_binary));
       Status status = BinaryToJsonString(type_resolver, *type_url, proto_binary,
                                          response->mutable_json_payload());
       if (!status.ok()) {
@@ -197,7 +208,7 @@ bool DoTestIo() {
 int main() {
   type_resolver = NewTypeResolverForDescriptorPool(
       kTypeUrlPrefix, DescriptorPool::generated_pool());
-  type_url = new string(GetTypeUrl(TestAllTypes::descriptor()));
+  type_url = new string(GetTypeUrl(TestAllTypesProto3::descriptor()));
   while (1) {
     if (!DoTestIo()) {
       fprintf(stderr, "conformance-cpp: received EOF from test runner "
diff --git a/conformance/conformance_nodejs.js b/conformance/conformance_nodejs.js
new file mode 100755
index 00000000..5d3955f7
--- /dev/null
+++ b/conformance/conformance_nodejs.js
@@ -0,0 +1,182 @@
+#!/usr/bin/env node
+
+/*
+ * Protocol Buffers - Google's data interchange format
+ * Copyright 2008 Google Inc.  All rights reserved.
+ * https://developers.google.com/protocol-buffers/
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+var conformance = require('conformance_pb');
+var test_messages_proto3 = require('google/protobuf/test_messages_proto3_pb');
+var test_messages_proto2 = require('google/protobuf/test_messages_proto2_pb');
+var fs = require('fs');
+
+var testCount = 0;
+
+function doTest(request) {
+  var testMessage;
+  var response = new conformance.ConformanceResponse();
+
+  try {
+    if (request.getRequestedOutputFormat() === conformance.WireFormat.JSON) {
+      response.setSkipped("JSON not supported.");
+      return response;
+    }
+
+    switch (request.getPayloadCase()) {
+      case conformance.ConformanceRequest.PayloadCase.PROTOBUF_PAYLOAD: {
+        if (request.getMessageType() == "protobuf_test_messages.proto3.TestAllTypesProto3") {
+          try {
+            testMessage = test_messages_proto3.TestAllTypesProto3.deserializeBinary(
+                request.getProtobufPayload());
+          } catch (err) {
+            response.setParseError(err.toString());
+            return response;
+          }
+        } else if (request.getMessageType() == "protobuf_test_messages.proto2.TestAllTypesProto2"){
+          try {
+            testMessage = test_messages_proto2.TestAllTypesProto2.deserializeBinary(
+                request.getProtobufPayload());
+          } catch (err) {
+            response.setParseError(err.toString());
+            return response;
+          }
+        } else {
+          throw "Protobuf request doesn\'t have specific payload type";
+        }
+      }
+
+      case conformance.ConformanceRequest.PayloadCase.JSON_PAYLOAD:
+        response.setSkipped("JSON not supported.");
+        return response;
+
+      case conformance.ConformanceRequest.PayloadCase.PAYLOAD_NOT_SET:
+        response.setRuntimeError("Request didn't have payload");
+        return response;
+    }
+
+    switch (request.getRequestedOutputFormat()) {
+      case conformance.WireFormat.UNSPECIFIED:
+        response.setRuntimeError("Unspecified output format");
+        return response;
+
+      case conformance.WireFormat.PROTOBUF:
+        response.setProtobufPayload(testMessage.serializeBinary());
+
+      case conformance.WireFormat.JSON:
+        response.setSkipped("JSON not supported.");
+        return response;
+
+      default:
+        throw "Request didn't have requested output format";
+    }
+  } catch (err) {
+    response.setRuntimeError(err.toString());
+  }
+
+  return response;
+}
+
+function onEof(totalRead) {
+  if (totalRead == 0) {
+    return undefined;
+  } else {
+    throw "conformance_nodejs: premature EOF on stdin.";
+  }
+}
+
+// Utility function to read a buffer of N bytes.
+function readBuffer(bytes) {
+  var buf = new Buffer(bytes);
+  var totalRead = 0;
+  while (totalRead < bytes) {
+    var read = 0;
+    try {
+      read = fs.readSync(process.stdin.fd, buf, totalRead, bytes - totalRead);
+    } catch (e) {
+      if (e.code == 'EOF') {
+        return onEof(totalRead)
+      } else if (e.code == 'EAGAIN') {
+      } else {
+        throw "conformance_nodejs: Error reading from stdin." + e;
+      }
+    }
+
+    totalRead += read;
+  }
+
+  return buf;
+}
+
+function writeBuffer(buffer) {
+  var totalWritten = 0;
+  while (totalWritten < buffer.length) {
+    totalWritten += fs.writeSync(
+        process.stdout.fd, buffer, totalWritten, buffer.length - totalWritten);
+  }
+}
+
+// Returns true if the test ran successfully, false on legitimate EOF.
+// If EOF is encountered in an unexpected place, raises IOError.
+function doTestIo() {
+  var lengthBuf = readBuffer(4);
+  if (!lengthBuf) {
+    return false;
+  }
+
+  var length = lengthBuf.readInt32LE(0);
+  var serializedRequest = readBuffer(length);
+  if (!serializedRequest) {
+    throw "conformance_nodejs: Failed to read request.";
+  }
+
+  serializedRequest = new Uint8Array(serializedRequest);
+  var request =
+      conformance.ConformanceRequest.deserializeBinary(serializedRequest);
+  var response = doTest(request);
+
+  var serializedResponse = response.serializeBinary();
+
+  lengthBuf = new Buffer(4);
+  lengthBuf.writeInt32LE(serializedResponse.length, 0);
+  writeBuffer(lengthBuf);
+  writeBuffer(new Buffer(serializedResponse));
+
+  testCount += 1
+
+  return true;
+}
+
+while (true) {
+  if (!doTestIo()) {
+    console.error('conformance_nodejs: received EOF from test runner ' +
+                  "after " + testCount + " tests, exiting")
+    break;
+  }
+}
diff --git a/conformance/conformance_objc.m b/conformance/conformance_objc.m
index ef037f84..84a43811 100644
--- a/conformance/conformance_objc.m
+++ b/conformance/conformance_objc.m
@@ -31,6 +31,7 @@
 #import <Foundation/Foundation.h>
 
 #import "Conformance.pbobjc.h"
+#import "google/protobuf/TestMessagesProto2.pbobjc.h"
 #import "google/protobuf/TestMessagesProto3.pbobjc.h"
 
 static void Die(NSString *format, ...) __dead2;
@@ -63,7 +64,7 @@ static NSData *CheckedReadDataOfLength(NSFileHandle *handle, NSUInteger numBytes
 
 static ConformanceResponse *DoTest(ConformanceRequest *request) {
   ConformanceResponse *response = [ConformanceResponse message];
-  TestAllTypes *testMessage = nil;
+  GPBMessage *testMessage = nil;
 
   switch (request.payloadOneOfCase) {
     case ConformanceRequest_Payload_OneOfCase_GPBUnsetOneOfCase:
@@ -71,9 +72,16 @@ static ConformanceResponse *DoTest(ConformanceRequest *request) {
       break;
 
     case ConformanceRequest_Payload_OneOfCase_ProtobufPayload: {
+      Class msgClass = nil;
+      if ([request.messageType isEqual:@"protobuf_test_messages.proto3.TestAllTypesProto3"]) {
+        msgClass = [Proto3TestAllTypesProto3 class];
+      } else if ([request.messageType isEqual:@"protobuf_test_messages.proto2.TestAllTypesProto2"]) {
+        msgClass = [TestAllTypesProto2 class];
+      } else {
+        Die(@"Protobuf request had an unknown message_type: %@", request.messageType);
+      }
       NSError *error = nil;
-      testMessage = [TestAllTypes parseFromData:request.protobufPayload
-                                          error:&error];
+      testMessage = [msgClass parseFromData:request.protobufPayload error:&error];
       if (!testMessage) {
         response.parseError =
             [NSString stringWithFormat:@"Parse error: %@", error];
diff --git a/conformance/conformance_php.php b/conformance/conformance_php.php
index 20fb5082..19f9a092 100755
--- a/conformance/conformance_php.php
+++ b/conformance/conformance_php.php
@@ -3,57 +3,44 @@
 require_once("Conformance/WireFormat.php");
 require_once("Conformance/ConformanceResponse.php");
 require_once("Conformance/ConformanceRequest.php");
-require_once("Google/Protobuf/Any.php");
-require_once("Google/Protobuf/Duration.php");
-require_once("Google/Protobuf/FieldMask.php");
-require_once("Google/Protobuf/Struct.php");
-require_once("Google/Protobuf/Value.php");
-require_once("Google/Protobuf/ListValue.php");
-require_once("Google/Protobuf/NullValue.php");
-require_once("Google/Protobuf/Timestamp.php");
-require_once("Google/Protobuf/DoubleValue.php");
-require_once("Google/Protobuf/BytesValue.php");
-require_once("Google/Protobuf/FloatValue.php");
-require_once("Google/Protobuf/Int64Value.php");
-require_once("Google/Protobuf/UInt32Value.php");
-require_once("Google/Protobuf/BoolValue.php");
-require_once("Google/Protobuf/DoubleValue.php");
-require_once("Google/Protobuf/Int32Value.php");
-require_once("Google/Protobuf/StringValue.php");
-require_once("Google/Protobuf/UInt64Value.php");
 require_once("Protobuf_test_messages/Proto3/ForeignMessage.php");
 require_once("Protobuf_test_messages/Proto3/ForeignEnum.php");
-require_once("Protobuf_test_messages/Proto3/TestAllTypes.php");
-require_once("Protobuf_test_messages/Proto3/TestAllTypes_NestedMessage.php");
-require_once("Protobuf_test_messages/Proto3/TestAllTypes_NestedEnum.php");
+require_once("Protobuf_test_messages/Proto3/TestAllTypesProto3.php");
+require_once("Protobuf_test_messages/Proto3/TestAllTypesProto3_NestedMessage.php");
+require_once("Protobuf_test_messages/Proto3/TestAllTypesProto3_NestedEnum.php");
 
 require_once("GPBMetadata/Conformance.php");
-require_once("GPBMetadata/Google/Protobuf/Any.php");
-require_once("GPBMetadata/Google/Protobuf/Duration.php");
-require_once("GPBMetadata/Google/Protobuf/FieldMask.php");
-require_once("GPBMetadata/Google/Protobuf/Struct.php");
-require_once("GPBMetadata/Google/Protobuf/Timestamp.php");
-require_once("GPBMetadata/Google/Protobuf/Wrappers.php");
 require_once("GPBMetadata/Google/Protobuf/TestMessagesProto3.php");
 
 use  \Conformance\WireFormat;
 
+if (!ini_get("date.timezone")) {
+  ini_set("date.timezone", "UTC");
+}
+
 $test_count = 0;
 
 function doTest($request)
 {
-    $test_message = new \Protobuf_test_messages\Proto3\TestAllTypes();
+    $test_message = new \Protobuf_test_messages\Proto3\TestAllTypesProto3();
     $response = new \Conformance\ConformanceResponse();
     if ($request->getPayload() == "protobuf_payload") {
-      try {
+      if ($request->getMessageType() == "protobuf_test_messages.proto3.TestAllTypesProto3") {
+        try {
           $test_message->mergeFromString($request->getProtobufPayload());
-      } catch (Exception $e) {
+        } catch (Exception $e) {
           $response->setParseError($e->getMessage());
           return $response;
+        }
+      } elseif ($request->getMessageType() == "protobuf_test_messages.proto2.TestAllTypesProto2") {
+        $response->setSkipped("PHP doesn't support proto2");
+        return $response;
+      } else {
+        trigger_error("Protobuf request doesn't have specific payload type", E_USER_ERROR);
       }
     } elseif ($request->getPayload() == "json_payload") {
       try {
-          $test_message->jsonDecode($request->getJsonPayload());
+          $test_message->mergeFromJsonString($request->getJsonPayload());
       } catch (Exception $e) {
           $response->setParseError($e->getMessage());
           return $response;
@@ -67,7 +54,12 @@ function doTest($request)
     } elseif ($request->getRequestedOutputFormat() == WireFormat::PROTOBUF) {
       $response->setProtobufPayload($test_message->serializeToString());
     } elseif ($request->getRequestedOutputFormat() == WireFormat::JSON) {
-      $response->setJsonPayload($test_message->jsonEncode());
+      try {
+          $response->setJsonPayload($test_message->serializeToJsonString());
+      } catch (Exception $e) {
+          $response->setSerializeError($e->getMessage());
+          return $response;
+      }
     }
 
     return $response;
@@ -79,7 +71,8 @@ function doTestIO()
     if (strlen($length_bytes) == 0) {
       return false;   # EOF
     } elseif (strlen($length_bytes) != 4) {
-      trigger_error("I/O error", E_USER_ERROR);
+      fwrite(STDERR, "I/O error\n");
+      return false;
     }
 
     $length = unpack("V", $length_bytes)[1];
diff --git a/conformance/conformance_python.py b/conformance/conformance_python.py
index 7ace9b16..c5ba2467 100755
--- a/conformance/conformance_python.py
+++ b/conformance/conformance_python.py
@@ -38,9 +38,12 @@ See conformance.proto for more information.
 import struct
 import sys
 import os
+from google.protobuf import descriptor
+from google.protobuf import descriptor_pool
 from google.protobuf import json_format
 from google.protobuf import message
 from google.protobuf import test_messages_proto3_pb2
+from google.protobuf import test_messages_proto2_pb2
 import conformance_pb2
 
 sys.stdout = os.fdopen(sys.stdout.fileno(), 'wb', 0)
@@ -53,9 +56,17 @@ class ProtocolError(Exception):
   pass
 
 def do_test(request):
-  test_message = test_messages_proto3_pb2.TestAllTypes()
+  isProto3 = (request.message_type == "protobuf_test_messages.proto3.TestAllTypesProto3")
+  isJson = (request.WhichOneof('payload') == 'json_payload')
+  isProto2 = (request.message_type == "protobuf_test_messages.proto2.TestAllTypesProto2")
+  
+  if (not isProto3) and (not isJson) and (not isProto2):
+    raise ProtocolError("Protobuf request doesn't have specific payload type")
+      
+  test_message = test_messages_proto2_pb2.TestAllTypesProto2() if isProto2 else \
+    test_messages_proto3_pb2.TestAllTypesProto3()
+
   response = conformance_pb2.ConformanceResponse()
-  test_message = test_messages_proto3_pb2.TestAllTypes()
 
   try:
     if request.WhichOneof('payload') == 'protobuf_payload':
@@ -63,8 +74,8 @@ def do_test(request):
         test_message.ParseFromString(request.protobuf_payload)
       except message.DecodeError as e:
         response.parse_error = str(e)
-        return response
-
+        return response  
+      
     elif request.WhichOneof('payload') == 'json_payload':
       try:
         json_format.Parse(request.json_payload, test_message)
@@ -82,7 +93,7 @@ def do_test(request):
       response.protobuf_payload = test_message.SerializeToString()
 
     elif request.requested_output_format == conformance_pb2.JSON:
-      try:
+      try: 
         response.json_payload = json_format.MessageToJson(test_message)
       except Exception as e:
         response.serialize_error = str(e)
diff --git a/conformance/conformance_ruby.rb b/conformance/conformance_ruby.rb
index b7b7cf1c..df63bf7c 100755
--- a/conformance/conformance_ruby.rb
+++ b/conformance/conformance_ruby.rb
@@ -37,23 +37,30 @@ $test_count = 0
 $verbose = false
 
 def do_test(request)
-  test_message = ProtobufTestMessages::Proto3::TestAllTypes.new
+  test_message = ProtobufTestMessages::Proto3::TestAllTypesProto3.new
   response = Conformance::ConformanceResponse.new
 
   begin
     case request.payload
     when :protobuf_payload
-      begin
-        test_message = ProtobufTestMessages::Proto3::TestAllTypes.decode(
-            request.protobuf_payload)
-      rescue Google::Protobuf::ParseError => err
-        response.parse_error = err.message.encode('utf-8')
+      if request.message_type.eql?('protobuf_test_messages.proto3.TestAllTypesProto3')
+        begin
+          test_message = ProtobufTestMessages::Proto3::TestAllTypesProto3.decode(
+              request.protobuf_payload)
+        rescue Google::Protobuf::ParseError => err
+          response.parse_error = err.message.encode('utf-8')
+          return response
+        end
+      elsif request.message_type.eql?('protobuf_test_messages.proto2.TestAllTypesProto2')
+        response.skipped = "Ruby doesn't support proto2"
         return response
+      else 
+        fail "Protobuf request doesn't have specific payload type"
       end
 
     when :json_payload
       begin
-        test_message = ProtobufTestMessages::Proto3::TestAllTypes.decode_json(
+        test_message = ProtobufTestMessages::Proto3::TestAllTypesProto3.decode_json(
             request.json_payload)
       rescue Google::Protobuf::ParseError => err
         response.parse_error = err.message.encode('utf-8')
diff --git a/conformance/conformance_test.cc b/conformance/conformance_test.cc
index 1e5387a5..22bbbfb3 100644
--- a/conformance/conformance_test.cc
+++ b/conformance/conformance_test.cc
@@ -35,6 +35,7 @@
 #include "conformance.pb.h"
 #include "conformance_test.h"
 #include <google/protobuf/test_messages_proto3.pb.h>
+#include <google/protobuf/test_messages_proto2.pb.h>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/stringprintf.h>
@@ -59,7 +60,8 @@ using google::protobuf::util::JsonToBinaryString;
 using google::protobuf::util::MessageDifferencer;
 using google::protobuf::util::NewTypeResolverForDescriptorPool;
 using google::protobuf::util::Status;
-using protobuf_test_messages::proto3::TestAllTypes;
+using protobuf_test_messages::proto3::TestAllTypesProto3;
+using protobuf_test_messages::proto2::TestAllTypesProto2;
 using std::string;
 
 namespace {
@@ -163,8 +165,10 @@ string submsg(uint32_t fn, const string& buf) {
 #define UNKNOWN_FIELD 666
 
 const FieldDescriptor* GetFieldForType(FieldDescriptor::Type type,
-                                       bool repeated) {
-  const Descriptor* d = TestAllTypes().GetDescriptor();
+                                       bool repeated, bool isProto3) {
+
+  const Descriptor* d = isProto3 ?
+      TestAllTypesProto3().GetDescriptor() : TestAllTypesProto2().GetDescriptor();
   for (int i = 0; i < d->field_count(); i++) {
     const FieldDescriptor* f = d->field(i);
     if (f->type() == type && f->is_repeated() == repeated) {
@@ -271,24 +275,63 @@ void ConformanceTestSuite::RunTest(const string& test_name,
 void ConformanceTestSuite::RunValidInputTest(
     const string& test_name, ConformanceLevel level, const string& input,
     WireFormat input_format, const string& equivalent_text_format,
-    WireFormat requested_output) {
-  TestAllTypes reference_message;
+    WireFormat requested_output, bool isProto3) {
+  auto newTestMessage = [&isProto3]() {
+    Message* newMessage;
+    if (isProto3) {
+      newMessage = new TestAllTypesProto3;
+    } else {
+      newMessage = new TestAllTypesProto2;
+    }
+    return newMessage;
+  };
+  Message* reference_message = newTestMessage();
   GOOGLE_CHECK(
-      TextFormat::ParseFromString(equivalent_text_format, &reference_message))
+      TextFormat::ParseFromString(equivalent_text_format, reference_message))
           << "Failed to parse data for test case: " << test_name
           << ", data: " << equivalent_text_format;
+  const string equivalent_wire_format = reference_message->SerializeAsString();
+  RunValidBinaryInputTest(test_name, level, input, input_format,
+                          equivalent_wire_format, requested_output, isProto3);
+}
+
+void ConformanceTestSuite::RunValidBinaryInputTest(
+    const string& test_name, ConformanceLevel level, const string& input,
+    WireFormat input_format, const string& equivalent_wire_format,
+    WireFormat requested_output, bool isProto3) {
+  auto newTestMessage = [&isProto3]() {
+    Message* newMessage;
+    if (isProto3) {
+      newMessage = new TestAllTypesProto3;
+    } else {
+      newMessage = new TestAllTypesProto2;
+    }
+    return newMessage;
+  };
+  Message* reference_message = newTestMessage();
+  GOOGLE_CHECK(
+      reference_message->ParseFromString(equivalent_wire_format))
+          << "Failed to parse wire data for test case: " << test_name;
 
   ConformanceRequest request;
   ConformanceResponse response;
 
   switch (input_format) {
-    case conformance::PROTOBUF:
+    case conformance::PROTOBUF: {
       request.set_protobuf_payload(input);
+      if (isProto3) {
+        request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
+      } else {
+        request.set_message_type("protobuf_test_messages.proto2.TestAllTypesProto2");
+      }
       break;
+    }
 
-    case conformance::JSON:
+    case conformance::JSON: {
+      request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
       request.set_json_payload(input);
       break;
+    }
 
     default:
       GOOGLE_LOG(FATAL) << "Unspecified input format";
@@ -298,7 +341,7 @@ void ConformanceTestSuite::RunValidInputTest(
 
   RunTest(test_name, request, &response);
 
-  TestAllTypes test_message;
+  Message *test_message = newTestMessage();
 
   switch (response.result_case()) {
     case ConformanceResponse::RESULT_NOT_SET:
@@ -334,10 +377,10 @@ void ConformanceTestSuite::RunValidInputTest(
         return;
       }
 
-      if (!test_message.ParseFromString(binary_protobuf)) {
+      if (!test_message->ParseFromString(binary_protobuf)) {
         ReportFailure(test_name, level, request, response,
-                      "INTERNAL ERROR: internal JSON->protobuf transcode "
-                      "yielded unparseable proto.");
+                    "INTERNAL ERROR: internal JSON->protobuf transcode "
+                    "yielded unparseable proto.");
         return;
       }
 
@@ -352,9 +395,9 @@ void ConformanceTestSuite::RunValidInputTest(
         return;
       }
 
-      if (!test_message.ParseFromString(response.protobuf_payload())) {
+      if (!test_message->ParseFromString(response.protobuf_payload())) {
         ReportFailure(test_name, level, request, response,
-                      "Protobuf output we received from test was unparseable.");
+                   "Protobuf output we received from test was unparseable.");
         return;
       }
 
@@ -373,7 +416,9 @@ void ConformanceTestSuite::RunValidInputTest(
   string differences;
   differencer.ReportDifferencesToString(&differences);
 
-  if (differencer.Compare(reference_message, test_message)) {
+  bool check;
+  check = differencer.Compare(*reference_message, *test_message);
+  if (check) {
     ReportSuccess(test_name);
   } else {
     ReportFailure(test_name, level, request, response,
@@ -381,14 +426,19 @@ void ConformanceTestSuite::RunValidInputTest(
                   differences.c_str());
   }
 }
-
-// Expect that this precise protobuf will cause a parse error.
-void ConformanceTestSuite::ExpectParseFailureForProto(
-    const string& proto, const string& test_name, ConformanceLevel level) {
+void ConformanceTestSuite::ExpectParseFailureForProtoWithProtoVersion (
+    const string& proto, const string& test_name, ConformanceLevel level,
+    bool isProto3) {
   ConformanceRequest request;
   ConformanceResponse response;
   request.set_protobuf_payload(proto);
+  if (isProto3) {
+    request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
+  } else {
+    request.set_message_type("protobuf_test_messages.proto2.TestAllTypesProto2");
+  }
   string effective_test_name = ConformanceLevelToString(level) +
+      (isProto3 ? ".Proto3" : ".Proto2") +
       ".ProtobufInput." + test_name;
 
   // We don't expect output, but if the program erroneously accepts the protobuf
@@ -406,6 +456,13 @@ void ConformanceTestSuite::ExpectParseFailureForProto(
   }
 }
 
+// Expect that this precise protobuf will cause a parse error.
+void ConformanceTestSuite::ExpectParseFailureForProto(
+    const string& proto, const string& test_name, ConformanceLevel level) {
+  ExpectParseFailureForProtoWithProtoVersion(proto, test_name, level, true);
+  ExpectParseFailureForProtoWithProtoVersion(proto, test_name, level, false);
+}
+
 // Expect that this protobuf will cause a parse error, even if it is followed
 // by valid protobuf data.  We can try running this twice: once with this
 // data verbatim and once with this data followed by some valid data.
@@ -420,41 +477,61 @@ void ConformanceTestSuite::RunValidJsonTest(
     const string& test_name, ConformanceLevel level, const string& input_json,
     const string& equivalent_text_format) {
   RunValidInputTest(
-      ConformanceLevelToString(level) + ".JsonInput." + test_name +
+      ConformanceLevelToString(level) + ".Proto3.JsonInput." + test_name +
       ".ProtobufOutput", level, input_json, conformance::JSON,
-      equivalent_text_format, conformance::PROTOBUF);
+      equivalent_text_format, conformance::PROTOBUF, true);
   RunValidInputTest(
-      ConformanceLevelToString(level) + ".JsonInput." + test_name +
+      ConformanceLevelToString(level) + ".Proto3.JsonInput." + test_name +
       ".JsonOutput", level, input_json, conformance::JSON,
-      equivalent_text_format, conformance::JSON);
+      equivalent_text_format, conformance::JSON, true);
 }
 
 void ConformanceTestSuite::RunValidJsonTestWithProtobufInput(
-    const string& test_name, ConformanceLevel level, const TestAllTypes& input,
+    const string& test_name, ConformanceLevel level, const TestAllTypesProto3& input,
     const string& equivalent_text_format) {
   RunValidInputTest(
-      ConformanceLevelToString(level) + ".ProtobufInput." + test_name +
+      ConformanceLevelToString(level) + ".Proto3" + ".ProtobufInput." + test_name +
       ".JsonOutput", level, input.SerializeAsString(), conformance::PROTOBUF,
-      equivalent_text_format, conformance::JSON);
+      equivalent_text_format, conformance::JSON, true);
 }
 
 void ConformanceTestSuite::RunValidProtobufTest(
     const string& test_name, ConformanceLevel level,
-    const string& input_protobuf, const string& equivalent_text_format) {
+    const string& input_protobuf, const string& equivalent_text_format,
+    bool isProto3) {
+  string rname = ".Proto3";
+  if (!isProto3) {
+    rname = ".Proto2";
+  }
   RunValidInputTest(
-      ConformanceLevelToString(level) + ".ProtobufInput." + test_name +
+      ConformanceLevelToString(level) + rname + ".ProtobufInput." + test_name +
       ".ProtobufOutput", level, input_protobuf, conformance::PROTOBUF,
-      equivalent_text_format, conformance::PROTOBUF);
-  RunValidInputTest(
-      ConformanceLevelToString(level) + ".ProtobufInput." + test_name +
-      ".JsonOutput", level, input_protobuf, conformance::PROTOBUF,
-      equivalent_text_format, conformance::JSON);
+      equivalent_text_format, conformance::PROTOBUF, isProto3);
+  if (isProto3) {
+    RunValidInputTest(
+        ConformanceLevelToString(level) + rname + ".ProtobufInput." +  test_name +
+        ".JsonOutput", level, input_protobuf, conformance::PROTOBUF,
+        equivalent_text_format, conformance::JSON, isProto3);
+  }
+}
+
+void ConformanceTestSuite::RunValidBinaryProtobufTest(
+    const string& test_name, ConformanceLevel level,
+    const string& input_protobuf, bool isProto3) {
+  string rname = ".Proto3";
+  if (!isProto3) {
+    rname = ".Proto2";
+  }
+  RunValidBinaryInputTest(
+      ConformanceLevelToString(level) + rname + ".ProtobufInput." + test_name +
+      ".ProtobufOutput", level, input_protobuf, conformance::PROTOBUF,
+      input_protobuf, conformance::PROTOBUF, isProto3);
 }
 
 void ConformanceTestSuite::RunValidProtobufTestWithMessage(
-    const string& test_name, ConformanceLevel level, const TestAllTypes& input,
-    const string& equivalent_text_format) {
-  RunValidProtobufTest(test_name, level, input.SerializeAsString(), equivalent_text_format);
+    const string& test_name, ConformanceLevel level, const Message *input,
+    const string& equivalent_text_format, bool isProto3) {
+  RunValidProtobufTest(test_name, level, input->SerializeAsString(), equivalent_text_format, isProto3);
 }
 
 // According to proto3 JSON specification, JSON serializers follow more strict
@@ -469,9 +546,10 @@ void ConformanceTestSuite::RunValidJsonTestWithValidator(
   ConformanceResponse response;
   request.set_json_payload(input_json);
   request.set_requested_output_format(conformance::JSON);
+  request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
 
   string effective_test_name = ConformanceLevelToString(level) +
-      ".JsonInput." + test_name + ".Validator";
+      ".Proto3.JsonInput." + test_name + ".Validator";
 
   RunTest(effective_test_name, request, &response);
 
@@ -507,8 +585,9 @@ void ConformanceTestSuite::ExpectParseFailureForJson(
   ConformanceRequest request;
   ConformanceResponse response;
   request.set_json_payload(input_json);
+  request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
   string effective_test_name =
-      ConformanceLevelToString(level) + ".JsonInput." + test_name;
+      ConformanceLevelToString(level) + ".Proto3.JsonInput." + test_name;
 
   // We don't expect output, but if the program erroneously accepts the protobuf
   // we let it send its response as this.  We must not leave it unspecified.
@@ -527,7 +606,7 @@ void ConformanceTestSuite::ExpectParseFailureForJson(
 
 void ConformanceTestSuite::ExpectSerializeFailureForJson(
     const string& test_name, ConformanceLevel level, const string& text_format) {
-  TestAllTypes payload_message;
+  TestAllTypesProto3 payload_message;
   GOOGLE_CHECK(
       TextFormat::ParseFromString(text_format, &payload_message))
           << "Failed to parse: " << text_format;
@@ -535,6 +614,7 @@ void ConformanceTestSuite::ExpectSerializeFailureForJson(
   ConformanceRequest request;
   ConformanceResponse response;
   request.set_protobuf_payload(payload_message.SerializeAsString());
+  request.set_message_type("protobuf_test_messages.proto3.TestAllTypesProto3");
   string effective_test_name =
       ConformanceLevelToString(level) + "." + test_name + ".JsonOutput";
   request.set_requested_output_format(conformance::JSON);
@@ -550,6 +630,7 @@ void ConformanceTestSuite::ExpectSerializeFailureForJson(
   }
 }
 
+//TODO: proto2?
 void ConformanceTestSuite::TestPrematureEOFForType(FieldDescriptor::Type type) {
   // Incomplete values for each wire type.
   static const string incompletes[6] = {
@@ -561,8 +642,8 @@ void ConformanceTestSuite::TestPrematureEOFForType(FieldDescriptor::Type type) {
     string("abc")       // 32BIT
   };
 
-  const FieldDescriptor* field = GetFieldForType(type, false);
-  const FieldDescriptor* rep_field = GetFieldForType(type, true);
+  const FieldDescriptor* field = GetFieldForType(type, false, true);
+  const FieldDescriptor* rep_field = GetFieldForType(type, true, true);
   WireFormatLite::WireType wire_type = WireFormatLite::WireTypeForFieldType(
       static_cast<WireFormatLite::FieldType>(type));
   const string& incomplete = incompletes[wire_type];
@@ -640,44 +721,47 @@ void ConformanceTestSuite::TestPrematureEOFForType(FieldDescriptor::Type type) {
 void ConformanceTestSuite::TestValidDataForType(
     FieldDescriptor::Type type,
     std::vector<std::pair<std::string, std::string>> values) {
-  const string type_name =
-      UpperCase(string(".") + FieldDescriptor::TypeName(type));
-  WireFormatLite::WireType wire_type = WireFormatLite::WireTypeForFieldType(
-      static_cast<WireFormatLite::FieldType>(type));
-  const FieldDescriptor* field = GetFieldForType(type, false);
-  const FieldDescriptor* rep_field = GetFieldForType(type, true);
-
-  RunValidProtobufTest("ValidDataScalar" + type_name, REQUIRED,
-                       cat(tag(field->number(), wire_type), values[0].first),
-                       field->name() + ": " + values[0].second);
-
-  string proto;
-  string text = field->name() + ": " + values.back().second;
-  for (size_t i = 0; i < values.size(); i++) {
-    proto += cat(tag(field->number(), wire_type), values[i].first);
-  }
-  RunValidProtobufTest("RepeatedScalarSelectsLast" + type_name, REQUIRED,
-                       proto, text);
+  for (int isProto3 = 0; isProto3 < 2; isProto3++) {
+    const string type_name =
+        UpperCase(string(".") + FieldDescriptor::TypeName(type));
+    WireFormatLite::WireType wire_type = WireFormatLite::WireTypeForFieldType(
+        static_cast<WireFormatLite::FieldType>(type));
+    const FieldDescriptor* field = GetFieldForType(type, false, isProto3);
+    const FieldDescriptor* rep_field = GetFieldForType(type, true, isProto3);
+
+    RunValidProtobufTest("ValidDataScalar" + type_name, REQUIRED,
+                         cat(tag(field->number(), wire_type), values[0].first),
+                         field->name() + ": " + values[0].second, isProto3);
+
+    string proto;
+    string text = field->name() + ": " + values.back().second;
+    for (size_t i = 0; i < values.size(); i++) {
+      proto += cat(tag(field->number(), wire_type), values[i].first);
+    }
+    RunValidProtobufTest("RepeatedScalarSelectsLast" + type_name, REQUIRED,
+                         proto, text, isProto3);
 
-  proto.clear();
-  text.clear();
+    proto.clear();
+    text.clear();
 
-  for (size_t i = 0; i < values.size(); i++) {
-    proto += cat(tag(rep_field->number(), wire_type), values[i].first);
-    text += rep_field->name() + ": " + values[i].second + " ";
+    for (size_t i = 0; i < values.size(); i++) {
+      proto += cat(tag(rep_field->number(), wire_type), values[i].first);
+      text += rep_field->name() + ": " + values[i].second + " ";
+    }
+    RunValidProtobufTest("ValidDataRepeated" + type_name, REQUIRED,
+                         proto, text, isProto3);
   }
-  RunValidProtobufTest("ValidDataRepeated" + type_name, REQUIRED, proto, text);
 }
 
 void ConformanceTestSuite::SetFailureList(const string& filename,
-                                          const vector<string>& failure_list) {
+                                          const std::vector<string>& failure_list) {
   failure_list_filename_ = filename;
   expected_to_fail_.clear();
   std::copy(failure_list.begin(), failure_list.end(),
             std::inserter(expected_to_fail_, expected_to_fail_.end()));
 }
 
-bool ConformanceTestSuite::CheckSetEmpty(const set<string>& set_to_check,
+bool ConformanceTestSuite::CheckSetEmpty(const std::set<string>& set_to_check,
                                          const std::string& write_to_file,
                                          const std::string& msg) {
   if (set_to_check.empty()) {
@@ -685,7 +769,7 @@ bool ConformanceTestSuite::CheckSetEmpty(const set<string>& set_to_check,
   } else {
     StringAppendF(&output_, "\n");
     StringAppendF(&output_, "%s\n\n", msg.c_str());
-    for (set<string>::const_iterator iter = set_to_check.begin();
+    for (std::set<string>::const_iterator iter = set_to_check.begin();
          iter != set_to_check.end(); ++iter) {
       StringAppendF(&output_, "  %s\n", iter->c_str());
     }
@@ -694,7 +778,7 @@ bool ConformanceTestSuite::CheckSetEmpty(const set<string>& set_to_check,
     if (!write_to_file.empty()) {
       std::ofstream os(write_to_file);
       if (os) {
-        for (set<string>::const_iterator iter = set_to_check.begin();
+        for (std::set<string>::const_iterator iter = set_to_check.begin();
              iter != set_to_check.end(); ++iter) {
           os << *iter << "\n";
         }
@@ -708,6 +792,68 @@ bool ConformanceTestSuite::CheckSetEmpty(const set<string>& set_to_check,
   }
 }
 
+// TODO: proto2?
+void ConformanceTestSuite::TestIllegalTags() {
+  // field num 0 is illegal
+  string nullfield[] = {
+    "\1DEADBEEF",
+    "\2\1\1",
+    "\3\4",
+    "\5DEAD"
+  };
+  for (int i = 0; i < 4; i++) {
+    string name = "IllegalZeroFieldNum_Case_0";
+    name.back() += i;
+    ExpectParseFailureForProto(nullfield[i], name, REQUIRED);
+  }
+}
+template <class MessageType>
+void ConformanceTestSuite::TestOneofMessage (MessageType &message,
+                                             bool isProto3) {
+  message.set_oneof_uint32(0);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroUint32", RECOMMENDED, &message, "oneof_uint32: 0", isProto3);
+  message.mutable_oneof_nested_message()->set_a(0);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroMessage", RECOMMENDED, &message,
+      isProto3 ? "oneof_nested_message: {}" : "oneof_nested_message: {a: 0}",
+      isProto3);
+  message.mutable_oneof_nested_message()->set_a(1);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroMessageSetTwice", RECOMMENDED, &message,
+      "oneof_nested_message: {a: 1}",
+      isProto3);
+  message.set_oneof_string("");
+  RunValidProtobufTestWithMessage(
+      "OneofZeroString", RECOMMENDED, &message, "oneof_string: \"\"", isProto3);
+  message.set_oneof_bytes("");
+  RunValidProtobufTestWithMessage(
+      "OneofZeroBytes", RECOMMENDED, &message, "oneof_bytes: \"\"", isProto3);
+  message.set_oneof_bool(false);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroBool", RECOMMENDED, &message, "oneof_bool: false", isProto3);
+  message.set_oneof_uint64(0);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroUint64", RECOMMENDED, &message, "oneof_uint64: 0", isProto3);
+  message.set_oneof_float(0.0f);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroFloat", RECOMMENDED, &message, "oneof_float: 0", isProto3);
+  message.set_oneof_double(0.0);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroDouble", RECOMMENDED, &message, "oneof_double: 0", isProto3);
+  message.set_oneof_enum(MessageType::FOO);
+  RunValidProtobufTestWithMessage(
+      "OneofZeroEnum", RECOMMENDED, &message, "oneof_enum: FOO", isProto3);
+}
+
+template <class MessageType>
+void ConformanceTestSuite::TestUnknownMessage(MessageType& message,
+                                              bool isProto3) {
+  message.ParseFromString("\xA8\x1F\x01");
+  RunValidBinaryProtobufTest("UnknownVarint", REQUIRED,
+                             message.SerializeAsString(), isProto3);
+}
+
 bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
                                     std::string* output) {
   runner_ = runner;
@@ -719,7 +865,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
   unexpected_succeeding_tests_.clear();
   type_resolver_.reset(NewTypeResolverForDescriptorPool(
       kTypeUrlPrefix, DescriptorPool::generated_pool()));
-  type_url_ = GetTypeUrl(TestAllTypes::descriptor());
+  type_url_ = GetTypeUrl(TestAllTypesProto3::descriptor());
 
   output_ = "\nCONFORMANCE TEST BEGIN ====================================\n\n";
 
@@ -728,6 +874,8 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
     TestPrematureEOFForType(static_cast<FieldDescriptor::Type>(i));
   }
 
+  TestIllegalTags();
+
   int64 kInt64Min = -9223372036854775808ULL;
   int64 kInt64Max = 9223372036854775807ULL;
   uint64 kUint64Max = 18446744073709551615ULL;
@@ -742,6 +890,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
   });
   TestValidDataForType(FieldDescriptor::TYPE_FLOAT, {
     {flt(0.1), "0.1"},
+    {flt(1.00000075e-36), "1.00000075e-36"},
     {flt(3.402823e+38), "3.402823e+38"},  // 3.40282347e+38
     {flt(1.17549435e-38f), "1.17549435e-38"}
   });
@@ -1215,7 +1364,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "Int32FieldNegativeWithLeadingZero", REQUIRED,
       R"({"optionalInt32": -01})");
   // String values must follow the same syntax rule. Specifically leading
-  // or traling spaces are not allowed.
+  // or trailing spaces are not allowed.
   ExpectParseFailureForJson(
       "Int32FieldLeadingSpace", REQUIRED,
       R"({"optionalInt32": " 1"})");
@@ -1312,7 +1461,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "optional_float: -inf");
   // Non-cannonical Nan will be correctly normalized.
   {
-    TestAllTypes message;
+    TestAllTypesProto3 message;
     // IEEE floating-point standard 32-bit quiet NaN:
     //   0111 1111 1xxx xxxx xxxx xxxx xxxx xxxx
     message.set_optional_float(
@@ -1384,7 +1533,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "optional_double: -inf");
   // Non-cannonical Nan will be correctly normalized.
   {
-    TestAllTypes message;
+    TestAllTypesProto3 message;
     message.set_optional_double(
         WireFormatLite::DecodeDouble(0x7FFA123456789ABCLL));
     RunValidJsonTestWithProtobufInput(
@@ -1499,9 +1648,10 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "BytesField", REQUIRED,
       R"({"optionalBytes": "AQI="})",
       R"(optional_bytes: "\x01\x02")");
-  ExpectParseFailureForJson(
-      "BytesFieldInvalidBase64Characters", REQUIRED,
-      R"({"optionalBytes": "-_=="})");
+  RunValidJsonTest(
+      "BytesFieldBase64Url", RECOMMENDED,
+      R"({"optionalBytes": "-_"})",
+      R"(optional_bytes: "\xfb")");
 
   // Message fields.
   RunValidJsonTest(
@@ -1514,36 +1664,10 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "OneofFieldDuplicate", REQUIRED,
       R"({"oneofUint32": 1, "oneofString": "test"})");
   // Ensure zero values for oneof make it out/backs.
-  {
-    TestAllTypes message;
-    message.set_oneof_uint32(0);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroUint32", RECOMMENDED, message, "oneof_uint32: 0");
-    message.mutable_oneof_nested_message()->set_a(0);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroMessage", RECOMMENDED, message, "oneof_nested_message: {}");
-    message.set_oneof_string("");
-    RunValidProtobufTestWithMessage(
-        "OneofZeroString", RECOMMENDED, message, "oneof_string: \"\"");
-    message.set_oneof_bytes("");
-    RunValidProtobufTestWithMessage(
-        "OneofZeroBytes", RECOMMENDED, message, "oneof_bytes: \"\"");
-    message.set_oneof_bool(false);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroBool", RECOMMENDED, message, "oneof_bool: false");
-    message.set_oneof_uint64(0);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroUint64", RECOMMENDED, message, "oneof_uint64: 0");
-    message.set_oneof_float(0.0f);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroFloat", RECOMMENDED, message, "oneof_float: 0");
-    message.set_oneof_double(0.0);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroDouble", RECOMMENDED, message, "oneof_double: 0");
-    message.set_oneof_enum(TestAllTypes::FOO);
-    RunValidProtobufTestWithMessage(
-        "OneofZeroEnum", RECOMMENDED, message, "oneof_enum: FOO");
-  }
+  TestAllTypesProto3 messageProto3;
+  TestAllTypesProto2 messageProto2;
+  TestOneofMessage(messageProto3, true);
+  TestOneofMessage(messageProto2, false);
   RunValidJsonTest(
       "OneofZeroUint32", RECOMMENDED,
       R"({"oneofUint32": 0})", "oneof_uint32: 0");
@@ -1718,6 +1842,14 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
         "optionalInt64": null,
         "optionalUint32": null,
         "optionalUint64": null,
+        "optionalSint32": null,
+        "optionalSint64": null,
+        "optionalFixed32": null,
+        "optionalFixed64": null,
+        "optionalSfixed32": null,
+        "optionalSfixed64": null,
+        "optionalFloat": null,
+        "optionalDouble": null,
         "optionalBool": null,
         "optionalString": null,
         "optionalBytes": null,
@@ -1727,6 +1859,14 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
         "repeatedInt64": null,
         "repeatedUint32": null,
         "repeatedUint64": null,
+        "repeatedSint32": null,
+        "repeatedSint64": null,
+        "repeatedFixed32": null,
+        "repeatedFixed64": null,
+        "repeatedSfixed32": null,
+        "repeatedSfixed64": null,
+        "repeatedFloat": null,
+        "repeatedDouble": null,
         "repeatedBool": null,
         "repeatedString": null,
         "repeatedBytes": null,
@@ -1766,6 +1906,18 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "StringFieldSingleQuoteBoth", RECOMMENDED,
       R"({'optionalString': 'Hello world!'})");
 
+  // Unknown fields.
+  {
+    TestAllTypesProto3 messageProto3;
+    TestAllTypesProto2 messageProto2;
+    //TODO(yilunchong): update this behavior when unknown field's behavior
+    // changed in open source. Also delete
+    // Required.Proto3.ProtobufInput.UnknownVarint.ProtobufOutput
+    // from failure list of python_cpp python java
+    TestUnknownMessage(messageProto3, true);
+    TestUnknownMessage(messageProto2, false);
+  }
+
   // Wrapper types.
   RunValidJsonTest(
       "OptionalBoolWrapper", REQUIRED,
@@ -1914,6 +2066,10 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       R"({"repeatedDuration": ["1.5s", "-1.5s"]})",
       "repeated_duration: {seconds: 1 nanos: 500000000}"
       "repeated_duration: {seconds: -1 nanos: -500000000}");
+  RunValidJsonTest(
+      "DurationNull", REQUIRED,
+      R"({"optionalDuration": null})",
+      "");
 
   ExpectParseFailureForJson(
       "DurationMissingS", REQUIRED,
@@ -1983,6 +2139,10 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "TimestampWithNegativeOffset", REQUIRED,
       R"({"optionalTimestamp": "1969-12-31T16:00:00-08:00"})",
       "optional_timestamp: {seconds: 0}");
+  RunValidJsonTest(
+      "TimestampNull", REQUIRED,
+      R"({"optionalTimestamp": null})",
+      "");
 
   ExpectParseFailureForJson(
       "TimestampJsonInputTooSmall", REQUIRED,
@@ -2165,6 +2325,24 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
         }
       )");
   RunValidJsonTest(
+      "ValueAcceptListWithNull", REQUIRED,
+      R"({"optionalValue": ["x", null, "y"]})",
+      R"(
+        optional_value: {
+          list_value: {
+            values: {
+              string_value: "x"
+            }
+            values: {
+              null_value: NULL_VALUE
+            }
+            values: {
+              string_value: "y"
+            }
+          }
+        }
+      )");
+  RunValidJsonTest(
       "ValueAcceptObject", REQUIRED,
       R"({"optionalValue": {"value": 1}})",
       R"(
@@ -2185,13 +2363,13 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       "Any", REQUIRED,
       R"({
         "optionalAny": {
-          "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes",
+          "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3",
           "optionalInt32": 12345
         }
       })",
       R"(
         optional_any: {
-          [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes] {
+          [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3] {
             optional_int32: 12345
           }
         }
@@ -2202,7 +2380,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
         "optionalAny": {
           "@type": "type.googleapis.com/google.protobuf.Any",
           "value": {
-            "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes",
+            "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3",
             "optionalInt32": 12345
           }
         }
@@ -2210,7 +2388,7 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       R"(
         optional_any: {
           [type.googleapis.com/google.protobuf.Any] {
-            [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes] {
+            [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3] {
               optional_int32: 12345
             }
           }
@@ -2222,12 +2400,12 @@ bool ConformanceTestSuite::RunSuite(ConformanceTestRunner* runner,
       R"({
         "optionalAny": {
           "optionalInt32": 12345,
-          "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes"
+          "@type": "type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3"
         }
       })",
       R"(
         optional_any: {
-          [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypes] {
+          [type.googleapis.com/protobuf_test_messages.proto3.TestAllTypesProto3] {
             optional_int32: 12345
           }
         }
diff --git a/conformance/conformance_test.h b/conformance/conformance_test.h
index 5f05a25b..2649f8b2 100644
--- a/conformance/conformance_test.h
+++ b/conformance/conformance_test.h
@@ -53,7 +53,7 @@ class ConformanceResponse;
 
 namespace protobuf_test_messages {
 namespace proto3 {
-class TestAllTypes;
+class TestAllTypesProto3;
 }  // namespace proto3
 }  // namespace protobuf_test_messages
 
@@ -165,7 +165,15 @@ class ConformanceTestSuite {
                          const string& input,
                          conformance::WireFormat input_format,
                          const string& equivalent_text_format,
-                         conformance::WireFormat requested_output);
+                         conformance::WireFormat requested_output,
+                         bool isProto3);
+  void RunValidBinaryInputTest(const string& test_name,
+                               ConformanceLevel level,
+                               const string& input,
+                               conformance::WireFormat input_format,
+                               const string& equivalent_wire_format,
+                               conformance::WireFormat requested_output,
+                               bool isProto3);
   void RunValidJsonTest(const string& test_name,
                         ConformanceLevel level,
                         const string& input_json,
@@ -173,15 +181,21 @@ class ConformanceTestSuite {
   void RunValidJsonTestWithProtobufInput(
       const string& test_name,
       ConformanceLevel level,
-      const protobuf_test_messages::proto3::TestAllTypes& input,
+      const protobuf_test_messages::proto3::TestAllTypesProto3& input,
       const string& equivalent_text_format);
   void RunValidProtobufTest(const string& test_name, ConformanceLevel level,
                             const string& input_protobuf,
-                            const string& equivalent_text_format);
+                            const string& equivalent_text_format,
+                            bool isProto3);
+  void RunValidBinaryProtobufTest(const string& test_name,
+                                  ConformanceLevel level,
+                                  const string& input_protobuf,
+                                  bool isProto3);
   void RunValidProtobufTestWithMessage(
       const string& test_name, ConformanceLevel level,
-      const protobuf_test_messages::proto3::TestAllTypes& input,
-      const string& equivalent_text_format);
+      const Message *input,
+      const string& equivalent_text_format,
+      bool isProto3);
 
   typedef std::function<bool(const Json::Value&)> Validator;
   void RunValidJsonTestWithValidator(const string& test_name,
@@ -194,6 +208,10 @@ class ConformanceTestSuite {
   void ExpectSerializeFailureForJson(const string& test_name,
                                      ConformanceLevel level,
                                      const string& text_format);
+  void ExpectParseFailureForProtoWithProtoVersion (const string& proto,
+                                                   const string& test_name,
+                                                   ConformanceLevel level,
+                                                   bool isProto3);
   void ExpectParseFailureForProto(const std::string& proto,
                                   const std::string& test_name,
                                   ConformanceLevel level);
@@ -201,10 +219,17 @@ class ConformanceTestSuite {
                                       const std::string& test_name,
                                       ConformanceLevel level);
   void TestPrematureEOFForType(google::protobuf::FieldDescriptor::Type type);
+  void TestIllegalTags();
+  template <class MessageType>
+  void TestOneofMessage (MessageType &message,
+                         bool isProto3);
+  template <class MessageType>
+  void TestUnknownMessage (MessageType &message,
+                           bool isProto3);
   void TestValidDataForType(
       google::protobuf::FieldDescriptor::Type,
       std::vector<std::pair<std::string, std::string>> values);
-  bool CheckSetEmpty(const set<string>& set_to_check,
+  bool CheckSetEmpty(const std::set<string>& set_to_check,
                      const std::string& write_to_file, const std::string& msg);
   ConformanceTestRunner* runner_;
   int successes_;
@@ -231,8 +256,7 @@ class ConformanceTestSuite {
   // The set of tests that the testee opted out of;
   std::set<std::string> skipped_;
 
-  google::protobuf::internal::scoped_ptr<google::protobuf::util::TypeResolver>
-      type_resolver_;
+  std::unique_ptr<google::protobuf::util::TypeResolver> type_resolver_;
   std::string type_url_;
 };
 
diff --git a/conformance/conformance_test_runner.cc b/conformance/conformance_test_runner.cc
index 7e91d388..b0357b87 100644
--- a/conformance/conformance_test_runner.cc
+++ b/conformance/conformance_test_runner.cc
@@ -68,7 +68,6 @@
 
 using conformance::ConformanceRequest;
 using conformance::ConformanceResponse;
-using google::protobuf::internal::scoped_array;
 using google::protobuf::StringAppendF;
 using std::string;
 using std::vector;
@@ -183,7 +182,7 @@ class ForkPipeRunner : public google::protobuf::ConformanceTestRunner {
       CHECK_SYSCALL(close(toproc_pipe_fd[1]));
       CHECK_SYSCALL(close(fromproc_pipe_fd[0]));
 
-      scoped_array<char> executable(new char[executable_.size() + 1]);
+      std::unique_ptr<char[]> executable(new char[executable_.size() + 1]);
       memcpy(executable.get(), executable_.c_str(), executable_.size());
       executable[executable_.size()] = '\0';
 
@@ -264,7 +263,7 @@ void UsageError() {
   exit(1);
 }
 
-void ParseFailureList(const char *filename, vector<string>* failure_list) {
+void ParseFailureList(const char *filename, std::vector<string>* failure_list) {
   std::ifstream infile(filename);
 
   if (!infile.is_open()) {
@@ -291,7 +290,7 @@ int main(int argc, char *argv[]) {
   google::protobuf::ConformanceTestSuite suite;
 
   string failure_list_filename;
-  vector<string> failure_list;
+  std::vector<string> failure_list;
 
   for (int arg = 1; arg < argc; ++arg) {
     if (strcmp(argv[arg], "--failure_list") == 0) {
diff --git a/conformance/failure_list_cpp.txt b/conformance/failure_list_cpp.txt
index 8cfd74da..752fbb5d 100644
--- a/conformance/failure_list_cpp.txt
+++ b/conformance/failure_list_cpp.txt
@@ -10,37 +10,47 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
-Recommended.JsonInput.BoolFieldDoubleQuotedFalse
-Recommended.JsonInput.BoolFieldDoubleQuotedTrue
-Recommended.JsonInput.FieldMaskInvalidCharacter
-Recommended.JsonInput.FieldNameDuplicate
-Recommended.JsonInput.FieldNameDuplicateDifferentCasing1
-Recommended.JsonInput.FieldNameDuplicateDifferentCasing2
-Recommended.JsonInput.FieldNameNotQuoted
-Recommended.JsonInput.MapFieldValueIsNull
-Recommended.JsonInput.RepeatedFieldMessageElementIsNull
-Recommended.JsonInput.RepeatedFieldPrimitiveElementIsNull
-Recommended.JsonInput.RepeatedFieldTrailingComma
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithNewlines
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithSpace
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithSpaceCommaSpace
-Recommended.JsonInput.StringFieldSingleQuoteBoth
-Recommended.JsonInput.StringFieldSingleQuoteKey
-Recommended.JsonInput.StringFieldSingleQuoteValue
-Recommended.JsonInput.StringFieldUppercaseEscapeLetter
-Recommended.JsonInput.TrailingCommaInAnObject
-Recommended.JsonInput.TrailingCommaInAnObjectWithNewlines
-Recommended.JsonInput.TrailingCommaInAnObjectWithSpace
-Recommended.JsonInput.TrailingCommaInAnObjectWithSpaceCommaSpace
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInPackedField.BOOL
-Required.ProtobufInput.PrematureEofInPackedField.ENUM
-Required.ProtobufInput.PrematureEofInPackedField.INT32
-Required.ProtobufInput.PrematureEofInPackedField.INT64
-Required.ProtobufInput.PrematureEofInPackedField.SINT32
-Required.ProtobufInput.PrematureEofInPackedField.SINT64
-Required.ProtobufInput.PrematureEofInPackedField.UINT32
-Required.ProtobufInput.PrematureEofInPackedField.UINT64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.MESSAGE
+Recommended.Proto3.JsonInput.BoolFieldDoubleQuotedFalse
+Recommended.Proto3.JsonInput.BoolFieldDoubleQuotedTrue
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
+Recommended.Proto3.JsonInput.FieldMaskInvalidCharacter
+Recommended.Proto3.JsonInput.FieldNameDuplicate
+Recommended.Proto3.JsonInput.FieldNameDuplicateDifferentCasing1
+Recommended.Proto3.JsonInput.FieldNameDuplicateDifferentCasing2
+Recommended.Proto3.JsonInput.FieldNameNotQuoted
+Recommended.Proto3.JsonInput.MapFieldValueIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldMessageElementIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldPrimitiveElementIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldTrailingComma
+Recommended.Proto3.JsonInput.RepeatedFieldTrailingCommaWithNewlines
+Recommended.Proto3.JsonInput.RepeatedFieldTrailingCommaWithSpace
+Recommended.Proto3.JsonInput.RepeatedFieldTrailingCommaWithSpaceCommaSpace
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteBoth
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteKey
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteValue
+Recommended.Proto3.JsonInput.StringFieldUppercaseEscapeLetter
+Recommended.Proto3.JsonInput.TrailingCommaInAnObject
+Recommended.Proto3.JsonInput.TrailingCommaInAnObjectWithNewlines
+Recommended.Proto3.JsonInput.TrailingCommaInAnObjectWithSpace
+Recommended.Proto3.JsonInput.TrailingCommaInAnObjectWithSpaceCommaSpace
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.BOOL
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.ENUM
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.INT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.INT64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SINT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SINT64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.UINT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.UINT64
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.BOOL
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.ENUM
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.INT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.INT64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SINT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SINT64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.UINT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.UINT64
diff --git a/conformance/failure_list_csharp.txt b/conformance/failure_list_csharp.txt
index e69de29b..2a20aa78 100644
--- a/conformance/failure_list_csharp.txt
+++ b/conformance/failure_list_csharp.txt
@@ -0,0 +1,2 @@
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
diff --git a/conformance/failure_list_java.txt b/conformance/failure_list_java.txt
index 632940ef..dc1f9ba5 100644
--- a/conformance/failure_list_java.txt
+++ b/conformance/failure_list_java.txt
@@ -7,39 +7,41 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
-Recommended.JsonInput.BoolFieldAllCapitalFalse
-Recommended.JsonInput.BoolFieldAllCapitalTrue
-Recommended.JsonInput.BoolFieldCamelCaseFalse
-Recommended.JsonInput.BoolFieldCamelCaseTrue
-Recommended.JsonInput.BoolFieldDoubleQuotedFalse
-Recommended.JsonInput.BoolFieldDoubleQuotedTrue
-Recommended.JsonInput.BoolMapFieldKeyNotQuoted
-Recommended.JsonInput.DoubleFieldInfinityNotQuoted
-Recommended.JsonInput.DoubleFieldNanNotQuoted
-Recommended.JsonInput.DoubleFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.FieldMaskInvalidCharacter
-Recommended.JsonInput.FieldNameDuplicate
-Recommended.JsonInput.FieldNameNotQuoted
-Recommended.JsonInput.FloatFieldInfinityNotQuoted
-Recommended.JsonInput.FloatFieldNanNotQuoted
-Recommended.JsonInput.FloatFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.Int32MapFieldKeyNotQuoted
-Recommended.JsonInput.Int64MapFieldKeyNotQuoted
-Recommended.JsonInput.JsonWithComments
-Recommended.JsonInput.StringFieldSingleQuoteBoth
-Recommended.JsonInput.StringFieldSingleQuoteKey
-Recommended.JsonInput.StringFieldSingleQuoteValue
-Recommended.JsonInput.StringFieldSurrogateInWrongOrder
-Recommended.JsonInput.StringFieldUnpairedHighSurrogate
-Recommended.JsonInput.StringFieldUnpairedLowSurrogate
-Recommended.JsonInput.Uint32MapFieldKeyNotQuoted
-Recommended.JsonInput.Uint64MapFieldKeyNotQuoted
-Required.JsonInput.EnumFieldNotQuoted
-Required.JsonInput.Int32FieldLeadingZero
-Required.JsonInput.Int32FieldNegativeWithLeadingZero
-Required.JsonInput.Int32FieldPlusSign
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotBool
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
-Required.JsonInput.StringFieldNotAString
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Recommended.Proto3.JsonInput.BoolFieldAllCapitalFalse
+Recommended.Proto3.JsonInput.BoolFieldAllCapitalTrue
+Recommended.Proto3.JsonInput.BoolFieldCamelCaseFalse
+Recommended.Proto3.JsonInput.BoolFieldCamelCaseTrue
+Recommended.Proto3.JsonInput.BoolFieldDoubleQuotedFalse
+Recommended.Proto3.JsonInput.BoolFieldDoubleQuotedTrue
+Recommended.Proto3.JsonInput.BoolMapFieldKeyNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNanNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNegativeInfinityNotQuoted
+Recommended.Proto3.JsonInput.FieldMaskInvalidCharacter
+Recommended.Proto3.JsonInput.FieldNameDuplicate
+Recommended.Proto3.JsonInput.FieldNameNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNanNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNegativeInfinityNotQuoted
+Recommended.Proto3.JsonInput.Int32MapFieldKeyNotQuoted
+Recommended.Proto3.JsonInput.Int64MapFieldKeyNotQuoted
+Recommended.Proto3.JsonInput.JsonWithComments
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteBoth
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteKey
+Recommended.Proto3.JsonInput.StringFieldSingleQuoteValue
+Recommended.Proto3.JsonInput.StringFieldSurrogateInWrongOrder
+Recommended.Proto3.JsonInput.StringFieldUnpairedHighSurrogate
+Recommended.Proto3.JsonInput.StringFieldUnpairedLowSurrogate
+Recommended.Proto3.JsonInput.Uint32MapFieldKeyNotQuoted
+Recommended.Proto3.JsonInput.Uint64MapFieldKeyNotQuoted
+Required.Proto3.JsonInput.EnumFieldNotQuoted
+Required.Proto3.JsonInput.Int32FieldLeadingZero
+Required.Proto3.JsonInput.Int32FieldNegativeWithLeadingZero
+Required.Proto3.JsonInput.Int32FieldPlusSign
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotBool
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
+Required.Proto3.JsonInput.StringFieldNotAString
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
diff --git a/conformance/failure_list_js.txt b/conformance/failure_list_js.txt
new file mode 100644
index 00000000..f8f6a578
--- /dev/null
+++ b/conformance/failure_list_js.txt
@@ -0,0 +1,13 @@
+Required.Proto3.ProtobufInput.ValidDataRepeated.BOOL.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.DOUBLE.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.FIXED32.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.FIXED64.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.FLOAT.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.INT32.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.INT64.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.SFIXED32.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.SFIXED64.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.SINT32.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.SINT64.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.UINT32.ProtobufOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.UINT64.ProtobufOutput
diff --git a/conformance/failure_list_objc.txt b/conformance/failure_list_objc.txt
index dd538c10..e34501ea 100644
--- a/conformance/failure_list_objc.txt
+++ b/conformance/failure_list_objc.txt
@@ -1,4 +1,2 @@
-# All tests currently passing.
-#
 # JSON input or output tests are skipped (in conformance_objc.m) as mobile
 # platforms don't support JSON wire format to avoid code bloat.
diff --git a/conformance/failure_list_php.txt b/conformance/failure_list_php.txt
index 6dd93918..0d234112 100644
--- a/conformance/failure_list_php.txt
+++ b/conformance/failure_list_php.txt
@@ -1,611 +1,20 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
-Recommended.JsonInput.BoolFieldAllCapitalFalse
-Recommended.JsonInput.BoolFieldAllCapitalTrue
-Recommended.JsonInput.BoolFieldCamelCaseFalse
-Recommended.JsonInput.BoolFieldCamelCaseTrue
-Recommended.JsonInput.BoolFieldDoubleQuotedFalse
-Recommended.JsonInput.BoolFieldDoubleQuotedTrue
-Recommended.JsonInput.BoolFieldIntegerOne
-Recommended.JsonInput.BoolFieldIntegerZero
-Recommended.JsonInput.BoolMapFieldKeyNotQuoted
-Recommended.JsonInput.DoubleFieldInfinityNotQuoted
-Recommended.JsonInput.DoubleFieldNanNotQuoted
-Recommended.JsonInput.DoubleFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.DurationHas3FractionalDigits.Validator
-Recommended.JsonInput.DurationHas6FractionalDigits.Validator
-Recommended.JsonInput.DurationHas9FractionalDigits.Validator
-Recommended.JsonInput.DurationHasZeroFractionalDigit.Validator
-Recommended.JsonInput.FieldMaskInvalidCharacter
-Recommended.JsonInput.FieldNameDuplicate
-Recommended.JsonInput.FieldNameDuplicateDifferentCasing1
-Recommended.JsonInput.FieldNameDuplicateDifferentCasing2
-Recommended.JsonInput.FieldNameNotQuoted
-Recommended.JsonInput.FieldNameWithDoubleUnderscores.JsonOutput
-Recommended.JsonInput.FieldNameWithDoubleUnderscores.ProtobufOutput
-Recommended.JsonInput.FieldNameWithDoubleUnderscores.Validator
-Recommended.JsonInput.FloatFieldInfinityNotQuoted
-Recommended.JsonInput.FloatFieldNanNotQuoted
-Recommended.JsonInput.FloatFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.Int32MapFieldKeyNotQuoted
-Recommended.JsonInput.Int64FieldBeString.Validator
-Recommended.JsonInput.Int64MapFieldKeyNotQuoted
-Recommended.JsonInput.JsonWithComments
-Recommended.JsonInput.MapFieldKeyIsNull
-Recommended.JsonInput.MapFieldValueIsNull
-Recommended.JsonInput.MissingCommaMultiline
-Recommended.JsonInput.MissingCommaOneLine
-Recommended.JsonInput.MultilineNoSpaces.JsonOutput
-Recommended.JsonInput.MultilineNoSpaces.ProtobufOutput
-Recommended.JsonInput.MultilineWithSpaces.JsonOutput
-Recommended.JsonInput.MultilineWithSpaces.ProtobufOutput
-Recommended.JsonInput.OneLineNoSpaces.JsonOutput
-Recommended.JsonInput.OneLineNoSpaces.ProtobufOutput
-Recommended.JsonInput.OneLineWithSpaces.JsonOutput
-Recommended.JsonInput.OneLineWithSpaces.ProtobufOutput
-Recommended.JsonInput.OneofZeroBool.JsonOutput
-Recommended.JsonInput.OneofZeroBool.ProtobufOutput
-Recommended.JsonInput.OneofZeroBytes.JsonOutput
-Recommended.JsonInput.OneofZeroBytes.ProtobufOutput
-Recommended.JsonInput.OneofZeroDouble.JsonOutput
-Recommended.JsonInput.OneofZeroDouble.ProtobufOutput
-Recommended.JsonInput.OneofZeroEnum.JsonOutput
-Recommended.JsonInput.OneofZeroEnum.ProtobufOutput
-Recommended.JsonInput.OneofZeroFloat.JsonOutput
-Recommended.JsonInput.OneofZeroFloat.ProtobufOutput
-Recommended.JsonInput.OneofZeroMessage.JsonOutput
-Recommended.JsonInput.OneofZeroMessage.ProtobufOutput
-Recommended.JsonInput.OneofZeroString.JsonOutput
-Recommended.JsonInput.OneofZeroString.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint32.JsonOutput
-Recommended.JsonInput.OneofZeroUint32.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint64.JsonOutput
-Recommended.JsonInput.OneofZeroUint64.ProtobufOutput
-Recommended.JsonInput.RepeatedFieldMessageElementIsNull
-Recommended.JsonInput.RepeatedFieldPrimitiveElementIsNull
-Recommended.JsonInput.RepeatedFieldTrailingComma
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithNewlines
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithSpace
-Recommended.JsonInput.RepeatedFieldTrailingCommaWithSpaceCommaSpace
-Recommended.JsonInput.StringEndsWithEscapeChar
-Recommended.JsonInput.StringFieldInvalidEscape
-Recommended.JsonInput.StringFieldSingleQuoteBoth
-Recommended.JsonInput.StringFieldSingleQuoteKey
-Recommended.JsonInput.StringFieldSingleQuoteValue
-Recommended.JsonInput.StringFieldSurrogateInWrongOrder
-Recommended.JsonInput.StringFieldUnpairedHighSurrogate
-Recommended.JsonInput.StringFieldUnpairedLowSurrogate
-Recommended.JsonInput.StringFieldUnterminatedEscape
-Recommended.JsonInput.StringFieldUppercaseEscapeLetter
-Recommended.JsonInput.TimestampHas3FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas6FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas9FractionalDigits.Validator
-Recommended.JsonInput.TimestampHasZeroFractionalDigit.Validator
-Recommended.JsonInput.TimestampZeroNormalized.Validator
-Recommended.JsonInput.TrailingCommaInAnObject
-Recommended.JsonInput.TrailingCommaInAnObjectWithNewlines
-Recommended.JsonInput.TrailingCommaInAnObjectWithSpace
-Recommended.JsonInput.TrailingCommaInAnObjectWithSpaceCommaSpace
-Recommended.JsonInput.Uint32MapFieldKeyNotQuoted
-Recommended.JsonInput.Uint64FieldBeString.Validator
-Recommended.JsonInput.Uint64MapFieldKeyNotQuoted
-Recommended.ProtobufInput.OneofZeroBool.JsonOutput
-Recommended.ProtobufInput.OneofZeroBool.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroBytes.JsonOutput
-Recommended.ProtobufInput.OneofZeroBytes.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroDouble.JsonOutput
-Recommended.ProtobufInput.OneofZeroDouble.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroEnum.JsonOutput
-Recommended.ProtobufInput.OneofZeroEnum.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroFloat.JsonOutput
-Recommended.ProtobufInput.OneofZeroFloat.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroMessage.JsonOutput
-Recommended.ProtobufInput.OneofZeroMessage.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroString.JsonOutput
-Recommended.ProtobufInput.OneofZeroString.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroUint32.JsonOutput
-Recommended.ProtobufInput.OneofZeroUint32.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroUint64.JsonOutput
-Recommended.ProtobufInput.OneofZeroUint64.ProtobufOutput
-Required.DurationProtoInputTooLarge.JsonOutput
-Required.DurationProtoInputTooSmall.JsonOutput
-Required.JsonInput.AllFieldAcceptNull.JsonOutput
-Required.JsonInput.AllFieldAcceptNull.ProtobufOutput
-Required.JsonInput.Any.JsonOutput
-Required.JsonInput.Any.ProtobufOutput
-Required.JsonInput.AnyNested.JsonOutput
-Required.JsonInput.AnyNested.ProtobufOutput
-Required.JsonInput.AnyUnorderedTypeTag.JsonOutput
-Required.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
-Required.JsonInput.AnyWithDuration.JsonOutput
-Required.JsonInput.AnyWithDuration.ProtobufOutput
-Required.JsonInput.AnyWithFieldMask.JsonOutput
-Required.JsonInput.AnyWithFieldMask.ProtobufOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
-Required.JsonInput.AnyWithStruct.JsonOutput
-Required.JsonInput.AnyWithStruct.ProtobufOutput
-Required.JsonInput.AnyWithTimestamp.JsonOutput
-Required.JsonInput.AnyWithTimestamp.ProtobufOutput
-Required.JsonInput.AnyWithValueForInteger.JsonOutput
-Required.JsonInput.AnyWithValueForInteger.ProtobufOutput
-Required.JsonInput.AnyWithValueForJsonObject.JsonOutput
-Required.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
-Required.JsonInput.BoolFieldFalse.JsonOutput
-Required.JsonInput.BoolFieldFalse.ProtobufOutput
-Required.JsonInput.BoolFieldTrue.JsonOutput
-Required.JsonInput.BoolFieldTrue.ProtobufOutput
-Required.JsonInput.BoolMapEscapedKey.JsonOutput
-Required.JsonInput.BoolMapEscapedKey.ProtobufOutput
-Required.JsonInput.BoolMapField.JsonOutput
-Required.JsonInput.BoolMapField.ProtobufOutput
-Required.JsonInput.BytesField.JsonOutput
-Required.JsonInput.BytesField.ProtobufOutput
-Required.JsonInput.BytesFieldInvalidBase64Characters
-Required.JsonInput.BytesRepeatedField.JsonOutput
-Required.JsonInput.BytesRepeatedField.ProtobufOutput
-Required.JsonInput.DoubleFieldInfinity.JsonOutput
-Required.JsonInput.DoubleFieldInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldNan.JsonOutput
-Required.JsonInput.DoubleFieldNan.ProtobufOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.JsonOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldQuotedValue.JsonOutput
-Required.JsonInput.DoubleFieldQuotedValue.ProtobufOutput
-Required.JsonInput.DoubleFieldTooLarge
-Required.JsonInput.DoubleFieldTooSmall
-Required.JsonInput.DurationJsonInputTooLarge
-Required.JsonInput.DurationJsonInputTooSmall
-Required.JsonInput.DurationMaxValue.JsonOutput
-Required.JsonInput.DurationMaxValue.ProtobufOutput
-Required.JsonInput.DurationMinValue.JsonOutput
-Required.JsonInput.DurationMinValue.ProtobufOutput
-Required.JsonInput.DurationMissingS
-Required.JsonInput.DurationRepeatedValue.JsonOutput
-Required.JsonInput.DurationRepeatedValue.ProtobufOutput
-Required.JsonInput.EnumField.JsonOutput
-Required.JsonInput.EnumField.ProtobufOutput
-Required.JsonInput.EnumFieldNotQuoted
-Required.JsonInput.EnumFieldNumericValueNonZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
-Required.JsonInput.EnumFieldNumericValueZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueZero.ProtobufOutput
-Required.JsonInput.EnumFieldUnknownValue.Validator
-Required.JsonInput.EnumRepeatedField.JsonOutput
-Required.JsonInput.EnumRepeatedField.ProtobufOutput
-Required.JsonInput.FieldMask.JsonOutput
-Required.JsonInput.FieldMask.ProtobufOutput
-Required.JsonInput.FieldNameEscaped.JsonOutput
-Required.JsonInput.FieldNameEscaped.ProtobufOutput
-Required.JsonInput.FieldNameInLowerCamelCase.Validator
-Required.JsonInput.FieldNameInSnakeCase.JsonOutput
-Required.JsonInput.FieldNameInSnakeCase.ProtobufOutput
-Required.JsonInput.FieldNameWithMixedCases.JsonOutput
-Required.JsonInput.FieldNameWithMixedCases.ProtobufOutput
-Required.JsonInput.FieldNameWithMixedCases.Validator
-Required.JsonInput.FieldNameWithNumbers.JsonOutput
-Required.JsonInput.FieldNameWithNumbers.ProtobufOutput
-Required.JsonInput.FieldNameWithNumbers.Validator
-Required.JsonInput.FloatFieldInfinity.JsonOutput
-Required.JsonInput.FloatFieldInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldMaxNegativeValue.JsonOutput
-Required.JsonInput.FloatFieldMaxNegativeValue.ProtobufOutput
-Required.JsonInput.FloatFieldMaxPositiveValue.JsonOutput
-Required.JsonInput.FloatFieldMaxPositiveValue.ProtobufOutput
-Required.JsonInput.FloatFieldMinNegativeValue.JsonOutput
-Required.JsonInput.FloatFieldMinNegativeValue.ProtobufOutput
-Required.JsonInput.FloatFieldMinPositiveValue.JsonOutput
-Required.JsonInput.FloatFieldMinPositiveValue.ProtobufOutput
-Required.JsonInput.FloatFieldNan.JsonOutput
-Required.JsonInput.FloatFieldNan.ProtobufOutput
-Required.JsonInput.FloatFieldNegativeInfinity.JsonOutput
-Required.JsonInput.FloatFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldQuotedValue.JsonOutput
-Required.JsonInput.FloatFieldQuotedValue.ProtobufOutput
-Required.JsonInput.FloatFieldTooLarge
-Required.JsonInput.FloatFieldTooSmall
-Required.JsonInput.HelloWorld.JsonOutput
-Required.JsonInput.HelloWorld.ProtobufOutput
-Required.JsonInput.Int32FieldExponentialFormat.JsonOutput
-Required.JsonInput.Int32FieldExponentialFormat.ProtobufOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.JsonOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.ProtobufOutput
-Required.JsonInput.Int32FieldLeadingSpace
-Required.JsonInput.Int32FieldLeadingZero
-Required.JsonInput.Int32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldMaxValue.JsonOutput
-Required.JsonInput.Int32FieldMaxValue.ProtobufOutput
-Required.JsonInput.Int32FieldMinFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMinFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldMinValue.JsonOutput
-Required.JsonInput.Int32FieldMinValue.ProtobufOutput
-Required.JsonInput.Int32FieldNegativeWithLeadingZero
-Required.JsonInput.Int32FieldNotInteger
-Required.JsonInput.Int32FieldNotNumber
-Required.JsonInput.Int32FieldPlusSign
-Required.JsonInput.Int32FieldStringValue.JsonOutput
-Required.JsonInput.Int32FieldStringValue.ProtobufOutput
-Required.JsonInput.Int32FieldStringValueEscaped.JsonOutput
-Required.JsonInput.Int32FieldStringValueEscaped.ProtobufOutput
-Required.JsonInput.Int32FieldTooLarge
-Required.JsonInput.Int32FieldTooSmall
-Required.JsonInput.Int32FieldTrailingSpace
-Required.JsonInput.Int32MapEscapedKey.JsonOutput
-Required.JsonInput.Int32MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int32MapField.JsonOutput
-Required.JsonInput.Int32MapField.ProtobufOutput
-Required.JsonInput.Int64FieldMaxValue.JsonOutput
-Required.JsonInput.Int64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Int64FieldMaxValueNotQuoted.JsonOutput
-Required.JsonInput.Int64FieldMaxValueNotQuoted.ProtobufOutput
-Required.JsonInput.Int64FieldMinValue.JsonOutput
-Required.JsonInput.Int64FieldMinValue.ProtobufOutput
-Required.JsonInput.Int64FieldMinValueNotQuoted.JsonOutput
-Required.JsonInput.Int64FieldMinValueNotQuoted.ProtobufOutput
-Required.JsonInput.Int64FieldNotInteger
-Required.JsonInput.Int64FieldNotNumber
-Required.JsonInput.Int64FieldTooLarge
-Required.JsonInput.Int64FieldTooSmall
-Required.JsonInput.Int64MapEscapedKey.JsonOutput
-Required.JsonInput.Int64MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int64MapField.JsonOutput
-Required.JsonInput.Int64MapField.ProtobufOutput
-Required.JsonInput.MessageField.JsonOutput
-Required.JsonInput.MessageField.ProtobufOutput
-Required.JsonInput.MessageMapField.JsonOutput
-Required.JsonInput.MessageMapField.ProtobufOutput
-Required.JsonInput.MessageRepeatedField.JsonOutput
-Required.JsonInput.MessageRepeatedField.ProtobufOutput
-Required.JsonInput.OneofFieldDuplicate
-Required.JsonInput.OptionalBoolWrapper.JsonOutput
-Required.JsonInput.OptionalBoolWrapper.ProtobufOutput
-Required.JsonInput.OptionalBytesWrapper.JsonOutput
-Required.JsonInput.OptionalBytesWrapper.ProtobufOutput
-Required.JsonInput.OptionalDoubleWrapper.JsonOutput
-Required.JsonInput.OptionalDoubleWrapper.ProtobufOutput
-Required.JsonInput.OptionalFloatWrapper.JsonOutput
-Required.JsonInput.OptionalFloatWrapper.ProtobufOutput
-Required.JsonInput.OptionalInt32Wrapper.JsonOutput
-Required.JsonInput.OptionalInt32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalInt64Wrapper.JsonOutput
-Required.JsonInput.OptionalInt64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalStringWrapper.JsonOutput
-Required.JsonInput.OptionalStringWrapper.ProtobufOutput
-Required.JsonInput.OptionalUint32Wrapper.JsonOutput
-Required.JsonInput.OptionalUint32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalUint64Wrapper.JsonOutput
-Required.JsonInput.OptionalUint64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
-Required.JsonInput.OriginalProtoFieldName.JsonOutput
-Required.JsonInput.OriginalProtoFieldName.ProtobufOutput
-Required.JsonInput.PrimitiveRepeatedField.JsonOutput
-Required.JsonInput.PrimitiveRepeatedField.ProtobufOutput
-Required.JsonInput.RepeatedBoolWrapper.JsonOutput
-Required.JsonInput.RepeatedBoolWrapper.ProtobufOutput
-Required.JsonInput.RepeatedBytesWrapper.JsonOutput
-Required.JsonInput.RepeatedBytesWrapper.ProtobufOutput
-Required.JsonInput.RepeatedDoubleWrapper.JsonOutput
-Required.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotBool
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotMessage
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotString
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingMessagesGotBool
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingMessagesGotInt
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingMessagesGotString
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotBool
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotMessage
-Required.JsonInput.RepeatedFloatWrapper.JsonOutput
-Required.JsonInput.RepeatedFloatWrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt32Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt64Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedStringWrapper.JsonOutput
-Required.JsonInput.RepeatedStringWrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint32Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint64Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
-Required.JsonInput.StringField.JsonOutput
-Required.JsonInput.StringField.ProtobufOutput
-Required.JsonInput.StringFieldEscape.JsonOutput
-Required.JsonInput.StringFieldEscape.ProtobufOutput
-Required.JsonInput.StringFieldNotAString
-Required.JsonInput.StringFieldSurrogatePair.JsonOutput
-Required.JsonInput.StringFieldSurrogatePair.ProtobufOutput
-Required.JsonInput.StringFieldUnicode.JsonOutput
-Required.JsonInput.StringFieldUnicode.ProtobufOutput
-Required.JsonInput.StringFieldUnicodeEscape.JsonOutput
-Required.JsonInput.StringFieldUnicodeEscape.ProtobufOutput
-Required.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.JsonOutput
-Required.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.ProtobufOutput
-Required.JsonInput.StringRepeatedField.JsonOutput
-Required.JsonInput.StringRepeatedField.ProtobufOutput
-Required.JsonInput.Struct.JsonOutput
-Required.JsonInput.Struct.ProtobufOutput
-Required.JsonInput.TimestampJsonInputLowercaseT
-Required.JsonInput.TimestampJsonInputLowercaseZ
-Required.JsonInput.TimestampJsonInputMissingT
-Required.JsonInput.TimestampJsonInputMissingZ
-Required.JsonInput.TimestampJsonInputTooLarge
-Required.JsonInput.TimestampJsonInputTooSmall
-Required.JsonInput.TimestampMaxValue.JsonOutput
-Required.JsonInput.TimestampMaxValue.ProtobufOutput
-Required.JsonInput.TimestampMinValue.JsonOutput
-Required.JsonInput.TimestampMinValue.ProtobufOutput
-Required.JsonInput.TimestampRepeatedValue.JsonOutput
-Required.JsonInput.TimestampRepeatedValue.ProtobufOutput
-Required.JsonInput.TimestampWithNegativeOffset.JsonOutput
-Required.JsonInput.TimestampWithNegativeOffset.ProtobufOutput
-Required.JsonInput.TimestampWithPositiveOffset.JsonOutput
-Required.JsonInput.TimestampWithPositiveOffset.ProtobufOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Uint32FieldMaxValue.JsonOutput
-Required.JsonInput.Uint32FieldMaxValue.ProtobufOutput
-Required.JsonInput.Uint32FieldNotInteger
-Required.JsonInput.Uint32FieldNotNumber
-Required.JsonInput.Uint32FieldTooLarge
-Required.JsonInput.Uint32MapField.JsonOutput
-Required.JsonInput.Uint32MapField.ProtobufOutput
-Required.JsonInput.Uint64FieldMaxValue.JsonOutput
-Required.JsonInput.Uint64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Uint64FieldMaxValueNotQuoted.JsonOutput
-Required.JsonInput.Uint64FieldMaxValueNotQuoted.ProtobufOutput
-Required.JsonInput.Uint64FieldNotInteger
-Required.JsonInput.Uint64FieldNotNumber
-Required.JsonInput.Uint64FieldTooLarge
-Required.JsonInput.Uint64MapField.JsonOutput
-Required.JsonInput.Uint64MapField.ProtobufOutput
-Required.JsonInput.ValueAcceptBool.JsonOutput
-Required.JsonInput.ValueAcceptBool.ProtobufOutput
-Required.JsonInput.ValueAcceptFloat.JsonOutput
-Required.JsonInput.ValueAcceptFloat.ProtobufOutput
-Required.JsonInput.ValueAcceptInteger.JsonOutput
-Required.JsonInput.ValueAcceptInteger.ProtobufOutput
-Required.JsonInput.ValueAcceptList.JsonOutput
-Required.JsonInput.ValueAcceptList.ProtobufOutput
-Required.JsonInput.ValueAcceptNull.JsonOutput
-Required.JsonInput.ValueAcceptNull.ProtobufOutput
-Required.JsonInput.ValueAcceptObject.JsonOutput
-Required.JsonInput.ValueAcceptObject.ProtobufOutput
-Required.JsonInput.ValueAcceptString.JsonOutput
-Required.JsonInput.ValueAcceptString.ProtobufOutput
-Required.JsonInput.WrapperTypesWithNullValue.JsonOutput
-Required.JsonInput.WrapperTypesWithNullValue.ProtobufOutput
-Required.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.BOOL
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.DOUBLE
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.ENUM
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.FIXED32
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.FIXED64
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.FLOAT
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.INT32
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.INT64
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.SFIXED32
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.SFIXED64
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.SINT32
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.SINT64
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.UINT32
-Required.ProtobufInput.PrematureEofBeforeKnownNonRepeatedValue.UINT64
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.BOOL
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.DOUBLE
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.ENUM
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.FIXED32
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.FIXED64
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.FLOAT
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.INT32
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.INT64
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.SFIXED32
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.SFIXED64
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.SINT32
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.SINT64
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.UINT32
-Required.ProtobufInput.PrematureEofBeforeKnownRepeatedValue.UINT64
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.BOOL
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.BYTES
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.DOUBLE
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.ENUM
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.FIXED32
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.FIXED64
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.FLOAT
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.INT32
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.INT64
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.MESSAGE
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.SFIXED32
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.SFIXED64
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.SINT32
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.SINT64
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.STRING
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.UINT32
-Required.ProtobufInput.PrematureEofBeforeUnknownValue.UINT64
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofInDelimitedDataForUnknownValue.BYTES
-Required.ProtobufInput.PrematureEofInDelimitedDataForUnknownValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForUnknownValue.STRING
-Required.ProtobufInput.PrematureEofInPackedField.BOOL
-Required.ProtobufInput.PrematureEofInPackedField.DOUBLE
-Required.ProtobufInput.PrematureEofInPackedField.ENUM
-Required.ProtobufInput.PrematureEofInPackedField.FIXED32
-Required.ProtobufInput.PrematureEofInPackedField.FIXED64
-Required.ProtobufInput.PrematureEofInPackedField.FLOAT
-Required.ProtobufInput.PrematureEofInPackedField.INT32
-Required.ProtobufInput.PrematureEofInPackedField.INT64
-Required.ProtobufInput.PrematureEofInPackedField.SFIXED32
-Required.ProtobufInput.PrematureEofInPackedField.SFIXED64
-Required.ProtobufInput.PrematureEofInPackedField.SINT32
-Required.ProtobufInput.PrematureEofInPackedField.SINT64
-Required.ProtobufInput.PrematureEofInPackedField.UINT32
-Required.ProtobufInput.PrematureEofInPackedField.UINT64
-Required.ProtobufInput.PrematureEofInPackedFieldValue.BOOL
-Required.ProtobufInput.PrematureEofInPackedFieldValue.DOUBLE
-Required.ProtobufInput.PrematureEofInPackedFieldValue.ENUM
-Required.ProtobufInput.PrematureEofInPackedFieldValue.FIXED32
-Required.ProtobufInput.PrematureEofInPackedFieldValue.FIXED64
-Required.ProtobufInput.PrematureEofInPackedFieldValue.FLOAT
-Required.ProtobufInput.PrematureEofInPackedFieldValue.INT32
-Required.ProtobufInput.PrematureEofInPackedFieldValue.INT64
-Required.ProtobufInput.PrematureEofInPackedFieldValue.SFIXED32
-Required.ProtobufInput.PrematureEofInPackedFieldValue.SFIXED64
-Required.ProtobufInput.PrematureEofInPackedFieldValue.SINT32
-Required.ProtobufInput.PrematureEofInPackedFieldValue.SINT64
-Required.ProtobufInput.PrematureEofInPackedFieldValue.UINT32
-Required.ProtobufInput.PrematureEofInPackedFieldValue.UINT64
-Required.ProtobufInput.PrematureEofInSubmessageValue.MESSAGE
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.BOOL
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.DOUBLE
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.ENUM
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.FIXED32
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.FIXED64
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.FLOAT
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.INT32
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.INT64
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.SFIXED32
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.SFIXED64
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.SINT32
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.SINT64
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.UINT32
-Required.ProtobufInput.PrematureEofInsideKnownNonRepeatedValue.UINT64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.BOOL
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.BYTES
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.DOUBLE
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.ENUM
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.FIXED32
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.FIXED64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.FLOAT
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.INT32
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.INT64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.SFIXED32
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.SFIXED64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.SINT32
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.SINT64
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.STRING
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.UINT32
-Required.ProtobufInput.PrematureEofInsideKnownRepeatedValue.UINT64
-Required.ProtobufInput.PrematureEofInsideUnknownValue.BOOL
-Required.ProtobufInput.PrematureEofInsideUnknownValue.BYTES
-Required.ProtobufInput.PrematureEofInsideUnknownValue.DOUBLE
-Required.ProtobufInput.PrematureEofInsideUnknownValue.ENUM
-Required.ProtobufInput.PrematureEofInsideUnknownValue.FIXED32
-Required.ProtobufInput.PrematureEofInsideUnknownValue.FIXED64
-Required.ProtobufInput.PrematureEofInsideUnknownValue.FLOAT
-Required.ProtobufInput.PrematureEofInsideUnknownValue.INT32
-Required.ProtobufInput.PrematureEofInsideUnknownValue.INT64
-Required.ProtobufInput.PrematureEofInsideUnknownValue.MESSAGE
-Required.ProtobufInput.PrematureEofInsideUnknownValue.SFIXED32
-Required.ProtobufInput.PrematureEofInsideUnknownValue.SFIXED64
-Required.ProtobufInput.PrematureEofInsideUnknownValue.SINT32
-Required.ProtobufInput.PrematureEofInsideUnknownValue.SINT64
-Required.ProtobufInput.PrematureEofInsideUnknownValue.STRING
-Required.ProtobufInput.PrematureEofInsideUnknownValue.UINT32
-Required.ProtobufInput.PrematureEofInsideUnknownValue.UINT64
-Required.ProtobufInput.RepeatedScalarSelectsLast.BOOL.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.BOOL.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.DOUBLE.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.DOUBLE.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED32.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED64.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED64.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FLOAT.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FLOAT.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.INT32.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.INT32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.INT64.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.INT64.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SFIXED32.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SFIXED32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SFIXED64.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SFIXED64.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SINT32.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SINT32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SINT64.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.SINT64.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.UINT32.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.UINT32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.UINT64.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.UINT64.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.BOOL.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.BOOL.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.DOUBLE.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.DOUBLE.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.FIXED32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.FIXED32.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.FIXED64.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.FIXED64.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.FLOAT.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.FLOAT.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.INT32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.INT32.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.INT64.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.INT64.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.SFIXED32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.SFIXED32.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.SFIXED64.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.SFIXED64.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.SINT32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.SINT32.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.SINT64.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.SINT64.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.UINT32.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.UINT32.ProtobufOutput
-Required.ProtobufInput.ValidDataRepeated.UINT64.JsonOutput
-Required.ProtobufInput.ValidDataRepeated.UINT64.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.BOOL.JsonOutput
-Required.ProtobufInput.ValidDataScalar.BOOL.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.DOUBLE.JsonOutput
-Required.ProtobufInput.ValidDataScalar.DOUBLE.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.FIXED32.JsonOutput
-Required.ProtobufInput.ValidDataScalar.FIXED32.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.FIXED64.JsonOutput
-Required.ProtobufInput.ValidDataScalar.FIXED64.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.FLOAT.JsonOutput
-Required.ProtobufInput.ValidDataScalar.FLOAT.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.INT32.JsonOutput
-Required.ProtobufInput.ValidDataScalar.INT32.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.INT64.JsonOutput
-Required.ProtobufInput.ValidDataScalar.INT64.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.SFIXED32.JsonOutput
-Required.ProtobufInput.ValidDataScalar.SFIXED32.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.SFIXED64.JsonOutput
-Required.ProtobufInput.ValidDataScalar.SFIXED64.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.SINT32.JsonOutput
-Required.ProtobufInput.ValidDataScalar.SINT32.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.SINT64.JsonOutput
-Required.ProtobufInput.ValidDataScalar.SINT64.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.UINT32.JsonOutput
-Required.ProtobufInput.ValidDataScalar.UINT32.ProtobufOutput
-Required.ProtobufInput.ValidDataScalar.UINT64.JsonOutput
-Required.ProtobufInput.ValidDataScalar.UINT64.ProtobufOutput
-Required.TimestampProtoInputTooLarge.JsonOutput
-Required.TimestampProtoInputTooSmall.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
+Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas6FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas9FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHasZeroFractionalDigit.Validator
+Recommended.Proto3.JsonInput.FieldMaskInvalidCharacter
+Required.Proto3.JsonInput.FloatFieldTooLarge
+Required.Proto3.JsonInput.FloatFieldTooSmall
+Required.Proto3.JsonInput.DoubleFieldTooSmall
+Required.Proto3.JsonInput.Int32FieldNotInteger
+Required.Proto3.JsonInput.Int64FieldNotInteger
+Required.Proto3.JsonInput.Uint32FieldNotInteger
+Required.Proto3.JsonInput.Uint64FieldNotInteger
+Required.Proto3.JsonInput.Int32FieldLeadingSpace
+Required.Proto3.JsonInput.OneofFieldDuplicate
+Required.Proto3.ProtobufInput.ValidDataRepeated.FLOAT.JsonOutput
diff --git a/conformance/failure_list_php_c.txt b/conformance/failure_list_php_c.txt
index 05cb218a..088708e9 100644
--- a/conformance/failure_list_php_c.txt
+++ b/conformance/failure_list_php_c.txt
@@ -1,235 +1,182 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
-Recommended.JsonInput.BoolFieldIntegerOne
-Recommended.JsonInput.BoolFieldIntegerZero
-Recommended.JsonInput.DurationHas3FractionalDigits.Validator
-Recommended.JsonInput.DurationHas6FractionalDigits.Validator
-Recommended.JsonInput.DurationHas9FractionalDigits.Validator
-Recommended.JsonInput.DurationHasZeroFractionalDigit.Validator
-Recommended.JsonInput.Int64FieldBeString.Validator
-Recommended.JsonInput.OneofZeroBool.JsonOutput
-Recommended.JsonInput.OneofZeroBool.ProtobufOutput
-Recommended.JsonInput.OneofZeroBytes.JsonOutput
-Recommended.JsonInput.OneofZeroBytes.ProtobufOutput
-Recommended.JsonInput.OneofZeroDouble.JsonOutput
-Recommended.JsonInput.OneofZeroDouble.ProtobufOutput
-Recommended.JsonInput.OneofZeroEnum.JsonOutput
-Recommended.JsonInput.OneofZeroEnum.ProtobufOutput
-Recommended.JsonInput.OneofZeroFloat.JsonOutput
-Recommended.JsonInput.OneofZeroFloat.ProtobufOutput
-Recommended.JsonInput.OneofZeroString.JsonOutput
-Recommended.JsonInput.OneofZeroString.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint32.JsonOutput
-Recommended.JsonInput.OneofZeroUint32.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint64.JsonOutput
-Recommended.JsonInput.OneofZeroUint64.ProtobufOutput
-Recommended.JsonInput.StringEndsWithEscapeChar
-Recommended.JsonInput.StringFieldSurrogateInWrongOrder
-Recommended.JsonInput.StringFieldUnpairedHighSurrogate
-Recommended.JsonInput.StringFieldUnpairedLowSurrogate
-Recommended.JsonInput.TimestampHas3FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas6FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas9FractionalDigits.Validator
-Recommended.JsonInput.TimestampHasZeroFractionalDigit.Validator
-Recommended.JsonInput.TimestampZeroNormalized.Validator
-Recommended.JsonInput.Uint64FieldBeString.Validator
-Recommended.ProtobufInput.OneofZeroBool.JsonOutput
-Recommended.ProtobufInput.OneofZeroBool.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroBytes.JsonOutput
-Recommended.ProtobufInput.OneofZeroBytes.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroDouble.JsonOutput
-Recommended.ProtobufInput.OneofZeroDouble.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroEnum.JsonOutput
-Recommended.ProtobufInput.OneofZeroEnum.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroFloat.JsonOutput
-Recommended.ProtobufInput.OneofZeroFloat.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroString.JsonOutput
-Recommended.ProtobufInput.OneofZeroString.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroUint32.JsonOutput
-Recommended.ProtobufInput.OneofZeroUint32.ProtobufOutput
-Recommended.ProtobufInput.OneofZeroUint64.JsonOutput
-Recommended.ProtobufInput.OneofZeroUint64.ProtobufOutput
+Recommended.Proto3.JsonInput.BoolFieldIntegerOne
+Recommended.Proto3.JsonInput.BoolFieldIntegerZero
+Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas6FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas9FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHasZeroFractionalDigit.Validator
+Recommended.Proto3.JsonInput.Int64FieldBeString.Validator
+Recommended.Proto3.JsonInput.MapFieldValueIsNull
+Recommended.Proto3.JsonInput.OneofZeroBytes.JsonOutput
+Recommended.Proto3.JsonInput.OneofZeroBytes.ProtobufOutput
+Recommended.Proto3.JsonInput.OneofZeroString.JsonOutput
+Recommended.Proto3.JsonInput.OneofZeroString.ProtobufOutput
+Recommended.Proto3.JsonInput.RepeatedFieldMessageElementIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldPrimitiveElementIsNull
+Recommended.Proto3.JsonInput.StringEndsWithEscapeChar
+Recommended.Proto3.JsonInput.StringFieldSurrogateInWrongOrder
+Recommended.Proto3.JsonInput.StringFieldUnpairedHighSurrogate
+Recommended.Proto3.JsonInput.StringFieldUnpairedLowSurrogate
+Recommended.Proto3.JsonInput.Uint64FieldBeString.Validator
+Recommended.Proto3.ProtobufInput.OneofZeroBytes.JsonOutput
+Recommended.Proto3.ProtobufInput.OneofZeroBytes.ProtobufOutput
+Recommended.Proto3.ProtobufInput.OneofZeroString.JsonOutput
+Recommended.Proto3.ProtobufInput.OneofZeroString.ProtobufOutput
 Required.DurationProtoInputTooLarge.JsonOutput
 Required.DurationProtoInputTooSmall.JsonOutput
-Required.JsonInput.AllFieldAcceptNull.ProtobufOutput
-Required.JsonInput.Any.JsonOutput
-Required.JsonInput.Any.ProtobufOutput
-Required.JsonInput.AnyNested.JsonOutput
-Required.JsonInput.AnyNested.ProtobufOutput
-Required.JsonInput.AnyUnorderedTypeTag.JsonOutput
-Required.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
-Required.JsonInput.AnyWithDuration.JsonOutput
-Required.JsonInput.AnyWithDuration.ProtobufOutput
-Required.JsonInput.AnyWithFieldMask.JsonOutput
-Required.JsonInput.AnyWithFieldMask.ProtobufOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
-Required.JsonInput.AnyWithStruct.JsonOutput
-Required.JsonInput.AnyWithStruct.ProtobufOutput
-Required.JsonInput.AnyWithTimestamp.JsonOutput
-Required.JsonInput.AnyWithTimestamp.ProtobufOutput
-Required.JsonInput.AnyWithValueForInteger.JsonOutput
-Required.JsonInput.AnyWithValueForInteger.ProtobufOutput
-Required.JsonInput.AnyWithValueForJsonObject.JsonOutput
-Required.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
-Required.JsonInput.BoolFieldFalse.ProtobufOutput
-Required.JsonInput.BoolMapField.JsonOutput
-Required.JsonInput.DoubleFieldInfinity.JsonOutput
-Required.JsonInput.DoubleFieldInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldNan.JsonOutput
-Required.JsonInput.DoubleFieldNan.ProtobufOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.JsonOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldQuotedValue.JsonOutput
-Required.JsonInput.DoubleFieldQuotedValue.ProtobufOutput
-Required.JsonInput.DurationMaxValue.JsonOutput
-Required.JsonInput.DurationMaxValue.ProtobufOutput
-Required.JsonInput.DurationMinValue.JsonOutput
-Required.JsonInput.DurationMinValue.ProtobufOutput
-Required.JsonInput.DurationRepeatedValue.JsonOutput
-Required.JsonInput.DurationRepeatedValue.ProtobufOutput
-Required.JsonInput.EnumField.ProtobufOutput
-Required.JsonInput.EnumFieldNumericValueNonZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
-Required.JsonInput.EnumFieldNumericValueZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueZero.ProtobufOutput
-Required.JsonInput.EnumFieldUnknownValue.Validator
-Required.JsonInput.FieldMask.JsonOutput
-Required.JsonInput.FieldMask.ProtobufOutput
-Required.JsonInput.FloatFieldInfinity.JsonOutput
-Required.JsonInput.FloatFieldInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldNan.JsonOutput
-Required.JsonInput.FloatFieldNan.ProtobufOutput
-Required.JsonInput.FloatFieldNegativeInfinity.JsonOutput
-Required.JsonInput.FloatFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldQuotedValue.JsonOutput
-Required.JsonInput.FloatFieldQuotedValue.ProtobufOutput
-Required.JsonInput.FloatFieldTooLarge
-Required.JsonInput.FloatFieldTooSmall
-Required.JsonInput.Int32FieldExponentialFormat.JsonOutput
-Required.JsonInput.Int32FieldExponentialFormat.ProtobufOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.JsonOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.ProtobufOutput
-Required.JsonInput.Int32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldMinFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMinFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldStringValue.JsonOutput
-Required.JsonInput.Int32FieldStringValue.ProtobufOutput
-Required.JsonInput.Int32FieldStringValueEscaped.JsonOutput
-Required.JsonInput.Int32FieldStringValueEscaped.ProtobufOutput
-Required.JsonInput.Int32MapEscapedKey.JsonOutput
-Required.JsonInput.Int32MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int32MapField.JsonOutput
-Required.JsonInput.Int32MapField.ProtobufOutput
-Required.JsonInput.Int64FieldMaxValue.JsonOutput
-Required.JsonInput.Int64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Int64FieldMinValue.JsonOutput
-Required.JsonInput.Int64FieldMinValue.ProtobufOutput
-Required.JsonInput.Int64MapEscapedKey.JsonOutput
-Required.JsonInput.Int64MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int64MapField.JsonOutput
-Required.JsonInput.Int64MapField.ProtobufOutput
-Required.JsonInput.MessageField.JsonOutput
-Required.JsonInput.MessageField.ProtobufOutput
-Required.JsonInput.MessageMapField.JsonOutput
-Required.JsonInput.MessageMapField.ProtobufOutput
-Required.JsonInput.MessageRepeatedField.JsonOutput
-Required.JsonInput.MessageRepeatedField.ProtobufOutput
-Required.JsonInput.OptionalBoolWrapper.JsonOutput
-Required.JsonInput.OptionalBoolWrapper.ProtobufOutput
-Required.JsonInput.OptionalBytesWrapper.JsonOutput
-Required.JsonInput.OptionalBytesWrapper.ProtobufOutput
-Required.JsonInput.OptionalDoubleWrapper.JsonOutput
-Required.JsonInput.OptionalDoubleWrapper.ProtobufOutput
-Required.JsonInput.OptionalFloatWrapper.JsonOutput
-Required.JsonInput.OptionalFloatWrapper.ProtobufOutput
-Required.JsonInput.OptionalInt32Wrapper.JsonOutput
-Required.JsonInput.OptionalInt32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalInt64Wrapper.JsonOutput
-Required.JsonInput.OptionalInt64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalStringWrapper.JsonOutput
-Required.JsonInput.OptionalStringWrapper.ProtobufOutput
-Required.JsonInput.OptionalUint32Wrapper.JsonOutput
-Required.JsonInput.OptionalUint32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalUint64Wrapper.JsonOutput
-Required.JsonInput.OptionalUint64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
-Required.JsonInput.PrimitiveRepeatedField.JsonOutput
-Required.JsonInput.PrimitiveRepeatedField.ProtobufOutput
-Required.JsonInput.RepeatedBoolWrapper.JsonOutput
-Required.JsonInput.RepeatedBoolWrapper.ProtobufOutput
-Required.JsonInput.RepeatedBytesWrapper.JsonOutput
-Required.JsonInput.RepeatedBytesWrapper.ProtobufOutput
-Required.JsonInput.RepeatedDoubleWrapper.JsonOutput
-Required.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
-Required.JsonInput.RepeatedFloatWrapper.JsonOutput
-Required.JsonInput.RepeatedFloatWrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt32Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt64Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedStringWrapper.JsonOutput
-Required.JsonInput.RepeatedStringWrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint32Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint64Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
-Required.JsonInput.StringFieldNotAString
-Required.JsonInput.StringFieldSurrogatePair.JsonOutput
-Required.JsonInput.StringFieldSurrogatePair.ProtobufOutput
-Required.JsonInput.Struct.JsonOutput
-Required.JsonInput.Struct.ProtobufOutput
-Required.JsonInput.TimestampMaxValue.JsonOutput
-Required.JsonInput.TimestampMaxValue.ProtobufOutput
-Required.JsonInput.TimestampMinValue.JsonOutput
-Required.JsonInput.TimestampMinValue.ProtobufOutput
-Required.JsonInput.TimestampRepeatedValue.JsonOutput
-Required.JsonInput.TimestampRepeatedValue.ProtobufOutput
-Required.JsonInput.TimestampWithNegativeOffset.JsonOutput
-Required.JsonInput.TimestampWithNegativeOffset.ProtobufOutput
-Required.JsonInput.TimestampWithPositiveOffset.JsonOutput
-Required.JsonInput.TimestampWithPositiveOffset.ProtobufOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Uint32MapField.JsonOutput
-Required.JsonInput.Uint32MapField.ProtobufOutput
-Required.JsonInput.Uint64FieldMaxValue.JsonOutput
-Required.JsonInput.Uint64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Uint64MapField.JsonOutput
-Required.JsonInput.Uint64MapField.ProtobufOutput
-Required.JsonInput.ValueAcceptBool.JsonOutput
-Required.JsonInput.ValueAcceptBool.ProtobufOutput
-Required.JsonInput.ValueAcceptFloat.JsonOutput
-Required.JsonInput.ValueAcceptFloat.ProtobufOutput
-Required.JsonInput.ValueAcceptInteger.JsonOutput
-Required.JsonInput.ValueAcceptInteger.ProtobufOutput
-Required.JsonInput.ValueAcceptList.JsonOutput
-Required.JsonInput.ValueAcceptList.ProtobufOutput
-Required.JsonInput.ValueAcceptNull.JsonOutput
-Required.JsonInput.ValueAcceptNull.ProtobufOutput
-Required.JsonInput.ValueAcceptObject.JsonOutput
-Required.JsonInput.ValueAcceptObject.ProtobufOutput
-Required.JsonInput.ValueAcceptString.JsonOutput
-Required.JsonInput.ValueAcceptString.ProtobufOutput
-Required.JsonInput.WrapperTypesWithNullValue.ProtobufOutput
-Required.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED32.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED64.ProtobufOutput
-Required.ProtobufInput.RepeatedScalarSelectsLast.UINT64.ProtobufOutput
+Required.Proto3.JsonInput.Any.JsonOutput
+Required.Proto3.JsonInput.Any.ProtobufOutput
+Required.Proto3.JsonInput.AnyNested.JsonOutput
+Required.Proto3.JsonInput.AnyNested.ProtobufOutput
+Required.Proto3.JsonInput.AnyUnorderedTypeTag.JsonOutput
+Required.Proto3.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithDuration.JsonOutput
+Required.Proto3.JsonInput.AnyWithDuration.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithFieldMask.JsonOutput
+Required.Proto3.JsonInput.AnyWithFieldMask.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
+Required.Proto3.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithStruct.JsonOutput
+Required.Proto3.JsonInput.AnyWithStruct.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithTimestamp.JsonOutput
+Required.Proto3.JsonInput.AnyWithTimestamp.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithValueForInteger.JsonOutput
+Required.Proto3.JsonInput.AnyWithValueForInteger.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithValueForJsonObject.JsonOutput
+Required.Proto3.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
+Required.Proto3.JsonInput.BoolMapField.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldInfinity.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldInfinity.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMaxPositiveValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMaxPositiveValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMinNegativeValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMinNegativeValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldNan.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldNan.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldNegativeInfinity.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldNegativeInfinity.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldQuotedValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldQuotedValue.ProtobufOutput
+Required.Proto3.JsonInput.DurationMaxValue.JsonOutput
+Required.Proto3.JsonInput.DurationMaxValue.ProtobufOutput
+Required.Proto3.JsonInput.DurationMinValue.JsonOutput
+Required.Proto3.JsonInput.DurationMinValue.ProtobufOutput
+Required.Proto3.JsonInput.DurationRepeatedValue.JsonOutput
+Required.Proto3.JsonInput.DurationRepeatedValue.ProtobufOutput
+Required.Proto3.JsonInput.EnumFieldNumericValueNonZero.JsonOutput
+Required.Proto3.JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
+Required.Proto3.JsonInput.EnumFieldNumericValueZero.JsonOutput
+Required.Proto3.JsonInput.EnumFieldNumericValueZero.ProtobufOutput
+Required.Proto3.JsonInput.EnumFieldUnknownValue.Validator
+Required.Proto3.JsonInput.FieldMask.JsonOutput
+Required.Proto3.JsonInput.FieldMask.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldInfinity.JsonOutput
+Required.Proto3.JsonInput.FloatFieldInfinity.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldNan.JsonOutput
+Required.Proto3.JsonInput.FloatFieldNan.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldNegativeInfinity.JsonOutput
+Required.Proto3.JsonInput.FloatFieldNegativeInfinity.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldQuotedValue.JsonOutput
+Required.Proto3.JsonInput.FloatFieldQuotedValue.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldTooLarge
+Required.Proto3.JsonInput.FloatFieldTooSmall
+Required.Proto3.JsonInput.Int32FieldExponentialFormat.JsonOutput
+Required.Proto3.JsonInput.Int32FieldExponentialFormat.ProtobufOutput
+Required.Proto3.JsonInput.Int32FieldFloatTrailingZero.JsonOutput
+Required.Proto3.JsonInput.Int32FieldFloatTrailingZero.ProtobufOutput
+Required.Proto3.JsonInput.Int32FieldMaxFloatValue.JsonOutput
+Required.Proto3.JsonInput.Int32FieldMaxFloatValue.ProtobufOutput
+Required.Proto3.JsonInput.Int32FieldMinFloatValue.JsonOutput
+Required.Proto3.JsonInput.Int32FieldMinFloatValue.ProtobufOutput
+Required.Proto3.JsonInput.Int32FieldStringValue.JsonOutput
+Required.Proto3.JsonInput.Int32FieldStringValue.ProtobufOutput
+Required.Proto3.JsonInput.Int32FieldStringValueEscaped.JsonOutput
+Required.Proto3.JsonInput.Int32FieldStringValueEscaped.ProtobufOutput
+Required.Proto3.JsonInput.Int64FieldMaxValue.JsonOutput
+Required.Proto3.JsonInput.Int64FieldMaxValue.ProtobufOutput
+Required.Proto3.JsonInput.Int64FieldMinValue.JsonOutput
+Required.Proto3.JsonInput.Int64FieldMinValue.ProtobufOutput
+Required.Proto3.JsonInput.MessageField.JsonOutput
+Required.Proto3.JsonInput.MessageField.ProtobufOutput
+Required.Proto3.JsonInput.OptionalBoolWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalBoolWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalBytesWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalBytesWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalDoubleWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalDoubleWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalFloatWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalFloatWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalInt32Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalInt32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalInt64Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalInt64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalStringWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalStringWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalUint32Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalUint32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalUint64Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalUint64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
+Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedBoolWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedBoolWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedBytesWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedBytesWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedDoubleWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingMessagesGotInt
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
+Required.Proto3.JsonInput.RepeatedFloatWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedFloatWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedInt32Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedInt64Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedStringWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedStringWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedUint32Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedUint64Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.StringFieldEscape.JsonOutput
+Required.Proto3.JsonInput.StringFieldEscape.ProtobufOutput
+Required.Proto3.JsonInput.StringFieldNotAString
+Required.Proto3.JsonInput.StringFieldSurrogatePair.JsonOutput
+Required.Proto3.JsonInput.StringFieldSurrogatePair.ProtobufOutput
+Required.Proto3.JsonInput.StringFieldUnicodeEscape.JsonOutput
+Required.Proto3.JsonInput.StringFieldUnicodeEscape.ProtobufOutput
+Required.Proto3.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.JsonOutput
+Required.Proto3.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.ProtobufOutput
+Required.Proto3.JsonInput.Struct.JsonOutput
+Required.Proto3.JsonInput.Struct.ProtobufOutput
+Required.Proto3.JsonInput.Uint32FieldMaxFloatValue.JsonOutput
+Required.Proto3.JsonInput.Uint32FieldMaxFloatValue.ProtobufOutput
+Required.Proto3.JsonInput.Uint64FieldMaxValue.JsonOutput
+Required.Proto3.JsonInput.Uint64FieldMaxValue.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptBool.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptBool.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptFloat.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptFloat.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptInteger.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptInteger.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptList.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptList.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptNull.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptNull.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptObject.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptObject.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptString.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptString.ProtobufOutput
+Required.Proto3.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
+Required.Proto3.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
+Required.Proto3.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
+Required.Proto3.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.FLOAT.JsonOutput
 Required.TimestampProtoInputTooLarge.JsonOutput
 Required.TimestampProtoInputTooSmall.JsonOutput
diff --git a/conformance/failure_list_php_zts_c.txt b/conformance/failure_list_php_zts_c.txt
new file mode 100644
index 00000000..d9a8fe36
--- /dev/null
+++ b/conformance/failure_list_php_zts_c.txt
@@ -0,0 +1,225 @@
+Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
+Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
+Recommended.FieldMaskTooManyUnderscore.JsonOutput
+Recommended.JsonInput.BoolFieldIntegerOne
+Recommended.JsonInput.BoolFieldIntegerZero
+Recommended.JsonInput.DurationHas3FractionalDigits.Validator
+Recommended.JsonInput.DurationHas6FractionalDigits.Validator
+Recommended.JsonInput.DurationHas9FractionalDigits.Validator
+Recommended.JsonInput.DurationHasZeroFractionalDigit.Validator
+Recommended.JsonInput.Int64FieldBeString.Validator
+Recommended.JsonInput.OneofZeroBytes.JsonOutput
+Recommended.JsonInput.OneofZeroBytes.ProtobufOutput
+Recommended.JsonInput.OneofZeroDouble.JsonOutput
+Recommended.JsonInput.OneofZeroDouble.ProtobufOutput
+Recommended.JsonInput.OneofZeroFloat.JsonOutput
+Recommended.JsonInput.OneofZeroFloat.ProtobufOutput
+Recommended.JsonInput.OneofZeroString.JsonOutput
+Recommended.JsonInput.OneofZeroString.ProtobufOutput
+Recommended.JsonInput.OneofZeroUint32.JsonOutput
+Recommended.JsonInput.OneofZeroUint32.ProtobufOutput
+Recommended.JsonInput.OneofZeroUint64.JsonOutput
+Recommended.JsonInput.OneofZeroUint64.ProtobufOutput
+Recommended.JsonInput.StringEndsWithEscapeChar
+Recommended.JsonInput.StringFieldSurrogateInWrongOrder
+Recommended.JsonInput.StringFieldUnpairedHighSurrogate
+Recommended.JsonInput.StringFieldUnpairedLowSurrogate
+Recommended.JsonInput.TimestampHas3FractionalDigits.Validator
+Recommended.JsonInput.TimestampHas6FractionalDigits.Validator
+Recommended.JsonInput.TimestampHas9FractionalDigits.Validator
+Recommended.JsonInput.TimestampHasZeroFractionalDigit.Validator
+Recommended.JsonInput.TimestampZeroNormalized.Validator
+Recommended.JsonInput.Uint64FieldBeString.Validator
+Recommended.ProtobufInput.OneofZeroBytes.JsonOutput
+Recommended.ProtobufInput.OneofZeroBytes.ProtobufOutput
+Recommended.ProtobufInput.OneofZeroString.JsonOutput
+Recommended.ProtobufInput.OneofZeroString.ProtobufOutput
+Required.DurationProtoInputTooLarge.JsonOutput
+Required.DurationProtoInputTooSmall.JsonOutput
+Required.JsonInput.AllFieldAcceptNull.ProtobufOutput
+Required.JsonInput.Any.JsonOutput
+Required.JsonInput.Any.ProtobufOutput
+Required.JsonInput.AnyNested.JsonOutput
+Required.JsonInput.AnyNested.ProtobufOutput
+Required.JsonInput.AnyUnorderedTypeTag.JsonOutput
+Required.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
+Required.JsonInput.AnyWithDuration.JsonOutput
+Required.JsonInput.AnyWithDuration.ProtobufOutput
+Required.JsonInput.AnyWithFieldMask.JsonOutput
+Required.JsonInput.AnyWithFieldMask.ProtobufOutput
+Required.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
+Required.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
+Required.JsonInput.AnyWithStruct.JsonOutput
+Required.JsonInput.AnyWithStruct.ProtobufOutput
+Required.JsonInput.AnyWithTimestamp.JsonOutput
+Required.JsonInput.AnyWithTimestamp.ProtobufOutput
+Required.JsonInput.AnyWithValueForInteger.JsonOutput
+Required.JsonInput.AnyWithValueForInteger.ProtobufOutput
+Required.JsonInput.AnyWithValueForJsonObject.JsonOutput
+Required.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
+Required.JsonInput.BoolFieldFalse.ProtobufOutput
+Required.JsonInput.BoolMapField.JsonOutput
+Required.JsonInput.DoubleFieldInfinity.JsonOutput
+Required.JsonInput.DoubleFieldInfinity.ProtobufOutput
+Required.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
+Required.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
+Required.JsonInput.DoubleFieldMaxPositiveValue.JsonOutput
+Required.JsonInput.DoubleFieldMaxPositiveValue.ProtobufOutput
+Required.JsonInput.DoubleFieldMinNegativeValue.JsonOutput
+Required.JsonInput.DoubleFieldMinNegativeValue.ProtobufOutput
+Required.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
+Required.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
+Required.JsonInput.DoubleFieldNan.JsonOutput
+Required.JsonInput.DoubleFieldNan.ProtobufOutput
+Required.JsonInput.DoubleFieldNegativeInfinity.JsonOutput
+Required.JsonInput.DoubleFieldNegativeInfinity.ProtobufOutput
+Required.JsonInput.DoubleFieldQuotedValue.JsonOutput
+Required.JsonInput.DoubleFieldQuotedValue.ProtobufOutput
+Required.JsonInput.DurationMaxValue.JsonOutput
+Required.JsonInput.DurationMaxValue.ProtobufOutput
+Required.JsonInput.DurationMinValue.JsonOutput
+Required.JsonInput.DurationMinValue.ProtobufOutput
+Required.JsonInput.DurationRepeatedValue.JsonOutput
+Required.JsonInput.DurationRepeatedValue.ProtobufOutput
+Required.JsonInput.EnumField.ProtobufOutput
+Required.JsonInput.EnumFieldNumericValueNonZero.JsonOutput
+Required.JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
+Required.JsonInput.EnumFieldNumericValueZero.JsonOutput
+Required.JsonInput.EnumFieldNumericValueZero.ProtobufOutput
+Required.JsonInput.EnumFieldUnknownValue.Validator
+Required.JsonInput.FieldMask.JsonOutput
+Required.JsonInput.FieldMask.ProtobufOutput
+Required.JsonInput.FloatFieldInfinity.JsonOutput
+Required.JsonInput.FloatFieldInfinity.ProtobufOutput
+Required.JsonInput.FloatFieldNan.JsonOutput
+Required.JsonInput.FloatFieldNan.ProtobufOutput
+Required.JsonInput.FloatFieldNegativeInfinity.JsonOutput
+Required.JsonInput.FloatFieldNegativeInfinity.ProtobufOutput
+Required.JsonInput.FloatFieldQuotedValue.JsonOutput
+Required.JsonInput.FloatFieldQuotedValue.ProtobufOutput
+Required.JsonInput.FloatFieldTooLarge
+Required.JsonInput.FloatFieldTooSmall
+Required.JsonInput.Int32FieldExponentialFormat.JsonOutput
+Required.JsonInput.Int32FieldExponentialFormat.ProtobufOutput
+Required.JsonInput.Int32FieldFloatTrailingZero.JsonOutput
+Required.JsonInput.Int32FieldFloatTrailingZero.ProtobufOutput
+Required.JsonInput.Int32FieldMaxFloatValue.JsonOutput
+Required.JsonInput.Int32FieldMaxFloatValue.ProtobufOutput
+Required.JsonInput.Int32FieldMinFloatValue.JsonOutput
+Required.JsonInput.Int32FieldMinFloatValue.ProtobufOutput
+Required.JsonInput.Int32FieldStringValue.JsonOutput
+Required.JsonInput.Int32FieldStringValue.ProtobufOutput
+Required.JsonInput.Int32FieldStringValueEscaped.JsonOutput
+Required.JsonInput.Int32FieldStringValueEscaped.ProtobufOutput
+Required.JsonInput.Int32MapEscapedKey.JsonOutput
+Required.JsonInput.Int32MapEscapedKey.ProtobufOutput
+Required.JsonInput.Int32MapField.JsonOutput
+Required.JsonInput.Int32MapField.ProtobufOutput
+Required.JsonInput.Int64FieldMaxValue.JsonOutput
+Required.JsonInput.Int64FieldMaxValue.ProtobufOutput
+Required.JsonInput.Int64FieldMinValue.JsonOutput
+Required.JsonInput.Int64FieldMinValue.ProtobufOutput
+Required.JsonInput.Int64MapEscapedKey.JsonOutput
+Required.JsonInput.Int64MapEscapedKey.ProtobufOutput
+Required.JsonInput.Int64MapField.JsonOutput
+Required.JsonInput.Int64MapField.ProtobufOutput
+Required.JsonInput.MessageField.JsonOutput
+Required.JsonInput.MessageField.ProtobufOutput
+Required.JsonInput.MessageMapField.JsonOutput
+Required.JsonInput.MessageMapField.ProtobufOutput
+Required.JsonInput.MessageRepeatedField.JsonOutput
+Required.JsonInput.MessageRepeatedField.ProtobufOutput
+Required.JsonInput.OptionalBoolWrapper.JsonOutput
+Required.JsonInput.OptionalBoolWrapper.ProtobufOutput
+Required.JsonInput.OptionalBytesWrapper.JsonOutput
+Required.JsonInput.OptionalBytesWrapper.ProtobufOutput
+Required.JsonInput.OptionalDoubleWrapper.JsonOutput
+Required.JsonInput.OptionalDoubleWrapper.ProtobufOutput
+Required.JsonInput.OptionalFloatWrapper.JsonOutput
+Required.JsonInput.OptionalFloatWrapper.ProtobufOutput
+Required.JsonInput.OptionalInt32Wrapper.JsonOutput
+Required.JsonInput.OptionalInt32Wrapper.ProtobufOutput
+Required.JsonInput.OptionalInt64Wrapper.JsonOutput
+Required.JsonInput.OptionalInt64Wrapper.ProtobufOutput
+Required.JsonInput.OptionalStringWrapper.JsonOutput
+Required.JsonInput.OptionalStringWrapper.ProtobufOutput
+Required.JsonInput.OptionalUint32Wrapper.JsonOutput
+Required.JsonInput.OptionalUint32Wrapper.ProtobufOutput
+Required.JsonInput.OptionalUint64Wrapper.JsonOutput
+Required.JsonInput.OptionalUint64Wrapper.ProtobufOutput
+Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
+Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
+Required.JsonInput.PrimitiveRepeatedField.JsonOutput
+Required.JsonInput.PrimitiveRepeatedField.ProtobufOutput
+Required.JsonInput.RepeatedBoolWrapper.JsonOutput
+Required.JsonInput.RepeatedBoolWrapper.ProtobufOutput
+Required.JsonInput.RepeatedBytesWrapper.JsonOutput
+Required.JsonInput.RepeatedBytesWrapper.ProtobufOutput
+Required.JsonInput.RepeatedDoubleWrapper.JsonOutput
+Required.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
+Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
+Required.JsonInput.RepeatedFloatWrapper.JsonOutput
+Required.JsonInput.RepeatedFloatWrapper.ProtobufOutput
+Required.JsonInput.RepeatedInt32Wrapper.JsonOutput
+Required.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
+Required.JsonInput.RepeatedInt64Wrapper.JsonOutput
+Required.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
+Required.JsonInput.RepeatedStringWrapper.JsonOutput
+Required.JsonInput.RepeatedStringWrapper.ProtobufOutput
+Required.JsonInput.RepeatedUint32Wrapper.JsonOutput
+Required.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
+Required.JsonInput.RepeatedUint64Wrapper.JsonOutput
+Required.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
+Required.JsonInput.StringFieldEscape.JsonOutput
+Required.JsonInput.StringFieldEscape.ProtobufOutput
+Required.JsonInput.StringFieldNotAString
+Required.JsonInput.StringFieldSurrogatePair.JsonOutput
+Required.JsonInput.StringFieldSurrogatePair.ProtobufOutput
+Required.JsonInput.StringFieldUnicodeEscape.JsonOutput
+Required.JsonInput.StringFieldUnicodeEscape.ProtobufOutput
+Required.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.JsonOutput
+Required.JsonInput.StringFieldUnicodeEscapeWithLowercaseHexLetters.ProtobufOutput
+Required.JsonInput.Struct.JsonOutput
+Required.JsonInput.Struct.ProtobufOutput
+Required.JsonInput.TimestampMaxValue.JsonOutput
+Required.JsonInput.TimestampMaxValue.ProtobufOutput
+Required.JsonInput.TimestampMinValue.JsonOutput
+Required.JsonInput.TimestampMinValue.ProtobufOutput
+Required.JsonInput.TimestampRepeatedValue.JsonOutput
+Required.JsonInput.TimestampRepeatedValue.ProtobufOutput
+Required.JsonInput.TimestampWithNegativeOffset.JsonOutput
+Required.JsonInput.TimestampWithNegativeOffset.ProtobufOutput
+Required.JsonInput.TimestampWithPositiveOffset.JsonOutput
+Required.JsonInput.TimestampWithPositiveOffset.ProtobufOutput
+Required.JsonInput.Uint32FieldMaxFloatValue.JsonOutput
+Required.JsonInput.Uint32FieldMaxFloatValue.ProtobufOutput
+Required.JsonInput.Uint32MapField.JsonOutput
+Required.JsonInput.Uint32MapField.ProtobufOutput
+Required.JsonInput.Uint64FieldMaxValue.JsonOutput
+Required.JsonInput.Uint64FieldMaxValue.ProtobufOutput
+Required.JsonInput.Uint64MapField.JsonOutput
+Required.JsonInput.Uint64MapField.ProtobufOutput
+Required.JsonInput.ValueAcceptBool.JsonOutput
+Required.JsonInput.ValueAcceptBool.ProtobufOutput
+Required.JsonInput.ValueAcceptFloat.JsonOutput
+Required.JsonInput.ValueAcceptFloat.ProtobufOutput
+Required.JsonInput.ValueAcceptInteger.JsonOutput
+Required.JsonInput.ValueAcceptInteger.ProtobufOutput
+Required.JsonInput.ValueAcceptList.JsonOutput
+Required.JsonInput.ValueAcceptList.ProtobufOutput
+Required.JsonInput.ValueAcceptNull.JsonOutput
+Required.JsonInput.ValueAcceptNull.ProtobufOutput
+Required.JsonInput.ValueAcceptObject.JsonOutput
+Required.JsonInput.ValueAcceptObject.ProtobufOutput
+Required.JsonInput.ValueAcceptString.JsonOutput
+Required.JsonInput.ValueAcceptString.ProtobufOutput
+Required.JsonInput.WrapperTypesWithNullValue.ProtobufOutput
+Required.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
+Required.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
+Required.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
+Required.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
+Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED32.ProtobufOutput
+Required.ProtobufInput.RepeatedScalarSelectsLast.FIXED64.ProtobufOutput
+Required.ProtobufInput.RepeatedScalarSelectsLast.UINT64.ProtobufOutput
+Required.TimestampProtoInputTooLarge.JsonOutput
+Required.TimestampProtoInputTooSmall.JsonOutput
diff --git a/conformance/failure_list_python.txt b/conformance/failure_list_python.txt
index 9d556a03..e3ce7af7 100644
--- a/conformance/failure_list_python.txt
+++ b/conformance/failure_list_python.txt
@@ -1,13 +1,21 @@
-Recommended.JsonInput.DoubleFieldInfinityNotQuoted
-Recommended.JsonInput.DoubleFieldNanNotQuoted
-Recommended.JsonInput.DoubleFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.FloatFieldInfinityNotQuoted
-Recommended.JsonInput.FloatFieldNanNotQuoted
-Recommended.JsonInput.FloatFieldNegativeInfinityNotQuoted
-Required.JsonInput.BytesFieldInvalidBase64Characters
-Required.JsonInput.DoubleFieldTooSmall
-Required.JsonInput.EnumFieldUnknownValue.Validator
-Required.JsonInput.FloatFieldTooLarge
-Required.JsonInput.FloatFieldTooSmall
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotBool
-Required.JsonInput.TimestampJsonInputLowercaseT
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
+Recommended.Proto3.JsonInput.DoubleFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNanNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNegativeInfinityNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNanNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNegativeInfinityNotQuoted
+Required.Proto3.JsonInput.DoubleFieldTooSmall
+Required.Proto3.JsonInput.FloatFieldTooLarge
+Required.Proto3.JsonInput.FloatFieldTooSmall
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotBool
+Required.Proto3.JsonInput.TimestampJsonInputLowercaseT
+Required.Proto2.ProtobufInput.IllegalZeroFieldNum_Case_0
+Required.Proto2.ProtobufInput.IllegalZeroFieldNum_Case_1
+Required.Proto2.ProtobufInput.IllegalZeroFieldNum_Case_2
+Required.Proto2.ProtobufInput.IllegalZeroFieldNum_Case_3
+Required.Proto3.ProtobufInput.IllegalZeroFieldNum_Case_0
+Required.Proto3.ProtobufInput.IllegalZeroFieldNum_Case_1
+Required.Proto3.ProtobufInput.IllegalZeroFieldNum_Case_2
+Required.Proto3.ProtobufInput.IllegalZeroFieldNum_Case_3
diff --git a/conformance/failure_list_python_cpp.txt b/conformance/failure_list_python_cpp.txt
index 92404d2f..a498ad1a 100644
--- a/conformance/failure_list_python_cpp.txt
+++ b/conformance/failure_list_python_cpp.txt
@@ -7,32 +7,48 @@
 # TODO(haberman): insert links to corresponding bugs tracking the issue.
 # Should we use GitHub issues or the Google-internal bug tracker?
 
-Recommended.JsonInput.DoubleFieldInfinityNotQuoted
-Recommended.JsonInput.DoubleFieldNanNotQuoted
-Recommended.JsonInput.DoubleFieldNegativeInfinityNotQuoted
-Recommended.JsonInput.FloatFieldInfinityNotQuoted
-Recommended.JsonInput.FloatFieldNanNotQuoted
-Recommended.JsonInput.FloatFieldNegativeInfinityNotQuoted
-Required.JsonInput.BytesFieldInvalidBase64Characters
-Required.JsonInput.DoubleFieldTooSmall
-Required.JsonInput.EnumFieldUnknownValue.Validator
-Required.JsonInput.FloatFieldTooLarge
-Required.JsonInput.FloatFieldTooSmall
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotBool
-Required.JsonInput.TimestampJsonInputLowercaseT
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
-Required.ProtobufInput.PrematureEofInPackedField.BOOL
-Required.ProtobufInput.PrematureEofInPackedField.DOUBLE
-Required.ProtobufInput.PrematureEofInPackedField.ENUM
-Required.ProtobufInput.PrematureEofInPackedField.FIXED32
-Required.ProtobufInput.PrematureEofInPackedField.FIXED64
-Required.ProtobufInput.PrematureEofInPackedField.FLOAT
-Required.ProtobufInput.PrematureEofInPackedField.INT32
-Required.ProtobufInput.PrematureEofInPackedField.INT64
-Required.ProtobufInput.PrematureEofInPackedField.SFIXED32
-Required.ProtobufInput.PrematureEofInPackedField.SFIXED64
-Required.ProtobufInput.PrematureEofInPackedField.SINT32
-Required.ProtobufInput.PrematureEofInPackedField.SINT64
-Required.ProtobufInput.PrematureEofInPackedField.UINT32
-Required.ProtobufInput.PrematureEofInPackedField.UINT64
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
+Recommended.Proto3.JsonInput.DoubleFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNanNotQuoted
+Recommended.Proto3.JsonInput.DoubleFieldNegativeInfinityNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldInfinityNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNanNotQuoted
+Recommended.Proto3.JsonInput.FloatFieldNegativeInfinityNotQuoted
+Required.Proto3.JsonInput.DoubleFieldTooSmall
+Required.Proto3.JsonInput.FloatFieldTooLarge
+Required.Proto3.JsonInput.FloatFieldTooSmall
+Required.Proto3.JsonInput.RepeatedFieldWrongElementTypeExpectingIntegersGotBool
+Required.Proto3.JsonInput.TimestampJsonInputLowercaseT
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto3.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.BOOL
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.DOUBLE
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.ENUM
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.FIXED32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.FIXED64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.FLOAT
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.INT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.INT64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SFIXED32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SFIXED64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SINT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.SINT64
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.UINT32
+Required.Proto3.ProtobufInput.PrematureEofInPackedField.UINT64
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownNonRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInDelimitedDataForKnownRepeatedValue.MESSAGE
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.BOOL
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.DOUBLE
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.ENUM
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.FIXED32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.FIXED64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.FLOAT
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.INT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.INT64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SFIXED32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SFIXED64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SINT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.SINT64
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.UINT32
+Required.Proto2.ProtobufInput.PrematureEofInPackedField.UINT64
diff --git a/conformance/failure_list_ruby.txt b/conformance/failure_list_ruby.txt
index 1de6c439..b2683372 100644
--- a/conformance/failure_list_ruby.txt
+++ b/conformance/failure_list_ruby.txt
@@ -1,203 +1,137 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
-Recommended.JsonInput.BoolFieldIntegerOne
-Recommended.JsonInput.BoolFieldIntegerZero
-Recommended.JsonInput.DurationHas3FractionalDigits.Validator
-Recommended.JsonInput.DurationHas6FractionalDigits.Validator
-Recommended.JsonInput.DurationHas9FractionalDigits.Validator
-Recommended.JsonInput.DurationHasZeroFractionalDigit.Validator
-Recommended.JsonInput.Int64FieldBeString.Validator
-Recommended.JsonInput.OneofZeroDouble.JsonOutput
-Recommended.JsonInput.OneofZeroDouble.ProtobufOutput
-Recommended.JsonInput.OneofZeroFloat.JsonOutput
-Recommended.JsonInput.OneofZeroFloat.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint32.JsonOutput
-Recommended.JsonInput.OneofZeroUint32.ProtobufOutput
-Recommended.JsonInput.OneofZeroUint64.JsonOutput
-Recommended.JsonInput.OneofZeroUint64.ProtobufOutput
-Recommended.JsonInput.StringEndsWithEscapeChar
-Recommended.JsonInput.StringFieldSurrogateInWrongOrder
-Recommended.JsonInput.StringFieldUnpairedHighSurrogate
-Recommended.JsonInput.StringFieldUnpairedLowSurrogate
-Recommended.JsonInput.TimestampHas3FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas6FractionalDigits.Validator
-Recommended.JsonInput.TimestampHas9FractionalDigits.Validator
-Recommended.JsonInput.TimestampHasZeroFractionalDigit.Validator
-Recommended.JsonInput.TimestampZeroNormalized.Validator
-Recommended.JsonInput.Uint64FieldBeString.Validator
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
+Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
+Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas6FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHas9FractionalDigits.Validator
+Recommended.Proto3.JsonInput.DurationHasZeroFractionalDigit.Validator
+Recommended.Proto3.JsonInput.Int64FieldBeString.Validator
+Recommended.Proto3.JsonInput.MapFieldValueIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldMessageElementIsNull
+Recommended.Proto3.JsonInput.RepeatedFieldPrimitiveElementIsNull
+Recommended.Proto3.JsonInput.StringEndsWithEscapeChar
+Recommended.Proto3.JsonInput.StringFieldSurrogateInWrongOrder
+Recommended.Proto3.JsonInput.StringFieldUnpairedHighSurrogate
+Recommended.Proto3.JsonInput.StringFieldUnpairedLowSurrogate
+Recommended.Proto3.JsonInput.TimestampHas3FractionalDigits.Validator
+Recommended.Proto3.JsonInput.TimestampHas6FractionalDigits.Validator
+Recommended.Proto3.JsonInput.TimestampHas9FractionalDigits.Validator
+Recommended.Proto3.JsonInput.TimestampHasZeroFractionalDigit.Validator
+Recommended.Proto3.JsonInput.TimestampZeroNormalized.Validator
+Recommended.Proto3.JsonInput.Uint64FieldBeString.Validator
 Required.DurationProtoInputTooLarge.JsonOutput
 Required.DurationProtoInputTooSmall.JsonOutput
-Required.JsonInput.Any.JsonOutput
-Required.JsonInput.Any.ProtobufOutput
-Required.JsonInput.AnyNested.JsonOutput
-Required.JsonInput.AnyNested.ProtobufOutput
-Required.JsonInput.AnyUnorderedTypeTag.JsonOutput
-Required.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
-Required.JsonInput.AnyWithDuration.JsonOutput
-Required.JsonInput.AnyWithDuration.ProtobufOutput
-Required.JsonInput.AnyWithFieldMask.JsonOutput
-Required.JsonInput.AnyWithFieldMask.ProtobufOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
-Required.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
-Required.JsonInput.AnyWithStruct.JsonOutput
-Required.JsonInput.AnyWithStruct.ProtobufOutput
-Required.JsonInput.AnyWithTimestamp.JsonOutput
-Required.JsonInput.AnyWithTimestamp.ProtobufOutput
-Required.JsonInput.AnyWithValueForInteger.JsonOutput
-Required.JsonInput.AnyWithValueForInteger.ProtobufOutput
-Required.JsonInput.AnyWithValueForJsonObject.JsonOutput
-Required.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
-Required.JsonInput.DoubleFieldInfinity.JsonOutput
-Required.JsonInput.DoubleFieldInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMaxPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.JsonOutput
-Required.JsonInput.DoubleFieldMinNegativeValue.ProtobufOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
-Required.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
-Required.JsonInput.DoubleFieldNan.JsonOutput
-Required.JsonInput.DoubleFieldNan.ProtobufOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.JsonOutput
-Required.JsonInput.DoubleFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.DoubleFieldQuotedValue.JsonOutput
-Required.JsonInput.DoubleFieldQuotedValue.ProtobufOutput
-Required.JsonInput.DurationMaxValue.JsonOutput
-Required.JsonInput.DurationMaxValue.ProtobufOutput
-Required.JsonInput.DurationMinValue.JsonOutput
-Required.JsonInput.DurationMinValue.ProtobufOutput
-Required.JsonInput.DurationRepeatedValue.JsonOutput
-Required.JsonInput.DurationRepeatedValue.ProtobufOutput
-Required.JsonInput.EnumFieldNumericValueNonZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
-Required.JsonInput.EnumFieldNumericValueZero.JsonOutput
-Required.JsonInput.EnumFieldNumericValueZero.ProtobufOutput
-Required.JsonInput.EnumFieldUnknownValue.Validator
-Required.JsonInput.FieldMask.JsonOutput
-Required.JsonInput.FieldMask.ProtobufOutput
-Required.JsonInput.FloatFieldInfinity.JsonOutput
-Required.JsonInput.FloatFieldInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldNan.JsonOutput
-Required.JsonInput.FloatFieldNan.ProtobufOutput
-Required.JsonInput.FloatFieldNegativeInfinity.JsonOutput
-Required.JsonInput.FloatFieldNegativeInfinity.ProtobufOutput
-Required.JsonInput.FloatFieldQuotedValue.JsonOutput
-Required.JsonInput.FloatFieldQuotedValue.ProtobufOutput
-Required.JsonInput.FloatFieldTooLarge
-Required.JsonInput.FloatFieldTooSmall
-Required.JsonInput.Int32FieldExponentialFormat.JsonOutput
-Required.JsonInput.Int32FieldExponentialFormat.ProtobufOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.JsonOutput
-Required.JsonInput.Int32FieldFloatTrailingZero.ProtobufOutput
-Required.JsonInput.Int32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldMinFloatValue.JsonOutput
-Required.JsonInput.Int32FieldMinFloatValue.ProtobufOutput
-Required.JsonInput.Int32FieldStringValue.JsonOutput
-Required.JsonInput.Int32FieldStringValue.ProtobufOutput
-Required.JsonInput.Int32FieldStringValueEscaped.JsonOutput
-Required.JsonInput.Int32FieldStringValueEscaped.ProtobufOutput
-Required.JsonInput.Int32MapEscapedKey.JsonOutput
-Required.JsonInput.Int32MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int32MapField.JsonOutput
-Required.JsonInput.Int32MapField.ProtobufOutput
-Required.JsonInput.Int64FieldMaxValue.JsonOutput
-Required.JsonInput.Int64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Int64FieldMinValue.JsonOutput
-Required.JsonInput.Int64FieldMinValue.ProtobufOutput
-Required.JsonInput.Int64MapEscapedKey.JsonOutput
-Required.JsonInput.Int64MapEscapedKey.ProtobufOutput
-Required.JsonInput.Int64MapField.JsonOutput
-Required.JsonInput.Int64MapField.ProtobufOutput
-Required.JsonInput.MessageField.JsonOutput
-Required.JsonInput.MessageField.ProtobufOutput
-Required.JsonInput.MessageMapField.JsonOutput
-Required.JsonInput.MessageMapField.ProtobufOutput
-Required.JsonInput.MessageRepeatedField.JsonOutput
-Required.JsonInput.MessageRepeatedField.ProtobufOutput
-Required.JsonInput.OptionalBoolWrapper.JsonOutput
-Required.JsonInput.OptionalBoolWrapper.ProtobufOutput
-Required.JsonInput.OptionalBytesWrapper.JsonOutput
-Required.JsonInput.OptionalBytesWrapper.ProtobufOutput
-Required.JsonInput.OptionalDoubleWrapper.JsonOutput
-Required.JsonInput.OptionalDoubleWrapper.ProtobufOutput
-Required.JsonInput.OptionalFloatWrapper.JsonOutput
-Required.JsonInput.OptionalFloatWrapper.ProtobufOutput
-Required.JsonInput.OptionalInt32Wrapper.JsonOutput
-Required.JsonInput.OptionalInt32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalInt64Wrapper.JsonOutput
-Required.JsonInput.OptionalInt64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalStringWrapper.JsonOutput
-Required.JsonInput.OptionalStringWrapper.ProtobufOutput
-Required.JsonInput.OptionalUint32Wrapper.JsonOutput
-Required.JsonInput.OptionalUint32Wrapper.ProtobufOutput
-Required.JsonInput.OptionalUint64Wrapper.JsonOutput
-Required.JsonInput.OptionalUint64Wrapper.ProtobufOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
-Required.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
-Required.JsonInput.PrimitiveRepeatedField.JsonOutput
-Required.JsonInput.PrimitiveRepeatedField.ProtobufOutput
-Required.JsonInput.RepeatedBoolWrapper.JsonOutput
-Required.JsonInput.RepeatedBoolWrapper.ProtobufOutput
-Required.JsonInput.RepeatedBytesWrapper.JsonOutput
-Required.JsonInput.RepeatedBytesWrapper.ProtobufOutput
-Required.JsonInput.RepeatedDoubleWrapper.JsonOutput
-Required.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
-Required.JsonInput.RepeatedFieldWrongElementTypeExpectingStringsGotInt
-Required.JsonInput.RepeatedFloatWrapper.JsonOutput
-Required.JsonInput.RepeatedFloatWrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt32Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedInt64Wrapper.JsonOutput
-Required.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedStringWrapper.JsonOutput
-Required.JsonInput.RepeatedStringWrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint32Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
-Required.JsonInput.RepeatedUint64Wrapper.JsonOutput
-Required.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
-Required.JsonInput.StringFieldNotAString
-Required.JsonInput.StringFieldSurrogatePair.JsonOutput
-Required.JsonInput.StringFieldSurrogatePair.ProtobufOutput
-Required.JsonInput.Struct.JsonOutput
-Required.JsonInput.Struct.ProtobufOutput
-Required.JsonInput.TimestampMaxValue.JsonOutput
-Required.JsonInput.TimestampMaxValue.ProtobufOutput
-Required.JsonInput.TimestampMinValue.JsonOutput
-Required.JsonInput.TimestampMinValue.ProtobufOutput
-Required.JsonInput.TimestampRepeatedValue.JsonOutput
-Required.JsonInput.TimestampRepeatedValue.ProtobufOutput
-Required.JsonInput.TimestampWithNegativeOffset.JsonOutput
-Required.JsonInput.TimestampWithNegativeOffset.ProtobufOutput
-Required.JsonInput.TimestampWithPositiveOffset.JsonOutput
-Required.JsonInput.TimestampWithPositiveOffset.ProtobufOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.JsonOutput
-Required.JsonInput.Uint32FieldMaxFloatValue.ProtobufOutput
-Required.JsonInput.Uint32MapField.JsonOutput
-Required.JsonInput.Uint32MapField.ProtobufOutput
-Required.JsonInput.Uint64FieldMaxValue.JsonOutput
-Required.JsonInput.Uint64FieldMaxValue.ProtobufOutput
-Required.JsonInput.Uint64MapField.JsonOutput
-Required.JsonInput.Uint64MapField.ProtobufOutput
-Required.JsonInput.ValueAcceptBool.JsonOutput
-Required.JsonInput.ValueAcceptBool.ProtobufOutput
-Required.JsonInput.ValueAcceptFloat.JsonOutput
-Required.JsonInput.ValueAcceptFloat.ProtobufOutput
-Required.JsonInput.ValueAcceptInteger.JsonOutput
-Required.JsonInput.ValueAcceptInteger.ProtobufOutput
-Required.JsonInput.ValueAcceptList.JsonOutput
-Required.JsonInput.ValueAcceptList.ProtobufOutput
-Required.JsonInput.ValueAcceptNull.JsonOutput
-Required.JsonInput.ValueAcceptNull.ProtobufOutput
-Required.JsonInput.ValueAcceptObject.JsonOutput
-Required.JsonInput.ValueAcceptObject.ProtobufOutput
-Required.JsonInput.ValueAcceptString.JsonOutput
-Required.JsonInput.ValueAcceptString.ProtobufOutput
-Required.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
-Required.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
+Required.Proto3.JsonInput.Any.JsonOutput
+Required.Proto3.JsonInput.Any.ProtobufOutput
+Required.Proto3.JsonInput.AnyNested.JsonOutput
+Required.Proto3.JsonInput.AnyNested.ProtobufOutput
+Required.Proto3.JsonInput.AnyUnorderedTypeTag.JsonOutput
+Required.Proto3.JsonInput.AnyUnorderedTypeTag.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithDuration.JsonOutput
+Required.Proto3.JsonInput.AnyWithDuration.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithFieldMask.JsonOutput
+Required.Proto3.JsonInput.AnyWithFieldMask.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithInt32ValueWrapper.JsonOutput
+Required.Proto3.JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithStruct.JsonOutput
+Required.Proto3.JsonInput.AnyWithStruct.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithTimestamp.JsonOutput
+Required.Proto3.JsonInput.AnyWithTimestamp.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithValueForInteger.JsonOutput
+Required.Proto3.JsonInput.AnyWithValueForInteger.ProtobufOutput
+Required.Proto3.JsonInput.AnyWithValueForJsonObject.JsonOutput
+Required.Proto3.JsonInput.AnyWithValueForJsonObject.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMaxNegativeValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMaxNegativeValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldMinPositiveValue.JsonOutput
+Required.Proto3.JsonInput.DoubleFieldMinPositiveValue.ProtobufOutput
+Required.Proto3.JsonInput.DoubleFieldNan.JsonOutput
+Required.Proto3.JsonInput.DurationMaxValue.JsonOutput
+Required.Proto3.JsonInput.DurationMaxValue.ProtobufOutput
+Required.Proto3.JsonInput.DurationMinValue.JsonOutput
+Required.Proto3.JsonInput.DurationMinValue.ProtobufOutput
+Required.Proto3.JsonInput.DurationRepeatedValue.JsonOutput
+Required.Proto3.JsonInput.DurationRepeatedValue.ProtobufOutput
+Required.Proto3.JsonInput.FieldMask.JsonOutput
+Required.Proto3.JsonInput.FieldMask.ProtobufOutput
+Required.Proto3.JsonInput.FloatFieldInfinity.JsonOutput
+Required.Proto3.JsonInput.FloatFieldNan.JsonOutput
+Required.Proto3.JsonInput.FloatFieldNegativeInfinity.JsonOutput
+Required.Proto3.JsonInput.OneofFieldDuplicate
+Required.Proto3.JsonInput.OptionalBoolWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalBoolWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalBytesWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalBytesWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalDoubleWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalDoubleWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalFloatWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalFloatWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalInt32Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalInt32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalInt64Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalInt64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalStringWrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalStringWrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalUint32Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalUint32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalUint64Wrapper.JsonOutput
+Required.Proto3.JsonInput.OptionalUint64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
+Required.Proto3.JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedBoolWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedBoolWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedBytesWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedBytesWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedDoubleWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedDoubleWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedFloatWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedFloatWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedInt32Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedInt32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedInt64Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedInt64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedStringWrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedStringWrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedUint32Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedUint32Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.RepeatedUint64Wrapper.JsonOutput
+Required.Proto3.JsonInput.RepeatedUint64Wrapper.ProtobufOutput
+Required.Proto3.JsonInput.StringFieldSurrogatePair.JsonOutput
+Required.Proto3.JsonInput.StringFieldSurrogatePair.ProtobufOutput
+Required.Proto3.JsonInput.Struct.JsonOutput
+Required.Proto3.JsonInput.Struct.ProtobufOutput
+Required.Proto3.JsonInput.TimestampMaxValue.JsonOutput
+Required.Proto3.JsonInput.TimestampMaxValue.ProtobufOutput
+Required.Proto3.JsonInput.TimestampMinValue.JsonOutput
+Required.Proto3.JsonInput.TimestampMinValue.ProtobufOutput
+Required.Proto3.JsonInput.TimestampRepeatedValue.JsonOutput
+Required.Proto3.JsonInput.TimestampRepeatedValue.ProtobufOutput
+Required.Proto3.JsonInput.TimestampWithNegativeOffset.JsonOutput
+Required.Proto3.JsonInput.TimestampWithNegativeOffset.ProtobufOutput
+Required.Proto3.JsonInput.TimestampWithPositiveOffset.JsonOutput
+Required.Proto3.JsonInput.TimestampWithPositiveOffset.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptBool.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptBool.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptFloat.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptFloat.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptInteger.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptInteger.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptList.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptList.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptListWithNull.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptListWithNull.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptNull.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptNull.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptObject.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptObject.ProtobufOutput
+Required.Proto3.JsonInput.ValueAcceptString.JsonOutput
+Required.Proto3.JsonInput.ValueAcceptString.ProtobufOutput
+Required.Proto3.ProtobufInput.DoubleFieldNormalizeQuietNan.JsonOutput
+Required.Proto3.ProtobufInput.DoubleFieldNormalizeSignalingNan.JsonOutput
+Required.Proto3.ProtobufInput.FloatFieldNormalizeQuietNan.JsonOutput
+Required.Proto3.ProtobufInput.FloatFieldNormalizeSignalingNan.JsonOutput
+Required.Proto3.ProtobufInput.ValidDataRepeated.FLOAT.JsonOutput
 Required.TimestampProtoInputTooLarge.JsonOutput
 Required.TimestampProtoInputTooSmall.JsonOutput
diff --git a/conformance/update_failure_list.py b/conformance/update_failure_list.py
index 69f210e3..ad42ed3c 100755
--- a/conformance/update_failure_list.py
+++ b/conformance/update_failure_list.py
@@ -35,7 +35,6 @@ This is sort of like comm(1), except it recognizes comments and ignores them.
 """
 
 import argparse
-import fileinput
 
 parser = argparse.ArgumentParser(
     description='Adds/removes failures from the failure list.')
@@ -57,12 +56,13 @@ for remove_file in (args.remove_list or []):
   with open(remove_file) as f:
     for line in f:
       if line in add_set:
-        raise "Asked to both add and remove test: " + line
+        raise Exception("Asked to both add and remove test: " + line)
       remove_set.add(line.strip())
 
 add_list = sorted(add_set, reverse=True)
 
-existing_list = file(args.filename).read()
+with open(args.filename) as in_file:
+    existing_list = in_file.read()
 
 with open(args.filename, "w") as f:
   for line in existing_list.splitlines(True):
diff --git a/csharp/Google.Protobuf.Tools.nuspec b/csharp/Google.Protobuf.Tools.nuspec
index 0b9cbcf4..4294949f 100644
--- a/csharp/Google.Protobuf.Tools.nuspec
+++ b/csharp/Google.Protobuf.Tools.nuspec
@@ -5,7 +5,7 @@
     <title>Google Protocol Buffers tools</title>
     <summary>Tools for Protocol Buffers - Google's data interchange format.</summary>
     <description>See project site for more info.</description>
-    <version>3.2.0</version>
+    <version>3.5.2</version>
     <authors>Google Inc.</authors>
     <owners>protobuf-packages</owners>
     <licenseUrl>https://github.com/google/protobuf/blob/master/LICENSE</licenseUrl>
diff --git a/csharp/README.md b/csharp/README.md
index 65d2311f..9d1225f1 100644
--- a/csharp/README.md
+++ b/csharp/README.md
@@ -31,28 +31,27 @@ which only uses features from C# 3 and earlier.
 Building
 ========
 
-Open the `src/Google.Protobuf.sln` solution in Visual Studio 2015 or
+Open the `src/Google.Protobuf.sln` solution in Visual Studio 2017 or
 later.
 
 Although *users* of this project are only expected to have Visual
 Studio 2012 or later, *developers* of the library are required to
-have Visual Studio 2015 or later, as the library uses C# 6 features
-in its implementation. These features have no impact when using the
-compiled code - they're only relevant when building the
-`Google.Protobuf` assembly.
+have Visual Studio 2017 or later, as the library uses C# 6 features
+in its implementation, as well as the new Visual Studio 2017 csproj 
+format. These features have no impact when using the compiled code - 
+they're only relevant when building the `Google.Protobuf` assembly.
+
+In order to run and debug the AddressBook example in the IDE, you must
+install the optional component, ".Net Core 1.0 - 1.1 development tools
+for Web" (as it's labelled in current versions of the VS2017
+installer), above and beyond the main .NET Core cross-platform
+development feature.
 
 Testing
 =======
 
-The unit tests use [NUnit 3](https://github.com/nunit/nunit). Vanilla NUnit doesn't 
-support .NET Core, so to run the tests you'll need to use 
-[dotnet-test-nunit](https://github.com/nunit/dotnet-test-nunit). 
-`dotnet-test-nunit` can also run tests for .NET 4.5+, so to run the tests 
-for both .NET Core and .NET 4.5, you can simply open the 
-`Package Manager Console` in Visual Studio and execute:
-```
-dotnet test Google.Protobuf.Test
-```
+The unit tests use [NUnit 3](https://github.com/nunit/nunit). Tests can be
+run using the Visual Studio Test Explorer or `dotnet test`.
 
 .NET 3.5
 ========
@@ -62,35 +61,15 @@ to make enabling .NET 3.5 support relatively painless in case you require it.
 There's no guarantee that this will continue in the future, so rely on .NET 
 3.5 support at your peril.
 
-To enable .NET 3.5 support:
-
-1. Modify [src/Google.Protobuf/project.json](src/Google.Protobuf/project.json) to add `"net35": {}` to `"frameworks"`.
-2. Modify [src/Google.Protobuf.Test/project.json](src/Google.Protobuf/project.json):
-  1. Add `"net35": {}` to `"frameworks"`.
-  2. `dotnet-test-nunit` doesn't support .NET 3.5, so remove it from 
-  the project-wide `"dependencies"` and add it to the framework-specific 
-  dependencies under `"net451"` and `"netcoreapp1.0"`.
-
-Note that `dotnet-test-nunit` doesn't support .NET 3.5. You can instead run the 
-tests with [NUnit 3 console](https://github.com/nunit/nunit-console) 
-by running something like: 
-```
-nunit3-console.exe "Google.Protobuf.Test\bin\Debug\net35\win7-x64\Google.Protobuf.Test.dll" --inprocess
-```
-
-The exact path may differ depending on your environment (e.g., the `win7-x64` 
-directory may be called something else). The `--inprocess` flag seems to be a 
-necessary workaround for a bug in NUnit; otherwise, you'll receive 
-an error "Exception has been thrown by the target of an invocation" 
-([possibly related issue](https://github.com/nunit/nunit/issues/1480)).
-
-If you still want to run the .NET 4.5 and .NET Core tests, you can do so by 
-specifying the framework when using `dotnet-test-nunit`, i.e. from 
-`Package Manager Console` in Visual Studio:
-```
-dotnet test Google.Protobuf.Test --framework netcoreapp1.0
-dotnet test Google.Protobuf.Test --framework net451
-```
+To enable .NET 3.5 support, you must edit the `TargetFrameworks` elements of 
+[src/Google.Protobuf/Google.Protobuf.csproj](src/Google.Protobuf/Google.Protobuf.csproj) 
+(and [src/Google.Protobuf.Test/Google.Protobuf.Test.csproj](src/Google.Protobuf.Test/Google.Protobuf.Test.csproj) 
+if you want to run the unit tests): 
+
+Open the .csproj file in a text editor and simply add `net35` to the list of 
+target frameworks, noting that the `TargetFrameworks` element appears twice in 
+the file (once in the first `PropertyGroup` element, and again in the second 
+`PropertyGroup` element, i.e., the one with the conditional).
 
 History of C# protobufs
 =======================
diff --git a/csharp/build_packages.bat b/csharp/build_packages.bat
index 37732e7c..8157bbab 100644
--- a/csharp/build_packages.bat
+++ b/csharp/build_packages.bat
@@ -1,7 +1,7 @@
 @rem Builds Google.Protobuf NuGet packages
 
-dotnet restore src
-dotnet pack -c Release src\Google.Protobuf || goto :error
+dotnet restore src/Google.Protobuf.sln
+dotnet pack -c Release src/Google.Protobuf.sln /p:SourceLinkCreate=true || goto :error
 
 goto :EOF
 
diff --git a/csharp/buildall.sh b/csharp/buildall.sh
index cab32229..50d8906d 100755
--- a/csharp/buildall.sh
+++ b/csharp/buildall.sh
@@ -6,11 +6,12 @@ SRC=$(dirname $0)/src
 set -ex
 
 echo Building relevant projects.
-dotnet build -c $CONFIG $SRC/Google.Protobuf $SRC/Google.Protobuf.Test $SRC/Google.Protobuf.Conformance
+dotnet restore $SRC/Google.Protobuf.sln
+dotnet build -c $CONFIG $SRC/Google.Protobuf.sln
 
 echo Running tests.
 # Only test netcoreapp1.0, which uses the .NET Core runtime.
 # If we want to test the .NET 4.5 version separately, we could
 # run Mono explicitly. However, we don't have any differences between
 # the .NET 4.5 and netstandard1.0 assemblies.
-dotnet test -c $CONFIG -f netcoreapp1.0 $SRC/Google.Protobuf.Test
+dotnet test -c $CONFIG -f netcoreapp1.0 $SRC/Google.Protobuf.Test/Google.Protobuf.Test.csproj
diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedInputStreamTest.cs b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedInputStreamTest.cs
index c0a9ffd1..ff44895c 100644
--- a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedInputStreamTest.cs
+++ b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedInputStreamTest.cs
@@ -403,7 +403,7 @@ namespace Google.Protobuf
                 output.Flush();

 

                 ms.Position = 0;

-                CodedInputStream input = new CodedInputStream(ms, new byte[ms.Length / 2], 0, 0);

+                CodedInputStream input = new CodedInputStream(ms, new byte[ms.Length / 2], 0, 0, false);

 

                 uint tag = input.ReadTag();

                 Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));

diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedOutputStreamTest.cs b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
index 48bf6d60..01bd3218 100644
--- a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
+++ b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
@@ -334,7 +334,7 @@ namespace Google.Protobuf
             }

             // Now test Input stream:

             {

-                CodedInputStream cin = new CodedInputStream(new MemoryStream(bytes), new byte[50], 0, 0);

+                CodedInputStream cin = new CodedInputStream(new MemoryStream(bytes), new byte[50], 0, 0, false);

                 Assert.AreEqual(0, cin.Position);

                 // Field 1:

                 uint tag = cin.ReadTag();

diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/GeneratedMessageTest.cs b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/GeneratedMessageTest.cs
index 8b153d69..429c51ff 100644
--- a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/GeneratedMessageTest.cs
+++ b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/GeneratedMessageTest.cs
@@ -638,7 +638,7 @@ namespace Google.Protobuf
         }

 

         [Test]

-        public void IgnoreUnknownFields_RealDataStillRead()

+        public void DiscardUnknownFields_RealDataStillRead()

         {

             var message = SampleMessages.CreateFullTestAllTypes();

             var stream = new MemoryStream();

@@ -652,16 +652,18 @@ namespace Google.Protobuf
 

             stream.Position = 0;

             var parsed = TestAllTypes.Parser.ParseFrom(stream);

-            Assert.AreEqual(message, parsed);

+	    // TODO(jieluo): Add test back after DiscardUnknownFields is supported

+            // Assert.AreEqual(message, parsed);

         }

 

         [Test]

-        public void IgnoreUnknownFields_AllTypes()

+        public void DiscardUnknownFields_AllTypes()

         {

             // Simple way of ensuring we can skip all kinds of fields.

             var data = SampleMessages.CreateFullTestAllTypes().ToByteArray();

             var empty = Empty.Parser.ParseFrom(data);

-            Assert.AreEqual(new Empty(), empty);

+	    // TODO(jieluo): Add test back after DiscardUnknownField is supported.

+            // Assert.AreEqual(new Empty(), empty);

         }

 

         // This was originally seen as a conformance test failure.

@@ -720,4 +722,4 @@ namespace Google.Protobuf
             Assert.AreEqual("{ \"c\": 31 }", writer.ToString());

         }

     }

-}
\ No newline at end of file
+}

diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
new file mode 100644
index 00000000..06d07b9f
--- /dev/null
+++ b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
@@ -0,0 +1,30 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net451;netcoreapp1.0</TargetFrameworks>
+    <AssemblyOriginatorKeyFile>../../keys/Google.Protobuf.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
+    <IsPackable>False</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="NUnit" Version="3.6.1" />
+    <PackageReference Include="NUnitLite" Version="3.6.1" />
+  </ItemGroup>
+
+  <!-- 
+    - Override target frameworks on non-Windows to just .NET Core
+    - Doing this conditionally in the initial PropertyGroup confuses
+    - Visual Studio.
+    -->
+  <PropertyGroup Condition="'$(OS)' != 'Windows_NT'">
+    <TargetFrameworks>netcoreapp1.0</TargetFrameworks>
+  </PropertyGroup>
+  
+</Project>
diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
deleted file mode 100644
index a9a1cc04..00000000
--- a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>580eb013-d3c7-4578-b845-015f4a3b0591</ProjectGuid>
-    <RootNamespace>Google.Protobuf.Test</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Program.cs b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Program.cs
new file mode 100644
index 00000000..9078e59b
--- /dev/null
+++ b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/Program.cs
@@ -0,0 +1,47 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+using NUnitLite;
+using System.Reflection;
+
+// Note: this file wasn't in the actual 3.0, but is required due to build
+// system changes
+
+namespace Google.Protobuf.Test
+{
+    class Program
+    {
+        public static int Main(string[] args)
+        {
+            return new AutoRun(typeof(Program).GetTypeInfo().Assembly).Execute(args);
+        }
+    }
+}
\ No newline at end of file
diff --git a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/project.json b/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/project.json
deleted file mode 100644
index 87b732c9..00000000
--- a/csharp/compatibility_tests/v3.0.0/src/Google.Protobuf.Test/project.json
+++ /dev/null
@@ -1,44 +0,0 @@
-{
-  "buildOptions": {
-    "debugType": "portable",
-    "keyFile": "../../keys/Google.Protobuf.snk"
-  },
-
-  "configurations": {
-    "Debug": {
-      "buildOptions": {
-        "define": [ "DEBUG", "TRACE" ]
-      }
-    },
-    "Release": {
-      "buildOptions": {
-        "define": [ "RELEASE", "TRACE" ],
-        "optimize": true
-      }
-    }
-  },
-
-  "dependencies": {
-    "Google.Protobuf": { "target": "project" },
-    "NUnit": "3.4.0",
-    "dotnet-test-nunit": "3.4.0-alpha-2",
-  },
-
-  "testRunner": "nunit",
-
-  "frameworks": {
-    "netcoreapp1.0": {
-      "imports" : [ "dnxcore50", "netcoreapp1.0", "portable-net45+win8" ],
-      "buildOptions": {
-        "define": [ "PCL" ]
-      },
-      "dependencies": {
-        "Microsoft.NETCore.App": { 
-          "version": "1.0.0",
-          "type": "platform"
-        },
-        "System.Console": "4.0.0"
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/csharp/compatibility_tests/v3.0.0/test.sh b/csharp/compatibility_tests/v3.0.0/test.sh
index bb04fc2c..54d28dfc 100755
--- a/csharp/compatibility_tests/v3.0.0/test.sh
+++ b/csharp/compatibility_tests/v3.0.0/test.sh
@@ -18,8 +18,11 @@ function run_test() {
     protos/src/google/protobuf/map_unittest_proto3.proto
 
   # Build and test.
-  dotnet build -c release src/Google.Protobuf src/Google.Protobuf.Test
-  dotnet test -c release -f netcoreapp1.0 src/Google.Protobuf.Test
+  dotnet restore src/Google.Protobuf/Google.Protobuf.csproj
+  dotnet restore src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
+  dotnet build -c Release src/Google.Protobuf/Google.Protobuf.csproj
+  dotnet build -c Release src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
+  dotnet run -c Release -f netcoreapp1.0 -p src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
 }
 
 set -ex
@@ -72,7 +75,6 @@ chmod +x old_protoc
 # Copy the new runtime and keys.
 cp ../../src/Google.Protobuf src/Google.Protobuf -r
 cp ../../keys . -r
-dotnet restore
 
 # Test A.1:
 #   proto set 1: use old version
diff --git a/csharp/generate_protos.sh b/csharp/generate_protos.sh
index d2f47479..5c748e35 100755
--- a/csharp/generate_protos.sh
+++ b/csharp/generate_protos.sh
@@ -3,7 +3,7 @@
 # You first need to make sure protoc has been built (see instructions on
 # building protoc in root of this repository)
 
-set -ex
+set -e
 
 # cd to repository root
 pushd $(dirname $0)/..
@@ -40,28 +40,20 @@ $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf \
     src/google/protobuf/type.proto \
     src/google/protobuf/wrappers.proto
 
-# Test protos where the namespace matches the target location
-$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf.Test \
-    --csharp_opt=base_namespace=Google.Protobuf \
-    src/google/protobuf/map_unittest_proto3.proto \
-    src/google/protobuf/unittest_proto3.proto \
-    src/google/protobuf/unittest_import_proto3.proto \
-    src/google/protobuf/unittest_import_public_proto3.proto \
-    src/google/protobuf/unittest_well_known_types.proto
-
-# Different base namespace to the protos above
-$PROTOC -Isrc -Icsharp/protos --csharp_out=csharp/src/Google.Protobuf.Test \
-    --csharp_opt=base_namespace=UnitTest.Issues \
+# Test protos
+$PROTOC -Isrc -Icsharp/protos \
+    --csharp_out=csharp/src/Google.Protobuf.Test/TestProtos \
+    csharp/protos/map_unittest_proto3.proto \
     csharp/protos/unittest_issues.proto \
-    csharp/protos/unittest_custom_options_proto3.proto
-
-# Don't specify a base namespace at all; we just want to make sure the
-# results end up in TestProtos.
-$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf.Test/TestProtos \
+    csharp/protos/unittest_custom_options_proto3.proto \
+    csharp/protos/unittest_proto3.proto \
+    csharp/protos/unittest_import_proto3.proto \
+    csharp/protos/unittest_import_public_proto3.proto \
+    src/google/protobuf/unittest_well_known_types.proto \
     src/google/protobuf/test_messages_proto3.proto
 
 # AddressBook sample protos
-$PROTOC -Iexamples --csharp_out=csharp/src/AddressBook \
+$PROTOC -Iexamples -Isrc --csharp_out=csharp/src/AddressBook \
     examples/addressbook.proto
 
 $PROTOC -Iconformance -Isrc --csharp_out=csharp/src/Google.Protobuf.Conformance \
diff --git a/csharp/global.json b/csharp/global.json
new file mode 100644
index 00000000..5ab775b9
--- /dev/null
+++ b/csharp/global.json
@@ -0,0 +1,5 @@
+{
+  "sdk": {
+    "version": "2.0.3"
+  }
+}
diff --git a/csharp/protos/README.md b/csharp/protos/README.md
new file mode 100644
index 00000000..bdd66fcf
--- /dev/null
+++ b/csharp/protos/README.md
@@ -0,0 +1,3 @@
+This directory contains unit test protos adapted from those in
+src/google/protobuf, and C#-specific test protos for regression
+tests against bugs found in the C# codegen or library.
diff --git a/src/google/protobuf/map_unittest_proto3.proto b/csharp/protos/map_unittest_proto3.proto
index 16be2773..e43e858b 100644
--- a/src/google/protobuf/map_unittest_proto3.proto
+++ b/csharp/protos/map_unittest_proto3.proto
@@ -36,15 +36,11 @@
 // required fields in proto3.
 syntax = "proto3";
 
-option cc_enable_arenas = true;
 option csharp_namespace = "Google.Protobuf.TestProtos";
 
-import "google/protobuf/unittest_proto3.proto";
+import "unittest_proto3.proto";
 
-// We don't put this in a package within proto2 because we need to make sure
-// that the generated code doesn't depend on being in the proto2 namespace.
-// In map_test_util.h we do "using namespace unittest = protobuf_unittest".
-package protobuf_unittest;
+package protobuf_unittest3;
 
 // Tests maps.
 message TestMap {
diff --git a/src/google/protobuf/unittest_import_proto3.proto b/csharp/protos/unittest_import_proto3.proto
index 59673eaf..2e666822 100644
--- a/src/google/protobuf/unittest_import_proto3.proto
+++ b/csharp/protos/unittest_import_proto3.proto
@@ -36,24 +36,12 @@
 
 syntax = "proto3";
 
-// We don't put this in a package within proto2 because we need to make sure
-// that the generated code doesn't depend on being in the proto2 namespace.
-// In test_util.h we do
-// "using namespace unittest_import = protobuf_unittest_import".
 package protobuf_unittest_import;
 
-option optimize_for = SPEED;
-option cc_enable_arenas = true;
-
-// Exercise the java_package option.
-option java_package = "com.google.protobuf.test";
 option csharp_namespace = "Google.Protobuf.TestProtos";
 
-// Do not set a java_outer_classname here to verify that Proto2 works without
-// one.
-
 // Test public import
-import public "google/protobuf/unittest_import_public_proto3.proto";
+import public "unittest_import_public_proto3.proto";
 
 message ImportMessage {
   int32 d = 1;
diff --git a/src/google/protobuf/unittest_import_public_proto3.proto b/csharp/protos/unittest_import_public_proto3.proto
index d6f11e28..88c20799 100644
--- a/src/google/protobuf/unittest_import_public_proto3.proto
+++ b/csharp/protos/unittest_import_public_proto3.proto
@@ -34,7 +34,6 @@ syntax = "proto3";
 
 package protobuf_unittest_import;
 
-option java_package = "com.google.protobuf.test";
 option csharp_namespace = "Google.Protobuf.TestProtos";
 
 message PublicImportMessage {
diff --git a/csharp/protos/unittest_issues.proto b/csharp/protos/unittest_issues.proto
index 6c9f7634..0d8793e1 100644
--- a/csharp/protos/unittest_issues.proto
+++ b/csharp/protos/unittest_issues.proto
@@ -7,7 +7,6 @@ syntax = "proto3";
 option csharp_namespace = "UnitTest.Issues.TestProtos";
 
 package unittest_issues;
-option optimize_for = SPEED;
 
 // Issue 307: when generating doubly-nested types, any references
 // should be of the form A.Types.B.Types.C.
@@ -124,3 +123,18 @@ message TestJsonName {
   string description = 2 [json_name = "desc"];
   string guid = 3 [json_name = "exid"];
 }
+
+// Issue 3200: When merging two messages which use the same
+// oneof case, which is itself a message type, the submessages should
+// be merged.
+message OneofMerging {
+  message Nested {
+    int32 x = 1;
+    int32 y = 2;
+  }
+
+  oneof value {
+    string text = 1;
+    Nested nested = 2;
+  }
+}
\ No newline at end of file
diff --git a/csharp/protos/unittest_proto3.proto b/csharp/protos/unittest_proto3.proto
new file mode 100644
index 00000000..ef4933a5
--- /dev/null
+++ b/csharp/protos/unittest_proto3.proto
@@ -0,0 +1,380 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// A proto file we will use for unit testing.
+
+syntax = "proto3";
+
+option csharp_namespace = "Google.Protobuf.TestProtos";
+
+// Only present so we can test that we can read it (as an example
+// of a non-C# option)
+option java_outer_classname = "UnittestProto";
+
+import "unittest_import_proto3.proto";
+
+package protobuf_unittest3;
+
+// This proto includes every type of field in both singular and repeated
+// forms.
+message TestAllTypes {
+  message NestedMessage {
+    // The field name "b" fails to compile in proto1 because it conflicts with
+    // a local variable named "b" in one of the generated methods.  Doh.
+    // This file needs to compile in proto1 to test backwards-compatibility.
+    int32 bb = 1;
+  }
+
+  enum NestedEnum {
+    NESTED_ENUM_UNSPECIFIED = 0;
+    FOO = 1;
+    BAR = 2;
+    BAZ = 3;
+    NEG = -1;  // Intentionally negative.
+  }
+
+  // Singular
+  int32 single_int32 = 1;
+  int64 single_int64 = 2;
+  uint32 single_uint32 = 3;
+  uint64 single_uint64 = 4;
+  sint32 single_sint32 = 5;
+  sint64 single_sint64 = 6;
+  fixed32 single_fixed32 = 7;
+  fixed64 single_fixed64 = 8;
+  sfixed32 single_sfixed32 = 9;
+  sfixed64 single_sfixed64 = 10;
+  float single_float = 11;
+  double single_double = 12;
+  bool single_bool = 13;
+  string single_string = 14;
+  bytes single_bytes = 15;
+
+  NestedMessage single_nested_message = 18;
+  ForeignMessage single_foreign_message = 19;
+  protobuf_unittest_import.ImportMessage single_import_message = 20;
+
+  NestedEnum single_nested_enum = 21;
+  ForeignEnum single_foreign_enum = 22;
+  protobuf_unittest_import.ImportEnum single_import_enum = 23;
+
+  // Defined in unittest_import_public.proto
+  protobuf_unittest_import.PublicImportMessage
+      single_public_import_message = 26;
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated NestedMessage                        repeated_nested_message  = 48;
+  repeated ForeignMessage                       repeated_foreign_message = 49;
+  repeated protobuf_unittest_import.ImportMessage repeated_import_message  = 50;
+
+  repeated NestedEnum                           repeated_nested_enum     = 51;
+  repeated ForeignEnum                          repeated_foreign_enum    = 52;
+  repeated protobuf_unittest_import.ImportEnum    repeated_import_enum     = 53;
+  // Defined in unittest_import_public.proto
+  repeated protobuf_unittest_import.PublicImportMessage
+      repeated_public_import_message = 54;
+
+  // For oneof test
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    NestedMessage oneof_nested_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+  }
+}
+
+// This proto includes a recusively nested message.
+message NestedTestAllTypes {
+  NestedTestAllTypes child = 1;
+  TestAllTypes payload = 2;
+  repeated NestedTestAllTypes repeated_child = 3;
+}
+
+message TestDeprecatedFields {
+  int32 deprecated_int32 = 1 [deprecated=true];
+}
+
+// Define these after TestAllTypes to make sure the compiler can handle
+// that.
+message ForeignMessage {
+  int32 c = 1;
+}
+
+enum ForeignEnum {
+  FOREIGN_UNSPECIFIED = 0;
+  FOREIGN_FOO = 4;
+  FOREIGN_BAR = 5;
+  FOREIGN_BAZ = 6;
+}
+
+message TestReservedFields {
+  reserved 2, 15, 9 to 11;
+  reserved "bar", "baz";
+}
+
+
+// Test that we can use NestedMessage from outside TestAllTypes.
+message TestForeignNested {
+  TestAllTypes.NestedMessage foreign_nested = 1;
+}
+
+// Test that really large tag numbers don't break anything.
+message TestReallyLargeTagNumber {
+  // The largest possible tag number is 2^28 - 1, since the wire format uses
+  // three bits to communicate wire type.
+  int32 a = 1;
+  int32 bb = 268435455;
+}
+
+message TestRecursiveMessage {
+  TestRecursiveMessage a = 1;
+  int32 i = 2;
+}
+
+// Test that mutual recursion works.
+message TestMutualRecursionA {
+  TestMutualRecursionB bb = 1;
+}
+
+message TestMutualRecursionB {
+  TestMutualRecursionA a = 1;
+  int32 optional_int32 = 2;
+}
+
+message TestEnumAllowAlias {
+  TestEnumWithDupValue value = 1;
+}
+
+// Test an enum that has multiple values with the same number.
+enum TestEnumWithDupValue {
+  TEST_ENUM_WITH_DUP_VALUE_UNSPECIFIED = 0;
+  option allow_alias = true;
+
+  FOO1 = 1;
+  BAR1 = 2;
+  BAZ = 3;
+  FOO2 = 1;
+  BAR2 = 2;
+}
+
+// Test an enum with large, unordered values.
+enum TestSparseEnum {
+  TEST_SPARSE_ENUM_UNSPECIFIED = 0;
+  SPARSE_A = 123;
+  SPARSE_B = 62374;
+  SPARSE_C = 12589234;
+  SPARSE_D = -15;
+  SPARSE_E = -53452;
+  // In proto3, value 0 must be the first one specified
+  // SPARSE_F = 0;
+  SPARSE_G = 2;
+}
+
+// Test message with CamelCase field names.  This violates Protocol Buffer
+// standard style.
+message TestCamelCaseFieldNames {
+  int32 PrimitiveField = 1;
+  string StringField = 2;
+  ForeignEnum EnumField = 3;
+  ForeignMessage MessageField = 4;
+
+  repeated int32 RepeatedPrimitiveField = 7;
+  repeated string RepeatedStringField = 8;
+  repeated ForeignEnum RepeatedEnumField = 9;
+  repeated ForeignMessage RepeatedMessageField = 10;
+}
+
+
+// We list fields out of order, to ensure that we're using field number and not
+// field index to determine serialization order.
+message TestFieldOrderings {
+  string my_string = 11;
+  int64 my_int = 1;
+  float my_float = 101;
+  message NestedMessage {
+    int64 oo = 2;
+    // The field name "b" fails to compile in proto1 because it conflicts with
+    // a local variable named "b" in one of the generated methods.  Doh.
+    // This file needs to compile in proto1 to test backwards-compatibility.
+    int32 bb = 1;
+  }
+
+  NestedMessage single_nested_message  = 200;
+}
+
+message SparseEnumMessage {
+  TestSparseEnum sparse_enum = 1;
+}
+
+// Test String and Bytes: string is for valid UTF-8 strings
+message OneString {
+  string data = 1;
+}
+
+message MoreString {
+  repeated string data = 1;
+}
+
+message OneBytes {
+  bytes data = 1;
+}
+
+message MoreBytes {
+  bytes data = 1;
+}
+
+// Test int32, uint32, int64, uint64, and bool are all compatible
+message Int32Message {
+  int32 data = 1;
+}
+
+message Uint32Message {
+  uint32 data = 1;
+}
+
+message Int64Message {
+  int64 data = 1;
+}
+
+message Uint64Message {
+  uint64 data = 1;
+}
+
+message BoolMessage {
+  bool data = 1;
+}
+
+// Test oneofs.
+message TestOneof {
+  oneof foo {
+    int32 foo_int = 1;
+    string foo_string = 2;
+    TestAllTypes foo_message = 3;
+  }
+}
+
+// Test messages for packed fields
+
+message TestPackedTypes {
+  repeated    int32 packed_int32    =  90 [packed = true];
+  repeated    int64 packed_int64    =  91 [packed = true];
+  repeated   uint32 packed_uint32   =  92 [packed = true];
+  repeated   uint64 packed_uint64   =  93 [packed = true];
+  repeated   sint32 packed_sint32   =  94 [packed = true];
+  repeated   sint64 packed_sint64   =  95 [packed = true];
+  repeated  fixed32 packed_fixed32  =  96 [packed = true];
+  repeated  fixed64 packed_fixed64  =  97 [packed = true];
+  repeated sfixed32 packed_sfixed32 =  98 [packed = true];
+  repeated sfixed64 packed_sfixed64 =  99 [packed = true];
+  repeated    float packed_float    = 100 [packed = true];
+  repeated   double packed_double   = 101 [packed = true];
+  repeated     bool packed_bool     = 102 [packed = true];
+  repeated ForeignEnum packed_enum  = 103 [packed = true];
+}
+
+// A message with the same fields as TestPackedTypes, but without packing. Used
+// to test packed <-> unpacked wire compatibility.
+message TestUnpackedTypes {
+  repeated    int32 unpacked_int32    =  90 [packed = false];
+  repeated    int64 unpacked_int64    =  91 [packed = false];
+  repeated   uint32 unpacked_uint32   =  92 [packed = false];
+  repeated   uint64 unpacked_uint64   =  93 [packed = false];
+  repeated   sint32 unpacked_sint32   =  94 [packed = false];
+  repeated   sint64 unpacked_sint64   =  95 [packed = false];
+  repeated  fixed32 unpacked_fixed32  =  96 [packed = false];
+  repeated  fixed64 unpacked_fixed64  =  97 [packed = false];
+  repeated sfixed32 unpacked_sfixed32 =  98 [packed = false];
+  repeated sfixed64 unpacked_sfixed64 =  99 [packed = false];
+  repeated    float unpacked_float    = 100 [packed = false];
+  repeated   double unpacked_double   = 101 [packed = false];
+  repeated     bool unpacked_bool     = 102 [packed = false];
+  repeated ForeignEnum unpacked_enum  = 103 [packed = false];
+}
+
+message TestRepeatedScalarDifferentTagSizes {
+  // Parsing repeated fixed size values used to fail. This message needs to be
+  // used in order to get a tag of the right size; all of the repeated fields
+  // in TestAllTypes didn't trigger the check.
+  repeated fixed32 repeated_fixed32 = 12;
+  // Check for a varint type, just for good measure.
+  repeated int32   repeated_int32   = 13;
+
+  // These have two-byte tags.
+  repeated fixed64 repeated_fixed64 = 2046;
+  repeated int64   repeated_int64   = 2047;
+
+  // Three byte tags.
+  repeated float   repeated_float   = 262142;
+  repeated uint64  repeated_uint64  = 262143;
+}
+
+message TestCommentInjectionMessage {
+  // */ <- This should not close the generated doc comment
+  string a = 1;
+}
+
+
+// Test that RPC services work.
+message FooRequest  {}
+message FooResponse {}
+
+message FooClientMessage {}
+message FooServerMessage{}
+
+service TestService {
+  rpc Foo(FooRequest) returns (FooResponse);
+  rpc Bar(BarRequest) returns (BarResponse);
+}
+
+
+message BarRequest  {}
+message BarResponse {}
+
+message TestEmptyMessage {}
diff --git a/csharp/src/AddressBook/AddressBook.csproj b/csharp/src/AddressBook/AddressBook.csproj
new file mode 100644
index 00000000..6edfdcab
--- /dev/null
+++ b/csharp/src/AddressBook/AddressBook.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp1.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <StartupObject>Google.Protobuf.Examples.AddressBook.Program</StartupObject>
+    <IsPackable>False</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/csharp/src/AddressBook/AddressBook.xproj b/csharp/src/AddressBook/AddressBook.xproj
deleted file mode 100644
index 4c9925e8..00000000
--- a/csharp/src/AddressBook/AddressBook.xproj
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>afb63919-1e05-43b4-802a-8fb8c9b2f463</ProjectGuid>
-    <RootNamespace>AddressBook</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/src/AddressBook/Addressbook.cs b/csharp/src/AddressBook/Addressbook.cs
index 75ed071b..21a8ce02 100644
--- a/csharp/src/AddressBook/Addressbook.cs
+++ b/csharp/src/AddressBook/Addressbook.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: addressbook.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: addressbook.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -22,19 +24,21 @@ namespace Google.Protobuf.Examples.AddressBook {
     static AddressbookReflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "ChFhZGRyZXNzYm9vay5wcm90bxIIdHV0b3JpYWwi1QEKBlBlcnNvbhIMCgRu",
-            "YW1lGAEgASgJEgoKAmlkGAIgASgFEg0KBWVtYWlsGAMgASgJEiwKBnBob25l",
-            "cxgEIAMoCzIcLnR1dG9yaWFsLlBlcnNvbi5QaG9uZU51bWJlchpHCgtQaG9u",
-            "ZU51bWJlchIOCgZudW1iZXIYASABKAkSKAoEdHlwZRgCIAEoDjIaLnR1dG9y",
-            "aWFsLlBlcnNvbi5QaG9uZVR5cGUiKwoJUGhvbmVUeXBlEgoKBk1PQklMRRAA",
-            "EggKBEhPTUUQARIICgRXT1JLEAIiLwoLQWRkcmVzc0Jvb2sSIAoGcGVvcGxl",
-            "GAEgAygLMhAudHV0b3JpYWwuUGVyc29uQlAKFGNvbS5leGFtcGxlLnR1dG9y",
-            "aWFsQhFBZGRyZXNzQm9va1Byb3Rvc6oCJEdvb2dsZS5Qcm90b2J1Zi5FeGFt",
-            "cGxlcy5BZGRyZXNzQm9va2IGcHJvdG8z"));
+            "ChFhZGRyZXNzYm9vay5wcm90bxIIdHV0b3JpYWwaH2dvb2dsZS9wcm90b2J1",
+            "Zi90aW1lc3RhbXAucHJvdG8ihwIKBlBlcnNvbhIMCgRuYW1lGAEgASgJEgoK",
+            "AmlkGAIgASgFEg0KBWVtYWlsGAMgASgJEiwKBnBob25lcxgEIAMoCzIcLnR1",
+            "dG9yaWFsLlBlcnNvbi5QaG9uZU51bWJlchIwCgxsYXN0X3VwZGF0ZWQYBSAB",
+            "KAsyGi5nb29nbGUucHJvdG9idWYuVGltZXN0YW1wGkcKC1Bob25lTnVtYmVy",
+            "Eg4KBm51bWJlchgBIAEoCRIoCgR0eXBlGAIgASgOMhoudHV0b3JpYWwuUGVy",
+            "c29uLlBob25lVHlwZSIrCglQaG9uZVR5cGUSCgoGTU9CSUxFEAASCAoESE9N",
+            "RRABEggKBFdPUksQAiIvCgtBZGRyZXNzQm9vaxIgCgZwZW9wbGUYASADKAsy",
+            "EC50dXRvcmlhbC5QZXJzb25CUAoUY29tLmV4YW1wbGUudHV0b3JpYWxCEUFk",
+            "ZHJlc3NCb29rUHJvdG9zqgIkR29vZ2xlLlByb3RvYnVmLkV4YW1wbGVzLkFk",
+            "ZHJlc3NCb29rYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
-          new pbr::FileDescriptor[] { },
+          new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person), global::Google.Protobuf.Examples.AddressBook.Person.Parser, new[]{ "Name", "Id", "Email", "Phones" }, null, new[]{ typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType) }, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber), global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber.Parser, new[]{ "Number", "Type" }, null, null, null)}),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person), global::Google.Protobuf.Examples.AddressBook.Person.Parser, new[]{ "Name", "Id", "Email", "Phones", "LastUpdated" }, null, new[]{ typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType) }, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber), global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber.Parser, new[]{ "Number", "Type" }, null, null, null)}),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.AddressBook), global::Google.Protobuf.Examples.AddressBook.AddressBook.Parser, new[]{ "People" }, null, null, null)
           }));
     }
@@ -47,6 +51,7 @@ namespace Google.Protobuf.Examples.AddressBook {
   /// </summary>
   public sealed partial class Person : pb::IMessage<Person> {
     private static readonly pb::MessageParser<Person> _parser = new pb::MessageParser<Person>(() => new Person());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Person> Parser { get { return _parser; } }
 
@@ -73,6 +78,8 @@ namespace Google.Protobuf.Examples.AddressBook {
       id_ = other.id_;
       email_ = other.email_;
       phones_ = other.phones_.Clone();
+      lastUpdated_ = other.lastUpdated_ != null ? other.lastUpdated_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -126,6 +133,17 @@ namespace Google.Protobuf.Examples.AddressBook {
       get { return phones_; }
     }
 
+    /// <summary>Field number for the "last_updated" field.</summary>
+    public const int LastUpdatedFieldNumber = 5;
+    private global::Google.Protobuf.WellKnownTypes.Timestamp lastUpdated_;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public global::Google.Protobuf.WellKnownTypes.Timestamp LastUpdated {
+      get { return lastUpdated_; }
+      set {
+        lastUpdated_ = value;
+      }
+    }
+
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override bool Equals(object other) {
       return Equals(other as Person);
@@ -143,7 +161,8 @@ namespace Google.Protobuf.Examples.AddressBook {
       if (Id != other.Id) return false;
       if (Email != other.Email) return false;
       if(!phones_.Equals(other.phones_)) return false;
-      return true;
+      if (!object.Equals(LastUpdated, other.LastUpdated)) return false;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -153,6 +172,10 @@ namespace Google.Protobuf.Examples.AddressBook {
       if (Id != 0) hash ^= Id.GetHashCode();
       if (Email.Length != 0) hash ^= Email.GetHashCode();
       hash ^= phones_.GetHashCode();
+      if (lastUpdated_ != null) hash ^= LastUpdated.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -176,6 +199,13 @@ namespace Google.Protobuf.Examples.AddressBook {
         output.WriteString(Email);
       }
       phones_.WriteTo(output, _repeated_phones_codec);
+      if (lastUpdated_ != null) {
+        output.WriteRawTag(42);
+        output.WriteMessage(LastUpdated);
+      }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -191,6 +221,12 @@ namespace Google.Protobuf.Examples.AddressBook {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Email);
       }
       size += phones_.CalculateSize(_repeated_phones_codec);
+      if (lastUpdated_ != null) {
+        size += 1 + pb::CodedOutputStream.ComputeMessageSize(LastUpdated);
+      }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -209,6 +245,13 @@ namespace Google.Protobuf.Examples.AddressBook {
         Email = other.Email;
       }
       phones_.Add(other.phones_);
+      if (other.lastUpdated_ != null) {
+        if (lastUpdated_ == null) {
+          lastUpdated_ = new global::Google.Protobuf.WellKnownTypes.Timestamp();
+        }
+        LastUpdated.MergeFrom(other.LastUpdated);
+      }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -217,7 +260,7 @@ namespace Google.Protobuf.Examples.AddressBook {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -235,6 +278,13 @@ namespace Google.Protobuf.Examples.AddressBook {
             phones_.AddEntriesFrom(input, _repeated_phones_codec);
             break;
           }
+          case 42: {
+            if (lastUpdated_ == null) {
+              lastUpdated_ = new global::Google.Protobuf.WellKnownTypes.Timestamp();
+            }
+            input.ReadMessage(lastUpdated_);
+            break;
+          }
         }
       }
     }
@@ -251,6 +301,7 @@ namespace Google.Protobuf.Examples.AddressBook {
 
       public sealed partial class PhoneNumber : pb::IMessage<PhoneNumber> {
         private static readonly pb::MessageParser<PhoneNumber> _parser = new pb::MessageParser<PhoneNumber>(() => new PhoneNumber());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<PhoneNumber> Parser { get { return _parser; } }
 
@@ -275,6 +326,7 @@ namespace Google.Protobuf.Examples.AddressBook {
         public PhoneNumber(PhoneNumber other) : this() {
           number_ = other.number_;
           type_ = other.type_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -319,7 +371,7 @@ namespace Google.Protobuf.Examples.AddressBook {
           }
           if (Number != other.Number) return false;
           if (Type != other.Type) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -327,6 +379,9 @@ namespace Google.Protobuf.Examples.AddressBook {
           int hash = 1;
           if (Number.Length != 0) hash ^= Number.GetHashCode();
           if (Type != 0) hash ^= Type.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -345,6 +400,9 @@ namespace Google.Protobuf.Examples.AddressBook {
             output.WriteRawTag(16);
             output.WriteEnum((int) Type);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -356,6 +414,9 @@ namespace Google.Protobuf.Examples.AddressBook {
           if (Type != 0) {
             size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Type);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -370,6 +431,7 @@ namespace Google.Protobuf.Examples.AddressBook {
           if (other.Type != 0) {
             Type = other.Type;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -378,7 +440,7 @@ namespace Google.Protobuf.Examples.AddressBook {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 10: {
                 Number = input.ReadString();
@@ -404,6 +466,7 @@ namespace Google.Protobuf.Examples.AddressBook {
   /// </summary>
   public sealed partial class AddressBook : pb::IMessage<AddressBook> {
     private static readonly pb::MessageParser<AddressBook> _parser = new pb::MessageParser<AddressBook>(() => new AddressBook());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<AddressBook> Parser { get { return _parser; } }
 
@@ -427,6 +490,7 @@ namespace Google.Protobuf.Examples.AddressBook {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public AddressBook(AddressBook other) : this() {
       people_ = other.people_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -458,13 +522,16 @@ namespace Google.Protobuf.Examples.AddressBook {
         return true;
       }
       if(!people_.Equals(other.people_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= people_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -476,12 +543,18 @@ namespace Google.Protobuf.Examples.AddressBook {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       people_.WriteTo(output, _repeated_people_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += people_.CalculateSize(_repeated_people_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -491,6 +564,7 @@ namespace Google.Protobuf.Examples.AddressBook {
         return;
       }
       people_.Add(other.people_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -499,7 +573,7 @@ namespace Google.Protobuf.Examples.AddressBook {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             people_.AddEntriesFrom(input, _repeated_people_codec);
diff --git a/csharp/src/AddressBook/project.json b/csharp/src/AddressBook/project.json
deleted file mode 100644
index c500bdc2..00000000
--- a/csharp/src/AddressBook/project.json
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "buildOptions": {
-    "debugType": "portable",
-    "emitEntryPoint": true,
-    "additionalArguments": [ "/main:Google.Protobuf.Examples.AddressBook.Program" ]
-  },
-  "dependencies": {
-    "Google.Protobuf": { "target": "project" }
-  },
-  "frameworks": {
-    "netcoreapp1.0": {
-      "dependencies": {
-        "Microsoft.NETCore.App": {
-          "type": "platform",
-          "version": "1.0.0"
-        }
-      }
-    }
-  }
-}
diff --git a/csharp/src/Google.Protobuf.Conformance/Conformance.cs b/csharp/src/Google.Protobuf.Conformance/Conformance.cs
index 1a835aef..f6118ea2 100644
--- a/csharp/src/Google.Protobuf.Conformance/Conformance.cs
+++ b/csharp/src/Google.Protobuf.Conformance/Conformance.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: conformance.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: conformance.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -22,21 +24,21 @@ namespace Conformance {
     static ConformanceReflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "ChFjb25mb3JtYW5jZS5wcm90bxILY29uZm9ybWFuY2UijQEKEkNvbmZvcm1h",
+            "ChFjb25mb3JtYW5jZS5wcm90bxILY29uZm9ybWFuY2UiowEKEkNvbmZvcm1h",
             "bmNlUmVxdWVzdBIaChBwcm90b2J1Zl9wYXlsb2FkGAEgASgMSAASFgoManNv",
             "bl9wYXlsb2FkGAIgASgJSAASOAoXcmVxdWVzdGVkX291dHB1dF9mb3JtYXQY",
-            "AyABKA4yFy5jb25mb3JtYW5jZS5XaXJlRm9ybWF0QgkKB3BheWxvYWQisQEK",
-            "E0NvbmZvcm1hbmNlUmVzcG9uc2USFQoLcGFyc2VfZXJyb3IYASABKAlIABIZ",
-            "Cg9zZXJpYWxpemVfZXJyb3IYBiABKAlIABIXCg1ydW50aW1lX2Vycm9yGAIg",
-            "ASgJSAASGgoQcHJvdG9idWZfcGF5bG9hZBgDIAEoDEgAEhYKDGpzb25fcGF5",
-            "bG9hZBgEIAEoCUgAEhEKB3NraXBwZWQYBSABKAlIAEIICgZyZXN1bHQqNQoK",
-            "V2lyZUZvcm1hdBIPCgtVTlNQRUNJRklFRBAAEgwKCFBST1RPQlVGEAESCAoE",
-            "SlNPThACQiEKH2NvbS5nb29nbGUucHJvdG9idWYuY29uZm9ybWFuY2ViBnBy",
-            "b3RvMw=="));
+            "AyABKA4yFy5jb25mb3JtYW5jZS5XaXJlRm9ybWF0EhQKDG1lc3NhZ2VfdHlw",
+            "ZRgEIAEoCUIJCgdwYXlsb2FkIrEBChNDb25mb3JtYW5jZVJlc3BvbnNlEhUK",
+            "C3BhcnNlX2Vycm9yGAEgASgJSAASGQoPc2VyaWFsaXplX2Vycm9yGAYgASgJ",
+            "SAASFwoNcnVudGltZV9lcnJvchgCIAEoCUgAEhoKEHByb3RvYnVmX3BheWxv",
+            "YWQYAyABKAxIABIWCgxqc29uX3BheWxvYWQYBCABKAlIABIRCgdza2lwcGVk",
+            "GAUgASgJSABCCAoGcmVzdWx0KjUKCldpcmVGb3JtYXQSDwoLVU5TUEVDSUZJ",
+            "RUQQABIMCghQUk9UT0JVRhABEggKBEpTT04QAkIhCh9jb20uZ29vZ2xlLnBy",
+            "b3RvYnVmLmNvbmZvcm1hbmNlYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Conformance.WireFormat), }, new pbr::GeneratedClrTypeInfo[] {
-            new pbr::GeneratedClrTypeInfo(typeof(global::Conformance.ConformanceRequest), global::Conformance.ConformanceRequest.Parser, new[]{ "ProtobufPayload", "JsonPayload", "RequestedOutputFormat" }, new[]{ "Payload" }, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Conformance.ConformanceRequest), global::Conformance.ConformanceRequest.Parser, new[]{ "ProtobufPayload", "JsonPayload", "RequestedOutputFormat", "MessageType" }, new[]{ "Payload" }, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Conformance.ConformanceResponse), global::Conformance.ConformanceResponse.Parser, new[]{ "ParseError", "SerializeError", "RuntimeError", "ProtobufPayload", "JsonPayload", "Skipped" }, new[]{ "Result" }, null, null)
           }));
     }
@@ -62,6 +64,7 @@ namespace Conformance {
   /// </summary>
   public sealed partial class ConformanceRequest : pb::IMessage<ConformanceRequest> {
     private static readonly pb::MessageParser<ConformanceRequest> _parser = new pb::MessageParser<ConformanceRequest>(() => new ConformanceRequest());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ConformanceRequest> Parser { get { return _parser; } }
 
@@ -85,6 +88,7 @@ namespace Conformance {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ConformanceRequest(ConformanceRequest other) : this() {
       requestedOutputFormat_ = other.requestedOutputFormat_;
+      messageType_ = other.messageType_;
       switch (other.PayloadCase) {
         case PayloadOneofCase.ProtobufPayload:
           ProtobufPayload = other.ProtobufPayload;
@@ -94,6 +98,7 @@ namespace Conformance {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -137,6 +142,22 @@ namespace Conformance {
       }
     }
 
+    /// <summary>Field number for the "message_type" field.</summary>
+    public const int MessageTypeFieldNumber = 4;
+    private string messageType_ = "";
+    /// <summary>
+    /// The full name for the test message to use; for the moment, either:
+    /// protobuf_test_messages.proto3.TestAllTypesProto3 or
+    /// protobuf_test_messages.proto2.TestAllTypesProto2.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string MessageType {
+      get { return messageType_; }
+      set {
+        messageType_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
     private object payload_;
     /// <summary>Enum of possible cases for the "payload" oneof.</summary>
     public enum PayloadOneofCase {
@@ -172,8 +193,9 @@ namespace Conformance {
       if (ProtobufPayload != other.ProtobufPayload) return false;
       if (JsonPayload != other.JsonPayload) return false;
       if (RequestedOutputFormat != other.RequestedOutputFormat) return false;
+      if (MessageType != other.MessageType) return false;
       if (PayloadCase != other.PayloadCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -182,7 +204,11 @@ namespace Conformance {
       if (payloadCase_ == PayloadOneofCase.ProtobufPayload) hash ^= ProtobufPayload.GetHashCode();
       if (payloadCase_ == PayloadOneofCase.JsonPayload) hash ^= JsonPayload.GetHashCode();
       if (RequestedOutputFormat != 0) hash ^= RequestedOutputFormat.GetHashCode();
+      if (MessageType.Length != 0) hash ^= MessageType.GetHashCode();
       hash ^= (int) payloadCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -205,6 +231,13 @@ namespace Conformance {
         output.WriteRawTag(24);
         output.WriteEnum((int) RequestedOutputFormat);
       }
+      if (MessageType.Length != 0) {
+        output.WriteRawTag(34);
+        output.WriteString(MessageType);
+      }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -219,6 +252,12 @@ namespace Conformance {
       if (RequestedOutputFormat != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) RequestedOutputFormat);
       }
+      if (MessageType.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(MessageType);
+      }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -230,6 +269,9 @@ namespace Conformance {
       if (other.RequestedOutputFormat != 0) {
         RequestedOutputFormat = other.RequestedOutputFormat;
       }
+      if (other.MessageType.Length != 0) {
+        MessageType = other.MessageType;
+      }
       switch (other.PayloadCase) {
         case PayloadOneofCase.ProtobufPayload:
           ProtobufPayload = other.ProtobufPayload;
@@ -239,6 +281,7 @@ namespace Conformance {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -247,7 +290,7 @@ namespace Conformance {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             ProtobufPayload = input.ReadBytes();
@@ -261,6 +304,10 @@ namespace Conformance {
             requestedOutputFormat_ = (global::Conformance.WireFormat) input.ReadEnum();
             break;
           }
+          case 34: {
+            MessageType = input.ReadString();
+            break;
+          }
         }
       }
     }
@@ -272,6 +319,7 @@ namespace Conformance {
   /// </summary>
   public sealed partial class ConformanceResponse : pb::IMessage<ConformanceResponse> {
     private static readonly pb::MessageParser<ConformanceResponse> _parser = new pb::MessageParser<ConformanceResponse>(() => new ConformanceResponse());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ConformanceResponse> Parser { get { return _parser; } }
 
@@ -315,6 +363,7 @@ namespace Conformance {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -460,7 +509,7 @@ namespace Conformance {
       if (JsonPayload != other.JsonPayload) return false;
       if (Skipped != other.Skipped) return false;
       if (ResultCase != other.ResultCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -473,6 +522,9 @@ namespace Conformance {
       if (resultCase_ == ResultOneofCase.JsonPayload) hash ^= JsonPayload.GetHashCode();
       if (resultCase_ == ResultOneofCase.Skipped) hash ^= Skipped.GetHashCode();
       hash ^= (int) resultCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -507,6 +559,9 @@ namespace Conformance {
         output.WriteRawTag(50);
         output.WriteString(SerializeError);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -530,6 +585,9 @@ namespace Conformance {
       if (resultCase_ == ResultOneofCase.Skipped) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Skipped);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -559,6 +617,7 @@ namespace Conformance {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -567,7 +626,7 @@ namespace Conformance {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             ParseError = input.ReadString();
diff --git a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj
new file mode 100644
index 00000000..b654c0b2
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp1.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <IsPackable>False</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj" />
+    <ProjectReference Include="..\Google.Protobuf.Test\Google.Protobuf.Test.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj
deleted file mode 100644
index 99ff1465..00000000
--- a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>dddc055b-e185-4181-bab0-072f0f984569</ProjectGuid>
-    <RootNamespace>Google.Protobuf.Conformance</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Conformance/Program.cs b/csharp/src/Google.Protobuf.Conformance/Program.cs
index 00ee64f8..96dc354e 100644
--- a/csharp/src/Google.Protobuf.Conformance/Program.cs
+++ b/csharp/src/Google.Protobuf.Conformance/Program.cs
@@ -48,7 +48,7 @@ namespace Google.Protobuf.Conformance
             // This way we get the binary streams instead of readers/writers.
             var input = new BinaryReader(Console.OpenStandardInput());
             var output = new BinaryWriter(Console.OpenStandardOutput());
-            var typeRegistry = TypeRegistry.FromMessages(ProtobufTestMessages.Proto3.TestAllTypes.Descriptor);
+            var typeRegistry = TypeRegistry.FromMessages(ProtobufTestMessages.Proto3.TestAllTypesProto3.Descriptor);
 
             int count = 0;
             while (RunTest(input, output, typeRegistry))
@@ -81,18 +81,31 @@ namespace Google.Protobuf.Conformance
 
         private static ConformanceResponse PerformRequest(ConformanceRequest request, TypeRegistry typeRegistry)
         {
-            ProtobufTestMessages.Proto3.TestAllTypes message;
+            ProtobufTestMessages.Proto3.TestAllTypesProto3 message;
             try
             {
                 switch (request.PayloadCase)
                 {
                     case ConformanceRequest.PayloadOneofCase.JsonPayload:
                         var parser = new JsonParser(new JsonParser.Settings(20, typeRegistry));
-                        message = parser.Parse<ProtobufTestMessages.Proto3.TestAllTypes>(request.JsonPayload);
+                        message = parser.Parse<ProtobufTestMessages.Proto3.TestAllTypesProto3>(request.JsonPayload);
                         break;
-                    case ConformanceRequest.PayloadOneofCase.ProtobufPayload:
-                        message = ProtobufTestMessages.Proto3.TestAllTypes.Parser.ParseFrom(request.ProtobufPayload);
+                    case ConformanceRequest.PayloadOneofCase.ProtobufPayload: 
+                    {
+                        if (request.MessageType.Equals("protobuf_test_messages.proto3.TestAllTypesProto3"))
+                        {
+                            message = ProtobufTestMessages.Proto3.TestAllTypesProto3.Parser.ParseFrom(request.ProtobufPayload);
+                        }							
+                        else if (request.MessageType.Equals("protobuf_test_messages.proto2.TestAllTypesProto2")) 
+                        {
+                            return new ConformanceResponse { Skipped = "CSharp doesn't support proto2" };
+                        }
+                        else 
+                        {
+                            throw new Exception(" Protobuf request doesn't have specific payload type");
+                        }
                         break;
+                    }
                     default:
                         throw new Exception("Unsupported request payload: " + request.PayloadCase);
                 }
diff --git a/csharp/src/Google.Protobuf.Conformance/project.json b/csharp/src/Google.Protobuf.Conformance/project.json
deleted file mode 100644
index 4cf05231..00000000
--- a/csharp/src/Google.Protobuf.Conformance/project.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "buildOptions": {
-    "debugType": "portable",
-    "emitEntryPoint": true
-  },
-  "dependencies": {
-    "Google.Protobuf": { "target": "project" },
-    "Google.Protobuf.Test": { "target": "project" }
-  },
-  "frameworks": {
-    "netcoreapp1.0": {
-      "imports": [ "dnxcore50", "netcoreapp1.0", "portable-net45+win8" ],
-      "dependencies": {
-        "Microsoft.NETCore.App": {
-          "type": "platform",
-          "version": "1.0.0"
-        }
-      }
-    }
-  }
-}
diff --git a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj
new file mode 100644
index 00000000..4eda641a
--- /dev/null
+++ b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp1.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <IsPackable>False</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj
deleted file mode 100644
index 27095be5..00000000
--- a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>9695e08f-9829-497d-b95c-b38f28d48690</ProjectGuid>
-    <RootNamespace>Google.Protobuf.JsonDump</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.JsonDump/project.json b/csharp/src/Google.Protobuf.JsonDump/project.json
deleted file mode 100644
index 84b23c45..00000000
--- a/csharp/src/Google.Protobuf.JsonDump/project.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "buildOptions": {
-    "debugType": "portable",
-    "emitEntryPoint": true
-  },
-  "dependencies": {
-    "Google.Protobuf": { "target": "project" }
-  },
-  "frameworks": {
-    "netcoreapp1.0": {
-      "dependencies": {
-        "Microsoft.NETCore.App": {
-          "type": "platform",
-          "version": "1.0.0"
-        }
-      }
-    }
-  }
-}
diff --git a/csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs b/csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs
index c0a9ffd1..8795fa65 100644..100755
--- a/csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs
+++ b/csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs
@@ -284,6 +284,20 @@ namespace Google.Protobuf
             Assert.Throws<InvalidProtocolBufferException>(() => input.ReadBytes());

         }

 

+        // Representations of a tag for field 0 with various wire types

+        [Test]

+        [TestCase(0)]

+        [TestCase(1)]

+        [TestCase(2)]

+        [TestCase(3)]

+        [TestCase(4)]

+        [TestCase(5)]

+        public void ReadTag_ZeroFieldRejected(byte tag)

+        {

+            CodedInputStream cis = new CodedInputStream(new byte[] { tag });

+            Assert.Throws<InvalidProtocolBufferException>(() => cis.ReadTag());

+        }

+

         internal static TestRecursiveMessage MakeRecursiveMessage(int depth)

         {

             if (depth == 0)

@@ -403,7 +417,7 @@ namespace Google.Protobuf
                 output.Flush();

 

                 ms.Position = 0;

-                CodedInputStream input = new CodedInputStream(ms, new byte[ms.Length / 2], 0, 0);

+                CodedInputStream input = new CodedInputStream(ms, new byte[ms.Length / 2], 0, 0, false);

 

                 uint tag = input.ReadTag();

                 Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));

@@ -594,5 +608,95 @@ namespace Google.Protobuf
             }

             Assert.IsTrue(memoryStream.CanRead); // We left the stream open

         }

+

+        [Test]

+        public void Dispose_FromByteArray()

+        {

+            var stream = new CodedInputStream(new byte[10]);

+            stream.Dispose();

+        }

+

+        [Test]

+        public void TestParseMessagesCloseTo2G()

+        {

+            byte[] serializedMessage = GenerateBigSerializedMessage();

+            // How many of these big messages do we need to take us near our 2GB limit?

+            int count = Int32.MaxValue / serializedMessage.Length;

+            // Now make a MemoryStream that will fake a near-2GB stream of messages by returning

+            // our big serialized message 'count' times.

+            using (RepeatingMemoryStream stream = new RepeatingMemoryStream(serializedMessage, count))

+            {

+                Assert.DoesNotThrow(()=>TestAllTypes.Parser.ParseFrom(stream));

+            }

+        }

+

+        [Test]

+        public void TestParseMessagesOver2G()

+        {

+            byte[] serializedMessage = GenerateBigSerializedMessage();

+            // How many of these big messages do we need to take us near our 2GB limit?

+            int count = Int32.MaxValue / serializedMessage.Length;

+            // Now add one to take us over the 2GB limit

+            count++;

+            // Now make a MemoryStream that will fake a near-2GB stream of messages by returning

+            // our big serialized message 'count' times.

+            using (RepeatingMemoryStream stream = new RepeatingMemoryStream(serializedMessage, count))

+            {

+                Assert.Throws<InvalidProtocolBufferException>(() => TestAllTypes.Parser.ParseFrom(stream),

+                    "Protocol message was too large.  May be malicious.  " +

+                    "Use CodedInputStream.SetSizeLimit() to increase the size limit.");

+            }

+        }

+

+        /// <returns>A serialized big message</returns>

+        private static byte[] GenerateBigSerializedMessage()

+        {

+            byte[] value = new byte[16 * 1024 * 1024];

+            TestAllTypes message = SampleMessages.CreateFullTestAllTypes();

+            message.SingleBytes = ByteString.CopyFrom(value);

+            return message.ToByteArray();

+        }

+

+        /// <summary>

+        /// A MemoryStream that repeats a byte arrays' content a number of times.

+        /// Simulates really large input without consuming loads of memory. Used above

+        /// to test the parsing behavior when the input size exceeds 2GB or close to it.

+        /// </summary>

+        private class RepeatingMemoryStream: MemoryStream

+        {

+            private readonly byte[] bytes;

+            private readonly int maxIterations;

+            private int index = 0;

+

+            public RepeatingMemoryStream(byte[] bytes, int maxIterations)

+            {

+                this.bytes = bytes;

+                this.maxIterations = maxIterations;

+            }

+

+            public override int Read(byte[] buffer, int offset, int count)

+            {

+                if (bytes.Length == 0)

+                {

+                    return 0;

+                }

+                int numBytesCopiedTotal = 0;

+                while (numBytesCopiedTotal < count && index < maxIterations)

+                {

+                    int numBytesToCopy = Math.Min(bytes.Length - (int)Position, count);

+                    Array.Copy(bytes, (int)Position, buffer, offset, numBytesToCopy);

+                    numBytesCopiedTotal += numBytesToCopy;

+                    offset += numBytesToCopy;

+                    count -= numBytesCopiedTotal;

+                    Position += numBytesToCopy;

+                    if (Position >= bytes.Length)

+                    {

+                        Position = 0;

+                        index++;

+                    }

+                }

+                return numBytesCopiedTotal;

+            }

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs b/csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
index 48bf6d60..98cabd55 100644
--- a/csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
+++ b/csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs
@@ -334,7 +334,7 @@ namespace Google.Protobuf
             }

             // Now test Input stream:

             {

-                CodedInputStream cin = new CodedInputStream(new MemoryStream(bytes), new byte[50], 0, 0);

+                CodedInputStream cin = new CodedInputStream(new MemoryStream(bytes), new byte[50], 0, 0, false);

                 Assert.AreEqual(0, cin.Position);

                 // Field 1:

                 uint tag = cin.ReadTag();

@@ -415,5 +415,12 @@ namespace Google.Protobuf
             Assert.AreEqual(1, memoryStream.Position); // Flushed data from CodedOutputStream to MemoryStream

             Assert.IsTrue(memoryStream.CanWrite); // We left the stream open

         }

+

+        [Test]

+        public void Dispose_FromByteArray()

+        {

+            var stream = new CodedOutputStream(new byte[10]);

+            stream.Dispose();

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs b/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
index 9d3d69af..8791dffc 100644
--- a/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
@@ -540,6 +540,65 @@ namespace Google.Protobuf.Collections
             Assert.Throws<ArgumentException>(() => map.ToString());
         }
 
+        [Test]
+        public void NaNValuesComparedBitwise()
+        {
+            var map1 = new MapField<string, double>
+            {
+                { "x", SampleNaNs.Regular },
+                { "y", SampleNaNs.SignallingFlipped }
+            };
+
+            var map2 = new MapField<string, double>
+            {
+                { "x", SampleNaNs.Regular },
+                { "y", SampleNaNs.PayloadFlipped }
+            };
+
+            var map3 = new MapField<string, double>
+            {
+                { "x", SampleNaNs.Regular },
+                { "y", SampleNaNs.SignallingFlipped }
+            };
+
+            EqualityTester.AssertInequality(map1, map2);
+            EqualityTester.AssertEquality(map1, map3);
+            Assert.True(map1.Values.Contains(SampleNaNs.SignallingFlipped));
+            Assert.False(map2.Values.Contains(SampleNaNs.SignallingFlipped));
+        }
+
+        // This wouldn't usually happen, as protos can't use doubles as map keys,
+        // but let's be consistent.
+        [Test]
+        public void NaNKeysComparedBitwise()
+        {
+            var map = new MapField<double, string>
+            {
+                { SampleNaNs.Regular, "x" },
+                { SampleNaNs.SignallingFlipped, "y" }
+            };
+            Assert.AreEqual("x", map[SampleNaNs.Regular]);
+            Assert.AreEqual("y", map[SampleNaNs.SignallingFlipped]);
+            string ignored;
+            Assert.False(map.TryGetValue(SampleNaNs.PayloadFlipped, out ignored));
+        }
+
+#if !NET35
+        [Test]
+        public void IDictionaryKeys_Equals_IReadOnlyDictionaryKeys()
+        {
+            var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
+            CollectionAssert.AreEquivalent(((IDictionary<string, string>)map).Keys, ((IReadOnlyDictionary<string, string>)map).Keys);
+        }
+
+        [Test]
+        public void IDictionaryValues_Equals_IReadOnlyDictionaryValues()
+        {
+            var map = new MapField<string, string> { { "foo", "bar" }, { "x", "y" } };
+            CollectionAssert.AreEquivalent(((IDictionary<string, string>)map).Values, ((IReadOnlyDictionary<string, string>)map).Values);
+        }
+#endif
+
         private static KeyValuePair<TKey, TValue> NewKeyValuePair<TKey, TValue>(TKey key, TValue value)
         {
             return new KeyValuePair<TKey, TValue>(key, value);
diff --git a/csharp/src/Google.Protobuf.Test/Collections/ProtobufEqualityComparersTest.cs b/csharp/src/Google.Protobuf.Test/Collections/ProtobufEqualityComparersTest.cs
new file mode 100644
index 00000000..c76d7ca1
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/Collections/ProtobufEqualityComparersTest.cs
@@ -0,0 +1,124 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using NUnit.Framework;
+using System.Collections.Generic;
+using System.Linq;
+using static Google.Protobuf.Collections.ProtobufEqualityComparers;
+
+namespace Google.Protobuf.Collections
+{
+    public class ProtobufEqualityComparersTest
+    {
+        private static readonly double[] doubles =
+        {
+            0,
+            1,
+            1.5,
+            -1.5,
+            double.PositiveInfinity,
+            double.NegativeInfinity,
+            // Three different types of NaN...
+            SampleNaNs.Regular,
+            SampleNaNs.SignallingFlipped,
+            SampleNaNs.PayloadFlipped
+        };
+
+        [Test]
+        public void GetEqualityComparer_Default()
+        {
+            // It's more pain than it's worth to try to parameterize these tests.
+            Assert.AreSame(EqualityComparer<object>.Default, GetEqualityComparer<object>());
+            Assert.AreSame(EqualityComparer<string>.Default, GetEqualityComparer<string>());
+            Assert.AreSame(EqualityComparer<int>.Default, GetEqualityComparer<int>());
+            Assert.AreSame(EqualityComparer<int?>.Default, GetEqualityComparer<int?>());
+        }
+
+        [Test]
+        public void GetEqualityComparer_NotDefault()
+        {
+            // It's more pain than it's worth to try to parameterize these tests.
+            Assert.AreSame(BitwiseDoubleEqualityComparer, GetEqualityComparer<double>());
+            Assert.AreSame(BitwiseSingleEqualityComparer, GetEqualityComparer<float>());
+            Assert.AreSame(BitwiseNullableDoubleEqualityComparer, GetEqualityComparer<double?>());
+            Assert.AreSame(BitwiseNullableSingleEqualityComparer, GetEqualityComparer<float?>());
+        }
+
+        [Test]
+        public void DoubleComparisons()
+        {
+            ValidateEqualityComparer(BitwiseDoubleEqualityComparer, doubles);
+        }
+
+        [Test]
+        public void NullableDoubleComparisons()
+        {
+            ValidateEqualityComparer(BitwiseNullableDoubleEqualityComparer, doubles.Select(d => (double?) d).Concat(new double?[] { null }));
+        }
+
+        [Test]
+        public void SingleComparisons()
+        {
+            ValidateEqualityComparer(BitwiseSingleEqualityComparer, doubles.Select(d => (float) d));
+        }
+
+        [Test]
+        public void NullableSingleComparisons()
+        {
+            ValidateEqualityComparer(BitwiseNullableSingleEqualityComparer, doubles.Select(d => (float?) d).Concat(new float?[] { null }));
+        }
+
+        private static void ValidateEqualityComparer<T>(EqualityComparer<T> comparer, IEnumerable<T> values)
+        {
+            var array = values.ToArray();
+            // Each value should be equal to itself, but not to any other value.
+            for (int i = 0; i < array.Length; i++)
+            {
+                for (int j = 0; j < array.Length; j++)
+                {
+                    if (i == j)
+                    {
+                        Assert.IsTrue(comparer.Equals(array[i], array[j]),
+                            "{0} should be equal to itself", array[i], array[j]);
+                    }
+                    else
+                    {
+                        Assert.IsFalse(comparer.Equals(array[i], array[j]),
+                            "{0} and {1} should not be equal", array[i], array[j]);
+                        Assert.AreNotEqual(comparer.GetHashCode(array[i]), comparer.GetHashCode(array[j]),
+                            "Hash codes for {0} and {1} should not be equal", array[i], array[j]);
+                    }
+                }
+            }
+        }
+    }    
+}
diff --git a/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs b/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
index 6852f75f..129923b6 100644
--- a/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
@@ -742,5 +742,18 @@ namespace Google.Protobuf.Collections
             var text = list.ToString();
             Assert.AreEqual(text, "[ { \"foo\": 20 } ]", message.ToString());
         }
+
+        [Test]
+        public void NaNValuesComparedBitwise()
+        {
+            var list1 = new RepeatedField<double> { SampleNaNs.Regular, SampleNaNs.SignallingFlipped };
+            var list2 = new RepeatedField<double> { SampleNaNs.Regular, SampleNaNs.PayloadFlipped };
+            var list3 = new RepeatedField<double> { SampleNaNs.Regular, SampleNaNs.SignallingFlipped };
+
+            EqualityTester.AssertInequality(list1, list2);
+            EqualityTester.AssertEquality(list1, list3);
+            Assert.True(list1.Contains(SampleNaNs.SignallingFlipped));
+            Assert.False(list2.Contains(SampleNaNs.SignallingFlipped));
+        }
     }
 }
diff --git a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
index 8b153d69..5694754e 100644
--- a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
+++ b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
@@ -638,7 +638,7 @@ namespace Google.Protobuf
         }

 

         [Test]

-        public void IgnoreUnknownFields_RealDataStillRead()

+        public void DiscardUnknownFields_RealDataStillRead()

         {

             var message = SampleMessages.CreateFullTestAllTypes();

             var stream = new MemoryStream();

@@ -652,16 +652,18 @@ namespace Google.Protobuf
 

             stream.Position = 0;

             var parsed = TestAllTypes.Parser.ParseFrom(stream);

-            Assert.AreEqual(message, parsed);

+            // TODO(jieluo): Add test back when DiscardUnknownFields API is supported.

+            // Assert.AreEqual(message, parsed);

         }

 

         [Test]

-        public void IgnoreUnknownFields_AllTypes()

+        public void DiscardUnknownFields_AllTypes()

         {

             // Simple way of ensuring we can skip all kinds of fields.

             var data = SampleMessages.CreateFullTestAllTypes().ToByteArray();

             var empty = Empty.Parser.ParseFrom(data);

-            Assert.AreEqual(new Empty(), empty);

+            // TODO(jieluo): Add test back when DiscardUnknownFields API is supported.

+            // Assert.AreNotEqual(new Empty(), empty);

         }

 

         // This was originally seen as a conformance test failure.

@@ -719,5 +721,16 @@ namespace Google.Protobuf
             JsonFormatter.Default.Format(message, writer);

             Assert.AreEqual("{ \"c\": 31 }", writer.ToString());

         }

+

+        [Test]

+        public void NaNComparisons()

+        {

+            var message1 = new TestAllTypes { SingleDouble = SampleNaNs.Regular };

+            var message2 = new TestAllTypes { SingleDouble = SampleNaNs.PayloadFlipped };

+            var message3 = new TestAllTypes { SingleDouble = SampleNaNs.Regular };

+

+            EqualityTester.AssertInequality(message1, message2);

+            EqualityTester.AssertEquality(message1, message3);

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
new file mode 100644
index 00000000..6a430116
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
@@ -0,0 +1,30 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net451;netcoreapp1.0</TargetFrameworks>
+    <AssemblyOriginatorKeyFile>../../keys/Google.Protobuf.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
+    <IsPackable>False</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="NUnit" Version="3.9.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.9.0" />
+  </ItemGroup>
+
+  <!-- 
+    - Override target frameworks on non-Windows to just .NET Core
+    - Doing this conditionally in the initial PropertyGroup confuses
+    - Visual Studio.
+    -->
+  <PropertyGroup Condition="'$(OS)' != 'Windows_NT'">
+    <TargetFrameworks>netcoreapp1.0</TargetFrameworks>
+  </PropertyGroup>
+
+</Project>
diff --git a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
deleted file mode 100644
index 6370441e..00000000
--- a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>580eb013-d3c7-4578-b845-015f4a3b0591</ProjectGuid>
-    <RootNamespace>Google.Protobuf.Test</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <ItemGroup>
-    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
-  </ItemGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/IssuesTest.cs b/csharp/src/Google.Protobuf.Test/IssuesTest.cs
index a38d6b08..2caf80a9 100644
--- a/csharp/src/Google.Protobuf.Test/IssuesTest.cs
+++ b/csharp/src/Google.Protobuf.Test/IssuesTest.cs
@@ -33,7 +33,7 @@
 using Google.Protobuf.Reflection;

 using UnitTest.Issues.TestProtos;

 using NUnit.Framework;

-

+using static UnitTest.Issues.TestProtos.OneofMerging.Types;

 

 namespace Google.Protobuf

 {

@@ -78,5 +78,17 @@ namespace Google.Protobuf
             Assert.AreEqual("{ \"name\": \"test\", \"desc\": \"test2\", \"exid\": \"test3\" }",

                 JsonFormatter.Default.Format(message));

         }

+

+        [Test]

+        public void OneofMerging()

+        {

+            var message1 = new OneofMerging { Nested = new Nested { X = 10 } };

+            var message2 = new OneofMerging { Nested = new Nested { Y = 20 } };

+            var expected = new OneofMerging { Nested = new Nested { X = 10, Y = 20 } };

+

+            var merged = message1.Clone();

+            merged.MergeFrom(message2);

+            Assert.AreEqual(expected, merged);

+        }

     }

 }

diff --git a/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs b/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
index 3b5bf773..1c7a8cdf 100644
--- a/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
+++ b/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
@@ -52,7 +52,7 @@ namespace Google.Protobuf
         [Test]
         public void DefaultValues_WhenOmitted()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(formatDefaultValues: false));
+            var formatter = JsonFormatter.Default;
 
             AssertJson("{ }", formatter.Format(new ForeignMessage()));
             AssertJson("{ }", formatter.Format(new TestAllTypes()));
@@ -62,7 +62,7 @@ namespace Google.Protobuf
         [Test]
         public void DefaultValues_WhenIncluded()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(formatDefaultValues: true));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithFormatDefaultValues(true));
             AssertJson("{ 'c': 0 }", formatter.Format(new ForeignMessage()));
         }
 
@@ -79,6 +79,23 @@ namespace Google.Protobuf
         }
 
         [Test]
+        public void EnumAsInt()
+        {
+            var message = new TestAllTypes
+            {
+                SingleForeignEnum = ForeignEnum.ForeignBar,
+                RepeatedForeignEnum = { ForeignEnum.ForeignBaz, (ForeignEnum) 100, ForeignEnum.ForeignFoo }
+            };
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithFormatEnumsAsIntegers(true));
+            var actualText = formatter.Format(message);
+            var expectedText = "{ " +
+                               "'singleForeignEnum': 5, " +
+                               "'repeatedForeignEnum': [ 6, 100, 4 ]" +
+                               " }";
+            AssertJson(expectedText, actualText);
+        }
+
+        [Test]
         public void AllSingleFields()
         {
             var message = new TestAllTypes
@@ -266,9 +283,9 @@ namespace Google.Protobuf
             }
 
             // We should get the same result both with and without "format default values".
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false));
+            var formatter = JsonFormatter.Default;
             AssertJson(expectedJson, formatter.Format(message));
-            formatter = new JsonFormatter(new JsonFormatter.Settings(true));
+            formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithFormatDefaultValues(true));
             AssertJson(expectedJson, formatter.Format(message));
         }
 
@@ -300,7 +317,7 @@ namespace Google.Protobuf
         {
             // The actual JSON here is very large because there are lots of fields. Just test a couple of them.
             var message = new TestWellKnownTypes { Int32Field = 10 };
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(true));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithFormatDefaultValues(true));
             var actualJson = formatter.Format(message);
             Assert.IsTrue(actualJson.Contains("\"int64Field\": null"));
             Assert.IsFalse(actualJson.Contains("\"int32Field\": null"));
@@ -309,7 +326,7 @@ namespace Google.Protobuf
         [Test]
         public void OutputIsInNumericFieldOrder_NoDefaults()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false));
+            var formatter = JsonFormatter.Default;
             var message = new TestJsonFieldOrdering { PlainString = "p1", PlainInt32 = 2 };
             AssertJson("{ 'plainString': 'p1', 'plainInt32': 2 }", formatter.Format(message));
             message = new TestJsonFieldOrdering { O1Int32 = 5, O2String = "o2", PlainInt32 = 10, PlainString = "plain" };
@@ -321,7 +338,7 @@ namespace Google.Protobuf
         [Test]
         public void OutputIsInNumericFieldOrder_WithDefaults()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(true));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithFormatDefaultValues(true));
             var message = new TestJsonFieldOrdering();
             AssertJson("{ 'plainString': '', 'plainInt32': 0 }", formatter.Format(message));
             message = new TestJsonFieldOrdering { O1Int32 = 5, O2String = "o2", PlainInt32 = 10, PlainString = "plain" };
@@ -485,7 +502,7 @@ namespace Google.Protobuf
         [Test]
         public void AnyWellKnownType()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false, TypeRegistry.FromMessages(Timestamp.Descriptor)));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithTypeRegistry(TypeRegistry.FromMessages(Timestamp.Descriptor)));
             var timestamp = new DateTime(1673, 6, 19, 12, 34, 56, DateTimeKind.Utc).ToTimestamp();
             var any = Any.Pack(timestamp);
             AssertJson("{ '@type': 'type.googleapis.com/google.protobuf.Timestamp', 'value': '1673-06-19T12:34:56Z' }", formatter.Format(any));
@@ -494,32 +511,32 @@ namespace Google.Protobuf
         [Test]
         public void AnyMessageType()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false, TypeRegistry.FromMessages(TestAllTypes.Descriptor)));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithTypeRegistry(TypeRegistry.FromMessages(TestAllTypes.Descriptor)));
             var message = new TestAllTypes { SingleInt32 = 10, SingleNestedMessage = new TestAllTypes.Types.NestedMessage { Bb = 20 } };
             var any = Any.Pack(message);
-            AssertJson("{ '@type': 'type.googleapis.com/protobuf_unittest.TestAllTypes', 'singleInt32': 10, 'singleNestedMessage': { 'bb': 20 } }", formatter.Format(any));
+            AssertJson("{ '@type': 'type.googleapis.com/protobuf_unittest3.TestAllTypes', 'singleInt32': 10, 'singleNestedMessage': { 'bb': 20 } }", formatter.Format(any));
         }
 
         [Test]
         public void AnyMessageType_CustomPrefix()
         {
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false, TypeRegistry.FromMessages(TestAllTypes.Descriptor)));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithTypeRegistry(TypeRegistry.FromMessages(TestAllTypes.Descriptor)));
             var message = new TestAllTypes { SingleInt32 = 10 };
             var any = Any.Pack(message, "foo.bar/baz");
-            AssertJson("{ '@type': 'foo.bar/baz/protobuf_unittest.TestAllTypes', 'singleInt32': 10 }", formatter.Format(any));
+            AssertJson("{ '@type': 'foo.bar/baz/protobuf_unittest3.TestAllTypes', 'singleInt32': 10 }", formatter.Format(any));
         }
 
         [Test]
         public void AnyNested()
         {
             var registry = TypeRegistry.FromMessages(TestWellKnownTypes.Descriptor, TestAllTypes.Descriptor);
-            var formatter = new JsonFormatter(new JsonFormatter.Settings(false, registry));
+            var formatter = new JsonFormatter(JsonFormatter.Settings.Default.WithTypeRegistry(registry));
 
             // Nest an Any as the value of an Any.
             var doubleNestedMessage = new TestAllTypes { SingleInt32 = 20 };
             var nestedMessage = Any.Pack(doubleNestedMessage);
             var message = new TestWellKnownTypes { AnyField = Any.Pack(nestedMessage) };
-            AssertJson("{ 'anyField': { '@type': 'type.googleapis.com/google.protobuf.Any', 'value': { '@type': 'type.googleapis.com/protobuf_unittest.TestAllTypes', 'singleInt32': 20 } } }",
+            AssertJson("{ 'anyField': { '@type': 'type.googleapis.com/google.protobuf.Any', 'value': { '@type': 'type.googleapis.com/protobuf_unittest3.TestAllTypes', 'singleInt32': 20 } } }",
                 formatter.Format(message));
         }
 
diff --git a/csharp/src/Google.Protobuf.Test/JsonParserTest.cs b/csharp/src/Google.Protobuf.Test/JsonParserTest.cs
index f595455a..a6cf04ab 100644
--- a/csharp/src/Google.Protobuf.Test/JsonParserTest.cs
+++ b/csharp/src/Google.Protobuf.Test/JsonParserTest.cs
@@ -696,6 +696,22 @@ namespace Google.Protobuf
         }
 
         [Test]
+        public void Value_List_WithNullElement()
+        {
+            var expected = Value.ForList(Value.ForString("x"), Value.ForNull(), Value.ForString("y"));
+            var actual = Value.Parser.ParseJson("[\"x\", null, \"y\"]");
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
+        public void StructValue_NullElement()
+        {
+            var expected = Value.ForStruct(new Struct { Fields = { { "x", Value.ForNull() } } });
+            var actual = Value.Parser.ParseJson("{ \"x\": null }");
+            Assert.AreEqual(expected, actual);
+        }
+
+        [Test]
         public void ParseListValue()
         {
             Assert.AreEqual(new ListValue { Values = { Value.ForNumber(1), Value.ForString("x") } }, ListValue.Parser.ParseJson("[1, \"x\"]"));
@@ -809,7 +825,7 @@ namespace Google.Protobuf
             var json = formatter.Format(original); // This is tested in JsonFormatterTest
             var parser = new JsonParser(new JsonParser.Settings(10, registry));
             Assert.AreEqual(original, parser.Parse<Any>(json));
-            string valueFirstJson = "{ \"singleInt32\": 10, \"singleNestedMessage\": { \"bb\": 20 }, \"@type\": \"type.googleapis.com/protobuf_unittest.TestAllTypes\" }";
+            string valueFirstJson = "{ \"singleInt32\": 10, \"singleNestedMessage\": { \"bb\": 20 }, \"@type\": \"type.googleapis.com/protobuf_unittest3.TestAllTypes\" }";
             Assert.AreEqual(original, parser.Parse<Any>(valueFirstJson));
         }
 
@@ -820,7 +836,7 @@ namespace Google.Protobuf
             var message = new TestAllTypes { SingleInt32 = 10 };
             var original = Any.Pack(message, "custom.prefix/middle-part");
             var parser = new JsonParser(new JsonParser.Settings(10, registry));
-            string json = "{ \"@type\": \"custom.prefix/middle-part/protobuf_unittest.TestAllTypes\", \"singleInt32\": 10 }";
+            string json = "{ \"@type\": \"custom.prefix/middle-part/protobuf_unittest3.TestAllTypes\", \"singleInt32\": 10 }";
             Assert.AreEqual(original, parser.Parse<Any>(json));
         }
 
@@ -926,6 +942,27 @@ namespace Google.Protobuf
             Assert.Throws<InvalidProtocolBufferException>(() => TestAllTypes.Parser.ParseJson(json));
         }
 
+        [Test]
+        public void UnknownField_NotIgnored()
+        {
+            string json = "{ \"unknownField\": 10, \"singleString\": \"x\" }";
+            Assert.Throws<InvalidProtocolBufferException>(() => TestAllTypes.Parser.ParseJson(json));
+        }
+
+        [Test]
+        [TestCase("5")]
+        [TestCase("\"text\"")]
+        [TestCase("[0, 1, 2]")]
+        [TestCase("{ \"a\": { \"b\": 10 } }")]
+        public void UnknownField_Ignored(string value)
+        {
+            var parser = new JsonParser(JsonParser.Settings.Default.WithIgnoreUnknownFields(true));
+            string json = "{ \"unknownField\": " + value + ", \"singleString\": \"x\" }";
+            var actual = parser.Parse<TestAllTypes>(json);
+            var expected = new TestAllTypes { SingleString = "x" };
+            Assert.AreEqual(expected, actual);
+        }
+
         /// <summary>
         /// Various tests use strings which have quotes round them for parsing or as the result
         /// of formatting, but without those quotes being specified in the tests (for the sake of readability).
diff --git a/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs b/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
index 527ab336..33d35036 100644
--- a/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
+++ b/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs
@@ -349,6 +349,22 @@ namespace Google.Protobuf
             Assert.AreEqual(JsonToken.EndDocument, tokenizer.Next());
             Assert.Throws<InvalidOperationException>(() => tokenizer.Next());
         }
+
+        [Test]
+        [TestCase("{ 'skip': 0, 'next': 1")]
+        [TestCase("{ 'skip': [0, 1, 2], 'next': 1")]
+        [TestCase("{ 'skip': 'x', 'next': 1")]
+        [TestCase("{ 'skip': ['x', 'y'], 'next': 1")]
+        [TestCase("{ 'skip': {'a': 0}, 'next': 1")]
+        [TestCase("{ 'skip': {'a': [0, {'b':[]}]}, 'next': 1")]
+        public void SkipValue(string json)
+        {
+            var tokenizer = JsonTokenizer.FromTextReader(new StringReader(json.Replace('\'', '"')));
+            Assert.AreEqual(JsonToken.StartObject, tokenizer.Next());
+            Assert.AreEqual("skip", tokenizer.Next().StringValue);
+            tokenizer.SkipValue();
+            Assert.AreEqual("next", tokenizer.Next().StringValue);
+        }
        
         /// <summary>
         /// Asserts that the specified JSON is tokenized into the given sequence of tokens.
diff --git a/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
index 52d5a676..29a376e0 100644
--- a/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs
@@ -48,13 +48,13 @@ namespace Google.Protobuf.Reflection
         {
             FileDescriptor file = UnittestProto3Reflection.Descriptor;
 
-            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Name);
-            Assert.AreEqual("protobuf_unittest", file.Package);
+            Assert.AreEqual("unittest_proto3.proto", file.Name);
+            Assert.AreEqual("protobuf_unittest3", file.Package);
 
             Assert.AreEqual("UnittestProto", file.Proto.Options.JavaOuterClassname);
-            Assert.AreEqual("google/protobuf/unittest_proto3.proto", file.Proto.Name);
+            Assert.AreEqual("unittest_proto3.proto", file.Proto.Name);
 
-            // unittest.proto doesn't have any public imports, but unittest_import.proto does.
+            // unittest_proto3.proto doesn't have any public imports, but unittest_import_proto3.proto does.
             Assert.AreEqual(0, file.PublicDependencies.Count);
             Assert.AreEqual(1, UnittestImportProto3Reflection.Descriptor.PublicDependencies.Count);
             Assert.AreEqual(UnittestImportPublicProto3Reflection.Descriptor, UnittestImportProto3Reflection.Descriptor.PublicDependencies[0]);
@@ -68,7 +68,7 @@ namespace Google.Protobuf.Reflection
             Assert.AreEqual(messageType, file.MessageTypes[0]);
             Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
             Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
-            Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest.TestAllTypes"));
+            Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest3.TestAllTypes"));
             for (int i = 0; i < file.MessageTypes.Count; i++)
             {
                 Assert.AreEqual(i, file.MessageTypes[i].Index);
@@ -76,7 +76,7 @@ namespace Google.Protobuf.Reflection
 
             Assert.AreEqual(file.EnumTypes[0], file.FindTypeByName<EnumDescriptor>("ForeignEnum"));
             Assert.Null(file.FindTypeByName<EnumDescriptor>("NoSuchType"));
-            Assert.Null(file.FindTypeByName<EnumDescriptor>("protobuf_unittest.ForeignEnum"));
+            Assert.Null(file.FindTypeByName<EnumDescriptor>("protobuf_unittest3.ForeignEnum"));
             Assert.AreEqual(1, UnittestImportProto3Reflection.Descriptor.EnumTypes.Count);
             Assert.AreEqual("ImportEnum", UnittestImportProto3Reflection.Descriptor.EnumTypes[0].Name);
             for (int i = 0; i < file.EnumTypes.Count; i++)
@@ -88,13 +88,23 @@ namespace Google.Protobuf.Reflection
         }
 
         [Test]
+        public void FileDescriptor_NonRootPath()
+        {
+            // unittest_proto3.proto used to be in google/protobuf. Now it's in the C#-specific location,
+            // let's test something that's still in a directory.
+            FileDescriptor file = UnittestWellKnownTypesReflection.Descriptor;
+            Assert.AreEqual("google/protobuf/unittest_well_known_types.proto", file.Name);
+            Assert.AreEqual("protobuf_unittest", file.Package);
+        }
+
+        [Test]
         public void MessageDescriptor()
         {
             MessageDescriptor messageType = TestAllTypes.Descriptor;
             MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;
 
             Assert.AreEqual("TestAllTypes", messageType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes", messageType.FullName);
+            Assert.AreEqual("protobuf_unittest3.TestAllTypes", messageType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, messageType.File);
             Assert.IsNull(messageType.ContainingType);
             Assert.IsNull(messageType.Proto.Options);
@@ -102,7 +112,7 @@ namespace Google.Protobuf.Reflection
             Assert.AreEqual("TestAllTypes", messageType.Name);
 
             Assert.AreEqual("NestedMessage", nestedType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedMessage", nestedType.FullName);
+            Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedMessage", nestedType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
             Assert.AreEqual(messageType, nestedType.ContainingType);
 
@@ -143,7 +153,7 @@ namespace Google.Protobuf.Reflection
             FieldDescriptor messageField = messageType.FindDescriptor<FieldDescriptor>("single_foreign_message");
 
             Assert.AreEqual("single_int32", primitiveField.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.single_int32",
+            Assert.AreEqual("protobuf_unittest3.TestAllTypes.single_int32",
                             primitiveField.FullName);
             Assert.AreEqual(1, primitiveField.FieldNumber);
             Assert.AreEqual(messageType, primitiveField.ContainingType);
@@ -180,13 +190,13 @@ namespace Google.Protobuf.Reflection
             EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");
 
             Assert.AreEqual("ForeignEnum", enumType.Name);
-            Assert.AreEqual("protobuf_unittest.ForeignEnum", enumType.FullName);
+            Assert.AreEqual("protobuf_unittest3.ForeignEnum", enumType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, enumType.File);
             Assert.Null(enumType.ContainingType);
             Assert.Null(enumType.Proto.Options);
 
             Assert.AreEqual("NestedEnum", nestedType.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedEnum",
+            Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedEnum",
                             nestedType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
             Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);
@@ -209,7 +219,7 @@ namespace Google.Protobuf.Reflection
         {
             OneofDescriptor descriptor = TestAllTypes.Descriptor.FindDescriptor<OneofDescriptor>("oneof_field");
             Assert.AreEqual("oneof_field", descriptor.Name);
-            Assert.AreEqual("protobuf_unittest.TestAllTypes.oneof_field", descriptor.FullName);
+            Assert.AreEqual("protobuf_unittest3.TestAllTypes.oneof_field", descriptor.FullName);
 
             var expectedFields = new[] {
                 TestAllTypes.OneofBytesFieldNumber,
diff --git a/csharp/src/Google.Protobuf.Test/SampleNaNs.cs b/csharp/src/Google.Protobuf.Test/SampleNaNs.cs
new file mode 100644
index 00000000..08b50191
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/SampleNaNs.cs
@@ -0,0 +1,53 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+
+namespace Google.Protobuf
+{
+    /// <summary>
+    /// Samples of different not-a-number values, for testing equality comparisons.
+    /// </summary>
+    public static class SampleNaNs
+    {
+        public static double Regular { get; } = double.NaN;
+
+        // Signalling bit is inverted compared with double.NaN. Doesn't really matter
+        // whether that makes it quiet or signalling - it's different.
+        public static double SignallingFlipped { get; } = 
+            BitConverter.Int64BitsToDouble(BitConverter.DoubleToInt64Bits(double.NaN) ^ -0x8000_0000_0000_0000L);
+
+        // A bit in the middle of the mantissa is flipped; this difference is preserved when casting to float.
+        public static double PayloadFlipped { get; } =
+            BitConverter.Int64BitsToDouble(BitConverter.DoubleToInt64Bits(double.NaN) ^ 0x1_0000_0000L);
+    }
+}
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
index 9c0518a3..51715a0c 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/map_unittest_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: map_unittest_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -9,11 +11,11 @@ using pbr = global::Google.Protobuf.Reflection;
 using scg = global::System.Collections.Generic;
 namespace Google.Protobuf.TestProtos {
 
-  /// <summary>Holder for reflection information generated from google/protobuf/map_unittest_proto3.proto</summary>
+  /// <summary>Holder for reflection information generated from map_unittest_proto3.proto</summary>
   public static partial class MapUnittestProto3Reflection {
 
     #region Descriptor
-    /// <summary>File descriptor for google/protobuf/map_unittest_proto3.proto</summary>
+    /// <summary>File descriptor for map_unittest_proto3.proto</summary>
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
     }
@@ -22,130 +24,130 @@ namespace Google.Protobuf.TestProtos {
     static MapUnittestProto3Reflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "Cilnb29nbGUvcHJvdG9idWYvbWFwX3VuaXR0ZXN0X3Byb3RvMy5wcm90bxIR",
-            "cHJvdG9idWZfdW5pdHRlc3QaJWdvb2dsZS9wcm90b2J1Zi91bml0dGVzdF9w",
-            "cm90bzMucHJvdG8ilhIKB1Rlc3RNYXASRgoPbWFwX2ludDMyX2ludDMyGAEg",
-            "AygLMi0ucHJvdG9idWZfdW5pdHRlc3QuVGVzdE1hcC5NYXBJbnQzMkludDMy",
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+            "ARo6ChhNYXBTZml4ZWQzMlNmaXhlZDMyRW50cnkSCwoDa2V5GAEgASgPEg0K",
+            "BXZhbHVlGAIgASgPOgI4ARo6ChhNYXBTZml4ZWQ2NFNmaXhlZDY0RW50cnkS",
+            "CwoDa2V5GAEgASgQEg0KBXZhbHVlGAIgASgQOgI4ARo0ChJNYXBJbnQzMkZs",
+            "b2F0RW50cnkSCwoDa2V5GAEgASgFEg0KBXZhbHVlGAIgASgCOgI4ARo1ChNN",
+            "YXBJbnQzMkRvdWJsZUVudHJ5EgsKA2tleRgBIAEoBRINCgV2YWx1ZRgCIAEo",
+            "AToCOAEaMgoQTWFwQm9vbEJvb2xFbnRyeRILCgNrZXkYASABKAgSDQoFdmFs",
+            "dWUYAiABKAg6AjgBGjYKFE1hcFN0cmluZ1N0cmluZ0VudHJ5EgsKA2tleRgB",
+            "IAEoCRINCgV2YWx1ZRgCIAEoCToCOAEaNAoSTWFwSW50MzJCeXRlc0VudHJ5",
+            "EgsKA2tleRgBIAEoBRINCgV2YWx1ZRgCIAEoDDoCOAEaUAoRTWFwSW50MzJF",
+            "bnVtRW50cnkSCwoDa2V5GAEgASgFEioKBXZhbHVlGAIgASgOMhsucHJvdG9i",
+            "dWZfdW5pdHRlc3QzLk1hcEVudW06AjgBGmEKG01hcEludDMyRm9yZWlnbk1l",
+            "c3NhZ2VFbnRyeRILCgNrZXkYASABKAUSMQoFdmFsdWUYAiABKAsyIi5wcm90",
+            "b2J1Zl91bml0dGVzdDMuRm9yZWlnbk1lc3NhZ2U6AjgBIkIKEVRlc3RNYXBT",
+            "dWJtZXNzYWdlEi0KCHRlc3RfbWFwGAEgASgLMhsucHJvdG9idWZfdW5pdHRl",
+            "c3QzLlRlc3RNYXAivgEKDlRlc3RNZXNzYWdlTWFwElIKEW1hcF9pbnQzMl9t",
+            "ZXNzYWdlGAEgAygLMjcucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RNZXNzYWdl",
+            "TWFwLk1hcEludDMyTWVzc2FnZUVudHJ5GlgKFE1hcEludDMyTWVzc2FnZUVu",
+            "dHJ5EgsKA2tleRgBIAEoBRIvCgV2YWx1ZRgCIAEoCzIgLnByb3RvYnVmX3Vu",
+            "aXR0ZXN0My5UZXN0QWxsVHlwZXM6AjgBIuUBCg9UZXN0U2FtZVR5cGVNYXAS",
+            "OwoEbWFwMRgBIAMoCzItLnByb3RvYnVmX3VuaXR0ZXN0My5UZXN0U2FtZVR5",
+            "cGVNYXAuTWFwMUVudHJ5EjsKBG1hcDIYAiADKAsyLS5wcm90b2J1Zl91bml0",
+            "dGVzdDMuVGVzdFNhbWVUeXBlTWFwLk1hcDJFbnRyeRorCglNYXAxRW50cnkS",
+            "CwoDa2V5GAEgASgFEg0KBXZhbHVlGAIgASgFOgI4ARorCglNYXAyRW50cnkS",
+            "CwoDa2V5GAEgASgFEg0KBXZhbHVlGAIgASgFOgI4ASL1EAoMVGVzdEFyZW5h",
+            "TWFwEkwKD21hcF9pbnQzMl9pbnQzMhgBIAMoCzIzLnByb3RvYnVmX3VuaXR0",
+            "ZXN0My5UZXN0QXJlbmFNYXAuTWFwSW50MzJJbnQzMkVudHJ5EkwKD21hcF9p",
+            "bnQ2NF9pbnQ2NBgCIAMoCzIzLnByb3RvYnVmX3VuaXR0ZXN0My5UZXN0QXJl",
+            "bmFNYXAuTWFwSW50NjRJbnQ2NEVudHJ5ElAKEW1hcF91aW50MzJfdWludDMy",
+            "GAMgAygLMjUucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVuYU1hcC5NYXBV",
+            "aW50MzJVaW50MzJFbnRyeRJQChFtYXBfdWludDY0X3VpbnQ2NBgEIAMoCzI1",
+            "LnByb3RvYnVmX3VuaXR0ZXN0My5UZXN0QXJlbmFNYXAuTWFwVWludDY0VWlu",
+            "dDY0RW50cnkSUAoRbWFwX3NpbnQzMl9zaW50MzIYBSADKAsyNS5wcm90b2J1",
+            "Zl91bml0dGVzdDMuVGVzdEFyZW5hTWFwLk1hcFNpbnQzMlNpbnQzMkVudHJ5",
+            "ElAKEW1hcF9zaW50NjRfc2ludDY0GAYgAygLMjUucHJvdG9idWZfdW5pdHRl",
+            "c3QzLlRlc3RBcmVuYU1hcC5NYXBTaW50NjRTaW50NjRFbnRyeRJUChNtYXBf",
+            "Zml4ZWQzMl9maXhlZDMyGAcgAygLMjcucHJvdG9idWZfdW5pdHRlc3QzLlRl",
+            "c3RBcmVuYU1hcC5NYXBGaXhlZDMyRml4ZWQzMkVudHJ5ElQKE21hcF9maXhl",
+            "ZDY0X2ZpeGVkNjQYCCADKAsyNy5wcm90b2J1Zl91bml0dGVzdDMuVGVzdEFy",
+            "ZW5hTWFwLk1hcEZpeGVkNjRGaXhlZDY0RW50cnkSWAoVbWFwX3NmaXhlZDMy",
+            "X3NmaXhlZDMyGAkgAygLMjkucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVu",
+            "YU1hcC5NYXBTZml4ZWQzMlNmaXhlZDMyRW50cnkSWAoVbWFwX3NmaXhlZDY0",
+            "X3NmaXhlZDY0GAogAygLMjkucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVu",
+            "YU1hcC5NYXBTZml4ZWQ2NFNmaXhlZDY0RW50cnkSTAoPbWFwX2ludDMyX2Zs",
+            "b2F0GAsgAygLMjMucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVuYU1hcC5N",
+            "YXBJbnQzMkZsb2F0RW50cnkSTgoQbWFwX2ludDMyX2RvdWJsZRgMIAMoCzI0",
+            "LnByb3RvYnVmX3VuaXR0ZXN0My5UZXN0QXJlbmFNYXAuTWFwSW50MzJEb3Vi",
+            "bGVFbnRyeRJICg1tYXBfYm9vbF9ib29sGA0gAygLMjEucHJvdG9idWZfdW5p",
+            "dHRlc3QzLlRlc3RBcmVuYU1hcC5NYXBCb29sQm9vbEVudHJ5EkoKDm1hcF9p",
+            "bnQzMl9lbnVtGA4gAygLMjIucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVu",
+            "YU1hcC5NYXBJbnQzMkVudW1FbnRyeRJfChltYXBfaW50MzJfZm9yZWlnbl9t",
+            "ZXNzYWdlGA8gAygLMjwucHJvdG9idWZfdW5pdHRlc3QzLlRlc3RBcmVuYU1h",
+            "cC5NYXBJbnQzMkZvcmVpZ25NZXNzYWdlRW50cnkaNAoSTWFwSW50MzJJbnQz",
+            "MkVudHJ5EgsKA2tleRgBIAEoBRINCgV2YWx1ZRgCIAEoBToCOAEaNAoSTWFw",
+            "SW50NjRJbnQ2NEVudHJ5EgsKA2tleRgBIAEoAxINCgV2YWx1ZRgCIAEoAzoC",
+            "OAEaNgoUTWFwVWludDMyVWludDMyRW50cnkSCwoDa2V5GAEgASgNEg0KBXZh",
+            "bHVlGAIgASgNOgI4ARo2ChRNYXBVaW50NjRVaW50NjRFbnRyeRILCgNrZXkY",
+            "ASABKAQSDQoFdmFsdWUYAiABKAQ6AjgBGjYKFE1hcFNpbnQzMlNpbnQzMkVu",
+            "dHJ5EgsKA2tleRgBIAEoERINCgV2YWx1ZRgCIAEoEToCOAEaNgoUTWFwU2lu",
+            "dDY0U2ludDY0RW50cnkSCwoDa2V5GAEgASgSEg0KBXZhbHVlGAIgASgSOgI4",
+            "ARo4ChZNYXBGaXhlZDMyRml4ZWQzMkVudHJ5EgsKA2tleRgBIAEoBxINCgV2",
+            "YWx1ZRgCIAEoBzoCOAEaOAoWTWFwRml4ZWQ2NEZpeGVkNjRFbnRyeRILCgNr",
+            "ZXkYASABKAYSDQoFdmFsdWUYAiABKAY6AjgBGjoKGE1hcFNmaXhlZDMyU2Zp",
+            "eGVkMzJFbnRyeRILCgNrZXkYASABKA8SDQoFdmFsdWUYAiABKA86AjgBGjoK",
+            "GE1hcFNmaXhlZDY0U2ZpeGVkNjRFbnRyeRILCgNrZXkYASABKBASDQoFdmFs",
+            "dWUYAiABKBA6AjgBGjQKEk1hcEludDMyRmxvYXRFbnRyeRILCgNrZXkYASAB",
+            "KAUSDQoFdmFsdWUYAiABKAI6AjgBGjUKE01hcEludDMyRG91YmxlRW50cnkS",
+            "CwoDa2V5GAEgASgFEg0KBXZhbHVlGAIgASgBOgI4ARoyChBNYXBCb29sQm9v",
+            "bEVudHJ5EgsKA2tleRgBIAEoCBINCgV2YWx1ZRgCIAEoCDoCOAEaUAoRTWFw",
+            "SW50MzJFbnVtRW50cnkSCwoDa2V5GAEgASgFEioKBXZhbHVlGAIgASgOMhsu",
+            "cHJvdG9idWZfdW5pdHRlc3QzLk1hcEVudW06AjgBGmEKG01hcEludDMyRm9y",
+            "ZWlnbk1lc3NhZ2VFbnRyeRILCgNrZXkYASABKAUSMQoFdmFsdWUYAiABKAsy",
+            "Ii5wcm90b2J1Zl91bml0dGVzdDMuRm9yZWlnbk1lc3NhZ2U6AjgBIuYBCh9N",
+            "ZXNzYWdlQ29udGFpbmluZ0VudW1DYWxsZWRUeXBlEksKBHR5cGUYASADKAsy",
+            "PS5wcm90b2J1Zl91bml0dGVzdDMuTWVzc2FnZUNvbnRhaW5pbmdFbnVtQ2Fs",
+            "bGVkVHlwZS5UeXBlRW50cnkaYAoJVHlwZUVudHJ5EgsKA2tleRgBIAEoBRJC",
+            "CgV2YWx1ZRgCIAEoCzIzLnByb3RvYnVmX3VuaXR0ZXN0My5NZXNzYWdlQ29u",
+            "dGFpbmluZ0VudW1DYWxsZWRUeXBlOgI4ASIUCgRUeXBlEgwKCFRZUEVfRk9P",
+            "EAAingEKH01lc3NhZ2VDb250YWluaW5nTWFwQ2FsbGVkRW50cnkSTQoFZW50",
+            "cnkYASADKAsyPi5wcm90b2J1Zl91bml0dGVzdDMuTWVzc2FnZUNvbnRhaW5p",
+            "bmdNYXBDYWxsZWRFbnRyeS5FbnRyeUVudHJ5GiwKCkVudHJ5RW50cnkSCwoD",
+            "a2V5GAEgASgFEg0KBXZhbHVlGAIgASgFOgI4ASo/CgdNYXBFbnVtEhAKDE1B",
+            "UF9FTlVNX0ZPTxAAEhAKDE1BUF9FTlVNX0JBUhABEhAKDE1BUF9FTlVNX0JB",
+            "WhACQh2qAhpHb29nbGUuUHJvdG9idWYuVGVzdFByb3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestProto3Reflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.MapEnum), }, new pbr::GeneratedClrTypeInfo[] {
@@ -176,6 +178,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestMap : pb::IMessage<TestMap> {
     private static readonly pb::MessageParser<TestMap> _parser = new pb::MessageParser<TestMap>(() => new TestMap());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMap> Parser { get { return _parser; } }
 
@@ -215,6 +218,7 @@ namespace Google.Protobuf.TestProtos {
       mapInt32Bytes_ = other.mapInt32Bytes_.Clone();
       mapInt32Enum_ = other.mapInt32Enum_.Clone();
       mapInt32ForeignMessage_ = other.mapInt32ForeignMessage_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -422,7 +426,7 @@ namespace Google.Protobuf.TestProtos {
       if (!MapInt32Bytes.Equals(other.MapInt32Bytes)) return false;
       if (!MapInt32Enum.Equals(other.MapInt32Enum)) return false;
       if (!MapInt32ForeignMessage.Equals(other.MapInt32ForeignMessage)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -445,6 +449,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= MapInt32Bytes.GetHashCode();
       hash ^= MapInt32Enum.GetHashCode();
       hash ^= MapInt32ForeignMessage.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -472,6 +479,9 @@ namespace Google.Protobuf.TestProtos {
       mapInt32Bytes_.WriteTo(output, _map_mapInt32Bytes_codec);
       mapInt32Enum_.WriteTo(output, _map_mapInt32Enum_codec);
       mapInt32ForeignMessage_.WriteTo(output, _map_mapInt32ForeignMessage_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -494,6 +504,9 @@ namespace Google.Protobuf.TestProtos {
       size += mapInt32Bytes_.CalculateSize(_map_mapInt32Bytes_codec);
       size += mapInt32Enum_.CalculateSize(_map_mapInt32Enum_codec);
       size += mapInt32ForeignMessage_.CalculateSize(_map_mapInt32ForeignMessage_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -519,6 +532,7 @@ namespace Google.Protobuf.TestProtos {
       mapInt32Bytes_.Add(other.mapInt32Bytes_);
       mapInt32Enum_.Add(other.mapInt32Enum_);
       mapInt32ForeignMessage_.Add(other.mapInt32ForeignMessage_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -527,7 +541,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             mapInt32Int32_.AddEntriesFrom(input, _map_mapInt32Int32_codec);
@@ -605,6 +619,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestMapSubmessage : pb::IMessage<TestMapSubmessage> {
     private static readonly pb::MessageParser<TestMapSubmessage> _parser = new pb::MessageParser<TestMapSubmessage>(() => new TestMapSubmessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMapSubmessage> Parser { get { return _parser; } }
 
@@ -627,7 +642,8 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestMapSubmessage(TestMapSubmessage other) : this() {
-      TestMap = other.testMap_ != null ? other.TestMap.Clone() : null;
+      testMap_ = other.testMap_ != null ? other.testMap_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -660,13 +676,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!object.Equals(TestMap, other.TestMap)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (testMap_ != null) hash ^= TestMap.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -681,6 +700,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteMessage(TestMap);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -689,6 +711,9 @@ namespace Google.Protobuf.TestProtos {
       if (testMap_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(TestMap);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -703,6 +728,7 @@ namespace Google.Protobuf.TestProtos {
         }
         TestMap.MergeFrom(other.TestMap);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -711,7 +737,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (testMap_ == null) {
@@ -728,6 +754,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestMessageMap : pb::IMessage<TestMessageMap> {
     private static readonly pb::MessageParser<TestMessageMap> _parser = new pb::MessageParser<TestMessageMap>(() => new TestMessageMap());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMessageMap> Parser { get { return _parser; } }
 
@@ -751,6 +778,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestMessageMap(TestMessageMap other) : this() {
       mapInt32Message_ = other.mapInt32Message_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -782,13 +810,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!MapInt32Message.Equals(other.MapInt32Message)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= MapInt32Message.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -800,12 +831,18 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       mapInt32Message_.WriteTo(output, _map_mapInt32Message_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += mapInt32Message_.CalculateSize(_map_mapInt32Message_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -815,6 +852,7 @@ namespace Google.Protobuf.TestProtos {
         return;
       }
       mapInt32Message_.Add(other.mapInt32Message_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -823,7 +861,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             mapInt32Message_.AddEntriesFrom(input, _map_mapInt32Message_codec);
@@ -840,6 +878,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestSameTypeMap : pb::IMessage<TestSameTypeMap> {
     private static readonly pb::MessageParser<TestSameTypeMap> _parser = new pb::MessageParser<TestSameTypeMap>(() => new TestSameTypeMap());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestSameTypeMap> Parser { get { return _parser; } }
 
@@ -864,6 +903,7 @@ namespace Google.Protobuf.TestProtos {
     public TestSameTypeMap(TestSameTypeMap other) : this() {
       map1_ = other.map1_.Clone();
       map2_ = other.map2_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -906,7 +946,7 @@ namespace Google.Protobuf.TestProtos {
       }
       if (!Map1.Equals(other.Map1)) return false;
       if (!Map2.Equals(other.Map2)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -914,6 +954,9 @@ namespace Google.Protobuf.TestProtos {
       int hash = 1;
       hash ^= Map1.GetHashCode();
       hash ^= Map2.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -926,6 +969,9 @@ namespace Google.Protobuf.TestProtos {
     public void WriteTo(pb::CodedOutputStream output) {
       map1_.WriteTo(output, _map_map1_codec);
       map2_.WriteTo(output, _map_map2_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -933,6 +979,9 @@ namespace Google.Protobuf.TestProtos {
       int size = 0;
       size += map1_.CalculateSize(_map_map1_codec);
       size += map2_.CalculateSize(_map_map2_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -943,6 +992,7 @@ namespace Google.Protobuf.TestProtos {
       }
       map1_.Add(other.map1_);
       map2_.Add(other.map2_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -951,7 +1001,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             map1_.AddEntriesFrom(input, _map_map1_codec);
@@ -969,6 +1019,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestArenaMap : pb::IMessage<TestArenaMap> {
     private static readonly pb::MessageParser<TestArenaMap> _parser = new pb::MessageParser<TestArenaMap>(() => new TestArenaMap());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestArenaMap> Parser { get { return _parser; } }
 
@@ -1006,6 +1057,7 @@ namespace Google.Protobuf.TestProtos {
       mapBoolBool_ = other.mapBoolBool_.Clone();
       mapInt32Enum_ = other.mapInt32Enum_.Clone();
       mapInt32ForeignMessage_ = other.mapInt32ForeignMessage_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1191,7 +1243,7 @@ namespace Google.Protobuf.TestProtos {
       if (!MapBoolBool.Equals(other.MapBoolBool)) return false;
       if (!MapInt32Enum.Equals(other.MapInt32Enum)) return false;
       if (!MapInt32ForeignMessage.Equals(other.MapInt32ForeignMessage)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1212,6 +1264,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= MapBoolBool.GetHashCode();
       hash ^= MapInt32Enum.GetHashCode();
       hash ^= MapInt32ForeignMessage.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1237,6 +1292,9 @@ namespace Google.Protobuf.TestProtos {
       mapBoolBool_.WriteTo(output, _map_mapBoolBool_codec);
       mapInt32Enum_.WriteTo(output, _map_mapInt32Enum_codec);
       mapInt32ForeignMessage_.WriteTo(output, _map_mapInt32ForeignMessage_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1257,6 +1315,9 @@ namespace Google.Protobuf.TestProtos {
       size += mapBoolBool_.CalculateSize(_map_mapBoolBool_codec);
       size += mapInt32Enum_.CalculateSize(_map_mapInt32Enum_codec);
       size += mapInt32ForeignMessage_.CalculateSize(_map_mapInt32ForeignMessage_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1280,6 +1341,7 @@ namespace Google.Protobuf.TestProtos {
       mapBoolBool_.Add(other.mapBoolBool_);
       mapInt32Enum_.Add(other.mapInt32Enum_);
       mapInt32ForeignMessage_.Add(other.mapInt32ForeignMessage_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1288,7 +1350,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             mapInt32Int32_.AddEntriesFrom(input, _map_mapInt32Int32_codec);
@@ -1362,6 +1424,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class MessageContainingEnumCalledType : pb::IMessage<MessageContainingEnumCalledType> {
     private static readonly pb::MessageParser<MessageContainingEnumCalledType> _parser = new pb::MessageParser<MessageContainingEnumCalledType>(() => new MessageContainingEnumCalledType());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MessageContainingEnumCalledType> Parser { get { return _parser; } }
 
@@ -1385,6 +1448,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public MessageContainingEnumCalledType(MessageContainingEnumCalledType other) : this() {
       type_ = other.type_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1416,13 +1480,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!Type.Equals(other.Type)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= Type.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1434,12 +1501,18 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       type_.WriteTo(output, _map_type_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += type_.CalculateSize(_map_type_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1449,6 +1522,7 @@ namespace Google.Protobuf.TestProtos {
         return;
       }
       type_.Add(other.type_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1457,7 +1531,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             type_.AddEntriesFrom(input, _map_type_codec);
@@ -1485,6 +1559,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class MessageContainingMapCalledEntry : pb::IMessage<MessageContainingMapCalledEntry> {
     private static readonly pb::MessageParser<MessageContainingMapCalledEntry> _parser = new pb::MessageParser<MessageContainingMapCalledEntry>(() => new MessageContainingMapCalledEntry());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MessageContainingMapCalledEntry> Parser { get { return _parser; } }
 
@@ -1508,6 +1583,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public MessageContainingMapCalledEntry(MessageContainingMapCalledEntry other) : this() {
       entry_ = other.entry_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1539,13 +1615,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!Entry.Equals(other.Entry)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= Entry.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1557,12 +1636,18 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       entry_.WriteTo(output, _map_entry_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += entry_.CalculateSize(_map_entry_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1572,6 +1657,7 @@ namespace Google.Protobuf.TestProtos {
         return;
       }
       entry_.Add(other.entry_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1580,7 +1666,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             entry_.AddEntriesFrom(input, _map_entry_codec);
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/TestMessagesProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/TestMessagesProto3.cs
index fbeb512a..7353be7b 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/TestMessagesProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/TestMessagesProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/test_messages_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/test_messages_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -27,180 +29,184 @@ namespace ProtobufTestMessages.Proto3 {
             "dWYvYW55LnByb3RvGh5nb29nbGUvcHJvdG9idWYvZHVyYXRpb24ucHJvdG8a",
             "IGdvb2dsZS9wcm90b2J1Zi9maWVsZF9tYXNrLnByb3RvGhxnb29nbGUvcHJv",
             "dG9idWYvc3RydWN0LnByb3RvGh9nb29nbGUvcHJvdG9idWYvdGltZXN0YW1w",
-            "LnByb3RvGh5nb29nbGUvcHJvdG9idWYvd3JhcHBlcnMucHJvdG8i+DkKDFRl",
-            "c3RBbGxUeXBlcxIWCg5vcHRpb25hbF9pbnQzMhgBIAEoBRIWCg5vcHRpb25h",
-            "bF9pbnQ2NBgCIAEoAxIXCg9vcHRpb25hbF91aW50MzIYAyABKA0SFwoPb3B0",
-            "aW9uYWxfdWludDY0GAQgASgEEhcKD29wdGlvbmFsX3NpbnQzMhgFIAEoERIX",
-            "Cg9vcHRpb25hbF9zaW50NjQYBiABKBISGAoQb3B0aW9uYWxfZml4ZWQzMhgH",
-            "IAEoBxIYChBvcHRpb25hbF9maXhlZDY0GAggASgGEhkKEW9wdGlvbmFsX3Nm",
-            "aXhlZDMyGAkgASgPEhkKEW9wdGlvbmFsX3NmaXhlZDY0GAogASgQEhYKDm9w",
-            "dGlvbmFsX2Zsb2F0GAsgASgCEhcKD29wdGlvbmFsX2RvdWJsZRgMIAEoARIV",
-            "Cg1vcHRpb25hbF9ib29sGA0gASgIEhcKD29wdGlvbmFsX3N0cmluZxgOIAEo",
-            "CRIWCg5vcHRpb25hbF9ieXRlcxgPIAEoDBJaChdvcHRpb25hbF9uZXN0ZWRf",
-            "bWVzc2FnZRgSIAEoCzI5LnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8z",
-            "LlRlc3RBbGxUeXBlcy5OZXN0ZWRNZXNzYWdlEk8KGG9wdGlvbmFsX2ZvcmVp",
-            "Z25fbWVzc2FnZRgTIAEoCzItLnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJv",
-            "dG8zLkZvcmVpZ25NZXNzYWdlElQKFG9wdGlvbmFsX25lc3RlZF9lbnVtGBUg",
-            "ASgOMjYucHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5",
-            "cGVzLk5lc3RlZEVudW0SSQoVb3B0aW9uYWxfZm9yZWlnbl9lbnVtGBYgASgO",
-            "MioucHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuRm9yZWlnbkVudW0S",
-            "IQoVb3B0aW9uYWxfc3RyaW5nX3BpZWNlGBggASgJQgIIAhIZCg1vcHRpb25h",
-            "bF9jb3JkGBkgASgJQgIIARJGChFyZWN1cnNpdmVfbWVzc2FnZRgbIAEoCzIr",
-            "LnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcxIW",
-            "Cg5yZXBlYXRlZF9pbnQzMhgfIAMoBRIWCg5yZXBlYXRlZF9pbnQ2NBggIAMo",
-            "AxIXCg9yZXBlYXRlZF91aW50MzIYISADKA0SFwoPcmVwZWF0ZWRfdWludDY0",
-            "GCIgAygEEhcKD3JlcGVhdGVkX3NpbnQzMhgjIAMoERIXCg9yZXBlYXRlZF9z",
-            "aW50NjQYJCADKBISGAoQcmVwZWF0ZWRfZml4ZWQzMhglIAMoBxIYChByZXBl",
-            "YXRlZF9maXhlZDY0GCYgAygGEhkKEXJlcGVhdGVkX3NmaXhlZDMyGCcgAygP",
-            "EhkKEXJlcGVhdGVkX3NmaXhlZDY0GCggAygQEhYKDnJlcGVhdGVkX2Zsb2F0",
-            "GCkgAygCEhcKD3JlcGVhdGVkX2RvdWJsZRgqIAMoARIVCg1yZXBlYXRlZF9i",
-            "b29sGCsgAygIEhcKD3JlcGVhdGVkX3N0cmluZxgsIAMoCRIWCg5yZXBlYXRl",
-            "ZF9ieXRlcxgtIAMoDBJaChdyZXBlYXRlZF9uZXN0ZWRfbWVzc2FnZRgwIAMo",
-            "CzI5LnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBl",
-            "cy5OZXN0ZWRNZXNzYWdlEk8KGHJlcGVhdGVkX2ZvcmVpZ25fbWVzc2FnZRgx",
-            "IAMoCzItLnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zLkZvcmVpZ25N",
-            "ZXNzYWdlElQKFHJlcGVhdGVkX25lc3RlZF9lbnVtGDMgAygOMjYucHJvdG9i",
-            "dWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk5lc3RlZEVu",
-            "dW0SSQoVcmVwZWF0ZWRfZm9yZWlnbl9lbnVtGDQgAygOMioucHJvdG9idWZf",
-            "dGVzdF9tZXNzYWdlcy5wcm90bzMuRm9yZWlnbkVudW0SIQoVcmVwZWF0ZWRf",
-            "c3RyaW5nX3BpZWNlGDYgAygJQgIIAhIZCg1yZXBlYXRlZF9jb3JkGDcgAygJ",
-            "QgIIARJXCg9tYXBfaW50MzJfaW50MzIYOCADKAsyPi5wcm90b2J1Zl90ZXN0",
-            "X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwSW50MzJJbnQzMkVu",
-            "dHJ5ElcKD21hcF9pbnQ2NF9pbnQ2NBg5IAMoCzI+LnByb3RvYnVmX3Rlc3Rf",
-            "bWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcy5NYXBJbnQ2NEludDY0RW50",
-            "cnkSWwoRbWFwX3VpbnQzMl91aW50MzIYOiADKAsyQC5wcm90b2J1Zl90ZXN0",
-            "X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwVWludDMyVWludDMy",
-            "RW50cnkSWwoRbWFwX3VpbnQ2NF91aW50NjQYOyADKAsyQC5wcm90b2J1Zl90",
-            "ZXN0X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwVWludDY0VWlu",
-            "dDY0RW50cnkSWwoRbWFwX3NpbnQzMl9zaW50MzIYPCADKAsyQC5wcm90b2J1",
-            "Zl90ZXN0X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwU2ludDMy",
-            "U2ludDMyRW50cnkSWwoRbWFwX3NpbnQ2NF9zaW50NjQYPSADKAsyQC5wcm90",
-            "b2J1Zl90ZXN0X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwU2lu",
-            "dDY0U2ludDY0RW50cnkSXwoTbWFwX2ZpeGVkMzJfZml4ZWQzMhg+IAMoCzJC",
-            "LnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcy5N",
-            "YXBGaXhlZDMyRml4ZWQzMkVudHJ5El8KE21hcF9maXhlZDY0X2ZpeGVkNjQY",
-            "PyADKAsyQi5wcm90b2J1Zl90ZXN0X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxs",
-            "VHlwZXMuTWFwRml4ZWQ2NEZpeGVkNjRFbnRyeRJjChVtYXBfc2ZpeGVkMzJf",
-            "c2ZpeGVkMzIYQCADKAsyRC5wcm90b2J1Zl90ZXN0X21lc3NhZ2VzLnByb3Rv",
-            "My5UZXN0QWxsVHlwZXMuTWFwU2ZpeGVkMzJTZml4ZWQzMkVudHJ5EmMKFW1h",
-            "cF9zZml4ZWQ2NF9zZml4ZWQ2NBhBIAMoCzJELnByb3RvYnVmX3Rlc3RfbWVz",
-            "c2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcy5NYXBTZml4ZWQ2NFNmaXhlZDY0",
-            "RW50cnkSVwoPbWFwX2ludDMyX2Zsb2F0GEIgAygLMj4ucHJvdG9idWZfdGVz",
-            "dF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk1hcEludDMyRmxvYXRF",
-            "bnRyeRJZChBtYXBfaW50MzJfZG91YmxlGEMgAygLMj8ucHJvdG9idWZfdGVz",
-            "dF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk1hcEludDMyRG91Ymxl",
-            "RW50cnkSUwoNbWFwX2Jvb2xfYm9vbBhEIAMoCzI8LnByb3RvYnVmX3Rlc3Rf",
-            "bWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcy5NYXBCb29sQm9vbEVudHJ5",
-            "ElsKEW1hcF9zdHJpbmdfc3RyaW5nGEUgAygLMkAucHJvdG9idWZfdGVzdF9t",
-            "ZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk1hcFN0cmluZ1N0cmluZ0Vu",
-            "dHJ5ElkKEG1hcF9zdHJpbmdfYnl0ZXMYRiADKAsyPy5wcm90b2J1Zl90ZXN0",
-            "X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwU3RyaW5nQnl0ZXNF",
-            "bnRyeRJqChltYXBfc3RyaW5nX25lc3RlZF9tZXNzYWdlGEcgAygLMkcucHJv",
-            "dG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk1hcFN0",
-            "cmluZ05lc3RlZE1lc3NhZ2VFbnRyeRJsChptYXBfc3RyaW5nX2ZvcmVpZ25f",
-            "bWVzc2FnZRhIIAMoCzJILnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8z",
-            "LlRlc3RBbGxUeXBlcy5NYXBTdHJpbmdGb3JlaWduTWVzc2FnZUVudHJ5EmQK",
-            "Fm1hcF9zdHJpbmdfbmVzdGVkX2VudW0YSSADKAsyRC5wcm90b2J1Zl90ZXN0",
-            "X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTWFwU3RyaW5nTmVzdGVk",
-            "RW51bUVudHJ5EmYKF21hcF9zdHJpbmdfZm9yZWlnbl9lbnVtGEogAygLMkUu",
-            "cHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuVGVzdEFsbFR5cGVzLk1h",
-            "cFN0cmluZ0ZvcmVpZ25FbnVtRW50cnkSFgoMb25lb2ZfdWludDMyGG8gASgN",
-            "SAASWQoUb25lb2ZfbmVzdGVkX21lc3NhZ2UYcCABKAsyOS5wcm90b2J1Zl90",
-            "ZXN0X21lc3NhZ2VzLnByb3RvMy5UZXN0QWxsVHlwZXMuTmVzdGVkTWVzc2Fn",
-            "ZUgAEhYKDG9uZW9mX3N0cmluZxhxIAEoCUgAEhUKC29uZW9mX2J5dGVzGHIg",
-            "ASgMSAASFAoKb25lb2ZfYm9vbBhzIAEoCEgAEhYKDG9uZW9mX3VpbnQ2NBh0",
-            "IAEoBEgAEhUKC29uZW9mX2Zsb2F0GHUgASgCSAASFgoMb25lb2ZfZG91Ymxl",
-            "GHYgASgBSAASTAoKb25lb2ZfZW51bRh3IAEoDjI2LnByb3RvYnVmX3Rlc3Rf",
-            "bWVzc2FnZXMucHJvdG8zLlRlc3RBbGxUeXBlcy5OZXN0ZWRFbnVtSAASOgoV",
-            "b3B0aW9uYWxfYm9vbF93cmFwcGVyGMkBIAEoCzIaLmdvb2dsZS5wcm90b2J1",
-            "Zi5Cb29sVmFsdWUSPAoWb3B0aW9uYWxfaW50MzJfd3JhcHBlchjKASABKAsy",
-            "Gy5nb29nbGUucHJvdG9idWYuSW50MzJWYWx1ZRI8ChZvcHRpb25hbF9pbnQ2",
-            "NF93cmFwcGVyGMsBIAEoCzIbLmdvb2dsZS5wcm90b2J1Zi5JbnQ2NFZhbHVl",
-            "Ej4KF29wdGlvbmFsX3VpbnQzMl93cmFwcGVyGMwBIAEoCzIcLmdvb2dsZS5w",
-            "cm90b2J1Zi5VSW50MzJWYWx1ZRI+ChdvcHRpb25hbF91aW50NjRfd3JhcHBl",
-            "chjNASABKAsyHC5nb29nbGUucHJvdG9idWYuVUludDY0VmFsdWUSPAoWb3B0",
-            "aW9uYWxfZmxvYXRfd3JhcHBlchjOASABKAsyGy5nb29nbGUucHJvdG9idWYu",
-            "RmxvYXRWYWx1ZRI+ChdvcHRpb25hbF9kb3VibGVfd3JhcHBlchjPASABKAsy",
-            "HC5nb29nbGUucHJvdG9idWYuRG91YmxlVmFsdWUSPgoXb3B0aW9uYWxfc3Ry",
-            "aW5nX3dyYXBwZXIY0AEgASgLMhwuZ29vZ2xlLnByb3RvYnVmLlN0cmluZ1Zh",
-            "bHVlEjwKFm9wdGlvbmFsX2J5dGVzX3dyYXBwZXIY0QEgASgLMhsuZ29vZ2xl",
-            "LnByb3RvYnVmLkJ5dGVzVmFsdWUSOgoVcmVwZWF0ZWRfYm9vbF93cmFwcGVy",
-            "GNMBIAMoCzIaLmdvb2dsZS5wcm90b2J1Zi5Cb29sVmFsdWUSPAoWcmVwZWF0",
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+            "c1Byb3RvMy5OZXN0ZWRNZXNzYWdlOgI4ARptChxNYXBTdHJpbmdGb3JlaWdu",
+            "TWVzc2FnZUVudHJ5EgsKA2tleRgBIAEoCRI8CgV2YWx1ZRgCIAEoCzItLnBy",
+            "b3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zLkZvcmVpZ25NZXNzYWdlOgI4",
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+            "BXZhbHVlGAIgASgOMjwucHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMu",
+            "VGVzdEFsbFR5cGVzUHJvdG8zLk5lc3RlZEVudW06AjgBGmcKGU1hcFN0cmlu",
             "Z0ZvcmVpZ25FbnVtRW50cnkSCwoDa2V5GAEgASgJEjkKBXZhbHVlGAIgASgO",
             "MioucHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzMuRm9yZWlnbkVudW06",
             "AjgBIjkKCk5lc3RlZEVudW0SBwoDRk9PEAASBwoDQkFSEAESBwoDQkFaEAIS",
-            "EAoDTkVHEP///////////wFCDQoLb25lb2ZfZmllbGQiGwoORm9yZWlnbk1l",
-            "c3NhZ2USCQoBYxgBIAEoBSpACgtGb3JlaWduRW51bRIPCgtGT1JFSUdOX0ZP",
-            "TxAAEg8KC0ZPUkVJR05fQkFSEAESDwoLRk9SRUlHTl9CQVoQAkIvCihjb20u",
-            "Z29vZ2xlLnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zSAH4AQFiBnBy",
-            "b3RvMw=="));
+            "EAoDTkVHEP///////////wFCDQoLb25lb2ZfZmllbGRKBgj1AxD/AyIbCg5G",
+            "b3JlaWduTWVzc2FnZRIJCgFjGAEgASgFKkAKC0ZvcmVpZ25FbnVtEg8KC0ZP",
+            "UkVJR05fRk9PEAASDwoLRk9SRUlHTl9CQVIQARIPCgtGT1JFSUdOX0JBWhAC",
+            "QjgKKGNvbS5nb29nbGUucHJvdG9idWZfdGVzdF9tZXNzYWdlcy5wcm90bzNI",
+            "AfgBAaICBlByb3RvM2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.AnyReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.DurationReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.FieldMaskReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.StructReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.WrappersReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::ProtobufTestMessages.Proto3.ForeignEnum), }, new pbr::GeneratedClrTypeInfo[] {
-            new pbr::GeneratedClrTypeInfo(typeof(global::ProtobufTestMessages.Proto3.TestAllTypes), global::ProtobufTestMessages.Proto3.TestAllTypes.Parser, new[]{ "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalStringPiece", "OptionalCord", "RecursiveMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedStringPiece", "RepeatedCord", "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapStringBytes", "MapStringNestedMessage", "MapStringForeignMessage", "MapStringNestedEnum", "MapStringForeignEnum", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", "OneofBool", "OneofUint64", "OneofFloat", "OneofDouble", "OneofEnum", "OptionalBoolWrapper", "OptionalInt32Wrapper", "OptionalInt64Wrapper", "OptionalUint32Wrapper", "OptionalUint64Wrapper", "OptionalFloatWrapper", "OptionalDoubleWrapper", "OptionalStringWrapper", "OptionalBytesWrapper", "RepeatedBoolWrapper", "RepeatedInt32Wrapper", "RepeatedInt64Wrapper", "RepeatedUint32Wrapper", "RepeatedUint64Wrapper", "RepeatedFloatWrapper", "RepeatedDoubleWrapper", "RepeatedStringWrapper", "RepeatedBytesWrapper", "OptionalDuration", "OptionalTimestamp", "OptionalFieldMask", "OptionalStruct", "OptionalAny", "OptionalValue", "RepeatedDuration", "RepeatedTimestamp", "RepeatedFieldmask", "RepeatedStruct", "RepeatedAny", "RepeatedValue", "Fieldname1", "FieldName2", "FieldName3", "FieldName4", "Field0Name5", "Field0Name6", "FieldName7", "FieldName8", "FieldName9", "FieldName10", "FIELDNAME11", "FIELDName12", "FieldName13", "FieldName14", "FieldName15", "FieldName16", "FieldName17", "FieldName18" }, new[]{ "OneofField" }, new[]{ typeof(global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum) }, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage), global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage.Parser, new[]{ "A", "Corecursive" }, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::ProtobufTestMessages.Proto3.TestAllTypesProto3), global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Parser, new[]{ "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalStringPiece", "OptionalCord", "RecursiveMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedStringPiece", "RepeatedCord", "MapInt32Int32", "MapInt64Int64", "MapUint32Uint32", "MapUint64Uint64", "MapSint32Sint32", "MapSint64Sint64", "MapFixed32Fixed32", "MapFixed64Fixed64", "MapSfixed32Sfixed32", "MapSfixed64Sfixed64", "MapInt32Float", "MapInt32Double", "MapBoolBool", "MapStringString", "MapStringBytes", "MapStringNestedMessage", "MapStringForeignMessage", "MapStringNestedEnum", "MapStringForeignEnum", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", "OneofBool", "OneofUint64", "OneofFloat", "OneofDouble", "OneofEnum", "OptionalBoolWrapper", "OptionalInt32Wrapper", "OptionalInt64Wrapper", "OptionalUint32Wrapper", "OptionalUint64Wrapper", "OptionalFloatWrapper", "OptionalDoubleWrapper", "OptionalStringWrapper", "OptionalBytesWrapper", "RepeatedBoolWrapper", "RepeatedInt32Wrapper", "RepeatedInt64Wrapper", "RepeatedUint32Wrapper", "RepeatedUint64Wrapper", "RepeatedFloatWrapper", "RepeatedDoubleWrapper", "RepeatedStringWrapper", "RepeatedBytesWrapper", "OptionalDuration", "OptionalTimestamp", "OptionalFieldMask", "OptionalStruct", "OptionalAny", "OptionalValue", "RepeatedDuration", "RepeatedTimestamp", "RepeatedFieldmask", "RepeatedStruct", "RepeatedAny", "RepeatedValue", "Fieldname1", "FieldName2", "FieldName3", "FieldName4", "Field0Name5", "Field0Name6", "FieldName7", "FieldName8", "FieldName9", "FieldName10", "FIELDNAME11", "FIELDName12", "FieldName13", "FieldName14", "FieldName15", "FieldName16", "FieldName17", "FieldName18" }, new[]{ "OneofField" }, new[]{ typeof(global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum) }, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage), global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage.Parser, new[]{ "A", "Corecursive" }, null, null, null),
             null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, }),
             new pbr::GeneratedClrTypeInfo(typeof(global::ProtobufTestMessages.Proto3.ForeignMessage), global::ProtobufTestMessages.Proto3.ForeignMessage.Parser, new[]{ "C" }, null, null, null)
           }));
@@ -227,10 +233,11 @@ namespace ProtobufTestMessages.Proto3 {
   /// could trigger bugs that occur in any message type in this file.  We verify
   /// this stays true in a unit test.
   /// </summary>
-  public sealed partial class TestAllTypes : pb::IMessage<TestAllTypes> {
-    private static readonly pb::MessageParser<TestAllTypes> _parser = new pb::MessageParser<TestAllTypes>(() => new TestAllTypes());
+  public sealed partial class TestAllTypesProto3 : pb::IMessage<TestAllTypesProto3> {
+    private static readonly pb::MessageParser<TestAllTypesProto3> _parser = new pb::MessageParser<TestAllTypesProto3>(() => new TestAllTypesProto3());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public static pb::MessageParser<TestAllTypes> Parser { get { return _parser; } }
+    public static pb::MessageParser<TestAllTypesProto3> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
@@ -243,14 +250,14 @@ namespace ProtobufTestMessages.Proto3 {
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public TestAllTypes() {
+    public TestAllTypesProto3() {
       OnConstruction();
     }
 
     partial void OnConstruction();
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public TestAllTypes(TestAllTypes other) : this() {
+    public TestAllTypesProto3(TestAllTypesProto3 other) : this() {
       optionalInt32_ = other.optionalInt32_;
       optionalInt64_ = other.optionalInt64_;
       optionalUint32_ = other.optionalUint32_;
@@ -266,13 +273,13 @@ namespace ProtobufTestMessages.Proto3 {
       optionalBool_ = other.optionalBool_;
       optionalString_ = other.optionalString_;
       optionalBytes_ = other.optionalBytes_;
-      OptionalNestedMessage = other.optionalNestedMessage_ != null ? other.OptionalNestedMessage.Clone() : null;
-      OptionalForeignMessage = other.optionalForeignMessage_ != null ? other.OptionalForeignMessage.Clone() : null;
+      optionalNestedMessage_ = other.optionalNestedMessage_ != null ? other.optionalNestedMessage_.Clone() : null;
+      optionalForeignMessage_ = other.optionalForeignMessage_ != null ? other.optionalForeignMessage_.Clone() : null;
       optionalNestedEnum_ = other.optionalNestedEnum_;
       optionalForeignEnum_ = other.optionalForeignEnum_;
       optionalStringPiece_ = other.optionalStringPiece_;
       optionalCord_ = other.optionalCord_;
-      RecursiveMessage = other.recursiveMessage_ != null ? other.RecursiveMessage.Clone() : null;
+      recursiveMessage_ = other.recursiveMessage_ != null ? other.recursiveMessage_.Clone() : null;
       repeatedInt32_ = other.repeatedInt32_.Clone();
       repeatedInt64_ = other.repeatedInt64_.Clone();
       repeatedUint32_ = other.repeatedUint32_.Clone();
@@ -331,12 +338,12 @@ namespace ProtobufTestMessages.Proto3 {
       repeatedDoubleWrapper_ = other.repeatedDoubleWrapper_.Clone();
       repeatedStringWrapper_ = other.repeatedStringWrapper_.Clone();
       repeatedBytesWrapper_ = other.repeatedBytesWrapper_.Clone();
-      OptionalDuration = other.optionalDuration_ != null ? other.OptionalDuration.Clone() : null;
-      OptionalTimestamp = other.optionalTimestamp_ != null ? other.OptionalTimestamp.Clone() : null;
-      OptionalFieldMask = other.optionalFieldMask_ != null ? other.OptionalFieldMask.Clone() : null;
-      OptionalStruct = other.optionalStruct_ != null ? other.OptionalStruct.Clone() : null;
-      OptionalAny = other.optionalAny_ != null ? other.OptionalAny.Clone() : null;
-      OptionalValue = other.optionalValue_ != null ? other.OptionalValue.Clone() : null;
+      optionalDuration_ = other.optionalDuration_ != null ? other.optionalDuration_.Clone() : null;
+      optionalTimestamp_ = other.optionalTimestamp_ != null ? other.optionalTimestamp_.Clone() : null;
+      optionalFieldMask_ = other.optionalFieldMask_ != null ? other.optionalFieldMask_.Clone() : null;
+      optionalStruct_ = other.optionalStruct_ != null ? other.optionalStruct_.Clone() : null;
+      optionalAny_ = other.optionalAny_ != null ? other.optionalAny_.Clone() : null;
+      optionalValue_ = other.optionalValue_ != null ? other.optionalValue_.Clone() : null;
       repeatedDuration_ = other.repeatedDuration_.Clone();
       repeatedTimestamp_ = other.repeatedTimestamp_.Clone();
       repeatedFieldmask_ = other.repeatedFieldmask_.Clone();
@@ -391,11 +398,12 @@ namespace ProtobufTestMessages.Proto3 {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public TestAllTypes Clone() {
-      return new TestAllTypes(this);
+    public TestAllTypesProto3 Clone() {
+      return new TestAllTypesProto3(this);
     }
 
     /// <summary>Field number for the "optional_int32" field.</summary>
@@ -568,9 +576,9 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "optional_nested_message" field.</summary>
     public const int OptionalNestedMessageFieldNumber = 18;
-    private global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage optionalNestedMessage_;
+    private global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage optionalNestedMessage_;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage OptionalNestedMessage {
+    public global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage OptionalNestedMessage {
       get { return optionalNestedMessage_; }
       set {
         optionalNestedMessage_ = value;
@@ -590,9 +598,9 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "optional_nested_enum" field.</summary>
     public const int OptionalNestedEnumFieldNumber = 21;
-    private global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum optionalNestedEnum_ = 0;
+    private global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum optionalNestedEnum_ = 0;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum OptionalNestedEnum {
+    public global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum OptionalNestedEnum {
       get { return optionalNestedEnum_; }
       set {
         optionalNestedEnum_ = value;
@@ -634,9 +642,9 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "recursive_message" field.</summary>
     public const int RecursiveMessageFieldNumber = 27;
-    private global::ProtobufTestMessages.Proto3.TestAllTypes recursiveMessage_;
+    private global::ProtobufTestMessages.Proto3.TestAllTypesProto3 recursiveMessage_;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public global::ProtobufTestMessages.Proto3.TestAllTypes RecursiveMessage {
+    public global::ProtobufTestMessages.Proto3.TestAllTypesProto3 RecursiveMessage {
       get { return recursiveMessage_; }
       set {
         recursiveMessage_ = value;
@@ -798,11 +806,11 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "repeated_nested_message" field.</summary>
     public const int RepeatedNestedMessageFieldNumber = 48;
-    private static readonly pb::FieldCodec<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage> _repeated_repeatedNestedMessage_codec
-        = pb::FieldCodec.ForMessage(386, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage.Parser);
-    private readonly pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage> repeatedNestedMessage_ = new pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage>();
+    private static readonly pb::FieldCodec<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage> _repeated_repeatedNestedMessage_codec
+        = pb::FieldCodec.ForMessage(386, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage.Parser);
+    private readonly pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage> repeatedNestedMessage_ = new pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage>();
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage> RepeatedNestedMessage {
+    public pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage> RepeatedNestedMessage {
       get { return repeatedNestedMessage_; }
     }
 
@@ -818,11 +826,11 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "repeated_nested_enum" field.</summary>
     public const int RepeatedNestedEnumFieldNumber = 51;
-    private static readonly pb::FieldCodec<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum> _repeated_repeatedNestedEnum_codec
-        = pb::FieldCodec.ForEnum(410, x => (int) x, x => (global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum) x);
-    private readonly pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum> repeatedNestedEnum_ = new pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum>();
+    private static readonly pb::FieldCodec<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum> _repeated_repeatedNestedEnum_codec
+        = pb::FieldCodec.ForEnum(410, x => (int) x, x => (global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum) x);
+    private readonly pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum> repeatedNestedEnum_ = new pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum>();
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum> RepeatedNestedEnum {
+    public pbc::RepeatedField<global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum> RepeatedNestedEnum {
       get { return repeatedNestedEnum_; }
     }
 
@@ -1011,11 +1019,11 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "map_string_nested_message" field.</summary>
     public const int MapStringNestedMessageFieldNumber = 71;
-    private static readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage>.Codec _map_mapStringNestedMessage_codec
-        = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForMessage(18, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage.Parser), 570);
-    private readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage> mapStringNestedMessage_ = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage>();
+    private static readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage>.Codec _map_mapStringNestedMessage_codec
+        = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForMessage(18, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage.Parser), 570);
+    private readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage> mapStringNestedMessage_ = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage>();
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage> MapStringNestedMessage {
+    public pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage> MapStringNestedMessage {
       get { return mapStringNestedMessage_; }
     }
 
@@ -1031,11 +1039,11 @@ namespace ProtobufTestMessages.Proto3 {
 
     /// <summary>Field number for the "map_string_nested_enum" field.</summary>
     public const int MapStringNestedEnumFieldNumber = 73;
-    private static readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum>.Codec _map_mapStringNestedEnum_codec
-        = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForEnum(16, x => (int) x, x => (global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum) x), 586);
-    private readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum> mapStringNestedEnum_ = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum>();
+    private static readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum>.Codec _map_mapStringNestedEnum_codec
+        = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForEnum(16, x => (int) x, x => (global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum) x), 586);
+    private readonly pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum> mapStringNestedEnum_ = new pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum>();
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum> MapStringNestedEnum {
+    public pbc::MapField<string, global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum> MapStringNestedEnum {
       get { return mapStringNestedEnum_; }
     }
 
@@ -1063,8 +1071,8 @@ namespace ProtobufTestMessages.Proto3 {
     /// <summary>Field number for the "oneof_nested_message" field.</summary>
     public const int OneofNestedMessageFieldNumber = 112;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage) oneofField_ : null; }
+    public global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage OneofNestedMessage {
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage) oneofField_ : null; }
       set {
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.OneofNestedMessage;
@@ -1140,8 +1148,8 @@ namespace ProtobufTestMessages.Proto3 {
     /// <summary>Field number for the "oneof_enum" field.</summary>
     public const int OneofEnumFieldNumber = 119;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum OneofEnum {
-      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofEnum ? (global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum) oneofField_ : 0; }
+    public global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum OneofEnum {
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofEnum ? (global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum) oneofField_ : 0; }
       set {
         oneofField_ = value;
         oneofFieldCase_ = OneofFieldOneofCase.OneofEnum;
@@ -1705,11 +1713,11 @@ namespace ProtobufTestMessages.Proto3 {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override bool Equals(object other) {
-      return Equals(other as TestAllTypes);
+      return Equals(other as TestAllTypesProto3);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public bool Equals(TestAllTypes other) {
+    public bool Equals(TestAllTypesProto3 other) {
       if (ReferenceEquals(other, null)) {
         return false;
       }
@@ -1726,8 +1734,8 @@ namespace ProtobufTestMessages.Proto3 {
       if (OptionalFixed64 != other.OptionalFixed64) return false;
       if (OptionalSfixed32 != other.OptionalSfixed32) return false;
       if (OptionalSfixed64 != other.OptionalSfixed64) return false;
-      if (OptionalFloat != other.OptionalFloat) return false;
-      if (OptionalDouble != other.OptionalDouble) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals(OptionalFloat, other.OptionalFloat)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(OptionalDouble, other.OptionalDouble)) return false;
       if (OptionalBool != other.OptionalBool) return false;
       if (OptionalString != other.OptionalString) return false;
       if (OptionalBytes != other.OptionalBytes) return false;
@@ -1784,16 +1792,16 @@ namespace ProtobufTestMessages.Proto3 {
       if (OneofBytes != other.OneofBytes) return false;
       if (OneofBool != other.OneofBool) return false;
       if (OneofUint64 != other.OneofUint64) return false;
-      if (OneofFloat != other.OneofFloat) return false;
-      if (OneofDouble != other.OneofDouble) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals(OneofFloat, other.OneofFloat)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(OneofDouble, other.OneofDouble)) return false;
       if (OneofEnum != other.OneofEnum) return false;
       if (OptionalBoolWrapper != other.OptionalBoolWrapper) return false;
       if (OptionalInt32Wrapper != other.OptionalInt32Wrapper) return false;
       if (OptionalInt64Wrapper != other.OptionalInt64Wrapper) return false;
       if (OptionalUint32Wrapper != other.OptionalUint32Wrapper) return false;
       if (OptionalUint64Wrapper != other.OptionalUint64Wrapper) return false;
-      if (OptionalFloatWrapper != other.OptionalFloatWrapper) return false;
-      if (OptionalDoubleWrapper != other.OptionalDoubleWrapper) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.Equals(OptionalFloatWrapper, other.OptionalFloatWrapper)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.Equals(OptionalDoubleWrapper, other.OptionalDoubleWrapper)) return false;
       if (OptionalStringWrapper != other.OptionalStringWrapper) return false;
       if (OptionalBytesWrapper != other.OptionalBytesWrapper) return false;
       if(!repeatedBoolWrapper_.Equals(other.repeatedBoolWrapper_)) return false;
@@ -1836,7 +1844,7 @@ namespace ProtobufTestMessages.Proto3 {
       if (FieldName17 != other.FieldName17) return false;
       if (FieldName18 != other.FieldName18) return false;
       if (OneofFieldCase != other.OneofFieldCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1852,8 +1860,8 @@ namespace ProtobufTestMessages.Proto3 {
       if (OptionalFixed64 != 0UL) hash ^= OptionalFixed64.GetHashCode();
       if (OptionalSfixed32 != 0) hash ^= OptionalSfixed32.GetHashCode();
       if (OptionalSfixed64 != 0L) hash ^= OptionalSfixed64.GetHashCode();
-      if (OptionalFloat != 0F) hash ^= OptionalFloat.GetHashCode();
-      if (OptionalDouble != 0D) hash ^= OptionalDouble.GetHashCode();
+      if (OptionalFloat != 0F) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode(OptionalFloat);
+      if (OptionalDouble != 0D) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(OptionalDouble);
       if (OptionalBool != false) hash ^= OptionalBool.GetHashCode();
       if (OptionalString.Length != 0) hash ^= OptionalString.GetHashCode();
       if (OptionalBytes.Length != 0) hash ^= OptionalBytes.GetHashCode();
@@ -1910,16 +1918,16 @@ namespace ProtobufTestMessages.Proto3 {
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) hash ^= OneofBytes.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofBool) hash ^= OneofBool.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint64) hash ^= OneofUint64.GetHashCode();
-      if (oneofFieldCase_ == OneofFieldOneofCase.OneofFloat) hash ^= OneofFloat.GetHashCode();
-      if (oneofFieldCase_ == OneofFieldOneofCase.OneofDouble) hash ^= OneofDouble.GetHashCode();
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofFloat) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode(OneofFloat);
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofDouble) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(OneofDouble);
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofEnum) hash ^= OneofEnum.GetHashCode();
       if (optionalBoolWrapper_ != null) hash ^= OptionalBoolWrapper.GetHashCode();
       if (optionalInt32Wrapper_ != null) hash ^= OptionalInt32Wrapper.GetHashCode();
       if (optionalInt64Wrapper_ != null) hash ^= OptionalInt64Wrapper.GetHashCode();
       if (optionalUint32Wrapper_ != null) hash ^= OptionalUint32Wrapper.GetHashCode();
       if (optionalUint64Wrapper_ != null) hash ^= OptionalUint64Wrapper.GetHashCode();
-      if (optionalFloatWrapper_ != null) hash ^= OptionalFloatWrapper.GetHashCode();
-      if (optionalDoubleWrapper_ != null) hash ^= OptionalDoubleWrapper.GetHashCode();
+      if (optionalFloatWrapper_ != null) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.GetHashCode(OptionalFloatWrapper);
+      if (optionalDoubleWrapper_ != null) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.GetHashCode(OptionalDoubleWrapper);
       if (optionalStringWrapper_ != null) hash ^= OptionalStringWrapper.GetHashCode();
       if (optionalBytesWrapper_ != null) hash ^= OptionalBytesWrapper.GetHashCode();
       hash ^= repeatedBoolWrapper_.GetHashCode();
@@ -1962,6 +1970,9 @@ namespace ProtobufTestMessages.Proto3 {
       if (FieldName17 != 0) hash ^= FieldName17.GetHashCode();
       if (FieldName18 != 0) hash ^= FieldName18.GetHashCode();
       hash ^= (int) oneofFieldCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2274,6 +2285,9 @@ namespace ProtobufTestMessages.Proto3 {
         output.WriteRawTag(144, 26);
         output.WriteInt32(FieldName18);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2526,11 +2540,14 @@ namespace ProtobufTestMessages.Proto3 {
       if (FieldName18 != 0) {
         size += 2 + pb::CodedOutputStream.ComputeInt32Size(FieldName18);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-    public void MergeFrom(TestAllTypes other) {
+    public void MergeFrom(TestAllTypesProto3 other) {
       if (other == null) {
         return;
       }
@@ -2581,7 +2598,7 @@ namespace ProtobufTestMessages.Proto3 {
       }
       if (other.optionalNestedMessage_ != null) {
         if (optionalNestedMessage_ == null) {
-          optionalNestedMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage();
+          optionalNestedMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage();
         }
         OptionalNestedMessage.MergeFrom(other.OptionalNestedMessage);
       }
@@ -2605,7 +2622,7 @@ namespace ProtobufTestMessages.Proto3 {
       }
       if (other.recursiveMessage_ != null) {
         if (recursiveMessage_ == null) {
-          recursiveMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypes();
+          recursiveMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3();
         }
         RecursiveMessage.MergeFrom(other.RecursiveMessage);
       }
@@ -2804,7 +2821,10 @@ namespace ProtobufTestMessages.Proto3 {
           OneofUint32 = other.OneofUint32;
           break;
         case OneofFieldOneofCase.OneofNestedMessage:
-          OneofNestedMessage = other.OneofNestedMessage;
+          if (OneofNestedMessage == null) {
+            OneofNestedMessage = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage();
+          }
+          OneofNestedMessage.MergeFrom(other.OneofNestedMessage);
           break;
         case OneofFieldOneofCase.OneofString:
           OneofString = other.OneofString;
@@ -2829,6 +2849,7 @@ namespace ProtobufTestMessages.Proto3 {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2837,7 +2858,7 @@ namespace ProtobufTestMessages.Proto3 {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             OptionalInt32 = input.ReadInt32();
@@ -2901,7 +2922,7 @@ namespace ProtobufTestMessages.Proto3 {
           }
           case 146: {
             if (optionalNestedMessage_ == null) {
-              optionalNestedMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage();
+              optionalNestedMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage();
             }
             input.ReadMessage(optionalNestedMessage_);
             break;
@@ -2914,7 +2935,7 @@ namespace ProtobufTestMessages.Proto3 {
             break;
           }
           case 168: {
-            optionalNestedEnum_ = (global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedEnum) input.ReadEnum();
+            optionalNestedEnum_ = (global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedEnum) input.ReadEnum();
             break;
           }
           case 176: {
@@ -2931,7 +2952,7 @@ namespace ProtobufTestMessages.Proto3 {
           }
           case 218: {
             if (recursiveMessage_ == null) {
-              recursiveMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypes();
+              recursiveMessage_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3();
             }
             input.ReadMessage(recursiveMessage_);
             break;
@@ -3116,7 +3137,7 @@ namespace ProtobufTestMessages.Proto3 {
             break;
           }
           case 898: {
-            global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage subBuilder = new global::ProtobufTestMessages.Proto3.TestAllTypes.Types.NestedMessage();
+            global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage subBuilder = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Types.NestedMessage();
             if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
               subBuilder.MergeFrom(OneofNestedMessage);
             }
@@ -3395,7 +3416,7 @@ namespace ProtobufTestMessages.Proto3 {
     }
 
     #region Nested types
-    /// <summary>Container for nested types declared in the TestAllTypes message type.</summary>
+    /// <summary>Container for nested types declared in the TestAllTypesProto3 message type.</summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static partial class Types {
       public enum NestedEnum {
@@ -3410,12 +3431,13 @@ namespace ProtobufTestMessages.Proto3 {
 
       public sealed partial class NestedMessage : pb::IMessage<NestedMessage> {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pbr::MessageDescriptor Descriptor {
-          get { return global::ProtobufTestMessages.Proto3.TestAllTypes.Descriptor.NestedTypes[0]; }
+          get { return global::ProtobufTestMessages.Proto3.TestAllTypesProto3.Descriptor.NestedTypes[0]; }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3433,7 +3455,8 @@ namespace ProtobufTestMessages.Proto3 {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public NestedMessage(NestedMessage other) : this() {
           a_ = other.a_;
-          Corecursive = other.corecursive_ != null ? other.Corecursive.Clone() : null;
+          corecursive_ = other.corecursive_ != null ? other.corecursive_.Clone() : null;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3454,9 +3477,9 @@ namespace ProtobufTestMessages.Proto3 {
 
         /// <summary>Field number for the "corecursive" field.</summary>
         public const int CorecursiveFieldNumber = 2;
-        private global::ProtobufTestMessages.Proto3.TestAllTypes corecursive_;
+        private global::ProtobufTestMessages.Proto3.TestAllTypesProto3 corecursive_;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public global::ProtobufTestMessages.Proto3.TestAllTypes Corecursive {
+        public global::ProtobufTestMessages.Proto3.TestAllTypesProto3 Corecursive {
           get { return corecursive_; }
           set {
             corecursive_ = value;
@@ -3478,7 +3501,7 @@ namespace ProtobufTestMessages.Proto3 {
           }
           if (A != other.A) return false;
           if (!object.Equals(Corecursive, other.Corecursive)) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3486,6 +3509,9 @@ namespace ProtobufTestMessages.Proto3 {
           int hash = 1;
           if (A != 0) hash ^= A.GetHashCode();
           if (corecursive_ != null) hash ^= Corecursive.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -3504,6 +3530,9 @@ namespace ProtobufTestMessages.Proto3 {
             output.WriteRawTag(18);
             output.WriteMessage(Corecursive);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3515,6 +3544,9 @@ namespace ProtobufTestMessages.Proto3 {
           if (corecursive_ != null) {
             size += 1 + pb::CodedOutputStream.ComputeMessageSize(Corecursive);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -3528,10 +3560,11 @@ namespace ProtobufTestMessages.Proto3 {
           }
           if (other.corecursive_ != null) {
             if (corecursive_ == null) {
-              corecursive_ = new global::ProtobufTestMessages.Proto3.TestAllTypes();
+              corecursive_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3();
             }
             Corecursive.MergeFrom(other.Corecursive);
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3540,7 +3573,7 @@ namespace ProtobufTestMessages.Proto3 {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 A = input.ReadInt32();
@@ -3548,7 +3581,7 @@ namespace ProtobufTestMessages.Proto3 {
               }
               case 18: {
                 if (corecursive_ == null) {
-                  corecursive_ = new global::ProtobufTestMessages.Proto3.TestAllTypes();
+                  corecursive_ = new global::ProtobufTestMessages.Proto3.TestAllTypesProto3();
                 }
                 input.ReadMessage(corecursive_);
                 break;
@@ -3566,6 +3599,7 @@ namespace ProtobufTestMessages.Proto3 {
 
   public sealed partial class ForeignMessage : pb::IMessage<ForeignMessage> {
     private static readonly pb::MessageParser<ForeignMessage> _parser = new pb::MessageParser<ForeignMessage>(() => new ForeignMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ForeignMessage> Parser { get { return _parser; } }
 
@@ -3589,6 +3623,7 @@ namespace ProtobufTestMessages.Proto3 {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ForeignMessage(ForeignMessage other) : this() {
       c_ = other.c_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3621,13 +3656,16 @@ namespace ProtobufTestMessages.Proto3 {
         return true;
       }
       if (C != other.C) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (C != 0) hash ^= C.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3642,6 +3680,9 @@ namespace ProtobufTestMessages.Proto3 {
         output.WriteRawTag(8);
         output.WriteInt32(C);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3650,6 +3691,9 @@ namespace ProtobufTestMessages.Proto3 {
       if (C != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(C);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3661,6 +3705,7 @@ namespace ProtobufTestMessages.Proto3 {
       if (other.C != 0) {
         C = other.C;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3669,7 +3714,7 @@ namespace ProtobufTestMessages.Proto3 {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             C = input.ReadInt32();
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestCustomOptionsProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestCustomOptionsProto3.cs
index e21ede9c..3ab5a48b 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestCustomOptionsProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestCustomOptionsProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: unittest_custom_options_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: unittest_custom_options_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -183,6 +185,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class TestMessageWithCustomOptions : pb::IMessage<TestMessageWithCustomOptions> {
     private static readonly pb::MessageParser<TestMessageWithCustomOptions> _parser = new pb::MessageParser<TestMessageWithCustomOptions>(() => new TestMessageWithCustomOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMessageWithCustomOptions> Parser { get { return _parser; } }
 
@@ -212,6 +215,7 @@ namespace UnitTest.Issues.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -275,7 +279,7 @@ namespace UnitTest.Issues.TestProtos {
       if (Field1 != other.Field1) return false;
       if (OneofField != other.OneofField) return false;
       if (AnOneofCase != other.AnOneofCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -284,6 +288,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Field1.Length != 0) hash ^= Field1.GetHashCode();
       if (anOneofCase_ == AnOneofOneofCase.OneofField) hash ^= OneofField.GetHashCode();
       hash ^= (int) anOneofCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -302,6 +309,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(16);
         output.WriteInt32(OneofField);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -313,6 +323,9 @@ namespace UnitTest.Issues.TestProtos {
       if (anOneofCase_ == AnOneofOneofCase.OneofField) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(OneofField);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -330,6 +343,7 @@ namespace UnitTest.Issues.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -338,7 +352,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Field1 = input.ReadString();
@@ -373,6 +387,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class CustomOptionFooRequest : pb::IMessage<CustomOptionFooRequest> {
     private static readonly pb::MessageParser<CustomOptionFooRequest> _parser = new pb::MessageParser<CustomOptionFooRequest>(() => new CustomOptionFooRequest());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionFooRequest> Parser { get { return _parser; } }
 
@@ -395,6 +410,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionFooRequest(CustomOptionFooRequest other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -415,12 +431,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -431,11 +450,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -444,6 +469,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -452,7 +478,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -462,6 +488,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionFooResponse : pb::IMessage<CustomOptionFooResponse> {
     private static readonly pb::MessageParser<CustomOptionFooResponse> _parser = new pb::MessageParser<CustomOptionFooResponse>(() => new CustomOptionFooResponse());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionFooResponse> Parser { get { return _parser; } }
 
@@ -484,6 +511,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionFooResponse(CustomOptionFooResponse other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -504,12 +532,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -520,11 +551,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -533,6 +570,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -541,7 +579,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -551,6 +589,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionFooClientMessage : pb::IMessage<CustomOptionFooClientMessage> {
     private static readonly pb::MessageParser<CustomOptionFooClientMessage> _parser = new pb::MessageParser<CustomOptionFooClientMessage>(() => new CustomOptionFooClientMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionFooClientMessage> Parser { get { return _parser; } }
 
@@ -573,6 +612,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionFooClientMessage(CustomOptionFooClientMessage other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -593,12 +633,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -609,11 +652,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -622,6 +671,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -630,7 +680,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -640,6 +690,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionFooServerMessage : pb::IMessage<CustomOptionFooServerMessage> {
     private static readonly pb::MessageParser<CustomOptionFooServerMessage> _parser = new pb::MessageParser<CustomOptionFooServerMessage>(() => new CustomOptionFooServerMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionFooServerMessage> Parser { get { return _parser; } }
 
@@ -662,6 +713,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionFooServerMessage(CustomOptionFooServerMessage other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -682,12 +734,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -698,11 +753,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -711,6 +772,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -719,7 +781,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -729,6 +791,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class DummyMessageContainingEnum : pb::IMessage<DummyMessageContainingEnum> {
     private static readonly pb::MessageParser<DummyMessageContainingEnum> _parser = new pb::MessageParser<DummyMessageContainingEnum>(() => new DummyMessageContainingEnum());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DummyMessageContainingEnum> Parser { get { return _parser; } }
 
@@ -751,6 +814,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public DummyMessageContainingEnum(DummyMessageContainingEnum other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -771,12 +835,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -787,11 +854,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -800,6 +873,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -808,7 +882,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -831,6 +905,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class DummyMessageInvalidAsOptionType : pb::IMessage<DummyMessageInvalidAsOptionType> {
     private static readonly pb::MessageParser<DummyMessageInvalidAsOptionType> _parser = new pb::MessageParser<DummyMessageInvalidAsOptionType>(() => new DummyMessageInvalidAsOptionType());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DummyMessageInvalidAsOptionType> Parser { get { return _parser; } }
 
@@ -853,6 +928,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public DummyMessageInvalidAsOptionType(DummyMessageInvalidAsOptionType other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -873,12 +949,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -889,11 +968,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -902,6 +987,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -910,7 +996,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -920,6 +1006,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionMinIntegerValues : pb::IMessage<CustomOptionMinIntegerValues> {
     private static readonly pb::MessageParser<CustomOptionMinIntegerValues> _parser = new pb::MessageParser<CustomOptionMinIntegerValues>(() => new CustomOptionMinIntegerValues());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionMinIntegerValues> Parser { get { return _parser; } }
 
@@ -942,6 +1029,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionMinIntegerValues(CustomOptionMinIntegerValues other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -962,12 +1050,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -978,11 +1069,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -991,6 +1088,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -999,7 +1097,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -1009,6 +1107,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionMaxIntegerValues : pb::IMessage<CustomOptionMaxIntegerValues> {
     private static readonly pb::MessageParser<CustomOptionMaxIntegerValues> _parser = new pb::MessageParser<CustomOptionMaxIntegerValues>(() => new CustomOptionMaxIntegerValues());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionMaxIntegerValues> Parser { get { return _parser; } }
 
@@ -1031,6 +1130,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionMaxIntegerValues(CustomOptionMaxIntegerValues other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1051,12 +1151,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1067,11 +1170,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1080,6 +1189,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1088,7 +1198,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -1098,6 +1208,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class CustomOptionOtherValues : pb::IMessage<CustomOptionOtherValues> {
     private static readonly pb::MessageParser<CustomOptionOtherValues> _parser = new pb::MessageParser<CustomOptionOtherValues>(() => new CustomOptionOtherValues());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<CustomOptionOtherValues> Parser { get { return _parser; } }
 
@@ -1120,6 +1231,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public CustomOptionOtherValues(CustomOptionOtherValues other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1140,12 +1252,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1156,11 +1271,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1169,6 +1290,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1177,7 +1299,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -1187,6 +1309,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class SettingRealsFromPositiveInts : pb::IMessage<SettingRealsFromPositiveInts> {
     private static readonly pb::MessageParser<SettingRealsFromPositiveInts> _parser = new pb::MessageParser<SettingRealsFromPositiveInts>(() => new SettingRealsFromPositiveInts());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<SettingRealsFromPositiveInts> Parser { get { return _parser; } }
 
@@ -1209,6 +1332,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public SettingRealsFromPositiveInts(SettingRealsFromPositiveInts other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1229,12 +1353,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1245,11 +1372,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1258,6 +1391,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1266,7 +1400,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -1276,6 +1410,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class SettingRealsFromNegativeInts : pb::IMessage<SettingRealsFromNegativeInts> {
     private static readonly pb::MessageParser<SettingRealsFromNegativeInts> _parser = new pb::MessageParser<SettingRealsFromNegativeInts>(() => new SettingRealsFromNegativeInts());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<SettingRealsFromNegativeInts> Parser { get { return _parser; } }
 
@@ -1298,6 +1433,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public SettingRealsFromNegativeInts(SettingRealsFromNegativeInts other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1318,12 +1454,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1334,11 +1473,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1347,6 +1492,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1355,7 +1501,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -1365,6 +1511,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class ComplexOptionType1 : pb::IMessage<ComplexOptionType1> {
     private static readonly pb::MessageParser<ComplexOptionType1> _parser = new pb::MessageParser<ComplexOptionType1>(() => new ComplexOptionType1());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ComplexOptionType1> Parser { get { return _parser; } }
 
@@ -1391,6 +1538,7 @@ namespace UnitTest.Issues.TestProtos {
       foo2_ = other.foo2_;
       foo3_ = other.foo3_;
       foo4_ = other.foo4_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1458,7 +1606,7 @@ namespace UnitTest.Issues.TestProtos {
       if (Foo2 != other.Foo2) return false;
       if (Foo3 != other.Foo3) return false;
       if(!foo4_.Equals(other.foo4_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1468,6 +1616,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Foo2 != 0) hash ^= Foo2.GetHashCode();
       if (Foo3 != 0) hash ^= Foo3.GetHashCode();
       hash ^= foo4_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1491,6 +1642,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteInt32(Foo3);
       }
       foo4_.WriteTo(output, _repeated_foo4_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1506,6 +1660,9 @@ namespace UnitTest.Issues.TestProtos {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Foo3);
       }
       size += foo4_.CalculateSize(_repeated_foo4_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1524,6 +1681,7 @@ namespace UnitTest.Issues.TestProtos {
         Foo3 = other.Foo3;
       }
       foo4_.Add(other.foo4_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1532,7 +1690,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Foo = input.ReadInt32();
@@ -1559,6 +1717,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class ComplexOptionType2 : pb::IMessage<ComplexOptionType2> {
     private static readonly pb::MessageParser<ComplexOptionType2> _parser = new pb::MessageParser<ComplexOptionType2>(() => new ComplexOptionType2());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ComplexOptionType2> Parser { get { return _parser; } }
 
@@ -1581,10 +1740,11 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ComplexOptionType2(ComplexOptionType2 other) : this() {
-      Bar = other.bar_ != null ? other.Bar.Clone() : null;
+      bar_ = other.bar_ != null ? other.bar_.Clone() : null;
       baz_ = other.baz_;
-      Fred = other.fred_ != null ? other.Fred.Clone() : null;
+      fred_ = other.fred_ != null ? other.fred_.Clone() : null;
       barney_ = other.barney_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1652,7 +1812,7 @@ namespace UnitTest.Issues.TestProtos {
       if (Baz != other.Baz) return false;
       if (!object.Equals(Fred, other.Fred)) return false;
       if(!barney_.Equals(other.barney_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1662,6 +1822,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Baz != 0) hash ^= Baz.GetHashCode();
       if (fred_ != null) hash ^= Fred.GetHashCode();
       hash ^= barney_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1685,6 +1848,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteMessage(Fred);
       }
       barney_.WriteTo(output, _repeated_barney_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1700,6 +1866,9 @@ namespace UnitTest.Issues.TestProtos {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Fred);
       }
       size += barney_.CalculateSize(_repeated_barney_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1724,6 +1893,7 @@ namespace UnitTest.Issues.TestProtos {
         Fred.MergeFrom(other.Fred);
       }
       barney_.Add(other.barney_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1732,7 +1902,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (bar_ == null) {
@@ -1766,6 +1936,7 @@ namespace UnitTest.Issues.TestProtos {
     public static partial class Types {
       public sealed partial class ComplexOptionType4 : pb::IMessage<ComplexOptionType4> {
         private static readonly pb::MessageParser<ComplexOptionType4> _parser = new pb::MessageParser<ComplexOptionType4>(() => new ComplexOptionType4());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<ComplexOptionType4> Parser { get { return _parser; } }
 
@@ -1789,6 +1960,7 @@ namespace UnitTest.Issues.TestProtos {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public ComplexOptionType4(ComplexOptionType4 other) : this() {
           waldo_ = other.waldo_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1821,13 +1993,16 @@ namespace UnitTest.Issues.TestProtos {
             return true;
           }
           if (Waldo != other.Waldo) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
           if (Waldo != 0) hash ^= Waldo.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -1842,6 +2017,9 @@ namespace UnitTest.Issues.TestProtos {
             output.WriteRawTag(8);
             output.WriteInt32(Waldo);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1850,6 +2028,9 @@ namespace UnitTest.Issues.TestProtos {
           if (Waldo != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(Waldo);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -1861,6 +2042,7 @@ namespace UnitTest.Issues.TestProtos {
           if (other.Waldo != 0) {
             Waldo = other.Waldo;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1869,7 +2051,7 @@ namespace UnitTest.Issues.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 Waldo = input.ReadInt32();
@@ -1888,6 +2070,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class ComplexOptionType3 : pb::IMessage<ComplexOptionType3> {
     private static readonly pb::MessageParser<ComplexOptionType3> _parser = new pb::MessageParser<ComplexOptionType3>(() => new ComplexOptionType3());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ComplexOptionType3> Parser { get { return _parser; } }
 
@@ -1911,6 +2094,7 @@ namespace UnitTest.Issues.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ComplexOptionType3(ComplexOptionType3 other) : this() {
       qux_ = other.qux_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1943,13 +2127,16 @@ namespace UnitTest.Issues.TestProtos {
         return true;
       }
       if (Qux != other.Qux) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Qux != 0) hash ^= Qux.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1964,6 +2151,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(Qux);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1972,6 +2162,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Qux != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Qux);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1983,6 +2176,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other.Qux != 0) {
         Qux = other.Qux;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1991,7 +2185,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Qux = input.ReadInt32();
@@ -2008,6 +2202,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class VariousComplexOptions : pb::IMessage<VariousComplexOptions> {
     private static readonly pb::MessageParser<VariousComplexOptions> _parser = new pb::MessageParser<VariousComplexOptions>(() => new VariousComplexOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<VariousComplexOptions> Parser { get { return _parser; } }
 
@@ -2030,6 +2225,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public VariousComplexOptions(VariousComplexOptions other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2050,12 +2246,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2066,11 +2265,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2079,6 +2284,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2087,7 +2293,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -2100,6 +2306,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class Aggregate : pb::IMessage<Aggregate> {
     private static readonly pb::MessageParser<Aggregate> _parser = new pb::MessageParser<Aggregate>(() => new Aggregate());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Aggregate> Parser { get { return _parser; } }
 
@@ -2124,7 +2331,8 @@ namespace UnitTest.Issues.TestProtos {
     public Aggregate(Aggregate other) : this() {
       i_ = other.i_;
       s_ = other.s_;
-      Sub = other.sub_ != null ? other.Sub.Clone() : null;
+      sub_ = other.sub_ != null ? other.sub_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2184,7 +2392,7 @@ namespace UnitTest.Issues.TestProtos {
       if (I != other.I) return false;
       if (S != other.S) return false;
       if (!object.Equals(Sub, other.Sub)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2193,6 +2401,9 @@ namespace UnitTest.Issues.TestProtos {
       if (I != 0) hash ^= I.GetHashCode();
       if (S.Length != 0) hash ^= S.GetHashCode();
       if (sub_ != null) hash ^= Sub.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2215,6 +2426,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(26);
         output.WriteMessage(Sub);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2229,6 +2443,9 @@ namespace UnitTest.Issues.TestProtos {
       if (sub_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Sub);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2249,6 +2466,7 @@ namespace UnitTest.Issues.TestProtos {
         }
         Sub.MergeFrom(other.Sub);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2257,7 +2475,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             I = input.ReadInt32();
@@ -2282,6 +2500,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class AggregateMessage : pb::IMessage<AggregateMessage> {
     private static readonly pb::MessageParser<AggregateMessage> _parser = new pb::MessageParser<AggregateMessage>(() => new AggregateMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<AggregateMessage> Parser { get { return _parser; } }
 
@@ -2305,6 +2524,7 @@ namespace UnitTest.Issues.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public AggregateMessage(AggregateMessage other) : this() {
       fieldname_ = other.fieldname_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2337,13 +2557,16 @@ namespace UnitTest.Issues.TestProtos {
         return true;
       }
       if (Fieldname != other.Fieldname) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Fieldname != 0) hash ^= Fieldname.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2358,6 +2581,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(Fieldname);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2366,6 +2592,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Fieldname != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Fieldname);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2377,6 +2606,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other.Fieldname != 0) {
         Fieldname = other.Fieldname;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2385,7 +2615,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Fieldname = input.ReadInt32();
@@ -2402,6 +2632,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class NestedOptionType : pb::IMessage<NestedOptionType> {
     private static readonly pb::MessageParser<NestedOptionType> _parser = new pb::MessageParser<NestedOptionType>(() => new NestedOptionType());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<NestedOptionType> Parser { get { return _parser; } }
 
@@ -2424,6 +2655,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public NestedOptionType(NestedOptionType other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2444,12 +2676,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2460,11 +2695,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2473,6 +2714,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2481,7 +2723,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -2498,6 +2740,7 @@ namespace UnitTest.Issues.TestProtos {
 
       public sealed partial class NestedMessage : pb::IMessage<NestedMessage> {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
@@ -2521,6 +2764,7 @@ namespace UnitTest.Issues.TestProtos {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public NestedMessage(NestedMessage other) : this() {
           nestedField_ = other.nestedField_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2553,13 +2797,16 @@ namespace UnitTest.Issues.TestProtos {
             return true;
           }
           if (NestedField != other.NestedField) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
           if (NestedField != 0) hash ^= NestedField.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -2574,6 +2821,9 @@ namespace UnitTest.Issues.TestProtos {
             output.WriteRawTag(8);
             output.WriteInt32(NestedField);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2582,6 +2832,9 @@ namespace UnitTest.Issues.TestProtos {
           if (NestedField != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(NestedField);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -2593,6 +2846,7 @@ namespace UnitTest.Issues.TestProtos {
           if (other.NestedField != 0) {
             NestedField = other.NestedField;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2601,7 +2855,7 @@ namespace UnitTest.Issues.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 NestedField = input.ReadInt32();
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
index f6df4e87..6bf97151 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/unittest_import_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: unittest_import_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -9,11 +11,11 @@ using pbr = global::Google.Protobuf.Reflection;
 using scg = global::System.Collections.Generic;
 namespace Google.Protobuf.TestProtos {
 
-  /// <summary>Holder for reflection information generated from google/protobuf/unittest_import_proto3.proto</summary>
+  /// <summary>Holder for reflection information generated from unittest_import_proto3.proto</summary>
   public static partial class UnittestImportProto3Reflection {
 
     #region Descriptor
-    /// <summary>File descriptor for google/protobuf/unittest_import_proto3.proto</summary>
+    /// <summary>File descriptor for unittest_import_proto3.proto</summary>
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
     }
@@ -22,14 +24,12 @@ namespace Google.Protobuf.TestProtos {
     static UnittestImportProto3Reflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "Cixnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3Byb3RvMy5wcm90",
-            "bxIYcHJvdG9idWZfdW5pdHRlc3RfaW1wb3J0GjNnb29nbGUvcHJvdG9idWYv",
-            "dW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90bzMucHJvdG8iGgoNSW1wb3J0",
-            "TWVzc2FnZRIJCgFkGAEgASgFKlkKCkltcG9ydEVudW0SGwoXSU1QT1JUX0VO",
-            "VU1fVU5TUEVDSUZJRUQQABIOCgpJTVBPUlRfRk9PEAcSDgoKSU1QT1JUX0JB",
-            "UhAIEg4KCklNUE9SVF9CQVoQCUI8Chhjb20uZ29vZ2xlLnByb3RvYnVmLnRl",
-            "c3RIAfgBAaoCGkdvb2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zUABiBnByb3Rv",
-            "Mw=="));
+            "Chx1bml0dGVzdF9pbXBvcnRfcHJvdG8zLnByb3RvEhhwcm90b2J1Zl91bml0",
+            "dGVzdF9pbXBvcnQaI3VuaXR0ZXN0X2ltcG9ydF9wdWJsaWNfcHJvdG8zLnBy",
+            "b3RvIhoKDUltcG9ydE1lc3NhZ2USCQoBZBgBIAEoBSpZCgpJbXBvcnRFbnVt",
+            "EhsKF0lNUE9SVF9FTlVNX1VOU1BFQ0lGSUVEEAASDgoKSU1QT1JUX0ZPTxAH",
+            "Eg4KCklNUE9SVF9CQVIQCBIOCgpJTVBPUlRfQkFaEAlCHaoCGkdvb2dsZS5Q",
+            "cm90b2J1Zi5UZXN0UHJvdG9zUABiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportPublicProto3Reflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.ImportEnum), }, new pbr::GeneratedClrTypeInfo[] {
@@ -52,6 +52,7 @@ namespace Google.Protobuf.TestProtos {
   #region Messages
   public sealed partial class ImportMessage : pb::IMessage<ImportMessage> {
     private static readonly pb::MessageParser<ImportMessage> _parser = new pb::MessageParser<ImportMessage>(() => new ImportMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ImportMessage> Parser { get { return _parser; } }
 
@@ -75,6 +76,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ImportMessage(ImportMessage other) : this() {
       d_ = other.d_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -107,13 +109,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (D != other.D) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (D != 0) hash ^= D.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -128,6 +133,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(D);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -136,6 +144,9 @@ namespace Google.Protobuf.TestProtos {
       if (D != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(D);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -147,6 +158,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.D != 0) {
         D = other.D;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -155,7 +167,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             D = input.ReadInt32();
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
index 67b8edf4..97d181af 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/unittest_import_public_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: unittest_import_public_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -9,11 +11,11 @@ using pbr = global::Google.Protobuf.Reflection;
 using scg = global::System.Collections.Generic;
 namespace Google.Protobuf.TestProtos {
 
-  /// <summary>Holder for reflection information generated from google/protobuf/unittest_import_public_proto3.proto</summary>
+  /// <summary>Holder for reflection information generated from unittest_import_public_proto3.proto</summary>
   public static partial class UnittestImportPublicProto3Reflection {
 
     #region Descriptor
-    /// <summary>File descriptor for google/protobuf/unittest_import_public_proto3.proto</summary>
+    /// <summary>File descriptor for unittest_import_public_proto3.proto</summary>
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
     }
@@ -22,10 +24,10 @@ namespace Google.Protobuf.TestProtos {
     static UnittestImportPublicProto3Reflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "CjNnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90",
-            "bzMucHJvdG8SGHByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydCIgChNQdWJsaWNJ",
-            "bXBvcnRNZXNzYWdlEgkKAWUYASABKAVCNwoYY29tLmdvb2dsZS5wcm90b2J1",
-            "Zi50ZXN0qgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
+            "CiN1bml0dGVzdF9pbXBvcnRfcHVibGljX3Byb3RvMy5wcm90bxIYcHJvdG9i",
+            "dWZfdW5pdHRlc3RfaW1wb3J0IiAKE1B1YmxpY0ltcG9ydE1lc3NhZ2USCQoB",
+            "ZRgBIAEoBUIdqgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3Rv",
+            "Mw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {
@@ -38,6 +40,7 @@ namespace Google.Protobuf.TestProtos {
   #region Messages
   public sealed partial class PublicImportMessage : pb::IMessage<PublicImportMessage> {
     private static readonly pb::MessageParser<PublicImportMessage> _parser = new pb::MessageParser<PublicImportMessage>(() => new PublicImportMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<PublicImportMessage> Parser { get { return _parser; } }
 
@@ -61,6 +64,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public PublicImportMessage(PublicImportMessage other) : this() {
       e_ = other.e_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -93,13 +97,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (E != other.E) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (E != 0) hash ^= E.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -114,6 +121,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(E);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -122,6 +132,9 @@ namespace Google.Protobuf.TestProtos {
       if (E != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(E);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -133,6 +146,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.E != 0) {
         E = other.E;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -141,7 +155,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             E = input.ReadInt32();
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
index 7c0ba8a6..819fc201 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: unittest_issues.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: unittest_issues.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -42,11 +44,14 @@ namespace UnitTest.Issues.TestProtos {
             "MV9pbnQzMhgFIAEoBUgAEhQKDHBsYWluX3N0cmluZxgBIAEoCRISCghvMl9p",
             "bnQzMhgGIAEoBUgBEhMKCW8yX3N0cmluZxgDIAEoCUgBQgQKAm8xQgQKAm8y",
             "IksKDFRlc3RKc29uTmFtZRIMCgRuYW1lGAEgASgJEhkKC2Rlc2NyaXB0aW9u",
-            "GAIgASgJUgRkZXNjEhIKBGd1aWQYAyABKAlSBGV4aWQqVQoMTmVnYXRpdmVF",
-            "bnVtEhYKEk5FR0FUSVZFX0VOVU1fWkVSTxAAEhYKCUZpdmVCZWxvdxD7////",
-            "//////8BEhUKCE1pbnVzT25lEP///////////wEqLgoORGVwcmVjYXRlZEVu",
-            "dW0SEwoPREVQUkVDQVRFRF9aRVJPEAASBwoDb25lEAFCH0gBqgIaVW5pdFRl",
-            "c3QuSXNzdWVzLlRlc3RQcm90b3NiBnByb3RvMw=="));
+            "GAIgASgJUgRkZXNjEhIKBGd1aWQYAyABKAlSBGV4aWQifwoMT25lb2ZNZXJn",
+            "aW5nEg4KBHRleHQYASABKAlIABI2CgZuZXN0ZWQYAiABKAsyJC51bml0dGVz",
+            "dF9pc3N1ZXMuT25lb2ZNZXJnaW5nLk5lc3RlZEgAGh4KBk5lc3RlZBIJCgF4",
+            "GAEgASgFEgkKAXkYAiABKAVCBwoFdmFsdWUqVQoMTmVnYXRpdmVFbnVtEhYK",
+            "Ek5FR0FUSVZFX0VOVU1fWkVSTxAAEhYKCUZpdmVCZWxvdxD7//////////8B",
+            "EhUKCE1pbnVzT25lEP///////////wEqLgoORGVwcmVjYXRlZEVudW0SEwoP",
+            "REVQUkVDQVRFRF9aRVJPEAASBwoDb25lEAFCHaoCGlVuaXRUZXN0Lklzc3Vl",
+            "cy5UZXN0UHJvdG9zYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::UnitTest.Issues.TestProtos.NegativeEnum), typeof(global::UnitTest.Issues.TestProtos.DeprecatedEnum), }, new pbr::GeneratedClrTypeInfo[] {
@@ -57,7 +62,8 @@ namespace UnitTest.Issues.TestProtos {
             new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.ItemField), global::UnitTest.Issues.TestProtos.ItemField.Parser, new[]{ "Item" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.ReservedNames), global::UnitTest.Issues.TestProtos.ReservedNames.Parser, new[]{ "Types_", "Descriptor_" }, null, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.ReservedNames.Types.SomeNestedType), global::UnitTest.Issues.TestProtos.ReservedNames.Types.SomeNestedType.Parser, null, null, null, null)}),
             new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.TestJsonFieldOrdering), global::UnitTest.Issues.TestProtos.TestJsonFieldOrdering.Parser, new[]{ "PlainInt32", "O1String", "O1Int32", "PlainString", "O2Int32", "O2String" }, new[]{ "O1", "O2" }, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.TestJsonName), global::UnitTest.Issues.TestProtos.TestJsonName.Parser, new[]{ "Name", "Description", "Guid" }, null, null, null)
+            new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.TestJsonName), global::UnitTest.Issues.TestProtos.TestJsonName.Parser, new[]{ "Name", "Description", "Guid" }, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.OneofMerging), global::UnitTest.Issues.TestProtos.OneofMerging.Parser, new[]{ "Text", "Nested" }, new[]{ "Value" }, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested), global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested.Parser, new[]{ "X", "Y" }, null, null, null)})
           }));
     }
     #endregion
@@ -84,6 +90,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class Issue307 : pb::IMessage<Issue307> {
     private static readonly pb::MessageParser<Issue307> _parser = new pb::MessageParser<Issue307>(() => new Issue307());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Issue307> Parser { get { return _parser; } }
 
@@ -106,6 +113,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Issue307(Issue307 other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -126,12 +134,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -142,11 +153,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -155,6 +172,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -163,7 +181,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -175,6 +193,7 @@ namespace UnitTest.Issues.TestProtos {
     public static partial class Types {
       public sealed partial class NestedOnce : pb::IMessage<NestedOnce> {
         private static readonly pb::MessageParser<NestedOnce> _parser = new pb::MessageParser<NestedOnce>(() => new NestedOnce());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NestedOnce> Parser { get { return _parser; } }
 
@@ -197,6 +216,7 @@ namespace UnitTest.Issues.TestProtos {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public NestedOnce(NestedOnce other) : this() {
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -217,12 +237,15 @@ namespace UnitTest.Issues.TestProtos {
           if (ReferenceEquals(other, this)) {
             return true;
           }
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -233,11 +256,17 @@ namespace UnitTest.Issues.TestProtos {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public void WriteTo(pb::CodedOutputStream output) {
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public int CalculateSize() {
           int size = 0;
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -246,6 +275,7 @@ namespace UnitTest.Issues.TestProtos {
           if (other == null) {
             return;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -254,7 +284,7 @@ namespace UnitTest.Issues.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
             }
           }
@@ -266,6 +296,7 @@ namespace UnitTest.Issues.TestProtos {
         public static partial class Types {
           public sealed partial class NestedTwice : pb::IMessage<NestedTwice> {
             private static readonly pb::MessageParser<NestedTwice> _parser = new pb::MessageParser<NestedTwice>(() => new NestedTwice());
+            private pb::UnknownFieldSet _unknownFields;
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
             public static pb::MessageParser<NestedTwice> Parser { get { return _parser; } }
 
@@ -288,6 +319,7 @@ namespace UnitTest.Issues.TestProtos {
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
             public NestedTwice(NestedTwice other) : this() {
+              _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
             }
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -308,12 +340,15 @@ namespace UnitTest.Issues.TestProtos {
               if (ReferenceEquals(other, this)) {
                 return true;
               }
-              return true;
+              return Equals(_unknownFields, other._unknownFields);
             }
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
             public override int GetHashCode() {
               int hash = 1;
+              if (_unknownFields != null) {
+                hash ^= _unknownFields.GetHashCode();
+              }
               return hash;
             }
 
@@ -324,11 +359,17 @@ namespace UnitTest.Issues.TestProtos {
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
             public void WriteTo(pb::CodedOutputStream output) {
+              if (_unknownFields != null) {
+                _unknownFields.WriteTo(output);
+              }
             }
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
             public int CalculateSize() {
               int size = 0;
+              if (_unknownFields != null) {
+                size += _unknownFields.CalculateSize();
+              }
               return size;
             }
 
@@ -337,6 +378,7 @@ namespace UnitTest.Issues.TestProtos {
               if (other == null) {
                 return;
               }
+              _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
             }
 
             [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -345,7 +387,7 @@ namespace UnitTest.Issues.TestProtos {
               while ((tag = input.ReadTag()) != 0) {
                 switch(tag) {
                   default:
-                    input.SkipLastField();
+                    _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                     break;
                 }
               }
@@ -365,6 +407,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class NegativeEnumMessage : pb::IMessage<NegativeEnumMessage> {
     private static readonly pb::MessageParser<NegativeEnumMessage> _parser = new pb::MessageParser<NegativeEnumMessage>(() => new NegativeEnumMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<NegativeEnumMessage> Parser { get { return _parser; } }
 
@@ -390,6 +433,7 @@ namespace UnitTest.Issues.TestProtos {
       value_ = other.value_;
       values_ = other.values_.Clone();
       packedValues_ = other.packedValues_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -444,7 +488,7 @@ namespace UnitTest.Issues.TestProtos {
       if (Value != other.Value) return false;
       if(!values_.Equals(other.values_)) return false;
       if(!packedValues_.Equals(other.packedValues_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -453,6 +497,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Value != 0) hash ^= Value.GetHashCode();
       hash ^= values_.GetHashCode();
       hash ^= packedValues_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -469,6 +516,9 @@ namespace UnitTest.Issues.TestProtos {
       }
       values_.WriteTo(output, _repeated_values_codec);
       packedValues_.WriteTo(output, _repeated_packedValues_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -479,6 +529,9 @@ namespace UnitTest.Issues.TestProtos {
       }
       size += values_.CalculateSize(_repeated_values_codec);
       size += packedValues_.CalculateSize(_repeated_packedValues_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -492,6 +545,7 @@ namespace UnitTest.Issues.TestProtos {
       }
       values_.Add(other.values_);
       packedValues_.Add(other.packedValues_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -500,7 +554,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             value_ = (global::UnitTest.Issues.TestProtos.NegativeEnum) input.ReadEnum();
@@ -524,6 +578,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class DeprecatedChild : pb::IMessage<DeprecatedChild> {
     private static readonly pb::MessageParser<DeprecatedChild> _parser = new pb::MessageParser<DeprecatedChild>(() => new DeprecatedChild());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DeprecatedChild> Parser { get { return _parser; } }
 
@@ -546,6 +601,7 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public DeprecatedChild(DeprecatedChild other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -566,12 +622,15 @@ namespace UnitTest.Issues.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -582,11 +641,17 @@ namespace UnitTest.Issues.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -595,6 +660,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -603,7 +669,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -613,6 +679,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class DeprecatedFieldsMessage : pb::IMessage<DeprecatedFieldsMessage> {
     private static readonly pb::MessageParser<DeprecatedFieldsMessage> _parser = new pb::MessageParser<DeprecatedFieldsMessage>(() => new DeprecatedFieldsMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DeprecatedFieldsMessage> Parser { get { return _parser; } }
 
@@ -637,10 +704,11 @@ namespace UnitTest.Issues.TestProtos {
     public DeprecatedFieldsMessage(DeprecatedFieldsMessage other) : this() {
       primitiveValue_ = other.primitiveValue_;
       primitiveArray_ = other.primitiveArray_.Clone();
-      MessageValue = other.messageValue_ != null ? other.MessageValue.Clone() : null;
+      messageValue_ = other.messageValue_ != null ? other.messageValue_.Clone() : null;
       messageArray_ = other.messageArray_.Clone();
       enumValue_ = other.enumValue_;
       enumArray_ = other.enumArray_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -736,7 +804,7 @@ namespace UnitTest.Issues.TestProtos {
       if(!messageArray_.Equals(other.messageArray_)) return false;
       if (EnumValue != other.EnumValue) return false;
       if(!enumArray_.Equals(other.enumArray_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -748,6 +816,9 @@ namespace UnitTest.Issues.TestProtos {
       hash ^= messageArray_.GetHashCode();
       if (EnumValue != 0) hash ^= EnumValue.GetHashCode();
       hash ^= enumArray_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -773,6 +844,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteEnum((int) EnumValue);
       }
       enumArray_.WriteTo(output, _repeated_enumArray_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -790,6 +864,9 @@ namespace UnitTest.Issues.TestProtos {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) EnumValue);
       }
       size += enumArray_.CalculateSize(_repeated_enumArray_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -813,6 +890,7 @@ namespace UnitTest.Issues.TestProtos {
         EnumValue = other.EnumValue;
       }
       enumArray_.Add(other.enumArray_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -821,7 +899,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             PrimitiveValue = input.ReadInt32();
@@ -863,6 +941,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class ItemField : pb::IMessage<ItemField> {
     private static readonly pb::MessageParser<ItemField> _parser = new pb::MessageParser<ItemField>(() => new ItemField());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ItemField> Parser { get { return _parser; } }
 
@@ -886,6 +965,7 @@ namespace UnitTest.Issues.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ItemField(ItemField other) : this() {
       item_ = other.item_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -918,13 +998,16 @@ namespace UnitTest.Issues.TestProtos {
         return true;
       }
       if (Item != other.Item) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Item != 0) hash ^= Item.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -939,6 +1022,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(Item);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -947,6 +1033,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Item != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Item);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -958,6 +1047,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other.Item != 0) {
         Item = other.Item;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -966,7 +1056,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Item = input.ReadInt32();
@@ -980,6 +1070,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class ReservedNames : pb::IMessage<ReservedNames> {
     private static readonly pb::MessageParser<ReservedNames> _parser = new pb::MessageParser<ReservedNames>(() => new ReservedNames());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ReservedNames> Parser { get { return _parser; } }
 
@@ -1004,6 +1095,7 @@ namespace UnitTest.Issues.TestProtos {
     public ReservedNames(ReservedNames other) : this() {
       types_ = other.types_;
       descriptor_ = other.descriptor_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1048,7 +1140,7 @@ namespace UnitTest.Issues.TestProtos {
       }
       if (Types_ != other.Types_) return false;
       if (Descriptor_ != other.Descriptor_) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1056,6 +1148,9 @@ namespace UnitTest.Issues.TestProtos {
       int hash = 1;
       if (Types_ != 0) hash ^= Types_.GetHashCode();
       if (Descriptor_ != 0) hash ^= Descriptor_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1074,6 +1169,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(16);
         output.WriteInt32(Descriptor_);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1085,6 +1183,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Descriptor_ != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Descriptor_);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1099,6 +1200,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other.Descriptor_ != 0) {
         Descriptor_ = other.Descriptor_;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1107,7 +1209,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Types_ = input.ReadInt32();
@@ -1130,6 +1232,7 @@ namespace UnitTest.Issues.TestProtos {
       /// </summary>
       public sealed partial class SomeNestedType : pb::IMessage<SomeNestedType> {
         private static readonly pb::MessageParser<SomeNestedType> _parser = new pb::MessageParser<SomeNestedType>(() => new SomeNestedType());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<SomeNestedType> Parser { get { return _parser; } }
 
@@ -1152,6 +1255,7 @@ namespace UnitTest.Issues.TestProtos {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public SomeNestedType(SomeNestedType other) : this() {
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1172,12 +1276,15 @@ namespace UnitTest.Issues.TestProtos {
           if (ReferenceEquals(other, this)) {
             return true;
           }
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -1188,11 +1295,17 @@ namespace UnitTest.Issues.TestProtos {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public void WriteTo(pb::CodedOutputStream output) {
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public int CalculateSize() {
           int size = 0;
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -1201,6 +1314,7 @@ namespace UnitTest.Issues.TestProtos {
           if (other == null) {
             return;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1209,7 +1323,7 @@ namespace UnitTest.Issues.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
             }
           }
@@ -1236,6 +1350,7 @@ namespace UnitTest.Issues.TestProtos {
   /// </summary>
   public sealed partial class TestJsonFieldOrdering : pb::IMessage<TestJsonFieldOrdering> {
     private static readonly pb::MessageParser<TestJsonFieldOrdering> _parser = new pb::MessageParser<TestJsonFieldOrdering>(() => new TestJsonFieldOrdering());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestJsonFieldOrdering> Parser { get { return _parser; } }
 
@@ -1278,6 +1393,7 @@ namespace UnitTest.Issues.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1410,7 +1526,7 @@ namespace UnitTest.Issues.TestProtos {
       if (O2String != other.O2String) return false;
       if (O1Case != other.O1Case) return false;
       if (O2Case != other.O2Case) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1424,6 +1540,9 @@ namespace UnitTest.Issues.TestProtos {
       if (o2Case_ == O2OneofCase.O2String) hash ^= O2String.GetHashCode();
       hash ^= (int) o1Case_;
       hash ^= (int) o2Case_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1458,6 +1577,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(48);
         output.WriteInt32(O2Int32);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1481,6 +1603,9 @@ namespace UnitTest.Issues.TestProtos {
       if (o2Case_ == O2OneofCase.O2String) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(O2String);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1513,6 +1638,7 @@ namespace UnitTest.Issues.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1521,7 +1647,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             PlainString = input.ReadString();
@@ -1555,6 +1681,7 @@ namespace UnitTest.Issues.TestProtos {
 
   public sealed partial class TestJsonName : pb::IMessage<TestJsonName> {
     private static readonly pb::MessageParser<TestJsonName> _parser = new pb::MessageParser<TestJsonName>(() => new TestJsonName());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestJsonName> Parser { get { return _parser; } }
 
@@ -1580,6 +1707,7 @@ namespace UnitTest.Issues.TestProtos {
       name_ = other.name_;
       description_ = other.description_;
       guid_ = other.guid_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1639,7 +1767,7 @@ namespace UnitTest.Issues.TestProtos {
       if (Name != other.Name) return false;
       if (Description != other.Description) return false;
       if (Guid != other.Guid) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1648,6 +1776,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (Description.Length != 0) hash ^= Description.GetHashCode();
       if (Guid.Length != 0) hash ^= Guid.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1670,6 +1801,9 @@ namespace UnitTest.Issues.TestProtos {
         output.WriteRawTag(26);
         output.WriteString(Guid);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1684,6 +1818,9 @@ namespace UnitTest.Issues.TestProtos {
       if (Guid.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Guid);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1701,6 +1838,7 @@ namespace UnitTest.Issues.TestProtos {
       if (other.Guid.Length != 0) {
         Guid = other.Guid;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1709,7 +1847,7 @@ namespace UnitTest.Issues.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1729,6 +1867,371 @@ namespace UnitTest.Issues.TestProtos {
 
   }
 
+  /// <summary>
+  /// Issue 3200: When merging two messages which use the same
+  /// oneof case, which is itself a message type, the submessages should
+  /// be merged.
+  /// </summary>
+  public sealed partial class OneofMerging : pb::IMessage<OneofMerging> {
+    private static readonly pb::MessageParser<OneofMerging> _parser = new pb::MessageParser<OneofMerging>(() => new OneofMerging());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<OneofMerging> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::UnitTest.Issues.TestProtos.UnittestIssuesReflection.Descriptor.MessageTypes[8]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public OneofMerging() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public OneofMerging(OneofMerging other) : this() {
+      switch (other.ValueCase) {
+        case ValueOneofCase.Text:
+          Text = other.Text;
+          break;
+        case ValueOneofCase.Nested:
+          Nested = other.Nested.Clone();
+          break;
+      }
+
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public OneofMerging Clone() {
+      return new OneofMerging(this);
+    }
+
+    /// <summary>Field number for the "text" field.</summary>
+    public const int TextFieldNumber = 1;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string Text {
+      get { return valueCase_ == ValueOneofCase.Text ? (string) value_ : ""; }
+      set {
+        value_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+        valueCase_ = ValueOneofCase.Text;
+      }
+    }
+
+    /// <summary>Field number for the "nested" field.</summary>
+    public const int NestedFieldNumber = 2;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested Nested {
+      get { return valueCase_ == ValueOneofCase.Nested ? (global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested) value_ : null; }
+      set {
+        value_ = value;
+        valueCase_ = value == null ? ValueOneofCase.None : ValueOneofCase.Nested;
+      }
+    }
+
+    private object value_;
+    /// <summary>Enum of possible cases for the "value" oneof.</summary>
+    public enum ValueOneofCase {
+      None = 0,
+      Text = 1,
+      Nested = 2,
+    }
+    private ValueOneofCase valueCase_ = ValueOneofCase.None;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ValueOneofCase ValueCase {
+      get { return valueCase_; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void ClearValue() {
+      valueCase_ = ValueOneofCase.None;
+      value_ = null;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as OneofMerging);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(OneofMerging other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (Text != other.Text) return false;
+      if (!object.Equals(Nested, other.Nested)) return false;
+      if (ValueCase != other.ValueCase) return false;
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (valueCase_ == ValueOneofCase.Text) hash ^= Text.GetHashCode();
+      if (valueCase_ == ValueOneofCase.Nested) hash ^= Nested.GetHashCode();
+      hash ^= (int) valueCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+      if (valueCase_ == ValueOneofCase.Text) {
+        output.WriteRawTag(10);
+        output.WriteString(Text);
+      }
+      if (valueCase_ == ValueOneofCase.Nested) {
+        output.WriteRawTag(18);
+        output.WriteMessage(Nested);
+      }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      if (valueCase_ == ValueOneofCase.Text) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Text);
+      }
+      if (valueCase_ == ValueOneofCase.Nested) {
+        size += 1 + pb::CodedOutputStream.ComputeMessageSize(Nested);
+      }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(OneofMerging other) {
+      if (other == null) {
+        return;
+      }
+      switch (other.ValueCase) {
+        case ValueOneofCase.Text:
+          Text = other.Text;
+          break;
+        case ValueOneofCase.Nested:
+          if (Nested == null) {
+            Nested = new global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested();
+          }
+          Nested.MergeFrom(other.Nested);
+          break;
+      }
+
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+          case 10: {
+            Text = input.ReadString();
+            break;
+          }
+          case 18: {
+            global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested subBuilder = new global::UnitTest.Issues.TestProtos.OneofMerging.Types.Nested();
+            if (valueCase_ == ValueOneofCase.Nested) {
+              subBuilder.MergeFrom(Nested);
+            }
+            input.ReadMessage(subBuilder);
+            Nested = subBuilder;
+            break;
+          }
+        }
+      }
+    }
+
+    #region Nested types
+    /// <summary>Container for nested types declared in the OneofMerging message type.</summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static partial class Types {
+      public sealed partial class Nested : pb::IMessage<Nested> {
+        private static readonly pb::MessageParser<Nested> _parser = new pb::MessageParser<Nested>(() => new Nested());
+        private pb::UnknownFieldSet _unknownFields;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pb::MessageParser<Nested> Parser { get { return _parser; } }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pbr::MessageDescriptor Descriptor {
+          get { return global::UnitTest.Issues.TestProtos.OneofMerging.Descriptor.NestedTypes[0]; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Nested() {
+          OnConstruction();
+        }
+
+        partial void OnConstruction();
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Nested(Nested other) : this() {
+          x_ = other.x_;
+          y_ = other.y_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public Nested Clone() {
+          return new Nested(this);
+        }
+
+        /// <summary>Field number for the "x" field.</summary>
+        public const int XFieldNumber = 1;
+        private int x_;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int X {
+          get { return x_; }
+          set {
+            x_ = value;
+          }
+        }
+
+        /// <summary>Field number for the "y" field.</summary>
+        public const int YFieldNumber = 2;
+        private int y_;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int Y {
+          get { return y_; }
+          set {
+            y_ = value;
+          }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override bool Equals(object other) {
+          return Equals(other as Nested);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public bool Equals(Nested other) {
+          if (ReferenceEquals(other, null)) {
+            return false;
+          }
+          if (ReferenceEquals(other, this)) {
+            return true;
+          }
+          if (X != other.X) return false;
+          if (Y != other.Y) return false;
+          return Equals(_unknownFields, other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override int GetHashCode() {
+          int hash = 1;
+          if (X != 0) hash ^= X.GetHashCode();
+          if (Y != 0) hash ^= Y.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
+          return hash;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override string ToString() {
+          return pb::JsonFormatter.ToDiagnosticString(this);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void WriteTo(pb::CodedOutputStream output) {
+          if (X != 0) {
+            output.WriteRawTag(8);
+            output.WriteInt32(X);
+          }
+          if (Y != 0) {
+            output.WriteRawTag(16);
+            output.WriteInt32(Y);
+          }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int CalculateSize() {
+          int size = 0;
+          if (X != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeInt32Size(X);
+          }
+          if (Y != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeInt32Size(Y);
+          }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
+          return size;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(Nested other) {
+          if (other == null) {
+            return;
+          }
+          if (other.X != 0) {
+            X = other.X;
+          }
+          if (other.Y != 0) {
+            Y = other.Y;
+          }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(pb::CodedInputStream input) {
+          uint tag;
+          while ((tag = input.ReadTag()) != 0) {
+            switch(tag) {
+              default:
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+                break;
+              case 8: {
+                X = input.ReadInt32();
+                break;
+              }
+              case 16: {
+                Y = input.ReadInt32();
+                break;
+              }
+            }
+          }
+        }
+
+      }
+
+    }
+    #endregion
+
+  }
+
   #endregion
 
 }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
index c11ab84d..d5dbe866 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/unittest_proto3.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: unittest_proto3.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -9,11 +11,11 @@ using pbr = global::Google.Protobuf.Reflection;
 using scg = global::System.Collections.Generic;
 namespace Google.Protobuf.TestProtos {
 
-  /// <summary>Holder for reflection information generated from google/protobuf/unittest_proto3.proto</summary>
+  /// <summary>Holder for reflection information generated from unittest_proto3.proto</summary>
   public static partial class UnittestProto3Reflection {
 
     #region Descriptor
-    /// <summary>File descriptor for google/protobuf/unittest_proto3.proto</summary>
+    /// <summary>File descriptor for unittest_proto3.proto</summary>
     public static pbr::FileDescriptor Descriptor {
       get { return descriptor; }
     }
@@ -22,135 +24,135 @@ namespace Google.Protobuf.TestProtos {
     static UnittestProto3Reflection() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "CiVnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfcHJvdG8zLnByb3RvEhFwcm90",
-            "b2J1Zl91bml0dGVzdBosZ29vZ2xlL3Byb3RvYnVmL3VuaXR0ZXN0X2ltcG9y",
-            "dF9wcm90bzMucHJvdG8i8A8KDFRlc3RBbGxUeXBlcxIUCgxzaW5nbGVfaW50",
-            "MzIYASABKAUSFAoMc2luZ2xlX2ludDY0GAIgASgDEhUKDXNpbmdsZV91aW50",
-            "MzIYAyABKA0SFQoNc2luZ2xlX3VpbnQ2NBgEIAEoBBIVCg1zaW5nbGVfc2lu",
-            "dDMyGAUgASgREhUKDXNpbmdsZV9zaW50NjQYBiABKBISFgoOc2luZ2xlX2Zp",
-            "eGVkMzIYByABKAcSFgoOc2luZ2xlX2ZpeGVkNjQYCCABKAYSFwoPc2luZ2xl",
-            "X3NmaXhlZDMyGAkgASgPEhcKD3NpbmdsZV9zZml4ZWQ2NBgKIAEoEBIUCgxz",
-            "aW5nbGVfZmxvYXQYCyABKAISFQoNc2luZ2xlX2RvdWJsZRgMIAEoARITCgtz",
-            "aW5nbGVfYm9vbBgNIAEoCBIVCg1zaW5nbGVfc3RyaW5nGA4gASgJEhQKDHNp",
-            "bmdsZV9ieXRlcxgPIAEoDBJMChVzaW5nbGVfbmVzdGVkX21lc3NhZ2UYEiAB",
-            "KAsyLS5wcm90b2J1Zl91bml0dGVzdC5UZXN0QWxsVHlwZXMuTmVzdGVkTWVz",
-            "c2FnZRJBChZzaW5nbGVfZm9yZWlnbl9tZXNzYWdlGBMgASgLMiEucHJvdG9i",
-            "dWZfdW5pdHRlc3QuRm9yZWlnbk1lc3NhZ2USRgoVc2luZ2xlX2ltcG9ydF9t",
-            "ZXNzYWdlGBQgASgLMicucHJvdG9idWZfdW5pdHRlc3RfaW1wb3J0LkltcG9y",
-            "dE1lc3NhZ2USRgoSc2luZ2xlX25lc3RlZF9lbnVtGBUgASgOMioucHJvdG9i",
-            "dWZfdW5pdHRlc3QuVGVzdEFsbFR5cGVzLk5lc3RlZEVudW0SOwoTc2luZ2xl",
-            "X2ZvcmVpZ25fZW51bRgWIAEoDjIeLnByb3RvYnVmX3VuaXR0ZXN0LkZvcmVp",
-            "Z25FbnVtEkAKEnNpbmdsZV9pbXBvcnRfZW51bRgXIAEoDjIkLnByb3RvYnVm",
-            "X3VuaXR0ZXN0X2ltcG9ydC5JbXBvcnRFbnVtElMKHHNpbmdsZV9wdWJsaWNf",
-            "aW1wb3J0X21lc3NhZ2UYGiABKAsyLS5wcm90b2J1Zl91bml0dGVzdF9pbXBv",
-            "cnQuUHVibGljSW1wb3J0TWVzc2FnZRIWCg5yZXBlYXRlZF9pbnQzMhgfIAMo",
-            "BRIWCg5yZXBlYXRlZF9pbnQ2NBggIAMoAxIXCg9yZXBlYXRlZF91aW50MzIY",
-            "ISADKA0SFwoPcmVwZWF0ZWRfdWludDY0GCIgAygEEhcKD3JlcGVhdGVkX3Np",
-            "bnQzMhgjIAMoERIXCg9yZXBlYXRlZF9zaW50NjQYJCADKBISGAoQcmVwZWF0",
-            "ZWRfZml4ZWQzMhglIAMoBxIYChByZXBlYXRlZF9maXhlZDY0GCYgAygGEhkK",
-            "EXJlcGVhdGVkX3NmaXhlZDMyGCcgAygPEhkKEXJlcGVhdGVkX3NmaXhlZDY0",
-            "GCggAygQEhYKDnJlcGVhdGVkX2Zsb2F0GCkgAygCEhcKD3JlcGVhdGVkX2Rv",
-            "dWJsZRgqIAMoARIVCg1yZXBlYXRlZF9ib29sGCsgAygIEhcKD3JlcGVhdGVk",
-            "X3N0cmluZxgsIAMoCRIWCg5yZXBlYXRlZF9ieXRlcxgtIAMoDBJOChdyZXBl",
-            "YXRlZF9uZXN0ZWRfbWVzc2FnZRgwIAMoCzItLnByb3RvYnVmX3VuaXR0ZXN0",
-            "LlRlc3RBbGxUeXBlcy5OZXN0ZWRNZXNzYWdlEkMKGHJlcGVhdGVkX2ZvcmVp",
-            "Z25fbWVzc2FnZRgxIAMoCzIhLnByb3RvYnVmX3VuaXR0ZXN0LkZvcmVpZ25N",
-            "ZXNzYWdlEkgKF3JlcGVhdGVkX2ltcG9ydF9tZXNzYWdlGDIgAygLMicucHJv",
-            "dG9idWZfdW5pdHRlc3RfaW1wb3J0LkltcG9ydE1lc3NhZ2USSAoUcmVwZWF0",
-            "ZWRfbmVzdGVkX2VudW0YMyADKA4yKi5wcm90b2J1Zl91bml0dGVzdC5UZXN0",
-            "QWxsVHlwZXMuTmVzdGVkRW51bRI9ChVyZXBlYXRlZF9mb3JlaWduX2VudW0Y",
-            "NCADKA4yHi5wcm90b2J1Zl91bml0dGVzdC5Gb3JlaWduRW51bRJCChRyZXBl",
-            "YXRlZF9pbXBvcnRfZW51bRg1IAMoDjIkLnByb3RvYnVmX3VuaXR0ZXN0X2lt",
-            "cG9ydC5JbXBvcnRFbnVtElUKHnJlcGVhdGVkX3B1YmxpY19pbXBvcnRfbWVz",
-            "c2FnZRg2IAMoCzItLnByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydC5QdWJsaWNJ",
-            "bXBvcnRNZXNzYWdlEhYKDG9uZW9mX3VpbnQzMhhvIAEoDUgAEk0KFG9uZW9m",
-            "X25lc3RlZF9tZXNzYWdlGHAgASgLMi0ucHJvdG9idWZfdW5pdHRlc3QuVGVz",
-            "dEFsbFR5cGVzLk5lc3RlZE1lc3NhZ2VIABIWCgxvbmVvZl9zdHJpbmcYcSAB",
-            "KAlIABIVCgtvbmVvZl9ieXRlcxhyIAEoDEgAGhsKDU5lc3RlZE1lc3NhZ2US",
-            "CgoCYmIYASABKAUiVgoKTmVzdGVkRW51bRIbChdORVNURURfRU5VTV9VTlNQ",
-            "RUNJRklFRBAAEgcKA0ZPTxABEgcKA0JBUhACEgcKA0JBWhADEhAKA05FRxD/",
-            "//////////8BQg0KC29uZW9mX2ZpZWxkIrsBChJOZXN0ZWRUZXN0QWxsVHlw",
-            "ZXMSNAoFY2hpbGQYASABKAsyJS5wcm90b2J1Zl91bml0dGVzdC5OZXN0ZWRU",
-            "ZXN0QWxsVHlwZXMSMAoHcGF5bG9hZBgCIAEoCzIfLnByb3RvYnVmX3VuaXR0",
-            "ZXN0LlRlc3RBbGxUeXBlcxI9Cg5yZXBlYXRlZF9jaGlsZBgDIAMoCzIlLnBy",
-            "b3RvYnVmX3VuaXR0ZXN0Lk5lc3RlZFRlc3RBbGxUeXBlcyI0ChRUZXN0RGVw",
-            "cmVjYXRlZEZpZWxkcxIcChBkZXByZWNhdGVkX2ludDMyGAEgASgFQgIYASIb",
-            "Cg5Gb3JlaWduTWVzc2FnZRIJCgFjGAEgASgFIjAKElRlc3RSZXNlcnZlZEZp",
-            "ZWxkc0oECAIQA0oECA8QEEoECAkQDFIDYmFyUgNiYXoiWgoRVGVzdEZvcmVp",
-            "Z25OZXN0ZWQSRQoOZm9yZWlnbl9uZXN0ZWQYASABKAsyLS5wcm90b2J1Zl91",
-            "bml0dGVzdC5UZXN0QWxsVHlwZXMuTmVzdGVkTWVzc2FnZSI0ChhUZXN0UmVh",
-            "bGx5TGFyZ2VUYWdOdW1iZXISCQoBYRgBIAEoBRINCgJiYhj///9/IAEoBSJV",
-            "ChRUZXN0UmVjdXJzaXZlTWVzc2FnZRIyCgFhGAEgASgLMicucHJvdG9idWZf",
-            "dW5pdHRlc3QuVGVzdFJlY3Vyc2l2ZU1lc3NhZ2USCQoBaRgCIAEoBSJLChRU",
-            "ZXN0TXV0dWFsUmVjdXJzaW9uQRIzCgJiYhgBIAEoCzInLnByb3RvYnVmX3Vu",
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+            "ZFR5cGVzEhoKDnVucGFja2VkX2ludDMyGFogAygFQgIQABIaCg51bnBhY2tl",
+            "ZF9pbnQ2NBhbIAMoA0ICEAASGwoPdW5wYWNrZWRfdWludDMyGFwgAygNQgIQ",
+            "ABIbCg91bnBhY2tlZF91aW50NjQYXSADKARCAhAAEhsKD3VucGFja2VkX3Np",
+            "bnQzMhheIAMoEUICEAASGwoPdW5wYWNrZWRfc2ludDY0GF8gAygSQgIQABIc",
+            "ChB1bnBhY2tlZF9maXhlZDMyGGAgAygHQgIQABIcChB1bnBhY2tlZF9maXhl",
+            "ZDY0GGEgAygGQgIQABIdChF1bnBhY2tlZF9zZml4ZWQzMhhiIAMoD0ICEAAS",
+            "HQoRdW5wYWNrZWRfc2ZpeGVkNjQYYyADKBBCAhAAEhoKDnVucGFja2VkX2Zs",
+            "b2F0GGQgAygCQgIQABIbCg91bnBhY2tlZF9kb3VibGUYZSADKAFCAhAAEhkK",
+            "DXVucGFja2VkX2Jvb2wYZiADKAhCAhAAEjoKDXVucGFja2VkX2VudW0YZyAD",
+            "KA4yHy5wcm90b2J1Zl91bml0dGVzdDMuRm9yZWlnbkVudW1CAhAAIsABCiNU",
+            "ZXN0UmVwZWF0ZWRTY2FsYXJEaWZmZXJlbnRUYWdTaXplcxIYChByZXBlYXRl",
+            "ZF9maXhlZDMyGAwgAygHEhYKDnJlcGVhdGVkX2ludDMyGA0gAygFEhkKEHJl",
+            "cGVhdGVkX2ZpeGVkNjQY/g8gAygGEhcKDnJlcGVhdGVkX2ludDY0GP8PIAMo",
+            "AxIYCg5yZXBlYXRlZF9mbG9hdBj+/w8gAygCEhkKD3JlcGVhdGVkX3VpbnQ2",
+            "NBj//w8gAygEIigKG1Rlc3RDb21tZW50SW5qZWN0aW9uTWVzc2FnZRIJCgFh",
+            "GAEgASgJIgwKCkZvb1JlcXVlc3QiDQoLRm9vUmVzcG9uc2UiEgoQRm9vQ2xp",
+            "ZW50TWVzc2FnZSISChBGb29TZXJ2ZXJNZXNzYWdlIgwKCkJhclJlcXVlc3Qi",
+            "DQoLQmFyUmVzcG9uc2UiEgoQVGVzdEVtcHR5TWVzc2FnZSpZCgtGb3JlaWdu",
+            "RW51bRIXChNGT1JFSUdOX1VOU1BFQ0lGSUVEEAASDwoLRk9SRUlHTl9GT08Q",
+            "BBIPCgtGT1JFSUdOX0JBUhAFEg8KC0ZPUkVJR05fQkFaEAYqdQoUVGVzdEVu",
+            "dW1XaXRoRHVwVmFsdWUSKAokVEVTVF9FTlVNX1dJVEhfRFVQX1ZBTFVFX1VO",
+            "U1BFQ0lGSUVEEAASCAoERk9PMRABEggKBEJBUjEQAhIHCgNCQVoQAxIICgRG",
+            "T08yEAESCAoEQkFSMhACGgIQASqdAQoOVGVzdFNwYXJzZUVudW0SIAocVEVT",
+            "VF9TUEFSU0VfRU5VTV9VTlNQRUNJRklFRBAAEgwKCFNQQVJTRV9BEHsSDgoI",
+            "U1BBUlNFX0IQpucDEg8KCFNQQVJTRV9DELKxgAYSFQoIU1BBUlNFX0QQ8f//",
+            "////////ARIVCghTUEFSU0VfRRC03vz///////8BEgwKCFNQQVJTRV9HEAIy",
+            "nQEKC1Rlc3RTZXJ2aWNlEkYKA0ZvbxIeLnByb3RvYnVmX3VuaXR0ZXN0My5G",
+            "b29SZXF1ZXN0Gh8ucHJvdG9idWZfdW5pdHRlc3QzLkZvb1Jlc3BvbnNlEkYK",
+            "A0JhchIeLnByb3RvYnVmX3VuaXR0ZXN0My5CYXJSZXF1ZXN0Gh8ucHJvdG9i",
+            "dWZfdW5pdHRlc3QzLkJhclJlc3BvbnNlQixCDVVuaXR0ZXN0UHJvdG+qAhpH",
+            "b29nbGUuUHJvdG9idWYuVGVzdFByb3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportProto3Reflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Google.Protobuf.TestProtos.ForeignEnum), typeof(global::Google.Protobuf.TestProtos.TestEnumWithDupValue), typeof(global::Google.Protobuf.TestProtos.TestSparseEnum), }, new pbr::GeneratedClrTypeInfo[] {
@@ -187,7 +189,8 @@ namespace Google.Protobuf.TestProtos {
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.FooClientMessage), global::Google.Protobuf.TestProtos.FooClientMessage.Parser, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.FooServerMessage), global::Google.Protobuf.TestProtos.FooServerMessage.Parser, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.BarRequest), global::Google.Protobuf.TestProtos.BarRequest.Parser, null, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.BarResponse), global::Google.Protobuf.TestProtos.BarResponse.Parser, null, null, null, null)
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.BarResponse), global::Google.Protobuf.TestProtos.BarResponse.Parser, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.TestProtos.TestEmptyMessage), global::Google.Protobuf.TestProtos.TestEmptyMessage.Parser, null, null, null, null)
           }));
     }
     #endregion
@@ -239,6 +242,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestAllTypes : pb::IMessage<TestAllTypes> {
     private static readonly pb::MessageParser<TestAllTypes> _parser = new pb::MessageParser<TestAllTypes>(() => new TestAllTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestAllTypes> Parser { get { return _parser; } }
 
@@ -276,13 +280,13 @@ namespace Google.Protobuf.TestProtos {
       singleBool_ = other.singleBool_;
       singleString_ = other.singleString_;
       singleBytes_ = other.singleBytes_;
-      SingleNestedMessage = other.singleNestedMessage_ != null ? other.SingleNestedMessage.Clone() : null;
-      SingleForeignMessage = other.singleForeignMessage_ != null ? other.SingleForeignMessage.Clone() : null;
-      SingleImportMessage = other.singleImportMessage_ != null ? other.SingleImportMessage.Clone() : null;
+      singleNestedMessage_ = other.singleNestedMessage_ != null ? other.singleNestedMessage_.Clone() : null;
+      singleForeignMessage_ = other.singleForeignMessage_ != null ? other.singleForeignMessage_.Clone() : null;
+      singleImportMessage_ = other.singleImportMessage_ != null ? other.singleImportMessage_.Clone() : null;
       singleNestedEnum_ = other.singleNestedEnum_;
       singleForeignEnum_ = other.singleForeignEnum_;
       singleImportEnum_ = other.singleImportEnum_;
-      SinglePublicImportMessage = other.singlePublicImportMessage_ != null ? other.SinglePublicImportMessage.Clone() : null;
+      singlePublicImportMessage_ = other.singlePublicImportMessage_ != null ? other.singlePublicImportMessage_.Clone() : null;
       repeatedInt32_ = other.repeatedInt32_.Clone();
       repeatedInt64_ = other.repeatedInt64_.Clone();
       repeatedUint32_ = other.repeatedUint32_.Clone();
@@ -320,6 +324,7 @@ namespace Google.Protobuf.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -889,8 +894,8 @@ namespace Google.Protobuf.TestProtos {
       if (SingleFixed64 != other.SingleFixed64) return false;
       if (SingleSfixed32 != other.SingleSfixed32) return false;
       if (SingleSfixed64 != other.SingleSfixed64) return false;
-      if (SingleFloat != other.SingleFloat) return false;
-      if (SingleDouble != other.SingleDouble) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals(SingleFloat, other.SingleFloat)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(SingleDouble, other.SingleDouble)) return false;
       if (SingleBool != other.SingleBool) return false;
       if (SingleString != other.SingleString) return false;
       if (SingleBytes != other.SingleBytes) return false;
@@ -928,7 +933,7 @@ namespace Google.Protobuf.TestProtos {
       if (OneofString != other.OneofString) return false;
       if (OneofBytes != other.OneofBytes) return false;
       if (OneofFieldCase != other.OneofFieldCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -944,8 +949,8 @@ namespace Google.Protobuf.TestProtos {
       if (SingleFixed64 != 0UL) hash ^= SingleFixed64.GetHashCode();
       if (SingleSfixed32 != 0) hash ^= SingleSfixed32.GetHashCode();
       if (SingleSfixed64 != 0L) hash ^= SingleSfixed64.GetHashCode();
-      if (SingleFloat != 0F) hash ^= SingleFloat.GetHashCode();
-      if (SingleDouble != 0D) hash ^= SingleDouble.GetHashCode();
+      if (SingleFloat != 0F) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode(SingleFloat);
+      if (SingleDouble != 0D) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(SingleDouble);
       if (SingleBool != false) hash ^= SingleBool.GetHashCode();
       if (SingleString.Length != 0) hash ^= SingleString.GetHashCode();
       if (SingleBytes.Length != 0) hash ^= SingleBytes.GetHashCode();
@@ -983,6 +988,9 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) hash ^= OneofString.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) hash ^= OneofBytes.GetHashCode();
       hash ^= (int) oneofFieldCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1119,6 +1127,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(146, 7);
         output.WriteBytes(OneofBytes);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1224,6 +1235,9 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         size += 2 + pb::CodedOutputStream.ComputeBytesSize(OneofBytes);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1337,7 +1351,10 @@ namespace Google.Protobuf.TestProtos {
           OneofUint32 = other.OneofUint32;
           break;
         case OneofFieldOneofCase.OneofNestedMessage:
-          OneofNestedMessage = other.OneofNestedMessage;
+          if (OneofNestedMessage == null) {
+            OneofNestedMessage = new global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage();
+          }
+          OneofNestedMessage.MergeFrom(other.OneofNestedMessage);
           break;
         case OneofFieldOneofCase.OneofString:
           OneofString = other.OneofString;
@@ -1347,6 +1364,7 @@ namespace Google.Protobuf.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1355,7 +1373,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             SingleInt32 = input.ReadInt32();
@@ -1603,6 +1621,7 @@ namespace Google.Protobuf.TestProtos {
 
       public sealed partial class NestedMessage : pb::IMessage<NestedMessage> {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
@@ -1626,6 +1645,7 @@ namespace Google.Protobuf.TestProtos {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public NestedMessage(NestedMessage other) : this() {
           bb_ = other.bb_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1663,13 +1683,16 @@ namespace Google.Protobuf.TestProtos {
             return true;
           }
           if (Bb != other.Bb) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
           if (Bb != 0) hash ^= Bb.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -1684,6 +1707,9 @@ namespace Google.Protobuf.TestProtos {
             output.WriteRawTag(8);
             output.WriteInt32(Bb);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1692,6 +1718,9 @@ namespace Google.Protobuf.TestProtos {
           if (Bb != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(Bb);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -1703,6 +1732,7 @@ namespace Google.Protobuf.TestProtos {
           if (other.Bb != 0) {
             Bb = other.Bb;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1711,7 +1741,7 @@ namespace Google.Protobuf.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 Bb = input.ReadInt32();
@@ -1733,6 +1763,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class NestedTestAllTypes : pb::IMessage<NestedTestAllTypes> {
     private static readonly pb::MessageParser<NestedTestAllTypes> _parser = new pb::MessageParser<NestedTestAllTypes>(() => new NestedTestAllTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<NestedTestAllTypes> Parser { get { return _parser; } }
 
@@ -1755,9 +1786,10 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public NestedTestAllTypes(NestedTestAllTypes other) : this() {
-      Child = other.child_ != null ? other.Child.Clone() : null;
-      Payload = other.payload_ != null ? other.Payload.Clone() : null;
+      child_ = other.child_ != null ? other.child_.Clone() : null;
+      payload_ = other.payload_ != null ? other.payload_.Clone() : null;
       repeatedChild_ = other.repeatedChild_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1813,7 +1845,7 @@ namespace Google.Protobuf.TestProtos {
       if (!object.Equals(Child, other.Child)) return false;
       if (!object.Equals(Payload, other.Payload)) return false;
       if(!repeatedChild_.Equals(other.repeatedChild_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1822,6 +1854,9 @@ namespace Google.Protobuf.TestProtos {
       if (child_ != null) hash ^= Child.GetHashCode();
       if (payload_ != null) hash ^= Payload.GetHashCode();
       hash ^= repeatedChild_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1841,6 +1876,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteMessage(Payload);
       }
       repeatedChild_.WriteTo(output, _repeated_repeatedChild_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1853,6 +1891,9 @@ namespace Google.Protobuf.TestProtos {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Payload);
       }
       size += repeatedChild_.CalculateSize(_repeated_repeatedChild_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1874,6 +1915,7 @@ namespace Google.Protobuf.TestProtos {
         Payload.MergeFrom(other.Payload);
       }
       repeatedChild_.Add(other.repeatedChild_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1882,7 +1924,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (child_ == null) {
@@ -1910,6 +1952,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestDeprecatedFields : pb::IMessage<TestDeprecatedFields> {
     private static readonly pb::MessageParser<TestDeprecatedFields> _parser = new pb::MessageParser<TestDeprecatedFields>(() => new TestDeprecatedFields());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestDeprecatedFields> Parser { get { return _parser; } }
 
@@ -1933,6 +1976,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestDeprecatedFields(TestDeprecatedFields other) : this() {
       deprecatedInt32_ = other.deprecatedInt32_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1966,13 +2010,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (DeprecatedInt32 != other.DeprecatedInt32) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (DeprecatedInt32 != 0) hash ^= DeprecatedInt32.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1987,6 +2034,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(DeprecatedInt32);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1995,6 +2045,9 @@ namespace Google.Protobuf.TestProtos {
       if (DeprecatedInt32 != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(DeprecatedInt32);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2006,6 +2059,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.DeprecatedInt32 != 0) {
         DeprecatedInt32 = other.DeprecatedInt32;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2014,7 +2068,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             DeprecatedInt32 = input.ReadInt32();
@@ -2032,6 +2086,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class ForeignMessage : pb::IMessage<ForeignMessage> {
     private static readonly pb::MessageParser<ForeignMessage> _parser = new pb::MessageParser<ForeignMessage>(() => new ForeignMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ForeignMessage> Parser { get { return _parser; } }
 
@@ -2055,6 +2110,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ForeignMessage(ForeignMessage other) : this() {
       c_ = other.c_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2087,13 +2143,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (C != other.C) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (C != 0) hash ^= C.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2108,6 +2167,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(C);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2116,6 +2178,9 @@ namespace Google.Protobuf.TestProtos {
       if (C != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(C);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2127,6 +2192,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.C != 0) {
         C = other.C;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2135,7 +2201,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             C = input.ReadInt32();
@@ -2149,6 +2215,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestReservedFields : pb::IMessage<TestReservedFields> {
     private static readonly pb::MessageParser<TestReservedFields> _parser = new pb::MessageParser<TestReservedFields>(() => new TestReservedFields());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestReservedFields> Parser { get { return _parser; } }
 
@@ -2171,6 +2238,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestReservedFields(TestReservedFields other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2191,12 +2259,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2207,11 +2278,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2220,6 +2297,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2228,7 +2306,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -2241,6 +2319,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestForeignNested : pb::IMessage<TestForeignNested> {
     private static readonly pb::MessageParser<TestForeignNested> _parser = new pb::MessageParser<TestForeignNested>(() => new TestForeignNested());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestForeignNested> Parser { get { return _parser; } }
 
@@ -2263,7 +2342,8 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestForeignNested(TestForeignNested other) : this() {
-      ForeignNested = other.foreignNested_ != null ? other.ForeignNested.Clone() : null;
+      foreignNested_ = other.foreignNested_ != null ? other.foreignNested_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2296,13 +2376,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!object.Equals(ForeignNested, other.ForeignNested)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (foreignNested_ != null) hash ^= ForeignNested.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2317,6 +2400,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteMessage(ForeignNested);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2325,6 +2411,9 @@ namespace Google.Protobuf.TestProtos {
       if (foreignNested_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(ForeignNested);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2339,6 +2428,7 @@ namespace Google.Protobuf.TestProtos {
         }
         ForeignNested.MergeFrom(other.ForeignNested);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2347,7 +2437,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (foreignNested_ == null) {
@@ -2367,6 +2457,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestReallyLargeTagNumber : pb::IMessage<TestReallyLargeTagNumber> {
     private static readonly pb::MessageParser<TestReallyLargeTagNumber> _parser = new pb::MessageParser<TestReallyLargeTagNumber>(() => new TestReallyLargeTagNumber());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestReallyLargeTagNumber> Parser { get { return _parser; } }
 
@@ -2391,6 +2482,7 @@ namespace Google.Protobuf.TestProtos {
     public TestReallyLargeTagNumber(TestReallyLargeTagNumber other) : this() {
       a_ = other.a_;
       bb_ = other.bb_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2439,7 +2531,7 @@ namespace Google.Protobuf.TestProtos {
       }
       if (A != other.A) return false;
       if (Bb != other.Bb) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2447,6 +2539,9 @@ namespace Google.Protobuf.TestProtos {
       int hash = 1;
       if (A != 0) hash ^= A.GetHashCode();
       if (Bb != 0) hash ^= Bb.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2465,6 +2560,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(248, 255, 255, 255, 7);
         output.WriteInt32(Bb);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2476,6 +2574,9 @@ namespace Google.Protobuf.TestProtos {
       if (Bb != 0) {
         size += 5 + pb::CodedOutputStream.ComputeInt32Size(Bb);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2490,6 +2591,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Bb != 0) {
         Bb = other.Bb;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2498,7 +2600,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             A = input.ReadInt32();
@@ -2516,6 +2618,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestRecursiveMessage : pb::IMessage<TestRecursiveMessage> {
     private static readonly pb::MessageParser<TestRecursiveMessage> _parser = new pb::MessageParser<TestRecursiveMessage>(() => new TestRecursiveMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestRecursiveMessage> Parser { get { return _parser; } }
 
@@ -2538,8 +2641,9 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestRecursiveMessage(TestRecursiveMessage other) : this() {
-      A = other.a_ != null ? other.A.Clone() : null;
+      a_ = other.a_ != null ? other.a_.Clone() : null;
       i_ = other.i_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2584,7 +2688,7 @@ namespace Google.Protobuf.TestProtos {
       }
       if (!object.Equals(A, other.A)) return false;
       if (I != other.I) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2592,6 +2696,9 @@ namespace Google.Protobuf.TestProtos {
       int hash = 1;
       if (a_ != null) hash ^= A.GetHashCode();
       if (I != 0) hash ^= I.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2610,6 +2717,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(16);
         output.WriteInt32(I);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2621,6 +2731,9 @@ namespace Google.Protobuf.TestProtos {
       if (I != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(I);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2638,6 +2751,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.I != 0) {
         I = other.I;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2646,7 +2760,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (a_ == null) {
@@ -2670,6 +2784,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestMutualRecursionA : pb::IMessage<TestMutualRecursionA> {
     private static readonly pb::MessageParser<TestMutualRecursionA> _parser = new pb::MessageParser<TestMutualRecursionA>(() => new TestMutualRecursionA());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMutualRecursionA> Parser { get { return _parser; } }
 
@@ -2692,7 +2807,8 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestMutualRecursionA(TestMutualRecursionA other) : this() {
-      Bb = other.bb_ != null ? other.Bb.Clone() : null;
+      bb_ = other.bb_ != null ? other.bb_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2725,13 +2841,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (!object.Equals(Bb, other.Bb)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (bb_ != null) hash ^= Bb.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2746,6 +2865,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteMessage(Bb);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2754,6 +2876,9 @@ namespace Google.Protobuf.TestProtos {
       if (bb_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Bb);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2768,6 +2893,7 @@ namespace Google.Protobuf.TestProtos {
         }
         Bb.MergeFrom(other.Bb);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2776,7 +2902,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (bb_ == null) {
@@ -2793,6 +2919,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestMutualRecursionB : pb::IMessage<TestMutualRecursionB> {
     private static readonly pb::MessageParser<TestMutualRecursionB> _parser = new pb::MessageParser<TestMutualRecursionB>(() => new TestMutualRecursionB());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestMutualRecursionB> Parser { get { return _parser; } }
 
@@ -2815,8 +2942,9 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestMutualRecursionB(TestMutualRecursionB other) : this() {
-      A = other.a_ != null ? other.A.Clone() : null;
+      a_ = other.a_ != null ? other.a_.Clone() : null;
       optionalInt32_ = other.optionalInt32_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2861,7 +2989,7 @@ namespace Google.Protobuf.TestProtos {
       }
       if (!object.Equals(A, other.A)) return false;
       if (OptionalInt32 != other.OptionalInt32) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2869,6 +2997,9 @@ namespace Google.Protobuf.TestProtos {
       int hash = 1;
       if (a_ != null) hash ^= A.GetHashCode();
       if (OptionalInt32 != 0) hash ^= OptionalInt32.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2887,6 +3018,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(16);
         output.WriteInt32(OptionalInt32);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2898,6 +3032,9 @@ namespace Google.Protobuf.TestProtos {
       if (OptionalInt32 != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(OptionalInt32);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2915,6 +3052,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.OptionalInt32 != 0) {
         OptionalInt32 = other.OptionalInt32;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2923,7 +3061,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (a_ == null) {
@@ -2944,6 +3082,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestEnumAllowAlias : pb::IMessage<TestEnumAllowAlias> {
     private static readonly pb::MessageParser<TestEnumAllowAlias> _parser = new pb::MessageParser<TestEnumAllowAlias>(() => new TestEnumAllowAlias());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestEnumAllowAlias> Parser { get { return _parser; } }
 
@@ -2967,6 +3106,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestEnumAllowAlias(TestEnumAllowAlias other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2999,13 +3139,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3020,6 +3163,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteEnum((int) Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3028,6 +3174,9 @@ namespace Google.Protobuf.TestProtos {
       if (Value != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3039,6 +3188,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Value != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3047,7 +3197,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             value_ = (global::Google.Protobuf.TestProtos.TestEnumWithDupValue) input.ReadEnum();
@@ -3065,6 +3215,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestCamelCaseFieldNames : pb::IMessage<TestCamelCaseFieldNames> {
     private static readonly pb::MessageParser<TestCamelCaseFieldNames> _parser = new pb::MessageParser<TestCamelCaseFieldNames>(() => new TestCamelCaseFieldNames());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestCamelCaseFieldNames> Parser { get { return _parser; } }
 
@@ -3090,11 +3241,12 @@ namespace Google.Protobuf.TestProtos {
       primitiveField_ = other.primitiveField_;
       stringField_ = other.stringField_;
       enumField_ = other.enumField_;
-      MessageField = other.messageField_ != null ? other.MessageField.Clone() : null;
+      messageField_ = other.messageField_ != null ? other.messageField_.Clone() : null;
       repeatedPrimitiveField_ = other.repeatedPrimitiveField_.Clone();
       repeatedStringField_ = other.repeatedStringField_.Clone();
       repeatedEnumField_ = other.repeatedEnumField_.Clone();
       repeatedMessageField_ = other.repeatedMessageField_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3207,7 +3359,7 @@ namespace Google.Protobuf.TestProtos {
       if(!repeatedStringField_.Equals(other.repeatedStringField_)) return false;
       if(!repeatedEnumField_.Equals(other.repeatedEnumField_)) return false;
       if(!repeatedMessageField_.Equals(other.repeatedMessageField_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3221,6 +3373,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= repeatedStringField_.GetHashCode();
       hash ^= repeatedEnumField_.GetHashCode();
       hash ^= repeatedMessageField_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3251,6 +3406,9 @@ namespace Google.Protobuf.TestProtos {
       repeatedStringField_.WriteTo(output, _repeated_repeatedStringField_codec);
       repeatedEnumField_.WriteTo(output, _repeated_repeatedEnumField_codec);
       repeatedMessageField_.WriteTo(output, _repeated_repeatedMessageField_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3272,6 +3430,9 @@ namespace Google.Protobuf.TestProtos {
       size += repeatedStringField_.CalculateSize(_repeated_repeatedStringField_codec);
       size += repeatedEnumField_.CalculateSize(_repeated_repeatedEnumField_codec);
       size += repeatedMessageField_.CalculateSize(_repeated_repeatedMessageField_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3299,6 +3460,7 @@ namespace Google.Protobuf.TestProtos {
       repeatedStringField_.Add(other.repeatedStringField_);
       repeatedEnumField_.Add(other.repeatedEnumField_);
       repeatedMessageField_.Add(other.repeatedMessageField_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3307,7 +3469,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             PrimitiveField = input.ReadInt32();
@@ -3358,6 +3520,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestFieldOrderings : pb::IMessage<TestFieldOrderings> {
     private static readonly pb::MessageParser<TestFieldOrderings> _parser = new pb::MessageParser<TestFieldOrderings>(() => new TestFieldOrderings());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestFieldOrderings> Parser { get { return _parser; } }
 
@@ -3383,7 +3546,8 @@ namespace Google.Protobuf.TestProtos {
       myString_ = other.myString_;
       myInt_ = other.myInt_;
       myFloat_ = other.myFloat_;
-      SingleNestedMessage = other.singleNestedMessage_ != null ? other.SingleNestedMessage.Clone() : null;
+      singleNestedMessage_ = other.singleNestedMessage_ != null ? other.singleNestedMessage_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3450,9 +3614,9 @@ namespace Google.Protobuf.TestProtos {
       }
       if (MyString != other.MyString) return false;
       if (MyInt != other.MyInt) return false;
-      if (MyFloat != other.MyFloat) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals(MyFloat, other.MyFloat)) return false;
       if (!object.Equals(SingleNestedMessage, other.SingleNestedMessage)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3460,8 +3624,11 @@ namespace Google.Protobuf.TestProtos {
       int hash = 1;
       if (MyString.Length != 0) hash ^= MyString.GetHashCode();
       if (MyInt != 0L) hash ^= MyInt.GetHashCode();
-      if (MyFloat != 0F) hash ^= MyFloat.GetHashCode();
+      if (MyFloat != 0F) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode(MyFloat);
       if (singleNestedMessage_ != null) hash ^= SingleNestedMessage.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3488,6 +3655,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(194, 12);
         output.WriteMessage(SingleNestedMessage);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3505,6 +3675,9 @@ namespace Google.Protobuf.TestProtos {
       if (singleNestedMessage_ != null) {
         size += 2 + pb::CodedOutputStream.ComputeMessageSize(SingleNestedMessage);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3528,6 +3701,7 @@ namespace Google.Protobuf.TestProtos {
         }
         SingleNestedMessage.MergeFrom(other.SingleNestedMessage);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3536,7 +3710,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             MyInt = input.ReadInt64();
@@ -3567,6 +3741,7 @@ namespace Google.Protobuf.TestProtos {
     public static partial class Types {
       public sealed partial class NestedMessage : pb::IMessage<NestedMessage> {
         private static readonly pb::MessageParser<NestedMessage> _parser = new pb::MessageParser<NestedMessage>(() => new NestedMessage());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NestedMessage> Parser { get { return _parser; } }
 
@@ -3591,6 +3766,7 @@ namespace Google.Protobuf.TestProtos {
         public NestedMessage(NestedMessage other) : this() {
           oo_ = other.oo_;
           bb_ = other.bb_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3640,7 +3816,7 @@ namespace Google.Protobuf.TestProtos {
           }
           if (Oo != other.Oo) return false;
           if (Bb != other.Bb) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3648,6 +3824,9 @@ namespace Google.Protobuf.TestProtos {
           int hash = 1;
           if (Oo != 0L) hash ^= Oo.GetHashCode();
           if (Bb != 0) hash ^= Bb.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -3666,6 +3845,9 @@ namespace Google.Protobuf.TestProtos {
             output.WriteRawTag(16);
             output.WriteInt64(Oo);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3677,6 +3859,9 @@ namespace Google.Protobuf.TestProtos {
           if (Bb != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(Bb);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -3691,6 +3876,7 @@ namespace Google.Protobuf.TestProtos {
           if (other.Bb != 0) {
             Bb = other.Bb;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3699,7 +3885,7 @@ namespace Google.Protobuf.TestProtos {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 Bb = input.ReadInt32();
@@ -3722,6 +3908,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class SparseEnumMessage : pb::IMessage<SparseEnumMessage> {
     private static readonly pb::MessageParser<SparseEnumMessage> _parser = new pb::MessageParser<SparseEnumMessage>(() => new SparseEnumMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<SparseEnumMessage> Parser { get { return _parser; } }
 
@@ -3745,6 +3932,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public SparseEnumMessage(SparseEnumMessage other) : this() {
       sparseEnum_ = other.sparseEnum_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3777,13 +3965,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (SparseEnum != other.SparseEnum) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (SparseEnum != 0) hash ^= SparseEnum.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3798,6 +3989,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteEnum((int) SparseEnum);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3806,6 +4000,9 @@ namespace Google.Protobuf.TestProtos {
       if (SparseEnum != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) SparseEnum);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3817,6 +4014,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.SparseEnum != 0) {
         SparseEnum = other.SparseEnum;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3825,7 +4023,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             sparseEnum_ = (global::Google.Protobuf.TestProtos.TestSparseEnum) input.ReadEnum();
@@ -3842,6 +4040,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class OneString : pb::IMessage<OneString> {
     private static readonly pb::MessageParser<OneString> _parser = new pb::MessageParser<OneString>(() => new OneString());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<OneString> Parser { get { return _parser; } }
 
@@ -3865,6 +4064,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public OneString(OneString other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3897,13 +4097,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data.Length != 0) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3918,6 +4121,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteString(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3926,6 +4132,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3937,6 +4146,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data.Length != 0) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3945,7 +4155,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Data = input.ReadString();
@@ -3959,6 +4169,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class MoreString : pb::IMessage<MoreString> {
     private static readonly pb::MessageParser<MoreString> _parser = new pb::MessageParser<MoreString>(() => new MoreString());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MoreString> Parser { get { return _parser; } }
 
@@ -3982,6 +4193,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public MoreString(MoreString other) : this() {
       data_ = other.data_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4013,13 +4225,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if(!data_.Equals(other.data_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= data_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4031,12 +4246,18 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       data_.WriteTo(output, _repeated_data_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += data_.CalculateSize(_repeated_data_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4046,6 +4267,7 @@ namespace Google.Protobuf.TestProtos {
         return;
       }
       data_.Add(other.data_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4054,7 +4276,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             data_.AddEntriesFrom(input, _repeated_data_codec);
@@ -4068,6 +4290,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class OneBytes : pb::IMessage<OneBytes> {
     private static readonly pb::MessageParser<OneBytes> _parser = new pb::MessageParser<OneBytes>(() => new OneBytes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<OneBytes> Parser { get { return _parser; } }
 
@@ -4091,6 +4314,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public OneBytes(OneBytes other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4123,13 +4347,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data.Length != 0) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4144,6 +4371,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteBytes(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4152,6 +4382,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeBytesSize(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4163,6 +4396,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data.Length != 0) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4171,7 +4405,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Data = input.ReadBytes();
@@ -4185,6 +4419,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class MoreBytes : pb::IMessage<MoreBytes> {
     private static readonly pb::MessageParser<MoreBytes> _parser = new pb::MessageParser<MoreBytes>(() => new MoreBytes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MoreBytes> Parser { get { return _parser; } }
 
@@ -4208,6 +4443,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public MoreBytes(MoreBytes other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4240,13 +4476,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data.Length != 0) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4261,6 +4500,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteBytes(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4269,6 +4511,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeBytesSize(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4280,6 +4525,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data.Length != 0) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4288,7 +4534,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Data = input.ReadBytes();
@@ -4305,6 +4551,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class Int32Message : pb::IMessage<Int32Message> {
     private static readonly pb::MessageParser<Int32Message> _parser = new pb::MessageParser<Int32Message>(() => new Int32Message());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Int32Message> Parser { get { return _parser; } }
 
@@ -4328,6 +4575,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Int32Message(Int32Message other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4360,13 +4608,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data != 0) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4381,6 +4632,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt32(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4389,6 +4643,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4400,6 +4657,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data != 0) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4408,7 +4666,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Data = input.ReadInt32();
@@ -4422,6 +4680,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class Uint32Message : pb::IMessage<Uint32Message> {
     private static readonly pb::MessageParser<Uint32Message> _parser = new pb::MessageParser<Uint32Message>(() => new Uint32Message());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Uint32Message> Parser { get { return _parser; } }
 
@@ -4445,6 +4704,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Uint32Message(Uint32Message other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4477,13 +4737,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data != 0) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4498,6 +4761,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteUInt32(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4506,6 +4772,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data != 0) {
         size += 1 + pb::CodedOutputStream.ComputeUInt32Size(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4517,6 +4786,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data != 0) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4525,7 +4795,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Data = input.ReadUInt32();
@@ -4539,6 +4809,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class Int64Message : pb::IMessage<Int64Message> {
     private static readonly pb::MessageParser<Int64Message> _parser = new pb::MessageParser<Int64Message>(() => new Int64Message());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Int64Message> Parser { get { return _parser; } }
 
@@ -4562,6 +4833,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Int64Message(Int64Message other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4594,13 +4866,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data != 0L) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4615,6 +4890,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteInt64(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4623,6 +4901,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data != 0L) {
         size += 1 + pb::CodedOutputStream.ComputeInt64Size(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4634,6 +4915,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data != 0L) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4642,7 +4924,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Data = input.ReadInt64();
@@ -4656,6 +4938,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class Uint64Message : pb::IMessage<Uint64Message> {
     private static readonly pb::MessageParser<Uint64Message> _parser = new pb::MessageParser<Uint64Message>(() => new Uint64Message());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Uint64Message> Parser { get { return _parser; } }
 
@@ -4679,6 +4962,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Uint64Message(Uint64Message other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4711,13 +4995,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data != 0UL) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4732,6 +5019,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteUInt64(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4740,6 +5030,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data != 0UL) {
         size += 1 + pb::CodedOutputStream.ComputeUInt64Size(Data);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4751,6 +5044,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data != 0UL) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4759,7 +5053,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Data = input.ReadUInt64();
@@ -4773,6 +5067,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class BoolMessage : pb::IMessage<BoolMessage> {
     private static readonly pb::MessageParser<BoolMessage> _parser = new pb::MessageParser<BoolMessage>(() => new BoolMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<BoolMessage> Parser { get { return _parser; } }
 
@@ -4796,6 +5091,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public BoolMessage(BoolMessage other) : this() {
       data_ = other.data_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4828,13 +5124,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (Data != other.Data) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Data != false) hash ^= Data.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4849,6 +5148,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(8);
         output.WriteBool(Data);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4857,6 +5159,9 @@ namespace Google.Protobuf.TestProtos {
       if (Data != false) {
         size += 1 + 1;
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4868,6 +5173,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.Data != false) {
         Data = other.Data;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4876,7 +5182,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Data = input.ReadBool();
@@ -4893,6 +5199,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestOneof : pb::IMessage<TestOneof> {
     private static readonly pb::MessageParser<TestOneof> _parser = new pb::MessageParser<TestOneof>(() => new TestOneof());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestOneof> Parser { get { return _parser; } }
 
@@ -4927,6 +5234,7 @@ namespace Google.Protobuf.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5004,7 +5312,7 @@ namespace Google.Protobuf.TestProtos {
       if (FooString != other.FooString) return false;
       if (!object.Equals(FooMessage, other.FooMessage)) return false;
       if (FooCase != other.FooCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5014,6 +5322,9 @@ namespace Google.Protobuf.TestProtos {
       if (fooCase_ == FooOneofCase.FooString) hash ^= FooString.GetHashCode();
       if (fooCase_ == FooOneofCase.FooMessage) hash ^= FooMessage.GetHashCode();
       hash ^= (int) fooCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5036,6 +5347,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(26);
         output.WriteMessage(FooMessage);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5050,6 +5364,9 @@ namespace Google.Protobuf.TestProtos {
       if (fooCase_ == FooOneofCase.FooMessage) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(FooMessage);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5066,10 +5383,14 @@ namespace Google.Protobuf.TestProtos {
           FooString = other.FooString;
           break;
         case FooOneofCase.FooMessage:
-          FooMessage = other.FooMessage;
+          if (FooMessage == null) {
+            FooMessage = new global::Google.Protobuf.TestProtos.TestAllTypes();
+          }
+          FooMessage.MergeFrom(other.FooMessage);
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5078,7 +5399,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             FooInt = input.ReadInt32();
@@ -5105,6 +5426,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestPackedTypes : pb::IMessage<TestPackedTypes> {
     private static readonly pb::MessageParser<TestPackedTypes> _parser = new pb::MessageParser<TestPackedTypes>(() => new TestPackedTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestPackedTypes> Parser { get { return _parser; } }
 
@@ -5141,6 +5463,7 @@ namespace Google.Protobuf.TestProtos {
       packedDouble_ = other.packedDouble_.Clone();
       packedBool_ = other.packedBool_.Clone();
       packedEnum_ = other.packedEnum_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5315,7 +5638,7 @@ namespace Google.Protobuf.TestProtos {
       if(!packedDouble_.Equals(other.packedDouble_)) return false;
       if(!packedBool_.Equals(other.packedBool_)) return false;
       if(!packedEnum_.Equals(other.packedEnum_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5335,6 +5658,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= packedDouble_.GetHashCode();
       hash ^= packedBool_.GetHashCode();
       hash ^= packedEnum_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5359,6 +5685,9 @@ namespace Google.Protobuf.TestProtos {
       packedDouble_.WriteTo(output, _repeated_packedDouble_codec);
       packedBool_.WriteTo(output, _repeated_packedBool_codec);
       packedEnum_.WriteTo(output, _repeated_packedEnum_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5378,6 +5707,9 @@ namespace Google.Protobuf.TestProtos {
       size += packedDouble_.CalculateSize(_repeated_packedDouble_codec);
       size += packedBool_.CalculateSize(_repeated_packedBool_codec);
       size += packedEnum_.CalculateSize(_repeated_packedEnum_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5400,6 +5732,7 @@ namespace Google.Protobuf.TestProtos {
       packedDouble_.Add(other.packedDouble_);
       packedBool_.Add(other.packedBool_);
       packedEnum_.Add(other.packedEnum_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5408,7 +5741,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 722:
           case 720: {
@@ -5492,6 +5825,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestUnpackedTypes : pb::IMessage<TestUnpackedTypes> {
     private static readonly pb::MessageParser<TestUnpackedTypes> _parser = new pb::MessageParser<TestUnpackedTypes>(() => new TestUnpackedTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestUnpackedTypes> Parser { get { return _parser; } }
 
@@ -5528,6 +5862,7 @@ namespace Google.Protobuf.TestProtos {
       unpackedDouble_ = other.unpackedDouble_.Clone();
       unpackedBool_ = other.unpackedBool_.Clone();
       unpackedEnum_ = other.unpackedEnum_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5702,7 +6037,7 @@ namespace Google.Protobuf.TestProtos {
       if(!unpackedDouble_.Equals(other.unpackedDouble_)) return false;
       if(!unpackedBool_.Equals(other.unpackedBool_)) return false;
       if(!unpackedEnum_.Equals(other.unpackedEnum_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5722,6 +6057,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= unpackedDouble_.GetHashCode();
       hash ^= unpackedBool_.GetHashCode();
       hash ^= unpackedEnum_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5746,6 +6084,9 @@ namespace Google.Protobuf.TestProtos {
       unpackedDouble_.WriteTo(output, _repeated_unpackedDouble_codec);
       unpackedBool_.WriteTo(output, _repeated_unpackedBool_codec);
       unpackedEnum_.WriteTo(output, _repeated_unpackedEnum_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5765,6 +6106,9 @@ namespace Google.Protobuf.TestProtos {
       size += unpackedDouble_.CalculateSize(_repeated_unpackedDouble_codec);
       size += unpackedBool_.CalculateSize(_repeated_unpackedBool_codec);
       size += unpackedEnum_.CalculateSize(_repeated_unpackedEnum_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5787,6 +6131,7 @@ namespace Google.Protobuf.TestProtos {
       unpackedDouble_.Add(other.unpackedDouble_);
       unpackedBool_.Add(other.unpackedBool_);
       unpackedEnum_.Add(other.unpackedEnum_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5795,7 +6140,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 722:
           case 720: {
@@ -5875,6 +6220,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestRepeatedScalarDifferentTagSizes : pb::IMessage<TestRepeatedScalarDifferentTagSizes> {
     private static readonly pb::MessageParser<TestRepeatedScalarDifferentTagSizes> _parser = new pb::MessageParser<TestRepeatedScalarDifferentTagSizes>(() => new TestRepeatedScalarDifferentTagSizes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestRepeatedScalarDifferentTagSizes> Parser { get { return _parser; } }
 
@@ -5903,6 +6249,7 @@ namespace Google.Protobuf.TestProtos {
       repeatedInt64_ = other.repeatedInt64_.Clone();
       repeatedFloat_ = other.repeatedFloat_.Clone();
       repeatedUint64_ = other.repeatedUint64_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6003,7 +6350,7 @@ namespace Google.Protobuf.TestProtos {
       if(!repeatedInt64_.Equals(other.repeatedInt64_)) return false;
       if(!repeatedFloat_.Equals(other.repeatedFloat_)) return false;
       if(!repeatedUint64_.Equals(other.repeatedUint64_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6015,6 +6362,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= repeatedInt64_.GetHashCode();
       hash ^= repeatedFloat_.GetHashCode();
       hash ^= repeatedUint64_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6031,6 +6381,9 @@ namespace Google.Protobuf.TestProtos {
       repeatedInt64_.WriteTo(output, _repeated_repeatedInt64_codec);
       repeatedFloat_.WriteTo(output, _repeated_repeatedFloat_codec);
       repeatedUint64_.WriteTo(output, _repeated_repeatedUint64_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6042,6 +6395,9 @@ namespace Google.Protobuf.TestProtos {
       size += repeatedInt64_.CalculateSize(_repeated_repeatedInt64_codec);
       size += repeatedFloat_.CalculateSize(_repeated_repeatedFloat_codec);
       size += repeatedUint64_.CalculateSize(_repeated_repeatedUint64_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6056,6 +6412,7 @@ namespace Google.Protobuf.TestProtos {
       repeatedInt64_.Add(other.repeatedInt64_);
       repeatedFloat_.Add(other.repeatedFloat_);
       repeatedUint64_.Add(other.repeatedUint64_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6064,7 +6421,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 98:
           case 101: {
@@ -6104,6 +6461,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class TestCommentInjectionMessage : pb::IMessage<TestCommentInjectionMessage> {
     private static readonly pb::MessageParser<TestCommentInjectionMessage> _parser = new pb::MessageParser<TestCommentInjectionMessage>(() => new TestCommentInjectionMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestCommentInjectionMessage> Parser { get { return _parser; } }
 
@@ -6127,6 +6485,7 @@ namespace Google.Protobuf.TestProtos {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestCommentInjectionMessage(TestCommentInjectionMessage other) : this() {
       a_ = other.a_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6162,13 +6521,16 @@ namespace Google.Protobuf.TestProtos {
         return true;
       }
       if (A != other.A) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (A.Length != 0) hash ^= A.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6183,6 +6545,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(10);
         output.WriteString(A);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6191,6 +6556,9 @@ namespace Google.Protobuf.TestProtos {
       if (A.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(A);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6202,6 +6570,7 @@ namespace Google.Protobuf.TestProtos {
       if (other.A.Length != 0) {
         A = other.A;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6210,7 +6579,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             A = input.ReadString();
@@ -6227,6 +6596,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class FooRequest : pb::IMessage<FooRequest> {
     private static readonly pb::MessageParser<FooRequest> _parser = new pb::MessageParser<FooRequest>(() => new FooRequest());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FooRequest> Parser { get { return _parser; } }
 
@@ -6249,6 +6619,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FooRequest(FooRequest other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6269,12 +6640,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6285,11 +6659,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6298,6 +6678,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6306,7 +6687,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -6316,6 +6697,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class FooResponse : pb::IMessage<FooResponse> {
     private static readonly pb::MessageParser<FooResponse> _parser = new pb::MessageParser<FooResponse>(() => new FooResponse());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FooResponse> Parser { get { return _parser; } }
 
@@ -6338,6 +6720,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FooResponse(FooResponse other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6358,12 +6741,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6374,11 +6760,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6387,6 +6779,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6395,7 +6788,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -6405,6 +6798,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class FooClientMessage : pb::IMessage<FooClientMessage> {
     private static readonly pb::MessageParser<FooClientMessage> _parser = new pb::MessageParser<FooClientMessage>(() => new FooClientMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FooClientMessage> Parser { get { return _parser; } }
 
@@ -6427,6 +6821,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FooClientMessage(FooClientMessage other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6447,12 +6842,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6463,11 +6861,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6476,6 +6880,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6484,7 +6889,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -6494,6 +6899,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class FooServerMessage : pb::IMessage<FooServerMessage> {
     private static readonly pb::MessageParser<FooServerMessage> _parser = new pb::MessageParser<FooServerMessage>(() => new FooServerMessage());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FooServerMessage> Parser { get { return _parser; } }
 
@@ -6516,6 +6922,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FooServerMessage(FooServerMessage other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6536,12 +6943,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6552,11 +6962,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6565,6 +6981,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6573,7 +6990,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -6583,6 +7000,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class BarRequest : pb::IMessage<BarRequest> {
     private static readonly pb::MessageParser<BarRequest> _parser = new pb::MessageParser<BarRequest>(() => new BarRequest());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<BarRequest> Parser { get { return _parser; } }
 
@@ -6605,6 +7023,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public BarRequest(BarRequest other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6625,12 +7044,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6641,11 +7063,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6654,6 +7082,7 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6662,7 +7091,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
@@ -6672,6 +7101,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class BarResponse : pb::IMessage<BarResponse> {
     private static readonly pb::MessageParser<BarResponse> _parser = new pb::MessageParser<BarResponse>(() => new BarResponse());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<BarResponse> Parser { get { return _parser; } }
 
@@ -6694,6 +7124,7 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public BarResponse(BarResponse other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6714,12 +7145,15 @@ namespace Google.Protobuf.TestProtos {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -6730,11 +7164,17 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -6743,6 +7183,108 @@ namespace Google.Protobuf.TestProtos {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+        }
+      }
+    }
+
+  }
+
+  public sealed partial class TestEmptyMessage : pb::IMessage<TestEmptyMessage> {
+    private static readonly pb::MessageParser<TestEmptyMessage> _parser = new pb::MessageParser<TestEmptyMessage>(() => new TestEmptyMessage());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<TestEmptyMessage> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Protobuf.TestProtos.UnittestProto3Reflection.Descriptor.MessageTypes[34]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public TestEmptyMessage() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public TestEmptyMessage(TestEmptyMessage other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public TestEmptyMessage Clone() {
+      return new TestEmptyMessage(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as TestEmptyMessage);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(TestEmptyMessage other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(TestEmptyMessage other) {
+      if (other == null) {
+        return;
+      }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6751,7 +7293,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
index 2c7f0e0e..fe913802 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/unittest_well_known_types.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/unittest_well_known_types.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -179,6 +181,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class TestWellKnownTypes : pb::IMessage<TestWellKnownTypes> {
     private static readonly pb::MessageParser<TestWellKnownTypes> _parser = new pb::MessageParser<TestWellKnownTypes>(() => new TestWellKnownTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<TestWellKnownTypes> Parser { get { return _parser; } }
 
@@ -201,15 +204,15 @@ namespace Google.Protobuf.TestProtos {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public TestWellKnownTypes(TestWellKnownTypes other) : this() {
-      AnyField = other.anyField_ != null ? other.AnyField.Clone() : null;
-      ApiField = other.apiField_ != null ? other.ApiField.Clone() : null;
-      DurationField = other.durationField_ != null ? other.DurationField.Clone() : null;
-      EmptyField = other.emptyField_ != null ? other.EmptyField.Clone() : null;
-      FieldMaskField = other.fieldMaskField_ != null ? other.FieldMaskField.Clone() : null;
-      SourceContextField = other.sourceContextField_ != null ? other.SourceContextField.Clone() : null;
-      StructField = other.structField_ != null ? other.StructField.Clone() : null;
-      TimestampField = other.timestampField_ != null ? other.TimestampField.Clone() : null;
-      TypeField = other.typeField_ != null ? other.TypeField.Clone() : null;
+      anyField_ = other.anyField_ != null ? other.anyField_.Clone() : null;
+      apiField_ = other.apiField_ != null ? other.apiField_.Clone() : null;
+      durationField_ = other.durationField_ != null ? other.durationField_.Clone() : null;
+      emptyField_ = other.emptyField_ != null ? other.emptyField_.Clone() : null;
+      fieldMaskField_ = other.fieldMaskField_ != null ? other.fieldMaskField_.Clone() : null;
+      sourceContextField_ = other.sourceContextField_ != null ? other.sourceContextField_.Clone() : null;
+      structField_ = other.structField_ != null ? other.structField_.Clone() : null;
+      timestampField_ = other.timestampField_ != null ? other.timestampField_.Clone() : null;
+      typeField_ = other.typeField_ != null ? other.typeField_.Clone() : null;
       DoubleField = other.DoubleField;
       FloatField = other.FloatField;
       Int64Field = other.Int64Field;
@@ -219,7 +222,8 @@ namespace Google.Protobuf.TestProtos {
       BoolField = other.BoolField;
       StringField = other.StringField;
       BytesField = other.BytesField;
-      ValueField = other.valueField_ != null ? other.ValueField.Clone() : null;
+      valueField_ = other.valueField_ != null ? other.valueField_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -470,8 +474,8 @@ namespace Google.Protobuf.TestProtos {
       if (!object.Equals(StructField, other.StructField)) return false;
       if (!object.Equals(TimestampField, other.TimestampField)) return false;
       if (!object.Equals(TypeField, other.TypeField)) return false;
-      if (DoubleField != other.DoubleField) return false;
-      if (FloatField != other.FloatField) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.Equals(DoubleField, other.DoubleField)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.Equals(FloatField, other.FloatField)) return false;
       if (Int64Field != other.Int64Field) return false;
       if (Uint64Field != other.Uint64Field) return false;
       if (Int32Field != other.Int32Field) return false;
@@ -480,7 +484,7 @@ namespace Google.Protobuf.TestProtos {
       if (StringField != other.StringField) return false;
       if (BytesField != other.BytesField) return false;
       if (!object.Equals(ValueField, other.ValueField)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -495,8 +499,8 @@ namespace Google.Protobuf.TestProtos {
       if (structField_ != null) hash ^= StructField.GetHashCode();
       if (timestampField_ != null) hash ^= TimestampField.GetHashCode();
       if (typeField_ != null) hash ^= TypeField.GetHashCode();
-      if (doubleField_ != null) hash ^= DoubleField.GetHashCode();
-      if (floatField_ != null) hash ^= FloatField.GetHashCode();
+      if (doubleField_ != null) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.GetHashCode(DoubleField);
+      if (floatField_ != null) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.GetHashCode(FloatField);
       if (int64Field_ != null) hash ^= Int64Field.GetHashCode();
       if (uint64Field_ != null) hash ^= Uint64Field.GetHashCode();
       if (int32Field_ != null) hash ^= Int32Field.GetHashCode();
@@ -505,6 +509,9 @@ namespace Google.Protobuf.TestProtos {
       if (stringField_ != null) hash ^= StringField.GetHashCode();
       if (bytesField_ != null) hash ^= BytesField.GetHashCode();
       if (valueField_ != null) hash ^= ValueField.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -582,6 +589,9 @@ namespace Google.Protobuf.TestProtos {
         output.WriteRawTag(154, 1);
         output.WriteMessage(ValueField);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -644,6 +654,9 @@ namespace Google.Protobuf.TestProtos {
       if (valueField_ != null) {
         size += 2 + pb::CodedOutputStream.ComputeMessageSize(ValueField);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -757,6 +770,7 @@ namespace Google.Protobuf.TestProtos {
         }
         ValueField.MergeFrom(other.ValueField);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -765,7 +779,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             if (anyField_ == null) {
@@ -911,6 +925,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class RepeatedWellKnownTypes : pb::IMessage<RepeatedWellKnownTypes> {
     private static readonly pb::MessageParser<RepeatedWellKnownTypes> _parser = new pb::MessageParser<RepeatedWellKnownTypes>(() => new RepeatedWellKnownTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<RepeatedWellKnownTypes> Parser { get { return _parser; } }
 
@@ -951,6 +966,7 @@ namespace Google.Protobuf.TestProtos {
       boolField_ = other.boolField_.Clone();
       stringField_ = other.stringField_.Clone();
       bytesField_ = other.bytesField_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1172,7 +1188,7 @@ namespace Google.Protobuf.TestProtos {
       if(!boolField_.Equals(other.boolField_)) return false;
       if(!stringField_.Equals(other.stringField_)) return false;
       if(!bytesField_.Equals(other.bytesField_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1196,6 +1212,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= boolField_.GetHashCode();
       hash ^= stringField_.GetHashCode();
       hash ^= bytesField_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1224,6 +1243,9 @@ namespace Google.Protobuf.TestProtos {
       boolField_.WriteTo(output, _repeated_boolField_codec);
       stringField_.WriteTo(output, _repeated_stringField_codec);
       bytesField_.WriteTo(output, _repeated_bytesField_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1247,6 +1269,9 @@ namespace Google.Protobuf.TestProtos {
       size += boolField_.CalculateSize(_repeated_boolField_codec);
       size += stringField_.CalculateSize(_repeated_stringField_codec);
       size += bytesField_.CalculateSize(_repeated_bytesField_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1273,6 +1298,7 @@ namespace Google.Protobuf.TestProtos {
       boolField_.Add(other.boolField_);
       stringField_.Add(other.stringField_);
       bytesField_.Add(other.bytesField_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1281,7 +1307,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             anyField_.AddEntriesFrom(input, _repeated_anyField_codec);
@@ -1363,6 +1389,7 @@ namespace Google.Protobuf.TestProtos {
 
   public sealed partial class OneofWellKnownTypes : pb::IMessage<OneofWellKnownTypes> {
     private static readonly pb::MessageParser<OneofWellKnownTypes> _parser = new pb::MessageParser<OneofWellKnownTypes>(() => new OneofWellKnownTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<OneofWellKnownTypes> Parser { get { return _parser; } }
 
@@ -1442,6 +1469,7 @@ namespace Google.Protobuf.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1713,8 +1741,8 @@ namespace Google.Protobuf.TestProtos {
       if (!object.Equals(StructField, other.StructField)) return false;
       if (!object.Equals(TimestampField, other.TimestampField)) return false;
       if (!object.Equals(TypeField, other.TypeField)) return false;
-      if (DoubleField != other.DoubleField) return false;
-      if (FloatField != other.FloatField) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.Equals(DoubleField, other.DoubleField)) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.Equals(FloatField, other.FloatField)) return false;
       if (Int64Field != other.Int64Field) return false;
       if (Uint64Field != other.Uint64Field) return false;
       if (Int32Field != other.Int32Field) return false;
@@ -1723,7 +1751,7 @@ namespace Google.Protobuf.TestProtos {
       if (StringField != other.StringField) return false;
       if (BytesField != other.BytesField) return false;
       if (OneofFieldCase != other.OneofFieldCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1738,8 +1766,8 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.StructField) hash ^= StructField.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.TimestampField) hash ^= TimestampField.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.TypeField) hash ^= TypeField.GetHashCode();
-      if (oneofFieldCase_ == OneofFieldOneofCase.DoubleField) hash ^= DoubleField.GetHashCode();
-      if (oneofFieldCase_ == OneofFieldOneofCase.FloatField) hash ^= FloatField.GetHashCode();
+      if (oneofFieldCase_ == OneofFieldOneofCase.DoubleField) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.GetHashCode(DoubleField);
+      if (oneofFieldCase_ == OneofFieldOneofCase.FloatField) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.GetHashCode(FloatField);
       if (oneofFieldCase_ == OneofFieldOneofCase.Int64Field) hash ^= Int64Field.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.Uint64Field) hash ^= Uint64Field.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.Int32Field) hash ^= Int32Field.GetHashCode();
@@ -1748,6 +1776,9 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.StringField) hash ^= StringField.GetHashCode();
       if (oneofFieldCase_ == OneofFieldOneofCase.BytesField) hash ^= BytesField.GetHashCode();
       hash ^= (int) oneofFieldCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1821,6 +1852,9 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.BytesField) {
         _oneof_bytesField_codec.WriteTagAndValue(output, (pb::ByteString) oneofField_);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1880,6 +1914,9 @@ namespace Google.Protobuf.TestProtos {
       if (oneofFieldCase_ == OneofFieldOneofCase.BytesField) {
         size += _oneof_bytesField_codec.CalculateSizeWithTag(BytesField);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1890,31 +1927,58 @@ namespace Google.Protobuf.TestProtos {
       }
       switch (other.OneofFieldCase) {
         case OneofFieldOneofCase.AnyField:
-          AnyField = other.AnyField;
+          if (AnyField == null) {
+            AnyField = new global::Google.Protobuf.WellKnownTypes.Any();
+          }
+          AnyField.MergeFrom(other.AnyField);
           break;
         case OneofFieldOneofCase.ApiField:
-          ApiField = other.ApiField;
+          if (ApiField == null) {
+            ApiField = new global::Google.Protobuf.WellKnownTypes.Api();
+          }
+          ApiField.MergeFrom(other.ApiField);
           break;
         case OneofFieldOneofCase.DurationField:
-          DurationField = other.DurationField;
+          if (DurationField == null) {
+            DurationField = new global::Google.Protobuf.WellKnownTypes.Duration();
+          }
+          DurationField.MergeFrom(other.DurationField);
           break;
         case OneofFieldOneofCase.EmptyField:
-          EmptyField = other.EmptyField;
+          if (EmptyField == null) {
+            EmptyField = new global::Google.Protobuf.WellKnownTypes.Empty();
+          }
+          EmptyField.MergeFrom(other.EmptyField);
           break;
         case OneofFieldOneofCase.FieldMaskField:
-          FieldMaskField = other.FieldMaskField;
+          if (FieldMaskField == null) {
+            FieldMaskField = new global::Google.Protobuf.WellKnownTypes.FieldMask();
+          }
+          FieldMaskField.MergeFrom(other.FieldMaskField);
           break;
         case OneofFieldOneofCase.SourceContextField:
-          SourceContextField = other.SourceContextField;
+          if (SourceContextField == null) {
+            SourceContextField = new global::Google.Protobuf.WellKnownTypes.SourceContext();
+          }
+          SourceContextField.MergeFrom(other.SourceContextField);
           break;
         case OneofFieldOneofCase.StructField:
-          StructField = other.StructField;
+          if (StructField == null) {
+            StructField = new global::Google.Protobuf.WellKnownTypes.Struct();
+          }
+          StructField.MergeFrom(other.StructField);
           break;
         case OneofFieldOneofCase.TimestampField:
-          TimestampField = other.TimestampField;
+          if (TimestampField == null) {
+            TimestampField = new global::Google.Protobuf.WellKnownTypes.Timestamp();
+          }
+          TimestampField.MergeFrom(other.TimestampField);
           break;
         case OneofFieldOneofCase.TypeField:
-          TypeField = other.TypeField;
+          if (TypeField == null) {
+            TypeField = new global::Google.Protobuf.WellKnownTypes.Type();
+          }
+          TypeField.MergeFrom(other.TypeField);
           break;
         case OneofFieldOneofCase.DoubleField:
           DoubleField = other.DoubleField;
@@ -1945,6 +2009,7 @@ namespace Google.Protobuf.TestProtos {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1953,7 +2018,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             global::Google.Protobuf.WellKnownTypes.Any subBuilder = new global::Google.Protobuf.WellKnownTypes.Any();
@@ -2085,6 +2150,7 @@ namespace Google.Protobuf.TestProtos {
   /// </summary>
   public sealed partial class MapWellKnownTypes : pb::IMessage<MapWellKnownTypes> {
     private static readonly pb::MessageParser<MapWellKnownTypes> _parser = new pb::MessageParser<MapWellKnownTypes>(() => new MapWellKnownTypes());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MapWellKnownTypes> Parser { get { return _parser; } }
 
@@ -2125,6 +2191,7 @@ namespace Google.Protobuf.TestProtos {
       boolField_ = other.boolField_.Clone();
       stringField_ = other.stringField_.Clone();
       bytesField_ = other.bytesField_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2343,7 +2410,7 @@ namespace Google.Protobuf.TestProtos {
       if (!BoolField.Equals(other.BoolField)) return false;
       if (!StringField.Equals(other.StringField)) return false;
       if (!BytesField.Equals(other.BytesField)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2367,6 +2434,9 @@ namespace Google.Protobuf.TestProtos {
       hash ^= BoolField.GetHashCode();
       hash ^= StringField.GetHashCode();
       hash ^= BytesField.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2395,6 +2465,9 @@ namespace Google.Protobuf.TestProtos {
       boolField_.WriteTo(output, _map_boolField_codec);
       stringField_.WriteTo(output, _map_stringField_codec);
       bytesField_.WriteTo(output, _map_bytesField_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2418,6 +2491,9 @@ namespace Google.Protobuf.TestProtos {
       size += boolField_.CalculateSize(_map_boolField_codec);
       size += stringField_.CalculateSize(_map_stringField_codec);
       size += bytesField_.CalculateSize(_map_bytesField_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2444,6 +2520,7 @@ namespace Google.Protobuf.TestProtos {
       boolField_.Add(other.boolField_);
       stringField_.Add(other.stringField_);
       bytesField_.Add(other.bytesField_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2452,7 +2529,7 @@ namespace Google.Protobuf.TestProtos {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             anyField_.AddEntriesFrom(input, _map_anyField_codec);
diff --git a/csharp/src/Google.Protobuf.Test/UnknownFieldSetTest.cs b/csharp/src/Google.Protobuf.Test/UnknownFieldSetTest.cs
new file mode 100644
index 00000000..ddf62321
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/UnknownFieldSetTest.cs
@@ -0,0 +1,176 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.IO;
+using Google.Protobuf.TestProtos;
+using NUnit.Framework;
+
+namespace Google.Protobuf
+{
+    public class UnknownFieldSetTest
+    {
+        [Test]
+        public void EmptyUnknownFieldSet()
+        {
+            UnknownFieldSet unknownFields = new UnknownFieldSet();
+            Assert.AreEqual(0, unknownFields.CalculateSize());
+        }
+
+        [Test]
+        public void MergeUnknownFieldSet()
+        {
+            UnknownFieldSet unknownFields = new UnknownFieldSet();
+            UnknownField field = new UnknownField();
+            field.AddFixed32(123);
+            unknownFields.AddOrReplaceField(1, field);
+            UnknownFieldSet otherUnknownFields = new UnknownFieldSet();
+            Assert.IsFalse(otherUnknownFields.HasField(1));
+            UnknownFieldSet.MergeFrom(otherUnknownFields, unknownFields);
+            Assert.IsTrue(otherUnknownFields.HasField(1));
+        }
+
+        [Test]
+        public void TestMergeCodedInput()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var emptyMessage = new TestEmptyMessage();
+            emptyMessage.MergeFrom(message.ToByteArray());
+            Assert.AreEqual(message.CalculateSize(), emptyMessage.CalculateSize());
+            Assert.AreEqual(message.ToByteArray(), emptyMessage.ToByteArray());
+
+            var newMessage = new TestAllTypes();
+            newMessage.MergeFrom(emptyMessage.ToByteArray());
+            Assert.AreEqual(message, newMessage);
+            Assert.AreEqual(message.CalculateSize(), newMessage.CalculateSize());
+        }
+
+        [Test]
+        public void TestMergeMessage()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var emptyMessage = new TestEmptyMessage();
+            var otherEmptyMessage = new TestEmptyMessage();
+            emptyMessage.MergeFrom(message.ToByteArray());
+            otherEmptyMessage.MergeFrom(emptyMessage);
+
+            Assert.AreEqual(message.CalculateSize(), otherEmptyMessage.CalculateSize());
+            Assert.AreEqual(message.ToByteArray(), otherEmptyMessage.ToByteArray());
+        }
+
+        [Test]
+        public void TestEquals()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var emptyMessage = new TestEmptyMessage();
+            var otherEmptyMessage = new TestEmptyMessage();
+            Assert.AreEqual(emptyMessage, otherEmptyMessage);
+            emptyMessage.MergeFrom(message.ToByteArray());
+            Assert.AreNotEqual(emptyMessage.CalculateSize(),
+                               otherEmptyMessage.CalculateSize());
+            Assert.AreNotEqual(emptyMessage, otherEmptyMessage);
+        }
+
+        [Test]
+        public void TestHashCode()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var emptyMessage = new TestEmptyMessage();
+            int hashCode = emptyMessage.GetHashCode();
+            emptyMessage.MergeFrom(message.ToByteArray());
+            Assert.AreNotEqual(hashCode, emptyMessage.GetHashCode());
+        }
+
+        [Test]
+        public void TestClone()
+        {
+            var emptyMessage = new TestEmptyMessage();
+            var otherEmptyMessage = new TestEmptyMessage();
+            otherEmptyMessage = emptyMessage.Clone();
+            Assert.AreEqual(emptyMessage.CalculateSize(), otherEmptyMessage.CalculateSize());
+            Assert.AreEqual(emptyMessage.ToByteArray(), otherEmptyMessage.ToByteArray());
+
+            var message = SampleMessages.CreateFullTestAllTypes();
+            emptyMessage.MergeFrom(message.ToByteArray());
+            otherEmptyMessage = emptyMessage.Clone();
+            Assert.AreEqual(message.CalculateSize(), otherEmptyMessage.CalculateSize());
+            Assert.AreEqual(message.ToByteArray(), otherEmptyMessage.ToByteArray());
+        }
+
+        [Test]
+        public void TestDiscardUnknownFields()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var goldenEmptyMessage = new TestEmptyMessage();
+            byte[] data = message.ToByteArray();
+            int fullSize = message.CalculateSize();
+
+            Action<IMessage> assertEmpty = msg =>
+            {
+                Assert.AreEqual(0, msg.CalculateSize());
+                Assert.AreEqual(goldenEmptyMessage, msg);
+            };
+
+            Action<IMessage> assertFull = msg => Assert.AreEqual(fullSize, msg.CalculateSize());
+
+            // Test the behavior of the parsers with and without discarding, both generic and non-generic.
+            MessageParser<TestEmptyMessage> retainingParser1 = TestEmptyMessage.Parser;
+            MessageParser retainingParser2 = retainingParser1;
+            MessageParser<TestEmptyMessage> discardingParser1 = retainingParser1.WithDiscardUnknownFields(true);
+            MessageParser discardingParser2 = retainingParser2.WithDiscardUnknownFields(true);
+
+            // Test parse from byte[]
+            assertFull(retainingParser1.ParseFrom(data));
+            assertFull(retainingParser2.ParseFrom(data));
+            assertEmpty(discardingParser1.ParseFrom(data));
+            assertEmpty(discardingParser2.ParseFrom(data));
+
+            // Test parse from byte[] with offset
+            assertFull(retainingParser1.ParseFrom(data, 0, data.Length));
+            assertFull(retainingParser2.ParseFrom(data, 0, data.Length));
+            assertEmpty(discardingParser1.ParseFrom(data, 0, data.Length));
+            assertEmpty(discardingParser2.ParseFrom(data, 0, data.Length));
+
+            // Test parse from CodedInputStream
+            assertFull(retainingParser1.ParseFrom(new CodedInputStream(data)));
+            assertFull(retainingParser2.ParseFrom(new CodedInputStream(data)));
+            assertEmpty(discardingParser1.ParseFrom(new CodedInputStream(data)));
+            assertEmpty(discardingParser2.ParseFrom(new CodedInputStream(data)));
+
+            // Test parse from Stream
+            assertFull(retainingParser1.ParseFrom(new MemoryStream(data)));
+            assertFull(retainingParser2.ParseFrom(new MemoryStream(data)));
+            assertEmpty(discardingParser1.ParseFrom(new MemoryStream(data)));
+            assertEmpty(discardingParser2.ParseFrom(new MemoryStream(data)));
+        }
+    }
+}
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
index 4aecc998..6ca1e1f0 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
@@ -42,7 +42,7 @@ namespace Google.Protobuf.WellKnownTypes
         {
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message);
-            Assert.AreEqual("type.googleapis.com/protobuf_unittest.TestAllTypes", any.TypeUrl);
+            Assert.AreEqual("type.googleapis.com/protobuf_unittest3.TestAllTypes", any.TypeUrl);
             Assert.AreEqual(message.CalculateSize(), any.Value.Length);
         }
 
@@ -51,7 +51,7 @@ namespace Google.Protobuf.WellKnownTypes
         {
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message, "foo.bar/baz");
-            Assert.AreEqual("foo.bar/baz/protobuf_unittest.TestAllTypes", any.TypeUrl);
+            Assert.AreEqual("foo.bar/baz/protobuf_unittest3.TestAllTypes", any.TypeUrl);
             Assert.AreEqual(message.CalculateSize(), any.Value.Length);
         }
 
@@ -60,7 +60,7 @@ namespace Google.Protobuf.WellKnownTypes
         {
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message, "foo.bar/baz/");
-            Assert.AreEqual("foo.bar/baz/protobuf_unittest.TestAllTypes", any.TypeUrl);
+            Assert.AreEqual("foo.bar/baz/protobuf_unittest3.TestAllTypes", any.TypeUrl);
             Assert.AreEqual(message.CalculateSize(), any.Value.Length);
         }
 
@@ -91,6 +91,24 @@ namespace Google.Protobuf.WellKnownTypes
         }
 
         [Test]
+        public void TryUnpack_WrongType()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var any = Any.Pack(message);
+            Assert.False(any.TryUnpack(out TestOneof unpacked));
+            Assert.Null(unpacked);
+        }
+
+        [Test]
+        public void TryUnpack_RightType()
+        {
+            var message = SampleMessages.CreateFullTestAllTypes();
+            var any = Any.Pack(message);
+            Assert.IsTrue(any.TryUnpack(out TestAllTypes unpacked));
+            Assert.AreEqual(message, unpacked);
+        }
+
+        [Test]
         public void ToString_WithValues()
         {
             var message = SampleMessages.CreateFullTestAllTypes();
@@ -100,6 +118,16 @@ namespace Google.Protobuf.WellKnownTypes
         }
 
         [Test]
+        [TestCase("proto://foo.bar", "foo.bar")]
+        [TestCase("/foo/bar/baz", "baz")]
+        [TestCase("foobar", "")]
+        public void GetTypeName(string typeUrl, string expectedTypeName)
+        {
+            var any = new Any { TypeUrl = typeUrl };
+            Assert.AreEqual(expectedTypeName, Any.GetTypeName(typeUrl));
+        }
+
+        [Test]
         public void ToString_Empty()
         {
             var any = new Any();
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
index 5b7185dc..8ed55744 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs
@@ -417,5 +417,16 @@ namespace Google.Protobuf.WellKnownTypes
             TestWellKnownTypes.Descriptor.Fields[TestWellKnownTypes.StringFieldFieldNumber].Accessor.Clear(message);
             Assert.IsNull(message.StringField);
         }
+
+        [Test]
+        public void NaNComparisons()
+        {
+            var message1 = new TestWellKnownTypes { DoubleField = SampleNaNs.Regular };
+            var message2 = new TestWellKnownTypes { DoubleField = SampleNaNs.PayloadFlipped };
+            var message3 = new TestWellKnownTypes { DoubleField = SampleNaNs.Regular };
+
+            EqualityTester.AssertInequality(message1, message2);
+            EqualityTester.AssertEquality(message1, message3);
+        }
     }
 }
diff --git a/csharp/src/Google.Protobuf.Test/project.json b/csharp/src/Google.Protobuf.Test/project.json
deleted file mode 100644
index eaa7f79d..00000000
--- a/csharp/src/Google.Protobuf.Test/project.json
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-  "buildOptions": {
-    "debugType": "portable",
-    "keyFile": "../../keys/Google.Protobuf.snk"
-  },
-
-  "configurations": {
-    "Debug": {
-      "buildOptions": {
-        "define": [ "DEBUG", "TRACE" ]
-      }
-    },
-    "Release": {
-      "buildOptions": {
-        "define": [ "RELEASE", "TRACE" ],
-        "optimize": true
-      }
-    }
-  },
-
-  "dependencies": {
-    "Google.Protobuf": { "target": "project" },
-    "dotnet-test-nunit": "3.4.0-beta-3",
-    "NUnit": "3.6.0"
-  },
-
-  "testRunner": "nunit",
-
-  "frameworks": {
-    "net451": {},
-    "netcoreapp1.0": {
-      "imports" : [ "dnxcore50", "netcoreapp1.0", "portable-net45+win8" ],
-      "buildOptions": {
-        "define": [ "PCL" ]
-      },
-      "dependencies": {
-        "Microsoft.NETCore.App": { 
-          "version": "1.0.0",
-          "type": "platform"
-        },
-        "System.Console": "4.0.0"
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.sln b/csharp/src/Google.Protobuf.sln
index 3c62bba3..443ee3e9 100644
--- a/csharp/src/Google.Protobuf.sln
+++ b/csharp/src/Google.Protobuf.sln
@@ -1,16 +1,16 @@
 Microsoft Visual Studio Solution File, Format Version 12.00

-# Visual Studio 14

-VisualStudioVersion = 14.0.25420.1

-MinimumVisualStudioVersion = 14.0.24720.0

-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "AddressBook", "AddressBook\AddressBook.xproj", "{AFB63919-1E05-43B4-802A-8FB8C9B2F463}"

+# Visual Studio 15

+VisualStudioVersion = 15.0.26114.2

+MinimumVisualStudioVersion = 10.0.40219.1

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AddressBook", "AddressBook\AddressBook.csproj", "{AFB63919-1E05-43B4-802A-8FB8C9B2F463}"

 EndProject

-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "Google.Protobuf", "Google.Protobuf\Google.Protobuf.xproj", "{9B576380-726D-4142-8238-60A43AB0E35A}"

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf", "Google.Protobuf\Google.Protobuf.csproj", "{9B576380-726D-4142-8238-60A43AB0E35A}"

 EndProject

-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "Google.Protobuf.Test", "Google.Protobuf.Test\Google.Protobuf.Test.xproj", "{580EB013-D3C7-4578-B845-015F4A3B0591}"

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf.Test", "Google.Protobuf.Test\Google.Protobuf.Test.csproj", "{580EB013-D3C7-4578-B845-015F4A3B0591}"

 EndProject

-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "Google.Protobuf.Conformance", "Google.Protobuf.Conformance\Google.Protobuf.Conformance.xproj", "{DDDC055B-E185-4181-BAB0-072F0F984569}"

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf.Conformance", "Google.Protobuf.Conformance\Google.Protobuf.Conformance.csproj", "{DDDC055B-E185-4181-BAB0-072F0F984569}"

 EndProject

-Project("{8BB2217D-0F2D-49D1-97BC-3654ED321F3B}") = "Google.Protobuf.JsonDump", "Google.Protobuf.JsonDump\Google.Protobuf.JsonDump.xproj", "{9695E08F-9829-497D-B95C-B38F28D48690}"

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Google.Protobuf.JsonDump", "Google.Protobuf.JsonDump\Google.Protobuf.JsonDump.csproj", "{9695E08F-9829-497D-B95C-B38F28D48690}"

 EndProject

 Global

 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

diff --git a/csharp/src/Google.Protobuf/CodedInputStream.cs b/csharp/src/Google.Protobuf/CodedInputStream.cs
index 072e2e17..0a829545 100644
--- a/csharp/src/Google.Protobuf/CodedInputStream.cs
+++ b/csharp/src/Google.Protobuf/CodedInputStream.cs
@@ -94,7 +94,7 @@ namespace Google.Protobuf
         private bool hasNextTag = false;

 

         internal const int DefaultRecursionLimit = 64;

-        internal const int DefaultSizeLimit = 64 << 20; // 64MB

+        internal const int DefaultSizeLimit = Int32.MaxValue;

         internal const int BufferSize = 4096;

 

         /// <summary>

@@ -121,7 +121,7 @@ namespace Google.Protobuf
         /// <summary>

         /// Creates a new CodedInputStream reading data from the given byte array.

         /// </summary>

-        public CodedInputStream(byte[] buffer) : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), 0, buffer.Length)

+        public CodedInputStream(byte[] buffer) : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), 0, buffer.Length, true)

         {            

         }

 

@@ -129,7 +129,7 @@ namespace Google.Protobuf
         /// Creates a new <see cref="CodedInputStream"/> that reads from the given byte array slice.

         /// </summary>

         public CodedInputStream(byte[] buffer, int offset, int length)

-            : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), offset, offset + length)

+            : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), offset, offset + length, true)

         {            

             if (offset < 0 || offset > buffer.Length)

             {

@@ -158,16 +158,15 @@ namespace Google.Protobuf
         /// <c cref="CodedInputStream"/> is disposed; <c>false</c> to dispose of the given stream when the

         /// returned object is disposed.</param>

         public CodedInputStream(Stream input, bool leaveOpen)

-            : this(ProtoPreconditions.CheckNotNull(input, "input"), new byte[BufferSize], 0, 0)

+            : this(ProtoPreconditions.CheckNotNull(input, "input"), new byte[BufferSize], 0, 0, leaveOpen)

         {

-            this.leaveOpen = leaveOpen;

         }

         

         /// <summary>

         /// Creates a new CodedInputStream reading data from the given

         /// stream and buffer, using the default limits.

         /// </summary>

-        internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize)

+        internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize, bool leaveOpen)

         {

             this.input = input;

             this.buffer = buffer;

@@ -175,6 +174,7 @@ namespace Google.Protobuf
             this.bufferSize = bufferSize;

             this.sizeLimit = DefaultSizeLimit;

             this.recursionLimit = DefaultRecursionLimit;

+            this.leaveOpen = leaveOpen;

         }

 

         /// <summary>

@@ -185,8 +185,8 @@ namespace Google.Protobuf
         /// This chains to the version with the default limits instead of vice versa to avoid

         /// having to check that the default values are valid every time.

         /// </remarks>

-        internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize, int sizeLimit, int recursionLimit)

-            : this(input, buffer, bufferPos, bufferSize)

+        internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize, int sizeLimit, int recursionLimit, bool leaveOpen)

+            : this(input, buffer, bufferPos, bufferSize, leaveOpen)

         {

             if (sizeLimit <= 0)

             {

@@ -217,7 +217,8 @@ namespace Google.Protobuf
         /// and recursion limits.</returns>

         public static CodedInputStream CreateWithLimits(Stream input, int sizeLimit, int recursionLimit)

         {

-            return new CodedInputStream(input, new byte[BufferSize], 0, 0, sizeLimit, recursionLimit);

+            // Note: we may want an overload accepting leaveOpen

+            return new CodedInputStream(input, new byte[BufferSize], 0, 0, sizeLimit, recursionLimit, false);

         }

 

         /// <summary>

@@ -247,7 +248,7 @@ namespace Google.Protobuf
         /// <remarks>

         /// This limit is applied when reading from the underlying stream, as a sanity check. It is

         /// not applied when reading from a byte array data source without an underlying stream.

-        /// The default value is 64MB.

+        /// The default value is Int32.MaxValue.

         /// </remarks>

         /// <value>

         /// The size limit.

@@ -267,6 +268,11 @@ namespace Google.Protobuf
         public int RecursionLimit { get { return recursionLimit; } }

 

         /// <summary>

+        /// Internal-only property; when set to true, unknown fields will be discarded while parsing.

+        /// </summary>

+        internal bool DiscardUnknownFields { get; set; }

+

+        /// <summary>

         /// Disposes of this instance, potentially closing any underlying stream.

         /// </summary>

         /// <remarks>

@@ -372,9 +378,9 @@ namespace Google.Protobuf
 

                 lastTag = ReadRawVarint32();

             }

-            if (lastTag == 0)

+            if (WireFormat.GetTagFieldNumber(lastTag) == 0)

             {

-                // If we actually read zero, that's not a valid tag.

+                // If we actually read a tag with a field of 0, that's not a valid tag.

                 throw InvalidProtocolBufferException.InvalidTag();

             }

             return lastTag;

@@ -423,7 +429,10 @@ namespace Google.Protobuf
             }

         }

 

-        private void SkipGroup(uint startGroupTag)

+        /// <summary>

+        /// Skip a group.

+        /// </summary>

+        internal void SkipGroup(uint startGroupTag)

         {

             // Note: Currently we expect this to be the way that groups are read. We could put the recursion

             // depth changes into the ReadTag method instead, potentially...

@@ -1049,7 +1058,7 @@ namespace Google.Protobuf
                 RecomputeBufferSizeAfterLimit();

                 int totalBytesRead =

                     totalBytesRetired + bufferSize + bufferSizeAfterLimit;

-                if (totalBytesRead > sizeLimit || totalBytesRead < 0)

+                if (totalBytesRead < 0 || totalBytesRead > sizeLimit)

                 {

                     throw InvalidProtocolBufferException.SizeLimitExceeded();

                 }

@@ -1269,7 +1278,6 @@ namespace Google.Protobuf
                 }

             }

         }

-

         #endregion

     }

 }
\ No newline at end of file
diff --git a/javanano/src/test/java/com/google/protobuf/nano/map_test.proto b/csharp/src/Google.Protobuf/Collections/Lists.cs
index 51498a49..860795ce 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/map_test.proto
+++ b/csharp/src/Google.Protobuf/Collections/Lists.cs
@@ -1,5 +1,6 @@
+#region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
+// Copyright 2017 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -27,44 +28,62 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
 
-syntax = "proto3";
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
 
-package map_test;
+namespace Google.Protobuf.Collections
+{
+    /// <summary>
+    /// Utility to compare if two Lists are the same, and the hash code
+    /// of a List.
+    /// </summary>
+    public static class Lists
+    {
+        /// <summary>
+        /// Checks if two lists are equal.
+        /// </summary>
+        public static bool Equals<T>(List<T> left, List<T> right)
+        {
+            if (left == right)
+            {
+                return true;
+            }
+            if (left == null || right == null)
+            {
+                return false;
+            }
+            if (left.Count != right.Count)
+            {
+                return false;
+            }
+            IEqualityComparer<T> comparer = EqualityComparer<T>.Default;
+            for (int i = 0; i < left.Count; i++)
+            {
+                if (!comparer.Equals(left[i], right[i]))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
 
-option java_package = "com.google.protobuf";
-option java_outer_classname = "MapTestProto";
-
-message TestMap {
-  message MessageValue {
-    int32 value = 1;
-    int32 value2 = 2;
-  }
-  enum EnumValue {
-    FOO = 0;
-    BAR = 1;
-    BAZ = 2;
-    QUX = 3;
-  }
-
-  map<int32, int32>        int32_to_int32_field = 1;
-  map<int32, string>       int32_to_string_field = 2;
-  map<int32, bytes>        int32_to_bytes_field = 3;
-  map<int32, EnumValue>    int32_to_enum_field = 4;
-  map<int32, MessageValue> int32_to_message_field = 5;
-  map<string, int32>       string_to_int32_field = 6;
-  map<bool, bool>          bool_to_bool_field = 7;
-
-  // Test all the other primitive types. As the key and value are not coupled in
-  // the implementation, we do not test all the combinations of key/value pairs,
-  // so that we can keep the number of test cases manageable
-  map<uint32, uint32>      uint32_to_uint32_field = 11;
-  map<sint32, sint32>      sint32_to_sint32_field = 12;
-  map<fixed32, fixed32>    fixed32_to_fixed32_field = 13;
-  map<sfixed32, sfixed32>  sfixed32_to_sfixed32_field = 14;
-  map<int64, int64>        int64_to_int64_field = 15;
-  map<uint64, uint64>      uint64_to_uint64_field = 16;
-  map<sint64, sint64>      sint64_to_sint64_field = 17;
-  map<fixed64, fixed64>    fixed64_to_fixed64_field = 18;
-  map<sfixed64, sfixed64>  sfixed64_to_sfixed64_field = 19;
-}
+        /// <summary>
+        /// Gets the list's hash code.
+        /// </summary>
+        public static int GetHashCode<T>(List<T> list)
+        {
+            if (list == null)
+            {
+                return 0;
+            }
+            int hash = 31;
+            foreach (T element in list)
+            {
+                hash = hash * 29 + element.GetHashCode();
+            }
+            return hash;
+        }
+    }
+}
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf/Collections/MapField.cs b/csharp/src/Google.Protobuf/Collections/MapField.cs
index ef5651c9..dbbcc148 100644
--- a/csharp/src/Google.Protobuf/Collections/MapField.cs
+++ b/csharp/src/Google.Protobuf/Collections/MapField.cs
@@ -67,10 +67,16 @@ namespace Google.Protobuf.Collections
     /// </para>
     /// </remarks>
     public sealed class MapField<TKey, TValue> : IDeepCloneable<MapField<TKey, TValue>>, IDictionary<TKey, TValue>, IEquatable<MapField<TKey, TValue>>, IDictionary
+#if !NET35
+        , IReadOnlyDictionary<TKey, TValue>
+#endif
     {
+        private static readonly EqualityComparer<TValue> ValueEqualityComparer = ProtobufEqualityComparers.GetEqualityComparer<TValue>();
+        private static readonly EqualityComparer<TKey> KeyEqualityComparer = ProtobufEqualityComparers.GetEqualityComparer<TKey>();
+
         // TODO: Don't create the map/list until we have an entry. (Assume many maps will be empty.)
         private readonly Dictionary<TKey, LinkedListNode<KeyValuePair<TKey, TValue>>> map =
-            new Dictionary<TKey, LinkedListNode<KeyValuePair<TKey, TValue>>>();
+            new Dictionary<TKey, LinkedListNode<KeyValuePair<TKey, TValue>>>(KeyEqualityComparer);
         private readonly LinkedList<KeyValuePair<TKey, TValue>> list = new LinkedList<KeyValuePair<TKey, TValue>>();
 
         /// <summary>
@@ -128,11 +134,8 @@ namespace Google.Protobuf.Collections
             return map.ContainsKey(key);
         }
 
-        private bool ContainsValue(TValue value)
-        {
-            var comparer = EqualityComparer<TValue>.Default;
-            return list.Any(pair => comparer.Equals(pair.Value, value));
-        }
+        private bool ContainsValue(TValue value) =>
+            list.Any(pair => ValueEqualityComparer.Equals(pair.Value, value));
 
         /// <summary>
         /// Removes the entry identified by the given key from the map.
@@ -290,8 +293,7 @@ namespace Google.Protobuf.Collections
         bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> item)
         {
             TValue value;
-            return TryGetValue(item.Key, out value)
-                && EqualityComparer<TValue>.Default.Equals(item.Value, value);
+            return TryGetValue(item.Key, out value) && ValueEqualityComparer.Equals(item.Value, value);
         }
 
         /// <summary>
@@ -360,11 +362,12 @@ namespace Google.Protobuf.Collections
         /// </returns>
         public override int GetHashCode()
         {
-            var valueComparer = EqualityComparer<TValue>.Default;
+            var keyComparer = KeyEqualityComparer;
+            var valueComparer = ValueEqualityComparer;
             int hash = 0;
             foreach (var pair in list)
             {
-                hash ^= pair.Key.GetHashCode() * 31 + valueComparer.GetHashCode(pair.Value);
+                hash ^= keyComparer.GetHashCode(pair.Key) * 31 + valueComparer.GetHashCode(pair.Value);
             }
             return hash;
         }
@@ -391,7 +394,7 @@ namespace Google.Protobuf.Collections
             {
                 return false;
             }
-            var valueComparer = EqualityComparer<TValue>.Default;
+            var valueComparer = ValueEqualityComparer;
             foreach (var pair in this)
             {
                 TValue value;
@@ -548,6 +551,14 @@ namespace Google.Protobuf.Collections
         }
         #endregion
 
+        #region IReadOnlyDictionary explicit interface implementation
+#if !NET35
+        IEnumerable<TKey> IReadOnlyDictionary<TKey, TValue>.Keys => Keys;
+
+        IEnumerable<TValue> IReadOnlyDictionary<TKey, TValue>.Values => Values;
+#endif
+        #endregion
+
         private class DictionaryEnumerator : IDictionaryEnumerator
         {
             private readonly IEnumerator<KeyValuePair<TKey, TValue>> enumerator;
diff --git a/csharp/src/Google.Protobuf/Collections/ProtobufEqualityComparers.cs b/csharp/src/Google.Protobuf/Collections/ProtobufEqualityComparers.cs
new file mode 100644
index 00000000..13ef60fc
--- /dev/null
+++ b/csharp/src/Google.Protobuf/Collections/ProtobufEqualityComparers.cs
@@ -0,0 +1,130 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+namespace Google.Protobuf.Collections
+{
+    /// <summary>
+    /// Provides a central place to implement equality comparisons, primarily for bitwise float/double equality.
+    /// </summary>
+    public static class ProtobufEqualityComparers
+    {
+        /// <summary>
+        /// Returns an equality comparer for <typeparamref name="T"/> suitable for Protobuf equality comparisons.
+        /// This is usually just the default equality comparer for the type, but floating point numbers are compared
+        /// bitwise.
+        /// </summary>
+        /// <typeparam name="T">The type of equality comparer to return.</typeparam>
+        /// <returns>The equality comparer.</returns>
+        public static EqualityComparer<T> GetEqualityComparer<T>()
+        {
+            return typeof(T) == typeof(double) ? (EqualityComparer<T>) (object) BitwiseDoubleEqualityComparer
+                : typeof(T) == typeof(float) ? (EqualityComparer<T>) (object) BitwiseSingleEqualityComparer
+                : typeof(T) == typeof(double?) ? (EqualityComparer<T>) (object) BitwiseNullableDoubleEqualityComparer
+                : typeof(T) == typeof(float?) ? (EqualityComparer<T>) (object) BitwiseNullableSingleEqualityComparer
+                : EqualityComparer<T>.Default;
+        }
+
+        /// <summary>
+        /// Returns an equality comparer suitable for comparing 64-bit floating point values, by bitwise comparison.
+        /// (NaN values are considered equal, but only when they have the same representation.)
+        /// </summary>
+        public static EqualityComparer<double> BitwiseDoubleEqualityComparer { get; } = new BitwiseDoubleEqualityComparerImpl();
+
+        /// <summary>
+        /// Returns an equality comparer suitable for comparing 32-bit floating point values, by bitwise comparison.
+        /// (NaN values are considered equal, but only when they have the same representation.)
+        /// </summary>
+        public static EqualityComparer<float> BitwiseSingleEqualityComparer { get; } = new BitwiseSingleEqualityComparerImpl();
+
+        /// <summary>
+        /// Returns an equality comparer suitable for comparing nullable 64-bit floating point values, by bitwise comparison.
+        /// (NaN values are considered equal, but only when they have the same representation.)
+        /// </summary>
+        public static EqualityComparer<double?> BitwiseNullableDoubleEqualityComparer { get; } = new BitwiseNullableDoubleEqualityComparerImpl();
+
+        /// <summary>
+        /// Returns an equality comparer suitable for comparing nullable 32-bit floating point values, by bitwise comparison.
+        /// (NaN values are considered equal, but only when they have the same representation.)
+        /// </summary>
+        public static EqualityComparer<float?> BitwiseNullableSingleEqualityComparer { get; } = new BitwiseNullableSingleEqualityComparerImpl();
+
+        private class BitwiseDoubleEqualityComparerImpl : EqualityComparer<double>
+        {
+            public override bool Equals(double x, double y) =>
+                BitConverter.DoubleToInt64Bits(x) == BitConverter.DoubleToInt64Bits(y);
+
+            public override int GetHashCode(double obj) =>
+                BitConverter.DoubleToInt64Bits(obj).GetHashCode();
+        }
+
+        private class BitwiseSingleEqualityComparerImpl : EqualityComparer<float>
+        {
+            // Just promote values to double and use BitConverter.DoubleToInt64Bits,
+            // as there's no BitConverter.SingleToInt32Bits, unfortunately.
+
+            public override bool Equals(float x, float y) =>
+                BitConverter.DoubleToInt64Bits(x) == BitConverter.DoubleToInt64Bits(y);
+
+            public override int GetHashCode(float obj) =>
+                BitConverter.DoubleToInt64Bits(obj).GetHashCode();
+        }
+
+        private class BitwiseNullableDoubleEqualityComparerImpl : EqualityComparer<double?>
+        {
+            public override bool Equals(double? x, double? y) =>
+                x == null && y == null ? true
+                : x == null || y == null ? false
+                : BitwiseDoubleEqualityComparer.Equals(x.Value, y.Value);
+
+            // The hash code for null is just a constant which is at least *unlikely* to be used
+            // elsewhere. (Compared with 0, say.)
+            public override int GetHashCode(double? obj) =>
+                obj == null ? 293864 : BitwiseDoubleEqualityComparer.GetHashCode(obj.Value);
+        }
+
+        private class BitwiseNullableSingleEqualityComparerImpl : EqualityComparer<float?>
+        {
+            public override bool Equals(float? x, float? y) =>
+                x == null && y == null ? true
+                : x == null || y == null ? false
+                : BitwiseSingleEqualityComparer.Equals(x.Value, y.Value);
+
+            // The hash code for null is just a constant which is at least *unlikely* to be used
+            // elsewhere. (Compared with 0, say.)
+            public override int GetHashCode(float? obj) =>
+                obj == null ? 293864 : BitwiseSingleEqualityComparer.GetHashCode(obj.Value);
+        }
+    }
+}
diff --git a/csharp/src/Google.Protobuf/Collections/RepeatedField.cs b/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
index 6063ff61..c18b63e2 100755
--- a/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
+++ b/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
@@ -51,6 +51,7 @@ namespace Google.Protobuf.Collections
         , IReadOnlyList<T>
 #endif
     {
+        private static readonly EqualityComparer<T> EqualityComparer = ProtobufEqualityComparers.GetEqualityComparer<T>();
         private static readonly T[] EmptyArray = new T[0];
         private const int MinArraySize = 8;
 
@@ -434,7 +435,7 @@ namespace Google.Protobuf.Collections
             {
                 return false;
             }
-            EqualityComparer<T> comparer = EqualityComparer<T>.Default;
+            EqualityComparer<T> comparer = EqualityComparer;
             for (int i = 0; i < count; i++)
             {
                 if (!comparer.Equals(array[i], other.array[i]))
@@ -454,7 +455,7 @@ namespace Google.Protobuf.Collections
         public int IndexOf(T item)
         {
             ProtoPreconditions.CheckNotNullUnconstrained(item, nameof(item));
-            EqualityComparer<T> comparer = EqualityComparer<T>.Default;
+            EqualityComparer<T> comparer = EqualityComparer;
             for (int i = 0; i < count; i++)
             {
                 if (comparer.Equals(array[i], item))
diff --git a/csharp/src/Google.Protobuf/Compatibility/MethodInfoExtensions.cs b/csharp/src/Google.Protobuf/Compatibility/MethodInfoExtensions.cs
new file mode 100644
index 00000000..7b946cb6
--- /dev/null
+++ b/csharp/src/Google.Protobuf/Compatibility/MethodInfoExtensions.cs
@@ -0,0 +1,47 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+#if NET35
+using System;
+using System.Reflection;
+
+namespace Google.Protobuf.Compatibility
+{
+    // .NET Core (at least netstandard1.0) doesn't have Delegate.CreateDelegate, and .NET 3.5 doesn't have
+    // MethodInfo.CreateDelegate. Proxy from one to the other on .NET 3.5...
+    internal static class MethodInfoExtensions
+    {
+        internal static Delegate CreateDelegate(this MethodInfo method, Type type) =>
+            Delegate.CreateDelegate(type, method);
+    }
+}
+#endif
diff --git a/csharp/src/Google.Protobuf/FieldCodec.cs b/csharp/src/Google.Protobuf/FieldCodec.cs
index c28b47e1..a11f2420 100644
--- a/csharp/src/Google.Protobuf/FieldCodec.cs
+++ b/csharp/src/Google.Protobuf/FieldCodec.cs
@@ -30,6 +30,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
+using Google.Protobuf.Collections;
 using Google.Protobuf.Compatibility;
 using Google.Protobuf.WellKnownTypes;
 using System;
@@ -346,6 +347,7 @@ namespace Google.Protobuf
     /// </remarks>
     public sealed class FieldCodec<T>
     {
+        private static readonly EqualityComparer<T> EqualityComparer = ProtobufEqualityComparers.GetEqualityComparer<T>();
         private static readonly T DefaultDefault;
         // Only non-nullable value types support packing. This is the simplest way of detecting that.
         private static readonly bool TypeSupportsPacking = default(T) != null;
@@ -469,6 +471,6 @@ namespace Google.Protobuf
         /// </summary>
         public int CalculateSizeWithTag(T value) => IsDefault(value) ? 0 : ValueSizeCalculator(value) + tagSize;
 
-        private bool IsDefault(T value) => EqualityComparer<T>.Default.Equals(value, DefaultValue);
+        private bool IsDefault(T value) => EqualityComparer.Equals(value, DefaultValue);
     }
 }
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
new file mode 100644
index 00000000..93dcd854
--- /dev/null
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <Description>C# runtime library for Protocol Buffers - Google's data interchange format.</Description>
+    <Copyright>Copyright 2015, Google Inc.</Copyright>
+    <AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
+    <VersionPrefix>3.5.2</VersionPrefix>
+    <Authors>Google Inc.</Authors>
+    <TargetFrameworks>netstandard1.0;net45</TargetFrameworks>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <AssemblyOriginatorKeyFile>../../keys/Google.Protobuf.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
+    <PackageTags>Protocol;Buffers;Binary;Serialization;Format;Google;proto;proto3</PackageTags>
+    <PackageReleaseNotes>C# proto3 support</PackageReleaseNotes>
+    <PackageProjectUrl>https://github.com/google/protobuf</PackageProjectUrl>
+    <PackageLicenseUrl>https://github.com/google/protobuf/blob/master/LICENSE</PackageLicenseUrl>
+    <RepositoryType>git</RepositoryType>
+    <RepositoryUrl>https://github.com/google/protobuf.git</RepositoryUrl>
+  </PropertyGroup>
+
+  <!-- 
+    - Override target frameworks on non-Windows to just .NET Core
+    - Doing this conditionally in the initial PropertyGroup confuses
+    - Visual Studio.
+    -->
+  <PropertyGroup Condition="'$(OS)' != 'Windows_NT'">
+    <TargetFrameworks>netstandard1.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SourceLink.Create.CommandLine" Version="2.7.6" PrivateAssets="All" /> 
+  </ItemGroup>
+
+</Project>
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.xproj b/csharp/src/Google.Protobuf/Google.Protobuf.xproj
deleted file mode 100644
index c68e0db3..00000000
--- a/csharp/src/Google.Protobuf/Google.Protobuf.xproj
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
-    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
-  <PropertyGroup Label="Globals">
-    <ProjectGuid>9b576380-726d-4142-8238-60a43ab0e35a</ProjectGuid>
-    <RootNamespace>Google.Protobuf</RootNamespace>
-    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
-    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-  </PropertyGroup>
-
-  <PropertyGroup>
-    <SchemaVersion>2.0</SchemaVersion>
-  </PropertyGroup>
-  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf/JsonFormatter.cs b/csharp/src/Google.Protobuf/JsonFormatter.cs
index 90c2e937..4ae10d8b 100755
--- a/csharp/src/Google.Protobuf/JsonFormatter.cs
+++ b/csharp/src/Google.Protobuf/JsonFormatter.cs
@@ -375,14 +375,21 @@ namespace Google.Protobuf
             }
             else if (value is System.Enum)
             {
-                string name = OriginalEnumValueHelper.GetOriginalName(value);
-                if (name != null)
+                if (settings.FormatEnumsAsIntegers)
                 {
-                    WriteString(writer, name);
+                    WriteValue(writer, (int)value);
                 }
                 else
                 {
-                    WriteValue(writer, (int)value);
+                    string name = OriginalEnumValueHelper.GetOriginalName(value);
+                    if (name != null)
+                    {
+                        WriteString(writer, name);
+                    }
+                    else
+                    {
+                        WriteValue(writer, (int)value);
+                    }
                 }
             }
             else if (value is float || value is double)
@@ -778,7 +785,11 @@ namespace Google.Protobuf
             /// </summary>
             public TypeRegistry TypeRegistry { get; }
 
-            // TODO: Work out how we're going to scale this to multiple settings. "WithXyz" methods?
+            /// <summary>
+            /// Whether to format enums as ints. Defaults to false.
+            /// </summary>
+            public bool FormatEnumsAsIntegers { get; }
+
 
             /// <summary>
             /// Creates a new <see cref="Settings"/> object with the specified formatting of default values
@@ -795,11 +806,42 @@ namespace Google.Protobuf
             /// </summary>
             /// <param name="formatDefaultValues"><c>true</c> if default values (0, empty strings etc) should be formatted; <c>false</c> otherwise.</param>
             /// <param name="typeRegistry">The <see cref="TypeRegistry"/> to use when formatting <see cref="Any"/> messages.</param>
-            public Settings(bool formatDefaultValues, TypeRegistry typeRegistry)
+            public Settings(bool formatDefaultValues, TypeRegistry typeRegistry) : this(formatDefaultValues, typeRegistry, false)
+            {
+            }
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object with the specified parameters.
+            /// </summary>
+            /// <param name="formatDefaultValues"><c>true</c> if default values (0, empty strings etc) should be formatted; <c>false</c> otherwise.</param>
+            /// <param name="typeRegistry">The <see cref="TypeRegistry"/> to use when formatting <see cref="Any"/> messages. TypeRegistry.Empty will be used if it is null.</param>
+            /// <param name="formatEnumsAsIntegers"><c>true</c> to format the enums as integers; <c>false</c> to format enums as enum names.</param>
+            private Settings(bool formatDefaultValues,
+                            TypeRegistry typeRegistry,
+                            bool formatEnumsAsIntegers)
             {
                 FormatDefaultValues = formatDefaultValues;
-                TypeRegistry = ProtoPreconditions.CheckNotNull(typeRegistry, nameof(typeRegistry));
+                TypeRegistry = typeRegistry ?? TypeRegistry.Empty;
+                FormatEnumsAsIntegers = formatEnumsAsIntegers;
             }
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object with the specified formatting of default values and the current settings.
+            /// </summary>
+            /// <param name="formatDefaultValues"><c>true</c> if default values (0, empty strings etc) should be formatted; <c>false</c> otherwise.</param>
+            public Settings WithFormatDefaultValues(bool formatDefaultValues) => new Settings(formatDefaultValues, TypeRegistry, FormatEnumsAsIntegers);
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object with the specified type registry and the current settings.
+            /// </summary>
+            /// <param name="typeRegistry">The <see cref="TypeRegistry"/> to use when formatting <see cref="Any"/> messages.</param>
+            public Settings WithTypeRegistry(TypeRegistry typeRegistry) => new Settings(FormatDefaultValues, typeRegistry, FormatEnumsAsIntegers);
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object with the specified enums formatting option and the current settings.
+            /// </summary>
+            /// <param name="formatEnumsAsIntegers"><c>true</c> to format the enums as integers; <c>false</c> to format enums as enum names.</param>
+            public Settings WithFormatEnumsAsIntegers(bool formatEnumsAsIntegers) => new Settings(FormatDefaultValues, TypeRegistry, formatEnumsAsIntegers);
         }
 
         // Effectively a cache of mapping from enum values to the original name as specified in the proto file,
diff --git a/csharp/src/Google.Protobuf/JsonParser.cs b/csharp/src/Google.Protobuf/JsonParser.cs
index 6b6f2d9a..284bce93 100644
--- a/csharp/src/Google.Protobuf/JsonParser.cs
+++ b/csharp/src/Google.Protobuf/JsonParser.cs
@@ -203,10 +203,14 @@ namespace Google.Protobuf
                 }
                 else
                 {
-                    // TODO: Is this what we want to do? If not, we'll need to skip the value,
-                    // which may be an object or array. (We might want to put code in the tokenizer
-                    // to do that.)
-                    throw new InvalidProtocolBufferException("Unknown field: " + name);
+                    if (settings.IgnoreUnknownFields)
+                    {
+                        tokenizer.SkipValue();
+                    }
+                    else
+                    {
+                        throw new InvalidProtocolBufferException("Unknown field: " + name);
+                    }
                 }
             }
         }
@@ -260,11 +264,12 @@ namespace Google.Protobuf
                     return;
                 }
                 tokenizer.PushBack(token);
-                if (token.Type == JsonToken.TokenType.Null)
+                object value = ParseSingleValue(field, tokenizer);
+                if (value == null)
                 {
                     throw new InvalidProtocolBufferException("Repeated field elements cannot be null");
                 }
-                list.Add(ParseSingleValue(field, tokenizer));
+                list.Add(value);
             }
         }
 
@@ -997,6 +1002,19 @@ namespace Google.Protobuf
             public TypeRegistry TypeRegistry { get; }
 
             /// <summary>
+            /// Whether the parser should ignore unknown fields (<c>true</c>) or throw an exception when
+            /// they are encountered (<c>false</c>).
+            /// </summary>
+            public bool IgnoreUnknownFields { get; }
+
+            private Settings(int recursionLimit, TypeRegistry typeRegistry, bool ignoreUnknownFields)
+            {
+                RecursionLimit = recursionLimit;
+                TypeRegistry = ProtoPreconditions.CheckNotNull(typeRegistry, nameof(typeRegistry));
+                IgnoreUnknownFields = ignoreUnknownFields;
+            }
+
+            /// <summary>
             /// Creates a new <see cref="Settings"/> object with the specified recursion limit.
             /// </summary>
             /// <param name="recursionLimit">The maximum depth of messages to parse</param>
@@ -1009,11 +1027,34 @@ namespace Google.Protobuf
             /// </summary>
             /// <param name="recursionLimit">The maximum depth of messages to parse</param>
             /// <param name="typeRegistry">The type registry used to parse <see cref="Any"/> messages</param>
-            public Settings(int recursionLimit, TypeRegistry typeRegistry)
+            public Settings(int recursionLimit, TypeRegistry typeRegistry) : this(recursionLimit, typeRegistry, false)
             {
-                RecursionLimit = recursionLimit;
-                TypeRegistry = ProtoPreconditions.CheckNotNull(typeRegistry, nameof(typeRegistry));
             }
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object set to either ignore unknown fields, or throw an exception
+            /// when unknown fields are encountered.
+            /// </summary>
+            /// <param name="ignoreUnknownFields"><c>true</c> if unknown fields should be ignored when parsing; <c>false</c> to throw an exception.</param>
+            public Settings WithIgnoreUnknownFields(bool ignoreUnknownFields) =>
+                new Settings(RecursionLimit, TypeRegistry, ignoreUnknownFields);
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object based on this one, but with the specified recursion limit.
+            /// </summary>
+            /// <param name="recursionLimit">The new recursion limit.</param>
+            public Settings WithRecursionLimit(int recursionLimit) =>
+                new Settings(recursionLimit, TypeRegistry, IgnoreUnknownFields);
+
+            /// <summary>
+            /// Creates a new <see cref="Settings"/> object based on this one, but with the specified type registry.
+            /// </summary>
+            /// <param name="typeRegistry">The new type registry. Must not be null.</param>
+            public Settings WithTypeRegistry(TypeRegistry typeRegistry) =>
+                new Settings(
+                    RecursionLimit,
+                    ProtoPreconditions.CheckNotNull(typeRegistry, nameof(typeRegistry)),
+                    IgnoreUnknownFields);
         }
     }
 }
diff --git a/csharp/src/Google.Protobuf/JsonTokenizer.cs b/csharp/src/Google.Protobuf/JsonTokenizer.cs
index 09a6d43b..0e403f78 100644
--- a/csharp/src/Google.Protobuf/JsonTokenizer.cs
+++ b/csharp/src/Google.Protobuf/JsonTokenizer.cs
@@ -138,6 +138,34 @@ namespace Google.Protobuf
         protected abstract JsonToken NextImpl();
 
         /// <summary>
+        /// Skips the value we're about to read. This must only be called immediately after reading a property name.
+        /// If the value is an object or an array, the complete object/array is skipped.
+        /// </summary>
+        internal void SkipValue()
+        {
+            // We'll assume that Next() makes sure that the end objects and end arrays are all valid.
+            // All we care about is the total nesting depth we need to close.
+            int depth = 0;
+
+            // do/while rather than while loop so that we read at least one token.
+            do
+            {
+                var token = Next();
+                switch (token.Type)
+                {
+                    case JsonToken.TokenType.EndArray:
+                    case JsonToken.TokenType.EndObject:
+                        depth--;
+                        break;
+                    case JsonToken.TokenType.StartArray:
+                    case JsonToken.TokenType.StartObject:
+                        depth++;
+                        break;
+                }
+            } while (depth != 0);
+        }
+
+        /// <summary>
         /// Tokenizer which first exhausts a list of tokens, then consults another tokenizer.
         /// </summary>
         private class JsonReplayTokenizer : JsonTokenizer
@@ -217,7 +245,7 @@ namespace Google.Protobuf
                             state = State.ObjectAfterColon;
                             break;
                         case ',':
-                            ValidateState(State.ObjectAfterProperty | State.ArrayAfterValue, "Invalid state to read a colon: ");
+                            ValidateState(State.ObjectAfterProperty | State.ArrayAfterValue, "Invalid state to read a comma: ");
                             state = state == State.ObjectAfterProperty ? State.ObjectAfterComma : State.ArrayAfterComma;
                             break;
                         case '"':
diff --git a/csharp/src/Google.Protobuf/MessageExtensions.cs b/csharp/src/Google.Protobuf/MessageExtensions.cs
index 047156c3..62181eb9 100644
--- a/csharp/src/Google.Protobuf/MessageExtensions.cs
+++ b/csharp/src/Google.Protobuf/MessageExtensions.cs
@@ -44,42 +44,34 @@ namespace Google.Protobuf
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="data">The data to merge, which must be protobuf-encoded binary data.</param>
-        public static void MergeFrom(this IMessage message, byte[] data)
-        {
-            ProtoPreconditions.CheckNotNull(message, "message");
-            ProtoPreconditions.CheckNotNull(data, "data");
-            CodedInputStream input = new CodedInputStream(data);
-            message.MergeFrom(input);
-            input.CheckReadEndOfStreamTag();
-        }
+        public static void MergeFrom(this IMessage message, byte[] data) =>
+            MergeFrom(message, data, false);
+
+        /// <summary>
+        /// Merges data from the given byte array slice into an existing message.
+        /// </summary>
+        /// <param name="message">The message to merge the data into.</param>
+        /// <param name="data">The data containing the slice to merge, which must be protobuf-encoded binary data.</param>
+        /// <param name="offset">The offset of the slice to merge.</param>
+        /// <param name="length">The length of the slice to merge.</param>
+        public static void MergeFrom(this IMessage message, byte[] data, int offset, int length) =>
+            MergeFrom(message, data, offset, length, false);
 
         /// <summary>
         /// Merges data from the given byte string into an existing message.
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="data">The data to merge, which must be protobuf-encoded binary data.</param>
-        public static void MergeFrom(this IMessage message, ByteString data)
-        {
-            ProtoPreconditions.CheckNotNull(message, "message");
-            ProtoPreconditions.CheckNotNull(data, "data");
-            CodedInputStream input = data.CreateCodedInput();
-            message.MergeFrom(input);
-            input.CheckReadEndOfStreamTag();
-        }
+        public static void MergeFrom(this IMessage message, ByteString data) =>
+            MergeFrom(message, data, false);
 
         /// <summary>
         /// Merges data from the given stream into an existing message.
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="input">Stream containing the data to merge, which must be protobuf-encoded binary data.</param>
-        public static void MergeFrom(this IMessage message, Stream input)
-        {
-            ProtoPreconditions.CheckNotNull(message, "message");
-            ProtoPreconditions.CheckNotNull(input, "input");
-            CodedInputStream codedInput = new CodedInputStream(input);
-            message.MergeFrom(codedInput);
-            codedInput.CheckReadEndOfStreamTag();
-        }
+        public static void MergeFrom(this IMessage message, Stream input) =>
+            MergeFrom(message, input, false);
 
         /// <summary>
         /// Merges length-delimited data from the given stream into an existing message.
@@ -90,14 +82,8 @@ namespace Google.Protobuf
         /// </remarks>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="input">Stream containing the data to merge, which must be protobuf-encoded binary data.</param>
-        public static void MergeDelimitedFrom(this IMessage message, Stream input)
-        {
-            ProtoPreconditions.CheckNotNull(message, "message");
-            ProtoPreconditions.CheckNotNull(input, "input");
-            int size = (int) CodedInputStream.ReadRawVarint32(input);
-            Stream limitedStream = new LimitedInputStream(input, size);
-            message.MergeFrom(limitedStream);
-        }
+        public static void MergeDelimitedFrom(this IMessage message, Stream input) =>
+            MergeDelimitedFrom(message, input, false);
 
         /// <summary>
         /// Converts the given message into a byte array in protobuf encoding.
@@ -152,6 +138,56 @@ namespace Google.Protobuf
         {
             ProtoPreconditions.CheckNotNull(message, "message");
             return ByteString.AttachBytes(message.ToByteArray());
-        }        
+        }
+
+        // Implementations allowing unknown fields to be discarded.
+        internal static void MergeFrom(this IMessage message, byte[] data, bool discardUnknownFields)
+        {
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(data, "data");
+            CodedInputStream input = new CodedInputStream(data);
+            input.DiscardUnknownFields = discardUnknownFields;
+            message.MergeFrom(input);
+            input.CheckReadEndOfStreamTag();
+        }
+
+        internal static void MergeFrom(this IMessage message, byte[] data, int offset, int length, bool discardUnknownFields)
+        {
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(data, "data");
+            CodedInputStream input = new CodedInputStream(data, offset, length);
+            input.DiscardUnknownFields = discardUnknownFields;
+            message.MergeFrom(input);
+            input.CheckReadEndOfStreamTag();
+        }
+
+        internal static void MergeFrom(this IMessage message, ByteString data, bool discardUnknownFields)
+        {
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(data, "data");
+            CodedInputStream input = data.CreateCodedInput();
+            input.DiscardUnknownFields = discardUnknownFields;
+            message.MergeFrom(input);
+            input.CheckReadEndOfStreamTag();
+        }
+
+        internal static void MergeFrom(this IMessage message, Stream input, bool discardUnknownFields)
+        {
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(input, "input");
+            CodedInputStream codedInput = new CodedInputStream(input);
+            codedInput.DiscardUnknownFields = discardUnknownFields;
+            message.MergeFrom(codedInput);
+            codedInput.CheckReadEndOfStreamTag();
+        }
+
+        internal static void MergeDelimitedFrom(this IMessage message, Stream input, bool discardUnknownFields)
+        {
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(input, "input");
+            int size = (int) CodedInputStream.ReadRawVarint32(input);
+            Stream limitedStream = new LimitedInputStream(input, size);
+            MergeFrom(message, limitedStream, discardUnknownFields);
+        }
     }
 }
diff --git a/csharp/src/Google.Protobuf/MessageParser.cs b/csharp/src/Google.Protobuf/MessageParser.cs
index 8889638b..4d35554a 100644
--- a/csharp/src/Google.Protobuf/MessageParser.cs
+++ b/csharp/src/Google.Protobuf/MessageParser.cs
@@ -42,10 +42,13 @@ namespace Google.Protobuf
     public class MessageParser
     {
         private Func<IMessage> factory;
+        // TODO: When we use a C# 7.1 compiler, make this private protected.
+        internal bool DiscardUnknownFields { get; }
 
-        internal MessageParser(Func<IMessage> factory)
+        internal MessageParser(Func<IMessage> factory, bool discardUnknownFields)
         {
             this.factory = factory;
+            DiscardUnknownFields = discardUnknownFields;
         }
 
         /// <summary>
@@ -64,9 +67,22 @@ namespace Google.Protobuf
         /// <returns>The newly parsed message.</returns>
         public IMessage ParseFrom(byte[] data)
         {
-            ProtoPreconditions.CheckNotNull(data, "data");
             IMessage message = factory();
-            message.MergeFrom(data);
+            message.MergeFrom(data, DiscardUnknownFields);
+            return message;
+        }
+
+        /// <summary>
+        /// Parses a message from a byte array slice.
+        /// </summary>
+        /// <param name="data">The byte array containing the message. Must not be null.</param>
+        /// <param name="offset">The offset of the slice to parse.</param>
+        /// <param name="length">The length of the slice to parse.</param>
+        /// <returns>The newly parsed message.</returns>
+        public IMessage ParseFrom(byte[] data, int offset, int length)
+        {
+            IMessage message = factory();
+            message.MergeFrom(data, offset, length, DiscardUnknownFields);
             return message;
         }
 
@@ -77,9 +93,8 @@ namespace Google.Protobuf
         /// <returns>The parsed message.</returns>
         public IMessage ParseFrom(ByteString data)
         {
-            ProtoPreconditions.CheckNotNull(data, "data");
             IMessage message = factory();
-            message.MergeFrom(data);
+            message.MergeFrom(data, DiscardUnknownFields);
             return message;
         }
 
@@ -91,7 +106,7 @@ namespace Google.Protobuf
         public IMessage ParseFrom(Stream input)
         {
             IMessage message = factory();
-            message.MergeFrom(input);
+            message.MergeFrom(input, DiscardUnknownFields);
             return message;
         }
 
@@ -107,7 +122,7 @@ namespace Google.Protobuf
         public IMessage ParseDelimitedFrom(Stream input)
         {
             IMessage message = factory();
-            message.MergeDelimitedFrom(input);
+            message.MergeDelimitedFrom(input, DiscardUnknownFields);
             return message;
         }
 
@@ -119,7 +134,7 @@ namespace Google.Protobuf
         public IMessage ParseFrom(CodedInputStream input)
         {
             IMessage message = factory();
-            message.MergeFrom(input);
+            MergeFrom(message, input);
             return message;
         }
 
@@ -136,6 +151,29 @@ namespace Google.Protobuf
             JsonParser.Default.Merge(message, json);
             return message;
         }
+
+        // TODO: When we're using a C# 7.1 compiler, make this private protected.
+        internal void MergeFrom(IMessage message, CodedInputStream codedInput)
+        {
+            bool originalDiscard = codedInput.DiscardUnknownFields;
+            try
+            {
+                codedInput.DiscardUnknownFields = DiscardUnknownFields;
+                message.MergeFrom(codedInput);
+            }
+            finally
+            {
+                codedInput.DiscardUnknownFields = originalDiscard;
+            }
+        }
+
+        /// <summary>
+        /// Creates a new message parser which optionally discards unknown fields when parsing.
+        /// </summary>
+        /// <param name="discardUnknownFields">Whether or not to discard unknown fields when parsing.</param>
+        /// <returns>A newly configured message parser.</returns>
+        public MessageParser WithDiscardUnknownFields(bool discardUnknownFields) =>
+            new MessageParser(factory, discardUnknownFields);
     }
 
     /// <summary>
@@ -170,7 +208,11 @@ namespace Google.Protobuf
         /// to require a parameterless constructor: delegates are significantly faster to execute.
         /// </remarks>
         /// <param name="factory">Function to invoke when a new, empty message is required.</param>
-        public MessageParser(Func<T> factory) : base(() => factory())
+        public MessageParser(Func<T> factory) : this(factory, false)
+        {
+        }
+
+        internal MessageParser(Func<T> factory, bool discardUnknownFields) : base(() => factory(), discardUnknownFields)
         {
             this.factory = factory;
         }
@@ -191,9 +233,22 @@ namespace Google.Protobuf
         /// <returns>The newly parsed message.</returns>
         public new T ParseFrom(byte[] data)
         {
-            ProtoPreconditions.CheckNotNull(data, "data");
             T message = factory();
-            message.MergeFrom(data);
+            message.MergeFrom(data, DiscardUnknownFields);
+            return message;
+        }
+
+        /// <summary>
+        /// Parses a message from a byte array slice.
+        /// </summary>
+        /// <param name="data">The byte array containing the message. Must not be null.</param>
+        /// <param name="offset">The offset of the slice to parse.</param>
+        /// <param name="length">The length of the slice to parse.</param>
+        /// <returns>The newly parsed message.</returns>
+        public new T ParseFrom(byte[] data, int offset, int length)
+        {
+            T message = factory();
+            message.MergeFrom(data, offset, length, DiscardUnknownFields);
             return message;
         }
 
@@ -204,9 +259,8 @@ namespace Google.Protobuf
         /// <returns>The parsed message.</returns>
         public new T ParseFrom(ByteString data)
         {
-            ProtoPreconditions.CheckNotNull(data, "data");
             T message = factory();
-            message.MergeFrom(data);
+            message.MergeFrom(data, DiscardUnknownFields);
             return message;
         }
 
@@ -218,7 +272,7 @@ namespace Google.Protobuf
         public new T ParseFrom(Stream input)
         {
             T message = factory();
-            message.MergeFrom(input);
+            message.MergeFrom(input, DiscardUnknownFields);
             return message;
         }
 
@@ -234,7 +288,7 @@ namespace Google.Protobuf
         public new T ParseDelimitedFrom(Stream input)
         {
             T message = factory();
-            message.MergeDelimitedFrom(input);
+            message.MergeDelimitedFrom(input, DiscardUnknownFields);
             return message;
         }
 
@@ -246,7 +300,7 @@ namespace Google.Protobuf
         public new T ParseFrom(CodedInputStream input)
         {
             T message = factory();
-            message.MergeFrom(input);
+            MergeFrom(message, input);
             return message;
         }
 
@@ -263,5 +317,13 @@ namespace Google.Protobuf
             JsonParser.Default.Merge(message, json);
             return message;
         }
+
+        /// <summary>
+        /// Creates a new message parser which optionally discards unknown fields when parsing.
+        /// </summary>
+        /// <param name="discardUnknownFields">Whether or not to discard unknown fields when parsing.</param>
+        /// <returns>A newly configured message parser.</returns>
+        public new MessageParser<T> WithDiscardUnknownFields(bool discardUnknownFields) =>
+            new MessageParser<T>(factory, discardUnknownFields);
     }
 }
diff --git a/csharp/src/Google.Protobuf/Reflection/Descriptor.cs b/csharp/src/Google.Protobuf/Reflection/Descriptor.cs
index c6819899..4cbed33b 100644
--- a/csharp/src/Google.Protobuf/Reflection/Descriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/Descriptor.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/descriptor.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/descriptor.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -35,7 +37,7 @@ namespace Google.Protobuf.Reflection {
             "LnByb3RvYnVmLkZpZWxkRGVzY3JpcHRvclByb3RvEi0KB29wdGlvbnMYCCAB",
             "KAsyHC5nb29nbGUucHJvdG9idWYuRmlsZU9wdGlvbnMSOQoQc291cmNlX2Nv",
             "ZGVfaW5mbxgJIAEoCzIfLmdvb2dsZS5wcm90b2J1Zi5Tb3VyY2VDb2RlSW5m",
-            "bxIOCgZzeW50YXgYDCABKAki8AQKD0Rlc2NyaXB0b3JQcm90bxIMCgRuYW1l",
+            "bxIOCgZzeW50YXgYDCABKAkiqQUKD0Rlc2NyaXB0b3JQcm90bxIMCgRuYW1l",
             "GAEgASgJEjQKBWZpZWxkGAIgAygLMiUuZ29vZ2xlLnByb3RvYnVmLkZpZWxk",
             "RGVzY3JpcHRvclByb3RvEjgKCWV4dGVuc2lvbhgGIAMoCzIlLmdvb2dsZS5w",
             "cm90b2J1Zi5GaWVsZERlc2NyaXB0b3JQcm90bxI1CgtuZXN0ZWRfdHlwZRgD",
@@ -47,119 +49,130 @@ namespace Google.Protobuf.Reflection {
             "b3RvEjAKB29wdGlvbnMYByABKAsyHy5nb29nbGUucHJvdG9idWYuTWVzc2Fn",
             "ZU9wdGlvbnMSRgoOcmVzZXJ2ZWRfcmFuZ2UYCSADKAsyLi5nb29nbGUucHJv",
             "dG9idWYuRGVzY3JpcHRvclByb3RvLlJlc2VydmVkUmFuZ2USFQoNcmVzZXJ2",
-            "ZWRfbmFtZRgKIAMoCRosCg5FeHRlbnNpb25SYW5nZRINCgVzdGFydBgBIAEo",
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+            "aW9uGOcHIAMoCzIkLmdvb2dsZS5wcm90b2J1Zi5VbmludGVycHJldGVkT3B0",
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+            "UElFQ0UQAiI1CgZKU1R5cGUSDQoJSlNfTk9STUFMEAASDQoJSlNfU1RSSU5H",
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+            "dGlvbnMSQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xl",
+            "LnByb3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjoBxCAgICAAiKTAQoL",
+            "RW51bU9wdGlvbnMSEwoLYWxsb3dfYWxpYXMYAiABKAgSGQoKZGVwcmVjYXRl",
+            "ZBgDIAEoCDoFZmFsc2USQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygL",
+            "MiQuZ29vZ2xlLnByb3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjoBxCA",
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+            "ChNJREVNUE9URU5DWV9VTktOT1dOEAASEwoPTk9fU0lERV9FRkZFQ1RTEAES",
+            "DgoKSURFTVBPVEVOVBACKgkI6AcQgICAgAIingIKE1VuaW50ZXJwcmV0ZWRP",
+            "cHRpb24SOwoEbmFtZRgCIAMoCzItLmdvb2dsZS5wcm90b2J1Zi5VbmludGVy",
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+            "b24SEAoEcGF0aBgBIAMoBUICEAESEAoEc3BhbhgCIAMoBUICEAESGAoQbGVh",
+            "ZGluZ19jb21tZW50cxgDIAEoCRIZChF0cmFpbGluZ19jb21tZW50cxgEIAEo",
+            "CRIhChlsZWFkaW5nX2RldGFjaGVkX2NvbW1lbnRzGAYgAygJIqcBChFHZW5l",
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+            "b3RvYnVmLkdlbmVyYXRlZENvZGVJbmZvLkFubm90YXRpb24aTwoKQW5ub3Rh",
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+            "dG9idWZCEERlc2NyaXB0b3JQcm90b3NIAVo+Z2l0aHViLmNvbS9nb2xhbmcv",
+            "cHJvdG9idWYvcHJvdG9jLWdlbi1nby9kZXNjcmlwdG9yO2Rlc2NyaXB0b3L4",
+            "AQGiAgNHUEKqAhpHb29nbGUuUHJvdG9idWYuUmVmbGVjdGlvbg=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FileDescriptorSet), global::Google.Protobuf.Reflection.FileDescriptorSet.Parser, new[]{ "File" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FileDescriptorProto), global::Google.Protobuf.Reflection.FileDescriptorProto.Parser, new[]{ "Name", "Package", "Dependency", "PublicDependency", "WeakDependency", "MessageType", "EnumType", "Service", "Extension", "Options", "SourceCodeInfo", "Syntax" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.DescriptorProto), global::Google.Protobuf.Reflection.DescriptorProto.Parser, new[]{ "Name", "Field", "Extension", "NestedType", "EnumType", "ExtensionRange", "OneofDecl", "Options", "ReservedRange", "ReservedName" }, null, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.DescriptorProto.Types.ExtensionRange), global::Google.Protobuf.Reflection.DescriptorProto.Types.ExtensionRange.Parser, new[]{ "Start", "End" }, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.DescriptorProto), global::Google.Protobuf.Reflection.DescriptorProto.Parser, new[]{ "Name", "Field", "Extension", "NestedType", "EnumType", "ExtensionRange", "OneofDecl", "Options", "ReservedRange", "ReservedName" }, null, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.DescriptorProto.Types.ExtensionRange), global::Google.Protobuf.Reflection.DescriptorProto.Types.ExtensionRange.Parser, new[]{ "Start", "End", "Options" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.DescriptorProto.Types.ReservedRange), global::Google.Protobuf.Reflection.DescriptorProto.Types.ReservedRange.Parser, new[]{ "Start", "End" }, null, null, null)}),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.ExtensionRangeOptions), global::Google.Protobuf.Reflection.ExtensionRangeOptions.Parser, new[]{ "UninterpretedOption" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FieldDescriptorProto), global::Google.Protobuf.Reflection.FieldDescriptorProto.Parser, new[]{ "Name", "Number", "Label", "Type", "TypeName", "Extendee", "DefaultValue", "OneofIndex", "JsonName", "Options" }, null, new[]{ typeof(global::Google.Protobuf.Reflection.FieldDescriptorProto.Types.Type), typeof(global::Google.Protobuf.Reflection.FieldDescriptorProto.Types.Label) }, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.OneofDescriptorProto), global::Google.Protobuf.Reflection.OneofDescriptorProto.Parser, new[]{ "Name", "Options" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.EnumDescriptorProto), global::Google.Protobuf.Reflection.EnumDescriptorProto.Parser, new[]{ "Name", "Value", "Options" }, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.EnumDescriptorProto), global::Google.Protobuf.Reflection.EnumDescriptorProto.Parser, new[]{ "Name", "Value", "Options", "ReservedRange", "ReservedName" }, null, null, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange), global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange.Parser, new[]{ "Start", "End" }, null, null, null)}),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.EnumValueDescriptorProto), global::Google.Protobuf.Reflection.EnumValueDescriptorProto.Parser, new[]{ "Name", "Number", "Options" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.ServiceDescriptorProto), global::Google.Protobuf.Reflection.ServiceDescriptorProto.Parser, new[]{ "Name", "Method", "Options" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.MethodDescriptorProto), global::Google.Protobuf.Reflection.MethodDescriptorProto.Parser, new[]{ "Name", "InputType", "OutputType", "Options", "ClientStreaming", "ServerStreaming" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FileOptions), global::Google.Protobuf.Reflection.FileOptions.Parser, new[]{ "JavaPackage", "JavaOuterClassname", "JavaMultipleFiles", "JavaGenerateEqualsAndHash", "JavaStringCheckUtf8", "OptimizeFor", "GoPackage", "CcGenericServices", "JavaGenericServices", "PyGenericServices", "Deprecated", "CcEnableArenas", "ObjcClassPrefix", "CsharpNamespace", "SwiftPrefix", "UninterpretedOption" }, null, new[]{ typeof(global::Google.Protobuf.Reflection.FileOptions.Types.OptimizeMode) }, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FileOptions), global::Google.Protobuf.Reflection.FileOptions.Parser, new[]{ "JavaPackage", "JavaOuterClassname", "JavaMultipleFiles", "JavaGenerateEqualsAndHash", "JavaStringCheckUtf8", "OptimizeFor", "GoPackage", "CcGenericServices", "JavaGenericServices", "PyGenericServices", "PhpGenericServices", "Deprecated", "CcEnableArenas", "ObjcClassPrefix", "CsharpNamespace", "SwiftPrefix", "PhpClassPrefix", "PhpNamespace", "PhpMetadataNamespace", "RubyPackage", "UninterpretedOption" }, null, new[]{ typeof(global::Google.Protobuf.Reflection.FileOptions.Types.OptimizeMode) }, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.MessageOptions), global::Google.Protobuf.Reflection.MessageOptions.Parser, new[]{ "MessageSetWireFormat", "NoStandardDescriptorAccessor", "Deprecated", "MapEntry", "UninterpretedOption" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.FieldOptions), global::Google.Protobuf.Reflection.FieldOptions.Parser, new[]{ "Ctype", "Packed", "Jstype", "Lazy", "Deprecated", "Weak", "UninterpretedOption" }, null, new[]{ typeof(global::Google.Protobuf.Reflection.FieldOptions.Types.CType), typeof(global::Google.Protobuf.Reflection.FieldOptions.Types.JSType) }, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Reflection.OneofOptions), global::Google.Protobuf.Reflection.OneofOptions.Parser, new[]{ "UninterpretedOption" }, null, null, null),
@@ -182,6 +195,7 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class FileDescriptorSet : pb::IMessage<FileDescriptorSet> {
     private static readonly pb::MessageParser<FileDescriptorSet> _parser = new pb::MessageParser<FileDescriptorSet>(() => new FileDescriptorSet());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FileDescriptorSet> Parser { get { return _parser; } }
 
@@ -205,6 +219,7 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FileDescriptorSet(FileDescriptorSet other) : this() {
       file_ = other.file_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -236,13 +251,16 @@ namespace Google.Protobuf.Reflection {
         return true;
       }
       if(!file_.Equals(other.file_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= file_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -254,12 +272,18 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       file_.WriteTo(output, _repeated_file_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += file_.CalculateSize(_repeated_file_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -269,6 +293,7 @@ namespace Google.Protobuf.Reflection {
         return;
       }
       file_.Add(other.file_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -277,7 +302,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             file_.AddEntriesFrom(input, _repeated_file_codec);
@@ -294,6 +319,7 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class FileDescriptorProto : pb::IMessage<FileDescriptorProto> {
     private static readonly pb::MessageParser<FileDescriptorProto> _parser = new pb::MessageParser<FileDescriptorProto>(() => new FileDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FileDescriptorProto> Parser { get { return _parser; } }
 
@@ -325,9 +351,10 @@ namespace Google.Protobuf.Reflection {
       enumType_ = other.enumType_.Clone();
       service_ = other.service_.Clone();
       extension_ = other.extension_.Clone();
-      Options = other.options_ != null ? other.Options.Clone() : null;
-      SourceCodeInfo = other.sourceCodeInfo_ != null ? other.SourceCodeInfo.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      sourceCodeInfo_ = other.sourceCodeInfo_ != null ? other.sourceCodeInfo_.Clone() : null;
       syntax_ = other.syntax_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -514,7 +541,7 @@ namespace Google.Protobuf.Reflection {
       if (!object.Equals(Options, other.Options)) return false;
       if (!object.Equals(SourceCodeInfo, other.SourceCodeInfo)) return false;
       if (Syntax != other.Syntax) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -532,6 +559,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) hash ^= Options.GetHashCode();
       if (sourceCodeInfo_ != null) hash ^= SourceCodeInfo.GetHashCode();
       if (Syntax.Length != 0) hash ^= Syntax.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -569,6 +599,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(98);
         output.WriteString(Syntax);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -596,6 +629,9 @@ namespace Google.Protobuf.Reflection {
       if (Syntax.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Syntax);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -632,6 +668,7 @@ namespace Google.Protobuf.Reflection {
       if (other.Syntax.Length != 0) {
         Syntax = other.Syntax;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -640,7 +677,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -709,6 +746,7 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class DescriptorProto : pb::IMessage<DescriptorProto> {
     private static readonly pb::MessageParser<DescriptorProto> _parser = new pb::MessageParser<DescriptorProto>(() => new DescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DescriptorProto> Parser { get { return _parser; } }
 
@@ -738,9 +776,10 @@ namespace Google.Protobuf.Reflection {
       enumType_ = other.enumType_.Clone();
       extensionRange_ = other.extensionRange_.Clone();
       oneofDecl_ = other.oneofDecl_.Clone();
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
       reservedRange_ = other.reservedRange_.Clone();
       reservedName_ = other.reservedName_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -877,7 +916,7 @@ namespace Google.Protobuf.Reflection {
       if (!object.Equals(Options, other.Options)) return false;
       if(!reservedRange_.Equals(other.reservedRange_)) return false;
       if(!reservedName_.Equals(other.reservedName_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -893,6 +932,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) hash ^= Options.GetHashCode();
       hash ^= reservedRange_.GetHashCode();
       hash ^= reservedName_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -919,6 +961,9 @@ namespace Google.Protobuf.Reflection {
       oneofDecl_.WriteTo(output, _repeated_oneofDecl_codec);
       reservedRange_.WriteTo(output, _repeated_reservedRange_codec);
       reservedName_.WriteTo(output, _repeated_reservedName_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -938,6 +983,9 @@ namespace Google.Protobuf.Reflection {
       }
       size += reservedRange_.CalculateSize(_repeated_reservedRange_codec);
       size += reservedName_.CalculateSize(_repeated_reservedName_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -963,6 +1011,7 @@ namespace Google.Protobuf.Reflection {
       }
       reservedRange_.Add(other.reservedRange_);
       reservedName_.Add(other.reservedName_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -971,7 +1020,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1026,6 +1075,7 @@ namespace Google.Protobuf.Reflection {
     public static partial class Types {
       internal sealed partial class ExtensionRange : pb::IMessage<ExtensionRange> {
         private static readonly pb::MessageParser<ExtensionRange> _parser = new pb::MessageParser<ExtensionRange>(() => new ExtensionRange());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<ExtensionRange> Parser { get { return _parser; } }
 
@@ -1050,6 +1100,8 @@ namespace Google.Protobuf.Reflection {
         public ExtensionRange(ExtensionRange other) : this() {
           start_ = other.start_;
           end_ = other.end_;
+          options_ = other.options_ != null ? other.options_.Clone() : null;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1079,6 +1131,17 @@ namespace Google.Protobuf.Reflection {
           }
         }
 
+        /// <summary>Field number for the "options" field.</summary>
+        public const int OptionsFieldNumber = 3;
+        private global::Google.Protobuf.Reflection.ExtensionRangeOptions options_;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public global::Google.Protobuf.Reflection.ExtensionRangeOptions Options {
+          get { return options_; }
+          set {
+            options_ = value;
+          }
+        }
+
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override bool Equals(object other) {
           return Equals(other as ExtensionRange);
@@ -1094,7 +1157,8 @@ namespace Google.Protobuf.Reflection {
           }
           if (Start != other.Start) return false;
           if (End != other.End) return false;
-          return true;
+          if (!object.Equals(Options, other.Options)) return false;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1102,6 +1166,10 @@ namespace Google.Protobuf.Reflection {
           int hash = 1;
           if (Start != 0) hash ^= Start.GetHashCode();
           if (End != 0) hash ^= End.GetHashCode();
+          if (options_ != null) hash ^= Options.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -1120,6 +1188,13 @@ namespace Google.Protobuf.Reflection {
             output.WriteRawTag(16);
             output.WriteInt32(End);
           }
+          if (options_ != null) {
+            output.WriteRawTag(26);
+            output.WriteMessage(Options);
+          }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1131,6 +1206,12 @@ namespace Google.Protobuf.Reflection {
           if (End != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(End);
           }
+          if (options_ != null) {
+            size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
+          }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -1145,6 +1226,13 @@ namespace Google.Protobuf.Reflection {
           if (other.End != 0) {
             End = other.End;
           }
+          if (other.options_ != null) {
+            if (options_ == null) {
+              options_ = new global::Google.Protobuf.Reflection.ExtensionRangeOptions();
+            }
+            Options.MergeFrom(other.Options);
+          }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1153,7 +1241,7 @@ namespace Google.Protobuf.Reflection {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 Start = input.ReadInt32();
@@ -1163,6 +1251,13 @@ namespace Google.Protobuf.Reflection {
                 End = input.ReadInt32();
                 break;
               }
+              case 26: {
+                if (options_ == null) {
+                  options_ = new global::Google.Protobuf.Reflection.ExtensionRangeOptions();
+                }
+                input.ReadMessage(options_);
+                break;
+              }
             }
           }
         }
@@ -1176,6 +1271,7 @@ namespace Google.Protobuf.Reflection {
       /// </summary>
       internal sealed partial class ReservedRange : pb::IMessage<ReservedRange> {
         private static readonly pb::MessageParser<ReservedRange> _parser = new pb::MessageParser<ReservedRange>(() => new ReservedRange());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<ReservedRange> Parser { get { return _parser; } }
 
@@ -1200,6 +1296,7 @@ namespace Google.Protobuf.Reflection {
         public ReservedRange(ReservedRange other) : this() {
           start_ = other.start_;
           end_ = other.end_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1250,7 +1347,7 @@ namespace Google.Protobuf.Reflection {
           }
           if (Start != other.Start) return false;
           if (End != other.End) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1258,6 +1355,9 @@ namespace Google.Protobuf.Reflection {
           int hash = 1;
           if (Start != 0) hash ^= Start.GetHashCode();
           if (End != 0) hash ^= End.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -1276,6 +1376,9 @@ namespace Google.Protobuf.Reflection {
             output.WriteRawTag(16);
             output.WriteInt32(End);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1287,6 +1390,9 @@ namespace Google.Protobuf.Reflection {
           if (End != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(End);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -1301,6 +1407,7 @@ namespace Google.Protobuf.Reflection {
           if (other.End != 0) {
             End = other.End;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1309,7 +1416,7 @@ namespace Google.Protobuf.Reflection {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 8: {
                 Start = input.ReadInt32();
@@ -1330,17 +1437,142 @@ namespace Google.Protobuf.Reflection {
 
   }
 
+  internal sealed partial class ExtensionRangeOptions : pb::IMessage<ExtensionRangeOptions> {
+    private static readonly pb::MessageParser<ExtensionRangeOptions> _parser = new pb::MessageParser<ExtensionRangeOptions>(() => new ExtensionRangeOptions());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<ExtensionRangeOptions> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[3]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ExtensionRangeOptions() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ExtensionRangeOptions(ExtensionRangeOptions other) : this() {
+      uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ExtensionRangeOptions Clone() {
+      return new ExtensionRangeOptions(this);
+    }
+
+    /// <summary>Field number for the "uninterpreted_option" field.</summary>
+    public const int UninterpretedOptionFieldNumber = 999;
+    private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.UninterpretedOption> _repeated_uninterpretedOption_codec
+        = pb::FieldCodec.ForMessage(7994, global::Google.Protobuf.Reflection.UninterpretedOption.Parser);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption> uninterpretedOption_ = new pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption>();
+    /// <summary>
+    /// The parser stores options it doesn't recognize here. See above.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption> UninterpretedOption {
+      get { return uninterpretedOption_; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as ExtensionRangeOptions);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(ExtensionRangeOptions other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+      uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(ExtensionRangeOptions other) {
+      if (other == null) {
+        return;
+      }
+      uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+          case 7994: {
+            uninterpretedOption_.AddEntriesFrom(input, _repeated_uninterpretedOption_codec);
+            break;
+          }
+        }
+      }
+    }
+
+  }
+
   /// <summary>
   /// Describes a field within a message.
   /// </summary>
   internal sealed partial class FieldDescriptorProto : pb::IMessage<FieldDescriptorProto> {
     private static readonly pb::MessageParser<FieldDescriptorProto> _parser = new pb::MessageParser<FieldDescriptorProto>(() => new FieldDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FieldDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[3]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[4]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1366,7 +1598,8 @@ namespace Google.Protobuf.Reflection {
       defaultValue_ = other.defaultValue_;
       oneofIndex_ = other.oneofIndex_;
       jsonName_ = other.jsonName_;
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1539,7 +1772,7 @@ namespace Google.Protobuf.Reflection {
       if (OneofIndex != other.OneofIndex) return false;
       if (JsonName != other.JsonName) return false;
       if (!object.Equals(Options, other.Options)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1555,6 +1788,9 @@ namespace Google.Protobuf.Reflection {
       if (OneofIndex != 0) hash ^= OneofIndex.GetHashCode();
       if (JsonName.Length != 0) hash ^= JsonName.GetHashCode();
       if (options_ != null) hash ^= Options.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1605,6 +1841,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(82);
         output.WriteString(JsonName);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1640,6 +1879,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1681,6 +1923,7 @@ namespace Google.Protobuf.Reflection {
         }
         Options.MergeFrom(other.Options);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1689,7 +1932,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1812,12 +2055,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class OneofDescriptorProto : pb::IMessage<OneofDescriptorProto> {
     private static readonly pb::MessageParser<OneofDescriptorProto> _parser = new pb::MessageParser<OneofDescriptorProto>(() => new OneofDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<OneofDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[4]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[5]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1835,7 +2079,8 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public OneofDescriptorProto(OneofDescriptorProto other) : this() {
       name_ = other.name_;
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1880,7 +2125,7 @@ namespace Google.Protobuf.Reflection {
       }
       if (Name != other.Name) return false;
       if (!object.Equals(Options, other.Options)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1888,6 +2133,9 @@ namespace Google.Protobuf.Reflection {
       int hash = 1;
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (options_ != null) hash ^= Options.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1906,6 +2154,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(18);
         output.WriteMessage(Options);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1917,6 +2168,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1934,6 +2188,7 @@ namespace Google.Protobuf.Reflection {
         }
         Options.MergeFrom(other.Options);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1942,7 +2197,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1966,12 +2221,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class EnumDescriptorProto : pb::IMessage<EnumDescriptorProto> {
     private static readonly pb::MessageParser<EnumDescriptorProto> _parser = new pb::MessageParser<EnumDescriptorProto>(() => new EnumDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<EnumDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[5]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[6]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1990,7 +2246,10 @@ namespace Google.Protobuf.Reflection {
     public EnumDescriptorProto(EnumDescriptorProto other) : this() {
       name_ = other.name_;
       value_ = other.value_.Clone();
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      reservedRange_ = other.reservedRange_.Clone();
+      reservedName_ = other.reservedName_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2030,6 +2289,35 @@ namespace Google.Protobuf.Reflection {
       }
     }
 
+    /// <summary>Field number for the "reserved_range" field.</summary>
+    public const int ReservedRangeFieldNumber = 4;
+    private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange> _repeated_reservedRange_codec
+        = pb::FieldCodec.ForMessage(34, global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange.Parser);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange> reservedRange_ = new pbc::RepeatedField<global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange>();
+    /// <summary>
+    /// Range of reserved numeric values. Reserved numeric values may not be used
+    /// by enum values in the same enum declaration. Reserved ranges may not
+    /// overlap.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<global::Google.Protobuf.Reflection.EnumDescriptorProto.Types.EnumReservedRange> ReservedRange {
+      get { return reservedRange_; }
+    }
+
+    /// <summary>Field number for the "reserved_name" field.</summary>
+    public const int ReservedNameFieldNumber = 5;
+    private static readonly pb::FieldCodec<string> _repeated_reservedName_codec
+        = pb::FieldCodec.ForString(42);
+    private readonly pbc::RepeatedField<string> reservedName_ = new pbc::RepeatedField<string>();
+    /// <summary>
+    /// Reserved enum value names, which may not be reused. A given name may only
+    /// be reserved once.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<string> ReservedName {
+      get { return reservedName_; }
+    }
+
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override bool Equals(object other) {
       return Equals(other as EnumDescriptorProto);
@@ -2046,7 +2334,9 @@ namespace Google.Protobuf.Reflection {
       if (Name != other.Name) return false;
       if(!value_.Equals(other.value_)) return false;
       if (!object.Equals(Options, other.Options)) return false;
-      return true;
+      if(!reservedRange_.Equals(other.reservedRange_)) return false;
+      if(!reservedName_.Equals(other.reservedName_)) return false;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2055,6 +2345,11 @@ namespace Google.Protobuf.Reflection {
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       hash ^= value_.GetHashCode();
       if (options_ != null) hash ^= Options.GetHashCode();
+      hash ^= reservedRange_.GetHashCode();
+      hash ^= reservedName_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2074,6 +2369,11 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(26);
         output.WriteMessage(Options);
       }
+      reservedRange_.WriteTo(output, _repeated_reservedRange_codec);
+      reservedName_.WriteTo(output, _repeated_reservedName_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2086,6 +2386,11 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
       }
+      size += reservedRange_.CalculateSize(_repeated_reservedRange_codec);
+      size += reservedName_.CalculateSize(_repeated_reservedName_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2104,6 +2409,9 @@ namespace Google.Protobuf.Reflection {
         }
         Options.MergeFrom(other.Options);
       }
+      reservedRange_.Add(other.reservedRange_);
+      reservedName_.Add(other.reservedName_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2112,7 +2420,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -2129,9 +2437,195 @@ namespace Google.Protobuf.Reflection {
             input.ReadMessage(options_);
             break;
           }
+          case 34: {
+            reservedRange_.AddEntriesFrom(input, _repeated_reservedRange_codec);
+            break;
+          }
+          case 42: {
+            reservedName_.AddEntriesFrom(input, _repeated_reservedName_codec);
+            break;
+          }
+        }
+      }
+    }
+
+    #region Nested types
+    /// <summary>Container for nested types declared in the EnumDescriptorProto message type.</summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static partial class Types {
+      /// <summary>
+      /// Range of reserved numeric values. Reserved values may not be used by
+      /// entries in the same enum. Reserved ranges may not overlap.
+      ///
+      /// Note that this is distinct from DescriptorProto.ReservedRange in that it
+      /// is inclusive such that it can appropriately represent the entire int32
+      /// domain.
+      /// </summary>
+      internal sealed partial class EnumReservedRange : pb::IMessage<EnumReservedRange> {
+        private static readonly pb::MessageParser<EnumReservedRange> _parser = new pb::MessageParser<EnumReservedRange>(() => new EnumReservedRange());
+        private pb::UnknownFieldSet _unknownFields;
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pb::MessageParser<EnumReservedRange> Parser { get { return _parser; } }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public static pbr::MessageDescriptor Descriptor {
+          get { return global::Google.Protobuf.Reflection.EnumDescriptorProto.Descriptor.NestedTypes[0]; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public EnumReservedRange() {
+          OnConstruction();
+        }
+
+        partial void OnConstruction();
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public EnumReservedRange(EnumReservedRange other) : this() {
+          start_ = other.start_;
+          end_ = other.end_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public EnumReservedRange Clone() {
+          return new EnumReservedRange(this);
+        }
+
+        /// <summary>Field number for the "start" field.</summary>
+        public const int StartFieldNumber = 1;
+        private int start_;
+        /// <summary>
+        /// Inclusive.
+        /// </summary>
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int Start {
+          get { return start_; }
+          set {
+            start_ = value;
+          }
+        }
+
+        /// <summary>Field number for the "end" field.</summary>
+        public const int EndFieldNumber = 2;
+        private int end_;
+        /// <summary>
+        /// Inclusive.
+        /// </summary>
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int End {
+          get { return end_; }
+          set {
+            end_ = value;
+          }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override bool Equals(object other) {
+          return Equals(other as EnumReservedRange);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public bool Equals(EnumReservedRange other) {
+          if (ReferenceEquals(other, null)) {
+            return false;
+          }
+          if (ReferenceEquals(other, this)) {
+            return true;
+          }
+          if (Start != other.Start) return false;
+          if (End != other.End) return false;
+          return Equals(_unknownFields, other._unknownFields);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override int GetHashCode() {
+          int hash = 1;
+          if (Start != 0) hash ^= Start.GetHashCode();
+          if (End != 0) hash ^= End.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
+          return hash;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public override string ToString() {
+          return pb::JsonFormatter.ToDiagnosticString(this);
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void WriteTo(pb::CodedOutputStream output) {
+          if (Start != 0) {
+            output.WriteRawTag(8);
+            output.WriteInt32(Start);
+          }
+          if (End != 0) {
+            output.WriteRawTag(16);
+            output.WriteInt32(End);
+          }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public int CalculateSize() {
+          int size = 0;
+          if (Start != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeInt32Size(Start);
+          }
+          if (End != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeInt32Size(End);
+          }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
+          return size;
+        }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(EnumReservedRange other) {
+          if (other == null) {
+            return;
+          }
+          if (other.Start != 0) {
+            Start = other.Start;
+          }
+          if (other.End != 0) {
+            End = other.End;
+          }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
+
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public void MergeFrom(pb::CodedInputStream input) {
+          uint tag;
+          while ((tag = input.ReadTag()) != 0) {
+            switch(tag) {
+              default:
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+                break;
+              case 8: {
+                Start = input.ReadInt32();
+                break;
+              }
+              case 16: {
+                End = input.ReadInt32();
+                break;
+              }
+            }
+          }
+        }
+
       }
+
     }
+    #endregion
 
   }
 
@@ -2140,12 +2634,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class EnumValueDescriptorProto : pb::IMessage<EnumValueDescriptorProto> {
     private static readonly pb::MessageParser<EnumValueDescriptorProto> _parser = new pb::MessageParser<EnumValueDescriptorProto>(() => new EnumValueDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<EnumValueDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[6]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[7]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2164,7 +2659,8 @@ namespace Google.Protobuf.Reflection {
     public EnumValueDescriptorProto(EnumValueDescriptorProto other) : this() {
       name_ = other.name_;
       number_ = other.number_;
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2221,7 +2717,7 @@ namespace Google.Protobuf.Reflection {
       if (Name != other.Name) return false;
       if (Number != other.Number) return false;
       if (!object.Equals(Options, other.Options)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2230,6 +2726,9 @@ namespace Google.Protobuf.Reflection {
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (Number != 0) hash ^= Number.GetHashCode();
       if (options_ != null) hash ^= Options.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2252,6 +2751,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(26);
         output.WriteMessage(Options);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2266,6 +2768,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2286,6 +2791,7 @@ namespace Google.Protobuf.Reflection {
         }
         Options.MergeFrom(other.Options);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2294,7 +2800,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -2322,12 +2828,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class ServiceDescriptorProto : pb::IMessage<ServiceDescriptorProto> {
     private static readonly pb::MessageParser<ServiceDescriptorProto> _parser = new pb::MessageParser<ServiceDescriptorProto>(() => new ServiceDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ServiceDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[7]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[8]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2346,7 +2853,8 @@ namespace Google.Protobuf.Reflection {
     public ServiceDescriptorProto(ServiceDescriptorProto other) : this() {
       name_ = other.name_;
       method_ = other.method_.Clone();
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2402,7 +2910,7 @@ namespace Google.Protobuf.Reflection {
       if (Name != other.Name) return false;
       if(!method_.Equals(other.method_)) return false;
       if (!object.Equals(Options, other.Options)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2411,6 +2919,9 @@ namespace Google.Protobuf.Reflection {
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       hash ^= method_.GetHashCode();
       if (options_ != null) hash ^= Options.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2430,6 +2941,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(26);
         output.WriteMessage(Options);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2442,6 +2956,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Options);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2460,6 +2977,7 @@ namespace Google.Protobuf.Reflection {
         }
         Options.MergeFrom(other.Options);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2468,7 +2986,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -2496,12 +3014,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class MethodDescriptorProto : pb::IMessage<MethodDescriptorProto> {
     private static readonly pb::MessageParser<MethodDescriptorProto> _parser = new pb::MessageParser<MethodDescriptorProto>(() => new MethodDescriptorProto());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MethodDescriptorProto> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[8]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[9]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2521,9 +3040,10 @@ namespace Google.Protobuf.Reflection {
       name_ = other.name_;
       inputType_ = other.inputType_;
       outputType_ = other.outputType_;
-      Options = other.options_ != null ? other.Options.Clone() : null;
+      options_ = other.options_ != null ? other.options_.Clone() : null;
       clientStreaming_ = other.clientStreaming_;
       serverStreaming_ = other.serverStreaming_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2626,7 +3146,7 @@ namespace Google.Protobuf.Reflection {
       if (!object.Equals(Options, other.Options)) return false;
       if (ClientStreaming != other.ClientStreaming) return false;
       if (ServerStreaming != other.ServerStreaming) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2638,6 +3158,9 @@ namespace Google.Protobuf.Reflection {
       if (options_ != null) hash ^= Options.GetHashCode();
       if (ClientStreaming != false) hash ^= ClientStreaming.GetHashCode();
       if (ServerStreaming != false) hash ^= ServerStreaming.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -2672,6 +3195,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(48);
         output.WriteBool(ServerStreaming);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2695,6 +3221,9 @@ namespace Google.Protobuf.Reflection {
       if (ServerStreaming != false) {
         size += 1 + 1;
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -2724,6 +3253,7 @@ namespace Google.Protobuf.Reflection {
       if (other.ServerStreaming != false) {
         ServerStreaming = other.ServerStreaming;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2732,7 +3262,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -2769,12 +3299,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class FileOptions : pb::IMessage<FileOptions> {
     private static readonly pb::MessageParser<FileOptions> _parser = new pb::MessageParser<FileOptions>(() => new FileOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FileOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[9]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[10]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2803,12 +3334,18 @@ namespace Google.Protobuf.Reflection {
       ccGenericServices_ = other.ccGenericServices_;
       javaGenericServices_ = other.javaGenericServices_;
       pyGenericServices_ = other.pyGenericServices_;
+      phpGenericServices_ = other.phpGenericServices_;
       deprecated_ = other.deprecated_;
       ccEnableArenas_ = other.ccEnableArenas_;
       objcClassPrefix_ = other.objcClassPrefix_;
       csharpNamespace_ = other.csharpNamespace_;
       swiftPrefix_ = other.swiftPrefix_;
+      phpClassPrefix_ = other.phpClassPrefix_;
+      phpNamespace_ = other.phpNamespace_;
+      phpMetadataNamespace_ = other.phpMetadataNamespace_;
+      rubyPackage_ = other.rubyPackage_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2978,6 +3515,17 @@ namespace Google.Protobuf.Reflection {
       }
     }
 
+    /// <summary>Field number for the "php_generic_services" field.</summary>
+    public const int PhpGenericServicesFieldNumber = 42;
+    private bool phpGenericServices_;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool PhpGenericServices {
+      get { return phpGenericServices_; }
+      set {
+        phpGenericServices_ = value;
+      }
+    }
+
     /// <summary>Field number for the "deprecated" field.</summary>
     public const int DeprecatedFieldNumber = 23;
     private bool deprecated_;
@@ -3056,13 +3604,77 @@ namespace Google.Protobuf.Reflection {
       }
     }
 
+    /// <summary>Field number for the "php_class_prefix" field.</summary>
+    public const int PhpClassPrefixFieldNumber = 40;
+    private string phpClassPrefix_ = "";
+    /// <summary>
+    /// Sets the php class prefix which is prepended to all php generated classes
+    /// from this .proto. Default is empty.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string PhpClassPrefix {
+      get { return phpClassPrefix_; }
+      set {
+        phpClassPrefix_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "php_namespace" field.</summary>
+    public const int PhpNamespaceFieldNumber = 41;
+    private string phpNamespace_ = "";
+    /// <summary>
+    /// Use this option to change the namespace of php generated classes. Default
+    /// is empty. When this option is empty, the package name will be used for
+    /// determining the namespace.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string PhpNamespace {
+      get { return phpNamespace_; }
+      set {
+        phpNamespace_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "php_metadata_namespace" field.</summary>
+    public const int PhpMetadataNamespaceFieldNumber = 44;
+    private string phpMetadataNamespace_ = "";
+    /// <summary>
+    /// Use this option to change the namespace of php generated metadata classes.
+    /// Default is empty. When this option is empty, the proto file name will be used
+    /// for determining the namespace.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string PhpMetadataNamespace {
+      get { return phpMetadataNamespace_; }
+      set {
+        phpMetadataNamespace_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "ruby_package" field.</summary>
+    public const int RubyPackageFieldNumber = 45;
+    private string rubyPackage_ = "";
+    /// <summary>
+    /// Use this option to change the package of ruby generated classes. Default
+    /// is empty. When this option is not set, the package name will be used for
+    /// determining the ruby package.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string RubyPackage {
+      get { return rubyPackage_; }
+      set {
+        rubyPackage_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
     /// <summary>Field number for the "uninterpreted_option" field.</summary>
     public const int UninterpretedOptionFieldNumber = 999;
     private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.UninterpretedOption> _repeated_uninterpretedOption_codec
         = pb::FieldCodec.ForMessage(7994, global::Google.Protobuf.Reflection.UninterpretedOption.Parser);
     private readonly pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption> uninterpretedOption_ = new pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption>();
     /// <summary>
-    /// The parser stores options it doesn't recognize here. See above.
+    /// The parser stores options it doesn't recognize here.
+    /// See the documentation for the "Options" section above.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Google.Protobuf.Reflection.UninterpretedOption> UninterpretedOption {
@@ -3092,13 +3704,18 @@ namespace Google.Protobuf.Reflection {
       if (CcGenericServices != other.CcGenericServices) return false;
       if (JavaGenericServices != other.JavaGenericServices) return false;
       if (PyGenericServices != other.PyGenericServices) return false;
+      if (PhpGenericServices != other.PhpGenericServices) return false;
       if (Deprecated != other.Deprecated) return false;
       if (CcEnableArenas != other.CcEnableArenas) return false;
       if (ObjcClassPrefix != other.ObjcClassPrefix) return false;
       if (CsharpNamespace != other.CsharpNamespace) return false;
       if (SwiftPrefix != other.SwiftPrefix) return false;
+      if (PhpClassPrefix != other.PhpClassPrefix) return false;
+      if (PhpNamespace != other.PhpNamespace) return false;
+      if (PhpMetadataNamespace != other.PhpMetadataNamespace) return false;
+      if (RubyPackage != other.RubyPackage) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3114,12 +3731,20 @@ namespace Google.Protobuf.Reflection {
       if (CcGenericServices != false) hash ^= CcGenericServices.GetHashCode();
       if (JavaGenericServices != false) hash ^= JavaGenericServices.GetHashCode();
       if (PyGenericServices != false) hash ^= PyGenericServices.GetHashCode();
+      if (PhpGenericServices != false) hash ^= PhpGenericServices.GetHashCode();
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       if (CcEnableArenas != false) hash ^= CcEnableArenas.GetHashCode();
       if (ObjcClassPrefix.Length != 0) hash ^= ObjcClassPrefix.GetHashCode();
       if (CsharpNamespace.Length != 0) hash ^= CsharpNamespace.GetHashCode();
       if (SwiftPrefix.Length != 0) hash ^= SwiftPrefix.GetHashCode();
+      if (PhpClassPrefix.Length != 0) hash ^= PhpClassPrefix.GetHashCode();
+      if (PhpNamespace.Length != 0) hash ^= PhpNamespace.GetHashCode();
+      if (PhpMetadataNamespace.Length != 0) hash ^= PhpMetadataNamespace.GetHashCode();
+      if (RubyPackage.Length != 0) hash ^= RubyPackage.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3190,7 +3815,30 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(186, 2);
         output.WriteString(SwiftPrefix);
       }
+      if (PhpClassPrefix.Length != 0) {
+        output.WriteRawTag(194, 2);
+        output.WriteString(PhpClassPrefix);
+      }
+      if (PhpNamespace.Length != 0) {
+        output.WriteRawTag(202, 2);
+        output.WriteString(PhpNamespace);
+      }
+      if (PhpGenericServices != false) {
+        output.WriteRawTag(208, 2);
+        output.WriteBool(PhpGenericServices);
+      }
+      if (PhpMetadataNamespace.Length != 0) {
+        output.WriteRawTag(226, 2);
+        output.WriteString(PhpMetadataNamespace);
+      }
+      if (RubyPackage.Length != 0) {
+        output.WriteRawTag(234, 2);
+        output.WriteString(RubyPackage);
+      }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3226,6 +3874,9 @@ namespace Google.Protobuf.Reflection {
       if (PyGenericServices != false) {
         size += 2 + 1;
       }
+      if (PhpGenericServices != false) {
+        size += 2 + 1;
+      }
       if (Deprecated != false) {
         size += 2 + 1;
       }
@@ -3241,7 +3892,22 @@ namespace Google.Protobuf.Reflection {
       if (SwiftPrefix.Length != 0) {
         size += 2 + pb::CodedOutputStream.ComputeStringSize(SwiftPrefix);
       }
+      if (PhpClassPrefix.Length != 0) {
+        size += 2 + pb::CodedOutputStream.ComputeStringSize(PhpClassPrefix);
+      }
+      if (PhpNamespace.Length != 0) {
+        size += 2 + pb::CodedOutputStream.ComputeStringSize(PhpNamespace);
+      }
+      if (PhpMetadataNamespace.Length != 0) {
+        size += 2 + pb::CodedOutputStream.ComputeStringSize(PhpMetadataNamespace);
+      }
+      if (RubyPackage.Length != 0) {
+        size += 2 + pb::CodedOutputStream.ComputeStringSize(RubyPackage);
+      }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3280,6 +3946,9 @@ namespace Google.Protobuf.Reflection {
       if (other.PyGenericServices != false) {
         PyGenericServices = other.PyGenericServices;
       }
+      if (other.PhpGenericServices != false) {
+        PhpGenericServices = other.PhpGenericServices;
+      }
       if (other.Deprecated != false) {
         Deprecated = other.Deprecated;
       }
@@ -3295,7 +3964,20 @@ namespace Google.Protobuf.Reflection {
       if (other.SwiftPrefix.Length != 0) {
         SwiftPrefix = other.SwiftPrefix;
       }
+      if (other.PhpClassPrefix.Length != 0) {
+        PhpClassPrefix = other.PhpClassPrefix;
+      }
+      if (other.PhpNamespace.Length != 0) {
+        PhpNamespace = other.PhpNamespace;
+      }
+      if (other.PhpMetadataNamespace.Length != 0) {
+        PhpMetadataNamespace = other.PhpMetadataNamespace;
+      }
+      if (other.RubyPackage.Length != 0) {
+        RubyPackage = other.RubyPackage;
+      }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3366,6 +4048,26 @@ namespace Google.Protobuf.Reflection {
             SwiftPrefix = input.ReadString();
             break;
           }
+          case 322: {
+            PhpClassPrefix = input.ReadString();
+            break;
+          }
+          case 330: {
+            PhpNamespace = input.ReadString();
+            break;
+          }
+          case 336: {
+            PhpGenericServices = input.ReadBool();
+            break;
+          }
+          case 354: {
+            PhpMetadataNamespace = input.ReadString();
+            break;
+          }
+          case 362: {
+            RubyPackage = input.ReadString();
+            break;
+          }
           case 7994: {
             uninterpretedOption_.AddEntriesFrom(input, _repeated_uninterpretedOption_codec);
             break;
@@ -3403,12 +4105,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class MessageOptions : pb::IMessage<MessageOptions> {
     private static readonly pb::MessageParser<MessageOptions> _parser = new pb::MessageParser<MessageOptions>(() => new MessageOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MessageOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[10]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[11]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3432,6 +4135,7 @@ namespace Google.Protobuf.Reflection {
       deprecated_ = other.deprecated_;
       mapEntry_ = other.mapEntry_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3568,7 +4272,7 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != other.Deprecated) return false;
       if (MapEntry != other.MapEntry) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3579,6 +4283,9 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       if (MapEntry != false) hash ^= MapEntry.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3606,6 +4313,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteBool(MapEntry);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3624,6 +4334,9 @@ namespace Google.Protobuf.Reflection {
         size += 1 + 1;
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3645,6 +4358,7 @@ namespace Google.Protobuf.Reflection {
         MapEntry = other.MapEntry;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3683,12 +4397,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class FieldOptions : pb::IMessage<FieldOptions> {
     private static readonly pb::MessageParser<FieldOptions> _parser = new pb::MessageParser<FieldOptions>(() => new FieldOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FieldOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[11]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[12]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3714,6 +4429,7 @@ namespace Google.Protobuf.Reflection {
       deprecated_ = other.deprecated_;
       weak_ = other.weak_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3762,13 +4478,15 @@ namespace Google.Protobuf.Reflection {
     /// <summary>
     /// The jstype option determines the JavaScript type used for values of the
     /// field.  The option is permitted only for 64 bit integral and fixed types
-    /// (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-    /// represented as JavaScript strings.  This avoids loss of precision that can
-    /// happen when a large value is converted to a floating point JavaScript
-    /// numbers.  Specifying JS_NUMBER for the jstype causes the generated
-    /// JavaScript code to use the JavaScript "number" type instead of strings.
-    /// This option is an enum to permit additional types to be added,
-    /// e.g. goog.math.Integer.
+    /// (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+    /// is represented as JavaScript string, which avoids loss of precision that
+    /// can happen when a large value is converted to a floating point JavaScript.
+    /// Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+    /// use the JavaScript "number" type.  The behavior of the default option
+    /// JS_NORMAL is implementation dependent.
+    ///
+    /// This option is an enum to permit additional types to be added, e.g.
+    /// goog.math.Integer.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Google.Protobuf.Reflection.FieldOptions.Types.JSType Jstype {
@@ -3882,7 +4600,7 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != other.Deprecated) return false;
       if (Weak != other.Weak) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3895,6 +4613,9 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       if (Weak != false) hash ^= Weak.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -3930,6 +4651,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteBool(Weak);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3954,6 +4678,9 @@ namespace Google.Protobuf.Reflection {
         size += 1 + 1;
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -3981,6 +4708,7 @@ namespace Google.Protobuf.Reflection {
         Weak = other.Weak;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4058,12 +4786,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class OneofOptions : pb::IMessage<OneofOptions> {
     private static readonly pb::MessageParser<OneofOptions> _parser = new pb::MessageParser<OneofOptions>(() => new OneofOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<OneofOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[12]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[13]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4083,6 +4812,7 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public OneofOptions(OneofOptions other) : this() {
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4117,13 +4847,16 @@ namespace Google.Protobuf.Reflection {
         return true;
       }
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4135,12 +4868,18 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4150,6 +4889,7 @@ namespace Google.Protobuf.Reflection {
         return;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4172,12 +4912,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class EnumOptions : pb::IMessage<EnumOptions> {
     private static readonly pb::MessageParser<EnumOptions> _parser = new pb::MessageParser<EnumOptions>(() => new EnumOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<EnumOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[13]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[14]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4199,6 +4940,7 @@ namespace Google.Protobuf.Reflection {
       allowAlias_ = other.allowAlias_;
       deprecated_ = other.deprecated_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4267,7 +5009,7 @@ namespace Google.Protobuf.Reflection {
       if (AllowAlias != other.AllowAlias) return false;
       if (Deprecated != other.Deprecated) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4276,6 +5018,9 @@ namespace Google.Protobuf.Reflection {
       if (AllowAlias != false) hash ^= AllowAlias.GetHashCode();
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4295,6 +5040,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteBool(Deprecated);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4307,6 +5055,9 @@ namespace Google.Protobuf.Reflection {
         size += 1 + 1;
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4322,6 +5073,7 @@ namespace Google.Protobuf.Reflection {
         Deprecated = other.Deprecated;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4352,12 +5104,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class EnumValueOptions : pb::IMessage<EnumValueOptions> {
     private static readonly pb::MessageParser<EnumValueOptions> _parser = new pb::MessageParser<EnumValueOptions>(() => new EnumValueOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<EnumValueOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[14]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[15]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4378,6 +5131,7 @@ namespace Google.Protobuf.Reflection {
     public EnumValueOptions(EnumValueOptions other) : this() {
       deprecated_ = other.deprecated_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4430,7 +5184,7 @@ namespace Google.Protobuf.Reflection {
       }
       if (Deprecated != other.Deprecated) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4438,6 +5192,9 @@ namespace Google.Protobuf.Reflection {
       int hash = 1;
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4453,6 +5210,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteBool(Deprecated);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4462,6 +5222,9 @@ namespace Google.Protobuf.Reflection {
         size += 1 + 1;
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4474,6 +5237,7 @@ namespace Google.Protobuf.Reflection {
         Deprecated = other.Deprecated;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4500,12 +5264,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class ServiceOptions : pb::IMessage<ServiceOptions> {
     private static readonly pb::MessageParser<ServiceOptions> _parser = new pb::MessageParser<ServiceOptions>(() => new ServiceOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ServiceOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[15]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[16]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4526,6 +5291,7 @@ namespace Google.Protobuf.Reflection {
     public ServiceOptions(ServiceOptions other) : this() {
       deprecated_ = other.deprecated_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4578,7 +5344,7 @@ namespace Google.Protobuf.Reflection {
       }
       if (Deprecated != other.Deprecated) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4586,6 +5352,9 @@ namespace Google.Protobuf.Reflection {
       int hash = 1;
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4601,6 +5370,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteBool(Deprecated);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4610,6 +5382,9 @@ namespace Google.Protobuf.Reflection {
         size += 2 + 1;
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4622,6 +5397,7 @@ namespace Google.Protobuf.Reflection {
         Deprecated = other.Deprecated;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4648,12 +5424,13 @@ namespace Google.Protobuf.Reflection {
 
   internal sealed partial class MethodOptions : pb::IMessage<MethodOptions> {
     private static readonly pb::MessageParser<MethodOptions> _parser = new pb::MessageParser<MethodOptions>(() => new MethodOptions());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<MethodOptions> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[16]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[17]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4675,6 +5452,7 @@ namespace Google.Protobuf.Reflection {
       deprecated_ = other.deprecated_;
       idempotencyLevel_ = other.idempotencyLevel_;
       uninterpretedOption_ = other.uninterpretedOption_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4739,7 +5517,7 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != other.Deprecated) return false;
       if (IdempotencyLevel != other.IdempotencyLevel) return false;
       if(!uninterpretedOption_.Equals(other.uninterpretedOption_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4748,6 +5526,9 @@ namespace Google.Protobuf.Reflection {
       if (Deprecated != false) hash ^= Deprecated.GetHashCode();
       if (IdempotencyLevel != 0) hash ^= IdempotencyLevel.GetHashCode();
       hash ^= uninterpretedOption_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -4767,6 +5548,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteEnum((int) IdempotencyLevel);
       }
       uninterpretedOption_.WriteTo(output, _repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4779,6 +5563,9 @@ namespace Google.Protobuf.Reflection {
         size += 2 + pb::CodedOutputStream.ComputeEnumSize((int) IdempotencyLevel);
       }
       size += uninterpretedOption_.CalculateSize(_repeated_uninterpretedOption_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -4794,6 +5581,7 @@ namespace Google.Protobuf.Reflection {
         IdempotencyLevel = other.IdempotencyLevel;
       }
       uninterpretedOption_.Add(other.uninterpretedOption_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4856,12 +5644,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class UninterpretedOption : pb::IMessage<UninterpretedOption> {
     private static readonly pb::MessageParser<UninterpretedOption> _parser = new pb::MessageParser<UninterpretedOption>(() => new UninterpretedOption());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<UninterpretedOption> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[17]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[18]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4885,6 +5674,7 @@ namespace Google.Protobuf.Reflection {
       doubleValue_ = other.doubleValue_;
       stringValue_ = other.stringValue_;
       aggregateValue_ = other.aggregateValue_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4989,10 +5779,10 @@ namespace Google.Protobuf.Reflection {
       if (IdentifierValue != other.IdentifierValue) return false;
       if (PositiveIntValue != other.PositiveIntValue) return false;
       if (NegativeIntValue != other.NegativeIntValue) return false;
-      if (DoubleValue != other.DoubleValue) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(DoubleValue, other.DoubleValue)) return false;
       if (StringValue != other.StringValue) return false;
       if (AggregateValue != other.AggregateValue) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5002,9 +5792,12 @@ namespace Google.Protobuf.Reflection {
       if (IdentifierValue.Length != 0) hash ^= IdentifierValue.GetHashCode();
       if (PositiveIntValue != 0UL) hash ^= PositiveIntValue.GetHashCode();
       if (NegativeIntValue != 0L) hash ^= NegativeIntValue.GetHashCode();
-      if (DoubleValue != 0D) hash ^= DoubleValue.GetHashCode();
+      if (DoubleValue != 0D) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(DoubleValue);
       if (StringValue.Length != 0) hash ^= StringValue.GetHashCode();
       if (AggregateValue.Length != 0) hash ^= AggregateValue.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5040,6 +5833,9 @@ namespace Google.Protobuf.Reflection {
         output.WriteRawTag(66);
         output.WriteString(AggregateValue);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5064,6 +5860,9 @@ namespace Google.Protobuf.Reflection {
       if (AggregateValue.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(AggregateValue);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5091,6 +5890,7 @@ namespace Google.Protobuf.Reflection {
       if (other.AggregateValue.Length != 0) {
         AggregateValue = other.AggregateValue;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5099,7 +5899,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 18: {
             name_.AddEntriesFrom(input, _repeated_name_codec);
@@ -5146,6 +5946,7 @@ namespace Google.Protobuf.Reflection {
       /// </summary>
       internal sealed partial class NamePart : pb::IMessage<NamePart> {
         private static readonly pb::MessageParser<NamePart> _parser = new pb::MessageParser<NamePart>(() => new NamePart());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<NamePart> Parser { get { return _parser; } }
 
@@ -5170,6 +5971,7 @@ namespace Google.Protobuf.Reflection {
         public NamePart(NamePart other) : this() {
           namePart_ = other.namePart_;
           isExtension_ = other.isExtension_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5214,7 +6016,7 @@ namespace Google.Protobuf.Reflection {
           }
           if (NamePart_ != other.NamePart_) return false;
           if (IsExtension != other.IsExtension) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5222,6 +6024,9 @@ namespace Google.Protobuf.Reflection {
           int hash = 1;
           if (NamePart_.Length != 0) hash ^= NamePart_.GetHashCode();
           if (IsExtension != false) hash ^= IsExtension.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -5240,6 +6045,9 @@ namespace Google.Protobuf.Reflection {
             output.WriteRawTag(16);
             output.WriteBool(IsExtension);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5251,6 +6059,9 @@ namespace Google.Protobuf.Reflection {
           if (IsExtension != false) {
             size += 1 + 1;
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -5265,6 +6076,7 @@ namespace Google.Protobuf.Reflection {
           if (other.IsExtension != false) {
             IsExtension = other.IsExtension;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5273,7 +6085,7 @@ namespace Google.Protobuf.Reflection {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 10: {
                 NamePart_ = input.ReadString();
@@ -5300,12 +6112,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class SourceCodeInfo : pb::IMessage<SourceCodeInfo> {
     private static readonly pb::MessageParser<SourceCodeInfo> _parser = new pb::MessageParser<SourceCodeInfo>(() => new SourceCodeInfo());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<SourceCodeInfo> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[18]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[19]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5323,6 +6136,7 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public SourceCodeInfo(SourceCodeInfo other) : this() {
       location_ = other.location_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5399,13 +6213,16 @@ namespace Google.Protobuf.Reflection {
         return true;
       }
       if(!location_.Equals(other.location_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= location_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5417,12 +6234,18 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       location_.WriteTo(output, _repeated_location_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += location_.CalculateSize(_repeated_location_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5432,6 +6255,7 @@ namespace Google.Protobuf.Reflection {
         return;
       }
       location_.Add(other.location_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5440,7 +6264,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             location_.AddEntriesFrom(input, _repeated_location_codec);
@@ -5456,6 +6280,7 @@ namespace Google.Protobuf.Reflection {
     public static partial class Types {
       internal sealed partial class Location : pb::IMessage<Location> {
         private static readonly pb::MessageParser<Location> _parser = new pb::MessageParser<Location>(() => new Location());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<Location> Parser { get { return _parser; } }
 
@@ -5483,6 +6308,7 @@ namespace Google.Protobuf.Reflection {
           leadingComments_ = other.leadingComments_;
           trailingComments_ = other.trailingComments_;
           leadingDetachedComments_ = other.leadingDetachedComments_.Clone();
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5641,7 +6467,7 @@ namespace Google.Protobuf.Reflection {
           if (LeadingComments != other.LeadingComments) return false;
           if (TrailingComments != other.TrailingComments) return false;
           if(!leadingDetachedComments_.Equals(other.leadingDetachedComments_)) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5652,6 +6478,9 @@ namespace Google.Protobuf.Reflection {
           if (LeadingComments.Length != 0) hash ^= LeadingComments.GetHashCode();
           if (TrailingComments.Length != 0) hash ^= TrailingComments.GetHashCode();
           hash ^= leadingDetachedComments_.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -5673,6 +6502,9 @@ namespace Google.Protobuf.Reflection {
             output.WriteString(TrailingComments);
           }
           leadingDetachedComments_.WriteTo(output, _repeated_leadingDetachedComments_codec);
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5687,6 +6519,9 @@ namespace Google.Protobuf.Reflection {
             size += 1 + pb::CodedOutputStream.ComputeStringSize(TrailingComments);
           }
           size += leadingDetachedComments_.CalculateSize(_repeated_leadingDetachedComments_codec);
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -5704,6 +6539,7 @@ namespace Google.Protobuf.Reflection {
             TrailingComments = other.TrailingComments;
           }
           leadingDetachedComments_.Add(other.leadingDetachedComments_);
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5712,7 +6548,7 @@ namespace Google.Protobuf.Reflection {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 10:
               case 8: {
@@ -5754,12 +6590,13 @@ namespace Google.Protobuf.Reflection {
   /// </summary>
   internal sealed partial class GeneratedCodeInfo : pb::IMessage<GeneratedCodeInfo> {
     private static readonly pb::MessageParser<GeneratedCodeInfo> _parser = new pb::MessageParser<GeneratedCodeInfo>(() => new GeneratedCodeInfo());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<GeneratedCodeInfo> Parser { get { return _parser; } }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[19]; }
+      get { return global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor.MessageTypes[20]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5777,6 +6614,7 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public GeneratedCodeInfo(GeneratedCodeInfo other) : this() {
       annotation_ = other.annotation_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5812,13 +6650,16 @@ namespace Google.Protobuf.Reflection {
         return true;
       }
       if(!annotation_.Equals(other.annotation_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= annotation_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -5830,12 +6671,18 @@ namespace Google.Protobuf.Reflection {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       annotation_.WriteTo(output, _repeated_annotation_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += annotation_.CalculateSize(_repeated_annotation_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -5845,6 +6692,7 @@ namespace Google.Protobuf.Reflection {
         return;
       }
       annotation_.Add(other.annotation_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5853,7 +6701,7 @@ namespace Google.Protobuf.Reflection {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             annotation_.AddEntriesFrom(input, _repeated_annotation_codec);
@@ -5869,6 +6717,7 @@ namespace Google.Protobuf.Reflection {
     public static partial class Types {
       internal sealed partial class Annotation : pb::IMessage<Annotation> {
         private static readonly pb::MessageParser<Annotation> _parser = new pb::MessageParser<Annotation>(() => new Annotation());
+        private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pb::MessageParser<Annotation> Parser { get { return _parser; } }
 
@@ -5895,6 +6744,7 @@ namespace Google.Protobuf.Reflection {
           sourceFile_ = other.sourceFile_;
           begin_ = other.begin_;
           end_ = other.end_;
+          _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5978,7 +6828,7 @@ namespace Google.Protobuf.Reflection {
           if (SourceFile != other.SourceFile) return false;
           if (Begin != other.Begin) return false;
           if (End != other.End) return false;
-          return true;
+          return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5988,6 +6838,9 @@ namespace Google.Protobuf.Reflection {
           if (SourceFile.Length != 0) hash ^= SourceFile.GetHashCode();
           if (Begin != 0) hash ^= Begin.GetHashCode();
           if (End != 0) hash ^= End.GetHashCode();
+          if (_unknownFields != null) {
+            hash ^= _unknownFields.GetHashCode();
+          }
           return hash;
         }
 
@@ -6011,6 +6864,9 @@ namespace Google.Protobuf.Reflection {
             output.WriteRawTag(32);
             output.WriteInt32(End);
           }
+          if (_unknownFields != null) {
+            _unknownFields.WriteTo(output);
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6026,6 +6882,9 @@ namespace Google.Protobuf.Reflection {
           if (End != 0) {
             size += 1 + pb::CodedOutputStream.ComputeInt32Size(End);
           }
+          if (_unknownFields != null) {
+            size += _unknownFields.CalculateSize();
+          }
           return size;
         }
 
@@ -6044,6 +6903,7 @@ namespace Google.Protobuf.Reflection {
           if (other.End != 0) {
             End = other.End;
           }
+          _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -6052,7 +6912,7 @@ namespace Google.Protobuf.Reflection {
           while ((tag = input.ReadTag()) != 0) {
             switch(tag) {
               default:
-                input.SkipLastField();
+                _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 10:
               case 8: {
diff --git a/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
index 9124beee..be94cb10 100644
--- a/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/FileDescriptor.cs
@@ -30,6 +30,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
+using Google.Protobuf.WellKnownTypes;
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -43,6 +44,16 @@ namespace Google.Protobuf.Reflection
     /// </summary>
     public sealed class FileDescriptor : IDescriptor
     {
+        // Prevent linker failures when using IL2CPP with the well-known types.
+        static FileDescriptor()
+        {
+            ForceReflectionInitialization<Syntax>();
+            ForceReflectionInitialization<NullValue>();
+            ForceReflectionInitialization<Field.Types.Cardinality>();
+            ForceReflectionInitialization<Field.Types.Kind>();
+            ForceReflectionInitialization<Value.KindOneofCase>();
+        }
+
         private FileDescriptor(ByteString descriptorData, FileDescriptorProto proto, FileDescriptor[] dependencies, DescriptorPool pool, bool allowUnknownDependencies, GeneratedClrTypeInfo generatedCodeInfo)
         {
             SerializedData = descriptorData;
@@ -334,5 +345,18 @@ namespace Google.Protobuf.Reflection
         /// The (possibly empty) set of custom options for this file.
         /// </summary>
         public CustomOptions CustomOptions => Proto.Options?.CustomOptions ?? CustomOptions.Empty;
+
+        /// <summary>
+        /// Performs initialization for the given generic type argument.
+        /// </summary>
+        /// <remarks>
+        /// This method is present for the sake of AOT compilers. It allows code (whether handwritten or generated)
+        /// to make calls into the reflection machinery of this library to express an intention to use that type
+        /// reflectively (e.g. for JSON parsing and formatting). The call itself does almost nothing, but AOT compilers
+        /// attempting to determine which generic type arguments need to be handled will spot the code path and act
+        /// accordingly.
+        /// </remarks>
+        /// <typeparam name="T">The type to force initialization for.</typeparam>
+        public static void ForceReflectionInitialization<T>() => ReflectionUtil.ForceInitialize<T>();
     }
 }
diff --git a/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs b/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs
index 8714ab18..97596218 100644
--- a/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs
@@ -52,7 +52,7 @@ namespace Google.Protobuf.Reflection
                 throw new ArgumentException("Cannot read from property");
             }
             this.descriptor = descriptor;
-            caseDelegate = ReflectionUtil.CreateFuncIMessageT<int>(caseProperty.GetGetMethod());
+            caseDelegate = ReflectionUtil.CreateFuncIMessageInt32(caseProperty.GetGetMethod());
 
             this.descriptor = descriptor;
             clearDelegate = ReflectionUtil.CreateActionIMessage(clearMethod);
diff --git a/csharp/src/Google.Protobuf/Reflection/ReflectionUtil.cs b/csharp/src/Google.Protobuf/Reflection/ReflectionUtil.cs
index df820ca3..18a70b80 100644
--- a/csharp/src/Google.Protobuf/Reflection/ReflectionUtil.cs
+++ b/csharp/src/Google.Protobuf/Reflection/ReflectionUtil.cs
@@ -30,11 +30,14 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
+using Google.Protobuf.Compatibility;
 using System;
-using System.Collections.Generic;
-using System.Linq.Expressions;
 using System.Reflection;
 
+#if NET35
+using Google.Protobuf.Compatibility;
+#endif
+
 namespace Google.Protobuf.Reflection
 {
     /// <summary>
@@ -47,61 +50,160 @@ namespace Google.Protobuf.Reflection
     /// </summary>
     internal static class ReflectionUtil
     {
+        static ReflectionUtil()
+        {
+            ForceInitialize<string>(); // Handles all reference types
+            ForceInitialize<int>();
+            ForceInitialize<long>();
+            ForceInitialize<uint>();
+            ForceInitialize<ulong>();
+            ForceInitialize<float>();
+            ForceInitialize<double>();
+            ForceInitialize<bool>();
+            ForceInitialize<int?>();
+            ForceInitialize<long?>();
+            ForceInitialize<uint?>();
+            ForceInitialize<ulong?>();
+            ForceInitialize<float?>();
+            ForceInitialize<double?>();
+            ForceInitialize<bool?>();
+            ForceInitialize<SampleEnum>();
+            SampleEnumMethod();
+        }
+
+        internal static void ForceInitialize<T>() => new ReflectionHelper<IMessage, T>();
+
         /// <summary>
         /// Empty Type[] used when calling GetProperty to force property instead of indexer fetching.
         /// </summary>
         internal static readonly Type[] EmptyTypes = new Type[0];
 
         /// <summary>
-        /// Creates a delegate which will cast the argument to the appropriate method target type,
+        /// Creates a delegate which will cast the argument to the type that declares the method,
         /// call the method on it, then convert the result to object.
         /// </summary>
-        internal static Func<IMessage, object> CreateFuncIMessageObject(MethodInfo method)
-        {
-            ParameterExpression parameter = Expression.Parameter(typeof(IMessage), "p");
-            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
-            Expression call = Expression.Call(downcast, method);
-            Expression upcast = Expression.Convert(call, typeof(object));
-            return Expression.Lambda<Func<IMessage, object>>(upcast, parameter).Compile();
-        }
+        /// <param name="method">The method to create a delegate for, which must be declared in an IMessage
+        /// implementation.</param>
+        internal static Func<IMessage, object> CreateFuncIMessageObject(MethodInfo method) =>
+            GetReflectionHelper(method.DeclaringType, method.ReturnType).CreateFuncIMessageObject(method);
 
         /// <summary>
-        /// Creates a delegate which will cast the argument to the appropriate method target type,
-        /// call the method on it, then convert the result to the specified type.
+        /// Creates a delegate which will cast the argument to the type that declares the method,
+        /// call the method on it, then convert the result to the specified type. The method is expected
+        /// to actually return an enum (because of where we're calling it - for oneof cases). Sometimes that
+        /// means we need some extra work to perform conversions.
         /// </summary>
-        internal static Func<IMessage, T> CreateFuncIMessageT<T>(MethodInfo method)
-        {
-            ParameterExpression parameter = Expression.Parameter(typeof(IMessage), "p");
-            Expression downcast = Expression.Convert(parameter, method.DeclaringType);
-            Expression call = Expression.Call(downcast, method);
-            Expression upcast = Expression.Convert(call, typeof(T));
-            return Expression.Lambda<Func<IMessage, T>>(upcast, parameter).Compile();
-        }
+        /// <param name="method">The method to create a delegate for, which must be declared in an IMessage
+        /// implementation.</param>
+        internal static Func<IMessage, int> CreateFuncIMessageInt32(MethodInfo method) =>
+            GetReflectionHelper(method.DeclaringType, method.ReturnType).CreateFuncIMessageInt32(method);
 
         /// <summary>
         /// Creates a delegate which will execute the given method after casting the first argument to
-        /// the target type of the method, and the second argument to the first parameter type of the method.
+        /// the type that declares the method, and the second argument to the first parameter type of the method.
         /// </summary>
-        internal static Action<IMessage, object> CreateActionIMessageObject(MethodInfo method)
-        {
-            ParameterExpression targetParameter = Expression.Parameter(typeof(IMessage), "target");
-            ParameterExpression argParameter = Expression.Parameter(typeof(object), "arg");
-            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
-            Expression castArgument = Expression.Convert(argParameter, method.GetParameters()[0].ParameterType);
-            Expression call = Expression.Call(castTarget, method, castArgument);
-            return Expression.Lambda<Action<IMessage, object>>(call, targetParameter, argParameter).Compile();
-        }
+        /// <param name="method">The method to create a delegate for, which must be declared in an IMessage
+        /// implementation.</param>
+        internal static Action<IMessage, object> CreateActionIMessageObject(MethodInfo method) =>
+            GetReflectionHelper(method.DeclaringType, method.GetParameters()[0].ParameterType).CreateActionIMessageObject(method);
 
         /// <summary>
         /// Creates a delegate which will execute the given method after casting the first argument to
-        /// the target type of the method.
+        /// type that declares the method.
+        /// </summary>
+        /// <param name="method">The method to create a delegate for, which must be declared in an IMessage
+        /// implementation.</param>
+        internal static Action<IMessage> CreateActionIMessage(MethodInfo method) =>
+            GetReflectionHelper(method.DeclaringType, typeof(object)).CreateActionIMessage(method);
+
+        /// <summary>
+        /// Creates a reflection helper for the given type arguments. Currently these are created on demand
+        /// rather than cached; this will be "busy" when initially loading a message's descriptor, but after that
+        /// they can be garbage collected. We could cache them by type if that proves to be important, but creating
+        /// an object is pretty cheap.
         /// </summary>
-        internal static Action<IMessage> CreateActionIMessage(MethodInfo method)
+        private static IReflectionHelper GetReflectionHelper(Type t1, Type t2) =>
+            (IReflectionHelper) Activator.CreateInstance(typeof(ReflectionHelper<,>).MakeGenericType(t1, t2));
+
+        // Non-generic interface allowing us to use an instance of ReflectionHelper<T1, T2> without statically
+        // knowing the types involved.
+        private interface IReflectionHelper
+        {
+            Func<IMessage, int> CreateFuncIMessageInt32(MethodInfo method);
+            Action<IMessage> CreateActionIMessage(MethodInfo method);
+            Func<IMessage, object> CreateFuncIMessageObject(MethodInfo method);
+            Action<IMessage, object> CreateActionIMessageObject(MethodInfo method);
+        }
+
+        private class ReflectionHelper<T1, T2> : IReflectionHelper
+        {
+
+            public Func<IMessage, int> CreateFuncIMessageInt32(MethodInfo method)
+            {
+                // On pleasant runtimes, we can create a Func<int> from a method returning
+                // an enum based on an int. That's the fast path.
+                if (CanConvertEnumFuncToInt32Func)
+                {
+                    var del = (Func<T1, int>) method.CreateDelegate(typeof(Func<T1, int>));
+                    return message => del((T1) message);
+                }
+                else
+                {
+                    // On some runtimes (e.g. old Mono) the return type has to be exactly correct,
+                    // so we go via boxing. Reflection is already fairly inefficient, and this is
+                    // only used for one-of case checking, fortunately.
+                    var del = (Func<T1, T2>) method.CreateDelegate(typeof(Func<T1, T2>));
+                    return message => (int) (object) del((T1) message);
+                }
+            }
+
+            public Action<IMessage> CreateActionIMessage(MethodInfo method)
+            {
+                var del = (Action<T1>) method.CreateDelegate(typeof(Action<T1>));
+                return message => del((T1) message);
+            }
+
+            public Func<IMessage, object> CreateFuncIMessageObject(MethodInfo method)
+            {
+                var del = (Func<T1, T2>) method.CreateDelegate(typeof(Func<T1, T2>));
+                return message => del((T1) message);
+            }
+
+            public Action<IMessage, object> CreateActionIMessageObject(MethodInfo method)
+            {
+                var del = (Action<T1, T2>) method.CreateDelegate(typeof(Action<T1, T2>));
+                return (message, arg) => del((T1) message, (T2) arg);
+            }
+        }
+
+        // Runtime compatibility checking code - see ReflectionHelper<T1, T2>.CreateFuncIMessageInt32 for
+        // details about why we're doing this.
+
+        // Deliberately not inside the generic type. We only want to check this once.
+        private static bool CanConvertEnumFuncToInt32Func { get; } = CheckCanConvertEnumFuncToInt32Func();
+
+        private static bool CheckCanConvertEnumFuncToInt32Func()
+        {
+            try
+            {
+                // Try to do the conversion using reflection, so we can see whether it's supported.
+                MethodInfo method = typeof(ReflectionUtil).GetMethod(nameof(SampleEnumMethod));
+                // If this passes, we're in a reasonable runtime.
+                method.CreateDelegate(typeof(Func<int>));
+                return true;
+            }
+            catch (ArgumentException)
+            {
+                return false;
+            }
+        }
+
+        public enum SampleEnum
         {
-            ParameterExpression targetParameter = Expression.Parameter(typeof(IMessage), "target");
-            Expression castTarget = Expression.Convert(targetParameter, method.DeclaringType);
-            Expression call = Expression.Call(castTarget, method);
-            return Expression.Lambda<Action<IMessage>>(call, targetParameter).Compile();
-        }        
+            X
+        }
+
+        // Public to make the reflection simpler.
+        public static SampleEnum SampleEnumMethod() => SampleEnum.X;
     }
-}
\ No newline at end of file
+}
diff --git a/csharp/src/Google.Protobuf/UnknownField.cs b/csharp/src/Google.Protobuf/UnknownField.cs
new file mode 100644
index 00000000..0d6eed63
--- /dev/null
+++ b/csharp/src/Google.Protobuf/UnknownField.cs
@@ -0,0 +1,263 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Google.Protobuf.Collections;
+
+namespace Google.Protobuf
+{
+    /// <summary>
+    /// Represents a single field in an UnknownFieldSet.
+    ///
+    /// An UnknownField consists of four lists of values. The lists correspond
+    /// to the four "wire types" used in the protocol buffer binary format.
+    /// Normally, only one of the four lists will contain any values, since it
+    /// is impossible to define a valid message type that declares two different
+    /// types for the same field number. However, the code is designed to allow
+    /// for the case where the same unknown field number is encountered using
+    /// multiple different wire types.
+    ///
+    /// </summary>
+    internal sealed class UnknownField
+    {
+        private List<ulong> varintList;
+        private List<uint> fixed32List;
+        private List<ulong> fixed64List;
+        private List<ByteString> lengthDelimitedList;
+
+        /// <summary>
+        /// Creates a new UnknownField.
+        /// </summary>
+        public UnknownField()
+        {
+        }
+
+        /// <summary>
+        /// Checks if two unknown field are equal.
+        /// </summary>
+        public override bool Equals(object other)
+        {
+            if (ReferenceEquals(this, other))
+            {
+                return true;
+            }
+            UnknownField otherField = other as UnknownField;
+            return otherField != null
+                   && Lists.Equals(varintList, otherField.varintList)
+                   && Lists.Equals(fixed32List, otherField.fixed32List)
+                   && Lists.Equals(fixed64List, otherField.fixed64List)
+                   && Lists.Equals(lengthDelimitedList, otherField.lengthDelimitedList);
+        }
+
+        /// <summary>
+        /// Get the hash code of the unknown field.
+        /// </summary>
+        public override int GetHashCode()
+        {
+            int hash = 43;
+            hash = hash * 47 + Lists.GetHashCode(varintList);
+            hash = hash * 47 + Lists.GetHashCode(fixed32List);
+            hash = hash * 47 + Lists.GetHashCode(fixed64List);
+            hash = hash * 47 + Lists.GetHashCode(lengthDelimitedList);
+            return hash;
+        }
+
+        /// <summary>
+        /// Serializes the field, including the field number, and writes it to
+        /// <paramref name="output"/>
+        /// </summary>
+        /// <param name="fieldNumber">The unknown field number.</param>
+        /// <param name="output">The CodedOutputStream to write to.</param>
+        internal void WriteTo(int fieldNumber, CodedOutputStream output)
+        {
+            if (varintList != null)
+            {
+                foreach (ulong value in varintList)
+                {
+                    output.WriteTag(fieldNumber, WireFormat.WireType.Varint);
+                    output.WriteUInt64(value);
+                }
+            }
+            if (fixed32List != null)
+            {
+                foreach (uint value in fixed32List)
+                {
+                    output.WriteTag(fieldNumber, WireFormat.WireType.Fixed32);
+                    output.WriteFixed32(value);
+                }
+            }
+            if (fixed64List != null)
+            {
+                foreach (ulong value in fixed64List)
+                {
+                    output.WriteTag(fieldNumber, WireFormat.WireType.Fixed64);
+                    output.WriteFixed64(value);
+                }
+            }
+            if (lengthDelimitedList != null)
+            {
+                foreach (ByteString value in lengthDelimitedList)
+                {
+                    output.WriteTag(fieldNumber, WireFormat.WireType.LengthDelimited);
+                    output.WriteBytes(value);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Computes the number of bytes required to encode this field, including field
+        /// number.
+        /// </summary>
+        internal int GetSerializedSize(int fieldNumber)
+        {
+            int result = 0;
+            if (varintList != null)
+            {
+                result += CodedOutputStream.ComputeTagSize(fieldNumber) * varintList.Count;
+                foreach (ulong value in varintList)
+                {
+                    result += CodedOutputStream.ComputeUInt64Size(value);
+                }
+            }
+            if (fixed32List != null)
+            {
+                result += CodedOutputStream.ComputeTagSize(fieldNumber) * fixed32List.Count;
+                result += CodedOutputStream.ComputeFixed32Size(1) * fixed32List.Count;
+            }
+            if (fixed64List != null)
+            {
+                result += CodedOutputStream.ComputeTagSize(fieldNumber) * fixed64List.Count;
+                result += CodedOutputStream.ComputeFixed64Size(1) * fixed64List.Count;
+            }                
+            if (lengthDelimitedList != null)
+            {
+                result += CodedOutputStream.ComputeTagSize(fieldNumber) * lengthDelimitedList.Count;
+                foreach (ByteString value in lengthDelimitedList)
+                {
+                    result += CodedOutputStream.ComputeBytesSize(value);
+                }
+            }
+            return result;
+        }
+
+        /// <summary>
+        /// Merge the values in <paramref name="other" /> into this field.  For each list
+        /// of values, <paramref name="other"/>'s values are append to the ones in this
+        /// field.
+        /// </summary>
+        internal UnknownField MergeFrom(UnknownField other)
+        {
+            varintList = AddAll(varintList, other.varintList);
+            fixed32List = AddAll(fixed32List, other.fixed32List);
+            fixed64List = AddAll(fixed64List, other.fixed64List);
+            lengthDelimitedList = AddAll(lengthDelimitedList, other.lengthDelimitedList);
+            return this;
+        }
+
+        /// <summary>
+        /// Returns a new list containing all of the given specified values from
+        /// both the <paramref name="current"/> and <paramref name="extras"/> lists.
+        /// If <paramref name="current" /> is null and <paramref name="extras"/> is empty,
+        /// null is returned. Otherwise, either a new list is created (if <paramref name="current" />
+        /// is null) or the elements of <paramref name="extras"/> are added to <paramref name="current" />.
+        /// </summary>
+        private static List<T> AddAll<T>(List<T> current, IList<T> extras)
+        {
+            if (extras.Count == 0)
+            {
+                return current;
+            }
+            if (current == null)
+            {
+                current = new List<T>(extras);
+            }
+            else
+            {
+                current.AddRange(extras);
+            }
+            return current;
+        }
+
+        /// <summary>
+        /// Adds a varint value.
+        /// </summary>
+        internal UnknownField AddVarint(ulong value)
+        {
+            varintList = Add(varintList, value);
+            return this;
+        }
+
+        /// <summary>
+        /// Adds a fixed32 value.
+        /// </summary>
+        internal UnknownField AddFixed32(uint value)
+        {
+            fixed32List = Add(fixed32List, value);
+            return this;
+        }
+
+        /// <summary>
+        /// Adds a fixed64 value.
+        /// </summary>
+        internal UnknownField AddFixed64(ulong value)
+        {
+            fixed64List = Add(fixed64List, value);
+            return this;
+        }
+
+        /// <summary>
+        /// Adds a length-delimited value.
+        /// </summary>
+        internal UnknownField AddLengthDelimited(ByteString value)
+        {
+            lengthDelimitedList = Add(lengthDelimitedList, value);
+            return this;
+        }
+
+        /// <summary>
+        /// Adds <paramref name="value"/> to the <paramref name="list"/>, creating
+        /// a new list if <paramref name="list"/> is null. The list is returned - either
+        /// the original reference or the new list.
+        /// </summary>
+        private static List<T> Add<T>(List<T> list, T value)
+        {
+            if (list == null)
+            {
+                list = new List<T>();
+            }
+            list.Add(value);
+            return list;
+        }
+    }
+}
diff --git a/csharp/src/Google.Protobuf/UnknownFieldSet.cs b/csharp/src/Google.Protobuf/UnknownFieldSet.cs
new file mode 100644
index 00000000..6404c3c0
--- /dev/null
+++ b/csharp/src/Google.Protobuf/UnknownFieldSet.cs
@@ -0,0 +1,330 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Google.Protobuf.Reflection;
+
+namespace Google.Protobuf
+{
+    /// <summary>
+    /// Used to keep track of fields which were seen when parsing a protocol message
+    /// but whose field numbers or types are unrecognized. This most frequently
+    /// occurs when new fields are added to a message type and then messages containing
+    /// those fields are read by old software that was built before the new types were
+    /// added.
+    ///
+    /// Most users will never need to use this class directly.
+    /// </summary>
+    public sealed partial class UnknownFieldSet
+    {
+        private readonly IDictionary<int, UnknownField> fields;
+
+        /// <summary>
+        /// Creates a new UnknownFieldSet.
+        /// </summary>
+        internal UnknownFieldSet()
+        {
+            this.fields = new Dictionary<int, UnknownField>();
+        }
+
+        /// <summary>
+        /// Checks whether or not the given field number is present in the set.
+        /// </summary>
+        internal bool HasField(int field)
+        {
+            return fields.ContainsKey(field);
+        }
+
+        /// <summary>
+        /// Serializes the set and writes it to <paramref name="output"/>.
+        /// </summary>
+        public void WriteTo(CodedOutputStream output)
+        {
+            foreach (KeyValuePair<int, UnknownField> entry in fields)
+            {
+                entry.Value.WriteTo(entry.Key, output);
+            }
+        }
+
+        /// <summary>
+        /// Gets the number of bytes required to encode this set.
+        /// </summary>
+        public int CalculateSize()
+        {
+            int result = 0;
+            foreach (KeyValuePair<int, UnknownField> entry in fields)
+            {
+                result += entry.Value.GetSerializedSize(entry.Key);
+            }
+            return result;
+        }
+
+        /// <summary>
+        /// Checks if two unknown field sets are equal.
+        /// </summary>
+        public override bool Equals(object other)
+        {
+            if (ReferenceEquals(this, other))
+            {
+                return true;
+            }
+            UnknownFieldSet otherSet = other as UnknownFieldSet;
+            IDictionary<int, UnknownField> otherFields = otherSet.fields;
+            if (fields.Count  != otherFields.Count)
+            {
+                return false;
+            }
+            foreach (KeyValuePair<int, UnknownField> leftEntry in fields)
+            {
+                UnknownField rightValue;
+                if (!otherFields.TryGetValue(leftEntry.Key, out rightValue))
+                {
+                    return false;
+                }
+                if (!leftEntry.Value.Equals(rightValue))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        /// <summary>
+        /// Gets the unknown field set's hash code.
+        /// </summary>
+        public override int GetHashCode()
+        {
+            int ret = 1;
+            foreach (KeyValuePair<int, UnknownField> field in fields)
+            {
+                // Use ^ here to make the field order irrelevant.
+                int hash = field.Key.GetHashCode() ^ field.Value.GetHashCode();
+                ret ^= hash;
+            }
+            return ret;
+        }
+
+        // Optimization:  We keep around the last field that was
+        // modified so that we can efficiently add to it multiple times in a
+        // row (important when parsing an unknown repeated field).
+        private int lastFieldNumber;
+        private UnknownField lastField;
+
+        private UnknownField GetOrAddField(int number)
+        {
+            if (lastField != null && number == lastFieldNumber)
+            {
+                return lastField;
+            }
+            if (number == 0)
+            {
+                return null;
+            }
+
+            UnknownField existing;
+            if (fields.TryGetValue(number, out existing))
+            {
+                return existing;
+            }
+            lastField = new UnknownField();
+            AddOrReplaceField(number, lastField);
+            lastFieldNumber = number;
+            return lastField;
+        }
+
+        /// <summary>
+        /// Adds a field to the set. If a field with the same number already exists, it
+        /// is replaced.
+        /// </summary>
+        internal UnknownFieldSet AddOrReplaceField(int number, UnknownField field)
+        {
+            if (number == 0)
+            {
+                throw new ArgumentOutOfRangeException("number", "Zero is not a valid field number.");
+            }
+            fields[number] = field;
+            return this;
+        }
+
+        /// <summary>
+        /// Parse a single field from <paramref name="input"/> and merge it
+        /// into this set.
+        /// </summary>
+        /// <param name="input">The coded input stream containing the field</param>
+        /// <returns>false if the tag is an "end group" tag, true otherwise</returns>
+        private void MergeFieldFrom(CodedInputStream input)
+        {
+            uint tag = input.LastTag;
+            int number = WireFormat.GetTagFieldNumber(tag);
+            switch (WireFormat.GetTagWireType(tag))
+            {
+                case WireFormat.WireType.Varint:
+                    {
+                        ulong uint64 = input.ReadUInt64();
+                        GetOrAddField(number).AddVarint(uint64);
+                        return;
+                    }
+                case WireFormat.WireType.Fixed32:
+                    {
+                        uint uint32 = input.ReadFixed32();
+                        GetOrAddField(number).AddFixed32(uint32);
+                        return;
+                    }
+                case WireFormat.WireType.Fixed64:
+                    {
+                        ulong uint64 = input.ReadFixed64();
+                        GetOrAddField(number).AddFixed64(uint64);
+                        return;
+                    }
+                case WireFormat.WireType.LengthDelimited:
+                    {
+                        ByteString bytes = input.ReadBytes();
+                        GetOrAddField(number).AddLengthDelimited(bytes);
+                        return;
+                    }
+                case WireFormat.WireType.StartGroup:
+                    {
+                        input.SkipGroup(tag);
+                        return;
+                    }
+                case WireFormat.WireType.EndGroup:
+                    {
+                        throw new InvalidProtocolBufferException("Merge an unknown field of end-group tag, indicating that the corresponding start-group was missing.");
+                    }
+                default:
+                    throw new InvalidOperationException("Wire Type is invalid.");
+            }
+        }
+
+        /// <summary>
+        /// Create a new UnknownFieldSet if unknownFields is null.
+        /// Parse a single field from <paramref name="input"/> and merge it
+        /// into unknownFields. If <paramref name="input"/> is configured to discard unknown fields,
+        /// <paramref name="unknownFields"/> will be returned as-is and the field will be skipped.
+        /// </summary>
+        /// <param name="unknownFields">The UnknownFieldSet which need to be merged</param>
+        /// <param name="input">The coded input stream containing the field</param>
+        /// <returns>The merged UnknownFieldSet</returns>
+        public static UnknownFieldSet MergeFieldFrom(UnknownFieldSet unknownFields,
+                                                     CodedInputStream input)
+        {
+            if (input.DiscardUnknownFields)
+            {
+                input.SkipLastField();
+                return unknownFields;
+            }
+            if (unknownFields == null)
+            {
+                unknownFields = new UnknownFieldSet();
+            }
+            unknownFields.MergeFieldFrom(input);
+            return unknownFields;
+        }
+
+        /// <summary>
+        /// Merges the fields from <paramref name="other"/> into this set.
+        /// If a field number exists in both sets, the values in <paramref name="other"/>
+        /// will be appended to the values in this set.
+        /// </summary>
+        private UnknownFieldSet MergeFrom(UnknownFieldSet other)
+        {
+            if (other != null)
+            {
+                foreach (KeyValuePair<int, UnknownField> entry in other.fields)
+                {
+                    MergeField(entry.Key, entry.Value);
+                }
+            }
+            return this;
+        }
+
+        /// <summary>
+        /// Created a new UnknownFieldSet to <paramref name="unknownFields"/> if
+        /// needed and merges the fields from <paramref name="other"/> into the first set.
+        /// If a field number exists in both sets, the values in <paramref name="other"/>
+        /// will be appended to the values in this set.
+        /// </summary>
+        public static UnknownFieldSet MergeFrom(UnknownFieldSet unknownFields,
+                                                UnknownFieldSet other)
+        {
+            if (other == null)
+            {
+                return unknownFields;
+            }
+            if (unknownFields == null)
+            {
+                unknownFields = new UnknownFieldSet();
+            }
+            unknownFields.MergeFrom(other);
+            return unknownFields;
+        }
+
+
+        /// <summary>
+        /// Adds a field to the unknown field set. If a field with the same
+        /// number already exists, the two are merged.
+        /// </summary>
+        private UnknownFieldSet MergeField(int number, UnknownField field)
+        {
+            if (number == 0)
+            {
+                throw new ArgumentOutOfRangeException("number", "Zero is not a valid field number.");
+            }
+            if (HasField(number))
+            {
+                GetOrAddField(number).MergeFrom(field);
+            }
+            else
+            {
+                AddOrReplaceField(number, field);
+            }
+            return this;
+        }
+
+        /// <summary>
+        /// Clone an unknown field set from <paramref name="other"/>.
+        /// </summary>
+        public static UnknownFieldSet Clone(UnknownFieldSet other)
+        {
+            if (other == null)
+            {
+                return null;
+            }
+            UnknownFieldSet unknownFields = new UnknownFieldSet();
+            unknownFields.MergeFrom(other);
+            return unknownFields;
+        }
+    }
+}
+
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
index b90c9a2a..378b61d4 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/any.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/any.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -73,6 +75,16 @@ namespace Google.Protobuf.WellKnownTypes {
   ///       any.Unpack(foo)
   ///       ...
   ///
+  ///  Example 4: Pack and unpack a message in Go
+  ///
+  ///      foo := &amp;pb.Foo{...}
+  ///      any, err := ptypes.MarshalAny(foo)
+  ///      ...
+  ///      foo := &amp;pb.Foo{}
+  ///      if err := ptypes.UnmarshalAny(any, foo); err != nil {
+  ///        ...
+  ///      }
+  ///
   /// The pack methods provided by protobuf library will by default use
   /// 'type.googleapis.com/full.type.name' as the type URL and the unpack
   /// methods only use the fully qualified type name after the last '/'
@@ -109,6 +121,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Any : pb::IMessage<Any> {
     private static readonly pb::MessageParser<Any> _parser = new pb::MessageParser<Any>(() => new Any());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Any> Parser { get { return _parser; } }
 
@@ -133,6 +146,7 @@ namespace Google.Protobuf.WellKnownTypes {
     public Any(Any other) : this() {
       typeUrl_ = other.typeUrl_;
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -144,17 +158,18 @@ namespace Google.Protobuf.WellKnownTypes {
     public const int TypeUrlFieldNumber = 1;
     private string typeUrl_ = "";
     /// <summary>
-    /// A URL/resource name whose content describes the type of the
-    /// serialized protocol buffer message.
+    /// A URL/resource name that uniquely identifies the type of the serialized
+    /// protocol buffer message. The last segment of the URL's path must represent
+    /// the fully qualified name of the type (as in
+    /// `path/google.protobuf.Duration`). The name should be in a canonical form
+    /// (e.g., leading "." is not accepted).
     ///
-    /// For URLs which use the scheme `http`, `https`, or no scheme, the
-    /// following restrictions and interpretations apply:
+    /// In practice, teams usually precompile into the binary all types that they
+    /// expect it to use in the context of Any. However, for URLs which use the
+    /// scheme `http`, `https`, or no scheme, one can optionally set up a type
+    /// server that maps type URLs to message definitions as follows:
     ///
     /// * If no scheme is provided, `https` is assumed.
-    /// * The last segment of the URL's path must represent the fully
-    ///   qualified name of the type (as in `path/google.protobuf.Duration`).
-    ///   The name should be in a canonical form (e.g., leading "." is
-    ///   not accepted).
     /// * An HTTP GET on the URL must yield a [google.protobuf.Type][]
     ///   value in binary format, or produce an error.
     /// * Applications are allowed to cache lookup results based on the
@@ -163,6 +178,10 @@ namespace Google.Protobuf.WellKnownTypes {
     ///   on changes to types. (Use versioned type names to manage
     ///   breaking changes.)
     ///
+    /// Note: this functionality is not currently available in the official
+    /// protobuf release, and it is not used for type URLs beginning with
+    /// type.googleapis.com.
+    ///
     /// Schemes other than `http`, `https` (or the empty scheme) might be
     /// used with implementation specific semantics.
     /// </summary>
@@ -203,7 +222,7 @@ namespace Google.Protobuf.WellKnownTypes {
       }
       if (TypeUrl != other.TypeUrl) return false;
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -211,6 +230,9 @@ namespace Google.Protobuf.WellKnownTypes {
       int hash = 1;
       if (TypeUrl.Length != 0) hash ^= TypeUrl.GetHashCode();
       if (Value.Length != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -229,6 +251,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(18);
         output.WriteBytes(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -240,6 +265,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeBytesSize(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -254,6 +282,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value.Length != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -262,7 +291,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             TypeUrl = input.ReadString();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/AnyPartial.cs b/csharp/src/Google.Protobuf/WellKnownTypes/AnyPartial.cs
index f4fac738..fca689dc 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/AnyPartial.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/AnyPartial.cs
@@ -44,17 +44,25 @@ namespace Google.Protobuf.WellKnownTypes
             prefix.EndsWith("/") ? prefix + descriptor.FullName : prefix + "/" + descriptor.FullName;
 
         /// <summary>
-        /// Retrieves the type name for a type URL. This is always just the last part of the URL,
-        /// after the trailing slash. No validation of anything before the trailing slash is performed.
-        /// If the type URL does not include a slash, an empty string is returned rather than an exception
-        /// being thrown; this won't match any types, and the calling code is probably in a better position
-        /// to give a meaningful error.
-        /// There is no handling of fragments or queries  at the moment.
+        /// Retrieves the type name for a type URL, matching the <see cref="DescriptorBase.FullName"/>
+        /// of the packed message type.
         /// </summary>
+        /// <remarks>
+        /// <para>
+        /// This is always just the last part of the URL, after the final slash. No validation of 
+        /// anything before the trailing slash is performed. If the type URL does not include a slash,
+        /// an empty string is returned rather than an exception being thrown; this won't match any types,
+        /// and the calling code is probably in a better position to give a meaningful error.
+        /// </para>
+        /// <para>
+        /// There is no handling of fragments or queries  at the moment.
+        /// </para>
+        /// </remarks>
         /// <param name="typeUrl">The URL to extract the type name from</param>
         /// <returns>The type name</returns>
-        internal static string GetTypeName(string typeUrl)
+        public static string GetTypeName(string typeUrl)
         {
+            ProtoPreconditions.CheckNotNull(typeUrl, nameof(typeUrl));
             int lastSlash = typeUrl.LastIndexOf('/');
             return lastSlash == -1 ? "" : typeUrl.Substring(lastSlash + 1);
         }
@@ -81,6 +89,27 @@ namespace Google.Protobuf.WellKnownTypes
         }
 
         /// <summary>
+        /// Attempts to unpack the content of this Any message into the target message type,
+        /// if it matches the type URL within this Any message.
+        /// </summary>
+        /// <typeparam name="T">The type of message to attempt to unpack the content into.</typeparam>
+        /// <returns><c>true</c> if the message was successfully unpacked; <c>false</c> if the type name didn't match</returns>
+        public bool TryUnpack<T>(out T result) where T : IMessage, new()
+        {
+            // Note: deliberately avoid writing anything to result until the end, in case it's being
+            // monitored by other threads. (That would be a bug in the calling code, but let's not make it worse.)
+            T target = new T();
+            if (GetTypeName(TypeUrl) != target.Descriptor.FullName)
+            {
+                result = default(T); // Can't use null as there's no class constraint, but this always *will* be null in real usage.
+                return false;
+            }
+            target.MergeFrom(Value);
+            result = target;
+            return true;
+        }
+
+        /// <summary>
         /// Packs the specified message into an Any message using a type URL prefix of "type.googleapis.com".
         /// </summary>
         /// <param name="message">The message to pack.</param>
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
index aeeb8e73..e4a4a365 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/api.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/api.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -52,10 +54,19 @@ namespace Google.Protobuf.WellKnownTypes {
   }
   #region Messages
   /// <summary>
-  /// Api is a light-weight descriptor for a protocol buffer service.
+  /// Api is a light-weight descriptor for an API Interface.
+  ///
+  /// Interfaces are also described as "protocol buffer services" in some contexts,
+  /// such as by the "service" keyword in a .proto file, but they are different
+  /// from API Services, which represent a concrete implementation of an interface
+  /// as opposed to simply a description of methods and bindings. They are also
+  /// sometimes simply referred to as "APIs" in other contexts, such as the name of
+  /// this message itself. See https://cloud.google.com/apis/design/glossary for
+  /// detailed terminology.
   /// </summary>
   public sealed partial class Api : pb::IMessage<Api> {
     private static readonly pb::MessageParser<Api> _parser = new pb::MessageParser<Api>(() => new Api());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Api> Parser { get { return _parser; } }
 
@@ -82,9 +93,10 @@ namespace Google.Protobuf.WellKnownTypes {
       methods_ = other.methods_.Clone();
       options_ = other.options_.Clone();
       version_ = other.version_;
-      SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      sourceContext_ = other.sourceContext_ != null ? other.sourceContext_.Clone() : null;
       mixins_ = other.mixins_.Clone();
       syntax_ = other.syntax_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -96,8 +108,8 @@ namespace Google.Protobuf.WellKnownTypes {
     public const int NameFieldNumber = 1;
     private string name_ = "";
     /// <summary>
-    /// The fully qualified name of this api, including package name
-    /// followed by the api's simple name.
+    /// The fully qualified name of this interface, including package name
+    /// followed by the interface's simple name.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Name {
@@ -113,7 +125,7 @@ namespace Google.Protobuf.WellKnownTypes {
         = pb::FieldCodec.ForMessage(18, global::Google.Protobuf.WellKnownTypes.Method.Parser);
     private readonly pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Method> methods_ = new pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Method>();
     /// <summary>
-    /// The methods of this api, in unspecified order.
+    /// The methods of this interface, in unspecified order.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Method> Methods {
@@ -126,7 +138,7 @@ namespace Google.Protobuf.WellKnownTypes {
         = pb::FieldCodec.ForMessage(26, global::Google.Protobuf.WellKnownTypes.Option.Parser);
     private readonly pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Option> options_ = new pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Option>();
     /// <summary>
-    /// Any metadata attached to the API.
+    /// Any metadata attached to the interface.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Option> Options {
@@ -137,13 +149,12 @@ namespace Google.Protobuf.WellKnownTypes {
     public const int VersionFieldNumber = 4;
     private string version_ = "";
     /// <summary>
-    /// A version string for this api. If specified, must have the form
-    /// `major-version.minor-version`, as in `1.10`. If the minor version
-    /// is omitted, it defaults to zero. If the entire version field is
-    /// empty, the major version is derived from the package name, as
-    /// outlined below. If the field is not empty, the version in the
-    /// package name will be verified to be consistent with what is
-    /// provided here.
+    /// A version string for this interface. If specified, must have the form
+    /// `major-version.minor-version`, as in `1.10`. If the minor version is
+    /// omitted, it defaults to zero. If the entire version field is empty, the
+    /// major version is derived from the package name, as outlined below. If the
+    /// field is not empty, the version in the package name will be verified to be
+    /// consistent with what is provided here.
     ///
     /// The versioning schema uses [semantic
     /// versioning](http://semver.org) where the major version number
@@ -153,10 +164,10 @@ namespace Google.Protobuf.WellKnownTypes {
     /// chosen based on the product plan.
     ///
     /// The major version is also reflected in the package name of the
-    /// API, which must end in `v&lt;major-version>`, as in
+    /// interface, which must end in `v&lt;major-version>`, as in
     /// `google.feature.v1`. For major versions 0 and 1, the suffix can
     /// be omitted. Zero major versions must only be used for
-    /// experimental, none-GA apis.
+    /// experimental, non-GA interfaces.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Version {
@@ -187,7 +198,7 @@ namespace Google.Protobuf.WellKnownTypes {
         = pb::FieldCodec.ForMessage(50, global::Google.Protobuf.WellKnownTypes.Mixin.Parser);
     private readonly pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin> mixins_ = new pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin>();
     /// <summary>
-    /// Included APIs. See [Mixin][].
+    /// Included interfaces. See [Mixin][].
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin> Mixins {
@@ -228,7 +239,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
       if(!mixins_.Equals(other.mixins_)) return false;
       if (Syntax != other.Syntax) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -241,6 +252,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
       hash ^= mixins_.GetHashCode();
       if (Syntax != 0) hash ^= Syntax.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -270,6 +284,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(56);
         output.WriteEnum((int) Syntax);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -290,6 +307,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Syntax != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -316,6 +336,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Syntax != 0) {
         Syntax = other.Syntax;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -324,7 +345,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -364,10 +385,11 @@ namespace Google.Protobuf.WellKnownTypes {
   }
 
   /// <summary>
-  /// Method represents a method of an api.
+  /// Method represents a method of an API interface.
   /// </summary>
   public sealed partial class Method : pb::IMessage<Method> {
     private static readonly pb::MessageParser<Method> _parser = new pb::MessageParser<Method>(() => new Method());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Method> Parser { get { return _parser; } }
 
@@ -397,6 +419,7 @@ namespace Google.Protobuf.WellKnownTypes {
       responseStreaming_ = other.responseStreaming_;
       options_ = other.options_.Clone();
       syntax_ = other.syntax_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -521,7 +544,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ResponseStreaming != other.ResponseStreaming) return false;
       if(!options_.Equals(other.options_)) return false;
       if (Syntax != other.Syntax) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -534,6 +557,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ResponseStreaming != false) hash ^= ResponseStreaming.GetHashCode();
       hash ^= options_.GetHashCode();
       if (Syntax != 0) hash ^= Syntax.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -569,6 +595,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(56);
         output.WriteEnum((int) Syntax);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -593,6 +622,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Syntax != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -620,6 +652,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Syntax != 0) {
         Syntax = other.Syntax;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -628,7 +661,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -665,9 +698,9 @@ namespace Google.Protobuf.WellKnownTypes {
   }
 
   /// <summary>
-  /// Declares an API to be included in this API. The including API must
-  /// redeclare all the methods from the included API, but documentation
-  /// and options are inherited as follows:
+  /// Declares an API Interface to be included in this interface. The including
+  /// interface must redeclare all the methods from the included interface, but
+  /// documentation and options are inherited as follows:
   ///
   /// - If after comment and whitespace stripping, the documentation
   ///   string of the redeclared method is empty, it will be inherited
@@ -679,7 +712,8 @@ namespace Google.Protobuf.WellKnownTypes {
   ///
   /// - If an http annotation is inherited, the path pattern will be
   ///   modified as follows. Any version prefix will be replaced by the
-  ///   version of the including API plus the [root][] path if specified.
+  ///   version of the including interface plus the [root][] path if
+  ///   specified.
   ///
   /// Example of a simple mixin:
   ///
@@ -745,6 +779,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Mixin : pb::IMessage<Mixin> {
     private static readonly pb::MessageParser<Mixin> _parser = new pb::MessageParser<Mixin>(() => new Mixin());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Mixin> Parser { get { return _parser; } }
 
@@ -769,6 +804,7 @@ namespace Google.Protobuf.WellKnownTypes {
     public Mixin(Mixin other) : this() {
       name_ = other.name_;
       root_ = other.root_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -780,7 +816,7 @@ namespace Google.Protobuf.WellKnownTypes {
     public const int NameFieldNumber = 1;
     private string name_ = "";
     /// <summary>
-    /// The fully qualified name of the API which is included.
+    /// The fully qualified name of the interface which is included.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Name {
@@ -820,7 +856,7 @@ namespace Google.Protobuf.WellKnownTypes {
       }
       if (Name != other.Name) return false;
       if (Root != other.Root) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -828,6 +864,9 @@ namespace Google.Protobuf.WellKnownTypes {
       int hash = 1;
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (Root.Length != 0) hash ^= Root.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -846,6 +885,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(18);
         output.WriteString(Root);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -857,6 +899,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Root.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Root);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -871,6 +916,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Root.Length != 0) {
         Root = other.Root;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -879,7 +925,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
index 03b19c77..2858b532 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/duration.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/duration.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -46,6 +48,8 @@ namespace Google.Protobuf.WellKnownTypes {
   /// two Timestamp values is a Duration and it can be added or subtracted
   /// from a Timestamp. Range is approximately +-10,000 years.
   ///
+  /// # Examples
+  ///
   /// Example 1: Compute Duration from two Timestamps in pseudo code.
   ///
   ///     Timestamp start = ...;
@@ -85,9 +89,20 @@ namespace Google.Protobuf.WellKnownTypes {
   ///     td = datetime.timedelta(days=3, minutes=10)
   ///     duration = Duration()
   ///     duration.FromTimedelta(td)
+  ///
+  /// # JSON Mapping
+  ///
+  /// In JSON format, the Duration type is encoded as a string rather than an
+  /// object, where the string ends in the suffix "s" (indicating seconds) and
+  /// is preceded by the number of seconds, with nanoseconds expressed as
+  /// fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+  /// encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+  /// be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+  /// microsecond should be expressed in JSON format as "3.000001s".
   /// </summary>
   public sealed partial class Duration : pb::IMessage<Duration> {
     private static readonly pb::MessageParser<Duration> _parser = new pb::MessageParser<Duration>(() => new Duration());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Duration> Parser { get { return _parser; } }
 
@@ -112,6 +127,7 @@ namespace Google.Protobuf.WellKnownTypes {
     public Duration(Duration other) : this() {
       seconds_ = other.seconds_;
       nanos_ = other.nanos_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -124,7 +140,8 @@ namespace Google.Protobuf.WellKnownTypes {
     private long seconds_;
     /// <summary>
     /// Signed seconds of the span of time. Must be from -315,576,000,000
-    /// to +315,576,000,000 inclusive.
+    /// to +315,576,000,000 inclusive. Note: these bounds are computed from:
+    /// 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public long Seconds {
@@ -168,7 +185,7 @@ namespace Google.Protobuf.WellKnownTypes {
       }
       if (Seconds != other.Seconds) return false;
       if (Nanos != other.Nanos) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -176,6 +193,9 @@ namespace Google.Protobuf.WellKnownTypes {
       int hash = 1;
       if (Seconds != 0L) hash ^= Seconds.GetHashCode();
       if (Nanos != 0) hash ^= Nanos.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -194,6 +214,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(16);
         output.WriteInt32(Nanos);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -205,6 +228,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Nanos != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Nanos);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -219,6 +245,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Nanos != 0) {
         Nanos = other.Nanos;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -227,7 +254,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Seconds = input.ReadInt64();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
index aa89e08f..2113add9 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/empty.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/empty.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -50,6 +52,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Empty : pb::IMessage<Empty> {
     private static readonly pb::MessageParser<Empty> _parser = new pb::MessageParser<Empty>(() => new Empty());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Empty> Parser { get { return _parser; } }
 
@@ -72,6 +75,7 @@ namespace Google.Protobuf.WellKnownTypes {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Empty(Empty other) : this() {
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -92,12 +96,15 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -108,11 +115,17 @@ namespace Google.Protobuf.WellKnownTypes {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -121,6 +134,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other == null) {
         return;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -129,7 +143,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
         }
       }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
index ef3bc10a..b73930b2 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/field_mask.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/field_mask.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -239,9 +241,16 @@ namespace Google.Protobuf.WellKnownTypes {
   ///
   /// Note that oneof type names ("test_oneof" in this case) cannot be used in
   /// paths.
+  ///
+  /// ## Field Mask Verification
+  ///
+  /// The implementation of any API method which has a FieldMask type field in the
+  /// request should verify the included field paths, and return an
+  /// `INVALID_ARGUMENT` error if any path is duplicated or unmappable.
   /// </summary>
   public sealed partial class FieldMask : pb::IMessage<FieldMask> {
     private static readonly pb::MessageParser<FieldMask> _parser = new pb::MessageParser<FieldMask>(() => new FieldMask());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FieldMask> Parser { get { return _parser; } }
 
@@ -265,6 +274,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FieldMask(FieldMask other) : this() {
       paths_ = other.paths_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -299,13 +309,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if(!paths_.Equals(other.paths_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= paths_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -317,12 +330,18 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       paths_.WriteTo(output, _repeated_paths_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += paths_.CalculateSize(_repeated_paths_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -332,6 +351,7 @@ namespace Google.Protobuf.WellKnownTypes {
         return;
       }
       paths_.Add(other.paths_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -340,7 +360,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             paths_.AddEntriesFrom(input, _repeated_paths_codec);
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
index 6ddadf19..124ddaa7 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/source_context.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/source_context.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -44,6 +46,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class SourceContext : pb::IMessage<SourceContext> {
     private static readonly pb::MessageParser<SourceContext> _parser = new pb::MessageParser<SourceContext>(() => new SourceContext());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<SourceContext> Parser { get { return _parser; } }
 
@@ -67,6 +70,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public SourceContext(SourceContext other) : this() {
       fileName_ = other.fileName_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -103,13 +107,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (FileName != other.FileName) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (FileName.Length != 0) hash ^= FileName.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -124,6 +131,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(10);
         output.WriteString(FileName);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -132,6 +142,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (FileName.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(FileName);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -143,6 +156,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.FileName.Length != 0) {
         FileName = other.FileName;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -151,7 +165,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             FileName = input.ReadString();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
index 1fa35521..194b81e9 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/struct.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/struct.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -77,6 +79,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Struct : pb::IMessage<Struct> {
     private static readonly pb::MessageParser<Struct> _parser = new pb::MessageParser<Struct>(() => new Struct());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Struct> Parser { get { return _parser; } }
 
@@ -100,6 +103,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Struct(Struct other) : this() {
       fields_ = other.fields_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -134,13 +138,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (!Fields.Equals(other.Fields)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= Fields.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -152,12 +159,18 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       fields_.WriteTo(output, _map_fields_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += fields_.CalculateSize(_map_fields_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -167,6 +180,7 @@ namespace Google.Protobuf.WellKnownTypes {
         return;
       }
       fields_.Add(other.fields_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -175,7 +189,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             fields_.AddEntriesFrom(input, _map_fields_codec);
@@ -197,6 +211,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Value : pb::IMessage<Value> {
     private static readonly pb::MessageParser<Value> _parser = new pb::MessageParser<Value>(() => new Value());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Value> Parser { get { return _parser; } }
 
@@ -240,6 +255,7 @@ namespace Google.Protobuf.WellKnownTypes {
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -368,25 +384,28 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (NullValue != other.NullValue) return false;
-      if (NumberValue != other.NumberValue) return false;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(NumberValue, other.NumberValue)) return false;
       if (StringValue != other.StringValue) return false;
       if (BoolValue != other.BoolValue) return false;
       if (!object.Equals(StructValue, other.StructValue)) return false;
       if (!object.Equals(ListValue, other.ListValue)) return false;
       if (KindCase != other.KindCase) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (kindCase_ == KindOneofCase.NullValue) hash ^= NullValue.GetHashCode();
-      if (kindCase_ == KindOneofCase.NumberValue) hash ^= NumberValue.GetHashCode();
+      if (kindCase_ == KindOneofCase.NumberValue) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(NumberValue);
       if (kindCase_ == KindOneofCase.StringValue) hash ^= StringValue.GetHashCode();
       if (kindCase_ == KindOneofCase.BoolValue) hash ^= BoolValue.GetHashCode();
       if (kindCase_ == KindOneofCase.StructValue) hash ^= StructValue.GetHashCode();
       if (kindCase_ == KindOneofCase.ListValue) hash ^= ListValue.GetHashCode();
       hash ^= (int) kindCase_;
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -421,6 +440,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(50);
         output.WriteMessage(ListValue);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -444,6 +466,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (kindCase_ == KindOneofCase.ListValue) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(ListValue);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -466,13 +491,20 @@ namespace Google.Protobuf.WellKnownTypes {
           BoolValue = other.BoolValue;
           break;
         case KindOneofCase.StructValue:
-          StructValue = other.StructValue;
+          if (StructValue == null) {
+            StructValue = new global::Google.Protobuf.WellKnownTypes.Struct();
+          }
+          StructValue.MergeFrom(other.StructValue);
           break;
         case KindOneofCase.ListValue:
-          ListValue = other.ListValue;
+          if (ListValue == null) {
+            ListValue = new global::Google.Protobuf.WellKnownTypes.ListValue();
+          }
+          ListValue.MergeFrom(other.ListValue);
           break;
       }
 
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -481,7 +513,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             kind_ = input.ReadEnum();
@@ -531,6 +563,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class ListValue : pb::IMessage<ListValue> {
     private static readonly pb::MessageParser<ListValue> _parser = new pb::MessageParser<ListValue>(() => new ListValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<ListValue> Parser { get { return _parser; } }
 
@@ -554,6 +587,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ListValue(ListValue other) : this() {
       values_ = other.values_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -588,13 +622,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if(!values_.Equals(other.values_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       hash ^= values_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -606,12 +643,18 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public void WriteTo(pb::CodedOutputStream output) {
       values_.WriteTo(output, _repeated_values_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CalculateSize() {
       int size = 0;
       size += values_.CalculateSize(_repeated_values_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -621,6 +664,7 @@ namespace Google.Protobuf.WellKnownTypes {
         return;
       }
       values_.Add(other.values_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -629,7 +673,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             values_.AddEntriesFrom(input, _repeated_values_codec);
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
index b789f6da..ef752be7 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/timestamp.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/timestamp.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -51,6 +53,8 @@ namespace Google.Protobuf.WellKnownTypes {
   /// and from  RFC 3339 date strings.
   /// See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
   ///
+  /// # Examples
+  ///
   /// Example 1: Compute Timestamp from POSIX `time()`.
   ///
   ///     Timestamp timestamp;
@@ -89,9 +93,35 @@ namespace Google.Protobuf.WellKnownTypes {
   ///
   ///     timestamp = Timestamp()
   ///     timestamp.GetCurrentTime()
+  ///
+  /// # JSON Mapping
+  ///
+  /// In JSON format, the Timestamp type is encoded as a string in the
+  /// [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+  /// format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+  /// where {year} is always expressed using four digits while {month}, {day},
+  /// {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+  /// seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+  /// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+  /// is required. A proto3 JSON serializer should always use UTC (as indicated by
+  /// "Z") when printing the Timestamp type and a proto3 JSON parser should be
+  /// able to accept both UTC and other timezones (as indicated by an offset).
+  ///
+  /// For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+  /// 01:30 UTC on January 15, 2017.
+  ///
+  /// In JavaScript, one can convert a Date object to this format using the
+  /// standard [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString]
+  /// method. In Python, a standard `datetime.datetime` object can be converted
+  /// to this format using [`strftime`](https://docs.python.org/2/library/time.html#time.strftime)
+  /// with the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one
+  /// can use the Joda Time's [`ISODateTimeFormat.dateTime()`](
+  /// http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime--
+  /// ) to obtain a formatter capable of generating timestamps in this format.
   /// </summary>
   public sealed partial class Timestamp : pb::IMessage<Timestamp> {
     private static readonly pb::MessageParser<Timestamp> _parser = new pb::MessageParser<Timestamp>(() => new Timestamp());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Timestamp> Parser { get { return _parser; } }
 
@@ -116,6 +146,7 @@ namespace Google.Protobuf.WellKnownTypes {
     public Timestamp(Timestamp other) : this() {
       seconds_ = other.seconds_;
       nanos_ = other.nanos_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -171,7 +202,7 @@ namespace Google.Protobuf.WellKnownTypes {
       }
       if (Seconds != other.Seconds) return false;
       if (Nanos != other.Nanos) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -179,6 +210,9 @@ namespace Google.Protobuf.WellKnownTypes {
       int hash = 1;
       if (Seconds != 0L) hash ^= Seconds.GetHashCode();
       if (Nanos != 0) hash ^= Nanos.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -197,6 +231,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(16);
         output.WriteInt32(Nanos);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -208,6 +245,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Nanos != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Nanos);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -222,6 +262,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Nanos != 0) {
         Nanos = other.Nanos;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -230,7 +271,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Seconds = input.ReadInt64();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
index 7375b6cb..3e2fe541 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/type.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/type.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -94,6 +96,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Type : pb::IMessage<Type> {
     private static readonly pb::MessageParser<Type> _parser = new pb::MessageParser<Type>(() => new Type());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Type> Parser { get { return _parser; } }
 
@@ -120,8 +123,9 @@ namespace Google.Protobuf.WellKnownTypes {
       fields_ = other.fields_.Clone();
       oneofs_ = other.oneofs_.Clone();
       options_ = other.options_.Clone();
-      SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      sourceContext_ = other.sourceContext_ != null ? other.sourceContext_.Clone() : null;
       syntax_ = other.syntax_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -229,7 +233,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!options_.Equals(other.options_)) return false;
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
       if (Syntax != other.Syntax) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -241,6 +245,9 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= options_.GetHashCode();
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
       if (Syntax != 0) hash ^= Syntax.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -266,6 +273,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(48);
         output.WriteEnum((int) Syntax);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -283,6 +293,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Syntax != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -306,6 +319,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Syntax != 0) {
         Syntax = other.Syntax;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -314,7 +328,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -354,6 +368,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Field : pb::IMessage<Field> {
     private static readonly pb::MessageParser<Field> _parser = new pb::MessageParser<Field>(() => new Field());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Field> Parser { get { return _parser; } }
 
@@ -386,6 +401,7 @@ namespace Google.Protobuf.WellKnownTypes {
       options_ = other.options_.Clone();
       jsonName_ = other.jsonName_;
       defaultValue_ = other.defaultValue_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -557,7 +573,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!options_.Equals(other.options_)) return false;
       if (JsonName != other.JsonName) return false;
       if (DefaultValue != other.DefaultValue) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -573,6 +589,9 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= options_.GetHashCode();
       if (JsonName.Length != 0) hash ^= JsonName.GetHashCode();
       if (DefaultValue.Length != 0) hash ^= DefaultValue.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -620,6 +639,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(90);
         output.WriteString(DefaultValue);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -653,6 +675,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (DefaultValue.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(DefaultValue);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -689,6 +714,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.DefaultValue.Length != 0) {
         DefaultValue = other.DefaultValue;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -697,7 +723,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             kind_ = (global::Google.Protobuf.WellKnownTypes.Field.Types.Kind) input.ReadEnum();
@@ -861,6 +887,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Enum : pb::IMessage<Enum> {
     private static readonly pb::MessageParser<Enum> _parser = new pb::MessageParser<Enum>(() => new Enum());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Enum> Parser { get { return _parser; } }
 
@@ -886,8 +913,9 @@ namespace Google.Protobuf.WellKnownTypes {
       name_ = other.name_;
       enumvalue_ = other.enumvalue_.Clone();
       options_ = other.options_.Clone();
-      SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      sourceContext_ = other.sourceContext_ != null ? other.sourceContext_.Clone() : null;
       syntax_ = other.syntax_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -981,7 +1009,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!options_.Equals(other.options_)) return false;
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
       if (Syntax != other.Syntax) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -992,6 +1020,9 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= options_.GetHashCode();
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
       if (Syntax != 0) hash ^= Syntax.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1016,6 +1047,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(40);
         output.WriteEnum((int) Syntax);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1032,6 +1066,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Syntax != 0) {
         size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1054,6 +1091,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Syntax != 0) {
         Syntax = other.Syntax;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1062,7 +1100,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1098,6 +1136,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class EnumValue : pb::IMessage<EnumValue> {
     private static readonly pb::MessageParser<EnumValue> _parser = new pb::MessageParser<EnumValue>(() => new EnumValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<EnumValue> Parser { get { return _parser; } }
 
@@ -1123,6 +1162,7 @@ namespace Google.Protobuf.WellKnownTypes {
       name_ = other.name_;
       number_ = other.number_;
       options_ = other.options_.Clone();
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1187,7 +1227,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Name != other.Name) return false;
       if (Number != other.Number) return false;
       if(!options_.Equals(other.options_)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1196,6 +1236,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (Number != 0) hash ^= Number.GetHashCode();
       hash ^= options_.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1215,6 +1258,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteInt32(Number);
       }
       options_.WriteTo(output, _repeated_options_codec);
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1227,6 +1273,9 @@ namespace Google.Protobuf.WellKnownTypes {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Number);
       }
       size += options_.CalculateSize(_repeated_options_codec);
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1242,6 +1291,7 @@ namespace Google.Protobuf.WellKnownTypes {
         Number = other.Number;
       }
       options_.Add(other.options_);
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1250,7 +1300,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
@@ -1276,6 +1326,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Option : pb::IMessage<Option> {
     private static readonly pb::MessageParser<Option> _parser = new pb::MessageParser<Option>(() => new Option());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Option> Parser { get { return _parser; } }
 
@@ -1299,7 +1350,8 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Option(Option other) : this() {
       name_ = other.name_;
-      Value = other.value_ != null ? other.Value.Clone() : null;
+      value_ = other.value_ != null ? other.value_.Clone() : null;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1356,7 +1408,7 @@ namespace Google.Protobuf.WellKnownTypes {
       }
       if (Name != other.Name) return false;
       if (!object.Equals(Value, other.Value)) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1364,6 +1416,9 @@ namespace Google.Protobuf.WellKnownTypes {
       int hash = 1;
       if (Name.Length != 0) hash ^= Name.GetHashCode();
       if (value_ != null) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1382,6 +1437,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(18);
         output.WriteMessage(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1393,6 +1451,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (value_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1410,6 +1471,7 @@ namespace Google.Protobuf.WellKnownTypes {
         }
         Value.MergeFrom(other.Value);
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1418,7 +1480,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Name = input.ReadString();
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
index 9a5fb81e..25a65aa7 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
@@ -1,5 +1,7 @@
-// Generated by the protocol buffer compiler.  DO NOT EDIT!
-// source: google/protobuf/wrappers.proto
+// <auto-generated>
+//     Generated by the protocol buffer compiler.  DO NOT EDIT!
+//     source: google/protobuf/wrappers.proto
+// </auto-generated>
 #pragma warning disable 1591, 0612, 3021
 #region Designer generated code
 
@@ -57,6 +59,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class DoubleValue : pb::IMessage<DoubleValue> {
     private static readonly pb::MessageParser<DoubleValue> _parser = new pb::MessageParser<DoubleValue>(() => new DoubleValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<DoubleValue> Parser { get { return _parser; } }
 
@@ -80,6 +83,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public DoubleValue(DoubleValue other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -114,14 +118,17 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      if (Value != other.Value) return false;
-      return true;
+      if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals(Value, other.Value)) return false;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
-      if (Value != 0D) hash ^= Value.GetHashCode();
+      if (Value != 0D) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode(Value);
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -136,6 +143,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(9);
         output.WriteDouble(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -144,6 +154,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0D) {
         size += 1 + 8;
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -155,6 +168,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0D) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -163,7 +177,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 9: {
             Value = input.ReadDouble();
@@ -182,6 +196,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class FloatValue : pb::IMessage<FloatValue> {
     private static readonly pb::MessageParser<FloatValue> _parser = new pb::MessageParser<FloatValue>(() => new FloatValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<FloatValue> Parser { get { return _parser; } }
 
@@ -205,6 +220,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public FloatValue(FloatValue other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -239,14 +255,17 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ReferenceEquals(other, this)) {
         return true;
       }
-      if (Value != other.Value) return false;
-      return true;
+      if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals(Value, other.Value)) return false;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
-      if (Value != 0F) hash ^= Value.GetHashCode();
+      if (Value != 0F) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode(Value);
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -261,6 +280,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(13);
         output.WriteFloat(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -269,6 +291,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0F) {
         size += 1 + 4;
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -280,6 +305,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0F) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -288,7 +314,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 13: {
             Value = input.ReadFloat();
@@ -307,6 +333,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Int64Value : pb::IMessage<Int64Value> {
     private static readonly pb::MessageParser<Int64Value> _parser = new pb::MessageParser<Int64Value>(() => new Int64Value());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Int64Value> Parser { get { return _parser; } }
 
@@ -330,6 +357,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Int64Value(Int64Value other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -365,13 +393,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != 0L) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -386,6 +417,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(8);
         output.WriteInt64(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -394,6 +428,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0L) {
         size += 1 + pb::CodedOutputStream.ComputeInt64Size(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -405,6 +442,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0L) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -413,7 +451,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Value = input.ReadInt64();
@@ -432,6 +470,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class UInt64Value : pb::IMessage<UInt64Value> {
     private static readonly pb::MessageParser<UInt64Value> _parser = new pb::MessageParser<UInt64Value>(() => new UInt64Value());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<UInt64Value> Parser { get { return _parser; } }
 
@@ -455,6 +494,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public UInt64Value(UInt64Value other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -490,13 +530,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != 0UL) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -511,6 +554,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(8);
         output.WriteUInt64(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -519,6 +565,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0UL) {
         size += 1 + pb::CodedOutputStream.ComputeUInt64Size(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -530,6 +579,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0UL) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -538,7 +588,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Value = input.ReadUInt64();
@@ -557,6 +607,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class Int32Value : pb::IMessage<Int32Value> {
     private static readonly pb::MessageParser<Int32Value> _parser = new pb::MessageParser<Int32Value>(() => new Int32Value());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<Int32Value> Parser { get { return _parser; } }
 
@@ -580,6 +631,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public Int32Value(Int32Value other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -615,13 +667,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -636,6 +691,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(8);
         output.WriteInt32(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -644,6 +702,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0) {
         size += 1 + pb::CodedOutputStream.ComputeInt32Size(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -655,6 +716,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -663,7 +725,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Value = input.ReadInt32();
@@ -682,6 +744,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class UInt32Value : pb::IMessage<UInt32Value> {
     private static readonly pb::MessageParser<UInt32Value> _parser = new pb::MessageParser<UInt32Value>(() => new UInt32Value());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<UInt32Value> Parser { get { return _parser; } }
 
@@ -705,6 +768,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public UInt32Value(UInt32Value other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -740,13 +804,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -761,6 +828,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(8);
         output.WriteUInt32(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -769,6 +839,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != 0) {
         size += 1 + pb::CodedOutputStream.ComputeUInt32Size(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -780,6 +853,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -788,7 +862,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Value = input.ReadUInt32();
@@ -807,6 +881,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class BoolValue : pb::IMessage<BoolValue> {
     private static readonly pb::MessageParser<BoolValue> _parser = new pb::MessageParser<BoolValue>(() => new BoolValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<BoolValue> Parser { get { return _parser; } }
 
@@ -830,6 +905,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public BoolValue(BoolValue other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -865,13 +941,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value != false) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -886,6 +965,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(8);
         output.WriteBool(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -894,6 +976,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value != false) {
         size += 1 + 1;
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -905,6 +990,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value != false) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -913,7 +999,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 8: {
             Value = input.ReadBool();
@@ -932,6 +1018,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class StringValue : pb::IMessage<StringValue> {
     private static readonly pb::MessageParser<StringValue> _parser = new pb::MessageParser<StringValue>(() => new StringValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<StringValue> Parser { get { return _parser; } }
 
@@ -955,6 +1042,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public StringValue(StringValue other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -990,13 +1078,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value.Length != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1011,6 +1102,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(10);
         output.WriteString(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1019,6 +1113,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1030,6 +1127,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value.Length != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1038,7 +1136,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Value = input.ReadString();
@@ -1057,6 +1155,7 @@ namespace Google.Protobuf.WellKnownTypes {
   /// </summary>
   public sealed partial class BytesValue : pb::IMessage<BytesValue> {
     private static readonly pb::MessageParser<BytesValue> _parser = new pb::MessageParser<BytesValue>(() => new BytesValue());
+    private pb::UnknownFieldSet _unknownFields;
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pb::MessageParser<BytesValue> Parser { get { return _parser; } }
 
@@ -1080,6 +1179,7 @@ namespace Google.Protobuf.WellKnownTypes {
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public BytesValue(BytesValue other) : this() {
       value_ = other.value_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1115,13 +1215,16 @@ namespace Google.Protobuf.WellKnownTypes {
         return true;
       }
       if (Value != other.Value) return false;
-      return true;
+      return Equals(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override int GetHashCode() {
       int hash = 1;
       if (Value.Length != 0) hash ^= Value.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
       return hash;
     }
 
@@ -1136,6 +1239,9 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(10);
         output.WriteBytes(Value);
       }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1144,6 +1250,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (Value.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeBytesSize(Value);
       }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
       return size;
     }
 
@@ -1155,6 +1264,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (other.Value.Length != 0) {
         Value = other.Value;
       }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1163,7 +1273,7 @@ namespace Google.Protobuf.WellKnownTypes {
       while ((tag = input.ReadTag()) != 0) {
         switch(tag) {
           default:
-            input.SkipLastField();
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
             break;
           case 10: {
             Value = input.ReadBytes();
diff --git a/csharp/src/Google.Protobuf/project.json b/csharp/src/Google.Protobuf/project.json
deleted file mode 100644
index 961e037e..00000000
--- a/csharp/src/Google.Protobuf/project.json
+++ /dev/null
@@ -1,65 +0,0 @@
-{
-  "version": "3.2.0",
-  "title": "Google Protocol Buffers",
-  "description": "See project site for more info.",
-  "authors": [ "Google Inc." ],
-  "copyright": "Copyright 2015, Google Inc.",
-
-  "packOptions": {
-    "summary": "C# runtime library for Protocol Buffers - Google's data interchange format.",
-    "tags": [ "Protocol", "Buffers", "Binary", "Serialization", "Format", "Google", "proto", "proto3" ],
-    "owners": [ "protobuf-packages" ],
-    "licenseUrl": "https://github.com/google/protobuf/blob/master/LICENSE",
-    "projectUrl": "https://github.com/google/protobuf",
-    "releaseNotes": "C# proto3 support",
-    "requireLicenseAcceptance": false,
-    "repository": {
-      "url": "https://github.com/nodatime/nodatime.git"
-    }
-  },
-
-  "buildOptions": {
-    "debugType": "portable",
-    "keyFile": "../../keys/Google.Protobuf.snk",
-    "xmlDoc": true
-  },
-
-  "configurations": {
-    "Debug": {
-      "buildOptions": {
-        "define": [ "DEBUG", "TRACE" ]
-      }
-    },
-    "Release": {
-      "buildOptions": {
-        "define": [ "RELEASE", "TRACE" ],
-        "optimize": true
-      }
-    }
-  },
-
-  "frameworks": {
-    // This target allows the package to be installed in a .NET 4.5+
-    // project without asking for myriad other dependencies.
-    "net45": {
-    },
-    "netstandard1.0": {
-      "dependencies": {
-        "System.Collections": "4.0.11",
-        "System.Diagnostics.Debug": "4.0.11",
-        "System.Globalization": "4.0.11",
-        "System.IO": "4.1.0",
-        "System.Linq": "4.1.0",
-        "System.Linq.Expressions": "4.1.0",
-        "System.ObjectModel": "4.0.12",
-        "System.Reflection": "4.1.0",
-        "System.Reflection.Extensions": "4.0.1",
-        "System.Runtime": "4.1.0",
-        "System.Runtime.Extensions": "4.1.0",
-        "System.Text.Encoding": "4.0.11",
-        "System.Text.RegularExpressions": "4.1.0",
-        "System.Threading": "4.0.11"
-      }
-    }
-  }
-}
diff --git a/csharp/src/global.json b/csharp/src/global.json
deleted file mode 100644
index 9d5558b1..00000000
--- a/csharp/src/global.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "sdk": {
-    "version": "1.0.0-preview2-003131"
-  }
-}
diff --git a/csharp/src/packages/repositories.config b/csharp/src/packages/repositories.config
deleted file mode 100644
index 70379412..00000000
--- a/csharp/src/packages/repositories.config
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<repositories>
-  <repository path="..\Google.Protobuf.Test\packages.config" />
-</repositories>
\ No newline at end of file
diff --git a/docs/performance.md b/docs/performance.md
new file mode 100644
index 00000000..6a5316c8
--- /dev/null
+++ b/docs/performance.md
@@ -0,0 +1,304 @@
+# Protobuf Perforamcne
+This benchmark result is tested on workstation with processor of Intel® Xeon® Processor E5-2630 and 32GB RAM
+
+This table contains 3 languages' results:
+
+* **C++** - For C++ there're 3 kinds of parsing ways:
+	* **new** - This is for using new operator for creating message instance.
+    * **new arena** - This is for using arena for creating new message instance.
+    * **reuse** - This is for reusing the same message instance for parsing.
+* **Java** - For Java there're 3 kinds of parsing/Serialization ways:
+	* **byte[]** - This is for parsing from a Byte Array.
+    * **ByteString** - This is for parsing from a 
+    	com.google.protobuf.ByteString.
+    * **InputStream** - This is for parsing from a InputStream
+* **Python** - For Pythong there're 3 kinds of python protobuf for testing:
+	* **C++-genereated-code** - This is for using cpp generated code of the 
+    	proto file as dynamic linked library.
+	* **C++-reflection** - This is for using cpp reflection, which there's no
+    	generated code, but still using cpp protobuf library as dynamic linked 
+        library.
+	* **pure-Python** - This is for pure Python version, which don't link with 
+    	any cpp protobuf library.
+
+## Parsing performance
+
+<table>
+<tbody><tr>
+<th rowspan="2"> </th>
+<th colspan="3" rowspan="1">C++</th>
+<th colspan="3" rowspan="1">C++ with tcmalloc</th>
+<th colspan="3" rowspan="1">java</th>
+<th colspan="3" rowspan="1">python</th>
+</tr>
+<tr>
+<th colspan="1">new</th>
+<th colspan="1">new arena</th>
+<th colspan="1">reuse</th>
+<th colspan="1">new</th>
+<th colspan="1">new arena</th>
+<th colspan="1">reuse</th>
+<th colspan="1">byte[]</th>
+<th colspan="1">ByteString</th>
+<th colspan="1">InputStream</th>
+<th colspan="1">C++-generated-code</th>
+<th colspan="1">C++-reflection</th>
+<th colspan="1">pure-Python</th>
+</tr>
+<tr>
+<td>google_message1_proto2</td>
+<td>368.717MB/s</td>
+<td>261.847MB/s</td>
+<td>799.403MB/s</td>
+<td>645.183MB/s</td>
+<td>441.023MB/s</td>
+<td>1.122GB/s</td>
+<td>425.437MB/s</td>
+<td>425.937MB/s</td>
+<td>251.018MB/s</td>
+<td>82.8314MB/s</td>
+<td>47.6763MB/s</td>
+<td>3.76299MB/s</td>
+</tr>
+<tr>
+<td>google_message1_proto3</td>
+<td>294.517MB/s</td>
+<td>229.116MB/s</td>
+<td>469.982MB/s</td>
+<td>434.510MB/s</td>
+<td>394.701MB/s</td>
+<td>591.931MB/s</td>
+<td>357.597MB/s</td>
+<td>378.568MB/s</td>
+<td>221.676MB/s</td>
+<td>82.0498MB/s</td>
+<td>39.9467MB/s</td>
+<td>3.77751MB/s</td>
+</tr>
+<tr>
+<td>google_message2</td>
+<td>277.242MB/s</td>
+<td>347.611MB/s</td>
+<td>793.67MB/s</td>
+<td>503.721MB/s</td>
+<td>596.333MB/s</td>
+<td>922.533MB/s</td>
+<td>416.778MB/s</td>
+<td>419.543MB/s</td>
+<td>367.145MB/s</td>
+<td>241.46MB/s</td>
+<td>71.5723MB/s</td>
+<td>2.73538MB/s</td>
+</tr>
+<tr>
+<td>google_message3_1</td>
+<td>213.478MB/s</td>
+<td>291.58MB/s</td>
+<td>543.398MB/s</td>
+<td>539.704MB/s</td>
+<td>717.300MB/s</td>
+<td>927.333MB/s</td>
+<td>684.241MB/s</td>
+<td>704.47MB/s</td>
+<td>648.624MB/s</td>
+<td>209.036MB/s</td>
+<td>142.356MB/s</td>
+<td>15.3324MB/s</td>
+</tr>
+<tr>
+<td>google_message3_2</td>
+<td>672.685MB/s</td>
+<td>802.767MB/s</td>
+<td>1.21505GB/s</td>
+<td>985.790MB/s</td>
+<td>1.136GB/s</td>
+<td>1.367GB/s</td>
+<td>1.54439GB/s</td>
+<td>1.60603GB/s</td>
+<td>1.33443GB/s</td>
+<td>573.835MB/s</td>
+<td>314.33MB/s</td>
+<td>15.0169MB/s</td>
+</tr>
+<tr>
+<td>google_message3_3</td>
+<td>207.681MB/s</td>
+<td>140.591MB/s</td>
+<td>535.181MB/s</td>
+<td>369.743MB/s</td>
+<td>262.301MB/s</td>
+<td>556.644MB/s</td>
+<td>279.385MB/s</td>
+<td>304.853MB/s</td>
+<td>107.575MB/s</td>
+<td>32.248MB/s</td>
+<td>26.1431MB/s</td>
+<td>2.63541MB/s</td>
+</tr>
+<tr>
+<td>google_message3_4</td>
+<td>7.96091GB/s</td>
+<td>7.10024GB/s</td>
+<td>9.3013GB/s</td>
+<td>8.518GB/s</td>
+<td>8.171GB/s</td>
+<td>9.917GB/s</td>
+<td>5.78006GB/s</td>
+<td>5.85198GB/s</td>
+<td>4.62609GB/s</td>
+<td>2.49631GB/s</td>
+<td>2.35442GB/s</td>
+<td>802.061MB/s</td>
+</tr>
+<tr>
+<td>google_message3_5</td>
+<td>76.0072MB/s</td>
+<td>51.6769MB/s</td>
+<td>237.856MB/s</td>
+<td>178.495MB/s</td>
+<td>111.751MB/s</td>
+<td>329.569MB/s</td>
+<td>121.038MB/s</td>
+<td>132.866MB/s</td>
+<td>36.9197MB/s</td>
+<td>10.3962MB/s</td>
+<td>8.84659MB/s</td>
+<td>1.25203MB/s</td>
+</tr>
+<tr>
+<td>google_message4</td>
+<td>331.46MB/s</td>
+<td>404.862MB/s</td>
+<td>427.99MB/s</td>
+<td>589.887MB/s</td>
+<td>720.367MB/s</td>
+<td>705.373MB/s</td>
+<td>606.228MB/s</td>
+<td>589.13MB/s</td>
+<td>530.692MB/s</td>
+<td>305.543MB/s</td>
+<td>174.834MB/s</td>
+<td>7.86485MB/s</td>
+</tr>
+</tbody></table>
+
+## Serialization performance
+
+<table>
+<tbody><tr>
+<th rowspan="2"> </th>
+<th colspan="1" rowspan="2">C++</th>
+<th colspan="1" rowspan="2">C++ with tcmalloc</th>
+<th colspan="3" rowspan="1">java</th>
+<th colspan="3" rowspan="1">python</th>
+</tr>
+<tr>
+<th colspan="1">byte[]</th>
+<th colspan="1">ByteString</th>
+<th colspan="1">InputStream</th>
+<th colspan="1">C++-generated-code</th>
+<th colspan="1">C++-reflection</th>
+<th colspan="1">pure-Python</th>
+</tr>
+<tr>
+<td>google_message1_proto2</td>
+<td>1.39698GB/s</td>
+<td>1.701GB/s</td>
+<td>1.12915GB/s</td>
+<td>1.13589GB/s</td>
+<td>758.609MB/s</td>
+<td>260.911MB/s</td>
+<td>58.4815MB/s</td>
+<td>5.77824MB/s</td>
+</tr>
+<tr>
+<td>google_message1_proto3</td>
+<td>959.305MB/s</td>
+<td>939.404MB/s</td>
+<td>1.15372GB/s</td>
+<td>1.07824GB/s</td>
+<td>802.337MB/s</td>
+<td>239.4MB/s</td>
+<td>33.6336MB/s</td>
+<td>5.80524MB/s</td>
+</tr>
+<tr>
+<td>google_message2</td>
+<td>1.27429GB/s</td>
+<td>1.402GB/s</td>
+<td>1.01039GB/s</td>
+<td>1022.99MB/s</td>
+<td>798.736MB/s</td>
+<td>996.755MB/s</td>
+<td>57.9601MB/s</td>
+<td>4.09246MB/s</td>
+</tr>
+<tr>
+<td>google_message3_1</td>
+<td>1.31916GB/s</td>
+<td>2.049GB/s</td>
+<td>991.496MB/s</td>
+<td>860.332MB/s</td>
+<td>662.88MB/s</td>
+<td>1.48625GB/s</td>
+<td>421.287MB/s</td>
+<td>18.002MB/s</td>
+</tr>
+<tr>
+<td>google_message3_2</td>
+<td>2.15676GB/s</td>
+<td>2.632GB/s</td>
+<td>2.14736GB/s</td>
+<td>2.08136GB/s</td>
+<td>1.55997GB/s</td>
+<td>2.39597GB/s</td>
+<td>326.777MB/s</td>
+<td>16.0527MB/s</td>
+</tr>
+<tr>
+<td>google_message3_3</td>
+<td>650.456MB/s</td>
+<td>1.040GB/s</td>
+<td>593.52MB/s</td>
+<td>580.667MB/s</td>
+<td>346.839MB/s</td>
+<td>123.978MB/s</td>
+<td>35.893MB/s</td>
+<td>2.32834MB/s</td>
+</tr>
+<tr>
+<td>google_message3_4</td>
+<td>8.70154GB/s</td>
+<td>9.825GB/s</td>
+<td>5.88645GB/s</td>
+<td>5.93946GB/s</td>
+<td>2.44388GB/s</td>
+<td>5.9241GB/s</td>
+<td>4.05837GB/s</td>
+<td>876.87MB/s</td>
+</tr>
+<tr>
+<td>google_message3_5</td>
+<td>246.33MB/s</td>
+<td>443.993MB/s</td>
+<td>283.278MB/s</td>
+<td>259.167MB/s</td>
+<td>206.37MB/s</td>
+<td>37.0285MB/s</td>
+<td>12.2228MB/s</td>
+<td>1.1979MB/s</td>
+</tr>
+<tr>
+<td>google_message4</td>
+<td>1.56674GB/s</td>
+<td>2.19601GB/s</td>
+<td>776.907MB/s</td>
+<td>770.707MB/s</td>
+<td>702.931MB/s</td>
+<td>1.49623GB/s</td>
+<td>205.116MB/s</td>
+<td>8.93428MB/s</td>
+</tr>
+</tbody></table>
+
+\* The cpp performance can be improved by using [tcmalloc](https://gperftools.github.io/gperftools/tcmalloc.html), please follow the (instruction)[https://github.com/google/protobuf/blob/master/benchmarks/README.md] to link with tcmalloc to get the faster result.
diff --git a/docs/third_party.md b/docs/third_party.md
index a1f918a7..f11f0cba 100644
--- a/docs/third_party.md
+++ b/docs/third_party.md
@@ -25,6 +25,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Clojure: http://github.com/ninjudd/clojure-protobuf
 * Common Lisp: http://github.com/ndantam/s-protobuf
 * Common Lisp: http://github.com/brown/protobuf
+* D: https://github.com/dcarp/protobuf-d
 * D: https://github.com/msoucy/dproto
 * D: http://256.makerslocal.org/wiki/index.php/ProtocolBuffer
 * D: https://github.com/opticron/ProtocolBuffer
@@ -32,6 +33,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Delphi: http://sourceforge.net/projects/protobuf-delphi/
 * Delphi: http://fundementals.sourceforge.net/dl.html
 * Elixir: https://github.com/jeremyong/exprotoc
+* Elixir: https://github.com/tony612/protobuf-elixir
 * Elm: https://github.com/tiziano88/elm-protobuf
 * Erlang: http://github.com/ngerakines/erlang_protobuffs/tree/master
 * Erlang: http://piqi.org/
@@ -39,9 +41,12 @@ These are projects we know about implementing Protocol Buffers for other program
 * Erlang: https://github.com/basho/erlang_protobuffs
 * Erlang: https://github.com/tomas-abrahamsson/gpb
 * Go: https://github.com/golang/protobuf (Google-official implementation)
-* Go: http://code.google.com/p/goprotobuf/
 * Go: https://github.com/akunspy/gopbuf
+* Go: https://github.com/gogo/protobuf
+* GopherJS: https://github.com/johanbrandhorst/protobuf
 * Haskell: http://hackage.haskell.org/package/hprotoc
+* Haskell: https://github.com/google/proto-lens (Google-unofficial implementation)
+* Haskell: https://github.com/awakesecurity/proto3-suite (code generator) https://github.com/awakesecurity/proto3-wire (binary serializer/deserializer)
 * Haxe: https://github.com/Atry/protoc-gen-haxe
 * Java: https://github.com/google/protobuf (Google-official implementation)
 * Java/Android: https://github.com/square/wire
@@ -54,6 +59,7 @@ These are projects we know about implementing Protocol Buffers for other program
 * Javascript: http://code.google.com/p/protobuf-for-node/
 * Javascript: http://code.google.com/p/protostuff/
 * Julia: https://github.com/tanmaykm/ProtoBuf.jl
+* Kotlin: https://github.com/Kotlin/kotlinx.serialization
 * Lua: http://code.google.com/p/protoc-gen-lua/
 * Lua: http://github.com/indygreg/lua-protobuf
 * Lua: https://github.com/Neopallium/lua-pb
@@ -106,7 +112,6 @@ GRPC (http://www.grpc.io/) is Google's RPC implementation for Protocol Buffers.
 * http://code.google.com/p/cxf-protobuf/ (Java)
 * http://code.google.com/p/protobuf-remote/ (C++/C#)
 * http://code.google.com/p/protobuf-rpc-pro/ (Java)
-* https://code.google.com/p/protorpc/ (Go/C++)
 * https://code.google.com/p/eneter-protobuf-serializer/ (Java/.NET)
 * http://www.deltavsoft.com/RCFProto.html (C++/Java/Python/C#)
 * https://github.com/robbinfan/claire-protorpc (C++)
@@ -116,6 +121,11 @@ GRPC (http://www.grpc.io/) is Google's RPC implementation for Protocol Buffers.
 * https://github.com/thesamet/rpcz (C++/Python, based on ZeroMQ)
 * https://github.com/w359405949/libmaid (C++, Python)
 * https://github.com/madwyn/libpbrpc (C++)
+* https://github.com/SeriousMa/grpc-protobuf-validation (Java)
+* https://github.com/tony612/grpc-elixir (Elixir)
+* https://github.com/johanbrandhorst/protobuf (GopherJS)
+* https://github.com/awakesecurity/gRPC-haskell (Haskell)
+* https://github.com/Yeolar/raster (C++)
 
 ## Other Utilities
 
@@ -140,7 +150,7 @@ There are miscellaneous other things you may find useful as a Protocol Buffers d
     * http://igor-petruk.github.com/protobuf-maven-plugin/
     * http://code.google.com/p/maven-protoc-plugin/
     * https://github.com/os72/protoc-jar-maven-plugin
-* [Documentation generator plugin (Markdown/HTML/DocBook/...)](https://github.com/estan/protoc-gen-doc)
+* [Documentation generator plugin (Markdown/HTML/DocBook/...)](https://github.com/pseudomuto/protoc-gen-doc)
 * [DocBook generator for .proto files](http://code.google.com/p/protoc-gen-docbook/)
 * [Protobuf for nginx module](https://github.com/dbcode/protobuf-nginx/)
 * [RSpec matchers and Cucumber step defs for testing Protocol Buffers](https://github.com/connamara/protobuf_spec)
@@ -153,4 +163,7 @@ There are miscellaneous other things you may find useful as a Protocol Buffers d
 * [ProtoBuf with Java EE7 Expression Language 3.0; pure Java ProtoBuf Parser and Builder.](https://github.com/protobufel/protobuf-el)
 * [Notepad++ Syntax Highlighting for .proto files](https://github.com/chai2010/notepadplus-protobuf)
 * [Linter for .proto files](https://github.com/ckaznocha/protoc-gen-lint)
-* [Protocol Buffers Dynamic Schema - create protobuf schemas programmatically (Java)] (https://github.com/os72/protobuf-dynamic)
+* [Protocol Buffers Dynamic Schema - create protobuf schemas programmatically (Java)](https://github.com/os72/protobuf-dynamic)
+* [Make protoc plugins in NodeJS](https://github.com/konsumer/node-protoc-plugin)
+* [ProfaneDB - A Protocol Buffers database](https://profanedb.gitlab.io)
+* [Protocol Buffer property-based testing utility and example message generator (Python / Hypothesis)](https://github.com/CurataEng/hypothesis-protobuf)
diff --git a/editors/protobuf-mode.el b/editors/protobuf-mode.el
index 1cef4137..d3bdcded 100644
--- a/editors/protobuf-mode.el
+++ b/editors/protobuf-mode.el
@@ -64,9 +64,11 @@
 ;;; Code:
 
 (require 'cc-mode)
-(require 'cl)
 
 (eval-when-compile
+  (and (= emacs-major-version 24)
+       (>= emacs-minor-version 4)
+       (require 'cl))
   (require 'cc-langs)
   (require 'cc-fonts))
 
diff --git a/examples/BUILD b/examples/BUILD
new file mode 100644
index 00000000..d5d5d9a5
--- /dev/null
+++ b/examples/BUILD
@@ -0,0 +1,101 @@
+# This BUILD file shows how to use protobuf with bazel. Before you can use
+# proto_library/<lang>_proto_library rules in a BUILD file, you need to
+# include protobuf repo as remote repositories in your WORKSPACE file. See
+# the WORKSPACE file in the same directory with this BUILD file for an
+# example.
+
+# For each .proto file, a proto_library target should be defined. This target
+# is not bound to any particular language. Instead, it defines the dependency
+# graph of the .proto files (i.e., proto imports) and serves as the provider
+# of .proto source files to the protocol compiler.
+#
+# Remote repository "com_google_protobuf" must be defined to use this rule.
+proto_library(
+    name = "addressbook_proto",
+    srcs = ["addressbook.proto"],
+    deps = ["@com_google_protobuf//:timestamp_proto"],
+)
+
+# The cc_proto_library rule generates C++ code for a proto_library rule. It
+# must have exactly one proto_library dependency. If you want to use multiple
+# proto_library targets, create a separate cc_proto_library target for each
+# of them.
+#
+# Remote repository "com_google_protobuf_cc" must be defined to use this rule.
+cc_proto_library(
+    name = "addressbook_cc_proto",
+    deps = [":addressbook_proto"],
+)
+
+# cc_library/cc_binary targets can depend on cc_proto_library targets.
+cc_binary(
+    name = "add_person_cpp",
+    srcs = ["add_person.cc"],
+    deps = [":addressbook_cc_proto"],
+)
+
+cc_binary(
+    name = "list_people_cpp",
+    srcs = ["list_people.cc"],
+    deps = [":addressbook_cc_proto"],
+)
+
+# Similar to cc_proto_library but for Java.
+#
+# Remote repository "com_google_protobuf_java" must be defined to use this rule.
+java_proto_library(
+    name = "addressbook_java_proto",
+    deps = [":addressbook_proto"],
+)
+
+java_binary(
+    name = "add_person_java",
+    srcs = ["AddPerson.java"],
+    main_class = "AddPerson",
+    deps = [":addressbook_java_proto"],
+)
+
+java_binary(
+    name = "list_people_java",
+    srcs = ["ListPeople.java"],
+    main_class = "ListPeople",
+    deps = [":addressbook_java_proto"],
+)
+
+# Java lite.
+#
+# Remote repository "com_google_protobuf_javalite" must be defined to use this
+# rule.
+java_lite_proto_library(
+    name = "addressbook_java_lite_proto",
+    deps = [":addressbook_proto"],
+)
+
+# Java lite API is a subset of the regular Java API so if you only uses this
+# subset in your code, you can actually compile your code against both (i.e.,
+# share code between server build and Android build).
+#
+# The lite version has a smaller code size, and you can see that by comparing
+# the resulted .jar file:
+#
+#   $ bazel build :add_person_java_deploy.jar :add_person_java_lite_deploy.jar
+#   $ ls -l bazel-bin/*_deploy.jar
+#   -r-xr-xr-x 1 xiaofeng eng 1230797 Sep  8 12:24 bazel-bin/add_person_java_deploy.jar
+#   -r-xr-xr-x 1 xiaofeng eng  236166 Sep  8 12:24 bazel-bin/add_person_java_lite_deploy.jar
+#
+# In the above example, the lite .jar file is 6 times smaller. With proper
+# proguard inlining/stripping, the difference can be much more larger than
+# that.
+java_binary(
+    name = "add_person_java_lite",
+    srcs = ["AddPerson.java"],
+    main_class = "AddPerson",
+    deps = [":addressbook_java_lite_proto"],
+)
+
+java_binary(
+    name = "list_people_java_lite",
+    srcs = ["ListPeople.java"],
+    main_class = "ListPeople",
+    deps = [":addressbook_java_lite_proto"],
+)
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 2cd2acc0..3e8e6541 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -32,22 +32,6 @@ foreach(example add_person list_people)
   if(protobuf_MODULE_COMPATIBLE) #Legacy Support
     protobuf_generate_cpp(${example}_PROTO_SRCS ${example}_PROTO_HDRS ${${example}_PROTOS})
     list(APPEND ${example}_SRCS ${${example}_PROTO_SRCS} ${${example}_PROTO_HDRS})
-  else()
-
-    foreach(proto_file ${${example}_PROTOS})
-      get_filename_component(proto_file_abs ${proto_file} ABSOLUTE)
-      get_filename_component(basename ${proto_file} NAME_WE)
-      set(generated_files ${basename}.pb.cc ${basename}.pb.h)
-      list(APPEND ${example}_SRCS ${generated_files})
-
-      add_custom_command(
-        OUTPUT ${generated_files}
-        COMMAND protobuf::protoc
-        ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} -I ${CMAKE_CURRENT_SOURCE_DIR} ${proto_file_abs}
-        COMMENT "Generating ${generated_files} from ${proto_file}"
-        VERBATIM
-      )
-    endforeach()
   endif()
 
   #Executable setup
@@ -58,6 +42,7 @@ foreach(example add_person list_people)
     target_link_libraries(${executable_name} ${PROTOBUF_LIBRARIES})
   else()
     target_link_libraries(${executable_name} protobuf::libprotobuf)
+    protobuf_generate(TARGET ${executable_name})
   endif()
 
 endforeach()
diff --git a/examples/ListPeople.java b/examples/ListPeople.java
index 78924305..580f7ac2 100644
--- a/examples/ListPeople.java
+++ b/examples/ListPeople.java
@@ -27,6 +27,9 @@ class ListPeople {
           case WORK:
             System.out.print("  Work phone #: ");
             break;
+          default:
+            System.out.println(" Unknown phone #: ");
+            break;
         }
         System.out.println(phoneNumber.getNumber());
       }
diff --git a/examples/Makefile b/examples/Makefile
index 51f13426..1ff7fa7f 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -22,12 +22,12 @@ clean:
 	rmdir com 2>/dev/null || true
 
 protoc_middleman: addressbook.proto
-	protoc --cpp_out=. --java_out=. --python_out=. addressbook.proto
+	protoc $$PROTO_PATH --cpp_out=. --java_out=. --python_out=. addressbook.proto
 	@touch protoc_middleman
 
 protoc_middleman_go: addressbook.proto
-	mkdir tutorial # make directory for go package
-	protoc --go_out=tutorial addressbook.proto
+	mkdir -p tutorial # make directory for go package
+	protoc $$PROTO_PATH --go_out=tutorial addressbook.proto
 	@touch protoc_middleman_go
 
 add_person_cpp: add_person.cc protoc_middleman
@@ -51,7 +51,7 @@ list_people_gotest: list_people.go list_people_go
 	go test list_people.go list_people_test.go
 
 javac_middleman: AddPerson.java ListPeople.java protoc_middleman
-	javac AddPerson.java ListPeople.java com/example/tutorial/AddressBookProtos.java
+	javac -cp $$CLASSPATH AddPerson.java ListPeople.java com/example/tutorial/AddressBookProtos.java
 	@touch javac_middleman
 
 add_person_java: javac_middleman
diff --git a/examples/README.md b/examples/README.md
new file mode 100644
index 00000000..20f285cd
--- /dev/null
+++ b/examples/README.md
@@ -0,0 +1,124 @@
+# Protocol Buffers - Code Example
+
+This directory contains example code that uses Protocol Buffers to manage an
+address book. Two programs are provided for each supported language. The
+add_person example adds a new person to an address book, prompting the user to
+input the person's information. The list_people example lists people already in
+the address book. The examples use the exact same format in all three languages,
+so you can, for example, use add_person_java to create an address book and then
+use list_people_python to read it.
+
+These examples are part of the Protocol Buffers tutorial, located at:
+  https://developers.google.com/protocol-buffers/docs/tutorials
+
+## Build the example using bazel
+
+The example requires bazel 0.5.4 or newer to build. You can download/install
+the latest version of bazel from bazel's release page:
+
+    https://github.com/bazelbuild/bazel/releases
+
+Once you have bazel installed, simply run the following command in this examples
+directory to build the code:
+
+    $ bazel build :all
+
+Then you can run the built binary:
+
+    $ bazel-bin/add_person_cpp addressbook.data
+
+To use protobuf in your own bazel project, please follow instructions in the
+[BUILD](BUILD) file and [WORKSPACE](WORKSPACE) file.
+
+## Build the example using make
+
+You must install the protobuf package before you can build it using make. The
+minimum requirement is to install protocol compiler (i.e., the protoc binary)
+and the protobuf runtime for the language you want to build.
+
+You can simply run "make" to build the example for all languages (except for
+Go). However, since different language has different installation requirement,
+it will likely fail. It's better to follow individual instrutions below to
+build only the language you are interested in.
+
+### C++
+
+You can follow instructions in [../src/README.md](../src/README.md) to install
+protoc and protobuf C++ runtime from source.
+
+Then run "make cpp" in this examples directory to build the C++ example. It
+will create two executables: add_person_cpp and list_people_cpp. These programs
+simply take an address book file as their parameter. The add_person_cpp
+programs will create the file if it doesn't already exist.
+
+To run the examples:
+
+    $ ./add_person_cpp addressbook.data
+    $ ./list_people_cpp addressbook.data
+
+Note that on some platforms you may have to edit the Makefile and remove
+"-lpthread" from the linker commands (perhaps replacing it with something else).
+We didn't do this automatically because we wanted to keep the example simple.
+
+### Python
+
+Follow instructions in [../README.md](../README.md) to install protoc and then
+follow [../python/README.md](../python/README.md) to install protobuf python
+runtime from source. You can also install python runtime using pip:
+
+    $ pip install protobuf
+
+Make sure the runtime version is the same as protoc binary, or it may not work.
+
+After you have install both protoc and python runtime, run "make python" to
+build two executables (shell scripts actually): add_person_python and
+list_people_python. They work the same way as the C++ executables.
+
+### Java
+
+Follow instructions in [../README.md](../README.md) to install protoc and then
+download protobuf Java runtime .jar file from maven:
+
+    https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java
+
+Then run the following:
+
+    $ export CLASSPATH=/path/to/protobuf-java-[version].jar
+    $ make java
+
+This will create the add_person_java/list_people_java executables (shell
+scripts) and can be used to create/display an address book data file.
+
+### Go
+
+The Go example requires a plugin to the protocol buffer compiler, so it is not
+build with all the other examples.  See:
+
+    https://github.com/golang/protobuf
+
+for more information about Go protocol buffer support.
+
+First, install the Protocol Buffers compiler (protoc).
+
+Then, install the Go Protocol Buffers plugin ($GOPATH/bin must be in your $PATH
+for protoc to find it):
+
+    go get github.com/golang/protobuf/protoc-gen-go
+
+Build the Go samples in this directory with "make go".  This creates the
+following executable files in the current directory:
+
+    add_person_go      list_people_go
+
+To run the example:
+
+    ./add_person_go addressbook.data
+
+to add a person to the protocol buffer encoded file addressbook.data.  The file
+is created if it does not exist.  To view the data, run:
+
+    ./list_people_go addressbook.data
+
+Observe that the C++, Python, and Java examples in this directory run in a
+similar way and can view/modify files created by the Go example and vice
+versa.
diff --git a/examples/README.txt b/examples/README.txt
deleted file mode 100644
index b33f8414..00000000
--- a/examples/README.txt
+++ /dev/null
@@ -1,54 +0,0 @@
-This directory contains example code that uses Protocol Buffers to manage an
-address book.  Two programs are provided, each with three different
-implementations, one written in each of C++, Java, and Python.  The add_person
-example adds a new person to an address book, prompting the user to input
-the person's information.  The list_people example lists people already in the
-address book.  The examples use the exact same format in all three languages,
-so you can, for example, use add_person_java to create an address book and then
-use list_people_python to read it.
-
-You must install the protobuf package before you can build these.
-
-To build all the examples (on a unix-like system), simply run "make".  This
-creates the following executable files in the current directory:
-  add_person_cpp     list_people_cpp
-  add_person_java    list_people_java
-  add_person_python  list_people_python
-
-If you only want to compile examples in one language, use "make cpp"*,
-"make java", or "make python".
-
-All of these programs simply take an address book file as their parameter.
-The add_person programs will create the file if it doesn't already exist.
-
-These examples are part of the Protocol Buffers tutorial, located at:
-  https://developers.google.com/protocol-buffers/docs/tutorials
-
-* Note that on some platforms you may have to edit the Makefile and remove
-"-lpthread" from the linker commands (perhaps replacing it with something else).
-We didn't do this automatically because we wanted to keep the example simple.
-
-## Go ##
-
-The Go example requires a plugin to the protocol buffer compiler, so it is not
-build with all the other examples.  See:
-  https://github.com/golang/protobuf
-for more information about Go protocol buffer support.
-
-First, install the Protocol Buffers compiler (protoc).
-Then, install the Go Protocol Buffers plugin
-($GOPATH/bin must be in your $PATH for protoc to find it):
-  go get github.com/golang/protobuf/protoc-gen-go
-
-Build the Go samples in this directory with "make go".  This creates the
-following executable files in the current directory:
-  add_person_go      list_people_go
-To run the example:
-  ./add_person_go addressbook.data
-to add a person to the protocol buffer encoded file addressbook.data.  The file
-is created if it does not exist.  To view the data, run:
-  ./list_people_go addressbook.data
-
-Observe that the C++, Python, and Java examples in this directory run in a
-similar way and can view/modify files created by the Go example and vice
-versa.
diff --git a/examples/WORKSPACE b/examples/WORKSPACE
new file mode 100644
index 00000000..936f2441
--- /dev/null
+++ b/examples/WORKSPACE
@@ -0,0 +1,35 @@
+# This com_google_protobuf repository is required for proto_library rule.
+# It provides the protocol compiler binary (i.e., protoc).
+http_archive(
+    name = "com_google_protobuf",
+    strip_prefix = "protobuf-master",
+    urls = ["https://github.com/google/protobuf/archive/master.zip"],
+)
+load("@com_google_protobuf//:protobuf.bzl", "check_protobuf_required_bazel_version")
+check_protobuf_required_bazel_version()
+
+# This com_google_protobuf_cc repository is required for cc_proto_library
+# rule. It provides protobuf C++ runtime. Note that it actually is the same
+# repo as com_google_protobuf but has to be given a different name as
+# required by bazel.
+http_archive(
+    name = "com_google_protobuf_cc",
+    strip_prefix = "protobuf-master",
+    urls = ["https://github.com/google/protobuf/archive/master.zip"],
+)
+
+# Similar to com_google_protobuf_cc but for Java (i.e., java_proto_library).
+http_archive(
+    name = "com_google_protobuf_java",
+    strip_prefix = "protobuf-master",
+    urls = ["https://github.com/google/protobuf/archive/master.zip"],
+)
+
+# Similar to com_google_protobuf_cc but for Java lite. If you are building
+# for Android, the lite version should be prefered because it has a much
+# smaller code size.
+http_archive(
+    name = "com_google_protobuf_javalite",
+    strip_prefix = "protobuf-javalite",
+    urls = ["https://github.com/google/protobuf/archive/javalite.zip"],
+)
diff --git a/examples/add_person.cc b/examples/add_person.cc
index 9bec4b37..856e90bb 100644
--- a/examples/add_person.cc
+++ b/examples/add_person.cc
@@ -1,11 +1,17 @@
 // See README.txt for information and build instructions.
 
-#include <iostream>
+#include <ctime>
 #include <fstream>
+#include <google/protobuf/util/time_util.h>
+#include <iostream>
 #include <string>
+
 #include "addressbook.pb.h"
+
 using namespace std;
 
+using google::protobuf::util::TimeUtil;
+
 // This function fills in a Person message based on user input.
 void PromptForAddress(tutorial::Person* person) {
   cout << "Enter person ID number: ";
@@ -48,6 +54,7 @@ void PromptForAddress(tutorial::Person* person) {
       cout << "Unknown phone type.  Using default." << endl;
     }
   }
+  *person->mutable_last_updated() = TimeUtil::SecondsToTimestamp(time(NULL));
 }
 
 // Main function:  Reads the entire address book from a file,
diff --git a/examples/add_person.py b/examples/add_person.py
index 0b698579..aa0fbca7 100755
--- a/examples/add_person.py
+++ b/examples/add_person.py
@@ -5,6 +5,12 @@
 import addressbook_pb2
 import sys
 
+try:
+  raw_input          # Python 2
+except NameError:
+  raw_input = input  # Python 3
+
+
 # This function fills in a Person message based on user input.
 def PromptForAddress(person):
   person.id = int(raw_input("Enter person ID number: "))
@@ -30,13 +36,14 @@ def PromptForAddress(person):
     elif type == "work":
       phone_number.type = addressbook_pb2.Person.WORK
     else:
-      print "Unknown phone type; leaving as default value."
+      print("Unknown phone type; leaving as default value.")
+
 
 # Main procedure:  Reads the entire address book from a file,
 #   adds one person based on user input, then writes it back out to the same
 #   file.
 if len(sys.argv) != 2:
-  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
+  print("Usage:", sys.argv[0], "ADDRESS_BOOK_FILE")
   sys.exit(-1)
 
 address_book = addressbook_pb2.AddressBook()
@@ -46,7 +53,7 @@ try:
   with open(sys.argv[1], "rb") as f:
     address_book.ParseFromString(f.read())
 except IOError:
-  print sys.argv[1] + ": File not found.  Creating a new file."
+  print(sys.argv[1] + ": File not found.  Creating a new file.")
 
 # Add an address.
 PromptForAddress(address_book.people.add())
diff --git a/examples/add_person_test.go b/examples/add_person_test.go
index 0507db6f..f8ba9338 100644
--- a/examples/add_person_test.go
+++ b/examples/add_person_test.go
@@ -30,10 +30,10 @@ unknown
 		t.Errorf("promptForAddress(%q) got %d, want ID %d", in, got.Id, 12345)
 	}
 	if got.Name != "Example Name" {
-		t.Errorf("promptForAddress(%q) => want name %q, got %q", "Example Name", got.Name)
+		t.Errorf("promptForAddress(%q) => want name %q, got %q", in, "Example Name", got.Name)
 	}
 	if got.Email != "name@example.com" {
-		t.Errorf("promptForAddress(%q) => want email %q, got %q", "name@example.com", got.Email)
+		t.Errorf("promptForAddress(%q) => want email %q, got %q", in, "name@example.com", got.Email)
 	}
 
 	want := []*pb.Person_PhoneNumber{
diff --git a/examples/addressbook.proto b/examples/addressbook.proto
index 23cc2f97..b4b33b4c 100644
--- a/examples/addressbook.proto
+++ b/examples/addressbook.proto
@@ -9,6 +9,8 @@
 // [START declaration]
 syntax = "proto3";
 package tutorial;
+
+import "google/protobuf/timestamp.proto";
 // [END declaration]
 
 // [START java_declaration]
@@ -38,6 +40,8 @@ message Person {
   }
 
   repeated PhoneNumber phones = 4;
+
+  google.protobuf.Timestamp last_updated = 5;
 }
 
 // Our address book file is just one of these.
diff --git a/examples/list_people.cc b/examples/list_people.cc
index 68e5666d..b309c596 100644
--- a/examples/list_people.cc
+++ b/examples/list_people.cc
@@ -1,11 +1,16 @@
 // See README.txt for information and build instructions.
 
-#include <iostream>
 #include <fstream>
+#include <google/protobuf/util/time_util.h>
+#include <iostream>
 #include <string>
+
 #include "addressbook.pb.h"
+
 using namespace std;
 
+using google::protobuf::util::TimeUtil;
+
 // Iterates though all people in the AddressBook and prints info about them.
 void ListPeople(const tutorial::AddressBook& address_book) {
   for (int i = 0; i < address_book.people_size(); i++) {
@@ -30,9 +35,15 @@ void ListPeople(const tutorial::AddressBook& address_book) {
         case tutorial::Person::WORK:
           cout << "  Work phone #: ";
           break;
+        default:
+          cout << "  Unknown phone #: ";
+          break;
       }
       cout << phone_number.number() << endl;
     }
+    if (person.has_last_updated()) {
+      cout << "  Updated: " << TimeUtil::ToString(person.last_updated()) << endl;
+    }
   }
 }
 
diff --git a/examples/list_people.py b/examples/list_people.py
index f131872d..d2c294c6 100755
--- a/examples/list_people.py
+++ b/examples/list_people.py
@@ -2,30 +2,33 @@
 
 # See README.txt for information and build instructions.
 
+from __future__ import print_function
 import addressbook_pb2
 import sys
 
+
 # Iterates though all people in the AddressBook and prints info about them.
 def ListPeople(address_book):
   for person in address_book.people:
-    print "Person ID:", person.id
-    print "  Name:", person.name
+    print("Person ID:", person.id)
+    print("  Name:", person.name)
     if person.email != "":
-      print "  E-mail address:", person.email
+      print("  E-mail address:", person.email)
 
     for phone_number in person.phones:
       if phone_number.type == addressbook_pb2.Person.MOBILE:
-        print "  Mobile phone #:",
+        print("  Mobile phone #:", end=" ")
       elif phone_number.type == addressbook_pb2.Person.HOME:
-        print "  Home phone #:",
+        print("  Home phone #:", end=" ")
       elif phone_number.type == addressbook_pb2.Person.WORK:
-        print "  Work phone #:",
-      print phone_number.number
+        print("  Work phone #:", end=" ")
+      print(phone_number.number)
+
 
 # Main procedure:  Reads the entire address book from a file and prints all
 #   the information inside.
 if len(sys.argv) != 2:
-  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
+  print("Usage:", sys.argv[0], "ADDRESS_BOOK_FILE")
   sys.exit(-1)
 
 address_book = addressbook_pb2.AddressBook()
diff --git a/generate_changelog.py b/generate_changelog.py
index d90a9b70..8e5bf423 100755
--- a/generate_changelog.py
+++ b/generate_changelog.py
@@ -20,11 +20,10 @@ languages = [
   ]),
   Language("Java", [
       "java",
-      "javanano",
-      "src/google/protobuf/compiler/cpp",
+      "src/google/protobuf/compiler/java",
   ]),
   Language("Python", [
-      "javanano",
+      "python",
       "src/google/protobuf/compiler/python",
   ]),
   Language("JavaScript", [
diff --git a/generate_descriptor_proto.sh b/generate_descriptor_proto.sh
index 668e6d13..8a5ed48a 100755
--- a/generate_descriptor_proto.sh
+++ b/generate_descriptor_proto.sh
@@ -41,8 +41,24 @@ declare -a RUNTIME_PROTO_FILES=(\
   google/protobuf/type.proto \
   google/protobuf/wrappers.proto)
 
+declare -a COMPILER_PROTO_FILES=(\
+  google/protobuf/compiler/plugin.proto)
+
 CORE_PROTO_IS_CORRECT=0
 PROCESS_ROUND=1
+BOOTSTRAP_PROTOC=""
+while [ $# -gt 0 ]; do
+  case $1 in
+    --bootstrap_protoc)
+      BOOTSTRAP_PROTOC=$2
+      shift
+      ;;
+    *)
+      break
+      ;;
+  esac
+  shift
+done
 TMP=$(mktemp -d)
 echo "Updating descriptor protos..."
 while [ $CORE_PROTO_IS_CORRECT -ne 1 ]
@@ -50,16 +66,22 @@ do
   echo "Round $PROCESS_ROUND"
   CORE_PROTO_IS_CORRECT=1
 
-  make $@ protoc
-  if test $? -ne 0; then
-    echo "Failed to build protoc."
-    exit 1
+  if [ "$BOOTSTRAP_PROTOC" != "" ]; then
+    PROTOC=$BOOTSTRAP_PROTOC
+    BOOTSTRAP_PROTOC=""
+  else
+    make $@ protoc
+    if test $? -ne 0; then
+      echo "Failed to build protoc."
+      exit 1
+    fi
+    PROTOC="./protoc"
   fi
 
-  ./protoc --cpp_out=dllexport_decl=LIBPROTOBUF_EXPORT:$TMP ${RUNTIME_PROTO_FILES[@]} && \
-  ./protoc --cpp_out=dllexport_decl=LIBPROTOC_EXPORT:$TMP google/protobuf/compiler/plugin.proto
+  $PROTOC --cpp_out=dllexport_decl=LIBPROTOBUF_EXPORT:$TMP ${RUNTIME_PROTO_FILES[@]} && \
+  $PROTOC --cpp_out=dllexport_decl=LIBPROTOC_EXPORT:$TMP ${COMPILER_PROTO_FILES[@]}
 
-  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]}; do
+  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]} ${COMPILER_PROTO_FILES[@]}; do
     BASE_NAME=${PROTO_FILE%.*}
     diff ${BASE_NAME}.pb.h $TMP/${BASE_NAME}.pb.h > /dev/null
     if test $? -ne 0; then
@@ -71,24 +93,14 @@ do
     fi
   done
 
-  diff google/protobuf/compiler/plugin.pb.h $TMP/google/protobuf/compiler/plugin.pb.h > /dev/null
-  if test $? -ne 0; then
-    CORE_PROTO_IS_CORRECT=0
-  fi
-  diff google/protobuf/compiler/plugin.pb.cc $TMP/google/protobuf/compiler/plugin.pb.cc > /dev/null
-  if test $? -ne 0; then
-    CORE_PROTO_IS_CORRECT=0
-  fi
-
   # Only override the output if the files are different to avoid re-compilation
   # of the protoc.
   if [ $CORE_PROTO_IS_CORRECT -ne 1 ]; then
-    for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]}; do
+    for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]} ${COMPILER_PROTO_FILES[@]}; do
       BASE_NAME=${PROTO_FILE%.*}
       mv $TMP/${BASE_NAME}.pb.h ${BASE_NAME}.pb.h
       mv $TMP/${BASE_NAME}.pb.cc ${BASE_NAME}.pb.cc
     done
-    mv $TMP/google/protobuf/compiler/plugin.pb.* google/protobuf/compiler/
   fi
 
   PROCESS_ROUND=$((PROCESS_ROUND + 1))
@@ -104,3 +116,8 @@ if test -x csharp/generate_protos.sh; then
   echo "Generating messages for C#."
   csharp/generate_protos.sh $@
 fi
+
+if test -x php/generate_descriptor_protos.sh; then
+  echo "Generating messages for PHP."
+  php/generate_descriptor_protos.sh $@
+fi
diff --git a/gmock.BUILD b/gmock.BUILD
deleted file mode 100644
index b1ae15a9..00000000
--- a/gmock.BUILD
+++ /dev/null
@@ -1,28 +0,0 @@
-cc_library(
-    name = "gtest",
-    srcs = [
-        "googletest/src/gtest-all.cc",
-        "googlemock/src/gmock-all.cc",
-    ],
-    hdrs = glob([
-        "**/*.h",
-        "googletest/src/*.cc",
-        "googlemock/src/*.cc",
-    ]),
-    includes = [
-        "googlemock",
-        "googletest",
-        "googletest/include",
-        "googlemock/include",
-    ],
-    linkopts = ["-pthread"],
-    visibility = ["//visibility:public"],
-)
-
-cc_library(
-    name = "gtest_main",
-    srcs = ["googlemock/src/gmock_main.cc"],
-    linkopts = ["-pthread"],
-    visibility = ["//visibility:public"],
-    deps = [":gtest"],
-)
diff --git a/java/README.md b/java/README.md
index 0e0fba64..5e4fb8b4 100644
--- a/java/README.md
+++ b/java/README.md
@@ -1,17 +1,65 @@
-Protocol Buffers - Google's data interchange format
-===================================================
-
-[![Build Status](https://travis-ci.org/google/protobuf.svg?branch=master)](https://travis-ci.org/google/protobuf)
+# Protocol Buffers - Google's data interchange format
 
 Copyright 2008 Google Inc.
 
-This directory contains the Java Protocol Buffers runtime library.
+https://developers.google.com/protocol-buffers/
+
+## Use Java Protocol Buffers
+
+To use protobuf in Java, first obtain the protocol compiler (a.k.a., protoc,
+see instructions in the toplevel [README.md](../README.md)) and use it to
+generate Java code for your .proto files:
+
+    $ protoc --java_out=${OUTPUT_DIR} path/to/your/proto/file
+
+Include the generated Java files in your project and add a dependency on the
+protobuf Java runtime. If you are using Maven, use the following:
+
+```xml
+<dependency>
+  <groupId>com.google.protobuf</groupId>
+  <artifactId>protobuf-java</artifactId>
+  <version>3.5.1</version>
+</dependency>
+```
+
+Make sure the version number of the runtime matches (or is newer than) the
+version number of the protoc.
+
+If you want to use features like protobuf JsonFormat, add a dependency on the
+protobuf-java-util package:
+
+```xml
+<dependency>
+  <groupId>com.google.protobuf</groupId>
+  <artifactId>protobuf-java-util</artifactId>
+  <version>3.5.1</version>
+</dependency>
+```
+
+### Use Java Protocol Buffers on Android
+
+For Android users, it's recommended to use protobuf Java Lite runtime because
+of its smaller code size. Java Lite runtime also works better with Proguard
+because it doesn't rely on Java reflection and is optimized to allow as much
+code stripping as possible. You can following these [instructions to use Java
+Lite runtime](lite.md).
+
+### Use Java Protocol Buffers with Bazel
+
+Bazel has native build rules to work with protobuf. For Java, you can use the
+`java_proto_library` rule for server and the `java_lite_proto_library` rule
+for Android. Check out [our build files examples](../examples/BUILD) to learn
+how to use them.
+
+## Build from Source
 
-Installation - With Maven
-=========================
+Most users should follow the instructions above to use protobuf Java runtime.
+If you are contributing code to protobuf or want to use a protobuf version
+that hasn't been officially released yet, you can folllow the instructions
+below to build protobuf from source code.
 
-The Protocol Buffers build is managed using Maven.  If you would
-rather build without Maven, see below.
+### Build from Source - With Maven
 
 1) Install Apache Maven if you don't have it:
 
@@ -45,20 +93,15 @@ rather build without Maven, see below.
 
    The .jar will be placed in the "target" directory.
 
-The above instructions will install 3 maven artifacts:
+The above instructions will install 2 maven artifacts:
 
   * protobuf-java: The core Java Protocol Buffers library. Most users only
                    need this artifact.
-  * protobuf-lite: The lite version of core Java Protobuf Buffers library. It
-                   is a subset of the core library and is used together with
-                   the 'lite' code generator flag to reduce generated code size
-                   for mobile.
   * protobuf-java-util: Utilities to work with protos. It contains JSON support
                         as well as utilities to work with proto3 well-known
                         types.
 
-Installation - Without Maven
-============================
+### Build from Source - Without Maven
 
 If you would rather not install Maven to build the library, you may
 follow these instructions instead.  Note that these instructions skip
@@ -83,8 +126,7 @@ library (without the util package).
 
 4) Install the classes wherever you prefer.
 
-Compatibility Notice
-====================
+## Compatibility Notice
 
 * Protobuf minor version releases are backwards-compatible. If your code
   can build/run against the old version, it's expected to build/run against
@@ -118,8 +160,7 @@ Compatibility Notice
 * Protobuf LITE runtime APIs are not stable yet. They are subject to change even
   in minor version releases.
 
-Documentation
-=============
+## Documentation
 
 The complete documentation for Protocol Buffers is available via the
 web at:
diff --git a/java/core/generate-test-sources-build.xml b/java/core/generate-test-sources-build.xml
index ab415db6..1d11f131 100644
--- a/java/core/generate-test-sources-build.xml
+++ b/java/core/generate-test-sources-build.xml
@@ -5,6 +5,7 @@
         <arg value="--proto_path=${protobuf.source.dir}"/>
         <arg value="--proto_path=${test.proto.dir}"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest.proto"/>
+        <arg value="${protobuf.source.dir}/google/protobuf/unittest_proto3.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_import.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_import_public.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_mset.proto"/>
@@ -18,6 +19,7 @@
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_enormous_descriptor.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_no_generic_services.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_well_known_types.proto"/>
+        <arg value="${test.proto.dir}/com/google/protobuf/deprecated_file.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/lazy_fields_lite.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/lite_equals_and_hash.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/multiple_files_test.proto"/>
@@ -37,7 +39,8 @@
         <arg value="${test.proto.dir}/com/google/protobuf/field_presence_test.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/map_for_proto2_lite_test.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/map_for_proto2_test.proto"/>
+        <arg value="${test.proto.dir}/com/google/protobuf/map_lite_test.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/map_test.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/map_initialization_order_test.proto"/>
     </exec>
-</project>
\ No newline at end of file
+</project>
diff --git a/java/core/pom.xml b/java/core/pom.xml
index 07bcfa46..5b0b9520 100644
--- a/java/core/pom.xml
+++ b/java/core/pom.xml
@@ -6,7 +6,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.2.0</version>
+    <version>3.5.2</version>
   </parent>
 
   <artifactId>protobuf-java</artifactId>
@@ -22,14 +22,17 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.easymock</groupId>
       <artifactId>easymock</artifactId>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.easymock</groupId>
       <artifactId>easymockclassextension</artifactId>
+      <scope>test</scope>
     </dependency>
   </dependencies>
 
diff --git a/java/core/src/main/java/com/google/protobuf/AbstractMessage.java b/java/core/src/main/java/com/google/protobuf/AbstractMessage.java
index 37180da8..fc3c2a5d 100644
--- a/java/core/src/main/java/com/google/protobuf/AbstractMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractMessage.java
@@ -32,9 +32,9 @@ package com.google.protobuf;
 
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
+import com.google.protobuf.Descriptors.FileDescriptor.Syntax;
 import com.google.protobuf.Descriptors.OneofDescriptor;
 import com.google.protobuf.Internal.EnumLite;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Arrays;
@@ -125,6 +125,16 @@ public abstract class AbstractMessage
   protected int memoizedSize = -1;
 
   @Override
+  int getMemoizedSerializedSize() {
+    return memoizedSize;
+  }
+
+  @Override
+  void setMemoizedSerializedSize(int size) {
+    memoizedSize = size;
+  }
+
+  @Override
   public int getSerializedSize() {
     int size = memoizedSize;
     if (size != -1) {
@@ -163,7 +173,7 @@ public abstract class AbstractMessage
     }
     return hash;
   }
-  
+
   private static ByteString toByteString(Object value) {
     if (value instanceof byte[]) {
       return ByteString.copyFrom((byte[]) value);
@@ -171,7 +181,7 @@ public abstract class AbstractMessage
       return (ByteString) value;
     }
   }
- 
+
   /**
    * Compares two bytes fields. The parameters must be either a byte array or a
    * ByteString object. They can be of different type though.
@@ -182,7 +192,7 @@ public abstract class AbstractMessage
     }
     return toByteString(a).equals(toByteString(b));
   }
-  
+
   /**
    * Converts a list of MapEntry messages into a Map used for equals() and
    * hashCode().
@@ -213,7 +223,7 @@ public abstract class AbstractMessage
     }
     return result;
   }
-  
+
   /**
    * Compares two map fields. The parameters must be a list of MapEntry
    * messages.
@@ -224,13 +234,13 @@ public abstract class AbstractMessage
     Map mb = convertMapEntryListToMap((List) b);
     return MapFieldLite.equals(ma, mb);
   }
-  
+
   /**
    * Compares two set of fields.
    * This method is used to implement {@link AbstractMessage#equals(Object)}
    * and {@link AbstractMutableMessage#equals(Object)}. It takes special care
    * of bytes fields because immutable messages and mutable messages use
-   * different Java type to reprensent a bytes field and this method should be
+   * different Java type to represent a bytes field and this method should be
    * able to compare immutable messages, mutable messages and also an immutable
    * message to a mutable message.
    */
@@ -276,7 +286,7 @@ public abstract class AbstractMessage
     }
     return true;
   }
-  
+
   /**
    * Calculates the hash code of a map field. {@code value} must be a list of
    * MapEntry messages.
@@ -328,7 +338,8 @@ public abstract class AbstractMessage
       extends AbstractMessageLite.Builder
       implements Message.Builder {
     // The compiler produces an error if this is not declared explicitly.
-    // Method isn't abstract to bypass Java 1.6 compiler issue http://bugs.java.com/view_bug.do?bug_id=6908259
+    // Method isn't abstract to bypass Java 1.6 compiler issue:
+    //     http://bugs.java.com/view_bug.do?bug_id=6908259
     @Override
     public BuilderType clone() {
       throw new UnsupportedOperationException("clone() should be implemented in subclasses.");
@@ -371,7 +382,7 @@ public abstract class AbstractMessage
     public String getInitializationErrorString() {
       return MessageReflection.delimitWithCommas(findInitializationErrors());
     }
-    
+
     @Override
     protected BuilderType internalMergeFrom(AbstractMessageLite other) {
       return mergeFrom((Message) other);
@@ -379,6 +390,10 @@ public abstract class AbstractMessage
 
     @Override
     public BuilderType mergeFrom(final Message other) {
+      return mergeFrom(other, other.getAllFields());
+    }
+    
+    BuilderType mergeFrom(final Message other, Map<FieldDescriptor, Object> allFields) {
       if (other.getDescriptorForType() != getDescriptorForType()) {
         throw new IllegalArgumentException(
           "mergeFrom(Message) can only merge messages of the same type.");
@@ -393,8 +408,7 @@ public abstract class AbstractMessage
       // TODO(kenton):  Provide a function somewhere called makeDeepCopy()
       //   which allows people to make secure deep copies of messages.
 
-      for (final Map.Entry<FieldDescriptor, Object> entry :
-           other.getAllFields().entrySet()) {
+      for (final Map.Entry<FieldDescriptor, Object> entry : allFields.entrySet()) {
         final FieldDescriptor field = entry.getKey();
         if (field.isRepeated()) {
           for (final Object element : (List)entry.getValue()) {
@@ -432,8 +446,12 @@ public abstract class AbstractMessage
         final CodedInputStream input,
         final ExtensionRegistryLite extensionRegistry)
         throws IOException {
+      boolean discardUnknown =
+          getDescriptorForType().getFile().getSyntax() == Syntax.PROTO3
+              ? input.shouldDiscardUnknownFieldsProto3()
+              : input.shouldDiscardUnknownFields();
       final UnknownFieldSet.Builder unknownFields =
-        UnknownFieldSet.newBuilder(getUnknownFields());
+          discardUnknown ? null : UnknownFieldSet.newBuilder(getUnknownFields());
       while (true) {
         final int tag = input.readTag();
         if (tag == 0) {
@@ -451,7 +469,9 @@ public abstract class AbstractMessage
           break;
         }
       }
-      setUnknownFields(unknownFields.build());
+      if (unknownFields != null) {
+        setUnknownFields(unknownFields.build());
+      }
       return (BuilderType) this;
     }
 
diff --git a/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java b/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java
index 4f691dfd..b22bbaab 100644
--- a/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractMessageLite.java
@@ -30,11 +30,15 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
 /**
  * A partial implementation of the {@link MessageLite} interface which
@@ -95,6 +99,16 @@ public abstract class AbstractMessageLite<
     codedOutput.flush();
   }
 
+  // We'd like these to be abstract but some folks are extending this class directly. They shouldn't
+  // be doing that and they should feel bad.
+  int getMemoizedSerializedSize() {
+    throw new UnsupportedOperationException();
+  }
+
+  void setMemoizedSerializedSize(int size) {
+    throw new UnsupportedOperationException();
+  }
+
 
   /**
    * Package private helper method for AbstractParser to create
@@ -116,8 +130,13 @@ public abstract class AbstractMessageLite<
     }
   }
 
-  protected static <T> void addAll(final Iterable<T> values,
-      final Collection<? super T> list) {
+  // For binary compatibility
+  @Deprecated
+  protected static <T> void addAll(final Iterable<T> values, final Collection<? super T> list) {
+    Builder.addAll(values, (List) list);
+  }
+
+  protected static <T> void addAll(final Iterable<T> values, final List<? super T> list) {
     Builder.addAll(values, list);
   }
 
@@ -332,6 +351,25 @@ public abstract class AbstractMessageLite<
           + " threw an IOException (should never happen).";
     }
 
+    // We check nulls as we iterate to avoid iterating over values twice.
+    private static <T> void addAllCheckingNulls(Iterable<T> values, List<? super T> list) {
+      if (list instanceof ArrayList && values instanceof Collection) {
+        ((ArrayList<T>) list).ensureCapacity(list.size() + ((Collection<T>) values).size());
+      }
+      int begin = list.size();
+      for (T value : values) {
+        if (value == null) {
+          // encountered a null value so we must undo our modifications prior to throwing
+          String message = "Element at index " + (list.size() - begin) + " is null.";
+          for (int i = list.size() - 1; i >= begin; i--) {
+            list.remove(i);
+          }
+          throw new NullPointerException(message);
+        }
+        list.add(value);
+      }
+    }
+
     /**
      * Construct an UninitializedMessageException reporting missing fields in
      * the given message.
@@ -341,41 +379,50 @@ public abstract class AbstractMessageLite<
       return new UninitializedMessageException(message);
     }
 
+    // For binary compatibility.
+    @Deprecated
+    protected static <T> void addAll(final Iterable<T> values, final Collection<? super T> list) {
+      addAll(values, (List<T>) list);
+    }
+
     /**
-     * Adds the {@code values} to the {@code list}.  This is a helper method
-     * used by generated code.  Users should ignore it.
+     * Adds the {@code values} to the {@code list}. This is a helper method used by generated code.
+     * Users should ignore it.
      *
-     * @throws NullPointerException if {@code values} or any of the elements of
-     * {@code values} is null. When that happens, some elements of
-     * {@code values} may have already been added to the result {@code list}.
+     * @throws NullPointerException if {@code values} or any of the elements of {@code values} is
+     *     null.
      */
-    protected static <T> void addAll(final Iterable<T> values,
-                                     final Collection<? super T> list) {
-      if (values == null) {
-        throw new NullPointerException();
-      }
+    protected static <T> void addAll(final Iterable<T> values, final List<? super T> list) {
+      checkNotNull(values);
       if (values instanceof LazyStringList) {
         // For StringOrByteStringLists, check the underlying elements to avoid
         // forcing conversions of ByteStrings to Strings.
-        checkForNullValues(((LazyStringList) values).getUnderlyingElements());
-        list.addAll((Collection<T>) values);
-      } else if (values instanceof Collection) {
-        checkForNullValues(values);
-        list.addAll((Collection<T>) values);
-      } else {
-        for (final T value : values) {
+        // TODO(dweis): Could we just prohibit nulls in all protobuf lists and get rid of this? Is
+        // if even possible to hit this condition as all protobuf methods check for null first,
+        // right?
+        List<?> lazyValues = ((LazyStringList) values).getUnderlyingElements();
+        LazyStringList lazyList = (LazyStringList) list;
+        int begin = list.size();
+        for (Object value : lazyValues) {
           if (value == null) {
-            throw new NullPointerException();
+            // encountered a null value so we must undo our modifications prior to throwing
+            String message = "Element at index " + (lazyList.size() - begin) + " is null.";
+            for (int i = lazyList.size() - 1; i >= begin; i--) {
+              lazyList.remove(i);
+            }
+            throw new NullPointerException(message);
+          }
+          if (value instanceof ByteString) {
+            lazyList.add((ByteString) value);
+          } else {
+            lazyList.add((String) value);
           }
-          list.add(value);
         }
-      }
-    }
-
-    private static void checkForNullValues(final Iterable<?> values) {
-      for (final Object value : values) {
-        if (value == null) {
-          throw new NullPointerException();
+      } else {
+        if (values instanceof PrimitiveNonBoxingCollection) {
+          list.addAll((Collection<T>) values);
+        } else {
+          addAllCheckingNulls(values, list);
         }
       }
     }
diff --git a/java/core/src/main/java/com/google/protobuf/AbstractParser.java b/java/core/src/main/java/com/google/protobuf/AbstractParser.java
index 7ff73ba4..ba570e3d 100644
--- a/java/core/src/main/java/com/google/protobuf/AbstractParser.java
+++ b/java/core/src/main/java/com/google/protobuf/AbstractParser.java
@@ -31,9 +31,9 @@
 package com.google.protobuf;
 
 import com.google.protobuf.AbstractMessageLite.Builder.LimitedInputStream;
-
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.ByteBuffer;
 
 /**
  * A partial implementation of the {@link Parser} interface which implements
@@ -131,6 +131,30 @@ public abstract class AbstractParser<MessageType extends MessageLite>
   }
 
   @Override
+  public MessageType parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)
+      throws InvalidProtocolBufferException {
+    MessageType message;
+    try {
+      CodedInputStream input = CodedInputStream.newInstance(data);
+      message = parsePartialFrom(input, extensionRegistry);
+      try {
+        input.checkLastTagWas(0);
+      } catch (InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(message);
+      }
+    } catch (InvalidProtocolBufferException e) {
+      throw e;
+    }
+
+    return checkMessageInitialized(message);
+  }
+
+  @Override
+  public MessageType parseFrom(ByteBuffer data) throws InvalidProtocolBufferException {
+    return parseFrom(data, EMPTY_REGISTRY);
+  }
+
+  @Override
   public MessageType parsePartialFrom(
       byte[] data, int off, int len, ExtensionRegistryLite extensionRegistry)
       throws InvalidProtocolBufferException {
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto b/java/core/src/main/java/com/google/protobuf/Android.java
index 25786cc2..cad54783 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto
+++ b/java/core/src/main/java/com/google/protobuf/Android.java
@@ -28,27 +28,30 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: wink@google.com (Wink Saville)
-//
+package com.google.protobuf;
 
-package protobuf_unittest_import;
+final class Android {
 
-option java_package = "com.google.protobuf";
-// Explicit outer classname to suppress legacy info.
-option java_outer_classname = "UnittestSimpleNano";
+  private static final Class<?> MEMORY_CLASS = getClassForName("libcore.io.Memory");
+  private static final boolean IS_ROBOLECTRIC =
+      getClassForName("org.robolectric.Robolectric") != null;
 
-message SimpleMessageNano {
-  message NestedMessage {
-    optional int32 bb = 1;
+  /** Returns {@code true} if running on an Android device. */
+  static boolean isOnAndroidDevice() {
+    return MEMORY_CLASS != null && !IS_ROBOLECTRIC;
   }
 
-  enum NestedEnum {
-    FOO = 1;
-    BAR = 2;
-    BAZ = 3;
+  /** Returns the memory class or {@code null} if not on Android device. */
+  static Class<?> getMemoryClass() {
+    return MEMORY_CLASS;
   }
 
-  optional int32 d = 1 [default = 123];
-  optional NestedMessage nested_msg = 2;
-  optional NestedEnum default_nested_enum = 3 [default = BAZ];
+  @SuppressWarnings("unchecked")
+  private static <T> Class<T> getClassForName(String name) {
+    try {
+      return (Class<T>) Class.forName(name);
+    } catch (Throwable e) {
+      return null;
+    }
+  }
 }
diff --git a/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java b/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java
index 0d9f87ba..4d7a9727 100644
--- a/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/BooleanArrayList.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.BooleanList;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.BooleanList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.RandomAccess;
@@ -41,9 +42,8 @@ import java.util.RandomAccess;
  *
  * @author dweis@google.com (Daniel Weis)
  */
-final class BooleanArrayList
-    extends AbstractProtobufList<Boolean>
-    implements BooleanList, RandomAccess {
+final class BooleanArrayList extends AbstractProtobufList<Boolean>
+    implements BooleanList, RandomAccess, PrimitiveNonBoxingCollection {
 
   private static final BooleanArrayList EMPTY_LIST = new BooleanArrayList();
   static {
@@ -82,6 +82,18 @@ final class BooleanArrayList
   }
 
   @Override
+  protected void removeRange(int fromIndex, int toIndex) {
+    ensureIsMutable();
+    if (toIndex < fromIndex) {
+      throw new IndexOutOfBoundsException("toIndex < fromIndex");
+    }
+
+    System.arraycopy(array, toIndex, array, fromIndex, size - toIndex);
+    size -= (toIndex - fromIndex);
+    modCount++;
+  }
+
+  @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
@@ -198,9 +210,7 @@ final class BooleanArrayList
   public boolean addAll(Collection<? extends Boolean> collection) {
     ensureIsMutable();
 
-    if (collection == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(collection);
 
     // We specialize when adding another BooleanArrayList to avoid boxing elements.
     if (!(collection instanceof BooleanArrayList)) {
@@ -248,7 +258,9 @@ final class BooleanArrayList
     ensureIsMutable();
     ensureIndexInRange(index);
     boolean value = array[index];
-    System.arraycopy(array, index + 1, array, index, size - index);
+    if (index < size - 1) {
+      System.arraycopy(array, index + 1, array, index, size - index);
+    }
     size--;
     modCount++;
     return value;
diff --git a/java/core/src/main/java/com/google/protobuf/ByteString.java b/java/core/src/main/java/com/google/protobuf/ByteString.java
index 99a31209..d67bb54a 100644
--- a/java/core/src/main/java/com/google/protobuf/ByteString.java
+++ b/java/core/src/main/java/com/google/protobuf/ByteString.java
@@ -124,14 +124,8 @@ public abstract class ByteString implements Iterable<Byte>, Serializable {
 
   private static final ByteArrayCopier byteArrayCopier;
   static {
-    boolean isAndroid = true;
-    try {
-      Class.forName("android.content.Context");
-    } catch (ClassNotFoundException e) {
-      isAndroid = false;
-    }
-
-    byteArrayCopier = isAndroid ? new SystemByteArrayCopier() : new ArraysByteArrayCopier();
+    byteArrayCopier =
+        Android.isOnAndroidDevice() ? new SystemByteArrayCopier() : new ArraysByteArrayCopier();
   }
 
   /**
diff --git a/java/core/src/main/java/com/google/protobuf/CodedInputStream.java b/java/core/src/main/java/com/google/protobuf/CodedInputStream.java
index 14169dc4..1297462e 100644
--- a/java/core/src/main/java/com/google/protobuf/CodedInputStream.java
+++ b/java/core/src/main/java/com/google/protobuf/CodedInputStream.java
@@ -34,8 +34,8 @@ import static com.google.protobuf.Internal.EMPTY_BYTE_ARRAY;
 import static com.google.protobuf.Internal.EMPTY_BYTE_BUFFER;
 import static com.google.protobuf.Internal.UTF_8;
 import static com.google.protobuf.Internal.checkNotNull;
-import static com.google.protobuf.WireFormat.FIXED_32_SIZE;
-import static com.google.protobuf.WireFormat.FIXED_64_SIZE;
+import static com.google.protobuf.WireFormat.FIXED32_SIZE;
+import static com.google.protobuf.WireFormat.FIXED64_SIZE;
 import static com.google.protobuf.WireFormat.MAX_VARINT_SIZE;
 
 import java.io.ByteArrayOutputStream;
@@ -44,6 +44,7 @@ import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Iterator;
 import java.util.List;
 
 /**
@@ -63,6 +64,12 @@ public abstract class CodedInputStream {
   // Integer.MAX_VALUE == 0x7FFFFFF == INT_MAX from limits.h
   private static final int DEFAULT_SIZE_LIMIT = Integer.MAX_VALUE;
 
+  /**
+   * Whether to enable our custom UTF-8 decode codepath which does not use {@link StringCoding}.
+   * Currently disabled.
+   */
+  private static final boolean ENABLE_CUSTOM_UTF8_DECODE = false;
+
   /** Visible for subclasses. See setRecursionLimit() */
   int recursionDepth;
 
@@ -85,6 +92,43 @@ public abstract class CodedInputStream {
     return new StreamDecoder(input, bufferSize);
   }
 
+  /** Create a new CodedInputStream wrapping the given {@code Iterable <ByteBuffer>}. */
+  public static CodedInputStream newInstance(final Iterable<ByteBuffer> input) {
+    if (!UnsafeDirectNioDecoder.isSupported()) {
+      return newInstance(new IterableByteBufferInputStream(input));
+    }
+    return newInstance(input, false);
+  }
+
+  /** Create a new CodedInputStream wrapping the given {@code Iterable <ByteBuffer>}. */
+  static CodedInputStream newInstance(
+      final Iterable<ByteBuffer> bufs, final boolean bufferIsImmutable) {
+    // flag is to check the type of input's ByteBuffers.
+    // flag equals 1: all ByteBuffers have array.
+    // flag equals 2: all ByteBuffers are direct ByteBuffers.
+    // flag equals 3: some ByteBuffers are direct and some have array.
+    // flag greater than 3: other cases.
+    int flag = 0;
+    // Total size of the input
+    int totalSize = 0;
+    for (ByteBuffer buf : bufs) {
+      totalSize += buf.remaining();
+      if (buf.hasArray()) {
+        flag |= 1;
+      } else if (buf.isDirect()) {
+        flag |= 2;
+      } else {
+        flag |= 4;
+      }
+    }
+    if (flag == 2) {
+      return new IterableDirectByteBufferDecoder(bufs, totalSize, bufferIsImmutable);
+    } else {
+      // TODO(yilunchong): add another decoders to deal case 1 and 3.
+      return newInstance(new IterableByteBufferInputStream(bufs));
+    }
+  }
+
   /** Create a new CodedInputStream wrapping the given byte array. */
   public static CodedInputStream newInstance(final byte[] buf) {
     return newInstance(buf, 0, buf.length);
@@ -354,9 +398,9 @@ public abstract class CodedInputStream {
    *
    * <p>Set the maximum message size. In order to prevent malicious messages from exhausting memory
    * or causing integer overflows, {@code CodedInputStream} limits how large a message may be. The
-   * default limit is 64MB. You should set this limit as small as you can without harming your app's
-   * functionality. Note that size limits only apply when reading from an {@code InputStream}, not
-   * when constructed around a raw byte array (nor with {@link ByteString#newCodedInput}).
+   * default limit is {@code Integer.MAX_INT}. You should set this limit as small as you can without
+   * harming your app's functionality. Note that size limits only apply when reading from an {@code
+   * InputStream}, not when constructed around a raw byte array.
    *
    * <p>If you want to read several messages from a single CodedInputStream, you could call {@link
    * #resetSizeCounter()} after each one to avoid hitting the size limit.
@@ -372,6 +416,63 @@ public abstract class CodedInputStream {
     return oldLimit;
   }
 
+
+  private boolean explicitDiscardUnknownFields = false;
+
+  private static volatile boolean proto3DiscardUnknownFieldsDefault = false;
+
+  static void setProto3DiscardUnknownsByDefaultForTest() {
+    proto3DiscardUnknownFieldsDefault = true;
+  }
+
+  static void setProto3KeepUnknownsByDefaultForTest() {
+    proto3DiscardUnknownFieldsDefault = false;
+  }
+
+  static boolean getProto3DiscardUnknownFieldsDefault() {
+    return proto3DiscardUnknownFieldsDefault;
+  }
+
+  /**
+   * Sets this {@code CodedInputStream} to discard unknown fields. Only applies to full runtime
+   * messages; lite messages will always preserve unknowns.
+   *
+   * <p>Note calling this function alone will have NO immediate effect on the underlying input data.
+   * The unknown fields will be discarded during parsing. This affects both Proto2 and Proto3 full
+   * runtime.
+   */
+  final void discardUnknownFields() {
+    explicitDiscardUnknownFields = true;
+  }
+
+  /**
+   * Reverts the unknown fields preservation behavior for Proto2 and Proto3 full runtime to their
+   * default.
+   */
+  final void unsetDiscardUnknownFields() {
+    explicitDiscardUnknownFields = false;
+  }
+
+  /**
+   * Whether unknown fields in this input stream should be discarded during parsing into full
+   * runtime messages.
+   */
+  final boolean shouldDiscardUnknownFields() {
+    return explicitDiscardUnknownFields;
+  }
+
+  /**
+   * Whether unknown fields in this input stream should be discarded during parsing for proto3 full
+   * runtime messages.
+   *
+   * <p>This function was temporarily introduced before proto3 unknown fields behavior is changed.
+   * TODO(liujisi): remove this and related code in GeneratedMessage after proto3 unknown
+   * fields migration is done.
+   */
+  final boolean shouldDiscardUnknownFieldsProto3() {
+    return explicitDiscardUnknownFields ? true : proto3DiscardUnknownFieldsDefault;
+  }
+
   /**
    * Resets the current size counter to zero (see {@link #setSizeLimit(int)}). Only valid for {@link
    * InputStream}-backed streams.
@@ -572,7 +673,7 @@ public abstract class CodedInputStream {
           skipRawVarint();
           return true;
         case WireFormat.WIRETYPE_FIXED64:
-          skipRawBytes(FIXED_64_SIZE);
+          skipRawBytes(FIXED64_SIZE);
           return true;
         case WireFormat.WIRETYPE_LENGTH_DELIMITED:
           skipRawBytes(readRawVarint32());
@@ -585,7 +686,7 @@ public abstract class CodedInputStream {
         case WireFormat.WIRETYPE_END_GROUP:
           return false;
         case WireFormat.WIRETYPE_FIXED32:
-          skipRawBytes(FIXED_32_SIZE);
+          skipRawBytes(FIXED32_SIZE);
           return true;
         default:
           throw InvalidProtocolBufferException.invalidWireType();
@@ -730,13 +831,19 @@ public abstract class CodedInputStream {
     public String readStringRequireUtf8() throws IOException {
       final int size = readRawVarint32();
       if (size > 0 && size <= (limit - pos)) {
-        // TODO(martinrb): We could save a pass by validating while decoding.
-        if (!Utf8.isValidUtf8(buffer, pos, pos + size)) {
-          throw InvalidProtocolBufferException.invalidUtf8();
+        if (ENABLE_CUSTOM_UTF8_DECODE) {
+          String result = Utf8.decodeUtf8(buffer, pos, size);
+          pos += size;
+          return result;
+        } else {
+          // TODO(martinrb): We could save a pass by validating while decoding.
+          if (!Utf8.isValidUtf8(buffer, pos, pos + size)) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          final int tempPos = pos;
+          pos += size;
+          return new String(buffer, tempPos, size, UTF_8);
         }
-        final int tempPos = pos;
-        pos += size;
-        return new String(buffer, tempPos, size, UTF_8);
       }
 
       if (size == 0) {
@@ -1064,12 +1171,12 @@ public abstract class CodedInputStream {
     public int readRawLittleEndian32() throws IOException {
       int tempPos = pos;
 
-      if (limit - tempPos < FIXED_32_SIZE) {
+      if (limit - tempPos < FIXED32_SIZE) {
         throw InvalidProtocolBufferException.truncatedMessage();
       }
 
       final byte[] buffer = this.buffer;
-      pos = tempPos + FIXED_32_SIZE;
+      pos = tempPos + FIXED32_SIZE;
       return (((buffer[tempPos] & 0xff))
           | ((buffer[tempPos + 1] & 0xff) << 8)
           | ((buffer[tempPos + 2] & 0xff) << 16)
@@ -1080,12 +1187,12 @@ public abstract class CodedInputStream {
     public long readRawLittleEndian64() throws IOException {
       int tempPos = pos;
 
-      if (limit - tempPos < FIXED_64_SIZE) {
+      if (limit - tempPos < FIXED64_SIZE) {
         throw InvalidProtocolBufferException.truncatedMessage();
       }
 
       final byte[] buffer = this.buffer;
-      pos = tempPos + FIXED_64_SIZE;
+      pos = tempPos + FIXED64_SIZE;
       return (((buffer[tempPos] & 0xffL))
           | ((buffer[tempPos + 1] & 0xffL) << 8)
           | ((buffer[tempPos + 2] & 0xffL) << 16)
@@ -1290,7 +1397,7 @@ public abstract class CodedInputStream {
           skipRawVarint();
           return true;
         case WireFormat.WIRETYPE_FIXED64:
-          skipRawBytes(FIXED_64_SIZE);
+          skipRawBytes(FIXED64_SIZE);
           return true;
         case WireFormat.WIRETYPE_LENGTH_DELIMITED:
           skipRawBytes(readRawVarint32());
@@ -1303,7 +1410,7 @@ public abstract class CodedInputStream {
         case WireFormat.WIRETYPE_END_GROUP:
           return false;
         case WireFormat.WIRETYPE_FIXED32:
-          skipRawBytes(FIXED_32_SIZE);
+          skipRawBytes(FIXED32_SIZE);
           return true;
         default:
           throw InvalidProtocolBufferException.invalidWireType();
@@ -1429,7 +1536,11 @@ public abstract class CodedInputStream {
       final int size = readRawVarint32();
       if (size > 0 && size <= remaining()) {
         // TODO(nathanmittler): Is there a way to avoid this copy?
-        byte[] bytes = copyToArray(pos, pos + size);
+        // TODO(anuraaga): It might be possible to share the optimized loop with
+        // readStringRequireUtf8 by implementing Java replacement logic there.
+        // The same as readBytes' logic
+        byte[] bytes = new byte[size];
+        UnsafeUtil.copyMemory(pos, bytes, 0, size);
         String result = new String(bytes, UTF_8);
         pos += size;
         return result;
@@ -1447,17 +1558,26 @@ public abstract class CodedInputStream {
     @Override
     public String readStringRequireUtf8() throws IOException {
       final int size = readRawVarint32();
-      if (size >= 0 && size <= remaining()) {
-        // TODO(nathanmittler): Is there a way to avoid this copy?
-        byte[] bytes = copyToArray(pos, pos + size);
-        // TODO(martinrb): We could save a pass by validating while decoding.
-        if (!Utf8.isValidUtf8(bytes)) {
-          throw InvalidProtocolBufferException.invalidUtf8();
-        }
+      if (size > 0 && size <= remaining()) {
+        if (ENABLE_CUSTOM_UTF8_DECODE) {
+          final int bufferPos = bufferPos(pos);
+          String result = Utf8.decodeUtf8(buffer, bufferPos, size);
+          pos += size;
+          return result;
+        } else {
+          // TODO(nathanmittler): Is there a way to avoid this copy?
+          // The same as readBytes' logic
+          byte[] bytes = new byte[size];
+          UnsafeUtil.copyMemory(pos, bytes, 0, size);
+          // TODO(martinrb): We could save a pass by validating while decoding.
+          if (!Utf8.isValidUtf8(bytes)) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
 
-        String result = new String(bytes, UTF_8);
-        pos += size;
-        return result;
+          String result = new String(bytes, UTF_8);
+          pos += size;
+          return result;
+        }
       }
 
       if (size == 0) {
@@ -1545,14 +1665,17 @@ public abstract class CodedInputStream {
     public ByteString readBytes() throws IOException {
       final int size = readRawVarint32();
       if (size > 0 && size <= remaining()) {
-        ByteBuffer result;
         if (immutable && enableAliasing) {
-          result = slice(pos, pos + size);
+          final ByteBuffer result = slice(pos, pos + size);
+          pos += size;
+          return ByteString.wrap(result);
         } else {
-          result = copy(pos, pos + size);
+          // Use UnsafeUtil to copy the memory to bytes instead of using ByteBuffer ways.
+          byte[] bytes = new byte[size];
+          UnsafeUtil.copyMemory(pos, bytes, 0, size);
+          pos += size;
+          return ByteString.wrap(bytes);
         }
-        pos += size;
-        return ByteString.wrap(result);
       }
 
       if (size == 0) {
@@ -1573,18 +1696,21 @@ public abstract class CodedInputStream {
     public ByteBuffer readByteBuffer() throws IOException {
       final int size = readRawVarint32();
       if (size > 0 && size <= remaining()) {
-        ByteBuffer result;
         // "Immutable" implies that buffer is backing a ByteString.
         // Disallow slicing in this case to prevent the caller from modifying the contents
         // of the ByteString.
         if (!immutable && enableAliasing) {
-          result = slice(pos, pos + size);
+          final ByteBuffer result = slice(pos, pos + size);
+          pos += size;
+          return result;
         } else {
-          result = copy(pos, pos + size);
+          // The same as readBytes' logic
+          byte[] bytes = new byte[size];
+          UnsafeUtil.copyMemory(pos, bytes, 0, size);
+          pos += size;
+          return ByteBuffer.wrap(bytes);
         }
-        pos += size;
         // TODO(nathanmittler): Investigate making the ByteBuffer be made read-only
-        return result;
       }
 
       if (size == 0) {
@@ -1785,11 +1911,11 @@ public abstract class CodedInputStream {
     public int readRawLittleEndian32() throws IOException {
       long tempPos = pos;
 
-      if (limit - tempPos < FIXED_32_SIZE) {
+      if (limit - tempPos < FIXED32_SIZE) {
         throw InvalidProtocolBufferException.truncatedMessage();
       }
 
-      pos = tempPos + FIXED_32_SIZE;
+      pos = tempPos + FIXED32_SIZE;
       return (((UnsafeUtil.getByte(tempPos) & 0xff))
           | ((UnsafeUtil.getByte(tempPos + 1) & 0xff) << 8)
           | ((UnsafeUtil.getByte(tempPos + 2) & 0xff) << 16)
@@ -1800,11 +1926,11 @@ public abstract class CodedInputStream {
     public long readRawLittleEndian64() throws IOException {
       long tempPos = pos;
 
-      if (limit - tempPos < FIXED_64_SIZE) {
+      if (limit - tempPos < FIXED64_SIZE) {
         throw InvalidProtocolBufferException.truncatedMessage();
       }
 
-      pos = tempPos + FIXED_64_SIZE;
+      pos = tempPos + FIXED64_SIZE;
       return (((UnsafeUtil.getByte(tempPos) & 0xffL))
           | ((UnsafeUtil.getByte(tempPos + 1) & 0xffL) << 8)
           | ((UnsafeUtil.getByte(tempPos + 2) & 0xffL) << 16)
@@ -1943,27 +2069,6 @@ public abstract class CodedInputStream {
         buffer.limit(prevLimit);
       }
     }
-
-    private ByteBuffer copy(long begin, long end) throws IOException {
-      return ByteBuffer.wrap(copyToArray(begin, end));
-    }
-
-    private byte[] copyToArray(long begin, long end) throws IOException {
-      int prevPos = buffer.position();
-      int prevLimit = buffer.limit();
-      try {
-        buffer.position(bufferPos(begin));
-        buffer.limit(bufferPos(end));
-        byte[] bytes = new byte[(int) (end - begin)];
-        buffer.get(bytes);
-        return bytes;
-      } catch (IllegalArgumentException e) {
-        throw InvalidProtocolBufferException.truncatedMessage();
-      } finally {
-        buffer.position(prevPos);
-        buffer.limit(prevLimit);
-      }
-    }
   }
 
   /**
@@ -2034,7 +2139,7 @@ public abstract class CodedInputStream {
           skipRawVarint();
           return true;
         case WireFormat.WIRETYPE_FIXED64:
-          skipRawBytes(FIXED_64_SIZE);
+          skipRawBytes(FIXED64_SIZE);
           return true;
         case WireFormat.WIRETYPE_LENGTH_DELIMITED:
           skipRawBytes(readRawVarint32());
@@ -2047,7 +2152,7 @@ public abstract class CodedInputStream {
         case WireFormat.WIRETYPE_END_GROUP:
           return false;
         case WireFormat.WIRETYPE_FIXED32:
-          skipRawBytes(FIXED_32_SIZE);
+          skipRawBytes(FIXED32_SIZE);
           return true;
         default:
           throw InvalidProtocolBufferException.invalidWireType();
@@ -2240,11 +2345,15 @@ public abstract class CodedInputStream {
         bytes = readRawBytesSlowPath(size);
         tempPos = 0;
       }
-      // TODO(martinrb): We could save a pass by validating while decoding.
-      if (!Utf8.isValidUtf8(bytes, tempPos, tempPos + size)) {
-        throw InvalidProtocolBufferException.invalidUtf8();
+      if (ENABLE_CUSTOM_UTF8_DECODE) {
+        return Utf8.decodeUtf8(bytes, tempPos, size);
+      } else {
+        // TODO(martinrb): We could save a pass by validating while decoding.
+        if (!Utf8.isValidUtf8(bytes, tempPos, tempPos + size)) {
+          throw InvalidProtocolBufferException.invalidUtf8();
+        }
+        return new String(bytes, tempPos, size, UTF_8);
       }
-      return new String(bytes, tempPos, size, UTF_8);
     }
 
     @Override
@@ -2332,8 +2441,7 @@ public abstract class CodedInputStream {
       if (size == 0) {
         return ByteString.EMPTY;
       }
-      // Slow path:  Build a byte array first then copy it.
-      return ByteString.wrap(readRawBytesSlowPath(size));
+      return readBytesSlowPath(size);
     }
 
     @Override
@@ -2558,13 +2666,13 @@ public abstract class CodedInputStream {
     public int readRawLittleEndian32() throws IOException {
       int tempPos = pos;
 
-      if (bufferSize - tempPos < FIXED_32_SIZE) {
-        refillBuffer(FIXED_32_SIZE);
+      if (bufferSize - tempPos < FIXED32_SIZE) {
+        refillBuffer(FIXED32_SIZE);
         tempPos = pos;
       }
 
       final byte[] buffer = this.buffer;
-      pos = tempPos + FIXED_32_SIZE;
+      pos = tempPos + FIXED32_SIZE;
       return (((buffer[tempPos] & 0xff))
           | ((buffer[tempPos + 1] & 0xff) << 8)
           | ((buffer[tempPos + 2] & 0xff) << 16)
@@ -2575,13 +2683,13 @@ public abstract class CodedInputStream {
     public long readRawLittleEndian64() throws IOException {
       int tempPos = pos;
 
-      if (bufferSize - tempPos < FIXED_64_SIZE) {
-        refillBuffer(FIXED_64_SIZE);
+      if (bufferSize - tempPos < FIXED64_SIZE) {
+        refillBuffer(FIXED64_SIZE);
         tempPos = pos;
       }
 
       final byte[] buffer = this.buffer;
-      pos = tempPos + FIXED_64_SIZE;
+      pos = tempPos + FIXED64_SIZE;
       return (((buffer[tempPos] & 0xffL))
           | ((buffer[tempPos + 1] & 0xffL) << 8)
           | ((buffer[tempPos + 2] & 0xffL) << 16)
@@ -2675,7 +2783,13 @@ public abstract class CodedInputStream {
      */
     private void refillBuffer(int n) throws IOException {
       if (!tryRefillBuffer(n)) {
-        throw InvalidProtocolBufferException.truncatedMessage();
+        // We have to distinguish the exception between sizeLimitExceeded and truncatedMessage. So
+        // we just throw an sizeLimitExceeded exception here if it exceeds the sizeLimit
+        if (n > sizeLimit - totalBytesRetired - pos) {
+          throw InvalidProtocolBufferException.sizeLimitExceeded();
+        } else {
+          throw InvalidProtocolBufferException.truncatedMessage();
+        }
       }
     }
 
@@ -2684,8 +2798,8 @@ public abstract class CodedInputStream {
      * buffer. Caller must ensure that the requested space is not yet available, and that the
      * requested space is less than BUFFER_SIZE.
      *
-     * @return {@code true} if the bytes could be made available; {@code false} if the end of the
-     *     stream or the current limit was reached.
+     * @return {@code true} If the bytes could be made available; {@code false} 1. Current at the
+     *     end of the stream 2. The current limit was reached 3. The total size limit was reached
      */
     private boolean tryRefillBuffer(int n) throws IOException {
       if (pos + n <= bufferSize) {
@@ -2693,6 +2807,14 @@ public abstract class CodedInputStream {
             "refillBuffer() called when " + n + " bytes were already available in buffer");
       }
 
+      // Check whether the size of total message needs to read is bigger than the size limit.
+      // We shouldn't throw an exception here as isAtEnd() function needs to get this function's
+      // return as the result.
+      if (n > sizeLimit - totalBytesRetired - pos) {
+        return false;
+      }
+
+      // Shouldn't throw the exception here either.
       if (totalBytesRetired + pos + n > currentLimit) {
         // Oops, we hit a limit.
         return false;
@@ -2712,7 +2834,16 @@ public abstract class CodedInputStream {
         pos = 0;
       }
 
-      int bytesRead = input.read(buffer, bufferSize, buffer.length - bufferSize);
+      // Here we should refill the buffer as many bytes as possible.
+      int bytesRead =
+          input.read(
+              buffer,
+              bufferSize,
+              Math.min(
+                  //  the size of allocated but unused bytes in the buffer
+                  buffer.length - bufferSize,
+                  //  do not exceed the total bytes limit
+                  sizeLimit - totalBytesRetired - bufferSize));
       if (bytesRead == 0 || bytesRead < -1 || bytesRead > buffer.length) {
         throw new IllegalStateException(
             "InputStream#read(byte[]) returned invalid result: "
@@ -2721,10 +2852,6 @@ public abstract class CodedInputStream {
       }
       if (bytesRead > 0) {
         bufferSize += bytesRead;
-        // Integer-overflow-conscious check against sizeLimit
-        if (totalBytesRetired + n - sizeLimit > 0) {
-          throw InvalidProtocolBufferException.sizeLimitExceeded();
-        }
         recomputeBufferSizeAfterLimit();
         return (bufferSize >= n) ? true : tryRefillBuffer(n);
       }
@@ -2756,6 +2883,49 @@ public abstract class CodedInputStream {
      * (bufferSize - pos) && size > 0)
      */
     private byte[] readRawBytesSlowPath(final int size) throws IOException {
+      // Attempt to read the data in one byte array when it's safe to do.
+      byte[] result = readRawBytesSlowPathOneChunk(size);
+      if (result != null) {
+        return result;
+      }
+
+      final int originalBufferPos = pos;
+      final int bufferedBytes = bufferSize - pos;
+
+      // Mark the current buffer consumed.
+      totalBytesRetired += bufferSize;
+      pos = 0;
+      bufferSize = 0;
+
+      // Determine the number of bytes we need to read from the input stream.
+      int sizeLeft = size - bufferedBytes;
+
+      // The size is very large. For security reasons we read them in small
+      // chunks.
+      List<byte[]> chunks = readRawBytesSlowPathRemainingChunks(sizeLeft);
+
+      // OK, got everything.  Now concatenate it all into one buffer.
+      final byte[] bytes = new byte[size];
+
+      // Start by copying the leftover bytes from this.buffer.
+      System.arraycopy(buffer, originalBufferPos, bytes, 0, bufferedBytes);
+
+      // And now all the chunks.
+      int tempPos = bufferedBytes;
+      for (final byte[] chunk : chunks) {
+        System.arraycopy(chunk, 0, bytes, tempPos, chunk.length);
+        tempPos += chunk.length;
+      }
+
+      // Done.
+      return bytes;
+    }
+
+    /**
+     * Attempts to read the data in one byte array when it's safe to do. Returns null if the size to
+     * read is too large and needs to be allocated in smaller chunks for security reasons.
+     */
+    private byte[] readRawBytesSlowPathOneChunk(final int size) throws IOException {
       if (size == 0) {
         return Internal.EMPTY_BYTE_ARRAY;
       }
@@ -2776,14 +2946,7 @@ public abstract class CodedInputStream {
         throw InvalidProtocolBufferException.truncatedMessage();
       }
 
-      final int originalBufferPos = pos;
       final int bufferedBytes = bufferSize - pos;
-
-      // Mark the current buffer consumed.
-      totalBytesRetired += bufferSize;
-      pos = 0;
-      bufferSize = 0;
-
       // Determine the number of bytes we need to read from the input stream.
       int sizeLeft = size - bufferedBytes;
       // TODO(nathanmittler): Consider using a value larger than DEFAULT_BUFFER_SIZE.
@@ -2793,7 +2956,10 @@ public abstract class CodedInputStream {
         final byte[] bytes = new byte[size];
 
         // Copy all of the buffered bytes to the result buffer.
-        System.arraycopy(buffer, originalBufferPos, bytes, 0, bufferedBytes);
+        System.arraycopy(buffer, pos, bytes, 0, bufferedBytes);
+        totalBytesRetired += bufferSize;
+        pos = 0;
+        bufferSize = 0;
 
         // Fill the remaining bytes from the input stream.
         int tempPos = bufferedBytes;
@@ -2809,6 +2975,11 @@ public abstract class CodedInputStream {
         return bytes;
       }
 
+      return null;
+    }
+
+    /** Reads the remaining data in small chunks from the input stream. */
+    private List<byte[]> readRawBytesSlowPathRemainingChunks(int sizeLeft) throws IOException {
       // The size is very large.  For security reasons, we can't allocate the
       // entire byte array yet.  The size comes directly from the input, so a
       // maliciously-crafted message could provide a bogus very large size in
@@ -2834,21 +3005,41 @@ public abstract class CodedInputStream {
         chunks.add(chunk);
       }
 
-      // OK, got everything.  Now concatenate it all into one buffer.
-      final byte[] bytes = new byte[size];
-
-      // Start by copying the leftover bytes from this.buffer.
-      System.arraycopy(buffer, originalBufferPos, bytes, 0, bufferedBytes);
+      return chunks;
+    }
 
-      // And now all the chunks.
-      int tempPos = bufferedBytes;
-      for (final byte[] chunk : chunks) {
-        System.arraycopy(chunk, 0, bytes, tempPos, chunk.length);
-        tempPos += chunk.length;
+    /**
+     * Like readBytes, but caller must have already checked the fast path: (size <= (bufferSize -
+     * pos) && size > 0 || size == 0)
+     */
+    private ByteString readBytesSlowPath(final int size) throws IOException {
+      final byte[] result = readRawBytesSlowPathOneChunk(size);
+      if (result != null) {
+        return ByteString.wrap(result);
       }
 
-      // Done.
-      return bytes;
+      final int originalBufferPos = pos;
+      final int bufferedBytes = bufferSize - pos;
+
+      // Mark the current buffer consumed.
+      totalBytesRetired += bufferSize;
+      pos = 0;
+      bufferSize = 0;
+
+      // Determine the number of bytes we need to read from the input stream.
+      int sizeLeft = size - bufferedBytes;
+
+      // The size is very large. For security reasons we read them in small
+      // chunks.
+      List<byte[]> chunks = readRawBytesSlowPathRemainingChunks(sizeLeft);
+
+      // Wrap the byte arrays into a single ByteString.
+      List<ByteString> byteStrings = new ArrayList<ByteString>(1 + chunks.size());
+      byteStrings.add(ByteString.copyFrom(buffer, originalBufferPos, bufferedBytes));
+      for (byte[] chunk : chunks) {
+        byteStrings.add(ByteString.wrap(chunk));
+      }
+      return ByteString.copyFrom(byteStrings);
     }
 
     @Override
@@ -2893,4 +3084,859 @@ public abstract class CodedInputStream {
       pos = size - tempPos;
     }
   }
+
+  /**
+   * Implementation of {@link CodedInputStream} that uses an {@link Iterable <ByteBuffer>} as the
+   * data source. Requires the use of {@code sun.misc.Unsafe} to perform fast reads on the buffer.
+   */
+  private static final class IterableDirectByteBufferDecoder extends CodedInputStream {
+    /** The object that need to decode. */
+    private Iterable<ByteBuffer> input;
+    /** The {@link Iterator} with type {@link ByteBuffer} of {@code input} */
+    private Iterator<ByteBuffer> iterator;
+    /** The current ByteBuffer; */
+    private ByteBuffer currentByteBuffer;
+    /**
+     * If {@code true}, indicates that all the buffer are backing a {@link ByteString} and are
+     * therefore considered to be an immutable input source.
+     */
+    private boolean immutable;
+    /**
+     * If {@code true}, indicates that calls to read {@link ByteString} or {@code byte[]}
+     * <strong>may</strong> return slices of the underlying buffer, rather than copies.
+     */
+    private boolean enableAliasing;
+    /** The global total message length limit */
+    private int totalBufferSize;
+    /** The amount of available data in the input beyond {@link #currentLimit}. */
+    private int bufferSizeAfterCurrentLimit;
+    /** The absolute position of the end of the current message. */
+    private int currentLimit = Integer.MAX_VALUE;
+    /** The last tag that was read from this stream. */
+    private int lastTag;
+    /** Total Bytes have been Read from the {@link Iterable} {@link ByteBuffer} */
+    private int totalBytesRead;
+    /** The start position offset of the whole message, used as to reset the totalBytesRead */
+    private int startOffset;
+    /** The current position for current ByteBuffer */
+    private long currentByteBufferPos;
+
+    private long currentByteBufferStartPos;
+    /**
+     * If the current ByteBuffer is unsafe-direct based, currentAddress is the start address of this
+     * ByteBuffer; otherwise should be zero.
+     */
+    private long currentAddress;
+    /** The limit position for current ByteBuffer */
+    private long currentByteBufferLimit;
+
+    /**
+     * The constructor of {@code Iterable<ByteBuffer>} decoder.
+     *
+     * @param inputBufs The input data.
+     * @param size The total size of the input data.
+     * @param immutableFlag whether the input data is immutable.
+     */
+    private IterableDirectByteBufferDecoder(
+        Iterable<ByteBuffer> inputBufs, int size, boolean immutableFlag) {
+      totalBufferSize = size;
+      input = inputBufs;
+      iterator = input.iterator();
+      immutable = immutableFlag;
+      startOffset = totalBytesRead = 0;
+      if (size == 0) {
+        currentByteBuffer = EMPTY_BYTE_BUFFER;
+        currentByteBufferPos = 0;
+        currentByteBufferStartPos = 0;
+        currentByteBufferLimit = 0;
+        currentAddress = 0;
+      } else {
+        tryGetNextByteBuffer();
+      }
+    }
+
+    /** To get the next ByteBuffer from {@code input}, and then update the parameters */
+    private void getNextByteBuffer() throws InvalidProtocolBufferException {
+      if (!iterator.hasNext()) {
+        throw InvalidProtocolBufferException.truncatedMessage();
+      }
+      tryGetNextByteBuffer();
+    }
+
+    private void tryGetNextByteBuffer() {
+      currentByteBuffer = iterator.next();
+      totalBytesRead += (int) (currentByteBufferPos - currentByteBufferStartPos);
+      currentByteBufferPos = currentByteBuffer.position();
+      currentByteBufferStartPos = currentByteBufferPos;
+      currentByteBufferLimit = currentByteBuffer.limit();
+      currentAddress = UnsafeUtil.addressOffset(currentByteBuffer);
+      currentByteBufferPos += currentAddress;
+      currentByteBufferStartPos += currentAddress;
+      currentByteBufferLimit += currentAddress;
+    }
+
+    @Override
+    public int readTag() throws IOException {
+      if (isAtEnd()) {
+        lastTag = 0;
+        return 0;
+      }
+
+      lastTag = readRawVarint32();
+      if (WireFormat.getTagFieldNumber(lastTag) == 0) {
+        // If we actually read zero (or any tag number corresponding to field
+        // number zero), that's not a valid tag.
+        throw InvalidProtocolBufferException.invalidTag();
+      }
+      return lastTag;
+    }
+
+    @Override
+    public void checkLastTagWas(final int value) throws InvalidProtocolBufferException {
+      if (lastTag != value) {
+        throw InvalidProtocolBufferException.invalidEndTag();
+      }
+    }
+
+    @Override
+    public int getLastTag() {
+      return lastTag;
+    }
+
+    @Override
+    public boolean skipField(final int tag) throws IOException {
+      switch (WireFormat.getTagWireType(tag)) {
+        case WireFormat.WIRETYPE_VARINT:
+          skipRawVarint();
+          return true;
+        case WireFormat.WIRETYPE_FIXED64:
+          skipRawBytes(FIXED64_SIZE);
+          return true;
+        case WireFormat.WIRETYPE_LENGTH_DELIMITED:
+          skipRawBytes(readRawVarint32());
+          return true;
+        case WireFormat.WIRETYPE_START_GROUP:
+          skipMessage();
+          checkLastTagWas(
+              WireFormat.makeTag(WireFormat.getTagFieldNumber(tag), WireFormat.WIRETYPE_END_GROUP));
+          return true;
+        case WireFormat.WIRETYPE_END_GROUP:
+          return false;
+        case WireFormat.WIRETYPE_FIXED32:
+          skipRawBytes(FIXED32_SIZE);
+          return true;
+        default:
+          throw InvalidProtocolBufferException.invalidWireType();
+      }
+    }
+
+    @Override
+    public boolean skipField(final int tag, final CodedOutputStream output) throws IOException {
+      switch (WireFormat.getTagWireType(tag)) {
+        case WireFormat.WIRETYPE_VARINT:
+          {
+            long value = readInt64();
+            output.writeRawVarint32(tag);
+            output.writeUInt64NoTag(value);
+            return true;
+          }
+        case WireFormat.WIRETYPE_FIXED64:
+          {
+            long value = readRawLittleEndian64();
+            output.writeRawVarint32(tag);
+            output.writeFixed64NoTag(value);
+            return true;
+          }
+        case WireFormat.WIRETYPE_LENGTH_DELIMITED:
+          {
+            ByteString value = readBytes();
+            output.writeRawVarint32(tag);
+            output.writeBytesNoTag(value);
+            return true;
+          }
+        case WireFormat.WIRETYPE_START_GROUP:
+          {
+            output.writeRawVarint32(tag);
+            skipMessage(output);
+            int endtag =
+                WireFormat.makeTag(
+                    WireFormat.getTagFieldNumber(tag), WireFormat.WIRETYPE_END_GROUP);
+            checkLastTagWas(endtag);
+            output.writeRawVarint32(endtag);
+            return true;
+          }
+        case WireFormat.WIRETYPE_END_GROUP:
+          {
+            return false;
+          }
+        case WireFormat.WIRETYPE_FIXED32:
+          {
+            int value = readRawLittleEndian32();
+            output.writeRawVarint32(tag);
+            output.writeFixed32NoTag(value);
+            return true;
+          }
+        default:
+          throw InvalidProtocolBufferException.invalidWireType();
+      }
+    }
+
+    @Override
+    public void skipMessage() throws IOException {
+      while (true) {
+        final int tag = readTag();
+        if (tag == 0 || !skipField(tag)) {
+          return;
+        }
+      }
+    }
+
+    @Override
+    public void skipMessage(CodedOutputStream output) throws IOException {
+      while (true) {
+        final int tag = readTag();
+        if (tag == 0 || !skipField(tag, output)) {
+          return;
+        }
+      }
+    }
+
+    // -----------------------------------------------------------------
+
+    @Override
+    public double readDouble() throws IOException {
+      return Double.longBitsToDouble(readRawLittleEndian64());
+    }
+
+    @Override
+    public float readFloat() throws IOException {
+      return Float.intBitsToFloat(readRawLittleEndian32());
+    }
+
+    @Override
+    public long readUInt64() throws IOException {
+      return readRawVarint64();
+    }
+
+    @Override
+    public long readInt64() throws IOException {
+      return readRawVarint64();
+    }
+
+    @Override
+    public int readInt32() throws IOException {
+      return readRawVarint32();
+    }
+
+    @Override
+    public long readFixed64() throws IOException {
+      return readRawLittleEndian64();
+    }
+
+    @Override
+    public int readFixed32() throws IOException {
+      return readRawLittleEndian32();
+    }
+
+    @Override
+    public boolean readBool() throws IOException {
+      return readRawVarint64() != 0;
+    }
+
+    @Override
+    public String readString() throws IOException {
+      final int size = readRawVarint32();
+      if (size > 0 && size <= currentByteBufferLimit - currentByteBufferPos) {
+        byte[] bytes = new byte[size];
+        UnsafeUtil.copyMemory(currentByteBufferPos, bytes, 0, size);
+        String result = new String(bytes, UTF_8);
+        currentByteBufferPos += size;
+        return result;
+      } else if (size > 0 && size <= remaining()) {
+        // TODO(yilunchong): To use an underlying bytes[] instead of allocating a new bytes[]
+        byte[] bytes = new byte[size];
+        readRawBytesTo(bytes, 0, size);
+        String result = new String(bytes, UTF_8);
+        return result;
+      }
+
+      if (size == 0) {
+        return "";
+      }
+      if (size < 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    @Override
+    public String readStringRequireUtf8() throws IOException {
+      final int size = readRawVarint32();
+      if (size > 0 && size <= currentByteBufferLimit - currentByteBufferPos) {
+        if (ENABLE_CUSTOM_UTF8_DECODE) {
+          final int bufferPos = (int) (currentByteBufferPos - currentByteBufferStartPos);
+          String result = Utf8.decodeUtf8(currentByteBuffer, bufferPos, size);
+          currentByteBufferPos += size;
+          return result;
+        } else {
+          byte[] bytes = new byte[size];
+          UnsafeUtil.copyMemory(currentByteBufferPos, bytes, 0, size);
+          if (!Utf8.isValidUtf8(bytes)) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          String result = new String(bytes, UTF_8);
+          currentByteBufferPos += size;
+          return result;
+        }
+      }
+      if (size >= 0 && size <= remaining()) {
+        byte[] bytes = new byte[size];
+        readRawBytesTo(bytes, 0, size);
+        if (ENABLE_CUSTOM_UTF8_DECODE) {
+          return Utf8.decodeUtf8(bytes, 0, size);
+        } else {
+          if (!Utf8.isValidUtf8(bytes)) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          String result = new String(bytes, UTF_8);
+          return result;
+        }
+      }
+
+      if (size == 0) {
+        return "";
+      }
+      if (size <= 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    @Override
+    public void readGroup(
+        final int fieldNumber,
+        final MessageLite.Builder builder,
+        final ExtensionRegistryLite extensionRegistry)
+        throws IOException {
+      if (recursionDepth >= recursionLimit) {
+        throw InvalidProtocolBufferException.recursionLimitExceeded();
+      }
+      ++recursionDepth;
+      builder.mergeFrom(this, extensionRegistry);
+      checkLastTagWas(WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP));
+      --recursionDepth;
+    }
+
+
+    @Override
+    public <T extends MessageLite> T readGroup(
+        final int fieldNumber,
+        final Parser<T> parser,
+        final ExtensionRegistryLite extensionRegistry)
+        throws IOException {
+      if (recursionDepth >= recursionLimit) {
+        throw InvalidProtocolBufferException.recursionLimitExceeded();
+      }
+      ++recursionDepth;
+      T result = parser.parsePartialFrom(this, extensionRegistry);
+      checkLastTagWas(WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP));
+      --recursionDepth;
+      return result;
+    }
+
+    @Deprecated
+    @Override
+    public void readUnknownGroup(final int fieldNumber, final MessageLite.Builder builder)
+        throws IOException {
+      readGroup(fieldNumber, builder, ExtensionRegistryLite.getEmptyRegistry());
+    }
+
+    @Override
+    public void readMessage(
+        final MessageLite.Builder builder, final ExtensionRegistryLite extensionRegistry)
+        throws IOException {
+      final int length = readRawVarint32();
+      if (recursionDepth >= recursionLimit) {
+        throw InvalidProtocolBufferException.recursionLimitExceeded();
+      }
+      final int oldLimit = pushLimit(length);
+      ++recursionDepth;
+      builder.mergeFrom(this, extensionRegistry);
+      checkLastTagWas(0);
+      --recursionDepth;
+      popLimit(oldLimit);
+    }
+
+
+    @Override
+    public <T extends MessageLite> T readMessage(
+        final Parser<T> parser, final ExtensionRegistryLite extensionRegistry) throws IOException {
+      int length = readRawVarint32();
+      if (recursionDepth >= recursionLimit) {
+        throw InvalidProtocolBufferException.recursionLimitExceeded();
+      }
+      final int oldLimit = pushLimit(length);
+      ++recursionDepth;
+      T result = parser.parsePartialFrom(this, extensionRegistry);
+      checkLastTagWas(0);
+      --recursionDepth;
+      popLimit(oldLimit);
+      return result;
+    }
+
+    @Override
+    public ByteString readBytes() throws IOException {
+      final int size = readRawVarint32();
+      if (size > 0 && size <= currentByteBufferLimit - currentByteBufferPos) {
+        if (immutable && enableAliasing) {
+          final int idx = (int) (currentByteBufferPos - currentAddress);
+          final ByteString result = ByteString.wrap(slice(idx, idx + size));
+          currentByteBufferPos += size;
+          return result;
+        } else {
+          byte[] bytes;
+          bytes = new byte[size];
+          UnsafeUtil.copyMemory(currentByteBufferPos, bytes, 0, size);
+          currentByteBufferPos += size;
+          return ByteString.wrap(bytes);
+        }
+      } else if (size > 0 && size <= remaining()) {
+        byte[] temp = new byte[size];
+        readRawBytesTo(temp, 0, size);
+        return ByteString.wrap(temp);
+      }
+
+      if (size == 0) {
+        return ByteString.EMPTY;
+      }
+      if (size < 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    @Override
+    public byte[] readByteArray() throws IOException {
+      return readRawBytes(readRawVarint32());
+    }
+
+    @Override
+    public ByteBuffer readByteBuffer() throws IOException {
+      final int size = readRawVarint32();
+      if (size > 0 && size <= currentRemaining()) {
+        if (!immutable && enableAliasing) {
+          currentByteBufferPos += size;
+          return slice(
+              (int) (currentByteBufferPos - currentAddress - size),
+              (int) (currentByteBufferPos - currentAddress));
+        } else {
+          byte[] bytes = new byte[size];
+          UnsafeUtil.copyMemory(currentByteBufferPos, bytes, 0, size);
+          currentByteBufferPos += size;
+          return ByteBuffer.wrap(bytes);
+        }
+      } else if (size > 0 && size <= remaining()) {
+        byte[] temp = new byte[size];
+        readRawBytesTo(temp, 0, size);
+        return ByteBuffer.wrap(temp);
+      }
+
+      if (size == 0) {
+        return EMPTY_BYTE_BUFFER;
+      }
+      if (size < 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    @Override
+    public int readUInt32() throws IOException {
+      return readRawVarint32();
+    }
+
+    @Override
+    public int readEnum() throws IOException {
+      return readRawVarint32();
+    }
+
+    @Override
+    public int readSFixed32() throws IOException {
+      return readRawLittleEndian32();
+    }
+
+    @Override
+    public long readSFixed64() throws IOException {
+      return readRawLittleEndian64();
+    }
+
+    @Override
+    public int readSInt32() throws IOException {
+      return decodeZigZag32(readRawVarint32());
+    }
+
+    @Override
+    public long readSInt64() throws IOException {
+      return decodeZigZag64(readRawVarint64());
+    }
+
+    @Override
+    public int readRawVarint32() throws IOException {
+      fastpath:
+      {
+        long tempPos = currentByteBufferPos;
+
+        if (currentByteBufferLimit == currentByteBufferPos) {
+          break fastpath;
+        }
+
+        int x;
+        if ((x = UnsafeUtil.getByte(tempPos++)) >= 0) {
+          currentByteBufferPos++;
+          return x;
+        } else if (currentByteBufferLimit - currentByteBufferPos < 10) {
+          break fastpath;
+        } else if ((x ^= (UnsafeUtil.getByte(tempPos++) << 7)) < 0) {
+          x ^= (~0 << 7);
+        } else if ((x ^= (UnsafeUtil.getByte(tempPos++) << 14)) >= 0) {
+          x ^= (~0 << 7) ^ (~0 << 14);
+        } else if ((x ^= (UnsafeUtil.getByte(tempPos++) << 21)) < 0) {
+          x ^= (~0 << 7) ^ (~0 << 14) ^ (~0 << 21);
+        } else {
+          int y = UnsafeUtil.getByte(tempPos++);
+          x ^= y << 28;
+          x ^= (~0 << 7) ^ (~0 << 14) ^ (~0 << 21) ^ (~0 << 28);
+          if (y < 0
+              && UnsafeUtil.getByte(tempPos++) < 0
+              && UnsafeUtil.getByte(tempPos++) < 0
+              && UnsafeUtil.getByte(tempPos++) < 0
+              && UnsafeUtil.getByte(tempPos++) < 0
+              && UnsafeUtil.getByte(tempPos++) < 0) {
+            break fastpath; // Will throw malformedVarint()
+          }
+        }
+        currentByteBufferPos = tempPos;
+        return x;
+      }
+      return (int) readRawVarint64SlowPath();
+    }
+
+    @Override
+    public long readRawVarint64() throws IOException {
+      fastpath:
+      {
+        long tempPos = currentByteBufferPos;
+
+        if (currentByteBufferLimit == currentByteBufferPos) {
+          break fastpath;
+        }
+
+        long x;
+        int y;
+        if ((y = UnsafeUtil.getByte(tempPos++)) >= 0) {
+          currentByteBufferPos++;
+          return y;
+        } else if (currentByteBufferLimit - currentByteBufferPos < 10) {
+          break fastpath;
+        } else if ((y ^= (UnsafeUtil.getByte(tempPos++) << 7)) < 0) {
+          x = y ^ (~0 << 7);
+        } else if ((y ^= (UnsafeUtil.getByte(tempPos++) << 14)) >= 0) {
+          x = y ^ ((~0 << 7) ^ (~0 << 14));
+        } else if ((y ^= (UnsafeUtil.getByte(tempPos++) << 21)) < 0) {
+          x = y ^ ((~0 << 7) ^ (~0 << 14) ^ (~0 << 21));
+        } else if ((x = y ^ ((long) UnsafeUtil.getByte(tempPos++) << 28)) >= 0L) {
+          x ^= (~0L << 7) ^ (~0L << 14) ^ (~0L << 21) ^ (~0L << 28);
+        } else if ((x ^= ((long) UnsafeUtil.getByte(tempPos++) << 35)) < 0L) {
+          x ^= (~0L << 7) ^ (~0L << 14) ^ (~0L << 21) ^ (~0L << 28) ^ (~0L << 35);
+        } else if ((x ^= ((long) UnsafeUtil.getByte(tempPos++) << 42)) >= 0L) {
+          x ^= (~0L << 7) ^ (~0L << 14) ^ (~0L << 21) ^ (~0L << 28) ^ (~0L << 35) ^ (~0L << 42);
+        } else if ((x ^= ((long) UnsafeUtil.getByte(tempPos++) << 49)) < 0L) {
+          x ^=
+              (~0L << 7)
+                  ^ (~0L << 14)
+                  ^ (~0L << 21)
+                  ^ (~0L << 28)
+                  ^ (~0L << 35)
+                  ^ (~0L << 42)
+                  ^ (~0L << 49);
+        } else {
+          x ^= ((long) UnsafeUtil.getByte(tempPos++) << 56);
+          x ^=
+              (~0L << 7)
+                  ^ (~0L << 14)
+                  ^ (~0L << 21)
+                  ^ (~0L << 28)
+                  ^ (~0L << 35)
+                  ^ (~0L << 42)
+                  ^ (~0L << 49)
+                  ^ (~0L << 56);
+          if (x < 0L) {
+            if (UnsafeUtil.getByte(tempPos++) < 0L) {
+              break fastpath; // Will throw malformedVarint()
+            }
+          }
+        }
+        currentByteBufferPos = tempPos;
+        return x;
+      }
+      return readRawVarint64SlowPath();
+    }
+
+    @Override
+    long readRawVarint64SlowPath() throws IOException {
+      long result = 0;
+      for (int shift = 0; shift < 64; shift += 7) {
+        final byte b = readRawByte();
+        result |= (long) (b & 0x7F) << shift;
+        if ((b & 0x80) == 0) {
+          return result;
+        }
+      }
+      throw InvalidProtocolBufferException.malformedVarint();
+    }
+
+    @Override
+    public int readRawLittleEndian32() throws IOException {
+      if (currentRemaining() >= FIXED32_SIZE) {
+        long tempPos = currentByteBufferPos;
+        currentByteBufferPos += FIXED32_SIZE;
+        return (((UnsafeUtil.getByte(tempPos) & 0xff))
+            | ((UnsafeUtil.getByte(tempPos + 1) & 0xff) << 8)
+            | ((UnsafeUtil.getByte(tempPos + 2) & 0xff) << 16)
+            | ((UnsafeUtil.getByte(tempPos + 3) & 0xff) << 24));
+      }
+      return ((readRawByte() & 0xff)
+          | ((readRawByte() & 0xff) << 8)
+          | ((readRawByte() & 0xff) << 16)
+          | ((readRawByte() & 0xff) << 24));
+    }
+
+    @Override
+    public long readRawLittleEndian64() throws IOException {
+      if (currentRemaining() >= FIXED64_SIZE) {
+        long tempPos = currentByteBufferPos;
+        currentByteBufferPos += FIXED64_SIZE;
+        return (((UnsafeUtil.getByte(tempPos) & 0xffL))
+            | ((UnsafeUtil.getByte(tempPos + 1) & 0xffL) << 8)
+            | ((UnsafeUtil.getByte(tempPos + 2) & 0xffL) << 16)
+            | ((UnsafeUtil.getByte(tempPos + 3) & 0xffL) << 24)
+            | ((UnsafeUtil.getByte(tempPos + 4) & 0xffL) << 32)
+            | ((UnsafeUtil.getByte(tempPos + 5) & 0xffL) << 40)
+            | ((UnsafeUtil.getByte(tempPos + 6) & 0xffL) << 48)
+            | ((UnsafeUtil.getByte(tempPos + 7) & 0xffL) << 56));
+      }
+      return ((readRawByte() & 0xffL)
+          | ((readRawByte() & 0xffL) << 8)
+          | ((readRawByte() & 0xffL) << 16)
+          | ((readRawByte() & 0xffL) << 24)
+          | ((readRawByte() & 0xffL) << 32)
+          | ((readRawByte() & 0xffL) << 40)
+          | ((readRawByte() & 0xffL) << 48)
+          | ((readRawByte() & 0xffL) << 56));
+    }
+
+    @Override
+    public void enableAliasing(boolean enabled) {
+      this.enableAliasing = enabled;
+    }
+
+    @Override
+    public void resetSizeCounter() {
+      startOffset = (int) (totalBytesRead + currentByteBufferPos - currentByteBufferStartPos);
+    }
+
+    @Override
+    public int pushLimit(int byteLimit) throws InvalidProtocolBufferException {
+      if (byteLimit < 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      byteLimit += getTotalBytesRead();
+      final int oldLimit = currentLimit;
+      if (byteLimit > oldLimit) {
+        throw InvalidProtocolBufferException.truncatedMessage();
+      }
+      currentLimit = byteLimit;
+
+      recomputeBufferSizeAfterLimit();
+
+      return oldLimit;
+    }
+
+    private void recomputeBufferSizeAfterLimit() {
+      totalBufferSize += bufferSizeAfterCurrentLimit;
+      final int bufferEnd = totalBufferSize - startOffset;
+      if (bufferEnd > currentLimit) {
+        // Limit is in current buffer.
+        bufferSizeAfterCurrentLimit = bufferEnd - currentLimit;
+        totalBufferSize -= bufferSizeAfterCurrentLimit;
+      } else {
+        bufferSizeAfterCurrentLimit = 0;
+      }
+    }
+
+    @Override
+    public void popLimit(final int oldLimit) {
+      currentLimit = oldLimit;
+      recomputeBufferSizeAfterLimit();
+    }
+
+    @Override
+    public int getBytesUntilLimit() {
+      if (currentLimit == Integer.MAX_VALUE) {
+        return -1;
+      }
+
+      return currentLimit - getTotalBytesRead();
+    }
+
+    @Override
+    public boolean isAtEnd() throws IOException {
+      return totalBytesRead + currentByteBufferPos - currentByteBufferStartPos == totalBufferSize;
+    }
+
+    @Override
+    public int getTotalBytesRead() {
+      return (int)
+          (totalBytesRead - startOffset + currentByteBufferPos - currentByteBufferStartPos);
+    }
+
+    @Override
+    public byte readRawByte() throws IOException {
+      if (currentRemaining() == 0) {
+        getNextByteBuffer();
+      }
+      return UnsafeUtil.getByte(currentByteBufferPos++);
+    }
+
+    @Override
+    public byte[] readRawBytes(final int length) throws IOException {
+      if (length >= 0 && length <= currentRemaining()) {
+        byte[] bytes = new byte[length];
+        UnsafeUtil.copyMemory(currentByteBufferPos, bytes, 0, length);
+        currentByteBufferPos += length;
+        return bytes;
+      }
+      if (length >= 0 && length <= remaining()) {
+        byte[] bytes = new byte[length];
+        readRawBytesTo(bytes, 0, length);
+        return bytes;
+      }
+
+      if (length <= 0) {
+        if (length == 0) {
+          return EMPTY_BYTE_ARRAY;
+        } else {
+          throw InvalidProtocolBufferException.negativeSize();
+        }
+      }
+
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    /**
+     * Try to get raw bytes from {@code input} with the size of {@code length} and copy to {@code
+     * bytes} array. If the size is bigger than the number of remaining bytes in the input, then
+     * throw {@code truncatedMessage} exception.
+     *
+     * @param bytes
+     * @param offset
+     * @param length
+     * @throws IOException
+     */
+    private void readRawBytesTo(byte[] bytes, int offset, final int length) throws IOException {
+      if (length >= 0 && length <= remaining()) {
+        int l = length;
+        while (l > 0) {
+          if (currentRemaining() == 0) {
+            getNextByteBuffer();
+          }
+          int bytesToCopy = Math.min(l, (int) currentRemaining());
+          UnsafeUtil.copyMemory(currentByteBufferPos, bytes, length - l + offset, bytesToCopy);
+          l -= bytesToCopy;
+          currentByteBufferPos += bytesToCopy;
+        }
+        return;
+      }
+
+      if (length <= 0) {
+        if (length == 0) {
+          return;
+        } else {
+          throw InvalidProtocolBufferException.negativeSize();
+        }
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    @Override
+    public void skipRawBytes(final int length) throws IOException {
+      if (length >= 0
+          && length
+              <= (totalBufferSize
+                  - totalBytesRead
+                  - currentByteBufferPos
+                  + currentByteBufferStartPos)) {
+        // We have all the bytes we need already.
+        int l = length;
+        while (l > 0) {
+          if (currentRemaining() == 0) {
+            getNextByteBuffer();
+          }
+          int rl = Math.min(l, (int) currentRemaining());
+          l -= rl;
+          currentByteBufferPos += rl;
+        }
+        return;
+      }
+
+      if (length < 0) {
+        throw InvalidProtocolBufferException.negativeSize();
+      }
+      throw InvalidProtocolBufferException.truncatedMessage();
+    }
+
+    // TODO: optimize to fastpath
+    private void skipRawVarint() throws IOException {
+      for (int i = 0; i < MAX_VARINT_SIZE; i++) {
+        if (readRawByte() >= 0) {
+          return;
+        }
+      }
+      throw InvalidProtocolBufferException.malformedVarint();
+    }
+
+    /**
+     * Try to get the number of remaining bytes in {@code input}.
+     *
+     * @return the number of remaining bytes in {@code input}.
+     */
+    private int remaining() {
+      return (int)
+          (totalBufferSize - totalBytesRead - currentByteBufferPos + currentByteBufferStartPos);
+    }
+
+    /**
+     * Try to get the number of remaining bytes in {@code currentByteBuffer}.
+     *
+     * @return the number of remaining bytes in {@code currentByteBuffer}
+     */
+    private long currentRemaining() {
+      return (currentByteBufferLimit - currentByteBufferPos);
+    }
+
+    private ByteBuffer slice(int begin, int end) throws IOException {
+      int prevPos = currentByteBuffer.position();
+      int prevLimit = currentByteBuffer.limit();
+      try {
+        currentByteBuffer.position(begin);
+        currentByteBuffer.limit(end);
+        return currentByteBuffer.slice();
+      } catch (IllegalArgumentException e) {
+        throw InvalidProtocolBufferException.truncatedMessage();
+      } finally {
+        currentByteBuffer.position(prevPos);
+        currentByteBuffer.limit(prevLimit);
+      }
+    }
+  }
 }
diff --git a/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java b/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java
index 3e32c2c5..7b1ac651 100644
--- a/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java
+++ b/java/core/src/main/java/com/google/protobuf/CodedOutputStream.java
@@ -30,8 +30,8 @@
 
 package com.google.protobuf;
 
-import static com.google.protobuf.WireFormat.FIXED_32_SIZE;
-import static com.google.protobuf.WireFormat.FIXED_64_SIZE;
+import static com.google.protobuf.WireFormat.FIXED32_SIZE;
+import static com.google.protobuf.WireFormat.FIXED64_SIZE;
 import static com.google.protobuf.WireFormat.MAX_VARINT_SIZE;
 import static java.lang.Math.max;
 
@@ -59,13 +59,12 @@ import java.util.logging.Logger;
 public abstract class CodedOutputStream extends ByteOutput {
   private static final Logger logger = Logger.getLogger(CodedOutputStream.class.getName());
   private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS = UnsafeUtil.hasUnsafeArrayOperations();
-  private static final long ARRAY_BASE_OFFSET = UnsafeUtil.getArrayBaseOffset();
 
   /**
    * @deprecated Use {@link #computeFixed32SizeNoTag(int)} instead.
    */
   @Deprecated
-  public static final int LITTLE_ENDIAN_32_SIZE = FIXED_32_SIZE;
+  public static final int LITTLE_ENDIAN_32_SIZE = FIXED32_SIZE;
 
   /**
    * The buffer size used in {@link #newInstance(OutputStream)}.
@@ -184,7 +183,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    *     maps are sorted on the lexicographical order of the UTF8 encoded keys.
    * </ul>
    */
-  void useDeterministicSerialization() {
+  public void useDeterministicSerialization() {
     serializationDeterministic = true;
   }
 
@@ -378,6 +377,7 @@ public abstract class CodedOutputStream extends ByteOutput {
   public abstract void writeMessage(final int fieldNumber, final MessageLite value)
       throws IOException;
 
+
   /**
    * Write a MessageSet extension field to the stream.  For historical reasons,
    * the wire format differs from normal fields.
@@ -482,6 +482,7 @@ public abstract class CodedOutputStream extends ByteOutput {
   // Abstract to avoid overhead of additional virtual method calls.
   public abstract void writeMessageNoTag(final MessageLite value) throws IOException;
 
+
   //=================================================================
 
   @ExperimentalApi
@@ -667,6 +668,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     return computeTagSize(fieldNumber) + computeMessageSizeNoTag(value);
   }
 
+
   /**
    * Compute the number of bytes that would be needed to encode a
    * MessageSet extension to the stream.  For historical reasons,
@@ -755,7 +757,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code fixed32} field.
    */
   public static int computeFixed32SizeNoTag(@SuppressWarnings("unused") final int unused) {
-    return FIXED_32_SIZE;
+    return FIXED32_SIZE;
   }
 
   /**
@@ -763,7 +765,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code sfixed32} field.
    */
   public static int computeSFixed32SizeNoTag(@SuppressWarnings("unused") final int unused) {
-    return FIXED_32_SIZE;
+    return FIXED32_SIZE;
   }
 
   /**
@@ -813,7 +815,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code fixed64} field.
    */
   public static int computeFixed64SizeNoTag(@SuppressWarnings("unused") final long unused) {
-    return FIXED_64_SIZE;
+    return FIXED64_SIZE;
   }
 
   /**
@@ -821,7 +823,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code sfixed64} field.
    */
   public static int computeSFixed64SizeNoTag(@SuppressWarnings("unused") final long unused) {
-    return FIXED_64_SIZE;
+    return FIXED64_SIZE;
   }
 
   /**
@@ -829,7 +831,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code float} field, including tag.
    */
   public static int computeFloatSizeNoTag(@SuppressWarnings("unused") final float unused) {
-    return FIXED_32_SIZE;
+    return FIXED32_SIZE;
   }
 
   /**
@@ -837,7 +839,7 @@ public abstract class CodedOutputStream extends ByteOutput {
    * {@code double} field, including tag.
    */
   public static int computeDoubleSizeNoTag(@SuppressWarnings("unused") final double unused) {
-    return FIXED_64_SIZE;
+    return FIXED64_SIZE;
   }
 
   /**
@@ -914,6 +916,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     return computeLengthDelimitedFieldSize(value.getSerializedSize());
   }
 
+
   static int computeLengthDelimitedFieldSize(int fieldLength) {
     return computeUInt32SizeNoTag(fieldLength) + fieldLength;
   }
@@ -1050,6 +1053,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     writeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP);
   }
 
+
   /**
    * Write a {@code group} field to the stream.
    *
@@ -1060,6 +1064,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     value.writeTo(this);
   }
 
+
   /**
    * Compute the number of bytes that would be needed to encode a
    * {@code group} field, including tag.
@@ -1071,6 +1076,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     return computeTagSize(fieldNumber) * 2 + computeGroupSizeNoTag(value);
   }
 
+
   /**
    * Compute the number of bytes that would be needed to encode a
    * {@code group} field.
@@ -1080,6 +1086,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     return value.getSerializedSize();
   }
 
+
   /**
    * Encode and write a varint.  {@code value} is treated as
    * unsigned, so it won't be sign-extended if negative.
@@ -1274,6 +1281,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       writeMessageNoTag(value);
     }
 
+
     @Override
     public final void writeMessageSetExtension(final int fieldNumber, final MessageLite value)
         throws IOException {
@@ -1298,6 +1306,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       value.writeTo(this);
     }
 
+
     @Override
     public final void write(byte value) throws IOException {
       try {
@@ -1321,15 +1330,12 @@ public abstract class CodedOutputStream extends ByteOutput {
     @Override
     public final void writeUInt32NoTag(int value) throws IOException {
       if (HAS_UNSAFE_ARRAY_OPERATIONS && spaceLeft() >= MAX_VARINT_SIZE) {
-        long pos = ARRAY_BASE_OFFSET + position;
         while (true) {
           if ((value & ~0x7F) == 0) {
-            UnsafeUtil.putByte(buffer, pos++, (byte) value);
-            position++;
+            UnsafeUtil.putByte(buffer, position++, (byte) value);
             return;
           } else {
-            UnsafeUtil.putByte(buffer, pos++, (byte) ((value & 0x7F) | 0x80));
-            position++;
+            UnsafeUtil.putByte(buffer, position++, (byte) ((value & 0x7F) | 0x80));
             value >>>= 7;
           }
         }
@@ -1367,15 +1373,12 @@ public abstract class CodedOutputStream extends ByteOutput {
     @Override
     public final void writeUInt64NoTag(long value) throws IOException {
       if (HAS_UNSAFE_ARRAY_OPERATIONS && spaceLeft() >= MAX_VARINT_SIZE) {
-        long pos = ARRAY_BASE_OFFSET + position;
         while (true) {
           if ((value & ~0x7FL) == 0) {
-            UnsafeUtil.putByte(buffer, pos++, (byte) value);
-            position++;
+            UnsafeUtil.putByte(buffer, position++, (byte) value);
             return;
           } else {
-            UnsafeUtil.putByte(buffer, pos++, (byte) (((int) value & 0x7F) | 0x80));
-            position++;
+            UnsafeUtil.putByte(buffer, position++, (byte) (((int) value & 0x7F) | 0x80));
             value >>>= 7;
           }
         }
@@ -1615,6 +1618,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       writeMessageNoTag(value);
     }
 
+
     @Override
     public void writeMessageSetExtension(final int fieldNumber, final MessageLite value)
         throws IOException {
@@ -1639,6 +1643,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       value.writeTo(this);
     }
 
+
     @Override
     public void write(byte value) throws IOException {
       try {
@@ -1935,6 +1940,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       writeMessageNoTag(value);
     }
 
+
     @Override
     public void writeMessageSetExtension(int fieldNumber, MessageLite value) throws IOException {
       writeTag(WireFormat.MESSAGE_SET_ITEM, WireFormat.WIRETYPE_START_GROUP);
@@ -1957,6 +1963,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       value.writeTo(this);
     }
 
+
     @Override
     public void write(byte value) throws IOException {
       if (position >= limit) {
@@ -2030,7 +2037,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     @Override
     public void writeFixed32NoTag(int value) throws IOException {
       buffer.putInt(bufferPos(position), value);
-      position += FIXED_32_SIZE;
+      position += FIXED32_SIZE;
     }
 
     @Override
@@ -2064,7 +2071,7 @@ public abstract class CodedOutputStream extends ByteOutput {
     @Override
     public void writeFixed64NoTag(long value) throws IOException {
       buffer.putLong(bufferPos(position), value);
-      position += FIXED_64_SIZE;
+      position += FIXED64_SIZE;
     }
 
     @Override
@@ -2081,8 +2088,7 @@ public abstract class CodedOutputStream extends ByteOutput {
             String.format("Pos: %d, limit: %d, len: %d", position, limit, length));
       }
 
-      UnsafeUtil.copyMemory(
-          value, UnsafeUtil.getArrayBaseOffset() + offset, null, position, length);
+      UnsafeUtil.copyMemory(value, offset, position, length);
       position += length;
     }
 
@@ -2249,19 +2255,17 @@ public abstract class CodedOutputStream extends ByteOutput {
      */
     final void bufferUInt32NoTag(int value) {
       if (HAS_UNSAFE_ARRAY_OPERATIONS) {
-        final long originalPos = ARRAY_BASE_OFFSET + position;
-        long pos = originalPos;
+        final long originalPos = position;
         while (true) {
           if ((value & ~0x7F) == 0) {
-            UnsafeUtil.putByte(buffer, pos++, (byte) value);
+            UnsafeUtil.putByte(buffer, position++, (byte) value);
             break;
           } else {
-            UnsafeUtil.putByte(buffer, pos++, (byte) ((value & 0x7F) | 0x80));
+            UnsafeUtil.putByte(buffer, position++, (byte) ((value & 0x7F) | 0x80));
             value >>>= 7;
           }
         }
-        int delta = (int) (pos - originalPos);
-        position += delta;
+        int delta = (int) (position - originalPos);
         totalBytesWritten += delta;
       } else {
         while (true) {
@@ -2284,19 +2288,17 @@ public abstract class CodedOutputStream extends ByteOutput {
      */
     final void bufferUInt64NoTag(long value) {
       if (HAS_UNSAFE_ARRAY_OPERATIONS) {
-        final long originalPos = ARRAY_BASE_OFFSET + position;
-        long pos = originalPos;
+        final long originalPos = position;
         while (true) {
           if ((value & ~0x7FL) == 0) {
-            UnsafeUtil.putByte(buffer, pos++, (byte) value);
+            UnsafeUtil.putByte(buffer, position++, (byte) value);
             break;
           } else {
-            UnsafeUtil.putByte(buffer, pos++, (byte) (((int) value & 0x7F) | 0x80));
+            UnsafeUtil.putByte(buffer, position++, (byte) (((int) value & 0x7F) | 0x80));
             value >>>= 7;
           }
         }
-        int delta = (int) (pos - originalPos);
-        position += delta;
+        int delta = (int) (position - originalPos);
         totalBytesWritten += delta;
       } else {
         while (true) {
@@ -2322,7 +2324,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       buffer[position++] = (byte) ((value >> 8) & 0xFF);
       buffer[position++] = (byte) ((value >> 16) & 0xFF);
       buffer[position++] = (byte) ((value >> 24) & 0xFF);
-      totalBytesWritten += FIXED_32_SIZE;
+      totalBytesWritten += FIXED32_SIZE;
     }
 
     /**
@@ -2338,7 +2340,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       buffer[position++] = (byte) ((int) (value >> 40) & 0xFF);
       buffer[position++] = (byte) ((int) (value >> 48) & 0xFF);
       buffer[position++] = (byte) ((int) (value >> 56) & 0xFF);
-      totalBytesWritten += FIXED_64_SIZE;
+      totalBytesWritten += FIXED64_SIZE;
     }
   }
 
@@ -2379,7 +2381,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed32(final int fieldNumber, final int value) throws IOException {
-      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED_32_SIZE);
+      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED32_SIZE);
       bufferTag(fieldNumber, WireFormat.WIRETYPE_FIXED32);
       bufferFixed32NoTag(value);
     }
@@ -2393,7 +2395,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed64(final int fieldNumber, final long value) throws IOException {
-      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED_64_SIZE);
+      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED64_SIZE);
       bufferTag(fieldNumber, WireFormat.WIRETYPE_FIXED64);
       bufferFixed64NoTag(value);
     }
@@ -2468,6 +2470,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       writeMessageNoTag(value);
     }
 
+
     @Override
     public void writeMessageSetExtension(final int fieldNumber, final MessageLite value)
         throws IOException {
@@ -2492,6 +2495,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       value.writeTo(this);
     }
 
+
     @Override
     public void write(byte value) throws IOException {
       if (position == limit) {
@@ -2519,7 +2523,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed32NoTag(final int value) throws IOException {
-      flushIfNotAvailable(FIXED_32_SIZE);
+      flushIfNotAvailable(FIXED32_SIZE);
       bufferFixed32NoTag(value);
     }
 
@@ -2531,7 +2535,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed64NoTag(final long value) throws IOException {
-      flushIfNotAvailable(FIXED_64_SIZE);
+      flushIfNotAvailable(FIXED64_SIZE);
       bufferFixed64NoTag(value);
     }
 
@@ -2682,7 +2686,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed32(final int fieldNumber, final int value) throws IOException {
-      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED_32_SIZE);
+      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED32_SIZE);
       bufferTag(fieldNumber, WireFormat.WIRETYPE_FIXED32);
       bufferFixed32NoTag(value);
     }
@@ -2696,7 +2700,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed64(final int fieldNumber, final long value) throws IOException {
-      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED_64_SIZE);
+      flushIfNotAvailable(MAX_VARINT_SIZE + FIXED64_SIZE);
       bufferTag(fieldNumber, WireFormat.WIRETYPE_FIXED64);
       bufferFixed64NoTag(value);
     }
@@ -2771,6 +2775,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       writeMessageNoTag(value);
     }
 
+
     @Override
     public void writeMessageSetExtension(final int fieldNumber, final MessageLite value)
         throws IOException {
@@ -2795,6 +2800,7 @@ public abstract class CodedOutputStream extends ByteOutput {
       value.writeTo(this);
     }
 
+
     @Override
     public void write(byte value) throws IOException {
       if (position == limit) {
@@ -2822,7 +2828,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed32NoTag(final int value) throws IOException {
-      flushIfNotAvailable(FIXED_32_SIZE);
+      flushIfNotAvailable(FIXED32_SIZE);
       bufferFixed32NoTag(value);
     }
 
@@ -2834,7 +2840,7 @@ public abstract class CodedOutputStream extends ByteOutput {
 
     @Override
     public void writeFixed64NoTag(final long value) throws IOException {
-      flushIfNotAvailable(FIXED_64_SIZE);
+      flushIfNotAvailable(FIXED64_SIZE);
       bufferFixed64NoTag(value);
     }
 
diff --git a/java/core/src/main/java/com/google/protobuf/Descriptors.java b/java/core/src/main/java/com/google/protobuf/Descriptors.java
index 38346f15..75b16fe3 100644
--- a/java/core/src/main/java/com/google/protobuf/Descriptors.java
+++ b/java/core/src/main/java/com/google/protobuf/Descriptors.java
@@ -30,9 +30,10 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import com.google.protobuf.DescriptorProtos.*;
 import com.google.protobuf.Descriptors.FileDescriptor.Syntax;
-
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -682,9 +683,7 @@ public final class Descriptors {
 
     /** Determines if the given field name is reserved. */
     public boolean isReservedName(final String name) {
-      if (name == null) {
-        throw new NullPointerException();
-      }
+      checkNotNull(name);
       for (final String reservedName : proto.getReservedNameList()) {
         if (reservedName.equals(name)) {
           return true;
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_has_nano.proto b/java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java
index fe7d1794..7ae94349 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_has_nano.proto
+++ b/java/core/src/main/java/com/google/protobuf/DiscardUnknownFieldsParser.java
@@ -28,55 +28,44 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: ulas@google.com (Ulas Kirazci)
-
-package protobuf_unittest;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "NanoHasOuterClass";
-
-message TestAllTypesNanoHas {
-
-  message NestedMessage {
-    optional int32 bb = 1;
+package com.google.protobuf;
+
+/**
+ * Parsers to discard unknown fields during parsing.
+ */
+public final class DiscardUnknownFieldsParser {
+
+  /**
+   * Warps a given {@link Parser} into a new {@link Parser} that discards unknown fields during
+   * parsing.
+   *
+   * <p>Usage example:
+   * <pre>{@code
+     * private final static Parser<Foo> FOO_PARSER = DiscardUnknownFieldsParser.wrap(Foo.parser());
+     * Foo parseFooDiscardUnknown(ByteBuffer input) throws IOException {
+     *   return FOO_PARSER.parseFrom(input);
+     * }
+   * }</pre>
+   *
+   * <p>Like all other implementations of {@code Parser}, this parser is stateless and thread-safe.
+   *
+   * @param parser The delegated parser that parses messages.
+   * @return a {@link Parser} that will discard unknown fields during parsing.
+   */
+  public static final <T extends Message> Parser<T> wrap(final Parser<T> parser) {
+    return new AbstractParser<T>() {
+      @Override
+      public T parsePartialFrom(CodedInputStream input, ExtensionRegistryLite extensionRegistry)
+          throws InvalidProtocolBufferException {
+        try {
+          input.discardUnknownFields();
+          return parser.parsePartialFrom(input, extensionRegistry);
+        } finally {
+          input.unsetDiscardUnknownFields();
+        }
+      }
+    };
   }
 
-  enum NestedEnum {
-    FOO = 1;
-    BAR = 2;
-    BAZ = 3;
-  }
-
-  // Singular
-  optional int32  optional_int32    =  1;
-  optional float  optional_float    = 11;
-  optional double optional_double   = 12;
-  optional string optional_string   = 14;
-  optional bytes  optional_bytes    = 15;
-
-  optional NestedMessage optional_nested_message = 18;
-
-  optional NestedEnum optional_nested_enum = 21;
-
-  // Repeated
-  repeated int32  repeated_int32    = 31;
-  repeated string repeated_string   = 44;
-  repeated bytes  repeated_bytes    = 45;
-
-  repeated NestedMessage repeated_nested_message  = 48;
-
-  repeated NestedEnum repeated_nested_enum  = 51;
-
-  // Singular with defaults
-  optional int32  default_int32    = 61 [default =  41    ];
-  optional string default_string   = 74 [default = "hello"];
-  optional bytes  default_bytes    = 75 [default = "world"];
-
-  optional float default_float_nan = 99  [default =  nan];
-
-  optional NestedEnum default_nested_enum = 81 [default = BAR];
-
-  required int32 id = 86;
-  required NestedEnum required_enum = 87;
-
+  private DiscardUnknownFieldsParser() {}
 }
diff --git a/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java b/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java
index 6177f3ca..5b28b4a8 100644
--- a/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/DoubleArrayList.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.DoubleList;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.DoubleList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.RandomAccess;
@@ -41,9 +42,8 @@ import java.util.RandomAccess;
  *
  * @author dweis@google.com (Daniel Weis)
  */
-final class DoubleArrayList
-    extends AbstractProtobufList<Double>
-    implements DoubleList, RandomAccess {
+final class DoubleArrayList extends AbstractProtobufList<Double>
+    implements DoubleList, RandomAccess, PrimitiveNonBoxingCollection {
 
   private static final DoubleArrayList EMPTY_LIST = new DoubleArrayList();
   static {
@@ -82,6 +82,18 @@ final class DoubleArrayList
   }
 
   @Override
+  protected void removeRange(int fromIndex, int toIndex) {
+    ensureIsMutable();
+    if (toIndex < fromIndex) {
+      throw new IndexOutOfBoundsException("toIndex < fromIndex");
+    }
+
+    System.arraycopy(array, toIndex, array, fromIndex, size - toIndex);
+    size -= (toIndex - fromIndex);
+    modCount++;
+  }
+
+  @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
@@ -199,9 +211,7 @@ final class DoubleArrayList
   public boolean addAll(Collection<? extends Double> collection) {
     ensureIsMutable();
 
-    if (collection == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(collection);
 
     // We specialize when adding another DoubleArrayList to avoid boxing elements.
     if (!(collection instanceof DoubleArrayList)) {
@@ -249,7 +259,9 @@ final class DoubleArrayList
     ensureIsMutable();
     ensureIndexInRange(index);
     double value = array[index];
-    System.arraycopy(array, index + 1, array, index, size - index);
+    if (index < size - 1) {
+      System.arraycopy(array, index + 1, array, index, size - index);
+    }
     size--;
     modCount++;
     return value;
diff --git a/java/core/src/main/java/com/google/protobuf/DynamicMessage.java b/java/core/src/main/java/com/google/protobuf/DynamicMessage.java
index e6358c3b..a6a774b7 100644
--- a/java/core/src/main/java/com/google/protobuf/DynamicMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/DynamicMessage.java
@@ -30,11 +30,12 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
 import com.google.protobuf.Descriptors.OneofDescriptor;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Collections;
@@ -338,6 +339,20 @@ public final class DynamicMessage extends AbstractMessage {
       this.fields = FieldSet.newFieldSet();
       this.unknownFields = UnknownFieldSet.getDefaultInstance();
       this.oneofCases = new FieldDescriptor[type.toProto().getOneofDeclCount()];
+      // A MapEntry has all of its fields present at all times.
+      if (type.getOptions().getMapEntry()) {
+        populateMapEntry();
+      }
+    }
+
+    private void populateMapEntry() {
+      for (FieldDescriptor field : type.getFields()) {
+        if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
+          fields.setField(field, getDefaultInstance(field.getMessageType()));
+        } else {
+          fields.setField(field, field.getDefaultValue());
+        }
+      }
     }
 
     // ---------------------------------------------------------------
@@ -350,6 +365,10 @@ public final class DynamicMessage extends AbstractMessage {
       } else {
         fields.clear();
       }
+      // A MapEntry has all of its fields present at all times.
+      if (type.getOptions().getMapEntry()) {
+        populateMapEntry();
+      }
       unknownFields = UnknownFieldSet.getDefaultInstance();
       return this;
     }
@@ -589,9 +608,8 @@ public final class DynamicMessage extends AbstractMessage {
 
     @Override
     public Builder setUnknownFields(UnknownFieldSet unknownFields) {
-      if (getDescriptorForType().getFile().getSyntax()
-          == Descriptors.FileDescriptor.Syntax.PROTO3) {
-        // Proto3 discards unknown fields.
+      if (getDescriptorForType().getFile().getSyntax() == Descriptors.FileDescriptor.Syntax.PROTO3
+          && CodedInputStream.getProto3DiscardUnknownFieldsDefault()) {
         return this;
       }
       this.unknownFields = unknownFields;
@@ -600,9 +618,8 @@ public final class DynamicMessage extends AbstractMessage {
 
     @Override
     public Builder mergeUnknownFields(UnknownFieldSet unknownFields) {
-      if (getDescriptorForType().getFile().getSyntax()
-          == Descriptors.FileDescriptor.Syntax.PROTO3) {
-        // Proto3 discards unknown fields.
+      if (getDescriptorForType().getFile().getSyntax() == Descriptors.FileDescriptor.Syntax.PROTO3
+          && CodedInputStream.getProto3DiscardUnknownFieldsDefault()) {
         return this;
       }
       this.unknownFields =
@@ -631,9 +648,7 @@ public final class DynamicMessage extends AbstractMessage {
     /** Verifies that the value is EnumValueDescriptor and matches Enum Type. */
     private void ensureSingularEnumValueDescriptor(
         FieldDescriptor field, Object value) {
-      if (value == null) {
-        throw new NullPointerException();
-      }
+      checkNotNull(value);
       if (!(value instanceof EnumValueDescriptor)) {
         throw new IllegalArgumentException(
           "DynamicMessage should use EnumValueDescriptor to set Enum Value.");
diff --git a/java/core/src/main/java/com/google/protobuf/Extension.java b/java/core/src/main/java/com/google/protobuf/Extension.java
index 08ec5b45..5df12e64 100644
--- a/java/core/src/main/java/com/google/protobuf/Extension.java
+++ b/java/core/src/main/java/com/google/protobuf/Extension.java
@@ -58,10 +58,7 @@ public abstract class Extension<ContainingType extends MessageLite, Type>
     PROTO1,
   }
 
-  protected ExtensionType getExtensionType() {
-    // TODO(liujisi): make this abstract after we fix proto1.
-    return ExtensionType.IMMUTABLE;
-  }
+  protected abstract ExtensionType getExtensionType();
 
   /**
    * Type of a message extension.
@@ -70,7 +67,7 @@ public abstract class Extension<ContainingType extends MessageLite, Type>
     PROTO1,
     PROTO2,
   }
-  
+
   /**
    * If the extension is a message extension (i.e., getLiteType() == MESSAGE),
    * returns the type of the message, otherwise undefined.
diff --git a/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java b/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java
index 23174e24..89f7ab9b 100644
--- a/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java
+++ b/java/core/src/main/java/com/google/protobuf/ExtensionRegistryFactory.java
@@ -34,7 +34,7 @@ import static com.google.protobuf.ExtensionRegistryLite.EMPTY_REGISTRY_LITE;
 
 /**
  * A factory object to create instances of {@link ExtensionRegistryLite}.
- * 
+ *
  * <p>
  * This factory detects (via reflection) if the full (non-Lite) protocol buffer libraries
  * are available, and if so, the instances returned are actually {@link ExtensionRegistry}.
@@ -82,6 +82,7 @@ final class ExtensionRegistryFactory {
     return EMPTY_REGISTRY_LITE;
   }
 
+
   static boolean isFullRegistry(ExtensionRegistryLite registry) {
     return EXTENSION_REGISTRY_CLASS != null
         && EXTENSION_REGISTRY_CLASS.isAssignableFrom(registry.getClass());
@@ -90,6 +91,6 @@ final class ExtensionRegistryFactory {
   private static final ExtensionRegistryLite invokeSubclassFactory(String methodName)
       throws Exception {
     return (ExtensionRegistryLite) EXTENSION_REGISTRY_CLASS
-        .getMethod(methodName).invoke(null);
+        .getDeclaredMethod(methodName).invoke(null);
   }
 }
diff --git a/java/core/src/main/java/com/google/protobuf/FieldSet.java b/java/core/src/main/java/com/google/protobuf/FieldSet.java
index a828f30e..c09daa32 100644
--- a/java/core/src/main/java/com/google/protobuf/FieldSet.java
+++ b/java/core/src/main/java/com/google/protobuf/FieldSet.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.LazyField.LazyIterator;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.LazyField.LazyIterator;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -101,6 +102,11 @@ final class FieldSet<FieldDescriptorType extends
   @SuppressWarnings("rawtypes")
   private static final FieldSet DEFAULT_INSTANCE = new FieldSet(true);
 
+  /** Returns {@code true} if empty, {@code false} otherwise. */
+  boolean isEmpty() {
+    return fields.isEmpty();
+  }
+
   /** Make this FieldSet immutable from this point forward. */
   @SuppressWarnings("unchecked")
   public void makeImmutable() {
@@ -385,9 +391,7 @@ final class FieldSet<FieldDescriptorType extends
    */
   private static void verifyType(final WireFormat.FieldType type,
                                  final Object value) {
-    if (value == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(value);
 
     boolean isValid = false;
     switch (type.getJavaType()) {
diff --git a/java/core/src/main/java/com/google/protobuf/FloatArrayList.java b/java/core/src/main/java/com/google/protobuf/FloatArrayList.java
index 90d6154b..7c080af3 100644
--- a/java/core/src/main/java/com/google/protobuf/FloatArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/FloatArrayList.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.FloatList;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.FloatList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.RandomAccess;
@@ -41,9 +42,8 @@ import java.util.RandomAccess;
  *
  * @author dweis@google.com (Daniel Weis)
  */
-final class FloatArrayList
-    extends AbstractProtobufList<Float>
-    implements FloatList, RandomAccess {
+final class FloatArrayList extends AbstractProtobufList<Float>
+    implements FloatList, RandomAccess, PrimitiveNonBoxingCollection {
 
   private static final FloatArrayList EMPTY_LIST = new FloatArrayList();
   static {
@@ -82,6 +82,18 @@ final class FloatArrayList
   }
 
   @Override
+  protected void removeRange(int fromIndex, int toIndex) {
+    ensureIsMutable();
+    if (toIndex < fromIndex) {
+      throw new IndexOutOfBoundsException("toIndex < fromIndex");
+    }
+
+    System.arraycopy(array, toIndex, array, fromIndex, size - toIndex);
+    size -= (toIndex - fromIndex);
+    modCount++;
+  }
+
+  @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
@@ -198,9 +210,7 @@ final class FloatArrayList
   public boolean addAll(Collection<? extends Float> collection) {
     ensureIsMutable();
 
-    if (collection == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(collection);
 
     // We specialize when adding another FloatArrayList to avoid boxing elements.
     if (!(collection instanceof FloatArrayList)) {
@@ -248,7 +258,9 @@ final class FloatArrayList
     ensureIsMutable();
     ensureIndexInRange(index);
     float value = array[index];
-    System.arraycopy(array, index + 1, array, index, size - index);
+    if (index < size - 1) {
+      System.arraycopy(array, index + 1, array, index, size - index);
+    }
     size--;
     modCount++;
     return value;
diff --git a/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
index cea05794..60179e37 100644
--- a/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessage.java
@@ -854,6 +854,7 @@ public abstract class GeneratedMessage extends AbstractMessage
 
     /** Check if a singular extension is present. */
     @Override
+    @SuppressWarnings("unchecked")
     public final <Type> boolean hasExtension(final ExtensionLite<MessageType, Type> extensionLite) {
       Extension<MessageType, Type> extension = checkNotLite(extensionLite);
 
@@ -863,6 +864,7 @@ public abstract class GeneratedMessage extends AbstractMessage
 
     /** Get the number of elements in a repeated extension. */
     @Override
+    @SuppressWarnings("unchecked")
     public final <Type> int getExtensionCount(
         final ExtensionLite<MessageType, List<Type>> extensionLite) {
       Extension<MessageType, List<Type>> extension = checkNotLite(extensionLite);
@@ -2555,6 +2557,7 @@ public abstract class GeneratedMessage extends AbstractMessage
       }
 
       @Override
+      @SuppressWarnings("unchecked")
       public Object get(GeneratedMessage message) {
         List result = new ArrayList();
         for (int i = 0; i < getRepeatedCount(message); i++) {
@@ -2564,6 +2567,7 @@ public abstract class GeneratedMessage extends AbstractMessage
       }
 
       @Override
+      @SuppressWarnings("unchecked")
       public Object get(Builder builder) {
         List result = new ArrayList();
         for (int i = 0; i < getRepeatedCount(builder); i++) {
diff --git a/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java
index f885b01e..df01547e 100644
--- a/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessageLite.java
@@ -31,9 +31,9 @@
 package com.google.protobuf;
 
 import com.google.protobuf.AbstractMessageLite.Builder.LimitedInputStream;
-import com.google.protobuf.GeneratedMessageLite.EqualsVisitor.NotEqualsException;
 import com.google.protobuf.Internal.BooleanList;
 import com.google.protobuf.Internal.DoubleList;
+import com.google.protobuf.Internal.EnumLiteMap;
 import com.google.protobuf.Internal.FloatList;
 import com.google.protobuf.Internal.IntList;
 import com.google.protobuf.Internal.LongList;
@@ -45,11 +45,13 @@ import java.io.ObjectStreamException;
 import java.io.Serializable;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Lite version of {@link GeneratedMessage}.
@@ -60,6 +62,12 @@ public abstract class GeneratedMessageLite<
     MessageType extends GeneratedMessageLite<MessageType, BuilderType>,
     BuilderType extends GeneratedMessageLite.Builder<MessageType, BuilderType>>
         extends AbstractMessageLite<MessageType, BuilderType> {
+  // BEGIN REGULAR
+  static final boolean ENABLE_EXPERIMENTAL_RUNTIME_AT_BUILD_TIME = false;
+  // END REGULAR
+  // BEGIN EXPERIMENTAL
+  // static final boolean ENABLE_EXPERIMENTAL_RUNTIME_AT_BUILD_TIME = true;
+  // END EXPERIMENTAL
 
   /** For use by generated code only. Lazily initialized to reduce allocations. */
   protected UnknownFieldSetLite unknownFields = UnknownFieldSetLite.getDefaultInstance();
@@ -105,14 +113,22 @@ public abstract class GeneratedMessageLite<
   @SuppressWarnings("unchecked") // Guaranteed by runtime
   @Override
   public int hashCode() {
-    if (memoizedHashCode == 0) {
-      HashCodeVisitor visitor = new HashCodeVisitor();
-      visit(visitor, (MessageType) this);
-      memoizedHashCode = visitor.hashCode;
-    }
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    // BEGIN EXPERIMENTAL
+    // memoizedHashCode = Protobuf.getInstance().schemaFor(this).hashCode(this);
+    // return memoizedHashCode;
+    // END EXPERIMENTAL
+    // BEGIN REGULAR
+    HashCodeVisitor visitor = new HashCodeVisitor();
+    visit(visitor, (MessageType) this);
+    memoizedHashCode = visitor.hashCode;
     return memoizedHashCode;
+    // END REGULAR
   }
 
+  // BEGIN REGULAR
   @SuppressWarnings("unchecked") // Guaranteed by runtime
   int hashCode(HashCodeVisitor visitor) {
     if (memoizedHashCode == 0) {
@@ -124,6 +140,7 @@ public abstract class GeneratedMessageLite<
     }
     return memoizedHashCode;
   }
+  // END REGULAR
 
   @SuppressWarnings("unchecked") // Guaranteed by isInstance + runtime
   @Override
@@ -136,17 +153,22 @@ public abstract class GeneratedMessageLite<
       return false;
     }
 
+    // BEGIN EXPERIMENTAL
+    // return Protobuf.getInstance().schemaFor(this).equals(this, (MessageType) other);
+    // END EXPERIMENTAL
+    // BEGIN REGULAR
+
     try {
       visit(EqualsVisitor.INSTANCE, (MessageType) other);
-    } catch (NotEqualsException e) {
+    } catch (EqualsVisitor.NotEqualsException e) {
       return false;
     }
     return true;
+    // END REGULAR
   }
 
-  /**
-   * Same as {@link #equals(Object)} but throws {@code NotEqualsException}.
-   */
+  // BEGIN REGULAR
+  /** Same as {@link #equals(Object)} but throws {@code NotEqualsException}. */
   @SuppressWarnings("unchecked") // Guaranteed by isInstance + runtime
   boolean equals(EqualsVisitor visitor, MessageLite other) {
     if (this == other) {
@@ -160,14 +182,13 @@ public abstract class GeneratedMessageLite<
     visit(visitor, (MessageType) other);
     return true;
   }
+  // END REGULAR
 
   // The general strategy for unknown fields is to use an UnknownFieldSetLite that is treated as
   // mutable during the parsing constructor and immutable after. This allows us to avoid
   // any unnecessary intermediary allocations while reducing the generated code size.
 
-  /**
-   * Lazily initializes unknown fields.
-   */
+  /** Lazily initializes unknown fields. */
   private final void ensureUnknownFieldsInitialized() {
     if (unknownFields == UnknownFieldSetLite.getDefaultInstance()) {
       unknownFields = UnknownFieldSetLite.newInstance();
@@ -209,17 +230,36 @@ public abstract class GeneratedMessageLite<
    * Called by subclasses to complete parsing. For use by generated code only.
    */
   protected void makeImmutable() {
+    // BEGIN REGULAR
     dynamicMethod(MethodToInvoke.MAKE_IMMUTABLE);
-
     unknownFields.makeImmutable();
+    // END REGULAR
+    // BEGIN EXPERIMENTAL
+    // Protobuf.getInstance().schemaFor(this).makeImmutable(this);
+    // END EXPERIMENTAL
+  }
+
+  protected final <
+    MessageType extends GeneratedMessageLite<MessageType, BuilderType>,
+    BuilderType extends GeneratedMessageLite.Builder<MessageType, BuilderType>>
+        BuilderType createBuilder() {
+    return (BuilderType) dynamicMethod(MethodToInvoke.NEW_BUILDER);
+  }
+
+  protected final <
+    MessageType extends GeneratedMessageLite<MessageType, BuilderType>,
+    BuilderType extends GeneratedMessageLite.Builder<MessageType, BuilderType>>
+        BuilderType createBuilder(MessageType prototype) {
+    return ((BuilderType) createBuilder()).mergeFrom(prototype);
   }
 
   @Override
   public final boolean isInitialized() {
-    return dynamicMethod(MethodToInvoke.IS_INITIALIZED, Boolean.TRUE) != null;
+    return isInitialized((MessageType) this, Boolean.TRUE);
   }
 
   @Override
+  @SuppressWarnings("unchecked")
   public final BuilderType toBuilder() {
     BuilderType builder = (BuilderType) dynamicMethod(MethodToInvoke.NEW_BUILDER);
     builder.mergeFrom((MessageType) this);
@@ -233,11 +273,15 @@ public abstract class GeneratedMessageLite<
    * For use by generated code only.
    */
   public static enum MethodToInvoke {
-    // Rely on/modify instance state
+    // BEGIN REGULAR
     IS_INITIALIZED,
     VISIT,
     MERGE_FROM_STREAM,
     MAKE_IMMUTABLE,
+    // END REGULAR
+    // Rely on/modify instance state
+    GET_MEMOIZED_IS_INITIALIZED,
+    SET_MEMOIZED_IS_INITIALIZED,
 
     // Rely on static state
     NEW_MUTABLE_INSTANCE,
@@ -251,25 +295,30 @@ public abstract class GeneratedMessageLite<
    * Theses different kinds of operations are required to implement message-level operations for
    * builders in the runtime. This method bundles those operations to reduce the generated methods
    * count.
+   *
    * <ul>
-   * <li>{@code MERGE_FROM_STREAM} is parameterized with an {@link CodedInputStream} and
-   * {@link ExtensionRegistryLite}. It consumes the input stream, parsing the contents into the
-   * returned protocol buffer. If parsing throws an {@link InvalidProtocolBufferException}, the
-   * implementation wraps it in a RuntimeException.
-   * <li>{@code NEW_INSTANCE} returns a new instance of the protocol buffer that has not yet been
-   * made immutable. See {@code MAKE_IMMUTABLE}.
-   * <li>{@code IS_INITIALIZED} is parameterized with a {@code Boolean} detailing whether to
-   * memoize. It returns {@code null} for false and the default instance for true. We optionally
-   * memoize to support the Builder case, where memoization is not desired.
-   * <li>{@code NEW_BUILDER} returns a {@code BuilderType} instance.
-   * <li>{@code VISIT} is parameterized with a {@code Visitor} and a {@code MessageType} and
-   * recursively iterates through the fields side by side between this and the instance.
-   * <li>{@code MAKE_IMMUTABLE} sets all internal fields to an immutable state.
+   *   <li>{@code MERGE_FROM_STREAM} is parameterized with an {@link CodedInputStream} and {@link
+   *       ExtensionRegistryLite}. It consumes the input stream, parsing the contents into the
+   *       returned protocol buffer. If parsing throws an {@link InvalidProtocolBufferException},
+   *       the implementation wraps it in a RuntimeException.
+   *   <li>{@code NEW_INSTANCE} returns a new instance of the protocol buffer that has not yet been
+   *       made immutable. See {@code MAKE_IMMUTABLE}.
+   *   <li>{@code IS_INITIALIZED} returns {@code null} for false and the default instance for true.
+   *       It doesn't use or modify any memoized value.
+   *   <li>{@code GET_MEMOIZED_IS_INITIALIZED} returns the memoized {@code isInitialized} byte
+   *       value.
+   *   <li>{@code SET_MEMOIZED_IS_INITIALIZED} sets the memoized {@code isInitilaized} byte value to
+   *       1 if the first parameter is not null, or to 0 if the first parameter is null.
+   *   <li>{@code NEW_BUILDER} returns a {@code BuilderType} instance.
+   *   <li>{@code VISIT} is parameterized with a {@code Visitor} and a {@code MessageType} and
+   *       recursively iterates through the fields side by side between this and the instance.
+   *   <li>{@code MAKE_IMMUTABLE} sets all internal fields to an immutable state.
    * </ul>
+   *
    * This method, plus the implementation of the Builder, enables the Builder class to be proguarded
    * away entirely on Android.
-   * <p>
-   * For use by generated code only.
+   *
+   * <p>For use by generated code only.
    */
   protected abstract Object dynamicMethod(MethodToInvoke method, Object arg0, Object arg1);
 
@@ -287,14 +336,27 @@ public abstract class GeneratedMessageLite<
     return dynamicMethod(method, null, null);
   }
 
+  // BEGIN REGULAR
   void visit(Visitor visitor, MessageType other) {
     dynamicMethod(MethodToInvoke.VISIT, visitor, other);
     unknownFields = visitor.visitUnknownFields(unknownFields, other.unknownFields);
   }
+  // END REGULAR
+
+  @Override
+  int getMemoizedSerializedSize() {
+    return memoizedSerializedSize;
+  }
+
+  @Override
+  void setMemoizedSerializedSize(int size) {
+    memoizedSerializedSize = size;
+  }
+
+
 
   /**
-   * Merge some unknown fields into the {@link UnknownFieldSetLite} for this
-   * message.
+   * Merge some unknown fields into the {@link UnknownFieldSetLite} for this message.
    *
    * <p>For use by generated code only.
    */
@@ -327,7 +389,7 @@ public abstract class GeneratedMessageLite<
       if (isBuilt) {
         MessageType newInstance =
             (MessageType) instance.dynamicMethod(MethodToInvoke.NEW_MUTABLE_INSTANCE);
-        newInstance.visit(MergeFromVisitor.INSTANCE, instance);
+        mergeFromInstance(newInstance, instance);
         instance = newInstance;
         isBuilt = false;
       }
@@ -382,23 +444,60 @@ public abstract class GeneratedMessageLite<
     /** All subclasses implement this. */
     public BuilderType mergeFrom(MessageType message) {
       copyOnWrite();
-      instance.visit(MergeFromVisitor.INSTANCE, message);
+      mergeFromInstance(instance, message);
       return (BuilderType) this;
     }
 
+    private void mergeFromInstance(MessageType dest, MessageType src) {
+      // BEGIN EXPERIMENTAL
+      // Protobuf.getInstance().schemaFor(dest).mergeFrom(dest, src);
+      // END EXPERIMENTAL
+      // BEGIN REGULAR
+      dest.visit(MergeFromVisitor.INSTANCE, src);
+      // END REGULAR
+    }
+
     @Override
     public MessageType getDefaultInstanceForType() {
       return defaultInstance;
     }
 
     @Override
+    public BuilderType mergeFrom(byte[] input, int offset, int length)
+        throws InvalidProtocolBufferException {
+      // BEGIN REGULAR
+      return super.mergeFrom(input, offset, length);
+      // END REGULAR
+      // BEGIN EXPERIMENTAL
+      // copyOnWrite();
+      // try {
+      //   Protobuf.getInstance().schemaFor(instance).mergeFrom(
+      //       instance, input, offset, offset + length, new ArrayDecoders.Registers());
+      // } catch (InvalidProtocolBufferException e) {
+      //   throw e;
+      // } catch (IndexOutOfBoundsException e) {
+      //   throw InvalidProtocolBufferException.truncatedMessage();
+      // } catch (IOException e) {
+      //   throw new RuntimeException("Reading from byte array should not throw IOException.", e);
+      // }
+      // return (BuilderType) this;
+      // END EXPERIMENTAL
+    }
+
+    @Override
     public BuilderType mergeFrom(
         com.google.protobuf.CodedInputStream input,
         com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws IOException {
       copyOnWrite();
       try {
+        // BEGIN REGULAR
         instance.dynamicMethod(MethodToInvoke.MERGE_FROM_STREAM, input, extensionRegistry);
+        // END REGULAR
+        // BEGIN EXPERIMENTAL
+        // Protobuf.getInstance().schemaFor(instance).mergeFrom(
+        //     instance, CodedInputStreamReader.forCodedInput(input), extensionRegistry);
+        // END EXPERIMENTAL
       } catch (RuntimeException e) {
         if (e.getCause() instanceof IOException) {
           throw (IOException) e.getCause();
@@ -447,12 +546,10 @@ public abstract class GeneratedMessageLite<
             extends GeneratedMessageLite<MessageType, BuilderType>
             implements ExtendableMessageOrBuilder<MessageType, BuilderType> {
 
-    /**
-     * Represents the set of extensions on this message. For use by generated
-     * code only.
-     */
-    protected FieldSet<ExtensionDescriptor> extensions = FieldSet.newFieldSet();
+    /** Represents the set of extensions on this message. For use by generated code only. */
+    protected FieldSet<ExtensionDescriptor> extensions = FieldSet.emptySet();
 
+    @SuppressWarnings("unchecked")
     protected final void mergeExtensionFields(final MessageType other) {
       if (extensions.isImmutable()) {
         extensions = extensions.clone();
@@ -460,11 +557,13 @@ public abstract class GeneratedMessageLite<
       extensions.mergeFrom(((ExtendableMessage) other).extensions);
     }
 
+    // BEGIN REGULAR
     @Override
     final void visit(Visitor visitor, MessageType other) {
       super.visit(visitor, other);
       extensions = visitor.visitExtensions(extensions, other.extensions);
     }
+    // END REGULAR
 
     /**
      * Parse an unknown field or an extension. For use by generated code only.
@@ -477,7 +576,8 @@ public abstract class GeneratedMessageLite<
         MessageType defaultInstance,
         CodedInputStream input,
         ExtensionRegistryLite extensionRegistry,
-        int tag) throws IOException {
+        int tag)
+        throws IOException {
       int fieldNumber = WireFormat.getTagFieldNumber(tag);
 
       // TODO(dweis): How much bytecode would be saved by not requiring the generated code to
@@ -517,7 +617,9 @@ public abstract class GeneratedMessageLite<
       if (unknown) {  // Unknown field or wrong wire type.  Skip.
         return parseUnknownField(tag, input);
       }
-      
+
+      ensureExtensionsAreMutable();
+
       if (packed) {
         int length = input.readRawVarint32();
         int limit = input.pushLimit(length);
@@ -732,10 +834,18 @@ public abstract class GeneratedMessageLite<
       if (subBuilder == null) {
         subBuilder = extension.getMessageDefaultInstance().newBuilderForType();
       }
-      rawBytes.newCodedInput().readMessage(subBuilder, extensionRegistry);
+      subBuilder.mergeFrom(rawBytes, extensionRegistry);
       MessageLite value = subBuilder.build();
 
-      extensions.setField(extension.descriptor, extension.singularToFieldSetType(value));
+      ensureExtensionsAreMutable().setField(
+          extension.descriptor, extension.singularToFieldSetType(value));
+    }
+
+    private FieldSet<ExtensionDescriptor> ensureExtensionsAreMutable() {
+      if (extensions.isImmutable()) {
+        extensions = extensions.clone();
+      }
+      return extensions;
     }
 
     private void verifyExtensionContainingType(
@@ -807,10 +917,12 @@ public abstract class GeneratedMessageLite<
     @Override
     protected final void makeImmutable() {
       super.makeImmutable();
-
+      // BEGIN REGULAR
       extensions.makeImmutable();
+      // END REGULAR
     }
 
+
     /**
      * Used by subclasses to serialize extensions.  Extension ranges may be
      * interleaved with field numbers, but we must write them in canonical
@@ -881,12 +993,6 @@ public abstract class GeneratedMessageLite<
       implements ExtendableMessageOrBuilder<MessageType, BuilderType> {
     protected ExtendableBuilder(MessageType defaultInstance) {
       super(defaultInstance);
-
-      // TODO(dweis): This is kind of an unnecessary clone since we construct a
-      //     new instance in the parent constructor which makes the extensions
-      //     immutable. This extra allocation shouldn't matter in practice
-      //     though.
-      instance.extensions = instance.extensions.clone();
     }
 
     // For immutable message conversion.
@@ -905,6 +1011,15 @@ public abstract class GeneratedMessageLite<
       instance.extensions = instance.extensions.clone();
     }
 
+    private FieldSet<ExtensionDescriptor> ensureExtensionsAreMutable() {
+      FieldSet<ExtensionDescriptor> extensions = instance.extensions;
+      if (extensions.isImmutable()) {
+        extensions = extensions.clone();
+        instance.extensions = extensions;
+      }
+      return extensions;
+    }
+
     @Override
     public final MessageType buildPartial() {
       if (isBuilt) {
@@ -963,7 +1078,8 @@ public abstract class GeneratedMessageLite<
 
       verifyExtensionContainingType(extensionLite);
       copyOnWrite();
-      instance.extensions.setField(extensionLite.descriptor, extensionLite.toFieldSetType(value));
+      ensureExtensionsAreMutable()
+          .setField(extensionLite.descriptor, extensionLite.toFieldSetType(value));
       return (BuilderType) this;
     }
 
@@ -976,8 +1092,9 @@ public abstract class GeneratedMessageLite<
 
       verifyExtensionContainingType(extensionLite);
       copyOnWrite();
-      instance.extensions.setRepeatedField(
-          extensionLite.descriptor, index, extensionLite.singularToFieldSetType(value));
+      ensureExtensionsAreMutable()
+          .setRepeatedField(
+              extensionLite.descriptor, index, extensionLite.singularToFieldSetType(value));
       return (BuilderType) this;
     }
 
@@ -990,8 +1107,8 @@ public abstract class GeneratedMessageLite<
 
       verifyExtensionContainingType(extensionLite);
       copyOnWrite();
-      instance.extensions.addRepeatedField(
-          extensionLite.descriptor, extensionLite.singularToFieldSetType(value));
+      ensureExtensionsAreMutable()
+          .addRepeatedField(extensionLite.descriptor, extensionLite.singularToFieldSetType(value));
       return (BuilderType) this;
     }
 
@@ -1002,7 +1119,7 @@ public abstract class GeneratedMessageLite<
 
       verifyExtensionContainingType(extensionLite);
       copyOnWrite();
-      instance.extensions.clearField(extensionLite.descriptor);
+      ensureExtensionsAreMutable().clearField(extensionLite.descriptor);
       return (BuilderType) this;
     }
   }
@@ -1152,6 +1269,7 @@ public abstract class GeneratedMessageLite<
     }
   }
 
+
   /**
    * Lite equivalent to {@link GeneratedMessage.GeneratedExtension}.
    *
@@ -1392,11 +1510,26 @@ public abstract class GeneratedMessageLite<
    */
   protected static final <T extends GeneratedMessageLite<T, ?>> boolean isInitialized(
       T message, boolean shouldMemoize) {
-    return message.dynamicMethod(MethodToInvoke.IS_INITIALIZED, shouldMemoize) != null;
-  }
-
-  protected static final <T extends GeneratedMessageLite<T, ?>> void makeImmutable(T message) {
-    message.dynamicMethod(MethodToInvoke.MAKE_IMMUTABLE);
+    byte memoizedIsInitialized =
+        (Byte) message.dynamicMethod(MethodToInvoke.GET_MEMOIZED_IS_INITIALIZED);
+    if (memoizedIsInitialized == 1) {
+      return true;
+    }
+    if (memoizedIsInitialized == 0) {
+      return false;
+    }
+    // BEGIN EXPERIMENTAL
+    // boolean isInitialized = Protobuf.getInstance().schemaFor(message).isInitialized(message);
+    // END EXPERIMENTAL
+    // BEGIN REGULAR
+    boolean isInitialized =
+        message.dynamicMethod(MethodToInvoke.IS_INITIALIZED, Boolean.FALSE) != null;
+    // END REGULAR
+    if (shouldMemoize) {
+      message.dynamicMethod(
+          MethodToInvoke.SET_MEMOIZED_IS_INITIALIZED, isInitialized ? message : null);
+    }
+    return isInitialized;
   }
 
   protected static IntList emptyIntList() {
@@ -1478,6 +1611,11 @@ public abstract class GeneratedMessageLite<
         throws InvalidProtocolBufferException {
       return GeneratedMessageLite.parsePartialFrom(defaultInstance, input, extensionRegistry);
     }
+
+    @Override
+    public T parsePartialFrom(byte[] input) throws InvalidProtocolBufferException {
+      return GeneratedMessageLite.parsePartialFrom(defaultInstance, input);
+    }
   }
 
   /**
@@ -1491,8 +1629,21 @@ public abstract class GeneratedMessageLite<
     @SuppressWarnings("unchecked") // Guaranteed by protoc
     T result = (T) instance.dynamicMethod(MethodToInvoke.NEW_MUTABLE_INSTANCE);
     try {
+      // BEGIN REGULAR
       result.dynamicMethod(MethodToInvoke.MERGE_FROM_STREAM, input, extensionRegistry);
+      // END REGULAR
+      // BEGIN EXPERIMENTAL
+      // Protobuf.getInstance().schemaFor(result).mergeFrom(
+      //     result, CodedInputStreamReader.forCodedInput(input), extensionRegistry);
+      // END EXPERIMENTAL
       result.makeImmutable();
+      // BEGIN EXPERIMENTAL
+      // } catch (IOException e) {
+      //   if (e.getCause() instanceof InvalidProtocolBufferException) {
+      //     throw (InvalidProtocolBufferException) e.getCause();
+      //   }
+      //   throw new InvalidProtocolBufferException(e.getMessage()).setUnfinishedMessage(result);
+      // END EXPERIMENTAL
     } catch (RuntimeException e) {
       if (e.getCause() instanceof InvalidProtocolBufferException) {
         throw (InvalidProtocolBufferException) e.getCause();
@@ -1502,6 +1653,34 @@ public abstract class GeneratedMessageLite<
     return result;
   }
 
+  /** A static helper method for parsing a partial from byte array. */
+  static <T extends GeneratedMessageLite<T, ?>> T parsePartialFrom(T instance, byte[] input)
+      throws InvalidProtocolBufferException {
+    // BEGIN REGULAR
+    return parsePartialFrom(instance, input, ExtensionRegistryLite.getEmptyRegistry());
+    // END REGULAR
+    // BEGIN EXPERIMENTAL
+    // @SuppressWarnings("unchecked") // Guaranteed by protoc
+    // T result = (T) instance.dynamicMethod(MethodToInvoke.NEW_MUTABLE_INSTANCE);
+    // try {
+    //   Protobuf.getInstance().schemaFor(result).mergeFrom(
+    //       result, input, 0, input.length, new ArrayDecoders.Registers());
+    //   result.makeImmutable();
+    //   if (result.memoizedHashCode != 0) {
+    //     throw new RuntimeException();
+    //   }
+    // } catch (IOException e) {
+    //   if (e.getCause() instanceof InvalidProtocolBufferException) {
+    //     throw (InvalidProtocolBufferException) e.getCause();
+    //   }
+    //   throw new InvalidProtocolBufferException(e.getMessage()).setUnfinishedMessage(result);
+    // } catch (IndexOutOfBoundsException e) {
+    //   throw InvalidProtocolBufferException.truncatedMessage().setUnfinishedMessage(result);
+    // }
+    // return result;
+    // END EXPERIMENTAL
+  }
+
   protected static <T extends GeneratedMessageLite<T, ?>> T parsePartialFrom(
       T defaultInstance,
       CodedInputStream input)
@@ -1527,6 +1706,20 @@ public abstract class GeneratedMessageLite<
 
   // Validates last tag.
   protected static <T extends GeneratedMessageLite<T, ?>> T parseFrom(
+      T defaultInstance, ByteBuffer data, ExtensionRegistryLite extensionRegistry)
+      throws InvalidProtocolBufferException {
+    return checkMessageInitialized(
+        parseFrom(defaultInstance, CodedInputStream.newInstance(data), extensionRegistry));
+  }
+
+  // Validates last tag.
+  protected static <T extends GeneratedMessageLite<T, ?>> T parseFrom(
+      T defaultInstance, ByteBuffer data) throws InvalidProtocolBufferException {
+    return parseFrom(defaultInstance, data, ExtensionRegistryLite.getEmptyRegistry());
+  }
+
+  // Validates last tag.
+  protected static <T extends GeneratedMessageLite<T, ?>> T parseFrom(
       T defaultInstance, ByteString data)
       throws InvalidProtocolBufferException {
     return checkMessageInitialized(
@@ -1584,8 +1777,7 @@ public abstract class GeneratedMessageLite<
   protected static <T extends GeneratedMessageLite<T, ?>> T parseFrom(
       T defaultInstance, byte[] data)
       throws InvalidProtocolBufferException {
-    return checkMessageInitialized(
-        parsePartialFrom(defaultInstance, data, ExtensionRegistryLite.getEmptyRegistry()));
+    return checkMessageInitialized(parsePartialFrom(defaultInstance, data));
   }
 
   // Validates last tag.
@@ -1670,6 +1862,7 @@ public abstract class GeneratedMessageLite<
     return message;
   }
 
+  // BEGIN REGULAR
   /**
    * An abstract visitor that the generated code calls into that we use to implement various
    * features. Fields that are not members of oneofs are always visited. Members of a oneof are only
@@ -1693,7 +1886,6 @@ public abstract class GeneratedMessageLite<
     Object visitOneofLong(boolean minePresent, Object mine, Object other);
     Object visitOneofString(boolean minePresent, Object mine, Object other);
     Object visitOneofByteString(boolean minePresent, Object mine, Object other);
-    Object visitOneofLazyMessage(boolean minePresent, Object mine, Object other);
     Object visitOneofMessage(boolean minePresent, Object mine, Object other);
     void visitOneofNotSet(boolean minePresent);
 
@@ -1701,7 +1893,6 @@ public abstract class GeneratedMessageLite<
      * Message fields use null sentinals.
      */
     <T extends MessageLite> T visitMessage(T mine, T other);
-    LazyFieldLite visitLazyMessage(LazyFieldLite mine, LazyFieldLite other);
 
     <T> ProtobufList<T> visitList(ProtobufList<T> mine, ProtobufList<T> other);
     BooleanList visitBooleanList(BooleanList mine, BooleanList other);
@@ -1845,14 +2036,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public Object visitOneofLazyMessage(boolean minePresent, Object mine, Object other) {
-      if (minePresent && mine.equals(other)) {
-        return mine;
-      }
-      throw NOT_EQUALS;
-    }
-
-    @Override
     public Object visitOneofMessage(boolean minePresent, Object mine, Object other) {
       if (minePresent && ((GeneratedMessageLite<?, ?>) mine).equals(this, (MessageLite) other)) {
         return mine;
@@ -1883,21 +2066,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public LazyFieldLite visitLazyMessage(
-        LazyFieldLite mine, LazyFieldLite other) {
-      if (mine == null && other == null) {
-        return null;
-      }
-      if (mine == null || other == null) {
-        throw NOT_EQUALS;
-      }
-      if (mine.equals(other)) {
-        return mine;
-      }
-      throw NOT_EQUALS;
-    }
-
-    @Override
     public <T> ProtobufList<T> visitList(ProtobufList<T> mine, ProtobufList<T> other) {
       if (!mine.equals(other)) {
         throw NOT_EQUALS;
@@ -1977,13 +2145,13 @@ public abstract class GeneratedMessageLite<
   /**
    * Implements hashCode by accumulating state.
    */
-  private static class HashCodeVisitor implements Visitor {
+  static class HashCodeVisitor implements Visitor {
 
     // The caller must ensure that the visitor is invoked parameterized with this and this such that
     // other is this. This is required due to how oneof cases are handled. See the class comment
     // on Visitor for more information.
 
-    private int hashCode = 0;
+    int hashCode = 0;
 
     @Override
     public boolean visitBoolean(
@@ -2074,12 +2242,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public Object visitOneofLazyMessage(boolean minePresent, Object mine, Object other) {
-      hashCode = (53 * hashCode) + mine.hashCode();
-      return mine;
-    }
-
-    @Override
     public Object visitOneofMessage(boolean minePresent, Object mine, Object other) {
       return visitMessage((MessageLite) mine, (MessageLite) other);
     }
@@ -2108,18 +2270,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public LazyFieldLite visitLazyMessage(LazyFieldLite mine, LazyFieldLite other) {
-      final int protoHash;
-      if (mine != null) {
-        protoHash = mine.hashCode();
-      } else {
-        protoHash = 37;
-      }
-      hashCode = (53 * hashCode) + protoHash;
-      return mine;
-    }
-
-    @Override
     public <T> ProtobufList<T> visitList(ProtobufList<T> mine, ProtobufList<T> other) {
       hashCode = (53 * hashCode) + mine.hashCode();
       return mine;
@@ -2262,13 +2412,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public Object visitOneofLazyMessage(boolean minePresent, Object mine, Object other) {
-      LazyFieldLite lazy = minePresent ? (LazyFieldLite) mine : new LazyFieldLite();
-      lazy.merge((LazyFieldLite) other);
-      return lazy;
-    }
-
-    @Override
     public Object visitOneofMessage(boolean minePresent, Object mine, Object other) {
       if (minePresent) {
         return visitMessage((MessageLite) mine, (MessageLite) other);
@@ -2292,17 +2435,6 @@ public abstract class GeneratedMessageLite<
     }
 
     @Override
-    public LazyFieldLite visitLazyMessage(LazyFieldLite mine, LazyFieldLite other) {
-      if (other != null) {
-        if (mine == null) {
-          mine = new LazyFieldLite();
-        }
-        mine.merge(other);
-      }
-      return mine;
-    }
-
-    @Override
     public <T> ProtobufList<T> visitList(ProtobufList<T> mine, ProtobufList<T> other) {
       int size = mine.size();
       int otherSize = other.size();
@@ -2416,4 +2548,5 @@ public abstract class GeneratedMessageLite<
       return mine;
     }
   }
+  // END REGULAR
 }
diff --git a/java/core/src/main/java/com/google/protobuf/GeneratedMessageV3.java b/java/core/src/main/java/com/google/protobuf/GeneratedMessageV3.java
index 2a5d8b50..4acd8f2f 100644
--- a/java/core/src/main/java/com/google/protobuf/GeneratedMessageV3.java
+++ b/java/core/src/main/java/com/google/protobuf/GeneratedMessageV3.java
@@ -30,6 +30,8 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.EnumDescriptor;
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
@@ -41,13 +43,12 @@ import com.google.protobuf.Descriptors.OneofDescriptor;
 // class without breaking binary compatibility with old generated code that still subclasses
 // the old GeneratedMessageV3 class. To allow these different GeneratedMessageV3V? classes to
 // interoperate (e.g., a GeneratedMessageV3V3 object has a message extension field whose class
-// type is GeneratedMessageV3V4), these classes still share a common parent class AbstarctMessage
+// type is GeneratedMessageV3V4), these classes still share a common parent class AbstractMessage
 // and are using the same GeneratedMessage.GeneratedExtension class for extension definitions.
 // Since this class becomes GeneratedMessageV3V? in opensource, we have to add an import here
 // to be able to use GeneratedMessage.GeneratedExtension. The GeneratedExtension definition in
 // this file is also excluded from opensource to avoid conflict.
 import com.google.protobuf.GeneratedMessage.GeneratedExtension;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectStreamException;
@@ -277,13 +278,30 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
 
   /**
    * Called by subclasses to parse an unknown field.
+   *
    * @return {@code true} unless the tag is an end-group tag.
    */
   protected boolean parseUnknownField(
       CodedInputStream input,
       UnknownFieldSet.Builder unknownFields,
       ExtensionRegistryLite extensionRegistry,
-      int tag) throws IOException {
+      int tag)
+      throws IOException {
+    if (input.shouldDiscardUnknownFields()) {
+      return input.skipField(tag);
+    }
+    return unknownFields.mergeFieldFrom(tag, input);
+  }
+
+  protected boolean parseUnknownFieldProto3(
+      CodedInputStream input,
+      UnknownFieldSet.Builder unknownFields,
+      ExtensionRegistryLite extensionRegistry,
+      int tag)
+      throws IOException {
+    if (input.shouldDiscardUnknownFieldsProto3()) {
+      return input.skipField(tag);
+    }
     return unknownFields.mergeFieldFrom(tag, input);
   }
 
@@ -340,6 +358,10 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       throw e.unwrapIOException();
     }
   }
+  
+  protected static boolean canUseUnsafe() {
+    return UnsafeUtil.hasUnsafeArrayOperations() && UnsafeUtil.hasUnsafeByteBufferOperations();
+  }
 
   @Override
   public void writeTo(final CodedOutputStream output) throws IOException {
@@ -619,17 +641,25 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       return (BuilderType) this;
     }
 
+    protected BuilderType setUnknownFieldsProto3(final UnknownFieldSet unknownFields) {
+      if (CodedInputStream.getProto3DiscardUnknownFieldsDefault()) {
+        return (BuilderType) this;
+      }
+      this.unknownFields = unknownFields;
+      onChanged();
+      return (BuilderType) this;
+    }
+
     @Override
     public BuilderType mergeUnknownFields(
         final UnknownFieldSet unknownFields) {
-      this.unknownFields =
+      return setUnknownFields(
         UnknownFieldSet.newBuilder(this.unknownFields)
                        .mergeFrom(unknownFields)
-                       .build();
-      onChanged();
-      return (BuilderType) this;
+                       .build());
     }
 
+
     @Override
     public boolean isInitialized() {
       for (final FieldDescriptor field : getDescriptorForType().getFields()) {
@@ -666,18 +696,6 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
     }
 
     /**
-     * Called by subclasses to parse an unknown field.
-     * @return {@code true} unless the tag is an end-group tag.
-     */
-    protected boolean parseUnknownField(
-        final CodedInputStream input,
-        final UnknownFieldSet.Builder unknownFields,
-        final ExtensionRegistryLite extensionRegistry,
-        final int tag) throws IOException {
-      return unknownFields.mergeFieldFrom(tag, input);
-    }
-
-    /**
      * Implementation of {@link BuilderParent} for giving to our children. This
      * small inner class makes it so we don't publicly expose the BuilderParent
      * methods.
@@ -866,6 +884,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
 
     /** Check if a singular extension is present. */
     @Override
+    @SuppressWarnings("unchecked")
     public final <Type> boolean hasExtension(final ExtensionLite<MessageType, Type> extensionLite) {
       Extension<MessageType, Type> extension = checkNotLite(extensionLite);
 
@@ -875,6 +894,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
 
     /** Get the number of elements in a repeated extension. */
     @Override
+    @SuppressWarnings("unchecked")
     public final <Type> int getExtensionCount(
         final ExtensionLite<MessageType, List<Type>> extensionLite) {
       Extension<MessageType, List<Type>> extension = checkNotLite(extensionLite);
@@ -985,8 +1005,23 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
         ExtensionRegistryLite extensionRegistry,
         int tag) throws IOException {
       return MessageReflection.mergeFieldFrom(
-          input, unknownFields, extensionRegistry, getDescriptorForType(),
-          new MessageReflection.ExtensionAdapter(extensions), tag);
+          input, input.shouldDiscardUnknownFields() ? null : unknownFields, extensionRegistry,
+          getDescriptorForType(), new MessageReflection.ExtensionAdapter(extensions), tag);
+    }
+
+    @Override
+    protected boolean parseUnknownFieldProto3(
+        CodedInputStream input,
+        UnknownFieldSet.Builder unknownFields,
+        ExtensionRegistryLite extensionRegistry,
+        int tag) throws IOException {
+      return MessageReflection.mergeFieldFrom(
+          input,
+          input.shouldDiscardUnknownFieldsProto3() ? null : unknownFields,
+          extensionRegistry,
+          getDescriptorForType(),
+          new MessageReflection.ExtensionAdapter(extensions),
+          tag);
     }
 
 
@@ -1456,21 +1491,6 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       return super.isInitialized() && extensionsAreInitialized();
     }
 
-    /**
-     * Called by subclasses to parse an unknown field or an extension.
-     * @return {@code true} unless the tag is an end-group tag.
-     */
-    @Override
-    protected boolean parseUnknownField(
-        final CodedInputStream input,
-        final UnknownFieldSet.Builder unknownFields,
-        final ExtensionRegistryLite extensionRegistry,
-        final int tag) throws IOException {
-      return MessageReflection.mergeFieldFrom(
-          input, unknownFields, extensionRegistry, getDescriptorForType(),
-          new MessageReflection.BuilderAdapter(this), tag);
-    }
-
     // ---------------------------------------------------------------
     // Reflection
 
@@ -2219,6 +2239,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       }
 
       @Override
+      @SuppressWarnings("unchecked")
       public Object get(GeneratedMessageV3 message) {
         List result = new ArrayList();
         for (int i = 0; i < getRepeatedCount(message); i++) {
@@ -2228,6 +2249,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       }
 
       @Override
+      @SuppressWarnings("unchecked")
       public Object get(Builder builder) {
         List result = new ArrayList();
         for (int i = 0; i < getRepeatedCount(builder); i++) {
@@ -2273,7 +2295,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       public Object getRepeatedRaw(Builder builder, int index) {
         return getRepeated(builder, index);
       }
-      
+
       @Override
       public void setRepeated(Builder builder, int index, Object value) {
         getMutableMapField(builder).getMutableList().set(index, coerceType((Message) value));
@@ -2674,7 +2696,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
 
     return (Extension<MessageType, T>) extension;
   }
-  
+
   protected static int computeStringSize(final int fieldNumber, final Object value) {
     if (value instanceof String) {
       return CodedOutputStream.computeStringSize(fieldNumber, (String) value);
@@ -2682,7 +2704,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       return CodedOutputStream.computeBytesSize(fieldNumber, (ByteString) value);
     }
   }
-  
+
   protected static int computeStringSizeNoTag(final Object value) {
     if (value instanceof String) {
       return CodedOutputStream.computeStringSizeNoTag((String) value);
@@ -2690,7 +2712,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       return CodedOutputStream.computeBytesSizeNoTag((ByteString) value);
     }
   }
-  
+
   protected static void writeString(
       CodedOutputStream output, final int fieldNumber, final Object value) throws IOException {
     if (value instanceof String) {
@@ -2699,7 +2721,7 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
       output.writeBytes(fieldNumber, (ByteString) value);
     }
   }
-  
+
   protected static void writeStringNoTag(
       CodedOutputStream output, final Object value) throws IOException {
     if (value instanceof String) {
@@ -2836,3 +2858,4 @@ public abstract class GeneratedMessageV3 extends AbstractMessage
     }
   }
 }
+
diff --git a/java/core/src/main/java/com/google/protobuf/IntArrayList.java b/java/core/src/main/java/com/google/protobuf/IntArrayList.java
index 2f526e3f..aacd71e1 100644
--- a/java/core/src/main/java/com/google/protobuf/IntArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/IntArrayList.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.IntList;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.IntList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.RandomAccess;
@@ -41,9 +42,8 @@ import java.util.RandomAccess;
  *
  * @author dweis@google.com (Daniel Weis)
  */
-final class IntArrayList
-    extends AbstractProtobufList<Integer>
-    implements IntList, RandomAccess {
+final class IntArrayList extends AbstractProtobufList<Integer>
+    implements IntList, RandomAccess, PrimitiveNonBoxingCollection {
 
   private static final IntArrayList EMPTY_LIST = new IntArrayList();
   static {
@@ -82,6 +82,18 @@ final class IntArrayList
   }
 
   @Override
+  protected void removeRange(int fromIndex, int toIndex) {
+    ensureIsMutable();
+    if (toIndex < fromIndex) {
+      throw new IndexOutOfBoundsException("toIndex < fromIndex");
+    }
+
+    System.arraycopy(array, toIndex, array, fromIndex, size - toIndex);
+    size -= (toIndex - fromIndex);
+    modCount++;
+  }
+
+  @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
@@ -198,9 +210,7 @@ final class IntArrayList
   public boolean addAll(Collection<? extends Integer> collection) {
     ensureIsMutable();
 
-    if (collection == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(collection);
 
     // We specialize when adding another IntArrayList to avoid boxing elements.
     if (!(collection instanceof IntArrayList)) {
@@ -248,7 +258,9 @@ final class IntArrayList
     ensureIsMutable();
     ensureIndexInRange(index);
     int value = array[index];
-    System.arraycopy(array, index + 1, array, index, size - index);
+    if (index < size - 1) {
+      System.arraycopy(array, index + 1, array, index, size - index);
+    }
     size--;
     modCount++;
     return value;
diff --git a/java/core/src/main/java/com/google/protobuf/Internal.java b/java/core/src/main/java/com/google/protobuf/Internal.java
index c234559c..848cad03 100644
--- a/java/core/src/main/java/com/google/protobuf/Internal.java
+++ b/java/core/src/main/java/com/google/protobuf/Internal.java
@@ -62,6 +62,16 @@ public final class Internal {
   /**
    * Throws an appropriate {@link NullPointerException} if the given objects is {@code null}.
    */
+  static <T> T checkNotNull(T obj) {
+    if (obj == null) {
+      throw new NullPointerException();
+    }
+    return obj;
+  }
+
+  /**
+   * Throws an appropriate {@link NullPointerException} if the given objects is {@code null}.
+   */
   static <T> T checkNotNull(T obj, String message) {
     if (obj == null) {
       throw new NullPointerException(message);
@@ -404,9 +414,8 @@ public final class Internal {
     }
   }
 
-  /**
-   * An empty byte array constant used in generated code.
-   */
+
+  /** An empty byte array constant used in generated code. */
   public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
 
   /**
@@ -420,6 +429,11 @@ public final class Internal {
       CodedInputStream.newInstance(EMPTY_BYTE_ARRAY);
 
 
+  /** Helper method to merge two MessageLite instances. */
+  static Object mergeMessage(Object destination, Object source) {
+    return ((MessageLite) destination).toBuilder().mergeFrom((MessageLite) source).buildPartial();
+  }
+
   /**
    * Provides an immutable view of {@code List<T>} around a {@code List<F>}.
    *
diff --git a/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java b/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
index 55e33d21..510c6aac 100644
--- a/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
+++ b/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
@@ -50,6 +50,10 @@ public class InvalidProtocolBufferException extends IOException {
     super(e.getMessage(), e);
   }
 
+  public InvalidProtocolBufferException(final String description, IOException e) {
+    super(description, e);
+  }
+
   /**
    * Attaches an unfinished message to the exception to support best-effort
    * parsing in {@code Parser} interface.
diff --git a/java/core/src/main/java/com/google/protobuf/IterableByteBufferInputStream.java b/java/core/src/main/java/com/google/protobuf/IterableByteBufferInputStream.java
new file mode 100644
index 00000000..713e8064
--- /dev/null
+++ b/java/core/src/main/java/com/google/protobuf/IterableByteBufferInputStream.java
@@ -0,0 +1,150 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import static com.google.protobuf.Internal.EMPTY_BYTE_BUFFER;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.Iterator;
+
+class IterableByteBufferInputStream extends InputStream {
+  /** The {@link Iterator} with type {@link ByteBuffer} of {@code input} */
+  private Iterator<ByteBuffer> iterator;
+  /** The current ByteBuffer; */
+  private ByteBuffer currentByteBuffer;
+  /** The number of ByteBuffers in the input data. */
+  private int dataSize;
+  /**
+   * Current {@code ByteBuffer}'s index
+   *
+   * <p>If index equals dataSize, then all the data in the InputStream has been consumed
+   */
+  private int currentIndex;
+  /** The current position for current ByteBuffer */
+  private int currentByteBufferPos;
+  /** Whether current ByteBuffer has an array */
+  private boolean hasArray;
+  /**
+   * If the current ByteBuffer is unsafe-direct based, currentArray is null; otherwise should be the
+   * array inside ByteBuffer.
+   */
+  private byte[] currentArray;
+  /** Current ByteBuffer's array offset */
+  private int currentArrayOffset;
+  /**
+   * If the current ByteBuffer is unsafe-direct based, currentAddress is the start address of this
+   * ByteBuffer; otherwise should be zero.
+   */
+  private long currentAddress;
+
+  IterableByteBufferInputStream(Iterable<ByteBuffer> data) {
+    iterator = data.iterator();
+    dataSize = 0;
+    for (ByteBuffer unused : data) {
+      dataSize++;
+    }
+    currentIndex = -1;
+
+    if (!getNextByteBuffer()) {
+      currentByteBuffer = EMPTY_BYTE_BUFFER;
+      currentIndex = 0;
+      currentByteBufferPos = 0;
+      currentAddress = 0;
+    }
+  }
+
+  private boolean getNextByteBuffer() {
+    currentIndex++;
+    if (!iterator.hasNext()) {
+      return false;
+    }
+    currentByteBuffer = iterator.next();
+    currentByteBufferPos = currentByteBuffer.position();
+    if (currentByteBuffer.hasArray()) {
+      hasArray = true;
+      currentArray = currentByteBuffer.array();
+      currentArrayOffset = currentByteBuffer.arrayOffset();
+    } else {
+      hasArray = false;
+      currentAddress = UnsafeUtil.addressOffset(currentByteBuffer);
+      currentArray = null;
+    }
+    return true;
+  }
+
+  private void updateCurrentByteBufferPos(int numberOfBytesRead) {
+    currentByteBufferPos += numberOfBytesRead;
+    if (currentByteBufferPos == currentByteBuffer.limit()) {
+      getNextByteBuffer();
+    }
+  }
+
+  @Override
+  public int read() throws IOException {
+    if (currentIndex == dataSize) {
+      return -1;
+    }
+    if (hasArray) {
+      int result = currentArray[currentByteBufferPos + currentArrayOffset] & 0xFF;
+      updateCurrentByteBufferPos(1);
+      return result;
+    } else {
+      int result = UnsafeUtil.getByte(currentByteBufferPos + currentAddress) & 0xFF;
+      updateCurrentByteBufferPos(1);
+      return result;
+    }
+  }
+
+  @Override
+  public int read(byte[] output, int offset, int length) throws IOException {
+    if (currentIndex == dataSize) {
+      return -1;
+    }
+    int remaining = currentByteBuffer.limit() - currentByteBufferPos;
+    if (length > remaining) {
+      length = remaining;
+    }
+    if (hasArray) {
+      System.arraycopy(
+          currentArray, currentByteBufferPos + currentArrayOffset, output, offset, length);
+      updateCurrentByteBufferPos(length);
+    } else {
+      int prevPos = currentByteBuffer.position();
+      currentByteBuffer.position(currentByteBufferPos);
+      currentByteBuffer.get(output, offset, length);
+      currentByteBuffer.position(prevPos);
+      updateCurrentByteBufferPos(length);
+    }
+    return length;
+  }
+}
diff --git a/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java b/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java
index 4b0ba0fd..49ecfc0b 100644
--- a/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java
+++ b/java/core/src/main/java/com/google/protobuf/LazyFieldLite.java
@@ -394,6 +394,7 @@ public class LazyFieldLite {
     }
   }
 
+
   /**
    * Might lazily parse the bytes that were previously passed in. Is thread-safe.
    */
diff --git a/java/core/src/main/java/com/google/protobuf/LongArrayList.java b/java/core/src/main/java/com/google/protobuf/LongArrayList.java
index 5a772e3a..95945cb7 100644
--- a/java/core/src/main/java/com/google/protobuf/LongArrayList.java
+++ b/java/core/src/main/java/com/google/protobuf/LongArrayList.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.LongList;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.LongList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.RandomAccess;
@@ -41,9 +42,8 @@ import java.util.RandomAccess;
  *
  * @author dweis@google.com (Daniel Weis)
  */
-final class LongArrayList
-    extends AbstractProtobufList<Long>
-    implements LongList, RandomAccess {
+final class LongArrayList extends AbstractProtobufList<Long>
+    implements LongList, RandomAccess, PrimitiveNonBoxingCollection {
 
   private static final LongArrayList EMPTY_LIST = new LongArrayList();
   static {
@@ -82,6 +82,18 @@ final class LongArrayList
   }
 
   @Override
+  protected void removeRange(int fromIndex, int toIndex) {
+    ensureIsMutable();
+    if (toIndex < fromIndex) {
+      throw new IndexOutOfBoundsException("toIndex < fromIndex");
+    }
+
+    System.arraycopy(array, toIndex, array, fromIndex, size - toIndex);
+    size -= (toIndex - fromIndex);
+    modCount++;
+  }
+
+  @Override
   public boolean equals(Object o) {
     if (this == o) {
       return true;
@@ -198,9 +210,7 @@ final class LongArrayList
   public boolean addAll(Collection<? extends Long> collection) {
     ensureIsMutable();
 
-    if (collection == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(collection);
 
     // We specialize when adding another LongArrayList to avoid boxing elements.
     if (!(collection instanceof LongArrayList)) {
@@ -248,7 +258,9 @@ final class LongArrayList
     ensureIsMutable();
     ensureIndexInRange(index);
     long value = array[index];
-    System.arraycopy(array, index + 1, array, index, size - index);
+    if (index < size - 1) {
+      System.arraycopy(array, index + 1, array, index, size - index);
+    }
     size--;
     modCount++;
     return value;
diff --git a/java/core/src/main/java/com/google/protobuf/MapEntry.java b/java/core/src/main/java/com/google/protobuf/MapEntry.java
index 179c3348..0849b821 100644
--- a/java/core/src/main/java/com/google/protobuf/MapEntry.java
+++ b/java/core/src/main/java/com/google/protobuf/MapEntry.java
@@ -33,7 +33,6 @@ package com.google.protobuf;
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
-
 import java.io.IOException;
 import java.util.Collections;
 import java.util.Map;
@@ -89,6 +88,7 @@ public final class MapEntry<K, V> extends AbstractMessage {
   }
 
   /** Create a MapEntry with the provided key and value. */
+  @SuppressWarnings("unchecked")
   private MapEntry(Metadata metadata, K key, V value) {
     this.key = key;
     this.value = value;
@@ -170,7 +170,7 @@ public final class MapEntry<K, V> extends AbstractMessage {
 
   @Override
   public Builder<K, V> toBuilder() {
-    return new Builder<K, V>(metadata, key, value);
+    return new Builder<K, V>(metadata, key, value, true, true);
   }
 
   @Override
@@ -246,15 +246,19 @@ public final class MapEntry<K, V> extends AbstractMessage {
     private final Metadata<K, V> metadata;
     private K key;
     private V value;
+    private boolean hasKey;
+    private boolean hasValue;
 
     private Builder(Metadata<K, V> metadata) {
-      this(metadata, metadata.defaultKey, metadata.defaultValue);
+      this(metadata, metadata.defaultKey, metadata.defaultValue, false, false);
     }
 
-    private Builder(Metadata<K, V> metadata, K key, V value) {
+    private Builder(Metadata<K, V> metadata, K key, V value, boolean hasKey, boolean hasValue) {
       this.metadata = metadata;
       this.key = key;
       this.value = value;
+      this.hasKey = hasKey;
+      this.hasValue = hasValue;
     }
 
     public K getKey() {
@@ -267,21 +271,25 @@ public final class MapEntry<K, V> extends AbstractMessage {
 
     public Builder<K, V> setKey(K key) {
       this.key = key;
+      this.hasKey = true;
       return this;
     }
 
     public Builder<K, V> clearKey() {
       this.key = metadata.defaultKey;
+      this.hasKey = false;
       return this;
     }
 
     public Builder<K, V> setValue(V value) {
       this.value = value;
+      this.hasValue = true;
       return this;
     }
 
     public Builder<K, V> clearValue() {
       this.value = metadata.defaultValue;
+      this.hasValue = false;
       return this;
     }
 
@@ -403,7 +411,7 @@ public final class MapEntry<K, V> extends AbstractMessage {
     @Override
     public boolean hasField(FieldDescriptor field) {
       checkFieldDescriptor(field);
-      return true;
+      return field.getNumber() == 1 ? hasKey : hasValue;
     }
 
     @Override
@@ -435,8 +443,9 @@ public final class MapEntry<K, V> extends AbstractMessage {
     }
 
     @Override
+    @SuppressWarnings("unchecked")
     public Builder<K, V> clone() {
-      return new Builder(metadata, key, value);
+      return new Builder(metadata, key, value, hasKey, hasValue);
     }
   }
 
@@ -446,4 +455,9 @@ public final class MapEntry<K, V> extends AbstractMessage {
     }
     return true;
   }
+  
+  /** Returns the metadata only for experimental runtime. */
+  final Metadata<K, V> getMetadata() {
+    return metadata;
+  }
 }
diff --git a/java/core/src/main/java/com/google/protobuf/MapEntryLite.java b/java/core/src/main/java/com/google/protobuf/MapEntryLite.java
index 22aef8f9..dcb5dfad 100644
--- a/java/core/src/main/java/com/google/protobuf/MapEntryLite.java
+++ b/java/core/src/main/java/com/google/protobuf/MapEntryLite.java
@@ -223,4 +223,9 @@ public class MapEntryLite<K, V> {
     input.popLimit(oldLimit);
     map.put(key, value);
   }
+
+  /** For experimental runtime internal use only. */
+  Metadata<K, V> getMetadata() {
+    return metadata;
+  }
 }
diff --git a/java/core/src/main/java/com/google/protobuf/MapField.java b/java/core/src/main/java/com/google/protobuf/MapField.java
index a6109f98..ad8ceb02 100644
--- a/java/core/src/main/java/com/google/protobuf/MapField.java
+++ b/java/core/src/main/java/com/google/protobuf/MapField.java
@@ -30,6 +30,8 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -100,6 +102,7 @@ public class MapField<K, V> implements MutabilityOracle {
     }
 
     @Override
+    @SuppressWarnings("unchecked")
     public void convertMessageToKeyAndValue(Message message, Map<K, V> map) {
       MapEntry<K, V> entry = (MapEntry<K, V>) message;
       map.put(entry.getKey(), entry.getValue());
@@ -328,6 +331,8 @@ public class MapField<K, V> implements MutabilityOracle {
     @Override
     public V put(K key, V value) {
       mutabilityOracle.ensureMutable();
+      checkNotNull(key);
+      checkNotNull(value);
       return delegate.put(key, value);
     }
 
@@ -340,6 +345,10 @@ public class MapField<K, V> implements MutabilityOracle {
     @Override
     public void putAll(Map<? extends K, ? extends V> m) {
       mutabilityOracle.ensureMutable();
+      for (K key : m.keySet()) {
+        checkNotNull(key);
+        checkNotNull(m.get(key));
+      }
       delegate.putAll(m);
     }
 
diff --git a/java/core/src/main/java/com/google/protobuf/MapFieldLite.java b/java/core/src/main/java/com/google/protobuf/MapFieldLite.java
index 42640279..a8b3dd88 100644
--- a/java/core/src/main/java/com/google/protobuf/MapFieldLite.java
+++ b/java/core/src/main/java/com/google/protobuf/MapFieldLite.java
@@ -30,8 +30,9 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.Internal.EnumLite;
+import static com.google.protobuf.Internal.checkNotNull;
 
+import com.google.protobuf.Internal.EnumLite;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.LinkedHashMap;
@@ -88,6 +89,9 @@ public final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
 
   @Override public V put(K key, V value) {
     ensureMutable();
+    checkNotNull(key);
+
+    checkNotNull(value);
     return super.put(key, value);
   }
 
@@ -97,6 +101,7 @@ public final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
 
   @Override public void putAll(Map<? extends K, ? extends V> m) {
     ensureMutable();
+    checkForNullKeysAndValues(m);
     super.putAll(m);
   }
 
@@ -105,6 +110,13 @@ public final class MapFieldLite<K, V> extends LinkedHashMap<K, V> {
     return super.remove(key);
   }
 
+  private static void checkForNullKeysAndValues(Map<?, ?> m) {
+    for (Object key : m.keySet()) {
+      checkNotNull(key);
+      checkNotNull(m.get(key));
+    }
+  }
+
   private static boolean equals(Object a, Object b) {
     if (a instanceof byte[] && b instanceof byte[]) {
       return Arrays.equals((byte[]) a, (byte[]) b);
diff --git a/java/core/src/main/java/com/google/protobuf/Message.java b/java/core/src/main/java/com/google/protobuf/Message.java
index 94590fb9..0770d417 100644
--- a/java/core/src/main/java/com/google/protobuf/Message.java
+++ b/java/core/src/main/java/com/google/protobuf/Message.java
@@ -125,7 +125,7 @@ public interface Message extends MessageLite, MessageOrBuilder {
      *   it is merged into the corresponding sub-message of this message
      *   using the same merging rules.<br>
      * * For repeated fields, the elements in {@code other} are concatenated
-     *   with the elements in this message.
+     *   with the elements in this message.<br>
      * * For oneof groups, if the other message has one of the fields set,
      *   the group of this message is cleared and replaced by the field
      *   of the other message, so that the oneof constraint is preserved.
diff --git a/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java b/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java
index 23373ef4..8e265935 100644
--- a/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageLiteToString.java
@@ -31,6 +31,7 @@
 package com.google.protobuf;
 
 import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
@@ -38,20 +39,18 @@ import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
 
-/**
- * Helps generate {@link String} representations of {@link MessageLite} protos.
- */
-// TODO(dweis): Fix map fields.
+/** Helps generate {@link String} representations of {@link MessageLite} protos. */
 final class MessageLiteToString {
 
   private static final String LIST_SUFFIX = "List";
   private static final String BUILDER_LIST_SUFFIX = "OrBuilderList";
+  private static final String MAP_SUFFIX = "Map";
   private static final String BYTES_SUFFIX = "Bytes";
-  
+
   /**
-   * Returns a {@link String} representation of the {@link MessageLite} object.  The first line of
+   * Returns a {@link String} representation of the {@link MessageLite} object. The first line of
    * the {@code String} representation representation includes a comment string to uniquely identify
-   * the objcet instance. This acts as an indicator that this should not be relied on for
+   * the object instance. This acts as an indicator that this should not be relied on for
    * comparisons.
    *
    * <p>For use by generated code only.
@@ -71,8 +70,9 @@ final class MessageLiteToString {
    */
   private static void reflectivePrintWithIndent(
       MessageLite messageLite, StringBuilder buffer, int indent) {
-    // Build a map of method name to method. We're looking for methods like getFoo(), hasFoo(), and
-    // getFooList() which might be useful for building an object's string representation.
+    // Build a map of method name to method. We're looking for methods like getFoo(), hasFoo(),
+    // getFooList() and getFooMap() which might be useful for building an object's string
+    // representation.
     Map<String, Method> nameToNoArgMethod = new HashMap<String, Method>();
     Map<String, Method> nameToMethod = new HashMap<String, Method>();
     Set<String> getters = new TreeSet<String>();
@@ -89,12 +89,16 @@ final class MessageLiteToString {
 
     for (String getter : getters) {
       String suffix = getter.replaceFirst("get", "");
-      if (suffix.endsWith(LIST_SUFFIX) && !suffix.endsWith(BUILDER_LIST_SUFFIX)) {
-        String camelCase = suffix.substring(0, 1).toLowerCase()
-            + suffix.substring(1, suffix.length() - LIST_SUFFIX.length());
+      if (suffix.endsWith(LIST_SUFFIX)
+          && !suffix.endsWith(BUILDER_LIST_SUFFIX)
+          // Sometimes people have fields named 'list' that aren't repeated.
+          && !suffix.equals(LIST_SUFFIX)) {
+        String camelCase =
+            suffix.substring(0, 1).toLowerCase()
+                + suffix.substring(1, suffix.length() - LIST_SUFFIX.length());
         // Try to reflectively get the value and toString() the field as if it were repeated. This
-        // only works if the method names have not be proguarded out or renamed.
-        Method listMethod = nameToNoArgMethod.get("get" + suffix);
+        // only works if the method names have not been proguarded out or renamed.
+        Method listMethod = nameToNoArgMethod.get(getter);
         if (listMethod != null && listMethod.getReturnType().equals(List.class)) {
           printField(
               buffer,
@@ -104,6 +108,30 @@ final class MessageLiteToString {
           continue;
         }
       }
+      if (suffix.endsWith(MAP_SUFFIX)
+          // Sometimes people have fields named 'map' that aren't maps.
+          && !suffix.equals(MAP_SUFFIX)) {
+        String camelCase =
+            suffix.substring(0, 1).toLowerCase()
+                + suffix.substring(1, suffix.length() - MAP_SUFFIX.length());
+        // Try to reflectively get the value and toString() the field as if it were a map. This only
+        // works if the method names have not been proguarded out or renamed.
+        Method mapMethod = nameToNoArgMethod.get(getter);
+        if (mapMethod != null
+            && mapMethod.getReturnType().equals(Map.class)
+            // Skip the deprecated getter method with no prefix "Map" when the field name ends with
+            // "map".
+            && !mapMethod.isAnnotationPresent(Deprecated.class)
+            // Skip the internal mutable getter method.
+            && Modifier.isPublic(mapMethod.getModifiers())) {
+          printField(
+              buffer,
+              indent,
+              camelCaseToSnakeCase(camelCase),
+              GeneratedMessageLite.invokeOrDie(mapMethod, messageLite));
+          continue;
+        }
+      }
 
       Method setter = nameToMethod.get("set" + suffix);
       if (setter == null) {
@@ -119,22 +147,19 @@ final class MessageLiteToString {
       String camelCase = suffix.substring(0, 1).toLowerCase() + suffix.substring(1);
 
       // Try to reflectively get the value and toString() the field as if it were optional. This
-      // only works if the method names have not be proguarded out or renamed.
+      // only works if the method names have not been proguarded out or renamed.
       Method getMethod = nameToNoArgMethod.get("get" + suffix);
       Method hasMethod = nameToNoArgMethod.get("has" + suffix);
       // TODO(dweis): Fix proto3 semantics.
       if (getMethod != null) {
         Object value = GeneratedMessageLite.invokeOrDie(getMethod, messageLite);
-        final boolean hasValue = hasMethod == null
-            ? !isDefaultValue(value)
-            : (Boolean) GeneratedMessageLite.invokeOrDie(hasMethod, messageLite);
-         // TODO(dweis): This doesn't stop printing oneof case twice: value and enum style.
+        final boolean hasValue =
+            hasMethod == null
+                ? !isDefaultValue(value)
+                : (Boolean) GeneratedMessageLite.invokeOrDie(hasMethod, messageLite);
+        // TODO(dweis): This doesn't stop printing oneof case twice: value and enum style.
         if (hasValue) {
-          printField(
-              buffer,
-              indent,
-              camelCaseToSnakeCase(camelCase),
-              value);
+          printField(buffer, indent, camelCaseToSnakeCase(camelCase), value);
         }
         continue;
       }
@@ -153,7 +178,7 @@ final class MessageLiteToString {
       ((GeneratedMessageLite<?, ?>) messageLite).unknownFields.printWithIndent(buffer, indent);
     }
   }
-  
+
   private static boolean isDefaultValue(Object o) {
     if (o instanceof Boolean) {
       return !((Boolean) o);
@@ -179,7 +204,7 @@ final class MessageLiteToString {
     if (o instanceof java.lang.Enum<?>) { // Catches oneof enums.
       return ((java.lang.Enum<?>) o).ordinal() == 0;
     }
-    
+
     return false;
   }
 
@@ -201,6 +226,13 @@ final class MessageLiteToString {
       }
       return;
     }
+    if (object instanceof Map<?, ?>) {
+      Map<?, ?> map = (Map<?, ?>) object;
+      for (Map.Entry<?, ?> entry : map.entrySet()) {
+        printField(buffer, indent, name, entry);
+      }
+      return;
+    }
 
     buffer.append('\n');
     for (int i = 0; i < indent; i++) {
@@ -220,11 +252,21 @@ final class MessageLiteToString {
         buffer.append(' ');
       }
       buffer.append("}");
+    } else if (object instanceof Map.Entry<?, ?>) {
+      buffer.append(" {");
+      Map.Entry<?, ?> entry = (Map.Entry<?, ?>) object;
+      printField(buffer, indent + 2, "key", entry.getKey());
+      printField(buffer, indent + 2, "value", entry.getValue());
+      buffer.append("\n");
+      for (int i = 0; i < indent; i++) {
+        buffer.append(' ');
+      }
+      buffer.append("}");
     } else {
       buffer.append(": ").append(object.toString());
     }
   }
-  
+
   private static final String camelCaseToSnakeCase(String camelCase) {
     StringBuilder builder = new StringBuilder();
     for (int i = 0; i < camelCase.length(); i++) {
diff --git a/java/core/src/main/java/com/google/protobuf/MessageReflection.java b/java/core/src/main/java/com/google/protobuf/MessageReflection.java
index 3d73efb3..69ad7ddf 100644
--- a/java/core/src/main/java/com/google/protobuf/MessageReflection.java
+++ b/java/core/src/main/java/com/google/protobuf/MessageReflection.java
@@ -31,7 +31,6 @@
 package com.google.protobuf;
 
 import com.google.protobuf.Descriptors.FieldDescriptor;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
@@ -714,12 +713,14 @@ class MessageReflection {
   }
 
   /**
-   * Parses a single field into MergeTarget. The target can be Message.Builder,
-   * FieldSet or MutableMessage.
+   * Parses a single field into MergeTarget. The target can be Message.Builder, FieldSet or
+   * MutableMessage.
    *
-   * Package-private because it is used by GeneratedMessage.ExtendableMessage.
+   * <p>Package-private because it is used by GeneratedMessage.ExtendableMessage.
    *
    * @param tag The tag, which should have already been read.
+   * @param unknownFields If not null, unknown fields will be merged to this {@link
+   *     UnknownFieldSet}, otherwise unknown fields will be discarded.
    * @return {@code true} unless the tag is an end-group tag.
    */
   static boolean mergeFieldFrom(
@@ -728,7 +729,8 @@ class MessageReflection {
       ExtensionRegistryLite extensionRegistry,
       Descriptors.Descriptor type,
       MergeTarget target,
-      int tag) throws IOException {
+      int tag)
+      throws IOException {
     if (type.getOptions().getMessageSetWireFormat() &&
         tag == WireFormat.MESSAGE_SET_ITEM_TAG) {
       mergeMessageSetExtensionFromCodedStream(
@@ -792,7 +794,11 @@ class MessageReflection {
     }
 
     if (unknown) {  // Unknown field or wrong wire type.  Skip.
-      return unknownFields.mergeFieldFrom(tag, input);
+      if (unknownFields != null) {
+        return unknownFields.mergeFieldFrom(tag, input);
+      } else {
+        return input.skipField(tag);
+      }
     }
 
     if (packed) {
@@ -844,7 +850,9 @@ class MessageReflection {
             // If the number isn't recognized as a valid value for this enum,
             // drop it.
             if (value == null) {
-              unknownFields.mergeVarintField(fieldNumber, rawValue);
+              if (unknownFields != null) {
+                unknownFields.mergeVarintField(fieldNumber, rawValue);
+              }
               return true;
             }
           }
@@ -947,7 +955,7 @@ class MessageReflection {
         mergeMessageSetExtensionFromBytes(
             rawBytes, extension, extensionRegistry, target);
       } else { // We don't know how to parse this. Ignore it.
-        if (rawBytes != null) {
+        if (rawBytes != null && unknownFields != null) {
           unknownFields.mergeField(typeId, UnknownFieldSet.Field.newBuilder()
               .addLengthDelimited(rawBytes).build());
         }
diff --git a/java/core/src/main/java/com/google/protobuf/Parser.java b/java/core/src/main/java/com/google/protobuf/Parser.java
index cfbcb442..e07c6895 100644
--- a/java/core/src/main/java/com/google/protobuf/Parser.java
+++ b/java/core/src/main/java/com/google/protobuf/Parser.java
@@ -31,6 +31,7 @@
 package com.google.protobuf;
 
 import java.io.InputStream;
+import java.nio.ByteBuffer;
 
 /**
  * Abstract interface for parsing Protocol Messages.
@@ -93,6 +94,18 @@ public interface Parser<MessageType> {
   // Convenience methods.
 
   /**
+   * Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
+   * {@link #parseFrom(CodedInputStream)}.
+   */
+  public MessageType parseFrom(ByteBuffer data) throws InvalidProtocolBufferException;
+
+  /**
+   * Parses {@code data} as a message of {@code MessageType}. This is just a small wrapper around
+   * {@link #parseFrom(CodedInputStream, ExtensionRegistryLite)}.
+   */
+  public MessageType parseFrom(ByteBuffer data, ExtensionRegistryLite extensionRegistry)
+      throws InvalidProtocolBufferException;
+  /**
    * Parses {@code data} as a message of {@code MessageType}.
    * This is just a small wrapper around {@link #parseFrom(CodedInputStream)}.
    */
diff --git a/java/core/src/main/java/com/google/protobuf/PrimitiveNonBoxingCollection.java b/java/core/src/main/java/com/google/protobuf/PrimitiveNonBoxingCollection.java
new file mode 100644
index 00000000..79b5769d
--- /dev/null
+++ b/java/core/src/main/java/com/google/protobuf/PrimitiveNonBoxingCollection.java
@@ -0,0 +1,34 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+/** A marker interface indicating that the collection supports primitives and is non-boxing. */
+interface PrimitiveNonBoxingCollection {}
diff --git a/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilderV3.java b/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilderV3.java
index 77b61b5f..30c991d4 100644
--- a/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilderV3.java
+++ b/java/core/src/main/java/com/google/protobuf/RepeatedFieldBuilderV3.java
@@ -30,6 +30,8 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 import java.util.AbstractList;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -290,9 +292,7 @@ public class RepeatedFieldBuilderV3
    */
   public RepeatedFieldBuilderV3<MType, BType, IType> setMessage(
       int index, MType message) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(message);
     ensureMutableMessageList();
     messages.set(index, message);
     if (builders != null) {
@@ -315,9 +315,7 @@ public class RepeatedFieldBuilderV3
    */
   public RepeatedFieldBuilderV3<MType, BType, IType> addMessage(
       MType message) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(message);
     ensureMutableMessageList();
     messages.add(message);
     if (builders != null) {
@@ -339,9 +337,7 @@ public class RepeatedFieldBuilderV3
    */
   public RepeatedFieldBuilderV3<MType, BType, IType> addMessage(
       int index, MType message) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
+    checkNotNull(message);
     ensureMutableMessageList();
     messages.add(index, message);
     if (builders != null) {
@@ -363,9 +359,7 @@ public class RepeatedFieldBuilderV3
   public RepeatedFieldBuilderV3<MType, BType, IType> addAllMessages(
       Iterable<? extends MType> values) {
     for (final MType value : values) {
-      if (value == null) {
-        throw new NullPointerException();
-      }
+      checkNotNull(value);
     }
 
     // If we can inspect the size, we can more efficiently add messages.
diff --git a/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java b/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
index fb1f76a7..8ab0f26d 100644
--- a/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
+++ b/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
@@ -30,6 +30,8 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.Internal.checkNotNull;
+
 /**
  * {@code SingleFieldBuilderV3} implements a structure that a protocol
  * message uses to hold a single field of another protocol message. It supports
@@ -84,10 +86,7 @@ public class SingleFieldBuilderV3
       MType message,
       AbstractMessage.BuilderParent parent,
       boolean isClean) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
-    this.message = message;
+    this.message = checkNotNull(message);
     this.parent = parent;
     this.isClean = isClean;
   }
@@ -169,10 +168,7 @@ public class SingleFieldBuilderV3
    */
   public SingleFieldBuilderV3<MType, BType, IType> setMessage(
       MType message) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
-    this.message = message;
+    this.message = checkNotNull(message);
     if (builder != null) {
       builder.dispose();
       builder = null;
diff --git a/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java b/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java
index 66033f58..279edc4d 100644
--- a/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java
+++ b/java/core/src/main/java/com/google/protobuf/SmallSortedMap.java
@@ -540,8 +540,8 @@ class SmallSortedMap<K extends Comparable<K>, V> extends AbstractMap<K, V> {
 
     @Override
     public boolean hasNext() {
-      return (pos + 1) < entryList.size() ||
-          getOverflowIterator().hasNext();
+      return (pos + 1) < entryList.size()
+          || (!overflowEntries.isEmpty() && getOverflowIterator().hasNext());
     }
 
     @Override
diff --git a/java/core/src/main/java/com/google/protobuf/TextFormat.java b/java/core/src/main/java/com/google/protobuf/TextFormat.java
index 49708242..25c3474f 100644
--- a/java/core/src/main/java/com/google/protobuf/TextFormat.java
+++ b/java/core/src/main/java/com/google/protobuf/TextFormat.java
@@ -34,7 +34,6 @@ import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.EnumDescriptor;
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
-
 import java.io.IOException;
 import java.math.BigInteger;
 import java.nio.CharBuffer;
@@ -56,14 +55,7 @@ import java.util.regex.Pattern;
 public final class TextFormat {
   private TextFormat() {}
 
-  private static final Logger logger =
-      Logger.getLogger(TextFormat.class.getName());
-
-  private static final Printer DEFAULT_PRINTER = new Printer();
-  private static final Printer SINGLE_LINE_PRINTER =
-      (new Printer()).setSingleLineMode(true);
-  private static final Printer UNICODE_PRINTER =
-      (new Printer()).setEscapeNonAscii(false);
+  private static final Logger logger = Logger.getLogger(TextFormat.class.getName());
 
   /**
    * Outputs a textual representation of the Protocol Message supplied into
@@ -73,14 +65,14 @@ public final class TextFormat {
   public static void print(
       final MessageOrBuilder message, final Appendable output)
       throws IOException {
-    DEFAULT_PRINTER.print(message, new TextGenerator(output));
+    Printer.DEFAULT.print(message, multiLineOutput(output));
   }
 
   /** Outputs a textual representation of {@code fields} to {@code output}. */
   public static void print(final UnknownFieldSet fields,
                            final Appendable output)
                            throws IOException {
-    DEFAULT_PRINTER.printUnknownFields(fields, new TextGenerator(output));
+    Printer.DEFAULT.printUnknownFields(fields, multiLineOutput(output));
   }
 
   /**
@@ -90,7 +82,7 @@ public final class TextFormat {
   public static void printUnicode(
       final MessageOrBuilder message, final Appendable output)
       throws IOException {
-    UNICODE_PRINTER.print(message, new TextGenerator(output));
+    Printer.UNICODE.print(message, multiLineOutput(output));
   }
 
   /**
@@ -100,7 +92,7 @@ public final class TextFormat {
   public static void printUnicode(final UnknownFieldSet fields,
                                   final Appendable output)
                                   throws IOException {
-    UNICODE_PRINTER.printUnknownFields(fields, new TextGenerator(output));
+    Printer.UNICODE.printUnknownFields(fields, multiLineOutput(output));
   }
 
   /**
@@ -109,10 +101,9 @@ public final class TextFormat {
    */
   public static String shortDebugString(final MessageOrBuilder message) {
     try {
-      final StringBuilder sb = new StringBuilder();
-      SINGLE_LINE_PRINTER.print(message, new TextGenerator(sb));
-      // Single line mode currently might have an extra space at the end.
-      return sb.toString().trim();
+      final StringBuilder text = new StringBuilder();
+      Printer.DEFAULT.print(message, singleLineOutput(text));
+      return text.toString();
     } catch (IOException e) {
       throw new IllegalStateException(e);
     }
@@ -125,11 +116,11 @@ public final class TextFormat {
   public static String shortDebugString(final FieldDescriptor field,
                                         final Object value) {
     try {
-      final StringBuilder sb = new StringBuilder();
-      SINGLE_LINE_PRINTER.printField(field, value, new TextGenerator(sb));
-      return sb.toString().trim();
+      final StringBuilder text = new StringBuilder();
+      Printer.DEFAULT.printField(field, value, singleLineOutput(text));
+      return text.toString();
     } catch (IOException e) {
-        throw new IllegalStateException(e);
+      throw new IllegalStateException(e);
     }
   }
 
@@ -139,10 +130,9 @@ public final class TextFormat {
    */
   public static String shortDebugString(final UnknownFieldSet fields) {
     try {
-      final StringBuilder sb = new StringBuilder();
-      SINGLE_LINE_PRINTER.printUnknownFields(fields, new TextGenerator(sb));
-      // Single line mode currently might have an extra space at the end.
-      return sb.toString().trim();
+      final StringBuilder text = new StringBuilder();
+      Printer.DEFAULT.printUnknownFields(fields, singleLineOutput(text));
+      return text.toString();
     } catch (IOException e) {
       throw new IllegalStateException(e);
     }
@@ -183,7 +173,7 @@ public final class TextFormat {
   public static String printToUnicodeString(final MessageOrBuilder message) {
     try {
       final StringBuilder text = new StringBuilder();
-      UNICODE_PRINTER.print(message, new TextGenerator(text));
+      Printer.UNICODE.print(message, multiLineOutput(text));
       return text.toString();
     } catch (IOException e) {
       throw new IllegalStateException(e);
@@ -197,7 +187,7 @@ public final class TextFormat {
   public static String printToUnicodeString(final UnknownFieldSet fields) {
     try {
       final StringBuilder text = new StringBuilder();
-      UNICODE_PRINTER.printUnknownFields(fields, new TextGenerator(text));
+      Printer.UNICODE.printUnknownFields(fields, multiLineOutput(text));
       return text.toString();
     } catch (IOException e) {
       throw new IllegalStateException(e);
@@ -208,7 +198,7 @@ public final class TextFormat {
                                 final Object value,
                                 final Appendable output)
                                 throws IOException {
-    DEFAULT_PRINTER.printField(field, value, new TextGenerator(output));
+    Printer.DEFAULT.printField(field, value, multiLineOutput(output));
   }
 
   public static String printFieldToString(final FieldDescriptor field,
@@ -223,6 +213,23 @@ public final class TextFormat {
   }
 
   /**
+   * Outputs a unicode textual representation of the value of given field value.
+   *
+   * <p>Same as {@code printFieldValue()}, except that non-ASCII characters in string type fields
+   * are not escaped in backslash+octals.
+   *
+   * @param field the descriptor of the field
+   * @param value the value of the field
+   * @param output the output to which to append the formatted value
+   * @throws ClassCastException if the value is not appropriate for the given field descriptor
+   * @throws IOException if there is an exception writing to the output
+   */
+  public static void printUnicodeFieldValue(
+      final FieldDescriptor field, final Object value, final Appendable output) throws IOException {
+    Printer.UNICODE.printFieldValue(field, value, multiLineOutput(output));
+  }
+
+  /**
    * Outputs a textual representation of the value of given field value.
    *
    * @param field the descriptor of the field
@@ -236,7 +243,7 @@ public final class TextFormat {
                                      final Object value,
                                      final Appendable output)
                                      throws IOException {
-    DEFAULT_PRINTER.printFieldValue(field, value, new TextGenerator(output));
+    Printer.DEFAULT.printFieldValue(field, value, multiLineOutput(output));
   }
 
   /**
@@ -253,7 +260,7 @@ public final class TextFormat {
                                             final Object value,
                                             final Appendable output)
                                             throws IOException {
-    printUnknownFieldValue(tag, value, new TextGenerator(output));
+    printUnknownFieldValue(tag, value, multiLineOutput(output));
   }
 
   private static void printUnknownFieldValue(final int tag,
@@ -272,12 +279,24 @@ public final class TextFormat {
         generator.print(String.format((Locale) null, "0x%016x", (Long) value));
         break;
       case WireFormat.WIRETYPE_LENGTH_DELIMITED:
-        generator.print("\"");
-        generator.print(escapeBytes((ByteString) value));
-        generator.print("\"");
+        try {
+          // Try to parse and print the field as an embedded message
+          UnknownFieldSet message = UnknownFieldSet.parseFrom((ByteString) value);
+          generator.print("{");
+          generator.eol();
+          generator.indent();
+          Printer.DEFAULT.printUnknownFields(message, generator);
+          generator.outdent();
+          generator.print("}");
+        } catch (InvalidProtocolBufferException e) {
+          // If not parseable as a message, print as a String
+          generator.print("\"");
+          generator.print(escapeBytes((ByteString) value));
+          generator.print("\"");
+        }
         break;
       case WireFormat.WIRETYPE_START_GROUP:
-        DEFAULT_PRINTER.printUnknownFields((UnknownFieldSet) value, generator);
+        Printer.DEFAULT.printUnknownFields((UnknownFieldSet) value, generator);
         break;
       default:
         throw new IllegalArgumentException("Bad tag: " + tag);
@@ -286,24 +305,16 @@ public final class TextFormat {
 
   /** Helper class for converting protobufs to text. */
   private static final class Printer {
-    /** Whether to omit newlines from the output. */
-    boolean singleLineMode = false;
+    // Printer instance which escapes non-ASCII characters.
+    static final Printer DEFAULT = new Printer(true);
+    // Printer instance which emits Unicode (it still escapes newlines and quotes in strings).
+    static final Printer UNICODE = new Printer(false);
 
     /** Whether to escape non ASCII characters with backslash and octal. */
-    boolean escapeNonAscii = true;
-
-    private Printer() {}
-
-    /** Setter of singleLineMode */
-    private Printer setSingleLineMode(boolean singleLineMode) {
-      this.singleLineMode = singleLineMode;
-      return this;
-    }
+    private final boolean escapeNonAscii;
 
-    /** Setter of escapeNonAscii */
-    private Printer setEscapeNonAscii(boolean escapeNonAscii) {
+    private Printer(boolean escapeNonAscii) {
       this.escapeNonAscii = escapeNonAscii;
-      return this;
     }
 
     private void print(
@@ -355,12 +366,9 @@ public final class TextFormat {
       }
 
       if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
-        if (singleLineMode) {
-          generator.print(" { ");
-        } else {
-          generator.print(" {\n");
-          generator.indent();
-        }
+        generator.print(" {");
+        generator.eol();
+        generator.indent();
       } else {
         generator.print(": ");
       }
@@ -368,19 +376,10 @@ public final class TextFormat {
       printFieldValue(field, value, generator);
 
       if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
-        if (singleLineMode) {
-          generator.print("} ");
-        } else {
-          generator.outdent();
-          generator.print("}\n");
-        }
-      } else {
-        if (singleLineMode) {
-          generator.print(" ");
-        } else {
-          generator.print("\n");
-        }
+        generator.outdent();
+        generator.print("}");
       }
+      generator.eol();
     }
 
     private void printFieldValue(final FieldDescriptor field,
@@ -469,19 +468,13 @@ public final class TextFormat {
             field.getLengthDelimitedList(), generator);
         for (final UnknownFieldSet value : field.getGroupList()) {
           generator.print(entry.getKey().toString());
-          if (singleLineMode) {
-            generator.print(" { ");
-          } else {
-            generator.print(" {\n");
-            generator.indent();
-          }
+          generator.print(" {");
+          generator.eol();
+          generator.indent();
           printUnknownFields(value, generator);
-          if (singleLineMode) {
-            generator.print("} ");
-          } else {
-            generator.outdent();
-            generator.print("}\n");
-          }
+          generator.outdent();
+          generator.print("}");
+          generator.eol();
         }
       }
     }
@@ -495,7 +488,7 @@ public final class TextFormat {
         generator.print(String.valueOf(number));
         generator.print(": ");
         printUnknownFieldValue(wireType, value, generator);
-        generator.print(singleLineMode ? " " : "\n");
+        generator.eol();
       }
     }
   }
@@ -521,16 +514,29 @@ public final class TextFormat {
     }
   }
 
-  /**
+  private static TextGenerator multiLineOutput(Appendable output) {
+    return new TextGenerator(output, false);
+  }
+
+  private static TextGenerator singleLineOutput(Appendable output) {
+    return new TextGenerator(output, true);
+  }
+
+ /**
    * An inner class for writing text to the output stream.
    */
   private static final class TextGenerator {
     private final Appendable output;
     private final StringBuilder indent = new StringBuilder();
-    private boolean atStartOfLine = true;
+    private final boolean singleLineMode;
+    // While technically we are "at the start of a line" at the very beginning of the output, all
+    // we would do in response to this is emit the (zero length) indentation, so it has no effect.
+    // Setting it false here does however suppress an unwanted leading space in single-line mode.
+    private boolean atStartOfLine = false;
 
-    private TextGenerator(final Appendable output) {
+    private TextGenerator(final Appendable output, boolean singleLineMode) {
       this.output = output;
+      this.singleLineMode = singleLineMode;
     }
 
     /**
@@ -552,35 +558,31 @@ public final class TextFormat {
         throw new IllegalArgumentException(
             " Outdent() without matching Indent().");
       }
-      indent.delete(length - 2, length);
+      indent.setLength(length - 2);
     }
 
     /**
-     * Print text to the output stream.
+     * Print text to the output stream. Bare newlines are never expected to be passed to this
+     * method; to indicate the end of a line, call "eol()".
      */
     public void print(final CharSequence text) throws IOException {
-      final int size = text.length();
-      int pos = 0;
-
-      for (int i = 0; i < size; i++) {
-        if (text.charAt(i) == '\n') {
-          write(text.subSequence(pos, i + 1));
-          pos = i + 1;
-          atStartOfLine = true;
-        }
+      if (atStartOfLine) {
+        atStartOfLine = false;
+        output.append(singleLineMode ? " " : indent);
       }
-      write(text.subSequence(pos, size));
+      output.append(text);
     }
 
-    private void write(final CharSequence data) throws IOException {
-      if (data.length() == 0) {
-        return;
-      }
-      if (atStartOfLine) {
-        atStartOfLine = false;
-        output.append(indent);
+    /**
+     * Signifies reaching the "end of the current line" in the output. In single-line mode, this
+     * does not result in a newline being emitted, but ensures that a separating space is written
+     * before the next output.
+     */
+    public void eol() throws IOException {
+      if (!singleLineMode) {
+        output.append("\n");
       }
-      output.append(data);
+      atStartOfLine = true;
     }
   }
 
@@ -985,7 +987,7 @@ public final class TextFormat {
         nextToken();
         return false;
       } else {
-        throw parseException("Expected \"true\" or \"false\".");
+        throw parseException("Expected \"true\" or \"false\". Found \"" + currentToken + "\".");
       }
     }
 
@@ -1222,6 +1224,22 @@ public final class TextFormat {
   }
 
   /**
+   * Parse a text-format message from {@code input}.
+   *
+   * @return the parsed message, guaranteed initialized
+   */
+  public static <T extends Message> T parse(final CharSequence input,
+                                            final Class<T> protoClass)
+                                            throws ParseException {
+    Message.Builder builder =
+        Internal.getDefaultInstance(protoClass).newBuilderForType();
+    merge(input, builder);
+    @SuppressWarnings("unchecked")
+    T output = (T) builder.build();
+    return output;
+  }
+
+  /**
    * Parse a text-format message from {@code input} and merge the contents
    * into {@code builder}.  Extensions will be recognized if they are
    * registered in {@code extensionRegistry}.
@@ -1246,6 +1264,25 @@ public final class TextFormat {
     PARSER.merge(input, extensionRegistry, builder);
   }
 
+  /**
+   * Parse a text-format message from {@code input}.  Extensions will be
+   * recognized if they are registered in {@code extensionRegistry}.
+   *
+   * @return the parsed message, guaranteed initialized
+   */
+  public static <T extends Message> T parse(
+      final CharSequence input,
+      final ExtensionRegistry extensionRegistry,
+      final Class<T> protoClass)
+      throws ParseException {
+    Message.Builder builder =
+        Internal.getDefaultInstance(protoClass).newBuilderForType();
+    merge(input, extensionRegistry, builder);
+    @SuppressWarnings("unchecked")
+    T output = (T) builder.build();
+    return output;
+  }
+
 
   /**
    * Parser for text-format proto2 instances. This class is thread-safe.
@@ -1274,13 +1311,17 @@ public final class TextFormat {
     }
 
     private final boolean allowUnknownFields;
+    private final boolean allowUnknownEnumValues;
     private final SingularOverwritePolicy singularOverwritePolicy;
     private TextFormatParseInfoTree.Builder parseInfoTreeBuilder;
 
     private Parser(
-        boolean allowUnknownFields, SingularOverwritePolicy singularOverwritePolicy,
+        boolean allowUnknownFields,
+        boolean allowUnknownEnumValues,
+        SingularOverwritePolicy singularOverwritePolicy,
         TextFormatParseInfoTree.Builder parseInfoTreeBuilder) {
       this.allowUnknownFields = allowUnknownFields;
+      this.allowUnknownEnumValues = allowUnknownEnumValues;
       this.singularOverwritePolicy = singularOverwritePolicy;
       this.parseInfoTreeBuilder = parseInfoTreeBuilder;
     }
@@ -1297,6 +1338,7 @@ public final class TextFormat {
      */
     public static class Builder {
       private boolean allowUnknownFields = false;
+      private boolean allowUnknownEnumValues = false;
       private SingularOverwritePolicy singularOverwritePolicy =
           SingularOverwritePolicy.ALLOW_SINGULAR_OVERWRITES;
       private TextFormatParseInfoTree.Builder parseInfoTreeBuilder = null;
@@ -1318,7 +1360,10 @@ public final class TextFormat {
 
       public Parser build() {
         return new Parser(
-            allowUnknownFields, singularOverwritePolicy, parseInfoTreeBuilder);
+            allowUnknownFields,
+            allowUnknownEnumValues,
+            singularOverwritePolicy,
+            parseInfoTreeBuilder);
       }
     }
 
@@ -1382,7 +1427,7 @@ public final class TextFormat {
       return text;
     }
 
-    // Check both unknown fields and unknown extensions and log warming messages
+    // Check both unknown fields and unknown extensions and log warning messages
     // or throw exceptions according to the flag.
     private void checkUnknownFields(final List<String> unknownFields)
         throws ParseException {
@@ -1442,7 +1487,7 @@ public final class TextFormat {
 
     /**
      * Parse a single field from {@code tokenizer} and merge it into
-     * {@code builder}.
+     * {@code target}.
      */
     private void mergeField(final Tokenizer tokenizer,
                             final ExtensionRegistry extensionRegistry,
@@ -1469,9 +1514,15 @@ public final class TextFormat {
             extensionRegistry, name.toString());
 
         if (extension == null) {
-          unknownFields.add((tokenizer.getPreviousLine() + 1) + ":" +
-              (tokenizer.getPreviousColumn() + 1) + ":\t" +
-              type.getFullName() + ".[" + name + "]");
+          unknownFields.add(
+              (tokenizer.getPreviousLine() + 1)
+                  + ":"
+                  + (tokenizer.getPreviousColumn() + 1)
+                  + ":\t"
+                  + type.getFullName()
+                  + ".["
+                  + name
+                  + "]");
         } else {
           if (extension.descriptor.getContainingType() != type) {
             throw tokenizer.parseExceptionPreviousToken(
@@ -1506,9 +1557,14 @@ public final class TextFormat {
         }
 
         if (field == null) {
-          unknownFields.add((tokenizer.getPreviousLine() + 1) + ":" +
-              (tokenizer.getPreviousColumn() + 1) + ":\t" +
-              type.getFullName() + "." + name);
+          unknownFields.add(
+              (tokenizer.getPreviousLine() + 1)
+                  + ":"
+                  + (tokenizer.getPreviousColumn() + 1)
+                  + ":\t"
+                  + type.getFullName()
+                  + "."
+                  + name);
         }
       }
 
@@ -1689,17 +1745,40 @@ public final class TextFormat {
               final int number = tokenizer.consumeInt32();
               value = enumType.findValueByNumber(number);
               if (value == null) {
-                throw tokenizer.parseExceptionPreviousToken(
-                  "Enum type \"" + enumType.getFullName()
-                  + "\" has no value with number " + number + '.');
+                String unknownValueMsg =
+                    "Enum type \""
+                        + enumType.getFullName()
+                        + "\" has no value with number "
+                        + number
+                        + '.';
+                if (allowUnknownEnumValues) {
+                  logger.warning(unknownValueMsg);
+                  return;
+                } else {
+                  throw tokenizer.parseExceptionPreviousToken(
+                      "Enum type \""
+                          + enumType.getFullName()
+                          + "\" has no value with number "
+                          + number
+                          + '.');
+                }
               }
             } else {
               final String id = tokenizer.consumeIdentifier();
               value = enumType.findValueByName(id);
               if (value == null) {
-                throw tokenizer.parseExceptionPreviousToken(
-                  "Enum type \"" + enumType.getFullName()
-                  + "\" has no value named \"" + id + "\".");
+                String unknownValueMsg =
+                    "Enum type \""
+                        + enumType.getFullName()
+                        + "\" has no value named \""
+                        + id
+                        + "\".";
+                if (allowUnknownEnumValues) {
+                  logger.warning(unknownValueMsg);
+                  return;
+                } else {
+                  throw tokenizer.parseExceptionPreviousToken(unknownValueMsg);
+                }
               }
             }
 
@@ -1712,6 +1791,8 @@ public final class TextFormat {
       }
 
       if (field.isRepeated()) {
+        // TODO(b/29122459): If field.isMapField() and FORBID_SINGULAR_OVERWRITES mode,
+        //     check for duplicate map keys here.
         target.addRepeatedField(field, value);
       } else if ((singularOverwritePolicy
               == SingularOverwritePolicy.FORBID_SINGULAR_OVERWRITES)
diff --git a/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java b/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java
index 2bef27e9..37d64633 100644
--- a/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java
+++ b/java/core/src/main/java/com/google/protobuf/UnknownFieldSet.java
@@ -91,7 +91,7 @@ public final class UnknownFieldSet implements MessageLite {
    * Construct an {@code UnknownFieldSet} around the given map.  The map is
    * expected to be immutable.
    */
-  private UnknownFieldSet(final Map<Integer, Field> fields,
+  UnknownFieldSet(final Map<Integer, Field> fields,
       final Map<Integer, Field> fieldsDescending) {
     this.fields = fields;
   }
diff --git a/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java b/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
index d6226fc7..f0b919ad 100644
--- a/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
+++ b/java/core/src/main/java/com/google/protobuf/UnknownFieldSetLite.java
@@ -81,7 +81,7 @@ public final class UnknownFieldSetLite {
     System.arraycopy(second.objects, 0, objects, first.count, second.count);
     return new UnknownFieldSetLite(count, tags, objects, true /* isMutable */);
   }
-  
+
   /**
    * The number of elements in the set.
    */
@@ -295,14 +295,30 @@ public final class UnknownFieldSetLite {
     return true;
   }
 
+  private static int hashCode(int[] tags, int count) {
+    int hashCode = 17;
+    for (int i = 0; i < count; ++i) {
+      hashCode = 31 * hashCode + tags[i];
+    }
+    return hashCode;
+  }
+
+  private static int hashCode(Object[] objects, int count) {
+    int hashCode = 17;
+    for (int i = 0; i < count; ++i) {
+      hashCode = 31 * hashCode + objects[i].hashCode();
+    }
+    return hashCode;
+  }
+
   @Override
   public int hashCode() {
     int hashCode = 17;
-    
+
     hashCode = 31 * hashCode + count;
-    hashCode = 31 * hashCode + Arrays.hashCode(tags);
-    hashCode = 31 * hashCode + Arrays.deepHashCode(objects);
-    
+    hashCode = 31 * hashCode + hashCode(tags, count);
+    hashCode = 31 * hashCode + hashCode(objects, count);
+
     return hashCode;
   }
 
@@ -323,6 +339,7 @@ public final class UnknownFieldSetLite {
 
   // Package private for unsafe experimental runtime.
   void storeField(int tag, Object value) {
+    checkMutable();
     ensureCapacity();
     
     tags[count] = tag;
diff --git a/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java b/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java
index 5f7bafd6..d84ef3c5 100644
--- a/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java
+++ b/java/core/src/main/java/com/google/protobuf/UnsafeUtil.java
@@ -35,17 +35,41 @@ import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.security.AccessController;
 import java.security.PrivilegedExceptionAction;
-import sun.misc.Unsafe;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /** Utility class for working with unsafe operations. */
-// TODO(nathanmittler): Add support for Android Memory/MemoryBlock
 final class UnsafeUtil {
+  private static final Logger logger = Logger.getLogger(UnsafeUtil.class.getName());
   private static final sun.misc.Unsafe UNSAFE = getUnsafe();
+  private static final MemoryAccessor MEMORY_ACCESSOR = getMemoryAccessor();
   private static final boolean HAS_UNSAFE_BYTEBUFFER_OPERATIONS =
       supportsUnsafeByteBufferOperations();
   private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS = supportsUnsafeArrayOperations();
-  private static final long ARRAY_BASE_OFFSET = byteArrayBaseOffset();
-  private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(field(Buffer.class, "address"));
+
+  private static final long BYTE_ARRAY_BASE_OFFSET = arrayBaseOffset(byte[].class);
+  // Micro-optimization: we can assume a scale of 1 and skip the multiply
+  // private static final long BYTE_ARRAY_INDEX_SCALE = 1;
+
+  private static final long BOOLEAN_ARRAY_BASE_OFFSET = arrayBaseOffset(boolean[].class);
+  private static final long BOOLEAN_ARRAY_INDEX_SCALE = arrayIndexScale(boolean[].class);
+
+  private static final long INT_ARRAY_BASE_OFFSET = arrayBaseOffset(int[].class);
+  private static final long INT_ARRAY_INDEX_SCALE = arrayIndexScale(int[].class);
+
+  private static final long LONG_ARRAY_BASE_OFFSET = arrayBaseOffset(long[].class);
+  private static final long LONG_ARRAY_INDEX_SCALE = arrayIndexScale(long[].class);
+
+  private static final long FLOAT_ARRAY_BASE_OFFSET = arrayBaseOffset(float[].class);
+  private static final long FLOAT_ARRAY_INDEX_SCALE = arrayIndexScale(float[].class);
+
+  private static final long DOUBLE_ARRAY_BASE_OFFSET = arrayBaseOffset(double[].class);
+  private static final long DOUBLE_ARRAY_INDEX_SCALE = arrayIndexScale(double[].class);
+
+  private static final long OBJECT_ARRAY_BASE_OFFSET = arrayBaseOffset(Object[].class);
+  private static final long OBJECT_ARRAY_INDEX_SCALE = arrayIndexScale(Object[].class);
+
+  private static final long BUFFER_ADDRESS_OFFSET = fieldOffset(bufferAddressField());
 
   private UnsafeUtil() {}
 
@@ -57,131 +81,193 @@ final class UnsafeUtil {
     return HAS_UNSAFE_BYTEBUFFER_OPERATIONS;
   }
 
-  static Object allocateInstance(Class<?> clazz) {
-    try {
-      return UNSAFE.allocateInstance(clazz);
-    } catch (InstantiationException e) {
-      throw new RuntimeException(e);
-    }
-  }
 
   static long objectFieldOffset(Field field) {
-    return UNSAFE.objectFieldOffset(field);
+    return MEMORY_ACCESSOR.objectFieldOffset(field);
   }
 
-  static long getArrayBaseOffset() {
-    return ARRAY_BASE_OFFSET;
+  private static int arrayBaseOffset(Class<?> clazz) {
+    return HAS_UNSAFE_ARRAY_OPERATIONS ? MEMORY_ACCESSOR.arrayBaseOffset(clazz) : -1;
+  }
+
+  private static int arrayIndexScale(Class<?> clazz) {
+    return HAS_UNSAFE_ARRAY_OPERATIONS ? MEMORY_ACCESSOR.arrayIndexScale(clazz) : -1;
   }
 
   static byte getByte(Object target, long offset) {
-    return UNSAFE.getByte(target, offset);
+    return MEMORY_ACCESSOR.getByte(target, offset);
   }
 
   static void putByte(Object target, long offset, byte value) {
-    UNSAFE.putByte(target, offset, value);
+    MEMORY_ACCESSOR.putByte(target, offset, value);
   }
 
   static int getInt(Object target, long offset) {
-    return UNSAFE.getInt(target, offset);
+    return MEMORY_ACCESSOR.getInt(target, offset);
   }
 
   static void putInt(Object target, long offset, int value) {
-    UNSAFE.putInt(target, offset, value);
+    MEMORY_ACCESSOR.putInt(target, offset, value);
   }
 
   static long getLong(Object target, long offset) {
-    return UNSAFE.getLong(target, offset);
+    return MEMORY_ACCESSOR.getLong(target, offset);
   }
 
   static void putLong(Object target, long offset, long value) {
-    UNSAFE.putLong(target, offset, value);
+    MEMORY_ACCESSOR.putLong(target, offset, value);
   }
 
   static boolean getBoolean(Object target, long offset) {
-    return UNSAFE.getBoolean(target, offset);
+    return MEMORY_ACCESSOR.getBoolean(target, offset);
   }
 
   static void putBoolean(Object target, long offset, boolean value) {
-    UNSAFE.putBoolean(target, offset, value);
+    MEMORY_ACCESSOR.putBoolean(target, offset, value);
   }
 
   static float getFloat(Object target, long offset) {
-    return UNSAFE.getFloat(target, offset);
+    return MEMORY_ACCESSOR.getFloat(target, offset);
   }
 
   static void putFloat(Object target, long offset, float value) {
-    UNSAFE.putFloat(target, offset, value);
+    MEMORY_ACCESSOR.putFloat(target, offset, value);
   }
 
   static double getDouble(Object target, long offset) {
-    return UNSAFE.getDouble(target, offset);
+    return MEMORY_ACCESSOR.getDouble(target, offset);
   }
 
   static void putDouble(Object target, long offset, double value) {
-    UNSAFE.putDouble(target, offset, value);
+    MEMORY_ACCESSOR.putDouble(target, offset, value);
   }
 
   static Object getObject(Object target, long offset) {
-    return UNSAFE.getObject(target, offset);
+    return MEMORY_ACCESSOR.getObject(target, offset);
+  }
+
+  static byte getByte(byte[] target, long index) {
+    return MEMORY_ACCESSOR.getByte(target, BYTE_ARRAY_BASE_OFFSET + index);
+  }
+
+  static void putByte(byte[] target, long index, byte value) {
+    MEMORY_ACCESSOR.putByte(target, BYTE_ARRAY_BASE_OFFSET + index, value);
+  }
+
+  static int getInt(int[] target, long index) {
+    return MEMORY_ACCESSOR.getInt(target, INT_ARRAY_BASE_OFFSET + (index * INT_ARRAY_INDEX_SCALE));
+  }
+
+  static void putInt(int[] target, long index, int value) {
+    MEMORY_ACCESSOR.putInt(target, INT_ARRAY_BASE_OFFSET + (index * INT_ARRAY_INDEX_SCALE), value);
+  }
+
+  static long getLong(long[] target, long index) {
+    return MEMORY_ACCESSOR.getLong(
+        target, LONG_ARRAY_BASE_OFFSET + (index * LONG_ARRAY_INDEX_SCALE));
+  }
+
+  static void putLong(long[] target, long index, long value) {
+    MEMORY_ACCESSOR.putLong(
+        target, LONG_ARRAY_BASE_OFFSET + (index * LONG_ARRAY_INDEX_SCALE), value);
+  }
+
+  static boolean getBoolean(boolean[] target, long index) {
+    return MEMORY_ACCESSOR.getBoolean(
+        target, BOOLEAN_ARRAY_BASE_OFFSET + (index * BOOLEAN_ARRAY_INDEX_SCALE));
   }
 
-  static void putObject(Object target, long offset, Object value) {
-    UNSAFE.putObject(target, offset, value);
+  static void putBoolean(boolean[] target, long index, boolean value) {
+    MEMORY_ACCESSOR.putBoolean(
+        target, BOOLEAN_ARRAY_BASE_OFFSET + (index * BOOLEAN_ARRAY_INDEX_SCALE), value);
   }
 
-  static void copyMemory(
-      Object src, long srcOffset, Object target, long targetOffset, long length) {
-    UNSAFE.copyMemory(src, srcOffset, target, targetOffset, length);
+  static float getFloat(float[] target, long index) {
+    return MEMORY_ACCESSOR.getFloat(
+        target, FLOAT_ARRAY_BASE_OFFSET + (index * FLOAT_ARRAY_INDEX_SCALE));
+  }
+
+  static void putFloat(float[] target, long index, float value) {
+    MEMORY_ACCESSOR.putFloat(
+        target, FLOAT_ARRAY_BASE_OFFSET + (index * FLOAT_ARRAY_INDEX_SCALE), value);
+  }
+
+  static double getDouble(double[] target, long index) {
+    return MEMORY_ACCESSOR.getDouble(
+        target, DOUBLE_ARRAY_BASE_OFFSET + (index * DOUBLE_ARRAY_INDEX_SCALE));
+  }
+
+  static void putDouble(double[] target, long index, double value) {
+    MEMORY_ACCESSOR.putDouble(
+        target, DOUBLE_ARRAY_BASE_OFFSET + (index * DOUBLE_ARRAY_INDEX_SCALE), value);
+  }
+
+  static Object getObject(Object[] target, long index) {
+    return MEMORY_ACCESSOR.getObject(
+        target, OBJECT_ARRAY_BASE_OFFSET + (index * OBJECT_ARRAY_INDEX_SCALE));
+  }
+
+  static void putObject(Object[] target, long index, Object value) {
+    MEMORY_ACCESSOR.putObject(
+        target, OBJECT_ARRAY_BASE_OFFSET + (index * OBJECT_ARRAY_INDEX_SCALE), value);
+  }
+
+  static void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
+    MEMORY_ACCESSOR.copyMemory(src, srcIndex, targetOffset, length);
+  }
+
+  static void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
+    MEMORY_ACCESSOR.copyMemory(srcOffset, target, targetIndex, length);
+  }
+
+  static void copyMemory(byte[] src, long srcIndex, byte[] target, long targetIndex, long length) {
+    System.arraycopy(src, (int) srcIndex, target, (int) targetIndex, (int) length); 
   }
 
   static byte getByte(long address) {
-    return UNSAFE.getByte(address);
+    return MEMORY_ACCESSOR.getByte(address);
   }
 
   static void putByte(long address, byte value) {
-    UNSAFE.putByte(address, value);
+    MEMORY_ACCESSOR.putByte(address, value);
   }
 
   static int getInt(long address) {
-    return UNSAFE.getInt(address);
+    return MEMORY_ACCESSOR.getInt(address);
   }
 
   static void putInt(long address, int value) {
-    UNSAFE.putInt(address, value);
+    MEMORY_ACCESSOR.putInt(address, value);
   }
 
   static long getLong(long address) {
-    return UNSAFE.getLong(address);
+    return MEMORY_ACCESSOR.getLong(address);
   }
 
   static void putLong(long address, long value) {
-    UNSAFE.putLong(address, value);
-  }
-
-  static void copyMemory(long srcAddress, long targetAddress, long length) {
-    UNSAFE.copyMemory(srcAddress, targetAddress, length);
-  }
-
-  static void setMemory(long address, long numBytes, byte value) {
-    UNSAFE.setMemory(address, numBytes, value);
+    MEMORY_ACCESSOR.putLong(address, value);
   }
 
   /**
    * Gets the offset of the {@code address} field of the given direct {@link ByteBuffer}.
    */
   static long addressOffset(ByteBuffer buffer) {
-    return UNSAFE.getLong(buffer, BUFFER_ADDRESS_OFFSET);
+    return MEMORY_ACCESSOR.getLong(buffer, BUFFER_ADDRESS_OFFSET);
+  }
+
+  static Object getStaticObject(Field field) {
+    return MEMORY_ACCESSOR.getStaticObject(field);
   }
 
   /**
    * Gets the {@code sun.misc.Unsafe} instance, or {@code null} if not available on this platform.
    */
-  private static sun.misc.Unsafe getUnsafe() {
+  static sun.misc.Unsafe getUnsafe() {
     sun.misc.Unsafe unsafe = null;
     try {
       unsafe =
           AccessController.doPrivileged(
-              new PrivilegedExceptionAction<Unsafe>() {
+              new PrivilegedExceptionAction<sun.misc.Unsafe>() {
                 @Override
                 public sun.misc.Unsafe run() throws Exception {
                   Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
@@ -204,69 +290,90 @@ final class UnsafeUtil {
     return unsafe;
   }
 
+  /** Get a {@link MemoryAccessor} appropriate for the platform, or null if not supported. */
+  private static MemoryAccessor getMemoryAccessor() {
+    if (UNSAFE == null) {
+      return null;
+    }
+    return new JvmMemoryAccessor(UNSAFE);
+  }
+
   /** Indicates whether or not unsafe array operations are supported on this platform. */
   private static boolean supportsUnsafeArrayOperations() {
-    boolean supported = false;
-    if (UNSAFE != null) {
-      try {
-        Class<?> clazz = UNSAFE.getClass();
-        clazz.getMethod("objectFieldOffset", Field.class);
-        clazz.getMethod("allocateInstance", Class.class);
-        clazz.getMethod("arrayBaseOffset", Class.class);
-        clazz.getMethod("getByte", Object.class, long.class);
-        clazz.getMethod("putByte", Object.class, long.class, byte.class);
-        clazz.getMethod("getBoolean", Object.class, long.class);
-        clazz.getMethod("putBoolean", Object.class, long.class, boolean.class);
-        clazz.getMethod("getInt", Object.class, long.class);
-        clazz.getMethod("putInt", Object.class, long.class, int.class);
-        clazz.getMethod("getLong", Object.class, long.class);
-        clazz.getMethod("putLong", Object.class, long.class, long.class);
-        clazz.getMethod("getFloat", Object.class, long.class);
-        clazz.getMethod("putFloat", Object.class, long.class, float.class);
-        clazz.getMethod("getDouble", Object.class, long.class);
-        clazz.getMethod("putDouble", Object.class, long.class, double.class);
-        clazz.getMethod("getObject", Object.class, long.class);
-        clazz.getMethod("putObject", Object.class, long.class, Object.class);
-        clazz.getMethod(
-            "copyMemory", Object.class, long.class, Object.class, long.class, long.class);
-        supported = true;
-      } catch (Throwable e) {
-        // Do nothing.
-      }
+    if (UNSAFE == null) {
+      return false;
     }
-    return supported;
+    try {
+      Class<?> clazz = UNSAFE.getClass();
+      clazz.getMethod("objectFieldOffset", Field.class);
+      clazz.getMethod("arrayBaseOffset", Class.class);
+      clazz.getMethod("arrayIndexScale", Class.class);
+      clazz.getMethod("getInt", Object.class, long.class);
+      clazz.getMethod("putInt", Object.class, long.class, int.class);
+      clazz.getMethod("getLong", Object.class, long.class);
+      clazz.getMethod("putLong", Object.class, long.class, long.class);
+      clazz.getMethod("getObject", Object.class, long.class);
+      clazz.getMethod("putObject", Object.class, long.class, Object.class);
+      clazz.getMethod("getByte", Object.class, long.class);
+      clazz.getMethod("putByte", Object.class, long.class, byte.class);
+      clazz.getMethod("getBoolean", Object.class, long.class);
+      clazz.getMethod("putBoolean", Object.class, long.class, boolean.class);
+      clazz.getMethod("getFloat", Object.class, long.class);
+      clazz.getMethod("putFloat", Object.class, long.class, float.class);
+      clazz.getMethod("getDouble", Object.class, long.class);
+      clazz.getMethod("putDouble", Object.class, long.class, double.class);
+
+      return true;
+    } catch (Throwable e) {
+      logger.log(
+          Level.WARNING,
+          "platform method missing - proto runtime falling back to safer methods: " + e);
+    }
+    return false;
   }
 
   private static boolean supportsUnsafeByteBufferOperations() {
-    boolean supported = false;
-    if (UNSAFE != null) {
-      try {
-        Class<?> clazz = UNSAFE.getClass();
-        // Methods for getting direct buffer address.
-        clazz.getMethod("objectFieldOffset", Field.class);
-        clazz.getMethod("getLong", Object.class, long.class);
-
-        clazz.getMethod("getByte", long.class);
-        clazz.getMethod("putByte", long.class, byte.class);
-        clazz.getMethod("getInt", long.class);
-        clazz.getMethod("putInt", long.class, int.class);
-        clazz.getMethod("getLong", long.class);
-        clazz.getMethod("putLong", long.class, long.class);
-        clazz.getMethod("setMemory", long.class, long.class, byte.class);
-        clazz.getMethod("copyMemory", long.class, long.class, long.class);
-        supported = true;
-      } catch (Throwable e) {
-        // Do nothing.
+    if (UNSAFE == null) {
+      return false;
+    }
+    try {
+      Class<?> clazz = UNSAFE.getClass();
+      // Methods for getting direct buffer address.
+      clazz.getMethod("objectFieldOffset", Field.class);
+      clazz.getMethod("getLong", Object.class, long.class);
+
+      if (bufferAddressField() == null) {
+        return false;
       }
+
+      clazz.getMethod("getByte", long.class);
+      clazz.getMethod("putByte", long.class, byte.class);
+      clazz.getMethod("getInt", long.class);
+      clazz.getMethod("putInt", long.class, int.class);
+      clazz.getMethod("getLong", long.class);
+      clazz.getMethod("putLong", long.class, long.class);
+      clazz.getMethod("copyMemory", long.class, long.class, long.class);
+      clazz.getMethod("copyMemory", Object.class, long.class, Object.class, long.class, long.class);
+      return true;
+    } catch (Throwable e) {
+      logger.log(
+          Level.WARNING,
+          "platform method missing - proto runtime falling back to safer methods: " + e);
     }
-    return supported;
+    return false;
   }
 
-  /**
-   * Get the base offset for byte arrays, or {@code -1} if {@code sun.misc.Unsafe} is not available.
-   */
-  private static int byteArrayBaseOffset() {
-    return HAS_UNSAFE_ARRAY_OPERATIONS ? UNSAFE.arrayBaseOffset(byte[].class) : -1;
+
+  /** Finds the address field within a direct {@link Buffer}. */
+  private static Field bufferAddressField() {
+    Field field = field(Buffer.class, "address");
+    return field != null && field.getType() == long.class ? field : null;
+  }
+
+  /** Finds the value field within a {@link String}. */
+  private static Field stringValueField() {
+    Field field = field(String.class, "value");
+    return field != null && field.getType() == char[].class ? field : null;
   }
 
   /**
@@ -274,7 +381,7 @@ final class UnsafeUtil {
    * available.
    */
   private static long fieldOffset(Field field) {
-    return field == null || UNSAFE == null ? -1 : UNSAFE.objectFieldOffset(field);
+    return field == null || MEMORY_ACCESSOR == null ? -1 : MEMORY_ACCESSOR.objectFieldOffset(field);
   }
 
   /**
@@ -292,4 +399,176 @@ final class UnsafeUtil {
     }
     return field;
   }
+
+  private abstract static class MemoryAccessor {
+
+    sun.misc.Unsafe unsafe;
+
+    MemoryAccessor(sun.misc.Unsafe unsafe) {
+      this.unsafe = unsafe;
+    }
+
+    public final long objectFieldOffset(Field field) {
+      return unsafe.objectFieldOffset(field);
+    }
+
+    public abstract byte getByte(Object target, long offset);
+
+    public abstract void putByte(Object target, long offset, byte value);
+
+    public final int getInt(Object target, long offset) {
+      return unsafe.getInt(target, offset);
+    }
+
+    public final void putInt(Object target, long offset, int value) {
+      unsafe.putInt(target, offset, value);
+    }
+
+    public final long getLong(Object target, long offset) {
+      return unsafe.getLong(target, offset);
+    }
+
+    public final void putLong(Object target, long offset, long value) {
+      unsafe.putLong(target, offset, value);
+    }
+
+    public abstract boolean getBoolean(Object target, long offset);
+
+    public abstract void putBoolean(Object target, long offset, boolean value);
+
+    public abstract float getFloat(Object target, long offset);
+
+    public abstract void putFloat(Object target, long offset, float value);
+
+    public abstract double getDouble(Object target, long offset);
+
+    public abstract void putDouble(Object target, long offset, double value);
+
+    public final Object getObject(Object target, long offset) {
+      return unsafe.getObject(target, offset);
+    }
+
+    public final void putObject(Object target, long offset, Object value) {
+      unsafe.putObject(target, offset, value);
+    }
+
+    public final int arrayBaseOffset(Class<?> clazz) {
+      return unsafe.arrayBaseOffset(clazz);
+    }
+
+    public final int arrayIndexScale(Class<?> clazz) {
+      return unsafe.arrayIndexScale(clazz);
+    }
+
+    public abstract byte getByte(long address);
+
+    public abstract void putByte(long address, byte value);
+
+    public abstract int getInt(long address);
+
+    public abstract void putInt(long address, int value);
+
+    public abstract long getLong(long address);
+
+    public abstract void putLong(long address, long value);
+
+    public abstract Object getStaticObject(Field field);
+    
+    public abstract void copyMemory(long srcOffset, byte[] target, long targetIndex, long length);
+    
+    public abstract void copyMemory(byte[] src, long srcIndex, long targetOffset, long length);
+  }
+
+  private static final class JvmMemoryAccessor extends MemoryAccessor {
+
+    JvmMemoryAccessor(sun.misc.Unsafe unsafe) {
+      super(unsafe);
+    }
+
+    @Override
+    public byte getByte(long address) {
+      return unsafe.getByte(address);
+    }
+
+    @Override
+    public void putByte(long address, byte value) {
+      unsafe.putByte(address, value);
+    }
+
+    @Override
+    public int getInt(long address) {
+      return unsafe.getInt(address);
+    }
+
+    @Override
+    public void putInt(long address, int value) {
+      unsafe.putInt(address, value);
+    }
+
+    @Override
+    public long getLong(long address) {
+      return unsafe.getLong(address);
+    }
+
+    @Override
+    public void putLong(long address, long value) {
+      unsafe.putLong(address, value);
+    }
+
+    @Override
+    public byte getByte(Object target, long offset) {
+      return unsafe.getByte(target, offset);
+    }
+
+    @Override
+    public void putByte(Object target, long offset, byte value) {
+      unsafe.putByte(target, offset, value);
+    }
+
+    @Override
+    public boolean getBoolean(Object target, long offset) {
+      return unsafe.getBoolean(target, offset);
+    }
+
+    @Override
+    public void putBoolean(Object target, long offset, boolean value) {
+      unsafe.putBoolean(target, offset, value);
+    }
+
+    @Override
+    public float getFloat(Object target, long offset) {
+      return unsafe.getFloat(target, offset);
+    }
+
+    @Override
+    public void putFloat(Object target, long offset, float value) {
+      unsafe.putFloat(target, offset, value);
+    }
+
+    @Override
+    public double getDouble(Object target, long offset) {
+      return unsafe.getDouble(target, offset);
+    }
+
+    @Override
+    public void putDouble(Object target, long offset, double value) {
+      unsafe.putDouble(target, offset, value);
+    }
+    
+    @Override 
+    public void copyMemory(long srcOffset, byte[] target, long targetIndex, long length) {
+      unsafe.copyMemory(null, srcOffset, target, BYTE_ARRAY_BASE_OFFSET + targetIndex, length);
+    }
+    
+    @Override
+    public void copyMemory(byte[] src, long srcIndex, long targetOffset, long length) {
+      unsafe.copyMemory(src, BYTE_ARRAY_BASE_OFFSET + srcIndex, null, targetOffset, length);
+    }
+
+    @Override
+    public Object getStaticObject(Field field) {
+      return getObject(unsafe.staticFieldBase(field), unsafe.staticFieldOffset(field));
+    }
+  }
+
 }
diff --git a/java/core/src/main/java/com/google/protobuf/Utf8.java b/java/core/src/main/java/com/google/protobuf/Utf8.java
index 5b80d405..de75fe6b 100644
--- a/java/core/src/main/java/com/google/protobuf/Utf8.java
+++ b/java/core/src/main/java/com/google/protobuf/Utf8.java
@@ -31,15 +31,18 @@
 package com.google.protobuf;
 
 import static com.google.protobuf.UnsafeUtil.addressOffset;
-import static com.google.protobuf.UnsafeUtil.getArrayBaseOffset;
 import static com.google.protobuf.UnsafeUtil.hasUnsafeArrayOperations;
 import static com.google.protobuf.UnsafeUtil.hasUnsafeByteBufferOperations;
 import static java.lang.Character.MAX_SURROGATE;
+import static java.lang.Character.MIN_HIGH_SURROGATE;
+import static java.lang.Character.MIN_LOW_SURROGATE;
+import static java.lang.Character.MIN_SUPPLEMENTARY_CODE_POINT;
 import static java.lang.Character.MIN_SURROGATE;
 import static java.lang.Character.isSurrogatePair;
 import static java.lang.Character.toCodePoint;
 
 import java.nio.ByteBuffer;
+import java.util.Arrays;
 
 /**
  * A set of low-level, high-performance static utility methods related
@@ -290,7 +293,7 @@ final class Utf8 {
         if (Character.MIN_SURROGATE <= c && c <= Character.MAX_SURROGATE) {
           // Check that we have a well-formed surrogate pair.
           int cp = Character.codePointAt(sequence, i);
-          if (cp < Character.MIN_SUPPLEMENTARY_CODE_POINT) {
+          if (cp < MIN_SUPPLEMENTARY_CODE_POINT) {
             throw new UnpairedSurrogateException(i, utf16Length);
           }
           i++;
@@ -332,6 +335,26 @@ final class Utf8 {
   }
 
   /**
+   * Decodes the given UTF-8 portion of the {@link ByteBuffer} into a {@link String}.
+   *
+   * @throws InvalidProtocolBufferException if the input is not valid UTF-8.
+   */
+  static String decodeUtf8(ByteBuffer buffer, int index, int size)
+      throws InvalidProtocolBufferException {
+    return processor.decodeUtf8(buffer, index, size);
+  }
+
+  /**
+   * Decodes the given UTF-8 encoded byte array slice into a {@link String}.
+   *
+   * @throws InvalidProtocolBufferException if the input is not valid UTF-8.
+   */
+  static String decodeUtf8(byte[] bytes, int index, int size)
+      throws InvalidProtocolBufferException {
+    return processor.decodeUtf8(bytes, index, size);
+  }
+
+  /**
    * Encodes the given characters to the target {@link ByteBuffer} using UTF-8 encoding.
    *
    * <p>Selects an optimal algorithm based on the type of {@link ByteBuffer} (i.e. heap or direct)
@@ -611,6 +634,116 @@ final class Utf8 {
     }
 
     /**
+     * Decodes the given byte array slice into a {@link String}.
+     *
+     * @throws InvalidProtocolBufferException if the byte array slice is not valid UTF-8.
+     */
+    abstract String decodeUtf8(byte[] bytes, int index, int size)
+        throws InvalidProtocolBufferException;
+
+    /**
+     * Decodes the given portion of the {@link ByteBuffer} into a {@link String}.
+     *
+     * @throws InvalidProtocolBufferException if the portion of the buffer is not valid UTF-8.
+     */
+    final String decodeUtf8(ByteBuffer buffer, int index, int size)
+        throws InvalidProtocolBufferException {
+      if (buffer.hasArray()) {
+        final int offset = buffer.arrayOffset();
+        return decodeUtf8(buffer.array(), offset + index, size);
+      } else if (buffer.isDirect()) {
+        return decodeUtf8Direct(buffer, index, size);
+      }
+      return decodeUtf8Default(buffer, index, size);
+    }
+
+    /**
+     * Decodes direct {@link ByteBuffer} instances into {@link String}.
+     */
+    abstract String decodeUtf8Direct(ByteBuffer buffer, int index, int size)
+        throws InvalidProtocolBufferException;
+
+    /**
+     * Decodes {@link ByteBuffer} instances using the {@link ByteBuffer} API rather than
+     * potentially faster approaches.
+     */
+    final String decodeUtf8Default(ByteBuffer buffer, int index, int size)
+        throws InvalidProtocolBufferException {
+      // Bitwise OR combines the sign bits so any negative value fails the check.
+      if ((index | size | buffer.limit() - index - size) < 0) {
+        throw new ArrayIndexOutOfBoundsException(
+            String.format("buffer limit=%d, index=%d, limit=%d", buffer.limit(), index, size));
+      }
+
+      int offset = index;
+      final int limit = offset + size;
+
+      // The longest possible resulting String is the same as the number of input bytes, when it is
+      // all ASCII. For other cases, this over-allocates and we will truncate in the end.
+      char[] resultArr = new char[size];
+      int resultPos = 0;
+
+      // Optimize for 100% ASCII (Hotspot loves small simple top-level loops like this).
+      // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
+      while (offset < limit) {
+        byte b = buffer.get(offset);
+        if (!DecodeUtil.isOneByte(b)) {
+          break;
+        }
+        offset++;
+        DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+      }
+
+      while (offset < limit) {
+        byte byte1 = buffer.get(offset++);
+        if (DecodeUtil.isOneByte(byte1)) {
+          DecodeUtil.handleOneByte(byte1, resultArr, resultPos++);
+          // It's common for there to be multiple ASCII characters in a run mixed in, so add an
+          // extra optimized loop to take care of these runs.
+          while (offset < limit) {
+            byte b = buffer.get(offset);
+            if (!DecodeUtil.isOneByte(b)) {
+              break;
+            }
+            offset++;
+            DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+          }
+        } else if (DecodeUtil.isTwoBytes(byte1)) {
+          if (offset >= limit) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleTwoBytes(
+              byte1, /* byte2 */ buffer.get(offset++), resultArr, resultPos++);
+        } else if (DecodeUtil.isThreeBytes(byte1)) {
+          if (offset >= limit - 1) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleThreeBytes(
+              byte1,
+              /* byte2 */ buffer.get(offset++),
+              /* byte3 */ buffer.get(offset++),
+              resultArr,
+              resultPos++);
+        } else {
+          if (offset >= limit - 2) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleFourBytes(
+              byte1,
+              /* byte2 */ buffer.get(offset++),
+              /* byte3 */ buffer.get(offset++),
+              /* byte4 */ buffer.get(offset++),
+              resultArr,
+              resultPos++);
+          // 4-byte case requires two chars.
+          resultPos++;
+        }
+      }
+
+      return new String(resultArr, 0, resultPos);
+    }
+
+    /**
      * Encodes an input character sequence ({@code in}) to UTF-8 in the target array ({@code out}).
      * For a string, this method is similar to
      * <pre>{@code
@@ -852,6 +985,88 @@ final class Utf8 {
     }
 
     @Override
+    String decodeUtf8(byte[] bytes, int index, int size) throws InvalidProtocolBufferException {
+      // Bitwise OR combines the sign bits so any negative value fails the check.
+      if ((index | size | bytes.length - index - size) < 0) {
+        throw new ArrayIndexOutOfBoundsException(
+            String.format("buffer length=%d, index=%d, size=%d", bytes.length, index, size));
+      }
+
+      int offset = index;
+      final int limit = offset + size;
+
+      // The longest possible resulting String is the same as the number of input bytes, when it is
+      // all ASCII. For other cases, this over-allocates and we will truncate in the end.
+      char[] resultArr = new char[size];
+      int resultPos = 0;
+
+      // Optimize for 100% ASCII (Hotspot loves small simple top-level loops like this).
+      // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
+      while (offset < limit) {
+        byte b = bytes[offset];
+        if (!DecodeUtil.isOneByte(b)) {
+          break;
+        }
+        offset++;
+        DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+      }
+
+      while (offset < limit) {
+        byte byte1 = bytes[offset++];
+        if (DecodeUtil.isOneByte(byte1)) {
+          DecodeUtil.handleOneByte(byte1, resultArr, resultPos++);
+          // It's common for there to be multiple ASCII characters in a run mixed in, so add an
+          // extra optimized loop to take care of these runs.
+          while (offset < limit) {
+            byte b = bytes[offset];
+            if (!DecodeUtil.isOneByte(b)) {
+              break;
+            }
+            offset++;
+            DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+          }
+        } else if (DecodeUtil.isTwoBytes(byte1)) {
+          if (offset >= limit) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleTwoBytes(byte1, /* byte2 */ bytes[offset++], resultArr, resultPos++);
+        } else if (DecodeUtil.isThreeBytes(byte1)) {
+          if (offset >= limit - 1) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleThreeBytes(
+              byte1,
+              /* byte2 */ bytes[offset++],
+              /* byte3 */ bytes[offset++],
+              resultArr,
+              resultPos++);
+        } else {
+          if (offset >= limit - 2) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleFourBytes(
+              byte1,
+              /* byte2 */ bytes[offset++],
+              /* byte3 */ bytes[offset++],
+              /* byte4 */ bytes[offset++],
+              resultArr,
+              resultPos++);
+          // 4-byte case requires two chars.
+          resultPos++;
+        }
+      }
+
+      return new String(resultArr, 0, resultPos);
+    }
+
+    @Override
+    String decodeUtf8Direct(ByteBuffer buffer, int index, int size)
+        throws InvalidProtocolBufferException {
+      // For safe processing, we have to use the ByteBufferAPI.
+      return decodeUtf8Default(buffer, index, size);
+    }
+
+    @Override
     int encodeUtf8(CharSequence in, byte[] out, int offset, int length) {
       int utf16Length = in.length();
       int j = offset;
@@ -997,12 +1212,13 @@ final class Utf8 {
 
     @Override
     int partialIsValidUtf8(int state, byte[] bytes, final int index, final int limit) {
+      // Bitwise OR combines the sign bits so any negative value fails the check.
       if ((index | limit | bytes.length - limit) < 0) {
         throw new ArrayIndexOutOfBoundsException(
             String.format("Array length=%d, index=%d, limit=%d", bytes.length, index, limit));
       }
-      long offset = getArrayBaseOffset() + index;
-      final long offsetLimit = getArrayBaseOffset() + limit;
+      long offset = index;
+      final long offsetLimit = limit;
       if (state != COMPLETE) {
         // The previous decoding operation was incomplete (or malformed).
         // We look for a well-formed sequence consisting of bytes from
@@ -1092,6 +1308,7 @@ final class Utf8 {
     @Override
     int partialIsValidUtf8Direct(
         final int state, ByteBuffer buffer, final int index, final int limit) {
+      // Bitwise OR combines the sign bits so any negative value fails the check.
       if ((index | limit | buffer.limit() - limit) < 0) {
         throw new ArrayIndexOutOfBoundsException(
             String.format("buffer limit=%d, index=%d, limit=%d", buffer.limit(), index, limit));
@@ -1186,8 +1403,159 @@ final class Utf8 {
     }
 
     @Override
+    String decodeUtf8(byte[] bytes, int index, int size) throws InvalidProtocolBufferException {
+      if ((index | size | bytes.length - index - size) < 0) {
+        throw new ArrayIndexOutOfBoundsException(
+            String.format("buffer length=%d, index=%d, size=%d", bytes.length, index, size));
+      }
+
+      int offset = index;
+      final int limit = offset + size;
+
+      // The longest possible resulting String is the same as the number of input bytes, when it is
+      // all ASCII. For other cases, this over-allocates and we will truncate in the end.
+      char[] resultArr = new char[size];
+      int resultPos = 0;
+
+      // Optimize for 100% ASCII (Hotspot loves small simple top-level loops like this).
+      // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
+      while (offset < limit) {
+        byte b = UnsafeUtil.getByte(bytes, offset);
+        if (!DecodeUtil.isOneByte(b)) {
+          break;
+        }
+        offset++;
+        DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+      }
+
+      while (offset < limit) {
+        byte byte1 = UnsafeUtil.getByte(bytes, offset++);
+        if (DecodeUtil.isOneByte(byte1)) {
+          DecodeUtil.handleOneByte(byte1, resultArr, resultPos++);
+          // It's common for there to be multiple ASCII characters in a run mixed in, so add an
+          // extra optimized loop to take care of these runs.
+          while (offset < limit) {
+            byte b = UnsafeUtil.getByte(bytes, offset);
+            if (!DecodeUtil.isOneByte(b)) {
+              break;
+            }
+            offset++;
+            DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+          }
+        } else if (DecodeUtil.isTwoBytes(byte1)) {
+          if (offset >= limit) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleTwoBytes(
+              byte1, /* byte2 */ UnsafeUtil.getByte(bytes, offset++), resultArr, resultPos++);
+        } else if (DecodeUtil.isThreeBytes(byte1)) {
+          if (offset >= limit - 1) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleThreeBytes(
+              byte1,
+              /* byte2 */ UnsafeUtil.getByte(bytes, offset++),
+              /* byte3 */ UnsafeUtil.getByte(bytes, offset++),
+              resultArr,
+              resultPos++);
+        } else {
+          if (offset >= limit - 2) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleFourBytes(
+              byte1,
+              /* byte2 */ UnsafeUtil.getByte(bytes, offset++),
+              /* byte3 */ UnsafeUtil.getByte(bytes, offset++),
+              /* byte4 */ UnsafeUtil.getByte(bytes, offset++),
+              resultArr,
+              resultPos++);
+          // 4-byte case requires two chars.
+          resultPos++;
+        }
+      }
+
+      return new String(resultArr, 0, resultPos);
+    }
+
+    @Override
+    String decodeUtf8Direct(ByteBuffer buffer, int index, int size)
+        throws InvalidProtocolBufferException {
+      // Bitwise OR combines the sign bits so any negative value fails the check.
+      if ((index | size | buffer.limit() - index - size) < 0) {
+        throw new ArrayIndexOutOfBoundsException(
+            String.format("buffer limit=%d, index=%d, limit=%d", buffer.limit(), index, size));
+      }
+      long address = UnsafeUtil.addressOffset(buffer) + index;
+      final long addressLimit = address + size;
+
+      // The longest possible resulting String is the same as the number of input bytes, when it is
+      // all ASCII. For other cases, this over-allocates and we will truncate in the end.
+      char[] resultArr = new char[size];
+      int resultPos = 0;
+
+      // Optimize for 100% ASCII (Hotspot loves small simple top-level loops like this).
+      // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
+      while (address < addressLimit) {
+        byte b = UnsafeUtil.getByte(address);
+        if (!DecodeUtil.isOneByte(b)) {
+          break;
+        }
+        address++;
+        DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+      }
+
+      while (address < addressLimit) {
+        byte byte1 = UnsafeUtil.getByte(address++);
+        if (DecodeUtil.isOneByte(byte1)) {
+          DecodeUtil.handleOneByte(byte1, resultArr, resultPos++);
+          // It's common for there to be multiple ASCII characters in a run mixed in, so add an
+          // extra optimized loop to take care of these runs.
+          while (address < addressLimit) {
+            byte b = UnsafeUtil.getByte(address);
+            if (!DecodeUtil.isOneByte(b)) {
+              break;
+            }
+            address++;
+            DecodeUtil.handleOneByte(b, resultArr, resultPos++);
+          }
+        } else if (DecodeUtil.isTwoBytes(byte1)) {
+          if (address >= addressLimit) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleTwoBytes(
+              byte1, /* byte2 */ UnsafeUtil.getByte(address++), resultArr, resultPos++);
+        } else if (DecodeUtil.isThreeBytes(byte1)) {
+          if (address >= addressLimit - 1) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleThreeBytes(
+              byte1,
+              /* byte2 */ UnsafeUtil.getByte(address++),
+              /* byte3 */ UnsafeUtil.getByte(address++),
+              resultArr,
+              resultPos++);
+        } else {
+          if (address >= addressLimit - 2) {
+            throw InvalidProtocolBufferException.invalidUtf8();
+          }
+          DecodeUtil.handleFourBytes(
+              byte1,
+              /* byte2 */ UnsafeUtil.getByte(address++),
+              /* byte3 */ UnsafeUtil.getByte(address++),
+              /* byte4 */ UnsafeUtil.getByte(address++),
+              resultArr,
+              resultPos++);
+          // 4-byte case requires two chars.
+          resultPos++;
+        }
+      }
+
+      return new String(resultArr, 0, resultPos);
+    }
+
+    @Override
     int encodeUtf8(final CharSequence in, final byte[] out, final int offset, final int length) {
-      long outIx = getArrayBaseOffset() + offset;
+      long outIx = offset;
       final long outLimit = outIx + length;
       final int inLimit = in.length();
       if (inLimit > length || out.length - length < offset) {
@@ -1204,7 +1572,7 @@ final class Utf8 {
       }
       if (inIx == inLimit) {
         // We're done, it was ASCII encoded.
-        return (int) (outIx - getArrayBaseOffset());
+        return (int) outIx;
       }
 
       for (char c; inIx < inLimit; ++inIx) {
@@ -1243,7 +1611,7 @@ final class Utf8 {
       }
 
       // All bytes have been encoded.
-      return (int) (outIx - getArrayBaseOffset());
+      return (int) outIx;
     }
 
     @Override
@@ -1321,31 +1689,17 @@ final class Utf8 {
      */
     private static int unsafeEstimateConsecutiveAscii(
         byte[] bytes, long offset, final int maxChars) {
-      int remaining = maxChars;
-      if (remaining < UNSAFE_COUNT_ASCII_THRESHOLD) {
+      if (maxChars < UNSAFE_COUNT_ASCII_THRESHOLD) {
         // Don't bother with small strings.
         return 0;
       }
 
-      // Read bytes until 8-byte aligned so that we can read longs in the loop below.
-      // Byte arrays are already either 8 or 16-byte aligned, so we just need to make sure that
-      // the index (relative to the start of the array) is also 8-byte aligned. We do this by
-      // ANDing the index with 7 to determine the number of bytes that need to be read before
-      // we're 8-byte aligned.
-      final int unaligned = (int) offset & 7;
-      for (int j = unaligned; j > 0; j--) {
+      for (int i = 0; i < maxChars; i++) {
         if (UnsafeUtil.getByte(bytes, offset++) < 0) {
-          return unaligned - j;
+          return i;
         }
       }
-
-      // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
-      // To speed things up further, we're reading longs instead of bytes so we use a mask to
-      // determine if any byte in the current long is non-ASCII.
-      remaining -= unaligned;
-      for (; remaining >= 8 && (UnsafeUtil.getLong(bytes, offset) & ASCII_MASK_LONG) == 0;
-          offset += 8, remaining -= 8) {}
-      return maxChars - remaining;
+      return maxChars;
     }
 
     /**
@@ -1362,7 +1716,7 @@ final class Utf8 {
       // Read bytes until 8-byte aligned so that we can read longs in the loop below.
       // We do this by ANDing the address with 7 to determine the number of bytes that need to
       // be read before we're 8-byte aligned.
-      final int unaligned = (int) address & 7;
+      final int unaligned = 8 - ((int) address & 7);
       for (int j = unaligned; j > 0; j--) {
         if (UnsafeUtil.getByte(address++) < 0) {
           return unaligned - j;
@@ -1569,5 +1923,112 @@ final class Utf8 {
     }
   }
 
+  /**
+   * Utility methods for decoding bytes into {@link String}. Callers are responsible for extracting
+   * bytes (possibly using Unsafe methods), and checking remaining bytes. All other UTF-8 validity
+   * checks and codepoint conversion happen in this class.
+   */
+  private static class DecodeUtil {
+
+    /**
+     * Returns whether this is a single-byte codepoint (i.e., ASCII) with the form '0XXXXXXX'.
+     */
+    private static boolean isOneByte(byte b) {
+      return b >= 0;
+    }
+
+    /**
+     * Returns whether this is a two-byte codepoint with the form '10XXXXXX'.
+     */
+    private static boolean isTwoBytes(byte b) {
+      return b < (byte) 0xE0;
+    }
+
+    /**
+     * Returns whether this is a three-byte codepoint with the form '110XXXXX'.
+     */
+    private static boolean isThreeBytes(byte b) {
+      return b < (byte) 0xF0;
+    }
+
+    private static void handleOneByte(byte byte1, char[] resultArr, int resultPos) {
+      resultArr[resultPos] = (char) byte1;
+    }
+
+    private static void handleTwoBytes(
+        byte byte1, byte byte2, char[] resultArr, int resultPos)
+        throws InvalidProtocolBufferException {
+      // Simultaneously checks for illegal trailing-byte in leading position (<= '11000000') and
+      // overlong 2-byte, '11000001'.
+      if (byte1 < (byte) 0xC2
+          || isNotTrailingByte(byte2)) {
+        throw InvalidProtocolBufferException.invalidUtf8();
+      }
+      resultArr[resultPos] = (char) (((byte1 & 0x1F) << 6) | trailingByteValue(byte2));
+    }
+
+    private static void handleThreeBytes(
+        byte byte1, byte byte2, byte byte3, char[] resultArr, int resultPos)
+        throws InvalidProtocolBufferException {
+      if (isNotTrailingByte(byte2)
+          // overlong? 5 most significant bits must not all be zero
+          || (byte1 == (byte) 0xE0 && byte2 < (byte) 0xA0)
+          // check for illegal surrogate codepoints
+          || (byte1 == (byte) 0xED && byte2 >= (byte) 0xA0)
+          || isNotTrailingByte(byte3)) {
+        throw InvalidProtocolBufferException.invalidUtf8();
+      }
+      resultArr[resultPos] = (char)
+          (((byte1 & 0x0F) << 12) | (trailingByteValue(byte2) << 6) | trailingByteValue(byte3));
+    }
+
+    private static void handleFourBytes(
+        byte byte1, byte byte2, byte byte3, byte byte4, char[] resultArr, int resultPos)
+        throws InvalidProtocolBufferException{
+      if (isNotTrailingByte(byte2)
+          // Check that 1 <= plane <= 16.  Tricky optimized form of:
+          //   valid 4-byte leading byte?
+          // if (byte1 > (byte) 0xF4 ||
+          //   overlong? 4 most significant bits must not all be zero
+          //     byte1 == (byte) 0xF0 && byte2 < (byte) 0x90 ||
+          //   codepoint larger than the highest code point (U+10FFFF)?
+          //     byte1 == (byte) 0xF4 && byte2 > (byte) 0x8F)
+          || (((byte1 << 28) + (byte2 - (byte) 0x90)) >> 30) != 0
+          || isNotTrailingByte(byte3)
+          || isNotTrailingByte(byte4)) {
+        throw InvalidProtocolBufferException.invalidUtf8();
+      }
+      int codepoint = ((byte1 & 0x07) << 18)
+          | (trailingByteValue(byte2) << 12)
+          | (trailingByteValue(byte3) << 6)
+          | trailingByteValue(byte4);
+      resultArr[resultPos] = DecodeUtil.highSurrogate(codepoint);
+      resultArr[resultPos + 1] = DecodeUtil.lowSurrogate(codepoint);
+    }
+
+    /**
+     * Returns whether the byte is not a valid continuation of the form '10XXXXXX'.
+     */
+    private static boolean isNotTrailingByte(byte b) {
+      return b > (byte) 0xBF;
+    }
+
+    /**
+     * Returns the actual value of the trailing byte (removes the prefix '10') for composition.
+     */
+    private static int trailingByteValue(byte b) {
+      return b & 0x3F;
+    }
+
+    private static char highSurrogate(int codePoint) {
+      return (char) ((MIN_HIGH_SURROGATE - (MIN_SUPPLEMENTARY_CODE_POINT >>> 10))
+          + (codePoint >>> 10));
+    }
+
+    private static char lowSurrogate(int codePoint) {
+      return (char) (MIN_LOW_SURROGATE + (codePoint & 0x3ff));
+    }
+  }
+
   private Utf8() {}
 }
diff --git a/java/core/src/main/java/com/google/protobuf/WireFormat.java b/java/core/src/main/java/com/google/protobuf/WireFormat.java
index 0b0cdb7d..8b837ee5 100644
--- a/java/core/src/main/java/com/google/protobuf/WireFormat.java
+++ b/java/core/src/main/java/com/google/protobuf/WireFormat.java
@@ -47,8 +47,10 @@ public final class WireFormat {
   // Do not allow instantiation.
   private WireFormat() {}
 
-  static final int FIXED_32_SIZE = 4;
-  static final int FIXED_64_SIZE = 8;
+  static final int FIXED32_SIZE = 4;
+  static final int FIXED64_SIZE = 8;
+  static final int MAX_VARINT32_SIZE = 5;
+  static final int MAX_VARINT64_SIZE = 10;
   static final int MAX_VARINT_SIZE = 10;
 
   public static final int WIRETYPE_VARINT           = 0;
diff --git a/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java b/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java
index 622e36a4..cb2d34eb 100644
--- a/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/AbstractMessageTest.java
@@ -30,6 +30,9 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.TestUtil.TEST_REQUIRED_INITIALIZED;
+import static com.google.protobuf.TestUtil.TEST_REQUIRED_UNINITIALIZED;
+
 import com.google.protobuf.Descriptors.FieldDescriptor;
 import protobuf_unittest.UnittestOptimizeFor.TestOptimizedForSize;
 import protobuf_unittest.UnittestProto;
@@ -346,11 +349,6 @@ public class AbstractMessageTest extends TestCase {
   // -----------------------------------------------------------------
   // Tests for isInitialized().
 
-  private static final TestRequired TEST_REQUIRED_UNINITIALIZED =
-    TestRequired.getDefaultInstance();
-  private static final TestRequired TEST_REQUIRED_INITIALIZED =
-    TestRequired.newBuilder().setA(1).setB(2).setC(3).build();
-
   public void testIsInitialized() throws Exception {
     TestRequired.Builder builder = TestRequired.newBuilder();
     AbstractMessageWrapper.Builder abstractBuilder =
@@ -380,7 +378,7 @@ public class AbstractMessageTest extends TestCase {
     builder.setOptionalMessage(TEST_REQUIRED_UNINITIALIZED);
     assertFalse(abstractBuilder.isInitialized());
     assertEquals(
-        "optional_message.a, optional_message.b, optional_message.c",
+        "optional_message.b, optional_message.c",
         abstractBuilder.getInitializationErrorString());
 
     builder.setOptionalMessage(TEST_REQUIRED_INITIALIZED);
@@ -390,7 +388,7 @@ public class AbstractMessageTest extends TestCase {
     builder.addRepeatedMessage(TEST_REQUIRED_UNINITIALIZED);
     assertFalse(abstractBuilder.isInitialized());
     assertEquals(
-        "repeated_message[0].a, repeated_message[0].b, repeated_message[0].c",
+        "repeated_message[0].b, repeated_message[0].c",
         abstractBuilder.getInitializationErrorString());
 
     builder.setRepeatedMessage(0, TEST_REQUIRED_INITIALIZED);
diff --git a/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java b/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java
index 18132e9e..4906763c 100644
--- a/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/BooleanArrayListTest.java
@@ -32,6 +32,7 @@ package com.google.protobuf;
 
 import static java.util.Arrays.asList;
 
+import com.google.protobuf.Internal.BooleanList;
 import java.util.Collections;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -297,6 +298,20 @@ public class BooleanArrayListTest extends TestCase {
     }
   }
 
+  public void testRemoveEndOfCapacity() {
+    BooleanList toRemove = BooleanArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addBoolean(true);
+    toRemove.remove(0);
+    assertEquals(0, toRemove.size());
+  }
+
+  public void testSublistRemoveEndOfCapacity() {
+    BooleanList toRemove = BooleanArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addBoolean(true);
+    toRemove.subList(0, 1).clear();
+    assertEquals(0, toRemove.size());
+  }
+
   private void assertImmutable(BooleanArrayList list) {
 
     try {
diff --git a/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java b/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java
index cc65d19a..50b87ae3 100644
--- a/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java
+++ b/java/core/src/test/java/com/google/protobuf/CheckUtf8Test.java
@@ -34,7 +34,7 @@ import proto2_test_check_utf8.TestCheckUtf8.BytesWrapper;
 import proto2_test_check_utf8.TestCheckUtf8.StringWrapper;
 import proto2_test_check_utf8_size.TestCheckUtf8Size.BytesWrapperSize;
 import proto2_test_check_utf8_size.TestCheckUtf8Size.StringWrapperSize;
-
+import java.io.ByteArrayInputStream;
 import junit.framework.TestCase;
 
 /**
@@ -90,14 +90,9 @@ public class CheckUtf8Test extends TestCase {
   }
 
   public void testParseRequiredStringWithBadUtf8() throws Exception {
-    ByteString serialized =
-        BytesWrapper.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteString();
-    try {
-      StringWrapper.parser().parseFrom(serialized);
-      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
-    } catch (InvalidProtocolBufferException exception) {
-      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
-    }
+    byte[] serialized =
+        BytesWrapper.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
+    assertParseBadUtf8(StringWrapper.getDefaultInstance(), serialized);
   }
 
   public void testBuildRequiredStringWithBadUtf8Size() throws Exception {
@@ -128,14 +123,36 @@ public class CheckUtf8Test extends TestCase {
   }
 
   public void testParseRequiredStringWithBadUtf8Size() throws Exception {
-    ByteString serialized =
-        BytesWrapperSize.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteString();
+    byte[] serialized =
+        BytesWrapperSize.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
+    assertParseBadUtf8(StringWrapperSize.getDefaultInstance(), serialized);
+  }
+
+  private void assertParseBadUtf8(MessageLite defaultInstance, byte[] data) throws Exception {
+    // Check combinations of (parser vs. builder) x (byte[] vs. InputStream)
+    try {
+      defaultInstance.getParserForType().parseFrom(data);
+      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
+    } catch (InvalidProtocolBufferException exception) {
+      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
+    }
+    try {
+      defaultInstance.newBuilderForType().mergeFrom(data);
+      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
+    } catch (InvalidProtocolBufferException exception) {
+      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
+    }
     try {
-      StringWrapperSize.parser().parseFrom(serialized);
+      defaultInstance.getParserForType().parseFrom(new ByteArrayInputStream(data));
+      fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
+    } catch (InvalidProtocolBufferException exception) {
+      assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
+    }
+    try {
+      defaultInstance.newBuilderForType().mergeFrom(new ByteArrayInputStream(data));
       fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
     } catch (InvalidProtocolBufferException exception) {
       assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
     }
   }
-
 }
diff --git a/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java b/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
index e440c7db..5ea6b79c 100644
--- a/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
+++ b/java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
@@ -41,6 +41,8 @@ import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
 import junit.framework.TestCase;
 
 /**
@@ -49,6 +51,9 @@ import junit.framework.TestCase;
  * @author kenton@google.com Kenton Varda
  */
 public class CodedInputStreamTest extends TestCase {
+  
+  private static final int DEFAULT_BLOCK_SIZE = 4096; 
+  
   private enum InputType {
     ARRAY {
       @Override
@@ -76,7 +81,43 @@ public class CodedInputStreamTest extends TestCase {
       CodedInputStream newDecoder(byte[] data, int blockSize) {
         return CodedInputStream.newInstance(new SmallBlockInputStream(data, blockSize));
       }
+    },
+    ITER_DIRECT {
+      @Override
+      CodedInputStream newDecoder(byte[] data, int blockSize) {
+        if (blockSize > DEFAULT_BLOCK_SIZE) {
+          blockSize = DEFAULT_BLOCK_SIZE;
+        }
+        ArrayList <ByteBuffer> input = new ArrayList <ByteBuffer>();
+        for (int i = 0; i < data.length; i += blockSize) {
+          int rl = Math.min(blockSize, data.length - i); 
+          ByteBuffer rb = ByteBuffer.allocateDirect(rl); 
+          rb.put(data, i, rl);
+          rb.flip();
+          input.add(rb);
+        }
+        return CodedInputStream.newInstance(input);
+      }
+    },
+    STREAM_ITER_DIRECT {
+      @Override
+      CodedInputStream newDecoder(byte[] data, int blockSize) {
+        if (blockSize > DEFAULT_BLOCK_SIZE) {
+          blockSize = DEFAULT_BLOCK_SIZE;
+        }
+        ArrayList <ByteBuffer> input = new ArrayList <ByteBuffer>();
+        for (int i = 0; i < data.length; i += blockSize) {
+          int rl = Math.min(blockSize, data.length - i); 
+          ByteBuffer rb = ByteBuffer.allocateDirect(rl); 
+          rb.put(data, i, rl);
+          rb.flip();
+          input.add(rb);
+        }
+        return CodedInputStream.newInstance(new IterableByteBufferInputStream(input));
+      }
     };
+    
+    
 
     CodedInputStream newDecoder(byte[] data) {
       return newDecoder(data, data.length);
@@ -613,6 +654,82 @@ public class CodedInputStreamTest extends TestCase {
       checkSizeLimitExceeded(expected);
     }
   }
+  
+  public void testRefillBufferWithCorrectSize() throws Exception {
+    // NOTE: refillBuffer only applies to the stream-backed CIS.
+    byte[] bytes = "123456789".getBytes("UTF-8");
+    ByteArrayOutputStream rawOutput = new ByteArrayOutputStream();
+    CodedOutputStream output = CodedOutputStream.newInstance(rawOutput, bytes.length);
+
+    int tag = WireFormat.makeTag(1, WireFormat.WIRETYPE_LENGTH_DELIMITED);
+    output.writeRawVarint32(tag);
+    output.writeRawVarint32(bytes.length);
+    output.writeRawBytes(bytes);
+    output.writeRawVarint32(tag);
+    output.writeRawVarint32(bytes.length);
+    output.writeRawBytes(bytes);
+    output.writeRawByte(4);
+    output.flush();
+
+    // Input is two string with length 9 and one raw byte.
+    byte[] rawInput = rawOutput.toByteArray(); 
+    for (int inputStreamBufferLength = 8; 
+        inputStreamBufferLength <= rawInput.length + 1; inputStreamBufferLength++) {
+      CodedInputStream input = CodedInputStream.newInstance(
+              new ByteArrayInputStream(rawInput), inputStreamBufferLength);
+      input.setSizeLimit(rawInput.length - 1);
+      input.readString();
+      input.readString(); 
+      try {
+        input.readRawByte(); // Hits limit.
+        fail("Should have thrown an exception!");
+      } catch (InvalidProtocolBufferException expected) {
+        checkSizeLimitExceeded(expected);
+      }
+    }
+  }
+
+  public void testIsAtEnd() throws Exception {
+    CodedInputStream input = CodedInputStream.newInstance(
+        new ByteArrayInputStream(new byte[5]));
+    try {   
+      for (int i = 0; i < 5; i++) {
+        assertEquals(false, input.isAtEnd());
+        input.readRawByte();
+      }
+      assertEquals(true, input.isAtEnd());
+    } catch (Exception e) {
+      fail("Catch exception in the testIsAtEnd");
+    }
+  }
+
+  public void testCurrentLimitExceeded() throws Exception {
+    byte[] bytes = "123456789".getBytes("UTF-8");
+    ByteArrayOutputStream rawOutput = new ByteArrayOutputStream();
+    CodedOutputStream output = CodedOutputStream.newInstance(rawOutput, bytes.length);
+
+    int tag = WireFormat.makeTag(1, WireFormat.WIRETYPE_LENGTH_DELIMITED);
+    output.writeRawVarint32(tag);
+    output.writeRawVarint32(bytes.length);
+    output.writeRawBytes(bytes);
+    output.flush();
+
+    byte[] rawInput = rawOutput.toByteArray();
+    CodedInputStream input = CodedInputStream.newInstance(
+              new ByteArrayInputStream(rawInput));
+    // The length of the whole rawInput
+    input.setSizeLimit(11);
+    // Some number that is smaller than the rawInput's length
+    // but larger than 2 
+    input.pushLimit(5);
+    try {
+      input.readString();
+      fail("Should have thrown an exception");
+    } catch (InvalidProtocolBufferException expected) {
+      assertEquals(expected.getMessage(), 
+          InvalidProtocolBufferException.truncatedMessage().getMessage());
+    }
+  }
 
   public void testSizeLimitMultipleMessages() throws Exception {
     // NOTE: Size limit only applies to the stream-backed CIS.
@@ -807,6 +924,52 @@ public class CodedInputStreamTest extends TestCase {
     }
   }
 
+  public void testReadLargeByteStringFromInputStream() throws Exception {
+    byte[] bytes = new byte[1024 * 1024];
+    for (int i = 0; i < bytes.length; i++) {
+      bytes[i] = (byte) (i & 0xFF);
+    }
+    ByteString.Output rawOutput = ByteString.newOutput();
+    CodedOutputStream output = CodedOutputStream.newInstance(rawOutput);
+    output.writeRawVarint32(bytes.length);
+    output.writeRawBytes(bytes);
+    output.flush();
+    byte[] data = rawOutput.toByteString().toByteArray();
+
+    CodedInputStream input = CodedInputStream.newInstance(
+        new ByteArrayInputStream(data) {
+          @Override
+          public synchronized int available() {
+            return 0;
+          }
+        });
+    ByteString result = input.readBytes();
+    assertEquals(ByteString.copyFrom(bytes), result);
+  }
+
+  public void testReadLargeByteArrayFromInputStream() throws Exception {
+    byte[] bytes = new byte[1024 * 1024];
+    for (int i = 0; i < bytes.length; i++) {
+      bytes[i] = (byte) (i & 0xFF);
+    }
+    ByteString.Output rawOutput = ByteString.newOutput();
+    CodedOutputStream output = CodedOutputStream.newInstance(rawOutput);
+    output.writeRawVarint32(bytes.length);
+    output.writeRawBytes(bytes);
+    output.flush();
+    byte[] data = rawOutput.toByteString().toByteArray();
+
+    CodedInputStream input = CodedInputStream.newInstance(
+        new ByteArrayInputStream(data) {
+          @Override
+          public synchronized int available() {
+            return 0;
+          }
+        });
+    byte[] result = input.readByteArray();
+    assertTrue(Arrays.equals(bytes, result));
+  }
+
   public void testReadByteBuffer() throws Exception {
     ByteString.Output rawOutput = ByteString.newOutput();
     CodedOutputStream output = CodedOutputStream.newInstance(rawOutput);
@@ -871,7 +1034,9 @@ public class CodedInputStreamTest extends TestCase {
     byte[] data = byteArrayStream.toByteArray();
 
     for (InputType inputType : InputType.values()) {
-      if (inputType == InputType.STREAM) {
+      if (inputType == InputType.STREAM 
+          || inputType == InputType.STREAM_ITER_DIRECT 
+          || inputType == InputType.ITER_DIRECT) {
         // Aliasing doesn't apply to stream-backed CIS.
         continue;
       }
@@ -896,7 +1061,7 @@ public class CodedInputStreamTest extends TestCase {
       assertEquals(inputType.name(), (byte) 89, result.get());
 
       // Enable aliasing
-      inputStream = inputType.newDecoder(data);
+      inputStream = inputType.newDecoder(data, data.length);
       inputStream.enableAliasing(true);
       result = inputStream.readByteBuffer();
       assertEquals(inputType.name(), 0, result.capacity());
diff --git a/java/core/src/test/java/com/google/protobuf/DecodeUtf8Test.java b/java/core/src/test/java/com/google/protobuf/DecodeUtf8Test.java
new file mode 100644
index 00000000..359d4d74
--- /dev/null
+++ b/java/core/src/test/java/com/google/protobuf/DecodeUtf8Test.java
@@ -0,0 +1,325 @@
+package com.google.protobuf;
+
+import com.google.protobuf.Utf8.Processor;
+import com.google.protobuf.Utf8.SafeProcessor;
+import com.google.protobuf.Utf8.UnsafeProcessor;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Logger;
+import junit.framework.TestCase;
+
+public class DecodeUtf8Test extends TestCase {
+  private static Logger logger = Logger.getLogger(DecodeUtf8Test.class.getName());
+
+  private static final Processor SAFE_PROCESSOR = new SafeProcessor();
+  private static final Processor UNSAFE_PROCESSOR = new UnsafeProcessor();
+
+  public void testRoundTripAllValidChars() throws Exception {
+    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
+      if (i < Character.MIN_SURROGATE || i > Character.MAX_SURROGATE) {
+        String str = new String(Character.toChars(i));
+        assertRoundTrips(str);
+      }
+    }
+  }
+
+  // Test all 1, 2, 3 invalid byte combinations. Valid ones would have been covered above.
+
+  public void testOneByte() throws Exception {
+    int valid = 0;
+    for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; i++) {
+      ByteString bs = ByteString.copyFrom(new byte[] { (byte) i });
+      if (!bs.isValidUtf8()) {
+        assertInvalid(bs.toByteArray());
+      } else {
+        valid++;
+      }
+    }
+    assertEquals(IsValidUtf8TestUtil.EXPECTED_ONE_BYTE_ROUNDTRIPPABLE_COUNT, valid);
+  }
+
+  public void testTwoBytes() throws Exception {
+    int valid = 0;
+    for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; i++) {
+      for (int j = Byte.MIN_VALUE; j <= Byte.MAX_VALUE; j++) {
+        ByteString bs = ByteString.copyFrom(new byte[]{(byte) i, (byte) j});
+        if (!bs.isValidUtf8()) {
+          assertInvalid(bs.toByteArray());
+        } else {
+          valid++;
+        }
+      }
+    }
+    assertEquals(IsValidUtf8TestUtil.EXPECTED_TWO_BYTE_ROUNDTRIPPABLE_COUNT, valid);
+  }
+
+  public void testThreeBytes() throws Exception {
+    // Travis' OOM killer doesn't like this test
+    if (System.getenv("TRAVIS") == null) {
+      int count = 0;
+      int valid = 0;
+      for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; i++) {
+        for (int j = Byte.MIN_VALUE; j <= Byte.MAX_VALUE; j++) {
+          for (int k = Byte.MIN_VALUE; k <= Byte.MAX_VALUE; k++) {
+            byte[] bytes = new byte[]{(byte) i, (byte) j, (byte) k};
+            ByteString bs = ByteString.copyFrom(bytes);
+            if (!bs.isValidUtf8()) {
+              assertInvalid(bytes);
+            } else {
+              valid++;
+            }
+            count++;
+            if (count % 1000000L == 0) {
+              logger.info("Processed " + (count / 1000000L) + " million characters");
+            }
+          }
+        }
+      }
+      assertEquals(IsValidUtf8TestUtil.EXPECTED_THREE_BYTE_ROUNDTRIPPABLE_COUNT, valid);
+    }
+  }
+
+  /**
+   * Tests that round tripping of a sample of four byte permutations work.
+   */
+  public void testInvalid_4BytesSamples() throws Exception {
+    // Bad trailing bytes
+    assertInvalid(0xF0, 0xA4, 0xAD, 0x7F);
+    assertInvalid(0xF0, 0xA4, 0xAD, 0xC0);
+
+    // Special cases for byte2
+    assertInvalid(0xF0, 0x8F, 0xAD, 0xA2);
+    assertInvalid(0xF4, 0x90, 0xAD, 0xA2);
+  }
+
+  public void testRealStrings() throws Exception {
+    // English
+    assertRoundTrips("The quick brown fox jumps over the lazy dog");
+    // German
+    assertRoundTrips("Quizdeltagerne spiste jordb\u00e6r med fl\u00f8de, mens cirkusklovnen");
+    // Japanese
+    assertRoundTrips(
+        "\u3044\u308d\u306f\u306b\u307b\u3078\u3068\u3061\u308a\u306c\u308b\u3092");
+    // Hebrew
+    assertRoundTrips(
+        "\u05d3\u05d2 \u05e1\u05e7\u05e8\u05df \u05e9\u05d8 \u05d1\u05d9\u05dd "
+            + "\u05de\u05d0\u05d5\u05db\u05d6\u05d1 \u05d5\u05dc\u05e4\u05ea\u05e2"
+            + " \u05de\u05e6\u05d0 \u05dc\u05d5 \u05d7\u05d1\u05e8\u05d4 "
+            + "\u05d0\u05d9\u05da \u05d4\u05e7\u05dc\u05d9\u05d8\u05d4");
+    // Thai
+    assertRoundTrips(
+        " \u0e08\u0e07\u0e1d\u0e48\u0e32\u0e1f\u0e31\u0e19\u0e1e\u0e31\u0e12"
+            + "\u0e19\u0e32\u0e27\u0e34\u0e0a\u0e32\u0e01\u0e32\u0e23");
+    // Chinese
+    assertRoundTrips(
+        "\u8fd4\u56de\u94fe\u4e2d\u7684\u4e0b\u4e00\u4e2a\u4ee3\u7406\u9879\u9009\u62e9\u5668");
+    // Chinese with 4-byte chars
+    assertRoundTrips("\uD841\uDF0E\uD841\uDF31\uD841\uDF79\uD843\uDC53\uD843\uDC78"
+        + "\uD843\uDC96\uD843\uDCCF\uD843\uDCD5\uD843\uDD15\uD843\uDD7C\uD843\uDD7F"
+        + "\uD843\uDE0E\uD843\uDE0F\uD843\uDE77\uD843\uDE9D\uD843\uDEA2");
+    // Mixed
+    assertRoundTrips(
+        "The quick brown \u3044\u308d\u306f\u306b\u307b\u3078\u8fd4\u56de\u94fe"
+            + "\u4e2d\u7684\u4e0b\u4e00");
+  }
+
+  public void testOverlong() throws Exception {
+    assertInvalid(0xc0, 0xaf);
+    assertInvalid(0xe0, 0x80, 0xaf);
+    assertInvalid(0xf0, 0x80, 0x80, 0xaf);
+
+    // Max overlong
+    assertInvalid(0xc1, 0xbf);
+    assertInvalid(0xe0, 0x9f, 0xbf);
+    assertInvalid(0xf0 ,0x8f, 0xbf, 0xbf);
+
+    // null overlong
+    assertInvalid(0xc0, 0x80);
+    assertInvalid(0xe0, 0x80, 0x80);
+    assertInvalid(0xf0, 0x80, 0x80, 0x80);
+  }
+
+  public void testIllegalCodepoints() throws Exception {
+    // Single surrogate
+    assertInvalid(0xed, 0xa0, 0x80);
+    assertInvalid(0xed, 0xad, 0xbf);
+    assertInvalid(0xed, 0xae, 0x80);
+    assertInvalid(0xed, 0xaf, 0xbf);
+    assertInvalid(0xed, 0xb0, 0x80);
+    assertInvalid(0xed, 0xbe, 0x80);
+    assertInvalid(0xed, 0xbf, 0xbf);
+
+    // Paired surrogates
+    assertInvalid(0xed, 0xa0, 0x80, 0xed, 0xb0, 0x80);
+    assertInvalid(0xed, 0xa0, 0x80, 0xed, 0xbf, 0xbf);
+    assertInvalid(0xed, 0xad, 0xbf, 0xed, 0xb0, 0x80);
+    assertInvalid(0xed, 0xad, 0xbf, 0xed, 0xbf, 0xbf);
+    assertInvalid(0xed, 0xae, 0x80, 0xed, 0xb0, 0x80);
+    assertInvalid(0xed, 0xae, 0x80, 0xed, 0xbf, 0xbf);
+    assertInvalid(0xed, 0xaf, 0xbf, 0xed, 0xb0, 0x80);
+    assertInvalid(0xed, 0xaf, 0xbf, 0xed, 0xbf, 0xbf);
+  }
+
+  public void testBufferSlice() throws Exception {
+    String str = "The quick brown fox jumps over the lazy dog";
+    assertRoundTrips(str, 10, 4);
+    assertRoundTrips(str, str.length(), 0);
+  }
+
+  public void testInvalidBufferSlice() throws Exception {
+    byte[] bytes  = "The quick brown fox jumps over the lazy dog".getBytes(Internal.UTF_8);
+    assertInvalidSlice(bytes, bytes.length - 3, 4);
+    assertInvalidSlice(bytes, bytes.length, 1);
+    assertInvalidSlice(bytes, bytes.length + 1, 0);
+    assertInvalidSlice(bytes, 0, bytes.length + 1);
+  }
+
+  private void assertInvalid(int... bytesAsInt) throws Exception {
+    byte[] bytes = new byte[bytesAsInt.length];
+    for (int i = 0; i < bytesAsInt.length; i++) {
+      bytes[i] = (byte) bytesAsInt[i];
+    }
+    assertInvalid(bytes);
+  }
+
+  private void assertInvalid(byte[] bytes) throws Exception {
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(bytes, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(bytes, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+
+    ByteBuffer direct = ByteBuffer.allocateDirect(bytes.length);
+    direct.put(bytes);
+    direct.flip();
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(direct, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(direct, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+
+    ByteBuffer heap = ByteBuffer.allocate(bytes.length);
+    heap.put(bytes);
+    heap.flip();
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(heap, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(heap, 0, bytes.length);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+  }
+
+  private void assertInvalidSlice(byte[] bytes, int index, int size) throws Exception {
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(bytes, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(bytes, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+
+    ByteBuffer direct = ByteBuffer.allocateDirect(bytes.length);
+    direct.put(bytes);
+    direct.flip();
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(direct, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(direct, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+
+    ByteBuffer heap = ByteBuffer.allocate(bytes.length);
+    heap.put(bytes);
+    heap.flip();
+    try {
+      UNSAFE_PROCESSOR.decodeUtf8(heap, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+    try {
+      SAFE_PROCESSOR.decodeUtf8(heap, index, size);
+      fail();
+    } catch (ArrayIndexOutOfBoundsException e) {
+      // Expected.
+    }
+  }
+
+  private void assertRoundTrips(String str) throws Exception {
+    assertRoundTrips(str, 0, -1);
+  }
+
+  private void assertRoundTrips(String str, int index, int size) throws Exception {
+    byte[] bytes = str.getBytes(Internal.UTF_8);
+    if (size == -1) {
+      size = bytes.length;
+    }
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        UNSAFE_PROCESSOR.decodeUtf8(bytes, index, size));
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        SAFE_PROCESSOR.decodeUtf8(bytes, index, size));
+
+    ByteBuffer direct = ByteBuffer.allocateDirect(bytes.length);
+    direct.put(bytes);
+    direct.flip();
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        UNSAFE_PROCESSOR.decodeUtf8(direct, index, size));
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        SAFE_PROCESSOR.decodeUtf8(direct, index, size));
+
+    ByteBuffer heap = ByteBuffer.allocate(bytes.length);
+    heap.put(bytes);
+    heap.flip();
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        UNSAFE_PROCESSOR.decodeUtf8(heap, index, size));
+    assertDecode(new String(bytes, index, size, Internal.UTF_8),
+        SAFE_PROCESSOR.decodeUtf8(heap, index, size));
+  }
+
+  private void assertDecode(String expected, String actual) {
+    if (!expected.equals(actual)) {
+      fail("Failure: Expected (" + codepoints(expected) + ") Actual (" + codepoints(actual) + ")");
+    }
+  }
+
+  private List<String> codepoints(String str) {
+    List<String> codepoints = new ArrayList<String>();
+    for (int i = 0; i < str.length(); i++) {
+      codepoints.add(Long.toHexString(str.charAt(i)));
+    }
+    return codepoints;
+  }
+
+}
diff --git a/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java b/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
index 2c272a73..9c0997c4 100644
--- a/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DeprecatedFieldTest.java
@@ -37,22 +37,22 @@ import junit.framework.TestCase;
 
 /**
  * Test field deprecation
- * 
+ *
  * @author birdo@google.com (Roberto Scaramuzzi)
  */
 public class DeprecatedFieldTest extends TestCase {
   private String[] deprecatedGetterNames = {
       "hasDeprecatedInt32",
       "getDeprecatedInt32"};
-  
+
   private String[] deprecatedBuilderGetterNames = {
       "hasDeprecatedInt32",
       "getDeprecatedInt32",
       "clearDeprecatedInt32"};
-  
+
   private String[] deprecatedBuilderSetterNames = {
-      "setDeprecatedInt32"}; 
-  
+      "setDeprecatedInt32"};
+
   public void testDeprecatedField() throws Exception {
     Class<?> deprecatedFields = TestDeprecatedFields.class;
     Class<?> deprecatedFieldsBuilder = TestDeprecatedFields.Builder.class;
@@ -72,7 +72,15 @@ public class DeprecatedFieldTest extends TestCase {
           isDeprecated(method));
     }
   }
-  
+
+  public void testDeprecatedFieldInOneof() throws Exception {
+    Class<?> oneofCase = TestDeprecatedFields.OneofFieldsCase.class;
+    String name = "DEPRECATED_INT32_IN_ONEOF";
+    java.lang.reflect.Field enumValue = oneofCase.getField(name);
+    assertTrue("Enum value " + name + " should be deprecated.",
+       isDeprecated(enumValue));
+  }
+
   private boolean isDeprecated(AnnotatedElement annotated) {
     return annotated.isAnnotationPresent(Deprecated.class);
   }
diff --git a/java/core/src/test/java/com/google/protobuf/DiscardUnknownFieldsTest.java b/java/core/src/test/java/com/google/protobuf/DiscardUnknownFieldsTest.java
new file mode 100644
index 00000000..0f09a51b
--- /dev/null
+++ b/java/core/src/test/java/com/google/protobuf/DiscardUnknownFieldsTest.java
@@ -0,0 +1,157 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import static org.junit.Assert.assertEquals;
+
+import protobuf_unittest.UnittestProto;
+import proto3_unittest.UnittestProto3;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for discard or preserve unknown fields. */
+@RunWith(JUnit4.class)
+public class DiscardUnknownFieldsTest {
+  @Test
+  public void testProto2() throws Exception {
+    testProto2Message(
+          UnittestProto.TestEmptyMessage.getDefaultInstance());
+    testProto2Message(
+          UnittestProto.TestEmptyMessageWithExtensions.getDefaultInstance());
+    testProto2Message(
+          DynamicMessage.getDefaultInstance(UnittestProto.TestEmptyMessage.getDescriptor()));
+    testProto2Message(
+          DynamicMessage.getDefaultInstance(
+              UnittestProto.TestEmptyMessageWithExtensions.getDescriptor()));
+  }
+
+  @Test
+  public void testProto3() throws Exception {
+    testProto3Message(UnittestProto3.TestEmptyMessage.getDefaultInstance());
+    testProto3Message(
+        DynamicMessage.getDefaultInstance(UnittestProto3.TestEmptyMessage.getDescriptor()));
+  }
+
+  private static void testProto2Message(Message message) throws Exception {
+    assertUnknownFieldsDefaultPreserved(message);
+    assertUnknownFieldsExplicitlyDiscarded(message);
+    assertReuseCodedInputStreamPreserve(message);
+    assertUnknownFieldsInUnknownFieldSetArePreserve(message);
+  }
+
+  private static void testProto3Message(Message message) throws Exception {
+    CodedInputStream.setProto3KeepUnknownsByDefaultForTest();
+    assertUnknownFieldsDefaultPreserved(message);
+    assertUnknownFieldsExplicitlyDiscarded(message);
+    assertReuseCodedInputStreamPreserve(message);
+    assertUnknownFieldsInUnknownFieldSetArePreserve(message);
+    CodedInputStream.setProto3DiscardUnknownsByDefaultForTest();
+    assertUnknownFieldsDefaultDiscarded(message);
+    assertUnknownFieldsExplicitlyDiscarded(message);
+    assertUnknownFieldsInUnknownFieldSetAreDiscarded(message);
+  }
+
+  private static void assertReuseCodedInputStreamPreserve(Message message) throws Exception {
+    final int messageSize = payload.size();
+    byte[] copied = new byte[messageSize * 2];
+    payload.copyTo(copied, 0);
+    payload.copyTo(copied, messageSize);
+    CodedInputStream input = CodedInputStream.newInstance(copied);
+    {
+      // Use DiscardUnknownFieldsParser to parse the first payload.
+      int oldLimit = input.pushLimit(messageSize);
+      Message parsed = DiscardUnknownFieldsParser.wrap(message.getParserForType()).parseFrom(input);
+      assertEquals(message.getClass().getName(), 0, parsed.getSerializedSize());
+      input.popLimit(oldLimit);
+    }
+    {
+      // Use the normal parser to parse the remaining payload should have unknown fields preserved.
+      Message parsed = message.getParserForType().parseFrom(input);
+      assertEquals(message.getClass().getName(), payload, parsed.toByteString());
+    }
+  }
+
+  /**
+   * {@link Message.Builder#setUnknownFields(UnknownFieldSet)} and {@link
+   * Message.Builder#mergeUnknownFields(UnknownFieldSet)} should preserve the unknown fields.
+   */
+  private static void assertUnknownFieldsInUnknownFieldSetArePreserve(Message message)
+      throws Exception {
+    UnknownFieldSet unknownFields = UnknownFieldSet.newBuilder().mergeFrom(payload).build();
+    Message built = message.newBuilderForType().setUnknownFields(unknownFields).build();
+    assertEquals(message.getClass().getName(), payload, built.toByteString());
+
+  }
+  /**
+   * {@link Message.Builder#setUnknownFields(UnknownFieldSet)} and {@link
+   * Message.Builder#mergeUnknownFields(UnknownFieldSet)} should discard the unknown fields.
+   */
+  private static void assertUnknownFieldsInUnknownFieldSetAreDiscarded(Message message)
+      throws Exception {
+    UnknownFieldSet unknownFields = UnknownFieldSet.newBuilder().mergeFrom(payload).build();
+    Message built = message.newBuilderForType().setUnknownFields(unknownFields).build();
+    assertEquals(message.getClass().getName(), 0, built.getSerializedSize());
+  }
+
+  private static void assertUnknownFieldsDefaultPreserved(MessageLite message) throws Exception {
+    {
+      MessageLite parsed = message.getParserForType().parseFrom(payload);
+      assertEquals(message.getClass().getName(), payload, parsed.toByteString());
+    }
+
+    {
+      MessageLite parsed = message.newBuilderForType().mergeFrom(payload).build();
+      assertEquals(message.getClass().getName(), payload, parsed.toByteString());
+    }
+  }
+
+  private static void assertUnknownFieldsDefaultDiscarded(MessageLite message) throws Exception {
+    {
+      MessageLite parsed = message.getParserForType().parseFrom(payload);
+      assertEquals(message.getClass().getName(), 0, parsed.getSerializedSize());
+    }
+
+    {
+      MessageLite parsed = message.newBuilderForType().mergeFrom(payload).build();
+      assertEquals(message.getClass().getName(), 0, parsed.getSerializedSize());
+    }
+  }
+
+  private static void assertUnknownFieldsExplicitlyDiscarded(Message message) throws Exception {
+    Message parsed =
+        DiscardUnknownFieldsParser.wrap(message.getParserForType()).parseFrom(payload);
+    assertEquals(message.getClass().getName(), 0, parsed.getSerializedSize());
+  }
+
+  private static final ByteString payload =
+      TestUtilLite.getAllLiteSetBuilder().build().toByteString();
+}
diff --git a/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java b/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java
index d8942792..923d7f43 100644
--- a/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/DoubleArrayListTest.java
@@ -32,6 +32,7 @@ package com.google.protobuf;
 
 import static java.util.Arrays.asList;
 
+import com.google.protobuf.Internal.DoubleList;
 import java.util.Collections;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -297,6 +298,20 @@ public class DoubleArrayListTest extends TestCase {
     }
   }
 
+  public void testRemoveEndOfCapacity() {
+    DoubleList toRemove = DoubleArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addDouble(3);
+    toRemove.remove(0);
+    assertEquals(0, toRemove.size());
+  }
+
+  public void testSublistRemoveEndOfCapacity() {
+    DoubleList toRemove = DoubleArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addDouble(3);
+    toRemove.subList(0, 1).clear();
+    assertEquals(0, toRemove.size());
+  }
+
   private void assertImmutable(DoubleArrayList list) {
     if (list.contains(1D)) {
       throw new RuntimeException("Cannot test the immutability of lists that contain 1.");
diff --git a/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java b/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java
index 4a42c897..42da5bb3 100644
--- a/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java
+++ b/java/core/src/test/java/com/google/protobuf/FieldPresenceTest.java
@@ -108,7 +108,7 @@ public class FieldPresenceTest extends TestCase {
     assertFalse(TestAllTypes.newBuilder().build().hasOptionalNestedMessage());
     assertFalse(TestAllTypes.newBuilder().hasOptionalNestedMessage());
 
-    // oneof fields don't have hasFoo() methods (even for message types).
+    // oneof fields don't have hasFoo() methods for non-message types.
     assertHasMethodRemoved(
         UnittestProto.TestAllTypes.class,
         TestAllTypes.class,
@@ -121,10 +121,8 @@ public class FieldPresenceTest extends TestCase {
         UnittestProto.TestAllTypes.class,
         TestAllTypes.class,
         "OneofBytes");
-    assertHasMethodRemoved(
-        UnittestProto.TestAllTypes.class,
-        TestAllTypes.class,
-        "OneofNestedMessage");
+    assertFalse(TestAllTypes.newBuilder().build().hasOneofNestedMessage());
+    assertFalse(TestAllTypes.newBuilder().hasOneofNestedMessage());
 
     assertHasMethodRemoved(
         UnittestProto.TestAllTypes.Builder.class,
@@ -138,10 +136,6 @@ public class FieldPresenceTest extends TestCase {
         UnittestProto.TestAllTypes.Builder.class,
         TestAllTypes.Builder.class,
         "OneofBytes");
-    assertHasMethodRemoved(
-        UnittestProto.TestAllTypes.Builder.class,
-        TestAllTypes.Builder.class,
-        "OneofNestedMessage");
   }
 
   public void testOneofEquals() throws Exception {
@@ -410,34 +404,4 @@ public class FieldPresenceTest extends TestCase {
     assertTrue(builder.buildPartial().isInitialized());
   }
 
-
-  // Test that unknown fields are dropped.
-  public void testUnknownFields() throws Exception {
-    TestAllTypes.Builder builder = TestAllTypes.newBuilder();
-    builder.setOptionalInt32(1234);
-    builder.addRepeatedInt32(5678);
-    TestAllTypes message = builder.build();
-    ByteString data = message.toByteString();
-
-    TestOptionalFieldsOnly optionalOnlyMessage =
-        TestOptionalFieldsOnly.parseFrom(data);
-    // UnknownFieldSet should be empty.
-    assertEquals(
-        0, optionalOnlyMessage.getUnknownFields().toByteString().size());
-    assertEquals(1234, optionalOnlyMessage.getOptionalInt32());
-    message = TestAllTypes.parseFrom(optionalOnlyMessage.toByteString());
-    assertEquals(1234, message.getOptionalInt32());
-    // The repeated field is discarded because it's unknown to the optional-only
-    // message.
-    assertEquals(0, message.getRepeatedInt32Count());
-
-    DynamicMessage dynamicOptionalOnlyMessage =
-        DynamicMessage.getDefaultInstance(
-            TestOptionalFieldsOnly.getDescriptor())
-        .getParserForType().parseFrom(data);
-    assertEquals(
-        0, dynamicOptionalOnlyMessage.getUnknownFields().toByteString().size());
-    assertEquals(optionalOnlyMessage.toByteString(),
-        dynamicOptionalOnlyMessage.toByteString());
-  }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java b/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java
index aa36be49..903a79db 100644
--- a/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/FloatArrayListTest.java
@@ -32,6 +32,7 @@ package com.google.protobuf;
 
 import static java.util.Arrays.asList;
 
+import com.google.protobuf.Internal.FloatList;
 import java.util.Collections;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -297,6 +298,20 @@ public class FloatArrayListTest extends TestCase {
     }
   }
 
+  public void testRemoveEndOfCapacity() {
+    FloatList toRemove = FloatArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addFloat(3);
+    toRemove.remove(0);
+    assertEquals(0, toRemove.size());
+  }
+
+  public void testSublistRemoveEndOfCapacity() {
+    FloatList toRemove = FloatArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addFloat(3);
+    toRemove.subList(0, 1).clear();
+    assertEquals(0, toRemove.size());
+  }
+
   private void assertImmutable(FloatArrayList list) {
     if (list.contains(1F)) {
       throw new RuntimeException("Cannot test the immutability of lists that contain 1.");
diff --git a/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java b/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
index 3eece26a..c9ebe7f5 100644
--- a/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/GeneratedMessageTest.java
@@ -32,19 +32,14 @@ package com.google.protobuf;
 
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
-import com.google.protobuf.UnittestLite.TestAllExtensionsLite;
 import com.google.protobuf.test.UnittestImport;
 import protobuf_unittest.EnumWithNoOuter;
 import protobuf_unittest.MessageWithNoOuter;
 import protobuf_unittest.MultipleFilesTestProto;
 import protobuf_unittest.NestedExtension.MyNestedExtension;
-import protobuf_unittest.NestedExtensionLite.MyNestedExtensionLite;
 import protobuf_unittest.NonNestedExtension;
 import protobuf_unittest.NonNestedExtension.MessageToBeExtended;
 import protobuf_unittest.NonNestedExtension.MyNonNestedExtension;
-import protobuf_unittest.NonNestedExtensionLite;
-import protobuf_unittest.NonNestedExtensionLite.MessageLiteToBeExtended;
-import protobuf_unittest.NonNestedExtensionLite.MyNonNestedExtensionLite;
 import protobuf_unittest.OuterClassNameTest2OuterClass;
 import protobuf_unittest.OuterClassNameTest3OuterClass;
 import protobuf_unittest.OuterClassNameTestOuterClass;
@@ -712,70 +707,6 @@ public class GeneratedMessageTest extends TestCase {
   }
 
   // =================================================================
-  // Lite Extensions.
-
-  // We test lite extensions directly because they have a separate
-  // implementation from full extensions.  In contrast, we do not test
-  // lite fields directly since they are implemented exactly the same as
-  // regular fields.
-
-  public void testLiteExtensionMessageOrBuilder() throws Exception {
-    TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.newBuilder();
-    TestUtilLite.setAllExtensions(builder);
-    TestUtil.assertAllExtensionsSet(builder);
-
-    TestAllExtensionsLite message = builder.build();
-    TestUtil.assertAllExtensionsSet(message);
-  }
-
-  public void testLiteExtensionRepeatedSetters() throws Exception {
-    TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.newBuilder();
-    TestUtilLite.setAllExtensions(builder);
-    TestUtilLite.modifyRepeatedExtensions(builder);
-    TestUtil.assertRepeatedExtensionsModified(builder);
-
-    TestAllExtensionsLite message = builder.build();
-    TestUtil.assertRepeatedExtensionsModified(message);
-  }
-
-  public void testLiteExtensionDefaults() throws Exception {
-    TestUtil.assertExtensionsClear(TestAllExtensionsLite.getDefaultInstance());
-    TestUtil.assertExtensionsClear(TestAllExtensionsLite.newBuilder().build());
-  }
-
-  public void testClearLiteExtension() throws Exception {
-    // clearExtension() is not actually used in TestUtil, so try it manually.
-    assertFalse(
-      TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 1)
-        .clearExtension(UnittestLite.optionalInt32ExtensionLite)
-        .hasExtension(UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(0,
-      TestAllExtensionsLite.newBuilder()
-        .addExtension(UnittestLite.repeatedInt32ExtensionLite, 1)
-        .clearExtension(UnittestLite.repeatedInt32ExtensionLite)
-        .getExtensionCount(UnittestLite.repeatedInt32ExtensionLite));
-  }
-
-  public void testLiteExtensionCopy() throws Exception {
-    TestAllExtensionsLite original = TestUtilLite.getAllLiteExtensionsSet();
-    TestAllExtensionsLite copy =
-        TestAllExtensionsLite.newBuilder(original).build();
-    TestUtil.assertAllExtensionsSet(copy);
-  }
-
-  public void testLiteExtensionMergeFrom() throws Exception {
-    TestAllExtensionsLite original =
-      TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 1).build();
-    TestAllExtensionsLite merged =
-        TestAllExtensionsLite.newBuilder().mergeFrom(original).build();
-    assertTrue(merged.hasExtension(UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(
-        1, (int) merged.getExtension(UnittestLite.optionalInt32ExtensionLite));
-  }
-
-  // =================================================================
   // multiple_files_test
 
   // Test that custom options of an file level enum are properly initialized.
@@ -923,15 +854,9 @@ public class GeneratedMessageTest extends TestCase {
   }
 
   public void testEnumValues() {
-     assertEquals(
-         TestAllTypes.NestedEnum.BAR.getNumber(),
-         TestAllTypes.NestedEnum.BAR_VALUE);
-    assertEquals(
-        TestAllTypes.NestedEnum.BAZ.getNumber(),
-        TestAllTypes.NestedEnum.BAZ_VALUE);
-    assertEquals(
-        TestAllTypes.NestedEnum.FOO.getNumber(),
-        TestAllTypes.NestedEnum.FOO_VALUE);
+    assertEquals(TestAllTypes.NestedEnum.BAR_VALUE, TestAllTypes.NestedEnum.BAR.getNumber());
+    assertEquals(TestAllTypes.NestedEnum.BAZ_VALUE, TestAllTypes.NestedEnum.BAZ.getNumber());
+    assertEquals(TestAllTypes.NestedEnum.FOO_VALUE, TestAllTypes.NestedEnum.FOO.getNumber());
   }
 
   public void testNonNestedExtensionInitialization() {
@@ -948,16 +873,6 @@ public class GeneratedMessageTest extends TestCase {
                  MyNestedExtension.recursiveExtension.getDescriptor().getName());
   }
 
-  public void testNonNestedExtensionLiteInitialization() {
-    assertTrue(NonNestedExtensionLite.nonNestedExtensionLite
-               .getMessageDefaultInstance() instanceof MyNonNestedExtensionLite);
-  }
-
-  public void testNestedExtensionLiteInitialization() {
-    assertTrue(MyNestedExtensionLite.recursiveExtensionLite
-               .getMessageDefaultInstance() instanceof MessageLiteToBeExtended);
-  }
-
   public void testInvalidations() throws Exception {
     GeneratedMessage.enableAlwaysUseFieldBuildersForTesting();
     TestAllTypes.NestedMessage nestedMessage1 =
@@ -1319,51 +1234,51 @@ public class GeneratedMessageTest extends TestCase {
       assertFalse(builder.clearFooInt().hasFooInt());
       TestOneof2 message2 = builder.build();
       assertFalse(message2.hasFooInt());
-      assertEquals(message2.getFooInt(), 0);
+      assertEquals(0, message2.getFooInt());
     }
 
     // Enum
     {
       TestOneof2.Builder builder = TestOneof2.newBuilder();
-      assertEquals(builder.getFooEnum(), TestOneof2.NestedEnum.FOO);
+      assertEquals(TestOneof2.NestedEnum.FOO, builder.getFooEnum());
       assertTrue(builder.setFooEnum(TestOneof2.NestedEnum.BAR).hasFooEnum());
-      assertEquals(builder.getFooEnum(), TestOneof2.NestedEnum.BAR);
+      assertEquals(TestOneof2.NestedEnum.BAR, builder.getFooEnum());
       TestOneof2 message = builder.buildPartial();
       assertTrue(message.hasFooEnum());
-      assertEquals(message.getFooEnum(), TestOneof2.NestedEnum.BAR);
+      assertEquals(TestOneof2.NestedEnum.BAR, message.getFooEnum());
 
       assertFalse(builder.clearFooEnum().hasFooEnum());
       TestOneof2 message2 = builder.build();
       assertFalse(message2.hasFooEnum());
-      assertEquals(message2.getFooEnum(), TestOneof2.NestedEnum.FOO);
+      assertEquals(TestOneof2.NestedEnum.FOO, message2.getFooEnum());
     }
 
     // String
     {
       TestOneof2.Builder builder = TestOneof2.newBuilder();
-      assertEquals(builder.getFooString(), "");
+      assertEquals("", builder.getFooString());
       builder.setFooString("foo");
       assertTrue(builder.hasFooString());
-      assertEquals(builder.getFooString(), "foo");
+      assertEquals("foo", builder.getFooString());
       TestOneof2 message = builder.buildPartial();
       assertTrue(message.hasFooString());
-      assertEquals(message.getFooString(), "foo");
+      assertEquals("foo", message.getFooString());
       assertEquals(message.getFooStringBytes(), TestUtil.toBytes("foo"));
 
       assertFalse(builder.clearFooString().hasFooString());
       TestOneof2 message2 = builder.buildPartial();
       assertFalse(message2.hasFooString());
-      assertEquals(message2.getFooString(), "");
+      assertEquals("", message2.getFooString());
       assertEquals(message2.getFooStringBytes(), TestUtil.toBytes(""));
 
       // Get method should not change the oneof value.
       builder.setFooInt(123);
-      assertEquals(builder.getFooString(), "");
+      assertEquals("", builder.getFooString());
       assertEquals(builder.getFooStringBytes(), TestUtil.toBytes(""));
       assertEquals(123, builder.getFooInt());
 
       message = builder.build();
-      assertEquals(message.getFooString(), "");
+      assertEquals("", message.getFooString());
       assertEquals(message.getFooStringBytes(), TestUtil.toBytes(""));
       assertEquals(123, message.getFooInt());
     }
@@ -1371,38 +1286,38 @@ public class GeneratedMessageTest extends TestCase {
     // Cord
     {
       TestOneof2.Builder builder = TestOneof2.newBuilder();
-      assertEquals(builder.getFooCord(), "");
+      assertEquals("", builder.getFooCord());
       builder.setFooCord("foo");
       assertTrue(builder.hasFooCord());
-      assertEquals(builder.getFooCord(), "foo");
+      assertEquals("foo", builder.getFooCord());
       TestOneof2 message = builder.buildPartial();
       assertTrue(message.hasFooCord());
-      assertEquals(message.getFooCord(), "foo");
+      assertEquals("foo", message.getFooCord());
       assertEquals(message.getFooCordBytes(), TestUtil.toBytes("foo"));
 
       assertFalse(builder.clearFooCord().hasFooCord());
       TestOneof2 message2 = builder.build();
       assertFalse(message2.hasFooCord());
-      assertEquals(message2.getFooCord(), "");
+      assertEquals("", message2.getFooCord());
       assertEquals(message2.getFooCordBytes(), TestUtil.toBytes(""));
     }
 
     // StringPiece
     {
       TestOneof2.Builder builder = TestOneof2.newBuilder();
-      assertEquals(builder.getFooStringPiece(), "");
+      assertEquals("", builder.getFooStringPiece());
       builder.setFooStringPiece("foo");
       assertTrue(builder.hasFooStringPiece());
-      assertEquals(builder.getFooStringPiece(), "foo");
+      assertEquals("foo", builder.getFooStringPiece());
       TestOneof2 message = builder.buildPartial();
       assertTrue(message.hasFooStringPiece());
-      assertEquals(message.getFooStringPiece(), "foo");
+      assertEquals("foo", message.getFooStringPiece());
       assertEquals(message.getFooStringPieceBytes(), TestUtil.toBytes("foo"));
 
       assertFalse(builder.clearFooStringPiece().hasFooStringPiece());
       TestOneof2 message2 = builder.build();
       assertFalse(message2.hasFooStringPiece());
-      assertEquals(message2.getFooStringPiece(), "");
+      assertEquals("", message2.getFooStringPiece());
       assertEquals(message2.getFooStringPieceBytes(), TestUtil.toBytes(""));
     }
 
@@ -1410,20 +1325,20 @@ public class GeneratedMessageTest extends TestCase {
     {
       // set
       TestOneof2.Builder builder = TestOneof2.newBuilder();
-      assertEquals(builder.getFooMessage().getQuxInt(), 0);
+      assertEquals(0, builder.getFooMessage().getQuxInt());
       builder.setFooMessage(
           TestOneof2.NestedMessage.newBuilder().setQuxInt(234).build());
       assertTrue(builder.hasFooMessage());
-      assertEquals(builder.getFooMessage().getQuxInt(), 234);
+      assertEquals(234, builder.getFooMessage().getQuxInt());
       TestOneof2 message = builder.buildPartial();
       assertTrue(message.hasFooMessage());
-      assertEquals(message.getFooMessage().getQuxInt(), 234);
+      assertEquals(234, message.getFooMessage().getQuxInt());
 
       // clear
       assertFalse(builder.clearFooMessage().hasFooString());
       message = builder.build();
       assertFalse(message.hasFooMessage());
-      assertEquals(message.getFooMessage().getQuxInt(), 0);
+      assertEquals(0, message.getFooMessage().getQuxInt());
 
       // nested builder
       builder = TestOneof2.newBuilder();
@@ -1432,10 +1347,10 @@ public class GeneratedMessageTest extends TestCase {
       assertFalse(builder.hasFooMessage());
       builder.getFooMessageBuilder().setQuxInt(123);
       assertTrue(builder.hasFooMessage());
-      assertEquals(builder.getFooMessage().getQuxInt(), 123);
+      assertEquals(123, builder.getFooMessage().getQuxInt());
       message = builder.build();
       assertTrue(message.hasFooMessage());
-      assertEquals(message.getFooMessage().getQuxInt(), 123);
+      assertEquals(123, message.getFooMessage().getQuxInt());
     }
 
     // LazyMessage is tested in LazyMessageLiteTest.java
@@ -1448,7 +1363,7 @@ public class GeneratedMessageTest extends TestCase {
       TestOneof2 message = builder.setFooInt(123).build();
       TestOneof2 message2 = TestOneof2.newBuilder().mergeFrom(message).build();
       assertTrue(message2.hasFooInt());
-      assertEquals(message2.getFooInt(), 123);
+      assertEquals(123, message2.getFooInt());
     }
 
     // String
@@ -1457,7 +1372,7 @@ public class GeneratedMessageTest extends TestCase {
       TestOneof2 message = builder.setFooString("foo").build();
       TestOneof2 message2 = TestOneof2.newBuilder().mergeFrom(message).build();
       assertTrue(message2.hasFooString());
-      assertEquals(message2.getFooString(), "foo");
+      assertEquals("foo", message2.getFooString());
     }
 
     // Enum
@@ -1466,7 +1381,7 @@ public class GeneratedMessageTest extends TestCase {
       TestOneof2 message = builder.setFooEnum(TestOneof2.NestedEnum.BAR).build();
       TestOneof2 message2 = TestOneof2.newBuilder().mergeFrom(message).build();
       assertTrue(message2.hasFooEnum());
-      assertEquals(message2.getFooEnum(), TestOneof2.NestedEnum.BAR);
+      assertEquals(TestOneof2.NestedEnum.BAR, message2.getFooEnum());
     }
 
     // Message
@@ -1476,7 +1391,7 @@ public class GeneratedMessageTest extends TestCase {
           TestOneof2.NestedMessage.newBuilder().setQuxInt(234).build()).build();
       TestOneof2 message2 = TestOneof2.newBuilder().mergeFrom(message).build();
       assertTrue(message2.hasFooMessage());
-      assertEquals(message2.getFooMessage().getQuxInt(), 234);
+      assertEquals(234, message2.getFooMessage().getQuxInt());
     }
   }
 
@@ -1488,7 +1403,7 @@ public class GeneratedMessageTest extends TestCase {
       ByteString serialized = message.toByteString();
       TestOneof2 message2 = TestOneof2.parseFrom(serialized);
       assertTrue(message2.hasFooInt());
-      assertEquals(message2.getFooInt(), 123);
+      assertEquals(123, message2.getFooInt());
     }
 
     // String
@@ -1498,7 +1413,7 @@ public class GeneratedMessageTest extends TestCase {
       ByteString serialized = message.toByteString();
       TestOneof2 message2 = TestOneof2.parseFrom(serialized);
       assertTrue(message2.hasFooString());
-      assertEquals(message2.getFooString(), "foo");
+      assertEquals("foo", message2.getFooString());
     }
 
     // Enum
@@ -1508,7 +1423,7 @@ public class GeneratedMessageTest extends TestCase {
       ByteString serialized = message.toByteString();
       TestOneof2 message2 = TestOneof2.parseFrom(serialized);
       assertTrue(message2.hasFooEnum());
-      assertEquals(message2.getFooEnum(), TestOneof2.NestedEnum.BAR);
+      assertEquals(TestOneof2.NestedEnum.BAR, message2.getFooEnum());
     }
 
     // Message
@@ -1519,7 +1434,7 @@ public class GeneratedMessageTest extends TestCase {
       ByteString serialized = message.toByteString();
       TestOneof2 message2 = TestOneof2.parseFrom(serialized);
       assertTrue(message2.hasFooMessage());
-      assertEquals(message2.getFooMessage().getQuxInt(), 234);
+      assertEquals(234, message2.getFooMessage().getQuxInt());
     }
   }
 
diff --git a/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java b/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java
index 60c85450..d8e97d4f 100644
--- a/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/IntArrayListTest.java
@@ -32,6 +32,7 @@ package com.google.protobuf;
 
 import static java.util.Arrays.asList;
 
+import com.google.protobuf.Internal.IntList;
 import java.util.Collections;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -297,6 +298,20 @@ public class IntArrayListTest extends TestCase {
     }
   }
 
+  public void testRemoveEndOfCapacity() {
+    IntList toRemove = IntArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addInt(3);
+    toRemove.remove(0);
+    assertEquals(0, toRemove.size());
+  }
+
+  public void testSublistRemoveEndOfCapacity() {
+    IntList toRemove = IntArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addInt(3);
+    toRemove.subList(0, 1).clear();
+    assertEquals(0, toRemove.size());
+  }
+
   private void assertImmutable(IntArrayList list) {
     if (list.contains(1)) {
       throw new RuntimeException("Cannot test the immutability of lists that contain 1.");
diff --git a/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java b/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
index 16a808bf..1bcf63e7 100644
--- a/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
+++ b/java/core/src/test/java/com/google/protobuf/IsValidUtf8TestUtil.java
@@ -273,6 +273,15 @@ final class IsValidUtf8TestUtil {
       assertEquals(isRoundTrippable, Utf8.isValidUtf8(bytes));
       assertEquals(isRoundTrippable, Utf8.isValidUtf8(bytes, 0, numBytes));
 
+      try {
+        assertEquals(s, Utf8.decodeUtf8(bytes, 0, numBytes));
+      } catch (InvalidProtocolBufferException e) {
+        if (isRoundTrippable) {
+          System.out.println("Could not decode utf-8");
+          outputFailure(byteChar, bytes, bytesReencoded);
+        }
+      }
+
       // Test partial sequences.
       // Partition numBytes into three segments (not necessarily non-empty).
       int i = rnd.nextInt(numBytes);
diff --git a/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java b/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java
index 5f013f3c..f27e8e51 100644
--- a/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyFieldTest.java
@@ -32,7 +32,6 @@ package com.google.protobuf;
 
 import protobuf_unittest.UnittestProto.TestAllExtensions;
 import protobuf_unittest.UnittestProto.TestAllTypes;
-import java.io.IOException;
 import junit.framework.TestCase;
 
 /**
@@ -89,6 +88,7 @@ public class LazyFieldTest extends TestCase {
     assertFalse(message.equals(lazyField.getValue()));
   }
 
+  @SuppressWarnings("EqualsIncompatibleType") // LazyField.equals() is not symmetric
   public void testEqualsObjectEx() throws Exception {
     TestAllExtensions message = TestUtil.getAllExtensionsSet();
     LazyField lazyField = createLazyFieldFromMessage(message);
diff --git a/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java b/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
index d2bee2a4..2fc3124d 100644
--- a/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LazyStringArrayListTest.java
@@ -281,6 +281,7 @@ public class LazyStringArrayListTest extends TestCase {
     assertGenericListImmutable(byteArrayList, byteArrayList.get(0));
   }
   
+  @SuppressWarnings("unchecked")
   private static <T> void assertGenericListImmutable(List<T> list, T value) {
     try {
       list.add(value);
diff --git a/java/core/src/test/java/com/google/protobuf/LiteTest.java b/java/core/src/test/java/com/google/protobuf/LiteTest.java
index 538432f7..5ab80ca2 100644
--- a/java/core/src/test/java/com/google/protobuf/LiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LiteTest.java
@@ -33,6 +33,7 @@ package com.google.protobuf;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 
+import com.google.protobuf.FieldPresenceTestProto.TestAllTypes;
 import com.google.protobuf.UnittestImportLite.ImportEnumLite;
 import com.google.protobuf.UnittestImportPublicLite.PublicImportMessageLite;
 import com.google.protobuf.UnittestLite.ForeignEnumLite;
@@ -47,11 +48,21 @@ import com.google.protobuf.UnittestLite.TestAllTypesLite.RepeatedGroup;
 import com.google.protobuf.UnittestLite.TestAllTypesLiteOrBuilder;
 import com.google.protobuf.UnittestLite.TestHugeFieldNumbersLite;
 import com.google.protobuf.UnittestLite.TestNestedExtensionLite;
+import map_lite_test.MapTestProto.TestMap;
+import map_lite_test.MapTestProto.TestMap.MessageValue;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Bar;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.BarPrime;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Foo;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.TestOneofEquals;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.TestRecursiveOneof;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.lang.reflect.Field;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
 import junit.framework.TestCase;
 
 /**
@@ -81,12 +92,11 @@ public class LiteTest extends TestCase {
     // stuff to make sure the lite message is actually here and usable.
 
     TestAllTypesLite message =
-      TestAllTypesLite.newBuilder()
-                      .setOptionalInt32(123)
-                      .addRepeatedString("hello")
-                      .setOptionalNestedMessage(
-                          TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
-                      .build();
+        TestAllTypesLite.newBuilder()
+            .setOptionalInt32(123)
+            .addRepeatedString("hello")
+            .setOptionalNestedMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
+            .build();
 
     ByteString data = message.toByteString();
 
@@ -98,63 +108,97 @@ public class LiteTest extends TestCase {
     assertEquals(7, message2.getOptionalNestedMessage().getBb());
   }
 
+  public void testLite_unknownEnumAtListBoundary() throws Exception {
+    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
+    CodedOutputStream output = CodedOutputStream.newInstance(byteStream);
+    for (int i = 0; i < AbstractProtobufList.DEFAULT_CAPACITY; i++) {
+      output.writeInt32(TestAllTypesLite.REPEATED_NESTED_ENUM_FIELD_NUMBER, 1);
+    }
+    // 0 is not a valid enum value for NestedEnum
+    output.writeInt32(TestAllTypesLite.REPEATED_NESTED_ENUM_FIELD_NUMBER, 0);
+    output.flush();
+    // This tests a bug we had once with removal right at the boundary of the array. It would throw
+    // at runtime so no need to assert.
+    TestAllTypesLite.parseFrom(new ByteArrayInputStream(byteStream.toByteArray()));
+  }
+
   public void testLiteExtensions() throws Exception {
     // TODO(kenton):  Unlike other features of the lite library, extensions are
     //   implemented completely differently from the regular library.  We
     //   should probably test them more thoroughly.
 
     TestAllExtensionsLite message =
-      TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
-        .addExtension(UnittestLite.repeatedStringExtensionLite, "hello")
-        .setExtension(UnittestLite.optionalNestedEnumExtensionLite,
-            TestAllTypesLite.NestedEnum.BAZ)
-        .setExtension(UnittestLite.optionalNestedMessageExtensionLite,
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
-        .build();
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "hello")
+            .setExtension(
+                UnittestLite.optionalNestedEnumExtensionLite, TestAllTypesLite.NestedEnum.BAZ)
+            .setExtension(
+                UnittestLite.optionalNestedMessageExtensionLite,
+                TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
+            .build();
 
     // Test copying a message, since coping extensions actually does use a
     // different code path between lite and regular libraries, and as of this
     // writing, parsing hasn't been implemented yet.
     TestAllExtensionsLite message2 = message.toBuilder().build();
 
-    assertEquals(123, (int) message2.getExtension(
-        UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(1, message2.getExtensionCount(
-        UnittestLite.repeatedStringExtensionLite));
-    assertEquals(1, message2.getExtension(
-        UnittestLite.repeatedStringExtensionLite).size());
-    assertEquals("hello", message2.getExtension(
-        UnittestLite.repeatedStringExtensionLite, 0));
-    assertEquals(TestAllTypesLite.NestedEnum.BAZ, message2.getExtension(
-        UnittestLite.optionalNestedEnumExtensionLite));
-    assertEquals(7, message2.getExtension(
-        UnittestLite.optionalNestedMessageExtensionLite).getBb());
+    assertEquals(123, (int) message2.getExtension(UnittestLite.optionalInt32ExtensionLite));
+    assertEquals(1, message2.getExtensionCount(UnittestLite.repeatedStringExtensionLite));
+    assertEquals(1, message2.getExtension(UnittestLite.repeatedStringExtensionLite).size());
+    assertEquals("hello", message2.getExtension(UnittestLite.repeatedStringExtensionLite, 0));
+    assertEquals(
+        TestAllTypesLite.NestedEnum.BAZ,
+        message2.getExtension(UnittestLite.optionalNestedEnumExtensionLite));
+    assertEquals(7, message2.getExtension(UnittestLite.optionalNestedMessageExtensionLite).getBb());
   }
-  
+
   public void testClone() {
-    TestAllTypesLite.Builder expected = TestAllTypesLite.newBuilder()
-        .setOptionalInt32(123);
-    assertEquals(
-        expected.getOptionalInt32(), expected.clone().getOptionalInt32());
-   
-    TestAllExtensionsLite.Builder expected2 = TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 123);
+    TestAllTypesLite.Builder expected = TestAllTypesLite.newBuilder().setOptionalInt32(123);
+    assertEquals(expected.getOptionalInt32(), expected.clone().getOptionalInt32());
+
+    TestAllExtensionsLite.Builder expected2 =
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123);
     assertEquals(
         expected2.getExtension(UnittestLite.optionalInt32ExtensionLite),
         expected2.clone().getExtension(UnittestLite.optionalInt32ExtensionLite));
   }
-  
+
   public void testAddAll() {
     try {
-      TestAllTypesLite.newBuilder()
-          .addAllRepeatedBytes(null);
+      TestAllTypesLite.newBuilder().addAllRepeatedBytes(null);
       fail();
     } catch (NullPointerException e) {
       // expected.
     }
   }
-  
+
+  public void testMemoization() throws Exception {
+    TestAllExtensionsLite message = TestUtilLite.getAllLiteExtensionsSet();
+
+    // Test serialized size is memoized
+    message.memoizedSerializedSize = -1;
+    int size = message.getSerializedSize();
+    assertTrue(size > 0);
+    assertEquals(size, message.memoizedSerializedSize);
+
+    // Test hashCode is memoized
+    assertEquals(0, message.memoizedHashCode);
+    int hashCode = message.hashCode();
+    assertTrue(hashCode != 0);
+    assertEquals(hashCode, message.memoizedHashCode);
+
+    // Test isInitialized is memoized
+    Field memo = message.getClass().getDeclaredField("memoizedIsInitialized");
+    memo.setAccessible(true);
+    memo.set(message, (byte) -1);
+    boolean initialized = message.isInitialized();
+    assertTrue(initialized);
+    // We have to cast to Byte first. Casting to byte causes a type error
+    assertEquals(1, ((Byte) memo.get(message)).intValue());
+  }
+
   public void testSanityCopyOnWrite() throws InvalidProtocolBufferException {
     // Since builders are implemented as a thin wrapper around a message
     // instance, we attempt to verify that we can't cause the builder to modify
@@ -178,13 +222,11 @@ public class LiteTest extends TestCase {
     assertEquals(ByteString.EMPTY, message.getOptionalBytes());
     assertEquals(ByteString.copyFromUtf8("hi"), builder.getOptionalBytes());
     messageAfterBuild = builder.build();
-    assertEquals(
-        ByteString.copyFromUtf8("hi"), messageAfterBuild.getOptionalBytes());
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getOptionalBytes());
     assertEquals(ByteString.EMPTY, message.getOptionalBytes());
     builder.clearOptionalBytes();
     assertEquals(ByteString.EMPTY, builder.getOptionalBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("hi"), messageAfterBuild.getOptionalBytes());
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getOptionalBytes());
 
     message = builder.build();
     builder.setOptionalCord("hi");
@@ -202,27 +244,23 @@ public class LiteTest extends TestCase {
     assertEquals(ByteString.EMPTY, message.getOptionalCordBytes());
     assertEquals(ByteString.copyFromUtf8("no"), builder.getOptionalCordBytes());
     messageAfterBuild = builder.build();
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalCordBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalCordBytes());
     assertEquals(ByteString.EMPTY, message.getOptionalCordBytes());
     builder.clearOptionalCord();
     assertEquals(ByteString.EMPTY, builder.getOptionalCordBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalCordBytes());
-    
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalCordBytes());
+
     message = builder.build();
     builder.setOptionalDouble(1);
-    assertEquals(0D, message.getOptionalDouble());
-    assertEquals(1D, builder.getOptionalDouble());
+    assertEquals(0D, message.getOptionalDouble(), 0.0);
+    assertEquals(1D, builder.getOptionalDouble(), 0.0);
     messageAfterBuild = builder.build();
-    assertEquals(1D, messageAfterBuild.getOptionalDouble());
-    assertEquals(0D, message.getOptionalDouble());
+    assertEquals(1D, messageAfterBuild.getOptionalDouble(), 0.0);
+    assertEquals(0D, message.getOptionalDouble(), 0.0);
     builder.clearOptionalDouble();
-    assertEquals(0D, builder.getOptionalDouble());
-    assertEquals(1D, messageAfterBuild.getOptionalDouble());
-    
+    assertEquals(0D, builder.getOptionalDouble(), 0.0);
+    assertEquals(1D, messageAfterBuild.getOptionalDouble(), 0.0);
+
     message = builder.build();
     builder.setOptionalFixed32(1);
     assertEquals(0, message.getOptionalFixed32());
@@ -233,7 +271,7 @@ public class LiteTest extends TestCase {
     builder.clearOptionalFixed32();
     assertEquals(0, builder.getOptionalFixed32());
     assertEquals(1, messageAfterBuild.getOptionalFixed32());
-    
+
     message = builder.build();
     builder.setOptionalFixed64(1);
     assertEquals(0L, message.getOptionalFixed64());
@@ -247,105 +285,72 @@ public class LiteTest extends TestCase {
 
     message = builder.build();
     builder.setOptionalFloat(1);
-    assertEquals(0F, message.getOptionalFloat());
-    assertEquals(1F, builder.getOptionalFloat());
+    assertEquals(0F, message.getOptionalFloat(), 0.0f);
+    assertEquals(1F, builder.getOptionalFloat(), 0.0f);
     messageAfterBuild = builder.build();
-    assertEquals(1F, messageAfterBuild.getOptionalFloat());
-    assertEquals(0F, message.getOptionalFloat());
+    assertEquals(1F, messageAfterBuild.getOptionalFloat(), 0.0f);
+    assertEquals(0F, message.getOptionalFloat(), 0.0f);
     builder.clearOptionalFloat();
-    assertEquals(0F, builder.getOptionalFloat());
-    assertEquals(1F, messageAfterBuild.getOptionalFloat());
+    assertEquals(0F, builder.getOptionalFloat(), 0.0f);
+    assertEquals(1F, messageAfterBuild.getOptionalFloat(), 0.0f);
 
     message = builder.build();
     builder.setOptionalForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR);
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_FOO, message.getOptionalForeignEnum());
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_BAR, builder.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_FOO, message.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_BAR, builder.getOptionalForeignEnum());
     messageAfterBuild = builder.build();
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_BAR,
-        messageAfterBuild.getOptionalForeignEnum());
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_FOO, message.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_BAR, messageAfterBuild.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_FOO, message.getOptionalForeignEnum());
     builder.clearOptionalForeignEnum();
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_FOO, builder.getOptionalForeignEnum());
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_BAR,
-        messageAfterBuild.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_FOO, builder.getOptionalForeignEnum());
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_BAR, messageAfterBuild.getOptionalForeignEnum());
 
     message = builder.build();
-    ForeignMessageLite foreignMessage = ForeignMessageLite.newBuilder()
-        .setC(1)
-        .build();
+    ForeignMessageLite foreignMessage = ForeignMessageLite.newBuilder().setC(1).build();
     builder.setOptionalForeignMessage(foreignMessage);
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        message.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), message.getOptionalForeignMessage());
     assertEquals(foreignMessage, builder.getOptionalForeignMessage());
     messageAfterBuild = builder.build();
     assertEquals(foreignMessage, messageAfterBuild.getOptionalForeignMessage());
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        message.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), message.getOptionalForeignMessage());
     builder.clearOptionalForeignMessage();
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        builder.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), builder.getOptionalForeignMessage());
     assertEquals(foreignMessage, messageAfterBuild.getOptionalForeignMessage());
 
     message = builder.build();
-    ForeignMessageLite.Builder foreignMessageBuilder =
-        ForeignMessageLite.newBuilder()
-            .setC(3);
+    ForeignMessageLite.Builder foreignMessageBuilder = ForeignMessageLite.newBuilder().setC(3);
     builder.setOptionalForeignMessage(foreignMessageBuilder);
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        message.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), message.getOptionalForeignMessage());
     assertEquals(foreignMessageBuilder.build(), builder.getOptionalForeignMessage());
     messageAfterBuild = builder.build();
     assertEquals(foreignMessageBuilder.build(), messageAfterBuild.getOptionalForeignMessage());
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        message.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), message.getOptionalForeignMessage());
     builder.clearOptionalForeignMessage();
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        builder.getOptionalForeignMessage());
+    assertEquals(ForeignMessageLite.getDefaultInstance(), builder.getOptionalForeignMessage());
     assertEquals(foreignMessageBuilder.build(), messageAfterBuild.getOptionalForeignMessage());
 
     message = builder.build();
-    OptionalGroup optionalGroup = OptionalGroup.newBuilder()
-        .setA(1)
-        .build();
+    OptionalGroup optionalGroup = OptionalGroup.newBuilder().setA(1).build();
     builder.setOptionalGroup(optionalGroup);
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
     assertEquals(optionalGroup, builder.getOptionalGroup());
     messageAfterBuild = builder.build();
     assertEquals(optionalGroup, messageAfterBuild.getOptionalGroup());
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
     builder.clearOptionalGroup();
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), builder.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), builder.getOptionalGroup());
     assertEquals(optionalGroup, messageAfterBuild.getOptionalGroup());
 
     message = builder.build();
-    OptionalGroup.Builder optionalGroupBuilder = OptionalGroup.newBuilder()
-        .setA(3);
+    OptionalGroup.Builder optionalGroupBuilder = OptionalGroup.newBuilder().setA(3);
     builder.setOptionalGroup(optionalGroupBuilder);
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
     assertEquals(optionalGroupBuilder.build(), builder.getOptionalGroup());
     messageAfterBuild = builder.build();
     assertEquals(optionalGroupBuilder.build(), messageAfterBuild.getOptionalGroup());
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), message.getOptionalGroup());
     builder.clearOptionalGroup();
-    assertEquals(
-        OptionalGroup.getDefaultInstance(), builder.getOptionalGroup());
+    assertEquals(OptionalGroup.getDefaultInstance(), builder.getOptionalGroup());
     assertEquals(optionalGroupBuilder.build(), messageAfterBuild.getOptionalGroup());
 
     message = builder.build();
@@ -369,43 +374,29 @@ public class LiteTest extends TestCase {
     builder.clearOptionalInt64();
     assertEquals(0L, builder.getOptionalInt64());
     assertEquals(1L, messageAfterBuild.getOptionalInt64());
-    
+
     message = builder.build();
-    NestedMessage nestedMessage = NestedMessage.newBuilder()
-        .setBb(1)
-        .build();
+    NestedMessage nestedMessage = NestedMessage.newBuilder().setBb(1).build();
     builder.setOptionalLazyMessage(nestedMessage);
-    assertEquals(
-        NestedMessage.getDefaultInstance(),
-        message.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), message.getOptionalLazyMessage());
     assertEquals(nestedMessage, builder.getOptionalLazyMessage());
     messageAfterBuild = builder.build();
     assertEquals(nestedMessage, messageAfterBuild.getOptionalLazyMessage());
-    assertEquals(
-        NestedMessage.getDefaultInstance(),
-        message.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), message.getOptionalLazyMessage());
     builder.clearOptionalLazyMessage();
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getOptionalLazyMessage());
     assertEquals(nestedMessage, messageAfterBuild.getOptionalLazyMessage());
 
     message = builder.build();
-    NestedMessage.Builder nestedMessageBuilder =
-        NestedMessage.newBuilder()
-            .setBb(3);
+    NestedMessage.Builder nestedMessageBuilder = NestedMessage.newBuilder().setBb(3);
     builder.setOptionalLazyMessage(nestedMessageBuilder);
-    assertEquals(
-        NestedMessage.getDefaultInstance(),
-        message.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), message.getOptionalLazyMessage());
     assertEquals(nestedMessageBuilder.build(), builder.getOptionalLazyMessage());
     messageAfterBuild = builder.build();
     assertEquals(nestedMessageBuilder.build(), messageAfterBuild.getOptionalLazyMessage());
-    assertEquals(
-        NestedMessage.getDefaultInstance(),
-        message.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), message.getOptionalLazyMessage());
     builder.clearOptionalLazyMessage();
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getOptionalLazyMessage());
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getOptionalLazyMessage());
     assertEquals(nestedMessageBuilder.build(), messageAfterBuild.getOptionalLazyMessage());
 
     message = builder.build();
@@ -465,19 +456,14 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.setOptionalStringBytes(ByteString.copyFromUtf8("no"));
     assertEquals(ByteString.EMPTY, message.getOptionalStringBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("no"), builder.getOptionalStringBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), builder.getOptionalStringBytes());
     messageAfterBuild = builder.build();
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalStringBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalStringBytes());
     assertEquals(ByteString.EMPTY, message.getOptionalStringBytes());
     builder.clearOptionalString();
     assertEquals(ByteString.EMPTY, builder.getOptionalStringBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalStringBytes());
-    
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalStringBytes());
+
     message = builder.build();
     builder.setOptionalStringPiece("hi");
     assertEquals("", message.getOptionalStringPiece());
@@ -492,18 +478,13 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.setOptionalStringPieceBytes(ByteString.copyFromUtf8("no"));
     assertEquals(ByteString.EMPTY, message.getOptionalStringPieceBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("no"), builder.getOptionalStringPieceBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), builder.getOptionalStringPieceBytes());
     messageAfterBuild = builder.build();
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalStringPieceBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalStringPieceBytes());
     assertEquals(ByteString.EMPTY, message.getOptionalStringPieceBytes());
     builder.clearOptionalStringPiece();
     assertEquals(ByteString.EMPTY, builder.getOptionalStringPieceBytes());
-    assertEquals(
-        ByteString.copyFromUtf8("no"),
-        messageAfterBuild.getOptionalStringPieceBytes());
+    assertEquals(ByteString.copyFromUtf8("no"), messageAfterBuild.getOptionalStringPieceBytes());
 
     message = builder.build();
     builder.setOptionalUint32(1);
@@ -540,16 +521,13 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addAllRepeatedBytes(singletonList(ByteString.copyFromUtf8("hi")));
     assertEquals(emptyList(), message.getRepeatedBytesList());
-    assertEquals(
-        singletonList(ByteString.copyFromUtf8("hi")),
-        builder.getRepeatedBytesList());
+    assertEquals(singletonList(ByteString.copyFromUtf8("hi")), builder.getRepeatedBytesList());
     assertEquals(emptyList(), message.getRepeatedBytesList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedBytes();
     assertEquals(emptyList(), builder.getRepeatedBytesList());
     assertEquals(
-        singletonList(ByteString.copyFromUtf8("hi")),
-        messageAfterBuild.getRepeatedBytesList());
+        singletonList(ByteString.copyFromUtf8("hi")), messageAfterBuild.getRepeatedBytesList());
 
     message = builder.build();
     builder.addAllRepeatedCord(singletonList("hi"));
@@ -602,12 +580,10 @@ public class LiteTest extends TestCase {
     assertEquals(singletonList(1F), messageAfterBuild.getRepeatedFloatList());
 
     message = builder.build();
-    builder.addAllRepeatedForeignEnum(
-        singletonList(ForeignEnumLite.FOREIGN_LITE_BAR));
+    builder.addAllRepeatedForeignEnum(singletonList(ForeignEnumLite.FOREIGN_LITE_BAR));
     assertEquals(emptyList(), message.getRepeatedForeignEnumList());
     assertEquals(
-        singletonList(ForeignEnumLite.FOREIGN_LITE_BAR),
-        builder.getRepeatedForeignEnumList());
+        singletonList(ForeignEnumLite.FOREIGN_LITE_BAR), builder.getRepeatedForeignEnumList());
     assertEquals(emptyList(), message.getRepeatedForeignEnumList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedForeignEnum();
@@ -619,23 +595,17 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addAllRepeatedForeignMessage(singletonList(foreignMessage));
     assertEquals(emptyList(), message.getRepeatedForeignMessageList());
-    assertEquals(
-        singletonList(foreignMessage), builder.getRepeatedForeignMessageList());
+    assertEquals(singletonList(foreignMessage), builder.getRepeatedForeignMessageList());
     assertEquals(emptyList(), message.getRepeatedForeignMessageList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedForeignMessage();
     assertEquals(emptyList(), builder.getRepeatedForeignMessageList());
-    assertEquals(
-        singletonList(foreignMessage),
-        messageAfterBuild.getRepeatedForeignMessageList());
+    assertEquals(singletonList(foreignMessage), messageAfterBuild.getRepeatedForeignMessageList());
 
     message = builder.build();
-    builder.addAllRepeatedGroup(
-        singletonList(RepeatedGroup.getDefaultInstance()));
+    builder.addAllRepeatedGroup(singletonList(RepeatedGroup.getDefaultInstance()));
     assertEquals(emptyList(), message.getRepeatedGroupList());
-    assertEquals(
-        singletonList(RepeatedGroup.getDefaultInstance()),
-        builder.getRepeatedGroupList());
+    assertEquals(singletonList(RepeatedGroup.getDefaultInstance()), builder.getRepeatedGroupList());
     assertEquals(emptyList(), message.getRepeatedGroupList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedGroup();
@@ -667,15 +637,12 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addAllRepeatedLazyMessage(singletonList(nestedMessage));
     assertEquals(emptyList(), message.getRepeatedLazyMessageList());
-    assertEquals(
-        singletonList(nestedMessage), builder.getRepeatedLazyMessageList());
+    assertEquals(singletonList(nestedMessage), builder.getRepeatedLazyMessageList());
     assertEquals(emptyList(), message.getRepeatedLazyMessageList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedLazyMessage();
     assertEquals(emptyList(), builder.getRepeatedLazyMessageList());
-    assertEquals(
-        singletonList(nestedMessage),
-        messageAfterBuild.getRepeatedLazyMessageList());
+    assertEquals(singletonList(nestedMessage), messageAfterBuild.getRepeatedLazyMessageList());
 
     message = builder.build();
     builder.addAllRepeatedSfixed32(singletonList(1));
@@ -695,8 +662,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedSfixed64();
     assertEquals(emptyList(), builder.getRepeatedSfixed64List());
-    assertEquals(
-        singletonList(1L), messageAfterBuild.getRepeatedSfixed64List());
+    assertEquals(singletonList(1L), messageAfterBuild.getRepeatedSfixed64List());
 
     message = builder.build();
     builder.addAllRepeatedSint32(singletonList(1));
@@ -726,8 +692,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedString();
     assertEquals(emptyList(), builder.getRepeatedStringList());
-    assertEquals(
-        singletonList("hi"), messageAfterBuild.getRepeatedStringList());
+    assertEquals(singletonList("hi"), messageAfterBuild.getRepeatedStringList());
 
     message = builder.build();
     builder.addAllRepeatedStringPiece(singletonList("hi"));
@@ -737,8 +702,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedStringPiece();
     assertEquals(emptyList(), builder.getRepeatedStringPieceList());
-    assertEquals(
-        singletonList("hi"), messageAfterBuild.getRepeatedStringPieceList());
+    assertEquals(singletonList("hi"), messageAfterBuild.getRepeatedStringPieceList());
 
     message = builder.build();
     builder.addAllRepeatedUint32(singletonList(1));
@@ -773,16 +737,13 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addRepeatedBytes(ByteString.copyFromUtf8("hi"));
     assertEquals(emptyList(), message.getRepeatedBytesList());
-    assertEquals(
-        singletonList(ByteString.copyFromUtf8("hi")),
-        builder.getRepeatedBytesList());
+    assertEquals(singletonList(ByteString.copyFromUtf8("hi")), builder.getRepeatedBytesList());
     assertEquals(emptyList(), message.getRepeatedBytesList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedBytes();
     assertEquals(emptyList(), builder.getRepeatedBytesList());
     assertEquals(
-        singletonList(ByteString.copyFromUtf8("hi")),
-        messageAfterBuild.getRepeatedBytesList());
+        singletonList(ByteString.copyFromUtf8("hi")), messageAfterBuild.getRepeatedBytesList());
 
     message = builder.build();
     builder.addRepeatedCord("hi");
@@ -838,8 +799,7 @@ public class LiteTest extends TestCase {
     builder.addRepeatedForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR);
     assertEquals(emptyList(), message.getRepeatedForeignEnumList());
     assertEquals(
-        singletonList(ForeignEnumLite.FOREIGN_LITE_BAR),
-        builder.getRepeatedForeignEnumList());
+        singletonList(ForeignEnumLite.FOREIGN_LITE_BAR), builder.getRepeatedForeignEnumList());
     assertEquals(emptyList(), message.getRepeatedForeignEnumList());
     messageAfterBuild = builder.build();
     builder.clearRepeatedForeignEnum();
@@ -851,22 +811,17 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addRepeatedForeignMessage(foreignMessage);
     assertEquals(emptyList(), message.getRepeatedForeignMessageList());
-    assertEquals(
-        singletonList(foreignMessage), builder.getRepeatedForeignMessageList());
+    assertEquals(singletonList(foreignMessage), builder.getRepeatedForeignMessageList());
     assertEquals(emptyList(), message.getRepeatedForeignMessageList());
     messageAfterBuild = builder.build();
     builder.removeRepeatedForeignMessage(0);
     assertEquals(emptyList(), builder.getRepeatedForeignMessageList());
-    assertEquals(
-        singletonList(foreignMessage),
-        messageAfterBuild.getRepeatedForeignMessageList());
+    assertEquals(singletonList(foreignMessage), messageAfterBuild.getRepeatedForeignMessageList());
 
     message = builder.build();
     builder.addRepeatedGroup(RepeatedGroup.getDefaultInstance());
     assertEquals(emptyList(), message.getRepeatedGroupList());
-    assertEquals(
-        singletonList(RepeatedGroup.getDefaultInstance()),
-        builder.getRepeatedGroupList());
+    assertEquals(singletonList(RepeatedGroup.getDefaultInstance()), builder.getRepeatedGroupList());
     assertEquals(emptyList(), message.getRepeatedGroupList());
     messageAfterBuild = builder.build();
     builder.removeRepeatedGroup(0);
@@ -898,15 +853,12 @@ public class LiteTest extends TestCase {
     message = builder.build();
     builder.addRepeatedLazyMessage(nestedMessage);
     assertEquals(emptyList(), message.getRepeatedLazyMessageList());
-    assertEquals(
-        singletonList(nestedMessage), builder.getRepeatedLazyMessageList());
+    assertEquals(singletonList(nestedMessage), builder.getRepeatedLazyMessageList());
     assertEquals(emptyList(), message.getRepeatedLazyMessageList());
     messageAfterBuild = builder.build();
     builder.removeRepeatedLazyMessage(0);
     assertEquals(emptyList(), builder.getRepeatedLazyMessageList());
-    assertEquals(
-        singletonList(nestedMessage),
-        messageAfterBuild.getRepeatedLazyMessageList());
+    assertEquals(singletonList(nestedMessage), messageAfterBuild.getRepeatedLazyMessageList());
 
     message = builder.build();
     builder.addRepeatedSfixed32(1);
@@ -926,8 +878,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedSfixed64();
     assertEquals(emptyList(), builder.getRepeatedSfixed64List());
-    assertEquals(
-        singletonList(1L), messageAfterBuild.getRepeatedSfixed64List());
+    assertEquals(singletonList(1L), messageAfterBuild.getRepeatedSfixed64List());
 
     message = builder.build();
     builder.addRepeatedSint32(1);
@@ -957,8 +908,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedString();
     assertEquals(emptyList(), builder.getRepeatedStringList());
-    assertEquals(
-        singletonList("hi"), messageAfterBuild.getRepeatedStringList());
+    assertEquals(singletonList("hi"), messageAfterBuild.getRepeatedStringList());
 
     message = builder.build();
     builder.addRepeatedStringPiece("hi");
@@ -968,8 +918,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     builder.clearRepeatedStringPiece();
     assertEquals(emptyList(), builder.getRepeatedStringPieceList());
-    assertEquals(
-        singletonList("hi"), messageAfterBuild.getRepeatedStringPieceList());
+    assertEquals(singletonList("hi"), messageAfterBuild.getRepeatedStringPieceList());
 
     message = builder.build();
     builder.addRepeatedUint32(1);
@@ -990,7 +939,7 @@ public class LiteTest extends TestCase {
     builder.clearRepeatedUint64();
     assertEquals(emptyList(), builder.getRepeatedUint64List());
     assertEquals(singletonList(1L), messageAfterBuild.getRepeatedUint64List());
-    
+
     message = builder.build();
     builder.addRepeatedBool(true);
     messageAfterBuild = builder.build();
@@ -999,14 +948,13 @@ public class LiteTest extends TestCase {
     assertEquals(true, messageAfterBuild.getRepeatedBool(0));
     assertEquals(false, builder.getRepeatedBool(0));
     builder.clearRepeatedBool();
-    
+
     message = builder.build();
     builder.addRepeatedBytes(ByteString.copyFromUtf8("hi"));
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedBytesCount());
     builder.setRepeatedBytes(0, ByteString.EMPTY);
-    assertEquals(
-        ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedBytes(0));
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedBytes(0));
     assertEquals(ByteString.EMPTY, builder.getRepeatedBytes(0));
     builder.clearRepeatedBytes();
 
@@ -1024,8 +972,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedCordCount());
     builder.setRepeatedCord(0, "");
-    assertEquals(
-        ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedCordBytes(0));
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedCordBytes(0));
     assertEquals(ByteString.EMPTY, builder.getRepeatedCordBytes(0));
     builder.clearRepeatedCord();
 
@@ -1034,8 +981,8 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedDoubleCount());
     builder.setRepeatedDouble(0, 0D);
-    assertEquals(1D, messageAfterBuild.getRepeatedDouble(0));
-    assertEquals(0D, builder.getRepeatedDouble(0));
+    assertEquals(1D, messageAfterBuild.getRepeatedDouble(0), 0.0);
+    assertEquals(0D, builder.getRepeatedDouble(0), 0.0);
     builder.clearRepeatedDouble();
 
     message = builder.build();
@@ -1061,8 +1008,8 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedFloatCount());
     builder.setRepeatedFloat(0, 0F);
-    assertEquals(1F, messageAfterBuild.getRepeatedFloat(0));
-    assertEquals(0F, builder.getRepeatedFloat(0));
+    assertEquals(1F, messageAfterBuild.getRepeatedFloat(0), 0.0f);
+    assertEquals(0F, builder.getRepeatedFloat(0), 0.0f);
     builder.clearRepeatedFloat();
 
     message = builder.build();
@@ -1070,36 +1017,26 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedForeignEnumCount());
     builder.setRepeatedForeignEnum(0, ForeignEnumLite.FOREIGN_LITE_FOO);
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_BAR,
-        messageAfterBuild.getRepeatedForeignEnum(0));
-    assertEquals(
-        ForeignEnumLite.FOREIGN_LITE_FOO, builder.getRepeatedForeignEnum(0));
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_BAR, messageAfterBuild.getRepeatedForeignEnum(0));
+    assertEquals(ForeignEnumLite.FOREIGN_LITE_FOO, builder.getRepeatedForeignEnum(0));
     builder.clearRepeatedForeignEnum();
 
     message = builder.build();
     builder.addRepeatedForeignMessage(foreignMessage);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedForeignMessageCount());
-    builder.setRepeatedForeignMessage(
-        0, ForeignMessageLite.getDefaultInstance());
-    assertEquals(
-        foreignMessage, messageAfterBuild.getRepeatedForeignMessage(0));
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        builder.getRepeatedForeignMessage(0));
+    builder.setRepeatedForeignMessage(0, ForeignMessageLite.getDefaultInstance());
+    assertEquals(foreignMessage, messageAfterBuild.getRepeatedForeignMessage(0));
+    assertEquals(ForeignMessageLite.getDefaultInstance(), builder.getRepeatedForeignMessage(0));
     builder.clearRepeatedForeignMessage();
-    
+
     message = builder.build();
     builder.addRepeatedForeignMessage(foreignMessageBuilder);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedForeignMessageCount());
-    builder.setRepeatedForeignMessage(
-        0, ForeignMessageLite.getDefaultInstance());
+    builder.setRepeatedForeignMessage(0, ForeignMessageLite.getDefaultInstance());
     assertEquals(foreignMessageBuilder.build(), messageAfterBuild.getRepeatedForeignMessage(0));
-    assertEquals(
-        ForeignMessageLite.getDefaultInstance(),
-        builder.getRepeatedForeignMessage(0));
+    assertEquals(ForeignMessageLite.getDefaultInstance(), builder.getRepeatedForeignMessage(0));
     builder.clearRepeatedForeignMessage();
 
     message = builder.build();
@@ -1107,54 +1044,46 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedForeignMessageCount());
     builder.setRepeatedForeignMessage(0, foreignMessageBuilder);
-    assertEquals(
-        foreignMessage, messageAfterBuild.getRepeatedForeignMessage(0));
+    assertEquals(foreignMessage, messageAfterBuild.getRepeatedForeignMessage(0));
     assertEquals(foreignMessageBuilder.build(), builder.getRepeatedForeignMessage(0));
     builder.clearRepeatedForeignMessage();
 
     message = builder.build();
-    RepeatedGroup repeatedGroup = RepeatedGroup.newBuilder()
-        .setA(1)
-        .build();
+    RepeatedGroup repeatedGroup = RepeatedGroup.newBuilder().setA(1).build();
     builder.addRepeatedGroup(repeatedGroup);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedGroupCount());
     builder.setRepeatedGroup(0, RepeatedGroup.getDefaultInstance());
     assertEquals(repeatedGroup, messageAfterBuild.getRepeatedGroup(0));
-    assertEquals(
-        RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
+    assertEquals(RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
     builder.clearRepeatedGroup();
-    
+
     message = builder.build();
     builder.addRepeatedGroup(0, repeatedGroup);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedGroupCount());
     builder.setRepeatedGroup(0, RepeatedGroup.getDefaultInstance());
     assertEquals(repeatedGroup, messageAfterBuild.getRepeatedGroup(0));
-    assertEquals(
-        RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
+    assertEquals(RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
     builder.clearRepeatedGroup();
-    
+
     message = builder.build();
-    RepeatedGroup.Builder repeatedGroupBuilder = RepeatedGroup.newBuilder()
-        .setA(3);
+    RepeatedGroup.Builder repeatedGroupBuilder = RepeatedGroup.newBuilder().setA(3);
     builder.addRepeatedGroup(repeatedGroupBuilder);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedGroupCount());
     builder.setRepeatedGroup(0, RepeatedGroup.getDefaultInstance());
     assertEquals(repeatedGroupBuilder.build(), messageAfterBuild.getRepeatedGroup(0));
-    assertEquals(
-        RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
+    assertEquals(RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
     builder.clearRepeatedGroup();
-    
+
     message = builder.build();
     builder.addRepeatedGroup(0, repeatedGroupBuilder);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedGroupCount());
     builder.setRepeatedGroup(0, RepeatedGroup.getDefaultInstance());
     assertEquals(repeatedGroupBuilder.build(), messageAfterBuild.getRepeatedGroup(0));
-    assertEquals(
-        RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
+    assertEquals(RepeatedGroup.getDefaultInstance(), builder.getRepeatedGroup(0));
     builder.clearRepeatedGroup();
 
     message = builder.build();
@@ -1174,45 +1103,41 @@ public class LiteTest extends TestCase {
     assertEquals(1L, messageAfterBuild.getRepeatedInt64(0));
     assertEquals(0L, builder.getRepeatedInt64(0));
     builder.clearRepeatedInt64();
-    
+
     message = builder.build();
     builder.addRepeatedLazyMessage(nestedMessage);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedLazyMessageCount());
     builder.setRepeatedLazyMessage(0, NestedMessage.getDefaultInstance());
     assertEquals(nestedMessage, messageAfterBuild.getRepeatedLazyMessage(0));
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
     builder.clearRepeatedLazyMessage();
-    
+
     message = builder.build();
     builder.addRepeatedLazyMessage(0, nestedMessage);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedLazyMessageCount());
     builder.setRepeatedLazyMessage(0, NestedMessage.getDefaultInstance());
     assertEquals(nestedMessage, messageAfterBuild.getRepeatedLazyMessage(0));
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
     builder.clearRepeatedLazyMessage();
-    
+
     message = builder.build();
     builder.addRepeatedLazyMessage(nestedMessageBuilder);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedLazyMessageCount());
     builder.setRepeatedLazyMessage(0, NestedMessage.getDefaultInstance());
     assertEquals(nestedMessageBuilder.build(), messageAfterBuild.getRepeatedLazyMessage(0));
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
     builder.clearRepeatedLazyMessage();
-    
+
     message = builder.build();
     builder.addRepeatedLazyMessage(0, nestedMessageBuilder);
     messageAfterBuild = builder.build();
     assertEquals(0, message.getRepeatedLazyMessageCount());
     builder.setRepeatedLazyMessage(0, NestedMessage.getDefaultInstance());
     assertEquals(nestedMessageBuilder.build(), messageAfterBuild.getRepeatedLazyMessage(0));
-    assertEquals(
-        NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
+    assertEquals(NestedMessage.getDefaultInstance(), builder.getRepeatedLazyMessage(0));
     builder.clearRepeatedLazyMessage();
 
     message = builder.build();
@@ -1265,9 +1190,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0L, message.getRepeatedStringCount());
     builder.setRepeatedString(0, "");
-    assertEquals(
-        ByteString.copyFromUtf8("hi"),
-        messageAfterBuild.getRepeatedStringBytes(0));
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedStringBytes(0));
     assertEquals(ByteString.EMPTY, builder.getRepeatedStringBytes(0));
     builder.clearRepeatedString();
 
@@ -1285,9 +1208,7 @@ public class LiteTest extends TestCase {
     messageAfterBuild = builder.build();
     assertEquals(0L, message.getRepeatedStringPieceCount());
     builder.setRepeatedStringPiece(0, "");
-    assertEquals(
-        ByteString.copyFromUtf8("hi"),
-        messageAfterBuild.getRepeatedStringPieceBytes(0));
+    assertEquals(ByteString.copyFromUtf8("hi"), messageAfterBuild.getRepeatedStringPieceBytes(0));
     assertEquals(ByteString.EMPTY, builder.getRepeatedStringPieceBytes(0));
     builder.clearRepeatedStringPiece();
 
@@ -1311,18 +1232,14 @@ public class LiteTest extends TestCase {
 
     message = builder.build();
     assertEquals(0, message.getSerializedSize());
-    builder.mergeFrom(TestAllTypesLite.newBuilder()
-        .setOptionalBool(true)
-        .build());
+    builder.mergeFrom(TestAllTypesLite.newBuilder().setOptionalBool(true).build());
     assertEquals(0, message.getSerializedSize());
     assertEquals(true, builder.build().getOptionalBool());
     builder.clearOptionalBool();
 
     message = builder.build();
     assertEquals(0, message.getSerializedSize());
-    builder.mergeFrom(TestAllTypesLite.newBuilder()
-        .setOptionalBool(true)
-        .build());
+    builder.mergeFrom(TestAllTypesLite.newBuilder().setOptionalBool(true).build());
     assertEquals(0, message.getSerializedSize());
     assertEquals(true, builder.build().getOptionalBool());
     builder.clear();
@@ -1332,93 +1249,107 @@ public class LiteTest extends TestCase {
     assertEquals(0, message.getSerializedSize());
     builder.mergeOptionalForeignMessage(foreignMessage);
     assertEquals(0, message.getSerializedSize());
-    assertEquals(
-        foreignMessage.getC(),
-        builder.build().getOptionalForeignMessage().getC());
+    assertEquals(foreignMessage.getC(), builder.build().getOptionalForeignMessage().getC());
     builder.clearOptionalForeignMessage();
 
     message = builder.build();
     assertEquals(0, message.getSerializedSize());
     builder.mergeOptionalLazyMessage(nestedMessage);
     assertEquals(0, message.getSerializedSize());
-    assertEquals(
-        nestedMessage.getBb(),
-        builder.build().getOptionalLazyMessage().getBb());
+    assertEquals(nestedMessage.getBb(), builder.build().getOptionalLazyMessage().getBb());
     builder.clearOptionalLazyMessage();
-    
+
     message = builder.build();
     builder.setOneofString("hi");
-    assertEquals(
-        OneofFieldCase.ONEOFFIELD_NOT_SET, message.getOneofFieldCase());
+    assertEquals(OneofFieldCase.ONEOFFIELD_NOT_SET, message.getOneofFieldCase());
     assertEquals(OneofFieldCase.ONEOF_STRING, builder.getOneofFieldCase());
     assertEquals("hi", builder.getOneofString());
     messageAfterBuild = builder.build();
-    assertEquals(
-        OneofFieldCase.ONEOF_STRING, messageAfterBuild.getOneofFieldCase());
+    assertEquals(OneofFieldCase.ONEOF_STRING, messageAfterBuild.getOneofFieldCase());
     assertEquals("hi", messageAfterBuild.getOneofString());
     builder.setOneofUint32(1);
-    assertEquals(
-        OneofFieldCase.ONEOF_STRING, messageAfterBuild.getOneofFieldCase());
+    assertEquals(OneofFieldCase.ONEOF_STRING, messageAfterBuild.getOneofFieldCase());
     assertEquals("hi", messageAfterBuild.getOneofString());
     assertEquals(OneofFieldCase.ONEOF_UINT32, builder.getOneofFieldCase());
     assertEquals(1, builder.getOneofUint32());
     TestAllTypesLiteOrBuilder messageOrBuilder = builder;
     assertEquals(OneofFieldCase.ONEOF_UINT32, messageOrBuilder.getOneofFieldCase());
-    
-    TestAllExtensionsLite.Builder extendableMessageBuilder =
-        TestAllExtensionsLite.newBuilder();
+
+    TestAllExtensionsLite.Builder extendableMessageBuilder = TestAllExtensionsLite.newBuilder();
     TestAllExtensionsLite extendableMessage = extendableMessageBuilder.build();
-    extendableMessageBuilder.setExtension(
-        UnittestLite.optionalInt32ExtensionLite, 1);
-    assertFalse(extendableMessage.hasExtension(
-        UnittestLite.optionalInt32ExtensionLite));
+    extendableMessageBuilder.setExtension(UnittestLite.optionalInt32ExtensionLite, 1);
+    assertFalse(extendableMessage.hasExtension(UnittestLite.optionalInt32ExtensionLite));
     extendableMessage = extendableMessageBuilder.build();
     assertEquals(
-        1, (int) extendableMessageBuilder.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(
-        1, (int) extendableMessage.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    extendableMessageBuilder.setExtension(
-        UnittestLite.optionalInt32ExtensionLite, 3);
+        1, (int) extendableMessageBuilder.getExtension(UnittestLite.optionalInt32ExtensionLite));
+    assertEquals(1, (int) extendableMessage.getExtension(UnittestLite.optionalInt32ExtensionLite));
+    extendableMessageBuilder.setExtension(UnittestLite.optionalInt32ExtensionLite, 3);
     assertEquals(
-        3, (int) extendableMessageBuilder.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(
-        1, (int) extendableMessage.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
+        3, (int) extendableMessageBuilder.getExtension(UnittestLite.optionalInt32ExtensionLite));
+    assertEquals(1, (int) extendableMessage.getExtension(UnittestLite.optionalInt32ExtensionLite));
     extendableMessage = extendableMessageBuilder.build();
     assertEquals(
-        3, (int) extendableMessageBuilder.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(
-        3, (int) extendableMessage.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    
+        3, (int) extendableMessageBuilder.getExtension(UnittestLite.optionalInt32ExtensionLite));
+    assertEquals(3, (int) extendableMessage.getExtension(UnittestLite.optionalInt32ExtensionLite));
+
     // No extension registry, so it should be in unknown fields.
-    extendableMessage =
-        TestAllExtensionsLite.parseFrom(extendableMessage.toByteArray());
-    assertFalse(extendableMessage.hasExtension(
-        UnittestLite.optionalInt32ExtensionLite));
-    
+    extendableMessage = TestAllExtensionsLite.parseFrom(extendableMessage.toByteArray());
+    assertFalse(extendableMessage.hasExtension(UnittestLite.optionalInt32ExtensionLite));
+
     extendableMessageBuilder = extendableMessage.toBuilder();
-    extendableMessageBuilder.mergeFrom(TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalFixed32ExtensionLite, 11)
-        .build());
-    
+    extendableMessageBuilder.mergeFrom(
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalFixed32ExtensionLite, 11)
+            .build());
+
     extendableMessage = extendableMessageBuilder.build();
     ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
     UnittestLite.registerAllExtensions(registry);
-    extendableMessage = TestAllExtensionsLite.parseFrom(
-        extendableMessage.toByteArray(), registry);
-    
+    extendableMessage = TestAllExtensionsLite.parseFrom(extendableMessage.toByteArray(), registry);
+
     // The unknown field was preserved.
+    assertEquals(3, (int) extendableMessage.getExtension(UnittestLite.optionalInt32ExtensionLite));
     assertEquals(
-        3, (int) extendableMessage.getExtension(
-            UnittestLite.optionalInt32ExtensionLite));
-    assertEquals(
-        11, (int) extendableMessage.getExtension(
-            UnittestLite.optionalFixed32ExtensionLite));
+        11, (int) extendableMessage.getExtension(UnittestLite.optionalFixed32ExtensionLite));
+  }
+
+  public void testBuilderMergeFromNull() throws Exception {
+    try {
+      TestAllTypesLite.newBuilder().mergeFrom((TestAllTypesLite) null);
+      fail("Expected exception");
+    } catch (NullPointerException e) {
+      // Pass.
+    }
+  }
+
+  // Builder.mergeFrom() should keep existing extensions.
+  public void testBuilderMergeFromWithExtensions() throws Exception {
+    TestAllExtensionsLite message =
+        TestAllExtensionsLite.newBuilder()
+            .addExtension(UnittestLite.repeatedInt32ExtensionLite, 12)
+            .build();
+
+    ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
+    UnittestLite.registerAllExtensions(registry);
+
+    TestAllExtensionsLite.Builder builder = TestAllExtensionsLite.newBuilder();
+    builder.mergeFrom(message.toByteArray(), registry);
+    builder.mergeFrom(message.toByteArray(), registry);
+    TestAllExtensionsLite result = builder.build();
+    assertEquals(2, result.getExtensionCount(UnittestLite.repeatedInt32ExtensionLite));
+    assertEquals(12, result.getExtension(UnittestLite.repeatedInt32ExtensionLite, 0).intValue());
+    assertEquals(12, result.getExtension(UnittestLite.repeatedInt32ExtensionLite, 1).intValue());
+  }
+
+  // Builder.mergeFrom() should keep existing unknown fields.
+  public void testBuilderMergeFromWithUnknownFields() throws Exception {
+    TestAllTypesLite message = TestAllTypesLite.newBuilder().addRepeatedInt32(1).build();
+
+    NestedMessage.Builder builder = NestedMessage.newBuilder();
+    builder.mergeFrom(message.toByteArray());
+    builder.mergeFrom(message.toByteArray());
+    NestedMessage result = builder.build();
+    assertEquals(message.getSerializedSize() * 2, result.getSerializedSize());
   }
 
   public void testToStringDefaultInstance() throws Exception {
@@ -1426,140 +1357,174 @@ public class LiteTest extends TestCase {
   }
 
   public void testToStringScalarFieldsSuffixedWithList() throws Exception {
-    assertToStringEquals("deceptively_named_list: 7", TestAllTypesLite.newBuilder()
-        .setDeceptivelyNamedList(7)
-        .build());
+    assertToStringEquals(
+        "deceptively_named_list: 7",
+        TestAllTypesLite.newBuilder().setDeceptivelyNamedList(7).build());
   }
 
   public void testToStringPrimitives() throws Exception {
-    TestAllTypesLite proto = TestAllTypesLite.newBuilder()
-        .setOptionalInt32(1)
-        .setOptionalInt64(9223372036854775807L)
-        .build();
+    TestAllTypesLite proto =
+        TestAllTypesLite.newBuilder()
+            .setOptionalInt32(1)
+            .setOptionalInt64(9223372036854775807L)
+            .build();
     assertToStringEquals("optional_int32: 1\noptional_int64: 9223372036854775807", proto);
 
-    proto = TestAllTypesLite.newBuilder()
-        .setOptionalBool(true)
-        .setOptionalNestedEnum(TestAllTypesLite.NestedEnum.BAZ)
-        .build();
+    proto =
+        TestAllTypesLite.newBuilder()
+            .setOptionalBool(true)
+            .setOptionalNestedEnum(TestAllTypesLite.NestedEnum.BAZ)
+            .build();
     assertToStringEquals("optional_bool: true\noptional_nested_enum: BAZ", proto);
 
-    proto = TestAllTypesLite.newBuilder()
-        .setOptionalFloat(2.72f)
-        .setOptionalDouble(3.14)
-        .build();
+    proto = TestAllTypesLite.newBuilder().setOptionalFloat(2.72f).setOptionalDouble(3.14).build();
     assertToStringEquals("optional_double: 3.14\noptional_float: 2.72", proto);
   }
 
   public void testToStringStringFields() throws Exception {
-    TestAllTypesLite proto = TestAllTypesLite.newBuilder()
-        .setOptionalString("foo\"bar\nbaz\\")
-        .build();
+    TestAllTypesLite proto =
+        TestAllTypesLite.newBuilder().setOptionalString("foo\"bar\nbaz\\").build();
     assertToStringEquals("optional_string: \"foo\\\"bar\\nbaz\\\\\"", proto);
 
-    proto = TestAllTypesLite.newBuilder()
-        .setOptionalString("\u6587")
-        .build();
+    proto = TestAllTypesLite.newBuilder().setOptionalString("\u6587").build();
     assertToStringEquals("optional_string: \"\\346\\226\\207\"", proto);
   }
 
   public void testToStringNestedMessage() throws Exception {
-    TestAllTypesLite proto = TestAllTypesLite.newBuilder()
-        .setOptionalNestedMessage(TestAllTypesLite.NestedMessage.getDefaultInstance())
-        .build();
+    TestAllTypesLite proto =
+        TestAllTypesLite.newBuilder()
+            .setOptionalNestedMessage(TestAllTypesLite.NestedMessage.getDefaultInstance())
+            .build();
     assertToStringEquals("optional_nested_message {\n}", proto);
 
-    proto = TestAllTypesLite.newBuilder()
-        .setOptionalNestedMessage(
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
-        .build();
+    proto =
+        TestAllTypesLite.newBuilder()
+            .setOptionalNestedMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
+            .build();
     assertToStringEquals("optional_nested_message {\n  bb: 7\n}", proto);
   }
 
   public void testToStringRepeatedFields() throws Exception {
-    TestAllTypesLite proto = TestAllTypesLite.newBuilder()
-        .addRepeatedInt32(32)
-        .addRepeatedInt32(32)
-        .addRepeatedInt64(64)
-        .build();
+    TestAllTypesLite proto =
+        TestAllTypesLite.newBuilder()
+            .addRepeatedInt32(32)
+            .addRepeatedInt32(32)
+            .addRepeatedInt64(64)
+            .build();
     assertToStringEquals("repeated_int32: 32\nrepeated_int32: 32\nrepeated_int64: 64", proto);
 
-    proto = TestAllTypesLite.newBuilder()
-        .addRepeatedLazyMessage(
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
-        .addRepeatedLazyMessage(
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(8))
-        .build();
+    proto =
+        TestAllTypesLite.newBuilder()
+            .addRepeatedLazyMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
+            .addRepeatedLazyMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(8))
+            .build();
     assertToStringEquals(
-        "repeated_lazy_message {\n  bb: 7\n}\nrepeated_lazy_message {\n  bb: 8\n}",
-        proto);
+        "repeated_lazy_message {\n  bb: 7\n}\nrepeated_lazy_message {\n  bb: 8\n}", proto);
   }
 
   public void testToStringForeignFields() throws Exception {
-    TestAllTypesLite proto = TestAllTypesLite.newBuilder()
-        .setOptionalForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
-        .setOptionalForeignMessage(
-            ForeignMessageLite.newBuilder()
-            .setC(3))
-        .build();
+    TestAllTypesLite proto =
+        TestAllTypesLite.newBuilder()
+            .setOptionalForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
+            .setOptionalForeignMessage(ForeignMessageLite.newBuilder().setC(3))
+            .build();
     assertToStringEquals(
-        "optional_foreign_enum: FOREIGN_LITE_BAR\noptional_foreign_message {\n  c: 3\n}",
-        proto);
+        "optional_foreign_enum: FOREIGN_LITE_BAR\noptional_foreign_message {\n  c: 3\n}", proto);
   }
 
   public void testToStringExtensions() throws Exception {
-    TestAllExtensionsLite message = TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
-        .addExtension(UnittestLite.repeatedStringExtensionLite, "spam")
-        .addExtension(UnittestLite.repeatedStringExtensionLite, "eggs")
-        .setExtension(UnittestLite.optionalNestedEnumExtensionLite,
-            TestAllTypesLite.NestedEnum.BAZ)
-        .setExtension(UnittestLite.optionalNestedMessageExtensionLite,
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
-        .build();
+    TestAllExtensionsLite message =
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "spam")
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "eggs")
+            .setExtension(
+                UnittestLite.optionalNestedEnumExtensionLite, TestAllTypesLite.NestedEnum.BAZ)
+            .setExtension(
+                UnittestLite.optionalNestedMessageExtensionLite,
+                TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
+            .build();
     assertToStringEquals(
-        "[1]: 123\n[18] {\n  bb: 7\n}\n[21]: 3\n[44]: \"spam\"\n[44]: \"eggs\"",
-        message);
+        "[1]: 123\n[18] {\n  bb: 7\n}\n[21]: 3\n[44]: \"spam\"\n[44]: \"eggs\"", message);
   }
 
   public void testToStringUnknownFields() throws Exception {
-    TestAllExtensionsLite messageWithExtensions = TestAllExtensionsLite.newBuilder()
-        .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
-        .addExtension(UnittestLite.repeatedStringExtensionLite, "spam")
-        .addExtension(UnittestLite.repeatedStringExtensionLite, "eggs")
-        .setExtension(UnittestLite.optionalNestedEnumExtensionLite,
-            TestAllTypesLite.NestedEnum.BAZ)
-        .setExtension(UnittestLite.optionalNestedMessageExtensionLite,
-            TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
-        .build();
-    TestAllExtensionsLite messageWithUnknownFields = TestAllExtensionsLite.parseFrom(
-        messageWithExtensions.toByteArray());
+    TestAllExtensionsLite messageWithExtensions =
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "spam")
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "eggs")
+            .setExtension(
+                UnittestLite.optionalNestedEnumExtensionLite, TestAllTypesLite.NestedEnum.BAZ)
+            .setExtension(
+                UnittestLite.optionalNestedMessageExtensionLite,
+                TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
+            .build();
+    TestAllExtensionsLite messageWithUnknownFields =
+        TestAllExtensionsLite.parseFrom(messageWithExtensions.toByteArray());
     assertToStringEquals(
-        "1: 123\n18: \"\\b\\a\"\n21: 3\n44: \"spam\"\n44: \"eggs\"",
-        messageWithUnknownFields);
+        "1: 123\n18: \"\\b\\a\"\n21: 3\n44: \"spam\"\n44: \"eggs\"", messageWithUnknownFields);
   }
-  
+
   public void testToStringLazyMessage() throws Exception {
-    TestAllTypesLite message = TestAllTypesLite.newBuilder()
-        .setOptionalLazyMessage(NestedMessage.newBuilder().setBb(1).build())
-        .build();
+    TestAllTypesLite message =
+        TestAllTypesLite.newBuilder()
+            .setOptionalLazyMessage(NestedMessage.newBuilder().setBb(1).build())
+            .build();
     assertToStringEquals("optional_lazy_message {\n  bb: 1\n}", message);
   }
-  
+
   public void testToStringGroup() throws Exception {
-    TestAllTypesLite message = TestAllTypesLite.newBuilder()
-        .setOptionalGroup(OptionalGroup.newBuilder().setA(1).build())
-        .build();
+    TestAllTypesLite message =
+        TestAllTypesLite.newBuilder()
+            .setOptionalGroup(OptionalGroup.newBuilder().setA(1).build())
+            .build();
     assertToStringEquals("optional_group {\n  a: 1\n}", message);
   }
-  
+
   public void testToStringOneof() throws Exception {
-    TestAllTypesLite message = TestAllTypesLite.newBuilder()
-        .setOneofString("hello")
-        .build();
+    TestAllTypesLite message = TestAllTypesLite.newBuilder().setOneofString("hello").build();
     assertToStringEquals("oneof_string: \"hello\"", message);
   }
 
+  public void testToStringMapFields() throws Exception {
+    TestMap message1 =
+        TestMap.newBuilder()
+            .putInt32ToStringField(1, "alpha")
+            .putInt32ToStringField(2, "beta")
+            .build();
+    assertToStringEquals(
+        "int32_to_string_field {\n"
+            + "  key: 1\n"
+            + "  value: \"alpha\"\n"
+            + "}\n"
+            + "int32_to_string_field {\n"
+            + "  key: 2\n"
+            + "  value: \"beta\"\n"
+            + "}",
+        message1);
+
+    TestMap message2 =
+        TestMap.newBuilder()
+            .putInt32ToMessageField(1, MessageValue.newBuilder().setValue(10).build())
+            .putInt32ToMessageField(2, MessageValue.newBuilder().setValue(20).build())
+            .build();
+    assertToStringEquals(
+        "int32_to_message_field {\n"
+            + "  key: 1\n"
+            + "  value {\n"
+            + "    value: 10\n"
+            + "  }\n"
+            + "}\n"
+            + "int32_to_message_field {\n"
+            + "  key: 2\n"
+            + "  value {\n"
+            + "    value: 20\n"
+            + "  }\n"
+            + "}",
+        message2);
+  }
+
   // Asserts that the toString() representation of the message matches the expected. This verifies
   // the first line starts with a comment; but, does not factor in said comment as part of the
   // comparison as it contains unstable addresses.
@@ -1573,38 +1538,38 @@ public class LiteTest extends TestCase {
     }
     assertEquals(expected, toString);
   }
-  
+
   public void testParseLazy() throws Exception {
-    ByteString bb = TestAllTypesLite.newBuilder()
-        .setOptionalLazyMessage(NestedMessage.newBuilder()
-            .setBb(11)
-            .build())
-        .build().toByteString();
-    ByteString cc = TestAllTypesLite.newBuilder()
-        .setOptionalLazyMessage(NestedMessage.newBuilder()
-            .setCc(22)
-            .build())
-        .build().toByteString();
-    
+    ByteString bb =
+        TestAllTypesLite.newBuilder()
+            .setOptionalLazyMessage(NestedMessage.newBuilder().setBb(11).build())
+            .build()
+            .toByteString();
+    ByteString cc =
+        TestAllTypesLite.newBuilder()
+            .setOptionalLazyMessage(NestedMessage.newBuilder().setCc(22).build())
+            .build()
+            .toByteString();
+
     ByteString concat = bb.concat(cc);
     TestAllTypesLite message = TestAllTypesLite.parseFrom(concat);
 
     assertEquals(11, message.getOptionalLazyMessage().getBb());
     assertEquals(22L, message.getOptionalLazyMessage().getCc());
   }
-  
+
   public void testParseLazy_oneOf() throws Exception {
-    ByteString bb = TestAllTypesLite.newBuilder()
-        .setOneofLazyNestedMessage(NestedMessage.newBuilder()
-            .setBb(11)
-            .build())
-        .build().toByteString();
-    ByteString cc = TestAllTypesLite.newBuilder()
-        .setOneofLazyNestedMessage(NestedMessage.newBuilder()
-            .setCc(22)
-            .build())
-        .build().toByteString();
-    
+    ByteString bb =
+        TestAllTypesLite.newBuilder()
+            .setOneofLazyNestedMessage(NestedMessage.newBuilder().setBb(11).build())
+            .build()
+            .toByteString();
+    ByteString cc =
+        TestAllTypesLite.newBuilder()
+            .setOneofLazyNestedMessage(NestedMessage.newBuilder().setCc(22).build())
+            .build()
+            .toByteString();
+
     ByteString concat = bb.concat(cc);
     TestAllTypesLite message = TestAllTypesLite.parseFrom(concat);
 
@@ -1613,27 +1578,26 @@ public class LiteTest extends TestCase {
   }
 
   public void testMergeFromStream_repeatedField() throws Exception {
-    TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder()
-        .addRepeatedString("hello");
+    TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder().addRepeatedString("hello");
     builder.mergeFrom(CodedInputStream.newInstance(builder.build().toByteArray()));
 
     assertEquals(2, builder.getRepeatedStringCount());
   }
 
   public void testMergeFromStream_invalidBytes() throws Exception {
-    TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder()
-        .setDefaultBool(true);
+    TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder().setDefaultBool(true);
     try {
       builder.mergeFrom(CodedInputStream.newInstance("Invalid bytes".getBytes(Internal.UTF_8)));
       fail();
-    } catch (InvalidProtocolBufferException expected) {}
+    } catch (InvalidProtocolBufferException expected) {
+    }
   }
 
   public void testMergeFrom_sanity() throws Exception {
     TestAllTypesLite one = TestUtilLite.getAllLiteSetBuilder().build();
     byte[] bytes = one.toByteArray();
     TestAllTypesLite two = TestAllTypesLite.parseFrom(bytes);
-    
+
     one = one.toBuilder().mergeFrom(one).build();
     two = two.toBuilder().mergeFrom(bytes).build();
     assertEquals(one, two);
@@ -1642,14 +1606,14 @@ public class LiteTest extends TestCase {
   }
 
   public void testMergeFromNoLazyFieldSharing() throws Exception {
-    TestAllTypesLite.Builder sourceBuilder = TestAllTypesLite.newBuilder().setOptionalLazyMessage(
-        TestAllTypesLite.NestedMessage.newBuilder().setBb(1));
+    TestAllTypesLite.Builder sourceBuilder =
+        TestAllTypesLite.newBuilder()
+            .setOptionalLazyMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(1));
     TestAllTypesLite.Builder targetBuilder =
         TestAllTypesLite.newBuilder().mergeFrom(sourceBuilder.build());
     assertEquals(1, sourceBuilder.getOptionalLazyMessage().getBb());
     // now change the sourceBuilder, and target value shouldn't be affected.
-    sourceBuilder.setOptionalLazyMessage(
-        TestAllTypesLite.NestedMessage.newBuilder().setBb(2));
+    sourceBuilder.setOptionalLazyMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(2));
     assertEquals(1, targetBuilder.getOptionalLazyMessage().getBb());
   }
 
@@ -1657,508 +1621,373 @@ public class LiteTest extends TestCase {
     TestAllTypesLite one = TestUtilLite.getAllLiteSetBuilder().build();
     byte[] bytes = one.toByteArray();
     TestAllTypesLite two = one.toBuilder().mergeFrom(one).mergeFrom(bytes).build();
-    
+
     assertFalse(one.equals(two));
     assertFalse(two.equals(one));
-    
+
     assertFalse(one.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(one));
-    
-    TestAllTypesLite oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultBool(true)
-        .build();
+
+    TestAllTypesLite oneFieldSet = TestAllTypesLite.newBuilder().setDefaultBool(true).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultCord("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultCord("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultCordBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultCordBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultDouble(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultDouble(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultFixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultFixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultFixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultFixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultFloat(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultFloat(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setDefaultForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultImportEnum(ImportEnumLite.IMPORT_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().setDefaultImportEnum(ImportEnumLite.IMPORT_LITE_BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultInt32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultInt32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultInt64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultInt64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultNestedEnum(NestedEnum.BAR)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultNestedEnum(NestedEnum.BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultSfixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultSfixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultSfixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultSfixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultSint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultSint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultSint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultSint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultString("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultString("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultStringBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultStringBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultStringPiece("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultStringPiece("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultStringPieceBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().setDefaultStringPieceBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultUint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultUint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setDefaultUint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setDefaultUint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedBool(true)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedBool(true).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedCord("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedCord("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedCordBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedCordBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedDouble(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedDouble(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedFixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedFixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedFixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedFixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedFloat(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedFloat(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .addRepeatedForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedImportEnum(ImportEnumLite.IMPORT_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().addRepeatedImportEnum(ImportEnumLite.IMPORT_LITE_BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedInt32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedInt32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedInt64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedInt64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedNestedEnum(NestedEnum.BAR)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedNestedEnum(NestedEnum.BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedSfixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedSfixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedSfixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedSfixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedSint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedSint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedSint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedSint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedString("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedString("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedStringBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedStringBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedStringPiece("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedStringPiece("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedStringPieceBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().addRepeatedStringPieceBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedUint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedUint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedUint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().addRepeatedUint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalBool(true)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalBool(true).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalCord("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalCord("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalCordBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalCordBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalDouble(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalDouble(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalFixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalFixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalFixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalFixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalFloat(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalFloat(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOptionalForeignEnum(ForeignEnumLite.FOREIGN_LITE_BAR)
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalImportEnum(ImportEnumLite.IMPORT_LITE_BAR)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().setOptionalImportEnum(ImportEnumLite.IMPORT_LITE_BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalInt32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalInt32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalInt64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalInt64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalNestedEnum(NestedEnum.BAR)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalNestedEnum(NestedEnum.BAR).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalSfixed32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalSfixed32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalSfixed64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalSfixed64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalSint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalSint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalSint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalSint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalString("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalString("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalStringBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalStringBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalStringPiece("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalStringPiece("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalStringPieceBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().setOptionalStringPieceBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalUint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalUint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalUint64(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOptionalUint64(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOneofBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofLazyNestedMessage(NestedMessage.getDefaultInstance())
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOneofLazyNestedMessage(NestedMessage.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofNestedMessage(NestedMessage.getDefaultInstance())
-        .build();
+
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOneofNestedMessage(NestedMessage.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofString("")
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOneofString("").build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofStringBytes(ByteString.EMPTY)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOneofStringBytes(ByteString.EMPTY).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOneofUint32(0)
-        .build();
+
+    oneFieldSet = TestAllTypesLite.newBuilder().setOneofUint32(0).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
 
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalForeignMessage(ForeignMessageLite.getDefaultInstance())
-        .build();
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOptionalForeignMessage(ForeignMessageLite.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
 
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalGroup(OptionalGroup.getDefaultInstance())
-        .build();
+    oneFieldSet =
+        TestAllTypesLite.newBuilder().setOptionalGroup(OptionalGroup.getDefaultInstance()).build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
 
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalPublicImportMessage(PublicImportMessageLite.getDefaultInstance())
-        .build();
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOptionalPublicImportMessage(PublicImportMessageLite.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
 
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .setOptionalLazyMessage(NestedMessage.getDefaultInstance())
-        .build();
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .setOptionalLazyMessage(NestedMessage.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
-    
+
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
-    oneFieldSet = TestAllTypesLite.newBuilder()
-        .addRepeatedLazyMessage(NestedMessage.getDefaultInstance())
-        .build();
+    oneFieldSet =
+        TestAllTypesLite.newBuilder()
+            .addRepeatedLazyMessage(NestedMessage.getDefaultInstance())
+            .build();
     assertFalse(oneFieldSet.equals(TestAllTypesLite.getDefaultInstance()));
     assertFalse(TestAllTypesLite.getDefaultInstance().equals(oneFieldSet));
   }
 
   public void testEquals() throws Exception {
     // Check that two identical objs are equal.
-    Foo foo1a = Foo.newBuilder()
-        .setValue(1)
-        .addBar(Bar.newBuilder().setName("foo1"))
-        .build();
-    Foo foo1b = Foo.newBuilder()
-        .setValue(1)
-        .addBar(Bar.newBuilder().setName("foo1"))
-        .build();
-    Foo foo2 = Foo.newBuilder()
-        .setValue(1)
-        .addBar(Bar.newBuilder().setName("foo2"))
-        .build();
+    Foo foo1a = Foo.newBuilder().setValue(1).addBar(Bar.newBuilder().setName("foo1")).build();
+    Foo foo1b = Foo.newBuilder().setValue(1).addBar(Bar.newBuilder().setName("foo1")).build();
+    Foo foo2 = Foo.newBuilder().setValue(1).addBar(Bar.newBuilder().setName("foo2")).build();
 
     // Check that equals is doing value rather than object equality.
     assertEquals(foo1a, foo1b);
@@ -2174,6 +2003,17 @@ public class LiteTest extends TestCase {
     assertFalse(bar.equals(barPrime));
   }
 
+  public void testEqualsAndHashCodeForTrickySchemaTypes() {
+    Foo foo1 = Foo.getDefaultInstance();
+    Foo foo2 = Foo.newBuilder().setSint64(1).build();
+    Foo foo3 = Foo.newBuilder().putMyMap("key", "value2").build();
+    Foo foo4 = Foo.newBuilder().setMyGroup(Foo.MyGroup.newBuilder().setValue(4).build()).build();
+
+    assertEqualsAndHashCodeAreFalse(foo1, foo2);
+    assertEqualsAndHashCodeAreFalse(foo1, foo3);
+    assertEqualsAndHashCodeAreFalse(foo1, foo4);
+  }
+
   public void testOneofEquals() throws Exception {
     TestOneofEquals.Builder builder = TestOneofEquals.newBuilder();
     TestOneofEquals message1 = builder.build();
@@ -2183,29 +2023,27 @@ public class LiteTest extends TestCase {
     TestOneofEquals message2 = builder.build();
     assertFalse(message1.equals(message2));
   }
-  
+
   public void testEquals_sanity() throws Exception {
     TestAllTypesLite one = TestUtilLite.getAllLiteSetBuilder().build();
     TestAllTypesLite two = TestAllTypesLite.parseFrom(one.toByteArray());
     assertEquals(one, two);
     assertEquals(one.hashCode(), two.hashCode());
-    
+
     assertEquals(
         one.toBuilder().mergeFrom(two).build(),
         two.toBuilder().mergeFrom(two.toByteArray()).build());
   }
 
   public void testEqualsAndHashCodeWithUnknownFields() throws InvalidProtocolBufferException {
-    Foo fooWithOnlyValue = Foo.newBuilder()
-        .setValue(1)
-        .build();
+    Foo fooWithOnlyValue = Foo.newBuilder().setValue(1).build();
 
-    Foo fooWithValueAndExtension = fooWithOnlyValue.toBuilder()
-        .setValue(1)
-        .setExtension(Bar.fooExt, Bar.newBuilder()
-            .setName("name")
-            .build())
-        .build();
+    Foo fooWithValueAndExtension =
+        fooWithOnlyValue
+            .toBuilder()
+            .setValue(1)
+            .setExtension(Bar.fooExt, Bar.newBuilder().setName("name").build())
+            .build();
 
     Foo fooWithValueAndUnknownFields = Foo.parseFrom(fooWithValueAndExtension.toByteArray());
 
@@ -2214,30 +2052,27 @@ public class LiteTest extends TestCase {
   }
 
   public void testEqualsAndHashCodeWithExtensions() throws InvalidProtocolBufferException {
-    Foo fooWithOnlyValue = Foo.newBuilder()
-        .setValue(1)
-        .build();
+    Foo fooWithOnlyValue = Foo.newBuilder().setValue(1).build();
 
-    Foo fooWithValueAndExtension = fooWithOnlyValue.toBuilder()
-        .setValue(1)
-        .setExtension(Bar.fooExt, Bar.newBuilder()
-            .setName("name")
-            .build())
-        .build();
+    Foo fooWithValueAndExtension =
+        fooWithOnlyValue
+            .toBuilder()
+            .setValue(1)
+            .setExtension(Bar.fooExt, Bar.newBuilder().setName("name").build())
+            .build();
 
     assertEqualsAndHashCodeAreFalse(fooWithOnlyValue, fooWithValueAndExtension);
   }
-  
+
   // Test to ensure we avoid a class cast exception with oneofs.
   public void testEquals_oneOfMessages() {
-    TestAllTypesLite mine = TestAllTypesLite.newBuilder()
-        .setOneofString("Hello")
-        .build();
-    
-    TestAllTypesLite other = TestAllTypesLite.newBuilder()
-        .setOneofNestedMessage(NestedMessage.getDefaultInstance())
-        .build();
-    
+    TestAllTypesLite mine = TestAllTypesLite.newBuilder().setOneofString("Hello").build();
+
+    TestAllTypesLite other =
+        TestAllTypesLite.newBuilder()
+            .setOneofNestedMessage(NestedMessage.getDefaultInstance())
+            .build();
+
     assertFalse(mine.equals(other));
     assertFalse(other.equals(mine));
   }
@@ -2270,4 +2105,277 @@ public class LiteTest extends TestCase {
     // This tests that we don't infinite loop.
     TestRecursiveOneof.getDefaultInstance().hashCode();
   }
+
+  public void testParseFromByteBuffer() throws Exception {
+    TestAllTypesLite message =
+        TestAllTypesLite.newBuilder()
+            .setOptionalInt32(123)
+            .addRepeatedString("hello")
+            .setOptionalNestedMessage(TestAllTypesLite.NestedMessage.newBuilder().setBb(7))
+            .build();
+
+    TestAllTypesLite copy =
+        TestAllTypesLite.parseFrom(message.toByteString().asReadOnlyByteBuffer());
+
+    assertEquals(message, copy);
+  }
+
+  public void testParseFromByteBufferThrows() {
+    try {
+      TestAllTypesLite.parseFrom(ByteBuffer.wrap(new byte[] {0x5}));
+      fail();
+    } catch (InvalidProtocolBufferException expected) {
+    }
+
+    TestAllTypesLite message =
+        TestAllTypesLite.newBuilder().setOptionalInt32(123).addRepeatedString("hello").build();
+
+    ByteBuffer buffer = ByteBuffer.wrap(message.toByteArray(), 0, message.getSerializedSize() - 1);
+    try {
+      TestAllTypesLite.parseFrom(buffer);
+      fail();
+    } catch (InvalidProtocolBufferException expected) {
+      assertEquals(
+          TestAllTypesLite.newBuilder().setOptionalInt32(123).build(),
+          expected.getUnfinishedMessage());
+    }
+  }
+
+  public void testParseFromByteBuffer_extensions() throws Exception {
+    TestAllExtensionsLite message =
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "hello")
+            .setExtension(
+                UnittestLite.optionalNestedEnumExtensionLite, TestAllTypesLite.NestedEnum.BAZ)
+            .setExtension(
+                UnittestLite.optionalNestedMessageExtensionLite,
+                TestAllTypesLite.NestedMessage.newBuilder().setBb(7).build())
+            .build();
+
+    ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
+    UnittestLite.registerAllExtensions(registry);
+
+    TestAllExtensionsLite copy =
+        TestAllExtensionsLite.parseFrom(message.toByteString().asReadOnlyByteBuffer(), registry);
+
+    assertEquals(message, copy);
+  }
+
+  public void testParseFromByteBufferThrows_extensions() {
+    ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
+    UnittestLite.registerAllExtensions(registry);
+    try {
+      TestAllExtensionsLite.parseFrom(ByteBuffer.wrap(new byte[] {0x5}), registry);
+      fail();
+    } catch (InvalidProtocolBufferException expected) {
+    }
+
+    TestAllExtensionsLite message =
+        TestAllExtensionsLite.newBuilder()
+            .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+            .addExtension(UnittestLite.repeatedStringExtensionLite, "hello")
+            .build();
+
+    ByteBuffer buffer = ByteBuffer.wrap(message.toByteArray(), 0, message.getSerializedSize() - 1);
+    try {
+      TestAllExtensionsLite.parseFrom(buffer, registry);
+      fail();
+    } catch (InvalidProtocolBufferException expected) {
+      assertEquals(
+          TestAllExtensionsLite.newBuilder()
+              .setExtension(UnittestLite.optionalInt32ExtensionLite, 123)
+              .build(),
+          expected.getUnfinishedMessage());
+    }
+  }
+
+  // Make sure we haven't screwed up the code generation for packing fields by default.
+  public void testPackedSerialization() throws Exception {
+    TestAllTypes.Builder builder = TestAllTypes.newBuilder();
+    builder.addRepeatedInt32(4321);
+    builder.addRepeatedNestedEnum(TestAllTypes.NestedEnum.BAZ);
+    TestAllTypes message = builder.build();
+
+    CodedInputStream in = CodedInputStream.newInstance(message.toByteArray());
+
+    while (!in.isAtEnd()) {
+      int tag = in.readTag();
+      assertEquals(WireFormat.WIRETYPE_LENGTH_DELIMITED, WireFormat.getTagWireType(tag));
+      in.skipField(tag);
+    }
+  }
+
+  public void testAddAllIteratesOnce() {
+    TestAllTypesLite.newBuilder()
+        .addAllRepeatedBool(new OneTimeIterableList(false))
+        .addAllRepeatedInt32(new OneTimeIterableList(0))
+        .addAllRepeatedInt64(new OneTimeIterableList(0L))
+        .addAllRepeatedFloat(new OneTimeIterableList(0f))
+        .addAllRepeatedDouble(new OneTimeIterableList(0d))
+        .addAllRepeatedBytes(new OneTimeIterableList(ByteString.EMPTY))
+        .addAllRepeatedString(new OneTimeIterableList(""))
+        .addAllRepeatedNestedMessage(new OneTimeIterableList(NestedMessage.getDefaultInstance()))
+        .addAllRepeatedBool(new OneTimeIterable(false))
+        .addAllRepeatedInt32(new OneTimeIterable(0))
+        .addAllRepeatedInt64(new OneTimeIterable(0L))
+        .addAllRepeatedFloat(new OneTimeIterable(0f))
+        .addAllRepeatedDouble(new OneTimeIterable(0d))
+        .addAllRepeatedBytes(new OneTimeIterable(ByteString.EMPTY))
+        .addAllRepeatedString(new OneTimeIterable(""))
+        .addAllRepeatedNestedMessage(new OneTimeIterable(NestedMessage.getDefaultInstance()))
+        .build();
+  }
+
+  public void testAddAllIteratesOnce_throwsOnNull() {
+    TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder();
+    try {
+      builder.addAllRepeatedBool(new OneTimeIterableList(true, false, (Boolean) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 2 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedBoolCount());
+    }
+
+    try {
+      builder.addAllRepeatedBool(new OneTimeIterable(true, false, (Boolean) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 2 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedBoolCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedBool(new OneTimeIterableList((Boolean) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedBoolCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedInt32(new OneTimeIterableList((Integer) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedInt32Count());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedInt64(new OneTimeIterableList((Long) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedInt64Count());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedFloat(new OneTimeIterableList((Float) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedFloatCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedDouble(new OneTimeIterableList((Double) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedDoubleCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedBytes(new OneTimeIterableList((ByteString) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedBytesCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedString(new OneTimeIterableList("", "", (String) null, ""));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 2 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedStringCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedString(new OneTimeIterable("", "", (String) null, ""));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 2 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedStringCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedString(new OneTimeIterableList((String) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedStringCount());
+    }
+
+    try {
+      builder = TestAllTypesLite.newBuilder();
+      builder.addAllRepeatedNestedMessage(new OneTimeIterableList((NestedMessage) null));
+      fail();
+    } catch (NullPointerException expected) {
+      assertEquals("Element at index 0 is null.", expected.getMessage());
+      assertEquals(0, builder.getRepeatedNestedMessageCount());
+    }
+  }
+
+  private static final class OneTimeIterableList<T> extends ArrayList<T> {
+    private boolean wasIterated = false;
+
+    OneTimeIterableList(T... contents) {
+      addAll(Arrays.asList(contents));
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+      if (wasIterated) {
+        fail();
+      }
+      wasIterated = true;
+      return super.iterator();
+    }
+  }
+
+  private static final class OneTimeIterable<T> implements Iterable<T> {
+    private final List<T> list;
+    private boolean wasIterated = false;
+
+    OneTimeIterable(T... contents) {
+      list = Arrays.asList(contents);
+    }
+
+    @Override
+    public Iterator<T> iterator() {
+      if (wasIterated) {
+        fail();
+      }
+      wasIterated = true;
+      return list.iterator();
+    }
+  }
+
+  public void testNullExtensionRegistry() throws Exception {
+    try {
+      TestAllTypesLite.parseFrom(new byte[] {}, null);
+      fail();
+    } catch (NullPointerException expected) {
+    }
+  }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java b/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java
index 6bbdfcaa..e50c7d1e 100644
--- a/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java
+++ b/java/core/src/test/java/com/google/protobuf/LongArrayListTest.java
@@ -32,6 +32,7 @@ package com.google.protobuf;
 
 import static java.util.Arrays.asList;
 
+import com.google.protobuf.Internal.LongList;
 import java.util.Collections;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -297,6 +298,20 @@ public class LongArrayListTest extends TestCase {
     }
   }
 
+  public void testRemoveEndOfCapacity() {
+    LongList toRemove = LongArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addLong(3);
+    toRemove.remove(0);
+    assertEquals(0, toRemove.size());
+  }
+
+  public void testSublistRemoveEndOfCapacity() {
+    LongList toRemove = LongArrayList.emptyList().mutableCopyWithCapacity(1);
+    toRemove.addLong(3);
+    toRemove.subList(0, 1).clear();
+    assertEquals(0, toRemove.size());
+  }
+
   private void assertImmutable(LongArrayList list) {
     if (list.contains(1L)) {
       throw new RuntimeException("Cannot test the immutability of lists that contain 1.");
diff --git a/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java b/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
index 0a14f584..da9195f9 100644
--- a/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MapForProto2LiteTest.java
@@ -408,12 +408,12 @@ public final class MapForProto2LiteTest extends TestCase {
     TestMap map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToInt32Field(5, bytes)
         .build());
-    assertEquals(map.getInt32ToInt32FieldOrDefault(5, -1), 0);
+    assertEquals(0, map.getInt32ToInt32FieldOrDefault(5, -1));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToStringField(stringKey, 5)
         .build());
-    assertEquals(map.getInt32ToStringFieldOrDefault(0, null), "");
+    assertEquals("", map.getInt32ToStringFieldOrDefault(0, null));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToBytesField(stringKey, 5)
@@ -423,7 +423,7 @@ public final class MapForProto2LiteTest extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToEnumField(stringKey, bytes)
         .build());
-    assertEquals(map.getInt32ToEnumFieldOrDefault(0, null), TestMap.EnumValue.FOO);
+    assertEquals(TestMap.EnumValue.FOO, map.getInt32ToEnumFieldOrDefault(0, null));
 
     try {
       tryParseTestMap(BizarroTestMap.newBuilder()
@@ -439,7 +439,7 @@ public final class MapForProto2LiteTest extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putStringToInt32Field(stringKey, bytes)
         .build());
-    assertEquals(map.getStringToInt32FieldOrDefault(stringKey, -1), 0);
+    assertEquals(0, map.getStringToInt32FieldOrDefault(stringKey, -1));
   }
 
   public void testMergeFrom() throws Exception {
diff --git a/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java b/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java
index cfe4c453..bcfd927c 100644
--- a/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java
+++ b/java/core/src/test/java/com/google/protobuf/MapForProto2Test.java
@@ -546,12 +546,12 @@ public class MapForProto2Test extends TestCase {
     TestMap map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToInt32Field(5, bytes)
         .build());
-    assertEquals(map.getInt32ToInt32FieldOrDefault(5, -1), 0);
+    assertEquals(0, map.getInt32ToInt32FieldOrDefault(5, -1));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToStringField(stringKey, 5)
         .build());
-    assertEquals(map.getInt32ToStringFieldOrDefault(0, null), "");
+    assertEquals("", map.getInt32ToStringFieldOrDefault(0, null));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToBytesField(stringKey, 5)
@@ -561,7 +561,7 @@ public class MapForProto2Test extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToEnumField(stringKey, bytes)
         .build());
-    assertEquals(map.getInt32ToEnumFieldOrDefault(0, null), TestMap.EnumValue.FOO);
+    assertEquals(TestMap.EnumValue.FOO, map.getInt32ToEnumFieldOrDefault(0, null));
 
     try {
       tryParseTestMap(BizarroTestMap.newBuilder()
@@ -577,7 +577,7 @@ public class MapForProto2Test extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putStringToInt32Field(stringKey, bytes)
         .build());
-    assertEquals(map.getStringToInt32FieldOrDefault(stringKey, -1), 0);
+    assertEquals(0, map.getStringToInt32FieldOrDefault(stringKey, -1));
   }
 
   public void testMergeFrom() throws Exception {
@@ -759,6 +759,7 @@ public class MapForProto2Test extends TestCase {
     assertEquals(55, message.getInt32ToInt32Field().get(55).intValue());
   }
 
+  // See additional coverage in TextFormatTest.java.
   public void testTextFormat() throws Exception {
     TestMap.Builder builder = TestMap.newBuilder();
     setMapValuesUsingAccessors(builder);
@@ -787,6 +788,24 @@ public class MapForProto2Test extends TestCase {
     assertEquals(message.hashCode(), dynamicMessage.hashCode());
   }
 
+  // Check that DynamicMessage handles map field serialization the same way as generated code
+  // regarding unset key and value field in a map entry.
+  public void testDynamicMessageUnsetKeyAndValue() throws Exception {
+    FieldDescriptor field = f("int32_to_int32_field");
+
+    Message dynamicDefaultInstance =
+        DynamicMessage.getDefaultInstance(TestMap.getDescriptor());
+    Message.Builder builder = dynamicDefaultInstance.newBuilderForType();
+    // Add an entry without key and value.
+    builder.addRepeatedField(field, builder.newBuilderForField(field).build());
+    Message message = builder.build();
+    ByteString bytes = message.toByteString();
+    // Parse it back to the same generated type.
+    Message generatedMessage = TestMap.parseFrom(bytes);
+    // Assert the serialized bytes are equivalent.
+    assertEquals(generatedMessage.toByteString(), bytes);
+  }
+
   public void testReflectionEqualsAndHashCode() throws Exception {
     // Test that generated equals() and hashCode() will disregard the order
     // of map entries when comparing/hashing map fields.
diff --git a/java/core/src/test/java/com/google/protobuf/MapTest.java b/java/core/src/test/java/com/google/protobuf/MapTest.java
index 81e951cc..58efce92 100644
--- a/java/core/src/test/java/com/google/protobuf/MapTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MapTest.java
@@ -30,7 +30,7 @@
 
 package com.google.protobuf;
 
-
+import static org.junit.Assert.assertArrayEquals;
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.EnumDescriptor;
 import com.google.protobuf.Descriptors.EnumValueDescriptor;
@@ -490,19 +490,13 @@ public class MapTest extends TestCase {
   public void testPutForUnknownEnumValues() throws Exception {
     TestMap.Builder builder = TestMap.newBuilder()
         .putInt32ToEnumFieldValue(0, 0)
-        .putInt32ToEnumFieldValue(1, 1);
-
-    try {
-      builder.putInt32ToEnumFieldValue(2, 1000);  // unknown value.
-      fail();
-    } catch (IllegalArgumentException e) {
-      // expected
-    }
-
+        .putInt32ToEnumFieldValue(1, 1)
+        .putInt32ToEnumFieldValue(2, 1000);  // unknown value.
     TestMap message = builder.build();
     assertEquals(0, message.getInt32ToEnumFieldValueOrThrow(0));
     assertEquals(1, message.getInt32ToEnumFieldValueOrThrow(1));
-    assertEquals(2, message.getInt32ToEnumFieldCount());
+    assertEquals(1000, message.getInt32ToEnumFieldValueOrThrow(2));
+    assertEquals(3, message.getInt32ToEnumFieldCount());
   }
 
   public void testPutChecksNullKeysAndValues() throws Exception {
@@ -582,12 +576,12 @@ public class MapTest extends TestCase {
     TestMap map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToInt32Field(5, bytes)
         .build());
-    assertEquals(map.getInt32ToInt32FieldOrDefault(5, -1), 0);
+    assertEquals(0, map.getInt32ToInt32FieldOrDefault(5, -1));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToStringField(stringKey, 5)
         .build());
-    assertEquals(map.getInt32ToStringFieldOrDefault(0, null), "");
+    assertEquals("", map.getInt32ToStringFieldOrDefault(0, null));
 
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToBytesField(stringKey, 5)
@@ -597,7 +591,7 @@ public class MapTest extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putInt32ToEnumField(stringKey, bytes)
         .build());
-    assertEquals(map.getInt32ToEnumFieldOrDefault(0, null), TestMap.EnumValue.FOO);
+    assertEquals(TestMap.EnumValue.FOO, map.getInt32ToEnumFieldOrDefault(0, null));
 
     try {
       tryParseTestMap(BizarroTestMap.newBuilder()
@@ -613,7 +607,7 @@ public class MapTest extends TestCase {
     map = tryParseTestMap(BizarroTestMap.newBuilder()
         .putStringToInt32Field(stringKey, bytes)
         .build());
-    assertEquals(map.getStringToInt32FieldOrDefault(stringKey, -1), 0);
+    assertEquals(0, map.getStringToInt32FieldOrDefault(stringKey, -1));
   }
 
   public void testMergeFrom() throws Exception {
@@ -870,6 +864,7 @@ public class MapTest extends TestCase {
     assertEquals(55, message.getInt32ToInt32Field().get(55).intValue());
   }
 
+  // See additional coverage in TextFormatTest.java.
   public void testTextFormat() throws Exception {
     TestMap.Builder builder = TestMap.newBuilder();
     setMapValuesUsingAccessors(builder);
@@ -898,6 +893,24 @@ public class MapTest extends TestCase {
     assertEquals(message.hashCode(), dynamicMessage.hashCode());
   }
 
+  // Check that DynamicMessage handles map field serialization the same way as generated code
+  // regarding unset key and value field in a map entry.
+  public void testDynamicMessageUnsetKeyAndValue() throws Exception {
+    FieldDescriptor field = f("int32_to_int32_field");
+
+    Message dynamicDefaultInstance =
+        DynamicMessage.getDefaultInstance(TestMap.getDescriptor());
+    Message.Builder builder = dynamicDefaultInstance.newBuilderForType();
+    // Add an entry without key and value.
+    builder.addRepeatedField(field, builder.newBuilderForField(field).build());
+    Message message = builder.build();
+    ByteString bytes = message.toByteString();
+    // Parse it back to the same generated type.
+    Message generatedMessage = TestMap.parseFrom(bytes);
+    // Assert the serialized bytes are equivalent.
+    assertEquals(generatedMessage.toByteString(), bytes);
+  }
+
   public void testReflectionEqualsAndHashCode() throws Exception {
     // Test that generated equals() and hashCode() will disregard the order
     // of map entries when comparing/hashing map fields.
@@ -1250,12 +1263,9 @@ public class MapTest extends TestCase {
     builder.putInt32ToEnumFieldValue(1, TestMap.EnumValue.BAR.getNumber());
     assertEquals(
         TestMap.EnumValue.BAR.getNumber(), builder.getInt32ToEnumFieldValueOrThrow(1));
-    try {
-      builder.putInt32ToEnumFieldValue(1, -1);
-      fail();
-    } catch (IllegalArgumentException e) {
-      // expected
-    }
+    builder.putInt32ToEnumFieldValue(1, -1);
+    assertEquals(-1, builder.getInt32ToEnumFieldValueOrThrow(1));
+    assertEquals(TestMap.EnumValue.UNRECOGNIZED, builder.getInt32ToEnumFieldOrThrow(1));
 
     builder.putStringToInt32Field("a", 1);
     assertEquals(1, builder.getStringToInt32FieldOrThrow("a"));
@@ -1492,4 +1502,41 @@ public class MapTest extends TestCase {
     map.put(key3, value3);
     return map;
   }
+
+  public void testMap_withNulls() {
+    TestMap.Builder builder = TestMap.newBuilder();
+
+    try {
+      builder.putStringToInt32Field(null, 3);
+      fail();
+    } catch (NullPointerException expected) {
+    }
+
+    try {
+      builder.putAllStringToInt32Field(newMap(null, 3, "hi", 4));
+      fail();
+    } catch (NullPointerException expected) {
+    }
+
+    try {
+      builder.putInt32ToMessageField(3, null);
+      fail();
+    } catch (NullPointerException expected) {
+    }
+
+    try {
+      builder.putAllInt32ToMessageField(
+          MapTest.<Integer, MessageValue>newMap(4, null, 5, null));
+      fail();
+    } catch (NullPointerException expected) {
+    }
+
+    try {
+      builder.putAllInt32ToMessageField(null);
+      fail();
+    } catch (NullPointerException expected) {
+    }
+
+    assertArrayEquals(new byte[0], builder.build().toByteArray());
+  }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/MessageTest.java b/java/core/src/test/java/com/google/protobuf/MessageTest.java
index 75b79a34..4fc8f78e 100644
--- a/java/core/src/test/java/com/google/protobuf/MessageTest.java
+++ b/java/core/src/test/java/com/google/protobuf/MessageTest.java
@@ -74,6 +74,14 @@ public class MessageTest extends TestCase {
       "repeated_string: \"qux\"\n" +
       "repeated_string: \"bar\"\n";
 
+  public void testParsingWithNullExtensionRegistry() throws Exception {
+    try {
+      TestAllTypes.parseFrom(new byte[] {}, null);
+      fail();
+    } catch (NullPointerException expected) {
+    }
+  }
+
   public void testMergeFrom() throws Exception {
     TestAllTypes result =
       TestAllTypes.newBuilder(MERGE_DEST)
@@ -321,8 +329,10 @@ public class MessageTest extends TestCase {
 
     assertTrue(result.getField(result.getDescriptorForType()
         .findFieldByName("repeated_foreign_message")) instanceof List<?>);
-    assertEquals(result.getRepeatedFieldCount(result.getDescriptorForType()
-        .findFieldByName("repeated_foreign_message")), 0);
+    assertEquals(
+        0,
+        result.getRepeatedFieldCount(
+            result.getDescriptorForType().findFieldByName("repeated_foreign_message")));
   }
   
   /** Test reading repeated message from DynamicMessage. */
@@ -345,7 +355,9 @@ public class MessageTest extends TestCase {
 
     assertTrue(result.getField(result.getDescriptorForType()
         .findFieldByName("repeated_foreign_message")) instanceof List<?>);
-    assertEquals(result.getRepeatedFieldCount(result.getDescriptorForType()
-        .findFieldByName("repeated_foreign_message")), 2);
+    assertEquals(
+        2,
+        result.getRepeatedFieldCount(
+            result.getDescriptorForType().findFieldByName("repeated_foreign_message")));
   }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/ParserTest.java b/java/core/src/test/java/com/google/protobuf/ParserTest.java
index 8c2e4c26..1e891112 100644
--- a/java/core/src/test/java/com/google/protobuf/ParserTest.java
+++ b/java/core/src/test/java/com/google/protobuf/ParserTest.java
@@ -30,9 +30,6 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.UnittestLite.TestAllTypesLite;
-import com.google.protobuf.UnittestLite.TestPackedExtensionsLite;
-import com.google.protobuf.UnittestLite.TestParsingMergeLite;
 import protobuf_unittest.UnittestOptimizeFor;
 import protobuf_unittest.UnittestOptimizeFor.TestOptimizedForSize;
 import protobuf_unittest.UnittestOptimizeFor.TestRequiredOptimizedForSize;
@@ -79,6 +76,8 @@ public class ParserTest extends TestCase {
         new ByteArrayInputStream(data), registry));
     assertMessageEquals(message, parser.parseFrom(
         CodedInputStream.newInstance(data), registry));
+    assertMessageEquals(
+        message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer(), registry));
   }
 
   @SuppressWarnings("unchecked")
@@ -99,6 +98,7 @@ public class ParserTest extends TestCase {
         new ByteArrayInputStream(data)));
     assertMessageEquals(message, parser.parseFrom(
         CodedInputStream.newInstance(data)));
+    assertMessageEquals(message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer()));
   }
 
   private void assertMessageEquals(
@@ -178,16 +178,12 @@ public class ParserTest extends TestCase {
   public void testParseExtensions() throws Exception {
     assertRoundTripEquals(TestUtil.getAllExtensionsSet(),
                           TestUtil.getExtensionRegistry());
-    assertRoundTripEquals(
-        TestUtilLite.getAllLiteExtensionsSet(), TestUtilLite.getExtensionRegistryLite());
   }
 
   public void testParsePacked() throws Exception {
     assertRoundTripEquals(TestUtil.getPackedSet());
     assertRoundTripEquals(TestUtil.getPackedExtensionsSet(),
                           TestUtil.getExtensionRegistry());
-    assertRoundTripEquals(
-        TestUtilLite.getLitePackedExtensionsSet(), TestUtilLite.getExtensionRegistryLite());
   }
 
   public void testParseDelimitedTo() throws Exception {
@@ -195,20 +191,11 @@ public class ParserTest extends TestCase {
     TestAllTypes normalMessage = TestUtil.getAllSet();
     ByteArrayOutputStream output = new ByteArrayOutputStream();
     normalMessage.writeDelimitedTo(output);
-
-    // Write MessageLite with packed extension fields.
-    TestPackedExtensionsLite packedMessage = TestUtilLite.getLitePackedExtensionsSet();
-    packedMessage.writeDelimitedTo(output);
+    normalMessage.writeDelimitedTo(output);
 
     InputStream input = new ByteArrayInputStream(output.toByteArray());
-    assertMessageEquals(
-        normalMessage,
-        normalMessage.getParserForType().parseDelimitedFrom(input));
-    assertMessageEquals(
-        packedMessage,
-        packedMessage
-            .getParserForType()
-            .parseDelimitedFrom(input, TestUtilLite.getExtensionRegistryLite()));
+    assertMessageEquals(normalMessage, normalMessage.getParserForType().parseDelimitedFrom(input));
+    assertMessageEquals(normalMessage, normalMessage.getParserForType().parseDelimitedFrom(input));
   }
 
   public void testParseUnknownFields() throws Exception {
@@ -243,14 +230,6 @@ public class ParserTest extends TestCase {
     assertEquals("hello", allTypes.getOptionalString());
   }
 
-  /** Helper method for {@link #testParsingMergeLite()}.*/
-  private void assertMessageMerged(TestAllTypesLite allTypes)
-      throws Exception {
-    assertEquals(3, allTypes.getOptionalInt32());
-    assertEquals(2, allTypes.getOptionalInt64());
-    assertEquals("hello", allTypes.getOptionalString());
-  }
-
   public void testParsingMerge() throws Exception {
     // Build messages.
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
@@ -312,68 +291,6 @@ public class ParserTest extends TestCase {
         TestParsingMerge.repeatedExt));
   }
 
-  public void testParsingMergeLite() throws Exception {
-    // Build messages.
-    TestAllTypesLite.Builder builder =
-        TestAllTypesLite.newBuilder();
-    TestAllTypesLite msg1 = builder.setOptionalInt32(1).build();
-    builder.clear();
-    TestAllTypesLite msg2 = builder.setOptionalInt64(2).build();
-    builder.clear();
-    TestAllTypesLite msg3 = builder.setOptionalInt32(3)
-        .setOptionalString("hello").build();
-
-    // Build groups.
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG1 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder()
-        .setField1(msg1).build();
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG2 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder()
-        .setField1(msg2).build();
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG3 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder()
-        .setField1(msg3).build();
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG1 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder()
-        .setField1(msg1).build();
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG2 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder()
-        .setField1(msg2).build();
-    TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG3 =
-        TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder()
-        .setField1(msg3).build();
-
-    // Assign and serialize RepeatedFieldsGenerator.
-    ByteString data = TestParsingMergeLite.RepeatedFieldsGenerator.newBuilder()
-        .addField1(msg1).addField1(msg2).addField1(msg3)
-        .addField2(msg1).addField2(msg2).addField2(msg3)
-        .addField3(msg1).addField3(msg2).addField3(msg3)
-        .addGroup1(optionalG1).addGroup1(optionalG2).addGroup1(optionalG3)
-        .addGroup2(repeatedG1).addGroup2(repeatedG2).addGroup2(repeatedG3)
-        .addExt1(msg1).addExt1(msg2).addExt1(msg3)
-        .addExt2(msg1).addExt2(msg2).addExt2(msg3)
-        .build().toByteString();
-
-    // Parse TestParsingMergeLite.
-    ExtensionRegistry registry = ExtensionRegistry.newInstance();
-    UnittestLite.registerAllExtensions(registry);
-    TestParsingMergeLite parsingMerge = TestParsingMergeLite.parser().parseFrom(data, registry);
-
-    // Required and optional fields should be merged.
-    assertMessageMerged(parsingMerge.getRequiredAllTypes());
-    assertMessageMerged(parsingMerge.getOptionalAllTypes());
-    assertMessageMerged(
-        parsingMerge.getOptionalGroup().getOptionalGroupAllTypes());
-    assertMessageMerged(parsingMerge.getExtension(
-        TestParsingMergeLite.optionalExt));
-
-    // Repeated fields should not be merged.
-    assertEquals(3, parsingMerge.getRepeatedAllTypesCount());
-    assertEquals(3, parsingMerge.getRepeatedGroupCount());
-    assertEquals(3, parsingMerge.getExtensionCount(
-        TestParsingMergeLite.repeatedExt));
-  }
-
   public void testParseDelimitedFrom_firstByteInterrupted_preservesCause() {
     try {
       TestUtil.getAllSet().parseDelimitedFrom(
diff --git a/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java
index 2c60fe0e..4af55429 100644
--- a/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java
+++ b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiers.java
@@ -92,5 +92,31 @@ public class TestBadIdentifiers extends TestCase {
     assertEquals(0L, message.getExtension(
         TestBadIdentifiersProto.TestConflictingFieldNames.int64FieldList).longValue());
 
+    assertEquals("", message.getFieldName32());
+    assertEquals("", message.getFieldName33());
+    assertEquals(0, message.get2Conflict34());
+    assertEquals(0, message.get2Conflict35());
+
+  }
+
+  public void testNumberFields() throws Exception {
+    TestBadIdentifiersProto.TestLeadingNumberFields message =
+        TestBadIdentifiersProto.TestLeadingNumberFields.getDefaultInstance();
+    // Make sure generated accessors are properly named.
+    assertFalse(message.has30DayImpressions());
+    assertEquals(0, message.get30DayImpressions());
+    assertEquals(0, message.get60DayImpressionsCount());
+    assertEquals(0, message.get60DayImpressionsList().size());
+
+    assertFalse(message.has2Underscores());
+    assertEquals("", message.get2Underscores());
+    assertEquals(0, message.get2RepeatedUnderscoresCount());
+    assertEquals(0, message.get2RepeatedUnderscoresList().size());
+
+    assertFalse(message.has32());
+    assertEquals(0, message.get32());
+    assertEquals(0, message.get64Count());
+    assertEquals(0, message.get64List().size());
+
   }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/TestBadIdentifiersLite.java b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiersLite.java
new file mode 100644
index 00000000..37f94c03
--- /dev/null
+++ b/java/core/src/test/java/com/google/protobuf/TestBadIdentifiersLite.java
@@ -0,0 +1,83 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import junit.framework.TestCase;
+
+/**
+ * Tests that proto2 api generation doesn't cause compile errors when compiling protocol buffers
+ * that have names that would otherwise conflict if not fully qualified (like @Deprecated
+ * and @Override).
+ *
+ * <p>Forked from {@link TestBadIdentifiers}.
+ *
+ * @author jonp@google.com (Jon Perlow)
+ */
+public final class TestBadIdentifiersLite extends TestCase {
+
+  public void testCompilation() {
+    // If this compiles, it means the generation was correct.
+    TestBadIdentifiersProto.Deprecated.newBuilder();
+    TestBadIdentifiersProto.Override.newBuilder();
+  }
+
+  public void testConflictingFieldNames() throws Exception {
+    TestBadIdentifiersProto.TestConflictingFieldNames message =
+        TestBadIdentifiersProto.TestConflictingFieldNames.getDefaultInstance();
+    // Make sure generated accessors are properly named.
+    assertEquals(0, message.getInt32Field1Count());
+    assertEquals(0, message.getEnumField2Count());
+    assertEquals(0, message.getStringField3Count());
+    assertEquals(0, message.getBytesField4Count());
+    assertEquals(0, message.getMessageField5Count());
+
+    assertEquals(0, message.getInt32FieldCount11());
+    assertEquals(0, message.getEnumFieldCount12().getNumber());
+    assertEquals("", message.getStringFieldCount13());
+    assertEquals(ByteString.EMPTY, message.getBytesFieldCount14());
+    assertEquals(0, message.getMessageFieldCount15().getSerializedSize());
+
+    assertEquals(0, message.getInt32Field21Count());
+    assertEquals(0, message.getEnumField22Count());
+    assertEquals(0, message.getStringField23Count());
+    assertEquals(0, message.getBytesField24Count());
+    assertEquals(0, message.getMessageField25Count());
+
+    assertEquals(0, message.getInt32Field1List().size());
+    assertEquals(0, message.getInt32FieldList31());
+
+    assertEquals(0, message.getInt64FieldCount());
+    assertEquals(0L, message.getExtension(
+        TestBadIdentifiersProto.TestConflictingFieldNames.int64FieldCount).longValue());
+    assertEquals(0L, message.getExtension(
+        TestBadIdentifiersProto.TestConflictingFieldNames.int64FieldList).longValue());
+  }
+}
diff --git a/java/core/src/test/java/com/google/protobuf/TestUtil.java b/java/core/src/test/java/com/google/protobuf/TestUtil.java
index d4a18a22..b4bc3a3d 100644
--- a/java/core/src/test/java/com/google/protobuf/TestUtil.java
+++ b/java/core/src/test/java/com/google/protobuf/TestUtil.java
@@ -231,6 +231,7 @@ import protobuf_unittest.UnittestProto.TestAllTypesOrBuilder;
 import protobuf_unittest.UnittestProto.TestOneof2;
 import protobuf_unittest.UnittestProto.TestPackedExtensions;
 import protobuf_unittest.UnittestProto.TestPackedTypes;
+import protobuf_unittest.UnittestProto.TestRequired;
 import protobuf_unittest.UnittestProto.TestUnpackedTypes;
 import java.io.File;
 import java.io.IOException;
@@ -252,6 +253,11 @@ import junit.framework.Assert;
 public final class TestUtil {
   private TestUtil() {}
 
+  public static final TestRequired TEST_REQUIRED_UNINITIALIZED =
+      TestRequired.newBuilder().setA(1).buildPartial();
+  public static final TestRequired TEST_REQUIRED_INITIALIZED =
+      TestRequired.newBuilder().setA(1).setB(2).setC(3).build();
+
   /** Helper to convert a String to ByteString. */
   static ByteString toBytes(String str) {
     return ByteString.copyFrom(str.getBytes(Internal.UTF_8));
@@ -2602,6 +2608,9 @@ public final class TestUtil {
       case FOO_CORD:
         Assert.assertTrue(message.hasFooCord());
         break;
+      case FOO_STRING_PIECE:
+        Assert.assertTrue(message.hasFooStringPiece());
+        break;
       case FOO_BYTES:
         Assert.assertTrue(message.hasFooBytes());
         break;
@@ -2619,6 +2628,8 @@ public final class TestUtil {
         break;
       case FOO_NOT_SET:
         break;
+      default:
+        // TODO(b/18683919): go/enum-switch-lsc
     }
   }
 
diff --git a/java/core/src/test/java/com/google/protobuf/TextFormatTest.java b/java/core/src/test/java/com/google/protobuf/TextFormatTest.java
index 6a91b02f..720061d2 100644
--- a/java/core/src/test/java/com/google/protobuf/TextFormatTest.java
+++ b/java/core/src/test/java/com/google/protobuf/TextFormatTest.java
@@ -30,9 +30,13 @@
 
 package com.google.protobuf;
 
+import static com.google.protobuf.TestUtil.TEST_REQUIRED_INITIALIZED;
+import static com.google.protobuf.TestUtil.TEST_REQUIRED_UNINITIALIZED;
+
 import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
 import com.google.protobuf.TextFormat.Parser.SingularOverwritePolicy;
+import map_test.MapTestProto.TestMap;
 import protobuf_unittest.UnittestMset.TestMessageSetExtension1;
 import protobuf_unittest.UnittestMset.TestMessageSetExtension2;
 import protobuf_unittest.UnittestProto.OneString;
@@ -41,6 +45,7 @@ import protobuf_unittest.UnittestProto.TestAllTypes;
 import protobuf_unittest.UnittestProto.TestAllTypes.NestedMessage;
 import protobuf_unittest.UnittestProto.TestEmptyMessage;
 import protobuf_unittest.UnittestProto.TestOneof2;
+import protobuf_unittest.UnittestProto.TestRequired;
 import proto2_wireformat_unittest.UnittestMsetWireFormat.TestMessageSet;
 import java.io.StringReader;
 import java.util.List;
@@ -56,12 +61,11 @@ import junit.framework.TestCase;
 public class TextFormatTest extends TestCase {
 
   // A basic string with different escapable characters for testing.
-  private final static String kEscapeTestString =
-      "\"A string with ' characters \n and \r newlines and \t tabs and \001 "
-          + "slashes \\";
+  private static final String ESCAPE_TEST_STRING =
+      "\"A string with ' characters \n and \r newlines and \t tabs and \001 " + "slashes \\";
 
   // A representation of the above string with all the characters escaped.
-  private final static String kEscapeTestStringEscaped =
+  private static final String ESCAPE_TEST_STRING_ESCAPED =
       "\\\"A string with \\' characters \\n and \\r newlines "
           + "and \\t tabs and \\001 slashes \\\\";
 
@@ -167,6 +171,7 @@ public class TextFormatTest extends TestCase {
 
   // Creates an example unknown field set.
   private UnknownFieldSet makeUnknownFieldSet() {
+
     return UnknownFieldSet.newBuilder()
         .addField(5,
             UnknownFieldSet.Field.newBuilder()
@@ -174,6 +179,12 @@ public class TextFormatTest extends TestCase {
             .addFixed32(2)
             .addFixed64(3)
             .addLengthDelimited(ByteString.copyFromUtf8("4"))
+            .addLengthDelimited(UnknownFieldSet.newBuilder()
+                .addField(12,
+                    UnknownFieldSet.Field.newBuilder()
+                        .addVarint(6)
+                        .build())
+                .build().toByteString())
             .addGroup(
                 UnknownFieldSet.newBuilder()
                 .addField(10,
@@ -206,20 +217,23 @@ public class TextFormatTest extends TestCase {
         .build();
 
     assertEquals(
-      "5: 1\n" +
-      "5: 0x00000002\n" +
-      "5: 0x0000000000000003\n" +
-      "5: \"4\"\n" +
-      "5 {\n" +
-      "  10: 5\n" +
-      "}\n" +
-      "8: 1\n" +
-      "8: 2\n" +
-      "8: 3\n" +
-      "15: 12379813812177893520\n" +
-      "15: 0xabcd1234\n" +
-      "15: 0xabcdef1234567890\n",
-      TextFormat.printToString(message));
+        "5: 1\n"
+            + "5: 0x00000002\n"
+            + "5: 0x0000000000000003\n"
+            + "5: \"4\"\n"
+            + "5: {\n"
+            + "  12: 6\n"
+            + "}\n"
+            + "5 {\n"
+            + "  10: 5\n"
+            + "}\n"
+            + "8: 1\n"
+            + "8: 2\n"
+            + "8: 3\n"
+            + "15: 12379813812177893520\n"
+            + "15: 0xabcd1234\n"
+            + "15: 0xabcdef1234567890\n",
+        TextFormat.printToString(message));
   }
 
   public void testPrintField() throws Exception {
@@ -315,19 +329,58 @@ public class TextFormatTest extends TestCase {
 
   // =================================================================
 
-  public void testParse() throws Exception {
+  public void testMerge() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge(allFieldsSetText, builder);
     TestUtil.assertAllFieldsSet(builder.build());
   }
 
-  public void testParseReader() throws Exception {
+  public void testParse() throws Exception {
+    TestUtil.assertAllFieldsSet(
+        TextFormat.parse(allFieldsSetText, TestAllTypes.class));
+  }
+
+  public void testMergeInitialized() throws Exception {
+    TestRequired.Builder builder = TestRequired.newBuilder();
+    TextFormat.merge(TEST_REQUIRED_INITIALIZED.toString(), builder);
+    assertEquals(TEST_REQUIRED_INITIALIZED.toString(),
+                 builder.buildPartial().toString());
+    assertTrue(builder.isInitialized());
+  }
+
+  public void testParseInitialized() throws Exception {
+    TestRequired parsed =
+        TextFormat.parse(TEST_REQUIRED_INITIALIZED.toString(),
+                         TestRequired.class);
+    assertEquals(TEST_REQUIRED_INITIALIZED.toString(), parsed.toString());
+    assertTrue(parsed.isInitialized());
+  }
+
+  public void testMergeUninitialized() throws Exception {
+    TestRequired.Builder builder = TestRequired.newBuilder();
+    TextFormat.merge(TEST_REQUIRED_UNINITIALIZED.toString(), builder);
+    assertEquals(TEST_REQUIRED_UNINITIALIZED.toString(),
+                 builder.buildPartial().toString());
+    assertFalse(builder.isInitialized());
+  }
+
+  public void testParseUninitialized() throws Exception {
+    try {
+      TextFormat.parse(TEST_REQUIRED_UNINITIALIZED.toString(),
+                       TestRequired.class);
+      fail("Expected UninitializedMessageException.");
+    } catch (UninitializedMessageException e) {
+      assertEquals("Message missing required fields: b, c", e.getMessage());
+    }
+  }
+
+  public void testMergeReader() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge(new StringReader(allFieldsSetText), builder);
     TestUtil.assertAllFieldsSet(builder.build());
   }
 
-  public void testParseExtensions() throws Exception {
+  public void testMergeExtensions() throws Exception {
     TestAllExtensions.Builder builder = TestAllExtensions.newBuilder();
     TextFormat.merge(allExtensionsSetText,
                      TestUtil.getExtensionRegistry(),
@@ -335,7 +388,14 @@ public class TextFormatTest extends TestCase {
     TestUtil.assertAllExtensionsSet(builder.build());
   }
 
-  public void testParseCompatibility() throws Exception {
+  public void testParseExtensions() throws Exception {
+    TestUtil.assertAllExtensionsSet(
+        TextFormat.parse(allExtensionsSetText,
+                         TestUtil.getExtensionRegistry(),
+                         TestAllExtensions.class));
+  }
+
+  public void testMergeAndParseCompatibility() throws Exception {
     String original = "repeated_float: inf\n" +
                       "repeated_float: -inf\n" +
                       "repeated_float: nan\n" +
@@ -360,21 +420,29 @@ public class TextFormatTest extends TestCase {
                         "repeated_double: Infinity\n" +
                         "repeated_double: -Infinity\n" +
                         "repeated_double: NaN\n";
+
+    // Test merge().
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge(original, builder);
     assertEquals(canonical, builder.build().toString());
+
+    // Test parse().
+    assertEquals(canonical,
+                 TextFormat.parse(original, TestAllTypes.class).toString());
   }
 
-  public void testParseExotic() throws Exception {
+  public void testMergeAndParseExotic() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge(exoticText, builder);
 
     // Too lazy to check things individually.  Don't try to debug this
     // if testPrintExotic() is failing.
     assertEquals(canonicalExoticText, builder.build().toString());
+    assertEquals(canonicalExoticText,
+                 TextFormat.parse(exoticText, TestAllTypes.class).toString());
   }
 
-  public void testParseMessageSet() throws Exception {
+  public void testMergeMessageSet() throws Exception {
     ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
     extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);
     extensionRegistry.add(TestMessageSetExtension2.messageSetExtension);
@@ -400,7 +468,7 @@ public class TextFormatTest extends TestCase {
       TestMessageSetExtension1.messageSetExtension).getI());
   }
 
-  public void testParseMessageSetWithOverwriteForbidden() throws Exception {
+  public void testMergeMessageSetWithOverwriteForbidden() throws Exception {
     ExtensionRegistry extensionRegistry = ExtensionRegistry.newInstance();
     extensionRegistry.add(TestMessageSetExtension1.messageSetExtension);
     extensionRegistry.add(TestMessageSetExtension2.messageSetExtension);
@@ -427,20 +495,20 @@ public class TextFormatTest extends TestCase {
     }
   }
 
-  public void testParseNumericEnum() throws Exception {
+  public void testMergeNumericEnum() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge("optional_nested_enum: 2", builder);
     assertEquals(TestAllTypes.NestedEnum.BAR, builder.getOptionalNestedEnum());
   }
 
-  public void testParseAngleBrackets() throws Exception {
+  public void testMergeAngleBrackets() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge("OptionalGroup: < a: 1 >", builder);
     assertTrue(builder.hasOptionalGroup());
     assertEquals(1, builder.getOptionalGroup().getA());
   }
 
-  public void testParseComment() throws Exception {
+  public void testMergeComment() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     TextFormat.merge(
       "# this is a comment\n" +
@@ -452,6 +520,7 @@ public class TextFormatTest extends TestCase {
   }
 
   private void assertParseError(String error, String text) {
+    // Test merge().
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     try {
       TextFormat.merge(text, TestUtil.getExtensionRegistry(), builder);
@@ -459,6 +528,15 @@ public class TextFormatTest extends TestCase {
     } catch (TextFormat.ParseException e) {
       assertEquals(error, e.getMessage());
     }
+
+    // Test parse().
+    try {
+      TextFormat.parse(
+          text, TestUtil.getExtensionRegistry(), TestAllTypes.class);
+      fail("Expected parse exception.");
+    } catch (TextFormat.ParseException e) {
+      assertEquals(error, e.getMessage());
+    }
   }
 
 
@@ -497,10 +575,10 @@ public class TextFormatTest extends TestCase {
         "integer: 82301481290849012385230157",
       "optional_int32: 82301481290849012385230157");
     assertParseError(
-      "1:16: Expected \"true\" or \"false\".",
+      "1:16: Expected \"true\" or \"false\". Found \"maybe\".",
       "optional_bool: maybe");
     assertParseError(
-      "1:16: Expected \"true\" or \"false\".",
+      "1:16: Expected \"true\" or \"false\". Found \"2\".",
       "optional_bool: 2");
     assertParseError(
       "1:18: Expected string.",
@@ -564,10 +642,8 @@ public class TextFormatTest extends TestCase {
       TextFormat.unescapeBytes("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\""));
     assertEquals("\0\001\007\b\f\n\r\t\013\\\'\"",
       TextFormat.unescapeText("\\000\\001\\a\\b\\f\\n\\r\\t\\v\\\\\\'\\\""));
-    assertEquals(kEscapeTestStringEscaped,
-      TextFormat.escapeText(kEscapeTestString));
-    assertEquals(kEscapeTestString,
-      TextFormat.unescapeText(kEscapeTestStringEscaped));
+    assertEquals(ESCAPE_TEST_STRING_ESCAPED, TextFormat.escapeText(ESCAPE_TEST_STRING));
+    assertEquals(ESCAPE_TEST_STRING, TextFormat.unescapeText(ESCAPE_TEST_STRING_ESCAPED));
 
     // Invariant
     assertEquals("hello",
@@ -860,7 +936,7 @@ public class TextFormatTest extends TestCase {
   }
 
   public void testShortDebugString_unknown() {
-    assertEquals("5: 1 5: 0x00000002 5: 0x0000000000000003 5: \"4\" 5 { 10: 5 }"
+    assertEquals("5: 1 5: 0x00000002 5: 0x0000000000000003 5: \"4\" 5: { 12: 6 } 5 { 10: 5 }"
         + " 8: 1 8: 2 8: 3 15: 12379813812177893520 15: 0xabcd1234 15:"
         + " 0xabcdef1234567890",
         TextFormat.shortDebugString(makeUnknownFieldSet()));
@@ -940,6 +1016,7 @@ public class TextFormatTest extends TestCase {
   }
 
 
+  // See additional coverage in testOneofOverwriteForbidden and testMapOverwriteForbidden.
   public void testParseNonRepeatedFields() throws Exception {
     assertParseSuccessWithOverwriteForbidden(
         "repeated_int32: 1\n" +
@@ -950,6 +1027,7 @@ public class TextFormatTest extends TestCase {
     assertParseSuccessWithOverwriteForbidden(
         "repeated_nested_message { bb: 1 }\n" +
         "repeated_nested_message { bb: 2 }\n");
+
     assertParseErrorWithOverwriteForbidden(
         "3:17: Non-repeated field " +
         "\"protobuf_unittest.TestAllTypes.optional_int32\" " +
@@ -988,6 +1066,7 @@ public class TextFormatTest extends TestCase {
     assertParseSuccessWithOverwriteForbidden("repeated_int32: [ 1, 2 ]\n");
     assertParseSuccessWithOverwriteForbidden("RepeatedGroup [{ a: 1 },{ a: 2 }]\n");
     assertParseSuccessWithOverwriteForbidden("repeated_nested_message [{ bb: 1 }, { bb: 2 }]\n");
+    // See also testMapShortForm.
   }
 
   public void testParseShortRepeatedFormOfEmptyRepeatedFields() throws Exception {
@@ -995,6 +1074,7 @@ public class TextFormatTest extends TestCase {
     assertParseSuccessWithOverwriteForbidden("repeated_int32: []\n");
     assertParseSuccessWithOverwriteForbidden("RepeatedGroup []\n");
     assertParseSuccessWithOverwriteForbidden("repeated_nested_message []\n");
+    // See also testMapShortFormEmpty.
   }
 
   public void testParseShortRepeatedFormWithTrailingComma() throws Exception {
@@ -1010,6 +1090,7 @@ public class TextFormatTest extends TestCase {
     assertParseErrorWithOverwriteForbidden(
         "1:37: Expected \"{\".",
         "repeated_nested_message [{ bb: 1 }, ]\n");
+    // See also testMapShortFormTrailingComma.
   }
 
   public void testParseShortRepeatedFormOfNonRepeatedFields() throws Exception {
@@ -1058,6 +1139,90 @@ public class TextFormatTest extends TestCase {
   }
 
   // =======================================================================
+  // test map
+
+  public void testMapTextFormat() throws Exception {
+    TestMap message =
+        TestMap.newBuilder()
+            .putInt32ToStringField(10, "apple")
+            .putInt32ToStringField(20, "banana")
+            .putInt32ToStringField(30, "cherry")
+            .build();
+    String text = TextFormat.printToUnicodeString(message);
+    {
+      TestMap.Builder dest = TestMap.newBuilder();
+      TextFormat.merge(text, dest);
+      assertEquals(message, dest.build());
+    }
+    {
+      TestMap.Builder dest = TestMap.newBuilder();
+      parserWithOverwriteForbidden.merge(text, dest);
+      assertEquals(message, dest.build());
+    }
+  }
+
+  public void testMapShortForm() throws Exception {
+    String text =
+        "string_to_int32_field [{ key: 'x' value: 10 }, { key: 'y' value: 20 }]\n"
+        + "int32_to_message_field "
+        + "[{ key: 1 value { value: 100 } }, { key: 2 value: { value: 200 } }]\n";
+    TestMap.Builder dest = TestMap.newBuilder();
+    parserWithOverwriteForbidden.merge(text, dest);
+    TestMap message = dest.build();
+    assertEquals(2, message.getStringToInt32Field().size());
+    assertEquals(2, message.getInt32ToMessageField().size());
+    assertEquals(10, message.getStringToInt32Field().get("x").intValue());
+    assertEquals(200, message.getInt32ToMessageField().get(2).getValue());
+  }
+
+  public void testMapShortFormEmpty() throws Exception {
+    String text = "string_to_int32_field []\n"
+        + "int32_to_message_field: []\n";
+    TestMap.Builder dest = TestMap.newBuilder();
+    parserWithOverwriteForbidden.merge(text, dest);
+    TestMap message = dest.build();
+    assertEquals(0, message.getStringToInt32Field().size());
+    assertEquals(0, message.getInt32ToMessageField().size());
+  }
+
+  public void testMapShortFormTrailingComma() throws Exception {
+    String text = "string_to_int32_field [{ key: 'x' value: 10 }, ]\n";
+    TestMap.Builder dest = TestMap.newBuilder();
+    try {
+      parserWithOverwriteForbidden.merge(text, dest);
+      fail("Expected parse exception.");
+    } catch (TextFormat.ParseException e) {
+      assertEquals("1:48: Expected \"{\".", e.getMessage());
+    }
+  }
+
+  public void testMapOverwrite() throws Exception {
+    String text =
+        "int32_to_int32_field { key: 1 value: 10 }\n"
+            + "int32_to_int32_field { key: 2 value: 20 }\n"
+            + "int32_to_int32_field { key: 1 value: 30 }\n";
+
+    {
+      // With default parser, last value set for the key holds.
+      TestMap.Builder builder = TestMap.newBuilder();
+      defaultParser.merge(text, builder);
+      TestMap map = builder.build();
+      assertEquals(2, map.getInt32ToInt32Field().size());
+      assertEquals(30, map.getInt32ToInt32Field().get(1).intValue());
+    }
+
+    {
+      // With overwrite forbidden, same behavior.
+      // TODO(b/29122459): Expect parse exception here.
+      TestMap.Builder builder = TestMap.newBuilder();
+      defaultParser.merge(text, builder);
+      TestMap map = builder.build();
+      assertEquals(2, map.getInt32ToInt32Field().size());
+      assertEquals(30, map.getInt32ToInt32Field().get(1).intValue());
+    }
+  }
+
+  // =======================================================================
   // test location information
 
   public void testParseInfoTreeBuilding() throws Exception {
diff --git a/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java b/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
index 8f45976f..88cbbf86 100644
--- a/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownEnumValueTest.java
@@ -36,7 +36,6 @@ import com.google.protobuf.Descriptors.EnumValueDescriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
 import com.google.protobuf.FieldPresenceTestProto.TestAllTypes;
 import com.google.protobuf.TextFormat.ParseException;
-
 import junit.framework.TestCase;
 
 /**
@@ -151,18 +150,15 @@ public class UnknownEnumValueTest extends TestCase {
     assertEquals(4321, unknown4321.getNumber());
     assertEquals(5432, unknown5432.getNumber());
     assertEquals(6543, unknown6543.getNumber());
-    
+
     // Unknown EnumValueDescriptor will map to UNRECOGNIZED.
     assertEquals(
-        TestAllTypes.NestedEnum.valueOf(unknown4321),
-        TestAllTypes.NestedEnum.UNRECOGNIZED);
+        TestAllTypes.NestedEnum.UNRECOGNIZED, TestAllTypes.NestedEnum.valueOf(unknown4321));
     assertEquals(
-        TestAllTypes.NestedEnum.valueOf(unknown5432),
-        TestAllTypes.NestedEnum.UNRECOGNIZED);
+        TestAllTypes.NestedEnum.UNRECOGNIZED, TestAllTypes.NestedEnum.valueOf(unknown5432));
     assertEquals(
-        TestAllTypes.NestedEnum.valueOf(unknown6543),
-        TestAllTypes.NestedEnum.UNRECOGNIZED);
-    
+        TestAllTypes.NestedEnum.UNRECOGNIZED, TestAllTypes.NestedEnum.valueOf(unknown6543));
+
     // Setters also accept unknown EnumValueDescriptor.
     builder.setField(optionalNestedEnumField, unknown6543);
     builder.setRepeatedField(repeatedNestedEnumField, 0, unknown4321);
diff --git a/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
index f8cb0aab..8ce0ca73 100644
--- a/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetLiteTest.java
@@ -30,13 +30,24 @@
 
 package com.google.protobuf;
 
+import static junit.framework.TestCase.assertEquals;
+
 import com.google.protobuf.UnittestLite.TestAllExtensionsLite;
 import com.google.protobuf.UnittestLite.TestAllTypesLite;
+import protobuf_unittest.UnittestProto;
+import protobuf_unittest.UnittestProto.ForeignEnum;
+import protobuf_unittest.UnittestProto.TestAllExtensions;
+import protobuf_unittest.UnittestProto.TestAllTypes;
+import protobuf_unittest.UnittestProto.TestEmptyMessage;
+import protobuf_unittest.UnittestProto.TestPackedExtensions;
+import protobuf_unittest.UnittestProto.TestPackedTypes;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Bar;
 import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Foo;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.Map;
 import junit.framework.TestCase;
 
 /**
@@ -45,7 +56,44 @@ import junit.framework.TestCase;
  * @author dweis@google.com (Daniel Weis)
  */
 public class UnknownFieldSetLiteTest extends TestCase {
-  
+  @Override
+  public void setUp() throws Exception {
+    allFields = TestUtil.getAllSet();
+    allFieldsData = allFields.toByteString();
+    emptyMessage = TestEmptyMessage.parseFrom(allFieldsData);
+    unknownFields = emptyMessage.getUnknownFields();
+  }
+
+  TestAllTypes allFields;
+  ByteString allFieldsData;
+
+  // Constructs a protocol buffer which contains fields with all the same
+  // numbers as allFieldsData except that each field is some other wire
+  // type.
+  private ByteString getBizarroData() throws Exception {
+    UnknownFieldSet.Builder bizarroFields = UnknownFieldSet.newBuilder();
+
+    UnknownFieldSet.Field varintField = UnknownFieldSet.Field.newBuilder().addVarint(1).build();
+    UnknownFieldSet.Field fixed32Field = UnknownFieldSet.Field.newBuilder().addFixed32(1).build();
+
+    for (Map.Entry<Integer, UnknownFieldSet.Field> entry : unknownFields.asMap().entrySet()) {
+      if (entry.getValue().getVarintList().isEmpty()) {
+        // Original field is not a varint, so use a varint.
+        bizarroFields.addField(entry.getKey(), varintField);
+      } else {
+        // Original field *is* a varint, so use something else.
+        bizarroFields.addField(entry.getKey(), fixed32Field);
+      }
+    }
+
+    return bizarroFields.build().toByteString();
+  }
+
+  // An empty message that has been parsed from allFieldsData.  So, it has
+  // unknown fields of every type.
+  TestEmptyMessage emptyMessage;
+  UnknownFieldSet unknownFields;
+
   public void testDefaultInstance() {
     UnknownFieldSetLite unknownFields = UnknownFieldSetLite.getDefaultInstance();
 
@@ -87,6 +135,25 @@ public class UnknownFieldSetLiteTest extends TestCase {
     assertEquals(foo.toByteString().size(), instance.getSerializedSize());
   }
 
+  public void testHashCodeAfterDeserialization() throws IOException {
+    Foo foo = Foo.newBuilder()
+      .setValue(2)
+      .build();
+
+    Foo fooDeserialized = Foo.parseFrom(foo.toByteArray());
+
+    assertEquals(fooDeserialized, foo);
+    assertEquals(foo.hashCode(), fooDeserialized.hashCode());
+  }
+
+  public void testNewInstanceHashCode() {
+    UnknownFieldSetLite emptyFieldSet = UnknownFieldSetLite.getDefaultInstance();
+    UnknownFieldSetLite paddedFieldSet = UnknownFieldSetLite.newInstance();
+
+    assertEquals(emptyFieldSet, paddedFieldSet);
+    assertEquals(emptyFieldSet.hashCode(), paddedFieldSet.hashCode());
+  }
+
   public void testMergeVarintField() throws IOException {
     UnknownFieldSetLite unknownFields = UnknownFieldSetLite.newInstance();
     unknownFields.mergeVarintField(10, 2);
@@ -331,4 +398,203 @@ public class UnknownFieldSetLiteTest extends TestCase {
     }
     return ByteString.copyFrom(byteArrayOutputStream.toByteArray());
   }
+
+  public void testSerializeLite() throws Exception {
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
+    assertEquals(allFieldsData.size(), emptyMessageLite.getSerializedSize());
+    ByteString data = emptyMessageLite.toByteString();
+    TestAllTypes message = TestAllTypes.parseFrom(data);
+    TestUtil.assertAllFieldsSet(message);
+    assertEquals(allFieldsData, data);
+  }
+
+  public void testAllExtensionsLite() throws Exception {
+    TestAllExtensions allExtensions = TestUtil.getAllExtensionsSet();
+    ByteString allExtensionsData = allExtensions.toByteString();
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parser().parseFrom(allExtensionsData);
+    ByteString data = emptyMessageLite.toByteString();
+    TestAllExtensions message = TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
+    TestUtil.assertAllExtensionsSet(message);
+    assertEquals(allExtensionsData, data);
+  }
+
+  public void testAllPackedFieldsLite() throws Exception {
+    TestPackedTypes allPackedFields = TestUtil.getPackedSet();
+    ByteString allPackedData = allPackedFields.toByteString();
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(allPackedData);
+    ByteString data = emptyMessageLite.toByteString();
+    TestPackedTypes message = TestPackedTypes.parseFrom(data, TestUtil.getExtensionRegistry());
+    TestUtil.assertPackedFieldsSet(message);
+    assertEquals(allPackedData, data);
+  }
+
+  public void testAllPackedExtensionsLite() throws Exception {
+    TestPackedExtensions allPackedExtensions = TestUtil.getPackedExtensionsSet();
+    ByteString allPackedExtensionsData = allPackedExtensions.toByteString();
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(allPackedExtensionsData);
+    ByteString data = emptyMessageLite.toByteString();
+    TestPackedExtensions message =
+        TestPackedExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
+    TestUtil.assertPackedExtensionsSet(message);
+    assertEquals(allPackedExtensionsData, data);
+  }
+
+  public void testCopyFromLite() throws Exception {
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
+    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
+        UnittestLite.TestEmptyMessageLite.newBuilder().mergeFrom(emptyMessageLite).build();
+    assertEquals(emptyMessageLite.toByteString(), emptyMessageLite2.toByteString());
+  }
+
+  public void testMergeFromLite() throws Exception {
+    TestAllTypes message1 =
+        TestAllTypes.newBuilder()
+            .setOptionalInt32(1)
+            .setOptionalString("foo")
+            .addRepeatedString("bar")
+            .setOptionalNestedEnum(TestAllTypes.NestedEnum.BAZ)
+            .build();
+
+    TestAllTypes message2 =
+        TestAllTypes.newBuilder()
+            .setOptionalInt64(2)
+            .setOptionalString("baz")
+            .addRepeatedString("qux")
+            .setOptionalForeignEnum(ForeignEnum.FOREIGN_BAZ)
+            .build();
+
+    ByteString data1 = message1.toByteString();
+    UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
+        UnittestLite.TestEmptyMessageLite.parseFrom(data1);
+    ByteString data2 = message2.toByteString();
+    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
+        UnittestLite.TestEmptyMessageLite.parseFrom(data2);
+
+    message1 = TestAllTypes.newBuilder(message1).mergeFrom(message2).build();
+    emptyMessageLite1 =
+        UnittestLite.TestEmptyMessageLite.newBuilder(emptyMessageLite1)
+            .mergeFrom(emptyMessageLite2)
+            .build();
+
+    data1 = emptyMessageLite1.toByteString();
+    message2 = TestAllTypes.parseFrom(data1);
+
+    assertEquals(message1, message2);
+  }
+
+  public void testWrongTypeTreatedAsUnknownLite() throws Exception {
+    // Test that fields of the wrong wire type are treated like unknown fields
+    // when parsing.
+
+    ByteString bizarroData = getBizarroData();
+    TestAllTypes allTypesMessage = TestAllTypes.parseFrom(bizarroData);
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
+    ByteString data = emptyMessageLite.toByteString();
+    TestAllTypes allTypesMessage2 = TestAllTypes.parseFrom(data);
+
+    assertEquals(allTypesMessage.toString(), allTypesMessage2.toString());
+  }
+
+  public void testUnknownExtensionsLite() throws Exception {
+    // Make sure fields are properly parsed to the UnknownFieldSet even when
+    // they are declared as extension numbers.
+
+    UnittestLite.TestEmptyMessageWithExtensionsLite message =
+        UnittestLite.TestEmptyMessageWithExtensionsLite.parseFrom(allFieldsData);
+
+    assertEquals(allFieldsData, message.toByteString());
+  }
+
+  public void testWrongExtensionTypeTreatedAsUnknownLite() throws Exception {
+    // Test that fields of the wrong wire type are treated like unknown fields
+    // when parsing extensions.
+
+    ByteString bizarroData = getBizarroData();
+    TestAllExtensions allExtensionsMessage = TestAllExtensions.parseFrom(bizarroData);
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
+
+    // All fields should have been interpreted as unknown, so the byte strings
+    // should be the same.
+    assertEquals(emptyMessageLite.toByteString(), allExtensionsMessage.toByteString());
+  }
+
+  public void testParseUnknownEnumValueLite() throws Exception {
+    Descriptors.FieldDescriptor singularField =
+        TestAllTypes.getDescriptor().findFieldByName("optional_nested_enum");
+    Descriptors.FieldDescriptor repeatedField =
+        TestAllTypes.getDescriptor().findFieldByName("repeated_nested_enum");
+    assertNotNull(singularField);
+    assertNotNull(repeatedField);
+
+    ByteString data =
+        UnknownFieldSet.newBuilder()
+            .addField(
+                singularField.getNumber(),
+                UnknownFieldSet.Field.newBuilder()
+                    .addVarint(TestAllTypes.NestedEnum.BAR.getNumber())
+                    .addVarint(5) // not valid
+                    .build())
+            .addField(
+                repeatedField.getNumber(),
+                UnknownFieldSet.Field.newBuilder()
+                    .addVarint(TestAllTypes.NestedEnum.FOO.getNumber())
+                    .addVarint(4) // not valid
+                    .addVarint(TestAllTypes.NestedEnum.BAZ.getNumber())
+                    .addVarint(6) // not valid
+                    .build())
+            .build()
+            .toByteString();
+
+    UnittestLite.TestEmptyMessageLite emptyMessageLite =
+        UnittestLite.TestEmptyMessageLite.parseFrom(data);
+    data = emptyMessageLite.toByteString();
+
+    {
+      TestAllTypes message = TestAllTypes.parseFrom(data);
+      assertEquals(TestAllTypes.NestedEnum.BAR, message.getOptionalNestedEnum());
+      assertEquals(
+          Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
+          message.getRepeatedNestedEnumList());
+      assertEquals(
+          Arrays.asList(5L),
+          message.getUnknownFields().getField(singularField.getNumber()).getVarintList());
+      assertEquals(
+          Arrays.asList(4L, 6L),
+          message.getUnknownFields().getField(repeatedField.getNumber()).getVarintList());
+    }
+
+    {
+      TestAllExtensions message =
+          TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
+      assertEquals(
+          TestAllTypes.NestedEnum.BAR,
+          message.getExtension(UnittestProto.optionalNestedEnumExtension));
+      assertEquals(
+          Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
+          message.getExtension(UnittestProto.repeatedNestedEnumExtension));
+      assertEquals(
+          Arrays.asList(5L),
+          message.getUnknownFields().getField(singularField.getNumber()).getVarintList());
+      assertEquals(
+          Arrays.asList(4L, 6L),
+          message.getUnknownFields().getField(repeatedField.getNumber()).getVarintList());
+    }
+  }
+
+  public void testClearLite() throws Exception {
+    UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
+        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
+    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
+        UnittestLite.TestEmptyMessageLite.newBuilder().mergeFrom(emptyMessageLite1).clear().build();
+    assertEquals(0, emptyMessageLite2.getSerializedSize());
+    ByteString data = emptyMessageLite2.toByteString();
+    assertEquals(0, data.size());
+  }
 }
diff --git a/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
index f81e90b4..1a84806a 100644
--- a/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
+++ b/java/core/src/test/java/com/google/protobuf/UnknownFieldSetTest.java
@@ -445,208 +445,4 @@ public class UnknownFieldSetTest extends TestCase {
   }
 
   // =================================================================
-
-  public void testSerializeLite() throws Exception {
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
-    assertEquals(allFieldsData.size(), emptyMessageLite.getSerializedSize());
-    ByteString data = emptyMessageLite.toByteString();
-    TestAllTypes message = TestAllTypes.parseFrom(data);
-    TestUtil.assertAllFieldsSet(message);
-    assertEquals(allFieldsData, data);
-  }
-
-  public void testAllExtensionsLite() throws Exception {
-    TestAllExtensions allExtensions = TestUtil.getAllExtensionsSet();
-    ByteString allExtensionsData = allExtensions.toByteString();
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parser().parseFrom(allExtensionsData);
-    ByteString data = emptyMessageLite.toByteString();
-    TestAllExtensions message =
-        TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
-    TestUtil.assertAllExtensionsSet(message);
-    assertEquals(allExtensionsData, data);
-  }
-
-  public void testAllPackedFieldsLite() throws Exception {
-    TestPackedTypes allPackedFields = TestUtil.getPackedSet();
-    ByteString allPackedData = allPackedFields.toByteString();
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(allPackedData);
-    ByteString data = emptyMessageLite.toByteString();
-    TestPackedTypes message =
-        TestPackedTypes.parseFrom(data, TestUtil.getExtensionRegistry());
-    TestUtil.assertPackedFieldsSet(message);
-    assertEquals(allPackedData, data);
-  }
-
-  public void testAllPackedExtensionsLite() throws Exception {
-    TestPackedExtensions allPackedExtensions = TestUtil.getPackedExtensionsSet();
-    ByteString allPackedExtensionsData = allPackedExtensions.toByteString();
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(allPackedExtensionsData);
-    ByteString data = emptyMessageLite.toByteString();
-    TestPackedExtensions message =
-        TestPackedExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
-    TestUtil.assertPackedExtensionsSet(message);
-    assertEquals(allPackedExtensionsData, data);
-  }
-
-  public void testCopyFromLite() throws Exception {
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
-    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
-        UnittestLite.TestEmptyMessageLite.newBuilder()
-        .mergeFrom(emptyMessageLite).build();
-    assertEquals(emptyMessageLite.toByteString(), emptyMessageLite2.toByteString());
-  }
-
-  public void testMergeFromLite() throws Exception {
-    TestAllTypes message1 = TestAllTypes.newBuilder()
-        .setOptionalInt32(1)
-        .setOptionalString("foo")
-        .addRepeatedString("bar")
-        .setOptionalNestedEnum(TestAllTypes.NestedEnum.BAZ)
-        .build();
-
-    TestAllTypes message2 = TestAllTypes.newBuilder()
-        .setOptionalInt64(2)
-        .setOptionalString("baz")
-        .addRepeatedString("qux")
-        .setOptionalForeignEnum(ForeignEnum.FOREIGN_BAZ)
-        .build();
-
-    ByteString data1 = message1.toByteString();
-    UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
-        UnittestLite.TestEmptyMessageLite.parseFrom(data1);
-    ByteString data2 = message2.toByteString();
-    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
-        UnittestLite.TestEmptyMessageLite.parseFrom(data2);
-
-    message1 = TestAllTypes.newBuilder(message1).mergeFrom(message2).build();
-    emptyMessageLite1 = UnittestLite.TestEmptyMessageLite.newBuilder(emptyMessageLite1)
-                        .mergeFrom(emptyMessageLite2).build();
-
-    data1 = emptyMessageLite1.toByteString();
-    message2 = TestAllTypes.parseFrom(data1);
-
-    assertEquals(message1, message2);
-  }
-
-  public void testWrongTypeTreatedAsUnknownLite() throws Exception {
-    // Test that fields of the wrong wire type are treated like unknown fields
-    // when parsing.
-
-    ByteString bizarroData = getBizarroData();
-    TestAllTypes allTypesMessage = TestAllTypes.parseFrom(bizarroData);
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
-    ByteString data = emptyMessageLite.toByteString();
-    TestAllTypes allTypesMessage2 = TestAllTypes.parseFrom(data);
-
-    assertEquals(allTypesMessage.toString(), allTypesMessage2.toString());
-  }
-
-  public void testUnknownExtensionsLite() throws Exception {
-    // Make sure fields are properly parsed to the UnknownFieldSet even when
-    // they are declared as extension numbers.
-
-    UnittestLite.TestEmptyMessageWithExtensionsLite message =
-      UnittestLite.TestEmptyMessageWithExtensionsLite.parseFrom(allFieldsData);
-
-    assertEquals(allFieldsData, message.toByteString());
-  }
-
-  public void testWrongExtensionTypeTreatedAsUnknownLite() throws Exception {
-    // Test that fields of the wrong wire type are treated like unknown fields
-    // when parsing extensions.
-
-    ByteString bizarroData = getBizarroData();
-    TestAllExtensions allExtensionsMessage =
-      TestAllExtensions.parseFrom(bizarroData);
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(bizarroData);
-
-    // All fields should have been interpreted as unknown, so the byte strings
-    // should be the same.
-    assertEquals(emptyMessageLite.toByteString(),
-                 allExtensionsMessage.toByteString());
-  }
-
-  public void testParseUnknownEnumValueLite() throws Exception {
-    Descriptors.FieldDescriptor singularField =
-      TestAllTypes.getDescriptor().findFieldByName("optional_nested_enum");
-    Descriptors.FieldDescriptor repeatedField =
-      TestAllTypes.getDescriptor().findFieldByName("repeated_nested_enum");
-    assertNotNull(singularField);
-    assertNotNull(repeatedField);
-
-    ByteString data =
-      UnknownFieldSet.newBuilder()
-        .addField(singularField.getNumber(),
-          UnknownFieldSet.Field.newBuilder()
-            .addVarint(TestAllTypes.NestedEnum.BAR.getNumber())
-            .addVarint(5)   // not valid
-            .build())
-        .addField(repeatedField.getNumber(),
-          UnknownFieldSet.Field.newBuilder()
-            .addVarint(TestAllTypes.NestedEnum.FOO.getNumber())
-            .addVarint(4)   // not valid
-            .addVarint(TestAllTypes.NestedEnum.BAZ.getNumber())
-            .addVarint(6)   // not valid
-            .build())
-        .build()
-        .toByteString();
-
-    UnittestLite.TestEmptyMessageLite emptyMessageLite =
-        UnittestLite.TestEmptyMessageLite.parseFrom(data);
-    data = emptyMessageLite.toByteString();
-
-    {
-      TestAllTypes message = TestAllTypes.parseFrom(data);
-      assertEquals(TestAllTypes.NestedEnum.BAR,
-                   message.getOptionalNestedEnum());
-      assertEquals(
-        Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
-        message.getRepeatedNestedEnumList());
-      assertEquals(Arrays.asList(5L),
-                   message.getUnknownFields()
-                          .getField(singularField.getNumber())
-                          .getVarintList());
-      assertEquals(Arrays.asList(4L, 6L),
-                   message.getUnknownFields()
-                          .getField(repeatedField.getNumber())
-                          .getVarintList());
-    }
-
-    {
-      TestAllExtensions message =
-        TestAllExtensions.parseFrom(data, TestUtil.getExtensionRegistry());
-      assertEquals(TestAllTypes.NestedEnum.BAR,
-        message.getExtension(UnittestProto.optionalNestedEnumExtension));
-      assertEquals(
-        Arrays.asList(TestAllTypes.NestedEnum.FOO, TestAllTypes.NestedEnum.BAZ),
-        message.getExtension(UnittestProto.repeatedNestedEnumExtension));
-      assertEquals(Arrays.asList(5L),
-                   message.getUnknownFields()
-                          .getField(singularField.getNumber())
-                          .getVarintList());
-      assertEquals(Arrays.asList(4L, 6L),
-                   message.getUnknownFields()
-                          .getField(repeatedField.getNumber())
-                          .getVarintList());
-    }
-  }
-
-  public void testClearLite() throws Exception {
-    UnittestLite.TestEmptyMessageLite emptyMessageLite1 =
-        UnittestLite.TestEmptyMessageLite.parseFrom(allFieldsData);
-    UnittestLite.TestEmptyMessageLite emptyMessageLite2 =
-        UnittestLite.TestEmptyMessageLite.newBuilder()
-        .mergeFrom(emptyMessageLite1).clear().build();
-    assertEquals(0, emptyMessageLite2.getSerializedSize());
-    ByteString data = emptyMessageLite2.toByteString();
-    assertEquals(0, data.size());
-  }
-
 }
diff --git a/java/core/src/test/java/com/google/protobuf/WireFormatTest.java b/java/core/src/test/java/com/google/protobuf/WireFormatTest.java
index 370860c2..03c33ecf 100644
--- a/java/core/src/test/java/com/google/protobuf/WireFormatTest.java
+++ b/java/core/src/test/java/com/google/protobuf/WireFormatTest.java
@@ -30,14 +30,13 @@
 
 package com.google.protobuf;
 
-import com.google.protobuf.UnittestLite.TestAllExtensionsLite;
-import com.google.protobuf.UnittestLite.TestPackedExtensionsLite;
 import protobuf_unittest.UnittestMset.RawMessageSet;
 import protobuf_unittest.UnittestMset.TestMessageSetExtension1;
 import protobuf_unittest.UnittestMset.TestMessageSetExtension2;
 import protobuf_unittest.UnittestProto;
 import protobuf_unittest.UnittestProto.TestAllExtensions;
 import protobuf_unittest.UnittestProto.TestAllTypes;
+import protobuf_unittest.UnittestProto.TestExtensionInsideTable;
 import protobuf_unittest.UnittestProto.TestFieldOrderings;
 import protobuf_unittest.UnittestProto.TestOneof2;
 import protobuf_unittest.UnittestProto.TestOneofBackwardsCompatible;
@@ -125,32 +124,6 @@ public class WireFormatTest extends TestCase {
     TestUtil.assertPackedFieldsSet(message2);
   }
 
-  public void testSerializeExtensionsLite() throws Exception {
-    // TestAllTypes and TestAllExtensions should have compatible wire formats,
-    // so if we serialize a TestAllExtensions then parse it as TestAllTypes
-    // it should work.
-
-    TestAllExtensionsLite message = TestUtilLite.getAllLiteExtensionsSet();
-    ByteString rawBytes = message.toByteString();
-    assertEquals(rawBytes.size(), message.getSerializedSize());
-
-    TestAllTypes message2 = TestAllTypes.parseFrom(rawBytes);
-
-    TestUtil.assertAllFieldsSet(message2);
-  }
-
-  public void testSerializePackedExtensionsLite() throws Exception {
-    // TestPackedTypes and TestPackedExtensions should have compatible wire
-    // formats; check that they serialize to the same string.
-    TestPackedExtensionsLite message = TestUtilLite.getLitePackedExtensionsSet();
-    ByteString rawBytes = message.toByteString();
-
-    TestPackedTypes message2 = TestUtil.getPackedSet();
-    ByteString rawBytes2 = message2.toByteString();
-
-    assertEquals(rawBytes, rawBytes2);
-  }
-
   public void testParseExtensions() throws Exception {
     // TestAllTypes and TestAllExtensions should have compatible wire formats,
     // so if we serialize a TestAllTypes then parse it as TestAllExtensions
@@ -180,48 +153,6 @@ public class WireFormatTest extends TestCase {
     TestUtil.assertPackedExtensionsSet(message2);
   }
 
-  public void testParseExtensionsLite() throws Exception {
-    // TestAllTypes and TestAllExtensions should have compatible wire formats,
-    // so if we serialize a TestAllTypes then parse it as TestAllExtensions
-    // it should work.
-
-    TestAllTypes message = TestUtil.getAllSet();
-    ByteString rawBytes = message.toByteString();
-
-    ExtensionRegistryLite registry_lite = TestUtilLite.getExtensionRegistryLite();
-
-    TestAllExtensionsLite message2 =
-      TestAllExtensionsLite.parseFrom(rawBytes, registry_lite);
-
-    TestUtil.assertAllExtensionsSet(message2);
-
-    // Try again using a full extension registry.
-    ExtensionRegistry registry = TestUtil.getExtensionRegistry();
-
-    TestAllExtensionsLite message3 =
-      TestAllExtensionsLite.parseFrom(rawBytes, registry);
-
-    TestUtil.assertAllExtensionsSet(message3);
-  }
-
-  public void testParsePackedExtensionsLite() throws Exception {
-    // Ensure that packed extensions can be properly parsed.
-    TestPackedExtensionsLite message = TestUtilLite.getLitePackedExtensionsSet();
-    ByteString rawBytes = message.toByteString();
-
-    ExtensionRegistryLite registry = TestUtilLite.getExtensionRegistryLite();
-
-    TestPackedExtensionsLite message2 =
-        TestPackedExtensionsLite.parseFrom(rawBytes, registry);
-
-    TestUtil.assertPackedExtensionsSet(message2);
-  }
-
-  public void testExtensionsSerializedSize() throws Exception {
-    assertNotSame(TestUtil.getAllSet().getSerializedSize(),
-                  TestUtil.getAllExtensionsSet().getSerializedSize());
-  }
-
   public void testSerializeDelimited() throws Exception {
     ByteArrayOutputStream output = new ByteArrayOutputStream();
     TestUtil.getAllSet().writeDelimitedTo(output);
@@ -305,6 +236,26 @@ public class WireFormatTest extends TestCase {
                                    getTestFieldOrderingsRegistry());
     assertEquals(source, dest);
   }
+  
+  private static ExtensionRegistry getTestExtensionInsideTableRegistry() {
+    ExtensionRegistry result = ExtensionRegistry.newInstance();
+    result.add(UnittestProto.testExtensionInsideTableExtension);
+    return result;
+  }
+  
+  public void testExtensionInsideTable() throws Exception {
+    // Make sure the extension within the range of table is parsed correctly in experimental
+    // runtime.
+    TestExtensionInsideTable source =
+        TestExtensionInsideTable.newBuilder()
+        .setField1(1)
+        .setExtension(UnittestProto.testExtensionInsideTableExtension, 23)
+        .build();
+    TestExtensionInsideTable dest =
+        TestExtensionInsideTable.parseFrom(source.toByteString(),
+            getTestExtensionInsideTableRegistry());
+    assertEquals(source, dest);
+  }
 
   public void testParseMultipleExtensionRangesDynamic() throws Exception {
     // Same as above except with DynamicMessage.
diff --git a/java/core/src/test/proto/com/google/protobuf/deprecated_file.proto b/java/core/src/test/proto/com/google/protobuf/deprecated_file.proto
new file mode 100644
index 00000000..ca90e927
--- /dev/null
+++ b/java/core/src/test/proto/com/google/protobuf/deprecated_file.proto
@@ -0,0 +1,38 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+package deprecated_file;
+
+option deprecated = true;
+
+// TODO (liujisi): Add deprecation options on messages, enums fields as well and
+// add tests to verify those annotations are actually generated.
diff --git a/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto b/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto
index 6eef42c5..b18b0d79 100644
--- a/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto
+++ b/java/core/src/test/proto/com/google/protobuf/lite_equals_and_hash.proto
@@ -46,6 +46,14 @@ message TestOneofEquals {
 message Foo {
   optional int32 value = 1;
   repeated Bar bar = 2;
+  map<string, string> my_map = 3;
+  oneof Single {
+    sint64 sint64 = 4;
+    // LINT: ALLOW_GROUPS
+    group MyGroup = 5 {
+      optional int32 value = 1;
+    }
+  }
 
   extensions 100 to max;
 }
diff --git a/java/core/src/test/proto/com/google/protobuf/map_lite_test.proto b/java/core/src/test/proto/com/google/protobuf/map_lite_test.proto
new file mode 100644
index 00000000..c04f5d57
--- /dev/null
+++ b/java/core/src/test/proto/com/google/protobuf/map_lite_test.proto
@@ -0,0 +1,111 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+package map_lite_test;
+
+option optimize_for = LITE_RUNTIME;
+option java_package = "map_lite_test";
+option java_outer_classname = "MapTestProto";
+
+message TestMap {
+  message MessageValue {
+    int32 value = 1;
+  }
+  enum EnumValue {
+    FOO = 0;
+    BAR = 1;
+    BAZ = 2;
+    QUX = 3;
+  }
+
+  map<int32, int32>        int32_to_int32_field = 1;
+  map<int32, string>       int32_to_string_field = 2;
+  map<int32, bytes>        int32_to_bytes_field = 3;
+  map<int32, EnumValue>    int32_to_enum_field = 4;
+  map<int32, MessageValue> int32_to_message_field = 5;
+  map<string, int32>       string_to_int32_field = 6;
+  map<uint32, int32>       uint32_to_int32_field = 7;
+  map<int64, int32>        int64_to_int32_field = 8;
+}
+
+// Used to test that a nested builder containing map fields will properly
+// propagate the onChange event and mark its parent dirty when a change
+// is made to a map field.
+message TestOnChangeEventPropagation {
+  TestMap optional_message = 1;
+}
+
+// a decoy of TestMap for testing parsing errors
+message BizarroTestMap {
+  map<int32, bytes> int32_to_int32_field = 1; // same key type, different value
+  map<string, int32> int32_to_string_field = 2; // different key and value types
+  map<string, int32> int32_to_bytes_field = 3; // different key types, same value
+  map<string, bytes> int32_to_enum_field = 4; // different key and value types
+  map<string, bytes> int32_to_message_field = 5; // different key and value types
+  map<string, bytes> string_to_int32_field = 6;  // same key type, different value
+}
+
+// Used to test that java reserved words can be used as protobuf field names
+// Not all reserved words are tested (to avoid bloat) but instead an arbitrary
+// subset of them chosen to cover various keyword categories like
+// type, modifier, declaration, etc.
+message ReservedAsMapField {
+  map<string, uint32> if = 1;
+  map<string, uint32> const = 2;
+  map<string, uint32> private = 3;
+  map<string, uint32> class = 4;
+  map<string, uint32> int = 5;
+  map<string, uint32> void = 6;
+  map<string, uint32> string = 7; // These are also proto keywords
+  map<string, uint32> package = 8;
+  map<string, uint32> enum = 9; // Most recent Java reserved word
+  map<string, uint32> null = 10;
+  // null is not a 'reserved word' per se but as a literal needs similar care
+}
+
+message ReservedAsMapFieldWithEnumValue {
+  enum SampleEnum {
+    A = 0;
+    B = 1;
+  }
+  map<string, SampleEnum> if = 1;
+  map<string, SampleEnum> const = 2;
+  map<string, SampleEnum> private = 3;
+  map<string, SampleEnum> class = 4;
+  map<string, SampleEnum> int = 5;
+  map<string, SampleEnum> void = 6;
+  map<string, SampleEnum> string = 7; // These are also proto keywords
+  map<string, SampleEnum> package = 8;
+  map<string, SampleEnum> enum = 9; // Most recent Java reserved word
+  map<string, SampleEnum> null = 10;
+  // null is not a 'reserved word' per se but as a literal needs similar care
+}
diff --git a/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto b/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto
index d2c77936..ff5bf3ae 100644
--- a/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto
+++ b/java/core/src/test/proto/com/google/protobuf/test_bad_identifiers.proto
@@ -148,6 +148,12 @@ message TestConflictingFieldNames {
   // the method getInt32FieldList().
   required int32 int32_field_list = 31;  // NO_PROTO3
 
+  // These field pairs have the same Java converted name
+  optional string field_name = 32; // NO_PROTO3
+  optional string field__name = 33; // NO_PROTO3
+  optional int32 _2conflict = 34; // NO_PROTO3
+  optional int32 __2conflict = 35;
+
   extensions 1000 to max;  // NO_PROTO3
 
   repeated int64 int64_field = 41;
@@ -166,3 +172,14 @@ message TestMapField {
 
   map<int32, int32> map_field = 1;
 }
+
+message TestLeadingNumberFields {
+  optional int32 _30day_impressions = 1;
+  repeated string _60day_impressions = 2;
+
+  optional string __2_underscores = 3;
+  repeated string __2repeated_underscores = 4;
+
+  optional int32 _32 = 32;
+  repeated int64 _64 = 64;
+}
diff --git a/java/lite.md b/java/lite.md
new file mode 100644
index 00000000..84a45ec5
--- /dev/null
+++ b/java/lite.md
@@ -0,0 +1,50 @@
+# Protocol Buffers - Google's data interchange format
+
+Copyright 2008 Google Inc.
+
+https://developers.google.com/protocol-buffers/
+
+## Use Protobuf Java Lite Runtime
+
+Protobuf Java Lite runtime is separated from the main Java runtime because
+it's designed/implemented with different constraints. In particular, Java
+Lite runtime has a much smaller code size which makes it more suitable to
+be used on Android.
+
+To use Java Lite runtime, you need to install protoc and the protoc plugin for
+Java Lite runtime. You can obtain protoc following the instructions in the
+toplevel [README.md](../README.md) file. For the protoc plugin, you can
+download it from maven:
+
+    https://repo1.maven.org/maven2/com/google/protobuf/protoc-gen-javalite/
+
+Choose the version that works on your platform (e.g., on windows you can
+download `protoc-gen-javalite-3.0.0-windows-x86_32.exe`), rename it to
+protoc-gen-javalite (or protoc-gen-javalite.exe on windows) and place it
+in a directory where it can be find in PATH.
+
+Once you have the protoc and protoc plugin, you can generate Java Lite code
+for your .proto files:
+
+    $ protoc --javalite_out=${OUTPUT_DIR} path/to/your/proto/file
+
+Include the generated Java files in your project and add a dependency on the
+protobuf Java runtime. If you are using Maven, use the following:
+
+```xml
+<dependency>
+  <groupId>com.google.protobuf</groupId>
+  <artifactId>protobuf-lite</artifactId>
+  <version>3.0.1</version>
+</dependency>
+```
+
+Make sure the version number of the runtime matches (or is newer than) the
+version number of the protoc plugin. The version number of the protoc doesn't
+matter and any version >= 3.0.0 should work.
+
+### Use Protobuf Java Lite Runtime with Bazel
+
+Bazel has native build rules to work with protobuf. For Java Lite runtime,
+you can use the `java_lite_proto_library` rule. Check out [our build files
+examples](../examples/BUILD) to learn how to use it.
diff --git a/java/lite/generate-sources-build.xml b/java/lite/generate-sources-build.xml
deleted file mode 100644
index 89c21c13..00000000
--- a/java/lite/generate-sources-build.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<project name="generate-sources">
-    <echo message="Running protoc ..."/>
-    <mkdir dir="${generated.sources.lite.dir}"/>
-    <exec executable="${protoc}">
-        <arg value="--java_out=lite:${generated.sources.lite.dir}"/>
-        <arg value="--proto_path=${protobuf.source.dir}"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/any.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/api.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/descriptor.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/duration.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/empty.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/field_mask.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/source_context.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/struct.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/timestamp.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/type.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/wrappers.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/compiler/plugin.proto"/>
-    </exec>
-</project>
diff --git a/java/lite/generate-test-sources-build.xml b/java/lite/generate-test-sources-build.xml
deleted file mode 100644
index cdd1ee89..00000000
--- a/java/lite/generate-test-sources-build.xml
+++ /dev/null
@@ -1,43 +0,0 @@
-<project name="generate-test-sources">
-    <mkdir dir="${generated.testsources.lite.dir}"/>
-    <exec executable="${protoc}">
-        <arg value="--java_out=lite:${generated.testsources.lite.dir}"/>
-        <arg value="--proto_path=${protobuf.source.dir}"/>
-        <arg value="--proto_path=${test.proto.dir}"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_import.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_import_public.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_mset.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_mset_wire_format.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_optimize_for.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_custom_options.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_lite.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_import_lite.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_import_public_lite.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_lite_imports_nonlite.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_enormous_descriptor.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_no_generic_services.proto"/>
-        <arg value="${protobuf.source.dir}/google/protobuf/unittest_well_known_types.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/lazy_fields_lite.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/lite_equals_and_hash.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/multiple_files_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/nested_builders_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/nested_extension.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/nested_extension_lite.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/non_nested_extension.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/non_nested_extension_lite.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/outer_class_name_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/outer_class_name_test2.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/outer_class_name_test3.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/test_bad_identifiers.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/test_check_utf8.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/test_check_utf8_size.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/test_custom_options.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/any_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/field_presence_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/map_for_proto2_lite_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/map_for_proto2_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/map_test.proto"/>
-        <arg value="${test.proto.dir}/com/google/protobuf/map_initialization_order_test.proto"/>
-    </exec>
-</project>
diff --git a/java/lite/pom.xml b/java/lite/pom.xml
deleted file mode 100644
index d7b15097..00000000
--- a/java/lite/pom.xml
+++ /dev/null
@@ -1,184 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>com.google.protobuf</groupId>
-    <artifactId>protobuf-parent</artifactId>
-    <version>3.0.0</version>
-  </parent>
-
-  <artifactId>protobuf-lite</artifactId>
-  <packaging>bundle</packaging>
-
-  <name>Protocol Buffers [Lite]</name>
-  <description>A trimmed-down version of the Protocol Buffers library.</description>
-
-  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>org.easymock</groupId>
-      <artifactId>easymock</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>org.easymock</groupId>
-      <artifactId>easymockclassextension</artifactId>
-    </dependency>
-  </dependencies>
-
-  <properties>
-    <core.root>../core</core.root>
-    <test.proto.dir>${core.root}/src/test/proto</test.proto.dir>
-  </properties>
-
-  <build>
-    <sourceDirectory>${core.root}/src/main/java</sourceDirectory>
-    <testSourceDirectory>${core.root}/src/test/java</testSourceDirectory>
-
-    <plugins>
-      <!-- Use Antrun plugin to generate sources with protoc -->
-      <plugin>
-        <artifactId>maven-antrun-plugin</artifactId>
-        <executions>
-          <!-- Generate core protos -->
-          <execution>
-            <id>generate-sources</id>
-            <phase>generate-sources</phase>
-            <configuration>
-              <target>
-                <ant antfile="generate-sources-build.xml"/>
-              </target>
-            </configuration>
-            <goals>
-              <goal>run</goal>
-            </goals>
-          </execution>
-
-          <!-- Generate the test protos -->
-          <execution>
-            <id>generate-test-sources</id>
-            <phase>generate-test-sources</phase>
-            <configuration>
-              <target>
-                <ant antfile="generate-test-sources-build.xml"/>
-              </target>
-            </configuration>
-            <goals>
-              <goal>run</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-
-      <!-- Only compile a subset of the files -->
-      <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>build-helper-maven-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>add-generated-sources</id>
-            <phase>generate-sources</phase>
-            <goals>
-              <goal>add-source</goal>
-            </goals>
-            <configuration>
-              <sources>
-                <source>${generated.sources.lite.dir}</source>
-              </sources>
-            </configuration>
-          </execution>
-          <execution>
-            <id>add-generated-test-sources</id>
-            <phase>generate-test-sources</phase>
-            <goals>
-              <goal>add-test-source</goal>
-            </goals>
-            <configuration>
-              <sources>
-                <source>${generated.testsources.lite.dir}</source>
-              </sources>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
-      <plugin>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <configuration>
-          <includes>
-            <include>**/AbstractMessageLite.java</include>
-            <include>**/AbstractParser.java</include>
-            <include>**/AbstractProtobufList.java</include>
-            <include>**/BooleanArrayList.java</include>
-            <include>**/ByteString.java</include>
-            <include>**/CodedInputStream.java</include>
-            <include>**/CodedOutputStream.java</include>
-            <include>**/DoubleArrayList.java</include>
-            <include>**/ExtensionLite.java</include>
-            <include>**/ExtensionRegistryLite.java</include>
-            <include>**/FieldSet.java</include>
-            <include>**/FloatArrayList.java</include>
-            <include>**/GeneratedMessageLite.java</include>
-            <include>**/IntArrayList.java</include>
-            <include>**/Internal.java</include>
-            <include>**/InvalidProtocolBufferException.java</include>
-            <include>**/LazyFieldLite.java</include>
-            <include>**/LazyStringArrayList.java</include>
-            <include>**/LazyStringList.java</include>
-            <include>**/LongArrayList.java</include>
-            <include>**/MapEntryLite.java</include>
-            <include>**/MapFieldLite.java</include>
-            <include>**/MessageLite.java</include>
-            <include>**/MessageLiteOrBuilder.java</include>
-            <include>**/MessageLiteToString.java</include>
-            <include>**/MutabilityOracle.java</include>
-            <include>**/NioByteString.java</include>
-            <include>**/Parser.java</include>
-            <include>**/ProtobufArrayList.java</include>
-            <include>**/ProtocolStringList.java</include>
-            <include>**/RopeByteString.java</include>
-            <include>**/SmallSortedMap.java</include>
-            <include>**/TextFormatEscaper.java</include>
-            <include>**/UninitializedMessageException.java</include>
-            <include>**/UnknownFieldSetLite.java</include>
-            <include>**/UnmodifiableLazyStringList.java</include>
-            <include>**/UnsafeByteOperations.java</include>
-            <include>**/Utf8.java</include>
-            <include>**/WireFormat.java</include>
-          </includes>
-          <testIncludes>
-            <testInclude>**/*Lite.java</testInclude>
-            <testInclude>**/BooleanArrayListTest.java</testInclude>
-            <testInclude>**/DoubleArrayListTest.java</testInclude>
-            <testInclude>**/FloatArrayListTest.java</testInclude>
-            <testInclude>**/IntArrayListTest.java</testInclude>
-            <testInclude>**/LazyMessageLiteTest.java</testInclude>
-            <testInclude>**/LiteTest.java</testInclude>
-            <testInclude>**/LongArrayListTest.java</testInclude>
-            <testInclude>**/NioByteStringTest.java</testInclude>
-            <testInclude>**/ProtobufArrayListTest.java</testInclude>
-            <testInclude>**/UnknownFieldSetLiteTest.java</testInclude>
-          </testIncludes>
-        </configuration>
-      </plugin>
-
-      <!-- OSGI bundle configuration -->
-      <plugin>
-        <groupId>org.apache.felix</groupId>
-        <artifactId>maven-bundle-plugin</artifactId>
-        <extensions>true</extensions>
-        <configuration>
-          <instructions>
-            <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
-            <Bundle-SymbolicName>com.google.protobuf</Bundle-SymbolicName>
-            <Export-Package>com.google.${project.artifactId};version=${project.version}</Export-Package>
-          </instructions>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
-
-</project>
diff --git a/java/pom.xml b/java/pom.xml
index f89e4422..f2284918 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -11,7 +11,7 @@
 
   <groupId>com.google.protobuf</groupId>
   <artifactId>protobuf-parent</artifactId>
-  <version>3.2.0</version>
+  <version>3.5.2</version>
   <packaging>pom</packaging>
 
   <name>Protocol Buffers [Parent]</name>
@@ -33,8 +33,6 @@
     <test.proto.dir>src/test/proto</test.proto.dir>
     <generated.sources.dir>${project.build.directory}/generated-sources</generated.sources.dir>
     <generated.testsources.dir>${project.build.directory}/generated-test-sources</generated.testsources.dir>
-    <generated.sources.lite.dir>${project.build.directory}/generated-sources-lite</generated.sources.lite.dir>
-    <generated.testsources.lite.dir>${project.build.directory}/generated-test-sources-lite</generated.testsources.lite.dir>
   </properties>
 
   <licenses>
@@ -84,7 +82,7 @@
       <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
-        <version>18.0</version>
+        <version>19.0</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
@@ -96,8 +94,8 @@
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.6.0</version>
           <configuration>
-            <source>1.6</source>
-            <target>1.6</target>
+            <source>1.7</source>
+            <target>1.7</target>
           </configuration>
         </plugin>
         <plugin>
@@ -208,7 +206,6 @@
 
   <modules>
     <module>core</module>
-    <!-- <module>lite</module> -->
     <module>util</module>
   </modules>
 
diff --git a/java/util/pom.xml b/java/util/pom.xml
index ac771f6e..4e55df0d 100644
--- a/java/util/pom.xml
+++ b/java/util/pom.xml
@@ -6,7 +6,7 @@
   <parent>
     <groupId>com.google.protobuf</groupId>
     <artifactId>protobuf-parent</artifactId>
-    <version>3.2.0</version>
+    <version>3.5.2</version>
   </parent>
 
   <artifactId>protobuf-java-util</artifactId>
diff --git a/java/util/src/main/java/com/google/protobuf/util/Durations.java b/java/util/src/main/java/com/google/protobuf/util/Durations.java
index 46b21828..fb7f4343 100644
--- a/java/util/src/main/java/com/google/protobuf/util/Durations.java
+++ b/java/util/src/main/java/com/google/protobuf/util/Durations.java
@@ -30,7 +30,6 @@
 
 package com.google.protobuf.util;
 
-import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.math.IntMath.checkedAdd;
 import static com.google.common.math.IntMath.checkedSubtract;
 import static com.google.common.math.LongMath.checkedAdd;
@@ -84,6 +83,17 @@ public final class Durations {
   }
 
   /**
+   * Compares two durations. The value returned is identical to what would be returned by:
+   * {@code Durations.comparator().compare(x, y)}.
+   *
+   * @return the value {@code 0} if {@code x == y}; a value less than {@code 0} if {@code x < y};
+   *     and a value greater than {@code 0} if {@code x > y}
+   */
+  public static int compare(Duration x, Duration y) {
+    return COMPARATOR.compare(x, y);
+  }
+
+  /**
    * Returns true if the given {@link Duration} is valid. The {@code seconds} value must be in the
    * range [-315,576,000,000, +315,576,000,000]. The {@code nanos} value must be in the range
    * [-999,999,999, +999,999,999].
@@ -124,14 +134,13 @@ public final class Durations {
   public static Duration checkValid(Duration duration) {
     long seconds = duration.getSeconds();
     int nanos = duration.getNanos();
-    checkArgument(
-        isValid(seconds, nanos),
-        "Duration is not valid. See proto definition for valid values. "
+    if (!isValid(seconds, nanos)) {
+        throw new IllegalArgumentException(String.format(
+            "Duration is not valid. See proto definition for valid values. "
             + "Seconds (%s) must be in range [-315,576,000,000, +315,576,000,000]. "
             + "Nanos (%s) must be in range [-999,999,999, +999,999,999]. "
-            + "Nanos must have the same sign as seconds",
-        seconds,
-        nanos);
+            + "Nanos must have the same sign as seconds", seconds, nanos));
+    }
     return duration;
   }
 
diff --git a/java/util/src/main/java/com/google/protobuf/util/FieldMaskTree.java b/java/util/src/main/java/com/google/protobuf/util/FieldMaskTree.java
index b192b53e..4a13fb1d 100644
--- a/java/util/src/main/java/com/google/protobuf/util/FieldMaskTree.java
+++ b/java/util/src/main/java/com/google/protobuf/util/FieldMaskTree.java
@@ -34,7 +34,6 @@ import com.google.protobuf.Descriptors.Descriptor;
 import com.google.protobuf.Descriptors.FieldDescriptor;
 import com.google.protobuf.FieldMask;
 import com.google.protobuf.Message;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map.Entry;
@@ -244,6 +243,11 @@ final class FieldMaskTree {
                   + "singluar message field and cannot have sub-fields.");
           continue;
         }
+        if (!source.hasField(field) && !destination.hasField(field)) {
+          // If the message field is not present in both source and destination, skip recursing
+          // so we don't create unnecessary empty messages.
+          continue;
+        }
         String childPath = path.isEmpty() ? entry.getKey() : path + "." + entry.getKey();
         merge(
             entry.getValue(),
diff --git a/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java b/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java
index 21d11b2c..b2f849c4 100644
--- a/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java
+++ b/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java
@@ -311,16 +311,19 @@ public class FieldMaskUtil {
       return replacePrimitiveFields;
     }
 
-    public void setReplaceMessageFields(boolean value) {
+    public MergeOptions setReplaceMessageFields(boolean value) {
       replaceMessageFields = value;
+      return this;
     }
 
-    public void setReplaceRepeatedFields(boolean value) {
+    public MergeOptions setReplaceRepeatedFields(boolean value) {
       replaceRepeatedFields = value;
+      return this;
     }
 
-    public void setReplacePrimitiveFields(boolean value) {
+    public MergeOptions setReplacePrimitiveFields(boolean value) {
       replacePrimitiveFields = value;
+      return this;
     }
   }
 
diff --git a/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java b/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java
index ac712c94..7f69ee68 100644
--- a/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java
+++ b/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java
@@ -30,11 +30,13 @@
 
 package com.google.protobuf.util;
 
+import com.google.common.base.Preconditions;
 import com.google.common.io.BaseEncoding;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
+import com.google.gson.JsonIOException;
 import com.google.gson.JsonNull;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
@@ -101,7 +103,9 @@ public class JsonFormat {
    * Creates a {@link Printer} with default configurations.
    */
   public static Printer printer() {
-    return new Printer(TypeRegistry.getEmptyTypeRegistry(), false, false, false);
+    return new Printer(
+        TypeRegistry.getEmptyTypeRegistry(), false, Collections.<FieldDescriptor>emptySet(),
+        false, false, false);
   }
 
   /**
@@ -109,19 +113,33 @@ public class JsonFormat {
    */
   public static class Printer {
     private final TypeRegistry registry;
-    private final boolean includingDefaultValueFields;
+    // NOTE: There are 3 states for these *defaultValueFields variables:
+    // 1) Default - alwaysOutput is false & including is empty set. Fields only output if they are
+    //    set to non-default values.
+    // 2) No-args includingDefaultValueFields() called - alwaysOutput is true & including is
+    //    irrelevant (but set to empty set). All fields are output regardless of their values.
+    // 3) includingDefaultValueFields(Set<FieldDescriptor>) called - alwaysOutput is false &
+    //    including is set to the specified set. Fields in that set are always output & fields not
+    //    in that set are only output if set to non-default values.
+    private boolean alwaysOutputDefaultValueFields;
+    private Set<FieldDescriptor> includingDefaultValueFields;
     private final boolean preservingProtoFieldNames;
     private final boolean omittingInsignificantWhitespace;
+    private final boolean printingEnumsAsInts;
 
     private Printer(
         TypeRegistry registry,
-        boolean includingDefaultValueFields,
+        boolean alwaysOutputDefaultValueFields,
+        Set<FieldDescriptor> includingDefaultValueFields,
         boolean preservingProtoFieldNames,
-        boolean omittingInsignificantWhitespace) {
+        boolean omittingInsignificantWhitespace,
+        boolean printingEnumsAsInts) {
       this.registry = registry;
+      this.alwaysOutputDefaultValueFields = alwaysOutputDefaultValueFields;
       this.includingDefaultValueFields = includingDefaultValueFields;
       this.preservingProtoFieldNames = preservingProtoFieldNames;
       this.omittingInsignificantWhitespace = omittingInsignificantWhitespace;
+      this.printingEnumsAsInts = printingEnumsAsInts;
     }
 
     /**
@@ -136,9 +154,11 @@ public class JsonFormat {
       }
       return new Printer(
           registry,
+          alwaysOutputDefaultValueFields,
           includingDefaultValueFields,
           preservingProtoFieldNames,
-          omittingInsignificantWhitespace);
+          omittingInsignificantWhitespace,
+          printingEnumsAsInts);
     }
 
     /**
@@ -148,8 +168,66 @@ public class JsonFormat {
      * {@link Printer}.
      */
     public Printer includingDefaultValueFields() {
+      checkUnsetIncludingDefaultValueFields();
       return new Printer(
-          registry, true, preservingProtoFieldNames, omittingInsignificantWhitespace);
+          registry,
+          true,
+          Collections.<FieldDescriptor>emptySet(),
+          preservingProtoFieldNames,
+          omittingInsignificantWhitespace,
+          printingEnumsAsInts);
+    }
+
+    /**
+     * Creates a new {@link Printer} that will print enum field values as integers instead of as
+     * string.
+     * The new Printer clones all other configurations from the current
+     * {@link Printer}.
+     */
+    public Printer printingEnumsAsInts() {
+      checkUnsetPrintingEnumsAsInts();
+      return new Printer(
+          registry,
+          alwaysOutputDefaultValueFields,
+          Collections.<FieldDescriptor>emptySet(),
+          preservingProtoFieldNames,
+          omittingInsignificantWhitespace,
+          true);
+    }
+
+    private void checkUnsetPrintingEnumsAsInts() {
+      if (printingEnumsAsInts) {
+        throw new IllegalStateException("JsonFormat printingEnumsAsInts has already been set.");
+      }
+    }
+
+    /**
+     * Creates a new {@link Printer} that will also print default-valued fields if their
+     * FieldDescriptors are found in the supplied set. Empty repeated fields and map fields will be
+     * printed as well, if they match. The new Printer clones all other configurations from the
+     * current {@link Printer}. Call includingDefaultValueFields() with no args to unconditionally
+     * output all fields.
+     */
+    public Printer includingDefaultValueFields(Set<FieldDescriptor> fieldsToAlwaysOutput) {
+      Preconditions.checkArgument(
+          null != fieldsToAlwaysOutput && !fieldsToAlwaysOutput.isEmpty(),
+          "Non-empty Set must be supplied for includingDefaultValueFields.");
+
+      checkUnsetIncludingDefaultValueFields();
+      return new Printer(
+          registry,
+          false,
+          fieldsToAlwaysOutput,
+          preservingProtoFieldNames,
+          omittingInsignificantWhitespace,
+          printingEnumsAsInts);
+    }
+
+    private void checkUnsetIncludingDefaultValueFields() {
+      if (alwaysOutputDefaultValueFields || !includingDefaultValueFields.isEmpty()) {
+        throw new IllegalStateException(
+            "JsonFormat includingDefaultValueFields has already been set.");
+      }
     }
 
     /**
@@ -160,15 +238,21 @@ public class JsonFormat {
      */
     public Printer preservingProtoFieldNames() {
       return new Printer(
-          registry, includingDefaultValueFields, true, omittingInsignificantWhitespace);
+          registry,
+          alwaysOutputDefaultValueFields,
+          includingDefaultValueFields,
+          true,
+          omittingInsignificantWhitespace,
+          printingEnumsAsInts);
     }
 
 
     /**
-     * Create a new  {@link Printer}  that will omit all insignificant whitespace
-     * in the JSON output. This new Printer clones all other configurations from the
-     * current Printer. Insignificant whitespace is defined by the JSON spec as whitespace
-     * that appear between JSON structural elements:
+     * Create a new {@link Printer} that will omit all insignificant whitespace in the JSON output.
+     * This new Printer clones all other configurations from the current Printer. Insignificant
+     * whitespace is defined by the JSON spec as whitespace that appear between JSON structural
+     * elements:
+     *
      * <pre>
      * ws = *(
      * %x20 /              ; Space
@@ -176,18 +260,25 @@ public class JsonFormat {
      * %x0A /              ; Line feed or New line
      * %x0D )              ; Carriage return
      * </pre>
+     *
      * See <a href="https://tools.ietf.org/html/rfc7159">https://tools.ietf.org/html/rfc7159</a>
      * current {@link Printer}.
      */
     public Printer omittingInsignificantWhitespace() {
-      return new Printer(registry, includingDefaultValueFields, preservingProtoFieldNames, true);
+      return new Printer(
+          registry,
+          alwaysOutputDefaultValueFields,
+          includingDefaultValueFields,
+          preservingProtoFieldNames,
+          true,
+          printingEnumsAsInts);
     }
 
     /**
      * Converts a protobuf message to JSON format.
      *
-     * @throws InvalidProtocolBufferException if the message contains Any types
-     *         that can't be resolved.
+     * @throws InvalidProtocolBufferException if the message contains Any types that can't be
+     *     resolved.
      * @throws IOException if writing to the output fails.
      */
     public void appendTo(MessageOrBuilder message, Appendable output) throws IOException {
@@ -195,10 +286,12 @@ public class JsonFormat {
       // mobile.
       new PrinterImpl(
               registry,
+              alwaysOutputDefaultValueFields,
               includingDefaultValueFields,
               preservingProtoFieldNames,
               output,
-              omittingInsignificantWhitespace)
+              omittingInsignificantWhitespace,
+              printingEnumsAsInts)
           .print(message);
     }
 
@@ -355,7 +448,7 @@ public class JsonFormat {
        */
       public Builder add(Iterable<Descriptor> messageTypes) {
         if (types == null) {
-          throw new IllegalStateException("A TypeRegistry.Builer can only be used once.");
+          throw new IllegalStateException("A TypeRegistry.Builder can only be used once.");
         }
         for (Descriptor type : messageTypes) {
           addFile(type.getFile());
@@ -427,19 +520,16 @@ public class JsonFormat {
       this.output = output;
     }
 
-    /**
-     * ignored by compact printer
-     */
+    /** ignored by compact printer */
+    @Override
     public void indent() {}
 
-    /**
-     * ignored by compact printer
-     */
+    /** ignored by compact printer */
+    @Override
     public void outdent() {}
 
-    /**
-     * Print text to the output stream.
-     */
+    /** Print text to the output stream. */
+    @Override
     public void print(final CharSequence text) throws IOException {
       output.append(text);
     }
@@ -457,18 +547,17 @@ public class JsonFormat {
     }
 
     /**
-     * Indent text by two spaces.  After calling Indent(), two spaces will be
-     * inserted at the beginning of each line of text.  Indent() may be called
-     * multiple times to produce deeper indents.
+     * Indent text by two spaces. After calling Indent(), two spaces will be inserted at the
+     * beginning of each line of text. Indent() may be called multiple times to produce deeper
+     * indents.
      */
+    @Override
     public void indent() {
       indent.append("  ");
     }
 
-    /**
-     * Reduces the current indent level by two spaces, or crashes if the indent
-     * level is zero.
-     */
+    /** Reduces the current indent level by two spaces, or crashes if the indent level is zero. */
+    @Override
     public void outdent() {
       final int length = indent.length();
       if (length < 2) {
@@ -477,9 +566,8 @@ public class JsonFormat {
       indent.delete(length - 2, length);
     }
 
-    /**
-     * Print text to the output stream.
-     */
+    /** Print text to the output stream. */
+    @Override
     public void print(final CharSequence text) throws IOException {
       final int size = text.length();
       int pos = 0;
@@ -511,8 +599,10 @@ public class JsonFormat {
    */
   private static final class PrinterImpl {
     private final TypeRegistry registry;
-    private final boolean includingDefaultValueFields;
+    private final boolean alwaysOutputDefaultValueFields;
+    private final Set<FieldDescriptor> includingDefaultValueFields;
     private final boolean preservingProtoFieldNames;
+    private final boolean printingEnumsAsInts;
     private final TextGenerator generator;
     // We use Gson to help handle string escapes.
     private final Gson gson;
@@ -525,13 +615,17 @@ public class JsonFormat {
 
     PrinterImpl(
         TypeRegistry registry,
-        boolean includingDefaultValueFields,
+        boolean alwaysOutputDefaultValueFields,
+        Set<FieldDescriptor> includingDefaultValueFields,
         boolean preservingProtoFieldNames,
         Appendable jsonOutput,
-        boolean omittingInsignificantWhitespace) {
+        boolean omittingInsignificantWhitespace,
+        boolean printingEnumsAsInts) {
       this.registry = registry;
+      this.alwaysOutputDefaultValueFields = alwaysOutputDefaultValueFields;
       this.includingDefaultValueFields = includingDefaultValueFields;
       this.preservingProtoFieldNames = preservingProtoFieldNames;
+      this.printingEnumsAsInts = printingEnumsAsInts;
       this.gson = GsonHolder.DEFAULT_GSON;
       // json format related properties, determined by printerType
       if (omittingInsignificantWhitespace) {
@@ -780,23 +874,26 @@ public class JsonFormat {
         printedField = true;
       }
       Map<FieldDescriptor, Object> fieldsToPrint = null;
-      if (includingDefaultValueFields) {
-        fieldsToPrint = new TreeMap<FieldDescriptor, Object>();
+      if (alwaysOutputDefaultValueFields || !includingDefaultValueFields.isEmpty()) {
+        fieldsToPrint = new TreeMap<FieldDescriptor, Object>(message.getAllFields());
         for (FieldDescriptor field : message.getDescriptorForType().getFields()) {
           if (field.isOptional()) {
             if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE
-                && !message.hasField(field)){
+                && !message.hasField(field)) {
               // Always skip empty optional message fields. If not we will recurse indefinitely if
               // a message has itself as a sub-field.
               continue;
             }
             OneofDescriptor oneof = field.getContainingOneof();
             if (oneof != null && !message.hasField(field)) {
-                // Skip all oneof fields except the one that is actually set
+              // Skip all oneof fields except the one that is actually set
               continue;
             }
           }
-          fieldsToPrint.put(field, message.getField(field));
+          if (!fieldsToPrint.containsKey(field)
+              && (alwaysOutputDefaultValueFields || includingDefaultValueFields.contains(field))) {
+            fieldsToPrint.put(field, message.getField(field));
+          }
         }
       } else {
         fieldsToPrint = message.getAllFields();
@@ -1007,7 +1104,7 @@ public class JsonFormat {
               generator.print("\"");
             }
           } else {
-            if (((EnumValueDescriptor) value).getIndex() == -1) {
+            if (printingEnumsAsInts || ((EnumValueDescriptor) value).getIndex() == -1) {
               generator.print(String.valueOf(((EnumValueDescriptor) value).getNumber()));
             } else {
               generator.print("\"" + ((EnumValueDescriptor) value).getName() + "\"");
@@ -1067,9 +1164,23 @@ public class JsonFormat {
     }
 
     void merge(Reader json, Message.Builder builder) throws IOException {
-      JsonReader reader = new JsonReader(json);
-      reader.setLenient(false);
-      merge(jsonParser.parse(reader), builder);
+      try {
+        JsonReader reader = new JsonReader(json);
+        reader.setLenient(false);
+        merge(jsonParser.parse(reader), builder);
+      } catch (InvalidProtocolBufferException e) {
+        throw e;
+      } catch (JsonIOException e) {
+        // Unwrap IOException.
+        if (e.getCause() instanceof IOException) {
+          throw (IOException) e.getCause();
+        } else {
+          throw new InvalidProtocolBufferException(e.getMessage());
+        }
+      } catch (Exception e) {
+        // We convert all exceptions from JSON parsing to our own exceptions.
+        throw new InvalidProtocolBufferException(e.getMessage());
+      }
     }
 
     void merge(String json, Message.Builder builder) throws InvalidProtocolBufferException {
@@ -1436,45 +1547,6 @@ public class JsonFormat {
       }
     }
 
-    /**
-     * Gets the default value for a field type. Note that we use proto3
-     * language defaults and ignore any default values set through the
-     * proto "default" option.
-     */
-    private Object getDefaultValue(FieldDescriptor field, Message.Builder builder) {
-      switch (field.getType()) {
-        case INT32:
-        case SINT32:
-        case SFIXED32:
-        case UINT32:
-        case FIXED32:
-          return 0;
-        case INT64:
-        case SINT64:
-        case SFIXED64:
-        case UINT64:
-        case FIXED64:
-          return 0L;
-        case FLOAT:
-          return 0.0f;
-        case DOUBLE:
-          return 0.0;
-        case BOOL:
-          return false;
-        case STRING:
-          return "";
-        case BYTES:
-          return ByteString.EMPTY;
-        case ENUM:
-          return field.getEnumType().getValues().get(0);
-        case MESSAGE:
-        case GROUP:
-          return builder.newBuilderForField(field).getDefaultInstanceForType();
-        default:
-          throw new IllegalStateException("Invalid field type: " + field.getType());
-      }
-    }
-
     private void mergeRepeatedField(
         FieldDescriptor field, JsonElement json, Message.Builder builder)
         throws InvalidProtocolBufferException {
@@ -1485,7 +1557,8 @@ public class JsonFormat {
       for (int i = 0; i < array.size(); ++i) {
         Object value = parseFieldValue(field, array.get(i), builder);
         if (value == null) {
-          throw new InvalidProtocolBufferException("Repeated field elements cannot be null");
+          throw new InvalidProtocolBufferException(
+              "Repeated field elements cannot be null in field: " + field.getFullName());
         }
         builder.addRepeatedField(field, value);
       }
@@ -1521,7 +1594,7 @@ public class JsonFormat {
         BigDecimal value = new BigDecimal(json.getAsString());
         return value.longValueExact();
       } catch (Exception e) {
-        throw new InvalidProtocolBufferException("Not an int32 value: " + json);
+        throw new InvalidProtocolBufferException("Not an int64 value: " + json);
       }
     }
 
@@ -1649,7 +1722,11 @@ public class JsonFormat {
     }
 
     private ByteString parseBytes(JsonElement json) throws InvalidProtocolBufferException {
-      return ByteString.copyFrom(BaseEncoding.base64().decode(json.getAsString()));
+      try {
+        return ByteString.copyFrom(BaseEncoding.base64().decode(json.getAsString()));
+      } catch (IllegalArgumentException e) {
+        return ByteString.copyFrom(BaseEncoding.base64Url().decode(json.getAsString()));
+      }
     }
 
     private EnumValueDescriptor parseEnum(EnumDescriptor enumDescriptor, JsonElement json)
diff --git a/java/util/src/main/java/com/google/protobuf/util/Timestamps.java b/java/util/src/main/java/com/google/protobuf/util/Timestamps.java
index 2160e4d5..9e528d4a 100644
--- a/java/util/src/main/java/com/google/protobuf/util/Timestamps.java
+++ b/java/util/src/main/java/com/google/protobuf/util/Timestamps.java
@@ -30,7 +30,6 @@
 
 package com.google.protobuf.util;
 
-import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.math.IntMath.checkedAdd;
 import static com.google.common.math.IntMath.checkedSubtract;
 import static com.google.common.math.LongMath.checkedAdd;
@@ -44,6 +43,7 @@ import java.text.SimpleDateFormat;
 import java.util.Comparator;
 import java.util.Date;
 import java.util.GregorianCalendar;
+import java.util.Locale;
 import java.util.TimeZone;
 
 /**
@@ -74,6 +74,11 @@ public final class Timestamps {
   public static final Timestamp MAX_VALUE =
       Timestamp.newBuilder().setSeconds(TIMESTAMP_SECONDS_MAX).setNanos(999999999).build();
 
+  /**
+   * A constant holding the {@link Timestamp} of epoch time, {@code 1970-01-01T00:00:00.000000000Z}.
+   */
+  public static final Timestamp EPOCH = Timestamp.newBuilder().setSeconds(0).setNanos(0).build();
+
   private static final ThreadLocal<SimpleDateFormat> timestampFormat =
       new ThreadLocal<SimpleDateFormat>() {
         @Override
@@ -83,7 +88,7 @@ public final class Timestamps {
       };
 
   private static SimpleDateFormat createTimestampFormat() {
-    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
+    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss", Locale.ENGLISH);
     GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
     // We use Proleptic Gregorian Calendar (i.e., Gregorian calendar extends
     // backwards to year one) for timestamp formating.
@@ -114,6 +119,17 @@ public final class Timestamps {
   }
 
   /**
+   * Compares two timestamps. The value returned is identical to what would be returned by:
+   * {@code Timestamps.comparator().compare(x, y)}.
+   *
+   * @return the value {@code 0} if {@code x == y}; a value less than {@code 0} if {@code x < y};
+   *     and a value greater than {@code 0} if {@code x > y}
+   */
+  public static int compare(Timestamp x, Timestamp y) {
+    return COMPARATOR.compare(x, y);
+  }
+
+  /**
    * Returns true if the given {@link Timestamp} is valid. The {@code seconds} value must be in the
    * range [-62,135,596,800, +253,402,300,799] (i.e., between 0001-01-01T00:00:00Z and
    * 9999-12-31T23:59:59Z). The {@code nanos} value must be in the range [0, +999,999,999].
@@ -148,13 +164,12 @@ public final class Timestamps {
   public static Timestamp checkValid(Timestamp timestamp) {
     long seconds = timestamp.getSeconds();
     int nanos = timestamp.getNanos();
-    checkArgument(
-        isValid(seconds, nanos),
-        "Timestamp is not valid. See proto definition for valid values. "
+    if (!isValid(seconds, nanos)) {
+        throw new IllegalArgumentException(String.format(
+            "Timestamp is not valid. See proto definition for valid values. "
             + "Seconds (%s) must be in range [-62,135,596,800, +253,402,300,799]. "
-            + "Nanos (%s) must be in range [0, +999,999,999].",
-        seconds,
-        nanos);
+            + "Nanos (%s) must be in range [0, +999,999,999].", seconds, nanos));
+    }
     return timestamp;
   }
 
@@ -296,7 +311,7 @@ public final class Timestamps {
    * Convert a Timestamp to the number of microseconds elapsed from the epoch.
    *
    * <p>The result will be rounded down to the nearest microsecond. E.g., if the timestamp
-   * represents "1969-12-31T23:59:59.999999999Z", it will be rounded to -1 millisecond.
+   * represents "1969-12-31T23:59:59.999999999Z", it will be rounded to -1 microsecond.
    */
   public static long toMicros(Timestamp timestamp) {
     checkValid(timestamp);
@@ -348,10 +363,12 @@ public final class Timestamps {
   static Timestamp normalizedTimestamp(long seconds, int nanos) {
     if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
       seconds = checkedAdd(seconds, nanos / NANOS_PER_SECOND);
-      nanos %= NANOS_PER_SECOND;
+      nanos = (int) (nanos % NANOS_PER_SECOND);
     }
     if (nanos < 0) {
-      nanos += NANOS_PER_SECOND; // no overflow since nanos is negative (and we're adding)
+      nanos =
+          (int)
+              (nanos + NANOS_PER_SECOND); // no overflow since nanos is negative (and we're adding)
       seconds = checkedSubtract(seconds, 1);
     }
     Timestamp timestamp = Timestamp.newBuilder().setSeconds(seconds).setNanos(nanos).build();
@@ -386,11 +403,11 @@ public final class Timestamps {
   static String formatNanos(int nanos) {
     // Determine whether to use 3, 6, or 9 digits for the nano part.
     if (nanos % NANOS_PER_MILLISECOND == 0) {
-      return String.format("%1$03d", nanos / NANOS_PER_MILLISECOND);
+      return String.format(Locale.ENGLISH, "%1$03d", nanos / NANOS_PER_MILLISECOND);
     } else if (nanos % NANOS_PER_MICROSECOND == 0) {
-      return String.format("%1$06d", nanos / NANOS_PER_MICROSECOND);
+      return String.format(Locale.ENGLISH, "%1$06d", nanos / NANOS_PER_MICROSECOND);
     } else {
-      return String.format("%1$09d", nanos);
+      return String.format(Locale.ENGLISH, "%1$09d", nanos);
     }
   }
 }
diff --git a/java/util/src/test/java/com/google/protobuf/util/FieldMaskTreeTest.java b/java/util/src/test/java/com/google/protobuf/util/FieldMaskTreeTest.java
index 3ee0fc6e..853b6151 100644
--- a/java/util/src/test/java/com/google/protobuf/util/FieldMaskTreeTest.java
+++ b/java/util/src/test/java/com/google/protobuf/util/FieldMaskTreeTest.java
@@ -33,7 +33,6 @@ package com.google.protobuf.util;
 import protobuf_unittest.UnittestProto.NestedTestAllTypes;
 import protobuf_unittest.UnittestProto.TestAllTypes;
 import protobuf_unittest.UnittestProto.TestAllTypes.NestedMessage;
-
 import junit.framework.TestCase;
 
 public class FieldMaskTreeTest extends TestCase {
@@ -222,6 +221,13 @@ public class FieldMaskTreeTest extends TestCase {
     new FieldMaskTree().addFieldPath("payload").merge(clearedSource, builder, options);
     assertEquals(false, builder.hasPayload());
 
+    // Skip a message field if they are unset in both source and target.
+    builder = NestedTestAllTypes.newBuilder();
+    new FieldMaskTree()
+        .addFieldPath("payload.optional_int32")
+        .merge(clearedSource, builder, options);
+    assertEquals(false, builder.hasPayload());
+
     // Change to replace message fields.
     options.setReplaceMessageFields(true);
     builder = NestedTestAllTypes.newBuilder();
diff --git a/java/util/src/test/java/com/google/protobuf/util/JsonFormatTest.java b/java/util/src/test/java/com/google/protobuf/util/JsonFormatTest.java
index dafd9bb5..6ef08508 100644
--- a/java/util/src/test/java/com/google/protobuf/util/JsonFormatTest.java
+++ b/java/util/src/test/java/com/google/protobuf/util/JsonFormatTest.java
@@ -34,6 +34,7 @@ import com.google.protobuf.Any;
 import com.google.protobuf.BoolValue;
 import com.google.protobuf.ByteString;
 import com.google.protobuf.BytesValue;
+import com.google.protobuf.Descriptors.FieldDescriptor;
 import com.google.protobuf.DoubleValue;
 import com.google.protobuf.FloatValue;
 import com.google.protobuf.Int32Value;
@@ -62,13 +63,25 @@ import com.google.protobuf.util.JsonTestProto.TestStruct;
 import com.google.protobuf.util.JsonTestProto.TestTimestamp;
 import com.google.protobuf.util.JsonTestProto.TestWrappers;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringReader;
 import java.math.BigDecimal;
 import java.math.BigInteger;
+import java.util.Collections;
 import java.util.HashMap;
-import java.util.Map;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Set;
 import junit.framework.TestCase;
 
 public class JsonFormatTest extends TestCase {
+  public JsonFormatTest() {
+    // Test that locale does not affect JsonFormat.
+    Locale.setDefault(Locale.forLanguageTag("hi-IN"));
+  }
+
   private void setAllFields(TestAllTypes.Builder builder) {
     builder.setOptionalInt32(1234);
     builder.setOptionalInt64(1234567890123456789L);
@@ -219,9 +232,7 @@ public class JsonFormatTest extends TestCase {
 
     TestMap.Builder mapBuilder = TestMap.newBuilder();
     mapBuilder.putInt32ToEnumMapValue(1, 0);
-    Map<Integer, Integer> mapWithInvalidValues = new HashMap<Integer, Integer>();
-    mapWithInvalidValues.put(2, 12345);
-    mapBuilder.putAllInt32ToEnumMapValue(mapWithInvalidValues);
+    mapBuilder.putInt32ToEnumMapValue(2, 12345);
     TestMap mapMessage = mapBuilder.build();
     assertEquals(
         "{\n"
@@ -254,7 +265,7 @@ public class JsonFormatTest extends TestCase {
     assertRoundTripEquals(message);
   }
 
-  public void testParserAcceptStringForNumbericField() throws Exception {
+  public void testParserAcceptStringForNumericField() throws Exception {
     TestAllTypes.Builder builder = TestAllTypes.newBuilder();
     mergeFromJson(
         "{\n"
@@ -274,8 +285,8 @@ public class JsonFormatTest extends TestCase {
     assertEquals(9012, message.getOptionalSint32());
     assertEquals(3456, message.getOptionalFixed32());
     assertEquals(7890, message.getOptionalSfixed32());
-    assertEquals(1.5f, message.getOptionalFloat());
-    assertEquals(1.25, message.getOptionalDouble());
+    assertEquals(1.5f, message.getOptionalFloat(), 0.0f);
+    assertEquals(1.25, message.getOptionalDouble(), 0.0);
     assertEquals(true, message.getOptionalBool());
   }
 
@@ -469,8 +480,8 @@ public class JsonFormatTest extends TestCase {
       TestAllTypes.Builder builder = TestAllTypes.newBuilder();
       mergeFromJson(
           "{\n"
-              + "  \"repeatedNestedMessage\": [null, null],\n"
-              + "  \"repeated_nested_message\": [null, null]\n"
+              + "  \"repeatedInt32\": [1, 2],\n"
+              + "  \"repeated_int32\": [5, 6]\n"
               + "}",
           builder);
       fail();
@@ -478,7 +489,7 @@ public class JsonFormatTest extends TestCase {
       // Exception expected.
     }
 
-    // Duplicated oneof fields.
+    // Duplicated oneof fields, same name.
     try {
       TestOneof.Builder builder = TestOneof.newBuilder();
       mergeFromJson("{\n" + "  \"oneofInt32\": 1,\n" + "  \"oneof_int32\": 2\n" + "}", builder);
@@ -486,6 +497,16 @@ public class JsonFormatTest extends TestCase {
     } catch (InvalidProtocolBufferException e) {
       // Exception expected.
     }
+
+    // Duplicated oneof fields, different name.
+    try {
+      TestOneof.Builder builder = TestOneof.newBuilder();
+      mergeFromJson(
+          "{\n" + "  \"oneofInt32\": 1,\n" + "  \"oneofNullValue\": null\n" + "}", builder);
+      fail();
+    } catch (InvalidProtocolBufferException e) {
+      // Exception expected.
+    }
   }
 
   public void testMapFields() throws Exception {
@@ -1079,7 +1100,7 @@ public class JsonFormatTest extends TestCase {
 
   public void testParserUnexpectedTypeUrl() throws Exception {
     try {
-      TestAllTypes.Builder builder = TestAllTypes.newBuilder();
+      Any.Builder builder = Any.newBuilder();
       mergeFromJson(
           "{\n"
               + "  \"@type\": \"type.googleapis.com/json_test.TestAllTypes\",\n"
@@ -1122,7 +1143,8 @@ public class JsonFormatTest extends TestCase {
   }
 
   public void testParserAcceptBase64Variants() throws Exception {
-    assertAccepts("optionalBytes", "AQI");
+    assertAccepts("optionalBytes", "AQI");  // No padding
+    assertAccepts("optionalBytes", "-_w");  // base64Url, no padding
   }
 
   public void testParserRejectInvalidEnumValue() throws Exception {
@@ -1152,6 +1174,14 @@ public class JsonFormatTest extends TestCase {
     JsonFormat.parser().ignoringUnknownFields().merge(json, builder);
   }
 
+  public void testParserIntegerEnumValue() throws Exception {
+    TestAllTypes.Builder actualBuilder = TestAllTypes.newBuilder();
+    mergeFromJson("{\n" + "  \"optionalNestedEnum\": 2\n" + "}", actualBuilder);
+
+    TestAllTypes expected = TestAllTypes.newBuilder().setOptionalNestedEnum(NestedEnum.BAZ).build();
+    assertEquals(expected, actualBuilder.build());
+  }
+
   public void testCustomJsonName() throws Exception {
     TestCustomJsonName message = TestCustomJsonName.newBuilder().setValue(12345).build();
     assertEquals("{\n" + "  \"@value\": 12345\n" + "}", JsonFormat.printer().print(message));
@@ -1205,6 +1235,115 @@ public class JsonFormatTest extends TestCase {
             + "}",
         JsonFormat.printer().includingDefaultValueFields().print(message));
 
+    Set<FieldDescriptor> fixedFields = new HashSet<FieldDescriptor>();
+    for (FieldDescriptor fieldDesc : TestAllTypes.getDescriptor().getFields()) {
+      if (fieldDesc.getName().contains("_fixed")) {
+        fixedFields.add(fieldDesc);
+      }
+    }
+
+    assertEquals(
+        "{\n"
+            + "  \"optionalFixed32\": 0,\n"
+            + "  \"optionalFixed64\": \"0\",\n"
+            + "  \"repeatedFixed32\": [],\n"
+            + "  \"repeatedFixed64\": []\n"
+            + "}",
+        JsonFormat.printer().includingDefaultValueFields(fixedFields).print(message));
+
+    TestAllTypes messageNonDefaults =
+        message.toBuilder().setOptionalInt64(1234).setOptionalFixed32(3232).build();
+    assertEquals(
+        "{\n"
+            + "  \"optionalInt64\": \"1234\",\n"
+            + "  \"optionalFixed32\": 3232,\n"
+            + "  \"optionalFixed64\": \"0\",\n"
+            + "  \"repeatedFixed32\": [],\n"
+            + "  \"repeatedFixed64\": []\n"
+            + "}",
+        JsonFormat.printer().includingDefaultValueFields(fixedFields).print(messageNonDefaults));
+
+    try {
+      JsonFormat.printer().includingDefaultValueFields().includingDefaultValueFields();
+      fail("IllegalStateException is expected.");
+    } catch (IllegalStateException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    try {
+      JsonFormat.printer().includingDefaultValueFields().includingDefaultValueFields(fixedFields);
+      fail("IllegalStateException is expected.");
+    } catch (IllegalStateException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    try {
+      JsonFormat.printer().includingDefaultValueFields(fixedFields).includingDefaultValueFields();
+      fail("IllegalStateException is expected.");
+    } catch (IllegalStateException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    try {
+      JsonFormat.printer()
+          .includingDefaultValueFields(fixedFields)
+          .includingDefaultValueFields(fixedFields);
+      fail("IllegalStateException is expected.");
+    } catch (IllegalStateException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    Set<FieldDescriptor> intFields = new HashSet<FieldDescriptor>();
+    for (FieldDescriptor fieldDesc : TestAllTypes.getDescriptor().getFields()) {
+      if (fieldDesc.getName().contains("_int")) {
+        intFields.add(fieldDesc);
+      }
+    }
+
+    try {
+      JsonFormat.printer()
+          .includingDefaultValueFields(intFields)
+          .includingDefaultValueFields(fixedFields);
+      fail("IllegalStateException is expected.");
+    } catch (IllegalStateException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    try {
+      JsonFormat.printer().includingDefaultValueFields(null);
+      fail("IllegalArgumentException is expected.");
+    } catch (IllegalArgumentException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
+    try {
+      JsonFormat.printer().includingDefaultValueFields(Collections.<FieldDescriptor>emptySet());
+      fail("IllegalArgumentException is expected.");
+    } catch (IllegalArgumentException e) {
+      // Expected.
+      assertTrue(
+          "Exception message should mention includingDefaultValueFields.",
+          e.getMessage().contains("includingDefaultValueFields"));
+    }
+
     TestMap mapMessage = TestMap.getDefaultInstance();
     assertEquals("{\n}", JsonFormat.printer().print(mapMessage));
     assertEquals(
@@ -1273,16 +1412,17 @@ public class JsonFormatTest extends TestCase {
     assertEquals("{\n}", JsonFormat.printer().includingDefaultValueFields().print(oneofMessage));
 
     oneofMessage = TestOneof.newBuilder().setOneofInt32(42).build();
-    assertEquals("{\n  \"oneofInt32\": 42\n}",
-        JsonFormat.printer().print(oneofMessage));
-    assertEquals("{\n  \"oneofInt32\": 42\n}",
+    assertEquals("{\n  \"oneofInt32\": 42\n}", JsonFormat.printer().print(oneofMessage));
+    assertEquals(
+        "{\n  \"oneofInt32\": 42\n}",
         JsonFormat.printer().includingDefaultValueFields().print(oneofMessage));
 
     TestOneof.Builder oneofBuilder = TestOneof.newBuilder();
     mergeFromJson("{\n" + "  \"oneofNullValue\": null \n" + "}", oneofBuilder);
     oneofMessage = oneofBuilder.build();
     assertEquals("{\n  \"oneofNullValue\": null\n}", JsonFormat.printer().print(oneofMessage));
-    assertEquals("{\n  \"oneofNullValue\": null\n}",
+    assertEquals(
+        "{\n  \"oneofNullValue\": null\n}",
         JsonFormat.printer().includingDefaultValueFields().print(oneofMessage));
   }
 
@@ -1309,6 +1449,13 @@ public class JsonFormatTest extends TestCase {
     assertEquals(54321, builder.getOptionalInt32());
   }
 
+  public void testPrintingEnumsAsInts() throws Exception {
+    TestAllTypes message = TestAllTypes.newBuilder().setOptionalNestedEnum(NestedEnum.BAR).build();
+    assertEquals(
+        "{\n" + "  \"optionalNestedEnum\": 1\n" + "}",
+        JsonFormat.printer().printingEnumsAsInts().print(message));
+  }
+
   public void testOmittingInsignificantWhiteSpace() throws Exception {
     TestAllTypes message = TestAllTypes.newBuilder().setOptionalInt32(12345).build();
     assertEquals(
@@ -1411,4 +1558,35 @@ public class JsonFormatTest extends TestCase {
       // Expected.
     }
   }
+
+  // Test that we are not leaking out JSON exceptions.
+  public void testJsonException() throws Exception {
+    InputStream throwingInputStream =
+        new InputStream() {
+          public int read() throws IOException {
+            throw new IOException("12345");
+          }
+        };
+    InputStreamReader throwingReader = new InputStreamReader(throwingInputStream);
+    // When the underlying reader throws IOException, JsonFormat should forward
+    // through this IOException.
+    try {
+      TestAllTypes.Builder builder = TestAllTypes.newBuilder();
+      JsonFormat.parser().merge(throwingReader, builder);
+      fail("Exception is expected.");
+    } catch (IOException e) {
+      assertEquals("12345", e.getMessage());
+    }
+
+    Reader invalidJsonReader = new StringReader("{ xxx - yyy }");
+    // When the JSON parser throws parser exceptions, JsonFormat should turn
+    // that into InvalidProtocolBufferException.
+    try {
+      TestAllTypes.Builder builder = TestAllTypes.newBuilder();
+      JsonFormat.parser().merge(invalidJsonReader, builder);
+      fail("Exception is expected.");
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+  }
 }
diff --git a/java/util/src/test/proto/com/google/protobuf/util/json_test.proto b/java/util/src/test/proto/com/google/protobuf/util/json_test.proto
index a75338ef..d1248cfb 100644
--- a/java/util/src/test/proto/com/google/protobuf/util/json_test.proto
+++ b/java/util/src/test/proto/com/google/protobuf/util/json_test.proto
@@ -28,36 +28,6 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
 syntax = "proto3";
 
 package json_test;
diff --git a/javanano/README.md b/javanano/README.md
deleted file mode 100644
index e19b90b1..00000000
--- a/javanano/README.md
+++ /dev/null
@@ -1,398 +0,0 @@
-Protocol Buffers - Google's data interchange format
-===================================================
-
-[![Build Status](https://travis-ci.org/google/protobuf.svg?branch=master)](https://travis-ci.org/google/protobuf)
-
-Copyright 2008 Google Inc.
-
-This directory contains the Java Protocol Buffers Nano runtime library.
-
-Installation - With Maven
--------------------------
-
-The Protocol Buffers build is managed using Maven.  If you would
-rather build without Maven, see below.
-
-1) Install Apache Maven if you don't have it:
-
-     http://maven.apache.org/
-
-2) Build the C++ code, or obtain a binary distribution of protoc.  If
-   you install a binary distribution, make sure that it is the same
-   version as this package.  If in doubt, run:
-
-     $ protoc --version
-
-   You will need to place the protoc executable in ../src.  (If you
-   built it yourself, it should already be there.)
-
-3) Run the tests:
-
-     $ mvn test
-
-   If some tests fail, this library may not work correctly on your
-   system.  Continue at your own risk.
-
-4) Install the library into your Maven repository:
-
-     $ mvn install
-
-5) If you do not use Maven to manage your own build, you can build a
-   .jar file to use:
-
-     $ mvn package
-
-   The .jar will be placed in the "target" directory.
-
-Installation - Without Maven
-----------------------------
-
-If you would rather not install Maven to build the library, you may
-follow these instructions instead.  Note that these instructions skip
-running unit tests.
-
-1) Build the C++ code, or obtain a binary distribution of protoc.  If
-   you install a binary distribution, make sure that it is the same
-   version as this package.  If in doubt, run:
-
-     $ protoc --version
-
-   If you built the C++ code without installing, the compiler binary
-   should be located in ../src.
-
-2) Invoke protoc to build DescriptorProtos.java:
-
-     $ protoc --java_out=src/main/java -I../src \
-         ../src/google/protobuf/descriptor.proto
-
-3) Compile the code in src/main/java using whatever means you prefer.
-
-4) Install the classes wherever you prefer.
-
-Nano version
-------------
-
-JavaNano is a special code generator and runtime library designed specially for
-resource-restricted systems, like Android. It is very resource-friendly in both
-the amount of code and the runtime overhead. Here is an overview of JavaNano
-features compared with the official Java protobuf:
-
-- No descriptors or message builders.
-- All messages are mutable; fields are public Java fields.
-- For optional fields only, encapsulation behind setter/getter/hazzer/
-  clearer functions is opt-in, which provide proper 'has' state support.
-- For proto2, if not opted in, has state (field presence) is not available.
-  Serialization outputs all fields not equal to their defaults
-  (see important implications below).
-  The behavior is consistent with proto3 semantics.
-- Required fields (proto2 only) are always serialized.
-- Enum constants are integers; protection against invalid values only
-  when parsing from the wire.
-- Enum constants can be generated into container interfaces bearing
-  the enum's name (so the referencing code is in Java style).
-- CodedInputByteBufferNano can only take byte[] (not InputStream).
-- Similarly CodedOutputByteBufferNano can only write to byte[].
-- Repeated fields are in arrays, not ArrayList or Vector. Null array
-  elements are allowed and silently ignored.
-- Full support for serializing/deserializing repeated packed fields.
-- Support  extensions (in proto2).
-- Unset messages/groups are null, not an immutable empty default
-  instance.
-- toByteArray(...) and mergeFrom(...) are now static functions of
-  MessageNano.
-- The 'bytes' type translates to the Java type byte[].
-
-The generated messages are not thread-safe for writes, but may be
-used simultaneously from multiple threads in a read-only manner.
-In other words, an appropriate synchronization mechanism (such as
-a ReadWriteLock) must be used to ensure that a message, its
-ancestors, and descendants are not accessed by any other threads
-while the message is being modified. Field reads, getter methods
-(but not getExtension(...)), toByteArray(...), writeTo(...),
-getCachedSize(), and getSerializedSize() are all considered read-only
-operations.
-
-IMPORTANT: If you have fields with defaults and opt out of accessors
-
-How fields with defaults are serialized has changed. Because we don't
-keep "has" state, any field equal to its default is assumed to be not
-set and therefore is not serialized. Consider the situation where we
-change the default value of a field. Senders compiled against an older
-version of the proto continue to match against the old default, and
-don't send values to the receiver even though the receiver assumes the
-new default value. Therefore, think carefully about the implications
-of changing the default value. Alternatively, turn on accessors and
-enjoy the benefit of the explicit has() checks.
-
-IMPORTANT: If you have "bytes" fields with non-empty defaults
-
-Because the byte buffer is now of mutable type byte[], the default
-static final cannot be exposed through a public field. Each time a
-message's constructor or clear() function is called, the default value
-(kept in a private byte[]) is cloned. This causes a small memory
-penalty. This is not a problem if the field has no default or is an
-empty default.
-
-Nano Generator options
-----------------------
-
-```
-java_package           -> <file-name>|<package-name>
-java_outer_classname   -> <file-name>|<package-name>
-java_multiple_files    -> true or false
-java_nano_generate_has -> true or false [DEPRECATED]
-optional_field_style   -> default or accessors
-enum_style             -> c or java
-ignore_services        -> true or false
-parcelable_messages    -> true or false
-generate_intdefs       -> true or false
-```
-
-**java_package=\<file-name\>|\<package-name\>** (no default)
-
-  This allows overriding the 'java_package' option value
-  for the given file from the command line. Use multiple
-  java_package options to override the option for multiple
-  files. The final Java package for each file is the value
-  of this command line option if present, or the value of
-  the same option defined in the file if present, or the
-  proto package if present, or the default Java package.
-
-**java_outer_classname=\<file-name\>|\<outer-classname\>** (no default)
-
-  This allows overriding the 'java_outer_classname' option
-  for the given file from the command line. Use multiple
-  java_outer_classname options to override the option for
-  multiple files. The final Java outer class name for each
-  file is the value of this command line option if present,
-  or the value of the same option defined in the file if
-  present, or the file name converted to CamelCase. This
-  outer class will nest all classes and integer constants
-  generated from file-scope messages and enums.
-
-**java_multiple_files={true,false}** (no default)
-
-  This allows overriding the 'java_multiple_files' option
-  in all source files and their imported files from the
-  command line. The final value of this option for each
-  file is the value defined in this command line option, or
-  the value of the same option defined in the file if
-  present, or false. This specifies whether to generate
-  package-level classes for the file-scope messages in the
-  same Java package as the outer class (instead of nested
-  classes in the outer class). File-scope enum constants
-  are still generated as integer constants in the outer
-  class. This affects the fully qualified references in the
-  Java code. NOTE: because the command line option
-  overrides the value for all files and their imported
-  files, using this option inconsistently may result in
-  incorrect references to the imported messages and enum
-  constants.
-
-**java_nano_generate_has={true,false}** (default: false)
-
-  DEPRECATED. Use optional_field_style=accessors.
-
-  If true, generates a public boolean variable has\<fieldname\>
-  accompanying each optional or required field (not present for
-  repeated fields, groups or messages). It is set to false initially
-  and upon clear(). If parseFrom(...) reads the field from the wire,
-  it is set to true. This is a way for clients to inspect the "has"
-  value upon parse. If it is set to true, writeTo(...) will ALWAYS
-  output that field (even if field value is equal to its
-  default).
-
-  IMPORTANT: This option costs an extra 4 bytes per primitive field in
-  the message. Think carefully about whether you really need this. In
-  many cases reading the default works and determining whether the
-  field was received over the wire is irrelevant.
-
-**optional_field_style={default,accessors,reftypes}** (default: default)
-
-  Defines the style of the generated code for fields.
-
-  * default
-
-  In the default style, optional fields translate into public mutable
-  Java fields, and the serialization process is as discussed in the
-  "IMPORTANT" section above.
-
-  * accessors
-
-  When set to 'accessors', each optional field is encapsulated behind
-  4 accessors, namely get\<fieldname\>(), set\<fieldname\>(), has\<fieldname\>()
-  and clear\<fieldname\>() methods, with the standard semantics. The hazzer's
-  return value determines whether a field is serialized, so this style is
-  useful when you need to serialize a field with the default value, or check
-  if a field has been explicitly set to its default value from the wire.
-
-  In the 'accessors' style, required and nested message fields are still
-  translated to one public mutable Java field each, repeated fields are still
-  translated to arrays. No accessors are generated for them.
-
-  IMPORTANT: When using the 'accessors' style, ProGuard should always
-  be enabled with optimization (don't use -dontoptimize) and allowing
-  access modification (use -allowaccessmodification). This removes the
-  unused accessors and maybe inline the rest at the call sites,
-  reducing the final code size.
-  TODO(maxtroy): find ProGuard config that would work the best.
-
-  * reftypes
-
-  When set to 'reftypes', each proto field is generated as a public Java
-  field. For primitive types, these fields use the Java reference types
-  such as java.lang.Integer instead of primitive types such as int.
-
-  In the 'reftypes' style, fields are initialized to null (or empty
-  arrays for repeated fields), and their default values are not available.
-  They are serialized over the wire based on equality to null.
-
-  The 'reftypes' mode has some additional cost due to autoboxing and usage
-  of reference types. In practice, many boxed types are cached, and so don't
-  result in object creation. However, references do take slightly more memory
-  than primitives.
-
-  The 'reftypes' mode is useful when you want to be able to serialize fields
-  with default values, or check if a field has been explicitly set to the
-  default over the wire without paying the extra method cost of the
-  'accessors' mode.
-
-  Note that if you attempt to write null to a required field in the reftypes
-  mode, serialization of the proto will cause a NullPointerException. This is
-  an intentional indicator that you must set required fields.
-
-  NOTE
-  optional_field_style=accessors or reftypes cannot be used together with
-  java_nano_generate_has=true. If you need the 'has' flag for any
-  required field (you have no reason to), you can only use
-  java_nano_generate_has=true.
-
-**enum_style={c,java}** (default: c)
-
-  Defines where to put the int constants generated from enum members.
-
-  * c
-
-  Use C-style, so the enum constants are available at the scope where
-  the enum is defined. A file-scope enum's members are referenced like
-  'FileOuterClass.ENUM_VALUE'; a message-scope enum's members are
-  referenced as 'Message.ENUM_VALUE'. The enum name is unavailable.
-  This complies with the Micro code generator's behavior.
-
-  * java
-
-  Use Java-style, so the enum constants are available under the enum
-  name and referenced like 'EnumName.ENUM_VALUE' (they are still int
-  constants). The enum name becomes the name of a public interface, at
-  the scope where the enum is defined. If the enum is file-scope and
-  the java_multiple_files option is on, the interface will be defined
-  in its own file. To reduce code size, this interface should not be
-  implemented and ProGuard shrinking should be used, so after the Java
-  compiler inlines all referenced enum constants into the call sites,
-  the interface remains unused and can be removed by ProGuard.
-
-**ignore_services={true,false}** (default: false)
-
-  Skips services definitions.
-
-  Nano doesn't support services. By default, if a service is defined
-  it will generate a compilation error. If this flag is set to true,
-  services will be silently ignored, instead.
-
-**parcelable_messages={true,false}** (default: false)
-
-  Android-specific option to generate Parcelable messages.
-
-**generate_intdefs={true,false}** (default: false)
-  Android-specific option to generate @IntDef annotations for enums.
-
-  If turned on, an '@IntDef' annotation (a public @interface) will be
-  generated for each enum, and every integer parameter and return
-  value in the generated code meant for this enum will be annotated
-  with it. This interface is generated with the same name and at the
-  same place as the enum members' container interfaces described
-  above under 'enum_style=java', regardless of the enum_style option
-  used. When this is combined with enum_style=java, the interface
-  will be both the '@IntDef' annotation and the container of the enum
-  members; otherwise the interface has an empty body.
-
-  Your app must declare a compile-time dependency on the
-  android-support-annotations library.
-
-  For more information on how these @IntDef annotations help with
-  compile-time type safety, see:
-  https://sites.google.com/a/android.com/tools/tech-docs/support-annotations
-  and
-  https://developer.android.com/reference/android/support/annotation/IntDef.html
-
-
-To use nano protobufs within the Android repo:
-----------------------------------------------
-
-- Set 'LOCAL_PROTOC_OPTIMIZE_TYPE := nano' in your local .mk file.
-  When building a Java library or an app (package) target, the build
-  system will add the Java nano runtime library to the
-  LOCAL_STATIC_JAVA_LIBRARIES variable, so you don't need to.
-- Set 'LOCAL_PROTO_JAVA_OUTPUT_PARAMS := ...' in your local .mk file
-  for any command-line options you need. Use commas to join multiple
-  options. In the nano flavor only, whitespace surrounding the option
-  names and values are ignored, so you can use backslash-newline or
-  '+=' to structure your make files nicely.
-- The options will be applied to *all* proto files in LOCAL_SRC_FILES
-  when you build a Java library or package. In case different options
-  are needed for different proto files, build separate Java libraries
-  and reference them in your main target. Note: you should make sure
-  that, for each separate target, all proto files imported from any
-  proto file in LOCAL_SRC_FILES are included in LOCAL_SRC_FILES. This
-  is because the generator has to assume that the imported files are
-  built using the same options, and will generate code that reference
-  the fields and enums from the imported files using the same code
-  style.
-- Hint: 'include $(CLEAR_VARS)' resets all LOCAL_ variables, including
-  the two above.
-
-To use nano protobufs outside of Android repo:
-----------------------------------------------
-
-- Link with the generated jar file
-  \<protobuf-root\>java/target/protobuf-java-2.3.0-nano.jar.
-- Invoke with --javanano_out, e.g.:
-```
-./protoc '--javanano_out=\
-    java_package=src/proto/simple-data.proto|my_package,\
-    java_outer_classname=src/proto/simple-data.proto|OuterName\
-  :.' src/proto/simple-data.proto
-```
-
-Contributing to nano:
----------------------
-
-Please add/edit tests in NanoTest.java.
-
-Please run the following steps to test:
-
-- cd external/protobuf
-- ./configure
-- Run "make -j12 check" and verify all tests pass.
-- cd java
-- Run "mvn test" and verify all tests pass.
-- cd ../../..
-- . build/envsetup.sh
-- lunch 1
-- "make -j12 aprotoc libprotobuf-java-2.3.0-nano aprotoc-test-nano-params NanoAndroidTest" and
-  check for build errors.
-- Plug in an Android device or start an emulator.
-- adb install -r out/target/product/generic/data/app/NanoAndroidTest.apk
-- Run:
-  "adb shell am instrument -w com.google.protobuf.nano.test/android.test.InstrumentationTestRunner"
-  and verify all tests pass.
-- repo sync -c -j256
-- "make -j12" and check for build errors
-
-Usage
------
-
-The complete documentation for Protocol Buffers is available via the
-web at:
-
-    https://developers.google.com/protocol-buffers/
diff --git a/javanano/pom.xml b/javanano/pom.xml
deleted file mode 100644
index 0395e8f2..00000000
--- a/javanano/pom.xml
+++ /dev/null
@@ -1,244 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>com.google</groupId>
-    <artifactId>google</artifactId>
-    <version>1</version>
-  </parent>
-  <groupId>com.google.protobuf.nano</groupId>
-  <artifactId>protobuf-javanano</artifactId>
-  <version>3.2.0</version>
-  <packaging>bundle</packaging>
-  <name>Protocol Buffer JavaNano API</name>
-  <description>
-    Protocol Buffers are a way of encoding structured data in an efficient yet
-    extensible format.
-  </description>
-  <inceptionYear>2008</inceptionYear>
-  <url>https://developers.google.com/protocol-buffers/</url>
-  <licenses>
-    <license>
-      <name>3-Clause BSD License</name>
-      <url>https://opensource.org/licenses/BSD-3-Clause</url>
-      <distribution>repo</distribution>
-    </license>
-  </licenses>
-  <scm>
-    <url>https://github.com/google/protobuf</url>
-    <connection>
-      scm:git:https://github.com/google/protobuf.git
-    </connection>
-  </scm>
-  <properties>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-  </properties>
-  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>4.4</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.easymock</groupId>
-      <artifactId>easymock</artifactId>
-      <version>2.2</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.easymock</groupId>
-      <artifactId>easymockclassextension</artifactId>
-      <version>2.2.1</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
-  <build>
-    <plugins>
-      <plugin>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <configuration>
-          <source>1.5</source>
-          <target>1.5</target>
-        </configuration>
-      </plugin>
-      <plugin>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <configuration>
-          <includes>
-            <include>**/*Test.java</include>
-          </includes>
-        </configuration>
-      </plugin>
-      <plugin>
-        <artifactId>maven-antrun-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>generate-test-sources</id>
-            <phase>generate-test-sources</phase>
-            <configuration>
-              <tasks>
-                <mkdir dir="target/generated-test-sources" />
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=generate_equals=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_simple_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_import_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_single_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/map_test.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=store_unknown_fields=true,generate_equals=true,generate_clone=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=store_unknown_fields=true,generate_clone=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=java_nano_generate_has=true,generate_equals=true,generate_clone=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_has_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=optional_field_style=accessors,generate_equals=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=enum_style=java:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=
-                                  optional_field_style=accessors,
-                                  java_outer_classname=google/protobuf/nano/unittest_enum_validity_nano.proto|EnumValidityAccessors
-                                :target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=optional_field_style=reftypes,generate_equals=true:target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto" />
-                </exec>
-                <exec executable="../src/protoc">
-                  <arg value="--javanano_out=
-                                  optional_field_style=reftypes_compat_mode,
-                                  generate_equals=true,
-                                  java_outer_classname=google/protobuf/nano/unittest_reference_types_nano.proto|NanoReferenceTypesCompat
-                                  :target/generated-test-sources" />
-                  <arg value="--proto_path=src/test/java/com" />
-                  <arg value="src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto" />
-                </exec>
-              </tasks>
-              <testSourceRoot>target/generated-test-sources</testSourceRoot>
-            </configuration>
-            <goals>
-              <goal>run</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-      <plugin>
-        <groupId>org.apache.felix</groupId>
-        <artifactId>maven-bundle-plugin</artifactId>
-        <extensions>true</extensions>
-        <configuration>
-          <instructions>
-            <Bundle-DocURL>https://developers.google.com/protocol-buffers/</Bundle-DocURL>
-            <Bundle-SymbolicName>com.google.protobuf.nano</Bundle-SymbolicName>
-            <Export-Package>com.google.protobuf.nano;version=3.0.0-alpha-7</Export-Package>
-          </instructions>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
-  <profiles>
-    <profile>
-      <id>release</id>
-      <distributionManagement>
-        <snapshotRepository>
-          <id>sonatype-nexus-staging</id>
-          <url>https://oss.sonatype.org/content/repositories/snapshots</url>
-        </snapshotRepository>
-        <repository>
-          <id>sonatype-nexus-staging</id>
-          <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
-        </repository>
-      </distributionManagement>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-source-plugin</artifactId>
-            <version>2.2.1</version>
-            <executions>
-              <execution>
-                <id>attach-sources</id>
-                <goals>
-                  <goal>jar-no-fork</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-javadoc-plugin</artifactId>
-            <version>2.9.1</version>
-            <executions>
-              <execution>
-                <id>attach-javadocs</id>
-                <goals>
-                  <goal>jar</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.5</version>
-            <executions>
-              <execution>
-                <id>sign-artifacts</id>
-                <phase>verify</phase>
-                <goals>
-                  <goal>sign</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-          <plugin>
-            <groupId>org.sonatype.plugins</groupId>
-            <artifactId>nexus-staging-maven-plugin</artifactId>
-            <version>1.6.3</version>
-            <extensions>true</extensions>
-            <configuration>
-               <serverId>sonatype-nexus-staging</serverId>
-               <nexusUrl>https://oss.sonatype.org/</nexusUrl>
-               <autoReleaseAfterClose>false</autoReleaseAfterClose>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-  </profiles>
-</project>
diff --git a/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java b/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java
deleted file mode 100644
index f3993155..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/CodedInputByteBufferNano.java
+++ /dev/null
@@ -1,683 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-
-/**
- * Reads and decodes protocol message fields.
- *
- * This class contains two kinds of methods:  methods that read specific
- * protocol message constructs and field types (e.g. {@link #readTag()} and
- * {@link #readInt32()}) and methods that read low-level values (e.g.
- * {@link #readRawVarint32()} and {@link #readRawBytes}).  If you are reading
- * encoded protocol messages, you should use the former methods, but if you are
- * reading some other format of your own design, use the latter.
- *
- * @author kenton@google.com Kenton Varda
- */
-public final class CodedInputByteBufferNano {
-  /**
-   * Create a new CodedInputStream wrapping the given byte array.
-   */
-  public static CodedInputByteBufferNano newInstance(final byte[] buf) {
-    return newInstance(buf, 0, buf.length);
-  }
-
-  /**
-   * Create a new CodedInputStream wrapping the given byte array slice.
-   */
-  public static CodedInputByteBufferNano newInstance(final byte[] buf, final int off,
-                                             final int len) {
-    return new CodedInputByteBufferNano(buf, off, len);
-  }
-
-  // -----------------------------------------------------------------
-
-  /**
-   * Attempt to read a field tag, returning zero if we have reached EOF.
-   * Protocol message parsers use this to read tags, since a protocol message
-   * may legally end wherever a tag occurs, and zero is not a valid tag number.
-   */
-  public int readTag() throws IOException {
-    if (isAtEnd()) {
-      lastTag = 0;
-      return 0;
-    }
-
-    lastTag = readRawVarint32();
-    if (lastTag == 0) {
-      // If we actually read zero, that's not a valid tag.
-      throw InvalidProtocolBufferNanoException.invalidTag();
-    }
-    return lastTag;
-  }
-
-  /**
-   * Verifies that the last call to readTag() returned the given tag value.
-   * This is used to verify that a nested group ended with the correct
-   * end tag.
-   *
-   * @throws InvalidProtocolBufferNanoException {@code value} does not match the
-   *                                        last tag.
-   */
-  public void checkLastTagWas(final int value)
-                              throws InvalidProtocolBufferNanoException {
-    if (lastTag != value) {
-      throw InvalidProtocolBufferNanoException.invalidEndTag();
-    }
-  }
-
-  /**
-   * Reads and discards a single field, given its tag value.
-   *
-   * @return {@code false} if the tag is an endgroup tag, in which case
-   *         nothing is skipped.  Otherwise, returns {@code true}.
-   */
-  public boolean skipField(final int tag) throws IOException {
-    switch (WireFormatNano.getTagWireType(tag)) {
-      case WireFormatNano.WIRETYPE_VARINT:
-        readInt32();
-        return true;
-      case WireFormatNano.WIRETYPE_FIXED64:
-        readRawLittleEndian64();
-        return true;
-      case WireFormatNano.WIRETYPE_LENGTH_DELIMITED:
-        skipRawBytes(readRawVarint32());
-        return true;
-      case WireFormatNano.WIRETYPE_START_GROUP:
-        skipMessage();
-        checkLastTagWas(
-          WireFormatNano.makeTag(WireFormatNano.getTagFieldNumber(tag),
-                             WireFormatNano.WIRETYPE_END_GROUP));
-        return true;
-      case WireFormatNano.WIRETYPE_END_GROUP:
-        return false;
-      case WireFormatNano.WIRETYPE_FIXED32:
-        readRawLittleEndian32();
-        return true;
-      default:
-        throw InvalidProtocolBufferNanoException.invalidWireType();
-    }
-  }
-
-  /**
-   * Reads and discards an entire message.  This will read either until EOF
-   * or until an endgroup tag, whichever comes first.
-   */
-  public void skipMessage() throws IOException {
-    while (true) {
-      final int tag = readTag();
-      if (tag == 0 || !skipField(tag)) {
-        return;
-      }
-    }
-  }
-
-  // -----------------------------------------------------------------
-
-  /** Read a {@code double} field value from the stream. */
-  public double readDouble() throws IOException {
-    return Double.longBitsToDouble(readRawLittleEndian64());
-  }
-
-  /** Read a {@code float} field value from the stream. */
-  public float readFloat() throws IOException {
-    return Float.intBitsToFloat(readRawLittleEndian32());
-  }
-
-  /** Read a {@code uint64} field value from the stream. */
-  public long readUInt64() throws IOException {
-    return readRawVarint64();
-  }
-
-  /** Read an {@code int64} field value from the stream. */
-  public long readInt64() throws IOException {
-    return readRawVarint64();
-  }
-
-  /** Read an {@code int32} field value from the stream. */
-  public int readInt32() throws IOException {
-    return readRawVarint32();
-  }
-
-  /** Read a {@code fixed64} field value from the stream. */
-  public long readFixed64() throws IOException {
-    return readRawLittleEndian64();
-  }
-
-  /** Read a {@code fixed32} field value from the stream. */
-  public int readFixed32() throws IOException {
-    return readRawLittleEndian32();
-  }
-
-  /** Read a {@code bool} field value from the stream. */
-  public boolean readBool() throws IOException {
-    return readRawVarint32() != 0;
-  }
-
-  /** Read a {@code string} field value from the stream. */
-  public String readString() throws IOException {
-    final int size = readRawVarint32();
-    if (size <= (bufferSize - bufferPos) && size > 0) {
-      // Fast path:  We already have the bytes in a contiguous buffer, so
-      //   just copy directly from it.
-      final String result = new String(buffer, bufferPos, size, InternalNano.UTF_8);
-      bufferPos += size;
-      return result;
-    } else {
-      // Slow path:  Build a byte array first then copy it.
-      return new String(readRawBytes(size), InternalNano.UTF_8);
-    }
-  }
-
-  /** Read a {@code group} field value from the stream. */
-  public void readGroup(final MessageNano msg, final int fieldNumber)
-      throws IOException {
-    if (recursionDepth >= recursionLimit) {
-      throw InvalidProtocolBufferNanoException.recursionLimitExceeded();
-    }
-    ++recursionDepth;
-    msg.mergeFrom(this);
-    checkLastTagWas(
-      WireFormatNano.makeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP));
-    --recursionDepth;
-  }
-
-  public void readMessage(final MessageNano msg)
-      throws IOException {
-    final int length = readRawVarint32();
-    if (recursionDepth >= recursionLimit) {
-      throw InvalidProtocolBufferNanoException.recursionLimitExceeded();
-    }
-    final int oldLimit = pushLimit(length);
-    ++recursionDepth;
-    msg.mergeFrom(this);
-    checkLastTagWas(0);
-    --recursionDepth;
-    popLimit(oldLimit);
-  }
-
-  /** Read a {@code bytes} field value from the stream. */
-  public byte[] readBytes() throws IOException {
-    final int size = readRawVarint32();
-    if (size <= (bufferSize - bufferPos) && size > 0) {
-      // Fast path:  We already have the bytes in a contiguous buffer, so
-      //   just copy directly from it.
-      final byte[] result = new byte[size];
-      System.arraycopy(buffer, bufferPos, result, 0, size);
-      bufferPos += size;
-      return result;
-    } else if (size == 0) {
-      return WireFormatNano.EMPTY_BYTES;
-    } else {
-      // Slow path:  Build a byte array first then copy it.
-      return readRawBytes(size);
-    }
-  }
-
-  /** Read a {@code uint32} field value from the stream. */
-  public int readUInt32() throws IOException {
-    return readRawVarint32();
-  }
-
-  /**
-   * Read an enum field value from the stream.  Caller is responsible
-   * for converting the numeric value to an actual enum.
-   */
-  public int readEnum() throws IOException {
-    return readRawVarint32();
-  }
-
-  /** Read an {@code sfixed32} field value from the stream. */
-  public int readSFixed32() throws IOException {
-    return readRawLittleEndian32();
-  }
-
-  /** Read an {@code sfixed64} field value from the stream. */
-  public long readSFixed64() throws IOException {
-    return readRawLittleEndian64();
-  }
-
-  /** Read an {@code sint32} field value from the stream. */
-  public int readSInt32() throws IOException {
-    return decodeZigZag32(readRawVarint32());
-  }
-
-  /** Read an {@code sint64} field value from the stream. */
-  public long readSInt64() throws IOException {
-    return decodeZigZag64(readRawVarint64());
-  }
-
-  // =================================================================
-
-  /**
-   * Read a raw Varint from the stream.  If larger than 32 bits, discard the
-   * upper bits.
-   */
-  public int readRawVarint32() throws IOException {
-    byte tmp = readRawByte();
-    if (tmp >= 0) {
-      return tmp;
-    }
-    int result = tmp & 0x7f;
-    if ((tmp = readRawByte()) >= 0) {
-      result |= tmp << 7;
-    } else {
-      result |= (tmp & 0x7f) << 7;
-      if ((tmp = readRawByte()) >= 0) {
-        result |= tmp << 14;
-      } else {
-        result |= (tmp & 0x7f) << 14;
-        if ((tmp = readRawByte()) >= 0) {
-          result |= tmp << 21;
-        } else {
-          result |= (tmp & 0x7f) << 21;
-          result |= (tmp = readRawByte()) << 28;
-          if (tmp < 0) {
-            // Discard upper 32 bits.
-            for (int i = 0; i < 5; i++) {
-              if (readRawByte() >= 0) {
-                return result;
-              }
-            }
-            throw InvalidProtocolBufferNanoException.malformedVarint();
-          }
-        }
-      }
-    }
-    return result;
-  }
-
-  /** Read a raw Varint from the stream. */
-  public long readRawVarint64() throws IOException {
-    int shift = 0;
-    long result = 0;
-    while (shift < 64) {
-      final byte b = readRawByte();
-      result |= (long)(b & 0x7F) << shift;
-      if ((b & 0x80) == 0) {
-        return result;
-      }
-      shift += 7;
-    }
-    throw InvalidProtocolBufferNanoException.malformedVarint();
-  }
-
-  /** Read a 32-bit little-endian integer from the stream. */
-  public int readRawLittleEndian32() throws IOException {
-    final byte b1 = readRawByte();
-    final byte b2 = readRawByte();
-    final byte b3 = readRawByte();
-    final byte b4 = readRawByte();
-    return ((b1 & 0xff)      ) |
-           ((b2 & 0xff) <<  8) |
-           ((b3 & 0xff) << 16) |
-           ((b4 & 0xff) << 24);
-  }
-
-  /** Read a 64-bit little-endian integer from the stream. */
-  public long readRawLittleEndian64() throws IOException {
-    final byte b1 = readRawByte();
-    final byte b2 = readRawByte();
-    final byte b3 = readRawByte();
-    final byte b4 = readRawByte();
-    final byte b5 = readRawByte();
-    final byte b6 = readRawByte();
-    final byte b7 = readRawByte();
-    final byte b8 = readRawByte();
-    return (((long)b1 & 0xff)      ) |
-           (((long)b2 & 0xff) <<  8) |
-           (((long)b3 & 0xff) << 16) |
-           (((long)b4 & 0xff) << 24) |
-           (((long)b5 & 0xff) << 32) |
-           (((long)b6 & 0xff) << 40) |
-           (((long)b7 & 0xff) << 48) |
-           (((long)b8 & 0xff) << 56);
-  }
-
-  /**
-   * Decode a ZigZag-encoded 32-bit value.  ZigZag encodes signed integers
-   * into values that can be efficiently encoded with varint.  (Otherwise,
-   * negative values must be sign-extended to 64 bits to be varint encoded,
-   * thus always taking 10 bytes on the wire.)
-   *
-   * @param n An unsigned 32-bit integer, stored in a signed int because
-   *          Java has no explicit unsigned support.
-   * @return A signed 32-bit integer.
-   */
-  public static int decodeZigZag32(final int n) {
-    return (n >>> 1) ^ -(n & 1);
-  }
-
-  /**
-   * Decode a ZigZag-encoded 64-bit value.  ZigZag encodes signed integers
-   * into values that can be efficiently encoded with varint.  (Otherwise,
-   * negative values must be sign-extended to 64 bits to be varint encoded,
-   * thus always taking 10 bytes on the wire.)
-   *
-   * @param n An unsigned 64-bit integer, stored in a signed int because
-   *          Java has no explicit unsigned support.
-   * @return A signed 64-bit integer.
-   */
-  public static long decodeZigZag64(final long n) {
-    return (n >>> 1) ^ -(n & 1);
-  }
-
-  // -----------------------------------------------------------------
-
-  private final byte[] buffer;
-  private int bufferStart;
-  private int bufferSize;
-  private int bufferSizeAfterLimit;
-  private int bufferPos;
-  private int lastTag;
-
-  /** The absolute position of the end of the current message. */
-  private int currentLimit = Integer.MAX_VALUE;
-
-  /** See setRecursionLimit() */
-  private int recursionDepth;
-  private int recursionLimit = DEFAULT_RECURSION_LIMIT;
-
-  /** See setSizeLimit() */
-  private int sizeLimit = DEFAULT_SIZE_LIMIT;
-
-  private static final int DEFAULT_RECURSION_LIMIT = 64;
-  private static final int DEFAULT_SIZE_LIMIT = 64 << 20;  // 64MB
-
-  private CodedInputByteBufferNano(final byte[] buffer, final int off, final int len) {
-    this.buffer = buffer;
-    bufferStart = off;
-    bufferSize = off + len;
-    bufferPos = off;
-  }
-
-  /**
-   * Set the maximum message recursion depth.  In order to prevent malicious
-   * messages from causing stack overflows, {@code CodedInputStream} limits
-   * how deeply messages may be nested.  The default limit is 64.
-   *
-   * @return the old limit.
-   */
-  public int setRecursionLimit(final int limit) {
-    if (limit < 0) {
-      throw new IllegalArgumentException(
-        "Recursion limit cannot be negative: " + limit);
-    }
-    final int oldLimit = recursionLimit;
-    recursionLimit = limit;
-    return oldLimit;
-  }
-
-  /**
-   * Set the maximum message size.  In order to prevent malicious
-   * messages from exhausting memory or causing integer overflows,
-   * {@code CodedInputStream} limits how large a message may be.
-   * The default limit is 64MB.  You should set this limit as small
-   * as you can without harming your app's functionality.  Note that
-   * size limits only apply when reading from an {@code InputStream}, not
-   * when constructed around a raw byte array.
-   * <p>
-   * If you want to read several messages from a single CodedInputStream, you
-   * could call {@link #resetSizeCounter()} after each one to avoid hitting the
-   * size limit.
-   *
-   * @return the old limit.
-   */
-  public int setSizeLimit(final int limit) {
-    if (limit < 0) {
-      throw new IllegalArgumentException(
-        "Size limit cannot be negative: " + limit);
-    }
-    final int oldLimit = sizeLimit;
-    sizeLimit = limit;
-    return oldLimit;
-  }
-
-  /**
-   * Resets the current size counter to zero (see {@link #setSizeLimit(int)}).
-   */
-  public void resetSizeCounter() {
-  }
-
-  /**
-   * Sets {@code currentLimit} to (current position) + {@code byteLimit}.  This
-   * is called when descending into a length-delimited embedded message.
-   *
-   * @return the old limit.
-   */
-  public int pushLimit(int byteLimit) throws InvalidProtocolBufferNanoException {
-    if (byteLimit < 0) {
-      throw InvalidProtocolBufferNanoException.negativeSize();
-    }
-    byteLimit += bufferPos;
-    final int oldLimit = currentLimit;
-    if (byteLimit > oldLimit) {
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-    currentLimit = byteLimit;
-
-    recomputeBufferSizeAfterLimit();
-
-    return oldLimit;
-  }
-
-  private void recomputeBufferSizeAfterLimit() {
-    bufferSize += bufferSizeAfterLimit;
-    final int bufferEnd = bufferSize;
-    if (bufferEnd > currentLimit) {
-      // Limit is in current buffer.
-      bufferSizeAfterLimit = bufferEnd - currentLimit;
-      bufferSize -= bufferSizeAfterLimit;
-    } else {
-      bufferSizeAfterLimit = 0;
-    }
-  }
-
-  /**
-   * Discards the current limit, returning to the previous limit.
-   *
-   * @param oldLimit The old limit, as returned by {@code pushLimit}.
-   */
-  public void popLimit(final int oldLimit) {
-    currentLimit = oldLimit;
-    recomputeBufferSizeAfterLimit();
-  }
-
-  /**
-   * Returns the number of bytes to be read before the current limit.
-   * If no limit is set, returns -1.
-   */
-  public int getBytesUntilLimit() {
-    if (currentLimit == Integer.MAX_VALUE) {
-      return -1;
-    }
-
-    final int currentAbsolutePosition = bufferPos;
-    return currentLimit - currentAbsolutePosition;
-  }
-
-  /**
-   * Returns true if the stream has reached the end of the input.  This is the
-   * case if either the end of the underlying input source has been reached or
-   * if the stream has reached a limit created using {@link #pushLimit(int)}.
-   */
-  public boolean isAtEnd() {
-    return bufferPos == bufferSize;
-  }
-
-  /**
-   * Get current position in buffer relative to beginning offset.
-   */
-  public int getPosition() {
-    return bufferPos - bufferStart;
-  }
-
-  /**
-   * Retrieves a subset of data in the buffer. The returned array is not backed by the original
-   * buffer array.
-   *
-   * @param offset the position (relative to the buffer start position) to start at.
-   * @param length the number of bytes to retrieve.
-   */
-  public byte[] getData(int offset, int length) {
-    if (length == 0) {
-      return WireFormatNano.EMPTY_BYTES;
-    }
-    byte[] copy = new byte[length];
-    int start = bufferStart + offset;
-    System.arraycopy(buffer, start, copy, 0, length);
-    return copy;
-  }
-
-  /**
-   * Rewind to previous position. Cannot go forward.
-   */
-  public void rewindToPosition(int position) {
-    if (position > bufferPos - bufferStart) {
-      throw new IllegalArgumentException(
-              "Position " + position + " is beyond current " + (bufferPos - bufferStart));
-    }
-    if (position < 0) {
-      throw new IllegalArgumentException("Bad position " + position);
-    }
-    bufferPos = bufferStart + position;
-  }
-
-  /**
-   * Read one byte from the input.
-   *
-   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
-   *                                        limit was reached.
-   */
-  public byte readRawByte() throws IOException {
-    if (bufferPos == bufferSize) {
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-    return buffer[bufferPos++];
-  }
-
-  /**
-   * Read a fixed size of bytes from the input.
-   *
-   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
-   *                                        limit was reached.
-   */
-  public byte[] readRawBytes(final int size) throws IOException {
-    if (size < 0) {
-      throw InvalidProtocolBufferNanoException.negativeSize();
-    }
-
-    if (bufferPos + size > currentLimit) {
-      // Read to the end of the stream anyway.
-      skipRawBytes(currentLimit - bufferPos);
-      // Then fail.
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-
-    if (size <= bufferSize - bufferPos) {
-      // We have all the bytes we need already.
-      final byte[] bytes = new byte[size];
-      System.arraycopy(buffer, bufferPos, bytes, 0, size);
-      bufferPos += size;
-      return bytes;
-    } else {
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-  }
-
-  /**
-   * Reads and discards {@code size} bytes.
-   *
-   * @throws InvalidProtocolBufferNanoException The end of the stream or the current
-   *                                        limit was reached.
-   */
-  public void skipRawBytes(final int size) throws IOException {
-    if (size < 0) {
-      throw InvalidProtocolBufferNanoException.negativeSize();
-    }
-
-    if (bufferPos + size > currentLimit) {
-      // Read to the end of the stream anyway.
-      skipRawBytes(currentLimit - bufferPos);
-      // Then fail.
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-
-    if (size <= bufferSize - bufferPos) {
-      // We have all the bytes we need already.
-      bufferPos += size;
-    } else {
-      throw InvalidProtocolBufferNanoException.truncatedMessage();
-    }
-  }
-
-  // Read a primitive type.
-  Object readPrimitiveField(int type) throws IOException {
-    switch (type) {
-      case InternalNano.TYPE_DOUBLE:
-          return readDouble();
-      case InternalNano.TYPE_FLOAT:
-          return readFloat();
-      case InternalNano.TYPE_INT64:
-          return readInt64();
-      case InternalNano.TYPE_UINT64:
-          return readUInt64();
-      case InternalNano.TYPE_INT32:
-          return readInt32();
-      case InternalNano.TYPE_FIXED64:
-          return readFixed64();
-      case InternalNano.TYPE_FIXED32:
-          return readFixed32();
-      case InternalNano.TYPE_BOOL:
-          return readBool();
-      case InternalNano.TYPE_STRING:
-          return readString();
-      case InternalNano.TYPE_BYTES:
-          return readBytes();
-      case InternalNano.TYPE_UINT32:
-          return readUInt32();
-      case InternalNano.TYPE_ENUM:
-          return readEnum();
-      case InternalNano.TYPE_SFIXED32:
-          return readSFixed32();
-      case InternalNano.TYPE_SFIXED64:
-          return readSFixed64();
-      case InternalNano.TYPE_SINT32:
-          return readSInt32();
-      case InternalNano.TYPE_SINT64:
-          return readSInt64();
-      default:
-          throw new IllegalArgumentException("Unknown type " + type);
-    }
-  }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java b/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java
deleted file mode 100644
index 322ada8e..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/CodedOutputByteBufferNano.java
+++ /dev/null
@@ -1,1214 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-import java.nio.BufferOverflowException;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.ReadOnlyBufferException;
-
-/**
- * Encodes and writes protocol message fields.
- *
- * <p>This class contains two kinds of methods:  methods that write specific
- * protocol message constructs and field types (e.g. {@link #writeTag} and
- * {@link #writeInt32}) and methods that write low-level values (e.g.
- * {@link #writeRawVarint32} and {@link #writeRawBytes}).  If you are
- * writing encoded protocol messages, you should use the former methods, but if
- * you are writing some other format of your own design, use the latter.
- *
- * <p>This class is totally unsynchronized.
- *
- * @author kneton@google.com Kenton Varda
- */
-public final class CodedOutputByteBufferNano {
-  /* max bytes per java UTF-16 char in UTF-8 */
-  private static final int MAX_UTF8_EXPANSION = 3;
-  private final ByteBuffer buffer;
-
-  private CodedOutputByteBufferNano(final byte[] buffer, final int offset,
-                            final int length) {
-    this(ByteBuffer.wrap(buffer, offset, length));
-  }
-
-  private CodedOutputByteBufferNano(final ByteBuffer buffer) {
-    this.buffer = buffer;
-    this.buffer.order(ByteOrder.LITTLE_ENDIAN);
-  }
-
-  /**
-   * Create a new {@code CodedOutputStream} that writes directly to the given
-   * byte array.  If more bytes are written than fit in the array,
-   * {@link OutOfSpaceException} will be thrown.  Writing directly to a flat
-   * array is faster than writing to an {@code OutputStream}.
-   */
-  public static CodedOutputByteBufferNano newInstance(final byte[] flatArray) {
-    return newInstance(flatArray, 0, flatArray.length);
-  }
-
-  /**
-   * Create a new {@code CodedOutputStream} that writes directly to the given
-   * byte array slice.  If more bytes are written than fit in the slice,
-   * {@link OutOfSpaceException} will be thrown.  Writing directly to a flat
-   * array is faster than writing to an {@code OutputStream}.
-   */
-  public static CodedOutputByteBufferNano newInstance(final byte[] flatArray,
-                                              final int offset,
-                                              final int length) {
-    return new CodedOutputByteBufferNano(flatArray, offset, length);
-  }
-
-  // -----------------------------------------------------------------
-
-  /** Write a {@code double} field, including tag, to the stream. */
-  public void writeDouble(final int fieldNumber, final double value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
-    writeDoubleNoTag(value);
-  }
-
-  /** Write a {@code float} field, including tag, to the stream. */
-  public void writeFloat(final int fieldNumber, final float value)
-                         throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
-    writeFloatNoTag(value);
-  }
-
-  /** Write a {@code uint64} field, including tag, to the stream. */
-  public void writeUInt64(final int fieldNumber, final long value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeUInt64NoTag(value);
-  }
-
-  /** Write an {@code int64} field, including tag, to the stream. */
-  public void writeInt64(final int fieldNumber, final long value)
-                         throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeInt64NoTag(value);
-  }
-
-  /** Write an {@code int32} field, including tag, to the stream. */
-  public void writeInt32(final int fieldNumber, final int value)
-                         throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeInt32NoTag(value);
-  }
-
-  /** Write a {@code fixed64} field, including tag, to the stream. */
-  public void writeFixed64(final int fieldNumber, final long value)
-                           throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
-    writeFixed64NoTag(value);
-  }
-
-  /** Write a {@code fixed32} field, including tag, to the stream. */
-  public void writeFixed32(final int fieldNumber, final int value)
-                           throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
-    writeFixed32NoTag(value);
-  }
-
-  /** Write a {@code bool} field, including tag, to the stream. */
-  public void writeBool(final int fieldNumber, final boolean value)
-                        throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeBoolNoTag(value);
-  }
-
-  /** Write a {@code string} field, including tag, to the stream. */
-  public void writeString(final int fieldNumber, final String value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-    writeStringNoTag(value);
-  }
-
-  /** Write a {@code group} field, including tag, to the stream. */
-  public void writeGroup(final int fieldNumber, final MessageNano value)
-                         throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_START_GROUP);
-    writeGroupNoTag(value);
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP);
-  }
-
-  /** Write an embedded message field, including tag, to the stream. */
-  public void writeMessage(final int fieldNumber, final MessageNano value)
-                           throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-    writeMessageNoTag(value);
-  }
-
-  /** Write a {@code bytes} field, including tag, to the stream. */
-  public void writeBytes(final int fieldNumber, final byte[] value)
-                         throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-    writeBytesNoTag(value);
-  }
-
-  /** Write a {@code uint32} field, including tag, to the stream. */
-  public void writeUInt32(final int fieldNumber, final int value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeUInt32NoTag(value);
-  }
-
-  /**
-   * Write an enum field, including tag, to the stream.  Caller is responsible
-   * for converting the enum value to its numeric value.
-   */
-  public void writeEnum(final int fieldNumber, final int value)
-                        throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeEnumNoTag(value);
-  }
-
-  /** Write an {@code sfixed32} field, including tag, to the stream. */
-  public void writeSFixed32(final int fieldNumber, final int value)
-                            throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED32);
-    writeSFixed32NoTag(value);
-  }
-
-  /** Write an {@code sfixed64} field, including tag, to the stream. */
-  public void writeSFixed64(final int fieldNumber, final long value)
-                            throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_FIXED64);
-    writeSFixed64NoTag(value);
-  }
-
-  /** Write an {@code sint32} field, including tag, to the stream. */
-  public void writeSInt32(final int fieldNumber, final int value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeSInt32NoTag(value);
-  }
-
-  /** Write an {@code sint64} field, including tag, to the stream. */
-  public void writeSInt64(final int fieldNumber, final long value)
-                          throws IOException {
-    writeTag(fieldNumber, WireFormatNano.WIRETYPE_VARINT);
-    writeSInt64NoTag(value);
-  }
-
-  /**
-   * Write a MessageSet extension field to the stream.  For historical reasons,
-   * the wire format differs from normal fields.
-   */
-//  public void writeMessageSetExtension(final int fieldNumber,
-//                                       final MessageMicro value)
-//                                       throws IOException {
-//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_START_GROUP);
-//    writeUInt32(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber);
-//    writeMessage(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
-//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_END_GROUP);
-//  }
-
-  /**
-   * Write an unparsed MessageSet extension field to the stream.  For
-   * historical reasons, the wire format differs from normal fields.
-   */
-//  public void writeRawMessageSetExtension(final int fieldNumber,
-//                                          final ByteStringMicro value)
-//                                          throws IOException {
-//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_START_GROUP);
-//    writeUInt32(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber);
-//    writeBytes(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
-//    writeTag(WireFormatMicro.MESSAGE_SET_ITEM, WireFormatMicro.WIRETYPE_END_GROUP);
-//  }
-
-  // -----------------------------------------------------------------
-
-  /** Write a {@code double} field to the stream. */
-  public void writeDoubleNoTag(final double value) throws IOException {
-    writeRawLittleEndian64(Double.doubleToLongBits(value));
-  }
-
-  /** Write a {@code float} field to the stream. */
-  public void writeFloatNoTag(final float value) throws IOException {
-    writeRawLittleEndian32(Float.floatToIntBits(value));
-  }
-
-  /** Write a {@code uint64} field to the stream. */
-  public void writeUInt64NoTag(final long value) throws IOException {
-    writeRawVarint64(value);
-  }
-
-  /** Write an {@code int64} field to the stream. */
-  public void writeInt64NoTag(final long value) throws IOException {
-    writeRawVarint64(value);
-  }
-
-  /** Write an {@code int32} field to the stream. */
-  public void writeInt32NoTag(final int value) throws IOException {
-    if (value >= 0) {
-      writeRawVarint32(value);
-    } else {
-      // Must sign-extend.
-      writeRawVarint64(value);
-    }
-  }
-
-  /** Write a {@code fixed64} field to the stream. */
-  public void writeFixed64NoTag(final long value) throws IOException {
-    writeRawLittleEndian64(value);
-  }
-
-  /** Write a {@code fixed32} field to the stream. */
-  public void writeFixed32NoTag(final int value) throws IOException {
-    writeRawLittleEndian32(value);
-  }
-
-  /** Write a {@code bool} field to the stream. */
-  public void writeBoolNoTag(final boolean value) throws IOException {
-    writeRawByte(value ? 1 : 0);
-  }
-
-  /** Write a {@code string} field to the stream. */
-  public void writeStringNoTag(final String value) throws IOException {
-    // UTF-8 byte length of the string is at least its UTF-16 code unit length (value.length()),
-    // and at most 3 times of it. Optimize for the case where we know this length results in a
-    // constant varint length - saves measuring length of the string.
-    try {
-      final int minLengthVarIntSize = computeRawVarint32Size(value.length());
-      final int maxLengthVarIntSize = computeRawVarint32Size(value.length() * MAX_UTF8_EXPANSION);
-      if (minLengthVarIntSize == maxLengthVarIntSize) {
-        int oldPosition = buffer.position();
-        // Buffer.position, when passed a position that is past its limit, throws
-        // IllegalArgumentException, and this class is documented to throw
-        // OutOfSpaceException instead.
-        if (buffer.remaining() < minLengthVarIntSize) {
-          throw new OutOfSpaceException(oldPosition + minLengthVarIntSize, buffer.limit());
-        }
-        buffer.position(oldPosition + minLengthVarIntSize);
-        encode(value, buffer);
-        int newPosition = buffer.position();
-        buffer.position(oldPosition);
-        writeRawVarint32(newPosition - oldPosition - minLengthVarIntSize);
-        buffer.position(newPosition);
-      } else {
-        writeRawVarint32(encodedLength(value));
-        encode(value, buffer);
-      }
-    } catch (BufferOverflowException e) {
-      final OutOfSpaceException outOfSpaceException = new OutOfSpaceException(buffer.position(),
-          buffer.limit());
-      outOfSpaceException.initCause(e);
-      throw outOfSpaceException;
-    }
-  }
-
-  // These UTF-8 handling methods are copied from Guava's Utf8 class.
-  /**
-   * Returns the number of bytes in the UTF-8-encoded form of {@code sequence}. For a string,
-   * this method is equivalent to {@code string.getBytes(UTF_8).length}, but is more efficient in
-   * both time and space.
-   *
-   * @throws IllegalArgumentException if {@code sequence} contains ill-formed UTF-16 (unpaired
-   *     surrogates)
-   */
-  private static int encodedLength(CharSequence sequence) {
-    // Warning to maintainers: this implementation is highly optimized.
-    int utf16Length = sequence.length();
-    int utf8Length = utf16Length;
-    int i = 0;
-
-    // This loop optimizes for pure ASCII.
-    while (i < utf16Length && sequence.charAt(i) < 0x80) {
-      i++;
-    }
-
-    // This loop optimizes for chars less than 0x800.
-    for (; i < utf16Length; i++) {
-      char c = sequence.charAt(i);
-      if (c < 0x800) {
-        utf8Length += ((0x7f - c) >>> 31);  // branch free!
-      } else {
-        utf8Length += encodedLengthGeneral(sequence, i);
-        break;
-      }
-    }
-
-    if (utf8Length < utf16Length) {
-      // Necessary and sufficient condition for overflow because of maximum 3x expansion
-      throw new IllegalArgumentException("UTF-8 length does not fit in int: "
-              + (utf8Length + (1L << 32)));
-    }
-    return utf8Length;
-  }
-
-  private static int encodedLengthGeneral(CharSequence sequence, int start) {
-    int utf16Length = sequence.length();
-    int utf8Length = 0;
-    for (int i = start; i < utf16Length; i++) {
-      char c = sequence.charAt(i);
-      if (c < 0x800) {
-        utf8Length += (0x7f - c) >>> 31; // branch free!
-      } else {
-        utf8Length += 2;
-        // jdk7+: if (Character.isSurrogate(c)) {
-        if (Character.MIN_SURROGATE <= c && c <= Character.MAX_SURROGATE) {
-          // Check that we have a well-formed surrogate pair.
-          int cp = Character.codePointAt(sequence, i);
-          if (cp < Character.MIN_SUPPLEMENTARY_CODE_POINT) {
-            throw new IllegalArgumentException("Unpaired surrogate at index " + i);
-          }
-          i++;
-        }
-      }
-    }
-    return utf8Length;
-  }
-
-  /**
-   * Encodes {@code sequence} into UTF-8, in {@code byteBuffer}. For a string, this method is
-   * equivalent to {@code buffer.put(string.getBytes(UTF_8))}, but is more efficient in both time
-   * and space. Bytes are written starting at the current position. This method requires paired
-   * surrogates, and therefore does not support chunking.
-   *
-   * <p>To ensure sufficient space in the output buffer, either call {@link #encodedLength} to
-   * compute the exact amount needed, or leave room for {@code 3 * sequence.length()}, which is the
-   * largest possible number of bytes that any input can be encoded to.
-   *
-   * @throws IllegalArgumentException if {@code sequence} contains ill-formed UTF-16 (unpaired
-   *     surrogates)
-   * @throws BufferOverflowException if {@code sequence} encoded in UTF-8 does not fit in
-   *     {@code byteBuffer}'s remaining space.
-   * @throws ReadOnlyBufferException if {@code byteBuffer} is a read-only buffer.
-   */
-  private static void encode(CharSequence sequence, ByteBuffer byteBuffer) {
-    if (byteBuffer.isReadOnly()) {
-      throw new ReadOnlyBufferException();
-    } else if (byteBuffer.hasArray()) {
-      try {
-        int encoded = encode(sequence,
-                byteBuffer.array(),
-                byteBuffer.arrayOffset() + byteBuffer.position(),
-                byteBuffer.remaining());
-        byteBuffer.position(encoded - byteBuffer.arrayOffset());
-      } catch (ArrayIndexOutOfBoundsException e) {
-        BufferOverflowException boe = new BufferOverflowException();
-        boe.initCause(e);
-        throw boe;
-      }
-    } else {
-      encodeDirect(sequence, byteBuffer);
-    }
-  }
-
-  private static void encodeDirect(CharSequence sequence, ByteBuffer byteBuffer) {
-    int utf16Length = sequence.length();
-    for (int i = 0; i < utf16Length; i++) {
-      final char c = sequence.charAt(i);
-      if (c < 0x80) { // ASCII
-        byteBuffer.put((byte) c);
-      } else if (c < 0x800) { // 11 bits, two UTF-8 bytes
-        byteBuffer.put((byte) ((0xF << 6) | (c >>> 6)));
-        byteBuffer.put((byte) (0x80 | (0x3F & c)));
-      } else if (c < Character.MIN_SURROGATE || Character.MAX_SURROGATE < c) {
-        // Maximium single-char code point is 0xFFFF, 16 bits, three UTF-8 bytes
-        byteBuffer.put((byte) ((0xF << 5) | (c >>> 12)));
-        byteBuffer.put((byte) (0x80 | (0x3F & (c >>> 6))));
-        byteBuffer.put((byte) (0x80 | (0x3F & c)));
-      } else {
-        final char low;
-        if (i + 1 == sequence.length()
-                || !Character.isSurrogatePair(c, (low = sequence.charAt(++i)))) {
-          throw new IllegalArgumentException("Unpaired surrogate at index " + (i - 1));
-        }
-        int codePoint = Character.toCodePoint(c, low);
-        byteBuffer.put((byte) ((0xF << 4) | (codePoint >>> 18)));
-        byteBuffer.put((byte) (0x80 | (0x3F & (codePoint >>> 12))));
-        byteBuffer.put((byte) (0x80 | (0x3F & (codePoint >>> 6))));
-        byteBuffer.put((byte) (0x80 | (0x3F & codePoint)));
-      }
-    }
-  }
-
-  private static int encode(CharSequence sequence, byte[] bytes, int offset, int length) {
-    int utf16Length = sequence.length();
-    int j = offset;
-    int i = 0;
-    int limit = offset + length;
-    // Designed to take advantage of
-    // https://wikis.oracle.com/display/HotSpotInternals/RangeCheckElimination
-    for (char c; i < utf16Length && i + j < limit && (c = sequence.charAt(i)) < 0x80; i++) {
-      bytes[j + i] = (byte) c;
-    }
-    if (i == utf16Length) {
-      return j + utf16Length;
-    }
-    j += i;
-    for (char c; i < utf16Length; i++) {
-      c = sequence.charAt(i);
-      if (c < 0x80 && j < limit) {
-        bytes[j++] = (byte) c;
-      } else if (c < 0x800 && j <= limit - 2) { // 11 bits, two UTF-8 bytes
-        bytes[j++] = (byte) ((0xF << 6) | (c >>> 6));
-        bytes[j++] = (byte) (0x80 | (0x3F & c));
-      } else if ((c < Character.MIN_SURROGATE || Character.MAX_SURROGATE < c) && j <= limit - 3) {
-        // Maximum single-char code point is 0xFFFF, 16 bits, three UTF-8 bytes
-        bytes[j++] = (byte) ((0xF << 5) | (c >>> 12));
-        bytes[j++] = (byte) (0x80 | (0x3F & (c >>> 6)));
-        bytes[j++] = (byte) (0x80 | (0x3F & c));
-      } else if (j <= limit - 4) {
-        // Minimum code point represented by a surrogate pair is 0x10000, 17 bits, four UTF-8 bytes
-        final char low;
-        if (i + 1 == sequence.length()
-                || !Character.isSurrogatePair(c, (low = sequence.charAt(++i)))) {
-          throw new IllegalArgumentException("Unpaired surrogate at index " + (i - 1));
-        }
-        int codePoint = Character.toCodePoint(c, low);
-        bytes[j++] = (byte) ((0xF << 4) | (codePoint >>> 18));
-        bytes[j++] = (byte) (0x80 | (0x3F & (codePoint >>> 12)));
-        bytes[j++] = (byte) (0x80 | (0x3F & (codePoint >>> 6)));
-        bytes[j++] = (byte) (0x80 | (0x3F & codePoint));
-      } else {
-        throw new ArrayIndexOutOfBoundsException("Failed writing " + c + " at index " + j);
-      }
-    }
-    return j;
-  }
-
-  // End guava UTF-8 methods
-
-
-  /** Write a {@code group} field to the stream. */
-  public void writeGroupNoTag(final MessageNano value) throws IOException {
-    value.writeTo(this);
-  }
-
-  /** Write an embedded message field to the stream. */
-  public void writeMessageNoTag(final MessageNano value) throws IOException {
-    writeRawVarint32(value.getCachedSize());
-    value.writeTo(this);
-  }
-
-  /** Write a {@code bytes} field to the stream. */
-  public void writeBytesNoTag(final byte[] value) throws IOException {
-    writeRawVarint32(value.length);
-    writeRawBytes(value);
-  }
-
-  /** Write a {@code uint32} field to the stream. */
-  public void writeUInt32NoTag(final int value) throws IOException {
-    writeRawVarint32(value);
-  }
-
-  /**
-   * Write an enum field to the stream.  Caller is responsible
-   * for converting the enum value to its numeric value.
-   */
-  public void writeEnumNoTag(final int value) throws IOException {
-    writeRawVarint32(value);
-  }
-
-  /** Write an {@code sfixed32} field to the stream. */
-  public void writeSFixed32NoTag(final int value) throws IOException {
-    writeRawLittleEndian32(value);
-  }
-
-  /** Write an {@code sfixed64} field to the stream. */
-  public void writeSFixed64NoTag(final long value) throws IOException {
-    writeRawLittleEndian64(value);
-  }
-
-  /** Write an {@code sint32} field to the stream. */
-  public void writeSInt32NoTag(final int value) throws IOException {
-    writeRawVarint32(encodeZigZag32(value));
-  }
-
-  /** Write an {@code sint64} field to the stream. */
-  public void writeSInt64NoTag(final long value) throws IOException {
-    writeRawVarint64(encodeZigZag64(value));
-  }
-
-  // =================================================================
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code double} field, including tag.
-   */
-  public static int computeDoubleSize(final int fieldNumber,
-                                      final double value) {
-    return computeTagSize(fieldNumber) + computeDoubleSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code float} field, including tag.
-   */
-  public static int computeFloatSize(final int fieldNumber, final float value) {
-    return computeTagSize(fieldNumber) + computeFloatSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code uint64} field, including tag.
-   */
-  public static int computeUInt64Size(final int fieldNumber, final long value) {
-    return computeTagSize(fieldNumber) + computeUInt64SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code int64} field, including tag.
-   */
-  public static int computeInt64Size(final int fieldNumber, final long value) {
-    return computeTagSize(fieldNumber) + computeInt64SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code int32} field, including tag.
-   */
-  public static int computeInt32Size(final int fieldNumber, final int value) {
-    return computeTagSize(fieldNumber) + computeInt32SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code fixed64} field, including tag.
-   */
-  public static int computeFixed64Size(final int fieldNumber,
-                                       final long value) {
-    return computeTagSize(fieldNumber) + computeFixed64SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code fixed32} field, including tag.
-   */
-  public static int computeFixed32Size(final int fieldNumber,
-                                       final int value) {
-    return computeTagSize(fieldNumber) + computeFixed32SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code bool} field, including tag.
-   */
-  public static int computeBoolSize(final int fieldNumber,
-                                    final boolean value) {
-    return computeTagSize(fieldNumber) + computeBoolSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code string} field, including tag.
-   */
-  public static int computeStringSize(final int fieldNumber,
-                                      final String value) {
-    return computeTagSize(fieldNumber) + computeStringSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code group} field, including tag.
-   */
-  public static int computeGroupSize(final int fieldNumber,
-                                     final MessageNano value) {
-    return computeTagSize(fieldNumber) * 2 + computeGroupSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * embedded message field, including tag.
-   */
-  public static int computeMessageSize(final int fieldNumber,
-                                       final MessageNano value) {
-    return computeTagSize(fieldNumber) + computeMessageSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code bytes} field, including tag.
-   */
-  public static int computeBytesSize(final int fieldNumber,
-                                     final byte[] value) {
-    return computeTagSize(fieldNumber) + computeBytesSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code uint32} field, including tag.
-   */
-  public static int computeUInt32Size(final int fieldNumber, final int value) {
-    return computeTagSize(fieldNumber) + computeUInt32SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * enum field, including tag.  Caller is responsible for converting the
-   * enum value to its numeric value.
-   */
-  public static int computeEnumSize(final int fieldNumber, final int value) {
-    return computeTagSize(fieldNumber) + computeEnumSizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sfixed32} field, including tag.
-   */
-  public static int computeSFixed32Size(final int fieldNumber,
-                                        final int value) {
-    return computeTagSize(fieldNumber) + computeSFixed32SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sfixed64} field, including tag.
-   */
-  public static int computeSFixed64Size(final int fieldNumber,
-                                        final long value) {
-    return computeTagSize(fieldNumber) + computeSFixed64SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sint32} field, including tag.
-   */
-  public static int computeSInt32Size(final int fieldNumber, final int value) {
-    return computeTagSize(fieldNumber) + computeSInt32SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sint64} field, including tag.
-   */
-  public static int computeSInt64Size(final int fieldNumber, final long value) {
-    return computeTagSize(fieldNumber) + computeSInt64SizeNoTag(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * MessageSet extension to the stream.  For historical reasons,
-   * the wire format differs from normal fields.
-   */
-//  public static int computeMessageSetExtensionSize(
-//      final int fieldNumber, final MessageMicro value) {
-//    return computeTagSize(WireFormatMicro.MESSAGE_SET_ITEM) * 2 +
-//           computeUInt32Size(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber) +
-//           computeMessageSize(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
-//  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * unparsed MessageSet extension field to the stream.  For
-   * historical reasons, the wire format differs from normal fields.
-   */
-//  public static int computeRawMessageSetExtensionSize(
-//      final int fieldNumber, final ByteStringMicro value) {
-//    return computeTagSize(WireFormatMicro.MESSAGE_SET_ITEM) * 2 +
-//           computeUInt32Size(WireFormatMicro.MESSAGE_SET_TYPE_ID, fieldNumber) +
-//           computeBytesSize(WireFormatMicro.MESSAGE_SET_MESSAGE, value);
-//  }
-
-  // -----------------------------------------------------------------
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code double} field, including tag.
-   */
-  public static int computeDoubleSizeNoTag(final double value) {
-    return LITTLE_ENDIAN_64_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code float} field, including tag.
-   */
-  public static int computeFloatSizeNoTag(final float value) {
-    return LITTLE_ENDIAN_32_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code uint64} field, including tag.
-   */
-  public static int computeUInt64SizeNoTag(final long value) {
-    return computeRawVarint64Size(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code int64} field, including tag.
-   */
-  public static int computeInt64SizeNoTag(final long value) {
-    return computeRawVarint64Size(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code int32} field, including tag.
-   */
-  public static int computeInt32SizeNoTag(final int value) {
-    if (value >= 0) {
-      return computeRawVarint32Size(value);
-    } else {
-      // Must sign-extend.
-      return 10;
-    }
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code fixed64} field.
-   */
-  public static int computeFixed64SizeNoTag(final long value) {
-    return LITTLE_ENDIAN_64_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code fixed32} field.
-   */
-  public static int computeFixed32SizeNoTag(final int value) {
-    return LITTLE_ENDIAN_32_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code bool} field.
-   */
-  public static int computeBoolSizeNoTag(final boolean value) {
-    return 1;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code string} field.
-   */
-  public static int computeStringSizeNoTag(final String value) {
-    final int length = encodedLength(value);
-    return computeRawVarint32Size(length) + length;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code group} field.
-   */
-  public static int computeGroupSizeNoTag(final MessageNano value) {
-    return value.getSerializedSize();
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an embedded
-   * message field.
-   */
-  public static int computeMessageSizeNoTag(final MessageNano value) {
-    final int size = value.getSerializedSize();
-    return computeRawVarint32Size(size) + size;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code bytes} field.
-   */
-  public static int computeBytesSizeNoTag(final byte[] value) {
-    return computeRawVarint32Size(value.length) + value.length;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a
-   * {@code uint32} field.
-   */
-  public static int computeUInt32SizeNoTag(final int value) {
-    return computeRawVarint32Size(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an enum field.
-   * Caller is responsible for converting the enum value to its numeric value.
-   */
-  public static int computeEnumSizeNoTag(final int value) {
-    return computeRawVarint32Size(value);
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sfixed32} field.
-   */
-  public static int computeSFixed32SizeNoTag(final int value) {
-    return LITTLE_ENDIAN_32_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sfixed64} field.
-   */
-  public static int computeSFixed64SizeNoTag(final long value) {
-    return LITTLE_ENDIAN_64_SIZE;
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sint32} field.
-   */
-  public static int computeSInt32SizeNoTag(final int value) {
-    return computeRawVarint32Size(encodeZigZag32(value));
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode an
-   * {@code sint64} field.
-   */
-  public static int computeSInt64SizeNoTag(final long value) {
-    return computeRawVarint64Size(encodeZigZag64(value));
-  }
-
-  // =================================================================
-
-  /**
-   * If writing to a flat array, return the space left in the array.
-   * Otherwise, throws {@code UnsupportedOperationException}.
-   */
-  public int spaceLeft() {
-    return buffer.remaining();
-  }
-
-  /**
-   * Verifies that {@link #spaceLeft()} returns zero.  It's common to create
-   * a byte array that is exactly big enough to hold a message, then write to
-   * it with a {@code CodedOutputStream}.  Calling {@code checkNoSpaceLeft()}
-   * after writing verifies that the message was actually as big as expected,
-   * which can help catch bugs.
-   */
-  public void checkNoSpaceLeft() {
-    if (spaceLeft() != 0) {
-      throw new IllegalStateException(
-        "Did not write as much data as expected.");
-    }
-  }
-
-  /**
-   * Returns the position within the internal buffer.
-   */
-  public int position() {
-    return buffer.position();
-  }
-
-  /**
-   * Resets the position within the internal buffer to zero.
-   *
-   * @see #position
-   * @see #spaceLeft
-   */
-  public void reset() {
-    buffer.clear();
-  }
-
-  /**
-   * If you create a CodedOutputStream around a simple flat array, you must
-   * not attempt to write more bytes than the array has space.  Otherwise,
-   * this exception will be thrown.
-   */
-  public static class OutOfSpaceException extends IOException {
-    private static final long serialVersionUID = -6947486886997889499L;
-
-    OutOfSpaceException(int position, int limit) {
-      super("CodedOutputStream was writing to a flat byte array and ran " +
-            "out of space (pos " + position + " limit " + limit + ").");
-    }
-  }
-
-  /** Write a single byte. */
-  public void writeRawByte(final byte value) throws IOException {
-    if (!buffer.hasRemaining()) {
-      // We're writing to a single buffer.
-      throw new OutOfSpaceException(buffer.position(), buffer.limit());
-    }
-
-    buffer.put(value);
-  }
-
-  /** Write a single byte, represented by an integer value. */
-  public void writeRawByte(final int value) throws IOException {
-    writeRawByte((byte) value);
-  }
-
-  /** Write an array of bytes. */
-  public void writeRawBytes(final byte[] value) throws IOException {
-    writeRawBytes(value, 0, value.length);
-  }
-
-  /** Write part of an array of bytes. */
-  public void writeRawBytes(final byte[] value, int offset, int length)
-                            throws IOException {
-    if (buffer.remaining() >= length) {
-      buffer.put(value, offset, length);
-    } else {
-      // We're writing to a single buffer.
-      throw new OutOfSpaceException(buffer.position(), buffer.limit());
-    }
-  }
-
-  /** Encode and write a tag. */
-  public void writeTag(final int fieldNumber, final int wireType)
-                       throws IOException {
-    writeRawVarint32(WireFormatNano.makeTag(fieldNumber, wireType));
-  }
-
-  /** Compute the number of bytes that would be needed to encode a tag. */
-  public static int computeTagSize(final int fieldNumber) {
-    return computeRawVarint32Size(WireFormatNano.makeTag(fieldNumber, 0));
-  }
-
-  /**
-   * Encode and write a varint.  {@code value} is treated as
-   * unsigned, so it won't be sign-extended if negative.
-   */
-  public void writeRawVarint32(int value) throws IOException {
-    while (true) {
-      if ((value & ~0x7F) == 0) {
-        writeRawByte(value);
-        return;
-      } else {
-        writeRawByte((value & 0x7F) | 0x80);
-        value >>>= 7;
-      }
-    }
-  }
-
-  /**
-   * Compute the number of bytes that would be needed to encode a varint.
-   * {@code value} is treated as unsigned, so it won't be sign-extended if
-   * negative.
-   */
-  public static int computeRawVarint32Size(final int value) {
-    if ((value & (0xffffffff <<  7)) == 0) return 1;
-    if ((value & (0xffffffff << 14)) == 0) return 2;
-    if ((value & (0xffffffff << 21)) == 0) return 3;
-    if ((value & (0xffffffff << 28)) == 0) return 4;
-    return 5;
-  }
-
-  /** Encode and write a varint. */
-  public void writeRawVarint64(long value) throws IOException {
-    while (true) {
-      if ((value & ~0x7FL) == 0) {
-        writeRawByte((int)value);
-        return;
-      } else {
-        writeRawByte(((int)value & 0x7F) | 0x80);
-        value >>>= 7;
-      }
-    }
-  }
-
-  /** Compute the number of bytes that would be needed to encode a varint. */
-  public static int computeRawVarint64Size(final long value) {
-    if ((value & (0xffffffffffffffffL <<  7)) == 0) return 1;
-    if ((value & (0xffffffffffffffffL << 14)) == 0) return 2;
-    if ((value & (0xffffffffffffffffL << 21)) == 0) return 3;
-    if ((value & (0xffffffffffffffffL << 28)) == 0) return 4;
-    if ((value & (0xffffffffffffffffL << 35)) == 0) return 5;
-    if ((value & (0xffffffffffffffffL << 42)) == 0) return 6;
-    if ((value & (0xffffffffffffffffL << 49)) == 0) return 7;
-    if ((value & (0xffffffffffffffffL << 56)) == 0) return 8;
-    if ((value & (0xffffffffffffffffL << 63)) == 0) return 9;
-    return 10;
-  }
-
-  /** Write a little-endian 32-bit integer. */
-  public void writeRawLittleEndian32(final int value) throws IOException {
-    if (buffer.remaining() < 4) {
-      throw new OutOfSpaceException(buffer.position(), buffer.limit());
-    }
-    buffer.putInt(value);
-  }
-
-  public static final int LITTLE_ENDIAN_32_SIZE = 4;
-
-  /** Write a little-endian 64-bit integer. */
-  public void writeRawLittleEndian64(final long value) throws IOException {
-    if (buffer.remaining() < 8) {
-      throw new OutOfSpaceException(buffer.position(), buffer.limit());
-    }
-    buffer.putLong(value);
-  }
-
-  public static final int LITTLE_ENDIAN_64_SIZE = 8;
-
-  /**
-   * Encode a ZigZag-encoded 32-bit value.  ZigZag encodes signed integers
-   * into values that can be efficiently encoded with varint.  (Otherwise,
-   * negative values must be sign-extended to 64 bits to be varint encoded,
-   * thus always taking 10 bytes on the wire.)
-   *
-   * @param n A signed 32-bit integer.
-   * @return An unsigned 32-bit integer, stored in a signed int because
-   *         Java has no explicit unsigned support.
-   */
-  public static int encodeZigZag32(final int n) {
-    // Note:  the right-shift must be arithmetic
-    return (n << 1) ^ (n >> 31);
-  }
-
-  /**
-   * Encode a ZigZag-encoded 64-bit value.  ZigZag encodes signed integers
-   * into values that can be efficiently encoded with varint.  (Otherwise,
-   * negative values must be sign-extended to 64 bits to be varint encoded,
-   * thus always taking 10 bytes on the wire.)
-   *
-   * @param n A signed 64-bit integer.
-   * @return An unsigned 64-bit integer, stored in a signed int because
-   *         Java has no explicit unsigned support.
-   */
-  public static long encodeZigZag64(final long n) {
-    // Note:  the right-shift must be arithmetic
-    return (n << 1) ^ (n >> 63);
-  }
-
-  static int computeFieldSize(int number, int type, Object object) {
-    switch (type) {
-      case InternalNano.TYPE_BOOL:
-        return computeBoolSize(number, (Boolean) object);
-      case InternalNano.TYPE_BYTES:
-        return computeBytesSize(number, (byte[]) object);
-      case InternalNano.TYPE_STRING:
-        return computeStringSize(number, (String) object);
-      case InternalNano.TYPE_FLOAT:
-        return computeFloatSize(number, (Float) object);
-      case InternalNano.TYPE_DOUBLE:
-        return computeDoubleSize(number, (Double) object);
-      case InternalNano.TYPE_ENUM:
-        return computeEnumSize(number, (Integer) object);
-      case InternalNano.TYPE_FIXED32:
-        return computeFixed32Size(number, (Integer) object);
-      case InternalNano.TYPE_INT32:
-        return computeInt32Size(number, (Integer) object);
-      case InternalNano.TYPE_UINT32:
-        return computeUInt32Size(number, (Integer) object);
-      case InternalNano.TYPE_SINT32:
-        return computeSInt32Size(number, (Integer) object);
-      case InternalNano.TYPE_SFIXED32:
-        return computeSFixed32Size(number, (Integer) object);
-      case InternalNano.TYPE_INT64:
-        return computeInt64Size(number, (Long) object);
-      case InternalNano.TYPE_UINT64:
-        return computeUInt64Size(number, (Long) object);
-      case InternalNano.TYPE_SINT64:
-        return computeSInt64Size(number, (Long) object);
-      case InternalNano.TYPE_FIXED64:
-        return computeFixed64Size(number, (Long) object);
-      case InternalNano.TYPE_SFIXED64:
-        return computeSFixed64Size(number, (Long) object);
-      case InternalNano.TYPE_MESSAGE:
-        return computeMessageSize(number, (MessageNano) object);
-      case InternalNano.TYPE_GROUP:
-        return computeGroupSize(number, (MessageNano) object);
-      default:
-        throw new IllegalArgumentException("Unknown type: " + type);
-    }
-  }
-
-  void writeField(int number, int type, Object value)
-      throws IOException {
-    switch (type) {
-      case InternalNano.TYPE_DOUBLE:
-        Double doubleValue = (Double) value;
-        writeDouble(number, doubleValue);
-        break;
-      case InternalNano.TYPE_FLOAT:
-        Float floatValue = (Float) value;
-        writeFloat(number, floatValue);
-        break;
-      case InternalNano.TYPE_INT64:
-        Long int64Value = (Long) value;
-        writeInt64(number, int64Value);
-        break;
-      case InternalNano.TYPE_UINT64:
-        Long uint64Value = (Long) value;
-        writeUInt64(number, uint64Value);
-        break;
-      case InternalNano.TYPE_INT32:
-        Integer int32Value = (Integer) value;
-        writeInt32(number, int32Value);
-        break;
-      case InternalNano.TYPE_FIXED64:
-        Long fixed64Value = (Long) value;
-        writeFixed64(number, fixed64Value);
-        break;
-      case InternalNano.TYPE_FIXED32:
-        Integer fixed32Value = (Integer) value;
-        writeFixed32(number, fixed32Value);
-        break;
-      case InternalNano.TYPE_BOOL:
-        Boolean boolValue = (Boolean) value;
-        writeBool(number, boolValue);
-        break;
-      case InternalNano.TYPE_STRING:
-        String stringValue = (String) value;
-        writeString(number, stringValue);
-        break;
-      case InternalNano.TYPE_BYTES:
-        byte[] bytesValue = (byte[]) value;
-        writeBytes(number, bytesValue);
-        break;
-      case InternalNano.TYPE_UINT32:
-        Integer uint32Value = (Integer) value;
-        writeUInt32(number, uint32Value);
-        break;
-      case InternalNano.TYPE_ENUM:
-        Integer enumValue = (Integer) value;
-        writeEnum(number, enumValue);
-        break;
-      case InternalNano.TYPE_SFIXED32:
-        Integer sfixed32Value = (Integer) value;
-        writeSFixed32(number, sfixed32Value);
-        break;
-      case InternalNano.TYPE_SFIXED64:
-        Long sfixed64Value = (Long) value;
-        writeSFixed64(number, sfixed64Value);
-        break;
-      case InternalNano.TYPE_SINT32:
-        Integer sint32Value = (Integer) value;
-        writeSInt32(number, sint32Value);
-        break;
-      case InternalNano.TYPE_SINT64:
-        Long sint64Value = (Long) value;
-        writeSInt64(number, sint64Value);
-        break;
-      case InternalNano.TYPE_MESSAGE:
-        MessageNano messageValue = (MessageNano) value;
-        writeMessage(number, messageValue);
-        break;
-      case InternalNano.TYPE_GROUP:
-        MessageNano groupValue = (MessageNano) value;
-        writeGroup(number, groupValue);
-        break;
-      default:
-        throw new IOException("Unknown type: " + type);
-    }
-  }
-
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java b/javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java
deleted file mode 100644
index 87973d76..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/ExtendableMessageNano.java
+++ /dev/null
@@ -1,169 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-
-/**
- * Base class of those Protocol Buffer messages that need to store unknown fields,
- * such as extensions.
- */
-public abstract class ExtendableMessageNano<M extends ExtendableMessageNano<M>>
-        extends MessageNano {
-    /**
-     * A container for fields unknown to the message, including extensions. Extension fields can
-     * can be accessed through the {@link #getExtension} and {@link #setExtension} methods.
-     */
-    protected FieldArray unknownFieldData;
-
-    @Override
-    protected int computeSerializedSize() {
-        int size = 0;
-        if (unknownFieldData != null) {
-            for (int i = 0; i < unknownFieldData.size(); i++) {
-                FieldData field = unknownFieldData.dataAt(i);
-                size += field.computeSerializedSize();
-            }
-        }
-        return size;
-    }
-
-    @Override
-    public void writeTo(CodedOutputByteBufferNano output) throws IOException {
-        if (unknownFieldData == null) {
-            return;
-        }
-        for (int i = 0; i < unknownFieldData.size(); i++) {
-            FieldData field = unknownFieldData.dataAt(i);
-            field.writeTo(output);
-        }
-    }
-
-    /**
-     * Checks if there is a value stored for the specified extension in this
-     * message.
-     */
-    public final boolean hasExtension(Extension<M, ?> extension) {
-        if (unknownFieldData == null) {
-            return false;
-        }
-        FieldData field = unknownFieldData.get(WireFormatNano.getTagFieldNumber(extension.tag));
-        return field != null;
-    }
-
-    /**
-     * Gets the value stored in the specified extension of this message.
-     */
-    public final <T> T getExtension(Extension<M, T> extension) {
-        if (unknownFieldData == null) {
-            return null;
-        }
-        FieldData field = unknownFieldData.get(WireFormatNano.getTagFieldNumber(extension.tag));
-        return field == null ? null : field.getValue(extension);
-    }
-
-    /**
-     * Sets the value of the specified extension of this message.
-     */
-    public final <T> M setExtension(Extension<M, T> extension, T value) {
-        int fieldNumber = WireFormatNano.getTagFieldNumber(extension.tag);
-        if (value == null) {
-            if (unknownFieldData != null) {
-                unknownFieldData.remove(fieldNumber);
-                if (unknownFieldData.isEmpty()) {
-                    unknownFieldData = null;
-                }
-            }
-        } else {
-            FieldData field = null;
-            if (unknownFieldData == null) {
-                unknownFieldData = new FieldArray();
-            } else {
-                field = unknownFieldData.get(fieldNumber);
-            }
-            if (field == null) {
-                unknownFieldData.put(fieldNumber, new FieldData(extension, value));
-            } else {
-                field.setValue(extension, value);
-            }
-        }
-
-        @SuppressWarnings("unchecked") // Generated code should guarantee type safety
-        M typedThis = (M) this;
-        return typedThis;
-    }
-
-    /**
-     * Stores the binary data of an unknown field.
-     *
-     * <p>Generated messages will call this for unknown fields if the store_unknown_fields
-     * option is on.
-     *
-     * <p>Note that the tag might be a end-group tag (rather than the start of an unknown field) in
-     * which case we do not want to add an unknown field entry.
-     *
-     * @param input the input buffer.
-     * @param tag the tag of the field.
-
-     * @return {@literal true} unless the tag is an end-group tag.
-     */
-    protected final boolean storeUnknownField(CodedInputByteBufferNano input, int tag)
-            throws IOException {
-        int startPos = input.getPosition();
-        if (!input.skipField(tag)) {
-            return false;  // This wasn't an unknown field, it's an end-group tag.
-        }
-        int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
-        int endPos = input.getPosition();
-        byte[] bytes = input.getData(startPos, endPos - startPos);
-        UnknownFieldData unknownField = new UnknownFieldData(tag, bytes);
-
-        FieldData field = null;
-        if (unknownFieldData == null) {
-            unknownFieldData = new FieldArray();
-        } else {
-            field = unknownFieldData.get(fieldNumber);
-        }
-        if (field == null) {
-            field = new FieldData();
-            unknownFieldData.put(fieldNumber, field);
-        }
-        field.addUnknownField(unknownField);
-        return true;
-    }
-
-    @Override
-    public M clone() throws CloneNotSupportedException {
-        M cloned = (M) super.clone();
-        InternalNano.cloneUnknownFieldData(this, cloned);
-        return cloned;
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/Extension.java b/javanano/src/main/java/com/google/protobuf/nano/Extension.java
deleted file mode 100644
index c458f9b1..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/Extension.java
+++ /dev/null
@@ -1,706 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-import java.lang.reflect.Array;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Represents an extension.
- *
- * @author bduff@google.com (Brian Duff)
- * @author maxtroy@google.com (Max Cai)
- * @param <M> the type of the extendable message this extension is for.
- * @param <T> the Java type of the extension; see {@link #clazz}.
- */
-public class Extension<M extends ExtendableMessageNano<M>, T> {
-
-    /*
-     * Because we typically only define message-typed extensions, the Extension class hierarchy is
-     * designed as follows, to allow a big amount of code in this file to be removed by ProGuard:
-     *
-     *            Extension          // ready to use for message/group typed extensions
-     *                Δ
-     *                |
-     *       PrimitiveExtension      // for primitive/enum typed extensions
-     */
-
-    public static final int TYPE_DOUBLE   = InternalNano.TYPE_DOUBLE;
-    public static final int TYPE_FLOAT    = InternalNano.TYPE_FLOAT;
-    public static final int TYPE_INT64    = InternalNano.TYPE_INT64;
-    public static final int TYPE_UINT64   = InternalNano.TYPE_UINT64;
-    public static final int TYPE_INT32    = InternalNano.TYPE_INT32;
-    public static final int TYPE_FIXED64  = InternalNano.TYPE_FIXED64;
-    public static final int TYPE_FIXED32  = InternalNano.TYPE_FIXED32;
-    public static final int TYPE_BOOL     = InternalNano.TYPE_BOOL;
-    public static final int TYPE_STRING   = InternalNano.TYPE_STRING;
-    public static final int TYPE_GROUP    = InternalNano.TYPE_GROUP;
-    public static final int TYPE_MESSAGE  = InternalNano.TYPE_MESSAGE;
-    public static final int TYPE_BYTES    = InternalNano.TYPE_BYTES;
-    public static final int TYPE_UINT32   = InternalNano.TYPE_UINT32;
-    public static final int TYPE_ENUM     = InternalNano.TYPE_ENUM;
-    public static final int TYPE_SFIXED32 = InternalNano.TYPE_SFIXED32;
-    public static final int TYPE_SFIXED64 = InternalNano.TYPE_SFIXED64;
-    public static final int TYPE_SINT32   = InternalNano.TYPE_SINT32;
-    public static final int TYPE_SINT64   = InternalNano.TYPE_SINT64;
-
-    /**
-     * Creates an {@code Extension} of the given message type and tag number.
-     * Should be used by the generated code only.
-     *
-     * @param type {@link #TYPE_MESSAGE} or {@link #TYPE_GROUP}
-     * @deprecated use {@link #createMessageTyped(int, Class, long)} instead.
-     */
-    @Deprecated
-    public static <M extends ExtendableMessageNano<M>, T extends MessageNano>
-            Extension<M, T> createMessageTyped(int type, Class<T> clazz, int tag) {
-        return new Extension<M, T>(type, clazz, tag, false);
-    }
-
-    // Note: these create...() methods take a long for the tag parameter,
-    // because tags are represented as unsigned ints, and these values exist
-    // in generated code as long values. However, they can fit in 32-bits, so
-    // it's safe to cast them to int without loss of precision.
-
-    /**
-     * Creates an {@code Extension} of the given message type and tag number.
-     * Should be used by the generated code only.
-     *
-     * @param type {@link #TYPE_MESSAGE} or {@link #TYPE_GROUP}
-     */
-    public static <M extends ExtendableMessageNano<M>, T extends MessageNano>
-            Extension<M, T> createMessageTyped(int type, Class<T> clazz, long tag) {
-        return new Extension<M, T>(type, clazz, (int) tag, false);
-    }
-
-    /**
-     * Creates a repeated {@code Extension} of the given message type and tag number.
-     * Should be used by the generated code only.
-     *
-     * @param type {@link #TYPE_MESSAGE} or {@link #TYPE_GROUP}
-     */
-    public static <M extends ExtendableMessageNano<M>, T extends MessageNano>
-            Extension<M, T[]> createRepeatedMessageTyped(int type, Class<T[]> clazz, long tag) {
-        return new Extension<M, T[]>(type, clazz, (int) tag, true);
-    }
-
-    /**
-     * Creates an {@code Extension} of the given primitive type and tag number.
-     * Should be used by the generated code only.
-     *
-     * @param type one of {@code TYPE_*}, except {@link #TYPE_MESSAGE} and {@link #TYPE_GROUP}
-     * @param clazz the boxed Java type of this extension
-     */
-    public static <M extends ExtendableMessageNano<M>, T>
-            Extension<M, T> createPrimitiveTyped(int type, Class<T> clazz, long tag) {
-        return new PrimitiveExtension<M, T>(type, clazz, (int) tag, false, 0, 0);
-    }
-
-    /**
-     * Creates a repeated {@code Extension} of the given primitive type and tag number.
-     * Should be used by the generated code only.
-     *
-     * @param type one of {@code TYPE_*}, except {@link #TYPE_MESSAGE} and {@link #TYPE_GROUP}
-     * @param clazz the Java array type of this extension, with an unboxed component type
-     */
-    public static <M extends ExtendableMessageNano<M>, T>
-            Extension<M, T> createRepeatedPrimitiveTyped(
-                    int type, Class<T> clazz, long tag, long nonPackedTag, long packedTag) {
-        return new PrimitiveExtension<M, T>(type, clazz, (int) tag, true,
-            (int) nonPackedTag, (int) packedTag);
-    }
-
-    /**
-     * Protocol Buffer type of this extension; one of the {@code TYPE_} constants.
-     */
-    protected final int type;
-
-    /**
-     * Java type of this extension. For a singular extension, this is the boxed Java type for the
-     * Protocol Buffer {@link #type}; for a repeated extension, this is an array type whose
-     * component type is the unboxed Java type for {@link #type}. For example, for a singular
-     * {@code int32}/{@link #TYPE_INT32} extension, this equals {@code Integer.class}; for a
-     * repeated {@code int32} extension, this equals {@code int[].class}.
-     */
-    protected final Class<T> clazz;
-
-    /**
-     * Tag number of this extension. The data should be viewed as an unsigned 32-bit value.
-     */
-    public final int tag;
-
-    /**
-     * Whether this extension is repeated.
-     */
-    protected final boolean repeated;
-
-    private Extension(int type, Class<T> clazz, int tag, boolean repeated) {
-        this.type = type;
-        this.clazz = clazz;
-        this.tag = tag;
-        this.repeated = repeated;
-    }
-
-    /**
-     * Returns the value of this extension stored in the given list of unknown fields, or
-     * {@code null} if no unknown fields matches this extension.
-     *
-     * @param unknownFields a list of {@link UnknownFieldData}. All of the elements must have a tag
-     *                      that matches this Extension's tag.
-     *
-     */
-    final T getValueFrom(List<UnknownFieldData> unknownFields) {
-        if (unknownFields == null) {
-            return null;
-        }
-        return repeated ? getRepeatedValueFrom(unknownFields) : getSingularValueFrom(unknownFields);
-    }
-
-    private T getRepeatedValueFrom(List<UnknownFieldData> unknownFields) {
-        // For repeated extensions, read all matching unknown fields in their original order.
-        List<Object> resultList = new ArrayList<Object>();
-        for (int i = 0; i < unknownFields.size(); i++) {
-            UnknownFieldData data = unknownFields.get(i);
-            if (data.bytes.length != 0) {
-                readDataInto(data, resultList);
-            }
-        }
-
-        int resultSize = resultList.size();
-        if (resultSize == 0) {
-            return null;
-        } else {
-            T result = clazz.cast(Array.newInstance(clazz.getComponentType(), resultSize));
-            for (int i = 0; i < resultSize; i++) {
-                Array.set(result, i, resultList.get(i));
-            }
-            return result;
-        }
-    }
-
-    private T getSingularValueFrom(List<UnknownFieldData> unknownFields) {
-        // For singular extensions, get the last piece of data stored under this extension.
-        if (unknownFields.isEmpty()) {
-            return null;
-        }
-        UnknownFieldData lastData = unknownFields.get(unknownFields.size() - 1);
-        return clazz.cast(readData(CodedInputByteBufferNano.newInstance(lastData.bytes)));
-    }
-
-    protected Object readData(CodedInputByteBufferNano input) {
-        // This implementation is for message/group extensions.
-        Class<?> messageType = repeated ? clazz.getComponentType() : clazz;
-        try {
-            switch (type) {
-                case TYPE_GROUP:
-                    MessageNano group = (MessageNano) messageType.newInstance();
-                    input.readGroup(group, WireFormatNano.getTagFieldNumber(tag));
-                    return group;
-                case TYPE_MESSAGE:
-                    MessageNano message = (MessageNano) messageType.newInstance();
-                    input.readMessage(message);
-                    return message;
-                default:
-                    throw new IllegalArgumentException("Unknown type " + type);
-            }
-        } catch (InstantiationException e) {
-            throw new IllegalArgumentException(
-                    "Error creating instance of class " + messageType, e);
-        } catch (IllegalAccessException e) {
-            throw new IllegalArgumentException(
-                    "Error creating instance of class " + messageType, e);
-        } catch (IOException e) {
-            throw new IllegalArgumentException("Error reading extension field", e);
-        }
-    }
-
-    protected void readDataInto(UnknownFieldData data, List<Object> resultList) {
-        // This implementation is for message/group extensions.
-        resultList.add(readData(CodedInputByteBufferNano.newInstance(data.bytes)));
-    }
-
-    void writeTo(Object value, CodedOutputByteBufferNano output) throws IOException {
-        if (repeated) {
-            writeRepeatedData(value, output);
-        } else {
-            writeSingularData(value, output);
-        }
-    }
-
-    protected void writeSingularData(Object value, CodedOutputByteBufferNano out) {
-        // This implementation is for message/group extensions.
-        try {
-            out.writeRawVarint32(tag);
-            switch (type) {
-                case TYPE_GROUP:
-                    MessageNano groupValue = (MessageNano) value;
-                    int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
-                    out.writeGroupNoTag(groupValue);
-                    // The endgroup tag must be included in the data payload.
-                    out.writeTag(fieldNumber, WireFormatNano.WIRETYPE_END_GROUP);
-                    break;
-                case TYPE_MESSAGE:
-                    MessageNano messageValue = (MessageNano) value;
-                    out.writeMessageNoTag(messageValue);
-                    break;
-                default:
-                    throw new IllegalArgumentException("Unknown type " + type);
-            }
-        } catch (IOException e) {
-            // Should not happen
-            throw new IllegalStateException(e);
-        }
-    }
-
-    protected void writeRepeatedData(Object array, CodedOutputByteBufferNano output) {
-        // This implementation is for non-packed extensions.
-        int arrayLength = Array.getLength(array);
-        for (int i = 0; i < arrayLength; i++) {
-            Object element = Array.get(array, i);
-            if (element != null) {
-                writeSingularData(element, output);
-            }
-        }
-    }
-
-    int computeSerializedSize(Object value) {
-        if (repeated) {
-            return computeRepeatedSerializedSize(value);
-        } else {
-            return computeSingularSerializedSize(value);
-        }
-    }
-
-    protected int computeRepeatedSerializedSize(Object array) {
-        // This implementation is for non-packed extensions.
-        int size = 0;
-        int arrayLength = Array.getLength(array);
-        for (int i = 0; i < arrayLength; i++) {
-            Object element = Array.get(array, i);
-            if (element != null) {
-                size += computeSingularSerializedSize(Array.get(array, i));
-            }
-        }
-        return size;
-    }
-
-    protected int computeSingularSerializedSize(Object value) {
-        // This implementation is for message/group extensions.
-        int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
-        switch (type) {
-            case TYPE_GROUP:
-                MessageNano groupValue = (MessageNano) value;
-                return CodedOutputByteBufferNano.computeGroupSize(fieldNumber, groupValue);
-            case TYPE_MESSAGE:
-                MessageNano messageValue = (MessageNano) value;
-                return CodedOutputByteBufferNano.computeMessageSize(fieldNumber, messageValue);
-            default:
-                throw new IllegalArgumentException("Unknown type " + type);
-        }
-    }
-
-    /**
-     * Represents an extension of a primitive (including enum) type. If there is no primitive
-     * extensions, this subclass will be removable by ProGuard.
-     */
-    private static class PrimitiveExtension<M extends ExtendableMessageNano<M>, T>
-            extends Extension<M, T> {
-
-        /**
-         * Tag of a piece of non-packed data from the wire compatible with this extension.
-         */
-        private final int nonPackedTag;
-
-        /**
-         * Tag of a piece of packed data from the wire compatible with this extension.
-         * 0 if the type of this extension is not packable.
-         */
-        private final int packedTag;
-
-        public PrimitiveExtension(int type, Class<T> clazz, int tag, boolean repeated,
-                int nonPackedTag, int packedTag) {
-            super(type, clazz, tag, repeated);
-            this.nonPackedTag = nonPackedTag;
-            this.packedTag = packedTag;
-        }
-
-        @Override
-        protected Object readData(CodedInputByteBufferNano input) {
-            try {
-              return input.readPrimitiveField(type);
-            } catch (IOException e) {
-                throw new IllegalArgumentException("Error reading extension field", e);
-            }
-        }
-
-        @Override
-        protected void readDataInto(UnknownFieldData data, List<Object> resultList) {
-            // This implementation is for primitive typed extensions,
-            // which can read both packed and non-packed data.
-            if (data.tag == nonPackedTag) {
-                resultList.add(readData(CodedInputByteBufferNano.newInstance(data.bytes)));
-            } else {
-                CodedInputByteBufferNano buffer =
-                        CodedInputByteBufferNano.newInstance(data.bytes);
-                try {
-                    buffer.pushLimit(buffer.readRawVarint32()); // length limit
-                } catch (IOException e) {
-                    throw new IllegalArgumentException("Error reading extension field", e);
-                }
-                while (!buffer.isAtEnd()) {
-                    resultList.add(readData(buffer));
-                }
-            }
-        }
-
-        @Override
-        protected final void writeSingularData(Object value, CodedOutputByteBufferNano output) {
-            try {
-                output.writeRawVarint32(tag);
-                switch (type) {
-                    case TYPE_DOUBLE:
-                        Double doubleValue = (Double) value;
-                        output.writeDoubleNoTag(doubleValue);
-                        break;
-                    case TYPE_FLOAT:
-                        Float floatValue = (Float) value;
-                        output.writeFloatNoTag(floatValue);
-                        break;
-                    case TYPE_INT64:
-                        Long int64Value = (Long) value;
-                        output.writeInt64NoTag(int64Value);
-                        break;
-                    case TYPE_UINT64:
-                        Long uint64Value = (Long) value;
-                        output.writeUInt64NoTag(uint64Value);
-                        break;
-                    case TYPE_INT32:
-                        Integer int32Value = (Integer) value;
-                        output.writeInt32NoTag(int32Value);
-                        break;
-                    case TYPE_FIXED64:
-                        Long fixed64Value = (Long) value;
-                        output.writeFixed64NoTag(fixed64Value);
-                        break;
-                    case TYPE_FIXED32:
-                        Integer fixed32Value = (Integer) value;
-                        output.writeFixed32NoTag(fixed32Value);
-                        break;
-                    case TYPE_BOOL:
-                        Boolean boolValue = (Boolean) value;
-                        output.writeBoolNoTag(boolValue);
-                        break;
-                    case TYPE_STRING:
-                        String stringValue = (String) value;
-                        output.writeStringNoTag(stringValue);
-                        break;
-                    case TYPE_BYTES:
-                        byte[] bytesValue = (byte[]) value;
-                        output.writeBytesNoTag(bytesValue);
-                        break;
-                    case TYPE_UINT32:
-                        Integer uint32Value = (Integer) value;
-                        output.writeUInt32NoTag(uint32Value);
-                        break;
-                    case TYPE_ENUM:
-                        Integer enumValue = (Integer) value;
-                        output.writeEnumNoTag(enumValue);
-                        break;
-                    case TYPE_SFIXED32:
-                        Integer sfixed32Value = (Integer) value;
-                        output.writeSFixed32NoTag(sfixed32Value);
-                        break;
-                    case TYPE_SFIXED64:
-                        Long sfixed64Value = (Long) value;
-                        output.writeSFixed64NoTag(sfixed64Value);
-                        break;
-                    case TYPE_SINT32:
-                        Integer sint32Value = (Integer) value;
-                        output.writeSInt32NoTag(sint32Value);
-                        break;
-                    case TYPE_SINT64:
-                        Long sint64Value = (Long) value;
-                        output.writeSInt64NoTag(sint64Value);
-                        break;
-                    default:
-                        throw new IllegalArgumentException("Unknown type " + type);
-                }
-            } catch (IOException e) {
-                // Should not happen
-                throw new IllegalStateException(e);
-            }
-        }
-
-        @Override
-        protected void writeRepeatedData(Object array, CodedOutputByteBufferNano output) {
-            if (tag == nonPackedTag) {
-                // Use base implementation for non-packed data
-                super.writeRepeatedData(array, output);
-            } else if (tag == packedTag) {
-                // Packed. Note that the array element type is guaranteed to be primitive, so there
-                // won't be any null elements, so no null check in this block.
-                int arrayLength = Array.getLength(array);
-                int dataSize = computePackedDataSize(array);
-
-                try {
-                    output.writeRawVarint32(tag);
-                    output.writeRawVarint32(dataSize);
-                    switch (type) {
-                        case TYPE_BOOL:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeBoolNoTag(Array.getBoolean(array, i));
-                            }
-                            break;
-                        case TYPE_FIXED32:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeFixed32NoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        case TYPE_SFIXED32:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeSFixed32NoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        case TYPE_FLOAT:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeFloatNoTag(Array.getFloat(array, i));
-                            }
-                            break;
-                        case TYPE_FIXED64:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeFixed64NoTag(Array.getLong(array, i));
-                            }
-                            break;
-                        case TYPE_SFIXED64:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeSFixed64NoTag(Array.getLong(array, i));
-                            }
-                            break;
-                        case TYPE_DOUBLE:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeDoubleNoTag(Array.getDouble(array, i));
-                            }
-                            break;
-                        case TYPE_INT32:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeInt32NoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        case TYPE_SINT32:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeSInt32NoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        case TYPE_UINT32:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeUInt32NoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        case TYPE_INT64:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeInt64NoTag(Array.getLong(array, i));
-                            }
-                            break;
-                        case TYPE_SINT64:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeSInt64NoTag(Array.getLong(array, i));
-                            }
-                            break;
-                        case TYPE_UINT64:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeUInt64NoTag(Array.getLong(array, i));
-                            }
-                            break;
-                        case TYPE_ENUM:
-                            for (int i = 0; i < arrayLength; i++) {
-                                output.writeEnumNoTag(Array.getInt(array, i));
-                            }
-                            break;
-                        default:
-                            throw new IllegalArgumentException("Unpackable type " + type);
-                    }
-                } catch (IOException e) {
-                    // Should not happen.
-                    throw new IllegalStateException(e);
-                }
-            } else {
-                throw new IllegalArgumentException("Unexpected repeated extension tag " + tag
-                        + ", unequal to both non-packed variant " + nonPackedTag
-                        + " and packed variant " + packedTag);
-            }
-        }
-
-        private int computePackedDataSize(Object array) {
-            int dataSize = 0;
-            int arrayLength = Array.getLength(array);
-            switch (type) {
-                case TYPE_BOOL:
-                    // Bools are stored as int32 but just as 0 or 1, so 1 byte each.
-                    dataSize = arrayLength;
-                    break;
-                case TYPE_FIXED32:
-                case TYPE_SFIXED32:
-                case TYPE_FLOAT:
-                    dataSize = arrayLength * CodedOutputByteBufferNano.LITTLE_ENDIAN_32_SIZE;
-                    break;
-                case TYPE_FIXED64:
-                case TYPE_SFIXED64:
-                case TYPE_DOUBLE:
-                    dataSize = arrayLength * CodedOutputByteBufferNano.LITTLE_ENDIAN_64_SIZE;
-                    break;
-                case TYPE_INT32:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeInt32SizeNoTag(
-                                Array.getInt(array, i));
-                    }
-                    break;
-                case TYPE_SINT32:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeSInt32SizeNoTag(
-                                Array.getInt(array, i));
-                    }
-                    break;
-                case TYPE_UINT32:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeUInt32SizeNoTag(
-                                Array.getInt(array, i));
-                    }
-                    break;
-                case TYPE_INT64:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeInt64SizeNoTag(
-                                Array.getLong(array, i));
-                    }
-                    break;
-                case TYPE_SINT64:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeSInt64SizeNoTag(
-                                Array.getLong(array, i));
-                    }
-                    break;
-                case TYPE_UINT64:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeUInt64SizeNoTag(
-                                Array.getLong(array, i));
-                    }
-                    break;
-                case TYPE_ENUM:
-                    for (int i = 0; i < arrayLength; i++) {
-                        dataSize += CodedOutputByteBufferNano.computeEnumSizeNoTag(
-                                Array.getInt(array, i));
-                    }
-                    break;
-                default:
-                    throw new IllegalArgumentException("Unexpected non-packable type " + type);
-            }
-            return dataSize;
-        }
-
-        @Override
-        protected int computeRepeatedSerializedSize(Object array) {
-            if (tag == nonPackedTag) {
-                // Use base implementation for non-packed data
-                return super.computeRepeatedSerializedSize(array);
-            } else if (tag == packedTag) {
-                // Packed.
-                int dataSize = computePackedDataSize(array);
-                int payloadSize =
-                        dataSize + CodedOutputByteBufferNano.computeRawVarint32Size(dataSize);
-                return payloadSize + CodedOutputByteBufferNano.computeRawVarint32Size(tag);
-            } else {
-                throw new IllegalArgumentException("Unexpected repeated extension tag " + tag
-                        + ", unequal to both non-packed variant " + nonPackedTag
-                        + " and packed variant " + packedTag);
-            }
-        }
-
-        @Override
-        protected final int computeSingularSerializedSize(Object value) {
-            int fieldNumber = WireFormatNano.getTagFieldNumber(tag);
-            switch (type) {
-                case TYPE_DOUBLE:
-                    Double doubleValue = (Double) value;
-                    return CodedOutputByteBufferNano.computeDoubleSize(fieldNumber, doubleValue);
-                case TYPE_FLOAT:
-                    Float floatValue = (Float) value;
-                    return CodedOutputByteBufferNano.computeFloatSize(fieldNumber, floatValue);
-                case TYPE_INT64:
-                    Long int64Value = (Long) value;
-                    return CodedOutputByteBufferNano.computeInt64Size(fieldNumber, int64Value);
-                case TYPE_UINT64:
-                    Long uint64Value = (Long) value;
-                    return CodedOutputByteBufferNano.computeUInt64Size(fieldNumber, uint64Value);
-                case TYPE_INT32:
-                    Integer int32Value = (Integer) value;
-                    return CodedOutputByteBufferNano.computeInt32Size(fieldNumber, int32Value);
-                case TYPE_FIXED64:
-                    Long fixed64Value = (Long) value;
-                    return CodedOutputByteBufferNano.computeFixed64Size(fieldNumber, fixed64Value);
-                case TYPE_FIXED32:
-                    Integer fixed32Value = (Integer) value;
-                    return CodedOutputByteBufferNano.computeFixed32Size(fieldNumber, fixed32Value);
-                case TYPE_BOOL:
-                    Boolean boolValue = (Boolean) value;
-                    return CodedOutputByteBufferNano.computeBoolSize(fieldNumber, boolValue);
-                case TYPE_STRING:
-                    String stringValue = (String) value;
-                    return CodedOutputByteBufferNano.computeStringSize(fieldNumber, stringValue);
-                case TYPE_BYTES:
-                    byte[] bytesValue = (byte[]) value;
-                    return CodedOutputByteBufferNano.computeBytesSize(fieldNumber, bytesValue);
-                case TYPE_UINT32:
-                    Integer uint32Value = (Integer) value;
-                    return CodedOutputByteBufferNano.computeUInt32Size(fieldNumber, uint32Value);
-                case TYPE_ENUM:
-                    Integer enumValue = (Integer) value;
-                    return CodedOutputByteBufferNano.computeEnumSize(fieldNumber, enumValue);
-                case TYPE_SFIXED32:
-                    Integer sfixed32Value = (Integer) value;
-                    return CodedOutputByteBufferNano.computeSFixed32Size(fieldNumber,
-                            sfixed32Value);
-                case TYPE_SFIXED64:
-                    Long sfixed64Value = (Long) value;
-                    return CodedOutputByteBufferNano.computeSFixed64Size(fieldNumber,
-                            sfixed64Value);
-                case TYPE_SINT32:
-                    Integer sint32Value = (Integer) value;
-                    return CodedOutputByteBufferNano.computeSInt32Size(fieldNumber, sint32Value);
-                case TYPE_SINT64:
-                    Long sint64Value = (Long) value;
-                    return CodedOutputByteBufferNano.computeSInt64Size(fieldNumber, sint64Value);
-                default:
-                    throw new IllegalArgumentException("Unknown type " + type);
-            }
-        }
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/FieldArray.java b/javanano/src/main/java/com/google/protobuf/nano/FieldArray.java
deleted file mode 100644
index b49a97fa..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/FieldArray.java
+++ /dev/null
@@ -1,291 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2014 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-
-/**
- * A custom version of {@code android.util.SparseArray} with the minimal API
- * for storing {@link FieldData} objects.
- *
- * <p>This class is an internal implementation detail of nano and should not
- * be called directly by clients.
- *
- * Based on {@code android.support.v4.util.SpareArrayCompat}.
- */
-public final class FieldArray implements Cloneable {
-    private static final FieldData DELETED = new FieldData();
-    private boolean mGarbage = false;
-
-    private int[] mFieldNumbers;
-    private FieldData[] mData;
-    private int mSize;
-
-    /**
-     * Creates a new FieldArray containing no fields.
-     */
-    FieldArray() {
-        this(10);
-    }
-
-    /**
-     * Creates a new FieldArray containing no mappings that will not
-     * require any additional memory allocation to store the specified
-     * number of mappings.
-     */
-    FieldArray(int initialCapacity) {
-        initialCapacity = idealIntArraySize(initialCapacity);
-        mFieldNumbers = new int[initialCapacity];
-        mData = new FieldData[initialCapacity];
-        mSize = 0;
-    }
-
-    /**
-     * Gets the FieldData mapped from the specified fieldNumber, or <code>null</code>
-     * if no such mapping has been made.
-     */
-    FieldData get(int fieldNumber) {
-        int i = binarySearch(fieldNumber);
-
-        if (i < 0 || mData[i] == DELETED) {
-            return null;
-        } else {
-            return mData[i];
-        }
-    }
-
-    /**
-     * Removes the data from the specified fieldNumber, if there was any.
-     */
-    void remove(int fieldNumber) {
-        int i = binarySearch(fieldNumber);
-
-        if (i >= 0 && mData[i] != DELETED) {
-            mData[i] = DELETED;
-            mGarbage = true;
-        }
-    }
-
-    private void gc() {
-        int n = mSize;
-        int o = 0;
-        int[] keys = mFieldNumbers;
-        FieldData[] values = mData;
-
-        for (int i = 0; i < n; i++) {
-            FieldData val = values[i];
-
-            if (val != DELETED) {
-                if (i != o) {
-                    keys[o] = keys[i];
-                    values[o] = val;
-                    values[i] = null;
-                }
-
-                o++;
-            }
-        }
-
-        mGarbage = false;
-        mSize = o;
-    }
-
-    /**
-     * Adds a mapping from the specified fieldNumber to the specified data,
-     * replacing the previous mapping if there was one.
-     */
-    void put(int fieldNumber, FieldData data) {
-        int i = binarySearch(fieldNumber);
-
-        if (i >= 0) {
-            mData[i] = data;
-        } else {
-            i = ~i;
-
-            if (i < mSize && mData[i] == DELETED) {
-                mFieldNumbers[i] = fieldNumber;
-                mData[i] = data;
-                return;
-            }
-
-            if (mGarbage && mSize >= mFieldNumbers.length) {
-                gc();
-
-                // Search again because indices may have changed.
-                i = ~ binarySearch(fieldNumber);
-            }
-
-            if (mSize >= mFieldNumbers.length) {
-                int n = idealIntArraySize(mSize + 1);
-
-                int[] nkeys = new int[n];
-                FieldData[] nvalues = new FieldData[n];
-
-                System.arraycopy(mFieldNumbers, 0, nkeys, 0, mFieldNumbers.length);
-                System.arraycopy(mData, 0, nvalues, 0, mData.length);
-
-                mFieldNumbers = nkeys;
-                mData = nvalues;
-            }
-
-            if (mSize - i != 0) {
-                System.arraycopy(mFieldNumbers, i, mFieldNumbers, i + 1, mSize - i);
-                System.arraycopy(mData, i, mData, i + 1, mSize - i);
-            }
-
-            mFieldNumbers[i] = fieldNumber;
-            mData[i] = data;
-            mSize++;
-        }
-    }
-
-    /**
-     * Returns the number of key-value mappings that this FieldArray
-     * currently stores.
-     */
-    int size() {
-        if (mGarbage) {
-            gc();
-        }
-
-        return mSize;
-    }
-
-    public boolean isEmpty() {
-        return size() == 0;
-    }
-
-    /**
-     * Given an index in the range <code>0...size()-1</code>, returns
-     * the value from the <code>index</code>th key-value mapping that this
-     * FieldArray stores.
-     */
-    FieldData dataAt(int index) {
-        if (mGarbage) {
-            gc();
-        }
-
-        return mData[index];
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (o == this) {
-            return true;
-        }
-        if (!(o instanceof FieldArray)) {
-            return false;
-        }
-
-        FieldArray other = (FieldArray) o;
-        if (size() != other.size()) {  // size() will call gc() if necessary.
-            return false;
-        }
-        return arrayEquals(mFieldNumbers, other.mFieldNumbers, mSize) &&
-                arrayEquals(mData, other.mData, mSize);
-    }
-
-    @Override
-    public int hashCode() {
-        if (mGarbage) {
-            gc();
-        }
-        int result = 17;
-        for (int i = 0; i < mSize; i++) {
-            result = 31 * result + mFieldNumbers[i];
-            result = 31 * result + mData[i].hashCode();
-        }
-        return result;
-    }
-
-    private int idealIntArraySize(int need) {
-        return idealByteArraySize(need * 4) / 4;
-    }
-
-    private int idealByteArraySize(int need) {
-        for (int i = 4; i < 32; i++)
-            if (need <= (1 << i) - 12)
-                return (1 << i) - 12;
-
-        return need;
-    }
-
-    private int binarySearch(int value) {
-        int lo = 0;
-        int hi = mSize - 1;
-
-        while (lo <= hi) {
-            int mid = (lo + hi) >>> 1;
-            int midVal = mFieldNumbers[mid];
-
-            if (midVal < value) {
-                lo = mid + 1;
-            } else if (midVal > value) {
-                hi = mid - 1;
-            } else {
-                return mid; // value found
-            }
-        }
-        return ~lo; // value not present
-    }
-
-    private boolean arrayEquals(int[] a, int[] b, int size) {
-        for (int i = 0; i < size; i++) {
-            if (a[i] != b[i]) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    private boolean arrayEquals(FieldData[] a, FieldData[] b, int size) {
-        for (int i = 0; i < size; i++) {
-            if (!a[i].equals(b[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    @Override
-    public final FieldArray clone() {
-        // Trigger GC so we compact and don't copy DELETED elements.
-        int size = size();
-        FieldArray clone = new FieldArray(size);
-        System.arraycopy(mFieldNumbers, 0, clone.mFieldNumbers, 0, size);
-        for (int i = 0; i < size; i++) {
-            if (mData[i] != null) {
-                clone.mData[i] = mData[i].clone();
-            }
-        }
-        clone.mSize = size;
-        return clone;
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/FieldData.java b/javanano/src/main/java/com/google/protobuf/nano/FieldData.java
deleted file mode 100644
index ebebabc8..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/FieldData.java
+++ /dev/null
@@ -1,240 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2014 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-
-/**
- * Stores unknown fields. These might be extensions or fields that the generated API doesn't
- * know about yet.
- */
-class FieldData implements Cloneable {
-    private Extension<?, ?> cachedExtension;
-    private Object value;
-    /** The serialised values for this object. Will be cleared if getValue is called */
-    private List<UnknownFieldData> unknownFieldData;
-
-    <T> FieldData(Extension<?, T> extension, T newValue) {
-        cachedExtension = extension;
-        value = newValue;
-    }
-
-    FieldData() {
-        unknownFieldData = new ArrayList<UnknownFieldData>();
-    }
-
-    void addUnknownField(UnknownFieldData unknownField) {
-        unknownFieldData.add(unknownField);
-    }
-
-    UnknownFieldData getUnknownField(int index) {
-        if (unknownFieldData == null) {
-            return null;
-        }
-        if (index < unknownFieldData.size()) {
-            return unknownFieldData.get(index);
-        }
-        return null;
-    }
-
-    int getUnknownFieldSize() {
-        if (unknownFieldData == null) {
-            return 0;
-        }
-        return unknownFieldData.size();
-    }
-
-    <T> T getValue(Extension<?, T> extension) {
-        if (value != null){
-            if (cachedExtension != extension) {  // Extension objects are singletons.
-                throw new IllegalStateException(
-                        "Tried to getExtension with a differernt Extension.");
-            }
-        } else {
-            cachedExtension = extension;
-            value = extension.getValueFrom(unknownFieldData);
-            unknownFieldData = null;
-        }
-        return (T) value;
-    }
-
-    <T> void setValue(Extension<?, T> extension, T newValue) {
-        cachedExtension = extension;
-        value = newValue;
-        unknownFieldData = null;
-    }
-
-    int computeSerializedSize() {
-        int size = 0;
-        if (value != null) {
-            size = cachedExtension.computeSerializedSize(value);
-        } else {
-            for (UnknownFieldData unknownField : unknownFieldData) {
-                size += unknownField.computeSerializedSize();
-            }
-        }
-        return size;
-    }
-
-    void writeTo(CodedOutputByteBufferNano output) throws IOException {
-        if (value != null) {
-            cachedExtension.writeTo(value, output);
-        } else {
-            for (UnknownFieldData unknownField : unknownFieldData) {
-                unknownField.writeTo(output);
-            }
-        }
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (o == this) {
-            return true;
-        }
-        if (!(o instanceof FieldData)) {
-            return false;
-        }
-
-        FieldData other = (FieldData) o;
-        if (value != null && other.value != null) {
-            // If both objects have deserialized values, compare those.
-            // Since unknown fields are only compared if messages have generated equals methods
-            // we know this will be a meaningful comparison (not identity) for all values.
-            if (cachedExtension != other.cachedExtension) {  // Extension objects are singletons.
-                return false;
-            }
-            if (!cachedExtension.clazz.isArray()) {
-                // Can't test (!cachedExtension.repeated) due to 'bytes' -> 'byte[]'
-                return value.equals(other.value);
-            }
-            if (value instanceof byte[]) {
-                return Arrays.equals((byte[]) value, (byte[]) other.value);
-            } else if (value instanceof int[]) {
-                return Arrays.equals((int[]) value, (int[]) other.value);
-            } else if (value instanceof long[]) {
-                return Arrays.equals((long[]) value, (long[]) other.value);
-            } else if (value instanceof float[]) {
-                return Arrays.equals((float[]) value, (float[]) other.value);
-            } else if (value instanceof double[]) {
-                return Arrays.equals((double[]) value, (double[]) other.value);
-            } else if (value instanceof boolean[]) {
-                return Arrays.equals((boolean[]) value, (boolean[]) other.value);
-            } else {
-                return Arrays.deepEquals((Object[]) value, (Object[]) other.value);
-            }
-        }
-        if (unknownFieldData != null && other.unknownFieldData != null) {
-            // If both objects have byte arrays compare those directly.
-            return unknownFieldData.equals(other.unknownFieldData);
-        }
-        try {
-            // As a last resort, serialize and compare the resulting byte arrays.
-            return Arrays.equals(toByteArray(), other.toByteArray());
-        } catch (IOException e) {
-            // Should not happen.
-            throw new IllegalStateException(e);
-        }
-    }
-
-    @Override
-    public int hashCode() {
-        int result = 17;
-        try {
-            // The only way to generate a consistent hash is to use the serialized form.
-            result = 31 * result + Arrays.hashCode(toByteArray());
-        } catch (IOException e) {
-            // Should not happen.
-            throw new IllegalStateException(e);
-        }
-        return result;
-    }
-
-    private byte[] toByteArray() throws IOException {
-        byte[] result = new byte[computeSerializedSize()];
-        CodedOutputByteBufferNano output = CodedOutputByteBufferNano.newInstance(result);
-        writeTo(output);
-        return result;
-    }
-
-    @Override
-    public final FieldData clone() {
-        FieldData clone = new FieldData();
-        try {
-            clone.cachedExtension = cachedExtension;
-            if (unknownFieldData == null) {
-                clone.unknownFieldData = null;
-            } else {
-                clone.unknownFieldData.addAll(unknownFieldData);
-            }
-
-            // Whether we need to deep clone value depends on its type. Primitive reference types
-            // (e.g. Integer, Long etc.) are ok, since they're immutable. We need to clone arrays
-            // and messages.
-            if (value == null) {
-                // No cloning required.
-            } else if (value instanceof MessageNano) {
-                clone.value = ((MessageNano) value).clone();
-            } else if (value instanceof byte[]) {
-                clone.value = ((byte[]) value).clone();
-            } else if (value instanceof byte[][]) {
-                byte[][] valueArray = (byte[][]) value;
-                byte[][] cloneArray = new byte[valueArray.length][];
-                clone.value = cloneArray;
-                for (int i = 0; i < valueArray.length; i++) {
-                    cloneArray[i] = valueArray[i].clone();
-                }
-            } else if (value instanceof boolean[]) {
-                clone.value = ((boolean[]) value).clone();
-            } else if (value instanceof int[]) {
-                clone.value = ((int[]) value).clone();
-            } else if (value instanceof long[]) {
-                clone.value = ((long[]) value).clone();
-            } else if (value instanceof float[]) {
-                clone.value = ((float[]) value).clone();
-            } else if (value instanceof double[]) {
-                clone.value = ((double[]) value).clone();
-            } else if (value instanceof MessageNano[]) {
-                MessageNano[] valueArray = (MessageNano[]) value;
-                MessageNano[] cloneArray = new MessageNano[valueArray.length];
-                clone.value = cloneArray;
-                for (int i = 0; i < valueArray.length; i++) {
-                    cloneArray[i] = valueArray[i].clone();
-                }
-            }
-            return clone;
-        } catch (CloneNotSupportedException e) {
-            throw new AssertionError(e);
-        }
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java b/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java
deleted file mode 100644
index 278368a0..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/InternalNano.java
+++ /dev/null
@@ -1,547 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import com.google.protobuf.nano.MapFactories.MapFactory;
-
-import java.io.IOException;
-import java.nio.charset.Charset;
-import java.util.Arrays;
-import java.util.Map;
-import java.util.Map.Entry;
-
-/**
- * The classes contained within are used internally by the Protocol Buffer
- * library and generated message implementations. They are public only because
- * those generated messages do not reside in the {@code protobuf} package.
- * Others should not use this class directly.
- *
- * @author kenton@google.com (Kenton Varda)
- */
-public final class InternalNano {
-
-  public static final int TYPE_DOUBLE   = 1;
-  public static final int TYPE_FLOAT    = 2;
-  public static final int TYPE_INT64    = 3;
-  public static final int TYPE_UINT64   = 4;
-  public static final int TYPE_INT32    = 5;
-  public static final int TYPE_FIXED64  = 6;
-  public static final int TYPE_FIXED32  = 7;
-  public static final int TYPE_BOOL     = 8;
-  public static final int TYPE_STRING   = 9;
-  public static final int TYPE_GROUP    = 10;
-  public static final int TYPE_MESSAGE  = 11;
-  public static final int TYPE_BYTES    = 12;
-  public static final int TYPE_UINT32   = 13;
-  public static final int TYPE_ENUM     = 14;
-  public static final int TYPE_SFIXED32 = 15;
-  public static final int TYPE_SFIXED64 = 16;
-  public static final int TYPE_SINT32   = 17;
-  public static final int TYPE_SINT64   = 18;
-
-  static final Charset UTF_8 = Charset.forName("UTF-8");
-  static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
-
-  private InternalNano() {}
-
-  /**
-   * An object to provide synchronization when lazily initializing static fields
-   * of {@link MessageNano} subclasses.
-   * <p>
-   * To enable earlier versions of ProGuard to inline short methods from a
-   * generated MessageNano subclass to the call sites, that class must not have
-   * a class initializer, which will be created if there is any static variable
-   * initializers. To lazily initialize the static variables in a thread-safe
-   * manner, the initialization code will synchronize on this object.
-   */
-  public static final Object LAZY_INIT_LOCK = new Object();
-
-  /**
-   * Helper called by generated code to construct default values for string
-   * fields.
-   * <p>
-   * The protocol compiler does not actually contain a UTF-8 decoder -- it
-   * just pushes UTF-8-encoded text around without touching it.  The one place
-   * where this presents a problem is when generating Java string literals.
-   * Unicode characters in the string literal would normally need to be encoded
-   * using a Unicode escape sequence, which would require decoding them.
-   * To get around this, protoc instead embeds the UTF-8 bytes into the
-   * generated code and leaves it to the runtime library to decode them.
-   * <p>
-   * It gets worse, though.  If protoc just generated a byte array, like:
-   *   new byte[] {0x12, 0x34, 0x56, 0x78}
-   * Java actually generates *code* which allocates an array and then fills
-   * in each value.  This is much less efficient than just embedding the bytes
-   * directly into the bytecode.  To get around this, we need another
-   * work-around.  String literals are embedded directly, so protoc actually
-   * generates a string literal corresponding to the bytes.  The easiest way
-   * to do this is to use the ISO-8859-1 character set, which corresponds to
-   * the first 256 characters of the Unicode range.  Protoc can then use
-   * good old CEscape to generate the string.
-   * <p>
-   * So we have a string literal which represents a set of bytes which
-   * represents another string.  This function -- stringDefaultValue --
-   * converts from the generated string to the string we actually want.  The
-   * generated code calls this automatically.
-   */
-  public static String stringDefaultValue(String bytes) {
-    return new String(bytes.getBytes(ISO_8859_1), InternalNano.UTF_8);
-  }
-
-  /**
-   * Helper called by generated code to construct default values for bytes
-   * fields.
-   * <p>
-   * This is a lot like {@link #stringDefaultValue}, but for bytes fields.
-   * In this case we only need the second of the two hacks -- allowing us to
-   * embed raw bytes as a string literal with ISO-8859-1 encoding.
-   */
-  public static byte[] bytesDefaultValue(String bytes) {
-    return bytes.getBytes(ISO_8859_1);
-  }
-
-  /**
-   * Helper function to convert a string into UTF-8 while turning the
-   * UnsupportedEncodingException to a RuntimeException.
-   */
-  public static byte[] copyFromUtf8(final String text) {
-    return text.getBytes(InternalNano.UTF_8);
-  }
-
-  /**
-   * Checks repeated int field equality; null-value and 0-length fields are
-   * considered equal.
-   */
-  public static boolean equals(int[] field1, int[] field2) {
-    if (field1 == null || field1.length == 0) {
-      return field2 == null || field2.length == 0;
-    } else {
-      return Arrays.equals(field1, field2);
-    }
-  }
-
-  /**
-   * Checks repeated long field equality; null-value and 0-length fields are
-   * considered equal.
-   */
-  public static boolean equals(long[] field1, long[] field2) {
-    if (field1 == null || field1.length == 0) {
-      return field2 == null || field2.length == 0;
-    } else {
-      return Arrays.equals(field1, field2);
-    }
-  }
-
-  /**
-   * Checks repeated float field equality; null-value and 0-length fields are
-   * considered equal.
-   */
-  public static boolean equals(float[] field1, float[] field2) {
-    if (field1 == null || field1.length == 0) {
-      return field2 == null || field2.length == 0;
-    } else {
-      return Arrays.equals(field1, field2);
-    }
-  }
-
-  /**
-   * Checks repeated double field equality; null-value and 0-length fields are
-   * considered equal.
-   */
-  public static boolean equals(double[] field1, double[] field2) {
-    if (field1 == null || field1.length == 0) {
-      return field2 == null || field2.length == 0;
-    } else {
-      return Arrays.equals(field1, field2);
-    }
-  }
-
-  /**
-   * Checks repeated boolean field equality; null-value and 0-length fields are
-   * considered equal.
-   */
-  public static boolean equals(boolean[] field1, boolean[] field2) {
-    if (field1 == null || field1.length == 0) {
-      return field2 == null || field2.length == 0;
-    } else {
-      return Arrays.equals(field1, field2);
-    }
-  }
-
-  /**
-   * Checks repeated bytes field equality. Only non-null elements are tested.
-   * Returns true if the two fields have the same sequence of non-null
-   * elements. Null-value fields and fields of any length with only null
-   * elements are considered equal.
-   */
-  public static boolean equals(byte[][] field1, byte[][] field2) {
-    int index1 = 0;
-    int length1 = field1 == null ? 0 : field1.length;
-    int index2 = 0;
-    int length2 = field2 == null ? 0 : field2.length;
-    while (true) {
-      while (index1 < length1 && field1[index1] == null) {
-        index1++;
-      }
-      while (index2 < length2 && field2[index2] == null) {
-        index2++;
-      }
-      boolean atEndOf1 = index1 >= length1;
-      boolean atEndOf2 = index2 >= length2;
-      if (atEndOf1 && atEndOf2) {
-        // no more non-null elements to test in both arrays
-        return true;
-      } else if (atEndOf1 != atEndOf2) {
-        // one of the arrays have extra non-null elements
-        return false;
-      } else if (!Arrays.equals(field1[index1], field2[index2])) {
-        // element mismatch
-        return false;
-      }
-      index1++;
-      index2++;
-    }
-  }
-
-  /**
-   * Checks repeated string/message field equality. Only non-null elements are
-   * tested. Returns true if the two fields have the same sequence of non-null
-   * elements. Null-value fields and fields of any length with only null
-   * elements are considered equal.
-   */
-  public static boolean equals(Object[] field1, Object[] field2) {
-    int index1 = 0;
-    int length1 = field1 == null ? 0 : field1.length;
-    int index2 = 0;
-    int length2 = field2 == null ? 0 : field2.length;
-    while (true) {
-      while (index1 < length1 && field1[index1] == null) {
-        index1++;
-      }
-      while (index2 < length2 && field2[index2] == null) {
-        index2++;
-      }
-      boolean atEndOf1 = index1 >= length1;
-      boolean atEndOf2 = index2 >= length2;
-      if (atEndOf1 && atEndOf2) {
-        // no more non-null elements to test in both arrays
-        return true;
-      } else if (atEndOf1 != atEndOf2) {
-        // one of the arrays have extra non-null elements
-        return false;
-      } else if (!field1[index1].equals(field2[index2])) {
-        // element mismatch
-        return false;
-      }
-      index1++;
-      index2++;
-    }
-  }
-
-  /**
-   * Computes the hash code of a repeated int field. Null-value and 0-length
-   * fields have the same hash code.
-   */
-  public static int hashCode(int[] field) {
-    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
-  }
-
-  /**
-   * Computes the hash code of a repeated long field. Null-value and 0-length
-   * fields have the same hash code.
-   */
-  public static int hashCode(long[] field) {
-    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
-  }
-
-  /**
-   * Computes the hash code of a repeated float field. Null-value and 0-length
-   * fields have the same hash code.
-   */
-  public static int hashCode(float[] field) {
-    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
-  }
-
-  /**
-   * Computes the hash code of a repeated double field. Null-value and 0-length
-   * fields have the same hash code.
-   */
-  public static int hashCode(double[] field) {
-    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
-  }
-
-  /**
-   * Computes the hash code of a repeated boolean field. Null-value and 0-length
-   * fields have the same hash code.
-   */
-  public static int hashCode(boolean[] field) {
-    return field == null || field.length == 0 ? 0 : Arrays.hashCode(field);
-  }
-
-  /**
-   * Computes the hash code of a repeated bytes field. Only the sequence of all
-   * non-null elements are used in the computation. Null-value fields and fields
-   * of any length with only null elements have the same hash code.
-   */
-  public static int hashCode(byte[][] field) {
-    int result = 0;
-    for (int i = 0, size = field == null ? 0 : field.length; i < size; i++) {
-      byte[] element = field[i];
-      if (element != null) {
-        result = 31 * result + Arrays.hashCode(element);
-      }
-    }
-    return result;
-  }
-
-  /**
-   * Computes the hash code of a repeated string/message field. Only the
-   * sequence of all non-null elements are used in the computation. Null-value
-   * fields and fields of any length with only null elements have the same hash
-   * code.
-   */
-  public static int hashCode(Object[] field) {
-    int result = 0;
-    for (int i = 0, size = field == null ? 0 : field.length; i < size; i++) {
-      Object element = field[i];
-      if (element != null) {
-        result = 31 * result + element.hashCode();
-      }
-    }
-    return result;
-  }
-  private static Object primitiveDefaultValue(int type) {
-    switch (type) {
-      case TYPE_BOOL:
-        return Boolean.FALSE;
-      case TYPE_BYTES:
-        return WireFormatNano.EMPTY_BYTES;
-      case TYPE_STRING:
-        return "";
-      case TYPE_FLOAT:
-        return Float.valueOf(0);
-      case TYPE_DOUBLE:
-        return Double.valueOf(0);
-      case TYPE_ENUM:
-      case TYPE_FIXED32:
-      case TYPE_INT32:
-      case TYPE_UINT32:
-      case TYPE_SINT32:
-      case TYPE_SFIXED32:
-        return Integer.valueOf(0);
-      case TYPE_INT64:
-      case TYPE_UINT64:
-      case TYPE_SINT64:
-      case TYPE_FIXED64:
-      case TYPE_SFIXED64:
-        return Long.valueOf(0L);
-      case TYPE_MESSAGE:
-      case TYPE_GROUP:
-      default:
-        throw new IllegalArgumentException(
-            "Type: " + type + " is not a primitive type.");
-    }
-  }
-
-  /**
-   * Merges the map entry into the map field. Note this is only supposed to
-   * be called by generated messages.
-   *
-   * @param map the map field; may be null, in which case a map will be
-   *        instantiated using the {@link MapFactories.MapFactory}
-   * @param input the input byte buffer
-   * @param keyType key type, as defined in InternalNano.TYPE_*
-   * @param valueType value type, as defined in InternalNano.TYPE_*
-   * @param value an new instance of the value, if the value is a TYPE_MESSAGE;
-   *        otherwise this parameter can be null and will be ignored.
-   * @param keyTag wire tag for the key
-   * @param valueTag wire tag for the value
-   * @return the map field
-   * @throws IOException
-   */
-  @SuppressWarnings("unchecked")
-  public static final <K, V> Map<K, V> mergeMapEntry(
-      CodedInputByteBufferNano input,
-      Map<K, V> map,
-      MapFactory mapFactory,
-      int keyType,
-      int valueType,
-      V value,
-      int keyTag,
-      int valueTag) throws IOException {
-    map = mapFactory.forMap(map);
-    final int length = input.readRawVarint32();
-    final int oldLimit = input.pushLimit(length);
-    K key = null;
-    while (true) {
-      int tag = input.readTag();
-      if (tag == 0) {
-        break;
-      }
-      if (tag == keyTag) {
-        key = (K) input.readPrimitiveField(keyType);
-      } else if (tag == valueTag) {
-        if (valueType == TYPE_MESSAGE) {
-          input.readMessage((MessageNano) value);
-        } else {
-          value = (V) input.readPrimitiveField(valueType);
-        }
-      } else {
-        if (!input.skipField(tag)) {
-          break;
-        }
-      }
-    }
-    input.checkLastTagWas(0);
-    input.popLimit(oldLimit);
-
-    if (key == null) {
-      // key can only be primitive types.
-      key = (K) primitiveDefaultValue(keyType);
-    }
-
-    if (value == null) {
-      // message type value will be initialized by code-gen.
-      value = (V) primitiveDefaultValue(valueType);
-    }
-
-    map.put(key, value);
-    return map;
-  }
-
-  public static <K, V> void serializeMapField(
-      CodedOutputByteBufferNano output,
-      Map<K, V> map, int number, int keyType, int valueType)
-          throws IOException {
-    for (Entry<K, V> entry: map.entrySet()) {
-      K key = entry.getKey();
-      V value = entry.getValue();
-      if (key == null || value == null) {
-        throw new IllegalStateException(
-            "keys and values in maps cannot be null");
-      }
-      int entrySize =
-          CodedOutputByteBufferNano.computeFieldSize(1, keyType, key) +
-          CodedOutputByteBufferNano.computeFieldSize(2, valueType, value);
-      output.writeTag(number, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-      output.writeRawVarint32(entrySize);
-      output.writeField(1, keyType, key);
-      output.writeField(2, valueType, value);
-    }
-  }
-
-  public static <K, V> int computeMapFieldSize(
-      Map<K, V> map, int number, int keyType, int valueType) {
-    int size = 0;
-    int tagSize = CodedOutputByteBufferNano.computeTagSize(number);
-    for (Entry<K, V> entry: map.entrySet()) {
-      K key = entry.getKey();
-      V value = entry.getValue();
-      if (key == null || value == null) {
-        throw new IllegalStateException(
-            "keys and values in maps cannot be null");
-      }
-      int entrySize =
-          CodedOutputByteBufferNano.computeFieldSize(1, keyType, key) +
-          CodedOutputByteBufferNano.computeFieldSize(2, valueType, value);
-      size += tagSize + entrySize
-          + CodedOutputByteBufferNano.computeRawVarint32Size(entrySize);
-    }
-    return size;
-  }
-
-  /**
-   * Checks whether two {@link Map} are equal. We don't use the default equals
-   * method of {@link Map} because it compares by identity not by content for
-   * byte arrays.
-   */
-  public static <K, V> boolean equals(Map<K, V> a, Map<K, V> b) {
-    if (a == b) {
-      return true;
-    }
-    if (a == null) {
-      return b.size() == 0;
-    }
-    if (b == null) {
-      return a.size() == 0;
-    }
-    if (a.size() != b.size()) {
-      return false;
-    }
-    for (Entry<K, V> entry : a.entrySet()) {
-      if (!b.containsKey(entry.getKey())) {
-        return false;
-      }
-      if (!equalsMapValue(entry.getValue(), b.get(entry.getKey()))) {
-        return false;
-      }
-    }
-    return true;
-  }
-
-  private static boolean equalsMapValue(Object a, Object b) {
-    if (a == null || b == null) {
-      throw new IllegalStateException(
-          "keys and values in maps cannot be null");
-    }
-    if (a instanceof byte[] && b instanceof byte[]) {
-      return Arrays.equals((byte[]) a, (byte[]) b);
-    }
-    return a.equals(b);
-  }
-
-  public static <K, V> int hashCode(Map<K, V> map) {
-    if (map == null) {
-      return 0;
-    }
-    int result = 0;
-    for (Entry<K, V> entry : map.entrySet()) {
-      result += hashCodeForMap(entry.getKey())
-          ^ hashCodeForMap(entry.getValue());
-    }
-    return result;
-  }
-
-  private static int hashCodeForMap(Object o) {
-    if (o instanceof byte[]) {
-      return Arrays.hashCode((byte[]) o);
-    }
-    return o.hashCode();
-  }
-
-  // This avoids having to make FieldArray public.
-  public static void cloneUnknownFieldData(ExtendableMessageNano original,
-      ExtendableMessageNano cloned) {
-    if (original.unknownFieldData != null) {
-      cloned.unknownFieldData = (FieldArray) original.unknownFieldData.clone();
-    }
-  }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java b/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java
deleted file mode 100644
index 9a83d6d3..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java
+++ /dev/null
@@ -1,93 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-
-/**
- * Thrown when a protocol message being parsed is invalid in some way,
- * e.g. it contains a malformed varint or a negative byte length.
- *
- * @author kenton@google.com Kenton Varda
- */
-public class InvalidProtocolBufferNanoException extends IOException {
-  private static final long serialVersionUID = -1616151763072450476L;
-
-  public InvalidProtocolBufferNanoException(final String description) {
-    super(description);
-  }
-
-  static InvalidProtocolBufferNanoException truncatedMessage() {
-    return new InvalidProtocolBufferNanoException(
-      "While parsing a protocol message, the input ended unexpectedly " +
-      "in the middle of a field.  This could mean either that the " +
-      "input has been truncated or that an embedded message " +
-      "misreported its own length.");
-  }
-
-  static InvalidProtocolBufferNanoException negativeSize() {
-    return new InvalidProtocolBufferNanoException(
-      "CodedInputStream encountered an embedded string or message " +
-      "which claimed to have negative size.");
-  }
-
-  static InvalidProtocolBufferNanoException malformedVarint() {
-    return new InvalidProtocolBufferNanoException(
-      "CodedInputStream encountered a malformed varint.");
-  }
-
-  static InvalidProtocolBufferNanoException invalidTag() {
-    return new InvalidProtocolBufferNanoException(
-      "Protocol message contained an invalid tag (zero).");
-  }
-
-  static InvalidProtocolBufferNanoException invalidEndTag() {
-    return new InvalidProtocolBufferNanoException(
-      "Protocol message end-group tag did not match expected tag.");
-  }
-
-  static InvalidProtocolBufferNanoException invalidWireType() {
-    return new InvalidProtocolBufferNanoException(
-      "Protocol message tag had invalid wire type.");
-  }
-
-  static InvalidProtocolBufferNanoException recursionLimitExceeded() {
-    return new InvalidProtocolBufferNanoException(
-      "Protocol message had too many levels of nesting.  May be malicious.  " +
-      "Use CodedInputStream.setRecursionLimit() to increase the depth limit.");
-  }
-
-  static InvalidProtocolBufferNanoException sizeLimitExceeded() {
-    return new InvalidProtocolBufferNanoException(
-      "Protocol message was too large.  May be malicious.  " +
-      "Use CodedInputStream.setSizeLimit() to increase the size limit.");
-  }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/MessageNano.java b/javanano/src/main/java/com/google/protobuf/nano/MessageNano.java
deleted file mode 100644
index 23475027..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/MessageNano.java
+++ /dev/null
@@ -1,198 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-import java.util.Arrays;
-
-/**
- * Abstract interface implemented by Protocol Message objects.
- *
- * @author wink@google.com Wink Saville
- */
-public abstract class MessageNano {
-    protected volatile int cachedSize = -1;
-
-    /**
-     * Get the number of bytes required to encode this message.
-     * Returns the cached size or calls getSerializedSize which
-     * sets the cached size. This is used internally when serializing
-     * so the size is only computed once. If a member is modified
-     * then this could be stale call getSerializedSize if in doubt.
-     */
-    public int getCachedSize() {
-        if (cachedSize < 0) {
-            // getSerializedSize sets cachedSize
-            getSerializedSize();
-        }
-        return cachedSize;
-    }
-
-    /**
-     * Computes the number of bytes required to encode this message.
-     * The size is cached and the cached result can be retrieved
-     * using getCachedSize().
-     */
-    public int getSerializedSize() {
-        int size = computeSerializedSize();
-        cachedSize = size;
-        return size;
-    }
-
-    /**
-     * Computes the number of bytes required to encode this message. This does not update the
-     * cached size.
-     */
-    protected int computeSerializedSize() {
-      // This is overridden if the generated message has serialized fields.
-      return 0;
-    }
-
-    /**
-     * Serializes the message and writes it to {@code output}.
-     *
-     * @param output the output to receive the serialized form.
-     * @throws IOException if an error occurred writing to {@code output}.
-     */
-    public void writeTo(CodedOutputByteBufferNano output) throws IOException {
-        // Does nothing by default. Overridden by subclasses which have data to write.
-    }
-
-    /**
-     * Parse {@code input} as a message of this type and merge it with the
-     * message being built.
-     */
-    public abstract MessageNano mergeFrom(CodedInputByteBufferNano input) throws IOException;
-
-    /**
-     * Serialize to a byte array.
-     * @return byte array with the serialized data.
-     */
-    public static final byte[] toByteArray(MessageNano msg) {
-        final byte[] result = new byte[msg.getSerializedSize()];
-        toByteArray(msg, result, 0, result.length);
-        return result;
-    }
-
-    /**
-     * Serialize to a byte array starting at offset through length. The
-     * method getSerializedSize must have been called prior to calling
-     * this method so the proper length is know.  If an attempt to
-     * write more than length bytes OutOfSpaceException will be thrown
-     * and if length bytes are not written then IllegalStateException
-     * is thrown.
-     */
-    public static final void toByteArray(MessageNano msg, byte[] data, int offset, int length) {
-        try {
-            final CodedOutputByteBufferNano output =
-                CodedOutputByteBufferNano.newInstance(data, offset, length);
-            msg.writeTo(output);
-            output.checkNoSpaceLeft();
-        } catch (IOException e) {
-            throw new RuntimeException("Serializing to a byte array threw an IOException "
-                    + "(should never happen).", e);
-        }
-    }
-
-    /**
-     * Parse {@code data} as a message of this type and merge it with the
-     * message being built.
-     */
-    public static final <T extends MessageNano> T mergeFrom(T msg, final byte[] data)
-        throws InvalidProtocolBufferNanoException {
-        return mergeFrom(msg, data, 0, data.length);
-    }
-
-    /**
-     * Parse {@code data} as a message of this type and merge it with the
-     * message being built.
-     */
-    public static final <T extends MessageNano> T mergeFrom(T msg, final byte[] data,
-            final int off, final int len) throws InvalidProtocolBufferNanoException {
-        try {
-            final CodedInputByteBufferNano input =
-                CodedInputByteBufferNano.newInstance(data, off, len);
-            msg.mergeFrom(input);
-            input.checkLastTagWas(0);
-            return msg;
-        } catch (InvalidProtocolBufferNanoException e) {
-            throw e;
-        } catch (IOException e) {
-            throw new RuntimeException("Reading from a byte array threw an IOException (should "
-                    + "never happen).");
-        }
-    }
-
-    /**
-     * Compares two {@code MessageNano}s and returns true if the message's are the same class and
-     * have serialized form equality (i.e. all of the field values are the same).
-     */
-    public static final boolean messageNanoEquals(MessageNano a, MessageNano b) {
-        if (a == b) {
-            return true;
-        }
-        if (a == null || b == null) {
-            return false;
-        }
-        if (a.getClass() != b.getClass()) {
-          return false;
-        }
-        final int serializedSize = a.getSerializedSize();
-        if (b.getSerializedSize() != serializedSize) {
-            return false;
-        }
-        final byte[] aByteArray = new byte[serializedSize];
-        final byte[] bByteArray = new byte[serializedSize];
-        toByteArray(a, aByteArray, 0, serializedSize);
-        toByteArray(b, bByteArray, 0, serializedSize);
-        return Arrays.equals(aByteArray, bByteArray);
-    }
-
-    /**
-     * Returns a string that is (mostly) compatible with ProtoBuffer's TextFormat. Note that groups
-     * (which are deprecated) are not serialized with the correct field name.
-     *
-     * <p>This is implemented using reflection, so it is not especially fast nor is it guaranteed
-     * to find all fields if you have method removal turned on for proguard.
-     */
-    @Override
-    public String toString() {
-        return MessageNanoPrinter.print(this);
-    }
-
-    /**
-     * Provides support for cloning. This only works if you specify the generate_clone method.
-     */
-    @Override
-    public MessageNano clone() throws CloneNotSupportedException {
-        return (MessageNano) super.clone();
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java b/javanano/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java
deleted file mode 100644
index 5f329f02..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/MessageNanoPrinter.java
+++ /dev/null
@@ -1,275 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.lang.reflect.Array;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
-import java.util.Map;
-
-/**
- * Static helper methods for printing nano protos.
- *
- * @author flynn@google.com Andrew Flynn
- */
-public final class MessageNanoPrinter {
-    // Do not allow instantiation
-    private MessageNanoPrinter() {}
-
-    private static final String INDENT = "  ";
-    private static final int MAX_STRING_LEN = 200;
-
-    /**
-     * Returns an text representation of a MessageNano suitable for debugging. The returned string
-     * is mostly compatible with Protocol Buffer's TextFormat (as provided by non-nano protocol
-     * buffers) -- groups (which are deprecated) are output with an underscore name (e.g. foo_bar
-     * instead of FooBar) and will thus not parse.
-     *
-     * <p>Employs Java reflection on the given object and recursively prints primitive fields,
-     * groups, and messages.</p>
-     */
-    public static <T extends MessageNano> String print(T message) {
-        if (message == null) {
-            return "";
-        }
-
-        StringBuffer buf = new StringBuffer();
-        try {
-            print(null, message, new StringBuffer(), buf);
-        } catch (IllegalAccessException e) {
-            return "Error printing proto: " + e.getMessage();
-        } catch (InvocationTargetException e) {
-            return "Error printing proto: " + e.getMessage();
-        }
-        return buf.toString();
-    }
-
-    /**
-     * Function that will print the given message/field into the StringBuffer.
-     * Meant to be called recursively.
-     *
-     * @param identifier the identifier to use, or {@code null} if this is the root message to
-     *        print.
-     * @param object the value to print. May in fact be a primitive value or byte array and not a
-     *        message.
-     * @param indentBuf the indentation each line should begin with.
-     * @param buf the output buffer.
-     */
-    private static void print(String identifier, Object object,
-            StringBuffer indentBuf, StringBuffer buf) throws IllegalAccessException,
-            InvocationTargetException {
-        if (object == null) {
-            // This can happen if...
-            //   - we're about to print a message, String, or byte[], but it not present;
-            //   - we're about to print a primitive, but "reftype" optional style is enabled, and
-            //     the field is unset.
-            // In both cases the appropriate behavior is to output nothing.
-        } else if (object instanceof MessageNano) {  // Nano proto message
-            int origIndentBufLength = indentBuf.length();
-            if (identifier != null) {
-                buf.append(indentBuf).append(deCamelCaseify(identifier)).append(" <\n");
-                indentBuf.append(INDENT);
-            }
-            Class<?> clazz = object.getClass();
-
-            // Proto fields follow one of two formats:
-            //
-            // 1) Public, non-static variables that do not begin or end with '_'
-            // Find and print these using declared public fields
-            for (Field field : clazz.getFields()) {
-                int modifiers = field.getModifiers();
-                String fieldName = field.getName();
-                if ("cachedSize".equals(fieldName)) {
-                    // TODO(bduff): perhaps cachedSize should have a more obscure name.
-                    continue;
-                }
-
-                if ((modifiers & Modifier.PUBLIC) == Modifier.PUBLIC
-                        && (modifiers & Modifier.STATIC) != Modifier.STATIC
-                        && !fieldName.startsWith("_")
-                        && !fieldName.endsWith("_")) {
-                    Class<?> fieldType = field.getType();
-                    Object value = field.get(object);
-
-                    if (fieldType.isArray()) {
-                        Class<?> arrayType = fieldType.getComponentType();
-
-                        // bytes is special since it's not repeated, but is represented by an array
-                        if (arrayType == byte.class) {
-                            print(fieldName, value, indentBuf, buf);
-                        } else {
-                            int len = value == null ? 0 : Array.getLength(value);
-                            for (int i = 0; i < len; i++) {
-                                Object elem = Array.get(value, i);
-                                print(fieldName, elem, indentBuf, buf);
-                            }
-                        }
-                    } else {
-                        print(fieldName, value, indentBuf, buf);
-                    }
-                }
-            }
-
-            // 2) Fields that are accessed via getter methods (when accessors
-            //    mode is turned on)
-            // Find and print these using getter methods.
-            for (Method method : clazz.getMethods()) {
-                String name = method.getName();
-                // Check for the setter accessor method since getters and hazzers both have
-                // non-proto-field name collisions (hashCode() and getSerializedSize())
-                if (name.startsWith("set")) {
-                    String subfieldName = name.substring(3);
-
-                    Method hazzer = null;
-                    try {
-                        hazzer = clazz.getMethod("has" + subfieldName);
-                    } catch (NoSuchMethodException e) {
-                        continue;
-                    }
-                    // If hazzer doesn't exist or returns false, no need to continue
-                    if (!(Boolean) hazzer.invoke(object)) {
-                        continue;
-                    }
-
-                    Method getter = null;
-                    try {
-                        getter = clazz.getMethod("get" + subfieldName);
-                    } catch (NoSuchMethodException e) {
-                        continue;
-                    }
-
-                    print(subfieldName, getter.invoke(object), indentBuf, buf);
-                }
-            }
-            if (identifier != null) {
-                indentBuf.setLength(origIndentBufLength);
-                buf.append(indentBuf).append(">\n");
-            }
-        } else if (object instanceof Map) {
-          Map<?,?> map = (Map<?,?>) object;
-          identifier = deCamelCaseify(identifier);
-
-          for (Map.Entry<?,?> entry : map.entrySet()) {
-            buf.append(indentBuf).append(identifier).append(" <\n");
-            int origIndentBufLength = indentBuf.length();
-            indentBuf.append(INDENT);
-            print("key", entry.getKey(), indentBuf, buf);
-            print("value", entry.getValue(), indentBuf, buf);
-            indentBuf.setLength(origIndentBufLength);
-            buf.append(indentBuf).append(">\n");
-          }
-        } else {
-            // Non-null primitive value
-            identifier = deCamelCaseify(identifier);
-            buf.append(indentBuf).append(identifier).append(": ");
-            if (object instanceof String) {
-                String stringMessage = sanitizeString((String) object);
-                buf.append("\"").append(stringMessage).append("\"");
-            } else if (object instanceof byte[]) {
-                appendQuotedBytes((byte[]) object, buf);
-            } else {
-                buf.append(object);
-            }
-            buf.append("\n");
-        }
-    }
-
-    /**
-     * Converts an identifier of the format "FieldName" into "field_name".
-     */
-    private static String deCamelCaseify(String identifier) {
-        StringBuffer out = new StringBuffer();
-        for (int i = 0; i < identifier.length(); i++) {
-            char currentChar = identifier.charAt(i);
-            if (i == 0) {
-                out.append(Character.toLowerCase(currentChar));
-            } else if (Character.isUpperCase(currentChar)) {
-                out.append('_').append(Character.toLowerCase(currentChar));
-            } else {
-                out.append(currentChar);
-            }
-        }
-        return out.toString();
-    }
-
-    /**
-     * Shortens and escapes the given string.
-     */
-    private static String sanitizeString(String str) {
-        if (!str.startsWith("http") && str.length() > MAX_STRING_LEN) {
-            // Trim non-URL strings.
-            str = str.substring(0, MAX_STRING_LEN) + "[...]";
-        }
-        return escapeString(str);
-    }
-
-    /**
-     * Escape everything except for low ASCII code points.
-     */
-    private static String escapeString(String str) {
-        int strLen = str.length();
-        StringBuilder b = new StringBuilder(strLen);
-        for (int i = 0; i < strLen; i++) {
-            char original = str.charAt(i);
-            if (original >= ' ' && original <= '~' && original != '"' && original != '\'') {
-                b.append(original);
-            } else {
-                b.append(String.format("\\u%04x", (int) original));
-            }
-        }
-        return b.toString();
-    }
-
-    /**
-     * Appends a quoted byte array to the provided {@code StringBuffer}.
-     */
-    private static void appendQuotedBytes(byte[] bytes, StringBuffer builder) {
-        if (bytes == null) {
-            builder.append("\"\"");
-            return;
-        }
-
-        builder.append('"');
-        for (int i = 0; i < bytes.length; ++i) {
-            int ch = bytes[i] & 0xff;
-            if (ch == '\\' || ch == '"') {
-                builder.append('\\').append((char) ch);
-            } else if (ch >= 32 && ch < 127) {
-                builder.append((char) ch);
-            } else {
-                builder.append(String.format("\\%03o", ch));
-            }
-        }
-        builder.append('"');
-    }
-}
diff --git a/javanano/src/main/java/com/google/protobuf/nano/WireFormatNano.java b/javanano/src/main/java/com/google/protobuf/nano/WireFormatNano.java
deleted file mode 100644
index bbb6370a..00000000
--- a/javanano/src/main/java/com/google/protobuf/nano/WireFormatNano.java
+++ /dev/null
@@ -1,124 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import java.io.IOException;
-
-/**
- * This class is used internally by the Protocol Buffer library and generated
- * message implementations.  It is public only because those generated messages
- * do not reside in the {@code protobuf} package.  Others should not use this
- * class directly.
- *
- * This class contains constants and helper functions useful for dealing with
- * the Protocol Buffer wire format.
- *
- * @author kenton@google.com Kenton Varda
- */
-public final class WireFormatNano {
-  // Do not allow instantiation.
-  private WireFormatNano() {}
-
-  static final int WIRETYPE_VARINT           = 0;
-  static final int WIRETYPE_FIXED64          = 1;
-  static final int WIRETYPE_LENGTH_DELIMITED = 2;
-  static final int WIRETYPE_START_GROUP      = 3;
-  static final int WIRETYPE_END_GROUP        = 4;
-  static final int WIRETYPE_FIXED32          = 5;
-
-  static final int TAG_TYPE_BITS = 3;
-  static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1;
-
-  /** Given a tag value, determines the wire type (the lower 3 bits). */
-  static int getTagWireType(final int tag) {
-    return tag & TAG_TYPE_MASK;
-  }
-
-  /** Given a tag value, determines the field number (the upper 29 bits). */
-  public static int getTagFieldNumber(final int tag) {
-    return tag >>> TAG_TYPE_BITS;
-  }
-
-  /** Makes a tag value given a field number and wire type. */
-  static int makeTag(final int fieldNumber, final int wireType) {
-    return (fieldNumber << TAG_TYPE_BITS) | wireType;
-  }
-
-  public static final int EMPTY_INT_ARRAY[] = {};
-  public static final long EMPTY_LONG_ARRAY[] = {};
-  public static final float EMPTY_FLOAT_ARRAY[] = {};
-  public static final double EMPTY_DOUBLE_ARRAY[] = {};
-  public static final boolean EMPTY_BOOLEAN_ARRAY[] = {};
-  public static final String EMPTY_STRING_ARRAY[] = {};
-  public static final byte[] EMPTY_BYTES_ARRAY[] = {};
-  public static final byte[] EMPTY_BYTES = {};
-
-  /**
-   * Parses an unknown field. This implementation skips the field.
-   *
-   * <p>Generated messages will call this for unknown fields if the store_unknown_fields
-   * option is off.
-   *
-   * @return {@literal true} unless the tag is an end-group tag.
-   */
-  public static boolean parseUnknownField(
-      final CodedInputByteBufferNano input,
-      final int tag) throws IOException {
-    return input.skipField(tag);
-  }
-
-  /**
-   * Computes the array length of a repeated field. We assume that in the common case repeated
-   * fields are contiguously serialized but we still correctly handle interspersed values of a
-   * repeated field (but with extra allocations).
-   *
-   * Rewinds to current input position before returning.
-   *
-   * @param input stream input, pointing to the byte after the first tag
-   * @param tag repeated field tag just read
-   * @return length of array
-   * @throws IOException
-   */
-  public static final int getRepeatedFieldArrayLength(
-      final CodedInputByteBufferNano input,
-      final int tag) throws IOException {
-    int arrayLength = 1;
-    int startPos = input.getPosition();
-    input.skipField(tag);
-    while (input.readTag() == tag) {
-      input.skipField(tag);
-      arrayLength++;
-    }
-    input.rewindToPosition(startPos);
-    return arrayLength;
-  }
-
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/NanoTest.java b/javanano/src/test/java/com/google/protobuf/nano/NanoTest.java
deleted file mode 100644
index 4d6e7f09..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/NanoTest.java
+++ /dev/null
@@ -1,4471 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf.nano;
-
-import com.google.protobuf.nano.CodedOutputByteBufferNano;
-import com.google.protobuf.nano.EnumClassNanos.EnumClassNano;
-import com.google.protobuf.nano.EnumClassNanos.EnumClassNano.MessageScopeEnum;
-import com.google.protobuf.nano.EnumClassNanos.FileScopeEnum;
-import com.google.protobuf.nano.MapTestProto.TestMap;
-import com.google.protobuf.nano.MapTestProto.TestMap.MessageValue;
-import com.google.protobuf.nano.NanoAccessorsOuterClass.TestNanoAccessors;
-import com.google.protobuf.nano.NanoHasOuterClass.TestAllTypesNanoHas;
-import com.google.protobuf.nano.NanoOuterClass.TestAllTypesNano;
-import com.google.protobuf.nano.UnittestRecursiveNano.RecursiveMessageNano;
-import com.google.protobuf.nano.NanoReferenceTypesCompat;
-import com.google.protobuf.nano.UnittestSimpleNano.SimpleMessageNano;
-import com.google.protobuf.nano.UnittestSingleNano.SingleMessageNano;
-import com.google.protobuf.nano.testext.nano.Extensions;
-import com.google.protobuf.nano.testext.nano.Extensions.AnotherMessage;
-import com.google.protobuf.nano.testext.nano.Extensions.MessageWithGroup;
-import com.google.protobuf.nano.testimport.nano.UnittestImportNano;
-
-import junit.framework.TestCase;
-
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.TreeMap;
-
-/**
- * Test nano runtime.
- *
- * @author ulas@google.com Ulas Kirazci
- */
-public class NanoTest extends TestCase {
-  @Override
-  public void setUp() throws Exception {
-  }
-
-  public void testSimpleMessageNano() throws Exception {
-    SimpleMessageNano msg = new SimpleMessageNano();
-    assertEquals(123, msg.d);
-    assertEquals(null, msg.nestedMsg);
-    assertEquals(SimpleMessageNano.BAZ, msg.defaultNestedEnum);
-
-    msg.d = 456;
-    assertEquals(456, msg.d);
-
-    SimpleMessageNano.NestedMessage nestedMsg = new SimpleMessageNano.NestedMessage();
-    nestedMsg.bb = 2;
-    assertEquals(2, nestedMsg.bb);
-    msg.nestedMsg = nestedMsg;
-    assertEquals(2, msg.nestedMsg.bb);
-
-    msg.defaultNestedEnum = SimpleMessageNano.BAR;
-    assertEquals(SimpleMessageNano.BAR, msg.defaultNestedEnum);
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    SimpleMessageNano newMsg = SimpleMessageNano.parseFrom(result);
-    assertEquals(456, newMsg.d);
-    assertEquals(2, msg.nestedMsg.bb);
-    assertEquals(SimpleMessageNano.BAR, msg.defaultNestedEnum);
-
-    msg.nestedMsg = null;
-    assertTrue(msgSerializedSize != msg.getSerializedSize());
-
-    msg.clear();
-    assertEquals(0, msg.getSerializedSize());
-  }
-
-  public void testRecursiveMessageNano() throws Exception {
-    RecursiveMessageNano msg = new RecursiveMessageNano();
-    assertTrue(msg.repeatedRecursiveMessageNano.length == 0);
-
-    RecursiveMessageNano msg1 = new RecursiveMessageNano();
-    msg1.id = 1;
-    assertEquals(1, msg1.id);
-    RecursiveMessageNano msg2 = new RecursiveMessageNano();
-    msg2.id = 2;
-    RecursiveMessageNano msg3 = new RecursiveMessageNano();
-    msg3.id = 3;
-
-    RecursiveMessageNano.NestedMessage nestedMsg = new RecursiveMessageNano.NestedMessage();
-    nestedMsg.a = msg1;
-    assertEquals(1, nestedMsg.a.id);
-
-    msg.id = 0;
-    msg.nestedMessage = nestedMsg;
-    msg.optionalRecursiveMessageNano = msg2;
-    msg.repeatedRecursiveMessageNano = new RecursiveMessageNano[] { msg3 };
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 16);
-    assertEquals(result.length, msgSerializedSize);
-
-    RecursiveMessageNano newMsg = RecursiveMessageNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedRecursiveMessageNano.length);
-
-    assertEquals(0, newMsg.id);
-    assertEquals(1, newMsg.nestedMessage.a.id);
-    assertEquals(2, newMsg.optionalRecursiveMessageNano.id);
-    assertEquals(3, newMsg.repeatedRecursiveMessageNano[0].id);
-  }
-
-  public void testMessageNoFields() {
-    SingleMessageNano msg = new SingleMessageNano();
-    assertEquals(0, msg.getSerializedSize());
-    assertEquals(0, MessageNano.toByteArray(msg).length);
-  }
-
-  public void testNanoRequiredInt32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.id = 123;
-    assertEquals(123, msg.id);
-    msg.clear().id = 456;
-    assertEquals(456, msg.id);
-    msg.clear();
-
-    msg.id = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 3);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.id);
-  }
-
-  public void testNanoOptionalInt32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalInt32 = 123;
-    assertEquals(123, msg.optionalInt32);
-    msg.clear()
-       .optionalInt32 = 456;
-    assertEquals(456, msg.optionalInt32);
-    msg.clear();
-
-    msg.optionalInt32 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 5);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalInt32);
-  }
-
-  public void testNanoOptionalInt64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalInt64 = 123;
-    assertEquals(123, msg.optionalInt64);
-    msg.clear()
-       .optionalInt64 = 456;
-    assertEquals(456, msg.optionalInt64);
-    msg.clear();
-    assertEquals(0, msg.optionalInt64);
-
-    msg.optionalInt64 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 5);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalInt64);
-  }
-
-  public void testNanoOptionalUint32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalUint32 = 123;
-    assertEquals(123, msg.optionalUint32);
-    msg.clear()
-       .optionalUint32 = 456;
-    assertEquals(456, msg.optionalUint32);
-    msg.clear();
-    assertEquals(0, msg.optionalUint32);
-
-    msg.optionalUint32 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 5);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalUint32);
-  }
-
-  public void testNanoOptionalUint64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalUint64 = 123;
-    assertEquals(123, msg.optionalUint64);
-    msg.clear()
-       .optionalUint64 = 456;
-    assertEquals(456, msg.optionalUint64);
-    msg.clear();
-    assertEquals(0, msg.optionalUint64);
-
-    msg.optionalUint64 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 5);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalUint64);
-  }
-
-  public void testNanoOptionalSint32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalSint32 = 123;
-    assertEquals(123, msg.optionalSint32);
-    msg.clear()
-       .optionalSint32 = 456;
-    assertEquals(456, msg.optionalSint32);
-    msg.clear();
-    assertEquals(0, msg.optionalSint32);
-
-    msg.optionalSint32 = -123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(-123, newMsg.optionalSint32);
-  }
-
-  public void testNanoOptionalSint64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalSint64 = 123;
-    assertEquals(123, msg.optionalSint64);
-    msg.clear()
-       .optionalSint64 = 456;
-    assertEquals(456, msg.optionalSint64);
-    msg.clear();
-    assertEquals(0, msg.optionalSint64);
-
-    msg.optionalSint64 = -123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(-123, newMsg.optionalSint64);
-  }
-
-  public void testNanoOptionalFixed32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalFixed32 = 123;
-    assertEquals(123, msg.optionalFixed32);
-    msg.clear()
-       .optionalFixed32 = 456;
-    assertEquals(456, msg.optionalFixed32);
-    msg.clear();
-    assertEquals(0, msg.optionalFixed32);
-
-    msg.optionalFixed32 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalFixed32);
-  }
-
-  public void testNanoOptionalFixed64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalFixed64 = 123;
-    assertEquals(123, msg.optionalFixed64);
-    msg.clear()
-       .optionalFixed64 = 456;
-    assertEquals(456, msg.optionalFixed64);
-    msg.clear();
-    assertEquals(0, msg.optionalFixed64);
-
-    msg.optionalFixed64 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 12);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalFixed64);
-  }
-
-  public void testNanoOptionalSfixed32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalSfixed32 = 123;
-    assertEquals(123, msg.optionalSfixed32);
-    msg.clear()
-       .optionalSfixed32 = 456;
-    assertEquals(456, msg.optionalSfixed32);
-    msg.clear();
-    assertEquals(0, msg.optionalSfixed32);
-
-    msg.optionalSfixed32 = 123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(123, newMsg.optionalSfixed32);
-  }
-
-  public void testNanoOptionalSfixed64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalSfixed64 = 123;
-    assertEquals(123, msg.optionalSfixed64);
-    msg.clear()
-       .optionalSfixed64 = 456;
-    assertEquals(456, msg.optionalSfixed64);
-    msg.clear();
-    assertEquals(0, msg.optionalSfixed64);
-
-    msg.optionalSfixed64 = -123;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 12);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(-123, newMsg.optionalSfixed64);
-  }
-
-  public void testNanoOptionalFloat() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalFloat = 123f;
-    assertTrue(123.0f == msg.optionalFloat);
-    msg.clear()
-       .optionalFloat = 456.0f;
-    assertTrue(456.0f == msg.optionalFloat);
-    msg.clear();
-    assertTrue(0.0f == msg.optionalFloat);
-
-    msg.optionalFloat = -123.456f;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(-123.456f == newMsg.optionalFloat);
-  }
-
-  public void testNanoOptionalDouble() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalDouble = 123;
-    assertTrue(123.0 == msg.optionalDouble);
-    msg.clear()
-       .optionalDouble = 456.0;
-    assertTrue(456.0 == msg.optionalDouble);
-    msg.clear();
-    assertTrue(0.0 == msg.optionalDouble);
-
-    msg.optionalDouble = -123.456;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 12);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(-123.456 == newMsg.optionalDouble);
-  }
-
-  public void testNanoOptionalBool() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalBool = true;
-    assertTrue(msg.optionalBool);
-    msg.clear()
-       .optionalBool = true;
-    assertTrue(msg.optionalBool);
-    msg.clear();
-    assertFalse(msg.optionalBool);
-
-    msg.optionalBool = true;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 5);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalBool);
-  }
-
-  public void testNanoOptionalString() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalString = "hello";
-    assertEquals("hello", msg.optionalString);
-    msg.clear();
-    assertTrue(msg.optionalString.isEmpty());
-    msg.clear()
-       .optionalString = "hello2";
-    assertEquals("hello2", msg.optionalString);
-    msg.clear();
-    assertTrue(msg.optionalString.isEmpty());
-
-    msg.optionalString = "bye";
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalString != null);
-    assertEquals("bye", newMsg.optionalString);
-  }
-
-  public void testNanoOptionalBytes() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertFalse(msg.optionalBytes.length > 0);
-    msg.optionalBytes = InternalNano.copyFromUtf8("hello");
-    assertTrue(msg.optionalBytes.length > 0);
-    assertEquals("hello", new String(msg.optionalBytes, InternalNano.UTF_8));
-    msg.clear();
-    assertFalse(msg.optionalBytes.length > 0);
-    msg.clear()
-       .optionalBytes = InternalNano.copyFromUtf8("hello");
-    assertTrue(msg.optionalBytes.length > 0);
-    msg.clear();
-    assertFalse(msg.optionalBytes.length > 0);
-
-    msg.optionalBytes = InternalNano.copyFromUtf8("bye");
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalBytes.length > 0);
-    assertEquals("bye", new String(newMsg.optionalBytes, InternalNano.UTF_8));
-  }
-
-  public void testNanoOptionalGroup() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    TestAllTypesNano.OptionalGroup grp = new TestAllTypesNano.OptionalGroup();
-    grp.a = 1;
-    assertFalse(msg.optionalGroup != null);
-    msg.optionalGroup = grp;
-    assertTrue(msg.optionalGroup != null);
-    assertEquals(1, msg.optionalGroup.a);
-    msg.clear();
-    assertFalse(msg.optionalGroup != null);
-    msg.clear()
-       .optionalGroup = new TestAllTypesNano.OptionalGroup();
-    msg.optionalGroup.a = 2;
-    assertTrue(msg.optionalGroup != null);
-    msg.clear();
-    assertFalse(msg.optionalGroup != null);
-
-    msg.optionalGroup = grp;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalGroup != null);
-    assertEquals(1, newMsg.optionalGroup.a);
-  }
-
-  public void testNanoOptionalGroupWithUnknownFieldsEnabled() throws Exception {
-    MessageWithGroup msg = new MessageWithGroup();
-    MessageWithGroup.Group grp = new MessageWithGroup.Group();
-    grp.a = 1;
-    msg.group = grp;
-    byte [] serialized = MessageNano.toByteArray(msg);
-
-    MessageWithGroup parsed = MessageWithGroup.parseFrom(serialized);
-    assertEquals(1, parsed.group.a);
-
-    byte [] serialized2 = MessageNano.toByteArray(parsed);
-    assertEquals(serialized.length, serialized2.length);
-    MessageWithGroup parsed2 = MessageWithGroup.parseFrom(serialized2);
-    assertEquals(1, parsed2.group.a);
-  }
-
-  public void testNanoOptionalNestedMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    TestAllTypesNano.NestedMessage nestedMsg = new TestAllTypesNano.NestedMessage();
-    nestedMsg.bb = 1;
-    assertFalse(msg.optionalNestedMessage != null);
-    msg.optionalNestedMessage = nestedMsg;
-    assertTrue(msg.optionalNestedMessage != null);
-    assertEquals(1, msg.optionalNestedMessage.bb);
-    msg.clear();
-    assertFalse(msg.optionalNestedMessage != null);
-    msg.clear()
-       .optionalNestedMessage = new TestAllTypesNano.NestedMessage();
-    msg.optionalNestedMessage.bb = 2;
-    assertTrue(msg.optionalNestedMessage != null);
-    msg.clear();
-    assertFalse(msg.optionalNestedMessage != null);
-
-    msg.optionalNestedMessage = nestedMsg;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalNestedMessage != null);
-    assertEquals(1, newMsg.optionalNestedMessage.bb);
-  }
-
-  public void testNanoOptionalForeignMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    NanoOuterClass.ForeignMessageNano nestedMsg = new NanoOuterClass.ForeignMessageNano();
-    nestedMsg.c = 1;
-    assertFalse(msg.optionalForeignMessage != null);
-    msg.optionalForeignMessage = nestedMsg;
-    assertTrue(msg.optionalForeignMessage != null);
-    assertEquals(1, msg.optionalForeignMessage.c);
-    msg.clear();
-    assertFalse(msg.optionalForeignMessage != null);
-    msg.clear()
-       .optionalForeignMessage = new NanoOuterClass.ForeignMessageNano();
-    msg.optionalForeignMessage.c = 2;
-    assertTrue(msg.optionalForeignMessage != null);
-    msg.clear();
-    assertFalse(msg.optionalForeignMessage != null);
-
-    msg.optionalForeignMessage = nestedMsg;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalForeignMessage != null);
-    assertEquals(1, newMsg.optionalForeignMessage.c);
-  }
-
-  public void testNanoOptionalImportMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    UnittestImportNano.ImportMessageNano nestedMsg = new UnittestImportNano.ImportMessageNano();
-    nestedMsg.d = 1;
-    assertFalse(msg.optionalImportMessage != null);
-    msg.optionalImportMessage = nestedMsg;
-    assertTrue(msg.optionalImportMessage != null);
-    assertEquals(1, msg.optionalImportMessage.d);
-    msg.clear();
-    assertFalse(msg.optionalImportMessage != null);
-    msg.clear()
-       .optionalImportMessage = new UnittestImportNano.ImportMessageNano();
-    msg.optionalImportMessage.d = 2;
-    assertTrue(msg.optionalImportMessage != null);
-    msg.clear();
-    assertFalse(msg.optionalImportMessage != null);
-
-    msg.optionalImportMessage = nestedMsg;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalImportMessage != null);
-    assertEquals(1, newMsg.optionalImportMessage.d);
-  }
-
-  public void testNanoOptionalNestedEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalNestedEnum = TestAllTypesNano.BAR;
-    assertEquals(TestAllTypesNano.BAR, msg.optionalNestedEnum);
-    msg.clear()
-       .optionalNestedEnum = TestAllTypesNano.BAZ;
-    assertEquals(TestAllTypesNano.BAZ, msg.optionalNestedEnum);
-    msg.clear();
-    assertEquals(TestAllTypesNano.FOO, msg.optionalNestedEnum);
-
-    msg.optionalNestedEnum = TestAllTypesNano.BAR;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(TestAllTypesNano.BAR, newMsg.optionalNestedEnum);
-  }
-
-  public void testNanoOptionalForeignEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalForeignEnum = NanoOuterClass.FOREIGN_NANO_BAR;
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, msg.optionalForeignEnum);
-    msg.clear()
-       .optionalForeignEnum = NanoOuterClass.FOREIGN_NANO_BAZ;
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAZ, msg.optionalForeignEnum);
-    msg.clear();
-    assertEquals(NanoOuterClass.FOREIGN_NANO_FOO, msg.optionalForeignEnum);
-
-    msg.optionalForeignEnum = NanoOuterClass.FOREIGN_NANO_BAR;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, newMsg.optionalForeignEnum);
-  }
-
-  public void testNanoOptionalImportEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalImportEnum = UnittestImportNano.IMPORT_NANO_BAR;
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAR, msg.optionalImportEnum);
-    msg.clear()
-       .optionalImportEnum = UnittestImportNano.IMPORT_NANO_BAZ;
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAZ, msg.optionalImportEnum);
-    msg.clear();
-    assertEquals(UnittestImportNano.IMPORT_NANO_FOO, msg.optionalImportEnum);
-
-    msg.optionalImportEnum = UnittestImportNano.IMPORT_NANO_BAR;
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAR, newMsg.optionalImportEnum);
-  }
-
-  public void testNanoOptionalStringPiece() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalStringPiece = "hello";
-    assertEquals("hello", msg.optionalStringPiece);
-    msg.clear();
-    assertTrue(msg.optionalStringPiece.isEmpty());
-    msg.clear()
-       .optionalStringPiece = "hello2";
-    assertEquals("hello2", msg.optionalStringPiece);
-    msg.clear();
-    assertTrue(msg.optionalStringPiece.isEmpty());
-
-    msg.optionalStringPiece = "bye";
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalStringPiece != null);
-    assertEquals("bye", newMsg.optionalStringPiece);
-  }
-
-  public void testNanoOptionalCord() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalCord = "hello";
-    assertEquals("hello", msg.optionalCord);
-    msg.clear();
-    assertTrue(msg.optionalCord.isEmpty());
-    msg.clear()
-       .optionalCord = "hello2";
-    assertEquals("hello2", msg.optionalCord);
-    msg.clear();
-    assertTrue(msg.optionalCord.isEmpty());
-
-    msg.optionalCord = "bye";
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertTrue(newMsg.optionalCord != null);
-    assertEquals("bye", newMsg.optionalCord);
-  }
-
-  public void testNanoRepeatedInt32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedInt32.length);
-    msg.repeatedInt32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedInt32[1]);
-    assertEquals(456, msg.repeatedInt32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedInt32.length);
-    msg.clear()
-       .repeatedInt32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedInt32.length);
-    assertEquals(456, msg.repeatedInt32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedInt32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedInt32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedInt32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedInt32.length);
-    assertEquals(123, newMsg.repeatedInt32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedInt32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedInt32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedInt32.length);
-    assertEquals(123, newMsg.repeatedInt32[0]);
-    assertEquals(456, newMsg.repeatedInt32[1]);
-  }
-
-  public void testNanoRepeatedInt64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedInt64.length);
-    msg.repeatedInt64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedInt64[1]);
-    assertEquals(456, msg.repeatedInt64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedInt64.length);
-    msg.clear()
-       .repeatedInt64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedInt64.length);
-    assertEquals(456, msg.repeatedInt64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedInt64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedInt64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedInt64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedInt64.length);
-    assertEquals(123, newMsg.repeatedInt64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedInt64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedInt64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedInt64.length);
-    assertEquals(123, newMsg.repeatedInt64[0]);
-    assertEquals(456, newMsg.repeatedInt64[1]);
-  }
-
-  public void testNanoRepeatedUint32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedUint32.length);
-    msg.repeatedUint32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedUint32[1]);
-    assertEquals(456, msg.repeatedUint32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedUint32.length);
-    msg.clear()
-       .repeatedUint32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedUint32.length);
-    assertEquals(456, msg.repeatedUint32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedUint32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedUint32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedUint32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedUint32.length);
-    assertEquals(123, newMsg.repeatedUint32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedUint32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedUint32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedUint32.length);
-    assertEquals(123, newMsg.repeatedUint32[0]);
-    assertEquals(456, newMsg.repeatedUint32[1]);
-  }
-
-  public void testNanoRepeatedUint64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedUint64.length);
-    msg.repeatedUint64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedUint64[1]);
-    assertEquals(456, msg.repeatedUint64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedUint64.length);
-    msg.clear()
-       .repeatedUint64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedUint64.length);
-    assertEquals(456, msg.repeatedUint64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedUint64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedUint64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedUint64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedUint64.length);
-    assertEquals(123, newMsg.repeatedUint64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedUint64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedUint64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedUint64.length);
-    assertEquals(123, newMsg.repeatedUint64[0]);
-    assertEquals(456, newMsg.repeatedUint64[1]);
-  }
-
-  public void testNanoRepeatedSint32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedSint32.length);
-    msg.repeatedSint32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedSint32[1]);
-    assertEquals(456, msg.repeatedSint32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSint32.length);
-    msg.clear()
-       .repeatedSint32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedSint32.length);
-    assertEquals(456, msg.repeatedSint32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSint32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedSint32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedSint32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 7);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedSint32.length);
-    assertEquals(123, newMsg.repeatedSint32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedSint32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedSint32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedSint32.length);
-    assertEquals(123, newMsg.repeatedSint32[0]);
-    assertEquals(456, newMsg.repeatedSint32[1]);
-  }
-
-  public void testNanoRepeatedSint64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedSint64.length);
-    msg.repeatedSint64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedSint64[1]);
-    assertEquals(456, msg.repeatedSint64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSint64.length);
-    msg.clear()
-       .repeatedSint64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedSint64.length);
-    assertEquals(456, msg.repeatedSint64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSint64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedSint64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedSint64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 7);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedSint64.length);
-    assertEquals(123, newMsg.repeatedSint64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedSint64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedSint64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedSint64.length);
-    assertEquals(123, newMsg.repeatedSint64[0]);
-    assertEquals(456, newMsg.repeatedSint64[1]);
-  }
-
-  public void testNanoRepeatedFixed32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedFixed32.length);
-    msg.repeatedFixed32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedFixed32[1]);
-    assertEquals(456, msg.repeatedFixed32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFixed32.length);
-    msg.clear()
-       .repeatedFixed32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedFixed32.length);
-    assertEquals(456, msg.repeatedFixed32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFixed32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedFixed32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedFixed32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedFixed32.length);
-    assertEquals(123, newMsg.repeatedFixed32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedFixed32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedFixed32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 15);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedFixed32.length);
-    assertEquals(123, newMsg.repeatedFixed32[0]);
-    assertEquals(456, newMsg.repeatedFixed32[1]);
-  }
-
-  public void testNanoRepeatedFixed64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedFixed64.length);
-    msg.repeatedFixed64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedFixed64[1]);
-    assertEquals(456, msg.repeatedFixed64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFixed64.length);
-    msg.clear()
-       .repeatedFixed64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedFixed64.length);
-    assertEquals(456, msg.repeatedFixed64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFixed64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedFixed64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedFixed64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 13);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedFixed64.length);
-    assertEquals(123, newMsg.repeatedFixed64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedFixed64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedFixed64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 23);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedFixed64.length);
-    assertEquals(123, newMsg.repeatedFixed64[0]);
-    assertEquals(456, newMsg.repeatedFixed64[1]);
-  }
-
-  public void testNanoRepeatedSfixed32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedSfixed32.length);
-    msg.repeatedSfixed32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedSfixed32[1]);
-    assertEquals(456, msg.repeatedSfixed32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSfixed32.length);
-    msg.clear()
-       .repeatedSfixed32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedSfixed32.length);
-    assertEquals(456, msg.repeatedSfixed32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSfixed32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedSfixed32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedSfixed32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedSfixed32.length);
-    assertEquals(123, newMsg.repeatedSfixed32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedSfixed32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedSfixed32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 15);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedSfixed32.length);
-    assertEquals(123, newMsg.repeatedSfixed32[0]);
-    assertEquals(456, newMsg.repeatedSfixed32[1]);
-  }
-
-  public void testNanoRepeatedSfixed64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedSfixed64.length);
-    msg.repeatedSfixed64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedSfixed64[1]);
-    assertEquals(456, msg.repeatedSfixed64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSfixed64.length);
-    msg.clear()
-       .repeatedSfixed64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedSfixed64.length);
-    assertEquals(456, msg.repeatedSfixed64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedSfixed64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedSfixed64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedSfixed64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 13);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedSfixed64.length);
-    assertEquals(123, newMsg.repeatedSfixed64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedSfixed64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedSfixed64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 23);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedSfixed64.length);
-    assertEquals(123, newMsg.repeatedSfixed64[0]);
-    assertEquals(456, newMsg.repeatedSfixed64[1]);
-  }
-
-  public void testNanoRepeatedFloat() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedFloat.length);
-    msg.repeatedFloat = new float[] { 123f, 789f, 456f };
-    assertEquals(789f, msg.repeatedFloat[1]);
-    assertEquals(456f, msg.repeatedFloat[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFloat.length);
-    msg.clear()
-       .repeatedFloat = new float[] { 456f };
-    assertEquals(1, msg.repeatedFloat.length);
-    assertEquals(456f, msg.repeatedFloat[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedFloat.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedFloat = new float[] { 123f };
-    assertEquals(1, msg.repeatedFloat.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedFloat.length);
-    assertEquals(123f, newMsg.repeatedFloat[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedFloat = new float[] { 123f, 456f };
-    assertEquals(2, msg.repeatedFloat.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 15);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedFloat.length);
-    assertEquals(123f, newMsg.repeatedFloat[0]);
-    assertEquals(456f, newMsg.repeatedFloat[1]);
-  }
-
-  public void testNanoRepeatedDouble() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedDouble.length);
-    msg.repeatedDouble = new double[] { 123.0, 789.0, 456.0 };
-    assertEquals(789.0, msg.repeatedDouble[1]);
-    assertEquals(456.0, msg.repeatedDouble[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedDouble.length);
-    msg.clear()
-       .repeatedDouble = new double[] { 456.0 };
-    assertEquals(1, msg.repeatedDouble.length);
-    assertEquals(456.0, msg.repeatedDouble[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedDouble.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedDouble = new double[] { 123.0 };
-    assertEquals(1, msg.repeatedDouble.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 13);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedDouble.length);
-    assertEquals(123.0, newMsg.repeatedDouble[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedDouble = new double[] { 123.0, 456.0 };
-    assertEquals(2, msg.repeatedDouble.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 23);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedDouble.length);
-    assertEquals(123.0, newMsg.repeatedDouble[0]);
-    assertEquals(456.0, newMsg.repeatedDouble[1]);
-  }
-
-  public void testNanoRepeatedBool() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedBool.length);
-    msg.repeatedBool = new boolean[] { false, true, false };
-    assertTrue(msg.repeatedBool[1]);
-    assertFalse(msg.repeatedBool[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedBool.length);
-    msg.clear()
-       .repeatedBool = new boolean[] { true };
-    assertEquals(1, msg.repeatedBool.length);
-    assertTrue(msg.repeatedBool[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedBool.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedBool = new boolean[] { false };
-    assertEquals(1, msg.repeatedBool.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedBool.length);
-    assertFalse(newMsg.repeatedBool[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedBool = new boolean[] { true, false };
-    assertEquals(2, msg.repeatedBool.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedBool.length);
-    assertTrue(newMsg.repeatedBool[0]);
-    assertFalse(newMsg.repeatedBool[1]);
-  }
-
-  public void testNanoRepeatedString() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedString.length);
-    msg.repeatedString = new String[] { "hello", "bye", "boo" };
-    assertEquals("bye", msg.repeatedString[1]);
-    assertEquals("boo", msg.repeatedString[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedString.length);
-    msg.clear()
-       .repeatedString = new String[] { "boo" };
-    assertEquals(1, msg.repeatedString.length);
-    assertEquals("boo", msg.repeatedString[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedString.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedString = new String[] { "" };
-    assertEquals(1, msg.repeatedString.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedString.length);
-    assertTrue(newMsg.repeatedString[0].isEmpty());
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedString = new String[] { "hello", "world" };
-    assertEquals(2, msg.repeatedString.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 19);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedString.length);
-    assertEquals("hello", newMsg.repeatedString[0]);
-    assertEquals("world", newMsg.repeatedString[1]);
-  }
-
-  public void testNanoRepeatedBytes() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedBytes.length);
-    msg.repeatedBytes = new byte[][] {
-        InternalNano.copyFromUtf8("hello"),
-        InternalNano.copyFromUtf8("bye"),
-        InternalNano.copyFromUtf8("boo")
-    };
-    assertEquals("bye", new String(msg.repeatedBytes[1], InternalNano.UTF_8));
-    assertEquals("boo", new String(msg.repeatedBytes[2], InternalNano.UTF_8));
-    msg.clear();
-    assertEquals(0, msg.repeatedBytes.length);
-    msg.clear()
-       .repeatedBytes = new byte[][] { InternalNano.copyFromUtf8("boo") };
-    assertEquals(1, msg.repeatedBytes.length);
-    assertEquals("boo", new String(msg.repeatedBytes[0], InternalNano.UTF_8));
-    msg.clear();
-    assertEquals(0, msg.repeatedBytes.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedBytes = new byte[][] { InternalNano.copyFromUtf8("") };
-    assertEquals(1, msg.repeatedBytes.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedBytes.length);
-    assertTrue(newMsg.repeatedBytes[0].length == 0);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedBytes = new byte[][] {
-      InternalNano.copyFromUtf8("hello"),
-      InternalNano.copyFromUtf8("world")
-    };
-    assertEquals(2, msg.repeatedBytes.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 19);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedBytes.length);
-    assertEquals("hello", new String(newMsg.repeatedBytes[0], InternalNano.UTF_8));
-    assertEquals("world", new String(newMsg.repeatedBytes[1], InternalNano.UTF_8));
-  }
-
-  public void testNanoRepeatedGroup() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    TestAllTypesNano.RepeatedGroup group0 =
-      new TestAllTypesNano.RepeatedGroup();
-    group0.a = 0;
-    TestAllTypesNano.RepeatedGroup group1 =
-      new TestAllTypesNano.RepeatedGroup();
-    group1.a = 1;
-    TestAllTypesNano.RepeatedGroup group2 =
-      new TestAllTypesNano.RepeatedGroup();
-    group2.a = 2;
-
-    msg.repeatedGroup = new TestAllTypesNano.RepeatedGroup[] { group0, group1, group2 };
-    assertEquals(3, msg.repeatedGroup.length);
-    assertEquals(0, msg.repeatedGroup[0].a);
-    assertEquals(1, msg.repeatedGroup[1].a);
-    assertEquals(2, msg.repeatedGroup[2].a);
-    msg.clear();
-    assertEquals(0, msg.repeatedGroup.length);
-    msg.clear()
-       .repeatedGroup = new TestAllTypesNano.RepeatedGroup[] { group1 };
-    assertEquals(1, msg.repeatedGroup.length);
-    assertEquals(1, msg.repeatedGroup[0].a);
-    msg.clear();
-    assertEquals(0, msg.repeatedGroup.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedGroup = new TestAllTypesNano.RepeatedGroup[] { group0 };
-    assertEquals(1, msg.repeatedGroup.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 7);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedGroup.length);
-    assertEquals(0, newMsg.repeatedGroup[0].a);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedGroup = new TestAllTypesNano.RepeatedGroup[] { group0, group1 };
-    assertEquals(2, msg.repeatedGroup.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 14);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedGroup.length);
-    assertEquals(0, newMsg.repeatedGroup[0].a);
-    assertEquals(1, newMsg.repeatedGroup[1].a);
-  }
-
-  public void testNanoRepeatedNestedMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    TestAllTypesNano.NestedMessage nestedMsg0 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg0.bb = 0;
-    TestAllTypesNano.NestedMessage nestedMsg1 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg1.bb = 1;
-    TestAllTypesNano.NestedMessage nestedMsg2 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg2.bb = 2;
-
-    msg.repeatedNestedMessage =
-        new TestAllTypesNano.NestedMessage[] { nestedMsg0, nestedMsg1, nestedMsg2 };
-    assertEquals(3, msg.repeatedNestedMessage.length);
-    assertEquals(0, msg.repeatedNestedMessage[0].bb);
-    assertEquals(1, msg.repeatedNestedMessage[1].bb);
-    assertEquals(2, msg.repeatedNestedMessage[2].bb);
-    msg.clear();
-    assertEquals(0, msg.repeatedNestedMessage.length);
-    msg.clear()
-       .repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] { nestedMsg1 };
-    assertEquals(1, msg.repeatedNestedMessage.length);
-    assertEquals(1, msg.repeatedNestedMessage[0].bb);
-    msg.clear();
-    assertEquals(0, msg.repeatedNestedMessage.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] { nestedMsg0 };
-    assertEquals(1, msg.repeatedNestedMessage.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedNestedMessage.length);
-    assertEquals(0, newMsg.repeatedNestedMessage[0].bb);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] { nestedMsg0, nestedMsg1 };
-    assertEquals(2, msg.repeatedNestedMessage.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedNestedMessage.length);
-    assertEquals(0, newMsg.repeatedNestedMessage[0].bb);
-    assertEquals(1, newMsg.repeatedNestedMessage[1].bb);
-  }
-
-  public void testNanoRepeatedForeignMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    NanoOuterClass.ForeignMessageNano foreignMsg0 =
-      new NanoOuterClass.ForeignMessageNano();
-    foreignMsg0.c = 0;
-    NanoOuterClass.ForeignMessageNano foreignMsg1 =
-      new NanoOuterClass.ForeignMessageNano();
-    foreignMsg1.c = 1;
-    NanoOuterClass.ForeignMessageNano foreignMsg2 =
-      new NanoOuterClass.ForeignMessageNano();
-    foreignMsg2.c = 2;
-
-    msg.repeatedForeignMessage =
-        new NanoOuterClass.ForeignMessageNano[] { foreignMsg0, foreignMsg1, foreignMsg2 };
-    assertEquals(3, msg.repeatedForeignMessage.length);
-    assertEquals(0, msg.repeatedForeignMessage[0].c);
-    assertEquals(1, msg.repeatedForeignMessage[1].c);
-    assertEquals(2, msg.repeatedForeignMessage[2].c);
-    msg.clear();
-    assertEquals(0, msg.repeatedForeignMessage.length);
-    msg.clear()
-       .repeatedForeignMessage = new NanoOuterClass.ForeignMessageNano[] { foreignMsg1 };
-    assertEquals(1, msg.repeatedForeignMessage.length);
-    assertEquals(1, msg.repeatedForeignMessage[0].c);
-    msg.clear();
-    assertEquals(0, msg.repeatedForeignMessage.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedForeignMessage = new NanoOuterClass.ForeignMessageNano[] { foreignMsg0 };
-    assertEquals(1, msg.repeatedForeignMessage.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedForeignMessage.length);
-    assertEquals(0, newMsg.repeatedForeignMessage[0].c);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedForeignMessage = new NanoOuterClass.ForeignMessageNano[] { foreignMsg0, foreignMsg1 };
-    assertEquals(2, msg.repeatedForeignMessage.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedForeignMessage.length);
-    assertEquals(0, newMsg.repeatedForeignMessage[0].c);
-    assertEquals(1, newMsg.repeatedForeignMessage[1].c);
-  }
-
-  public void testNanoRepeatedImportMessage() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    UnittestImportNano.ImportMessageNano foreignMsg0 =
-      new UnittestImportNano.ImportMessageNano();
-    foreignMsg0.d = 0;
-    UnittestImportNano.ImportMessageNano foreignMsg1 =
-      new UnittestImportNano.ImportMessageNano();
-    foreignMsg1.d = 1;
-    UnittestImportNano.ImportMessageNano foreignMsg2 =
-      new UnittestImportNano.ImportMessageNano();
-    foreignMsg2.d = 2;
-
-    msg.repeatedImportMessage =
-        new UnittestImportNano.ImportMessageNano[] { foreignMsg0, foreignMsg1, foreignMsg2 };
-    assertEquals(3, msg.repeatedImportMessage.length);
-    assertEquals(0, msg.repeatedImportMessage[0].d);
-    assertEquals(1, msg.repeatedImportMessage[1].d);
-    assertEquals(2, msg.repeatedImportMessage[2].d);
-    msg.clear();
-    assertEquals(0, msg.repeatedImportMessage.length);
-    msg.clear()
-       .repeatedImportMessage = new UnittestImportNano.ImportMessageNano[] { foreignMsg1 };
-    assertEquals(1, msg.repeatedImportMessage.length);
-    assertEquals(1, msg.repeatedImportMessage[0].d);
-    msg.clear();
-    assertEquals(0, msg.repeatedImportMessage.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedImportMessage = new UnittestImportNano.ImportMessageNano[] { foreignMsg0 };
-    assertEquals(1, msg.repeatedImportMessage.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedImportMessage.length);
-    assertEquals(0, newMsg.repeatedImportMessage[0].d);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedImportMessage = new UnittestImportNano.ImportMessageNano[] { foreignMsg0, foreignMsg1 };
-    assertEquals(2, msg.repeatedImportMessage.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedImportMessage.length);
-    assertEquals(0, newMsg.repeatedImportMessage[0].d);
-    assertEquals(1, newMsg.repeatedImportMessage[1].d);
-  }
-
-  public void testNanoRepeatedNestedEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedNestedEnum = new int[] {
-        TestAllTypesNano.FOO,
-        TestAllTypesNano.BAR,
-        TestAllTypesNano.BAZ
-    };
-    assertEquals(3, msg.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedNestedEnum[1]);
-    assertEquals(TestAllTypesNano.BAZ, msg.repeatedNestedEnum[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedNestedEnum.length);
-    msg.clear()
-       .repeatedNestedEnum = new int[] { TestAllTypesNano.BAR };
-    assertEquals(1, msg.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedNestedEnum[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedNestedEnum.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedNestedEnum = new int[] { TestAllTypesNano.FOO };
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedNestedEnum[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedNestedEnum = new int[] { TestAllTypesNano.FOO, TestAllTypesNano.BAR };
-    assertEquals(2, msg.repeatedNestedEnum.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedNestedEnum[1]);
-  }
-
-  public void testNanoRepeatedForeignEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedForeignEnum = new int[] {
-        NanoOuterClass.FOREIGN_NANO_FOO,
-        NanoOuterClass.FOREIGN_NANO_BAR,
-        NanoOuterClass.FOREIGN_NANO_BAZ
-    };
-    assertEquals(3, msg.repeatedForeignEnum.length);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_FOO, msg.repeatedForeignEnum[0]);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, msg.repeatedForeignEnum[1]);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAZ, msg.repeatedForeignEnum[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedForeignEnum.length);
-    msg.clear()
-       .repeatedForeignEnum = new int[] { NanoOuterClass.FOREIGN_NANO_BAR };
-    assertEquals(1, msg.repeatedForeignEnum.length);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, msg.repeatedForeignEnum[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedForeignEnum.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedForeignEnum = new int[] { NanoOuterClass.FOREIGN_NANO_FOO };
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedForeignEnum.length);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_FOO, msg.repeatedForeignEnum[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedForeignEnum = new int[] {
-      NanoOuterClass.FOREIGN_NANO_FOO,
-      NanoOuterClass.FOREIGN_NANO_BAR
-    };
-    assertEquals(2, msg.repeatedForeignEnum.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedForeignEnum.length);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_FOO, msg.repeatedForeignEnum[0]);
-    assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, msg.repeatedForeignEnum[1]);
-  }
-
-  public void testNanoRepeatedImportEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedImportEnum = new int[] {
-        UnittestImportNano.IMPORT_NANO_FOO,
-        UnittestImportNano.IMPORT_NANO_BAR,
-        UnittestImportNano.IMPORT_NANO_BAZ
-    };
-    assertEquals(3, msg.repeatedImportEnum.length);
-    assertEquals(UnittestImportNano.IMPORT_NANO_FOO, msg.repeatedImportEnum[0]);
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAR, msg.repeatedImportEnum[1]);
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAZ, msg.repeatedImportEnum[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedImportEnum.length);
-    msg.clear()
-       .repeatedImportEnum = new int[] { UnittestImportNano.IMPORT_NANO_BAR };
-    assertEquals(1, msg.repeatedImportEnum.length);
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAR, msg.repeatedImportEnum[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedImportEnum.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedImportEnum = new int[] { UnittestImportNano.IMPORT_NANO_FOO };
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedImportEnum.length);
-    assertEquals(UnittestImportNano.IMPORT_NANO_FOO, msg.repeatedImportEnum[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedImportEnum = new int[] {
-      UnittestImportNano.IMPORT_NANO_FOO,
-      UnittestImportNano.IMPORT_NANO_BAR
-    };
-    assertEquals(2, msg.repeatedImportEnum.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedImportEnum.length);
-    assertEquals(UnittestImportNano.IMPORT_NANO_FOO, msg.repeatedImportEnum[0]);
-    assertEquals(UnittestImportNano.IMPORT_NANO_BAR, msg.repeatedImportEnum[1]);
-  }
-
-  public void testNanoRepeatedStringPiece() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedStringPiece.length);
-    msg.repeatedStringPiece = new String[] { "hello", "bye", "boo" };
-    assertEquals("bye", msg.repeatedStringPiece[1]);
-    assertEquals("boo", msg.repeatedStringPiece[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedStringPiece.length);
-    msg.clear()
-       .repeatedStringPiece = new String[] { "boo" };
-    assertEquals(1, msg.repeatedStringPiece.length);
-    assertEquals("boo", msg.repeatedStringPiece[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedStringPiece.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedStringPiece = new String[] { "" };
-    assertEquals(1, msg.repeatedStringPiece.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedStringPiece.length);
-    assertTrue(newMsg.repeatedStringPiece[0].isEmpty());
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedStringPiece = new String[] { "hello", "world" };
-    assertEquals(2, msg.repeatedStringPiece.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 19);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedStringPiece.length);
-    assertEquals("hello", newMsg.repeatedStringPiece[0]);
-    assertEquals("world", newMsg.repeatedStringPiece[1]);
-  }
-
-  public void testNanoRepeatedCord() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedCord.length);
-    msg.repeatedCord = new String[] { "hello", "bye", "boo" };
-    assertEquals("bye", msg.repeatedCord[1]);
-    assertEquals("boo", msg.repeatedCord[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedCord.length);
-    msg.clear()
-       .repeatedCord = new String[] { "boo" };
-    assertEquals(1, msg.repeatedCord.length);
-    assertEquals("boo", msg.repeatedCord[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedCord.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedCord = new String[] { "" };
-    assertEquals(1, msg.repeatedCord.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 6);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedCord.length);
-    assertTrue(newMsg.repeatedCord[0].isEmpty());
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedCord = new String[] { "hello", "world" };
-    assertEquals(2, msg.repeatedCord.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 19);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedCord.length);
-    assertEquals("hello", newMsg.repeatedCord[0]);
-    assertEquals("world", newMsg.repeatedCord[1]);
-  }
-
-  public void testNanoRepeatedPackedInt32() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedPackedInt32.length);
-    msg.repeatedPackedInt32 = new int[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedPackedInt32[1]);
-    assertEquals(456, msg.repeatedPackedInt32[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedInt32.length);
-    msg.clear()
-       .repeatedPackedInt32 = new int[] { 456 };
-    assertEquals(1, msg.repeatedPackedInt32.length);
-    assertEquals(456, msg.repeatedPackedInt32[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedInt32.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedPackedInt32 = new int[] { 123 };
-    assertEquals(1, msg.repeatedPackedInt32.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 7);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedPackedInt32.length);
-    assertEquals(123, newMsg.repeatedPackedInt32[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedPackedInt32 = new int[] { 123, 456 };
-    assertEquals(2, msg.repeatedPackedInt32.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 9);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedPackedInt32.length);
-    assertEquals(123, newMsg.repeatedPackedInt32[0]);
-    assertEquals(456, newMsg.repeatedPackedInt32[1]);
-  }
-
-  public void testNanoRepeatedPackedSfixed64() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    assertEquals(0, msg.repeatedPackedSfixed64.length);
-    msg.repeatedPackedSfixed64 = new long[] { 123, 789, 456 };
-    assertEquals(789, msg.repeatedPackedSfixed64[1]);
-    assertEquals(456, msg.repeatedPackedSfixed64[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedSfixed64.length);
-    msg.clear()
-       .repeatedPackedSfixed64 = new long[] { 456 };
-    assertEquals(1, msg.repeatedPackedSfixed64.length);
-    assertEquals(456, msg.repeatedPackedSfixed64[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedSfixed64.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedPackedSfixed64 = new long[] { 123 };
-    assertEquals(1, msg.repeatedPackedSfixed64.length);
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 14);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedPackedSfixed64.length);
-    assertEquals(123, newMsg.repeatedPackedSfixed64[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedPackedSfixed64 = new long[] { 123, 456 };
-    assertEquals(2, msg.repeatedPackedSfixed64.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 22);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedPackedSfixed64.length);
-    assertEquals(123, newMsg.repeatedPackedSfixed64[0]);
-    assertEquals(456, newMsg.repeatedPackedSfixed64[1]);
-  }
-
-  public void testNanoRepeatedPackedNestedEnum() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedPackedNestedEnum = new int[] {
-        TestAllTypesNano.FOO,
-        TestAllTypesNano.BAR,
-        TestAllTypesNano.BAZ
-    };
-    assertEquals(3, msg.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedPackedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedPackedNestedEnum[1]);
-    assertEquals(TestAllTypesNano.BAZ, msg.repeatedPackedNestedEnum[2]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedNestedEnum.length);
-    msg.clear()
-       .repeatedPackedNestedEnum = new int[] { TestAllTypesNano.BAR };
-    assertEquals(1, msg.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedPackedNestedEnum[0]);
-    msg.clear();
-    assertEquals(0, msg.repeatedPackedNestedEnum.length);
-
-    // Test 1 entry
-    msg.clear()
-       .repeatedPackedNestedEnum = new int[] { TestAllTypesNano.FOO };
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 7);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(1, newMsg.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedPackedNestedEnum[0]);
-
-    // Test 2 entries
-    msg.clear()
-       .repeatedPackedNestedEnum = new int[] { TestAllTypesNano.FOO, TestAllTypesNano.BAR };
-    assertEquals(2, msg.repeatedPackedNestedEnum.length);
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 8);
-    assertEquals(result.length, msgSerializedSize);
-
-    newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(2, newMsg.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, msg.repeatedPackedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.BAR, msg.repeatedPackedNestedEnum[1]);
-  }
-
-  public void testNanoRepeatedPackedSerializedSize() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedPackedInt32 = new int[] { 123, 789, 456 };
-    int msgSerializedSize = msg.getSerializedSize();
-    byte [] result = MessageNano.toByteArray(msg);
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 11);
-    assertEquals(result.length, msgSerializedSize);
-    TestAllTypesNano msg2 = new TestAllTypesNano();
-    msg2.repeatedPackedInt32 = new int[] { 123, 789, 456 };
-    byte [] result2 = new byte[msgSerializedSize];
-    MessageNano.toByteArray(msg2, result2, 0, msgSerializedSize);
-
-    // Check equal size and content.
-    assertEquals(msgSerializedSize, msg2.getSerializedSize());
-    assertTrue(Arrays.equals(result, result2));
-  }
-
-  public void testNanoRepeatedInt32ReMerge() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedInt32 = new int[] { 234 };
-    byte [] result1 = MessageNano.toByteArray(msg);
-
-    msg.clear().optionalInt32 = 789;
-    byte [] result2 = MessageNano.toByteArray(msg);
-
-    msg.clear().repeatedInt32 = new int[] { 123, 456 };
-    byte [] result3 = MessageNano.toByteArray(msg);
-
-    // Concatenate the three serializations and read as one message.
-    byte [] result = new byte[result1.length + result2.length + result3.length];
-    System.arraycopy(result1, 0, result, 0, result1.length);
-    System.arraycopy(result2, 0, result, result1.length, result2.length);
-    System.arraycopy(result3, 0, result, result1.length + result2.length, result3.length);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(789, newMsg.optionalInt32);
-    assertEquals(3, newMsg.repeatedInt32.length);
-    assertEquals(234, newMsg.repeatedInt32[0]);
-    assertEquals(123, newMsg.repeatedInt32[1]);
-    assertEquals(456, newMsg.repeatedInt32[2]);
-  }
-
-  public void testNanoRepeatedNestedEnumReMerge() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.repeatedNestedEnum = new int[] { TestAllTypesNano.FOO };
-    byte [] result1 = MessageNano.toByteArray(msg);
-
-    msg.clear().optionalInt32 = 789;
-    byte [] result2 = MessageNano.toByteArray(msg);
-
-    msg.clear().repeatedNestedEnum = new int[] { TestAllTypesNano.BAR, TestAllTypesNano.FOO };
-    byte [] result3 = MessageNano.toByteArray(msg);
-
-    // Concatenate the three serializations and read as one message.
-    byte [] result = new byte[result1.length + result2.length + result3.length];
-    System.arraycopy(result1, 0, result, 0, result1.length);
-    System.arraycopy(result2, 0, result, result1.length, result2.length);
-    System.arraycopy(result3, 0, result, result1.length + result2.length, result3.length);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(789, newMsg.optionalInt32);
-    assertEquals(3, newMsg.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, newMsg.repeatedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.BAR, newMsg.repeatedNestedEnum[1]);
-    assertEquals(TestAllTypesNano.FOO, newMsg.repeatedNestedEnum[2]);
-  }
-
-  public void testNanoRepeatedNestedMessageReMerge() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    TestAllTypesNano.NestedMessage nestedMsg0 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg0.bb = 0;
-    TestAllTypesNano.NestedMessage nestedMsg1 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg1.bb = 1;
-    TestAllTypesNano.NestedMessage nestedMsg2 =
-      new TestAllTypesNano.NestedMessage();
-    nestedMsg2.bb = 2;
-
-    msg.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] { nestedMsg0 };
-    byte [] result1 = MessageNano.toByteArray(msg);
-
-    msg.clear().optionalInt32 = 789;
-    byte [] result2 = MessageNano.toByteArray(msg);
-
-    msg.clear().repeatedNestedMessage =
-        new TestAllTypesNano.NestedMessage[] { nestedMsg1, nestedMsg2 };
-    byte [] result3 = MessageNano.toByteArray(msg);
-
-    // Concatenate the three serializations and read as one message.
-    byte [] result = new byte[result1.length + result2.length + result3.length];
-    System.arraycopy(result1, 0, result, 0, result1.length);
-    System.arraycopy(result2, 0, result, result1.length, result2.length);
-    System.arraycopy(result3, 0, result, result1.length + result2.length, result3.length);
-
-    TestAllTypesNano newMsg = TestAllTypesNano.parseFrom(result);
-    assertEquals(789, newMsg.optionalInt32);
-    assertEquals(3, newMsg.repeatedNestedMessage.length);
-    assertEquals(nestedMsg0.bb, newMsg.repeatedNestedMessage[0].bb);
-    assertEquals(nestedMsg1.bb, newMsg.repeatedNestedMessage[1].bb);
-    assertEquals(nestedMsg2.bb, newMsg.repeatedNestedMessage[2].bb);
-  }
-
-  /**
-   * Tests that invalid enum values from the wire are not accepted.
-   */
-  public void testNanoEnumValidity() throws Exception {
-    final int invalid = 120;
-    final int alsoInvalid = 121;
-
-    EnumValidity.M m = new EnumValidity.M();
-    // Sanity check & baseline of the assertions for the first case below.
-    assertEquals(EnumValidity.E.default_, m.optionalE);
-    assertEquals(EnumValidity.E.BAZ, m.defaultE);
-
-    m.optionalE = invalid;
-    m.defaultE = invalid;
-    // E contains all valid values
-    m.repeatedE = new int[] {EnumValidity.E.FOO, EnumValidity.E.BAR};
-    m.packedE = new int[] {EnumValidity.E.FOO, EnumValidity.E.BAZ};
-    // E2 contains some invalid values
-    m.repeatedE2 = new int[] {invalid, EnumValidity.E.BAR, alsoInvalid};
-    m.packedE2 = new int[] {EnumValidity.E.FOO, invalid, alsoInvalid};
-    // E3 contains all invalid values
-    m.repeatedE3 = new int[] {invalid, invalid};
-    m.packedE3 = new int[] {alsoInvalid, alsoInvalid};
-    byte[] serialized = MessageNano.toByteArray(m);
-    // Sanity check that we do have all data in the byte array.
-    assertEquals(31, serialized.length);
-
-    // Test 1: tests that invalid values aren't included in the deserialized message.
-    EnumValidity.M deserialized = MessageNano.mergeFrom(new EnumValidity.M(), serialized);
-    assertEquals(EnumValidity.E.default_, deserialized.optionalE);
-    assertEquals(EnumValidity.E.BAZ, deserialized.defaultE);
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.FOO, EnumValidity.E.BAR}, deserialized.repeatedE));
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.FOO, EnumValidity.E.BAZ}, deserialized.packedE));
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.BAR}, deserialized.repeatedE2));
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.FOO}, deserialized.packedE2));
-    assertEquals(0, deserialized.repeatedE3.length);
-    assertEquals(0, deserialized.packedE3.length);
-
-    // Test 2: tests that invalid values do not override previous values in the field, including
-    // arrays, including pre-existing invalid values.
-    deserialized.optionalE = EnumValidity.E.BAR;
-    deserialized.defaultE = alsoInvalid;
-    deserialized.repeatedE = new int[] {EnumValidity.E.BAZ};
-    deserialized.packedE = new int[] {EnumValidity.E.BAZ, alsoInvalid};
-    deserialized.repeatedE2 = new int[] {invalid, alsoInvalid};
-    deserialized.packedE2 = null;
-    deserialized.repeatedE3 = null;
-    deserialized.packedE3 = new int[0];
-    MessageNano.mergeFrom(deserialized, serialized);
-    assertEquals(EnumValidity.E.BAR, deserialized.optionalE);
-    assertEquals(alsoInvalid, deserialized.defaultE);
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.BAZ, /* + */ EnumValidity.E.FOO, EnumValidity.E.BAR},
-        deserialized.repeatedE));
-    assertTrue(Arrays.equals(
-        new int[] {EnumValidity.E.BAZ, alsoInvalid, /* + */ EnumValidity.E.FOO, EnumValidity.E.BAZ},
-        deserialized.packedE));
-    assertTrue(Arrays.equals(
-        new int[] {invalid, alsoInvalid, /* + */ EnumValidity.E.BAR},
-        deserialized.repeatedE2));
-    assertTrue(Arrays.equals(
-        new int[] {/* <null> + */ EnumValidity.E.FOO},
-        deserialized.packedE2));
-    assertNull(deserialized.repeatedE3); // null + all invalid == null
-    assertEquals(0, deserialized.packedE3.length); // empty + all invalid == empty
-
-    // Test 3: reading by alternative forms
-    EnumValidity.Alt alt = MessageNano.mergeFrom(new EnumValidity.Alt(), serialized);
-    assertEquals(EnumValidity.E.BAR, // last valid value in m.repeatedE2
-        alt.repeatedE2AsOptional);
-    assertTrue(Arrays.equals(new int[] {EnumValidity.E.FOO}, alt.packedE2AsNonPacked));
-    assertEquals(0, alt.nonPackedE3AsPacked.length);
-  }
-
-  /**
-   * Tests the same as {@link #testNanoEnumValidity()} with accessor style. Repeated fields are
-   * not re-tested here because they are not affected by the accessor style.
-   */
-  public void testNanoEnumValidityAccessors() throws Exception {
-    final int invalid = 120;
-    final int alsoInvalid = 121;
-
-    EnumValidityAccessors.M m = new EnumValidityAccessors.M();
-    // Sanity check & baseline of the assertions for the first case below.
-    assertEquals(EnumValidityAccessors.default_, m.getOptionalE());
-    assertEquals(EnumValidityAccessors.BAZ, m.getDefaultE());
-
-    m.setOptionalE(invalid);
-    m.setDefaultE(invalid);
-    // Set repeatedE2 for Alt.repeatedE2AsOptional
-    m.repeatedE2 = new int[] {invalid, EnumValidityAccessors.BAR, alsoInvalid};
-    byte[] serialized = MessageNano.toByteArray(m);
-    // Sanity check that we do have all data in the byte array.
-    assertEquals(10, serialized.length);
-
-    // Test 1: tests that invalid values aren't included in the deserialized message.
-    EnumValidityAccessors.M deserialized =
-        MessageNano.mergeFrom(new EnumValidityAccessors.M(), serialized);
-    assertEquals(EnumValidityAccessors.default_, deserialized.getOptionalE());
-    assertEquals(EnumValidityAccessors.BAZ, deserialized.getDefaultE());
-
-    // Test 2: tests that invalid values do not override previous values in the field, including
-    // pre-existing invalid values.
-    deserialized.setOptionalE(EnumValidityAccessors.BAR);
-    deserialized.setDefaultE(alsoInvalid);
-    MessageNano.mergeFrom(deserialized, serialized);
-    assertEquals(EnumValidityAccessors.BAR, deserialized.getOptionalE());
-    assertEquals(alsoInvalid, deserialized.getDefaultE());
-
-    // Test 3: reading by alternative forms
-    EnumValidityAccessors.Alt alt =
-        MessageNano.mergeFrom(new EnumValidityAccessors.Alt(), serialized);
-    assertEquals(EnumValidityAccessors.BAR, // last valid value in m.repeatedE2
-        alt.getRepeatedE2AsOptional());
-  }
-
-  /**
-   * Tests that code generation correctly wraps a single message into its outer
-   * class. The class {@code SingleMessageNano} is imported from the outer
-   * class {@code UnittestSingleNano}, whose name is implicit. Any error would
-   * cause this method to fail compilation.
-   */
-  public void testNanoSingle() throws Exception {
-    SingleMessageNano msg = new SingleMessageNano();
-    assertNotNull(msg);
-  }
-
-  /**
-   * Tests that code generation correctly skips generating the outer class if
-   * unnecessary, letting a file-scope entity have the same name. The class
-   * {@code MultipleNameClashNano} shares the same name with the file's outer
-   * class defined explicitly, but the file contains no other entities and has
-   * java_multiple_files set. Any error would cause this method to fail
-   * compilation.
-   */
-  public void testNanoMultipleNameClash() throws Exception {
-    MultipleNameClashNano msg = new MultipleNameClashNano();
-    msg.field = 0;
-  }
-
-  /**
-   * Tests that code generation correctly handles enums in different scopes in
-   * a source file with the option java_multiple_files set to true. Any error
-   * would cause this method to fail compilation.
-   */
-  public void testNanoMultipleEnumScoping() throws Exception {
-    FileScopeEnumRefNano msg1 = new FileScopeEnumRefNano();
-    msg1.enumField = UnittestMultipleNano.ONE;
-    MessageScopeEnumRefNano msg2 = new MessageScopeEnumRefNano();
-    msg2.enumField = MessageScopeEnumRefNano.TWO;
-  }
-
-  /**
-   * Tests that code generation with mixed values of the java_multiple_files
-   * options between the main source file and the imported source files would
-   * generate correct references. Any error would cause this method to fail
-   * compilation.
-   */
-  public void testNanoMultipleImportingNonMultiple() throws Exception {
-    UnittestImportNano.ImportMessageNano importMsg = new UnittestImportNano.ImportMessageNano();
-    MultipleImportingNonMultipleNano1 nano1 = new MultipleImportingNonMultipleNano1();
-    nano1.field = importMsg;
-    MultipleImportingNonMultipleNano2 nano2 = new MultipleImportingNonMultipleNano2();
-    nano2.nano1 = nano1;
-  }
-
-  public void testNanoDefaults() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    for (int i = 0; i < 2; i++) {
-      assertEquals(41, msg.defaultInt32);
-      assertEquals(42, msg.defaultInt64);
-      assertEquals(43, msg.defaultUint32);
-      assertEquals(44, msg.defaultUint64);
-      assertEquals(-45, msg.defaultSint32);
-      assertEquals(46, msg.defaultSint64);
-      assertEquals(47, msg.defaultFixed32);
-      assertEquals(48, msg.defaultFixed64);
-      assertEquals(49, msg.defaultSfixed32);
-      assertEquals(-50, msg.defaultSfixed64);
-      assertTrue(51.5f == msg.defaultFloat);
-      assertTrue(52.0e3 == msg.defaultDouble);
-      assertEquals(true, msg.defaultBool);
-      assertEquals("hello", msg.defaultString);
-      assertEquals("world", new String(msg.defaultBytes, InternalNano.UTF_8));
-      assertEquals("dünya", msg.defaultStringNonascii);
-      assertEquals("dünyab", new String(msg.defaultBytesNonascii, InternalNano.UTF_8));
-      assertEquals(TestAllTypesNano.BAR, msg.defaultNestedEnum);
-      assertEquals(NanoOuterClass.FOREIGN_NANO_BAR, msg.defaultForeignEnum);
-      assertEquals(UnittestImportNano.IMPORT_NANO_BAR, msg.defaultImportEnum);
-      assertEquals(Float.POSITIVE_INFINITY, msg.defaultFloatInf);
-      assertEquals(Float.NEGATIVE_INFINITY, msg.defaultFloatNegInf);
-      assertEquals(Float.NaN, msg.defaultFloatNan);
-      assertEquals(Double.POSITIVE_INFINITY, msg.defaultDoubleInf);
-      assertEquals(Double.NEGATIVE_INFINITY, msg.defaultDoubleNegInf);
-      assertEquals(Double.NaN, msg.defaultDoubleNan);
-
-      // Default values are not output, except for required fields.
-      byte [] result = MessageNano.toByteArray(msg);
-      int msgSerializedSize = msg.getSerializedSize();
-      //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-      assertTrue(msgSerializedSize == 3);
-      assertEquals(result.length, msgSerializedSize);
-      msg.clear();
-    }
-  }
-
-  public void testDifferentStringLengthsNano() throws Exception {
-    // Test string serialization roundtrip using strings of the following lengths,
-    // with ASCII and Unicode characters requiring different UTF-8 byte counts per
-    // char, hence causing the length delimiter varint to sometimes require more
-    // bytes for the Unicode strings than the ASCII string of the same length.
-    int[] lengths = new int[] {
-            0,
-            1,
-            (1 << 4) - 1,  // 1 byte for ASCII and Unicode
-            (1 << 7) - 1,  // 1 byte for ASCII, 2 bytes for Unicode
-            (1 << 11) - 1, // 2 bytes for ASCII and Unicode
-            (1 << 14) - 1, // 2 bytes for ASCII, 3 bytes for Unicode
-            (1 << 17) - 1, // 3 bytes for ASCII and Unicode
-    };
-    for (int i : lengths) {
-      testEncodingOfString('q', i);      // 1 byte per char
-      testEncodingOfString('\u07FF', i); // 2 bytes per char
-      testEncodingOfString('\u0981', i); // 3 bytes per char
-    }
-  }
-
-  /** Regression test for https://github.com/google/protobuf/issues/292 */
-  public void testCorrectExceptionThrowWhenEncodingStringsWithoutEnoughSpace() throws Exception {
-    String testCase = "Foooooooo";
-    assertEquals(CodedOutputByteBufferNano.computeRawVarint32Size(testCase.length()),
-            CodedOutputByteBufferNano.computeRawVarint32Size(testCase.length() * 3));
-    assertEquals(11, CodedOutputByteBufferNano.computeStringSize(1, testCase));
-    // Tag is one byte, varint describing string length is 1 byte, string length is 9 bytes.
-    // An array of size 1 will cause a failure when trying to write the varint.
-    for (int i = 0; i < 11; i++) {
-      CodedOutputByteBufferNano bufferNano = CodedOutputByteBufferNano.newInstance(new byte[i]);
-      try {
-        bufferNano.writeString(1, testCase);
-        fail("Should have thrown an out of space exception");
-      } catch (CodedOutputByteBufferNano.OutOfSpaceException expected) {}
-    }
-  }
-
-  private void testEncodingOfString(char c, int length) throws InvalidProtocolBufferNanoException {
-    TestAllTypesNano testAllTypesNano = new TestAllTypesNano();
-    final String fullString = fullString(c, length);
-    testAllTypesNano.optionalString = fullString;
-    final TestAllTypesNano resultNano = new TestAllTypesNano();
-    MessageNano.mergeFrom(resultNano, MessageNano.toByteArray(testAllTypesNano));
-    assertEquals(fullString, resultNano.optionalString);
-  }
-
-  private String fullString(char c, int length) {
-    char[] result = new char[length];
-    Arrays.fill(result, c);
-    return new String(result);
-  }
-
-  public void testNanoWithHasParseFrom() throws Exception {
-    TestAllTypesNanoHas msg = null;
-    // Test false on creation, after clear and upon empty parse.
-    for (int i = 0; i < 3; i++) {
-      if (i == 0) {
-        msg = new TestAllTypesNanoHas();
-      } else if (i == 1) {
-        msg.clear();
-      } else if (i == 2) {
-        msg = TestAllTypesNanoHas.parseFrom(new byte[0]);
-      }
-      assertFalse(msg.hasOptionalInt32);
-      assertFalse(msg.hasOptionalString);
-      assertFalse(msg.hasOptionalBytes);
-      assertFalse(msg.hasOptionalNestedEnum);
-      assertFalse(msg.hasDefaultInt32);
-      assertFalse(msg.hasDefaultString);
-      assertFalse(msg.hasDefaultBytes);
-      assertFalse(msg.hasDefaultFloatNan);
-      assertFalse(msg.hasDefaultNestedEnum);
-      assertFalse(msg.hasId);
-      assertFalse(msg.hasRequiredEnum);
-      msg.optionalInt32 = 123;
-      msg.optionalNestedMessage = new TestAllTypesNanoHas.NestedMessage();
-      msg.optionalNestedMessage.bb = 2;
-      msg.optionalNestedEnum = TestAllTypesNano.BAZ;
-    }
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 10);
-    assertEquals(result.length, msgSerializedSize);
-
-    // Has fields true upon parse.
-    TestAllTypesNanoHas newMsg = TestAllTypesNanoHas.parseFrom(result);
-    assertEquals(123, newMsg.optionalInt32);
-    assertTrue(newMsg.hasOptionalInt32);
-    assertEquals(2, newMsg.optionalNestedMessage.bb);
-    assertTrue(newMsg.optionalNestedMessage.hasBb);
-    assertEquals(TestAllTypesNanoHas.BAZ, newMsg.optionalNestedEnum);
-    assertTrue(newMsg.hasOptionalNestedEnum);
-  }
-
-  public void testNanoWithHasSerialize() throws Exception {
-    TestAllTypesNanoHas msg = new TestAllTypesNanoHas();
-    msg.hasOptionalInt32 = true;
-    msg.hasOptionalString = true;
-    msg.hasOptionalBytes = true;
-    msg.optionalNestedMessage = new TestAllTypesNanoHas.NestedMessage();
-    msg.optionalNestedMessage.hasBb = true;
-    msg.hasOptionalNestedEnum = true;
-    msg.hasDefaultInt32 = true;
-    msg.hasDefaultString = true;
-    msg.hasDefaultBytes = true;
-    msg.hasDefaultFloatNan = true;
-    msg.hasDefaultNestedEnum = true;
-    msg.hasId = true;
-    msg.hasRequiredEnum = true;
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    assertEquals(result.length, msgSerializedSize);
-
-    // Now deserialize and find that all fields are set and equal to their defaults.
-    TestAllTypesNanoHas newMsg = TestAllTypesNanoHas.parseFrom(result);
-    assertTrue(newMsg.hasOptionalInt32);
-    assertTrue(newMsg.hasOptionalString);
-    assertTrue(newMsg.hasOptionalBytes);
-    assertTrue(newMsg.optionalNestedMessage.hasBb);
-    assertTrue(newMsg.hasOptionalNestedEnum);
-    assertTrue(newMsg.hasDefaultInt32);
-    assertTrue(newMsg.hasDefaultString);
-    assertTrue(newMsg.hasDefaultBytes);
-    assertTrue(newMsg.hasDefaultFloatNan);
-    assertTrue(newMsg.hasDefaultNestedEnum);
-    assertTrue(newMsg.hasId);
-    assertTrue(newMsg.hasRequiredEnum);
-    assertEquals(0, newMsg.optionalInt32);
-    assertEquals(0, newMsg.optionalString.length());
-    assertEquals(0, newMsg.optionalBytes.length);
-    assertEquals(0, newMsg.optionalNestedMessage.bb);
-    assertEquals(TestAllTypesNanoHas.FOO, newMsg.optionalNestedEnum);
-    assertEquals(41, newMsg.defaultInt32);
-    assertEquals("hello", newMsg.defaultString);
-    assertEquals("world", new String(newMsg.defaultBytes, InternalNano.UTF_8));
-    assertEquals(TestAllTypesNanoHas.BAR, newMsg.defaultNestedEnum);
-    assertEquals(Float.NaN, newMsg.defaultFloatNan);
-    assertEquals(0, newMsg.id);
-    assertEquals(TestAllTypesNanoHas.FOO, newMsg.requiredEnum);
-  }
-
-  public void testNanoWithAccessorsBasic() throws Exception {
-    TestNanoAccessors msg = new TestNanoAccessors();
-
-    // Makes sure required, repeated, and message fields are still public
-    msg.id = 3;
-    msg.repeatedBytes = new byte[2][3];
-    msg.optionalNestedMessage = null;
-
-    // Test accessors
-    assertEquals(0, msg.getOptionalInt32());
-    assertFalse(msg.hasOptionalInt32());
-    msg.setOptionalInt32(135);
-    assertEquals(135, msg.getOptionalInt32());
-    assertTrue(msg.hasOptionalInt32());
-    msg.clearOptionalInt32();
-    assertFalse(msg.hasOptionalInt32());
-    msg.setOptionalInt32(0); // default value
-    assertTrue(msg.hasOptionalInt32());
-
-    // Test NPE
-    try {
-      msg.setOptionalBytes(null);
-      fail();
-    } catch (NullPointerException expected) {}
-    try {
-      msg.setOptionalString(null);
-      fail();
-    } catch (NullPointerException expected) {}
-
-    // Test has bit on bytes field with defaults and clear() re-clones the default array
-    assertFalse(msg.hasDefaultBytes());
-    byte[] defaultBytes = msg.getDefaultBytes();
-    msg.setDefaultBytes(defaultBytes);
-    assertTrue(msg.hasDefaultBytes());
-    msg.clearDefaultBytes();
-    assertFalse(msg.hasDefaultBytes());
-    defaultBytes[0]++; // modify original array
-    assertFalse(Arrays.equals(defaultBytes, msg.getDefaultBytes()));
-
-    // Test has bits that require additional bit fields
-    assertFalse(msg.hasBitFieldCheck());
-    msg.setBitFieldCheck(0);
-    assertTrue(msg.hasBitFieldCheck());
-    assertFalse(msg.hasBeforeBitFieldCheck()); // checks bit field does not leak
-    assertFalse(msg.hasAfterBitFieldCheck());
-
-    // Test clear() clears has bits
-    msg.setOptionalString("hi");
-    msg.setDefaultString("there");
-    msg.clear();
-    assertFalse(msg.hasOptionalString());
-    assertFalse(msg.hasDefaultString());
-    assertFalse(msg.hasBitFieldCheck());
-
-    // Test set() and clear() returns itself (compiles = success)
-    msg.clear()
-        .setOptionalInt32(3)
-        .clearDefaultBytes()
-        .setOptionalString("4");
-  }
-
-  public void testNanoWithAccessorsParseFrom() throws Exception {
-    TestNanoAccessors msg = null;
-    // Test false on creation, after clear and upon empty parse.
-    for (int i = 0; i < 3; i++) {
-      if (i == 0) {
-        msg = new TestNanoAccessors();
-      } else if (i == 1) {
-        msg.clear();
-      } else if (i == 2) {
-        msg = TestNanoAccessors.parseFrom(new byte[0]);
-      }
-      assertFalse(msg.hasOptionalInt32());
-      assertFalse(msg.hasOptionalString());
-      assertFalse(msg.hasOptionalBytes());
-      assertFalse(msg.hasOptionalNestedEnum());
-      assertFalse(msg.hasDefaultInt32());
-      assertFalse(msg.hasDefaultString());
-      assertFalse(msg.hasDefaultBytes());
-      assertFalse(msg.hasDefaultFloatNan());
-      assertFalse(msg.hasDefaultNestedEnum());
-      msg.optionalNestedMessage = new TestNanoAccessors.NestedMessage();
-      msg.optionalNestedMessage.setBb(2);
-      msg.setOptionalNestedEnum(TestNanoAccessors.BAZ);
-      msg.setDefaultInt32(msg.getDefaultInt32());
-    }
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    //System.out.printf("mss=%d result.length=%d\n", msgSerializedSize, result.length);
-    assertTrue(msgSerializedSize == 14);
-    assertEquals(result.length, msgSerializedSize);
-
-    // Has fields true upon parse.
-    TestNanoAccessors newMsg = TestNanoAccessors.parseFrom(result);
-    assertEquals(2, newMsg.optionalNestedMessage.getBb());
-    assertTrue(newMsg.optionalNestedMessage.hasBb());
-    assertEquals(TestNanoAccessors.BAZ, newMsg.getOptionalNestedEnum());
-    assertTrue(newMsg.hasOptionalNestedEnum());
-
-    // Has field true on fields with explicit default values from wire.
-    assertTrue(newMsg.hasDefaultInt32());
-    assertEquals(41, newMsg.getDefaultInt32());
-  }
-
-  public void testNanoWithAccessorsPublicFieldTypes() throws Exception {
-    TestNanoAccessors msg = new TestNanoAccessors();
-    assertNull(msg.optionalNestedMessage);
-    assertEquals(0, msg.id);
-    assertEquals(0, msg.repeatedNestedEnum.length);
-
-    TestNanoAccessors newMsg = TestNanoAccessors.parseFrom(MessageNano.toByteArray(msg));
-    assertNull(newMsg.optionalNestedMessage);
-    assertEquals(0, newMsg.id);
-    assertEquals(0, newMsg.repeatedNestedEnum.length);
-
-    TestNanoAccessors.NestedMessage nestedMessage = new TestNanoAccessors.NestedMessage();
-    nestedMessage.setBb(5);
-    newMsg.optionalNestedMessage = nestedMessage;
-    newMsg.id = -1;
-    newMsg.repeatedNestedEnum = new int[] { TestAllTypesNano.FOO };
-
-    TestNanoAccessors newMsg2 = TestNanoAccessors.parseFrom(MessageNano.toByteArray(newMsg));
-    assertEquals(nestedMessage.getBb(), newMsg2.optionalNestedMessage.getBb());
-    assertEquals(-1, newMsg2.id);
-    assertEquals(TestAllTypesNano.FOO, newMsg2.repeatedNestedEnum[0]);
-
-    newMsg2.optionalNestedMessage = null;
-    newMsg2.id = 0;
-    newMsg2.repeatedNestedEnum = null;
-
-    TestNanoAccessors newMsg3 = TestNanoAccessors.parseFrom(MessageNano.toByteArray(newMsg2));
-    assertNull(newMsg3.optionalNestedMessage);
-    assertEquals(0, newMsg3.id);
-    assertEquals(0, newMsg3.repeatedNestedEnum.length);
-  }
-
-  public void testNanoWithAccessorsSerialize() throws Exception {
-    TestNanoAccessors msg = new TestNanoAccessors();
-    msg.setOptionalInt32(msg.getOptionalInt32());
-    msg.setOptionalString(msg.getOptionalString());
-    msg.setOptionalBytes(msg.getOptionalBytes());
-    TestNanoAccessors.NestedMessage nestedMessage = new TestNanoAccessors.NestedMessage();
-    nestedMessage.setBb(nestedMessage.getBb());
-    msg.optionalNestedMessage = nestedMessage;
-    msg.setOptionalNestedEnum(msg.getOptionalNestedEnum());
-    msg.setDefaultInt32(msg.getDefaultInt32());
-    msg.setDefaultString(msg.getDefaultString());
-    msg.setDefaultBytes(msg.getDefaultBytes());
-    msg.setDefaultFloatNan(msg.getDefaultFloatNan());
-    msg.setDefaultNestedEnum(msg.getDefaultNestedEnum());
-
-    byte [] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    assertEquals(result.length, msgSerializedSize);
-
-    // Now deserialize and find that all fields are set and equal to their defaults.
-    TestNanoAccessors newMsg = TestNanoAccessors.parseFrom(result);
-    assertTrue(newMsg.hasOptionalInt32());
-    assertTrue(newMsg.hasOptionalString());
-    assertTrue(newMsg.hasOptionalBytes());
-    assertTrue(newMsg.optionalNestedMessage.hasBb());
-    assertTrue(newMsg.hasOptionalNestedEnum());
-    assertTrue(newMsg.hasDefaultInt32());
-    assertTrue(newMsg.hasDefaultString());
-    assertTrue(newMsg.hasDefaultBytes());
-    assertTrue(newMsg.hasDefaultFloatNan());
-    assertTrue(newMsg.hasDefaultNestedEnum());
-    assertEquals(0, newMsg.getOptionalInt32());
-    assertEquals(0, newMsg.getOptionalString().length());
-    assertEquals(0, newMsg.getOptionalBytes().length);
-    assertEquals(0, newMsg.optionalNestedMessage.getBb());
-    assertEquals(TestNanoAccessors.FOO, newMsg.getOptionalNestedEnum());
-    assertEquals(41, newMsg.getDefaultInt32());
-    assertEquals("hello", newMsg.getDefaultString());
-    assertEquals("world", new String(newMsg.getDefaultBytes(), InternalNano.UTF_8));
-    assertEquals(TestNanoAccessors.BAR, newMsg.getDefaultNestedEnum());
-    assertEquals(Float.NaN, newMsg.getDefaultFloatNan());
-    assertEquals(0, newMsg.id);
-  }
-
-  public void testNanoJavaEnumStyle() throws Exception {
-    EnumClassNanos.EnumClassNano msg = new EnumClassNanos.EnumClassNano();
-    assertEquals(EnumClassNanos.FileScopeEnum.ONE, msg.one);
-    assertEquals(EnumClassNanos.EnumClassNano.MessageScopeEnum.TWO, msg.two);
-
-    EnumClassNanoMultiple msg2 = new EnumClassNanoMultiple();
-    assertEquals(FileScopeEnumMultiple.THREE, msg2.three);
-    assertEquals(EnumClassNanoMultiple.MessageScopeEnumMultiple.FOUR, msg2.four);
-  }
-
-  /**
-   * Tests that fields with a default value of NaN are not serialized when
-   * set to NaN. This is a special case as NaN != NaN, so normal equality
-   * checks don't work.
-   */
-  public void testNanoNotANumberDefaults() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.defaultDoubleNan = 0;
-    msg.defaultFloatNan = 0;
-    byte[] result = MessageNano.toByteArray(msg);
-    int msgSerializedSize = msg.getSerializedSize();
-    assertTrue(result.length == msgSerializedSize);
-    assertTrue(msgSerializedSize > 3);
-
-    msg.defaultDoubleNan = Double.NaN;
-    msg.defaultFloatNan = Float.NaN;
-    result = MessageNano.toByteArray(msg);
-    msgSerializedSize = msg.getSerializedSize();
-    assertEquals(3, result.length);
-    assertEquals(3, msgSerializedSize);
-  }
-
-  /**
-   * Test that a bug in skipRawBytes() has been fixed:  if the skip skips
-   * exactly up to a limit, this should not break things.
-   */
-  public void testSkipRawBytesBug() throws Exception {
-    byte[] rawBytes = new byte[] { 1, 2 };
-    CodedInputByteBufferNano input = CodedInputByteBufferNano.newInstance(rawBytes);
-
-    int limit = input.pushLimit(1);
-    input.skipRawBytes(1);
-    input.popLimit(limit);
-    assertEquals(2, input.readRawByte());
-  }
-
-  /**
-   * Test that a bug in skipRawBytes() has been fixed:  if the skip skips
-   * past the end of a buffer with a limit that has been set past the end of
-   * that buffer, this should not break things.
-   */
-  public void testSkipRawBytesPastEndOfBufferWithLimit() throws Exception {
-    byte[] rawBytes = new byte[] { 1, 2, 3, 4, 5 };
-    CodedInputByteBufferNano input = CodedInputByteBufferNano.newInstance(rawBytes);
-
-    int limit = input.pushLimit(4);
-    // In order to expose the bug we need to read at least one byte to prime the
-    // buffer inside the CodedInputStream.
-    assertEquals(1, input.readRawByte());
-    // Skip to the end of the limit.
-    input.skipRawBytes(3);
-    assertTrue(input.isAtEnd());
-    input.popLimit(limit);
-    assertEquals(5, input.readRawByte());
-  }
-
-  // Test a smattering of various proto types for printing
-  public void testMessageNanoPrinter() {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.optionalInt32 = 14;
-    msg.optionalFloat = 42.3f;
-    msg.optionalString = "String \"with' both quotes";
-    msg.optionalBytes = new byte[] {'"', '\0', 1, 8};
-    msg.optionalGroup = new TestAllTypesNano.OptionalGroup();
-    msg.optionalGroup.a = 15;
-    msg.repeatedInt64 = new long[2];
-    msg.repeatedInt64[0] = 1L;
-    msg.repeatedInt64[1] = -1L;
-    msg.repeatedBytes = new byte[2][];
-    msg.repeatedBytes[1] = new byte[] {'h', 'e', 'l', 'l', 'o'};
-    msg.repeatedGroup = new TestAllTypesNano.RepeatedGroup[2];
-    msg.repeatedGroup[0] = new TestAllTypesNano.RepeatedGroup();
-    msg.repeatedGroup[0].a = -27;
-    msg.repeatedGroup[1] = new TestAllTypesNano.RepeatedGroup();
-    msg.repeatedGroup[1].a = -72;
-    msg.optionalNestedMessage = new TestAllTypesNano.NestedMessage();
-    msg.optionalNestedMessage.bb = 7;
-    msg.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[2];
-    msg.repeatedNestedMessage[0] = new TestAllTypesNano.NestedMessage();
-    msg.repeatedNestedMessage[0].bb = 77;
-    msg.repeatedNestedMessage[1] = new TestAllTypesNano.NestedMessage();
-    msg.repeatedNestedMessage[1].bb = 88;
-    msg.optionalNestedEnum = TestAllTypesNano.BAZ;
-    msg.repeatedNestedEnum = new int[2];
-    msg.repeatedNestedEnum[0] = TestAllTypesNano.BAR;
-    msg.repeatedNestedEnum[1] = TestAllTypesNano.FOO;
-    msg.repeatedStringPiece = new String[] {null, "world"};
-    msg.setOneofString("hello");
-
-    String protoPrint = msg.toString();
-    assertTrue(protoPrint.contains("optional_int32: 14"));
-    assertTrue(protoPrint.contains("optional_float: 42.3"));
-    assertTrue(protoPrint.contains("optional_double: 0.0"));
-    assertTrue(protoPrint.contains("optional_string: \"String \\u0022with\\u0027 both quotes\""));
-    assertTrue(protoPrint.contains("optional_bytes: \"\\\"\\000\\001\\010\""));
-    assertTrue(protoPrint.contains("optional_group <\n  a: 15\n>"));
-
-    assertTrue(protoPrint.contains("repeated_int64: 1\nrepeated_int64: -1"));
-    assertFalse(protoPrint.contains("repeated_bytes: \"\"")); // null should be dropped
-    assertTrue(protoPrint.contains("repeated_bytes: \"hello\""));
-    assertTrue(protoPrint.contains("repeated_group <\n  a: -27\n>\n"
-            + "repeated_group <\n  a: -72\n>"));
-    assertTrue(protoPrint.contains("optional_nested_message <\n  bb: 7\n>"));
-    assertTrue(protoPrint.contains("repeated_nested_message <\n  bb: 77\n>\n"
-            + "repeated_nested_message <\n  bb: 88\n>"));
-    assertTrue(protoPrint.contains("optional_nested_enum: 3"));
-    assertTrue(protoPrint.contains("repeated_nested_enum: 2\nrepeated_nested_enum: 1"));
-    assertTrue(protoPrint.contains("default_int32: 41"));
-    assertTrue(protoPrint.contains("default_string: \"hello\""));
-    assertFalse(protoPrint.contains("repeated_string_piece: \"\""));  // null should be dropped
-    assertTrue(protoPrint.contains("repeated_string_piece: \"world\""));
-    assertTrue(protoPrint.contains("oneof_string: \"hello\""));
-  }
-
-  public void testMessageNanoPrinterAccessors() throws Exception {
-    TestNanoAccessors msg = new TestNanoAccessors();
-    msg.setOptionalInt32(13);
-    msg.setOptionalString("foo");
-    msg.setOptionalBytes(new byte[] {'"', '\0', 1, 8});
-    msg.optionalNestedMessage = new TestNanoAccessors.NestedMessage();
-    msg.optionalNestedMessage.setBb(7);
-    msg.setOptionalNestedEnum(TestNanoAccessors.BAZ);
-    msg.repeatedInt32 = new int[] { 1, -1 };
-    msg.repeatedString = new String[] { "Hello", "world" };
-    msg.repeatedBytes = new byte[2][];
-    msg.repeatedBytes[1] = new byte[] {'h', 'e', 'l', 'l', 'o'};
-    msg.repeatedNestedMessage = new TestNanoAccessors.NestedMessage[2];
-    msg.repeatedNestedMessage[0] = new TestNanoAccessors.NestedMessage();
-    msg.repeatedNestedMessage[0].setBb(5);
-    msg.repeatedNestedMessage[1] = new TestNanoAccessors.NestedMessage();
-    msg.repeatedNestedMessage[1].setBb(6);
-    msg.repeatedNestedEnum = new int[] { TestNanoAccessors.FOO, TestNanoAccessors.BAR };
-    msg.id = 33;
-
-    String protoPrint = msg.toString();
-    assertTrue(protoPrint.contains("optional_int32: 13"));
-    assertTrue(protoPrint.contains("optional_string: \"foo\""));
-    assertTrue(protoPrint.contains("optional_bytes: \"\\\"\\000\\001\\010\""));
-    assertTrue(protoPrint.contains("optional_nested_message <\n  bb: 7\n>"));
-    assertTrue(protoPrint.contains("optional_nested_enum: 3"));
-    assertTrue(protoPrint.contains("repeated_int32: 1\nrepeated_int32: -1"));
-    assertTrue(protoPrint.contains("repeated_string: \"Hello\"\nrepeated_string: \"world\""));
-    assertFalse(protoPrint.contains("repeated_bytes: \"\"")); // null should be dropped
-    assertTrue(protoPrint.contains("repeated_bytes: \"hello\""));
-    assertTrue(protoPrint.contains("repeated_nested_message <\n  bb: 5\n>\n"
-            + "repeated_nested_message <\n  bb: 6\n>"));
-    assertTrue(protoPrint.contains("repeated_nested_enum: 1\nrepeated_nested_enum: 2"));
-    assertTrue(protoPrint.contains("id: 33"));
-  }
-
-  public void testMessageNanoPrinterForMaps() throws Exception {
-    TestMap msg = new TestMap();
-    MessageValue msgValues[] = new MessageValue[] {
-      new MessageValue(), new MessageValue()
-    };
-    msgValues[0].value = 1;
-    msgValues[1].value = 2;
-    msg.int32ToBytesField = new HashMap<Integer, byte[]>();
-    msg.int32ToBytesField.put(1, new byte[] {'"', '\0'});
-    msg.int32ToBytesField.put(2, new byte[] {1, 8});
-    msg.stringToInt32Field = new HashMap<String, Integer>();
-    msg.stringToInt32Field.put("hello", 1);
-    msg.stringToInt32Field.put("world", 2);
-    msg.int32ToMessageField = new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    msg.int32ToMessageField.put(0, msgValues[0]);
-    msg.int32ToMessageField.put(1, msgValues[1]);
-    msg.int32ToEnumField = new HashMap<Integer, Integer>();
-    msg.int32ToEnumField.put(1, 2);
-    msg.int32ToEnumField.put(2, 3);
-    String protoPrint = msg.toString();
-
-    assertTrue(protoPrint.contains(
-        "int32_to_bytes_field <\n  key: 1\n  value: \"\\\"\\000\"\n>"));
-    assertTrue(protoPrint.contains(
-        "int32_to_bytes_field <\n  key: 2\n  value: \"\\001\\010\"\n>"));
-    assertTrue(protoPrint.contains(
-        "string_to_int32_field <\n  key: \"hello\"\n  value: 1\n>"));
-    assertTrue(protoPrint.contains(
-        "string_to_int32_field <\n  key: \"world\"\n  value: 2\n>"));
-    assertTrue(protoPrint.contains(
-        "int32_to_message_field <\n  key: 0\n  value <\n    value: 1\n"));
-    assertTrue(protoPrint.contains(
-        "int32_to_message_field <\n  key: 1\n  value <\n    value: 2\n"));
-    assertTrue(protoPrint.contains(
-        "int32_to_enum_field <\n  key: 1\n  value: 2\n>"));
-    assertTrue(protoPrint.contains(
-        "int32_to_enum_field <\n  key: 2\n  value: 3\n>"));
-  }
-
-  public void testExtensions() throws Exception {
-    Extensions.ExtendableMessage message = new Extensions.ExtendableMessage();
-    message.field = 5;
-    int[] int32s = {1, 2};
-    int[] uint32s = {3, 4};
-    int[] sint32s = {-5, -6};
-    long[] int64s = {7, 8};
-    long[] uint64s = {9, 10};
-    long[] sint64s = {-11, -12};
-    int[] fixed32s = {13, 14};
-    int[] sfixed32s = {-15, -16};
-    long[] fixed64s = {17, 18};
-    long[] sfixed64s = {-19, -20};
-    boolean[] bools = {true, false};
-    float[] floats = {2.1f, 2.2f};
-    double[] doubles = {2.3, 2.4};
-    int[] enums = {Extensions.SECOND_VALUE, Extensions.FIRST_VALUE};
-    String[] strings = {"vijfentwintig", "twenty-six"};
-    byte[][] bytess = {{2, 7}, {2, 8}};
-    AnotherMessage another1 = new AnotherMessage();
-    another1.string = "er shi jiu";
-    another1.value = false;
-    AnotherMessage another2 = new AnotherMessage();
-    another2.string = "trente";
-    another2.value = true;
-    AnotherMessage[] messages = {another1, another2};
-    RepeatedExtensions.RepeatedGroup group1 = new RepeatedExtensions.RepeatedGroup();
-    group1.a = 31;
-    RepeatedExtensions.RepeatedGroup group2 = new RepeatedExtensions.RepeatedGroup();
-    group2.a = 32;
-    RepeatedExtensions.RepeatedGroup[] groups = {group1, group2};
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedInt32));
-    message.setExtension(RepeatedExtensions.repeatedInt32, int32s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedInt32));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedUint32));
-    message.setExtension(RepeatedExtensions.repeatedUint32, uint32s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedUint32));
-    message.setExtension(RepeatedExtensions.repeatedSint32, sint32s);
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedInt64));
-    message.setExtension(RepeatedExtensions.repeatedInt64, int64s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedInt64));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedUint64));
-    message.setExtension(RepeatedExtensions.repeatedUint64, uint64s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedUint64));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedSint64));
-    message.setExtension(RepeatedExtensions.repeatedSint64, sint64s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedSint64));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedFixed32));
-    message.setExtension(RepeatedExtensions.repeatedFixed32, fixed32s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedFixed32));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedSfixed32));
-    message.setExtension(RepeatedExtensions.repeatedSfixed32, sfixed32s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedSfixed32));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedFixed64));
-    message.setExtension(RepeatedExtensions.repeatedFixed64, fixed64s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedFixed64));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedSfixed64));
-    message.setExtension(RepeatedExtensions.repeatedSfixed64, sfixed64s);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedSfixed64));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedBool));
-    message.setExtension(RepeatedExtensions.repeatedBool, bools);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedBool));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedFloat));
-    message.setExtension(RepeatedExtensions.repeatedFloat, floats);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedFloat));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedDouble));
-    message.setExtension(RepeatedExtensions.repeatedDouble, doubles);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedDouble));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedEnum));
-    message.setExtension(RepeatedExtensions.repeatedEnum, enums);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedEnum));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedString));
-    message.setExtension(RepeatedExtensions.repeatedString, strings);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedString));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedBytes));
-    message.setExtension(RepeatedExtensions.repeatedBytes, bytess);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedBytes));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedMessage));
-    message.setExtension(RepeatedExtensions.repeatedMessage, messages);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedMessage));
-    assertFalse(message.hasExtension(RepeatedExtensions.repeatedGroup));
-    message.setExtension(RepeatedExtensions.repeatedGroup, groups);
-    assertTrue(message.hasExtension(RepeatedExtensions.repeatedGroup));
-
-    byte[] data = MessageNano.toByteArray(message);
-    message = Extensions.ExtendableMessage.parseFrom(data);
-    assertEquals(5, message.field);
-
-    // Test reading back using SingularExtensions: the retrieved value should equal the last
-    // in each array.
-    assertEquals(int32s[1], (int) message.getExtension(SingularExtensions.someInt32));
-    assertEquals(uint32s[1], (int) message.getExtension(SingularExtensions.someUint32));
-    assertEquals(sint32s[1], (int) message.getExtension(SingularExtensions.someSint32));
-    assertEquals(int64s[1], (long) message.getExtension(SingularExtensions.someInt64));
-    assertEquals(uint64s[1], (long) message.getExtension(SingularExtensions.someUint64));
-    assertEquals(sint64s[1], (long) message.getExtension(SingularExtensions.someSint64));
-    assertEquals(fixed32s[1], (int) message.getExtension(SingularExtensions.someFixed32));
-    assertEquals(sfixed32s[1], (int) message.getExtension(SingularExtensions.someSfixed32));
-    assertEquals(fixed64s[1], (long) message.getExtension(SingularExtensions.someFixed64));
-    assertEquals(sfixed64s[1], (long) message.getExtension(SingularExtensions.someSfixed64));
-    assertEquals(bools[1], (boolean) message.getExtension(SingularExtensions.someBool));
-    assertEquals(floats[1], (float) message.getExtension(SingularExtensions.someFloat));
-    assertEquals(doubles[1], (double) message.getExtension(SingularExtensions.someDouble));
-    assertEquals(enums[1], (int) message.getExtension(SingularExtensions.someEnum));
-    assertEquals(strings[1], message.getExtension(SingularExtensions.someString));
-    assertTrue(Arrays.equals(bytess[1], message.getExtension(SingularExtensions.someBytes)));
-    AnotherMessage deserializedMessage = message.getExtension(SingularExtensions.someMessage);
-    assertEquals(another2.string, deserializedMessage.string);
-    assertEquals(another2.value, deserializedMessage.value);
-    assertEquals(group2.a, message.getExtension(SingularExtensions.someGroup).a);
-
-    // Test reading back using RepeatedExtensions: the arrays should be equal.
-    message = Extensions.ExtendableMessage.parseFrom(data);
-    assertEquals(5, message.field);
-    assertTrue(Arrays.equals(int32s, message.getExtension(RepeatedExtensions.repeatedInt32)));
-    assertTrue(Arrays.equals(uint32s, message.getExtension(RepeatedExtensions.repeatedUint32)));
-    assertTrue(Arrays.equals(sint32s, message.getExtension(RepeatedExtensions.repeatedSint32)));
-    assertTrue(Arrays.equals(int64s, message.getExtension(RepeatedExtensions.repeatedInt64)));
-    assertTrue(Arrays.equals(uint64s, message.getExtension(RepeatedExtensions.repeatedUint64)));
-    assertTrue(Arrays.equals(sint64s, message.getExtension(RepeatedExtensions.repeatedSint64)));
-    assertTrue(Arrays.equals(fixed32s, message.getExtension(RepeatedExtensions.repeatedFixed32)));
-    assertTrue(Arrays.equals(sfixed32s, message.getExtension(RepeatedExtensions.repeatedSfixed32)));
-    assertTrue(Arrays.equals(fixed64s, message.getExtension(RepeatedExtensions.repeatedFixed64)));
-    assertTrue(Arrays.equals(sfixed64s, message.getExtension(RepeatedExtensions.repeatedSfixed64)));
-    assertTrue(Arrays.equals(bools, message.getExtension(RepeatedExtensions.repeatedBool)));
-    assertTrue(Arrays.equals(floats, message.getExtension(RepeatedExtensions.repeatedFloat)));
-    assertTrue(Arrays.equals(doubles, message.getExtension(RepeatedExtensions.repeatedDouble)));
-    assertTrue(Arrays.equals(enums, message.getExtension(RepeatedExtensions.repeatedEnum)));
-    assertTrue(Arrays.equals(strings, message.getExtension(RepeatedExtensions.repeatedString)));
-    byte[][] deserializedRepeatedBytes = message.getExtension(RepeatedExtensions.repeatedBytes);
-    assertEquals(2, deserializedRepeatedBytes.length);
-    assertTrue(Arrays.equals(bytess[0], deserializedRepeatedBytes[0]));
-    assertTrue(Arrays.equals(bytess[1], deserializedRepeatedBytes[1]));
-    AnotherMessage[] deserializedRepeatedMessage =
-        message.getExtension(RepeatedExtensions.repeatedMessage);
-    assertEquals(2, deserializedRepeatedMessage.length);
-    assertEquals(another1.string, deserializedRepeatedMessage[0].string);
-    assertEquals(another1.value, deserializedRepeatedMessage[0].value);
-    assertEquals(another2.string, deserializedRepeatedMessage[1].string);
-    assertEquals(another2.value, deserializedRepeatedMessage[1].value);
-    RepeatedExtensions.RepeatedGroup[] deserializedRepeatedGroup =
-        message.getExtension(RepeatedExtensions.repeatedGroup);
-    assertEquals(2, deserializedRepeatedGroup.length);
-    assertEquals(group1.a, deserializedRepeatedGroup[0].a);
-    assertEquals(group2.a, deserializedRepeatedGroup[1].a);
-
-    message = Extensions.ExtendableMessage.parseFrom(data);
-    assertEquals(5, message.field);
-    // Test hasExtension using PackedExtensions.
-    assertTrue(message.hasExtension(PackedExtensions.packedInt32));
-    assertTrue(message.hasExtension(PackedExtensions.packedUint32));
-    assertTrue(message.hasExtension(PackedExtensions.packedSint32));
-    assertTrue(message.hasExtension(PackedExtensions.packedInt64));
-    assertTrue(message.hasExtension(PackedExtensions.packedUint64));
-    assertTrue(message.hasExtension(PackedExtensions.packedSint64));
-    assertTrue(message.hasExtension(PackedExtensions.packedFixed32));
-    assertTrue(message.hasExtension(PackedExtensions.packedSfixed32));
-    assertTrue(message.hasExtension(PackedExtensions.packedFixed64));
-    assertTrue(message.hasExtension(PackedExtensions.packedSfixed64));
-    assertTrue(message.hasExtension(PackedExtensions.packedBool));
-    assertTrue(message.hasExtension(PackedExtensions.packedFloat));
-    assertTrue(message.hasExtension(PackedExtensions.packedDouble));
-    assertTrue(message.hasExtension(PackedExtensions.packedEnum));
-
-    // Test reading back using PackedExtensions: the arrays should be equal, even the fields
-    // are non-packed.
-    assertTrue(Arrays.equals(int32s, message.getExtension(PackedExtensions.packedInt32)));
-    assertTrue(Arrays.equals(uint32s, message.getExtension(PackedExtensions.packedUint32)));
-    assertTrue(Arrays.equals(sint32s, message.getExtension(PackedExtensions.packedSint32)));
-    assertTrue(Arrays.equals(int64s, message.getExtension(PackedExtensions.packedInt64)));
-    assertTrue(Arrays.equals(uint64s, message.getExtension(PackedExtensions.packedUint64)));
-    assertTrue(Arrays.equals(sint64s, message.getExtension(PackedExtensions.packedSint64)));
-    assertTrue(Arrays.equals(fixed32s, message.getExtension(PackedExtensions.packedFixed32)));
-    assertTrue(Arrays.equals(sfixed32s, message.getExtension(PackedExtensions.packedSfixed32)));
-    assertTrue(Arrays.equals(fixed64s, message.getExtension(PackedExtensions.packedFixed64)));
-    assertTrue(Arrays.equals(sfixed64s, message.getExtension(PackedExtensions.packedSfixed64)));
-    assertTrue(Arrays.equals(bools, message.getExtension(PackedExtensions.packedBool)));
-    assertTrue(Arrays.equals(floats, message.getExtension(PackedExtensions.packedFloat)));
-    assertTrue(Arrays.equals(doubles, message.getExtension(PackedExtensions.packedDouble)));
-    assertTrue(Arrays.equals(enums, message.getExtension(PackedExtensions.packedEnum)));
-
-    // Now set the packable extension values using PackedExtensions so they're serialized packed.
-    message.setExtension(PackedExtensions.packedInt32, int32s);
-    message.setExtension(PackedExtensions.packedUint32, uint32s);
-    message.setExtension(PackedExtensions.packedSint32, sint32s);
-    message.setExtension(PackedExtensions.packedInt64, int64s);
-    message.setExtension(PackedExtensions.packedUint64, uint64s);
-    message.setExtension(PackedExtensions.packedSint64, sint64s);
-    message.setExtension(PackedExtensions.packedFixed32, fixed32s);
-    message.setExtension(PackedExtensions.packedSfixed32, sfixed32s);
-    message.setExtension(PackedExtensions.packedFixed64, fixed64s);
-    message.setExtension(PackedExtensions.packedSfixed64, sfixed64s);
-    message.setExtension(PackedExtensions.packedBool, bools);
-    message.setExtension(PackedExtensions.packedFloat, floats);
-    message.setExtension(PackedExtensions.packedDouble, doubles);
-    message.setExtension(PackedExtensions.packedEnum, enums);
-
-    // And read back using non-packed RepeatedExtensions.
-    byte[] data2 = MessageNano.toByteArray(message);
-    message = MessageNano.mergeFrom(new Extensions.ExtendableMessage(), data2);
-    assertTrue(Arrays.equals(int32s, message.getExtension(RepeatedExtensions.repeatedInt32)));
-    assertTrue(Arrays.equals(uint32s, message.getExtension(RepeatedExtensions.repeatedUint32)));
-    assertTrue(Arrays.equals(sint32s, message.getExtension(RepeatedExtensions.repeatedSint32)));
-    assertTrue(Arrays.equals(int64s, message.getExtension(RepeatedExtensions.repeatedInt64)));
-    assertTrue(Arrays.equals(uint64s, message.getExtension(RepeatedExtensions.repeatedUint64)));
-    assertTrue(Arrays.equals(sint64s, message.getExtension(RepeatedExtensions.repeatedSint64)));
-    assertTrue(Arrays.equals(fixed32s, message.getExtension(RepeatedExtensions.repeatedFixed32)));
-    assertTrue(Arrays.equals(sfixed32s, message.getExtension(RepeatedExtensions.repeatedSfixed32)));
-    assertTrue(Arrays.equals(fixed64s, message.getExtension(RepeatedExtensions.repeatedFixed64)));
-    assertTrue(Arrays.equals(sfixed64s, message.getExtension(RepeatedExtensions.repeatedSfixed64)));
-    assertTrue(Arrays.equals(bools, message.getExtension(RepeatedExtensions.repeatedBool)));
-    assertTrue(Arrays.equals(floats, message.getExtension(RepeatedExtensions.repeatedFloat)));
-    assertTrue(Arrays.equals(doubles, message.getExtension(RepeatedExtensions.repeatedDouble)));
-    assertTrue(Arrays.equals(enums, message.getExtension(RepeatedExtensions.repeatedEnum)));
-
-    // Clone the message and ensure it's still equal.
-    Extensions.ExtendableMessage clone = message.clone();
-    assertEquals(clone, message);
-  }
-
-  public void testNullExtensions() throws Exception {
-    // Check that clearing the extension on an empty message is a no-op.
-    Extensions.ExtendableMessage message = new Extensions.ExtendableMessage();
-    assertFalse(message.hasExtension(SingularExtensions.someMessage));
-    message.setExtension(SingularExtensions.someMessage, null);
-    assertFalse(message.hasExtension(SingularExtensions.someMessage));
-    assertEquals(0, MessageNano.toByteArray(message).length);
-
-    // Check that the message is empty after setting and clearing an extension.
-    AnotherMessage another = new AnotherMessage();
-    assertFalse(message.hasExtension(SingularExtensions.someMessage));
-    message.setExtension(SingularExtensions.someMessage, another);
-    assertTrue(message.hasExtension(SingularExtensions.someMessage));
-    assertTrue(MessageNano.toByteArray(message).length > 0);
-    message.setExtension(SingularExtensions.someMessage, null);
-    assertFalse(message.hasExtension(SingularExtensions.someMessage));
-    assertEquals(0, MessageNano.toByteArray(message).length);
-  }
-
-  public void testExtensionsMutation() {
-    Extensions.ExtendableMessage extendableMessage = new Extensions.ExtendableMessage();
-    extendableMessage.setExtension(SingularExtensions.someMessage,
-        new Extensions.AnotherMessage());
-
-    extendableMessage.getExtension(SingularExtensions.someMessage).string = "not empty";
-
-    assertEquals("not empty",
-        extendableMessage.getExtension(SingularExtensions.someMessage).string);
-  }
-
-  public void testExtensionsMutation_Equals() throws InvalidProtocolBufferNanoException {
-    Extensions.ExtendableMessage extendableMessage = new Extensions.ExtendableMessage();
-    extendableMessage.field = 5;
-    int int32 = 42;
-    int[] uint32s = {3, 4};
-    int[] sint32s = {-5, -6};
-    long[] int64s = {7, 8};
-    long[] uint64s = {9, 10};
-    long[] sint64s = {-11, -12};
-    int[] fixed32s = {13, 14};
-    int[] sfixed32s = {-15, -16};
-    long[] fixed64s = {17, 18};
-    long[] sfixed64s = {-19, -20};
-    boolean[] bools = {true, false};
-    float[] floats = {2.1f, 2.2f};
-    double[] doubles = {2.3, 2.4};
-    int[] enums = {Extensions.SECOND_VALUE, Extensions.FIRST_VALUE};
-    String[] strings = {"vijfentwintig", "twenty-six"};
-    byte[][] bytess = {{2, 7}, {2, 8}};
-    AnotherMessage another1 = new AnotherMessage();
-    another1.string = "er shi jiu";
-    another1.value = false;
-    AnotherMessage another2 = new AnotherMessage();
-    another2.string = "trente";
-    another2.value = true;
-    AnotherMessage[] messages = {another1, another2};
-    RepeatedExtensions.RepeatedGroup group1 = new RepeatedExtensions.RepeatedGroup();
-    group1.a = 31;
-    RepeatedExtensions.RepeatedGroup group2 = new RepeatedExtensions.RepeatedGroup();
-    group2.a = 32;
-    RepeatedExtensions.RepeatedGroup[] groups = {group1, group2};
-    extendableMessage.setExtension(SingularExtensions.someInt32, int32);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedUint32, uint32s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedSint32, sint32s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedInt64, int64s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedUint64, uint64s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedSint64, sint64s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedFixed32, fixed32s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedSfixed32, sfixed32s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedFixed64, fixed64s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedSfixed64, sfixed64s);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedBool, bools);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedFloat, floats);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedDouble, doubles);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedEnum, enums);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedString, strings);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedBytes, bytess);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedMessage, messages);
-    extendableMessage.setExtension(RepeatedExtensions.repeatedGroup, groups);
-
-    byte[] data = MessageNano.toByteArray(extendableMessage);
-
-    extendableMessage = Extensions.ExtendableMessage.parseFrom(data);
-    Extensions.ExtendableMessage messageCopy = Extensions.ExtendableMessage.parseFrom(data);
-
-    // Without deserialising.
-    assertEquals(extendableMessage, messageCopy);
-    assertEquals(extendableMessage.hashCode(), messageCopy.hashCode());
-
-    // Only one deserialized.
-    extendableMessage.getExtension(SingularExtensions.someInt32);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedUint32);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedSint32);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedInt64);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedUint64);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedSint64);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedFixed32);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedSfixed32);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedFixed64);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedSfixed64);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedBool);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedFloat);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedDouble);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedEnum);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedString);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedBytes);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedMessage);
-    extendableMessage.getExtension(RepeatedExtensions.repeatedGroup);
-    assertEquals(extendableMessage, messageCopy);
-    assertEquals(extendableMessage.hashCode(), messageCopy.hashCode());
-
-    // Both deserialized.
-    messageCopy.getExtension(SingularExtensions.someInt32);
-    messageCopy.getExtension(RepeatedExtensions.repeatedUint32);
-    messageCopy.getExtension(RepeatedExtensions.repeatedSint32);
-    messageCopy.getExtension(RepeatedExtensions.repeatedInt64);
-    messageCopy.getExtension(RepeatedExtensions.repeatedUint64);
-    messageCopy.getExtension(RepeatedExtensions.repeatedSint64);
-    messageCopy.getExtension(RepeatedExtensions.repeatedFixed32);
-    messageCopy.getExtension(RepeatedExtensions.repeatedSfixed32);
-    messageCopy.getExtension(RepeatedExtensions.repeatedFixed64);
-    messageCopy.getExtension(RepeatedExtensions.repeatedSfixed64);
-    messageCopy.getExtension(RepeatedExtensions.repeatedBool);
-    messageCopy.getExtension(RepeatedExtensions.repeatedFloat);
-    messageCopy.getExtension(RepeatedExtensions.repeatedDouble);
-    messageCopy.getExtension(RepeatedExtensions.repeatedEnum);
-    messageCopy.getExtension(RepeatedExtensions.repeatedString);
-    messageCopy.getExtension(RepeatedExtensions.repeatedBytes);
-    messageCopy.getExtension(RepeatedExtensions.repeatedMessage);
-    messageCopy.getExtension(RepeatedExtensions.repeatedGroup);
-    assertEquals(extendableMessage, messageCopy);
-    assertEquals(extendableMessage.hashCode(), messageCopy.hashCode());
-
-    // Change one, make sure they are still different.
-    messageCopy.getExtension(RepeatedExtensions.repeatedMessage)[0].string = "not empty";
-    assertFalse(extendableMessage.equals(messageCopy));
-
-    // Even if the extension hasn't been deserialized.
-    extendableMessage = Extensions.ExtendableMessage.parseFrom(data);
-    assertFalse(extendableMessage.equals(messageCopy));
-  }
-
-  public void testExtensionsCaching() {
-    Extensions.ExtendableMessage extendableMessage = new Extensions.ExtendableMessage();
-    extendableMessage.setExtension(SingularExtensions.someMessage,
-        new Extensions.AnotherMessage());
-    assertSame("Consecutive calls to getExtensions should return the same object",
-        extendableMessage.getExtension(SingularExtensions.someMessage),
-        extendableMessage.getExtension(SingularExtensions.someMessage));
-  }
-
-  public void testUnknownFields() throws Exception {
-    // Check that we roundtrip (serialize and deserialize) unrecognized fields.
-    AnotherMessage message = new AnotherMessage();
-    message.string = "Hello World";
-    message.value = false;
-
-    byte[] bytes = MessageNano.toByteArray(message);
-    int extraFieldSize = CodedOutputByteBufferNano.computeStringSize(
-        1001, "This is an unknown field");
-    byte[] newBytes = new byte[bytes.length + extraFieldSize];
-    System.arraycopy(bytes, 0, newBytes, 0, bytes.length);
-    CodedOutputByteBufferNano.newInstance(newBytes, bytes.length, extraFieldSize)
-        .writeString(1001, "This is an unknown field");
-
-    // Deserialize with an unknown field.
-    AnotherMessage deserialized = AnotherMessage.parseFrom(newBytes);
-    byte[] serialized = MessageNano.toByteArray(deserialized);
-
-    assertEquals(newBytes.length, serialized.length);
-
-    // Clear, and make sure it clears everything.
-    deserialized.clear();
-    assertEquals(0, MessageNano.toByteArray(deserialized).length);
-  }
-
-  public void testMergeFrom() throws Exception {
-    SimpleMessageNano message = new SimpleMessageNano();
-    message.d = 123;
-    byte[] bytes = MessageNano.toByteArray(message);
-
-    SimpleMessageNano newMessage = MessageNano.mergeFrom(new SimpleMessageNano(), bytes);
-    assertEquals(message.d, newMessage.d);
-  }
-
-  public void testJavaKeyword() throws Exception {
-    TestAllTypesNano msg = new TestAllTypesNano();
-    msg.synchronized_ = 123;
-    assertEquals(123, msg.synchronized_);
-  }
-
-  public void testReferenceTypesForPrimitives() throws Exception {
-    NanoReferenceTypes.TestAllTypesNano message = new NanoReferenceTypes.TestAllTypesNano();
-
-    // Base check - when nothing is set, we serialize nothing.
-    assertHasWireData(message, false);
-
-    message.defaultBool = true;
-    assertHasWireData(message, true);
-
-    message.defaultBool = false;
-    assertHasWireData(message, true);
-
-    message.defaultBool = null;
-    assertHasWireData(message, false);
-
-    message.defaultInt32 = 5;
-    assertHasWireData(message, true);
-
-    message.defaultInt32 = null;
-    assertHasWireData(message, false);
-
-    message.defaultInt64 = 123456L;
-    assertHasWireData(message, true);
-
-    message.defaultInt64 = null;
-    assertHasWireData(message, false);
-
-    message.defaultFloat = 1f;
-    assertHasWireData(message, true);
-
-    message.defaultFloat = null;
-    assertHasWireData(message, false);
-
-    message.defaultDouble = 2.1;
-    assertHasWireData(message, true);
-
-    message.defaultDouble = null;
-    assertHasWireData(message, false);
-
-    message.defaultString = "hello";
-    assertHasWireData(message, true);
-
-    message.defaultString = null;
-    assertHasWireData(message, false);
-
-    message.defaultBytes = new byte[] { 1, 2, 3 };
-    assertHasWireData(message, true);
-
-    message.defaultBytes = null;
-    assertHasWireData(message, false);
-  }
-
-  public void testHashCodeEquals() throws Exception {
-    // Complete equality:
-    TestAllTypesNano a = createMessageForHashCodeEqualsTest();
-    TestAllTypesNano aEquivalent = createMessageForHashCodeEqualsTest();
-
-    assertTrue(MessageNano.messageNanoEquals(a, aEquivalent));
-    assertFalse(MessageNano.messageNanoEquals(a, new TestAllTypesNano()));
-
-    // Null and empty array for repeated fields equality:
-    TestAllTypesNano b = createMessageForHashCodeEqualsTest();
-    b.repeatedBool = null;
-    b.repeatedFloat = new float[0];
-    TestAllTypesNano bEquivalent = createMessageForHashCodeEqualsTest();
-    bEquivalent.repeatedBool = new boolean[0];
-    bEquivalent.repeatedFloat = null;
-
-    // Ref-element-type repeated fields use non-null subsequence equality:
-    TestAllTypesNano c = createMessageForHashCodeEqualsTest();
-    c.repeatedString = null;
-    c.repeatedStringPiece = new String[] {null, "one", null, "two"};
-    c.repeatedBytes = new byte[][] {{3, 4}, null};
-    TestAllTypesNano cEquivalent = createMessageForHashCodeEqualsTest();
-    cEquivalent.repeatedString = new String[3];
-    cEquivalent.repeatedStringPiece = new String[] {"one", "two", null};
-    cEquivalent.repeatedBytes = new byte[][] {{3, 4}};
-
-    // Complete equality for messages with has fields:
-    TestAllTypesNanoHas d = createMessageWithHasForHashCodeEqualsTest();
-    TestAllTypesNanoHas dEquivalent = createMessageWithHasForHashCodeEqualsTest();
-
-    // If has-fields exist, fields with the same default values but
-    // different has-field values are different.
-    TestAllTypesNanoHas e = createMessageWithHasForHashCodeEqualsTest();
-    e.optionalInt32++; // make different from d
-    e.hasDefaultString = false;
-    TestAllTypesNanoHas eDifferent = createMessageWithHasForHashCodeEqualsTest();
-    eDifferent.optionalInt32 = e.optionalInt32;
-    eDifferent.hasDefaultString = true;
-
-    // Complete equality for messages with accessors:
-    TestNanoAccessors f = createMessageWithAccessorsForHashCodeEqualsTest();
-    TestNanoAccessors fEquivalent = createMessageWithAccessorsForHashCodeEqualsTest();
-
-    // If using accessors, explicitly setting a field to its default value
-    // should make the message different.
-    TestNanoAccessors g = createMessageWithAccessorsForHashCodeEqualsTest();
-    g.setOptionalInt32(g.getOptionalInt32() + 1); // make different from f
-    g.clearDefaultString();
-    TestNanoAccessors gDifferent = createMessageWithAccessorsForHashCodeEqualsTest();
-    gDifferent.setOptionalInt32(g.getOptionalInt32());
-    gDifferent.setDefaultString(g.getDefaultString());
-
-    // Complete equality for reference typed messages:
-    NanoReferenceTypes.TestAllTypesNano h = createRefTypedMessageForHashCodeEqualsTest();
-    NanoReferenceTypes.TestAllTypesNano hEquivalent = createRefTypedMessageForHashCodeEqualsTest();
-
-    // Inequality of null and default value for reference typed messages:
-    NanoReferenceTypes.TestAllTypesNano i = createRefTypedMessageForHashCodeEqualsTest();
-    i.optionalInt32 = 1; // make different from h
-    i.optionalFloat = null;
-    NanoReferenceTypes.TestAllTypesNano iDifferent = createRefTypedMessageForHashCodeEqualsTest();
-    iDifferent.optionalInt32 = i.optionalInt32;
-    iDifferent.optionalFloat = 0.0f;
-
-    HashMap<MessageNano, String> hashMap = new HashMap<MessageNano, String>();
-    hashMap.put(a, "a");
-    hashMap.put(b, "b");
-    hashMap.put(c, "c");
-    hashMap.put(d, "d");
-    hashMap.put(e, "e");
-    hashMap.put(f, "f");
-    hashMap.put(g, "g");
-    hashMap.put(h, "h");
-    hashMap.put(i, "i");
-
-    assertEquals(9, hashMap.size()); // a-i should be different from each other.
-
-    assertEquals("a", hashMap.get(a));
-    assertEquals("a", hashMap.get(aEquivalent));
-
-    assertEquals("b", hashMap.get(b));
-    assertEquals("b", hashMap.get(bEquivalent));
-
-    assertEquals("c", hashMap.get(c));
-    assertEquals("c", hashMap.get(cEquivalent));
-
-    assertEquals("d", hashMap.get(d));
-    assertEquals("d", hashMap.get(dEquivalent));
-
-    assertEquals("e", hashMap.get(e));
-    assertNull(hashMap.get(eDifferent));
-
-    assertEquals("f", hashMap.get(f));
-    assertEquals("f", hashMap.get(fEquivalent));
-
-    assertEquals("g", hashMap.get(g));
-    assertNull(hashMap.get(gDifferent));
-
-    assertEquals("h", hashMap.get(h));
-    assertEquals("h", hashMap.get(hEquivalent));
-
-    assertEquals("i", hashMap.get(i));
-    assertNull(hashMap.get(iDifferent));
-  }
-
-  private TestAllTypesNano createMessageForHashCodeEqualsTest() {
-    TestAllTypesNano message = new TestAllTypesNano();
-    message.optionalInt32 = 5;
-    message.optionalInt64 = 777;
-    message.optionalFloat = 1.0f;
-    message.optionalDouble = 2.0;
-    message.optionalBool = true;
-    message.optionalString = "Hello";
-    message.optionalBytes = new byte[] { 1, 2, 3 };
-    message.optionalNestedMessage = new TestAllTypesNano.NestedMessage();
-    message.optionalNestedMessage.bb = 27;
-    message.optionalNestedEnum = TestAllTypesNano.BAR;
-    message.repeatedInt32 = new int[] { 5, 6, 7, 8 };
-    message.repeatedInt64 = new long[] { 27L, 28L, 29L };
-    message.repeatedFloat = new float[] { 5.0f, 6.0f };
-    message.repeatedDouble = new double[] { 99.1, 22.5 };
-    message.repeatedBool = new boolean[] { true, false, true };
-    message.repeatedString = new String[] { "One", "Two" };
-    message.repeatedBytes = new byte[][] { { 2, 7 }, { 2, 7 } };
-    message.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] {
-      message.optionalNestedMessage,
-      message.optionalNestedMessage
-    };
-    message.repeatedNestedEnum = new int[] {
-      TestAllTypesNano.BAR,
-      TestAllTypesNano.BAZ
-    };
-    message.setOneofUint32(3);
-    return message;
-  }
-
-  private TestAllTypesNanoHas createMessageWithHasForHashCodeEqualsTest() {
-    TestAllTypesNanoHas message = new TestAllTypesNanoHas();
-    message.optionalInt32 = 5;
-    message.optionalString = "Hello";
-    message.optionalBytes = new byte[] { 1, 2, 3 };
-    message.optionalNestedMessage = new TestAllTypesNanoHas.NestedMessage();
-    message.optionalNestedMessage.bb = 27;
-    message.optionalNestedEnum = TestAllTypesNano.BAR;
-    message.repeatedInt32 = new int[] { 5, 6, 7, 8 };
-    message.repeatedString = new String[] { "One", "Two" };
-    message.repeatedBytes = new byte[][] { { 2, 7 }, { 2, 7 } };
-    message.repeatedNestedMessage = new TestAllTypesNanoHas.NestedMessage[] {
-      message.optionalNestedMessage,
-      message.optionalNestedMessage
-    };
-    message.repeatedNestedEnum = new int[] {
-      TestAllTypesNano.BAR,
-      TestAllTypesNano.BAZ
-    };
-    return message;
-  }
-
-  private TestNanoAccessors createMessageWithAccessorsForHashCodeEqualsTest() {
-    TestNanoAccessors message = new TestNanoAccessors()
-        .setOptionalInt32(5)
-        .setOptionalString("Hello")
-        .setOptionalBytes(new byte[] {1, 2, 3})
-        .setOptionalNestedEnum(TestNanoAccessors.BAR);
-    message.optionalNestedMessage = new TestNanoAccessors.NestedMessage().setBb(27);
-    message.repeatedInt32 = new int[] { 5, 6, 7, 8 };
-    message.repeatedString = new String[] { "One", "Two" };
-    message.repeatedBytes = new byte[][] { { 2, 7 }, { 2, 7 } };
-    message.repeatedNestedMessage = new TestNanoAccessors.NestedMessage[] {
-      message.optionalNestedMessage,
-      message.optionalNestedMessage
-    };
-    message.repeatedNestedEnum = new int[] {
-      TestAllTypesNano.BAR,
-      TestAllTypesNano.BAZ
-    };
-    return message;
-  }
-
-  private NanoReferenceTypes.TestAllTypesNano createRefTypedMessageForHashCodeEqualsTest() {
-    NanoReferenceTypes.TestAllTypesNano message = new NanoReferenceTypes.TestAllTypesNano();
-    message.optionalInt32 = 5;
-    message.optionalInt64 = 777L;
-    message.optionalFloat = 1.0f;
-    message.optionalDouble = 2.0;
-    message.optionalBool = true;
-    message.optionalString = "Hello";
-    message.optionalBytes = new byte[] { 1, 2, 3 };
-    message.optionalNestedMessage =
-        new NanoReferenceTypes.TestAllTypesNano.NestedMessage();
-    message.optionalNestedMessage.foo = 27;
-    message.optionalNestedEnum = NanoReferenceTypes.TestAllTypesNano.BAR;
-    message.repeatedInt32 = new int[] { 5, 6, 7, 8 };
-    message.repeatedInt64 = new long[] { 27L, 28L, 29L };
-    message.repeatedFloat = new float[] { 5.0f, 6.0f };
-    message.repeatedDouble = new double[] { 99.1, 22.5 };
-    message.repeatedBool = new boolean[] { true, false, true };
-    message.repeatedString = new String[] { "One", "Two" };
-    message.repeatedBytes = new byte[][] { { 2, 7 }, { 2, 7 } };
-    message.repeatedNestedMessage =
-        new NanoReferenceTypes.TestAllTypesNano.NestedMessage[] {
-          message.optionalNestedMessage,
-          message.optionalNestedMessage
-        };
-    message.repeatedNestedEnum = new int[] {
-      NanoReferenceTypes.TestAllTypesNano.BAR,
-      NanoReferenceTypes.TestAllTypesNano.BAZ
-    };
-    return message;
-  }
-
-  public void testEqualsWithSpecialFloatingPointValues() throws Exception {
-    // Checks that the nano implementation complies with Object.equals() when treating
-    // floating point numbers, i.e. NaN == NaN and +0.0 != -0.0.
-    // This test assumes that the generated equals() implementations are symmetric, so
-    // there will only be one direction for each equality check.
-
-    TestAllTypesNano m1 = new TestAllTypesNano();
-    m1.optionalFloat = Float.NaN;
-    m1.optionalDouble = Double.NaN;
-    TestAllTypesNano m2 = new TestAllTypesNano();
-    m2.optionalFloat = Float.NaN;
-    m2.optionalDouble = Double.NaN;
-    assertTrue(m1.equals(m2));
-    assertTrue(m1.equals(
-        MessageNano.mergeFrom(new TestAllTypesNano(), MessageNano.toByteArray(m1))));
-
-    m1.optionalFloat = +0f;
-    m2.optionalFloat = -0f;
-    assertFalse(m1.equals(m2));
-
-    m1.optionalFloat = -0f;
-    m1.optionalDouble = +0d;
-    m2.optionalDouble = -0d;
-    assertFalse(m1.equals(m2));
-
-    m1.optionalDouble = -0d;
-    assertTrue(m1.equals(m2));
-    assertFalse(m1.equals(new TestAllTypesNano())); // -0 does not equals() the default +0
-    assertTrue(m1.equals(
-        MessageNano.mergeFrom(new TestAllTypesNano(), MessageNano.toByteArray(m1))));
-
-    // -------
-
-    TestAllTypesNanoHas m3 = new TestAllTypesNanoHas();
-    m3.optionalFloat = Float.NaN;
-    m3.hasOptionalFloat = true;
-    m3.optionalDouble = Double.NaN;
-    m3.hasOptionalDouble = true;
-    TestAllTypesNanoHas m4 = new TestAllTypesNanoHas();
-    m4.optionalFloat = Float.NaN;
-    m4.hasOptionalFloat = true;
-    m4.optionalDouble = Double.NaN;
-    m4.hasOptionalDouble = true;
-    assertTrue(m3.equals(m4));
-    assertTrue(m3.equals(
-        MessageNano.mergeFrom(new TestAllTypesNanoHas(), MessageNano.toByteArray(m3))));
-
-    m3.optionalFloat = +0f;
-    m4.optionalFloat = -0f;
-    assertFalse(m3.equals(m4));
-
-    m3.optionalFloat = -0f;
-    m3.optionalDouble = +0d;
-    m4.optionalDouble = -0d;
-    assertFalse(m3.equals(m4));
-
-    m3.optionalDouble = -0d;
-    m3.hasOptionalFloat = false;  // -0 does not equals() the default +0,
-    m3.hasOptionalDouble = false; // so these incorrect 'has' flags should be disregarded.
-    assertTrue(m3.equals(m4));    // note: m4 has the 'has' flags set.
-    assertFalse(m3.equals(new TestAllTypesNanoHas())); // note: the new message has +0 defaults
-    assertTrue(m3.equals(
-        MessageNano.mergeFrom(new TestAllTypesNanoHas(), MessageNano.toByteArray(m3))));
-                                  // note: the deserialized message has the 'has' flags set.
-
-    // -------
-
-    TestNanoAccessors m5 = new TestNanoAccessors();
-    m5.setOptionalFloat(Float.NaN);
-    m5.setOptionalDouble(Double.NaN);
-    TestNanoAccessors m6 = new TestNanoAccessors();
-    m6.setOptionalFloat(Float.NaN);
-    m6.setOptionalDouble(Double.NaN);
-    assertTrue(m5.equals(m6));
-    assertTrue(m5.equals(
-        MessageNano.mergeFrom(new TestNanoAccessors(), MessageNano.toByteArray(m6))));
-
-    m5.setOptionalFloat(+0f);
-    m6.setOptionalFloat(-0f);
-    assertFalse(m5.equals(m6));
-
-    m5.setOptionalFloat(-0f);
-    m5.setOptionalDouble(+0d);
-    m6.setOptionalDouble(-0d);
-    assertFalse(m5.equals(m6));
-
-    m5.setOptionalDouble(-0d);
-    assertTrue(m5.equals(m6));
-    assertFalse(m5.equals(new TestNanoAccessors()));
-    assertTrue(m5.equals(
-        MessageNano.mergeFrom(new TestNanoAccessors(), MessageNano.toByteArray(m6))));
-
-    // -------
-
-    NanoReferenceTypes.TestAllTypesNano m7 = new NanoReferenceTypes.TestAllTypesNano();
-    m7.optionalFloat = Float.NaN;
-    m7.optionalDouble = Double.NaN;
-    NanoReferenceTypes.TestAllTypesNano m8 = new NanoReferenceTypes.TestAllTypesNano();
-    m8.optionalFloat = Float.NaN;
-    m8.optionalDouble = Double.NaN;
-    assertTrue(m7.equals(m8));
-    assertTrue(m7.equals(MessageNano.mergeFrom(
-        new NanoReferenceTypes.TestAllTypesNano(), MessageNano.toByteArray(m7))));
-
-    m7.optionalFloat = +0f;
-    m8.optionalFloat = -0f;
-    assertFalse(m7.equals(m8));
-
-    m7.optionalFloat = -0f;
-    m7.optionalDouble = +0d;
-    m8.optionalDouble = -0d;
-    assertFalse(m7.equals(m8));
-
-    m7.optionalDouble = -0d;
-    assertTrue(m7.equals(m8));
-    assertFalse(m7.equals(new NanoReferenceTypes.TestAllTypesNano()));
-    assertTrue(m7.equals(MessageNano.mergeFrom(
-        new NanoReferenceTypes.TestAllTypesNano(), MessageNano.toByteArray(m7))));
-  }
-
-  private static TestAllTypesNano generateMessageForOneof(int caseNumber) {
-    TestAllTypesNano result = new TestAllTypesNano();
-    TestAllTypesNano.NestedMessage nested =
-        new TestAllTypesNano.NestedMessage();
-    nested.bb = 2;
-    switch (caseNumber) {
-      case TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER:
-        result.setOneofUint32(1);
-        break;
-      case TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER:
-        result.setOneofEnum(TestAllTypesNano.BAR);
-        break;
-      case TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER:
-        result.setOneofNestedMessage(nested);
-        break;
-      case TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER:
-        result.setOneofBytes(new byte[] {1, 2});
-        break;
-      case TestAllTypesNano.ONEOF_STRING_FIELD_NUMBER:
-        result.setOneofString("hello");
-        break;
-      case TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER:
-        result.setOneofFixed64(-1L);
-        break;
-      default:
-        throw new RuntimeException("unexpected case number: " + caseNumber);
-    }
-    return result;
-  }
-
-  public void testOneofHashCodeEquals() throws Exception {
-    TestAllTypesNano m1 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER);
-    assertEquals(m1, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER));
-    assertFalse(m1.equals(new TestAllTypesNano()));
-
-    TestAllTypesNano m2 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER);
-    assertEquals(m2, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER));
-    assertFalse(m2.equals(new TestAllTypesNano()));
-
-    TestAllTypesNano m3 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER);
-    assertEquals(m3, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER));
-    assertFalse(m3.equals(new TestAllTypesNano()));
-
-    TestAllTypesNano m4 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER);
-    assertEquals(m4, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER));
-    assertFalse(m4.equals(new TestAllTypesNano()));
-
-    TestAllTypesNano m5 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_STRING_FIELD_NUMBER);
-    assertEquals(m5, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_STRING_FIELD_NUMBER));
-    assertFalse(m5.equals(new TestAllTypesNano()));
-
-    TestAllTypesNano m6 = generateMessageForOneof(
-        TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER);
-    assertEquals(m6, generateMessageForOneof(
-        TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER));
-    assertFalse(m6.equals(new TestAllTypesNano()));
-
-    Map<TestAllTypesNano, Integer> map =
-        new HashMap<TestAllTypesNano, Integer>();
-    map.put(m1, 1);
-    map.put(m2, 2);
-    map.put(m3, 3);
-    map.put(m4, 4);
-    map.put(m5, 5);
-    map.put(m6, 6);
-
-    assertEquals(6, map.size());
-  }
-
-  private void checkOneofCase(TestAllTypesNano nano, int field)
-      throws Exception {
-    assertEquals(field, nano.getOneofFieldCase());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER,
-        nano.hasOneofBytes());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER,
-        nano.hasOneofEnum());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER,
-        nano.hasOneofFixed64());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER,
-        nano.hasOneofNestedMessage());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_STRING_FIELD_NUMBER,
-        nano.hasOneofString());
-    assertEquals(
-        field == TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER,
-        nano.hasOneofUint32());
-
-  }
-
-  public void testOneofDefault() throws Exception {
-    TestAllTypesNano m1 = new TestAllTypesNano();
-    checkOneofCase(m1, 0);
-    assertEquals(WireFormatNano.EMPTY_BYTES, m1.getOneofBytes());
-    assertEquals(TestAllTypesNano.FOO, m1.getOneofEnum());
-    assertEquals(0L, m1.getOneofFixed64());
-    assertEquals(null, m1.getOneofNestedMessage());
-    assertEquals("", m1.getOneofString());
-    assertEquals(0, m1.getOneofUint32());
-  }
-
-  public void testOneofExclusiveness() throws Exception {
-    TestAllTypesNano m = new TestAllTypesNano();
-    checkOneofCase(m, 0);
-
-    m.setOneofBytes(new byte[]{0, 1});
-    checkOneofCase(m, TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER);
-    assertTrue(Arrays.equals(new byte[]{0,  1}, m.getOneofBytes()));
-
-    m.setOneofEnum(TestAllTypesNano.BAZ);
-    checkOneofCase(m, TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER);
-    assertEquals(TestAllTypesNano.BAZ, m.getOneofEnum());
-    assertEquals(WireFormatNano.EMPTY_BYTES, m.getOneofBytes());
-
-    m.setOneofFixed64(-1L);
-    checkOneofCase(m, TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER);
-    assertEquals(-1L, m.getOneofFixed64());
-    assertEquals(TestAllTypesNano.FOO, m.getOneofEnum());
-
-    m.setOneofNestedMessage(new TestAllTypesNano.NestedMessage());
-    checkOneofCase(m, TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER);
-    assertEquals(
-        new TestAllTypesNano.NestedMessage(), m.getOneofNestedMessage());
-    assertEquals(0L, m.getOneofFixed64());
-
-    m.setOneofString("hello");
-    checkOneofCase(m, TestAllTypesNano.ONEOF_STRING_FIELD_NUMBER);
-    assertEquals("hello", m.getOneofString());
-    assertNull(m.getOneofNestedMessage());
-
-    m.setOneofUint32(10);
-    checkOneofCase(m, TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER);
-    assertEquals(10, m.getOneofUint32());
-    assertEquals("", m.getOneofString());
-
-    m.setOneofBytes(new byte[]{0, 1});
-    checkOneofCase(m, TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER);
-    assertTrue(Arrays.equals(new byte[]{0,  1}, m.getOneofBytes()));
-    assertEquals(0, m.getOneofUint32());
-  }
-
-  public void testOneofClear() throws Exception {
-    TestAllTypesNano m = new TestAllTypesNano();
-    m.setOneofBytes(new byte[]{0, 1});
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-
-    m.setOneofEnum(TestAllTypesNano.BAZ);
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-
-    m.setOneofFixed64(-1L);
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-
-    m.setOneofNestedMessage(new TestAllTypesNano.NestedMessage());
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-
-    m.setOneofString("hello");
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-
-    m.setOneofUint32(10);
-    m.clearOneofField();
-    checkOneofCase(m, 0);
-  }
-
-  public void testOneofMarshaling() throws Exception {
-    TestAllTypesNano m = new TestAllTypesNano();
-    TestAllTypesNano parsed = new TestAllTypesNano();
-    {
-      m.setOneofBytes(new byte[]{0, 1});
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(parsed, TestAllTypesNano.ONEOF_BYTES_FIELD_NUMBER);
-      assertTrue(Arrays.equals(new byte[]{0, 1}, parsed.getOneofBytes()));
-    }
-    {
-      m.setOneofEnum(TestAllTypesNano.BAZ);
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(m, TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER);
-      assertEquals(TestAllTypesNano.BAZ, m.getOneofEnum());
-    }
-    {
-      m.setOneofEnum(TestAllTypesNano.BAZ);
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(m, TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER);
-      assertEquals(TestAllTypesNano.BAZ, m.getOneofEnum());
-    }
-    {
-      m.setOneofFixed64(-1L);
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(m, TestAllTypesNano.ONEOF_FIXED64_FIELD_NUMBER);
-      assertEquals(-1L, m.getOneofFixed64());
-    }
-    {
-      m.setOneofNestedMessage(new TestAllTypesNano.NestedMessage());
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(m, TestAllTypesNano.ONEOF_NESTED_MESSAGE_FIELD_NUMBER);
-      assertEquals(
-          new TestAllTypesNano.NestedMessage(), m.getOneofNestedMessage());
-    }
-    {
-      m.setOneofString("hello");
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      assertEquals("hello", m.getOneofString());
-      assertNull(m.getOneofNestedMessage());
-    }
-    {
-      m.setOneofUint32(10);
-      byte[] serialized = MessageNano.toByteArray(m);
-      MessageNano.mergeFrom(parsed, serialized);
-      checkOneofCase(m, TestAllTypesNano.ONEOF_UINT32_FIELD_NUMBER);
-      assertEquals(10, m.getOneofUint32());
-    }
-  }
-
-  public void testOneofSerializedConcat() throws Exception {
-    TestAllTypesNano m1 = new TestAllTypesNano();
-    m1.setOneofBytes(new byte[] {0, 1});
-    byte[] b1 = MessageNano.toByteArray(m1);
-    TestAllTypesNano m2 = new TestAllTypesNano();
-    m2.setOneofEnum(TestAllTypesNano.BAZ);
-    byte[] b2 = MessageNano.toByteArray(m2);
-    byte[] b3 = new byte[b1.length + b2.length];
-    System.arraycopy(b1, 0, b3, 0, b1.length);
-    System.arraycopy(b2, 0, b3, b1.length, b2.length);
-    TestAllTypesNano parsed = new TestAllTypesNano();
-    MessageNano.mergeFrom(parsed, b3);
-    // the last on the wire wins.
-    checkOneofCase(parsed, TestAllTypesNano.ONEOF_ENUM_FIELD_NUMBER);
-    assertEquals(TestAllTypesNano.BAZ, parsed.getOneofEnum());
-  }
-
-  public void testNullRepeatedFields() throws Exception {
-    // Check that serialization after explicitly setting a repeated field
-    // to null doesn't NPE.
-    TestAllTypesNano message = new TestAllTypesNano();
-    message.repeatedInt32 = null;
-    MessageNano.toByteArray(message);  // should not NPE
-    message.toString(); // should not NPE
-
-    message.repeatedNestedEnum = null;
-    MessageNano.toByteArray(message);  // should not NPE
-    message.toString(); // should not NPE
-
-    message.repeatedBytes = null;
-    MessageNano.toByteArray(message); // should not NPE
-    message.toString(); // should not NPE
-
-    message.repeatedNestedMessage = null;
-    MessageNano.toByteArray(message); // should not NPE
-    message.toString(); // should not NPE
-
-    message.repeatedPackedInt32 = null;
-    MessageNano.toByteArray(message); // should not NPE
-    message.toString(); // should not NPE
-
-    message.repeatedPackedNestedEnum = null;
-    MessageNano.toByteArray(message); // should not NPE
-    message.toString(); // should not NPE
-
-    // Create a second message to merge into message.
-    TestAllTypesNano secondMessage = new TestAllTypesNano();
-    secondMessage.repeatedInt32 = new int[] {1, 2, 3};
-    secondMessage.repeatedNestedEnum = new int[] {
-      TestAllTypesNano.FOO, TestAllTypesNano.BAR
-    };
-    secondMessage.repeatedBytes = new byte[][] {{1, 2}, {3, 4}};
-    TestAllTypesNano.NestedMessage nested =
-        new TestAllTypesNano.NestedMessage();
-    nested.bb = 55;
-    secondMessage.repeatedNestedMessage =
-        new TestAllTypesNano.NestedMessage[] {nested};
-    secondMessage.repeatedPackedInt32 = new int[] {1, 2, 3};
-    secondMessage.repeatedPackedNestedEnum = new int[] {
-        TestAllTypesNano.FOO, TestAllTypesNano.BAR
-      };
-
-    // Should not NPE
-    message.mergeFrom(CodedInputByteBufferNano.newInstance(
-        MessageNano.toByteArray(secondMessage)));
-    assertEquals(3, message.repeatedInt32.length);
-    assertEquals(3, message.repeatedInt32[2]);
-    assertEquals(2, message.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.FOO, message.repeatedNestedEnum[0]);
-    assertEquals(2, message.repeatedBytes.length);
-    assertEquals(4, message.repeatedBytes[1][1]);
-    assertEquals(1, message.repeatedNestedMessage.length);
-    assertEquals(55, message.repeatedNestedMessage[0].bb);
-    assertEquals(3, message.repeatedPackedInt32.length);
-    assertEquals(2, message.repeatedPackedInt32[1]);
-    assertEquals(2, message.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.BAR, message.repeatedPackedNestedEnum[1]);
-  }
-
-  public void testNullRepeatedFieldElements() throws Exception {
-    // Check that serialization with null array elements doesn't NPE.
-    String string1 = "1";
-    String string2 = "2";
-    byte[] bytes1 = {3, 4};
-    byte[] bytes2 = {5, 6};
-    TestAllTypesNano.NestedMessage msg1 = new TestAllTypesNano.NestedMessage();
-    msg1.bb = 7;
-    TestAllTypesNano.NestedMessage msg2 = new TestAllTypesNano.NestedMessage();
-    msg2.bb = 8;
-
-    TestAllTypesNano message = new TestAllTypesNano();
-    message.repeatedString = new String[] {null, string1, string2};
-    message.repeatedBytes = new byte[][] {bytes1, null, bytes2};
-    message.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] {msg1, msg2, null};
-    message.repeatedGroup = new TestAllTypesNano.RepeatedGroup[] {null, null, null};
-
-    byte[] serialized = MessageNano.toByteArray(message); // should not NPE
-    TestAllTypesNano deserialized = MessageNano.mergeFrom(new TestAllTypesNano(), serialized);
-    assertEquals(2, deserialized.repeatedString.length);
-    assertEquals(string1, deserialized.repeatedString[0]);
-    assertEquals(string2, deserialized.repeatedString[1]);
-    assertEquals(2, deserialized.repeatedBytes.length);
-    assertTrue(Arrays.equals(bytes1, deserialized.repeatedBytes[0]));
-    assertTrue(Arrays.equals(bytes2, deserialized.repeatedBytes[1]));
-    assertEquals(2, deserialized.repeatedNestedMessage.length);
-    assertEquals(msg1.bb, deserialized.repeatedNestedMessage[0].bb);
-    assertEquals(msg2.bb, deserialized.repeatedNestedMessage[1].bb);
-    assertEquals(0, deserialized.repeatedGroup.length);
-  }
-
-  public void testRepeatedMerge() throws Exception {
-    // Check that merging repeated fields cause the arrays to expand with
-    // new data.
-    TestAllTypesNano first = new TestAllTypesNano();
-    first.repeatedInt32 = new int[] {1, 2, 3};
-    TestAllTypesNano second = new TestAllTypesNano();
-    second.repeatedInt32 = new int[] {4, 5};
-    MessageNano.mergeFrom(first, MessageNano.toByteArray(second));
-    assertEquals(5, first.repeatedInt32.length);
-    assertEquals(1, first.repeatedInt32[0]);
-    assertEquals(4, first.repeatedInt32[3]);
-
-    first = new TestAllTypesNano();
-    first.repeatedNestedEnum = new int[] {TestAllTypesNano.BAR};
-    second = new TestAllTypesNano();
-    second.repeatedNestedEnum = new int[] {TestAllTypesNano.FOO};
-    MessageNano.mergeFrom(first, MessageNano.toByteArray(second));
-    assertEquals(2, first.repeatedNestedEnum.length);
-    assertEquals(TestAllTypesNano.BAR, first.repeatedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.FOO, first.repeatedNestedEnum[1]);
-
-    first = new TestAllTypesNano();
-    first.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] {
-      new TestAllTypesNano.NestedMessage()
-    };
-    first.repeatedNestedMessage[0].bb = 3;
-    second = new TestAllTypesNano();
-    second.repeatedNestedMessage = new TestAllTypesNano.NestedMessage[] {
-      new TestAllTypesNano.NestedMessage()
-    };
-    second.repeatedNestedMessage[0].bb = 5;
-    MessageNano.mergeFrom(first, MessageNano.toByteArray(second));
-    assertEquals(2, first.repeatedNestedMessage.length);
-    assertEquals(3, first.repeatedNestedMessage[0].bb);
-    assertEquals(5, first.repeatedNestedMessage[1].bb);
-
-    first = new TestAllTypesNano();
-    first.repeatedPackedSfixed64 = new long[] {-1, -2, -3};
-    second = new TestAllTypesNano();
-    second.repeatedPackedSfixed64 = new long[] {-4, -5};
-    MessageNano.mergeFrom(first, MessageNano.toByteArray(second));
-    assertEquals(5, first.repeatedPackedSfixed64.length);
-    assertEquals(-1, first.repeatedPackedSfixed64[0]);
-    assertEquals(-4, first.repeatedPackedSfixed64[3]);
-
-    first = new TestAllTypesNano();
-    first.repeatedPackedNestedEnum = new int[] {TestAllTypesNano.BAR};
-    second = new TestAllTypesNano();
-    second.repeatedPackedNestedEnum = new int[] {TestAllTypesNano.FOO};
-    MessageNano.mergeFrom(first, MessageNano.toByteArray(second));
-    assertEquals(2, first.repeatedPackedNestedEnum.length);
-    assertEquals(TestAllTypesNano.BAR, first.repeatedPackedNestedEnum[0]);
-    assertEquals(TestAllTypesNano.FOO, first.repeatedPackedNestedEnum[1]);
-
-    // Now test repeated merging in a nested scope
-    TestRepeatedMergeNano firstContainer = new TestRepeatedMergeNano();
-    firstContainer.contained = new TestAllTypesNano();
-    firstContainer.contained.repeatedInt32 = new int[] {10, 20};
-    TestRepeatedMergeNano secondContainer = new TestRepeatedMergeNano();
-    secondContainer.contained = new TestAllTypesNano();
-    secondContainer.contained.repeatedInt32 = new int[] {30};
-    MessageNano.mergeFrom(firstContainer, MessageNano.toByteArray(secondContainer));
-    assertEquals(3, firstContainer.contained.repeatedInt32.length);
-    assertEquals(20, firstContainer.contained.repeatedInt32[1]);
-    assertEquals(30, firstContainer.contained.repeatedInt32[2]);
-  }
-
-  public void testRepeatedPackables() throws Exception {
-    // Check that repeated fields with packable types can accept both packed and unpacked
-    // serialized forms.
-    NanoRepeatedPackables.NonPacked nonPacked = new NanoRepeatedPackables.NonPacked();
-    // Exaggerates the first values of varint-typed arrays. This is to test that the parsing code
-    // of packed fields handles non-packed data correctly. If the code incorrectly thinks it is
-    // reading from a packed tag, it will read the first value as the byte length of the field,
-    // and the large number will cause the input to go out of bounds, thus capturing the error.
-    nonPacked.int32S = new int[] {1000, 2, 3};
-    nonPacked.int64S = new long[] {4000, 5, 6};
-    nonPacked.uint32S = new int[] {7000, 8, 9};
-    nonPacked.uint64S = new long[] {10000, 11, 12};
-    nonPacked.sint32S = new int[] {13000, 14, 15};
-    nonPacked.sint64S = new long[] {16000, 17, 18};
-    nonPacked.fixed32S = new int[] {19, 20, 21};
-    nonPacked.fixed64S = new long[] {22, 23, 24};
-    nonPacked.sfixed32S = new int[] {25, 26, 27};
-    nonPacked.sfixed64S = new long[] {28, 29, 30};
-    nonPacked.floats = new float[] {31, 32, 33};
-    nonPacked.doubles = new double[] {34, 35, 36};
-    nonPacked.bools = new boolean[] {false, true};
-    nonPacked.enums = new int[] {
-      NanoRepeatedPackables.Enum.OPTION_ONE,
-      NanoRepeatedPackables.Enum.OPTION_TWO,
-    };
-    nonPacked.noise = 13579;
-
-    byte[] nonPackedSerialized = MessageNano.toByteArray(nonPacked);
-
-    NanoRepeatedPackables.Packed packed =
-        MessageNano.mergeFrom(new NanoRepeatedPackables.Packed(), nonPackedSerialized);
-    assertRepeatedPackablesEqual(nonPacked, packed);
-
-    byte[] packedSerialized = MessageNano.toByteArray(packed);
-    // Just a cautious check that the two serialized forms are different,
-    // to make sure the remaining of this test is useful:
-    assertFalse(Arrays.equals(nonPackedSerialized, packedSerialized));
-
-    nonPacked = MessageNano.mergeFrom(new NanoRepeatedPackables.NonPacked(), packedSerialized);
-    assertRepeatedPackablesEqual(nonPacked, packed);
-
-    // Test mixed serialized form.
-    byte[] mixedSerialized = new byte[nonPackedSerialized.length + packedSerialized.length];
-    System.arraycopy(nonPackedSerialized, 0, mixedSerialized, 0, nonPackedSerialized.length);
-    System.arraycopy(packedSerialized, 0,
-        mixedSerialized, nonPackedSerialized.length, packedSerialized.length);
-
-    nonPacked = MessageNano.mergeFrom(new NanoRepeatedPackables.NonPacked(), mixedSerialized);
-    packed = MessageNano.mergeFrom(new NanoRepeatedPackables.Packed(), mixedSerialized);
-    assertRepeatedPackablesEqual(nonPacked, packed);
-    assertTrue(Arrays.equals(new int[] {1000, 2, 3, 1000, 2, 3}, nonPacked.int32S));
-    assertTrue(Arrays.equals(new int[] {13000, 14, 15, 13000, 14, 15}, nonPacked.sint32S));
-    assertTrue(Arrays.equals(new int[] {25, 26, 27, 25, 26, 27}, nonPacked.sfixed32S));
-    assertTrue(Arrays.equals(new boolean[] {false, true, false, true}, nonPacked.bools));
-  }
-
-  public void testMapsSerializeAndParse() throws Exception {
-    TestMap origin = new TestMap();
-    setMapMessage(origin);
-    assertMapMessageSet(origin);
-
-    byte[] output = MessageNano.toByteArray(origin);
-    TestMap parsed = new TestMap();
-    MessageNano.mergeFrom(parsed, output);
-  }
-
-  public void testMapSerializeRejectNull() throws Exception {
-    TestMap primitiveMap = new TestMap();
-    primitiveMap.int32ToInt32Field = new HashMap<Integer, Integer>();
-    primitiveMap.int32ToInt32Field.put(null, 1);
-    try {
-      MessageNano.toByteArray(primitiveMap);
-      fail("should reject null keys");
-    } catch (IllegalStateException e) {
-      // pass.
-    }
-
-    TestMap messageMap = new TestMap();
-    messageMap.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    messageMap.int32ToMessageField.put(0, null);
-    try {
-      MessageNano.toByteArray(messageMap);
-      fail("should reject null values");
-    } catch (IllegalStateException e) {
-      // pass.
-    }
-  }
-
-  /**
-   * Tests that merging bytes containing conflicting keys with override the
-   * message value instead of merging the message value into the existing entry.
-   */
-  public void testMapMergeOverrideMessageValues() throws Exception {
-    TestMap.MessageValue origValue = new TestMap.MessageValue();
-    origValue.value = 1;
-    origValue.value2 = 2;
-    TestMap.MessageValue newValue = new TestMap.MessageValue();
-    newValue.value = 3;
-
-    TestMap origMessage = new TestMap();
-    origMessage.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    origMessage.int32ToMessageField.put(1, origValue);
-
-    TestMap newMessage = new TestMap();
-    newMessage.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    newMessage.int32ToMessageField.put(1, newValue);
-    MessageNano.mergeFrom(origMessage,
-        MessageNano.toByteArray(newMessage));
-    TestMap.MessageValue mergedValue = origMessage.int32ToMessageField.get(1);
-    assertEquals(3, mergedValue.value);
-    assertEquals(0, mergedValue.value2);
-  }
-
-  /**
-   * Tests that when merging with empty entries,
-   * we will use default for the key and value, instead of null.
-   */
-  public void testMapMergeEmptyEntry() throws Exception {
-    TestMap testMap = new TestMap();
-    byte[] buffer = new byte[1024];
-    CodedOutputByteBufferNano output =
-        CodedOutputByteBufferNano.newInstance(buffer);
-    // An empty entry for int32_to_int32 map.
-    output.writeTag(1, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-    output.writeRawVarint32(0);
-    // An empty entry for int32_to_message map.
-    output.writeTag(5, WireFormatNano.WIRETYPE_LENGTH_DELIMITED);
-    output.writeRawVarint32(0);
-
-    CodedInputByteBufferNano input = CodedInputByteBufferNano.newInstance(
-        buffer, 0, buffer.length - output.spaceLeft());
-    testMap.mergeFrom(input);
-    assertNotNull(testMap.int32ToInt32Field);;
-    assertEquals(1, testMap.int32ToInt32Field.size());
-    assertEquals(Integer.valueOf(0), testMap.int32ToInt32Field.get(0));
-    assertNotNull(testMap.int32ToMessageField);
-    assertEquals(1, testMap.int32ToMessageField.size());
-    TestMap.MessageValue messageValue = testMap.int32ToMessageField.get(0);
-    assertNotNull(messageValue);
-    assertEquals(0, messageValue.value);
-    assertEquals(0, messageValue.value2);
-  }
-
-  public void testMapEquals() throws Exception {
-    TestMap a = new TestMap();
-    TestMap b = new TestMap();
-
-    // empty and null map fields are equal.
-    assertTestMapEqual(a, b);
-    a.int32ToBytesField = new HashMap<Integer, byte[]>();
-    assertTestMapEqual(a, b);
-
-    a.int32ToInt32Field = new HashMap<Integer, Integer>();
-    b.int32ToInt32Field = new HashMap<Integer, Integer>();
-    setMap(a.int32ToInt32Field, deepCopy(int32Values), deepCopy(int32Values));
-    setMap(b.int32ToInt32Field, deepCopy(int32Values), deepCopy(int32Values));
-    assertTestMapEqual(a, b);
-
-    a.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    b.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    setMap(a.int32ToMessageField,
-        deepCopy(int32Values), deepCopy(messageValues));
-    setMap(b.int32ToMessageField,
-        deepCopy(int32Values), deepCopy(messageValues));
-    assertTestMapEqual(a, b);
-
-    a.stringToInt32Field = new HashMap<String, Integer>();
-    b.stringToInt32Field = new HashMap<String, Integer>();
-    setMap(a.stringToInt32Field, deepCopy(stringValues), deepCopy(int32Values));
-    setMap(b.stringToInt32Field, deepCopy(stringValues), deepCopy(int32Values));
-    assertTestMapEqual(a, b);
-
-    a.int32ToBytesField = new HashMap<Integer, byte[]>();
-    b.int32ToBytesField = new HashMap<Integer, byte[]>();
-    setMap(a.int32ToBytesField, deepCopy(int32Values), deepCopy(bytesValues));
-    setMap(b.int32ToBytesField, deepCopy(int32Values), deepCopy(bytesValues));
-    assertTestMapEqual(a, b);
-
-    // Make sure the map implementation does not matter.
-    a.int32ToStringField = new TreeMap<Integer, String>();
-    b.int32ToStringField = new HashMap<Integer, String>();
-    setMap(a.int32ToStringField, deepCopy(int32Values), deepCopy(stringValues));
-    setMap(b.int32ToStringField, deepCopy(int32Values), deepCopy(stringValues));
-    assertTestMapEqual(a, b);
-
-    a.clear();
-    b.clear();
-
-    // unequal cases: different value
-    a.int32ToInt32Field = new HashMap<Integer, Integer>();
-    b.int32ToInt32Field = new HashMap<Integer, Integer>();
-    a.int32ToInt32Field.put(1, 1);
-    b.int32ToInt32Field.put(1, 2);
-    assertTestMapUnequal(a, b);
-    // unequal case: additional entry
-    b.int32ToInt32Field.put(1, 1);
-    b.int32ToInt32Field.put(2, 1);
-    assertTestMapUnequal(a, b);
-    a.int32ToInt32Field.put(2, 1);
-    assertTestMapEqual(a, b);
-
-    // unequal case: different message value.
-    a.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    b.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    MessageValue va = new MessageValue();
-    va.value = 1;
-    MessageValue vb = new MessageValue();
-    vb.value = 1;
-    a.int32ToMessageField.put(1, va);
-    b.int32ToMessageField.put(1, vb);
-    assertTestMapEqual(a, b);
-    vb.value = 2;
-    assertTestMapUnequal(a, b);
-  }
-
-  private static void assertTestMapEqual(TestMap a, TestMap b)
-      throws Exception {
-    assertEquals(a.hashCode(), b.hashCode());
-    assertTrue(a.equals(b));
-    assertTrue(b.equals(a));
-  }
-
-  private static void assertTestMapUnequal(TestMap a, TestMap b)
-      throws Exception {
-    assertFalse(a.equals(b));
-    assertFalse(b.equals(a));
-  }
-
-  private static final Integer[] int32Values = new Integer[] {
-    0, 1, -1, Integer.MAX_VALUE, Integer.MIN_VALUE,
-  };
-
-  private static final Long[] int64Values = new Long[] {
-    0L, 1L, -1L, Long.MAX_VALUE, Long.MIN_VALUE,
-  };
-
-  private static final String[] stringValues = new String[] {
-    "", "hello", "world", "foo", "bar",
-  };
-
-  private static final byte[][] bytesValues = new byte[][] {
-    new byte[] {},
-    new byte[] {0},
-    new byte[] {1, -1},
-    new byte[] {127, -128},
-    new byte[] {'a', 'b', '0', '1'},
-  };
-
-  private static final Boolean[] boolValues = new Boolean[] {
-    false, true,
-  };
-
-  private static final Integer[] enumValues = new Integer[] {
-    TestMap.FOO, TestMap.BAR, TestMap.BAZ, TestMap.QUX,
-    Integer.MAX_VALUE /* unknown */,
-  };
-
-  private static final TestMap.MessageValue[] messageValues =
-      new TestMap.MessageValue[] {
-    newMapValueMessage(0),
-    newMapValueMessage(1),
-    newMapValueMessage(-1),
-    newMapValueMessage(Integer.MAX_VALUE),
-    newMapValueMessage(Integer.MIN_VALUE),
-  };
-
-  private static TestMap.MessageValue newMapValueMessage(int value) {
-    TestMap.MessageValue result = new TestMap.MessageValue();
-    result.value = value;
-    return result;
-  }
-
-  @SuppressWarnings("unchecked")
-  private static <T> T[] deepCopy(T[] orig) throws Exception {
-    if (orig instanceof MessageValue[]) {
-      MessageValue[] result = new MessageValue[orig.length];
-      for (int i = 0; i < orig.length; i++) {
-        result[i] = new MessageValue();
-        MessageNano.mergeFrom(
-            result[i], MessageNano.toByteArray((MessageValue) orig[i]));
-      }
-      return (T[]) result;
-    }
-    if (orig instanceof byte[][]) {
-      byte[][] result = new byte[orig.length][];
-      for (int i = 0; i < orig.length; i++) {
-        byte[] origBytes = (byte[]) orig[i];
-        result[i] = Arrays.copyOf(origBytes, origBytes.length);
-      }
-    }
-    return Arrays.copyOf(orig, orig.length);
-  }
-
-  private <K, V> void setMap(Map<K, V> map, K[] keys, V[] values) {
-    assert(keys.length == values.length);
-    for (int i = 0; i < keys.length; i++) {
-      map.put(keys[i], values[i]);
-    }
-  }
-
-  private <K, V> void assertMapSet(
-      Map<K, V> map, K[] keys, V[] values) throws Exception {
-    assert(keys.length == values.length);
-    for (int i = 0; i < values.length; i++) {
-      assertEquals(values[i], map.get(keys[i]));
-    }
-    assertEquals(keys.length, map.size());
-  }
-
-  private void setMapMessage(TestMap testMap) {
-    testMap.int32ToInt32Field = new HashMap<Integer, Integer>();
-    testMap.int32ToBytesField = new HashMap<Integer, byte[]>();
-    testMap.int32ToEnumField = new HashMap<Integer, Integer>();
-    testMap.int32ToMessageField =
-        new HashMap<Integer, MapTestProto.TestMap.MessageValue>();
-    testMap.int32ToStringField = new HashMap<Integer, String>();
-    testMap.stringToInt32Field = new HashMap<String, Integer>();
-    testMap.boolToBoolField = new HashMap<Boolean, Boolean>();
-    testMap.uint32ToUint32Field = new HashMap<Integer, Integer>();
-    testMap.sint32ToSint32Field = new HashMap<Integer, Integer>();
-    testMap.fixed32ToFixed32Field = new HashMap<Integer, Integer>();
-    testMap.sfixed32ToSfixed32Field = new HashMap<Integer, Integer>();
-    testMap.int64ToInt64Field = new HashMap<Long, Long>();
-    testMap.uint64ToUint64Field = new HashMap<Long, Long>();
-    testMap.sint64ToSint64Field = new HashMap<Long, Long>();
-    testMap.fixed64ToFixed64Field = new HashMap<Long, Long>();
-    testMap.sfixed64ToSfixed64Field = new HashMap<Long, Long>();
-    setMap(testMap.int32ToInt32Field, int32Values, int32Values);
-    setMap(testMap.int32ToBytesField, int32Values, bytesValues);
-    setMap(testMap.int32ToEnumField, int32Values, enumValues);
-    setMap(testMap.int32ToMessageField, int32Values, messageValues);
-    setMap(testMap.int32ToStringField, int32Values, stringValues);
-    setMap(testMap.stringToInt32Field, stringValues, int32Values);
-    setMap(testMap.boolToBoolField, boolValues, boolValues);
-    setMap(testMap.uint32ToUint32Field, int32Values, int32Values);
-    setMap(testMap.sint32ToSint32Field, int32Values, int32Values);
-    setMap(testMap.fixed32ToFixed32Field, int32Values, int32Values);
-    setMap(testMap.sfixed32ToSfixed32Field, int32Values, int32Values);
-    setMap(testMap.int64ToInt64Field, int64Values, int64Values);
-    setMap(testMap.uint64ToUint64Field, int64Values, int64Values);
-    setMap(testMap.sint64ToSint64Field, int64Values, int64Values);
-    setMap(testMap.fixed64ToFixed64Field, int64Values, int64Values);
-    setMap(testMap.sfixed64ToSfixed64Field, int64Values, int64Values);
-  }
-  private void assertMapMessageSet(TestMap testMap) throws Exception {
-    assertMapSet(testMap.int32ToInt32Field, int32Values, int32Values);
-    assertMapSet(testMap.int32ToBytesField, int32Values, bytesValues);
-    assertMapSet(testMap.int32ToEnumField, int32Values, enumValues);
-    assertMapSet(testMap.int32ToMessageField, int32Values, messageValues);
-    assertMapSet(testMap.int32ToStringField, int32Values, stringValues);
-    assertMapSet(testMap.stringToInt32Field, stringValues, int32Values);
-    assertMapSet(testMap.boolToBoolField, boolValues, boolValues);
-    assertMapSet(testMap.uint32ToUint32Field, int32Values, int32Values);
-    assertMapSet(testMap.sint32ToSint32Field, int32Values, int32Values);
-    assertMapSet(testMap.fixed32ToFixed32Field, int32Values, int32Values);
-    assertMapSet(testMap.sfixed32ToSfixed32Field, int32Values, int32Values);
-    assertMapSet(testMap.int64ToInt64Field, int64Values, int64Values);
-    assertMapSet(testMap.uint64ToUint64Field, int64Values, int64Values);
-    assertMapSet(testMap.sint64ToSint64Field, int64Values, int64Values);
-    assertMapSet(testMap.fixed64ToFixed64Field, int64Values, int64Values);
-    assertMapSet(testMap.sfixed64ToSfixed64Field, int64Values, int64Values);
-  }
-
-  public void testRepeatedFieldInitializedInReftypesCompatMode() {
-    NanoReferenceTypesCompat.TestAllTypesNano proto = new NanoReferenceTypesCompat.TestAllTypesNano();
-    assertNotNull(proto.repeatedString);
-  }
-
-  private void assertRepeatedPackablesEqual(
-      NanoRepeatedPackables.NonPacked nonPacked, NanoRepeatedPackables.Packed packed) {
-    // Not using MessageNano.equals() -- that belongs to a separate test.
-    assertTrue(Arrays.equals(nonPacked.int32S, packed.int32S));
-    assertTrue(Arrays.equals(nonPacked.int64S, packed.int64S));
-    assertTrue(Arrays.equals(nonPacked.uint32S, packed.uint32S));
-    assertTrue(Arrays.equals(nonPacked.uint64S, packed.uint64S));
-    assertTrue(Arrays.equals(nonPacked.sint32S, packed.sint32S));
-    assertTrue(Arrays.equals(nonPacked.sint64S, packed.sint64S));
-    assertTrue(Arrays.equals(nonPacked.fixed32S, packed.fixed32S));
-    assertTrue(Arrays.equals(nonPacked.fixed64S, packed.fixed64S));
-    assertTrue(Arrays.equals(nonPacked.sfixed32S, packed.sfixed32S));
-    assertTrue(Arrays.equals(nonPacked.sfixed64S, packed.sfixed64S));
-    assertTrue(Arrays.equals(nonPacked.floats, packed.floats));
-    assertTrue(Arrays.equals(nonPacked.doubles, packed.doubles));
-    assertTrue(Arrays.equals(nonPacked.bools, packed.bools));
-    assertTrue(Arrays.equals(nonPacked.enums, packed.enums));
-  }
-
-  public void testClone() throws Exception {
-    // A simple message.
-    AnotherMessage anotherMessage = new AnotherMessage();
-    anotherMessage.string = "Hello";
-    anotherMessage.value = true;
-    anotherMessage.integers = new int[] { 1, 2, 3 };
-
-    AnotherMessage clone = anotherMessage.clone();
-    assertEquals(clone, anotherMessage);
-
-    // Verify it was a deep clone - changes to the clone shouldn't affect the
-    // original.
-    clone.integers[1] = 100;
-    assertFalse(clone.equals(anotherMessage));
-  }
-
-  private void assertHasWireData(MessageNano message, boolean expected) {
-    byte[] bytes = MessageNano.toByteArray(message);
-    int wireLength = bytes.length;
-    if (expected) {
-      assertFalse(wireLength == 0);
-    } else {
-      if (wireLength != 0) {
-        fail("Expected no wire data for message \n" + message
-            + "\nBut got:\n"
-            + hexDump(bytes));
-      }
-    }
-  }
-
-  private static String hexDump(byte[] bytes) {
-    StringBuilder sb = new StringBuilder();
-    for (byte b : bytes) {
-      sb.append(String.format("%02x ", b));
-    }
-    return sb.toString();
-  }
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto
deleted file mode 100644
index 6511e470..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_accessors_nano.proto
+++ /dev/null
@@ -1,118 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: maxtroy@google.com (Max Cai)
-
-package protobuf_unittest;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "NanoAccessorsOuterClass";
-
-message TestNanoAccessors {
-
-  message NestedMessage {
-    optional int32 bb = 1;
-  }
-
-  enum NestedEnum {
-    FOO = 1;
-    BAR = 2;
-    BAZ = 3;
-  }
-
-  // Singular
-  optional int32  optional_int32    =  1;
-  optional float  optional_float    = 11;
-  optional double optional_double   = 12;
-  optional string optional_string   = 14;
-  optional bytes  optional_bytes    = 15;
-
-  optional NestedMessage optional_nested_message = 18;
-
-  optional NestedEnum optional_nested_enum = 21;
-
-  // Repeated
-  repeated int32  repeated_int32    = 31;
-  repeated string repeated_string   = 44;
-  repeated bytes  repeated_bytes    = 45;
-
-  repeated NestedMessage repeated_nested_message  = 48;
-
-  repeated NestedEnum repeated_nested_enum  = 51;
-
-  // Singular with defaults
-  optional int32  default_int32    = 61 [default =  41    ];
-  optional string default_string   = 74 [default = "hello"];
-  optional bytes  default_bytes    = 75 [default = "world"];
-
-  optional float default_float_nan = 99  [default =  nan];
-
-  optional NestedEnum default_nested_enum = 81 [default = BAR];
-
-  // Required
-  required int32 id = 86;
-
-  // Add enough optional fields to make 2 bit fields in total
-  optional int32 filler100 = 100;
-  optional int32 filler101 = 101;
-  optional int32 filler102 = 102;
-  optional int32 filler103 = 103;
-  optional int32 filler104 = 104;
-  optional int32 filler105 = 105;
-  optional int32 filler106 = 106;
-  optional int32 filler107 = 107;
-  optional int32 filler108 = 108;
-  optional int32 filler109 = 109;
-  optional int32 filler110 = 110;
-  optional int32 filler111 = 111;
-  optional int32 filler112 = 112;
-  optional int32 filler113 = 113;
-  optional int32 filler114 = 114;
-  optional int32 filler115 = 115;
-  optional int32 filler116 = 116;
-  optional int32 filler117 = 117;
-  optional int32 filler118 = 118;
-  optional int32 filler119 = 119;
-  optional int32 filler120 = 120;
-  optional int32 filler121 = 121;
-  optional int32 filler122 = 122;
-  optional int32 filler123 = 123;
-  optional int32 filler124 = 124;
-  optional int32 filler125 = 125;
-  optional int32 filler126 = 126;
-  optional int32 filler127 = 127;
-  optional int32 filler128 = 128;
-  optional int32 filler129 = 129;
-  optional int32 filler130 = 130;
-
-  optional int32 before_bit_field_check = 139;
-  optional int32 bit_field_check = 140;
-  optional int32 after_bit_field_check = 141;
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
deleted file mode 100644
index c0da8b42..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
+++ /dev/null
@@ -1,28 +0,0 @@
-package protobuf_unittest;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "EnumValidity";
-
-enum E {
-  default = 1; // test java keyword renaming
-  FOO = 2;
-  BAR = 3;
-  BAZ = 4;
-}
-
-message M {
-  optional E optional_e = 1;
-  optional E default_e = 2 [ default = BAZ ];
-  repeated E repeated_e = 3;
-  repeated E packed_e = 4 [ packed = true ];
-  repeated E repeated_e2 = 5;
-  repeated E packed_e2 = 6 [ packed = true ];
-  repeated E repeated_e3 = 7;
-  repeated E packed_e3 = 8 [ packed = true ];
-}
-
-message Alt {
-  optional E repeated_e2_as_optional = 5;
-  repeated E packed_e2_as_non_packed = 6;
-  repeated E non_packed_e3_as_packed = 7 [ packed = true ];
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto
deleted file mode 100644
index ca56b3dd..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_nano.proto
+++ /dev/null
@@ -1,37 +0,0 @@
-syntax = "proto2";
-
-option java_outer_classname = "Extensions";
-option java_package = "com.google.protobuf.nano.testext";
-
-message ExtendableMessage {
-  optional int32 field = 1;
-  extensions 10 to max;
-}
-
-enum AnEnum {
-  FIRST_VALUE = 1;
-  SECOND_VALUE = 2;
-}
-
-message AnotherMessage {
-  optional string string = 1;
-  optional bool value = 2;
-  repeated int32 integers = 3;
-}
-
-message ContainerMessage {
-  extend ExtendableMessage {
-    optional bool another_thing = 100;
-    // The largest permitted field number, per
-    // https://developers.google.com/protocol-buffers/docs/proto#simple
-    optional bool large_field_number = 536870911;
-  }
-}
-
-// For testNanoOptionalGroupWithUnknownFieldsEnabled;
-// not part of the extensions tests.
-message MessageWithGroup {
-  optional group Group = 1 {
-    optional int32 a = 2;
-  }
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto
deleted file mode 100644
index 3b7a004c..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto
+++ /dev/null
@@ -1,29 +0,0 @@
-syntax = "proto2";
-
-option java_multiple_files = true;
-option java_package = "com.google.protobuf";
-
-import "google/protobuf/nano/unittest_extension_nano.proto";
-
-// Must be compiled separately due to extension number reuse.
-// The reuse is deliberate, for testing wire compatibility.
-
-message PackedExtensions {
-  extend ExtendableMessage {
-    repeated int32    packed_int32    = 10 [ packed = true ];
-    repeated uint32   packed_uint32   = 11 [ packed = true ];
-    repeated sint32   packed_sint32   = 12 [ packed = true ];
-    repeated int64    packed_int64    = 13 [ packed = true ];
-    repeated uint64   packed_uint64   = 14 [ packed = true ];
-    repeated sint64   packed_sint64   = 15 [ packed = true ];
-    repeated fixed32  packed_fixed32  = 16 [ packed = true ];
-    repeated sfixed32 packed_sfixed32 = 17 [ packed = true ];
-    repeated fixed64  packed_fixed64  = 18 [ packed = true ];
-    repeated sfixed64 packed_sfixed64 = 19 [ packed = true ];
-    repeated bool     packed_bool     = 20 [ packed = true ];
-    repeated float    packed_float    = 21 [ packed = true ];
-    repeated double   packed_double   = 22 [ packed = true ];
-    repeated AnEnum   packed_enum     = 23 [ packed = true ];
-    // Non-packable types omitted.
-  }
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto
deleted file mode 100644
index e533c65b..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_repeated_nano.proto
+++ /dev/null
@@ -1,34 +0,0 @@
-syntax = "proto2";
-
-option java_multiple_files = true;
-option java_package = "com.google.protobuf";
-
-import "google/protobuf/nano/unittest_extension_nano.proto";
-
-// Must be compiled separately due to extension number reuse.
-// The reuse is deliberate, for testing wire compatibility.
-
-message RepeatedExtensions {
-  extend ExtendableMessage {
-    repeated int32          repeated_int32    = 10;
-    repeated uint32         repeated_uint32   = 11;
-    repeated sint32         repeated_sint32   = 12;
-    repeated int64          repeated_int64    = 13;
-    repeated uint64         repeated_uint64   = 14;
-    repeated sint64         repeated_sint64   = 15;
-    repeated fixed32        repeated_fixed32  = 16;
-    repeated sfixed32       repeated_sfixed32 = 17;
-    repeated fixed64        repeated_fixed64  = 18;
-    repeated sfixed64       repeated_sfixed64 = 19;
-    repeated bool           repeated_bool     = 20;
-    repeated float          repeated_float    = 21;
-    repeated double         repeated_double   = 22;
-    repeated AnEnum         repeated_enum     = 23;
-    repeated string         repeated_string   = 24;
-    repeated bytes          repeated_bytes    = 25;
-    repeated AnotherMessage repeated_message  = 26;
-    repeated group          RepeatedGroup     = 27 {
-      optional int32 a = 1;
-    }
-  }
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto
deleted file mode 100644
index 8b2d9658..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_singular_nano.proto
+++ /dev/null
@@ -1,34 +0,0 @@
-syntax = "proto2";
-
-option java_multiple_files = true;
-option java_package = "com.google.protobuf";
-
-import "google/protobuf/nano/unittest_extension_nano.proto";
-
-// Must be compiled separately due to extension number reuse.
-// The reuse is deliberate, for testing wire compatibility.
-
-message SingularExtensions {
-  extend ExtendableMessage {
-    optional int32          some_int32    = 10;
-    optional uint32         some_uint32   = 11;
-    optional sint32         some_sint32   = 12;
-    optional int64          some_int64    = 13;
-    optional uint64         some_uint64   = 14;
-    optional sint64         some_sint64   = 15;
-    optional fixed32        some_fixed32  = 16;
-    optional sfixed32       some_sfixed32 = 17;
-    optional fixed64        some_fixed64  = 18;
-    optional sfixed64       some_sfixed64 = 19;
-    optional bool           some_bool     = 20;
-    optional float          some_float    = 21;
-    optional double         some_double   = 22;
-    optional AnEnum         some_enum     = 23;
-    optional string         some_string   = 24;
-    optional bytes          some_bytes    = 25;
-    optional AnotherMessage some_message  = 26;
-    optional group          SomeGroup     = 27 {
-      optional int32 a = 1;
-    }
-  }
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_nano.proto
deleted file mode 100644
index 3fff24c0..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_nano.proto
+++ /dev/null
@@ -1,195 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: wink@google.com (Wink Saville)
-
-package protobuf_unittest;
-
-import "google/protobuf/nano/unittest_import_nano.proto";
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "NanoOuterClass";
-
-// Same as TestAllTypes but with the nano runtime.
-message TestAllTypesNano {
-
-  message NestedMessage {
-    optional int32 bb = 1;
-  }
-
-  enum NestedEnum {
-    FOO = 1;
-    BAR = 2;
-    BAZ = 3;
-  }
-
-  // Singular
-  optional    int32 optional_int32    =  1;
-  optional    int64 optional_int64    =  2;
-  optional   uint32 optional_uint32   =  3;
-  optional   uint64 optional_uint64   =  4;
-  optional   sint32 optional_sint32   =  5;
-  optional   sint64 optional_sint64   =  6;
-  optional  fixed32 optional_fixed32  =  7;
-  optional  fixed64 optional_fixed64  =  8;
-  optional sfixed32 optional_sfixed32 =  9;
-  optional sfixed64 optional_sfixed64 = 10;
-  optional    float optional_float    = 11;
-  optional   double optional_double   = 12;
-  optional     bool optional_bool     = 13;
-  optional   string optional_string   = 14;
-  optional    bytes optional_bytes    = 15;
-
-  optional group OptionalGroup = 16 {
-    optional int32 a = 17;
-  }
-
-  optional NestedMessage      optional_nested_message  = 18;
-  optional ForeignMessageNano optional_foreign_message = 19;
-  optional protobuf_unittest_import.ImportMessageNano
-    optional_import_message = 20;
-
-  optional NestedEnum      optional_nested_enum     = 21;
-  optional ForeignEnumNano optional_foreign_enum    = 22;
-  optional protobuf_unittest_import.ImportEnumNano optional_import_enum = 23;
-
-  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
-  optional string optional_cord = 25 [ctype=CORD];
-
-  // Repeated
-  repeated    int32 repeated_int32    = 31;
-  repeated    int64 repeated_int64    = 32;
-  repeated   uint32 repeated_uint32   = 33;
-  repeated   uint64 repeated_uint64   = 34;
-  repeated   sint32 repeated_sint32   = 35;
-  repeated   sint64 repeated_sint64   = 36;
-  repeated  fixed32 repeated_fixed32  = 37;
-  repeated  fixed64 repeated_fixed64  = 38;
-  repeated sfixed32 repeated_sfixed32 = 39;
-  repeated sfixed64 repeated_sfixed64 = 40;
-  repeated    float repeated_float    = 41;
-  repeated   double repeated_double   = 42;
-  repeated     bool repeated_bool     = 43;
-  repeated   string repeated_string   = 44;
-  repeated    bytes repeated_bytes    = 45;
-
-  repeated group RepeatedGroup = 46 {
-    optional int32 a = 47;
-  }
-
-  repeated NestedMessage      repeated_nested_message  = 48;
-  repeated ForeignMessageNano repeated_foreign_message = 49;
-  repeated protobuf_unittest_import.ImportMessageNano
-    repeated_import_message = 50;
-
-  repeated NestedEnum      repeated_nested_enum  = 51;
-  repeated ForeignEnumNano repeated_foreign_enum = 52;
-  repeated protobuf_unittest_import.ImportEnumNano repeated_import_enum = 53;
-
-  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
-  repeated string repeated_cord = 55 [ctype=CORD];
-
-  // Repeated packed
-  repeated    int32 repeated_packed_int32    = 87 [packed=true];
-  repeated sfixed64 repeated_packed_sfixed64 = 88 [packed=true];
-
-  repeated NestedEnum repeated_packed_nested_enum  = 89 [packed=true];
-
-  // Singular with defaults
-  optional    int32 default_int32    = 61 [default =  41    ];
-  optional    int64 default_int64    = 62 [default =  42    ];
-  optional   uint32 default_uint32   = 63 [default =  43    ];
-  optional   uint64 default_uint64   = 64 [default =  44    ];
-  optional   sint32 default_sint32   = 65 [default = -45    ];
-  optional   sint64 default_sint64   = 66 [default =  46    ];
-  optional  fixed32 default_fixed32  = 67 [default =  47    ];
-  optional  fixed64 default_fixed64  = 68 [default =  48    ];
-  optional sfixed32 default_sfixed32 = 69 [default =  49    ];
-  optional sfixed64 default_sfixed64 = 70 [default = -50    ];
-  optional    float default_float    = 71 [default =  51.5  ];
-  optional   double default_double   = 72 [default =  52e3  ];
-  optional     bool default_bool     = 73 [default = true   ];
-  optional   string default_string   = 74 [default = "hello"];
-  optional    bytes default_bytes    = 75 [default = "world"];
-
-  optional string default_string_nonascii = 76 [default = "dünya"];
-  optional  bytes default_bytes_nonascii  = 77 [default = "dünyab"];
-
-  optional  float default_float_inf      = 97  [default =  inf];
-  optional  float default_float_neg_inf  = 98  [default = -inf];
-  optional  float default_float_nan      = 99  [default =  nan];
-  optional double default_double_inf     = 100 [default =  inf];
-  optional double default_double_neg_inf = 101 [default = -inf];
-  optional double default_double_nan     = 102 [default =  nan];
-
-  optional NestedEnum default_nested_enum = 81 [default = BAR];
-  optional ForeignEnumNano default_foreign_enum = 82
-      [default = FOREIGN_NANO_BAR];
-  optional protobuf_unittest_import.ImportEnumNano
-      default_import_enum = 83 [default = IMPORT_NANO_BAR];
-
-  optional string default_string_piece = 84 [ctype=STRING_PIECE,default="abc"];
-  optional string default_cord = 85 [ctype=CORD,default="123"];
-
-  required int32 id = 86;
-
-  // Try to cause conflicts.
-  optional int32 tag = 93;
-  optional int32 get_serialized_size = 94;
-  optional int32 write_to = 95;
-
-  // Try to fail with java reserved keywords
-  optional int32 synchronized = 96;
-
-  oneof oneof_field {
-    uint32 oneof_uint32 = 111;
-    NestedMessage oneof_nested_message = 112;
-    string oneof_string = 123;
-    bytes oneof_bytes = 124;
-    fixed64 oneof_fixed64 = 115;
-    NestedEnum oneof_enum = 116;
-  }
-}
-
-message ForeignMessageNano {
-  optional int32 c = 1;
-}
-
-enum ForeignEnumNano {
-  FOREIGN_NANO_FOO = 4;
-  FOREIGN_NANO_BAR = 5;
-  FOREIGN_NANO_BAZ = 6;
-}
-
-// Test that deprecated fields work.  We only verify that they compile (at one
-// point this failed).
-message TestDeprecatedNano {
-  optional int32 deprecated_field = 1 [deprecated = true];
-}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto
deleted file mode 100644
index 82eb8d11..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_reference_types_nano.proto
+++ /dev/null
@@ -1,116 +0,0 @@
-package protobuf_unittest;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "NanoReferenceTypes";
-
-message TestAllTypesNano {
-
-  enum NestedEnum {
-    FOO = 1;
-    BAR = 2;
-    BAZ = 3;
-  }
-
-  message NestedMessage {
-    optional int32 foo = 1;
-  }
-
-  // Singular
-  optional    int32 optional_int32    =  1;
-  optional    int64 optional_int64    =  2;
-  optional   uint32 optional_uint32   =  3;
-  optional   uint64 optional_uint64   =  4;
-  optional   sint32 optional_sint32   =  5;
-  optional   sint64 optional_sint64   =  6;
-  optional  fixed32 optional_fixed32  =  7;
-  optional  fixed64 optional_fixed64  =  8;
-  optional sfixed32 optional_sfixed32 =  9;
-  optional sfixed64 optional_sfixed64 = 10;
-  optional    float optional_float    = 11;
-  optional   double optional_double   = 12;
-  optional     bool optional_bool     = 13;
-  optional   string optional_string   = 14;
-  optional    bytes optional_bytes    = 15;
-
-  optional group OptionalGroup = 16 {
-    optional int32 a = 17;
-  }
-
-  optional NestedMessage      optional_nested_message  = 18;
-
-  optional NestedEnum      optional_nested_enum     = 21;
-
-  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
-  optional string optional_cord = 25 [ctype=CORD];
-
-  // Repeated
-  repeated    int32 repeated_int32    = 31;
-  repeated    int64 repeated_int64    = 32;
-  repeated   uint32 repeated_uint32   = 33;
-  repeated   uint64 repeated_uint64   = 34;
-  repeated   sint32 repeated_sint32   = 35;
-  repeated   sint64 repeated_sint64   = 36;
-  repeated  fixed32 repeated_fixed32  = 37;
-  repeated  fixed64 repeated_fixed64  = 38;
-  repeated sfixed32 repeated_sfixed32 = 39;
-  repeated sfixed64 repeated_sfixed64 = 40;
-  repeated    float repeated_float    = 41;
-  repeated   double repeated_double   = 42;
-  repeated     bool repeated_bool     = 43;
-  repeated   string repeated_string   = 44;
-  repeated    bytes repeated_bytes    = 45;
-
-  repeated group RepeatedGroup = 46 {
-    optional int32 a = 47;
-  }
-
-  repeated NestedMessage      repeated_nested_message  = 48;
-
-  repeated NestedEnum      repeated_nested_enum  = 51;
-
-  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
-  repeated string repeated_cord = 55 [ctype=CORD];
-
-  // Repeated packed
-  repeated    int32 repeated_packed_int32    = 87 [packed=true];
-  repeated sfixed64 repeated_packed_sfixed64 = 88 [packed=true];
-
-  repeated NestedEnum repeated_packed_nested_enum  = 89 [packed=true];
-
-  // Singular with defaults
-  optional    int32 default_int32    = 61 [default =  41    ];
-  optional    int64 default_int64    = 62 [default =  42    ];
-  optional   uint32 default_uint32   = 63 [default =  43    ];
-  optional   uint64 default_uint64   = 64 [default =  44    ];
-  optional   sint32 default_sint32   = 65 [default = -45    ];
-  optional   sint64 default_sint64   = 66 [default =  46    ];
-  optional  fixed32 default_fixed32  = 67 [default =  47    ];
-  optional  fixed64 default_fixed64  = 68 [default =  48    ];
-  optional sfixed32 default_sfixed32 = 69 [default =  49    ];
-  optional sfixed64 default_sfixed64 = 70 [default = -50    ];
-  optional    float default_float    = 71 [default =  51.5  ];
-  optional   double default_double   = 72 [default =  52e3  ];
-  optional     bool default_bool     = 73 [default = true   ];
-  optional   string default_string   = 74 [default = "hello"];
-  optional    bytes default_bytes    = 75 [default = "world"];
-
-
-  optional  float default_float_inf      = 97  [default =  inf];
-  optional  float default_float_neg_inf  = 98  [default = -inf];
-  optional  float default_float_nan      = 99  [default =  nan];
-  optional double default_double_inf     = 100 [default =  inf];
-  optional double default_double_neg_inf = 101 [default = -inf];
-  optional double default_double_nan     = 102 [default =  nan];
-
-}
-
-message ForeignMessageNano {
-  optional int32 c = 1;
-}
-
-enum ForeignEnumNano {
-  FOREIGN_NANO_FOO = 4;
-  FOREIGN_NANO_BAR = 5;
-  FOREIGN_NANO_BAZ = 6;
-}
-
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto b/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto
deleted file mode 100644
index 96af8856..00000000
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_packables_nano.proto
+++ /dev/null
@@ -1,95 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: maxtroy@google.com (Max Cai)
-
-package protobuf_unittest;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "NanoRepeatedPackables";
-
-enum Enum {
-  OPTION_ONE = 1;
-  OPTION_TWO = 2;
-}
-
-// Two almost identical messages with all packable repeated field types.
-// One with none marked as packed and the other all packed. For
-// compatibility, they should be able to parse each other's serialized
-// forms.
-
-message NonPacked {
-
-  // All packable types, none marked as packed.
-
-  repeated    int32 int32s    = 1;
-  repeated    int64 int64s    = 2;
-  repeated   uint32 uint32s   = 3;
-  repeated   uint64 uint64s   = 4;
-  repeated   sint32 sint32s   = 5;
-  repeated   sint64 sint64s   = 6;
-  repeated  fixed32 fixed32s  = 7;
-  repeated  fixed64 fixed64s  = 8;
-  repeated sfixed32 sfixed32s = 9;
-  repeated sfixed64 sfixed64s = 10;
-  repeated    float floats    = 11;
-  repeated   double doubles   = 12;
-  repeated     bool bools     = 13;
-  repeated     Enum enums     = 14;
-
-  // Noise for testing merged deserialization.
-  optional int32 noise = 15;
-
-}
-
-message Packed {
-
-  // All packable types, all matching the field numbers in NonPacked,
-  // all marked as packed.
-
-  repeated    int32 int32s    = 1  [ packed = true ];
-  repeated    int64 int64s    = 2  [ packed = true ];
-  repeated   uint32 uint32s   = 3  [ packed = true ];
-  repeated   uint64 uint64s   = 4  [ packed = true ];
-  repeated   sint32 sint32s   = 5  [ packed = true ];
-  repeated   sint64 sint64s   = 6  [ packed = true ];
-  repeated  fixed32 fixed32s  = 7  [ packed = true ];
-  repeated  fixed64 fixed64s  = 8  [ packed = true ];
-  repeated sfixed32 sfixed32s = 9  [ packed = true ];
-  repeated sfixed64 sfixed64s = 10 [ packed = true ];
-  repeated    float floats    = 11 [ packed = true ];
-  repeated   double doubles   = 12 [ packed = true ];
-  repeated     bool bools     = 13 [ packed = true ];
-  repeated     Enum enums     = 14 [ packed = true ];
-
-  // Noise for testing merged deserialization.
-  optional int32 noise = 15;
-
-}
diff --git a/jenkins/README.md b/jenkins/README.md
deleted file mode 100644
index 29f664f2..00000000
--- a/jenkins/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-
-Jenkins Infrastructure
-----------------------
-
-The scripts in this directory serve as plumbing for running the protobuf
-tests under Jenkins.
diff --git a/jenkins/buildcmds/README.md b/jenkins/buildcmds/README.md
deleted file mode 100644
index 7a48f2d5..00000000
--- a/jenkins/buildcmds/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-
-Jenkins Build Commands
-----------------------
-
-The scripts in this directory are designed to be top-level entry points for
-Jenkins projects.
diff --git a/jenkins/buildcmds/pull_request_32.sh b/jenkins/buildcmds/pull_request_32.sh
deleted file mode 100755
index bf0fb7ff..00000000
--- a/jenkins/buildcmds/pull_request_32.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/bash
-#
-# This is the top-level script we give to Jenkins as the entry point for
-# running the "pull request 32" project:
-#
-#   https://grpc-testing.appspot.com/view/Protocol%20Buffers/job/Protocol%20Buffers%20Pull%20Request%2032/
-#
-# This script selects a specific Dockerfile (for building a Docker image) and
-# a script to run inside that image.  Then we delegate to the general
-# build_and_run_docker.sh script.
-
-export DOCKERFILE_DIR=jenkins/docker32
-export DOCKER_RUN_SCRIPT=jenkins/pull_request_in_docker.sh
-export OUTPUT_DIR=testoutput
-export TEST_SET="php_all_32"
-./jenkins/build_and_run_docker.sh
diff --git a/js/README.md b/js/README.md
index f4184621..ef0d4b19 100644
--- a/js/README.md
+++ b/js/README.md
@@ -19,7 +19,9 @@ resolve imports at compile time.
 To use Protocol Buffers with JavaScript, you need two main components:
 
 1. The protobuf runtime library.  You can install this with
-   `npm install google-protobuf`, or use the files in this directory.
+   `npm install google-protobuf`, or use the files in this directory.  
+    If npm is not being used, as of 3.3.0, the files needed are located in binary subdirectory; 
+    arith.js, constants.js, decoder.js, encoder.js, map.js, message.js, reader.js, utils.js, writer.js
 2. The Protocol Compiler `protoc`.  This translates `.proto` files
    into `.js` files.  The compiler is not currently available via
    npm, but you can download a pre-built binary
@@ -93,6 +95,12 @@ statements like:
 
     var message = proto.my.package.MyMessage();
 
+If unfamiliar with Closure or it's compiler, consider reviewing Closure documentation
+https://developers.google.com/closure/library/docs/tutorial
+https://developers.google.com/closure/library/docs/closurebuilder
+https://developers.google.com/closure/library/docs/depswriter
+At a high level, closurebuilder.py can walk dependencies, and compile your code, and all dependencies for Protobuf into a single .js file.  Using depsbuilder.py to generate a dependency file can also be considered for non-production dev environments.
+
 CommonJS imports
 ----------------
 
@@ -150,7 +158,7 @@ idea of how the library generally works:
     message.setPhoneNumbers(["800-555-1212", "800-555-0000"]);
 
     // Serializes to a UInt8Array.
-    bytes = message.serializeBinary();
+    var bytes = message.serializeBinary();
 
     var message2 = MyMessage.deserializeBinary(bytes);
 
diff --git a/js/binary/arith.js b/js/binary/arith.js
index 70257de7..62528a26 100644
--- a/js/binary/arith.js
+++ b/js/binary/arith.js
@@ -221,7 +221,7 @@ jspb.arith.UInt64.prototype.mul = function(a) {
  * Divide a 64-bit number by a 32-bit number to produce a
  * 64-bit quotient and a 32-bit remainder.
  * @param {number} _divisor
- * @return {Array.<jspb.arith.UInt64>} array of [quotient, remainder],
+ * @return {Array<jspb.arith.UInt64>} array of [quotient, remainder],
  * unless divisor is 0, in which case an empty array is returned.
  */
 jspb.arith.UInt64.prototype.div = function(_divisor) {
diff --git a/js/binary/arith_test.js b/js/binary/arith_test.js
index 89796bf7..dd5791a7 100644
--- a/js/binary/arith_test.js
+++ b/js/binary/arith_test.js
@@ -36,7 +36,6 @@
  * @author cfallin@google.com (Chris Fallin)
  */
 
-goog.require('goog.testing.asserts');
 goog.require('jspb.arith.Int64');
 goog.require('jspb.arith.UInt64');
 
@@ -48,30 +47,30 @@ describe('binaryArithTest', function() {
   it('testCompare', function() {
     var a = new jspb.arith.UInt64(1234, 5678);
     var b = new jspb.arith.UInt64(1234, 5678);
-    assertEquals(a.cmp(b), 0);
-    assertEquals(b.cmp(a), 0);
+    expect(a.cmp(b)).toEqual(0);
+    expect(b.cmp(a)).toEqual(0);
     b.lo -= 1;
-    assertEquals(a.cmp(b), 1);
-    assertEquals(b.cmp(a), -1);
+    expect(a.cmp(b)).toEqual(1);
+    expect(b.cmp(a)).toEqual(-1);
     b.lo += 2;
-    assertEquals(a.cmp(b), -1);
-    assertEquals(b.cmp(a), 1);
+    expect(a.cmp(b)).toEqual(-1);
+    expect(b.cmp(a)).toEqual(1);
     b.lo = a.lo;
     b.hi = a.hi - 1;
-    assertEquals(a.cmp(b), 1);
-    assertEquals(b.cmp(a), -1);
+    expect(a.cmp(b)).toEqual(1);
+    expect(b.cmp(a)).toEqual(-1);
 
-    assertEquals(a.zero(), false);
-    assertEquals(a.msb(), false);
-    assertEquals(a.lsb(), false);
+    expect(a.zero()).toEqual(false);
+    expect(a.msb()).toEqual(false);
+    expect(a.lsb()).toEqual(false);
     a.hi = 0;
     a.lo = 0;
-    assertEquals(a.zero(), true);
+    expect(a.zero()).toEqual(true);
     a.hi = 0x80000000;
-    assertEquals(a.zero(), false);
-    assertEquals(a.msb(), true);
+    expect(a.zero()).toEqual(false);
+    expect(a.msb()).toEqual(true);
     a.lo = 0x00000001;
-    assertEquals(a.lsb(), true);
+    expect(a.lsb()).toEqual(true);
   });
 
 
@@ -80,35 +79,35 @@ describe('binaryArithTest', function() {
    */
   it('testShifts', function() {
     var a = new jspb.arith.UInt64(1, 0);
-    assertEquals(a.lo, 1);
-    assertEquals(a.hi, 0);
+    expect(a.lo).toEqual(1);
+    expect(a.hi).toEqual(0);
     var orig = a;
     a = a.leftShift();
-    assertEquals(orig.lo, 1);  // original unmodified.
-    assertEquals(orig.hi, 0);
-    assertEquals(a.lo, 2);
-    assertEquals(a.hi, 0);
+    expect(orig.lo).toEqual(1);  // original unmodified.
+    expect(orig.hi).toEqual(0);
+    expect(a.lo).toEqual(2);
+    expect(a.hi).toEqual(0);
     a = a.leftShift();
-    assertEquals(a.lo, 4);
-    assertEquals(a.hi, 0);
+    expect(a.lo).toEqual(4);
+    expect(a.hi).toEqual(0);
     for (var i = 0; i < 29; i++) {
       a = a.leftShift();
     }
-    assertEquals(a.lo, 0x80000000);
-    assertEquals(a.hi, 0);
+    expect(a.lo).toEqual(0x80000000);
+    expect(a.hi).toEqual(0);
     a = a.leftShift();
-    assertEquals(a.lo, 0);
-    assertEquals(a.hi, 1);
+    expect(a.lo).toEqual(0);
+    expect(a.hi).toEqual(1);
     a = a.leftShift();
-    assertEquals(a.lo, 0);
-    assertEquals(a.hi, 2);
+    expect(a.lo).toEqual(0);
+    expect(a.hi).toEqual(2);
     a = a.rightShift();
     a = a.rightShift();
-    assertEquals(a.lo, 0x80000000);
-    assertEquals(a.hi, 0);
+    expect(a.lo).toEqual(0x80000000);
+    expect(a.hi).toEqual(0);
     a = a.rightShift();
-    assertEquals(a.lo, 0x40000000);
-    assertEquals(a.hi, 0);
+    expect(a.lo).toEqual(0x40000000);
+    expect(a.hi).toEqual(0);
   });
 
 
@@ -122,12 +121,12 @@ describe('binaryArithTest', function() {
                                          /* hi = */ 0x92fa2123);
     // Addition with carry.
     var c = a.add(b);
-    assertEquals(a.lo, 0x89abcdef);  // originals unmodified.
-    assertEquals(a.hi, 0x01234567);
-    assertEquals(b.lo, 0xff52ab91);
-    assertEquals(b.hi, 0x92fa2123);
-    assertEquals(c.lo, 0x88fe7980);
-    assertEquals(c.hi, 0x941d668b);
+    expect(a.lo).toEqual(0x89abcdef);  // originals unmodified.
+    expect(a.hi).toEqual(0x01234567);
+    expect(b.lo).toEqual(0xff52ab91);
+    expect(b.hi).toEqual(0x92fa2123);
+    expect(c.lo).toEqual(0x88fe7980);
+    expect(c.hi).toEqual(0x941d668b);
 
     // Simple addition without carry.
     a.lo = 2;
@@ -135,8 +134,8 @@ describe('binaryArithTest', function() {
     b.lo = 3;
     b.hi = 0;
     c = a.add(b);
-    assertEquals(c.lo, 5);
-    assertEquals(c.hi, 0);
+    expect(c.lo).toEqual(5);
+    expect(c.hi).toEqual(0);
   });
 
 
@@ -170,8 +169,8 @@ describe('binaryArithTest', function() {
         var a = new jspb.arith.UInt64(loValues[i], hiValues[j]);
         var b = new jspb.arith.UInt64(loValues[j], hiValues[i]);
         var c = a.add(b).sub(b);
-        assertEquals(c.hi, a.hi);
-        assertEquals(c.lo, a.lo);
+        expect(c.hi).toEqual(a.hi);
+        expect(c.lo).toEqual(a.lo);
       }
     }
   });
@@ -201,8 +200,8 @@ describe('binaryArithTest', function() {
       var cLow = testData[i][2] >>> 0;
       var cHigh = testData[i][3] >>> 0;
       var c = jspb.arith.UInt64.mul32x32(a, b);
-      assertEquals(c.lo, cLow);
-      assertEquals(c.hi, cHigh);
+      expect(c.lo).toEqual(cLow);
+      expect(c.hi).toEqual(cHigh);
     }
   });
 
@@ -231,8 +230,8 @@ describe('binaryArithTest', function() {
     for (var i = 0; i < testData.length; i++) {
       var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
       var prod = a.mul(testData[i][2]);
-      assertEquals(prod.lo, testData[i][3]);
-      assertEquals(prod.hi, testData[i][4]);
+      expect(prod.lo).toEqual(testData[i][3]);
+      expect(prod.hi).toEqual(testData[i][4]);
     }
   });
 
@@ -274,9 +273,9 @@ describe('binaryArithTest', function() {
       var result = a.div(testData[i][2]);
       var quotient = result[0];
       var remainder = result[1];
-      assertEquals(quotient.lo, testData[i][3]);
-      assertEquals(quotient.hi, testData[i][4]);
-      assertEquals(remainder.lo, testData[i][5]);
+      expect(quotient.lo).toEqual(testData[i][3]);
+      expect(quotient.hi).toEqual(testData[i][4]);
+      expect(remainder.lo).toEqual(testData[i][5]);
     }
   });
 
@@ -311,9 +310,9 @@ describe('binaryArithTest', function() {
     for (var i = 0; i < testData.length; i++) {
       var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
       var roundtrip = jspb.arith.UInt64.fromString(a.toString());
-      assertEquals(roundtrip.lo, a.lo);
-      assertEquals(roundtrip.hi, a.hi);
-      assertEquals(a.toString(), testData[i][2]);
+      expect(roundtrip.lo).toEqual(a.lo);
+      expect(roundtrip.hi).toEqual(a.hi);
+      expect(a.toString()).toEqual(testData[i][2]);
     }
   });
 
@@ -349,7 +348,7 @@ describe('binaryArithTest', function() {
     for (var i = 0; i < testStrings.length; i++) {
       var roundtrip =
           jspb.arith.Int64.fromString(testStrings[i]).toString();
-      assertEquals(roundtrip, testStrings[i]);
+      expect(roundtrip).toEqual(testStrings[i]);
     }
   });
 });
diff --git a/js/binary/constants.js b/js/binary/constants.js
index ef5fecdd..21c5889c 100644
--- a/js/binary/constants.js
+++ b/js/binary/constants.js
@@ -51,20 +51,34 @@ goog.provide('jspb.ScalarFieldType');
 goog.provide('jspb.WriterFunction');
 
 
+goog.forwardDeclare('jspb.BinaryMessage');
+goog.forwardDeclare('jspb.BinaryReader');
+goog.forwardDeclare('jspb.BinaryWriter');
 goog.forwardDeclare('jspb.Message');
 goog.forwardDeclare('jsproto.BinaryExtension');
 
 
 
 /**
- * Base interface class for all const messages. Does __not__ define any
- * methods, as doing so on a widely-used interface defeats dead-code
- * elimination.
+ * Base interface class for all const messages.
  * @interface
  */
 jspb.ConstBinaryMessage = function() {};
 
+/**
+ * Generate a debug string for this proto that is in proto2 text format.
+ * @return {string} The debug string.
+ */
+jspb.ConstBinaryMessage.prototype.toDebugString;
 
+/**
+ * Helper to generate a debug string for this proto at some indent level. The
+ * first line is not indented.
+ * @param {number} indentLevel The number of spaces by which to indent lines.
+ * @return {string} The debug string.
+ * @protected
+ */
+jspb.ConstBinaryMessage.prototype.toDebugStringInternal;
 
 /**
  * Base interface class for all messages. Does __not__ define any methods, as
@@ -94,6 +108,7 @@ jspb.ScalarFieldType;
  * A repeated field in jspb is an array of scalars, blobs, or messages.
  * @typedef {!Array<jspb.ScalarFieldType>|
              !Array<!Uint8Array>|
+             !Array<!jspb.ConstBinaryMessage>|
              !Array<!jspb.BinaryMessage>}
  */
 jspb.RepeatedFieldType;
@@ -105,6 +120,7 @@ jspb.RepeatedFieldType;
  * @typedef {jspb.ScalarFieldType|
              jspb.RepeatedFieldType|
              !Uint8Array|
+             !jspb.ConstBinaryMessage|
              !jspb.BinaryMessage|
              !jsproto.BinaryExtension}
  */
diff --git a/js/binary/decoder.js b/js/binary/decoder.js
index 26bf3594..e33bf1be 100644
--- a/js/binary/decoder.js
+++ b/js/binary/decoder.js
@@ -47,6 +47,7 @@ goog.provide('jspb.BinaryDecoder');
 goog.provide('jspb.BinaryIterator');
 
 goog.require('goog.asserts');
+goog.require('goog.crypt');
 goog.require('jspb.utils');
 
 
@@ -57,7 +58,7 @@ goog.require('jspb.utils');
  * @param {?jspb.BinaryDecoder=} opt_decoder
  * @param {?function(this:jspb.BinaryDecoder):(number|boolean|string)=}
  *     opt_next The decoder method to use for next().
- * @param {?Array.<number|boolean|string>=} opt_elements
+ * @param {?Array<number|boolean|string>=} opt_elements
  * @constructor
  * @struct
  */
@@ -71,7 +72,7 @@ jspb.BinaryIterator = function(opt_decoder, opt_next, opt_elements) {
    */
   this.nextMethod_ = null;
 
-  /** @private {Array.<number>} */
+  /** @private {?Array<number|boolean|string>} */
   this.elements_ = null;
 
   /** @private {number} */
@@ -91,7 +92,7 @@ jspb.BinaryIterator = function(opt_decoder, opt_next, opt_elements) {
  * @param {?jspb.BinaryDecoder=} opt_decoder
  * @param {?function(this:jspb.BinaryDecoder):(number|boolean|string)=}
  *     opt_next The decoder method to use for next().
- * @param {?Array.<number|boolean|string>=} opt_elements
+ * @param {?Array<number|boolean|string>=} opt_elements
  * @private
  */
 jspb.BinaryIterator.prototype.init_ =
@@ -100,7 +101,7 @@ jspb.BinaryIterator.prototype.init_ =
     this.decoder_ = opt_decoder;
     this.nextMethod_ = opt_next;
   }
-  this.elements_ = opt_elements ? opt_elements : null;
+  this.elements_ = opt_elements || null;
   this.cursor_ = 0;
   this.nextValue_ = null;
   this.atEnd_ = !this.decoder_ && !this.elements_;
@@ -111,7 +112,7 @@ jspb.BinaryIterator.prototype.init_ =
 
 /**
  * Global pool of BinaryIterator instances.
- * @private {!Array.<!jspb.BinaryIterator>}
+ * @private {!Array<!jspb.BinaryIterator>}
  */
 jspb.BinaryIterator.instanceCache_ = [];
 
@@ -122,7 +123,7 @@ jspb.BinaryIterator.instanceCache_ = [];
  * @param {?jspb.BinaryDecoder=} opt_decoder
  * @param {?function(this:jspb.BinaryDecoder):(number|boolean|string)=}
  *     opt_next The decoder method to use for next().
- * @param {?Array.<number|boolean|string>=} opt_elements
+ * @param {?Array<number|boolean|string>=} opt_elements
  * @return {!jspb.BinaryIterator}
  */
 jspb.BinaryIterator.alloc = function(opt_decoder, opt_next, opt_elements) {
@@ -273,7 +274,7 @@ jspb.BinaryDecoder = function(opt_bytes, opt_start, opt_length) {
 
 /**
  * Global pool of BinaryDecoder instances.
- * @private {!Array.<!jspb.BinaryDecoder>}
+ * @private {!Array<!jspb.BinaryDecoder>}
  */
 jspb.BinaryDecoder.instanceCache_ = [];
 
@@ -582,27 +583,24 @@ jspb.BinaryDecoder.prototype.readUnsignedVarint32 = function() {
   x |= (temp & 0x0F) << 28;
   if (temp < 128) {
     // We're reading the high bits of an unsigned varint. The byte we just read
-    // also contains bits 33 through 35, which we're going to discard. Those
-    // bits _must_ be zero, or the encoding is invalid.
-    goog.asserts.assert((temp & 0xF0) == 0);
+    // also contains bits 33 through 35, which we're going to discard.
     this.cursor_ += 5;
     goog.asserts.assert(this.cursor_ <= this.end_);
     return x >>> 0;
   }
 
-  // If we get here, we're reading the sign extension of a negative 32-bit int.
-  // We can skip these bytes, as we know in advance that they have to be all
-  // 1's if the varint is correctly encoded. Since we also know the value is
-  // negative, we don't have to coerce it to unsigned before we return it.
-
-  goog.asserts.assert((temp & 0xF0) == 0xF0);
-  goog.asserts.assert(bytes[this.cursor_ + 5] == 0xFF);
-  goog.asserts.assert(bytes[this.cursor_ + 6] == 0xFF);
-  goog.asserts.assert(bytes[this.cursor_ + 7] == 0xFF);
-  goog.asserts.assert(bytes[this.cursor_ + 8] == 0xFF);
-  goog.asserts.assert(bytes[this.cursor_ + 9] == 0x01);
+  // If we get here, we need to truncate coming bytes. However we need to make
+  // sure cursor place is correct.
+  this.cursor_ += 5;
+  if (bytes[this.cursor_++] >= 128 &&
+      bytes[this.cursor_++] >= 128 &&
+      bytes[this.cursor_++] >= 128 &&
+      bytes[this.cursor_++] >= 128 &&
+      bytes[this.cursor_++] >= 128) {
+    // If we get here, the varint is too long.
+    goog.asserts.assert(false);
+  }
 
-  this.cursor_ += 10;
   goog.asserts.assert(this.cursor_ <= this.end_);
   return x;
 };
@@ -953,6 +951,7 @@ jspb.BinaryDecoder.prototype.readString = function(length) {
   var end = cursor + length;
   var codeUnits = [];
 
+  var result = '';
   while (cursor < end) {
     var c = bytes[cursor++];
     if (c < 128) { // Regular 7-bit ASCII.
@@ -973,7 +972,7 @@ jspb.BinaryDecoder.prototype.readString = function(length) {
       var c2 = bytes[cursor++];
       var c3 = bytes[cursor++];
       var c4 = bytes[cursor++];
-      // Characters written on 4 bytes have 21 bits for a codepoint. 
+      // Characters written on 4 bytes have 21 bits for a codepoint.
       // We can't fit that on 16bit characters, so we use surrogates.
       var codepoint = ((c & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63);
       // Surrogates formula from wikipedia.
@@ -986,10 +985,14 @@ jspb.BinaryDecoder.prototype.readString = function(length) {
       var high = ((codepoint >> 10) & 1023) + 0xD800;
       codeUnits.push(high, low);
     }
+
+    // Avoid exceeding the maximum stack size when calling `apply`.
+    if (codeUnits.length >= 8192) {
+      result += String.fromCharCode.apply(null, codeUnits);
+      codeUnits.length = 0;
+    }
   }
-  // String.fromCharCode.apply is faster than manually appending characters on
-  // Chrome 25+, and generates no additional cons string garbage.
-  var result = String.fromCharCode.apply(null, codeUnits);
+  result += goog.crypt.byteArrayToString(codeUnits);
   this.cursor_ = cursor;
   return result;
 };
diff --git a/js/binary/decoder_test.js b/js/binary/decoder_test.js
index cb8aff96..b19e1d1b 100644
--- a/js/binary/decoder_test.js
+++ b/js/binary/decoder_test.js
@@ -211,6 +211,25 @@ describe('binaryDecoderTest', function() {
   });
 
   /**
+   * Tests reading and writing large strings
+   */
+  it('testLargeStrings', function() {
+    var encoder = new jspb.BinaryEncoder();
+
+    var len = 150000;
+    var long_string = '';
+    for (var i = 0; i < len; i++) {
+      long_string += 'a';
+    }
+
+    encoder.writeString(long_string);
+
+    var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+    assertEquals(long_string, decoder.readString(len));
+  });
+
+  /**
    * Test encoding and decoding utf-8.
    */
    it('testUtf8', function() {
@@ -251,24 +270,7 @@ describe('binaryDecoderTest', function() {
     assertThrows(function() {decoder.readSignedVarint64()});
     decoder.reset();
     assertThrows(function() {decoder.readZigzagVarint64()});
-
-    // Positive 32-bit varints encoded with 1 bits in positions 33 through 35
-    // should trigger assertions.
-    decoder.setBlock([255, 255, 255, 255, 0x1F]);
-    assertThrows(function() {decoder.readUnsignedVarint32()});
-
-    decoder.setBlock([255, 255, 255, 255, 0x2F]);
-    assertThrows(function() {decoder.readUnsignedVarint32()});
-
-    decoder.setBlock([255, 255, 255, 255, 0x4F]);
-    assertThrows(function() {decoder.readUnsignedVarint32()});
-
-    // Negative 32-bit varints encoded with non-1 bits in the high dword should
-    // trigger assertions.
-    decoder.setBlock([255, 255, 255, 255, 255, 255, 0, 255, 255, 1]);
-    assertThrows(function() {decoder.readUnsignedVarint32()});
-
-    decoder.setBlock([255, 255, 255, 255, 255, 255, 255, 255, 255, 0]);
+    decoder.reset();
     assertThrows(function() {decoder.readUnsignedVarint32()});
   });
 
diff --git a/js/binary/encoder.js b/js/binary/encoder.js
index aee33e7e..b2013f63 100644
--- a/js/binary/encoder.js
+++ b/js/binary/encoder.js
@@ -51,7 +51,7 @@ goog.require('jspb.utils');
  * @struct
  */
 jspb.BinaryEncoder = function() {
-  /** @private {!Array.<number>} */
+  /** @private {!Array<number>} */
   this.buffer_ = [];
 };
 
@@ -65,7 +65,7 @@ jspb.BinaryEncoder.prototype.length = function() {
 
 
 /**
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryEncoder.prototype.end = function() {
   var buffer = this.buffer_;
@@ -355,8 +355,8 @@ jspb.BinaryEncoder.prototype.writeInt64 = function(value) {
  */
 jspb.BinaryEncoder.prototype.writeInt64String = function(value) {
   goog.asserts.assert(value == Math.floor(value));
-  goog.asserts.assert((value >= -jspb.BinaryConstants.TWO_TO_63) &&
-                      (value < jspb.BinaryConstants.TWO_TO_63));
+  goog.asserts.assert((+value >= -jspb.BinaryConstants.TWO_TO_63) &&
+                      (+value < jspb.BinaryConstants.TWO_TO_63));
   jspb.utils.splitHash64(jspb.utils.decimalStringToHash64(value));
   this.writeSplitFixed64(jspb.utils.split64Low, jspb.utils.split64High);
 };
@@ -390,11 +390,13 @@ jspb.BinaryEncoder.prototype.writeDouble = function(value) {
 
 
 /**
- * Writes a boolean value to the buffer as a varint.
- * @param {boolean} value The value to write.
+ * Writes a boolean value to the buffer as a varint. We allow numbers as input
+ * because the JSPB code generator uses 0/1 instead of true/false to save space
+ * in the string representation of the proto.
+ * @param {boolean|number} value The value to write.
  */
 jspb.BinaryEncoder.prototype.writeBool = function(value) {
-  goog.asserts.assert(goog.isBoolean(value));
+  goog.asserts.assert(goog.isBoolean(value) || goog.isNumber(value));
   this.buffer_.push(value ? 1 : 0);
 };
 
diff --git a/js/binary/proto_test.js b/js/binary/proto_test.js
index f86dc645..f5e1b6bb 100644
--- a/js/binary/proto_test.js
+++ b/js/binary/proto_test.js
@@ -283,8 +283,7 @@ function checkAllFields(original, copy) {
  * @param {!proto.jspb.test.TestExtendable} msg
  */
 function checkExtensions(msg) {
-  assertEquals(-42,
-      msg.getExtension(proto.jspb.test.extendOptionalInt32));
+  assertEquals(0, msg.getExtension(proto.jspb.test.extendOptionalInt32));
   assertEquals(-0x7fffffff00000000,
       msg.getExtension(proto.jspb.test.extendOptionalInt64));
   assertEquals(0x80000000,
@@ -512,8 +511,7 @@ describe('protoBinaryTest', function() {
    * @param {proto.jspb.test.TestExtendable} msg
    */
   function fillExtensions(msg) {
-    msg.setExtension(
-        proto.jspb.test.extendOptionalInt32, -42);
+    msg.setExtension(proto.jspb.test.extendOptionalInt32, 0);
     msg.setExtension(
         proto.jspb.test.extendOptionalInt64, -0x7fffffff00000000);
     msg.setExtension(
diff --git a/js/binary/reader.js b/js/binary/reader.js
index 8c5a4e88..2dc3eb70 100644
--- a/js/binary/reader.js
+++ b/js/binary/reader.js
@@ -97,7 +97,7 @@ jspb.BinaryReader = function(opt_bytes, opt_start, opt_length) {
 
   /**
    * User-defined reader callbacks.
-   * @private {Object.<string, function(!jspb.BinaryReader):*>}
+   * @private {Object<string, function(!jspb.BinaryReader):*>}
    */
   this.readCallbacks_ = null;
 };
@@ -105,7 +105,7 @@ jspb.BinaryReader = function(opt_bytes, opt_start, opt_length) {
 
 /**
  * Global pool of BinaryReader instances.
- * @private {!Array.<!jspb.BinaryReader>}
+ * @private {!Array<!jspb.BinaryReader>}
  */
 jspb.BinaryReader.instanceCache_ = [];
 
@@ -971,7 +971,7 @@ jspb.BinaryReader.prototype.readFixedHash64 = function() {
 
 /**
  * Reads a packed scalar field using the supplied raw reader function.
- * @param {function()} decodeMethod
+ * @param {function(this:jspb.BinaryDecoder)} decodeMethod
  * @return {!Array}
  * @private
  */
@@ -992,7 +992,7 @@ jspb.BinaryReader.prototype.readPackedField_ = function(decodeMethod) {
 /**
  * Reads a packed int32 field, which consists of a length header and a list of
  * signed varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedInt32 = function() {
   return this.readPackedField_(this.decoder_.readSignedVarint32);
@@ -1002,7 +1002,7 @@ jspb.BinaryReader.prototype.readPackedInt32 = function() {
 /**
  * Reads a packed int32 field, which consists of a length header and a list of
  * signed varints. Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedInt32String = function() {
   return this.readPackedField_(this.decoder_.readSignedVarint32String);
@@ -1012,7 +1012,7 @@ jspb.BinaryReader.prototype.readPackedInt32String = function() {
 /**
  * Reads a packed int64 field, which consists of a length header and a list of
  * signed varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedInt64 = function() {
   return this.readPackedField_(this.decoder_.readSignedVarint64);
@@ -1022,7 +1022,7 @@ jspb.BinaryReader.prototype.readPackedInt64 = function() {
 /**
  * Reads a packed int64 field, which consists of a length header and a list of
  * signed varints. Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedInt64String = function() {
   return this.readPackedField_(this.decoder_.readSignedVarint64String);
@@ -1032,7 +1032,7 @@ jspb.BinaryReader.prototype.readPackedInt64String = function() {
 /**
  * Reads a packed uint32 field, which consists of a length header and a list of
  * unsigned varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedUint32 = function() {
   return this.readPackedField_(this.decoder_.readUnsignedVarint32);
@@ -1042,7 +1042,7 @@ jspb.BinaryReader.prototype.readPackedUint32 = function() {
 /**
  * Reads a packed uint32 field, which consists of a length header and a list of
  * unsigned varints. Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedUint32String = function() {
   return this.readPackedField_(this.decoder_.readUnsignedVarint32String);
@@ -1052,7 +1052,7 @@ jspb.BinaryReader.prototype.readPackedUint32String = function() {
 /**
  * Reads a packed uint64 field, which consists of a length header and a list of
  * unsigned varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedUint64 = function() {
   return this.readPackedField_(this.decoder_.readUnsignedVarint64);
@@ -1062,7 +1062,7 @@ jspb.BinaryReader.prototype.readPackedUint64 = function() {
 /**
  * Reads a packed uint64 field, which consists of a length header and a list of
  * unsigned varints. Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedUint64String = function() {
   return this.readPackedField_(this.decoder_.readUnsignedVarint64String);
@@ -1072,7 +1072,7 @@ jspb.BinaryReader.prototype.readPackedUint64String = function() {
 /**
  * Reads a packed sint32 field, which consists of a length header and a list of
  * zigzag varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedSint32 = function() {
   return this.readPackedField_(this.decoder_.readZigzagVarint32);
@@ -1082,7 +1082,7 @@ jspb.BinaryReader.prototype.readPackedSint32 = function() {
 /**
  * Reads a packed sint64 field, which consists of a length header and a list of
  * zigzag varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedSint64 = function() {
   return this.readPackedField_(this.decoder_.readZigzagVarint64);
@@ -1092,7 +1092,7 @@ jspb.BinaryReader.prototype.readPackedSint64 = function() {
 /**
  * Reads a packed sint64 field, which consists of a length header and a list of
  * zigzag varints.  Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedSint64String = function() {
   return this.readPackedField_(this.decoder_.readZigzagVarint64String);
@@ -1102,7 +1102,7 @@ jspb.BinaryReader.prototype.readPackedSint64String = function() {
 /**
  * Reads a packed fixed32 field, which consists of a length header and a list
  * of unsigned 32-bit ints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedFixed32 = function() {
   return this.readPackedField_(this.decoder_.readUint32);
@@ -1112,7 +1112,7 @@ jspb.BinaryReader.prototype.readPackedFixed32 = function() {
 /**
  * Reads a packed fixed64 field, which consists of a length header and a list
  * of unsigned 64-bit ints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedFixed64 = function() {
   return this.readPackedField_(this.decoder_.readUint64);
@@ -1122,7 +1122,7 @@ jspb.BinaryReader.prototype.readPackedFixed64 = function() {
 /**
  * Reads a packed fixed64 field, which consists of a length header and a list
  * of unsigned 64-bit ints.  Returns a list of strings.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedFixed64String = function() {
   return this.readPackedField_(this.decoder_.readUint64String);
@@ -1132,7 +1132,7 @@ jspb.BinaryReader.prototype.readPackedFixed64String = function() {
 /**
  * Reads a packed sfixed32 field, which consists of a length header and a list
  * of 32-bit ints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedSfixed32 = function() {
   return this.readPackedField_(this.decoder_.readInt32);
@@ -1142,7 +1142,7 @@ jspb.BinaryReader.prototype.readPackedSfixed32 = function() {
 /**
  * Reads a packed sfixed64 field, which consists of a length header and a list
  * of 64-bit ints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedSfixed64 = function() {
   return this.readPackedField_(this.decoder_.readInt64);
@@ -1152,7 +1152,7 @@ jspb.BinaryReader.prototype.readPackedSfixed64 = function() {
 /**
  * Reads a packed sfixed64 field, which consists of a length header and a list
  * of 64-bit ints.  Returns a list of strings.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedSfixed64String = function() {
   return this.readPackedField_(this.decoder_.readInt64String);
@@ -1162,7 +1162,7 @@ jspb.BinaryReader.prototype.readPackedSfixed64String = function() {
 /**
  * Reads a packed float field, which consists of a length header and a list of
  * floats.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedFloat = function() {
   return this.readPackedField_(this.decoder_.readFloat);
@@ -1172,7 +1172,7 @@ jspb.BinaryReader.prototype.readPackedFloat = function() {
 /**
  * Reads a packed double field, which consists of a length header and a list of
  * doubles.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedDouble = function() {
   return this.readPackedField_(this.decoder_.readDouble);
@@ -1182,7 +1182,7 @@ jspb.BinaryReader.prototype.readPackedDouble = function() {
 /**
  * Reads a packed bool field, which consists of a length header and a list of
  * unsigned varints.
- * @return {!Array.<boolean>}
+ * @return {!Array<boolean>}
  */
 jspb.BinaryReader.prototype.readPackedBool = function() {
   return this.readPackedField_(this.decoder_.readBool);
@@ -1192,7 +1192,7 @@ jspb.BinaryReader.prototype.readPackedBool = function() {
 /**
  * Reads a packed enum field, which consists of a length header and a list of
  * unsigned varints.
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  */
 jspb.BinaryReader.prototype.readPackedEnum = function() {
   return this.readPackedField_(this.decoder_.readEnum);
@@ -1202,7 +1202,7 @@ jspb.BinaryReader.prototype.readPackedEnum = function() {
 /**
  * Reads a packed varint hash64 field, which consists of a length header and a
  * list of varint hash64s.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedVarintHash64 = function() {
   return this.readPackedField_(this.decoder_.readVarintHash64);
@@ -1212,7 +1212,7 @@ jspb.BinaryReader.prototype.readPackedVarintHash64 = function() {
 /**
  * Reads a packed fixed hash64 field, which consists of a length header and a
  * list of fixed hash64s.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.BinaryReader.prototype.readPackedFixedHash64 = function() {
   return this.readPackedField_(this.decoder_.readFixedHash64);
diff --git a/js/binary/utils.js b/js/binary/utils.js
index bbf99cdf..55a9ccd4 100644
--- a/js/binary/utils.js
+++ b/js/binary/utils.js
@@ -38,6 +38,7 @@
 goog.provide('jspb.utils');
 
 goog.require('goog.asserts');
+goog.require('goog.crypt');
 goog.require('goog.crypt.base64');
 goog.require('goog.string');
 goog.require('jspb.BinaryConstants');
@@ -430,7 +431,7 @@ jspb.utils.joinHash64 = function(bitsLow, bitsHigh) {
 
 /**
  * Individual digits for number->string conversion.
- * @const {!Array.<number>}
+ * @const {!Array<string>}
  */
 jspb.utils.DIGITS = [
   '0', '1', '2', '3', '4', '5', '6', '7',
@@ -553,10 +554,10 @@ jspb.utils.hash64ToDecimalString = function(hash, signed) {
 /**
  * Converts an array of 8-character hash strings into their decimal
  * representations.
- * @param {!Array.<string>} hashes The array of hash strings to convert.
+ * @param {!Array<string>} hashes The array of hash strings to convert.
  * @param {boolean} signed True if we should treat the hash string as encoding
  *     a signed integer.
- * @return {!Array.<string>}
+ * @return {!Array<string>}
  */
 jspb.utils.hash64ArrayToDecimalStrings = function(hashes, signed) {
   var result = new Array(hashes.length);
@@ -613,7 +614,7 @@ jspb.utils.decimalStringToHash64 = function(dec) {
     muladd(1, 1);
   }
 
-  return String.fromCharCode.apply(null, resultBytes);
+  return goog.crypt.byteArrayToString(resultBytes);
 };
 
 
@@ -970,8 +971,12 @@ jspb.utils.byteSourceToUint8Array = function(data) {
     return /** @type {!Uint8Array} */(new Uint8Array(data));
   }
 
+  if (data.constructor === Buffer) {
+    return /** @type {!Uint8Array} */(new Uint8Array(data));
+  }
+
   if (data.constructor === Array) {
-    data = /** @type {!Array.<number>} */(data);
+    data = /** @type {!Array<number>} */(data);
     return /** @type {!Uint8Array} */(new Uint8Array(data));
   }
 
diff --git a/js/binary/utils_test.js b/js/binary/utils_test.js
index d27e5ea2..13450644 100644
--- a/js/binary/utils_test.js
+++ b/js/binary/utils_test.js
@@ -36,6 +36,7 @@
  * @author aappleby@google.com (Austin Appleby)
  */
 
+goog.require('goog.crypt');
 goog.require('goog.crypt.base64');
 goog.require('goog.testing.asserts');
 goog.require('jspb.BinaryConstants');
@@ -205,31 +206,31 @@ describe('binaryUtilsTest', function() {
     var convert = jspb.utils.decimalStringToHash64;
 
     result = convert('0');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
 
     result = convert('-1');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
 
     result = convert('18446744073709551615');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
 
     result = convert('9223372036854775808');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
 
     result = convert('-9223372036854775808');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
 
     result = convert('123456789123456789');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0x15, 0x5F, 0xD0, 0xAC, 0x4B, 0x9B, 0xB6, 0x01]), result);
 
     result = convert('-123456789123456789');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
       [0xEB, 0xA0, 0x2F, 0x53, 0xB4, 0x64, 0x49, 0xFE]), result);
   });
 
@@ -259,21 +260,21 @@ describe('binaryUtilsTest', function() {
     var convert = jspb.utils.hexStringToHash64;
 
     result = convert('0x0000000000000000');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
         [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
 
     result = convert('0xffffffffffffffff');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
         [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
 
     // Hex string is big-endian, hash string is little-endian.
     result = convert('0x123456789ABCDEF0');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
         [0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12]), result);
 
     // Capitalization should not matter.
     result = convert('0x0000abcdefABCDEF');
-    assertEquals(String.fromCharCode.apply(null,
+    assertEquals(goog.crypt.byteArrayToString(
         [0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB, 0x00, 0x00]), result);
   });
 
@@ -643,7 +644,7 @@ describe('binaryUtilsTest', function() {
     var sourceBytes = new Uint8Array(sourceData);
     var sourceBuffer = sourceBytes.buffer;
     var sourceBase64 = goog.crypt.base64.encodeByteArray(sourceData);
-    var sourceString = String.fromCharCode.apply(null, sourceData);
+    var sourceString = goog.crypt.byteArrayToString(sourceData);
 
     function check(result) {
       assertEquals(Uint8Array, result.constructor);
@@ -656,7 +657,7 @@ describe('binaryUtilsTest', function() {
     // Converting Uint8Arrays into Uint8Arrays should be a no-op.
     assertEquals(sourceBytes, convert(sourceBytes));
 
-    // Converting Array.<numbers> into Uint8Arrays should work.
+    // Converting Array<numbers> into Uint8Arrays should work.
     check(convert(sourceData));
 
     // Converting ArrayBuffers into Uint8Arrays should work.
diff --git a/js/binary/writer.js b/js/binary/writer.js
index c3009dbb..287d29c3 100644
--- a/js/binary/writer.js
+++ b/js/binary/writer.js
@@ -102,7 +102,7 @@ jspb.BinaryWriter = function() {
    * A stack of bookmarks containing the parent blocks for each message started
    * via beginSubMessage(), needed as bookkeeping for endSubMessage().
    * TODO(aappleby): Deprecated, users should be calling writeMessage().
-   * @private {!Array.<!Array.<number>>}
+   * @private {!Array<!Array<number>>}
    */
   this.bookmarks_ = [];
 };
@@ -126,7 +126,7 @@ jspb.BinaryWriter.prototype.appendUint8Array_ = function(arr) {
  * Begins a new message by writing the field header and returning a bookmark
  * which we will use to patch in the message length to in endDelimited_ below.
  * @param {number} field
- * @return {!Array.<number>}
+ * @return {!Array<number>}
  * @private
  */
 jspb.BinaryWriter.prototype.beginDelimited_ = function(field) {
@@ -143,7 +143,7 @@ jspb.BinaryWriter.prototype.beginDelimited_ = function(field) {
  * Ends a message by encoding the _change_ in length of the buffer to the
  * parent block and adds the number of bytes needed to encode that length to
  * the total byte length.
- * @param {!Array.<number>} bookmark
+ * @param {!Array<number>} bookmark
  * @private
  */
 jspb.BinaryWriter.prototype.endDelimited_ = function(bookmark) {
@@ -235,11 +235,13 @@ jspb.BinaryWriter.prototype.getResultBuffer = function() {
 
 
 /**
- * Converts the encoded data into a bas64-encoded string.
+ * Converts the encoded data into a base64-encoded string.
+ * @param {boolean=} opt_webSafe True indicates we should use a websafe
+ *     alphabet, which does not require escaping for use in URLs.
  * @return {string}
  */
-jspb.BinaryWriter.prototype.getResultBase64String = function() {
-  return goog.crypt.base64.encodeByteArray(this.getResultBuffer());
+jspb.BinaryWriter.prototype.getResultBase64String = function(opt_webSafe) {
+  return goog.crypt.base64.encodeByteArray(this.getResultBuffer(), opt_webSafe);
 };
 
 
@@ -596,8 +598,8 @@ jspb.BinaryWriter.prototype.writeSint64 = function(field, value) {
  */
 jspb.BinaryWriter.prototype.writeSint64String = function(field, value) {
   if (value == null) return;
-  goog.asserts.assert((value >= -jspb.BinaryConstants.TWO_TO_63) &&
-                      (value < jspb.BinaryConstants.TWO_TO_63));
+  goog.asserts.assert((+value >= -jspb.BinaryConstants.TWO_TO_63) &&
+                      (+value < jspb.BinaryConstants.TWO_TO_63));
   this.writeZigzagVarint64String_(field, value);
 };
 
@@ -716,13 +718,15 @@ jspb.BinaryWriter.prototype.writeDouble = function(field, value) {
 
 
 /**
- * Writes a boolean field to the buffer.
+ * Writes a boolean field to the buffer. We allow numbers as input
+ * because the JSPB code generator uses 0/1 instead of true/false to save space
+ * in the string representation of the proto.
  * @param {number} field The field number.
- * @param {boolean?} value The value to write.
+ * @param {boolean?|number?} value The value to write.
  */
 jspb.BinaryWriter.prototype.writeBool = function(field, value) {
   if (value == null) return;
-  goog.asserts.assert(goog.isBoolean(value));
+  goog.asserts.assert(goog.isBoolean(value) || goog.isNumber(value));
   this.writeFieldHeader_(field, jspb.BinaryConstants.WireType.VARINT);
   this.encoder_.writeBool(value);
 };
@@ -853,7 +857,7 @@ jspb.BinaryWriter.prototype.writeVarintHash64 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a repeated 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedInt32 = function(field, value) {
   if (value == null) return;
@@ -867,7 +871,7 @@ jspb.BinaryWriter.prototype.writeRepeatedInt32 = function(field, value) {
  * Writes an array of numbers formatted as strings to the buffer as a repeated
  * 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of ints to write.
+ * @param {?Array<string>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedInt32String = function(field, value) {
   if (value == null) return;
@@ -880,7 +884,7 @@ jspb.BinaryWriter.prototype.writeRepeatedInt32String = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a repeated 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedInt64 = function(field, value) {
   if (value == null) return;
@@ -894,7 +898,7 @@ jspb.BinaryWriter.prototype.writeRepeatedInt64 = function(field, value) {
  * Writes an array of numbers formatted as strings to the buffer as a repeated
  * 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of ints to write.
+ * @param {?Array<string>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedInt64String = function(field, value) {
   if (value == null) return;
@@ -908,7 +912,7 @@ jspb.BinaryWriter.prototype.writeRepeatedInt64String = function(field, value) {
  * Writes an array numbers to the buffer as a repeated unsigned 32-bit int
  *     field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedUint32 = function(field, value) {
   if (value == null) return;
@@ -922,7 +926,7 @@ jspb.BinaryWriter.prototype.writeRepeatedUint32 = function(field, value) {
  * Writes an array of numbers formatted as strings to the buffer as a repeated
  * unsigned 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of ints to write.
+ * @param {?Array<string>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedUint32String = function(field, value) {
   if (value == null) return;
@@ -936,7 +940,7 @@ jspb.BinaryWriter.prototype.writeRepeatedUint32String = function(field, value) {
  * Writes an array numbers to the buffer as a repeated unsigned 64-bit int
  *     field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedUint64 = function(field, value) {
   if (value == null) return;
@@ -950,7 +954,7 @@ jspb.BinaryWriter.prototype.writeRepeatedUint64 = function(field, value) {
  * Writes an array of numbers formatted as strings to the buffer as a repeated
  * unsigned 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of ints to write.
+ * @param {?Array<string>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedUint64String = function(field, value) {
   if (value == null) return;
@@ -963,7 +967,7 @@ jspb.BinaryWriter.prototype.writeRepeatedUint64String = function(field, value) {
 /**
  * Writes an array numbers to the buffer as a repeated signed 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSint32 = function(field, value) {
   if (value == null) return;
@@ -976,7 +980,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSint32 = function(field, value) {
 /**
  * Writes an array numbers to the buffer as a repeated signed 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSint64 = function(field, value) {
   if (value == null) return;
@@ -989,7 +993,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSint64 = function(field, value) {
 /**
  * Writes an array numbers to the buffer as a repeated signed 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of ints to write.
+ * @param {?Array<string>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSint64String = function(field, value) {
   if (value == null) return;
@@ -1003,7 +1007,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSint64String = function(field, value) {
  * Writes an array of numbers to the buffer as a repeated fixed32 field. This
  * works for both signed and unsigned fixed32s.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedFixed32 = function(field, value) {
   if (value == null) return;
@@ -1017,7 +1021,7 @@ jspb.BinaryWriter.prototype.writeRepeatedFixed32 = function(field, value) {
  * Writes an array of numbers to the buffer as a repeated fixed64 field. This
  * works for both signed and unsigned fixed64s.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedFixed64 = function(field, value) {
   if (value == null) return;
@@ -1031,7 +1035,7 @@ jspb.BinaryWriter.prototype.writeRepeatedFixed64 = function(field, value) {
  * Writes an array of numbers to the buffer as a repeated fixed64 field. This
  * works for both signed and unsigned fixed64s.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of decimal strings to write.
+ * @param {?Array<string>} value The array of decimal strings to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedFixed64String = function(
     field, value) {
@@ -1045,7 +1049,7 @@ jspb.BinaryWriter.prototype.writeRepeatedFixed64String = function(
 /**
  * Writes an array of numbers to the buffer as a repeated sfixed32 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSfixed32 = function(field, value) {
   if (value == null) return;
@@ -1058,7 +1062,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSfixed32 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a repeated sfixed64 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSfixed64 = function(field, value) {
   if (value == null) return;
@@ -1072,7 +1076,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSfixed64 = function(field, value) {
  * Writes an array of decimal strings to the buffer as a repeated sfixed64
  * field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of decimal strings to write.
+ * @param {?Array<string>} value The array of decimal strings to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedSfixed64String = function(field, value) {
   if (value == null) return;
@@ -1085,7 +1089,7 @@ jspb.BinaryWriter.prototype.writeRepeatedSfixed64String = function(field, value)
 /**
  * Writes an array of numbers to the buffer as a repeated float field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedFloat = function(field, value) {
   if (value == null) return;
@@ -1098,7 +1102,7 @@ jspb.BinaryWriter.prototype.writeRepeatedFloat = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a repeated double field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedDouble = function(field, value) {
   if (value == null) return;
@@ -1111,7 +1115,7 @@ jspb.BinaryWriter.prototype.writeRepeatedDouble = function(field, value) {
 /**
  * Writes an array of booleans to the buffer as a repeated bool field.
  * @param {number} field The field number.
- * @param {?Array.<boolean>} value The array of ints to write.
+ * @param {?Array<boolean>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedBool = function(field, value) {
   if (value == null) return;
@@ -1124,7 +1128,7 @@ jspb.BinaryWriter.prototype.writeRepeatedBool = function(field, value) {
 /**
  * Writes an array of enums to the buffer as a repeated enum field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedEnum = function(field, value) {
   if (value == null) return;
@@ -1137,7 +1141,7 @@ jspb.BinaryWriter.prototype.writeRepeatedEnum = function(field, value) {
 /**
  * Writes an array of strings to the buffer as a repeated string field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of strings to write.
+ * @param {?Array<string>} value The array of strings to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedString = function(field, value) {
   if (value == null) return;
@@ -1150,7 +1154,7 @@ jspb.BinaryWriter.prototype.writeRepeatedString = function(field, value) {
 /**
  * Writes an array of arbitrary byte fields to the buffer.
  * @param {number} field The field number.
- * @param {?Array.<!jspb.ByteSource>} value The arrays of arrays of bytes to
+ * @param {?Array<!jspb.ByteSource>} value The arrays of arrays of bytes to
  *     write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedBytes = function(field, value) {
@@ -1165,7 +1169,7 @@ jspb.BinaryWriter.prototype.writeRepeatedBytes = function(field, value) {
  * Writes an array of messages to the buffer.
  * @template MessageType
  * @param {number} field The field number.
- * @param {?Array.<MessageType>} value The array of messages to
+ * @param {?Array<MessageType>} value The array of messages to
  *    write.
  * @param {function(MessageType, !jspb.BinaryWriter)} writerCallback
  *     Will be invoked with the value to write and the writer to write it with.
@@ -1185,7 +1189,7 @@ jspb.BinaryWriter.prototype.writeRepeatedMessage = function(
  * Writes an array of group messages to the buffer.
  * @template MessageType
  * @param {number} field The field number.
- * @param {?Array.<MessageType>} value The array of messages to
+ * @param {?Array<MessageType>} value The array of messages to
  *    write.
  * @param {function(MessageType, !jspb.BinaryWriter)} writerCallback
  *     Will be invoked with the value to write and the writer to write it with.
@@ -1205,7 +1209,7 @@ jspb.BinaryWriter.prototype.writeRepeatedGroup = function(
  * Writes a 64-bit hash string field (8 characters @ 8 bits of data each) to
  * the buffer.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of hashes to write.
+ * @param {?Array<string>} value The array of hashes to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedFixedHash64 =
     function(field, value) {
@@ -1220,7 +1224,7 @@ jspb.BinaryWriter.prototype.writeRepeatedFixedHash64 =
  * Writes a repeated 64-bit hash string field (8 characters @ 8 bits of data
  * each) to the buffer.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of hashes to write.
+ * @param {?Array<string>} value The array of hashes to write.
  */
 jspb.BinaryWriter.prototype.writeRepeatedVarintHash64 =
     function(field, value) {
@@ -1234,7 +1238,7 @@ jspb.BinaryWriter.prototype.writeRepeatedVarintHash64 =
 /**
  * Writes an array of numbers to the buffer as a packed 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedInt32 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1250,7 +1254,7 @@ jspb.BinaryWriter.prototype.writePackedInt32 = function(field, value) {
  * Writes an array of numbers represented as strings to the buffer as a packed
  * 32-bit int field.
  * @param {number} field
- * @param {?Array.<string>} value
+ * @param {?Array<string>} value
  */
 jspb.BinaryWriter.prototype.writePackedInt32String = function(field, value) {
   if (value == null || !value.length) return;
@@ -1265,7 +1269,7 @@ jspb.BinaryWriter.prototype.writePackedInt32String = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedInt64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1281,7 +1285,7 @@ jspb.BinaryWriter.prototype.writePackedInt64 = function(field, value) {
  * Writes an array of numbers represented as strings to the buffer as a packed
  * 64-bit int field.
  * @param {number} field
- * @param {?Array.<string>} value
+ * @param {?Array<string>} value
  */
 jspb.BinaryWriter.prototype.writePackedInt64String = function(field, value) {
   if (value == null || !value.length) return;
@@ -1297,7 +1301,7 @@ jspb.BinaryWriter.prototype.writePackedInt64String = function(field, value) {
 /**
  * Writes an array numbers to the buffer as a packed unsigned 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedUint32 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1313,7 +1317,7 @@ jspb.BinaryWriter.prototype.writePackedUint32 = function(field, value) {
  * Writes an array of numbers represented as strings to the buffer as a packed
  * unsigned 32-bit int field.
  * @param {number} field
- * @param {?Array.<string>} value
+ * @param {?Array<string>} value
  */
 jspb.BinaryWriter.prototype.writePackedUint32String =
     function(field, value) {
@@ -1329,7 +1333,7 @@ jspb.BinaryWriter.prototype.writePackedUint32String =
 /**
  * Writes an array numbers to the buffer as a packed unsigned 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedUint64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1345,7 +1349,7 @@ jspb.BinaryWriter.prototype.writePackedUint64 = function(field, value) {
  * Writes an array of numbers represented as strings to the buffer as a packed
  * unsigned 64-bit int field.
  * @param {number} field
- * @param {?Array.<string>} value
+ * @param {?Array<string>} value
  */
 jspb.BinaryWriter.prototype.writePackedUint64String =
     function(field, value) {
@@ -1362,7 +1366,7 @@ jspb.BinaryWriter.prototype.writePackedUint64String =
 /**
  * Writes an array numbers to the buffer as a packed signed 32-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedSint32 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1377,7 +1381,7 @@ jspb.BinaryWriter.prototype.writePackedSint32 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed signed 64-bit int field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedSint64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1393,7 +1397,7 @@ jspb.BinaryWriter.prototype.writePackedSint64 = function(field, value) {
  * Writes an array of decimal strings to the buffer as a packed signed 64-bit
  * int field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of decimal strings to write.
+ * @param {?Array<string>} value The array of decimal strings to write.
  */
 jspb.BinaryWriter.prototype.writePackedSint64String = function(field, value) {
   if (value == null || !value.length) return;
@@ -1409,7 +1413,7 @@ jspb.BinaryWriter.prototype.writePackedSint64String = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed fixed32 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedFixed32 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1424,7 +1428,7 @@ jspb.BinaryWriter.prototype.writePackedFixed32 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed fixed64 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedFixed64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1440,7 +1444,7 @@ jspb.BinaryWriter.prototype.writePackedFixed64 = function(field, value) {
  * Writes an array of numbers represented as strings to the buffer as a packed
  * fixed64 field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of strings to write.
+ * @param {?Array<string>} value The array of strings to write.
  */
 jspb.BinaryWriter.prototype.writePackedFixed64String = function(field, value) {
   if (value == null || !value.length) return;
@@ -1456,7 +1460,7 @@ jspb.BinaryWriter.prototype.writePackedFixed64String = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed sfixed32 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedSfixed32 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1471,7 +1475,7 @@ jspb.BinaryWriter.prototype.writePackedSfixed32 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed sfixed64 field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedSfixed64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1486,7 +1490,7 @@ jspb.BinaryWriter.prototype.writePackedSfixed64 = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed sfixed64 field.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of decimal strings to write.
+ * @param {?Array<string>} value The array of decimal strings to write.
  */
 jspb.BinaryWriter.prototype.writePackedSfixed64String = function(field, value) {
   if (value == null || !value.length) return;
@@ -1501,7 +1505,7 @@ jspb.BinaryWriter.prototype.writePackedSfixed64String = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed float field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedFloat = function(field, value) {
   if (value == null || !value.length) return;
@@ -1516,7 +1520,7 @@ jspb.BinaryWriter.prototype.writePackedFloat = function(field, value) {
 /**
  * Writes an array of numbers to the buffer as a packed double field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedDouble = function(field, value) {
   if (value == null || !value.length) return;
@@ -1531,7 +1535,7 @@ jspb.BinaryWriter.prototype.writePackedDouble = function(field, value) {
 /**
  * Writes an array of booleans to the buffer as a packed bool field.
  * @param {number} field The field number.
- * @param {?Array.<boolean>} value The array of ints to write.
+ * @param {?Array<boolean>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedBool = function(field, value) {
   if (value == null || !value.length) return;
@@ -1546,7 +1550,7 @@ jspb.BinaryWriter.prototype.writePackedBool = function(field, value) {
 /**
  * Writes an array of enums to the buffer as a packed enum field.
  * @param {number} field The field number.
- * @param {?Array.<number>} value The array of ints to write.
+ * @param {?Array<number>} value The array of ints to write.
  */
 jspb.BinaryWriter.prototype.writePackedEnum = function(field, value) {
   if (value == null || !value.length) return;
@@ -1562,7 +1566,7 @@ jspb.BinaryWriter.prototype.writePackedEnum = function(field, value) {
  * Writes a 64-bit hash string field (8 characters @ 8 bits of data each) to
  * the buffer.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of hashes to write.
+ * @param {?Array<string>} value The array of hashes to write.
  */
 jspb.BinaryWriter.prototype.writePackedFixedHash64 = function(field, value) {
   if (value == null || !value.length) return;
@@ -1578,7 +1582,7 @@ jspb.BinaryWriter.prototype.writePackedFixedHash64 = function(field, value) {
  * Writes a 64-bit hash string field (8 characters @ 8 bits of data each) to
  * the buffer.
  * @param {number} field The field number.
- * @param {?Array.<string>} value The array of hashes to write.
+ * @param {?Array<string>} value The array of hashes to write.
  */
 jspb.BinaryWriter.prototype.writePackedVarintHash64 = function(field, value) {
   if (value == null || !value.length) return;
diff --git a/js/binary/writer_test.js b/js/binary/writer_test.js
index 83fcdf91..8a9a1bb0 100644
--- a/js/binary/writer_test.js
+++ b/js/binary/writer_test.js
@@ -47,7 +47,7 @@ goog.require('jspb.BinaryWriter');
  * @param {function()} func This function should throw an error when run.
  */
 function assertFails(func) {
-  var e = assertThrows(func);
+  assertThrows(func);
 }
 
 
@@ -118,4 +118,16 @@ describe('binaryWriterTest', function() {
     var buffer = writer.getResultBuffer();
     assertEquals(expected, goog.crypt.byteArrayToHex(buffer));
   });
+
+
+  /**
+   * Tests websafe encodings for base64 strings.
+   */
+  it('testWebSafeOption', function() {
+    var writer = new jspb.BinaryWriter();
+    writer.writeBytes(1, new Uint8Array([127]));
+    assertEquals('CgF/', writer.getResultBase64String());
+    assertEquals('CgF/', writer.getResultBase64String(false));
+    assertEquals('CgF_', writer.getResultBase64String(true));
+  });
 });
diff --git a/js/commonjs/export_testdeps.js b/js/commonjs/export_testdeps.js
index 6f5cd083..96d3f347 100644
--- a/js/commonjs/export_testdeps.js
+++ b/js/commonjs/export_testdeps.js
@@ -12,6 +12,7 @@
 goog.provide('jspb.ExportTestDeps');
 
 goog.require('goog.crypt.base64');
+goog.require('goog.testing.PropertyReplacer');
 goog.require('jspb.arith.Int64');
 goog.require('jspb.arith.UInt64');
 goog.require('jspb.BinaryEncoder');
diff --git a/js/compatibility_tests/v3.0.0/binary/arith_test.js b/js/compatibility_tests/v3.0.0/binary/arith_test.js
new file mode 100644
index 00000000..89796bf7
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/arith_test.js
@@ -0,0 +1,355 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for Int64-manipulation functions.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author cfallin@google.com (Chris Fallin)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.arith.Int64');
+goog.require('jspb.arith.UInt64');
+
+
+describe('binaryArithTest', function() {
+  /**
+   * Tests comparison operations.
+   */
+  it('testCompare', function() {
+    var a = new jspb.arith.UInt64(1234, 5678);
+    var b = new jspb.arith.UInt64(1234, 5678);
+    assertEquals(a.cmp(b), 0);
+    assertEquals(b.cmp(a), 0);
+    b.lo -= 1;
+    assertEquals(a.cmp(b), 1);
+    assertEquals(b.cmp(a), -1);
+    b.lo += 2;
+    assertEquals(a.cmp(b), -1);
+    assertEquals(b.cmp(a), 1);
+    b.lo = a.lo;
+    b.hi = a.hi - 1;
+    assertEquals(a.cmp(b), 1);
+    assertEquals(b.cmp(a), -1);
+
+    assertEquals(a.zero(), false);
+    assertEquals(a.msb(), false);
+    assertEquals(a.lsb(), false);
+    a.hi = 0;
+    a.lo = 0;
+    assertEquals(a.zero(), true);
+    a.hi = 0x80000000;
+    assertEquals(a.zero(), false);
+    assertEquals(a.msb(), true);
+    a.lo = 0x00000001;
+    assertEquals(a.lsb(), true);
+  });
+
+
+  /**
+   * Tests shifts.
+   */
+  it('testShifts', function() {
+    var a = new jspb.arith.UInt64(1, 0);
+    assertEquals(a.lo, 1);
+    assertEquals(a.hi, 0);
+    var orig = a;
+    a = a.leftShift();
+    assertEquals(orig.lo, 1);  // original unmodified.
+    assertEquals(orig.hi, 0);
+    assertEquals(a.lo, 2);
+    assertEquals(a.hi, 0);
+    a = a.leftShift();
+    assertEquals(a.lo, 4);
+    assertEquals(a.hi, 0);
+    for (var i = 0; i < 29; i++) {
+      a = a.leftShift();
+    }
+    assertEquals(a.lo, 0x80000000);
+    assertEquals(a.hi, 0);
+    a = a.leftShift();
+    assertEquals(a.lo, 0);
+    assertEquals(a.hi, 1);
+    a = a.leftShift();
+    assertEquals(a.lo, 0);
+    assertEquals(a.hi, 2);
+    a = a.rightShift();
+    a = a.rightShift();
+    assertEquals(a.lo, 0x80000000);
+    assertEquals(a.hi, 0);
+    a = a.rightShift();
+    assertEquals(a.lo, 0x40000000);
+    assertEquals(a.hi, 0);
+  });
+
+
+  /**
+   * Tests additions.
+   */
+  it('testAdd', function() {
+    var a = new jspb.arith.UInt64(/* lo = */ 0x89abcdef,
+                                         /* hi = */ 0x01234567);
+    var b = new jspb.arith.UInt64(/* lo = */ 0xff52ab91,
+                                         /* hi = */ 0x92fa2123);
+    // Addition with carry.
+    var c = a.add(b);
+    assertEquals(a.lo, 0x89abcdef);  // originals unmodified.
+    assertEquals(a.hi, 0x01234567);
+    assertEquals(b.lo, 0xff52ab91);
+    assertEquals(b.hi, 0x92fa2123);
+    assertEquals(c.lo, 0x88fe7980);
+    assertEquals(c.hi, 0x941d668b);
+
+    // Simple addition without carry.
+    a.lo = 2;
+    a.hi = 0;
+    b.lo = 3;
+    b.hi = 0;
+    c = a.add(b);
+    assertEquals(c.lo, 5);
+    assertEquals(c.hi, 0);
+  });
+
+
+  /**
+   * Test subtractions.
+   */
+  it('testSub', function() {
+    var kLength = 10;
+    var hiValues = [0x1682ef32,
+                    0x583902f7,
+                    0xb62f5955,
+                    0x6ea99bbf,
+                    0x25a39c20,
+                    0x0700a08b,
+                    0x00f7304d,
+                    0x91a5b5af,
+                    0x89077fd2,
+                    0xe09e347c];
+    var loValues = [0xe1538b18,
+                    0xbeacd556,
+                    0x74100758,
+                    0x96e3cb26,
+                    0x56c37c3f,
+                    0xe00b3f7d,
+                    0x859f25d7,
+                    0xc2ee614a,
+                    0xe1d21cd7,
+                    0x30aae6a4];
+    for (var i = 0; i < kLength; i++) {
+      for (var j = 0; j < kLength; j++) {
+        var a = new jspb.arith.UInt64(loValues[i], hiValues[j]);
+        var b = new jspb.arith.UInt64(loValues[j], hiValues[i]);
+        var c = a.add(b).sub(b);
+        assertEquals(c.hi, a.hi);
+        assertEquals(c.lo, a.lo);
+      }
+    }
+  });
+
+
+  /**
+   * Tests 32-by-32 multiplication.
+   */
+  it('testMul32x32', function() {
+    var testData = [
+      // a        b          low(a*b)   high(a*b)
+      [0xc0abe2f8, 0x1607898a, 0x5de711b0, 0x109471b8],
+      [0x915eb3cb, 0x4fb66d0e, 0xbd0d441a, 0x2d43d0bc],
+      [0xfe4efe70, 0x80b48c37, 0xbcddea10, 0x7fdada0c],
+      [0xe222fd4a, 0xe43d524a, 0xd5e0eb64, 0xc99d549c],
+      [0xd171f469, 0xb94ebd01, 0x4be17969, 0x979bc4fa],
+      [0x829cc1df, 0xe2598b38, 0xf4157dc8, 0x737c12ad],
+      [0xf10c3767, 0x8382881e, 0x942b3612, 0x7bd428b8],
+      [0xb0f6dd24, 0x232597e1, 0x079c98a4, 0x184bbce7],
+      [0xfcdb05a7, 0x902f55bc, 0x636199a4, 0x8e69f412],
+      [0x0dd0bfa9, 0x916e27b1, 0x6e2542d9, 0x07d92e65]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = testData[i][0] >>> 0;
+      var b = testData[i][1] >>> 0;
+      var cLow = testData[i][2] >>> 0;
+      var cHigh = testData[i][3] >>> 0;
+      var c = jspb.arith.UInt64.mul32x32(a, b);
+      assertEquals(c.lo, cLow);
+      assertEquals(c.hi, cHigh);
+    }
+  });
+
+
+  /**
+   * Tests 64-by-32 multiplication.
+   */
+  it('testMul', function() {
+    // 64x32 bits produces 96 bits of product. The multiplication function under
+    // test truncates the top 32 bits, so we compare against a 64-bit expected
+    // product.
+    var testData = [
+      // low(a)   high(a)               low(a*b)   high(a*b)
+      [0xec10955b, 0x360eb168, 0x4b7f3f5b, 0xbfcb7c59, 0x9517da5f],
+      [0x42b000fc, 0x9d101642, 0x6fa1ab72, 0x2584c438, 0x6a9e6d2b],
+      [0xf42d4fb4, 0xae366403, 0xa65a1000, 0x92434000, 0x1ff978df],
+      [0x17e2f56b, 0x25487693, 0xf13f98c7, 0x73794e2d, 0xa96b0c6a],
+      [0x492f241f, 0x76c0eb67, 0x7377ac44, 0xd4336c3c, 0xfc4b1ebe],
+      [0xd6b92321, 0xe184fa48, 0xd6e76904, 0x93141584, 0xcbf44da1],
+      [0x4bf007ea, 0x968c0a9e, 0xf5e4026a, 0x4fdb1ae4, 0x61b9fb7d],
+      [0x10a83be7, 0x2d685ba6, 0xc9e5fb7f, 0x2ad43499, 0x3742473d],
+      [0x2f261829, 0x1aca681a, 0x3d3494e3, 0x8213205b, 0x283719f8],
+      [0xe4f2ce21, 0x2e74b7bd, 0xd801b38b, 0xbc17feeb, 0xc6c44e0f]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var prod = a.mul(testData[i][2]);
+      assertEquals(prod.lo, testData[i][3]);
+      assertEquals(prod.hi, testData[i][4]);
+    }
+  });
+
+
+  /**
+   * Tests 64-div-by-32 division.
+   */
+  it('testDiv', function() {
+    // Compute a/b, yielding quot = a/b and rem = a%b.
+    var testData = [
+      // --- divisors in (0, 2^32-1) to test full divisor range
+      // low(a)   high(a)    b          low(quot)  high(quot) rem
+      [0x712443f1, 0xe85cefcc, 0xc1a7050b, 0x332c79ad, 0x00000001, 0x92ffa882],
+      [0x11912915, 0xb2699eb5, 0x30467cbe, 0xb21b4be4, 0x00000003, 0x283465dd],
+      [0x0d917982, 0x201f2a6e, 0x3f35bf03, 0x8217c8e4, 0x00000000, 0x153402d6],
+      [0xa072c108, 0x74020c96, 0xc60568fd, 0x95f9613e, 0x00000000, 0x3f4676c2],
+      [0xd845d5d8, 0xcdd235c4, 0x20426475, 0x6154e78b, 0x00000006, 0x202fb751],
+      [0xa4dbf71f, 0x9e90465e, 0xf08e022f, 0xa8be947f, 0x00000000, 0xbe43b5ce],
+      [0x3dbe627f, 0xa791f4b9, 0x28a5bd89, 0x1f5dfe93, 0x00000004, 0x02bf9ed4],
+      [0x5c1c53ee, 0xccf5102e, 0x198576e7, 0x07e3ae31, 0x00000008, 0x02ea8fb7],
+      [0xfef1e581, 0x04714067, 0xca6540c1, 0x059e73ec, 0x00000000, 0x31658095],
+      [0x1e2dd90c, 0x13dd6667, 0x8b2184c3, 0x248d1a42, 0x00000000, 0x4ca6d0c6],
+      // --- divisors in (0, 2^16-1) to test larger quotient high-words
+      // low(a)   high(a)    b          low(quot)  high(quot) rem
+      [0x86722b47, 0x2cd57c9a, 0x00003123, 0x2ae41b7a, 0x0000e995, 0x00000f99],
+      [0x1dd7884c, 0xf5e839bc, 0x00009eeb, 0x5c886242, 0x00018c21, 0x000099b6],
+      [0x5c53d625, 0x899fc7e5, 0x000087d7, 0xd625007a, 0x0001035c, 0x000019af],
+      [0x6932d932, 0x9d0a5488, 0x000051fb, 0x9d976143, 0x0001ea63, 0x00004981],
+      [0x4d18bb85, 0x0c92fb31, 0x00001d9f, 0x03265ab4, 0x00006cac, 0x000001b9],
+      [0xbe756768, 0xdea67ccb, 0x00008a03, 0x58add442, 0x00019cff, 0x000056a2],
+      [0xe2466f9a, 0x2521f114, 0x0000c350, 0xa0c0860d, 0x000030ab, 0x0000a48a],
+      [0xf00ddad1, 0xe2f5446a, 0x00002cfc, 0x762697a6, 0x00050b96, 0x00000b69],
+      [0xa879152a, 0x0a70e0a5, 0x00007cdf, 0xb44151b3, 0x00001567, 0x0000363d],
+      [0x7179a74c, 0x46083fff, 0x0000253c, 0x4d39ba6e, 0x0001e17f, 0x00000f84]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var result = a.div(testData[i][2]);
+      var quotient = result[0];
+      var remainder = result[1];
+      assertEquals(quotient.lo, testData[i][3]);
+      assertEquals(quotient.hi, testData[i][4]);
+      assertEquals(remainder.lo, testData[i][5]);
+    }
+  });
+
+
+  /**
+   * Tests .toString() and .fromString().
+   */
+  it('testStrings', function() {
+    var testData = [
+        [0x5e84c935, 0xcae33d0e, '14619595947299359029'],
+        [0x62b3b8b8, 0x93480544, '10612738313170434232'],
+        [0x319bfb13, 0xc01c4172, '13843011313344445203'],
+        [0x5b8a65fb, 0xa5885b31, '11927883880638080507'],
+        [0x6bdb80f1, 0xb0d1b16b, '12741159895737008369'],
+        [0x4b82b442, 0x2e0d8c97, '3318463081876730946'],
+        [0x780d5208, 0x7d76752c, '9040542135845999112'],
+        [0x2e46800f, 0x0993778d, '690026616168284175'],
+        [0xf00a7e32, 0xcd8e3931, '14811839111111540274'],
+        [0x1baeccd6, 0x923048c4, '10533999535534820566'],
+        [0x03669d29, 0xbff3ab72, '13831587386756603177'],
+        [0x2526073e, 0x01affc81, '121593346566522686'],
+        [0xc24244e0, 0xd7f40d0e, '15561076969511732448'],
+        [0xc56a341e, 0xa68b66a7, '12000798502816461854'],
+        [0x8738d64d, 0xbfe78604, '13828168534871037517'],
+        [0x5baff03b, 0xd7572aea, '15516918227177304123'],
+        [0x4a843d8a, 0x864e132b, '9677693725920476554'],
+        [0x25b4e94d, 0x22b54dc6, '2500990681505655117'],
+        [0x6bbe664b, 0x55a5cc0e, '6171563226690381387'],
+        [0xee916c81, 0xb00aabb3, '12685140089732426881']
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var roundtrip = jspb.arith.UInt64.fromString(a.toString());
+      assertEquals(roundtrip.lo, a.lo);
+      assertEquals(roundtrip.hi, a.hi);
+      assertEquals(a.toString(), testData[i][2]);
+    }
+  });
+
+
+  /**
+   * Tests signed Int64s. These are built on UInt64s, so we only need to test
+   * the explicit overrides: .toString() and .fromString().
+   */
+  it('testSignedInt64', function() {
+    var testStrings = [
+        '-7847499644178593666',
+        '3771946501229139523',
+        '2872856549054995060',
+        '-5780049594274350904',
+        '3383785956695105201',
+        '2973055184857072610',
+        '-3879428459215627206',
+        '4589812431064156631',
+        '8484075557333689940',
+        '1075325817098092407',
+        '-4346697501012292314',
+        '2488620459718316637',
+        '6112655187423520672',
+        '-3655278273928612104',
+        '3439154019435803196',
+        '1004112478843763757',
+        '-6587790776614368413',
+        '664320065099714586',
+        '4760412909973292912',
+        '-7911903989602274672'
+    ];
+
+    for (var i = 0; i < testStrings.length; i++) {
+      var roundtrip =
+          jspb.arith.Int64.fromString(testStrings[i]).toString();
+      assertEquals(roundtrip, testStrings[i]);
+    }
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/binary/decoder_test.js b/js/compatibility_tests/v3.0.0/binary/decoder_test.js
new file mode 100644
index 00000000..fce2fe18
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/decoder_test.js
@@ -0,0 +1,317 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer decoder.
+ *
+ * There are two particular magic numbers that need to be pointed out -
+ * 2^64-1025 is the largest number representable as both a double and an
+ * unsigned 64-bit integer, and 2^63-513 is the largest number representable as
+ * both a double and a signed 64-bit integer.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryDecoder');
+goog.require('jspb.BinaryEncoder');
+
+
+/**
+ * Tests encoding and decoding of unsigned types.
+ * @param {Function} readValue
+ * @param {Function} writeValue
+ * @param {number} epsilon
+ * @param {number} upperLimit
+ * @param {Function} filter
+ * @suppress {missingProperties|visibility}
+ */
+function doTestUnsignedValue(readValue,
+    writeValue, epsilon, upperLimit, filter) {
+  var encoder = new jspb.BinaryEncoder();
+
+  // Encode zero and limits.
+  writeValue.call(encoder, filter(0));
+  writeValue.call(encoder, filter(epsilon));
+  writeValue.call(encoder, filter(upperLimit));
+
+  // Encode positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    writeValue.call(encoder, filter(cursor));
+  }
+
+  var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+  // Check zero and limits.
+  assertEquals(filter(0), readValue.call(decoder));
+  assertEquals(filter(epsilon), readValue.call(decoder));
+  assertEquals(filter(upperLimit), readValue.call(decoder));
+
+  // Check positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    if (filter(cursor) != readValue.call(decoder)) throw 'fail!';
+  }
+
+  // Encoding values outside the valid range should assert.
+  assertThrows(function() {writeValue.call(encoder, -1);});
+  assertThrows(function() {writeValue.call(encoder, upperLimit * 1.1);});
+}
+
+
+/**
+ * Tests encoding and decoding of signed types.
+ * @param {Function} readValue
+ * @param {Function} writeValue
+ * @param {number} epsilon
+ * @param {number} lowerLimit
+ * @param {number} upperLimit
+ * @param {Function} filter
+ * @suppress {missingProperties}
+ */
+function doTestSignedValue(readValue,
+    writeValue, epsilon, lowerLimit, upperLimit, filter) {
+  var encoder = new jspb.BinaryEncoder();
+
+  // Encode zero and limits.
+  writeValue.call(encoder, filter(lowerLimit));
+  writeValue.call(encoder, filter(-epsilon));
+  writeValue.call(encoder, filter(0));
+  writeValue.call(encoder, filter(epsilon));
+  writeValue.call(encoder, filter(upperLimit));
+
+  var inputValues = [];
+
+  // Encode negative values.
+  for (var cursor = lowerLimit; cursor < -epsilon; cursor /= 1.1) {
+    var val = filter(cursor);
+    writeValue.call(encoder, val);
+    inputValues.push(val);
+  }
+
+  // Encode positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    var val = filter(cursor);
+    writeValue.call(encoder, val);
+    inputValues.push(val);
+  }
+
+  var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+  // Check zero and limits.
+  assertEquals(filter(lowerLimit), readValue.call(decoder));
+  assertEquals(filter(-epsilon), readValue.call(decoder));
+  assertEquals(filter(0), readValue.call(decoder));
+  assertEquals(filter(epsilon), readValue.call(decoder));
+  assertEquals(filter(upperLimit), readValue.call(decoder));
+
+  // Verify decoded values.
+  for (var i = 0; i < inputValues.length; i++) {
+    assertEquals(inputValues[i], readValue.call(decoder));
+  }
+
+  // Encoding values outside the valid range should assert.
+  assertThrows(function() {writeValue.call(encoder, lowerLimit * 1.1);});
+  assertThrows(function() {writeValue.call(encoder, upperLimit * 1.1);});
+}
+
+describe('binaryDecoderTest', function() {
+  /**
+   * Tests the decoder instance cache.
+   */
+  it('testInstanceCache', /** @suppress {visibility} */ function() {
+    // Empty the instance caches.
+    jspb.BinaryDecoder.instanceCache_ = [];
+
+    // Allocating and then freeing a decoder should put it in the instance
+    // cache.
+    jspb.BinaryDecoder.alloc().free();
+
+    assertEquals(1, jspb.BinaryDecoder.instanceCache_.length);
+
+    // Allocating and then freeing three decoders should leave us with three in
+    // the cache.
+
+    var decoder1 = jspb.BinaryDecoder.alloc();
+    var decoder2 = jspb.BinaryDecoder.alloc();
+    var decoder3 = jspb.BinaryDecoder.alloc();
+    decoder1.free();
+    decoder2.free();
+    decoder3.free();
+
+    assertEquals(3, jspb.BinaryDecoder.instanceCache_.length);
+  });
+
+
+  /**
+   * Tests reading 64-bit integers as hash strings.
+   */
+  it('testHashStrings', function() {
+    var encoder = new jspb.BinaryEncoder();
+
+    var hashA = String.fromCharCode(0x00, 0x00, 0x00, 0x00,
+                                    0x00, 0x00, 0x00, 0x00);
+    var hashB = String.fromCharCode(0x12, 0x34, 0x00, 0x00,
+                                    0x00, 0x00, 0x00, 0x00);
+    var hashC = String.fromCharCode(0x12, 0x34, 0x56, 0x78,
+                                    0x87, 0x65, 0x43, 0x21);
+    var hashD = String.fromCharCode(0xFF, 0xFF, 0xFF, 0xFF,
+                                    0xFF, 0xFF, 0xFF, 0xFF);
+
+    encoder.writeVarintHash64(hashA);
+    encoder.writeVarintHash64(hashB);
+    encoder.writeVarintHash64(hashC);
+    encoder.writeVarintHash64(hashD);
+
+    encoder.writeFixedHash64(hashA);
+    encoder.writeFixedHash64(hashB);
+    encoder.writeFixedHash64(hashC);
+    encoder.writeFixedHash64(hashD);
+
+    var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+    assertEquals(hashA, decoder.readVarintHash64());
+    assertEquals(hashB, decoder.readVarintHash64());
+    assertEquals(hashC, decoder.readVarintHash64());
+    assertEquals(hashD, decoder.readVarintHash64());
+
+    assertEquals(hashA, decoder.readFixedHash64());
+    assertEquals(hashB, decoder.readFixedHash64());
+    assertEquals(hashC, decoder.readFixedHash64());
+    assertEquals(hashD, decoder.readFixedHash64());
+  });
+
+
+  /**
+   * Verifies that misuse of the decoder class triggers assertions.
+   * @suppress {checkTypes|visibility}
+   */
+  it('testDecodeErrors', function() {
+    // Reading a value past the end of the stream should trigger an assertion.
+    var decoder = jspb.BinaryDecoder.alloc([0, 1, 2]);
+    assertThrows(function() {decoder.readUint64()});
+
+    // Overlong varints should trigger assertions.
+    decoder.setBlock([255, 255, 255, 255, 255, 255,
+                      255, 255, 255, 255, 255, 0]);
+    assertThrows(function() {decoder.readUnsignedVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readSignedVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readZigzagVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readUnsignedVarint32()});
+  });
+
+
+  /**
+   * Tests encoding and decoding of unsigned integers.
+   */
+  it('testUnsignedIntegers', function() {
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint8,
+        jspb.BinaryEncoder.prototype.writeUint8,
+        1, 0xFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint16,
+        jspb.BinaryEncoder.prototype.writeUint16,
+        1, 0xFFFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint32,
+        jspb.BinaryEncoder.prototype.writeUint32,
+        1, 0xFFFFFFFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint64,
+        jspb.BinaryEncoder.prototype.writeUint64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+  });
+
+
+  /**
+   * Tests encoding and decoding of signed integers.
+   */
+  it('testSignedIntegers', function() {
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt8,
+        jspb.BinaryEncoder.prototype.writeInt8,
+        1, -0x80, 0x7F, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt16,
+        jspb.BinaryEncoder.prototype.writeInt16,
+        1, -0x8000, 0x7FFF, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt32,
+        jspb.BinaryEncoder.prototype.writeInt32,
+        1, -0x80000000, 0x7FFFFFFF, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt64,
+        jspb.BinaryEncoder.prototype.writeInt64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests encoding and decoding of floats.
+   */
+  it('testFloats', function() {
+    /**
+     * @param {number} x
+     * @return {number}
+     */
+    function truncate(x) {
+      var temp = new Float32Array(1);
+      temp[0] = x;
+      return temp[0];
+    }
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readFloat,
+        jspb.BinaryEncoder.prototype.writeFloat,
+        jspb.BinaryConstants.FLOAT32_EPS,
+        -jspb.BinaryConstants.FLOAT32_MAX,
+        jspb.BinaryConstants.FLOAT32_MAX,
+        truncate);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readDouble,
+        jspb.BinaryEncoder.prototype.writeDouble,
+        jspb.BinaryConstants.FLOAT64_EPS * 10,
+        -jspb.BinaryConstants.FLOAT64_MAX,
+        jspb.BinaryConstants.FLOAT64_MAX,
+        function(x) { return x; });
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/binary/proto_test.js b/js/compatibility_tests/v3.0.0/binary/proto_test.js
new file mode 100644
index 00000000..14d0f42e
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/proto_test.js
@@ -0,0 +1,628 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Test suite is written using Jasmine -- see http://jasmine.github.io/
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+goog.require('jspb.Message');
+
+// CommonJS-LoadFromFile: ../testbinary_pb proto.jspb.test
+goog.require('proto.jspb.test.ExtendsWithMessage');
+goog.require('proto.jspb.test.ForeignEnum');
+goog.require('proto.jspb.test.ForeignMessage');
+goog.require('proto.jspb.test.TestAllTypes');
+goog.require('proto.jspb.test.TestExtendable');
+goog.require('proto.jspb.test.extendOptionalBool');
+goog.require('proto.jspb.test.extendOptionalBytes');
+goog.require('proto.jspb.test.extendOptionalDouble');
+goog.require('proto.jspb.test.extendOptionalFixed32');
+goog.require('proto.jspb.test.extendOptionalFixed64');
+goog.require('proto.jspb.test.extendOptionalFloat');
+goog.require('proto.jspb.test.extendOptionalForeignEnum');
+goog.require('proto.jspb.test.extendOptionalInt32');
+goog.require('proto.jspb.test.extendOptionalInt64');
+goog.require('proto.jspb.test.extendOptionalSfixed32');
+goog.require('proto.jspb.test.extendOptionalSfixed64');
+goog.require('proto.jspb.test.extendOptionalSint32');
+goog.require('proto.jspb.test.extendOptionalSint64');
+goog.require('proto.jspb.test.extendOptionalString');
+goog.require('proto.jspb.test.extendOptionalUint32');
+goog.require('proto.jspb.test.extendOptionalUint64');
+goog.require('proto.jspb.test.extendPackedRepeatedBoolList');
+goog.require('proto.jspb.test.extendPackedRepeatedDoubleList');
+goog.require('proto.jspb.test.extendPackedRepeatedFixed32List');
+goog.require('proto.jspb.test.extendPackedRepeatedFixed64List');
+goog.require('proto.jspb.test.extendPackedRepeatedFloatList');
+goog.require('proto.jspb.test.extendPackedRepeatedForeignEnumList');
+goog.require('proto.jspb.test.extendPackedRepeatedInt32List');
+goog.require('proto.jspb.test.extendPackedRepeatedInt64List');
+goog.require('proto.jspb.test.extendPackedRepeatedSfixed32List');
+goog.require('proto.jspb.test.extendPackedRepeatedSfixed64List');
+goog.require('proto.jspb.test.extendPackedRepeatedSint32List');
+goog.require('proto.jspb.test.extendPackedRepeatedSint64List');
+goog.require('proto.jspb.test.extendPackedRepeatedUint32List');
+goog.require('proto.jspb.test.extendPackedRepeatedUint64List');
+goog.require('proto.jspb.test.extendRepeatedBoolList');
+goog.require('proto.jspb.test.extendRepeatedBytesList');
+goog.require('proto.jspb.test.extendRepeatedDoubleList');
+goog.require('proto.jspb.test.extendRepeatedFixed32List');
+goog.require('proto.jspb.test.extendRepeatedFixed64List');
+goog.require('proto.jspb.test.extendRepeatedFloatList');
+goog.require('proto.jspb.test.extendRepeatedForeignEnumList');
+goog.require('proto.jspb.test.extendRepeatedInt32List');
+goog.require('proto.jspb.test.extendRepeatedInt64List');
+goog.require('proto.jspb.test.extendRepeatedSfixed32List');
+goog.require('proto.jspb.test.extendRepeatedSfixed64List');
+goog.require('proto.jspb.test.extendRepeatedSint32List');
+goog.require('proto.jspb.test.extendRepeatedSint64List');
+goog.require('proto.jspb.test.extendRepeatedStringList');
+goog.require('proto.jspb.test.extendRepeatedUint32List');
+goog.require('proto.jspb.test.extendRepeatedUint64List');
+
+
+var suite = {};
+
+var BYTES = new Uint8Array([1, 2, 8, 9]);
+
+var BYTES_B64 = goog.crypt.base64.encodeByteArray(BYTES);
+
+
+/**
+ * Helper: fill all fields on a TestAllTypes message.
+ * @param {proto.jspb.test.TestAllTypes} msg
+ */
+function fillAllFields(msg) {
+  msg.setOptionalInt32(-42);
+  // can be exactly represented by JS number (64-bit double, i.e., 52-bit
+  // mantissa).
+  msg.setOptionalInt64(-0x7fffffff00000000);
+  msg.setOptionalUint32(0x80000000);
+  msg.setOptionalUint64(0xf000000000000000);
+  msg.setOptionalSint32(-100);
+  msg.setOptionalSint64(-0x8000000000000000);
+  msg.setOptionalFixed32(1234);
+  msg.setOptionalFixed64(0x1234567800000000);
+  msg.setOptionalSfixed32(-1234);
+  msg.setOptionalSfixed64(-0x1234567800000000);
+  msg.setOptionalFloat(1.5);
+  msg.setOptionalDouble(-1.5);
+  msg.setOptionalBool(true);
+  msg.setOptionalString('hello world');
+  msg.setOptionalBytes(BYTES);
+  msg.setOptionalGroup(new proto.jspb.test.TestAllTypes.OptionalGroup());
+  msg.getOptionalGroup().setA(100);
+  var submsg = new proto.jspb.test.ForeignMessage();
+  submsg.setC(16);
+  msg.setOptionalForeignMessage(submsg);
+  msg.setOptionalForeignEnum(proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+  msg.setOneofString('oneof');
+
+
+  msg.setRepeatedInt32List([-42]);
+  msg.setRepeatedInt64List([-0x7fffffff00000000]);
+  msg.setRepeatedUint32List([0x80000000]);
+  msg.setRepeatedUint64List([0xf000000000000000]);
+  msg.setRepeatedSint32List([-100]);
+  msg.setRepeatedSint64List([-0x8000000000000000]);
+  msg.setRepeatedFixed32List([1234]);
+  msg.setRepeatedFixed64List([0x1234567800000000]);
+  msg.setRepeatedSfixed32List([-1234]);
+  msg.setRepeatedSfixed64List([-0x1234567800000000]);
+  msg.setRepeatedFloatList([1.5]);
+  msg.setRepeatedDoubleList([-1.5]);
+  msg.setRepeatedBoolList([true]);
+  msg.setRepeatedStringList(['hello world']);
+  msg.setRepeatedBytesList([BYTES, BYTES]);
+  msg.setRepeatedGroupList([new proto.jspb.test.TestAllTypes.RepeatedGroup()]);
+  msg.getRepeatedGroupList()[0].setA(100);
+  submsg = new proto.jspb.test.ForeignMessage();
+  submsg.setC(1000);
+  msg.setRepeatedForeignMessageList([submsg]);
+  msg.setRepeatedForeignEnumList([proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  msg.setPackedRepeatedInt32List([-42]);
+  msg.setPackedRepeatedInt64List([-0x7fffffff00000000]);
+  msg.setPackedRepeatedUint32List([0x80000000]);
+  msg.setPackedRepeatedUint64List([0xf000000000000000]);
+  msg.setPackedRepeatedSint32List([-100]);
+  msg.setPackedRepeatedSint64List([-0x8000000000000000]);
+  msg.setPackedRepeatedFixed32List([1234]);
+  msg.setPackedRepeatedFixed64List([0x1234567800000000]);
+  msg.setPackedRepeatedSfixed32List([-1234]);
+  msg.setPackedRepeatedSfixed64List([-0x1234567800000000]);
+  msg.setPackedRepeatedFloatList([1.5]);
+  msg.setPackedRepeatedDoubleList([-1.5]);
+  msg.setPackedRepeatedBoolList([true]);
+
+}
+
+
+/**
+ * Helper: compare a bytes field to an expected value
+ * @param {Uint8Array|string} arr
+ * @param {Uint8Array} expected
+ * @return {boolean}
+ */
+function bytesCompare(arr, expected) {
+  if (goog.isString(arr)) {
+    arr = goog.crypt.base64.decodeStringToUint8Array(arr);
+  }
+  if (arr.length != expected.length) {
+    return false;
+  }
+  for (var i = 0; i < arr.length; i++) {
+    if (arr[i] != expected[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+
+/**
+ * Helper: verify contents of given TestAllTypes message as set by
+ * fillAllFields().
+ * @param {proto.jspb.test.TestAllTypes} original
+ * @param {proto.jspb.test.TestAllTypes} copy
+ */
+function checkAllFields(original, copy) {
+  assertTrue(jspb.Message.equals(original, copy));
+
+  assertEquals(copy.getOptionalInt32(), -42);
+  assertEquals(copy.getOptionalInt64(), -0x7fffffff00000000);
+  assertEquals(copy.getOptionalUint32(), 0x80000000);
+  assertEquals(copy.getOptionalUint64(), 0xf000000000000000);
+  assertEquals(copy.getOptionalSint32(), -100);
+  assertEquals(copy.getOptionalSint64(), -0x8000000000000000);
+  assertEquals(copy.getOptionalFixed32(), 1234);
+  assertEquals(copy.getOptionalFixed64(), 0x1234567800000000);
+  assertEquals(copy.getOptionalSfixed32(), -1234);
+  assertEquals(copy.getOptionalSfixed64(), -0x1234567800000000);
+  assertEquals(copy.getOptionalFloat(), 1.5);
+  assertEquals(copy.getOptionalDouble(), -1.5);
+  assertEquals(copy.getOptionalBool(), true);
+  assertEquals(copy.getOptionalString(), 'hello world');
+  assertEquals(true, bytesCompare(copy.getOptionalBytes(), BYTES));
+  assertEquals(true, bytesCompare(copy.getOptionalBytes_asU8(), BYTES));
+  assertEquals(
+      copy.getOptionalBytes_asB64(), goog.crypt.base64.encodeByteArray(BYTES));
+
+  assertEquals(copy.getOptionalGroup().getA(), 100);
+  assertEquals(copy.getOptionalForeignMessage().getC(), 16);
+  assertEquals(copy.getOptionalForeignEnum(),
+      proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+
+
+  assertEquals(copy.getOneofString(), 'oneof');
+  assertEquals(copy.getOneofFieldCase(),
+      proto.jspb.test.TestAllTypes.OneofFieldCase.ONEOF_STRING);
+
+  assertElementsEquals(copy.getRepeatedInt32List(), [-42]);
+  assertElementsEquals(copy.getRepeatedInt64List(), [-0x7fffffff00000000]);
+  assertElementsEquals(copy.getRepeatedUint32List(), [0x80000000]);
+  assertElementsEquals(copy.getRepeatedUint64List(), [0xf000000000000000]);
+  assertElementsEquals(copy.getRepeatedSint32List(), [-100]);
+  assertElementsEquals(copy.getRepeatedSint64List(), [-0x8000000000000000]);
+  assertElementsEquals(copy.getRepeatedFixed32List(), [1234]);
+  assertElementsEquals(copy.getRepeatedFixed64List(), [0x1234567800000000]);
+  assertElementsEquals(copy.getRepeatedSfixed32List(), [-1234]);
+  assertElementsEquals(copy.getRepeatedSfixed64List(), [-0x1234567800000000]);
+  assertElementsEquals(copy.getRepeatedFloatList(), [1.5]);
+  assertElementsEquals(copy.getRepeatedDoubleList(), [-1.5]);
+  assertElementsEquals(copy.getRepeatedBoolList(), [true]);
+  assertElementsEquals(copy.getRepeatedStringList(), ['hello world']);
+  assertEquals(copy.getRepeatedBytesList().length, 2);
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList_asU8()[0], BYTES));
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList()[0], BYTES));
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList_asU8()[1], BYTES));
+  assertEquals(copy.getRepeatedBytesList_asB64()[0], BYTES_B64);
+  assertEquals(copy.getRepeatedBytesList_asB64()[1], BYTES_B64);
+  assertEquals(copy.getRepeatedGroupList().length, 1);
+  assertEquals(copy.getRepeatedGroupList()[0].getA(), 100);
+  assertEquals(copy.getRepeatedForeignMessageList().length, 1);
+  assertEquals(copy.getRepeatedForeignMessageList()[0].getC(), 1000);
+  assertElementsEquals(copy.getRepeatedForeignEnumList(),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  assertElementsEquals(copy.getPackedRepeatedInt32List(), [-42]);
+  assertElementsEquals(copy.getPackedRepeatedInt64List(),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(copy.getPackedRepeatedUint32List(), [0x80000000]);
+  assertElementsEquals(copy.getPackedRepeatedUint64List(),
+      [0xf000000000000000]);
+  assertElementsEquals(copy.getPackedRepeatedSint32List(), [-100]);
+  assertElementsEquals(copy.getPackedRepeatedSint64List(),
+      [-0x8000000000000000]);
+  assertElementsEquals(copy.getPackedRepeatedFixed32List(), [1234]);
+  assertElementsEquals(copy.getPackedRepeatedFixed64List(),
+      [0x1234567800000000]);
+  assertElementsEquals(copy.getPackedRepeatedSfixed32List(), [-1234]);
+  assertElementsEquals(copy.getPackedRepeatedSfixed64List(),
+      [-0x1234567800000000]);
+  assertElementsEquals(copy.getPackedRepeatedFloatList(), [1.5]);
+  assertElementsEquals(copy.getPackedRepeatedDoubleList(), [-1.5]);
+
+}
+
+
+/**
+ * Helper: verify that all expected extensions are present.
+ * @param {!proto.jspb.test.TestExtendable} msg
+ */
+function checkExtensions(msg) {
+  assertEquals(-42,
+      msg.getExtension(proto.jspb.test.extendOptionalInt32));
+  assertEquals(-0x7fffffff00000000,
+      msg.getExtension(proto.jspb.test.extendOptionalInt64));
+  assertEquals(0x80000000,
+      msg.getExtension(proto.jspb.test.extendOptionalUint32));
+  assertEquals(0xf000000000000000,
+      msg.getExtension(proto.jspb.test.extendOptionalUint64));
+  assertEquals(-100,
+      msg.getExtension(proto.jspb.test.extendOptionalSint32));
+  assertEquals(-0x8000000000000000,
+      msg.getExtension(proto.jspb.test.extendOptionalSint64));
+  assertEquals(1234,
+      msg.getExtension(proto.jspb.test.extendOptionalFixed32));
+  assertEquals(0x1234567800000000,
+      msg.getExtension(proto.jspb.test.extendOptionalFixed64));
+  assertEquals(-1234,
+      msg.getExtension(proto.jspb.test.extendOptionalSfixed32));
+  assertEquals(-0x1234567800000000,
+      msg.getExtension(proto.jspb.test.extendOptionalSfixed64));
+  assertEquals(1.5,
+      msg.getExtension(proto.jspb.test.extendOptionalFloat));
+  assertEquals(-1.5,
+      msg.getExtension(proto.jspb.test.extendOptionalDouble));
+  assertEquals(true,
+      msg.getExtension(proto.jspb.test.extendOptionalBool));
+  assertEquals('hello world',
+      msg.getExtension(proto.jspb.test.extendOptionalString));
+  assertEquals(
+      true, bytesCompare(
+                msg.getExtension(proto.jspb.test.extendOptionalBytes), BYTES));
+  assertEquals(16,
+      msg.getExtension(
+          proto.jspb.test.ExtendsWithMessage.optionalExtension).getFoo());
+
+
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedInt32List),
+      [-42]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedInt64List),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedUint32List),
+      [0x80000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedUint64List),
+      [0xf000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSint32List),
+      [-100]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSint64List),
+      [-0x8000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFixed32List),
+      [1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFixed64List),
+      [0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSfixed32List),
+      [-1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSfixed64List),
+      [-0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFloatList),
+      [1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedDoubleList),
+      [-1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedBoolList),
+      [true]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedStringList),
+      ['hello world']);
+  assertEquals(
+      true,
+      bytesCompare(
+          msg.getExtension(proto.jspb.test.extendRepeatedBytesList)[0], BYTES));
+  assertEquals(1000,
+      msg.getExtension(
+          proto.jspb.test.ExtendsWithMessage.repeatedExtensionList)[0]
+      .getFoo());
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedForeignEnumList),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedInt32List),
+      [-42]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedInt64List),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedUint32List),
+      [0x80000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedUint64List),
+      [0xf000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSint32List),
+      [-100]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSint64List),
+      [-0x8000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFixed32List),
+      [1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFixed64List),
+      [0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSfixed32List),
+      [-1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSfixed64List),
+      [-0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFloatList),
+      [1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedDoubleList),
+      [-1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedBoolList),
+      [true]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedForeignEnumList),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+}
+
+
+describe('protoBinaryTest', function() {
+  /**
+   * Tests a basic serialization-deserializaton round-trip with all supported
+   * field types (on the TestAllTypes message type).
+   */
+  it('testRoundTrip', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    fillAllFields(msg);
+    var encoded = msg.serializeBinary();
+    var decoded = proto.jspb.test.TestAllTypes.deserializeBinary(encoded);
+    checkAllFields(msg, decoded);
+  });
+
+  /**
+   * Test that base64 string and Uint8Array are interchangeable in bytes fields.
+   */
+  it('testBytesFieldsGettersInterop', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    // Set from a base64 string and check all the getters work.
+    msg.setOptionalBytes(BYTES_B64);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    // Test binary serialize round trip doesn't break it.
+    msg = proto.jspb.test.TestAllTypes.deserializeBinary(msg.serializeBinary());
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg = new proto.jspb.test.TestAllTypes();
+    // Set from a Uint8Array and check all the getters work.
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+  });
+
+  /**
+   * Test that bytes setters will receive result of any of the getters.
+   */
+  it('testBytesFieldsSettersInterop', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg.setOptionalBytes(msg.getOptionalBytes());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+    msg.setOptionalBytes(msg.getOptionalBytes_asB64());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+    msg.setOptionalBytes(msg.getOptionalBytes_asU8());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+  });
+
+  /**
+   * Test that bytes setters will receive result of any of the getters.
+   */
+  it('testRepeatedBytesGetters', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+
+    function assertGetters() {
+      assertTrue(goog.isString(msg.getRepeatedBytesList_asB64()[0]));
+      assertTrue(goog.isString(msg.getRepeatedBytesList_asB64()[1]));
+      assertTrue(msg.getRepeatedBytesList_asU8()[0] instanceof Uint8Array);
+      assertTrue(msg.getRepeatedBytesList_asU8()[1] instanceof Uint8Array);
+
+      assertTrue(bytesCompare(msg.getRepeatedBytesList()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList()[1], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asB64()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asB64()[1], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asU8()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asU8()[1], BYTES));
+    }
+
+    msg.setRepeatedBytesList([BYTES, BYTES]);
+    assertGetters();
+
+    msg.setRepeatedBytesList([BYTES_B64, BYTES_B64]);
+    assertGetters();
+
+    msg.setRepeatedBytesList(null);
+    assertEquals(0, msg.getRepeatedBytesList().length);
+    assertEquals(0, msg.getRepeatedBytesList_asB64().length);
+    assertEquals(0, msg.getRepeatedBytesList_asU8().length);
+  });
+
+  /**
+   * Helper: fill all extension values.
+   * @param {proto.jspb.test.TestExtendable} msg
+   */
+  function fillExtensions(msg) {
+    msg.setExtension(
+        proto.jspb.test.extendOptionalInt32, -42);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalInt64, -0x7fffffff00000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalUint32, 0x80000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalUint64, 0xf000000000000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSint32, -100);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSint64, -0x8000000000000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFixed32, 1234);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFixed64, 0x1234567800000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSfixed32, -1234);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSfixed64, -0x1234567800000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFloat, 1.5);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalDouble, -1.5);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalBool, true);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalString, 'hello world');
+    msg.setExtension(proto.jspb.test.extendOptionalBytes, BYTES);
+    var submsg = new proto.jspb.test.ExtendsWithMessage();
+    submsg.setFoo(16);
+    msg.setExtension(
+        proto.jspb.test.ExtendsWithMessage.optionalExtension, submsg);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalForeignEnum,
+        proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+
+
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedInt32List, [-42]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedInt64List, [-0x7fffffff00000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedUint32List, [0x80000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedUint64List, [0xf000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSint32List, [-100]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSint64List, [-0x8000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFixed32List, [1234]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFixed64List, [0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSfixed32List, [-1234]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSfixed64List, [-0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFloatList, [1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedDoubleList, [-1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedBoolList, [true]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedStringList, ['hello world']);
+    msg.setExtension(proto.jspb.test.extendRepeatedBytesList, [BYTES]);
+    submsg = new proto.jspb.test.ExtendsWithMessage();
+    submsg.setFoo(1000);
+    msg.setExtension(
+        proto.jspb.test.ExtendsWithMessage.repeatedExtensionList, [submsg]);
+    msg.setExtension(proto.jspb.test.extendRepeatedForeignEnumList,
+        [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedInt32List, [-42]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedInt64List, [-0x7fffffff00000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedUint32List, [0x80000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedUint64List, [0xf000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSint32List, [-100]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSint64List, [-0x8000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFixed32List, [1234]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFixed64List, [0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSfixed32List, [-1234]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSfixed64List,
+        [-0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFloatList, [1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedDoubleList, [-1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedBoolList, [true]);
+    msg.setExtension(proto.jspb.test.extendPackedRepeatedForeignEnumList,
+        [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  }
+
+
+  /**
+   * Tests extension serialization and deserialization.
+   */
+  it('testExtensions', function() {
+    var msg = new proto.jspb.test.TestExtendable();
+    fillExtensions(msg);
+    var encoded = msg.serializeBinary();
+    var decoded = proto.jspb.test.TestExtendable.deserializeBinary(encoded);
+    checkExtensions(decoded);
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/binary/reader_test.js b/js/compatibility_tests/v3.0.0/binary/reader_test.js
new file mode 100644
index 00000000..95711385
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/reader_test.js
@@ -0,0 +1,922 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer reader.
+ *
+ * There are two particular magic numbers that need to be pointed out -
+ * 2^64-1025 is the largest number representable as both a double and an
+ * unsigned 64-bit integer, and 2^63-513 is the largest number representable as
+ * both a double and a signed 64-bit integer.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryDecoder');
+goog.require('jspb.BinaryReader');
+goog.require('jspb.BinaryWriter');
+
+
+
+describe('binaryReaderTest', function() {
+  /**
+   * Tests the reader instance cache.
+   */
+  it('testInstanceCaches', /** @suppress {visibility} */ function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    writer.writeMessage(1, dummyMessage, goog.nullFunction);
+    writer.writeMessage(2, dummyMessage, goog.nullFunction);
+
+    var buffer = writer.getResultBuffer();
+
+    // Empty the instance caches.
+    jspb.BinaryReader.instanceCache_ = [];
+
+    // Allocating and then freeing three decoders should leave us with three in
+    // the cache.
+
+    var decoder1 = jspb.BinaryDecoder.alloc();
+    var decoder2 = jspb.BinaryDecoder.alloc();
+    var decoder3 = jspb.BinaryDecoder.alloc();
+    decoder1.free();
+    decoder2.free();
+    decoder3.free();
+
+    assertEquals(3, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Allocating and then freeing a reader should remove one decoder from its
+    // cache, but it should stay stuck to the reader afterwards since we can't
+    // have a reader without a decoder.
+    jspb.BinaryReader.alloc().free();
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(1, jspb.BinaryReader.instanceCache_.length);
+
+    // Allocating a reader should remove a reader from the cache.
+    var reader = jspb.BinaryReader.alloc(buffer);
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Processing the message reuses the current reader.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+    });
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+    });
+
+    assertEquals(false, reader.nextField());
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Freeing the reader should put it back into the cache.
+    reader.free();
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(1, jspb.BinaryReader.instanceCache_.length);
+  });
+
+
+  /**
+   * @param {number} x
+   * @return {number}
+   */
+  function truncate(x) {
+    var temp = new Float32Array(1);
+    temp[0] = x;
+    return temp[0];
+  }
+
+
+  /**
+   * Verifies that misuse of the reader class triggers assertions.
+   */
+  it('testReadErrors', /** @suppress {checkTypes|visibility} */ function() {
+    // Calling readMessage on a non-delimited field should trigger an
+    // assertion.
+    var reader = jspb.BinaryReader.alloc([8, 1]);
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    reader.nextField();
+    assertThrows(function() {
+      reader.readMessage(dummyMessage, goog.nullFunction);
+    });
+
+    // Reading past the end of the stream should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([9, 1]);
+    reader.nextField();
+    assertThrows(function() {reader.readFixed64()});
+
+    // Reading past the end of a submessage should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([10, 4, 13, 1, 1, 1]);
+    reader.nextField();
+    reader.readMessage(dummyMessage, function() {
+      reader.nextField();
+      assertThrows(function() {reader.readFixed32()});
+    });
+
+    // Skipping an invalid field should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([12, 1]);
+    reader.nextWireType_ = 1000;
+    assertThrows(function() {reader.skipField()});
+
+    // Reading fields with the wrong wire type should assert.
+    reader = jspb.BinaryReader.alloc([9, 0, 0, 0, 0, 0, 0, 0, 0]);
+    reader.nextField();
+    assertThrows(function() {reader.readInt32()});
+    assertThrows(function() {reader.readInt32String()});
+    assertThrows(function() {reader.readInt64()});
+    assertThrows(function() {reader.readInt64String()});
+    assertThrows(function() {reader.readUint32()});
+    assertThrows(function() {reader.readUint32String()});
+    assertThrows(function() {reader.readUint64()});
+    assertThrows(function() {reader.readUint64String()});
+    assertThrows(function() {reader.readSint32()});
+    assertThrows(function() {reader.readBool()});
+    assertThrows(function() {reader.readEnum()});
+
+    reader = jspb.BinaryReader.alloc([8, 1]);
+    reader.nextField();
+    assertThrows(function() {reader.readFixed32()});
+    assertThrows(function() {reader.readFixed64()});
+    assertThrows(function() {reader.readSfixed32()});
+    assertThrows(function() {reader.readSfixed64()});
+    assertThrows(function() {reader.readFloat()});
+    assertThrows(function() {reader.readDouble()});
+
+    assertThrows(function() {reader.readString()});
+    assertThrows(function() {reader.readBytes()});
+  });
+
+
+  /**
+   * Tests encoding and decoding of unsigned field types.
+   * @param {Function} readField
+   * @param {Function} writeField
+   * @param {number} epsilon
+   * @param {number} upperLimit
+   * @param {Function} filter
+   * @private
+   * @suppress {missingProperties}
+   */
+  var doTestUnsignedField_ = function(readField,
+      writeField, epsilon, upperLimit, filter) {
+    assertNotNull(readField);
+    assertNotNull(writeField);
+
+    var writer = new jspb.BinaryWriter();
+
+    // Encode zero and limits.
+    writeField.call(writer, 1, filter(0));
+    writeField.call(writer, 2, filter(epsilon));
+    writeField.call(writer, 3, filter(upperLimit));
+
+    // Encode positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      writeField.call(writer, 4, filter(cursor));
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Check zero and limits.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(filter(0), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(filter(epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(filter(upperLimit), readField.call(reader));
+
+    // Check positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      reader.nextField();
+      if (4 != reader.getFieldNumber()) throw 'fail!';
+      if (filter(cursor) != readField.call(reader)) throw 'fail!';
+    }
+  };
+
+
+  /**
+   * Tests encoding and decoding of signed field types.
+   * @param {Function} readField
+   * @param {Function} writeField
+   * @param {number} epsilon
+   * @param {number} lowerLimit
+   * @param {number} upperLimit
+   * @param {Function} filter
+   * @private
+   * @suppress {missingProperties}
+   */
+  var doTestSignedField_ = function(readField,
+      writeField, epsilon, lowerLimit, upperLimit, filter) {
+    var writer = new jspb.BinaryWriter();
+
+    // Encode zero and limits.
+    writeField.call(writer, 1, filter(lowerLimit));
+    writeField.call(writer, 2, filter(-epsilon));
+    writeField.call(writer, 3, filter(0));
+    writeField.call(writer, 4, filter(epsilon));
+    writeField.call(writer, 5, filter(upperLimit));
+
+    var inputValues = [];
+
+    // Encode negative values.
+    for (var cursor = lowerLimit; cursor < -epsilon; cursor /= 1.1) {
+      var val = filter(cursor);
+      writeField.call(writer, 6, val);
+      inputValues.push({
+        fieldNumber: 6,
+        value: val
+      });
+    }
+
+    // Encode positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      var val = filter(cursor);
+      writeField.call(writer, 7, val);
+      inputValues.push({
+        fieldNumber: 7,
+        value: val
+      });
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Check zero and limits.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(filter(lowerLimit), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(filter(-epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(filter(0), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(4, reader.getFieldNumber());
+    assertEquals(filter(epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(5, reader.getFieldNumber());
+    assertEquals(filter(upperLimit), readField.call(reader));
+
+    for (var i = 0; i < inputValues.length; i++) {
+      var expected = inputValues[i];
+      reader.nextField();
+      assertEquals(expected.fieldNumber, reader.getFieldNumber());
+      assertEquals(expected.value, readField.call(reader));
+    }
+  };
+
+
+  /**
+   * Tests fields that use varint encoding.
+   */
+  it('testVarintFields', function() {
+    assertNotUndefined(jspb.BinaryReader.prototype.readUint32);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeUint32);
+    assertNotUndefined(jspb.BinaryReader.prototype.readUint64);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeUint64);
+    assertNotUndefined(jspb.BinaryReader.prototype.readBool);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeBool);
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readUint32,
+        jspb.BinaryWriter.prototype.writeUint32,
+        1, Math.pow(2, 32) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readUint64,
+        jspb.BinaryWriter.prototype.writeUint64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readInt32,
+        jspb.BinaryWriter.prototype.writeInt32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readInt64,
+        jspb.BinaryWriter.prototype.writeInt64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readEnum,
+        jspb.BinaryWriter.prototype.writeEnum,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readBool,
+        jspb.BinaryWriter.prototype.writeBool,
+        1, 1, function(x) { return !!x; });
+  });
+
+
+  /**
+   * Tests reading a field from hexadecimal string (format: '08 BE EF').
+   * @param {Function} readField
+   * @param {number} expected
+   * @param {string} hexString
+   */
+  function doTestHexStringVarint_(readField, expected, hexString) {
+    var bytesCount = (hexString.length + 1) / 3;
+    var bytes = new Uint8Array(bytesCount);
+    for (var i = 0; i < bytesCount; i++) {
+      bytes[i] = parseInt(hexString.substring(i * 3, i * 3 + 2), 16);
+    }
+    var reader = jspb.BinaryReader.alloc(bytes);
+    reader.nextField();
+    assertEquals(expected, readField.call(reader));
+  }
+
+
+  /**
+   * Tests non-canonical redundant varint decoding.
+   */
+  it('testRedundantVarintFields', function() {
+    assertNotNull(jspb.BinaryReader.prototype.readUint32);
+    assertNotNull(jspb.BinaryReader.prototype.readUint64);
+    assertNotNull(jspb.BinaryReader.prototype.readSint32);
+    assertNotNull(jspb.BinaryReader.prototype.readSint64);
+
+    // uint32 and sint32 take no more than 5 bytes
+    // 08 - field prefix (type = 0 means varint)
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readUint32,
+      12, '08 8C 80 80 80 00');
+
+    // 11 stands for -6 in zigzag encoding
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readSint32,
+      -6, '08 8B 80 80 80 00');
+
+    // uint64 and sint64 take no more than 10 bytes
+    // 08 - field prefix (type = 0 means varint)
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readUint64,
+      12, '08 8C 80 80 80 80 80 80 80 80 00');
+
+    // 11 stands for -6 in zigzag encoding
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readSint64,
+      -6, '08 8B 80 80 80 80 80 80 80 80 00');
+  });
+
+
+  /**
+   * Tests 64-bit fields that are handled as strings.
+   */
+  it('testStringInt64Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var testSignedData = [
+      '2730538252207801776',
+      '-2688470994844604560',
+      '3398529779486536359',
+      '3568577411627971000',
+      '272477188847484900',
+      '-6649058714086158188',
+      '-7695254765712060806',
+      '-4525541438037104029',
+      '-4993706538836508568',
+      '4990160321893729138'
+    ];
+    var testUnsignedData = [
+      '7822732630241694882',
+      '6753602971916687352',
+      '2399935075244442116',
+      '8724292567325338867',
+      '16948784802625696584',
+      '4136275908516066934',
+      '3575388346793700364',
+      '5167142028379259461',
+      '1557573948689737699',
+      '17100725280812548567'
+    ];
+
+    for (var i = 0; i < testSignedData.length; i++) {
+      writer.writeInt64String(2 * i + 1, testSignedData[i]);
+      writer.writeUint64String(2 * i + 2, testUnsignedData[i]);
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    for (var i = 0; i < testSignedData.length; i++) {
+      reader.nextField();
+      assertEquals(2 * i + 1, reader.getFieldNumber());
+      assertEquals(testSignedData[i], reader.readInt64String());
+      reader.nextField();
+      assertEquals(2 * i + 2, reader.getFieldNumber());
+      assertEquals(testUnsignedData[i], reader.readUint64String());
+    }
+  });
+
+
+  /**
+   * Tests fields that use zigzag encoding.
+   */
+  it('testZigzagFields', function() {
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSint32,
+        jspb.BinaryWriter.prototype.writeSint32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSint64,
+        jspb.BinaryWriter.prototype.writeSint64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests fields that use fixed-length encoding.
+   */
+  it('testFixedFields', function() {
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readFixed32,
+        jspb.BinaryWriter.prototype.writeFixed32,
+        1, Math.pow(2, 32) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readFixed64,
+        jspb.BinaryWriter.prototype.writeFixed64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSfixed32,
+        jspb.BinaryWriter.prototype.writeSfixed32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSfixed64,
+        jspb.BinaryWriter.prototype.writeSfixed64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests floating point fields.
+   */
+  it('testFloatFields', function() {
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readFloat,
+        jspb.BinaryWriter.prototype.writeFloat,
+        jspb.BinaryConstants.FLOAT32_MIN,
+        -jspb.BinaryConstants.FLOAT32_MAX,
+        jspb.BinaryConstants.FLOAT32_MAX,
+        truncate);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readDouble,
+        jspb.BinaryWriter.prototype.writeDouble,
+        jspb.BinaryConstants.FLOAT64_EPS * 10,
+        -jspb.BinaryConstants.FLOAT64_MIN,
+        jspb.BinaryConstants.FLOAT64_MIN,
+        function(x) { return x; });
+  });
+
+
+  /**
+   * Tests length-delimited string fields.
+   */
+  it('testStringFields', function() {
+    var s1 = 'The quick brown fox jumps over the lazy dog.';
+    var s2 = '人人生而自由，在尊嚴和權利上一律平等。';
+
+    var writer = new jspb.BinaryWriter();
+
+    writer.writeString(1, s1);
+    writer.writeString(2, s2);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(s1, reader.readString());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(s2, reader.readString());
+  });
+
+
+  /**
+   * Tests length-delimited byte fields.
+   */
+  it('testByteFields', function() {
+    var message = [];
+    var lowerLimit = 1;
+    var upperLimit = 256;
+    var scale = 1.1;
+
+    var writer = new jspb.BinaryWriter();
+
+    for (var cursor = lowerLimit; cursor < upperLimit; cursor *= 1.1) {
+      var len = Math.round(cursor);
+      var bytes = [];
+      for (var i = 0; i < len; i++) bytes.push(i % 256);
+
+      writer.writeBytes(len, bytes);
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    for (var cursor = lowerLimit; reader.nextField(); cursor *= 1.1) {
+      var len = Math.round(cursor);
+      if (len != reader.getFieldNumber()) throw 'fail!';
+
+      var bytes = reader.readBytes();
+      if (len != bytes.length) throw 'fail!';
+      for (var i = 0; i < bytes.length; i++) {
+        if (i % 256 != bytes[i]) throw 'fail!';
+      }
+    }
+  });
+
+
+  /**
+   * Tests nested messages.
+   */
+  it('testNesting', function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    writer.writeInt32(1, 100);
+
+    // Add one message with 3 int fields.
+    writer.writeMessage(2, dummyMessage, function() {
+      writer.writeInt32(3, 300);
+      writer.writeInt32(4, 400);
+      writer.writeInt32(5, 500);
+    });
+
+    // Add one empty message.
+    writer.writeMessage(6, dummyMessage, goog.nullFunction);
+
+    writer.writeInt32(7, 700);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Validate outermost message.
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(100, reader.readInt32());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Validate embedded message 1.
+      reader.nextField();
+      assertEquals(3, reader.getFieldNumber());
+      assertEquals(300, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(4, reader.getFieldNumber());
+      assertEquals(400, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(5, reader.getFieldNumber());
+      assertEquals(500, reader.readInt32());
+
+      assertEquals(false, reader.nextField());
+    });
+
+    reader.nextField();
+    assertEquals(6, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Validate embedded message 2.
+
+      assertEquals(false, reader.nextField());
+    });
+
+    reader.nextField();
+    assertEquals(7, reader.getFieldNumber());
+    assertEquals(700, reader.readInt32());
+
+    assertEquals(false, reader.nextField());
+  });
+
+  /**
+   * Tests skipping fields of each type by interleaving them with sentinel
+   * values and skipping everything that's not a sentinel.
+   */
+  it('testSkipField', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var sentinel = 123456789;
+
+    // Write varint fields of different sizes.
+    writer.writeInt32(1, sentinel);
+    writer.writeInt32(1, 1);
+    writer.writeInt32(1, 1000);
+    writer.writeInt32(1, 1000000);
+    writer.writeInt32(1, 1000000000);
+
+    // Write fixed 64-bit encoded fields.
+    writer.writeInt32(2, sentinel);
+    writer.writeDouble(2, 1);
+    writer.writeFixed64(2, 1);
+    writer.writeSfixed64(2, 1);
+
+    // Write fixed 32-bit encoded fields.
+    writer.writeInt32(3, sentinel);
+    writer.writeFloat(3, 1);
+    writer.writeFixed32(3, 1);
+    writer.writeSfixed32(3, 1);
+
+    // Write delimited fields.
+    writer.writeInt32(4, sentinel);
+    writer.writeBytes(4, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+    writer.writeString(4, 'The quick brown fox jumps over the lazy dog');
+
+    // Write a group with a nested group inside.
+    writer.writeInt32(5, sentinel);
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    writer.writeGroup(5, dummyMessage, function() {
+      writer.writeInt64(42, 42);
+      writer.writeGroup(6, dummyMessage, function() {
+        writer.writeInt64(84, 42);
+      });
+    });
+
+    // Write final sentinel.
+    writer.writeInt32(6, sentinel);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    function skip(field, count) {
+      for (var i = 0; i < count; i++) {
+        reader.nextField();
+        if (field != reader.getFieldNumber()) throw 'fail!';
+        reader.skipField();
+      }
+    }
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(1, 4);
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(2, 3);
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(3, 3);
+
+    reader.nextField();
+    assertEquals(4, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(4, 2);
+
+    reader.nextField();
+    assertEquals(5, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(5, 1);
+
+    reader.nextField();
+    assertEquals(6, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+  });
+
+
+  /**
+   * Tests packed fields.
+   */
+  it('testPackedFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var sentinel = 123456789;
+
+    var unsignedData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+    var signedData = [-1, 2, -3, 4, -5, 6, -7, 8, -9, 10];
+    var floatData = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.10];
+    var doubleData = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.10];
+    var boolData = [true, false, true, true, false, false, true, false];
+
+    for (var i = 0; i < floatData.length; i++) {
+      floatData[i] = truncate(floatData[i]);
+    }
+
+    writer.writeInt32(1, sentinel);
+
+    writer.writePackedInt32(2, signedData);
+    writer.writePackedInt64(2, signedData);
+    writer.writePackedUint32(2, unsignedData);
+    writer.writePackedUint64(2, unsignedData);
+    writer.writePackedSint32(2, signedData);
+    writer.writePackedSint64(2, signedData);
+    writer.writePackedFixed32(2, unsignedData);
+    writer.writePackedFixed64(2, unsignedData);
+    writer.writePackedSfixed32(2, signedData);
+    writer.writePackedSfixed64(2, signedData);
+    writer.writePackedFloat(2, floatData);
+    writer.writePackedDouble(2, doubleData);
+    writer.writePackedBool(2, boolData);
+    writer.writePackedEnum(2, unsignedData);
+
+    writer.writeInt32(3, sentinel);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    reader.nextField();
+    assertEquals(sentinel, reader.readInt32());
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedInt32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedInt64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedUint32(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedUint64(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSint32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSint64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFixed32(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFixed64(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSfixed32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSfixed64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFloat(), floatData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedDouble(), doubleData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedBool(), boolData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedEnum(), unsignedData);
+
+    reader.nextField();
+    assertEquals(sentinel, reader.readInt32());
+  });
+
+
+  /**
+   * Byte blobs inside nested messages should always have their byte offset set
+   * relative to the start of the outermost blob, not the start of their parent
+   * blob.
+   */
+  it('testNestedBlobs', function() {
+    // Create a proto consisting of two nested messages, with the inner one
+    // containing a blob of bytes.
+
+    var fieldTag = (1 << 3) | jspb.BinaryConstants.WireType.DELIMITED;
+    var blob = [1, 2, 3, 4, 5];
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    writer.writeMessage(1, dummyMessage, function() {
+      writer.writeMessage(1, dummyMessage, function() {
+        writer.writeBytes(1, blob);
+      });
+    });
+
+    // Peel off the outer two message layers. Each layer should have two bytes
+    // of overhead, one for the field tag and one for the length of the inner
+    // blob.
+
+    var decoder1 = new jspb.BinaryDecoder(writer.getResultBuffer());
+    assertEquals(fieldTag, decoder1.readUnsignedVarint32());
+    assertEquals(blob.length + 4, decoder1.readUnsignedVarint32());
+
+    var decoder2 = new jspb.BinaryDecoder(decoder1.readBytes(blob.length + 4));
+    assertEquals(fieldTag, decoder2.readUnsignedVarint32());
+    assertEquals(blob.length + 2, decoder2.readUnsignedVarint32());
+
+    assertEquals(fieldTag, decoder2.readUnsignedVarint32());
+    assertEquals(blob.length, decoder2.readUnsignedVarint32());
+    var bytes = decoder2.readBytes(blob.length);
+
+    assertElementsEquals(bytes, blob);
+  });
+
+
+  /**
+   * Tests read callbacks.
+   */
+  it('testReadCallbacks', function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    // Add an int, a submessage, and another int.
+    writer.writeInt32(1, 100);
+
+    writer.writeMessage(2, dummyMessage, function() {
+      writer.writeInt32(3, 300);
+      writer.writeInt32(4, 400);
+      writer.writeInt32(5, 500);
+    });
+
+    writer.writeInt32(7, 700);
+
+    // Create the reader and register a custom read callback.
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    /**
+     * @param {!jspb.BinaryReader} reader
+     * @return {*}
+     */
+    function readCallback(reader) {
+      reader.nextField();
+      assertEquals(3, reader.getFieldNumber());
+      assertEquals(300, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(4, reader.getFieldNumber());
+      assertEquals(400, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(5, reader.getFieldNumber());
+      assertEquals(500, reader.readInt32());
+
+      assertEquals(false, reader.nextField());
+    };
+
+    reader.registerReadCallback('readCallback', readCallback);
+
+    // Read the container message.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(100, reader.readInt32());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Decode the embedded message using the registered callback.
+      reader.runReadCallback('readCallback');
+    });
+
+    reader.nextField();
+    assertEquals(7, reader.getFieldNumber());
+    assertEquals(700, reader.readInt32());
+
+    assertEquals(false, reader.nextField());
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/binary/utils_test.js b/js/compatibility_tests/v3.0.0/binary/utils_test.js
new file mode 100644
index 00000000..d27e5ea2
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/utils_test.js
@@ -0,0 +1,668 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's helper functions.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryWriter');
+goog.require('jspb.utils');
+
+
+/**
+ * @param {number} x
+ * @return {number}
+ */
+function truncate(x) {
+  var temp = new Float32Array(1);
+  temp[0] = x;
+  return temp[0];
+}
+
+
+/**
+ * Converts an 64-bit integer in split representation to a 64-bit hash string
+ * (8 bits encoded per character).
+ * @param {number} bitsLow The low 32 bits of the split 64-bit integer.
+ * @param {number} bitsHigh The high 32 bits of the split 64-bit integer.
+ * @return {string} The encoded hash string, 8 bits per character.
+ */
+function toHashString(bitsLow, bitsHigh) {
+  return String.fromCharCode((bitsLow >>> 0) & 0xFF,
+                             (bitsLow >>> 8) & 0xFF,
+                             (bitsLow >>> 16) & 0xFF,
+                             (bitsLow >>> 24) & 0xFF,
+                             (bitsHigh >>> 0) & 0xFF,
+                             (bitsHigh >>> 8) & 0xFF,
+                             (bitsHigh >>> 16) & 0xFF,
+                             (bitsHigh >>> 24) & 0xFF);
+}
+
+
+describe('binaryUtilsTest', function() {
+  /**
+   * Tests lossless binary-to-decimal conversion.
+   */
+  it('testDecimalConversion', function() {
+    // Check some magic numbers.
+    var result =
+        jspb.utils.joinUnsignedDecimalString(0x89e80001, 0x8ac72304);
+    assertEquals('10000000000000000001', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xacd05f15, 0x1b69b4b);
+    assertEquals('123456789123456789', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xeb1f0ad2, 0xab54a98c);
+    assertEquals('12345678901234567890', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xe3b70cb1, 0x891087b8);
+    assertEquals('9876543210987654321', result);
+
+    // Check limits.
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00000000);
+    assertEquals('0', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xFFFFFFFF, 0xFFFFFFFF);
+    assertEquals('18446744073709551615', result);
+
+    // Check each bit of the low dword.
+    for (var i = 0; i < 32; i++) {
+      var low = (1 << i) >>> 0;
+      result = jspb.utils.joinUnsignedDecimalString(low, 0);
+      assertEquals('' + Math.pow(2, i), result);
+    }
+
+    // Check the first 20 bits of the high dword.
+    for (var i = 0; i < 20; i++) {
+      var high = (1 << i) >>> 0;
+      result = jspb.utils.joinUnsignedDecimalString(0, high);
+      assertEquals('' + Math.pow(2, 32 + i), result);
+    }
+
+    // V8's internal double-to-string conversion is inaccurate for values above
+    // 2^52, even if they're representable integers - check the rest of the bits
+    // manually against the correct string representations of 2^N.
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00100000);
+    assertEquals('4503599627370496', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00200000);
+    assertEquals('9007199254740992', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00400000);
+    assertEquals('18014398509481984', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00800000);
+    assertEquals('36028797018963968', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x01000000);
+    assertEquals('72057594037927936', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x02000000);
+    assertEquals('144115188075855872', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x04000000);
+    assertEquals('288230376151711744', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x08000000);
+    assertEquals('576460752303423488', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x10000000);
+    assertEquals('1152921504606846976', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x20000000);
+    assertEquals('2305843009213693952', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x40000000);
+    assertEquals('4611686018427387904', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x80000000);
+    assertEquals('9223372036854775808', result);
+  });
+
+
+  /**
+   * Going from hash strings to decimal strings should also be lossless.
+   */
+  it('testHashToDecimalConversion', function() {
+    var result;
+    var convert = jspb.utils.hash64ToDecimalString;
+
+    result = convert(toHashString(0x00000000, 0x00000000), false);
+    assertEquals('0', result);
+
+    result = convert(toHashString(0x00000000, 0x00000000), true);
+    assertEquals('0', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF), false);
+    assertEquals('18446744073709551615', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF), true);
+    assertEquals('-1', result);
+
+    result = convert(toHashString(0x00000000, 0x80000000), false);
+    assertEquals('9223372036854775808', result);
+
+    result = convert(toHashString(0x00000000, 0x80000000), true);
+    assertEquals('-9223372036854775808', result);
+
+    result = convert(toHashString(0xacd05f15, 0x01b69b4b), false);
+    assertEquals('123456789123456789', result);
+
+    result = convert(toHashString(~0xacd05f15 + 1, ~0x01b69b4b), true);
+    assertEquals('-123456789123456789', result);
+
+    // And converting arrays of hashes should work the same way.
+    result = jspb.utils.hash64ArrayToDecimalStrings([
+      toHashString(0xFFFFFFFF, 0xFFFFFFFF),
+      toHashString(0x00000000, 0x80000000),
+      toHashString(0xacd05f15, 0x01b69b4b)], false);
+    assertEquals(3, result.length);
+    assertEquals('18446744073709551615', result[0]);
+    assertEquals('9223372036854775808', result[1]);
+    assertEquals('123456789123456789', result[2]);
+  });
+
+  /*
+   * Going from decimal strings to hash strings should be lossless.
+   */
+  it('testDecimalToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.decimalStringToHash64;
+
+    result = convert('0');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
+
+    result = convert('-1');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    result = convert('18446744073709551615');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    result = convert('9223372036854775808');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
+
+    result = convert('-9223372036854775808');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
+
+    result = convert('123456789123456789');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x15, 0x5F, 0xD0, 0xAC, 0x4B, 0x9B, 0xB6, 0x01]), result);
+
+    result = convert('-123456789123456789');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xEB, 0xA0, 0x2F, 0x53, 0xB4, 0x64, 0x49, 0xFE]), result);
+  });
+
+  /**
+   * Going from hash strings to hex strings should be lossless.
+   */
+  it('testHashToHexConversion', function() {
+    var result;
+    var convert = jspb.utils.hash64ToHexString;
+
+    result = convert(toHashString(0x00000000, 0x00000000));
+    assertEquals('0x0000000000000000', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF));
+    assertEquals('0xffffffffffffffff', result);
+
+    result = convert(toHashString(0x12345678, 0x9ABCDEF0));
+    assertEquals('0x9abcdef012345678', result);
+  });
+
+
+  /**
+   * Going from hex strings to hash strings should be lossless.
+   */
+  it('testHexToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.hexStringToHash64;
+
+    result = convert('0x0000000000000000');
+    assertEquals(String.fromCharCode.apply(null,
+        [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
+
+    result = convert('0xffffffffffffffff');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    // Hex string is big-endian, hash string is little-endian.
+    result = convert('0x123456789ABCDEF0');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12]), result);
+
+    // Capitalization should not matter.
+    result = convert('0x0000abcdefABCDEF');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB, 0x00, 0x00]), result);
+  });
+
+
+  /**
+   * Going from numbers to hash strings should be lossless for up to 53 bits of
+   * precision.
+   */
+  it('testNumberToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.numberToHash64;
+
+    result = convert(0x0000000000000);
+    assertEquals('0x0000000000000000', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0xFFFFFFFFFFFFF);
+    assertEquals('0x000fffffffffffff', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0x123456789ABCD);
+    assertEquals('0x000123456789abcd', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0xDCBA987654321);
+    assertEquals('0x000dcba987654321', jspb.utils.hash64ToHexString(result));
+
+    // 53 bits of precision should not be truncated.
+    result = convert(0x10000000000001);
+    assertEquals('0x0010000000000001', jspb.utils.hash64ToHexString(result));
+
+    // 54 bits of precision should be truncated.
+    result = convert(0x20000000000001);
+    assertNotEquals(
+        '0x0020000000000001', jspb.utils.hash64ToHexString(result));
+  });
+
+
+  /**
+   * Sanity check the behavior of Javascript's strings when doing funny things
+   * with unicode characters.
+   */
+  it('sanityCheckUnicodeStrings', function() {
+    var strings = new Array(65536);
+
+    // All possible unsigned 16-bit values should be storable in a string, they
+    // shouldn't do weird things with the length of the string, and they should
+    // come back out of the string unchanged.
+    for (var i = 0; i < 65536; i++) {
+      strings[i] = 'a' + String.fromCharCode(i) + 'a';
+      if (3 != strings[i].length) throw 'fail!';
+      if (i != strings[i].charCodeAt(1)) throw 'fail!';
+    }
+
+    // Each unicode character should compare equal to itself and not equal to a
+    // different unicode character.
+    for (var i = 0; i < 65536; i++) {
+      if (strings[i] != strings[i]) throw 'fail!';
+      if (strings[i] == strings[(i + 1) % 65536]) throw 'fail!';
+    }
+  });
+
+
+  /**
+   * Tests conversion from 32-bit floating point numbers to split64 numbers.
+   */
+  it('testFloat32ToSplit64', function() {
+    var f32_eps = jspb.BinaryConstants.FLOAT32_EPS;
+    var f32_min = jspb.BinaryConstants.FLOAT32_MIN;
+    var f32_max = jspb.BinaryConstants.FLOAT32_MAX;
+
+    // NaN.
+    jspb.utils.splitFloat32(NaN);
+    if (!isNaN(jspb.utils.joinFloat32(jspb.utils.split64Low,
+                                      jspb.utils.split64High))) {
+      throw 'fail!';
+    }
+
+    /**
+     * @param {number} x
+     * @param {number=} opt_bits
+     */
+    function test(x, opt_bits) {
+      jspb.utils.splitFloat32(x);
+      if (goog.isDef(opt_bits)) {
+        if (opt_bits != jspb.utils.split64Low) throw 'fail!';
+      }
+      if (truncate(x) != jspb.utils.joinFloat32(jspb.utils.split64Low,
+          jspb.utils.split64High)) {
+        throw 'fail!';
+      }
+    }
+
+    // Positive and negative infinity.
+    test(Infinity, 0x7f800000);
+    test(-Infinity, 0xff800000);
+
+    // Positive and negative zero.
+    test(0, 0x00000000);
+    test(-0, 0x80000000);
+
+    // Positive and negative epsilon.
+    test(f32_eps, 0x00000001);
+    test(-f32_eps, 0x80000001);
+
+    // Positive and negative min.
+    test(f32_min, 0x00800000);
+    test(-f32_min, 0x80800000);
+
+    // Positive and negative max.
+    test(f32_max, 0x7F7FFFFF);
+    test(-f32_max, 0xFF7FFFFF);
+
+    // Various positive values.
+    var cursor = f32_eps * 10;
+    while (cursor != Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+
+    // Various negative values.
+    cursor = -f32_eps * 10;
+    while (cursor != -Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+  });
+
+
+  /**
+   * Tests conversion from 64-bit floating point numbers to split64 numbers.
+   */
+  it('testFloat64ToSplit64', function() {
+    var f64_eps = jspb.BinaryConstants.FLOAT64_EPS;
+    var f64_min = jspb.BinaryConstants.FLOAT64_MIN;
+    var f64_max = jspb.BinaryConstants.FLOAT64_MAX;
+
+    // NaN.
+    jspb.utils.splitFloat64(NaN);
+    if (!isNaN(jspb.utils.joinFloat64(jspb.utils.split64Low,
+        jspb.utils.split64High))) {
+      throw 'fail!';
+    }
+
+    /**
+     * @param {number} x
+     * @param {number=} opt_highBits
+     * @param {number=} opt_lowBits
+     */
+    function test(x, opt_highBits, opt_lowBits) {
+      jspb.utils.splitFloat64(x);
+      if (goog.isDef(opt_highBits)) {
+        if (opt_highBits != jspb.utils.split64High) throw 'fail!';
+      }
+      if (goog.isDef(opt_lowBits)) {
+        if (opt_lowBits != jspb.utils.split64Low) throw 'fail!';
+      }
+      if (x != jspb.utils.joinFloat64(jspb.utils.split64Low,
+          jspb.utils.split64High)) {
+        throw 'fail!';
+      }
+    }
+
+    // Positive and negative infinity.
+    test(Infinity, 0x7ff00000, 0x00000000);
+    test(-Infinity, 0xfff00000, 0x00000000);
+
+    // Positive and negative zero.
+    test(0, 0x00000000, 0x00000000);
+    test(-0, 0x80000000, 0x00000000);
+
+    // Positive and negative epsilon.
+    test(f64_eps, 0x00000000, 0x00000001);
+    test(-f64_eps, 0x80000000, 0x00000001);
+
+    // Positive and negative min.
+    test(f64_min, 0x00100000, 0x00000000);
+    test(-f64_min, 0x80100000, 0x00000000);
+
+    // Positive and negative max.
+    test(f64_max, 0x7FEFFFFF, 0xFFFFFFFF);
+    test(-f64_max, 0xFFEFFFFF, 0xFFFFFFFF);
+
+    // Various positive values.
+    var cursor = f64_eps * 10;
+    while (cursor != Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+
+    // Various negative values.
+    cursor = -f64_eps * 10;
+    while (cursor != -Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+  });
+
+
+  /**
+   * Tests counting packed varints.
+   */
+  it('testCountVarints', function() {
+    var values = [];
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      values.push(Math.floor(i));
+    }
+
+    var writer = new jspb.BinaryWriter();
+    writer.writePackedUint64(1, values);
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+
+    // We should have two more varints than we started with - one for the field
+    // tag, one for the packed length.
+    assertEquals(values.length + 2,
+                 jspb.utils.countVarints(buffer, 0, buffer.length));
+  });
+
+
+  /**
+   * Tests counting matching varint fields.
+   */
+  it('testCountVarintFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeUint64(1, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countVarintFields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeUint64(123456789, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countVarintFields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching fixed32 fields.
+   */
+  it('testCountFixed32Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeFixed32(1, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed32Fields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeFixed32(123456789, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed32Fields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching fixed64 fields.
+   */
+  it('testCountFixed64Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeDouble(1, i);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed64Fields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeDouble(123456789, i);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed64Fields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching delimited fields.
+   */
+  it('testCountDelimitedFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000; i *= 1.1) {
+      writer.writeBytes(1, [Math.floor(i)]);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countDelimitedFields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000; i *= 1.1) {
+      writer.writeBytes(123456789, [Math.floor(i)]);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countDelimitedFields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests byte format for debug strings.
+   */
+  it('testDebugBytesToTextFormat', function() {
+    assertEquals('""', jspb.utils.debugBytesToTextFormat(null));
+    assertEquals('"\\x00\\x10\\xff"',
+        jspb.utils.debugBytesToTextFormat([0, 16, 255]));
+  });
+
+
+  /**
+   * Tests converting byte blob sources into byte blobs.
+   */
+  it('testByteSourceToUint8Array', function() {
+    var convert = jspb.utils.byteSourceToUint8Array;
+
+    var sourceData = [];
+    for (var i = 0; i < 256; i++) {
+      sourceData.push(i);
+    }
+
+    var sourceBytes = new Uint8Array(sourceData);
+    var sourceBuffer = sourceBytes.buffer;
+    var sourceBase64 = goog.crypt.base64.encodeByteArray(sourceData);
+    var sourceString = String.fromCharCode.apply(null, sourceData);
+
+    function check(result) {
+      assertEquals(Uint8Array, result.constructor);
+      assertEquals(sourceData.length, result.length);
+      for (var i = 0; i < result.length; i++) {
+        assertEquals(sourceData[i], result[i]);
+      }
+    }
+
+    // Converting Uint8Arrays into Uint8Arrays should be a no-op.
+    assertEquals(sourceBytes, convert(sourceBytes));
+
+    // Converting Array.<numbers> into Uint8Arrays should work.
+    check(convert(sourceData));
+
+    // Converting ArrayBuffers into Uint8Arrays should work.
+    check(convert(sourceBuffer));
+
+    // Converting base64-encoded strings into Uint8Arrays should work.
+    check(convert(sourceBase64));
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/binary/writer_test.js b/js/compatibility_tests/v3.0.0/binary/writer_test.js
new file mode 100644
index 00000000..d5dadb41
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/binary/writer_test.js
@@ -0,0 +1,122 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer writer. In
+ * practice BinaryWriter is used to drive the Decoder and Reader test cases,
+ * so only writer-specific tests are here.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.crypt');
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryWriter');
+
+
+/**
+ * @param {function()} func This function should throw an error when run.
+ */
+function assertFails(func) {
+  var e = assertThrows(func);
+  //assertNotNull(e.toString().match(/Error/));
+}
+
+
+describe('binaryWriterTest', function() {
+  /**
+   * Verifies that misuse of the writer class triggers assertions.
+   */
+  it('testWriteErrors', function() {
+    // Submessages with invalid field indices should assert.
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    assertFails(function() {
+      writer.writeMessage(-1, dummyMessage, goog.nullFunction);
+    });
+
+    // Writing invalid field indices should assert.
+    writer = new jspb.BinaryWriter();
+    assertFails(function() {writer.writeUint64(-1, 1);});
+
+    // Writing out-of-range field values should assert.
+    writer = new jspb.BinaryWriter();
+
+    assertFails(function() {writer.writeInt32(1, -Infinity);});
+    assertFails(function() {writer.writeInt32(1, Infinity);});
+
+    assertFails(function() {writer.writeInt64(1, -Infinity);});
+    assertFails(function() {writer.writeInt64(1, Infinity);});
+
+    assertFails(function() {writer.writeUint32(1, -1);});
+    assertFails(function() {writer.writeUint32(1, Infinity);});
+
+    assertFails(function() {writer.writeUint64(1, -1);});
+    assertFails(function() {writer.writeUint64(1, Infinity);});
+
+    assertFails(function() {writer.writeSint32(1, -Infinity);});
+    assertFails(function() {writer.writeSint32(1, Infinity);});
+
+    assertFails(function() {writer.writeSint64(1, -Infinity);});
+    assertFails(function() {writer.writeSint64(1, Infinity);});
+
+    assertFails(function() {writer.writeFixed32(1, -1);});
+    assertFails(function() {writer.writeFixed32(1, Infinity);});
+
+    assertFails(function() {writer.writeFixed64(1, -1);});
+    assertFails(function() {writer.writeFixed64(1, Infinity);});
+
+    assertFails(function() {writer.writeSfixed32(1, -Infinity);});
+    assertFails(function() {writer.writeSfixed32(1, Infinity);});
+
+    assertFails(function() {writer.writeSfixed64(1, -Infinity);});
+    assertFails(function() {writer.writeSfixed64(1, Infinity);});
+  });
+
+
+  /**
+   * Basic test of retrieving the result as a Uint8Array buffer
+   */
+  it('testGetResultBuffer', function() {
+    var expected = '0864120b48656c6c6f20776f726c641a0301020320c801';
+
+    var writer = new jspb.BinaryWriter();
+    writer.writeUint32(1, 100);
+    writer.writeString(2, 'Hello world');
+    writer.writeBytes(3, new Uint8Array([1, 2, 3]));
+    writer.writeUint32(4, 200);
+
+    var buffer = writer.getResultBuffer();
+    assertEquals(expected, goog.crypt.byteArrayToHex(buffer));
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/commonjs/export_asserts.js b/js/compatibility_tests/v3.0.0/commonjs/export_asserts.js
new file mode 100644
index 00000000..5219d120
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/export_asserts.js
@@ -0,0 +1,37 @@
+/**
+ * @fileoverview Exports symbols needed only by tests.
+ *
+ * This file exports several Closure Library symbols that are only
+ * used by tests.  It is used to generate a file
+ * closure_asserts_commonjs.js that is only used at testing time.
+ */
+
+goog.require('goog.testing.asserts');
+
+var global = Function('return this')();
+
+// All of the closure "assert" functions are exported at the global level.
+//
+// The Google Closure assert functions start with assert, eg.
+//   assertThrows
+//   assertNotThrows
+//   assertTrue
+//   ...
+//
+// The one exception is the "fail" function.
+function shouldExport(str) {
+  return str.lastIndexOf('assert') === 0 || str == 'fail';
+}
+
+for (var key in global) {
+  if ((typeof key == "string") && global.hasOwnProperty(key) &&
+      shouldExport(key)) {
+    exports[key] = global[key];
+  }
+}
+
+// The COMPILED variable is set by Closure compiler to "true" when it compiles
+// JavaScript, so in practice this is equivalent to "exports.COMPILED = true".
+// This will disable some debugging functionality in debug.js.  We could
+// investigate whether this can/should be enabled in CommonJS builds.
+exports.COMPILED = COMPILED
diff --git a/js/compatibility_tests/v3.0.0/commonjs/export_testdeps.js b/js/compatibility_tests/v3.0.0/commonjs/export_testdeps.js
new file mode 100644
index 00000000..59c77ca2
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/export_testdeps.js
@@ -0,0 +1,18 @@
+/**
+ * @fileoverview Export symbols needed by tests in CommonJS style.
+ *
+ * This file is like export.js, but for symbols that are only used by tests.
+ * However we exclude assert functions here, because they are exported into
+ * the global namespace, so those are handled as a special case in
+ * export_asserts.js.
+ */
+
+goog.require('goog.crypt.base64');
+goog.require('jspb.arith.Int64');
+goog.require('jspb.arith.UInt64');
+goog.require('jspb.BinaryEncoder');
+goog.require('jspb.BinaryDecoder');
+goog.require('jspb.utils');
+
+exports.goog = goog;
+exports.jspb = jspb;
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto b/js/compatibility_tests/v3.0.0/commonjs/import_test.js
index 406ab774..ffa34fea 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nano.proto
+++ b/js/compatibility_tests/v3.0.0/commonjs/import_test.js
@@ -1,5 +1,5 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
+// Copyright 2016 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -28,36 +28,25 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+// Test suite is written using Jasmine -- see http://jasmine.github.io/
 
-package protobuf_unittest_import;
 
-import "google/protobuf/nano/unittest_import_nano.proto";
 
-option java_package = "com.google.protobuf";
-option java_multiple_files = true;
+var googleProtobuf = require('google-protobuf');
+var asserts = require('closure_asserts_commonjs');
+var global = Function('return this')();
 
-enum FileScopeEnum {
-  ONE = 1;
-  TWO = 2;
-}
+// Bring asserts into the global namespace.
+googleProtobuf.object.extend(global, asserts);
+googleProtobuf.exportSymbol('jspb.Message', googleProtobuf.Message, global);
 
-message FileScopeEnumRefNano {
-  optional FileScopeEnum enum_field = 1;
-}
+var test7_pb = require('./test7/test7_pb');
+googleProtobuf.exportSymbol('proto.jspb.test.framing.FramingMessage', test7_pb.FramingMessage, global);
 
-message MessageScopeEnumRefNano {
-  enum MessageScopeEnum {
-    ONE = 1;
-    TWO = 2;
-  }
-  optional MessageScopeEnum enum_field = 1;
-}
-
-message MultipleImportingNonMultipleNano1 {
-  optional ImportMessageNano field = 1;
-}
-
-message MultipleImportingNonMultipleNano2 {
-  optional MultipleImportingNonMultipleNano1 nano1 = 1;
-}
+describe('Import test suite', function() {
+  it('testImportedMessage', function() {
+    var framing1 = new proto.jspb.test.framing.FramingMessage([]);
+    var framing2 = new proto.jspb.test.framing.FramingMessage([]);
+    assertObjectEquals(framing1.toObject(), framing2.toObject());
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/commonjs/jasmine.json b/js/compatibility_tests/v3.0.0/commonjs/jasmine.json
new file mode 100644
index 00000000..666b8edb
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/jasmine.json
@@ -0,0 +1,9 @@
+{
+    "spec_dir": "",
+    "spec_files": [
+        "*_test.js",
+        "binary/proto_test.js"
+    ],
+    "helpers": [
+    ]
+}
diff --git a/js/compatibility_tests/v3.0.0/commonjs/rewrite_tests_for_commonjs.js b/js/compatibility_tests/v3.0.0/commonjs/rewrite_tests_for_commonjs.js
new file mode 100644
index 00000000..b6d90d28
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/rewrite_tests_for_commonjs.js
@@ -0,0 +1,97 @@
+/**
+ * @fileoverview Utility to translate test files to CommonJS imports.
+ *
+ * This is a somewhat hacky tool designed to do one very specific thing.
+ * All of the test files in *_test.js are written with Closure-style
+ * imports (goog.require()).  This works great for running the tests
+ * against Closure-style generated code, but we also want to run the
+ * tests against CommonJS-style generated code without having to fork
+ * the tests.
+ *
+ * Closure-style imports import each individual type by name.  This is
+ * very different than CommonJS imports which are by file.  So we put
+ * special comments in these tests like:
+ *
+ * // CommonJS-LoadFromFile: test_pb
+ * goog.require('proto.jspb.test.CloneExtension');
+ * goog.require('proto.jspb.test.Complex');
+ * goog.require('proto.jspb.test.DefaultValues');
+ *
+ * This script parses that special comment and uses it to generate proper
+ * CommonJS require() statements so that the tests can run and pass using
+ * CommonJS imports.  The script will change the above statements into:
+ *
+ *   var test_pb = require('test_pb');
+ *   googleProtobuf.exportSymbol('proto.jspb.test.CloneExtension', test_pb.CloneExtension, global);
+ *   googleProtobuf.exportSymbol('proto.jspb.test.Complex', test_pb.Complex, global);
+ *   googleProtobuf.exportSymbol('proto.jspb.test.DefaultValues', test_pb.DefaultValues, global);
+ *
+ * (The "exportSymbol" function will define the given names in the global
+ * namespace, taking care not to overwrite any previous value for
+ * "proto.jspb.test").
+ */
+
+var lineReader = require('readline').createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+function tryStripPrefix(str, prefix) {
+  if (str.lastIndexOf(prefix) !== 0) {
+    throw "String: " + str + " didn't start with: " + prefix;
+  }
+  return str.substr(prefix.length);
+}
+
+function camelCase(str) {
+  var ret = '';
+  var ucaseNext = false;
+  for (var i = 0; i < str.length; i++) {
+    if (str[i] == '-') {
+      ucaseNext = true;
+    } else if (ucaseNext) {
+      ret += str[i].toUpperCase();
+      ucaseNext = false;
+    } else {
+      ret += str[i];
+    }
+  }
+  return ret;
+}
+
+var module = null;
+var pkg = null;
+
+// Header: goes in every file at the top.
+console.log("var global = Function('return this')();");
+console.log("var googleProtobuf = require('google-protobuf');");
+console.log("var testdeps = require('testdeps_commonjs');");
+console.log("global.goog = testdeps.goog;");
+console.log("global.jspb = testdeps.jspb;");
+console.log("var asserts = require('closure_asserts_commonjs');");
+console.log("");
+console.log("// Bring asserts into the global namespace.");
+console.log("googleProtobuf.object.extend(global, asserts);");
+
+lineReader.on('line', function(line) {
+  var isRequire = line.match(/goog\.require\('([^']*)'\)/);
+  var isLoadFromFile = line.match(/CommonJS-LoadFromFile: (\S*) (.*)/);
+  var isSetTestOnly = line.match(/goog.setTestOnly()/);
+  if (isRequire) {
+    if (module) {  // Skip goog.require() lines before the first directive.
+      var fullSym = isRequire[1];
+      var sym = tryStripPrefix(fullSym, pkg);
+      console.log("googleProtobuf.exportSymbol('" + fullSym + "', " + module + sym + ', global);');
+    }
+  } else if (isLoadFromFile) {
+    var module_path = isLoadFromFile[1].split('/');
+    module = camelCase(module_path[module_path.length - 1]);
+    pkg = isLoadFromFile[2];
+
+    if (module != "googleProtobuf") {  // We unconditionally require this in the header.
+      console.log("var " + module + " = require('./" + isLoadFromFile[1] + "');");
+    }
+  } else if (!isSetTestOnly) {  // Remove goog.setTestOnly() lines.
+    console.log(line);
+  }
+});
diff --git a/js/compatibility_tests/v3.0.0/commonjs/test6/test6.proto b/js/compatibility_tests/v3.0.0/commonjs/test6/test6.proto
new file mode 100644
index 00000000..a060925f
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/test6/test6.proto
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test.importing;
+
+message ImportedMessage {
+  string string_value = 1;
+}
diff --git a/js/compatibility_tests/v3.0.0/commonjs/test7/test7.proto b/js/compatibility_tests/v3.0.0/commonjs/test7/test7.proto
new file mode 100644
index 00000000..f5574a3d
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/commonjs/test7/test7.proto
@@ -0,0 +1,42 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test.framing;
+
+import "test6/test6.proto";
+
+message FramingMessage {
+  jspb.test.importing.ImportedMessage imported_message = 1;
+}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto b/js/compatibility_tests/v3.0.0/data.proto
index 958e1f17..74a8a994 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_multiple_nano.proto
+++ b/js/compatibility_tests/v3.0.0/data.proto
@@ -28,21 +28,24 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+// Author: mwr@google.com (Mark Rawling)
 
-package protobuf_unittest;
+syntax = "proto2";
 
-option java_package = "com.google.protobuf";
+option java_package = "com.google.apps.jspb.proto";
 option java_multiple_files = true;
 
-enum FileScopeEnumMultiple {
-  THREE = 3;
-}
+package jspb.test;
 
-message EnumClassNanoMultiple {
-  enum MessageScopeEnumMultiple {
-    FOUR = 4;
+// legacy data, must be nested
+message data {
+  message NestedData {
+    required string str = 1;
   }
-  optional FileScopeEnumMultiple three = 3 [ default = THREE ];
-  optional MessageScopeEnumMultiple four = 4 [ default = FOUR ];
 }
+
+// new data, does not require nesting
+message UnnestedData {
+  required string str = 1;
+}
+
diff --git a/js/compatibility_tests/v3.0.0/debug_test.js b/js/compatibility_tests/v3.0.0/debug_test.js
new file mode 100644
index 00000000..01cbf891
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/debug_test.js
@@ -0,0 +1,105 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.setTestOnly();
+
+goog.require('goog.testing.asserts');
+
+// CommonJS-LoadFromFile: google-protobuf
+goog.require('jspb.debug');
+
+// CommonJS-LoadFromFile: test_pb
+goog.require('proto.jspb.test.HasExtensions');
+goog.require('proto.jspb.test.IsExtension');
+goog.require('proto.jspb.test.Simple1');
+
+
+
+describe('debugTest', function() {
+  it('testSimple1', function() {
+    if (COMPILED) {
+      return;
+    }
+    var message = new proto.jspb.test.Simple1();
+    message.setAString('foo');
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aString': 'foo',
+      'aRepeatedStringList': []
+    }, jspb.debug.dump(message));
+
+    message.setABoolean(true);
+    message.setARepeatedStringList(['1', '2']);
+
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aString': 'foo',
+      'aRepeatedStringList': ['1', '2'],
+      'aBoolean': true
+    }, jspb.debug.dump(message));
+
+    message.setAString(undefined);
+
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aRepeatedStringList': ['1', '2'],
+      'aBoolean': true
+    }, jspb.debug.dump(message));
+  });
+
+
+  it('testExtensions', function() {
+    if (COMPILED) {
+      return;
+    }
+    var extension = new proto.jspb.test.IsExtension();
+    extension.setExt1('ext1field');
+    var extendable = new proto.jspb.test.HasExtensions();
+    extendable.setStr1('v1');
+    extendable.setStr2('v2');
+    extendable.setStr3('v3');
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension);
+
+    assertObjectEquals({
+      '$name': 'proto.jspb.test.HasExtensions',
+      'str1': 'v1',
+      'str2': 'v2',
+      'str3': 'v3',
+      '$extensions': {
+        'extField': {
+          '$name': 'proto.jspb.test.IsExtension',
+          'ext1': 'ext1field'
+        },
+        'repeatedSimpleList': []
+      }
+    }, jspb.debug.dump(extendable));
+  });
+
+});
diff --git a/js/compatibility_tests/v3.0.0/jasmine1.json b/js/compatibility_tests/v3.0.0/jasmine1.json
new file mode 100644
index 00000000..6653c01c
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/jasmine1.json
@@ -0,0 +1,17 @@
+{
+    "spec_dir": "",
+    "spec_files": [
+        "*_test.js",
+        "binary/*_test.js"
+    ],
+    "helpers": [
+        "../../../js/node_modules/google-closure-library/closure/goog/bootstrap/nodejs.js",
+        "../../../js/node_loader.js",
+        "../../../js/deps.js",
+        "../../../js/google/protobuf/any.js",
+        "../../../js/google/protobuf/struct.js",
+        "../../../js/google/protobuf/timestamp.js",
+        "testproto_libs1.js",
+        "testproto_libs2.js"
+    ]
+}
diff --git a/js/compatibility_tests/v3.0.0/jasmine2.json b/js/compatibility_tests/v3.0.0/jasmine2.json
new file mode 100644
index 00000000..3208078f
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/jasmine2.json
@@ -0,0 +1,17 @@
+{
+    "spec_dir": "",
+    "spec_files": [
+        "*_test.js",
+        "binary/*_test.js"
+    ],
+    "helpers": [
+        "../../../js/node_modules/google-closure-library/closure/goog/bootstrap/nodejs.js",
+        "../../../js/node_loader.js",
+        "../../../js/deps.js",
+        "../../../js/google/protobuf/any.js",
+        "../../../js/google/protobuf/struct.js",
+        "../../../js/google/protobuf/timestamp.js",
+        "testproto_libs1_new.js",
+        "testproto_libs2.js"
+    ]
+}
diff --git a/js/compatibility_tests/v3.0.0/jasmine3.json b/js/compatibility_tests/v3.0.0/jasmine3.json
new file mode 100644
index 00000000..3fb9a1b0
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/jasmine3.json
@@ -0,0 +1,17 @@
+{
+    "spec_dir": "",
+    "spec_files": [
+        "*_test.js",
+        "binary/*_test.js"
+    ],
+    "helpers": [
+        "../../../js/node_modules/google-closure-library/closure/goog/bootstrap/nodejs.js",
+        "../../../js/node_loader.js",
+        "../../../js/deps.js",
+        "../../../js/google/protobuf/any.js",
+        "../../../js/google/protobuf/struct.js",
+        "../../../js/google/protobuf/timestamp.js",
+        "testproto_libs1.js",
+        "testproto_libs2_new.js"
+    ]
+}
diff --git a/js/compatibility_tests/v3.0.0/message_test.js b/js/compatibility_tests/v3.0.0/message_test.js
new file mode 100644
index 00000000..b7791431
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/message_test.js
@@ -0,0 +1,1080 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Test suite is written using Jasmine -- see http://jasmine.github.io/
+
+goog.setTestOnly();
+
+goog.require('goog.json');
+goog.require('goog.testing.asserts');
+goog.require('goog.userAgent');
+
+// CommonJS-LoadFromFile: google-protobuf jspb
+goog.require('jspb.Message');
+
+// CommonJS-LoadFromFile: test5_pb proto.jspb.exttest.beta
+goog.require('proto.jspb.exttest.beta.floatingStrField');
+
+// CommonJS-LoadFromFile: test3_pb proto.jspb.exttest
+goog.require('proto.jspb.exttest.floatingMsgField');
+
+// CommonJS-LoadFromFile: test4_pb proto.jspb.exttest
+goog.require('proto.jspb.exttest.floatingMsgFieldTwo');
+
+// CommonJS-LoadFromFile: test_pb proto.jspb.test
+goog.require('proto.jspb.test.CloneExtension');
+goog.require('proto.jspb.test.Complex');
+goog.require('proto.jspb.test.DefaultValues');
+goog.require('proto.jspb.test.Empty');
+goog.require('proto.jspb.test.EnumContainer');
+goog.require('proto.jspb.test.floatingMsgField');
+goog.require('proto.jspb.test.FloatingPointFields');
+goog.require('proto.jspb.test.floatingStrField');
+goog.require('proto.jspb.test.HasExtensions');
+goog.require('proto.jspb.test.IndirectExtension');
+goog.require('proto.jspb.test.IsExtension');
+goog.require('proto.jspb.test.OptionalFields');
+goog.require('proto.jspb.test.OuterEnum');
+goog.require('proto.jspb.test.OuterMessage.Complex');
+goog.require('proto.jspb.test.Simple1');
+goog.require('proto.jspb.test.Simple2');
+goog.require('proto.jspb.test.SpecialCases');
+goog.require('proto.jspb.test.TestClone');
+goog.require('proto.jspb.test.TestEndsWithBytes');
+goog.require('proto.jspb.test.TestGroup');
+goog.require('proto.jspb.test.TestGroup1');
+goog.require('proto.jspb.test.TestMessageWithOneof');
+goog.require('proto.jspb.test.TestReservedNames');
+goog.require('proto.jspb.test.TestReservedNamesExtension');
+
+// CommonJS-LoadFromFile: test2_pb proto.jspb.test
+goog.require('proto.jspb.test.ExtensionMessage');
+goog.require('proto.jspb.test.TestExtensionsMessage');
+
+
+
+
+describe('Message test suite', function() {
+  it('testEmptyProto', function() {
+    var empty1 = new proto.jspb.test.Empty([]);
+    var empty2 = new proto.jspb.test.Empty([]);
+    assertObjectEquals({}, empty1.toObject());
+    assertObjectEquals('Message should not be corrupted:', empty2, empty1);
+  });
+
+  it('testTopLevelEnum', function() {
+    var response = new proto.jspb.test.EnumContainer([]);
+    response.setOuterEnum(proto.jspb.test.OuterEnum.FOO);
+    assertEquals(proto.jspb.test.OuterEnum.FOO, response.getOuterEnum());
+  });
+
+  it('testByteStrings', function() {
+    var data = new proto.jspb.test.DefaultValues([]);
+    data.setBytesField('some_bytes');
+    assertEquals('some_bytes', data.getBytesField());
+  });
+
+  it('testComplexConversion', function() {
+    var data1 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var data2 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var foo = new proto.jspb.test.Complex(data1);
+    var bar = new proto.jspb.test.Complex(data2);
+    var result = foo.toObject();
+    assertObjectEquals({
+      aString: 'a',
+      anOutOfOrderBool: 1,
+      aNestedMessage: {
+        anInt: 11
+      },
+      aRepeatedMessageList: [{anInt: 22}, {anInt: 33}],
+      aRepeatedStringList: ['s1', 's2']
+    }, result);
+
+    // Now test with the jspb instances included.
+    result = foo.toObject(true /* opt_includeInstance */);
+    assertObjectEquals({
+      aString: 'a',
+      anOutOfOrderBool: 1,
+      aNestedMessage: {
+        anInt: 11,
+        $jspbMessageInstance: foo.getANestedMessage()
+      },
+      aRepeatedMessageList: [
+        {anInt: 22, $jspbMessageInstance: foo.getARepeatedMessageList()[0]},
+        {anInt: 33, $jspbMessageInstance: foo.getARepeatedMessageList()[1]}
+      ],
+      aRepeatedStringList: ['s1', 's2'],
+      $jspbMessageInstance: foo
+    }, result);
+
+  });
+
+  it('testMissingFields', function() {
+    var foo = new proto.jspb.test.Complex([
+        undefined, undefined, undefined, [],
+        undefined, undefined, undefined, undefined]);
+    var bar = new proto.jspb.test.Complex([
+        undefined, undefined, undefined, [],
+        undefined, undefined, undefined, undefined]);
+    var result = foo.toObject();
+    assertObjectEquals({
+      aString: undefined,
+      anOutOfOrderBool: undefined,
+      aNestedMessage: {
+        anInt: undefined
+      },
+      // Note: JsPb converts undefined repeated fields to empty arrays.
+      aRepeatedMessageList: [],
+      aRepeatedStringList: []
+    }, result);
+
+  });
+
+  it('testNestedComplexMessage', function() {
+    // Instantiate the message and set a unique field, just to ensure that we
+    // are not getting jspb.test.Complex instead.
+    var msg = new proto.jspb.test.OuterMessage.Complex();
+    msg.setInnerComplexField(5);
+  });
+
+  it('testSpecialCases', function() {
+    // Note: Some property names are reserved in JavaScript.
+    // These names are converted to the Js property named pb_<reserved_name>.
+    var special =
+        new proto.jspb.test.SpecialCases(['normal', 'default', 'function',
+        'var']);
+    var result = special.toObject();
+    assertObjectEquals({
+      normal: 'normal',
+      pb_default: 'default',
+      pb_function: 'function',
+      pb_var: 'var'
+    }, result);
+  });
+
+  it('testDefaultValues', function() {
+    var defaultString = "default<>\'\"abc";
+    var response = new proto.jspb.test.DefaultValues();
+
+    // Test toObject
+    var expectedObject = {
+      stringField: defaultString,
+      boolField: true,
+      intField: 11,
+      enumField: 13,
+      emptyField: '',
+      bytesField: 'bW9v'
+    };
+    assertObjectEquals(expectedObject, response.toObject());
+
+
+    // Test getters
+    response = new proto.jspb.test.DefaultValues();
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertEquals('', response.getEmptyField());
+    assertEquals('bW9v', response.getBytesField());
+
+    function makeDefault(values) {
+      return new proto.jspb.test.DefaultValues(values);
+    }
+
+    // Test with undefined values,
+    // Use push to workaround IE treating undefined array elements as holes.
+    response = makeDefault([undefined, undefined, undefined, undefined]);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test with null values, as would be returned by a JSON serializer.
+    response = makeDefault([null, null, null, null]);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test with false-like values.
+    response = makeDefault(['', false, 0, 0]);
+    assertEquals('', response.getStringField());
+    assertEquals(false, response.getBoolField());
+    assertEquals(true, response.getIntField() == 0);
+    assertEquals(true, response.getEnumField() == 0);
+    assertTrue(response.hasStringField());
+    assertTrue(response.hasBoolField());
+    assertTrue(response.hasIntField());
+    assertTrue(response.hasEnumField());
+
+    // Test that clearing the values reverts them to the default state.
+    response = makeDefault(['blah', false, 111, 77]);
+    response.clearStringField(); response.clearBoolField();
+    response.clearIntField(); response.clearEnumField();
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test that setFoo(null) clears the values.
+    response = makeDefault(['blah', false, 111, 77]);
+    response.setStringField(null); response.setBoolField(null);
+    response.setIntField(undefined); response.setEnumField(undefined);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+  });
+
+  it('testMessageRegistration', function() {
+    // goog.require(SomeResponse) will include its library, which will in
+    // turn add SomeResponse to the message registry.
+    assertEquals(jspb.Message.registry_['res'], proto.jspb.test.SomeResponse);
+  });
+
+  it('testClearFields', function() {
+    var data = ['str', true, [11], [[22], [33]], ['s1', 's2']];
+    var foo = new proto.jspb.test.OptionalFields(data);
+    foo.clearAString();
+    foo.clearABool();
+    foo.clearANestedMessage();
+    foo.clearARepeatedMessageList();
+    foo.clearARepeatedStringList();
+    assertEquals('', foo.getAString());
+    assertEquals(false, foo.getABool());
+    assertUndefined(foo.getANestedMessage());
+    assertFalse(foo.hasAString());
+    assertFalse(foo.hasABool());
+    assertObjectEquals([], foo.getARepeatedMessageList());
+    assertObjectEquals([], foo.getARepeatedStringList());
+    // NOTE: We want the missing fields in 'expected' to be undefined,
+    // but we actually get a sparse array instead. We could use something
+    // like [1,undefined,2] to avoid this, except that this is still
+    // sparse on IE. No comment...
+    var expected = [,,, [], []];
+    expected[0] = expected[1] = expected[2] = undefined;
+    assertObjectEquals(expected, foo.toArray());
+
+    // Test set(null). We could deprecated this in favor of clear(), but
+    // it's also convenient to have.
+    data = ['str', true, [11], [[22], [33]], ['s1', 's2']];
+    foo = new proto.jspb.test.OptionalFields(data);
+    foo.setAString(null);
+    foo.setABool(null);
+    foo.setANestedMessage(null);
+    foo.setARepeatedMessageList(null);
+    foo.setARepeatedStringList(null);
+    assertEquals('', foo.getAString());
+    assertEquals(false, foo.getABool());
+    assertNull(foo.getANestedMessage());
+    assertFalse(foo.hasAString());
+    assertFalse(foo.hasABool());
+    assertObjectEquals([], foo.getARepeatedMessageList());
+    assertObjectEquals([], foo.getARepeatedStringList());
+    assertObjectEquals([null, null, null, [], []], foo.toArray());
+
+    // Test set(undefined). Again, not something we really need, and not
+    // supported directly by our typing, but it should 'do the right thing'.
+    data = ['str', true, [11], [[22], [33]], ['s1', 's2']];
+    foo = new proto.jspb.test.OptionalFields(data);
+    foo.setAString(undefined);
+    foo.setABool(undefined);
+    foo.setANestedMessage(undefined);
+    foo.setARepeatedMessageList(undefined);
+    foo.setARepeatedStringList(undefined);
+    assertEquals('', foo.getAString());
+    assertEquals(false, foo.getABool());
+    assertUndefined(foo.getANestedMessage());
+    assertFalse(foo.hasAString());
+    assertFalse(foo.hasABool());
+    assertObjectEquals([], foo.getARepeatedMessageList());
+    assertObjectEquals([], foo.getARepeatedStringList());
+    expected = [,,, [], []];
+    expected[0] = expected[1] = expected[2] = undefined;
+    assertObjectEquals(expected, foo.toArray());
+  });
+
+  it('testDifferenceRawObject', function() {
+    var p1 = new proto.jspb.test.HasExtensions(['hi', 'diff', {}]);
+    var p2 = new proto.jspb.test.HasExtensions(['hi', 'what',
+                                               {1000: 'unique'}]);
+    var diff = /** @type {proto.jspb.test.HasExtensions} */
+        (jspb.Message.difference(p1, p2));
+    assertEquals('', diff.getStr1());
+    assertEquals('what', diff.getStr2());
+    assertEquals('', diff.getStr3());
+    assertEquals('unique', diff.extensionObject_[1000]);
+  });
+
+  it('testEqualsSimple', function() {
+    var s1 = new proto.jspb.test.Simple1(['hi']);
+    assertTrue(jspb.Message.equals(s1, new proto.jspb.test.Simple1(['hi'])));
+    assertFalse(jspb.Message.equals(s1, new proto.jspb.test.Simple1(['bye'])));
+    var s1b = new proto.jspb.test.Simple1(['hi', ['hello']]);
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', ['hello']])));
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', ['hello', undefined,
+                                            undefined, undefined]])));
+    assertFalse(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['no', ['hello']])));
+    // Test with messages of different types
+    var s2 = new proto.jspb.test.Simple2(['hi']);
+    assertFalse(jspb.Message.equals(s1, s2));
+  });
+
+  it('testEquals_softComparison', function() {
+    var s1 = new proto.jspb.test.Simple1(['hi', [], null]);
+    assertTrue(jspb.Message.equals(s1,
+        new proto.jspb.test.Simple1(['hi', []])));
+
+    var s1b = new proto.jspb.test.Simple1(['hi', [], true]);
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', [], 1])));
+  });
+
+  it('testEqualsComplex', function() {
+    var data1 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var data2 = ['a',,, [, 11], [[, 22], [, 34]],, ['s1', 's2'],, 1];
+    var data3 = ['a',,, [, 11], [[, 22]],, ['s1', 's2'],, 1];
+    var data4 = ['hi'];
+    var c1a = new proto.jspb.test.Complex(data1);
+    var c1b = new proto.jspb.test.Complex(data1);
+    var c2 = new proto.jspb.test.Complex(data2);
+    var c3 = new proto.jspb.test.Complex(data3);
+    var s1 = new proto.jspb.test.Simple1(data4);
+
+    assertTrue(jspb.Message.equals(c1a, c1b));
+    assertFalse(jspb.Message.equals(c1a, c2));
+    assertFalse(jspb.Message.equals(c2, c3));
+    assertFalse(jspb.Message.equals(c1a, s1));
+  });
+
+  it('testEqualsExtensionsConstructed', function() {
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([]),
+        new proto.jspb.test.HasExtensions([{}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}])
+    ));
+    assertFalse(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'b'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([,,, {100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([,,, {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi',,, {100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi',,, {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}])
+    ));
+  });
+
+  it('testEqualsExtensionsUnconstructed', function() {
+    assertTrue(jspb.Message.compareFields([], [{}]));
+    assertTrue(jspb.Message.compareFields([,,, {}], []));
+    assertTrue(jspb.Message.compareFields([,,, {}], [,, {}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi', {100: [{200: 'a'}]}]));
+    assertFalse(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi', {100: [{200: 'b'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [{100: [{200: 'a'}]}], [{100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [{100: [{200: 'a'}]}], [,,, {100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [,,, {100: [{200: 'a'}]}], [{100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi',,, {100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi',,, {100: [{200: 'a'}]}], ['hi', {100: [{200: 'a'}]}]));
+  });
+
+  it('testToMap', function() {
+    var p1 = new proto.jspb.test.Simple1(['k', ['v']]);
+    var p2 = new proto.jspb.test.Simple1(['k1', ['v1', 'v2']]);
+    var soymap = jspb.Message.toMap([p1, p2],
+        proto.jspb.test.Simple1.prototype.getAString,
+        proto.jspb.test.Simple1.prototype.toObject);
+    assertEquals('k', soymap['k'].aString);
+    assertArrayEquals(['v'], soymap['k'].aRepeatedStringList);
+    var protomap = jspb.Message.toMap([p1, p2],
+        proto.jspb.test.Simple1.prototype.getAString);
+    assertEquals('k', protomap['k'].getAString());
+    assertArrayEquals(['v'], protomap['k'].getARepeatedStringList());
+  });
+
+  it('testClone', function() {
+    var supportsUint8Array =
+        !goog.userAgent.IE || goog.userAgent.isVersionOrHigher('10');
+    var original = new proto.jspb.test.TestClone();
+    original.setStr('v1');
+    var simple1 = new proto.jspb.test.Simple1(['x1', ['y1', 'z1']]);
+    var simple2 = new proto.jspb.test.Simple1(['x2', ['y2', 'z2']]);
+    var simple3 = new proto.jspb.test.Simple1(['x3', ['y3', 'z3']]);
+    original.setSimple1(simple1);
+    original.setSimple2List([simple2, simple3]);
+    var bytes1 = supportsUint8Array ? new Uint8Array([1, 2, 3]) : '123';
+    original.setBytesField(bytes1);
+    var extension = new proto.jspb.test.CloneExtension();
+    extension.setExt('e1');
+    original.setExtension(proto.jspb.test.IsExtension.extField, extension);
+    var clone = original.cloneMessage();
+    assertArrayEquals(['v1',, ['x1', ['y1', 'z1']],,
+      [['x2', ['y2', 'z2']], ['x3', ['y3', 'z3']]], bytes1,, { 100: [, 'e1'] }],
+        clone.toArray());
+    clone.setStr('v2');
+    var simple4 = new proto.jspb.test.Simple1(['a1', ['b1', 'c1']]);
+    var simple5 = new proto.jspb.test.Simple1(['a2', ['b2', 'c2']]);
+    var simple6 = new proto.jspb.test.Simple1(['a3', ['b3', 'c3']]);
+    clone.setSimple1(simple4);
+    clone.setSimple2List([simple5, simple6]);
+    if (supportsUint8Array) {
+      clone.getBytesField()[0] = 4;
+      assertObjectEquals(bytes1, original.getBytesField());
+    }
+    var bytes2 = supportsUint8Array ? new Uint8Array([4, 5, 6]) : '456';
+    clone.setBytesField(bytes2);
+    var newExtension = new proto.jspb.test.CloneExtension();
+    newExtension.setExt('e2');
+    clone.setExtension(proto.jspb.test.CloneExtension.extField, newExtension);
+    assertArrayEquals(['v2',, ['a1', ['b1', 'c1']],,
+      [['a2', ['b2', 'c2']], ['a3', ['b3', 'c3']]], bytes2,, { 100: [, 'e2'] }],
+        clone.toArray());
+    assertArrayEquals(['v1',, ['x1', ['y1', 'z1']],,
+      [['x2', ['y2', 'z2']], ['x3', ['y3', 'z3']]], bytes1,, { 100: [, 'e1'] }],
+        original.toArray());
+  });
+
+  it('testCopyInto', function() {
+    var supportsUint8Array =
+        !goog.userAgent.IE || goog.userAgent.isVersionOrHigher('10');
+    var original = new proto.jspb.test.TestClone();
+    original.setStr('v1');
+    var dest = new proto.jspb.test.TestClone();
+    dest.setStr('override');
+    var simple1 = new proto.jspb.test.Simple1(['x1', ['y1', 'z1']]);
+    var simple2 = new proto.jspb.test.Simple1(['x2', ['y2', 'z2']]);
+    var simple3 = new proto.jspb.test.Simple1(['x3', ['y3', 'z3']]);
+    var destSimple1 = new proto.jspb.test.Simple1(['ox1', ['oy1', 'oz1']]);
+    var destSimple2 = new proto.jspb.test.Simple1(['ox2', ['oy2', 'oz2']]);
+    var destSimple3 = new proto.jspb.test.Simple1(['ox3', ['oy3', 'oz3']]);
+    original.setSimple1(simple1);
+    original.setSimple2List([simple2, simple3]);
+    dest.setSimple1(destSimple1);
+    dest.setSimple2List([destSimple2, destSimple3]);
+    var bytes1 = supportsUint8Array ? new Uint8Array([1, 2, 3]) : '123';
+    var bytes2 = supportsUint8Array ? new Uint8Array([4, 5, 6]) : '456';
+    original.setBytesField(bytes1);
+    dest.setBytesField(bytes2);
+    var extension = new proto.jspb.test.CloneExtension();
+    extension.setExt('e1');
+    original.setExtension(proto.jspb.test.CloneExtension.extField, extension);
+
+    jspb.Message.copyInto(original, dest);
+    assertArrayEquals(original.toArray(), dest.toArray());
+    assertEquals('x1', dest.getSimple1().getAString());
+    assertEquals('e1',
+        dest.getExtension(proto.jspb.test.CloneExtension.extField).getExt());
+    dest.getSimple1().setAString('new value');
+    assertNotEquals(dest.getSimple1().getAString(),
+        original.getSimple1().getAString());
+    if (supportsUint8Array) {
+      dest.getBytesField()[0] = 7;
+      assertObjectEquals(bytes1, original.getBytesField());
+      assertObjectEquals(new Uint8Array([7, 2, 3]), dest.getBytesField());
+    } else {
+      dest.setBytesField('789');
+      assertObjectEquals(bytes1, original.getBytesField());
+      assertObjectEquals('789', dest.getBytesField());
+    }
+    dest.getExtension(proto.jspb.test.CloneExtension.extField).
+        setExt('new value');
+    assertNotEquals(
+        dest.getExtension(proto.jspb.test.CloneExtension.extField).getExt(),
+        original.getExtension(
+            proto.jspb.test.CloneExtension.extField).getExt());
+  });
+
+  it('testCopyInto_notSameType', function() {
+    var a = new proto.jspb.test.TestClone();
+    var b = new proto.jspb.test.Simple1(['str', ['s1', 's2']]);
+
+    var e = assertThrows(function() {
+      jspb.Message.copyInto(a, b);
+    });
+    assertContains('should have the same type', e.message);
+  });
+
+  it('testExtensions', function() {
+    var extension1 = new proto.jspb.test.IsExtension(['ext1field']);
+    var extension2 = new proto.jspb.test.Simple1(['str', ['s1', 's2']]);
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension1);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple,
+                            extension2);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, 'xyzzy');
+    extendable.setExtension(proto.jspb.test.IndirectExtension.repeatedStrList,
+        ['a', 'b']);
+    var s1 = new proto.jspb.test.Simple1(['foo', ['s1', 's2']]);
+    var s2 = new proto.jspb.test.Simple1(['bar', ['t1', 't2']]);
+    extendable.setExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList,
+        [s1, s2]);
+    assertObjectEquals(extension1,
+        extendable.getExtension(proto.jspb.test.IsExtension.extField));
+    assertObjectEquals(extension2,
+        extendable.getExtension(proto.jspb.test.IndirectExtension.simple));
+    assertObjectEquals('xyzzy',
+        extendable.getExtension(proto.jspb.test.IndirectExtension.str));
+    assertObjectEquals(['a', 'b'], extendable.getExtension(
+        proto.jspb.test.IndirectExtension.repeatedStrList));
+    assertObjectEquals([s1, s2], extendable.getExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList));
+    // Not supported yet, but it should work...
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple, null);
+    assertNull(
+        extendable.getExtension(proto.jspb.test.IndirectExtension.simple));
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, null);
+    assertNull(extendable.getExtension(proto.jspb.test.IndirectExtension.str));
+
+
+    // Extension fields with jspb.ignore = true are ignored.
+    assertUndefined(proto.jspb.test.IndirectExtension['ignored']);
+    assertUndefined(proto.jspb.test.HasExtensions['ignoredFloating']);
+  });
+
+  it('testFloatingExtensions', function() {
+    // From an autogenerated container.
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    var extension = new proto.jspb.test.Simple1(['foo', ['s1', 's2']]);
+    extendable.setExtension(proto.jspb.test.simple1, extension);
+    assertObjectEquals(extension,
+        extendable.getExtension(proto.jspb.test.simple1));
+
+    // From _lib mode.
+    extension = new proto.jspb.test.ExtensionMessage(['s1']);
+    extendable = new proto.jspb.test.TestExtensionsMessage([16]);
+    extendable.setExtension(proto.jspb.test.floatingMsgField, extension);
+    extendable.setExtension(proto.jspb.test.floatingStrField, 's2');
+    assertObjectEquals(extension,
+        extendable.getExtension(proto.jspb.test.floatingMsgField));
+    assertObjectEquals('s2',
+        extendable.getExtension(proto.jspb.test.floatingStrField));
+    assertNotUndefined(proto.jspb.exttest.floatingMsgField);
+    assertNotUndefined(proto.jspb.exttest.floatingMsgFieldTwo);
+    assertNotUndefined(proto.jspb.exttest.beta.floatingStrField);
+  });
+
+  it('testToObject_extendedObject', function() {
+    var extension1 = new proto.jspb.test.IsExtension(['ext1field']);
+    var extension2 = new proto.jspb.test.Simple1(['str', ['s1', 's2'], true]);
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension1);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple,
+                            extension2);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, 'xyzzy');
+    extendable.setExtension(proto.jspb.test.IndirectExtension.repeatedStrList,
+        ['a', 'b']);
+    var s1 = new proto.jspb.test.Simple1(['foo', ['s1', 's2'], true]);
+    var s2 = new proto.jspb.test.Simple1(['bar', ['t1', 't2'], false]);
+    extendable.setExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList,
+        [s1, s2]);
+    assertObjectEquals({
+      str1: 'v1', str2: 'v2', str3: 'v3',
+      extField: { ext1: 'ext1field' },
+      simple: {
+        aString: 'str', aRepeatedStringList: ['s1', 's2'], aBoolean: true
+      },
+      str: 'xyzzy',
+      repeatedStrList: ['a', 'b'],
+      repeatedSimpleList: [
+        { aString: 'foo', aRepeatedStringList: ['s1', 's2'], aBoolean: true},
+        { aString: 'bar', aRepeatedStringList: ['t1', 't2'], aBoolean: false}
+      ]
+    }, extendable.toObject());
+
+    // Now, with instances included.
+    assertObjectEquals({
+      str1: 'v1', str2: 'v2', str3: 'v3',
+      extField: {
+        ext1: 'ext1field',
+        $jspbMessageInstance:
+            extendable.getExtension(proto.jspb.test.IsExtension.extField)
+      },
+      simple: {
+        aString: 'str',
+        aRepeatedStringList: ['s1', 's2'],
+        aBoolean: true,
+        $jspbMessageInstance:
+            extendable.getExtension(proto.jspb.test.IndirectExtension.simple)
+      },
+      str: 'xyzzy',
+      repeatedStrList: ['a', 'b'],
+      repeatedSimpleList: [{
+        aString: 'foo',
+        aRepeatedStringList: ['s1', 's2'],
+        aBoolean: true,
+        $jspbMessageInstance: s1
+      }, {
+        aString: 'bar',
+        aRepeatedStringList: ['t1', 't2'],
+        aBoolean: false,
+        $jspbMessageInstance: s2
+      }],
+      $jspbMessageInstance: extendable
+    }, extendable.toObject(true /* opt_includeInstance */));
+  });
+
+  it('testInitialization_emptyArray', function() {
+    var msg = new proto.jspb.test.HasExtensions([]);
+    if (jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS) {
+      assertArrayEquals([], msg.toArray());
+    } else {
+      // Extension object is created past all regular fields.
+      assertArrayEquals([,,, {}], msg.toArray());
+    }
+  });
+
+  it('testInitialization_justExtensionObject', function() {
+    var msg = new proto.jspb.test.Empty([{1: 'hi'}]);
+    // The extensionObject is not moved from its original location.
+    assertArrayEquals([{1: 'hi'}], msg.toArray());
+  });
+
+  it('testInitialization_incompleteList', function() {
+    var msg = new proto.jspb.test.Empty([1, {4: 'hi'}]);
+    // The extensionObject is not moved from its original location.
+    assertArrayEquals([1, {4: 'hi'}], msg.toArray());
+  });
+
+  it('testInitialization_forwardCompatible', function() {
+    var msg = new proto.jspb.test.Empty([1, 2, 3, {1: 'hi'}]);
+    assertArrayEquals([1, 2, 3, {1: 'hi'}], msg.toArray());
+  });
+
+  it('testExtendedMessageEnsureObject', function() {
+    var data = new proto.jspb.test.HasExtensions(['str1',
+        {'a_key': 'an_object'}]);
+    assertEquals('an_object', data.extensionObject_['a_key']);
+  });
+
+  it('testToObject_hasExtensionField', function() {
+    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1']}]);
+    var obj = data.toObject();
+    assertEquals('str1', obj.str1);
+    assertEquals('ext1', obj.extField.ext1);
+  });
+
+  it('testGetExtension', function() {
+    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1']}]);
+    assertEquals('str1', data.getStr1());
+    var extension = data.getExtension(proto.jspb.test.IsExtension.extField);
+    assertNotNull(extension);
+    assertEquals('ext1', extension.getExt1());
+  });
+
+  it('testSetExtension', function() {
+    var data = new proto.jspb.test.HasExtensions();
+    var extensionMessage = new proto.jspb.test.IsExtension(['is_extension']);
+    data.setExtension(proto.jspb.test.IsExtension.extField, extensionMessage);
+    var obj = data.toObject();
+    assertNotNull(
+        data.getExtension(proto.jspb.test.IsExtension.extField));
+    assertEquals('is_extension', obj.extField.ext1);
+  });
+
+  /**
+   * Note that group is long deprecated, we only support it because JsPb has
+   * a goal of being able to generate JS classes for all proto descriptors.
+   */
+  it('testGroups', function() {
+    var group = new proto.jspb.test.TestGroup();
+    var someGroup = new proto.jspb.test.TestGroup.RepeatedGroup();
+    someGroup.setId('g1');
+    someGroup.setSomeBoolList([true, false]);
+    group.setRepeatedGroupList([someGroup]);
+    var groups = group.getRepeatedGroupList();
+    assertEquals('g1', groups[0].getId());
+    assertObjectEquals([true, false], groups[0].getSomeBoolList());
+    assertObjectEquals({id: 'g1', someBoolList: [true, false]},
+        groups[0].toObject());
+    assertObjectEquals({
+      repeatedGroupList: [{id: 'g1', someBoolList: [true, false]}],
+      requiredGroup: {id: undefined},
+      optionalGroup: undefined,
+      requiredSimple: {aRepeatedStringList: [], aString: undefined},
+      optionalSimple: undefined,
+      id: undefined
+    }, group.toObject());
+    var group1 = new proto.jspb.test.TestGroup1();
+    group1.setGroup(someGroup);
+    assertEquals(someGroup, group1.getGroup());
+  });
+
+  it('testNonExtensionFieldsAfterExtensionRange', function() {
+    var data = [{'1': 'a_string'}];
+    var message = new proto.jspb.test.Complex(data);
+    assertArrayEquals([], message.getARepeatedStringList());
+  });
+
+  it('testReservedGetterNames', function() {
+    var message = new proto.jspb.test.TestReservedNames();
+    message.setExtension$(11);
+    message.setExtension(proto.jspb.test.TestReservedNamesExtension.foo, 12);
+    assertEquals(11, message.getExtension$());
+    assertEquals(12, message.getExtension(
+        proto.jspb.test.TestReservedNamesExtension.foo));
+    assertObjectEquals({extension: 11, foo: 12}, message.toObject());
+  });
+
+  it('testInitializeMessageWithUnsetOneof', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([]);
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.
+            RECURSIVE_ONEOF_NOT_SET,
+        message.getRecursiveOneofCase());
+  });
+
+  it('testInitializeMessageWithSingleValueSetInOneof', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([,, 'x']);
+
+    assertEquals('x', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+  });
+
+  it('testKeepsLastWireValueSetInUnion_multipleValues', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([,, 'x',, 'y']);
+
+    assertEquals('', message.getPone());
+    assertEquals('y', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PTHREE,
+        message.getPartialOneofCase());
+  });
+
+  it('testSettingOneofFieldClearsOthers', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals('', message.getPone());
+    assertEquals('', message.getPthree());
+    assertFalse(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPone('hi');
+    assertEquals('hi', message.getPone());
+    assertEquals('', message.getPthree());
+    assertTrue(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPthree('bye');
+    assertEquals('', message.getPone());
+    assertEquals('bye', message.getPthree());
+    assertFalse(message.hasPone());
+    assertTrue(message.hasPthree());
+  });
+
+  it('testSettingOneofFieldDoesNotClearFieldsFromOtherUnions', function() {
+    var other = new proto.jspb.test.TestMessageWithOneof;
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals('', message.getPone());
+    assertEquals('', message.getPthree());
+    assertUndefined(message.getRone());
+    assertFalse(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPone('hi');
+    message.setRone(other);
+    assertEquals('hi', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(other, message.getRone());
+    assertTrue(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPthree('bye');
+    assertEquals('', message.getPone());
+    assertEquals('bye', message.getPthree());
+    assertEquals(other, message.getRone());
+    assertFalse(message.hasPone());
+    assertTrue(message.hasPthree());
+  });
+
+  it('testUnsetsOneofCaseWhenFieldIsCleared', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+
+    message.setPone('hi');
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+
+    message.clearPone();
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+  });
+
+  it('testMessageWithDefaultOneofValues', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(1234, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase
+            .DEFAULT_ONEOF_A_NOT_SET,
+        message.getDefaultOneofACase());
+
+    message.setAone(567);
+    assertEquals(567, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.AONE,
+        message.getDefaultOneofACase());
+
+    message.setAtwo(890);
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+
+    message.clearAtwo();
+    assertEquals(1234, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase
+            .DEFAULT_ONEOF_A_NOT_SET,
+        message.getDefaultOneofACase());
+  });
+
+  it('testMessageWithDefaultOneofValues_defaultNotOnFirstField', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(0, message.getBone());
+    assertEquals(1234, message.getBtwo());
+    assertFalse(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase
+            .DEFAULT_ONEOF_B_NOT_SET,
+        message.getDefaultOneofBCase());
+
+    message.setBone(2);
+    assertEquals(2, message.getBone());
+    assertEquals(1234, message.getBtwo());
+    assertTrue(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BONE,
+        message.getDefaultOneofBCase());
+
+    message.setBtwo(3);
+    assertEquals(0, message.getBone());
+    assertFalse(message.hasBone());
+    assertTrue(message.hasBtwo());
+    assertEquals(3, message.getBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+        message.getDefaultOneofBCase());
+
+    message.clearBtwo();
+    assertEquals(0, message.getBone());
+    assertFalse(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(1234, message.getBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase
+            .DEFAULT_ONEOF_B_NOT_SET,
+        message.getDefaultOneofBCase());
+  });
+
+  it('testInitializeMessageWithOneofDefaults', function() {
+    var message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(9).concat(567));
+    assertEquals(567, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.AONE,
+        message.getDefaultOneofACase());
+
+    message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(10).concat(890));
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+
+    message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(9).concat(567, 890));
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+  });
+
+  it('testInitializeMessageWithOneofDefaults_defaultNotSetOnFirstField',
+      function() {
+        var message;
+
+        message =
+            new proto.jspb.test.TestMessageWithOneof(new Array(11).concat(567));
+        assertEquals(567, message.getBone());
+        assertEquals(1234, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BONE,
+            message.getDefaultOneofBCase());
+
+        message =
+            new proto.jspb.test.TestMessageWithOneof(new Array(12).concat(890));
+        assertEquals(0, message.getBone());
+        assertEquals(890, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+            message.getDefaultOneofBCase());
+
+        message = new proto.jspb.test.TestMessageWithOneof(
+            new Array(11).concat(567, 890));
+        assertEquals(0, message.getBone());
+        assertEquals(890, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+            message.getDefaultOneofBCase());
+      });
+
+  it('testOneofContainingAnotherMessage', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.
+            RECURSIVE_ONEOF_NOT_SET,
+        message.getRecursiveOneofCase());
+
+    var other = new proto.jspb.test.TestMessageWithOneof;
+    message.setRone(other);
+    assertEquals(other, message.getRone());
+    assertEquals('', message.getRtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.RONE,
+        message.getRecursiveOneofCase());
+
+    message.setRtwo('hi');
+    assertUndefined(message.getRone());
+    assertEquals('hi', message.getRtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.RTWO,
+        message.getRecursiveOneofCase());
+  });
+
+  it('testQueryingOneofCaseEnsuresOnlyOneFieldIsSetInUnderlyingArray',
+     function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    message.setPone('x');
+    assertEquals('x', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+
+    var array = message.toArray();
+    assertEquals('x', array[2]);
+    assertUndefined(array[4]);
+    array[4] = 'y';
+
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PTHREE,
+        message.getPartialOneofCase());
+    assertUndefined(array[2]);
+    assertEquals('y', array[4]);
+  });
+
+  it('testFloatingPointFieldsSupportNan', function() {
+    var assertNan = function(x) {
+      assertTrue('Expected ' + x + ' (' + goog.typeOf(x) + ') to be NaN.',
+          goog.isNumber(x) && isNaN(x));
+    };
+
+    var message = new proto.jspb.test.FloatingPointFields([
+      'NaN', 'NaN', ['NaN', 'NaN'], 'NaN',
+      'NaN', 'NaN', ['NaN', 'NaN'], 'NaN'
+    ]);
+    assertNan(message.getOptionalFloatField());
+    assertNan(message.getRequiredFloatField());
+    assertNan(message.getRepeatedFloatFieldList()[0]);
+    assertNan(message.getRepeatedFloatFieldList()[1]);
+    assertNan(message.getDefaultFloatField());
+    assertNan(message.getOptionalDoubleField());
+    assertNan(message.getRequiredDoubleField());
+    assertNan(message.getRepeatedDoubleFieldList()[0]);
+    assertNan(message.getRepeatedDoubleFieldList()[1]);
+    assertNan(message.getDefaultDoubleField());
+  });
+
+});
diff --git a/js/compatibility_tests/v3.0.0/proto3_test.js b/js/compatibility_tests/v3.0.0/proto3_test.js
new file mode 100644
index 00000000..fab0fd44
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/proto3_test.js
@@ -0,0 +1,329 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+
+// CommonJS-LoadFromFile: testbinary_pb proto.jspb.test
+goog.require('proto.jspb.test.ForeignMessage');
+
+// CommonJS-LoadFromFile: proto3_test_pb proto.jspb.test
+goog.require('proto.jspb.test.Proto3Enum');
+goog.require('proto.jspb.test.TestProto3');
+
+
+var BYTES = new Uint8Array([1, 2, 8, 9]);
+var BYTES_B64 = goog.crypt.base64.encodeByteArray(BYTES);
+
+
+/**
+ * Helper: compare a bytes field to an expected value
+ * @param {Uint8Array|string} arr
+ * @param {Uint8Array} expected
+ * @return {boolean}
+ */
+function bytesCompare(arr, expected) {
+  if (goog.isString(arr)) {
+    arr = goog.crypt.base64.decodeStringToUint8Array(arr);
+  }
+  if (arr.length != expected.length) {
+    return false;
+  }
+  for (var i = 0; i < arr.length; i++) {
+    if (arr[i] != expected[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+
+describe('proto3Test', function() {
+  /**
+   * Test defaults for proto3 message fields.
+   */
+  it('testProto3FieldDefaults', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    assertEquals(msg.getOptionalInt32(), 0);
+    assertEquals(msg.getOptionalInt64(), 0);
+    assertEquals(msg.getOptionalUint32(), 0);
+    assertEquals(msg.getOptionalUint64(), 0);
+    assertEquals(msg.getOptionalSint32(), 0);
+    assertEquals(msg.getOptionalSint64(), 0);
+    assertEquals(msg.getOptionalFixed32(), 0);
+    assertEquals(msg.getOptionalFixed64(), 0);
+    assertEquals(msg.getOptionalSfixed32(), 0);
+    assertEquals(msg.getOptionalSfixed64(), 0);
+    assertEquals(msg.getOptionalFloat(), 0);
+    assertEquals(msg.getOptionalDouble(), 0);
+    assertEquals(msg.getOptionalString(), '');
+
+    // TODO(b/26173701): when we change bytes fields default getter to return
+    // Uint8Array, we'll want to switch this assertion to match the u8 case.
+    assertEquals(typeof msg.getOptionalBytes(), 'string');
+    assertEquals(msg.getOptionalBytes_asU8() instanceof Uint8Array, true);
+    assertEquals(typeof msg.getOptionalBytes_asB64(), 'string');
+    assertEquals(msg.getOptionalBytes().length, 0);
+    assertEquals(msg.getOptionalBytes_asU8().length, 0);
+    assertEquals(msg.getOptionalBytes_asB64(), '');
+
+    assertEquals(msg.getOptionalForeignEnum(),
+                 proto.jspb.test.Proto3Enum.PROTO3_FOO);
+    assertEquals(msg.getOptionalForeignMessage(), undefined);
+    assertEquals(msg.getOptionalForeignMessage(), undefined);
+
+    assertEquals(msg.getRepeatedInt32List().length, 0);
+    assertEquals(msg.getRepeatedInt64List().length, 0);
+    assertEquals(msg.getRepeatedUint32List().length, 0);
+    assertEquals(msg.getRepeatedUint64List().length, 0);
+    assertEquals(msg.getRepeatedSint32List().length, 0);
+    assertEquals(msg.getRepeatedSint64List().length, 0);
+    assertEquals(msg.getRepeatedFixed32List().length, 0);
+    assertEquals(msg.getRepeatedFixed64List().length, 0);
+    assertEquals(msg.getRepeatedSfixed32List().length, 0);
+    assertEquals(msg.getRepeatedSfixed64List().length, 0);
+    assertEquals(msg.getRepeatedFloatList().length, 0);
+    assertEquals(msg.getRepeatedDoubleList().length, 0);
+    assertEquals(msg.getRepeatedStringList().length, 0);
+    assertEquals(msg.getRepeatedBytesList().length, 0);
+    assertEquals(msg.getRepeatedForeignEnumList().length, 0);
+    assertEquals(msg.getRepeatedForeignMessageList().length, 0);
+
+  });
+
+
+  /**
+   * Test that all fields can be set and read via a serialization roundtrip.
+   */
+  it('testProto3FieldSetGet', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    msg.setOptionalInt32(-42);
+    msg.setOptionalInt64(-0x7fffffff00000000);
+    msg.setOptionalUint32(0x80000000);
+    msg.setOptionalUint64(0xf000000000000000);
+    msg.setOptionalSint32(-100);
+    msg.setOptionalSint64(-0x8000000000000000);
+    msg.setOptionalFixed32(1234);
+    msg.setOptionalFixed64(0x1234567800000000);
+    msg.setOptionalSfixed32(-1234);
+    msg.setOptionalSfixed64(-0x1234567800000000);
+    msg.setOptionalFloat(1.5);
+    msg.setOptionalDouble(-1.5);
+    msg.setOptionalBool(true);
+    msg.setOptionalString('hello world');
+    msg.setOptionalBytes(BYTES);
+    var submsg = new proto.jspb.test.ForeignMessage();
+    submsg.setC(16);
+    msg.setOptionalForeignMessage(submsg);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_BAR);
+
+    msg.setRepeatedInt32List([-42]);
+    msg.setRepeatedInt64List([-0x7fffffff00000000]);
+    msg.setRepeatedUint32List([0x80000000]);
+    msg.setRepeatedUint64List([0xf000000000000000]);
+    msg.setRepeatedSint32List([-100]);
+    msg.setRepeatedSint64List([-0x8000000000000000]);
+    msg.setRepeatedFixed32List([1234]);
+    msg.setRepeatedFixed64List([0x1234567800000000]);
+    msg.setRepeatedSfixed32List([-1234]);
+    msg.setRepeatedSfixed64List([-0x1234567800000000]);
+    msg.setRepeatedFloatList([1.5]);
+    msg.setRepeatedDoubleList([-1.5]);
+    msg.setRepeatedBoolList([true]);
+    msg.setRepeatedStringList(['hello world']);
+    msg.setRepeatedBytesList([BYTES]);
+    submsg = new proto.jspb.test.ForeignMessage();
+    submsg.setC(1000);
+    msg.setRepeatedForeignMessageList([submsg]);
+    msg.setRepeatedForeignEnumList([proto.jspb.test.Proto3Enum.PROTO3_BAR]);
+
+    msg.setOneofString('asdf');
+
+    var serialized = msg.serializeBinary();
+    msg = proto.jspb.test.TestProto3.deserializeBinary(serialized);
+
+    assertEquals(msg.getOptionalInt32(), -42);
+    assertEquals(msg.getOptionalInt64(), -0x7fffffff00000000);
+    assertEquals(msg.getOptionalUint32(), 0x80000000);
+    assertEquals(msg.getOptionalUint64(), 0xf000000000000000);
+    assertEquals(msg.getOptionalSint32(), -100);
+    assertEquals(msg.getOptionalSint64(), -0x8000000000000000);
+    assertEquals(msg.getOptionalFixed32(), 1234);
+    assertEquals(msg.getOptionalFixed64(), 0x1234567800000000);
+    assertEquals(msg.getOptionalSfixed32(), -1234);
+    assertEquals(msg.getOptionalSfixed64(), -0x1234567800000000);
+    assertEquals(msg.getOptionalFloat(), 1.5);
+    assertEquals(msg.getOptionalDouble(), -1.5);
+    assertEquals(msg.getOptionalBool(), true);
+    assertEquals(msg.getOptionalString(), 'hello world');
+    assertEquals(true, bytesCompare(msg.getOptionalBytes(), BYTES));
+    assertEquals(msg.getOptionalForeignMessage().getC(), 16);
+    assertEquals(msg.getOptionalForeignEnum(),
+        proto.jspb.test.Proto3Enum.PROTO3_BAR);
+
+    assertElementsEquals(msg.getRepeatedInt32List(), [-42]);
+    assertElementsEquals(msg.getRepeatedInt64List(), [-0x7fffffff00000000]);
+    assertElementsEquals(msg.getRepeatedUint32List(), [0x80000000]);
+    assertElementsEquals(msg.getRepeatedUint64List(), [0xf000000000000000]);
+    assertElementsEquals(msg.getRepeatedSint32List(), [-100]);
+    assertElementsEquals(msg.getRepeatedSint64List(), [-0x8000000000000000]);
+    assertElementsEquals(msg.getRepeatedFixed32List(), [1234]);
+    assertElementsEquals(msg.getRepeatedFixed64List(), [0x1234567800000000]);
+    assertElementsEquals(msg.getRepeatedSfixed32List(), [-1234]);
+    assertElementsEquals(msg.getRepeatedSfixed64List(), [-0x1234567800000000]);
+    assertElementsEquals(msg.getRepeatedFloatList(), [1.5]);
+    assertElementsEquals(msg.getRepeatedDoubleList(), [-1.5]);
+    assertElementsEquals(msg.getRepeatedBoolList(), [true]);
+    assertElementsEquals(msg.getRepeatedStringList(), ['hello world']);
+    assertEquals(msg.getRepeatedBytesList().length, 1);
+    assertEquals(true, bytesCompare(msg.getRepeatedBytesList()[0], BYTES));
+    assertEquals(msg.getRepeatedForeignMessageList().length, 1);
+    assertEquals(msg.getRepeatedForeignMessageList()[0].getC(), 1000);
+    assertElementsEquals(msg.getRepeatedForeignEnumList(),
+        [proto.jspb.test.Proto3Enum.PROTO3_BAR]);
+
+    assertEquals(msg.getOneofString(), 'asdf');
+  });
+
+
+  /**
+   * Test that oneofs continue to have a notion of field presence.
+   */
+  it('testOneofs', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofUint32(42);
+    assertEquals(msg.getOneofUint32(), 42);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertTrue(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+
+    var submsg = new proto.jspb.test.ForeignMessage();
+    msg.setOneofForeignMessage(submsg);
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), submsg);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofString('hello');
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), 'hello');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertTrue(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofBytes(goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes_asB64(),
+        goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertTrue(msg.hasOneofBytes());
+  });
+
+
+  /**
+   * Test that "default"-valued primitive fields are not emitted on the wire.
+   */
+  it('testNoSerializeDefaults', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    // Set each primitive to a non-default value, then back to its default, to
+    // ensure that the serialization is actually checking the value and not just
+    // whether it has ever been set.
+    msg.setOptionalInt32(42);
+    msg.setOptionalInt32(0);
+    msg.setOptionalDouble(3.14);
+    msg.setOptionalDouble(0.0);
+    msg.setOptionalBool(true);
+    msg.setOptionalBool(false);
+    msg.setOptionalString('hello world');
+    msg.setOptionalString('');
+    msg.setOptionalBytes(goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    msg.setOptionalBytes('');
+    msg.setOptionalForeignMessage(new proto.jspb.test.ForeignMessage());
+    msg.setOptionalForeignMessage(null);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_BAR);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_FOO);
+    msg.setOneofUint32(32);
+    msg.setOneofUint32(null);
+
+
+    var serialized = msg.serializeBinary();
+    assertEquals(0, serialized.length);
+  });
+
+  /**
+   * Test that base64 string and Uint8Array are interchangeable in bytes fields.
+   */
+  it('testBytesFieldsInterop', function() {
+    var msg = new proto.jspb.test.TestProto3();
+    // Set as a base64 string and check all the getters work.
+    msg.setOptionalBytes(BYTES_B64);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    // Test binary serialize round trip doesn't break it.
+    msg = proto.jspb.test.TestProto3.deserializeBinary(msg.serializeBinary());
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg = new proto.jspb.test.TestProto3();
+    // Set as a Uint8Array and check all the getters work.
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+  });
+});
diff --git a/js/compatibility_tests/v3.0.0/proto3_test.proto b/js/compatibility_tests/v3.0.0/proto3_test.proto
new file mode 100644
index 00000000..acb67164
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/proto3_test.proto
@@ -0,0 +1,89 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+import "testbinary.proto";
+
+package jspb.test;
+
+message TestProto3 {
+     int32 optional_int32    =  1;
+     int64 optional_int64    =  2;
+    uint32 optional_uint32   =  3;
+    uint64 optional_uint64   =  4;
+    sint32 optional_sint32   =  5;
+    sint64 optional_sint64   =  6;
+   fixed32 optional_fixed32  =  7;
+   fixed64 optional_fixed64  =  8;
+  sfixed32 optional_sfixed32 =  9;
+  sfixed64 optional_sfixed64 = 10;
+     float optional_float    = 11;
+    double optional_double   = 12;
+      bool optional_bool     = 13;
+    string optional_string   = 14;
+     bytes optional_bytes    = 15;
+
+  ForeignMessage optional_foreign_message = 19;
+  Proto3Enum     optional_foreign_enum    = 22;
+
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated ForeignMessage repeated_foreign_message = 49;
+  repeated Proto3Enum     repeated_foreign_enum    = 52;
+
+
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    ForeignMessage oneof_foreign_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+  }
+}
+
+enum Proto3Enum {
+  PROTO3_FOO = 0;
+  PROTO3_BAR = 1;
+  PROTO3_BAZ = 2;
+}
diff --git a/js/compatibility_tests/v3.0.0/test.proto b/js/compatibility_tests/v3.0.0/test.proto
new file mode 100644
index 00000000..937ffb89
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/test.proto
@@ -0,0 +1,236 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: mwr@google.com (Mark Rawling)
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+import "google/protobuf/descriptor.proto";
+
+package jspb.test;
+
+message Empty {
+}
+
+enum OuterEnum {
+  FOO = 1;
+  BAR = 2;
+}
+
+message EnumContainer {
+  optional OuterEnum outer_enum = 1;
+}
+
+message Simple1 {
+  required string a_string = 1;
+  repeated string a_repeated_string = 2;
+  optional bool a_boolean = 3;
+}
+
+// A message that differs from Simple1 only by name
+message Simple2 {
+  required string a_string = 1;
+  repeated string a_repeated_string = 2;
+}
+
+message SpecialCases {
+  required string normal = 1;
+  // Examples of Js reserved names that are converted to pb_<name>.
+  required string default = 2;
+  required string function = 3;
+  required string var = 4;
+}
+
+message OptionalFields {
+  message Nested {
+    optional int32 an_int = 1;
+  }
+  optional string a_string = 1;
+  required bool a_bool = 2;
+  optional Nested a_nested_message = 3;
+  repeated Nested a_repeated_message = 4;
+  repeated string a_repeated_string = 5;
+}
+
+message HasExtensions {
+  optional string str1 = 1;
+  optional string str2 = 2;
+  optional string str3 = 3;
+  extensions 10 to max;
+}
+
+message Complex {
+  message Nested {
+    required int32 an_int = 2;
+  }
+  required string a_string = 1;
+  required bool an_out_of_order_bool = 9;
+  optional Nested a_nested_message = 4;
+  repeated Nested a_repeated_message = 5;
+  repeated string a_repeated_string = 7;
+}
+
+message OuterMessage {
+  // Make sure this doesn't conflict with the other Complex message.
+  message Complex {
+    optional int32 inner_complex_field = 1;
+  }
+}
+
+message IsExtension {
+  extend HasExtensions {
+    optional IsExtension ext_field = 100;
+  }
+  optional string ext1 = 1;
+
+  // Extensions of proto2 Descriptor messages will be ignored.
+  extend google.protobuf.EnumOptions {
+    optional string simple_option = 42113038;
+  }
+}
+
+message IndirectExtension {
+  extend HasExtensions {
+    optional Simple1 simple = 101;
+    optional string str = 102;
+    repeated string repeated_str = 103;
+    repeated Simple1 repeated_simple = 104;
+  }
+}
+
+extend HasExtensions {
+  optional Simple1 simple1 = 105;
+}
+
+message DefaultValues {
+  enum Enum {
+    E1 = 13;
+    E2 = 77;
+  }
+  optional string string_field = 1 [default="default<>\'\"abc"];
+  optional bool bool_field = 2 [default=true];
+  optional int64 int_field = 3 [default=11];
+  optional Enum enum_field = 4 [default=E1];
+  optional string empty_field = 6 [default=""];
+  optional bytes bytes_field = 8 [default="moo"]; // Base64 encoding is "bW9v"
+}
+
+message FloatingPointFields {
+  optional float optional_float_field = 1;
+  required float required_float_field = 2;
+  repeated float repeated_float_field = 3;
+  optional float default_float_field = 4 [default = 2.0];
+  optional double optional_double_field = 5;
+  required double required_double_field = 6;
+  repeated double repeated_double_field = 7;
+  optional double default_double_field = 8 [default = 2.0];
+}
+
+message TestClone {
+  optional string str = 1;
+  optional Simple1 simple1 = 3;
+  repeated Simple1 simple2 = 5;
+  optional bytes bytes_field = 6;
+  optional string unused = 7;
+  extensions 10 to max;
+}
+
+message CloneExtension {
+  extend TestClone {
+    optional CloneExtension ext_field = 100;
+  }
+  optional string ext = 2;
+}
+
+message TestGroup {
+  repeated group RepeatedGroup = 1 {
+    required string id = 1;
+    repeated bool some_bool = 2;
+  }
+  required group RequiredGroup = 2 {
+    required string id = 1;
+  }
+  optional group OptionalGroup = 3 {
+    required string id = 1;
+  }
+  optional string id = 4;
+  required Simple2 required_simple = 5;
+  optional Simple2 optional_simple = 6;
+}
+
+message TestGroup1 {
+  optional TestGroup.RepeatedGroup group = 1;
+}
+
+message TestReservedNames {
+  optional int32 extension = 1;
+  extensions 10 to max;
+}
+
+message TestReservedNamesExtension {
+  extend TestReservedNames {
+    optional int32 foo = 10;
+  }
+}
+
+message TestMessageWithOneof {
+
+  oneof partial_oneof {
+    string pone = 3;
+    string pthree = 5;
+  }
+
+  oneof recursive_oneof {
+    TestMessageWithOneof rone = 6;
+    string rtwo = 7;
+  }
+
+  optional bool normal_field = 8;
+  repeated string repeated_field = 9;
+
+  oneof default_oneof_a {
+    int32 aone = 10 [default = 1234];
+    int32 atwo = 11;
+  }
+
+  oneof default_oneof_b {
+    int32 bone = 12;
+    int32 btwo = 13 [default = 1234];
+  }
+}
+
+message TestEndsWithBytes {
+  optional int32 value = 1;
+  optional bytes data = 2;
+}
+
diff --git a/js/compatibility_tests/v3.0.0/test.sh b/js/compatibility_tests/v3.0.0/test.sh
new file mode 100755
index 00000000..9d58f30a
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/test.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+
+set -e
+
+# Download protoc 3.0.0 from Maven if it is not already present.
+OLD_PROTOC_URL=https://repo1.maven.org/maven2/com/google/protobuf/protoc/3.0.0/protoc-3.0.0-linux-x86_64.exe
+if [ ! -f protoc ]; then
+  wget $OLD_PROTOC_URL -O protoc
+  chmod +x protoc
+fi
+
+pushd ../..
+npm install && npm test
+popd
+
+old_protoc=./protoc
+new_protoc=../../../src/protoc
+
+# The protos in group 2 have some dependencies on protos in group 1. The tests
+# will verify that the generated code for one group can be regenerated
+# independently of the other group in a compatible way.
+#
+# Note: these lists of protos duplicate the lists in gulpfile.js. Ideally we
+# should find a good way of having a single source of truth for this.
+group1_protos="data.proto test3.proto test5.proto commonjs/test6/test6.proto testbinary.proto testempty.proto test.proto"
+group2_protos="proto3_test.proto test2.proto test4.proto commonjs/test7/test7.proto"
+
+# We test the following cases:
+#
+# Case 1: build groups 1 and 2 with the old protoc
+# Case 2: build group 1 with new protoc but group 2 with old protoc
+# Case 3: build group 1 with old protoc but group 2 with new protoc
+#
+# In each case, we use the current runtime.
+
+#
+# CommonJS tests
+#
+mkdir -p commonjs_out{1,2,3}
+# Case 1
+$old_protoc --js_out=import_style=commonjs,binary:commonjs_out1 -I ../../../src -I commonjs -I . $group1_protos
+$old_protoc --js_out=import_style=commonjs,binary:commonjs_out1 -I ../../../src -I commonjs -I . $group2_protos
+# Case 2
+$new_protoc --js_out=import_style=commonjs,binary:commonjs_out2 -I ../../../src -I commonjs -I . $group1_protos
+$old_protoc --js_out=import_style=commonjs,binary:commonjs_out2 -I ../../../src -I commonjs -I . $group2_protos
+# Case 3
+$old_protoc --js_out=import_style=commonjs,binary:commonjs_out3 -I ../../../src -I commonjs -I . $group1_protos
+$new_protoc --js_out=import_style=commonjs,binary:commonjs_out3 -I ../../../src -I commonjs -I . $group2_protos
+
+mkdir -p commonjs_out/binary
+for file in *_test.js binary/*_test.js; do
+  node commonjs/rewrite_tests_for_commonjs.js < "$file" > "commonjs_out/$file"
+done
+cp commonjs/{jasmine.json,import_test.js} commonjs_out/
+mkdir -p commonjs_out/test_node_modules
+../../node_modules/google-closure-library/closure/bin/calcdeps.py -i commonjs/export_asserts.js -p . -p ../../node_modules/google-closure-library/closure -o compiled --compiler_jar ../../node_modules/google-closure-compiler/compiler.jar > commonjs_out/test_node_modules/closure_asserts_commonjs.js
+../../node_modules/google-closure-library/closure/bin/calcdeps.py -i commonjs/export_testdeps.js -p ../.. -p ../../node_modules/google-closure-library/closure -o compiled --compiler_jar ../../node_modules/google-closure-compiler/compiler.jar > commonjs_out/test_node_modules/testdeps_commonjs.js
+cp ../../google-protobuf.js commonjs_out/test_node_modules
+cp -r ../../commonjs_out/node_modules commonjs_out
+
+echo
+echo "Running tests with CommonJS imports"
+echo "-----------------------------------"
+for i in 1 2 3; do
+  cp -r commonjs_out/* "commonjs_out$i"
+  pushd "commonjs_out$i"
+  JASMINE_CONFIG_PATH=jasmine.json NODE_PATH=test_node_modules ../../../node_modules/.bin/jasmine
+  popd
+done
+
+#
+# Closure tests
+#
+$old_protoc --js_out=library=testproto_libs1,binary:.  -I ../../../src -I commonjs -I . $group1_protos
+$old_protoc --js_out=library=testproto_libs2,binary:.  -I ../../../src -I commonjs -I . $group2_protos
+$new_protoc --js_out=library=testproto_libs1_new,binary:.  -I ../../../src -I commonjs -I . $group1_protos
+$new_protoc --js_out=library=testproto_libs2_new,binary:.  -I ../../../src -I commonjs -I . $group2_protos
+
+echo
+echo "Running tests with Closure-style imports"
+echo "----------------------------------------"
+
+# Case 1
+JASMINE_CONFIG_PATH=jasmine1.json ../../node_modules/.bin/jasmine
+# Case 2
+JASMINE_CONFIG_PATH=jasmine2.json ../../node_modules/.bin/jasmine
+# Case 3
+JASMINE_CONFIG_PATH=jasmine3.json ../../node_modules/.bin/jasmine
+
+# Remove these files so that calcdeps.py does not get confused by them the next
+# time this script runs.
+rm testproto_libs[12]*
diff --git a/js/compatibility_tests/v3.0.0/test2.proto b/js/compatibility_tests/v3.0.0/test2.proto
new file mode 100644
index 00000000..44e55eff
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/test2.proto
@@ -0,0 +1,54 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test;
+
+message TestExtensionsMessage {
+  optional int32 intfield = 1;
+  extensions 100 to max;
+}
+
+message ExtensionMessage {
+  extend TestExtensionsMessage {
+    optional ExtensionMessage ext_field = 100;
+  }
+  optional string ext1 = 1;
+}
+
+// Floating extensions are only supported when generating a _lib.js library.
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field = 101;
+  optional string floating_str_field = 102;
+}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto b/js/compatibility_tests/v3.0.0/test3.proto
index ef4e2d2f..940a552e 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_repeated_merge_nano.proto
+++ b/js/compatibility_tests/v3.0.0/test3.proto
@@ -28,20 +28,26 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+syntax = "proto2";
 
-package protobuf_unittest;
-
-import "google/protobuf/nano/unittest_nano.proto";
-
-option java_package = "com.google.protobuf";
+option java_package = "com.google.apps.jspb.proto";
 option java_multiple_files = true;
 
-// A container message for testing the merging of repeated fields at a
-// nested level. Other tests will be done using the repeated fields in
-// TestAllTypesNano.
-message TestRepeatedMergeNano {
+package jspb.exttest;
 
-  optional TestAllTypesNano contained = 1;
+message TestExtensionsMessage {
+  optional int32 intfield = 1;
+  extensions 100 to max;
+}
+
+message ExtensionMessage {
+  extend TestExtensionsMessage {
+    optional ExtensionMessage ext_field = 100;
+  }
+  optional string ext1 = 1;
+}
 
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field = 101;
+  optional string floating_str_field = 102;
 }
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto b/js/compatibility_tests/v3.0.0/test4.proto
index b31c4399..cf2451e9 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_multiple_nameclash_nano.proto
+++ b/js/compatibility_tests/v3.0.0/test4.proto
@@ -28,14 +28,15 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+syntax = "proto2";
 
-package protobuf_unittest_import;
-
-option java_package = "com.google.protobuf";
-option java_outer_classname = "MultipleNameClashNano";
+option java_package = "com.google.apps.jspb.proto";
 option java_multiple_files = true;
 
-message MultipleNameClashNano {
-  optional int32 field = 1;
+package jspb.exttest;
+
+import "test3.proto";
+
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field_two = 103;
 }
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto b/js/compatibility_tests/v3.0.0/test5.proto
index bbd677cf..34979517 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_stringutf8_nano.proto
+++ b/js/compatibility_tests/v3.0.0/test5.proto
@@ -28,16 +28,17 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: wink@google.com (Wink Saville)
-//
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
 
-package protobuf_unittest_import;
+package jspb.exttest.beta;
 
-option java_package = "com.google.protobuf";
-// Explicit outer classname to suppress legacy info.
-option java_outer_classname = "UnittestStringutf8Nano";
+message TestBetaExtensionsMessage {
+  extensions 100 to max;
+}
 
-message StringUtf8 {
-  optional string id = 1;
-  repeated string rs = 2;
+extend TestBetaExtensionsMessage {
+  optional string floating_str_field = 101;
 }
diff --git a/js/compatibility_tests/v3.0.0/testbinary.proto b/js/compatibility_tests/v3.0.0/testbinary.proto
new file mode 100644
index 00000000..116f17fb
--- /dev/null
+++ b/js/compatibility_tests/v3.0.0/testbinary.proto
@@ -0,0 +1,212 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
+syntax = "proto2";
+
+
+package jspb.test;
+
+// These types are borrowed from `unittest.proto` in the protobuf tree. We want
+// to ensure that the binary-format support will handle all field types
+// properly.
+message TestAllTypes {
+  optional    int32 optional_int32    =  1;
+  optional    int64 optional_int64    =  2;
+  optional   uint32 optional_uint32   =  3;
+  optional   uint64 optional_uint64   =  4;
+  optional   sint32 optional_sint32   =  5;
+  optional   sint64 optional_sint64   =  6;
+  optional  fixed32 optional_fixed32  =  7;
+  optional  fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional    float optional_float    = 11;
+  optional   double optional_double   = 12;
+  optional     bool optional_bool     = 13;
+  optional   string optional_string   = 14;
+  optional    bytes optional_bytes    = 15;
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+
+  optional ForeignMessage                       optional_foreign_message = 19;
+  optional ForeignEnum                          optional_foreign_enum    = 22;
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated group RepeatedGroup = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated ForeignMessage                       repeated_foreign_message = 49;
+  repeated ForeignEnum                          repeated_foreign_enum    = 52;
+
+  // Packed repeated
+  repeated    int32 packed_repeated_int32    = 61 [packed=true];
+  repeated    int64 packed_repeated_int64    = 62 [packed=true];
+  repeated   uint32 packed_repeated_uint32   = 63 [packed=true];
+  repeated   uint64 packed_repeated_uint64   = 64 [packed=true];
+  repeated   sint32 packed_repeated_sint32   = 65 [packed=true];
+  repeated   sint64 packed_repeated_sint64   = 66 [packed=true];
+  repeated  fixed32 packed_repeated_fixed32  = 67 [packed=true];
+  repeated  fixed64 packed_repeated_fixed64  = 68 [packed=true];
+  repeated sfixed32 packed_repeated_sfixed32 = 69 [packed=true];
+  repeated sfixed64 packed_repeated_sfixed64 = 70 [packed=true];
+  repeated    float packed_repeated_float    = 71 [packed=true];
+  repeated   double packed_repeated_double   = 72 [packed=true];
+  repeated     bool packed_repeated_bool     = 73 [packed=true];
+
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    ForeignMessage oneof_foreign_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+  }
+
+}
+
+message ForeignMessage {
+  optional int32 c = 1;
+}
+
+enum ForeignEnum {
+  FOREIGN_FOO = 4;
+  FOREIGN_BAR = 5;
+  FOREIGN_BAZ = 6;
+}
+
+message TestExtendable {
+  extensions 1 to max;
+}
+
+message ExtendsWithMessage {
+  extend TestExtendable {
+    optional ExtendsWithMessage optional_extension = 19;
+    repeated ExtendsWithMessage repeated_extension = 49;
+  }
+  optional int32 foo = 1;
+}
+
+extend TestExtendable {
+  optional    int32 extend_optional_int32    =  1;
+  optional    int64 extend_optional_int64    =  2;
+  optional   uint32 extend_optional_uint32   =  3;
+  optional   uint64 extend_optional_uint64   =  4;
+  optional   sint32 extend_optional_sint32   =  5;
+  optional   sint64 extend_optional_sint64   =  6;
+  optional  fixed32 extend_optional_fixed32  =  7;
+  optional  fixed64 extend_optional_fixed64  =  8;
+  optional sfixed32 extend_optional_sfixed32 =  9;
+  optional sfixed64 extend_optional_sfixed64 = 10;
+  optional    float extend_optional_float    = 11;
+  optional   double extend_optional_double   = 12;
+  optional     bool extend_optional_bool     = 13;
+  optional   string extend_optional_string   = 14;
+  optional    bytes extend_optional_bytes    = 15;
+  optional ForeignEnum extend_optional_foreign_enum    = 22;
+
+  repeated    int32 extend_repeated_int32    = 31;
+  repeated    int64 extend_repeated_int64    = 32;
+  repeated   uint32 extend_repeated_uint32   = 33;
+  repeated   uint64 extend_repeated_uint64   = 34;
+  repeated   sint32 extend_repeated_sint32   = 35;
+  repeated   sint64 extend_repeated_sint64   = 36;
+  repeated  fixed32 extend_repeated_fixed32  = 37;
+  repeated  fixed64 extend_repeated_fixed64  = 38;
+  repeated sfixed32 extend_repeated_sfixed32 = 39;
+  repeated sfixed64 extend_repeated_sfixed64 = 40;
+  repeated    float extend_repeated_float    = 41;
+  repeated   double extend_repeated_double   = 42;
+  repeated     bool extend_repeated_bool     = 43;
+  repeated   string extend_repeated_string   = 44;
+  repeated    bytes extend_repeated_bytes    = 45;
+  repeated ForeignEnum extend_repeated_foreign_enum    = 52;
+
+  repeated    int32 extend_packed_repeated_int32    = 61 [packed=true];
+  repeated    int64 extend_packed_repeated_int64    = 62 [packed=true];
+  repeated   uint32 extend_packed_repeated_uint32   = 63 [packed=true];
+  repeated   uint64 extend_packed_repeated_uint64   = 64 [packed=true];
+  repeated   sint32 extend_packed_repeated_sint32   = 65 [packed=true];
+  repeated   sint64 extend_packed_repeated_sint64   = 66 [packed=true];
+  repeated  fixed32 extend_packed_repeated_fixed32  = 67 [packed=true];
+  repeated  fixed64 extend_packed_repeated_fixed64  = 68 [packed=true];
+  repeated sfixed32 extend_packed_repeated_sfixed32 = 69 [packed=true];
+  repeated sfixed64 extend_packed_repeated_sfixed64 = 70 [packed=true];
+  repeated    float extend_packed_repeated_float    = 71 [packed=true];
+  repeated   double extend_packed_repeated_double   = 72 [packed=true];
+  repeated     bool extend_packed_repeated_bool     = 73 [packed=true];
+  repeated ForeignEnum extend_packed_repeated_foreign_enum    = 82
+      [packed=true];
+
+}
+
+message TestMapFields {
+  map<string, string> map_string_string = 1;
+  map<string, int32> map_string_int32 = 2;
+  map<string, int64> map_string_int64 = 3;
+  map<string, bool> map_string_bool = 4;
+  map<string, double> map_string_double = 5;
+  map<string, MapValueEnum> map_string_enum = 6;
+  map<string, MapValueMessage> map_string_msg = 7;
+
+  map<int32, string> map_int32_string = 8;
+  map<int64, string> map_int64_string = 9;
+  map<bool, string> map_bool_string = 10;
+
+  optional TestMapFields test_map_fields = 11;
+  map<string, TestMapFields> map_string_testmapfields = 12;
+}
+
+enum MapValueEnum {
+  MAP_VALUE_FOO = 0;
+  MAP_VALUE_BAR = 1;
+  MAP_VALUE_BAZ = 2;
+}
+
+message MapValueMessage {
+  optional int32 foo = 1;
+}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_single_nano.proto b/js/compatibility_tests/v3.0.0/testempty.proto
index 7de30c87..960bce4e 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_single_nano.proto
+++ b/js/compatibility_tests/v3.0.0/testempty.proto
@@ -28,11 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+syntax = "proto2";
 
-package protobuf_unittest_import;
+package javatests.com.google.apps.jspb;
 
-option java_package = "com.google.protobuf";
-
-message SingleMessageNano {
-}
diff --git a/js/compatibility_tests/v3.1.0/binary/arith_test.js b/js/compatibility_tests/v3.1.0/binary/arith_test.js
new file mode 100644
index 00000000..89796bf7
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/arith_test.js
@@ -0,0 +1,355 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for Int64-manipulation functions.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author cfallin@google.com (Chris Fallin)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.arith.Int64');
+goog.require('jspb.arith.UInt64');
+
+
+describe('binaryArithTest', function() {
+  /**
+   * Tests comparison operations.
+   */
+  it('testCompare', function() {
+    var a = new jspb.arith.UInt64(1234, 5678);
+    var b = new jspb.arith.UInt64(1234, 5678);
+    assertEquals(a.cmp(b), 0);
+    assertEquals(b.cmp(a), 0);
+    b.lo -= 1;
+    assertEquals(a.cmp(b), 1);
+    assertEquals(b.cmp(a), -1);
+    b.lo += 2;
+    assertEquals(a.cmp(b), -1);
+    assertEquals(b.cmp(a), 1);
+    b.lo = a.lo;
+    b.hi = a.hi - 1;
+    assertEquals(a.cmp(b), 1);
+    assertEquals(b.cmp(a), -1);
+
+    assertEquals(a.zero(), false);
+    assertEquals(a.msb(), false);
+    assertEquals(a.lsb(), false);
+    a.hi = 0;
+    a.lo = 0;
+    assertEquals(a.zero(), true);
+    a.hi = 0x80000000;
+    assertEquals(a.zero(), false);
+    assertEquals(a.msb(), true);
+    a.lo = 0x00000001;
+    assertEquals(a.lsb(), true);
+  });
+
+
+  /**
+   * Tests shifts.
+   */
+  it('testShifts', function() {
+    var a = new jspb.arith.UInt64(1, 0);
+    assertEquals(a.lo, 1);
+    assertEquals(a.hi, 0);
+    var orig = a;
+    a = a.leftShift();
+    assertEquals(orig.lo, 1);  // original unmodified.
+    assertEquals(orig.hi, 0);
+    assertEquals(a.lo, 2);
+    assertEquals(a.hi, 0);
+    a = a.leftShift();
+    assertEquals(a.lo, 4);
+    assertEquals(a.hi, 0);
+    for (var i = 0; i < 29; i++) {
+      a = a.leftShift();
+    }
+    assertEquals(a.lo, 0x80000000);
+    assertEquals(a.hi, 0);
+    a = a.leftShift();
+    assertEquals(a.lo, 0);
+    assertEquals(a.hi, 1);
+    a = a.leftShift();
+    assertEquals(a.lo, 0);
+    assertEquals(a.hi, 2);
+    a = a.rightShift();
+    a = a.rightShift();
+    assertEquals(a.lo, 0x80000000);
+    assertEquals(a.hi, 0);
+    a = a.rightShift();
+    assertEquals(a.lo, 0x40000000);
+    assertEquals(a.hi, 0);
+  });
+
+
+  /**
+   * Tests additions.
+   */
+  it('testAdd', function() {
+    var a = new jspb.arith.UInt64(/* lo = */ 0x89abcdef,
+                                         /* hi = */ 0x01234567);
+    var b = new jspb.arith.UInt64(/* lo = */ 0xff52ab91,
+                                         /* hi = */ 0x92fa2123);
+    // Addition with carry.
+    var c = a.add(b);
+    assertEquals(a.lo, 0x89abcdef);  // originals unmodified.
+    assertEquals(a.hi, 0x01234567);
+    assertEquals(b.lo, 0xff52ab91);
+    assertEquals(b.hi, 0x92fa2123);
+    assertEquals(c.lo, 0x88fe7980);
+    assertEquals(c.hi, 0x941d668b);
+
+    // Simple addition without carry.
+    a.lo = 2;
+    a.hi = 0;
+    b.lo = 3;
+    b.hi = 0;
+    c = a.add(b);
+    assertEquals(c.lo, 5);
+    assertEquals(c.hi, 0);
+  });
+
+
+  /**
+   * Test subtractions.
+   */
+  it('testSub', function() {
+    var kLength = 10;
+    var hiValues = [0x1682ef32,
+                    0x583902f7,
+                    0xb62f5955,
+                    0x6ea99bbf,
+                    0x25a39c20,
+                    0x0700a08b,
+                    0x00f7304d,
+                    0x91a5b5af,
+                    0x89077fd2,
+                    0xe09e347c];
+    var loValues = [0xe1538b18,
+                    0xbeacd556,
+                    0x74100758,
+                    0x96e3cb26,
+                    0x56c37c3f,
+                    0xe00b3f7d,
+                    0x859f25d7,
+                    0xc2ee614a,
+                    0xe1d21cd7,
+                    0x30aae6a4];
+    for (var i = 0; i < kLength; i++) {
+      for (var j = 0; j < kLength; j++) {
+        var a = new jspb.arith.UInt64(loValues[i], hiValues[j]);
+        var b = new jspb.arith.UInt64(loValues[j], hiValues[i]);
+        var c = a.add(b).sub(b);
+        assertEquals(c.hi, a.hi);
+        assertEquals(c.lo, a.lo);
+      }
+    }
+  });
+
+
+  /**
+   * Tests 32-by-32 multiplication.
+   */
+  it('testMul32x32', function() {
+    var testData = [
+      // a        b          low(a*b)   high(a*b)
+      [0xc0abe2f8, 0x1607898a, 0x5de711b0, 0x109471b8],
+      [0x915eb3cb, 0x4fb66d0e, 0xbd0d441a, 0x2d43d0bc],
+      [0xfe4efe70, 0x80b48c37, 0xbcddea10, 0x7fdada0c],
+      [0xe222fd4a, 0xe43d524a, 0xd5e0eb64, 0xc99d549c],
+      [0xd171f469, 0xb94ebd01, 0x4be17969, 0x979bc4fa],
+      [0x829cc1df, 0xe2598b38, 0xf4157dc8, 0x737c12ad],
+      [0xf10c3767, 0x8382881e, 0x942b3612, 0x7bd428b8],
+      [0xb0f6dd24, 0x232597e1, 0x079c98a4, 0x184bbce7],
+      [0xfcdb05a7, 0x902f55bc, 0x636199a4, 0x8e69f412],
+      [0x0dd0bfa9, 0x916e27b1, 0x6e2542d9, 0x07d92e65]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = testData[i][0] >>> 0;
+      var b = testData[i][1] >>> 0;
+      var cLow = testData[i][2] >>> 0;
+      var cHigh = testData[i][3] >>> 0;
+      var c = jspb.arith.UInt64.mul32x32(a, b);
+      assertEquals(c.lo, cLow);
+      assertEquals(c.hi, cHigh);
+    }
+  });
+
+
+  /**
+   * Tests 64-by-32 multiplication.
+   */
+  it('testMul', function() {
+    // 64x32 bits produces 96 bits of product. The multiplication function under
+    // test truncates the top 32 bits, so we compare against a 64-bit expected
+    // product.
+    var testData = [
+      // low(a)   high(a)               low(a*b)   high(a*b)
+      [0xec10955b, 0x360eb168, 0x4b7f3f5b, 0xbfcb7c59, 0x9517da5f],
+      [0x42b000fc, 0x9d101642, 0x6fa1ab72, 0x2584c438, 0x6a9e6d2b],
+      [0xf42d4fb4, 0xae366403, 0xa65a1000, 0x92434000, 0x1ff978df],
+      [0x17e2f56b, 0x25487693, 0xf13f98c7, 0x73794e2d, 0xa96b0c6a],
+      [0x492f241f, 0x76c0eb67, 0x7377ac44, 0xd4336c3c, 0xfc4b1ebe],
+      [0xd6b92321, 0xe184fa48, 0xd6e76904, 0x93141584, 0xcbf44da1],
+      [0x4bf007ea, 0x968c0a9e, 0xf5e4026a, 0x4fdb1ae4, 0x61b9fb7d],
+      [0x10a83be7, 0x2d685ba6, 0xc9e5fb7f, 0x2ad43499, 0x3742473d],
+      [0x2f261829, 0x1aca681a, 0x3d3494e3, 0x8213205b, 0x283719f8],
+      [0xe4f2ce21, 0x2e74b7bd, 0xd801b38b, 0xbc17feeb, 0xc6c44e0f]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var prod = a.mul(testData[i][2]);
+      assertEquals(prod.lo, testData[i][3]);
+      assertEquals(prod.hi, testData[i][4]);
+    }
+  });
+
+
+  /**
+   * Tests 64-div-by-32 division.
+   */
+  it('testDiv', function() {
+    // Compute a/b, yielding quot = a/b and rem = a%b.
+    var testData = [
+      // --- divisors in (0, 2^32-1) to test full divisor range
+      // low(a)   high(a)    b          low(quot)  high(quot) rem
+      [0x712443f1, 0xe85cefcc, 0xc1a7050b, 0x332c79ad, 0x00000001, 0x92ffa882],
+      [0x11912915, 0xb2699eb5, 0x30467cbe, 0xb21b4be4, 0x00000003, 0x283465dd],
+      [0x0d917982, 0x201f2a6e, 0x3f35bf03, 0x8217c8e4, 0x00000000, 0x153402d6],
+      [0xa072c108, 0x74020c96, 0xc60568fd, 0x95f9613e, 0x00000000, 0x3f4676c2],
+      [0xd845d5d8, 0xcdd235c4, 0x20426475, 0x6154e78b, 0x00000006, 0x202fb751],
+      [0xa4dbf71f, 0x9e90465e, 0xf08e022f, 0xa8be947f, 0x00000000, 0xbe43b5ce],
+      [0x3dbe627f, 0xa791f4b9, 0x28a5bd89, 0x1f5dfe93, 0x00000004, 0x02bf9ed4],
+      [0x5c1c53ee, 0xccf5102e, 0x198576e7, 0x07e3ae31, 0x00000008, 0x02ea8fb7],
+      [0xfef1e581, 0x04714067, 0xca6540c1, 0x059e73ec, 0x00000000, 0x31658095],
+      [0x1e2dd90c, 0x13dd6667, 0x8b2184c3, 0x248d1a42, 0x00000000, 0x4ca6d0c6],
+      // --- divisors in (0, 2^16-1) to test larger quotient high-words
+      // low(a)   high(a)    b          low(quot)  high(quot) rem
+      [0x86722b47, 0x2cd57c9a, 0x00003123, 0x2ae41b7a, 0x0000e995, 0x00000f99],
+      [0x1dd7884c, 0xf5e839bc, 0x00009eeb, 0x5c886242, 0x00018c21, 0x000099b6],
+      [0x5c53d625, 0x899fc7e5, 0x000087d7, 0xd625007a, 0x0001035c, 0x000019af],
+      [0x6932d932, 0x9d0a5488, 0x000051fb, 0x9d976143, 0x0001ea63, 0x00004981],
+      [0x4d18bb85, 0x0c92fb31, 0x00001d9f, 0x03265ab4, 0x00006cac, 0x000001b9],
+      [0xbe756768, 0xdea67ccb, 0x00008a03, 0x58add442, 0x00019cff, 0x000056a2],
+      [0xe2466f9a, 0x2521f114, 0x0000c350, 0xa0c0860d, 0x000030ab, 0x0000a48a],
+      [0xf00ddad1, 0xe2f5446a, 0x00002cfc, 0x762697a6, 0x00050b96, 0x00000b69],
+      [0xa879152a, 0x0a70e0a5, 0x00007cdf, 0xb44151b3, 0x00001567, 0x0000363d],
+      [0x7179a74c, 0x46083fff, 0x0000253c, 0x4d39ba6e, 0x0001e17f, 0x00000f84]
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var result = a.div(testData[i][2]);
+      var quotient = result[0];
+      var remainder = result[1];
+      assertEquals(quotient.lo, testData[i][3]);
+      assertEquals(quotient.hi, testData[i][4]);
+      assertEquals(remainder.lo, testData[i][5]);
+    }
+  });
+
+
+  /**
+   * Tests .toString() and .fromString().
+   */
+  it('testStrings', function() {
+    var testData = [
+        [0x5e84c935, 0xcae33d0e, '14619595947299359029'],
+        [0x62b3b8b8, 0x93480544, '10612738313170434232'],
+        [0x319bfb13, 0xc01c4172, '13843011313344445203'],
+        [0x5b8a65fb, 0xa5885b31, '11927883880638080507'],
+        [0x6bdb80f1, 0xb0d1b16b, '12741159895737008369'],
+        [0x4b82b442, 0x2e0d8c97, '3318463081876730946'],
+        [0x780d5208, 0x7d76752c, '9040542135845999112'],
+        [0x2e46800f, 0x0993778d, '690026616168284175'],
+        [0xf00a7e32, 0xcd8e3931, '14811839111111540274'],
+        [0x1baeccd6, 0x923048c4, '10533999535534820566'],
+        [0x03669d29, 0xbff3ab72, '13831587386756603177'],
+        [0x2526073e, 0x01affc81, '121593346566522686'],
+        [0xc24244e0, 0xd7f40d0e, '15561076969511732448'],
+        [0xc56a341e, 0xa68b66a7, '12000798502816461854'],
+        [0x8738d64d, 0xbfe78604, '13828168534871037517'],
+        [0x5baff03b, 0xd7572aea, '15516918227177304123'],
+        [0x4a843d8a, 0x864e132b, '9677693725920476554'],
+        [0x25b4e94d, 0x22b54dc6, '2500990681505655117'],
+        [0x6bbe664b, 0x55a5cc0e, '6171563226690381387'],
+        [0xee916c81, 0xb00aabb3, '12685140089732426881']
+    ];
+
+    for (var i = 0; i < testData.length; i++) {
+      var a = new jspb.arith.UInt64(testData[i][0], testData[i][1]);
+      var roundtrip = jspb.arith.UInt64.fromString(a.toString());
+      assertEquals(roundtrip.lo, a.lo);
+      assertEquals(roundtrip.hi, a.hi);
+      assertEquals(a.toString(), testData[i][2]);
+    }
+  });
+
+
+  /**
+   * Tests signed Int64s. These are built on UInt64s, so we only need to test
+   * the explicit overrides: .toString() and .fromString().
+   */
+  it('testSignedInt64', function() {
+    var testStrings = [
+        '-7847499644178593666',
+        '3771946501229139523',
+        '2872856549054995060',
+        '-5780049594274350904',
+        '3383785956695105201',
+        '2973055184857072610',
+        '-3879428459215627206',
+        '4589812431064156631',
+        '8484075557333689940',
+        '1075325817098092407',
+        '-4346697501012292314',
+        '2488620459718316637',
+        '6112655187423520672',
+        '-3655278273928612104',
+        '3439154019435803196',
+        '1004112478843763757',
+        '-6587790776614368413',
+        '664320065099714586',
+        '4760412909973292912',
+        '-7911903989602274672'
+    ];
+
+    for (var i = 0; i < testStrings.length; i++) {
+      var roundtrip =
+          jspb.arith.Int64.fromString(testStrings[i]).toString();
+      assertEquals(roundtrip, testStrings[i]);
+    }
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/binary/decoder_test.js b/js/compatibility_tests/v3.1.0/binary/decoder_test.js
new file mode 100644
index 00000000..fce2fe18
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/decoder_test.js
@@ -0,0 +1,317 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer decoder.
+ *
+ * There are two particular magic numbers that need to be pointed out -
+ * 2^64-1025 is the largest number representable as both a double and an
+ * unsigned 64-bit integer, and 2^63-513 is the largest number representable as
+ * both a double and a signed 64-bit integer.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryDecoder');
+goog.require('jspb.BinaryEncoder');
+
+
+/**
+ * Tests encoding and decoding of unsigned types.
+ * @param {Function} readValue
+ * @param {Function} writeValue
+ * @param {number} epsilon
+ * @param {number} upperLimit
+ * @param {Function} filter
+ * @suppress {missingProperties|visibility}
+ */
+function doTestUnsignedValue(readValue,
+    writeValue, epsilon, upperLimit, filter) {
+  var encoder = new jspb.BinaryEncoder();
+
+  // Encode zero and limits.
+  writeValue.call(encoder, filter(0));
+  writeValue.call(encoder, filter(epsilon));
+  writeValue.call(encoder, filter(upperLimit));
+
+  // Encode positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    writeValue.call(encoder, filter(cursor));
+  }
+
+  var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+  // Check zero and limits.
+  assertEquals(filter(0), readValue.call(decoder));
+  assertEquals(filter(epsilon), readValue.call(decoder));
+  assertEquals(filter(upperLimit), readValue.call(decoder));
+
+  // Check positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    if (filter(cursor) != readValue.call(decoder)) throw 'fail!';
+  }
+
+  // Encoding values outside the valid range should assert.
+  assertThrows(function() {writeValue.call(encoder, -1);});
+  assertThrows(function() {writeValue.call(encoder, upperLimit * 1.1);});
+}
+
+
+/**
+ * Tests encoding and decoding of signed types.
+ * @param {Function} readValue
+ * @param {Function} writeValue
+ * @param {number} epsilon
+ * @param {number} lowerLimit
+ * @param {number} upperLimit
+ * @param {Function} filter
+ * @suppress {missingProperties}
+ */
+function doTestSignedValue(readValue,
+    writeValue, epsilon, lowerLimit, upperLimit, filter) {
+  var encoder = new jspb.BinaryEncoder();
+
+  // Encode zero and limits.
+  writeValue.call(encoder, filter(lowerLimit));
+  writeValue.call(encoder, filter(-epsilon));
+  writeValue.call(encoder, filter(0));
+  writeValue.call(encoder, filter(epsilon));
+  writeValue.call(encoder, filter(upperLimit));
+
+  var inputValues = [];
+
+  // Encode negative values.
+  for (var cursor = lowerLimit; cursor < -epsilon; cursor /= 1.1) {
+    var val = filter(cursor);
+    writeValue.call(encoder, val);
+    inputValues.push(val);
+  }
+
+  // Encode positive values.
+  for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+    var val = filter(cursor);
+    writeValue.call(encoder, val);
+    inputValues.push(val);
+  }
+
+  var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+  // Check zero and limits.
+  assertEquals(filter(lowerLimit), readValue.call(decoder));
+  assertEquals(filter(-epsilon), readValue.call(decoder));
+  assertEquals(filter(0), readValue.call(decoder));
+  assertEquals(filter(epsilon), readValue.call(decoder));
+  assertEquals(filter(upperLimit), readValue.call(decoder));
+
+  // Verify decoded values.
+  for (var i = 0; i < inputValues.length; i++) {
+    assertEquals(inputValues[i], readValue.call(decoder));
+  }
+
+  // Encoding values outside the valid range should assert.
+  assertThrows(function() {writeValue.call(encoder, lowerLimit * 1.1);});
+  assertThrows(function() {writeValue.call(encoder, upperLimit * 1.1);});
+}
+
+describe('binaryDecoderTest', function() {
+  /**
+   * Tests the decoder instance cache.
+   */
+  it('testInstanceCache', /** @suppress {visibility} */ function() {
+    // Empty the instance caches.
+    jspb.BinaryDecoder.instanceCache_ = [];
+
+    // Allocating and then freeing a decoder should put it in the instance
+    // cache.
+    jspb.BinaryDecoder.alloc().free();
+
+    assertEquals(1, jspb.BinaryDecoder.instanceCache_.length);
+
+    // Allocating and then freeing three decoders should leave us with three in
+    // the cache.
+
+    var decoder1 = jspb.BinaryDecoder.alloc();
+    var decoder2 = jspb.BinaryDecoder.alloc();
+    var decoder3 = jspb.BinaryDecoder.alloc();
+    decoder1.free();
+    decoder2.free();
+    decoder3.free();
+
+    assertEquals(3, jspb.BinaryDecoder.instanceCache_.length);
+  });
+
+
+  /**
+   * Tests reading 64-bit integers as hash strings.
+   */
+  it('testHashStrings', function() {
+    var encoder = new jspb.BinaryEncoder();
+
+    var hashA = String.fromCharCode(0x00, 0x00, 0x00, 0x00,
+                                    0x00, 0x00, 0x00, 0x00);
+    var hashB = String.fromCharCode(0x12, 0x34, 0x00, 0x00,
+                                    0x00, 0x00, 0x00, 0x00);
+    var hashC = String.fromCharCode(0x12, 0x34, 0x56, 0x78,
+                                    0x87, 0x65, 0x43, 0x21);
+    var hashD = String.fromCharCode(0xFF, 0xFF, 0xFF, 0xFF,
+                                    0xFF, 0xFF, 0xFF, 0xFF);
+
+    encoder.writeVarintHash64(hashA);
+    encoder.writeVarintHash64(hashB);
+    encoder.writeVarintHash64(hashC);
+    encoder.writeVarintHash64(hashD);
+
+    encoder.writeFixedHash64(hashA);
+    encoder.writeFixedHash64(hashB);
+    encoder.writeFixedHash64(hashC);
+    encoder.writeFixedHash64(hashD);
+
+    var decoder = jspb.BinaryDecoder.alloc(encoder.end());
+
+    assertEquals(hashA, decoder.readVarintHash64());
+    assertEquals(hashB, decoder.readVarintHash64());
+    assertEquals(hashC, decoder.readVarintHash64());
+    assertEquals(hashD, decoder.readVarintHash64());
+
+    assertEquals(hashA, decoder.readFixedHash64());
+    assertEquals(hashB, decoder.readFixedHash64());
+    assertEquals(hashC, decoder.readFixedHash64());
+    assertEquals(hashD, decoder.readFixedHash64());
+  });
+
+
+  /**
+   * Verifies that misuse of the decoder class triggers assertions.
+   * @suppress {checkTypes|visibility}
+   */
+  it('testDecodeErrors', function() {
+    // Reading a value past the end of the stream should trigger an assertion.
+    var decoder = jspb.BinaryDecoder.alloc([0, 1, 2]);
+    assertThrows(function() {decoder.readUint64()});
+
+    // Overlong varints should trigger assertions.
+    decoder.setBlock([255, 255, 255, 255, 255, 255,
+                      255, 255, 255, 255, 255, 0]);
+    assertThrows(function() {decoder.readUnsignedVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readSignedVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readZigzagVarint64()});
+    decoder.reset();
+    assertThrows(function() {decoder.readUnsignedVarint32()});
+  });
+
+
+  /**
+   * Tests encoding and decoding of unsigned integers.
+   */
+  it('testUnsignedIntegers', function() {
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint8,
+        jspb.BinaryEncoder.prototype.writeUint8,
+        1, 0xFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint16,
+        jspb.BinaryEncoder.prototype.writeUint16,
+        1, 0xFFFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint32,
+        jspb.BinaryEncoder.prototype.writeUint32,
+        1, 0xFFFFFFFF, Math.round);
+
+    doTestUnsignedValue(
+        jspb.BinaryDecoder.prototype.readUint64,
+        jspb.BinaryEncoder.prototype.writeUint64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+  });
+
+
+  /**
+   * Tests encoding and decoding of signed integers.
+   */
+  it('testSignedIntegers', function() {
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt8,
+        jspb.BinaryEncoder.prototype.writeInt8,
+        1, -0x80, 0x7F, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt16,
+        jspb.BinaryEncoder.prototype.writeInt16,
+        1, -0x8000, 0x7FFF, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt32,
+        jspb.BinaryEncoder.prototype.writeInt32,
+        1, -0x80000000, 0x7FFFFFFF, Math.round);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readInt64,
+        jspb.BinaryEncoder.prototype.writeInt64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests encoding and decoding of floats.
+   */
+  it('testFloats', function() {
+    /**
+     * @param {number} x
+     * @return {number}
+     */
+    function truncate(x) {
+      var temp = new Float32Array(1);
+      temp[0] = x;
+      return temp[0];
+    }
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readFloat,
+        jspb.BinaryEncoder.prototype.writeFloat,
+        jspb.BinaryConstants.FLOAT32_EPS,
+        -jspb.BinaryConstants.FLOAT32_MAX,
+        jspb.BinaryConstants.FLOAT32_MAX,
+        truncate);
+
+    doTestSignedValue(
+        jspb.BinaryDecoder.prototype.readDouble,
+        jspb.BinaryEncoder.prototype.writeDouble,
+        jspb.BinaryConstants.FLOAT64_EPS * 10,
+        -jspb.BinaryConstants.FLOAT64_MAX,
+        jspb.BinaryConstants.FLOAT64_MAX,
+        function(x) { return x; });
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/binary/proto_test.js b/js/compatibility_tests/v3.1.0/binary/proto_test.js
new file mode 100644
index 00000000..26e1d30f
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/proto_test.js
@@ -0,0 +1,628 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Test suite is written using Jasmine -- see http://jasmine.github.io/
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+goog.require('jspb.Message');
+
+// CommonJS-LoadFromFile: ../testbinary_pb proto.jspb.test
+goog.require('proto.jspb.test.ExtendsWithMessage');
+goog.require('proto.jspb.test.ForeignEnum');
+goog.require('proto.jspb.test.ForeignMessage');
+goog.require('proto.jspb.test.TestAllTypes');
+goog.require('proto.jspb.test.TestExtendable');
+goog.require('proto.jspb.test.extendOptionalBool');
+goog.require('proto.jspb.test.extendOptionalBytes');
+goog.require('proto.jspb.test.extendOptionalDouble');
+goog.require('proto.jspb.test.extendOptionalFixed32');
+goog.require('proto.jspb.test.extendOptionalFixed64');
+goog.require('proto.jspb.test.extendOptionalFloat');
+goog.require('proto.jspb.test.extendOptionalForeignEnum');
+goog.require('proto.jspb.test.extendOptionalInt32');
+goog.require('proto.jspb.test.extendOptionalInt64');
+goog.require('proto.jspb.test.extendOptionalSfixed32');
+goog.require('proto.jspb.test.extendOptionalSfixed64');
+goog.require('proto.jspb.test.extendOptionalSint32');
+goog.require('proto.jspb.test.extendOptionalSint64');
+goog.require('proto.jspb.test.extendOptionalString');
+goog.require('proto.jspb.test.extendOptionalUint32');
+goog.require('proto.jspb.test.extendOptionalUint64');
+goog.require('proto.jspb.test.extendPackedRepeatedBoolList');
+goog.require('proto.jspb.test.extendPackedRepeatedDoubleList');
+goog.require('proto.jspb.test.extendPackedRepeatedFixed32List');
+goog.require('proto.jspb.test.extendPackedRepeatedFixed64List');
+goog.require('proto.jspb.test.extendPackedRepeatedFloatList');
+goog.require('proto.jspb.test.extendPackedRepeatedForeignEnumList');
+goog.require('proto.jspb.test.extendPackedRepeatedInt32List');
+goog.require('proto.jspb.test.extendPackedRepeatedInt64List');
+goog.require('proto.jspb.test.extendPackedRepeatedSfixed32List');
+goog.require('proto.jspb.test.extendPackedRepeatedSfixed64List');
+goog.require('proto.jspb.test.extendPackedRepeatedSint32List');
+goog.require('proto.jspb.test.extendPackedRepeatedSint64List');
+goog.require('proto.jspb.test.extendPackedRepeatedUint32List');
+goog.require('proto.jspb.test.extendPackedRepeatedUint64List');
+goog.require('proto.jspb.test.extendRepeatedBoolList');
+goog.require('proto.jspb.test.extendRepeatedBytesList');
+goog.require('proto.jspb.test.extendRepeatedDoubleList');
+goog.require('proto.jspb.test.extendRepeatedFixed32List');
+goog.require('proto.jspb.test.extendRepeatedFixed64List');
+goog.require('proto.jspb.test.extendRepeatedFloatList');
+goog.require('proto.jspb.test.extendRepeatedForeignEnumList');
+goog.require('proto.jspb.test.extendRepeatedInt32List');
+goog.require('proto.jspb.test.extendRepeatedInt64List');
+goog.require('proto.jspb.test.extendRepeatedSfixed32List');
+goog.require('proto.jspb.test.extendRepeatedSfixed64List');
+goog.require('proto.jspb.test.extendRepeatedSint32List');
+goog.require('proto.jspb.test.extendRepeatedSint64List');
+goog.require('proto.jspb.test.extendRepeatedStringList');
+goog.require('proto.jspb.test.extendRepeatedUint32List');
+goog.require('proto.jspb.test.extendRepeatedUint64List');
+
+
+var suite = {};
+
+var BYTES = new Uint8Array([1, 2, 8, 9]);
+
+var BYTES_B64 = goog.crypt.base64.encodeByteArray(BYTES);
+
+
+/**
+ * Helper: fill all fields on a TestAllTypes message.
+ * @param {proto.jspb.test.TestAllTypes} msg
+ */
+function fillAllFields(msg) {
+  msg.setOptionalInt32(-42);
+  // can be exactly represented by JS number (64-bit double, i.e., 52-bit
+  // mantissa).
+  msg.setOptionalInt64(-0x7fffffff00000000);
+  msg.setOptionalUint32(0x80000000);
+  msg.setOptionalUint64(0xf000000000000000);
+  msg.setOptionalSint32(-100);
+  msg.setOptionalSint64(-0x8000000000000000);
+  msg.setOptionalFixed32(1234);
+  msg.setOptionalFixed64(0x1234567800000000);
+  msg.setOptionalSfixed32(-1234);
+  msg.setOptionalSfixed64(-0x1234567800000000);
+  msg.setOptionalFloat(1.5);
+  msg.setOptionalDouble(-1.5);
+  msg.setOptionalBool(true);
+  msg.setOptionalString('hello world');
+  msg.setOptionalBytes(BYTES);
+  msg.setOptionalGroup(new proto.jspb.test.TestAllTypes.OptionalGroup());
+  msg.getOptionalGroup().setA(100);
+  var submsg = new proto.jspb.test.ForeignMessage();
+  submsg.setC(16);
+  msg.setOptionalForeignMessage(submsg);
+  msg.setOptionalForeignEnum(proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+  msg.setOneofString('oneof');
+
+
+  msg.setRepeatedInt32List([-42]);
+  msg.setRepeatedInt64List([-0x7fffffff00000000]);
+  msg.setRepeatedUint32List([0x80000000]);
+  msg.setRepeatedUint64List([0xf000000000000000]);
+  msg.setRepeatedSint32List([-100]);
+  msg.setRepeatedSint64List([-0x8000000000000000]);
+  msg.setRepeatedFixed32List([1234]);
+  msg.setRepeatedFixed64List([0x1234567800000000]);
+  msg.setRepeatedSfixed32List([-1234]);
+  msg.setRepeatedSfixed64List([-0x1234567800000000]);
+  msg.setRepeatedFloatList([1.5]);
+  msg.setRepeatedDoubleList([-1.5]);
+  msg.setRepeatedBoolList([true]);
+  msg.setRepeatedStringList(['hello world']);
+  msg.setRepeatedBytesList([BYTES, BYTES]);
+  msg.setRepeatedGroupList([new proto.jspb.test.TestAllTypes.RepeatedGroup()]);
+  msg.getRepeatedGroupList()[0].setA(100);
+  submsg = new proto.jspb.test.ForeignMessage();
+  submsg.setC(1000);
+  msg.setRepeatedForeignMessageList([submsg]);
+  msg.setRepeatedForeignEnumList([proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  msg.setPackedRepeatedInt32List([-42]);
+  msg.setPackedRepeatedInt64List([-0x7fffffff00000000]);
+  msg.setPackedRepeatedUint32List([0x80000000]);
+  msg.setPackedRepeatedUint64List([0xf000000000000000]);
+  msg.setPackedRepeatedSint32List([-100]);
+  msg.setPackedRepeatedSint64List([-0x8000000000000000]);
+  msg.setPackedRepeatedFixed32List([1234]);
+  msg.setPackedRepeatedFixed64List([0x1234567800000000]);
+  msg.setPackedRepeatedSfixed32List([-1234]);
+  msg.setPackedRepeatedSfixed64List([-0x1234567800000000]);
+  msg.setPackedRepeatedFloatList([1.5]);
+  msg.setPackedRepeatedDoubleList([-1.5]);
+  msg.setPackedRepeatedBoolList([true]);
+
+}
+
+
+/**
+ * Helper: compare a bytes field to an expected value
+ * @param {Uint8Array|string} arr
+ * @param {Uint8Array} expected
+ * @return {boolean}
+ */
+function bytesCompare(arr, expected) {
+  if (goog.isString(arr)) {
+    arr = goog.crypt.base64.decodeStringToUint8Array(arr);
+  }
+  if (arr.length != expected.length) {
+    return false;
+  }
+  for (var i = 0; i < arr.length; i++) {
+    if (arr[i] != expected[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+
+/**
+ * Helper: verify contents of given TestAllTypes message as set by
+ * fillAllFields().
+ * @param {proto.jspb.test.TestAllTypes} original
+ * @param {proto.jspb.test.TestAllTypes} copy
+ */
+function checkAllFields(original, copy) {
+  assertTrue(jspb.Message.equals(original, copy));
+
+  assertEquals(copy.getOptionalInt32(), -42);
+  assertEquals(copy.getOptionalInt64(), -0x7fffffff00000000);
+  assertEquals(copy.getOptionalUint32(), 0x80000000);
+  assertEquals(copy.getOptionalUint64(), 0xf000000000000000);
+  assertEquals(copy.getOptionalSint32(), -100);
+  assertEquals(copy.getOptionalSint64(), -0x8000000000000000);
+  assertEquals(copy.getOptionalFixed32(), 1234);
+  assertEquals(copy.getOptionalFixed64(), 0x1234567800000000);
+  assertEquals(copy.getOptionalSfixed32(), -1234);
+  assertEquals(copy.getOptionalSfixed64(), -0x1234567800000000);
+  assertEquals(copy.getOptionalFloat(), 1.5);
+  assertEquals(copy.getOptionalDouble(), -1.5);
+  assertEquals(copy.getOptionalBool(), true);
+  assertEquals(copy.getOptionalString(), 'hello world');
+  assertEquals(true, bytesCompare(copy.getOptionalBytes(), BYTES));
+  assertEquals(true, bytesCompare(copy.getOptionalBytes_asU8(), BYTES));
+  assertEquals(
+      copy.getOptionalBytes_asB64(), goog.crypt.base64.encodeByteArray(BYTES));
+
+  assertEquals(copy.getOptionalGroup().getA(), 100);
+  assertEquals(copy.getOptionalForeignMessage().getC(), 16);
+  assertEquals(copy.getOptionalForeignEnum(),
+      proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+
+
+  assertEquals(copy.getOneofString(), 'oneof');
+  assertEquals(copy.getOneofFieldCase(),
+      proto.jspb.test.TestAllTypes.OneofFieldCase.ONEOF_STRING);
+
+  assertElementsEquals(copy.getRepeatedInt32List(), [-42]);
+  assertElementsEquals(copy.getRepeatedInt64List(), [-0x7fffffff00000000]);
+  assertElementsEquals(copy.getRepeatedUint32List(), [0x80000000]);
+  assertElementsEquals(copy.getRepeatedUint64List(), [0xf000000000000000]);
+  assertElementsEquals(copy.getRepeatedSint32List(), [-100]);
+  assertElementsEquals(copy.getRepeatedSint64List(), [-0x8000000000000000]);
+  assertElementsEquals(copy.getRepeatedFixed32List(), [1234]);
+  assertElementsEquals(copy.getRepeatedFixed64List(), [0x1234567800000000]);
+  assertElementsEquals(copy.getRepeatedSfixed32List(), [-1234]);
+  assertElementsEquals(copy.getRepeatedSfixed64List(), [-0x1234567800000000]);
+  assertElementsEquals(copy.getRepeatedFloatList(), [1.5]);
+  assertElementsEquals(copy.getRepeatedDoubleList(), [-1.5]);
+  assertElementsEquals(copy.getRepeatedBoolList(), [true]);
+  assertElementsEquals(copy.getRepeatedStringList(), ['hello world']);
+  assertEquals(copy.getRepeatedBytesList().length, 2);
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList_asU8()[0], BYTES));
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList()[0], BYTES));
+  assertEquals(true, bytesCompare(copy.getRepeatedBytesList_asU8()[1], BYTES));
+  assertEquals(copy.getRepeatedBytesList_asB64()[0], BYTES_B64);
+  assertEquals(copy.getRepeatedBytesList_asB64()[1], BYTES_B64);
+  assertEquals(copy.getRepeatedGroupList().length, 1);
+  assertEquals(copy.getRepeatedGroupList()[0].getA(), 100);
+  assertEquals(copy.getRepeatedForeignMessageList().length, 1);
+  assertEquals(copy.getRepeatedForeignMessageList()[0].getC(), 1000);
+  assertElementsEquals(copy.getRepeatedForeignEnumList(),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  assertElementsEquals(copy.getPackedRepeatedInt32List(), [-42]);
+  assertElementsEquals(copy.getPackedRepeatedInt64List(),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(copy.getPackedRepeatedUint32List(), [0x80000000]);
+  assertElementsEquals(copy.getPackedRepeatedUint64List(),
+      [0xf000000000000000]);
+  assertElementsEquals(copy.getPackedRepeatedSint32List(), [-100]);
+  assertElementsEquals(copy.getPackedRepeatedSint64List(),
+      [-0x8000000000000000]);
+  assertElementsEquals(copy.getPackedRepeatedFixed32List(), [1234]);
+  assertElementsEquals(copy.getPackedRepeatedFixed64List(),
+      [0x1234567800000000]);
+  assertElementsEquals(copy.getPackedRepeatedSfixed32List(), [-1234]);
+  assertElementsEquals(copy.getPackedRepeatedSfixed64List(),
+      [-0x1234567800000000]);
+  assertElementsEquals(copy.getPackedRepeatedFloatList(), [1.5]);
+  assertElementsEquals(copy.getPackedRepeatedDoubleList(), [-1.5]);
+
+}
+
+
+/**
+ * Helper: verify that all expected extensions are present.
+ * @param {!proto.jspb.test.TestExtendable} msg
+ */
+function checkExtensions(msg) {
+  assertEquals(-42,
+      msg.getExtension(proto.jspb.test.extendOptionalInt32));
+  assertEquals(-0x7fffffff00000000,
+      msg.getExtension(proto.jspb.test.extendOptionalInt64));
+  assertEquals(0x80000000,
+      msg.getExtension(proto.jspb.test.extendOptionalUint32));
+  assertEquals(0xf000000000000000,
+      msg.getExtension(proto.jspb.test.extendOptionalUint64));
+  assertEquals(-100,
+      msg.getExtension(proto.jspb.test.extendOptionalSint32));
+  assertEquals(-0x8000000000000000,
+      msg.getExtension(proto.jspb.test.extendOptionalSint64));
+  assertEquals(1234,
+      msg.getExtension(proto.jspb.test.extendOptionalFixed32));
+  assertEquals(0x1234567800000000,
+      msg.getExtension(proto.jspb.test.extendOptionalFixed64));
+  assertEquals(-1234,
+      msg.getExtension(proto.jspb.test.extendOptionalSfixed32));
+  assertEquals(-0x1234567800000000,
+      msg.getExtension(proto.jspb.test.extendOptionalSfixed64));
+  assertEquals(1.5,
+      msg.getExtension(proto.jspb.test.extendOptionalFloat));
+  assertEquals(-1.5,
+      msg.getExtension(proto.jspb.test.extendOptionalDouble));
+  assertEquals(true,
+      msg.getExtension(proto.jspb.test.extendOptionalBool));
+  assertEquals('hello world',
+      msg.getExtension(proto.jspb.test.extendOptionalString));
+  assertEquals(
+      true, bytesCompare(
+                msg.getExtension(proto.jspb.test.extendOptionalBytes), BYTES));
+  assertEquals(16,
+      msg.getExtension(
+          proto.jspb.test.ExtendsWithMessage.optionalExtension).getFoo());
+
+
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedInt32List),
+      [-42]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedInt64List),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedUint32List),
+      [0x80000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedUint64List),
+      [0xf000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSint32List),
+      [-100]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSint64List),
+      [-0x8000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFixed32List),
+      [1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFixed64List),
+      [0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSfixed32List),
+      [-1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedSfixed64List),
+      [-0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedFloatList),
+      [1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedDoubleList),
+      [-1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedBoolList),
+      [true]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedStringList),
+      ['hello world']);
+  assertEquals(
+      true,
+      bytesCompare(
+          msg.getExtension(proto.jspb.test.extendRepeatedBytesList)[0], BYTES));
+  assertEquals(1000,
+      msg.getExtension(
+          proto.jspb.test.ExtendsWithMessage.repeatedExtensionList)[0]
+      .getFoo());
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendRepeatedForeignEnumList),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedInt32List),
+      [-42]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedInt64List),
+      [-0x7fffffff00000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedUint32List),
+      [0x80000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedUint64List),
+      [0xf000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSint32List),
+      [-100]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSint64List),
+      [-0x8000000000000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFixed32List),
+      [1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFixed64List),
+      [0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSfixed32List),
+      [-1234]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedSfixed64List),
+      [-0x1234567800000000]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedFloatList),
+      [1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedDoubleList),
+      [-1.5]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedBoolList),
+      [true]);
+  assertElementsEquals(
+      msg.getExtension(proto.jspb.test.extendPackedRepeatedForeignEnumList),
+      [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+}
+
+
+describe('protoBinaryTest', function() {
+  /**
+   * Tests a basic serialization-deserializaton round-trip with all supported
+   * field types (on the TestAllTypes message type).
+   */
+  it('testRoundTrip', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    fillAllFields(msg);
+    var encoded = msg.serializeBinary();
+    var decoded = proto.jspb.test.TestAllTypes.deserializeBinary(encoded);
+    checkAllFields(msg, decoded);
+  });
+
+  /**
+   * Test that base64 string and Uint8Array are interchangeable in bytes fields.
+   */
+  it('testBytesFieldsGettersInterop', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    // Set from a base64 string and check all the getters work.
+    msg.setOptionalBytes(BYTES_B64);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    // Test binary serialize round trip doesn't break it.
+    msg = proto.jspb.test.TestAllTypes.deserializeBinary(msg.serializeBinary());
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg = new proto.jspb.test.TestAllTypes();
+    // Set from a Uint8Array and check all the getters work.
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+  });
+
+  /**
+   * Test that bytes setters will receive result of any of the getters.
+   */
+  it('testBytesFieldsSettersInterop', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg.setOptionalBytes(msg.getOptionalBytes());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+    msg.setOptionalBytes(msg.getOptionalBytes_asB64());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+    msg.setOptionalBytes(msg.getOptionalBytes_asU8());
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+  });
+
+  /**
+   * Test that bytes setters will receive result of any of the getters.
+   */
+  it('testRepeatedBytesGetters', function() {
+    var msg = new proto.jspb.test.TestAllTypes();
+
+    function assertGetters() {
+      assertTrue(goog.isString(msg.getRepeatedBytesList_asB64()[0]));
+      assertTrue(goog.isString(msg.getRepeatedBytesList_asB64()[1]));
+      assertTrue(msg.getRepeatedBytesList_asU8()[0] instanceof Uint8Array);
+      assertTrue(msg.getRepeatedBytesList_asU8()[1] instanceof Uint8Array);
+
+      assertTrue(bytesCompare(msg.getRepeatedBytesList()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList()[1], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asB64()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asB64()[1], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asU8()[0], BYTES));
+      assertTrue(bytesCompare(msg.getRepeatedBytesList_asU8()[1], BYTES));
+    }
+
+    msg.setRepeatedBytesList([BYTES, BYTES]);
+    assertGetters();
+
+    msg.setRepeatedBytesList([BYTES_B64, BYTES_B64]);
+    assertGetters();
+
+    msg.setRepeatedBytesList([]);
+    assertEquals(0, msg.getRepeatedBytesList().length);
+    assertEquals(0, msg.getRepeatedBytesList_asB64().length);
+    assertEquals(0, msg.getRepeatedBytesList_asU8().length);
+  });
+
+  /**
+   * Helper: fill all extension values.
+   * @param {proto.jspb.test.TestExtendable} msg
+   */
+  function fillExtensions(msg) {
+    msg.setExtension(
+        proto.jspb.test.extendOptionalInt32, -42);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalInt64, -0x7fffffff00000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalUint32, 0x80000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalUint64, 0xf000000000000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSint32, -100);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSint64, -0x8000000000000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFixed32, 1234);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFixed64, 0x1234567800000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSfixed32, -1234);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalSfixed64, -0x1234567800000000);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalFloat, 1.5);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalDouble, -1.5);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalBool, true);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalString, 'hello world');
+    msg.setExtension(proto.jspb.test.extendOptionalBytes, BYTES);
+    var submsg = new proto.jspb.test.ExtendsWithMessage();
+    submsg.setFoo(16);
+    msg.setExtension(
+        proto.jspb.test.ExtendsWithMessage.optionalExtension, submsg);
+    msg.setExtension(
+        proto.jspb.test.extendOptionalForeignEnum,
+        proto.jspb.test.ForeignEnum.FOREIGN_FOO);
+
+
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedInt32List, [-42]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedInt64List, [-0x7fffffff00000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedUint32List, [0x80000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedUint64List, [0xf000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSint32List, [-100]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSint64List, [-0x8000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFixed32List, [1234]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFixed64List, [0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSfixed32List, [-1234]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedSfixed64List, [-0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedFloatList, [1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedDoubleList, [-1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedBoolList, [true]);
+    msg.setExtension(
+        proto.jspb.test.extendRepeatedStringList, ['hello world']);
+    msg.setExtension(proto.jspb.test.extendRepeatedBytesList, [BYTES]);
+    submsg = new proto.jspb.test.ExtendsWithMessage();
+    submsg.setFoo(1000);
+    msg.setExtension(
+        proto.jspb.test.ExtendsWithMessage.repeatedExtensionList, [submsg]);
+    msg.setExtension(proto.jspb.test.extendRepeatedForeignEnumList,
+        [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedInt32List, [-42]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedInt64List, [-0x7fffffff00000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedUint32List, [0x80000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedUint64List, [0xf000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSint32List, [-100]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSint64List, [-0x8000000000000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFixed32List, [1234]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFixed64List, [0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSfixed32List, [-1234]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedSfixed64List,
+        [-0x1234567800000000]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedFloatList, [1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedDoubleList, [-1.5]);
+    msg.setExtension(
+        proto.jspb.test.extendPackedRepeatedBoolList, [true]);
+    msg.setExtension(proto.jspb.test.extendPackedRepeatedForeignEnumList,
+        [proto.jspb.test.ForeignEnum.FOREIGN_FOO]);
+
+  }
+
+
+  /**
+   * Tests extension serialization and deserialization.
+   */
+  it('testExtensions', function() {
+    var msg = new proto.jspb.test.TestExtendable();
+    fillExtensions(msg);
+    var encoded = msg.serializeBinary();
+    var decoded = proto.jspb.test.TestExtendable.deserializeBinary(encoded);
+    checkExtensions(decoded);
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/binary/reader_test.js b/js/compatibility_tests/v3.1.0/binary/reader_test.js
new file mode 100644
index 00000000..95711385
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/reader_test.js
@@ -0,0 +1,922 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer reader.
+ *
+ * There are two particular magic numbers that need to be pointed out -
+ * 2^64-1025 is the largest number representable as both a double and an
+ * unsigned 64-bit integer, and 2^63-513 is the largest number representable as
+ * both a double and a signed 64-bit integer.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryDecoder');
+goog.require('jspb.BinaryReader');
+goog.require('jspb.BinaryWriter');
+
+
+
+describe('binaryReaderTest', function() {
+  /**
+   * Tests the reader instance cache.
+   */
+  it('testInstanceCaches', /** @suppress {visibility} */ function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    writer.writeMessage(1, dummyMessage, goog.nullFunction);
+    writer.writeMessage(2, dummyMessage, goog.nullFunction);
+
+    var buffer = writer.getResultBuffer();
+
+    // Empty the instance caches.
+    jspb.BinaryReader.instanceCache_ = [];
+
+    // Allocating and then freeing three decoders should leave us with three in
+    // the cache.
+
+    var decoder1 = jspb.BinaryDecoder.alloc();
+    var decoder2 = jspb.BinaryDecoder.alloc();
+    var decoder3 = jspb.BinaryDecoder.alloc();
+    decoder1.free();
+    decoder2.free();
+    decoder3.free();
+
+    assertEquals(3, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Allocating and then freeing a reader should remove one decoder from its
+    // cache, but it should stay stuck to the reader afterwards since we can't
+    // have a reader without a decoder.
+    jspb.BinaryReader.alloc().free();
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(1, jspb.BinaryReader.instanceCache_.length);
+
+    // Allocating a reader should remove a reader from the cache.
+    var reader = jspb.BinaryReader.alloc(buffer);
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Processing the message reuses the current reader.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+    });
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+    });
+
+    assertEquals(false, reader.nextField());
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(0, jspb.BinaryReader.instanceCache_.length);
+
+    // Freeing the reader should put it back into the cache.
+    reader.free();
+
+    assertEquals(2, jspb.BinaryDecoder.instanceCache_.length);
+    assertEquals(1, jspb.BinaryReader.instanceCache_.length);
+  });
+
+
+  /**
+   * @param {number} x
+   * @return {number}
+   */
+  function truncate(x) {
+    var temp = new Float32Array(1);
+    temp[0] = x;
+    return temp[0];
+  }
+
+
+  /**
+   * Verifies that misuse of the reader class triggers assertions.
+   */
+  it('testReadErrors', /** @suppress {checkTypes|visibility} */ function() {
+    // Calling readMessage on a non-delimited field should trigger an
+    // assertion.
+    var reader = jspb.BinaryReader.alloc([8, 1]);
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    reader.nextField();
+    assertThrows(function() {
+      reader.readMessage(dummyMessage, goog.nullFunction);
+    });
+
+    // Reading past the end of the stream should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([9, 1]);
+    reader.nextField();
+    assertThrows(function() {reader.readFixed64()});
+
+    // Reading past the end of a submessage should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([10, 4, 13, 1, 1, 1]);
+    reader.nextField();
+    reader.readMessage(dummyMessage, function() {
+      reader.nextField();
+      assertThrows(function() {reader.readFixed32()});
+    });
+
+    // Skipping an invalid field should trigger an assertion.
+    reader = jspb.BinaryReader.alloc([12, 1]);
+    reader.nextWireType_ = 1000;
+    assertThrows(function() {reader.skipField()});
+
+    // Reading fields with the wrong wire type should assert.
+    reader = jspb.BinaryReader.alloc([9, 0, 0, 0, 0, 0, 0, 0, 0]);
+    reader.nextField();
+    assertThrows(function() {reader.readInt32()});
+    assertThrows(function() {reader.readInt32String()});
+    assertThrows(function() {reader.readInt64()});
+    assertThrows(function() {reader.readInt64String()});
+    assertThrows(function() {reader.readUint32()});
+    assertThrows(function() {reader.readUint32String()});
+    assertThrows(function() {reader.readUint64()});
+    assertThrows(function() {reader.readUint64String()});
+    assertThrows(function() {reader.readSint32()});
+    assertThrows(function() {reader.readBool()});
+    assertThrows(function() {reader.readEnum()});
+
+    reader = jspb.BinaryReader.alloc([8, 1]);
+    reader.nextField();
+    assertThrows(function() {reader.readFixed32()});
+    assertThrows(function() {reader.readFixed64()});
+    assertThrows(function() {reader.readSfixed32()});
+    assertThrows(function() {reader.readSfixed64()});
+    assertThrows(function() {reader.readFloat()});
+    assertThrows(function() {reader.readDouble()});
+
+    assertThrows(function() {reader.readString()});
+    assertThrows(function() {reader.readBytes()});
+  });
+
+
+  /**
+   * Tests encoding and decoding of unsigned field types.
+   * @param {Function} readField
+   * @param {Function} writeField
+   * @param {number} epsilon
+   * @param {number} upperLimit
+   * @param {Function} filter
+   * @private
+   * @suppress {missingProperties}
+   */
+  var doTestUnsignedField_ = function(readField,
+      writeField, epsilon, upperLimit, filter) {
+    assertNotNull(readField);
+    assertNotNull(writeField);
+
+    var writer = new jspb.BinaryWriter();
+
+    // Encode zero and limits.
+    writeField.call(writer, 1, filter(0));
+    writeField.call(writer, 2, filter(epsilon));
+    writeField.call(writer, 3, filter(upperLimit));
+
+    // Encode positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      writeField.call(writer, 4, filter(cursor));
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Check zero and limits.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(filter(0), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(filter(epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(filter(upperLimit), readField.call(reader));
+
+    // Check positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      reader.nextField();
+      if (4 != reader.getFieldNumber()) throw 'fail!';
+      if (filter(cursor) != readField.call(reader)) throw 'fail!';
+    }
+  };
+
+
+  /**
+   * Tests encoding and decoding of signed field types.
+   * @param {Function} readField
+   * @param {Function} writeField
+   * @param {number} epsilon
+   * @param {number} lowerLimit
+   * @param {number} upperLimit
+   * @param {Function} filter
+   * @private
+   * @suppress {missingProperties}
+   */
+  var doTestSignedField_ = function(readField,
+      writeField, epsilon, lowerLimit, upperLimit, filter) {
+    var writer = new jspb.BinaryWriter();
+
+    // Encode zero and limits.
+    writeField.call(writer, 1, filter(lowerLimit));
+    writeField.call(writer, 2, filter(-epsilon));
+    writeField.call(writer, 3, filter(0));
+    writeField.call(writer, 4, filter(epsilon));
+    writeField.call(writer, 5, filter(upperLimit));
+
+    var inputValues = [];
+
+    // Encode negative values.
+    for (var cursor = lowerLimit; cursor < -epsilon; cursor /= 1.1) {
+      var val = filter(cursor);
+      writeField.call(writer, 6, val);
+      inputValues.push({
+        fieldNumber: 6,
+        value: val
+      });
+    }
+
+    // Encode positive values.
+    for (var cursor = epsilon; cursor < upperLimit; cursor *= 1.1) {
+      var val = filter(cursor);
+      writeField.call(writer, 7, val);
+      inputValues.push({
+        fieldNumber: 7,
+        value: val
+      });
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Check zero and limits.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(filter(lowerLimit), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(filter(-epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(filter(0), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(4, reader.getFieldNumber());
+    assertEquals(filter(epsilon), readField.call(reader));
+
+    reader.nextField();
+    assertEquals(5, reader.getFieldNumber());
+    assertEquals(filter(upperLimit), readField.call(reader));
+
+    for (var i = 0; i < inputValues.length; i++) {
+      var expected = inputValues[i];
+      reader.nextField();
+      assertEquals(expected.fieldNumber, reader.getFieldNumber());
+      assertEquals(expected.value, readField.call(reader));
+    }
+  };
+
+
+  /**
+   * Tests fields that use varint encoding.
+   */
+  it('testVarintFields', function() {
+    assertNotUndefined(jspb.BinaryReader.prototype.readUint32);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeUint32);
+    assertNotUndefined(jspb.BinaryReader.prototype.readUint64);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeUint64);
+    assertNotUndefined(jspb.BinaryReader.prototype.readBool);
+    assertNotUndefined(jspb.BinaryWriter.prototype.writeBool);
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readUint32,
+        jspb.BinaryWriter.prototype.writeUint32,
+        1, Math.pow(2, 32) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readUint64,
+        jspb.BinaryWriter.prototype.writeUint64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readInt32,
+        jspb.BinaryWriter.prototype.writeInt32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readInt64,
+        jspb.BinaryWriter.prototype.writeInt64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readEnum,
+        jspb.BinaryWriter.prototype.writeEnum,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readBool,
+        jspb.BinaryWriter.prototype.writeBool,
+        1, 1, function(x) { return !!x; });
+  });
+
+
+  /**
+   * Tests reading a field from hexadecimal string (format: '08 BE EF').
+   * @param {Function} readField
+   * @param {number} expected
+   * @param {string} hexString
+   */
+  function doTestHexStringVarint_(readField, expected, hexString) {
+    var bytesCount = (hexString.length + 1) / 3;
+    var bytes = new Uint8Array(bytesCount);
+    for (var i = 0; i < bytesCount; i++) {
+      bytes[i] = parseInt(hexString.substring(i * 3, i * 3 + 2), 16);
+    }
+    var reader = jspb.BinaryReader.alloc(bytes);
+    reader.nextField();
+    assertEquals(expected, readField.call(reader));
+  }
+
+
+  /**
+   * Tests non-canonical redundant varint decoding.
+   */
+  it('testRedundantVarintFields', function() {
+    assertNotNull(jspb.BinaryReader.prototype.readUint32);
+    assertNotNull(jspb.BinaryReader.prototype.readUint64);
+    assertNotNull(jspb.BinaryReader.prototype.readSint32);
+    assertNotNull(jspb.BinaryReader.prototype.readSint64);
+
+    // uint32 and sint32 take no more than 5 bytes
+    // 08 - field prefix (type = 0 means varint)
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readUint32,
+      12, '08 8C 80 80 80 00');
+
+    // 11 stands for -6 in zigzag encoding
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readSint32,
+      -6, '08 8B 80 80 80 00');
+
+    // uint64 and sint64 take no more than 10 bytes
+    // 08 - field prefix (type = 0 means varint)
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readUint64,
+      12, '08 8C 80 80 80 80 80 80 80 80 00');
+
+    // 11 stands for -6 in zigzag encoding
+    doTestHexStringVarint_(
+      jspb.BinaryReader.prototype.readSint64,
+      -6, '08 8B 80 80 80 80 80 80 80 80 00');
+  });
+
+
+  /**
+   * Tests 64-bit fields that are handled as strings.
+   */
+  it('testStringInt64Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var testSignedData = [
+      '2730538252207801776',
+      '-2688470994844604560',
+      '3398529779486536359',
+      '3568577411627971000',
+      '272477188847484900',
+      '-6649058714086158188',
+      '-7695254765712060806',
+      '-4525541438037104029',
+      '-4993706538836508568',
+      '4990160321893729138'
+    ];
+    var testUnsignedData = [
+      '7822732630241694882',
+      '6753602971916687352',
+      '2399935075244442116',
+      '8724292567325338867',
+      '16948784802625696584',
+      '4136275908516066934',
+      '3575388346793700364',
+      '5167142028379259461',
+      '1557573948689737699',
+      '17100725280812548567'
+    ];
+
+    for (var i = 0; i < testSignedData.length; i++) {
+      writer.writeInt64String(2 * i + 1, testSignedData[i]);
+      writer.writeUint64String(2 * i + 2, testUnsignedData[i]);
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    for (var i = 0; i < testSignedData.length; i++) {
+      reader.nextField();
+      assertEquals(2 * i + 1, reader.getFieldNumber());
+      assertEquals(testSignedData[i], reader.readInt64String());
+      reader.nextField();
+      assertEquals(2 * i + 2, reader.getFieldNumber());
+      assertEquals(testUnsignedData[i], reader.readUint64String());
+    }
+  });
+
+
+  /**
+   * Tests fields that use zigzag encoding.
+   */
+  it('testZigzagFields', function() {
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSint32,
+        jspb.BinaryWriter.prototype.writeSint32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSint64,
+        jspb.BinaryWriter.prototype.writeSint64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests fields that use fixed-length encoding.
+   */
+  it('testFixedFields', function() {
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readFixed32,
+        jspb.BinaryWriter.prototype.writeFixed32,
+        1, Math.pow(2, 32) - 1, Math.round);
+
+    doTestUnsignedField_(
+        jspb.BinaryReader.prototype.readFixed64,
+        jspb.BinaryWriter.prototype.writeFixed64,
+        1, Math.pow(2, 64) - 1025, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSfixed32,
+        jspb.BinaryWriter.prototype.writeSfixed32,
+        1, -Math.pow(2, 31), Math.pow(2, 31) - 1, Math.round);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readSfixed64,
+        jspb.BinaryWriter.prototype.writeSfixed64,
+        1, -Math.pow(2, 63), Math.pow(2, 63) - 513, Math.round);
+  });
+
+
+  /**
+   * Tests floating point fields.
+   */
+  it('testFloatFields', function() {
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readFloat,
+        jspb.BinaryWriter.prototype.writeFloat,
+        jspb.BinaryConstants.FLOAT32_MIN,
+        -jspb.BinaryConstants.FLOAT32_MAX,
+        jspb.BinaryConstants.FLOAT32_MAX,
+        truncate);
+
+    doTestSignedField_(
+        jspb.BinaryReader.prototype.readDouble,
+        jspb.BinaryWriter.prototype.writeDouble,
+        jspb.BinaryConstants.FLOAT64_EPS * 10,
+        -jspb.BinaryConstants.FLOAT64_MIN,
+        jspb.BinaryConstants.FLOAT64_MIN,
+        function(x) { return x; });
+  });
+
+
+  /**
+   * Tests length-delimited string fields.
+   */
+  it('testStringFields', function() {
+    var s1 = 'The quick brown fox jumps over the lazy dog.';
+    var s2 = '人人生而自由，在尊嚴和權利上一律平等。';
+
+    var writer = new jspb.BinaryWriter();
+
+    writer.writeString(1, s1);
+    writer.writeString(2, s2);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(s1, reader.readString());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(s2, reader.readString());
+  });
+
+
+  /**
+   * Tests length-delimited byte fields.
+   */
+  it('testByteFields', function() {
+    var message = [];
+    var lowerLimit = 1;
+    var upperLimit = 256;
+    var scale = 1.1;
+
+    var writer = new jspb.BinaryWriter();
+
+    for (var cursor = lowerLimit; cursor < upperLimit; cursor *= 1.1) {
+      var len = Math.round(cursor);
+      var bytes = [];
+      for (var i = 0; i < len; i++) bytes.push(i % 256);
+
+      writer.writeBytes(len, bytes);
+    }
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    for (var cursor = lowerLimit; reader.nextField(); cursor *= 1.1) {
+      var len = Math.round(cursor);
+      if (len != reader.getFieldNumber()) throw 'fail!';
+
+      var bytes = reader.readBytes();
+      if (len != bytes.length) throw 'fail!';
+      for (var i = 0; i < bytes.length; i++) {
+        if (i % 256 != bytes[i]) throw 'fail!';
+      }
+    }
+  });
+
+
+  /**
+   * Tests nested messages.
+   */
+  it('testNesting', function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    writer.writeInt32(1, 100);
+
+    // Add one message with 3 int fields.
+    writer.writeMessage(2, dummyMessage, function() {
+      writer.writeInt32(3, 300);
+      writer.writeInt32(4, 400);
+      writer.writeInt32(5, 500);
+    });
+
+    // Add one empty message.
+    writer.writeMessage(6, dummyMessage, goog.nullFunction);
+
+    writer.writeInt32(7, 700);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    // Validate outermost message.
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(100, reader.readInt32());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Validate embedded message 1.
+      reader.nextField();
+      assertEquals(3, reader.getFieldNumber());
+      assertEquals(300, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(4, reader.getFieldNumber());
+      assertEquals(400, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(5, reader.getFieldNumber());
+      assertEquals(500, reader.readInt32());
+
+      assertEquals(false, reader.nextField());
+    });
+
+    reader.nextField();
+    assertEquals(6, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Validate embedded message 2.
+
+      assertEquals(false, reader.nextField());
+    });
+
+    reader.nextField();
+    assertEquals(7, reader.getFieldNumber());
+    assertEquals(700, reader.readInt32());
+
+    assertEquals(false, reader.nextField());
+  });
+
+  /**
+   * Tests skipping fields of each type by interleaving them with sentinel
+   * values and skipping everything that's not a sentinel.
+   */
+  it('testSkipField', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var sentinel = 123456789;
+
+    // Write varint fields of different sizes.
+    writer.writeInt32(1, sentinel);
+    writer.writeInt32(1, 1);
+    writer.writeInt32(1, 1000);
+    writer.writeInt32(1, 1000000);
+    writer.writeInt32(1, 1000000000);
+
+    // Write fixed 64-bit encoded fields.
+    writer.writeInt32(2, sentinel);
+    writer.writeDouble(2, 1);
+    writer.writeFixed64(2, 1);
+    writer.writeSfixed64(2, 1);
+
+    // Write fixed 32-bit encoded fields.
+    writer.writeInt32(3, sentinel);
+    writer.writeFloat(3, 1);
+    writer.writeFixed32(3, 1);
+    writer.writeSfixed32(3, 1);
+
+    // Write delimited fields.
+    writer.writeInt32(4, sentinel);
+    writer.writeBytes(4, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+    writer.writeString(4, 'The quick brown fox jumps over the lazy dog');
+
+    // Write a group with a nested group inside.
+    writer.writeInt32(5, sentinel);
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+    writer.writeGroup(5, dummyMessage, function() {
+      writer.writeInt64(42, 42);
+      writer.writeGroup(6, dummyMessage, function() {
+        writer.writeInt64(84, 42);
+      });
+    });
+
+    // Write final sentinel.
+    writer.writeInt32(6, sentinel);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    function skip(field, count) {
+      for (var i = 0; i < count; i++) {
+        reader.nextField();
+        if (field != reader.getFieldNumber()) throw 'fail!';
+        reader.skipField();
+      }
+    }
+
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(1, 4);
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(2, 3);
+
+    reader.nextField();
+    assertEquals(3, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(3, 3);
+
+    reader.nextField();
+    assertEquals(4, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(4, 2);
+
+    reader.nextField();
+    assertEquals(5, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+    skip(5, 1);
+
+    reader.nextField();
+    assertEquals(6, reader.getFieldNumber());
+    assertEquals(sentinel, reader.readInt32());
+  });
+
+
+  /**
+   * Tests packed fields.
+   */
+  it('testPackedFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var sentinel = 123456789;
+
+    var unsignedData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+    var signedData = [-1, 2, -3, 4, -5, 6, -7, 8, -9, 10];
+    var floatData = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.10];
+    var doubleData = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.10];
+    var boolData = [true, false, true, true, false, false, true, false];
+
+    for (var i = 0; i < floatData.length; i++) {
+      floatData[i] = truncate(floatData[i]);
+    }
+
+    writer.writeInt32(1, sentinel);
+
+    writer.writePackedInt32(2, signedData);
+    writer.writePackedInt64(2, signedData);
+    writer.writePackedUint32(2, unsignedData);
+    writer.writePackedUint64(2, unsignedData);
+    writer.writePackedSint32(2, signedData);
+    writer.writePackedSint64(2, signedData);
+    writer.writePackedFixed32(2, unsignedData);
+    writer.writePackedFixed64(2, unsignedData);
+    writer.writePackedSfixed32(2, signedData);
+    writer.writePackedSfixed64(2, signedData);
+    writer.writePackedFloat(2, floatData);
+    writer.writePackedDouble(2, doubleData);
+    writer.writePackedBool(2, boolData);
+    writer.writePackedEnum(2, unsignedData);
+
+    writer.writeInt32(3, sentinel);
+
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    reader.nextField();
+    assertEquals(sentinel, reader.readInt32());
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedInt32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedInt64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedUint32(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedUint64(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSint32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSint64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFixed32(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFixed64(), unsignedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSfixed32(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedSfixed64(), signedData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedFloat(), floatData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedDouble(), doubleData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedBool(), boolData);
+
+    reader.nextField();
+    assertElementsEquals(reader.readPackedEnum(), unsignedData);
+
+    reader.nextField();
+    assertEquals(sentinel, reader.readInt32());
+  });
+
+
+  /**
+   * Byte blobs inside nested messages should always have their byte offset set
+   * relative to the start of the outermost blob, not the start of their parent
+   * blob.
+   */
+  it('testNestedBlobs', function() {
+    // Create a proto consisting of two nested messages, with the inner one
+    // containing a blob of bytes.
+
+    var fieldTag = (1 << 3) | jspb.BinaryConstants.WireType.DELIMITED;
+    var blob = [1, 2, 3, 4, 5];
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    writer.writeMessage(1, dummyMessage, function() {
+      writer.writeMessage(1, dummyMessage, function() {
+        writer.writeBytes(1, blob);
+      });
+    });
+
+    // Peel off the outer two message layers. Each layer should have two bytes
+    // of overhead, one for the field tag and one for the length of the inner
+    // blob.
+
+    var decoder1 = new jspb.BinaryDecoder(writer.getResultBuffer());
+    assertEquals(fieldTag, decoder1.readUnsignedVarint32());
+    assertEquals(blob.length + 4, decoder1.readUnsignedVarint32());
+
+    var decoder2 = new jspb.BinaryDecoder(decoder1.readBytes(blob.length + 4));
+    assertEquals(fieldTag, decoder2.readUnsignedVarint32());
+    assertEquals(blob.length + 2, decoder2.readUnsignedVarint32());
+
+    assertEquals(fieldTag, decoder2.readUnsignedVarint32());
+    assertEquals(blob.length, decoder2.readUnsignedVarint32());
+    var bytes = decoder2.readBytes(blob.length);
+
+    assertElementsEquals(bytes, blob);
+  });
+
+
+  /**
+   * Tests read callbacks.
+   */
+  it('testReadCallbacks', function() {
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    // Add an int, a submessage, and another int.
+    writer.writeInt32(1, 100);
+
+    writer.writeMessage(2, dummyMessage, function() {
+      writer.writeInt32(3, 300);
+      writer.writeInt32(4, 400);
+      writer.writeInt32(5, 500);
+    });
+
+    writer.writeInt32(7, 700);
+
+    // Create the reader and register a custom read callback.
+    var reader = jspb.BinaryReader.alloc(writer.getResultBuffer());
+
+    /**
+     * @param {!jspb.BinaryReader} reader
+     * @return {*}
+     */
+    function readCallback(reader) {
+      reader.nextField();
+      assertEquals(3, reader.getFieldNumber());
+      assertEquals(300, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(4, reader.getFieldNumber());
+      assertEquals(400, reader.readInt32());
+
+      reader.nextField();
+      assertEquals(5, reader.getFieldNumber());
+      assertEquals(500, reader.readInt32());
+
+      assertEquals(false, reader.nextField());
+    };
+
+    reader.registerReadCallback('readCallback', readCallback);
+
+    // Read the container message.
+    reader.nextField();
+    assertEquals(1, reader.getFieldNumber());
+    assertEquals(100, reader.readInt32());
+
+    reader.nextField();
+    assertEquals(2, reader.getFieldNumber());
+    reader.readMessage(dummyMessage, function() {
+      // Decode the embedded message using the registered callback.
+      reader.runReadCallback('readCallback');
+    });
+
+    reader.nextField();
+    assertEquals(7, reader.getFieldNumber());
+    assertEquals(700, reader.readInt32());
+
+    assertEquals(false, reader.nextField());
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/binary/utils_test.js b/js/compatibility_tests/v3.1.0/binary/utils_test.js
new file mode 100644
index 00000000..d27e5ea2
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/utils_test.js
@@ -0,0 +1,668 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's helper functions.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryConstants');
+goog.require('jspb.BinaryWriter');
+goog.require('jspb.utils');
+
+
+/**
+ * @param {number} x
+ * @return {number}
+ */
+function truncate(x) {
+  var temp = new Float32Array(1);
+  temp[0] = x;
+  return temp[0];
+}
+
+
+/**
+ * Converts an 64-bit integer in split representation to a 64-bit hash string
+ * (8 bits encoded per character).
+ * @param {number} bitsLow The low 32 bits of the split 64-bit integer.
+ * @param {number} bitsHigh The high 32 bits of the split 64-bit integer.
+ * @return {string} The encoded hash string, 8 bits per character.
+ */
+function toHashString(bitsLow, bitsHigh) {
+  return String.fromCharCode((bitsLow >>> 0) & 0xFF,
+                             (bitsLow >>> 8) & 0xFF,
+                             (bitsLow >>> 16) & 0xFF,
+                             (bitsLow >>> 24) & 0xFF,
+                             (bitsHigh >>> 0) & 0xFF,
+                             (bitsHigh >>> 8) & 0xFF,
+                             (bitsHigh >>> 16) & 0xFF,
+                             (bitsHigh >>> 24) & 0xFF);
+}
+
+
+describe('binaryUtilsTest', function() {
+  /**
+   * Tests lossless binary-to-decimal conversion.
+   */
+  it('testDecimalConversion', function() {
+    // Check some magic numbers.
+    var result =
+        jspb.utils.joinUnsignedDecimalString(0x89e80001, 0x8ac72304);
+    assertEquals('10000000000000000001', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xacd05f15, 0x1b69b4b);
+    assertEquals('123456789123456789', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xeb1f0ad2, 0xab54a98c);
+    assertEquals('12345678901234567890', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xe3b70cb1, 0x891087b8);
+    assertEquals('9876543210987654321', result);
+
+    // Check limits.
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00000000);
+    assertEquals('0', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0xFFFFFFFF, 0xFFFFFFFF);
+    assertEquals('18446744073709551615', result);
+
+    // Check each bit of the low dword.
+    for (var i = 0; i < 32; i++) {
+      var low = (1 << i) >>> 0;
+      result = jspb.utils.joinUnsignedDecimalString(low, 0);
+      assertEquals('' + Math.pow(2, i), result);
+    }
+
+    // Check the first 20 bits of the high dword.
+    for (var i = 0; i < 20; i++) {
+      var high = (1 << i) >>> 0;
+      result = jspb.utils.joinUnsignedDecimalString(0, high);
+      assertEquals('' + Math.pow(2, 32 + i), result);
+    }
+
+    // V8's internal double-to-string conversion is inaccurate for values above
+    // 2^52, even if they're representable integers - check the rest of the bits
+    // manually against the correct string representations of 2^N.
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00100000);
+    assertEquals('4503599627370496', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00200000);
+    assertEquals('9007199254740992', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00400000);
+    assertEquals('18014398509481984', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x00800000);
+    assertEquals('36028797018963968', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x01000000);
+    assertEquals('72057594037927936', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x02000000);
+    assertEquals('144115188075855872', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x04000000);
+    assertEquals('288230376151711744', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x08000000);
+    assertEquals('576460752303423488', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x10000000);
+    assertEquals('1152921504606846976', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x20000000);
+    assertEquals('2305843009213693952', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x40000000);
+    assertEquals('4611686018427387904', result);
+
+    result = jspb.utils.joinUnsignedDecimalString(0x00000000, 0x80000000);
+    assertEquals('9223372036854775808', result);
+  });
+
+
+  /**
+   * Going from hash strings to decimal strings should also be lossless.
+   */
+  it('testHashToDecimalConversion', function() {
+    var result;
+    var convert = jspb.utils.hash64ToDecimalString;
+
+    result = convert(toHashString(0x00000000, 0x00000000), false);
+    assertEquals('0', result);
+
+    result = convert(toHashString(0x00000000, 0x00000000), true);
+    assertEquals('0', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF), false);
+    assertEquals('18446744073709551615', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF), true);
+    assertEquals('-1', result);
+
+    result = convert(toHashString(0x00000000, 0x80000000), false);
+    assertEquals('9223372036854775808', result);
+
+    result = convert(toHashString(0x00000000, 0x80000000), true);
+    assertEquals('-9223372036854775808', result);
+
+    result = convert(toHashString(0xacd05f15, 0x01b69b4b), false);
+    assertEquals('123456789123456789', result);
+
+    result = convert(toHashString(~0xacd05f15 + 1, ~0x01b69b4b), true);
+    assertEquals('-123456789123456789', result);
+
+    // And converting arrays of hashes should work the same way.
+    result = jspb.utils.hash64ArrayToDecimalStrings([
+      toHashString(0xFFFFFFFF, 0xFFFFFFFF),
+      toHashString(0x00000000, 0x80000000),
+      toHashString(0xacd05f15, 0x01b69b4b)], false);
+    assertEquals(3, result.length);
+    assertEquals('18446744073709551615', result[0]);
+    assertEquals('9223372036854775808', result[1]);
+    assertEquals('123456789123456789', result[2]);
+  });
+
+  /*
+   * Going from decimal strings to hash strings should be lossless.
+   */
+  it('testDecimalToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.decimalStringToHash64;
+
+    result = convert('0');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
+
+    result = convert('-1');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    result = convert('18446744073709551615');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    result = convert('9223372036854775808');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
+
+    result = convert('-9223372036854775808');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80]), result);
+
+    result = convert('123456789123456789');
+    assertEquals(String.fromCharCode.apply(null,
+      [0x15, 0x5F, 0xD0, 0xAC, 0x4B, 0x9B, 0xB6, 0x01]), result);
+
+    result = convert('-123456789123456789');
+    assertEquals(String.fromCharCode.apply(null,
+      [0xEB, 0xA0, 0x2F, 0x53, 0xB4, 0x64, 0x49, 0xFE]), result);
+  });
+
+  /**
+   * Going from hash strings to hex strings should be lossless.
+   */
+  it('testHashToHexConversion', function() {
+    var result;
+    var convert = jspb.utils.hash64ToHexString;
+
+    result = convert(toHashString(0x00000000, 0x00000000));
+    assertEquals('0x0000000000000000', result);
+
+    result = convert(toHashString(0xFFFFFFFF, 0xFFFFFFFF));
+    assertEquals('0xffffffffffffffff', result);
+
+    result = convert(toHashString(0x12345678, 0x9ABCDEF0));
+    assertEquals('0x9abcdef012345678', result);
+  });
+
+
+  /**
+   * Going from hex strings to hash strings should be lossless.
+   */
+  it('testHexToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.hexStringToHash64;
+
+    result = convert('0x0000000000000000');
+    assertEquals(String.fromCharCode.apply(null,
+        [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]), result);
+
+    result = convert('0xffffffffffffffff');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]), result);
+
+    // Hex string is big-endian, hash string is little-endian.
+    result = convert('0x123456789ABCDEF0');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12]), result);
+
+    // Capitalization should not matter.
+    result = convert('0x0000abcdefABCDEF');
+    assertEquals(String.fromCharCode.apply(null,
+        [0xEF, 0xCD, 0xAB, 0xEF, 0xCD, 0xAB, 0x00, 0x00]), result);
+  });
+
+
+  /**
+   * Going from numbers to hash strings should be lossless for up to 53 bits of
+   * precision.
+   */
+  it('testNumberToHashConversion', function() {
+    var result;
+    var convert = jspb.utils.numberToHash64;
+
+    result = convert(0x0000000000000);
+    assertEquals('0x0000000000000000', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0xFFFFFFFFFFFFF);
+    assertEquals('0x000fffffffffffff', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0x123456789ABCD);
+    assertEquals('0x000123456789abcd', jspb.utils.hash64ToHexString(result));
+
+    result = convert(0xDCBA987654321);
+    assertEquals('0x000dcba987654321', jspb.utils.hash64ToHexString(result));
+
+    // 53 bits of precision should not be truncated.
+    result = convert(0x10000000000001);
+    assertEquals('0x0010000000000001', jspb.utils.hash64ToHexString(result));
+
+    // 54 bits of precision should be truncated.
+    result = convert(0x20000000000001);
+    assertNotEquals(
+        '0x0020000000000001', jspb.utils.hash64ToHexString(result));
+  });
+
+
+  /**
+   * Sanity check the behavior of Javascript's strings when doing funny things
+   * with unicode characters.
+   */
+  it('sanityCheckUnicodeStrings', function() {
+    var strings = new Array(65536);
+
+    // All possible unsigned 16-bit values should be storable in a string, they
+    // shouldn't do weird things with the length of the string, and they should
+    // come back out of the string unchanged.
+    for (var i = 0; i < 65536; i++) {
+      strings[i] = 'a' + String.fromCharCode(i) + 'a';
+      if (3 != strings[i].length) throw 'fail!';
+      if (i != strings[i].charCodeAt(1)) throw 'fail!';
+    }
+
+    // Each unicode character should compare equal to itself and not equal to a
+    // different unicode character.
+    for (var i = 0; i < 65536; i++) {
+      if (strings[i] != strings[i]) throw 'fail!';
+      if (strings[i] == strings[(i + 1) % 65536]) throw 'fail!';
+    }
+  });
+
+
+  /**
+   * Tests conversion from 32-bit floating point numbers to split64 numbers.
+   */
+  it('testFloat32ToSplit64', function() {
+    var f32_eps = jspb.BinaryConstants.FLOAT32_EPS;
+    var f32_min = jspb.BinaryConstants.FLOAT32_MIN;
+    var f32_max = jspb.BinaryConstants.FLOAT32_MAX;
+
+    // NaN.
+    jspb.utils.splitFloat32(NaN);
+    if (!isNaN(jspb.utils.joinFloat32(jspb.utils.split64Low,
+                                      jspb.utils.split64High))) {
+      throw 'fail!';
+    }
+
+    /**
+     * @param {number} x
+     * @param {number=} opt_bits
+     */
+    function test(x, opt_bits) {
+      jspb.utils.splitFloat32(x);
+      if (goog.isDef(opt_bits)) {
+        if (opt_bits != jspb.utils.split64Low) throw 'fail!';
+      }
+      if (truncate(x) != jspb.utils.joinFloat32(jspb.utils.split64Low,
+          jspb.utils.split64High)) {
+        throw 'fail!';
+      }
+    }
+
+    // Positive and negative infinity.
+    test(Infinity, 0x7f800000);
+    test(-Infinity, 0xff800000);
+
+    // Positive and negative zero.
+    test(0, 0x00000000);
+    test(-0, 0x80000000);
+
+    // Positive and negative epsilon.
+    test(f32_eps, 0x00000001);
+    test(-f32_eps, 0x80000001);
+
+    // Positive and negative min.
+    test(f32_min, 0x00800000);
+    test(-f32_min, 0x80800000);
+
+    // Positive and negative max.
+    test(f32_max, 0x7F7FFFFF);
+    test(-f32_max, 0xFF7FFFFF);
+
+    // Various positive values.
+    var cursor = f32_eps * 10;
+    while (cursor != Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+
+    // Various negative values.
+    cursor = -f32_eps * 10;
+    while (cursor != -Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+  });
+
+
+  /**
+   * Tests conversion from 64-bit floating point numbers to split64 numbers.
+   */
+  it('testFloat64ToSplit64', function() {
+    var f64_eps = jspb.BinaryConstants.FLOAT64_EPS;
+    var f64_min = jspb.BinaryConstants.FLOAT64_MIN;
+    var f64_max = jspb.BinaryConstants.FLOAT64_MAX;
+
+    // NaN.
+    jspb.utils.splitFloat64(NaN);
+    if (!isNaN(jspb.utils.joinFloat64(jspb.utils.split64Low,
+        jspb.utils.split64High))) {
+      throw 'fail!';
+    }
+
+    /**
+     * @param {number} x
+     * @param {number=} opt_highBits
+     * @param {number=} opt_lowBits
+     */
+    function test(x, opt_highBits, opt_lowBits) {
+      jspb.utils.splitFloat64(x);
+      if (goog.isDef(opt_highBits)) {
+        if (opt_highBits != jspb.utils.split64High) throw 'fail!';
+      }
+      if (goog.isDef(opt_lowBits)) {
+        if (opt_lowBits != jspb.utils.split64Low) throw 'fail!';
+      }
+      if (x != jspb.utils.joinFloat64(jspb.utils.split64Low,
+          jspb.utils.split64High)) {
+        throw 'fail!';
+      }
+    }
+
+    // Positive and negative infinity.
+    test(Infinity, 0x7ff00000, 0x00000000);
+    test(-Infinity, 0xfff00000, 0x00000000);
+
+    // Positive and negative zero.
+    test(0, 0x00000000, 0x00000000);
+    test(-0, 0x80000000, 0x00000000);
+
+    // Positive and negative epsilon.
+    test(f64_eps, 0x00000000, 0x00000001);
+    test(-f64_eps, 0x80000000, 0x00000001);
+
+    // Positive and negative min.
+    test(f64_min, 0x00100000, 0x00000000);
+    test(-f64_min, 0x80100000, 0x00000000);
+
+    // Positive and negative max.
+    test(f64_max, 0x7FEFFFFF, 0xFFFFFFFF);
+    test(-f64_max, 0xFFEFFFFF, 0xFFFFFFFF);
+
+    // Various positive values.
+    var cursor = f64_eps * 10;
+    while (cursor != Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+
+    // Various negative values.
+    cursor = -f64_eps * 10;
+    while (cursor != -Infinity) {
+      test(cursor);
+      cursor *= 1.1;
+    }
+  });
+
+
+  /**
+   * Tests counting packed varints.
+   */
+  it('testCountVarints', function() {
+    var values = [];
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      values.push(Math.floor(i));
+    }
+
+    var writer = new jspb.BinaryWriter();
+    writer.writePackedUint64(1, values);
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+
+    // We should have two more varints than we started with - one for the field
+    // tag, one for the packed length.
+    assertEquals(values.length + 2,
+                 jspb.utils.countVarints(buffer, 0, buffer.length));
+  });
+
+
+  /**
+   * Tests counting matching varint fields.
+   */
+  it('testCountVarintFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeUint64(1, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countVarintFields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeUint64(123456789, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countVarintFields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching fixed32 fields.
+   */
+  it('testCountFixed32Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeFixed32(1, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed32Fields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeFixed32(123456789, Math.floor(i));
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed32Fields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching fixed64 fields.
+   */
+  it('testCountFixed64Fields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeDouble(1, i);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed64Fields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000000000; i *= 1.1) {
+      writer.writeDouble(123456789, i);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countFixed64Fields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests counting matching delimited fields.
+   */
+  it('testCountDelimitedFields', function() {
+    var writer = new jspb.BinaryWriter();
+
+    var count = 0;
+    for (var i = 1; i < 1000; i *= 1.1) {
+      writer.writeBytes(1, [Math.floor(i)]);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    var buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countDelimitedFields(buffer, 0, buffer.length, 1));
+
+    writer = new jspb.BinaryWriter();
+
+    count = 0;
+    for (var i = 1; i < 1000; i *= 1.1) {
+      writer.writeBytes(123456789, [Math.floor(i)]);
+      count++;
+    }
+    writer.writeString(2, 'terminator');
+
+    buffer = new Uint8Array(writer.getResultBuffer());
+    assertEquals(count,
+        jspb.utils.countDelimitedFields(buffer, 0, buffer.length, 123456789));
+  });
+
+
+  /**
+   * Tests byte format for debug strings.
+   */
+  it('testDebugBytesToTextFormat', function() {
+    assertEquals('""', jspb.utils.debugBytesToTextFormat(null));
+    assertEquals('"\\x00\\x10\\xff"',
+        jspb.utils.debugBytesToTextFormat([0, 16, 255]));
+  });
+
+
+  /**
+   * Tests converting byte blob sources into byte blobs.
+   */
+  it('testByteSourceToUint8Array', function() {
+    var convert = jspb.utils.byteSourceToUint8Array;
+
+    var sourceData = [];
+    for (var i = 0; i < 256; i++) {
+      sourceData.push(i);
+    }
+
+    var sourceBytes = new Uint8Array(sourceData);
+    var sourceBuffer = sourceBytes.buffer;
+    var sourceBase64 = goog.crypt.base64.encodeByteArray(sourceData);
+    var sourceString = String.fromCharCode.apply(null, sourceData);
+
+    function check(result) {
+      assertEquals(Uint8Array, result.constructor);
+      assertEquals(sourceData.length, result.length);
+      for (var i = 0; i < result.length; i++) {
+        assertEquals(sourceData[i], result[i]);
+      }
+    }
+
+    // Converting Uint8Arrays into Uint8Arrays should be a no-op.
+    assertEquals(sourceBytes, convert(sourceBytes));
+
+    // Converting Array.<numbers> into Uint8Arrays should work.
+    check(convert(sourceData));
+
+    // Converting ArrayBuffers into Uint8Arrays should work.
+    check(convert(sourceBuffer));
+
+    // Converting base64-encoded strings into Uint8Arrays should work.
+    check(convert(sourceBase64));
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/binary/writer_test.js b/js/compatibility_tests/v3.1.0/binary/writer_test.js
new file mode 100644
index 00000000..d5dadb41
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/binary/writer_test.js
@@ -0,0 +1,122 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @fileoverview Test cases for jspb's binary protocol buffer writer. In
+ * practice BinaryWriter is used to drive the Decoder and Reader test cases,
+ * so only writer-specific tests are here.
+ *
+ * Test suite is written using Jasmine -- see http://jasmine.github.io/
+ *
+ * @author aappleby@google.com (Austin Appleby)
+ */
+
+goog.require('goog.crypt');
+goog.require('goog.testing.asserts');
+goog.require('jspb.BinaryWriter');
+
+
+/**
+ * @param {function()} func This function should throw an error when run.
+ */
+function assertFails(func) {
+  var e = assertThrows(func);
+  //assertNotNull(e.toString().match(/Error/));
+}
+
+
+describe('binaryWriterTest', function() {
+  /**
+   * Verifies that misuse of the writer class triggers assertions.
+   */
+  it('testWriteErrors', function() {
+    // Submessages with invalid field indices should assert.
+    var writer = new jspb.BinaryWriter();
+    var dummyMessage = /** @type {!jspb.BinaryMessage} */({});
+
+    assertFails(function() {
+      writer.writeMessage(-1, dummyMessage, goog.nullFunction);
+    });
+
+    // Writing invalid field indices should assert.
+    writer = new jspb.BinaryWriter();
+    assertFails(function() {writer.writeUint64(-1, 1);});
+
+    // Writing out-of-range field values should assert.
+    writer = new jspb.BinaryWriter();
+
+    assertFails(function() {writer.writeInt32(1, -Infinity);});
+    assertFails(function() {writer.writeInt32(1, Infinity);});
+
+    assertFails(function() {writer.writeInt64(1, -Infinity);});
+    assertFails(function() {writer.writeInt64(1, Infinity);});
+
+    assertFails(function() {writer.writeUint32(1, -1);});
+    assertFails(function() {writer.writeUint32(1, Infinity);});
+
+    assertFails(function() {writer.writeUint64(1, -1);});
+    assertFails(function() {writer.writeUint64(1, Infinity);});
+
+    assertFails(function() {writer.writeSint32(1, -Infinity);});
+    assertFails(function() {writer.writeSint32(1, Infinity);});
+
+    assertFails(function() {writer.writeSint64(1, -Infinity);});
+    assertFails(function() {writer.writeSint64(1, Infinity);});
+
+    assertFails(function() {writer.writeFixed32(1, -1);});
+    assertFails(function() {writer.writeFixed32(1, Infinity);});
+
+    assertFails(function() {writer.writeFixed64(1, -1);});
+    assertFails(function() {writer.writeFixed64(1, Infinity);});
+
+    assertFails(function() {writer.writeSfixed32(1, -Infinity);});
+    assertFails(function() {writer.writeSfixed32(1, Infinity);});
+
+    assertFails(function() {writer.writeSfixed64(1, -Infinity);});
+    assertFails(function() {writer.writeSfixed64(1, Infinity);});
+  });
+
+
+  /**
+   * Basic test of retrieving the result as a Uint8Array buffer
+   */
+  it('testGetResultBuffer', function() {
+    var expected = '0864120b48656c6c6f20776f726c641a0301020320c801';
+
+    var writer = new jspb.BinaryWriter();
+    writer.writeUint32(1, 100);
+    writer.writeString(2, 'Hello world');
+    writer.writeBytes(3, new Uint8Array([1, 2, 3]));
+    writer.writeUint32(4, 200);
+
+    var buffer = writer.getResultBuffer();
+    assertEquals(expected, goog.crypt.byteArrayToHex(buffer));
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/commonjs/test6/test6.proto b/js/compatibility_tests/v3.1.0/commonjs/test6/test6.proto
new file mode 100644
index 00000000..a060925f
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/commonjs/test6/test6.proto
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test.importing;
+
+message ImportedMessage {
+  string string_value = 1;
+}
diff --git a/js/compatibility_tests/v3.1.0/commonjs/test7/test7.proto b/js/compatibility_tests/v3.1.0/commonjs/test7/test7.proto
new file mode 100644
index 00000000..f5574a3d
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/commonjs/test7/test7.proto
@@ -0,0 +1,42 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2016 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test.framing;
+
+import "test6/test6.proto";
+
+message FramingMessage {
+  jspb.test.importing.ImportedMessage imported_message = 1;
+}
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto b/js/compatibility_tests/v3.1.0/data.proto
index 3a1e07f6..74a8a994 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_class_nano.proto
+++ b/js/compatibility_tests/v3.1.0/data.proto
@@ -28,21 +28,24 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: maxtroy@google.com (Max Cai)
+// Author: mwr@google.com (Mark Rawling)
 
-package protobuf_unittest;
+syntax = "proto2";
 
-option java_package = "com.google.protobuf";
-option java_outer_classname = "EnumClassNanos";
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
 
-enum FileScopeEnum {
-  ONE = 1;
-}
+package jspb.test;
 
-message EnumClassNano {
-  enum MessageScopeEnum {
-    TWO = 2;
+// legacy data, must be nested
+message data {
+  message NestedData {
+    required string str = 1;
   }
-  optional FileScopeEnum one = 1 [ default = ONE ];
-  optional MessageScopeEnum two = 2 [ default = TWO ];
 }
+
+// new data, does not require nesting
+message UnnestedData {
+  required string str = 1;
+}
+
diff --git a/js/compatibility_tests/v3.1.0/debug_test.js b/js/compatibility_tests/v3.1.0/debug_test.js
new file mode 100644
index 00000000..702cc76e
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/debug_test.js
@@ -0,0 +1,105 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.setTestOnly();
+
+goog.require('goog.testing.asserts');
+
+// CommonJS-LoadFromFile: google-protobuf
+goog.require('jspb.debug');
+
+// CommonJS-LoadFromFile: test_pb
+goog.require('proto.jspb.test.HasExtensions');
+goog.require('proto.jspb.test.IsExtension');
+goog.require('proto.jspb.test.Simple1');
+
+
+
+describe('debugTest', function() {
+  it('testSimple1', function() {
+    if (COMPILED) {
+      return;
+    }
+    var message = new proto.jspb.test.Simple1();
+    message.setAString('foo');
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aString': 'foo',
+      'aRepeatedStringList': []
+    }, jspb.debug.dump(message));
+
+    message.setABoolean(true);
+    message.setARepeatedStringList(['1', '2']);
+
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aString': 'foo',
+      'aRepeatedStringList': ['1', '2'],
+      'aBoolean': true
+    }, jspb.debug.dump(message));
+
+    message.clearAString();
+
+    assertObjectEquals({
+      $name: 'proto.jspb.test.Simple1',
+      'aRepeatedStringList': ['1', '2'],
+      'aBoolean': true
+    }, jspb.debug.dump(message));
+  });
+
+
+  it('testExtensions', function() {
+    if (COMPILED) {
+      return;
+    }
+    var extension = new proto.jspb.test.IsExtension();
+    extension.setExt1('ext1field');
+    var extendable = new proto.jspb.test.HasExtensions();
+    extendable.setStr1('v1');
+    extendable.setStr2('v2');
+    extendable.setStr3('v3');
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension);
+
+    assertObjectEquals({
+      '$name': 'proto.jspb.test.HasExtensions',
+      'str1': 'v1',
+      'str2': 'v2',
+      'str3': 'v3',
+      '$extensions': {
+        'extField': {
+          '$name': 'proto.jspb.test.IsExtension',
+          'ext1': 'ext1field'
+        },
+        'repeatedSimpleList': []
+      }
+    }, jspb.debug.dump(extendable));
+  });
+
+});
diff --git a/js/compatibility_tests/v3.1.0/maps_test.js b/js/compatibility_tests/v3.1.0/maps_test.js
new file mode 100644
index 00000000..0d442f4f
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/maps_test.js
@@ -0,0 +1,301 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.require('goog.testing.asserts');
+goog.require('goog.userAgent');
+
+// CommonJS-LoadFromFile: testbinary_pb proto.jspb.test
+goog.require('proto.jspb.test.MapValueEnum');
+goog.require('proto.jspb.test.MapValueMessage');
+goog.require('proto.jspb.test.TestMapFields');
+
+// CommonJS-LoadFromFile: test_pb proto.jspb.test
+goog.require('proto.jspb.test.MapValueMessageNoBinary');
+goog.require('proto.jspb.test.TestMapFieldsNoBinary');
+
+/**
+ * Helper: check that the given map has exactly this set of (sorted) entries.
+ * @param {!jspb.Map} map
+ * @param {!Array<!Array<?>>} entries
+ */
+function checkMapEquals(map, entries) {
+  var arr = map.toArray();
+  assertEquals(arr.length, entries.length);
+  for (var i = 0; i < arr.length; i++) {
+    assertElementsEquals(arr[i], entries[i]);
+  }
+}
+
+/**
+ * Converts an ES6 iterator to an array.
+ * @template T
+ * @param {!Iterator<T>} iter an iterator
+ * @return {!Array<T>}
+ */
+function toArray(iter) {
+  var arr = [];
+  while (true) {
+    var val = iter.next();
+    if (val.done) {
+      break;
+    }
+    arr.push(val.value);
+  }
+  return arr;
+}
+
+
+/**
+ * Helper: generate test methods for this TestMapFields class.
+ * @param {?} msgInfo
+ * @param {?} submessageCtor
+ * @param {!string} suffix
+ */
+function makeTests(msgInfo, submessageCtor, suffix) {
+  /**
+   * Helper: fill all maps on a TestMapFields.
+   * @param {?} msg
+   */
+  var fillMapFields = function(msg) {
+    msg.getMapStringStringMap().set('asdf', 'jkl;').set('key 2', 'hello world');
+    msg.getMapStringInt32Map().set('a', 1).set('b', -2);
+    msg.getMapStringInt64Map().set('c', 0x100000000).set('d', 0x200000000);
+    msg.getMapStringBoolMap().set('e', true).set('f', false);
+    msg.getMapStringDoubleMap().set('g', 3.14159).set('h', 2.71828);
+    msg.getMapStringEnumMap()
+        .set('i', proto.jspb.test.MapValueEnum.MAP_VALUE_BAR)
+        .set('j', proto.jspb.test.MapValueEnum.MAP_VALUE_BAZ);
+    msg.getMapStringMsgMap()
+        .set('k', new submessageCtor())
+        .set('l', new submessageCtor());
+    msg.getMapStringMsgMap().get('k').setFoo(42);
+    msg.getMapStringMsgMap().get('l').setFoo(84);
+    msg.getMapInt32StringMap().set(-1, 'a').set(42, 'b');
+    msg.getMapInt64StringMap().set(0x123456789abc, 'c').set(0xcba987654321, 'd');
+    msg.getMapBoolStringMap().set(false, 'e').set(true, 'f');
+  };
+
+  /**
+   * Helper: check all maps on a TestMapFields.
+   * @param {?} msg
+   */
+  var checkMapFields = function(msg) {
+    checkMapEquals(msg.getMapStringStringMap(), [
+          ['asdf', 'jkl;'],
+          ['key 2', 'hello world']
+    ]);
+    checkMapEquals(msg.getMapStringInt32Map(), [
+          ['a', 1],
+          ['b', -2]
+    ]);
+    checkMapEquals(msg.getMapStringInt64Map(), [
+          ['c', 0x100000000],
+          ['d', 0x200000000]
+    ]);
+    checkMapEquals(msg.getMapStringBoolMap(), [
+          ['e', true],
+          ['f', false]
+    ]);
+    checkMapEquals(msg.getMapStringDoubleMap(), [
+          ['g', 3.14159],
+          ['h', 2.71828]
+    ]);
+    checkMapEquals(msg.getMapStringEnumMap(), [
+          ['i', proto.jspb.test.MapValueEnum.MAP_VALUE_BAR],
+          ['j', proto.jspb.test.MapValueEnum.MAP_VALUE_BAZ]
+    ]);
+    checkMapEquals(msg.getMapInt32StringMap(), [
+          [-1, 'a'],
+          [42, 'b']
+    ]);
+    checkMapEquals(msg.getMapInt64StringMap(), [
+          [0x123456789abc, 'c'],
+          [0xcba987654321, 'd']
+    ]);
+    checkMapEquals(msg.getMapBoolStringMap(), [
+          [false, 'e'],
+          [true, 'f']
+    ]);
+
+    assertEquals(msg.getMapStringMsgMap().getLength(), 2);
+    assertEquals(msg.getMapStringMsgMap().get('k').getFoo(), 42);
+    assertEquals(msg.getMapStringMsgMap().get('l').getFoo(), 84);
+
+    var entries = toArray(msg.getMapStringMsgMap().entries());
+    assertEquals(entries.length, 2);
+    entries.forEach(function(entry) {
+      var key = entry[0];
+      var val = entry[1];
+      assert(val === msg.getMapStringMsgMap().get(key));
+    });
+
+    msg.getMapStringMsgMap().forEach(function(val, key) {
+      assert(val === msg.getMapStringMsgMap().get(key));
+    });
+  };
+
+  it('testMapStringStringField' + suffix, function() {
+    var msg = new msgInfo.constructor();
+    assertEquals(msg.getMapStringStringMap().getLength(), 0);
+    assertEquals(msg.getMapStringInt32Map().getLength(), 0);
+    assertEquals(msg.getMapStringInt64Map().getLength(), 0);
+    assertEquals(msg.getMapStringBoolMap().getLength(), 0);
+    assertEquals(msg.getMapStringDoubleMap().getLength(), 0);
+    assertEquals(msg.getMapStringEnumMap().getLength(), 0);
+    assertEquals(msg.getMapStringMsgMap().getLength(), 0);
+
+    // Re-create to clear out any internally-cached wrappers, etc.
+    msg = new msgInfo.constructor();
+    var m = msg.getMapStringStringMap();
+    assertEquals(m.has('asdf'), false);
+    assertEquals(m.get('asdf'), undefined);
+    m.set('asdf', 'hello world');
+    assertEquals(m.has('asdf'), true);
+    assertEquals(m.get('asdf'), 'hello world');
+    m.set('jkl;', 'key 2');
+    assertEquals(m.has('jkl;'), true);
+    assertEquals(m.get('jkl;'), 'key 2');
+    assertEquals(m.getLength(), 2);
+    var it = m.entries();
+    assertElementsEquals(it.next().value, ['asdf', 'hello world']);
+    assertElementsEquals(it.next().value, ['jkl;', 'key 2']);
+    assertEquals(it.next().done, true);
+    checkMapEquals(m, [
+        ['asdf', 'hello world'],
+        ['jkl;', 'key 2']
+    ]);
+    m.del('jkl;');
+    assertEquals(m.has('jkl;'), false);
+    assertEquals(m.get('jkl;'), undefined);
+    assertEquals(m.getLength(), 1);
+    it = m.keys();
+    assertEquals(it.next().value, 'asdf');
+    assertEquals(it.next().done, true);
+    it = m.values();
+    assertEquals(it.next().value, 'hello world');
+    assertEquals(it.next().done, true);
+
+    var count = 0;
+    m.forEach(function(value, key, map) {
+      assertEquals(map, m);
+      assertEquals(key, 'asdf');
+      assertEquals(value, 'hello world');
+      count++;
+    });
+    assertEquals(count, 1);
+
+    m.clear();
+    assertEquals(m.getLength(), 0);
+  });
+
+
+  /**
+   * Tests operations on maps with all key and value types.
+   */
+  it('testAllMapTypes' + suffix, function() {
+    var msg = new msgInfo.constructor();
+    fillMapFields(msg);
+    checkMapFields(msg);
+  });
+
+
+  if (msgInfo.deserializeBinary) {
+    /**
+     * Tests serialization and deserialization in binary format.
+     */
+    it('testBinaryFormat' + suffix, function() {
+      if (goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(10)) {
+        // IE8/9 currently doesn't support binary format because they lack
+        // TypedArray.
+        return;
+      }
+
+      // Check that the format is correct.
+      var msg = new msgInfo.constructor();
+      msg.getMapStringStringMap().set('A', 'a');
+      var serialized = msg.serializeBinary();
+      var expectedSerialized = [
+          0x0a, 0x6, // field 1 (map_string_string), delimited, length 6
+          0x0a, 0x1, // field 1 in submessage (key), delimited, length 1
+          0x41,      // ASCII 'A'
+          0x12, 0x1, // field 2 in submessage (value), delimited, length 1
+          0x61       // ASCII 'a'
+      ];
+      assertEquals(serialized.length, expectedSerialized.length);
+      for (var i = 0; i < serialized.length; i++) {
+        assertEquals(serialized[i], expectedSerialized[i]);
+      }
+
+      // Check that all map fields successfully round-trip.
+      msg = new msgInfo.constructor();
+      fillMapFields(msg);
+      serialized = msg.serializeBinary();
+      var decoded = msgInfo.deserializeBinary(serialized);
+      checkMapFields(decoded);
+    });
+  }
+
+  /**
+   * Exercises the lazy map<->underlying array sync.
+   */
+  it('testLazyMapSync' + suffix, function() {
+    // Start with a JSPB array containing a few map entries.
+    var entries = [
+        ['a', 'entry 1'],
+        ['c', 'entry 2'],
+        ['b', 'entry 3']
+    ];
+    var msg = new msgInfo.constructor([entries]);
+    assertEquals(entries.length, 3);
+    assertEquals(entries[0][0], 'a');
+    assertEquals(entries[1][0], 'c');
+    assertEquals(entries[2][0], 'b');
+    msg.getMapStringStringMap().del('a');
+    assertEquals(entries.length, 3);  // not yet sync'd
+    msg.toArray();                // force a sync
+    assertEquals(entries.length, 2);
+    assertEquals(entries[0][0], 'b'); // now in sorted order
+    assertEquals(entries[1][0], 'c');
+
+    var a = msg.toArray();
+    assertEquals(a[0], entries);  // retains original reference
+  });
+}
+
+describe('mapsTest', function() {
+  makeTests({
+    constructor: proto.jspb.test.TestMapFields,
+    deserializeBinary: proto.jspb.test.TestMapFields.deserializeBinary
+  }, proto.jspb.test.MapValueMessage, "_Binary");
+  makeTests({
+    constructor: proto.jspb.test.TestMapFieldsNoBinary,
+    deserializeBinary: null
+  }, proto.jspb.test.MapValueMessageNoBinary, "_NoBinary");
+});
diff --git a/js/compatibility_tests/v3.1.0/message_test.js b/js/compatibility_tests/v3.1.0/message_test.js
new file mode 100644
index 00000000..c1023784
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/message_test.js
@@ -0,0 +1,1032 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Test suite is written using Jasmine -- see http://jasmine.github.io/
+
+goog.setTestOnly();
+
+goog.require('goog.json');
+goog.require('goog.testing.asserts');
+goog.require('goog.userAgent');
+
+// CommonJS-LoadFromFile: google-protobuf jspb
+goog.require('jspb.Message');
+
+// CommonJS-LoadFromFile: test5_pb proto.jspb.exttest.beta
+goog.require('proto.jspb.exttest.beta.floatingStrField');
+
+// CommonJS-LoadFromFile: test3_pb proto.jspb.exttest
+goog.require('proto.jspb.exttest.floatingMsgField');
+
+// CommonJS-LoadFromFile: test4_pb proto.jspb.exttest
+goog.require('proto.jspb.exttest.floatingMsgFieldTwo');
+
+// CommonJS-LoadFromFile: test_pb proto.jspb.test
+goog.require('proto.jspb.test.CloneExtension');
+goog.require('proto.jspb.test.Complex');
+goog.require('proto.jspb.test.DefaultValues');
+goog.require('proto.jspb.test.Empty');
+goog.require('proto.jspb.test.EnumContainer');
+goog.require('proto.jspb.test.floatingMsgField');
+goog.require('proto.jspb.test.FloatingPointFields');
+goog.require('proto.jspb.test.floatingStrField');
+goog.require('proto.jspb.test.HasExtensions');
+goog.require('proto.jspb.test.IndirectExtension');
+goog.require('proto.jspb.test.IsExtension');
+goog.require('proto.jspb.test.OptionalFields');
+goog.require('proto.jspb.test.OuterEnum');
+goog.require('proto.jspb.test.OuterMessage.Complex');
+goog.require('proto.jspb.test.Simple1');
+goog.require('proto.jspb.test.Simple2');
+goog.require('proto.jspb.test.SpecialCases');
+goog.require('proto.jspb.test.TestClone');
+goog.require('proto.jspb.test.TestEndsWithBytes');
+goog.require('proto.jspb.test.TestGroup');
+goog.require('proto.jspb.test.TestGroup1');
+goog.require('proto.jspb.test.TestMessageWithOneof');
+goog.require('proto.jspb.test.TestReservedNames');
+goog.require('proto.jspb.test.TestReservedNamesExtension');
+
+// CommonJS-LoadFromFile: test2_pb proto.jspb.test
+goog.require('proto.jspb.test.ExtensionMessage');
+goog.require('proto.jspb.test.TestExtensionsMessage');
+
+
+
+
+describe('Message test suite', function() {
+  it('testEmptyProto', function() {
+    var empty1 = new proto.jspb.test.Empty([]);
+    var empty2 = new proto.jspb.test.Empty([]);
+    assertObjectEquals({}, empty1.toObject());
+    assertObjectEquals('Message should not be corrupted:', empty2, empty1);
+  });
+
+  it('testTopLevelEnum', function() {
+    var response = new proto.jspb.test.EnumContainer([]);
+    response.setOuterEnum(proto.jspb.test.OuterEnum.FOO);
+    assertEquals(proto.jspb.test.OuterEnum.FOO, response.getOuterEnum());
+  });
+
+  it('testByteStrings', function() {
+    var data = new proto.jspb.test.DefaultValues([]);
+    data.setBytesField('some_bytes');
+    assertEquals('some_bytes', data.getBytesField());
+  });
+
+  it('testComplexConversion', function() {
+    var data1 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var data2 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var foo = new proto.jspb.test.Complex(data1);
+    var bar = new proto.jspb.test.Complex(data2);
+    var result = foo.toObject();
+    assertObjectEquals({
+      aString: 'a',
+      anOutOfOrderBool: 1,
+      aNestedMessage: {
+        anInt: 11
+      },
+      aRepeatedMessageList: [{anInt: 22}, {anInt: 33}],
+      aRepeatedStringList: ['s1', 's2']
+    }, result);
+
+    // Now test with the jspb instances included.
+    result = foo.toObject(true /* opt_includeInstance */);
+    assertObjectEquals({
+      aString: 'a',
+      anOutOfOrderBool: 1,
+      aNestedMessage: {
+        anInt: 11,
+        $jspbMessageInstance: foo.getANestedMessage()
+      },
+      aRepeatedMessageList: [
+        {anInt: 22, $jspbMessageInstance: foo.getARepeatedMessageList()[0]},
+        {anInt: 33, $jspbMessageInstance: foo.getARepeatedMessageList()[1]}
+      ],
+      aRepeatedStringList: ['s1', 's2'],
+      $jspbMessageInstance: foo
+    }, result);
+
+  });
+
+  it('testMissingFields', function() {
+    var foo = new proto.jspb.test.Complex([
+        undefined, undefined, undefined, [],
+        undefined, undefined, undefined, undefined]);
+    var bar = new proto.jspb.test.Complex([
+        undefined, undefined, undefined, [],
+        undefined, undefined, undefined, undefined]);
+    var result = foo.toObject();
+    assertObjectEquals({
+      aString: undefined,
+      anOutOfOrderBool: undefined,
+      aNestedMessage: {
+        anInt: undefined
+      },
+      // Note: JsPb converts undefined repeated fields to empty arrays.
+      aRepeatedMessageList: [],
+      aRepeatedStringList: []
+    }, result);
+
+  });
+
+  it('testNestedComplexMessage', function() {
+    // Instantiate the message and set a unique field, just to ensure that we
+    // are not getting jspb.test.Complex instead.
+    var msg = new proto.jspb.test.OuterMessage.Complex();
+    msg.setInnerComplexField(5);
+  });
+
+  it('testSpecialCases', function() {
+    // Note: Some property names are reserved in JavaScript.
+    // These names are converted to the Js property named pb_<reserved_name>.
+    var special =
+        new proto.jspb.test.SpecialCases(['normal', 'default', 'function',
+        'var']);
+    var result = special.toObject();
+    assertObjectEquals({
+      normal: 'normal',
+      pb_default: 'default',
+      pb_function: 'function',
+      pb_var: 'var'
+    }, result);
+  });
+
+  it('testDefaultValues', function() {
+    var defaultString = "default<>\'\"abc";
+    var response = new proto.jspb.test.DefaultValues();
+
+    // Test toObject
+    var expectedObject = {
+      stringField: defaultString,
+      boolField: true,
+      intField: 11,
+      enumField: 13,
+      emptyField: '',
+      bytesField: 'bW9v'
+    };
+    assertObjectEquals(expectedObject, response.toObject());
+
+
+    // Test getters
+    response = new proto.jspb.test.DefaultValues();
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertEquals('', response.getEmptyField());
+    assertEquals('bW9v', response.getBytesField());
+
+    function makeDefault(values) {
+      return new proto.jspb.test.DefaultValues(values);
+    }
+
+    // Test with undefined values,
+    // Use push to workaround IE treating undefined array elements as holes.
+    response = makeDefault([undefined, undefined, undefined, undefined]);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test with null values, as would be returned by a JSON serializer.
+    response = makeDefault([null, null, null, null]);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test with false-like values.
+    response = makeDefault(['', false, 0, 0]);
+    assertEquals('', response.getStringField());
+    assertEquals(false, response.getBoolField());
+    assertEquals(true, response.getIntField() == 0);
+    assertEquals(true, response.getEnumField() == 0);
+    assertTrue(response.hasStringField());
+    assertTrue(response.hasBoolField());
+    assertTrue(response.hasIntField());
+    assertTrue(response.hasEnumField());
+
+    // Test that clearing the values reverts them to the default state.
+    response = makeDefault(['blah', false, 111, 77]);
+    response.clearStringField(); response.clearBoolField();
+    response.clearIntField(); response.clearEnumField();
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+
+    // Test that setFoo(null) clears the values.
+    response = makeDefault(['blah', false, 111, 77]);
+    response.setStringField(null); response.setBoolField(null);
+    response.setIntField(undefined); response.setEnumField(undefined);
+    assertEquals(defaultString, response.getStringField());
+    assertEquals(true, response.getBoolField());
+    assertEquals(11, response.getIntField());
+    assertEquals(13, response.getEnumField());
+    assertFalse(response.hasStringField());
+    assertFalse(response.hasBoolField());
+    assertFalse(response.hasIntField());
+    assertFalse(response.hasEnumField());
+  });
+
+  it('testClearFields', function() {
+    var data = ['str', true, [11], [[22], [33]], ['s1', 's2']];
+    var foo = new proto.jspb.test.OptionalFields(data);
+    foo.clearAString();
+    foo.clearABool();
+    foo.clearANestedMessage();
+    foo.clearARepeatedMessageList();
+    foo.clearARepeatedStringList();
+    assertEquals('', foo.getAString());
+    assertEquals(false, foo.getABool());
+    assertUndefined(foo.getANestedMessage());
+    assertFalse(foo.hasAString());
+    assertFalse(foo.hasABool());
+    assertObjectEquals([], foo.getARepeatedMessageList());
+    assertObjectEquals([], foo.getARepeatedStringList());
+    // NOTE: We want the missing fields in 'expected' to be undefined,
+    // but we actually get a sparse array instead. We could use something
+    // like [1,undefined,2] to avoid this, except that this is still
+    // sparse on IE. No comment...
+    var expected = [,,, [], []];
+    expected[0] = expected[1] = expected[2] = undefined;
+    assertObjectEquals(expected, foo.toArray());
+  });
+
+  it('testDifferenceRawObject', /** @suppress {visibility} */ function() {
+    var p1 = new proto.jspb.test.HasExtensions(['hi', 'diff', {}]);
+    var p2 = new proto.jspb.test.HasExtensions(['hi', 'what',
+                                               {1000: 'unique'}]);
+    var diff = /** @type {proto.jspb.test.HasExtensions} */
+        (jspb.Message.difference(p1, p2));
+    assertEquals('', diff.getStr1());
+    assertEquals('what', diff.getStr2());
+    assertEquals('', diff.getStr3());
+    assertEquals('unique', diff.extensionObject_[1000]);
+  });
+
+  it('testEqualsSimple', function() {
+    var s1 = new proto.jspb.test.Simple1(['hi']);
+    assertTrue(jspb.Message.equals(s1, new proto.jspb.test.Simple1(['hi'])));
+    assertFalse(jspb.Message.equals(s1, new proto.jspb.test.Simple1(['bye'])));
+    var s1b = new proto.jspb.test.Simple1(['hi', ['hello']]);
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', ['hello']])));
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', ['hello', undefined,
+                                            undefined, undefined]])));
+    assertFalse(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['no', ['hello']])));
+    // Test with messages of different types
+    var s2 = new proto.jspb.test.Simple2(['hi']);
+    assertFalse(jspb.Message.equals(s1, s2));
+  });
+
+  it('testEquals_softComparison', function() {
+    var s1 = new proto.jspb.test.Simple1(['hi', [], null]);
+    assertTrue(jspb.Message.equals(s1,
+        new proto.jspb.test.Simple1(['hi', []])));
+
+    var s1b = new proto.jspb.test.Simple1(['hi', [], true]);
+    assertTrue(jspb.Message.equals(s1b,
+        new proto.jspb.test.Simple1(['hi', [], 1])));
+  });
+
+  it('testEqualsComplex', function() {
+    var data1 = ['a',,, [, 11], [[, 22], [, 33]],, ['s1', 's2'],, 1];
+    var data2 = ['a',,, [, 11], [[, 22], [, 34]],, ['s1', 's2'],, 1];
+    var data3 = ['a',,, [, 11], [[, 22]],, ['s1', 's2'],, 1];
+    var data4 = ['hi'];
+    var c1a = new proto.jspb.test.Complex(data1);
+    var c1b = new proto.jspb.test.Complex(data1);
+    var c2 = new proto.jspb.test.Complex(data2);
+    var c3 = new proto.jspb.test.Complex(data3);
+    var s1 = new proto.jspb.test.Simple1(data4);
+
+    assertTrue(jspb.Message.equals(c1a, c1b));
+    assertFalse(jspb.Message.equals(c1a, c2));
+    assertFalse(jspb.Message.equals(c2, c3));
+    assertFalse(jspb.Message.equals(c1a, s1));
+  });
+
+  it('testEqualsExtensionsConstructed', function() {
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([]),
+        new proto.jspb.test.HasExtensions([{}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}])
+    ));
+    assertFalse(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'b'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([,,, {100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions([,,, {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions([{100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi',,, {100: [{200: 'a'}]}])
+    ));
+    assertTrue(jspb.Message.equals(
+        new proto.jspb.test.HasExtensions(['hi',,, {100: [{200: 'a'}]}]),
+        new proto.jspb.test.HasExtensions(['hi', {100: [{200: 'a'}]}])
+    ));
+  });
+
+  it('testEqualsExtensionsUnconstructed', function() {
+    assertTrue(jspb.Message.compareFields([], [{}]));
+    assertTrue(jspb.Message.compareFields([,,, {}], []));
+    assertTrue(jspb.Message.compareFields([,,, {}], [,, {}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi', {100: [{200: 'a'}]}]));
+    assertFalse(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi', {100: [{200: 'b'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [{100: [{200: 'a'}]}], [{100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [{100: [{200: 'a'}]}], [,,, {100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        [,,, {100: [{200: 'a'}]}], [{100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi', {100: [{200: 'a'}]}], ['hi',,, {100: [{200: 'a'}]}]));
+    assertTrue(jspb.Message.compareFields(
+        ['hi',,, {100: [{200: 'a'}]}], ['hi', {100: [{200: 'a'}]}]));
+  });
+
+  it('testToMap', function() {
+    var p1 = new proto.jspb.test.Simple1(['k', ['v']]);
+    var p2 = new proto.jspb.test.Simple1(['k1', ['v1', 'v2']]);
+    var soymap = jspb.Message.toMap([p1, p2],
+        proto.jspb.test.Simple1.prototype.getAString,
+        proto.jspb.test.Simple1.prototype.toObject);
+    assertEquals('k', soymap['k'].aString);
+    assertArrayEquals(['v'], soymap['k'].aRepeatedStringList);
+    var protomap = jspb.Message.toMap([p1, p2],
+        proto.jspb.test.Simple1.prototype.getAString);
+    assertEquals('k', protomap['k'].getAString());
+    assertArrayEquals(['v'], protomap['k'].getARepeatedStringList());
+  });
+
+  it('testClone', function() {
+    var supportsUint8Array =
+        !goog.userAgent.IE || goog.userAgent.isVersionOrHigher('10');
+    var original = new proto.jspb.test.TestClone();
+    original.setStr('v1');
+    var simple1 = new proto.jspb.test.Simple1(['x1', ['y1', 'z1']]);
+    var simple2 = new proto.jspb.test.Simple1(['x2', ['y2', 'z2']]);
+    var simple3 = new proto.jspb.test.Simple1(['x3', ['y3', 'z3']]);
+    original.setSimple1(simple1);
+    original.setSimple2List([simple2, simple3]);
+    var bytes1 = supportsUint8Array ? new Uint8Array([1, 2, 3]) : '123';
+    original.setBytesField(bytes1);
+    var extension = new proto.jspb.test.CloneExtension();
+    extension.setExt('e1');
+    original.setExtension(proto.jspb.test.IsExtension.extField, extension);
+    var clone = original.clone();
+    assertArrayEquals(['v1',, ['x1', ['y1', 'z1']],,
+      [['x2', ['y2', 'z2']], ['x3', ['y3', 'z3']]], bytes1,, { 100: [, 'e1'] }],
+        clone.toArray());
+    clone.setStr('v2');
+    var simple4 = new proto.jspb.test.Simple1(['a1', ['b1', 'c1']]);
+    var simple5 = new proto.jspb.test.Simple1(['a2', ['b2', 'c2']]);
+    var simple6 = new proto.jspb.test.Simple1(['a3', ['b3', 'c3']]);
+    clone.setSimple1(simple4);
+    clone.setSimple2List([simple5, simple6]);
+    if (supportsUint8Array) {
+      clone.getBytesField()[0] = 4;
+      assertObjectEquals(bytes1, original.getBytesField());
+    }
+    var bytes2 = supportsUint8Array ? new Uint8Array([4, 5, 6]) : '456';
+    clone.setBytesField(bytes2);
+    var newExtension = new proto.jspb.test.CloneExtension();
+    newExtension.setExt('e2');
+    clone.setExtension(proto.jspb.test.CloneExtension.extField, newExtension);
+    assertArrayEquals(['v2',, ['a1', ['b1', 'c1']],,
+      [['a2', ['b2', 'c2']], ['a3', ['b3', 'c3']]], bytes2,, { 100: [, 'e2'] }],
+        clone.toArray());
+    assertArrayEquals(['v1',, ['x1', ['y1', 'z1']],,
+      [['x2', ['y2', 'z2']], ['x3', ['y3', 'z3']]], bytes1,, { 100: [, 'e1'] }],
+        original.toArray());
+  });
+
+  it('testCopyInto', function() {
+    var supportsUint8Array =
+        !goog.userAgent.IE || goog.userAgent.isVersionOrHigher('10');
+    var original = new proto.jspb.test.TestClone();
+    original.setStr('v1');
+    var dest = new proto.jspb.test.TestClone();
+    dest.setStr('override');
+    var simple1 = new proto.jspb.test.Simple1(['x1', ['y1', 'z1']]);
+    var simple2 = new proto.jspb.test.Simple1(['x2', ['y2', 'z2']]);
+    var simple3 = new proto.jspb.test.Simple1(['x3', ['y3', 'z3']]);
+    var destSimple1 = new proto.jspb.test.Simple1(['ox1', ['oy1', 'oz1']]);
+    var destSimple2 = new proto.jspb.test.Simple1(['ox2', ['oy2', 'oz2']]);
+    var destSimple3 = new proto.jspb.test.Simple1(['ox3', ['oy3', 'oz3']]);
+    original.setSimple1(simple1);
+    original.setSimple2List([simple2, simple3]);
+    dest.setSimple1(destSimple1);
+    dest.setSimple2List([destSimple2, destSimple3]);
+    var bytes1 = supportsUint8Array ? new Uint8Array([1, 2, 3]) : '123';
+    var bytes2 = supportsUint8Array ? new Uint8Array([4, 5, 6]) : '456';
+    original.setBytesField(bytes1);
+    dest.setBytesField(bytes2);
+    var extension = new proto.jspb.test.CloneExtension();
+    extension.setExt('e1');
+    original.setExtension(proto.jspb.test.CloneExtension.extField, extension);
+
+    jspb.Message.copyInto(original, dest);
+    assertArrayEquals(original.toArray(), dest.toArray());
+    assertEquals('x1', dest.getSimple1().getAString());
+    assertEquals('e1',
+        dest.getExtension(proto.jspb.test.CloneExtension.extField).getExt());
+    dest.getSimple1().setAString('new value');
+    assertNotEquals(dest.getSimple1().getAString(),
+        original.getSimple1().getAString());
+    if (supportsUint8Array) {
+      dest.getBytesField()[0] = 7;
+      assertObjectEquals(bytes1, original.getBytesField());
+      assertObjectEquals(new Uint8Array([7, 2, 3]), dest.getBytesField());
+    } else {
+      dest.setBytesField('789');
+      assertObjectEquals(bytes1, original.getBytesField());
+      assertObjectEquals('789', dest.getBytesField());
+    }
+    dest.getExtension(proto.jspb.test.CloneExtension.extField).
+        setExt('new value');
+    assertNotEquals(
+        dest.getExtension(proto.jspb.test.CloneExtension.extField).getExt(),
+        original.getExtension(
+            proto.jspb.test.CloneExtension.extField).getExt());
+  });
+
+  it('testCopyInto_notSameType', function() {
+    var a = new proto.jspb.test.TestClone();
+    var b = new proto.jspb.test.Simple1(['str', ['s1', 's2']]);
+
+    var e = assertThrows(function() {
+      jspb.Message.copyInto(a, b);
+    });
+    assertContains('should have the same type', e.message);
+  });
+
+  it('testExtensions', function() {
+    var extension1 = new proto.jspb.test.IsExtension(['ext1field']);
+    var extension2 = new proto.jspb.test.Simple1(['str', ['s1', 's2']]);
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension1);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple,
+                            extension2);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, 'xyzzy');
+    extendable.setExtension(proto.jspb.test.IndirectExtension.repeatedStrList,
+        ['a', 'b']);
+    var s1 = new proto.jspb.test.Simple1(['foo', ['s1', 's2']]);
+    var s2 = new proto.jspb.test.Simple1(['bar', ['t1', 't2']]);
+    extendable.setExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList,
+        [s1, s2]);
+    assertObjectEquals(extension1,
+        extendable.getExtension(proto.jspb.test.IsExtension.extField));
+    assertObjectEquals(extension2,
+        extendable.getExtension(proto.jspb.test.IndirectExtension.simple));
+    assertObjectEquals('xyzzy',
+        extendable.getExtension(proto.jspb.test.IndirectExtension.str));
+    assertObjectEquals(['a', 'b'], extendable.getExtension(
+        proto.jspb.test.IndirectExtension.repeatedStrList));
+    assertObjectEquals([s1, s2], extendable.getExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList));
+    // Not supported yet, but it should work...
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple, null);
+    assertNull(
+        extendable.getExtension(proto.jspb.test.IndirectExtension.simple));
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, null);
+    assertNull(extendable.getExtension(proto.jspb.test.IndirectExtension.str));
+
+
+    // Extension fields with jspb.ignore = true are ignored.
+    assertUndefined(proto.jspb.test.IndirectExtension['ignored']);
+    assertUndefined(proto.jspb.test.HasExtensions['ignoredFloating']);
+  });
+
+  it('testFloatingExtensions', function() {
+    // From an autogenerated container.
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    var extension = new proto.jspb.test.Simple1(['foo', ['s1', 's2']]);
+    extendable.setExtension(proto.jspb.test.simple1, extension);
+    assertObjectEquals(extension,
+        extendable.getExtension(proto.jspb.test.simple1));
+
+    // From _lib mode.
+    extension = new proto.jspb.test.ExtensionMessage(['s1']);
+    extendable = new proto.jspb.test.TestExtensionsMessage([16]);
+    extendable.setExtension(proto.jspb.test.floatingMsgField, extension);
+    extendable.setExtension(proto.jspb.test.floatingStrField, 's2');
+    assertObjectEquals(extension,
+        extendable.getExtension(proto.jspb.test.floatingMsgField));
+    assertObjectEquals('s2',
+        extendable.getExtension(proto.jspb.test.floatingStrField));
+    assertNotUndefined(proto.jspb.exttest.floatingMsgField);
+    assertNotUndefined(proto.jspb.exttest.floatingMsgFieldTwo);
+    assertNotUndefined(proto.jspb.exttest.beta.floatingStrField);
+  });
+
+  it('testToObject_extendedObject', function() {
+    var extension1 = new proto.jspb.test.IsExtension(['ext1field']);
+    var extension2 = new proto.jspb.test.Simple1(['str', ['s1', 's2'], true]);
+    var extendable = new proto.jspb.test.HasExtensions(['v1', 'v2', 'v3']);
+    extendable.setExtension(proto.jspb.test.IsExtension.extField, extension1);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.simple,
+                            extension2);
+    extendable.setExtension(proto.jspb.test.IndirectExtension.str, 'xyzzy');
+    extendable.setExtension(proto.jspb.test.IndirectExtension.repeatedStrList,
+        ['a', 'b']);
+    var s1 = new proto.jspb.test.Simple1(['foo', ['s1', 's2'], true]);
+    var s2 = new proto.jspb.test.Simple1(['bar', ['t1', 't2'], false]);
+    extendable.setExtension(
+        proto.jspb.test.IndirectExtension.repeatedSimpleList,
+        [s1, s2]);
+    assertObjectEquals({
+      str1: 'v1', str2: 'v2', str3: 'v3',
+      extField: { ext1: 'ext1field' },
+      simple: {
+        aString: 'str', aRepeatedStringList: ['s1', 's2'], aBoolean: true
+      },
+      str: 'xyzzy',
+      repeatedStrList: ['a', 'b'],
+      repeatedSimpleList: [
+        { aString: 'foo', aRepeatedStringList: ['s1', 's2'], aBoolean: true},
+        { aString: 'bar', aRepeatedStringList: ['t1', 't2'], aBoolean: false}
+      ]
+    }, extendable.toObject());
+
+    // Now, with instances included.
+    assertObjectEquals({
+      str1: 'v1', str2: 'v2', str3: 'v3',
+      extField: {
+        ext1: 'ext1field',
+        $jspbMessageInstance:
+            extendable.getExtension(proto.jspb.test.IsExtension.extField)
+      },
+      simple: {
+        aString: 'str',
+        aRepeatedStringList: ['s1', 's2'],
+        aBoolean: true,
+        $jspbMessageInstance:
+            extendable.getExtension(proto.jspb.test.IndirectExtension.simple)
+      },
+      str: 'xyzzy',
+      repeatedStrList: ['a', 'b'],
+      repeatedSimpleList: [{
+        aString: 'foo',
+        aRepeatedStringList: ['s1', 's2'],
+        aBoolean: true,
+        $jspbMessageInstance: s1
+      }, {
+        aString: 'bar',
+        aRepeatedStringList: ['t1', 't2'],
+        aBoolean: false,
+        $jspbMessageInstance: s2
+      }],
+      $jspbMessageInstance: extendable
+    }, extendable.toObject(true /* opt_includeInstance */));
+  });
+
+  it('testInitialization_emptyArray', function() {
+    var msg = new proto.jspb.test.HasExtensions([]);
+    assertArrayEquals([], msg.toArray());
+  });
+
+  it('testInitialization_justExtensionObject', function() {
+    var msg = new proto.jspb.test.Empty([{1: 'hi'}]);
+    // The extensionObject is not moved from its original location.
+    assertArrayEquals([{1: 'hi'}], msg.toArray());
+  });
+
+  it('testInitialization_incompleteList', function() {
+    var msg = new proto.jspb.test.Empty([1, {4: 'hi'}]);
+    // The extensionObject is not moved from its original location.
+    assertArrayEquals([1, {4: 'hi'}], msg.toArray());
+  });
+
+  it('testInitialization_forwardCompatible', function() {
+    var msg = new proto.jspb.test.Empty([1, 2, 3, {1: 'hi'}]);
+    assertArrayEquals([1, 2, 3, {1: 'hi'}], msg.toArray());
+  });
+
+  it('testExtendedMessageEnsureObject',
+     /** @suppress {visibility} */ function() {
+       var data =
+           new proto.jspb.test.HasExtensions(['str1', {'a_key': 'an_object'}]);
+       assertEquals('an_object', data.extensionObject_['a_key']);
+     });
+
+  it('testToObject_hasExtensionField', function() {
+    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1']}]);
+    var obj = data.toObject();
+    assertEquals('str1', obj.str1);
+    assertEquals('ext1', obj.extField.ext1);
+  });
+
+  it('testGetExtension', function() {
+    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1']}]);
+    assertEquals('str1', data.getStr1());
+    var extension = data.getExtension(proto.jspb.test.IsExtension.extField);
+    assertNotNull(extension);
+    assertEquals('ext1', extension.getExt1());
+  });
+
+  it('testSetExtension', function() {
+    var data = new proto.jspb.test.HasExtensions();
+    var extensionMessage = new proto.jspb.test.IsExtension(['is_extension']);
+    data.setExtension(proto.jspb.test.IsExtension.extField, extensionMessage);
+    var obj = data.toObject();
+    assertNotNull(
+        data.getExtension(proto.jspb.test.IsExtension.extField));
+    assertEquals('is_extension', obj.extField.ext1);
+  });
+
+  /**
+   * Note that group is long deprecated, we only support it because JsPb has
+   * a goal of being able to generate JS classes for all proto descriptors.
+   */
+  it('testGroups', function() {
+    var group = new proto.jspb.test.TestGroup();
+    var someGroup = new proto.jspb.test.TestGroup.RepeatedGroup();
+    someGroup.setId('g1');
+    someGroup.setSomeBoolList([true, false]);
+    group.setRepeatedGroupList([someGroup]);
+    var groups = group.getRepeatedGroupList();
+    assertEquals('g1', groups[0].getId());
+    assertObjectEquals([true, false], groups[0].getSomeBoolList());
+    assertObjectEquals({id: 'g1', someBoolList: [true, false]},
+        groups[0].toObject());
+    assertObjectEquals({
+      repeatedGroupList: [{id: 'g1', someBoolList: [true, false]}],
+      requiredGroup: {id: undefined},
+      optionalGroup: undefined,
+      requiredSimple: {aRepeatedStringList: [], aString: undefined},
+      optionalSimple: undefined,
+      id: undefined
+    }, group.toObject());
+    var group1 = new proto.jspb.test.TestGroup1();
+    group1.setGroup(someGroup);
+    assertEquals(someGroup, group1.getGroup());
+  });
+
+  it('testNonExtensionFieldsAfterExtensionRange', function() {
+    var data = [{'1': 'a_string'}];
+    var message = new proto.jspb.test.Complex(data);
+    assertArrayEquals([], message.getARepeatedStringList());
+  });
+
+  it('testReservedGetterNames', function() {
+    var message = new proto.jspb.test.TestReservedNames();
+    message.setExtension$(11);
+    message.setExtension(proto.jspb.test.TestReservedNamesExtension.foo, 12);
+    assertEquals(11, message.getExtension$());
+    assertEquals(12, message.getExtension(
+        proto.jspb.test.TestReservedNamesExtension.foo));
+    assertObjectEquals({extension: 11, foo: 12}, message.toObject());
+  });
+
+  it('testInitializeMessageWithUnsetOneof', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([]);
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.
+            RECURSIVE_ONEOF_NOT_SET,
+        message.getRecursiveOneofCase());
+  });
+
+  it('testInitializeMessageWithSingleValueSetInOneof', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([,, 'x']);
+
+    assertEquals('x', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+  });
+
+  it('testKeepsLastWireValueSetInUnion_multipleValues', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof([,, 'x',, 'y']);
+
+    assertEquals('', message.getPone());
+    assertEquals('y', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PTHREE,
+        message.getPartialOneofCase());
+  });
+
+  it('testSettingOneofFieldClearsOthers', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals('', message.getPone());
+    assertEquals('', message.getPthree());
+    assertFalse(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPone('hi');
+    assertEquals('hi', message.getPone());
+    assertEquals('', message.getPthree());
+    assertTrue(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPthree('bye');
+    assertEquals('', message.getPone());
+    assertEquals('bye', message.getPthree());
+    assertFalse(message.hasPone());
+    assertTrue(message.hasPthree());
+  });
+
+  it('testSettingOneofFieldDoesNotClearFieldsFromOtherUnions', function() {
+    var other = new proto.jspb.test.TestMessageWithOneof;
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals('', message.getPone());
+    assertEquals('', message.getPthree());
+    assertUndefined(message.getRone());
+    assertFalse(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPone('hi');
+    message.setRone(other);
+    assertEquals('hi', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(other, message.getRone());
+    assertTrue(message.hasPone());
+    assertFalse(message.hasPthree());
+
+    message.setPthree('bye');
+    assertEquals('', message.getPone());
+    assertEquals('bye', message.getPthree());
+    assertEquals(other, message.getRone());
+    assertFalse(message.hasPone());
+    assertTrue(message.hasPthree());
+  });
+
+  it('testUnsetsOneofCaseWhenFieldIsCleared', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+
+    message.setPone('hi');
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+
+    message.clearPone();
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.
+            PARTIAL_ONEOF_NOT_SET,
+        message.getPartialOneofCase());
+  });
+
+  it('testMessageWithDefaultOneofValues', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(1234, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase
+            .DEFAULT_ONEOF_A_NOT_SET,
+        message.getDefaultOneofACase());
+
+    message.setAone(567);
+    assertEquals(567, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.AONE,
+        message.getDefaultOneofACase());
+
+    message.setAtwo(890);
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+
+    message.clearAtwo();
+    assertEquals(1234, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase
+            .DEFAULT_ONEOF_A_NOT_SET,
+        message.getDefaultOneofACase());
+  });
+
+  it('testMessageWithDefaultOneofValues_defaultNotOnFirstField', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(0, message.getBone());
+    assertEquals(1234, message.getBtwo());
+    assertFalse(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase
+            .DEFAULT_ONEOF_B_NOT_SET,
+        message.getDefaultOneofBCase());
+
+    message.setBone(2);
+    assertEquals(2, message.getBone());
+    assertEquals(1234, message.getBtwo());
+    assertTrue(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BONE,
+        message.getDefaultOneofBCase());
+
+    message.setBtwo(3);
+    assertEquals(0, message.getBone());
+    assertFalse(message.hasBone());
+    assertTrue(message.hasBtwo());
+    assertEquals(3, message.getBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+        message.getDefaultOneofBCase());
+
+    message.clearBtwo();
+    assertEquals(0, message.getBone());
+    assertFalse(message.hasBone());
+    assertFalse(message.hasBtwo());
+    assertEquals(1234, message.getBtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase
+            .DEFAULT_ONEOF_B_NOT_SET,
+        message.getDefaultOneofBCase());
+  });
+
+  it('testInitializeMessageWithOneofDefaults', function() {
+    var message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(9).concat(567));
+    assertEquals(567, message.getAone());
+    assertEquals(0, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.AONE,
+        message.getDefaultOneofACase());
+
+    message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(10).concat(890));
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+
+    message =
+        new proto.jspb.test.TestMessageWithOneof(new Array(9).concat(567, 890));
+    assertEquals(1234, message.getAone());
+    assertEquals(890, message.getAtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.DefaultOneofACase.ATWO,
+        message.getDefaultOneofACase());
+  });
+
+  it('testInitializeMessageWithOneofDefaults_defaultNotSetOnFirstField',
+      function() {
+        var message;
+
+        message =
+            new proto.jspb.test.TestMessageWithOneof(new Array(11).concat(567));
+        assertEquals(567, message.getBone());
+        assertEquals(1234, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BONE,
+            message.getDefaultOneofBCase());
+
+        message =
+            new proto.jspb.test.TestMessageWithOneof(new Array(12).concat(890));
+        assertEquals(0, message.getBone());
+        assertEquals(890, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+            message.getDefaultOneofBCase());
+
+        message = new proto.jspb.test.TestMessageWithOneof(
+            new Array(11).concat(567, 890));
+        assertEquals(0, message.getBone());
+        assertEquals(890, message.getBtwo());
+        assertEquals(
+            proto.jspb.test.TestMessageWithOneof.DefaultOneofBCase.BTWO,
+            message.getDefaultOneofBCase());
+      });
+
+  it('testOneofContainingAnotherMessage', function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.
+            RECURSIVE_ONEOF_NOT_SET,
+        message.getRecursiveOneofCase());
+
+    var other = new proto.jspb.test.TestMessageWithOneof;
+    message.setRone(other);
+    assertEquals(other, message.getRone());
+    assertEquals('', message.getRtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.RONE,
+        message.getRecursiveOneofCase());
+
+    message.setRtwo('hi');
+    assertUndefined(message.getRone());
+    assertEquals('hi', message.getRtwo());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.RecursiveOneofCase.RTWO,
+        message.getRecursiveOneofCase());
+  });
+
+  it('testQueryingOneofCaseEnsuresOnlyOneFieldIsSetInUnderlyingArray',
+     function() {
+    var message = new proto.jspb.test.TestMessageWithOneof;
+    message.setPone('x');
+    assertEquals('x', message.getPone());
+    assertEquals('', message.getPthree());
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PONE,
+        message.getPartialOneofCase());
+
+    var array = message.toArray();
+    assertEquals('x', array[2]);
+    assertUndefined(array[4]);
+    array[4] = 'y';
+
+    assertEquals(
+        proto.jspb.test.TestMessageWithOneof.PartialOneofCase.PTHREE,
+        message.getPartialOneofCase());
+    assertUndefined(array[2]);
+    assertEquals('y', array[4]);
+  });
+
+  it('testFloatingPointFieldsSupportNan', function() {
+    var assertNan = function(x) {
+      assertTrue('Expected ' + x + ' (' + goog.typeOf(x) + ') to be NaN.',
+          goog.isNumber(x) && isNaN(x));
+    };
+
+    var message = new proto.jspb.test.FloatingPointFields([
+      'NaN', 'NaN', ['NaN', 'NaN'], 'NaN',
+      'NaN', 'NaN', ['NaN', 'NaN'], 'NaN'
+    ]);
+    assertNan(message.getOptionalFloatField());
+    assertNan(message.getRequiredFloatField());
+    assertNan(message.getRepeatedFloatFieldList()[0]);
+    assertNan(message.getRepeatedFloatFieldList()[1]);
+    assertNan(message.getDefaultFloatField());
+    assertNan(message.getOptionalDoubleField());
+    assertNan(message.getRequiredDoubleField());
+    assertNan(message.getRepeatedDoubleFieldList()[0]);
+    assertNan(message.getRepeatedDoubleFieldList()[1]);
+    assertNan(message.getDefaultDoubleField());
+  });
+
+});
diff --git a/js/compatibility_tests/v3.1.0/proto3_test.js b/js/compatibility_tests/v3.1.0/proto3_test.js
new file mode 100644
index 00000000..3c929eff
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/proto3_test.js
@@ -0,0 +1,329 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+goog.require('goog.crypt.base64');
+goog.require('goog.testing.asserts');
+
+// CommonJS-LoadFromFile: testbinary_pb proto.jspb.test
+goog.require('proto.jspb.test.ForeignMessage');
+
+// CommonJS-LoadFromFile: proto3_test_pb proto.jspb.test
+goog.require('proto.jspb.test.Proto3Enum');
+goog.require('proto.jspb.test.TestProto3');
+
+
+var BYTES = new Uint8Array([1, 2, 8, 9]);
+var BYTES_B64 = goog.crypt.base64.encodeByteArray(BYTES);
+
+
+/**
+ * Helper: compare a bytes field to an expected value
+ * @param {Uint8Array|string} arr
+ * @param {Uint8Array} expected
+ * @return {boolean}
+ */
+function bytesCompare(arr, expected) {
+  if (goog.isString(arr)) {
+    arr = goog.crypt.base64.decodeStringToUint8Array(arr);
+  }
+  if (arr.length != expected.length) {
+    return false;
+  }
+  for (var i = 0; i < arr.length; i++) {
+    if (arr[i] != expected[i]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+
+describe('proto3Test', function() {
+  /**
+   * Test defaults for proto3 message fields.
+   */
+  it('testProto3FieldDefaults', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    assertEquals(msg.getOptionalInt32(), 0);
+    assertEquals(msg.getOptionalInt64(), 0);
+    assertEquals(msg.getOptionalUint32(), 0);
+    assertEquals(msg.getOptionalUint64(), 0);
+    assertEquals(msg.getOptionalSint32(), 0);
+    assertEquals(msg.getOptionalSint64(), 0);
+    assertEquals(msg.getOptionalFixed32(), 0);
+    assertEquals(msg.getOptionalFixed64(), 0);
+    assertEquals(msg.getOptionalSfixed32(), 0);
+    assertEquals(msg.getOptionalSfixed64(), 0);
+    assertEquals(msg.getOptionalFloat(), 0);
+    assertEquals(msg.getOptionalDouble(), 0);
+    assertEquals(msg.getOptionalString(), '');
+
+    // TODO(b/26173701): when we change bytes fields default getter to return
+    // Uint8Array, we'll want to switch this assertion to match the u8 case.
+    assertEquals(typeof msg.getOptionalBytes(), 'string');
+    assertEquals(msg.getOptionalBytes_asU8() instanceof Uint8Array, true);
+    assertEquals(typeof msg.getOptionalBytes_asB64(), 'string');
+    assertEquals(msg.getOptionalBytes().length, 0);
+    assertEquals(msg.getOptionalBytes_asU8().length, 0);
+    assertEquals(msg.getOptionalBytes_asB64(), '');
+
+    assertEquals(msg.getOptionalForeignEnum(),
+                 proto.jspb.test.Proto3Enum.PROTO3_FOO);
+    assertEquals(msg.getOptionalForeignMessage(), undefined);
+    assertEquals(msg.getOptionalForeignMessage(), undefined);
+
+    assertEquals(msg.getRepeatedInt32List().length, 0);
+    assertEquals(msg.getRepeatedInt64List().length, 0);
+    assertEquals(msg.getRepeatedUint32List().length, 0);
+    assertEquals(msg.getRepeatedUint64List().length, 0);
+    assertEquals(msg.getRepeatedSint32List().length, 0);
+    assertEquals(msg.getRepeatedSint64List().length, 0);
+    assertEquals(msg.getRepeatedFixed32List().length, 0);
+    assertEquals(msg.getRepeatedFixed64List().length, 0);
+    assertEquals(msg.getRepeatedSfixed32List().length, 0);
+    assertEquals(msg.getRepeatedSfixed64List().length, 0);
+    assertEquals(msg.getRepeatedFloatList().length, 0);
+    assertEquals(msg.getRepeatedDoubleList().length, 0);
+    assertEquals(msg.getRepeatedStringList().length, 0);
+    assertEquals(msg.getRepeatedBytesList().length, 0);
+    assertEquals(msg.getRepeatedForeignEnumList().length, 0);
+    assertEquals(msg.getRepeatedForeignMessageList().length, 0);
+
+  });
+
+
+  /**
+   * Test that all fields can be set and read via a serialization roundtrip.
+   */
+  it('testProto3FieldSetGet', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    msg.setOptionalInt32(-42);
+    msg.setOptionalInt64(-0x7fffffff00000000);
+    msg.setOptionalUint32(0x80000000);
+    msg.setOptionalUint64(0xf000000000000000);
+    msg.setOptionalSint32(-100);
+    msg.setOptionalSint64(-0x8000000000000000);
+    msg.setOptionalFixed32(1234);
+    msg.setOptionalFixed64(0x1234567800000000);
+    msg.setOptionalSfixed32(-1234);
+    msg.setOptionalSfixed64(-0x1234567800000000);
+    msg.setOptionalFloat(1.5);
+    msg.setOptionalDouble(-1.5);
+    msg.setOptionalBool(true);
+    msg.setOptionalString('hello world');
+    msg.setOptionalBytes(BYTES);
+    var submsg = new proto.jspb.test.ForeignMessage();
+    submsg.setC(16);
+    msg.setOptionalForeignMessage(submsg);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_BAR);
+
+    msg.setRepeatedInt32List([-42]);
+    msg.setRepeatedInt64List([-0x7fffffff00000000]);
+    msg.setRepeatedUint32List([0x80000000]);
+    msg.setRepeatedUint64List([0xf000000000000000]);
+    msg.setRepeatedSint32List([-100]);
+    msg.setRepeatedSint64List([-0x8000000000000000]);
+    msg.setRepeatedFixed32List([1234]);
+    msg.setRepeatedFixed64List([0x1234567800000000]);
+    msg.setRepeatedSfixed32List([-1234]);
+    msg.setRepeatedSfixed64List([-0x1234567800000000]);
+    msg.setRepeatedFloatList([1.5]);
+    msg.setRepeatedDoubleList([-1.5]);
+    msg.setRepeatedBoolList([true]);
+    msg.setRepeatedStringList(['hello world']);
+    msg.setRepeatedBytesList([BYTES]);
+    submsg = new proto.jspb.test.ForeignMessage();
+    submsg.setC(1000);
+    msg.setRepeatedForeignMessageList([submsg]);
+    msg.setRepeatedForeignEnumList([proto.jspb.test.Proto3Enum.PROTO3_BAR]);
+
+    msg.setOneofString('asdf');
+
+    var serialized = msg.serializeBinary();
+    msg = proto.jspb.test.TestProto3.deserializeBinary(serialized);
+
+    assertEquals(msg.getOptionalInt32(), -42);
+    assertEquals(msg.getOptionalInt64(), -0x7fffffff00000000);
+    assertEquals(msg.getOptionalUint32(), 0x80000000);
+    assertEquals(msg.getOptionalUint64(), 0xf000000000000000);
+    assertEquals(msg.getOptionalSint32(), -100);
+    assertEquals(msg.getOptionalSint64(), -0x8000000000000000);
+    assertEquals(msg.getOptionalFixed32(), 1234);
+    assertEquals(msg.getOptionalFixed64(), 0x1234567800000000);
+    assertEquals(msg.getOptionalSfixed32(), -1234);
+    assertEquals(msg.getOptionalSfixed64(), -0x1234567800000000);
+    assertEquals(msg.getOptionalFloat(), 1.5);
+    assertEquals(msg.getOptionalDouble(), -1.5);
+    assertEquals(msg.getOptionalBool(), true);
+    assertEquals(msg.getOptionalString(), 'hello world');
+    assertEquals(true, bytesCompare(msg.getOptionalBytes(), BYTES));
+    assertEquals(msg.getOptionalForeignMessage().getC(), 16);
+    assertEquals(msg.getOptionalForeignEnum(),
+        proto.jspb.test.Proto3Enum.PROTO3_BAR);
+
+    assertElementsEquals(msg.getRepeatedInt32List(), [-42]);
+    assertElementsEquals(msg.getRepeatedInt64List(), [-0x7fffffff00000000]);
+    assertElementsEquals(msg.getRepeatedUint32List(), [0x80000000]);
+    assertElementsEquals(msg.getRepeatedUint64List(), [0xf000000000000000]);
+    assertElementsEquals(msg.getRepeatedSint32List(), [-100]);
+    assertElementsEquals(msg.getRepeatedSint64List(), [-0x8000000000000000]);
+    assertElementsEquals(msg.getRepeatedFixed32List(), [1234]);
+    assertElementsEquals(msg.getRepeatedFixed64List(), [0x1234567800000000]);
+    assertElementsEquals(msg.getRepeatedSfixed32List(), [-1234]);
+    assertElementsEquals(msg.getRepeatedSfixed64List(), [-0x1234567800000000]);
+    assertElementsEquals(msg.getRepeatedFloatList(), [1.5]);
+    assertElementsEquals(msg.getRepeatedDoubleList(), [-1.5]);
+    assertElementsEquals(msg.getRepeatedBoolList(), [true]);
+    assertElementsEquals(msg.getRepeatedStringList(), ['hello world']);
+    assertEquals(msg.getRepeatedBytesList().length, 1);
+    assertEquals(true, bytesCompare(msg.getRepeatedBytesList()[0], BYTES));
+    assertEquals(msg.getRepeatedForeignMessageList().length, 1);
+    assertEquals(msg.getRepeatedForeignMessageList()[0].getC(), 1000);
+    assertElementsEquals(msg.getRepeatedForeignEnumList(),
+        [proto.jspb.test.Proto3Enum.PROTO3_BAR]);
+
+    assertEquals(msg.getOneofString(), 'asdf');
+  });
+
+
+  /**
+   * Test that oneofs continue to have a notion of field presence.
+   */
+  it('testOneofs', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofUint32(42);
+    assertEquals(msg.getOneofUint32(), 42);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertTrue(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+
+    var submsg = new proto.jspb.test.ForeignMessage();
+    msg.setOneofForeignMessage(submsg);
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), submsg);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofString('hello');
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), 'hello');
+    assertEquals(msg.getOneofBytes(), '');
+    assertFalse(msg.hasOneofUint32());
+    assertTrue(msg.hasOneofString());
+    assertFalse(msg.hasOneofBytes());
+
+    msg.setOneofBytes(goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    assertEquals(msg.getOneofUint32(), 0);
+    assertEquals(msg.getOneofForeignMessage(), undefined);
+    assertEquals(msg.getOneofString(), '');
+    assertEquals(msg.getOneofBytes_asB64(),
+        goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofString());
+    assertTrue(msg.hasOneofBytes());
+  });
+
+
+  /**
+   * Test that "default"-valued primitive fields are not emitted on the wire.
+   */
+  it('testNoSerializeDefaults', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    // Set each primitive to a non-default value, then back to its default, to
+    // ensure that the serialization is actually checking the value and not just
+    // whether it has ever been set.
+    msg.setOptionalInt32(42);
+    msg.setOptionalInt32(0);
+    msg.setOptionalDouble(3.14);
+    msg.setOptionalDouble(0.0);
+    msg.setOptionalBool(true);
+    msg.setOptionalBool(false);
+    msg.setOptionalString('hello world');
+    msg.setOptionalString('');
+    msg.setOptionalBytes(goog.crypt.base64.encodeString('\u00FF\u00FF'));
+    msg.setOptionalBytes('');
+    msg.setOptionalForeignMessage(new proto.jspb.test.ForeignMessage());
+    msg.setOptionalForeignMessage(null);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_BAR);
+    msg.setOptionalForeignEnum(proto.jspb.test.Proto3Enum.PROTO3_FOO);
+    msg.setOneofUint32(32);
+    msg.clearOneofUint32();
+
+
+    var serialized = msg.serializeBinary();
+    assertEquals(0, serialized.length);
+  });
+
+  /**
+   * Test that base64 string and Uint8Array are interchangeable in bytes fields.
+   */
+  it('testBytesFieldsInterop', function() {
+    var msg = new proto.jspb.test.TestProto3();
+    // Set as a base64 string and check all the getters work.
+    msg.setOptionalBytes(BYTES_B64);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    // Test binary serialize round trip doesn't break it.
+    msg = proto.jspb.test.TestProto3.deserializeBinary(msg.serializeBinary());
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+    msg = new proto.jspb.test.TestProto3();
+    // Set as a Uint8Array and check all the getters work.
+    msg.setOptionalBytes(BYTES);
+    assertTrue(bytesCompare(msg.getOptionalBytes_asU8(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes_asB64(), BYTES));
+    assertTrue(bytesCompare(msg.getOptionalBytes(), BYTES));
+
+  });
+});
diff --git a/js/compatibility_tests/v3.1.0/proto3_test.proto b/js/compatibility_tests/v3.1.0/proto3_test.proto
new file mode 100644
index 00000000..acb67164
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/proto3_test.proto
@@ -0,0 +1,89 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+import "testbinary.proto";
+
+package jspb.test;
+
+message TestProto3 {
+     int32 optional_int32    =  1;
+     int64 optional_int64    =  2;
+    uint32 optional_uint32   =  3;
+    uint64 optional_uint64   =  4;
+    sint32 optional_sint32   =  5;
+    sint64 optional_sint64   =  6;
+   fixed32 optional_fixed32  =  7;
+   fixed64 optional_fixed64  =  8;
+  sfixed32 optional_sfixed32 =  9;
+  sfixed64 optional_sfixed64 = 10;
+     float optional_float    = 11;
+    double optional_double   = 12;
+      bool optional_bool     = 13;
+    string optional_string   = 14;
+     bytes optional_bytes    = 15;
+
+  ForeignMessage optional_foreign_message = 19;
+  Proto3Enum     optional_foreign_enum    = 22;
+
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated ForeignMessage repeated_foreign_message = 49;
+  repeated Proto3Enum     repeated_foreign_enum    = 52;
+
+
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    ForeignMessage oneof_foreign_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+  }
+}
+
+enum Proto3Enum {
+  PROTO3_FOO = 0;
+  PROTO3_BAR = 1;
+  PROTO3_BAZ = 2;
+}
diff --git a/js/compatibility_tests/v3.1.0/test.proto b/js/compatibility_tests/v3.1.0/test.proto
new file mode 100644
index 00000000..48cb37e1
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/test.proto
@@ -0,0 +1,262 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: mwr@google.com (Mark Rawling)
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+import "google/protobuf/descriptor.proto";
+
+package jspb.test;
+
+message Empty {
+}
+
+enum OuterEnum {
+  FOO = 1;
+  BAR = 2;
+}
+
+message EnumContainer {
+  optional OuterEnum outer_enum = 1;
+}
+
+message Simple1 {
+  required string a_string = 1;
+  repeated string a_repeated_string = 2;
+  optional bool a_boolean = 3;
+}
+
+// A message that differs from Simple1 only by name
+message Simple2 {
+  required string a_string = 1;
+  repeated string a_repeated_string = 2;
+}
+
+message SpecialCases {
+  required string normal = 1;
+  // Examples of Js reserved names that are converted to pb_<name>.
+  required string default = 2;
+  required string function = 3;
+  required string var = 4;
+}
+
+message OptionalFields {
+  message Nested {
+    optional int32 an_int = 1;
+  }
+  optional string a_string = 1;
+  required bool a_bool = 2;
+  optional Nested a_nested_message = 3;
+  repeated Nested a_repeated_message = 4;
+  repeated string a_repeated_string = 5;
+}
+
+message HasExtensions {
+  optional string str1 = 1;
+  optional string str2 = 2;
+  optional string str3 = 3;
+  extensions 10 to max;
+}
+
+message Complex {
+  message Nested {
+    required int32 an_int = 2;
+  }
+  required string a_string = 1;
+  required bool an_out_of_order_bool = 9;
+  optional Nested a_nested_message = 4;
+  repeated Nested a_repeated_message = 5;
+  repeated string a_repeated_string = 7;
+}
+
+message OuterMessage {
+  // Make sure this doesn't conflict with the other Complex message.
+  message Complex {
+    optional int32 inner_complex_field = 1;
+  }
+}
+
+message IsExtension {
+  extend HasExtensions {
+    optional IsExtension ext_field = 100;
+  }
+  optional string ext1 = 1;
+
+  // Extensions of proto2 Descriptor messages will be ignored.
+  extend google.protobuf.EnumOptions {
+    optional string simple_option = 42113038;
+  }
+}
+
+message IndirectExtension {
+  extend HasExtensions {
+    optional Simple1 simple = 101;
+    optional string str = 102;
+    repeated string repeated_str = 103;
+    repeated Simple1 repeated_simple = 104;
+  }
+}
+
+extend HasExtensions {
+  optional Simple1 simple1 = 105;
+}
+
+message DefaultValues {
+  enum Enum {
+    E1 = 13;
+    E2 = 77;
+  }
+  optional string string_field = 1 [default="default<>\'\"abc"];
+  optional bool bool_field = 2 [default=true];
+  optional int64 int_field = 3 [default=11];
+  optional Enum enum_field = 4 [default=E1];
+  optional string empty_field = 6 [default=""];
+  optional bytes bytes_field = 8 [default="moo"]; // Base64 encoding is "bW9v"
+}
+
+message FloatingPointFields {
+  optional float optional_float_field = 1;
+  required float required_float_field = 2;
+  repeated float repeated_float_field = 3;
+  optional float default_float_field = 4 [default = 2.0];
+  optional double optional_double_field = 5;
+  required double required_double_field = 6;
+  repeated double repeated_double_field = 7;
+  optional double default_double_field = 8 [default = 2.0];
+}
+
+message TestClone {
+  optional string str = 1;
+  optional Simple1 simple1 = 3;
+  repeated Simple1 simple2 = 5;
+  optional bytes bytes_field = 6;
+  optional string unused = 7;
+  extensions 10 to max;
+}
+
+message CloneExtension {
+  extend TestClone {
+    optional CloneExtension ext_field = 100;
+  }
+  optional string ext = 2;
+}
+
+message TestGroup {
+  repeated group RepeatedGroup = 1 {
+    required string id = 1;
+    repeated bool some_bool = 2;
+  }
+  required group RequiredGroup = 2 {
+    required string id = 1;
+  }
+  optional group OptionalGroup = 3 {
+    required string id = 1;
+  }
+  optional string id = 4;
+  required Simple2 required_simple = 5;
+  optional Simple2 optional_simple = 6;
+}
+
+message TestGroup1 {
+  optional TestGroup.RepeatedGroup group = 1;
+}
+
+message TestReservedNames {
+  optional int32 extension = 1;
+  extensions 10 to max;
+}
+
+message TestReservedNamesExtension {
+  extend TestReservedNames {
+    optional int32 foo = 10;
+  }
+}
+
+message TestMessageWithOneof {
+
+  oneof partial_oneof {
+    string pone = 3;
+    string pthree = 5;
+  }
+
+  oneof recursive_oneof {
+    TestMessageWithOneof rone = 6;
+    string rtwo = 7;
+  }
+
+  optional bool normal_field = 8;
+  repeated string repeated_field = 9;
+
+  oneof default_oneof_a {
+    int32 aone = 10 [default = 1234];
+    int32 atwo = 11;
+  }
+
+  oneof default_oneof_b {
+    int32 bone = 12;
+    int32 btwo = 13 [default = 1234];
+  }
+}
+
+message TestEndsWithBytes {
+  optional int32 value = 1;
+  optional bytes data = 2;
+}
+
+message TestMapFieldsNoBinary {
+  map<string, string> map_string_string = 1;
+  map<string, int32> map_string_int32 = 2;
+  map<string, int64> map_string_int64 = 3;
+  map<string, bool> map_string_bool = 4;
+  map<string, double> map_string_double = 5;
+  map<string, MapValueEnumNoBinary> map_string_enum = 6;
+  map<string, MapValueMessageNoBinary> map_string_msg = 7;
+
+  map<int32, string> map_int32_string = 8;
+  map<int64, string> map_int64_string = 9;
+  map<bool, string> map_bool_string = 10;
+
+  optional TestMapFieldsNoBinary test_map_fields = 11;
+  map<string, TestMapFieldsNoBinary> map_string_testmapfields = 12;
+}
+
+enum MapValueEnumNoBinary {
+  MAP_VALUE_FOO_NOBINARY = 0;
+  MAP_VALUE_BAR_NOBINARY = 1;
+  MAP_VALUE_BAZ_NOBINARY = 2;
+}
+
+message MapValueMessageNoBinary {
+  optional int32 foo = 1;
+}
diff --git a/js/compatibility_tests/v3.1.0/test2.proto b/js/compatibility_tests/v3.1.0/test2.proto
new file mode 100644
index 00000000..44e55eff
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/test2.proto
@@ -0,0 +1,54 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.test;
+
+message TestExtensionsMessage {
+  optional int32 intfield = 1;
+  extensions 100 to max;
+}
+
+message ExtensionMessage {
+  extend TestExtensionsMessage {
+    optional ExtensionMessage ext_field = 100;
+  }
+  optional string ext1 = 1;
+}
+
+// Floating extensions are only supported when generating a _lib.js library.
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field = 101;
+  optional string floating_str_field = 102;
+}
diff --git a/js/compatibility_tests/v3.1.0/test3.proto b/js/compatibility_tests/v3.1.0/test3.proto
new file mode 100644
index 00000000..940a552e
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/test3.proto
@@ -0,0 +1,53 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.exttest;
+
+message TestExtensionsMessage {
+  optional int32 intfield = 1;
+  extensions 100 to max;
+}
+
+message ExtensionMessage {
+  extend TestExtensionsMessage {
+    optional ExtensionMessage ext_field = 100;
+  }
+  optional string ext1 = 1;
+}
+
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field = 101;
+  optional string floating_str_field = 102;
+}
diff --git a/js/compatibility_tests/v3.1.0/test4.proto b/js/compatibility_tests/v3.1.0/test4.proto
new file mode 100644
index 00000000..cf2451e9
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/test4.proto
@@ -0,0 +1,42 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.exttest;
+
+import "test3.proto";
+
+extend TestExtensionsMessage {
+  optional ExtensionMessage floating_msg_field_two = 103;
+}
diff --git a/js/compatibility_tests/v3.1.0/test5.proto b/js/compatibility_tests/v3.1.0/test5.proto
new file mode 100644
index 00000000..34979517
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/test5.proto
@@ -0,0 +1,44 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+option java_package = "com.google.apps.jspb.proto";
+option java_multiple_files = true;
+
+package jspb.exttest.beta;
+
+message TestBetaExtensionsMessage {
+  extensions 100 to max;
+}
+
+extend TestBetaExtensionsMessage {
+  optional string floating_str_field = 101;
+}
diff --git a/js/compatibility_tests/v3.1.0/testbinary.proto b/js/compatibility_tests/v3.1.0/testbinary.proto
new file mode 100644
index 00000000..116f17fb
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/testbinary.proto
@@ -0,0 +1,212 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
+syntax = "proto2";
+
+
+package jspb.test;
+
+// These types are borrowed from `unittest.proto` in the protobuf tree. We want
+// to ensure that the binary-format support will handle all field types
+// properly.
+message TestAllTypes {
+  optional    int32 optional_int32    =  1;
+  optional    int64 optional_int64    =  2;
+  optional   uint32 optional_uint32   =  3;
+  optional   uint64 optional_uint64   =  4;
+  optional   sint32 optional_sint32   =  5;
+  optional   sint64 optional_sint64   =  6;
+  optional  fixed32 optional_fixed32  =  7;
+  optional  fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional    float optional_float    = 11;
+  optional   double optional_double   = 12;
+  optional     bool optional_bool     = 13;
+  optional   string optional_string   = 14;
+  optional    bytes optional_bytes    = 15;
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+
+  optional ForeignMessage                       optional_foreign_message = 19;
+  optional ForeignEnum                          optional_foreign_enum    = 22;
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated group RepeatedGroup = 46 {
+    optional int32 a = 47;
+  }
+
+  repeated ForeignMessage                       repeated_foreign_message = 49;
+  repeated ForeignEnum                          repeated_foreign_enum    = 52;
+
+  // Packed repeated
+  repeated    int32 packed_repeated_int32    = 61 [packed=true];
+  repeated    int64 packed_repeated_int64    = 62 [packed=true];
+  repeated   uint32 packed_repeated_uint32   = 63 [packed=true];
+  repeated   uint64 packed_repeated_uint64   = 64 [packed=true];
+  repeated   sint32 packed_repeated_sint32   = 65 [packed=true];
+  repeated   sint64 packed_repeated_sint64   = 66 [packed=true];
+  repeated  fixed32 packed_repeated_fixed32  = 67 [packed=true];
+  repeated  fixed64 packed_repeated_fixed64  = 68 [packed=true];
+  repeated sfixed32 packed_repeated_sfixed32 = 69 [packed=true];
+  repeated sfixed64 packed_repeated_sfixed64 = 70 [packed=true];
+  repeated    float packed_repeated_float    = 71 [packed=true];
+  repeated   double packed_repeated_double   = 72 [packed=true];
+  repeated     bool packed_repeated_bool     = 73 [packed=true];
+
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    ForeignMessage oneof_foreign_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+  }
+
+}
+
+message ForeignMessage {
+  optional int32 c = 1;
+}
+
+enum ForeignEnum {
+  FOREIGN_FOO = 4;
+  FOREIGN_BAR = 5;
+  FOREIGN_BAZ = 6;
+}
+
+message TestExtendable {
+  extensions 1 to max;
+}
+
+message ExtendsWithMessage {
+  extend TestExtendable {
+    optional ExtendsWithMessage optional_extension = 19;
+    repeated ExtendsWithMessage repeated_extension = 49;
+  }
+  optional int32 foo = 1;
+}
+
+extend TestExtendable {
+  optional    int32 extend_optional_int32    =  1;
+  optional    int64 extend_optional_int64    =  2;
+  optional   uint32 extend_optional_uint32   =  3;
+  optional   uint64 extend_optional_uint64   =  4;
+  optional   sint32 extend_optional_sint32   =  5;
+  optional   sint64 extend_optional_sint64   =  6;
+  optional  fixed32 extend_optional_fixed32  =  7;
+  optional  fixed64 extend_optional_fixed64  =  8;
+  optional sfixed32 extend_optional_sfixed32 =  9;
+  optional sfixed64 extend_optional_sfixed64 = 10;
+  optional    float extend_optional_float    = 11;
+  optional   double extend_optional_double   = 12;
+  optional     bool extend_optional_bool     = 13;
+  optional   string extend_optional_string   = 14;
+  optional    bytes extend_optional_bytes    = 15;
+  optional ForeignEnum extend_optional_foreign_enum    = 22;
+
+  repeated    int32 extend_repeated_int32    = 31;
+  repeated    int64 extend_repeated_int64    = 32;
+  repeated   uint32 extend_repeated_uint32   = 33;
+  repeated   uint64 extend_repeated_uint64   = 34;
+  repeated   sint32 extend_repeated_sint32   = 35;
+  repeated   sint64 extend_repeated_sint64   = 36;
+  repeated  fixed32 extend_repeated_fixed32  = 37;
+  repeated  fixed64 extend_repeated_fixed64  = 38;
+  repeated sfixed32 extend_repeated_sfixed32 = 39;
+  repeated sfixed64 extend_repeated_sfixed64 = 40;
+  repeated    float extend_repeated_float    = 41;
+  repeated   double extend_repeated_double   = 42;
+  repeated     bool extend_repeated_bool     = 43;
+  repeated   string extend_repeated_string   = 44;
+  repeated    bytes extend_repeated_bytes    = 45;
+  repeated ForeignEnum extend_repeated_foreign_enum    = 52;
+
+  repeated    int32 extend_packed_repeated_int32    = 61 [packed=true];
+  repeated    int64 extend_packed_repeated_int64    = 62 [packed=true];
+  repeated   uint32 extend_packed_repeated_uint32   = 63 [packed=true];
+  repeated   uint64 extend_packed_repeated_uint64   = 64 [packed=true];
+  repeated   sint32 extend_packed_repeated_sint32   = 65 [packed=true];
+  repeated   sint64 extend_packed_repeated_sint64   = 66 [packed=true];
+  repeated  fixed32 extend_packed_repeated_fixed32  = 67 [packed=true];
+  repeated  fixed64 extend_packed_repeated_fixed64  = 68 [packed=true];
+  repeated sfixed32 extend_packed_repeated_sfixed32 = 69 [packed=true];
+  repeated sfixed64 extend_packed_repeated_sfixed64 = 70 [packed=true];
+  repeated    float extend_packed_repeated_float    = 71 [packed=true];
+  repeated   double extend_packed_repeated_double   = 72 [packed=true];
+  repeated     bool extend_packed_repeated_bool     = 73 [packed=true];
+  repeated ForeignEnum extend_packed_repeated_foreign_enum    = 82
+      [packed=true];
+
+}
+
+message TestMapFields {
+  map<string, string> map_string_string = 1;
+  map<string, int32> map_string_int32 = 2;
+  map<string, int64> map_string_int64 = 3;
+  map<string, bool> map_string_bool = 4;
+  map<string, double> map_string_double = 5;
+  map<string, MapValueEnum> map_string_enum = 6;
+  map<string, MapValueMessage> map_string_msg = 7;
+
+  map<int32, string> map_int32_string = 8;
+  map<int64, string> map_int64_string = 9;
+  map<bool, string> map_bool_string = 10;
+
+  optional TestMapFields test_map_fields = 11;
+  map<string, TestMapFields> map_string_testmapfields = 12;
+}
+
+enum MapValueEnum {
+  MAP_VALUE_FOO = 0;
+  MAP_VALUE_BAR = 1;
+  MAP_VALUE_BAZ = 2;
+}
+
+message MapValueMessage {
+  optional int32 foo = 1;
+}
diff --git a/js/compatibility_tests/v3.1.0/testempty.proto b/js/compatibility_tests/v3.1.0/testempty.proto
new file mode 100644
index 00000000..960bce4e
--- /dev/null
+++ b/js/compatibility_tests/v3.1.0/testempty.proto
@@ -0,0 +1,34 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+package javatests.com.google.apps.jspb;
+
diff --git a/js/debug.js b/js/debug.js
index 46b24853..ba51bbe0 100644
--- a/js/debug.js
+++ b/js/debug.js
@@ -42,7 +42,7 @@ goog.require('jspb.Message');
 
 /**
  * Turns a proto into a human readable object that can i.e. be written to the
- * console: {@code console.log(jspb.debug.dump(myProto))}.
+ * console: `console.log(jspb.debug.dump(myProto))`.
  * This function makes a best effort and may not work in all cases. It will not
  * work in obfuscated and or optimized code.
  * Use this in environments where {@see jspb.Message.prototype.toObject} is
@@ -74,15 +74,22 @@ jspb.debug.dump = function(message) {
  */
 jspb.debug.dump_ = function(thing) {
   var type = goog.typeOf(thing);
+  var message = thing;  // Copy because we don't want type inference on thing.
   if (type == 'number' || type == 'string' || type == 'boolean' ||
       type == 'null' || type == 'undefined') {
     return thing;
   }
+  if (typeof Uint8Array !== 'undefined') {
+    // Will fail on IE9, where Uint8Array doesn't exist.
+    if (message instanceof Uint8Array) {
+      return thing;
+    }
+  }
+
   if (type == 'array') {
     goog.asserts.assertArray(thing);
     return goog.array.map(thing, jspb.debug.dump_);
   }
-  var message = thing;  // Copy because we don't want type inference on thing.
   goog.asserts.assert(message instanceof jspb.Message,
       'Only messages expected: ' + thing);
   var ctor = message.constructor;
diff --git a/js/debug_test.js b/js/debug_test.js
index 702cc76e..d0d646a5 100644
--- a/js/debug_test.js
+++ b/js/debug_test.js
@@ -41,6 +41,8 @@ goog.require('proto.jspb.test.IsExtension');
 goog.require('proto.jspb.test.Simple1');
 
 
+// CommonJS-LoadFromFile: testbinary_pb
+goog.require('proto.jspb.test.TestAllTypes');
 
 describe('debugTest', function() {
   it('testSimple1', function() {
@@ -74,6 +76,15 @@ describe('debugTest', function() {
     }, jspb.debug.dump(message));
   });
 
+  it('testBytes', function() {
+    if (COMPILED || typeof Uint8Array == 'undefined') {
+      return;
+    }
+    var message = new proto.jspb.test.TestAllTypes();
+    var bytes = new Uint8Array(4);
+    message.setOptionalBytes(bytes);
+    assertEquals(jspb.debug.dump(message)['optionalBytes'], bytes);
+  });
 
   it('testExtensions', function() {
     if (COMPILED) {
diff --git a/js/gulpfile.js b/js/gulpfile.js
index 16c302ed..fc9559f9 100644
--- a/js/gulpfile.js
+++ b/js/gulpfile.js
@@ -23,8 +23,62 @@ var wellKnownTypes = [
   '../src/google/protobuf/wrappers.proto',
 ];
 
-gulp.task('genproto_closure', function (cb) {
-  exec(protoc + ' --js_out=library=testproto_libs,binary:.  -I ../src -I . *.proto && ' + protoc + ' --js_out=one_output_file_per_input_file,binary:. -I ../src -I . ' + wellKnownTypes.join(' '),
+var group1Protos = [
+  'data.proto',
+  'test3.proto',
+  'test5.proto',
+  'commonjs/test6/test6.proto',
+  'test8.proto',
+  'testbinary.proto',
+  'testempty.proto',
+  'test.proto',
+];
+
+var group2Protos = [
+  'proto3_test.proto',
+  'test2.proto',
+  'test4.proto',
+  'commonjs/test7/test7.proto',
+];
+
+gulp.task('genproto_well_known_types_closure', function (cb) {
+  exec(protoc + ' --js_out=one_output_file_per_input_file,binary:. -I ../src -I . ' + wellKnownTypes.join(' '),
+       function (err, stdout, stderr) {
+    console.log(stdout);
+    console.log(stderr);
+    cb(err);
+  });
+});
+
+gulp.task('genproto_group1_closure', function (cb) {
+  exec(protoc + ' --js_out=library=testproto_libs1,binary:.  -I ../src -I . ' + group1Protos.join(' '),
+       function (err, stdout, stderr) {
+    console.log(stdout);
+    console.log(stderr);
+    cb(err);
+  });
+});
+
+gulp.task('genproto_group2_closure', function (cb) {
+  exec(protoc + ' --js_out=library=testproto_libs2,binary:.  -I ../src -I . -I commonjs ' + group2Protos.join(' '),
+       function (err, stdout, stderr) {
+    console.log(stdout);
+    console.log(stderr);
+    cb(err);
+  });
+});
+
+gulp.task('genproto_well_known_types_commonjs', function (cb) {
+  exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src ' + wellKnownTypes.join(' '),
+       function (err, stdout, stderr) {
+    console.log(stdout);
+    console.log(stderr);
+    cb(err);
+  });
+});
+
+gulp.task('genproto_group1_commonjs', function (cb) {
+  exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' + group1Protos.join(' '),
        function (err, stdout, stderr) {
     console.log(stdout);
     console.log(stderr);
@@ -32,8 +86,8 @@ gulp.task('genproto_closure', function (cb) {
   });
 });
 
-gulp.task('genproto_commonjs', function (cb) {
-  exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . *.proto commonjs/test*/*.proto ' + wellKnownTypes.join(' '),
+gulp.task('genproto_group2_commonjs', function (cb) {
+  exec('mkdir -p commonjs_out && ' + protoc + ' --js_out=import_style=commonjs,binary:commonjs_out -I ../src -I commonjs -I . ' + group2Protos.join(' '),
        function (err, stdout, stderr) {
     console.log(stdout);
     console.log(stderr);
@@ -105,7 +159,7 @@ gulp.task('commonjs_testdeps', function (cb) {
   });
 });
 
-gulp.task('make_commonjs_out', ['dist', 'genproto_commonjs', 'genproto_commonjs_wellknowntypes', 'commonjs_asserts', 'commonjs_testdeps'], function (cb) {
+gulp.task('make_commonjs_out', ['dist', 'genproto_well_known_types_commonjs', 'genproto_group1_commonjs', 'genproto_group2_commonjs', 'genproto_commonjs_wellknowntypes', 'commonjs_asserts', 'commonjs_testdeps'], function (cb) {
   // TODO(haberman): minify this more aggressively.
   // Will require proper externs/exports.
   var cmd = "mkdir -p commonjs_out/binary && mkdir -p commonjs_out/test_node_modules && ";
@@ -128,8 +182,8 @@ gulp.task('make_commonjs_out', ['dist', 'genproto_commonjs', 'genproto_commonjs_
   });
 });
 
-gulp.task('deps', ['genproto_closure'], function (cb) {
-  exec('./node_modules/google-closure-library/closure/bin/build/depswriter.py *.js binary/*.js > deps.js',
+gulp.task('deps', ['genproto_well_known_types_closure', 'genproto_group1_closure', 'genproto_group2_closure'], function (cb) {
+  exec('./node_modules/google-closure-library/closure/bin/build/depswriter.py binary/arith.js binary/constants.js binary/decoder.js binary/encoder.js binary/reader.js binary/utils.js binary/writer.js debug.js map.js message.js node_loader.js test_bootstrap.js > deps.js',
        function (err, stdout, stderr) {
     console.log(stdout);
     console.log(stderr);
@@ -137,7 +191,7 @@ gulp.task('deps', ['genproto_closure'], function (cb) {
   });
 });
 
-gulp.task('test_closure', ['genproto_closure', 'deps'], function (cb) {
+gulp.task('test_closure', ['genproto_well_known_types_closure', 'genproto_group1_closure', 'genproto_group2_closure', 'deps'], function (cb) {
   exec('JASMINE_CONFIG_PATH=jasmine.json ./node_modules/.bin/jasmine',
        function (err, stdout, stderr) {
     console.log(stdout);
diff --git a/js/jasmine.json b/js/jasmine.json
index 093f1579..aeea72f8 100644
--- a/js/jasmine.json
+++ b/js/jasmine.json
@@ -10,6 +10,8 @@
         "deps.js",
         "google/protobuf/any.js",
         "google/protobuf/struct.js",
-        "google/protobuf/timestamp.js"
+        "google/protobuf/timestamp.js",
+        "testproto_libs1.js",
+        "testproto_libs2.js"
     ]
 }
diff --git a/js/map.js b/js/map.js
index 4f562dbc..7b5b2c38 100644
--- a/js/map.js
+++ b/js/map.js
@@ -48,9 +48,9 @@ goog.forwardDeclare('jspb.BinaryWriter');
  *
  * @template K, V
  *
- * @param {!Array<!Array<!Object>>} arr
+ * @param {!Array<!Array<?>>} arr
  *
- * @param {?function(new:V)|function(new:V,?)=} opt_valueCtor
+ * @param {?function(new:V, ?=)=} opt_valueCtor
  *    The constructor for type V, if type V is a message type.
  *
  * @constructor
@@ -118,7 +118,7 @@ jspb.Map.prototype.toArray = function() {
     strKeys.sort();
     for (var i = 0; i < strKeys.length; i++) {
       var entry = this.map_[strKeys[i]];
-      var valueWrapper = /** @type {!Object} */ (entry.valueWrapper);
+      var valueWrapper = /** @type {?jspb.Message} */ (entry.valueWrapper);
       if (valueWrapper) {
         valueWrapper.toArray();
       }
@@ -136,7 +136,7 @@ jspb.Map.prototype.toArray = function() {
  *
  * @param {boolean=} includeInstance Whether to include the JSPB instance for
  *    transitional soy proto support: http://goto/soy-param-migration
- * @param {!function((boolean|undefined),!V):!Object=} valueToObject
+ * @param {!function((boolean|undefined),V):!Object=} valueToObject
  *    The static toObject() method, if V is a message type.
  * @return {!Array<!Array<!Object>>}
  */
@@ -146,7 +146,7 @@ jspb.Map.prototype.toObject = function(includeInstance, valueToObject) {
   for (var i = 0; i < rawArray.length; i++) {
     var entry = this.map_[rawArray[i][0].toString()];
     this.wrapEntry_(entry);
-    var valueWrapper = /** @type {!V|undefined} */ (entry.valueWrapper);
+    var valueWrapper = /** @type {V|undefined} */ (entry.valueWrapper);
     if (valueWrapper) {
       goog.asserts.assert(valueToObject);
       entries.push([entry.key, valueToObject(includeInstance, valueWrapper)]);
@@ -165,7 +165,7 @@ jspb.Map.prototype.toObject = function(includeInstance, valueToObject) {
  *
  * @template K, V
  * @param {!Array<!Array<!Object>>} entries
- * @param {!function(new:V)|function(new:V,?)} valueCtor
+ * @param {!function(new:V,?=)} valueCtor
  *    The constructor for type V.
  * @param {!function(!Object):V} valueFromObject
  *    The fromObject function for type V.
@@ -412,8 +412,8 @@ jspb.Map.prototype.has = function(key) {
  * @param {!jspb.BinaryWriter} writer
  * @param {!function(this:jspb.BinaryWriter,number,K)} keyWriterFn
  *     The method on BinaryWriter that writes type K to the stream.
- * @param {!function(this:jspb.BinaryWriter,number,V)|
- *          function(this:jspb.BinaryReader,V,?)} valueWriterFn
+ * @param {!function(this:jspb.BinaryWriter,number,V,?=)|
+ *          function(this:jspb.BinaryWriter,number,V,?)} valueWriterFn
  *     The method on BinaryWriter that writes type V to the stream.  May be
  *     writeMessage, in which case the second callback arg form is used.
  * @param {function(V,!jspb.BinaryWriter)=} opt_valueWriterCallback
@@ -432,7 +432,8 @@ jspb.Map.prototype.serializeBinary = function(
       valueWriterFn.call(writer, 2, this.wrapEntry_(entry),
                          opt_valueWriterCallback);
     } else {
-      valueWriterFn.call(writer, 2, entry.value);
+      /** @type {function(this:jspb.BinaryWriter,number,?)} */ (valueWriterFn)
+          .call(writer, 2, entry.value);
     }
     writer.endSubMessage();
   }
@@ -475,10 +476,13 @@ jspb.Map.deserializeBinary = function(map, reader, keyReaderFn, valueReaderFn,
     } else if (field == 2) {
       // Value.
       if (map.valueCtor_) {
+        goog.asserts.assert(opt_valueReaderCallback);
         value = new map.valueCtor_();
         valueReaderFn.call(reader, value, opt_valueReaderCallback);
       } else {
-        value = valueReaderFn.call(reader);
+        value =
+            (/** @type {function(this:jspb.BinaryReader):?} */ (valueReaderFn))
+                .call(reader);
       }
     }
   }
@@ -509,7 +513,7 @@ jspb.Map.prototype.stringKeys_ = function() {
 
 
 /**
- * @param {!K} key The entry's key.
+ * @param {K} key The entry's key.
  * @param {V=} opt_value The entry's value wrapper.
  * @constructor
  * @struct
diff --git a/js/message.js b/js/message.js
index 05d34e9d..86d18295 100644
--- a/js/message.js
+++ b/js/message.js
@@ -41,7 +41,6 @@ goog.provide('jspb.Message');
 goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.crypt.base64');
-goog.require('goog.json');
 goog.require('jspb.Map');
 
 // Not needed in compilation units that have no protos with xids.
@@ -106,8 +105,9 @@ jspb.ExtensionFieldInfo = function(fieldNumber, fieldName, ctor, toObjectFn,
 /**
  * Stores binary-related information for a single extension field.
  * @param {!jspb.ExtensionFieldInfo<T>} fieldInfo
- * @param {!function(number,?)} binaryReaderFn
- * @param {!function(number,?)|function(number,?,?,?,?,?)} binaryWriterFn
+ * @param {function(this:jspb.BinaryReader,number,?)} binaryReaderFn
+ * @param {function(this:jspb.BinaryWriter,number,?)
+ *        |function(this:jspb.BinaryWriter,number,?,?,?,?,?)} binaryWriterFn
  * @param {function(?,?)=} opt_binaryMessageSerializeFn
  * @param {function(?,?)=} opt_binaryMessageDeserializeFn
  * @param {boolean=} opt_isPacked
@@ -141,6 +141,21 @@ jspb.ExtensionFieldInfo.prototype.isMessageType = function() {
 
 /**
  * Base class for all JsPb messages.
+ *
+ * Several common methods (toObject, serializeBinary, in particular) are not
+ * defined on the prototype to encourage code patterns that minimize code bloat
+ * due to otherwise unused code on all protos contained in the project.
+ *
+ * If you want to call these methods on a generic message, either
+ * pass in your instance of method as a parameter:
+ *     someFunction(instanceOfKnownProto,
+ *                  KnownProtoClass.prototype.serializeBinary);
+ * or use a lambda that knows the type:
+ *     someFunction(()=>instanceOfKnownProto.serializeBinary());
+ * or, if you don't care about code size, just suppress the
+ *     WARNING - Property serializeBinary never defined on jspb.Message
+ * and call it the intuitive way.
+ *
  * @constructor
  * @struct
  */
@@ -176,8 +191,8 @@ goog.define('jspb.Message.GENERATE_FROM_OBJECT', !goog.DISALLOW_TEST_ONLY_CODE);
 
 /**
  * @define {boolean} Whether to generate toString methods for objects. Turn
- *     this off if you do use toString in your project and want to trim it from
- *     compiled JS.
+ *     this off if you do not use toString in your project and want to trim it
+ *     from the compiled JS.
  */
 goog.define('jspb.Message.GENERATE_TO_STRING', true);
 
@@ -190,19 +205,18 @@ goog.define('jspb.Message.GENERATE_TO_STRING', true);
 goog.define('jspb.Message.ASSUME_LOCAL_ARRAYS', false);
 
 
+// TODO(jakubvrana): Turn this off by default.
 /**
- * @define {boolean} Turning on this flag does NOT change the behavior of JSPB
- *     and only affects private internal state. It may, however, break some
- *     tests that use naive deeply-equals algorithms, because using a proto
- *     mutates its internal state.
- *     Projects are advised to turn this flag always on.
+ * @define {boolean} Disabling the serialization of empty trailing fields
+ *     reduces the size of serialized protos. The price is an extra iteration of
+ *     the proto before serialization. This is enabled by default to be
+ *     backwards compatible. Projects are advised to turn this flag always off.
  */
-goog.define('jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS', COMPILED);
-// TODO(b/19419436) Turn this on by default.
+goog.define('jspb.Message.SERIALIZE_EMPTY_TRAILING_FIELDS', true);
 
 
 /**
- * Does this browser support Uint8Aray typed arrays?
+ * Does this JavaScript environment support Uint8Aray typed arrays?
  * @type {boolean}
  * @private
  */
@@ -263,6 +277,13 @@ jspb.Message.prototype.convertedFloatingPointFields_;
 
 
 /**
+ * Repeated fields numbers.
+ * @protected {?Array<number>|undefined}
+ */
+jspb.Message.prototype.repeatedFields;
+
+
+/**
  * The xid of this proto type (The same for all instances of a proto). Provides
  * a way to identify a proto by stable obfuscated name.
  * @see {xid}.
@@ -309,6 +330,18 @@ jspb.Message.getIndex_ = function(msg, fieldNumber) {
 
 
 /**
+ * Returns the tag number based on the index in msg.array.
+ * @param {!jspb.Message} msg Message for which we're calculating an index.
+ * @param {number} index The tag number.
+ * @return {number} The field number.
+ * @private
+ */
+jspb.Message.getFieldNumber_ = function(msg, index) {
+  return index - msg.arrayIndexOffset_;
+};
+
+
+/**
  * Initializes a JsPb Message.
  * @param {!jspb.Message} msg The JsPb proto to modify.
  * @param {Array|undefined} data An initial data array.
@@ -325,7 +358,7 @@ jspb.Message.getIndex_ = function(msg, fieldNumber) {
  */
 jspb.Message.initialize = function(
     msg, data, messageId, suggestedPivot, repeatedFields, opt_oneofFields) {
-  msg.wrappers_ = jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS ? null : {};
+  msg.wrappers_ = null;
   if (!data) {
     data = messageId ? [messageId] : [];
   }
@@ -335,24 +368,27 @@ jspb.Message.initialize = function(
   // which would otherwise go unused.
   msg.arrayIndexOffset_ = messageId === 0 ? -1 : 0;
   msg.array = data;
-  jspb.Message.materializeExtensionObject_(msg, suggestedPivot);
+  jspb.Message.initPivotAndExtensionObject_(msg, suggestedPivot);
   msg.convertedFloatingPointFields_ = {};
 
+  if (!jspb.Message.SERIALIZE_EMPTY_TRAILING_FIELDS) {
+    // TODO(jakubvrana): This is same for all instances, move to prototype.
+    // TODO(jakubvrana): There are indexOf calls on this in serializtion,
+    // consider switching to a set.
+    msg.repeatedFields = repeatedFields;
+  }
+
   if (repeatedFields) {
     for (var i = 0; i < repeatedFields.length; i++) {
       var fieldNumber = repeatedFields[i];
       if (fieldNumber < msg.pivot_) {
         var index = jspb.Message.getIndex_(msg, fieldNumber);
-        msg.array[index] = msg.array[index] ||
-            (jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS ?
-                jspb.Message.EMPTY_LIST_SENTINEL_ :
-                []);
+        msg.array[index] =
+            msg.array[index] || jspb.Message.EMPTY_LIST_SENTINEL_;
       } else {
-        msg.extensionObject_[fieldNumber] =
-            msg.extensionObject_[fieldNumber] ||
-            (jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS ?
-                jspb.Message.EMPTY_LIST_SENTINEL_ :
-                []);
+        jspb.Message.maybeInitEmptyExtensionObject_(msg);
+        msg.extensionObject_[fieldNumber] = msg.extensionObject_[fieldNumber] ||
+            jspb.Message.EMPTY_LIST_SENTINEL_;
       }
     }
   }
@@ -360,8 +396,9 @@ jspb.Message.initialize = function(
   if (opt_oneofFields && opt_oneofFields.length) {
     // Compute the oneof case for each union. This ensures only one value is
     // set in the union.
-    goog.array.forEach(
-        opt_oneofFields, goog.partial(jspb.Message.computeOneofCase, msg));
+    for (var i = 0; i < opt_oneofFields.length; i++) {
+      jspb.Message.computeOneofCase(msg, opt_oneofFields[i]);
+    }
   }
 };
 
@@ -392,17 +429,16 @@ jspb.Message.isArray_ = function(o) {
 
 
 /**
- * Ensures that the array contains an extension object if necessary.
  * If the array contains an extension object in its last position, then the
- * object is kept in place and its position is used as the pivot.  If not, then
- * create an extension object using suggestedPivot.  If suggestedPivot is -1,
- * we don't have an extension object at all, in which case all fields are stored
- * in the array.
+ * object is kept in place and its position is used as the pivot.  If not,
+ * decides the pivot of the message based on suggestedPivot without
+ * materializing the extension object.
+ *
  * @param {!jspb.Message} msg The JsPb proto to modify.
  * @param {number} suggestedPivot See description for initialize().
  * @private
  */
-jspb.Message.materializeExtensionObject_ = function(msg, suggestedPivot) {
+jspb.Message.initPivotAndExtensionObject_ = function(msg, suggestedPivot) {
   if (msg.array.length) {
     var foundIndex = msg.array.length - 1;
     var obj = msg.array[foundIndex];
@@ -413,31 +449,22 @@ jspb.Message.materializeExtensionObject_ = function(msg, suggestedPivot) {
     // in Safari on iOS 8. See the description of CL/86511464 for details.
     if (obj && typeof obj == 'object' && !jspb.Message.isArray_(obj) &&
         !(jspb.Message.SUPPORTS_UINT8ARRAY_ && obj instanceof Uint8Array)) {
-      msg.pivot_ = foundIndex - msg.arrayIndexOffset_;
+      msg.pivot_ = jspb.Message.getFieldNumber_(msg, foundIndex);
       msg.extensionObject_ = obj;
       return;
     }
   }
-  // This complexity exists because we keep all extension fields in the
-  // extensionObject_ regardless of proto field number. Changing this would
-  // simplify the code here, but it would require changing the serialization
-  // format from the server, which is not backwards compatible.
-  // TODO(jshneier): Should we just treat extension fields the same as
-  // non-extension fields, and select whether they appear in the object or in
-  // the array purely based on tag number? This would allow simplifying all the
-  // get/setExtension logic, but it would require the breaking change described
-  // above.
+
   if (suggestedPivot > -1) {
     msg.pivot_ = suggestedPivot;
-    var pivotIndex = jspb.Message.getIndex_(msg, suggestedPivot);
-    if (!jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS) {
-      msg.extensionObject_ = msg.array[pivotIndex] = {};
-    } else {
-      // Initialize to null to avoid changing the shape of the proto when it
-      // gets eventually set.
-      msg.extensionObject_ = null;
-    }
+    // Avoid changing the shape of the proto with an empty extension object by
+    // deferring the materialization of the extension object until the first
+    // time a field set into it (may be due to getting a repeated proto field
+    // from it, in which case a new empty array is set into it at first).
+    msg.extensionObject_ = null;
   } else {
+    // suggestedPivot is -1, which means that we don't have an extension object
+    // at all, in which case all fields are stored in the array.
     msg.pivot_ = Number.MAX_VALUE;
   }
 };
@@ -474,8 +501,7 @@ jspb.Message.toObjectList = function(field, toObjectFn, opt_includeInstance) {
   // And not using it here to avoid a function call.
   var result = [];
   for (var i = 0; i < field.length; i++) {
-    result[i] = toObjectFn.call(field[i], opt_includeInstance,
-      /** @type {!jspb.Message} */ (field[i]));
+    result[i] = toObjectFn.call(field[i], opt_includeInstance, field[i]);
   }
   return result;
 };
@@ -497,7 +523,7 @@ jspb.Message.toObjectExtension = function(proto, obj, extensions,
   for (var fieldNumber in extensions) {
     var fieldInfo = extensions[fieldNumber];
     var value = getExtensionFn.call(proto, fieldInfo);
-    if (value) {
+    if (value != null) {
       for (var name in fieldInfo.fieldName) {
         if (fieldInfo.fieldName.hasOwnProperty(name)) {
           break; // the compiled field name
@@ -508,10 +534,11 @@ jspb.Message.toObjectExtension = function(proto, obj, extensions,
       } else {
         if (fieldInfo.isRepeated) {
           obj[name] = jspb.Message.toObjectList(
-              /** @type {!Array<jspb.Message>} */ (value),
+              /** @type {!Array<!jspb.Message>} */ (value),
               fieldInfo.toObjectFn, opt_includeInstance);
         } else {
-          obj[name] = fieldInfo.toObjectFn(opt_includeInstance, value);
+          obj[name] = fieldInfo.toObjectFn(
+              opt_includeInstance, /** @type {!jspb.Message} */ (value));
         }
       }
     }
@@ -524,7 +551,7 @@ jspb.Message.toObjectExtension = function(proto, obj, extensions,
  * @param {!jspb.Message} proto The proto whose extensions to convert.
  * @param {*} writer The binary-format writer to write to.
  * @param {!Object} extensions The proto class' registered extensions.
- * @param {function(jspb.ExtensionFieldInfo) : *} getExtensionFn The proto
+ * @param {function(this:jspb.Message,!jspb.ExtensionFieldInfo) : *} getExtensionFn The proto
  *     class' getExtension function. Passed for effective dead code removal.
  */
 jspb.Message.serializeBinaryExtensions = function(proto, writer, extensions,
@@ -541,7 +568,7 @@ jspb.Message.serializeBinaryExtensions = function(proto, writer, extensions,
                       'without binary serialization support');
     }
     var value = getExtensionFn.call(proto, fieldInfo);
-    if (value) {
+    if (value != null) {
       if (fieldInfo.isMessageType()) {
         // If the message type of the extension was generated without binary
         // support, there may not be a binary message serializer function, and
@@ -570,10 +597,13 @@ jspb.Message.serializeBinaryExtensions = function(proto, writer, extensions,
  * Reads an extension field from the given reader and, if a valid extension,
  * sets the extension value.
  * @param {!jspb.Message} msg A jspb proto.
- * @param {{skipField:function(),getFieldNumber:function():number}} reader
+ * @param {{
+ *   skipField:function(this:jspb.BinaryReader),
+ *   getFieldNumber:function(this:jspb.BinaryReader):number
+ * }} reader
  * @param {!Object} extensions The extensions object.
- * @param {function(jspb.ExtensionFieldInfo)} getExtensionFn
- * @param {function(jspb.ExtensionFieldInfo, ?)} setExtensionFn
+ * @param {function(this:jspb.Message,!jspb.ExtensionFieldInfo)} getExtensionFn
+ * @param {function(this:jspb.Message,!jspb.ExtensionFieldInfo, ?)} setExtensionFn
  */
 jspb.Message.readBinaryExtension = function(msg, reader, extensions,
     getExtensionFn, setExtensionFn) {
@@ -628,6 +658,9 @@ jspb.Message.getField = function(msg, fieldNumber) {
     }
     return val;
   } else {
+    if (!msg.extensionObject_) {
+      return undefined;
+    }
     var val = msg.extensionObject_[fieldNumber];
     if (val === jspb.Message.EMPTY_LIST_SENTINEL_) {
       return msg.extensionObject_[fieldNumber] = [];
@@ -638,6 +671,32 @@ jspb.Message.getField = function(msg, fieldNumber) {
 
 
 /**
+ * Gets the value of a non-extension repeated field.
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @return {!Array}
+ * The field's value.
+ * @protected
+ */
+jspb.Message.getRepeatedField = function(msg, fieldNumber) {
+  if (fieldNumber < msg.pivot_) {
+    var index = jspb.Message.getIndex_(msg, fieldNumber);
+    var val = msg.array[index];
+    if (val === jspb.Message.EMPTY_LIST_SENTINEL_) {
+      return msg.array[index] = [];
+    }
+    return val;
+  }
+
+  var val = msg.extensionObject_[fieldNumber];
+  if (val === jspb.Message.EMPTY_LIST_SENTINEL_) {
+    return msg.extensionObject_[fieldNumber] = [];
+  }
+  return val;
+};
+
+
+/**
  * Gets the value of an optional float or double field.
  * @param {!jspb.Message} msg A jspb proto.
  * @param {number} fieldNumber The field number.
@@ -659,7 +718,7 @@ jspb.Message.getOptionalFloatingPointField = function(msg, fieldNumber) {
  * @protected
  */
 jspb.Message.getRepeatedFloatingPointField = function(msg, fieldNumber) {
-  var values = jspb.Message.getField(msg, fieldNumber);
+  var values = jspb.Message.getRepeatedField(msg, fieldNumber);
   if (!msg.convertedFloatingPointFields_) {
     msg.convertedFloatingPointFields_ = {};
   }
@@ -845,12 +904,118 @@ jspb.Message.setField = function(msg, fieldNumber, value) {
   if (fieldNumber < msg.pivot_) {
     msg.array[jspb.Message.getIndex_(msg, fieldNumber)] = value;
   } else {
+    jspb.Message.maybeInitEmptyExtensionObject_(msg);
     msg.extensionObject_[fieldNumber] = value;
   }
 };
 
 
 /**
+ * Sets the value of a non-extension integer field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {number} value New value
+ * @protected
+ */
+jspb.Message.setProto3IntField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, 0);
+};
+
+
+/**
+ * Sets the value of a non-extension integer, handled as string, field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {number} value New value
+ * @protected
+ */
+jspb.Message.setProto3StringIntField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, '0');
+};
+
+/**
+ * Sets the value of a non-extension floating point field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {number} value New value
+ * @protected
+ */
+jspb.Message.setProto3FloatField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, 0.0);
+};
+
+
+/**
+ * Sets the value of a non-extension boolean field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {boolean} value New value
+ * @protected
+ */
+jspb.Message.setProto3BooleanField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, false);
+};
+
+
+/**
+ * Sets the value of a non-extension String field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {string} value New value
+ * @protected
+ */
+jspb.Message.setProto3StringField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, "");
+};
+
+
+/**
+ * Sets the value of a non-extension Bytes field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {!Uint8Array|string} value New value
+ * @protected
+ */
+jspb.Message.setProto3BytesField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, "");
+};
+
+
+/**
+ * Sets the value of a non-extension enum field of a proto3
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {number} value New value
+ * @protected
+ */
+jspb.Message.setProto3EnumField = function(msg, fieldNumber, value) {
+  jspb.Message.setFieldIgnoringDefault_(msg, fieldNumber, value, 0);
+};
+
+
+
+/**
+ * Sets the value of a non-extension primitive field, with proto3 (non-nullable
+ * primitives) semantics of ignoring values that are equal to the type's
+ * default.
+ * @template T
+ * @param {!jspb.Message} msg A jspb proto.
+ * @param {number} fieldNumber The field number.
+ * @param {!Uint8Array|string|number|boolean|undefined} value New value
+ * @param {!Uint8Array|string|number|boolean} defaultValue The default value.
+ * @private
+ */
+jspb.Message.setFieldIgnoringDefault_ = function(
+    msg, fieldNumber, value, defaultValue) {
+  if (value != defaultValue) {
+    jspb.Message.setField(msg, fieldNumber, value);
+  } else {
+    msg.array[jspb.Message.getIndex_(msg, fieldNumber)] = null;
+  }
+};
+
+
+/**
  * Adds a value to a repeated, primitive field.
  * @param {!jspb.Message} msg A jspb proto.
  * @param {number} fieldNumber The field number.
@@ -859,7 +1024,7 @@ jspb.Message.setField = function(msg, fieldNumber, value) {
  * @protected
  */
 jspb.Message.addToRepeatedField = function(msg, fieldNumber, value, opt_index) {
-  var arr = jspb.Message.getField(msg, fieldNumber);
+  var arr = jspb.Message.getRepeatedField(msg, fieldNumber);
   if (opt_index != undefined) {
     arr.splice(opt_index, 0, value);
   } else {
@@ -910,14 +1075,15 @@ jspb.Message.computeOneofCase = function(msg, oneof) {
   var oneofField;
   var oneofValue;
 
-  goog.array.forEach(oneof, function(fieldNumber) {
+  for (var i = 0; i < oneof.length; i++) {
+    var fieldNumber = oneof[i];
     var value = jspb.Message.getField(msg, fieldNumber);
-    if (goog.isDefAndNotNull(value)) {
+    if (value != null) {
       oneofField = fieldNumber;
       oneofValue = value;
       jspb.Message.setField(msg, fieldNumber, undefined);
     }
-  });
+  }
 
   if (oneofField) {
     // NB: We know the value is unique, so we can call jspb.Message.setField
@@ -987,7 +1153,7 @@ jspb.Message.wrapRepeatedField_ = function(msg, ctor, fieldNumber) {
     msg.wrappers_ = {};
   }
   if (!msg.wrappers_[fieldNumber]) {
-    var data = jspb.Message.getField(msg, fieldNumber);
+    var data = jspb.Message.getRepeatedField(msg, fieldNumber);
     for (var wrappers = [], i = 0; i < data.length; i++) {
       wrappers[i] = new ctor(data[i]);
     }
@@ -1082,7 +1248,7 @@ jspb.Message.addToRepeatedWrapperField = function(
     wrapperArray = msg.wrappers_[fieldNumber] = [];
   }
   var insertedValue = value ? value : new ctor();
-  var array = jspb.Message.getField(msg, fieldNumber);
+  var array = jspb.Message.getRepeatedField(msg, fieldNumber);
   if (index != undefined) {
     wrapperArray.splice(index, 0, insertedValue);
     array.splice(index, 0, insertedValue.toArray());
@@ -1108,7 +1274,7 @@ jspb.Message.addToRepeatedWrapperField = function(
  *     dead code removal.
  * @param {boolean=} opt_includeInstance Whether to include the JSPB instance
  *     for transitional soy proto support: http://goto/soy-param-migration
- * @return {!Object.<string, Object>} A map of proto or Soy objects.
+ * @return {!Object<string, Object>} A map of proto or Soy objects.
  * @template T
  */
 jspb.Message.toMap = function(
@@ -1185,7 +1351,7 @@ jspb.Message.prototype.toString = function() {
 
 /**
  * Gets the value of the extension field from the extended object.
- * @param {jspb.ExtensionFieldInfo.<T>} fieldInfo Specifies the field to get.
+ * @param {jspb.ExtensionFieldInfo<T>} fieldInfo Specifies the field to get.
  * @return {T} The value of the field.
  * @template T
  */
@@ -1248,7 +1414,7 @@ jspb.Message.prototype.setExtension = function(fieldInfo, value) {
     if (fieldInfo.isMessageType()) {
       self.wrappers_[fieldNumber] = value;
       self.extensionObject_[fieldNumber] = goog.array.map(
-          /** @type {Array<jspb.Message>} */ (value), function(msg) {
+          /** @type {!Array<!jspb.Message>} */ (value), function(msg) {
         return msg.toArray();
       });
     } else {
@@ -1257,7 +1423,8 @@ jspb.Message.prototype.setExtension = function(fieldInfo, value) {
   } else {
     if (fieldInfo.isMessageType()) {
       self.wrappers_[fieldNumber] = value;
-      self.extensionObject_[fieldNumber] = value ? value.toArray() : value;
+      self.extensionObject_[fieldNumber] =
+          value ? /** @type {!jspb.Message} */ (value).toArray() : value;
     } else {
       self.extensionObject_[fieldNumber] = value;
     }
@@ -1359,9 +1526,15 @@ jspb.Message.compareFields = function(field1, field2) {
   // If the fields are trivially equal, they're equal.
   if (field1 == field2) return true;
 
-  // If the fields aren't trivially equal and one of them isn't an object,
-  // they can't possibly be equal.
   if (!goog.isObject(field1) || !goog.isObject(field2)) {
+    // NaN != NaN so we cover this case.
+    if ((goog.isNumber(field1) && isNaN(field1)) ||
+        (goog.isNumber(field2) && isNaN(field2))) {
+      // One of the fields might be a string 'NaN'.
+      return String(field1) == String(field2);
+    }
+    // If the fields aren't trivially equal and one of them isn't an object,
+    // they can't possibly be equal.
     return false;
   }
 
@@ -1384,24 +1557,26 @@ jspb.Message.compareFields = function(field1, field2) {
   // If they're both Arrays, compare them element by element except for the
   // optional extension objects at the end, which we compare separately.
   if (field1.constructor === Array) {
+    var typedField1 = /** @type {!Array<?>} */ (field1);
+    var typedField2 = /** @type {!Array<?>} */ (field2);
     var extension1 = undefined;
     var extension2 = undefined;
 
-    var length = Math.max(field1.length, field2.length);
+    var length = Math.max(typedField1.length, typedField2.length);
     for (var i = 0; i < length; i++) {
-      var val1 = field1[i];
-      var val2 = field2[i];
+      var val1 = typedField1[i];
+      var val2 = typedField2[i];
 
       if (val1 && (val1.constructor == Object)) {
         goog.asserts.assert(extension1 === undefined);
-        goog.asserts.assert(i === field1.length - 1);
+        goog.asserts.assert(i === typedField1.length - 1);
         extension1 = val1;
         val1 = undefined;
       }
 
       if (val2 && (val2.constructor == Object)) {
         goog.asserts.assert(extension2 === undefined);
-        goog.asserts.assert(i === field2.length - 1);
+        goog.asserts.assert(i === typedField2.length - 1);
         extension2 = val2;
         val2 = undefined;
       }
@@ -1524,8 +1699,13 @@ jspb.Message.clone_ = function(obj) {
     var clonedArray = new Array(obj.length);
     // Use array iteration where possible because it is faster than for-in.
     for (var i = 0; i < obj.length; i++) {
-      if ((o = obj[i]) != null) {
-        clonedArray[i] = typeof o == 'object' ? jspb.Message.clone_(o) : o;
+      o = obj[i];
+      if (o != null) {
+        // NOTE:redundant null check existing for NTI compatibility.
+        // see b/70515949
+        clonedArray[i] = (typeof o == 'object') ?
+            jspb.Message.clone_(goog.asserts.assert(o)) :
+            o;
       }
     }
     return clonedArray;
@@ -1535,8 +1715,13 @@ jspb.Message.clone_ = function(obj) {
   }
   var clone = {};
   for (var key in obj) {
-    if ((o = obj[key]) != null) {
-      clone[key] = typeof o == 'object' ? jspb.Message.clone_(o) : o;
+    o = obj[key];
+    if (o != null) {
+      // NOTE:redundant null check existing for NTI compatibility.
+      // see b/70515949
+      clone[key] = (typeof o == 'object') ?
+          jspb.Message.clone_(goog.asserts.assert(o)) :
+          o;
     }
   }
   return clone;
@@ -1552,6 +1737,9 @@ jspb.Message.registerMessageType = function(id, constructor) {
   jspb.Message.registry_[id] = constructor;
   // This is needed so we can later access messageId directly on the contructor,
   // otherwise it is not available due to 'property collapsing' by the compiler.
+  /**
+   * @suppress {strictMissingProperties} messageId is not defined on Function
+   */
   constructor.messageId = id;
 };
 
@@ -1572,7 +1760,11 @@ jspb.Message.registry_ = {};
  * non-MessageSet. We special case MessageSet so that we do not need
  * to goog.require MessageSet from classes that extends MessageSet.
  *
- * @type {!Object.<number, jspb.ExtensionFieldInfo>}
+ * @type {!Object<number, jspb.ExtensionFieldInfo>}
  */
 jspb.Message.messageSetExtensions = {};
+
+/**
+ * @type {!Object<number, jspb.ExtensionFieldBinaryInfo>}
+ */
 jspb.Message.messageSetExtensionsBinary = {};
diff --git a/js/message_test.js b/js/message_test.js
index a2c5763d..1be41093 100644
--- a/js/message_test.js
+++ b/js/message_test.js
@@ -33,6 +33,8 @@
 goog.setTestOnly();
 
 goog.require('goog.json');
+goog.require('goog.string');
+goog.require('goog.testing.PropertyReplacer');
 goog.require('goog.testing.asserts');
 goog.require('goog.userAgent');
 
@@ -40,6 +42,7 @@ goog.require('goog.userAgent');
 goog.require('jspb.Message');
 
 // CommonJS-LoadFromFile: test8_pb proto.jspb.exttest.nested
+goog.require('proto.jspb.exttest.nested.TestNestedExtensionsMessage');
 goog.require('proto.jspb.exttest.nested.TestOuterMessage');
 
 // CommonJS-LoadFromFile: test5_pb proto.jspb.exttest.beta
@@ -82,9 +85,17 @@ goog.require('proto.jspb.test.ExtensionMessage');
 goog.require('proto.jspb.test.TestExtensionsMessage');
 
 
+describe('Message test suite', function() {
+  var stubs = new goog.testing.PropertyReplacer();
 
+  beforeEach(function() {
+    stubs.set(jspb.Message, 'SERIALIZE_EMPTY_TRAILING_FIELDS', false);
+  });
+
+  afterEach(function() {
+    stubs.reset();
+  });
 
-describe('Message test suite', function() {
   it('testEmptyProto', function() {
     var empty1 = new proto.jspb.test.Empty([]);
     var empty2 = new proto.jspb.test.Empty([]);
@@ -272,12 +283,6 @@ describe('Message test suite', function() {
     assertFalse(response.hasEnumField());
   });
 
-  it('testMessageRegistration', /** @suppress {visibility} */ function() {
-    // goog.require(SomeResponse) will include its library, which will in
-    // turn add SomeResponse to the message registry.
-    assertEquals(jspb.Message.registry_['res'], proto.jspb.test.SomeResponse);
-  });
-
   it('testClearFields', function() {
     var data = ['str', true, [11], [[22], [33]], ['s1', 's2']];
     var foo = new proto.jspb.test.OptionalFields(data);
@@ -413,6 +418,18 @@ describe('Message test suite', function() {
         ['hi',,, {100: [{200: 'a'}]}], ['hi', {100: [{200: 'a'}]}]));
   });
 
+  it('testEqualsNonFinite', function() {
+    assertTrue(jspb.Message.compareFields(NaN, NaN));
+    assertTrue(jspb.Message.compareFields(NaN, 'NaN'));
+    assertTrue(jspb.Message.compareFields('NaN', NaN));
+    assertTrue(jspb.Message.compareFields(Infinity, Infinity));
+    assertTrue(jspb.Message.compareFields(Infinity, 'Infinity'));
+    assertTrue(jspb.Message.compareFields('-Infinity', -Infinity));
+    assertTrue(jspb.Message.compareFields([NaN], ['NaN']));
+    assertFalse(jspb.Message.compareFields(undefined, NaN));
+    assertFalse(jspb.Message.compareFields(NaN, undefined));
+  });
+
   it('testToMap', function() {
     var p1 = new proto.jspb.test.Simple1(['k', ['v']]);
     var p2 = new proto.jspb.test.Simple1(['k1', ['v1', 'v2']]);
@@ -660,12 +677,7 @@ describe('Message test suite', function() {
 
   it('testInitialization_emptyArray', function() {
     var msg = new proto.jspb.test.HasExtensions([]);
-    if (jspb.Message.MINIMIZE_MEMORY_ALLOCATIONS) {
-      assertArrayEquals([], msg.toArray());
-    } else {
-      // Extension object is created past all regular fields.
-      assertArrayEquals([,,, {}], msg.toArray());
-    }
+    assertArrayEquals([], msg.toArray());
   });
 
   it('testInitialization_justExtensionObject', function() {
@@ -693,10 +705,11 @@ describe('Message test suite', function() {
      });
 
   it('testToObject_hasExtensionField', function() {
-    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1']}]);
+    var data = new proto.jspb.test.HasExtensions(['str1', {100: ['ext1'], 102: ''}]);
     var obj = data.toObject();
     assertEquals('str1', obj.str1);
     assertEquals('ext1', obj.extField.ext1);
+    assertEquals('', obj.str);
   });
 
   it('testGetExtension', function() {
diff --git a/js/package.json b/js/package.json
index dd6373de..39d99f93 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "google-protobuf",
-  "version": "3.2.0",
+  "version": "3.5.2",
   "description": "Protocol Buffers for JavaScript",
   "main": "google-protobuf.js",
   "files": [
diff --git a/js/proto3_test.js b/js/proto3_test.js
index 81d6de2f..4aed88ba 100644
--- a/js/proto3_test.js
+++ b/js/proto3_test.js
@@ -72,6 +72,37 @@ function bytesCompare(arr, expected) {
 
 
 describe('proto3Test', function() {
+
+  /**
+   * Test default values don't affect equality test.
+   */
+  it('testEqualsProto3', function() {
+    var msg1 = new proto.jspb.test.TestProto3();
+    var msg2 = new proto.jspb.test.TestProto3();
+    msg2.setOptionalString('');
+
+    assertTrue(jspb.Message.equals(msg1, msg2));
+  });
+
+
+  /**
+   * Test setting when a field has default semantics.
+   */
+  it('testSetProto3ToValueAndBackToDefault', function() {
+    var msg = new proto.jspb.test.TestProto3();
+
+    // Setting should work normally.
+    msg.setOptionalString('optionalString');
+    assertEquals(msg.getOptionalString(), 'optionalString');
+
+    // Clearing should work too ...
+    msg.setOptionalString('');
+    assertEquals(msg.getOptionalString(), '');
+
+    // ... and shouldn't affect the equality with a brand new message.
+    assertTrue(jspb.Message.equals(msg, new proto.jspb.test.TestProto3()));
+  });
+
   /**
    * Test defaults for proto3 message fields.
    */
@@ -225,52 +256,65 @@ describe('proto3Test', function() {
    * Test that oneofs continue to have a notion of field presence.
    */
   it('testOneofs', function() {
+    // Default instance.
     var msg = new proto.jspb.test.TestProto3();
-
     assertEquals(msg.getOneofUint32(), 0);
     assertEquals(msg.getOneofForeignMessage(), undefined);
     assertEquals(msg.getOneofString(), '');
     assertEquals(msg.getOneofBytes(), '');
+
     assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofForeignMessage());
     assertFalse(msg.hasOneofString());
     assertFalse(msg.hasOneofBytes());
 
+    // Integer field.
     msg.setOneofUint32(42);
     assertEquals(msg.getOneofUint32(), 42);
     assertEquals(msg.getOneofForeignMessage(), undefined);
     assertEquals(msg.getOneofString(), '');
     assertEquals(msg.getOneofBytes(), '');
+
     assertTrue(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofForeignMessage());
     assertFalse(msg.hasOneofString());
     assertFalse(msg.hasOneofBytes());
 
-
+    // Sub-message field.
     var submsg = new proto.jspb.test.ForeignMessage();
     msg.setOneofForeignMessage(submsg);
     assertEquals(msg.getOneofUint32(), 0);
     assertEquals(msg.getOneofForeignMessage(), submsg);
     assertEquals(msg.getOneofString(), '');
     assertEquals(msg.getOneofBytes(), '');
+
     assertFalse(msg.hasOneofUint32());
+    assertTrue(msg.hasOneofForeignMessage());
     assertFalse(msg.hasOneofString());
     assertFalse(msg.hasOneofBytes());
 
+    // String field.
     msg.setOneofString('hello');
     assertEquals(msg.getOneofUint32(), 0);
     assertEquals(msg.getOneofForeignMessage(), undefined);
     assertEquals(msg.getOneofString(), 'hello');
     assertEquals(msg.getOneofBytes(), '');
+
     assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofForeignMessage());
     assertTrue(msg.hasOneofString());
     assertFalse(msg.hasOneofBytes());
 
+    // Bytes field.
     msg.setOneofBytes(goog.crypt.base64.encodeString('\u00FF\u00FF'));
     assertEquals(msg.getOneofUint32(), 0);
     assertEquals(msg.getOneofForeignMessage(), undefined);
     assertEquals(msg.getOneofString(), '');
     assertEquals(msg.getOneofBytes_asB64(),
         goog.crypt.base64.encodeString('\u00FF\u00FF'));
+
     assertFalse(msg.hasOneofUint32());
+    assertFalse(msg.hasOneofForeignMessage());
     assertFalse(msg.hasOneofString());
     assertTrue(msg.hasOneofBytes());
   });
diff --git a/js/proto3_test.proto b/js/proto3_test.proto
index acb67164..0d073ea0 100644
--- a/js/proto3_test.proto
+++ b/js/proto3_test.proto
@@ -86,4 +86,5 @@ enum Proto3Enum {
   PROTO3_FOO = 0;
   PROTO3_BAR = 1;
   PROTO3_BAZ = 2;
+  MSG_PROTO3_BAH = 3;
 }
diff --git a/js/test.proto b/js/test.proto
index 2be5b8c1..7c881c0d 100644
--- a/js/test.proto
+++ b/js/test.proto
@@ -235,6 +235,13 @@ message TestEndsWithBytes {
 }
 
 
+message Int64Types {
+  optional int64 int64_normal = 1 [jstype=JS_NORMAL];
+  optional sint64 int64_string = 2 [jstype=JS_STRING];
+  optional uint64 int64_number = 3 [jstype=JS_NUMBER];
+
+}
+
 message TestMapFieldsNoBinary {
 
   map<string, string> map_string_string = 1;
@@ -271,3 +278,4 @@ message Deeply {
     }
   }
 }
+
diff --git a/kokoro/README.md b/kokoro/README.md
new file mode 100644
index 00000000..0791c925
--- /dev/null
+++ b/kokoro/README.md
@@ -0,0 +1,6 @@
+
+Kokoro Infrastructure
+----------------------
+
+The files in this directory serve as plumbing for running Protobuf
+tests under Kokoro, our internal CI.
\ No newline at end of file
diff --git a/jenkins/docker32/Dockerfile b/kokoro/linux/32-bit/Dockerfile
index 94d9a4c3..1278889f 100644
--- a/jenkins/docker32/Dockerfile
+++ b/kokoro/linux/32-bit/Dockerfile
@@ -57,36 +57,68 @@ RUN apt-get clean && apt-get update && apt-get install -y --force-yes \
 
 ##################
 # PHP dependencies.
+RUN wget http://am1.php.net/get/php-5.5.38.tar.bz2/from/this/mirror
+RUN mv mirror php-5.5.38.tar.bz2
+RUN tar -xvf php-5.5.38.tar.bz2
+RUN cd php-5.5.38 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.5-zts && \
+    make && make install && make clean && cd ..
+RUN cd php-5.5.38 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.5 && \
+    make && make install && make clean && cd ..
+
+RUN wget http://am1.php.net/get/php-5.6.30.tar.bz2/from/this/mirror
+RUN mv mirror php-5.6.30.tar.bz2
+RUN tar -xvf php-5.6.30.tar.bz2
+RUN cd php-5.6.30 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.6-zts && \
+    make && make install && cd ..
+RUN cd php-5.6.30 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.6 && \
+    make && make install && cd ..
+
+RUN wget http://am1.php.net/get/php-7.0.18.tar.bz2/from/this/mirror
+RUN mv mirror php-7.0.18.tar.bz2
+RUN tar -xvf php-7.0.18.tar.bz2
+RUN cd php-7.0.18 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-7.0-zts && \
+    make && make install && cd ..
+RUN cd php-7.0.18 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-7.0 && \
+    make && make install && cd ..
+
+RUN wget http://am1.php.net/get/php-7.1.4.tar.bz2/from/this/mirror
+RUN mv mirror php-7.1.4.tar.bz2
+RUN tar -xvf php-7.1.4.tar.bz2
+RUN cd php-7.1.4 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-7.1-zts && \
+    make && make install && cd ..
+RUN cd php-7.1.4 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-7.1 && \
+    make && make install && cd ..
+
 RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
 RUN php composer-setup.php
 RUN mv composer.phar /usr/bin/composer
 RUN php -r "unlink('composer-setup.php');"
+RUN composer config -g -- disable-tls true
+RUN composer config -g -- secure-http false
 RUN cd /tmp && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf/php && \
-  git reset 46ae90dc5e145b12fffa7e053a908a9f3e066286 && \
-  ln -sfn /usr/bin/php5.5 /usr/bin/php && \
-  ln -sfn /usr/bin/php-config5.5 /usr/bin/php-config && \
-  ln -sfn /usr/bin/phpize5.5 /usr/bin/phpize && \
+  git reset --hard 49b44bff2b6257a119f9c6a342d6151c736586b8 && \
+  ln -sfn /usr/local/php-5.5/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-5.5/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-5.5/bin/phpize /usr/bin/phpize && \
   composer install && \
   mv vendor /usr/local/vendor-5.5 && \
-  ln -sfn /usr/bin/php5.6 /usr/bin/php && \
-  ln -sfn /usr/bin/php-config5.6 /usr/bin/php-config && \
-  ln -sfn /usr/bin/phpize5.6 /usr/bin/phpize && \
+  ln -sfn /usr/local/php-5.6/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-5.6/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-5.6/bin/phpize /usr/bin/phpize && \
   composer install && \
   mv vendor /usr/local/vendor-5.6 && \
-  ln -sfn /usr/bin/php7.0 /usr/bin/php && \
-  ln -sfn /usr/bin/php-config7.0 /usr/bin/php-config && \
-  ln -sfn /usr/bin/phpize7.0 /usr/bin/phpize && \
+  ln -sfn /usr/local/php-7.0/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-7.0/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-7.0/bin/phpize /usr/bin/phpize && \
   composer install && \
-  mv vendor /usr/local/vendor-7.0
-RUN wget http://am1.php.net/get/php-5.5.38.tar.bz2/from/this/mirror
-RUN mv mirror php-5.5.38.tar.bz2
-RUN tar -xvf php-5.5.38.tar.bz2
-RUN cd php-5.5.38 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.5-zts && \
-    make && make install && make clean && cd ..
-RUN cd php-5.5.38 && ./configure --enable-bcmath --prefix=/usr/local/php-5.5-bc && \
-    make && make install && make clean && cd ..
+  mv vendor /usr/local/vendor-7.0 && \
+  ln -sfn /usr/local/php-7.1/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-7.1/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-7.1/bin/phpize /usr/bin/phpize && \
+  composer install && \
+  mv vendor /usr/local/vendor-7.1
 
 ##################
 # Python dependencies
diff --git a/kokoro/linux/32-bit/build.sh b/kokoro/linux/32-bit/build.sh
new file mode 100755
index 00000000..04383a57
--- /dev/null
+++ b/kokoro/linux/32-bit/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request 32" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/32-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="php_all_32"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/32-bit/continuous.cfg b/kokoro/linux/32-bit/continuous.cfg
new file mode 100644
index 00000000..28b66c07
--- /dev/null
+++ b/kokoro/linux/32-bit/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/32-bit/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/32-bit/presubmit.cfg b/kokoro/linux/32-bit/presubmit.cfg
new file mode 100644
index 00000000..28b66c07
--- /dev/null
+++ b/kokoro/linux/32-bit/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/32-bit/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/jenkins/docker/Dockerfile b/kokoro/linux/64-bit/Dockerfile
index b7583fc7..3a279e66 100644
--- a/jenkins/docker/Dockerfile
+++ b/kokoro/linux/64-bit/Dockerfile
@@ -30,7 +30,7 @@ RUN echo "deb http://ppa.launchpad.net/ondrej/php/ubuntu trusty main" | tee /etc
 # Install dotnet SDK based on https://www.microsoft.com/net/core#debian
 # (Ubuntu instructions need apt to support https)
 RUN apt-get update && apt-get install -y --force-yes curl libunwind8 gettext && \
-  curl -sSL -o dotnet.tar.gz https://go.microsoft.com/fwlink/?LinkID=809130 &&  \
+  curl -sSL -o dotnet.tar.gz https://go.microsoft.com/fwlink/?LinkID=847105 &&  \
   mkdir -p /opt/dotnet && tar zxf dotnet.tar.gz -C /opt/dotnet && \
   ln -s /opt/dotnet/dotnet /usr/local/bin
 
@@ -129,7 +129,7 @@ ENV MVN mvn --batch-mode
 RUN cd /tmp && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf && \
-  git reset bf379715c93b581eeb078cec1f0dd8a7d79df431 && \
+  git reset --hard 129a6e2aca95dcfb6c3e717d7b9cca1f104fde39 && \
   ./autogen.sh && \
   ./configure && \
   make -j4 && \
@@ -145,8 +145,33 @@ RUN mv mirror php-5.5.38.tar.bz2
 RUN tar -xvf php-5.5.38.tar.bz2
 RUN cd php-5.5.38 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.5-zts && \
     make && make install && cd ..
-RUN cd php-5.5.38 && make clean && ./configure --prefix=/usr/local/php-5.5 && \
+RUN cd php-5.5.38 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.5 && \
     make && make install && cd ..
+
+RUN wget http://am1.php.net/get/php-5.6.30.tar.bz2/from/this/mirror
+RUN mv mirror php-5.6.30.tar.bz2
+RUN tar -xvf php-5.6.30.tar.bz2
+RUN cd php-5.6.30 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-5.6-zts && \
+    make && make install && cd ..
+RUN cd php-5.6.30 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-5.6 && \
+    make && make install && cd ..
+
+RUN wget http://am1.php.net/get/php-7.0.18.tar.bz2/from/this/mirror
+RUN mv mirror php-7.0.18.tar.bz2
+RUN tar -xvf php-7.0.18.tar.bz2
+RUN cd php-7.0.18 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-7.0-zts && \
+    make && make install && cd ..
+RUN cd php-7.0.18 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-7.0 && \
+    make && make install && cd ..
+
+RUN wget http://am1.php.net/get/php-7.1.4.tar.bz2/from/this/mirror
+RUN mv mirror php-7.1.4.tar.bz2
+RUN tar -xvf php-7.1.4.tar.bz2
+RUN cd php-7.1.4 && ./configure --enable-maintainer-zts --prefix=/usr/local/php-7.1-zts && \
+    make && make install && cd ..
+RUN cd php-7.1.4 && make clean && ./configure --enable-bcmath --prefix=/usr/local/php-7.1 && \
+    make && make install && cd ..
+
 RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
 RUN php composer-setup.php
 RUN mv composer.phar /usr/bin/composer
@@ -157,23 +182,28 @@ RUN cd /tmp && \
   rm -rf protobuf && \
   git clone https://github.com/google/protobuf.git && \
   cd protobuf && \
-  git reset 46ae90dc5e145b12fffa7e053a908a9f3e066286 && \
+  git reset --hard 49b44bff2b6257a119f9c6a342d6151c736586b8 && \
   cd php && \
   ln -sfn /usr/local/php-5.5/bin/php /usr/bin/php && \
   ln -sfn /usr/local/php-5.5/bin/php-config /usr/bin/php-config && \
   ln -sfn /usr/local/php-5.5/bin/phpize /usr/bin/phpize && \
   composer install && \
   mv vendor /usr/local/vendor-5.5 && \
-  ln -sfn /usr/bin/php5.6 /usr/bin/php && \
-  ln -sfn /usr/bin/php-config5.6 /usr/bin/php-config && \
-  ln -sfn /usr/bin/phpize5.6 /usr/bin/phpize && \
+  ln -sfn /usr/local/php-5.6/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-5.6/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-5.6/bin/phpize /usr/bin/phpize && \
   composer install && \
   mv vendor /usr/local/vendor-5.6 && \
-  ln -sfn /usr/bin/php7.0 /usr/bin/php && \
-  ln -sfn /usr/bin/php-config7.0 /usr/bin/php-config && \
-  ln -sfn /usr/bin/phpize7.0 /usr/bin/phpize && \
+  ln -sfn /usr/local/php-7.0/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-7.0/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-7.0/bin/phpize /usr/bin/phpize && \
   composer install && \
-  mv vendor /usr/local/vendor-7.0
+  mv vendor /usr/local/vendor-7.0 && \
+  ln -sfn /usr/local/php-7.1/bin/php /usr/bin/php && \
+  ln -sfn /usr/local/php-7.1/bin/php-config /usr/bin/php-config && \
+  ln -sfn /usr/local/php-7.1/bin/phpize /usr/bin/phpize && \
+  composer install && \
+  mv vendor /usr/local/vendor-7.1
 
 ##################
 # Go dependencies.
@@ -187,6 +217,13 @@ RUN apt-get install -y \
   # -- For javascript -- \
   npm
 
+##################
+# Python 3.5 3.6 dependencies.
+RUN apt-get clean && apt-get update && apt-get install -y --force-yes \
+  python3.5-dev \
+  python3.6-dev \
+  && apt-get clean
+
 # On Debian/Ubuntu, nodejs binary is named 'nodejs' because the name 'node'
 # is taken by another legacy binary. We don't have that legacy binary and
 # npm expects the binary to be named 'node', so we just create a symbol
diff --git a/jenkins/buildcmds/pull_request.sh b/kokoro/linux/64-bit/build.sh
index 51e4bfa4..48ddbce5 100755
--- a/jenkins/buildcmds/pull_request.sh
+++ b/kokoro/linux/64-bit/build.sh
@@ -1,16 +1,17 @@
 #!/bin/bash
 #
-# This is the top-level script we give to Jenkins as the entry point for
+# This is the top-level script we give to Kokoro as the entry point for
 # running the "pull request" project:
 #
-#   https://grpc-testing.appspot.com/view/Protocol%20Buffers/job/protobuf_pull_request/
-#
 # This script selects a specific Dockerfile (for building a Docker image) and
 # a script to run inside that image.  Then we delegate to the general
 # build_and_run_docker.sh script.
 
-export DOCKERFILE_DIR=jenkins/docker
-export DOCKER_RUN_SCRIPT=jenkins/pull_request_in_docker.sh
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
 export OUTPUT_DIR=testoutput
 export TEST_SET="csharp java_jdk7 javanano_jdk7 java_oracle7 javanano_oracle7 python python_cpp ruby_all javascript golang php_all"
-./jenkins/build_and_run_docker.sh
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/64-bit/continuous.cfg b/kokoro/linux/64-bit/continuous.cfg
new file mode 100644
index 00000000..3a4faac1
--- /dev/null
+++ b/kokoro/linux/64-bit/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/64-bit/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/64-bit/presubmit.cfg b/kokoro/linux/64-bit/presubmit.cfg
new file mode 100644
index 00000000..3a4faac1
--- /dev/null
+++ b/kokoro/linux/64-bit/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/64-bit/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/bazel/build.sh b/kokoro/linux/bazel/build.sh
new file mode 100755
index 00000000..d8aea724
--- /dev/null
+++ b/kokoro/linux/bazel/build.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+git submodule update --init --recursive
+bazel test :protobuf_test
diff --git a/kokoro/linux/bazel/continuous.cfg b/kokoro/linux/bazel/continuous.cfg
new file mode 100644
index 00000000..13cfef15
--- /dev/null
+++ b/kokoro/linux/bazel/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/bazel/build.sh"
+timeout_mins: 15
diff --git a/kokoro/linux/bazel/presubmit.cfg b/kokoro/linux/bazel/presubmit.cfg
new file mode 100644
index 00000000..13cfef15
--- /dev/null
+++ b/kokoro/linux/bazel/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/bazel/build.sh"
+timeout_mins: 15
diff --git a/kokoro/linux/benchmark/build.sh b/kokoro/linux/benchmark/build.sh
new file mode 100755
index 00000000..af5b299e
--- /dev/null
+++ b/kokoro/linux/benchmark/build.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+#
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export OUTPUT_DIR=testoutput
+oldpwd=`pwd`
+
+# tcmalloc
+if [ ! -f gperftools/.libs/libtcmalloc.so ]; then
+  git clone https://github.com/gperftools/gperftools.git
+  cd gperftools
+  ./autogen.sh
+  ./configure
+  make -j8
+  cd ..
+fi
+
+# download datasets for benchmark
+cd benchmarks
+./download_data.sh
+datasets=`find . -type f -name "dataset.*.pb"`
+cd $oldpwd
+
+# build Python protobuf
+./autogen.sh
+./configure CXXFLAGS="-fPIC -O2"
+make -j8
+cd python
+python setup.py build --cpp_implementation
+pip install . --user
+
+
+# build and run Python benchmark
+cd ../benchmarks
+make python-pure-python-benchmark
+make python-cpp-reflection-benchmark
+make -j8 python-cpp-generated-code-benchmark
+echo "[" > tmp/python_result.json
+echo "benchmarking pure python..."
+./python-pure-python-benchmark --json --behavior_prefix="pure-python-benchmark" $datasets  >> tmp/python_result.json
+echo "," >> "tmp/python_result.json"
+echo "benchmarking python cpp reflection..."
+env LD_PRELOAD="$oldpwd/gperftools/.libs/libtcmalloc.so" LD_LIBRARY_PATH="$oldpwd/src/.libs" ./python-cpp-reflection-benchmark --json --behavior_prefix="cpp-reflection-benchmark" $datasets  >> tmp/python_result.json
+echo "," >> "tmp/python_result.json"
+echo "benchmarking python cpp generated code..."
+env LD_PRELOAD="$oldpwd/gperftools/.libs/libtcmalloc.so" LD_LIBRARY_PATH="$oldpwd/src/.libs" ./python-cpp-generated-code-benchmark --json --behavior_prefix="cpp-generated-code-benchmark" $datasets >> tmp/python_result.json
+echo "]" >> "tmp/python_result.json"
+cd $oldpwd
+
+# build CPP protobuf
+./configure
+make clean && make -j8
+
+# build Java protobuf
+cd java
+mvn package
+cd ..
+
+# build CPP benchmark
+cd benchmarks
+mv tmp/python_result.json . && make clean && make -j8 cpp-benchmark && mv python_result.json tmp
+echo "benchmarking cpp..."
+env LD_PRELOAD="$oldpwd/gperftools/.libs/libtcmalloc.so" ./cpp-benchmark --benchmark_min_time=5.0 --benchmark_out_format=json --benchmark_out="tmp/cpp_result.json" $datasets
+cd $oldpwd
+
+# build go protobuf 
+export PATH="`pwd`/src:$PATH"
+export GOPATH="$HOME/gocode"
+mkdir -p "$GOPATH/src/github.com/google"
+rm -f "$GOPATH/src/github.com/google/protobuf"
+ln -s "`pwd`" "$GOPATH/src/github.com/google/protobuf"
+export PATH="$GOPATH/bin:$PATH"
+go get github.com/golang/protobuf/protoc-gen-go
+
+# build go benchmark
+cd benchmarks
+make go-benchmark
+echo "benchmarking go..."
+./go-benchmark $datasets > tmp/go_result.txt
+
+# build java benchmark
+make java-benchmark
+echo "benchmarking java..."
+./java-benchmark -Cresults.file.options.file="tmp/java_result.json" $datasets
+
+# upload result to bq
+make python_add_init
+env LD_LIBRARY_PATH="$oldpwd/src/.libs" python util/run_and_upload.py -cpp="../tmp/cpp_result.json" -java="../tmp/java_result.json" \
+    -python="../tmp/python_result.json" -go="../tmp/go_result.txt"
+
+cd $oldpwd
diff --git a/kokoro/linux/benchmark/continuous.cfg b/kokoro/linux/benchmark/continuous.cfg
new file mode 100755
index 00000000..a3558c65
--- /dev/null
+++ b/kokoro/linux/benchmark/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/benchmark/build.sh"
+timeout_mins: 240 
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/jenkins/build_and_run_docker.sh b/kokoro/linux/build_and_run_docker.sh
index 50e1e8c6..6a1f327a 100755
--- a/jenkins/build_and_run_docker.sh
+++ b/kokoro/linux/build_and_run_docker.sh
@@ -11,15 +11,16 @@
 
 set -ex
 
-cd $(dirname $0)/..
+cd $(dirname $0)/../..
 git_root=$(pwd)
 cd -
 
-# Use image name based on Dockerfile location checksum
-DOCKER_IMAGE_NAME=$(basename $DOCKERFILE_DIR)_$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
+# Use image name based on Dockerfile sha1
+DOCKERHUB_ORGANIZATION=grpctesting/protobuf
+DOCKER_IMAGE_NAME=${DOCKERHUB_ORGANIZATION}_$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
 
-# Make sure docker image has been built. Should be instantaneous if so.
-docker build -t $DOCKER_IMAGE_NAME $DOCKERFILE_DIR
+# Pull dockerimage from Dockerhub
+docker pull $DOCKER_IMAGE_NAME
 
 # Ensure existence of ccache directory
 CCACHE_DIR=/tmp/protobuf-ccache
@@ -28,24 +29,26 @@ mkdir -p $CCACHE_DIR
 # Choose random name for docker container
 CONTAINER_NAME="build_and_run_docker_$(uuidgen)"
 
+echo $git_root
+
 # Run command inside docker
 docker run \
   "$@" \
   -e CCACHE_DIR=$CCACHE_DIR \
-  -e EXTERNAL_GIT_ROOT="/var/local/jenkins/protobuf" \
+  -e EXTERNAL_GIT_ROOT="/var/local/kokoro/protobuf" \
   -e TEST_SET="$TEST_SET" \
   -e THIS_IS_REALLY_NEEDED='see https://github.com/docker/docker/issues/14203 for why docker is awful' \
-  -v "$git_root:/var/local/jenkins/protobuf:ro" \
+  -v "$git_root:/var/local/kokoro/protobuf:ro" \
   -v $CCACHE_DIR:$CCACHE_DIR \
   -w /var/local/git/protobuf \
   --name=$CONTAINER_NAME \
   $DOCKER_IMAGE_NAME \
-  bash -l "/var/local/jenkins/protobuf/$DOCKER_RUN_SCRIPT" || FAILED="true"
+  bash -l "/var/local/kokoro/protobuf/$DOCKER_RUN_SCRIPT" || FAILED="true"
 
 # Copy output artifacts
 if [ "$OUTPUT_DIR" != "" ]
 then
-  docker cp "$CONTAINER_NAME:/var/local/git/protobuf/$OUTPUT_DIR" "$git_root" || FAILED="true"
+  docker cp "$CONTAINER_NAME:/var/local/git/protobuf/$OUTPUT_DIR" "${git_root}/kokoro" || FAILED="true"
 fi
 
 # remove the container, possibly killing it first
diff --git a/kokoro/linux/cpp_distcheck/build.sh b/kokoro/linux/cpp_distcheck/build.sh
new file mode 100755
index 00000000..b8b57e35
--- /dev/null
+++ b/kokoro/linux/cpp_distcheck/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/linux/prepare_build_linux_rc
+
+./tests.sh cpp_distcheck
diff --git a/kokoro/linux/cpp_distcheck/continuous.cfg b/kokoro/linux/cpp_distcheck/continuous.cfg
new file mode 100644
index 00000000..4289f6a7
--- /dev/null
+++ b/kokoro/linux/cpp_distcheck/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/cpp_distcheck/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/cpp_distcheck/presubmit.cfg b/kokoro/linux/cpp_distcheck/presubmit.cfg
new file mode 100644
index 00000000..4289f6a7
--- /dev/null
+++ b/kokoro/linux/cpp_distcheck/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/cpp_distcheck/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/csharp/build.sh b/kokoro/linux/csharp/build.sh
new file mode 100755
index 00000000..de178b84
--- /dev/null
+++ b/kokoro/linux/csharp/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/linux/prepare_build_linux_rc
+
+./tests.sh csharp
diff --git a/kokoro/linux/csharp/continuous.cfg b/kokoro/linux/csharp/continuous.cfg
new file mode 100644
index 00000000..3d177670
--- /dev/null
+++ b/kokoro/linux/csharp/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/csharp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/csharp/presubmit.cfg b/kokoro/linux/csharp/presubmit.cfg
new file mode 100644
index 00000000..3d177670
--- /dev/null
+++ b/kokoro/linux/csharp/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/csharp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/golang/build.sh b/kokoro/linux/golang/build.sh
new file mode 100755
index 00000000..79cddff1
--- /dev/null
+++ b/kokoro/linux/golang/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="golang"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/golang/continuous.cfg b/kokoro/linux/golang/continuous.cfg
new file mode 100644
index 00000000..2282f78f
--- /dev/null
+++ b/kokoro/linux/golang/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/golang/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/golang/presubmit.cfg b/kokoro/linux/golang/presubmit.cfg
new file mode 100644
index 00000000..2282f78f
--- /dev/null
+++ b/kokoro/linux/golang/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/golang/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/java_compatibility/build.sh b/kokoro/linux/java_compatibility/build.sh
new file mode 100755
index 00000000..b1ef2796
--- /dev/null
+++ b/kokoro/linux/java_compatibility/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/linux/prepare_build_linux_rc
+
+./tests.sh java_compatibility
diff --git a/kokoro/linux/java_compatibility/continuous.cfg b/kokoro/linux/java_compatibility/continuous.cfg
new file mode 100644
index 00000000..4897f5c8
--- /dev/null
+++ b/kokoro/linux/java_compatibility/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_compatibility/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/java_compatibility/presubmit.cfg b/kokoro/linux/java_compatibility/presubmit.cfg
new file mode 100644
index 00000000..4897f5c8
--- /dev/null
+++ b/kokoro/linux/java_compatibility/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_compatibility/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/java_jdk7/build.sh b/kokoro/linux/java_jdk7/build.sh
new file mode 100755
index 00000000..0a5604b4
--- /dev/null
+++ b/kokoro/linux/java_jdk7/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="java_jdk7"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/java_jdk7/continuous.cfg b/kokoro/linux/java_jdk7/continuous.cfg
new file mode 100644
index 00000000..07a9df5f
--- /dev/null
+++ b/kokoro/linux/java_jdk7/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_jdk7/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/java_jdk7/presubmit.cfg b/kokoro/linux/java_jdk7/presubmit.cfg
new file mode 100644
index 00000000..07a9df5f
--- /dev/null
+++ b/kokoro/linux/java_jdk7/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_jdk7/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/java_oracle7/build.sh b/kokoro/linux/java_oracle7/build.sh
new file mode 100755
index 00000000..9ab90dad
--- /dev/null
+++ b/kokoro/linux/java_oracle7/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="java_oracle7"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/java_oracle7/continuous.cfg b/kokoro/linux/java_oracle7/continuous.cfg
new file mode 100644
index 00000000..610469b4
--- /dev/null
+++ b/kokoro/linux/java_oracle7/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_oracle7/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/java_oracle7/presubmit.cfg b/kokoro/linux/java_oracle7/presubmit.cfg
new file mode 100644
index 00000000..610469b4
--- /dev/null
+++ b/kokoro/linux/java_oracle7/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_oracle7/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/javascript/build.sh b/kokoro/linux/javascript/build.sh
new file mode 100755
index 00000000..c2585fb7
--- /dev/null
+++ b/kokoro/linux/javascript/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="javascript"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/javascript/continuous.cfg b/kokoro/linux/javascript/continuous.cfg
new file mode 100644
index 00000000..b42f522f
--- /dev/null
+++ b/kokoro/linux/javascript/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/javascript/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/javascript/presubmit.cfg b/kokoro/linux/javascript/presubmit.cfg
new file mode 100644
index 00000000..b42f522f
--- /dev/null
+++ b/kokoro/linux/javascript/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/javascript/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/jenkins/make_test_output.py b/kokoro/linux/make_test_output.py
index b1f2e2c0..98536853 100644
--- a/jenkins/make_test_output.py
+++ b/kokoro/linux/make_test_output.py
@@ -17,11 +17,12 @@ detailed test results.  It runs as the last step before the Jenkins build
 finishes.
 """
 
-import os;
-import sys;
+import os
+import sys
 from yattag import Doc
 from collections import defaultdict
 
+
 def readtests(basedir):
   tests = defaultdict(dict)
 
@@ -68,6 +69,7 @@ def readtests(basedir):
 
   return ret
 
+
 def genxml(tests):
   doc, tag, text = Doc().tagtext()
 
@@ -86,6 +88,7 @@ def genxml(tests):
 
   return doc.getvalue()
 
+
 sys.stderr.write("make_test_output.py: writing XML from directory: " +
-                 sys.argv[1] + "\n");
-print genxml(readtests(sys.argv[1]))
+                 sys.argv[1] + "\n")
+print(genxml(readtests(sys.argv[1])))
diff --git a/kokoro/linux/php_all/build.sh b/kokoro/linux/php_all/build.sh
new file mode 100755
index 00000000..e9ab84cb
--- /dev/null
+++ b/kokoro/linux/php_all/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="php_all"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/php_all/continuous.cfg b/kokoro/linux/php_all/continuous.cfg
new file mode 100644
index 00000000..dfa8037e
--- /dev/null
+++ b/kokoro/linux/php_all/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/php_all/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/php_all/presubmit.cfg b/kokoro/linux/php_all/presubmit.cfg
new file mode 100644
index 00000000..dfa8037e
--- /dev/null
+++ b/kokoro/linux/php_all/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/php_all/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/prepare_build_linux_rc b/kokoro/linux/prepare_build_linux_rc
new file mode 100644
index 00000000..f64ea952
--- /dev/null
+++ b/kokoro/linux/prepare_build_linux_rc
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Source this rc script to prepare the environment for Linux builds
+
+# Set up dotnet
+sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-trusty-prod trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
+sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EB3E94ADBE1229CF
+sudo apt-get update
+# We use the .NET Core SDK 2.x to build...
+sudo apt-get install -y dotnet-sdk-2.0.3
+# But we also need the 1.x framework to test against, as we
+# target netstandard1.x
+sudo apt-get install -y dotnet-sharedframework-microsoft.netcore.app-1.0.5
diff --git a/jenkins/pull_request_in_docker.sh b/kokoro/linux/pull_request_in_docker.sh
index 10daf0a5..df3636cc 100755
--- a/jenkins/pull_request_in_docker.sh
+++ b/kokoro/linux/pull_request_in_docker.sh
@@ -5,7 +5,7 @@
 
 WORKSPACE_BASE=`pwd`
 MY_DIR="$(dirname "$0")"
-TEST_SCRIPT=$MY_DIR/../tests.sh
+TEST_SCRIPT=$MY_DIR/../../tests.sh
 BUILD_DIR=/tmp/protobuf
 
 set -e  # exit immediately on error
@@ -16,9 +16,12 @@ set -x  # display all commands
 rm -rf $BUILD_DIR
 mkdir -p $BUILD_DIR
 cd $BUILD_DIR
-git clone /var/local/jenkins/protobuf
+git clone /var/local/kokoro/protobuf
 cd protobuf
 
+# Initialize any submodules:
+git submodule update --init --recursive
+
 # Set up the directory where our test output is going to go.
 OUTPUT_DIR=`mktemp -d`
 LOG_OUTPUT_DIR=$OUTPUT_DIR/logs
@@ -54,10 +57,10 @@ parallel --results $LOG_OUTPUT_DIR --joblog $OUTPUT_DIR/joblog $TEST_SCRIPT :::
 
 cat $OUTPUT_DIR/joblog
 
-# The directory that is copied from Docker back into the Jenkins workspace.
+# The directory that is copied from Docker back into the Kokoro workspace.
 COPY_FROM_DOCKER=/var/local/git/protobuf/testoutput
 mkdir -p $COPY_FROM_DOCKER
-TESTOUTPUT_XML_FILE=$COPY_FROM_DOCKER/testresults.xml
+TESTOUTPUT_XML_FILE=$COPY_FROM_DOCKER/sponge_log.xml
 
 # Process all the output files from "parallel" and package them into a single
 # .xml file with detailed, broken-down test output.
diff --git a/kokoro/linux/python/build.sh b/kokoro/linux/python/build.sh
new file mode 100755
index 00000000..86964f55
--- /dev/null
+++ b/kokoro/linux/python/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="python"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/python/continuous.cfg b/kokoro/linux/python/continuous.cfg
new file mode 100644
index 00000000..e2fc4136
--- /dev/null
+++ b/kokoro/linux/python/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/python/presubmit.cfg b/kokoro/linux/python/presubmit.cfg
new file mode 100644
index 00000000..e2fc4136
--- /dev/null
+++ b/kokoro/linux/python/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/python_compatibility/build.sh b/kokoro/linux/python_compatibility/build.sh
new file mode 100755
index 00000000..041e65ff
--- /dev/null
+++ b/kokoro/linux/python_compatibility/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/linux/prepare_build_linux_rc
+
+./tests.sh python_compatibility
diff --git a/kokoro/linux/python_compatibility/continuous.cfg b/kokoro/linux/python_compatibility/continuous.cfg
new file mode 100644
index 00000000..4cf6bb07
--- /dev/null
+++ b/kokoro/linux/python_compatibility/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python_compatibility/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/python_compatibility/presubmit.cfg b/kokoro/linux/python_compatibility/presubmit.cfg
new file mode 100644
index 00000000..4cf6bb07
--- /dev/null
+++ b/kokoro/linux/python_compatibility/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python_compatibility/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/linux/python_cpp/build.sh b/kokoro/linux/python_cpp/build.sh
new file mode 100755
index 00000000..add64651
--- /dev/null
+++ b/kokoro/linux/python_cpp/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="python_cpp"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/python_cpp/continuous.cfg b/kokoro/linux/python_cpp/continuous.cfg
new file mode 100644
index 00000000..b1b0e550
--- /dev/null
+++ b/kokoro/linux/python_cpp/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python_cpp/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/python_cpp/presubmit.cfg b/kokoro/linux/python_cpp/presubmit.cfg
new file mode 100644
index 00000000..b1b0e550
--- /dev/null
+++ b/kokoro/linux/python_cpp/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/python_cpp/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/ruby_all/build.sh b/kokoro/linux/ruby_all/build.sh
new file mode 100755
index 00000000..ea758958
--- /dev/null
+++ b/kokoro/linux/ruby_all/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.  Then we delegate to the general
+# build_and_run_docker.sh script.
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+export DOCKERFILE_DIR=kokoro/linux/64-bit
+export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
+export OUTPUT_DIR=testoutput
+export TEST_SET="ruby_all"
+./kokoro/linux/build_and_run_docker.sh
diff --git a/kokoro/linux/ruby_all/continuous.cfg b/kokoro/linux/ruby_all/continuous.cfg
new file mode 100644
index 00000000..02d76437
--- /dev/null
+++ b/kokoro/linux/ruby_all/continuous.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/ruby_all/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/linux/ruby_all/presubmit.cfg b/kokoro/linux/ruby_all/presubmit.cfg
new file mode 100644
index 00000000..02d76437
--- /dev/null
+++ b/kokoro/linux/ruby_all/presubmit.cfg
@@ -0,0 +1,11 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/ruby_all/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}
diff --git a/kokoro/macos/cpp/build.sh b/kokoro/macos/cpp/build.sh
new file mode 100755
index 00000000..bae2ebbc
--- /dev/null
+++ b/kokoro/macos/cpp/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh cpp
diff --git a/kokoro/macos/cpp/continuous.cfg b/kokoro/macos/cpp/continuous.cfg
new file mode 100644
index 00000000..4bea1cbb
--- /dev/null
+++ b/kokoro/macos/cpp/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/cpp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/cpp/presubmit.cfg b/kokoro/macos/cpp/presubmit.cfg
new file mode 100644
index 00000000..4bea1cbb
--- /dev/null
+++ b/kokoro/macos/cpp/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/cpp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/cpp_distcheck/build.sh b/kokoro/macos/cpp_distcheck/build.sh
new file mode 100755
index 00000000..d729b63d
--- /dev/null
+++ b/kokoro/macos/cpp_distcheck/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh cpp_distcheck
diff --git a/kokoro/macos/cpp_distcheck/continuous.cfg b/kokoro/macos/cpp_distcheck/continuous.cfg
new file mode 100644
index 00000000..89441bcc
--- /dev/null
+++ b/kokoro/macos/cpp_distcheck/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/cpp_distcheck/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/cpp_distcheck/presubmit.cfg b/kokoro/macos/cpp_distcheck/presubmit.cfg
new file mode 100644
index 00000000..89441bcc
--- /dev/null
+++ b/kokoro/macos/cpp_distcheck/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/cpp_distcheck/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/javascript/build.sh b/kokoro/macos/javascript/build.sh
new file mode 100755
index 00000000..016832a3
--- /dev/null
+++ b/kokoro/macos/javascript/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh javascript
diff --git a/kokoro/macos/javascript/continuous.cfg b/kokoro/macos/javascript/continuous.cfg
new file mode 100644
index 00000000..b478cc19
--- /dev/null
+++ b/kokoro/macos/javascript/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/javascript/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/javascript/presubmit.cfg b/kokoro/macos/javascript/presubmit.cfg
new file mode 100644
index 00000000..b478cc19
--- /dev/null
+++ b/kokoro/macos/javascript/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/javascript/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_cocoapods_integration/build.sh b/kokoro/macos/objectivec_cocoapods_integration/build.sh
new file mode 100755
index 00000000..f96d2899
--- /dev/null
+++ b/kokoro/macos/objectivec_cocoapods_integration/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh objectivec_cocoapods_integration
diff --git a/kokoro/macos/objectivec_cocoapods_integration/continuous.cfg b/kokoro/macos/objectivec_cocoapods_integration/continuous.cfg
new file mode 100644
index 00000000..952874ed
--- /dev/null
+++ b/kokoro/macos/objectivec_cocoapods_integration/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_cocoapods_integration/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_cocoapods_integration/presubmit.cfg b/kokoro/macos/objectivec_cocoapods_integration/presubmit.cfg
new file mode 100644
index 00000000..952874ed
--- /dev/null
+++ b/kokoro/macos/objectivec_cocoapods_integration/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_cocoapods_integration/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_ios_debug/build.sh b/kokoro/macos/objectivec_ios_debug/build.sh
new file mode 100755
index 00000000..1055d72e
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_debug/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh objectivec_ios_debug
diff --git a/kokoro/macos/objectivec_ios_debug/continuous.cfg b/kokoro/macos/objectivec_ios_debug/continuous.cfg
new file mode 100644
index 00000000..473d5455
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_debug/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_ios_debug/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_ios_debug/presubmit.cfg b/kokoro/macos/objectivec_ios_debug/presubmit.cfg
new file mode 100644
index 00000000..473d5455
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_debug/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_ios_debug/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_ios_release/build.sh b/kokoro/macos/objectivec_ios_release/build.sh
new file mode 100755
index 00000000..76ce3ba0
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_release/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh objectivec_ios_release
diff --git a/kokoro/macos/objectivec_ios_release/continuous.cfg b/kokoro/macos/objectivec_ios_release/continuous.cfg
new file mode 100644
index 00000000..3cbfb685
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_release/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_ios_release/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_ios_release/presubmit.cfg b/kokoro/macos/objectivec_ios_release/presubmit.cfg
new file mode 100644
index 00000000..3cbfb685
--- /dev/null
+++ b/kokoro/macos/objectivec_ios_release/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_ios_release/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_osx/build.sh b/kokoro/macos/objectivec_osx/build.sh
new file mode 100755
index 00000000..000be274
--- /dev/null
+++ b/kokoro/macos/objectivec_osx/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh objectivec_osx
diff --git a/kokoro/macos/objectivec_osx/continuous.cfg b/kokoro/macos/objectivec_osx/continuous.cfg
new file mode 100644
index 00000000..41bd46aa
--- /dev/null
+++ b/kokoro/macos/objectivec_osx/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_osx/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/objectivec_osx/presubmit.cfg b/kokoro/macos/objectivec_osx/presubmit.cfg
new file mode 100644
index 00000000..41bd46aa
--- /dev/null
+++ b/kokoro/macos/objectivec_osx/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/objectivec_osx/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/php5.6_mac/build.sh b/kokoro/macos/php5.6_mac/build.sh
new file mode 100755
index 00000000..74878898
--- /dev/null
+++ b/kokoro/macos/php5.6_mac/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh php5.6_mac
diff --git a/kokoro/macos/php5.6_mac/continuous.cfg b/kokoro/macos/php5.6_mac/continuous.cfg
new file mode 100644
index 00000000..ff345e9f
--- /dev/null
+++ b/kokoro/macos/php5.6_mac/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/php5.6_mac/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/php5.6_mac/presubmit.cfg b/kokoro/macos/php5.6_mac/presubmit.cfg
new file mode 100644
index 00000000..ff345e9f
--- /dev/null
+++ b/kokoro/macos/php5.6_mac/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/php5.6_mac/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/php7.0_mac/build.sh b/kokoro/macos/php7.0_mac/build.sh
new file mode 100755
index 00000000..e5a37e30
--- /dev/null
+++ b/kokoro/macos/php7.0_mac/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh php7.0_mac
diff --git a/kokoro/macos/php7.0_mac/continuous.cfg b/kokoro/macos/php7.0_mac/continuous.cfg
new file mode 100644
index 00000000..c2c18119
--- /dev/null
+++ b/kokoro/macos/php7.0_mac/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/php7.0_mac/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/php7.0_mac/presubmit.cfg b/kokoro/macos/php7.0_mac/presubmit.cfg
new file mode 100644
index 00000000..c2c18119
--- /dev/null
+++ b/kokoro/macos/php7.0_mac/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/php7.0_mac/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/prepare_build_macos_rc b/kokoro/macos/prepare_build_macos_rc
new file mode 100755
index 00000000..fb975523
--- /dev/null
+++ b/kokoro/macos/prepare_build_macos_rc
@@ -0,0 +1,35 @@
+#!/bin/bash
+#
+# This script sets up a Kokoro MacOS worker for running Protobuf tests
+
+##
+# Select Xcode version
+
+export DEVELOPER_DIR=/Applications/Xcode_9.1.app/Contents/Developer
+
+##
+# Select C/C++ compilers
+
+export CC=gcc
+export CXX=g++
+
+##
+# Install Brew and core softwares
+
+ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+source $HOME/.rvm/scripts/rvm
+brew tap homebrew/homebrew-php
+brew uninstall node icu4c
+brew install gflags gpg gpg2 node pcre php56 ruby
+
+##
+# Install Tox
+
+sudo pip install tox==2.4.1
+
+##
+# Install RVM
+
+gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
+command curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
+curl -sSL https://get.rvm.io | bash -s stable --ruby
diff --git a/kokoro/macos/python/build.sh b/kokoro/macos/python/build.sh
new file mode 100755
index 00000000..6b17b954
--- /dev/null
+++ b/kokoro/macos/python/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh python
diff --git a/kokoro/macos/python/continuous.cfg b/kokoro/macos/python/continuous.cfg
new file mode 100644
index 00000000..0fc8b503
--- /dev/null
+++ b/kokoro/macos/python/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/python/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/python/presubmit.cfg b/kokoro/macos/python/presubmit.cfg
new file mode 100644
index 00000000..0fc8b503
--- /dev/null
+++ b/kokoro/macos/python/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/python/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/python_cpp/build.sh b/kokoro/macos/python_cpp/build.sh
new file mode 100755
index 00000000..cb53def9
--- /dev/null
+++ b/kokoro/macos/python_cpp/build.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+g++ --version
+
+./tests.sh python_cpp
diff --git a/kokoro/macos/python_cpp/continuous.cfg b/kokoro/macos/python_cpp/continuous.cfg
new file mode 100644
index 00000000..22f4a0e4
--- /dev/null
+++ b/kokoro/macos/python_cpp/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/python_cpp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/python_cpp/presubmit.cfg b/kokoro/macos/python_cpp/presubmit.cfg
new file mode 100644
index 00000000..22f4a0e4
--- /dev/null
+++ b/kokoro/macos/python_cpp/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/python_cpp/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/ruby21/build.sh b/kokoro/macos/ruby21/build.sh
new file mode 100755
index 00000000..748ea655
--- /dev/null
+++ b/kokoro/macos/ruby21/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh ruby21
diff --git a/kokoro/macos/ruby21/continuous.cfg b/kokoro/macos/ruby21/continuous.cfg
new file mode 100644
index 00000000..489796da
--- /dev/null
+++ b/kokoro/macos/ruby21/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/ruby21/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/ruby21/presubmit.cfg b/kokoro/macos/ruby21/presubmit.cfg
new file mode 100644
index 00000000..489796da
--- /dev/null
+++ b/kokoro/macos/ruby21/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/ruby21/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/ruby22/build.sh b/kokoro/macos/ruby22/build.sh
new file mode 100755
index 00000000..5c4de429
--- /dev/null
+++ b/kokoro/macos/ruby22/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+# Prepare worker environment to run tests
+source kokoro/macos/prepare_build_macos_rc
+
+./tests.sh ruby22
diff --git a/kokoro/macos/ruby22/continuous.cfg b/kokoro/macos/ruby22/continuous.cfg
new file mode 100644
index 00000000..d2705441
--- /dev/null
+++ b/kokoro/macos/ruby22/continuous.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/ruby22/build.sh"
+timeout_mins: 1440
diff --git a/kokoro/macos/ruby22/presubmit.cfg b/kokoro/macos/ruby22/presubmit.cfg
new file mode 100644
index 00000000..d2705441
--- /dev/null
+++ b/kokoro/macos/ruby22/presubmit.cfg
@@ -0,0 +1,5 @@
+# Config file for running tests in Kokoro
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/macos/ruby22/build.sh"
+timeout_mins: 1440
diff --git a/m4/acx_pthread.m4 b/m4/acx_pthread.m4
deleted file mode 100644
index 89d42c74..00000000
--- a/m4/acx_pthread.m4
+++ /dev/null
@@ -1,397 +0,0 @@
-# This was retrieved from
-#    http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
-# See also (perhaps for new versions?)
-#    http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
-#
-# We've rewritten the inconsistency check code (from avahi), to work
-# more broadly.  In particular, it no longer assumes ld accepts -zdefs.
-# This caused a restructing of the code, but the functionality has only
-# changed a little.
-
-dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
-dnl
-dnl @summary figure out how to build C programs using POSIX threads
-dnl
-dnl This macro figures out how to build C programs using POSIX threads.
-dnl It sets the PTHREAD_LIBS output variable to the threads library and
-dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
-dnl C compiler flags that are needed. (The user can also force certain
-dnl compiler flags/libs to be tested by setting these environment
-dnl variables.)
-dnl
-dnl Also sets PTHREAD_CC to any special C compiler that is needed for
-dnl multi-threaded programs (defaults to the value of CC otherwise).
-dnl (This is necessary on AIX to use the special cc_r compiler alias.)
-dnl
-dnl NOTE: You are assumed to not only compile your program with these
-dnl flags, but also link it with them as well. e.g. you should link
-dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
-dnl $LIBS
-dnl
-dnl If you are only building threads programs, you may wish to use
-dnl these variables in your default LIBS, CFLAGS, and CC:
-dnl
-dnl        LIBS="$PTHREAD_LIBS $LIBS"
-dnl        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-dnl        CC="$PTHREAD_CC"
-dnl
-dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
-dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
-dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
-dnl
-dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
-dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
-dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
-dnl default action will define HAVE_PTHREAD.
-dnl
-dnl Please let the authors know if this macro fails on any platform, or
-dnl if you have any other suggestions or comments. This macro was based
-dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
-dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
-dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
-dnl We are also grateful for the helpful feedback of numerous users.
-dnl
-dnl @category InstalledPackages
-dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
-dnl @version 2006-05-29
-dnl @license GPLWithACException
-dnl 
-dnl Checks for GCC shared/pthread inconsistency based on work by
-dnl Marcin Owsiany <marcin@owsiany.pl>
-
-
-AC_DEFUN([ACX_PTHREAD], [
-AC_REQUIRE([AC_CANONICAL_HOST])
-AC_LANG_SAVE
-AC_LANG_C
-acx_pthread_ok=no
-
-# We used to check for pthread.h first, but this fails if pthread.h
-# requires special compiler flags (e.g. on True64 or Sequent).
-# It gets checked for in the link test anyway.
-
-# First of all, check if the user has set any of the PTHREAD_LIBS,
-# etcetera environment variables, and if threads linking works using
-# them:
-if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
-        AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
-        AC_MSG_RESULT($acx_pthread_ok)
-        if test x"$acx_pthread_ok" = xno; then
-                PTHREAD_LIBS=""
-                PTHREAD_CFLAGS=""
-        fi
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
-fi
-
-# We must check for the threads library under a number of different
-# names; the ordering is very important because some systems
-# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
-# libraries is broken (non-POSIX).
-
-# Create a list of thread flags to try.  Items starting with a "-" are
-# C compiler flags, and other items are library names, except for "none"
-# which indicates that we try without any flags at all, and "pthread-config"
-# which is a program returning the flags for the Pth emulation library.
-
-acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
-
-# The ordering *is* (sometimes) important.  Some notes on the
-# individual items follow:
-
-# pthreads: AIX (must check this before -lpthread)
-# none: in case threads are in libc; should be tried before -Kthread and
-#       other compiler flags to prevent continual compiler warnings
-# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
-# -pthreads: Solaris/gcc
-# -mthreads: Mingw32/gcc, Lynx/gcc
-# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-#      doesn't hurt to check since this sometimes defines pthreads too;
-#      also defines -D_REENTRANT)
-#      ... -mt is also the pthreads flag for HP/aCC
-# pthread: Linux, etcetera
-# --thread-safe: KAI C++
-# pthread-config: use pthread-config program (for GNU Pth library)
-
-case "${host_cpu}-${host_os}" in
-        *solaris*)
-
-        # On Solaris (at least, for some versions), libc contains stubbed
-        # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
-        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
-        # a function called by this macro, so we could check for that, but
-        # who knows whether they'll stub that too in a future libc.)  So,
-        # we'll just look for -pthreads and -lpthread first:
-
-        acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
-        ;;
-esac
-
-if test x"$acx_pthread_ok" = xno; then
-for flag in $acx_pthread_flags; do
-
-        case $flag in
-                none)
-                AC_MSG_CHECKING([whether pthreads work without any flags])
-                ;;
-
-                -*)
-                AC_MSG_CHECKING([whether pthreads work with $flag])
-                PTHREAD_CFLAGS="$flag"
-                ;;
-
-		pthread-config)
-		AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
-		if test x"$acx_pthread_config" = xno; then continue; fi
-		PTHREAD_CFLAGS="`pthread-config --cflags`"
-		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
-		;;
-
-                *)
-                AC_MSG_CHECKING([for the pthreads library -l$flag])
-                PTHREAD_LIBS="-l$flag"
-                ;;
-        esac
-
-        save_LIBS="$LIBS"
-        save_CFLAGS="$CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
-        # Check for various functions.  We must include pthread.h,
-        # since some functions may be macros.  (On the Sequent, we
-        # need a special flag -Kthread to make this header compile.)
-        # We check for pthread_join because it is in -lpthread on IRIX
-        # while pthread_create is in libc.  We check for pthread_attr_init
-        # due to DEC craziness with -lpthreads.  We check for
-        # pthread_cleanup_push because it is one of the few pthread
-        # functions on Solaris that doesn't have a non-functional libc stub.
-        # We try pthread_create on general principles.
-        AC_TRY_LINK([#include <pthread.h>],
-                    [pthread_t th; pthread_join(th, 0);
-                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
-                     pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-                    [acx_pthread_ok=yes])
-
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
-
-        AC_MSG_RESULT($acx_pthread_ok)
-        if test "x$acx_pthread_ok" = xyes; then
-                break;
-        fi
-
-        PTHREAD_LIBS=""
-        PTHREAD_CFLAGS=""
-done
-fi
-
-# Various other checks:
-if test "x$acx_pthread_ok" = xyes; then
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
-        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-	AC_MSG_CHECKING([for joinable pthread attribute])
-	attr_name=unknown
-	for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-	    AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
-                        [attr_name=$attr; break])
-	done
-        AC_MSG_RESULT($attr_name)
-        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
-            AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
-                               [Define to necessary symbol if this constant
-                                uses a non-standard name on your system.])
-        fi
-
-        AC_MSG_CHECKING([if more special flags are required for pthreads])
-        flag=no
-        case "${host_cpu}-${host_os}" in
-            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
-            *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
-        esac
-        AC_MSG_RESULT(${flag})
-        if test "x$flag" != xno; then
-            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
-        fi
-
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
-        # More AIX lossage: must compile with xlc_r or cc_r
-	if test x"$GCC" != xyes; then
-          AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
-        else
-          PTHREAD_CC=$CC
-	fi
-
-	# The next part tries to detect GCC inconsistency with -shared on some
-	# architectures and systems. The problem is that in certain
-	# configurations, when -shared is specified, GCC "forgets" to
-	# internally use various flags which are still necessary.
-	
-	#
-	# Prepare the flags
-	#
-	save_CFLAGS="$CFLAGS"
-	save_LIBS="$LIBS"
-	save_CC="$CC"
-	
-	# Try with the flags determined by the earlier checks.
-	#
-	# -Wl,-z,defs forces link-time symbol resolution, so that the
-	# linking checks with -shared actually have any value
-	#
-	# FIXME: -fPIC is required for -shared on many architectures,
-	# so we specify it here, but the right way would probably be to
-	# properly detect whether it is actually required.
-	CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
-	LIBS="$PTHREAD_LIBS $LIBS"
-	CC="$PTHREAD_CC"
-	
-	# In order not to create several levels of indentation, we test
-	# the value of "$done" until we find the cure or run out of ideas.
-	done="no"
-	
-	# First, make sure the CFLAGS we added are actually accepted by our
-	# compiler.  If not (and OS X's ld, for instance, does not accept -z),
-	# then we can't do this test.
-	if test x"$done" = xno; then
-	   AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
-	   AC_TRY_LINK(,, , [done=yes])
-	
-	   if test "x$done" = xyes ; then
-	      AC_MSG_RESULT([no])
-	   else
-	      AC_MSG_RESULT([yes])
-	   fi
-	fi
-	
-	if test x"$done" = xno; then
-	   AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
-	   AC_TRY_LINK([#include <pthread.h>],
-	      [pthread_t th; pthread_join(th, 0);
-	      pthread_attr_init(0); pthread_cleanup_push(0, 0);
-	      pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-	      [done=yes])
-	   
-	   if test "x$done" = xyes; then
-	      AC_MSG_RESULT([yes])
-	   else
-	      AC_MSG_RESULT([no])
-	   fi
-	fi
-	
-	#
-	# Linux gcc on some architectures such as mips/mipsel forgets
-	# about -lpthread
-	#
-	if test x"$done" = xno; then
-	   AC_MSG_CHECKING([whether -lpthread fixes that])
-	   LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
-	   AC_TRY_LINK([#include <pthread.h>],
-	      [pthread_t th; pthread_join(th, 0);
-	      pthread_attr_init(0); pthread_cleanup_push(0, 0);
-	      pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-	      [done=yes])
-	
-	   if test "x$done" = xyes; then
-	      AC_MSG_RESULT([yes])
-	      PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
-	   else
-	      AC_MSG_RESULT([no])
-	   fi
-	fi
-	#
-	# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
-	#
-	if test x"$done" = xno; then
-	   AC_MSG_CHECKING([whether -lc_r fixes that])
-	   LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
-	   AC_TRY_LINK([#include <pthread.h>],
-	       [pthread_t th; pthread_join(th, 0);
-	        pthread_attr_init(0); pthread_cleanup_push(0, 0);
-	        pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-	       [done=yes])
-	
-	   if test "x$done" = xyes; then
-	      AC_MSG_RESULT([yes])
-	      PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
-	   else
-	      AC_MSG_RESULT([no])
-	   fi
-	fi
-	if test x"$done" = xno; then
-	   # OK, we have run out of ideas
-	   AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
-	
-	   # so it's not safe to assume that we may use pthreads
-	   acx_pthread_ok=no
-	fi
-	
-	AC_MSG_CHECKING([whether what we have so far is sufficient with -nostdlib])
-	CFLAGS="-nostdlib $CFLAGS"
-	# we need c with nostdlib
-	LIBS="$LIBS -lc"
-	AC_TRY_LINK([#include <pthread.h>],
-	      [pthread_t th; pthread_join(th, 0);
-	       pthread_attr_init(0); pthread_cleanup_push(0, 0);
-	       pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-	      [done=yes],[done=no])
-
-	if test "x$done" = xyes; then
-	   AC_MSG_RESULT([yes])
-	else
-	   AC_MSG_RESULT([no])
-	fi
-	
-	if test x"$done" = xno; then
-	   AC_MSG_CHECKING([whether -lpthread saves the day])
-	   LIBS="-lpthread $LIBS"
-	   AC_TRY_LINK([#include <pthread.h>],
-	      [pthread_t th; pthread_join(th, 0);
-	       pthread_attr_init(0); pthread_cleanup_push(0, 0);
-	       pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
-	      [done=yes],[done=no])
-
-	   if test "x$done" = xyes; then
-	      AC_MSG_RESULT([yes])
-	      PTHREAD_LIBS="$PTHREAD_LIBS -lpthread"
-	   else
-	      AC_MSG_RESULT([no])
-	      AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries and -nostdlib])
-	   fi
-	fi
-
-	CFLAGS="$save_CFLAGS"
-	LIBS="$save_LIBS"
-	CC="$save_CC"
-else
-        PTHREAD_CC="$CC"
-fi
-
-AC_SUBST(PTHREAD_LIBS)
-AC_SUBST(PTHREAD_CFLAGS)
-AC_SUBST(PTHREAD_CC)
-
-# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test x"$acx_pthread_ok" = xyes; then
-        ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
-        :
-else
-        acx_pthread_ok=no
-        $2
-fi
-AC_LANG_RESTORE
-])dnl ACX_PTHREAD
diff --git a/m4/ax_cxx_compile_stdcxx.m4 b/m4/ax_cxx_compile_stdcxx.m4
index b61fcb63..d3288e2f 100644
--- a/m4/ax_cxx_compile_stdcxx.m4
+++ b/m4/ax_cxx_compile_stdcxx.m4
@@ -180,6 +180,8 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
 
 #else
 
+#include <utility>
+
 namespace cxx11
 {
 
@@ -445,6 +447,23 @@ namespace cxx11
 
   }
 
+  namespace test_std_move_and_forward
+  {
+    struct message {};
+    char foo(message&) { return '\0'; }
+    int foo(message&&) { return 0; }
+
+    template<typename Arg, typename RT>
+    void check(Arg&& arg, RT rt) {
+      static_assert(sizeof(rt) == sizeof(foo(std::forward<Arg>(arg))), "");
+    }
+    void test() {
+      message a;
+      check(a, char());
+      check(std::move(a), int());
+    }
+  }
+
 }  // namespace cxx11
 
 #endif  // __cplusplus >= 201103L
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
new file mode 100644
index 00000000..d218d1af
--- /dev/null
+++ b/m4/ax_pthread.m4
@@ -0,0 +1,485 @@
+# ===========================================================================
+#        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+#
+# DESCRIPTION
+#
+#   This macro figures out how to build C programs using POSIX threads. It
+#   sets the PTHREAD_LIBS output variable to the threads library and linker
+#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
+#   flags that are needed. (The user can also force certain compiler
+#   flags/libs to be tested by setting these environment variables.)
+#
+#   Also sets PTHREAD_CC to any special C compiler that is needed for
+#   multi-threaded programs (defaults to the value of CC otherwise). (This
+#   is necessary on AIX to use the special cc_r compiler alias.)
+#
+#   NOTE: You are assumed to not only compile your program with these flags,
+#   but also to link with them as well. For example, you might link with
+#   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
+#
+#   If you are only building threaded programs, you may wish to use these
+#   variables in your default LIBS, CFLAGS, and CC:
+#
+#     LIBS="$PTHREAD_LIBS $LIBS"
+#     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+#     CC="$PTHREAD_CC"
+#
+#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
+#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
+#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+#
+#   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
+#   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
+#   PTHREAD_CFLAGS.
+#
+#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
+#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
+#   is not found. If ACTION-IF-FOUND is not specified, the default action
+#   will define HAVE_PTHREAD.
+#
+#   Please let the authors know if this macro fails on any platform, or if
+#   you have any other suggestions or comments. This macro was based on work
+#   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
+#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
+#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
+#   grateful for the helpful feedback of numerous users.
+#
+#   Updated for Autoconf 2.68 by Daniel Richard G.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+#   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 22
+
+AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
+AC_DEFUN([AX_PTHREAD], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_CC])
+AC_REQUIRE([AC_PROG_SED])
+AC_LANG_PUSH([C])
+ax_pthread_ok=no
+
+# We used to check for pthread.h first, but this fails if pthread.h
+# requires special compiler flags (e.g. on Tru64 or Sequent).
+# It gets checked for in the link test anyway.
+
+# First of all, check if the user has set any of the PTHREAD_LIBS,
+# etcetera environment variables, and if threads linking works using
+# them:
+if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
+	ax_pthread_save_CC="$CC"
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+	AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
+	AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
+	AC_MSG_RESULT([$ax_pthread_ok])
+	if test "x$ax_pthread_ok" = "xno"; then
+		PTHREAD_LIBS=""
+		PTHREAD_CFLAGS=""
+	fi
+	CC="$ax_pthread_save_CC"
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
+fi
+
+# We must check for the threads library under a number of different
+# names; the ordering is very important because some systems
+# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
+# libraries is broken (non-POSIX).
+
+# Create a list of thread flags to try.  Items starting with a "-" are
+# C compiler flags, and other items are library names, except for "none"
+# which indicates that we try without any flags at all, and "pthread-config"
+# which is a program returning the flags for the Pth emulation library.
+
+ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+
+# The ordering *is* (sometimes) important.  Some notes on the
+# individual items follow:
+
+# pthreads: AIX (must check this before -lpthread)
+# none: in case threads are in libc; should be tried before -Kthread and
+#       other compiler flags to prevent continual compiler warnings
+# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
+#           (Note: HP C rejects this with "bad form for `-t' option")
+# -pthreads: Solaris/gcc (Note: HP C also rejects)
+# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
+#      doesn't hurt to check since this sometimes defines pthreads and
+#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
+#      is present but should not be used directly; and before -mthreads,
+#      because the compiler interprets this as "-mt" + "-hreads")
+# -mthreads: Mingw32/gcc, Lynx/gcc
+# pthread: Linux, etcetera
+# --thread-safe: KAI C++
+# pthread-config: use pthread-config program (for GNU Pth library)
+
+case $host_os in
+
+	freebsd*)
+
+	# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+	# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+
+	ax_pthread_flags="-kthread lthread $ax_pthread_flags"
+	;;
+
+	hpux*)
+
+	# From the cc(1) man page: "[-mt] Sets various -D flags to enable
+	# multi-threading and also sets -lpthread."
+
+	ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
+	;;
+
+	openedition*)
+
+	# IBM z/OS requires a feature-test macro to be defined in order to
+	# enable POSIX threads at all, so give the user a hint if this is
+	# not set. (We don't define these ourselves, as they can affect
+	# other portions of the system API in unpredictable ways.)
+
+	AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
+	    [
+#	     if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
+	     AX_PTHREAD_ZOS_MISSING
+#	     endif
+	    ],
+	    [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
+	;;
+
+	solaris*)
+
+	# On Solaris (at least, for some versions), libc contains stubbed
+	# (non-functional) versions of the pthreads routines, so link-based
+	# tests will erroneously succeed. (N.B.: The stubs are missing
+	# pthread_cleanup_push, or rather a function called by this macro,
+	# so we could check for that, but who knows whether they'll stub
+	# that too in a future libc.)  So we'll check first for the
+	# standard Solaris way of linking pthreads (-mt -lpthread).
+
+	ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
+	;;
+esac
+
+# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
+
+AS_IF([test "x$GCC" = "xyes"],
+      [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
+
+# The presence of a feature test macro requesting re-entrant function
+# definitions is, on some systems, a strong hint that pthreads support is
+# correctly enabled
+
+case $host_os in
+	darwin* | hpux* | linux* | osf* | solaris*)
+	ax_pthread_check_macro="_REENTRANT"
+	;;
+
+	aix* | freebsd*)
+	ax_pthread_check_macro="_THREAD_SAFE"
+	;;
+
+	*)
+	ax_pthread_check_macro="--"
+	;;
+esac
+AS_IF([test "x$ax_pthread_check_macro" = "x--"],
+      [ax_pthread_check_cond=0],
+      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
+
+# Are we compiling with Clang?
+
+AC_CACHE_CHECK([whether $CC is Clang],
+    [ax_cv_PTHREAD_CLANG],
+    [ax_cv_PTHREAD_CLANG=no
+     # Note that Autoconf sets GCC=yes for Clang as well as GCC
+     if test "x$GCC" = "xyes"; then
+	AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
+	    [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
+#	     if defined(__clang__) && defined(__llvm__)
+	     AX_PTHREAD_CC_IS_CLANG
+#	     endif
+	    ],
+	    [ax_cv_PTHREAD_CLANG=yes])
+     fi
+    ])
+ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
+
+ax_pthread_clang_warning=no
+
+# Clang needs special handling, because older versions handle the -pthread
+# option in a rather... idiosyncratic way
+
+if test "x$ax_pthread_clang" = "xyes"; then
+
+	# Clang takes -pthread; it has never supported any other flag
+
+	# (Note 1: This will need to be revisited if a system that Clang
+	# supports has POSIX threads in a separate library.  This tends not
+	# to be the way of modern systems, but it's conceivable.)
+
+	# (Note 2: On some systems, notably Darwin, -pthread is not needed
+	# to get POSIX threads support; the API is always present and
+	# active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
+	# -pthread does define _REENTRANT, and while the Darwin headers
+	# ignore this macro, third-party headers might not.)
+
+	PTHREAD_CFLAGS="-pthread"
+	PTHREAD_LIBS=
+
+	ax_pthread_ok=yes
+
+	# However, older versions of Clang make a point of warning the user
+	# that, in an invocation where only linking and no compilation is
+	# taking place, the -pthread option has no effect ("argument unused
+	# during compilation").  They expect -pthread to be passed in only
+	# when source code is being compiled.
+	#
+	# Problem is, this is at odds with the way Automake and most other
+	# C build frameworks function, which is that the same flags used in
+	# compilation (CFLAGS) are also used in linking.  Many systems
+	# supported by AX_PTHREAD require exactly this for POSIX threads
+	# support, and in fact it is often not straightforward to specify a
+	# flag that is used only in the compilation phase and not in
+	# linking.  Such a scenario is extremely rare in practice.
+	#
+	# Even though use of the -pthread flag in linking would only print
+	# a warning, this can be a nuisance for well-run software projects
+	# that build with -Werror.  So if the active version of Clang has
+	# this misfeature, we search for an option to squash it.
+
+	AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
+	    [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
+	    [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
+	     # Create an alternate version of $ac_link that compiles and
+	     # links in two steps (.c -> .o, .o -> exe) instead of one
+	     # (.c -> exe), because the warning occurs only in the second
+	     # step
+	     ax_pthread_save_ac_link="$ac_link"
+	     ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
+	     ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
+	     ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
+	     ax_pthread_save_CFLAGS="$CFLAGS"
+	     for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
+		AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
+		CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
+		ac_link="$ax_pthread_save_ac_link"
+		AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+		    [ac_link="$ax_pthread_2step_ac_link"
+		     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
+			 [break])
+		    ])
+	     done
+	     ac_link="$ax_pthread_save_ac_link"
+	     CFLAGS="$ax_pthread_save_CFLAGS"
+	     AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
+	     ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
+	    ])
+
+	case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
+		no | unknown) ;;
+		*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
+	esac
+
+fi # $ax_pthread_clang = yes
+
+if test "x$ax_pthread_ok" = "xno"; then
+for ax_pthread_try_flag in $ax_pthread_flags; do
+
+	case $ax_pthread_try_flag in
+		none)
+		AC_MSG_CHECKING([whether pthreads work without any flags])
+		;;
+
+		-mt,pthread)
+		AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
+		PTHREAD_CFLAGS="-mt"
+		PTHREAD_LIBS="-lpthread"
+		;;
+
+		-*)
+		AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
+		PTHREAD_CFLAGS="$ax_pthread_try_flag"
+		;;
+
+		pthread-config)
+		AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
+		AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
+		PTHREAD_CFLAGS="`pthread-config --cflags`"
+		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
+		;;
+
+		*)
+		AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
+		PTHREAD_LIBS="-l$ax_pthread_try_flag"
+		;;
+	esac
+
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+
+	# Check for various functions.  We must include pthread.h,
+	# since some functions may be macros.  (On the Sequent, we
+	# need a special flag -Kthread to make this header compile.)
+	# We check for pthread_join because it is in -lpthread on IRIX
+	# while pthread_create is in libc.  We check for pthread_attr_init
+	# due to DEC craziness with -lpthreads.  We check for
+	# pthread_cleanup_push because it is one of the few pthread
+	# functions on Solaris that doesn't have a non-functional libc stub.
+	# We try pthread_create on general principles.
+
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
+#			if $ax_pthread_check_cond
+#			 error "$ax_pthread_check_macro must be defined"
+#			endif
+			static void routine(void *a) { a = 0; }
+			static void *start_routine(void *a) { return a; }],
+		       [pthread_t th; pthread_attr_t attr;
+			pthread_create(&th, 0, start_routine, 0);
+			pthread_join(th, 0);
+			pthread_attr_init(&attr);
+			pthread_cleanup_push(routine, 0);
+			pthread_cleanup_pop(0) /* ; */])],
+	    [ax_pthread_ok=yes],
+	    [])
+
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
+
+	AC_MSG_RESULT([$ax_pthread_ok])
+	AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
+
+	PTHREAD_LIBS=""
+	PTHREAD_CFLAGS=""
+done
+fi
+
+# Various other checks:
+if test "x$ax_pthread_ok" = "xyes"; then
+	ax_pthread_save_CFLAGS="$CFLAGS"
+	ax_pthread_save_LIBS="$LIBS"
+	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+	LIBS="$PTHREAD_LIBS $LIBS"
+
+	# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
+	AC_CACHE_CHECK([for joinable pthread attribute],
+	    [ax_cv_PTHREAD_JOINABLE_ATTR],
+	    [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
+	     for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+		 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
+						 [int attr = $ax_pthread_attr; return attr /* ; */])],
+				[ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
+				[])
+	     done
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
+	       test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
+	       test "x$ax_pthread_joinable_attr_defined" != "xyes"],
+	      [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
+				  [$ax_cv_PTHREAD_JOINABLE_ATTR],
+				  [Define to necessary symbol if this constant
+				   uses a non-standard name on your system.])
+	       ax_pthread_joinable_attr_defined=yes
+	      ])
+
+	AC_CACHE_CHECK([whether more special flags are required for pthreads],
+	    [ax_cv_PTHREAD_SPECIAL_FLAGS],
+	    [ax_cv_PTHREAD_SPECIAL_FLAGS=no
+	     case $host_os in
+	     solaris*)
+	     ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
+	     ;;
+	     esac
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
+	       test "x$ax_pthread_special_flags_added" != "xyes"],
+	      [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
+	       ax_pthread_special_flags_added=yes])
+
+	AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
+	    [ax_cv_PTHREAD_PRIO_INHERIT],
+	    [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
+					     [[int i = PTHREAD_PRIO_INHERIT;]])],
+			    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
+			    [ax_cv_PTHREAD_PRIO_INHERIT=no])
+	    ])
+	AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
+	       test "x$ax_pthread_prio_inherit_defined" != "xyes"],
+	      [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
+	       ax_pthread_prio_inherit_defined=yes
+	      ])
+
+	CFLAGS="$ax_pthread_save_CFLAGS"
+	LIBS="$ax_pthread_save_LIBS"
+
+	# More AIX lossage: compile with *_r variant
+	if test "x$GCC" != "xyes"; then
+	    case $host_os in
+		aix*)
+		AS_CASE(["x/$CC"],
+		    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
+		    [#handle absolute path differently from PATH based program lookup
+		     AS_CASE(["x$CC"],
+			 [x/*],
+			 [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
+			 [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
+		;;
+	    esac
+	fi
+fi
+
+test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
+
+AC_SUBST([PTHREAD_LIBS])
+AC_SUBST([PTHREAD_CFLAGS])
+AC_SUBST([PTHREAD_CC])
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test "x$ax_pthread_ok" = "xyes"; then
+	ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
+	:
+else
+	ax_pthread_ok=no
+	$2
+fi
+AC_LANG_POP
+])dnl AX_PTHREAD
diff --git a/more_tests/Makefile b/more_tests/Makefile
deleted file mode 100755
index 286cf0f1..00000000
--- a/more_tests/Makefile
+++ /dev/null
@@ -1,41 +0,0 @@
-# Additional tests to run before releasing a package.
-#
-# Run like:
-#   make PACKAGE=/path/to/protobuf-VERSION.tar.gz
-#
-# Some of these tests require tools or make assumptions that may not be
-# available on end-user machines, so these cannot be part of "make check".  For
-# example, we test that the headers compile with strict warning settings, but
-# since different compilers produce wildly different warnings we cannot assume
-# that this test will pass everywhere.  If we ran it as part of "make check",
-# it could unnecessarily block users from running the real tests just because
-# their compiler produces some extra warnings that probably aren't a big deal.
-# So we run it separately. 
-
-all: header_warning_test
-
-clean:
-	rm -rf src target header_warning_test.cc header_warning_test.o header_warning_test
-
-# Unpack the package into src, then install it into target.
-PACKAGE=protobuf.tar.gz
-
-src: $(PACKAGE)
-	tar zxvf $(PACKAGE)
-	mv `basename $(PACKAGE) .tar.gz` src
-
-target: src
-	(cd src && ./configure --prefix=$$PWD/../target --disable-shared)
-	(cd src && make -j4 check)
-	(cd src && make install)
-
-# Verify that headers produce no warnings even under strict settings.
-header_warning_test.cc: target
-	( (cd target/include && find google/protobuf -name '*.h') | \
-	  awk '{print "#include \""$$1"\""} ' > header_warning_test.cc )
-
-header_warning_test: header_warning_test.cc
-	# TODO(kenton):  Consider adding -pedantic and -Weffc++.  Currently these
-	#   produce tons of extra warnings so we'll need to do some work first.
-	g++ -Itarget/include -Wall -Werror -Wsign-compare -O2 -c header_warning_test.cc
-	touch header_warning_test
diff --git a/objectivec/DevTools/full_mac_build.sh b/objectivec/DevTools/full_mac_build.sh
index ea9fd273..c673fcba 100755
--- a/objectivec/DevTools/full_mac_build.sh
+++ b/objectivec/DevTools/full_mac_build.sh
@@ -244,8 +244,7 @@ if [[ "${DO_XCODE_IOS_TESTS}" == "yes" ]] ; then
       exit 10
       ;;
     7.* )
-      echo "ERROR: The unittests include Swift code that is now Swift 3.0." 1>&2
-      echo "ERROR: Xcode 8.0 or higher is required to build the test suite, but the library works with Xcode 7.x." 1>&2
+      echo "ERROR: Xcode 7.x no longer supported for building, please use 8.0 or higher." 1>&2
       exit 11
       ;;
     8.0* )
@@ -253,28 +252,36 @@ if [[ "${DO_XCODE_IOS_TESTS}" == "yes" ]] ; then
       XCODEBUILD_TEST_BASE_IOS+=(
           -destination "platform=iOS Simulator,name=iPhone 4s,OS=9.0" # 32bit
           -destination "platform=iOS Simulator,name=iPhone 7,OS=10.0" # 64bit
-          -destination "platform=iOS Simulator,name=iPad 2,OS=9.0" # 32bit
-          -destination "platform=iOS Simulator,name=iPad Pro (9.7 inch),OS=10.0" # 64bit
       )
       ;;
-    8.1* )
+    8.[1-3]* )
       XCODEBUILD_TEST_BASE_IOS+=(
           -destination "platform=iOS Simulator,name=iPhone 4s,OS=8.1" # 32bit
-          -destination "platform=iOS Simulator,name=iPhone 7,OS=10.1" # 64bit
-          -destination "platform=iOS Simulator,name=iPad 2,OS=8.1" # 32bit
-          -destination "platform=iOS Simulator,name=iPad Pro (9.7 inch),OS=10.1" # 64bit
+          -destination "platform=iOS Simulator,name=iPhone 7,OS=latest" # 64bit
       )
       ;;
-    8.2* )
+    9.[0-2]* )
       XCODEBUILD_TEST_BASE_IOS+=(
           -destination "platform=iOS Simulator,name=iPhone 4s,OS=8.1" # 32bit
-          -destination "platform=iOS Simulator,name=iPhone 7,OS=10.2" # 64bit
-          -destination "platform=iOS Simulator,name=iPad 2,OS=8.1" # 32bit
-          -destination "platform=iOS Simulator,name=iPad Pro (9.7 inch),OS=10.2" # 64bit
+          -destination "platform=iOS Simulator,name=iPhone 7,OS=latest" # 64bit
+          # 9.0-9.2 all seem to often fail running destinations in parallel
+          -disable-concurrent-testing
+      )
+      ;;
+    9.3* )
+      XCODEBUILD_TEST_BASE_IOS+=(
+          # Xcode 9.3 chokes targeting iOS 8.x - http://www.openradar.me/39335367
+          -destination "platform=iOS Simulator,name=iPhone 4s,OS=9.0" # 32bit
+          -destination "platform=iOS Simulator,name=iPhone 7,OS=latest" # 64bit
+          # 9.3 also seems to often fail running destinations in parallel
+          -disable-concurrent-testing
       )
       ;;
     * )
-      echo "Time to update the simulator targets for Xcode ${XCODE_VERSION}"
+      echo ""
+      echo "ATTENTION: Time to update the simulator targets for Xcode ${XCODE_VERSION}"
+      echo ""
+      echo "Build aborted!"
       exit 2
       ;;
   esac
@@ -287,7 +294,7 @@ if [[ "${DO_XCODE_IOS_TESTS}" == "yes" ]] ; then
     "${XCODEBUILD_TEST_BASE_IOS[@]}" -configuration Release test
   fi
   # Don't leave the simulator in the developer's face.
-  killall Simulator
+  killall Simulator 2> /dev/null || true
 fi
 if [[ "${DO_XCODE_OSX_TESTS}" == "yes" ]] ; then
   XCODEBUILD_TEST_BASE_OSX=(
diff --git a/objectivec/DevTools/pddm.py b/objectivec/DevTools/pddm.py
index 9a11fec4..0b5b7b40 100755
--- a/objectivec/DevTools/pddm.py
+++ b/objectivec/DevTools/pddm.py
@@ -124,6 +124,7 @@ def _MacroRefRe(macro_names):
   return re.compile(r'\b(?P<macro_ref>(?P<name>(%s))\((?P<args>.*?)\))' %
                     '|'.join(macro_names))
 
+
 def _MacroArgRefRe(macro_arg_names):
   # Takes in a list of macro arg names and makes a regex that will match
   # uses of those args.
@@ -318,25 +319,26 @@ class MacroCollection(object):
       return macro.body
     assert len(arg_values) == len(macro.args)
     args = dict(zip(macro.args, arg_values))
+
     def _lookupArg(match):
       val = args[match.group('name')]
       opt = match.group('option')
       if opt:
-        if opt == 'S': # Spaces for the length
+        if opt == 'S':  # Spaces for the length
           return ' ' * len(val)
-        elif opt == 'l': # Lowercase first character
+        elif opt == 'l':  # Lowercase first character
           if val:
             return val[0].lower() + val[1:]
           else:
             return val
-        elif opt == 'L': # All Lowercase
+        elif opt == 'L':  # All Lowercase
           return val.lower()
-        elif opt == 'u': # Uppercase first character
+        elif opt == 'u':  # Uppercase first character
           if val:
             return val[0].upper() + val[1:]
           else:
             return val
-        elif opt == 'U': # All Uppercase
+        elif opt == 'U':  # All Uppercase
           return val.upper()
         else:
           raise PDDMError('Unknown arg option "%s$%s" while expanding "%s".%s'
@@ -350,6 +352,7 @@ class MacroCollection(object):
 
   def _EvalMacrosRefs(self, text, macro_stack):
     macro_ref_re = _MacroRefRe(self._macros.keys())
+
     def _resolveMacro(match):
       return self._Expand(match, macro_stack)
     return macro_ref_re.sub(_resolveMacro, text)
@@ -496,9 +499,10 @@ class SourceFile(object):
       # Add the ending marker.
       if len(captured_lines) == 1:
         result.append('//%%PDDM-EXPAND-END %s' %
-                       captured_lines[0][directive_len:].strip())
+                      captured_lines[0][directive_len:].strip())
       else:
-        result.append('//%%PDDM-EXPAND-END (%s expansions)' % len(captured_lines))
+        result.append('//%%PDDM-EXPAND-END (%s expansions)' %
+                      len(captured_lines))
 
       return result
 
@@ -669,15 +673,15 @@ def main(args):
 
     if src_file.processed_content != src_file.original_content:
       if not opts.dry_run:
-        print 'Updating for "%s".' % a_path
+        print('Updating for "%s".' % a_path)
         with open(a_path, 'w') as f:
           f.write(src_file.processed_content)
       else:
         # Special result to indicate things need updating.
-        print 'Update needed for "%s".' % a_path
+        print('Update needed for "%s".' % a_path)
         result = 1
     elif opts.verbose:
-      print 'No update for "%s".' % a_path
+      print('No update for "%s".' % a_path)
 
   return result
 
diff --git a/objectivec/DevTools/pddm_tests.py b/objectivec/DevTools/pddm_tests.py
index 8a73b842..9ac6a855 100755
--- a/objectivec/DevTools/pddm_tests.py
+++ b/objectivec/DevTools/pddm_tests.py
@@ -311,7 +311,7 @@ foo(x, y)
     mc = pddm.MacroCollection(f)
     try:
       result = mc.Expand('foo(A,B)')
-      self.fail('Should throw exception, entry %d' % idx)
+      self.fail('Should throw exception! Test failed to catch recursion.')
     except pddm.PDDMError as e:
       self.assertEqual(e.message,
                        'Found macro recusion, invoking "foo(1, A)":\n...while expanding "bar(1, A)".\n...while expanding "foo(A,B)".')
@@ -483,7 +483,7 @@ foo
     sf = pddm.SourceFile(f)
     try:
       sf.ProcessContent()
-      self.fail('Should throw exception, entry %d' % idx)
+      self.fail('Should throw exception! Test failed to catch macro parsing error.')
     except pddm.PDDMError as e:
       self.assertEqual(e.message,
                        'Attempt to redefine macro: "PDDM-DEFINE mumble(x_)"\n'
@@ -503,7 +503,7 @@ foo
     sf = pddm.SourceFile(f)
     try:
       sf.ProcessContent()
-      self.fail('Should throw exception, entry %d' % idx)
+      self.fail('Should throw exception! Test failed to catch expand error.')
     except pddm.PDDMError as e:
       self.assertEqual(e.message,
                        'No macro named "foobar".\n'
diff --git a/objectivec/GPBArray.m b/objectivec/GPBArray.m
index f401631d..122e0304 100644
--- a/objectivec/GPBArray.m
+++ b/objectivec/GPBArray.m
@@ -2537,12 +2537,12 @@ static BOOL ArrayDefault_IsValidValue(int32_t value) {
   return [_array countByEnumeratingWithState:state objects:buffer count:len];
 }
 
-- (void)enumerateObjectsUsingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block {
+- (void)enumerateObjectsUsingBlock:(void (NS_NOESCAPE ^)(id obj, NSUInteger idx, BOOL *stop))block {
   [_array enumerateObjectsUsingBlock:block];
 }
 
 - (void)enumerateObjectsWithOptions:(NSEnumerationOptions)opts
-                         usingBlock:(void (^)(id obj, NSUInteger idx, BOOL *stop))block {
+                         usingBlock:(void (NS_NOESCAPE ^)(id obj, NSUInteger idx, BOOL *stop))block {
   [_array enumerateObjectsWithOptions:opts usingBlock:block];
 }
 
diff --git a/objectivec/GPBCodedInputStream.m b/objectivec/GPBCodedInputStream.m
index e8c8989c..dd05ddb4 100644
--- a/objectivec/GPBCodedInputStream.m
+++ b/objectivec/GPBCodedInputStream.m
@@ -45,7 +45,12 @@ NSString *const GPBCodedInputStreamUnderlyingErrorKey =
 NSString *const GPBCodedInputStreamErrorDomain =
     GPBNSStringifySymbol(GPBCodedInputStreamErrorDomain);
 
-static const NSUInteger kDefaultRecursionLimit = 64;
+// Matching:
+// https://github.com/google/protobuf/blob/master/java/core/src/main/java/com/google/protobuf/CodedInputStream.java#L62
+//  private static final int DEFAULT_RECURSION_LIMIT = 100;
+// https://github.com/google/protobuf/blob/master/src/google/protobuf/io/coded_stream.cc#L86
+//  int CodedInputStream::default_recursion_limit_ = 100;
+static const NSUInteger kDefaultRecursionLimit = 100;
 
 static void RaiseException(NSInteger code, NSString *reason) {
   NSDictionary *errorInfo = nil;
@@ -58,9 +63,15 @@ static void RaiseException(NSInteger code, NSString *reason) {
 
   NSDictionary *exceptionInfo =
       @{ GPBCodedInputStreamUnderlyingErrorKey: error };
-  [[[NSException alloc] initWithName:GPBCodedInputStreamException
-                              reason:reason
-                            userInfo:exceptionInfo] raise];
+  [[NSException exceptionWithName:GPBCodedInputStreamException
+                           reason:reason
+                         userInfo:exceptionInfo] raise];
+}
+
+static void CheckRecursionLimit(GPBCodedInputStreamState *state) {
+  if (state->recursionDepth >= kDefaultRecursionLimit) {
+    RaiseException(GPBCodedInputStreamErrorRecursionDepthExceeded, nil);
+  }
 }
 
 static void CheckSize(GPBCodedInputStreamState *state, size_t size) {
@@ -94,47 +105,12 @@ static int64_t ReadRawLittleEndian64(GPBCodedInputStreamState *state) {
   return value;
 }
 
-static int32_t ReadRawVarint32(GPBCodedInputStreamState *state) {
-  int8_t tmp = ReadRawByte(state);
-  if (tmp >= 0) {
-    return tmp;
-  }
-  int32_t result = tmp & 0x7f;
-  if ((tmp = ReadRawByte(state)) >= 0) {
-    result |= tmp << 7;
-  } else {
-    result |= (tmp & 0x7f) << 7;
-    if ((tmp = ReadRawByte(state)) >= 0) {
-      result |= tmp << 14;
-    } else {
-      result |= (tmp & 0x7f) << 14;
-      if ((tmp = ReadRawByte(state)) >= 0) {
-        result |= tmp << 21;
-      } else {
-        result |= (tmp & 0x7f) << 21;
-        result |= (tmp = ReadRawByte(state)) << 28;
-        if (tmp < 0) {
-          // Discard upper 32 bits.
-          for (int i = 0; i < 5; i++) {
-            if (ReadRawByte(state) >= 0) {
-              return result;
-            }
-          }
-          RaiseException(GPBCodedInputStreamErrorInvalidVarInt,
-                         @"Invalid VarInt32");
-        }
-      }
-    }
-  }
-  return result;
-}
-
 static int64_t ReadRawVarint64(GPBCodedInputStreamState *state) {
   int32_t shift = 0;
   int64_t result = 0;
   while (shift < 64) {
     int8_t b = ReadRawByte(state);
-    result |= (int64_t)(b & 0x7F) << shift;
+    result |= (int64_t)((uint64_t)(b & 0x7F) << shift);
     if ((b & 0x80) == 0) {
       return result;
     }
@@ -144,6 +120,10 @@ static int64_t ReadRawVarint64(GPBCodedInputStreamState *state) {
   return 0;
 }
 
+static int32_t ReadRawVarint32(GPBCodedInputStreamState *state) {
+  return (int32_t)ReadRawVarint64(state);
+}
+
 static void SkipRawData(GPBCodedInputStreamState *state, size_t size) {
   CheckSize(state, size);
   state->bufferPos += size;
@@ -225,16 +205,16 @@ int32_t GPBCodedInputStreamReadTag(GPBCodedInputStreamState *state) {
   }
 
   state->lastTag = ReadRawVarint32(state);
-  if (state->lastTag == 0) {
-    // If we actually read zero, that's not a valid tag.
-    RaiseException(GPBCodedInputStreamErrorInvalidTag,
-                   @"A zero tag on the wire is invalid.");
-  }
-  // Tags have to include a valid wireformat, check that also.
+  // Tags have to include a valid wireformat.
   if (!GPBWireFormatIsValidTag(state->lastTag)) {
     RaiseException(GPBCodedInputStreamErrorInvalidTag,
                    @"Invalid wireformat in tag.");
   }
+  // Zero is not a valid field number.
+  if (GPBWireFormatGetTagFieldNumber(state->lastTag) == 0) {
+    RaiseException(GPBCodedInputStreamErrorInvalidTag,
+                   @"A zero field number on the wire is invalid.");
+  }
   return state->lastTag;
 }
 
@@ -447,9 +427,7 @@ void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
 - (void)readGroup:(int32_t)fieldNumber
               message:(GPBMessage *)message
     extensionRegistry:(GPBExtensionRegistry *)extensionRegistry {
-  if (state_.recursionDepth >= kDefaultRecursionLimit) {
-    RaiseException(GPBCodedInputStreamErrorRecursionDepthExceeded, nil);
-  }
+  CheckRecursionLimit(&state_);
   ++state_.recursionDepth;
   [message mergeFromCodedInputStream:self extensionRegistry:extensionRegistry];
   GPBCodedInputStreamCheckLastTagWas(
@@ -459,9 +437,7 @@ void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
 
 - (void)readUnknownGroup:(int32_t)fieldNumber
                  message:(GPBUnknownFieldSet *)message {
-  if (state_.recursionDepth >= kDefaultRecursionLimit) {
-    RaiseException(GPBCodedInputStreamErrorRecursionDepthExceeded, nil);
-  }
+  CheckRecursionLimit(&state_);
   ++state_.recursionDepth;
   [message mergeFromCodedInputStream:self];
   GPBCodedInputStreamCheckLastTagWas(
@@ -471,10 +447,8 @@ void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
 
 - (void)readMessage:(GPBMessage *)message
     extensionRegistry:(GPBExtensionRegistry *)extensionRegistry {
+  CheckRecursionLimit(&state_);
   int32_t length = ReadRawVarint32(&state_);
-  if (state_.recursionDepth >= kDefaultRecursionLimit) {
-    RaiseException(GPBCodedInputStreamErrorRecursionDepthExceeded, nil);
-  }
   size_t oldLimit = GPBCodedInputStreamPushLimit(&state_, length);
   ++state_.recursionDepth;
   [message mergeFromCodedInputStream:self extensionRegistry:extensionRegistry];
@@ -487,10 +461,8 @@ void GPBCodedInputStreamCheckLastTagWas(GPBCodedInputStreamState *state,
     extensionRegistry:(GPBExtensionRegistry *)extensionRegistry
                 field:(GPBFieldDescriptor *)field
         parentMessage:(GPBMessage *)parentMessage {
+  CheckRecursionLimit(&state_);
   int32_t length = ReadRawVarint32(&state_);
-  if (state_.recursionDepth >= kDefaultRecursionLimit) {
-    RaiseException(GPBCodedInputStreamErrorRecursionDepthExceeded, nil);
-  }
   size_t oldLimit = GPBCodedInputStreamPushLimit(&state_, length);
   ++state_.recursionDepth;
   GPBDictionaryReadEntry(mapDictionary, self, extensionRegistry, field,
diff --git a/objectivec/GPBCodedInputStream_PackagePrivate.h b/objectivec/GPBCodedInputStream_PackagePrivate.h
index 90bd0c92..43ec6e79 100644
--- a/objectivec/GPBCodedInputStream_PackagePrivate.h
+++ b/objectivec/GPBCodedInputStream_PackagePrivate.h
@@ -34,8 +34,6 @@
 
 #import "GPBCodedInputStream.h"
 
-#import <libkern/OSAtomic.h>
-
 @class GPBUnknownFieldSet;
 @class GPBFieldDescriptor;
 
diff --git a/objectivec/GPBCodedOutputStream.h b/objectivec/GPBCodedOutputStream.h
index d6fff3db..23c404b8 100644
--- a/objectivec/GPBCodedOutputStream.h
+++ b/objectivec/GPBCodedOutputStream.h
@@ -47,11 +47,20 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /**
+ * @c GPBCodedOutputStream exception names.
+ **/
+extern NSString *const GPBCodedOutputStreamException_OutOfSpace;
+extern NSString *const GPBCodedOutputStreamException_WriteFailed;
+
+/**
  * Writes out protocol message fields.
  *
  * The common uses of protocol buffers shouldn't need to use this class.
  * GPBMessage's provide a -data method that will serialize the message for you.
  *
+ * @note Any -write* api can raise the GPBCodedOutputStreamException_*
+ *       exceptions.
+ *
  * @note Subclassing of GPBCodedOutputStream is NOT supported.
  **/
 @interface GPBCodedOutputStream : NSObject
diff --git a/objectivec/GPBCodedOutputStream.m b/objectivec/GPBCodedOutputStream.m
index 7c3ab447..b846c2fc 100644
--- a/objectivec/GPBCodedOutputStream.m
+++ b/objectivec/GPBCodedOutputStream.m
@@ -36,6 +36,11 @@
 #import "GPBUnknownFieldSet_PackagePrivate.h"
 #import "GPBUtilities_PackagePrivate.h"
 
+// These values are the existing values so as not to break any code that might
+// have already been inspecting them when they weren't documented/exposed.
+NSString *const GPBCodedOutputStreamException_OutOfSpace = @"OutOfSpace";
+NSString *const GPBCodedOutputStreamException_WriteFailed = @"WriteFailed";
+
 // Structure for containing state of a GPBCodedInputStream. Brought out into
 // a struct so that we can inline several common functions instead of dealing
 // with overhead of ObjC dispatch.
@@ -59,13 +64,13 @@ static const int32_t LITTLE_ENDIAN_64_SIZE = sizeof(uint64_t);
 static void GPBRefreshBuffer(GPBOutputBufferState *state) {
   if (state->output == nil) {
     // We're writing to a single buffer.
-    [NSException raise:@"OutOfSpace" format:@""];
+    [NSException raise:GPBCodedOutputStreamException_OutOfSpace format:@""];
   }
   if (state->position != 0) {
     NSInteger written =
         [state->output write:state->bytes maxLength:state->position];
     if (written != (NSInteger)state->position) {
-      [NSException raise:@"WriteFailed" format:@""];
+      [NSException raise:GPBCodedOutputStreamException_WriteFailed format:@""];
     }
     state->position = 0;
   }
@@ -169,10 +174,10 @@ static void GPBWriteRawLittleEndian64(GPBOutputBufferState *state,
                                 data:(NSMutableData *)data {
   if ((self = [super init])) {
     buffer_ = [data retain];
-    [output open];
     state_.bytes = [data mutableBytes];
     state_.size = [data length];
     state_.output = [output retain];
+    [state_.output open];
   }
   return self;
 }
@@ -937,7 +942,10 @@ static void GPBWriteRawLittleEndian64(GPBOutputBufferState *state,
       state_.position = length;
     } else {
       // Write is very big.  Let's do it all at once.
-      [state_.output write:((uint8_t *)value) + offset maxLength:length];
+      NSInteger written = [state_.output write:((uint8_t *)value) + offset maxLength:length];
+      if (written != (NSInteger)length) {
+        [NSException raise:GPBCodedOutputStreamException_WriteFailed format:@""];
+      }
     }
   }
 }
diff --git a/objectivec/GPBDescriptor.h b/objectivec/GPBDescriptor.h
index 651f4de0..292bce13 100644
--- a/objectivec/GPBDescriptor.h
+++ b/objectivec/GPBDescriptor.h
@@ -223,9 +223,12 @@ typedef NS_ENUM(uint8_t, GPBFieldType) {
 /**
  * Returns the enum value name for the given raw enum.
  *
+ * Note that there can be more than one name corresponding to a given value
+ * if the allow_alias option is used.
+ *
  * @param number The raw enum value.
  *
- * @return The name of the enum value passed, or nil if not valid.
+ * @return The first name that matches the enum value passed, or nil if not valid.
  **/
 - (nullable NSString *)enumNameForValue:(int32_t)number;
 
@@ -244,7 +247,7 @@ typedef NS_ENUM(uint8_t, GPBFieldType) {
  *
  * @param number The raw enum value.
  *
- * @return The text format name for the raw enum value, or nil if not valid.
+ * @return The first text format name which matches the enum value, or nil if not valid.
  **/
 - (nullable NSString *)textFormatNameForValue:(int32_t)number;
 
@@ -258,6 +261,33 @@ typedef NS_ENUM(uint8_t, GPBFieldType) {
  **/
 - (BOOL)getValue:(nullable int32_t *)outValue forEnumTextFormatName:(NSString *)textFormatName;
 
+/**
+ * Gets the number of defined enum names.
+ *
+ * @return Count of the number of enum names, including any aliases.
+ */
+@property(nonatomic, readonly) uint32_t enumNameCount;
+
+/**
+ * Gets the enum name corresponding to the given index.
+ *
+ * @param index Index into the available names.  The defined range is from 0
+ *              to self.enumNameCount - 1.
+ *
+ * @returns The enum name at the given index, or nil if the index is out of range.
+ */
+- (nullable NSString *)getEnumNameForIndex:(uint32_t)index;
+
+/**
+ * Gets the enum text format name corresponding to the given index.
+ *
+ * @param index Index into the available names.  The defined range is from 0
+ *              to self.enumNameCount - 1.
+ *
+ * @returns The text format name at the given index, or nil if the index is out of range.
+ */
+- (nullable NSString *)getEnumTextFormatNameForIndex:(uint32_t)index;
+
 @end
 
 /**
diff --git a/objectivec/GPBDescriptor.m b/objectivec/GPBDescriptor.m
index 0753a948..ad46ef4f 100644
--- a/objectivec/GPBDescriptor.m
+++ b/objectivec/GPBDescriptor.m
@@ -411,7 +411,7 @@ static NSArray *NewFieldsArrayForHasIndex(int hasIndex,
 }
 
 - (NSString *)name {
-  return @(name_);
+  return (NSString * _Nonnull)@(name_);
 }
 
 - (GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber {
@@ -548,7 +548,8 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
         // descriptor structure.
         const uint8_t *bytes = (const uint8_t *)defaultValue_.valueData;
         if (bytes) {
-          uint32_t length = *((uint32_t *)bytes);
+          uint32_t length;
+          memcpy(&length, bytes, sizeof(length));
           length = ntohl(length);
           bytes += sizeof(length);
           defaultValue_.valueData =
@@ -581,7 +582,7 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
 }
 
 - (NSString *)name {
-  return @(description_->name);
+  return (NSString * _Nonnull)@(description_->name);
 }
 
 - (BOOL)isRequired {
@@ -829,13 +830,9 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
 }
 
 - (NSString *)enumNameForValue:(int32_t)number {
-  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
-
   for (uint32_t i = 0; i < valueCount_; ++i) {
     if (values_[i] == number) {
-      const char *valueName = valueNames_ + nameOffsets_[i];
-      NSString *fullName = [NSString stringWithFormat:@"%@_%s", name_, valueName];
-      return fullName;
+      return [self getEnumNameForIndex:i];
     }
   }
   return nil;
@@ -885,8 +882,6 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
 }
 
 - (NSString *)textFormatNameForValue:(int32_t)number {
-  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
-
   // Find the EnumValue descriptor and its index.
   BOOL foundIt = NO;
   uint32_t valueDescriptorIndex;
@@ -901,16 +896,39 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
   if (!foundIt) {
     return nil;
   }
+  return [self getEnumTextFormatNameForIndex:valueDescriptorIndex];
+}
 
+- (uint32_t)enumNameCount {
+  return valueCount_;
+}
+
+- (NSString *)getEnumNameForIndex:(uint32_t)index {
+  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
+
+  if (index >= valueCount_) {
+    return nil;
+  }
+  const char *valueName = valueNames_ + nameOffsets_[index];
+  NSString *fullName = [NSString stringWithFormat:@"%@_%s", name_, valueName];
+  return fullName;
+}
+
+- (NSString *)getEnumTextFormatNameForIndex:(uint32_t)index {
+  if (nameOffsets_ == NULL) [self calcValueNameOffsets];
+
+  if (index >= valueCount_) {
+    return nil;
+  }
   NSString *result = nil;
   // Naming adds an underscore between enum name and value name, skip that also.
-  const char *valueName = valueNames_ + nameOffsets_[valueDescriptorIndex];
+  const char *valueName = valueNames_ + nameOffsets_[index];
   NSString *shortName = @(valueName);
 
   // See if it is in the map of special format handling.
   if (extraTextFormatInfo_) {
     result = GPBDecodeTextFormatName(extraTextFormatInfo_,
-                                     (int32_t)valueDescriptorIndex, shortName);
+                                     (int32_t)index, shortName);
   }
   // Logic here needs to match what objectivec_enum.cc does in the proto
   // compiler.
@@ -963,7 +981,8 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
       const uint8_t *bytes =
           (const uint8_t *)description->defaultValue.valueData;
       if (bytes) {
-        uint32_t length = *((uint32_t *)bytes);
+        uint32_t length;
+        memcpy(&length, bytes, sizeof(length));
         // The length is stored in network byte order.
         length = ntohl(length);
         bytes += sizeof(length);
@@ -996,7 +1015,7 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
 }
 
 - (NSString *)singletonName {
-  return @(description_->singletonName);
+  return (NSString * _Nonnull)@(description_->singletonName);
 }
 
 - (const char *)singletonNameC {
@@ -1027,10 +1046,6 @@ uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self) {
   return GPBExtensionIsRepeated(description_);
 }
 
-- (BOOL)isMap {
-  return (description_->options & GPBFieldMapKeyMask) != 0;
-}
-
 - (BOOL)isPackable {
   return GPBExtensionIsPacked(description_);
 }
diff --git a/objectivec/GPBDescriptor_PackagePrivate.h b/objectivec/GPBDescriptor_PackagePrivate.h
index 9173e7a2..452b3f8e 100644
--- a/objectivec/GPBDescriptor_PackagePrivate.h
+++ b/objectivec/GPBDescriptor_PackagePrivate.h
@@ -286,10 +286,6 @@ uint32_t GPBFieldTag(GPBFieldDescriptor *self);
 // would be the wire type for packed.
 uint32_t GPBFieldAlternateTag(GPBFieldDescriptor *self);
 
-GPB_INLINE BOOL GPBPreserveUnknownFields(GPBFileSyntax syntax) {
-  return syntax != GPBFileSyntaxProto3;
-}
-
 GPB_INLINE BOOL GPBHasPreservingUnknownEnumSemantics(GPBFileSyntax syntax) {
   return syntax == GPBFileSyntaxProto3;
 }
diff --git a/objectivec/GPBDictionary.h b/objectivec/GPBDictionary.h
index 9d674150..a81165e8 100644
--- a/objectivec/GPBDictionary.h
+++ b/objectivec/GPBDictionary.h
@@ -60,55 +60,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const uint32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32UInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -204,55 +155,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const uint32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32Int32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -348,55 +250,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const uint32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32UInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -492,55 +345,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const uint32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32Int64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -636,55 +440,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const uint32_t [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32BoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -780,55 +535,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const uint32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32FloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -924,55 +630,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const uint32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32DoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -1070,70 +727,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const uint32_t [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32EnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -1294,55 +887,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param object     The value to be placed in the dictionary.
- * @param key        The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithObject:(ObjectType)object
-                              forKey:(uint32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param objects      The values to be placed in the dictionary.
- * @param keys         The keys under which to store the values.
- * @param count        The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithObjects:(const ObjectType __nonnull GPB_UNSAFE_UNRETAINED [__nullable])objects
-                              forKeys:(const uint32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32ObjectDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param objects      The values to be placed in this dictionary.
@@ -1437,55 +981,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const int32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32UInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -1581,55 +1076,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const int32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32Int32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -1725,55 +1171,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const int32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32UInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -1869,55 +1266,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const int32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32Int64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -2013,55 +1361,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const int32_t [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32BoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -2157,55 +1456,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const int32_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32FloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -2301,55 +1551,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const int32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32DoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -2447,70 +1648,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const int32_t [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32EnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -2671,55 +1808,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param object     The value to be placed in the dictionary.
- * @param key        The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithObject:(ObjectType)object
-                              forKey:(int32_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param objects      The values to be placed in the dictionary.
- * @param keys         The keys under which to store the values.
- * @param count        The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithObjects:(const ObjectType __nonnull GPB_UNSAFE_UNRETAINED [__nullable])objects
-                              forKeys:(const int32_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt32ObjectDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param objects      The values to be placed in this dictionary.
@@ -2814,55 +1902,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const uint64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64UInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -2958,55 +1997,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const uint64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64Int32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3102,55 +2092,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const uint64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64UInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3246,55 +2187,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const uint64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64Int64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3390,55 +2282,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const uint64_t [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64BoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3534,55 +2377,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const uint64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64FloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3678,55 +2472,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const uint64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64DoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -3824,70 +2569,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const uint64_t [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64EnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -4048,55 +2729,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param object     The value to be placed in the dictionary.
- * @param key        The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithObject:(ObjectType)object
-                              forKey:(uint64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param objects      The values to be placed in the dictionary.
- * @param keys         The keys under which to store the values.
- * @param count        The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithObjects:(const ObjectType __nonnull GPB_UNSAFE_UNRETAINED [__nullable])objects
-                              forKeys:(const uint64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64ObjectDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param objects      The values to be placed in this dictionary.
@@ -4191,55 +2823,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const int64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64UInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -4335,55 +2918,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const int64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64Int32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -4479,55 +3013,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const int64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64UInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -4623,55 +3108,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const int64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64Int64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -4767,55 +3203,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const int64_t [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64BoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -4911,55 +3298,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const int64_t [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64FloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -5055,55 +3393,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const int64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64DoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -5201,70 +3490,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const int64_t [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64EnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -5425,55 +3650,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param object     The value to be placed in the dictionary.
- * @param key        The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithObject:(ObjectType)object
-                              forKey:(int64_t)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param objects      The values to be placed in the dictionary.
- * @param keys         The keys under which to store the values.
- * @param count        The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithObjects:(const ObjectType __nonnull GPB_UNSAFE_UNRETAINED [__nullable])objects
-                              forKeys:(const int64_t [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBInt64ObjectDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param objects      The values to be placed in this dictionary.
@@ -5568,55 +3744,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const BOOL [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolUInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -5712,55 +3839,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const BOOL [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -5856,55 +3934,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const BOOL [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolUInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -6000,55 +4029,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const BOOL [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -6144,55 +4124,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const BOOL [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolBoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -6288,55 +4219,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const BOOL [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolFloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -6432,55 +4314,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const BOOL [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolDoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -6578,70 +4411,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const BOOL [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolEnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -6802,55 +4571,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param object     The value to be placed in the dictionary.
- * @param key        The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithObject:(ObjectType)object
-                              forKey:(BOOL)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param objects      The values to be placed in the dictionary.
- * @param keys         The keys under which to store the values.
- * @param count        The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithObjects:(const ObjectType __nonnull GPB_UNSAFE_UNRETAINED [__nullable])objects
-                              forKeys:(const BOOL [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBBoolObjectDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param objects      The values to be placed in this dictionary.
@@ -6945,55 +4665,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [__nullable])values
-                              forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringUInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7089,55 +4760,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt32s:(const int32_t [__nullable])values
-                             forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringInt32Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7233,55 +4855,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [__nullable])values
-                              forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringUInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7377,55 +4950,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithInt64s:(const int64_t [__nullable])values
-                             forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringInt64Dictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7521,55 +5045,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithBools:(const BOOL [__nullable])values
-                            forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                              count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringBoolDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7665,55 +5140,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithFloats:(const float [__nullable])values
-                             forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                               count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringFloatDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7809,55 +5235,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) NSUInteger count;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param value     The value to be placed in the dictionary.
- * @param key       The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param values      The values to be placed in the dictionary.
- * @param keys        The keys under which to store the values.
- * @param count       The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithDoubles:(const double [__nullable])values
-                              forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                                count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringDoubleDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-
-/**
  * Initializes this dictionary, copying the given values and keys.
  *
  * @param values      The values to be placed in this dictionary.
@@ -7955,70 +5332,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 
 /**
- * @return A newly instanced and empty dictionary.
- **/
-+ (instancetype)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given validation function.
- *
- * @param func The enum validation function for the dictionary.
- *
- * @return A newly instanced dictionary.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-
-/**
- * Creates and initializes a dictionary with the single entry given.
- *
- * @param func     The enum validation function for the dictionary.
- * @param rawValue The raw enum value to be placed in the dictionary.
- * @param key      The key under which to store the value.
- *
- * @return A newly instanced dictionary with the key and value in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(NSString *)key;
-
-/**
- * Creates and initializes a dictionary with the entries given.
- *
- * @param func   The enum validation function for the dictionary.
- * @param values The raw enum values values to be placed in the dictionary.
- * @param keys   The keys under which to store the values.
- * @param count  The number of entries to store in the dictionary.
- *
- * @return A newly instanced dictionary with the keys and values in it.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [__nullable])values
-                                         forKeys:(const NSString * __nonnull GPB_UNSAFE_UNRETAINED [__nullable])keys
-                                           count:(NSUInteger)count;
-
-/**
- * Creates and initializes a dictionary with the entries from the given.
- * dictionary.
- *
- * @param dictionary Dictionary containing the entries to add to the dictionary.
- *
- * @return A newly instanced dictionary with the entries from the given
- *         dictionary in it.
- **/
-+ (instancetype)dictionaryWithDictionary:(GPBStringEnumDictionary *)dictionary;
-
-/**
- * Creates and initializes a dictionary with the given capacity.
- *
- * @param func     The enum validation function for the dictionary.
- * @param numItems Capacity needed for the dictionary.
- *
- * @return A newly instanced dictionary with the given capacity.
- **/
-+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems;
-
-/**
  * Initializes a dictionary with the given validation function.
  *
  * @param func The enum validation function for the dictionary.
@@ -8240,55 +5553,6 @@ NS_ASSUME_NONNULL_END
 //%@property(nonatomic, readonly) NSUInteger count;
 //%
 //%/**
-//% * @return A newly instanced and empty dictionary.
-//% **/
-//%+ (instancetype)dictionary;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the single entry given.
-//% *
-//% * @param ##VNAME_VAR     The value to be placed in the dictionary.
-//% * @param key ##VNAME_VAR$S## The key under which to store the value.
-//% *
-//% * @return A newly instanced dictionary with the key and value in it.
-//% **/
-//%+ (instancetype)dictionaryWith##VNAME##:(VALUE_TYPE)##VNAME_VAR
-//%                       ##VNAME$S## forKey:(KEY_TYPE##KisP$S##KisP)key;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the entries given.
-//% *
-//% * @param ##VNAME_VAR##s      The values to be placed in the dictionary.
-//% * @param keys ##VNAME_VAR$S##  The keys under which to store the values.
-//% * @param count ##VNAME_VAR$S## The number of entries to store in the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the keys and values in it.
-//% **/
-//%+ (instancetype)dictionaryWith##VNAME##s:(const VALUE_TYPE ARRAY_ARG_MODIFIER##VHELPER()[__nullable])##VNAME_VAR##s
-//%                      ##VNAME$S##  forKeys:(const KEY_TYPE##KisP$S##KisP ARRAY_ARG_MODIFIER##KHELPER()[__nullable])keys
-//%                      ##VNAME$S##    count:(NSUInteger)count;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the entries from the given.
-//% * dictionary.
-//% *
-//% * @param dictionary Dictionary containing the entries to add to the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the entries from the given
-//% *         dictionary in it.
-//% **/
-//%+ (instancetype)dictionaryWithDictionary:(GPB##KEY_NAME##VALUE_NAME##Dictionary *)dictionary;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the given capacity.
-//% *
-//% * @param numItems Capacity needed for the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the given capacity.
-//% **/
-//%+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems;
-//%
-//%/**
 //% * Initializes this dictionary, copying the given values and keys.
 //% *
 //% * @param ##VNAME_VAR##s      The values to be placed in this dictionary.
@@ -8353,70 +5617,6 @@ NS_ASSUME_NONNULL_END
 //%@property(nonatomic, readonly) GPBEnumValidationFunc validationFunc;
 //%
 //%/**
-//% * @return A newly instanced and empty dictionary.
-//% **/
-//%+ (instancetype)dictionary;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the given validation function.
-//% *
-//% * @param func The enum validation function for the dictionary.
-//% *
-//% * @return A newly instanced dictionary.
-//% **/
-//%+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the single entry given.
-//% *
-//% * @param func     The enum validation function for the dictionary.
-//% * @param rawValue The raw enum value to be placed in the dictionary.
-//% * @param key      The key under which to store the value.
-//% *
-//% * @return A newly instanced dictionary with the key and value in it.
-//% **/
-//%+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-//%                                        rawValue:(VALUE_TYPE)rawValue
-//%                                          forKey:(KEY_TYPE##KisP$S##KisP)key;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the entries given.
-//% *
-//% * @param func   The enum validation function for the dictionary.
-//% * @param values The raw enum values values to be placed in the dictionary.
-//% * @param keys   The keys under which to store the values.
-//% * @param count  The number of entries to store in the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the keys and values in it.
-//% **/
-//%+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-//%                                       rawValues:(const VALUE_TYPE ARRAY_ARG_MODIFIER##VHELPER()[__nullable])values
-//%                                         forKeys:(const KEY_TYPE##KisP$S##KisP ARRAY_ARG_MODIFIER##KHELPER()[__nullable])keys
-//%                                           count:(NSUInteger)count;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the entries from the given.
-//% * dictionary.
-//% *
-//% * @param dictionary Dictionary containing the entries to add to the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the entries from the given
-//% *         dictionary in it.
-//% **/
-//%+ (instancetype)dictionaryWithDictionary:(GPB##KEY_NAME##VALUE_NAME##Dictionary *)dictionary;
-//%
-//%/**
-//% * Creates and initializes a dictionary with the given capacity.
-//% *
-//% * @param func     The enum validation function for the dictionary.
-//% * @param numItems Capacity needed for the dictionary.
-//% *
-//% * @return A newly instanced dictionary with the given capacity.
-//% **/
-//%+ (instancetype)dictionaryWithValidationFunction:(nullable GPBEnumValidationFunc)func
-//%                                        capacity:(NSUInteger)numItems;
-//%
-//%/**
 //% * Initializes a dictionary with the given validation function.
 //% *
 //% * @param func The enum validation function for the dictionary.
diff --git a/objectivec/GPBDictionary.m b/objectivec/GPBDictionary.m
index 1c67c680..cedf5e54 100644
--- a/objectivec/GPBDictionary.m
+++ b/objectivec/GPBDictionary.m
@@ -329,13 +329,15 @@ static void WriteDictObjectField(GPBCodedOutputStream *stream, id value, uint32_
 
 size_t GPBDictionaryComputeSizeInternalHelper(NSDictionary *dict, GPBFieldDescriptor *field) {
   GPBDataType mapValueType = GPBGetFieldDataType(field);
-  __block size_t result = 0;
-  [dict enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSString *key;
+  NSEnumerator *keys = [dict keyEnumerator];
+  while ((key = [keys nextObject])) {
+    id obj = dict[key];
     size_t msgSize = GPBComputeStringSize(kMapKeyFieldNumber, key);
     msgSize += ComputeDictObjectFieldSize(obj, kMapValueFieldNumber, mapValueType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * dict.count;
   return result;
@@ -347,8 +349,10 @@ void GPBDictionaryWriteToStreamInternalHelper(GPBCodedOutputStream *outputStream
   NSCAssert(field.mapKeyDataType == GPBDataTypeString, @"Unexpected key type");
   GPBDataType mapValueType = GPBGetFieldDataType(field);
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [dict enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
-    #pragma unused(stop)
+  NSString *key;
+  NSEnumerator *keys = [dict keyEnumerator];
+  while ((key = [keys nextObject])) {
+    id obj = dict[key];
     // Write the tag.
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
@@ -359,14 +363,16 @@ void GPBDictionaryWriteToStreamInternalHelper(GPBCodedOutputStream *outputStream
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     [outputStream writeString:kMapKeyFieldNumber value:key];
     WriteDictObjectField(outputStream, obj, kMapValueFieldNumber, mapValueType);
-  }];
+  }
 }
 
 BOOL GPBDictionaryIsInitializedInternalHelper(NSDictionary *dict, GPBFieldDescriptor *field) {
   NSCAssert(field.mapKeyDataType == GPBDataTypeString, @"Unexpected key type");
   NSCAssert(GPBGetFieldDataType(field) == GPBDataTypeMessage, @"Unexpected value type");
   #pragma unused(field)  // For when asserts are off in release.
-  for (GPBMessage *msg in [dict objectEnumerator]) {
+  GPBMessage *msg;
+  NSEnumerator *objects = [dict objectEnumerator];
+  while ((msg = [objects nextObject])) {
     if (!msg.initialized) {
       return NO;
     }
@@ -406,7 +412,7 @@ static void ReadValue(GPBCodedInputStream *stream,
       valueToFill->valueInt32 = GPBCodedInputStreamReadInt32(&stream->state_);
       break;
     case GPBDataTypeInt64:
-      valueToFill->valueInt64 = GPBCodedInputStreamReadInt32(&stream->state_);
+      valueToFill->valueInt64 = GPBCodedInputStreamReadInt64(&stream->state_);
       break;
     case GPBDataTypeSInt32:
       valueToFill->valueInt32 = GPBCodedInputStreamReadSInt32(&stream->state_);
@@ -590,39 +596,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%  NSMutableDictionary *_dictionary;
 //%}
 //%
-//%+ (instancetype)dictionary {
-//%  return [[[self alloc] initWith##VNAME##s:NULL forKeys:NULL count:0] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWith##VNAME##:(VALUE_TYPE)##VNAME_VAR
-//%                      ##VNAME$S##  forKey:(KEY_TYPE##KisP$S##KisP)key {
-//%  // Cast is needed so the compiler knows what class we are invoking initWith##VNAME##s:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWith##VNAME##s:&##VNAME_VAR
-//%               KEY_NAME$S VALUE_NAME$S                        ##VNAME$S##  forKeys:&key
-//%               KEY_NAME$S VALUE_NAME$S                        ##VNAME$S##    count:1] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWith##VNAME##s:(const VALUE_TYPE [])##VNAME_VAR##s
-//%                      ##VNAME$S##  forKeys:(const KEY_TYPE##KisP$S##KisP [])keys
-//%                      ##VNAME$S##    count:(NSUInteger)count {
-//%  // Cast is needed so the compiler knows what class we are invoking initWith##VNAME##s:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWith##VNAME##s:##VNAME_VAR##s
-//%               KEY_NAME$S VALUE_NAME$S                               forKeys:keys
-//%               KEY_NAME$S VALUE_NAME$S                                 count:count] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithDictionary:(GPB##KEY_NAME##VALUE_NAME##Dictionary *)dictionary {
-//%  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-//%  return [[[self alloc] initWithCapacity:numItems] autorelease];
-//%}
-//%
 //%- (instancetype)init {
 //%  return [self initWith##VNAME##s:NULL forKeys:NULL count:0];
 //%}
@@ -679,54 +652,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%
 //%@synthesize validationFunc = _validationFunc;
 //%
-//%+ (instancetype)dictionary {
-//%  return [[[self alloc] initWithValidationFunction:NULL
-//%                                         rawValues:NULL
-//%                                           forKeys:NULL
-//%                                             count:0] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-//%  return [[[self alloc] initWithValidationFunction:func
-//%                                         rawValues:NULL
-//%                                           forKeys:NULL
-//%                                             count:0] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-//%                                        rawValue:(VALUE_TYPE)rawValue
-//%                                          forKey:(KEY_TYPE##KisP$S##KisP)key {
-//%  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWithValidationFunction:func
-//%               KEY_NAME$S VALUE_NAME$S                                         rawValues:&rawValue
-//%               KEY_NAME$S VALUE_NAME$S                                           forKeys:&key
-//%               KEY_NAME$S VALUE_NAME$S                                             count:1] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-//%                                       rawValues:(const VALUE_TYPE [])rawValues
-//%                                         forKeys:(const KEY_TYPE##KisP$S##KisP [])keys
-//%                                           count:(NSUInteger)count {
-//%  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWithValidationFunction:func
-//%               KEY_NAME$S VALUE_NAME$S                                         rawValues:rawValues
-//%               KEY_NAME$S VALUE_NAME$S                                           forKeys:keys
-//%               KEY_NAME$S VALUE_NAME$S                                             count:count] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithDictionary:(GPB##KEY_NAME##VALUE_NAME##Dictionary *)dictionary {
-//%  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPB##KEY_NAME##VALUE_NAME##Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-//%                                        capacity:(NSUInteger)numItems {
-//%  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-//%}
-//%
 //%- (instancetype)init {
 //%  return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 //%}
@@ -796,15 +721,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%- (void)enumerateKeysAndEnumsUsingBlock:
 //%    (void (^)(KEY_TYPE KisP##key, VALUE_TYPE value, BOOL *stop))block {
 //%  GPBEnumValidationFunc func = _validationFunc;
-//%  [_dictionary enumerateKeysAndObjectsUsingBlock:^(ENUM_TYPE##KHELPER(KEY_TYPE)##aKey,
-//%                                                   ENUM_TYPE##VHELPER(VALUE_TYPE)##aValue,
-//%                                                   BOOL *stop) {
+//%  BOOL stop = NO;
+//%  NSEnumerator *keys = [_dictionary keyEnumerator];
+//%  ENUM_TYPE##KHELPER(KEY_TYPE)##aKey;
+//%  while ((aKey = [keys nextObject])) {
+//%    ENUM_TYPE##VHELPER(VALUE_TYPE)##aValue = _dictionary[aKey];
 //%      VALUE_TYPE unwrapped = UNWRAP##VALUE_NAME(aValue);
 //%      if (!func(unwrapped)) {
 //%        unwrapped = kGPBUnrecognizedEnumeratorValue;
 //%      }
-//%      block(UNWRAP##KEY_NAME(aKey), unwrapped, stop);
-//%  }];
+//%    block(UNWRAP##KEY_NAME(aKey), unwrapped, &stop);
+//%    if (stop) {
+//%      break;
+//%    }
+//%  }
 //%}
 //%
 //%DICTIONARY_MUTABLE_CORE2(KEY_NAME, KEY_TYPE, KisP, VALUE_NAME, VALUE_TYPE, KHELPER, VHELPER, Value, Enum, value, Raw)
@@ -863,30 +793,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%
 //%- (void)enumerateKeysAnd##ACCESSOR_NAME##VNAME##sUsingBlock:
 //%    (void (^)(KEY_TYPE KisP##key, VALUE_TYPE VNAME_VAR, BOOL *stop))block {
-//%  [_dictionary enumerateKeysAndObjectsUsingBlock:^(ENUM_TYPE##KHELPER(KEY_TYPE)##aKey,
-//%                                                   ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u,
-//%                                                   BOOL *stop) {
-//%      block(UNWRAP##KEY_NAME(aKey), UNWRAP##VALUE_NAME(a##VNAME_VAR$u), stop);
-//%  }];
+//%  BOOL stop = NO;
+//%  NSDictionary *internal = _dictionary;
+//%  NSEnumerator *keys = [internal keyEnumerator];
+//%  ENUM_TYPE##KHELPER(KEY_TYPE)##aKey;
+//%  while ((aKey = [keys nextObject])) {
+//%    ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u = internal[aKey];
+//%    block(UNWRAP##KEY_NAME(aKey), UNWRAP##VALUE_NAME(a##VNAME_VAR$u), &stop);
+//%    if (stop) {
+//%      break;
+//%    }
+//%  }
 //%}
 //%
 //%EXTRA_METHODS_##VHELPER(KEY_NAME, VALUE_NAME)- (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-//%  NSUInteger count = _dictionary.count;
+//%  NSDictionary *internal = _dictionary;
+//%  NSUInteger count = internal.count;
 //%  if (count == 0) {
 //%    return 0;
 //%  }
 //%
 //%  GPBDataType valueDataType = GPBGetFieldDataType(field);
 //%  GPBDataType keyDataType = field.mapKeyDataType;
-//%  __block size_t result = 0;
-//%  [_dictionary enumerateKeysAndObjectsUsingBlock:^(ENUM_TYPE##KHELPER(KEY_TYPE)##aKey,
-//%                                                   ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u##,
-//%                                                   BOOL *stop) {
-//%    #pragma unused(stop)
+//%  size_t result = 0;
+//%  NSEnumerator *keys = [internal keyEnumerator];
+//%  ENUM_TYPE##KHELPER(KEY_TYPE)##aKey;
+//%  while ((aKey = [keys nextObject])) {
+//%    ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u = internal[aKey];
 //%    size_t msgSize = ComputeDict##KEY_NAME##FieldSize(UNWRAP##KEY_NAME(aKey), kMapKeyFieldNumber, keyDataType);
 //%    msgSize += ComputeDict##VALUE_NAME##FieldSize(UNWRAP##VALUE_NAME(a##VNAME_VAR$u), kMapValueFieldNumber, valueDataType);
 //%    result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-//%  }];
+//%  }
 //%  size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
 //%  result += tagSize * count;
 //%  return result;
@@ -897,20 +834,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%  GPBDataType valueDataType = GPBGetFieldDataType(field);
 //%  GPBDataType keyDataType = field.mapKeyDataType;
 //%  uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-//%  [_dictionary enumerateKeysAndObjectsUsingBlock:^(ENUM_TYPE##KHELPER(KEY_TYPE)##aKey,
-//%                                                   ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u,
-//%                                                   BOOL *stop) {
-//%    #pragma unused(stop)
-//%    // Write the tag.
+//%  NSDictionary *internal = _dictionary;
+//%  NSEnumerator *keys = [internal keyEnumerator];
+//%  ENUM_TYPE##KHELPER(KEY_TYPE)##aKey;
+//%  while ((aKey = [keys nextObject])) {
+//%    ENUM_TYPE##VHELPER(VALUE_TYPE)##a##VNAME_VAR$u = internal[aKey];
 //%    [outputStream writeInt32NoTag:tag];
 //%    // Write the size of the message.
-//%    size_t msgSize = ComputeDict##KEY_NAME##FieldSize(UNWRAP##KEY_NAME(aKey), kMapKeyFieldNumber, keyDataType);
-//%    msgSize += ComputeDict##VALUE_NAME##FieldSize(UNWRAP##VALUE_NAME(a##VNAME_VAR$u), kMapValueFieldNumber, valueDataType);
+//%    KEY_TYPE KisP##unwrappedKey = UNWRAP##KEY_NAME(aKey);
+//%    VALUE_TYPE unwrappedValue = UNWRAP##VALUE_NAME(a##VNAME_VAR$u);
+//%    size_t msgSize = ComputeDict##KEY_NAME##FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+//%    msgSize += ComputeDict##VALUE_NAME##FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
 //%    [outputStream writeInt32NoTag:(int32_t)msgSize];
 //%    // Write the fields.
-//%    WriteDict##KEY_NAME##Field(outputStream, UNWRAP##KEY_NAME(aKey), kMapKeyFieldNumber, keyDataType);
-//%    WriteDict##VALUE_NAME##Field(outputStream, UNWRAP##VALUE_NAME(a##VNAME_VAR$u), kMapValueFieldNumber, valueDataType);
-//%  }];
+//%    WriteDict##KEY_NAME##Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+//%    WriteDict##VALUE_NAME##Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+//%  }
 //%}
 //%
 //%SERIAL_DATA_FOR_ENTRY_##VHELPER(KEY_NAME, VALUE_NAME)- (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -968,39 +907,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%  VALUE_TYPE _values[2];
 //%BOOL_DICT_HAS_STORAGE_##HELPER()}
 //%
-//%+ (instancetype)dictionary {
-//%  return [[[self alloc] initWith##VNAME##s:NULL forKeys:NULL count:0] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWith##VNAME##:(VALUE_TYPE)VNAME_VAR
-//%                      ##VNAME$S##  forKey:(BOOL)key {
-//%  // Cast is needed so the compiler knows what class we are invoking initWith##VNAME##s:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPBBool##VALUE_NAME##Dictionary*)[self alloc] initWith##VNAME##s:&##VNAME_VAR
-//%                    VALUE_NAME$S                        ##VNAME$S##  forKeys:&key
-//%                    VALUE_NAME$S                        ##VNAME$S##    count:1] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWith##VNAME##s:(const VALUE_TYPE [])##VNAME_VAR##s
-//%                      ##VNAME$S##  forKeys:(const BOOL [])keys
-//%                      ##VNAME$S##    count:(NSUInteger)count {
-//%  // Cast is needed so the compiler knows what class we are invoking initWith##VNAME##s:forKeys:count:
-//%  // on to get the type correct.
-//%  return [[(GPBBool##VALUE_NAME##Dictionary*)[self alloc] initWith##VNAME##s:##VNAME_VAR##s
-//%                    VALUE_NAME$S                        ##VNAME$S##  forKeys:keys
-//%                    VALUE_NAME$S                        ##VNAME$S##    count:count] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithDictionary:(GPBBool##VALUE_NAME##Dictionary *)dictionary {
-//%  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-//%  // on to get the type correct.
-//%  return [[(GPBBool##VALUE_NAME##Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-//%}
-//%
-//%+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-//%  return [[[self alloc] initWithCapacity:numItems] autorelease];
-//%}
-//%
 //%- (instancetype)init {
 //%  return [self initWith##VNAME##s:NULL forKeys:NULL count:0];
 //%}
@@ -1366,14 +1272,15 @@ void GPBDictionaryReadEntry(id mapDictionary,
 //%- (instancetype)deepCopyWithZone:(NSZone *)zone {
 //%  GPB##KEY_NAME##VALUE_NAME##Dictionary *newDict =
 //%      [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] init];
-//%  [_dictionary enumerateKeysAndObjectsUsingBlock:^(id aKey,
-//%                                                   GPBMessage *msg,
-//%                                                   BOOL *stop) {
-//%    #pragma unused(stop)
+//%  NSEnumerator *keys = [_dictionary keyEnumerator];
+//%  id aKey;
+//%  NSMutableDictionary *internalDict = newDict->_dictionary;
+//%  while ((aKey = [keys nextObject])) {
+//%    GPBMessage *msg = _dictionary[aKey];
 //%    GPBMessage *copiedMsg = [msg copyWithZone:zone];
-//%    [newDict->_dictionary setObject:copiedMsg forKey:aKey];
+//%    [internalDict setObject:copiedMsg forKey:aKey];
 //%    [copiedMsg release];
-//%  }];
+//%  }
 //%  return newDict;
 //%}
 //%
@@ -1528,39 +1435,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const uint32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32UInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -1632,30 +1506,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt32sUsingBlock:
     (void (^)(uint32_t key, uint32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue unsignedIntValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue unsignedIntValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -1666,20 +1547,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    uint32_t unwrappedValue = [aValue unsignedIntValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt32Field(outputStream, [aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -1735,39 +1618,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32Int32Dictionary*)[self alloc] initWithInt32s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const uint32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32Int32Dictionary*)[self alloc] initWithInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32Int32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32Int32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -1839,30 +1689,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt32sUsingBlock:
     (void (^)(uint32_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -1873,20 +1730,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt32Field(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -1942,39 +1801,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const uint32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32UInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32UInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -2046,30 +1872,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt64sUsingBlock:
     (void (^)(uint32_t key, uint64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue unsignedLongLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue unsignedLongLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -2080,20 +1913,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    uint64_t unwrappedValue = [aValue unsignedLongLongValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt64Field(outputStream, [aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -2149,39 +1984,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32Int64Dictionary*)[self alloc] initWithInt64s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const uint32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32Int64Dictionary*)[self alloc] initWithInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32Int64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32Int64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -2253,30 +2055,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt64sUsingBlock:
     (void (^)(uint32_t key, int64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue longLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue longLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -2287,20 +2096,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    int64_t unwrappedValue = [aValue longLongValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt64Field(outputStream, [aValue longLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -2356,39 +2167,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32BoolDictionary*)[self alloc] initWithBools:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const uint32_t [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32BoolDictionary*)[self alloc] initWithBools:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32BoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32BoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -2460,30 +2238,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndBoolsUsingBlock:
     (void (^)(uint32_t key, BOOL value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue boolValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue boolValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -2494,20 +2279,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    BOOL unwrappedValue = [aValue boolValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictBoolFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictBoolField(outputStream, [aValue boolValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictBoolField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -2563,39 +2350,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32FloatDictionary*)[self alloc] initWithFloats:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const uint32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32FloatDictionary*)[self alloc] initWithFloats:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32FloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32FloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -2667,30 +2421,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndFloatsUsingBlock:
     (void (^)(uint32_t key, float value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue floatValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue floatValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -2701,20 +2462,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    float unwrappedValue = [aValue floatValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictFloatFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictFloatField(outputStream, [aValue floatValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictFloatField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -2770,39 +2533,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32DoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const uint32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32DoubleDictionary*)[self alloc] initWithDoubles:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32DoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32DoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -2874,30 +2604,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndDoublesUsingBlock:
     (void (^)(uint32_t key, double value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue doubleValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue doubleValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -2908,20 +2645,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    double unwrappedValue = [aValue doubleValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictDoubleFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictDoubleField(outputStream, [aValue doubleValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictDoubleField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -2980,54 +2719,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:&rawValue
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])rawValues
-                                         forKeys:(const uint32_t [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:rawValues
-                                                                     forKeys:keys
-                                                                       count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32EnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32EnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -3109,30 +2800,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndRawValuesUsingBlock:
     (void (^)(uint32_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedIntValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -3143,20 +2841,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictEnumFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictEnumField(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictEnumField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (NSData *)serializedDataForUnknownValue:(int32_t)value
@@ -3206,15 +2906,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (void)enumerateKeysAndEnumsUsingBlock:
     (void (^)(uint32_t key, int32_t value, BOOL *stop))block {
   GPBEnumValidationFunc func = _validationFunc;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
+  BOOL stop = NO;
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = _dictionary[aKey];
       int32_t unwrapped = [aValue intValue];
       if (!func(unwrapped)) {
         unwrapped = kGPBUnrecognizedEnumeratorValue;
       }
-      block([aKey unsignedIntValue], unwrapped, stop);
-  }];
+    block([aKey unsignedIntValue], unwrapped, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (void)addRawEntriesFromDictionary:(GPBUInt32EnumDictionary *)otherDictionary {
@@ -3263,39 +2968,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithObjects:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithObject:(id)object
-                              forKey:(uint32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32ObjectDictionary*)[self alloc] initWithObjects:&object
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithObjects:(const id [])objects
-                              forKeys:(const uint32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt32ObjectDictionary*)[self alloc] initWithObjects:objects
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt32ObjectDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt32ObjectDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithObjects:NULL forKeys:NULL count:0];
 }
@@ -3371,11 +3043,17 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndObjectsUsingBlock:
     (void (^)(uint32_t key, id object, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-      block([aKey unsignedIntValue], aObject, stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
+    block([aKey unsignedIntValue], aObject, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (BOOL)isInitialized {
@@ -3390,34 +3068,36 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (instancetype)deepCopyWithZone:(NSZone *)zone {
   GPBUInt32ObjectDictionary *newDict =
       [[GPBUInt32ObjectDictionary alloc] init];
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(id aKey,
-                                                   GPBMessage *msg,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  id aKey;
+  NSMutableDictionary *internalDict = newDict->_dictionary;
+  while ((aKey = [keys nextObject])) {
+    GPBMessage *msg = _dictionary[aKey];
     GPBMessage *copiedMsg = [msg copyWithZone:zone];
-    [newDict->_dictionary setObject:copiedMsg forKey:aKey];
+    [internalDict setObject:copiedMsg forKey:aKey];
     [copiedMsg release];
-  }];
+  }
   return newDict;
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -3428,20 +3108,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt32FieldSize([aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
+    uint32_t unwrappedKey = [aKey unsignedIntValue];
+    id unwrappedValue = aObject;
+    size_t msgSize = ComputeDictUInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictObjectFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt32Field(outputStream, [aKey unsignedIntValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictObjectField(outputStream, aObject, kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictObjectField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -3501,39 +3183,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32UInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const int32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32UInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32UInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32UInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -3605,30 +3254,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt32sUsingBlock:
     (void (^)(int32_t key, uint32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue unsignedIntValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue unsignedIntValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -3639,20 +3295,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    uint32_t unwrappedValue = [aValue unsignedIntValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt32Field(outputStream, [aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -3708,39 +3366,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32Int32Dictionary*)[self alloc] initWithInt32s:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const int32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32Int32Dictionary*)[self alloc] initWithInt32s:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32Int32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32Int32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -3812,30 +3437,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt32sUsingBlock:
     (void (^)(int32_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -3846,20 +3478,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt32Field(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -3915,39 +3549,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32UInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const int32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32UInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32UInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32UInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -4019,30 +3620,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt64sUsingBlock:
     (void (^)(int32_t key, uint64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue unsignedLongLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue unsignedLongLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -4053,20 +3661,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    uint64_t unwrappedValue = [aValue unsignedLongLongValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt64Field(outputStream, [aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -4122,39 +3732,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32Int64Dictionary*)[self alloc] initWithInt64s:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const int32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32Int64Dictionary*)[self alloc] initWithInt64s:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32Int64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32Int64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -4226,30 +3803,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt64sUsingBlock:
     (void (^)(int32_t key, int64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue longLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue longLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -4260,20 +3844,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    int64_t unwrappedValue = [aValue longLongValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt64Field(outputStream, [aValue longLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -4329,39 +3915,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32BoolDictionary*)[self alloc] initWithBools:&value
-                                                       forKeys:&key
-                                                         count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const int32_t [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32BoolDictionary*)[self alloc] initWithBools:values
-                                                        forKeys:keys
-                                                          count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32BoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32BoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -4433,30 +3986,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndBoolsUsingBlock:
     (void (^)(int32_t key, BOOL value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue boolValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue boolValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -4467,20 +4027,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    BOOL unwrappedValue = [aValue boolValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictBoolFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictBoolField(outputStream, [aValue boolValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictBoolField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -4536,39 +4098,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32FloatDictionary*)[self alloc] initWithFloats:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const int32_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32FloatDictionary*)[self alloc] initWithFloats:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32FloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32FloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -4640,30 +4169,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndFloatsUsingBlock:
     (void (^)(int32_t key, float value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue floatValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue floatValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -4674,20 +4210,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    float unwrappedValue = [aValue floatValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictFloatFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictFloatField(outputStream, [aValue floatValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictFloatField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -4743,39 +4281,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32DoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const int32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32DoubleDictionary*)[self alloc] initWithDoubles:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32DoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32DoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -4847,30 +4352,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndDoublesUsingBlock:
     (void (^)(int32_t key, double value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue doubleValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue doubleValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -4881,20 +4393,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    double unwrappedValue = [aValue doubleValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictDoubleFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictDoubleField(outputStream, [aValue doubleValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictDoubleField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -4953,54 +4467,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                  rawValues:&rawValue
-                                                                    forKeys:&key
-                                                                      count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])rawValues
-                                         forKeys:(const int32_t [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                  rawValues:rawValues
-                                                                    forKeys:keys
-                                                                      count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32EnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32EnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -5082,30 +4548,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndRawValuesUsingBlock:
     (void (^)(int32_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey intValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey intValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -5116,20 +4589,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictEnumFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictEnumField(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictEnumField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (NSData *)serializedDataForUnknownValue:(int32_t)value
@@ -5179,15 +4654,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (void)enumerateKeysAndEnumsUsingBlock:
     (void (^)(int32_t key, int32_t value, BOOL *stop))block {
   GPBEnumValidationFunc func = _validationFunc;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
+  BOOL stop = NO;
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = _dictionary[aKey];
       int32_t unwrapped = [aValue intValue];
       if (!func(unwrapped)) {
         unwrapped = kGPBUnrecognizedEnumeratorValue;
       }
-      block([aKey intValue], unwrapped, stop);
-  }];
+    block([aKey intValue], unwrapped, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (void)addRawEntriesFromDictionary:(GPBInt32EnumDictionary *)otherDictionary {
@@ -5236,39 +4716,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithObjects:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithObject:(id)object
-                              forKey:(int32_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32ObjectDictionary*)[self alloc] initWithObjects:&object
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithObjects:(const id [])objects
-                              forKeys:(const int32_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt32ObjectDictionary*)[self alloc] initWithObjects:objects
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt32ObjectDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt32ObjectDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithObjects:NULL forKeys:NULL count:0];
 }
@@ -5344,11 +4791,17 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndObjectsUsingBlock:
     (void (^)(int32_t key, id object, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-      block([aKey intValue], aObject, stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
+    block([aKey intValue], aObject, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (BOOL)isInitialized {
@@ -5363,34 +4816,36 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (instancetype)deepCopyWithZone:(NSZone *)zone {
   GPBInt32ObjectDictionary *newDict =
       [[GPBInt32ObjectDictionary alloc] init];
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(id aKey,
-                                                   GPBMessage *msg,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  id aKey;
+  NSMutableDictionary *internalDict = newDict->_dictionary;
+  while ((aKey = [keys nextObject])) {
+    GPBMessage *msg = _dictionary[aKey];
     GPBMessage *copiedMsg = [msg copyWithZone:zone];
-    [newDict->_dictionary setObject:copiedMsg forKey:aKey];
+    [internalDict setObject:copiedMsg forKey:aKey];
     [copiedMsg release];
-  }];
+  }
   return newDict;
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -5401,20 +4856,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt32FieldSize([aKey intValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
+    int32_t unwrappedKey = [aKey intValue];
+    id unwrappedValue = aObject;
+    size_t msgSize = ComputeDictInt32FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictObjectFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt32Field(outputStream, [aKey intValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictObjectField(outputStream, aObject, kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt32Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictObjectField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -5474,39 +4931,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const uint64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64UInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -5578,30 +5002,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt32sUsingBlock:
     (void (^)(uint64_t key, uint32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue unsignedIntValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue unsignedIntValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -5612,20 +5043,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    uint32_t unwrappedValue = [aValue unsignedIntValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt32Field(outputStream, [aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -5681,39 +5114,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64Int32Dictionary*)[self alloc] initWithInt32s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const uint64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64Int32Dictionary*)[self alloc] initWithInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64Int32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64Int32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -5785,30 +5185,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt32sUsingBlock:
     (void (^)(uint64_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -5819,20 +5226,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt32Field(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -5888,39 +5297,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const uint64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64UInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64UInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -5992,30 +5368,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt64sUsingBlock:
     (void (^)(uint64_t key, uint64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue unsignedLongLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue unsignedLongLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -6026,20 +5409,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    uint64_t unwrappedValue = [aValue unsignedLongLongValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt64Field(outputStream, [aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -6095,39 +5480,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64Int64Dictionary*)[self alloc] initWithInt64s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const uint64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64Int64Dictionary*)[self alloc] initWithInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64Int64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64Int64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -6199,30 +5551,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt64sUsingBlock:
     (void (^)(uint64_t key, int64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue longLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue longLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -6233,20 +5592,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    int64_t unwrappedValue = [aValue longLongValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt64Field(outputStream, [aValue longLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -6302,39 +5663,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64BoolDictionary*)[self alloc] initWithBools:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const uint64_t [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64BoolDictionary*)[self alloc] initWithBools:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64BoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64BoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -6406,30 +5734,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndBoolsUsingBlock:
     (void (^)(uint64_t key, BOOL value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue boolValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue boolValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -6440,20 +5775,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    BOOL unwrappedValue = [aValue boolValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictBoolFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictBoolField(outputStream, [aValue boolValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictBoolField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -6509,39 +5846,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64FloatDictionary*)[self alloc] initWithFloats:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const uint64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64FloatDictionary*)[self alloc] initWithFloats:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64FloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64FloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -6613,30 +5917,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndFloatsUsingBlock:
     (void (^)(uint64_t key, float value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue floatValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue floatValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -6647,20 +5958,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    float unwrappedValue = [aValue floatValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictFloatFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictFloatField(outputStream, [aValue floatValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictFloatField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -6716,39 +6029,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64DoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const uint64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64DoubleDictionary*)[self alloc] initWithDoubles:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64DoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64DoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -6820,30 +6100,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndDoublesUsingBlock:
     (void (^)(uint64_t key, double value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue doubleValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue doubleValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -6854,20 +6141,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    double unwrappedValue = [aValue doubleValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictDoubleFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictDoubleField(outputStream, [aValue doubleValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictDoubleField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -6926,54 +6215,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:&rawValue
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])rawValues
-                                         forKeys:(const uint64_t [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:rawValues
-                                                                     forKeys:keys
-                                                                       count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64EnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64EnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -7055,30 +6296,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndRawValuesUsingBlock:
     (void (^)(uint64_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey unsignedLongLongValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -7089,20 +6337,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictEnumFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictEnumField(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictEnumField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (NSData *)serializedDataForUnknownValue:(int32_t)value
@@ -7152,15 +6402,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (void)enumerateKeysAndEnumsUsingBlock:
     (void (^)(uint64_t key, int32_t value, BOOL *stop))block {
   GPBEnumValidationFunc func = _validationFunc;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
+  BOOL stop = NO;
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = _dictionary[aKey];
       int32_t unwrapped = [aValue intValue];
       if (!func(unwrapped)) {
         unwrapped = kGPBUnrecognizedEnumeratorValue;
       }
-      block([aKey unsignedLongLongValue], unwrapped, stop);
-  }];
+    block([aKey unsignedLongLongValue], unwrapped, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (void)addRawEntriesFromDictionary:(GPBUInt64EnumDictionary *)otherDictionary {
@@ -7209,39 +6464,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithObjects:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithObject:(id)object
-                              forKey:(uint64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64ObjectDictionary*)[self alloc] initWithObjects:&object
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithObjects:(const id [])objects
-                              forKeys:(const uint64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBUInt64ObjectDictionary*)[self alloc] initWithObjects:objects
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBUInt64ObjectDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBUInt64ObjectDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithObjects:NULL forKeys:NULL count:0];
 }
@@ -7317,11 +6539,17 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndObjectsUsingBlock:
     (void (^)(uint64_t key, id object, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-      block([aKey unsignedLongLongValue], aObject, stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
+    block([aKey unsignedLongLongValue], aObject, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (BOOL)isInitialized {
@@ -7336,34 +6564,36 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (instancetype)deepCopyWithZone:(NSZone *)zone {
   GPBUInt64ObjectDictionary *newDict =
       [[GPBUInt64ObjectDictionary alloc] init];
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(id aKey,
-                                                   GPBMessage *msg,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  id aKey;
+  NSMutableDictionary *internalDict = newDict->_dictionary;
+  while ((aKey = [keys nextObject])) {
+    GPBMessage *msg = _dictionary[aKey];
     GPBMessage *copiedMsg = [msg copyWithZone:zone];
-    [newDict->_dictionary setObject:copiedMsg forKey:aKey];
+    [internalDict setObject:copiedMsg forKey:aKey];
     [copiedMsg release];
-  }];
+  }
   return newDict;
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -7374,20 +6604,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictUInt64FieldSize([aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
+    uint64_t unwrappedKey = [aKey unsignedLongLongValue];
+    id unwrappedValue = aObject;
+    size_t msgSize = ComputeDictUInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictObjectFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictUInt64Field(outputStream, [aKey unsignedLongLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictObjectField(outputStream, aObject, kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictUInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictObjectField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -7447,39 +6679,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64UInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const int64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64UInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64UInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64UInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -7551,30 +6750,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt32sUsingBlock:
     (void (^)(int64_t key, uint32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue unsignedIntValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue unsignedIntValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -7585,20 +6791,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    uint32_t unwrappedValue = [aValue unsignedIntValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt32Field(outputStream, [aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -7654,39 +6862,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64Int32Dictionary*)[self alloc] initWithInt32s:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const int64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64Int32Dictionary*)[self alloc] initWithInt32s:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64Int32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64Int32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -7758,30 +6933,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt32sUsingBlock:
     (void (^)(int64_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -7792,20 +6974,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt32Field(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -7861,39 +7045,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64UInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const int64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64UInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64UInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64UInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -7965,30 +7116,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt64sUsingBlock:
     (void (^)(int64_t key, uint64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue unsignedLongLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue unsignedLongLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -7999,20 +7157,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    uint64_t unwrappedValue = [aValue unsignedLongLongValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt64Field(outputStream, [aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -8068,39 +7228,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64Int64Dictionary*)[self alloc] initWithInt64s:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const int64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64Int64Dictionary*)[self alloc] initWithInt64s:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64Int64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64Int64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -8172,30 +7299,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt64sUsingBlock:
     (void (^)(int64_t key, int64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue longLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue longLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -8206,20 +7340,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    int64_t unwrappedValue = [aValue longLongValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictInt64Field(outputStream, [aValue longLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -8275,39 +7411,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64BoolDictionary*)[self alloc] initWithBools:&value
-                                                       forKeys:&key
-                                                         count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const int64_t [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64BoolDictionary*)[self alloc] initWithBools:values
-                                                        forKeys:keys
-                                                          count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64BoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64BoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -8379,30 +7482,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndBoolsUsingBlock:
     (void (^)(int64_t key, BOOL value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue boolValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue boolValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -8413,20 +7523,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    BOOL unwrappedValue = [aValue boolValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictBoolFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictBoolField(outputStream, [aValue boolValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictBoolField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -8482,39 +7594,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64FloatDictionary*)[self alloc] initWithFloats:&value
-                                                         forKeys:&key
-                                                           count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const int64_t [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64FloatDictionary*)[self alloc] initWithFloats:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64FloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64FloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -8586,30 +7665,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndFloatsUsingBlock:
     (void (^)(int64_t key, float value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue floatValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue floatValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -8620,20 +7706,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    float unwrappedValue = [aValue floatValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictFloatFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictFloatField(outputStream, [aValue floatValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictFloatField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -8689,39 +7777,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64DoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const int64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64DoubleDictionary*)[self alloc] initWithDoubles:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64DoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64DoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -8793,30 +7848,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndDoublesUsingBlock:
     (void (^)(int64_t key, double value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue doubleValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue doubleValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -8827,20 +7889,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    double unwrappedValue = [aValue doubleValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictDoubleFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictDoubleField(outputStream, [aValue doubleValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictDoubleField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -8899,54 +7963,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                  rawValues:&rawValue
-                                                                    forKeys:&key
-                                                                      count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])rawValues
-                                         forKeys:(const int64_t [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64EnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                  rawValues:rawValues
-                                                                    forKeys:keys
-                                                                      count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64EnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64EnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -9028,30 +8044,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndRawValuesUsingBlock:
     (void (^)(int64_t key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block([aKey longLongValue], [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -9062,20 +8085,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictEnumFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictEnumField(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictEnumField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (NSData *)serializedDataForUnknownValue:(int32_t)value
@@ -9125,15 +8150,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (void)enumerateKeysAndEnumsUsingBlock:
     (void (^)(int64_t key, int32_t value, BOOL *stop))block {
   GPBEnumValidationFunc func = _validationFunc;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
+  BOOL stop = NO;
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = _dictionary[aKey];
       int32_t unwrapped = [aValue intValue];
       if (!func(unwrapped)) {
         unwrapped = kGPBUnrecognizedEnumeratorValue;
       }
-      block([aKey longLongValue], unwrapped, stop);
-  }];
+    block([aKey longLongValue], unwrapped, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (void)addRawEntriesFromDictionary:(GPBInt64EnumDictionary *)otherDictionary {
@@ -9182,39 +8212,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithObjects:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithObject:(id)object
-                              forKey:(int64_t)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64ObjectDictionary*)[self alloc] initWithObjects:&object
-                                                           forKeys:&key
-                                                             count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithObjects:(const id [])objects
-                              forKeys:(const int64_t [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBInt64ObjectDictionary*)[self alloc] initWithObjects:objects
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBInt64ObjectDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBInt64ObjectDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithObjects:NULL forKeys:NULL count:0];
 }
@@ -9290,11 +8287,17 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndObjectsUsingBlock:
     (void (^)(int64_t key, id object, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-      block([aKey longLongValue], aObject, stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
+    block([aKey longLongValue], aObject, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (BOOL)isInitialized {
@@ -9309,34 +8312,36 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (instancetype)deepCopyWithZone:(NSZone *)zone {
   GPBInt64ObjectDictionary *newDict =
       [[GPBInt64ObjectDictionary alloc] init];
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(id aKey,
-                                                   GPBMessage *msg,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  id aKey;
+  NSMutableDictionary *internalDict = newDict->_dictionary;
+  while ((aKey = [keys nextObject])) {
+    GPBMessage *msg = _dictionary[aKey];
     GPBMessage *copiedMsg = [msg copyWithZone:zone];
-    [newDict->_dictionary setObject:copiedMsg forKey:aKey];
+    [internalDict setObject:copiedMsg forKey:aKey];
     [copiedMsg release];
-  }];
+  }
   return newDict;
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -9347,20 +8352,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSNumber *aKey,
-                                                   id aObject,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSNumber *aKey;
+  while ((aKey = [keys nextObject])) {
+    id aObject = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictInt64FieldSize([aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictObjectFieldSize(aObject, kMapValueFieldNumber, valueDataType);
+    int64_t unwrappedKey = [aKey longLongValue];
+    id unwrappedValue = aObject;
+    size_t msgSize = ComputeDictInt64FieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictObjectFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictInt64Field(outputStream, [aKey longLongValue], kMapKeyFieldNumber, keyDataType);
-    WriteDictObjectField(outputStream, aObject, kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictInt64Field(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictObjectField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -9420,39 +8427,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringUInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const NSString * [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringUInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringUInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringUInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -9528,30 +8502,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt32sUsingBlock:
     (void (^)(NSString *key, uint32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue unsignedIntValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue unsignedIntValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -9562,20 +8543,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt32FieldSize([aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    uint32_t unwrappedValue = [aValue unsignedIntValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt32Field(outputStream, [aValue unsignedIntValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -9635,39 +8618,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringInt32Dictionary*)[self alloc] initWithInt32s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const NSString * [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringInt32Dictionary*)[self alloc] initWithInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -9743,30 +8693,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt32sUsingBlock:
     (void (^)(NSString *key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -9777,20 +8734,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt32FieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt32FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictInt32Field(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt32Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -9850,39 +8809,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringUInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const NSString * [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringUInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringUInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringUInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -9958,30 +8884,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndUInt64sUsingBlock:
     (void (^)(NSString *key, uint64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue unsignedLongLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue unsignedLongLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -9992,20 +8925,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictUInt64FieldSize([aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    uint64_t unwrappedValue = [aValue unsignedLongLongValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictUInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictUInt64Field(outputStream, [aValue unsignedLongLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictUInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -10065,39 +9000,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringInt64Dictionary*)[self alloc] initWithInt64s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const NSString * [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringInt64Dictionary*)[self alloc] initWithInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -10173,30 +9075,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndInt64sUsingBlock:
     (void (^)(NSString *key, int64_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue longLongValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue longLongValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -10207,20 +9116,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictInt64FieldSize([aValue longLongValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    int64_t unwrappedValue = [aValue longLongValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictInt64FieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictInt64Field(outputStream, [aValue longLongValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictInt64Field(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -10280,39 +9191,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringBoolDictionary*)[self alloc] initWithBools:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const NSString * [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringBoolDictionary*)[self alloc] initWithBools:values
-                                                         forKeys:keys
-                                                           count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringBoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringBoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -10388,30 +9266,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndBoolsUsingBlock:
     (void (^)(NSString *key, BOOL value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue boolValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue boolValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -10422,20 +9307,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictBoolFieldSize([aValue boolValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    BOOL unwrappedValue = [aValue boolValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictBoolFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictBoolField(outputStream, [aValue boolValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictBoolField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -10495,39 +9382,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringFloatDictionary*)[self alloc] initWithFloats:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const NSString * [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringFloatDictionary*)[self alloc] initWithFloats:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringFloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringFloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -10603,30 +9457,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndFloatsUsingBlock:
     (void (^)(NSString *key, float value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue floatValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue floatValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -10637,20 +9498,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictFloatFieldSize([aValue floatValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    float unwrappedValue = [aValue floatValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictFloatFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictFloatField(outputStream, [aValue floatValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictFloatField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -10710,39 +9573,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   NSMutableDictionary *_dictionary;
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringDoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                            forKeys:&key
-                                                              count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const NSString * [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringDoubleDictionary*)[self alloc] initWithDoubles:values
-                                                           forKeys:keys
-                                                             count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringDoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBStringDoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -10818,30 +9648,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndDoublesUsingBlock:
     (void (^)(NSString *key, double value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue doubleValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue doubleValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -10852,20 +9689,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictDoubleFieldSize([aValue doubleValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    double unwrappedValue = [aValue doubleValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictDoubleFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictDoubleField(outputStream, [aValue doubleValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictDoubleField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (void)setGPBGenericValue:(GPBGenericValue *)value
@@ -10928,54 +9767,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        rawValue:(int32_t)rawValue
-                                          forKey:(NSString *)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringEnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:&rawValue
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])rawValues
-                                         forKeys:(const NSString * [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringEnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                   rawValues:rawValues
-                                                                     forKeys:keys
-                                                                       count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBStringEnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBStringEnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -11061,30 +9852,37 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 - (void)enumerateKeysAndRawValuesUsingBlock:
     (void (^)(NSString *key, int32_t value, BOOL *stop))block {
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-      block(aKey, [aValue intValue], stop);
-  }];
+  BOOL stop = NO;
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
+    block(aKey, [aValue intValue], &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (size_t)computeSerializedSizeAsField:(GPBFieldDescriptor *)field {
-  NSUInteger count = _dictionary.count;
+  NSDictionary *internal = _dictionary;
+  NSUInteger count = internal.count;
   if (count == 0) {
     return 0;
   }
 
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
-  __block size_t result = 0;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
+  size_t result = 0;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
     msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
     result += GPBComputeRawVarint32SizeForInteger(msgSize) + msgSize;
-  }];
+  }
   size_t tagSize = GPBComputeWireFormatTagSize(GPBFieldNumber(field), GPBDataTypeMessage);
   result += tagSize * count;
   return result;
@@ -11095,20 +9893,22 @@ void GPBDictionaryReadEntry(id mapDictionary,
   GPBDataType valueDataType = GPBGetFieldDataType(field);
   GPBDataType keyDataType = field.mapKeyDataType;
   uint32_t tag = GPBWireFormatMakeTag(GPBFieldNumber(field), GPBWireFormatLengthDelimited);
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
-    #pragma unused(stop)
-    // Write the tag.
+  NSDictionary *internal = _dictionary;
+  NSEnumerator *keys = [internal keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = internal[aKey];
     [outputStream writeInt32NoTag:tag];
     // Write the size of the message.
-    size_t msgSize = ComputeDictStringFieldSize(aKey, kMapKeyFieldNumber, keyDataType);
-    msgSize += ComputeDictEnumFieldSize([aValue intValue], kMapValueFieldNumber, valueDataType);
+    NSString *unwrappedKey = aKey;
+    int32_t unwrappedValue = [aValue intValue];
+    size_t msgSize = ComputeDictStringFieldSize(unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    msgSize += ComputeDictEnumFieldSize(unwrappedValue, kMapValueFieldNumber, valueDataType);
     [outputStream writeInt32NoTag:(int32_t)msgSize];
     // Write the fields.
-    WriteDictStringField(outputStream, aKey, kMapKeyFieldNumber, keyDataType);
-    WriteDictEnumField(outputStream, [aValue intValue], kMapValueFieldNumber, valueDataType);
-  }];
+    WriteDictStringField(outputStream, unwrappedKey, kMapKeyFieldNumber, keyDataType);
+    WriteDictEnumField(outputStream, unwrappedValue, kMapValueFieldNumber, valueDataType);
+  }
 }
 
 - (NSData *)serializedDataForUnknownValue:(int32_t)value
@@ -11158,15 +9958,20 @@ void GPBDictionaryReadEntry(id mapDictionary,
 - (void)enumerateKeysAndEnumsUsingBlock:
     (void (^)(NSString *key, int32_t value, BOOL *stop))block {
   GPBEnumValidationFunc func = _validationFunc;
-  [_dictionary enumerateKeysAndObjectsUsingBlock:^(NSString *aKey,
-                                                   NSNumber *aValue,
-                                                   BOOL *stop) {
+  BOOL stop = NO;
+  NSEnumerator *keys = [_dictionary keyEnumerator];
+  NSString *aKey;
+  while ((aKey = [keys nextObject])) {
+    NSNumber *aValue = _dictionary[aKey];
       int32_t unwrapped = [aValue intValue];
       if (!func(unwrapped)) {
         unwrapped = kGPBUnrecognizedEnumeratorValue;
       }
-      block(aKey, unwrapped, stop);
-  }];
+    block(aKey, unwrapped, &stop);
+    if (stop) {
+      break;
+    }
+  }
 }
 
 - (void)addRawEntriesFromDictionary:(GPBStringEnumDictionary *)otherDictionary {
@@ -11230,39 +10035,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32:(uint32_t)value
-                              forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolUInt32Dictionary*)[self alloc] initWithUInt32s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt32s:(const uint32_t [])values
-                              forKeys:(const BOOL [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolUInt32Dictionary*)[self alloc] initWithUInt32s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolUInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolUInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt32s:NULL forKeys:NULL count:0];
 }
@@ -11472,39 +10244,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt32s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32:(int32_t)value
-                             forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolInt32Dictionary*)[self alloc] initWithInt32s:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt32s:(const int32_t [])values
-                             forKeys:(const BOOL [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt32s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolInt32Dictionary*)[self alloc] initWithInt32s:values
-                                                        forKeys:keys
-                                                          count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolInt32Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolInt32Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt32s:NULL forKeys:NULL count:0];
 }
@@ -11714,39 +10453,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithUInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64:(uint64_t)value
-                              forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolUInt64Dictionary*)[self alloc] initWithUInt64s:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithUInt64s:(const uint64_t [])values
-                              forKeys:(const BOOL [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithUInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolUInt64Dictionary*)[self alloc] initWithUInt64s:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolUInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolUInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithUInt64s:NULL forKeys:NULL count:0];
 }
@@ -11956,39 +10662,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithInt64s:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64:(int64_t)value
-                             forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolInt64Dictionary*)[self alloc] initWithInt64s:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithInt64s:(const int64_t [])values
-                             forKeys:(const BOOL [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithInt64s:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolInt64Dictionary*)[self alloc] initWithInt64s:values
-                                                        forKeys:keys
-                                                          count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolInt64Dictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolInt64Dictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithInt64s:NULL forKeys:NULL count:0];
 }
@@ -12198,39 +10871,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithBools:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithBool:(BOOL)value
-                            forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolBoolDictionary*)[self alloc] initWithBools:&value
-                                                      forKeys:&key
-                                                        count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithBools:(const BOOL [])values
-                            forKeys:(const BOOL [])keys
-                              count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithBools:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolBoolDictionary*)[self alloc] initWithBools:values
-                                                      forKeys:keys
-                                                        count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolBoolDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolBoolDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithBools:NULL forKeys:NULL count:0];
 }
@@ -12440,39 +11080,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithFloats:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloat:(float)value
-                             forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolFloatDictionary*)[self alloc] initWithFloats:&value
-                                                        forKeys:&key
-                                                          count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithFloats:(const float [])values
-                             forKeys:(const BOOL [])keys
-                               count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithFloats:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolFloatDictionary*)[self alloc] initWithFloats:values
-                                                        forKeys:keys
-                                                          count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolFloatDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolFloatDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithFloats:NULL forKeys:NULL count:0];
 }
@@ -12682,39 +11289,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   BOOL _valueSet[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithDoubles:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithDouble:(double)value
-                              forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolDoubleDictionary*)[self alloc] initWithDoubles:&value
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithDoubles:(const double [])values
-                              forKeys:(const BOOL [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithDoubles:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolDoubleDictionary*)[self alloc] initWithDoubles:values
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolDoubleDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolDoubleDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithDoubles:NULL forKeys:NULL count:0];
 }
@@ -12923,39 +11497,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
   id _values[2];
 }
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithObjects:NULL forKeys:NULL count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithObject:(id)object
-                              forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolObjectDictionary*)[self alloc] initWithObjects:&object
-                                                          forKeys:&key
-                                                            count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithObjects:(const id [])objects
-                              forKeys:(const BOOL [])keys
-                                count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithObjects:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolObjectDictionary*)[self alloc] initWithObjects:objects
-                                                          forKeys:keys
-                                                            count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolObjectDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithDictionary:
-  // on to get the type correct.
-  return [[(GPBBoolObjectDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithCapacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithCapacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithObjects:NULL forKeys:NULL count:0];
 }
@@ -13189,54 +11730,6 @@ void GPBDictionaryReadEntry(id mapDictionary,
 
 @synthesize validationFunc = _validationFunc;
 
-+ (instancetype)dictionary {
-  return [[[self alloc] initWithValidationFunction:NULL
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func {
-  return [[[self alloc] initWithValidationFunction:func
-                                         rawValues:NULL
-                                           forKeys:NULL
-                                             count:0] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValue:(int32_t)rawValue
-                                          forKey:(BOOL)key {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolEnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                 rawValues:&rawValue
-                                                                   forKeys:&key
-                                                                     count:1] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                       rawValues:(const int32_t [])values
-                                         forKeys:(const BOOL [])keys
-                                           count:(NSUInteger)count {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolEnumDictionary*)[self alloc] initWithValidationFunction:func
-                                                                 rawValues:values
-                                                                   forKeys:keys
-                                                                     count:count] autorelease];
-}
-
-+ (instancetype)dictionaryWithDictionary:(GPBBoolEnumDictionary *)dictionary {
-  // Cast is needed so the compiler knows what class we are invoking initWithValues:forKeys:count:
-  // on to get the type correct.
-  return [[(GPBBoolEnumDictionary*)[self alloc] initWithDictionary:dictionary] autorelease];
-}
-
-+ (instancetype)dictionaryWithValidationFunction:(GPBEnumValidationFunc)func
-                                        capacity:(NSUInteger)numItems {
-  return [[[self alloc] initWithValidationFunction:func capacity:numItems] autorelease];
-}
-
 - (instancetype)init {
   return [self initWithValidationFunction:NULL rawValues:NULL forKeys:NULL count:0];
 }
@@ -13609,14 +12102,14 @@ void GPBDictionaryReadEntry(id mapDictionary,
   }
 }
 
-- (void)enumerateKeysAndObjectsUsingBlock:(void (^)(id key,
+- (void)enumerateKeysAndObjectsUsingBlock:(void (NS_NOESCAPE ^)(id key,
                                                     id obj,
                                                     BOOL *stop))block {
   [_dictionary enumerateKeysAndObjectsUsingBlock:block];
 }
 
 - (void)enumerateKeysAndObjectsWithOptions:(NSEnumerationOptions)opts
-                                usingBlock:(void (^)(id key,
+                                usingBlock:(void (NS_NOESCAPE ^)(id key,
                                                      id obj,
                                                      BOOL *stop))block {
   [_dictionary enumerateKeysAndObjectsWithOptions:opts usingBlock:block];
diff --git a/objectivec/GPBExtensionRegistry.m b/objectivec/GPBExtensionRegistry.m
index 65534b67..b056a52d 100644
--- a/objectivec/GPBExtensionRegistry.m
+++ b/objectivec/GPBExtensionRegistry.m
@@ -57,14 +57,16 @@
 
 - (instancetype)copyWithZone:(NSZone *)zone {
   GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
-  if (result && mutableClassMap_.count) {
-    [result->mutableClassMap_ addEntriesFromDictionary:mutableClassMap_];
-  }
+  [result addExtensions:self];
   return result;
 }
 
-- (CFMutableDictionaryRef)extensionMapForContainingMessageClass:
-        (Class)containingMessageClass {
+- (void)addExtension:(GPBExtensionDescriptor *)extension {
+  if (extension == nil) {
+    return;
+  }
+
+  Class containingMessageClass = extension.containingMessageClass;
   CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
       [mutableClassMap_ objectForKey:containingMessageClass];
   if (extensionMap == nil) {
@@ -74,18 +76,9 @@
                                              &kCFTypeDictionaryValueCallBacks);
     [mutableClassMap_ setObject:(id)extensionMap
                          forKey:(id<NSCopying>)containingMessageClass];
+    CFRelease(extensionMap);
   }
-  return extensionMap;
-}
 
-- (void)addExtension:(GPBExtensionDescriptor *)extension {
-  if (extension == nil) {
-    return;
-  }
-
-  Class containingMessageClass = extension.containingMessageClass;
-  CFMutableDictionaryRef extensionMap =
-      [self extensionMapForContainingMessageClass:containingMessageClass];
   ssize_t key = extension.fieldNumber;
   CFDictionarySetValue(extensionMap, (const void *)key, extension);
 }
@@ -119,10 +112,16 @@ static void CopyKeyValue(const void *key, const void *value, void *context) {
     Class containingMessageClass = key;
     CFMutableDictionaryRef otherExtensionMap = (CFMutableDictionaryRef)value;
 
-    CFMutableDictionaryRef extensionMap =
-        [self extensionMapForContainingMessageClass:containingMessageClass];
-
-    CFDictionaryApplyFunction(otherExtensionMap, CopyKeyValue, extensionMap);
+    CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
+        [mutableClassMap_ objectForKey:containingMessageClass];
+    if (extensionMap == nil) {
+      extensionMap = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, otherExtensionMap);
+      [mutableClassMap_ setObject:(id)extensionMap
+                           forKey:(id<NSCopying>)containingMessageClass];
+      CFRelease(extensionMap);
+    } else {
+      CFDictionaryApplyFunction(otherExtensionMap, CopyKeyValue, extensionMap);
+    }
   }];
 }
 
diff --git a/objectivec/GPBMessage.h b/objectivec/GPBMessage.h
index c07ec888..276740d2 100644
--- a/objectivec/GPBMessage.h
+++ b/objectivec/GPBMessage.h
@@ -66,6 +66,11 @@ CF_EXTERN_C_END
 /**
  * Base class that each generated message subclasses from.
  *
+ * @note @c NSCopying support is a "deep copy", in that all sub objects are
+ *       copied.  Just like you wouldn't want a UIView/NSView trying to
+ *       exist in two places, you don't want a sub message to be a property
+ *       property of two other messages.
+ *
  * @note While the class support NSSecureCoding, if the message has any
  *       extensions, they will end up reloaded in @c unknownFields as there is
  *       no way for the @c NSCoding plumbing to pass through a
@@ -287,6 +292,9 @@ CF_EXTERN_C_END
  * Writes out the message to the given coded output stream.
  *
  * @param output The coded output stream into which to write the message.
+ *
+ * @note This can raise the GPBCodedOutputStreamException_* exceptions.
+ *
  **/
 - (void)writeToCodedOutputStream:(GPBCodedOutputStream *)output;
 
@@ -294,6 +302,8 @@ CF_EXTERN_C_END
  * Writes out the message to the given output stream.
  *
  * @param output The output stream into which to write the message.
+ *
+ * @note This can raise the GPBCodedOutputStreamException_* exceptions.
  **/
 - (void)writeToOutputStream:(NSOutputStream *)output;
 
@@ -302,6 +312,8 @@ CF_EXTERN_C_END
  * the given output stream.
  *
  * @param output The coded output stream into which to write the message.
+ *
+ * @note This can raise the GPBCodedOutputStreamException_* exceptions.
  **/
 - (void)writeDelimitedToCodedOutputStream:(GPBCodedOutputStream *)output;
 
@@ -310,6 +322,8 @@ CF_EXTERN_C_END
  * the given output stream.
  *
  * @param output The output stream into which to write the message.
+ *
+ * @note This can raise the GPBCodedOutputStreamException_* exceptions.
  **/
 - (void)writeDelimitedToOutputStream:(NSOutputStream *)output;
 
diff --git a/objectivec/GPBMessage.m b/objectivec/GPBMessage.m
index 58a10fdb..db5d3b60 100644
--- a/objectivec/GPBMessage.m
+++ b/objectivec/GPBMessage.m
@@ -32,6 +32,7 @@
 
 #import <objc/runtime.h>
 #import <objc/message.h>
+#import <stdatomic.h>
 
 #import "GPBArray_PackagePrivate.h"
 #import "GPBCodedInputStream_PackagePrivate.h"
@@ -77,6 +78,20 @@ static NSString *const kGPBDataCoderKey = @"GPBData";
   GPBMessage *autocreator_;
   GPBFieldDescriptor *autocreatorField_;
   GPBExtensionDescriptor *autocreatorExtension_;
+
+  // A lock to provide mutual exclusion from internal data that can be modified
+  // by *read* operations such as getters (autocreation of message fields and
+  // message extensions, not setting of values). Used to guarantee thread safety
+  // for concurrent reads on the message.
+  // NOTE: OSSpinLock may seem like a good fit here but Apple engineers have
+  // pointed out that they are vulnerable to live locking on iOS in cases of
+  // priority inversion:
+  //   http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
+  //   https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
+  // Use of readOnlySemaphore_ must be prefaced by a call to
+  // GPBPrepareReadOnlySemaphore to ensure it has been created. This allows
+  // readOnlySemaphore_ to be only created when actually needed.
+  _Atomic(dispatch_semaphore_t) readOnlySemaphore_;
 }
 @end
 
@@ -130,7 +145,7 @@ static NSError *ErrorFromException(NSException *exception) {
 
 static void CheckExtension(GPBMessage *self,
                            GPBExtensionDescriptor *extension) {
-  if ([self class] != extension.containingMessageClass) {
+  if (![self isKindOfClass:extension.containingMessageClass]) {
     [NSException
          raise:NSInvalidArgumentException
         format:@"Extension %@ used on wrong class (%@ instead of %@)",
@@ -738,6 +753,31 @@ void GPBClearMessageAutocreator(GPBMessage *self) {
   self->autocreatorExtension_ = nil;
 }
 
+// Call this before using the readOnlySemaphore_. This ensures it is created only once.
+void GPBPrepareReadOnlySemaphore(GPBMessage *self) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdirect-ivar-access"
+
+  // Create the semaphore on demand (rather than init) as developers might not cause them
+  // to be needed, and the heap usage can add up.  The atomic swap is used to avoid needing
+  // another lock around creating it.
+  if (self->readOnlySemaphore_ == nil) {
+    dispatch_semaphore_t worker = dispatch_semaphore_create(1);
+    dispatch_semaphore_t expected = nil;
+    if (!atomic_compare_exchange_strong(&self->readOnlySemaphore_, &expected, worker)) {
+      dispatch_release(worker);
+    }
+#if defined(__clang_analyzer__)
+    // The Xcode 9.2 (and 9.3 beta) static analyzer thinks worker is leaked
+    // (doesn't seem to know about atomic_compare_exchange_strong); so just
+    // for the analyzer, let it think worker is also released in this case.
+    else { dispatch_release(worker); }
+#endif
+  }
+
+#pragma clang diagnostic pop
+}
+
 static GPBUnknownFieldSet *GetOrMakeUnknownFields(GPBMessage *self) {
   if (!self->unknownFields_) {
     self->unknownFields_ = [[GPBUnknownFieldSet alloc] init];
@@ -950,7 +990,8 @@ static GPBUnknownFieldSet *GetOrMakeUnknownFields(GPBMessage *self) {
               newValue = [value copyWithZone:zone];
             }
           } else {
-            if (field.mapKeyDataType == GPBDataTypeString) {
+            if ((field.mapKeyDataType == GPBDataTypeString) &&
+                GPBFieldDataTypeIsObject(field)) {
               // NSDictionary
               newValue = [value mutableCopyWithZone:zone];
             } else {
@@ -2007,7 +2048,12 @@ static GPBUnknownFieldSet *GetOrMakeUnknownFields(GPBMessage *self) {
       [newInput release];
     } else {
       GPBUnknownFieldSet *unknownFields = GetOrMakeUnknownFields(self);
-      [unknownFields mergeMessageSetMessage:typeId data:rawBytes];
+      // rawBytes was created via a NoCopy, so it can be reusing a
+      // subrange of another NSData that might go out of scope as things
+      // unwind, so a copy is needed to ensure what is saved in the
+      // unknown fields stays valid.
+      NSData *cloned = [NSData dataWithData:rawBytes];
+      [unknownFields mergeMessageSetMessage:typeId data:cloned];
     }
   }
 }
@@ -2353,17 +2399,11 @@ static void MergeRepeatedNotPackedFieldFromCodedInputStream(
         // zero signals EOF / limit reached
         return;
       } else {
-        if (GPBPreserveUnknownFields(syntax)) {
-          if (![self parseUnknownField:input
-                     extensionRegistry:extensionRegistry
-                                   tag:tag]) {
-            // it's an endgroup tag
-            return;
-          }
-        } else {
-          if (![input skipField:tag]) {
-            return;
-          }
+        if (![self parseUnknownField:input
+                   extensionRegistry:extensionRegistry
+                                 tag:tag]) {
+          // it's an endgroup tag
+          return;
         }
       }
     }  // if(!merged)
@@ -2578,13 +2618,14 @@ static void MergeRepeatedNotPackedFieldFromCodedInputStream(
   if (other == self) {
     return YES;
   }
-  if (![other isKindOfClass:[self class]] &&
-      ![self isKindOfClass:[other class]]) {
+  if (![other isKindOfClass:[GPBMessage class]]) {
     return NO;
   }
-
   GPBMessage *otherMsg = other;
   GPBDescriptor *descriptor = [[self class] descriptor];
+  if ([[otherMsg class] descriptor] != descriptor) {
+    return NO;
+  }
   uint8_t *selfStorage = (uint8_t *)messageStorage_;
   uint8_t *otherStorage = (uint8_t *)otherMsg->messageStorage_;
 
@@ -2984,7 +3025,10 @@ typedef struct ResolveIvarAccessorMethodResult {
   SEL encodingSelector;
 } ResolveIvarAccessorMethodResult;
 
-static void ResolveIvarGet(GPBFieldDescriptor *field,
+// |field| can be __unsafe_unretained because they are created at startup
+// and are essentially global. No need to pay for retain/release when
+// they are captured in blocks.
+static void ResolveIvarGet(__unsafe_unretained GPBFieldDescriptor *field,
                            ResolveIvarAccessorMethodResult *result) {
   GPBDataType fieldDataType = GPBGetFieldDataType(field);
   switch (fieldDataType) {
@@ -3026,7 +3070,8 @@ static void ResolveIvarGet(GPBFieldDescriptor *field,
   }
 }
 
-static void ResolveIvarSet(GPBFieldDescriptor *field,
+// See comment about __unsafe_unretained on ResolveIvarGet.
+static void ResolveIvarSet(__unsafe_unretained GPBFieldDescriptor *field,
                            GPBFileSyntax syntax,
                            ResolveIvarAccessorMethodResult *result) {
   GPBDataType fieldDataType = GPBGetFieldDataType(field);
@@ -3064,15 +3109,16 @@ static void ResolveIvarSet(GPBFieldDescriptor *field,
 + (BOOL)resolveInstanceMethod:(SEL)sel {
   const GPBDescriptor *descriptor = [self descriptor];
   if (!descriptor) {
-    return NO;
+    return [super resolveInstanceMethod:sel];
   }
 
   // NOTE: hasOrCountSel_/setHasSel_ will be NULL if the field for the given
   // message should not have has support (done in GPBDescriptor.m), so there is
   // no need for checks here to see if has*/setHas* are allowed.
-
   ResolveIvarAccessorMethodResult result = {NULL, NULL};
-  for (GPBFieldDescriptor *field in descriptor->fields_) {
+
+  // See comment about __unsafe_unretained on ResolveIvarGet.
+  for (__unsafe_unretained GPBFieldDescriptor *field in descriptor->fields_) {
     BOOL isMapOrArray = GPBFieldIsMapOrArray(field);
     if (!isMapOrArray) {
       // Single fields.
@@ -3170,7 +3216,7 @@ static void ResolveIvarSet(GPBFieldDescriptor *field,
 
 + (BOOL)resolveClassMethod:(SEL)sel {
   // Extensions scoped to a Message and looked up via class methods.
-  if (GPBResolveExtensionClassMethod(self, sel)) {
+  if (GPBResolveExtensionClassMethod([self descriptor].messageClass, sel)) {
     return YES;
   }
   return [super resolveClassMethod:sel];
@@ -3240,4 +3286,32 @@ id GPBGetMessageMapField(GPBMessage *self, GPBFieldDescriptor *field) {
   return GetOrCreateMapIvarWithField(self, field, syntax);
 }
 
+id GPBGetObjectIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
+  NSCAssert(!GPBFieldIsMapOrArray(field), @"Shouldn't get here");
+  if (GPBGetHasIvarField(self, field)) {
+    uint8_t *storage = (uint8_t *)self->messageStorage_;
+    id *typePtr = (id *)&storage[field->description_->offset];
+    return *typePtr;
+  }
+  // Not set...
+
+  // Non messages (string/data), get their default.
+  if (!GPBFieldDataTypeIsMessage(field)) {
+    return field.defaultValue.valueMessage;
+  }
+
+  GPBPrepareReadOnlySemaphore(self);
+  dispatch_semaphore_wait(self->readOnlySemaphore_, DISPATCH_TIME_FOREVER);
+  GPBMessage *result = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
+  if (!result) {
+    // For non repeated messages, create the object, set it and return it.
+    // This object will not initially be visible via GPBGetHasIvar, so
+    // we save its creator so it can become visible if it's mutated later.
+    result = GPBCreateMessageWithAutocreator(field.msgClass, self, field);
+    GPBSetAutocreatedRetainedObjectIvarWithField(self, field, result);
+  }
+  dispatch_semaphore_signal(self->readOnlySemaphore_);
+  return result;
+}
+
 #pragma clang diagnostic pop
diff --git a/objectivec/GPBMessage_PackagePrivate.h b/objectivec/GPBMessage_PackagePrivate.h
index 9324cf8d..ca10983b 100644
--- a/objectivec/GPBMessage_PackagePrivate.h
+++ b/objectivec/GPBMessage_PackagePrivate.h
@@ -34,6 +34,10 @@
 
 #import "GPBMessage.h"
 
+// TODO: Remove this import. Older generated code use the OSAtomic* apis,
+// so anyone that hasn't regenerated says building by having this. After
+// enough time has passed, this likely can be removed as folks should have
+// regenerated.
 #import <libkern/OSAtomic.h>
 
 #import "GPBBootstrap.h"
@@ -57,21 +61,6 @@ typedef struct GPBMessage_Storage *GPBMessage_StoragePtr;
   // GPBMessage_Storage with _has_storage__ as the first field.
   // Kept public because static functions need to access it.
   GPBMessage_StoragePtr messageStorage_;
-
-  // A lock to provide mutual exclusion from internal data that can be modified
-  // by *read* operations such as getters (autocreation of message fields and
-  // message extensions, not setting of values). Used to guarantee thread safety
-  // for concurrent reads on the message.
-  // NOTE: OSSpinLock may seem like a good fit here but Apple engineers have
-  // pointed out that they are vulnerable to live locking on iOS in cases of
-  // priority inversion:
-  //   http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
-  //   https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
-  // Use of readOnlySemaphore_ must be prefaced by a call to
-  // GPBPrepareReadOnlySemaphore to ensure it has been created. This allows
-  // readOnlySemaphore_ to be only created when actually needed.
-  dispatch_once_t readOnlySemaphoreCreationOnce_;
-  dispatch_semaphore_t readOnlySemaphore_;
 }
 
 // Gets an extension value without autocreating the result if not found. (i.e.
@@ -105,22 +94,7 @@ CF_EXTERN_C_BEGIN
 
 
 // Call this before using the readOnlySemaphore_. This ensures it is created only once.
-NS_INLINE void GPBPrepareReadOnlySemaphore(GPBMessage *self) {
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdirect-ivar-access"
-
-// Starting on Xcode 8.3, the static analyzer complains that the dispatch_once_t
-// variable passed to dispatch_once should not be allocated on the heap or
-// stack. Given that the semaphore is also an instance variable of the message,
-// both variables are cleared at the same time, so this is safe.
-#if !defined(__clang_analyzer__)
-  dispatch_once(&self->readOnlySemaphoreCreationOnce_, ^{
-    self->readOnlySemaphore_ = dispatch_semaphore_create(1);
-  });
-#endif  // !defined(__clang_analyzer__)
-
-#pragma clang diagnostic pop
-}
+void GPBPrepareReadOnlySemaphore(GPBMessage *self);
 
 // Returns a new instance that was automatically created by |autocreator| for
 // its field |field|.
diff --git a/objectivec/GPBProtocolBuffers_RuntimeSupport.h b/objectivec/GPBProtocolBuffers_RuntimeSupport.h
index fea75b93..04dde620 100644
--- a/objectivec/GPBProtocolBuffers_RuntimeSupport.h
+++ b/objectivec/GPBProtocolBuffers_RuntimeSupport.h
@@ -31,7 +31,7 @@
 // This header is meant to only be used by the generated source, it should not
 // be included in code using protocol buffers.
 
-#import "GPBProtocolBuffers.h"
+#import "GPBBootstrap.h"
 
 #import "GPBDescriptor_PackagePrivate.h"
 #import "GPBExtensionInternals.h"
diff --git a/objectivec/GPBRootObject.m b/objectivec/GPBRootObject.m
index 585d205a..bad2f9a7 100644
--- a/objectivec/GPBRootObject.m
+++ b/objectivec/GPBRootObject.m
@@ -43,6 +43,14 @@
 - (const char *)singletonNameC;
 @end
 
+// We need some object to conform to the MessageSignatureProtocol to make sure
+// the selectors in it are recorded in our Objective C runtime information.
+// GPBMessage is arguably the more "obvious" choice, but given that all messages
+// inherit from GPBMessage, conflicts seem likely, so we are using GPBRootObject
+// instead.
+@interface GPBRootObject () <GPBMessageSignatureProtocol>
+@end
+
 @implementation GPBRootObject
 
 // Taken from http://www.burtleburtle.net/bob/hash/doobs.html
diff --git a/objectivec/GPBUnknownField.h b/objectivec/GPBUnknownField.h
index a135cc20..5b96023b 100644
--- a/objectivec/GPBUnknownField.h
+++ b/objectivec/GPBUnknownField.h
@@ -42,6 +42,9 @@ NS_ASSUME_NONNULL_BEGIN
  **/
 @interface GPBUnknownField : NSObject<NSCopying>
 
+/** Initialize a field with the given number. */
+- (instancetype)initWithNumber:(int32_t)number;
+
 /** The field number the data is stored under. */
 @property(nonatomic, readonly, assign) int32_t number;
 
diff --git a/objectivec/GPBUnknownField.m b/objectivec/GPBUnknownField.m
index 30efe756..9d5c97f3 100644
--- a/objectivec/GPBUnknownField.m
+++ b/objectivec/GPBUnknownField.m
@@ -79,7 +79,7 @@
   result->mutableFixed32List_ = [mutableFixed32List_ copyWithZone:zone];
   result->mutableFixed64List_ = [mutableFixed64List_ copyWithZone:zone];
   result->mutableLengthDelimitedList_ =
-      [mutableLengthDelimitedList_ copyWithZone:zone];
+      [mutableLengthDelimitedList_ mutableCopyWithZone:zone];
   result->mutableVarintList_ = [mutableVarintList_ copyWithZone:zone];
   if (mutableGroupList_.count) {
     result->mutableGroupList_ = [[NSMutableArray allocWithZone:zone]
@@ -97,6 +97,7 @@
   if (self == object) return YES;
   if (![object isKindOfClass:[GPBUnknownField class]]) return NO;
   GPBUnknownField *field = (GPBUnknownField *)object;
+  if (number_ != field->number_) return NO;
   BOOL equalVarint =
       (mutableVarintList_.count == 0 && field->mutableVarintList_.count == 0) ||
       [mutableVarintList_ isEqual:field->mutableVarintList_];
@@ -202,8 +203,9 @@
 }
 
 - (NSString *)description {
-  NSMutableString *description = [NSMutableString
-      stringWithFormat:@"<%@ %p>: Field: %d {\n", [self class], self, number_];
+  NSMutableString *description =
+      [NSMutableString stringWithFormat:@"<%@ %p>: Field: %d {\n",
+       [self class], self, number_];
   [mutableVarintList_
       enumerateValuesWithBlock:^(uint64_t value, NSUInteger idx, BOOL *stop) {
 #pragma unused(idx, stop)
diff --git a/objectivec/GPBUnknownField_PackagePrivate.h b/objectivec/GPBUnknownField_PackagePrivate.h
index 1fbce0f9..2b4c7895 100644
--- a/objectivec/GPBUnknownField_PackagePrivate.h
+++ b/objectivec/GPBUnknownField_PackagePrivate.h
@@ -36,8 +36,6 @@
 
 @interface GPBUnknownField ()
 
-- (instancetype)initWithNumber:(int32_t)number;
-
 - (void)writeToOutput:(GPBCodedOutputStream *)output;
 - (size_t)serializedSize;
 
diff --git a/objectivec/GPBUtilities.m b/objectivec/GPBUtilities.m
index 5029ec73..e2a12ca4 100644
--- a/objectivec/GPBUtilities.m
+++ b/objectivec/GPBUtilities.m
@@ -49,6 +49,19 @@ static void AppendTextFormatForMessage(GPBMessage *message,
                                        NSMutableString *toStr,
                                        NSString *lineIndent);
 
+// Are two datatypes the same basic type representation (ex Int32 and SInt32).
+// Marked unused because currently only called from asserts/debug.
+static BOOL DataTypesEquivalent(GPBDataType type1,
+                                GPBDataType type2) __attribute__ ((unused));
+
+// Basic type representation for a type (ex: for SInt32 it is Int32).
+// Marked unused because currently only called from asserts/debug.
+static GPBDataType BaseDataType(GPBDataType type) __attribute__ ((unused));
+
+// String name for a data type.
+// Marked unused because currently only called from asserts/debug.
+static NSString *TypeToString(GPBDataType dataType) __attribute__ ((unused));
+
 NSData *GPBEmptyNSData(void) {
   static dispatch_once_t onceToken;
   static NSData *defaultNSData = nil;
@@ -278,7 +291,7 @@ BOOL GPBGetHasIvar(GPBMessage *self, int32_t idx, uint32_t fieldNumber) {
   } else {
     NSCAssert(idx != GPBNoHasBit, @"Invalid has bit.");
     uint32_t byteIndex = idx / 32;
-    uint32_t bitMask = (1 << (idx % 32));
+    uint32_t bitMask = (1U << (idx % 32));
     BOOL hasIvar =
         (self->messageStorage_->_has_storage_[byteIndex] & bitMask) ? YES : NO;
     return hasIvar;
@@ -302,7 +315,7 @@ void GPBSetHasIvar(GPBMessage *self, int32_t idx, uint32_t fieldNumber,
     NSCAssert(idx != GPBNoHasBit, @"Invalid has bit.");
     uint32_t *has_storage = self->messageStorage_->_has_storage_;
     uint32_t byte = idx / 32;
-    uint32_t bitMask = (1 << (idx % 32));
+    uint32_t bitMask = (1U << (idx % 32));
     if (value) {
       has_storage[byte] |= bitMask;
     } else {
@@ -342,6 +355,14 @@ void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
 //%PDDM-DEFINE IVAR_POD_ACCESSORS_DEFN(NAME, TYPE)
 //%TYPE GPBGetMessage##NAME##Field(GPBMessage *self,
 //% TYPE$S            NAME$S       GPBFieldDescriptor *field) {
+//%#if defined(DEBUG) && DEBUG
+//%  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+//%                                GPBDataType##NAME),
+//%            @"Attempting to get value of TYPE from field %@ "
+//%            @"of %@ which is of type %@.",
+//%            [self class], field.name,
+//%            TypeToString(GPBGetFieldDataType(field)));
+//%#endif
 //%  if (GPBGetHasIvarField(self, field)) {
 //%    uint8_t *storage = (uint8_t *)self->messageStorage_;
 //%    TYPE *typePtr = (TYPE *)&storage[field->description_->offset];
@@ -364,14 +385,24 @@ void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
 //%            NAME$S                     GPBFieldDescriptor *field,
 //%            NAME$S                     TYPE value,
 //%            NAME$S                     GPBFileSyntax syntax) {
+//%#if defined(DEBUG) && DEBUG
+//%  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+//%                                GPBDataType##NAME),
+//%            @"Attempting to set field %@ of %@ which is of type %@ with "
+//%            @"value of type TYPE.",
+//%            [self class], field.name,
+//%            TypeToString(GPBGetFieldDataType(field)));
+//%#endif
 //%  GPBOneofDescriptor *oneof = field->containingOneof_;
 //%  if (oneof) {
 //%    GPBMessageFieldDescription *fieldDesc = field->description_;
 //%    GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
 //%  }
+//%#if defined(DEBUG) && DEBUG
 //%  NSCAssert(self->messageStorage_ != NULL,
 //%            @"%@: All messages should have storage (from init)",
 //%            [self class]);
+//%#endif
 //%#if defined(__clang_analyzer__)
 //%  if (self->messageStorage_ == NULL) return;
 //%#endif
@@ -391,6 +422,14 @@ void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
 //%// Only exists for public api, no core code should use this.
 //%TYPE *GPBGetMessage##NAME##Field(GPBMessage *self,
 //% TYPE$S             NAME$S       GPBFieldDescriptor *field) {
+//%#if defined(DEBUG) && DEBUG
+//%  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+//%                                GPBDataType##NAME),
+//%            @"Attempting to get value of TYPE from field %@ "
+//%            @"of %@ which is of type %@.",
+//%            [self class], field.name,
+//%            TypeToString(GPBGetFieldDataType(field)));
+//%#endif
 //%  return (TYPE *)GPBGetObjectIvarWithField(self, field);
 //%}
 //%
@@ -398,6 +437,14 @@ void GPBMaybeClearOneof(GPBMessage *self, GPBOneofDescriptor *oneof,
 //%void GPBSetMessage##NAME##Field(GPBMessage *self,
 //%                   NAME$S     GPBFieldDescriptor *field,
 //%                   NAME$S     TYPE *value) {
+//%#if defined(DEBUG) && DEBUG
+//%  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+//%                                GPBDataType##NAME),
+//%            @"Attempting to set field %@ of %@ which is of type %@ with "
+//%            @"value of type TYPE.",
+//%            [self class], field.name,
+//%            TypeToString(GPBGetFieldDataType(field)));
+//%#endif
 //%  GPBSetObjectIvarWithField(self, field, (id)value);
 //%}
 //%
@@ -455,7 +502,7 @@ void GPBSetRetainedObjectIvarWithFieldInternal(GPBMessage *self,
   GPBDataType fieldType = GPBGetFieldDataType(field);
   BOOL isMapOrArray = GPBFieldIsMapOrArray(field);
   BOOL fieldIsMessage = GPBDataTypeIsMessage(fieldType);
-#ifdef DEBUG
+#if defined(DEBUG) && DEBUG
   if (value == nil && !isMapOrArray && !fieldIsMessage &&
       field.hasDefaultValue) {
     // Setting a message to nil is an obvious way to "clear" the value
@@ -581,34 +628,6 @@ id GPBGetObjectIvarWithFieldNoAutocreate(GPBMessage *self,
   return *typePtr;
 }
 
-id GPBGetObjectIvarWithField(GPBMessage *self, GPBFieldDescriptor *field) {
-  NSCAssert(!GPBFieldIsMapOrArray(field), @"Shouldn't get here");
-  if (GPBGetHasIvarField(self, field)) {
-    uint8_t *storage = (uint8_t *)self->messageStorage_;
-    id *typePtr = (id *)&storage[field->description_->offset];
-    return *typePtr;
-  }
-  // Not set...
-
-  // Non messages (string/data), get their default.
-  if (!GPBFieldDataTypeIsMessage(field)) {
-    return field.defaultValue.valueMessage;
-  }
-
-  GPBPrepareReadOnlySemaphore(self);
-  dispatch_semaphore_wait(self->readOnlySemaphore_, DISPATCH_TIME_FOREVER);
-  GPBMessage *result = GPBGetObjectIvarWithFieldNoAutocreate(self, field);
-  if (!result) {
-    // For non repeated messages, create the object, set it and return it.
-    // This object will not initially be visible via GPBGetHasIvar, so
-    // we save its creator so it can become visible if it's mutated later.
-    result = GPBCreateMessageWithAutocreator(field.msgClass, self, field);
-    GPBSetAutocreatedRetainedObjectIvarWithField(self, field, result);
-  }
-  dispatch_semaphore_signal(self->readOnlySemaphore_);
-  return result;
-}
-
 // Only exists for public api, no core code should use this.
 int32_t GPBGetMessageEnumField(GPBMessage *self, GPBFieldDescriptor *field) {
   GPBFileSyntax syntax = [self descriptor].file.syntax;
@@ -618,6 +637,13 @@ int32_t GPBGetMessageEnumField(GPBMessage *self, GPBFieldDescriptor *field) {
 int32_t GPBGetEnumIvarWithFieldInternal(GPBMessage *self,
                                         GPBFieldDescriptor *field,
                                         GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(GPBGetFieldDataType(field) == GPBDataTypeEnum,
+            @"Attempting to get value of type Enum from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   int32_t result = GPBGetMessageInt32Field(self, field);
   // If this is presevering unknown enums, make sure the value is valid before
   // returning it.
@@ -638,6 +664,13 @@ void GPBSetMessageEnumField(GPBMessage *self, GPBFieldDescriptor *field,
 void GPBSetEnumIvarWithFieldInternal(GPBMessage *self,
                                      GPBFieldDescriptor *field, int32_t value,
                                      GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(GPBGetFieldDataType(field) == GPBDataTypeEnum,
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type Enum.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   // Don't allow in unknown values.  Proto3 can use the Raw method.
   if (![field isValidEnumValue:value]) {
     [NSException raise:NSInvalidArgumentException
@@ -663,6 +696,13 @@ void GPBSetMessageRawEnumField(GPBMessage *self, GPBFieldDescriptor *field,
 
 BOOL GPBGetMessageBoolField(GPBMessage *self,
                             GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field), GPBDataTypeBool),
+            @"Attempting to get value of type bool from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     // Bools are stored in the has bits to avoid needing explicit space in the
     // storage structure.
@@ -688,6 +728,13 @@ void GPBSetBoolIvarWithFieldInternal(GPBMessage *self,
                                      GPBFieldDescriptor *field,
                                      BOOL value,
                                      GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field), GPBDataTypeBool),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type bool.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBMessageFieldDescription *fieldDesc = field->description_;
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
@@ -714,6 +761,14 @@ void GPBSetBoolIvarWithFieldInternal(GPBMessage *self,
 
 int32_t GPBGetMessageInt32Field(GPBMessage *self,
                                 GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeInt32),
+            @"Attempting to get value of int32_t from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     int32_t *typePtr = (int32_t *)&storage[field->description_->offset];
@@ -736,14 +791,24 @@ void GPBSetInt32IvarWithFieldInternal(GPBMessage *self,
                                       GPBFieldDescriptor *field,
                                       int32_t value,
                                       GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeInt32),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type int32_t.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -764,6 +829,14 @@ void GPBSetInt32IvarWithFieldInternal(GPBMessage *self,
 
 uint32_t GPBGetMessageUInt32Field(GPBMessage *self,
                                   GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeUInt32),
+            @"Attempting to get value of uint32_t from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     uint32_t *typePtr = (uint32_t *)&storage[field->description_->offset];
@@ -786,14 +859,24 @@ void GPBSetUInt32IvarWithFieldInternal(GPBMessage *self,
                                        GPBFieldDescriptor *field,
                                        uint32_t value,
                                        GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeUInt32),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type uint32_t.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -814,6 +897,14 @@ void GPBSetUInt32IvarWithFieldInternal(GPBMessage *self,
 
 int64_t GPBGetMessageInt64Field(GPBMessage *self,
                                 GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeInt64),
+            @"Attempting to get value of int64_t from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     int64_t *typePtr = (int64_t *)&storage[field->description_->offset];
@@ -836,14 +927,24 @@ void GPBSetInt64IvarWithFieldInternal(GPBMessage *self,
                                       GPBFieldDescriptor *field,
                                       int64_t value,
                                       GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeInt64),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type int64_t.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -864,6 +965,14 @@ void GPBSetInt64IvarWithFieldInternal(GPBMessage *self,
 
 uint64_t GPBGetMessageUInt64Field(GPBMessage *self,
                                   GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeUInt64),
+            @"Attempting to get value of uint64_t from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     uint64_t *typePtr = (uint64_t *)&storage[field->description_->offset];
@@ -886,14 +995,24 @@ void GPBSetUInt64IvarWithFieldInternal(GPBMessage *self,
                                        GPBFieldDescriptor *field,
                                        uint64_t value,
                                        GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeUInt64),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type uint64_t.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -914,6 +1033,14 @@ void GPBSetUInt64IvarWithFieldInternal(GPBMessage *self,
 
 float GPBGetMessageFloatField(GPBMessage *self,
                               GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeFloat),
+            @"Attempting to get value of float from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     float *typePtr = (float *)&storage[field->description_->offset];
@@ -936,14 +1063,24 @@ void GPBSetFloatIvarWithFieldInternal(GPBMessage *self,
                                       GPBFieldDescriptor *field,
                                       float value,
                                       GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeFloat),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type float.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -964,6 +1101,14 @@ void GPBSetFloatIvarWithFieldInternal(GPBMessage *self,
 
 double GPBGetMessageDoubleField(GPBMessage *self,
                                 GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeDouble),
+            @"Attempting to get value of double from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   if (GPBGetHasIvarField(self, field)) {
     uint8_t *storage = (uint8_t *)self->messageStorage_;
     double *typePtr = (double *)&storage[field->description_->offset];
@@ -986,14 +1131,24 @@ void GPBSetDoubleIvarWithFieldInternal(GPBMessage *self,
                                        GPBFieldDescriptor *field,
                                        double value,
                                        GPBFileSyntax syntax) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeDouble),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type double.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBOneofDescriptor *oneof = field->containingOneof_;
   if (oneof) {
     GPBMessageFieldDescription *fieldDesc = field->description_;
     GPBMaybeClearOneof(self, oneof, fieldDesc->hasIndex, fieldDesc->number);
   }
+#if defined(DEBUG) && DEBUG
   NSCAssert(self->messageStorage_ != NULL,
             @"%@: All messages should have storage (from init)",
             [self class]);
+#endif
 #if defined(__clang_analyzer__)
   if (self->messageStorage_ == NULL) return;
 #endif
@@ -1019,6 +1174,14 @@ void GPBSetDoubleIvarWithFieldInternal(GPBMessage *self,
 // Only exists for public api, no core code should use this.
 NSString *GPBGetMessageStringField(GPBMessage *self,
                                    GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeString),
+            @"Attempting to get value of NSString from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   return (NSString *)GPBGetObjectIvarWithField(self, field);
 }
 
@@ -1026,6 +1189,14 @@ NSString *GPBGetMessageStringField(GPBMessage *self,
 void GPBSetMessageStringField(GPBMessage *self,
                               GPBFieldDescriptor *field,
                               NSString *value) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeString),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type NSString.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBSetObjectIvarWithField(self, field, (id)value);
 }
 
@@ -1035,6 +1206,14 @@ void GPBSetMessageStringField(GPBMessage *self,
 // Only exists for public api, no core code should use this.
 NSData *GPBGetMessageBytesField(GPBMessage *self,
                                 GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeBytes),
+            @"Attempting to get value of NSData from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   return (NSData *)GPBGetObjectIvarWithField(self, field);
 }
 
@@ -1042,6 +1221,14 @@ NSData *GPBGetMessageBytesField(GPBMessage *self,
 void GPBSetMessageBytesField(GPBMessage *self,
                              GPBFieldDescriptor *field,
                              NSData *value) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeBytes),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type NSData.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBSetObjectIvarWithField(self, field, (id)value);
 }
 
@@ -1051,6 +1238,14 @@ void GPBSetMessageBytesField(GPBMessage *self,
 // Only exists for public api, no core code should use this.
 GPBMessage *GPBGetMessageMessageField(GPBMessage *self,
                                       GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeMessage),
+            @"Attempting to get value of GPBMessage from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   return (GPBMessage *)GPBGetObjectIvarWithField(self, field);
 }
 
@@ -1058,6 +1253,14 @@ GPBMessage *GPBGetMessageMessageField(GPBMessage *self,
 void GPBSetMessageMessageField(GPBMessage *self,
                                GPBFieldDescriptor *field,
                                GPBMessage *value) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeMessage),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type GPBMessage.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBSetObjectIvarWithField(self, field, (id)value);
 }
 
@@ -1067,6 +1270,14 @@ void GPBSetMessageMessageField(GPBMessage *self,
 // Only exists for public api, no core code should use this.
 GPBMessage *GPBGetMessageGroupField(GPBMessage *self,
                                     GPBFieldDescriptor *field) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeGroup),
+            @"Attempting to get value of GPBMessage from field %@ "
+            @"of %@ which is of type %@.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   return (GPBMessage *)GPBGetObjectIvarWithField(self, field);
 }
 
@@ -1074,6 +1285,14 @@ GPBMessage *GPBGetMessageGroupField(GPBMessage *self,
 void GPBSetMessageGroupField(GPBMessage *self,
                              GPBFieldDescriptor *field,
                              GPBMessage *value) {
+#if defined(DEBUG) && DEBUG
+  NSCAssert(DataTypesEquivalent(GPBGetFieldDataType(field),
+                                GPBDataTypeGroup),
+            @"Attempting to set field %@ of %@ which is of type %@ with "
+            @"value of type GPBMessage.",
+            [self class], field.name,
+            TypeToString(GPBGetFieldDataType(field)));
+#endif
   GPBSetObjectIvarWithField(self, field, (id)value);
 }
 
@@ -1137,8 +1356,40 @@ void GPBSetMessageRepeatedField(GPBMessage *self, GPBFieldDescriptor *field, id
   GPBSetObjectIvarWithField(self, field, array);
 }
 
-#if defined(DEBUG) && DEBUG
-static NSString *TypeToStr(GPBDataType dataType) {
+static GPBDataType BaseDataType(GPBDataType type) {
+  switch (type) {
+    case GPBDataTypeSFixed32:
+    case GPBDataTypeInt32:
+    case GPBDataTypeSInt32:
+    case GPBDataTypeEnum:
+      return GPBDataTypeInt32;
+    case GPBDataTypeFixed32:
+    case GPBDataTypeUInt32:
+      return GPBDataTypeUInt32;
+    case GPBDataTypeSFixed64:
+    case GPBDataTypeInt64:
+    case GPBDataTypeSInt64:
+      return GPBDataTypeInt64;
+    case GPBDataTypeFixed64:
+    case GPBDataTypeUInt64:
+      return GPBDataTypeUInt64;
+    case GPBDataTypeMessage:
+    case GPBDataTypeGroup:
+      return GPBDataTypeMessage;
+    case GPBDataTypeBool:
+    case GPBDataTypeFloat:
+    case GPBDataTypeDouble:
+    case GPBDataTypeBytes:
+    case GPBDataTypeString:
+      return type;
+   }
+}
+
+static BOOL DataTypesEquivalent(GPBDataType type1, GPBDataType type2) {
+  return BaseDataType(type1) == BaseDataType(type2);
+}
+
+static NSString *TypeToString(GPBDataType dataType) {
   switch (dataType) {
     case GPBDataTypeBool:
       return @"Bool";
@@ -1166,10 +1417,9 @@ static NSString *TypeToStr(GPBDataType dataType) {
     case GPBDataTypeGroup:
       return @"Object";
     case GPBDataTypeEnum:
-      return @"Bool";
+      return @"Enum";
   }
 }
-#endif
 
 // GPBGetMessageMapField is defined in GPBMessage.m
 
@@ -1185,8 +1435,8 @@ void GPBSetMessageMapField(GPBMessage *self, GPBFieldDescriptor *field,
   if (dictionary) {
     GPBDataType keyDataType = field.mapKeyDataType;
     GPBDataType valueDataType = GPBGetFieldDataType(field);
-    NSString *keyStr = TypeToStr(keyDataType);
-    NSString *valueStr = TypeToStr(valueDataType);
+    NSString *keyStr = TypeToString(keyDataType);
+    NSString *valueStr = TypeToString(valueDataType);
     if (keyDataType == GPBDataTypeString) {
       keyStr = @"String";
     }
@@ -1216,8 +1466,11 @@ void GPBSetMessageMapField(GPBMessage *self, GPBFieldDescriptor *field,
 const char *GPBMessageEncodingForSelector(SEL selector, BOOL instanceSel) {
   Protocol *protocol =
       objc_getProtocol(GPBStringifySymbol(GPBMessageSignatureProtocol));
+  NSCAssert(protocol, @"Missing GPBMessageSignatureProtocol");
   struct objc_method_description description =
       protocol_getMethodDescription(protocol, selector, NO, instanceSel);
+  NSCAssert(description.name != Nil && description.types != nil,
+            @"Missing method for selector %@", NSStringFromSelector(selector));
   return description.types;
 }
 
@@ -1911,13 +2164,3 @@ BOOL GPBClassHasSel(Class aClass, SEL sel) {
   free(methodList);
   return result;
 }
-
-#pragma mark - GPBMessageSignatureProtocol
-
-// A series of selectors that are used solely to get @encoding values
-// for them by the dynamic protobuf runtime code. An object using the protocol
-// needs to be declared for the protocol to be valid at runtime.
-@interface GPBMessageSignatureProtocol : NSObject<GPBMessageSignatureProtocol>
-@end
-@implementation GPBMessageSignatureProtocol
-@end
diff --git a/objectivec/GPBUtilities_PackagePrivate.h b/objectivec/GPBUtilities_PackagePrivate.h
index 16859d48..ed424ce3 100644
--- a/objectivec/GPBUtilities_PackagePrivate.h
+++ b/objectivec/GPBUtilities_PackagePrivate.h
@@ -124,7 +124,7 @@ GPB_INLINE int64_t GPBDecodeZigZag64(uint64_t n) {
 // thus always taking 10 bytes on the wire.)
 GPB_INLINE uint32_t GPBEncodeZigZag32(int32_t n) {
   // Note:  the right-shift must be arithmetic
-  return (uint32_t)((n << 1) ^ (n >> 31));
+  return ((uint32_t)n << 1) ^ (uint32_t)(n >> 31);
 }
 
 // Encode a ZigZag-encoded 64-bit value.  ZigZag encodes signed integers
@@ -133,7 +133,7 @@ GPB_INLINE uint32_t GPBEncodeZigZag32(int32_t n) {
 // thus always taking 10 bytes on the wire.)
 GPB_INLINE uint64_t GPBEncodeZigZag64(int64_t n) {
   // Note:  the right-shift must be arithmetic
-  return (uint64_t)((n << 1) ^ (n >> 63));
+  return ((uint64_t)n << 1) ^ (uint64_t)(n >> 63);
 }
 
 #pragma clang diagnostic push
@@ -309,7 +309,8 @@ NSString *GPBDecodeTextFormatName(const uint8_t *decodeData, int32_t key,
 
 // A series of selectors that are used solely to get @encoding values
 // for them by the dynamic protobuf runtime code. See
-// GPBMessageEncodingForSelector for details.
+// GPBMessageEncodingForSelector for details. GPBRootObject conforms to
+// the protocol so that it is encoded in the Objective C runtime.
 @protocol GPBMessageSignatureProtocol
 @optional
 
diff --git a/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
index 919d0076..a41be9f2 100644
--- a/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
+++ b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.pbxproj
@@ -37,6 +37,31 @@
 		8BF8193514A0DDA600A2C982 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
 		F401DC2D1A8D444600FCC765 /* GPBArray.m in Sources */ = {isa = PBXBuildFile; fileRef = F401DC2B1A8D444600FCC765 /* GPBArray.m */; };
 		F401DC331A8E5C0200FCC765 /* GPBArrayTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F401DC321A8E5C0200FCC765 /* GPBArrayTests.m */; };
+		F40EE4AB206BF8B90071091A /* GPBCompileTest01.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE488206BF8B00071091A /* GPBCompileTest01.m */; };
+		F40EE4AC206BF8B90071091A /* GPBCompileTest02.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE481206BF8AE0071091A /* GPBCompileTest02.m */; };
+		F40EE4AD206BF8B90071091A /* GPBCompileTest03.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE491206BF8B10071091A /* GPBCompileTest03.m */; };
+		F40EE4AE206BF8B90071091A /* GPBCompileTest04.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE47E206BF8AE0071091A /* GPBCompileTest04.m */; };
+		F40EE4AF206BF8B90071091A /* GPBCompileTest05.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE47F206BF8AE0071091A /* GPBCompileTest05.m */; };
+		F40EE4B0206BF8B90071091A /* GPBCompileTest06.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE492206BF8B10071091A /* GPBCompileTest06.m */; };
+		F40EE4B1206BF8B90071091A /* GPBCompileTest07.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE480206BF8AE0071091A /* GPBCompileTest07.m */; };
+		F40EE4B2206BF8B90071091A /* GPBCompileTest08.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE47D206BF8AD0071091A /* GPBCompileTest08.m */; };
+		F40EE4B3206BF8B90071091A /* GPBCompileTest09.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE484206BF8AF0071091A /* GPBCompileTest09.m */; };
+		F40EE4B4206BF8B90071091A /* GPBCompileTest10.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE48C206BF8B00071091A /* GPBCompileTest10.m */; };
+		F40EE4B5206BF8B90071091A /* GPBCompileTest11.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE493206BF8B20071091A /* GPBCompileTest11.m */; };
+		F40EE4B6206BF8B90071091A /* GPBCompileTest12.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE490206BF8B10071091A /* GPBCompileTest12.m */; };
+		F40EE4B7206BF8B90071091A /* GPBCompileTest13.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE483206BF8AF0071091A /* GPBCompileTest13.m */; };
+		F40EE4B8206BF8B90071091A /* GPBCompileTest14.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE48F206BF8B10071091A /* GPBCompileTest14.m */; };
+		F40EE4B9206BF8B90071091A /* GPBCompileTest15.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE489206BF8B00071091A /* GPBCompileTest15.m */; };
+		F40EE4BA206BF8B90071091A /* GPBCompileTest16.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE48B206BF8B00071091A /* GPBCompileTest16.m */; };
+		F40EE4BB206BF8B90071091A /* GPBCompileTest17.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE48D206BF8B00071091A /* GPBCompileTest17.m */; };
+		F40EE4BC206BF8B90071091A /* GPBCompileTest18.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE48E206BF8B10071091A /* GPBCompileTest18.m */; };
+		F40EE4BD206BF8B90071091A /* GPBCompileTest19.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE482206BF8AF0071091A /* GPBCompileTest19.m */; };
+		F40EE4BE206BF8B90071091A /* GPBCompileTest20.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE485206BF8AF0071091A /* GPBCompileTest20.m */; };
+		F40EE4BF206BF8B90071091A /* GPBCompileTest21.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE486206BF8AF0071091A /* GPBCompileTest21.m */; };
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+		F40EE4C1206BF8B90071091A /* GPBCompileTest23.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE487206BF8B00071091A /* GPBCompileTest23.m */; };
+		F40EE50B206C06640071091A /* GPBCompileTest24.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE508206C06440071091A /* GPBCompileTest24.m */; };
+		F40EE50C206C06640071091A /* GPBCompileTest25.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE507206C06440071091A /* GPBCompileTest25.m */; };
 		F41C175D1833D3310064ED4D /* GPBPerfTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F41C175C1833D3310064ED4D /* GPBPerfTests.m */; };
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@@ -52,6 +77,7 @@
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+		F4584D821ECCB52A00803AB6 /* GPBExtensionRegistryTest.m in Sources */ = {isa = PBXBuildFile; fileRef = F4584D7E1ECCB38900803AB6 /* GPBExtensionRegistryTest.m */; };
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@@ -157,6 +183,31 @@
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+		F40EE47D206BF8AD0071091A /* GPBCompileTest08.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest08.m; sourceTree = "<group>"; };
+		F40EE47E206BF8AE0071091A /* GPBCompileTest04.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest04.m; sourceTree = "<group>"; };
+		F40EE47F206BF8AE0071091A /* GPBCompileTest05.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest05.m; sourceTree = "<group>"; };
+		F40EE480206BF8AE0071091A /* GPBCompileTest07.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest07.m; sourceTree = "<group>"; };
+		F40EE481206BF8AE0071091A /* GPBCompileTest02.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest02.m; sourceTree = "<group>"; };
+		F40EE482206BF8AF0071091A /* GPBCompileTest19.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest19.m; sourceTree = "<group>"; };
+		F40EE483206BF8AF0071091A /* GPBCompileTest13.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest13.m; sourceTree = "<group>"; };
+		F40EE484206BF8AF0071091A /* GPBCompileTest09.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest09.m; sourceTree = "<group>"; };
+		F40EE485206BF8AF0071091A /* GPBCompileTest20.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest20.m; sourceTree = "<group>"; };
+		F40EE486206BF8AF0071091A /* GPBCompileTest21.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest21.m; sourceTree = "<group>"; };
+		F40EE487206BF8B00071091A /* GPBCompileTest23.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest23.m; sourceTree = "<group>"; };
+		F40EE488206BF8B00071091A /* GPBCompileTest01.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest01.m; sourceTree = "<group>"; };
+		F40EE489206BF8B00071091A /* GPBCompileTest15.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest15.m; sourceTree = "<group>"; };
+		F40EE48A206BF8B00071091A /* GPBCompileTest22.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest22.m; sourceTree = "<group>"; };
+		F40EE48B206BF8B00071091A /* GPBCompileTest16.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest16.m; sourceTree = "<group>"; };
+		F40EE48C206BF8B00071091A /* GPBCompileTest10.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest10.m; sourceTree = "<group>"; };
+		F40EE48D206BF8B00071091A /* GPBCompileTest17.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest17.m; sourceTree = "<group>"; };
+		F40EE48E206BF8B10071091A /* GPBCompileTest18.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest18.m; sourceTree = "<group>"; };
+		F40EE48F206BF8B10071091A /* GPBCompileTest14.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest14.m; sourceTree = "<group>"; };
+		F40EE490206BF8B10071091A /* GPBCompileTest12.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest12.m; sourceTree = "<group>"; };
+		F40EE491206BF8B10071091A /* GPBCompileTest03.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest03.m; sourceTree = "<group>"; };
+		F40EE492206BF8B10071091A /* GPBCompileTest06.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest06.m; sourceTree = "<group>"; };
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+		F40EE507206C06440071091A /* GPBCompileTest25.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest25.m; sourceTree = "<group>"; };
+		F40EE508206C06440071091A /* GPBCompileTest24.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest24.m; sourceTree = "<group>"; };
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@@ -180,6 +231,7 @@
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+		F4584D7E1ECCB38900803AB6 /* GPBExtensionRegistryTest.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBExtensionRegistryTest.m; sourceTree = "<group>"; };
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@@ -393,6 +445,31 @@
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 				7461B69B0F94FDF800A0C422 /* GPBCodedInputStreamTests.m */,
 				7461B69D0F94FDF800A0C422 /* GPBCodedOuputStreamTests.m */,
+				F40EE488206BF8B00071091A /* GPBCompileTest01.m */,
+				F40EE481206BF8AE0071091A /* GPBCompileTest02.m */,
+				F40EE491206BF8B10071091A /* GPBCompileTest03.m */,
+				F40EE47E206BF8AE0071091A /* GPBCompileTest04.m */,
+				F40EE47F206BF8AE0071091A /* GPBCompileTest05.m */,
+				F40EE492206BF8B10071091A /* GPBCompileTest06.m */,
+				F40EE480206BF8AE0071091A /* GPBCompileTest07.m */,
+				F40EE47D206BF8AD0071091A /* GPBCompileTest08.m */,
+				F40EE484206BF8AF0071091A /* GPBCompileTest09.m */,
+				F40EE48C206BF8B00071091A /* GPBCompileTest10.m */,
+				F40EE493206BF8B20071091A /* GPBCompileTest11.m */,
+				F40EE490206BF8B10071091A /* GPBCompileTest12.m */,
+				F40EE483206BF8AF0071091A /* GPBCompileTest13.m */,
+				F40EE48F206BF8B10071091A /* GPBCompileTest14.m */,
+				F40EE489206BF8B00071091A /* GPBCompileTest15.m */,
+				F40EE48B206BF8B00071091A /* GPBCompileTest16.m */,
+				F40EE48D206BF8B00071091A /* GPBCompileTest17.m */,
+				F40EE48E206BF8B10071091A /* GPBCompileTest18.m */,
+				F40EE482206BF8AF0071091A /* GPBCompileTest19.m */,
+				F40EE485206BF8AF0071091A /* GPBCompileTest20.m */,
+				F40EE486206BF8AF0071091A /* GPBCompileTest21.m */,
+				F40EE48A206BF8B00071091A /* GPBCompileTest22.m */,
+				F40EE487206BF8B00071091A /* GPBCompileTest23.m */,
+				F40EE508206C06440071091A /* GPBCompileTest24.m */,
+				F40EE507206C06440071091A /* GPBCompileTest25.m */,
 				5102DABB1891A052002037B6 /* GPBConcurrencyTests.m */,
 				F4353D1C1AB8822D005A6198 /* GPBDescriptorTests.m */,
 				F4C4B9E21E1D974F00D3B61D /* GPBDictionaryTests.m */,
@@ -403,6 +480,7 @@
 				F4353D301AC06F10005A6198 /* GPBDictionaryTests+String.m */,
 				F4353D311AC06F10005A6198 /* GPBDictionaryTests+UInt32.m */,
 				F4353D321AC06F10005A6198 /* GPBDictionaryTests+UInt64.m */,
+				F4584D7E1ECCB38900803AB6 /* GPBExtensionRegistryTest.m */,
 				7461B6A30F94FDF800A0C422 /* GPBMessageTests.m */,
 				F4487C821AAF6AB300531423 /* GPBMessageTests+Merge.m */,
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@@ -418,8 +496,8 @@
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 				7461B6BC0F94FDF900A0C422 /* GPBWireFormatTests.m */,
-				F43C88CF191D77FC009E917D /* text_format_unittest_data.txt */,
 				F45E57C61AE6DC6A000B7D99 /* text_format_map_unittest_data.txt */,
+				F43C88CF191D77FC009E917D /* text_format_unittest_data.txt */,
 				8B7E6A7414893DBA00F8884A /* unittest_custom_options.proto */,
 				F4AC9E1D1A8BEB3500BD6E83 /* unittest_cycle.proto */,
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@@ -429,8 +507,8 @@
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-				8B09AAF614B663A7007B4184 /* unittest_objc.proto */,
 				F4CF31701B162ED800BD9B06 /* unittest_objc_startup.proto */,
+				8B09AAF614B663A7007B4184 /* unittest_objc.proto */,
 				8B7E6A7D14893DBC00F8884A /* unittest_optimize_for.proto */,
 				F4487C781AADFB3100531423 /* unittest_runtime_proto2.proto */,
 				F4487C791AADFB3200531423 /* unittest_runtime_proto3.proto */,
@@ -559,7 +637,7 @@
 			attributes = {
 				LastSwiftUpdateCheck = 0710;
 				LastTestingUpgradeCheck = 0600;
-				LastUpgradeCheck = 0800;
+				LastUpgradeCheck = 0930;
 				TargetAttributes = {
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@@ -658,27 +736,53 @@
 			buildActionMask = 2147483647;
 			files = (
 				8BBEA4A9147C727D00C4ADB7 /* GPBCodedInputStreamTests.m in Sources */,
+				F40EE50B206C06640071091A /* GPBCompileTest24.m in Sources */,
+				F40EE4BE206BF8B90071091A /* GPBCompileTest20.m in Sources */,
 				F401DC331A8E5C0200FCC765 /* GPBArrayTests.m in Sources */,
+				F40EE4B4206BF8B90071091A /* GPBCompileTest10.m in Sources */,
 				F4353D361AC06F10005A6198 /* GPBDictionaryTests+Int64.m in Sources */,
+				F40EE4C0206BF8B90071091A /* GPBCompileTest22.m in Sources */,
+				F40EE4B2206BF8B90071091A /* GPBCompileTest08.m in Sources */,
+				F40EE4BB206BF8B90071091A /* GPBCompileTest17.m in Sources */,
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 				8BBEA4AA147C727D00C4ADB7 /* GPBCodedOuputStreamTests.m in Sources */,
+				F40EE4C1206BF8B90071091A /* GPBCompileTest23.m in Sources */,
 				8BBEA4AC147C727D00C4ADB7 /* GPBMessageTests.m in Sources */,
 				F4B51B1E1BBC610700744318 /* GPBObjectiveCPlusPlusTest.mm in Sources */,
+				F40EE4BD206BF8B90071091A /* GPBCompileTest19.m in Sources */,
+				F40EE4B0206BF8B90071091A /* GPBCompileTest06.m in Sources */,
+				F40EE4B6206BF8B90071091A /* GPBCompileTest12.m in Sources */,
 				F4487C7F1AAF62CD00531423 /* GPBMessageTests+Serialization.m in Sources */,
+				F40EE4AD206BF8B90071091A /* GPBCompileTest03.m in Sources */,
+				F40EE4BC206BF8B90071091A /* GPBCompileTest18.m in Sources */,
+				F40EE4B7206BF8B90071091A /* GPBCompileTest13.m in Sources */,
+				F40EE4B9206BF8B90071091A /* GPBCompileTest15.m in Sources */,
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 				8B4248DC1A92933A00BC1EC6 /* GPBWellKnownTypesTest.m in Sources */,
+				F40EE4BF206BF8B90071091A /* GPBCompileTest21.m in Sources */,
+				F40EE4B5206BF8B90071091A /* GPBCompileTest11.m in Sources */,
 				F4F8D8831D789FD9002CE128 /* GPBUnittestProtos2.m in Sources */,
 				F4353D1D1AB8822D005A6198 /* GPBDescriptorTests.m in Sources */,
 				8B4248BB1A8C256A00BC1EC6 /* GPBSwiftTests.swift in Sources */,
+				F40EE50C206C06640071091A /* GPBCompileTest25.m in Sources */,
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 				5102DABC1891A073002037B6 /* GPBConcurrencyTests.m in Sources */,
 				F4487C751AADF7F500531423 /* GPBMessageTests+Runtime.m in Sources */,
+				F40EE4AC206BF8B90071091A /* GPBCompileTest02.m in Sources */,
 				F4353D351AC06F10005A6198 /* GPBDictionaryTests+Int32.m in Sources */,
+				F40EE4AF206BF8B90071091A /* GPBCompileTest05.m in Sources */,
+				F40EE4B8206BF8B90071091A /* GPBCompileTest14.m in Sources */,
 				8BBEA4B0147C727D00C4ADB7 /* GPBTestUtilities.m in Sources */,
+				F40EE4AE206BF8B90071091A /* GPBCompileTest04.m in Sources */,
+				F40EE4BA206BF8B90071091A /* GPBCompileTest16.m in Sources */,
 				F41C175D1833D3310064ED4D /* GPBPerfTests.m in Sources */,
 				F4353D341AC06F10005A6198 /* GPBDictionaryTests+Bool.m in Sources */,
 				F4487C831AAF6AB300531423 /* GPBMessageTests+Merge.m in Sources */,
+				F40EE4AB206BF8B90071091A /* GPBCompileTest01.m in Sources */,
 				8BBEA4B6147C727D00C4ADB7 /* GPBUnknownFieldSetTest.m in Sources */,
 				F4353D371AC06F10005A6198 /* GPBDictionaryTests+String.m in Sources */,
 				F4353D381AC06F10005A6198 /* GPBDictionaryTests+UInt32.m in Sources */,
+				F40EE4B3206BF8B90071091A /* GPBCompileTest09.m in Sources */,
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 				F4C4B9E41E1D976300D3B61D /* GPBDictionaryTests.m in Sources */,
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@@ -714,6 +818,7 @@
 		7461B52F0F94FAFA00A0C422 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = ProtocolBuffers;
@@ -723,6 +828,7 @@
 		7461B5300F94FAFA00A0C422 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = ProtocolBuffers;
@@ -733,6 +839,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = (
 					"${PROJECT_DERIVED_FILE_DIR}/protos",
@@ -759,6 +866,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = (
 					"${PROJECT_DERIVED_FILE_DIR}/protos",
@@ -790,6 +898,8 @@
 				CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES;
 				CLANG_STATIC_ANALYZER_MODE = deep;
 				CLANG_WARN_ASSIGN_ENUM = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -799,6 +909,8 @@
 				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES_AGGRESSIVE;
@@ -856,6 +968,8 @@
 				CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES;
 				CLANG_STATIC_ANALYZER_MODE = deep;
 				CLANG_WARN_ASSIGN_ENUM = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -865,6 +979,8 @@
 				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES_AGGRESSIVE;
@@ -913,6 +1029,7 @@
 		F4487C4F1A9F8E0200531423 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = TestSingleSourceBuild;
@@ -922,6 +1039,7 @@
 		F4487C501A9F8E0200531423 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				COMBINE_HIDPI_IMAGES = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = TestSingleSourceBuild;
@@ -931,12 +1049,14 @@
 		F45BBC151B0CE3C6002D064D /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		F45BBC161B0CE3C6002D064D /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
diff --git a/objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 00000000..18d98100
--- /dev/null
+++ b/objectivec/ProtocolBuffers_OSX.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme b/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
index 2f618131..6653a1b0 100644
--- a/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
+++ b/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -51,6 +51,12 @@
                   Identifier = "DescriptorTests">
                </Test>
                <Test
+                  Identifier = "GPBAutocreatedArrayTests">
+               </Test>
+               <Test
+                  Identifier = "GPBAutocreatedDictionaryTests">
+               </Test>
+               <Test
                   Identifier = "GPBBoolArrayTests">
                </Test>
                <Test
@@ -90,6 +96,9 @@
                   Identifier = "GPBEnumArrayTests">
                </Test>
                <Test
+                  Identifier = "GPBExtensionRegistryTest">
+               </Test>
+               <Test
                   Identifier = "GPBFloatArrayTests">
                </Test>
                <Test
diff --git a/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme b/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
index b1243b79..328771b8 100644
--- a/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
+++ b/objectivec/ProtocolBuffers_OSX.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -54,8 +54,8 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      codeCoverageEnabled = "YES">
+      codeCoverageEnabled = "YES"
+      shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
             skipped = "NO">
diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
index 64fc45c0..470652d0 100644
--- a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.pbxproj
@@ -25,13 +25,6 @@
 		8B79657B14992E3F002FFBFC /* GPBRootObject.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B79657914992E3E002FFBFC /* GPBRootObject.m */; };
 		8B8B615D17DF7056002EE618 /* GPBARCUnittestProtos.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B8B615C17DF7056002EE618 /* GPBARCUnittestProtos.m */; settings = {COMPILER_FLAGS = "-fobjc-arc"; }; };
 		8B96157414C8C38C00A2AC0B /* GPBDescriptor.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B96157314C8C38C00A2AC0B /* GPBDescriptor.m */; };
-		8B9742331A89D19F00DCE92C /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 8B9742321A89D19F00DCE92C /* LaunchScreen.xib */; };
-		8B9742431A8AAA7800DCE92C /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8B9742421A8AAA7800DCE92C /* CoreGraphics.framework */; };
-		8B9A5EA61831993600A9D33B /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
-		8B9A5EA81831993600A9D33B /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8B9A5E9F1831913D00A9D33B /* UIKit.framework */; };
-		8B9A5EAE1831993600A9D33B /* InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 8B9A5EAC1831993600A9D33B /* InfoPlist.strings */; };
-		8B9A5EB41831993600A9D33B /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B9A5EB31831993600A9D33B /* AppDelegate.m */; };
-		8B9A5EB61831993600A9D33B /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 8B9A5EB51831993600A9D33B /* Images.xcassets */; };
 		8B9A5EEC18330A0F00A9D33B /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8B9A5E9F1831913D00A9D33B /* UIKit.framework */; };
 		8BBEA4A9147C727D00C4ADB7 /* GPBCodedInputStreamTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B69B0F94FDF800A0C422 /* GPBCodedInputStreamTests.m */; };
 		8BBEA4AA147C727D00C4ADB7 /* GPBCodedOuputStreamTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 7461B69D0F94FDF800A0C422 /* GPBCodedOuputStreamTests.m */; };
@@ -44,6 +37,31 @@
 		8BD3981F14BE59D70081D629 /* GPBUnittestProtos.m in Sources */ = {isa = PBXBuildFile; fileRef = 8BD3981E14BE59D70081D629 /* GPBUnittestProtos.m */; };
 		8BF8193514A0DDA600A2C982 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
 		F401DC351A8E5C6F00FCC765 /* GPBArrayTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F401DC341A8E5C6F00FCC765 /* GPBArrayTests.m */; };
+		F40EE4F0206BF91E0071091A /* GPBCompileTest01.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CD206BF9170071091A /* GPBCompileTest01.m */; };
+		F40EE4F1206BF91E0071091A /* GPBCompileTest02.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C6206BF9170071091A /* GPBCompileTest02.m */; };
+		F40EE4F2206BF91E0071091A /* GPBCompileTest03.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D6206BF9190071091A /* GPBCompileTest03.m */; };
+		F40EE4F3206BF91E0071091A /* GPBCompileTest04.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C3206BF9160071091A /* GPBCompileTest04.m */; };
+		F40EE4F4206BF91E0071091A /* GPBCompileTest05.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C4206BF9160071091A /* GPBCompileTest05.m */; };
+		F40EE4F5206BF91E0071091A /* GPBCompileTest06.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D7206BF9190071091A /* GPBCompileTest06.m */; };
+		F40EE4F6206BF91E0071091A /* GPBCompileTest07.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C5206BF9170071091A /* GPBCompileTest07.m */; };
+		F40EE4F7206BF91E0071091A /* GPBCompileTest08.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C2206BF9160071091A /* GPBCompileTest08.m */; };
+		F40EE4F8206BF91E0071091A /* GPBCompileTest09.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C9206BF9170071091A /* GPBCompileTest09.m */; };
+		F40EE4F9206BF91E0071091A /* GPBCompileTest10.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D1206BF9180071091A /* GPBCompileTest10.m */; };
+		F40EE4FA206BF91E0071091A /* GPBCompileTest11.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D8206BF9190071091A /* GPBCompileTest11.m */; };
+		F40EE4FB206BF91E0071091A /* GPBCompileTest12.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D5206BF9180071091A /* GPBCompileTest12.m */; };
+		F40EE4FC206BF91E0071091A /* GPBCompileTest13.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C8206BF9170071091A /* GPBCompileTest13.m */; };
+		F40EE4FD206BF91E0071091A /* GPBCompileTest14.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D4206BF9180071091A /* GPBCompileTest14.m */; };
+		F40EE4FE206BF91E0071091A /* GPBCompileTest15.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CE206BF9170071091A /* GPBCompileTest15.m */; };
+		F40EE4FF206BF91E0071091A /* GPBCompileTest16.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D0206BF9180071091A /* GPBCompileTest16.m */; };
+		F40EE500206BF91E0071091A /* GPBCompileTest17.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D2206BF9180071091A /* GPBCompileTest17.m */; };
+		F40EE501206BF91E0071091A /* GPBCompileTest18.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4D3206BF9180071091A /* GPBCompileTest18.m */; };
+		F40EE502206BF91E0071091A /* GPBCompileTest19.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4C7206BF9170071091A /* GPBCompileTest19.m */; };
+		F40EE503206BF91E0071091A /* GPBCompileTest20.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CA206BF9170071091A /* GPBCompileTest20.m */; };
+		F40EE504206BF91E0071091A /* GPBCompileTest21.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CB206BF9170071091A /* GPBCompileTest21.m */; };
+		F40EE505206BF91E0071091A /* GPBCompileTest22.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CF206BF9170071091A /* GPBCompileTest22.m */; };
+		F40EE506206BF91E0071091A /* GPBCompileTest23.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE4CC206BF9170071091A /* GPBCompileTest23.m */; };
+		F40EE511206C068D0071091A /* GPBCompileTest24.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE50E206C06880071091A /* GPBCompileTest24.m */; };
+		F40EE512206C068D0071091A /* GPBCompileTest25.m in Sources */ = {isa = PBXBuildFile; fileRef = F40EE50D206C06880071091A /* GPBCompileTest25.m */; };
 		F41C175D1833D3310064ED4D /* GPBPerfTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F41C175C1833D3310064ED4D /* GPBPerfTests.m */; };
 		F4353D1F1AB88243005A6198 /* GPBDescriptorTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F4353D1E1AB88243005A6198 /* GPBDescriptorTests.m */; };
 		F4353D271ABB156F005A6198 /* GPBDictionary.m in Sources */ = {isa = PBXBuildFile; fileRef = F4353D251ABB156F005A6198 /* GPBDictionary.m */; };
@@ -60,6 +78,7 @@
 		F4487C771AADF84900531423 /* GPBMessageTests+Runtime.m in Sources */ = {isa = PBXBuildFile; fileRef = F4487C761AADF84900531423 /* GPBMessageTests+Runtime.m */; };
 		F4487C811AAF62FC00531423 /* GPBMessageTests+Serialization.m in Sources */ = {isa = PBXBuildFile; fileRef = F4487C801AAF62FC00531423 /* GPBMessageTests+Serialization.m */; };
 		F4487C851AAF6AC500531423 /* GPBMessageTests+Merge.m in Sources */ = {isa = PBXBuildFile; fileRef = F4487C841AAF6AC500531423 /* GPBMessageTests+Merge.m */; };
+		F4584D831ECCB53600803AB6 /* GPBExtensionRegistryTest.m in Sources */ = {isa = PBXBuildFile; fileRef = F4584D801ECCB39E00803AB6 /* GPBExtensionRegistryTest.m */; };
 		F45C69CC16DFD08D0081955B /* GPBExtensionInternals.m in Sources */ = {isa = PBXBuildFile; fileRef = F45C69CB16DFD08D0081955B /* GPBExtensionInternals.m */; };
 		F45E57C91AE6DC98000B7D99 /* text_format_map_unittest_data.txt in Resources */ = {isa = PBXBuildFile; fileRef = F45E57C81AE6DC98000B7D99 /* text_format_map_unittest_data.txt */; };
 		F47476E91D21A537007C7B1A /* Duration.pbobjc.m in Sources */ = {isa = PBXBuildFile; fileRef = 8B4248DE1A929C7D00BC1EC6 /* Duration.pbobjc.m */; };
@@ -78,13 +97,6 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
-		8B9A5ED01831994600A9D33B /* PBXContainerItemProxy */ = {
-			isa = PBXContainerItemProxy;
-			containerPortal = 29B97313FDCFA39411CA2CEA /* Project object */;
-			proxyType = 1;
-			remoteGlobalIDString = 8B9A5EA41831993600A9D33B;
-			remoteInfo = iOSTestHarness;
-		};
 		8BBEA4BC147C729A00C4ADB7 /* PBXContainerItemProxy */ = {
 			isa = PBXContainerItemProxy;
 			containerPortal = 29B97313FDCFA39411CA2CEA /* Project object */;
@@ -162,14 +174,8 @@
 		8B8B615C17DF7056002EE618 /* GPBARCUnittestProtos.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBARCUnittestProtos.m; sourceTree = "<group>"; };
 		8B96157214C8B06000A2AC0B /* GPBDescriptor.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GPBDescriptor.h; sourceTree = "<group>"; };
 		8B96157314C8C38C00A2AC0B /* GPBDescriptor.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBDescriptor.m; sourceTree = "<group>"; };
-		8B9742321A89D19F00DCE92C /* LaunchScreen.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = LaunchScreen.xib; sourceTree = "<group>"; };
 		8B9742421A8AAA7800DCE92C /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = System/Library/Frameworks/CoreGraphics.framework; sourceTree = SDKROOT; };
 		8B9A5E9F1831913D00A9D33B /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
-		8B9A5EA51831993600A9D33B /* iOSTestHarness.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = iOSTestHarness.app; sourceTree = BUILT_PRODUCTS_DIR; };
-		8B9A5EAB1831993600A9D33B /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
-		8B9A5EAD1831993600A9D33B /* en */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = en; path = en.lproj/InfoPlist.strings; sourceTree = "<group>"; };
-		8B9A5EB31831993600A9D33B /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
-		8B9A5EB51831993600A9D33B /* Images.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Images.xcassets; sourceTree = "<group>"; };
 		8BBD9DB016DD1DC8008E1EC1 /* unittest_lite.proto */ = {isa = PBXFileReference; lastKnownFileType = text; name = unittest_lite.proto; path = ../../src/google/protobuf/unittest_lite.proto; sourceTree = "<group>"; };
 		8BBEA4A6147C727100C4ADB7 /* UnitTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = UnitTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		8BCF338814ED799900BC5317 /* GPBProtocolBuffers.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = GPBProtocolBuffers.m; sourceTree = "<group>"; };
@@ -177,6 +183,31 @@
 		8BD3981E14BE59D70081D629 /* GPBUnittestProtos.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBUnittestProtos.m; sourceTree = "<group>"; };
 		8BEB5AE01498033E0078BF9D /* GPBRuntimeTypes.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GPBRuntimeTypes.h; sourceTree = "<group>"; };
 		F401DC341A8E5C6F00FCC765 /* GPBArrayTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBArrayTests.m; sourceTree = "<group>"; };
+		F40EE4C2206BF9160071091A /* GPBCompileTest08.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest08.m; sourceTree = "<group>"; };
+		F40EE4C3206BF9160071091A /* GPBCompileTest04.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest04.m; sourceTree = "<group>"; };
+		F40EE4C4206BF9160071091A /* GPBCompileTest05.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest05.m; sourceTree = "<group>"; };
+		F40EE4C5206BF9170071091A /* GPBCompileTest07.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest07.m; sourceTree = "<group>"; };
+		F40EE4C6206BF9170071091A /* GPBCompileTest02.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest02.m; sourceTree = "<group>"; };
+		F40EE4C7206BF9170071091A /* GPBCompileTest19.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest19.m; sourceTree = "<group>"; };
+		F40EE4C8206BF9170071091A /* GPBCompileTest13.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest13.m; sourceTree = "<group>"; };
+		F40EE4C9206BF9170071091A /* GPBCompileTest09.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest09.m; sourceTree = "<group>"; };
+		F40EE4CA206BF9170071091A /* GPBCompileTest20.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest20.m; sourceTree = "<group>"; };
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+		F40EE50E206C06880071091A /* GPBCompileTest24.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GPBCompileTest24.m; sourceTree = "<group>"; };
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@@ -202,6 +233,7 @@
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+				F40EE4CD206BF9170071091A /* GPBCompileTest01.m */,
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+				F40EE4D5206BF9180071091A /* GPBCompileTest12.m */,
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+				F40EE4D4206BF9180071091A /* GPBCompileTest14.m */,
+				F40EE4CE206BF9170071091A /* GPBCompileTest15.m */,
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+				F40EE4D2206BF9180071091A /* GPBCompileTest17.m */,
+				F40EE4D3206BF9180071091A /* GPBCompileTest18.m */,
+				F40EE4C7206BF9170071091A /* GPBCompileTest19.m */,
+				F40EE4CA206BF9170071091A /* GPBCompileTest20.m */,
+				F40EE4CB206BF9170071091A /* GPBCompileTest21.m */,
+				F40EE4CF206BF9170071091A /* GPBCompileTest22.m */,
+				F40EE4CC206BF9170071091A /* GPBCompileTest23.m */,
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-				8B09AAF614B663A7007B4184 /* unittest_objc.proto */,
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+				8B09AAF614B663A7007B4184 /* unittest_objc.proto */,
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@@ -479,26 +525,6 @@
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-		8B9A5EA91831993600A9D33B /* iOSTestHarness */ = {
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@@ -573,23 +599,6 @@
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-			buildConfigurationList = 8B9A5ECA1831993600A9D33B /* Build configuration list for PBXNativeTarget "iOSTestHarness" */;
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 				LastTestingUpgradeCheck = 0600;
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@@ -660,7 +668,6 @@
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 			buildActionMask = 2147483647;
 			files = (
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 				8B4248B41A8BD96E00BC1EC6 /* GPBSwiftTests.swift in Sources */,
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 				F4487C771AADF84900531423 /* GPBMessageTests+Runtime.m in Sources */,
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 				8BBEA4B0147C727D00C4ADB7 /* GPBTestUtilities.m in Sources */,
+				F40EE4F3206BF91E0071091A /* GPBCompileTest04.m in Sources */,
+				F40EE4FF206BF91E0071091A /* GPBCompileTest16.m in Sources */,
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 				F4353D421AC06F31005A6198 /* GPBDictionaryTests+Bool.m in Sources */,
 				F4487C851AAF6AC500531423 /* GPBMessageTests+Merge.m in Sources */,
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 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
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-			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/iOSTestHarness/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.google.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				TARGETED_DEVICE_FAMILY = "1,2";
-				WRAPPER_EXTENSION = app;
-			};
-			name = Debug;
-		};
-		8B9A5ECC1831993600A9D33B /* Release */ = {
-			isa = XCBuildConfiguration;
-			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage;
-				CLANG_ENABLE_OBJC_ARC = YES;
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/iOSTestHarness/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.google.${PRODUCT_NAME:rfc1034identifier}";
-				PRODUCT_NAME = "$(TARGET_NAME)";
-				TARGETED_DEVICE_FAMILY = "1,2";
-				WRAPPER_EXTENSION = app;
-			};
-			name = Release;
-		};
 		8BBEA4A7147C727100C4ADB7 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				FRAMEWORK_SEARCH_PATHS = (
-					"\"$(SDKROOT)/Developer/Library/Frameworks\"",
 					"\"$(DEVELOPER_LIBRARY_DIR)/Frameworks\"",
 					"$(inherited)",
 				);
@@ -897,7 +868,6 @@
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/iOSTestHarness.app/iOSTestHarness";
 				WARNING_CFLAGS = (
 					"$(inherited)",
 					"-Wno-documentation-unknown-command",
@@ -911,8 +881,8 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				FRAMEWORK_SEARCH_PATHS = (
-					"\"$(SDKROOT)/Developer/Library/Frameworks\"",
 					"\"$(DEVELOPER_LIBRARY_DIR)/Frameworks\"",
 					"$(inherited)",
 				);
@@ -932,7 +902,6 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Tests/UnitTests-Bridging-Header.h";
 				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/iOSTestHarness.app/iOSTestHarness";
 				WARNING_CFLAGS = (
 					"$(inherited)",
 					"-Wno-documentation-unknown-command",
@@ -952,6 +921,8 @@
 				CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES;
 				CLANG_STATIC_ANALYZER_MODE = deep;
 				CLANG_WARN_ASSIGN_ENUM = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -961,6 +932,8 @@
 				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES_AGGRESSIVE;
@@ -1019,6 +992,8 @@
 				CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES;
 				CLANG_STATIC_ANALYZER_MODE = deep;
 				CLANG_WARN_ASSIGN_ENUM = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -1028,6 +1003,8 @@
 				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES_AGGRESSIVE;
@@ -1077,6 +1054,7 @@
 		F4487C6C1A9F8F8100531423 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = TestSingleSourceBuild;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -1086,6 +1064,7 @@
 		F4487C6D1A9F8F8100531423 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				HEADER_SEARCH_PATHS = "$(SRCROOT)";
 				PRODUCT_NAME = TestSingleSourceBuild;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -1095,12 +1074,14 @@
 		F45BBC0F1B0CDB50002D064D /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Debug;
 		};
 		F45BBC101B0CDB50002D064D /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_ENABLE_OBJC_WEAK = YES;
 			};
 			name = Release;
 		};
@@ -1116,15 +1097,6 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		8B9A5ECA1831993600A9D33B /* Build configuration list for PBXNativeTarget "iOSTestHarness" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				8B9A5ECB1831993600A9D33B /* Debug */,
-				8B9A5ECC1831993600A9D33B /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
 		8BBEA4BA147C728600C4ADB7 /* Build configuration list for PBXNativeTarget "UnitTests" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 00000000..18d98100
--- /dev/null
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme b/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
index be31c308..77483d38 100644
--- a/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/PerformanceTests.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -51,6 +51,12 @@
                   Identifier = "DescriptorTests">
                </Test>
                <Test
+                  Identifier = "GPBAutocreatedArrayTests">
+               </Test>
+               <Test
+                  Identifier = "GPBAutocreatedDictionaryTests">
+               </Test>
+               <Test
                   Identifier = "GPBBoolArrayTests">
                </Test>
                <Test
@@ -90,6 +96,9 @@
                   Identifier = "GPBEnumArrayTests">
                </Test>
                <Test
+                  Identifier = "GPBExtensionRegistryTest">
+               </Test>
+               <Test
                   Identifier = "GPBFloatArrayTests">
                </Test>
                <Test
diff --git a/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme b/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
index edbe6898..bacbcba3 100644
--- a/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
+++ b/objectivec/ProtocolBuffers_iOS.xcodeproj/xcshareddata/xcschemes/ProtocolBuffers.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0800"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -54,8 +54,8 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      codeCoverageEnabled = "YES">
+      codeCoverageEnabled = "YES"
+      shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -95,16 +95,15 @@
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
-      <BuildableProductRunnable
-         runnableDebuggingMode = "0">
+      <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "8B9A5EA41831993600A9D33B"
-            BuildableName = "iOSTestHarness.app"
-            BlueprintName = "iOSTestHarness"
+            BlueprintIdentifier = "7461B52D0F94FAF800A0C422"
+            BuildableName = "libProtocolBuffers.a"
+            BlueprintName = "ProtocolBuffers"
             ReferencedContainer = "container:ProtocolBuffers_iOS.xcodeproj">
          </BuildableReference>
-      </BuildableProductRunnable>
+      </MacroExpansion>
       <AdditionalOptions>
       </AdditionalOptions>
    </LaunchAction>
diff --git a/objectivec/README.md b/objectivec/README.md
index 7226f0b9..21ac07d8 100644
--- a/objectivec/README.md
+++ b/objectivec/README.md
@@ -13,16 +13,17 @@ Requirements
 The Objective C implementation requires:
 
 - Objective C 2.0 Runtime (32bit & 64bit iOS, 64bit OS X).
-- Xcode 7.0 (or later).
+- Xcode 8.0 (or later).
 - The library code does *not* use ARC (for performance reasons), but it all can
   be called from ARC code.
 
 Installation
 ------------
 
-The full distribution pulled from github includes the sources for both the
-compiler (protoc) and the runtime (this directory). To build the compiler
-and run the runtime tests, you can use:
+The distribution pulled from github includes the sources for both the
+compiler (protoc) and the runtime (this directory). After cloning the distribution
+and needed submodules ([see the src directory's README](../src/README.md)),
+to build the compiler and run the runtime tests, you can use:
 
      $ objectivec/DevTools/full_mac_build.sh
 
@@ -33,19 +34,21 @@ Building
 
 There are two ways to include the Runtime sources in your project:
 
-Add `objectivec/\*.h` & `objectivec/GPBProtocolBuffers.m` to your project.
+Add `objectivec/*.h`, `objectivec/google/protobuf/*.pbobjc.h`, and
+`objectivec/GPBProtocolBuffers.m` to your project.
 
 *or*
 
-Add `objectivec/\*.h` & `objectivec/\*.m` except for
+Add `objectivec/*.h`, `objectivec/google/protobuf/*.pbobjc.h`,
+`objectivec/google/protobuf/*.pbobjc.m`, and `objectivec/*.m` except for
 `objectivec/GPBProtocolBuffers.m` to your project.
 
 
 If the target is using ARC, remember to turn off ARC (`-fno-objc-arc`) for the
 `.m` files.
 
-The files generated by `protoc` for the `*.proto` files (`\*.pbobjc.h` and
-`\*.pbobjc.m`) are then also added to the target.
+The files generated by `protoc` for the `*.proto` files (`*.pbobjc.h` and
+`*.pbobjc.m`) are then also added to the target.
 
 Usage
 -----
diff --git a/objectivec/Tests/GPBArrayTests.m b/objectivec/Tests/GPBArrayTests.m
index 31f75501..e414d90a 100644
--- a/objectivec/Tests/GPBArrayTests.m
+++ b/objectivec/Tests/GPBArrayTests.m
@@ -39,6 +39,7 @@
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBEnumArray (TestingTweak)
 + (instancetype)arrayWithValue:(int32_t)value;
++ (instancetype)arrayWithCapacity:(NSUInteger)count;
 - (instancetype)initWithValues:(const int32_t [])values
                          count:(NSUInteger)count;
 @end
@@ -72,6 +73,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                          rawValues:&value
                                              count:1] autorelease];
 }
++ (instancetype)arrayWithCapacity:(NSUInteger)count {
+  return [[[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
+                                          capacity:count] autorelease];
+}
 - (instancetype)initWithValues:(const int32_t [])values
                          count:(NSUInteger)count {
   return [self initWithValidationFunction:TestingEnum_IsValidValue
@@ -177,6 +182,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 //%    XCTAssertNotEqual(idx, 0U);
 //%    ++idx2;
 //%  }];
+//%  // Ensure description doesn't choke.
+//%  XCTAssertTrue(array.description.length > 10);
 //%  [array release];
 //%}
 //%
@@ -201,6 +208,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 //%            NAME$S                     count:GPBARRAYSIZE(kValues3)];
 //%  XCTAssertNotNil(array3);
 //%
+//%  // Identity
+//%  XCTAssertTrue([array1 isEqual:array1]);
+//%  // Wrong type doesn't blow up.
+//%  XCTAssertFalse([array1 isEqual:@"bogus"]);
 //%  // 1/1Prime should be different objects, but equal.
 //%  XCTAssertNotEqual(array1, array1prime);
 //%  XCTAssertEqualObjects(array1, array1prime);
@@ -271,6 +282,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 //%  [array add##HELPER##ValuesFromArray:array2];
 //%  XCTAssertEqual(array.count, 5U);
 //%
+//%  // Zero/nil inputs do nothing.
+//%  [array addValues:kValues1 count:0];
+//%  XCTAssertEqual(array.count, 5U);
+//%  [array addValues:NULL count:5];
+//%  XCTAssertEqual(array.count, 5U);
+//%
 //%  XCTAssertEqual([array valueAtIndex:0], VAL1);
 //%  XCTAssertEqual([array valueAtIndex:1], VAL2);
 //%  XCTAssertEqual([array valueAtIndex:2], VAL3);
@@ -391,9 +408,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 //%- (void)testInternalResizing {
 //%  const TYPE kValues[] = { VAL1, VAL2, VAL3, VAL4 };
 //%  GPB##NAME##Array *array =
-//%      [[GPB##NAME##Array alloc] initWithValues:kValues
-//%            NAME$S                     count:GPBARRAYSIZE(kValues)];
+//%      [GPB##NAME##Array arrayWithCapacity:GPBARRAYSIZE(kValues)];
 //%  XCTAssertNotNil(array);
+//%  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 //%
 //%  // Add/remove to trigger the intneral buffer to grow/shrink.
 //%  for (int i = 0; i < 100; ++i) {
@@ -410,7 +427,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 //%  XCTAssertEqual(array.count, 404U);
 //%  [array removeAll];
 //%  XCTAssertEqual(array.count, 0U);
-//%  [array release];
 //%}
 //%
 //%@end
@@ -510,6 +526,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -534,6 +552,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                       count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -604,6 +626,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 1);
   XCTAssertEqual([array valueAtIndex:1], 2);
   XCTAssertEqual([array valueAtIndex:2], 3);
@@ -724,9 +752,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const int32_t kValues[] = { 1, 2, 3, 4 };
   GPBInt32Array *array =
-      [[GPBInt32Array alloc] initWithValues:kValues
-                                      count:GPBARRAYSIZE(kValues)];
+      [GPBInt32Array arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -743,7 +771,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -843,6 +870,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -867,6 +896,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                        count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -937,6 +970,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 11U);
   XCTAssertEqual([array valueAtIndex:1], 12U);
   XCTAssertEqual([array valueAtIndex:2], 13U);
@@ -1057,9 +1096,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const uint32_t kValues[] = { 11U, 12U, 13U, 14U };
   GPBUInt32Array *array =
-      [[GPBUInt32Array alloc] initWithValues:kValues
-                                       count:GPBARRAYSIZE(kValues)];
+      [GPBUInt32Array arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -1076,7 +1115,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -1176,6 +1214,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -1200,6 +1240,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                       count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -1270,6 +1314,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 31LL);
   XCTAssertEqual([array valueAtIndex:1], 32LL);
   XCTAssertEqual([array valueAtIndex:2], 33LL);
@@ -1390,9 +1440,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const int64_t kValues[] = { 31LL, 32LL, 33LL, 34LL };
   GPBInt64Array *array =
-      [[GPBInt64Array alloc] initWithValues:kValues
-                                      count:GPBARRAYSIZE(kValues)];
+      [GPBInt64Array arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -1409,7 +1459,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -1509,6 +1558,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -1533,6 +1584,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                        count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -1603,6 +1658,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 41ULL);
   XCTAssertEqual([array valueAtIndex:1], 42ULL);
   XCTAssertEqual([array valueAtIndex:2], 43ULL);
@@ -1723,9 +1784,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const uint64_t kValues[] = { 41ULL, 42ULL, 43ULL, 44ULL };
   GPBUInt64Array *array =
-      [[GPBUInt64Array alloc] initWithValues:kValues
-                                       count:GPBARRAYSIZE(kValues)];
+      [GPBUInt64Array arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -1742,7 +1803,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -1842,6 +1902,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -1866,6 +1928,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                       count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -1936,6 +2002,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 51.f);
   XCTAssertEqual([array valueAtIndex:1], 52.f);
   XCTAssertEqual([array valueAtIndex:2], 53.f);
@@ -2056,9 +2128,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const float kValues[] = { 51.f, 52.f, 53.f, 54.f };
   GPBFloatArray *array =
-      [[GPBFloatArray alloc] initWithValues:kValues
-                                      count:GPBARRAYSIZE(kValues)];
+      [GPBFloatArray arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -2075,7 +2147,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -2175,6 +2246,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -2199,6 +2272,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                        count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -2269,6 +2346,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 61.);
   XCTAssertEqual([array valueAtIndex:1], 62.);
   XCTAssertEqual([array valueAtIndex:2], 63.);
@@ -2389,9 +2472,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const double kValues[] = { 61., 62., 63., 64. };
   GPBDoubleArray *array =
-      [[GPBDoubleArray alloc] initWithValues:kValues
-                                       count:GPBARRAYSIZE(kValues)];
+      [GPBDoubleArray arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -2408,7 +2491,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -2508,6 +2590,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -2532,6 +2616,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                      count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -2602,6 +2690,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], TRUE);
   XCTAssertEqual([array valueAtIndex:1], TRUE);
   XCTAssertEqual([array valueAtIndex:2], FALSE);
@@ -2722,9 +2816,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const BOOL kValues[] = { TRUE, TRUE, FALSE, FALSE };
   GPBBoolArray *array =
-      [[GPBBoolArray alloc] initWithValues:kValues
-                                     count:GPBARRAYSIZE(kValues)];
+      [GPBBoolArray arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -2741,7 +2835,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
@@ -2841,6 +2934,8 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
     XCTAssertNotEqual(idx, 0U);
     ++idx2;
   }];
+  // Ensure description doesn't choke.
+  XCTAssertTrue(array.description.length > 10);
   [array release];
 }
 
@@ -2865,6 +2960,10 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
                                      count:GPBARRAYSIZE(kValues3)];
   XCTAssertNotNil(array3);
 
+  // Identity
+  XCTAssertTrue([array1 isEqual:array1]);
+  // Wrong type doesn't blow up.
+  XCTAssertFalse([array1 isEqual:@"bogus"]);
   // 1/1Prime should be different objects, but equal.
   XCTAssertNotEqual(array1, array1prime);
   XCTAssertEqualObjects(array1, array1prime);
@@ -2935,6 +3034,12 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   [array addRawValuesFromArray:array2];
   XCTAssertEqual(array.count, 5U);
 
+  // Zero/nil inputs do nothing.
+  [array addValues:kValues1 count:0];
+  XCTAssertEqual(array.count, 5U);
+  [array addValues:NULL count:5];
+  XCTAssertEqual(array.count, 5U);
+
   XCTAssertEqual([array valueAtIndex:0], 71);
   XCTAssertEqual([array valueAtIndex:1], 72);
   XCTAssertEqual([array valueAtIndex:2], 73);
@@ -3055,9 +3160,9 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
 - (void)testInternalResizing {
   const int32_t kValues[] = { 71, 72, 73, 74 };
   GPBEnumArray *array =
-      [[GPBEnumArray alloc] initWithValues:kValues
-                                     count:GPBARRAYSIZE(kValues)];
+      [GPBEnumArray arrayWithCapacity:GPBARRAYSIZE(kValues)];
   XCTAssertNotNil(array);
+  [array addValues:kValues count:GPBARRAYSIZE(kValues)];
 
   // Add/remove to trigger the intneral buffer to grow/shrink.
   for (int i = 0; i < 100; ++i) {
@@ -3074,7 +3179,6 @@ static BOOL TestingEnum_IsValidValue2(int32_t value) {
   XCTAssertEqual(array.count, 404U);
   [array removeAll];
   XCTAssertEqual(array.count, 0U);
-  [array release];
 }
 
 @end
diff --git a/objectivec/Tests/GPBCodedInputStreamTests.m b/objectivec/Tests/GPBCodedInputStreamTests.m
index cc402156..f5aa6903 100644
--- a/objectivec/Tests/GPBCodedInputStreamTests.m
+++ b/objectivec/Tests/GPBCodedInputStreamTests.m
@@ -62,52 +62,101 @@
 #define bytes(...) [self bytes_with_sentinel:0, __VA_ARGS__, 256]
 
 - (void)testDecodeZigZag {
-  XCTAssertEqual(0, GPBDecodeZigZag32(0));
-  XCTAssertEqual(-1, GPBDecodeZigZag32(1));
-  XCTAssertEqual(1, GPBDecodeZigZag32(2));
-  XCTAssertEqual(-2, GPBDecodeZigZag32(3));
-  XCTAssertEqual((int32_t)0x3FFFFFFF, GPBDecodeZigZag32(0x7FFFFFFE));
-  XCTAssertEqual((int32_t)0xC0000000, GPBDecodeZigZag32(0x7FFFFFFF));
-  XCTAssertEqual((int32_t)0x7FFFFFFF, GPBDecodeZigZag32(0xFFFFFFFE));
-  XCTAssertEqual((int32_t)0x80000000, GPBDecodeZigZag32(0xFFFFFFFF));
-
-  XCTAssertEqual((int64_t)0, GPBDecodeZigZag64(0));
-  XCTAssertEqual((int64_t)-1, GPBDecodeZigZag64(1));
-  XCTAssertEqual((int64_t)1, GPBDecodeZigZag64(2));
-  XCTAssertEqual((int64_t)-2, GPBDecodeZigZag64(3));
-  XCTAssertEqual((int64_t)0x000000003FFFFFFFL,
-                 GPBDecodeZigZag64(0x000000007FFFFFFEL));
-  XCTAssertEqual((int64_t)0xFFFFFFFFC0000000L,
-                 GPBDecodeZigZag64(0x000000007FFFFFFFL));
-  XCTAssertEqual((int64_t)0x000000007FFFFFFFL,
-                 GPBDecodeZigZag64(0x00000000FFFFFFFEL));
-  XCTAssertEqual((int64_t)0xFFFFFFFF80000000L,
-                 GPBDecodeZigZag64(0x00000000FFFFFFFFL));
-  XCTAssertEqual((int64_t)0x7FFFFFFFFFFFFFFFL,
-                 GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFEL));
-  XCTAssertEqual((int64_t)0x8000000000000000L,
-                 GPBDecodeZigZag64(0xFFFFFFFFFFFFFFFFL));
+  [self assertReadZigZag32:bytes(0x0) value:0];
+  [self assertReadZigZag32:bytes(0x1) value:-1];
+  [self assertReadZigZag32:bytes(0x2) value:1];
+  [self assertReadZigZag32:bytes(0x3) value:-2];
+
+  [self assertReadZigZag32:bytes(0xFE, 0xFF, 0xFF, 0xFF, 0x07) value:(int32_t)0x3FFFFFFF];
+  [self assertReadZigZag32:bytes(0xFF, 0xFF, 0xFF, 0xFF, 0x07) value:(int32_t)0xC0000000];
+  [self assertReadZigZag32:bytes(0xFE, 0xFF, 0xFF, 0xFF, 0x0F) value:(int32_t)0x7FFFFFFF];
+  [self assertReadZigZag32:bytes(0xFF, 0xFF, 0xFF, 0xFF, 0x0F) value:(int32_t)0x80000000];
+
+  [self assertReadZigZag64:bytes(0x0) value:0];
+  [self assertReadZigZag64:bytes(0x1) value:-1];
+  [self assertReadZigZag64:bytes(0x2) value:1];
+  [self assertReadZigZag64:bytes(0x3) value:-2];
+
+  [self assertReadZigZag64:bytes(0xFE, 0xFF, 0xFF, 0xFF, 0x07) value:(int32_t)0x3FFFFFFF];
+  [self assertReadZigZag64:bytes(0xFF, 0xFF, 0xFF, 0xFF, 0x07) value:(int32_t)0xC0000000];
+  [self assertReadZigZag64:bytes(0xFE, 0xFF, 0xFF, 0xFF, 0x0F) value:(int32_t)0x7FFFFFFF];
+  [self assertReadZigZag64:bytes(0xFF, 0xFF, 0xFF, 0xFF, 0x0F) value:(int32_t)0x80000000];
+
+  [self assertReadZigZag64:bytes(0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01) value:0x7FFFFFFFFFFFFFFFL];
+  [self assertReadZigZag64:bytes(0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01) value:0x8000000000000000L];
 }
 
 - (void)assertReadVarint:(NSData*)data value:(int64_t)value {
-  {
+  if (value <= INT32_MAX && value >= INT32_MIN) {
+    {
+      GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+      XCTAssertEqual((int32_t)value, [input readInt32]);
+    }
+    {
+      GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+      XCTAssertEqual((int32_t)value, [input readEnum]);
+    }
+  }
+  if (value <= UINT32_MAX && value >= 0) {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
-    XCTAssertEqual((int32_t)value, [input readInt32]);
+    XCTAssertEqual((uint32_t)value, [input readUInt32]);
   }
   {
     GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
     XCTAssertEqual(value, [input readInt64]);
   }
+  if (value >= 0) {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual((uint64_t)value, [input readUInt64]);
+  }
 }
 
 - (void)assertReadLittleEndian32:(NSData*)data value:(int32_t)value {
-  GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
-  XCTAssertEqual(value, [input readSFixed32]);
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value, [input readSFixed32]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(GPBConvertInt32ToFloat(value), [input readFloat]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual((uint32_t)value, [input readFixed32]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value, [input readSFixed32]);
+  }
 }
 
 - (void)assertReadLittleEndian64:(NSData*)data value:(int64_t)value {
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value, [input readSFixed64]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(GPBConvertInt64ToDouble(value), [input readDouble]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual((uint64_t)value, [input readFixed64]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value, [input readSFixed64]);
+  }
+}
+
+- (void)assertReadZigZag32:(NSData*)data value:(int64_t)value {
+  GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+  XCTAssertEqual((int32_t)value, [input readSInt32]);
+}
+
+- (void)assertReadZigZag64:(NSData*)data value:(int64_t)value {
   GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
-  XCTAssertEqual(value, [input readSFixed64]);
+  XCTAssertEqual(value, [input readSInt64]);
 }
 
 - (void)assertReadVarintFailure:(NSData*)data {
@@ -128,12 +177,28 @@
   XCTAssertEqual(((uint8_t*)data.bytes)[1], (uint8_t)0x74);
 }
 
+- (void)testReadBool {
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:bytes(0x00)];
+    XCTAssertEqual(NO, [input readBool]);
+  }
+  {
+    GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:bytes(0x01)];
+    XCTAssertEqual(YES, [input readBool]);
+  }
+}
+
 - (void)testReadVarint {
   [self assertReadVarint:bytes(0x00) value:0];
   [self assertReadVarint:bytes(0x01) value:1];
   [self assertReadVarint:bytes(0x7f) value:127];
   // 14882
   [self assertReadVarint:bytes(0xa2, 0x74) value:(0x22 << 0) | (0x74 << 7)];
+  // 1904930
+  [self assertReadVarint:bytes(0xa2, 0xa2, 0x74) value:(0x22 << 0) | (0x22 << 7) | (0x74 << 14)];
+  // 243831074
+  [self assertReadVarint:bytes(0xa2, 0xa2, 0xa2, 0x74)
+                   value:(0x22 << 0) | (0x22 << 7) | (0x22 << 14) | (0x74 << 21)];
   // 2961488830
   [self assertReadVarint:bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b)
                    value:(0x3e << 0) | (0x77 << 7) | (0x12 << 14) |
@@ -155,7 +220,7 @@
                              0xa6, 0x01)
                  value:(0x1b << 0) | (0x28 << 7) | (0x79 << 14) | (0x42 << 21) |
                        (0x3bLL << 28) | (0x56LL << 35) | (0x00LL << 42) |
-                       (0x05LL << 49) | (0x26LL << 56) | (0x01LL << 63)];
+                       (0x05LL << 49) | (0x26LL << 56) | (0x01ULL << 63)];
 
   // Failures
   [self assertReadVarintFailure:bytes(0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
@@ -163,6 +228,45 @@
   [self assertReadVarintFailure:bytes(0x80)];
 }
 
+- (void)testReadVarint32FromVarint64 {
+  {
+    // Turn on lower 31 bits of the upper half on a 64 bit varint.
+    NSData* data = bytes(0x80, 0x80, 0x80, 0x80, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0x7E);
+
+    int32_t value32 = 0x0;
+    GPBCodedInputStream* input32 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value32, [input32 readInt32]);
+
+    int64_t value64 = INT64_MAX & 0xFFFFFFFF00000000;
+    GPBCodedInputStream* input64 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value64, [input64 readInt64]);
+  }
+  {
+    // Turn on lower 31 bits and lower 31 bits on upper half on a 64 bit varint.
+    NSData* data = bytes(0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0x7E);
+
+    int32_t value32 = INT32_MAX;
+    GPBCodedInputStream* input32 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value32, [input32 readInt32]);
+
+    int64_t value64 = INT64_MAX & 0xFFFFFFFF7FFFFFFF;
+    GPBCodedInputStream* input64 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value64, [input64 readInt64]);
+  }
+  {
+    // Turn on bits 32 and 64 bit on a 64 bit varint.
+    NSData* data = bytes(0x80, 0x80, 0x80, 0x80, 0x88, 0x80, 0x80, 0x80, 0x80, 0x01);
+
+    int32_t value32 = INT32_MIN;
+    GPBCodedInputStream* input32 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value32, [input32 readInt32]);
+
+    int64_t value64 = INT64_MIN | (0x01LL << 31);
+    GPBCodedInputStream* input64 = [GPBCodedInputStream streamWithData:data];
+    XCTAssertEqual(value64, [input64 readInt64]);
+  }
+}
+
 - (void)testReadLittleEndian {
   [self assertReadLittleEndian32:bytes(0x78, 0x56, 0x34, 0x12)
                            value:0x12345678];
@@ -265,6 +369,27 @@
   XCTAssertThrows([input readBytes]);
 }
 
+- (void)testReadEmptyString {
+  NSData *data = bytes(0x00);
+  GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+  XCTAssertEqualObjects(@"", [input readString]);
+}
+
+- (void)testInvalidGroupEndTagThrows {
+  NSData *data = bytes(0x0B, 0x1A, 0x02, 0x4B, 0x50, 0x14);
+  GPBCodedInputStream* input = [GPBCodedInputStream streamWithData:data];
+  XCTAssertThrowsSpecificNamed([input skipMessage],
+                               NSException,
+                               GPBCodedInputStreamException,
+                               @"should throw a GPBCodedInputStreamException exception ");
+}
+
+- (void)testBytesWithNegativeSize {
+  NSData *data = bytes(0xFF, 0xFF, 0xFF, 0xFF, 0x0F);
+  GPBCodedInputStream *input = [GPBCodedInputStream streamWithData:data];
+  XCTAssertNil([input readBytes]);
+}
+
 // Verifies fix for b/10315336.
 // Note: Now that there isn't a custom string class under the hood, this test
 // isn't as critical, but it does cover bad input and if a custom class is added
diff --git a/objectivec/Tests/GPBCodedOuputStreamTests.m b/objectivec/Tests/GPBCodedOuputStreamTests.m
index 2ad326be..109239d5 100644
--- a/objectivec/Tests/GPBCodedOuputStreamTests.m
+++ b/objectivec/Tests/GPBCodedOuputStreamTests.m
@@ -266,7 +266,7 @@
                     value:(0x1b << 0) | (0x28 << 7) | (0x79 << 14) |
                           (0x42 << 21) | (0x3bLL << 28) | (0x56LL << 35) |
                           (0x00LL << 42) | (0x05LL << 49) | (0x26LL << 56) |
-                          (0x01LL << 63)];
+                          (0x01ULL << 63)];
 }
 
 - (void)testWriteLittleEndian {
@@ -423,4 +423,14 @@
   }
 }
 
+- (void)testThatItThrowsWhenWriteRawPtrFails {
+  NSOutputStream *output = [NSOutputStream outputStreamToMemory];
+  GPBCodedOutputStream *codedOutput =
+      [GPBCodedOutputStream streamWithOutputStream:output bufferSize:0];  // Skip buffering.
+  [output close];  // Close the output stream to force failure on write.
+  const char *cString = "raw";
+  XCTAssertThrowsSpecificNamed([codedOutput writeRawPtr:cString offset:0 length:strlen(cString)],
+                               NSException, GPBCodedOutputStreamException_WriteFailed);
+}
+
 @end
diff --git a/objectivec/Tests/GPBCompileTest01.m b/objectivec/Tests/GPBCompileTest01.m
new file mode 100644
index 00000000..c8bc433a
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest01.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBArray.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_1 = 0;
diff --git a/objectivec/Tests/GPBCompileTest02.m b/objectivec/Tests/GPBCompileTest02.m
new file mode 100644
index 00000000..c44e201a
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest02.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBCodedInputStream.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_2 = 0;
diff --git a/objectivec/Tests/GPBCompileTest03.m b/objectivec/Tests/GPBCompileTest03.m
new file mode 100644
index 00000000..41994f94
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest03.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBCodedOutputStream.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_3 = 0;
diff --git a/objectivec/Tests/GPBCompileTest04.m b/objectivec/Tests/GPBCompileTest04.m
new file mode 100644
index 00000000..c31498f1
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest04.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBDescriptor.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_4 = 0;
diff --git a/objectivec/Tests/GPBCompileTest05.m b/objectivec/Tests/GPBCompileTest05.m
new file mode 100644
index 00000000..adb72252
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest05.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBDictionary.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_5 = 0;
diff --git a/objectivec/Tests/GPBCompileTest06.m b/objectivec/Tests/GPBCompileTest06.m
new file mode 100644
index 00000000..b7505b02
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest06.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBExtensionRegistry.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_6 = 0;
diff --git a/objectivec/Tests/GPBCompileTest07.m b/objectivec/Tests/GPBCompileTest07.m
new file mode 100644
index 00000000..939bb709
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest07.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBMessage.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_7 = 0;
diff --git a/objectivec/Tests/GPBCompileTest08.m b/objectivec/Tests/GPBCompileTest08.m
new file mode 100644
index 00000000..a84f38cf
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest08.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBRootObject.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_8 = 0;
diff --git a/objectivec/Tests/GPBCompileTest09.m b/objectivec/Tests/GPBCompileTest09.m
new file mode 100644
index 00000000..f8ccb4a0
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest09.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBUnknownField.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_9 = 0;
diff --git a/objectivec/Tests/GPBCompileTest10.m b/objectivec/Tests/GPBCompileTest10.m
new file mode 100644
index 00000000..d8318678
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest10.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBUnknownFieldSet.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_10 = 0;
diff --git a/objectivec/Tests/GPBCompileTest11.m b/objectivec/Tests/GPBCompileTest11.m
new file mode 100644
index 00000000..9f2c6b11
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest11.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBUtilities.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_11 = 0;
diff --git a/objectivec/Tests/GPBCompileTest12.m b/objectivec/Tests/GPBCompileTest12.m
new file mode 100644
index 00000000..3aa29b31
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest12.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBWellKnownTypes.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_12 = 0;
diff --git a/objectivec/Tests/GPBCompileTest13.m b/objectivec/Tests/GPBCompileTest13.m
new file mode 100644
index 00000000..fef2af5f
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest13.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "GPBWireFormat.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_13 = 0;
diff --git a/objectivec/Tests/GPBCompileTest14.m b/objectivec/Tests/GPBCompileTest14.m
new file mode 100644
index 00000000..ae04349a
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest14.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Any.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_14 = 0;
diff --git a/objectivec/Tests/GPBCompileTest15.m b/objectivec/Tests/GPBCompileTest15.m
new file mode 100644
index 00000000..889243aa
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest15.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Api.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_15 = 0;
diff --git a/objectivec/Tests/GPBCompileTest16.m b/objectivec/Tests/GPBCompileTest16.m
new file mode 100644
index 00000000..c5aaf14f
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest16.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Duration.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_16 = 0;
diff --git a/objectivec/Tests/GPBCompileTest17.m b/objectivec/Tests/GPBCompileTest17.m
new file mode 100644
index 00000000..feb64d66
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest17.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Empty.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_17 = 0;
diff --git a/objectivec/Tests/GPBCompileTest18.m b/objectivec/Tests/GPBCompileTest18.m
new file mode 100644
index 00000000..66784c4f
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest18.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/FieldMask.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_18 = 0;
diff --git a/objectivec/Tests/GPBCompileTest19.m b/objectivec/Tests/GPBCompileTest19.m
new file mode 100644
index 00000000..435dea01
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest19.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/SourceContext.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_19 = 0;
diff --git a/objectivec/Tests/GPBCompileTest20.m b/objectivec/Tests/GPBCompileTest20.m
new file mode 100644
index 00000000..c2da8066
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest20.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Struct.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_20 = 0;
diff --git a/objectivec/Tests/GPBCompileTest21.m b/objectivec/Tests/GPBCompileTest21.m
new file mode 100644
index 00000000..d7110b93
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest21.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Timestamp.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_21 = 0;
diff --git a/objectivec/Tests/GPBCompileTest22.m b/objectivec/Tests/GPBCompileTest22.m
new file mode 100644
index 00000000..17380618
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest22.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Type.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_22 = 0;
diff --git a/objectivec/Tests/GPBCompileTest23.m b/objectivec/Tests/GPBCompileTest23.m
new file mode 100644
index 00000000..f22f9bdd
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest23.m
@@ -0,0 +1,40 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single public header to ensure things build.
+// It helps test that imports are complete/ordered correctly.
+
+#import "google/protobuf/Wrappers.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_23 = 0;
diff --git a/objectivec/Tests/GPBCompileTest24.m b/objectivec/Tests/GPBCompileTest24.m
new file mode 100644
index 00000000..c81ea732
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest24.m
@@ -0,0 +1,42 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single header to ensure things build. This
+// is NOT a public header of the library, but uses a file that defines
+// proto2 syntax messages that are extendable, so it can need more things
+// that the proto3 syntax WKTs bundled with the library.
+
+#import "google/protobuf/Descriptor.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_24 = 0;
diff --git a/objectivec/Tests/GPBCompileTest25.m b/objectivec/Tests/GPBCompileTest25.m
new file mode 100644
index 00000000..7a482b51
--- /dev/null
+++ b/objectivec/Tests/GPBCompileTest25.m
@@ -0,0 +1,42 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// This is a test including a single header to ensure things build. This
+// is NOT a public header of the library, but uses a file that defines
+// extensions to proto2 syntax messages, so it can need more things
+// that the proto3 syntax WKTs bundled with the library.
+
+#import "google/protobuf/UnittestCustomOptions.pbobjc.h"
+
+
+// Something in the body of this file so the compiler/linker won't complain
+// about an empty .o file.
+__attribute__((visibility("default"))) char dummy_symbol_25 = 0;
diff --git a/objectivec/Tests/GPBDescriptorTests.m b/objectivec/Tests/GPBDescriptorTests.m
index 1e1c3de8..d47cc30f 100644
--- a/objectivec/Tests/GPBDescriptorTests.m
+++ b/objectivec/Tests/GPBDescriptorTests.m
@@ -32,7 +32,7 @@
 
 #import <objc/runtime.h>
 
-#import "GPBDescriptor.h"
+#import "GPBDescriptor_PackagePrivate.h"
 #import "google/protobuf/Unittest.pbobjc.h"
 #import "google/protobuf/UnittestObjc.pbobjc.h"
 #import "google/protobuf/Descriptor.pbobjc.h"
@@ -83,6 +83,8 @@
   XCTAssertNotNil(fieldDescriptorWithNumber.enumDescriptor);
   XCTAssertEqualObjects(fieldDescriptorWithNumber.enumDescriptor.name,
                         @"TestAllTypes_NestedEnum");
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeEnum);
 
   // Foreign Enum
   fieldDescriptorWithName = [descriptor fieldWithName:@"optionalForeignEnum"];
@@ -93,6 +95,8 @@
   XCTAssertNotNil(fieldDescriptorWithNumber.enumDescriptor);
   XCTAssertEqualObjects(fieldDescriptorWithNumber.enumDescriptor.name,
                         @"ForeignEnum");
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeEnum);
 
   // Import Enum
   fieldDescriptorWithName = [descriptor fieldWithName:@"optionalImportEnum"];
@@ -103,6 +107,8 @@
   XCTAssertNotNil(fieldDescriptorWithNumber.enumDescriptor);
   XCTAssertEqualObjects(fieldDescriptorWithNumber.enumDescriptor.name,
                         @"ImportEnum");
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeEnum);
 
   // Nested Message
   fieldDescriptorWithName = [descriptor fieldWithName:@"optionalNestedMessage"];
@@ -111,6 +117,8 @@
   XCTAssertNotNil(fieldDescriptorWithNumber);
   XCTAssertEqual(fieldDescriptorWithName, fieldDescriptorWithNumber);
   XCTAssertNil(fieldDescriptorWithNumber.enumDescriptor);
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeMessage);
 
   // Foreign Message
   fieldDescriptorWithName =
@@ -120,6 +128,8 @@
   XCTAssertNotNil(fieldDescriptorWithNumber);
   XCTAssertEqual(fieldDescriptorWithName, fieldDescriptorWithNumber);
   XCTAssertNil(fieldDescriptorWithNumber.enumDescriptor);
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeMessage);
 
   // Import Message
   fieldDescriptorWithName = [descriptor fieldWithName:@"optionalImportMessage"];
@@ -128,6 +138,12 @@
   XCTAssertNotNil(fieldDescriptorWithNumber);
   XCTAssertEqual(fieldDescriptorWithName, fieldDescriptorWithNumber);
   XCTAssertNil(fieldDescriptorWithNumber.enumDescriptor);
+  XCTAssertEqual(fieldDescriptorWithName.number, fieldDescriptorWithNumber.number);
+  XCTAssertEqual(fieldDescriptorWithName.dataType, GPBDataTypeMessage);
+
+  // Some failed lookups.
+  XCTAssertNil([descriptor fieldWithName:@"NOT THERE"]);
+  XCTAssertNil([descriptor fieldWithNumber:9876543]);
 }
 
 - (void)testEnumDescriptor {
@@ -159,6 +175,7 @@
   XCTAssertNotNil(enumName);
   XCTAssertTrue([descriptor getValue:&value forEnumTextFormatName:@"FOO"]);
   XCTAssertEqual(value, TestAllTypes_NestedEnum_Foo);
+  XCTAssertNil([descriptor textFormatNameForValue:99999]);
 
   // Bad values
   enumName = [descriptor enumNameForValue:0];
@@ -173,6 +190,63 @@
   XCTAssertFalse([descriptor getValue:&value forEnumTextFormatName:@"Unknown"]);
 }
 
+- (void)testEnumDescriptorIntrospection {
+  GPBEnumDescriptor *descriptor = TestAllTypes_NestedEnum_EnumDescriptor();
+
+  XCTAssertEqual(descriptor.enumNameCount, 4U);
+  XCTAssertEqualObjects([descriptor getEnumNameForIndex:0],
+                        @"TestAllTypes_NestedEnum_Foo");
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:0], @"FOO");
+  XCTAssertEqualObjects([descriptor getEnumNameForIndex:1],
+                 @"TestAllTypes_NestedEnum_Bar");
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:1], @"BAR");
+  XCTAssertEqualObjects([descriptor getEnumNameForIndex:2],
+                 @"TestAllTypes_NestedEnum_Baz");
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:2], @"BAZ");
+  XCTAssertEqualObjects([descriptor getEnumNameForIndex:3],
+                 @"TestAllTypes_NestedEnum_Neg");
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:3], @"NEG");
+}
+
+- (void)testEnumDescriptorIntrospectionWithAlias {
+  GPBEnumDescriptor *descriptor = TestEnumWithDupValue_EnumDescriptor();
+  NSString *enumName;
+  int32_t value;
+
+  XCTAssertEqual(descriptor.enumNameCount, 5U);
+
+  enumName = [descriptor getEnumNameForIndex:0];
+  XCTAssertEqualObjects(enumName, @"TestEnumWithDupValue_Foo1");
+  XCTAssertTrue([descriptor getValue:&value forEnumName:enumName]);
+  XCTAssertEqual(value, 1);
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:0], @"FOO1");
+
+  enumName = [descriptor getEnumNameForIndex:1];
+  XCTAssertEqualObjects(enumName, @"TestEnumWithDupValue_Bar1");
+  XCTAssertTrue([descriptor getValue:&value forEnumName:enumName]);
+  XCTAssertEqual(value, 2);
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:1], @"BAR1");
+
+  enumName = [descriptor getEnumNameForIndex:2];
+  XCTAssertEqualObjects(enumName, @"TestEnumWithDupValue_Baz");
+  XCTAssertTrue([descriptor getValue:&value forEnumName:enumName]);
+  XCTAssertEqual(value, 3);
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:2], @"BAZ");
+
+  enumName = [descriptor getEnumNameForIndex:3];
+  XCTAssertEqualObjects(enumName, @"TestEnumWithDupValue_Foo2");
+  XCTAssertTrue([descriptor getValue:&value forEnumName:enumName]);
+  XCTAssertEqual(value, 1);
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:3], @"FOO2");
+
+  enumName = [descriptor getEnumNameForIndex:4];
+  XCTAssertEqualObjects(enumName, @"TestEnumWithDupValue_Bar2");
+  XCTAssertTrue([descriptor getValue:&value forEnumName:enumName]);
+  XCTAssertEqual(value, 2);
+  XCTAssertEqualObjects([descriptor getEnumTextFormatNameForIndex:4], @"BAR2");
+
+}
+
 - (void)testEnumValueValidator {
   GPBDescriptor *descriptor = [TestAllTypes descriptor];
   GPBFieldDescriptor *fieldDescriptor =
@@ -253,4 +327,102 @@
   XCTAssertNil(bazString.containingOneof);
 }
 
+- (void)testExtensiondDescriptor {
+  Class msgClass = [TestAllExtensions class];
+  Class packedMsgClass = [TestPackedExtensions class];
+
+  // Int
+
+  GPBExtensionDescriptor *descriptor = [UnittestRoot optionalInt32Extension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertEqualObjects(descriptor.defaultValue, @0);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  descriptor = [UnittestRoot defaultInt32Extension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertEqualObjects(descriptor.defaultValue, @41);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  // Enum
+
+  descriptor = [UnittestRoot optionalNestedEnumExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertEqual(descriptor.defaultValue, @1);
+  XCTAssertEqualObjects(descriptor.enumDescriptor.name, @"TestAllTypes_NestedEnum");
+
+  descriptor = [UnittestRoot defaultNestedEnumExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertEqual(descriptor.defaultValue, @2);
+  XCTAssertEqualObjects(descriptor.enumDescriptor.name, @"TestAllTypes_NestedEnum");
+
+  // Message
+
+  descriptor = [UnittestRoot optionalNestedMessageExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  // Repeated Int
+
+  descriptor = [UnittestRoot repeatedInt32Extension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  descriptor = [UnittestRoot packedInt32Extension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, packedMsgClass);  // ptr equality
+  XCTAssertTrue(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  // Repeated Enum
+
+  descriptor = [UnittestRoot repeatedNestedEnumExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertEqualObjects(descriptor.enumDescriptor.name, @"TestAllTypes_NestedEnum");
+
+  descriptor = [UnittestRoot packedEnumExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, packedMsgClass);  // ptr equality
+  XCTAssertTrue(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertEqualObjects(descriptor.enumDescriptor.name, @"ForeignEnum");
+
+  // Repeated Message
+
+  descriptor = [UnittestRoot repeatedNestedMessageExtension];
+  XCTAssertNotNil(descriptor);
+  XCTAssertEqual(descriptor.containingMessageClass, msgClass);  // ptr equality
+  XCTAssertFalse(descriptor.isPackable);
+  XCTAssertNil(descriptor.defaultValue);
+  XCTAssertNil(descriptor.enumDescriptor);
+
+  // Compare (used internally for serialization).
+
+  GPBExtensionDescriptor *ext1 = [UnittestRoot optionalInt32Extension];
+  XCTAssertEqual(ext1.fieldNumber, 1u);
+  GPBExtensionDescriptor *ext2 = [UnittestRoot optionalInt64Extension];
+  XCTAssertEqual(ext2.fieldNumber, 2u);
+
+  XCTAssertEqual([ext1 compareByFieldNumber:ext2], NSOrderedAscending);
+  XCTAssertEqual([ext2 compareByFieldNumber:ext1], NSOrderedDescending);
+  XCTAssertEqual([ext1 compareByFieldNumber:ext1], NSOrderedSame);
+}
+
 @end
diff --git a/objectivec/Tests/GPBDictionaryTests+Bool.m b/objectivec/Tests/GPBDictionaryTests+Bool.m
index 0dbe07b6..0af0c815 100644
--- a/objectivec/Tests/GPBDictionaryTests+Bool.m
+++ b/objectivec/Tests/GPBDictionaryTests+Bool.m
@@ -63,7 +63,8 @@
 }
 
 - (void)testOne {
-  GPBBoolUInt32Dictionary *dict = [GPBBoolUInt32Dictionary dictionaryWithUInt32:100U forKey:YES];
+  GPBBoolUInt32Dictionary *dict = [[GPBBoolUInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -76,6 +77,7 @@
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -214,17 +216,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolUInt32Dictionary *dict2 =
-      [GPBBoolUInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBBoolUInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolUInt32Dictionary *dict = [GPBBoolUInt32Dictionary dictionary];
+  GPBBoolUInt32Dictionary *dict = [[GPBBoolUInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -249,6 +252,7 @@
   XCTAssertTrue([dict getUInt32:&value forKey:NO]);
   XCTAssertEqual(value, 101U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -364,7 +368,8 @@
 }
 
 - (void)testOne {
-  GPBBoolInt32Dictionary *dict = [GPBBoolInt32Dictionary dictionaryWithInt32:200 forKey:YES];
+  GPBBoolInt32Dictionary *dict = [[GPBBoolInt32Dictionary alloc] init];
+  [dict setInt32:200 forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -377,6 +382,7 @@
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -515,17 +521,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolInt32Dictionary *dict2 =
-      [GPBBoolInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBBoolInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolInt32Dictionary *dict = [GPBBoolInt32Dictionary dictionary];
+  GPBBoolInt32Dictionary *dict = [[GPBBoolInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -550,6 +557,7 @@
   XCTAssertTrue([dict getInt32:&value forKey:NO]);
   XCTAssertEqual(value, 201);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -665,7 +673,8 @@
 }
 
 - (void)testOne {
-  GPBBoolUInt64Dictionary *dict = [GPBBoolUInt64Dictionary dictionaryWithUInt64:300U forKey:YES];
+  GPBBoolUInt64Dictionary *dict = [[GPBBoolUInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -678,6 +687,7 @@
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -816,17 +826,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolUInt64Dictionary *dict2 =
-      [GPBBoolUInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBBoolUInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolUInt64Dictionary *dict = [GPBBoolUInt64Dictionary dictionary];
+  GPBBoolUInt64Dictionary *dict = [[GPBBoolUInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -851,6 +862,7 @@
   XCTAssertTrue([dict getUInt64:&value forKey:NO]);
   XCTAssertEqual(value, 301U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -966,7 +978,8 @@
 }
 
 - (void)testOne {
-  GPBBoolInt64Dictionary *dict = [GPBBoolInt64Dictionary dictionaryWithInt64:400 forKey:YES];
+  GPBBoolInt64Dictionary *dict = [[GPBBoolInt64Dictionary alloc] init];
+  [dict setInt64:400 forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -979,6 +992,7 @@
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1117,17 +1131,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolInt64Dictionary *dict2 =
-      [GPBBoolInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBBoolInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolInt64Dictionary *dict = [GPBBoolInt64Dictionary dictionary];
+  GPBBoolInt64Dictionary *dict = [[GPBBoolInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1152,6 +1167,7 @@
   XCTAssertTrue([dict getInt64:&value forKey:NO]);
   XCTAssertEqual(value, 401);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1267,7 +1283,8 @@
 }
 
 - (void)testOne {
-  GPBBoolBoolDictionary *dict = [GPBBoolBoolDictionary dictionaryWithBool:NO forKey:YES];
+  GPBBoolBoolDictionary *dict = [[GPBBoolBoolDictionary alloc] init];
+  [dict setBool:NO forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1280,6 +1297,7 @@
     XCTAssertEqual(aValue, NO);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1418,17 +1436,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolBoolDictionary *dict2 =
-      [GPBBoolBoolDictionary dictionaryWithDictionary:dict];
+      [[GPBBoolBoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolBoolDictionary *dict = [GPBBoolBoolDictionary dictionary];
+  GPBBoolBoolDictionary *dict = [[GPBBoolBoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1453,6 +1472,7 @@
   XCTAssertTrue([dict getBool:&value forKey:NO]);
   XCTAssertEqual(value, YES);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1568,7 +1588,8 @@
 }
 
 - (void)testOne {
-  GPBBoolFloatDictionary *dict = [GPBBoolFloatDictionary dictionaryWithFloat:500.f forKey:YES];
+  GPBBoolFloatDictionary *dict = [[GPBBoolFloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1581,6 +1602,7 @@
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1719,17 +1741,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolFloatDictionary *dict2 =
-      [GPBBoolFloatDictionary dictionaryWithDictionary:dict];
+      [[GPBBoolFloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolFloatDictionary *dict = [GPBBoolFloatDictionary dictionary];
+  GPBBoolFloatDictionary *dict = [[GPBBoolFloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1754,6 +1777,7 @@
   XCTAssertTrue([dict getFloat:&value forKey:NO]);
   XCTAssertEqual(value, 501.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1869,7 +1893,8 @@
 }
 
 - (void)testOne {
-  GPBBoolDoubleDictionary *dict = [GPBBoolDoubleDictionary dictionaryWithDouble:600. forKey:YES];
+  GPBBoolDoubleDictionary *dict = [[GPBBoolDoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -1882,6 +1907,7 @@
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2020,17 +2046,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolDoubleDictionary *dict2 =
-      [GPBBoolDoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBBoolDoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolDoubleDictionary *dict = [GPBBoolDoubleDictionary dictionary];
+  GPBBoolDoubleDictionary *dict = [[GPBBoolDoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2055,6 +2082,7 @@
   XCTAssertTrue([dict getDouble:&value forKey:NO]);
   XCTAssertEqual(value, 601.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2170,7 +2198,8 @@
 }
 
 - (void)testOne {
-  GPBBoolObjectDictionary<NSString*> *dict = [GPBBoolObjectDictionary dictionaryWithObject:@"abc" forKey:YES];
+  GPBBoolObjectDictionary<NSString*> *dict = [[GPBBoolObjectDictionary alloc] init];
+  [dict setObject:@"abc" forKey:YES];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   XCTAssertEqualObjects([dict objectForKey:YES], @"abc");
@@ -2180,6 +2209,7 @@
     XCTAssertEqualObjects(aObject, @"abc");
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2313,17 +2343,18 @@
   XCTAssertNotNil(dict);
 
   GPBBoolObjectDictionary<NSString*> *dict2 =
-      [GPBBoolObjectDictionary dictionaryWithDictionary:dict];
+      [[GPBBoolObjectDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBBoolObjectDictionary<NSString*> *dict = [GPBBoolObjectDictionary dictionary];
+  GPBBoolObjectDictionary<NSString*> *dict = [[GPBBoolObjectDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2343,6 +2374,7 @@
   XCTAssertEqualObjects([dict objectForKey:YES], @"abc");
   XCTAssertEqualObjects([dict objectForKey:NO], @"def");
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests+Int32.m b/objectivec/Tests/GPBDictionaryTests+Int32.m
index c539bdc2..4ba30203 100644
--- a/objectivec/Tests/GPBDictionaryTests+Int32.m
+++ b/objectivec/Tests/GPBDictionaryTests+Int32.m
@@ -45,7 +45,6 @@
 
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBInt32EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(int32_t)key;
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const int32_t [])keys
                         count:(NSUInteger)count;
@@ -64,14 +63,6 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 @implementation GPBInt32EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(int32_t)key {
-  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-  // type correct.
-  return [[(GPBInt32EnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-                                                                  rawValues:&value
-                                                                    forKeys:&key
-                                                                      count:1] autorelease];
-}
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const int32_t [])keys
                         count:(NSUInteger)count {
@@ -103,7 +94,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32UInt32Dictionary *dict = [GPBInt32UInt32Dictionary dictionaryWithUInt32:100U forKey:11];
+  GPBInt32UInt32Dictionary *dict = [[GPBInt32UInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -116,6 +108,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -258,17 +251,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32UInt32Dictionary *dict2 =
-      [GPBInt32UInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt32UInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32UInt32Dictionary *dict = [GPBInt32UInt32Dictionary dictionary];
+  GPBInt32UInt32Dictionary *dict = [[GPBInt32UInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -299,6 +293,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt32:&value forKey:14]);
   XCTAssertEqual(value, 103U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -460,7 +455,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32Int32Dictionary *dict = [GPBInt32Int32Dictionary dictionaryWithInt32:200 forKey:11];
+  GPBInt32Int32Dictionary *dict = [[GPBInt32Int32Dictionary alloc] init];
+  [dict setInt32:200 forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -473,6 +469,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -615,17 +612,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32Int32Dictionary *dict2 =
-      [GPBInt32Int32Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt32Int32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32Int32Dictionary *dict = [GPBInt32Int32Dictionary dictionary];
+  GPBInt32Int32Dictionary *dict = [[GPBInt32Int32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -656,6 +654,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt32:&value forKey:14]);
   XCTAssertEqual(value, 203);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -817,7 +816,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32UInt64Dictionary *dict = [GPBInt32UInt64Dictionary dictionaryWithUInt64:300U forKey:11];
+  GPBInt32UInt64Dictionary *dict = [[GPBInt32UInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -830,6 +830,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -972,17 +973,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32UInt64Dictionary *dict2 =
-      [GPBInt32UInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt32UInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32UInt64Dictionary *dict = [GPBInt32UInt64Dictionary dictionary];
+  GPBInt32UInt64Dictionary *dict = [[GPBInt32UInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1013,6 +1015,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt64:&value forKey:14]);
   XCTAssertEqual(value, 303U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1174,7 +1177,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32Int64Dictionary *dict = [GPBInt32Int64Dictionary dictionaryWithInt64:400 forKey:11];
+  GPBInt32Int64Dictionary *dict = [[GPBInt32Int64Dictionary alloc] init];
+  [dict setInt64:400 forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -1187,6 +1191,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1329,17 +1334,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32Int64Dictionary *dict2 =
-      [GPBInt32Int64Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt32Int64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32Int64Dictionary *dict = [GPBInt32Int64Dictionary dictionary];
+  GPBInt32Int64Dictionary *dict = [[GPBInt32Int64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1370,6 +1376,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt64:&value forKey:14]);
   XCTAssertEqual(value, 403);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1531,7 +1538,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32BoolDictionary *dict = [GPBInt32BoolDictionary dictionaryWithBool:YES forKey:11];
+  GPBInt32BoolDictionary *dict = [[GPBInt32BoolDictionary alloc] init];
+  [dict setBool:YES forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1544,6 +1552,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, YES);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1686,17 +1695,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32BoolDictionary *dict2 =
-      [GPBInt32BoolDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32BoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32BoolDictionary *dict = [GPBInt32BoolDictionary dictionary];
+  GPBInt32BoolDictionary *dict = [[GPBInt32BoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1727,6 +1737,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getBool:&value forKey:14]);
   XCTAssertEqual(value, NO);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1888,7 +1899,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32FloatDictionary *dict = [GPBInt32FloatDictionary dictionaryWithFloat:500.f forKey:11];
+  GPBInt32FloatDictionary *dict = [[GPBInt32FloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1901,6 +1913,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2043,17 +2056,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32FloatDictionary *dict2 =
-      [GPBInt32FloatDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32FloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32FloatDictionary *dict = [GPBInt32FloatDictionary dictionary];
+  GPBInt32FloatDictionary *dict = [[GPBInt32FloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2084,6 +2098,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getFloat:&value forKey:14]);
   XCTAssertEqual(value, 503.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2245,7 +2260,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32DoubleDictionary *dict = [GPBInt32DoubleDictionary dictionaryWithDouble:600. forKey:11];
+  GPBInt32DoubleDictionary *dict = [[GPBInt32DoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -2258,6 +2274,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2400,17 +2417,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32DoubleDictionary *dict2 =
-      [GPBInt32DoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32DoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32DoubleDictionary *dict = [GPBInt32DoubleDictionary dictionary];
+  GPBInt32DoubleDictionary *dict = [[GPBInt32DoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2441,6 +2459,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getDouble:&value forKey:14]);
   XCTAssertEqual(value, 603.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2602,7 +2621,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32EnumDictionary *dict = [GPBInt32EnumDictionary dictionaryWithEnum:700 forKey:11];
+  GPBInt32EnumDictionary *dict = [[GPBInt32EnumDictionary alloc] init];
+  [dict setEnum:700 forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -2615,6 +2635,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 700);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2757,17 +2778,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32EnumDictionary *dict2 =
-      [GPBInt32EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32EnumDictionary *dict = [GPBInt32EnumDictionary dictionary];
+  GPBInt32EnumDictionary *dict = [[GPBInt32EnumDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2798,6 +2820,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getEnum:&value forKey:14]);
   XCTAssertEqual(value, 703);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -3120,19 +3143,20 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32EnumDictionary *dict2 =
-      [GPBInt32EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
   XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+  [dict2 release];
   [dict release];
 }
 
 - (void)testUnknownAdds {
   GPBInt32EnumDictionary *dict =
-    [GPBInt32EnumDictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+      [[GPBInt32EnumDictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3172,6 +3196,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getRawValue:&value forKey:14]);
   XCTAssertEqual(value, 803);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testUnknownRemove {
@@ -3375,7 +3400,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt32ObjectDictionary<NSString*> *dict = [GPBInt32ObjectDictionary dictionaryWithObject:@"abc" forKey:11];
+  GPBInt32ObjectDictionary<NSString*> *dict = [[GPBInt32ObjectDictionary alloc] init];
+  [dict setObject:@"abc" forKey:11];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   XCTAssertEqualObjects([dict objectForKey:11], @"abc");
@@ -3385,6 +3411,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqualObjects(aObject, @"abc");
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -3520,17 +3547,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt32ObjectDictionary<NSString*> *dict2 =
-      [GPBInt32ObjectDictionary dictionaryWithDictionary:dict];
+      [[GPBInt32ObjectDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt32ObjectDictionary<NSString*> *dict = [GPBInt32ObjectDictionary dictionary];
+  GPBInt32ObjectDictionary<NSString*> *dict = [[GPBInt32ObjectDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3552,6 +3580,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertEqualObjects([dict objectForKey:13], @"ghi");
   XCTAssertEqualObjects([dict objectForKey:14], @"jkl");
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests+Int64.m b/objectivec/Tests/GPBDictionaryTests+Int64.m
index b90cdf8c..966024b7 100644
--- a/objectivec/Tests/GPBDictionaryTests+Int64.m
+++ b/objectivec/Tests/GPBDictionaryTests+Int64.m
@@ -45,7 +45,6 @@
 
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBInt64EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(int64_t)key;
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const int64_t [])keys
                         count:(NSUInteger)count;
@@ -64,14 +63,6 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 @implementation GPBInt64EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(int64_t)key {
-  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-  // type correct.
-  return [[(GPBInt64EnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-                                                                  rawValues:&value
-                                                                    forKeys:&key
-                                                                      count:1] autorelease];
-}
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const int64_t [])keys
                         count:(NSUInteger)count {
@@ -103,7 +94,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64UInt32Dictionary *dict = [GPBInt64UInt32Dictionary dictionaryWithUInt32:100U forKey:21LL];
+  GPBInt64UInt32Dictionary *dict = [[GPBInt64UInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -116,6 +108,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -258,17 +251,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64UInt32Dictionary *dict2 =
-      [GPBInt64UInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt64UInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64UInt32Dictionary *dict = [GPBInt64UInt32Dictionary dictionary];
+  GPBInt64UInt32Dictionary *dict = [[GPBInt64UInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -299,6 +293,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt32:&value forKey:24LL]);
   XCTAssertEqual(value, 103U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -460,7 +455,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64Int32Dictionary *dict = [GPBInt64Int32Dictionary dictionaryWithInt32:200 forKey:21LL];
+  GPBInt64Int32Dictionary *dict = [[GPBInt64Int32Dictionary alloc] init];
+  [dict setInt32:200 forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -473,6 +469,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -615,17 +612,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64Int32Dictionary *dict2 =
-      [GPBInt64Int32Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt64Int32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64Int32Dictionary *dict = [GPBInt64Int32Dictionary dictionary];
+  GPBInt64Int32Dictionary *dict = [[GPBInt64Int32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -656,6 +654,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt32:&value forKey:24LL]);
   XCTAssertEqual(value, 203);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -817,7 +816,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64UInt64Dictionary *dict = [GPBInt64UInt64Dictionary dictionaryWithUInt64:300U forKey:21LL];
+  GPBInt64UInt64Dictionary *dict = [[GPBInt64UInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -830,6 +830,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -972,17 +973,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64UInt64Dictionary *dict2 =
-      [GPBInt64UInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt64UInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64UInt64Dictionary *dict = [GPBInt64UInt64Dictionary dictionary];
+  GPBInt64UInt64Dictionary *dict = [[GPBInt64UInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1013,6 +1015,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt64:&value forKey:24LL]);
   XCTAssertEqual(value, 303U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1174,7 +1177,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64Int64Dictionary *dict = [GPBInt64Int64Dictionary dictionaryWithInt64:400 forKey:21LL];
+  GPBInt64Int64Dictionary *dict = [[GPBInt64Int64Dictionary alloc] init];
+  [dict setInt64:400 forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -1187,6 +1191,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1329,17 +1334,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64Int64Dictionary *dict2 =
-      [GPBInt64Int64Dictionary dictionaryWithDictionary:dict];
+      [[GPBInt64Int64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64Int64Dictionary *dict = [GPBInt64Int64Dictionary dictionary];
+  GPBInt64Int64Dictionary *dict = [[GPBInt64Int64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1370,6 +1376,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt64:&value forKey:24LL]);
   XCTAssertEqual(value, 403);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1531,7 +1538,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64BoolDictionary *dict = [GPBInt64BoolDictionary dictionaryWithBool:YES forKey:21LL];
+  GPBInt64BoolDictionary *dict = [[GPBInt64BoolDictionary alloc] init];
+  [dict setBool:YES forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1544,6 +1552,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, YES);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1686,17 +1695,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64BoolDictionary *dict2 =
-      [GPBInt64BoolDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64BoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64BoolDictionary *dict = [GPBInt64BoolDictionary dictionary];
+  GPBInt64BoolDictionary *dict = [[GPBInt64BoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1727,6 +1737,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getBool:&value forKey:24LL]);
   XCTAssertEqual(value, NO);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1888,7 +1899,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64FloatDictionary *dict = [GPBInt64FloatDictionary dictionaryWithFloat:500.f forKey:21LL];
+  GPBInt64FloatDictionary *dict = [[GPBInt64FloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1901,6 +1913,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2043,17 +2056,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64FloatDictionary *dict2 =
-      [GPBInt64FloatDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64FloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64FloatDictionary *dict = [GPBInt64FloatDictionary dictionary];
+  GPBInt64FloatDictionary *dict = [[GPBInt64FloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2084,6 +2098,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getFloat:&value forKey:24LL]);
   XCTAssertEqual(value, 503.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2245,7 +2260,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64DoubleDictionary *dict = [GPBInt64DoubleDictionary dictionaryWithDouble:600. forKey:21LL];
+  GPBInt64DoubleDictionary *dict = [[GPBInt64DoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -2258,6 +2274,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2400,17 +2417,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64DoubleDictionary *dict2 =
-      [GPBInt64DoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64DoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64DoubleDictionary *dict = [GPBInt64DoubleDictionary dictionary];
+  GPBInt64DoubleDictionary *dict = [[GPBInt64DoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2441,6 +2459,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getDouble:&value forKey:24LL]);
   XCTAssertEqual(value, 603.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2602,7 +2621,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64EnumDictionary *dict = [GPBInt64EnumDictionary dictionaryWithEnum:700 forKey:21LL];
+  GPBInt64EnumDictionary *dict = [[GPBInt64EnumDictionary alloc] init];
+  [dict setEnum:700 forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -2615,6 +2635,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 700);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2757,17 +2778,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64EnumDictionary *dict2 =
-      [GPBInt64EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64EnumDictionary *dict = [GPBInt64EnumDictionary dictionary];
+  GPBInt64EnumDictionary *dict = [[GPBInt64EnumDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2798,6 +2820,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getEnum:&value forKey:24LL]);
   XCTAssertEqual(value, 703);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -3120,19 +3143,20 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64EnumDictionary *dict2 =
-      [GPBInt64EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
   XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+  [dict2 release];
   [dict release];
 }
 
 - (void)testUnknownAdds {
   GPBInt64EnumDictionary *dict =
-    [GPBInt64EnumDictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+      [[GPBInt64EnumDictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3172,6 +3196,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getRawValue:&value forKey:24LL]);
   XCTAssertEqual(value, 803);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testUnknownRemove {
@@ -3375,7 +3400,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBInt64ObjectDictionary<NSString*> *dict = [GPBInt64ObjectDictionary dictionaryWithObject:@"abc" forKey:21LL];
+  GPBInt64ObjectDictionary<NSString*> *dict = [[GPBInt64ObjectDictionary alloc] init];
+  [dict setObject:@"abc" forKey:21LL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   XCTAssertEqualObjects([dict objectForKey:21LL], @"abc");
@@ -3385,6 +3411,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqualObjects(aObject, @"abc");
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -3520,17 +3547,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBInt64ObjectDictionary<NSString*> *dict2 =
-      [GPBInt64ObjectDictionary dictionaryWithDictionary:dict];
+      [[GPBInt64ObjectDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBInt64ObjectDictionary<NSString*> *dict = [GPBInt64ObjectDictionary dictionary];
+  GPBInt64ObjectDictionary<NSString*> *dict = [[GPBInt64ObjectDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3552,6 +3580,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertEqualObjects([dict objectForKey:23LL], @"ghi");
   XCTAssertEqualObjects([dict objectForKey:24LL], @"jkl");
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests+String.m b/objectivec/Tests/GPBDictionaryTests+String.m
index 5df1d51d..82d7952b 100644
--- a/objectivec/Tests/GPBDictionaryTests+String.m
+++ b/objectivec/Tests/GPBDictionaryTests+String.m
@@ -45,7 +45,6 @@
 
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBStringEnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(NSString *)key;
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const NSString * [])keys
                         count:(NSUInteger)count;
@@ -64,14 +63,6 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 @implementation GPBStringEnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(NSString *)key {
-  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-  // type correct.
-  return [[(GPBStringEnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-                                                                   rawValues:&value
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const NSString * [])keys
                         count:(NSUInteger)count {
@@ -103,7 +94,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringUInt32Dictionary *dict = [GPBStringUInt32Dictionary dictionaryWithUInt32:100U forKey:@"foo"];
+  GPBStringUInt32Dictionary *dict = [[GPBStringUInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -116,6 +108,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -258,17 +251,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringUInt32Dictionary *dict2 =
-      [GPBStringUInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBStringUInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringUInt32Dictionary *dict = [GPBStringUInt32Dictionary dictionary];
+  GPBStringUInt32Dictionary *dict = [[GPBStringUInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -299,6 +293,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt32:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 103U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -460,7 +455,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringInt32Dictionary *dict = [GPBStringInt32Dictionary dictionaryWithInt32:200 forKey:@"foo"];
+  GPBStringInt32Dictionary *dict = [[GPBStringInt32Dictionary alloc] init];
+  [dict setInt32:200 forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -473,6 +469,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -615,17 +612,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringInt32Dictionary *dict2 =
-      [GPBStringInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBStringInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringInt32Dictionary *dict = [GPBStringInt32Dictionary dictionary];
+  GPBStringInt32Dictionary *dict = [[GPBStringInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -656,6 +654,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt32:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 203);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -817,7 +816,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringUInt64Dictionary *dict = [GPBStringUInt64Dictionary dictionaryWithUInt64:300U forKey:@"foo"];
+  GPBStringUInt64Dictionary *dict = [[GPBStringUInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -830,6 +830,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -972,17 +973,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringUInt64Dictionary *dict2 =
-      [GPBStringUInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBStringUInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringUInt64Dictionary *dict = [GPBStringUInt64Dictionary dictionary];
+  GPBStringUInt64Dictionary *dict = [[GPBStringUInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1013,6 +1015,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt64:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 303U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1174,7 +1177,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringInt64Dictionary *dict = [GPBStringInt64Dictionary dictionaryWithInt64:400 forKey:@"foo"];
+  GPBStringInt64Dictionary *dict = [[GPBStringInt64Dictionary alloc] init];
+  [dict setInt64:400 forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -1187,6 +1191,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1329,17 +1334,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringInt64Dictionary *dict2 =
-      [GPBStringInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBStringInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringInt64Dictionary *dict = [GPBStringInt64Dictionary dictionary];
+  GPBStringInt64Dictionary *dict = [[GPBStringInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1370,6 +1376,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt64:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 403);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1531,7 +1538,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringBoolDictionary *dict = [GPBStringBoolDictionary dictionaryWithBool:YES forKey:@"foo"];
+  GPBStringBoolDictionary *dict = [[GPBStringBoolDictionary alloc] init];
+  [dict setBool:YES forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1544,6 +1552,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, YES);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1686,17 +1695,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringBoolDictionary *dict2 =
-      [GPBStringBoolDictionary dictionaryWithDictionary:dict];
+      [[GPBStringBoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringBoolDictionary *dict = [GPBStringBoolDictionary dictionary];
+  GPBStringBoolDictionary *dict = [[GPBStringBoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1727,6 +1737,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getBool:&value forKey:@"mumble"]);
   XCTAssertEqual(value, NO);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1888,7 +1899,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringFloatDictionary *dict = [GPBStringFloatDictionary dictionaryWithFloat:500.f forKey:@"foo"];
+  GPBStringFloatDictionary *dict = [[GPBStringFloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1901,6 +1913,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2043,17 +2056,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringFloatDictionary *dict2 =
-      [GPBStringFloatDictionary dictionaryWithDictionary:dict];
+      [[GPBStringFloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringFloatDictionary *dict = [GPBStringFloatDictionary dictionary];
+  GPBStringFloatDictionary *dict = [[GPBStringFloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2084,6 +2098,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getFloat:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 503.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2245,7 +2260,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringDoubleDictionary *dict = [GPBStringDoubleDictionary dictionaryWithDouble:600. forKey:@"foo"];
+  GPBStringDoubleDictionary *dict = [[GPBStringDoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -2258,6 +2274,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2400,17 +2417,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringDoubleDictionary *dict2 =
-      [GPBStringDoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBStringDoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringDoubleDictionary *dict = [GPBStringDoubleDictionary dictionary];
+  GPBStringDoubleDictionary *dict = [[GPBStringDoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2441,6 +2459,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getDouble:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 603.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2602,7 +2621,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBStringEnumDictionary *dict = [GPBStringEnumDictionary dictionaryWithEnum:700 forKey:@"foo"];
+  GPBStringEnumDictionary *dict = [[GPBStringEnumDictionary alloc] init];
+  [dict setEnum:700 forKey:@"foo"];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -2615,6 +2635,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 700);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2757,17 +2778,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringEnumDictionary *dict2 =
-      [GPBStringEnumDictionary dictionaryWithDictionary:dict];
+      [[GPBStringEnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBStringEnumDictionary *dict = [GPBStringEnumDictionary dictionary];
+  GPBStringEnumDictionary *dict = [[GPBStringEnumDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2798,6 +2820,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getEnum:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 703);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -3120,19 +3143,20 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBStringEnumDictionary *dict2 =
-      [GPBStringEnumDictionary dictionaryWithDictionary:dict];
+      [[GPBStringEnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
   XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+  [dict2 release];
   [dict release];
 }
 
 - (void)testUnknownAdds {
   GPBStringEnumDictionary *dict =
-    [GPBStringEnumDictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+      [[GPBStringEnumDictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3172,6 +3196,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getRawValue:&value forKey:@"mumble"]);
   XCTAssertEqual(value, 803);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testUnknownRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests+UInt32.m b/objectivec/Tests/GPBDictionaryTests+UInt32.m
index 1d3f6f78..5314c58a 100644
--- a/objectivec/Tests/GPBDictionaryTests+UInt32.m
+++ b/objectivec/Tests/GPBDictionaryTests+UInt32.m
@@ -45,7 +45,6 @@
 
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBUInt32EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(uint32_t)key;
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const uint32_t [])keys
                         count:(NSUInteger)count;
@@ -64,14 +63,6 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 @implementation GPBUInt32EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(uint32_t)key {
-  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-  // type correct.
-  return [[(GPBUInt32EnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-                                                                   rawValues:&value
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const uint32_t [])keys
                         count:(NSUInteger)count {
@@ -103,7 +94,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32UInt32Dictionary *dict = [GPBUInt32UInt32Dictionary dictionaryWithUInt32:100U forKey:1U];
+  GPBUInt32UInt32Dictionary *dict = [[GPBUInt32UInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -116,6 +108,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -258,17 +251,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32UInt32Dictionary *dict2 =
-      [GPBUInt32UInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32UInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32UInt32Dictionary *dict = [GPBUInt32UInt32Dictionary dictionary];
+  GPBUInt32UInt32Dictionary *dict = [[GPBUInt32UInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -299,6 +293,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt32:&value forKey:4U]);
   XCTAssertEqual(value, 103U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -460,7 +455,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32Int32Dictionary *dict = [GPBUInt32Int32Dictionary dictionaryWithInt32:200 forKey:1U];
+  GPBUInt32Int32Dictionary *dict = [[GPBUInt32Int32Dictionary alloc] init];
+  [dict setInt32:200 forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -473,6 +469,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -615,17 +612,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32Int32Dictionary *dict2 =
-      [GPBUInt32Int32Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32Int32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32Int32Dictionary *dict = [GPBUInt32Int32Dictionary dictionary];
+  GPBUInt32Int32Dictionary *dict = [[GPBUInt32Int32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -656,6 +654,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt32:&value forKey:4U]);
   XCTAssertEqual(value, 203);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -817,7 +816,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32UInt64Dictionary *dict = [GPBUInt32UInt64Dictionary dictionaryWithUInt64:300U forKey:1U];
+  GPBUInt32UInt64Dictionary *dict = [[GPBUInt32UInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -830,6 +830,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -972,17 +973,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32UInt64Dictionary *dict2 =
-      [GPBUInt32UInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32UInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32UInt64Dictionary *dict = [GPBUInt32UInt64Dictionary dictionary];
+  GPBUInt32UInt64Dictionary *dict = [[GPBUInt32UInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1013,6 +1015,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt64:&value forKey:4U]);
   XCTAssertEqual(value, 303U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1174,7 +1177,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32Int64Dictionary *dict = [GPBUInt32Int64Dictionary dictionaryWithInt64:400 forKey:1U];
+  GPBUInt32Int64Dictionary *dict = [[GPBUInt32Int64Dictionary alloc] init];
+  [dict setInt64:400 forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -1187,6 +1191,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1329,17 +1334,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32Int64Dictionary *dict2 =
-      [GPBUInt32Int64Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32Int64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32Int64Dictionary *dict = [GPBUInt32Int64Dictionary dictionary];
+  GPBUInt32Int64Dictionary *dict = [[GPBUInt32Int64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1370,6 +1376,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt64:&value forKey:4U]);
   XCTAssertEqual(value, 403);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1531,7 +1538,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32BoolDictionary *dict = [GPBUInt32BoolDictionary dictionaryWithBool:YES forKey:1U];
+  GPBUInt32BoolDictionary *dict = [[GPBUInt32BoolDictionary alloc] init];
+  [dict setBool:YES forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1544,6 +1552,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, YES);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1686,17 +1695,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32BoolDictionary *dict2 =
-      [GPBUInt32BoolDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32BoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32BoolDictionary *dict = [GPBUInt32BoolDictionary dictionary];
+  GPBUInt32BoolDictionary *dict = [[GPBUInt32BoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1727,6 +1737,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getBool:&value forKey:4U]);
   XCTAssertEqual(value, NO);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1888,7 +1899,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32FloatDictionary *dict = [GPBUInt32FloatDictionary dictionaryWithFloat:500.f forKey:1U];
+  GPBUInt32FloatDictionary *dict = [[GPBUInt32FloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1901,6 +1913,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2043,17 +2056,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32FloatDictionary *dict2 =
-      [GPBUInt32FloatDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32FloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32FloatDictionary *dict = [GPBUInt32FloatDictionary dictionary];
+  GPBUInt32FloatDictionary *dict = [[GPBUInt32FloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2084,6 +2098,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getFloat:&value forKey:4U]);
   XCTAssertEqual(value, 503.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2245,7 +2260,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32DoubleDictionary *dict = [GPBUInt32DoubleDictionary dictionaryWithDouble:600. forKey:1U];
+  GPBUInt32DoubleDictionary *dict = [[GPBUInt32DoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -2258,6 +2274,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2400,17 +2417,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32DoubleDictionary *dict2 =
-      [GPBUInt32DoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32DoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32DoubleDictionary *dict = [GPBUInt32DoubleDictionary dictionary];
+  GPBUInt32DoubleDictionary *dict = [[GPBUInt32DoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2441,6 +2459,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getDouble:&value forKey:4U]);
   XCTAssertEqual(value, 603.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2602,7 +2621,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32EnumDictionary *dict = [GPBUInt32EnumDictionary dictionaryWithEnum:700 forKey:1U];
+  GPBUInt32EnumDictionary *dict = [[GPBUInt32EnumDictionary alloc] init];
+  [dict setEnum:700 forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -2615,6 +2635,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 700);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2757,17 +2778,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32EnumDictionary *dict2 =
-      [GPBUInt32EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32EnumDictionary *dict = [GPBUInt32EnumDictionary dictionary];
+  GPBUInt32EnumDictionary *dict = [[GPBUInt32EnumDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2798,6 +2820,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getEnum:&value forKey:4U]);
   XCTAssertEqual(value, 703);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -3120,19 +3143,20 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32EnumDictionary *dict2 =
-      [GPBUInt32EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
   XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+  [dict2 release];
   [dict release];
 }
 
 - (void)testUnknownAdds {
   GPBUInt32EnumDictionary *dict =
-    [GPBUInt32EnumDictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+      [[GPBUInt32EnumDictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3172,6 +3196,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getRawValue:&value forKey:4U]);
   XCTAssertEqual(value, 803);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testUnknownRemove {
@@ -3375,7 +3400,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt32ObjectDictionary<NSString*> *dict = [GPBUInt32ObjectDictionary dictionaryWithObject:@"abc" forKey:1U];
+  GPBUInt32ObjectDictionary<NSString*> *dict = [[GPBUInt32ObjectDictionary alloc] init];
+  [dict setObject:@"abc" forKey:1U];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   XCTAssertEqualObjects([dict objectForKey:1U], @"abc");
@@ -3385,6 +3411,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqualObjects(aObject, @"abc");
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -3520,17 +3547,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt32ObjectDictionary<NSString*> *dict2 =
-      [GPBUInt32ObjectDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt32ObjectDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt32ObjectDictionary<NSString*> *dict = [GPBUInt32ObjectDictionary dictionary];
+  GPBUInt32ObjectDictionary<NSString*> *dict = [[GPBUInt32ObjectDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3552,6 +3580,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertEqualObjects([dict objectForKey:3U], @"ghi");
   XCTAssertEqualObjects([dict objectForKey:4U], @"jkl");
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests+UInt64.m b/objectivec/Tests/GPBDictionaryTests+UInt64.m
index 94c116f6..ccd063f5 100644
--- a/objectivec/Tests/GPBDictionaryTests+UInt64.m
+++ b/objectivec/Tests/GPBDictionaryTests+UInt64.m
@@ -45,7 +45,6 @@
 
 // To let the testing macros work, add some extra methods to simplify things.
 @interface GPBUInt64EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(uint64_t)key;
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const uint64_t [])keys
                         count:(NSUInteger)count;
@@ -64,14 +63,6 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 @implementation GPBUInt64EnumDictionary (TestingTweak)
-+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(uint64_t)key {
-  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-  // type correct.
-  return [[(GPBUInt64EnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-                                                                   rawValues:&value
-                                                                     forKeys:&key
-                                                                       count:1] autorelease];
-}
 - (instancetype)initWithEnums:(const int32_t [])values
                       forKeys:(const uint64_t [])keys
                         count:(NSUInteger)count {
@@ -103,7 +94,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64UInt32Dictionary *dict = [GPBUInt64UInt32Dictionary dictionaryWithUInt32:100U forKey:31ULL];
+  GPBUInt64UInt32Dictionary *dict = [[GPBUInt64UInt32Dictionary alloc] init];
+  [dict setUInt32:100U forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint32_t value;
@@ -116,6 +108,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 100U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -258,17 +251,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64UInt32Dictionary *dict2 =
-      [GPBUInt64UInt32Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64UInt32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64UInt32Dictionary *dict = [GPBUInt64UInt32Dictionary dictionary];
+  GPBUInt64UInt32Dictionary *dict = [[GPBUInt64UInt32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -299,6 +293,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt32:&value forKey:34ULL]);
   XCTAssertEqual(value, 103U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -460,7 +455,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64Int32Dictionary *dict = [GPBUInt64Int32Dictionary dictionaryWithInt32:200 forKey:31ULL];
+  GPBUInt64Int32Dictionary *dict = [[GPBUInt64Int32Dictionary alloc] init];
+  [dict setInt32:200 forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -473,6 +469,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 200);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -615,17 +612,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64Int32Dictionary *dict2 =
-      [GPBUInt64Int32Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64Int32Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64Int32Dictionary *dict = [GPBUInt64Int32Dictionary dictionary];
+  GPBUInt64Int32Dictionary *dict = [[GPBUInt64Int32Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -656,6 +654,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt32:&value forKey:34ULL]);
   XCTAssertEqual(value, 203);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -817,7 +816,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64UInt64Dictionary *dict = [GPBUInt64UInt64Dictionary dictionaryWithUInt64:300U forKey:31ULL];
+  GPBUInt64UInt64Dictionary *dict = [[GPBUInt64UInt64Dictionary alloc] init];
+  [dict setUInt64:300U forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   uint64_t value;
@@ -830,6 +830,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 300U);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -972,17 +973,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64UInt64Dictionary *dict2 =
-      [GPBUInt64UInt64Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64UInt64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64UInt64Dictionary *dict = [GPBUInt64UInt64Dictionary dictionary];
+  GPBUInt64UInt64Dictionary *dict = [[GPBUInt64UInt64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1013,6 +1015,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getUInt64:&value forKey:34ULL]);
   XCTAssertEqual(value, 303U);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1174,7 +1177,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64Int64Dictionary *dict = [GPBUInt64Int64Dictionary dictionaryWithInt64:400 forKey:31ULL];
+  GPBUInt64Int64Dictionary *dict = [[GPBUInt64Int64Dictionary alloc] init];
+  [dict setInt64:400 forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int64_t value;
@@ -1187,6 +1191,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 400);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1329,17 +1334,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64Int64Dictionary *dict2 =
-      [GPBUInt64Int64Dictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64Int64Dictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64Int64Dictionary *dict = [GPBUInt64Int64Dictionary dictionary];
+  GPBUInt64Int64Dictionary *dict = [[GPBUInt64Int64Dictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1370,6 +1376,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getInt64:&value forKey:34ULL]);
   XCTAssertEqual(value, 403);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1531,7 +1538,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64BoolDictionary *dict = [GPBUInt64BoolDictionary dictionaryWithBool:YES forKey:31ULL];
+  GPBUInt64BoolDictionary *dict = [[GPBUInt64BoolDictionary alloc] init];
+  [dict setBool:YES forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   BOOL value;
@@ -1544,6 +1552,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, YES);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -1686,17 +1695,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64BoolDictionary *dict2 =
-      [GPBUInt64BoolDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64BoolDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64BoolDictionary *dict = [GPBUInt64BoolDictionary dictionary];
+  GPBUInt64BoolDictionary *dict = [[GPBUInt64BoolDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -1727,6 +1737,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getBool:&value forKey:34ULL]);
   XCTAssertEqual(value, NO);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -1888,7 +1899,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64FloatDictionary *dict = [GPBUInt64FloatDictionary dictionaryWithFloat:500.f forKey:31ULL];
+  GPBUInt64FloatDictionary *dict = [[GPBUInt64FloatDictionary alloc] init];
+  [dict setFloat:500.f forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   float value;
@@ -1901,6 +1913,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 500.f);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2043,17 +2056,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64FloatDictionary *dict2 =
-      [GPBUInt64FloatDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64FloatDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64FloatDictionary *dict = [GPBUInt64FloatDictionary dictionary];
+  GPBUInt64FloatDictionary *dict = [[GPBUInt64FloatDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2084,6 +2098,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getFloat:&value forKey:34ULL]);
   XCTAssertEqual(value, 503.f);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2245,7 +2260,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64DoubleDictionary *dict = [GPBUInt64DoubleDictionary dictionaryWithDouble:600. forKey:31ULL];
+  GPBUInt64DoubleDictionary *dict = [[GPBUInt64DoubleDictionary alloc] init];
+  [dict setDouble:600. forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   double value;
@@ -2258,6 +2274,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 600.);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2400,17 +2417,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64DoubleDictionary *dict2 =
-      [GPBUInt64DoubleDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64DoubleDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64DoubleDictionary *dict = [GPBUInt64DoubleDictionary dictionary];
+  GPBUInt64DoubleDictionary *dict = [[GPBUInt64DoubleDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2441,6 +2459,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getDouble:&value forKey:34ULL]);
   XCTAssertEqual(value, 603.);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -2602,7 +2621,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64EnumDictionary *dict = [GPBUInt64EnumDictionary dictionaryWithEnum:700 forKey:31ULL];
+  GPBUInt64EnumDictionary *dict = [[GPBUInt64EnumDictionary alloc] init];
+  [dict setEnum:700 forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   int32_t value;
@@ -2615,6 +2635,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqual(aValue, 700);
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -2757,17 +2778,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64EnumDictionary *dict2 =
-      [GPBUInt64EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64EnumDictionary *dict = [GPBUInt64EnumDictionary dictionary];
+  GPBUInt64EnumDictionary *dict = [[GPBUInt64EnumDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -2798,6 +2820,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getEnum:&value forKey:34ULL]);
   XCTAssertEqual(value, 703);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
@@ -3120,19 +3143,20 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64EnumDictionary *dict2 =
-      [GPBUInt64EnumDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64EnumDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
   XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+  [dict2 release];
   [dict release];
 }
 
 - (void)testUnknownAdds {
   GPBUInt64EnumDictionary *dict =
-    [GPBUInt64EnumDictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+      [[GPBUInt64EnumDictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3172,6 +3196,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertTrue([dict getRawValue:&value forKey:34ULL]);
   XCTAssertEqual(value, 803);
   [dict2 release];
+  [dict release];
 }
 
 - (void)testUnknownRemove {
@@ -3375,7 +3400,8 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
 }
 
 - (void)testOne {
-  GPBUInt64ObjectDictionary<NSString*> *dict = [GPBUInt64ObjectDictionary dictionaryWithObject:@"abc" forKey:31ULL];
+  GPBUInt64ObjectDictionary<NSString*> *dict = [[GPBUInt64ObjectDictionary alloc] init];
+  [dict setObject:@"abc" forKey:31ULL];
   XCTAssertNotNil(dict);
   XCTAssertEqual(dict.count, 1U);
   XCTAssertEqualObjects([dict objectForKey:31ULL], @"abc");
@@ -3385,6 +3411,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
     XCTAssertEqualObjects(aObject, @"abc");
     XCTAssertNotEqual(stop, NULL);
   }];
+  [dict release];
 }
 
 - (void)testBasics {
@@ -3520,17 +3547,18 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertNotNil(dict);
 
   GPBUInt64ObjectDictionary<NSString*> *dict2 =
-      [GPBUInt64ObjectDictionary dictionaryWithDictionary:dict];
+      [[GPBUInt64ObjectDictionary alloc] initWithDictionary:dict];
   XCTAssertNotNil(dict2);
 
   // Should be new pointer, but equal objects.
   XCTAssertNotEqual(dict, dict2);
   XCTAssertEqualObjects(dict, dict2);
+  [dict2 release];
   [dict release];
 }
 
 - (void)testAdds {
-  GPBUInt64ObjectDictionary<NSString*> *dict = [GPBUInt64ObjectDictionary dictionary];
+  GPBUInt64ObjectDictionary<NSString*> *dict = [[GPBUInt64ObjectDictionary alloc] init];
   XCTAssertNotNil(dict);
 
   XCTAssertEqual(dict.count, 0U);
@@ -3552,6 +3580,7 @@ static BOOL TestingEnum_IsValidValue(int32_t value) {
   XCTAssertEqualObjects([dict objectForKey:33ULL], @"ghi");
   XCTAssertEqualObjects([dict objectForKey:34ULL], @"jkl");
   [dict2 release];
+  [dict release];
 }
 
 - (void)testRemove {
diff --git a/objectivec/Tests/GPBDictionaryTests.pddm b/objectivec/Tests/GPBDictionaryTests.pddm
index d6aa7211..17f12c28 100644
--- a/objectivec/Tests/GPBDictionaryTests.pddm
+++ b/objectivec/Tests/GPBDictionaryTests.pddm
@@ -78,7 +78,8 @@
 //%}
 //%
 //%- (void)testOne {
-//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWith##VALUE_NAME$u##:VAL1 forKey:KEY1];
+//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] init];
+//%  [dict set##VALUE_NAME$u##:VAL1 forKey:KEY1];
 //%  XCTAssertNotNil(dict);
 //%  XCTAssertEqual(dict.count, 1U);
 //%DECLARE_VALUE_STORAGE##VHELPER(VALUE_TYPE, VNAME)TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY1, VAL1)
@@ -88,6 +89,7 @@
 //%    XCTAssertEqual##VSUFFIX(a##VNAME$u, VAL1);
 //%    XCTAssertNotEqual(stop, NULL);
 //%  }];
+//%  [dict release];
 //%}
 //%
 //%- (void)testBasics {
@@ -223,17 +225,18 @@
 //%  XCTAssertNotNil(dict);
 //%
 //%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict2 =
-//%      [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWithDictionary:dict];
+//%      [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] initWithDictionary:dict];
 //%  XCTAssertNotNil(dict2);
 //%
 //%  // Should be new pointer, but equal objects.
 //%  XCTAssertNotEqual(dict, dict2);
 //%  XCTAssertEqualObjects(dict, dict2);
+//%  [dict2 release];
 //%  [dict release];
 //%}
 //%
 //%- (void)testAdds {
-//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionary];
+//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] init];
 //%  XCTAssertNotNil(dict);
 //%
 //%  XCTAssertEqual(dict.count, 0U);
@@ -255,6 +258,7 @@
 //%TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY3, VAL3)
 //%TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY4, VAL4)
 //%  [dict2 release];
+//%  [dict release];
 //%}
 //%
 //%- (void)testRemove {
@@ -522,19 +526,20 @@
 //%  XCTAssertNotNil(dict);
 //%
 //%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict2 =
-//%      [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWithDictionary:dict];
+//%      [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] initWithDictionary:dict];
 //%  XCTAssertNotNil(dict2);
 //%
 //%  // Should be new pointer, but equal objects.
 //%  XCTAssertNotEqual(dict, dict2);
 //%  XCTAssertEqualObjects(dict, dict2);
 //%  XCTAssertEqual(dict.validationFunc, dict2.validationFunc);  // Pointer comparison
+//%  [dict2 release];
 //%  [dict release];
 //%}
 //%
 //%- (void)testUnknownAdds {
 //%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict =
-//%    [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWithValidationFunction:TestingEnum_IsValidValue];
+//%      [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] initWithValidationFunction:TestingEnum_IsValidValue];
 //%  XCTAssertNotNil(dict);
 //%
 //%  XCTAssertEqual(dict.count, 0U);
@@ -561,6 +566,7 @@
 //%TEST_VALUE##VHELPER(VALUE_NAME, dict, value, KEY4, kGPBUnrecognizedEnumeratorValue)
 //%TEST_RAW_VALUE##VHELPER(dict, value, KEY4, VAL4)
 //%  [dict2 release];
+//%  [dict release];
 //%}
 //%
 //%- (void)testUnknownRemove {
@@ -729,7 +735,6 @@
 //%PDDM-DEFINE TEST_HELPERS(KEY_NAME, KEY_TYPE, KisP)
 //%// To let the testing macros work, add some extra methods to simplify things.
 //%@interface GPB##KEY_NAME##EnumDictionary (TestingTweak)
-//%+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(KEY_TYPE##KisP$S##KisP)key;
 //%- (instancetype)initWithEnums:(const int32_t [])values
 //%                      forKeys:(const KEY_TYPE##KisP$S##KisP [])keys
 //%                        count:(NSUInteger)count;
@@ -748,14 +753,6 @@
 //%}
 //%
 //%@implementation GPB##KEY_NAME##EnumDictionary (TestingTweak)
-//%+ (instancetype)dictionaryWithEnum:(int32_t)value forKey:(KEY_TYPE##KisP$S##KisP)key {
-//%  // Cast is needed to compiler knows what class we are invoking initWithValues: on to get the
-//%  // type correct.
-//%  return [[(GPB##KEY_NAME##EnumDictionary*)[self alloc] initWithValidationFunction:TestingEnum_IsValidValue
-//%                KEY_NAME$S                                             rawValues:&value
-//%                KEY_NAME$S                                               forKeys:&key
-//%                KEY_NAME$S                                                 count:1] autorelease];
-//%}
 //%- (instancetype)initWithEnums:(const int32_t [])values
 //%                      forKeys:(const KEY_TYPE##KisP$S##KisP [])keys
 //%                        count:(NSUInteger)count {
@@ -801,7 +798,8 @@
 //%}
 //%
 //%- (void)testOne {
-//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWith##VALUE_NAME$u##:VAL1 forKey:KEY1];
+//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] init];
+//%  [dict set##VALUE_NAME$u##:VAL1 forKey:KEY1];
 //%  XCTAssertNotNil(dict);
 //%  XCTAssertEqual(dict.count, 1U);
 //%DECLARE_VALUE_STORAGE##VHELPER(VALUE_TYPE, VNAME)TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY1, VAL1)
@@ -811,6 +809,7 @@
 //%    XCTAssertEqual##VSUFFIX(a##VNAME$u, VAL1);
 //%    XCTAssertNotEqual(stop, NULL);
 //%  }];
+//%  [dict release];
 //%}
 //%
 //%- (void)testBasics {
@@ -944,17 +943,18 @@
 //%  XCTAssertNotNil(dict);
 //%
 //%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict2 =
-//%      [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionaryWithDictionary:dict];
+//%      [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] initWithDictionary:dict];
 //%  XCTAssertNotNil(dict2);
 //%
 //%  // Should be new pointer, but equal objects.
 //%  XCTAssertNotEqual(dict, dict2);
 //%  XCTAssertEqualObjects(dict, dict2);
+//%  [dict2 release];
 //%  [dict release];
 //%}
 //%
 //%- (void)testAdds {
-//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [GPB##KEY_NAME##VALUE_NAME##Dictionary dictionary];
+//%  DICTIONARY_CLASS_DECL##VHELPER(KEY_NAME, VALUE_NAME, VALUE_TYPE) *dict = [[GPB##KEY_NAME##VALUE_NAME##Dictionary alloc] init];
 //%  XCTAssertNotNil(dict);
 //%
 //%  XCTAssertEqual(dict.count, 0U);
@@ -974,6 +974,7 @@
 //%DECLARE_VALUE_STORAGE##VHELPER(VALUE_TYPE, VNAME)TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY1, VAL1)
 //%TEST_VALUE##VHELPER(VALUE_NAME, dict, VNAME, KEY2, VAL2)
 //%  [dict2 release];
+//%  [dict release];
 //%}
 //%
 //%- (void)testRemove {
diff --git a/objectivec/Tests/GPBExtensionRegistryTest.m b/objectivec/Tests/GPBExtensionRegistryTest.m
new file mode 100644
index 00000000..b1168826
--- /dev/null
+++ b/objectivec/Tests/GPBExtensionRegistryTest.m
@@ -0,0 +1,138 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#import "GPBTestUtilities.h"
+
+#import "GPBExtensionRegistry.h"
+#import "google/protobuf/Unittest.pbobjc.h"
+
+@interface GPBExtensionRegistryTest : GPBTestCase
+@end
+
+@implementation GPBExtensionRegistryTest
+
+- (void)testBasics {
+  GPBExtensionRegistry *reg = [[[GPBExtensionRegistry alloc] init] autorelease];
+  XCTAssertNotNil(reg);
+
+  XCTAssertNil([reg extensionForDescriptor:[TestAllExtensions descriptor]
+                               fieldNumber:1]);
+  XCTAssertNil([reg extensionForDescriptor:[TestAllTypes descriptor]
+                               fieldNumber:1]);
+
+  [reg addExtension:[UnittestRoot optionalInt32Extension]];
+  [reg addExtension:[UnittestRoot packedInt64Extension]];
+
+  XCTAssertTrue([reg extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:1] ==
+                [UnittestRoot optionalInt32Extension]); // ptr equality
+  XCTAssertNil([reg extensionForDescriptor:[TestAllTypes descriptor]
+                               fieldNumber:1]);
+  XCTAssertTrue([reg extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:91] ==
+                [UnittestRoot packedInt64Extension]); // ptr equality
+}
+
+- (void)testCopy {
+  GPBExtensionRegistry *reg1 = [[[GPBExtensionRegistry alloc] init] autorelease];
+  [reg1 addExtension:[UnittestRoot optionalInt32Extension]];
+
+  GPBExtensionRegistry *reg2 = [[reg1 copy] autorelease];
+  XCTAssertNotNil(reg2);
+
+  XCTAssertTrue([reg1 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:1] ==
+                [UnittestRoot optionalInt32Extension]); // ptr equality
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:1] ==
+                [UnittestRoot optionalInt32Extension]); // ptr equality
+
+  // Message class that had registered extension(s) at the -copy time.
+
+  [reg1 addExtension:[UnittestRoot optionalBoolExtension]];
+  [reg2 addExtension:[UnittestRoot optionalStringExtension]];
+
+  XCTAssertTrue([reg1 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:13] ==
+                [UnittestRoot optionalBoolExtension]); // ptr equality
+  XCTAssertNil([reg1 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:14]);
+  XCTAssertNil([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:13]);
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:14] ==
+                [UnittestRoot optionalStringExtension]); // ptr equality
+
+  // Message class that did not have any registered extensions at the -copy time.
+
+  [reg1 addExtension:[UnittestRoot packedInt64Extension]];
+  [reg2 addExtension:[UnittestRoot packedSint32Extension]];
+
+  XCTAssertTrue([reg1 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:91] ==
+                [UnittestRoot packedInt64Extension]); // ptr equality
+  XCTAssertNil([reg1 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:94]);
+  XCTAssertNil([reg2 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:91]);
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:94] ==
+                [UnittestRoot packedSint32Extension]); // ptr equality
+
+}
+
+- (void)testAddExtensions {
+  GPBExtensionRegistry *reg1 = [[[GPBExtensionRegistry alloc] init] autorelease];
+  [reg1 addExtension:[UnittestRoot optionalInt32Extension]];
+
+  GPBExtensionRegistry *reg2 = [[[GPBExtensionRegistry alloc] init] autorelease];
+
+  XCTAssertNil([reg2 extensionForDescriptor:[TestAllExtensions descriptor]
+                                fieldNumber:1]);
+
+  [reg2 addExtensions:reg1];
+
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:1] ==
+                [UnittestRoot optionalInt32Extension]); // ptr equality
+
+  // Confirm adding to the first doesn't add to the second.
+
+  [reg1 addExtension:[UnittestRoot optionalBoolExtension]];
+  [reg1 addExtension:[UnittestRoot packedInt64Extension]];
+
+  XCTAssertTrue([reg1 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:13] ==
+                [UnittestRoot optionalBoolExtension]); // ptr equality
+  XCTAssertTrue([reg1 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:91] ==
+                [UnittestRoot packedInt64Extension]); // ptr equality
+  XCTAssertNil([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:13]);
+  XCTAssertNil([reg2 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:91]);
+
+  // Confirm adding to the second doesn't add to the first.
+
+  [reg2 addExtension:[UnittestRoot optionalStringExtension]];
+  [reg2 addExtension:[UnittestRoot packedSint32Extension]];
+
+  XCTAssertNil([reg1 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:14]);
+  XCTAssertNil([reg1 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:94]);
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestAllExtensions descriptor] fieldNumber:14] ==
+                [UnittestRoot optionalStringExtension]); // ptr equality
+  XCTAssertTrue([reg2 extensionForDescriptor:[TestPackedExtensions descriptor] fieldNumber:94] ==
+                [UnittestRoot packedSint32Extension]); // ptr equality
+}
+
+@end
diff --git a/objectivec/Tests/GPBMessageTests+Serialization.m b/objectivec/Tests/GPBMessageTests+Serialization.m
index 763af2b0..921feab7 100644
--- a/objectivec/Tests/GPBMessageTests+Serialization.m
+++ b/objectivec/Tests/GPBMessageTests+Serialization.m
@@ -42,10 +42,6 @@
 #import "google/protobuf/UnittestRuntimeProto2.pbobjc.h"
 #import "google/protobuf/UnittestRuntimeProto3.pbobjc.h"
 
-static NSData *DataFromCStr(const char *str) {
-  return [NSData dataWithBytes:str length:strlen(str)];
-}
-
 @interface MessageSerializationTests : GPBTestCase
 @end
 
@@ -113,35 +109,6 @@ static NSData *DataFromCStr(const char *str) {
   [msg release];
 }
 
-- (void)testProto3DroppingUnknownFields {
-  DropUnknownsFooWithExtraFields *fooWithExtras =
-      [[DropUnknownsFooWithExtraFields alloc] init];
-
-  fooWithExtras.int32Value = 1;
-  fooWithExtras.enumValue = DropUnknownsFooWithExtraFields_NestedEnum_Baz;
-  fooWithExtras.extraInt32Value = 2;
-
-  NSData *data = [fooWithExtras data];
-  XCTAssertNotNil(data);
-  DropUnknownsFoo *foo = [DropUnknownsFoo parseFromData:data error:NULL];
-
-  XCTAssertEqual(foo.int32Value, 1);
-  XCTAssertEqual(foo.enumValue, DropUnknownsFoo_NestedEnum_Baz);
-  // Nothing should end up in the unknowns.
-  XCTAssertEqual([foo.unknownFields countOfFields], 0U);
-
-  [fooWithExtras release];
-  data = [foo data];
-  fooWithExtras =
-      [DropUnknownsFooWithExtraFields parseFromData:data error:NULL];
-  XCTAssertEqual(fooWithExtras.int32Value, 1);
-  XCTAssertEqual(fooWithExtras.enumValue,
-                 DropUnknownsFooWithExtraFields_NestedEnum_Baz);
-  // And the extra value is gone (back to the default).
-  XCTAssertEqual(fooWithExtras.extraInt32Value, 0);
-  XCTAssertEqual([foo.unknownFields countOfFields], 0U);
-}
-
 - (void)testProto2UnknownEnumToUnknownField {
   Message3 *orig = [[Message3 alloc] init];
 
@@ -946,17 +913,60 @@ static NSData *DataFromCStr(const char *str) {
   XCTAssertEqual(error.code, GPBCodedInputStreamErrorInvalidTag);
 }
 
+- (void)testZeroFieldNum {
+  // These are ConformanceTestSuite::TestIllegalTags.
+
+  const char *tests[] = {
+    "\1DEADBEEF",
+    "\2\1\1",
+    "\3\4",
+    "\5DEAD"
+  };
+
+  for (size_t i = 0; i < GPBARRAYSIZE(tests); ++i) {
+    NSData *data = DataFromCStr(tests[i]);
+
+    {
+      // Message from proto2 syntax file
+      NSError *error = nil;
+      Message2 *msg = [Message2 parseFromData:data error:&error];
+      XCTAssertNil(msg, @"i = %zd", i);
+      XCTAssertNotNil(error, @"i = %zd", i);
+      XCTAssertEqualObjects(error.domain, GPBCodedInputStreamErrorDomain, @"i = %zd", i);
+      XCTAssertEqual(error.code, GPBCodedInputStreamErrorInvalidTag, @"i = %zd", i);
+    }
+
+    {
+      // Message from proto3 syntax file
+      NSError *error = nil;
+      Message3 *msg = [Message3 parseFromData:data error:&error];
+      XCTAssertNil(msg, @"i = %zd", i);
+      XCTAssertNotNil(error, @"i = %zd", i);
+      XCTAssertEqualObjects(error.domain, GPBCodedInputStreamErrorDomain, @"i = %zd", i);
+      XCTAssertEqual(error.code, GPBCodedInputStreamErrorInvalidTag, @"i = %zd", i);
+    }
+  }
+}
+
 - (void)testErrorRecursionDepthReached {
   NSData *data = DataFromCStr(
-      "\x0A\x86\x01\x0A\x83\x01\x0A\x80\x01\x0A\x7E\x0A\x7C\x0A\x7A\x0A\x78"
-      "\x0A\x76\x0A\x74\x0A\x72\x0A\x70\x0A\x6E\x0A\x6C\x0A\x6A\x0A\x68"
-      "\x0A\x66\x0A\x64\x0A\x62\x0A\x60\x0A\x5E\x0A\x5C\x0A\x5A\x0A\x58"
-      "\x0A\x56\x0A\x54\x0A\x52\x0A\x50\x0A\x4E\x0A\x4C\x0A\x4A\x0A\x48"
-      "\x0A\x46\x0A\x44\x0A\x42\x0A\x40\x0A\x3E\x0A\x3C\x0A\x3A\x0A\x38"
-      "\x0A\x36\x0A\x34\x0A\x32\x0A\x30\x0A\x2E\x0A\x2C\x0A\x2A\x0A\x28"
-      "\x0A\x26\x0A\x24\x0A\x22\x0A\x20\x0A\x1E\x0A\x1C\x0A\x1A\x0A\x18"
-      "\x0A\x16\x0A\x14\x0A\x12\x0A\x10\x0A\x0E\x0A\x0C\x0A\x0A\x0A\x08"
-      "\x0A\x06\x12\x04\x72\x02\x4B\x50");
+      "\x0A\xF2\x01\x0A\xEF\x01\x0A\xEC\x01\x0A\xE9\x01\x0A\xE6\x01"
+      "\x0A\xE3\x01\x0A\xE0\x01\x0A\xDD\x01\x0A\xDA\x01\x0A\xD7\x01"
+      "\x0A\xD4\x01\x0A\xD1\x01\x0A\xCE\x01\x0A\xCB\x01\x0A\xC8\x01"
+      "\x0A\xC5\x01\x0A\xC2\x01\x0A\xBF\x01\x0A\xBC\x01\x0A\xB9\x01"
+      "\x0A\xB6\x01\x0A\xB3\x01\x0A\xB0\x01\x0A\xAD\x01\x0A\xAA\x01"
+      "\x0A\xA7\x01\x0A\xA4\x01\x0A\xA1\x01\x0A\x9E\x01\x0A\x9B\x01"
+      "\x0A\x98\x01\x0A\x95\x01\x0A\x92\x01\x0A\x8F\x01\x0A\x8C\x01"
+      "\x0A\x89\x01\x0A\x86\x01\x0A\x83\x01\x0A\x80\x01\x0A\x7E"
+      "\x0A\x7C\x0A\x7A\x0A\x78\x0A\x76\x0A\x74\x0A\x72\x0A\x70"
+      "\x0A\x6E\x0A\x6C\x0A\x6A\x0A\x68\x0A\x66\x0A\x64\x0A\x62"
+      "\x0A\x60\x0A\x5E\x0A\x5C\x0A\x5A\x0A\x58\x0A\x56\x0A\x54"
+      "\x0A\x52\x0A\x50\x0A\x4E\x0A\x4C\x0A\x4A\x0A\x48\x0A\x46"
+      "\x0A\x44\x0A\x42\x0A\x40\x0A\x3E\x0A\x3C\x0A\x3A\x0A\x38"
+      "\x0A\x36\x0A\x34\x0A\x32\x0A\x30\x0A\x2E\x0A\x2C\x0A\x2A"
+      "\x0A\x28\x0A\x26\x0A\x24\x0A\x22\x0A\x20\x0A\x1E\x0A\x1C"
+      "\x0A\x1A\x0A\x18\x0A\x16\x0A\x14\x0A\x12\x0A\x10\x0A\x0E"
+      "\x0A\x0C\x0A\x0A\x0A\x08\x0A\x06\x12\x04\x72\x02\x4B\x50");
   NSError *error = nil;
   NestedTestAllTypes *msg = [NestedTestAllTypes parseFromData:data
                                                         error:&error];
@@ -966,6 +976,16 @@ static NSData *DataFromCStr(const char *str) {
   XCTAssertEqual(error.code, GPBCodedInputStreamErrorRecursionDepthExceeded);
 }
 
+- (void)testParseDelimitedDataWithNegativeSize {
+  NSData *data = DataFromCStr("\xFF\xFF\xFF\xFF\x0F");
+  GPBCodedInputStream *input = [GPBCodedInputStream streamWithData:data];
+  NSError *error;
+  [GPBMessage parseDelimitedFromCodedInputStream:input
+                               extensionRegistry:nil
+                                           error:&error];
+  XCTAssertNil(error);
+}
+
 #ifdef DEBUG
 - (void)testErrorMissingRequiredField {
   NSData *data = DataFromCStr("");
@@ -1094,10 +1114,10 @@ static NSData *DataFromCStr(const char *str) {
 - (void)testMap_Proto2UnknownEnum {
   TestEnumMapPlusExtra *orig = [[TestEnumMapPlusExtra alloc] init];
 
-  orig.knownMapField = [GPBInt32EnumDictionary
-      dictionaryWithValidationFunction:Proto2MapEnumPlusExtra_IsValidValue];
-  orig.unknownMapField = [GPBInt32EnumDictionary
-      dictionaryWithValidationFunction:Proto2MapEnumPlusExtra_IsValidValue];
+  orig.knownMapField = [[[GPBInt32EnumDictionary alloc]
+      initWithValidationFunction:Proto2MapEnumPlusExtra_IsValidValue] autorelease];
+  orig.unknownMapField = [[[GPBInt32EnumDictionary alloc]
+      initWithValidationFunction:Proto2MapEnumPlusExtra_IsValidValue] autorelease];
   [orig.knownMapField setEnum:Proto2MapEnumPlusExtra_EProto2MapEnumFoo
                        forKey:0];
   [orig.unknownMapField setEnum:Proto2MapEnumPlusExtra_EProto2MapEnumExtra
@@ -1141,22 +1161,27 @@ static NSData *DataFromCStr(const char *str) {
   [msg.mapInt32Int32 setInt32:101 forKey:2001];
   [msg.mapInt64Int64 setInt64:1002 forKey:202];
   [msg.mapInt64Int64 setInt64:103 forKey:2003];
+  [msg.mapInt64Int64 setInt64:4294967296 forKey:4294967297];
   [msg.mapUint32Uint32 setUInt32:1004 forKey:204];
   [msg.mapUint32Uint32 setUInt32:105 forKey:2005];
   [msg.mapUint64Uint64 setUInt64:1006 forKey:206];
   [msg.mapUint64Uint64 setUInt64:107 forKey:2007];
+  [msg.mapUint64Uint64 setUInt64:4294967298 forKey:4294967299];
   [msg.mapSint32Sint32 setInt32:1008 forKey:208];
   [msg.mapSint32Sint32 setInt32:109 forKey:2009];
   [msg.mapSint64Sint64 setInt64:1010 forKey:210];
   [msg.mapSint64Sint64 setInt64:111 forKey:2011];
+  [msg.mapSint64Sint64 setInt64:4294967300 forKey:4294967301];
   [msg.mapFixed32Fixed32 setUInt32:1012 forKey:212];
   [msg.mapFixed32Fixed32 setUInt32:113 forKey:2013];
   [msg.mapFixed64Fixed64 setUInt64:1014 forKey:214];
   [msg.mapFixed64Fixed64 setUInt64:115 forKey:2015];
+  [msg.mapFixed64Fixed64 setUInt64:4294967302 forKey:4294967303];
   [msg.mapSfixed32Sfixed32 setInt32:1016 forKey:216];
   [msg.mapSfixed32Sfixed32 setInt32:117 forKey:2017];
   [msg.mapSfixed64Sfixed64 setInt64:1018 forKey:218];
   [msg.mapSfixed64Sfixed64 setInt64:119 forKey:2019];
+  [msg.mapSfixed64Sfixed64 setInt64:4294967304 forKey:4294967305];
   [msg.mapInt32Float setFloat:1020.f forKey:220];
   [msg.mapInt32Float setFloat:121.f forKey:2021];
   [msg.mapInt32Double setDouble:1022. forKey:222];
diff --git a/objectivec/Tests/GPBMessageTests.m b/objectivec/Tests/GPBMessageTests.m
index c15535c5..a3149096 100644
--- a/objectivec/Tests/GPBMessageTests.m
+++ b/objectivec/Tests/GPBMessageTests.m
@@ -1238,7 +1238,8 @@
   // with different objects that are equal).
   TestRecursiveMessageWithRepeatedField *message3 =
       [TestRecursiveMessageWithRepeatedField message];
-  message3.iToI = [GPBInt32Int32Dictionary dictionaryWithInt32:10 forKey:20];
+  message3.iToI = [[[GPBInt32Int32Dictionary alloc] init] autorelease];
+  [message3.iToI setInt32:10 forKey:20];
   message3.strToStr =
       [NSMutableDictionary dictionaryWithObject:@"abc" forKey:@"123"];
   XCTAssertNotNil(message.iToI);
@@ -1323,7 +1324,8 @@
     XCTAssertFalse([message hasA]);
     GPBInt32Int32Dictionary *iToI = [message.a.iToI retain];
     XCTAssertEqual(iToI->_autocreator, message.a);  // Pointer comparision
-    message.a.iToI = [GPBInt32Int32Dictionary dictionaryWithInt32:6 forKey:7];
+    message.a.iToI = [[[GPBInt32Int32Dictionary alloc] init] autorelease];
+    [message.a.iToI setInt32:6 forKey:7];
     XCTAssertTrue([message hasA]);
     XCTAssertNotEqual(message.a.iToI, iToI);  // Pointer comparision
     XCTAssertNil(iToI->_autocreator);
@@ -2050,4 +2052,55 @@
   XCTAssertEqual([msg1 hash], [msg1Prime hash]);
 }
 
+- (void)testCopyingMapFileds {
+  TestMessageOfMaps *msg = [TestMessageOfMaps message];
+
+  msg.strToStr[@"foo"] = @"bar";
+
+  [msg.strToInt setInt32:1 forKey:@"mumble"];
+  [msg.intToStr setObject:@"wee" forKey:42];
+  [msg.intToInt setInt32:123 forKey:321];
+
+  [msg.strToBool setBool:YES forKey:@"one"];
+  [msg.boolToStr setObject:@"something" forKey:YES];
+  [msg.boolToBool setBool:YES forKey:NO];
+
+  [msg.intToBool setBool:YES forKey:13];
+  [msg.boolToInt setInt32:111 forKey:NO];
+
+  TestAllTypes *subMsg1 = [TestAllTypes message];
+  subMsg1.optionalInt32 = 1;
+  TestAllTypes *subMsg2 = [TestAllTypes message];
+  subMsg1.optionalInt32 = 2;
+  TestAllTypes *subMsg3 = [TestAllTypes message];
+  subMsg1.optionalInt32 = 3;
+
+  msg.strToMsg[@"baz"] = subMsg1;
+  [msg.intToMsg setObject:subMsg2 forKey:222];
+  [msg.boolToMsg setObject:subMsg3 forKey:YES];
+
+  TestMessageOfMaps *msg2 = [[msg copy] autorelease];
+  XCTAssertNotNil(msg2);
+  XCTAssertEqualObjects(msg2, msg);
+  XCTAssertTrue(msg2 != msg);  // ptr compare
+  XCTAssertTrue(msg.strToStr != msg2.strToStr);  // ptr compare
+  XCTAssertTrue(msg.intToStr != msg2.intToStr);  // ptr compare
+  XCTAssertTrue(msg.intToInt != msg2.intToInt);  // ptr compare
+  XCTAssertTrue(msg.strToBool != msg2.strToBool);  // ptr compare
+  XCTAssertTrue(msg.boolToStr != msg2.boolToStr);  // ptr compare
+  XCTAssertTrue(msg.boolToBool != msg2.boolToBool);  // ptr compare
+  XCTAssertTrue(msg.intToBool != msg2.intToBool);  // ptr compare
+  XCTAssertTrue(msg.boolToInt != msg2.boolToInt);  // ptr compare
+  XCTAssertTrue(msg.strToMsg != msg2.strToMsg);  // ptr compare
+  XCTAssertTrue(msg.intToMsg != msg2.intToMsg);  // ptr compare
+  XCTAssertTrue(msg.boolToMsg != msg2.boolToMsg);  // ptr compare
+
+  XCTAssertTrue(msg.strToMsg[@"baz"] != msg2.strToMsg[@"baz"]);  // ptr compare
+  XCTAssertEqualObjects(msg.strToMsg[@"baz"], msg2.strToMsg[@"baz"]);
+  XCTAssertTrue([msg.intToMsg objectForKey:222] != [msg2.intToMsg objectForKey:222]);  // ptr compare
+  XCTAssertEqualObjects([msg.intToMsg objectForKey:222], [msg2.intToMsg objectForKey:222]);
+  XCTAssertTrue([msg.boolToMsg objectForKey:YES] != [msg2.boolToMsg objectForKey:YES]);  // ptr compare
+  XCTAssertEqualObjects([msg.boolToMsg objectForKey:YES], [msg2.boolToMsg objectForKey:YES]);
+}
+
 @end
diff --git a/objectivec/Tests/GPBPerfTests.m b/objectivec/Tests/GPBPerfTests.m
index 1259d146..8dd0ffc5 100644
--- a/objectivec/Tests/GPBPerfTests.m
+++ b/objectivec/Tests/GPBPerfTests.m
@@ -64,6 +64,112 @@ static const uint32_t kRepeatedCount = 100;
   }];
 }
 
+- (void)testMessageSerialParsingPerformance {
+  // This and the next test are meant to monitor that the parsing functionality of protos does not
+  // lock across threads when parsing different instances. The Serial version of the test should run
+  // around ~2 times slower than the Parallel version since it's parsing the protos in the same
+  // thread.
+  TestAllTypes *allTypesMessage = [TestAllTypes message];
+  [self setAllFields:allTypesMessage repeatedCount:2];
+  NSData *allTypesData = allTypesMessage.data;
+
+  [self measureBlock:^{
+    for (int i = 0; i < 500; ++i) {
+      [TestAllTypes parseFromData:allTypesData error:NULL];
+      [TestAllTypes parseFromData:allTypesData error:NULL];
+    }
+  }];
+}
+
+- (void)testMessageParallelParsingPerformance {
+  // This and the previous test are meant to monitor that the parsing functionality of protos does
+  // not lock across threads when parsing different instances. The Serial version of the test should
+  // run around ~2 times slower than the Parallel version since it's parsing the protos in the same
+  // thread.
+  TestAllTypes *allTypesMessage = [TestAllTypes message];
+  [self setAllFields:allTypesMessage repeatedCount:2];
+  NSData *allTypesData = allTypesMessage.data;
+
+  dispatch_queue_t concurrentQueue = dispatch_queue_create("perfQueue", DISPATCH_QUEUE_CONCURRENT);
+
+  [self measureBlock:^{
+    for (int i = 0; i < 500; ++i) {
+      dispatch_group_t group = dispatch_group_create();
+
+      dispatch_group_async(group, concurrentQueue, ^{
+        [TestAllTypes parseFromData:allTypesData error:NULL];
+      });
+
+      dispatch_group_async(group, concurrentQueue, ^{
+        [TestAllTypes parseFromData:allTypesData error:NULL];
+      });
+
+      dispatch_group_notify(group, concurrentQueue, ^{});
+
+      dispatch_release(group);
+    }
+  }];
+
+  dispatch_release(concurrentQueue);
+}
+
+- (void)testMessageSerialExtensionsParsingPerformance {
+  // This and the next test are meant to monitor that the parsing functionality of protos does not
+  // lock across threads when parsing different instances when using extensions. The Serial version
+  // of the test should run around ~2 times slower than the Parallel version since it's parsing the
+  // protos in the same thread.
+  TestAllExtensions *allExtensionsMessage = [TestAllExtensions message];
+  [self setAllExtensions:allExtensionsMessage repeatedCount:2];
+  NSData *allExtensionsData = allExtensionsMessage.data;
+
+  [self measureBlock:^{
+    for (int i = 0; i < 500; ++i) {
+      [TestAllExtensions parseFromData:allExtensionsData
+                     extensionRegistry:[self extensionRegistry]
+                                 error:NULL];
+      [TestAllExtensions parseFromData:allExtensionsData
+                     extensionRegistry:[self extensionRegistry]
+                                 error:NULL];
+    }
+  }];
+}
+
+- (void)testMessageParallelExtensionsParsingPerformance {
+  // This and the previous test are meant to monitor that the parsing functionality of protos does
+  // not lock across threads when parsing different instances when using extensions. The Serial
+  // version of the test should run around ~2 times slower than the Parallel version since it's
+  // parsing the protos in the same thread.
+  TestAllExtensions *allExtensionsMessage = [TestAllExtensions message];
+  [self setAllExtensions:allExtensionsMessage repeatedCount:2];
+  NSData *allExtensionsData = allExtensionsMessage.data;
+
+  dispatch_queue_t concurrentQueue = dispatch_queue_create("perfQueue", DISPATCH_QUEUE_CONCURRENT);
+
+  [self measureBlock:^{
+    for (int i = 0; i < 500; ++i) {
+      dispatch_group_t group = dispatch_group_create();
+
+      dispatch_group_async(group, concurrentQueue, ^{
+        [TestAllExtensions parseFromData:allExtensionsData
+                       extensionRegistry:[UnittestRoot extensionRegistry]
+                                   error:NULL];
+      });
+
+      dispatch_group_async(group, concurrentQueue, ^{
+        [TestAllExtensions parseFromData:allExtensionsData
+                       extensionRegistry:[UnittestRoot extensionRegistry]
+                                   error:NULL];
+      });
+
+      dispatch_group_notify(group, concurrentQueue, ^{});
+
+      dispatch_release(group);
+    }
+  }];
+
+  dispatch_release(concurrentQueue);
+}
+
 - (void)testExtensionsPerformance {
   [self measureBlock:^{
     for (int i = 0; i < 200; ++i) {
diff --git a/objectivec/Tests/GPBTestUtilities.h b/objectivec/Tests/GPBTestUtilities.h
index 44c80844..780184b0 100644
--- a/objectivec/Tests/GPBTestUtilities.h
+++ b/objectivec/Tests/GPBTestUtilities.h
@@ -39,6 +39,9 @@
 @class TestUnpackedExtensions;
 @class GPBExtensionRegistry;
 
+static inline NSData *DataFromCStr(const char *str) {
+  return [NSData dataWithBytes:str length:strlen(str)];
+}
 
 // Helper for uses of C arrays in tests cases.
 #ifndef GPBARRAYSIZE
diff --git a/objectivec/Tests/GPBUnknownFieldSetTest.m b/objectivec/Tests/GPBUnknownFieldSetTest.m
index b2b5b21e..8e03a427 100644
--- a/objectivec/Tests/GPBUnknownFieldSetTest.m
+++ b/objectivec/Tests/GPBUnknownFieldSetTest.m
@@ -60,6 +60,95 @@
   unknownFields_ = emptyMessage_.unknownFields;
 }
 
+- (void)testInvalidFieldNumber {
+  GPBUnknownFieldSet *set = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* field = [[[GPBUnknownField alloc] initWithNumber:0] autorelease];
+  XCTAssertThrowsSpecificNamed([set addField:field], NSException, NSInvalidArgumentException);
+}
+
+- (void)testEqualityAndHash {
+  // Empty
+
+  GPBUnknownFieldSet *set1 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  XCTAssertTrue([set1 isEqual:set1]);
+  XCTAssertFalse([set1 isEqual:@"foo"]);
+  GPBUnknownFieldSet *set2 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // Varint
+
+  GPBUnknownField* field1 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
+  [field1 addVarint:1];
+  [set1 addField:field1];
+  XCTAssertNotEqualObjects(set1, set2);
+  GPBUnknownField* field2 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
+  [field2 addVarint:1];
+  [set2 addField:field2];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // Fixed32
+
+  field1 = [[[GPBUnknownField alloc] initWithNumber:2] autorelease];
+  [field1 addFixed32:2];
+  [set1 addField:field1];
+  XCTAssertNotEqualObjects(set1, set2);
+  field2 = [[[GPBUnknownField alloc] initWithNumber:2] autorelease];
+  [field2 addFixed32:2];
+  [set2 addField:field2];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // Fixed64
+
+  field1 = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
+  [field1 addFixed64:3];
+  [set1 addField:field1];
+  XCTAssertNotEqualObjects(set1, set2);
+  field2 = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
+  [field2 addFixed64:3];
+  [set2 addField:field2];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // LengthDelimited
+
+  field1 = [[[GPBUnknownField alloc] initWithNumber:4] autorelease];
+  [field1 addLengthDelimited:DataFromCStr("foo")];
+  [set1 addField:field1];
+  XCTAssertNotEqualObjects(set1, set2);
+  field2 = [[[GPBUnknownField alloc] initWithNumber:4] autorelease];
+  [field2 addLengthDelimited:DataFromCStr("foo")];
+  [set2 addField:field2];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // Group
+
+  GPBUnknownFieldSet *group1 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup1 = [[[GPBUnknownField alloc] initWithNumber:10] autorelease];
+  [fieldGroup1 addVarint:1];
+  [group1 addField:fieldGroup1];
+  GPBUnknownFieldSet *group2 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup2 = [[[GPBUnknownField alloc] initWithNumber:10] autorelease];
+  [fieldGroup2 addVarint:1];
+  [group2 addField:fieldGroup2];
+
+  field1 = [[[GPBUnknownField alloc] initWithNumber:5] autorelease];
+  [field1 addGroup:group1];
+  [set1 addField:field1];
+  XCTAssertNotEqualObjects(set1, set2);
+  field2 = [[[GPBUnknownField alloc] initWithNumber:5] autorelease];
+  [field2 addGroup:group2];
+  [set2 addField:field2];
+  XCTAssertEqualObjects(set1, set2);
+  XCTAssertEqual([set1 hash], [set2 hash]);
+
+  // Exercise description for completeness.
+  XCTAssertTrue(set1.description.length > 10);
+}
+
 // Constructs a protocol buffer which contains fields with all the same
 // numbers as allFieldsData except that each field is some other wire
 // type.
@@ -112,6 +201,24 @@
   field = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
   [field addVarint:4];
   [set1 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:4] autorelease];
+  [field addFixed32:6];
+  [set1 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:5] autorelease];
+  [field addFixed64:20];
+  [set1 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:10] autorelease];
+  [field addLengthDelimited:DataFromCStr("data1")];
+  [set1 addField:field];
+
+  GPBUnknownFieldSet *group1 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup1 = [[[GPBUnknownField alloc] initWithNumber:200] autorelease];
+  [fieldGroup1 addVarint:100];
+  [group1 addField:fieldGroup1];
+
+  field = [[[GPBUnknownField alloc] initWithNumber:11] autorelease];
+  [field addGroup:group1];
+  [set1 addField:field];
 
   GPBUnknownFieldSet* set2 = [[[GPBUnknownFieldSet alloc] init] autorelease];
   field = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
@@ -120,22 +227,63 @@
   field = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
   [field addVarint:3];
   [set2 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:4] autorelease];
+  [field addFixed32:7];
+  [set2 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:5] autorelease];
+  [field addFixed64:30];
+  [set2 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:10] autorelease];
+  [field addLengthDelimited:DataFromCStr("data2")];
+  [set2 addField:field];
+
+  GPBUnknownFieldSet *group2 = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup2 = [[[GPBUnknownField alloc] initWithNumber:201] autorelease];
+  [fieldGroup2 addVarint:99];
+  [group2 addField:fieldGroup2];
+
+  field = [[[GPBUnknownField alloc] initWithNumber:11] autorelease];
+  [field addGroup:group2];
+  [set2 addField:field];
 
   GPBUnknownFieldSet* set3 = [[[GPBUnknownFieldSet alloc] init] autorelease];
   field = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
   [field addVarint:1];
   [set3 addField:field];
-  field = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
-  [field addVarint:4];
-  [set3 addField:field];
-
-  GPBUnknownFieldSet* set4 = [[[GPBUnknownFieldSet alloc] init] autorelease];
   field = [[[GPBUnknownField alloc] initWithNumber:2] autorelease];
   [field addVarint:2];
-  [set4 addField:field];
+  [set3 addField:field];
   field = [[[GPBUnknownField alloc] initWithNumber:3] autorelease];
+  [field addVarint:4];
+  [set3 addField:field];
   [field addVarint:3];
-  [set4 addField:field];
+  [set3 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:4] autorelease];
+  [field addFixed32:6];
+  [field addFixed32:7];
+  [set3 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:5] autorelease];
+  [field addFixed64:20];
+  [field addFixed64:30];
+  [set3 addField:field];
+  field = [[[GPBUnknownField alloc] initWithNumber:10] autorelease];
+  [field addLengthDelimited:DataFromCStr("data1")];
+  [field addLengthDelimited:DataFromCStr("data2")];
+  [set3 addField:field];
+
+  GPBUnknownFieldSet *group3a = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup3a1 = [[[GPBUnknownField alloc] initWithNumber:200] autorelease];
+  [fieldGroup3a1 addVarint:100];
+  [group3a addField:fieldGroup3a1];
+  GPBUnknownFieldSet *group3b = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup3b2 = [[[GPBUnknownField alloc] initWithNumber:201] autorelease];
+  [fieldGroup3b2 addVarint:99];
+  [group3b addField:fieldGroup3b2];
+
+  field = [[[GPBUnknownField alloc] initWithNumber:11] autorelease];
+  [field addGroup:group1];
+  [field addGroup:group3b];
+  [set3 addField:field];
 
   TestEmptyMessage* source1 = [TestEmptyMessage message];
   [source1 setUnknownFields:set1];
@@ -143,8 +291,6 @@
   [source2 setUnknownFields:set2];
   TestEmptyMessage* source3 = [TestEmptyMessage message];
   [source3 setUnknownFields:set3];
-  TestEmptyMessage* source4 = [TestEmptyMessage message];
-  [source4 setUnknownFields:set4];
 
   TestEmptyMessage* destination1 = [TestEmptyMessage message];
   [destination1 mergeFrom:source1];
@@ -152,9 +298,10 @@
 
   TestEmptyMessage* destination2 = [TestEmptyMessage message];
   [destination2 mergeFrom:source3];
-  [destination2 mergeFrom:source4];
 
   XCTAssertEqualObjects(destination1.data, destination2.data);
+  XCTAssertEqualObjects(destination1.data, source3.data);
+  XCTAssertEqualObjects(destination2.data, source3.data);
 }
 
 - (void)testClearMessage {
@@ -240,6 +387,107 @@
   XCTAssertEqual(0x7FFFFFFFFFFFFFFFULL, [field2.varintList valueAtIndex:0]);
 }
 
+#pragma mark - Field tests
+// Some tests directly on fields since the dictionary in FieldSet can gate
+// testing some of these.
+
+- (void)testFieldEqualityAndHash {
+  GPBUnknownField* field1 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
+  XCTAssertTrue([field1 isEqual:field1]);
+  XCTAssertFalse([field1 isEqual:@"foo"]);
+  GPBUnknownField* field2 = [[[GPBUnknownField alloc] initWithNumber:2] autorelease];
+  XCTAssertNotEqualObjects(field1, field2);
+
+  field2 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // Varint
+
+  [field1 addVarint:10];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addVarint:10];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+  [field1 addVarint:11];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addVarint:11];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // Fixed32
+
+  [field1 addFixed32:20];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addFixed32:20];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+  [field1 addFixed32:21];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addFixed32:21];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // Fixed64
+
+  [field1 addFixed64:30];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addFixed64:30];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+  [field1 addFixed64:31];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addFixed64:31];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // LengthDelimited
+
+  [field1 addLengthDelimited:DataFromCStr("foo")];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addLengthDelimited:DataFromCStr("foo")];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+  [field1 addLengthDelimited:DataFromCStr("bar")];
+  XCTAssertNotEqualObjects(field1, field2);
+  [field2 addLengthDelimited:DataFromCStr("bar")];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // Group
+
+  GPBUnknownFieldSet *group = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  GPBUnknownField* fieldGroup = [[[GPBUnknownField alloc] initWithNumber:100] autorelease];
+  [fieldGroup addVarint:100];
+  [group addField:fieldGroup];
+  [field1 addGroup:group];
+  XCTAssertNotEqualObjects(field1, field2);
+  group = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  fieldGroup = [[[GPBUnknownField alloc] initWithNumber:100] autorelease];
+  [fieldGroup addVarint:100];
+  [group addField:fieldGroup];
+  [field2 addGroup:group];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  group = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  fieldGroup = [[[GPBUnknownField alloc] initWithNumber:101] autorelease];
+  [fieldGroup addVarint:101];
+  [group addField:fieldGroup];
+  [field1 addGroup:group];
+  XCTAssertNotEqualObjects(field1, field2);
+  group = [[[GPBUnknownFieldSet alloc] init] autorelease];
+  fieldGroup = [[[GPBUnknownField alloc] initWithNumber:101] autorelease];
+  [fieldGroup addVarint:101];
+  [group addField:fieldGroup];
+  [field2 addGroup:group];
+  XCTAssertEqualObjects(field1, field2);
+  XCTAssertEqual([field1 hash], [field2 hash]);
+
+  // Exercise description for completeness.
+  XCTAssertTrue(field1.description.length > 10);
+}
+
 - (void)testMergingFields {
   GPBUnknownField* field1 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
   [field1 addVarint:1];
@@ -247,9 +495,8 @@
   [field1 addFixed64:3];
   [field1 addLengthDelimited:[NSData dataWithBytes:"hello" length:5]];
   [field1 addGroup:[[unknownFields_ copy] autorelease]];
-  GPBUnknownField* field2 = [[[GPBUnknownField alloc] initWithNumber:2] autorelease];
+  GPBUnknownField* field2 = [[[GPBUnknownField alloc] initWithNumber:1] autorelease];
   [field2 mergeFromField:field1];
-  XCTAssertEqualObjects(field1, field2);
 }
 
 @end
diff --git a/objectivec/Tests/GPBUtilitiesTests.m b/objectivec/Tests/GPBUtilitiesTests.m
index 2e206a54..8a8ba93e 100644
--- a/objectivec/Tests/GPBUtilitiesTests.m
+++ b/objectivec/Tests/GPBUtilitiesTests.m
@@ -52,12 +52,12 @@
 
 - (void)testRightShiftFunctions {
   XCTAssertEqual((1UL << 31) >> 31, 1UL);
-  XCTAssertEqual((1 << 31) >> 31, -1);
+  XCTAssertEqual((int32_t)(1U << 31) >> 31, -1);
   XCTAssertEqual((1ULL << 63) >> 63, 1ULL);
-  XCTAssertEqual((1LL << 63) >> 63, -1LL);
+  XCTAssertEqual((int64_t)(1ULL << 63) >> 63, -1LL);
 
-  XCTAssertEqual(GPBLogicalRightShift32((1 << 31), 31), 1);
-  XCTAssertEqual(GPBLogicalRightShift64((1LL << 63), 63), 1LL);
+  XCTAssertEqual(GPBLogicalRightShift32((1U << 31), 31), 1);
+  XCTAssertEqual(GPBLogicalRightShift64((1ULL << 63), 63), 1LL);
 }
 
 - (void)testGPBDecodeTextFormatName {
diff --git a/objectivec/Tests/iOSTestHarness/AppDelegate.m b/objectivec/Tests/iOSTestHarness/AppDelegate.m
deleted file mode 100644
index 8c4a586b..00000000
--- a/objectivec/Tests/iOSTestHarness/AppDelegate.m
+++ /dev/null
@@ -1,35 +0,0 @@
-#import <UIKit/UIKit.h>
-
-@interface AppDelegate : UIResponder <UIApplicationDelegate>
-@property (strong, nonatomic) UIWindow *window;
-@end
-
-@implementation AppDelegate
-
-@synthesize window;
-
-- (BOOL)application:(UIApplication *)application
-    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-  #pragma unused (application, launchOptions)
-
-  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
-  self.window.backgroundColor = [UIColor whiteColor];
-  [self.window makeKeyAndVisible];
-  self.window.rootViewController = [[UIViewController alloc] init];
-
-  UILabel *label =
-      [[UILabel alloc] initWithFrame:CGRectMake(0, 200, CGRectGetWidth(self.window.frame), 40)];
-  label.text = @"Protocol Buffer Test Harness";
-  label.textAlignment = NSTextAlignmentCenter;
-  [self.window addSubview:label];
-
-  return YES;
-}
-
-@end
-
-int main(int argc, char * argv[]) {
-  @autoreleasepool {
-    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
-  }
-}
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/Contents.json b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/Contents.json
deleted file mode 100644
index 0cbf9acc..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/Contents.json
+++ /dev/null
@@ -1,116 +0,0 @@
-{
-  "images" : [
-    {
-      "idiom" : "iphone",
-      "size" : "29x29",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "iphone",
-      "size" : "29x29",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "iphone",
-      "size" : "29x29",
-      "scale" : "3x"
-    },
-    {
-      "idiom" : "iphone",
-      "size" : "40x40",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "iphone",
-      "size" : "40x40",
-      "scale" : "3x"
-    },
-    {
-      "size" : "57x57",
-      "idiom" : "iphone",
-      "filename" : "iPhone6.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "57x57",
-      "idiom" : "iphone",
-      "filename" : "iPhone6_2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "60x60",
-      "idiom" : "iphone",
-      "filename" : "iPhone7_2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "60x60",
-      "idiom" : "iphone",
-      "filename" : "iPhone7_3x.png",
-      "scale" : "3x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "29x29",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "29x29",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "40x40",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "40x40",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "50x50",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "ipad",
-      "size" : "50x50",
-      "scale" : "2x"
-    },
-    {
-      "size" : "72x72",
-      "idiom" : "ipad",
-      "filename" : "iPad6.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "72x72",
-      "idiom" : "ipad",
-      "filename" : "iPad6_2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "76x76",
-      "idiom" : "ipad",
-      "filename" : "iPad7.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "76x76",
-      "idiom" : "ipad",
-      "filename" : "iPad7_2x.png",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "car",
-      "size" : "120x120",
-      "scale" : "1x"
-    }
-  ],
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6.png
deleted file mode 100644
index 43da2ee4..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6_2x.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6_2x.png
deleted file mode 100644
index 2ec93704..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad6_2x.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7.png
deleted file mode 100644
index aec8bc1b..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7_2x.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7_2x.png
deleted file mode 100644
index e39cc3e7..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPad7_2x.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6.png
deleted file mode 100644
index 5572d79f..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6_2x.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6_2x.png
deleted file mode 100644
index 2424997f..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone6_2x.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_2x.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_2x.png
deleted file mode 100644
index 10bfc3cf..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_2x.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_3x.png b/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_3x.png
deleted file mode 100644
index 8d16f14d..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/AppIcon.appiconset/iPhone7_3x.png
+++ /dev/null
diff --git a/objectivec/Tests/iOSTestHarness/Images.xcassets/LaunchImage.launchimage/Contents.json b/objectivec/Tests/iOSTestHarness/Images.xcassets/LaunchImage.launchimage/Contents.json
deleted file mode 100644
index 5a296668..00000000
--- a/objectivec/Tests/iOSTestHarness/Images.xcassets/LaunchImage.launchimage/Contents.json
+++ /dev/null
@@ -1,49 +0,0 @@
-{
-  "images" : [
-    {
-      "orientation" : "portrait",
-      "idiom" : "ipad",
-      "minimum-system-version" : "7.0",
-      "extent" : "full-screen",
-      "scale" : "2x"
-    },
-    {
-      "orientation" : "landscape",
-      "idiom" : "ipad",
-      "minimum-system-version" : "7.0",
-      "extent" : "full-screen",
-      "scale" : "1x"
-    },
-    {
-      "orientation" : "landscape",
-      "idiom" : "ipad",
-      "minimum-system-version" : "7.0",
-      "extent" : "full-screen",
-      "scale" : "2x"
-    },
-    {
-      "orientation" : "portrait",
-      "idiom" : "iphone",
-      "minimum-system-version" : "7.0",
-      "scale" : "2x"
-    },
-    {
-      "orientation" : "portrait",
-      "idiom" : "iphone",
-      "minimum-system-version" : "7.0",
-      "subtype" : "retina4",
-      "scale" : "2x"
-    },
-    {
-      "orientation" : "portrait",
-      "idiom" : "ipad",
-      "minimum-system-version" : "7.0",
-      "extent" : "full-screen",
-      "scale" : "1x"
-    }
-  ],
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}
\ No newline at end of file
diff --git a/objectivec/Tests/iOSTestHarness/Info.plist b/objectivec/Tests/iOSTestHarness/Info.plist
deleted file mode 100644
index 24bd333d..00000000
--- a/objectivec/Tests/iOSTestHarness/Info.plist
+++ /dev/null
@@ -1,43 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>en</string>
-	<key>CFBundleDisplayName</key>
-	<string>${PRODUCT_NAME}</string>
-	<key>CFBundleExecutable</key>
-	<string>${EXECUTABLE_NAME}</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>${PRODUCT_NAME}</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleSignature</key>
-	<string>????</string>
-	<key>CFBundleVersion</key>
-	<string>1.0</string>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>UILaunchStoryboardName</key>
-	<string>LaunchScreen</string>
-	<key>UISupportedInterfaceOrientations</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-		<string>UIInterfaceOrientationPortraitUpsideDown</string>
-	</array>
-</dict>
-</plist>
diff --git a/objectivec/Tests/iOSTestHarness/LaunchScreen.xib b/objectivec/Tests/iOSTestHarness/LaunchScreen.xib
deleted file mode 100644
index 22204bfe..00000000
--- a/objectivec/Tests/iOSTestHarness/LaunchScreen.xib
+++ /dev/null
@@ -1,33 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6254" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
-    <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>
-        <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
-    </dependencies>
-    <objects>
-        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
-        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
-        <view contentMode="scaleToFill" id="iN0-l3-epB">
-            <rect key="frame" x="0.0" y="0.0" width="630" height="503"/>
-            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-            <subviews>
-                <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Protocol Buffer Test Harness" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
-                    <rect key="frame" x="20" y="147" width="591" height="43"/>
-                    <fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
-                    <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
-                    <nil key="highlightedColor"/>
-                </label>
-            </subviews>
-            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
-            <constraints>
-                <constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="Kid-kn-2rF"/>
-                <constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
-                <constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
-            </constraints>
-            <nil key="simulatedStatusBarMetrics"/>
-            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
-            <point key="canvasLocation" x="479" y="456.5"/>
-        </view>
-    </objects>
-</document>
diff --git a/objectivec/Tests/iOSTestHarness/en.lproj/InfoPlist.strings b/objectivec/Tests/iOSTestHarness/en.lproj/InfoPlist.strings
deleted file mode 100644
index 477b28ff..00000000
--- a/objectivec/Tests/iOSTestHarness/en.lproj/InfoPlist.strings
+++ /dev/null
@@ -1,2 +0,0 @@
-/* Localized versions of Info.plist keys */
-
diff --git a/objectivec/Tests/unittest_objc.proto b/objectivec/Tests/unittest_objc.proto
index e5577faf..b0eb4723 100644
--- a/objectivec/Tests/unittest_objc.proto
+++ b/objectivec/Tests/unittest_objc.proto
@@ -58,6 +58,27 @@ message TestRecursiveMessageWithRepeatedField {
   map<string, string> str_to_str = 5;
 }
 
+// Message with a few types of maps to cover the different custom flows
+// in the runtime.
+message TestMessageOfMaps {
+  map<string, string> str_to_str = 1;
+
+  map<string, int32> str_to_int = 2;
+  map<int32, string> int_to_str = 3;
+  map<int32, int32> int_to_int = 4;
+
+  map<string, bool> str_to_bool = 5;
+  map<bool, string> bool_to_str = 6;
+  map<bool, bool> bool_to_bool = 7;
+
+  map<int32, bool> int_to_bool = 8;
+  map<bool, int32> bool_to_int = 9;
+
+  map<string, TestAllTypes> str_to_msg = 10;
+  map<int32, TestAllTypes> int_to_msg = 11;
+  map<bool, TestAllTypes> bool_to_msg = 12;
+}
+
 // Recursive message and extension to for testing autocreators at different
 // depths.
 message TestRecursiveExtension {
diff --git a/objectivec/google/protobuf/Any.pbobjc.h b/objectivec/google/protobuf/Any.pbobjc.h
index d236e4b2..ad261898 100644
--- a/objectivec/google/protobuf/Any.pbobjc.h
+++ b/objectivec/google/protobuf/Any.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
@@ -87,6 +91,16 @@ typedef GPB_ENUM(GPBAny_FieldNumber) {
  *       any.Unpack(foo)
  *       ...
  *
+ *  Example 4: Pack and unpack a message in Go
+ *
+ *      foo := &pb.Foo{...}
+ *      any, err := ptypes.MarshalAny(foo)
+ *      ...
+ *      foo := &pb.Foo{}
+ *      if err := ptypes.UnmarshalAny(any, foo); err != nil {
+ *        ...
+ *      }
+ *
  * The pack methods provided by protobuf library will by default use
  * 'type.googleapis.com/full.type.name' as the type URL and the unpack
  * methods only use the fully qualified type name after the last '/'
@@ -125,17 +139,18 @@ typedef GPB_ENUM(GPBAny_FieldNumber) {
 @interface GPBAny : GPBMessage
 
 /**
- * A URL/resource name whose content describes the type of the
- * serialized protocol buffer message.
+ * A URL/resource name that uniquely identifies the type of the serialized
+ * protocol buffer message. The last segment of the URL's path must represent
+ * the fully qualified name of the type (as in
+ * `path/google.protobuf.Duration`). The name should be in a canonical form
+ * (e.g., leading "." is not accepted).
  *
- * For URLs which use the scheme `http`, `https`, or no scheme, the
- * following restrictions and interpretations apply:
+ * In practice, teams usually precompile into the binary all types that they
+ * expect it to use in the context of Any. However, for URLs which use the
+ * scheme `http`, `https`, or no scheme, one can optionally set up a type
+ * server that maps type URLs to message definitions as follows:
  *
  * * If no scheme is provided, `https` is assumed.
- * * The last segment of the URL's path must represent the fully
- *   qualified name of the type (as in `path/google.protobuf.Duration`).
- *   The name should be in a canonical form (e.g., leading "." is
- *   not accepted).
  * * An HTTP GET on the URL must yield a [google.protobuf.Type][]
  *   value in binary format, or produce an error.
  * * Applications are allowed to cache lookup results based on the
@@ -144,6 +159,10 @@ typedef GPB_ENUM(GPBAny_FieldNumber) {
  *   on changes to types. (Use versioned type names to manage
  *   breaking changes.)
  *
+ * Note: this functionality is not currently available in the official
+ * protobuf release, and it is not used for type URLs beginning with
+ * type.googleapis.com.
+ *
  * Schemes other than `http`, `https` (or the empty scheme) might be
  * used with implementation specific semantics.
  **/
diff --git a/objectivec/google/protobuf/Api.pbobjc.h b/objectivec/google/protobuf/Api.pbobjc.h
index 742a8122..c93f3f15 100644
--- a/objectivec/google/protobuf/Api.pbobjc.h
+++ b/objectivec/google/protobuf/Api.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
@@ -63,34 +67,41 @@ typedef GPB_ENUM(GPBApi_FieldNumber) {
 };
 
 /**
- * Api is a light-weight descriptor for a protocol buffer service.
+ * Api is a light-weight descriptor for an API Interface.
+ *
+ * Interfaces are also described as "protocol buffer services" in some contexts,
+ * such as by the "service" keyword in a .proto file, but they are different
+ * from API Services, which represent a concrete implementation of an interface
+ * as opposed to simply a description of methods and bindings. They are also
+ * sometimes simply referred to as "APIs" in other contexts, such as the name of
+ * this message itself. See https://cloud.google.com/apis/design/glossary for
+ * detailed terminology.
  **/
 @interface GPBApi : GPBMessage
 
 /**
- * The fully qualified name of this api, including package name
- * followed by the api's simple name.
+ * The fully qualified name of this interface, including package name
+ * followed by the interface's simple name.
  **/
 @property(nonatomic, readwrite, copy, null_resettable) NSString *name;
 
-/** The methods of this api, in unspecified order. */
+/** The methods of this interface, in unspecified order. */
 @property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBMethod*> *methodsArray;
 /** The number of items in @c methodsArray without causing the array to be created. */
 @property(nonatomic, readonly) NSUInteger methodsArray_Count;
 
-/** Any metadata attached to the API. */
+/** Any metadata attached to the interface. */
 @property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBOption*> *optionsArray;
 /** The number of items in @c optionsArray without causing the array to be created. */
 @property(nonatomic, readonly) NSUInteger optionsArray_Count;
 
 /**
- * A version string for this api. If specified, must have the form
- * `major-version.minor-version`, as in `1.10`. If the minor version
- * is omitted, it defaults to zero. If the entire version field is
- * empty, the major version is derived from the package name, as
- * outlined below. If the field is not empty, the version in the
- * package name will be verified to be consistent with what is
- * provided here.
+ * A version string for this interface. If specified, must have the form
+ * `major-version.minor-version`, as in `1.10`. If the minor version is
+ * omitted, it defaults to zero. If the entire version field is empty, the
+ * major version is derived from the package name, as outlined below. If the
+ * field is not empty, the version in the package name will be verified to be
+ * consistent with what is provided here.
  *
  * The versioning schema uses [semantic
  * versioning](http://semver.org) where the major version number
@@ -100,10 +111,10 @@ typedef GPB_ENUM(GPBApi_FieldNumber) {
  * chosen based on the product plan.
  *
  * The major version is also reflected in the package name of the
- * API, which must end in `v<major-version>`, as in
+ * interface, which must end in `v<major-version>`, as in
  * `google.feature.v1`. For major versions 0 and 1, the suffix can
  * be omitted. Zero major versions must only be used for
- * experimental, none-GA apis.
+ * experimental, non-GA interfaces.
  **/
 @property(nonatomic, readwrite, copy, null_resettable) NSString *version;
 
@@ -115,7 +126,7 @@ typedef GPB_ENUM(GPBApi_FieldNumber) {
 /** Test to see if @c sourceContext has been set. */
 @property(nonatomic, readwrite) BOOL hasSourceContext;
 
-/** Included APIs. See [Mixin][]. */
+/** Included interfaces. See [Mixin][]. */
 @property(nonatomic, readwrite, strong, null_resettable) NSMutableArray<GPBMixin*> *mixinsArray;
 /** The number of items in @c mixinsArray without causing the array to be created. */
 @property(nonatomic, readonly) NSUInteger mixinsArray_Count;
@@ -150,7 +161,7 @@ typedef GPB_ENUM(GPBMethod_FieldNumber) {
 };
 
 /**
- * Method represents a method of an api.
+ * Method represents a method of an API interface.
  **/
 @interface GPBMethod : GPBMessage
 
@@ -199,9 +210,9 @@ typedef GPB_ENUM(GPBMixin_FieldNumber) {
 };
 
 /**
- * Declares an API to be included in this API. The including API must
- * redeclare all the methods from the included API, but documentation
- * and options are inherited as follows:
+ * Declares an API Interface to be included in this interface. The including
+ * interface must redeclare all the methods from the included interface, but
+ * documentation and options are inherited as follows:
  *
  * - If after comment and whitespace stripping, the documentation
  *   string of the redeclared method is empty, it will be inherited
@@ -213,7 +224,8 @@ typedef GPB_ENUM(GPBMixin_FieldNumber) {
  *
  * - If an http annotation is inherited, the path pattern will be
  *   modified as follows. Any version prefix will be replaced by the
- *   version of the including API plus the [root][] path if specified.
+ *   version of the including interface plus the [root][] path if
+ *   specified.
  *
  * Example of a simple mixin:
  *
@@ -279,7 +291,7 @@ typedef GPB_ENUM(GPBMixin_FieldNumber) {
  **/
 @interface GPBMixin : GPBMessage
 
-/** The fully qualified name of the API which is included. */
+/** The fully qualified name of the interface which is included. */
 @property(nonatomic, readwrite, copy, null_resettable) NSString *name;
 
 /**
diff --git a/objectivec/google/protobuf/Duration.pbobjc.h b/objectivec/google/protobuf/Duration.pbobjc.h
index e70138a0..3e367590 100644
--- a/objectivec/google/protobuf/Duration.pbobjc.h
+++ b/objectivec/google/protobuf/Duration.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
@@ -59,6 +63,8 @@ typedef GPB_ENUM(GPBDuration_FieldNumber) {
  * two Timestamp values is a Duration and it can be added or subtracted
  * from a Timestamp. Range is approximately +-10,000 years.
  *
+ * # Examples
+ *
  * Example 1: Compute Duration from two Timestamps in pseudo code.
  *
  *     Timestamp start = ...;
@@ -98,12 +104,23 @@ typedef GPB_ENUM(GPBDuration_FieldNumber) {
  *     td = datetime.timedelta(days=3, minutes=10)
  *     duration = Duration()
  *     duration.FromTimedelta(td)
+ *
+ * # JSON Mapping
+ *
+ * In JSON format, the Duration type is encoded as a string rather than an
+ * object, where the string ends in the suffix "s" (indicating seconds) and
+ * is preceded by the number of seconds, with nanoseconds expressed as
+ * fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+ * encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+ * be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+ * microsecond should be expressed in JSON format as "3.000001s".
  **/
 @interface GPBDuration : GPBMessage
 
 /**
  * Signed seconds of the span of time. Must be from -315,576,000,000
- * to +315,576,000,000 inclusive.
+ * to +315,576,000,000 inclusive. Note: these bounds are computed from:
+ * 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
  **/
 @property(nonatomic, readwrite) int64_t seconds;
 
diff --git a/objectivec/google/protobuf/Empty.pbobjc.h b/objectivec/google/protobuf/Empty.pbobjc.h
index bd49cfdb..fdc247ae 100644
--- a/objectivec/google/protobuf/Empty.pbobjc.h
+++ b/objectivec/google/protobuf/Empty.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
diff --git a/objectivec/google/protobuf/FieldMask.pbobjc.h b/objectivec/google/protobuf/FieldMask.pbobjc.h
index 07e60818..73296d57 100644
--- a/objectivec/google/protobuf/FieldMask.pbobjc.h
+++ b/objectivec/google/protobuf/FieldMask.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
@@ -252,6 +256,12 @@ typedef GPB_ENUM(GPBFieldMask_FieldNumber) {
  *
  * Note that oneof type names ("test_oneof" in this case) cannot be used in
  * paths.
+ *
+ * ## Field Mask Verification
+ *
+ * The implementation of any API method which has a FieldMask type field in the
+ * request should verify the included field paths, and return an
+ * `INVALID_ARGUMENT` error if any path is duplicated or unmappable.
  **/
 @interface GPBFieldMask : GPBMessage
 
diff --git a/objectivec/google/protobuf/SourceContext.pbobjc.h b/objectivec/google/protobuf/SourceContext.pbobjc.h
index 799d190a..e4923959 100644
--- a/objectivec/google/protobuf/SourceContext.pbobjc.h
+++ b/objectivec/google/protobuf/SourceContext.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
diff --git a/objectivec/google/protobuf/Struct.pbobjc.h b/objectivec/google/protobuf/Struct.pbobjc.h
index 3fc80caa..fb204251 100644
--- a/objectivec/google/protobuf/Struct.pbobjc.h
+++ b/objectivec/google/protobuf/Struct.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
diff --git a/objectivec/google/protobuf/Struct.pbobjc.m b/objectivec/google/protobuf/Struct.pbobjc.m
index f36ec582..816fd6df 100644
--- a/objectivec/google/protobuf/Struct.pbobjc.m
+++ b/objectivec/google/protobuf/Struct.pbobjc.m
@@ -13,6 +13,8 @@
  #import "GPBProtocolBuffers_RuntimeSupport.h"
 #endif
 
+#import <stdatomic.h>
+
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
  #import <Protobuf/Struct.pbobjc.h>
 #else
@@ -51,7 +53,7 @@ static GPBFileDescriptor *GPBStructRoot_FileDescriptor(void) {
 #pragma mark - Enum GPBNullValue
 
 GPBEnumDescriptor *GPBNullValue_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = nil;
   if (!descriptor) {
     static const char *valueNames =
         "NullValue\000";
@@ -64,7 +66,8 @@ GPBEnumDescriptor *GPBNullValue_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBNullValue_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
diff --git a/objectivec/google/protobuf/Timestamp.pbobjc.h b/objectivec/google/protobuf/Timestamp.pbobjc.h
index 9c83d094..2c4b8b20 100644
--- a/objectivec/google/protobuf/Timestamp.pbobjc.h
+++ b/objectivec/google/protobuf/Timestamp.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
@@ -64,6 +68,8 @@ typedef GPB_ENUM(GPBTimestamp_FieldNumber) {
  * and from  RFC 3339 date strings.
  * See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
  *
+ * # Examples
+ *
  * Example 1: Compute Timestamp from POSIX `time()`.
  *
  *     Timestamp timestamp;
@@ -103,6 +109,31 @@ typedef GPB_ENUM(GPBTimestamp_FieldNumber) {
  *
  *     timestamp = Timestamp()
  *     timestamp.GetCurrentTime()
+ *
+ * # JSON Mapping
+ *
+ * In JSON format, the Timestamp type is encoded as a string in the
+ * [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+ * format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+ * where {year} is always expressed using four digits while {month}, {day},
+ * {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+ * seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+ * are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+ * is required. A proto3 JSON serializer should always use UTC (as indicated by
+ * "Z") when printing the Timestamp type and a proto3 JSON parser should be
+ * able to accept both UTC and other timezones (as indicated by an offset).
+ *
+ * For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+ * 01:30 UTC on January 15, 2017.
+ *
+ * In JavaScript, one can convert a Date object to this format using the
+ * standard [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString]
+ * method. In Python, a standard `datetime.datetime` object can be converted
+ * to this format using [`strftime`](https://docs.python.org/2/library/time.html#time.strftime)
+ * with the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one
+ * can use the Joda Time's [`ISODateTimeFormat.dateTime()`](
+ * http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime--
+ * ) to obtain a formatter capable of generating timestamps in this format.
  **/
 @interface GPBTimestamp : GPBMessage
 
diff --git a/objectivec/google/protobuf/Type.pbobjc.h b/objectivec/google/protobuf/Type.pbobjc.h
index 17986970..e14d15df 100644
--- a/objectivec/google/protobuf/Type.pbobjc.h
+++ b/objectivec/google/protobuf/Type.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
diff --git a/objectivec/google/protobuf/Type.pbobjc.m b/objectivec/google/protobuf/Type.pbobjc.m
index 7a949388..bb64d876 100644
--- a/objectivec/google/protobuf/Type.pbobjc.m
+++ b/objectivec/google/protobuf/Type.pbobjc.m
@@ -13,6 +13,8 @@
  #import "GPBProtocolBuffers_RuntimeSupport.h"
 #endif
 
+#import <stdatomic.h>
+
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
  #import <Protobuf/Type.pbobjc.h>
  #import <Protobuf/Any.pbobjc.h>
@@ -54,7 +56,7 @@ static GPBFileDescriptor *GPBTypeRoot_FileDescriptor(void) {
 #pragma mark - Enum GPBSyntax
 
 GPBEnumDescriptor *GPBSyntax_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = nil;
   if (!descriptor) {
     static const char *valueNames =
         "SyntaxProto2\000SyntaxProto3\000";
@@ -68,7 +70,8 @@ GPBEnumDescriptor *GPBSyntax_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBSyntax_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
@@ -368,7 +371,7 @@ void SetGPBField_Cardinality_RawValue(GPBField *message, int32_t value) {
 #pragma mark - Enum GPBField_Kind
 
 GPBEnumDescriptor *GPBField_Kind_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = nil;
   if (!descriptor) {
     static const char *valueNames =
         "TypeUnknown\000TypeDouble\000TypeFloat\000TypeInt"
@@ -404,7 +407,8 @@ GPBEnumDescriptor *GPBField_Kind_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBField_Kind_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
@@ -441,7 +445,7 @@ BOOL GPBField_Kind_IsValidValue(int32_t value__) {
 #pragma mark - Enum GPBField_Cardinality
 
 GPBEnumDescriptor *GPBField_Cardinality_EnumDescriptor(void) {
-  static GPBEnumDescriptor *descriptor = NULL;
+  static _Atomic(GPBEnumDescriptor*) descriptor = nil;
   if (!descriptor) {
     static const char *valueNames =
         "CardinalityUnknown\000CardinalityOptional\000C"
@@ -458,7 +462,8 @@ GPBEnumDescriptor *GPBField_Cardinality_EnumDescriptor(void) {
                                            values:values
                                             count:(uint32_t)(sizeof(values) / sizeof(int32_t))
                                      enumVerifier:GPBField_Cardinality_IsValidValue];
-    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {
+    GPBEnumDescriptor *expected = nil;
+    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {
       [worker release];
     }
   }
diff --git a/objectivec/google/protobuf/Wrappers.pbobjc.h b/objectivec/google/protobuf/Wrappers.pbobjc.h
index 3cb9fe77..0411e1ec 100644
--- a/objectivec/google/protobuf/Wrappers.pbobjc.h
+++ b/objectivec/google/protobuf/Wrappers.pbobjc.h
@@ -8,9 +8,13 @@
 #endif
 
 #if GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS
- #import <Protobuf/GPBProtocolBuffers.h>
+ #import <Protobuf/GPBDescriptor.h>
+ #import <Protobuf/GPBMessage.h>
+ #import <Protobuf/GPBRootObject.h>
 #else
- #import "GPBProtocolBuffers.h"
+ #import "GPBDescriptor.h"
+ #import "GPBMessage.h"
+ #import "GPBRootObject.h"
 #endif
 
 #if GOOGLE_PROTOBUF_OBJC_VERSION < 30002
diff --git a/php/README.md b/php/README.md
index cebeb3e5..da7884ea 100644
--- a/php/README.md
+++ b/php/README.md
@@ -16,7 +16,7 @@ generation functionality.
 
 To use PHP runtime library requires:
 
-- C extension: PHP 5.5.x or 5.6.x.
+- C extension: PHP 5.5, 5.6, or 7.
 - PHP package: PHP 5.5, 5.6 or 7.
 
 ## Installation
diff --git a/php/composer.json b/php/composer.json
index 3dae2865..34e0447c 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -13,15 +13,9 @@
   },
   "autoload": {
     "psr-4": {
-      "Foo\\": "tests/generated/Foo",
-      "Bar\\": "tests/generated/Bar",
-      "Google\\Protobuf\\": "tests/generated/Google/Protobuf",
-      "Google\\Protobuf\\Internal\\": "src/Google/Protobuf/Internal",
-      "GPBMetadata\\": "tests/generated/GPBMetadata",
-      "GPBMetadata\\Google\\Protobuf\\Internal\\": "src/GPBMetadata/Google/Protobuf/Internal"
-    },
-    "files": [
-      "src/Google/Protobuf/descriptor.php"
-    ]
+      "Google\\Protobuf\\": "src/Google/Protobuf",
+      "GPBMetadata\\Google\\Protobuf\\": "src/GPBMetadata/Google/Protobuf",
+      "": "tests/generated"
+    }
   }
 }
diff --git a/php/ext/google/protobuf/array.c b/php/ext/google/protobuf/array.c
index 63bb6d0a..e69bef42 100644
--- a/php/ext/google/protobuf/array.c
+++ b/php/ext/google/protobuf/array.c
@@ -69,19 +69,20 @@ static zend_function_entry repeated_field_iter_methods[] = {
 
 // Forward declare static functions.
 
-static zend_object_value repeated_field_create(zend_class_entry *ce TSRMLS_DC);
-static void repeated_field_free(void *object TSRMLS_DC);
 static int repeated_field_array_init(zval *array, upb_fieldtype_t type,
                                      uint size ZEND_FILE_LINE_DC);
-static void repeated_field_free_element(void *object);
 static void repeated_field_write_dimension(zval *object, zval *offset,
                                            zval *value TSRMLS_DC);
 static int repeated_field_has_dimension(zval *object, zval *offset TSRMLS_DC);
-static HashTable *repeated_field_get_gc(zval *object, zval ***table,
+static HashTable *repeated_field_get_gc(zval *object, CACHED_VALUE **table,
                                         int *n TSRMLS_DC);
-
+#if PHP_MAJOR_VERSION < 7
+static zend_object_value repeated_field_create(zend_class_entry *ce TSRMLS_DC);
 static zend_object_value repeated_field_iter_create(zend_class_entry *ce TSRMLS_DC);
-static void repeated_field_iter_free(void *object TSRMLS_DC);
+#else
+static zend_object *repeated_field_create(zend_class_entry *ce TSRMLS_DC);
+static zend_object *repeated_field_iter_create(zend_class_entry *ce TSRMLS_DC);
+#endif
 
 // -----------------------------------------------------------------------------
 // RepeatedField creation/desctruction
@@ -90,76 +91,86 @@ static void repeated_field_iter_free(void *object TSRMLS_DC);
 zend_class_entry* repeated_field_type;
 zend_class_entry* repeated_field_iter_type;
 zend_object_handlers* repeated_field_handlers;
-
-void repeated_field_init(TSRMLS_D) {
-  zend_class_entry class_type;
-  const char* class_name = "Google\\Protobuf\\Internal\\RepeatedField";
-  INIT_CLASS_ENTRY_EX(class_type, class_name, strlen(class_name),
-                      repeated_field_methods);
-
-  repeated_field_type = zend_register_internal_class(&class_type TSRMLS_CC);
-  repeated_field_type->create_object = repeated_field_create;
-
-  zend_class_implements(repeated_field_type TSRMLS_CC, 3, spl_ce_ArrayAccess,
-                        zend_ce_aggregate, spl_ce_Countable);
-
-  repeated_field_handlers = PEMALLOC(zend_object_handlers);
-  memcpy(repeated_field_handlers, zend_get_std_object_handlers(),
-         sizeof(zend_object_handlers));
-  repeated_field_handlers->write_dimension = repeated_field_write_dimension;
-  repeated_field_handlers->get_gc = repeated_field_get_gc;
+zend_object_handlers* repeated_field_iter_handlers;
+
+// Define object free method.
+PHP_PROTO_OBJECT_FREE_START(RepeatedField, repeated_field)
+#if PHP_MAJOR_VERSION < 7
+php_proto_zval_ptr_dtor(intern->array);
+#else
+php_proto_zval_ptr_dtor(&intern->array);
+#endif
+PHP_PROTO_OBJECT_FREE_END
+
+PHP_PROTO_OBJECT_DTOR_START(RepeatedField, repeated_field)
+PHP_PROTO_OBJECT_DTOR_END
+
+// Define object create method.
+PHP_PROTO_OBJECT_CREATE_START(RepeatedField, repeated_field)
+#if PHP_MAJOR_VERSION < 7
+intern->array = NULL;
+#endif
+intern->type = 0;
+intern->msg_ce = NULL;
+PHP_PROTO_OBJECT_CREATE_END(RepeatedField, repeated_field)
+
+// Init class entry.
+PHP_PROTO_INIT_CLASS_START("Google\\Protobuf\\Internal\\RepeatedField",
+                           RepeatedField, repeated_field)
+zend_class_implements(repeated_field_type TSRMLS_CC, 3, spl_ce_ArrayAccess,
+                      zend_ce_aggregate, spl_ce_Countable);
+repeated_field_handlers->write_dimension = repeated_field_write_dimension;
+repeated_field_handlers->get_gc = repeated_field_get_gc;
+PHP_PROTO_INIT_CLASS_END
+
+// Define array element free function.
+#if PHP_MAJOR_VERSION < 7
+static inline void php_proto_array_string_release(void *value) {
+  zval_ptr_dtor(value);
 }
 
-static zend_object_value repeated_field_create(zend_class_entry *ce TSRMLS_DC) {
-  zend_object_value retval = {0};
-  RepeatedField *intern;
-
-  intern = emalloc(sizeof(RepeatedField));
-  memset(intern, 0, sizeof(RepeatedField));
-
-  zend_object_std_init(&intern->std, ce TSRMLS_CC);
-  object_properties_init(&intern->std, ce);
-
-  intern->array = NULL;
-  intern->type = 0;
-  intern->msg_ce = NULL;
-
-  retval.handle = zend_objects_store_put(
-      intern, (zend_objects_store_dtor_t)zend_objects_destroy_object,
-      (zend_objects_free_object_storage_t)repeated_field_free, NULL TSRMLS_CC);
-  retval.handlers = repeated_field_handlers;
-
-  return retval;
+static inline void php_proto_array_object_release(void *value) {
+  zval_ptr_dtor(value);
 }
-
-static void repeated_field_free(void *object TSRMLS_DC) {
-  RepeatedField *intern = object;
-  zend_object_std_dtor(&intern->std TSRMLS_CC);
-  zval_ptr_dtor(&intern->array);
-  efree(object);
+static inline void php_proto_array_default_release(void *value) {
+}
+#else
+static inline void php_proto_array_string_release(zval *value) {
+  void* ptr = Z_PTR_P(value);
+  zend_string* object = *(zend_string**)ptr;
+  zend_string_release(object);
+  efree(ptr);
+}
+static inline void php_proto_array_object_release(zval *value) {
+  zval_ptr_dtor(value);
 }
+static void php_proto_array_default_release(zval* value) {
+  void* ptr = Z_PTR_P(value);
+  efree(ptr);
+}
+#endif
 
 static int repeated_field_array_init(zval *array, upb_fieldtype_t type,
                                      uint size ZEND_FILE_LINE_DC) {
-  ALLOC_HASHTABLE(Z_ARRVAL_P(array));
+  PHP_PROTO_ALLOC_ARRAY(array);
 
   switch (type) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
+      zend_hash_init(Z_ARRVAL_P(array), size, NULL,
+                     php_proto_array_string_release, 0);
+      break;
     case UPB_TYPE_MESSAGE:
-      zend_hash_init(Z_ARRVAL_P(array), size, NULL, ZVAL_PTR_DTOR, 0);
+      zend_hash_init(Z_ARRVAL_P(array), size, NULL,
+                     php_proto_array_object_release, 0);
       break;
     default:
-      zend_hash_init(Z_ARRVAL_P(array), size, NULL, repeated_field_free_element,
-                     0);
+      zend_hash_init(Z_ARRVAL_P(array), size, NULL,
+                     php_proto_array_default_release, 0);
   }
-  Z_TYPE_P(array) = IS_ARRAY;
   return SUCCESS;
 }
 
-static void repeated_field_free_element(void *object) {
-}
-
 // -----------------------------------------------------------------------------
 // RepeatedField Handlers
 // -----------------------------------------------------------------------------
@@ -168,23 +179,25 @@ static void repeated_field_write_dimension(zval *object, zval *offset,
                                            zval *value TSRMLS_DC) {
   uint64_t index;
 
-  RepeatedField *intern = zend_object_store_get_object(object TSRMLS_CC);
-  HashTable *ht = HASH_OF(intern->array);
+  RepeatedField *intern = UNBOX(RepeatedField, object);
+  HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
   int size = native_slot_size(intern->type);
 
   unsigned char memory[NATIVE_SLOT_MAX_SIZE];
   memset(memory, 0, NATIVE_SLOT_MAX_SIZE);
 
-  if (!native_slot_set(intern->type, intern->msg_ce, memory, value TSRMLS_CC)) {
+  if (!native_slot_set_by_array(intern->type, intern->msg_ce, memory,
+                                value TSRMLS_CC)) {
     return;
   }
 
   if (!offset || Z_TYPE_P(offset) == IS_NULL) {
-    index = zend_hash_num_elements(HASH_OF(intern->array));
+    index = zend_hash_num_elements(PHP_PROTO_HASH_OF(intern->array));
   } else {
     if (protobuf_convert_to_uint64(offset, &index)) {
       if (!zend_hash_index_exists(ht, index)) {
-        zend_error(E_USER_ERROR, "Element at %llu doesn't exist.\n", index);
+        zend_error(E_USER_ERROR, "Element at %llu doesn't exist.\n",
+                   (long long unsigned int)index);
         return;
       }
     } else {
@@ -192,15 +205,23 @@ static void repeated_field_write_dimension(zval *object, zval *offset,
     }
   }
 
-  zend_hash_index_update(ht, index, memory, size, NULL);
+  if (intern->type == UPB_TYPE_MESSAGE) {
+    php_proto_zend_hash_index_update_zval(ht, index, *(zval**)memory);
+  } else {
+    php_proto_zend_hash_index_update_mem(ht, index, memory, size, NULL);
+  }
 }
 
+#if PHP_MAJOR_VERSION < 7
 static HashTable *repeated_field_get_gc(zval *object, zval ***table,
                                         int *n TSRMLS_DC) {
+#else
+static HashTable *repeated_field_get_gc(zval *object, zval **table, int *n) {
+#endif
   *table = NULL;
   *n = 0;
-  RepeatedField *intern = zend_object_store_get_object(object TSRMLS_CC);
-  return HASH_OF(intern->array);
+  RepeatedField *intern = UNBOX(RepeatedField, object);
+  return PHP_PROTO_HASH_OF(intern->array);
 }
 
 // -----------------------------------------------------------------------------
@@ -208,42 +229,61 @@ static HashTable *repeated_field_get_gc(zval *object, zval ***table,
 // -----------------------------------------------------------------------------
 
 void *repeated_field_index_native(RepeatedField *intern, int index TSRMLS_DC) {
-  HashTable *ht = HASH_OF(intern->array);
+  HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
   void *value;
 
-  if (zend_hash_index_find(ht, index, (void **)&value) == FAILURE) {
-    zend_error(E_USER_ERROR, "Element at %d doesn't exist.\n", index);
-    return NULL;
+  if (intern->type == UPB_TYPE_MESSAGE) {
+    if (php_proto_zend_hash_index_find_zval(ht, index, (void **)&value) ==
+        FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %d doesn't exist.\n", index);
+      return NULL;
+    }
+  } else {
+    if (php_proto_zend_hash_index_find_mem(ht, index, (void **)&value) ==
+        FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %d doesn't exist.\n", index);
+      return NULL;
+    }
   }
 
   return value;
 }
 
-void repeated_field_push_native(RepeatedField *intern, void *value TSRMLS_DC) {
-  HashTable *ht = HASH_OF(intern->array);
+void repeated_field_push_native(RepeatedField *intern, void *value) {
+  HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
   int size = native_slot_size(intern->type);
-  zend_hash_next_index_insert(ht, (void **)value, size, NULL);
+  if (intern->type == UPB_TYPE_MESSAGE) {
+    php_proto_zend_hash_next_index_insert_zval(ht, value);
+  } else {
+    php_proto_zend_hash_next_index_insert_mem(ht, (void **)value, size, NULL);
+  }
 }
 
-void repeated_field_create_with_type(zend_class_entry *ce,
-                                     const upb_fielddef *field,
-                                     zval **repeated_field TSRMLS_DC) {
-  MAKE_STD_ZVAL(*repeated_field);
-  Z_TYPE_PP(repeated_field) = IS_OBJECT;
-  Z_OBJVAL_PP(repeated_field) =
-      repeated_field_type->create_object(repeated_field_type TSRMLS_CC);
+void repeated_field_create_with_field(
+    zend_class_entry *ce, const upb_fielddef *field,
+    CACHED_VALUE *repeated_field PHP_PROTO_TSRMLS_DC) {
+  upb_fieldtype_t type = upb_fielddef_type(field);
+  const zend_class_entry *msg_ce = field_type_class(field PHP_PROTO_TSRMLS_CC);
+  repeated_field_create_with_type(ce, type, msg_ce,
+                                  repeated_field PHP_PROTO_TSRMLS_CC);
+}
+
+void repeated_field_create_with_type(
+    zend_class_entry *ce, upb_fieldtype_t type, const zend_class_entry *msg_ce,
+    CACHED_VALUE *repeated_field PHP_PROTO_TSRMLS_DC) {
+  CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(CACHED_PTR_TO_ZVAL_PTR(repeated_field),
+                                   repeated_field_type);
 
   RepeatedField *intern =
-      zend_object_store_get_object(*repeated_field TSRMLS_CC);
-  intern->type = upb_fielddef_type(field);
-  if (intern->type == UPB_TYPE_MESSAGE) {
-    const upb_msgdef *msg = upb_fielddef_msgsubdef(field);
-    zval *desc_php = get_def_obj(msg);
-    Descriptor *desc = zend_object_store_get_object(desc_php TSRMLS_CC);
-    intern->msg_ce = desc->klass;
-  }
+      UNBOX(RepeatedField, CACHED_TO_ZVAL_PTR(*repeated_field));
+  intern->type = type;
+  intern->msg_ce = msg_ce;
+#if PHP_MAJOR_VERSION < 7
   MAKE_STD_ZVAL(intern->array);
   repeated_field_array_init(intern->array, intern->type, 0 ZEND_FILE_LINE_CC);
+#else
+  repeated_field_array_init(&intern->array, intern->type, 0 ZEND_FILE_LINE_CC);
+#endif
 
   // TODO(teboring): Link class entry for message and enum
 }
@@ -267,12 +307,16 @@ PHP_METHOD(RepeatedField, __construct) {
     return;
   }
 
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
   intern->type = to_fieldtype(type);
   intern->msg_ce = klass;
 
+#if PHP_MAJOR_VERSION < 7
   MAKE_STD_ZVAL(intern->array);
   repeated_field_array_init(intern->array, intern->type, 0 ZEND_FILE_LINE_CC);
+#else
+  repeated_field_array_init(&intern->array, intern->type, 0 ZEND_FILE_LINE_CC);
+#endif
 
   if (intern->type == UPB_TYPE_MESSAGE && klass == NULL) {
     zend_error(E_USER_ERROR, "Message type must have concrete class.");
@@ -309,10 +353,10 @@ PHP_METHOD(RepeatedField, offsetExists) {
     return;
   }
 
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
 
   RETURN_BOOL(index >= 0 &&
-              index < zend_hash_num_elements(HASH_OF(intern->array)));
+              index < zend_hash_num_elements(PHP_PROTO_HASH_OF(intern->array)));
 }
 
 /**
@@ -332,15 +376,24 @@ PHP_METHOD(RepeatedField, offsetGet) {
     return;
   }
 
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
-  HashTable *table = HASH_OF(intern->array);
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
+  HashTable *table = PHP_PROTO_HASH_OF(intern->array);
 
-  if (zend_hash_index_find(table, index, (void **)&memory) == FAILURE) {
-    zend_error(E_USER_ERROR, "Element at %ld doesn't exist.\n", index);
-    return;
+  if (intern->type == UPB_TYPE_MESSAGE) {
+    if (php_proto_zend_hash_index_find_zval(table, index, (void **)&memory) ==
+        FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %ld doesn't exist.\n", index);
+      return;
+    }
+  } else {
+    if (php_proto_zend_hash_index_find_mem(table, index, (void **)&memory) ==
+        FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %ld doesn't exist.\n", index);
+      return;
+    }
   }
-
-  native_slot_get(intern->type, memory, return_value_ptr TSRMLS_CC);
+  native_slot_get_by_array(intern->type, memory,
+                           ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
 }
 
 /**
@@ -375,16 +428,16 @@ PHP_METHOD(RepeatedField, offsetUnset) {
     return;
   }
 
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
 
   // Only the element at the end of the array can be removed.
   if (index == -1 ||
-      index != (zend_hash_num_elements(HASH_OF(intern->array)) - 1)) {
+      index != (zend_hash_num_elements(PHP_PROTO_HASH_OF(intern->array)) - 1)) {
     zend_error(E_USER_ERROR, "Cannot remove element at %ld.\n", index);
     return;
   }
 
-  zend_hash_index_del(HASH_OF(intern->array), index);
+  zend_hash_index_del(PHP_PROTO_HASH_OF(intern->array), index);
 }
 
 /**
@@ -393,13 +446,13 @@ PHP_METHOD(RepeatedField, offsetUnset) {
  * @return long The number of stored elements.
  */
 PHP_METHOD(RepeatedField, count) {
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
 
   if (zend_parse_parameters_none() == FAILURE) {
     return;
   }
 
-  RETURN_LONG(zend_hash_num_elements(HASH_OF(intern->array)));
+  RETURN_LONG(zend_hash_num_elements(PHP_PROTO_HASH_OF(intern->array)));
 }
 
 /**
@@ -408,105 +461,85 @@ PHP_METHOD(RepeatedField, count) {
  * @return object Beginning iterator.
  */
 PHP_METHOD(RepeatedField, getIterator) {
-  zval *iter_php = NULL;
-  MAKE_STD_ZVAL(iter_php);
-  Z_TYPE_P(iter_php) = IS_OBJECT;
-  Z_OBJVAL_P(iter_php) = repeated_field_iter_type->create_object(
-      repeated_field_iter_type TSRMLS_CC);
-
-  RepeatedField *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
-  RepeatedFieldIter *iter = zend_object_store_get_object(iter_php TSRMLS_CC);
+  CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(return_value,
+                                   repeated_field_iter_type);
+
+  RepeatedField *intern = UNBOX(RepeatedField, getThis());
+  RepeatedFieldIter *iter = UNBOX(RepeatedFieldIter, return_value);
   iter->repeated_field = intern;
   iter->position = 0;
-
-  RETURN_ZVAL(iter_php, 1, 1);
 }
 
 // -----------------------------------------------------------------------------
 // RepeatedFieldIter creation/desctruction
 // -----------------------------------------------------------------------------
 
-void repeated_field_iter_init(TSRMLS_D) {
-  zend_class_entry class_type;
-  const char* class_name = "Google\\Protobuf\\Internal\\RepeatedFieldIter";
-  INIT_CLASS_ENTRY_EX(class_type, class_name, strlen(class_name),
-                      repeated_field_iter_methods);
-
-  repeated_field_iter_type =
-      zend_register_internal_class(&class_type TSRMLS_CC);
-  repeated_field_iter_type->create_object = repeated_field_iter_create;
-
-  zend_class_implements(repeated_field_iter_type TSRMLS_CC, 1,
-                        zend_ce_iterator);
-}
-
-static zend_object_value repeated_field_iter_create(
-    zend_class_entry *ce TSRMLS_DC) {
-  zend_object_value retval = {0};
-  RepeatedFieldIter *intern;
-
-  intern = emalloc(sizeof(RepeatedFieldIter));
-  memset(intern, 0, sizeof(RepeatedFieldIter));
-
-  zend_object_std_init(&intern->std, ce TSRMLS_CC);
-  object_properties_init(&intern->std, ce);
+// Define object free method.
+PHP_PROTO_OBJECT_FREE_START(RepeatedFieldIter, repeated_field_iter)
+PHP_PROTO_OBJECT_FREE_END
 
-  intern->repeated_field = NULL;
-  intern->position = 0;
-
-  retval.handle = zend_objects_store_put(
-      intern, (zend_objects_store_dtor_t)zend_objects_destroy_object,
-      (zend_objects_free_object_storage_t)repeated_field_iter_free,
-      NULL TSRMLS_CC);
-  retval.handlers = zend_get_std_object_handlers();
+PHP_PROTO_OBJECT_DTOR_START(RepeatedFieldIter, repeated_field_iter)
+PHP_PROTO_OBJECT_DTOR_END
 
-  return retval;
-}
+// Define object create method.
+PHP_PROTO_OBJECT_CREATE_START(RepeatedFieldIter, repeated_field_iter)
+intern->repeated_field = NULL;
+intern->position = 0;
+PHP_PROTO_OBJECT_CREATE_END(RepeatedFieldIter, repeated_field_iter)
 
-static void repeated_field_iter_free(void *object TSRMLS_DC) {
-  RepeatedFieldIter *intern = object;
-  zend_object_std_dtor(&intern->std TSRMLS_CC);
-  efree(object);
-}
+// Init class entry.
+PHP_PROTO_INIT_CLASS_START("Google\\Protobuf\\Internal\\RepeatedFieldIter",
+                           RepeatedFieldIter, repeated_field_iter)
+zend_class_implements(repeated_field_iter_type TSRMLS_CC, 1, zend_ce_iterator);
+PHP_PROTO_INIT_CLASS_END
 
 // -----------------------------------------------------------------------------
 // PHP RepeatedFieldIter Methods
 // -----------------------------------------------------------------------------
 
 PHP_METHOD(RepeatedFieldIter, rewind) {
-  RepeatedFieldIter *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedFieldIter *intern = UNBOX(RepeatedFieldIter, getThis());
   intern->position = 0;
 }
 
 PHP_METHOD(RepeatedFieldIter, current) {
-  RepeatedFieldIter *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedFieldIter *intern = UNBOX(RepeatedFieldIter, getThis());
   RepeatedField *repeated_field = intern->repeated_field;
 
   long index;
   void *memory;
 
-  HashTable *table = HASH_OF(repeated_field->array);
+  HashTable *table = PHP_PROTO_HASH_OF(repeated_field->array);
 
-  if (zend_hash_index_find(table, intern->position, (void **)&memory) ==
-      FAILURE) {
-    zend_error(E_USER_ERROR, "Element at %ld doesn't exist.\n", index);
-    return;
+  if (repeated_field->type == UPB_TYPE_MESSAGE) {
+    if (php_proto_zend_hash_index_find_zval(table, intern->position,
+                                            (void **)&memory) == FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %d doesn't exist.\n", index);
+      return;
+    }
+  } else {
+    if (php_proto_zend_hash_index_find_mem(table, intern->position,
+                                           (void **)&memory) == FAILURE) {
+      zend_error(E_USER_ERROR, "Element at %d doesn't exist.\n", index);
+      return;
+    }
   }
-  native_slot_get(repeated_field->type, memory, return_value_ptr TSRMLS_CC);
+  native_slot_get_by_array(repeated_field->type, memory,
+                           ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
 }
 
 PHP_METHOD(RepeatedFieldIter, key) {
-  RepeatedFieldIter *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedFieldIter *intern = UNBOX(RepeatedFieldIter, getThis());
   RETURN_LONG(intern->position);
 }
 
 PHP_METHOD(RepeatedFieldIter, next) {
-  RepeatedFieldIter *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
+  RepeatedFieldIter *intern = UNBOX(RepeatedFieldIter, getThis());
   ++intern->position;
 }
 
 PHP_METHOD(RepeatedFieldIter, valid) {
-  RepeatedFieldIter *intern = zend_object_store_get_object(getThis() TSRMLS_CC);
-  RETURN_BOOL(zend_hash_num_elements(HASH_OF(intern->repeated_field->array)) >
-              intern->position);
+  RepeatedFieldIter *intern = UNBOX(RepeatedFieldIter, getThis());
+  RETURN_BOOL(zend_hash_num_elements(PHP_PROTO_HASH_OF(
+                  intern->repeated_field->array)) > intern->position);
 }
diff --git a/php/ext/google/protobuf/def.c b/php/ext/google/protobuf/def.c
index 32b158e2..fa33830b 100644
--- a/php/ext/google/protobuf/def.c
+++ b/php/ext/google/protobuf/def.c
@@ -31,21 +31,30 @@
 #include "protobuf.h"
 
 // Forward declare.
-static zend_object_value descriptor_create(zend_class_entry *ce TSRMLS_DC);
 static void descriptor_init_c_instance(Descriptor* intern TSRMLS_DC);
 static void descriptor_free_c(Descriptor* object TSRMLS_DC);
-static void descriptor_free(void* object TSRMLS_DC);
 
-static zend_object_value enum_descriptor_create(zend_class_entry *ce TSRMLS_DC);
+static void field_descriptor_init_c_instance(FieldDescriptor* intern TSRMLS_DC);
+static void field_descriptor_free_c(FieldDescriptor* object TSRMLS_DC);
+
 static void enum_descriptor_init_c_instance(EnumDescriptor* intern TSRMLS_DC);
 static void enum_descriptor_free_c(EnumDescriptor* object TSRMLS_DC);
-static void enum_descriptor_free(void* object TSRMLS_DC);
 
-static zend_object_value descriptor_pool_create(zend_class_entry *ce TSRMLS_DC);
+static void enum_value_descriptor_init_c_instance(
+    EnumValueDescriptor *intern TSRMLS_DC);
+static void enum_value_descriptor_free_c(EnumValueDescriptor *object TSRMLS_DC);
+
 static void descriptor_pool_free_c(DescriptorPool* object TSRMLS_DC);
-static void descriptor_pool_free(void* object TSRMLS_DC);
 static void descriptor_pool_init_c_instance(DescriptorPool* pool TSRMLS_DC);
 
+static void internal_descriptor_pool_free_c(
+    InternalDescriptorPool *object TSRMLS_DC);
+static void internal_descriptor_pool_init_c_instance(
+    InternalDescriptorPool *pool TSRMLS_DC);
+
+static void oneof_descriptor_free_c(Oneof* object TSRMLS_DC);
+static void oneof_descriptor_init_c_instance(Oneof* pool TSRMLS_DC);
+
 // -----------------------------------------------------------------------------
 // Common Utilities
 // -----------------------------------------------------------------------------
@@ -103,42 +112,6 @@ static void append_map_entry_name(char *result, const char *field_name,
     check_upb_status(&status, msg);      \
   } while (0)
 
-// Define PHP class
-#define DEFINE_PROTOBUF_INIT_CLASS(name_lower, string_name)                  \
-  void name_lower##_init(TSRMLS_D) {                                         \
-    zend_class_entry class_type;                                             \
-    INIT_CLASS_ENTRY(class_type, string_name, name_lower##_methods);         \
-    name_lower##_type = zend_register_internal_class(&class_type TSRMLS_CC); \
-    name_lower##_type->create_object = name_lower##_create;                  \
-  }
-
-#define DEFINE_PROTOBUF_CREATE(name, name_lower)                        \
-  static zend_object_value name_lower##_create(                         \
-      zend_class_entry* ce TSRMLS_DC) {                                 \
-    zend_object_value return_value;                                     \
-    name* intern = (name*)emalloc(sizeof(name));                        \
-    memset(intern, 0, sizeof(name));                                    \
-    name_lower##_init_c_instance(intern TSRMLS_CC);                     \
-    return_value.handle = zend_objects_store_put(                       \
-        intern, (zend_objects_store_dtor_t)zend_objects_destroy_object, \
-        name_lower##_free, NULL TSRMLS_CC);                             \
-    return_value.handlers = zend_get_std_object_handlers();             \
-    return return_value;                                                \
-  }
-
-#define DEFINE_PROTOBUF_FREE(name, name_lower)            \
-  static void name_lower##_free(void* object TSRMLS_DC) { \
-    name* intern = (name*)object;                         \
-    name_lower##_free_c(intern TSRMLS_CC);                \
-    efree(object);                                        \
-  }
-
-#define DEFINE_CLASS(name, name_lower, string_name) \
-  zend_class_entry* name_lower##_type;              \
-  DEFINE_PROTOBUF_FREE(name, name_lower)            \
-  DEFINE_PROTOBUF_CREATE(name, name_lower)          \
-  DEFINE_PROTOBUF_INIT_CLASS(name_lower, string_name)
-
 // -----------------------------------------------------------------------------
 // GPBType
 // -----------------------------------------------------------------------------
@@ -177,51 +150,531 @@ void gpb_type_init(TSRMLS_D) {
 }
 
 // -----------------------------------------------------------------------------
+// Descriptor
+// -----------------------------------------------------------------------------
+
+static zend_function_entry descriptor_methods[] = {
+  PHP_ME(Descriptor, getClass, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Descriptor, getFullName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Descriptor, getField, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Descriptor, getFieldCount, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Descriptor, getOneofDecl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Descriptor, getOneofDeclCount, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+DEFINE_CLASS(Descriptor, descriptor, "Google\\Protobuf\\Descriptor");
+
+static void descriptor_free_c(Descriptor *self TSRMLS_DC) {
+  if (self->layout) {
+    free_layout(self->layout);
+  }
+  if (self->fill_handlers) {
+    upb_handlers_unref(self->fill_handlers, &self->fill_handlers);
+  }
+  if (self->fill_method) {
+    upb_pbdecodermethod_unref(self->fill_method, &self->fill_method);
+  }
+  if (self->json_fill_method) {
+    upb_json_parsermethod_unref(self->json_fill_method,
+                                &self->json_fill_method);
+  }
+  if (self->pb_serialize_handlers) {
+    upb_handlers_unref(self->pb_serialize_handlers,
+                       &self->pb_serialize_handlers);
+  }
+  if (self->json_serialize_handlers) {
+    upb_handlers_unref(self->json_serialize_handlers,
+                       &self->json_serialize_handlers);
+  }
+  if (self->json_serialize_handlers_preserve) {
+    upb_handlers_unref(self->json_serialize_handlers_preserve,
+                       &self->json_serialize_handlers_preserve);
+  }
+}
+
+static void descriptor_init_c_instance(Descriptor *desc TSRMLS_DC) {
+  desc->msgdef = NULL;
+  desc->layout = NULL;
+  desc->klass = NULL;
+  desc->fill_handlers = NULL;
+  desc->fill_method = NULL;
+  desc->json_fill_method = NULL;
+  desc->pb_serialize_handlers = NULL;
+  desc->json_serialize_handlers = NULL;
+  desc->json_serialize_handlers_preserve = NULL;
+}
+
+PHP_METHOD(Descriptor, getClass) {
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+#if PHP_MAJOR_VERSION < 7
+  const char* classname = intern->klass->name;
+#else
+  const char* classname = ZSTR_VAL(intern->klass->name);
+#endif
+  PHP_PROTO_RETVAL_STRINGL(classname, strlen(classname), 1);
+}
+
+PHP_METHOD(Descriptor, getFullName) {
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+  const char* fullname = upb_msgdef_fullname(intern->msgdef);
+  PHP_PROTO_RETVAL_STRINGL(fullname, strlen(fullname), 1);
+}
+
+PHP_METHOD(Descriptor, getField) {
+  long index;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &index) ==
+      FAILURE) {
+    zend_error(E_USER_ERROR, "Expect integer for index.\n");
+    return;
+  }
+
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+  int field_num = upb_msgdef_numfields(intern->msgdef);
+  if (index < 0 || index >= field_num) {
+    zend_error(E_USER_ERROR, "Cannot get element at %ld.\n", index);
+    return;
+  }
+
+  upb_msg_field_iter iter;
+  int i;
+  for(upb_msg_field_begin(&iter, intern->msgdef), i = 0;
+      !upb_msg_field_done(&iter) && i < index;
+      upb_msg_field_next(&iter), i++);
+  const upb_fielddef *field = upb_msg_iter_field(&iter);
+
+  PHP_PROTO_HASHTABLE_VALUE field_hashtable_value = get_def_obj(field);
+  if (field_hashtable_value == NULL) {
+#if PHP_MAJOR_VERSION < 7
+    MAKE_STD_ZVAL(field_hashtable_value);
+    ZVAL_OBJ(field_hashtable_value, field_descriptor_type->create_object(
+                                        field_descriptor_type TSRMLS_CC));
+    Z_DELREF_P(field_hashtable_value);
+#else
+    field_hashtable_value =
+        field_descriptor_type->create_object(field_descriptor_type TSRMLS_CC);
+    --GC_REFCOUNT(field_hashtable_value);
+#endif
+    FieldDescriptor *field_php =
+        UNBOX_HASHTABLE_VALUE(FieldDescriptor, field_hashtable_value);
+    field_php->fielddef = field;
+    add_def_obj(field, field_hashtable_value);
+  }
+
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(field_hashtable_value, 1, 0);
+#else
+  ++GC_REFCOUNT(field_hashtable_value);
+  RETURN_OBJ(field_hashtable_value);
+#endif
+}
+
+PHP_METHOD(Descriptor, getFieldCount) {
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+  RETURN_LONG(upb_msgdef_numfields(intern->msgdef));
+}
+
+PHP_METHOD(Descriptor, getOneofDecl) {
+  long index;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &index) ==
+      FAILURE) {
+    zend_error(E_USER_ERROR, "Expect integer for index.\n");
+    return;
+  }
+
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+  int field_num = upb_msgdef_numoneofs(intern->msgdef);
+  if (index < 0 || index >= field_num) {
+    zend_error(E_USER_ERROR, "Cannot get element at %ld.\n", index);
+    return;
+  }
+
+  upb_msg_oneof_iter iter;
+  int i;
+  for(upb_msg_oneof_begin(&iter, intern->msgdef), i = 0;
+      !upb_msg_oneof_done(&iter) && i < index;
+      upb_msg_oneof_next(&iter), i++);
+  upb_oneofdef *oneof = upb_msg_iter_oneof(&iter);
+
+  ZVAL_OBJ(return_value, oneof_descriptor_type->create_object(
+                             oneof_descriptor_type TSRMLS_CC));
+  Oneof *oneof_php = UNBOX(Oneof, return_value);
+  oneof_php->oneofdef = oneof;
+}
+
+PHP_METHOD(Descriptor, getOneofDeclCount) {
+  Descriptor *intern = UNBOX(Descriptor, getThis());
+  RETURN_LONG(upb_msgdef_numoneofs(intern->msgdef));
+}
+
+// -----------------------------------------------------------------------------
+// EnumDescriptor
+// -----------------------------------------------------------------------------
+
+static zend_function_entry enum_descriptor_methods[] = {
+  PHP_ME(EnumDescriptor, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumDescriptor, getValueCount, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+DEFINE_CLASS(EnumDescriptor, enum_descriptor,
+             "Google\\Protobuf\\EnumDescriptor");
+
+static void enum_descriptor_free_c(EnumDescriptor *self TSRMLS_DC) {
+}
+
+static void enum_descriptor_init_c_instance(EnumDescriptor *self TSRMLS_DC) {
+  self->enumdef = NULL;
+  self->klass = NULL;
+}
+
+PHP_METHOD(EnumDescriptor, getValue) {
+  long index;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &index) ==
+      FAILURE) {
+    zend_error(E_USER_ERROR, "Expect integer for index.\n");
+    return;
+  }
+
+  EnumDescriptor *intern = UNBOX(EnumDescriptor, getThis());
+  int field_num = upb_enumdef_numvals(intern->enumdef);
+  if (index < 0 || index >= field_num) {
+    zend_error(E_USER_ERROR, "Cannot get element at %ld.\n", index);
+    return;
+  }
+
+  upb_enum_iter iter;
+  int i;
+  for(upb_enum_begin(&iter, intern->enumdef), i = 0;
+      !upb_enum_done(&iter) && i < index;
+      upb_enum_next(&iter), i++);
+
+  ZVAL_OBJ(return_value, enum_value_descriptor_type->create_object(
+                             enum_value_descriptor_type TSRMLS_CC));
+  EnumValueDescriptor *enum_value_php =
+      UNBOX(EnumValueDescriptor, return_value);
+  enum_value_php->name = upb_enum_iter_name(&iter);
+  enum_value_php->number = upb_enum_iter_number(&iter);
+}
+
+PHP_METHOD(EnumDescriptor, getValueCount) {
+  EnumDescriptor *intern = UNBOX(EnumDescriptor, getThis());
+  RETURN_LONG(upb_enumdef_numvals(intern->enumdef));
+}
+
+// -----------------------------------------------------------------------------
+// EnumValueDescriptor
+// -----------------------------------------------------------------------------
+
+static zend_function_entry enum_value_descriptor_methods[] = {
+  PHP_ME(EnumValueDescriptor, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValueDescriptor, getNumber, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+DEFINE_CLASS(EnumValueDescriptor, enum_value_descriptor,
+             "Google\\Protobuf\\EnumValueDescriptor");
+
+static void enum_value_descriptor_free_c(EnumValueDescriptor *self TSRMLS_DC) {
+}
+
+static void enum_value_descriptor_init_c_instance(EnumValueDescriptor *self TSRMLS_DC) {
+  self->name = NULL;
+  self->number = 0;
+}
+
+PHP_METHOD(EnumValueDescriptor, getName) {
+  EnumValueDescriptor *intern = UNBOX(EnumValueDescriptor, getThis());
+  PHP_PROTO_RETVAL_STRINGL(intern->name, strlen(intern->name), 1);
+}
+
+PHP_METHOD(EnumValueDescriptor, getNumber) {
+  EnumValueDescriptor *intern = UNBOX(EnumValueDescriptor, getThis());
+  RETURN_LONG(intern->number);
+}
+
+// -----------------------------------------------------------------------------
+// FieldDescriptor
+// -----------------------------------------------------------------------------
+
+static zend_function_entry field_descriptor_methods[] = {
+  PHP_ME(FieldDescriptor, getName,   NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, getNumber, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, getLabel,  NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, getType,   NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, isMap,     NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, getEnumType, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldDescriptor, getMessageType, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+DEFINE_CLASS(FieldDescriptor, field_descriptor,
+             "Google\\Protobuf\\FieldDescriptor");
+
+static void field_descriptor_free_c(FieldDescriptor *self TSRMLS_DC) {
+}
+
+static void field_descriptor_init_c_instance(FieldDescriptor *self TSRMLS_DC) {
+  self->fielddef = NULL;
+}
+
+upb_fieldtype_t to_fieldtype(upb_descriptortype_t type) {
+  switch (type) {
+#define CASE(descriptor_type, type)           \
+  case UPB_DESCRIPTOR_TYPE_##descriptor_type: \
+    return UPB_TYPE_##type;
+
+  CASE(FLOAT,    FLOAT);
+  CASE(DOUBLE,   DOUBLE);
+  CASE(BOOL,     BOOL);
+  CASE(STRING,   STRING);
+  CASE(BYTES,    BYTES);
+  CASE(MESSAGE,  MESSAGE);
+  CASE(GROUP,    MESSAGE);
+  CASE(ENUM,     ENUM);
+  CASE(INT32,    INT32);
+  CASE(INT64,    INT64);
+  CASE(UINT32,   UINT32);
+  CASE(UINT64,   UINT64);
+  CASE(SINT32,   INT32);
+  CASE(SINT64,   INT64);
+  CASE(FIXED32,  UINT32);
+  CASE(FIXED64,  UINT64);
+  CASE(SFIXED32, INT32);
+  CASE(SFIXED64, INT64);
+
+#undef CONVERT
+
+  }
+
+  zend_error(E_ERROR, "Unknown field type.");
+  return 0;
+}
+
+PHP_METHOD(FieldDescriptor, getName) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  const char* name = upb_fielddef_name(intern->fielddef);
+  PHP_PROTO_RETVAL_STRINGL(name, strlen(name), 1);
+}
+
+PHP_METHOD(FieldDescriptor, getNumber) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  RETURN_LONG(upb_fielddef_number(intern->fielddef));
+}
+
+PHP_METHOD(FieldDescriptor, getLabel) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  RETURN_LONG(upb_fielddef_label(intern->fielddef));
+}
+
+PHP_METHOD(FieldDescriptor, getType) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  RETURN_LONG(upb_fielddef_descriptortype(intern->fielddef));
+}
+
+PHP_METHOD(FieldDescriptor, isMap) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  RETURN_BOOL(upb_fielddef_ismap(intern->fielddef));
+}
+
+PHP_METHOD(FieldDescriptor, getEnumType) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  const upb_enumdef *enumdef = upb_fielddef_enumsubdef(intern->fielddef);
+  if (enumdef == NULL) {
+    char error_msg[100];
+    sprintf(error_msg, "Cannot get enum type for non-enum field '%s'",
+            upb_fielddef_name(intern->fielddef));
+    zend_throw_exception(NULL, error_msg, 0 TSRMLS_CC);
+    return;
+  }
+  PHP_PROTO_HASHTABLE_VALUE desc = get_def_obj(enumdef);
+
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(desc, 1, 0);
+#else
+  ++GC_REFCOUNT(desc);
+  RETURN_OBJ(desc);
+#endif
+}
+
+PHP_METHOD(FieldDescriptor, getMessageType) {
+  FieldDescriptor *intern = UNBOX(FieldDescriptor, getThis());
+  const upb_msgdef *msgdef = upb_fielddef_msgsubdef(intern->fielddef);
+  if (msgdef == NULL) {
+    char error_msg[100];
+    sprintf(error_msg, "Cannot get message type for non-message field '%s'",
+            upb_fielddef_name(intern->fielddef));
+    zend_throw_exception(NULL, error_msg, 0 TSRMLS_CC);
+    return;
+  }
+  PHP_PROTO_HASHTABLE_VALUE desc = get_def_obj(msgdef);
+
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(desc, 1, 0);
+#else
+  ++GC_REFCOUNT(desc);
+  RETURN_OBJ(desc);
+#endif
+}
+
+// -----------------------------------------------------------------------------
+// Oneof
+// -----------------------------------------------------------------------------
+
+static zend_function_entry oneof_descriptor_methods[] = {
+  PHP_ME(Oneof, getName,  NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Oneof, getField, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Oneof, getFieldCount, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+DEFINE_CLASS(Oneof, oneof_descriptor,
+             "Google\\Protobuf\\OneofDescriptor");
+
+static void oneof_descriptor_free_c(Oneof *self TSRMLS_DC) {
+}
+
+static void oneof_descriptor_init_c_instance(Oneof *self TSRMLS_DC) {
+  self->oneofdef = NULL;
+}
+
+PHP_METHOD(Oneof, getName) {
+  Oneof *intern = UNBOX(Oneof, getThis());
+  const char *name = upb_oneofdef_name(intern->oneofdef);
+  PHP_PROTO_RETVAL_STRINGL(name, strlen(name), 1);
+}
+
+PHP_METHOD(Oneof, getField) {
+  long index;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &index) ==
+      FAILURE) {
+    zend_error(E_USER_ERROR, "Expect integer for index.\n");
+    return;
+  }
+
+  Oneof *intern = UNBOX(Oneof, getThis());
+  int field_num = upb_oneofdef_numfields(intern->oneofdef);
+  if (index < 0 || index >= field_num) {
+    zend_error(E_USER_ERROR, "Cannot get element at %ld.\n", index);
+    return;
+  }
+
+  upb_oneof_iter iter;
+  int i;
+  for(upb_oneof_begin(&iter, intern->oneofdef), i = 0;
+      !upb_oneof_done(&iter) && i < index;
+      upb_oneof_next(&iter), i++);
+  const upb_fielddef *field = upb_oneof_iter_field(&iter);
+
+  PHP_PROTO_HASHTABLE_VALUE field_hashtable_value = get_def_obj(field);
+  if (field_hashtable_value == NULL) {
+#if PHP_MAJOR_VERSION < 7
+    MAKE_STD_ZVAL(field_hashtable_value);
+    ZVAL_OBJ(field_hashtable_value, field_descriptor_type->create_object(
+                                        field_descriptor_type TSRMLS_CC));
+#else
+    field_hashtable_value =
+        field_descriptor_type->create_object(field_descriptor_type TSRMLS_CC);
+#endif
+    FieldDescriptor *field_php =
+        UNBOX_HASHTABLE_VALUE(FieldDescriptor, field_hashtable_value);
+    field_php->fielddef = field;
+    add_def_obj(field, field_hashtable_value);
+  }
+
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(field_hashtable_value, 1, 0);
+#else
+  ++GC_REFCOUNT(field_hashtable_value);
+  RETURN_OBJ(field_hashtable_value);
+#endif
+}
+
+PHP_METHOD(Oneof, getFieldCount) {
+  Oneof *intern = UNBOX(Oneof, getThis());
+  RETURN_LONG(upb_oneofdef_numfields(intern->oneofdef));
+}
+
+// -----------------------------------------------------------------------------
 // DescriptorPool
 // -----------------------------------------------------------------------------
 
 static zend_function_entry descriptor_pool_methods[] = {
   PHP_ME(DescriptorPool, getGeneratedPool, NULL,
          ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
-  PHP_ME(DescriptorPool, internalAddGeneratedFile, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(DescriptorPool, getDescriptorByClassName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(DescriptorPool, getEnumDescriptorByClassName, NULL, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+static zend_function_entry internal_descriptor_pool_methods[] = {
+  PHP_ME(InternalDescriptorPool, getGeneratedPool, NULL,
+         ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
+  PHP_ME(InternalDescriptorPool, internalAddGeneratedFile, NULL, ZEND_ACC_PUBLIC)
   ZEND_FE_END
 };
 
 DEFINE_CLASS(DescriptorPool, descriptor_pool,
+             "Google\\Protobuf\\DescriptorPool");
+DEFINE_CLASS(InternalDescriptorPool, internal_descriptor_pool,
              "Google\\Protobuf\\Internal\\DescriptorPool");
 
-zval* generated_pool_php;  // wrapper of generated pool
-DescriptorPool *generated_pool;  // The actual generated pool
+// wrapper of generated pool
+#if PHP_MAJOR_VERSION < 7
+zval* generated_pool_php;
+zval* internal_generated_pool_php;
+#else
+zend_object *generated_pool_php;
+zend_object *internal_generated_pool_php;
+#endif
+InternalDescriptorPool *generated_pool;  // The actual generated pool
 
-static void init_generated_pool_once(TSRMLS_D) {
-  if (generated_pool_php == NULL) {
+void init_generated_pool_once(TSRMLS_D) {
+  if (generated_pool == NULL) {
+#if PHP_MAJOR_VERSION < 7
     MAKE_STD_ZVAL(generated_pool_php);
-    Z_TYPE_P(generated_pool_php) = IS_OBJECT;
-    generated_pool = ALLOC(DescriptorPool);
-    descriptor_pool_init_c_instance(generated_pool TSRMLS_CC);
-    Z_OBJ_HANDLE_P(generated_pool_php) = zend_objects_store_put(
-        generated_pool, NULL,
-        (zend_objects_free_object_storage_t)descriptor_pool_free,
-        NULL TSRMLS_CC);
-    Z_OBJ_HT_P(generated_pool_php) = zend_get_std_object_handlers();
+    MAKE_STD_ZVAL(internal_generated_pool_php);
+    ZVAL_OBJ(internal_generated_pool_php,
+             internal_descriptor_pool_type->create_object(
+                 internal_descriptor_pool_type TSRMLS_CC));
+    generated_pool = UNBOX(InternalDescriptorPool, internal_generated_pool_php);
+    ZVAL_OBJ(generated_pool_php, descriptor_pool_type->create_object(
+                                     descriptor_pool_type TSRMLS_CC));
+#else
+    internal_generated_pool_php = internal_descriptor_pool_type->create_object(
+        internal_descriptor_pool_type TSRMLS_CC);
+    generated_pool = (InternalDescriptorPool *)((char *)internal_generated_pool_php -
+                                        XtOffsetOf(InternalDescriptorPool, std));
+    generated_pool_php =
+        descriptor_pool_type->create_object(descriptor_pool_type TSRMLS_CC);
+#endif
   }
 }
 
-static void descriptor_pool_init_c_instance(DescriptorPool *pool TSRMLS_DC) {
-  zend_object_std_init(&pool->std, descriptor_pool_type TSRMLS_CC);
+static void internal_descriptor_pool_init_c_instance(
+    InternalDescriptorPool *pool TSRMLS_DC) {
   pool->symtab = upb_symtab_new();
 
   ALLOC_HASHTABLE(pool->pending_list);
   zend_hash_init(pool->pending_list, 1, NULL, ZVAL_PTR_DTOR, 0);
 }
 
-static void descriptor_pool_free_c(DescriptorPool *pool TSRMLS_DC) {
+static void internal_descriptor_pool_free_c(
+    InternalDescriptorPool *pool TSRMLS_DC) {
   upb_symtab_free(pool->symtab);
 
   zend_hash_destroy(pool->pending_list);
   FREE_HASHTABLE(pool->pending_list);
 }
 
+static void descriptor_pool_init_c_instance(DescriptorPool *pool TSRMLS_DC) {
+  assert(generated_pool != NULL);
+  pool->intern = generated_pool;
+}
+
+static void descriptor_pool_free_c(DescriptorPool *pool TSRMLS_DC) {
+}
+
 static void validate_enumdef(const upb_enumdef *enumdef) {
   // Verify that an entry exists with integer value 0. (This is the default
   // value.)
@@ -247,60 +700,212 @@ static void validate_msgdef(const upb_msgdef* msgdef) {
 
 PHP_METHOD(DescriptorPool, getGeneratedPool) {
   init_generated_pool_once(TSRMLS_C);
+#if PHP_MAJOR_VERSION < 7
   RETURN_ZVAL(generated_pool_php, 1, 0);
+#else
+  ++GC_REFCOUNT(generated_pool_php);
+  RETURN_OBJ(generated_pool_php);
+#endif
 }
 
-static void convert_to_class_name_inplace(char *class_name,
-                                          const char* fullname,
-                                          const char* package_name) {
-  size_t i;
-  bool first_char = false;
-  size_t pkg_name_len = package_name == NULL ? 0 : strlen(package_name);
+PHP_METHOD(InternalDescriptorPool, getGeneratedPool) {
+  init_generated_pool_once(TSRMLS_C);
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(internal_generated_pool_php, 1, 0);
+#else
+  ++GC_REFCOUNT(internal_generated_pool_php);
+  RETURN_OBJ(internal_generated_pool_php);
+#endif
+}
+
+static size_t classname_len_max(const char *fullname,
+                                const char *package,
+                                const char *php_namespace,
+                                const char *prefix) {
+  size_t fullname_len = strlen(fullname);
+  size_t package_len = 0;
+  size_t prefix_len = 0;
+  size_t namespace_len = 0;
+  size_t length = fullname_len;
+  int i, segment, classname_start = 0;
+
+  if (package != NULL) {
+    package_len = strlen(package);
+  }
+  if (prefix != NULL) {
+    prefix_len = strlen(prefix);
+  }
+  if (php_namespace != NULL) {
+    namespace_len = strlen(php_namespace);
+  }
 
-  // In php, class name cannot be Empty.
-  if (strcmp("google.protobuf.Empty", fullname) == 0) {
-    fullname = "google.protobuf.GPBEmpty";
+  // Process package
+  if (package_len > 0) {
+    segment = 1;
+    for (i = 0; i < package_len; i++) {
+      if (package[i] == '.') {
+        segment++;
+      }
+    }
+    // In case of reserved name in package.
+    length += 3 * segment;
+
+    classname_start = package_len + 1;
   }
 
-  if (pkg_name_len == 0) {
-    strcpy(class_name, fullname);
+  // Process class name
+  segment = 1;
+  for (i = classname_start; i < fullname_len; i++) {
+    if (fullname[i] == '.') {
+      segment++;
+    }
+  }
+  if (prefix_len == 0) {
+    length += 3 * segment;
   } else {
-    class_name[0] = '.';
-    strcpy(&class_name[1], fullname);
-    for (i = 0; i <= pkg_name_len + 1; i++) {
-      // PHP package uses camel case.
-      if (!first_char && class_name[i] != '.') {
-        first_char = true;
-        class_name[i] += 'A' - 'a';
+    length += prefix_len * segment;
+  }
+
+  // The additional 2, one is for preceding '.' and the other is for trailing 0.
+  return length + namespace_len + 2;
+}
+
+static bool is_reserved(const char *segment, int length) {
+  bool result;
+  char* lower = ALLOC_N(char, length + 1);
+  memset(lower, 0, length + 1);
+  memcpy(lower, segment, length);
+  int i = 0;
+  while(lower[i]) {
+    lower[i] = (char)tolower(lower[i]);
+    i++;
+  }
+  lower[length] = 0;
+  result = is_reserved_name(lower);
+  FREE(lower);
+  return result;
+}
+
+static char* fill_prefix(const char *segment, int length,
+                         const char *prefix_given,
+                         const char *package_name, char *classname) {
+  size_t i;
+
+  if (prefix_given != NULL && strcmp(prefix_given, "") != 0) {
+    size_t prefix_len = strlen(prefix_given);
+    memcpy(classname, prefix_given, strlen(prefix_given));
+    classname += prefix_len;
+  } else {
+    if (is_reserved(segment, length)) {
+      if (package_name != NULL &&
+          strcmp("google.protobuf", package_name) == 0) {
+        memcpy(classname, "GPB", 3);
+        classname += 3;
+      } else {
+        memcpy(classname, "PB", 2);
+        classname += 2;
       }
-      // php packages are divided by '\'.
-      if (class_name[i] == '.') {
-        first_char = false;
-        class_name[i] = '\\';
+    }
+  }
+  return classname;
+}
+
+static char* fill_segment(const char *segment, int length,
+                          char *classname, bool use_camel) {
+  memcpy(classname, segment, length);
+  if (use_camel && (segment[0] < 'A' || segment[0] > 'Z')) {
+    classname[0] += 'A' - 'a';
+  }
+  return classname + length;
+}
+
+static char* fill_namespace(const char *package, const char *namespace_given,
+                            char *classname) {
+  if (namespace_given != NULL) {
+    size_t namespace_len = strlen(namespace_given);
+    memcpy(classname, namespace_given, namespace_len);
+    classname += namespace_len;
+    *classname = '\\';
+    classname++;
+  } else if (package != NULL) {
+    int i = 0, j, offset = 0;
+    size_t package_len = strlen(package);
+    while (i < package_len) {
+      j = i;
+      while (j < package_len && package[j] != '.') {
+        j++;
       }
+      classname = fill_prefix(package + i, j - i, "", package, classname);
+      classname = fill_segment(package + i, j - i, classname, true);
+      classname[0] = '\\';
+      classname++;
+      i = j + 1;
     }
   }
+  return classname;
+}
+
+static char* fill_classname(const char *fullname,
+                            const char *package,
+                            const char *namespace_given,
+                            const char *prefix, char *classname) {
+  int classname_start = 0;
+  if (package != NULL) {
+    size_t package_len = strlen(package);
+    classname_start = package_len == 0 ? 0 : package_len + 1;
+  }
+  size_t fullname_len = strlen(fullname);
+  classname = fill_prefix(fullname + classname_start,
+                          fullname_len - classname_start,
+                          prefix, package, classname);
+
+  int i = classname_start, j;
+  while (i < fullname_len) {
+    j = i;
+    while (j < fullname_len && fullname[j] != '.') {
+      j++;
+    }
+    classname = fill_segment(fullname + i, j - i, classname, false);
+    if (j != fullname_len) {
+      *classname = '_';
+      classname++;
+    }
+    i = j + 1;
+  }
+  return classname;
+}
+
+static char* fill_qualified_classname(const char *fullname,
+                                      const char *package,
+                                      const char *namespace_given,
+                                      const char *prefix, char *classname) {
+  classname = fill_namespace(package, namespace_given, classname);
+  return fill_classname(fullname, package, namespace_given, prefix, classname);
+}
+
+static void classname_no_prefix(const char *fullname, const char *package_name,
+                                char *class_name) {
+  size_t i = 0, j;
+  bool first_char = true, is_reserved = false;
+  size_t pkg_name_len = package_name == NULL ? 0 : strlen(package_name);
+  size_t message_name_start = package_name == NULL ? 0 : pkg_name_len + 1;
+  size_t message_len = (strlen(fullname) - message_name_start);
 
   // Submessage is concatenated with its containing messages by '_'.
-  for (i = pkg_name_len; i < strlen(class_name); i++) {
-    if (class_name[i] == '.') {
-      class_name[i] = '_';
+  for (j = message_name_start; j < message_name_start + message_len; j++) {
+    if (fullname[j] == '.') {
+      class_name[i++] = '_';
+    } else {
+      class_name[i++] = fullname[j];
     }
   }
 }
 
-PHP_METHOD(DescriptorPool, internalAddGeneratedFile) {
-  char *data = NULL;
-  int data_len;
+void internal_add_generated_file(const char *data, PHP_PROTO_SIZE data_len,
+                                 InternalDescriptorPool *pool TSRMLS_DC) {
   upb_filedef **files;
   size_t i;
 
-  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &data, &data_len) ==
-      FAILURE) {
-    return;
-  }
-
-  DescriptorPool *pool = UNBOX(DescriptorPool, getThis());
   CHECK_UPB(files = upb_loaddescriptor(data, data_len, &pool, &status),
             "Parse binary descriptors to internal descriptors failed");
 
@@ -320,11 +925,7 @@ PHP_METHOD(DescriptorPool, internalAddGeneratedFile) {
     switch (upb_def_type(def)) {
 #define CASE_TYPE(def_type, def_type_lower, desc_type, desc_type_lower)        \
   case UPB_DEF_##def_type: {                                                   \
-    desc_type *desc;                                                           \
-    zval *desc_php;                                                            \
-    CREATE(desc_type, desc, desc_type_lower##_init_c_instance);                \
-    BOX(desc_type, desc_php, desc, desc_type_lower##_free);                    \
-    Z_DELREF_P(desc_php);                                                      \
+    CREATE_HASHTABLE_VALUE(desc, desc_php, desc_type, desc_type_lower##_type); \
     const upb_##def_type_lower *def_type_lower =                               \
         upb_downcast_##def_type_lower(def);                                    \
     desc->def_type_lower = def_type_lower;                                     \
@@ -339,20 +940,27 @@ PHP_METHOD(DescriptorPool, internalAddGeneratedFile) {
      * bytes allocated, one for '.', one for trailing 0, and 3 for 'GPB' if    \
      * given message is google.protobuf.Empty.*/                               \
     const char *fullname = upb_##def_type_lower##_fullname(def_type_lower);    \
-    char *klass_name = ecalloc(sizeof(char), 5 + strlen(fullname));            \
-    convert_to_class_name_inplace(klass_name, fullname,                        \
-                                  upb_filedef_package(files[0]));              \
-    zend_class_entry **pce;                                                    \
-    if (zend_lookup_class(klass_name, strlen(klass_name), &pce TSRMLS_CC) ==   \
+    const char *package = upb_filedef_package(files[0]);                       \
+    const char *php_namespace = upb_filedef_phpnamespace(files[0]);            \
+    const char *prefix_given = upb_filedef_phpprefix(files[0]);                \
+    size_t classname_len = classname_len_max(fullname, package,                \
+                                             php_namespace, prefix_given);     \
+    char *classname = ecalloc(sizeof(char), classname_len);                    \
+    fill_qualified_classname(fullname, package, php_namespace,                 \
+                             prefix_given, classname);                         \
+    PHP_PROTO_CE_DECLARE pce;                                                  \
+    if (php_proto_zend_lookup_class(classname, strlen(classname), &pce) ==     \
         FAILURE) {                                                             \
       zend_error(E_ERROR, "Generated message class %s hasn't been defined",    \
-                 klass_name);                                                  \
+                 classname);                                                   \
       return;                                                                  \
     } else {                                                                   \
-      desc->klass = *pce;                                                      \
+      desc->klass = PHP_PROTO_CE_UNREF(pce);                                   \
     }                                                                          \
     add_ce_obj(desc->klass, desc_php);                                         \
-    efree(klass_name);                                                         \
+    add_proto_obj(upb_##def_type_lower##_fullname(desc->def_type_lower),       \
+                  desc_php);                                                   \
+    efree(classname);                                                          \
     break;                                                                     \
   }
 
@@ -369,7 +977,7 @@ PHP_METHOD(DescriptorPool, internalAddGeneratedFile) {
     const upb_def *def = upb_filedef_def(files[0], i);
     if (upb_def_type(def) == UPB_DEF_MSG) {
       const upb_msgdef *msgdef = upb_downcast_msgdef(def);
-      zval *desc_php = get_def_obj(msgdef);
+      PHP_PROTO_HASHTABLE_VALUE desc_php = get_def_obj(msgdef);
       build_class_from_descriptor(desc_php TSRMLS_CC);
     }
   }
@@ -378,110 +986,91 @@ PHP_METHOD(DescriptorPool, internalAddGeneratedFile) {
   upb_gfree(files);
 }
 
-// -----------------------------------------------------------------------------
-// Descriptor
-// -----------------------------------------------------------------------------
+PHP_METHOD(InternalDescriptorPool, internalAddGeneratedFile) {
+  char *data = NULL;
+  PHP_PROTO_SIZE data_len;
+  upb_filedef **files;
+  size_t i;
 
-static zend_function_entry descriptor_methods[] = {
-  ZEND_FE_END
-};
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &data, &data_len) ==
+      FAILURE) {
+    return;
+  }
 
-DEFINE_CLASS(Descriptor, descriptor, "Google\\Protobuf\\Internal\\Descriptor");
+  InternalDescriptorPool *pool = UNBOX(InternalDescriptorPool, getThis());
+  internal_add_generated_file(data, data_len, pool TSRMLS_CC);
+}
 
-static void descriptor_free_c(Descriptor *self TSRMLS_DC) {
-  if (self->layout) {
-    free_layout(self->layout);
-  }
-  if (self->fill_handlers) {
-    upb_handlers_unref(self->fill_handlers, &self->fill_handlers);
-  }
-  if (self->fill_method) {
-    upb_pbdecodermethod_unref(self->fill_method, &self->fill_method);
-  }
-  if (self->json_fill_method) {
-    upb_json_parsermethod_unref(self->json_fill_method,
-                                &self->json_fill_method);
-  }
-  if (self->pb_serialize_handlers) {
-    upb_handlers_unref(self->pb_serialize_handlers,
-                       &self->pb_serialize_handlers);
-  }
-  if (self->json_serialize_handlers) {
-    upb_handlers_unref(self->json_serialize_handlers,
-                       &self->json_serialize_handlers);
-  }
-  if (self->json_serialize_handlers_preserve) {
-    upb_handlers_unref(self->json_serialize_handlers_preserve,
-                       &self->json_serialize_handlers_preserve);
+PHP_METHOD(DescriptorPool, getDescriptorByClassName) {
+  DescriptorPool *public_pool = UNBOX(DescriptorPool, getThis());
+  InternalDescriptorPool *pool = public_pool->intern;
+
+  char *classname = NULL;
+  PHP_PROTO_SIZE classname_len;
+
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &classname,
+                            &classname_len) == FAILURE) {
+    return;
   }
-}
 
-static void descriptor_init_c_instance(Descriptor *desc TSRMLS_DC) {
-  zend_object_std_init(&desc->std, descriptor_type TSRMLS_CC);
-  desc->msgdef = NULL;
-  desc->layout = NULL;
-  desc->klass = NULL;
-  desc->fill_handlers = NULL;
-  desc->fill_method = NULL;
-  desc->json_fill_method = NULL;
-  desc->pb_serialize_handlers = NULL;
-  desc->json_serialize_handlers = NULL;
-  desc->json_serialize_handlers_preserve = NULL;
-}
+  PHP_PROTO_CE_DECLARE pce;
+  if (php_proto_zend_lookup_class(classname, classname_len, &pce) ==
+      FAILURE) {
+    RETURN_NULL();
+  }
 
-// -----------------------------------------------------------------------------
-// EnumDescriptor
-// -----------------------------------------------------------------------------
+  PHP_PROTO_HASHTABLE_VALUE desc = get_ce_obj(PHP_PROTO_CE_UNREF(pce));
+  if (desc == NULL) {
+    RETURN_NULL();
+  }
 
-static zend_function_entry enum_descriptor_methods[] = {
-  ZEND_FE_END
-};
+  zend_class_entry* instance_ce = HASHTABLE_VALUE_CE(desc);
 
-DEFINE_CLASS(EnumDescriptor, enum_descriptor,
-             "Google\\Protobuf\\Internal\\EnumDescriptor");
+  if (!instanceof_function(instance_ce, descriptor_type TSRMLS_CC)) {
+    RETURN_NULL();
+  }
 
-static void enum_descriptor_free_c(EnumDescriptor *self TSRMLS_DC) {
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(desc, 1, 0);
+#else
+  ++GC_REFCOUNT(desc);
+  RETURN_OBJ(desc);
+#endif
 }
 
-static void enum_descriptor_init_c_instance(EnumDescriptor *self TSRMLS_DC) {
-  zend_object_std_init(&self->std, enum_descriptor_type TSRMLS_CC);
-  self->enumdef = NULL;
-  self->klass = NULL;
-}
+PHP_METHOD(DescriptorPool, getEnumDescriptorByClassName) {
+  DescriptorPool *public_pool = UNBOX(DescriptorPool, getThis());
+  InternalDescriptorPool *pool = public_pool->intern;
 
-// -----------------------------------------------------------------------------
-// FieldDescriptor
-// -----------------------------------------------------------------------------
+  char *classname = NULL;
+  PHP_PROTO_SIZE classname_len;
 
-upb_fieldtype_t to_fieldtype(upb_descriptortype_t type) {
-  switch (type) {
-#define CASE(descriptor_type, type)           \
-  case UPB_DESCRIPTOR_TYPE_##descriptor_type: \
-    return UPB_TYPE_##type;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &classname,
+                            &classname_len) == FAILURE) {
+    return;
+  }
 
-  CASE(FLOAT,    FLOAT);
-  CASE(DOUBLE,   DOUBLE);
-  CASE(BOOL,     BOOL);
-  CASE(STRING,   STRING);
-  CASE(BYTES,    BYTES);
-  CASE(MESSAGE,  MESSAGE);
-  CASE(GROUP,    MESSAGE);
-  CASE(ENUM,     ENUM);
-  CASE(INT32,    INT32);
-  CASE(INT64,    INT64);
-  CASE(UINT32,   UINT32);
-  CASE(UINT64,   UINT64);
-  CASE(SINT32,   INT32);
-  CASE(SINT64,   INT64);
-  CASE(FIXED32,  UINT32);
-  CASE(FIXED64,  UINT64);
-  CASE(SFIXED32, INT32);
-  CASE(SFIXED64, INT64);
+  PHP_PROTO_CE_DECLARE pce;
+  if (php_proto_zend_lookup_class(classname, classname_len, &pce) ==
+      FAILURE) {
+    RETURN_NULL();
+  }
 
-#undef CONVERT
+  PHP_PROTO_HASHTABLE_VALUE desc = get_ce_obj(PHP_PROTO_CE_UNREF(pce));
+  if (desc == NULL) {
+    RETURN_NULL();
+  }
 
+  zend_class_entry* instance_ce = HASHTABLE_VALUE_CE(desc);
+
+  if (!instanceof_function(instance_ce, enum_descriptor_type TSRMLS_CC)) {
+    RETURN_NULL();
   }
 
-  zend_error(E_ERROR, "Unknown field type.");
-  return 0;
+#if PHP_MAJOR_VERSION < 7
+  RETURN_ZVAL(desc, 1, 0);
+#else
+  ++GC_REFCOUNT(desc);
+  RETURN_OBJ(desc);
+#endif
 }
diff --git a/php/ext/google/protobuf/encode_decode.c b/php/ext/google/protobuf/encode_decode.c
index e5a5f307..a8c47f4d 100644
--- a/php/ext/google/protobuf/encode_decode.c
+++ b/php/ext/google/protobuf/encode_decode.c
@@ -142,6 +142,23 @@ static const void* newhandlerdata(upb_handlers* h, uint32_t ofs) {
   return hd_ofs;
 }
 
+typedef size_t (*encodeunknown_handlerfunc)(void* _sink, const void* hd,
+                                            const char* ptr, size_t len,
+                                            const upb_bufhandle* handle);
+
+typedef struct {
+  encodeunknown_handlerfunc handler;
+} unknownfields_handlerdata_t;
+
+// Creates a handlerdata for unknown fields.
+static const void *newunknownfieldshandlerdata(upb_handlers* h) {
+  unknownfields_handlerdata_t* hd =
+      (unknownfields_handlerdata_t*)malloc(sizeof(unknownfields_handlerdata_t));
+  hd->handler = stringsink_string;
+  upb_handlers_addcleanup(h, hd, free);
+  return hd;
+}
+
 typedef struct {
   size_t ofs;
   const upb_msgdef *md;
@@ -164,18 +181,21 @@ typedef struct {
   int property_ofs;        // properties table cache
   uint32_t oneof_case_num; // oneof-case number to place in oneof_case field
   const upb_msgdef *md;    // msgdef, for oneof submessage handler
+  const upb_msgdef *parent_md;  // msgdef, for parent submessage
 } oneof_handlerdata_t;
 
 static const void *newoneofhandlerdata(upb_handlers *h,
                                        uint32_t ofs,
                                        uint32_t case_ofs,
                                        int property_ofs,
+                                       const upb_msgdef *m,
                                        const upb_fielddef *f) {
   oneof_handlerdata_t* hd =
       (oneof_handlerdata_t*)malloc(sizeof(oneof_handlerdata_t));
   hd->ofs = ofs;
   hd->case_ofs = case_ofs;
   hd->property_ofs = property_ofs;
+  hd->parent_md = m;
   // We reuse the field tag number as a oneof union discriminant tag. Note that
   // we don't expose these numbers to the user, so the only requirement is that
   // we have some unique ID for each union case/possibility. The field tag
@@ -197,19 +217,18 @@ static const void *newoneofhandlerdata(upb_handlers *h,
 static void *startseq_handler(void* closure, const void* hd) {
   MessageHeader* msg = closure;
   const size_t *ofs = hd;
-  return (void*)(*DEREF(msg, *ofs, zval**));
+  return CACHED_PTR_TO_ZVAL_PTR(DEREF(message_data(msg), *ofs, CACHED_VALUE*));
 }
 
 // Handlers that append primitive values to a repeated field.
-#define DEFINE_APPEND_HANDLER(type, ctype)                             \
-  static bool append##type##_handler(void* closure, const void* hd,    \
-                                     ctype val) {                      \
-    zval* array = (zval*)closure;                                      \
-    TSRMLS_FETCH();                                                    \
-    RepeatedField* intern =                                            \
-        (RepeatedField*)zend_object_store_get_object(array TSRMLS_CC); \
-    repeated_field_push_native(intern, &val TSRMLS_CC);                \
-    return true;                                                       \
+#define DEFINE_APPEND_HANDLER(type, ctype)                          \
+  static bool append##type##_handler(void* closure, const void* hd, \
+                                     ctype val) {                   \
+    zval* array = (zval*)closure;                                   \
+    TSRMLS_FETCH();                                                 \
+    RepeatedField* intern = UNBOX(RepeatedField, array);            \
+    repeated_field_push_native(intern, &val);                       \
+    return true;                                                    \
   }
 
 DEFINE_APPEND_HANDLER(bool,   bool)
@@ -226,15 +245,19 @@ static void* appendstr_handler(void *closure,
                                size_t size_hint) {
   zval* array = (zval*)closure;
   TSRMLS_FETCH();
-  RepeatedField* intern =
-      (RepeatedField*)zend_object_store_get_object(array TSRMLS_CC);
+  RepeatedField* intern = UNBOX(RepeatedField, array);
 
+#if PHP_MAJOR_VERSION < 7
   zval* str;
   MAKE_STD_ZVAL(str);
-  ZVAL_STRING(str, "", 1);
-
-  repeated_field_push_native(intern, &str TSRMLS_CC);
+  PHP_PROTO_ZVAL_STRING(str, "", 1);
+  repeated_field_push_native(intern, &str);
   return (void*)str;
+#else
+  zend_string* str = zend_string_init("", 0, 1);
+  repeated_field_push_native(intern, &str);
+  return intern;
+#endif
 }
 
 // Appends a 'bytes' string to a repeated field.
@@ -243,24 +266,60 @@ static void* appendbytes_handler(void *closure,
                                  size_t size_hint) {
   zval* array = (zval*)closure;
   TSRMLS_FETCH();
-  RepeatedField* intern =
-      (RepeatedField*)zend_object_store_get_object(array TSRMLS_CC);
+  RepeatedField* intern = UNBOX(RepeatedField, array);
 
+#if PHP_MAJOR_VERSION < 7
   zval* str;
   MAKE_STD_ZVAL(str);
-  ZVAL_STRING(str, "", 1);
-
-  repeated_field_push_native(intern, &str TSRMLS_CC);
+  PHP_PROTO_ZVAL_STRING(str, "", 1);
+  repeated_field_push_native(intern, &str);
   return (void*)str;
+#else
+  zend_string* str = zend_string_init("", 0, 1);
+  repeated_field_push_native(intern, &str);
+  return intern;
+#endif
 }
 
+// Handlers that append primitive values to a repeated field.
+#define DEFINE_SINGULAR_HANDLER(type, ctype)                \
+  static bool type##_handler(void* closure, const void* hd, \
+                                     ctype val) {           \
+    MessageHeader* msg = (MessageHeader*)closure;           \
+    const size_t *ofs = hd;                                 \
+    DEREF(message_data(msg), *ofs, ctype) = val;            \
+    return true;                                            \
+  }
+
+DEFINE_SINGULAR_HANDLER(bool,   bool)
+DEFINE_SINGULAR_HANDLER(int32,  int32_t)
+DEFINE_SINGULAR_HANDLER(uint32, uint32_t)
+DEFINE_SINGULAR_HANDLER(float,  float)
+DEFINE_SINGULAR_HANDLER(int64,  int64_t)
+DEFINE_SINGULAR_HANDLER(uint64, uint64_t)
+DEFINE_SINGULAR_HANDLER(double, double)
+
+#undef DEFINE_SINGULAR_HANDLER
+
+#if PHP_MAJOR_VERSION < 7
 static void *empty_php_string(zval** value_ptr) {
   SEPARATE_ZVAL_IF_NOT_REF(value_ptr);
-  zval* str = *value_ptr;
-  zval_dtor(str);
-  ZVAL_STRINGL(str, "", 0, 1);
-  return (void*)str;
+  if (Z_TYPE_PP(value_ptr) == IS_STRING &&
+      !IS_INTERNED(Z_STRVAL_PP(value_ptr))) {
+    FREE(Z_STRVAL_PP(value_ptr));
+  }
+  ZVAL_EMPTY_STRING(*value_ptr);
+  return (void*)(*value_ptr);
+}
+#else
+static void *empty_php_string(zval* value_ptr) {
+  if (Z_TYPE_P(value_ptr) == IS_STRING) {
+    zend_string_release(Z_STR_P(value_ptr));
+  }
+  ZVAL_EMPTY_STRING(value_ptr);
+  return value_ptr;
 }
+#endif
 
 // Sets a non-repeated string field in a message.
 static void* str_handler(void *closure,
@@ -268,7 +327,7 @@ static void* str_handler(void *closure,
                          size_t size_hint) {
   MessageHeader* msg = closure;
   const size_t *ofs = hd;
-  return empty_php_string(DEREF(msg, *ofs, zval**));
+  return empty_php_string(DEREF(message_data(msg), *ofs, CACHED_VALUE*));
 }
 
 // Sets a non-repeated 'bytes' field in a message.
@@ -277,52 +336,73 @@ static void* bytes_handler(void *closure,
                            size_t size_hint) {
   MessageHeader* msg = closure;
   const size_t *ofs = hd;
-  return empty_php_string(DEREF(msg, *ofs, zval**));
+  return empty_php_string(DEREF(message_data(msg), *ofs, CACHED_VALUE*));
 }
 
 static size_t stringdata_handler(void* closure, const void* hd,
                                  const char* str, size_t len,
                                  const upb_bufhandle* handle) {
   zval* php_str = (zval*)closure;
+#if PHP_MAJOR_VERSION < 7
+  // Oneof string/bytes fields may have NULL initial value, which doesn't need
+  // to be freed.
+  if (Z_TYPE_P(php_str) == IS_STRING && !IS_INTERNED(Z_STRVAL_P(php_str))) {
+    FREE(Z_STRVAL_P(php_str));
+  }
+  ZVAL_STRINGL(php_str, str, len, 1);
+#else
+  if (Z_TYPE_P(php_str) == IS_STRING) {
+    zend_string_release(Z_STR_P(php_str));
+  }
+  ZVAL_NEW_STR(php_str, zend_string_init(str, len, 0));
+#endif
+  return len;
+}
 
-  char* old_str = Z_STRVAL_P(php_str);
-  size_t old_len = Z_STRLEN_P(php_str);
-  assert(old_str != NULL);
-
-  char* new_str = emalloc(old_len + len + 1);
+#if PHP_MAJOR_VERSION >= 7
+static size_t zendstringdata_handler(void* closure, const void* hd,
+                                     const char* str, size_t len,
+                                     const upb_bufhandle* handle) {
+  RepeatedField* intern = (RepeatedField*)closure;
 
-  memcpy(new_str, old_str, old_len);
-  memcpy(new_str + old_len, str, len);
-  new_str[old_len + len] = 0;
-  FREE(old_str);
+  unsigned char memory[NATIVE_SLOT_MAX_SIZE];
+  memset(memory, 0, NATIVE_SLOT_MAX_SIZE);
+  *(zend_string**)memory = zend_string_init(str, len, 0);
 
-  Z_STRVAL_P(php_str) = new_str;
-  Z_STRLEN_P(php_str) = old_len + len;
+  HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
+  int index = zend_hash_num_elements(ht) - 1;
+  php_proto_zend_hash_index_update_mem(
+      ht, index, memory, sizeof(zend_string*), NULL);
 
   return len;
 }
+#endif
 
 // Appends a submessage to a repeated field.
 static void *appendsubmsg_handler(void *closure, const void *hd) {
   zval* array = (zval*)closure;
   TSRMLS_FETCH();
-  RepeatedField* intern =
-      (RepeatedField*)zend_object_store_get_object(array TSRMLS_CC);
+  RepeatedField* intern = UNBOX(RepeatedField, array);
 
   const submsg_handlerdata_t *submsgdata = hd;
-  zval* subdesc_php = get_def_obj((void*)submsgdata->md);
-  Descriptor* subdesc = zend_object_store_get_object(subdesc_php TSRMLS_CC);
+  Descriptor* subdesc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj((void*)submsgdata->md));
   zend_class_entry* subklass = subdesc->klass;
   MessageHeader* submsg;
 
+#if PHP_MAJOR_VERSION < 7
   zval* val = NULL;
   MAKE_STD_ZVAL(val);
-  Z_TYPE_P(val) = IS_OBJECT;
-  Z_OBJVAL_P(val) = subklass->create_object(subklass TSRMLS_CC);
-
-  repeated_field_push_native(intern, &val TSRMLS_CC);
+  ZVAL_OBJ(val, subklass->create_object(subklass TSRMLS_CC));
+  repeated_field_push_native(intern, &val);
+  submsg = UNBOX(MessageHeader, val);
+#else
+  zend_object* obj = subklass->create_object(subklass TSRMLS_CC);
+  repeated_field_push_native(intern, &obj);
+  submsg = (MessageHeader*)((char*)obj - XtOffsetOf(MessageHeader, std));
+#endif
+  custom_data_init(subklass, submsg PHP_PROTO_TSRMLS_CC);
 
-  submsg = zend_object_store_get_object(val TSRMLS_CC);
   return submsg;
 }
 
@@ -330,26 +410,35 @@ static void *appendsubmsg_handler(void *closure, const void *hd) {
 static void *submsg_handler(void *closure, const void *hd) {
   MessageHeader* msg = closure;
   const submsg_handlerdata_t* submsgdata = hd;
-  zval* subdesc_php = get_def_obj((void*)submsgdata->md);
   TSRMLS_FETCH();
-  Descriptor* subdesc = zend_object_store_get_object(subdesc_php TSRMLS_CC);
+  Descriptor* subdesc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj((void*)submsgdata->md));
   zend_class_entry* subklass = subdesc->klass;
   zval* submsg_php;
   MessageHeader* submsg;
 
-  if (Z_TYPE_P(*DEREF(msg, submsgdata->ofs, zval**)) == IS_NULL) {
+  if (Z_TYPE_P(CACHED_PTR_TO_ZVAL_PTR(DEREF(message_data(msg), submsgdata->ofs,
+                                            CACHED_VALUE*))) == IS_NULL) {
+#if PHP_MAJOR_VERSION < 7
     zval* val = NULL;
     MAKE_STD_ZVAL(val);
-    Z_TYPE_P(val) = IS_OBJECT;
-    Z_OBJVAL_P(val) = subklass->create_object(subklass TSRMLS_CC);
-
-    zval_ptr_dtor(DEREF(msg, submsgdata->ofs, zval**));
-    *DEREF(msg, submsgdata->ofs, zval**) = val;
+    ZVAL_OBJ(val, subklass->create_object(subklass TSRMLS_CC));
+    MessageHeader* intern = UNBOX(MessageHeader, val);
+    custom_data_init(subklass, intern PHP_PROTO_TSRMLS_CC);
+    php_proto_zval_ptr_dtor(*DEREF(message_data(msg), submsgdata->ofs, zval**));
+    *DEREF(message_data(msg), submsgdata->ofs, zval**) = val;
+#else
+    zend_object* obj = subklass->create_object(subklass TSRMLS_CC);
+    ZVAL_OBJ(DEREF(message_data(msg), submsgdata->ofs, zval*), obj);
+    MessageHeader* intern = UNBOX_HASHTABLE_VALUE(MessageHeader, obj);
+    custom_data_init(subklass, intern PHP_PROTO_TSRMLS_CC);
+#endif
   }
 
-  submsg_php = *DEREF(msg, submsgdata->ofs, zval**);
+  submsg_php = CACHED_PTR_TO_ZVAL_PTR(
+      DEREF(message_data(msg), submsgdata->ofs, CACHED_VALUE*));
 
-  submsg = zend_object_store_get_object(submsg_php TSRMLS_CC);
+  submsg = UNBOX(MessageHeader, submsg_php);
   return submsg;
 }
 
@@ -372,32 +461,52 @@ typedef struct {
 // submessage. When the submessage ends, another handler is called to insert the
 // value into the map.
 typedef struct {
-  zval* map;
   char key_storage[NATIVE_SLOT_MAX_SIZE];
   char value_storage[NATIVE_SLOT_MAX_SIZE];
-} map_parse_frame_t;
+} map_parse_frame_data_t;
 
-static void map_slot_init(void* memory, upb_fieldtype_t type) {
+PHP_PROTO_WRAP_OBJECT_START(map_parse_frame_t)
+  map_parse_frame_data_t* data;  // Place needs to be consistent with
+                                 // MessageHeader.
+  zval* map;
+  // In php7, we cannot allocate zval dynamically. So we need to add zval here
+  // to help decoding.
+  zval key_zval;
+  zval value_zval;
+PHP_PROTO_WRAP_OBJECT_END
+typedef struct map_parse_frame_t map_parse_frame_t;
+
+static void map_slot_init(void* memory, upb_fieldtype_t type, zval* cache) {
   switch (type) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
       // Store zval** in memory in order to be consistent with the layout of
       // singular fields.
       zval** holder = ALLOC(zval*);
+      *(zval***)memory = holder;
       zval* tmp;
       MAKE_STD_ZVAL(tmp);
-      ZVAL_STRINGL(tmp, "", 0, 1);
+      PHP_PROTO_ZVAL_STRINGL(tmp, "", 0, 1);
       *holder = tmp;
-      *(zval***)memory = holder;
+#else
+      *(zval**)memory = cache;
+      PHP_PROTO_ZVAL_STRINGL(*(zval**)memory, "", 0, 1);
+#endif
       break;
     }
     case UPB_TYPE_MESSAGE: {
+#if PHP_MAJOR_VERSION < 7
       zval** holder = ALLOC(zval*);
       zval* tmp;
       MAKE_STD_ZVAL(tmp);
       ZVAL_NULL(tmp);
       *holder = tmp;
       *(zval***)memory = holder;
+#else
+      *(zval**)memory = cache;
+      ZVAL_NULL(*(zval**)memory);
+#endif
       break;
     }
     default:
@@ -410,9 +519,13 @@ static void map_slot_uninit(void* memory, upb_fieldtype_t type) {
     case UPB_TYPE_MESSAGE:
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
       zval** holder = *(zval***)memory;
       zval_ptr_dtor(holder);
       FREE(holder);
+#else
+      php_proto_zval_ptr_dtor(*(zval**)memory);
+#endif
       break;
     }
     default:
@@ -424,7 +537,11 @@ static void map_slot_key(upb_fieldtype_t type, const void* from,
                          const char** keyval,
                          size_t* length) {
   if (type == UPB_TYPE_STRING) {
+#if PHP_MAJOR_VERSION < 7
     zval* key_php = **(zval***)from;
+#else
+    zval* key_php = *(zval**)from;
+#endif
     *keyval = Z_STRVAL_P(key_php);
     *length = Z_STRLEN_P(key_php);
   } else {
@@ -444,6 +561,7 @@ static void map_slot_value(upb_fieldtype_t type, const void* from,
   memset(to, 0, native_slot_size(type));
 
   switch (type) {
+#if PHP_MAJOR_VERSION < 7
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
     case UPB_TYPE_MESSAGE: {
@@ -451,6 +569,17 @@ static void map_slot_value(upb_fieldtype_t type, const void* from,
       Z_ADDREF_PP((zval**)to);
       break;
     }
+#else
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES:
+      *(zend_string**)to = Z_STR_P(*(zval**)from);
+      zend_string_addref(*(zend_string**)to);
+      break;
+    case UPB_TYPE_MESSAGE:
+      *(zend_object**)to = Z_OBJ_P(*(zval**)from);
+      ++GC_REFCOUNT(*(zend_object**)to);
+      break;
+#endif
     default:
       len = native_slot_size(type);
       memcpy(to, from, len);
@@ -462,13 +591,17 @@ static void map_slot_value(upb_fieldtype_t type, const void* from,
 static void *startmapentry_handler(void *closure, const void *hd) {
   MessageHeader* msg = closure;
   const map_handlerdata_t* mapdata = hd;
-  zval* map = *DEREF(msg, mapdata->ofs, zval**);
+  zval* map = CACHED_PTR_TO_ZVAL_PTR(
+      DEREF(message_data(msg), mapdata->ofs, CACHED_VALUE*));
 
   map_parse_frame_t* frame = ALLOC(map_parse_frame_t);
+  frame->data = ALLOC(map_parse_frame_data_t);
   frame->map = map;
 
-  map_slot_init(&frame->key_storage, mapdata->key_field_type);
-  map_slot_init(&frame->value_storage, mapdata->value_field_type);
+  map_slot_init(&frame->data->key_storage, mapdata->key_field_type,
+                &frame->key_zval);
+  map_slot_init(&frame->data->value_storage, mapdata->value_field_type,
+                &frame->value_zval);
 
   return frame;
 }
@@ -480,19 +613,20 @@ static bool endmap_handler(void* closure, const void* hd, upb_status* s) {
   const map_handlerdata_t* mapdata = hd;
 
   TSRMLS_FETCH();
-  Map *map = (Map *)zend_object_store_get_object(frame->map TSRMLS_CC);
+  Map *map = UNBOX(Map, frame->map);
 
   const char* keyval = NULL;
   upb_value v;
   size_t length;
 
-  map_slot_key(map->key_type, &frame->key_storage, &keyval, &length);
-  map_slot_value(map->value_type, &frame->value_storage, &v);
+  map_slot_key(map->key_type, &frame->data->key_storage, &keyval, &length);
+  map_slot_value(map->value_type, &frame->data->value_storage, &v);
 
   map_index_set(map, keyval, length, v);
 
-  map_slot_uninit(&frame->key_storage, mapdata->key_field_type);
-  map_slot_uninit(&frame->value_storage, mapdata->value_field_type);
+  map_slot_uninit(&frame->data->key_storage, mapdata->key_field_type);
+  map_slot_uninit(&frame->data->value_storage, mapdata->value_field_type);
+  FREE(frame->data);
   FREE(frame);
 
   return true;
@@ -528,14 +662,15 @@ static map_handlerdata_t* new_map_handlerdata(
 }
 
 // Handlers that set primitive values in oneofs.
-#define DEFINE_ONEOF_HANDLER(type, ctype)                           \
-  static bool oneof##type##_handler(void *closure, const void *hd,  \
-                                     ctype val) {                   \
-    const oneof_handlerdata_t *oneofdata = hd;                      \
-    DEREF(closure, oneofdata->case_ofs, uint32_t) =                 \
-        oneofdata->oneof_case_num;                                  \
-    DEREF(closure, oneofdata->ofs, ctype) = val;                    \
-    return true;                                                    \
+#define DEFINE_ONEOF_HANDLER(type, ctype)                          \
+  static bool oneof##type##_handler(void* closure, const void* hd, \
+                                    ctype val) {                   \
+    const oneof_handlerdata_t* oneofdata = hd;                     \
+    MessageHeader* msg = (MessageHeader*)closure;                  \
+    DEREF(message_data(closure), oneofdata->case_ofs, uint32_t) =  \
+        oneofdata->oneof_case_num;                                 \
+    DEREF(message_data(closure), oneofdata->ofs, ctype) = val;     \
+    return true;                                                   \
   }
 
 DEFINE_ONEOF_HANDLER(bool,   bool)
@@ -548,74 +683,100 @@ DEFINE_ONEOF_HANDLER(double, double)
 
 #undef DEFINE_ONEOF_HANDLER
 
-// Handlers for strings in a oneof.
-static void *oneofstr_handler(void *closure,
-                              const void *hd,
-                              size_t size_hint) {
-  MessageHeader* msg = closure;
-  const oneof_handlerdata_t *oneofdata = hd;
+static void oneof_cleanup(MessageHeader* msg,
+                          const oneof_handlerdata_t* oneofdata) {
+  uint32_t old_case_num =
+      DEREF(message_data(msg), oneofdata->case_ofs, uint32_t);
+  if (old_case_num == 0) {
+    return;
+  }
 
-  DEREF(msg, oneofdata->case_ofs, uint32_t) =
-      oneofdata->oneof_case_num;
-  DEREF(msg, oneofdata->ofs, zval**) =
-      &(msg->std.properties_table)[oneofdata->property_ofs];
+  const upb_fielddef* old_field =
+      upb_msgdef_itof(oneofdata->parent_md, old_case_num);
+  bool need_clean = false;
 
-  return empty_php_string(DEREF(msg, oneofdata->ofs, zval**));
+  switch (upb_fielddef_type(old_field)) {
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES:
+      need_clean = true;
+      break;
+    case UPB_TYPE_MESSAGE:
+      if (oneofdata->oneof_case_num != old_case_num) {
+        need_clean = true;
+      }
+      break;
+    default:
+      break;
+  }
+
+  if (need_clean) {
+#if PHP_MAJOR_VERSION < 7
+    SEPARATE_ZVAL_IF_NOT_REF(
+        DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+    php_proto_zval_ptr_dtor(
+        *DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+    MAKE_STD_ZVAL(*DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+    ZVAL_NULL(*DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+#endif
+  }
 }
 
+// Handlers for string/bytes in a oneof.
 static void *oneofbytes_handler(void *closure,
                                 const void *hd,
                                 size_t size_hint) {
   MessageHeader* msg = closure;
   const oneof_handlerdata_t *oneofdata = hd;
 
-  DEREF(msg, oneofdata->case_ofs, uint32_t) =
+  oneof_cleanup(msg, oneofdata);
+
+  DEREF(message_data(msg), oneofdata->case_ofs, uint32_t) =
       oneofdata->oneof_case_num;
-  DEREF(msg, oneofdata->ofs, zval**) =
-      &(msg->std.properties_table)[oneofdata->property_ofs];
+  DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*) =
+      OBJ_PROP(&msg->std, oneofdata->property_ofs);
+
+   return empty_php_string(DEREF(
+       message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+}
 
+static void *oneofstr_handler(void *closure,
+                              const void *hd,
+                              size_t size_hint) {
   // TODO(teboring): Add it back.
   // rb_enc_associate(str, kRubyString8bitEncoding);
-
-  SEPARATE_ZVAL_IF_NOT_REF(DEREF(msg, oneofdata->ofs, zval**));
-  zval* str = *DEREF(msg, oneofdata->ofs, zval**);
-  zval_dtor(str);
-  ZVAL_STRINGL(str, "", 0, 1);
-  return (void*)str;
+  return oneofbytes_handler(closure, hd, size_hint);
 }
 
 // Handler for a submessage field in a oneof.
 static void* oneofsubmsg_handler(void* closure, const void* hd) {
   MessageHeader* msg = closure;
   const oneof_handlerdata_t *oneofdata = hd;
-  uint32_t oldcase = DEREF(msg, oneofdata->case_ofs, uint32_t);
-  zval* subdesc_php = get_def_obj((void*)oneofdata->md);
+  uint32_t oldcase = DEREF(message_data(msg), oneofdata->case_ofs, uint32_t);
   TSRMLS_FETCH();
-  Descriptor* subdesc = zend_object_store_get_object(subdesc_php TSRMLS_CC);
+  Descriptor* subdesc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj((void*)oneofdata->md));
   zend_class_entry* subklass = subdesc->klass;
   zval* submsg_php;
   MessageHeader* submsg;
 
   if (oldcase != oneofdata->oneof_case_num) {
-    DEREF(msg, oneofdata->ofs, zval**) =
-        &(msg->std.properties_table)[oneofdata->property_ofs];
+    oneof_cleanup(msg, oneofdata);
+
+    // Create new message.
+    DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*) =
+        OBJ_PROP(&msg->std, oneofdata->property_ofs);
+    ZVAL_OBJ(CACHED_PTR_TO_ZVAL_PTR(
+        DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*)),
+        subklass->create_object(subklass TSRMLS_CC));
   }
 
-  if (Z_TYPE_P(*DEREF(msg, oneofdata->ofs, zval**)) == IS_NULL) {
-    zval* val = NULL;
-    MAKE_STD_ZVAL(val);
-    Z_TYPE_P(val) = IS_OBJECT;
-    Z_OBJVAL_P(val) = subklass->create_object(subklass TSRMLS_CC);
-
-    zval_ptr_dtor(DEREF(msg, oneofdata->ofs, zval**));
-    *DEREF(msg, oneofdata->ofs, zval**) = val;
-  }
-
-  DEREF(msg, oneofdata->case_ofs, uint32_t) =
+  DEREF(message_data(msg), oneofdata->case_ofs, uint32_t) =
       oneofdata->oneof_case_num;
 
-  submsg_php = *DEREF(msg, oneofdata->ofs, zval**);
-  submsg = zend_object_store_get_object(submsg_php TSRMLS_CC);
+  submsg_php = CACHED_PTR_TO_ZVAL_PTR(
+      DEREF(message_data(msg), oneofdata->ofs, CACHED_VALUE*));
+  submsg = UNBOX(MessageHeader, submsg_php);
+  custom_data_init(subklass, submsg PHP_PROTO_TSRMLS_CC);
   return submsg;
 }
 
@@ -652,7 +813,11 @@ static void add_handlers_for_repeated_field(upb_handlers *h,
       upb_handlers_setstartstr(h, f, is_bytes ?
                                appendbytes_handler : appendstr_handler,
                                NULL);
+#if PHP_MAJOR_VERSION < 7
       upb_handlers_setstring(h, f, stringdata_handler, NULL);
+#else
+      upb_handlers_setstring(h, f, zendstringdata_handler, NULL);
+#endif
       break;
     }
     case UPB_TYPE_MESSAGE: {
@@ -670,16 +835,26 @@ static void add_handlers_for_singular_field(upb_handlers *h,
                                             const upb_fielddef *f,
                                             size_t offset) {
   switch (upb_fielddef_type(f)) {
-    case UPB_TYPE_BOOL:
-    case UPB_TYPE_INT32:
-    case UPB_TYPE_UINT32:
-    case UPB_TYPE_ENUM:
-    case UPB_TYPE_FLOAT:
-    case UPB_TYPE_INT64:
-    case UPB_TYPE_UINT64:
-    case UPB_TYPE_DOUBLE:
-      upb_msg_setscalarhandler(h, f, offset, -1);
-      break;
+
+#define SET_HANDLER(utype, ltype)                                     \
+  case utype: {                                                       \
+    upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;               \
+    upb_handlerattr_sethandlerdata(&attr, newhandlerdata(h, offset)); \
+    upb_handlers_set##ltype(h, f, ltype##_handler, &attr);            \
+    break;                                                            \
+  }
+
+    SET_HANDLER(UPB_TYPE_BOOL,   bool);
+    SET_HANDLER(UPB_TYPE_INT32,  int32);
+    SET_HANDLER(UPB_TYPE_UINT32, uint32);
+    SET_HANDLER(UPB_TYPE_ENUM,   int32);
+    SET_HANDLER(UPB_TYPE_FLOAT,  float);
+    SET_HANDLER(UPB_TYPE_INT64,  int64);
+    SET_HANDLER(UPB_TYPE_UINT64, uint64);
+    SET_HANDLER(UPB_TYPE_DOUBLE, double);
+
+#undef SET_HANDLER
+
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
       bool is_bytes = upb_fielddef_type(f) == UPB_TYPE_BYTES;
@@ -730,13 +905,16 @@ static void add_handlers_for_mapentry(const upb_msgdef* msgdef, upb_handlers* h,
   upb_handlers_setendmsg(h, endmap_handler, &attr);
 
   add_handlers_for_singular_field(h, key_field,
-                                  offsetof(map_parse_frame_t, key_storage));
+                                  offsetof(map_parse_frame_data_t,
+                                           key_storage));
   add_handlers_for_singular_field(h, value_field,
-                                  offsetof(map_parse_frame_t, value_storage));
+                                  offsetof(map_parse_frame_data_t, 
+                                           value_storage));
 }
 
 // Set up handlers for a oneof field.
 static void add_handlers_for_oneof_field(upb_handlers *h,
+                                         const upb_msgdef *m,
                                          const upb_fielddef *f,
                                          size_t offset,
                                          size_t oneof_case_offset,
@@ -745,7 +923,7 @@ static void add_handlers_for_oneof_field(upb_handlers *h,
   upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;
   upb_handlerattr_sethandlerdata(
       &attr, newoneofhandlerdata(h, offset, oneof_case_offset,
-                                 property_cache_offset, f));
+                                 property_cache_offset, m, f));
 
   switch (upb_fielddef_type(f)) {
 
@@ -783,12 +961,30 @@ static void add_handlers_for_oneof_field(upb_handlers *h,
   upb_handlerattr_uninit(&attr);
 }
 
+static bool add_unknown_handler(void* closure, const void* hd, const char* buf,
+                         size_t size) {
+  encodeunknown_handlerfunc handler =
+      ((unknownfields_handlerdata_t*)hd)->handler;
+
+  MessageHeader* msg = (MessageHeader*)closure;
+  stringsink* unknown = DEREF(message_data(msg), 0, stringsink*);
+  if (unknown == NULL) {
+    DEREF(message_data(msg), 0, stringsink*) = ALLOC(stringsink);
+    unknown = DEREF(message_data(msg), 0, stringsink*);
+    stringsink_init(unknown);
+  }
+
+  handler(unknown, NULL, buf, size, NULL);
+
+  return true;
+}
+
 static void add_handlers_for_message(const void* closure,
                                      upb_handlers* h) {
   const upb_msgdef* msgdef = upb_handlers_msgdef(h);
   TSRMLS_FETCH();
-  Descriptor* desc = (Descriptor*)zend_object_store_get_object(
-      get_def_obj((void*)msgdef) TSRMLS_CC);
+  Descriptor* desc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj((void*)msgdef));
   upb_msg_field_iter i;
 
   // If this is a mapentry message type, set up a special set of handlers and
@@ -806,21 +1002,23 @@ static void add_handlers_for_message(const void* closure,
     desc->layout = create_layout(desc->msgdef);
   }
 
+  upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;
+  upb_handlerattr_sethandlerdata(&attr, newunknownfieldshandlerdata(h));
+  upb_handlers_setunknown(h, add_unknown_handler, &attr);
+
   for (upb_msg_field_begin(&i, desc->msgdef);
        !upb_msg_field_done(&i);
        upb_msg_field_next(&i)) {
     const upb_fielddef *f = upb_msg_iter_field(&i);
-    size_t offset = desc->layout->fields[upb_fielddef_index(f)].offset +
-        sizeof(MessageHeader);
+    size_t offset = desc->layout->fields[upb_fielddef_index(f)].offset;
 
     if (upb_fielddef_containingoneof(f)) {
       size_t oneof_case_offset =
-          desc->layout->fields[upb_fielddef_index(f)].case_offset +
-          sizeof(MessageHeader);
+          desc->layout->fields[upb_fielddef_index(f)].case_offset;
       int property_cache_index =
           desc->layout->fields[upb_fielddef_index(f)].cache_index;
-      add_handlers_for_oneof_field(h, f, offset, oneof_case_offset,
-                                   property_cache_index);
+      add_handlers_for_oneof_field(h, desc->msgdef, f, offset,
+                                   oneof_case_offset, property_cache_index);
     } else if (is_map_field(f)) {
       add_handlers_for_mapfield(h, f, offset, desc);
     } else if (upb_fielddef_isseq(f)) {
@@ -883,6 +1081,8 @@ static const upb_json_parsermethod *msgdef_jsonparsermethod(Descriptor* desc) {
 
 static void putmsg(zval* msg, const Descriptor* desc, upb_sink* sink,
                    int depth TSRMLS_DC);
+static void putrawmsg(MessageHeader* msg, const Descriptor* desc,
+                      upb_sink* sink, int depth TSRMLS_DC);
 
 static void putstr(zval* str, const upb_fielddef* f, upb_sink* sink);
 
@@ -891,6 +1091,8 @@ static void putrawstr(const char* str, int len, const upb_fielddef* f,
 
 static void putsubmsg(zval* submsg, const upb_fielddef* f, upb_sink* sink,
                       int depth TSRMLS_DC);
+static void putrawsubmsg(MessageHeader* submsg, const upb_fielddef* f,
+                         upb_sink* sink, int depth TSRMLS_DC);
 
 static void putarray(zval* array, const upb_fielddef* f, upb_sink* sink,
                      int depth TSRMLS_DC);
@@ -933,8 +1135,14 @@ static void put_optional_value(const void* memory, int len, const upb_fielddef*
       putrawstr(memory, len, f, sink);
       break;
     case UPB_TYPE_MESSAGE: {
-      zval* submsg = *(zval**)memory;
-      putsubmsg(submsg, f, sink, depth TSRMLS_CC);
+#if PHP_MAJOR_VERSION < 7
+      MessageHeader *submsg = UNBOX(MessageHeader, *(zval**)memory);
+#else
+      MessageHeader *submsg =
+          (MessageHeader*)((char*)(*(zend_object**)memory) -
+              XtOffsetOf(MessageHeader, std));
+#endif
+      putrawsubmsg(submsg, f, sink, depth TSRMLS_CC);
       break;
     }
     default:
@@ -947,7 +1155,11 @@ static const char* raw_value(void* memory, const upb_fielddef* f) {
   switch (upb_fielddef_type(f)) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
+#if PHP_MAJOR_VERSION < 7
       return Z_STRVAL_PP((zval**)memory);
+#else
+      return ZSTR_VAL(*(zend_string**)memory);
+#endif
       break;
     default:
       return memory;
@@ -958,8 +1170,11 @@ static int raw_value_len(void* memory, int len, const upb_fielddef* f) {
   switch (upb_fielddef_type(f)) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
+#if PHP_MAJOR_VERSION < 7
       return Z_STRLEN_PP((zval**)memory);
-      break;
+#else
+      return ZSTR_LEN(*(zend_string**)memory);
+#endif
     default:
       return len;
   }
@@ -967,7 +1182,6 @@ static int raw_value_len(void* memory, int len, const upb_fielddef* f) {
 
 static void putmap(zval* map, const upb_fielddef* f, upb_sink* sink,
                    int depth TSRMLS_DC) {
-  Map* self;
   upb_sink subsink;
   const upb_fielddef* key_field;
   const upb_fielddef* value_field;
@@ -975,8 +1189,7 @@ static void putmap(zval* map, const upb_fielddef* f, upb_sink* sink,
   int len, size;
 
   assert(map != NULL);
-  Map* intern =
-      (Map*)zend_object_store_get_object(map TSRMLS_CC);
+  Map* intern = UNBOX(Map, map);
   size = upb_strtable_count(&intern->table);
   if (size == 0) return;
 
@@ -1013,6 +1226,12 @@ static void putmap(zval* map, const upb_fielddef* f, upb_sink* sink,
 
 static void putmsg(zval* msg_php, const Descriptor* desc, upb_sink* sink,
                    int depth TSRMLS_DC) {
+  MessageHeader* msg = UNBOX(MessageHeader, msg_php);
+  putrawmsg(msg, desc, sink, depth TSRMLS_CC);
+}
+
+static void putrawmsg(MessageHeader* msg, const Descriptor* desc,
+                      upb_sink* sink, int depth TSRMLS_DC) {
   upb_msg_field_iter i;
   upb_status status;
 
@@ -1025,53 +1244,57 @@ static void putmsg(zval* msg_php, const Descriptor* desc, upb_sink* sink,
              "Maximum recursion depth exceeded during encoding.");
   }
 
-  MessageHeader* msg = zend_object_store_get_object(msg_php TSRMLS_CC);
-
   for (upb_msg_field_begin(&i, desc->msgdef); !upb_msg_field_done(&i);
        upb_msg_field_next(&i)) {
     upb_fielddef* f = upb_msg_iter_field(&i);
-    uint32_t offset = desc->layout->fields[upb_fielddef_index(f)].offset +
-                      sizeof(MessageHeader);
+    uint32_t offset = desc->layout->fields[upb_fielddef_index(f)].offset;
+    bool containing_oneof = false;
 
     if (upb_fielddef_containingoneof(f)) {
       uint32_t oneof_case_offset =
-          desc->layout->fields[upb_fielddef_index(f)].case_offset +
-          sizeof(MessageHeader);
+          desc->layout->fields[upb_fielddef_index(f)].case_offset;
       // For a oneof, check that this field is actually present -- skip all the
       // below if not.
-      if (DEREF(msg, oneof_case_offset, uint32_t) != upb_fielddef_number(f)) {
+      if (DEREF(message_data(msg), oneof_case_offset, uint32_t) !=
+          upb_fielddef_number(f)) {
         continue;
       }
       // Otherwise, fall through to the appropriate singular-field handler
       // below.
+      containing_oneof = true;
     }
 
     if (is_map_field(f)) {
-      zval* map = *DEREF(msg, offset, zval**);
+      zval* map = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
       if (map != NULL) {
         putmap(map, f, sink, depth TSRMLS_CC);
       }
     } else if (upb_fielddef_isseq(f)) {
-      zval* array = *DEREF(msg, offset, zval**);
+      zval* array = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
       if (array != NULL) {
         putarray(array, f, sink, depth TSRMLS_CC);
       }
     } else if (upb_fielddef_isstring(f)) {
-      zval* str = *DEREF(msg, offset, zval**);
-      if (Z_STRLEN_P(str) > 0) {
+      zval* str = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
+      if (containing_oneof || Z_STRLEN_P(str) > 0) {
         putstr(str, f, sink);
       }
     } else if (upb_fielddef_issubmsg(f)) {
-      putsubmsg(*DEREF(msg, offset, zval**), f, sink, depth TSRMLS_CC);
+      putsubmsg(CACHED_PTR_TO_ZVAL_PTR(
+                    DEREF(message_data(msg), offset, CACHED_VALUE*)),
+                f, sink, depth TSRMLS_CC);
     } else {
       upb_selector_t sel = getsel(f, upb_handlers_getprimitivehandlertype(f));
 
-#define T(upbtypeconst, upbtype, ctype, default_value) \
-  case upbtypeconst: {                                 \
-    ctype value = DEREF(msg, offset, ctype);           \
-    if (value != default_value) {                      \
-      upb_sink_put##upbtype(sink, sel, value);         \
-    }                                                  \
+#define T(upbtypeconst, upbtype, ctype, default_value)     \
+  case upbtypeconst: {                                     \
+    ctype value = DEREF(message_data(msg), offset, ctype); \
+    if (containing_oneof || value != default_value) {      \
+      upb_sink_put##upbtype(sink, sel, value);             \
+    }                                                      \
   } break;
 
       switch (upb_fielddef_type(f)) {
@@ -1079,10 +1302,10 @@ static void putmsg(zval* msg_php, const Descriptor* desc, upb_sink* sink,
         T(UPB_TYPE_DOUBLE, double, double, 0.0)
         T(UPB_TYPE_BOOL, bool, uint8_t, 0)
         case UPB_TYPE_ENUM:
-          T(UPB_TYPE_INT32, int32, int32_t, 0)
-          T(UPB_TYPE_UINT32, uint32, uint32_t, 0)
-          T(UPB_TYPE_INT64, int64, int64_t, 0)
-          T(UPB_TYPE_UINT64, uint64, uint64_t, 0)
+        T(UPB_TYPE_INT32, int32, int32_t, 0)
+        T(UPB_TYPE_UINT32, uint32, uint32_t, 0)
+        T(UPB_TYPE_INT64, int64, int64_t, 0)
+        T(UPB_TYPE_UINT64, uint64, uint64_t, 0)
 
         case UPB_TYPE_STRING:
         case UPB_TYPE_BYTES:
@@ -1094,6 +1317,11 @@ static void putmsg(zval* msg_php, const Descriptor* desc, upb_sink* sink,
     }
   }
 
+  stringsink* unknown = DEREF(message_data(msg), 0, stringsink*);
+  if (unknown != NULL) {
+    upb_sink_putunknown(sink, unknown->ptr, unknown->len);
+  }
+
   upb_sink_endmsg(sink, &status);
 }
 
@@ -1104,18 +1332,23 @@ static void putstr(zval* str, const upb_fielddef *f, upb_sink *sink) {
 
   assert(Z_TYPE_P(str) == IS_STRING);
 
-  // Ensure that the string has the correct encoding. We also check at field-set
-  // time, but the user may have mutated the string object since then.
-  if (upb_fielddef_type(f) == UPB_TYPE_STRING &&
-      !is_structurally_valid_utf8(Z_STRVAL_P(str), Z_STRLEN_P(str))) {
-    zend_error(E_USER_ERROR, "Given string is not UTF8 encoded.");
-    return;
-  }
-
   upb_sink_startstr(sink, getsel(f, UPB_HANDLER_STARTSTR), Z_STRLEN_P(str),
                     &subsink);
-  upb_sink_putstring(&subsink, getsel(f, UPB_HANDLER_STRING), Z_STRVAL_P(str),
-                     Z_STRLEN_P(str), NULL);
+
+  // For oneof string field, we may get here with string length is zero.
+  if (Z_STRLEN_P(str) > 0) {
+    // Ensure that the string has the correct encoding. We also check at
+    // field-set time, but the user may have mutated the string object since
+    // then.
+    if (upb_fielddef_type(f) == UPB_TYPE_STRING &&
+        !is_structurally_valid_utf8(Z_STRVAL_P(str), Z_STRLEN_P(str))) {
+      zend_error(E_USER_ERROR, "Given string is not UTF8 encoded.");
+      return;
+    }
+    upb_sink_putstring(&subsink, getsel(f, UPB_HANDLER_STRING), Z_STRVAL_P(str),
+                       Z_STRLEN_P(str), NULL);
+  }
+
   upb_sink_endstr(sink, getsel(f, UPB_HANDLER_ENDSTR));
 }
 
@@ -1138,18 +1371,23 @@ static void putrawstr(const char* str, int len, const upb_fielddef* f,
   upb_sink_endstr(sink, getsel(f, UPB_HANDLER_ENDSTR));
 }
 
-static void putsubmsg(zval* submsg, const upb_fielddef* f, upb_sink* sink,
+static void putsubmsg(zval* submsg_php, const upb_fielddef* f, upb_sink* sink,
                       int depth TSRMLS_DC) {
-  upb_sink subsink;
+  if (Z_TYPE_P(submsg_php) == IS_NULL) return;
 
-  if (Z_TYPE_P(submsg) == IS_NULL) return;
+  MessageHeader *submsg = UNBOX(MessageHeader, submsg_php);
+  putrawsubmsg(submsg, f, sink, depth TSRMLS_CC);
+}
+
+static void putrawsubmsg(MessageHeader* submsg, const upb_fielddef* f,
+                         upb_sink* sink, int depth TSRMLS_DC) {
+  upb_sink subsink;
 
-  zval* php_descriptor = get_def_obj(upb_fielddef_msgsubdef(f));
   Descriptor* subdesc =
-      (Descriptor*)zend_object_store_get_object(php_descriptor TSRMLS_CC);
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(upb_fielddef_msgsubdef(f)));
 
   upb_sink_startsubmsg(sink, getsel(f, UPB_HANDLER_STARTSUBMSG), &subsink);
-  putmsg(submsg, subdesc, &subsink, depth + 1 TSRMLS_CC);
+  putrawmsg(submsg, subdesc, &subsink, depth + 1 TSRMLS_CC);
   upb_sink_endsubmsg(sink, getsel(f, UPB_HANDLER_ENDSUBMSG));
 }
 
@@ -1161,9 +1399,9 @@ static void putarray(zval* array, const upb_fielddef* f, upb_sink* sink,
   int size, i;
 
   assert(array != NULL);
-  RepeatedField* intern =
-      (RepeatedField*)zend_object_store_get_object(array TSRMLS_CC);
-  size = zend_hash_num_elements(HASH_OF(intern->array));
+  RepeatedField* intern = UNBOX(RepeatedField, array);
+  HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
+  size = zend_hash_num_elements(ht);
   if (size == 0) return;
 
   upb_sink_startseq(sink, getsel(f, UPB_HANDLER_STARTSEQ), &subsink);
@@ -1190,12 +1428,28 @@ static void putarray(zval* array, const upb_fielddef* f, upb_sink* sink,
         T(UPB_TYPE_UINT64, uint64, uint64_t)
 
       case UPB_TYPE_STRING:
-      case UPB_TYPE_BYTES:
-        putstr(*((zval**)memory), f, &subsink);
+      case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
+        const char* rawstr = Z_STRVAL_P(*(zval**)memory);
+        int len = Z_STRLEN_P(*(zval**)memory);
+#else
+        const char* rawstr = ZSTR_VAL(*(zend_string**)memory);
+        int len = ZSTR_LEN(*(zend_string**)memory);
+#endif
+        putrawstr(rawstr, len, f, &subsink);
         break;
-      case UPB_TYPE_MESSAGE:
-        putsubmsg(*((zval**)memory), f, &subsink, depth TSRMLS_CC);
+      }
+      case UPB_TYPE_MESSAGE: {
+#if PHP_MAJOR_VERSION < 7
+        MessageHeader *submsg = UNBOX(MessageHeader, *(zval**)memory);
+#else
+        MessageHeader *submsg =
+            (MessageHeader*)((char*)(Z_OBJ_P((zval*)memory)) -
+                XtOffsetOf(MessageHeader, std));
+#endif
+        putrawsubmsg(submsg, f, &subsink, depth TSRMLS_CC);
         break;
+      }
 
 #undef T
     }
@@ -1234,10 +1488,9 @@ static const upb_handlers* msgdef_json_serialize_handlers(
 // PHP encode/decode methods
 // -----------------------------------------------------------------------------
 
-PHP_METHOD(Message, serializeToString) {
-  zval* php_descriptor = get_ce_obj(Z_OBJCE_P(getThis()));
+void serialize_to_string(zval* val, zval* return_value TSRMLS_DC) {
   Descriptor* desc =
-      (Descriptor*)zend_object_store_get_object(php_descriptor TSRMLS_CC);
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(val)));
 
   stringsink sink;
   stringsink_init(&sink);
@@ -1251,48 +1504,54 @@ PHP_METHOD(Message, serializeToString) {
     stackenv_init(&se, "Error occurred during encoding: %s");
     encoder = upb_pb_encoder_create(&se.env, serialize_handlers, &sink.sink);
 
-    putmsg(getThis(), desc, upb_pb_encoder_input(encoder), 0 TSRMLS_CC);
+    putmsg(val, desc, upb_pb_encoder_input(encoder), 0 TSRMLS_CC);
 
-    RETVAL_STRINGL(sink.ptr, sink.len, 1);
+    PHP_PROTO_RETVAL_STRINGL(sink.ptr, sink.len, 1);
 
     stackenv_uninit(&se);
     stringsink_uninit(&sink);
   }
 }
 
+PHP_METHOD(Message, serializeToString) {
+  serialize_to_string(getThis(), return_value TSRMLS_CC);
+}
+
+void merge_from_string(const char* data, int data_len, const Descriptor* desc,
+                       MessageHeader* msg) {
+  const upb_pbdecodermethod* method = msgdef_decodermethod(desc);
+  const upb_handlers* h = upb_pbdecodermethod_desthandlers(method);
+  stackenv se;
+  upb_sink sink;
+  upb_pbdecoder* decoder;
+  stackenv_init(&se, "Error occurred during parsing: %s");
+
+  upb_sink_reset(&sink, h, msg);
+  decoder = upb_pbdecoder_create(&se.env, method, &sink);
+  upb_bufsrc_putbuf(data, data_len, upb_pbdecoder_input(decoder));
+
+  stackenv_uninit(&se);
+}
+
 PHP_METHOD(Message, mergeFromString) {
-  zval* php_descriptor = get_ce_obj(Z_OBJCE_P(getThis()));
   Descriptor* desc =
-      (Descriptor*)zend_object_store_get_object(php_descriptor TSRMLS_CC);
-  MessageHeader* msg = zend_object_store_get_object(getThis() TSRMLS_CC);
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(getThis())));
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
 
   char *data = NULL;
-  int data_len;
+  PHP_PROTO_SIZE data_len;
+
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &data, &data_len) ==
       FAILURE) {
     return;
   }
 
-  {
-    const upb_pbdecodermethod* method = msgdef_decodermethod(desc);
-    const upb_handlers* h = upb_pbdecodermethod_desthandlers(method);
-    stackenv se;
-    upb_sink sink;
-    upb_pbdecoder* decoder;
-    stackenv_init(&se, "Error occurred during parsing: %s");
-
-    upb_sink_reset(&sink, h, msg);
-    decoder = upb_pbdecoder_create(&se.env, method, &sink);
-    upb_bufsrc_putbuf(data, data_len, upb_pbdecoder_input(decoder));
-
-    stackenv_uninit(&se);
-  }
+  merge_from_string(data, data_len, desc, msg);
 }
 
-PHP_METHOD(Message, jsonEncode) {
-  zval* php_descriptor = get_ce_obj(Z_OBJCE_P(getThis()));
+PHP_METHOD(Message, serializeToJsonString) {
   Descriptor* desc =
-      (Descriptor*)zend_object_store_get_object(php_descriptor TSRMLS_CC);
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(getThis())));
 
   zend_bool preserve_proto_fieldnames = false;
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|b",
@@ -1314,21 +1573,21 @@ PHP_METHOD(Message, jsonEncode) {
 
     putmsg(getThis(), desc, upb_json_printer_input(printer), 0 TSRMLS_CC);
 
-    RETVAL_STRINGL(sink.ptr, sink.len, 1);
+    PHP_PROTO_RETVAL_STRINGL(sink.ptr, sink.len, 1);
 
     stackenv_uninit(&se);
     stringsink_uninit(&sink);
   }
 }
 
-PHP_METHOD(Message, jsonDecode) {
-  zval* php_descriptor = get_ce_obj(Z_OBJCE_P(getThis()));
+PHP_METHOD(Message, mergeFromJsonString) {
   Descriptor* desc =
-      (Descriptor*)zend_object_store_get_object(php_descriptor TSRMLS_CC);
-  MessageHeader* msg = zend_object_store_get_object(getThis() TSRMLS_CC);
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(getThis())));
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
 
   char *data = NULL;
-  int data_len;
+  PHP_PROTO_SIZE data_len;
+
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &data, &data_len) ==
       FAILURE) {
     return;
@@ -1354,3 +1613,103 @@ PHP_METHOD(Message, jsonDecode) {
     stackenv_uninit(&se);
   }
 }
+
+// TODO(teboring): refactoring with putrawmsg
+static void discard_unknown_fields(MessageHeader* msg) {
+  upb_msg_field_iter it;
+
+  stringsink* unknown = DEREF(message_data(msg), 0, stringsink*);
+  if (unknown != NULL) {
+    stringsink_uninit(unknown);
+    FREE(unknown);
+    DEREF(message_data(msg), 0, stringsink*) = NULL;
+  }
+
+  // Recursively discard unknown fields of submessages.
+  Descriptor* desc = msg->descriptor;
+  TSRMLS_FETCH();
+  for (upb_msg_field_begin(&it, desc->msgdef);
+       !upb_msg_field_done(&it);
+       upb_msg_field_next(&it)) {
+    upb_fielddef* f = upb_msg_iter_field(&it);
+    uint32_t offset = desc->layout->fields[upb_fielddef_index(f)].offset;
+    bool containing_oneof = false;
+
+    if (upb_fielddef_containingoneof(f)) {
+      uint32_t oneof_case_offset =
+          desc->layout->fields[upb_fielddef_index(f)].case_offset;
+      // For a oneof, check that this field is actually present -- skip all the
+      // below if not.
+      if (DEREF(message_data(msg), oneof_case_offset, uint32_t) !=
+          upb_fielddef_number(f)) {
+        continue;
+      }
+      // Otherwise, fall through to the appropriate singular-field handler
+      // below.
+      containing_oneof = true;
+    }
+
+    if (is_map_field(f)) {
+      MapIter map_it;
+      int len, size;
+      const upb_fielddef* value_field;
+
+      value_field = map_field_value(f);
+      if (!upb_fielddef_issubmsg(value_field)) continue;
+
+      zval* map_php = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
+      if (map_php == NULL) continue;
+
+      Map* intern = UNBOX(Map, map_php);
+      for (map_begin(map_php, &map_it TSRMLS_CC);
+           !map_done(&map_it); map_next(&map_it)) {
+        upb_value value = map_iter_value(&map_it, &len);
+        void* memory = raw_value(upb_value_memory(&value), value_field);
+#if PHP_MAJOR_VERSION < 7
+        MessageHeader *submsg = UNBOX(MessageHeader, *(zval**)memory);
+#else
+        MessageHeader *submsg =
+            (MessageHeader*)((char*)(Z_OBJ_P((zval*)memory)) -
+                XtOffsetOf(MessageHeader, std));
+#endif
+        discard_unknown_fields(submsg);
+      }
+    } else if (upb_fielddef_isseq(f)) {
+      if (!upb_fielddef_issubmsg(f)) continue;
+
+      zval* array_php = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
+      if (array_php == NULL) continue;
+
+      int size, i;
+      RepeatedField* intern = UNBOX(RepeatedField, array_php);
+      HashTable *ht = PHP_PROTO_HASH_OF(intern->array);
+      size = zend_hash_num_elements(ht);
+      if (size == 0) continue;
+
+      for (i = 0; i < size; i++) {
+        void* memory = repeated_field_index_native(intern, i TSRMLS_CC);
+#if PHP_MAJOR_VERSION < 7
+        MessageHeader *submsg = UNBOX(MessageHeader, *(zval**)memory);
+#else
+        MessageHeader *submsg =
+            (MessageHeader*)((char*)(Z_OBJ_P((zval*)memory)) -
+                XtOffsetOf(MessageHeader, std));
+#endif
+        discard_unknown_fields(submsg);
+      }
+    } else if (upb_fielddef_issubmsg(f)) {
+      zval* submsg_php = CACHED_PTR_TO_ZVAL_PTR(
+          DEREF(message_data(msg), offset, CACHED_VALUE*));
+      if (Z_TYPE_P(submsg_php) == IS_NULL) continue;
+      MessageHeader* submsg = UNBOX(MessageHeader, submsg_php);
+      discard_unknown_fields(submsg);
+    }
+  }
+}
+
+PHP_METHOD(Message, discardUnknownFields) {
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
+  discard_unknown_fields(msg);
+}
diff --git a/php/ext/google/protobuf/map.c b/php/ext/google/protobuf/map.c
index ab98879d..ab8a518a 100644
--- a/php/ext/google/protobuf/map.c
+++ b/php/ext/google/protobuf/map.c
@@ -103,16 +103,16 @@ static bool table_key(Map* self, zval* key,
       *out_length = Z_STRLEN_P(key);
       break;
 
-#define CASE_TYPE(upb_type, type, c_type, php_type)                   \
-  case UPB_TYPE_##upb_type: {                                         \
-    c_type type##_value;                                              \
-    if (!protobuf_convert_to_##type(key, &type##_value)) {            \
-      return false;                                                   \
-    }                                                                 \
-    native_slot_set(self->key_type, NULL, buf, key TSRMLS_CC);        \
-    *out_key = buf;                                                   \
-    *out_length = native_slot_size(self->key_type);                   \
-    break;                                                            \
+#define CASE_TYPE(upb_type, type, c_type, php_type)                     \
+  case UPB_TYPE_##upb_type: {                                           \
+    c_type type##_value;                                                \
+    if (!protobuf_convert_to_##type(key, &type##_value)) {              \
+      return false;                                                     \
+    }                                                                   \
+    native_slot_set_by_array(self->key_type, NULL, buf, key TSRMLS_CC); \
+    *out_key = buf;                                                     \
+    *out_length = native_slot_size(self->key_type);                     \
+    break;                                                              \
   }
       CASE_TYPE(BOOL, bool, int8_t, BOOL)
       CASE_TYPE(INT32, int32, int32_t, LONG)
@@ -143,23 +143,31 @@ static zend_function_entry map_field_methods[] = {
   PHP_ME(MapField, offsetSet,    arginfo_offsetSet, ZEND_ACC_PUBLIC)
   PHP_ME(MapField, offsetUnset,  arginfo_offsetGet, ZEND_ACC_PUBLIC)
   PHP_ME(MapField, count,        arginfo_void,      ZEND_ACC_PUBLIC)
+  PHP_ME(MapField, getIterator,  arginfo_void,      ZEND_ACC_PUBLIC)
   ZEND_FE_END
 };
 
+// Forward declare static functions.
+
+static void map_field_write_dimension(zval *object, zval *key,
+                                      zval *value TSRMLS_DC);
+
 // -----------------------------------------------------------------------------
 // MapField creation/desctruction
 // -----------------------------------------------------------------------------
 
 zend_class_entry* map_field_type;
+zend_class_entry* map_field_iter_type;
+
 zend_object_handlers* map_field_handlers;
+zend_object_handlers* map_field_iter_handlers;
 
 static void map_begin_internal(Map *map, MapIter *iter) {
   iter->self = map;
   upb_strtable_begin(&iter->it, &map->table);
 }
 
-static HashTable *map_field_get_gc(zval *object, zval ***table,
-                                        int *n TSRMLS_DC) {
+static HashTable *map_field_get_gc(zval *object, CACHED_VALUE **table, int *n) {
   // TODO(teboring): Unfortunately, zend engine does not support garbage
   // collection for custom array. We have to use zend engine's native array
   // instead.
@@ -168,91 +176,92 @@ static HashTable *map_field_get_gc(zval *object, zval ***table,
   return NULL;
 }
 
-void map_field_init(TSRMLS_D) {
-  zend_class_entry class_type;
-  const char* class_name = "Google\\Protobuf\\Internal\\MapField";
-  INIT_CLASS_ENTRY_EX(class_type, class_name, strlen(class_name),
-                      map_field_methods);
-
-  map_field_type = zend_register_internal_class(&class_type TSRMLS_CC);
-  map_field_type->create_object = map_field_create;
-
-  zend_class_implements(map_field_type TSRMLS_CC, 2, spl_ce_ArrayAccess,
-                        spl_ce_Countable);
-
-  map_field_handlers = PEMALLOC(zend_object_handlers);
-  memcpy(map_field_handlers, zend_get_std_object_handlers(),
-         sizeof(zend_object_handlers));
-  map_field_handlers->get_gc = map_field_get_gc;
+// Define map value element free function.
+#if PHP_MAJOR_VERSION < 7
+static inline void php_proto_map_string_release(void *value) {
+  zval_ptr_dtor(value);
 }
 
-zend_object_value map_field_create(zend_class_entry *ce TSRMLS_DC) {
-  zend_object_value retval = {0};
-  Map *intern;
-
-  intern = emalloc(sizeof(Map));
-  memset(intern, 0, sizeof(Map));
-
-  zend_object_std_init(&intern->std, ce TSRMLS_CC);
-  object_properties_init(&intern->std, ce);
-
-  // Table value type is always UINT64: this ensures enough space to store the
-  // native_slot value.
-  if (!upb_strtable_init(&intern->table, UPB_CTYPE_UINT64)) {
-    zend_error(E_USER_ERROR, "Could not allocate table.");
+static inline void php_proto_map_object_release(void *value) {
+  zval_ptr_dtor(value);
+}
+#else
+static inline void php_proto_map_string_release(void *value) {
+  zend_string* object = *(zend_string**)value;
+  zend_string_release(object);
+}
+static inline void php_proto_map_object_release(void *value) {
+  zend_object* object = *(zend_object**)value;
+  if(--GC_REFCOUNT(object) == 0) {
+    zend_objects_store_del(object);
   }
-
-  retval.handle = zend_objects_store_put(
-      intern, (zend_objects_store_dtor_t)zend_objects_destroy_object,
-      (zend_objects_free_object_storage_t)map_field_free, NULL TSRMLS_CC);
-  retval.handlers = map_field_handlers;
-
-  return retval;
 }
+#endif
 
-void map_field_free(void *object TSRMLS_DC) {
-  Map *map = (Map *)object;
-
-  switch (map->value_type) {
+// Define object free method.
+PHP_PROTO_OBJECT_FREE_START(Map, map_field)
+MapIter it;
+int len;
+for (map_begin_internal(intern, &it); !map_done(&it); map_next(&it)) {
+  upb_value value = map_iter_value(&it, &len);
+  void *mem = upb_value_memory(&value);
+  switch (intern->value_type) {
     case UPB_TYPE_MESSAGE:
+      php_proto_map_object_release(mem);
+      break;
     case UPB_TYPE_STRING:
-    case UPB_TYPE_BYTES: {
-      MapIter it;
-      int len;
-      for (map_begin_internal(map, &it); !map_done(&it); map_next(&it)) {
-        upb_value value = map_iter_value(&it, &len);
-        void *mem = upb_value_memory(&value);
-        zval_ptr_dtor(mem);
-      }
+    case UPB_TYPE_BYTES:
+      php_proto_map_string_release(mem);
       break;
-    }
     default:
       break;
   }
-
-  upb_strtable_uninit(&map->table);
-  zend_object_std_dtor(&map->std TSRMLS_CC);
-  efree(object);
 }
-
-void map_field_create_with_type(zend_class_entry *ce, const upb_fielddef *field,
-                                zval **map_field TSRMLS_DC) {
-  MAKE_STD_ZVAL(*map_field);
-  Z_TYPE_PP(map_field) = IS_OBJECT;
-  Z_OBJVAL_PP(map_field) =
-      map_field_type->create_object(map_field_type TSRMLS_CC);
-
-  Map* intern =
-      (Map*)zend_object_store_get_object(*map_field TSRMLS_CC);
-
+upb_strtable_uninit(&intern->table);
+PHP_PROTO_OBJECT_FREE_END
+
+PHP_PROTO_OBJECT_DTOR_START(Map, map_field)
+PHP_PROTO_OBJECT_DTOR_END
+
+// Define object create method.
+PHP_PROTO_OBJECT_CREATE_START(Map, map_field)
+// Table value type is always UINT64: this ensures enough space to store the
+// native_slot value.
+if (!upb_strtable_init(&intern->table, UPB_CTYPE_UINT64)) {
+  zend_error(E_USER_ERROR, "Could not allocate table.");
+}
+PHP_PROTO_OBJECT_CREATE_END(Map, map_field)
+
+// Init class entry.
+PHP_PROTO_INIT_CLASS_START("Google\\Protobuf\\Internal\\MapField", Map,
+                           map_field)
+zend_class_implements(map_field_type TSRMLS_CC, 3, spl_ce_ArrayAccess,
+                      zend_ce_aggregate, spl_ce_Countable);
+map_field_handlers->write_dimension = map_field_write_dimension;
+map_field_handlers->get_gc = map_field_get_gc;
+PHP_PROTO_INIT_CLASS_END
+
+void map_field_create_with_field(const zend_class_entry *ce,
+                                 const upb_fielddef *field,
+                                 CACHED_VALUE *map_field PHP_PROTO_TSRMLS_DC) {
   const upb_fielddef *key_field = map_field_key(field);
   const upb_fielddef *value_field = map_field_value(field);
-  intern->key_type = upb_fielddef_type(key_field);
-  intern->value_type = upb_fielddef_type(value_field);
-  intern->msg_ce = field_type_class(value_field TSRMLS_CC);
+  map_field_create_with_type(
+      ce, upb_fielddef_type(key_field), upb_fielddef_type(value_field),
+      field_type_class(value_field TSRMLS_CC), map_field PHP_PROTO_TSRMLS_CC);
 }
 
-static void map_field_free_element(void *object) {
+void map_field_create_with_type(const zend_class_entry *ce,
+                                upb_fieldtype_t key_type,
+                                upb_fieldtype_t value_type,
+                                const zend_class_entry *msg_ce,
+                                CACHED_VALUE *map_field PHP_PROTO_TSRMLS_DC) {
+  CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(CACHED_PTR_TO_ZVAL_PTR(map_field),
+                                   map_field_type);
+  Map *intern = UNBOX(Map, CACHED_TO_ZVAL_PTR(*map_field));
+  intern->key_type = key_type;
+  intern->value_type = value_type;
+  intern->msg_ce = msg_ce;
 }
 
 // -----------------------------------------------------------------------------
@@ -260,9 +269,8 @@ static void map_field_free_element(void *object) {
 // -----------------------------------------------------------------------------
 
 static bool map_field_read_dimension(zval *object, zval *key, int type,
-                                     zval **retval TSRMLS_DC) {
-  Map *intern =
-      (Map *)zend_object_store_get_object(object TSRMLS_CC);
+                                     CACHED_VALUE *retval TSRMLS_DC) {
+  Map *intern = UNBOX(Map, object);
 
   char keybuf[TABLE_KEY_BUF_LENGTH];
   const char* keyval = NULL;
@@ -277,7 +285,7 @@ static bool map_field_read_dimension(zval *object, zval *key, int type,
 
   if (upb_strtable_lookup2(&intern->table, keyval, length, &v)) {
     void* mem = upb_value_memory(&v);
-    native_slot_get(intern->value_type, mem, retval TSRMLS_CC);
+    native_slot_get_by_map_value(intern->value_type, mem, retval TSRMLS_CC);
     return true;
   } else {
     zend_error(E_USER_ERROR, "Given key doesn't exist.");
@@ -285,19 +293,52 @@ static bool map_field_read_dimension(zval *object, zval *key, int type,
   }
 }
 
+static bool map_index_unset(Map *intern, const char* keyval, int length) {
+  upb_value old_value;
+  if (upb_strtable_remove2(&intern->table, keyval, length, &old_value)) {
+    switch (intern->value_type) {
+      case UPB_TYPE_MESSAGE: {
+#if PHP_MAJOR_VERSION < 7
+        zval_ptr_dtor(upb_value_memory(&old_value));
+#else
+        zend_object* object = *(zend_object**)upb_value_memory(&old_value);
+        if(--GC_REFCOUNT(object) == 0) {
+          zend_objects_store_del(object);
+        }
+#endif
+        break;
+      }
+      case UPB_TYPE_STRING:
+      case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
+        zval_ptr_dtor(upb_value_memory(&old_value));
+#else
+        zend_string* object = *(zend_string**)upb_value_memory(&old_value);
+        zend_string_release(object);
+#endif
+        break;
+      }
+      default:
+        break;
+    }
+  }
+}
+
 bool map_index_set(Map *intern, const char* keyval, int length, upb_value v) {
   // Replace any existing value by issuing a 'remove' operation first.
-  upb_strtable_remove2(&intern->table, keyval, length, NULL);
+  map_index_unset(intern, keyval, length);
+
   if (!upb_strtable_insert2(&intern->table, keyval, length, v)) {
     zend_error(E_USER_ERROR, "Could not insert into table");
     return false;
   }
+
   return true;
 }
 
-static bool map_field_write_dimension(zval *object, zval *key,
+static void map_field_write_dimension(zval *object, zval *key,
                                       zval *value TSRMLS_DC) {
-  Map *intern = (Map *)zend_object_store_get_object(object TSRMLS_CC);
+  Map *intern = UNBOX(Map, object);
 
   char keybuf[TABLE_KEY_BUF_LENGTH];
   const char* keyval = NULL;
@@ -305,31 +346,24 @@ static bool map_field_write_dimension(zval *object, zval *key,
   upb_value v;
   void* mem;
   if (!table_key(intern, key, keybuf, &keyval, &length TSRMLS_CC)) {
-    return false;
+    return;
   }
 
   mem = upb_value_memory(&v);
   memset(mem, 0, native_slot_size(intern->value_type));
-  if (!native_slot_set(intern->value_type, intern->msg_ce, mem,
-                       value TSRMLS_CC)) {
-    return false;
+  if (!native_slot_set_by_map(intern->value_type, intern->msg_ce, mem,
+                                value TSRMLS_CC)) {
+    return;
   }
 #ifndef NDEBUG
   v.ctype = UPB_CTYPE_UINT64;
 #endif
 
-  // Replace any existing value by issuing a 'remove' operation first.
-  upb_strtable_remove2(&intern->table, keyval, length, NULL);
-  if (!upb_strtable_insert2(&intern->table, keyval, length, v)) {
-    zend_error(E_USER_ERROR, "Could not insert into table");
-    return false;
-  }
-
-  return true;
+  map_index_set(intern, keyval, length, v);
 }
 
 static bool map_field_unset_dimension(zval *object, zval *key TSRMLS_DC) {
-  Map *intern = (Map *)zend_object_store_get_object(object TSRMLS_CC);
+  Map *intern = UNBOX(Map, object);
 
   char keybuf[TABLE_KEY_BUF_LENGTH];
   const char* keyval = NULL;
@@ -342,7 +376,7 @@ static bool map_field_unset_dimension(zval *object, zval *key TSRMLS_DC) {
   v.ctype = UPB_CTYPE_UINT64;
 #endif
 
-  upb_strtable_remove2(&intern->table, keyval, length, &v);
+  map_index_unset(intern, keyval, length);
 
   return true;
 }
@@ -360,8 +394,7 @@ PHP_METHOD(MapField, __construct) {
     return;
   }
 
-  Map* intern =
-      (Map*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  Map *intern = UNBOX(Map, getThis());
   intern->key_type = to_fieldtype(key_type);
   intern->value_type = to_fieldtype(value_type);
   intern->msg_ce = klass;
@@ -389,7 +422,7 @@ PHP_METHOD(MapField, offsetExists) {
     return;
   }
 
-  Map *intern = (Map *)zend_object_store_get_object(getThis() TSRMLS_CC);
+  Map *intern = UNBOX(Map, getThis());
 
   char keybuf[TABLE_KEY_BUF_LENGTH];
   const char* keyval = NULL;
@@ -412,7 +445,7 @@ PHP_METHOD(MapField, offsetGet) {
     return;
   }
   map_field_read_dimension(getThis(), index, BP_VAR_R,
-                           return_value_ptr TSRMLS_CC);
+                           ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
 }
 
 PHP_METHOD(MapField, offsetSet) {
@@ -434,8 +467,7 @@ PHP_METHOD(MapField, offsetUnset) {
 }
 
 PHP_METHOD(MapField, count) {
-  Map *intern =
-      (Map *)zend_object_store_get_object(getThis() TSRMLS_CC);
+  Map *intern = UNBOX(Map, getThis());
 
   if (zend_parse_parameters_none() == FAILURE) {
     return;
@@ -444,6 +476,15 @@ PHP_METHOD(MapField, count) {
   RETURN_LONG(upb_strtable_count(&intern->table));
 }
 
+PHP_METHOD(MapField, getIterator) {
+  CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(return_value,
+                                   map_field_iter_type);
+
+  Map *intern = UNBOX(Map, getThis());
+  MapIter *iter = UNBOX(MapIter, return_value);
+  map_begin(getThis(), iter TSRMLS_CC);
+}
+
 // -----------------------------------------------------------------------------
 // Map Iterator
 // -----------------------------------------------------------------------------
@@ -470,3 +511,79 @@ upb_value map_iter_value(MapIter *iter, int *len) {
   *len = native_slot_size(iter->self->value_type);
   return upb_strtable_iter_value(&iter->it);
 }
+
+// -----------------------------------------------------------------------------
+// MapFieldIter methods
+// -----------------------------------------------------------------------------
+static zend_function_entry map_field_iter_methods[] = {
+  PHP_ME(MapFieldIter, rewind,      arginfo_void, ZEND_ACC_PUBLIC)
+  PHP_ME(MapFieldIter, current,     arginfo_void, ZEND_ACC_PUBLIC)
+  PHP_ME(MapFieldIter, key,         arginfo_void, ZEND_ACC_PUBLIC)
+  PHP_ME(MapFieldIter, next,        arginfo_void, ZEND_ACC_PUBLIC)
+  PHP_ME(MapFieldIter, valid,       arginfo_void, ZEND_ACC_PUBLIC)
+  ZEND_FE_END
+};
+
+// -----------------------------------------------------------------------------
+// MapFieldIter creation/desctruction
+// -----------------------------------------------------------------------------
+
+// Define object free method.
+PHP_PROTO_OBJECT_FREE_START(MapIter, map_field_iter)
+PHP_PROTO_OBJECT_FREE_END
+
+PHP_PROTO_OBJECT_DTOR_START(MapIter, map_field_iter)
+PHP_PROTO_OBJECT_DTOR_END
+
+// Define object create method.
+PHP_PROTO_OBJECT_CREATE_START(MapIter, map_field_iter)
+intern->self = NULL;
+PHP_PROTO_OBJECT_CREATE_END(MapIter, map_field_iter)
+
+// Init class entry.
+PHP_PROTO_INIT_CLASS_START("Google\\Protobuf\\Internal\\MapFieldIter",
+                           MapIter, map_field_iter)
+zend_class_implements(map_field_iter_type TSRMLS_CC, 1, zend_ce_iterator);
+PHP_PROTO_INIT_CLASS_END
+
+// -----------------------------------------------------------------------------
+// PHP MapFieldIter Methods
+// -----------------------------------------------------------------------------
+
+PHP_METHOD(MapFieldIter, rewind) {
+  MapIter *intern = UNBOX(MapIter, getThis());
+  map_begin_internal(intern->self, intern);
+}
+
+PHP_METHOD(MapFieldIter, current) {
+  MapIter *intern = UNBOX(MapIter, getThis());
+  Map *map_field = intern->self;
+
+  int value_length = 0;
+  upb_value value = map_iter_value(intern, &value_length);
+
+  void* mem = upb_value_memory(&value);
+  native_slot_get_by_map_value(map_field->value_type, mem,
+                               ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
+}
+
+PHP_METHOD(MapFieldIter, key) {
+  MapIter *intern = UNBOX(MapIter, getThis());
+  Map *map_field = intern->self;
+
+  int key_length = 0;
+  const char* key = map_iter_key(intern, &key_length);
+
+  native_slot_get_by_map_key(map_field->key_type, key, key_length,
+                             ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
+}
+
+PHP_METHOD(MapFieldIter, next) {
+  MapIter *intern = UNBOX(MapIter, getThis());
+  map_next(intern);
+}
+
+PHP_METHOD(MapFieldIter, valid) {
+  MapIter *intern = UNBOX(MapIter, getThis());
+  RETURN_BOOL(!map_done(intern));
+}
diff --git a/php/ext/google/protobuf/message.c b/php/ext/google/protobuf/message.c
index 59ce6ae6..e28e42a1 100644
--- a/php/ext/google/protobuf/message.c
+++ b/php/ext/google/protobuf/message.c
@@ -30,19 +30,22 @@
 
 #include <php.h>
 #include <stdlib.h>
-#include <ext/json/php_json.h>
 
 #include "protobuf.h"
+#include "utf8.h"
 
-static zend_class_entry* message_type;
+zend_class_entry* message_type;
 zend_object_handlers* message_handlers;
+static const char TYPE_URL_PREFIX[] = "type.googleapis.com/";
+static void hex_to_binary(const char* hex, char** binary, int* binary_len);
 
 static  zend_function_entry message_methods[] = {
   PHP_ME(Message, clear, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Message, discardUnknownFields, NULL, ZEND_ACC_PUBLIC)
   PHP_ME(Message, serializeToString, NULL, ZEND_ACC_PUBLIC)
   PHP_ME(Message, mergeFromString, NULL, ZEND_ACC_PUBLIC)
-  PHP_ME(Message, jsonEncode, NULL, ZEND_ACC_PUBLIC)
-  PHP_ME(Message, jsonDecode, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Message, serializeToJsonString, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Message, mergeFromJsonString, NULL, ZEND_ACC_PUBLIC)
   PHP_ME(Message, mergeFrom, NULL, ZEND_ACC_PUBLIC)
   PHP_ME(Message, readOneof, NULL, ZEND_ACC_PROTECTED)
   PHP_ME(Message, writeOneof, NULL, ZEND_ACC_PROTECTED)
@@ -53,172 +56,212 @@ static  zend_function_entry message_methods[] = {
 
 // Forward declare static functions.
 
+#if PHP_MAJOR_VERSION < 7
 static void message_set_property(zval* object, zval* member, zval* value,
-                                 const zend_literal* key TSRMLS_DC);
+                                 php_proto_zend_literal key TSRMLS_DC);
 static zval* message_get_property(zval* object, zval* member, int type,
                                   const zend_literal* key TSRMLS_DC);
 static zval** message_get_property_ptr_ptr(zval* object, zval* member, int type,
-                                           const zend_literal* key TSRMLS_DC);
-static HashTable* message_get_properties(zval* object TSRMLS_DC);
+                                           php_proto_zend_literal key TSRMLS_DC);
 static HashTable* message_get_gc(zval* object, zval*** table, int* n TSRMLS_DC);
-
-static zend_object_value message_create(zend_class_entry* ce TSRMLS_DC);
-static void message_free(void* object TSRMLS_DC);
+#else
+static void message_set_property(zval* object, zval* member, zval* value,
+                                 void** cache_slot);
+static zval* message_get_property(zval* object, zval* member, int type,
+                                  void** cache_slot, zval* rv);
+static zval* message_get_property_ptr_ptr(zval* object, zval* member, int type,
+                                          void** cache_slot);
+static HashTable* message_get_gc(zval* object, zval** table, int* n);
+#endif
+static HashTable* message_get_properties(zval* object TSRMLS_DC);
 
 // -----------------------------------------------------------------------------
 // PHP Message Handlers
 // -----------------------------------------------------------------------------
 
-void message_init(TSRMLS_D) {
-  zend_class_entry class_type;
-  INIT_CLASS_ENTRY(class_type, "Google\\Protobuf\\Internal\\Message",
-                   message_methods);
-  message_type = zend_register_internal_class(&class_type TSRMLS_CC);
-
-  message_handlers = PEMALLOC(zend_object_handlers);
-  memcpy(message_handlers, zend_get_std_object_handlers(),
-         sizeof(zend_object_handlers));
+// Define object free method.
+PHP_PROTO_OBJECT_FREE_START(MessageHeader, message)
+  if (*(void**)intern->data != NULL) {
+    stringsink_uninit(*(void**)intern->data);
+    FREE(*(void**)intern->data);
+  }
+  FREE(intern->data);
+PHP_PROTO_OBJECT_FREE_END
+
+PHP_PROTO_OBJECT_DTOR_START(MessageHeader, message)
+PHP_PROTO_OBJECT_DTOR_END
+
+// Define object create method.
+PHP_PROTO_OBJECT_CREATE_START(MessageHeader, message)
+// Because php call this create func before calling the sub-message's
+// constructor defined in PHP, it's possible that the decriptor of this class
+// hasn't been added to descritpor pool (when the class is first
+// instantiated). In that case, we will defer the initialization of the custom
+// data to the parent Message's constructor, which will be called by
+// sub-message's constructors after the descriptor has been added.
+PHP_PROTO_OBJECT_CREATE_END(MessageHeader, message)
+
+// Init class entry.
+PHP_PROTO_INIT_CLASS_START("Google\\Protobuf\\Internal\\Message",
+                           MessageHeader, message)
   message_handlers->write_property = message_set_property;
   message_handlers->read_property = message_get_property;
   message_handlers->get_property_ptr_ptr = message_get_property_ptr_ptr;
   message_handlers->get_properties = message_get_properties;
   message_handlers->get_gc = message_get_gc;
+PHP_PROTO_INIT_CLASS_END
+
+static void message_set_property_internal(zval* object, zval* member,
+                                          zval* value TSRMLS_DC) {
+  const upb_fielddef* field;
+
+  MessageHeader* self = UNBOX(MessageHeader, object);
+
+  field = upb_msgdef_ntofz(self->descriptor->msgdef, Z_STRVAL_P(member));
+  if (field == NULL) {
+    zend_error(E_USER_ERROR, "Unknown field: %s", Z_STRVAL_P(member));
+  }
+
+  layout_set(self->descriptor->layout, self, field, value TSRMLS_CC);
 }
 
+#if PHP_MAJOR_VERSION < 7
 static void message_set_property(zval* object, zval* member, zval* value,
-                                 const zend_literal* key TSRMLS_DC) {
+                                 php_proto_zend_literal key TSRMLS_DC) {
+#else
+static void message_set_property(zval* object, zval* member, zval* value,
+                                 void** cache_slot) {
+#endif
   if (Z_TYPE_P(member) != IS_STRING) {
     zend_error(E_USER_ERROR, "Unexpected type for field name");
     return;
   }
 
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
   if (Z_OBJCE_P(object) != EG(scope)) {
+#else
+  if (Z_OBJCE_P(object) != zend_get_executed_scope()) {
+#endif
     // User cannot set property directly (e.g., $m->a = 1)
     zend_error(E_USER_ERROR, "Cannot access private property.");
     return;
   }
 
+  message_set_property_internal(object, member, value TSRMLS_CC);
+}
+
+static zval* message_get_property_internal(zval* object,
+                                           zval* member TSRMLS_DC) {
+  MessageHeader* self = UNBOX(MessageHeader, object);
   const upb_fielddef* field;
+  field = upb_msgdef_ntofz(self->descriptor->msgdef, Z_STRVAL_P(member));
+  if (field == NULL) {
+    return PHP_PROTO_GLOBAL_UNINITIALIZED_ZVAL;
+  }
 
-  MessageHeader* self = zend_object_store_get_object(object TSRMLS_CC);
+  zend_property_info* property_info;
+#if PHP_MAJOR_VERSION < 7
+  property_info =
+      zend_get_property_info(Z_OBJCE_P(object), member, true TSRMLS_CC);
+#else
+  property_info =
+      zend_get_property_info(Z_OBJCE_P(object), Z_STR_P(member), true);
+#endif
+  return layout_get(
+      self->descriptor->layout, message_data(self), field,
+      OBJ_PROP(Z_OBJ_P(object), property_info->offset) TSRMLS_CC);
+}
 
+static void message_get_oneof_property_internal(zval* object, zval* member,
+                                                zval* return_value TSRMLS_DC) {
+  MessageHeader* self = UNBOX(MessageHeader, object);
+  const upb_fielddef* field;
   field = upb_msgdef_ntofz(self->descriptor->msgdef, Z_STRVAL_P(member));
   if (field == NULL) {
-    zend_error(E_USER_ERROR, "Unknown field: %s", Z_STRVAL_P(member));
+    return;
   }
 
-  layout_set(self->descriptor->layout, self, field, value TSRMLS_CC);
+  layout_get(self->descriptor->layout, message_data(self), field,
+             ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
 }
 
+#if PHP_MAJOR_VERSION < 7
 static zval* message_get_property(zval* object, zval* member, int type,
                                   const zend_literal* key TSRMLS_DC) {
+#else
+static zval* message_get_property(zval* object, zval* member, int type,
+                                  void** cache_slot, zval* rv) {
+#endif
   if (Z_TYPE_P(member) != IS_STRING) {
     zend_error(E_USER_ERROR, "Property name has to be a string.");
-    return EG(uninitialized_zval_ptr);
+    return PHP_PROTO_GLOBAL_UNINITIALIZED_ZVAL;
   }
 
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
   if (Z_OBJCE_P(object) != EG(scope)) {
+#else
+  if (Z_OBJCE_P(object) != zend_get_executed_scope()) {
+#endif
     // User cannot get property directly (e.g., $a = $m->a)
     zend_error(E_USER_ERROR, "Cannot access private property.");
-    return EG(uninitialized_zval_ptr);
-  }
-
-  zend_property_info* property_info = NULL;
-
-  // All properties should have been declared in the generated code and have
-  // corresponding zvals in properties_table.
-  ulong h = zend_get_hash_value(Z_STRVAL_P(member), Z_STRLEN_P(member) + 1);
-  if (zend_hash_quick_find(&Z_OBJCE_P(object)->properties_info,
-                           Z_STRVAL_P(member), Z_STRLEN_P(member) + 1, h,
-                           (void**)&property_info) != SUCCESS) {
-    zend_error(E_USER_ERROR, "Property does not exist.");
-    return EG(uninitialized_zval_ptr);
+    return PHP_PROTO_GLOBAL_UNINITIALIZED_ZVAL;
   }
 
-  MessageHeader* self =
-      (MessageHeader*)zend_object_store_get_object(object TSRMLS_CC);
-
-  const upb_fielddef* field;
-  field = upb_msgdef_ntofz(self->descriptor->msgdef, Z_STRVAL_P(member));
-  if (field == NULL) {
-    return EG(uninitialized_zval_ptr);
-  }
-  return layout_get(
-      self->descriptor->layout, message_data(self), field,
-      &Z_OBJ_P(object)->properties_table[property_info->offset] TSRMLS_CC);
+  return message_get_property_internal(object, member TSRMLS_CC);
 }
 
+#if PHP_MAJOR_VERSION < 7
 static zval** message_get_property_ptr_ptr(zval* object, zval* member, int type,
-                                           const zend_literal* key TSRMLS_DC) {
+                                           php_proto_zend_literal key
+                                               TSRMLS_DC) {
+#else
+static zval* message_get_property_ptr_ptr(zval* object, zval* member, int type,
+                                          void** cache_slot) {
+#endif
   return NULL;
 }
 
 static HashTable* message_get_properties(zval* object TSRMLS_DC) {
-  return NULL;
+  // User cannot get property directly (e.g., $a = $m->a)
+  zend_error(E_USER_ERROR, "Cannot access private properties.");
+#if PHP_MAJOR_VERSION < 7
+  return zend_std_get_properties(object TSRMLS_CC);
+#else
+  return zend_std_get_properties(object);
+#endif
 }
 
-static HashTable* message_get_gc(zval* object, zval*** table, int* n TSRMLS_DC) {
-    zend_object* zobj = Z_OBJ_P(object);
-    *table = zobj->properties_table;
-    *n = zobj->ce->default_properties_count;
-    return NULL;
+static HashTable* message_get_gc(zval* object, CACHED_VALUE** table,
+                                 int* n TSRMLS_DC) {
+  zend_object* zobj = Z_OBJ_P(object);
+  *table = zobj->properties_table;
+  *n = zobj->ce->default_properties_count;
+  return NULL;
 }
 
 // -----------------------------------------------------------------------------
 // C Message Utilities
 // -----------------------------------------------------------------------------
 
-void* message_data(void* msg) {
-  return ((uint8_t*)msg) + sizeof(MessageHeader);
+void* message_data(MessageHeader* msg) {
+  return msg->data;
 }
 
-static void message_free(void* object TSRMLS_DC) {
-  MessageHeader* msg = (MessageHeader*)object;
-  int i;
-
-  for (i = 0; i < msg->std.ce->default_properties_count; i++) {
-    zval_ptr_dtor(&msg->std.properties_table[i]);
-  }
-  efree(msg->std.properties_table);
-  efree(msg);
-}
-
-static zend_object_value message_create(zend_class_entry* ce TSRMLS_DC) {
-  zend_object_value return_value;
-
-  zval* php_descriptor = get_ce_obj(ce);
-
-  Descriptor* desc = zend_object_store_get_object(php_descriptor TSRMLS_CC);
-  MessageHeader* msg = (MessageHeader*)ALLOC_N(
-      uint8_t, sizeof(MessageHeader) + desc->layout->size);
-  memset(message_data(msg), 0, desc->layout->size);
-
+void custom_data_init(const zend_class_entry* ce,
+                      MessageHeader* intern PHP_PROTO_TSRMLS_DC) {
+  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(ce));
+  intern->data = ALLOC_N(uint8_t, desc->layout->size);
+  memset(message_data(intern), 0, desc->layout->size);
   // We wrap first so that everything in the message object is GC-rooted in
   // case a collection happens during object creation in layout_init().
-  msg->descriptor = desc;
-
-  zend_object_std_init(&msg->std, ce TSRMLS_CC);
-  object_properties_init(&msg->std, ce);
-  layout_init(desc->layout, message_data(msg),
-              msg->std.properties_table TSRMLS_CC);
-
-  return_value.handle = zend_objects_store_put(
-      msg, (zend_objects_store_dtor_t)zend_objects_destroy_object, message_free,
-      NULL TSRMLS_CC);
-
-  return_value.handlers = message_handlers;
-  return return_value;
+  intern->descriptor = desc;
+  layout_init(desc->layout, message_data(intern),
+              &intern->std PHP_PROTO_TSRMLS_CC);
 }
 
-void message_create_with_type(zend_class_entry* ce, zval** message TSRMLS_DC) {
-  MAKE_STD_ZVAL(*message);
-  Z_TYPE_PP(message) = IS_OBJECT;
-  Z_OBJVAL_PP(message) = ce->create_object(ce TSRMLS_CC);
-  Z_DELREF_PP(message);
-}
-
-void build_class_from_descriptor(zval* php_descriptor TSRMLS_DC) {
-  Descriptor* desc = UNBOX(Descriptor, php_descriptor);
+void build_class_from_descriptor(
+    PHP_PROTO_HASHTABLE_VALUE php_descriptor TSRMLS_DC) {
+  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, php_descriptor);
 
   // Map entries don't have existing php class.
   if (upb_msgdef_mapentry(desc->msgdef)) {
@@ -239,33 +282,129 @@ void build_class_from_descriptor(zval* php_descriptor TSRMLS_DC) {
 // PHP Methods
 // -----------------------------------------------------------------------------
 
+void Message_construct(zval* msg, zval* array_wrapper) {
+  zend_class_entry* ce = Z_OBJCE_P(msg);
+  MessageHeader* intern = NULL;
+  if (EXPECTED(class_added(ce))) {
+    intern = UNBOX(MessageHeader, msg);
+    custom_data_init(ce, intern PHP_PROTO_TSRMLS_CC);
+  }
+
+  if (array_wrapper == NULL) {
+    return;
+  }
+
+  HashTable* array = Z_ARRVAL_P(array_wrapper);
+  HashPosition pointer;
+  zval key;
+  void* value;
+  const upb_fielddef* field;
+
+  for (zend_hash_internal_pointer_reset_ex(array, &pointer);
+       php_proto_zend_hash_get_current_data_ex(array, (void**)&value,
+                                               &pointer) == SUCCESS;
+       zend_hash_move_forward_ex(array, &pointer)) {
+    zend_hash_get_current_key_zval_ex(array, &key, &pointer);
+    field = upb_msgdef_ntofz(intern->descriptor->msgdef, Z_STRVAL_P(&key));
+    if (field == NULL) {
+      zend_error(E_USER_ERROR, "Unknown field: %s", Z_STRVAL_P(&key));
+    }
+    if (upb_fielddef_ismap(field)) {
+      PHP_PROTO_FAKE_SCOPE_BEGIN(Z_OBJCE_P(msg));
+      zval* submap = message_get_property_internal(msg, &key TSRMLS_CC);
+      PHP_PROTO_FAKE_SCOPE_END;
+      HashTable* subtable = HASH_OF(
+          CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)value));
+      HashPosition subpointer;
+      zval subkey;
+      void* memory;
+      for (zend_hash_internal_pointer_reset_ex(subtable, &subpointer);
+           php_proto_zend_hash_get_current_data_ex(subtable, (void**)&memory,
+                                                   &subpointer) == SUCCESS;
+           zend_hash_move_forward_ex(subtable, &subpointer)) {
+        zend_hash_get_current_key_zval_ex(subtable, &subkey, &subpointer);
+        map_field_handlers->write_dimension(
+            submap, &subkey,
+            CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory) TSRMLS_CC);
+        zval_dtor(&subkey);
+      }
+    } else if (upb_fielddef_isseq(field)) {
+      PHP_PROTO_FAKE_SCOPE_BEGIN(Z_OBJCE_P(msg));
+      zval* subarray = message_get_property_internal(msg, &key TSRMLS_CC);
+      PHP_PROTO_FAKE_SCOPE_END;
+      HashTable* subtable = HASH_OF(
+          CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)value));
+      HashPosition subpointer;
+      void* memory;
+      for (zend_hash_internal_pointer_reset_ex(subtable, &subpointer);
+           php_proto_zend_hash_get_current_data_ex(subtable, (void**)&memory,
+                                                   &subpointer) == SUCCESS;
+           zend_hash_move_forward_ex(subtable, &subpointer)) {
+        repeated_field_handlers->write_dimension(
+            subarray, NULL,
+            CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory) TSRMLS_CC);
+      }
+    } else if (upb_fielddef_issubmsg(field)) {
+      const upb_msgdef* submsgdef = upb_fielddef_msgsubdef(field);
+      PHP_PROTO_HASHTABLE_VALUE desc_php = get_def_obj(submsgdef);
+      Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, desc_php);
+      zend_property_info* property_info;
+      PHP_PROTO_FAKE_SCOPE_BEGIN(Z_OBJCE_P(msg));
+#if PHP_MAJOR_VERSION < 7
+      property_info =
+          zend_get_property_info(Z_OBJCE_P(msg), &key, true TSRMLS_CC);
+#else
+      property_info =
+          zend_get_property_info(Z_OBJCE_P(msg), Z_STR_P(&key), true);
+#endif
+      PHP_PROTO_FAKE_SCOPE_END;
+      CACHED_VALUE* cached = OBJ_PROP(Z_OBJ_P(msg), property_info->offset);
+#if PHP_MAJOR_VERSION < 7
+      SEPARATE_ZVAL_IF_NOT_REF(cached);
+#endif
+      zval* submsg = CACHED_PTR_TO_ZVAL_PTR(cached);
+      ZVAL_OBJ(submsg, desc->klass->create_object(desc->klass TSRMLS_CC));
+      Message_construct(submsg, NULL);
+      MessageHeader* from = UNBOX(MessageHeader,
+                                  CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)value));
+      MessageHeader* to = UNBOX(MessageHeader, submsg);
+      if(from->descriptor != to->descriptor) {
+        zend_error(E_USER_ERROR, "Cannot merge messages with different class.");
+        return;
+      }
+
+      layout_merge(from->descriptor->layout, from, to TSRMLS_CC);
+    } else {
+      message_set_property_internal(msg, &key,
+          CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)value) TSRMLS_CC);
+    }
+    zval_dtor(&key);
+  }
+}
+
 // At the first time the message is created, the class entry hasn't been
 // modified. As a result, the first created instance will be a normal zend
 // object. Here, we manually modify it to our message in such a case.
 PHP_METHOD(Message, __construct) {
-  if (Z_OBJVAL_P(getThis()).handlers != message_handlers) {
-    zend_class_entry* ce = Z_OBJCE_P(getThis());
-    zval_dtor(getThis());
-    Z_OBJVAL_P(getThis()) = message_create(ce TSRMLS_CC);
+  // Init message with array
+  zval* array_wrapper = NULL;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,
+                            "|a!", &array_wrapper) == FAILURE) {
+    return;
   }
+
+  Message_construct(getThis(), array_wrapper);
 }
 
 PHP_METHOD(Message, clear) {
-  MessageHeader* msg =
-      (MessageHeader*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
   Descriptor* desc = msg->descriptor;
   zend_class_entry* ce = desc->klass;
-  int i;
 
-  for (i = 0; i < msg->std.ce->default_properties_count; i++) {
-    zval_ptr_dtor(&msg->std.properties_table[i]);
-  }
-  efree(msg->std.properties_table);
-
-  zend_object_std_init(&msg->std, ce TSRMLS_CC);
+  zend_object_std_dtor(&msg->std TSRMLS_CC);
   object_properties_init(&msg->std, ce);
-  layout_init(desc->layout, message_data(msg),
-              msg->std.properties_table TSRMLS_CC);
+
+  layout_init(desc->layout, message_data(msg), &msg->std TSRMLS_CC);
 }
 
 PHP_METHOD(Message, mergeFrom) {
@@ -275,10 +414,8 @@ PHP_METHOD(Message, mergeFrom) {
     return;
   }
 
-  MessageHeader* from =
-      (MessageHeader*)zend_object_store_get_object(value TSRMLS_CC);
-  MessageHeader* to =
-      (MessageHeader*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  MessageHeader* from = UNBOX(MessageHeader, value);
+  MessageHeader* to = UNBOX(MessageHeader, getThis());
 
   if(from->descriptor != to->descriptor) {
     zend_error(E_USER_ERROR, "Cannot merge messages with different class.");
@@ -289,36 +426,33 @@ PHP_METHOD(Message, mergeFrom) {
 }
 
 PHP_METHOD(Message, readOneof) {
-  long index;
+  PHP_PROTO_LONG index;
 
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &index) ==
       FAILURE) {
     return;
   }
 
-  MessageHeader* msg =
-      (MessageHeader*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
 
   const upb_fielddef* field = upb_msgdef_itof(msg->descriptor->msgdef, index);
 
-  int property_cache_index =
-      msg->descriptor->layout->fields[upb_fielddef_index(field)].cache_index;
-  zval** cache_ptr = &(msg->std.properties_table)[property_cache_index];
-
+  // Unlike singular fields, oneof fields share cached property. So we cannot
+  // let lay_get modify the cached property. Instead, we pass in the return
+  // value directly.
   layout_get(msg->descriptor->layout, message_data(msg), field,
-             &return_value TSRMLS_CC);
+             ZVAL_PTR_TO_CACHED_PTR(return_value) TSRMLS_CC);
 }
 
 PHP_METHOD(Message, writeOneof) {
-  long index;
+  PHP_PROTO_LONG index;
   zval* value;
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "lz", &index, &value) ==
       FAILURE) {
     return;
   }
 
-  MessageHeader* msg =
-      (MessageHeader*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
 
   const upb_fielddef* field = upb_msgdef_itof(msg->descriptor->msgdef, index);
 
@@ -327,19 +461,1775 @@ PHP_METHOD(Message, writeOneof) {
 
 PHP_METHOD(Message, whichOneof) {
   char* oneof_name;
-  int length;
+  PHP_PROTO_SIZE length;
 
   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &oneof_name,
                             &length) == FAILURE) {
     return;
   }
 
-  MessageHeader* msg =
-      (MessageHeader*)zend_object_store_get_object(getThis() TSRMLS_CC);
+  MessageHeader* msg = UNBOX(MessageHeader, getThis());
 
   const upb_oneofdef* oneof =
       upb_msgdef_ntoo(msg->descriptor->msgdef, oneof_name, length);
   const char* oneof_case_name = layout_get_oneof_case(
       msg->descriptor->layout, message_data(msg), oneof TSRMLS_CC);
-  RETURN_STRING(oneof_case_name, 1);
+  PHP_PROTO_RETURN_STRING(oneof_case_name, 1);
+}
+
+// -----------------------------------------------------------------------------
+// Well Known Types Support
+// -----------------------------------------------------------------------------
+
+#define PHP_PROTO_FIELD_ACCESSORS(UPPER_CLASS, LOWER_CLASS, UPPER_FIELD,       \
+                                  LOWER_FIELD)                                 \
+  PHP_METHOD(UPPER_CLASS, get##UPPER_FIELD) {                                  \
+    zval member;                                                               \
+    PHP_PROTO_ZVAL_STRING(&member, LOWER_FIELD, 1);                            \
+    PHP_PROTO_FAKE_SCOPE_BEGIN(LOWER_CLASS##_type);                            \
+    zval* value = message_get_property_internal(getThis(), &member TSRMLS_CC); \
+    PHP_PROTO_FAKE_SCOPE_END;                                                  \
+    zval_dtor(&member);                                                        \
+    PHP_PROTO_RETVAL_ZVAL(value);                                              \
+  }                                                                            \
+  PHP_METHOD(UPPER_CLASS, set##UPPER_FIELD) {                                  \
+    zval* value = NULL;                                                        \
+    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &value) ==       \
+        FAILURE) {                                                             \
+      return;                                                                  \
+    }                                                                          \
+    zval member;                                                               \
+    PHP_PROTO_ZVAL_STRING(&member, LOWER_FIELD, 1);                            \
+    message_set_property_internal(getThis(), &member, value TSRMLS_CC);        \
+    zval_dtor(&member);                                                        \
+    PHP_PROTO_RETVAL_ZVAL(getThis());                                          \
+  }
+
+#define PHP_PROTO_ONEOF_FIELD_ACCESSORS(UPPER_CLASS, LOWER_CLASS, UPPER_FIELD, \
+                                        LOWER_FIELD)                           \
+  PHP_METHOD(UPPER_CLASS, get##UPPER_FIELD) {                                  \
+    zval member;                                                               \
+    PHP_PROTO_ZVAL_STRING(&member, LOWER_FIELD, 1);                            \
+    PHP_PROTO_FAKE_SCOPE_BEGIN(LOWER_CLASS##_type);                            \
+    message_get_oneof_property_internal(getThis(), &member,                    \
+                                        return_value TSRMLS_CC);               \
+    PHP_PROTO_FAKE_SCOPE_END;                                                  \
+    zval_dtor(&member);                                                        \
+  }                                                                            \
+  PHP_METHOD(UPPER_CLASS, set##UPPER_FIELD) {                                  \
+    zval* value = NULL;                                                        \
+    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &value) ==       \
+        FAILURE) {                                                             \
+      return;                                                                  \
+    }                                                                          \
+    zval member;                                                               \
+    PHP_PROTO_ZVAL_STRING(&member, LOWER_FIELD, 1);                            \
+    message_set_property_internal(getThis(), &member, value TSRMLS_CC);        \
+    zval_dtor(&member);                                                        \
+    PHP_PROTO_RETVAL_ZVAL(getThis());                                          \
+  }
+
+#define PHP_PROTO_ONEOF_ACCESSORS(UPPER_CLASS, LOWER_CLASS, UPPER_FIELD, \
+                                  LOWER_FIELD)                           \
+  PHP_METHOD(UPPER_CLASS, get##UPPER_FIELD) {                            \
+    MessageHeader* msg = UNBOX(MessageHeader, getThis());                \
+    PHP_PROTO_FAKE_SCOPE_BEGIN(LOWER_CLASS##_type);                      \
+    const upb_oneofdef* oneof = upb_msgdef_ntoo(                         \
+        msg->descriptor->msgdef, LOWER_FIELD, strlen(LOWER_FIELD));      \
+    const char* oneof_case_name = layout_get_oneof_case(                 \
+        msg->descriptor->layout, message_data(msg), oneof TSRMLS_CC);    \
+    PHP_PROTO_FAKE_SCOPE_END;                                            \
+    PHP_PROTO_RETURN_STRING(oneof_case_name, 1);                         \
+  }
+
+// Forward declare file init functions
+static void init_file_any(TSRMLS_D);
+static void init_file_api(TSRMLS_D);
+static void init_file_duration(TSRMLS_D);
+static void init_file_field_mask(TSRMLS_D);
+static void init_file_empty(TSRMLS_D);
+static void init_file_source_context(TSRMLS_D);
+static void init_file_struct(TSRMLS_D);
+static void init_file_timestamp(TSRMLS_D);
+static void init_file_type(TSRMLS_D);
+static void init_file_wrappers(TSRMLS_D);
+
+// Define file init functions
+static void init_file_any(TSRMLS_D) {
+  if (is_inited_file_any) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0acd010a19676f6f676c652f70726f746f6275662f616e792e70726f746f"
+      "120f676f6f676c652e70726f746f62756622260a03416e7912100a087479"
+      "70655f75726c180120012809120d0a0576616c756518022001280c426f0a"
+      "13636f6d2e676f6f676c652e70726f746f6275664208416e7950726f746f"
+      "50015a256769746875622e636f6d2f676f6c616e672f70726f746f627566"
+      "2f7074797065732f616e79a20203475042aa021e476f6f676c652e50726f"
+      "746f6275662e57656c6c4b6e6f776e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_any = true;
+}
+
+static void init_file_api(TSRMLS_D) {
+  if (is_inited_file_api) return;
+  init_file_source_context(TSRMLS_C);
+  init_file_type(TSRMLS_C);
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0aee050a19676f6f676c652f70726f746f6275662f6170692e70726f746f"
+      "120f676f6f676c652e70726f746f6275661a24676f6f676c652f70726f74"
+      "6f6275662f736f757263655f636f6e746578742e70726f746f1a1a676f6f"
+      "676c652f70726f746f6275662f747970652e70726f746f2281020a034170"
+      "69120c0a046e616d6518012001280912280a076d6574686f647318022003"
+      "280b32172e676f6f676c652e70726f746f6275662e4d6574686f6412280a"
+      "076f7074696f6e7318032003280b32172e676f6f676c652e70726f746f62"
+      "75662e4f7074696f6e120f0a0776657273696f6e18042001280912360a0e"
+      "736f757263655f636f6e7465787418052001280b321e2e676f6f676c652e"
+      "70726f746f6275662e536f75726365436f6e7465787412260a066d697869"
+      "6e7318062003280b32162e676f6f676c652e70726f746f6275662e4d6978"
+      "696e12270a0673796e74617818072001280e32172e676f6f676c652e7072"
+      "6f746f6275662e53796e74617822d5010a064d6574686f64120c0a046e61"
+      "6d6518012001280912180a10726571756573745f747970655f75726c1802"
+      "2001280912190a11726571756573745f73747265616d696e671803200128"
+      "0812190a11726573706f6e73655f747970655f75726c180420012809121a"
+      "0a12726573706f6e73655f73747265616d696e6718052001280812280a07"
+      "6f7074696f6e7318062003280b32172e676f6f676c652e70726f746f6275"
+      "662e4f7074696f6e12270a0673796e74617818072001280e32172e676f6f"
+      "676c652e70726f746f6275662e53796e74617822230a054d6978696e120c"
+      "0a046e616d65180120012809120c0a04726f6f7418022001280942750a13"
+      "636f6d2e676f6f676c652e70726f746f627566420841706950726f746f50"
+      "015a2b676f6f676c652e676f6c616e672e6f72672f67656e70726f746f2f"
+      "70726f746f6275662f6170693b617069a20203475042aa021e476f6f676c"
+      "652e50726f746f6275662e57656c6c4b6e6f776e5479706573620670726f"
+      "746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_api = true;
+}
+
+static void init_file_duration(TSRMLS_D) {
+  if (is_inited_file_duration) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0ae3010a1e676f6f676c652f70726f746f6275662f6475726174696f6e2e"
+      "70726f746f120f676f6f676c652e70726f746f627566222a0a0844757261"
+      "74696f6e120f0a077365636f6e6473180120012803120d0a056e616e6f73"
+      "180220012805427c0a13636f6d2e676f6f676c652e70726f746f62756642"
+      "0d4475726174696f6e50726f746f50015a2a6769746875622e636f6d2f67"
+      "6f6c616e672f70726f746f6275662f7074797065732f6475726174696f6e"
+      "f80101a20203475042aa021e476f6f676c652e50726f746f6275662e5765"
+      "6c6c4b6e6f776e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_duration = true;
+}
+
+static void init_file_field_mask(TSRMLS_D) {
+  if (is_inited_file_field_mask) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0ae3010a20676f6f676c652f70726f746f6275662f6669656c645f6d6173"
+      "6b2e70726f746f120f676f6f676c652e70726f746f627566221a0a094669"
+      "656c644d61736b120d0a0570617468731801200328094289010a13636f6d"
+      "2e676f6f676c652e70726f746f627566420e4669656c644d61736b50726f"
+      "746f50015a39676f6f676c652e676f6c616e672e6f72672f67656e70726f"
+      "746f2f70726f746f6275662f6669656c645f6d61736b3b6669656c645f6d"
+      "61736ba20203475042aa021e476f6f676c652e50726f746f6275662e5765"
+      "6c6c4b6e6f776e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_field_mask = true;
+}
+
+static void init_file_empty(TSRMLS_D) {
+  if (is_inited_file_empty) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0ab7010a1b676f6f676c652f70726f746f6275662f656d7074792e70726f"
+      "746f120f676f6f676c652e70726f746f62756622070a05456d7074794276"
+      "0a13636f6d2e676f6f676c652e70726f746f627566420a456d7074795072"
+      "6f746f50015a276769746875622e636f6d2f676f6c616e672f70726f746f"
+      "6275662f7074797065732f656d707479f80101a20203475042aa021e476f"
+      "6f676c652e50726f746f6275662e57656c6c4b6e6f776e54797065736206"
+      "70726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_empty = true;
+}
+
+static void init_file_source_context(TSRMLS_D) {
+  if (is_inited_file_source_context) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0afb010a24676f6f676c652f70726f746f6275662f736f757263655f636f"
+      "6e746578742e70726f746f120f676f6f676c652e70726f746f6275662222"
+      "0a0d536f75726365436f6e7465787412110a0966696c655f6e616d651801"
+      "200128094295010a13636f6d2e676f6f676c652e70726f746f6275664212"
+      "536f75726365436f6e7465787450726f746f50015a41676f6f676c652e67"
+      "6f6c616e672e6f72672f67656e70726f746f2f70726f746f6275662f736f"
+      "757263655f636f6e746578743b736f757263655f636f6e74657874a20203"
+      "475042aa021e476f6f676c652e50726f746f6275662e57656c6c4b6e6f77"
+      "6e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_source_context = true;
+}
+
+static void init_file_struct(TSRMLS_D) {
+  if (is_inited_file_struct) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0a81050a1c676f6f676c652f70726f746f6275662f7374727563742e7072"
+      "6f746f120f676f6f676c652e70726f746f6275662284010a065374727563"
+      "7412330a066669656c647318012003280b32232e676f6f676c652e70726f"
+      "746f6275662e5374727563742e4669656c6473456e7472791a450a0b4669"
+      "656c6473456e747279120b0a036b657918012001280912250a0576616c75"
+      "6518022001280b32162e676f6f676c652e70726f746f6275662e56616c75"
+      "653a02380122ea010a0556616c756512300a0a6e756c6c5f76616c756518"
+      "012001280e321a2e676f6f676c652e70726f746f6275662e4e756c6c5661"
+      "6c7565480012160a0c6e756d6265725f76616c7565180220012801480012"
+      "160a0c737472696e675f76616c7565180320012809480012140a0a626f6f"
+      "6c5f76616c75651804200128084800122f0a0c7374727563745f76616c75"
+      "6518052001280b32172e676f6f676c652e70726f746f6275662e53747275"
+      "6374480012300a0a6c6973745f76616c756518062001280b321a2e676f6f"
+      "676c652e70726f746f6275662e4c69737456616c7565480042060a046b69"
+      "6e6422330a094c69737456616c756512260a0676616c7565731801200328"
+      "0b32162e676f6f676c652e70726f746f6275662e56616c75652a1b0a094e"
+      "756c6c56616c7565120e0a0a4e554c4c5f56414c554510004281010a1363"
+      "6f6d2e676f6f676c652e70726f746f627566420b53747275637450726f74"
+      "6f50015a316769746875622e636f6d2f676f6c616e672f70726f746f6275"
+      "662f7074797065732f7374727563743b7374727563747062f80101a20203"
+      "475042aa021e476f6f676c652e50726f746f6275662e57656c6c4b6e6f77"
+      "6e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_struct = true;
+}
+
+static void init_file_timestamp(TSRMLS_D) {
+  if (is_inited_file_timestamp) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0ae7010a1f676f6f676c652f70726f746f6275662f74696d657374616d70"
+      "2e70726f746f120f676f6f676c652e70726f746f627566222b0a0954696d"
+      "657374616d70120f0a077365636f6e6473180120012803120d0a056e616e"
+      "6f73180220012805427e0a13636f6d2e676f6f676c652e70726f746f6275"
+      "66420e54696d657374616d7050726f746f50015a2b6769746875622e636f"
+      "6d2f676f6c616e672f70726f746f6275662f7074797065732f74696d6573"
+      "74616d70f80101a20203475042aa021e476f6f676c652e50726f746f6275"
+      "662e57656c6c4b6e6f776e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_timestamp = true;
+}
+
+static void init_file_type(TSRMLS_D) {
+  if (is_inited_file_type) return;
+  init_file_any(TSRMLS_C);
+  init_file_source_context(TSRMLS_C);
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0aba0c0a1a676f6f676c652f70726f746f6275662f747970652e70726f74"
+      "6f120f676f6f676c652e70726f746f6275661a19676f6f676c652f70726f"
+      "746f6275662f616e792e70726f746f1a24676f6f676c652f70726f746f62"
+      "75662f736f757263655f636f6e746578742e70726f746f22d7010a045479"
+      "7065120c0a046e616d6518012001280912260a066669656c647318022003"
+      "280b32162e676f6f676c652e70726f746f6275662e4669656c64120e0a06"
+      "6f6e656f667318032003280912280a076f7074696f6e7318042003280b32"
+      "172e676f6f676c652e70726f746f6275662e4f7074696f6e12360a0e736f"
+      "757263655f636f6e7465787418052001280b321e2e676f6f676c652e7072"
+      "6f746f6275662e536f75726365436f6e7465787412270a0673796e746178"
+      "18062001280e32172e676f6f676c652e70726f746f6275662e53796e7461"
+      "7822d5050a054669656c6412290a046b696e6418012001280e321b2e676f"
+      "6f676c652e70726f746f6275662e4669656c642e4b696e6412370a0b6361"
+      "7264696e616c69747918022001280e32222e676f6f676c652e70726f746f"
+      "6275662e4669656c642e43617264696e616c697479120e0a066e756d6265"
+      "72180320012805120c0a046e616d6518042001280912100a08747970655f"
+      "75726c18062001280912130a0b6f6e656f665f696e646578180720012805"
+      "120e0a067061636b656418082001280812280a076f7074696f6e73180920"
+      "03280b32172e676f6f676c652e70726f746f6275662e4f7074696f6e1211"
+      "0a096a736f6e5f6e616d65180a2001280912150a0d64656661756c745f76"
+      "616c7565180b2001280922c8020a044b696e6412100a0c545950455f554e"
+      "4b4e4f574e1000120f0a0b545950455f444f55424c451001120e0a0a5459"
+      "50455f464c4f41541002120e0a0a545950455f494e5436341003120f0a0b"
+      "545950455f55494e5436341004120e0a0a545950455f494e543332100512"
+      "100a0c545950455f46495845443634100612100a0c545950455f46495845"
+      "4433321007120d0a09545950455f424f4f4c1008120f0a0b545950455f53"
+      "5452494e471009120e0a0a545950455f47524f5550100a12100a0c545950"
+      "455f4d455353414745100b120e0a0a545950455f4259544553100c120f0a"
+      "0b545950455f55494e543332100d120d0a09545950455f454e554d100e12"
+      "110a0d545950455f5346495845443332100f12110a0d545950455f534649"
+      "58454436341010120f0a0b545950455f53494e5433321011120f0a0b5459"
+      "50455f53494e543634101222740a0b43617264696e616c69747912170a13"
+      "43415244494e414c4954595f554e4b4e4f574e100012180a144341524449"
+      "4e414c4954595f4f5054494f4e414c100112180a1443415244494e414c49"
+      "54595f5245515549524544100212180a1443415244494e414c4954595f52"
+      "45504541544544100322ce010a04456e756d120c0a046e616d6518012001"
+      "2809122d0a09656e756d76616c756518022003280b321a2e676f6f676c65"
+      "2e70726f746f6275662e456e756d56616c756512280a076f7074696f6e73"
+      "18032003280b32172e676f6f676c652e70726f746f6275662e4f7074696f"
+      "6e12360a0e736f757263655f636f6e7465787418042001280b321e2e676f"
+      "6f676c652e70726f746f6275662e536f75726365436f6e7465787412270a"
+      "0673796e74617818052001280e32172e676f6f676c652e70726f746f6275"
+      "662e53796e74617822530a09456e756d56616c7565120c0a046e616d6518"
+      "0120012809120e0a066e756d62657218022001280512280a076f7074696f"
+      "6e7318032003280b32172e676f6f676c652e70726f746f6275662e4f7074"
+      "696f6e223b0a064f7074696f6e120c0a046e616d6518012001280912230a"
+      "0576616c756518022001280b32142e676f6f676c652e70726f746f627566"
+      "2e416e792a2e0a0653796e74617812110a0d53594e5441585f50524f544f"
+      "32100012110a0d53594e5441585f50524f544f331001427d0a13636f6d2e"
+      "676f6f676c652e70726f746f62756642095479706550726f746f50015a2f"
+      "676f6f676c652e676f6c616e672e6f72672f67656e70726f746f2f70726f"
+      "746f6275662f70747970653b7074797065f80101a20203475042aa021e47"
+      "6f6f676c652e50726f746f6275662e57656c6c4b6e6f776e547970657362"
+      "0670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_type = true;
+}
+
+static void init_file_wrappers(TSRMLS_D) {
+  if (is_inited_file_wrappers) return;
+  init_generated_pool_once(TSRMLS_C);
+  const char* generated_file =
+      "0abf030a1e676f6f676c652f70726f746f6275662f77726170706572732e"
+      "70726f746f120f676f6f676c652e70726f746f627566221c0a0b446f7562"
+      "6c6556616c7565120d0a0576616c7565180120012801221b0a0a466c6f61"
+      "7456616c7565120d0a0576616c7565180120012802221b0a0a496e743634"
+      "56616c7565120d0a0576616c7565180120012803221c0a0b55496e743634"
+      "56616c7565120d0a0576616c7565180120012804221b0a0a496e74333256"
+      "616c7565120d0a0576616c7565180120012805221c0a0b55496e74333256"
+      "616c7565120d0a0576616c756518012001280d221a0a09426f6f6c56616c"
+      "7565120d0a0576616c7565180120012808221c0a0b537472696e6756616c"
+      "7565120d0a0576616c7565180120012809221b0a0a427974657356616c75"
+      "65120d0a0576616c756518012001280c427c0a13636f6d2e676f6f676c65"
+      "2e70726f746f627566420d577261707065727350726f746f50015a2a6769"
+      "746875622e636f6d2f676f6c616e672f70726f746f6275662f7074797065"
+      "732f7772617070657273f80101a20203475042aa021e476f6f676c652e50"
+      "726f746f6275662e57656c6c4b6e6f776e5479706573620670726f746f33";
+  char* binary;
+  int binary_len;
+  hex_to_binary(generated_file, &binary, &binary_len);
+  internal_add_generated_file(binary, binary_len, generated_pool TSRMLS_CC);
+  FREE(binary);
+  is_inited_file_wrappers = true;
+}
+
+// -----------------------------------------------------------------------------
+// Define enum
+// -----------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------
+// Field_Cardinality
+// -----------------------------------------------------------------------------
+
+static zend_function_entry field_cardinality_methods[] = {
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* field_cardinality_type;
+
+// Init class entry.
+PHP_PROTO_INIT_ENUMCLASS_START("Google\\Protobuf\\Field\\Cardinality",
+                                Field_Cardinality, field_cardinality)
+  zend_declare_class_constant_long(field_cardinality_type,
+                                   "CARDINALITY_UNKNOWN", 19, 0 TSRMLS_CC);
+  zend_declare_class_constant_long(field_cardinality_type,
+                                   "CARDINALITY_OPTIONAL", 20, 1 TSRMLS_CC);
+  zend_declare_class_constant_long(field_cardinality_type,
+                                   "CARDINALITY_REQUIRED", 20, 2 TSRMLS_CC);
+  zend_declare_class_constant_long(field_cardinality_type,
+                                   "CARDINALITY_REPEATED", 20, 3 TSRMLS_CC);
+  const char *alias = "Google\\Protobuf\\Field_Cardinality";
+  zend_register_class_alias_ex(alias, strlen(alias), field_cardinality_type TSRMLS_CC);
+PHP_PROTO_INIT_ENUMCLASS_END
+
+// -----------------------------------------------------------------------------
+// Field_Kind
+// -----------------------------------------------------------------------------
+
+static zend_function_entry field_kind_methods[] = {
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* field_kind_type;
+
+// Init class entry.
+PHP_PROTO_INIT_ENUMCLASS_START("Google\\Protobuf\\Field\\Kind",
+                                Field_Kind, field_kind)
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_UNKNOWN", 12, 0 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_DOUBLE", 11, 1 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_FLOAT", 10, 2 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_INT64", 10, 3 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_UINT64", 11, 4 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_INT32", 10, 5 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_FIXED64", 12, 6 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_FIXED32", 12, 7 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_BOOL", 9, 8 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_STRING", 11, 9 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_GROUP", 10, 10 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_MESSAGE", 12, 11 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_BYTES", 10, 12 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_UINT32", 11, 13 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_ENUM", 9, 14 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_SFIXED32", 13, 15 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_SFIXED64", 13, 16 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_SINT32", 11, 17 TSRMLS_CC);
+  zend_declare_class_constant_long(field_kind_type,
+                                   "TYPE_SINT64", 11, 18 TSRMLS_CC);
+  const char *alias = "Google\\Protobuf\\Field_Kind";
+  zend_register_class_alias_ex(alias, strlen(alias), field_kind_type TSRMLS_CC);
+PHP_PROTO_INIT_ENUMCLASS_END
+
+// -----------------------------------------------------------------------------
+// NullValue
+// -----------------------------------------------------------------------------
+
+static zend_function_entry null_value_methods[] = {
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* null_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_ENUMCLASS_START("Google\\Protobuf\\NullValue",
+                                NullValue, null_value)
+  zend_declare_class_constant_long(null_value_type,
+                                   "NULL_VALUE", 10, 0 TSRMLS_CC);
+PHP_PROTO_INIT_ENUMCLASS_END
+
+// -----------------------------------------------------------------------------
+// Syntax
+// -----------------------------------------------------------------------------
+
+static zend_function_entry syntax_methods[] = {
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* syntax_type;
+
+// Init class entry.
+PHP_PROTO_INIT_ENUMCLASS_START("Google\\Protobuf\\Syntax",
+                                Syntax, syntax)
+  zend_declare_class_constant_long(syntax_type,
+                                   "SYNTAX_PROTO2", 13, 0 TSRMLS_CC);
+  zend_declare_class_constant_long(syntax_type,
+                                   "SYNTAX_PROTO3", 13, 1 TSRMLS_CC);
+PHP_PROTO_INIT_ENUMCLASS_END
+
+
+
+// -----------------------------------------------------------------------------
+// Define message
+// -----------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------
+// Any
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry any_methods[] = {
+  PHP_ME(Any, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, getTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, setTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, setValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, pack,     NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, unpack,   NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Any, is,       NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* any_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Any", Any, any)
+  zend_class_implements(any_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_string(any_type, "type_url", strlen("type_url"),
+                               "" ,ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_string(any_type, "value", strlen("value"),
+                               "" ,ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+static void hex_to_binary(const char* hex, char** binary, int* binary_len) {
+  int i;
+  int hex_len = strlen(hex);
+  *binary_len = hex_len / 2;
+  *binary = ALLOC_N(char, *binary_len);
+  for (i = 0; i < *binary_len; i++) {
+    char value = 0;
+    if (hex[i * 2] >= '0' && hex[i * 2] <= '9') {
+      value += (hex[i * 2] - '0') * 16;
+    } else {
+      value += (hex[i * 2] - 'a' + 10) * 16;
+    }
+    if (hex[i * 2 + 1] >= '0' && hex[i * 2 + 1] <= '9') {
+      value += hex[i * 2 + 1] - '0';
+    } else {
+      value += hex[i * 2 + 1] - 'a' + 10;
+    }
+    (*binary)[i] = value;
+  }
+}
+
+PHP_METHOD(Any, __construct) {
+  init_file_any(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(any_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Any, any, TypeUrl, "type_url")
+PHP_PROTO_FIELD_ACCESSORS(Any, any, Value,   "value")
+
+PHP_METHOD(Any, unpack) {
+  // Get type url.
+  zval type_url_member;
+  PHP_PROTO_ZVAL_STRING(&type_url_member, "type_url", 1);
+  PHP_PROTO_FAKE_SCOPE_BEGIN(any_type);
+  zval* type_url_php = php_proto_message_read_property(
+      getThis(), &type_url_member PHP_PROTO_TSRMLS_CC);
+  zval_dtor(&type_url_member);
+  PHP_PROTO_FAKE_SCOPE_END;
+
+  // Get fully-qualified name from type url.
+  size_t url_prefix_len = strlen(TYPE_URL_PREFIX);
+  const char* type_url = Z_STRVAL_P(type_url_php);
+  size_t type_url_len = Z_STRLEN_P(type_url_php);
+
+  if (url_prefix_len > type_url_len ||
+      strncmp(TYPE_URL_PREFIX, type_url, url_prefix_len) != 0) {
+    zend_throw_exception(
+        NULL, "Type url needs to be type.googleapis.com/fully-qualified",
+        0 TSRMLS_CC);
+    return;
+  }
+
+  const char* fully_qualified_name = type_url + url_prefix_len;
+  PHP_PROTO_HASHTABLE_VALUE desc_php = get_proto_obj(fully_qualified_name);
+  if (desc_php == NULL) {
+    zend_throw_exception(
+        NULL, "Specified message in any hasn't been added to descriptor pool",
+        0 TSRMLS_CC);
+    return;
+  }
+  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, desc_php);
+  zend_class_entry* klass = desc->klass;
+  ZVAL_OBJ(return_value, klass->create_object(klass TSRMLS_CC));
+  MessageHeader* msg = UNBOX(MessageHeader, return_value);
+  custom_data_init(klass, msg PHP_PROTO_TSRMLS_CC);
+
+  // Get value.
+  zval value_member;
+  PHP_PROTO_ZVAL_STRING(&value_member, "value", 1);
+  PHP_PROTO_FAKE_SCOPE_RESTART(any_type);
+  zval* value = php_proto_message_read_property(
+      getThis(), &value_member PHP_PROTO_TSRMLS_CC);
+  zval_dtor(&value_member);
+  PHP_PROTO_FAKE_SCOPE_END;
+
+  merge_from_string(Z_STRVAL_P(value), Z_STRLEN_P(value), desc, msg);
 }
+
+PHP_METHOD(Any, pack) {
+  zval* val;
+
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "o", &val) ==
+      FAILURE) {
+    return;
+  }
+
+  if (!instanceof_function(Z_OBJCE_P(val), message_type TSRMLS_CC)) {
+    zend_error(E_USER_ERROR, "Given value is not an instance of Message.");
+    return;
+  }
+
+  // Set value by serialized data.
+  zval data;
+  serialize_to_string(val, &data TSRMLS_CC);
+
+  zval member;
+  PHP_PROTO_ZVAL_STRING(&member, "value", 1);
+
+  PHP_PROTO_FAKE_SCOPE_BEGIN(any_type);
+  message_handlers->write_property(getThis(), &member, &data,
+                                   NULL PHP_PROTO_TSRMLS_CC);
+  zval_dtor(&data);
+  zval_dtor(&member);
+  PHP_PROTO_FAKE_SCOPE_END;
+
+  // Set type url.
+  Descriptor* desc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(Z_OBJCE_P(val)));
+  const char* fully_qualified_name = upb_msgdef_fullname(desc->msgdef);
+  size_t type_url_len =
+      strlen(TYPE_URL_PREFIX) + strlen(fully_qualified_name) + 1;
+  char* type_url = ALLOC_N(char, type_url_len);
+  sprintf(type_url, "%s%s", TYPE_URL_PREFIX, fully_qualified_name);
+  zval type_url_php;
+  PHP_PROTO_ZVAL_STRING(&type_url_php, type_url, 1);
+  PHP_PROTO_ZVAL_STRING(&member, "type_url", 1);
+
+  PHP_PROTO_FAKE_SCOPE_RESTART(any_type);
+  message_handlers->write_property(getThis(), &member, &type_url_php,
+                                   NULL PHP_PROTO_TSRMLS_CC);
+  zval_dtor(&type_url_php);
+  zval_dtor(&member);
+  PHP_PROTO_FAKE_SCOPE_END;
+  FREE(type_url);
+}
+
+PHP_METHOD(Any, is) {
+  zend_class_entry *klass = NULL;
+
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "C", &klass) ==
+      FAILURE) {
+    return;
+  }
+
+  PHP_PROTO_HASHTABLE_VALUE desc_php = get_ce_obj(klass);
+  if (desc_php == NULL) {
+    RETURN_BOOL(false);
+  }
+
+  // Create corresponded type url.
+  Descriptor* desc =
+      UNBOX_HASHTABLE_VALUE(Descriptor, get_ce_obj(klass));
+  const char* fully_qualified_name = upb_msgdef_fullname(desc->msgdef);
+  size_t type_url_len =
+      strlen(TYPE_URL_PREFIX) + strlen(fully_qualified_name) + 1;
+  char* type_url = ALLOC_N(char, type_url_len);
+  sprintf(type_url, "%s%s", TYPE_URL_PREFIX, fully_qualified_name);
+
+  // Fetch stored type url.
+  zval member;
+  PHP_PROTO_ZVAL_STRING(&member, "type_url", 1);
+  PHP_PROTO_FAKE_SCOPE_BEGIN(any_type);
+  zval* value =
+      php_proto_message_read_property(getThis(), &member PHP_PROTO_TSRMLS_CC);
+  zval_dtor(&member);
+  PHP_PROTO_FAKE_SCOPE_END;
+
+  // Compare two type url.
+  bool is = strcmp(type_url, Z_STRVAL_P(value)) == 0;
+  FREE(type_url);
+
+  RETURN_BOOL(is);
+}
+
+// -----------------------------------------------------------------------------
+// Duration
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry duration_methods[] = {
+  PHP_ME(Duration, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Duration, getSeconds, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Duration, setSeconds, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Duration, getNanos, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Duration, setNanos, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* duration_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Duration",
+                                 Duration, duration)
+  zend_class_implements(duration_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_long(duration_type, "seconds", strlen("seconds"),
+                             0 ,ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_long(duration_type, "nanos", strlen("nanos"),
+                             0 ,ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Duration, __construct) {
+  init_file_duration(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(duration_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Duration, duration, Seconds, "seconds")
+PHP_PROTO_FIELD_ACCESSORS(Duration, duration, Nanos,   "nanos")
+
+// -----------------------------------------------------------------------------
+// Timestamp
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry timestamp_methods[] = {
+  PHP_ME(Timestamp, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, fromDateTime, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, toDateTime, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, getSeconds, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, setSeconds, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, getNanos, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Timestamp, setNanos, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* timestamp_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Timestamp",
+                                 Timestamp, timestamp)
+  zend_class_implements(timestamp_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_long(timestamp_type, "seconds", strlen("seconds"),
+                             0 ,ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_long(timestamp_type, "nanos", strlen("nanos"),
+                             0 ,ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Timestamp, __construct) {
+  init_file_timestamp(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(timestamp_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Timestamp, timestamp, Seconds, "seconds")
+PHP_PROTO_FIELD_ACCESSORS(Timestamp, timestamp, Nanos,   "nanos")
+
+PHP_METHOD(Timestamp, fromDateTime) {
+  zval* datetime;
+  zval member;
+
+  PHP_PROTO_CE_DECLARE date_interface_ce;
+  if (php_proto_zend_lookup_class("\\DatetimeInterface", 18,
+                                  &date_interface_ce) == FAILURE) {
+    zend_error(E_ERROR, "Make sure date extension is enabled.");
+    return;
+  }
+
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "O", &datetime,
+                            PHP_PROTO_CE_UNREF(date_interface_ce)) == FAILURE) {
+    zend_error(E_USER_ERROR, "Expect DatetimeInterface.");
+    return;
+  }
+
+  // Get timestamp from Datetime object.
+  zval retval;
+  zval function_name;
+  int64_t timestamp;
+
+#if PHP_MAJOR_VERSION < 7
+  INIT_ZVAL(retval);
+  INIT_ZVAL(function_name);
+#endif
+
+  PHP_PROTO_ZVAL_STRING(&function_name, "date_timestamp_get", 1);
+
+  if (call_user_function(EG(function_table), NULL, &function_name, &retval, 1,
+          ZVAL_PTR_TO_CACHED_PTR(datetime) TSRMLS_CC) == FAILURE) {
+    zend_error(E_ERROR, "Cannot get timestamp from DateTime.");
+    return;
+  }
+
+  protobuf_convert_to_int64(&retval, &timestamp);
+
+  zval_dtor(&retval);
+  zval_dtor(&function_name);
+
+  // Set seconds
+  MessageHeader* self = UNBOX(MessageHeader, getThis());
+  const upb_fielddef* field =
+      upb_msgdef_ntofz(self->descriptor->msgdef, "seconds");
+  void* storage = message_data(self);
+  void* memory = slot_memory(self->descriptor->layout, storage, field);
+  *(int64_t*)memory = timestamp;
+
+  // Set nanos
+  field = upb_msgdef_ntofz(self->descriptor->msgdef, "nanos");
+  storage = message_data(self);
+  memory = slot_memory(self->descriptor->layout, storage, field);
+  *(int32_t*)memory = 0;
+
+  RETURN_NULL();
+}
+
+PHP_METHOD(Timestamp, toDateTime) {
+  // Get seconds
+  MessageHeader* self = UNBOX(MessageHeader, getThis());
+  const upb_fielddef* field =
+      upb_msgdef_ntofz(self->descriptor->msgdef, "seconds");
+  void* storage = message_data(self);
+  void* memory = slot_memory(self->descriptor->layout, storage, field);
+  int64_t seconds = *(int64_t*)memory;
+
+  // Get nanos
+  field = upb_msgdef_ntofz(self->descriptor->msgdef, "nanos");
+  memory = slot_memory(self->descriptor->layout, storage, field);
+  int32_t nanos = *(int32_t*)memory;
+
+  // Get formated time string.
+  char formated_time[50];
+  time_t raw_time = seconds;
+  struct tm *utc_time = gmtime(&raw_time);
+  strftime(formated_time, sizeof(formated_time), "%Y-%m-%dT%H:%M:%SUTC",
+           utc_time);
+
+  // Create Datetime object.
+  zval datetime;
+  zval formated_time_php;
+  zval function_name;
+  int64_t timestamp = 0;
+
+#if PHP_MAJOR_VERSION < 7
+  INIT_ZVAL(function_name);
+  INIT_ZVAL(formated_time_php);
+#endif
+
+  PHP_PROTO_ZVAL_STRING(&function_name, "date_create", 1);
+  PHP_PROTO_ZVAL_STRING(&formated_time_php, formated_time, 1);
+
+  CACHED_VALUE params[1] = {ZVAL_TO_CACHED_VALUE(formated_time_php)};
+
+  if (call_user_function(EG(function_table), NULL,
+                         &function_name, &datetime, 1,
+                         params TSRMLS_CC) == FAILURE) {
+    zend_error(E_ERROR, "Cannot create DateTime.");
+    return;
+  }
+
+  zval_dtor(&formated_time_php);
+  zval_dtor(&function_name);
+
+#if PHP_MAJOR_VERSION < 7
+  zval* datetime_ptr = &datetime;
+  PHP_PROTO_RETVAL_ZVAL(datetime_ptr);
+#else
+  ZVAL_OBJ(return_value, Z_OBJ(datetime));
+#endif
+}
+
+// -----------------------------------------------------------------------------
+// Api
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry api_methods[] = {
+  PHP_ME(Api, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getMethods, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setMethods, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getVersion, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setVersion, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getMixins, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setMixins, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, getSyntax, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Api, setSyntax, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* api_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Api",
+                                 Api, api)
+  zend_class_implements(api_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(api_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "methods", strlen("methods"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "version", strlen("version"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "source_context", strlen("source_context"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "mixins", strlen("mixins"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(api_type, "syntax", strlen("syntax"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Api, __construct) {
+  init_file_api(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(api_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Methods, "methods")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Options, "options")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Version, "version")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, SourceContext, "source_context")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Mixins, "mixins")
+PHP_PROTO_FIELD_ACCESSORS(Api, api, Syntax, "syntax")
+
+// -----------------------------------------------------------------------------
+// BoolValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry bool_value_methods[] = {
+  PHP_ME(BoolValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(BoolValue, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(BoolValue, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* bool_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\BoolValue",
+                                 BoolValue, bool_value)
+  zend_class_implements(bool_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(bool_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(BoolValue, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(bool_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(BoolValue, bool_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// BytesValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry bytes_value_methods[] = {
+  PHP_ME(BytesValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(BytesValue, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(BytesValue, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* bytes_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\BytesValue",
+                                 BytesValue, bytes_value)
+  zend_class_implements(bytes_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(bytes_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(BytesValue, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(bytes_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(BytesValue, bytes_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// DoubleValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry double_value_methods[] = {
+  PHP_ME(DoubleValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(DoubleValue, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(DoubleValue, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* double_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\DoubleValue",
+                                 DoubleValue, double_value)
+  zend_class_implements(double_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(double_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(DoubleValue, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(double_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(DoubleValue, double_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// Enum
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry enum_methods[] = {
+  PHP_ME(Enum, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, getEnumvalue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, setEnumvalue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, setOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, getSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, setSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, getSyntax, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Enum, setSyntax, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* enum_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Enum",
+                                 Enum, enum)
+  zend_class_implements(enum_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(enum_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_type, "enumvalue", strlen("enumvalue"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_type, "source_context", strlen("source_context"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_type, "syntax", strlen("syntax"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Enum, __construct) {
+  init_file_type(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(enum_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Enum, enum, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Enum, enum, Enumvalue, "enumvalue")
+PHP_PROTO_FIELD_ACCESSORS(Enum, enum, Options, "options")
+PHP_PROTO_FIELD_ACCESSORS(Enum, enum, SourceContext, "source_context")
+PHP_PROTO_FIELD_ACCESSORS(Enum, enum, Syntax, "syntax")
+
+// -----------------------------------------------------------------------------
+// EnumValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry enum_value_methods[] = {
+  PHP_ME(EnumValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, getNumber, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, setNumber, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(EnumValue, setOptions, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* enum_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\EnumValue",
+                                 EnumValue, enum_value)
+  zend_class_implements(enum_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(enum_value_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_value_type, "number", strlen("number"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(enum_value_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(EnumValue, __construct) {
+  init_file_type(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(enum_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(EnumValue, enum_value, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(EnumValue, enum_value, Number, "number")
+PHP_PROTO_FIELD_ACCESSORS(EnumValue, enum_value, Options, "options")
+
+// -----------------------------------------------------------------------------
+// FieldMask
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry field_mask_methods[] = {
+  PHP_ME(FieldMask, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldMask, getPaths, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FieldMask, setPaths, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* field_mask_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\FieldMask",
+                                 FieldMask, field_mask)
+  zend_class_implements(field_mask_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(field_mask_type, "paths", strlen("paths"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(FieldMask, __construct) {
+  init_file_field_mask(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(field_mask_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(FieldMask, field_mask, Paths, "paths")
+
+// -----------------------------------------------------------------------------
+// Field
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry field_methods[] = {
+  PHP_ME(Field, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getKind, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setKind, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getCardinality, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setCardinality, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getNumber, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setNumber, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getOneofIndex, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setOneofIndex, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getPacked, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setPacked, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getJsonName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setJsonName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, getDefaultValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Field, setDefaultValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* field_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Field",
+                                 Field, field)
+  zend_class_implements(field_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(field_type, "kind", strlen("kind"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "cardinality", strlen("cardinality"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "number", strlen("number"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "type_url", strlen("type_url"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "oneof_index", strlen("oneof_index"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "packed", strlen("packed"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "json_name", strlen("json_name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(field_type, "default_value", strlen("default_value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Field, __construct) {
+  init_file_type(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(field_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Kind, "kind")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Cardinality, "cardinality")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Number, "number")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, TypeUrl, "type_url")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, OneofIndex, "oneof_index")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Packed, "packed")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, Options, "options")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, JsonName, "json_name")
+PHP_PROTO_FIELD_ACCESSORS(Field, field, DefaultValue, "default_value")
+
+// -----------------------------------------------------------------------------
+// FloatValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry float_value_methods[] = {
+  PHP_ME(FloatValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FloatValue, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(FloatValue, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* float_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\FloatValue",
+                                 FloatValue, float_value)
+  zend_class_implements(float_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(float_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(FloatValue, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(float_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(FloatValue, float_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// GPBEmpty
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry empty_methods[] = {
+  PHP_ME(GPBEmpty, __construct, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* empty_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\GPBEmpty",
+                                 GPBEmpty, empty)
+  zend_class_implements(empty_type TSRMLS_CC, 1, message_type);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(GPBEmpty, __construct) {
+  init_file_empty(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(empty_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+
+// -----------------------------------------------------------------------------
+// Int32Value
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry int32_value_methods[] = {
+  PHP_ME(Int32Value, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Int32Value, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Int32Value, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* int32_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Int32Value",
+                                 Int32Value, int32_value)
+  zend_class_implements(int32_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(int32_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Int32Value, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(int32_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Int32Value, int32_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// Int64Value
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry int64_value_methods[] = {
+  PHP_ME(Int64Value, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Int64Value, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Int64Value, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* int64_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Int64Value",
+                                 Int64Value, int64_value)
+  zend_class_implements(int64_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(int64_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Int64Value, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(int64_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Int64Value, int64_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// ListValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry list_value_methods[] = {
+  PHP_ME(ListValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(ListValue, getValues, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(ListValue, setValues, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* list_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\ListValue",
+                                 ListValue, list_value)
+  zend_class_implements(list_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(list_value_type, "values", strlen("values"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(ListValue, __construct) {
+  init_file_struct(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(list_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(ListValue, list_value, Values, "values")
+
+// -----------------------------------------------------------------------------
+// Method
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry method_methods[] = {
+  PHP_ME(Method, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getRequestTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setRequestTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getRequestStreaming, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setRequestStreaming, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getResponseTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setResponseTypeUrl, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getResponseStreaming, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setResponseStreaming, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, getSyntax, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Method, setSyntax, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* method_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Method",
+                                 Method, method)
+  zend_class_implements(method_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(method_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "request_type_url", strlen("request_type_url"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "request_streaming", strlen("request_streaming"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "response_type_url", strlen("response_type_url"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "response_streaming", strlen("response_streaming"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(method_type, "syntax", strlen("syntax"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Method, __construct) {
+  init_file_api(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(method_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Method, method, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, RequestTypeUrl, "request_type_url")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, RequestStreaming, "request_streaming")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, ResponseTypeUrl, "response_type_url")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, ResponseStreaming, "response_streaming")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, Options, "options")
+PHP_PROTO_FIELD_ACCESSORS(Method, method, Syntax, "syntax")
+
+// -----------------------------------------------------------------------------
+// Mixin
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry mixin_methods[] = {
+  PHP_ME(Mixin, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Mixin, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Mixin, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Mixin, getRoot, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Mixin, setRoot, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* mixin_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Mixin",
+                                 Mixin, mixin)
+  zend_class_implements(mixin_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(mixin_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(mixin_type, "root", strlen("root"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Mixin, __construct) {
+  init_file_api(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(mixin_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Mixin, mixin, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Mixin, mixin, Root, "root")
+
+// -----------------------------------------------------------------------------
+// Option
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry option_methods[] = {
+  PHP_ME(Option, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Option, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Option, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Option, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Option, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* option_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Option",
+                                 Option, option)
+  zend_class_implements(option_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(option_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(option_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Option, __construct) {
+  init_file_type(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(option_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Option, option, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Option, option, Value, "value")
+
+// -----------------------------------------------------------------------------
+// SourceContext
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry source_context_methods[] = {
+  PHP_ME(SourceContext, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(SourceContext, getFileName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(SourceContext, setFileName, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* source_context_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\SourceContext",
+                                 SourceContext, source_context)
+  zend_class_implements(source_context_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(source_context_type, "file_name", strlen("file_name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(SourceContext, __construct) {
+  init_file_source_context(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(source_context_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(SourceContext, source_context, FileName, "file_name")
+
+// -----------------------------------------------------------------------------
+// StringValue
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry string_value_methods[] = {
+  PHP_ME(StringValue, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(StringValue, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(StringValue, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* string_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\StringValue",
+                                 StringValue, string_value)
+  zend_class_implements(string_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(string_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(StringValue, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(string_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(StringValue, string_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// Struct
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry struct_methods[] = {
+  PHP_ME(Struct, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Struct, getFields, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Struct, setFields, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* struct_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Struct",
+                                 Struct, struct)
+  zend_class_implements(struct_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(struct_type, "fields", strlen("fields"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Struct, __construct) {
+  init_file_struct(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(struct_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Struct, struct, Fields, "fields")
+
+// -----------------------------------------------------------------------------
+// Type
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry type_methods[] = {
+  PHP_ME(Type, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setName, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getFields, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setFields, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getOneofs, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setOneofs, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setOptions, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setSourceContext, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, getSyntax, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Type, setSyntax, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* type_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Type",
+                                 Type, type)
+  zend_class_implements(type_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(type_type, "name", strlen("name"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(type_type, "fields", strlen("fields"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(type_type, "oneofs", strlen("oneofs"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(type_type, "options", strlen("options"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(type_type, "source_context", strlen("source_context"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+  zend_declare_property_null(type_type, "syntax", strlen("syntax"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Type, __construct) {
+  init_file_type(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(type_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(Type, type, Name, "name")
+PHP_PROTO_FIELD_ACCESSORS(Type, type, Fields, "fields")
+PHP_PROTO_FIELD_ACCESSORS(Type, type, Oneofs, "oneofs")
+PHP_PROTO_FIELD_ACCESSORS(Type, type, Options, "options")
+PHP_PROTO_FIELD_ACCESSORS(Type, type, SourceContext, "source_context")
+PHP_PROTO_FIELD_ACCESSORS(Type, type, Syntax, "syntax")
+
+// -----------------------------------------------------------------------------
+// UInt32Value
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry u_int32_value_methods[] = {
+  PHP_ME(UInt32Value, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(UInt32Value, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(UInt32Value, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* u_int32_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\UInt32Value",
+                                 UInt32Value, u_int32_value)
+  zend_class_implements(u_int32_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(u_int32_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(UInt32Value, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(u_int32_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(UInt32Value, u_int32_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// UInt64Value
+// -----------------------------------------------------------------------------
+
+static  zend_function_entry u_int64_value_methods[] = {
+  PHP_ME(UInt64Value, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(UInt64Value, getValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(UInt64Value, setValue, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* u_int64_value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\UInt64Value",
+                                 UInt64Value, u_int64_value)
+  zend_class_implements(u_int64_value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(u_int64_value_type, "value", strlen("value"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(UInt64Value, __construct) {
+  init_file_wrappers(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(u_int64_value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_FIELD_ACCESSORS(UInt64Value, u_int64_value, Value, "value")
+
+// -----------------------------------------------------------------------------
+// Value
+// -----------------------------------------------------------------------------
+
+static zend_function_entry value_methods[] = {
+  PHP_ME(Value, __construct, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getNullValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setNullValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getNumberValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setNumberValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getStringValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setStringValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getBoolValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setBoolValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getStructValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setStructValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getListValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, setListValue, NULL, ZEND_ACC_PUBLIC)
+  PHP_ME(Value, getKind, NULL, ZEND_ACC_PUBLIC)
+  {NULL, NULL, NULL}
+};
+
+zend_class_entry* value_type;
+
+// Init class entry.
+PHP_PROTO_INIT_SUBMSGCLASS_START("Google\\Protobuf\\Value",
+                                 Value, value)
+  zend_class_implements(value_type TSRMLS_CC, 1, message_type);
+  zend_declare_property_null(value_type, "kind", strlen("kind"),
+                             ZEND_ACC_PRIVATE TSRMLS_CC);
+PHP_PROTO_INIT_SUBMSGCLASS_END
+
+PHP_METHOD(Value, __construct) {
+  init_file_struct(TSRMLS_C);
+  MessageHeader* intern = UNBOX(MessageHeader, getThis());
+  custom_data_init(value_type, intern PHP_PROTO_TSRMLS_CC);
+}
+
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, NullValue, "null_value")
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, NumberValue, "number_value")
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, StringValue, "string_value")
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, BoolValue, "bool_value")
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, StructValue, "struct_value")
+PHP_PROTO_ONEOF_FIELD_ACCESSORS(Value, value, ListValue, "list_value")
+PHP_PROTO_ONEOF_ACCESSORS(Value, value, Kind, "kind")
+
+// -----------------------------------------------------------------------------
+// GPBMetadata files for well known types
+// -----------------------------------------------------------------------------
+
+#define DEFINE_GPBMETADATA_FILE(LOWERNAME, CAMELNAME, CLASSNAME)      \
+  zend_class_entry* gpb_metadata_##LOWERNAME##_type;                  \
+  static zend_function_entry gpb_metadata_##LOWERNAME##_methods[] = { \
+    PHP_ME(GPBMetadata_##CAMELNAME, initOnce, NULL,                   \
+           ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)                         \
+    ZEND_FE_END                                                       \
+  };                                                                  \
+  void gpb_metadata_##LOWERNAME##_init(TSRMLS_D) {                    \
+    zend_class_entry class_type;                                      \
+    INIT_CLASS_ENTRY(class_type, CLASSNAME,                           \
+                     gpb_metadata_##LOWERNAME##_methods);             \
+    gpb_metadata_##LOWERNAME##_type =                                 \
+        zend_register_internal_class(&class_type TSRMLS_CC);          \
+  }                                                                   \
+  PHP_METHOD(GPBMetadata_##CAMELNAME, initOnce) {                     \
+    init_file_##LOWERNAME(TSRMLS_C);                                  \
+  }
+
+DEFINE_GPBMETADATA_FILE(any, Any, "GPBMetadata\\Google\\Protobuf\\Any");
+DEFINE_GPBMETADATA_FILE(api, Api, "GPBMetadata\\Google\\Protobuf\\Api");
+DEFINE_GPBMETADATA_FILE(duration, Duration,
+                        "GPBMetadata\\Google\\Protobuf\\Duration");
+DEFINE_GPBMETADATA_FILE(field_mask, FieldMask,
+                        "GPBMetadata\\Google\\Protobuf\\FieldMask");
+DEFINE_GPBMETADATA_FILE(empty, Empty,
+                        "GPBMetadata\\Google\\Protobuf\\GPBEmpty");
+DEFINE_GPBMETADATA_FILE(source_context, SourceContext,
+                        "GPBMetadata\\Google\\Protobuf\\SourceContext");
+DEFINE_GPBMETADATA_FILE(struct, Struct,
+                        "GPBMetadata\\Google\\Protobuf\\Struct");
+DEFINE_GPBMETADATA_FILE(timestamp, Timestamp,
+                        "GPBMetadata\\Google\\Protobuf\\Timestamp");
+DEFINE_GPBMETADATA_FILE(type, Type, "GPBMetadata\\Google\\Protobuf\\Type");
+DEFINE_GPBMETADATA_FILE(wrappers, Wrappers,
+                        "GPBMetadata\\Google\\Protobuf\\Wrappers");
+
+#undef DEFINE_GPBMETADATA_FILE
diff --git a/php/ext/google/protobuf/package.xml b/php/ext/google/protobuf/package.xml
index aac73d05..3a556acf 100644
--- a/php/ext/google/protobuf/package.xml
+++ b/php/ext/google/protobuf/package.xml
@@ -10,19 +10,19 @@
   <email>protobuf-opensource@google.com</email>
   <active>yes</active>
  </lead>
- <date>2017-01-13</date>
- <time>16:06:07</time>
+ <date>2018-03-06</date>
+ <time>11:02:07</time>
  <version>
-  <release>3.2.0a1</release>
-  <api>3.2.0a1</api>
+  <release>3.5.2</release>
+  <api>3.5.2</api>
  </version>
  <stability>
-  <release>alpha</release>
-  <api>alpha</api>
+  <release>stable</release>
+  <api>stable</api>
  </stability>
  <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
  <notes>
-Second alpha release.
+GA release.
  </notes>
  <contents>
   <dir baseinstalldir="/" name="/">
@@ -40,6 +40,7 @@ Second alpha release.
     <file baseinstalldir="/" name="upb.h" role="src" />
     <file baseinstalldir="/" name="utf8.c" role="src" />
     <file baseinstalldir="/" name="utf8.h" role="src" />
+    <file baseinstalldir="/" name="LICENSE" role="doc" />
   </dir>
  </contents>
  <dependencies>
@@ -87,5 +88,149 @@ First alpha release
 Second alpha release.
    </notes>
   </release>
+  <release>
+   <version>
+    <release>3.3.0</release>
+    <api>3.3.0</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-04-28</date>
+   <time>16:06:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.3.1</release>
+    <api>3.3.0</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-05-08</date>
+   <time>15:33:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.3.2</release>
+    <api>3.3.0</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-06-21</date>
+   <time>15:33:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.4.0</release>
+    <api>3.4.0</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-08-16</date>
+   <time>15:33:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.4.1</release>
+    <api>3.4.1</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-09-14</date>
+   <time>11:02:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.5.0</release>
+    <api>3.5.0</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-11-15</date>
+   <time>11:02:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.5.0.1</release>
+    <api>3.5.0.1</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-12-06</date>
+   <time>11:02:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.5.1</release>
+    <api>3.5.1</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2017-12-11</date>
+   <time>11:02:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+GA release.
+   </notes>
+  </release>
+  <release>
+   <version>
+    <release>3.5.2</release>
+    <api>3.5.2</api>
+   </version>
+   <stability>
+    <release>stable</release>
+    <api>stable</api>
+   </stability>
+   <date>2018-03-06</date>
+   <time>11:02:07</time>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
+   <notes>
+G  A release.
+   </notes>
+  </release>
  </changelog>
 </package>
diff --git a/php/ext/google/protobuf/protobuf.c b/php/ext/google/protobuf/protobuf.c
index ea85b999..da00302f 100644
--- a/php/ext/google/protobuf/protobuf.c
+++ b/php/ext/google/protobuf/protobuf.c
@@ -46,6 +46,10 @@ static HashTable* upb_def_to_php_obj_map;
 // Global map from message/enum's php class entry to corresponding wrapper
 // Descriptor/EnumDescriptor instances.
 static HashTable* ce_to_php_obj_map;
+// Global map from message/enum's proto fully-qualified name to corresponding
+// wrapper Descriptor/EnumDescriptor instances.
+static HashTable* proto_to_php_obj_map;
+static HashTable* reserved_names;
 
 // -----------------------------------------------------------------------------
 // Global maps.
@@ -55,39 +59,134 @@ static void add_to_table(HashTable* t, const void* def, void* value) {
   uint nIndex = (ulong)def & t->nTableMask;
 
   zval* pDest = NULL;
-  zend_hash_index_update(t, (zend_ulong)def, &value, sizeof(zval*), (void**)&pDest);
+  php_proto_zend_hash_index_update_mem(t, (zend_ulong)def, &value,
+                                       sizeof(zval*), (void**)&pDest);
 }
 
 static void* get_from_table(const HashTable* t, const void* def) {
   void** value;
-  if (zend_hash_index_find(t, (zend_ulong)def, (void**)&value) == FAILURE) {
-    zend_error(E_ERROR, "PHP object not found for given definition.\n");
+  if (php_proto_zend_hash_index_find_mem(t, (zend_ulong)def, (void**)&value) ==
+      FAILURE) {
     return NULL;
   }
   return *value;
 }
 
+static bool exist_in_table(const HashTable* t, const void* def) {
+  void** value;
+  return (php_proto_zend_hash_index_find_mem(t, (zend_ulong)def,
+                                             (void**)&value) == SUCCESS);
+}
+
 static void add_to_list(HashTable* t, void* value) {
   zval* pDest = NULL;
-  zend_hash_next_index_insert(t, &value, sizeof(void*), (void**)&pDest);
+  php_proto_zend_hash_next_index_insert_mem(t, &value, sizeof(void*),
+                                        (void**)&pDest);
+}
+
+static void add_to_strtable(HashTable* t, const char* key, int key_size,
+                            void* value) {
+  zval* pDest = NULL;
+  php_proto_zend_hash_update_mem(t, key, key_size, &value, sizeof(void*),
+                                 (void**)&pDest);
 }
 
-void add_def_obj(const void* def, zval* value) {
+static void* get_from_strtable(const HashTable* t, const char* key, int key_size) {
+  void** value;
+  if (php_proto_zend_hash_find_mem(t, key, key_size, (void**)&value) ==
+      FAILURE) {
+    return NULL;
+  }
+  return *value;
+}
+
+void add_def_obj(const void* def, PHP_PROTO_HASHTABLE_VALUE value) {
+#if PHP_MAJOR_VERSION < 7
   Z_ADDREF_P(value);
+#else
+  ++GC_REFCOUNT(value);
+#endif
   add_to_table(upb_def_to_php_obj_map, def, value);
 }
 
-zval* get_def_obj(const void* def) {
-  return (zval*)get_from_table(upb_def_to_php_obj_map, def);
+PHP_PROTO_HASHTABLE_VALUE get_def_obj(const void* def) {
+  return (PHP_PROTO_HASHTABLE_VALUE)get_from_table(upb_def_to_php_obj_map, def);
 }
 
-void add_ce_obj(const void* ce, zval* value) {
+void add_ce_obj(const void* ce, PHP_PROTO_HASHTABLE_VALUE value) {
+#if PHP_MAJOR_VERSION < 7
   Z_ADDREF_P(value);
+#else
+  ++GC_REFCOUNT(value);
+#endif
   add_to_table(ce_to_php_obj_map, ce, value);
 }
 
-zval* get_ce_obj(const void* ce) {
-  return (zval*)get_from_table(ce_to_php_obj_map, ce);
+PHP_PROTO_HASHTABLE_VALUE get_ce_obj(const void* ce) {
+  return (PHP_PROTO_HASHTABLE_VALUE)get_from_table(ce_to_php_obj_map, ce);
+}
+
+bool class_added(const void* ce) {
+  return exist_in_table(ce_to_php_obj_map, ce);
+}
+
+void add_proto_obj(const char* proto, PHP_PROTO_HASHTABLE_VALUE value) {
+#if PHP_MAJOR_VERSION < 7
+  Z_ADDREF_P(value);
+#else
+  ++GC_REFCOUNT(value);
+#endif
+  add_to_strtable(proto_to_php_obj_map, proto, strlen(proto), value);
+}
+
+PHP_PROTO_HASHTABLE_VALUE get_proto_obj(const char* proto) {
+  return (PHP_PROTO_HASHTABLE_VALUE)get_from_strtable(proto_to_php_obj_map,
+                                                      proto, strlen(proto));
+}
+
+// -----------------------------------------------------------------------------
+// Well Known Types.
+// -----------------------------------------------------------------------------
+
+bool is_inited_file_any;
+bool is_inited_file_api;
+bool is_inited_file_duration;
+bool is_inited_file_field_mask;
+bool is_inited_file_empty;
+bool is_inited_file_source_context;
+bool is_inited_file_struct;
+bool is_inited_file_timestamp;
+bool is_inited_file_type;
+bool is_inited_file_wrappers;
+
+// -----------------------------------------------------------------------------
+// Reserved Name.
+// -----------------------------------------------------------------------------
+
+// Although we already have kReservedNames, we still add them to hash table to
+// speed up look up.
+const char *const kReservedNames[] = {
+    "abstract",   "and",        "array",        "as",           "break",
+    "callable",   "case",       "catch",        "class",        "clone",
+    "const",      "continue",   "declare",      "default",      "die",
+    "do",         "echo",       "else",         "elseif",       "empty",
+    "enddeclare", "endfor",     "endforeach",   "endif",        "endswitch",
+    "endwhile",   "eval",       "exit",         "extends",      "final",
+    "for",        "foreach",    "function",     "global",       "goto",
+    "if",         "implements", "include",      "include_once", "instanceof",
+    "insteadof",  "interface",  "isset",        "list",         "namespace",
+    "new",        "or",         "print",        "private",      "protected",
+    "public",     "require",    "require_once", "return",       "static",
+    "switch",     "throw",      "trait",        "try",          "unset",
+    "use",        "var",        "while",        "xor",          "int",
+    "float",      "bool",       "string",       "true",         "false",
+    "null",       "void",       "iterable"};
+const int kReservedNamesSize = 73;
+
+bool is_reserved_name(const char* name) {
+  void** value;
+  return (php_proto_zend_hash_find(reserved_names, name, strlen(name),
+                                   (void**)&value) == SUCCESS);
 }
 
 // -----------------------------------------------------------------------------
@@ -98,8 +197,15 @@ zend_function_entry protobuf_functions[] = {
   ZEND_FE_END
 };
 
+static const zend_module_dep protobuf_deps[] = {
+  ZEND_MOD_OPTIONAL("date")
+  ZEND_MOD_END
+};
+
 zend_module_entry protobuf_module_entry = {
-  STANDARD_MODULE_HEADER,
+  STANDARD_MODULE_HEADER_EX,
+  NULL,
+  protobuf_deps,
   PHP_PROTOBUF_EXTNAME,     // extension name
   protobuf_functions,       // function list
   PHP_MINIT(protobuf),      // process startup
@@ -125,15 +231,50 @@ static PHP_GINIT_FUNCTION(protobuf) {
 static PHP_GSHUTDOWN_FUNCTION(protobuf) {
 }
 
+#if PHP_MAJOR_VERSION >= 7
+static void php_proto_hashtable_descriptor_release(zval* value) {
+  void* ptr = Z_PTR_P(value);
+  zend_object* object = *(zend_object**)ptr;
+  if(--GC_REFCOUNT(object) == 0) {
+    zend_objects_store_del(object);
+  }
+  efree(ptr);
+}
+#endif
+
 static PHP_RINIT_FUNCTION(protobuf) {
+  int i = 0;
+
   ALLOC_HASHTABLE(upb_def_to_php_obj_map);
-  zend_hash_init(upb_def_to_php_obj_map, 16, NULL, ZVAL_PTR_DTOR, 0);
+  zend_hash_init(upb_def_to_php_obj_map, 16, NULL, HASHTABLE_VALUE_DTOR, 0);
 
   ALLOC_HASHTABLE(ce_to_php_obj_map);
-  zend_hash_init(ce_to_php_obj_map, 16, NULL, ZVAL_PTR_DTOR, 0);
+  zend_hash_init(ce_to_php_obj_map, 16, NULL, HASHTABLE_VALUE_DTOR, 0);
+
+  ALLOC_HASHTABLE(proto_to_php_obj_map);
+  zend_hash_init(proto_to_php_obj_map, 16, NULL, HASHTABLE_VALUE_DTOR, 0);
+
+  ALLOC_HASHTABLE(reserved_names);
+  zend_hash_init(reserved_names, 16, NULL, NULL, 0);
+  for (i = 0; i < kReservedNamesSize; i++) {
+    php_proto_zend_hash_update(reserved_names, kReservedNames[i],
+                               strlen(kReservedNames[i]));
+  }
 
   generated_pool = NULL;
   generated_pool_php = NULL;
+  internal_generated_pool_php = NULL;
+
+  is_inited_file_any = false;
+  is_inited_file_api = false;
+  is_inited_file_duration = false;
+  is_inited_file_field_mask = false;
+  is_inited_file_empty = false;
+  is_inited_file_source_context = false;
+  is_inited_file_struct = false;
+  is_inited_file_timestamp = false;
+  is_inited_file_type = false;
+  is_inited_file_wrappers = false;
 
   return 0;
 }
@@ -145,32 +286,115 @@ static PHP_RSHUTDOWN_FUNCTION(protobuf) {
   zend_hash_destroy(ce_to_php_obj_map);
   FREE_HASHTABLE(ce_to_php_obj_map);
 
+  zend_hash_destroy(proto_to_php_obj_map);
+  FREE_HASHTABLE(proto_to_php_obj_map);
+
+  zend_hash_destroy(reserved_names);
+  FREE_HASHTABLE(reserved_names);
+
+#if PHP_MAJOR_VERSION < 7
   if (generated_pool_php != NULL) {
     zval_dtor(generated_pool_php);
     FREE_ZVAL(generated_pool_php);
   }
+  if (internal_generated_pool_php != NULL) {
+    zval_dtor(internal_generated_pool_php);
+    FREE_ZVAL(internal_generated_pool_php);
+  }
+#else
+  if (generated_pool_php != NULL) {
+    zval tmp;
+    ZVAL_OBJ(&tmp, generated_pool_php);
+    zval_dtor(&tmp);
+  }
+  if (internal_generated_pool_php != NULL) {
+    zval tmp;
+    ZVAL_OBJ(&tmp, internal_generated_pool_php);
+    zval_dtor(&tmp);
+  }
+#endif
+
+  is_inited_file_any = true;
+  is_inited_file_api = true;
+  is_inited_file_duration = true;
+  is_inited_file_field_mask = true;
+  is_inited_file_empty = true;
+  is_inited_file_source_context = true;
+  is_inited_file_struct = true;
+  is_inited_file_timestamp = true;
+  is_inited_file_type = true;
+  is_inited_file_wrappers = true;
 
   return 0;
 }
 
 static PHP_MINIT_FUNCTION(protobuf) {
-  map_field_init(TSRMLS_C);
-  repeated_field_init(TSRMLS_C);
-  repeated_field_iter_init(TSRMLS_C);
-  gpb_type_init(TSRMLS_C);
-  message_init(TSRMLS_C);
   descriptor_pool_init(TSRMLS_C);
   descriptor_init(TSRMLS_C);
   enum_descriptor_init(TSRMLS_C);
+  enum_value_descriptor_init(TSRMLS_C);
+  field_descriptor_init(TSRMLS_C);
+  gpb_type_init(TSRMLS_C);
+  internal_descriptor_pool_init(TSRMLS_C);
+  map_field_init(TSRMLS_C);
+  map_field_iter_init(TSRMLS_C);
+  message_init(TSRMLS_C);
+  oneof_descriptor_init(TSRMLS_C);
+  repeated_field_init(TSRMLS_C);
+  repeated_field_iter_init(TSRMLS_C);
   util_init(TSRMLS_C);
 
+  gpb_metadata_any_init(TSRMLS_C);
+  gpb_metadata_api_init(TSRMLS_C);
+  gpb_metadata_duration_init(TSRMLS_C);
+  gpb_metadata_field_mask_init(TSRMLS_C);
+  gpb_metadata_empty_init(TSRMLS_C);
+  gpb_metadata_source_context_init(TSRMLS_C);
+  gpb_metadata_struct_init(TSRMLS_C);
+  gpb_metadata_timestamp_init(TSRMLS_C);
+  gpb_metadata_type_init(TSRMLS_C);
+  gpb_metadata_wrappers_init(TSRMLS_C);
+
+  any_init(TSRMLS_C);
+  api_init(TSRMLS_C);
+  bool_value_init(TSRMLS_C);
+  bytes_value_init(TSRMLS_C);
+  double_value_init(TSRMLS_C);
+  duration_init(TSRMLS_C);
+  enum_init(TSRMLS_C);
+  enum_value_init(TSRMLS_C);
+  field_cardinality_init(TSRMLS_C);
+  field_init(TSRMLS_C);
+  field_kind_init(TSRMLS_C);
+  field_mask_init(TSRMLS_C);
+  float_value_init(TSRMLS_C);
+  empty_init(TSRMLS_C);
+  int32_value_init(TSRMLS_C);
+  int64_value_init(TSRMLS_C);
+  list_value_init(TSRMLS_C);
+  method_init(TSRMLS_C);
+  mixin_init(TSRMLS_C);
+  null_value_init(TSRMLS_C);
+  option_init(TSRMLS_C);
+  source_context_init(TSRMLS_C);
+  string_value_init(TSRMLS_C);
+  struct_init(TSRMLS_C);
+  syntax_init(TSRMLS_C);
+  timestamp_init(TSRMLS_C);
+  type_init(TSRMLS_C);
+  u_int32_value_init(TSRMLS_C);
+  u_int64_value_init(TSRMLS_C);
+  value_init(TSRMLS_C);
+
   return 0;
 }
 
 static PHP_MSHUTDOWN_FUNCTION(protobuf) {
   PEFREE(message_handlers);
   PEFREE(repeated_field_handlers);
+  PEFREE(repeated_field_iter_handlers);
   PEFREE(map_field_handlers);
+  PEFREE(map_field_iter_handlers);
 
   return 0;
 }
diff --git a/php/ext/google/protobuf/protobuf.h b/php/ext/google/protobuf/protobuf.h
index 28cea95c..c15bde2d 100644
--- a/php/ext/google/protobuf/protobuf.h
+++ b/php/ext/google/protobuf/protobuf.h
@@ -37,36 +37,620 @@
 #include "upb.h"
 
 #define PHP_PROTOBUF_EXTNAME "protobuf"
-#define PHP_PROTOBUF_VERSION "3.2.0a1"
+#define PHP_PROTOBUF_VERSION "3.5.2"
 
 #define MAX_LENGTH_OF_INT64 20
 #define SIZEOF_INT64 8
 
 // -----------------------------------------------------------------------------
+// PHP7 Wrappers
+// ----------------------------------------------------------------------------
+
+#if PHP_MAJOR_VERSION < 7
+
+#define php_proto_zend_literal const zend_literal*
+#define PHP_PROTO_CASE_IS_BOOL IS_BOOL
+#define PHP_PROTO_SIZE int
+#define PHP_PROTO_LONG long
+#define PHP_PROTO_TSRMLS_DC TSRMLS_DC
+#define PHP_PROTO_TSRMLS_CC TSRMLS_CC
+
+// PHP String
+
+#define PHP_PROTO_ZVAL_STRING(zval_ptr, s, copy) \
+  ZVAL_STRING(zval_ptr, s, copy)
+#define PHP_PROTO_ZVAL_STRINGL(zval_ptr, s, len, copy) \
+  ZVAL_STRINGL(zval_ptr, s, len, copy)
+#define PHP_PROTO_RETURN_STRING(s, copy) RETURN_STRING(s, copy)
+#define PHP_PROTO_RETURN_STRINGL(s, len, copy) RETURN_STRINGL(s, len, copy)
+#define PHP_PROTO_RETVAL_STRINGL(s, len, copy) RETVAL_STRINGL(s, len, copy)
+#define php_proto_zend_make_printable_zval(from, to) \
+  {                                                  \
+    int use_copy;                                    \
+    zend_make_printable_zval(from, to, &use_copy);   \
+  }
+
+// PHP Array
+
+#define PHP_PROTO_HASH_OF(array) Z_ARRVAL_P(array)
+
+#define php_proto_zend_hash_index_update_zval(ht, h, pData) \
+  zend_hash_index_update(ht, h, &(pData), sizeof(void*), NULL)
+
+#define php_proto_zend_hash_update_zval(ht, key, key_len, value) \
+  zend_hash_update(ht, key, key_len, value, sizeof(void*), NULL)
+
+#define php_proto_zend_hash_update(ht, key, key_len) \
+  zend_hash_update(ht, key, key_len, 0, 0, NULL)
+
+#define php_proto_zend_hash_index_update_mem(ht, h, pData, nDataSize, pDest) \
+  zend_hash_index_update(ht, h, pData, nDataSize, pDest)
+
+#define php_proto_zend_hash_update_mem(ht, key, key_len, pData, nDataSize, \
+                                       pDest)                              \
+  zend_hash_update(ht, key, key_len, pData, nDataSize, pDest)
+
+#define php_proto_zend_hash_index_find_zval(ht, h, pDest) \
+  zend_hash_index_find(ht, h, pDest)
+
+#define php_proto_zend_hash_find(ht, key, key_len, pDest) \
+  zend_hash_find(ht, key, key_len, pDest)
+
+#define php_proto_zend_hash_index_find_mem(ht, h, pDest) \
+  zend_hash_index_find(ht, h, pDest)
+
+#define php_proto_zend_hash_find_zval(ht, key, key_len, pDest) \
+  zend_hash_find(ht, key, key_len, pDest)
+
+#define php_proto_zend_hash_find_mem(ht, key, key_len, pDest) \
+  zend_hash_find(ht, key, key_len, pDest)
+
+#define php_proto_zend_hash_next_index_insert_zval(ht, pData) \
+  zend_hash_next_index_insert(ht, pData, sizeof(void*), NULL)
+
+#define php_proto_zend_hash_next_index_insert_mem(ht, pData, nDataSize, pDest) \
+  zend_hash_next_index_insert(ht, pData, nDataSize, pDest)
+
+#define php_proto_zend_hash_get_current_data_ex(ht, pDest, pos) \
+  zend_hash_get_current_data_ex(ht, pDest, pos)
+
+// PHP Object
+
+#define PHP_PROTO_WRAP_OBJECT_START(name) \
+  struct name {                           \
+    zend_object std;
+#define PHP_PROTO_WRAP_OBJECT_END \
+  };
+
+#define PHP_PROTO_INIT_SUBMSGCLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)   \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC); \
+    LOWWERNAME##_type->create_object = message_create;
+#define PHP_PROTO_INIT_SUBMSGCLASS_END \
+  }
+
+#define PHP_PROTO_INIT_ENUMCLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)     \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC);
+#define PHP_PROTO_INIT_ENUMCLASS_END \
+  }
+
+#define PHP_PROTO_INIT_CLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)         \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC); \
+    LOWWERNAME##_type->create_object = LOWWERNAME##_create;                  \
+    LOWWERNAME##_handlers = PEMALLOC(zend_object_handlers);                  \
+    memcpy(LOWWERNAME##_handlers, zend_get_std_object_handlers(),            \
+           sizeof(zend_object_handlers));
+#define PHP_PROTO_INIT_CLASS_END \
+  }
+
+#define PHP_PROTO_OBJECT_CREATE_START(NAME, LOWWERNAME) \
+  static zend_object_value LOWWERNAME##_create(         \
+      zend_class_entry* ce TSRMLS_DC) {                 \
+    PHP_PROTO_ALLOC_CLASS_OBJECT(NAME, ce);             \
+    zend_object_std_init(&intern->std, ce TSRMLS_CC);   \
+    object_properties_init(&intern->std, ce);
+#define PHP_PROTO_OBJECT_CREATE_END(NAME, LOWWERNAME)                          \
+  PHP_PROTO_FREE_CLASS_OBJECT(NAME, LOWWERNAME##_free, LOWWERNAME##_handlers); \
+  }
+
+#define PHP_PROTO_OBJECT_FREE_START(classname, lowername) \
+  void lowername##_free(void* object TSRMLS_DC) {         \
+    classname* intern = object;
+#define PHP_PROTO_OBJECT_FREE_END                 \
+    zend_object_std_dtor(&intern->std TSRMLS_CC); \
+    efree(intern);                                \
+  }
+
+#define PHP_PROTO_OBJECT_DTOR_START(classname, lowername)
+#define PHP_PROTO_OBJECT_DTOR_END
+
+#define CACHED_VALUE zval*
+#define CACHED_TO_ZVAL_PTR(VALUE) (VALUE)
+#define CACHED_PTR_TO_ZVAL_PTR(VALUE) (*VALUE)
+#define ZVAL_PTR_TO_CACHED_PTR(VALUE) (&VALUE)
+#define ZVAL_PTR_TO_CACHED_VALUE(VALUE) (VALUE)
+#define ZVAL_TO_CACHED_VALUE(VALUE) (&VALUE)
+
+#define CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(zval_ptr, class_type) \
+  ZVAL_OBJ(zval_ptr, class_type->create_object(class_type TSRMLS_CC));
+
+#define PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(value) \
+  SEPARATE_ZVAL_IF_NOT_REF(value)
+
+#define PHP_PROTO_GLOBAL_UNINITIALIZED_ZVAL EG(uninitialized_zval_ptr)
+
+#define OBJ_PROP(OBJECT, OFFSET) &((OBJECT)->properties_table[OFFSET])
+
+#define php_proto_zval_ptr_dtor(zval_ptr) \
+  zval_ptr_dtor(&(zval_ptr))
+
+#define PHP_PROTO_ALLOC_CLASS_OBJECT(class_object, class_type) \
+  class_object* intern;                                        \
+  intern = (class_object*)emalloc(sizeof(class_object));       \
+  memset(intern, 0, sizeof(class_object));
+
+#define PHP_PROTO_FREE_CLASS_OBJECT(class_object, class_object_free, handler) \
+  zend_object_value retval = {0};                                             \
+  retval.handle = zend_objects_store_put(                                     \
+      intern, (zend_objects_store_dtor_t)zend_objects_destroy_object,         \
+      class_object_free, NULL TSRMLS_CC);                                     \
+  retval.handlers = handler;                                                  \
+  return retval;
+
+#define PHP_PROTO_ALLOC_ARRAY(zval_ptr)  \
+  ALLOC_HASHTABLE(Z_ARRVAL_P(zval_ptr)); \
+  Z_TYPE_P(zval_ptr) = IS_ARRAY;
+
+#define ZVAL_OBJ(zval_ptr, call_create) \
+  Z_TYPE_P(zval_ptr) = IS_OBJECT;       \
+  Z_OBJVAL_P(zval_ptr) = call_create;
+
+#define UNBOX(class_name, val) \
+  (class_name*)zend_object_store_get_object(val TSRMLS_CC);
+
+#define UNBOX_HASHTABLE_VALUE(class_name, val) UNBOX(class_name, val)
+
+#define HASHTABLE_VALUE_DTOR ZVAL_PTR_DTOR
+
+#define PHP_PROTO_HASHTABLE_VALUE zval*
+#define HASHTABLE_VALUE_CE(val) Z_OBJCE_P(val)
+
+#define CREATE_HASHTABLE_VALUE(OBJ, WRAPPED_OBJ, OBJ_TYPE, OBJ_CLASS_ENTRY) \
+  OBJ_TYPE* OBJ;                                                            \
+  PHP_PROTO_HASHTABLE_VALUE WRAPPED_OBJ;                                    \
+  MAKE_STD_ZVAL(WRAPPED_OBJ);                                               \
+  ZVAL_OBJ(WRAPPED_OBJ,                                                     \
+           OBJ_CLASS_ENTRY->create_object(OBJ_CLASS_ENTRY TSRMLS_CC));      \
+  OBJ = UNBOX_HASHTABLE_VALUE(OBJ_TYPE, WRAPPED_OBJ);                       \
+  Z_DELREF_P(desc_php);
+
+#define PHP_PROTO_CE_DECLARE zend_class_entry**
+#define PHP_PROTO_CE_UNREF(ce) (*ce)
+
+#define php_proto_zend_lookup_class(name, name_length, ce) \
+  zend_lookup_class(name, name_length, ce TSRMLS_CC)
+
+#define PHP_PROTO_RETVAL_ZVAL(value) ZVAL_ZVAL(return_value, value, 1, 0)
+
+#else  // PHP_MAJOR_VERSION >= 7
+
+#define php_proto_zend_literal void**
+#define PHP_PROTO_CASE_IS_BOOL IS_TRUE: case IS_FALSE
+#define PHP_PROTO_SIZE size_t
+#define PHP_PROTO_LONG zend_long
+#define PHP_PROTO_TSRMLS_DC
+#define PHP_PROTO_TSRMLS_CC
+
+// PHP String
+
+#define PHP_PROTO_ZVAL_STRING(zval_ptr, s, copy) \
+  ZVAL_STRING(zval_ptr, s)
+#define PHP_PROTO_ZVAL_STRINGL(zval_ptr, s, len, copy) \
+  ZVAL_STRINGL(zval_ptr, s, len)
+#define PHP_PROTO_RETURN_STRING(s, copy) RETURN_STRING(s)
+#define PHP_PROTO_RETURN_STRINGL(s, len, copy) RETURN_STRINGL(s, len)
+#define PHP_PROTO_RETVAL_STRINGL(s, len, copy) RETVAL_STRINGL(s, len)
+#define php_proto_zend_make_printable_zval(from, to) \
+  zend_make_printable_zval(from, to)
+
+// PHP Array
+
+#define PHP_PROTO_HASH_OF(array) Z_ARRVAL_P(&array)
+
+static inline int php_proto_zend_hash_index_update_zval(HashTable* ht, ulong h,
+                                                        zval* pData) {
+  void* result = NULL;
+  result = zend_hash_index_update(ht, h, pData);
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_update(HashTable* ht, const char* key,
+                                             size_t key_len) {
+  void* result = NULL;
+  zval temp;
+  ZVAL_LONG(&temp, 0);
+  result = zend_hash_str_update(ht, key, key_len, &temp);
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_index_update_mem(HashTable* ht, ulong h,
+                                                   void* pData, uint nDataSize,
+                                                   void** pDest) {
+  void* result = NULL;
+  result = zend_hash_index_update_mem(ht, h, pData, nDataSize);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_update_zval(HashTable* ht,
+                                                  const char* key, uint key_len,
+                                                  zval* pData) {
+  zend_string* internal_key = zend_string_init(key, key_len, 0);
+  zend_hash_update(ht, internal_key, pData);
+}
+
+static inline int php_proto_zend_hash_update_mem(HashTable* ht, const char* key,
+                                                 uint key_len, void* pData,
+                                                 uint nDataSize, void** pDest) {
+  zend_string* internal_key = zend_string_init(key, key_len, 0);
+  void* result = zend_hash_update_mem(ht, internal_key, pData, nDataSize);
+  zend_string_release(internal_key);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_index_find_zval(const HashTable* ht,
+                                                      ulong h, void** pDest) {
+  zval* result = zend_hash_index_find(ht, h);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_find(const HashTable* ht, const char* key,
+                                           size_t key_len, void** pDest) {
+  void* result = NULL;
+  result = zend_hash_str_find(ht, key, key_len);
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_index_find_mem(const HashTable* ht,
+                                                     ulong h, void** pDest) {
+  void* result = NULL;
+  result = zend_hash_index_find_ptr(ht, h);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_find_zval(const HashTable* ht,
+                                                const char* key, uint key_len,
+                                                void** pDest) {
+  zend_string* internal_key = zend_string_init(key, key_len, 1);
+  zval* result = zend_hash_find(ht, internal_key);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_find_mem(const HashTable* ht,
+                                                const char* key, uint key_len,
+                                                void** pDest) {
+  zend_string* internal_key = zend_string_init(key, key_len, 1);
+  void* result = zend_hash_find_ptr(ht, internal_key);
+  zend_string_release(internal_key);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_next_index_insert_zval(HashTable* ht,
+                                                             void* pData) {
+  zval tmp;
+  ZVAL_OBJ(&tmp, *(zend_object**)pData);
+  zval* result = zend_hash_next_index_insert(ht, &tmp);
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_next_index_insert_mem(HashTable* ht,
+                                                            void* pData,
+                                                            uint nDataSize,
+                                                            void** pDest) {
+  void* result = NULL;
+  result = zend_hash_next_index_insert_mem(ht, pData, nDataSize);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+static inline int php_proto_zend_hash_get_current_data_ex(HashTable* ht,
+                                                          void** pDest,
+                                                          HashPosition* pos) {
+  void* result = NULL;
+  result = zend_hash_get_current_data_ex(ht, pos);
+  if (pDest != NULL) *pDest = result;
+  return result != NULL ? SUCCESS : FAILURE;
+}
+
+// PHP Object
+
+#define PHP_PROTO_WRAP_OBJECT_START(name) struct name {
+#define PHP_PROTO_WRAP_OBJECT_END \
+  zend_object std;                \
+  };
+
+#define PHP_PROTO_INIT_SUBMSGCLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)   \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC); \
+    LOWWERNAME##_type->create_object = message_create;
+#define PHP_PROTO_INIT_SUBMSGCLASS_END \
+  }
+
+#define PHP_PROTO_INIT_ENUMCLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)     \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC);
+#define PHP_PROTO_INIT_ENUMCLASS_END \
+  }
+
+#define PHP_PROTO_INIT_CLASS_START(CLASSNAME, CAMELNAME, LOWWERNAME)         \
+  void LOWWERNAME##_init(TSRMLS_D) {                                         \
+    zend_class_entry class_type;                                             \
+    const char* class_name = CLASSNAME;                                      \
+    INIT_CLASS_ENTRY_EX(class_type, CLASSNAME, strlen(CLASSNAME),            \
+                        LOWWERNAME##_methods);                               \
+    LOWWERNAME##_type = zend_register_internal_class(&class_type TSRMLS_CC); \
+    LOWWERNAME##_type->create_object = LOWWERNAME##_create;                  \
+    LOWWERNAME##_handlers = PEMALLOC(zend_object_handlers);                  \
+    memcpy(LOWWERNAME##_handlers, zend_get_std_object_handlers(),            \
+           sizeof(zend_object_handlers));                                    \
+    LOWWERNAME##_handlers->free_obj = LOWWERNAME##_free;                     \
+    LOWWERNAME##_handlers->dtor_obj = LOWWERNAME##_dtor;                     \
+    LOWWERNAME##_handlers->offset = XtOffsetOf(CAMELNAME, std);
+#define PHP_PROTO_INIT_CLASS_END \
+  }
+
+#define PHP_PROTO_OBJECT_FREE_START(classname, lowername) \
+  void lowername##_free(zend_object* object) {            \
+    classname* intern =                                   \
+        (classname*)((char*)object - XtOffsetOf(classname, std));
+#define PHP_PROTO_OBJECT_FREE_END           \
+  }
+
+#define PHP_PROTO_OBJECT_DTOR_START(classname, lowername) \
+  void lowername##_dtor(zend_object* object) {            \
+    classname* intern =                                   \
+        (classname*)((char*)object - XtOffsetOf(classname, std));
+#define PHP_PROTO_OBJECT_DTOR_END           \
+    zend_object_std_dtor(object TSRMLS_CC); \
+  }
+
+#define PHP_PROTO_OBJECT_CREATE_START(NAME, LOWWERNAME)                     \
+  static zend_object* LOWWERNAME##_create(zend_class_entry* ce TSRMLS_DC) { \
+    PHP_PROTO_ALLOC_CLASS_OBJECT(NAME, ce);                                 \
+    zend_object_std_init(&intern->std, ce TSRMLS_CC);                       \
+    object_properties_init(&intern->std, ce);
+#define PHP_PROTO_OBJECT_CREATE_END(NAME, LOWWERNAME)                          \
+  PHP_PROTO_FREE_CLASS_OBJECT(NAME, LOWWERNAME##_free, LOWWERNAME##_handlers); \
+  }
+
+#define CACHED_VALUE zval
+#define CACHED_TO_ZVAL_PTR(VALUE) (&VALUE)
+#define CACHED_PTR_TO_ZVAL_PTR(VALUE) (VALUE)
+#define ZVAL_PTR_TO_CACHED_PTR(VALUE) (VALUE)
+#define ZVAL_PTR_TO_CACHED_VALUE(VALUE) (*VALUE)
+#define ZVAL_TO_CACHED_VALUE(VALUE) (VALUE)
+
+#define CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(zval_ptr, class_type) \
+  ZVAL_OBJ(zval_ptr, class_type->create_object(class_type));
+
+#define PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(value) ;
+
+#define PHP_PROTO_GLOBAL_UNINITIALIZED_ZVAL &EG(uninitialized_zval)
+
+#define php_proto_zval_ptr_dtor(zval_ptr) \
+  zval_ptr_dtor(zval_ptr)
+
+#define PHP_PROTO_ALLOC_CLASS_OBJECT(class_object, class_type)               \
+  class_object* intern;                                                      \
+  int size = sizeof(class_object) + zend_object_properties_size(class_type); \
+  intern = ecalloc(1, size);                                                 \
+  memset(intern, 0, size);
+
+#define PHP_PROTO_FREE_CLASS_OBJECT(class_object, class_object_free, handler) \
+  intern->std.handlers = handler;                                             \
+  return &intern->std;
+
+#define PHP_PROTO_ALLOC_ARRAY(zval_ptr) \
+  ZVAL_NEW_ARR(zval_ptr)
+
+#define UNBOX(class_name, val) \
+  (class_name*)((char*)Z_OBJ_P(val) - XtOffsetOf(class_name, std));
+
+#define UNBOX_HASHTABLE_VALUE(class_name, val) \
+  (class_name*)((char*)val - XtOffsetOf(class_name, std))
+
+#define HASHTABLE_VALUE_DTOR php_proto_hashtable_descriptor_release
+
+#define PHP_PROTO_HASHTABLE_VALUE zend_object*
+#define HASHTABLE_VALUE_CE(val) val->ce
+
+#define CREATE_HASHTABLE_VALUE(OBJ, WRAPPED_OBJ, OBJ_TYPE, OBJ_CLASS_ENTRY) \
+  OBJ_TYPE* OBJ;                                                            \
+  PHP_PROTO_HASHTABLE_VALUE WRAPPED_OBJ;                                    \
+  WRAPPED_OBJ = OBJ_CLASS_ENTRY->create_object(OBJ_CLASS_ENTRY);            \
+  OBJ = UNBOX_HASHTABLE_VALUE(OBJ_TYPE, WRAPPED_OBJ);                       \
+  --GC_REFCOUNT(WRAPPED_OBJ);
+
+#define PHP_PROTO_CE_DECLARE zend_class_entry*
+#define PHP_PROTO_CE_UNREF(ce) (ce)
+
+static inline int php_proto_zend_lookup_class(
+    const char* name, int name_length, zend_class_entry** ce TSRMLS_DC) {
+  zend_string *zstr_name = zend_string_init(name, name_length, 0);
+  *ce = zend_lookup_class(zstr_name);
+  zend_string_release(zstr_name);
+  return *ce != NULL ? SUCCESS : FAILURE;
+}
+
+#define PHP_PROTO_RETVAL_ZVAL(value) ZVAL_COPY(return_value, value)
+
+#endif  // PHP_MAJOR_VERSION >= 7
+
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
+#define PHP_PROTO_FAKE_SCOPE_BEGIN(klass)  \
+  zend_class_entry* old_scope = EG(scope); \
+  EG(scope) = klass;
+#define PHP_PROTO_FAKE_SCOPE_RESTART(klass) \
+  old_scope = EG(scope);                    \
+  EG(scope) = klass;
+#define PHP_PROTO_FAKE_SCOPE_END EG(scope) = old_scope;
+#else
+#define PHP_PROTO_FAKE_SCOPE_BEGIN(klass)       \
+  zend_class_entry* old_scope = EG(fake_scope); \
+  EG(fake_scope) = klass;
+#define PHP_PROTO_FAKE_SCOPE_RESTART(klass) \
+  old_scope = EG(fake_scope);               \
+  EG(fake_scope) = klass;
+#define PHP_PROTO_FAKE_SCOPE_END EG(fake_scope) = old_scope;
+#endif
+
+// Define PHP class
+#define DEFINE_PROTOBUF_INIT_CLASS(CLASSNAME, CAMELNAME, LOWERNAME) \
+  PHP_PROTO_INIT_CLASS_START(CLASSNAME, CAMELNAME, LOWERNAME)       \
+  PHP_PROTO_INIT_CLASS_END
+
+#define DEFINE_PROTOBUF_CREATE(NAME, LOWERNAME)  \
+  PHP_PROTO_OBJECT_CREATE_START(NAME, LOWERNAME) \
+  LOWERNAME##_init_c_instance(intern TSRMLS_CC); \
+  PHP_PROTO_OBJECT_CREATE_END(NAME, LOWERNAME)
+
+#define DEFINE_PROTOBUF_FREE(CAMELNAME, LOWERNAME)  \
+  PHP_PROTO_OBJECT_FREE_START(CAMELNAME, LOWERNAME) \
+  LOWERNAME##_free_c(intern TSRMLS_CC);             \
+  PHP_PROTO_OBJECT_FREE_END
+
+#define DEFINE_PROTOBUF_DTOR(CAMELNAME, LOWERNAME)  \
+  PHP_PROTO_OBJECT_DTOR_START(CAMELNAME, LOWERNAME) \
+  PHP_PROTO_OBJECT_DTOR_END
+
+#define DEFINE_CLASS(NAME, LOWERNAME, string_name) \
+  zend_class_entry *LOWERNAME##_type;              \
+  zend_object_handlers *LOWERNAME##_handlers;      \
+  DEFINE_PROTOBUF_FREE(NAME, LOWERNAME)            \
+  DEFINE_PROTOBUF_DTOR(NAME, LOWERNAME)            \
+  DEFINE_PROTOBUF_CREATE(NAME, LOWERNAME)          \
+  DEFINE_PROTOBUF_INIT_CLASS(string_name, NAME, LOWERNAME)
+
+// -----------------------------------------------------------------------------
 // Forward Declaration
 // ----------------------------------------------------------------------------
 
-struct DescriptorPool;
+struct Any;
+struct Api;
+struct BoolValue;
+struct BytesValue;
 struct Descriptor;
+struct DescriptorPool;
+struct DoubleValue;
+struct Duration;
+struct Enum;
 struct EnumDescriptor;
+struct EnumValue;
+struct EnumValueDescriptor;
+struct Field;
 struct FieldDescriptor;
+struct FieldMask;
+struct Field_Cardinality;
+struct Field_Kind;
+struct FloatValue;
+struct GPBEmpty;
+struct Int32Value;
+struct Int64Value;
+struct InternalDescriptorPool;
+struct ListValue;
+struct Map;
+struct MapIter;
 struct MessageField;
 struct MessageHeader;
 struct MessageLayout;
+struct Method;
+struct Mixin;
+struct NullValue;
+struct Oneof;
+struct Option;
 struct RepeatedField;
 struct RepeatedFieldIter;
-struct MapField;
-
-typedef struct DescriptorPool DescriptorPool;
+struct SourceContext;
+struct StringValue;
+struct Struct;
+struct Syntax;
+struct Timestamp;
+struct Type;
+struct UInt32Value;
+struct UInt64Value;
+struct Value;
+
+typedef struct Any Any;
+typedef struct Api Api;
+typedef struct BoolValue BoolValue;
+typedef struct BytesValue BytesValue;
 typedef struct Descriptor Descriptor;
+typedef struct DescriptorPool DescriptorPool;
+typedef struct DoubleValue DoubleValue;
+typedef struct Duration Duration;
 typedef struct EnumDescriptor EnumDescriptor;
+typedef struct Enum Enum;
+typedef struct EnumValueDescriptor EnumValueDescriptor;
+typedef struct EnumValue EnumValue;
+typedef struct Field_Cardinality Field_Cardinality;
 typedef struct FieldDescriptor FieldDescriptor;
+typedef struct Field Field;
+typedef struct Field_Kind Field_Kind;
+typedef struct FieldMask FieldMask;
+typedef struct FloatValue FloatValue;
+typedef struct GPBEmpty GPBEmpty;
+typedef struct Int32Value Int32Value;
+typedef struct Int64Value Int64Value;
+typedef struct InternalDescriptorPool InternalDescriptorPool;
+typedef struct ListValue ListValue;
+typedef struct MapIter MapIter;
+typedef struct Map Map;
 typedef struct MessageField MessageField;
 typedef struct MessageHeader MessageHeader;
 typedef struct MessageLayout MessageLayout;
-typedef struct RepeatedField RepeatedField;
+typedef struct Method Method;
+typedef struct Mixin Mixin;
+typedef struct NullValue NullValue;
+typedef struct Oneof Oneof;
+typedef struct Option Option;
 typedef struct RepeatedFieldIter RepeatedFieldIter;
-typedef struct MapField MapField;
+typedef struct RepeatedField RepeatedField;
+typedef struct SourceContext SourceContext;
+typedef struct StringValue StringValue;
+typedef struct Struct Struct;
+typedef struct Syntax Syntax;
+typedef struct Timestamp Timestamp;
+typedef struct Type Type;
+typedef struct UInt32Value UInt32Value;
+typedef struct UInt64Value UInt64Value;
+typedef struct Value Value;
 
 // -----------------------------------------------------------------------------
 // Globals.
@@ -76,25 +660,76 @@ ZEND_BEGIN_MODULE_GLOBALS(protobuf)
 ZEND_END_MODULE_GLOBALS(protobuf)
 
 // Init module and PHP classes.
+void any_init(TSRMLS_D);
+void api_init(TSRMLS_D);
+void bool_value_init(TSRMLS_D);
+void bytes_value_init(TSRMLS_D);
 void descriptor_init(TSRMLS_D);
-void enum_descriptor_init(TSRMLS_D);
 void descriptor_pool_init(TSRMLS_D);
+void double_value_init(TSRMLS_D);
+void duration_init(TSRMLS_D);
+void empty_init(TSRMLS_D);
+void enum_descriptor_init(TSRMLS_D);
+void enum_init(TSRMLS_D);
+void enum_value_init(TSRMLS_D);
+void field_cardinality_init(TSRMLS_D);
+void field_descriptor_init(TSRMLS_D);
+void field_init(TSRMLS_D);
+void field_kind_init(TSRMLS_D);
+void field_mask_init(TSRMLS_D);
+void float_value_init(TSRMLS_D);
 void gpb_type_init(TSRMLS_D);
+void int32_value_init(TSRMLS_D);
+void int64_value_init(TSRMLS_D);
+void internal_descriptor_pool_init(TSRMLS_D);
+void list_value_init(TSRMLS_D);
 void map_field_init(TSRMLS_D);
+void map_field_iter_init(TSRMLS_D);
+void message_init(TSRMLS_D);
+void method_init(TSRMLS_D);
+void mixin_init(TSRMLS_D);
+void null_value_init(TSRMLS_D);
+void oneof_descriptor_init(TSRMLS_D);
+void option_init(TSRMLS_D);
 void repeated_field_init(TSRMLS_D);
 void repeated_field_iter_init(TSRMLS_D);
+void source_context_init(TSRMLS_D);
+void string_value_init(TSRMLS_D);
+void struct_init(TSRMLS_D);
+void syntax_init(TSRMLS_D);
+void timestamp_init(TSRMLS_D);
+void type_init(TSRMLS_D);
+void uint32_value_init(TSRMLS_D);
+void uint64_value_init(TSRMLS_D);
 void util_init(TSRMLS_D);
-void message_init(TSRMLS_D);
+void value_init(TSRMLS_D);
+
+void gpb_metadata_any_init(TSRMLS_D);
+void gpb_metadata_api_init(TSRMLS_D);
+void gpb_metadata_duration_init(TSRMLS_D);
+void gpb_metadata_field_mask_init(TSRMLS_D);
+void gpb_metadata_empty_init(TSRMLS_D);
+void gpb_metadata_source_context_init(TSRMLS_D);
+void gpb_metadata_struct_init(TSRMLS_D);
+void gpb_metadata_timestamp_init(TSRMLS_D);
+void gpb_metadata_type_init(TSRMLS_D);
+void gpb_metadata_wrappers_init(TSRMLS_D);
 
 // Global map from upb {msg,enum}defs to wrapper Descriptor/EnumDescriptor
 // instances.
-void add_def_obj(const void* def, zval* value);
-zval* get_def_obj(const void* def);
+void add_def_obj(const void* def, PHP_PROTO_HASHTABLE_VALUE value);
+PHP_PROTO_HASHTABLE_VALUE get_def_obj(const void* def);
 
 // Global map from PHP class entries to wrapper Descriptor/EnumDescriptor
 // instances.
-void add_ce_obj(const void* ce, zval* value);
-zval* get_ce_obj(const void* ce);
+void add_ce_obj(const void* ce, PHP_PROTO_HASHTABLE_VALUE value);
+PHP_PROTO_HASHTABLE_VALUE get_ce_obj(const void* ce);
+bool class_added(const void* ce);
+
+// Global map from message/enum's proto fully-qualified name to corresponding
+// wrapper Descriptor/EnumDescriptor instances.
+void add_proto_obj(const char* proto, PHP_PROTO_HASHTABLE_VALUE value);
+PHP_PROTO_HASHTABLE_VALUE get_proto_obj(const char* proto);
 
 extern zend_class_entry* map_field_type;
 extern zend_class_entry* repeated_field_type;
@@ -103,20 +738,41 @@ extern zend_class_entry* repeated_field_type;
 // Descriptor.
 // -----------------------------------------------------------------------------
 
-struct DescriptorPool {
-  zend_object std;
-  upb_symtab* symtab;
-  HashTable* pending_list;
-};
+PHP_PROTO_WRAP_OBJECT_START(DescriptorPool)
+  InternalDescriptorPool* intern;
+PHP_PROTO_WRAP_OBJECT_END
 
 PHP_METHOD(DescriptorPool, getGeneratedPool);
-PHP_METHOD(DescriptorPool, internalAddGeneratedFile);
+PHP_METHOD(DescriptorPool, getDescriptorByClassName);
+PHP_METHOD(DescriptorPool, getEnumDescriptorByClassName);
 
-extern zval* generated_pool_php;  // wrapper of generated pool
-extern DescriptorPool* generated_pool;  // The actual generated pool
-
-struct Descriptor {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(InternalDescriptorPool)
+  upb_symtab* symtab;
+  HashTable* pending_list;
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(InternalDescriptorPool, getGeneratedPool);
+PHP_METHOD(InternalDescriptorPool, internalAddGeneratedFile);
+
+void internal_add_generated_file(const char* data, PHP_PROTO_SIZE data_len,
+                                 InternalDescriptorPool* pool TSRMLS_DC);
+void init_generated_pool_once(TSRMLS_D);
+
+// wrapper of generated pool
+#if PHP_MAJOR_VERSION < 7
+extern zval* generated_pool_php;
+extern zval* internal_generated_pool_php;
+void descriptor_pool_free(void* object TSRMLS_DC);
+void internal_descriptor_pool_free(void* object TSRMLS_DC);
+#else
+extern zend_object *generated_pool_php;
+extern zend_object *internal_generated_pool_php;
+void descriptor_pool_free(zend_object* object);
+void internal_descriptor_pool_free(zend_object* object);
+#endif
+extern InternalDescriptorPool* generated_pool;  // The actual generated pool
+
+PHP_PROTO_WRAP_OBJECT_START(Descriptor)
   const upb_msgdef* msgdef;
   MessageLayout* layout;
   zend_class_entry* klass;  // begins as NULL
@@ -126,38 +782,68 @@ struct Descriptor {
   const upb_handlers* pb_serialize_handlers;
   const upb_handlers* json_serialize_handlers;
   const upb_handlers* json_serialize_handlers_preserve;
-};
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(Descriptor, getClass);
+PHP_METHOD(Descriptor, getFullName);
+PHP_METHOD(Descriptor, getField);
+PHP_METHOD(Descriptor, getFieldCount);
+PHP_METHOD(Descriptor, getOneofDecl);
+PHP_METHOD(Descriptor, getOneofDeclCount);
 
 extern zend_class_entry* descriptor_type;
 
 void descriptor_name_set(Descriptor *desc, const char *name);
 
-struct FieldDescriptor {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(FieldDescriptor)
   const upb_fielddef* fielddef;
-};
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(FieldDescriptor, getName);
+PHP_METHOD(FieldDescriptor, getNumber);
+PHP_METHOD(FieldDescriptor, getLabel);
+PHP_METHOD(FieldDescriptor, getType);
+PHP_METHOD(FieldDescriptor, isMap);
+PHP_METHOD(FieldDescriptor, getEnumType);
+PHP_METHOD(FieldDescriptor, getMessageType);
 
-struct EnumDescriptor {
-  zend_object std;
+extern zend_class_entry* field_descriptor_type;
+
+PHP_PROTO_WRAP_OBJECT_START(EnumDescriptor)
   const upb_enumdef* enumdef;
   zend_class_entry* klass;  // begins as NULL
-  // VALUE module;  // begins as nil
-};
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(EnumDescriptor, getValue);
+PHP_METHOD(EnumDescriptor, getValueCount);
 
 extern zend_class_entry* enum_descriptor_type;
 
+PHP_PROTO_WRAP_OBJECT_START(EnumValueDescriptor)
+  const char* name;
+  int32_t number;
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(EnumValueDescriptor, getName);
+PHP_METHOD(EnumValueDescriptor, getNumber);
+
+extern zend_class_entry* enum_value_descriptor_type;
+
 // -----------------------------------------------------------------------------
 // Message class creation.
 // -----------------------------------------------------------------------------
 
-void* message_data(void* msg);
-void message_create_with_type(zend_class_entry* ce, zval** message TSRMLS_DC);
+void* message_data(MessageHeader* msg);
+void custom_data_init(const zend_class_entry* ce,
+                      MessageHeader* msg PHP_PROTO_TSRMLS_DC);
 
 // Build PHP class for given descriptor. Instead of building from scratch, this
 // function modifies existing class which has been partially defined in PHP
 // code.
-void build_class_from_descriptor(zval* php_descriptor TSRMLS_DC);
+void build_class_from_descriptor(
+    PHP_PROTO_HASHTABLE_VALUE php_descriptor TSRMLS_DC);
 
+extern zend_class_entry* message_type;
 extern zend_object_handlers* message_handlers;
 
 // -----------------------------------------------------------------------------
@@ -227,18 +913,17 @@ struct MessageLayout {
   size_t size;
 };
 
-struct MessageHeader {
-  zend_object std;  // Stores properties table and class info of PHP instance.
-                    // This is needed for MessageHeader to be accessed via PHP.
+PHP_PROTO_WRAP_OBJECT_START(MessageHeader)
+  void* data;  // Point to the real message data.
+               // Place needs to be consistent with map_parse_frame_data_t.
   Descriptor* descriptor;  // Kept alive by self.class.descriptor reference.
-  // The real message data is appended after MessageHeader.
-};
+PHP_PROTO_WRAP_OBJECT_END
 
 MessageLayout* create_layout(const upb_msgdef* msgdef);
 void layout_init(MessageLayout* layout, void* storage,
-                 zval** properties_table TSRMLS_DC);
+                 zend_object* object PHP_PROTO_TSRMLS_DC);
 zval* layout_get(MessageLayout* layout, const void* storage,
-                 const upb_fielddef* field, zval** cache TSRMLS_DC);
+                 const upb_fielddef* field, CACHED_VALUE* cache TSRMLS_DC);
 void layout_set(MessageLayout* layout, MessageHeader* header,
                 const upb_fielddef* field, zval* val TSRMLS_DC);
 void layout_merge(MessageLayout* layout, MessageHeader* from,
@@ -246,6 +931,8 @@ void layout_merge(MessageLayout* layout, MessageHeader* from,
 const char* layout_get_oneof_case(MessageLayout* layout, const void* storage,
                                   const upb_oneofdef* oneof TSRMLS_DC);
 void free_layout(MessageLayout* layout);
+void* slot_memory(MessageLayout* layout, const void* storage,
+                  const upb_fielddef* field);
 
 PHP_METHOD(Message, clear);
 PHP_METHOD(Message, mergeFrom);
@@ -266,11 +953,15 @@ PHP_METHOD(Message, __construct);
 // This is called from the message class creation code.
 const upb_pbdecodermethod *new_fillmsg_decodermethod(Descriptor *desc,
                                                      const void *owner);
+void serialize_to_string(zval* val, zval* return_value TSRMLS_DC);
+void merge_from_string(const char* data, int data_len, const Descriptor* desc,
+                       MessageHeader* msg);
 
 PHP_METHOD(Message, serializeToString);
 PHP_METHOD(Message, mergeFromString);
-PHP_METHOD(Message, jsonEncode);
-PHP_METHOD(Message, jsonDecode);
+PHP_METHOD(Message, serializeToJsonString);
+PHP_METHOD(Message, mergeFromJsonString);
+PHP_METHOD(Message, discardUnknownFields);
 
 // -----------------------------------------------------------------------------
 // Type check / conversion.
@@ -285,6 +976,11 @@ bool protobuf_convert_to_double(zval* from, double* to);
 bool protobuf_convert_to_bool(zval* from, int8_t* to);
 bool protobuf_convert_to_string(zval* from);
 
+void check_repeated_field(const zend_class_entry* klass, PHP_PROTO_LONG type,
+                          zval* val, zval* return_value);
+void check_map_field(const zend_class_entry* klass, PHP_PROTO_LONG key_type,
+                     PHP_PROTO_LONG value_type, zval* val, zval* return_value);
+
 PHP_METHOD(Util, checkInt32);
 PHP_METHOD(Util, checkUint32);
 PHP_METHOD(Util, checkInt64);
@@ -296,6 +992,7 @@ PHP_METHOD(Util, checkBool);
 PHP_METHOD(Util, checkString);
 PHP_METHOD(Util, checkBytes);
 PHP_METHOD(Util, checkMessage);
+PHP_METHOD(Util, checkMapField);
 PHP_METHOD(Util, checkRepeatedField);
 
 // -----------------------------------------------------------------------------
@@ -307,7 +1004,14 @@ PHP_METHOD(Util, checkRepeatedField);
 size_t native_slot_size(upb_fieldtype_t type);
 bool native_slot_set(upb_fieldtype_t type, const zend_class_entry* klass,
                      void* memory, zval* value TSRMLS_DC);
-void native_slot_init(upb_fieldtype_t type, void* memory, zval** cache);
+// String/Message is stored differently in array/map from normal message fields.
+// So we need to make a special method to handle that.
+bool native_slot_set_by_array(upb_fieldtype_t type,
+                              const zend_class_entry* klass, void* memory,
+                              zval* value TSRMLS_DC);
+bool native_slot_set_by_map(upb_fieldtype_t type, const zend_class_entry* klass,
+                            void* memory, zval* value TSRMLS_DC);
+void native_slot_init(upb_fieldtype_t type, void* memory, CACHED_VALUE* cache);
 // For each property, in order to avoid conversion between the zval object and
 // the actual data type during parsing/serialization, the containing message
 // object use the custom memory layout to store the actual data type for each
@@ -316,27 +1020,36 @@ void native_slot_init(upb_fieldtype_t type, void* memory, zval** cache);
 // for providing such a zval object. Instead the caller needs to provide one
 // (cache) and update it with the actual data (memory).
 void native_slot_get(upb_fieldtype_t type, const void* memory,
-                     zval** cache TSRMLS_DC);
-void native_slot_get_default(upb_fieldtype_t type, zval** cache TSRMLS_DC);
+                     CACHED_VALUE* cache TSRMLS_DC);
+// String/Message is stored differently in array/map from normal message fields.
+// So we need to make a special method to handle that.
+void native_slot_get_by_array(upb_fieldtype_t type, const void* memory,
+                     CACHED_VALUE* cache TSRMLS_DC);
+void native_slot_get_by_map_key(upb_fieldtype_t type, const void* memory,
+                                int length, CACHED_VALUE* cache TSRMLS_DC);
+void native_slot_get_by_map_value(upb_fieldtype_t type, const void* memory,
+                                  CACHED_VALUE* cache TSRMLS_DC);
+void native_slot_get_default(upb_fieldtype_t type,
+                             CACHED_VALUE* cache TSRMLS_DC);
 
 // -----------------------------------------------------------------------------
 // Map Field.
 // -----------------------------------------------------------------------------
 
 extern zend_object_handlers* map_field_handlers;
+extern zend_object_handlers* map_field_iter_handlers;
 
-typedef struct {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(Map)
   upb_fieldtype_t key_type;
   upb_fieldtype_t value_type;
   const zend_class_entry* msg_ce;  // class entry for value message
   upb_strtable table;
-} Map;
+PHP_PROTO_WRAP_OBJECT_END
 
-typedef struct {
+PHP_PROTO_WRAP_OBJECT_START(MapIter)
   Map* self;
   upb_strtable_iter it;
-} MapIter;
+PHP_PROTO_WRAP_OBJECT_END
 
 void map_begin(zval* self, MapIter* iter TSRMLS_DC);
 void map_next(MapIter* iter);
@@ -348,10 +1061,14 @@ upb_value map_iter_value(MapIter* iter, int* len);
 const upb_fielddef* map_entry_key(const upb_msgdef* msgdef);
 const upb_fielddef* map_entry_value(const upb_msgdef* msgdef);
 
-zend_object_value map_field_create(zend_class_entry *ce TSRMLS_DC);
-void map_field_create_with_type(zend_class_entry *ce, const upb_fielddef *field,
-                                zval **map_field TSRMLS_DC);
-void map_field_free(void* object TSRMLS_DC);
+void map_field_create_with_field(const zend_class_entry* ce,
+                                 const upb_fielddef* field,
+                                 CACHED_VALUE* map_field PHP_PROTO_TSRMLS_DC);
+void map_field_create_with_type(const zend_class_entry* ce,
+                                upb_fieldtype_t key_type,
+                                upb_fieldtype_t value_type,
+                                const zend_class_entry* msg_ce,
+                                CACHED_VALUE* map_field PHP_PROTO_TSRMLS_DC);
 void* upb_value_memory(upb_value* v);
 
 #define MAP_KEY_FIELD 1
@@ -371,36 +1088,49 @@ PHP_METHOD(MapField, offsetGet);
 PHP_METHOD(MapField, offsetSet);
 PHP_METHOD(MapField, offsetUnset);
 PHP_METHOD(MapField, count);
+PHP_METHOD(MapField, getIterator);
+
+PHP_METHOD(MapFieldIter, rewind);
+PHP_METHOD(MapFieldIter, current);
+PHP_METHOD(MapFieldIter, key);
+PHP_METHOD(MapFieldIter, next);
+PHP_METHOD(MapFieldIter, valid);
 
 // -----------------------------------------------------------------------------
 // Repeated Field.
 // -----------------------------------------------------------------------------
 
 extern zend_object_handlers* repeated_field_handlers;
+extern zend_object_handlers* repeated_field_iter_handlers;
 
-struct RepeatedField {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(RepeatedField)
+#if PHP_MAJOR_VERSION < 7
   zval* array;
+#else
+  zval array;
+#endif
   upb_fieldtype_t type;
   const zend_class_entry* msg_ce;  // class entry for containing message
                                    // (for message field only).
-};
+PHP_PROTO_WRAP_OBJECT_END
 
-struct RepeatedFieldIter {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(RepeatedFieldIter)
   RepeatedField* repeated_field;
   long position;
-};
-
-void repeated_field_create_with_type(zend_class_entry* ce,
-                                     const upb_fielddef* field,
-                                     zval** repeated_field TSRMLS_DC);
+PHP_PROTO_WRAP_OBJECT_END
+
+void repeated_field_create_with_field(
+    zend_class_entry* ce, const upb_fielddef* field,
+    CACHED_VALUE* repeated_field PHP_PROTO_TSRMLS_DC);
+void repeated_field_create_with_type(
+    zend_class_entry* ce, upb_fieldtype_t type, const zend_class_entry* msg_ce,
+    CACHED_VALUE* repeated_field PHP_PROTO_TSRMLS_DC);
 // Return the element at the index position from the repeated field. There is
 // not restriction on the type of stored elements.
 void *repeated_field_index_native(RepeatedField *intern, int index TSRMLS_DC);
 // Add the element to the end of the repeated field. There is not restriction on
 // the type of stored elements.
-void repeated_field_push_native(RepeatedField *intern, void *value TSRMLS_DC);
+void repeated_field_push_native(RepeatedField *intern, void *value);
 
 PHP_METHOD(RepeatedField, __construct);
 PHP_METHOD(RepeatedField, append);
@@ -421,12 +1151,17 @@ PHP_METHOD(RepeatedFieldIter, valid);
 // Oneof Field.
 // -----------------------------------------------------------------------------
 
-typedef struct {
-  zend_object std;
+PHP_PROTO_WRAP_OBJECT_START(Oneof)
   upb_oneofdef* oneofdef;
   int index;    // Index of field in oneof. -1 if not set.
   char value[NATIVE_SLOT_MAX_SIZE];
-} Oneof;
+PHP_PROTO_WRAP_OBJECT_END
+
+PHP_METHOD(Oneof, getName);
+PHP_METHOD(Oneof, getField);
+PHP_METHOD(Oneof, getFieldCount);
+
+extern zend_class_entry* oneof_descriptor_type;
 
 // Oneof case slot value to indicate that no oneof case is set. The value `0` is
 // safe because field numbers are used as case identifiers, and no field can
@@ -434,28 +1169,266 @@ typedef struct {
 #define ONEOF_CASE_NONE 0
 
 // -----------------------------------------------------------------------------
+// Well Known Type.
+// -----------------------------------------------------------------------------
+
+extern bool is_inited_file_any;
+extern bool is_inited_file_api;
+extern bool is_inited_file_duration;
+extern bool is_inited_file_field_mask;
+extern bool is_inited_file_empty;
+extern bool is_inited_file_source_context;
+extern bool is_inited_file_struct;
+extern bool is_inited_file_timestamp;
+extern bool is_inited_file_type;
+extern bool is_inited_file_wrappers;
+
+PHP_METHOD(GPBMetadata_Any, initOnce);
+PHP_METHOD(GPBMetadata_Api, initOnce);
+PHP_METHOD(GPBMetadata_Duration, initOnce);
+PHP_METHOD(GPBMetadata_FieldMask, initOnce);
+PHP_METHOD(GPBMetadata_Empty, initOnce);
+PHP_METHOD(GPBMetadata_SourceContext, initOnce);
+PHP_METHOD(GPBMetadata_Struct, initOnce);
+PHP_METHOD(GPBMetadata_Timestamp, initOnce);
+PHP_METHOD(GPBMetadata_Type, initOnce);
+PHP_METHOD(GPBMetadata_Wrappers, initOnce);
+
+PHP_METHOD(Any, __construct);
+PHP_METHOD(Any, getTypeUrl);
+PHP_METHOD(Any, setTypeUrl);
+PHP_METHOD(Any, getValue);
+PHP_METHOD(Any, setValue);
+PHP_METHOD(Any, unpack);
+PHP_METHOD(Any, pack);
+PHP_METHOD(Any, is);
+
+PHP_METHOD(Duration, __construct);
+PHP_METHOD(Duration, getSeconds);
+PHP_METHOD(Duration, setSeconds);
+PHP_METHOD(Duration, getNanos);
+PHP_METHOD(Duration, setNanos);
+
+PHP_METHOD(Timestamp, __construct);
+PHP_METHOD(Timestamp, fromDateTime);
+PHP_METHOD(Timestamp, toDateTime);
+PHP_METHOD(Timestamp, getSeconds);
+PHP_METHOD(Timestamp, setSeconds);
+PHP_METHOD(Timestamp, getNanos);
+PHP_METHOD(Timestamp, setNanos);
+
+PHP_METHOD(Api, __construct);
+PHP_METHOD(Api, getName);
+PHP_METHOD(Api, setName);
+PHP_METHOD(Api, getMethods);
+PHP_METHOD(Api, setMethods);
+PHP_METHOD(Api, getOptions);
+PHP_METHOD(Api, setOptions);
+PHP_METHOD(Api, getVersion);
+PHP_METHOD(Api, setVersion);
+PHP_METHOD(Api, getSourceContext);
+PHP_METHOD(Api, setSourceContext);
+PHP_METHOD(Api, getMixins);
+PHP_METHOD(Api, setMixins);
+PHP_METHOD(Api, getSyntax);
+PHP_METHOD(Api, setSyntax);
+
+PHP_METHOD(BoolValue, __construct);
+PHP_METHOD(BoolValue, getValue);
+PHP_METHOD(BoolValue, setValue);
+
+PHP_METHOD(BytesValue, __construct);
+PHP_METHOD(BytesValue, getValue);
+PHP_METHOD(BytesValue, setValue);
+
+PHP_METHOD(DoubleValue, __construct);
+PHP_METHOD(DoubleValue, getValue);
+PHP_METHOD(DoubleValue, setValue);
+
+PHP_METHOD(Enum, __construct);
+PHP_METHOD(Enum, getName);
+PHP_METHOD(Enum, setName);
+PHP_METHOD(Enum, getEnumvalue);
+PHP_METHOD(Enum, setEnumvalue);
+PHP_METHOD(Enum, getOptions);
+PHP_METHOD(Enum, setOptions);
+PHP_METHOD(Enum, getSourceContext);
+PHP_METHOD(Enum, setSourceContext);
+PHP_METHOD(Enum, getSyntax);
+PHP_METHOD(Enum, setSyntax);
+
+PHP_METHOD(EnumValue, __construct);
+PHP_METHOD(EnumValue, getName);
+PHP_METHOD(EnumValue, setName);
+PHP_METHOD(EnumValue, getNumber);
+PHP_METHOD(EnumValue, setNumber);
+PHP_METHOD(EnumValue, getOptions);
+PHP_METHOD(EnumValue, setOptions);
+
+PHP_METHOD(FieldMask, __construct);
+PHP_METHOD(FieldMask, getPaths);
+PHP_METHOD(FieldMask, setPaths);
+
+PHP_METHOD(Field, __construct);
+PHP_METHOD(Field, getKind);
+PHP_METHOD(Field, setKind);
+PHP_METHOD(Field, getCardinality);
+PHP_METHOD(Field, setCardinality);
+PHP_METHOD(Field, getNumber);
+PHP_METHOD(Field, setNumber);
+PHP_METHOD(Field, getName);
+PHP_METHOD(Field, setName);
+PHP_METHOD(Field, getTypeUrl);
+PHP_METHOD(Field, setTypeUrl);
+PHP_METHOD(Field, getOneofIndex);
+PHP_METHOD(Field, setOneofIndex);
+PHP_METHOD(Field, getPacked);
+PHP_METHOD(Field, setPacked);
+PHP_METHOD(Field, getOptions);
+PHP_METHOD(Field, setOptions);
+PHP_METHOD(Field, getJsonName);
+PHP_METHOD(Field, setJsonName);
+PHP_METHOD(Field, getDefaultValue);
+PHP_METHOD(Field, setDefaultValue);
+
+PHP_METHOD(FloatValue, __construct);
+PHP_METHOD(FloatValue, getValue);
+PHP_METHOD(FloatValue, setValue);
+
+PHP_METHOD(GPBEmpty, __construct);
+
+PHP_METHOD(Int32Value, __construct);
+PHP_METHOD(Int32Value, getValue);
+PHP_METHOD(Int32Value, setValue);
+
+PHP_METHOD(Int64Value, __construct);
+PHP_METHOD(Int64Value, getValue);
+PHP_METHOD(Int64Value, setValue);
+
+PHP_METHOD(ListValue, __construct);
+PHP_METHOD(ListValue, getValues);
+PHP_METHOD(ListValue, setValues);
+
+PHP_METHOD(Method, __construct);
+PHP_METHOD(Method, getName);
+PHP_METHOD(Method, setName);
+PHP_METHOD(Method, getRequestTypeUrl);
+PHP_METHOD(Method, setRequestTypeUrl);
+PHP_METHOD(Method, getRequestStreaming);
+PHP_METHOD(Method, setRequestStreaming);
+PHP_METHOD(Method, getResponseTypeUrl);
+PHP_METHOD(Method, setResponseTypeUrl);
+PHP_METHOD(Method, getResponseStreaming);
+PHP_METHOD(Method, setResponseStreaming);
+PHP_METHOD(Method, getOptions);
+PHP_METHOD(Method, setOptions);
+PHP_METHOD(Method, getSyntax);
+PHP_METHOD(Method, setSyntax);
+
+PHP_METHOD(Mixin, __construct);
+PHP_METHOD(Mixin, getName);
+PHP_METHOD(Mixin, setName);
+PHP_METHOD(Mixin, getRoot);
+PHP_METHOD(Mixin, setRoot);
+
+PHP_METHOD(Option, __construct);
+PHP_METHOD(Option, getName);
+PHP_METHOD(Option, setName);
+PHP_METHOD(Option, getValue);
+PHP_METHOD(Option, setValue);
+
+PHP_METHOD(SourceContext, __construct);
+PHP_METHOD(SourceContext, getFileName);
+PHP_METHOD(SourceContext, setFileName);
+
+PHP_METHOD(StringValue, __construct);
+PHP_METHOD(StringValue, getValue);
+PHP_METHOD(StringValue, setValue);
+
+PHP_METHOD(Struct, __construct);
+PHP_METHOD(Struct, getFields);
+PHP_METHOD(Struct, setFields);
+
+PHP_METHOD(Type, __construct);
+PHP_METHOD(Type, getName);
+PHP_METHOD(Type, setName);
+PHP_METHOD(Type, getFields);
+PHP_METHOD(Type, setFields);
+PHP_METHOD(Type, getOneofs);
+PHP_METHOD(Type, setOneofs);
+PHP_METHOD(Type, getOptions);
+PHP_METHOD(Type, setOptions);
+PHP_METHOD(Type, getSourceContext);
+PHP_METHOD(Type, setSourceContext);
+PHP_METHOD(Type, getSyntax);
+PHP_METHOD(Type, setSyntax);
+
+PHP_METHOD(UInt32Value, __construct);
+PHP_METHOD(UInt32Value, getValue);
+PHP_METHOD(UInt32Value, setValue);
+
+PHP_METHOD(UInt64Value, __construct);
+PHP_METHOD(UInt64Value, getValue);
+PHP_METHOD(UInt64Value, setValue);
+
+PHP_METHOD(Value, __construct);
+PHP_METHOD(Value, getNullValue);
+PHP_METHOD(Value, setNullValue);
+PHP_METHOD(Value, getNumberValue);
+PHP_METHOD(Value, setNumberValue);
+PHP_METHOD(Value, getStringValue);
+PHP_METHOD(Value, setStringValue);
+PHP_METHOD(Value, getBoolValue);
+PHP_METHOD(Value, setBoolValue);
+PHP_METHOD(Value, getStructValue);
+PHP_METHOD(Value, setStructValue);
+PHP_METHOD(Value, getListValue);
+PHP_METHOD(Value, setListValue);
+PHP_METHOD(Value, getKind);
+
+extern zend_class_entry* any_type;
+extern zend_class_entry* api_type;
+extern zend_class_entry* bool_value_type;
+extern zend_class_entry* bytes_value_type;
+extern zend_class_entry* double_value_type;
+extern zend_class_entry* duration_type;
+extern zend_class_entry* empty_type;
+extern zend_class_entry* enum_type;
+extern zend_class_entry* enum_value_type;
+extern zend_class_entry* field_cardinality_type;
+extern zend_class_entry* field_kind_type;
+extern zend_class_entry* field_mask_type;
+extern zend_class_entry* field_type;
+extern zend_class_entry* float_value_type;
+extern zend_class_entry* int32_value_type;
+extern zend_class_entry* int64_value_type;
+extern zend_class_entry* list_value_type;
+extern zend_class_entry* method_type;
+extern zend_class_entry* mixin_type;
+extern zend_class_entry* null_value_type;
+extern zend_class_entry* option_type;
+extern zend_class_entry* source_context_type;
+extern zend_class_entry* string_value_type;
+extern zend_class_entry* struct_type;
+extern zend_class_entry* syntax_type;
+extern zend_class_entry* timestamp_type;
+extern zend_class_entry* type_type;
+extern zend_class_entry* uint32_value_type;
+extern zend_class_entry* uint64_value_type;
+extern zend_class_entry* value_type;
+
+// -----------------------------------------------------------------------------
 // Upb.
 // -----------------------------------------------------------------------------
 
 upb_fieldtype_t to_fieldtype(upb_descriptortype_t type);
-const zend_class_entry *field_type_class(const upb_fielddef *field TSRMLS_DC);
+const zend_class_entry* field_type_class(
+    const upb_fielddef* field PHP_PROTO_TSRMLS_DC);
 
 // -----------------------------------------------------------------------------
 // Utilities.
 // -----------------------------------------------------------------------------
 
-// PHP <-> C conversion.
-#define UNBOX(class_name, val) \
-  (class_name*)zend_object_store_get_object(val TSRMLS_CC);
-
-#define BOX(class_name, wrapper, intern, free_func)                    \
-  MAKE_STD_ZVAL(wrapper);                                              \
-  Z_TYPE_P(wrapper) = IS_OBJECT;                                       \
-  Z_OBJVAL_P(wrapper)                                                  \
-      .handle =                                                        \
-      zend_objects_store_put(intern, NULL, free_func, NULL TSRMLS_CC); \
-  Z_OBJVAL_P(wrapper).handlers = zend_get_std_object_handlers();
-
 // Memory management
 #define ALLOC(class_name) (class_name*) emalloc(sizeof(class_name))
 #define PEMALLOC(class_name) (class_name*) pemalloc(sizeof(class_name), 1)
@@ -463,19 +1436,31 @@ const zend_class_entry *field_type_class(const upb_fielddef *field TSRMLS_DC);
 #define FREE(object) efree(object)
 #define PEFREE(object) pefree(object, 1)
 
-// Create PHP internal instance.
-#define CREATE(class_name, intern, init_func) \
-  intern = ALLOC(class_name);                 \
-  memset(intern, 0, sizeof(class_name));      \
-  init_func(intern TSRMLS_CC);
-
 // String argument.
 #define STR(str) (str), strlen(str)
 
 // Zend Value
+#if PHP_MAJOR_VERSION < 7
 #define Z_OBJ_P(zval_p)                                       \
   ((zend_object*)(EG(objects_store)                           \
                       .object_buckets[Z_OBJ_HANDLE_P(zval_p)] \
                       .bucket.obj.object))
+#endif
+
+// Message handler
+static inline zval* php_proto_message_read_property(
+    zval* msg, zval* member PHP_PROTO_TSRMLS_DC) {
+#if PHP_MAJOR_VERSION < 7
+  return message_handlers->read_property(msg, member, BP_VAR_R,
+                                         NULL PHP_PROTO_TSRMLS_CC);
+#else
+  return message_handlers->read_property(msg, member, BP_VAR_R, NULL,
+                                         NULL PHP_PROTO_TSRMLS_CC);
+#endif
+}
+
+// Reserved name
+bool is_reserved_name(const char* name);
+bool is_valid_constant_name(const char* name);
 
 #endif  // __GOOGLE_PROTOBUF_PHP_PROTOBUF_H__
diff --git a/php/ext/google/protobuf/storage.c b/php/ext/google/protobuf/storage.c
index 1b239ee3..e7910c85 100644
--- a/php/ext/google/protobuf/storage.c
+++ b/php/ext/google/protobuf/storage.c
@@ -57,7 +57,7 @@ size_t native_slot_size(upb_fieldtype_t type) {
   }
 }
 
-static bool native_slot_is_default(upb_fieldtype_t type, void* memory) {
+static bool native_slot_is_default(upb_fieldtype_t type, const void* memory) {
   switch (type) {
 #define CASE_TYPE(upb_type, c_type)    \
   case UPB_TYPE_##upb_type: {          \
@@ -75,15 +75,17 @@ static bool native_slot_is_default(upb_fieldtype_t type, void* memory) {
 #undef CASE_TYPE
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
-      return Z_STRLEN_PP(DEREF(memory, zval**)) == 0;
+      return Z_STRLEN_P(CACHED_PTR_TO_ZVAL_PTR(DEREF(memory, CACHED_VALUE*))) ==
+             0;
     case UPB_TYPE_MESSAGE:
-      return Z_TYPE_PP(DEREF(memory, zval**)) == IS_NULL;
+      return Z_TYPE_P(CACHED_PTR_TO_ZVAL_PTR(DEREF(memory, CACHED_VALUE*))) ==
+             IS_NULL;
     default: return false;
   }
 }
 
 bool native_slot_set(upb_fieldtype_t type, const zend_class_entry* klass,
-                     void* memory, zval* value TSRMLS_DC) {
+                     void* memory, zval* value PHP_PROTO_TSRMLS_DC) {
   switch (type) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
@@ -95,14 +97,14 @@ bool native_slot_set(upb_fieldtype_t type, const zend_class_entry* klass,
         zend_error(E_USER_ERROR, "Given string is not UTF8 encoded.");
         return false;
       }
-      if (*(zval**)memory != NULL) {
+
+      zval* cached_zval = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (EXPECTED(cached_zval != NULL)) {
+#if PHP_MAJOR_VERSION < 7
         REPLACE_ZVAL_VALUE((zval**)memory, value, 1);
-      } else {
-        // Handles repeated/map string field. Memory provided by
-        // RepeatedField/Map is not initialized.
-        MAKE_STD_ZVAL(DEREF(memory, zval*));
-        ZVAL_STRINGL(DEREF(memory, zval*), Z_STRVAL_P(value), Z_STRLEN_P(value),
-                     1);
+#else
+        zend_assign_to_variable(cached_zval, value, IS_CV);
+#endif
       }
       break;
     }
@@ -115,13 +117,18 @@ bool native_slot_set(upb_fieldtype_t type, const zend_class_entry* klass,
         zend_error(E_USER_ERROR, "Given message does not have correct class.");
         return false;
       }
-      if (EXPECTED(DEREF(memory, zval*) != value)) {
-        if (DEREF(memory, zval*) != NULL) {
-          zval_ptr_dtor((zval**)memory);
-        }
-        DEREF(memory, zval*) = value;
-        Z_ADDREF_P(value);
+
+      zval* property_ptr = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (EXPECTED(property_ptr != value)) {
+        php_proto_zval_ptr_dtor(property_ptr);
       }
+
+#if PHP_MAJOR_VERSION < 7
+      DEREF(memory, zval*) = value;
+      Z_ADDREF_P(value);
+#else
+      ZVAL_ZVAL(property_ptr, value, 1, 0);
+#endif
       break;
     }
 
@@ -151,7 +158,110 @@ bool native_slot_set(upb_fieldtype_t type, const zend_class_entry* klass,
   return true;
 }
 
-void native_slot_init(upb_fieldtype_t type, void* memory, zval** cache) {
+bool native_slot_set_by_array(upb_fieldtype_t type,
+                              const zend_class_entry* klass, void* memory,
+                              zval* value TSRMLS_DC) {
+  switch (type) {
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES: {
+      if (!protobuf_convert_to_string(value)) {
+        return false;
+      }
+      if (type == UPB_TYPE_STRING &&
+          !is_structurally_valid_utf8(Z_STRVAL_P(value), Z_STRLEN_P(value))) {
+        zend_error(E_USER_ERROR, "Given string is not UTF8 encoded.");
+        return false;
+      }
+
+      // Handles repeated/map string field. Memory provided by
+      // RepeatedField/Map is not initialized.
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(DEREF(memory, zval*));
+      PHP_PROTO_ZVAL_STRINGL(DEREF(memory, zval*), Z_STRVAL_P(value),
+                             Z_STRLEN_P(value), 1);
+#else
+      *(zend_string**)memory = zend_string_dup(Z_STR_P(value), 0);
+#endif
+      break;
+    }
+    case UPB_TYPE_MESSAGE: {
+      if (Z_TYPE_P(value) != IS_OBJECT) {
+        zend_error(E_USER_ERROR, "Given value is not message.");
+        return false;
+      }
+      if (Z_TYPE_P(value) == IS_OBJECT && klass != Z_OBJCE_P(value)) {
+        zend_error(E_USER_ERROR, "Given message does not have correct class.");
+        return false;
+      }
+#if PHP_MAJOR_VERSION < 7
+      if (EXPECTED(DEREF(memory, zval*) != value)) {
+        DEREF(memory, zval*) = value;
+        Z_ADDREF_P(value);
+      }
+#else
+      DEREF(memory, zval*) = value;
+      ++GC_REFCOUNT(Z_OBJ_P(value));
+#endif
+      break;
+    }
+    default:
+      return native_slot_set(type, klass, memory, value TSRMLS_CC);
+  }
+  return true;
+}
+
+bool native_slot_set_by_map(upb_fieldtype_t type, const zend_class_entry* klass,
+                            void* memory, zval* value TSRMLS_DC) {
+  switch (type) {
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES: {
+      if (!protobuf_convert_to_string(value)) {
+        return false;
+      }
+      if (type == UPB_TYPE_STRING &&
+          !is_structurally_valid_utf8(Z_STRVAL_P(value), Z_STRLEN_P(value))) {
+        zend_error(E_USER_ERROR, "Given string is not UTF8 encoded.");
+        return false;
+      }
+
+      // Handles repeated/map string field. Memory provided by
+      // RepeatedField/Map is not initialized.
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(DEREF(memory, zval*));
+      PHP_PROTO_ZVAL_STRINGL(DEREF(memory, zval*), Z_STRVAL_P(value),
+                             Z_STRLEN_P(value), 1);
+#else
+      *(zend_string**)memory = zend_string_dup(Z_STR_P(value), 0);
+#endif
+      break;
+    }
+    case UPB_TYPE_MESSAGE: {
+      if (Z_TYPE_P(value) != IS_OBJECT) {
+        zend_error(E_USER_ERROR, "Given value is not message.");
+        return false;
+      }
+      if (Z_TYPE_P(value) == IS_OBJECT && klass != Z_OBJCE_P(value)) {
+        zend_error(E_USER_ERROR, "Given message does not have correct class.");
+        return false;
+      }
+#if PHP_MAJOR_VERSION < 7
+      if (EXPECTED(DEREF(memory, zval*) != value)) {
+        DEREF(memory, zval*) = value;
+        Z_ADDREF_P(value);
+      }
+#else
+      DEREF(memory, zend_object*) = Z_OBJ_P(value);
+      ++GC_REFCOUNT(Z_OBJ_P(value));
+#endif
+      break;
+    }
+    default:
+      return native_slot_set(type, klass, memory, value TSRMLS_CC);
+  }
+  return true;
+}
+
+void native_slot_init(upb_fieldtype_t type, void* memory, CACHED_VALUE* cache) {
   zval* tmp = NULL;
   switch (type) {
     case UPB_TYPE_FLOAT:
@@ -166,7 +276,7 @@ void native_slot_init(upb_fieldtype_t type, void* memory, zval** cache) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
     case UPB_TYPE_MESSAGE:
-      DEREF(memory, zval**) = cache;
+      DEREF(memory, CACHED_VALUE*) = cache;
       break;
     case UPB_TYPE_ENUM:
     case UPB_TYPE_INT32:
@@ -187,38 +297,38 @@ void native_slot_init(upb_fieldtype_t type, void* memory, zval** cache) {
 }
 
 void native_slot_get(upb_fieldtype_t type, const void* memory,
-                     zval** cache TSRMLS_DC) {
+                     CACHED_VALUE* cache TSRMLS_DC) {
   switch (type) {
-#define CASE(upb_type, php_type, c_type) \
-    case UPB_TYPE_##upb_type: \
-      SEPARATE_ZVAL_IF_NOT_REF(cache); \
-      ZVAL_##php_type(*cache, DEREF(memory, c_type)); \
-      return;
+#define CASE(upb_type, php_type, c_type)                                   \
+  case UPB_TYPE_##upb_type:                                                \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);                             \
+    ZVAL_##php_type(CACHED_PTR_TO_ZVAL_PTR(cache), DEREF(memory, c_type)); \
+    return;
 
-CASE(FLOAT,  DOUBLE, float)
-CASE(DOUBLE, DOUBLE, double)
-CASE(BOOL,   BOOL,   int8_t)
-CASE(INT32,  LONG,   int32_t)
-CASE(ENUM,   LONG,   uint32_t)
+    CASE(FLOAT, DOUBLE, float)
+    CASE(DOUBLE, DOUBLE, double)
+    CASE(BOOL, BOOL, int8_t)
+    CASE(INT32, LONG, int32_t)
+    CASE(ENUM, LONG, uint32_t)
 
 #undef CASE
 
 #if SIZEOF_LONG == 4
-#define CASE(upb_type, c_type)                        \
-    case UPB_TYPE_##upb_type: {                       \
-      SEPARATE_ZVAL_IF_NOT_REF(cache);                \
-      char buffer[MAX_LENGTH_OF_INT64];               \
-      sprintf(buffer, "%lld", DEREF(memory, c_type)); \
-      ZVAL_STRING(*cache, buffer, 1);                 \
-      return;                                         \
-    }
+#define CASE(upb_type, c_type)                                       \
+  case UPB_TYPE_##upb_type: {                                        \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);                       \
+    char buffer[MAX_LENGTH_OF_INT64];                                \
+    sprintf(buffer, "%lld", DEREF(memory, c_type));                  \
+    PHP_PROTO_ZVAL_STRING(CACHED_PTR_TO_ZVAL_PTR(cache), buffer, 1); \
+    return;                                                          \
+  }
 #else
-#define CASE(upb_type, c_type)                        \
-    case UPB_TYPE_##upb_type: {                       \
-      SEPARATE_ZVAL_IF_NOT_REF(cache);                \
-      ZVAL_LONG(*cache, DEREF(memory, c_type));       \
-      return;                                         \
-    }
+#define CASE(upb_type, c_type)                                       \
+  case UPB_TYPE_##upb_type: {                                        \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);                       \
+    ZVAL_LONG(CACHED_PTR_TO_ZVAL_PTR(cache), DEREF(memory, c_type)); \
+    return;                                                          \
+  }
 #endif
 CASE(UINT64, uint64_t)
 CASE(INT64,  int64_t)
@@ -227,32 +337,34 @@ CASE(INT64,  int64_t)
     case UPB_TYPE_UINT32: {
       // Prepend bit-1 for negative numbers, so that uint32 value will be
       // consistent on both 32-bit and 64-bit architectures.
-      SEPARATE_ZVAL_IF_NOT_REF(cache);
+      PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);
       int value = DEREF(memory, int32_t);
       if (sizeof(int) == 8) {
         value |= (-((value >> 31) & 0x1) & 0xFFFFFFFF00000000);
       }
-      ZVAL_LONG(*cache, value);
+      ZVAL_LONG(CACHED_PTR_TO_ZVAL_PTR(cache), value);
       return;
     }
 
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
-      // For optional string/bytes fields, the cache is owned by the containing
-      // message and should have been updated during setting/decoding. However,
-      // for repeated string/bytes fields, the cache is provided by zend engine
-      // and has not been updated.
-      zval* value = DEREF(memory, zval*);
-      if (*cache != value) {
-        ZVAL_STRINGL(*cache, Z_STRVAL_P(value), Z_STRLEN_P(value), 1);
+      // For optional string/bytes/message fields, the cache is owned by the
+      // containing message and should have been updated during
+      // setting/decoding. However, oneof accessor call this function by
+      // providing the return value directly, which is not the same as the cache
+      // value.
+      zval* value = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (CACHED_PTR_TO_ZVAL_PTR(cache) != value) {
+        PHP_PROTO_ZVAL_STRINGL(CACHED_PTR_TO_ZVAL_PTR(cache), Z_STRVAL_P(value),
+                               Z_STRLEN_P(value), 1);
       }
       break;
     }
     case UPB_TYPE_MESSAGE: {
       // Same as above for string/bytes fields.
-      zval* value = DEREF(memory, zval*);
-      if (*cache != value) {
-        ZVAL_ZVAL(*cache, value, 1, 0);
+      zval* value = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (CACHED_PTR_TO_ZVAL_PTR(cache) != value) {
+        ZVAL_ZVAL(CACHED_PTR_TO_ZVAL_PTR(cache), value, 1, 0);
       }
       return;
     }
@@ -261,12 +373,78 @@ CASE(INT64,  int64_t)
   }
 }
 
-void native_slot_get_default(upb_fieldtype_t type, zval** cache TSRMLS_DC) {
+void native_slot_get_by_array(upb_fieldtype_t type, const void* memory,
+                              CACHED_VALUE* cache TSRMLS_DC) {
   switch (type) {
-#define CASE(upb_type, php_type)     \
-  case UPB_TYPE_##upb_type:          \
-    SEPARATE_ZVAL_IF_NOT_REF(cache); \
-    ZVAL_##php_type(*cache, 0);      \
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
+      zval* value = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (EXPECTED(CACHED_PTR_TO_ZVAL_PTR(cache) != value)) {
+        PHP_PROTO_ZVAL_STRINGL(CACHED_PTR_TO_ZVAL_PTR(cache),
+                               Z_STRVAL_P(value), Z_STRLEN_P(value), 1);
+      }
+#else
+      ZVAL_NEW_STR(cache, zend_string_dup(*(zend_string**)memory, 0));
+#endif
+      return;
+    }
+    case UPB_TYPE_MESSAGE: {
+#if PHP_MAJOR_VERSION < 7
+      zval* value = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (EXPECTED(CACHED_PTR_TO_ZVAL_PTR(cache) != value)) {
+        ZVAL_ZVAL(CACHED_PTR_TO_ZVAL_PTR(cache), value, 1, 0);
+      }
+#else
+      ZVAL_COPY(CACHED_PTR_TO_ZVAL_PTR(cache), memory);
+#endif
+      return;
+    }
+    default:
+      native_slot_get(type, memory, cache TSRMLS_CC);
+  }
+}
+
+void native_slot_get_by_map_key(upb_fieldtype_t type, const void* memory,
+                                int length, CACHED_VALUE* cache TSRMLS_DC) {
+  switch (type) {
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES: {
+      PHP_PROTO_ZVAL_STRINGL(CACHED_PTR_TO_ZVAL_PTR(cache), memory, length, 1);
+      return;
+    }
+    default:
+      native_slot_get(type, memory, cache TSRMLS_CC);
+  }
+}
+
+void native_slot_get_by_map_value(upb_fieldtype_t type, const void* memory,
+                              CACHED_VALUE* cache TSRMLS_DC) {
+  switch (type) {
+    case UPB_TYPE_MESSAGE: {
+#if PHP_MAJOR_VERSION < 7
+      zval* value = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+      if (EXPECTED(CACHED_PTR_TO_ZVAL_PTR(cache) != value)) {
+        ZVAL_ZVAL(CACHED_PTR_TO_ZVAL_PTR(cache), value, 1, 0);
+      }
+#else
+      ++GC_REFCOUNT(*(zend_object**)memory);
+      ZVAL_OBJ(cache, *(zend_object**)memory);
+#endif
+      return;
+    }
+    default:
+      native_slot_get_by_array(type, memory, cache TSRMLS_CC);
+  }
+}
+
+void native_slot_get_default(upb_fieldtype_t type,
+                             CACHED_VALUE* cache TSRMLS_DC) {
+  switch (type) {
+#define CASE(upb_type, php_type)                       \
+  case UPB_TYPE_##upb_type:                            \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);         \
+    ZVAL_##php_type(CACHED_PTR_TO_ZVAL_PTR(cache), 0); \
     return;
 
     CASE(FLOAT, DOUBLE)
@@ -279,19 +457,19 @@ void native_slot_get_default(upb_fieldtype_t type, zval** cache TSRMLS_DC) {
 #undef CASE
 
 #if SIZEOF_LONG == 4
-#define CASE(upb_type)                                \
-    case UPB_TYPE_##upb_type: {                       \
-      SEPARATE_ZVAL_IF_NOT_REF(cache);                \
-      ZVAL_STRING(*cache, "0", 1);                    \
-      return;                                         \
-    }
+#define CASE(upb_type)                                            \
+  case UPB_TYPE_##upb_type: {                                     \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);                    \
+    PHP_PROTO_ZVAL_STRING(CACHED_PTR_TO_ZVAL_PTR(cache), "0", 1); \
+    return;                                                       \
+  }
 #else
-#define CASE(upb_type)                                \
-    case UPB_TYPE_##upb_type: {                       \
-      SEPARATE_ZVAL_IF_NOT_REF(cache);                \
-      ZVAL_LONG(*cache, 0);                           \
-      return;                                         \
-    }
+#define CASE(upb_type)                           \
+  case UPB_TYPE_##upb_type: {                    \
+    PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);   \
+    ZVAL_LONG(CACHED_PTR_TO_ZVAL_PTR(cache), 0); \
+    return;                                      \
+  }
 #endif
 CASE(UINT64)
 CASE(INT64)
@@ -299,13 +477,13 @@ CASE(INT64)
 
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES: {
-      SEPARATE_ZVAL_IF_NOT_REF(cache);
-      ZVAL_STRINGL(*cache, "", 0, 1);
+      PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);
+      PHP_PROTO_ZVAL_STRINGL(CACHED_PTR_TO_ZVAL_PTR(cache), "", 0, 1);
       break;
     }
     case UPB_TYPE_MESSAGE: {
-      SEPARATE_ZVAL_IF_NOT_REF(cache);
-      ZVAL_NULL(*cache);
+      PHP_PROTO_SEPARATE_ZVAL_IF_NOT_REF(cache);
+      ZVAL_NULL(CACHED_PTR_TO_ZVAL_PTR(cache));
       return;
     }
     default:
@@ -359,14 +537,15 @@ const upb_fielddef* map_entry_value(const upb_msgdef* msgdef) {
   return value_field;
 }
 
-const zend_class_entry* field_type_class(const upb_fielddef* field TSRMLS_DC) {
+const zend_class_entry* field_type_class(
+    const upb_fielddef* field PHP_PROTO_TSRMLS_DC) {
   if (upb_fielddef_type(field) == UPB_TYPE_MESSAGE) {
-    zval* desc_php = get_def_obj(upb_fielddef_subdef(field));
-    Descriptor* desc = zend_object_store_get_object(desc_php TSRMLS_CC);
+    Descriptor* desc = UNBOX_HASHTABLE_VALUE(
+        Descriptor, get_def_obj(upb_fielddef_subdef(field)));
     return desc->klass;
   } else if (upb_fielddef_type(field) == UPB_TYPE_ENUM) {
-    zval* desc_php = get_def_obj(upb_fielddef_subdef(field));
-    EnumDescriptor* desc = zend_object_store_get_object(desc_php TSRMLS_CC);
+    EnumDescriptor* desc = UNBOX_HASHTABLE_VALUE(
+        EnumDescriptor, get_def_obj(upb_fielddef_subdef(field)));
     return desc->klass;
   }
   return NULL;
@@ -381,11 +560,6 @@ static size_t align_up_to(size_t offset, size_t granularity) {
   return (offset + granularity - 1) & ~(granularity - 1);
 }
 
-static void* slot_memory(MessageLayout* layout, const void* storage,
-                         const upb_fielddef* field) {
-  return ((uint8_t*)storage) + layout->fields[upb_fielddef_index(field)].offset;
-}
-
 static uint32_t* slot_oneof_case(MessageLayout* layout, const void* storage,
                                  const upb_fielddef* field) {
   return (uint32_t*)(((uint8_t*)storage) +
@@ -397,6 +571,11 @@ static int slot_property_cache(MessageLayout* layout, const void* storage,
   return layout->fields[upb_fielddef_index(field)].cache_index;
 }
 
+void* slot_memory(MessageLayout* layout, const void* storage,
+                         const upb_fielddef* field) {
+  return ((uint8_t*)storage) + layout->fields[upb_fielddef_index(field)].offset;
+}
+
 MessageLayout* create_layout(const upb_msgdef* msgdef) {
   MessageLayout* layout = ALLOC(MessageLayout);
   int nfields = upb_msgdef_numfields(msgdef);
@@ -405,6 +584,11 @@ MessageLayout* create_layout(const upb_msgdef* msgdef) {
   size_t off = 0;
   int i = 0;
 
+  // Reserve space for unknown fields.
+  off += sizeof(void*);
+
+  TSRMLS_FETCH();
+  Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(msgdef));
   layout->fields = ALLOC_N(MessageField, nfields);
 
   for (upb_msg_field_begin(&it, msgdef); !upb_msg_field_done(&it);
@@ -430,7 +614,37 @@ MessageLayout* create_layout(const upb_msgdef* msgdef) {
     layout->fields[upb_fielddef_index(field)].offset = off;
     layout->fields[upb_fielddef_index(field)].case_offset =
         MESSAGE_FIELD_NO_CASE;
-    layout->fields[upb_fielddef_index(field)].cache_index = i++;
+
+    const char* fieldname = upb_fielddef_name(field);
+
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
+    zend_class_entry* old_scope = EG(scope);
+    EG(scope) = desc->klass;
+#else
+    zend_class_entry* old_scope = EG(fake_scope);
+    EG(fake_scope) = desc->klass;
+#endif
+
+#if PHP_MAJOR_VERSION < 7
+    zval member;
+    ZVAL_STRINGL(&member, fieldname, strlen(fieldname), 0);
+    zend_property_info* property_info =
+        zend_get_property_info(desc->klass, &member, true TSRMLS_CC);
+#else
+    zend_string* member = zend_string_init(fieldname, strlen(fieldname), 1);
+    zend_property_info* property_info =
+        zend_get_property_info(desc->klass, member, true);
+    zend_string_release(member);
+#endif
+
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
+    EG(scope) = old_scope;
+#else
+    EG(fake_scope) = old_scope;
+#endif
+
+    layout->fields[upb_fielddef_index(field)].cache_index =
+        property_info->offset;
     off += field_size;
   }
 
@@ -458,11 +672,40 @@ MessageLayout* create_layout(const upb_msgdef* msgdef) {
     // Align the offset .
     off = align_up_to( off, field_size);
     // Assign all fields in the oneof this same offset.
+    const char* oneofname = upb_oneofdef_name(oneof);
     for (upb_oneof_begin(&fit, oneof); !upb_oneof_done(&fit);
          upb_oneof_next(&fit)) {
       const upb_fielddef* field = upb_oneof_iter_field(&fit);
       layout->fields[upb_fielddef_index(field)].offset = off;
-      layout->fields[upb_fielddef_index(field)].cache_index = i;
+
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
+      zend_class_entry* old_scope = EG(scope);
+      EG(scope) = desc->klass;
+#else
+      zend_class_entry* old_scope = EG(fake_scope);
+      EG(fake_scope) = desc->klass;
+#endif
+
+#if PHP_MAJOR_VERSION < 7
+      zval member;
+      ZVAL_STRINGL(&member, oneofname, strlen(oneofname), 0);
+      zend_property_info* property_info =
+          zend_get_property_info(desc->klass, &member, true TSRMLS_CC);
+#else
+      zend_string* member = zend_string_init(oneofname, strlen(oneofname), 1);
+      zend_property_info* property_info =
+          zend_get_property_info(desc->klass, member, true);
+      zend_string_release(member);
+#endif
+
+#if PHP_MAJOR_VERSION < 7 || (PHP_MAJOR_VERSION == 7 && PHP_MINOR_VERSION == 0)
+      EG(scope) = old_scope;
+#else
+      EG(fake_scope) = old_scope;
+#endif
+
+      layout->fields[upb_fielddef_index(field)].cache_index =
+          property_info->offset;
     }
     i++;
     off += field_size;
@@ -501,29 +744,40 @@ void free_layout(MessageLayout* layout) {
 }
 
 void layout_init(MessageLayout* layout, void* storage,
-                 zval** properties_table TSRMLS_DC) {
+                 zend_object* object PHP_PROTO_TSRMLS_DC) {
   int i;
   upb_msg_field_iter it;
+
+  // Init unknown fields
+  memset(storage, 0, sizeof(void*));
+
   for (upb_msg_field_begin(&it, layout->msgdef), i = 0; !upb_msg_field_done(&it);
        upb_msg_field_next(&it), i++) {
     const upb_fielddef* field = upb_msg_iter_field(&it);
     void* memory = slot_memory(layout, storage, field);
     uint32_t* oneof_case = slot_oneof_case(layout, storage, field);
     int cache_index = slot_property_cache(layout, storage, field);
-    zval** property_ptr = &properties_table[cache_index];
+    CACHED_VALUE* property_ptr = OBJ_PROP(object, cache_index);
 
     if (upb_fielddef_containingoneof(field)) {
       memset(memory, 0, NATIVE_SLOT_MAX_SIZE);
       *oneof_case = ONEOF_CASE_NONE;
     } else if (is_map_field(field)) {
       zval_ptr_dtor(property_ptr);
-      map_field_create_with_type(map_field_type, field, property_ptr TSRMLS_CC);
-      DEREF(memory, zval**) = property_ptr;
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(*property_ptr);
+#endif
+      map_field_create_with_field(map_field_type, field,
+                                  property_ptr PHP_PROTO_TSRMLS_CC);
+      DEREF(memory, CACHED_VALUE*) = property_ptr;
     } else if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
       zval_ptr_dtor(property_ptr);
-      repeated_field_create_with_type(repeated_field_type, field,
-                                      property_ptr TSRMLS_CC);
-      DEREF(memory, zval**) = property_ptr;
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(*property_ptr);
+#endif
+      repeated_field_create_with_field(repeated_field_type, field,
+                                       property_ptr PHP_PROTO_TSRMLS_CC);
+      DEREF(memory, CACHED_VALUE*) = property_ptr;
     } else {
       native_slot_init(upb_fielddef_type(field), memory, property_ptr);
     }
@@ -537,7 +791,7 @@ static void* value_memory(const upb_fielddef* field, void* memory) {
     case UPB_TYPE_STRING:
     case UPB_TYPE_BYTES:
     case UPB_TYPE_MESSAGE:
-      memory = DEREF(memory, zval**);
+      memory = DEREF(memory, CACHED_VALUE*);
       break;
     default:
       // No operation
@@ -547,7 +801,7 @@ static void* value_memory(const upb_fielddef* field, void* memory) {
 }
 
 zval* layout_get(MessageLayout* layout, const void* storage,
-                 const upb_fielddef* field, zval** cache TSRMLS_DC) {
+                 const upb_fielddef* field, CACHED_VALUE* cache TSRMLS_DC) {
   void* memory = slot_memory(layout, storage, field);
   uint32_t* oneof_case = slot_oneof_case(layout, storage, field);
 
@@ -558,13 +812,13 @@ zval* layout_get(MessageLayout* layout, const void* storage,
       native_slot_get(upb_fielddef_type(field), value_memory(field, memory),
                       cache TSRMLS_CC);
     }
-    return *cache;
+    return CACHED_PTR_TO_ZVAL_PTR(cache);
   } else if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
-    return *cache;
+    return CACHED_PTR_TO_ZVAL_PTR(cache);
   } else {
     native_slot_get(upb_fielddef_type(field), value_memory(field, memory),
                     cache TSRMLS_CC);
-    return *cache;
+    return CACHED_PTR_TO_ZVAL_PTR(cache);
   }
 }
 
@@ -583,8 +837,7 @@ void layout_set(MessageLayout* layout, MessageHeader* header,
     switch (type) {
       case UPB_TYPE_MESSAGE: {
         const upb_msgdef* msg = upb_fielddef_msgsubdef(field);
-        zval* desc_php = get_def_obj(msg);
-        Descriptor* desc = zend_object_store_get_object(desc_php TSRMLS_CC);
+        Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(msg));
         ce = desc->klass;
         // Intentionally fall through.
       }
@@ -593,9 +846,9 @@ void layout_set(MessageLayout* layout, MessageHeader* header,
         int property_cache_index =
             header->descriptor->layout->fields[upb_fielddef_index(field)]
                 .cache_index;
-        DEREF(memory, zval**) =
-            &(header->std.properties_table)[property_cache_index];
-        memory = DEREF(memory, zval**);
+        DEREF(memory, CACHED_VALUE*) =
+            OBJ_PROP(&header->std, property_cache_index);
+        memory = DEREF(memory, CACHED_VALUE*);
         break;
       }
       default:
@@ -606,27 +859,159 @@ void layout_set(MessageLayout* layout, MessageHeader* header,
     *oneof_case = upb_fielddef_number(field);
   } else if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
     // Works for both repeated and map fields
-    memory = DEREF(memory, zval**);
-    if (EXPECTED(DEREF(memory, zval*) != val)) {
-        zval_ptr_dtor(memory);
-        DEREF(memory, zval*) = val;
-        Z_ADDREF_P(val);
+    memory = DEREF(memory, void**);
+    zval* property_ptr = CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory);
+
+    if (EXPECTED(property_ptr != val)) {
+      zend_class_entry *subce = NULL;
+      zval converted_value;
+
+      if (upb_fielddef_ismap(field)) {
+        const upb_msgdef* mapmsg = upb_fielddef_msgsubdef(field);
+        const upb_fielddef* keyfield = upb_msgdef_ntof(mapmsg, "key", 3);
+        const upb_fielddef* valuefield = upb_msgdef_ntof(mapmsg, "value", 5);
+        if (upb_fielddef_descriptortype(valuefield) ==
+            UPB_DESCRIPTOR_TYPE_MESSAGE) {
+          const upb_msgdef* submsg = upb_fielddef_msgsubdef(valuefield);
+          Descriptor* subdesc =
+              UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(submsg));
+          subce = subdesc->klass;
+        }
+        check_map_field(subce, upb_fielddef_descriptortype(keyfield),
+                        upb_fielddef_descriptortype(valuefield), val,
+                        &converted_value);
+      } else {
+        if (upb_fielddef_type(field) == UPB_TYPE_MESSAGE) {
+          const upb_msgdef* submsg = upb_fielddef_msgsubdef(field);
+          Descriptor* subdesc =
+              UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(submsg));
+          subce = subdesc->klass;
+        }
+
+        check_repeated_field(subce, upb_fielddef_descriptortype(field), val,
+                             &converted_value);
+      }
+#if PHP_MAJOR_VERSION < 7
+      REPLACE_ZVAL_VALUE((zval**)memory, &converted_value, 1);
+#else
+      php_proto_zval_ptr_dtor(property_ptr);
+      ZVAL_ZVAL(property_ptr, &converted_value, 1, 0);
+#endif
+      zval_dtor(&converted_value);
     }
   } else {
     upb_fieldtype_t type = upb_fielddef_type(field);
     zend_class_entry *ce = NULL;
     if (type == UPB_TYPE_MESSAGE) {
       const upb_msgdef* msg = upb_fielddef_msgsubdef(field);
-      zval* desc_php = get_def_obj(msg);
-      Descriptor* desc = zend_object_store_get_object(desc_php TSRMLS_CC);
+      Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(msg));
       ce = desc->klass;
     }
     native_slot_set(type, ce, value_memory(field, memory), val TSRMLS_CC);
   }
 }
 
+static void native_slot_merge(const upb_fielddef* field, const void* from_memory,
+                         void* to_memory PHP_PROTO_TSRMLS_DC) {
+  upb_fieldtype_t type = upb_fielddef_type(field);
+  zend_class_entry* ce = NULL;
+  if (!native_slot_is_default(type, from_memory)) {
+    switch (type) {
+#define CASE_TYPE(upb_type, c_type)                        \
+  case UPB_TYPE_##upb_type: {                              \
+    DEREF(to_memory, c_type) = DEREF(from_memory, c_type); \
+    break;                                                 \
+  }
+      CASE_TYPE(INT32, int32_t)
+      CASE_TYPE(UINT32, uint32_t)
+      CASE_TYPE(ENUM, int32_t)
+      CASE_TYPE(INT64, int64_t)
+      CASE_TYPE(UINT64, uint64_t)
+      CASE_TYPE(FLOAT, float)
+      CASE_TYPE(DOUBLE, double)
+      CASE_TYPE(BOOL, int8_t)
+
+#undef CASE_TYPE
+      case UPB_TYPE_STRING:
+      case UPB_TYPE_BYTES:
+        native_slot_set(type, NULL, value_memory(field, to_memory),
+                        CACHED_PTR_TO_ZVAL_PTR(DEREF(
+                            from_memory, CACHED_VALUE*)) PHP_PROTO_TSRMLS_CC);
+        break;
+      case UPB_TYPE_MESSAGE: {
+        const upb_msgdef* msg = upb_fielddef_msgsubdef(field);
+        Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(msg));
+        ce = desc->klass;
+        if (native_slot_is_default(type, to_memory)) {
+#if PHP_MAJOR_VERSION < 7
+          SEPARATE_ZVAL_IF_NOT_REF((zval**)value_memory(field, to_memory));
+#endif
+          CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(
+              CACHED_PTR_TO_ZVAL_PTR(DEREF(to_memory, CACHED_VALUE*)), ce);
+          MessageHeader* submsg =
+              UNBOX(MessageHeader,
+                    CACHED_PTR_TO_ZVAL_PTR(DEREF(to_memory, CACHED_VALUE*)));
+          custom_data_init(ce, submsg PHP_PROTO_TSRMLS_CC);
+        }
+
+        MessageHeader* sub_from =
+            UNBOX(MessageHeader,
+                  CACHED_PTR_TO_ZVAL_PTR(DEREF(from_memory, CACHED_VALUE*)));
+        MessageHeader* sub_to =
+            UNBOX(MessageHeader,
+                  CACHED_PTR_TO_ZVAL_PTR(DEREF(to_memory, CACHED_VALUE*)));
+
+        layout_merge(desc->layout, sub_from, sub_to PHP_PROTO_TSRMLS_CC);
+        break;
+      }
+    }
+  }
+}
+
+static void native_slot_merge_by_array(const upb_fielddef* field, const void* from_memory,
+                         void* to_memory PHP_PROTO_TSRMLS_DC) {
+  upb_fieldtype_t type = upb_fielddef_type(field);
+  switch (type) {
+    case UPB_TYPE_STRING:
+    case UPB_TYPE_BYTES: {
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(DEREF(to_memory, zval*));
+      PHP_PROTO_ZVAL_STRINGL(DEREF(to_memory, zval*),
+                             Z_STRVAL_P(*(zval**)from_memory),
+                             Z_STRLEN_P(*(zval**)from_memory), 1);
+#else
+      DEREF(to_memory, zend_string*) =
+          zend_string_dup(*(zend_string**)from_memory, 0);
+#endif
+      break;
+    }
+    case UPB_TYPE_MESSAGE: {
+      const upb_msgdef* msg = upb_fielddef_msgsubdef(field);
+      Descriptor* desc = UNBOX_HASHTABLE_VALUE(Descriptor, get_def_obj(msg));
+      zend_class_entry* ce = desc->klass;
+#if PHP_MAJOR_VERSION < 7
+      MAKE_STD_ZVAL(DEREF(to_memory, zval*));
+      CREATE_OBJ_ON_ALLOCATED_ZVAL_PTR(DEREF(to_memory, zval*), ce);
+#else
+      DEREF(to_memory, zend_object*) = ce->create_object(ce TSRMLS_CC);
+#endif
+      MessageHeader* sub_from = UNBOX_HASHTABLE_VALUE(
+          MessageHeader, DEREF(from_memory, PHP_PROTO_HASHTABLE_VALUE));
+      MessageHeader* sub_to = UNBOX_HASHTABLE_VALUE(
+          MessageHeader, DEREF(to_memory, PHP_PROTO_HASHTABLE_VALUE));
+      custom_data_init(ce, sub_to PHP_PROTO_TSRMLS_CC);
+
+      layout_merge(desc->layout, sub_from, sub_to PHP_PROTO_TSRMLS_CC);
+      break;
+    }
+    default:
+      native_slot_merge(field, from_memory, to_memory PHP_PROTO_TSRMLS_CC);
+      break;
+  }
+}
+
 void layout_merge(MessageLayout* layout, MessageHeader* from,
-                  MessageHeader* to TSRMLS_DC) {
+                  MessageHeader* to PHP_PROTO_TSRMLS_DC) {
   int i, j;
   upb_msg_field_iter it;
 
@@ -639,11 +1024,10 @@ void layout_merge(MessageLayout* layout, MessageHeader* from,
 
     if (upb_fielddef_containingoneof(field)) {
       uint32_t oneof_case_offset =
-          layout->fields[upb_fielddef_index(field)].case_offset +
-          sizeof(MessageHeader);
+          layout->fields[upb_fielddef_index(field)].case_offset;
       // For a oneof, check that this field is actually present -- skip all the
       // below if not.
-      if (DEREF(((uint8_t*)from + oneof_case_offset), uint32_t) !=
+      if (DEREF((message_data(from) + oneof_case_offset), uint32_t) !=
           upb_fielddef_number(field)) {
         continue;
       }
@@ -658,8 +1042,8 @@ void layout_merge(MessageLayout* layout, MessageHeader* from,
         case UPB_TYPE_BYTES: {
           int property_cache_index =
               layout->fields[upb_fielddef_index(field)].cache_index;
-          DEREF(to_memory, zval**) =
-              &(to->std.properties_table)[property_cache_index];
+          DEREF(to_memory, CACHED_VALUE*) =
+              OBJ_PROP(&to->std, property_cache_index);
           break;
         }
         default:
@@ -676,141 +1060,67 @@ void layout_merge(MessageLayout* layout, MessageHeader* from,
       int size, key_length, value_length;
       MapIter map_it;
 
-      zval* to_map_php = *DEREF(to_memory, zval**);
-      zval* from_map_php = *DEREF(from_memory, zval**);
-      Map* to_map = zend_object_store_get_object(to_map_php TSRMLS_CC);
-      Map* from_map = zend_object_store_get_object(from_map_php TSRMLS_CC);
+      zval* to_map_php =
+          CACHED_PTR_TO_ZVAL_PTR(DEREF(to_memory, CACHED_VALUE*));
+      zval* from_map_php =
+          CACHED_PTR_TO_ZVAL_PTR(DEREF(from_memory, CACHED_VALUE*));
+      Map* to_map = UNBOX(Map, to_map_php);
+      Map* from_map = UNBOX(Map, from_map_php);
 
       size = upb_strtable_count(&from_map->table);
       if (size == 0) continue;
 
+      const upb_msgdef *mapentry_def = upb_fielddef_msgsubdef(field);
+      const upb_fielddef *value_field = upb_msgdef_itof(mapentry_def, 2);
+
       for (map_begin(from_map_php, &map_it TSRMLS_CC); !map_done(&map_it);
            map_next(&map_it)) {
         const char* key = map_iter_key(&map_it, &key_length);
-        upb_value value = map_iter_value(&map_it, &value_length);
-        void* mem = upb_value_memory(&value);
-        switch (to_map->value_type) {
-          case UPB_TYPE_MESSAGE: {
-            zval* new_message;
-            message_create_with_type(to_map->msg_ce, &new_message TSRMLS_CC);
-            Z_ADDREF_P(new_message);
-
-            zval* subdesc_php = get_ce_obj(to_map->msg_ce);
-            Descriptor* subdesc =
-                zend_object_store_get_object(subdesc_php TSRMLS_CC);
-            MessageHeader* sub_from =
-                (MessageHeader*)zend_object_store_get_object(DEREF(mem, zval*)
-                                                                 TSRMLS_CC);
-            MessageHeader* sub_to =
-                (MessageHeader*)zend_object_store_get_object(
-                    new_message TSRMLS_CC);
-            layout_merge(subdesc->layout, sub_from, sub_to TSRMLS_CC);
-            DEREF(mem, zval*) = new_message;
-            break;
-          }
-          case UPB_TYPE_BYTES:
-          case UPB_TYPE_STRING:
-            Z_ADDREF_PP((zval**)mem);
-            break;
-          default:
-            break;
-        }
-        map_index_set(to_map, key, key_length, value);
+        upb_value from_value = map_iter_value(&map_it, &value_length);
+        upb_value to_value;
+        void* from_mem = upb_value_memory(&from_value);
+        void* to_mem = upb_value_memory(&to_value);
+        memset(to_mem, 0, native_slot_size(to_map->value_type));
+
+        native_slot_merge_by_array(value_field, from_mem,
+                                   to_mem PHP_PROTO_TSRMLS_CC);
+
+        map_index_set(to_map, key, key_length, to_value);
       }
 
     } else if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
-      zval* to_array_php = *DEREF(to_memory, zval**);
-      zval* from_array_php = *DEREF(from_memory, zval**);
-      RepeatedField* to_array =
-          zend_object_store_get_object(to_array_php TSRMLS_CC);
-      RepeatedField* from_array =
-          zend_object_store_get_object(from_array_php TSRMLS_CC);
-
-      int size = zend_hash_num_elements(HASH_OF(from_array->array));
+      zval* to_array_php = CACHED_PTR_TO_ZVAL_PTR(DEREF(to_memory, CACHED_VALUE*));
+      zval* from_array_php = CACHED_PTR_TO_ZVAL_PTR(DEREF(from_memory, CACHED_VALUE*));
+      RepeatedField* to_array = UNBOX(RepeatedField, to_array_php);
+      RepeatedField* from_array = UNBOX(RepeatedField, from_array_php);
+
+      int size = zend_hash_num_elements(PHP_PROTO_HASH_OF(from_array->array));
       if (size > 0) {
         for (j = 0; j < size; j++) {
-          void* memory = NULL;
-          zend_hash_index_find(HASH_OF(from_array->array), j, (void**)&memory);
-          switch (to_array->type) {
-            case UPB_TYPE_STRING:
-            case UPB_TYPE_BYTES: {
-              zval* str;
-              MAKE_STD_ZVAL(str);
-              ZVAL_STRINGL(str, Z_STRVAL_PP((zval**)memory),
-                           Z_STRLEN_PP((zval**)memory), 1);
-              memory = &str;
-              break;
-            }
-            case UPB_TYPE_MESSAGE: {
-              zval* new_message;
-              message_create_with_type(from_array->msg_ce, &new_message TSRMLS_CC);
-              Z_ADDREF_P(new_message);
-
-              zval* subdesc_php = get_ce_obj(from_array->msg_ce);
-              Descriptor* subdesc =
-                  zend_object_store_get_object(subdesc_php TSRMLS_CC);
-              MessageHeader* sub_from =
-                  (MessageHeader*)zend_object_store_get_object(
-                      DEREF(memory, zval*) TSRMLS_CC);
-              MessageHeader* sub_to =
-                  (MessageHeader*)zend_object_store_get_object(
-                      new_message TSRMLS_CC);
-              layout_merge(subdesc->layout, sub_from, sub_to TSRMLS_CC);
-
-              memory = &new_message;
-            }
-            default:
-              break;
+          void* from_memory = NULL;
+          void* to_memory =
+              ALLOC_N(char, native_slot_size(upb_fielddef_type(field)));
+          memset(to_memory, 0, native_slot_size(upb_fielddef_type(field)));
+
+          if (to_array->type == UPB_TYPE_MESSAGE) {
+            php_proto_zend_hash_index_find_zval(
+                PHP_PROTO_HASH_OF(from_array->array), j, (void**)&from_memory);
+#if PHP_MAJOR_VERSION >= 7
+            from_memory = &Z_OBJ_P((zval*)from_memory);
+#endif
+          } else {
+            php_proto_zend_hash_index_find_mem(
+                PHP_PROTO_HASH_OF(from_array->array), j, (void**)&from_memory);
           }
-          repeated_field_push_native(to_array, memory TSRMLS_CC);
-        }
-      }
-    } else {
-      upb_fieldtype_t type = upb_fielddef_type(field);
-      zend_class_entry *ce = NULL;
-      if (!native_slot_is_default(type, from_memory)) {
-        switch (type) {
-#define CASE_TYPE(upb_type, c_type)                        \
-  case UPB_TYPE_##upb_type: {                              \
-    DEREF(to_memory, c_type) = DEREF(from_memory, c_type); \
-    break;                                                 \
-  }
-          CASE_TYPE(INT32,  int32_t)
-          CASE_TYPE(UINT32, uint32_t)
-          CASE_TYPE(ENUM,   int32_t)
-          CASE_TYPE(INT64,  int64_t)
-          CASE_TYPE(UINT64, uint64_t)
-          CASE_TYPE(FLOAT,  float)
-          CASE_TYPE(DOUBLE, double)
-          CASE_TYPE(BOOL,   int8_t)
 
-#undef CASE_TYPE
-          case UPB_TYPE_STRING:
-          case UPB_TYPE_BYTES:
-            native_slot_set(type, NULL, value_memory(field, to_memory),
-                            *DEREF(from_memory, zval**) TSRMLS_CC);
-            break;
-          case UPB_TYPE_MESSAGE: {
-            const upb_msgdef* msg = upb_fielddef_msgsubdef(field);
-            zval* desc_php = get_def_obj(msg);
-            Descriptor* desc = zend_object_store_get_object(desc_php TSRMLS_CC);
-            ce = desc->klass;
-            if (native_slot_is_default(type, to_memory)) {
-              zval* new_message = NULL;
-              message_create_with_type(ce, &new_message TSRMLS_CC);
-              native_slot_set(type, ce, value_memory(field, to_memory),
-                              new_message TSRMLS_CC);
-            }
-            MessageHeader* sub_from =
-                (MessageHeader*)zend_object_store_get_object(
-                    *DEREF(from_memory, zval**) TSRMLS_CC);
-            MessageHeader* sub_to =
-                (MessageHeader*)zend_object_store_get_object(
-                    *DEREF(to_memory, zval**) TSRMLS_CC);
-            layout_merge(desc->layout, sub_from, sub_to TSRMLS_CC);
-          }
+          native_slot_merge_by_array(field, from_memory,
+                                     to_memory PHP_PROTO_TSRMLS_CC);
+          repeated_field_push_native(to_array, to_memory);
+          FREE(to_memory);
         }
       }
+    } else {
+      native_slot_merge(field, from_memory, to_memory PHP_PROTO_TSRMLS_CC);
     }
   }
 }
diff --git a/php/ext/google/protobuf/type_check.c b/php/ext/google/protobuf/type_check.c
index d12d0025..85f5051e 100644
--- a/php/ext/google/protobuf/type_check.c
+++ b/php/ext/google/protobuf/type_check.c
@@ -51,6 +51,13 @@ ZEND_BEGIN_ARG_INFO_EX(arg_check_repeated, 0, 0, 2)
   ZEND_ARG_INFO(0, klass)
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_INFO_EX(arg_check_map, 0, 0, 3)
+  ZEND_ARG_INFO(1, val)
+  ZEND_ARG_INFO(0, key_type)
+  ZEND_ARG_INFO(0, value_type)
+  ZEND_ARG_INFO(0, klass)
+ZEND_END_ARG_INFO()
+
 static zend_function_entry util_methods[] = {
   PHP_ME(Util, checkInt32,  arg_check_optional, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
   PHP_ME(Util, checkUint32, arg_check_optional, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
@@ -63,6 +70,7 @@ static zend_function_entry util_methods[] = {
   PHP_ME(Util, checkString, arg_check_optional, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
   PHP_ME(Util, checkBytes,  arg_check_optional, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
   PHP_ME(Util, checkMessage, arg_check_message, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
+  PHP_ME(Util, checkMapField,    arg_check_map, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
   PHP_ME(Util, checkRepeatedField, arg_check_repeated,
          ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
   ZEND_FE_END
@@ -317,9 +325,18 @@ CONVERT_TO_FLOAT(double);
 
 bool protobuf_convert_to_bool(zval* from, int8_t* to) {
   switch (Z_TYPE_P(from)) {
+#if PHP_MAJOR_VERSION < 7
     case IS_BOOL:
       *to = (int8_t)Z_BVAL_P(from);
       break;
+#else
+    case IS_TRUE:
+      *to = 1;
+      break;
+    case IS_FALSE:
+      *to = 0;
+      break;
+#endif
     case IS_LONG:
       *to = (int8_t)(Z_LVAL_P(from) != 0);
       break;
@@ -349,12 +366,16 @@ bool protobuf_convert_to_string(zval* from) {
     case IS_STRING: {
       return true;
     }
+#if PHP_MAJOR_VERSION < 7
     case IS_BOOL:
+#else
+    case IS_TRUE:
+    case IS_FALSE:
+#endif
     case IS_LONG:
     case IS_DOUBLE: {
-      int use_copy;
       zval tmp;
-      zend_make_printable_zval(from, &tmp, &use_copy);
+      php_proto_zend_make_printable_zval(from, &tmp);
       ZVAL_COPY_VALUE(from, &tmp);
       return true;
     }
@@ -407,24 +428,148 @@ PHP_METHOD(Util, checkMessage) {
   RETURN_ZVAL(val, 1, 0);
 }
 
+void check_repeated_field(const zend_class_entry* klass, PHP_PROTO_LONG type,
+                          zval* val, zval* return_value) {
+#if PHP_MAJOR_VERSION >= 7
+  if (Z_ISREF_P(val)) {
+    ZVAL_DEREF(val);
+  }
+#endif
+
+  TSRMLS_FETCH();
+  if (Z_TYPE_P(val) == IS_ARRAY) {
+    HashTable* table = HASH_OF(val);
+    HashPosition pointer;
+    void* memory;
+
+#if PHP_MAJOR_VERSION < 7
+    zval* repeated_field;
+    MAKE_STD_ZVAL(repeated_field);
+#else
+    zval repeated_field;
+#endif
+
+    repeated_field_create_with_type(repeated_field_type, to_fieldtype(type),
+                                    klass, &repeated_field TSRMLS_CC);
+
+    for (zend_hash_internal_pointer_reset_ex(table, &pointer);
+         php_proto_zend_hash_get_current_data_ex(table, (void**)&memory,
+                                                 &pointer) == SUCCESS;
+         zend_hash_move_forward_ex(table, &pointer)) {
+      repeated_field_handlers->write_dimension(
+          CACHED_TO_ZVAL_PTR(repeated_field), NULL,
+          CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)memory) TSRMLS_CC);
+    }
+
+    RETURN_ZVAL(CACHED_TO_ZVAL_PTR(repeated_field), 1, 1);
+
+  } else if (Z_TYPE_P(val) == IS_OBJECT) {
+    if (!instanceof_function(Z_OBJCE_P(val), repeated_field_type TSRMLS_CC)) {
+      zend_error(E_USER_ERROR, "Given value is not an instance of %s.",
+                 repeated_field_type->name);
+      return;
+    }
+    RepeatedField* intern = UNBOX(RepeatedField, val);
+    if (to_fieldtype(type) != intern->type) {
+      zend_error(E_USER_ERROR, "Incorrect repeated field type.");
+      return;
+    }
+    if (klass != NULL && intern->msg_ce != klass) {
+      zend_error(E_USER_ERROR,
+                 "Expect a repeated field of %s, but %s is given.", klass->name,
+                 intern->msg_ce->name);
+      return;
+    }
+    RETURN_ZVAL(val, 1, 0);
+  } else {
+    zend_error(E_USER_ERROR, "Incorrect repeated field type.");
+    return;
+  }
+}
+
 PHP_METHOD(Util, checkRepeatedField) {
   zval* val;
-  long type;
+  PHP_PROTO_LONG type;
   const zend_class_entry* klass = NULL;
-  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "Ol|C", &val,
-                            repeated_field_type, &type, &klass) == FAILURE) {
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "zl|C", &val, &type,
+                            &klass) == FAILURE) {
     return;
   }
+  RETURN_ZVAL(val, 1, 0);
+}
 
-  RepeatedField *intern =
-      (RepeatedField *)zend_object_store_get_object(val TSRMLS_CC);
-  if (to_fieldtype(type) != intern->type) {
-    zend_error(E_USER_ERROR, "Incorrect repeated field type.");
+void check_map_field(const zend_class_entry* klass, PHP_PROTO_LONG key_type,
+                     PHP_PROTO_LONG value_type, zval* val, zval* return_value) {
+#if PHP_MAJOR_VERSION >= 7
+  if (Z_ISREF_P(val)) {
+    ZVAL_DEREF(val);
+  }
+#endif
+
+  TSRMLS_FETCH();
+  if (Z_TYPE_P(val) == IS_ARRAY) {
+    HashTable* table = Z_ARRVAL_P(val);
+    HashPosition pointer;
+    zval key;
+    void* value;
+
+#if PHP_MAJOR_VERSION < 7
+    zval* map_field;
+    MAKE_STD_ZVAL(map_field);
+#else
+    zval map_field;
+#endif
+
+    map_field_create_with_type(map_field_type, to_fieldtype(key_type),
+                               to_fieldtype(value_type), klass,
+                               &map_field TSRMLS_CC);
+
+    for (zend_hash_internal_pointer_reset_ex(table, &pointer);
+         php_proto_zend_hash_get_current_data_ex(table, (void**)&value,
+                                                 &pointer) == SUCCESS;
+         zend_hash_move_forward_ex(table, &pointer)) {
+      zend_hash_get_current_key_zval_ex(table, &key, &pointer);
+      map_field_handlers->write_dimension(
+          CACHED_TO_ZVAL_PTR(map_field), &key,
+          CACHED_PTR_TO_ZVAL_PTR((CACHED_VALUE*)value) TSRMLS_CC);
+      zval_dtor(&key);
+    }
+
+    RETURN_ZVAL(CACHED_TO_ZVAL_PTR(map_field), 1, 1);
+  } else if (Z_TYPE_P(val) == IS_OBJECT) {
+    if (!instanceof_function(Z_OBJCE_P(val), map_field_type TSRMLS_CC)) {
+      zend_error(E_USER_ERROR, "Given value is not an instance of %s.",
+                 map_field_type->name);
+      return;
+    }
+    Map* intern = UNBOX(Map, val);
+    if (to_fieldtype(key_type) != intern->key_type) {
+      zend_error(E_USER_ERROR, "Incorrect map field key type.");
+      return;
+    }
+    if (to_fieldtype(value_type) != intern->value_type) {
+      zend_error(E_USER_ERROR, "Incorrect map field value type.");
+      return;
+    }
+    if (klass != NULL && intern->msg_ce != klass) {
+      zend_error(E_USER_ERROR, "Expect a map field of %s, but %s is given.",
+                 klass->name, intern->msg_ce->name);
+      return;
+    }
+    RETURN_ZVAL(val, 1, 0);
+  } else {
+    zend_error(E_USER_ERROR, "Incorrect map field type.");
     return;
   }
-  if (klass != NULL && intern->msg_ce != klass) {
-    zend_error(E_USER_ERROR, "Expect a repeated field of %s, but %s is given.",
-               klass->name, intern->msg_ce->name);
+}
+
+PHP_METHOD(Util, checkMapField) {
+  zval* val;
+  PHP_PROTO_LONG key_type, value_type;
+  const zend_class_entry* klass = NULL;
+  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "zll|C", &val, &key_type,
+                            &value_type, &klass) == FAILURE) {
     return;
   }
+  RETURN_ZVAL(val, 1, 0);
 }
diff --git a/php/ext/google/protobuf/upb.c b/php/ext/google/protobuf/upb.c
index e0c56f8e..e01f3bfd 100644
--- a/php/ext/google/protobuf/upb.c
+++ b/php/ext/google/protobuf/upb.c
@@ -1,5 +1,2507 @@
 // Amalgamated source file
 #include "upb.h"
+/* This file was generated by upbc (the upb compiler) from the input
+ * file:
+ *
+ *     google/protobuf/descriptor.proto
+ *
+ * Do not edit -- your changes will be discarded when the file is
+ * regenerated. */
+
+#include <stddef.h>
+
+
+struct google_protobuf_FileDescriptorSet {
+  upb_array* file;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_FileDescriptorSet_submsgs[1] = {
+  &google_protobuf_FileDescriptorProto_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_FileDescriptorSet__fields[1] = {
+  {1, offsetof(google_protobuf_FileDescriptorSet, file), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_FileDescriptorSet_msginit = {
+  &google_protobuf_FileDescriptorSet_submsgs[0],
+  &google_protobuf_FileDescriptorSet__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_FileDescriptorSet), 1, 0, false, true
+};
+
+google_protobuf_FileDescriptorSet *google_protobuf_FileDescriptorSet_new(upb_env *env) {
+  google_protobuf_FileDescriptorSet *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_FileDescriptorSet *google_protobuf_FileDescriptorSet_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_FileDescriptorSet *msg = google_protobuf_FileDescriptorSet_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_FileDescriptorSet_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_FileDescriptorSet_serialize(google_protobuf_FileDescriptorSet *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_FileDescriptorSet_msginit, env, size);
+}
+const upb_array* google_protobuf_FileDescriptorSet_file(const google_protobuf_FileDescriptorSet *msg) {
+  return msg->file;
+}
+void google_protobuf_FileDescriptorSet_set_file(google_protobuf_FileDescriptorSet *msg, upb_array* value) {
+  msg->file = value;
+}
+struct google_protobuf_FileDescriptorProto {
+  upb_stringview name;
+  upb_stringview package;
+  upb_stringview syntax;
+  google_protobuf_FileOptions* options;
+  google_protobuf_SourceCodeInfo* source_code_info;
+  upb_array* dependency;
+  upb_array* message_type;
+  upb_array* enum_type;
+  upb_array* service;
+  upb_array* extension;
+  upb_array* public_dependency;
+  upb_array* weak_dependency;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_FileDescriptorProto_submsgs[6] = {
+  &google_protobuf_DescriptorProto_msginit,
+  &google_protobuf_EnumDescriptorProto_msginit,
+  &google_protobuf_FieldDescriptorProto_msginit,
+  &google_protobuf_FileOptions_msginit,
+  &google_protobuf_ServiceDescriptorProto_msginit,
+  &google_protobuf_SourceCodeInfo_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_FileDescriptorProto__fields[12] = {
+  {1, offsetof(google_protobuf_FileDescriptorProto, name), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_FileDescriptorProto, package), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {3, offsetof(google_protobuf_FileDescriptorProto, dependency), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 3},
+  {4, offsetof(google_protobuf_FileDescriptorProto, message_type), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+  {5, offsetof(google_protobuf_FileDescriptorProto, enum_type), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 1, 11, 3},
+  {6, offsetof(google_protobuf_FileDescriptorProto, service), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 4, 11, 3},
+  {7, offsetof(google_protobuf_FileDescriptorProto, extension), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 2, 11, 3},
+  {8, offsetof(google_protobuf_FileDescriptorProto, options), 3, UPB_NOT_IN_ONEOF, 3, 11, 1},
+  {9, offsetof(google_protobuf_FileDescriptorProto, source_code_info), 4, UPB_NOT_IN_ONEOF, 5, 11, 1},
+  {10, offsetof(google_protobuf_FileDescriptorProto, public_dependency), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 3},
+  {11, offsetof(google_protobuf_FileDescriptorProto, weak_dependency), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 3},
+  {12, offsetof(google_protobuf_FileDescriptorProto, syntax), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_FileDescriptorProto_msginit = {
+  &google_protobuf_FileDescriptorProto_submsgs[0],
+  &google_protobuf_FileDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_FileDescriptorProto), 12, 0, false, true
+};
+
+google_protobuf_FileDescriptorProto *google_protobuf_FileDescriptorProto_new(upb_env *env) {
+  google_protobuf_FileDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_FileDescriptorProto *google_protobuf_FileDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_FileDescriptorProto *msg = google_protobuf_FileDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_FileDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_FileDescriptorProto_serialize(google_protobuf_FileDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_FileDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_FileDescriptorProto_name(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_FileDescriptorProto_set_name(google_protobuf_FileDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+upb_stringview google_protobuf_FileDescriptorProto_package(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->package;
+}
+void google_protobuf_FileDescriptorProto_set_package(google_protobuf_FileDescriptorProto *msg, upb_stringview value) {
+  msg->package = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_dependency(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->dependency;
+}
+void google_protobuf_FileDescriptorProto_set_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->dependency = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_message_type(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->message_type;
+}
+void google_protobuf_FileDescriptorProto_set_message_type(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->message_type = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_enum_type(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->enum_type;
+}
+void google_protobuf_FileDescriptorProto_set_enum_type(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->enum_type = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_service(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->service;
+}
+void google_protobuf_FileDescriptorProto_set_service(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->service = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_extension(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->extension;
+}
+void google_protobuf_FileDescriptorProto_set_extension(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->extension = value;
+}
+const google_protobuf_FileOptions* google_protobuf_FileDescriptorProto_options(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_FileDescriptorProto_set_options(google_protobuf_FileDescriptorProto *msg, google_protobuf_FileOptions* value) {
+  msg->options = value;
+}
+const google_protobuf_SourceCodeInfo* google_protobuf_FileDescriptorProto_source_code_info(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->source_code_info;
+}
+void google_protobuf_FileDescriptorProto_set_source_code_info(google_protobuf_FileDescriptorProto *msg, google_protobuf_SourceCodeInfo* value) {
+  msg->source_code_info = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_public_dependency(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->public_dependency;
+}
+void google_protobuf_FileDescriptorProto_set_public_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->public_dependency = value;
+}
+const upb_array* google_protobuf_FileDescriptorProto_weak_dependency(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->weak_dependency;
+}
+void google_protobuf_FileDescriptorProto_set_weak_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value) {
+  msg->weak_dependency = value;
+}
+upb_stringview google_protobuf_FileDescriptorProto_syntax(const google_protobuf_FileDescriptorProto *msg) {
+  return msg->syntax;
+}
+void google_protobuf_FileDescriptorProto_set_syntax(google_protobuf_FileDescriptorProto *msg, upb_stringview value) {
+  msg->syntax = value;
+}
+struct google_protobuf_DescriptorProto {
+  upb_stringview name;
+  google_protobuf_MessageOptions* options;
+  upb_array* field;
+  upb_array* nested_type;
+  upb_array* enum_type;
+  upb_array* extension_range;
+  upb_array* extension;
+  upb_array* oneof_decl;
+  upb_array* reserved_range;
+  upb_array* reserved_name;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_DescriptorProto_submsgs[8] = {
+  &google_protobuf_DescriptorProto_msginit,
+  &google_protobuf_DescriptorProto_ExtensionRange_msginit,
+  &google_protobuf_DescriptorProto_ReservedRange_msginit,
+  &google_protobuf_EnumDescriptorProto_msginit,
+  &google_protobuf_FieldDescriptorProto_msginit,
+  &google_protobuf_MessageOptions_msginit,
+  &google_protobuf_OneofDescriptorProto_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_DescriptorProto__fields[10] = {
+  {1, offsetof(google_protobuf_DescriptorProto, name), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_DescriptorProto, field), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 4, 11, 3},
+  {3, offsetof(google_protobuf_DescriptorProto, nested_type), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+  {4, offsetof(google_protobuf_DescriptorProto, enum_type), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 3, 11, 3},
+  {5, offsetof(google_protobuf_DescriptorProto, extension_range), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 1, 11, 3},
+  {6, offsetof(google_protobuf_DescriptorProto, extension), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 4, 11, 3},
+  {7, offsetof(google_protobuf_DescriptorProto, options), 1, UPB_NOT_IN_ONEOF, 5, 11, 1},
+  {8, offsetof(google_protobuf_DescriptorProto, oneof_decl), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 6, 11, 3},
+  {9, offsetof(google_protobuf_DescriptorProto, reserved_range), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 2, 11, 3},
+  {10, offsetof(google_protobuf_DescriptorProto, reserved_name), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_msginit = {
+  &google_protobuf_DescriptorProto_submsgs[0],
+  &google_protobuf_DescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_DescriptorProto), 10, 0, false, true
+};
+
+google_protobuf_DescriptorProto *google_protobuf_DescriptorProto_new(upb_env *env) {
+  google_protobuf_DescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_DescriptorProto *google_protobuf_DescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_DescriptorProto *msg = google_protobuf_DescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_DescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_DescriptorProto_serialize(google_protobuf_DescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_DescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_DescriptorProto_name(const google_protobuf_DescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_DescriptorProto_set_name(google_protobuf_DescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+const upb_array* google_protobuf_DescriptorProto_field(const google_protobuf_DescriptorProto *msg) {
+  return msg->field;
+}
+void google_protobuf_DescriptorProto_set_field(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->field = value;
+}
+const upb_array* google_protobuf_DescriptorProto_nested_type(const google_protobuf_DescriptorProto *msg) {
+  return msg->nested_type;
+}
+void google_protobuf_DescriptorProto_set_nested_type(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->nested_type = value;
+}
+const upb_array* google_protobuf_DescriptorProto_enum_type(const google_protobuf_DescriptorProto *msg) {
+  return msg->enum_type;
+}
+void google_protobuf_DescriptorProto_set_enum_type(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->enum_type = value;
+}
+const upb_array* google_protobuf_DescriptorProto_extension_range(const google_protobuf_DescriptorProto *msg) {
+  return msg->extension_range;
+}
+void google_protobuf_DescriptorProto_set_extension_range(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->extension_range = value;
+}
+const upb_array* google_protobuf_DescriptorProto_extension(const google_protobuf_DescriptorProto *msg) {
+  return msg->extension;
+}
+void google_protobuf_DescriptorProto_set_extension(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->extension = value;
+}
+const google_protobuf_MessageOptions* google_protobuf_DescriptorProto_options(const google_protobuf_DescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_DescriptorProto_set_options(google_protobuf_DescriptorProto *msg, google_protobuf_MessageOptions* value) {
+  msg->options = value;
+}
+const upb_array* google_protobuf_DescriptorProto_oneof_decl(const google_protobuf_DescriptorProto *msg) {
+  return msg->oneof_decl;
+}
+void google_protobuf_DescriptorProto_set_oneof_decl(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->oneof_decl = value;
+}
+const upb_array* google_protobuf_DescriptorProto_reserved_range(const google_protobuf_DescriptorProto *msg) {
+  return msg->reserved_range;
+}
+void google_protobuf_DescriptorProto_set_reserved_range(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->reserved_range = value;
+}
+const upb_array* google_protobuf_DescriptorProto_reserved_name(const google_protobuf_DescriptorProto *msg) {
+  return msg->reserved_name;
+}
+void google_protobuf_DescriptorProto_set_reserved_name(google_protobuf_DescriptorProto *msg, upb_array* value) {
+  msg->reserved_name = value;
+}
+struct google_protobuf_DescriptorProto_ExtensionRange {
+  int32_t start;
+  int32_t end;
+  google_protobuf_ExtensionRangeOptions* options;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_DescriptorProto_ExtensionRange_submsgs[1] = {
+  &google_protobuf_ExtensionRangeOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_DescriptorProto_ExtensionRange__fields[3] = {
+  {1, offsetof(google_protobuf_DescriptorProto_ExtensionRange, start), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {2, offsetof(google_protobuf_DescriptorProto_ExtensionRange, end), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {3, offsetof(google_protobuf_DescriptorProto_ExtensionRange, options), 2, UPB_NOT_IN_ONEOF, 0, 11, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_ExtensionRange_msginit = {
+  &google_protobuf_DescriptorProto_ExtensionRange_submsgs[0],
+  &google_protobuf_DescriptorProto_ExtensionRange__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_DescriptorProto_ExtensionRange), 3, 0, false, true
+};
+
+google_protobuf_DescriptorProto_ExtensionRange *google_protobuf_DescriptorProto_ExtensionRange_new(upb_env *env) {
+  google_protobuf_DescriptorProto_ExtensionRange *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_DescriptorProto_ExtensionRange *google_protobuf_DescriptorProto_ExtensionRange_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_DescriptorProto_ExtensionRange *msg = google_protobuf_DescriptorProto_ExtensionRange_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_DescriptorProto_ExtensionRange_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_DescriptorProto_ExtensionRange_serialize(google_protobuf_DescriptorProto_ExtensionRange *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_DescriptorProto_ExtensionRange_msginit, env, size);
+}
+int32_t google_protobuf_DescriptorProto_ExtensionRange_start(const google_protobuf_DescriptorProto_ExtensionRange *msg) {
+  return msg->start;
+}
+void google_protobuf_DescriptorProto_ExtensionRange_set_start(google_protobuf_DescriptorProto_ExtensionRange *msg, int32_t value) {
+  msg->start = value;
+}
+int32_t google_protobuf_DescriptorProto_ExtensionRange_end(const google_protobuf_DescriptorProto_ExtensionRange *msg) {
+  return msg->end;
+}
+void google_protobuf_DescriptorProto_ExtensionRange_set_end(google_protobuf_DescriptorProto_ExtensionRange *msg, int32_t value) {
+  msg->end = value;
+}
+const google_protobuf_ExtensionRangeOptions* google_protobuf_DescriptorProto_ExtensionRange_options(const google_protobuf_DescriptorProto_ExtensionRange *msg) {
+  return msg->options;
+}
+void google_protobuf_DescriptorProto_ExtensionRange_set_options(google_protobuf_DescriptorProto_ExtensionRange *msg, google_protobuf_ExtensionRangeOptions* value) {
+  msg->options = value;
+}
+struct google_protobuf_DescriptorProto_ReservedRange {
+  int32_t start;
+  int32_t end;
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_DescriptorProto_ReservedRange__fields[2] = {
+  {1, offsetof(google_protobuf_DescriptorProto_ReservedRange, start), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {2, offsetof(google_protobuf_DescriptorProto_ReservedRange, end), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_ReservedRange_msginit = {
+  NULL,
+  &google_protobuf_DescriptorProto_ReservedRange__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_DescriptorProto_ReservedRange), 2, 0, false, true
+};
+
+google_protobuf_DescriptorProto_ReservedRange *google_protobuf_DescriptorProto_ReservedRange_new(upb_env *env) {
+  google_protobuf_DescriptorProto_ReservedRange *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_DescriptorProto_ReservedRange *google_protobuf_DescriptorProto_ReservedRange_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_DescriptorProto_ReservedRange *msg = google_protobuf_DescriptorProto_ReservedRange_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_DescriptorProto_ReservedRange_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_DescriptorProto_ReservedRange_serialize(google_protobuf_DescriptorProto_ReservedRange *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_DescriptorProto_ReservedRange_msginit, env, size);
+}
+int32_t google_protobuf_DescriptorProto_ReservedRange_start(const google_protobuf_DescriptorProto_ReservedRange *msg) {
+  return msg->start;
+}
+void google_protobuf_DescriptorProto_ReservedRange_set_start(google_protobuf_DescriptorProto_ReservedRange *msg, int32_t value) {
+  msg->start = value;
+}
+int32_t google_protobuf_DescriptorProto_ReservedRange_end(const google_protobuf_DescriptorProto_ReservedRange *msg) {
+  return msg->end;
+}
+void google_protobuf_DescriptorProto_ReservedRange_set_end(google_protobuf_DescriptorProto_ReservedRange *msg, int32_t value) {
+  msg->end = value;
+}
+struct google_protobuf_ExtensionRangeOptions {
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_ExtensionRangeOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_ExtensionRangeOptions__fields[1] = {
+  {999, offsetof(google_protobuf_ExtensionRangeOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_ExtensionRangeOptions_msginit = {
+  &google_protobuf_ExtensionRangeOptions_submsgs[0],
+  &google_protobuf_ExtensionRangeOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_ExtensionRangeOptions), 1, 0, false, true
+};
+
+google_protobuf_ExtensionRangeOptions *google_protobuf_ExtensionRangeOptions_new(upb_env *env) {
+  google_protobuf_ExtensionRangeOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_ExtensionRangeOptions *google_protobuf_ExtensionRangeOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_ExtensionRangeOptions *msg = google_protobuf_ExtensionRangeOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_ExtensionRangeOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_ExtensionRangeOptions_serialize(google_protobuf_ExtensionRangeOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_ExtensionRangeOptions_msginit, env, size);
+}
+const upb_array* google_protobuf_ExtensionRangeOptions_uninterpreted_option(const google_protobuf_ExtensionRangeOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_ExtensionRangeOptions_set_uninterpreted_option(google_protobuf_ExtensionRangeOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_FieldDescriptorProto {
+  google_protobuf_FieldDescriptorProto_Label label;
+  google_protobuf_FieldDescriptorProto_Type type;
+  int32_t number;
+  int32_t oneof_index;
+  upb_stringview name;
+  upb_stringview extendee;
+  upb_stringview type_name;
+  upb_stringview default_value;
+  upb_stringview json_name;
+  google_protobuf_FieldOptions* options;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_FieldDescriptorProto_submsgs[1] = {
+  &google_protobuf_FieldOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_FieldDescriptorProto__fields[10] = {
+  {1, offsetof(google_protobuf_FieldDescriptorProto, name), 4, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_FieldDescriptorProto, extendee), 5, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {3, offsetof(google_protobuf_FieldDescriptorProto, number), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {4, offsetof(google_protobuf_FieldDescriptorProto, label), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {5, offsetof(google_protobuf_FieldDescriptorProto, type), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {6, offsetof(google_protobuf_FieldDescriptorProto, type_name), 6, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {7, offsetof(google_protobuf_FieldDescriptorProto, default_value), 7, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {8, offsetof(google_protobuf_FieldDescriptorProto, options), 9, UPB_NOT_IN_ONEOF, 0, 11, 1},
+  {9, offsetof(google_protobuf_FieldDescriptorProto, oneof_index), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {10, offsetof(google_protobuf_FieldDescriptorProto, json_name), 8, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_FieldDescriptorProto_msginit = {
+  &google_protobuf_FieldDescriptorProto_submsgs[0],
+  &google_protobuf_FieldDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_FieldDescriptorProto), 10, 0, false, true
+};
+
+google_protobuf_FieldDescriptorProto *google_protobuf_FieldDescriptorProto_new(upb_env *env) {
+  google_protobuf_FieldDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_FieldDescriptorProto *google_protobuf_FieldDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_FieldDescriptorProto *msg = google_protobuf_FieldDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_FieldDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_FieldDescriptorProto_serialize(google_protobuf_FieldDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_FieldDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_FieldDescriptorProto_name(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_FieldDescriptorProto_set_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+upb_stringview google_protobuf_FieldDescriptorProto_extendee(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->extendee;
+}
+void google_protobuf_FieldDescriptorProto_set_extendee(google_protobuf_FieldDescriptorProto *msg, upb_stringview value) {
+  msg->extendee = value;
+}
+int32_t google_protobuf_FieldDescriptorProto_number(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->number;
+}
+void google_protobuf_FieldDescriptorProto_set_number(google_protobuf_FieldDescriptorProto *msg, int32_t value) {
+  msg->number = value;
+}
+google_protobuf_FieldDescriptorProto_Label google_protobuf_FieldDescriptorProto_label(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->label;
+}
+void google_protobuf_FieldDescriptorProto_set_label(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldDescriptorProto_Label value) {
+  msg->label = value;
+}
+google_protobuf_FieldDescriptorProto_Type google_protobuf_FieldDescriptorProto_type(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->type;
+}
+void google_protobuf_FieldDescriptorProto_set_type(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldDescriptorProto_Type value) {
+  msg->type = value;
+}
+upb_stringview google_protobuf_FieldDescriptorProto_type_name(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->type_name;
+}
+void google_protobuf_FieldDescriptorProto_set_type_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value) {
+  msg->type_name = value;
+}
+upb_stringview google_protobuf_FieldDescriptorProto_default_value(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->default_value;
+}
+void google_protobuf_FieldDescriptorProto_set_default_value(google_protobuf_FieldDescriptorProto *msg, upb_stringview value) {
+  msg->default_value = value;
+}
+const google_protobuf_FieldOptions* google_protobuf_FieldDescriptorProto_options(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_FieldDescriptorProto_set_options(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldOptions* value) {
+  msg->options = value;
+}
+int32_t google_protobuf_FieldDescriptorProto_oneof_index(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->oneof_index;
+}
+void google_protobuf_FieldDescriptorProto_set_oneof_index(google_protobuf_FieldDescriptorProto *msg, int32_t value) {
+  msg->oneof_index = value;
+}
+upb_stringview google_protobuf_FieldDescriptorProto_json_name(const google_protobuf_FieldDescriptorProto *msg) {
+  return msg->json_name;
+}
+void google_protobuf_FieldDescriptorProto_set_json_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value) {
+  msg->json_name = value;
+}
+struct google_protobuf_OneofDescriptorProto {
+  upb_stringview name;
+  google_protobuf_OneofOptions* options;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_OneofDescriptorProto_submsgs[1] = {
+  &google_protobuf_OneofOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_OneofDescriptorProto__fields[2] = {
+  {1, offsetof(google_protobuf_OneofDescriptorProto, name), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_OneofDescriptorProto, options), 1, UPB_NOT_IN_ONEOF, 0, 11, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_OneofDescriptorProto_msginit = {
+  &google_protobuf_OneofDescriptorProto_submsgs[0],
+  &google_protobuf_OneofDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_OneofDescriptorProto), 2, 0, false, true
+};
+
+google_protobuf_OneofDescriptorProto *google_protobuf_OneofDescriptorProto_new(upb_env *env) {
+  google_protobuf_OneofDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_OneofDescriptorProto *google_protobuf_OneofDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_OneofDescriptorProto *msg = google_protobuf_OneofDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_OneofDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_OneofDescriptorProto_serialize(google_protobuf_OneofDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_OneofDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_OneofDescriptorProto_name(const google_protobuf_OneofDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_OneofDescriptorProto_set_name(google_protobuf_OneofDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+const google_protobuf_OneofOptions* google_protobuf_OneofDescriptorProto_options(const google_protobuf_OneofDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_OneofDescriptorProto_set_options(google_protobuf_OneofDescriptorProto *msg, google_protobuf_OneofOptions* value) {
+  msg->options = value;
+}
+struct google_protobuf_EnumDescriptorProto {
+  upb_stringview name;
+  google_protobuf_EnumOptions* options;
+  upb_array* value;
+  upb_array* reserved_range;
+  upb_array* reserved_name;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_EnumDescriptorProto_submsgs[3] = {
+  &google_protobuf_EnumDescriptorProto_EnumReservedRange_msginit,
+  &google_protobuf_EnumOptions_msginit,
+  &google_protobuf_EnumValueDescriptorProto_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_EnumDescriptorProto__fields[5] = {
+  {1, offsetof(google_protobuf_EnumDescriptorProto, name), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_EnumDescriptorProto, value), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 2, 11, 3},
+  {3, offsetof(google_protobuf_EnumDescriptorProto, options), 1, UPB_NOT_IN_ONEOF, 1, 11, 1},
+  {4, offsetof(google_protobuf_EnumDescriptorProto, reserved_range), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+  {5, offsetof(google_protobuf_EnumDescriptorProto, reserved_name), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_EnumDescriptorProto_msginit = {
+  &google_protobuf_EnumDescriptorProto_submsgs[0],
+  &google_protobuf_EnumDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_EnumDescriptorProto), 5, 0, false, true
+};
+
+google_protobuf_EnumDescriptorProto *google_protobuf_EnumDescriptorProto_new(upb_env *env) {
+  google_protobuf_EnumDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_EnumDescriptorProto *google_protobuf_EnumDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_EnumDescriptorProto *msg = google_protobuf_EnumDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_EnumDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_EnumDescriptorProto_serialize(google_protobuf_EnumDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_EnumDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_EnumDescriptorProto_name(const google_protobuf_EnumDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_EnumDescriptorProto_set_name(google_protobuf_EnumDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+const upb_array* google_protobuf_EnumDescriptorProto_value(const google_protobuf_EnumDescriptorProto *msg) {
+  return msg->value;
+}
+void google_protobuf_EnumDescriptorProto_set_value(google_protobuf_EnumDescriptorProto *msg, upb_array* value) {
+  msg->value = value;
+}
+const google_protobuf_EnumOptions* google_protobuf_EnumDescriptorProto_options(const google_protobuf_EnumDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_EnumDescriptorProto_set_options(google_protobuf_EnumDescriptorProto *msg, google_protobuf_EnumOptions* value) {
+  msg->options = value;
+}
+const upb_array* google_protobuf_EnumDescriptorProto_reserved_range(const google_protobuf_EnumDescriptorProto *msg) {
+  return msg->reserved_range;
+}
+void google_protobuf_EnumDescriptorProto_set_reserved_range(google_protobuf_EnumDescriptorProto *msg, upb_array* value) {
+  msg->reserved_range = value;
+}
+const upb_array* google_protobuf_EnumDescriptorProto_reserved_name(const google_protobuf_EnumDescriptorProto *msg) {
+  return msg->reserved_name;
+}
+void google_protobuf_EnumDescriptorProto_set_reserved_name(google_protobuf_EnumDescriptorProto *msg, upb_array* value) {
+  msg->reserved_name = value;
+}
+struct google_protobuf_EnumDescriptorProto_EnumReservedRange {
+  int32_t start;
+  int32_t end;
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_EnumDescriptorProto_EnumReservedRange__fields[2] = {
+  {1, offsetof(google_protobuf_EnumDescriptorProto_EnumReservedRange, start), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {2, offsetof(google_protobuf_EnumDescriptorProto_EnumReservedRange, end), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_EnumDescriptorProto_EnumReservedRange_msginit = {
+  NULL,
+  &google_protobuf_EnumDescriptorProto_EnumReservedRange__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_EnumDescriptorProto_EnumReservedRange), 2, 0, false, true
+};
+
+google_protobuf_EnumDescriptorProto_EnumReservedRange *google_protobuf_EnumDescriptorProto_EnumReservedRange_new(upb_env *env) {
+  google_protobuf_EnumDescriptorProto_EnumReservedRange *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_EnumDescriptorProto_EnumReservedRange *google_protobuf_EnumDescriptorProto_EnumReservedRange_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_EnumDescriptorProto_EnumReservedRange *msg = google_protobuf_EnumDescriptorProto_EnumReservedRange_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_EnumDescriptorProto_EnumReservedRange_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_EnumDescriptorProto_EnumReservedRange_serialize(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_EnumDescriptorProto_EnumReservedRange_msginit, env, size);
+}
+int32_t google_protobuf_EnumDescriptorProto_EnumReservedRange_start(const google_protobuf_EnumDescriptorProto_EnumReservedRange *msg) {
+  return msg->start;
+}
+void google_protobuf_EnumDescriptorProto_EnumReservedRange_set_start(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, int32_t value) {
+  msg->start = value;
+}
+int32_t google_protobuf_EnumDescriptorProto_EnumReservedRange_end(const google_protobuf_EnumDescriptorProto_EnumReservedRange *msg) {
+  return msg->end;
+}
+void google_protobuf_EnumDescriptorProto_EnumReservedRange_set_end(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, int32_t value) {
+  msg->end = value;
+}
+struct google_protobuf_EnumValueDescriptorProto {
+  int32_t number;
+  upb_stringview name;
+  google_protobuf_EnumValueOptions* options;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_EnumValueDescriptorProto_submsgs[1] = {
+  &google_protobuf_EnumValueOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_EnumValueDescriptorProto__fields[3] = {
+  {1, offsetof(google_protobuf_EnumValueDescriptorProto, name), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_EnumValueDescriptorProto, number), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {3, offsetof(google_protobuf_EnumValueDescriptorProto, options), 2, UPB_NOT_IN_ONEOF, 0, 11, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_EnumValueDescriptorProto_msginit = {
+  &google_protobuf_EnumValueDescriptorProto_submsgs[0],
+  &google_protobuf_EnumValueDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_EnumValueDescriptorProto), 3, 0, false, true
+};
+
+google_protobuf_EnumValueDescriptorProto *google_protobuf_EnumValueDescriptorProto_new(upb_env *env) {
+  google_protobuf_EnumValueDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_EnumValueDescriptorProto *google_protobuf_EnumValueDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_EnumValueDescriptorProto *msg = google_protobuf_EnumValueDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_EnumValueDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_EnumValueDescriptorProto_serialize(google_protobuf_EnumValueDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_EnumValueDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_EnumValueDescriptorProto_name(const google_protobuf_EnumValueDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_EnumValueDescriptorProto_set_name(google_protobuf_EnumValueDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+int32_t google_protobuf_EnumValueDescriptorProto_number(const google_protobuf_EnumValueDescriptorProto *msg) {
+  return msg->number;
+}
+void google_protobuf_EnumValueDescriptorProto_set_number(google_protobuf_EnumValueDescriptorProto *msg, int32_t value) {
+  msg->number = value;
+}
+const google_protobuf_EnumValueOptions* google_protobuf_EnumValueDescriptorProto_options(const google_protobuf_EnumValueDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_EnumValueDescriptorProto_set_options(google_protobuf_EnumValueDescriptorProto *msg, google_protobuf_EnumValueOptions* value) {
+  msg->options = value;
+}
+struct google_protobuf_ServiceDescriptorProto {
+  upb_stringview name;
+  google_protobuf_ServiceOptions* options;
+  upb_array* method;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_ServiceDescriptorProto_submsgs[2] = {
+  &google_protobuf_MethodDescriptorProto_msginit,
+  &google_protobuf_ServiceOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_ServiceDescriptorProto__fields[3] = {
+  {1, offsetof(google_protobuf_ServiceDescriptorProto, name), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_ServiceDescriptorProto, method), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+  {3, offsetof(google_protobuf_ServiceDescriptorProto, options), 1, UPB_NOT_IN_ONEOF, 1, 11, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_ServiceDescriptorProto_msginit = {
+  &google_protobuf_ServiceDescriptorProto_submsgs[0],
+  &google_protobuf_ServiceDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_ServiceDescriptorProto), 3, 0, false, true
+};
+
+google_protobuf_ServiceDescriptorProto *google_protobuf_ServiceDescriptorProto_new(upb_env *env) {
+  google_protobuf_ServiceDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_ServiceDescriptorProto *google_protobuf_ServiceDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_ServiceDescriptorProto *msg = google_protobuf_ServiceDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_ServiceDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_ServiceDescriptorProto_serialize(google_protobuf_ServiceDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_ServiceDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_ServiceDescriptorProto_name(const google_protobuf_ServiceDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_ServiceDescriptorProto_set_name(google_protobuf_ServiceDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+const upb_array* google_protobuf_ServiceDescriptorProto_method(const google_protobuf_ServiceDescriptorProto *msg) {
+  return msg->method;
+}
+void google_protobuf_ServiceDescriptorProto_set_method(google_protobuf_ServiceDescriptorProto *msg, upb_array* value) {
+  msg->method = value;
+}
+const google_protobuf_ServiceOptions* google_protobuf_ServiceDescriptorProto_options(const google_protobuf_ServiceDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_ServiceDescriptorProto_set_options(google_protobuf_ServiceDescriptorProto *msg, google_protobuf_ServiceOptions* value) {
+  msg->options = value;
+}
+struct google_protobuf_MethodDescriptorProto {
+  bool client_streaming;
+  bool server_streaming;
+  upb_stringview name;
+  upb_stringview input_type;
+  upb_stringview output_type;
+  google_protobuf_MethodOptions* options;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_MethodDescriptorProto_submsgs[1] = {
+  &google_protobuf_MethodOptions_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_MethodDescriptorProto__fields[6] = {
+  {1, offsetof(google_protobuf_MethodDescriptorProto, name), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {2, offsetof(google_protobuf_MethodDescriptorProto, input_type), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {3, offsetof(google_protobuf_MethodDescriptorProto, output_type), 4, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {4, offsetof(google_protobuf_MethodDescriptorProto, options), 5, UPB_NOT_IN_ONEOF, 0, 11, 1},
+  {5, offsetof(google_protobuf_MethodDescriptorProto, client_streaming), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {6, offsetof(google_protobuf_MethodDescriptorProto, server_streaming), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_MethodDescriptorProto_msginit = {
+  &google_protobuf_MethodDescriptorProto_submsgs[0],
+  &google_protobuf_MethodDescriptorProto__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_MethodDescriptorProto), 6, 0, false, true
+};
+
+google_protobuf_MethodDescriptorProto *google_protobuf_MethodDescriptorProto_new(upb_env *env) {
+  google_protobuf_MethodDescriptorProto *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_MethodDescriptorProto *google_protobuf_MethodDescriptorProto_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_MethodDescriptorProto *msg = google_protobuf_MethodDescriptorProto_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_MethodDescriptorProto_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_MethodDescriptorProto_serialize(google_protobuf_MethodDescriptorProto *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_MethodDescriptorProto_msginit, env, size);
+}
+upb_stringview google_protobuf_MethodDescriptorProto_name(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->name;
+}
+void google_protobuf_MethodDescriptorProto_set_name(google_protobuf_MethodDescriptorProto *msg, upb_stringview value) {
+  msg->name = value;
+}
+upb_stringview google_protobuf_MethodDescriptorProto_input_type(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->input_type;
+}
+void google_protobuf_MethodDescriptorProto_set_input_type(google_protobuf_MethodDescriptorProto *msg, upb_stringview value) {
+  msg->input_type = value;
+}
+upb_stringview google_protobuf_MethodDescriptorProto_output_type(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->output_type;
+}
+void google_protobuf_MethodDescriptorProto_set_output_type(google_protobuf_MethodDescriptorProto *msg, upb_stringview value) {
+  msg->output_type = value;
+}
+const google_protobuf_MethodOptions* google_protobuf_MethodDescriptorProto_options(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->options;
+}
+void google_protobuf_MethodDescriptorProto_set_options(google_protobuf_MethodDescriptorProto *msg, google_protobuf_MethodOptions* value) {
+  msg->options = value;
+}
+bool google_protobuf_MethodDescriptorProto_client_streaming(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->client_streaming;
+}
+void google_protobuf_MethodDescriptorProto_set_client_streaming(google_protobuf_MethodDescriptorProto *msg, bool value) {
+  msg->client_streaming = value;
+}
+bool google_protobuf_MethodDescriptorProto_server_streaming(const google_protobuf_MethodDescriptorProto *msg) {
+  return msg->server_streaming;
+}
+void google_protobuf_MethodDescriptorProto_set_server_streaming(google_protobuf_MethodDescriptorProto *msg, bool value) {
+  msg->server_streaming = value;
+}
+struct google_protobuf_FileOptions {
+  google_protobuf_FileOptions_OptimizeMode optimize_for;
+  bool java_multiple_files;
+  bool cc_generic_services;
+  bool java_generic_services;
+  bool py_generic_services;
+  bool java_generate_equals_and_hash;
+  bool deprecated;
+  bool java_string_check_utf8;
+  bool cc_enable_arenas;
+  bool php_generic_services;
+  upb_stringview java_package;
+  upb_stringview java_outer_classname;
+  upb_stringview go_package;
+  upb_stringview objc_class_prefix;
+  upb_stringview csharp_namespace;
+  upb_stringview swift_prefix;
+  upb_stringview php_class_prefix;
+  upb_stringview php_namespace;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_FileOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_FileOptions__fields[19] = {
+  {1, offsetof(google_protobuf_FileOptions, java_package), 10, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {8, offsetof(google_protobuf_FileOptions, java_outer_classname), 11, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {9, offsetof(google_protobuf_FileOptions, optimize_for), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {10, offsetof(google_protobuf_FileOptions, java_multiple_files), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {11, offsetof(google_protobuf_FileOptions, go_package), 12, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {16, offsetof(google_protobuf_FileOptions, cc_generic_services), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {17, offsetof(google_protobuf_FileOptions, java_generic_services), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {18, offsetof(google_protobuf_FileOptions, py_generic_services), 4, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {20, offsetof(google_protobuf_FileOptions, java_generate_equals_and_hash), 5, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {23, offsetof(google_protobuf_FileOptions, deprecated), 6, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {27, offsetof(google_protobuf_FileOptions, java_string_check_utf8), 7, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {31, offsetof(google_protobuf_FileOptions, cc_enable_arenas), 8, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {36, offsetof(google_protobuf_FileOptions, objc_class_prefix), 13, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {37, offsetof(google_protobuf_FileOptions, csharp_namespace), 14, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {39, offsetof(google_protobuf_FileOptions, swift_prefix), 15, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {40, offsetof(google_protobuf_FileOptions, php_class_prefix), 16, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {41, offsetof(google_protobuf_FileOptions, php_namespace), 17, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {42, offsetof(google_protobuf_FileOptions, php_generic_services), 9, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_FileOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_FileOptions_msginit = {
+  &google_protobuf_FileOptions_submsgs[0],
+  &google_protobuf_FileOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_FileOptions), 19, 0, false, true
+};
+
+google_protobuf_FileOptions *google_protobuf_FileOptions_new(upb_env *env) {
+  google_protobuf_FileOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_FileOptions *google_protobuf_FileOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_FileOptions *msg = google_protobuf_FileOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_FileOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_FileOptions_serialize(google_protobuf_FileOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_FileOptions_msginit, env, size);
+}
+upb_stringview google_protobuf_FileOptions_java_package(const google_protobuf_FileOptions *msg) {
+  return msg->java_package;
+}
+void google_protobuf_FileOptions_set_java_package(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->java_package = value;
+}
+upb_stringview google_protobuf_FileOptions_java_outer_classname(const google_protobuf_FileOptions *msg) {
+  return msg->java_outer_classname;
+}
+void google_protobuf_FileOptions_set_java_outer_classname(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->java_outer_classname = value;
+}
+google_protobuf_FileOptions_OptimizeMode google_protobuf_FileOptions_optimize_for(const google_protobuf_FileOptions *msg) {
+  return msg->optimize_for;
+}
+void google_protobuf_FileOptions_set_optimize_for(google_protobuf_FileOptions *msg, google_protobuf_FileOptions_OptimizeMode value) {
+  msg->optimize_for = value;
+}
+bool google_protobuf_FileOptions_java_multiple_files(const google_protobuf_FileOptions *msg) {
+  return msg->java_multiple_files;
+}
+void google_protobuf_FileOptions_set_java_multiple_files(google_protobuf_FileOptions *msg, bool value) {
+  msg->java_multiple_files = value;
+}
+upb_stringview google_protobuf_FileOptions_go_package(const google_protobuf_FileOptions *msg) {
+  return msg->go_package;
+}
+void google_protobuf_FileOptions_set_go_package(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->go_package = value;
+}
+bool google_protobuf_FileOptions_cc_generic_services(const google_protobuf_FileOptions *msg) {
+  return msg->cc_generic_services;
+}
+void google_protobuf_FileOptions_set_cc_generic_services(google_protobuf_FileOptions *msg, bool value) {
+  msg->cc_generic_services = value;
+}
+bool google_protobuf_FileOptions_java_generic_services(const google_protobuf_FileOptions *msg) {
+  return msg->java_generic_services;
+}
+void google_protobuf_FileOptions_set_java_generic_services(google_protobuf_FileOptions *msg, bool value) {
+  msg->java_generic_services = value;
+}
+bool google_protobuf_FileOptions_py_generic_services(const google_protobuf_FileOptions *msg) {
+  return msg->py_generic_services;
+}
+void google_protobuf_FileOptions_set_py_generic_services(google_protobuf_FileOptions *msg, bool value) {
+  msg->py_generic_services = value;
+}
+bool google_protobuf_FileOptions_java_generate_equals_and_hash(const google_protobuf_FileOptions *msg) {
+  return msg->java_generate_equals_and_hash;
+}
+void google_protobuf_FileOptions_set_java_generate_equals_and_hash(google_protobuf_FileOptions *msg, bool value) {
+  msg->java_generate_equals_and_hash = value;
+}
+bool google_protobuf_FileOptions_deprecated(const google_protobuf_FileOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_FileOptions_set_deprecated(google_protobuf_FileOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+bool google_protobuf_FileOptions_java_string_check_utf8(const google_protobuf_FileOptions *msg) {
+  return msg->java_string_check_utf8;
+}
+void google_protobuf_FileOptions_set_java_string_check_utf8(google_protobuf_FileOptions *msg, bool value) {
+  msg->java_string_check_utf8 = value;
+}
+bool google_protobuf_FileOptions_cc_enable_arenas(const google_protobuf_FileOptions *msg) {
+  return msg->cc_enable_arenas;
+}
+void google_protobuf_FileOptions_set_cc_enable_arenas(google_protobuf_FileOptions *msg, bool value) {
+  msg->cc_enable_arenas = value;
+}
+upb_stringview google_protobuf_FileOptions_objc_class_prefix(const google_protobuf_FileOptions *msg) {
+  return msg->objc_class_prefix;
+}
+void google_protobuf_FileOptions_set_objc_class_prefix(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->objc_class_prefix = value;
+}
+upb_stringview google_protobuf_FileOptions_csharp_namespace(const google_protobuf_FileOptions *msg) {
+  return msg->csharp_namespace;
+}
+void google_protobuf_FileOptions_set_csharp_namespace(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->csharp_namespace = value;
+}
+upb_stringview google_protobuf_FileOptions_swift_prefix(const google_protobuf_FileOptions *msg) {
+  return msg->swift_prefix;
+}
+void google_protobuf_FileOptions_set_swift_prefix(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->swift_prefix = value;
+}
+upb_stringview google_protobuf_FileOptions_php_class_prefix(const google_protobuf_FileOptions *msg) {
+  return msg->php_class_prefix;
+}
+void google_protobuf_FileOptions_set_php_class_prefix(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->php_class_prefix = value;
+}
+upb_stringview google_protobuf_FileOptions_php_namespace(const google_protobuf_FileOptions *msg) {
+  return msg->php_namespace;
+}
+void google_protobuf_FileOptions_set_php_namespace(google_protobuf_FileOptions *msg, upb_stringview value) {
+  msg->php_namespace = value;
+}
+bool google_protobuf_FileOptions_php_generic_services(const google_protobuf_FileOptions *msg) {
+  return msg->php_generic_services;
+}
+void google_protobuf_FileOptions_set_php_generic_services(google_protobuf_FileOptions *msg, bool value) {
+  msg->php_generic_services = value;
+}
+const upb_array* google_protobuf_FileOptions_uninterpreted_option(const google_protobuf_FileOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_FileOptions_set_uninterpreted_option(google_protobuf_FileOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_MessageOptions {
+  bool message_set_wire_format;
+  bool no_standard_descriptor_accessor;
+  bool deprecated;
+  bool map_entry;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_MessageOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_MessageOptions__fields[5] = {
+  {1, offsetof(google_protobuf_MessageOptions, message_set_wire_format), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {2, offsetof(google_protobuf_MessageOptions, no_standard_descriptor_accessor), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {3, offsetof(google_protobuf_MessageOptions, deprecated), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {7, offsetof(google_protobuf_MessageOptions, map_entry), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_MessageOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_MessageOptions_msginit = {
+  &google_protobuf_MessageOptions_submsgs[0],
+  &google_protobuf_MessageOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_MessageOptions), 5, 0, false, true
+};
+
+google_protobuf_MessageOptions *google_protobuf_MessageOptions_new(upb_env *env) {
+  google_protobuf_MessageOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_MessageOptions *google_protobuf_MessageOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_MessageOptions *msg = google_protobuf_MessageOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_MessageOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_MessageOptions_serialize(google_protobuf_MessageOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_MessageOptions_msginit, env, size);
+}
+bool google_protobuf_MessageOptions_message_set_wire_format(const google_protobuf_MessageOptions *msg) {
+  return msg->message_set_wire_format;
+}
+void google_protobuf_MessageOptions_set_message_set_wire_format(google_protobuf_MessageOptions *msg, bool value) {
+  msg->message_set_wire_format = value;
+}
+bool google_protobuf_MessageOptions_no_standard_descriptor_accessor(const google_protobuf_MessageOptions *msg) {
+  return msg->no_standard_descriptor_accessor;
+}
+void google_protobuf_MessageOptions_set_no_standard_descriptor_accessor(google_protobuf_MessageOptions *msg, bool value) {
+  msg->no_standard_descriptor_accessor = value;
+}
+bool google_protobuf_MessageOptions_deprecated(const google_protobuf_MessageOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_MessageOptions_set_deprecated(google_protobuf_MessageOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+bool google_protobuf_MessageOptions_map_entry(const google_protobuf_MessageOptions *msg) {
+  return msg->map_entry;
+}
+void google_protobuf_MessageOptions_set_map_entry(google_protobuf_MessageOptions *msg, bool value) {
+  msg->map_entry = value;
+}
+const upb_array* google_protobuf_MessageOptions_uninterpreted_option(const google_protobuf_MessageOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_MessageOptions_set_uninterpreted_option(google_protobuf_MessageOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_FieldOptions {
+  google_protobuf_FieldOptions_CType ctype;
+  google_protobuf_FieldOptions_JSType jstype;
+  bool packed;
+  bool deprecated;
+  bool lazy;
+  bool weak;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_FieldOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_FieldOptions__fields[7] = {
+  {1, offsetof(google_protobuf_FieldOptions, ctype), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {2, offsetof(google_protobuf_FieldOptions, packed), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {3, offsetof(google_protobuf_FieldOptions, deprecated), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {5, offsetof(google_protobuf_FieldOptions, lazy), 4, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {6, offsetof(google_protobuf_FieldOptions, jstype), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {10, offsetof(google_protobuf_FieldOptions, weak), 5, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_FieldOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_FieldOptions_msginit = {
+  &google_protobuf_FieldOptions_submsgs[0],
+  &google_protobuf_FieldOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_FieldOptions), 7, 0, false, true
+};
+
+google_protobuf_FieldOptions *google_protobuf_FieldOptions_new(upb_env *env) {
+  google_protobuf_FieldOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_FieldOptions *google_protobuf_FieldOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_FieldOptions *msg = google_protobuf_FieldOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_FieldOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_FieldOptions_serialize(google_protobuf_FieldOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_FieldOptions_msginit, env, size);
+}
+google_protobuf_FieldOptions_CType google_protobuf_FieldOptions_ctype(const google_protobuf_FieldOptions *msg) {
+  return msg->ctype;
+}
+void google_protobuf_FieldOptions_set_ctype(google_protobuf_FieldOptions *msg, google_protobuf_FieldOptions_CType value) {
+  msg->ctype = value;
+}
+bool google_protobuf_FieldOptions_packed(const google_protobuf_FieldOptions *msg) {
+  return msg->packed;
+}
+void google_protobuf_FieldOptions_set_packed(google_protobuf_FieldOptions *msg, bool value) {
+  msg->packed = value;
+}
+bool google_protobuf_FieldOptions_deprecated(const google_protobuf_FieldOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_FieldOptions_set_deprecated(google_protobuf_FieldOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+bool google_protobuf_FieldOptions_lazy(const google_protobuf_FieldOptions *msg) {
+  return msg->lazy;
+}
+void google_protobuf_FieldOptions_set_lazy(google_protobuf_FieldOptions *msg, bool value) {
+  msg->lazy = value;
+}
+google_protobuf_FieldOptions_JSType google_protobuf_FieldOptions_jstype(const google_protobuf_FieldOptions *msg) {
+  return msg->jstype;
+}
+void google_protobuf_FieldOptions_set_jstype(google_protobuf_FieldOptions *msg, google_protobuf_FieldOptions_JSType value) {
+  msg->jstype = value;
+}
+bool google_protobuf_FieldOptions_weak(const google_protobuf_FieldOptions *msg) {
+  return msg->weak;
+}
+void google_protobuf_FieldOptions_set_weak(google_protobuf_FieldOptions *msg, bool value) {
+  msg->weak = value;
+}
+const upb_array* google_protobuf_FieldOptions_uninterpreted_option(const google_protobuf_FieldOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_FieldOptions_set_uninterpreted_option(google_protobuf_FieldOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_OneofOptions {
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_OneofOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_OneofOptions__fields[1] = {
+  {999, offsetof(google_protobuf_OneofOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_OneofOptions_msginit = {
+  &google_protobuf_OneofOptions_submsgs[0],
+  &google_protobuf_OneofOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_OneofOptions), 1, 0, false, true
+};
+
+google_protobuf_OneofOptions *google_protobuf_OneofOptions_new(upb_env *env) {
+  google_protobuf_OneofOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_OneofOptions *google_protobuf_OneofOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_OneofOptions *msg = google_protobuf_OneofOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_OneofOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_OneofOptions_serialize(google_protobuf_OneofOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_OneofOptions_msginit, env, size);
+}
+const upb_array* google_protobuf_OneofOptions_uninterpreted_option(const google_protobuf_OneofOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_OneofOptions_set_uninterpreted_option(google_protobuf_OneofOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_EnumOptions {
+  bool allow_alias;
+  bool deprecated;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_EnumOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_EnumOptions__fields[3] = {
+  {2, offsetof(google_protobuf_EnumOptions, allow_alias), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {3, offsetof(google_protobuf_EnumOptions, deprecated), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_EnumOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_EnumOptions_msginit = {
+  &google_protobuf_EnumOptions_submsgs[0],
+  &google_protobuf_EnumOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_EnumOptions), 3, 0, false, true
+};
+
+google_protobuf_EnumOptions *google_protobuf_EnumOptions_new(upb_env *env) {
+  google_protobuf_EnumOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_EnumOptions *google_protobuf_EnumOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_EnumOptions *msg = google_protobuf_EnumOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_EnumOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_EnumOptions_serialize(google_protobuf_EnumOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_EnumOptions_msginit, env, size);
+}
+bool google_protobuf_EnumOptions_allow_alias(const google_protobuf_EnumOptions *msg) {
+  return msg->allow_alias;
+}
+void google_protobuf_EnumOptions_set_allow_alias(google_protobuf_EnumOptions *msg, bool value) {
+  msg->allow_alias = value;
+}
+bool google_protobuf_EnumOptions_deprecated(const google_protobuf_EnumOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_EnumOptions_set_deprecated(google_protobuf_EnumOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+const upb_array* google_protobuf_EnumOptions_uninterpreted_option(const google_protobuf_EnumOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_EnumOptions_set_uninterpreted_option(google_protobuf_EnumOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_EnumValueOptions {
+  bool deprecated;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_EnumValueOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_EnumValueOptions__fields[2] = {
+  {1, offsetof(google_protobuf_EnumValueOptions, deprecated), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_EnumValueOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_EnumValueOptions_msginit = {
+  &google_protobuf_EnumValueOptions_submsgs[0],
+  &google_protobuf_EnumValueOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_EnumValueOptions), 2, 0, false, true
+};
+
+google_protobuf_EnumValueOptions *google_protobuf_EnumValueOptions_new(upb_env *env) {
+  google_protobuf_EnumValueOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_EnumValueOptions *google_protobuf_EnumValueOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_EnumValueOptions *msg = google_protobuf_EnumValueOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_EnumValueOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_EnumValueOptions_serialize(google_protobuf_EnumValueOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_EnumValueOptions_msginit, env, size);
+}
+bool google_protobuf_EnumValueOptions_deprecated(const google_protobuf_EnumValueOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_EnumValueOptions_set_deprecated(google_protobuf_EnumValueOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+const upb_array* google_protobuf_EnumValueOptions_uninterpreted_option(const google_protobuf_EnumValueOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_EnumValueOptions_set_uninterpreted_option(google_protobuf_EnumValueOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_ServiceOptions {
+  bool deprecated;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_ServiceOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_ServiceOptions__fields[2] = {
+  {33, offsetof(google_protobuf_ServiceOptions, deprecated), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {999, offsetof(google_protobuf_ServiceOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_ServiceOptions_msginit = {
+  &google_protobuf_ServiceOptions_submsgs[0],
+  &google_protobuf_ServiceOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_ServiceOptions), 2, 0, false, true
+};
+
+google_protobuf_ServiceOptions *google_protobuf_ServiceOptions_new(upb_env *env) {
+  google_protobuf_ServiceOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_ServiceOptions *google_protobuf_ServiceOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_ServiceOptions *msg = google_protobuf_ServiceOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_ServiceOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_ServiceOptions_serialize(google_protobuf_ServiceOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_ServiceOptions_msginit, env, size);
+}
+bool google_protobuf_ServiceOptions_deprecated(const google_protobuf_ServiceOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_ServiceOptions_set_deprecated(google_protobuf_ServiceOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+const upb_array* google_protobuf_ServiceOptions_uninterpreted_option(const google_protobuf_ServiceOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_ServiceOptions_set_uninterpreted_option(google_protobuf_ServiceOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_MethodOptions {
+  google_protobuf_MethodOptions_IdempotencyLevel idempotency_level;
+  bool deprecated;
+  upb_array* uninterpreted_option;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_MethodOptions_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_MethodOptions__fields[3] = {
+  {33, offsetof(google_protobuf_MethodOptions, deprecated), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 1},
+  {34, offsetof(google_protobuf_MethodOptions, idempotency_level), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 14, 1},
+  {999, offsetof(google_protobuf_MethodOptions, uninterpreted_option), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_MethodOptions_msginit = {
+  &google_protobuf_MethodOptions_submsgs[0],
+  &google_protobuf_MethodOptions__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_MethodOptions), 3, 0, false, true
+};
+
+google_protobuf_MethodOptions *google_protobuf_MethodOptions_new(upb_env *env) {
+  google_protobuf_MethodOptions *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_MethodOptions *google_protobuf_MethodOptions_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_MethodOptions *msg = google_protobuf_MethodOptions_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_MethodOptions_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_MethodOptions_serialize(google_protobuf_MethodOptions *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_MethodOptions_msginit, env, size);
+}
+bool google_protobuf_MethodOptions_deprecated(const google_protobuf_MethodOptions *msg) {
+  return msg->deprecated;
+}
+void google_protobuf_MethodOptions_set_deprecated(google_protobuf_MethodOptions *msg, bool value) {
+  msg->deprecated = value;
+}
+google_protobuf_MethodOptions_IdempotencyLevel google_protobuf_MethodOptions_idempotency_level(const google_protobuf_MethodOptions *msg) {
+  return msg->idempotency_level;
+}
+void google_protobuf_MethodOptions_set_idempotency_level(google_protobuf_MethodOptions *msg, google_protobuf_MethodOptions_IdempotencyLevel value) {
+  msg->idempotency_level = value;
+}
+const upb_array* google_protobuf_MethodOptions_uninterpreted_option(const google_protobuf_MethodOptions *msg) {
+  return msg->uninterpreted_option;
+}
+void google_protobuf_MethodOptions_set_uninterpreted_option(google_protobuf_MethodOptions *msg, upb_array* value) {
+  msg->uninterpreted_option = value;
+}
+struct google_protobuf_UninterpretedOption {
+  uint64_t positive_int_value;
+  int64_t negative_int_value;
+  double double_value;
+  upb_stringview identifier_value;
+  upb_stringview string_value;
+  upb_stringview aggregate_value;
+  upb_array* name;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_UninterpretedOption_submsgs[1] = {
+  &google_protobuf_UninterpretedOption_NamePart_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_UninterpretedOption__fields[7] = {
+  {2, offsetof(google_protobuf_UninterpretedOption, name), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+  {3, offsetof(google_protobuf_UninterpretedOption, identifier_value), 3, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {4, offsetof(google_protobuf_UninterpretedOption, positive_int_value), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 4, 1},
+  {5, offsetof(google_protobuf_UninterpretedOption, negative_int_value), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 3, 1},
+  {6, offsetof(google_protobuf_UninterpretedOption, double_value), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 1, 1},
+  {7, offsetof(google_protobuf_UninterpretedOption, string_value), 4, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 12, 1},
+  {8, offsetof(google_protobuf_UninterpretedOption, aggregate_value), 5, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_UninterpretedOption_msginit = {
+  &google_protobuf_UninterpretedOption_submsgs[0],
+  &google_protobuf_UninterpretedOption__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_UninterpretedOption), 7, 0, false, true
+};
+
+google_protobuf_UninterpretedOption *google_protobuf_UninterpretedOption_new(upb_env *env) {
+  google_protobuf_UninterpretedOption *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_UninterpretedOption *google_protobuf_UninterpretedOption_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_UninterpretedOption *msg = google_protobuf_UninterpretedOption_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_UninterpretedOption_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_UninterpretedOption_serialize(google_protobuf_UninterpretedOption *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_UninterpretedOption_msginit, env, size);
+}
+const upb_array* google_protobuf_UninterpretedOption_name(const google_protobuf_UninterpretedOption *msg) {
+  return msg->name;
+}
+void google_protobuf_UninterpretedOption_set_name(google_protobuf_UninterpretedOption *msg, upb_array* value) {
+  msg->name = value;
+}
+upb_stringview google_protobuf_UninterpretedOption_identifier_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->identifier_value;
+}
+void google_protobuf_UninterpretedOption_set_identifier_value(google_protobuf_UninterpretedOption *msg, upb_stringview value) {
+  msg->identifier_value = value;
+}
+uint64_t google_protobuf_UninterpretedOption_positive_int_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->positive_int_value;
+}
+void google_protobuf_UninterpretedOption_set_positive_int_value(google_protobuf_UninterpretedOption *msg, uint64_t value) {
+  msg->positive_int_value = value;
+}
+int64_t google_protobuf_UninterpretedOption_negative_int_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->negative_int_value;
+}
+void google_protobuf_UninterpretedOption_set_negative_int_value(google_protobuf_UninterpretedOption *msg, int64_t value) {
+  msg->negative_int_value = value;
+}
+double google_protobuf_UninterpretedOption_double_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->double_value;
+}
+void google_protobuf_UninterpretedOption_set_double_value(google_protobuf_UninterpretedOption *msg, double value) {
+  msg->double_value = value;
+}
+upb_stringview google_protobuf_UninterpretedOption_string_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->string_value;
+}
+void google_protobuf_UninterpretedOption_set_string_value(google_protobuf_UninterpretedOption *msg, upb_stringview value) {
+  msg->string_value = value;
+}
+upb_stringview google_protobuf_UninterpretedOption_aggregate_value(const google_protobuf_UninterpretedOption *msg) {
+  return msg->aggregate_value;
+}
+void google_protobuf_UninterpretedOption_set_aggregate_value(google_protobuf_UninterpretedOption *msg, upb_stringview value) {
+  msg->aggregate_value = value;
+}
+struct google_protobuf_UninterpretedOption_NamePart {
+  bool is_extension;
+  upb_stringview name_part;
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_UninterpretedOption_NamePart__fields[2] = {
+  {1, offsetof(google_protobuf_UninterpretedOption_NamePart, name_part), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 2},
+  {2, offsetof(google_protobuf_UninterpretedOption_NamePart, is_extension), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 8, 2},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_UninterpretedOption_NamePart_msginit = {
+  NULL,
+  &google_protobuf_UninterpretedOption_NamePart__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_UninterpretedOption_NamePart), 2, 0, false, true
+};
+
+google_protobuf_UninterpretedOption_NamePart *google_protobuf_UninterpretedOption_NamePart_new(upb_env *env) {
+  google_protobuf_UninterpretedOption_NamePart *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_UninterpretedOption_NamePart *google_protobuf_UninterpretedOption_NamePart_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_UninterpretedOption_NamePart *msg = google_protobuf_UninterpretedOption_NamePart_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_UninterpretedOption_NamePart_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_UninterpretedOption_NamePart_serialize(google_protobuf_UninterpretedOption_NamePart *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_UninterpretedOption_NamePart_msginit, env, size);
+}
+upb_stringview google_protobuf_UninterpretedOption_NamePart_name_part(const google_protobuf_UninterpretedOption_NamePart *msg) {
+  return msg->name_part;
+}
+void google_protobuf_UninterpretedOption_NamePart_set_name_part(google_protobuf_UninterpretedOption_NamePart *msg, upb_stringview value) {
+  msg->name_part = value;
+}
+bool google_protobuf_UninterpretedOption_NamePart_is_extension(const google_protobuf_UninterpretedOption_NamePart *msg) {
+  return msg->is_extension;
+}
+void google_protobuf_UninterpretedOption_NamePart_set_is_extension(google_protobuf_UninterpretedOption_NamePart *msg, bool value) {
+  msg->is_extension = value;
+}
+struct google_protobuf_SourceCodeInfo {
+  upb_array* location;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_SourceCodeInfo_submsgs[1] = {
+  &google_protobuf_SourceCodeInfo_Location_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_SourceCodeInfo__fields[1] = {
+  {1, offsetof(google_protobuf_SourceCodeInfo, location), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_SourceCodeInfo_msginit = {
+  &google_protobuf_SourceCodeInfo_submsgs[0],
+  &google_protobuf_SourceCodeInfo__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_SourceCodeInfo), 1, 0, false, true
+};
+
+google_protobuf_SourceCodeInfo *google_protobuf_SourceCodeInfo_new(upb_env *env) {
+  google_protobuf_SourceCodeInfo *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_SourceCodeInfo *google_protobuf_SourceCodeInfo_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_SourceCodeInfo *msg = google_protobuf_SourceCodeInfo_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_SourceCodeInfo_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_SourceCodeInfo_serialize(google_protobuf_SourceCodeInfo *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_SourceCodeInfo_msginit, env, size);
+}
+const upb_array* google_protobuf_SourceCodeInfo_location(const google_protobuf_SourceCodeInfo *msg) {
+  return msg->location;
+}
+void google_protobuf_SourceCodeInfo_set_location(google_protobuf_SourceCodeInfo *msg, upb_array* value) {
+  msg->location = value;
+}
+struct google_protobuf_SourceCodeInfo_Location {
+  upb_stringview leading_comments;
+  upb_stringview trailing_comments;
+  upb_array* path;
+  upb_array* span;
+  upb_array* leading_detached_comments;
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_SourceCodeInfo_Location__fields[5] = {
+  {1, offsetof(google_protobuf_SourceCodeInfo_Location, path), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 3},
+  {2, offsetof(google_protobuf_SourceCodeInfo_Location, span), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 3},
+  {3, offsetof(google_protobuf_SourceCodeInfo_Location, leading_comments), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {4, offsetof(google_protobuf_SourceCodeInfo_Location, trailing_comments), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {6, offsetof(google_protobuf_SourceCodeInfo_Location, leading_detached_comments), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_SourceCodeInfo_Location_msginit = {
+  NULL,
+  &google_protobuf_SourceCodeInfo_Location__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_SourceCodeInfo_Location), 5, 0, false, true
+};
+
+google_protobuf_SourceCodeInfo_Location *google_protobuf_SourceCodeInfo_Location_new(upb_env *env) {
+  google_protobuf_SourceCodeInfo_Location *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_SourceCodeInfo_Location *google_protobuf_SourceCodeInfo_Location_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_SourceCodeInfo_Location *msg = google_protobuf_SourceCodeInfo_Location_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_SourceCodeInfo_Location_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_SourceCodeInfo_Location_serialize(google_protobuf_SourceCodeInfo_Location *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_SourceCodeInfo_Location_msginit, env, size);
+}
+const upb_array* google_protobuf_SourceCodeInfo_Location_path(const google_protobuf_SourceCodeInfo_Location *msg) {
+  return msg->path;
+}
+void google_protobuf_SourceCodeInfo_Location_set_path(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value) {
+  msg->path = value;
+}
+const upb_array* google_protobuf_SourceCodeInfo_Location_span(const google_protobuf_SourceCodeInfo_Location *msg) {
+  return msg->span;
+}
+void google_protobuf_SourceCodeInfo_Location_set_span(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value) {
+  msg->span = value;
+}
+upb_stringview google_protobuf_SourceCodeInfo_Location_leading_comments(const google_protobuf_SourceCodeInfo_Location *msg) {
+  return msg->leading_comments;
+}
+void google_protobuf_SourceCodeInfo_Location_set_leading_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_stringview value) {
+  msg->leading_comments = value;
+}
+upb_stringview google_protobuf_SourceCodeInfo_Location_trailing_comments(const google_protobuf_SourceCodeInfo_Location *msg) {
+  return msg->trailing_comments;
+}
+void google_protobuf_SourceCodeInfo_Location_set_trailing_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_stringview value) {
+  msg->trailing_comments = value;
+}
+const upb_array* google_protobuf_SourceCodeInfo_Location_leading_detached_comments(const google_protobuf_SourceCodeInfo_Location *msg) {
+  return msg->leading_detached_comments;
+}
+void google_protobuf_SourceCodeInfo_Location_set_leading_detached_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value) {
+  msg->leading_detached_comments = value;
+}
+struct google_protobuf_GeneratedCodeInfo {
+  upb_array* annotation;
+};
+
+static const upb_msglayout_msginit_v1 *const google_protobuf_GeneratedCodeInfo_submsgs[1] = {
+  &google_protobuf_GeneratedCodeInfo_Annotation_msginit,
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_GeneratedCodeInfo__fields[1] = {
+  {1, offsetof(google_protobuf_GeneratedCodeInfo, annotation), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, 0, 11, 3},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_GeneratedCodeInfo_msginit = {
+  &google_protobuf_GeneratedCodeInfo_submsgs[0],
+  &google_protobuf_GeneratedCodeInfo__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_GeneratedCodeInfo), 1, 0, false, true
+};
+
+google_protobuf_GeneratedCodeInfo *google_protobuf_GeneratedCodeInfo_new(upb_env *env) {
+  google_protobuf_GeneratedCodeInfo *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_GeneratedCodeInfo *google_protobuf_GeneratedCodeInfo_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_GeneratedCodeInfo *msg = google_protobuf_GeneratedCodeInfo_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_GeneratedCodeInfo_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_GeneratedCodeInfo_serialize(google_protobuf_GeneratedCodeInfo *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_GeneratedCodeInfo_msginit, env, size);
+}
+const upb_array* google_protobuf_GeneratedCodeInfo_annotation(const google_protobuf_GeneratedCodeInfo *msg) {
+  return msg->annotation;
+}
+void google_protobuf_GeneratedCodeInfo_set_annotation(google_protobuf_GeneratedCodeInfo *msg, upb_array* value) {
+  msg->annotation = value;
+}
+struct google_protobuf_GeneratedCodeInfo_Annotation {
+  int32_t begin;
+  int32_t end;
+  upb_stringview source_file;
+  upb_array* path;
+};
+
+static const upb_msglayout_fieldinit_v1 google_protobuf_GeneratedCodeInfo_Annotation__fields[4] = {
+  {1, offsetof(google_protobuf_GeneratedCodeInfo_Annotation, path), UPB_NO_HASBIT, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 3},
+  {2, offsetof(google_protobuf_GeneratedCodeInfo_Annotation, source_file), 2, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 9, 1},
+  {3, offsetof(google_protobuf_GeneratedCodeInfo_Annotation, begin), 0, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+  {4, offsetof(google_protobuf_GeneratedCodeInfo_Annotation, end), 1, UPB_NOT_IN_ONEOF, UPB_NO_SUBMSG, 5, 1},
+};
+
+const upb_msglayout_msginit_v1 google_protobuf_GeneratedCodeInfo_Annotation_msginit = {
+  NULL,
+  &google_protobuf_GeneratedCodeInfo_Annotation__fields[0],
+  NULL,
+  NULL, /* TODO. default_msg */
+  UPB_ALIGNED_SIZEOF(google_protobuf_GeneratedCodeInfo_Annotation), 4, 0, false, true
+};
+
+google_protobuf_GeneratedCodeInfo_Annotation *google_protobuf_GeneratedCodeInfo_Annotation_new(upb_env *env) {
+  google_protobuf_GeneratedCodeInfo_Annotation *msg = upb_env_malloc(env, sizeof(*msg));
+  memset(msg, 0, sizeof(*msg));  /* TODO: defaults */
+  return msg;
+}
+google_protobuf_GeneratedCodeInfo_Annotation *google_protobuf_GeneratedCodeInfo_Annotation_parsenew(upb_stringview buf, upb_env *env) {
+  google_protobuf_GeneratedCodeInfo_Annotation *msg = google_protobuf_GeneratedCodeInfo_Annotation_new(env);
+  if (upb_decode(buf, msg, &google_protobuf_GeneratedCodeInfo_Annotation_msginit, env)) {
+    return msg;
+  } else {
+    return NULL;
+  }
+}
+char *google_protobuf_GeneratedCodeInfo_Annotation_serialize(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_env *env, size_t *size) {
+  return upb_encode(msg, &google_protobuf_GeneratedCodeInfo_Annotation_msginit, env, size);
+}
+const upb_array* google_protobuf_GeneratedCodeInfo_Annotation_path(const google_protobuf_GeneratedCodeInfo_Annotation *msg) {
+  return msg->path;
+}
+void google_protobuf_GeneratedCodeInfo_Annotation_set_path(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_array* value) {
+  msg->path = value;
+}
+upb_stringview google_protobuf_GeneratedCodeInfo_Annotation_source_file(const google_protobuf_GeneratedCodeInfo_Annotation *msg) {
+  return msg->source_file;
+}
+void google_protobuf_GeneratedCodeInfo_Annotation_set_source_file(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_stringview value) {
+  msg->source_file = value;
+}
+int32_t google_protobuf_GeneratedCodeInfo_Annotation_begin(const google_protobuf_GeneratedCodeInfo_Annotation *msg) {
+  return msg->begin;
+}
+void google_protobuf_GeneratedCodeInfo_Annotation_set_begin(google_protobuf_GeneratedCodeInfo_Annotation *msg, int32_t value) {
+  msg->begin = value;
+}
+int32_t google_protobuf_GeneratedCodeInfo_Annotation_end(const google_protobuf_GeneratedCodeInfo_Annotation *msg) {
+  return msg->end;
+}
+void google_protobuf_GeneratedCodeInfo_Annotation_set_end(google_protobuf_GeneratedCodeInfo_Annotation *msg, int32_t value) {
+  msg->end = value;
+}
+
+
+/* Maps descriptor type -> upb field type.  */
+const uint8_t upb_desctype_to_fieldtype[] = {
+  UPB_WIRE_TYPE_END_GROUP,  /* ENDGROUP */
+  UPB_TYPE_DOUBLE,          /* DOUBLE */
+  UPB_TYPE_FLOAT,           /* FLOAT */
+  UPB_TYPE_INT64,           /* INT64 */
+  UPB_TYPE_UINT64,          /* UINT64 */
+  UPB_TYPE_INT32,           /* INT32 */
+  UPB_TYPE_UINT64,          /* FIXED64 */
+  UPB_TYPE_UINT32,          /* FIXED32 */
+  UPB_TYPE_BOOL,            /* BOOL */
+  UPB_TYPE_STRING,          /* STRING */
+  UPB_TYPE_MESSAGE,         /* GROUP */
+  UPB_TYPE_MESSAGE,         /* MESSAGE */
+  UPB_TYPE_BYTES,           /* BYTES */
+  UPB_TYPE_UINT32,          /* UINT32 */
+  UPB_TYPE_ENUM,            /* ENUM */
+  UPB_TYPE_INT32,           /* SFIXED32 */
+  UPB_TYPE_INT64,           /* SFIXED64 */
+  UPB_TYPE_INT32,           /* SINT32 */
+  UPB_TYPE_INT64,           /* SINT64 */
+};
+
+/* Data pertaining to the parse. */
+typedef struct {
+  upb_env *env;
+  /* Current decoding pointer.  Points to the beginning of a field until we
+   * have finished decoding the whole field. */
+  const char *ptr;
+} upb_decstate;
+
+/* Data pertaining to a single message frame. */
+typedef struct {
+  const char *limit;
+  int32_t group_number;  /* 0 if we are not parsing a group. */
+
+  /* These members are unset for an unknown group frame. */
+  char *msg;
+  const upb_msglayout_msginit_v1 *m;
+} upb_decframe;
+
+#define CHK(x) if (!(x)) { return false; }
+
+static bool upb_skip_unknowngroup(upb_decstate *d, int field_number,
+                                  const char *limit);
+static bool upb_decode_message(upb_decstate *d, const char *limit,
+                               int group_number, char *msg,
+                               const upb_msglayout_msginit_v1 *l);
+
+static bool upb_decode_varint(const char **ptr, const char *limit,
+                              uint64_t *val) {
+  uint8_t byte;
+  int bitpos = 0;
+  const char *p = *ptr;
+  *val = 0;
+
+  do {
+    CHK(bitpos < 70 && p < limit);
+    byte = *p;
+    *val |= (uint64_t)(byte & 0x7F) << bitpos;
+    p++;
+    bitpos += 7;
+  } while (byte & 0x80);
+
+  *ptr = p;
+  return true;
+}
+
+static bool upb_decode_varint32(const char **ptr, const char *limit,
+                                uint32_t *val) {
+  uint64_t u64;
+  CHK(upb_decode_varint(ptr, limit, &u64) && u64 <= UINT32_MAX);
+  *val = u64;
+  return true;
+}
+
+static bool upb_decode_64bit(const char **ptr, const char *limit,
+                             uint64_t *val) {
+  CHK(limit - *ptr >= 8);
+  memcpy(val, *ptr, 8);
+  *ptr += 8;
+  return true;
+}
+
+static bool upb_decode_32bit(const char **ptr, const char *limit,
+                             uint32_t *val) {
+  CHK(limit - *ptr >= 4);
+  memcpy(val, *ptr, 4);
+  *ptr += 4;
+  return true;
+}
+
+static bool upb_decode_tag(const char **ptr, const char *limit,
+                           int *field_number, int *wire_type) {
+  uint32_t tag = 0;
+  CHK(upb_decode_varint32(ptr, limit, &tag));
+  *field_number = tag >> 3;
+  *wire_type = tag & 7;
+  return true;
+}
+
+static int32_t upb_zzdecode_32(uint32_t n) {
+  return (n >> 1) ^ -(int32_t)(n & 1);
+}
+
+static int64_t upb_zzdecode_64(uint64_t n) {
+  return (n >> 1) ^ -(int64_t)(n & 1);
+}
+
+static bool upb_decode_string(const char **ptr, const char *limit,
+                              upb_stringview *val) {
+  uint32_t len;
+
+  CHK(upb_decode_varint32(ptr, limit, &len) &&
+      len < INT32_MAX &&
+      limit - *ptr >= (int32_t)len);
+
+  *val = upb_stringview_make(*ptr, len);
+  *ptr += len;
+  return true;
+}
+
+static void upb_set32(void *msg, size_t ofs, uint32_t val) {
+  memcpy((char*)msg + ofs, &val, sizeof(val));
+}
+
+static bool upb_append_unknown(upb_decstate *d, upb_decframe *frame,
+                               const char *start) {
+  UPB_UNUSED(d);
+  UPB_UNUSED(frame);
+  UPB_UNUSED(start);
+  return true;
+}
+
+static bool upb_skip_unknownfielddata(upb_decstate *d, upb_decframe *frame,
+                                      int field_number, int wire_type) {
+  switch (wire_type) {
+    case UPB_WIRE_TYPE_VARINT: {
+      uint64_t val;
+      return upb_decode_varint(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_32BIT: {
+      uint32_t val;
+      return upb_decode_32bit(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_64BIT: {
+      uint64_t val;
+      return upb_decode_64bit(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_DELIMITED: {
+      upb_stringview val;
+      return upb_decode_string(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_START_GROUP:
+      return upb_skip_unknowngroup(d, field_number, frame->limit);
+    case UPB_WIRE_TYPE_END_GROUP:
+      CHK(field_number == frame->group_number);
+      frame->limit = d->ptr;
+      return true;
+  }
+  return false;
+}
+
+static bool upb_array_grow(upb_array *arr, size_t elements) {
+  size_t needed = arr->len + elements;
+  size_t new_size = UPB_MAX(arr->size, 8);
+  size_t new_bytes;
+  size_t old_bytes;
+  void *new_data;
+
+  while (new_size < needed) {
+    new_size *= 2;
+  }
+
+  old_bytes = arr->len * arr->element_size;
+  new_bytes = new_size * arr->element_size;
+  new_data = upb_realloc(arr->alloc, arr->data, old_bytes, new_bytes);
+  CHK(new_data);
+
+  arr->data = new_data;
+  arr->size = new_size;
+  return true;
+}
+
+static void *upb_array_reserve(upb_array *arr, size_t elements) {
+  if (arr->size - arr->len < elements) {
+    CHK(upb_array_grow(arr, elements));
+  }
+  return (char*)arr->data + (arr->len * arr->element_size);
+}
+
+static void *upb_array_add(upb_array *arr, size_t elements) {
+  void *ret = upb_array_reserve(arr, elements);
+  arr->len += elements;
+  return ret;
+}
+
+static upb_array *upb_getarr(upb_decframe *frame,
+                             const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->label == UPB_LABEL_REPEATED);
+  return *(upb_array**)&frame->msg[field->offset];
+}
+
+static upb_array *upb_getorcreatearr(upb_decstate *d,
+                                     upb_decframe *frame,
+                                     const upb_msglayout_fieldinit_v1 *field) {
+  upb_array *arr = upb_getarr(frame, field);
+
+  if (!arr) {
+    arr = upb_env_malloc(d->env, sizeof(*arr));
+    if (!arr) {
+      return NULL;
+    }
+    upb_array_init(arr, upb_desctype_to_fieldtype[field->descriptortype],
+                   upb_arena_alloc(upb_env_arena(d->env)));
+    *(upb_array**)&frame->msg[field->offset] = arr;
+  }
+
+  return arr;
+}
+
+static void upb_sethasbit(upb_decframe *frame,
+                          const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->hasbit != UPB_NO_HASBIT);
+  frame->msg[field->hasbit / 8] |= (1 << (field->hasbit % 8));
+}
+
+static void upb_setoneofcase(upb_decframe *frame,
+                             const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->oneof_index != UPB_NOT_IN_ONEOF);
+  upb_set32(frame->msg, frame->m->oneofs[field->oneof_index].case_offset,
+            field->number);
+}
+
+static char *upb_decode_prepareslot(upb_decstate *d,
+                                    upb_decframe *frame,
+                                    const upb_msglayout_fieldinit_v1 *field) {
+  char *field_mem = frame->msg + field->offset;
+  upb_array *arr;
+
+  if (field->label == UPB_LABEL_REPEATED) {
+    arr = upb_getorcreatearr(d, frame, field);
+    field_mem = upb_array_reserve(arr, 1);
+  }
+
+  return field_mem;
+}
+
+static void upb_decode_setpresent(upb_decframe *frame,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  if (field->label == UPB_LABEL_REPEATED) {
+   upb_array *arr = upb_getarr(frame, field);
+   UPB_ASSERT(arr->len < arr->size);
+   arr->len++;
+  } else if (field->oneof_index != UPB_NOT_IN_ONEOF) {
+    upb_setoneofcase(frame, field);
+  } else if (field->hasbit != UPB_NO_HASBIT) {
+    upb_sethasbit(frame, field);
+  }
+}
+
+static bool upb_decode_submsg(upb_decstate *d,
+                              upb_decframe *frame,
+                              const char *limit,
+                              const upb_msglayout_fieldinit_v1 *field,
+                              int group_number) {
+  char *submsg_slot = upb_decode_prepareslot(d, frame, field);
+  char *submsg = *(void**)submsg_slot;
+  const upb_msglayout_msginit_v1 *subm;
+
+  UPB_ASSERT(field->submsg_index != UPB_NO_SUBMSG);
+  subm = frame->m->submsgs[field->submsg_index];
+  UPB_ASSERT(subm);
+
+  if (!submsg) {
+    submsg = upb_env_malloc(d->env, upb_msg_sizeof((upb_msglayout *)subm));
+    CHK(submsg);
+    submsg = upb_msg_init(
+        submsg, (upb_msglayout*)subm, upb_arena_alloc(upb_env_arena(d->env)));
+    *(void**)submsg_slot = submsg;
+  }
+
+  upb_decode_message(d, limit, group_number, submsg, subm);
+
+  return true;
+}
+
+static bool upb_decode_varintfield(upb_decstate *d, upb_decframe *frame,
+                                   const char *field_start,
+                                   const upb_msglayout_fieldinit_v1 *field) {
+  uint64_t val;
+  void *field_mem;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_varint(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM: {
+      uint32_t val32 = val;
+      memcpy(field_mem, &val32, sizeof(val32));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_BOOL: {
+      bool valbool = val != 0;
+      memcpy(field_mem, &valbool, sizeof(valbool));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_SINT32: {
+      int32_t decoded = upb_zzdecode_32(val);
+      memcpy(field_mem, &decoded, sizeof(decoded));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_SINT64: {
+      int64_t decoded = upb_zzdecode_64(val);
+      memcpy(field_mem, &decoded, sizeof(decoded));
+      break;
+    }
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_64bitfield(upb_decstate *d, upb_decframe *frame,
+                                  const char *field_start,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  void *field_mem;
+  uint64_t val;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_64bit(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_32bitfield(upb_decstate *d, upb_decframe *frame,
+                                  const char *field_start,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  void *field_mem;
+  uint32_t val;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_32bit(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_fixedpacked(upb_array *arr, upb_stringview data,
+                                   int elem_size) {
+  int elements = data.size / elem_size;
+  void *field_mem;
+
+  CHK((size_t)(elements * elem_size) == data.size);
+  field_mem = upb_array_add(arr, elements);
+  CHK(field_mem);
+  memcpy(field_mem, data.data, data.size);
+  return true;
+}
+
+static bool upb_decode_toarray(upb_decstate *d, upb_decframe *frame,
+                               const char *field_start,
+                               const upb_msglayout_fieldinit_v1 *field,
+                               upb_stringview val) {
+  upb_array *arr = upb_getorcreatearr(d, frame, field);
+
+#define VARINT_CASE(ctype, decode) { \
+  const char *ptr = val.data; \
+  const char *limit = ptr + val.size; \
+  while (ptr < limit) { \
+    uint64_t val; \
+    void *field_mem; \
+    ctype decoded; \
+    CHK(upb_decode_varint(&ptr, limit, &val)); \
+    decoded = (decode)(val); \
+    field_mem = upb_array_add(arr, 1); \
+    CHK(field_mem); \
+    memcpy(field_mem, &decoded, sizeof(ctype)); \
+  } \
+  return true; \
+}
+
+  switch ((upb_descriptortype_t)field->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      void *field_mem = upb_array_add(arr, 1);
+      CHK(field_mem);
+      memcpy(field_mem, &val, sizeof(val));
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      return upb_decode_fixedpacked(arr, val, sizeof(int32_t));
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+      return upb_decode_fixedpacked(arr, val, sizeof(int64_t));
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      /* TODO: proto2 enum field that isn't in the enum. */
+      VARINT_CASE(uint32_t, uint32_t);
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      VARINT_CASE(uint64_t, uint64_t);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      VARINT_CASE(bool, bool);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      VARINT_CASE(int32_t, upb_zzdecode_32);
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      VARINT_CASE(int64_t, upb_zzdecode_64);
+    case UPB_DESCRIPTOR_TYPE_MESSAGE: {
+      const upb_msglayout_msginit_v1 *subm;
+      char *submsg;
+      void *field_mem;
+
+      CHK(val.size <= (size_t)(frame->limit - val.data));
+      d->ptr -= val.size;
+
+      /* Create elemente message. */
+      UPB_ASSERT(field->submsg_index != UPB_NO_SUBMSG);
+      subm = frame->m->submsgs[field->submsg_index];
+      UPB_ASSERT(subm);
+
+      submsg = upb_env_malloc(d->env, upb_msg_sizeof((upb_msglayout *)subm));
+      CHK(submsg);
+      submsg = upb_msg_init(submsg, (upb_msglayout*)subm,
+                            upb_arena_alloc(upb_env_arena(d->env)));
+
+      field_mem = upb_array_add(arr, 1);
+      CHK(field_mem);
+      *(void**)field_mem = submsg;
+
+      return upb_decode_message(
+          d, val.data + val.size, frame->group_number, submsg, subm);
+    }
+    case UPB_DESCRIPTOR_TYPE_GROUP:
+      return upb_append_unknown(d, frame, field_start);
+  }
+#undef VARINT_CASE
+  UPB_UNREACHABLE();
+}
+
+static bool upb_decode_delimitedfield(upb_decstate *d, upb_decframe *frame,
+                                      const char *field_start,
+                                      const upb_msglayout_fieldinit_v1 *field) {
+  upb_stringview val;
+
+  CHK(upb_decode_string(&d->ptr, frame->limit, &val));
+
+  if (field->label == UPB_LABEL_REPEATED) {
+    return upb_decode_toarray(d, frame, field_start, field, val);
+  } else {
+    switch ((upb_descriptortype_t)field->descriptortype) {
+      case UPB_DESCRIPTOR_TYPE_STRING:
+      case UPB_DESCRIPTOR_TYPE_BYTES: {
+        void *field_mem = upb_decode_prepareslot(d, frame, field);
+        CHK(field_mem);
+        memcpy(field_mem, &val, sizeof(val));
+        break;
+      }
+      case UPB_DESCRIPTOR_TYPE_MESSAGE:
+        CHK(val.size <= (size_t)(frame->limit - val.data));
+        d->ptr -= val.size;
+        CHK(upb_decode_submsg(d, frame, val.data + val.size, field, 0));
+        break;
+      default:
+        /* TODO(haberman): should we accept the last element of a packed? */
+        return upb_append_unknown(d, frame, field_start);
+    }
+    upb_decode_setpresent(frame, field);
+    return true;
+  }
+}
+
+static const upb_msglayout_fieldinit_v1 *upb_find_field(
+    const upb_msglayout_msginit_v1 *l, uint32_t field_number) {
+  /* Lots of optimization opportunities here. */
+  int i;
+  for (i = 0; i < l->field_count; i++) {
+    if (l->fields[i].number == field_number) {
+      return &l->fields[i];
+    }
+  }
+
+  return NULL;  /* Unknown field. */
+}
+
+static bool upb_decode_field(upb_decstate *d, upb_decframe *frame) {
+  int field_number;
+  int wire_type;
+  const char *field_start = d->ptr;
+  const upb_msglayout_fieldinit_v1 *field;
+
+  CHK(upb_decode_tag(&d->ptr, frame->limit, &field_number, &wire_type));
+  field = upb_find_field(frame->m, field_number);
+
+  if (field) {
+    switch (wire_type) {
+      case UPB_WIRE_TYPE_VARINT:
+        return upb_decode_varintfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_32BIT:
+        return upb_decode_32bitfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_64BIT:
+        return upb_decode_64bitfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_DELIMITED:
+        return upb_decode_delimitedfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_START_GROUP:
+        CHK(field->descriptortype == UPB_DESCRIPTOR_TYPE_GROUP);
+        return upb_decode_submsg(d, frame, frame->limit, field, field_number);
+      case UPB_WIRE_TYPE_END_GROUP:
+        CHK(frame->group_number == field_number)
+        frame->limit = d->ptr;
+        return true;
+      default:
+        return false;
+    }
+  } else {
+    CHK(field_number != 0);
+    return upb_skip_unknownfielddata(d, frame, field_number, wire_type);
+  }
+}
+
+static bool upb_skip_unknowngroup(upb_decstate *d, int field_number,
+                                  const char *limit) {
+  upb_decframe frame;
+  frame.msg = NULL;
+  frame.m = NULL;
+  frame.group_number = field_number;
+  frame.limit = limit;
+
+  while (d->ptr < frame.limit) {
+    int wire_type;
+    int field_number;
+
+    CHK(upb_decode_tag(&d->ptr, frame.limit, &field_number, &wire_type));
+    CHK(upb_skip_unknownfielddata(d, &frame, field_number, wire_type));
+  }
+
+  return true;
+}
+
+static bool upb_decode_message(upb_decstate *d, const char *limit,
+                               int group_number, char *msg,
+                               const upb_msglayout_msginit_v1 *l) {
+  upb_decframe frame;
+  frame.group_number = group_number;
+  frame.limit = limit;
+  frame.msg = msg;
+  frame.m = l;
+
+  while (d->ptr < frame.limit) {
+    CHK(upb_decode_field(d, &frame));
+  }
+
+  return true;
+}
+
+bool upb_decode(upb_stringview buf, void *msg,
+                const upb_msglayout_msginit_v1 *l, upb_env *env) {
+  upb_decstate state;
+  state.ptr = buf.data;
+  state.env = env;
+
+  return upb_decode_message(&state, buf.data + buf.size, 0, msg, l);
+}
+
+#undef CHK
 
 
 #include <ctype.h>
@@ -326,6 +2828,7 @@ static bool assign_msg_indices(upb_msgdef *m, upb_status *s) {
     v = upb_value_bool(true);
     upb_inttable_insert(&t, UPB_STARTMSG_SELECTOR, v);
     upb_inttable_insert(&t, UPB_ENDMSG_SELECTOR, v);
+    upb_inttable_insert(&t, UPB_UNKNOWN_SELECTOR, v);
     for(upb_msg_field_begin(&j, m);
         !upb_msg_field_done(&j);
         upb_msg_field_next(&j)) {
@@ -377,13 +2880,14 @@ bool _upb_def_validate(upb_def *const*defs, size_t n, upb_status *s) {
     } else if (def->type == UPB_DEF_FIELD) {
       upb_status_seterrmsg(s, "standalone fielddefs can not be frozen");
       goto err;
-    } else if (def->type == UPB_DEF_ENUM) {
-      if (!upb_validate_enumdef(upb_dyncast_enumdef(def), s)) {
-        goto err;
-      }
     } else {
       /* Set now to detect transitive closure in the second pass. */
       def->came_from_user = true;
+
+      if (def->type == UPB_DEF_ENUM &&
+          !upb_validate_enumdef(upb_dyncast_enumdef(def), s)) {
+        goto err;
+      }
     }
   }
 
@@ -710,43 +3214,6 @@ upb_fielddef *upb_fielddef_new(const void *o) {
   return f;
 }
 
-static upb_fielddef *upb_fielddef_dup(const upb_fielddef *f,
-                                      const void *owner) {
-  const char *srcname;
-  upb_fielddef *newf = upb_fielddef_new(owner);
-  if (!newf) return NULL;
-  upb_fielddef_settype(newf, upb_fielddef_type(f));
-  upb_fielddef_setlabel(newf, upb_fielddef_label(f));
-  upb_fielddef_setnumber(newf, upb_fielddef_number(f), NULL);
-  upb_fielddef_setname(newf, upb_fielddef_name(f), NULL);
-  if (f->default_is_string && f->defaultval.bytes) {
-    str_t *s = f->defaultval.bytes;
-    upb_fielddef_setdefaultstr(newf, s->str, s->len, NULL);
-  } else {
-    newf->default_is_string = f->default_is_string;
-    newf->defaultval = f->defaultval;
-  }
-
-  if (f->subdef_is_symbolic) {
-    srcname = f->sub.name;  /* Might be NULL. */
-  } else {
-    srcname = f->sub.def ? upb_def_fullname(f->sub.def) : NULL;
-  }
-  if (srcname) {
-    char *newname = upb_gmalloc(strlen(f->sub.def->fullname) + 2);
-    if (!newname) {
-      upb_fielddef_unref(newf, owner);
-      return NULL;
-    }
-    strcpy(newname, ".");
-    strcat(newname, f->sub.def->fullname);
-    upb_fielddef_setsubdefname(newf, newname, NULL);
-    upb_gfree(newname);
-  }
-
-  return newf;
-}
-
 bool upb_fielddef_typeisset(const upb_fielddef *f) {
   return f->type_is_set_;
 }
@@ -1426,44 +3893,6 @@ err2:
   return NULL;
 }
 
-static upb_oneofdef *upb_oneofdef_dup(const upb_oneofdef *o, const void *owner);
-
-static upb_msgdef *upb_msgdef_dup(const upb_msgdef *m, const void *owner) {
-  bool ok;
-  upb_msg_field_iter i;
-  upb_msg_oneof_iter o;
-
-  upb_msgdef *newm = upb_msgdef_new(owner);
-  if (!newm) return NULL;
-  ok = upb_def_setfullname(upb_msgdef_upcast_mutable(newm),
-                           upb_def_fullname(upb_msgdef_upcast(m)),
-                           NULL);
-  newm->map_entry = m->map_entry;
-  newm->syntax = m->syntax;
-  UPB_ASSERT(ok);
-  for(upb_msg_field_begin(&i, m);
-      !upb_msg_field_done(&i);
-      upb_msg_field_next(&i)) {
-    upb_fielddef *f = upb_fielddef_dup(upb_msg_iter_field(&i), &f);
-    /* Fields in oneofs are dup'd below. */
-    if (upb_fielddef_containingoneof(f)) continue;
-    if (!f || !upb_msgdef_addfield(newm, f, &f, NULL)) {
-      upb_msgdef_unref(newm, owner);
-      return NULL;
-    }
-  }
-  for(upb_msg_oneof_begin(&o, m);
-      !upb_msg_oneof_done(&o);
-      upb_msg_oneof_next(&o)) {
-    upb_oneofdef *f = upb_oneofdef_dup(upb_msg_iter_oneof(&o), &f);
-    if (!f || !upb_msgdef_addoneof(newm, f, &f, NULL)) {
-      upb_msgdef_unref(newm, owner);
-      return NULL;
-    }
-  }
-  return newm;
-}
-
 bool upb_msgdef_freeze(upb_msgdef *m, upb_status *status) {
   upb_def *d = upb_msgdef_upcast_mutable(m);
   return upb_def_freeze(&d, 1, status);
@@ -1764,24 +4193,6 @@ err2:
   return NULL;
 }
 
-static upb_oneofdef *upb_oneofdef_dup(const upb_oneofdef *o,
-                                      const void *owner) {
-  bool ok;
-  upb_oneof_iter i;
-  upb_oneofdef *newo = upb_oneofdef_new(owner);
-  if (!newo) return NULL;
-  ok = upb_oneofdef_setname(newo, upb_oneofdef_name(o), NULL);
-  UPB_ASSERT(ok);
-  for (upb_oneof_begin(&i, o); !upb_oneof_done(&i); upb_oneof_next(&i)) {
-    upb_fielddef *f = upb_fielddef_dup(upb_oneof_iter_field(&i), &f);
-    if (!f || !upb_oneofdef_addfield(newo, f, &f, NULL)) {
-      upb_oneofdef_unref(newo, owner);
-      return NULL;
-    }
-  }
-  return newo;
-}
-
 const char *upb_oneofdef_name(const upb_oneofdef *o) { return o->name; }
 
 bool upb_oneofdef_setname(upb_oneofdef *o, const char *name, upb_status *s) {
@@ -1950,6 +4361,8 @@ static void freefiledef(upb_refcounted *r) {
   upb_inttable_uninit(&f->deps);
   upb_gfree((void*)f->name);
   upb_gfree((void*)f->package);
+  upb_gfree((void*)f->phpprefix);
+  upb_gfree((void*)f->phpnamespace);
   upb_gfree(f);
 }
 
@@ -1964,6 +4377,8 @@ upb_filedef *upb_filedef_new(const void *owner) {
 
   f->package = NULL;
   f->name = NULL;
+  f->phpprefix = NULL;
+  f->phpnamespace = NULL;
   f->syntax = UPB_SYNTAX_PROTO2;
 
   if (!upb_refcounted_init(upb_filedef_upcast_mutable(f), &upb_filedef_vtbl,
@@ -1998,6 +4413,14 @@ const char *upb_filedef_package(const upb_filedef *f) {
   return f->package;
 }
 
+const char *upb_filedef_phpprefix(const upb_filedef *f) {
+  return f->phpprefix;
+}
+
+const char *upb_filedef_phpnamespace(const upb_filedef *f) {
+  return f->phpnamespace;
+}
+
 upb_syntax_t upb_filedef_syntax(const upb_filedef *f) {
   return f->syntax;
 }
@@ -2054,6 +4477,30 @@ bool upb_filedef_setpackage(upb_filedef *f, const char *package,
   return true;
 }
 
+bool upb_filedef_setphpprefix(upb_filedef *f, const char *phpprefix,
+                              upb_status *s) {
+  phpprefix = upb_gstrdup(phpprefix);
+  if (!phpprefix) {
+    upb_upberr_setoom(s);
+    return false;
+  }
+  upb_gfree((void*)f->phpprefix);
+  f->phpprefix = phpprefix;
+  return true;
+}
+
+bool upb_filedef_setphpnamespace(upb_filedef *f, const char *phpnamespace,
+                                 upb_status *s) {
+  phpnamespace = upb_gstrdup(phpnamespace);
+  if (!phpnamespace) {
+    upb_upberr_setoom(s);
+    return false;
+  }
+  upb_gfree((void*)f->phpnamespace);
+  f->phpnamespace = phpnamespace;
+  return true;
+}
+
 bool upb_filedef_setsyntax(upb_filedef *f, upb_syntax_t syntax,
                            upb_status *s) {
   UPB_UNUSED(s);
@@ -2240,57 +4687,14 @@ static bool symtab_add(upb_symtab *s, upb_def *const*defs, size_t n,
                            fullname);
         goto err;
       }
-      upb_def_donateref(def, ref_donor, s);
       if (!upb_strtable_insert(&addtab, fullname, upb_value_ptr(def)))
         goto oom_err;
-      def->came_from_user = true;
-    }
-  }
-
-  /* Add standalone fielddefs (ie. extensions) to the appropriate messages.
-   * If the appropriate message only exists in the existing symtab, duplicate
-   * it so we have a mutable copy we can add the fields to. */
-  for (i = 0; i < n; i++) {
-    upb_def *def = defs[i];
-    upb_fielddef *f = upb_dyncast_fielddef_mutable(def);
-    const char *msgname;
-    upb_value v;
-    upb_msgdef *m;
-
-    if (!f) continue;
-    msgname = upb_fielddef_containingtypename(f);
-    /* We validated this earlier in this function. */
-    UPB_ASSERT(msgname);
-
-    /* If the extendee name is absolutely qualified, move past the initial ".".
-     * TODO(haberman): it is not obvious what it would mean if this was not
-     * absolutely qualified. */
-    if (msgname[0] == '.') {
-      msgname++;
-    }
-
-    if (upb_strtable_lookup(&addtab, msgname, &v)) {
-      /* Extendee is in the set of defs the user asked us to add. */
-      m = upb_value_getptr(v);
-    } else {
-      /* Need to find and dup the extendee from the existing symtab. */
-      const upb_msgdef *frozen_m = upb_symtab_lookupmsg(s, msgname);
-      if (!frozen_m) {
-        upb_status_seterrf(status,
-                           "Tried to extend message %s that does not exist "
-                           "in this SymbolTable.",
-                           msgname);
-        goto err;
-      }
-      m = upb_msgdef_dup(frozen_m, s);
-      if (!m) goto oom_err;
-      if (!upb_strtable_insert(&addtab, msgname, upb_value_ptr(m))) {
-        upb_msgdef_unref(m, s);
-        goto oom_err;
-      }
+      upb_def_donateref(def, ref_donor, s);
     }
 
-    if (!upb_msgdef_addfield(m, f, ref_donor, status)) {
+    if (upb_dyncast_fielddef_mutable(def)) {
+      /* TODO(haberman): allow adding extensions attached to files. */
+      upb_status_seterrf(status, "Can't add extensions to symtab.\n");
       goto err;
     }
   }
@@ -2372,15 +4776,9 @@ static bool symtab_add(upb_symtab *s, upb_def *const*defs, size_t n,
   for (i = 0; i < add_n; i++) {
     upb_def *def = (upb_def*)add_objs[i];
     const char *name = upb_def_fullname(def);
-    upb_value v;
     bool success;
-
-    if (upb_strtable_remove(&s->symtab, name, &v)) {
-      const upb_def *def = upb_value_getptr(v);
-      upb_def_unref(def, s);
-    }
     success = upb_strtable_insert(&s->symtab, name, upb_value_ptr(def));
-    UPB_ASSERT(success == true);
+    UPB_ASSERT(success);
   }
   upb_gfree(add_defs);
   return true;
@@ -2413,6 +4811,9 @@ bool upb_symtab_addfile(upb_symtab *s, upb_filedef *file, upb_status *status) {
   bool ret;
 
   n = upb_filedef_defcount(file);
+  if (n == 0) {
+    return true;
+  }
   defs = upb_gmalloc(sizeof(*defs) * n);
 
   if (defs == NULL) {
@@ -2461,6 +4862,405 @@ bool upb_symtab_done(const upb_symtab_iter *iter) {
 const upb_def *upb_symtab_iter_def(const upb_symtab_iter *iter) {
   return upb_value_getptr(upb_strtable_iter_value(&iter->iter));
 }
+/* We encode backwards, to avoid pre-computing lengths (one-pass encode). */
+
+
+#define UPB_PB_VARINT_MAX_LEN 10
+#define CHK(x) do { if (!(x)) { return false; } } while(0)
+
+/* Maps descriptor type -> upb field type.  */
+static const uint8_t upb_desctype_to_fieldtype2[] = {
+  UPB_WIRE_TYPE_END_GROUP,  /* ENDGROUP */
+  UPB_TYPE_DOUBLE,          /* DOUBLE */
+  UPB_TYPE_FLOAT,           /* FLOAT */
+  UPB_TYPE_INT64,           /* INT64 */
+  UPB_TYPE_UINT64,          /* UINT64 */
+  UPB_TYPE_INT32,           /* INT32 */
+  UPB_TYPE_UINT64,          /* FIXED64 */
+  UPB_TYPE_UINT32,          /* FIXED32 */
+  UPB_TYPE_BOOL,            /* BOOL */
+  UPB_TYPE_STRING,          /* STRING */
+  UPB_TYPE_MESSAGE,         /* GROUP */
+  UPB_TYPE_MESSAGE,         /* MESSAGE */
+  UPB_TYPE_BYTES,           /* BYTES */
+  UPB_TYPE_UINT32,          /* UINT32 */
+  UPB_TYPE_ENUM,            /* ENUM */
+  UPB_TYPE_INT32,           /* SFIXED32 */
+  UPB_TYPE_INT64,           /* SFIXED64 */
+  UPB_TYPE_INT32,           /* SINT32 */
+  UPB_TYPE_INT64,           /* SINT64 */
+};
+
+static size_t upb_encode_varint(uint64_t val, char *buf) {
+  size_t i;
+  if (val < 128) { buf[0] = val; return 1; }
+  i = 0;
+  while (val) {
+    uint8_t byte = val & 0x7fU;
+    val >>= 7;
+    if (val) byte |= 0x80U;
+    buf[i++] = byte;
+  }
+  return i;
+}
+
+static uint32_t upb_zzencode_32(int32_t n) { return (n << 1) ^ (n >> 31); }
+static uint64_t upb_zzencode_64(int64_t n) { return (n << 1) ^ (n >> 63); }
+
+typedef struct {
+  upb_env *env;
+  char *buf, *ptr, *limit;
+} upb_encstate;
+
+static size_t upb_roundup_pow2(size_t bytes) {
+  size_t ret = 128;
+  while (ret < bytes) {
+    ret *= 2;
+  }
+  return ret;
+}
+
+static bool upb_encode_growbuffer(upb_encstate *e, size_t bytes) {
+  size_t old_size = e->limit - e->buf;
+  size_t new_size = upb_roundup_pow2(bytes + (e->limit - e->ptr));
+  char *new_buf = upb_env_realloc(e->env, e->buf, old_size, new_size);
+  CHK(new_buf);
+
+  /* We want previous data at the end, realloc() put it at the beginning. */
+  memmove(new_buf + new_size - old_size, e->buf, old_size);
+
+  e->ptr = new_buf + new_size - (e->limit - e->ptr);
+  e->limit = new_buf + new_size;
+  e->buf = new_buf;
+  return true;
+}
+
+/* Call to ensure that at least "bytes" bytes are available for writing at
+ * e->ptr.  Returns false if the bytes could not be allocated. */
+static bool upb_encode_reserve(upb_encstate *e, size_t bytes) {
+  CHK(UPB_LIKELY((size_t)(e->ptr - e->buf) >= bytes) ||
+      upb_encode_growbuffer(e, bytes));
+
+  e->ptr -= bytes;
+  return true;
+}
+
+/* Writes the given bytes to the buffer, handling reserve/advance. */
+static bool upb_put_bytes(upb_encstate *e, const void *data, size_t len) {
+  CHK(upb_encode_reserve(e, len));
+  memcpy(e->ptr, data, len);
+  return true;
+}
+
+static bool upb_put_fixed64(upb_encstate *e, uint64_t val) {
+  /* TODO(haberman): byte-swap for big endian. */
+  return upb_put_bytes(e, &val, sizeof(uint64_t));
+}
+
+static bool upb_put_fixed32(upb_encstate *e, uint32_t val) {
+  /* TODO(haberman): byte-swap for big endian. */
+  return upb_put_bytes(e, &val, sizeof(uint32_t));
+}
+
+static bool upb_put_varint(upb_encstate *e, uint64_t val) {
+  size_t len;
+  char *start;
+  CHK(upb_encode_reserve(e, UPB_PB_VARINT_MAX_LEN));
+  len = upb_encode_varint(val, e->ptr);
+  start = e->ptr + UPB_PB_VARINT_MAX_LEN - len;
+  memmove(start, e->ptr, len);
+  e->ptr = start;
+  return true;
+}
+
+static bool upb_put_double(upb_encstate *e, double d) {
+  uint64_t u64;
+  UPB_ASSERT(sizeof(double) == sizeof(uint64_t));
+  memcpy(&u64, &d, sizeof(uint64_t));
+  return upb_put_fixed64(e, u64);
+}
+
+static bool upb_put_float(upb_encstate *e, float d) {
+  uint32_t u32;
+  UPB_ASSERT(sizeof(float) == sizeof(uint32_t));
+  memcpy(&u32, &d, sizeof(uint32_t));
+  return upb_put_fixed32(e, u32);
+}
+
+static uint32_t upb_readcase(const char *msg, const upb_msglayout_msginit_v1 *m,
+                             int oneof_index) {
+  uint32_t ret;
+  memcpy(&ret, msg + m->oneofs[oneof_index].case_offset, sizeof(ret));
+  return ret;
+}
+
+static bool upb_readhasbit(const char *msg,
+                           const upb_msglayout_fieldinit_v1 *f) {
+  UPB_ASSERT(f->hasbit != UPB_NO_HASBIT);
+  return msg[f->hasbit / 8] & (1 << (f->hasbit % 8));
+}
+
+static bool upb_put_tag(upb_encstate *e, int field_number, int wire_type) {
+  return upb_put_varint(e, (field_number << 3) | wire_type);
+}
+
+static bool upb_put_fixedarray(upb_encstate *e, const upb_array *arr,
+                               size_t size) {
+  size_t bytes = arr->len * size;
+  return upb_put_bytes(e, arr->data, bytes) && upb_put_varint(e, bytes);
+}
+
+bool upb_encode_message(upb_encstate *e, const char *msg,
+                        const upb_msglayout_msginit_v1 *m,
+                        size_t *size);
+
+static bool upb_encode_array(upb_encstate *e, const char *field_mem,
+                             const upb_msglayout_msginit_v1 *m,
+                             const upb_msglayout_fieldinit_v1 *f) {
+  const upb_array *arr = *(const upb_array**)field_mem;
+
+  if (arr == NULL || arr->len == 0) {
+    return true;
+  }
+
+  UPB_ASSERT(arr->type == upb_desctype_to_fieldtype2[f->descriptortype]);
+
+#define VARINT_CASE(ctype, encode) { \
+  ctype *start = arr->data; \
+  ctype *ptr = start + arr->len; \
+  size_t pre_len = e->limit - e->ptr; \
+  do { \
+    ptr--; \
+    CHK(upb_put_varint(e, encode)); \
+  } while (ptr != start); \
+  CHK(upb_put_varint(e, e->limit - e->ptr - pre_len)); \
+} \
+break; \
+do { ; } while(0)
+
+  switch (f->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+      CHK(upb_put_fixedarray(e, arr, sizeof(double)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+      CHK(upb_put_fixedarray(e, arr, sizeof(float)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+      CHK(upb_put_fixedarray(e, arr, sizeof(uint64_t)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      CHK(upb_put_fixedarray(e, arr, sizeof(uint32_t)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      VARINT_CASE(uint64_t, *ptr);
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+      VARINT_CASE(uint32_t, *ptr);
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      VARINT_CASE(int32_t, (int64_t)*ptr);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      VARINT_CASE(bool, *ptr);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      VARINT_CASE(int32_t, upb_zzencode_32(*ptr));
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      VARINT_CASE(int64_t, upb_zzencode_64(*ptr));
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      upb_stringview *start = arr->data;
+      upb_stringview *ptr = start + arr->len;
+      do {
+        ptr--;
+        CHK(upb_put_bytes(e, ptr->data, ptr->size) &&
+            upb_put_varint(e, ptr->size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+      } while (ptr != start);
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_GROUP: {
+      void **start = arr->data;
+      void **ptr = start + arr->len;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      do {
+        size_t size;
+        ptr--;
+        CHK(upb_put_tag(e, f->number, UPB_WIRE_TYPE_END_GROUP) &&
+            upb_encode_message(e, *ptr, subm, &size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_START_GROUP));
+      } while (ptr != start);
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_MESSAGE: {
+      void **start = arr->data;
+      void **ptr = start + arr->len;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      do {
+        size_t size;
+        ptr--;
+        CHK(upb_encode_message(e, *ptr, subm, &size) &&
+            upb_put_varint(e, size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+      } while (ptr != start);
+      return true;
+    }
+  }
+#undef VARINT_CASE
+
+  /* We encode all primitive arrays as packed, regardless of what was specified
+   * in the .proto file.  Could special case 1-sized arrays. */
+  CHK(upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+  return true;
+}
+
+static bool upb_encode_scalarfield(upb_encstate *e, const char *field_mem,
+                                   const upb_msglayout_msginit_v1 *m,
+                                   const upb_msglayout_fieldinit_v1 *f,
+                                   bool is_proto3) {
+  bool skip_zero_value = is_proto3 && f->oneof_index == UPB_NOT_IN_ONEOF;
+
+#define CASE(ctype, type, wire_type, encodeval) do { \
+  ctype val = *(ctype*)field_mem; \
+  if (skip_zero_value && val == 0) { \
+    return true; \
+  } \
+  return upb_put_ ## type(e, encodeval) && \
+      upb_put_tag(e, f->number, wire_type); \
+} while(0)
+
+  switch (f->descriptortype) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+      CASE(double, double, UPB_WIRE_TYPE_64BIT, val);
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+      CASE(float, float, UPB_WIRE_TYPE_32BIT, val);
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      CASE(uint64_t, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+      CASE(uint32_t, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      CASE(int32_t, varint, UPB_WIRE_TYPE_VARINT, (int64_t)val);
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+      CASE(uint64_t, fixed64, UPB_WIRE_TYPE_64BIT, val);
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      CASE(uint32_t, fixed32, UPB_WIRE_TYPE_32BIT, val);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      CASE(bool, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      CASE(int32_t, varint, UPB_WIRE_TYPE_VARINT, upb_zzencode_32(val));
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      CASE(int64_t, varint, UPB_WIRE_TYPE_VARINT, upb_zzencode_64(val));
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      upb_stringview view = *(upb_stringview*)field_mem;
+      if (skip_zero_value && view.size == 0) {
+        return true;
+      }
+      return upb_put_bytes(e, view.data, view.size) &&
+          upb_put_varint(e, view.size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED);
+    }
+    case UPB_DESCRIPTOR_TYPE_GROUP: {
+      size_t size;
+      void *submsg = *(void**)field_mem;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      if (skip_zero_value && submsg == NULL) {
+        return true;
+      }
+      return upb_put_tag(e, f->number, UPB_WIRE_TYPE_END_GROUP) &&
+          upb_encode_message(e, submsg, subm, &size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_START_GROUP);
+    }
+    case UPB_DESCRIPTOR_TYPE_MESSAGE: {
+      size_t size;
+      void *submsg = *(void**)field_mem;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      if (skip_zero_value && submsg == NULL) {
+        return true;
+      }
+      return upb_encode_message(e, submsg, subm, &size) &&
+          upb_put_varint(e, size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED);
+    }
+  }
+#undef CASE
+  UPB_UNREACHABLE();
+}
+
+bool upb_encode_hasscalarfield(const char *msg,
+                               const upb_msglayout_msginit_v1 *m,
+                               const upb_msglayout_fieldinit_v1 *f) {
+  if (f->oneof_index != UPB_NOT_IN_ONEOF) {
+    return upb_readcase(msg, m, f->oneof_index) == f->number;
+  } else if (m->is_proto2) {
+    return upb_readhasbit(msg, f);
+  } else {
+    /* For proto3, we'll test for the field being empty later. */
+    return true;
+  }
+}
+
+bool upb_encode_message(upb_encstate* e, const char *msg,
+                        const upb_msglayout_msginit_v1 *m,
+                        size_t *size) {
+  int i;
+  size_t pre_len = e->limit - e->ptr;
+
+  if (msg == NULL) {
+    return true;
+  }
+
+  for (i = m->field_count - 1; i >= 0; i--) {
+    const upb_msglayout_fieldinit_v1 *f = &m->fields[i];
+
+    if (f->label == UPB_LABEL_REPEATED) {
+      CHK(upb_encode_array(e, msg + f->offset, m, f));
+    } else {
+      if (upb_encode_hasscalarfield(msg, m, f)) {
+        if (f->oneof_index == UPB_NOT_IN_ONEOF) {
+          CHK(upb_encode_scalarfield(e, msg + f->offset, m, f, !m->is_proto2));
+        } else {
+          const upb_msglayout_oneofinit_v1 *o = &m->oneofs[f->oneof_index];
+          CHK(upb_encode_scalarfield(e, msg + o->data_offset,
+                                     m, f, !m->is_proto2));
+        }
+      }
+    }
+  }
+
+  *size = (e->limit - e->ptr) - pre_len;
+  return true;
+}
+
+char *upb_encode(const void *msg, const upb_msglayout_msginit_v1 *m,
+                 upb_env *env, size_t *size) {
+  upb_encstate e;
+  e.env = env;
+  e.buf = NULL;
+  e.limit = NULL;
+  e.ptr = NULL;
+
+  if (!upb_encode_message(&e, msg, m, size)) {
+    *size = 0;
+    return NULL;
+  }
+
+  *size = e.limit - e.ptr;
+
+  if (*size == 0) {
+    static char ch;
+    return &ch;
+  } else {
+    UPB_ASSERT(e.ptr);
+    return e.ptr;
+  }
+}
+
+#undef CHK
 /*
 ** TODO(haberman): it's unclear whether a lot of the consistency checks should
 ** UPB_ASSERT() or return false.
@@ -2832,6 +5632,12 @@ SETTER(endseq,      upb_endfield_handlerfunc*,    UPB_HANDLER_ENDSEQ)
 
 #undef SETTER
 
+bool upb_handlers_setunknown(upb_handlers *h, upb_unknown_handlerfunc *func,
+                             upb_handlerattr *attr) {
+  return doset(h, UPB_UNKNOWN_SELECTOR, NULL, UPB_HANDLER_INT32,
+               (upb_func *)func, attr);
+}
+
 bool upb_handlers_setstartmsg(upb_handlers *h, upb_startmsg_handlerfunc *func,
                               upb_handlerattr *attr) {
   return doset(h, UPB_STARTMSG_SELECTOR, NULL, UPB_HANDLER_INT32,
@@ -3181,7 +5987,8 @@ bool upb_fieldtype_mapkeyok(upb_fieldtype_t type) {
 void *upb_array_pack(const upb_array *arr, void *p, size_t *ofs, size_t size);
 void *upb_map_pack(const upb_map *map, void *p, size_t *ofs, size_t size);
 
-#define CHARPTR_AT(msg, ofs) ((char*)msg + ofs)
+#define PTR_AT(msg, ofs, type) (type*)((char*)msg + ofs)
+#define VOIDPTR_AT(msg, ofs) PTR_AT(msg, ofs, void)
 #define ENCODE_MAX_NESTING 64
 #define CHECK_TRUE(x) if (!(x)) { return false; }
 
@@ -3219,16 +6026,24 @@ static size_t upb_msgval_sizeof(upb_fieldtype_t type) {
       return 4;
     case UPB_TYPE_BOOL:
       return 1;
-    case UPB_TYPE_BYTES:
     case UPB_TYPE_MESSAGE:
       return sizeof(void*);
+    case UPB_TYPE_BYTES:
     case UPB_TYPE_STRING:
-      return sizeof(char*) + sizeof(size_t);
+      return sizeof(upb_stringview);
   }
   UPB_UNREACHABLE();
 }
 
-static uint8_t upb_msg_fieldsize(const upb_fielddef *f) {
+static uint8_t upb_msg_fieldsize(const upb_msglayout_fieldinit_v1 *field) {
+  if (field->label == UPB_LABEL_REPEATED) {
+    return sizeof(void*);
+  } else {
+    return upb_msgval_sizeof(upb_desctype_to_fieldtype[field->descriptortype]);
+  }
+}
+
+static uint8_t upb_msg_fielddefsize(const upb_fielddef *f) {
   if (upb_fielddef_isseq(f)) {
     return sizeof(void*);
   } else {
@@ -3272,7 +6087,6 @@ static upb_ctype_t upb_fieldtotabtype(upb_fieldtype_t type) {
 }
 
 static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
-  /* TODO(haberman): improve/optimize this (maybe use upb_msgval in fielddef) */
   switch (upb_fielddef_type(f)) {
       case UPB_TYPE_FLOAT:
         return upb_msgval_float(upb_fielddef_defaultfloat(f));
@@ -3284,7 +6098,7 @@ static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
       case UPB_TYPE_BYTES: {
         size_t len;
         const char *ptr = upb_fielddef_defaultstr(f, &len);
-        return upb_msgval_str(ptr, len);
+        return upb_msgval_makestr(ptr, len);
       }
       case UPB_TYPE_MESSAGE:
         return upb_msgval_msg(NULL);
@@ -3307,63 +6121,44 @@ static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
 /** upb_msglayout *************************************************************/
 
 struct upb_msglayout {
-  upb_msgfactory *factory;
-  const upb_msgdef *msgdef;
-  size_t size;
-  size_t extdict_offset;
-  void *default_msg;
-  uint32_t *field_offsets;
-  uint32_t *case_offsets;
-  uint32_t *hasbits;
-  bool has_extdict;
-  uint8_t align;
+  struct upb_msglayout_msginit_v1 data;
 };
 
-static void upb_msg_checkfield(const upb_msglayout *l, const upb_fielddef *f) {
-  UPB_ASSERT(l->msgdef == upb_fielddef_containingtype(f));
-}
-
 static void upb_msglayout_free(upb_msglayout *l) {
-  upb_gfree(l->default_msg);
+  upb_gfree(l->data.default_msg);
   upb_gfree(l);
 }
 
-const upb_msgdef *upb_msglayout_msgdef(const upb_msglayout *l) {
-  return l->msgdef;
-}
-
 static size_t upb_msglayout_place(upb_msglayout *l, size_t size) {
   size_t ret;
 
-  l->size = align_up(l->size, size);
-  l->align = align_up(l->align, size);
-  ret = l->size;
-  l->size += size;
+  l->data.size = align_up(l->data.size, size);
+  ret = l->data.size;
+  l->data.size += size;
   return ret;
 }
 
 static uint32_t upb_msglayout_offset(const upb_msglayout *l,
                                      const upb_fielddef *f) {
-  return l->field_offsets[upb_fielddef_index(f)];
+  return l->data.fields[upb_fielddef_index(f)].offset;
 }
 
 static uint32_t upb_msglayout_hasbit(const upb_msglayout *l,
                                      const upb_fielddef *f) {
-  return l->hasbits[upb_fielddef_index(f)];
+  return l->data.fields[upb_fielddef_index(f)].hasbit;
 }
 
-static bool upb_msglayout_initdefault(upb_msglayout *l) {
-  const upb_msgdef *m = l->msgdef;
+static bool upb_msglayout_initdefault(upb_msglayout *l, const upb_msgdef *m) {
   upb_msg_field_iter it;
 
-  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2 && l->size) {
+  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2 && l->data.size) {
     /* Allocate default message and set default values in it. */
-    l->default_msg = upb_gmalloc(l->size);
-    if (!l->default_msg) {
+    l->data.default_msg = upb_gmalloc(l->data.size);
+    if (!l->data.default_msg) {
       return false;
     }
 
-    memset(l->default_msg, 0, l->size);
+    memset(l->data.default_msg, 0, l->data.size);
 
     for (upb_msg_field_begin(&it, m); !upb_msg_field_done(&it);
          upb_msg_field_next(&it)) {
@@ -3373,10 +6168,14 @@ static bool upb_msglayout_initdefault(upb_msglayout *l) {
         continue;
       }
 
+      /* TODO(haberman): handle strings. */
       if (!upb_fielddef_isstring(f) &&
           !upb_fielddef_issubmsg(f) &&
           !upb_fielddef_isseq(f)) {
-        upb_msg_set(l->default_msg, f, upb_msgval_fromdefault(f), l);
+        upb_msg_set(l->data.default_msg,
+                    upb_fielddef_index(f),
+                    upb_msgval_fromdefault(f),
+                    l);
       }
     }
   }
@@ -3384,27 +6183,48 @@ static bool upb_msglayout_initdefault(upb_msglayout *l) {
   return true;
 }
 
-static upb_msglayout *upb_msglayout_new(const upb_msgdef *m) {
+static bool upb_msglayout_init(const upb_msgdef *m,
+                               upb_msglayout *l,
+                               upb_msgfactory *factory) {
   upb_msg_field_iter it;
   upb_msg_oneof_iter oit;
-  upb_msglayout *l;
   size_t hasbit;
-  size_t array_size = upb_msgdef_numfields(m) + upb_msgdef_numoneofs(m);
+  size_t submsg_count = 0;
+  const upb_msglayout_msginit_v1 **submsgs;
+  upb_msglayout_fieldinit_v1 *fields;
+  upb_msglayout_oneofinit_v1 *oneofs;
 
-  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2) {
-    array_size += upb_msgdef_numfields(m);  /* hasbits. */
+  for (upb_msg_field_begin(&it, m);
+       !upb_msg_field_done(&it);
+       upb_msg_field_next(&it)) {
+    const upb_fielddef* f = upb_msg_iter_field(&it);
+    if (upb_fielddef_issubmsg(f)) {
+      submsg_count++;
+    }
   }
 
-  l = upb_gmalloc(sizeof(*l) + (sizeof(uint32_t) * array_size));
-  if (!l) return NULL;
-
   memset(l, 0, sizeof(*l));
 
-  l->msgdef = m;
-  l->align = 1;
-  l->field_offsets = (uint32_t*)CHARPTR_AT(l, sizeof(*l));
-  l->case_offsets = l->field_offsets + upb_msgdef_numfields(m);
-  l->hasbits = l->case_offsets + upb_msgdef_numoneofs(m);
+  fields = upb_gmalloc(upb_msgdef_numfields(m) * sizeof(*fields));
+  submsgs = upb_gmalloc(submsg_count * sizeof(*submsgs));
+  oneofs = upb_gmalloc(upb_msgdef_numoneofs(m) * sizeof(*oneofs));
+
+  if ((!fields && upb_msgdef_numfields(m)) ||
+      (!submsgs && submsg_count) ||
+      (!oneofs && upb_msgdef_numoneofs(m))) {
+    /* OOM. */
+    upb_gfree(fields);
+    upb_gfree(submsgs);
+    upb_gfree(oneofs);
+    return false;
+  }
+
+  l->data.field_count = upb_msgdef_numfields(m);
+  l->data.oneof_count = upb_msgdef_numoneofs(m);
+  l->data.fields = fields;
+  l->data.submsgs = submsgs;
+  l->data.oneofs = oneofs;
+  l->data.is_proto2 = (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2);
 
   /* Allocate data offsets in three stages:
    *
@@ -3415,83 +6235,87 @@ static upb_msglayout *upb_msglayout_new(const upb_msgdef *m) {
    * OPT: There is a lot of room for optimization here to minimize the size.
    */
 
-  /* Allocate hasbits.  Start at sizeof(void*) for upb_alloc*. */
-  for (upb_msg_field_begin(&it, m), hasbit = sizeof(void*) * 8;
+  /* Allocate hasbits and set basic field attributes. */
+  submsg_count = 0;
+  for (upb_msg_field_begin(&it, m), hasbit = 0;
        !upb_msg_field_done(&it);
        upb_msg_field_next(&it)) {
     const upb_fielddef* f = upb_msg_iter_field(&it);
+    upb_msglayout_fieldinit_v1 *field = &fields[upb_fielddef_index(f)];
+
+    field->number = upb_fielddef_number(f);
+    field->descriptortype = upb_fielddef_descriptortype(f);
+    field->label = upb_fielddef_label(f);
+
+    if (upb_fielddef_containingoneof(f)) {
+      field->oneof_index = upb_oneofdef_index(upb_fielddef_containingoneof(f));
+    } else {
+      field->oneof_index = UPB_NOT_IN_ONEOF;
+    }
+
+    if (upb_fielddef_issubmsg(f)) {
+      const upb_msglayout *sub_layout =
+          upb_msgfactory_getlayout(factory, upb_fielddef_msgsubdef(f));
+      field->submsg_index = submsg_count++;
+      submsgs[field->submsg_index] = &sub_layout->data;
+    } else {
+      field->submsg_index = UPB_NO_SUBMSG;
+    }
 
     if (upb_fielddef_haspresence(f) && !upb_fielddef_containingoneof(f)) {
-      l->hasbits[upb_fielddef_index(f)] = hasbit++;
+      field->hasbit = hasbit++;
+    } else {
+      field->hasbit = UPB_NO_HASBIT;
     }
   }
 
   /* Account for space used by hasbits. */
-  l->size = div_round_up(hasbit, 8);
+  l->data.size = div_round_up(hasbit, 8);
 
   /* Allocate non-oneof fields. */
   for (upb_msg_field_begin(&it, m); !upb_msg_field_done(&it);
        upb_msg_field_next(&it)) {
     const upb_fielddef* f = upb_msg_iter_field(&it);
-    size_t field_size = upb_msg_fieldsize(f);
+    size_t field_size = upb_msg_fielddefsize(f);
     size_t index = upb_fielddef_index(f);
 
-
     if (upb_fielddef_containingoneof(f)) {
       /* Oneofs are handled separately below. */
       continue;
     }
 
-    l->field_offsets[index] = upb_msglayout_place(l, field_size);
+    fields[index].offset = upb_msglayout_place(l, field_size);
   }
 
   /* Allocate oneof fields.  Each oneof field consists of a uint32 for the case
    * and space for the actual data. */
   for (upb_msg_oneof_begin(&oit, m); !upb_msg_oneof_done(&oit);
        upb_msg_oneof_next(&oit)) {
-    const upb_oneofdef* oneof = upb_msg_iter_oneof(&oit);
+    const upb_oneofdef* o = upb_msg_iter_oneof(&oit);
     upb_oneof_iter fit;
+
     size_t case_size = sizeof(uint32_t);  /* Could potentially optimize this. */
+    upb_msglayout_oneofinit_v1 *oneof = &oneofs[upb_oneofdef_index(o)];
     size_t field_size = 0;
-    size_t case_offset;
-    size_t val_offset;
 
     /* Calculate field size: the max of all field sizes. */
-    for (upb_oneof_begin(&fit, oneof);
+    for (upb_oneof_begin(&fit, o);
          !upb_oneof_done(&fit);
          upb_oneof_next(&fit)) {
       const upb_fielddef* f = upb_oneof_iter_field(&fit);
-      field_size = UPB_MAX(field_size, upb_msg_fieldsize(f));
+      field_size = UPB_MAX(field_size, upb_msg_fielddefsize(f));
     }
 
     /* Align and allocate case offset. */
-    case_offset = upb_msglayout_place(l, case_size);
-    val_offset = upb_msglayout_place(l, field_size);
-
-    l->case_offsets[upb_oneofdef_index(oneof)] = case_offset;
-
-    /* Assign all fields in the oneof this same offset. */
-    for (upb_oneof_begin(&fit, oneof); !upb_oneof_done(&fit);
-         upb_oneof_next(&fit)) {
-      const upb_fielddef* f = upb_oneof_iter_field(&fit);
-      l->field_offsets[upb_fielddef_index(f)] = val_offset;
-    }
+    oneof->case_offset = upb_msglayout_place(l, case_size);
+    oneof->data_offset = upb_msglayout_place(l, field_size);
   }
 
   /* Size of the entire structure should be a multiple of its greatest
-   * alignment. */
-  l->size = align_up(l->size, l->align);
+   * alignment.  TODO: track overall alignment for real? */
+  l->data.size = align_up(l->data.size, 8);
 
-  if (upb_msglayout_initdefault(l)) {
-    return l;
-  } else {
-    upb_msglayout_free(l);
-    return NULL;
-  }
-}
-
-upb_msgfactory *upb_msglayout_factory(const upb_msglayout *layout) {
-  return layout->factory;
+  return upb_msglayout_initdefault(l, m);
 }
 
 
@@ -3546,11 +6370,14 @@ const upb_msglayout *upb_msgfactory_getlayout(upb_msgfactory *f,
     UPB_ASSERT(upb_value_getptr(v));
     return upb_value_getptr(v);
   } else {
+    /* In case of circular dependency, layout has to be inserted first. */
+    upb_msglayout *l = upb_gmalloc(sizeof(*l));
     upb_msgfactory *mutable_f = (void*)f;
-    upb_msglayout *l = upb_msglayout_new(m);
     upb_inttable_insertptr(&mutable_f->layouts, m, upb_value_ptr(l));
     UPB_ASSERT(l);
-    l->factory = f;
+    if (!upb_msglayout_init(m, l, f)) {
+      upb_msglayout_free(l);
+    }
     return l;
   }
 }
@@ -3559,16 +6386,15 @@ const upb_msglayout *upb_msgfactory_getlayout(upb_msgfactory *f,
 
 void *upb_msg_startstr(void *msg, const void *hd, size_t size_hint) {
   uint32_t ofs = (uintptr_t)hd;
-  /* We pass NULL here because we know we can get away with it. */
-  upb_alloc *alloc = upb_msg_alloc(msg, NULL);
+  upb_alloc *alloc = upb_msg_alloc(msg);
   upb_msgval val;
   UPB_UNUSED(size_hint);
 
   val = upb_msgval_read(msg, ofs, upb_msgval_sizeof(UPB_TYPE_STRING));
 
-  upb_free(alloc, (void*)val.str.ptr);
-  val.str.ptr = NULL;
-  val.str.len = 0;
+  upb_free(alloc, (void*)val.str.data);
+  val.str.data = NULL;
+  val.str.size = 0;
 
   upb_msgval_write(msg, ofs, val, upb_msgval_sizeof(UPB_TYPE_STRING));
   return msg;
@@ -3577,23 +6403,22 @@ void *upb_msg_startstr(void *msg, const void *hd, size_t size_hint) {
 size_t upb_msg_str(void *msg, const void *hd, const char *ptr, size_t size,
                    const upb_bufhandle *handle) {
   uint32_t ofs = (uintptr_t)hd;
-  /* We pass NULL here because we know we can get away with it. */
-  upb_alloc *alloc = upb_msg_alloc(msg, NULL);
+  upb_alloc *alloc = upb_msg_alloc(msg);
   upb_msgval val;
   size_t newsize;
   UPB_UNUSED(handle);
 
   val = upb_msgval_read(msg, ofs, upb_msgval_sizeof(UPB_TYPE_STRING));
 
-  newsize = val.str.len + size;
-  val.str.ptr = upb_realloc(alloc, (void*)val.str.ptr, val.str.len, newsize);
+  newsize = val.str.size + size;
+  val.str.data = upb_realloc(alloc, (void*)val.str.data, val.str.size, newsize);
 
-  if (!val.str.ptr) {
+  if (!val.str.data) {
     return false;
   }
 
-  memcpy((char*)val.str.ptr + val.str.len, ptr, size);
-  val.str.len = newsize;
+  memcpy((char*)val.str.data + val.str.size, ptr, size);
+  val.str.size = newsize;
   upb_msgval_write(msg, ofs, val, upb_msgval_sizeof(UPB_TYPE_STRING));
   return size;
 }
@@ -3658,13 +6483,14 @@ static upb_selector_t getsel2(const upb_fielddef *f, upb_handlertype_t type) {
 
 static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
                                  const upb_msglayout *layout) {
+  int field_index = upb_fielddef_index(f);
   if (upb_fielddef_isseq(f)) {
-    return upb_msgval_getarr(upb_msg_get(msg, f, layout)) != NULL;
+    return upb_msgval_getarr(upb_msg_get(msg, field_index, layout)) != NULL;
   } else if (upb_msgdef_syntax(upb_fielddef_containingtype(f)) ==
              UPB_SYNTAX_PROTO2) {
-    return upb_msg_has(msg, f, layout);
+    return upb_msg_has(msg, field_index, layout);
   } else {
-    upb_msgval val = upb_msg_get(msg, f, layout);
+    upb_msgval val = upb_msg_get(msg, field_index, layout);
     switch (upb_fielddef_type(f)) {
       case UPB_TYPE_FLOAT:
         return upb_msgval_getfloat(val) != 0;
@@ -3683,7 +6509,7 @@ static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
         return upb_msgval_getuint64(val) != 0;
       case UPB_TYPE_STRING:
       case UPB_TYPE_BYTES:
-        return upb_msgval_getstr(val) && upb_msgval_getstrlen(val) > 0;
+        return upb_msgval_getstr(val).size > 0;
       case UPB_TYPE_MESSAGE:
         return upb_msgval_getmsg(val) != NULL;
     }
@@ -3694,7 +6520,7 @@ static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
 static bool upb_visitor_visitmsg2(const upb_msg *msg,
                                   const upb_msglayout *layout, upb_sink *sink,
                                   int depth) {
-  const upb_msgdef *md = upb_msglayout_msgdef(layout);
+  const upb_msgdef *md = upb_handlers_msgdef(sink->handlers);
   upb_msg_field_iter i;
   upb_status status;
 
@@ -3716,7 +6542,7 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
       continue;
     }
 
-    val = upb_msg_get(msg, f, layout);
+    val = upb_msg_get(msg, upb_fielddef_index(f), layout);
 
     if (upb_fielddef_isseq(f)) {
       const upb_array *arr = upb_msgval_getarr(val);
@@ -3737,8 +6563,7 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
           CHECK_TRUE(upb_sink_putfloat(sink, sel, upb_msgval_getfloat(val)));
           break;
         case UPB_TYPE_DOUBLE:
-          CHECK_TRUE(
-              upb_sink_putdouble(sink, sel, upb_msgval_getdouble(val)));
+          CHECK_TRUE(upb_sink_putdouble(sink, sel, upb_msgval_getdouble(val)));
           break;
         case UPB_TYPE_BOOL:
           CHECK_TRUE(upb_sink_putbool(sink, sel, upb_msgval_getbool(val)));
@@ -3748,15 +6573,13 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
           CHECK_TRUE(upb_sink_putint32(sink, sel, upb_msgval_getint32(val)));
           break;
         case UPB_TYPE_UINT32:
-          CHECK_TRUE(
-              upb_sink_putuint32(sink, sel, upb_msgval_getuint32(val)));
+          CHECK_TRUE(upb_sink_putuint32(sink, sel, upb_msgval_getuint32(val)));
           break;
         case UPB_TYPE_INT64:
           CHECK_TRUE(upb_sink_putint64(sink, sel, upb_msgval_getint64(val)));
           break;
         case UPB_TYPE_UINT64:
-          CHECK_TRUE(
-              upb_sink_putuint64(sink, sel, upb_msgval_getuint64(val)));
+          CHECK_TRUE(upb_sink_putuint64(sink, sel, upb_msgval_getuint64(val)));
           break;
         case UPB_TYPE_STRING:
         case UPB_TYPE_BYTES:
@@ -3788,194 +6611,160 @@ bool upb_visitor_visitmsg(upb_visitor *visitor, const upb_msg *msg) {
 /* If we always read/write as a consistent type to each address, this shouldn't
  * violate aliasing.
  */
-#define DEREF(msg, ofs, type) *(type*)CHARPTR_AT(msg, ofs)
+#define DEREF(msg, ofs, type) *PTR_AT(msg, ofs, type)
 
-static upb_inttable *upb_msg_trygetextdict(const upb_msg *msg,
-                                           const upb_msglayout *l) {
-  return l->has_extdict ? DEREF(msg, l->extdict_offset, upb_inttable*) : NULL;
-}
-
-static upb_inttable *upb_msg_getextdict(upb_msg *msg,
-                                        const upb_msglayout *l,
-                                        upb_alloc *a) {
-  upb_inttable *ext_dict;
-  UPB_ASSERT(l->has_extdict);
+/* Internal members of a upb_msg.  We can change this without breaking binary
+ * compatibility.  We put these before the user's data.  The user's upb_msg*
+ * points after the upb_msg_internal. */
 
-  ext_dict = upb_msg_trygetextdict(msg, l);
+/* Used when a message is not extendable. */
+typedef struct {
+  /* TODO(haberman): add unknown fields. */
+  upb_alloc *alloc;
+} upb_msg_internal;
 
-  if (!ext_dict) {
-    ext_dict = upb_malloc(a, sizeof(upb_inttable));
+/* Used when a message is extendable. */
+typedef struct {
+  upb_inttable *extdict;
+  upb_msg_internal base;
+} upb_msg_internal_withext;
 
-    if (!ext_dict) {
-      return NULL;
-    }
+static int upb_msg_internalsize(const upb_msglayout *l) {
+    return sizeof(upb_msg_internal) - l->data.extendable * sizeof(void*);
+}
 
-    /* Use an 8-byte type to ensure all bytes are copied. */
-    if (!upb_inttable_init2(ext_dict, UPB_CTYPE_INT64, a)) {
-      upb_free(a, ext_dict);
-      return NULL;
-    }
+static upb_msg_internal *upb_msg_getinternal(upb_msg *msg) {
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+}
 
-    DEREF(msg, l->extdict_offset, upb_inttable*) = ext_dict;
-  }
+static const upb_msg_internal *upb_msg_getinternal_const(const upb_msg *msg) {
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+}
 
-  return ext_dict;
+static upb_msg_internal_withext *upb_msg_getinternalwithext(
+    upb_msg *msg, const upb_msglayout *l) {
+  UPB_ASSERT(l->data.extendable);
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal_withext));
 }
 
-static uint32_t upb_msg_getoneofint(const upb_msg *msg,
-                                    const upb_oneofdef *o,
-                                    const upb_msglayout *l) {
-  size_t oneof_ofs = l->case_offsets[upb_oneofdef_index(o)];
-  return DEREF(msg, oneof_ofs, uint8_t);
+static const upb_msglayout_fieldinit_v1 *upb_msg_checkfield(
+    int field_index, const upb_msglayout *l) {
+  UPB_ASSERT(field_index >= 0 && field_index < l->data.field_count);
+  return &l->data.fields[field_index];
 }
 
-static void upb_msg_setoneofcase(const upb_msg *msg,
-                                 const upb_oneofdef *o,
-                                 const upb_msglayout *l,
-                                 uint32_t val) {
-  size_t oneof_ofs = l->case_offsets[upb_oneofdef_index(o)];
-  DEREF(msg, oneof_ofs, uint8_t) = val;
+static bool upb_msg_inoneof(const upb_msglayout_fieldinit_v1 *field) {
+  return field->oneof_index != UPB_NOT_IN_ONEOF;
 }
 
+static uint32_t *upb_msg_oneofcase(const upb_msg *msg, int field_index,
+                                   const upb_msglayout *l) {
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  UPB_ASSERT(upb_msg_inoneof(field));
+  return PTR_AT(msg, l->data.oneofs[field->oneof_index].case_offset, uint32_t);
+}
 
-static bool upb_msg_oneofis(const upb_msg *msg, const upb_msglayout *l,
-                            const upb_oneofdef *o, const upb_fielddef *f) {
-  return upb_msg_getoneofint(msg, o, l) == upb_fielddef_number(f);
+size_t upb_msg_sizeof(const upb_msglayout *l) {
+  return l->data.size + upb_msg_internalsize(l);
 }
 
-size_t upb_msg_sizeof(const upb_msglayout *l) { return l->size; }
+upb_msg *upb_msg_init(void *mem, const upb_msglayout *l, upb_alloc *a) {
+  upb_msg *msg = VOIDPTR_AT(mem, upb_msg_internalsize(l));
 
-void upb_msg_init(upb_msg *msg, const upb_msglayout *l, upb_alloc *a) {
-  if (l->default_msg) {
-    memcpy(msg, l->default_msg, l->size);
+  /* Initialize normal members. */
+  if (l->data.default_msg) {
+    memcpy(msg, l->data.default_msg, l->data.size);
   } else {
-    memset(msg, 0, l->size);
+    memset(msg, 0, l->data.size);
   }
 
-  /* Set arena pointer. */
-  memcpy(msg, &a, sizeof(a));
-}
+  /* Initialize internal members. */
+  upb_msg_getinternal(msg)->alloc = a;
 
-void upb_msg_uninit(upb_msg *msg, const upb_msglayout *l) {
-  upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-  if (ext_dict) {
-    upb_inttable_uninit2(ext_dict, upb_msg_alloc(msg, l));
+  if (l->data.extendable) {
+    upb_msg_getinternalwithext(msg, l)->extdict = NULL;
   }
-}
 
-upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a) {
-  upb_msg *msg = upb_malloc(a, upb_msg_sizeof(l));
+  return msg;
+}
 
-  if (msg) {
-    upb_msg_init(msg, l, a);
+void *upb_msg_uninit(upb_msg *msg, const upb_msglayout *l) {
+  if (l->data.extendable) {
+    upb_inttable *ext_dict = upb_msg_getinternalwithext(msg, l)->extdict;
+    if (ext_dict) {
+      upb_inttable_uninit2(ext_dict, upb_msg_alloc(msg));
+      upb_free(upb_msg_alloc(msg), ext_dict);
+    }
   }
 
-  return msg;
+  return VOIDPTR_AT(msg, -upb_msg_internalsize(l));
+}
+
+upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a) {
+  void *mem = upb_malloc(a, upb_msg_sizeof(l));
+  return mem ? upb_msg_init(mem, l, a) : NULL;
 }
 
 void upb_msg_free(upb_msg *msg, const upb_msglayout *l) {
-  upb_msg_uninit(msg, l);
-  upb_free(upb_msg_alloc(msg, l), msg);
+  upb_free(upb_msg_alloc(msg), upb_msg_uninit(msg, l));
 }
 
-upb_alloc *upb_msg_alloc(const upb_msg *msg, const upb_msglayout *l) {
-  upb_alloc *alloc;
-  UPB_UNUSED(l);
-  memcpy(&alloc, msg, sizeof(alloc));
-  return alloc;
+upb_alloc *upb_msg_alloc(const upb_msg *msg) {
+  return upb_msg_getinternal_const(msg)->alloc;
 }
 
 bool upb_msg_has(const upb_msg *msg,
-                 const upb_fielddef *f,
+                 int field_index,
                  const upb_msglayout *l) {
-  const upb_oneofdef *o;
-  upb_msg_checkfield(l, f);
-  UPB_ASSERT(upb_fielddef_haspresence(f));
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
 
-  if (upb_fielddef_isextension(f)) {
-    /* Extensions are set when they are present in the extension dict. */
-    upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-    upb_value v;
-    return ext_dict != NULL &&
-           upb_inttable_lookup32(ext_dict, upb_fielddef_number(f), &v);
-  } else if ((o = upb_fielddef_containingoneof(f)) != NULL) {
+  UPB_ASSERT(l->data.is_proto2);
+
+  if (upb_msg_inoneof(field)) {
     /* Oneofs are set when the oneof number is set to this field. */
-    return upb_msg_getoneofint(msg, o, l) == upb_fielddef_number(f);
+    return *upb_msg_oneofcase(msg, field_index, l) == field->number;
   } else {
     /* Other fields are set when their hasbit is set. */
-    uint32_t hasbit = l->hasbits[upb_fielddef_index(f)];
+    uint32_t hasbit = l->data.fields[field_index].hasbit;
     return DEREF(msg, hasbit / 8, char) | (1 << (hasbit % 8));
   }
 }
 
-upb_msgval upb_msg_get(const upb_msg *msg, const upb_fielddef *f,
+upb_msgval upb_msg_get(const upb_msg *msg, int field_index,
                        const upb_msglayout *l) {
-  upb_msg_checkfield(l, f);
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  int size = upb_msg_fieldsize(field);
 
-  if (upb_fielddef_isextension(f)) {
-    upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-    upb_value val;
-    if (upb_inttable_lookup32(ext_dict, upb_fielddef_number(f), &val)) {
-      return upb_msgval_fromval(val);
+  if (upb_msg_inoneof(field)) {
+    if (*upb_msg_oneofcase(msg, field_index, l) == field->number) {
+      size_t ofs = l->data.oneofs[field->oneof_index].data_offset;
+      return upb_msgval_read(msg, ofs, size);
     } else {
-      return upb_msgval_fromdefault(f);
+      /* Return default. */
+      return upb_msgval_read(l->data.default_msg, field->offset, size);
     }
   } else {
-    size_t ofs = l->field_offsets[upb_fielddef_index(f)];
-    const upb_oneofdef *o = upb_fielddef_containingoneof(f);
-    upb_msgval ret;
-
-    if (o && !upb_msg_oneofis(msg, l, o, f)) {
-      /* Oneof defaults can't come from the message because the memory is reused
-       * by all types in the oneof. */
-      return upb_msgval_fromdefault(f);
-    }
-
-    ret = upb_msgval_read(msg, ofs, upb_msg_fieldsize(f));
-    return ret;
+    return upb_msgval_read(msg, field->offset, size);
   }
 }
 
-bool upb_msg_set(upb_msg *msg,
-                 const upb_fielddef *f,
-                 upb_msgval val,
+void upb_msg_set(upb_msg *msg, int field_index, upb_msgval val,
                  const upb_msglayout *l) {
-  upb_alloc *a = upb_msg_alloc(msg, l);
-  upb_msg_checkfield(l, f);
-
-  if (upb_fielddef_isextension(f)) {
-    /* TODO(haberman): introduce table API that can do this in one call. */
-    upb_inttable *ext = upb_msg_getextdict(msg, l, a);
-    upb_value val2 = upb_toval(val);
-    if (!upb_inttable_replace(ext, upb_fielddef_number(f), val2) &&
-        !upb_inttable_insert2(ext, upb_fielddef_number(f), val2, a)) {
-      return false;
-    }
-  } else {
-    size_t ofs = l->field_offsets[upb_fielddef_index(f)];
-    const upb_oneofdef *o = upb_fielddef_containingoneof(f);
-
-    if (o) {
-      upb_msg_setoneofcase(msg, o, l, upb_fielddef_number(f));
-    }
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  int size = upb_msg_fieldsize(field);
 
-    upb_msgval_write(msg, ofs, val, upb_msg_fieldsize(f));
+  if (upb_msg_inoneof(field)) {
+    size_t ofs = l->data.oneofs[field->oneof_index].data_offset;
+    *upb_msg_oneofcase(msg, field_index, l) = field->number;
+    upb_msgval_write(msg, ofs, val, size);
+  } else {
+    upb_msgval_write(msg, field->offset, val, size);
   }
-  return true;
 }
 
 
 /** upb_array *****************************************************************/
 
-struct upb_array {
-  upb_fieldtype_t type;
-  uint8_t element_size;
-  void *data;   /* Each element is element_size. */
-  size_t len;   /* Measured in elements. */
-  size_t size;  /* Measured in elements. */
-  upb_alloc *alloc;
-};
-
 #define DEREF_ARR(arr, i, type) ((type*)arr->data)[i]
 
 size_t upb_array_sizeof(upb_fieldtype_t type) {
@@ -4070,8 +6859,8 @@ static void upb_map_tokey(upb_fieldtype_t type, upb_msgval *key,
   switch (type) {
     case UPB_TYPE_STRING:
       /* Point to string data of the input key. */
-      *out_key = key->str.ptr;
-      *out_len = key->str.len;
+      *out_key = key->str.data;
+      *out_len = key->str.size;
       return;
     case UPB_TYPE_BOOL:
     case UPB_TYPE_INT32:
@@ -4096,7 +6885,7 @@ static upb_msgval upb_map_fromkey(upb_fieldtype_t type, const char *key,
                                   size_t len) {
   switch (type) {
     case UPB_TYPE_STRING:
-      return upb_msgval_str(key, len);
+      return upb_msgval_makestr(key, len);
     case UPB_TYPE_BOOL:
     case UPB_TYPE_INT32:
     case UPB_TYPE_UINT32:
@@ -6545,162 +9334,164 @@ size_t upb_env_bytesallocated(const upb_env *e) {
 
 
 static const upb_msgdef msgs[22];
-static const upb_fielddef fields[105];
+static const upb_fielddef fields[107];
 static const upb_enumdef enums[5];
 static const upb_tabent strentries[236];
 static const upb_tabent intentries[18];
-static const upb_tabval arrays[184];
+static const upb_tabval arrays[187];
 
 #ifdef UPB_DEBUG_REFS
-static upb_inttable reftables[264];
+static upb_inttable reftables[268];
 #endif
 
 static const upb_msgdef msgs[22] = {
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto", 40, 8, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[0], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[0]), false, UPB_SYNTAX_PROTO2, &reftables[0], &reftables[1]),
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ExtensionRange", 4, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[11], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[16]), false, UPB_SYNTAX_PROTO2, &reftables[2], &reftables[3]),
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ReservedRange", 4, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[14], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[20]), false, UPB_SYNTAX_PROTO2, &reftables[4], &reftables[5]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumDescriptorProto", 11, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[17], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[24]), false, UPB_SYNTAX_PROTO2, &reftables[6], &reftables[7]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumOptions", 8, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[0], &arrays[21], 4, 2), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[28]), false, UPB_SYNTAX_PROTO2, &reftables[8], &reftables[9]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumValueDescriptorProto", 8, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[25], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[32]), false, UPB_SYNTAX_PROTO2, &reftables[10], &reftables[11]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumValueOptions", 7, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[2], &arrays[29], 2, 1), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[36]), false, UPB_SYNTAX_PROTO2, &reftables[12], &reftables[13]),
-  UPB_MSGDEF_INIT("google.protobuf.FieldDescriptorProto", 23, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[31], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[40]), false, UPB_SYNTAX_PROTO2, &reftables[14], &reftables[15]),
-  UPB_MSGDEF_INIT("google.protobuf.FieldOptions", 12, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[4], &arrays[42], 11, 6), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[56]), false, UPB_SYNTAX_PROTO2, &reftables[16], &reftables[17]),
-  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorProto", 42, 6, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[53], 13, 12), UPB_STRTABLE_INIT(12, 15, UPB_CTYPE_PTR, 4, &strentries[72]), false, UPB_SYNTAX_PROTO2, &reftables[18], &reftables[19]),
-  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorSet", 6, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[66], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[88]), false, UPB_SYNTAX_PROTO2, &reftables[20], &reftables[21]),
-  UPB_MSGDEF_INIT("google.protobuf.FileOptions", 31, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[6], &arrays[68], 39, 15), UPB_STRTABLE_INIT(16, 31, UPB_CTYPE_PTR, 5, &strentries[92]), false, UPB_SYNTAX_PROTO2, &reftables[22], &reftables[23]),
-  UPB_MSGDEF_INIT("google.protobuf.MessageOptions", 10, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[8], &arrays[107], 8, 4), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[124]), false, UPB_SYNTAX_PROTO2, &reftables[24], &reftables[25]),
-  UPB_MSGDEF_INIT("google.protobuf.MethodDescriptorProto", 15, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[115], 7, 6), UPB_STRTABLE_INIT(6, 7, UPB_CTYPE_PTR, 3, &strentries[132]), false, UPB_SYNTAX_PROTO2, &reftables[26], &reftables[27]),
-  UPB_MSGDEF_INIT("google.protobuf.MethodOptions", 7, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[10], &arrays[122], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[140]), false, UPB_SYNTAX_PROTO2, &reftables[28], &reftables[29]),
-  UPB_MSGDEF_INIT("google.protobuf.OneofDescriptorProto", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[123], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[144]), false, UPB_SYNTAX_PROTO2, &reftables[30], &reftables[31]),
-  UPB_MSGDEF_INIT("google.protobuf.ServiceDescriptorProto", 11, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[125], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[148]), false, UPB_SYNTAX_PROTO2, &reftables[32], &reftables[33]),
-  UPB_MSGDEF_INIT("google.protobuf.ServiceOptions", 7, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[14], &arrays[129], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[152]), false, UPB_SYNTAX_PROTO2, &reftables[34], &reftables[35]),
-  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo", 6, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[130], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[156]), false, UPB_SYNTAX_PROTO2, &reftables[36], &reftables[37]),
-  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo.Location", 19, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[132], 7, 5), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[160]), false, UPB_SYNTAX_PROTO2, &reftables[38], &reftables[39]),
-  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption", 18, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[139], 9, 7), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[168]), false, UPB_SYNTAX_PROTO2, &reftables[40], &reftables[41]),
-  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption.NamePart", 6, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[148], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[184]), false, UPB_SYNTAX_PROTO2, &reftables[42], &reftables[43]),
-};
-
-static const upb_fielddef fields[105] = {
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "aggregate_value", 8, &msgs[20], NULL, 15, 6, {0},&reftables[44], &reftables[45]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "allow_alias", 2, &msgs[4], NULL, 6, 1, {0},&reftables[46], &reftables[47]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_enable_arenas", 31, &msgs[11], NULL, 23, 12, {0},&reftables[48], &reftables[49]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_generic_services", 16, &msgs[11], NULL, 17, 6, {0},&reftables[50], &reftables[51]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "client_streaming", 5, &msgs[13], NULL, 13, 4, {0},&reftables[52], &reftables[53]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "csharp_namespace", 37, &msgs[11], NULL, 27, 14, {0},&reftables[54], &reftables[55]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "ctype", 1, &msgs[8], (const upb_def*)(&enums[2]), 6, 1, {0},&reftables[56], &reftables[57]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "default_value", 7, &msgs[7], NULL, 16, 7, {0},&reftables[58], &reftables[59]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "dependency", 3, &msgs[9], NULL, 30, 8, {0},&reftables[60], &reftables[61]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[12], NULL, 8, 3, {0},&reftables[62], &reftables[63]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[8], NULL, 8, 3, {0},&reftables[64], &reftables[65]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[14], NULL, 6, 1, {0},&reftables[66], &reftables[67]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 23, &msgs[11], NULL, 21, 10, {0},&reftables[68], &reftables[69]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[4], NULL, 7, 2, {0},&reftables[70], &reftables[71]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[17], NULL, 6, 1, {0},&reftables[72], &reftables[73]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 1, &msgs[6], NULL, 6, 1, {0},&reftables[74], &reftables[75]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, false, false, false, "double_value", 6, &msgs[20], NULL, 11, 4, {0},&reftables[76], &reftables[77]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[2], NULL, 3, 1, {0},&reftables[78], &reftables[79]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[1], NULL, 3, 1, {0},&reftables[80], &reftables[81]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 4, &msgs[0], (const upb_def*)(&msgs[3]), 18, 2, {0},&reftables[82], &reftables[83]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 5, &msgs[9], (const upb_def*)(&msgs[3]), 13, 1, {0},&reftables[84], &reftables[85]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "extendee", 2, &msgs[7], NULL, 7, 2, {0},&reftables[86], &reftables[87]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 6, &msgs[0], (const upb_def*)(&msgs[7]), 24, 4, {0},&reftables[88], &reftables[89]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 7, &msgs[9], (const upb_def*)(&msgs[7]), 19, 3, {0},&reftables[90], &reftables[91]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension_range", 5, &msgs[0], (const upb_def*)(&msgs[1]), 21, 3, {0},&reftables[92], &reftables[93]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "field", 2, &msgs[0], (const upb_def*)(&msgs[7]), 12, 0, {0},&reftables[94], &reftables[95]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "file", 1, &msgs[10], (const upb_def*)(&msgs[9]), 5, 0, {0},&reftables[96], &reftables[97]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "go_package", 11, &msgs[11], NULL, 14, 5, {0},&reftables[98], &reftables[99]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "identifier_value", 3, &msgs[20], NULL, 6, 1, {0},&reftables[100], &reftables[101]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "input_type", 2, &msgs[13], NULL, 7, 2, {0},&reftables[102], &reftables[103]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, false, false, false, "is_extension", 2, &msgs[21], NULL, 5, 1, {0},&reftables[104], &reftables[105]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generate_equals_and_hash", 20, &msgs[11], NULL, 20, 9, {0},&reftables[106], &reftables[107]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generic_services", 17, &msgs[11], NULL, 18, 7, {0},&reftables[108], &reftables[109]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_multiple_files", 10, &msgs[11], NULL, 13, 4, {0},&reftables[110], &reftables[111]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_outer_classname", 8, &msgs[11], NULL, 9, 2, {0},&reftables[112], &reftables[113]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_package", 1, &msgs[11], NULL, 6, 1, {0},&reftables[114], &reftables[115]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_string_check_utf8", 27, &msgs[11], NULL, 22, 11, {0},&reftables[116], &reftables[117]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "javanano_use_deprecated_package", 38, &msgs[11], NULL, 30, 15, {0},&reftables[118], &reftables[119]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "json_name", 10, &msgs[7], NULL, 20, 9, {0},&reftables[120], &reftables[121]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "jstype", 6, &msgs[8], (const upb_def*)(&enums[3]), 10, 5, {0},&reftables[122], &reftables[123]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "label", 4, &msgs[7], (const upb_def*)(&enums[0]), 11, 4, {0},&reftables[124], &reftables[125]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "lazy", 5, &msgs[8], NULL, 9, 4, {0},&reftables[126], &reftables[127]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "leading_comments", 3, &msgs[19], NULL, 8, 2, {0},&reftables[128], &reftables[129]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "leading_detached_comments", 6, &msgs[19], NULL, 16, 4, {0},&reftables[130], &reftables[131]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "location", 1, &msgs[18], (const upb_def*)(&msgs[19]), 5, 0, {0},&reftables[132], &reftables[133]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "map_entry", 7, &msgs[12], NULL, 9, 4, {0},&reftables[134], &reftables[135]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "message_set_wire_format", 1, &msgs[12], NULL, 6, 1, {0},&reftables[136], &reftables[137]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "message_type", 4, &msgs[9], (const upb_def*)(&msgs[0]), 10, 0, {0},&reftables[138], &reftables[139]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "method", 2, &msgs[16], (const upb_def*)(&msgs[13]), 6, 0, {0},&reftables[140], &reftables[141]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[3], NULL, 8, 2, {0},&reftables[142], &reftables[143]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[15], NULL, 2, 0, {0},&reftables[144], &reftables[145]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "name", 2, &msgs[20], (const upb_def*)(&msgs[21]), 5, 0, {0},&reftables[146], &reftables[147]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[0], NULL, 32, 8, {0},&reftables[148], &reftables[149]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[5], NULL, 4, 1, {0},&reftables[150], &reftables[151]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[9], NULL, 22, 6, {0},&reftables[152], &reftables[153]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[7], NULL, 4, 1, {0},&reftables[154], &reftables[155]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[13], NULL, 4, 1, {0},&reftables[156], &reftables[157]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[16], NULL, 8, 2, {0},&reftables[158], &reftables[159]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, false, false, false, "name_part", 1, &msgs[21], NULL, 2, 0, {0},&reftables[160], &reftables[161]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, false, false, false, "negative_int_value", 5, &msgs[20], NULL, 10, 3, {0},&reftables[162], &reftables[163]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "nested_type", 3, &msgs[0], (const upb_def*)(&msgs[0]), 15, 1, {0},&reftables[164], &reftables[165]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "no_standard_descriptor_accessor", 2, &msgs[12], NULL, 7, 2, {0},&reftables[166], &reftables[167]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 2, &msgs[5], NULL, 7, 2, {0},&reftables[168], &reftables[169]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 3, &msgs[7], NULL, 10, 3, {0},&reftables[170], &reftables[171]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "objc_class_prefix", 36, &msgs[11], NULL, 24, 13, {0},&reftables[172], &reftables[173]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "oneof_decl", 8, &msgs[0], (const upb_def*)(&msgs[15]), 28, 6, {0},&reftables[174], &reftables[175]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "oneof_index", 9, &msgs[7], NULL, 19, 8, {0},&reftables[176], &reftables[177]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "optimize_for", 9, &msgs[11], (const upb_def*)(&enums[4]), 12, 3, {0},&reftables[178], &reftables[179]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 7, &msgs[0], (const upb_def*)(&msgs[12]), 25, 5, {0},&reftables[180], &reftables[181]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[9], (const upb_def*)(&msgs[11]), 20, 4, {0},&reftables[182], &reftables[183]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 4, &msgs[13], (const upb_def*)(&msgs[14]), 3, 0, {0},&reftables[184], &reftables[185]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[7], (const upb_def*)(&msgs[8]), 3, 0, {0},&reftables[186], &reftables[187]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[16], (const upb_def*)(&msgs[17]), 7, 1, {0},&reftables[188], &reftables[189]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[5], (const upb_def*)(&msgs[6]), 3, 0, {0},&reftables[190], &reftables[191]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[3], (const upb_def*)(&msgs[4]), 7, 1, {0},&reftables[192], &reftables[193]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "output_type", 3, &msgs[13], NULL, 10, 3, {0},&reftables[194], &reftables[195]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "package", 2, &msgs[9], NULL, 25, 7, {0},&reftables[196], &reftables[197]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "packed", 2, &msgs[8], NULL, 7, 2, {0},&reftables[198], &reftables[199]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "path", 1, &msgs[19], NULL, 4, 0, {0},&reftables[200], &reftables[201]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, false, false, false, "positive_int_value", 4, &msgs[20], NULL, 9, 2, {0},&reftables[202], &reftables[203]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "public_dependency", 10, &msgs[9], NULL, 35, 9, {0},&reftables[204], &reftables[205]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "py_generic_services", 18, &msgs[11], NULL, 19, 8, {0},&reftables[206], &reftables[207]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "reserved_name", 10, &msgs[0], NULL, 37, 9, {0},&reftables[208], &reftables[209]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "reserved_range", 9, &msgs[0], (const upb_def*)(&msgs[2]), 31, 7, {0},&reftables[210], &reftables[211]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "server_streaming", 6, &msgs[13], NULL, 14, 5, {0},&reftables[212], &reftables[213]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "service", 6, &msgs[9], (const upb_def*)(&msgs[16]), 16, 2, {0},&reftables[214], &reftables[215]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "source_code_info", 9, &msgs[9], (const upb_def*)(&msgs[18]), 21, 5, {0},&reftables[216], &reftables[217]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "span", 2, &msgs[19], NULL, 7, 1, {0},&reftables[218], &reftables[219]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[2], NULL, 2, 0, {0},&reftables[220], &reftables[221]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[1], NULL, 2, 0, {0},&reftables[222], &reftables[223]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, false, false, false, "string_value", 7, &msgs[20], NULL, 12, 5, {0},&reftables[224], &reftables[225]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "syntax", 12, &msgs[9], NULL, 39, 11, {0},&reftables[226], &reftables[227]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "trailing_comments", 4, &msgs[19], NULL, 11, 3, {0},&reftables[228], &reftables[229]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "type", 5, &msgs[7], (const upb_def*)(&enums[1]), 12, 5, {0},&reftables[230], &reftables[231]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "type_name", 6, &msgs[7], NULL, 13, 6, {0},&reftables[232], &reftables[233]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[11], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[234], &reftables[235]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[12], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[236], &reftables[237]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[6], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[238], &reftables[239]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[4], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[240], &reftables[241]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[8], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[242], &reftables[243]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[14], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[244], &reftables[245]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[17], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[246], &reftables[247]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "value", 2, &msgs[3], (const upb_def*)(&msgs[5]), 6, 0, {0},&reftables[248], &reftables[249]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "weak", 10, &msgs[8], NULL, 11, 6, {0},&reftables[250], &reftables[251]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "weak_dependency", 11, &msgs[9], NULL, 38, 10, {0},&reftables[252], &reftables[253]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto", 41, 8, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[0], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[0]), false, UPB_SYNTAX_PROTO2, &reftables[0], &reftables[1]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ExtensionRange", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[11], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[16]), false, UPB_SYNTAX_PROTO2, &reftables[2], &reftables[3]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ReservedRange", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[14], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[20]), false, UPB_SYNTAX_PROTO2, &reftables[4], &reftables[5]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumDescriptorProto", 12, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[17], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[24]), false, UPB_SYNTAX_PROTO2, &reftables[6], &reftables[7]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumOptions", 9, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[0], &arrays[21], 4, 2), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[28]), false, UPB_SYNTAX_PROTO2, &reftables[8], &reftables[9]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumValueDescriptorProto", 9, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[25], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[32]), false, UPB_SYNTAX_PROTO2, &reftables[10], &reftables[11]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumValueOptions", 8, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[2], &arrays[29], 2, 1), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[36]), false, UPB_SYNTAX_PROTO2, &reftables[12], &reftables[13]),
+  UPB_MSGDEF_INIT("google.protobuf.FieldDescriptorProto", 24, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[31], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[40]), false, UPB_SYNTAX_PROTO2, &reftables[14], &reftables[15]),
+  UPB_MSGDEF_INIT("google.protobuf.FieldOptions", 13, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[4], &arrays[42], 11, 6), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[56]), false, UPB_SYNTAX_PROTO2, &reftables[16], &reftables[17]),
+  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorProto", 43, 6, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[53], 13, 12), UPB_STRTABLE_INIT(12, 15, UPB_CTYPE_PTR, 4, &strentries[72]), false, UPB_SYNTAX_PROTO2, &reftables[18], &reftables[19]),
+  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorSet", 7, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[66], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[88]), false, UPB_SYNTAX_PROTO2, &reftables[20], &reftables[21]),
+  UPB_MSGDEF_INIT("google.protobuf.FileOptions", 38, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[6], &arrays[68], 42, 17), UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_PTR, 5, &strentries[92]), false, UPB_SYNTAX_PROTO2, &reftables[22], &reftables[23]),
+  UPB_MSGDEF_INIT("google.protobuf.MessageOptions", 11, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[8], &arrays[110], 8, 4), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[124]), false, UPB_SYNTAX_PROTO2, &reftables[24], &reftables[25]),
+  UPB_MSGDEF_INIT("google.protobuf.MethodDescriptorProto", 16, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[118], 7, 6), UPB_STRTABLE_INIT(6, 7, UPB_CTYPE_PTR, 3, &strentries[132]), false, UPB_SYNTAX_PROTO2, &reftables[26], &reftables[27]),
+  UPB_MSGDEF_INIT("google.protobuf.MethodOptions", 8, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[10], &arrays[125], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[140]), false, UPB_SYNTAX_PROTO2, &reftables[28], &reftables[29]),
+  UPB_MSGDEF_INIT("google.protobuf.OneofDescriptorProto", 6, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[126], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[144]), false, UPB_SYNTAX_PROTO2, &reftables[30], &reftables[31]),
+  UPB_MSGDEF_INIT("google.protobuf.ServiceDescriptorProto", 12, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[128], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[148]), false, UPB_SYNTAX_PROTO2, &reftables[32], &reftables[33]),
+  UPB_MSGDEF_INIT("google.protobuf.ServiceOptions", 8, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[14], &arrays[132], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[152]), false, UPB_SYNTAX_PROTO2, &reftables[34], &reftables[35]),
+  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo", 7, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[133], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[156]), false, UPB_SYNTAX_PROTO2, &reftables[36], &reftables[37]),
+  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo.Location", 20, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[135], 7, 5), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[160]), false, UPB_SYNTAX_PROTO2, &reftables[38], &reftables[39]),
+  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption", 19, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[142], 9, 7), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[168]), false, UPB_SYNTAX_PROTO2, &reftables[40], &reftables[41]),
+  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption.NamePart", 7, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[151], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[184]), false, UPB_SYNTAX_PROTO2, &reftables[42], &reftables[43]),
+};
+
+static const upb_fielddef fields[107] = {
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "aggregate_value", 8, &msgs[20], NULL, 16, 6, {0},&reftables[44], &reftables[45]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "allow_alias", 2, &msgs[4], NULL, 7, 1, {0},&reftables[46], &reftables[47]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_enable_arenas", 31, &msgs[11], NULL, 24, 12, {0},&reftables[48], &reftables[49]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_generic_services", 16, &msgs[11], NULL, 18, 6, {0},&reftables[50], &reftables[51]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "client_streaming", 5, &msgs[13], NULL, 14, 4, {0},&reftables[52], &reftables[53]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "csharp_namespace", 37, &msgs[11], NULL, 28, 14, {0},&reftables[54], &reftables[55]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "ctype", 1, &msgs[8], (const upb_def*)(&enums[2]), 7, 1, {0},&reftables[56], &reftables[57]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "default_value", 7, &msgs[7], NULL, 17, 7, {0},&reftables[58], &reftables[59]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "dependency", 3, &msgs[9], NULL, 31, 8, {0},&reftables[60], &reftables[61]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[8], NULL, 9, 3, {0},&reftables[62], &reftables[63]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[14], NULL, 7, 1, {0},&reftables[64], &reftables[65]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[12], NULL, 9, 3, {0},&reftables[66], &reftables[67]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 23, &msgs[11], NULL, 22, 10, {0},&reftables[68], &reftables[69]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 1, &msgs[6], NULL, 7, 1, {0},&reftables[70], &reftables[71]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[4], NULL, 8, 2, {0},&reftables[72], &reftables[73]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[17], NULL, 7, 1, {0},&reftables[74], &reftables[75]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, false, false, false, "double_value", 6, &msgs[20], NULL, 12, 4, {0},&reftables[76], &reftables[77]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[2], NULL, 4, 1, {0},&reftables[78], &reftables[79]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[1], NULL, 4, 1, {0},&reftables[80], &reftables[81]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 5, &msgs[9], (const upb_def*)(&msgs[3]), 14, 1, {0},&reftables[82], &reftables[83]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 4, &msgs[0], (const upb_def*)(&msgs[3]), 19, 2, {0},&reftables[84], &reftables[85]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "extendee", 2, &msgs[7], NULL, 8, 2, {0},&reftables[86], &reftables[87]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 6, &msgs[0], (const upb_def*)(&msgs[7]), 25, 4, {0},&reftables[88], &reftables[89]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 7, &msgs[9], (const upb_def*)(&msgs[7]), 20, 3, {0},&reftables[90], &reftables[91]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension_range", 5, &msgs[0], (const upb_def*)(&msgs[1]), 22, 3, {0},&reftables[92], &reftables[93]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "field", 2, &msgs[0], (const upb_def*)(&msgs[7]), 13, 0, {0},&reftables[94], &reftables[95]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "file", 1, &msgs[10], (const upb_def*)(&msgs[9]), 6, 0, {0},&reftables[96], &reftables[97]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "go_package", 11, &msgs[11], NULL, 15, 5, {0},&reftables[98], &reftables[99]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "identifier_value", 3, &msgs[20], NULL, 7, 1, {0},&reftables[100], &reftables[101]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "input_type", 2, &msgs[13], NULL, 8, 2, {0},&reftables[102], &reftables[103]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, false, false, false, "is_extension", 2, &msgs[21], NULL, 6, 1, {0},&reftables[104], &reftables[105]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generate_equals_and_hash", 20, &msgs[11], NULL, 21, 9, {0},&reftables[106], &reftables[107]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generic_services", 17, &msgs[11], NULL, 19, 7, {0},&reftables[108], &reftables[109]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_multiple_files", 10, &msgs[11], NULL, 14, 4, {0},&reftables[110], &reftables[111]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_outer_classname", 8, &msgs[11], NULL, 10, 2, {0},&reftables[112], &reftables[113]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_package", 1, &msgs[11], NULL, 7, 1, {0},&reftables[114], &reftables[115]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_string_check_utf8", 27, &msgs[11], NULL, 23, 11, {0},&reftables[116], &reftables[117]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "javanano_use_deprecated_package", 38, &msgs[11], NULL, 31, 15, {0},&reftables[118], &reftables[119]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "json_name", 10, &msgs[7], NULL, 21, 9, {0},&reftables[120], &reftables[121]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "jstype", 6, &msgs[8], (const upb_def*)(&enums[3]), 11, 5, {0},&reftables[122], &reftables[123]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "label", 4, &msgs[7], (const upb_def*)(&enums[0]), 12, 4, {0},&reftables[124], &reftables[125]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "lazy", 5, &msgs[8], NULL, 10, 4, {0},&reftables[126], &reftables[127]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "leading_comments", 3, &msgs[19], NULL, 9, 2, {0},&reftables[128], &reftables[129]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "leading_detached_comments", 6, &msgs[19], NULL, 17, 4, {0},&reftables[130], &reftables[131]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "location", 1, &msgs[18], (const upb_def*)(&msgs[19]), 6, 0, {0},&reftables[132], &reftables[133]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "map_entry", 7, &msgs[12], NULL, 10, 4, {0},&reftables[134], &reftables[135]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "message_set_wire_format", 1, &msgs[12], NULL, 7, 1, {0},&reftables[136], &reftables[137]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "message_type", 4, &msgs[9], (const upb_def*)(&msgs[0]), 11, 0, {0},&reftables[138], &reftables[139]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "method", 2, &msgs[16], (const upb_def*)(&msgs[13]), 7, 0, {0},&reftables[140], &reftables[141]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "name", 2, &msgs[20], (const upb_def*)(&msgs[21]), 6, 0, {0},&reftables[142], &reftables[143]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[5], NULL, 5, 1, {0},&reftables[144], &reftables[145]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[9], NULL, 23, 6, {0},&reftables[146], &reftables[147]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[3], NULL, 9, 2, {0},&reftables[148], &reftables[149]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[16], NULL, 9, 2, {0},&reftables[150], &reftables[151]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[15], NULL, 3, 0, {0},&reftables[152], &reftables[153]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[13], NULL, 5, 1, {0},&reftables[154], &reftables[155]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[7], NULL, 5, 1, {0},&reftables[156], &reftables[157]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[0], NULL, 33, 8, {0},&reftables[158], &reftables[159]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, false, false, false, "name_part", 1, &msgs[21], NULL, 3, 0, {0},&reftables[160], &reftables[161]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, false, false, false, "negative_int_value", 5, &msgs[20], NULL, 11, 3, {0},&reftables[162], &reftables[163]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "nested_type", 3, &msgs[0], (const upb_def*)(&msgs[0]), 16, 1, {0},&reftables[164], &reftables[165]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "no_standard_descriptor_accessor", 2, &msgs[12], NULL, 8, 2, {0},&reftables[166], &reftables[167]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 3, &msgs[7], NULL, 11, 3, {0},&reftables[168], &reftables[169]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 2, &msgs[5], NULL, 8, 2, {0},&reftables[170], &reftables[171]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "objc_class_prefix", 36, &msgs[11], NULL, 25, 13, {0},&reftables[172], &reftables[173]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "oneof_decl", 8, &msgs[0], (const upb_def*)(&msgs[15]), 29, 6, {0},&reftables[174], &reftables[175]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "oneof_index", 9, &msgs[7], NULL, 20, 8, {0},&reftables[176], &reftables[177]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "optimize_for", 9, &msgs[11], (const upb_def*)(&enums[4]), 13, 3, {0},&reftables[178], &reftables[179]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 7, &msgs[0], (const upb_def*)(&msgs[12]), 26, 5, {0},&reftables[180], &reftables[181]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[9], (const upb_def*)(&msgs[11]), 21, 4, {0},&reftables[182], &reftables[183]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[7], (const upb_def*)(&msgs[8]), 4, 0, {0},&reftables[184], &reftables[185]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 4, &msgs[13], (const upb_def*)(&msgs[14]), 4, 0, {0},&reftables[186], &reftables[187]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[16], (const upb_def*)(&msgs[17]), 8, 1, {0},&reftables[188], &reftables[189]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[3], (const upb_def*)(&msgs[4]), 8, 1, {0},&reftables[190], &reftables[191]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[5], (const upb_def*)(&msgs[6]), 4, 0, {0},&reftables[192], &reftables[193]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "output_type", 3, &msgs[13], NULL, 11, 3, {0},&reftables[194], &reftables[195]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "package", 2, &msgs[9], NULL, 26, 7, {0},&reftables[196], &reftables[197]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "packed", 2, &msgs[8], NULL, 8, 2, {0},&reftables[198], &reftables[199]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "path", 1, &msgs[19], NULL, 5, 0, {0},&reftables[200], &reftables[201]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "php_class_prefix", 40, &msgs[11], NULL, 32, 16, {0},&reftables[202], &reftables[203]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "php_namespace", 41, &msgs[11], NULL, 35, 17, {0},&reftables[204], &reftables[205]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, false, false, false, "positive_int_value", 4, &msgs[20], NULL, 10, 2, {0},&reftables[206], &reftables[207]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "public_dependency", 10, &msgs[9], NULL, 36, 9, {0},&reftables[208], &reftables[209]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "py_generic_services", 18, &msgs[11], NULL, 20, 8, {0},&reftables[210], &reftables[211]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "reserved_name", 10, &msgs[0], NULL, 38, 9, {0},&reftables[212], &reftables[213]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "reserved_range", 9, &msgs[0], (const upb_def*)(&msgs[2]), 32, 7, {0},&reftables[214], &reftables[215]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "server_streaming", 6, &msgs[13], NULL, 15, 5, {0},&reftables[216], &reftables[217]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "service", 6, &msgs[9], (const upb_def*)(&msgs[16]), 17, 2, {0},&reftables[218], &reftables[219]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "source_code_info", 9, &msgs[9], (const upb_def*)(&msgs[18]), 22, 5, {0},&reftables[220], &reftables[221]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "span", 2, &msgs[19], NULL, 8, 1, {0},&reftables[222], &reftables[223]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[2], NULL, 3, 0, {0},&reftables[224], &reftables[225]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[1], NULL, 3, 0, {0},&reftables[226], &reftables[227]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, false, false, false, "string_value", 7, &msgs[20], NULL, 13, 5, {0},&reftables[228], &reftables[229]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "syntax", 12, &msgs[9], NULL, 40, 11, {0},&reftables[230], &reftables[231]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "trailing_comments", 4, &msgs[19], NULL, 12, 3, {0},&reftables[232], &reftables[233]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "type", 5, &msgs[7], (const upb_def*)(&enums[1]), 13, 5, {0},&reftables[234], &reftables[235]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "type_name", 6, &msgs[7], NULL, 14, 6, {0},&reftables[236], &reftables[237]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[12], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[238], &reftables[239]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[17], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[240], &reftables[241]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[11], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[242], &reftables[243]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[14], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[244], &reftables[245]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[8], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[246], &reftables[247]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[6], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[248], &reftables[249]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[4], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[250], &reftables[251]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "value", 2, &msgs[3], (const upb_def*)(&msgs[5]), 7, 0, {0},&reftables[252], &reftables[253]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "weak", 10, &msgs[8], NULL, 12, 6, {0},&reftables[254], &reftables[255]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "weak_dependency", 11, &msgs[9], NULL, 39, 10, {0},&reftables[256], &reftables[257]),
 };
 
 static const upb_enumdef enums[5] = {
-  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Label", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[188]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[151], 4, 3), 0, &reftables[254], &reftables[255]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Type", UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_INT32, 5, &strentries[192]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[155], 19, 18), 0, &reftables[256], &reftables[257]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.CType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[224]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[174], 3, 3), 0, &reftables[258], &reftables[259]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.JSType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[228]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[177], 3, 3), 0, &reftables[260], &reftables[261]),
-  UPB_ENUMDEF_INIT("google.protobuf.FileOptions.OptimizeMode", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[232]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[180], 4, 3), 0, &reftables[262], &reftables[263]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Label", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[188]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[154], 4, 3), 0, &reftables[258], &reftables[259]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Type", UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_INT32, 5, &strentries[192]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[158], 19, 18), 0, &reftables[260], &reftables[261]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.CType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[224]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[177], 3, 3), 0, &reftables[262], &reftables[263]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.JSType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[228]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[180], 3, 3), 0, &reftables[264], &reftables[265]),
+  UPB_ENUMDEF_INIT("google.protobuf.FileOptions.OptimizeMode", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[232]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[183], 4, 3), 0, &reftables[266], &reftables[267]),
 };
 
 static const upb_tabent strentries[236] = {
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "extension"), UPB_TABVALUE_PTR_INIT(&fields[22]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "reserved_name"), UPB_TABVALUE_PTR_INIT(&fields[82]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[52]), NULL},
+  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "reserved_name"), UPB_TABVALUE_PTR_INIT(&fields[84]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[57]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6709,53 +9500,53 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "nested_type"), UPB_TABVALUE_PTR_INIT(&fields[60]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\016", "\000", "\000", "\000", "reserved_range"), UPB_TABVALUE_PTR_INIT(&fields[83]), NULL},
+  {UPB_TABKEY_STR("\016", "\000", "\000", "\000", "reserved_range"), UPB_TABVALUE_PTR_INIT(&fields[85]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[68]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "oneof_decl"), UPB_TABVALUE_PTR_INIT(&fields[65]), NULL},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[19]), &strentries[13]},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[89]), NULL},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[20]), &strentries[13]},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[91]), NULL},
   {UPB_TABKEY_STR("\003", "\000", "\000", "\000", "end"), UPB_TABVALUE_PTR_INIT(&fields[18]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[88]), NULL},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[90]), NULL},
   {UPB_TABKEY_STR("\003", "\000", "\000", "\000", "end"), UPB_TABVALUE_PTR_INIT(&fields[17]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "value"), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[74]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[49]), &strentries[26]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[13]), NULL},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "value"), UPB_TABVALUE_PTR_INIT(&fields[104]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[73]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[52]), &strentries[26]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "allow_alias"), UPB_TABVALUE_PTR_INIT(&fields[1]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[62]), NULL},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[63]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[73]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[53]), &strentries[34]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[74]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[50]), &strentries[34]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[13]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "oneof_index"), UPB_TABVALUE_PTR_INIT(&fields[66]), NULL},
   {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "label"), UPB_TABVALUE_PTR_INIT(&fields[40]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[55]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[56]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[63]), &strentries[53]},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[62]), &strentries[53]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\010", "\000", "\000", "\000", "extendee"), UPB_TABVALUE_PTR_INIT(&fields[21]), NULL},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "type_name"), UPB_TABVALUE_PTR_INIT(&fields[94]), NULL},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "type_name"), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "json_name"), UPB_TABVALUE_PTR_INIT(&fields[38]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "type"), UPB_TABVALUE_PTR_INIT(&fields[93]), &strentries[50]},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "type"), UPB_TABVALUE_PTR_INIT(&fields[95]), &strentries[50]},
   {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "default_value"), UPB_TABVALUE_PTR_INIT(&fields[7]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[71]), NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[70]), NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "weak"), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "weak"), UPB_TABVALUE_PTR_INIT(&fields[105]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6766,25 +9557,25 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "ctype"), UPB_TABVALUE_PTR_INIT(&fields[6]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "jstype"), UPB_TABVALUE_PTR_INIT(&fields[39]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[9]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "extension"), UPB_TABVALUE_PTR_INIT(&fields[23]), NULL},
-  {UPB_TABKEY_STR("\017", "\000", "\000", "\000", "weak_dependency"), UPB_TABVALUE_PTR_INIT(&fields[104]), NULL},
+  {UPB_TABKEY_STR("\017", "\000", "\000", "\000", "weak_dependency"), UPB_TABVALUE_PTR_INIT(&fields[106]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[54]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "service"), UPB_TABVALUE_PTR_INIT(&fields[85]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[51]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "service"), UPB_TABVALUE_PTR_INIT(&fields[87]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "source_code_info"), UPB_TABVALUE_PTR_INIT(&fields[86]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "source_code_info"), UPB_TABVALUE_PTR_INIT(&fields[88]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "syntax"), UPB_TABVALUE_PTR_INIT(&fields[91]), NULL},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "syntax"), UPB_TABVALUE_PTR_INIT(&fields[93]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "dependency"), UPB_TABVALUE_PTR_INIT(&fields[8]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "message_type"), UPB_TABVALUE_PTR_INIT(&fields[47]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "package"), UPB_TABVALUE_PTR_INIT(&fields[76]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[69]), &strentries[86]},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[20]), NULL},
-  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "public_dependency"), UPB_TABVALUE_PTR_INIT(&fields[80]), &strentries[85]},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[19]), NULL},
+  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "public_dependency"), UPB_TABVALUE_PTR_INIT(&fields[82]), &strentries[85]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "file"), UPB_TABVALUE_PTR_INIT(&fields[26]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6792,7 +9583,7 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "cc_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[3]), NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "csharp_namespace"), UPB_TABVALUE_PTR_INIT(&fields[5]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "csharp_namespace"), UPB_TABVALUE_PTR_INIT(&fields[5]), &strentries[116]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6805,17 +9596,17 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "java_outer_classname"), UPB_TABVALUE_PTR_INIT(&fields[34]), NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[95]), NULL},
+  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "php_namespace"), UPB_TABVALUE_PTR_INIT(&fields[80]), &strentries[113]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "java_multiple_files"), UPB_TABVALUE_PTR_INIT(&fields[33]), &strentries[117]},
-  {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
   {UPB_TABKEY_STR("\025", "\000", "\000", "\000", "java_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[32]), &strentries[118]},
   {UPB_TABKEY_STR("\035", "\000", "\000", "\000", "java_generate_equals_and_hash"), UPB_TABVALUE_PTR_INIT(&fields[31]), NULL},
-  {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "php_class_prefix"), UPB_TABVALUE_PTR_INIT(&fields[79]), NULL},
   {UPB_TABKEY_STR("\037", "\000", "\000", "\000", "javanano_use_deprecated_package"), UPB_TABVALUE_PTR_INIT(&fields[37]), &strentries[123]},
-  {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "py_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[81]), NULL},
+  {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "py_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[83]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "optimize_for"), UPB_TABVALUE_PTR_INIT(&fields[67]), NULL},
   {UPB_TABKEY_STR("\026", "\000", "\000", "\000", "java_string_check_utf8"), UPB_TABVALUE_PTR_INIT(&fields[36]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[12]), &strentries[119]},
@@ -6825,32 +9616,32 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[9]), NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "map_entry"), UPB_TABVALUE_PTR_INIT(&fields[45]), NULL},
   {UPB_TABKEY_STR("\037", "\000", "\000", "\000", "no_standard_descriptor_accessor"), UPB_TABVALUE_PTR_INIT(&fields[61]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "client_streaming"), UPB_TABVALUE_PTR_INIT(&fields[4]), NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "server_streaming"), UPB_TABVALUE_PTR_INIT(&fields[84]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[56]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "server_streaming"), UPB_TABVALUE_PTR_INIT(&fields[86]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[55]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "input_type"), UPB_TABVALUE_PTR_INIT(&fields[29]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "output_type"), UPB_TABVALUE_PTR_INIT(&fields[75]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[70]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[71]), NULL},
   {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[100]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[50]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[54]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[72]), &strentries[150]},
   {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "method"), UPB_TABVALUE_PTR_INIT(&fields[48]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[57]), &strentries[149]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[53]), &strentries[149]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6860,15 +9651,15 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "span"), UPB_TABVALUE_PTR_INIT(&fields[87]), &strentries[167]},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "span"), UPB_TABVALUE_PTR_INIT(&fields[89]), &strentries[167]},
   {UPB_TABKEY_STR("\031", "\000", "\000", "\000", "leading_detached_comments"), UPB_TABVALUE_PTR_INIT(&fields[43]), &strentries[165]},
-  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "trailing_comments"), UPB_TABVALUE_PTR_INIT(&fields[92]), NULL},
+  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "trailing_comments"), UPB_TABVALUE_PTR_INIT(&fields[94]), NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "leading_comments"), UPB_TABVALUE_PTR_INIT(&fields[42]), &strentries[164]},
   {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "path"), UPB_TABVALUE_PTR_INIT(&fields[78]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "double_value"), UPB_TABVALUE_PTR_INIT(&fields[16]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[51]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[49]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6878,9 +9669,9 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\022", "\000", "\000", "\000", "positive_int_value"), UPB_TABVALUE_PTR_INIT(&fields[79]), NULL},
+  {UPB_TABKEY_STR("\022", "\000", "\000", "\000", "positive_int_value"), UPB_TABVALUE_PTR_INIT(&fields[81]), NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "identifier_value"), UPB_TABVALUE_PTR_INIT(&fields[28]), NULL},
-  {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "string_value"), UPB_TABVALUE_PTR_INIT(&fields[90]), &strentries[182]},
+  {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "string_value"), UPB_TABVALUE_PTR_INIT(&fields[92]), &strentries[182]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "is_extension"), UPB_TABVALUE_PTR_INIT(&fields[30]), NULL},
@@ -6937,92 +9728,92 @@ static const upb_tabent strentries[236] = {
 
 static const upb_tabent intentries[18] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[95]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
+  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[100]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
+  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
 };
 
-static const upb_tabval arrays[184] = {
+static const upb_tabval arrays[187] = {
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[52]),
+  UPB_TABVALUE_PTR_INIT(&fields[57]),
   UPB_TABVALUE_PTR_INIT(&fields[25]),
   UPB_TABVALUE_PTR_INIT(&fields[60]),
-  UPB_TABVALUE_PTR_INIT(&fields[19]),
+  UPB_TABVALUE_PTR_INIT(&fields[20]),
   UPB_TABVALUE_PTR_INIT(&fields[24]),
   UPB_TABVALUE_PTR_INIT(&fields[22]),
   UPB_TABVALUE_PTR_INIT(&fields[68]),
   UPB_TABVALUE_PTR_INIT(&fields[65]),
-  UPB_TABVALUE_PTR_INIT(&fields[83]),
-  UPB_TABVALUE_PTR_INIT(&fields[82]),
+  UPB_TABVALUE_PTR_INIT(&fields[85]),
+  UPB_TABVALUE_PTR_INIT(&fields[84]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[89]),
+  UPB_TABVALUE_PTR_INIT(&fields[91]),
   UPB_TABVALUE_PTR_INIT(&fields[18]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[88]),
+  UPB_TABVALUE_PTR_INIT(&fields[90]),
   UPB_TABVALUE_PTR_INIT(&fields[17]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[49]),
-  UPB_TABVALUE_PTR_INIT(&fields[102]),
-  UPB_TABVALUE_PTR_INIT(&fields[74]),
+  UPB_TABVALUE_PTR_INIT(&fields[52]),
+  UPB_TABVALUE_PTR_INIT(&fields[104]),
+  UPB_TABVALUE_PTR_INIT(&fields[73]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[1]),
-  UPB_TABVALUE_PTR_INIT(&fields[13]),
+  UPB_TABVALUE_PTR_INIT(&fields[14]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[53]),
-  UPB_TABVALUE_PTR_INIT(&fields[62]),
-  UPB_TABVALUE_PTR_INIT(&fields[73]),
+  UPB_TABVALUE_PTR_INIT(&fields[50]),
+  UPB_TABVALUE_PTR_INIT(&fields[63]),
+  UPB_TABVALUE_PTR_INIT(&fields[74]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[15]),
+  UPB_TABVALUE_PTR_INIT(&fields[13]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[55]),
+  UPB_TABVALUE_PTR_INIT(&fields[56]),
   UPB_TABVALUE_PTR_INIT(&fields[21]),
-  UPB_TABVALUE_PTR_INIT(&fields[63]),
+  UPB_TABVALUE_PTR_INIT(&fields[62]),
   UPB_TABVALUE_PTR_INIT(&fields[40]),
-  UPB_TABVALUE_PTR_INIT(&fields[93]),
-  UPB_TABVALUE_PTR_INIT(&fields[94]),
+  UPB_TABVALUE_PTR_INIT(&fields[95]),
+  UPB_TABVALUE_PTR_INIT(&fields[96]),
   UPB_TABVALUE_PTR_INIT(&fields[7]),
-  UPB_TABVALUE_PTR_INIT(&fields[71]),
+  UPB_TABVALUE_PTR_INIT(&fields[70]),
   UPB_TABVALUE_PTR_INIT(&fields[66]),
   UPB_TABVALUE_PTR_INIT(&fields[38]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[6]),
   UPB_TABVALUE_PTR_INIT(&fields[77]),
-  UPB_TABVALUE_PTR_INIT(&fields[10]),
+  UPB_TABVALUE_PTR_INIT(&fields[9]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[41]),
   UPB_TABVALUE_PTR_INIT(&fields[39]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[103]),
+  UPB_TABVALUE_PTR_INIT(&fields[105]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[54]),
+  UPB_TABVALUE_PTR_INIT(&fields[51]),
   UPB_TABVALUE_PTR_INIT(&fields[76]),
   UPB_TABVALUE_PTR_INIT(&fields[8]),
   UPB_TABVALUE_PTR_INIT(&fields[47]),
-  UPB_TABVALUE_PTR_INIT(&fields[20]),
-  UPB_TABVALUE_PTR_INIT(&fields[85]),
+  UPB_TABVALUE_PTR_INIT(&fields[19]),
+  UPB_TABVALUE_PTR_INIT(&fields[87]),
   UPB_TABVALUE_PTR_INIT(&fields[23]),
   UPB_TABVALUE_PTR_INIT(&fields[69]),
-  UPB_TABVALUE_PTR_INIT(&fields[86]),
-  UPB_TABVALUE_PTR_INIT(&fields[80]),
-  UPB_TABVALUE_PTR_INIT(&fields[104]),
-  UPB_TABVALUE_PTR_INIT(&fields[91]),
+  UPB_TABVALUE_PTR_INIT(&fields[88]),
+  UPB_TABVALUE_PTR_INIT(&fields[82]),
+  UPB_TABVALUE_PTR_INIT(&fields[106]),
+  UPB_TABVALUE_PTR_INIT(&fields[93]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[26]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7043,7 +9834,7 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[3]),
   UPB_TABVALUE_PTR_INIT(&fields[32]),
-  UPB_TABVALUE_PTR_INIT(&fields[81]),
+  UPB_TABVALUE_PTR_INIT(&fields[83]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[31]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7065,25 +9856,28 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_PTR_INIT(&fields[5]),
   UPB_TABVALUE_PTR_INIT(&fields[37]),
   UPB_TABVALUE_EMPTY_INIT,
+  UPB_TABVALUE_PTR_INIT(&fields[79]),
+  UPB_TABVALUE_PTR_INIT(&fields[80]),
+  UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[46]),
   UPB_TABVALUE_PTR_INIT(&fields[61]),
-  UPB_TABVALUE_PTR_INIT(&fields[9]),
+  UPB_TABVALUE_PTR_INIT(&fields[11]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[45]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[56]),
+  UPB_TABVALUE_PTR_INIT(&fields[55]),
   UPB_TABVALUE_PTR_INIT(&fields[29]),
   UPB_TABVALUE_PTR_INIT(&fields[75]),
-  UPB_TABVALUE_PTR_INIT(&fields[70]),
+  UPB_TABVALUE_PTR_INIT(&fields[71]),
   UPB_TABVALUE_PTR_INIT(&fields[4]),
-  UPB_TABVALUE_PTR_INIT(&fields[84]),
+  UPB_TABVALUE_PTR_INIT(&fields[86]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[50]),
+  UPB_TABVALUE_PTR_INIT(&fields[54]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[57]),
+  UPB_TABVALUE_PTR_INIT(&fields[53]),
   UPB_TABVALUE_PTR_INIT(&fields[48]),
   UPB_TABVALUE_PTR_INIT(&fields[72]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7091,19 +9885,19 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_PTR_INIT(&fields[44]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[78]),
-  UPB_TABVALUE_PTR_INIT(&fields[87]),
+  UPB_TABVALUE_PTR_INIT(&fields[89]),
   UPB_TABVALUE_PTR_INIT(&fields[42]),
-  UPB_TABVALUE_PTR_INIT(&fields[92]),
+  UPB_TABVALUE_PTR_INIT(&fields[94]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[43]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[51]),
+  UPB_TABVALUE_PTR_INIT(&fields[49]),
   UPB_TABVALUE_PTR_INIT(&fields[28]),
-  UPB_TABVALUE_PTR_INIT(&fields[79]),
+  UPB_TABVALUE_PTR_INIT(&fields[81]),
   UPB_TABVALUE_PTR_INIT(&fields[59]),
   UPB_TABVALUE_PTR_INIT(&fields[16]),
-  UPB_TABVALUE_PTR_INIT(&fields[90]),
+  UPB_TABVALUE_PTR_INIT(&fields[92]),
   UPB_TABVALUE_PTR_INIT(&fields[0]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[58]),
@@ -7144,7 +9938,11 @@ static const upb_tabval arrays[184] = {
 };
 
 #ifdef UPB_DEBUG_REFS
-static upb_inttable reftables[264] = {
+static upb_inttable reftables[268] = {
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
@@ -7497,6 +10295,7 @@ typedef struct {
 struct upb_descreader {
   upb_sink sink;
   upb_inttable files;
+  upb_strtable files_by_name;
   upb_filedef *file;  /* The last file in files. */
   upb_descreader_frame stack[UPB_MAX_MESSAGE_NESTING];
   int stack_len;
@@ -7663,6 +10462,7 @@ static size_t file_onname(void *closure, const void *hd, const char *buf,
   UPB_UNUSED(handle);
 
   name = upb_gstrndup(buf, n);
+  upb_strtable_insert(&r->files_by_name, name, upb_value_ptr(r->file));
   /* XXX: see comment at the top of the file. */
   ok = upb_filedef_setname(r->file, name, NULL);
   upb_gfree(name);
@@ -7686,6 +10486,49 @@ static size_t file_onpackage(void *closure, const void *hd, const char *buf,
   return n;
 }
 
+static void *file_startphpnamespace(void *closure, const void *hd,
+                                    size_t size_hint) {
+  upb_descreader *r = closure;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(size_hint);
+
+  ok = upb_filedef_setphpnamespace(r->file, "", NULL);
+  UPB_ASSERT(ok);
+  return closure;
+}
+
+static size_t file_onphpnamespace(void *closure, const void *hd,
+                                  const char *buf, size_t n,
+                                  const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  char *php_namespace;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+
+  php_namespace = upb_gstrndup(buf, n);
+  ok = upb_filedef_setphpnamespace(r->file, php_namespace, NULL);
+  upb_gfree(php_namespace);
+  UPB_ASSERT(ok);
+  return n;
+}
+
+static size_t file_onphpprefix(void *closure, const void *hd, const char *buf,
+                             size_t n, const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  char *prefix;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+
+  prefix = upb_gstrndup(buf, n);
+  ok = upb_filedef_setphpprefix(r->file, prefix, NULL);
+  upb_gfree(prefix);
+  UPB_ASSERT(ok);
+  return n;
+}
+
 static size_t file_onsyntax(void *closure, const void *hd, const char *buf,
                             size_t n, const upb_bufhandle *handle) {
   upb_descreader *r = closure;
@@ -7733,6 +10576,18 @@ static void *file_startext(void *closure, const void *hd) {
   return r;
 }
 
+static size_t file_ondep(void *closure, const void *hd, const char *buf,
+                         size_t n, const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  upb_value val;
+  if (upb_strtable_lookup2(&r->files_by_name, buf, n, &val)) {
+    upb_filedef_adddep(r->file, upb_value_getptr(val));
+  }
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+  return n;
+}
+
 /** Handlers for google.protobuf.EnumValueDescriptorProto. *********************/
 
 static bool enumval_startmsg(void *closure, const void *hd) {
@@ -8177,6 +11032,8 @@ static void reghandlers(const void *closure, upb_handlers *h) {
                                 &file_startenum, NULL);
     upb_handlers_setstartsubmsg(h, F(FileDescriptorProto, extension),
                                 &file_startext, NULL);
+    upb_handlers_setstring(h, F(FileDescriptorProto, dependency),
+                           &file_ondep, NULL);
   } else if (upbdefs_google_protobuf_EnumValueDescriptorProto_is(m)) {
     upb_handlers_setstartmsg(h, &enumval_startmsg, NULL);
     upb_handlers_setendmsg(h, &enumval_endmsg, NULL);
@@ -8212,6 +11069,13 @@ static void reghandlers(const void *closure, upb_handlers *h) {
     upb_handlers_setbool(h, F(FieldOptions, packed), &field_onpacked, NULL);
   } else if (upbdefs_google_protobuf_MessageOptions_is(m)) {
     upb_handlers_setbool(h, F(MessageOptions, map_entry), &msg_onmapentry, NULL);
+  } else if (upbdefs_google_protobuf_FileOptions_is(m)) {
+    upb_handlers_setstring(h, F(FileOptions, php_class_prefix),
+                           &file_onphpprefix, NULL);
+    upb_handlers_setstartstr(h, F(FileOptions, php_namespace),
+                             &file_startphpnamespace, NULL);
+    upb_handlers_setstring(h, F(FileOptions, php_namespace),
+                           &file_onphpnamespace, NULL);
   }
 
   UPB_ASSERT(upb_ok(upb_handlers_status(h)));
@@ -8229,6 +11093,7 @@ void descreader_cleanup(void *_r) {
 
   upb_gfree(r->name);
   upb_inttable_uninit(&r->files);
+  upb_strtable_uninit(&r->files_by_name);
   upb_inttable_uninit(&r->oneofs);
   upb_gfree(r->default_string);
   while (r->stack_len > 0) {
@@ -8247,6 +11112,7 @@ upb_descreader *upb_descreader_create(upb_env *e, const upb_handlers *h) {
   }
 
   upb_inttable_init(&r->files, UPB_CTYPE_PTR);
+  upb_strtable_init(&r->files_by_name, UPB_CTYPE_PTR);
   upb_inttable_init(&r->oneofs, UPB_CTYPE_PTR);
   upb_sink_reset(upb_descreader_input(r), h, r);
   r->stack_len = 0;
@@ -8546,7 +11412,7 @@ static void put32(compiler *c, uint32_t v) {
   *c->pc++ = v;
 }
 
-static void putop(compiler *c, opcode op, ...) {
+static void putop(compiler *c, int op, ...) {
   va_list ap;
   va_start(ap, op);
 
@@ -9829,7 +12695,6 @@ have_tag:
       return upb_pbdecoder_suspend(d);
     }
 
-    /* TODO: deliver to unknown field callback. */
     switch (wire_type) {
       case UPB_WIRE_TYPE_32BIT:
         CHECK_RETURN(skip(d, 4));
@@ -9867,6 +12732,8 @@ have_tag:
     }
 
     if (d->top->groupnum >= 0) {
+      /* TODO: More code needed for handling unknown groups. */
+      upb_sink_putunknown(&d->top->sink, d->checkpoint, d->ptr - d->checkpoint);
       return DECODE_OK;
     }
 
@@ -10722,6 +13589,12 @@ static void *encode_startdelimfield(void *c, const void *hd) {
   return ok ? c : UPB_BREAK;
 }
 
+static bool encode_unknown(void *c, const void *hd, const char *buf,
+                           size_t len) {
+  UPB_UNUSED(hd);
+  return encode_bytes(c, buf, len) && commit(c);
+}
+
 static bool encode_enddelimfield(void *c, const void *hd) {
   UPB_UNUSED(hd);
   return end_delim(c);
@@ -10759,7 +13632,7 @@ static size_t encode_strbuf(void *c, const void *hd, const char *buf,
 T(double,   double,   dbl2uint64,   encode_fixed64)
 T(float,    float,    flt2uint32,   encode_fixed32)
 T(int64,    int64_t,  uint64_t,     encode_varint)
-T(int32,    int32_t,  uint32_t,     encode_varint)
+T(int32,    int32_t,  int64_t,      encode_varint)
 T(fixed64,  uint64_t, uint64_t,     encode_fixed64)
 T(fixed32,  uint32_t, uint32_t,     encode_fixed32)
 T(bool,     bool,     bool,         encode_varint)
@@ -10784,6 +13657,7 @@ static void newhandlers_callback(const void *closure, upb_handlers *h) {
 
   upb_handlers_setstartmsg(h, startmsg, NULL);
   upb_handlers_setendmsg(h, endmsg, NULL);
+  upb_handlers_setunknown(h, encode_unknown, NULL);
 
   m = upb_handlers_msgdef(h);
   for(upb_msg_field_begin(&i, m);
@@ -11374,57 +14248,6 @@ done:
   return r;
 }
 
-/* Given an encoded varint v, returns an integer with a single bit set that
- * indicates the end of the varint.  Subtracting one from this value will
- * yield a mask that leaves only bits that are part of the varint.  Returns
- * 0 if the varint is unterminated. */
-static uint64_t upb_get_vstopbit(uint64_t v) {
-  uint64_t cbits = v | 0x7f7f7f7f7f7f7f7fULL;
-  return ~cbits & (cbits+1);
-}
-
-/* A branchless decoder.  Credit to Pascal Massimino for the bit-twiddling. */
-upb_decoderet upb_vdecode_max8_massimino(upb_decoderet r) {
-  uint64_t b;
-  uint64_t stop_bit;
-  upb_decoderet my_r;
-  memcpy(&b, r.p, sizeof(b));
-  stop_bit = upb_get_vstopbit(b);
-  b =  (b & 0x7f7f7f7f7f7f7f7fULL) & (stop_bit - 1);
-  b +=       b & 0x007f007f007f007fULL;
-  b +=  3 * (b & 0x0000ffff0000ffffULL);
-  b += 15 * (b & 0x00000000ffffffffULL);
-  if (stop_bit == 0) {
-    /* Error: unterminated varint. */
-    upb_decoderet err_r = {(void*)0, 0};
-    return err_r;
-  }
-  my_r = upb_decoderet_make(r.p + ((__builtin_ctzll(stop_bit) + 1) / 8),
-                            r.val | (b << 7));
-  return my_r;
-}
-
-/* A branchless decoder.  Credit to Daniel Wright for the bit-twiddling. */
-upb_decoderet upb_vdecode_max8_wright(upb_decoderet r) {
-  uint64_t b;
-  uint64_t stop_bit;
-  upb_decoderet my_r;
-  memcpy(&b, r.p, sizeof(b));
-  stop_bit = upb_get_vstopbit(b);
-  b &= (stop_bit - 1);
-  b = ((b & 0x7f007f007f007f00ULL) >> 1) | (b & 0x007f007f007f007fULL);
-  b = ((b & 0xffff0000ffff0000ULL) >> 2) | (b & 0x0000ffff0000ffffULL);
-  b = ((b & 0xffffffff00000000ULL) >> 4) | (b & 0x00000000ffffffffULL);
-  if (stop_bit == 0) {
-    /* Error: unterminated varint. */
-    upb_decoderet err_r = {(void*)0, 0};
-    return err_r;
-  }
-  my_r = upb_decoderet_make(r.p + ((__builtin_ctzll(stop_bit) + 1) / 8),
-                            r.val | (b << 14));
-  return my_r;
-}
-
 #line 1 "upb/json/parser.rl"
 /*
 ** upb::json::Parser (upb_json_parser)
@@ -11447,8 +14270,9 @@ upb_decoderet upb_vdecode_max8_wright(upb_decoderet r) {
 ** - handling of keys/escape-sequences/etc that span input buffers.
 */
 
-#include <assert.h>
 #include <errno.h>
+#include <float.h>
+#include <math.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12033,103 +14857,160 @@ static void start_number(upb_json_parser *p, const char *ptr) {
   capture_begin(p, ptr);
 }
 
-static bool parse_number(upb_json_parser *p);
+static bool parse_number(upb_json_parser *p, bool is_quoted);
 
 static bool end_number(upb_json_parser *p, const char *ptr) {
   if (!capture_end(p, ptr)) {
     return false;
   }
 
-  return parse_number(p);
+  return parse_number(p, false);
 }
 
-static bool parse_number(upb_json_parser *p) {
-  size_t len;
-  const char *buf;
-  const char *myend;
+/* |buf| is NULL-terminated. |buf| itself will never include quotes;
+ * |is_quoted| tells us whether this text originally appeared inside quotes. */
+static bool parse_number_from_buffer(upb_json_parser *p, const char *buf,
+                                     bool is_quoted) {
+  size_t len = strlen(buf);
+  const char *bufend = buf + len;
   char *end;
+  upb_fieldtype_t type = upb_fielddef_type(p->top->f);
+  double val;
+  double dummy;
+  double inf = 1.0 / 0.0;  /* C89 does not have an INFINITY macro. */
 
-  /* strtol() and friends unfortunately do not support specifying the length of
-   * the input string, so we need to force a copy into a NULL-terminated buffer. */
-  if (!multipart_text(p, "\0", 1, false)) {
+  errno = 0;
+
+  if (len == 0 || buf[0] == ' ') {
     return false;
   }
 
-  buf = accumulate_getptr(p, &len);
-  myend = buf + len - 1;  /* One for NULL. */
-
-  /* XXX: We are using strtol to parse integers, but this is wrong as even
-   * integers can be represented as 1e6 (for example), which strtol can't
-   * handle correctly.
-   *
-   * XXX: Also, we can't handle large integers properly because strto[u]ll
-   * isn't in C89.
-   *
-   * XXX: Also, we don't properly check floats for overflow, since strtof
-   * isn't in C89. */
-  switch (upb_fielddef_type(p->top->f)) {
+  /* For integer types, first try parsing with integer-specific routines.
+   * If these succeed, they will be more accurate for int64/uint64 than
+   * strtod().
+   */
+  switch (type) {
     case UPB_TYPE_ENUM:
     case UPB_TYPE_INT32: {
-      long val = strtol(p->accumulated, &end, 0);
-      if (val > INT32_MAX || val < INT32_MIN || errno == ERANGE || end != myend)
-        goto err;
-      else
+      long val = strtol(buf, &end, 0);
+      if (errno == ERANGE || end != bufend) {
+        break;
+      } else if (val > INT32_MAX || val < INT32_MIN) {
+        return false;
+      } else {
         upb_sink_putint32(&p->top->sink, parser_getsel(p), val);
-      break;
-    }
-    case UPB_TYPE_INT64: {
-      long long val = strtol(p->accumulated, &end, 0);
-      if (val > INT64_MAX || val < INT64_MIN || errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putint64(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
     }
     case UPB_TYPE_UINT32: {
-      unsigned long val = strtoul(p->accumulated, &end, 0);
-      if (val > UINT32_MAX || errno == ERANGE || end != myend)
-        goto err;
-      else
+      unsigned long val = strtoul(buf, &end, 0);
+      if (end != bufend) {
+        break;
+      } else if (val > UINT32_MAX || errno == ERANGE) {
+        return false;
+      } else {
         upb_sink_putuint32(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
+    }
+    /* XXX: We can't handle [u]int64 properly on 32-bit machines because
+     * strto[u]ll isn't in C89. */
+    case UPB_TYPE_INT64: {
+      long val = strtol(buf, &end, 0);
+      if (errno == ERANGE || end != bufend) {
+        break;
+      } else {
+        upb_sink_putint64(&p->top->sink, parser_getsel(p), val);
+        return true;
+      }
     }
     case UPB_TYPE_UINT64: {
-      unsigned long long val = strtoul(p->accumulated, &end, 0);
-      if (val > UINT64_MAX || errno == ERANGE || end != myend)
-        goto err;
-      else
+      unsigned long val = strtoul(p->accumulated, &end, 0);
+      if (end != bufend) {
+        break;
+      } else if (errno == ERANGE) {
+        return false;
+      } else {
         upb_sink_putuint64(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
     }
-    case UPB_TYPE_DOUBLE: {
-      double val = strtod(p->accumulated, &end);
-      if (errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putdouble(&p->top->sink, parser_getsel(p), val);
+    default:
       break;
+  }
+
+  if (type != UPB_TYPE_DOUBLE && type != UPB_TYPE_FLOAT && is_quoted) {
+    /* Quoted numbers for integer types are not allowed to be in double form. */
+    return false;
+  }
+
+  if (len == strlen("Infinity") && strcmp(buf, "Infinity") == 0) {
+    /* C89 does not have an INFINITY macro. */
+    val = inf;
+  } else if (len == strlen("-Infinity") && strcmp(buf, "-Infinity") == 0) {
+    val = -inf;
+  } else {
+    val = strtod(buf, &end);
+    if (errno == ERANGE || end != bufend) {
+      return false;
     }
-    case UPB_TYPE_FLOAT: {
-      float val = strtod(p->accumulated, &end);
-      if (errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putfloat(&p->top->sink, parser_getsel(p), val);
-      break;
+  }
+
+  switch (type) {
+#define CASE(capitaltype, smalltype, ctype, min, max)                     \
+    case UPB_TYPE_ ## capitaltype: {                                      \
+      if (modf(val, &dummy) != 0 || val > max || val < min) {             \
+        return false;                                                     \
+      } else {                                                            \
+        upb_sink_put ## smalltype(&p->top->sink, parser_getsel(p),        \
+                                  (ctype)val);                            \
+        return true;                                                      \
+      }                                                                   \
+      break;                                                              \
     }
+    case UPB_TYPE_ENUM:
+    CASE(INT32, int32, int32_t, INT32_MIN, INT32_MAX);
+    CASE(INT64, int64, int64_t, INT64_MIN, INT64_MAX);
+    CASE(UINT32, uint32, uint32_t, 0, UINT32_MAX);
+    CASE(UINT64, uint64, uint64_t, 0, UINT64_MAX);
+#undef CASE
+
+    case UPB_TYPE_DOUBLE:
+      upb_sink_putdouble(&p->top->sink, parser_getsel(p), val);
+      return true;
+    case UPB_TYPE_FLOAT:
+      if ((val > FLT_MAX || val < -FLT_MAX) && val != inf && val != -inf) {
+        return false;
+      } else {
+        upb_sink_putfloat(&p->top->sink, parser_getsel(p), val);
+        return true;
+      }
     default:
-      UPB_ASSERT(false);
+      return false;
   }
+}
 
-  multipart_end(p);
+static bool parse_number(upb_json_parser *p, bool is_quoted) {
+  size_t len;
+  const char *buf;
 
-  return true;
+  /* strtol() and friends unfortunately do not support specifying the length of
+   * the input string, so we need to force a copy into a NULL-terminated buffer. */
+  if (!multipart_text(p, "\0", 1, false)) {
+    return false;
+  }
 
-err:
-  upb_status_seterrf(&p->status, "error parsing number: %s", buf);
-  upb_env_reporterror(p->env, &p->status);
-  multipart_end(p);
-  return false;
+  buf = accumulate_getptr(p, &len);
+
+  if (parse_number_from_buffer(p, buf, is_quoted)) {
+    multipart_end(p);
+    return true;
+  } else {
+    upb_status_seterrf(&p->status, "error parsing number: %s", buf);
+    upb_env_reporterror(p->env, &p->status);
+    multipart_end(p);
+    return false;
+  }
 }
 
 static bool parser_putbool(upb_json_parser *p, bool val) {
@@ -12182,17 +15063,16 @@ static bool start_stringval(upb_json_parser *p) {
       multipart_startaccum(p);
       return true;
     }
-  } else if (upb_fielddef_type(p->top->f) == UPB_TYPE_ENUM) {
-    /* No need to push a frame -- symbolic enum names in quotes remain in the
-     * current parser frame.
-     *
-     * Enum string values must accumulate so we can look up the value in a table
-     * once it is complete. */
+  } else if (upb_fielddef_type(p->top->f) != UPB_TYPE_BOOL &&
+             upb_fielddef_type(p->top->f) != UPB_TYPE_MESSAGE) {
+    /* No need to push a frame -- numeric values in quotes remain in the
+     * current parser frame.  These values must accmulate so we can convert
+     * them all at once at the end. */
     multipart_startaccum(p);
     return true;
   } else {
     upb_status_seterrf(&p->status,
-                       "String specified for non-string/non-enum field: %s",
+                       "String specified for bool or submessage field: %s",
                        upb_fielddef_name(p->top->f));
     upb_env_reporterror(p->env, &p->status);
     return false;
@@ -12239,6 +15119,15 @@ static bool end_stringval(upb_json_parser *p) {
       break;
     }
 
+    case UPB_TYPE_INT32:
+    case UPB_TYPE_INT64:
+    case UPB_TYPE_UINT32:
+    case UPB_TYPE_UINT64:
+    case UPB_TYPE_DOUBLE:
+    case UPB_TYPE_FLOAT:
+      ok = parse_number(p, true);
+      break;
+
     default:
       UPB_ASSERT(false);
       upb_status_seterrmsg(&p->status, "Internal error in JSON decoder");
@@ -12282,7 +15171,7 @@ static bool parse_mapentry_key(upb_json_parser *p) {
     case UPB_TYPE_UINT32:
     case UPB_TYPE_UINT64:
       /* Invoke end_number. The accum buffer has the number's text already. */
-      if (!parse_number(p)) {
+      if (!parse_number(p, true)) {
         return false;
       }
       break;
@@ -12573,11 +15462,11 @@ static void end_object(upb_json_parser *p) {
  * final state once, when the closing '"' is seen. */
 
 
-#line 1244 "upb/json/parser.rl"
+#line 1310 "upb/json/parser.rl"
 
 
 
-#line 1156 "upb/json/parser.c"
+#line 1222 "upb/json/parser.c"
 static const char _json_actions[] = {
 	0, 1, 0, 1, 2, 1, 3, 1, 
 	5, 1, 6, 1, 7, 1, 8, 1, 
@@ -12726,7 +15615,7 @@ static const int json_en_value_machine = 27;
 static const int json_en_main = 1;
 
 
-#line 1247 "upb/json/parser.rl"
+#line 1313 "upb/json/parser.rl"
 
 size_t parse(void *closure, const void *hd, const char *buf, size_t size,
              const upb_bufhandle *handle) {
@@ -12748,7 +15637,7 @@ size_t parse(void *closure, const void *hd, const char *buf, size_t size,
   capture_resume(parser, buf);
 
   
-#line 1327 "upb/json/parser.c"
+#line 1393 "upb/json/parser.c"
 	{
 	int _klen;
 	unsigned int _trans;
@@ -12823,118 +15712,118 @@ _match:
 		switch ( *_acts++ )
 		{
 	case 0:
-#line 1159 "upb/json/parser.rl"
+#line 1225 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 1:
-#line 1160 "upb/json/parser.rl"
+#line 1226 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 10; goto _again;} }
 	break;
 	case 2:
-#line 1164 "upb/json/parser.rl"
+#line 1230 "upb/json/parser.rl"
 	{ start_text(parser, p); }
 	break;
 	case 3:
-#line 1165 "upb/json/parser.rl"
+#line 1231 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_text(parser, p)); }
 	break;
 	case 4:
-#line 1171 "upb/json/parser.rl"
+#line 1237 "upb/json/parser.rl"
 	{ start_hex(parser); }
 	break;
 	case 5:
-#line 1172 "upb/json/parser.rl"
+#line 1238 "upb/json/parser.rl"
 	{ hexdigit(parser, p); }
 	break;
 	case 6:
-#line 1173 "upb/json/parser.rl"
+#line 1239 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_hex(parser)); }
 	break;
 	case 7:
-#line 1179 "upb/json/parser.rl"
+#line 1245 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(escape(parser, p)); }
 	break;
 	case 8:
-#line 1185 "upb/json/parser.rl"
+#line 1251 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 9:
-#line 1188 "upb/json/parser.rl"
+#line 1254 "upb/json/parser.rl"
 	{ {stack[top++] = cs; cs = 19; goto _again;} }
 	break;
 	case 10:
-#line 1190 "upb/json/parser.rl"
+#line 1256 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 27; goto _again;} }
 	break;
 	case 11:
-#line 1195 "upb/json/parser.rl"
+#line 1261 "upb/json/parser.rl"
 	{ start_member(parser); }
 	break;
 	case 12:
-#line 1196 "upb/json/parser.rl"
+#line 1262 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_membername(parser)); }
 	break;
 	case 13:
-#line 1199 "upb/json/parser.rl"
+#line 1265 "upb/json/parser.rl"
 	{ end_member(parser); }
 	break;
 	case 14:
-#line 1205 "upb/json/parser.rl"
+#line 1271 "upb/json/parser.rl"
 	{ start_object(parser); }
 	break;
 	case 15:
-#line 1208 "upb/json/parser.rl"
+#line 1274 "upb/json/parser.rl"
 	{ end_object(parser); }
 	break;
 	case 16:
-#line 1214 "upb/json/parser.rl"
+#line 1280 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_array(parser)); }
 	break;
 	case 17:
-#line 1218 "upb/json/parser.rl"
+#line 1284 "upb/json/parser.rl"
 	{ end_array(parser); }
 	break;
 	case 18:
-#line 1223 "upb/json/parser.rl"
+#line 1289 "upb/json/parser.rl"
 	{ start_number(parser, p); }
 	break;
 	case 19:
-#line 1224 "upb/json/parser.rl"
+#line 1290 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_number(parser, p)); }
 	break;
 	case 20:
-#line 1226 "upb/json/parser.rl"
+#line 1292 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_stringval(parser)); }
 	break;
 	case 21:
-#line 1227 "upb/json/parser.rl"
+#line 1293 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_stringval(parser)); }
 	break;
 	case 22:
-#line 1229 "upb/json/parser.rl"
+#line 1295 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(parser_putbool(parser, true)); }
 	break;
 	case 23:
-#line 1231 "upb/json/parser.rl"
+#line 1297 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(parser_putbool(parser, false)); }
 	break;
 	case 24:
-#line 1233 "upb/json/parser.rl"
+#line 1299 "upb/json/parser.rl"
 	{ /* null value */ }
 	break;
 	case 25:
-#line 1235 "upb/json/parser.rl"
+#line 1301 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_subobject(parser)); }
 	break;
 	case 26:
-#line 1236 "upb/json/parser.rl"
+#line 1302 "upb/json/parser.rl"
 	{ end_subobject(parser); }
 	break;
 	case 27:
-#line 1241 "upb/json/parser.rl"
+#line 1307 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
-#line 1513 "upb/json/parser.c"
+#line 1579 "upb/json/parser.c"
 		}
 	}
 
@@ -12947,7 +15836,7 @@ _again:
 	_out: {}
 	}
 
-#line 1268 "upb/json/parser.rl"
+#line 1334 "upb/json/parser.rl"
 
   if (p != pe) {
     upb_status_seterrf(&parser->status, "Parse error at '%.*s'\n", pe - p, p);
@@ -12988,13 +15877,13 @@ static void json_parser_reset(upb_json_parser *p) {
 
   /* Emit Ragel initialization of the parser. */
   
-#line 1567 "upb/json/parser.c"
+#line 1633 "upb/json/parser.c"
 	{
 	cs = json_start;
 	top = 0;
 	}
 
-#line 1308 "upb/json/parser.rl"
+#line 1374 "upb/json/parser.rl"
   p->current_state = cs;
   p->parser_top = top;
   accumulate_clear(p);
@@ -13291,10 +16180,23 @@ static void putstring(upb_json_printer *p, const char *buf, unsigned int len) {
  * Right now we use %.8g and %.17g for float/double, respectively, to match
  * proto2::util::JsonFormat's defaults.  May want to change this later. */
 
+const char neginf[] = "\"-Infinity\"";
+const char inf[] = "\"Infinity\"";
+
 static size_t fmt_double(double val, char* buf, size_t length) {
-  size_t n = _upb_snprintf(buf, length, "%.17g", val);
-  CHKLENGTH(n > 0 && n < length);
-  return n;
+  if (val == (1.0 / 0.0)) {
+    CHKLENGTH(length >= strlen(inf));
+    strcpy(buf, inf);
+    return strlen(inf);
+  } else if (val == (-1.0 / 0.0)) {
+    CHKLENGTH(length >= strlen(neginf));
+    strcpy(buf, neginf);
+    return strlen(neginf);
+  } else {
+    size_t n = _upb_snprintf(buf, length, "%.17g", val);
+    CHKLENGTH(n > 0 && n < length);
+    return n;
+  }
 }
 
 static size_t fmt_float(float val, char* buf, size_t length) {
diff --git a/php/ext/google/protobuf/upb.h b/php/ext/google/protobuf/upb.h
index 5f780458..a263db30 100644
--- a/php/ext/google/protobuf/upb.h
+++ b/php/ext/google/protobuf/upb.h
@@ -1,4 +1,46 @@
 // Amalgamated source file
+
+// php.h intentionally defined NDEBUG. We have to define this macro in order to
+// be used together with php.h
+#ifndef NDEBUG
+#define NDEBUG
+#endif
+
+/*
+** upb_decode: parsing into a upb_msg using a upb_msglayout.
+*/
+
+#ifndef UPB_DECODE_H_
+#define UPB_DECODE_H_
+
+/*
+** upb::Message is a representation for protobuf messages.
+**
+** However it differs from other common representations like
+** google::protobuf::Message in one key way: it does not prescribe any
+** ownership between messages and submessages, and it relies on the
+** client to delete each message/submessage/array/map at the appropriate
+** time.
+**
+** A client can access a upb::Message without knowing anything about
+** ownership semantics, but to create or mutate a message a user needs
+** to implement the memory management themselves.
+**
+** Currently all messages, arrays, and maps store a upb_alloc* internally.
+** Mutating operations use this when they require dynamically-allocated
+** memory.  We could potentially eliminate this size overhead later by
+** letting the user flip a bit on the factory that prevents this from
+** being stored.  The user would then need to use separate functions where
+** the upb_alloc* is passed explicitly.  However for handlers to populate
+** such structures, they would need a place to store this upb_alloc* during
+** parsing; upb_handlers don't currently have a good way to accommodate this.
+**
+** TODO: UTF-8 checking?
+**/
+
+#ifndef UPB_MSG_H_
+#define UPB_MSG_H_
+
 /*
 ** Defs are upb's internal representation of the constructs that can appear
 ** in a .proto file:
@@ -62,12 +104,6 @@
 #ifndef UPB_TABLE_H_
 #define UPB_TABLE_H_
 
-// php.h intentionally defined NDEBUG. We have to define this macro in order to
-// be used together with php.h
-#ifndef NDEBUG
-#define NDEBUG
-#endif
-
 #include <stdint.h>
 #include <string.h>
 /*
@@ -106,6 +142,9 @@ template <int N> class InlinedEnvironment;
 #define UPB_INLINE static
 #endif
 
+/* Hints to the compiler about likely/unlikely branches. */
+#define UPB_LIKELY(x) __builtin_expect((x),1)
+
 /* Define UPB_BIG_ENDIAN manually if you're on big endian and your compiler
  * doesn't provide these preprocessor symbols. */
 #if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
@@ -367,6 +406,16 @@ class PointerBase2 : public PointerBase<T, Base> {
 
 #endif
 
+/* A list of types as they are encoded on-the-wire. */
+typedef enum {
+  UPB_WIRE_TYPE_VARINT      = 0,
+  UPB_WIRE_TYPE_64BIT       = 1,
+  UPB_WIRE_TYPE_DELIMITED   = 2,
+  UPB_WIRE_TYPE_START_GROUP = 3,
+  UPB_WIRE_TYPE_END_GROUP   = 4,
+  UPB_WIRE_TYPE_32BIT       = 5
+} upb_wiretype_t;
+
 
 /* upb::ErrorSpace ************************************************************/
 
@@ -695,7 +744,7 @@ void upb_env_uninit(upb_env *e);
 
 void upb_env_initonly(upb_env *e);
 
-upb_arena *upb_env_arena(upb_env *e);
+UPB_INLINE upb_arena *upb_env_arena(upb_env *e) { return (upb_arena*)e; }
 bool upb_env_ok(const upb_env *e);
 void upb_env_seterrorfunc(upb_env *e, upb_error_func *func, void *ud);
 
@@ -1953,6 +2002,9 @@ typedef enum {
   UPB_SYNTAX_PROTO3 = 3
 } upb_syntax_t;
 
+/* Maps descriptor type -> upb field type.  */
+extern const uint8_t upb_desctype_to_fieldtype[];
+
 /* Maximum field number allowed for FieldDefs.  This is an inherent limit of the
  * protobuf wire format. */
 #define UPB_MAX_FIELDNUMBER ((1 << 29) - 1)
@@ -2972,6 +3024,17 @@ class upb::FileDef {
   const char* package() const;
   bool set_package(const char* package, Status* s);
 
+  /* Sets the php class prefix which is prepended to all php generated classes
+   * from this .proto. Default is empty. */
+  const char* phpprefix() const;
+  bool set_phpprefix(const char* phpprefix, Status* s);
+
+  /* Use this option to change the namespace of php generated classes. Default
+   * is empty. When this option is empty, the package name will be used for
+   * determining the namespace. */
+  const char* phpnamespace() const;
+  bool set_phpnamespace(const char* phpnamespace, Status* s);
+
   /* Syntax for the file.  Defaults to proto2. */
   upb_syntax_t syntax() const;
   void set_syntax(upb_syntax_t syntax);
@@ -3025,6 +3088,8 @@ UPB_REFCOUNTED_CMETHODS(upb_filedef, upb_filedef_upcast)
 
 const char *upb_filedef_name(const upb_filedef *f);
 const char *upb_filedef_package(const upb_filedef *f);
+const char *upb_filedef_phpprefix(const upb_filedef *f);
+const char *upb_filedef_phpnamespace(const upb_filedef *f);
 upb_syntax_t upb_filedef_syntax(const upb_filedef *f);
 size_t upb_filedef_defcount(const upb_filedef *f);
 size_t upb_filedef_depcount(const upb_filedef *f);
@@ -3034,6 +3099,10 @@ const upb_filedef *upb_filedef_dep(const upb_filedef *f, size_t i);
 bool upb_filedef_freeze(upb_filedef *f, upb_status *s);
 bool upb_filedef_setname(upb_filedef *f, const char *name, upb_status *s);
 bool upb_filedef_setpackage(upb_filedef *f, const char *package, upb_status *s);
+bool upb_filedef_setphpprefix(upb_filedef *f, const char *phpprefix,
+                              upb_status *s);
+bool upb_filedef_setphpnamespace(upb_filedef *f, const char *phpnamespace,
+                                 upb_status *s);
 bool upb_filedef_setsyntax(upb_filedef *f, upb_syntax_t syntax, upb_status *s);
 
 bool upb_filedef_adddef(upb_filedef *f, upb_def *def, const void *ref_donor,
@@ -3792,6 +3861,18 @@ inline const char* FileDef::package() const {
 inline bool FileDef::set_package(const char* package, Status* s) {
   return upb_filedef_setpackage(this, package, s);
 }
+inline const char* FileDef::phpprefix() const {
+  return upb_filedef_phpprefix(this);
+}
+inline bool FileDef::set_phpprefix(const char* phpprefix, Status* s) {
+  return upb_filedef_setphpprefix(this, phpprefix, s);
+}
+inline const char* FileDef::phpnamespace() const {
+  return upb_filedef_phpnamespace(this);
+}
+inline bool FileDef::set_phpnamespace(const char* phpnamespace, Status* s) {
+  return upb_filedef_setphpnamespace(this, phpnamespace, s);
+}
 inline int FileDef::def_count() const {
   return upb_filedef_defcount(this);
 }
@@ -3828,194 +3909,6 @@ inline bool FileDef::AddDependency(const FileDef* file) {
 
 #endif /* UPB_DEF_H_ */
 /*
-** This file contains definitions of structs that should be considered private
-** and NOT stable across versions of upb.
-**
-** The only reason they are declared here and not in .c files is to allow upb
-** and the application (if desired) to embed statically-initialized instances
-** of structures like defs.
-**
-** If you include this file, all guarantees of ABI compatibility go out the
-** window!  Any code that includes this file needs to recompile against the
-** exact same version of upb that they are linking against.
-**
-** You also need to recompile if you change the value of the UPB_DEBUG_REFS
-** flag.
-*/
-
-
-#ifndef UPB_STATICINIT_H_
-#define UPB_STATICINIT_H_
-
-#ifdef __cplusplus
-/* Because of how we do our typedefs, this header can't be included from C++. */
-#error This file cannot be included from C++
-#endif
-
-/* upb_refcounted *************************************************************/
-
-
-/* upb_def ********************************************************************/
-
-struct upb_def {
-  upb_refcounted base;
-
-  const char *fullname;
-  const upb_filedef* file;
-  char type;  /* A upb_deftype_t (char to save space) */
-
-  /* Used as a flag during the def's mutable stage.  Must be false unless
-   * it is currently being used by a function on the stack.  This allows
-   * us to easily determine which defs were passed into the function's
-   * current invocation. */
-  bool came_from_user;
-};
-
-#define UPB_DEF_INIT(name, type, vtbl, refs, ref2s) \
-    { UPB_REFCOUNT_INIT(vtbl, refs, ref2s), name, NULL, type, false }
-
-
-/* upb_fielddef ***************************************************************/
-
-struct upb_fielddef {
-  upb_def base;
-
-  union {
-    int64_t sint;
-    uint64_t uint;
-    double dbl;
-    float flt;
-    void *bytes;
-  } defaultval;
-  union {
-    const upb_msgdef *def;  /* If !msg_is_symbolic. */
-    char *name;             /* If msg_is_symbolic. */
-  } msg;
-  union {
-    const upb_def *def;  /* If !subdef_is_symbolic. */
-    char *name;          /* If subdef_is_symbolic. */
-  } sub;  /* The msgdef or enumdef for this field, if upb_hassubdef(f). */
-  bool subdef_is_symbolic;
-  bool msg_is_symbolic;
-  const upb_oneofdef *oneof;
-  bool default_is_string;
-  bool type_is_set_;     /* False until type is explicitly set. */
-  bool is_extension_;
-  bool lazy_;
-  bool packed_;
-  upb_intfmt_t intfmt;
-  bool tagdelim;
-  upb_fieldtype_t type_;
-  upb_label_t label_;
-  uint32_t number_;
-  uint32_t selector_base;  /* Used to index into a upb::Handlers table. */
-  uint32_t index_;
-};
-
-extern const struct upb_refcounted_vtbl upb_fielddef_vtbl;
-
-#define UPB_FIELDDEF_INIT(label, type, intfmt, tagdelim, is_extension, lazy,   \
-                          packed, name, num, msgdef, subdef, selector_base,    \
-                          index, defaultval, refs, ref2s)                      \
-  {                                                                            \
-    UPB_DEF_INIT(name, UPB_DEF_FIELD, &upb_fielddef_vtbl, refs, ref2s),        \
-        defaultval, {msgdef}, {subdef}, NULL, false, false,                    \
-        type == UPB_TYPE_STRING || type == UPB_TYPE_BYTES, true, is_extension, \
-        lazy, packed, intfmt, tagdelim, type, label, num, selector_base, index \
-  }
-
-
-/* upb_msgdef *****************************************************************/
-
-struct upb_msgdef {
-  upb_def base;
-
-  size_t selector_count;
-  uint32_t submsg_field_count;
-
-  /* Tables for looking up fields by number and name. */
-  upb_inttable itof;  /* int to field */
-  upb_strtable ntof;  /* name to field/oneof */
-
-  /* Is this a map-entry message? */
-  bool map_entry;
-
-  /* Whether this message has proto2 or proto3 semantics. */
-  upb_syntax_t syntax;
-
-  /* TODO(haberman): proper extension ranges (there can be multiple). */
-};
-
-extern const struct upb_refcounted_vtbl upb_msgdef_vtbl;
-
-/* TODO: also support static initialization of the oneofs table. This will be
- * needed if we compile in descriptors that contain oneofs. */
-#define UPB_MSGDEF_INIT(name, selector_count, submsg_field_count, itof, ntof, \
-                        map_entry, syntax, refs, ref2s)                       \
-  {                                                                           \
-    UPB_DEF_INIT(name, UPB_DEF_MSG, &upb_fielddef_vtbl, refs, ref2s),         \
-        selector_count, submsg_field_count, itof, ntof, map_entry, syntax     \
-  }
-
-
-/* upb_enumdef ****************************************************************/
-
-struct upb_enumdef {
-  upb_def base;
-
-  upb_strtable ntoi;
-  upb_inttable iton;
-  int32_t defaultval;
-};
-
-extern const struct upb_refcounted_vtbl upb_enumdef_vtbl;
-
-#define UPB_ENUMDEF_INIT(name, ntoi, iton, defaultval, refs, ref2s) \
-  { UPB_DEF_INIT(name, UPB_DEF_ENUM, &upb_enumdef_vtbl, refs, ref2s), ntoi,    \
-    iton, defaultval }
-
-
-/* upb_oneofdef ***************************************************************/
-
-struct upb_oneofdef {
-  upb_refcounted base;
-
-  uint32_t index;  /* Index within oneofs. */
-  const char *name;
-  upb_strtable ntof;
-  upb_inttable itof;
-  const upb_msgdef *parent;
-};
-
-extern const struct upb_refcounted_vtbl upb_oneofdef_vtbl;
-
-#define UPB_ONEOFDEF_INIT(name, ntof, itof, refs, ref2s) \
-  { UPB_REFCOUNT_INIT(&upb_oneofdef_vtbl, refs, ref2s), 0, name, ntof, itof }
-
-
-/* upb_symtab *****************************************************************/
-
-struct upb_symtab {
-  upb_refcounted base;
-
-  upb_strtable symtab;
-};
-
-struct upb_filedef {
-  upb_refcounted base;
-
-  const char *name;
-  const char *package;
-  upb_syntax_t syntax;
-
-  upb_inttable defs;
-  upb_inttable deps;
-};
-
-extern const struct upb_refcounted_vtbl upb_filedef_vtbl;
-
-#endif  /* UPB_STATICINIT_H_ */
-/*
 ** upb::Handlers (upb_handlers)
 **
 ** A upb_handlers is like a virtual table for a upb_msgdef.  Each field of the
@@ -4119,7 +4012,8 @@ UPB_END_EXTERN_C
 /* Static selectors for upb::Handlers. */
 #define UPB_STARTMSG_SELECTOR 0
 #define UPB_ENDMSG_SELECTOR 1
-#define UPB_STATIC_SELECTOR_COUNT 2
+#define UPB_UNKNOWN_SELECTOR 2
+#define UPB_STATIC_SELECTOR_COUNT 3
 
 /* Static selectors for upb::BytesHandler. */
 #define UPB_STARTSTR_SELECTOR 0
@@ -4648,6 +4542,8 @@ UPB_BEGIN_EXTERN_C
 /* Native C API. */
 
 /* Handler function typedefs. */
+typedef bool upb_unknown_handlerfunc(void *c, const void *hd, const char *buf,
+                                     size_t n);
 typedef bool upb_startmsg_handlerfunc(void *c, const void*);
 typedef bool upb_endmsg_handlerfunc(void *c, const void *, upb_status *status);
 typedef void* upb_startfield_handlerfunc(void *c, const void *hd);
@@ -4701,6 +4597,8 @@ const upb_status *upb_handlers_status(upb_handlers *h);
 void upb_handlers_clearerr(upb_handlers *h);
 const upb_msgdef *upb_handlers_msgdef(const upb_handlers *h);
 bool upb_handlers_addcleanup(upb_handlers *h, void *p, upb_handlerfree *hfree);
+bool upb_handlers_setunknown(upb_handlers *h, upb_unknown_handlerfunc *func,
+                             upb_handlerattr *attr);
 
 bool upb_handlers_setstartmsg(upb_handlers *h, upb_startmsg_handlerfunc *func,
                               upb_handlerattr *attr);
@@ -6270,6 +6168,18 @@ UPB_INLINE size_t upb_sink_putstring(upb_sink *s, upb_selector_t sel,
   return handler(s->closure, hd, buf, n, handle);
 }
 
+UPB_INLINE bool upb_sink_putunknown(upb_sink *s, const char *buf, size_t n) {
+  typedef upb_unknown_handlerfunc func;
+  func *handler;
+  const void *hd;
+  if (!s->handlers) return true;
+  handler = (func *)upb_handlers_gethandler(s->handlers, UPB_UNKNOWN_SELECTOR);
+
+  if (!handler) return n;
+  hd = upb_handlers_gethandlerdata(s->handlers, UPB_UNKNOWN_SELECTOR);
+  return handler(s->closure, hd, buf, n);
+}
+
 UPB_INLINE bool upb_sink_startmsg(upb_sink *s) {
   typedef upb_startmsg_handlerfunc func;
   func *startmsg;
@@ -6474,34 +6384,6 @@ inline bool BufferSource::PutBuffer(const char *buf, size_t len,
 #endif
 
 #endif
-/*
-** upb::Message is a representation for protobuf messages.
-**
-** However it differs from other common representations like
-** google::protobuf::Message in one key way: it does not prescribe any
-** ownership between messages and submessages, and it relies on the
-** client to delete each message/submessage/array/map at the appropriate
-** time.
-**
-** A client can access a upb::Message without knowing anything about
-** ownership semantics, but to create or mutate a message a user needs
-** to implement the memory management themselves.
-**
-** Currently all messages, arrays, and maps store a upb_alloc* internally.
-** Mutating operations use this when they require dynamically-allocated
-** memory.  We could potentially eliminate this size overhead later by
-** letting the user flip a bit on the factory that prevents this from
-** being stored.  The user would then need to use separate functions where
-** the upb_alloc* is passed explicitly.  However for handlers to populate
-** such structures, they would need a place to store this upb_alloc* during
-** parsing; upb_handlers don't currently have a good way to accommodate this.
-**
-** TODO: UTF-8 checking?
-**/
-
-#ifndef UPB_MSG_H_
-#define UPB_MSG_H_
-
 
 #ifdef __cplusplus
 
@@ -6538,21 +6420,6 @@ typedef void upb_msg;
  * instances of this from a upb_msgfactory, and the factory always owns the
  * msglayout. */
 
-/* Gets the factory for this layout */
-upb_msgfactory *upb_msglayout_factory(const upb_msglayout *l);
-
-/* Get the msglayout for a submessage.  This requires that this field is a
- * submessage, ie. upb_fielddef_issubmsg(upb_msglayout_msgdef(l)) == true.
- *
- * Since map entry messages don't have layouts, if upb_fielddef_ismap(f) == true
- * then this function will return the layout for the map's value.  It requires
- * that the value type of the map field is a submessage. */
-const upb_msglayout *upb_msglayout_sublayout(const upb_msglayout *l,
-                                             const upb_fielddef *f);
-
-/* Returns the msgdef for this msglayout. */
-const upb_msgdef *upb_msglayout_msgdef(const upb_msglayout *l);
-
 
 /** upb_visitor ***************************************************************/
 
@@ -6598,6 +6465,23 @@ const upb_visitorplan *upb_msgfactory_getvisitorplan(upb_msgfactory *f,
                                                      const upb_handlers *h);
 
 
+/** upb_stringview ************************************************************/
+
+typedef struct {
+  const char *data;
+  size_t size;
+} upb_stringview;
+
+UPB_INLINE upb_stringview upb_stringview_make(const char *data, size_t size) {
+  upb_stringview ret;
+  ret.data = data;
+  ret.size = size;
+  return ret;
+}
+
+#define UPB_STRINGVIEW_INIT(ptr, len) {ptr, len}
+
+
 /** upb_msgval ****************************************************************/
 
 /* A union representing all possible protobuf values.  Used for generic get/set
@@ -6615,10 +6499,7 @@ typedef union {
   const upb_msg* msg;
   const upb_array* arr;
   const void* ptr;
-  struct {
-    const char *ptr;
-    size_t len;
-  } str;
+  upb_stringview str;
 } upb_msgval;
 
 #define ACCESSORS(name, membername, ctype) \
@@ -6645,22 +6526,12 @@ ACCESSORS(map,    map, const upb_map*)
 ACCESSORS(msg,    msg, const upb_msg*)
 ACCESSORS(ptr,    ptr, const void*)
 ACCESSORS(arr,    arr, const upb_array*)
+ACCESSORS(str,    str, upb_stringview)
 
 #undef ACCESSORS
 
-UPB_INLINE upb_msgval upb_msgval_str(const char *ptr, size_t len) {
-  upb_msgval ret;
-  ret.str.ptr = ptr;
-  ret.str.len = len;
-  return ret;
-}
-
-UPB_INLINE const char* upb_msgval_getstr(upb_msgval val) {
-  return val.str.ptr;
-}
-
-UPB_INLINE size_t upb_msgval_getstrlen(upb_msgval val) {
-  return val.str.len;
+UPB_INLINE upb_msgval upb_msgval_makestr(const char *data, size_t size) {
+  return upb_msgval_str(upb_stringview_make(data, size));
 }
 
 
@@ -6685,19 +6556,29 @@ size_t upb_msg_sizeof(const upb_msglayout *l);
  * upb_msg_uninit() must be called to release internally-allocated memory
  * unless the allocator is an arena that does not require freeing.
  *
+ * Please note that upb_msg_init() may return a value that is different than
+ * |msg|, so you must assign the return value and not cast your memory block
+ * to upb_msg* directly!
+ *
  * Please note that upb_msg_uninit() does *not* free any submessages, maps,
  * or arrays referred to by this message's fields.  You must free them manually
- * yourself. */
-void upb_msg_init(upb_msg *msg, const upb_msglayout *l, upb_alloc *a);
-void upb_msg_uninit(upb_msg *msg, const upb_msglayout *l);
+ * yourself.
+ *
+ * upb_msg_uninit returns the original memory block, which may be useful if
+ * you dynamically allocated it (though upb_msg_new() would normally be more
+ * appropriate in this case). */
+upb_msg *upb_msg_init(void *msg, const upb_msglayout *l, upb_alloc *a);
+void *upb_msg_uninit(upb_msg *msg, const upb_msglayout *l);
 
 /* Like upb_msg_init() / upb_msg_uninit(), except the message's memory is
  * allocated / freed from the given upb_alloc. */
 upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a);
 void upb_msg_free(upb_msg *msg, const upb_msglayout *l);
 
-/* Returns the upb_alloc for the given message. */
-upb_alloc *upb_msg_alloc(const upb_msg *msg, const upb_msglayout *l);
+/* Returns the upb_alloc for the given message.
+ * TODO(haberman): get rid of this?  Not sure we want to be storing this
+ * for every message. */
+upb_alloc *upb_msg_alloc(const upb_msg *msg);
 
 /* Packs the tree of messages rooted at "msg" into a single hunk of memory,
  * allocated from the given allocator. */
@@ -6717,25 +6598,14 @@ void *upb_msg_pack(const upb_msg *msg, const upb_msglayout *l,
  * arenas).
  */
 upb_msgval upb_msg_get(const upb_msg *msg,
-                       const upb_fielddef *f,
+                       int field_index,
                        const upb_msglayout *l);
 
 /* May only be called for fields where upb_fielddef_haspresence(f) == true. */
 bool upb_msg_has(const upb_msg *msg,
-                 const upb_fielddef *f,
+                 int field_index,
                  const upb_msglayout *l);
 
-/* Returns NULL if no field in the oneof is set. */
-const upb_fielddef *upb_msg_getoneofcase(const upb_msg *msg,
-                                         const upb_oneofdef *o,
-                                         const upb_msglayout *l);
-
-/* Returns true if any field in the oneof is set. */
-bool upb_msg_hasoneof(const upb_msg *msg,
-                      const upb_oneofdef *o,
-                      const upb_msglayout *l);
-
-
 /* Mutable message API.  May only be called by the owner of the message who
  * knows its ownership scheme and how to keep it consistent. */
 
@@ -6743,8 +6613,8 @@ bool upb_msg_hasoneof(const upb_msg *msg,
  * management: if you overwrite a pointer to a msg/array/map/string without
  * cleaning it up (or using an arena) it will leak.
  */
-bool upb_msg_set(upb_msg *msg,
-                 const upb_fielddef *f,
+void upb_msg_set(upb_msg *msg,
+                 int field_index,
                  upb_msgval val,
                  const upb_msglayout *l);
 
@@ -6755,12 +6625,7 @@ bool upb_msg_set(upb_msg *msg,
  * arrays/maps/strings/msgs that this field may have pointed to.
  */
 bool upb_msg_clearfield(upb_msg *msg,
-                        const upb_fielddef *f,
-                        const upb_msglayout *l);
-
-/* Clears all fields in the oneof such that none of them are set. */
-bool upb_msg_clearoneof(upb_msg *msg,
-                        const upb_oneofdef *o,
+                        int field_index,
                         const upb_msglayout *l);
 
 /* TODO(haberman): copyfrom()/mergefrom()? */
@@ -6873,9 +6738,980 @@ bool upb_msg_getscalarhandlerdata(const upb_handlers *h,
                                   size_t *offset,
                                   int32_t *hasbit);
 
+
+/** Interfaces for generated code *********************************************/
+
+#define UPB_NOT_IN_ONEOF UINT16_MAX
+#define UPB_NO_HASBIT UINT16_MAX
+#define UPB_NO_SUBMSG UINT16_MAX
+
+typedef struct {
+  uint32_t number;
+  uint32_t offset;  /* If in a oneof, offset of default in default_msg below. */
+  uint16_t hasbit;        /* UPB_NO_HASBIT if no hasbit. */
+  uint16_t oneof_index;   /* UPB_NOT_IN_ONEOF if not in a oneof. */
+  uint16_t submsg_index;  /* UPB_NO_SUBMSG if no submsg. */
+  uint8_t descriptortype;
+  uint8_t label;
+} upb_msglayout_fieldinit_v1;
+
+typedef struct {
+  uint32_t data_offset;
+  uint32_t case_offset;
+} upb_msglayout_oneofinit_v1;
+
+typedef struct upb_msglayout_msginit_v1 {
+  const struct upb_msglayout_msginit_v1 *const* submsgs;
+  const upb_msglayout_fieldinit_v1 *fields;
+  const upb_msglayout_oneofinit_v1 *oneofs;
+  void *default_msg;
+  /* Must be aligned to sizeof(void*).  Doesn't include internal members like
+   * unknown fields, extension dict, pointer to msglayout, etc. */
+  uint32_t size;
+  uint16_t field_count;
+  uint16_t oneof_count;
+  bool extendable;
+  bool is_proto2;
+} upb_msglayout_msginit_v1;
+
+#define UPB_ALIGN_UP_TO(val, align) ((val + (align - 1)) & -align)
+#define UPB_ALIGNED_SIZEOF(type) UPB_ALIGN_UP_TO(sizeof(type), sizeof(void*))
+
+/* Initialize/uninitialize a msglayout from a msginit.  If upb uses v1
+ * internally, this will not allocate any memory.  Should only be used by
+ * generated code. */
+upb_msglayout *upb_msglayout_frominit_v1(
+    const upb_msglayout_msginit_v1 *init, upb_alloc *a);
+void upb_msglayout_uninit_v1(upb_msglayout *layout, upb_alloc *a);
+
 UPB_END_EXTERN_C
 
 #endif /* UPB_MSG_H_ */
+
+UPB_BEGIN_EXTERN_C
+
+bool upb_decode(upb_stringview buf, void *msg,
+                const upb_msglayout_msginit_v1 *l, upb_env *env);
+
+UPB_END_EXTERN_C
+
+#endif  /* UPB_DECODE_H_ */
+/*
+** upb_encode: parsing into a upb_msg using a upb_msglayout.
+*/
+
+#ifndef UPB_ENCODE_H_
+#define UPB_ENCODE_H_
+
+
+UPB_BEGIN_EXTERN_C
+
+char *upb_encode(const void *msg, const upb_msglayout_msginit_v1 *l,
+                 upb_env *env, size_t *size);
+
+UPB_END_EXTERN_C
+
+#endif  /* UPB_ENCODE_H_ */
+/* This file was generated by upbc (the upb compiler) from the input
+ * file:
+ *
+ *     google/protobuf/descriptor.proto
+ *
+ * Do not edit -- your changes will be discarded when the file is
+ * regenerated. */
+
+#ifndef GOOGLE_PROTOBUF_DESCRIPTOR_PROTO_UPB_H_
+#define GOOGLE_PROTOBUF_DESCRIPTOR_PROTO_UPB_H_
+
+
+UPB_BEGIN_EXTERN_C
+
+struct google_protobuf_FileDescriptorSet;
+typedef struct google_protobuf_FileDescriptorSet google_protobuf_FileDescriptorSet;
+struct google_protobuf_FileDescriptorProto;
+typedef struct google_protobuf_FileDescriptorProto google_protobuf_FileDescriptorProto;
+struct google_protobuf_DescriptorProto;
+typedef struct google_protobuf_DescriptorProto google_protobuf_DescriptorProto;
+struct google_protobuf_DescriptorProto_ExtensionRange;
+typedef struct google_protobuf_DescriptorProto_ExtensionRange google_protobuf_DescriptorProto_ExtensionRange;
+struct google_protobuf_DescriptorProto_ReservedRange;
+typedef struct google_protobuf_DescriptorProto_ReservedRange google_protobuf_DescriptorProto_ReservedRange;
+struct google_protobuf_ExtensionRangeOptions;
+typedef struct google_protobuf_ExtensionRangeOptions google_protobuf_ExtensionRangeOptions;
+struct google_protobuf_FieldDescriptorProto;
+typedef struct google_protobuf_FieldDescriptorProto google_protobuf_FieldDescriptorProto;
+struct google_protobuf_OneofDescriptorProto;
+typedef struct google_protobuf_OneofDescriptorProto google_protobuf_OneofDescriptorProto;
+struct google_protobuf_EnumDescriptorProto;
+typedef struct google_protobuf_EnumDescriptorProto google_protobuf_EnumDescriptorProto;
+struct google_protobuf_EnumDescriptorProto_EnumReservedRange;
+typedef struct google_protobuf_EnumDescriptorProto_EnumReservedRange google_protobuf_EnumDescriptorProto_EnumReservedRange;
+struct google_protobuf_EnumValueDescriptorProto;
+typedef struct google_protobuf_EnumValueDescriptorProto google_protobuf_EnumValueDescriptorProto;
+struct google_protobuf_ServiceDescriptorProto;
+typedef struct google_protobuf_ServiceDescriptorProto google_protobuf_ServiceDescriptorProto;
+struct google_protobuf_MethodDescriptorProto;
+typedef struct google_protobuf_MethodDescriptorProto google_protobuf_MethodDescriptorProto;
+struct google_protobuf_FileOptions;
+typedef struct google_protobuf_FileOptions google_protobuf_FileOptions;
+struct google_protobuf_MessageOptions;
+typedef struct google_protobuf_MessageOptions google_protobuf_MessageOptions;
+struct google_protobuf_FieldOptions;
+typedef struct google_protobuf_FieldOptions google_protobuf_FieldOptions;
+struct google_protobuf_OneofOptions;
+typedef struct google_protobuf_OneofOptions google_protobuf_OneofOptions;
+struct google_protobuf_EnumOptions;
+typedef struct google_protobuf_EnumOptions google_protobuf_EnumOptions;
+struct google_protobuf_EnumValueOptions;
+typedef struct google_protobuf_EnumValueOptions google_protobuf_EnumValueOptions;
+struct google_protobuf_ServiceOptions;
+typedef struct google_protobuf_ServiceOptions google_protobuf_ServiceOptions;
+struct google_protobuf_MethodOptions;
+typedef struct google_protobuf_MethodOptions google_protobuf_MethodOptions;
+struct google_protobuf_UninterpretedOption;
+typedef struct google_protobuf_UninterpretedOption google_protobuf_UninterpretedOption;
+struct google_protobuf_UninterpretedOption_NamePart;
+typedef struct google_protobuf_UninterpretedOption_NamePart google_protobuf_UninterpretedOption_NamePart;
+struct google_protobuf_SourceCodeInfo;
+typedef struct google_protobuf_SourceCodeInfo google_protobuf_SourceCodeInfo;
+struct google_protobuf_SourceCodeInfo_Location;
+typedef struct google_protobuf_SourceCodeInfo_Location google_protobuf_SourceCodeInfo_Location;
+struct google_protobuf_GeneratedCodeInfo;
+typedef struct google_protobuf_GeneratedCodeInfo google_protobuf_GeneratedCodeInfo;
+struct google_protobuf_GeneratedCodeInfo_Annotation;
+typedef struct google_protobuf_GeneratedCodeInfo_Annotation google_protobuf_GeneratedCodeInfo_Annotation;
+/* Enums */
+
+typedef enum {
+  google_protobuf_FieldDescriptorProto_LABEL_OPTIONAL = 1,
+  google_protobuf_FieldDescriptorProto_LABEL_REQUIRED = 2,
+  google_protobuf_FieldDescriptorProto_LABEL_REPEATED = 3
+} google_protobuf_FieldDescriptorProto_Label;
+
+typedef enum {
+  google_protobuf_FieldDescriptorProto_TYPE_DOUBLE = 1,
+  google_protobuf_FieldDescriptorProto_TYPE_FLOAT = 2,
+  google_protobuf_FieldDescriptorProto_TYPE_INT64 = 3,
+  google_protobuf_FieldDescriptorProto_TYPE_UINT64 = 4,
+  google_protobuf_FieldDescriptorProto_TYPE_INT32 = 5,
+  google_protobuf_FieldDescriptorProto_TYPE_FIXED64 = 6,
+  google_protobuf_FieldDescriptorProto_TYPE_FIXED32 = 7,
+  google_protobuf_FieldDescriptorProto_TYPE_BOOL = 8,
+  google_protobuf_FieldDescriptorProto_TYPE_STRING = 9,
+  google_protobuf_FieldDescriptorProto_TYPE_GROUP = 10,
+  google_protobuf_FieldDescriptorProto_TYPE_MESSAGE = 11,
+  google_protobuf_FieldDescriptorProto_TYPE_BYTES = 12,
+  google_protobuf_FieldDescriptorProto_TYPE_UINT32 = 13,
+  google_protobuf_FieldDescriptorProto_TYPE_ENUM = 14,
+  google_protobuf_FieldDescriptorProto_TYPE_SFIXED32 = 15,
+  google_protobuf_FieldDescriptorProto_TYPE_SFIXED64 = 16,
+  google_protobuf_FieldDescriptorProto_TYPE_SINT32 = 17,
+  google_protobuf_FieldDescriptorProto_TYPE_SINT64 = 18
+} google_protobuf_FieldDescriptorProto_Type;
+
+typedef enum {
+  google_protobuf_FieldOptions_STRING = 0,
+  google_protobuf_FieldOptions_CORD = 1,
+  google_protobuf_FieldOptions_STRING_PIECE = 2
+} google_protobuf_FieldOptions_CType;
+
+typedef enum {
+  google_protobuf_FieldOptions_JS_NORMAL = 0,
+  google_protobuf_FieldOptions_JS_STRING = 1,
+  google_protobuf_FieldOptions_JS_NUMBER = 2
+} google_protobuf_FieldOptions_JSType;
+
+typedef enum {
+  google_protobuf_FileOptions_SPEED = 1,
+  google_protobuf_FileOptions_CODE_SIZE = 2,
+  google_protobuf_FileOptions_LITE_RUNTIME = 3
+} google_protobuf_FileOptions_OptimizeMode;
+
+typedef enum {
+  google_protobuf_MethodOptions_IDEMPOTENCY_UNKNOWN = 0,
+  google_protobuf_MethodOptions_NO_SIDE_EFFECTS = 1,
+  google_protobuf_MethodOptions_IDEMPOTENT = 2
+} google_protobuf_MethodOptions_IdempotencyLevel;
+
+/* google_protobuf_FileDescriptorSet */
+extern const upb_msglayout_msginit_v1 google_protobuf_FileDescriptorSet_msginit;
+google_protobuf_FileDescriptorSet *google_protobuf_FileDescriptorSet_new(upb_env *env);
+google_protobuf_FileDescriptorSet *google_protobuf_FileDescriptorSet_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_FileDescriptorSet_serialize(google_protobuf_FileDescriptorSet *msg, upb_env *env, size_t *len);
+void google_protobuf_FileDescriptorSet_free(google_protobuf_FileDescriptorSet *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_FileDescriptorSet_file(const google_protobuf_FileDescriptorSet *msg);
+
+/* setters. */
+void google_protobuf_FileDescriptorSet_set_file(google_protobuf_FileDescriptorSet *msg, upb_array* value);
+
+
+/* google_protobuf_FileDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_FileDescriptorProto_msginit;
+google_protobuf_FileDescriptorProto *google_protobuf_FileDescriptorProto_new(upb_env *env);
+google_protobuf_FileDescriptorProto *google_protobuf_FileDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_FileDescriptorProto_serialize(google_protobuf_FileDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_FileDescriptorProto_free(google_protobuf_FileDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_FileDescriptorProto_name(const google_protobuf_FileDescriptorProto *msg);
+upb_stringview google_protobuf_FileDescriptorProto_package(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_dependency(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_message_type(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_enum_type(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_service(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_extension(const google_protobuf_FileDescriptorProto *msg);
+const google_protobuf_FileOptions* google_protobuf_FileDescriptorProto_options(const google_protobuf_FileDescriptorProto *msg);
+const google_protobuf_SourceCodeInfo* google_protobuf_FileDescriptorProto_source_code_info(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_public_dependency(const google_protobuf_FileDescriptorProto *msg);
+const upb_array* google_protobuf_FileDescriptorProto_weak_dependency(const google_protobuf_FileDescriptorProto *msg);
+upb_stringview google_protobuf_FileDescriptorProto_syntax(const google_protobuf_FileDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_FileDescriptorProto_set_name(google_protobuf_FileDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FileDescriptorProto_set_package(google_protobuf_FileDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FileDescriptorProto_set_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_message_type(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_enum_type(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_service(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_extension(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_options(google_protobuf_FileDescriptorProto *msg, google_protobuf_FileOptions* value);
+void google_protobuf_FileDescriptorProto_set_source_code_info(google_protobuf_FileDescriptorProto *msg, google_protobuf_SourceCodeInfo* value);
+void google_protobuf_FileDescriptorProto_set_public_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_weak_dependency(google_protobuf_FileDescriptorProto *msg, upb_array* value);
+void google_protobuf_FileDescriptorProto_set_syntax(google_protobuf_FileDescriptorProto *msg, upb_stringview value);
+
+
+/* google_protobuf_DescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_msginit;
+google_protobuf_DescriptorProto *google_protobuf_DescriptorProto_new(upb_env *env);
+google_protobuf_DescriptorProto *google_protobuf_DescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_DescriptorProto_serialize(google_protobuf_DescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_DescriptorProto_free(google_protobuf_DescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_DescriptorProto_name(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_field(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_nested_type(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_enum_type(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_extension_range(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_extension(const google_protobuf_DescriptorProto *msg);
+const google_protobuf_MessageOptions* google_protobuf_DescriptorProto_options(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_oneof_decl(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_reserved_range(const google_protobuf_DescriptorProto *msg);
+const upb_array* google_protobuf_DescriptorProto_reserved_name(const google_protobuf_DescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_DescriptorProto_set_name(google_protobuf_DescriptorProto *msg, upb_stringview value);
+void google_protobuf_DescriptorProto_set_field(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_nested_type(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_enum_type(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_extension_range(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_extension(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_options(google_protobuf_DescriptorProto *msg, google_protobuf_MessageOptions* value);
+void google_protobuf_DescriptorProto_set_oneof_decl(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_reserved_range(google_protobuf_DescriptorProto *msg, upb_array* value);
+void google_protobuf_DescriptorProto_set_reserved_name(google_protobuf_DescriptorProto *msg, upb_array* value);
+
+
+/* google_protobuf_DescriptorProto_ExtensionRange */
+extern const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_ExtensionRange_msginit;
+google_protobuf_DescriptorProto_ExtensionRange *google_protobuf_DescriptorProto_ExtensionRange_new(upb_env *env);
+google_protobuf_DescriptorProto_ExtensionRange *google_protobuf_DescriptorProto_ExtensionRange_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_DescriptorProto_ExtensionRange_serialize(google_protobuf_DescriptorProto_ExtensionRange *msg, upb_env *env, size_t *len);
+void google_protobuf_DescriptorProto_ExtensionRange_free(google_protobuf_DescriptorProto_ExtensionRange *msg, upb_env *env);
+
+/* getters. */
+int32_t google_protobuf_DescriptorProto_ExtensionRange_start(const google_protobuf_DescriptorProto_ExtensionRange *msg);
+int32_t google_protobuf_DescriptorProto_ExtensionRange_end(const google_protobuf_DescriptorProto_ExtensionRange *msg);
+const google_protobuf_ExtensionRangeOptions* google_protobuf_DescriptorProto_ExtensionRange_options(const google_protobuf_DescriptorProto_ExtensionRange *msg);
+
+/* setters. */
+void google_protobuf_DescriptorProto_ExtensionRange_set_start(google_protobuf_DescriptorProto_ExtensionRange *msg, int32_t value);
+void google_protobuf_DescriptorProto_ExtensionRange_set_end(google_protobuf_DescriptorProto_ExtensionRange *msg, int32_t value);
+void google_protobuf_DescriptorProto_ExtensionRange_set_options(google_protobuf_DescriptorProto_ExtensionRange *msg, google_protobuf_ExtensionRangeOptions* value);
+
+
+/* google_protobuf_DescriptorProto_ReservedRange */
+extern const upb_msglayout_msginit_v1 google_protobuf_DescriptorProto_ReservedRange_msginit;
+google_protobuf_DescriptorProto_ReservedRange *google_protobuf_DescriptorProto_ReservedRange_new(upb_env *env);
+google_protobuf_DescriptorProto_ReservedRange *google_protobuf_DescriptorProto_ReservedRange_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_DescriptorProto_ReservedRange_serialize(google_protobuf_DescriptorProto_ReservedRange *msg, upb_env *env, size_t *len);
+void google_protobuf_DescriptorProto_ReservedRange_free(google_protobuf_DescriptorProto_ReservedRange *msg, upb_env *env);
+
+/* getters. */
+int32_t google_protobuf_DescriptorProto_ReservedRange_start(const google_protobuf_DescriptorProto_ReservedRange *msg);
+int32_t google_protobuf_DescriptorProto_ReservedRange_end(const google_protobuf_DescriptorProto_ReservedRange *msg);
+
+/* setters. */
+void google_protobuf_DescriptorProto_ReservedRange_set_start(google_protobuf_DescriptorProto_ReservedRange *msg, int32_t value);
+void google_protobuf_DescriptorProto_ReservedRange_set_end(google_protobuf_DescriptorProto_ReservedRange *msg, int32_t value);
+
+
+/* google_protobuf_ExtensionRangeOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_ExtensionRangeOptions_msginit;
+google_protobuf_ExtensionRangeOptions *google_protobuf_ExtensionRangeOptions_new(upb_env *env);
+google_protobuf_ExtensionRangeOptions *google_protobuf_ExtensionRangeOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_ExtensionRangeOptions_serialize(google_protobuf_ExtensionRangeOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_ExtensionRangeOptions_free(google_protobuf_ExtensionRangeOptions *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_ExtensionRangeOptions_uninterpreted_option(const google_protobuf_ExtensionRangeOptions *msg);
+
+/* setters. */
+void google_protobuf_ExtensionRangeOptions_set_uninterpreted_option(google_protobuf_ExtensionRangeOptions *msg, upb_array* value);
+
+
+/* google_protobuf_FieldDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_FieldDescriptorProto_msginit;
+google_protobuf_FieldDescriptorProto *google_protobuf_FieldDescriptorProto_new(upb_env *env);
+google_protobuf_FieldDescriptorProto *google_protobuf_FieldDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_FieldDescriptorProto_serialize(google_protobuf_FieldDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_FieldDescriptorProto_free(google_protobuf_FieldDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_FieldDescriptorProto_name(const google_protobuf_FieldDescriptorProto *msg);
+upb_stringview google_protobuf_FieldDescriptorProto_extendee(const google_protobuf_FieldDescriptorProto *msg);
+int32_t google_protobuf_FieldDescriptorProto_number(const google_protobuf_FieldDescriptorProto *msg);
+google_protobuf_FieldDescriptorProto_Label google_protobuf_FieldDescriptorProto_label(const google_protobuf_FieldDescriptorProto *msg);
+google_protobuf_FieldDescriptorProto_Type google_protobuf_FieldDescriptorProto_type(const google_protobuf_FieldDescriptorProto *msg);
+upb_stringview google_protobuf_FieldDescriptorProto_type_name(const google_protobuf_FieldDescriptorProto *msg);
+upb_stringview google_protobuf_FieldDescriptorProto_default_value(const google_protobuf_FieldDescriptorProto *msg);
+const google_protobuf_FieldOptions* google_protobuf_FieldDescriptorProto_options(const google_protobuf_FieldDescriptorProto *msg);
+int32_t google_protobuf_FieldDescriptorProto_oneof_index(const google_protobuf_FieldDescriptorProto *msg);
+upb_stringview google_protobuf_FieldDescriptorProto_json_name(const google_protobuf_FieldDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_FieldDescriptorProto_set_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FieldDescriptorProto_set_extendee(google_protobuf_FieldDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FieldDescriptorProto_set_number(google_protobuf_FieldDescriptorProto *msg, int32_t value);
+void google_protobuf_FieldDescriptorProto_set_label(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldDescriptorProto_Label value);
+void google_protobuf_FieldDescriptorProto_set_type(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldDescriptorProto_Type value);
+void google_protobuf_FieldDescriptorProto_set_type_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FieldDescriptorProto_set_default_value(google_protobuf_FieldDescriptorProto *msg, upb_stringview value);
+void google_protobuf_FieldDescriptorProto_set_options(google_protobuf_FieldDescriptorProto *msg, google_protobuf_FieldOptions* value);
+void google_protobuf_FieldDescriptorProto_set_oneof_index(google_protobuf_FieldDescriptorProto *msg, int32_t value);
+void google_protobuf_FieldDescriptorProto_set_json_name(google_protobuf_FieldDescriptorProto *msg, upb_stringview value);
+
+
+/* google_protobuf_OneofDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_OneofDescriptorProto_msginit;
+google_protobuf_OneofDescriptorProto *google_protobuf_OneofDescriptorProto_new(upb_env *env);
+google_protobuf_OneofDescriptorProto *google_protobuf_OneofDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_OneofDescriptorProto_serialize(google_protobuf_OneofDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_OneofDescriptorProto_free(google_protobuf_OneofDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_OneofDescriptorProto_name(const google_protobuf_OneofDescriptorProto *msg);
+const google_protobuf_OneofOptions* google_protobuf_OneofDescriptorProto_options(const google_protobuf_OneofDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_OneofDescriptorProto_set_name(google_protobuf_OneofDescriptorProto *msg, upb_stringview value);
+void google_protobuf_OneofDescriptorProto_set_options(google_protobuf_OneofDescriptorProto *msg, google_protobuf_OneofOptions* value);
+
+
+/* google_protobuf_EnumDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_EnumDescriptorProto_msginit;
+google_protobuf_EnumDescriptorProto *google_protobuf_EnumDescriptorProto_new(upb_env *env);
+google_protobuf_EnumDescriptorProto *google_protobuf_EnumDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_EnumDescriptorProto_serialize(google_protobuf_EnumDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_EnumDescriptorProto_free(google_protobuf_EnumDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_EnumDescriptorProto_name(const google_protobuf_EnumDescriptorProto *msg);
+const upb_array* google_protobuf_EnumDescriptorProto_value(const google_protobuf_EnumDescriptorProto *msg);
+const google_protobuf_EnumOptions* google_protobuf_EnumDescriptorProto_options(const google_protobuf_EnumDescriptorProto *msg);
+const upb_array* google_protobuf_EnumDescriptorProto_reserved_range(const google_protobuf_EnumDescriptorProto *msg);
+const upb_array* google_protobuf_EnumDescriptorProto_reserved_name(const google_protobuf_EnumDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_EnumDescriptorProto_set_name(google_protobuf_EnumDescriptorProto *msg, upb_stringview value);
+void google_protobuf_EnumDescriptorProto_set_value(google_protobuf_EnumDescriptorProto *msg, upb_array* value);
+void google_protobuf_EnumDescriptorProto_set_options(google_protobuf_EnumDescriptorProto *msg, google_protobuf_EnumOptions* value);
+void google_protobuf_EnumDescriptorProto_set_reserved_range(google_protobuf_EnumDescriptorProto *msg, upb_array* value);
+void google_protobuf_EnumDescriptorProto_set_reserved_name(google_protobuf_EnumDescriptorProto *msg, upb_array* value);
+
+
+/* google_protobuf_EnumDescriptorProto_EnumReservedRange */
+extern const upb_msglayout_msginit_v1 google_protobuf_EnumDescriptorProto_EnumReservedRange_msginit;
+google_protobuf_EnumDescriptorProto_EnumReservedRange *google_protobuf_EnumDescriptorProto_EnumReservedRange_new(upb_env *env);
+google_protobuf_EnumDescriptorProto_EnumReservedRange *google_protobuf_EnumDescriptorProto_EnumReservedRange_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_EnumDescriptorProto_EnumReservedRange_serialize(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, upb_env *env, size_t *len);
+void google_protobuf_EnumDescriptorProto_EnumReservedRange_free(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, upb_env *env);
+
+/* getters. */
+int32_t google_protobuf_EnumDescriptorProto_EnumReservedRange_start(const google_protobuf_EnumDescriptorProto_EnumReservedRange *msg);
+int32_t google_protobuf_EnumDescriptorProto_EnumReservedRange_end(const google_protobuf_EnumDescriptorProto_EnumReservedRange *msg);
+
+/* setters. */
+void google_protobuf_EnumDescriptorProto_EnumReservedRange_set_start(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, int32_t value);
+void google_protobuf_EnumDescriptorProto_EnumReservedRange_set_end(google_protobuf_EnumDescriptorProto_EnumReservedRange *msg, int32_t value);
+
+
+/* google_protobuf_EnumValueDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_EnumValueDescriptorProto_msginit;
+google_protobuf_EnumValueDescriptorProto *google_protobuf_EnumValueDescriptorProto_new(upb_env *env);
+google_protobuf_EnumValueDescriptorProto *google_protobuf_EnumValueDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_EnumValueDescriptorProto_serialize(google_protobuf_EnumValueDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_EnumValueDescriptorProto_free(google_protobuf_EnumValueDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_EnumValueDescriptorProto_name(const google_protobuf_EnumValueDescriptorProto *msg);
+int32_t google_protobuf_EnumValueDescriptorProto_number(const google_protobuf_EnumValueDescriptorProto *msg);
+const google_protobuf_EnumValueOptions* google_protobuf_EnumValueDescriptorProto_options(const google_protobuf_EnumValueDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_EnumValueDescriptorProto_set_name(google_protobuf_EnumValueDescriptorProto *msg, upb_stringview value);
+void google_protobuf_EnumValueDescriptorProto_set_number(google_protobuf_EnumValueDescriptorProto *msg, int32_t value);
+void google_protobuf_EnumValueDescriptorProto_set_options(google_protobuf_EnumValueDescriptorProto *msg, google_protobuf_EnumValueOptions* value);
+
+
+/* google_protobuf_ServiceDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_ServiceDescriptorProto_msginit;
+google_protobuf_ServiceDescriptorProto *google_protobuf_ServiceDescriptorProto_new(upb_env *env);
+google_protobuf_ServiceDescriptorProto *google_protobuf_ServiceDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_ServiceDescriptorProto_serialize(google_protobuf_ServiceDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_ServiceDescriptorProto_free(google_protobuf_ServiceDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_ServiceDescriptorProto_name(const google_protobuf_ServiceDescriptorProto *msg);
+const upb_array* google_protobuf_ServiceDescriptorProto_method(const google_protobuf_ServiceDescriptorProto *msg);
+const google_protobuf_ServiceOptions* google_protobuf_ServiceDescriptorProto_options(const google_protobuf_ServiceDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_ServiceDescriptorProto_set_name(google_protobuf_ServiceDescriptorProto *msg, upb_stringview value);
+void google_protobuf_ServiceDescriptorProto_set_method(google_protobuf_ServiceDescriptorProto *msg, upb_array* value);
+void google_protobuf_ServiceDescriptorProto_set_options(google_protobuf_ServiceDescriptorProto *msg, google_protobuf_ServiceOptions* value);
+
+
+/* google_protobuf_MethodDescriptorProto */
+extern const upb_msglayout_msginit_v1 google_protobuf_MethodDescriptorProto_msginit;
+google_protobuf_MethodDescriptorProto *google_protobuf_MethodDescriptorProto_new(upb_env *env);
+google_protobuf_MethodDescriptorProto *google_protobuf_MethodDescriptorProto_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_MethodDescriptorProto_serialize(google_protobuf_MethodDescriptorProto *msg, upb_env *env, size_t *len);
+void google_protobuf_MethodDescriptorProto_free(google_protobuf_MethodDescriptorProto *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_MethodDescriptorProto_name(const google_protobuf_MethodDescriptorProto *msg);
+upb_stringview google_protobuf_MethodDescriptorProto_input_type(const google_protobuf_MethodDescriptorProto *msg);
+upb_stringview google_protobuf_MethodDescriptorProto_output_type(const google_protobuf_MethodDescriptorProto *msg);
+const google_protobuf_MethodOptions* google_protobuf_MethodDescriptorProto_options(const google_protobuf_MethodDescriptorProto *msg);
+bool google_protobuf_MethodDescriptorProto_client_streaming(const google_protobuf_MethodDescriptorProto *msg);
+bool google_protobuf_MethodDescriptorProto_server_streaming(const google_protobuf_MethodDescriptorProto *msg);
+
+/* setters. */
+void google_protobuf_MethodDescriptorProto_set_name(google_protobuf_MethodDescriptorProto *msg, upb_stringview value);
+void google_protobuf_MethodDescriptorProto_set_input_type(google_protobuf_MethodDescriptorProto *msg, upb_stringview value);
+void google_protobuf_MethodDescriptorProto_set_output_type(google_protobuf_MethodDescriptorProto *msg, upb_stringview value);
+void google_protobuf_MethodDescriptorProto_set_options(google_protobuf_MethodDescriptorProto *msg, google_protobuf_MethodOptions* value);
+void google_protobuf_MethodDescriptorProto_set_client_streaming(google_protobuf_MethodDescriptorProto *msg, bool value);
+void google_protobuf_MethodDescriptorProto_set_server_streaming(google_protobuf_MethodDescriptorProto *msg, bool value);
+
+
+/* google_protobuf_FileOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_FileOptions_msginit;
+google_protobuf_FileOptions *google_protobuf_FileOptions_new(upb_env *env);
+google_protobuf_FileOptions *google_protobuf_FileOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_FileOptions_serialize(google_protobuf_FileOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_FileOptions_free(google_protobuf_FileOptions *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_FileOptions_java_package(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_java_outer_classname(const google_protobuf_FileOptions *msg);
+google_protobuf_FileOptions_OptimizeMode google_protobuf_FileOptions_optimize_for(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_java_multiple_files(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_go_package(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_cc_generic_services(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_java_generic_services(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_py_generic_services(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_java_generate_equals_and_hash(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_deprecated(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_java_string_check_utf8(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_cc_enable_arenas(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_objc_class_prefix(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_csharp_namespace(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_swift_prefix(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_php_class_prefix(const google_protobuf_FileOptions *msg);
+upb_stringview google_protobuf_FileOptions_php_namespace(const google_protobuf_FileOptions *msg);
+bool google_protobuf_FileOptions_php_generic_services(const google_protobuf_FileOptions *msg);
+const upb_array* google_protobuf_FileOptions_uninterpreted_option(const google_protobuf_FileOptions *msg);
+
+/* setters. */
+void google_protobuf_FileOptions_set_java_package(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_java_outer_classname(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_optimize_for(google_protobuf_FileOptions *msg, google_protobuf_FileOptions_OptimizeMode value);
+void google_protobuf_FileOptions_set_java_multiple_files(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_go_package(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_cc_generic_services(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_java_generic_services(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_py_generic_services(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_java_generate_equals_and_hash(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_deprecated(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_java_string_check_utf8(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_cc_enable_arenas(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_objc_class_prefix(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_csharp_namespace(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_swift_prefix(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_php_class_prefix(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_php_namespace(google_protobuf_FileOptions *msg, upb_stringview value);
+void google_protobuf_FileOptions_set_php_generic_services(google_protobuf_FileOptions *msg, bool value);
+void google_protobuf_FileOptions_set_uninterpreted_option(google_protobuf_FileOptions *msg, upb_array* value);
+
+
+/* google_protobuf_MessageOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_MessageOptions_msginit;
+google_protobuf_MessageOptions *google_protobuf_MessageOptions_new(upb_env *env);
+google_protobuf_MessageOptions *google_protobuf_MessageOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_MessageOptions_serialize(google_protobuf_MessageOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_MessageOptions_free(google_protobuf_MessageOptions *msg, upb_env *env);
+
+/* getters. */
+bool google_protobuf_MessageOptions_message_set_wire_format(const google_protobuf_MessageOptions *msg);
+bool google_protobuf_MessageOptions_no_standard_descriptor_accessor(const google_protobuf_MessageOptions *msg);
+bool google_protobuf_MessageOptions_deprecated(const google_protobuf_MessageOptions *msg);
+bool google_protobuf_MessageOptions_map_entry(const google_protobuf_MessageOptions *msg);
+const upb_array* google_protobuf_MessageOptions_uninterpreted_option(const google_protobuf_MessageOptions *msg);
+
+/* setters. */
+void google_protobuf_MessageOptions_set_message_set_wire_format(google_protobuf_MessageOptions *msg, bool value);
+void google_protobuf_MessageOptions_set_no_standard_descriptor_accessor(google_protobuf_MessageOptions *msg, bool value);
+void google_protobuf_MessageOptions_set_deprecated(google_protobuf_MessageOptions *msg, bool value);
+void google_protobuf_MessageOptions_set_map_entry(google_protobuf_MessageOptions *msg, bool value);
+void google_protobuf_MessageOptions_set_uninterpreted_option(google_protobuf_MessageOptions *msg, upb_array* value);
+
+
+/* google_protobuf_FieldOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_FieldOptions_msginit;
+google_protobuf_FieldOptions *google_protobuf_FieldOptions_new(upb_env *env);
+google_protobuf_FieldOptions *google_protobuf_FieldOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_FieldOptions_serialize(google_protobuf_FieldOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_FieldOptions_free(google_protobuf_FieldOptions *msg, upb_env *env);
+
+/* getters. */
+google_protobuf_FieldOptions_CType google_protobuf_FieldOptions_ctype(const google_protobuf_FieldOptions *msg);
+bool google_protobuf_FieldOptions_packed(const google_protobuf_FieldOptions *msg);
+bool google_protobuf_FieldOptions_deprecated(const google_protobuf_FieldOptions *msg);
+bool google_protobuf_FieldOptions_lazy(const google_protobuf_FieldOptions *msg);
+google_protobuf_FieldOptions_JSType google_protobuf_FieldOptions_jstype(const google_protobuf_FieldOptions *msg);
+bool google_protobuf_FieldOptions_weak(const google_protobuf_FieldOptions *msg);
+const upb_array* google_protobuf_FieldOptions_uninterpreted_option(const google_protobuf_FieldOptions *msg);
+
+/* setters. */
+void google_protobuf_FieldOptions_set_ctype(google_protobuf_FieldOptions *msg, google_protobuf_FieldOptions_CType value);
+void google_protobuf_FieldOptions_set_packed(google_protobuf_FieldOptions *msg, bool value);
+void google_protobuf_FieldOptions_set_deprecated(google_protobuf_FieldOptions *msg, bool value);
+void google_protobuf_FieldOptions_set_lazy(google_protobuf_FieldOptions *msg, bool value);
+void google_protobuf_FieldOptions_set_jstype(google_protobuf_FieldOptions *msg, google_protobuf_FieldOptions_JSType value);
+void google_protobuf_FieldOptions_set_weak(google_protobuf_FieldOptions *msg, bool value);
+void google_protobuf_FieldOptions_set_uninterpreted_option(google_protobuf_FieldOptions *msg, upb_array* value);
+
+
+/* google_protobuf_OneofOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_OneofOptions_msginit;
+google_protobuf_OneofOptions *google_protobuf_OneofOptions_new(upb_env *env);
+google_protobuf_OneofOptions *google_protobuf_OneofOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_OneofOptions_serialize(google_protobuf_OneofOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_OneofOptions_free(google_protobuf_OneofOptions *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_OneofOptions_uninterpreted_option(const google_protobuf_OneofOptions *msg);
+
+/* setters. */
+void google_protobuf_OneofOptions_set_uninterpreted_option(google_protobuf_OneofOptions *msg, upb_array* value);
+
+
+/* google_protobuf_EnumOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_EnumOptions_msginit;
+google_protobuf_EnumOptions *google_protobuf_EnumOptions_new(upb_env *env);
+google_protobuf_EnumOptions *google_protobuf_EnumOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_EnumOptions_serialize(google_protobuf_EnumOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_EnumOptions_free(google_protobuf_EnumOptions *msg, upb_env *env);
+
+/* getters. */
+bool google_protobuf_EnumOptions_allow_alias(const google_protobuf_EnumOptions *msg);
+bool google_protobuf_EnumOptions_deprecated(const google_protobuf_EnumOptions *msg);
+const upb_array* google_protobuf_EnumOptions_uninterpreted_option(const google_protobuf_EnumOptions *msg);
+
+/* setters. */
+void google_protobuf_EnumOptions_set_allow_alias(google_protobuf_EnumOptions *msg, bool value);
+void google_protobuf_EnumOptions_set_deprecated(google_protobuf_EnumOptions *msg, bool value);
+void google_protobuf_EnumOptions_set_uninterpreted_option(google_protobuf_EnumOptions *msg, upb_array* value);
+
+
+/* google_protobuf_EnumValueOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_EnumValueOptions_msginit;
+google_protobuf_EnumValueOptions *google_protobuf_EnumValueOptions_new(upb_env *env);
+google_protobuf_EnumValueOptions *google_protobuf_EnumValueOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_EnumValueOptions_serialize(google_protobuf_EnumValueOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_EnumValueOptions_free(google_protobuf_EnumValueOptions *msg, upb_env *env);
+
+/* getters. */
+bool google_protobuf_EnumValueOptions_deprecated(const google_protobuf_EnumValueOptions *msg);
+const upb_array* google_protobuf_EnumValueOptions_uninterpreted_option(const google_protobuf_EnumValueOptions *msg);
+
+/* setters. */
+void google_protobuf_EnumValueOptions_set_deprecated(google_protobuf_EnumValueOptions *msg, bool value);
+void google_protobuf_EnumValueOptions_set_uninterpreted_option(google_protobuf_EnumValueOptions *msg, upb_array* value);
+
+
+/* google_protobuf_ServiceOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_ServiceOptions_msginit;
+google_protobuf_ServiceOptions *google_protobuf_ServiceOptions_new(upb_env *env);
+google_protobuf_ServiceOptions *google_protobuf_ServiceOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_ServiceOptions_serialize(google_protobuf_ServiceOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_ServiceOptions_free(google_protobuf_ServiceOptions *msg, upb_env *env);
+
+/* getters. */
+bool google_protobuf_ServiceOptions_deprecated(const google_protobuf_ServiceOptions *msg);
+const upb_array* google_protobuf_ServiceOptions_uninterpreted_option(const google_protobuf_ServiceOptions *msg);
+
+/* setters. */
+void google_protobuf_ServiceOptions_set_deprecated(google_protobuf_ServiceOptions *msg, bool value);
+void google_protobuf_ServiceOptions_set_uninterpreted_option(google_protobuf_ServiceOptions *msg, upb_array* value);
+
+
+/* google_protobuf_MethodOptions */
+extern const upb_msglayout_msginit_v1 google_protobuf_MethodOptions_msginit;
+google_protobuf_MethodOptions *google_protobuf_MethodOptions_new(upb_env *env);
+google_protobuf_MethodOptions *google_protobuf_MethodOptions_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_MethodOptions_serialize(google_protobuf_MethodOptions *msg, upb_env *env, size_t *len);
+void google_protobuf_MethodOptions_free(google_protobuf_MethodOptions *msg, upb_env *env);
+
+/* getters. */
+bool google_protobuf_MethodOptions_deprecated(const google_protobuf_MethodOptions *msg);
+google_protobuf_MethodOptions_IdempotencyLevel google_protobuf_MethodOptions_idempotency_level(const google_protobuf_MethodOptions *msg);
+const upb_array* google_protobuf_MethodOptions_uninterpreted_option(const google_protobuf_MethodOptions *msg);
+
+/* setters. */
+void google_protobuf_MethodOptions_set_deprecated(google_protobuf_MethodOptions *msg, bool value);
+void google_protobuf_MethodOptions_set_idempotency_level(google_protobuf_MethodOptions *msg, google_protobuf_MethodOptions_IdempotencyLevel value);
+void google_protobuf_MethodOptions_set_uninterpreted_option(google_protobuf_MethodOptions *msg, upb_array* value);
+
+
+/* google_protobuf_UninterpretedOption */
+extern const upb_msglayout_msginit_v1 google_protobuf_UninterpretedOption_msginit;
+google_protobuf_UninterpretedOption *google_protobuf_UninterpretedOption_new(upb_env *env);
+google_protobuf_UninterpretedOption *google_protobuf_UninterpretedOption_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_UninterpretedOption_serialize(google_protobuf_UninterpretedOption *msg, upb_env *env, size_t *len);
+void google_protobuf_UninterpretedOption_free(google_protobuf_UninterpretedOption *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_UninterpretedOption_name(const google_protobuf_UninterpretedOption *msg);
+upb_stringview google_protobuf_UninterpretedOption_identifier_value(const google_protobuf_UninterpretedOption *msg);
+uint64_t google_protobuf_UninterpretedOption_positive_int_value(const google_protobuf_UninterpretedOption *msg);
+int64_t google_protobuf_UninterpretedOption_negative_int_value(const google_protobuf_UninterpretedOption *msg);
+double google_protobuf_UninterpretedOption_double_value(const google_protobuf_UninterpretedOption *msg);
+upb_stringview google_protobuf_UninterpretedOption_string_value(const google_protobuf_UninterpretedOption *msg);
+upb_stringview google_protobuf_UninterpretedOption_aggregate_value(const google_protobuf_UninterpretedOption *msg);
+
+/* setters. */
+void google_protobuf_UninterpretedOption_set_name(google_protobuf_UninterpretedOption *msg, upb_array* value);
+void google_protobuf_UninterpretedOption_set_identifier_value(google_protobuf_UninterpretedOption *msg, upb_stringview value);
+void google_protobuf_UninterpretedOption_set_positive_int_value(google_protobuf_UninterpretedOption *msg, uint64_t value);
+void google_protobuf_UninterpretedOption_set_negative_int_value(google_protobuf_UninterpretedOption *msg, int64_t value);
+void google_protobuf_UninterpretedOption_set_double_value(google_protobuf_UninterpretedOption *msg, double value);
+void google_protobuf_UninterpretedOption_set_string_value(google_protobuf_UninterpretedOption *msg, upb_stringview value);
+void google_protobuf_UninterpretedOption_set_aggregate_value(google_protobuf_UninterpretedOption *msg, upb_stringview value);
+
+
+/* google_protobuf_UninterpretedOption_NamePart */
+extern const upb_msglayout_msginit_v1 google_protobuf_UninterpretedOption_NamePart_msginit;
+google_protobuf_UninterpretedOption_NamePart *google_protobuf_UninterpretedOption_NamePart_new(upb_env *env);
+google_protobuf_UninterpretedOption_NamePart *google_protobuf_UninterpretedOption_NamePart_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_UninterpretedOption_NamePart_serialize(google_protobuf_UninterpretedOption_NamePart *msg, upb_env *env, size_t *len);
+void google_protobuf_UninterpretedOption_NamePart_free(google_protobuf_UninterpretedOption_NamePart *msg, upb_env *env);
+
+/* getters. */
+upb_stringview google_protobuf_UninterpretedOption_NamePart_name_part(const google_protobuf_UninterpretedOption_NamePart *msg);
+bool google_protobuf_UninterpretedOption_NamePart_is_extension(const google_protobuf_UninterpretedOption_NamePart *msg);
+
+/* setters. */
+void google_protobuf_UninterpretedOption_NamePart_set_name_part(google_protobuf_UninterpretedOption_NamePart *msg, upb_stringview value);
+void google_protobuf_UninterpretedOption_NamePart_set_is_extension(google_protobuf_UninterpretedOption_NamePart *msg, bool value);
+
+
+/* google_protobuf_SourceCodeInfo */
+extern const upb_msglayout_msginit_v1 google_protobuf_SourceCodeInfo_msginit;
+google_protobuf_SourceCodeInfo *google_protobuf_SourceCodeInfo_new(upb_env *env);
+google_protobuf_SourceCodeInfo *google_protobuf_SourceCodeInfo_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_SourceCodeInfo_serialize(google_protobuf_SourceCodeInfo *msg, upb_env *env, size_t *len);
+void google_protobuf_SourceCodeInfo_free(google_protobuf_SourceCodeInfo *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_SourceCodeInfo_location(const google_protobuf_SourceCodeInfo *msg);
+
+/* setters. */
+void google_protobuf_SourceCodeInfo_set_location(google_protobuf_SourceCodeInfo *msg, upb_array* value);
+
+
+/* google_protobuf_SourceCodeInfo_Location */
+extern const upb_msglayout_msginit_v1 google_protobuf_SourceCodeInfo_Location_msginit;
+google_protobuf_SourceCodeInfo_Location *google_protobuf_SourceCodeInfo_Location_new(upb_env *env);
+google_protobuf_SourceCodeInfo_Location *google_protobuf_SourceCodeInfo_Location_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_SourceCodeInfo_Location_serialize(google_protobuf_SourceCodeInfo_Location *msg, upb_env *env, size_t *len);
+void google_protobuf_SourceCodeInfo_Location_free(google_protobuf_SourceCodeInfo_Location *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_SourceCodeInfo_Location_path(const google_protobuf_SourceCodeInfo_Location *msg);
+const upb_array* google_protobuf_SourceCodeInfo_Location_span(const google_protobuf_SourceCodeInfo_Location *msg);
+upb_stringview google_protobuf_SourceCodeInfo_Location_leading_comments(const google_protobuf_SourceCodeInfo_Location *msg);
+upb_stringview google_protobuf_SourceCodeInfo_Location_trailing_comments(const google_protobuf_SourceCodeInfo_Location *msg);
+const upb_array* google_protobuf_SourceCodeInfo_Location_leading_detached_comments(const google_protobuf_SourceCodeInfo_Location *msg);
+
+/* setters. */
+void google_protobuf_SourceCodeInfo_Location_set_path(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value);
+void google_protobuf_SourceCodeInfo_Location_set_span(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value);
+void google_protobuf_SourceCodeInfo_Location_set_leading_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_stringview value);
+void google_protobuf_SourceCodeInfo_Location_set_trailing_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_stringview value);
+void google_protobuf_SourceCodeInfo_Location_set_leading_detached_comments(google_protobuf_SourceCodeInfo_Location *msg, upb_array* value);
+
+
+/* google_protobuf_GeneratedCodeInfo */
+extern const upb_msglayout_msginit_v1 google_protobuf_GeneratedCodeInfo_msginit;
+google_protobuf_GeneratedCodeInfo *google_protobuf_GeneratedCodeInfo_new(upb_env *env);
+google_protobuf_GeneratedCodeInfo *google_protobuf_GeneratedCodeInfo_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_GeneratedCodeInfo_serialize(google_protobuf_GeneratedCodeInfo *msg, upb_env *env, size_t *len);
+void google_protobuf_GeneratedCodeInfo_free(google_protobuf_GeneratedCodeInfo *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_GeneratedCodeInfo_annotation(const google_protobuf_GeneratedCodeInfo *msg);
+
+/* setters. */
+void google_protobuf_GeneratedCodeInfo_set_annotation(google_protobuf_GeneratedCodeInfo *msg, upb_array* value);
+
+
+/* google_protobuf_GeneratedCodeInfo_Annotation */
+extern const upb_msglayout_msginit_v1 google_protobuf_GeneratedCodeInfo_Annotation_msginit;
+google_protobuf_GeneratedCodeInfo_Annotation *google_protobuf_GeneratedCodeInfo_Annotation_new(upb_env *env);
+google_protobuf_GeneratedCodeInfo_Annotation *google_protobuf_GeneratedCodeInfo_Annotation_parsenew(upb_stringview buf, upb_env *env);
+char *google_protobuf_GeneratedCodeInfo_Annotation_serialize(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_env *env, size_t *len);
+void google_protobuf_GeneratedCodeInfo_Annotation_free(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_env *env);
+
+/* getters. */
+const upb_array* google_protobuf_GeneratedCodeInfo_Annotation_path(const google_protobuf_GeneratedCodeInfo_Annotation *msg);
+upb_stringview google_protobuf_GeneratedCodeInfo_Annotation_source_file(const google_protobuf_GeneratedCodeInfo_Annotation *msg);
+int32_t google_protobuf_GeneratedCodeInfo_Annotation_begin(const google_protobuf_GeneratedCodeInfo_Annotation *msg);
+int32_t google_protobuf_GeneratedCodeInfo_Annotation_end(const google_protobuf_GeneratedCodeInfo_Annotation *msg);
+
+/* setters. */
+void google_protobuf_GeneratedCodeInfo_Annotation_set_path(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_array* value);
+void google_protobuf_GeneratedCodeInfo_Annotation_set_source_file(google_protobuf_GeneratedCodeInfo_Annotation *msg, upb_stringview value);
+void google_protobuf_GeneratedCodeInfo_Annotation_set_begin(google_protobuf_GeneratedCodeInfo_Annotation *msg, int32_t value);
+void google_protobuf_GeneratedCodeInfo_Annotation_set_end(google_protobuf_GeneratedCodeInfo_Annotation *msg, int32_t value);
+
+
+UPB_END_EXTERN_C
+
+#endif  /* GOOGLE_PROTOBUF_DESCRIPTOR_PROTO_UPB_H_ */
+/*
+** structs.int.h: structures definitions that are internal to upb.
+*/
+
+#ifndef UPB_STRUCTS_H_
+#define UPB_STRUCTS_H_
+
+struct upb_array {
+  upb_fieldtype_t type;
+  uint8_t element_size;
+  void *data;   /* Each element is element_size. */
+  size_t len;   /* Measured in elements. */
+  size_t size;  /* Measured in elements. */
+  upb_alloc *alloc;
+};
+
+#endif  /* UPB_STRUCTS_H_ */
+
+/*
+** This file contains definitions of structs that should be considered private
+** and NOT stable across versions of upb.
+**
+** The only reason they are declared here and not in .c files is to allow upb
+** and the application (if desired) to embed statically-initialized instances
+** of structures like defs.
+**
+** If you include this file, all guarantees of ABI compatibility go out the
+** window!  Any code that includes this file needs to recompile against the
+** exact same version of upb that they are linking against.
+**
+** You also need to recompile if you change the value of the UPB_DEBUG_REFS
+** flag.
+*/
+
+
+#ifndef UPB_STATICINIT_H_
+#define UPB_STATICINIT_H_
+
+#ifdef __cplusplus
+/* Because of how we do our typedefs, this header can't be included from C++. */
+#error This file cannot be included from C++
+#endif
+
+/* upb_refcounted *************************************************************/
+
+
+/* upb_def ********************************************************************/
+
+struct upb_def {
+  upb_refcounted base;
+
+  const char *fullname;
+  const upb_filedef* file;
+  char type;  /* A upb_deftype_t (char to save space) */
+
+  /* Used as a flag during the def's mutable stage.  Must be false unless
+   * it is currently being used by a function on the stack.  This allows
+   * us to easily determine which defs were passed into the function's
+   * current invocation. */
+  bool came_from_user;
+};
+
+#define UPB_DEF_INIT(name, type, vtbl, refs, ref2s) \
+    { UPB_REFCOUNT_INIT(vtbl, refs, ref2s), name, NULL, type, false }
+
+
+/* upb_fielddef ***************************************************************/
+
+struct upb_fielddef {
+  upb_def base;
+
+  union {
+    int64_t sint;
+    uint64_t uint;
+    double dbl;
+    float flt;
+    void *bytes;
+  } defaultval;
+  union {
+    const upb_msgdef *def;  /* If !msg_is_symbolic. */
+    char *name;             /* If msg_is_symbolic. */
+  } msg;
+  union {
+    const upb_def *def;  /* If !subdef_is_symbolic. */
+    char *name;          /* If subdef_is_symbolic. */
+  } sub;  /* The msgdef or enumdef for this field, if upb_hassubdef(f). */
+  bool subdef_is_symbolic;
+  bool msg_is_symbolic;
+  const upb_oneofdef *oneof;
+  bool default_is_string;
+  bool type_is_set_;     /* False until type is explicitly set. */
+  bool is_extension_;
+  bool lazy_;
+  bool packed_;
+  upb_intfmt_t intfmt;
+  bool tagdelim;
+  upb_fieldtype_t type_;
+  upb_label_t label_;
+  uint32_t number_;
+  uint32_t selector_base;  /* Used to index into a upb::Handlers table. */
+  uint32_t index_;
+};
+
+extern const struct upb_refcounted_vtbl upb_fielddef_vtbl;
+
+#define UPB_FIELDDEF_INIT(label, type, intfmt, tagdelim, is_extension, lazy,   \
+                          packed, name, num, msgdef, subdef, selector_base,    \
+                          index, defaultval, refs, ref2s)                      \
+  {                                                                            \
+    UPB_DEF_INIT(name, UPB_DEF_FIELD, &upb_fielddef_vtbl, refs, ref2s),        \
+        defaultval, {msgdef}, {subdef}, NULL, false, false,                    \
+        type == UPB_TYPE_STRING || type == UPB_TYPE_BYTES, true, is_extension, \
+        lazy, packed, intfmt, tagdelim, type, label, num, selector_base, index \
+  }
+
+
+/* upb_msgdef *****************************************************************/
+
+struct upb_msgdef {
+  upb_def base;
+
+  size_t selector_count;
+  uint32_t submsg_field_count;
+
+  /* Tables for looking up fields by number and name. */
+  upb_inttable itof;  /* int to field */
+  upb_strtable ntof;  /* name to field/oneof */
+
+  /* Is this a map-entry message? */
+  bool map_entry;
+
+  /* Whether this message has proto2 or proto3 semantics. */
+  upb_syntax_t syntax;
+
+  /* TODO(haberman): proper extension ranges (there can be multiple). */
+};
+
+extern const struct upb_refcounted_vtbl upb_msgdef_vtbl;
+
+/* TODO: also support static initialization of the oneofs table. This will be
+ * needed if we compile in descriptors that contain oneofs. */
+#define UPB_MSGDEF_INIT(name, selector_count, submsg_field_count, itof, ntof, \
+                        map_entry, syntax, refs, ref2s)                       \
+  {                                                                           \
+    UPB_DEF_INIT(name, UPB_DEF_MSG, &upb_fielddef_vtbl, refs, ref2s),         \
+        selector_count, submsg_field_count, itof, ntof, map_entry, syntax     \
+  }
+
+
+/* upb_enumdef ****************************************************************/
+
+struct upb_enumdef {
+  upb_def base;
+
+  upb_strtable ntoi;
+  upb_inttable iton;
+  int32_t defaultval;
+};
+
+extern const struct upb_refcounted_vtbl upb_enumdef_vtbl;
+
+#define UPB_ENUMDEF_INIT(name, ntoi, iton, defaultval, refs, ref2s) \
+  { UPB_DEF_INIT(name, UPB_DEF_ENUM, &upb_enumdef_vtbl, refs, ref2s), ntoi,    \
+    iton, defaultval }
+
+
+/* upb_oneofdef ***************************************************************/
+
+struct upb_oneofdef {
+  upb_refcounted base;
+
+  uint32_t index;  /* Index within oneofs. */
+  const char *name;
+  upb_strtable ntof;
+  upb_inttable itof;
+  const upb_msgdef *parent;
+};
+
+extern const struct upb_refcounted_vtbl upb_oneofdef_vtbl;
+
+#define UPB_ONEOFDEF_INIT(name, ntof, itof, refs, ref2s) \
+  { UPB_REFCOUNT_INIT(&upb_oneofdef_vtbl, refs, ref2s), 0, name, ntof, itof }
+
+
+/* upb_symtab *****************************************************************/
+
+struct upb_symtab {
+  upb_refcounted base;
+
+  upb_strtable symtab;
+};
+
+struct upb_filedef {
+  upb_refcounted base;
+
+  const char *name;
+  const char *package;
+  const char *phpprefix;
+  const char *phpnamespace;
+  upb_syntax_t syntax;
+
+  upb_inttable defs;
+  upb_inttable deps;
+};
+
+extern const struct upb_refcounted_vtbl upb_filedef_vtbl;
+
+#endif  /* UPB_STATICINIT_H_ */
 /*
 ** upb::descriptor::Reader (upb_descreader)
 **
@@ -6978,53 +7814,6 @@ inline FileDef* Reader::file(size_t i) const {
 
 UPB_BEGIN_EXTERN_C
 
-/* Enums */
-
-typedef enum {
-  google_protobuf_FieldDescriptorProto_LABEL_OPTIONAL = 1,
-  google_protobuf_FieldDescriptorProto_LABEL_REQUIRED = 2,
-  google_protobuf_FieldDescriptorProto_LABEL_REPEATED = 3
-} google_protobuf_FieldDescriptorProto_Label;
-
-typedef enum {
-  google_protobuf_FieldDescriptorProto_TYPE_DOUBLE = 1,
-  google_protobuf_FieldDescriptorProto_TYPE_FLOAT = 2,
-  google_protobuf_FieldDescriptorProto_TYPE_INT64 = 3,
-  google_protobuf_FieldDescriptorProto_TYPE_UINT64 = 4,
-  google_protobuf_FieldDescriptorProto_TYPE_INT32 = 5,
-  google_protobuf_FieldDescriptorProto_TYPE_FIXED64 = 6,
-  google_protobuf_FieldDescriptorProto_TYPE_FIXED32 = 7,
-  google_protobuf_FieldDescriptorProto_TYPE_BOOL = 8,
-  google_protobuf_FieldDescriptorProto_TYPE_STRING = 9,
-  google_protobuf_FieldDescriptorProto_TYPE_GROUP = 10,
-  google_protobuf_FieldDescriptorProto_TYPE_MESSAGE = 11,
-  google_protobuf_FieldDescriptorProto_TYPE_BYTES = 12,
-  google_protobuf_FieldDescriptorProto_TYPE_UINT32 = 13,
-  google_protobuf_FieldDescriptorProto_TYPE_ENUM = 14,
-  google_protobuf_FieldDescriptorProto_TYPE_SFIXED32 = 15,
-  google_protobuf_FieldDescriptorProto_TYPE_SFIXED64 = 16,
-  google_protobuf_FieldDescriptorProto_TYPE_SINT32 = 17,
-  google_protobuf_FieldDescriptorProto_TYPE_SINT64 = 18
-} google_protobuf_FieldDescriptorProto_Type;
-
-typedef enum {
-  google_protobuf_FieldOptions_STRING = 0,
-  google_protobuf_FieldOptions_CORD = 1,
-  google_protobuf_FieldOptions_STRING_PIECE = 2
-} google_protobuf_FieldOptions_CType;
-
-typedef enum {
-  google_protobuf_FieldOptions_JS_NORMAL = 0,
-  google_protobuf_FieldOptions_JS_STRING = 1,
-  google_protobuf_FieldOptions_JS_NUMBER = 2
-} google_protobuf_FieldOptions_JSType;
-
-typedef enum {
-  google_protobuf_FileOptions_SPEED = 1,
-  google_protobuf_FileOptions_CODE_SIZE = 2,
-  google_protobuf_FileOptions_LITE_RUNTIME = 3
-} google_protobuf_FileOptions_OptimizeMode;
-
 /* MessageDefs: call these functions to get a ref to a msgdef. */
 const upb_msgdef *upbdefs_google_protobuf_DescriptorProto_get(const void *owner);
 const upb_msgdef *upbdefs_google_protobuf_DescriptorProto_ExtensionRange_get(const void *owner);
@@ -7212,6 +8001,8 @@ UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_java_string
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_javanano_use_deprecated_package(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 38); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_objc_class_prefix(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 36); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_optimize_for(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 9); }
+UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_php_class_prefix(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 40); }
+UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_php_namespace(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 41); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_py_generic_services(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 18); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_uninterpreted_option(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 999); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_MessageOptions_f_deprecated(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_MessageOptions_is(m)); return upb_msgdef_itof(m, 3); }
@@ -8263,21 +9054,9 @@ UPB_INLINE void upb_pbdecoder_unpackdispatch(uint64_t dispatch, uint64_t *ofs,
 extern "C" {
 #endif
 
-/* A list of types as they are encoded on-the-wire. */
-typedef enum {
-  UPB_WIRE_TYPE_VARINT      = 0,
-  UPB_WIRE_TYPE_64BIT       = 1,
-  UPB_WIRE_TYPE_DELIMITED   = 2,
-  UPB_WIRE_TYPE_START_GROUP = 3,
-  UPB_WIRE_TYPE_END_GROUP   = 4,
-  UPB_WIRE_TYPE_32BIT       = 5
-} upb_wiretype_t;
-
 #define UPB_MAX_WIRE_TYPE 5
 
-/* The maximum number of bytes that it takes to encode a 64-bit varint.
- * Note that with a better encoding this could be 9 (TODO: write up a
- * wiki document about this). */
+/* The maximum number of bytes that it takes to encode a 64-bit varint. */
 #define UPB_PB_VARINT_MAX_LEN 10
 
 /* Array of the "native" (ie. non-packed-repeated) wire type for the given a
@@ -8310,16 +9089,8 @@ UPB_INLINE upb_decoderet upb_decoderet_make(const char *p, uint64_t val) {
   return ret;
 }
 
-/* Four functions for decoding a varint of at most eight bytes.  They are all
- * functionally identical, but are implemented in different ways and likely have
- * different performance profiles.  We keep them around for performance testing.
- *
- * Note that these functions may not read byte-by-byte, so they must not be used
- * unless there are at least eight bytes left in the buffer! */
 upb_decoderet upb_vdecode_max8_branch32(upb_decoderet r);
 upb_decoderet upb_vdecode_max8_branch64(upb_decoderet r);
-upb_decoderet upb_vdecode_max8_wright(upb_decoderet r);
-upb_decoderet upb_vdecode_max8_massimino(upb_decoderet r);
 
 /* Template for a function that checks the first two bytes with branching
  * and dispatches 2-10 bytes with a separate function.  Note that this may read
@@ -8344,8 +9115,6 @@ UPB_INLINE upb_decoderet upb_vdecode_check2_ ## name(const char *_p) {         \
 
 UPB_VARINT_DECODER_CHECK2(branch32, upb_vdecode_max8_branch32)
 UPB_VARINT_DECODER_CHECK2(branch64, upb_vdecode_max8_branch64)
-UPB_VARINT_DECODER_CHECK2(wright, upb_vdecode_max8_wright)
-UPB_VARINT_DECODER_CHECK2(massimino, upb_vdecode_max8_massimino)
 #undef UPB_VARINT_DECODER_CHECK2
 
 /* Our canonical functions for decoding varints, based on the currently
@@ -8357,10 +9126,6 @@ UPB_INLINE upb_decoderet upb_vdecode_fast(const char *p) {
     return upb_vdecode_check2_branch32(p);
 }
 
-UPB_INLINE upb_decoderet upb_vdecode_max8_fast(upb_decoderet r) {
-  return upb_vdecode_max8_massimino(r);
-}
-
 
 /* Encoding *******************************************************************/
 
diff --git a/php/generate_descriptor_protos.sh b/php/generate_descriptor_protos.sh
new file mode 100755
index 00000000..372ad69c
--- /dev/null
+++ b/php/generate_descriptor_protos.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# Run this script to regenerate desriptor protos after the protocol compiler
+# changes.
+
+if test ! -e src/google/protobuf/stubs/common.h; then
+  cat >&2 << __EOF__
+Could not find source code.  Make sure you are running this script from the
+root of the distribution tree.
+__EOF__
+  exit 1
+fi
+
+pushd src
+./protoc --php_out=internal:../php/src google/protobuf/descriptor.proto
+popd
diff --git a/php/phpunit.xml b/php/phpunit.xml
index 0191a601..87440bbd 100644
--- a/php/phpunit.xml
+++ b/php/phpunit.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./vendor/autoload.php"
+<phpunit bootstrap="./tests/bootstrap_phpunit.php"
          colors="true">
   <testsuites>
     <testsuite name="protobuf-tests">
@@ -7,8 +7,11 @@
       <file>tests/array_test.php</file>
       <file>tests/encode_decode_test.php</file>
       <file>tests/generated_class_test.php</file>
+      <file>tests/generated_phpdoc_test.php</file>
       <file>tests/map_field_test.php</file>
       <file>tests/well_known_test.php</file>
+      <file>tests/descriptors_test.php</file>
+      <file>tests/generated_service_test.php</file>
     </testsuite>
   </testsuites>
 </phpunit>
diff --git a/php/src/GPBMetadata/Google/Protobuf/Any.php b/php/src/GPBMetadata/Google/Protobuf/Any.php
new file mode 100644
index 00000000..22cc2500
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Any.php
@@ -0,0 +1,30 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/any.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Any
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0acd010a19676f6f676c652f70726f746f6275662f616e792e70726f746f" .
+            "120f676f6f676c652e70726f746f62756622260a03416e7912100a087479" .
+            "70655f75726c180120012809120d0a0576616c756518022001280c426f0a" .
+            "13636f6d2e676f6f676c652e70726f746f6275664208416e7950726f746f" .
+            "50015a256769746875622e636f6d2f676f6c616e672f70726f746f627566" .
+            "2f7074797065732f616e79a20203475042aa021e476f6f676c652e50726f" .
+            "746f6275662e57656c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Api.php b/php/src/GPBMetadata/Google/Protobuf/Api.php
new file mode 100644
index 00000000..b18e0d33
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Api.php
@@ -0,0 +1,49 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/api.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Api
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        \GPBMetadata\Google\Protobuf\SourceContext::initOnce();
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0ac8050a19676f6f676c652f70726f746f6275662f6170692e70726f746f" .
+            "120f676f6f676c652e70726f746f6275661a1a676f6f676c652f70726f74" .
+            "6f6275662f747970652e70726f746f2281020a03417069120c0a046e616d" .
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+            "676c652e70726f746f6275662e4d6574686f6412280a076f7074696f6e73" .
+            "18032003280b32172e676f6f676c652e70726f746f6275662e4f7074696f" .
+            "6e120f0a0776657273696f6e18042001280912360a0e736f757263655f63" .
+            "6f6e7465787418052001280b321e2e676f6f676c652e70726f746f627566" .
+            "2e536f75726365436f6e7465787412260a066d6978696e7318062003280b" .
+            "32162e676f6f676c652e70726f746f6275662e4d6978696e12270a067379" .
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+            "73655f73747265616d696e6718052001280812280a076f7074696f6e7318" .
+            "062003280b32172e676f6f676c652e70726f746f6275662e4f7074696f6e" .
+            "12270a0673796e74617818072001280e32172e676f6f676c652e70726f74" .
+            "6f6275662e53796e74617822230a054d6978696e120c0a046e616d651801" .
+            "20012809120c0a04726f6f7418022001280942750a13636f6d2e676f6f67" .
+            "6c652e70726f746f627566420841706950726f746f50015a2b676f6f676c" .
+            "652e676f6c616e672e6f72672f67656e70726f746f2f70726f746f627566" .
+            "2f6170693b617069a20203475042aa021e476f6f676c652e50726f746f62" .
+            "75662e57656c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Duration.php b/php/src/GPBMetadata/Google/Protobuf/Duration.php
new file mode 100644
index 00000000..b1c85ad8
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Duration.php
@@ -0,0 +1,31 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/duration.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Duration
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0ae3010a1e676f6f676c652f70726f746f6275662f6475726174696f6e2e" .
+            "70726f746f120f676f6f676c652e70726f746f627566222a0a0844757261" .
+            "74696f6e120f0a077365636f6e6473180120012803120d0a056e616e6f73" .
+            "180220012805427c0a13636f6d2e676f6f676c652e70726f746f62756642" .
+            "0d4475726174696f6e50726f746f50015a2a6769746875622e636f6d2f67" .
+            "6f6c616e672f70726f746f6275662f7074797065732f6475726174696f6e" .
+            "f80101a20203475042aa021e476f6f676c652e50726f746f6275662e5765" .
+            "6c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/FieldMask.php b/php/src/GPBMetadata/Google/Protobuf/FieldMask.php
new file mode 100644
index 00000000..5812be1e
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/FieldMask.php
@@ -0,0 +1,31 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/field_mask.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class FieldMask
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0ae3010a20676f6f676c652f70726f746f6275662f6669656c645f6d6173" .
+            "6b2e70726f746f120f676f6f676c652e70726f746f627566221a0a094669" .
+            "656c644d61736b120d0a0570617468731801200328094289010a13636f6d" .
+            "2e676f6f676c652e70726f746f627566420e4669656c644d61736b50726f" .
+            "746f50015a39676f6f676c652e676f6c616e672e6f72672f67656e70726f" .
+            "746f2f70726f746f6275662f6669656c645f6d61736b3b6669656c645f6d" .
+            "61736ba20203475042aa021e476f6f676c652e50726f746f6275662e5765" .
+            "6c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/GPBEmpty.php b/php/src/GPBMetadata/Google/Protobuf/GPBEmpty.php
new file mode 100644
index 00000000..88f42a11
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/GPBEmpty.php
@@ -0,0 +1,30 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/empty.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class GPBEmpty
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0ab7010a1b676f6f676c652f70726f746f6275662f656d7074792e70726f" .
+            "746f120f676f6f676c652e70726f746f62756622070a05456d7074794276" .
+            "0a13636f6d2e676f6f676c652e70726f746f627566420a456d7074795072" .
+            "6f746f50015a276769746875622e636f6d2f676f6c616e672f70726f746f" .
+            "6275662f7074797065732f656d707479f80101a20203475042aa021e476f" .
+            "6f676c652e50726f746f6275662e57656c6c4b6e6f776e54797065736206" .
+            "70726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php b/php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php
index 7c5c8df4..e6362f2b 100644
--- a/php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php
+++ b/php/src/GPBMetadata/Google/Protobuf/Internal/Descriptor.php
@@ -46,16 +46,21 @@ class Descriptor
             ->repeated('reserved_name', \Google\Protobuf\Internal\GPBType::STRING, 10)
             ->finalizeToPool();
 
-        $pool->addMessage('google.protobuf.internal.DescriptorProto.ExtensionRange', \Google\Protobuf\Internal\DescriptorProto_ExtensionRange::class)
+        $pool->addMessage('google.protobuf.internal.DescriptorProto.ExtensionRange', \Google\Protobuf\Internal\DescriptorProto\ExtensionRange::class)
             ->optional('start', \Google\Protobuf\Internal\GPBType::INT32, 1)
             ->optional('end', \Google\Protobuf\Internal\GPBType::INT32, 2)
+            ->optional('options', \Google\Protobuf\Internal\GPBType::MESSAGE, 3, 'google.protobuf.internal.ExtensionRangeOptions')
             ->finalizeToPool();
 
-        $pool->addMessage('google.protobuf.internal.DescriptorProto.ReservedRange', \Google\Protobuf\Internal\DescriptorProto_ReservedRange::class)
+        $pool->addMessage('google.protobuf.internal.DescriptorProto.ReservedRange', \Google\Protobuf\Internal\DescriptorProto\ReservedRange::class)
             ->optional('start', \Google\Protobuf\Internal\GPBType::INT32, 1)
             ->optional('end', \Google\Protobuf\Internal\GPBType::INT32, 2)
             ->finalizeToPool();
 
+        $pool->addMessage('google.protobuf.internal.ExtensionRangeOptions', \Google\Protobuf\Internal\ExtensionRangeOptions::class)
+            ->repeated('uninterpreted_option', \Google\Protobuf\Internal\GPBType::MESSAGE, 999, 'google.protobuf.internal.UninterpretedOption')
+            ->finalizeToPool();
+
         $pool->addMessage('google.protobuf.internal.FieldDescriptorProto', \Google\Protobuf\Internal\FieldDescriptorProto::class)
             ->optional('name', \Google\Protobuf\Internal\GPBType::STRING, 1)
             ->optional('number', \Google\Protobuf\Internal\GPBType::INT32, 3)
@@ -105,6 +110,13 @@ class Descriptor
             ->optional('name', \Google\Protobuf\Internal\GPBType::STRING, 1)
             ->repeated('value', \Google\Protobuf\Internal\GPBType::MESSAGE, 2, 'google.protobuf.internal.EnumValueDescriptorProto')
             ->optional('options', \Google\Protobuf\Internal\GPBType::MESSAGE, 3, 'google.protobuf.internal.EnumOptions')
+            ->repeated('reserved_range', \Google\Protobuf\Internal\GPBType::MESSAGE, 4, 'google.protobuf.internal.EnumDescriptorProto.EnumReservedRange')
+            ->repeated('reserved_name', \Google\Protobuf\Internal\GPBType::STRING, 5)
+            ->finalizeToPool();
+
+        $pool->addMessage('google.protobuf.internal.EnumDescriptorProto.EnumReservedRange', \Google\Protobuf\Internal\EnumDescriptorProto\EnumReservedRange::class)
+            ->optional('start', \Google\Protobuf\Internal\GPBType::INT32, 1)
+            ->optional('end', \Google\Protobuf\Internal\GPBType::INT32, 2)
             ->finalizeToPool();
 
         $pool->addMessage('google.protobuf.internal.EnumValueDescriptorProto', \Google\Protobuf\Internal\EnumValueDescriptorProto::class)
@@ -139,11 +151,16 @@ class Descriptor
             ->optional('cc_generic_services', \Google\Protobuf\Internal\GPBType::BOOL, 16)
             ->optional('java_generic_services', \Google\Protobuf\Internal\GPBType::BOOL, 17)
             ->optional('py_generic_services', \Google\Protobuf\Internal\GPBType::BOOL, 18)
+            ->optional('php_generic_services', \Google\Protobuf\Internal\GPBType::BOOL, 42)
             ->optional('deprecated', \Google\Protobuf\Internal\GPBType::BOOL, 23)
             ->optional('cc_enable_arenas', \Google\Protobuf\Internal\GPBType::BOOL, 31)
             ->optional('objc_class_prefix', \Google\Protobuf\Internal\GPBType::STRING, 36)
             ->optional('csharp_namespace', \Google\Protobuf\Internal\GPBType::STRING, 37)
             ->optional('swift_prefix', \Google\Protobuf\Internal\GPBType::STRING, 39)
+            ->optional('php_class_prefix', \Google\Protobuf\Internal\GPBType::STRING, 40)
+            ->optional('php_namespace', \Google\Protobuf\Internal\GPBType::STRING, 41)
+            ->optional('php_metadata_namespace', \Google\Protobuf\Internal\GPBType::STRING, 44)
+            ->optional('ruby_package', \Google\Protobuf\Internal\GPBType::STRING, 45)
             ->repeated('uninterpreted_option', \Google\Protobuf\Internal\GPBType::MESSAGE, 999, 'google.protobuf.internal.UninterpretedOption')
             ->finalizeToPool();
 
@@ -225,7 +242,7 @@ class Descriptor
             ->optional('aggregate_value', \Google\Protobuf\Internal\GPBType::STRING, 8)
             ->finalizeToPool();
 
-        $pool->addMessage('google.protobuf.internal.UninterpretedOption.NamePart', \Google\Protobuf\Internal\UninterpretedOption_NamePart::class)
+        $pool->addMessage('google.protobuf.internal.UninterpretedOption.NamePart', \Google\Protobuf\Internal\UninterpretedOption\NamePart::class)
             ->required('name_part', \Google\Protobuf\Internal\GPBType::STRING, 1)
             ->required('is_extension', \Google\Protobuf\Internal\GPBType::BOOL, 2)
             ->finalizeToPool();
@@ -234,7 +251,7 @@ class Descriptor
             ->repeated('location', \Google\Protobuf\Internal\GPBType::MESSAGE, 1, 'google.protobuf.internal.SourceCodeInfo.Location')
             ->finalizeToPool();
 
-        $pool->addMessage('google.protobuf.internal.SourceCodeInfo.Location', \Google\Protobuf\Internal\SourceCodeInfo_Location::class)
+        $pool->addMessage('google.protobuf.internal.SourceCodeInfo.Location', \Google\Protobuf\Internal\SourceCodeInfo\Location::class)
             ->repeated('path', \Google\Protobuf\Internal\GPBType::INT32, 1)
             ->repeated('span', \Google\Protobuf\Internal\GPBType::INT32, 2)
             ->optional('leading_comments', \Google\Protobuf\Internal\GPBType::STRING, 3)
@@ -246,7 +263,7 @@ class Descriptor
             ->repeated('annotation', \Google\Protobuf\Internal\GPBType::MESSAGE, 1, 'google.protobuf.internal.GeneratedCodeInfo.Annotation')
             ->finalizeToPool();
 
-        $pool->addMessage('google.protobuf.internal.GeneratedCodeInfo.Annotation', \Google\Protobuf\Internal\GeneratedCodeInfo_Annotation::class)
+        $pool->addMessage('google.protobuf.internal.GeneratedCodeInfo.Annotation', \Google\Protobuf\Internal\GeneratedCodeInfo\Annotation::class)
             ->repeated('path', \Google\Protobuf\Internal\GPBType::INT32, 1)
             ->optional('source_file', \Google\Protobuf\Internal\GPBType::STRING, 2)
             ->optional('begin', \Google\Protobuf\Internal\GPBType::INT32, 3)
diff --git a/php/src/GPBMetadata/Google/Protobuf/SourceContext.php b/php/src/GPBMetadata/Google/Protobuf/SourceContext.php
new file mode 100644
index 00000000..495c6de4
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/SourceContext.php
@@ -0,0 +1,32 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/source_context.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class SourceContext
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0afb010a24676f6f676c652f70726f746f6275662f736f757263655f636f" .
+            "6e746578742e70726f746f120f676f6f676c652e70726f746f6275662222" .
+            "0a0d536f75726365436f6e7465787412110a0966696c655f6e616d651801" .
+            "200128094295010a13636f6d2e676f6f676c652e70726f746f6275664212" .
+            "536f75726365436f6e7465787450726f746f50015a41676f6f676c652e67" .
+            "6f6c616e672e6f72672f67656e70726f746f2f70726f746f6275662f736f" .
+            "757263655f636f6e746578743b736f757263655f636f6e74657874a20203" .
+            "475042aa021e476f6f676c652e50726f746f6275662e57656c6c4b6e6f77" .
+            "6e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Struct.php b/php/src/GPBMetadata/Google/Protobuf/Struct.php
new file mode 100644
index 00000000..96b42af4
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Struct.php
@@ -0,0 +1,45 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Struct
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0a81050a1c676f6f676c652f70726f746f6275662f7374727563742e7072" .
+            "6f746f120f676f6f676c652e70726f746f6275662284010a065374727563" .
+            "7412330a066669656c647318012003280b32232e676f6f676c652e70726f" .
+            "746f6275662e5374727563742e4669656c6473456e7472791a450a0b4669" .
+            "656c6473456e747279120b0a036b657918012001280912250a0576616c75" .
+            "6518022001280b32162e676f6f676c652e70726f746f6275662e56616c75" .
+            "653a02380122ea010a0556616c756512300a0a6e756c6c5f76616c756518" .
+            "012001280e321a2e676f6f676c652e70726f746f6275662e4e756c6c5661" .
+            "6c7565480012160a0c6e756d6265725f76616c7565180220012801480012" .
+            "160a0c737472696e675f76616c7565180320012809480012140a0a626f6f" .
+            "6c5f76616c75651804200128084800122f0a0c7374727563745f76616c75" .
+            "6518052001280b32172e676f6f676c652e70726f746f6275662e53747275" .
+            "6374480012300a0a6c6973745f76616c756518062001280b321a2e676f6f" .
+            "676c652e70726f746f6275662e4c69737456616c7565480042060a046b69" .
+            "6e6422330a094c69737456616c756512260a0676616c7565731801200328" .
+            "0b32162e676f6f676c652e70726f746f6275662e56616c75652a1b0a094e" .
+            "756c6c56616c7565120e0a0a4e554c4c5f56414c554510004281010a1363" .
+            "6f6d2e676f6f676c652e70726f746f627566420b53747275637450726f74" .
+            "6f50015a316769746875622e636f6d2f676f6c616e672f70726f746f6275" .
+            "662f7074797065732f7374727563743b7374727563747062f80101a20203" .
+            "475042aa021e476f6f676c652e50726f746f6275662e57656c6c4b6e6f77" .
+            "6e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Timestamp.php b/php/src/GPBMetadata/Google/Protobuf/Timestamp.php
new file mode 100644
index 00000000..373665c9
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Timestamp.php
@@ -0,0 +1,31 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/timestamp.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Timestamp
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0ae7010a1f676f6f676c652f70726f746f6275662f74696d657374616d70" .
+            "2e70726f746f120f676f6f676c652e70726f746f627566222b0a0954696d" .
+            "657374616d70120f0a077365636f6e6473180120012803120d0a056e616e" .
+            "6f73180220012805427e0a13636f6d2e676f6f676c652e70726f746f6275" .
+            "66420e54696d657374616d7050726f746f50015a2b6769746875622e636f" .
+            "6d2f676f6c616e672f70726f746f6275662f7074797065732f74696d6573" .
+            "74616d70f80101a20203475042aa021e476f6f676c652e50726f746f6275" .
+            "662e57656c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Type.php b/php/src/GPBMetadata/Google/Protobuf/Type.php
new file mode 100644
index 00000000..8fbe8cbf
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Type.php
@@ -0,0 +1,78 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Type
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        \GPBMetadata\Google\Protobuf\Any::initOnce();
+        \GPBMetadata\Google\Protobuf\SourceContext::initOnce();
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0a9f0c0a1a676f6f676c652f70726f746f6275662f747970652e70726f74" .
+            "6f120f676f6f676c652e70726f746f6275661a24676f6f676c652f70726f" .
+            "746f6275662f736f757263655f636f6e746578742e70726f746f22d7010a" .
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+            "120f0a0b545950455f55494e543332100d120d0a09545950455f454e554d" .
+            "100e12110a0d545950455f5346495845443332100f12110a0d545950455f" .
+            "53464958454436341010120f0a0b545950455f53494e5433321011120f0a" .
+            "0b545950455f53494e543634101222740a0b43617264696e616c69747912" .
+            "170a1343415244494e414c4954595f554e4b4e4f574e100012180a144341" .
+            "5244494e414c4954595f4f5054494f4e414c100112180a1443415244494e" .
+            "414c4954595f5245515549524544100212180a1443415244494e414c4954" .
+            "595f5245504541544544100322ce010a04456e756d120c0a046e616d6518" .
+            "0120012809122d0a09656e756d76616c756518022003280b321a2e676f6f" .
+            "676c652e70726f746f6275662e456e756d56616c756512280a076f707469" .
+            "6f6e7318032003280b32172e676f6f676c652e70726f746f6275662e4f70" .
+            "74696f6e12360a0e736f757263655f636f6e7465787418042001280b321e" .
+            "2e676f6f676c652e70726f746f6275662e536f75726365436f6e74657874" .
+            "12270a0673796e74617818052001280e32172e676f6f676c652e70726f74" .
+            "6f6275662e53796e74617822530a09456e756d56616c7565120c0a046e61" .
+            "6d65180120012809120e0a066e756d62657218022001280512280a076f70" .
+            "74696f6e7318032003280b32172e676f6f676c652e70726f746f6275662e" .
+            "4f7074696f6e223b0a064f7074696f6e120c0a046e616d65180120012809" .
+            "12230a0576616c756518022001280b32142e676f6f676c652e70726f746f" .
+            "6275662e416e792a2e0a0653796e74617812110a0d53594e5441585f5052" .
+            "4f544f32100012110a0d53594e5441585f50524f544f331001427d0a1363" .
+            "6f6d2e676f6f676c652e70726f746f62756642095479706550726f746f50" .
+            "015a2f676f6f676c652e676f6c616e672e6f72672f67656e70726f746f2f" .
+            "70726f746f6275662f70747970653b7074797065f80101a20203475042aa" .
+            "021e476f6f676c652e50726f746f6275662e57656c6c4b6e6f776e547970" .
+            "6573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/GPBMetadata/Google/Protobuf/Wrappers.php b/php/src/GPBMetadata/Google/Protobuf/Wrappers.php
new file mode 100644
index 00000000..dd72ff48
--- /dev/null
+++ b/php/src/GPBMetadata/Google/Protobuf/Wrappers.php
@@ -0,0 +1,38 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace GPBMetadata\Google\Protobuf;
+
+class Wrappers
+{
+    public static $is_initialized = false;
+
+    public static function initOnce() {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+
+        if (static::$is_initialized == true) {
+          return;
+        }
+        $pool->internalAddGeneratedFile(hex2bin(
+            "0abf030a1e676f6f676c652f70726f746f6275662f77726170706572732e" .
+            "70726f746f120f676f6f676c652e70726f746f627566221c0a0b446f7562" .
+            "6c6556616c7565120d0a0576616c7565180120012801221b0a0a466c6f61" .
+            "7456616c7565120d0a0576616c7565180120012802221b0a0a496e743634" .
+            "56616c7565120d0a0576616c7565180120012803221c0a0b55496e743634" .
+            "56616c7565120d0a0576616c7565180120012804221b0a0a496e74333256" .
+            "616c7565120d0a0576616c7565180120012805221c0a0b55496e74333256" .
+            "616c7565120d0a0576616c756518012001280d221a0a09426f6f6c56616c" .
+            "7565120d0a0576616c7565180120012808221c0a0b537472696e6756616c" .
+            "7565120d0a0576616c7565180120012809221b0a0a427974657356616c75" .
+            "65120d0a0576616c756518012001280c427c0a13636f6d2e676f6f676c65" .
+            "2e70726f746f627566420d577261707065727350726f746f50015a2a6769" .
+            "746875622e636f6d2f676f6c616e672f70726f746f6275662f7074797065" .
+            "732f7772617070657273f80101a20203475042aa021e476f6f676c652e50" .
+            "726f746f6275662e57656c6c4b6e6f776e5479706573620670726f746f33"
+        ));
+
+        static::$is_initialized = true;
+    }
+}
+
diff --git a/php/src/Google/Protobuf/Any.php b/php/src/Google/Protobuf/Any.php
new file mode 100644
index 00000000..a9928549
--- /dev/null
+++ b/php/src/Google/Protobuf/Any.php
@@ -0,0 +1,325 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/any.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\Message;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `Any` contains an arbitrary serialized protocol buffer message along with a
+ * URL that describes the type of the serialized message.
+ * Protobuf library provides support to pack/unpack Any values in the form
+ * of utility functions or additional generated methods of the Any type.
+ * Example 1: Pack and unpack a message in C++.
+ *     Foo foo = ...;
+ *     Any any;
+ *     any.PackFrom(foo);
+ *     ...
+ *     if (any.UnpackTo(&foo)) {
+ *       ...
+ *     }
+ * Example 2: Pack and unpack a message in Java.
+ *     Foo foo = ...;
+ *     Any any = Any.pack(foo);
+ *     ...
+ *     if (any.is(Foo.class)) {
+ *       foo = any.unpack(Foo.class);
+ *     }
+ *  Example 3: Pack and unpack a message in Python.
+ *     foo = Foo(...)
+ *     any = Any()
+ *     any.Pack(foo)
+ *     ...
+ *     if any.Is(Foo.DESCRIPTOR):
+ *       any.Unpack(foo)
+ *       ...
+ *  Example 4: Pack and unpack a message in Go
+ *      foo := &pb.Foo{...}
+ *      any, err := ptypes.MarshalAny(foo)
+ *      ...
+ *      foo := &pb.Foo{}
+ *      if err := ptypes.UnmarshalAny(any, foo); err != nil {
+ *        ...
+ *      }
+ * The pack methods provided by protobuf library will by default use
+ * 'type.googleapis.com/full.type.name' as the type URL and the unpack
+ * methods only use the fully qualified type name after the last '/'
+ * in the type URL, for example "foo.bar.com/x/y.z" will yield type
+ * name "y.z".
+ * JSON
+ * ====
+ * The JSON representation of an `Any` value uses the regular
+ * representation of the deserialized, embedded message, with an
+ * additional field `&#64;type` which contains the type URL. Example:
+ *     package google.profile;
+ *     message Person {
+ *       string first_name = 1;
+ *       string last_name = 2;
+ *     }
+ *     {
+ *       "&#64;type": "type.googleapis.com/google.profile.Person",
+ *       "firstName": <string>,
+ *       "lastName": <string>
+ *     }
+ * If the embedded message type is well-known and has a custom JSON
+ * representation, that representation will be embedded adding a field
+ * `value` which holds the custom JSON in addition to the `&#64;type`
+ * field. Example (for message [google.protobuf.Duration][]):
+ *     {
+ *       "&#64;type": "type.googleapis.com/google.protobuf.Duration",
+ *       "value": "1.212s"
+ *     }
+ *
+ * Generated from protobuf message <code>google.protobuf.Any</code>
+ */
+class Any extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * A URL/resource name that uniquely identifies the type of the serialized
+     * protocol buffer message. The last segment of the URL's path must represent
+     * the fully qualified name of the type (as in
+     * `path/google.protobuf.Duration`). The name should be in a canonical form
+     * (e.g., leading "." is not accepted).
+     * In practice, teams usually precompile into the binary all types that they
+     * expect it to use in the context of Any. However, for URLs which use the
+     * scheme `http`, `https`, or no scheme, one can optionally set up a type
+     * server that maps type URLs to message definitions as follows:
+     * * If no scheme is provided, `https` is assumed.
+     * * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+     *   value in binary format, or produce an error.
+     * * Applications are allowed to cache lookup results based on the
+     *   URL, or have them precompiled into a binary to avoid any
+     *   lookup. Therefore, binary compatibility needs to be preserved
+     *   on changes to types. (Use versioned type names to manage
+     *   breaking changes.)
+     * Note: this functionality is not currently available in the official
+     * protobuf release, and it is not used for type URLs beginning with
+     * type.googleapis.com.
+     * Schemes other than `http`, `https` (or the empty scheme) might be
+     * used with implementation specific semantics.
+     *
+     * Generated from protobuf field <code>string type_url = 1;</code>
+     */
+    private $type_url = '';
+    /**
+     * Must be a valid serialized protocol buffer of the above specified type.
+     *
+     * Generated from protobuf field <code>bytes value = 2;</code>
+     */
+    private $value = '';
+
+    const TYPE_URL_PREFIX = 'type.googleapis.com/';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $type_url
+     *           A URL/resource name that uniquely identifies the type of the serialized
+     *           protocol buffer message. The last segment of the URL's path must represent
+     *           the fully qualified name of the type (as in
+     *           `path/google.protobuf.Duration`). The name should be in a canonical form
+     *           (e.g., leading "." is not accepted).
+     *           In practice, teams usually precompile into the binary all types that they
+     *           expect it to use in the context of Any. However, for URLs which use the
+     *           scheme `http`, `https`, or no scheme, one can optionally set up a type
+     *           server that maps type URLs to message definitions as follows:
+     *           * If no scheme is provided, `https` is assumed.
+     *           * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+     *             value in binary format, or produce an error.
+     *           * Applications are allowed to cache lookup results based on the
+     *             URL, or have them precompiled into a binary to avoid any
+     *             lookup. Therefore, binary compatibility needs to be preserved
+     *             on changes to types. (Use versioned type names to manage
+     *             breaking changes.)
+     *           Note: this functionality is not currently available in the official
+     *           protobuf release, and it is not used for type URLs beginning with
+     *           type.googleapis.com.
+     *           Schemes other than `http`, `https` (or the empty scheme) might be
+     *           used with implementation specific semantics.
+     *     @type string $value
+     *           Must be a valid serialized protocol buffer of the above specified type.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Any::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * A URL/resource name that uniquely identifies the type of the serialized
+     * protocol buffer message. The last segment of the URL's path must represent
+     * the fully qualified name of the type (as in
+     * `path/google.protobuf.Duration`). The name should be in a canonical form
+     * (e.g., leading "." is not accepted).
+     * In practice, teams usually precompile into the binary all types that they
+     * expect it to use in the context of Any. However, for URLs which use the
+     * scheme `http`, `https`, or no scheme, one can optionally set up a type
+     * server that maps type URLs to message definitions as follows:
+     * * If no scheme is provided, `https` is assumed.
+     * * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+     *   value in binary format, or produce an error.
+     * * Applications are allowed to cache lookup results based on the
+     *   URL, or have them precompiled into a binary to avoid any
+     *   lookup. Therefore, binary compatibility needs to be preserved
+     *   on changes to types. (Use versioned type names to manage
+     *   breaking changes.)
+     * Note: this functionality is not currently available in the official
+     * protobuf release, and it is not used for type URLs beginning with
+     * type.googleapis.com.
+     * Schemes other than `http`, `https` (or the empty scheme) might be
+     * used with implementation specific semantics.
+     *
+     * Generated from protobuf field <code>string type_url = 1;</code>
+     * @return string
+     */
+    public function getTypeUrl()
+    {
+        return $this->type_url;
+    }
+
+    /**
+     * A URL/resource name that uniquely identifies the type of the serialized
+     * protocol buffer message. The last segment of the URL's path must represent
+     * the fully qualified name of the type (as in
+     * `path/google.protobuf.Duration`). The name should be in a canonical form
+     * (e.g., leading "." is not accepted).
+     * In practice, teams usually precompile into the binary all types that they
+     * expect it to use in the context of Any. However, for URLs which use the
+     * scheme `http`, `https`, or no scheme, one can optionally set up a type
+     * server that maps type URLs to message definitions as follows:
+     * * If no scheme is provided, `https` is assumed.
+     * * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+     *   value in binary format, or produce an error.
+     * * Applications are allowed to cache lookup results based on the
+     *   URL, or have them precompiled into a binary to avoid any
+     *   lookup. Therefore, binary compatibility needs to be preserved
+     *   on changes to types. (Use versioned type names to manage
+     *   breaking changes.)
+     * Note: this functionality is not currently available in the official
+     * protobuf release, and it is not used for type URLs beginning with
+     * type.googleapis.com.
+     * Schemes other than `http`, `https` (or the empty scheme) might be
+     * used with implementation specific semantics.
+     *
+     * Generated from protobuf field <code>string type_url = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setTypeUrl($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->type_url = $var;
+
+        return $this;
+    }
+
+    /**
+     * Must be a valid serialized protocol buffer of the above specified type.
+     *
+     * Generated from protobuf field <code>bytes value = 2;</code>
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Must be a valid serialized protocol buffer of the above specified type.
+     *
+     * Generated from protobuf field <code>bytes value = 2;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkString($var, False);
+        $this->value = $var;
+
+        return $this;
+    }
+
+    /**
+     * This method will try to resolve the type_url in Any message to get the
+     * targeted message type. If failed, an error will be thrown. Otherwise,
+     * the method will create a message of the targeted type and fill it with
+     * the decoded value in Any.
+     * @return unpacked message
+     * @throws Exception Type url needs to be type.googleapis.com/fully-qulified.
+     * @throws Exception Class hasn't been added to descriptor pool.
+     * @throws Exception cannot decode data in value field.
+     */
+    public function unpack()
+    {
+        // Get fully qualifed name from type url.
+        $url_prifix_len = strlen(GPBUtil::TYPE_URL_PREFIX);
+        if (substr($this->type_url, 0, $url_prifix_len) !=
+                GPBUtil::TYPE_URL_PREFIX) {
+            throw new \Exception(
+                "Type url needs to be type.googleapis.com/fully-qulified");
+        }
+        $fully_qualifed_name =
+            substr($this->type_url, $url_prifix_len);
+
+        // Create message according to fully qualified name.
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByProtoName( ".".$fully_qualifed_name);
+        if (is_null($desc)) {
+            throw new \Exception("Class ".$fully_qualifed_name
+                                     ." hasn't been added to descriptor pool");
+        }
+        $klass = $desc->getClass();
+        $msg = new $klass();
+
+        // Merge data into message.
+        $msg->mergeFromString($this->value);
+        return $msg;
+    }
+
+    /**
+     * The type_url will be created according to the given message’s type and
+     * the value is encoded data from the given message..
+     * @param message: A proto message.
+     */
+    public function pack($msg)
+    {
+        if (!$msg instanceof Message) {
+            trigger_error("Given parameter is not a message instance.",
+                          E_USER_ERROR);
+            return;
+        }
+
+        // Set value using serialzed message.
+        $this->value = $msg->serializeToString();
+
+        // Set type url.
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName(get_class($msg));
+        $fully_qualifed_name = $desc->getFullName();
+        $this->type_url = GPBUtil::TYPE_URL_PREFIX.substr(
+            $fully_qualifed_name, 1, strlen($fully_qualifed_name));
+    }
+
+    /**
+     * This method returns whether the type_url in any_message is corresponded
+     * to the given class.
+     * @param klass: The fully qualified PHP class name of a proto message type.
+     */
+    public function is($klass)
+    {
+        $pool = \Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName($klass);
+        $fully_qualifed_name = $desc->getFullName();
+        $type_url = GPBUtil::TYPE_URL_PREFIX.substr(
+            $fully_qualifed_name, 1, strlen($fully_qualifed_name));
+        return $this->type_url === $type_url;
+    }
+}
+
diff --git a/php/src/Google/Protobuf/Api.php b/php/src/Google/Protobuf/Api.php
new file mode 100644
index 00000000..db37ffb0
--- /dev/null
+++ b/php/src/Google/Protobuf/Api.php
@@ -0,0 +1,350 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/api.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Api is a light-weight descriptor for an API Interface.
+ * Interfaces are also described as "protocol buffer services" in some contexts,
+ * such as by the "service" keyword in a .proto file, but they are different
+ * from API Services, which represent a concrete implementation of an interface
+ * as opposed to simply a description of methods and bindings. They are also
+ * sometimes simply referred to as "APIs" in other contexts, such as the name of
+ * this message itself. See https://cloud.google.com/apis/design/glossary for
+ * detailed terminology.
+ *
+ * Generated from protobuf message <code>google.protobuf.Api</code>
+ */
+class Api extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The fully qualified name of this interface, including package name
+     * followed by the interface's simple name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * The methods of this interface, in unspecified order.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Method methods = 2;</code>
+     */
+    private $methods;
+    /**
+     * Any metadata attached to the interface.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     */
+    private $options;
+    /**
+     * A version string for this interface. If specified, must have the form
+     * `major-version.minor-version`, as in `1.10`. If the minor version is
+     * omitted, it defaults to zero. If the entire version field is empty, the
+     * major version is derived from the package name, as outlined below. If the
+     * field is not empty, the version in the package name will be verified to be
+     * consistent with what is provided here.
+     * The versioning schema uses [semantic
+     * versioning](http://semver.org) where the major version number
+     * indicates a breaking change and the minor version an additive,
+     * non-breaking change. Both version numbers are signals to users
+     * what to expect from different versions, and should be carefully
+     * chosen based on the product plan.
+     * The major version is also reflected in the package name of the
+     * interface, which must end in `v<major-version>`, as in
+     * `google.feature.v1`. For major versions 0 and 1, the suffix can
+     * be omitted. Zero major versions must only be used for
+     * experimental, non-GA interfaces.
+     *
+     * Generated from protobuf field <code>string version = 4;</code>
+     */
+    private $version = '';
+    /**
+     * Source context for the protocol buffer service represented by this
+     * message.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     */
+    private $source_context = null;
+    /**
+     * Included interfaces. See [Mixin][].
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Mixin mixins = 6;</code>
+     */
+    private $mixins;
+    /**
+     * The source syntax of the service.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     */
+    private $syntax = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           The fully qualified name of this interface, including package name
+     *           followed by the interface's simple name.
+     *     @type \Google\Protobuf\Method[]|\Google\Protobuf\Internal\RepeatedField $methods
+     *           The methods of this interface, in unspecified order.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           Any metadata attached to the interface.
+     *     @type string $version
+     *           A version string for this interface. If specified, must have the form
+     *           `major-version.minor-version`, as in `1.10`. If the minor version is
+     *           omitted, it defaults to zero. If the entire version field is empty, the
+     *           major version is derived from the package name, as outlined below. If the
+     *           field is not empty, the version in the package name will be verified to be
+     *           consistent with what is provided here.
+     *           The versioning schema uses [semantic
+     *           versioning](http://semver.org) where the major version number
+     *           indicates a breaking change and the minor version an additive,
+     *           non-breaking change. Both version numbers are signals to users
+     *           what to expect from different versions, and should be carefully
+     *           chosen based on the product plan.
+     *           The major version is also reflected in the package name of the
+     *           interface, which must end in `v<major-version>`, as in
+     *           `google.feature.v1`. For major versions 0 and 1, the suffix can
+     *           be omitted. Zero major versions must only be used for
+     *           experimental, non-GA interfaces.
+     *     @type \Google\Protobuf\SourceContext $source_context
+     *           Source context for the protocol buffer service represented by this
+     *           message.
+     *     @type \Google\Protobuf\Mixin[]|\Google\Protobuf\Internal\RepeatedField $mixins
+     *           Included interfaces. See [Mixin][].
+     *     @type int $syntax
+     *           The source syntax of the service.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Api::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The fully qualified name of this interface, including package name
+     * followed by the interface's simple name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The fully qualified name of this interface, including package name
+     * followed by the interface's simple name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * The methods of this interface, in unspecified order.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Method methods = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getMethods()
+    {
+        return $this->methods;
+    }
+
+    /**
+     * The methods of this interface, in unspecified order.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Method methods = 2;</code>
+     * @param \Google\Protobuf\Method[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setMethods($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Method::class);
+        $this->methods = $arr;
+
+        return $this;
+    }
+
+    /**
+     * Any metadata attached to the interface.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * Any metadata attached to the interface.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+    /**
+     * A version string for this interface. If specified, must have the form
+     * `major-version.minor-version`, as in `1.10`. If the minor version is
+     * omitted, it defaults to zero. If the entire version field is empty, the
+     * major version is derived from the package name, as outlined below. If the
+     * field is not empty, the version in the package name will be verified to be
+     * consistent with what is provided here.
+     * The versioning schema uses [semantic
+     * versioning](http://semver.org) where the major version number
+     * indicates a breaking change and the minor version an additive,
+     * non-breaking change. Both version numbers are signals to users
+     * what to expect from different versions, and should be carefully
+     * chosen based on the product plan.
+     * The major version is also reflected in the package name of the
+     * interface, which must end in `v<major-version>`, as in
+     * `google.feature.v1`. For major versions 0 and 1, the suffix can
+     * be omitted. Zero major versions must only be used for
+     * experimental, non-GA interfaces.
+     *
+     * Generated from protobuf field <code>string version = 4;</code>
+     * @return string
+     */
+    public function getVersion()
+    {
+        return $this->version;
+    }
+
+    /**
+     * A version string for this interface. If specified, must have the form
+     * `major-version.minor-version`, as in `1.10`. If the minor version is
+     * omitted, it defaults to zero. If the entire version field is empty, the
+     * major version is derived from the package name, as outlined below. If the
+     * field is not empty, the version in the package name will be verified to be
+     * consistent with what is provided here.
+     * The versioning schema uses [semantic
+     * versioning](http://semver.org) where the major version number
+     * indicates a breaking change and the minor version an additive,
+     * non-breaking change. Both version numbers are signals to users
+     * what to expect from different versions, and should be carefully
+     * chosen based on the product plan.
+     * The major version is also reflected in the package name of the
+     * interface, which must end in `v<major-version>`, as in
+     * `google.feature.v1`. For major versions 0 and 1, the suffix can
+     * be omitted. Zero major versions must only be used for
+     * experimental, non-GA interfaces.
+     *
+     * Generated from protobuf field <code>string version = 4;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setVersion($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->version = $var;
+
+        return $this;
+    }
+
+    /**
+     * Source context for the protocol buffer service represented by this
+     * message.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     * @return \Google\Protobuf\SourceContext
+     */
+    public function getSourceContext()
+    {
+        return $this->source_context;
+    }
+
+    /**
+     * Source context for the protocol buffer service represented by this
+     * message.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     * @param \Google\Protobuf\SourceContext $var
+     * @return $this
+     */
+    public function setSourceContext($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\SourceContext::class);
+        $this->source_context = $var;
+
+        return $this;
+    }
+
+    /**
+     * Included interfaces. See [Mixin][].
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Mixin mixins = 6;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getMixins()
+    {
+        return $this->mixins;
+    }
+
+    /**
+     * Included interfaces. See [Mixin][].
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Mixin mixins = 6;</code>
+     * @param \Google\Protobuf\Mixin[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setMixins($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Mixin::class);
+        $this->mixins = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The source syntax of the service.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     * @return int
+     */
+    public function getSyntax()
+    {
+        return $this->syntax;
+    }
+
+    /**
+     * The source syntax of the service.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setSyntax($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Syntax::class);
+        $this->syntax = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/BoolValue.php b/php/src/Google/Protobuf/BoolValue.php
new file mode 100644
index 00000000..13872eb1
--- /dev/null
+++ b/php/src/Google/Protobuf/BoolValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `bool`.
+ * The JSON representation for `BoolValue` is JSON `true` and `false`.
+ *
+ * Generated from protobuf message <code>google.protobuf.BoolValue</code>
+ */
+class BoolValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The bool value.
+     *
+     * Generated from protobuf field <code>bool value = 1;</code>
+     */
+    private $value = false;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $value
+     *           The bool value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The bool value.
+     *
+     * Generated from protobuf field <code>bool value = 1;</code>
+     * @return bool
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The bool value.
+     *
+     * Generated from protobuf field <code>bool value = 1;</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/BytesValue.php b/php/src/Google/Protobuf/BytesValue.php
new file mode 100644
index 00000000..f1b38171
--- /dev/null
+++ b/php/src/Google/Protobuf/BytesValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `bytes`.
+ * The JSON representation for `BytesValue` is JSON string.
+ *
+ * Generated from protobuf message <code>google.protobuf.BytesValue</code>
+ */
+class BytesValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The bytes value.
+     *
+     * Generated from protobuf field <code>bytes value = 1;</code>
+     */
+    private $value = '';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $value
+     *           The bytes value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The bytes value.
+     *
+     * Generated from protobuf field <code>bytes value = 1;</code>
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The bytes value.
+     *
+     * Generated from protobuf field <code>bytes value = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkString($var, False);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java b/php/src/Google/Protobuf/Descriptor.php
index b1678d1b..986b81e1 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
+++ b/php/src/Google/Protobuf/Descriptor.php
@@ -1,5 +1,7 @@
+<?php
+
 // Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
+// Copyright 2017 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -28,61 +30,71 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-package com.google.protobuf.nano;
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GetPublicDescriptorTrait;
 
-import java.io.IOException;
-import java.util.Arrays;
+class Descriptor
+{
+    use GetPublicDescriptorTrait;
 
-/**
- * Stores unknown fields. These might be extensions or fields that the generated
- * API doesn't know about yet.
- *
- * @author bduff@google.com (Brian Duff)
- */
-final class UnknownFieldData {
+    private $internal_desc;
 
-    final int tag;
     /**
-     * Important: this should be treated as immutable, even though it's possible
-     * to change the array values.
+     * @internal
      */
-    final byte[] bytes;
+    public function __construct($internal_desc)
+    {
+        $this->internal_desc = $internal_desc;
+    }
 
-    UnknownFieldData(int tag, byte[] bytes) {
-        this.tag = tag;
-        this.bytes = bytes;
+    /**
+     * @return string Full protobuf message name
+     */
+    public function getFullName()
+    {
+        return trim($this->internal_desc->getFullName(), ".");
     }
 
-    int computeSerializedSize() {
-        int size = 0;
-        size += CodedOutputByteBufferNano.computeRawVarint32Size(tag);
-        size += bytes.length;
-        return size;
+    /**
+     * @return string PHP class name
+     */
+    public function getClass()
+    {
+        return $this->internal_desc->getClass();
     }
 
-    void writeTo(CodedOutputByteBufferNano output) throws IOException {
-        output.writeRawVarint32(tag);
-        output.writeRawBytes(bytes);
+    /**
+     * @param int $index Must be >= 0 and < getFieldCount()
+     * @return FieldDescriptor
+     */
+    public function getField($index)
+    {
+        return $this->getPublicDescriptor($this->internal_desc->getFieldByIndex($index));
     }
 
-    @Override
-    public boolean equals(Object o) {
-        if (o == this) {
-            return true;
-        }
-        if (!(o instanceof UnknownFieldData)) {
-            return false;
-        }
+    /**
+     * @return int Number of fields in message
+     */
+    public function getFieldCount()
+    {
+        return count($this->internal_desc->getField());
+    }
 
-        UnknownFieldData other = (UnknownFieldData) o;
-        return tag == other.tag && Arrays.equals(bytes, other.bytes);
+    /**
+     * @param int $index Must be >= 0 and < getOneofDeclCount()
+     * @return OneofDescriptor
+     */
+    public function getOneofDecl($index)
+    {
+        return $this->getPublicDescriptor($this->internal_desc->getOneofDecl()[$index]);
     }
 
-    @Override
-    public int hashCode() {
-        int result = 17;
-        result = 31 * result + tag;
-        result = 31 * result + Arrays.hashCode(bytes);
-        return result;
+    /**
+     * @return int Number of oneofs in message
+     */
+    public function getOneofDeclCount()
+    {
+        return count($this->internal_desc->getOneofDecl());
     }
 }
diff --git a/javanano/src/main/java/com/google/protobuf/nano/MapFactories.java b/php/src/Google/Protobuf/DescriptorPool.php
index 98fa4877..119f0e2e 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/MapFactories.java
+++ b/php/src/Google/Protobuf/DescriptorPool.php
@@ -1,5 +1,7 @@
+<?php
+
 // Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
+// Copyright 2017 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -28,40 +30,47 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-package com.google.protobuf.nano;
+namespace Google\Protobuf;
 
-import java.util.HashMap;
-import java.util.Map;
+class DescriptorPool
+{
+    private static $pool;
 
-/**
- * Utility class for maps support.
- */
-public final class MapFactories {
-  public static interface MapFactory {
-    <K, V> Map<K, V> forMap(Map<K, V> oldMap);
-  }
+    private $internal_pool;
 
-  // NOTE(liujisi): The factory setter is temporarily marked as package private.
-  // The way to provide customized implementations of maps for different
-  // platforms are still under discussion.  Mark it as private to avoid exposing
-  // the API in proto3 alpha release.
-  /* public */ static void setMapFactory(MapFactory newMapFactory) {
-    mapFactory = newMapFactory;
-  }
+    /**
+     * @return DescriptorPool
+     */
+    public static function getGeneratedPool()
+    {
+        if (!isset(self::$pool)) {
+            self::$pool = new DescriptorPool(\Google\Protobuf\Internal\DescriptorPool::getGeneratedPool());
+        }
+        return self::$pool;
+    }
 
-  public static MapFactory getMapFactory() {
-    return mapFactory;
-  }
+    private function __construct($internal_pool)
+    {
+        $this->internal_pool = $internal_pool;
+    }
 
-  private static class DefaultMapFactory implements MapFactory {
-    public <K, V> Map<K, V> forMap(Map<K, V> oldMap) {
-      if (oldMap == null) {
-        return new HashMap<K, V>();
-      }
-      return oldMap;
+    /**
+     * @param string $className A fully qualified protobuf class name
+     * @return Descriptor
+     */
+    public function getDescriptorByClassName($className)
+    {
+        $desc = $this->internal_pool->getDescriptorByClassName($className);
+        return is_null($desc) ? null : $desc->getPublicDescriptor();
     }
-  }
-  private static volatile MapFactory mapFactory = new DefaultMapFactory();
 
-  private MapFactories() {}
+    /**
+     * @param string $className A fully qualified protobuf class name
+     * @return EnumDescriptor
+     */
+    public function getEnumDescriptorByClassName($className)
+    {
+        $desc = $this->internal_pool->getEnumDescriptorByClassName($className);
+        return is_null($desc) ? null : $desc->getPublicDescriptor();
+    }
 }
diff --git a/php/src/Google/Protobuf/DoubleValue.php b/php/src/Google/Protobuf/DoubleValue.php
new file mode 100644
index 00000000..236d9182
--- /dev/null
+++ b/php/src/Google/Protobuf/DoubleValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `double`.
+ * The JSON representation for `DoubleValue` is JSON number.
+ *
+ * Generated from protobuf message <code>google.protobuf.DoubleValue</code>
+ */
+class DoubleValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The double value.
+     *
+     * Generated from protobuf field <code>double value = 1;</code>
+     */
+    private $value = 0.0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type float $value
+     *           The double value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The double value.
+     *
+     * Generated from protobuf field <code>double value = 1;</code>
+     * @return float
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The double value.
+     *
+     * Generated from protobuf field <code>double value = 1;</code>
+     * @param float $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkDouble($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Duration.php b/php/src/Google/Protobuf/Duration.php
new file mode 100644
index 00000000..414a1868
--- /dev/null
+++ b/php/src/Google/Protobuf/Duration.php
@@ -0,0 +1,173 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/duration.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A Duration represents a signed, fixed-length span of time represented
+ * as a count of seconds and fractions of seconds at nanosecond
+ * resolution. It is independent of any calendar and concepts like "day"
+ * or "month". It is related to Timestamp in that the difference between
+ * two Timestamp values is a Duration and it can be added or subtracted
+ * from a Timestamp. Range is approximately +-10,000 years.
+ * # Examples
+ * Example 1: Compute Duration from two Timestamps in pseudo code.
+ *     Timestamp start = ...;
+ *     Timestamp end = ...;
+ *     Duration duration = ...;
+ *     duration.seconds = end.seconds - start.seconds;
+ *     duration.nanos = end.nanos - start.nanos;
+ *     if (duration.seconds < 0 && duration.nanos > 0) {
+ *       duration.seconds += 1;
+ *       duration.nanos -= 1000000000;
+ *     } else if (durations.seconds > 0 && duration.nanos < 0) {
+ *       duration.seconds -= 1;
+ *       duration.nanos += 1000000000;
+ *     }
+ * Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
+ *     Timestamp start = ...;
+ *     Duration duration = ...;
+ *     Timestamp end = ...;
+ *     end.seconds = start.seconds + duration.seconds;
+ *     end.nanos = start.nanos + duration.nanos;
+ *     if (end.nanos < 0) {
+ *       end.seconds -= 1;
+ *       end.nanos += 1000000000;
+ *     } else if (end.nanos >= 1000000000) {
+ *       end.seconds += 1;
+ *       end.nanos -= 1000000000;
+ *     }
+ * Example 3: Compute Duration from datetime.timedelta in Python.
+ *     td = datetime.timedelta(days=3, minutes=10)
+ *     duration = Duration()
+ *     duration.FromTimedelta(td)
+ * # JSON Mapping
+ * In JSON format, the Duration type is encoded as a string rather than an
+ * object, where the string ends in the suffix "s" (indicating seconds) and
+ * is preceded by the number of seconds, with nanoseconds expressed as
+ * fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+ * encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+ * be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+ * microsecond should be expressed in JSON format as "3.000001s".
+ *
+ * Generated from protobuf message <code>google.protobuf.Duration</code>
+ */
+class Duration extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Signed seconds of the span of time. Must be from -315,576,000,000
+     * to +315,576,000,000 inclusive. Note: these bounds are computed from:
+     * 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     */
+    private $seconds = 0;
+    /**
+     * Signed fractions of a second at nanosecond resolution of the span
+     * of time. Durations less than one second are represented with a 0
+     * `seconds` field and a positive or negative `nanos` field. For durations
+     * of one second or more, a non-zero value for the `nanos` field must be
+     * of the same sign as the `seconds` field. Must be from -999,999,999
+     * to +999,999,999 inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     */
+    private $nanos = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int|string $seconds
+     *           Signed seconds of the span of time. Must be from -315,576,000,000
+     *           to +315,576,000,000 inclusive. Note: these bounds are computed from:
+     *           60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+     *     @type int $nanos
+     *           Signed fractions of a second at nanosecond resolution of the span
+     *           of time. Durations less than one second are represented with a 0
+     *           `seconds` field and a positive or negative `nanos` field. For durations
+     *           of one second or more, a non-zero value for the `nanos` field must be
+     *           of the same sign as the `seconds` field. Must be from -999,999,999
+     *           to +999,999,999 inclusive.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Duration::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Signed seconds of the span of time. Must be from -315,576,000,000
+     * to +315,576,000,000 inclusive. Note: these bounds are computed from:
+     * 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     * @return int|string
+     */
+    public function getSeconds()
+    {
+        return $this->seconds;
+    }
+
+    /**
+     * Signed seconds of the span of time. Must be from -315,576,000,000
+     * to +315,576,000,000 inclusive. Note: these bounds are computed from:
+     * 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     * @param int|string $var
+     * @return $this
+     */
+    public function setSeconds($var)
+    {
+        GPBUtil::checkInt64($var);
+        $this->seconds = $var;
+
+        return $this;
+    }
+
+    /**
+     * Signed fractions of a second at nanosecond resolution of the span
+     * of time. Durations less than one second are represented with a 0
+     * `seconds` field and a positive or negative `nanos` field. For durations
+     * of one second or more, a non-zero value for the `nanos` field must be
+     * of the same sign as the `seconds` field. Must be from -999,999,999
+     * to +999,999,999 inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     * @return int
+     */
+    public function getNanos()
+    {
+        return $this->nanos;
+    }
+
+    /**
+     * Signed fractions of a second at nanosecond resolution of the span
+     * of time. Durations less than one second are represented with a 0
+     * `seconds` field and a positive or negative `nanos` field. For durations
+     * of one second or more, a non-zero value for the `nanos` field must be
+     * of the same sign as the `seconds` field. Must be from -999,999,999
+     * to +999,999,999 inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setNanos($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->nanos = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Enum.php b/php/src/Google/Protobuf/Enum.php
new file mode 100644
index 00000000..243c40d2
--- /dev/null
+++ b/php/src/Google/Protobuf/Enum.php
@@ -0,0 +1,203 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Enum type definition.
+ *
+ * Generated from protobuf message <code>google.protobuf.Enum</code>
+ */
+class Enum extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Enum type name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * Enum value definitions.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValue enumvalue = 2;</code>
+     */
+    private $enumvalue;
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     */
+    private $options;
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 4;</code>
+     */
+    private $source_context = null;
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 5;</code>
+     */
+    private $syntax = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           Enum type name.
+     *     @type \Google\Protobuf\EnumValue[]|\Google\Protobuf\Internal\RepeatedField $enumvalue
+     *           Enum value definitions.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           Protocol buffer options.
+     *     @type \Google\Protobuf\SourceContext $source_context
+     *           The source context.
+     *     @type int $syntax
+     *           The source syntax.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Enum type name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Enum type name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * Enum value definitions.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValue enumvalue = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getEnumvalue()
+    {
+        return $this->enumvalue;
+    }
+
+    /**
+     * Enum value definitions.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValue enumvalue = 2;</code>
+     * @param \Google\Protobuf\EnumValue[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setEnumvalue($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\EnumValue::class);
+        $this->enumvalue = $arr;
+
+        return $this;
+    }
+
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 4;</code>
+     * @return \Google\Protobuf\SourceContext
+     */
+    public function getSourceContext()
+    {
+        return $this->source_context;
+    }
+
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 4;</code>
+     * @param \Google\Protobuf\SourceContext $var
+     * @return $this
+     */
+    public function setSourceContext($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\SourceContext::class);
+        $this->source_context = $var;
+
+        return $this;
+    }
+
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 5;</code>
+     * @return int
+     */
+    public function getSyntax()
+    {
+        return $this->syntax;
+    }
+
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 5;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setSyntax($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Syntax::class);
+        $this->syntax = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/EnumDescriptor.php b/php/src/Google/Protobuf/EnumDescriptor.php
new file mode 100644
index 00000000..a8b56c0d
--- /dev/null
+++ b/php/src/Google/Protobuf/EnumDescriptor.php
@@ -0,0 +1,79 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf;
+
+class EnumDescriptor
+{
+    private $internal_desc;
+
+    /**
+     * @internal
+     */
+    public function __construct($internal_desc)
+    {
+        $this->internal_desc = $internal_desc;
+    }
+
+    /**
+     * @return string Full protobuf message name
+     */
+    public function getFullName()
+    {
+        return $this->internal_desc->getFullName();
+    }
+
+    /**
+     * @return string PHP class name
+     */
+    public function getClass()
+    {
+        return $this->internal_desc->getClass();
+    }
+
+    /**
+     * @param int $index Must be >= 0 and < getValueCount()
+     * @return EnumValueDescriptor
+     */
+    public function getValue($index)
+    {
+        return $this->internal_desc->getValueDescriptorByIndex($index);
+    }
+
+    /**
+     * @return int Number of values in enum
+     */
+    public function getValueCount()
+    {
+        return $this->internal_desc->getValueCount();
+    }
+}
diff --git a/php/src/Google/Protobuf/EnumValue.php b/php/src/Google/Protobuf/EnumValue.php
new file mode 100644
index 00000000..1dc3c7a6
--- /dev/null
+++ b/php/src/Google/Protobuf/EnumValue.php
@@ -0,0 +1,135 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Enum value definition.
+ *
+ * Generated from protobuf message <code>google.protobuf.EnumValue</code>
+ */
+class EnumValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Enum value name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * Enum value number.
+     *
+     * Generated from protobuf field <code>int32 number = 2;</code>
+     */
+    private $number = 0;
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     */
+    private $options;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           Enum value name.
+     *     @type int $number
+     *           Enum value number.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           Protocol buffer options.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Enum value name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Enum value name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * Enum value number.
+     *
+     * Generated from protobuf field <code>int32 number = 2;</code>
+     * @return int
+     */
+    public function getNumber()
+    {
+        return $this->number;
+    }
+
+    /**
+     * Enum value number.
+     *
+     * Generated from protobuf field <code>int32 number = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setNumber($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->number = $var;
+
+        return $this;
+    }
+
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * Protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 3;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+}
+
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto b/php/src/Google/Protobuf/EnumValueDescriptor.php
index 1a3ddc57..e76e1997 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_import_nano.proto
+++ b/php/src/Google/Protobuf/EnumValueDescriptor.php
@@ -1,3 +1,5 @@
+<?php
+
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
@@ -28,21 +30,35 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//
-// This is like unittest_import.proto but with optimize_for = NANO_RUNTIME.
+namespace Google\Protobuf;
 
-package protobuf_unittest_import;
+class EnumValueDescriptor
+{
+    private $name;
+    private $number;
 
-option java_package = "com.google.protobuf.nano.testimport";
-option java_outer_classname = "UnittestImportNano";
+    /**
+     * @internal
+     */
+    public function __construct($name, $number)
+    {
+        $this->name = $name;
+        $this->number = $number;
+    }
 
-message ImportMessageNano {
-  optional int32 d = 1;
-}
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
 
-enum ImportEnumNano {
-  IMPORT_NANO_FOO = 7;
-  IMPORT_NANO_BAR = 8;
-  IMPORT_NANO_BAZ = 9;
+    /**
+     * @return int
+     */
+    public function getNumber()
+    {
+        return $this->number;
+    }
 }
diff --git a/php/src/Google/Protobuf/Field.php b/php/src/Google/Protobuf/Field.php
new file mode 100644
index 00000000..8da43e34
--- /dev/null
+++ b/php/src/Google/Protobuf/Field.php
@@ -0,0 +1,381 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A single field of a message type.
+ *
+ * Generated from protobuf message <code>google.protobuf.Field</code>
+ */
+class Field extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The field type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Kind kind = 1;</code>
+     */
+    private $kind = 0;
+    /**
+     * The field cardinality.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Cardinality cardinality = 2;</code>
+     */
+    private $cardinality = 0;
+    /**
+     * The field number.
+     *
+     * Generated from protobuf field <code>int32 number = 3;</code>
+     */
+    private $number = 0;
+    /**
+     * The field name.
+     *
+     * Generated from protobuf field <code>string name = 4;</code>
+     */
+    private $name = '';
+    /**
+     * The field type URL, without the scheme, for message or enumeration
+     * types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
+     *
+     * Generated from protobuf field <code>string type_url = 6;</code>
+     */
+    private $type_url = '';
+    /**
+     * The index of the field type in `Type.oneofs`, for message or enumeration
+     * types. The first type has index 1; zero means the type is not in the list.
+     *
+     * Generated from protobuf field <code>int32 oneof_index = 7;</code>
+     */
+    private $oneof_index = 0;
+    /**
+     * Whether to use alternative packed wire representation.
+     *
+     * Generated from protobuf field <code>bool packed = 8;</code>
+     */
+    private $packed = false;
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 9;</code>
+     */
+    private $options;
+    /**
+     * The field JSON name.
+     *
+     * Generated from protobuf field <code>string json_name = 10;</code>
+     */
+    private $json_name = '';
+    /**
+     * The string value of the default value of this field. Proto2 syntax only.
+     *
+     * Generated from protobuf field <code>string default_value = 11;</code>
+     */
+    private $default_value = '';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $kind
+     *           The field type.
+     *     @type int $cardinality
+     *           The field cardinality.
+     *     @type int $number
+     *           The field number.
+     *     @type string $name
+     *           The field name.
+     *     @type string $type_url
+     *           The field type URL, without the scheme, for message or enumeration
+     *           types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
+     *     @type int $oneof_index
+     *           The index of the field type in `Type.oneofs`, for message or enumeration
+     *           types. The first type has index 1; zero means the type is not in the list.
+     *     @type bool $packed
+     *           Whether to use alternative packed wire representation.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           The protocol buffer options.
+     *     @type string $json_name
+     *           The field JSON name.
+     *     @type string $default_value
+     *           The string value of the default value of this field. Proto2 syntax only.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The field type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Kind kind = 1;</code>
+     * @return int
+     */
+    public function getKind()
+    {
+        return $this->kind;
+    }
+
+    /**
+     * The field type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Kind kind = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setKind($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Field_Kind::class);
+        $this->kind = $var;
+
+        return $this;
+    }
+
+    /**
+     * The field cardinality.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Cardinality cardinality = 2;</code>
+     * @return int
+     */
+    public function getCardinality()
+    {
+        return $this->cardinality;
+    }
+
+    /**
+     * The field cardinality.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Field.Cardinality cardinality = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setCardinality($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Field_Cardinality::class);
+        $this->cardinality = $var;
+
+        return $this;
+    }
+
+    /**
+     * The field number.
+     *
+     * Generated from protobuf field <code>int32 number = 3;</code>
+     * @return int
+     */
+    public function getNumber()
+    {
+        return $this->number;
+    }
+
+    /**
+     * The field number.
+     *
+     * Generated from protobuf field <code>int32 number = 3;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setNumber($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->number = $var;
+
+        return $this;
+    }
+
+    /**
+     * The field name.
+     *
+     * Generated from protobuf field <code>string name = 4;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The field name.
+     *
+     * Generated from protobuf field <code>string name = 4;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * The field type URL, without the scheme, for message or enumeration
+     * types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
+     *
+     * Generated from protobuf field <code>string type_url = 6;</code>
+     * @return string
+     */
+    public function getTypeUrl()
+    {
+        return $this->type_url;
+    }
+
+    /**
+     * The field type URL, without the scheme, for message or enumeration
+     * types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
+     *
+     * Generated from protobuf field <code>string type_url = 6;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setTypeUrl($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->type_url = $var;
+
+        return $this;
+    }
+
+    /**
+     * The index of the field type in `Type.oneofs`, for message or enumeration
+     * types. The first type has index 1; zero means the type is not in the list.
+     *
+     * Generated from protobuf field <code>int32 oneof_index = 7;</code>
+     * @return int
+     */
+    public function getOneofIndex()
+    {
+        return $this->oneof_index;
+    }
+
+    /**
+     * The index of the field type in `Type.oneofs`, for message or enumeration
+     * types. The first type has index 1; zero means the type is not in the list.
+     *
+     * Generated from protobuf field <code>int32 oneof_index = 7;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setOneofIndex($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->oneof_index = $var;
+
+        return $this;
+    }
+
+    /**
+     * Whether to use alternative packed wire representation.
+     *
+     * Generated from protobuf field <code>bool packed = 8;</code>
+     * @return bool
+     */
+    public function getPacked()
+    {
+        return $this->packed;
+    }
+
+    /**
+     * Whether to use alternative packed wire representation.
+     *
+     * Generated from protobuf field <code>bool packed = 8;</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setPacked($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->packed = $var;
+
+        return $this;
+    }
+
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 9;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 9;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The field JSON name.
+     *
+     * Generated from protobuf field <code>string json_name = 10;</code>
+     * @return string
+     */
+    public function getJsonName()
+    {
+        return $this->json_name;
+    }
+
+    /**
+     * The field JSON name.
+     *
+     * Generated from protobuf field <code>string json_name = 10;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setJsonName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->json_name = $var;
+
+        return $this;
+    }
+
+    /**
+     * The string value of the default value of this field. Proto2 syntax only.
+     *
+     * Generated from protobuf field <code>string default_value = 11;</code>
+     * @return string
+     */
+    public function getDefaultValue()
+    {
+        return $this->default_value;
+    }
+
+    /**
+     * The string value of the default value of this field. Proto2 syntax only.
+     *
+     * Generated from protobuf field <code>string default_value = 11;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setDefaultValue($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->default_value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Field/Cardinality.php b/php/src/Google/Protobuf/Field/Cardinality.php
new file mode 100644
index 00000000..c887f6d3
--- /dev/null
+++ b/php/src/Google/Protobuf/Field/Cardinality.php
@@ -0,0 +1,42 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf\Field;
+
+/**
+ * Whether a field is optional, required, or repeated.
+ *
+ * Protobuf type <code>google.protobuf.Field.Cardinality</code>
+ */
+class Cardinality
+{
+    /**
+     * For fields with unknown cardinality.
+     *
+     * Generated from protobuf enum <code>CARDINALITY_UNKNOWN = 0;</code>
+     */
+    const CARDINALITY_UNKNOWN = 0;
+    /**
+     * For optional fields.
+     *
+     * Generated from protobuf enum <code>CARDINALITY_OPTIONAL = 1;</code>
+     */
+    const CARDINALITY_OPTIONAL = 1;
+    /**
+     * For required fields. Proto2 syntax only.
+     *
+     * Generated from protobuf enum <code>CARDINALITY_REQUIRED = 2;</code>
+     */
+    const CARDINALITY_REQUIRED = 2;
+    /**
+     * For repeated fields.
+     *
+     * Generated from protobuf enum <code>CARDINALITY_REPEATED = 3;</code>
+     */
+    const CARDINALITY_REPEATED = 3;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Cardinality::class, \Google\Protobuf\Field_Cardinality::class);
+
diff --git a/php/src/Google/Protobuf/Field/Kind.php b/php/src/Google/Protobuf/Field/Kind.php
new file mode 100644
index 00000000..a2bbbdeb
--- /dev/null
+++ b/php/src/Google/Protobuf/Field/Kind.php
@@ -0,0 +1,132 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf\Field;
+
+/**
+ * Basic field types.
+ *
+ * Protobuf type <code>google.protobuf.Field.Kind</code>
+ */
+class Kind
+{
+    /**
+     * Field type unknown.
+     *
+     * Generated from protobuf enum <code>TYPE_UNKNOWN = 0;</code>
+     */
+    const TYPE_UNKNOWN = 0;
+    /**
+     * Field type double.
+     *
+     * Generated from protobuf enum <code>TYPE_DOUBLE = 1;</code>
+     */
+    const TYPE_DOUBLE = 1;
+    /**
+     * Field type float.
+     *
+     * Generated from protobuf enum <code>TYPE_FLOAT = 2;</code>
+     */
+    const TYPE_FLOAT = 2;
+    /**
+     * Field type int64.
+     *
+     * Generated from protobuf enum <code>TYPE_INT64 = 3;</code>
+     */
+    const TYPE_INT64 = 3;
+    /**
+     * Field type uint64.
+     *
+     * Generated from protobuf enum <code>TYPE_UINT64 = 4;</code>
+     */
+    const TYPE_UINT64 = 4;
+    /**
+     * Field type int32.
+     *
+     * Generated from protobuf enum <code>TYPE_INT32 = 5;</code>
+     */
+    const TYPE_INT32 = 5;
+    /**
+     * Field type fixed64.
+     *
+     * Generated from protobuf enum <code>TYPE_FIXED64 = 6;</code>
+     */
+    const TYPE_FIXED64 = 6;
+    /**
+     * Field type fixed32.
+     *
+     * Generated from protobuf enum <code>TYPE_FIXED32 = 7;</code>
+     */
+    const TYPE_FIXED32 = 7;
+    /**
+     * Field type bool.
+     *
+     * Generated from protobuf enum <code>TYPE_BOOL = 8;</code>
+     */
+    const TYPE_BOOL = 8;
+    /**
+     * Field type string.
+     *
+     * Generated from protobuf enum <code>TYPE_STRING = 9;</code>
+     */
+    const TYPE_STRING = 9;
+    /**
+     * Field type group. Proto2 syntax only, and deprecated.
+     *
+     * Generated from protobuf enum <code>TYPE_GROUP = 10;</code>
+     */
+    const TYPE_GROUP = 10;
+    /**
+     * Field type message.
+     *
+     * Generated from protobuf enum <code>TYPE_MESSAGE = 11;</code>
+     */
+    const TYPE_MESSAGE = 11;
+    /**
+     * Field type bytes.
+     *
+     * Generated from protobuf enum <code>TYPE_BYTES = 12;</code>
+     */
+    const TYPE_BYTES = 12;
+    /**
+     * Field type uint32.
+     *
+     * Generated from protobuf enum <code>TYPE_UINT32 = 13;</code>
+     */
+    const TYPE_UINT32 = 13;
+    /**
+     * Field type enum.
+     *
+     * Generated from protobuf enum <code>TYPE_ENUM = 14;</code>
+     */
+    const TYPE_ENUM = 14;
+    /**
+     * Field type sfixed32.
+     *
+     * Generated from protobuf enum <code>TYPE_SFIXED32 = 15;</code>
+     */
+    const TYPE_SFIXED32 = 15;
+    /**
+     * Field type sfixed64.
+     *
+     * Generated from protobuf enum <code>TYPE_SFIXED64 = 16;</code>
+     */
+    const TYPE_SFIXED64 = 16;
+    /**
+     * Field type sint32.
+     *
+     * Generated from protobuf enum <code>TYPE_SINT32 = 17;</code>
+     */
+    const TYPE_SINT32 = 17;
+    /**
+     * Field type sint64.
+     *
+     * Generated from protobuf enum <code>TYPE_SINT64 = 18;</code>
+     */
+    const TYPE_SINT64 = 18;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Kind::class, \Google\Protobuf\Field_Kind::class);
+
diff --git a/php/src/Google/Protobuf/FieldDescriptor.php b/php/src/Google/Protobuf/FieldDescriptor.php
new file mode 100644
index 00000000..ac9271f9
--- /dev/null
+++ b/php/src/Google/Protobuf/FieldDescriptor.php
@@ -0,0 +1,117 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GetPublicDescriptorTrait;
+use Google\Protobuf\Internal\GPBType;
+
+class FieldDescriptor
+{
+    use GetPublicDescriptorTrait;
+
+    private $internal_desc;
+
+    /**
+     * @internal
+     */
+    public function __construct($internal_desc)
+    {
+        $this->internal_desc = $internal_desc;
+    }
+
+    /**
+     * @return string Field name
+     */
+    public function getName()
+    {
+        return $this->internal_desc->getName();
+    }
+
+    /**
+     * @return int Protobuf field number
+     */
+    public function getNumber()
+    {
+        return $this->internal_desc->getNumber();
+    }
+
+    /**
+     * @return int
+     */
+    public function getLabel()
+    {
+        return $this->internal_desc->getLabel();
+    }
+
+    /**
+     * @return int
+     */
+    public function getType()
+    {
+        return $this->internal_desc->getType();
+    }
+
+    /**
+     * @return Descriptor Returns a descriptor for the field type if the field type is a message, otherwise throws \Exception
+     * @throws \Exception
+     */
+    public function getMessageType()
+    {
+        if ($this->getType() == GPBType::MESSAGE) {
+            return $this->getPublicDescriptor($this->internal_desc->getMessageType());
+        } else {
+            throw new \Exception("Cannot get message type for non-message field '" . $this->getName() . "'");
+        }
+    }
+
+    /**
+     * @return EnumDescriptor Returns an enum descriptor if the field type is an enum, otherwise throws \Exception
+     * @throws \Exception
+     */
+    public function getEnumType()
+    {
+        if ($this->getType() == GPBType::ENUM) {
+            return $this->getPublicDescriptor($this->internal_desc->getEnumType());
+        } else {
+            throw new \Exception("Cannot get enum type for non-enum field '" . $this->getName() . "'");
+        }
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isMap()
+    {
+        return $this->internal_desc->isMap();
+    }
+}
diff --git a/php/src/Google/Protobuf/FieldMask.php b/php/src/Google/Protobuf/FieldMask.php
new file mode 100644
index 00000000..8fb38cbf
--- /dev/null
+++ b/php/src/Google/Protobuf/FieldMask.php
@@ -0,0 +1,223 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/field_mask.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `FieldMask` represents a set of symbolic field paths, for example:
+ *     paths: "f.a"
+ *     paths: "f.b.d"
+ * Here `f` represents a field in some root message, `a` and `b`
+ * fields in the message found in `f`, and `d` a field found in the
+ * message in `f.b`.
+ * Field masks are used to specify a subset of fields that should be
+ * returned by a get operation or modified by an update operation.
+ * Field masks also have a custom JSON encoding (see below).
+ * # Field Masks in Projections
+ * When used in the context of a projection, a response message or
+ * sub-message is filtered by the API to only contain those fields as
+ * specified in the mask. For example, if the mask in the previous
+ * example is applied to a response message as follows:
+ *     f {
+ *       a : 22
+ *       b {
+ *         d : 1
+ *         x : 2
+ *       }
+ *       y : 13
+ *     }
+ *     z: 8
+ * The result will not contain specific values for fields x,y and z
+ * (their value will be set to the default, and omitted in proto text
+ * output):
+ *     f {
+ *       a : 22
+ *       b {
+ *         d : 1
+ *       }
+ *     }
+ * A repeated field is not allowed except at the last position of a
+ * paths string.
+ * If a FieldMask object is not present in a get operation, the
+ * operation applies to all fields (as if a FieldMask of all fields
+ * had been specified).
+ * Note that a field mask does not necessarily apply to the
+ * top-level response message. In case of a REST get operation, the
+ * field mask applies directly to the response, but in case of a REST
+ * list operation, the mask instead applies to each individual message
+ * in the returned resource list. In case of a REST custom method,
+ * other definitions may be used. Where the mask applies will be
+ * clearly documented together with its declaration in the API.  In
+ * any case, the effect on the returned resource/resources is required
+ * behavior for APIs.
+ * # Field Masks in Update Operations
+ * A field mask in update operations specifies which fields of the
+ * targeted resource are going to be updated. The API is required
+ * to only change the values of the fields as specified in the mask
+ * and leave the others untouched. If a resource is passed in to
+ * describe the updated values, the API ignores the values of all
+ * fields not covered by the mask.
+ * If a repeated field is specified for an update operation, the existing
+ * repeated values in the target resource will be overwritten by the new values.
+ * Note that a repeated field is only allowed in the last position of a `paths`
+ * string.
+ * If a sub-message is specified in the last position of the field mask for an
+ * update operation, then the existing sub-message in the target resource is
+ * overwritten. Given the target message:
+ *     f {
+ *       b {
+ *         d : 1
+ *         x : 2
+ *       }
+ *       c : 1
+ *     }
+ * And an update message:
+ *     f {
+ *       b {
+ *         d : 10
+ *       }
+ *     }
+ * then if the field mask is:
+ *  paths: "f.b"
+ * then the result will be:
+ *     f {
+ *       b {
+ *         d : 10
+ *       }
+ *       c : 1
+ *     }
+ * However, if the update mask was:
+ *  paths: "f.b.d"
+ * then the result would be:
+ *     f {
+ *       b {
+ *         d : 10
+ *         x : 2
+ *       }
+ *       c : 1
+ *     }
+ * In order to reset a field's value to the default, the field must
+ * be in the mask and set to the default value in the provided resource.
+ * Hence, in order to reset all fields of a resource, provide a default
+ * instance of the resource and set all fields in the mask, or do
+ * not provide a mask as described below.
+ * If a field mask is not present on update, the operation applies to
+ * all fields (as if a field mask of all fields has been specified).
+ * Note that in the presence of schema evolution, this may mean that
+ * fields the client does not know and has therefore not filled into
+ * the request will be reset to their default. If this is unwanted
+ * behavior, a specific service may require a client to always specify
+ * a field mask, producing an error if not.
+ * As with get operations, the location of the resource which
+ * describes the updated values in the request message depends on the
+ * operation kind. In any case, the effect of the field mask is
+ * required to be honored by the API.
+ * ## Considerations for HTTP REST
+ * The HTTP kind of an update operation which uses a field mask must
+ * be set to PATCH instead of PUT in order to satisfy HTTP semantics
+ * (PUT must only be used for full updates).
+ * # JSON Encoding of Field Masks
+ * In JSON, a field mask is encoded as a single string where paths are
+ * separated by a comma. Fields name in each path are converted
+ * to/from lower-camel naming conventions.
+ * As an example, consider the following message declarations:
+ *     message Profile {
+ *       User user = 1;
+ *       Photo photo = 2;
+ *     }
+ *     message User {
+ *       string display_name = 1;
+ *       string address = 2;
+ *     }
+ * In proto a field mask for `Profile` may look as such:
+ *     mask {
+ *       paths: "user.display_name"
+ *       paths: "photo"
+ *     }
+ * In JSON, the same mask is represented as below:
+ *     {
+ *       mask: "user.displayName,photo"
+ *     }
+ * # Field Masks and Oneof Fields
+ * Field masks treat fields in oneofs just as regular fields. Consider the
+ * following message:
+ *     message SampleMessage {
+ *       oneof test_oneof {
+ *         string name = 4;
+ *         SubMessage sub_message = 9;
+ *       }
+ *     }
+ * The field mask can be:
+ *     mask {
+ *       paths: "name"
+ *     }
+ * Or:
+ *     mask {
+ *       paths: "sub_message"
+ *     }
+ * Note that oneof type names ("test_oneof" in this case) cannot be used in
+ * paths.
+ * ## Field Mask Verification
+ * The implementation of any API method which has a FieldMask type field in the
+ * request should verify the included field paths, and return an
+ * `INVALID_ARGUMENT` error if any path is duplicated or unmappable.
+ *
+ * Generated from protobuf message <code>google.protobuf.FieldMask</code>
+ */
+class FieldMask extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The set of field mask paths.
+     *
+     * Generated from protobuf field <code>repeated string paths = 1;</code>
+     */
+    private $paths;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $paths
+     *           The set of field mask paths.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\FieldMask::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The set of field mask paths.
+     *
+     * Generated from protobuf field <code>repeated string paths = 1;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getPaths()
+    {
+        return $this->paths;
+    }
+
+    /**
+     * The set of field mask paths.
+     *
+     * Generated from protobuf field <code>repeated string paths = 1;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setPaths($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->paths = $arr;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Field_Cardinality.php b/php/src/Google/Protobuf/Field_Cardinality.php
new file mode 100644
index 00000000..dff8f893
--- /dev/null
+++ b/php/src/Google/Protobuf/Field_Cardinality.php
@@ -0,0 +1,16 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+if (false) {
+    /**
+     * This class is deprecated. Use Google\Protobuf\Field\Cardinality instead.
+     * @deprecated
+     */
+    class Field_Cardinality {}
+}
+class_exists(Field\Cardinality::class);
+@trigger_error('Google\Protobuf\Field_Cardinality is deprecated and will be removed in the next major release. Use Google\Protobuf\Field\Cardinality instead', E_USER_DEPRECATED);
+
diff --git a/php/src/Google/Protobuf/Field_Kind.php b/php/src/Google/Protobuf/Field_Kind.php
new file mode 100644
index 00000000..aa202370
--- /dev/null
+++ b/php/src/Google/Protobuf/Field_Kind.php
@@ -0,0 +1,16 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+if (false) {
+    /**
+     * This class is deprecated. Use Google\Protobuf\Field\Kind instead.
+     * @deprecated
+     */
+    class Field_Kind {}
+}
+class_exists(Field\Kind::class);
+@trigger_error('Google\Protobuf\Field_Kind is deprecated and will be removed in the next major release. Use Google\Protobuf\Field\Kind instead', E_USER_DEPRECATED);
+
diff --git a/php/src/Google/Protobuf/FloatValue.php b/php/src/Google/Protobuf/FloatValue.php
new file mode 100644
index 00000000..47ba52e6
--- /dev/null
+++ b/php/src/Google/Protobuf/FloatValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `float`.
+ * The JSON representation for `FloatValue` is JSON number.
+ *
+ * Generated from protobuf message <code>google.protobuf.FloatValue</code>
+ */
+class FloatValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The float value.
+     *
+     * Generated from protobuf field <code>float value = 1;</code>
+     */
+    private $value = 0.0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type float $value
+     *           The float value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The float value.
+     *
+     * Generated from protobuf field <code>float value = 1;</code>
+     * @return float
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The float value.
+     *
+     * Generated from protobuf field <code>float value = 1;</code>
+     * @param float $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkFloat($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/GPBEmpty.php b/php/src/Google/Protobuf/GPBEmpty.php
new file mode 100644
index 00000000..2de9c3bc
--- /dev/null
+++ b/php/src/Google/Protobuf/GPBEmpty.php
@@ -0,0 +1,39 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/empty.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A generic empty message that you can re-use to avoid defining duplicated
+ * empty messages in your APIs. A typical example is to use it as the request
+ * or the response type of an API method. For instance:
+ *     service Foo {
+ *       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+ *     }
+ * The JSON representation for `Empty` is empty JSON object `{}`.
+ *
+ * Generated from protobuf message <code>google.protobuf.Empty</code>
+ */
+class GPBEmpty extends \Google\Protobuf\Internal\Message
+{
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\GPBEmpty::initOnce();
+        parent::__construct($data);
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Int32Value.php b/php/src/Google/Protobuf/Int32Value.php
new file mode 100644
index 00000000..d7fd528d
--- /dev/null
+++ b/php/src/Google/Protobuf/Int32Value.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `int32`.
+ * The JSON representation for `Int32Value` is JSON number.
+ *
+ * Generated from protobuf message <code>google.protobuf.Int32Value</code>
+ */
+class Int32Value extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The int32 value.
+     *
+     * Generated from protobuf field <code>int32 value = 1;</code>
+     */
+    private $value = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $value
+     *           The int32 value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The int32 value.
+     *
+     * Generated from protobuf field <code>int32 value = 1;</code>
+     * @return int
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The int32 value.
+     *
+     * Generated from protobuf field <code>int32 value = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Int64Value.php b/php/src/Google/Protobuf/Int64Value.php
new file mode 100644
index 00000000..ca663055
--- /dev/null
+++ b/php/src/Google/Protobuf/Int64Value.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `int64`.
+ * The JSON representation for `Int64Value` is JSON string.
+ *
+ * Generated from protobuf message <code>google.protobuf.Int64Value</code>
+ */
+class Int64Value extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The int64 value.
+     *
+     * Generated from protobuf field <code>int64 value = 1;</code>
+     */
+    private $value = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int|string $value
+     *           The int64 value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The int64 value.
+     *
+     * Generated from protobuf field <code>int64 value = 1;</code>
+     * @return int|string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The int64 value.
+     *
+     * Generated from protobuf field <code>int64 value = 1;</code>
+     * @param int|string $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkInt64($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Internal/InputStream.php b/php/src/Google/Protobuf/Internal/CodedInputStream.php
index bf052c2f..b612da5b 100644
--- a/php/src/Google/Protobuf/Internal/InputStream.php
+++ b/php/src/Google/Protobuf/Internal/CodedInputStream.php
@@ -34,28 +34,7 @@ namespace Google\Protobuf\Internal;
 
 use Google\Protobuf\Internal\Uint64;
 
-function combineInt32ToInt64($high, $low)
-{
-    $isNeg = $high < 0;
-    if ($isNeg) {
-        $high = ~$high;
-        $low = ~$low;
-        $low++;
-        if (!$low) {
-            $high++;
-        }
-    }
-    $result = bcadd(bcmul($high, 4294967296), $low);
-    if ($low < 0) {
-        $result = bcadd($result, 4294967296);
-    }
-    if ($isNeg) {
-      $result = bcsub(0, $result);
-    }
-    return $result;
-}
-
-class InputStream
+class CodedInputStream
 {
 
     private $buffer;
@@ -70,7 +49,6 @@ class InputStream
     private $total_bytes_read;
 
     const MAX_VARINT_BYTES = 10;
-    const MAX_VARINT32_BYTES = 5;
     const DEFAULT_RECURSION_LIMIT = 100;
     const DEFAULT_TOTAL_BYTES_LIMIT = 33554432; // 32 << 20, 32MB
 
@@ -95,18 +73,23 @@ class InputStream
         $this->current += $amount;
     }
 
-    private function bufferSize()
+    public function bufferSize()
     {
         return $this->buffer_end - $this->current;
     }
 
-    private function current()
+    public function current()
     {
         return $this->total_bytes_read -
             ($this->buffer_end - $this->current +
             $this->buffer_size_after_limit);
     }
 
+    public function substr($start, $end)
+    {
+        return substr($this->buffer, $start, $end - $start);
+    }
+
     private function recomputeBufferLimits()
     {
         $this->buffer_end += $this->buffer_size_after_limit;
@@ -193,7 +176,10 @@ class InputStream
                 $count += 1;
             } while ($b & 0x80);
 
-            $var = combineInt32ToInt64($high, $low);
+            $var = GPBUtil::combineInt32ToInt64($high, $low);
+            if (bccomp($var, 0) < 0) {
+                $var = bcadd($var, "18446744073709551616");
+            }
         } else {
             $result = 0;
             $shift = 0;
@@ -266,7 +252,7 @@ class InputStream
         }
         $high = unpack('V', $data)[1];
         if (PHP_INT_SIZE == 4) {
-            $var = combineInt32ToInt64($high, $low);
+            $var = GPBUtil::combineInt32ToInt64($high, $low);
         } else {
             $var = ($high << 32) | $low;
         }
@@ -331,6 +317,7 @@ class InputStream
      * passed unchanged to the corresponding call to popLimit().
      *
      * @param integer $byte_limit
+     * @throws Exception Fail to push limit.
      */
     public function pushLimit($byte_limit)
     {
@@ -340,19 +327,15 @@ class InputStream
 
         // security: byte_limit is possibly evil, so check for negative values
         // and overflow.
-        if ($byte_limit >= 0 && $byte_limit <= PHP_INT_MAX - $current_position) {
+        if ($byte_limit >= 0 &&
+            $byte_limit <= PHP_INT_MAX - $current_position &&
+            $byte_limit <= $this->current_limit - $current_position) {
             $this->current_limit = $current_position + $byte_limit;
+            $this->recomputeBufferLimits();
         } else {
-            // Negative or overflow.
-            $this->current_limit = PHP_INT_MAX;
+            throw new GPBDecodeException("Fail to push limit.");
         }
 
-        // We need to enforce all limits, not just the new one, so if the previous
-        // limit was before the new requested limit, we continue to enforce the
-        // previous limit.
-        $this->current_limit = min($this->current_limit, $old_limit);
-
-        $this->recomputeBufferLimits();
         return $old_limit;
     }
 
@@ -371,7 +354,7 @@ class InputStream
     }
 
     public function incrementRecursionDepthAndPushLimit(
-    $byte_limit, &$old_limit, &$recursion_budget)
+        $byte_limit, &$old_limit, &$recursion_budget)
     {
         $old_limit = $this->pushLimit($byte_limit);
         $recursion_limit = --$this->recursion_limit;
diff --git a/php/src/Google/Protobuf/Internal/OutputStream.php b/php/src/Google/Protobuf/Internal/CodedOutputStream.php
index 587ac352..f75e9c66 100644
--- a/php/src/Google/Protobuf/Internal/OutputStream.php
+++ b/php/src/Google/Protobuf/Internal/CodedOutputStream.php
@@ -32,14 +32,13 @@
 
 namespace Google\Protobuf\Internal;
 
-class OutputStream
+class CodedOutputStream
 {
 
     private $buffer;
     private $buffer_size;
     private $current;
 
-    const MAX_VARINT32_BYTES = 5;
     const MAX_VARINT64_BYTES = 10;
 
     public function __construct($size)
@@ -54,10 +53,10 @@ class OutputStream
         return $this->buffer;
     }
 
-    public function writeVarint32($value)
+    public function writeVarint32($value, $trim)
     {
-        $bytes = str_repeat(chr(0), self::MAX_VARINT32_BYTES);
-        $size = self::writeVarintToArray($value, $bytes, true);
+        $bytes = str_repeat(chr(0), self::MAX_VARINT64_BYTES);
+        $size = self::writeVarintToArray($value, $bytes, $trim);
         return $this->writeRaw($bytes, $size);
     }
 
@@ -84,7 +83,7 @@ class OutputStream
 
     public function writeTag($tag)
     {
-        return $this->writeVarint32($tag);
+        return $this->writeVarint32($tag, true);
     }
 
     public function writeRaw($data, $size)
@@ -102,7 +101,7 @@ class OutputStream
         return true;
     }
 
-    private static function writeVarintToArray($value, &$buffer, $trim = false)
+    public static function writeVarintToArray($value, &$buffer, $trim = false)
     {
         $current = 0;
 
@@ -111,14 +110,10 @@ class OutputStream
         if (PHP_INT_SIZE == 4) {
             GPBUtil::divideInt64ToInt32($value, $high, $low, $trim);
         } else {
-            if ($trim) {
-                $low = $value & 0xFFFFFFFF;
-            } else {
-                $low = $value;
-            }
+            $low = $value;
         }
 
-        while ($low >= 0x80 || $low < 0) {
+        while (($low >= 0x80 || $low < 0) || $high != 0) {
             $buffer[$current] = chr($low | 0x80);
             $value = ($value >> 7) & ~(0x7F << ((PHP_INT_SIZE << 3) - 7));
             $carry = ($high & 0x7F) << ((PHP_INT_SIZE << 3) - 7);
diff --git a/php/src/Google/Protobuf/Internal/Descriptor.php b/php/src/Google/Protobuf/Internal/Descriptor.php
new file mode 100644
index 00000000..ee3a8bde
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/Descriptor.php
@@ -0,0 +1,208 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class Descriptor
+{
+    use HasPublicDescriptorTrait;
+
+    private $full_name;
+    private $field = [];
+    private $json_to_field = [];
+    private $name_to_field = [];
+    private $index_to_field = [];
+    private $nested_type = [];
+    private $enum_type = [];
+    private $klass;
+    private $options;
+    private $oneof_decl = [];
+
+    public function __construct()
+    {
+        $this->public_desc = new \Google\Protobuf\Descriptor($this);
+    }
+
+    public function addOneofDecl($oneof)
+    {
+        $this->oneof_decl[] = $oneof;
+    }
+
+    public function getOneofDecl()
+    {
+        return $this->oneof_decl;
+    }
+
+    public function setFullName($full_name)
+    {
+        $this->full_name = $full_name;
+    }
+
+    public function getFullName()
+    {
+        return $this->full_name;
+    }
+
+    public function addField($field)
+    {
+        $this->field[$field->getNumber()] = $field;
+        $this->json_to_field[$field->getJsonName()] = $field;
+        $this->name_to_field[$field->getName()] = $field;
+        $this->index_to_field[] = $field;
+    }
+
+    public function getField()
+    {
+        return $this->field;
+    }
+
+    public function addNestedType($desc)
+    {
+        $this->nested_type[] = $desc;
+    }
+
+    public function getNestedType()
+    {
+        return $this->nested_type;
+    }
+
+    public function addEnumType($desc)
+    {
+        $this->enum_type[] = $desc;
+    }
+
+    public function getEnumType()
+    {
+        return $this->enum_type;
+    }
+
+    public function getFieldByNumber($number)
+    {
+        if (!isset($this->field[$number])) {
+          return NULL;
+        } else {
+          return $this->field[$number];
+        }
+    }
+
+    public function getFieldByJsonName($json_name)
+    {
+        if (!isset($this->json_to_field[$json_name])) {
+          return NULL;
+        } else {
+          return $this->json_to_field[$json_name];
+        }
+    }
+
+    public function getFieldByName($name)
+    {
+        if (!isset($this->name_to_field[$name])) {
+          return NULL;
+        } else {
+          return $this->name_to_field[$name];
+        }
+    }
+
+    public function getFieldByIndex($index)
+    {
+        if (count($this->index_to_field) <= $index) {
+            return NULL;
+        } else {
+            return $this->index_to_field[$index];
+        }
+    }
+
+    public function setClass($klass)
+    {
+        $this->klass = $klass;
+    }
+
+    public function getClass()
+    {
+        return $this->klass;
+    }
+
+    public function setOptions($options)
+    {
+        $this->options = $options;
+    }
+
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    public static function buildFromProto($proto, $file_proto, $containing)
+    {
+        $desc = new Descriptor();
+
+        $message_name_without_package  = "";
+        $classname = "";
+        $fullname = "";
+        GPBUtil::getFullClassName(
+            $proto,
+            $containing,
+            $file_proto,
+            $message_name_without_package,
+            $classname,
+            $fullname);
+        $desc->setFullName($fullname);
+        $desc->setClass($classname);
+        $desc->setOptions($proto->getOptions());
+
+        foreach ($proto->getField() as $field_proto) {
+            $desc->addField(FieldDescriptor::buildFromProto($field_proto));
+        }
+
+        // Handle nested types.
+        foreach ($proto->getNestedType() as $nested_proto) {
+            $desc->addNestedType(Descriptor::buildFromProto(
+              $nested_proto, $file_proto, $message_name_without_package));
+        }
+
+        // Handle nested enum.
+        foreach ($proto->getEnumType() as $enum_proto) {
+            $desc->addEnumType(EnumDescriptor::buildFromProto(
+              $enum_proto, $file_proto, $message_name_without_package));
+        }
+
+        // Handle oneof fields.
+        $index = 0;
+        foreach ($proto->getOneofDecl() as $oneof_proto) {
+            $desc->addOneofDecl(
+                OneofDescriptor::buildFromProto($oneof_proto, $desc, $index));
+            $index++;
+        }
+
+        return $desc;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/DescriptorPool.php b/php/src/Google/Protobuf/Internal/DescriptorPool.php
index 1ef403cf..304c1615 100644
--- a/php/src/Google/Protobuf/Internal/DescriptorPool.php
+++ b/php/src/Google/Protobuf/Internal/DescriptorPool.php
@@ -61,17 +61,17 @@ class DescriptorPool
         $files->mergeFromString($data);
         $file = FileDescriptor::buildFromProto($files->getFile()[0]);
 
-        foreach ($file->getMessageType() as &$desc) {
+        foreach ($file->getMessageType() as $desc) {
             $this->addDescriptor($desc);
         }
         unset($desc);
 
-        foreach ($file->getEnumType() as &$desc) {
+        foreach ($file->getEnumType() as $desc) {
             $this->addEnumDescriptor($desc);
         }
         unset($desc);
 
-        foreach ($file->getMessageType() as &$desc) {
+        foreach ($file->getMessageType() as $desc) {
             $this->crossLink($desc);
         }
         unset($desc);
@@ -95,6 +95,9 @@ class DescriptorPool
         foreach ($descriptor->getNestedType() as $nested_type) {
             $this->addDescriptor($nested_type);
         }
+        foreach ($descriptor->getEnumType() as $enum_type) {
+            $this->addEnumDescriptor($enum_type);
+        }
     }
 
     public function addEnumDescriptor($descriptor)
@@ -106,18 +109,30 @@ class DescriptorPool
 
     public function getDescriptorByClassName($klass)
     {
-        return $this->class_to_desc[$klass];
+        if (isset($this->class_to_desc[$klass])) {
+            return $this->class_to_desc[$klass];
+        } else {
+            return null;
+        }
     }
 
     public function getEnumDescriptorByClassName($klass)
     {
-        return $this->class_to_enum_desc[$klass];
+        if (isset($this->class_to_enum_desc[$klass])) {
+            return $this->class_to_enum_desc[$klass];
+        } else {
+            return null;
+        }
     }
 
     public function getDescriptorByProtoName($proto)
     {
-        $klass = $this->proto_to_class[$proto];
-        return $this->class_to_desc[$klass];
+        if (isset($this->proto_to_class[$proto])) {
+            $klass = $this->proto_to_class[$proto];
+            return $this->class_to_desc[$klass];
+        } else {
+          return null;
+        }
     }
 
     public function getEnumDescriptorByProtoName($proto)
@@ -126,9 +141,9 @@ class DescriptorPool
         return $this->class_to_enum_desc[$klass];
     }
 
-    private function crossLink(&$desc)
+    private function crossLink(Descriptor $desc)
     {
-        foreach ($desc->getField() as &$field) {
+        foreach ($desc->getField() as $field) {
             switch ($field->getType()) {
                 case GPBType::MESSAGE:
                     $proto = $field->getMessageType();
@@ -146,7 +161,7 @@ class DescriptorPool
         }
         unset($field);
 
-        foreach ($desc->getNestedType() as &$nested_type) {
+        foreach ($desc->getNestedType() as $nested_type) {
             $this->crossLink($nested_type);
         }
         unset($nested_type);
@@ -154,7 +169,7 @@ class DescriptorPool
 
     public function finish()
     {
-        foreach ($this->class_to_desc as $klass => &$desc) {
+        foreach ($this->class_to_desc as $klass => $desc) {
             $this->crossLink($desc);
         }
         unset($desc);
diff --git a/php/src/Google/Protobuf/Internal/DescriptorProto.php b/php/src/Google/Protobuf/Internal/DescriptorProto.php
index f076f6be..3b215d52 100644
--- a/php/src/Google/Protobuf/Internal/DescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/DescriptorProto.php
@@ -8,81 +8,97 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a message type.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.DescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.DescriptorProto</code>
  */
 class DescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
      */
     private $field;
     private $has_field = false;
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
      */
     private $extension;
     private $has_extension = false;
     /**
-     * <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
      */
     private $nested_type;
     private $has_nested_type = false;
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
      */
     private $enum_type;
     private $has_enum_type = false;
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
      */
     private $extension_range;
     private $has_extension_range = false;
     /**
-     * <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
      */
     private $oneof_decl;
     private $has_oneof_decl = false;
     /**
-     * <code>optional .google.protobuf.MessageOptions options = 7;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MessageOptions options = 7;</code>
      */
     private $options = null;
     private $has_options = false;
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
      */
     private $reserved_range;
     private $has_reserved_range = false;
     /**
-     * <pre>
      * Reserved field names, which may not be used by fields in the same message.
      * A given name may only be reserved once.
-     * </pre>
      *
-     * <code>repeated string reserved_name = 10;</code>
+     * Generated from protobuf field <code>repeated string reserved_name = 10;</code>
      */
     private $reserved_name;
     private $has_reserved_name = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $field
+     *     @type \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $extension
+     *     @type \Google\Protobuf\Internal\DescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $nested_type
+     *     @type \Google\Protobuf\Internal\EnumDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $enum_type
+     *     @type \Google\Protobuf\Internal\DescriptorProto\ExtensionRange[]|\Google\Protobuf\Internal\RepeatedField $extension_range
+     *     @type \Google\Protobuf\Internal\OneofDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $oneof_decl
+     *     @type \Google\Protobuf\Internal\MessageOptions $options
+     *     @type \Google\Protobuf\Internal\DescriptorProto\ReservedRange[]|\Google\Protobuf\Internal\RepeatedField $reserved_range
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $reserved_name
+     *           Reserved field names, which may not be used by fields in the same message.
+     *           A given name may only be reserved once.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -90,13 +106,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -105,7 +125,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getField()
     {
@@ -113,13 +134,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto field = 2;</code>
+     * @param \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setField(&$var)
+    public function setField($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
-        $this->field = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
+        $this->field = $arr;
         $this->has_field = true;
+
+        return $this;
     }
 
     public function hasField()
@@ -128,7 +153,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getExtension()
     {
@@ -136,13 +162,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 6;</code>
+     * @param \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setExtension(&$var)
+    public function setExtension($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
-        $this->extension = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
+        $this->extension = $arr;
         $this->has_extension = true;
+
+        return $this;
     }
 
     public function hasExtension()
@@ -151,7 +181,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getNestedType()
     {
@@ -159,13 +190,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto nested_type = 3;</code>
+     * @param \Google\Protobuf\Internal\DescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setNestedType(&$var)
+    public function setNestedType($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto::class);
-        $this->nested_type = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto::class);
+        $this->nested_type = $arr;
         $this->has_nested_type = true;
+
+        return $this;
     }
 
     public function hasNestedType()
@@ -174,7 +209,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getEnumType()
     {
@@ -182,13 +218,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 4;</code>
+     * @param \Google\Protobuf\Internal\EnumDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setEnumType(&$var)
+    public function setEnumType($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumDescriptorProto::class);
-        $this->enum_type = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumDescriptorProto::class);
+        $this->enum_type = $arr;
         $this->has_enum_type = true;
+
+        return $this;
     }
 
     public function hasEnumType()
@@ -197,7 +237,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getExtensionRange()
     {
@@ -205,13 +246,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;</code>
+     * @param \Google\Protobuf\Internal\DescriptorProto\ExtensionRange[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setExtensionRange(&$var)
+    public function setExtensionRange($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto_ExtensionRange::class);
-        $this->extension_range = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto\ExtensionRange::class);
+        $this->extension_range = $arr;
         $this->has_extension_range = true;
+
+        return $this;
     }
 
     public function hasExtensionRange()
@@ -220,7 +265,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getOneofDecl()
     {
@@ -228,13 +274,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;</code>
+     * @param \Google\Protobuf\Internal\OneofDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setOneofDecl(&$var)
+    public function setOneofDecl($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\OneofDescriptorProto::class);
-        $this->oneof_decl = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\OneofDescriptorProto::class);
+        $this->oneof_decl = $arr;
         $this->has_oneof_decl = true;
+
+        return $this;
     }
 
     public function hasOneofDecl()
@@ -243,7 +293,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MessageOptions options = 7;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MessageOptions options = 7;</code>
+     * @return \Google\Protobuf\Internal\MessageOptions
      */
     public function getOptions()
     {
@@ -251,13 +302,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MessageOptions options = 7;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MessageOptions options = 7;</code>
+     * @param \Google\Protobuf\Internal\MessageOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\MessageOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
@@ -266,7 +321,8 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getReservedRange()
     {
@@ -274,13 +330,17 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;</code>
+     * @param \Google\Protobuf\Internal\DescriptorProto\ReservedRange[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setReservedRange(&$var)
+    public function setReservedRange($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto_ReservedRange::class);
-        $this->reserved_range = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto\ReservedRange::class);
+        $this->reserved_range = $arr;
         $this->has_reserved_range = true;
+
+        return $this;
     }
 
     public function hasReservedRange()
@@ -289,12 +349,11 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Reserved field names, which may not be used by fields in the same message.
      * A given name may only be reserved once.
-     * </pre>
      *
-     * <code>repeated string reserved_name = 10;</code>
+     * Generated from protobuf field <code>repeated string reserved_name = 10;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getReservedName()
     {
@@ -302,18 +361,20 @@ class DescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Reserved field names, which may not be used by fields in the same message.
      * A given name may only be reserved once.
-     * </pre>
      *
-     * <code>repeated string reserved_name = 10;</code>
+     * Generated from protobuf field <code>repeated string reserved_name = 10;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setReservedName(&$var)
+    public function setReservedName($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
-        $this->reserved_name = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->reserved_name = $arr;
         $this->has_reserved_name = true;
+
+        return $this;
     }
 
     public function hasReservedName()
diff --git a/php/src/Google/Protobuf/Internal/DescriptorProto/ExtensionRange.php b/php/src/Google/Protobuf/Internal/DescriptorProto/ExtensionRange.php
new file mode 100644
index 00000000..c06a0a6e
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/DescriptorProto/ExtensionRange.php
@@ -0,0 +1,138 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\DescriptorProto;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\GPBWire;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\InputStream;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Generated from protobuf message <code>google.protobuf.DescriptorProto.ExtensionRange</code>
+ */
+class ExtensionRange extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     */
+    private $start = 0;
+    private $has_start = false;
+    /**
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     */
+    private $end = 0;
+    private $has_end = false;
+    /**
+     * Generated from protobuf field <code>optional .google.protobuf.ExtensionRangeOptions options = 3;</code>
+     */
+    private $options = null;
+    private $has_options = false;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $start
+     *     @type int $end
+     *     @type \Google\Protobuf\Internal\ExtensionRangeOptions $options
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @return int
+     */
+    public function getStart()
+    {
+        return $this->start;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setStart($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->start = $var;
+        $this->has_start = true;
+
+        return $this;
+    }
+
+    public function hasStart()
+    {
+        return $this->has_start;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @return int
+     */
+    public function getEnd()
+    {
+        return $this->end;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setEnd($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->end = $var;
+        $this->has_end = true;
+
+        return $this;
+    }
+
+    public function hasEnd()
+    {
+        return $this->has_end;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional .google.protobuf.ExtensionRangeOptions options = 3;</code>
+     * @return \Google\Protobuf\Internal\ExtensionRangeOptions
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional .google.protobuf.ExtensionRangeOptions options = 3;</code>
+     * @param \Google\Protobuf\Internal\ExtensionRangeOptions $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\Internal\ExtensionRangeOptions::class);
+        $this->options = $var;
+        $this->has_options = true;
+
+        return $this;
+    }
+
+    public function hasOptions()
+    {
+        return $this->has_options;
+    }
+
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(ExtensionRange::class, \Google\Protobuf\Internal\DescriptorProto_ExtensionRange::class);
+
diff --git a/php/src/Google/Protobuf/Internal/DescriptorProto_ReservedRange.php b/php/src/Google/Protobuf/Internal/DescriptorProto/ReservedRange.php
index be36b8aa..73c964fa 100644
--- a/php/src/Google/Protobuf/Internal/DescriptorProto_ReservedRange.php
+++ b/php/src/Google/Protobuf/Internal/DescriptorProto/ReservedRange.php
@@ -2,56 +2,60 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/protobuf/descriptor.proto
 
-namespace Google\Protobuf\Internal;
+namespace Google\Protobuf\Internal\DescriptorProto;
 
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Range of reserved tag numbers. Reserved tag numbers may not be used by
  * fields or extension ranges in the same message. Reserved ranges may
  * not overlap.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.DescriptorProto.ReservedRange</code>
+ * Generated from protobuf message <code>google.protobuf.DescriptorProto.ReservedRange</code>
  */
-class DescriptorProto_ReservedRange extends \Google\Protobuf\Internal\Message
+class ReservedRange extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Inclusive.
-     * </pre>
      *
-     * <code>optional int32 start = 1;</code>
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
      */
     private $start = 0;
     private $has_start = false;
     /**
-     * <pre>
      * Exclusive.
-     * </pre>
      *
-     * <code>optional int32 end = 2;</code>
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
      */
     private $end = 0;
     private $has_end = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $start
+     *           Inclusive.
+     *     @type int $end
+     *           Exclusive.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Inclusive.
-     * </pre>
      *
-     * <code>optional int32 start = 1;</code>
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @return int
      */
     public function getStart()
     {
@@ -59,17 +63,19 @@ class DescriptorProto_ReservedRange extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Inclusive.
-     * </pre>
      *
-     * <code>optional int32 start = 1;</code>
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @param int $var
+     * @return $this
      */
     public function setStart($var)
     {
         GPBUtil::checkInt32($var);
         $this->start = $var;
         $this->has_start = true;
+
+        return $this;
     }
 
     public function hasStart()
@@ -78,11 +84,10 @@ class DescriptorProto_ReservedRange extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Exclusive.
-     * </pre>
      *
-     * <code>optional int32 end = 2;</code>
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @return int
      */
     public function getEnd()
     {
@@ -90,17 +95,19 @@ class DescriptorProto_ReservedRange extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Exclusive.
-     * </pre>
      *
-     * <code>optional int32 end = 2;</code>
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @param int $var
+     * @return $this
      */
     public function setEnd($var)
     {
         GPBUtil::checkInt32($var);
         $this->end = $var;
         $this->has_end = true;
+
+        return $this;
     }
 
     public function hasEnd()
@@ -110,3 +117,6 @@ class DescriptorProto_ReservedRange extends \Google\Protobuf\Internal\Message
 
 }
 
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(ReservedRange::class, \Google\Protobuf\Internal\DescriptorProto_ReservedRange::class);
+
diff --git a/php/src/Google/Protobuf/Internal/DescriptorProto_ExtensionRange.php b/php/src/Google/Protobuf/Internal/DescriptorProto_ExtensionRange.php
deleted file mode 100644
index 738a1738..00000000
--- a/php/src/Google/Protobuf/Internal/DescriptorProto_ExtensionRange.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-namespace Google\Protobuf\Internal;
-
-use Google\Protobuf\Internal\GPBType;
-use Google\Protobuf\Internal\GPBWire;
-use Google\Protobuf\Internal\RepeatedField;
-use Google\Protobuf\Internal\InputStream;
-
-use Google\Protobuf\Internal\GPBUtil;
-
-/**
- * Protobuf type <code>google.protobuf.DescriptorProto.ExtensionRange</code>
- */
-class DescriptorProto_ExtensionRange extends \Google\Protobuf\Internal\Message
-{
-    /**
-     * <code>optional int32 start = 1;</code>
-     */
-    private $start = 0;
-    private $has_start = false;
-    /**
-     * <code>optional int32 end = 2;</code>
-     */
-    private $end = 0;
-    private $has_end = false;
-
-    public function __construct() {
-        \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
-    }
-
-    /**
-     * <code>optional int32 start = 1;</code>
-     */
-    public function getStart()
-    {
-        return $this->start;
-    }
-
-    /**
-     * <code>optional int32 start = 1;</code>
-     */
-    public function setStart($var)
-    {
-        GPBUtil::checkInt32($var);
-        $this->start = $var;
-        $this->has_start = true;
-    }
-
-    public function hasStart()
-    {
-        return $this->has_start;
-    }
-
-    /**
-     * <code>optional int32 end = 2;</code>
-     */
-    public function getEnd()
-    {
-        return $this->end;
-    }
-
-    /**
-     * <code>optional int32 end = 2;</code>
-     */
-    public function setEnd($var)
-    {
-        GPBUtil::checkInt32($var);
-        $this->end = $var;
-        $this->has_end = true;
-    }
-
-    public function hasEnd()
-    {
-        return $this->has_end;
-    }
-
-}
-
diff --git a/php/src/Google/Protobuf/Internal/EnumBuilderContext.php b/php/src/Google/Protobuf/Internal/EnumBuilderContext.php
index c1dac24d..08397284 100644
--- a/php/src/Google/Protobuf/Internal/EnumBuilderContext.php
+++ b/php/src/Google/Protobuf/Internal/EnumBuilderContext.php
@@ -33,7 +33,7 @@
 namespace Google\Protobuf\Internal;
 
 use Google\Protobuf\Internal\EnumDescriptor;
-use Google\Protobuf\Internal\EnumValueDescriptor;
+use Google\Protobuf\EnumValueDescriptor;
 
 class EnumBuilderContext
 {
@@ -51,7 +51,7 @@ class EnumBuilderContext
 
     public function value($name, $number)
     {
-        $value = new EnumValueDescriptor();
+        $value = new EnumValueDescriptor($name, $number);
         $this->descriptor->addValue($number, $value);
         return $this;
     }
diff --git a/php/src/Google/Protobuf/Internal/EnumDescriptor.php b/php/src/Google/Protobuf/Internal/EnumDescriptor.php
new file mode 100644
index 00000000..01649fec
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/EnumDescriptor.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Google\Protobuf\Internal;
+
+use Google\Protobuf\EnumValueDescriptor;
+
+class EnumDescriptor
+{
+    use HasPublicDescriptorTrait;
+
+    private $klass;
+    private $full_name;
+    private $value;
+    private $name_to_value;
+    private $value_descriptor = [];
+
+    public function __construct()
+    {
+        $this->public_desc = new \Google\Protobuf\EnumDescriptor($this);
+    }
+
+    public function setFullName($full_name)
+    {
+        $this->full_name = $full_name;
+    }
+
+    public function getFullName()
+    {
+        return $this->full_name;
+    }
+
+    public function addValue($number, $value)
+    {
+        $this->value[$number] = $value;
+        $this->name_to_value[$value->getName()] = $value;
+        $this->value_descriptor[] = new EnumValueDescriptor($value->getName(), $number);
+    }
+
+    public function getValueByNumber($number)
+    {
+        return $this->value[$number];
+    }
+
+    public function getValueByName($name)
+    {
+        return $this->name_to_value[$name];
+    }
+
+    public function getValueDescriptorByIndex($index)
+    {
+        return $this->value_descriptor[$index];
+    }
+
+    public function getValueCount()
+    {
+        return count($this->value);
+    }
+
+    public function setClass($klass)
+    {
+        $this->klass = $klass;
+    }
+
+    public function getClass()
+    {
+        return $this->klass;
+    }
+
+    public static function buildFromProto($proto, $file_proto, $containing)
+    {
+        $desc = new EnumDescriptor();
+
+        $enum_name_without_package  = "";
+        $classname = "";
+        $fullname = "";
+        GPBUtil::getFullClassName(
+            $proto,
+            $containing,
+            $file_proto,
+            $enum_name_without_package,
+            $classname,
+            $fullname);
+        $desc->setFullName($fullname);
+        $desc->setClass($classname);
+        $values = $proto->getValue();
+        foreach ($values as $value) {
+            $desc->addValue($value->getNumber(), $value);
+        }
+
+        return $desc;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/EnumDescriptorProto.php b/php/src/Google/Protobuf/Internal/EnumDescriptorProto.php
index 9c5f245b..da30fa99 100644
--- a/php/src/Google/Protobuf/Internal/EnumDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/EnumDescriptorProto.php
@@ -8,41 +8,74 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes an enum type.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.EnumDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.EnumDescriptorProto</code>
  */
 class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
      */
     private $value;
     private $has_value = false;
     /**
-     * <code>optional .google.protobuf.EnumOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumOptions options = 3;</code>
      */
     private $options = null;
     private $has_options = false;
+    /**
+     * Range of reserved numeric values. Reserved numeric values may not be used
+     * by enum values in the same enum declaration. Reserved ranges may not
+     * overlap.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;</code>
+     */
+    private $reserved_range;
+    private $has_reserved_range = false;
+    /**
+     * Reserved enum value names, which may not be reused. A given name may only
+     * be reserved once.
+     *
+     * Generated from protobuf field <code>repeated string reserved_name = 5;</code>
+     */
+    private $reserved_name;
+    private $has_reserved_name = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type \Google\Protobuf\Internal\EnumValueDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $value
+     *     @type \Google\Protobuf\Internal\EnumOptions $options
+     *     @type \Google\Protobuf\Internal\EnumDescriptorProto\EnumReservedRange[]|\Google\Protobuf\Internal\RepeatedField $reserved_range
+     *           Range of reserved numeric values. Reserved numeric values may not be used
+     *           by enum values in the same enum declaration. Reserved ranges may not
+     *           overlap.
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $reserved_name
+     *           Reserved enum value names, which may not be reused. A given name may only
+     *           be reserved once.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -50,13 +83,17 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -65,7 +102,8 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getValue()
     {
@@ -73,13 +111,17 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumValueDescriptorProto value = 2;</code>
+     * @param \Google\Protobuf\Internal\EnumValueDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setValue(&$var)
+    public function setValue($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumValueDescriptorProto::class);
-        $this->value = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumValueDescriptorProto::class);
+        $this->value = $arr;
         $this->has_value = true;
+
+        return $this;
     }
 
     public function hasValue()
@@ -88,7 +130,8 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.EnumOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumOptions options = 3;</code>
+     * @return \Google\Protobuf\Internal\EnumOptions
      */
     public function getOptions()
     {
@@ -96,13 +139,17 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.EnumOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumOptions options = 3;</code>
+     * @param \Google\Protobuf\Internal\EnumOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\EnumOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
@@ -110,5 +157,75 @@ class EnumDescriptorProto extends \Google\Protobuf\Internal\Message
         return $this->has_options;
     }
 
+    /**
+     * Range of reserved numeric values. Reserved numeric values may not be used
+     * by enum values in the same enum declaration. Reserved ranges may not
+     * overlap.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getReservedRange()
+    {
+        return $this->reserved_range;
+    }
+
+    /**
+     * Range of reserved numeric values. Reserved numeric values may not be used
+     * by enum values in the same enum declaration. Reserved ranges may not
+     * overlap.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;</code>
+     * @param \Google\Protobuf\Internal\EnumDescriptorProto\EnumReservedRange[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setReservedRange($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumDescriptorProto\EnumReservedRange::class);
+        $this->reserved_range = $arr;
+        $this->has_reserved_range = true;
+
+        return $this;
+    }
+
+    public function hasReservedRange()
+    {
+        return $this->has_reserved_range;
+    }
+
+    /**
+     * Reserved enum value names, which may not be reused. A given name may only
+     * be reserved once.
+     *
+     * Generated from protobuf field <code>repeated string reserved_name = 5;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getReservedName()
+    {
+        return $this->reserved_name;
+    }
+
+    /**
+     * Reserved enum value names, which may not be reused. A given name may only
+     * be reserved once.
+     *
+     * Generated from protobuf field <code>repeated string reserved_name = 5;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setReservedName($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->reserved_name = $arr;
+        $this->has_reserved_name = true;
+
+        return $this;
+    }
+
+    public function hasReservedName()
+    {
+        return $this->has_reserved_name;
+    }
+
 }
 
diff --git a/php/src/Google/Protobuf/Internal/EnumDescriptorProto/EnumReservedRange.php b/php/src/Google/Protobuf/Internal/EnumDescriptorProto/EnumReservedRange.php
new file mode 100644
index 00000000..e1079585
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/EnumDescriptorProto/EnumReservedRange.php
@@ -0,0 +1,124 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\EnumDescriptorProto;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\GPBWire;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\InputStream;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Range of reserved numeric values. Reserved values may not be used by
+ * entries in the same enum. Reserved ranges may not overlap.
+ * Note that this is distinct from DescriptorProto.ReservedRange in that it
+ * is inclusive such that it can appropriately represent the entire int32
+ * domain.
+ *
+ * Generated from protobuf message <code>google.protobuf.EnumDescriptorProto.EnumReservedRange</code>
+ */
+class EnumReservedRange extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     */
+    private $start = 0;
+    private $has_start = false;
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     */
+    private $end = 0;
+    private $has_end = false;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $start
+     *           Inclusive.
+     *     @type int $end
+     *           Inclusive.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @return int
+     */
+    public function getStart()
+    {
+        return $this->start;
+    }
+
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 start = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setStart($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->start = $var;
+        $this->has_start = true;
+
+        return $this;
+    }
+
+    public function hasStart()
+    {
+        return $this->has_start;
+    }
+
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @return int
+     */
+    public function getEnd()
+    {
+        return $this->end;
+    }
+
+    /**
+     * Inclusive.
+     *
+     * Generated from protobuf field <code>optional int32 end = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setEnd($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->end = $var;
+        $this->has_end = true;
+
+        return $this;
+    }
+
+    public function hasEnd()
+    {
+        return $this->has_end;
+    }
+
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(EnumReservedRange::class, \Google\Protobuf\Internal\EnumDescriptorProto_EnumReservedRange::class);
+
diff --git a/php/src/Google/Protobuf/Internal/EnumOptions.php b/php/src/Google/Protobuf/Internal/EnumOptions.php
index a9c4e0d7..3d74c81c 100644
--- a/php/src/Google/Protobuf/Internal/EnumOptions.php
+++ b/php/src/Google/Protobuf/Internal/EnumOptions.php
@@ -8,58 +8,68 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.EnumOptions</code>
+ * Generated from protobuf message <code>google.protobuf.EnumOptions</code>
  */
 class EnumOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Set this option to true to allow mapping different tag names to the same
      * value.
-     * </pre>
      *
-     * <code>optional bool allow_alias = 2;</code>
+     * Generated from protobuf field <code>optional bool allow_alias = 2;</code>
      */
     private $allow_alias = false;
     private $has_allow_alias = false;
     /**
-     * <pre>
      * Is this enum deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating enums.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $allow_alias
+     *           Set this option to true to allow mapping different tag names to the same
+     *           value.
+     *     @type bool $deprecated
+     *           Is this enum deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for the enum, or it will be completely ignored; in the very least, this
+     *           is a formalization for deprecating enums.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Set this option to true to allow mapping different tag names to the same
      * value.
-     * </pre>
      *
-     * <code>optional bool allow_alias = 2;</code>
+     * Generated from protobuf field <code>optional bool allow_alias = 2;</code>
+     * @return bool
      */
     public function getAllowAlias()
     {
@@ -67,18 +77,20 @@ class EnumOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Set this option to true to allow mapping different tag names to the same
      * value.
-     * </pre>
      *
-     * <code>optional bool allow_alias = 2;</code>
+     * Generated from protobuf field <code>optional bool allow_alias = 2;</code>
+     * @param bool $var
+     * @return $this
      */
     public function setAllowAlias($var)
     {
         GPBUtil::checkBool($var);
         $this->allow_alias = $var;
         $this->has_allow_alias = true;
+
+        return $this;
     }
 
     public function hasAllowAlias()
@@ -87,14 +99,13 @@ class EnumOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this enum deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating enums.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -102,20 +113,22 @@ class EnumOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this enum deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating enums.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -124,11 +137,10 @@ class EnumOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -136,17 +148,19 @@ class EnumOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php b/php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php
index 94dc36ec..50bda008 100644
--- a/php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/EnumValueDescriptorProto.php
@@ -8,41 +8,50 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a value within an enum.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.EnumValueDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.EnumValueDescriptorProto</code>
  */
 class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>optional int32 number = 2;</code>
+     * Generated from protobuf field <code>optional int32 number = 2;</code>
      */
     private $number = 0;
     private $has_number = false;
     /**
-     * <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
      */
     private $options = null;
     private $has_options = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type int $number
+     *     @type \Google\Protobuf\Internal\EnumValueOptions $options
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -50,13 +59,17 @@ class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -65,7 +78,8 @@ class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int32 number = 2;</code>
+     * Generated from protobuf field <code>optional int32 number = 2;</code>
+     * @return int
      */
     public function getNumber()
     {
@@ -73,13 +87,17 @@ class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int32 number = 2;</code>
+     * Generated from protobuf field <code>optional int32 number = 2;</code>
+     * @param int $var
+     * @return $this
      */
     public function setNumber($var)
     {
         GPBUtil::checkInt32($var);
         $this->number = $var;
         $this->has_number = true;
+
+        return $this;
     }
 
     public function hasNumber()
@@ -88,7 +106,8 @@ class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
+     * @return \Google\Protobuf\Internal\EnumValueOptions
      */
     public function getOptions()
     {
@@ -96,13 +115,17 @@ class EnumValueDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.EnumValueOptions options = 3;</code>
+     * @param \Google\Protobuf\Internal\EnumValueOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\EnumValueOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
diff --git a/php/src/Google/Protobuf/Internal/EnumValueOptions.php b/php/src/Google/Protobuf/Internal/EnumValueOptions.php
index 6446ecd4..a267c6d5 100644
--- a/php/src/Google/Protobuf/Internal/EnumValueOptions.php
+++ b/php/src/Google/Protobuf/Internal/EnumValueOptions.php
@@ -8,50 +8,59 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.EnumValueOptions</code>
+ * Generated from protobuf message <code>google.protobuf.EnumValueOptions</code>
  */
 class EnumValueOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Is this enum value deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum value, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating enum values.
-     * </pre>
      *
-     * <code>optional bool deprecated = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 1 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $deprecated
+     *           Is this enum value deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for the enum value, or it will be completely ignored; in the very least,
+     *           this is a formalization for deprecating enum values.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Is this enum value deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum value, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating enum values.
-     * </pre>
      *
-     * <code>optional bool deprecated = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 1 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -59,20 +68,22 @@ class EnumValueOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this enum value deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the enum value, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating enum values.
-     * </pre>
      *
-     * <code>optional bool deprecated = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 1 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -81,11 +92,10 @@ class EnumValueOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -93,17 +103,19 @@ class EnumValueOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/ExtensionRangeOptions.php b/php/src/Google/Protobuf/Internal/ExtensionRangeOptions.php
new file mode 100644
index 00000000..00fbebec
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/ExtensionRangeOptions.php
@@ -0,0 +1,74 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\GPBWire;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\InputStream;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Generated from protobuf message <code>google.protobuf.ExtensionRangeOptions</code>
+ */
+class ExtensionRangeOptions extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The parser stores options it doesn't recognize here. See above.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     */
+    private $uninterpreted_option;
+    private $has_uninterpreted_option = false;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The parser stores options it doesn't recognize here. See above.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getUninterpretedOption()
+    {
+        return $this->uninterpreted_option;
+    }
+
+    /**
+     * The parser stores options it doesn't recognize here. See above.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setUninterpretedOption($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
+        $this->has_uninterpreted_option = true;
+
+        return $this;
+    }
+
+    public function hasUninterpretedOption()
+    {
+        return $this->has_uninterpreted_option;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptor.php b/php/src/Google/Protobuf/Internal/FieldDescriptor.php
new file mode 100644
index 00000000..6644a2e0
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FieldDescriptor.php
@@ -0,0 +1,265 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class FieldDescriptor
+{
+    use HasPublicDescriptorTrait;
+
+    private $name;
+    private $json_name;
+    private $setter;
+    private $getter;
+    private $number;
+    private $label;
+    private $type;
+    private $message_type;
+    private $enum_type;
+    private $packed;
+    private $is_map;
+    private $oneof_index = -1;
+
+    public function __construct()
+    {
+        $this->public_desc = new \Google\Protobuf\FieldDescriptor($this);
+    }
+
+    public function setOneofIndex($index)
+    {
+        $this->oneof_index = $index;
+    }
+
+    public function getOneofIndex()
+    {
+        return $this->oneof_index;
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function setJsonName($json_name)
+    {
+        $this->json_name = $json_name;
+    }
+
+    public function getJsonName()
+    {
+        return $this->json_name;
+    }
+
+    public function setSetter($setter)
+    {
+        $this->setter = $setter;
+    }
+
+    public function getSetter()
+    {
+        return $this->setter;
+    }
+
+    public function setGetter($getter)
+    {
+        $this->getter = $getter;
+    }
+
+    public function getGetter()
+    {
+        return $this->getter;
+    }
+
+    public function setNumber($number)
+    {
+        $this->number = $number;
+    }
+
+    public function getNumber()
+    {
+        return $this->number;
+    }
+
+    public function setLabel($label)
+    {
+        $this->label = $label;
+    }
+
+    public function getLabel()
+    {
+        return $this->label;
+    }
+
+    public function isRepeated()
+    {
+        return $this->label === GPBLabel::REPEATED;
+    }
+
+    public function setType($type)
+    {
+        $this->type = $type;
+    }
+
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    public function setMessageType($message_type)
+    {
+        $this->message_type = $message_type;
+    }
+
+    public function getMessageType()
+    {
+        return $this->message_type;
+    }
+
+    public function setEnumType($enum_type)
+    {
+        $this->enum_type = $enum_type;
+    }
+
+    public function getEnumType()
+    {
+        return $this->enum_type;
+    }
+
+    public function setPacked($packed)
+    {
+        $this->packed = $packed;
+    }
+
+    public function getPacked()
+    {
+        return $this->packed;
+    }
+
+    public function isPackable()
+    {
+        return $this->isRepeated() && self::isTypePackable($this->type);
+    }
+
+    public function isMap()
+    {
+        return $this->getType() == GPBType::MESSAGE &&
+               !is_null($this->getMessageType()->getOptions()) &&
+               $this->getMessageType()->getOptions()->getMapEntry();
+    }
+
+    public function isTimestamp()
+    {
+        return $this->getType() == GPBType::MESSAGE &&
+            $this->getMessageType()->getClass() === "Google\Protobuf\Timestamp";
+    }
+
+    private static function isTypePackable($field_type)
+    {
+        return ($field_type !== GPBType::STRING  &&
+            $field_type !== GPBType::GROUP   &&
+            $field_type !== GPBType::MESSAGE &&
+            $field_type !== GPBType::BYTES);
+    }
+
+    public static function getFieldDescriptor($proto)
+    {
+        $type_name = null;
+        $type = $proto->getType();
+        switch ($type) {
+            case GPBType::MESSAGE:
+            case GPBType::GROUP:
+            case GPBType::ENUM:
+                $type_name = $proto->getTypeName();
+                break;
+            default:
+                break;
+        }
+
+        $oneof_index = $proto->hasOneofIndex() ? $proto->getOneofIndex() : -1;
+        $packed = false;
+        $options = $proto->getOptions();
+        if ($options !== null) {
+            $packed = $options->getPacked();
+        }
+
+        $field = new FieldDescriptor();
+        $field->setName($proto->getName());
+
+        $json_name = $proto->hasJsonName() ? $proto->getJsonName() :
+            lcfirst(implode('', array_map('ucwords', explode('_', $proto->getName()))));
+        if ($proto->hasJsonName()) {
+            $json_name = $proto->getJsonName();
+        } else {
+            $proto_name = $proto->getName();
+            $json_name = implode('', array_map('ucwords', explode('_', $proto_name)));
+            if ($proto_name[0] !== "_" && !ctype_upper($proto_name[0])) {
+                $json_name = lcfirst($json_name);
+            }
+        }
+        $field->setJsonName($json_name);
+
+        $camel_name = implode('', array_map('ucwords', explode('_', $proto->getName())));
+        $field->setGetter('get' . $camel_name);
+        $field->setSetter('set' . $camel_name);
+        $field->setType($proto->getType());
+        $field->setNumber($proto->getNumber());
+        $field->setLabel($proto->getLabel());
+        $field->setPacked($packed);
+        $field->setOneofIndex($oneof_index);
+
+        // At this time, the message/enum type may have not been added to pool.
+        // So we use the type name as place holder and will replace it with the
+        // actual descriptor in cross building.
+        switch ($type) {
+            case GPBType::MESSAGE:
+                $field->setMessageType($type_name);
+                break;
+            case GPBType::ENUM:
+                $field->setEnumType($type_name);
+                break;
+            default:
+                break;
+        }
+
+        return $field;
+    }
+
+    public static function buildFromProto($proto)
+    {
+        return FieldDescriptor::getFieldDescriptor($proto);
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptorProto.php b/php/src/Google/Protobuf/Internal/FieldDescriptorProto.php
index 6ae2cd41..e5781975 100644
--- a/php/src/Google/Protobuf/Internal/FieldDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/FieldDescriptorProto.php
@@ -8,114 +8,138 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a field within a message.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.FieldDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.FieldDescriptorProto</code>
  */
 class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>optional int32 number = 3;</code>
+     * Generated from protobuf field <code>optional int32 number = 3;</code>
      */
     private $number = 0;
     private $has_number = false;
     /**
-     * <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
      */
     private $label = 0;
     private $has_label = false;
     /**
-     * <pre>
      * If type_name is set, this need not be set.  If both this and type_name
      * are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
      */
     private $type = 0;
     private $has_type = false;
     /**
-     * <pre>
      * For message and enum types, this is the name of the type.  If the name
      * starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
      * rules are used to find the type (i.e. first the nested types within this
      * message are searched, then within the parent, on up to the root
      * namespace).
-     * </pre>
      *
-     * <code>optional string type_name = 6;</code>
+     * Generated from protobuf field <code>optional string type_name = 6;</code>
      */
     private $type_name = '';
     private $has_type_name = false;
     /**
-     * <pre>
      * For extensions, this is the name of the type being extended.  It is
      * resolved in the same manner as type_name.
-     * </pre>
      *
-     * <code>optional string extendee = 2;</code>
+     * Generated from protobuf field <code>optional string extendee = 2;</code>
      */
     private $extendee = '';
     private $has_extendee = false;
     /**
-     * <pre>
      * For numeric types, contains the original text representation of the value.
      * For booleans, "true" or "false".
      * For strings, contains the default text contents (not escaped in any way).
-     * For bytes, contains the C escaped value.  All bytes &gt;= 128 are escaped.
+     * For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
      * TODO(kenton):  Base-64 encode?
-     * </pre>
      *
-     * <code>optional string default_value = 7;</code>
+     * Generated from protobuf field <code>optional string default_value = 7;</code>
      */
     private $default_value = '';
     private $has_default_value = false;
     /**
-     * <pre>
      * If set, gives the index of a oneof in the containing type's oneof_decl
      * list.  This field is a member of that oneof.
-     * </pre>
      *
-     * <code>optional int32 oneof_index = 9;</code>
+     * Generated from protobuf field <code>optional int32 oneof_index = 9;</code>
      */
     private $oneof_index = 0;
     private $has_oneof_index = false;
     /**
-     * <pre>
      * JSON name of this field. The value is set by protocol compiler. If the
      * user has set a "json_name" option on this field, that option's value
      * will be used. Otherwise, it's deduced from the field's name by converting
      * it to camelCase.
-     * </pre>
      *
-     * <code>optional string json_name = 10;</code>
+     * Generated from protobuf field <code>optional string json_name = 10;</code>
      */
     private $json_name = '';
     private $has_json_name = false;
     /**
-     * <code>optional .google.protobuf.FieldOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions options = 8;</code>
      */
     private $options = null;
     private $has_options = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type int $number
+     *     @type int $label
+     *     @type int $type
+     *           If type_name is set, this need not be set.  If both this and type_name
+     *           are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
+     *     @type string $type_name
+     *           For message and enum types, this is the name of the type.  If the name
+     *           starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
+     *           rules are used to find the type (i.e. first the nested types within this
+     *           message are searched, then within the parent, on up to the root
+     *           namespace).
+     *     @type string $extendee
+     *           For extensions, this is the name of the type being extended.  It is
+     *           resolved in the same manner as type_name.
+     *     @type string $default_value
+     *           For numeric types, contains the original text representation of the value.
+     *           For booleans, "true" or "false".
+     *           For strings, contains the default text contents (not escaped in any way).
+     *           For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
+     *           TODO(kenton):  Base-64 encode?
+     *     @type int $oneof_index
+     *           If set, gives the index of a oneof in the containing type's oneof_decl
+     *           list.  This field is a member of that oneof.
+     *     @type string $json_name
+     *           JSON name of this field. The value is set by protocol compiler. If the
+     *           user has set a "json_name" option on this field, that option's value
+     *           will be used. Otherwise, it's deduced from the field's name by converting
+     *           it to camelCase.
+     *     @type \Google\Protobuf\Internal\FieldOptions $options
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -123,13 +147,17 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -138,7 +166,8 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int32 number = 3;</code>
+     * Generated from protobuf field <code>optional int32 number = 3;</code>
+     * @return int
      */
     public function getNumber()
     {
@@ -146,13 +175,17 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int32 number = 3;</code>
+     * Generated from protobuf field <code>optional int32 number = 3;</code>
+     * @param int $var
+     * @return $this
      */
     public function setNumber($var)
     {
         GPBUtil::checkInt32($var);
         $this->number = $var;
         $this->has_number = true;
+
+        return $this;
     }
 
     public function hasNumber()
@@ -161,7 +194,8 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
+     * @return int
      */
     public function getLabel()
     {
@@ -169,13 +203,17 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Label label = 4;</code>
+     * @param int $var
+     * @return $this
      */
     public function setLabel($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\FieldDescriptorProto_Label::class);
         $this->label = $var;
         $this->has_label = true;
+
+        return $this;
     }
 
     public function hasLabel()
@@ -184,12 +222,11 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If type_name is set, this need not be set.  If both this and type_name
      * are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
+     * @return int
      */
     public function getType()
     {
@@ -197,18 +234,20 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If type_name is set, this need not be set.  If both this and type_name
      * are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldDescriptorProto.Type type = 5;</code>
+     * @param int $var
+     * @return $this
      */
     public function setType($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\FieldDescriptorProto_Type::class);
         $this->type = $var;
         $this->has_type = true;
+
+        return $this;
     }
 
     public function hasType()
@@ -217,15 +256,14 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For message and enum types, this is the name of the type.  If the name
      * starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
      * rules are used to find the type (i.e. first the nested types within this
      * message are searched, then within the parent, on up to the root
      * namespace).
-     * </pre>
      *
-     * <code>optional string type_name = 6;</code>
+     * Generated from protobuf field <code>optional string type_name = 6;</code>
+     * @return string
      */
     public function getTypeName()
     {
@@ -233,21 +271,23 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For message and enum types, this is the name of the type.  If the name
      * starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
      * rules are used to find the type (i.e. first the nested types within this
      * message are searched, then within the parent, on up to the root
      * namespace).
-     * </pre>
      *
-     * <code>optional string type_name = 6;</code>
+     * Generated from protobuf field <code>optional string type_name = 6;</code>
+     * @param string $var
+     * @return $this
      */
     public function setTypeName($var)
     {
         GPBUtil::checkString($var, True);
         $this->type_name = $var;
         $this->has_type_name = true;
+
+        return $this;
     }
 
     public function hasTypeName()
@@ -256,12 +296,11 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For extensions, this is the name of the type being extended.  It is
      * resolved in the same manner as type_name.
-     * </pre>
      *
-     * <code>optional string extendee = 2;</code>
+     * Generated from protobuf field <code>optional string extendee = 2;</code>
+     * @return string
      */
     public function getExtendee()
     {
@@ -269,18 +308,20 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For extensions, this is the name of the type being extended.  It is
      * resolved in the same manner as type_name.
-     * </pre>
      *
-     * <code>optional string extendee = 2;</code>
+     * Generated from protobuf field <code>optional string extendee = 2;</code>
+     * @param string $var
+     * @return $this
      */
     public function setExtendee($var)
     {
         GPBUtil::checkString($var, True);
         $this->extendee = $var;
         $this->has_extendee = true;
+
+        return $this;
     }
 
     public function hasExtendee()
@@ -289,15 +330,14 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For numeric types, contains the original text representation of the value.
      * For booleans, "true" or "false".
      * For strings, contains the default text contents (not escaped in any way).
-     * For bytes, contains the C escaped value.  All bytes &gt;= 128 are escaped.
+     * For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
      * TODO(kenton):  Base-64 encode?
-     * </pre>
      *
-     * <code>optional string default_value = 7;</code>
+     * Generated from protobuf field <code>optional string default_value = 7;</code>
+     * @return string
      */
     public function getDefaultValue()
     {
@@ -305,21 +345,23 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For numeric types, contains the original text representation of the value.
      * For booleans, "true" or "false".
      * For strings, contains the default text contents (not escaped in any way).
-     * For bytes, contains the C escaped value.  All bytes &gt;= 128 are escaped.
+     * For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
      * TODO(kenton):  Base-64 encode?
-     * </pre>
      *
-     * <code>optional string default_value = 7;</code>
+     * Generated from protobuf field <code>optional string default_value = 7;</code>
+     * @param string $var
+     * @return $this
      */
     public function setDefaultValue($var)
     {
         GPBUtil::checkString($var, True);
         $this->default_value = $var;
         $this->has_default_value = true;
+
+        return $this;
     }
 
     public function hasDefaultValue()
@@ -328,12 +370,11 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set, gives the index of a oneof in the containing type's oneof_decl
      * list.  This field is a member of that oneof.
-     * </pre>
      *
-     * <code>optional int32 oneof_index = 9;</code>
+     * Generated from protobuf field <code>optional int32 oneof_index = 9;</code>
+     * @return int
      */
     public function getOneofIndex()
     {
@@ -341,18 +382,20 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set, gives the index of a oneof in the containing type's oneof_decl
      * list.  This field is a member of that oneof.
-     * </pre>
      *
-     * <code>optional int32 oneof_index = 9;</code>
+     * Generated from protobuf field <code>optional int32 oneof_index = 9;</code>
+     * @param int $var
+     * @return $this
      */
     public function setOneofIndex($var)
     {
         GPBUtil::checkInt32($var);
         $this->oneof_index = $var;
         $this->has_oneof_index = true;
+
+        return $this;
     }
 
     public function hasOneofIndex()
@@ -361,14 +404,13 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * JSON name of this field. The value is set by protocol compiler. If the
      * user has set a "json_name" option on this field, that option's value
      * will be used. Otherwise, it's deduced from the field's name by converting
      * it to camelCase.
-     * </pre>
      *
-     * <code>optional string json_name = 10;</code>
+     * Generated from protobuf field <code>optional string json_name = 10;</code>
+     * @return string
      */
     public function getJsonName()
     {
@@ -376,20 +418,22 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * JSON name of this field. The value is set by protocol compiler. If the
      * user has set a "json_name" option on this field, that option's value
      * will be used. Otherwise, it's deduced from the field's name by converting
      * it to camelCase.
-     * </pre>
      *
-     * <code>optional string json_name = 10;</code>
+     * Generated from protobuf field <code>optional string json_name = 10;</code>
+     * @param string $var
+     * @return $this
      */
     public function setJsonName($var)
     {
         GPBUtil::checkString($var, True);
         $this->json_name = $var;
         $this->has_json_name = true;
+
+        return $this;
     }
 
     public function hasJsonName()
@@ -398,7 +442,8 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FieldOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions options = 8;</code>
+     * @return \Google\Protobuf\Internal\FieldOptions
      */
     public function getOptions()
     {
@@ -406,13 +451,17 @@ class FieldDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FieldOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions options = 8;</code>
+     * @param \Google\Protobuf\Internal\FieldOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\FieldOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Label.php b/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Label.php
new file mode 100644
index 00000000..b105088e
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Label.php
@@ -0,0 +1,30 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\FieldDescriptorProto;
+
+/**
+ * Protobuf type <code>google.protobuf.FieldDescriptorProto.Label</code>
+ */
+class Label
+{
+    /**
+     * 0 is reserved for errors
+     *
+     * Generated from protobuf enum <code>LABEL_OPTIONAL = 1;</code>
+     */
+    const LABEL_OPTIONAL = 1;
+    /**
+     * Generated from protobuf enum <code>LABEL_REQUIRED = 2;</code>
+     */
+    const LABEL_REQUIRED = 2;
+    /**
+     * Generated from protobuf enum <code>LABEL_REPEATED = 3;</code>
+     */
+    const LABEL_REPEATED = 3;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Label::class, \Google\Protobuf\Internal\FieldDescriptorProto_Label::class);
+
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Type.php b/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Type.php
new file mode 100644
index 00000000..ea228a77
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FieldDescriptorProto/Type.php
@@ -0,0 +1,110 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\FieldDescriptorProto;
+
+/**
+ * Protobuf type <code>google.protobuf.FieldDescriptorProto.Type</code>
+ */
+class Type
+{
+    /**
+     * 0 is reserved for errors.
+     * Order is weird for historical reasons.
+     *
+     * Generated from protobuf enum <code>TYPE_DOUBLE = 1;</code>
+     */
+    const TYPE_DOUBLE = 1;
+    /**
+     * Generated from protobuf enum <code>TYPE_FLOAT = 2;</code>
+     */
+    const TYPE_FLOAT = 2;
+    /**
+     * Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
+     * negative values are likely.
+     *
+     * Generated from protobuf enum <code>TYPE_INT64 = 3;</code>
+     */
+    const TYPE_INT64 = 3;
+    /**
+     * Generated from protobuf enum <code>TYPE_UINT64 = 4;</code>
+     */
+    const TYPE_UINT64 = 4;
+    /**
+     * Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
+     * negative values are likely.
+     *
+     * Generated from protobuf enum <code>TYPE_INT32 = 5;</code>
+     */
+    const TYPE_INT32 = 5;
+    /**
+     * Generated from protobuf enum <code>TYPE_FIXED64 = 6;</code>
+     */
+    const TYPE_FIXED64 = 6;
+    /**
+     * Generated from protobuf enum <code>TYPE_FIXED32 = 7;</code>
+     */
+    const TYPE_FIXED32 = 7;
+    /**
+     * Generated from protobuf enum <code>TYPE_BOOL = 8;</code>
+     */
+    const TYPE_BOOL = 8;
+    /**
+     * Generated from protobuf enum <code>TYPE_STRING = 9;</code>
+     */
+    const TYPE_STRING = 9;
+    /**
+     * Tag-delimited aggregate.
+     * Group type is deprecated and not supported in proto3. However, Proto3
+     * implementations should still be able to parse the group wire format and
+     * treat group fields as unknown fields.
+     *
+     * Generated from protobuf enum <code>TYPE_GROUP = 10;</code>
+     */
+    const TYPE_GROUP = 10;
+    /**
+     * Length-delimited aggregate.
+     *
+     * Generated from protobuf enum <code>TYPE_MESSAGE = 11;</code>
+     */
+    const TYPE_MESSAGE = 11;
+    /**
+     * New in version 2.
+     *
+     * Generated from protobuf enum <code>TYPE_BYTES = 12;</code>
+     */
+    const TYPE_BYTES = 12;
+    /**
+     * Generated from protobuf enum <code>TYPE_UINT32 = 13;</code>
+     */
+    const TYPE_UINT32 = 13;
+    /**
+     * Generated from protobuf enum <code>TYPE_ENUM = 14;</code>
+     */
+    const TYPE_ENUM = 14;
+    /**
+     * Generated from protobuf enum <code>TYPE_SFIXED32 = 15;</code>
+     */
+    const TYPE_SFIXED32 = 15;
+    /**
+     * Generated from protobuf enum <code>TYPE_SFIXED64 = 16;</code>
+     */
+    const TYPE_SFIXED64 = 16;
+    /**
+     * Uses ZigZag encoding.
+     *
+     * Generated from protobuf enum <code>TYPE_SINT32 = 17;</code>
+     */
+    const TYPE_SINT32 = 17;
+    /**
+     * Uses ZigZag encoding.
+     *
+     * Generated from protobuf enum <code>TYPE_SINT64 = 18;</code>
+     */
+    const TYPE_SINT64 = 18;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Type::class, \Google\Protobuf\Internal\FieldDescriptorProto_Type::class);
+
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Label.php b/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Label.php
deleted file mode 100644
index 06f26015..00000000
--- a/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Label.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * Protobuf enum <code>google.protobuf.FieldDescriptorProto.Label</code>
- */
-namespace Google\Protobuf\Internal;
-
-class FieldDescriptorProto_Label
-{
-    /**
-     * <pre>
-     * 0 is reserved for errors
-     * </pre>
-     *
-     * <code>LABEL_OPTIONAL = 1;</code>
-     */
-    const LABEL_OPTIONAL = 1;
-    /**
-     * <code>LABEL_REQUIRED = 2;</code>
-     */
-    const LABEL_REQUIRED = 2;
-    /**
-     * <code>LABEL_REPEATED = 3;</code>
-     */
-    const LABEL_REPEATED = 3;
-}
-
diff --git a/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Type.php b/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Type.php
deleted file mode 100644
index 9bda76c2..00000000
--- a/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Type.php
+++ /dev/null
@@ -1,120 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * Protobuf enum <code>google.protobuf.FieldDescriptorProto.Type</code>
- */
-namespace Google\Protobuf\Internal;
-
-class FieldDescriptorProto_Type
-{
-    /**
-     * <pre>
-     * 0 is reserved for errors.
-     * Order is weird for historical reasons.
-     * </pre>
-     *
-     * <code>TYPE_DOUBLE = 1;</code>
-     */
-    const TYPE_DOUBLE = 1;
-    /**
-     * <code>TYPE_FLOAT = 2;</code>
-     */
-    const TYPE_FLOAT = 2;
-    /**
-     * <pre>
-     * Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
-     * negative values are likely.
-     * </pre>
-     *
-     * <code>TYPE_INT64 = 3;</code>
-     */
-    const TYPE_INT64 = 3;
-    /**
-     * <code>TYPE_UINT64 = 4;</code>
-     */
-    const TYPE_UINT64 = 4;
-    /**
-     * <pre>
-     * Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
-     * negative values are likely.
-     * </pre>
-     *
-     * <code>TYPE_INT32 = 5;</code>
-     */
-    const TYPE_INT32 = 5;
-    /**
-     * <code>TYPE_FIXED64 = 6;</code>
-     */
-    const TYPE_FIXED64 = 6;
-    /**
-     * <code>TYPE_FIXED32 = 7;</code>
-     */
-    const TYPE_FIXED32 = 7;
-    /**
-     * <code>TYPE_BOOL = 8;</code>
-     */
-    const TYPE_BOOL = 8;
-    /**
-     * <code>TYPE_STRING = 9;</code>
-     */
-    const TYPE_STRING = 9;
-    /**
-     * <pre>
-     * Tag-delimited aggregate.
-     * </pre>
-     *
-     * <code>TYPE_GROUP = 10;</code>
-     */
-    const TYPE_GROUP = 10;
-    /**
-     * <pre>
-     * Length-delimited aggregate.
-     * </pre>
-     *
-     * <code>TYPE_MESSAGE = 11;</code>
-     */
-    const TYPE_MESSAGE = 11;
-    /**
-     * <pre>
-     * New in version 2.
-     * </pre>
-     *
-     * <code>TYPE_BYTES = 12;</code>
-     */
-    const TYPE_BYTES = 12;
-    /**
-     * <code>TYPE_UINT32 = 13;</code>
-     */
-    const TYPE_UINT32 = 13;
-    /**
-     * <code>TYPE_ENUM = 14;</code>
-     */
-    const TYPE_ENUM = 14;
-    /**
-     * <code>TYPE_SFIXED32 = 15;</code>
-     */
-    const TYPE_SFIXED32 = 15;
-    /**
-     * <code>TYPE_SFIXED64 = 16;</code>
-     */
-    const TYPE_SFIXED64 = 16;
-    /**
-     * <pre>
-     * Uses ZigZag encoding.
-     * </pre>
-     *
-     * <code>TYPE_SINT32 = 17;</code>
-     */
-    const TYPE_SINT32 = 17;
-    /**
-     * <pre>
-     * Uses ZigZag encoding.
-     * </pre>
-     *
-     * <code>TYPE_SINT64 = 18;</code>
-     */
-    const TYPE_SINT64 = 18;
-}
-
diff --git a/php/src/Google/Protobuf/Internal/FieldOptions.php b/php/src/Google/Protobuf/Internal/FieldOptions.php
index af1393a5..751c278d 100644
--- a/php/src/Google/Protobuf/Internal/FieldOptions.php
+++ b/php/src/Google/Protobuf/Internal/FieldOptions.php
@@ -8,58 +8,51 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.FieldOptions</code>
+ * Generated from protobuf message <code>google.protobuf.FieldOptions</code>
  */
 class FieldOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * The ctype option instructs the C++ code generator to use a different
      * representation of the field than it normally would.  See the specific
      * options below.  This option is not yet implemented in the open source
      * release -- sorry, we'll try to include it in a future version!
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
      */
     private $ctype = 0;
     private $has_ctype = false;
     /**
-     * <pre>
      * The packed option can be enabled for repeated primitive fields to enable
      * a more efficient representation on the wire. Rather than repeatedly
      * writing the tag and type for each element, the entire array is encoded as
      * a single length-delimited blob. In proto3, only explicit setting it to
      * false will avoid using packed encoding.
-     * </pre>
      *
-     * <code>optional bool packed = 2;</code>
+     * Generated from protobuf field <code>optional bool packed = 2;</code>
      */
     private $packed = false;
     private $has_packed = false;
     /**
-     * <pre>
      * The jstype option determines the JavaScript type used for values of the
      * field.  The option is permitted only for 64 bit integral and fixed types
-     * (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-     * represented as JavaScript strings.  This avoids loss of precision that can
-     * happen when a large value is converted to a floating point JavaScript
-     * numbers.  Specifying JS_NUMBER for the jstype causes the generated
-     * JavaScript code to use the JavaScript "number" type instead of strings.
-     * This option is an enum to permit additional types to be added,
-     * e.g. goog.math.Integer.
-     * </pre>
+     * (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+     * is represented as JavaScript string, which avoids loss of precision that
+     * can happen when a large value is converted to a floating point JavaScript.
+     * Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+     * use the JavaScript "number" type.  The behavior of the default option
+     * JS_NORMAL is implementation dependent.
+     * This option is an enum to permit additional types to be added, e.g.
+     * goog.math.Integer.
      *
-     * <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
      */
     private $jstype = 0;
     private $has_jstype = false;
     /**
-     * <pre>
      * Should this field be parsed lazily?  Lazy applies only to message-type
      * fields.  It means that when the outer message is initially parsed, the
      * inner message's contents will not be parsed but instead stored in encoded
@@ -84,57 +77,113 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
      * implementation must either *always* check its required fields, or *never*
      * check its required fields, regardless of whether or not the message has
      * been parsed.
-     * </pre>
      *
-     * <code>optional bool lazy = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool lazy = 5 [default = false];</code>
      */
     private $lazy = false;
     private $has_lazy = false;
     /**
-     * <pre>
      * Is this field deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for accessors, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating fields.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>optional bool weak = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool weak = 10 [default = false];</code>
      */
     private $weak = false;
     private $has_weak = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $ctype
+     *           The ctype option instructs the C++ code generator to use a different
+     *           representation of the field than it normally would.  See the specific
+     *           options below.  This option is not yet implemented in the open source
+     *           release -- sorry, we'll try to include it in a future version!
+     *     @type bool $packed
+     *           The packed option can be enabled for repeated primitive fields to enable
+     *           a more efficient representation on the wire. Rather than repeatedly
+     *           writing the tag and type for each element, the entire array is encoded as
+     *           a single length-delimited blob. In proto3, only explicit setting it to
+     *           false will avoid using packed encoding.
+     *     @type int $jstype
+     *           The jstype option determines the JavaScript type used for values of the
+     *           field.  The option is permitted only for 64 bit integral and fixed types
+     *           (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+     *           is represented as JavaScript string, which avoids loss of precision that
+     *           can happen when a large value is converted to a floating point JavaScript.
+     *           Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+     *           use the JavaScript "number" type.  The behavior of the default option
+     *           JS_NORMAL is implementation dependent.
+     *           This option is an enum to permit additional types to be added, e.g.
+     *           goog.math.Integer.
+     *     @type bool $lazy
+     *           Should this field be parsed lazily?  Lazy applies only to message-type
+     *           fields.  It means that when the outer message is initially parsed, the
+     *           inner message's contents will not be parsed but instead stored in encoded
+     *           form.  The inner message will actually be parsed when it is first accessed.
+     *           This is only a hint.  Implementations are free to choose whether to use
+     *           eager or lazy parsing regardless of the value of this option.  However,
+     *           setting this option true suggests that the protocol author believes that
+     *           using lazy parsing on this field is worth the additional bookkeeping
+     *           overhead typically needed to implement it.
+     *           This option does not affect the public interface of any generated code;
+     *           all method signatures remain the same.  Furthermore, thread-safety of the
+     *           interface is not affected by this option; const methods remain safe to
+     *           call from multiple threads concurrently, while non-const methods continue
+     *           to require exclusive access.
+     *           Note that implementations may choose not to check required fields within
+     *           a lazy sub-message.  That is, calling IsInitialized() on the outer message
+     *           may return true even if the inner message has missing required fields.
+     *           This is necessary because otherwise the inner message would have to be
+     *           parsed in order to perform the check, defeating the purpose of lazy
+     *           parsing.  An implementation which chooses not to check required fields
+     *           must be consistent about it.  That is, for any particular sub-message, the
+     *           implementation must either *always* check its required fields, or *never*
+     *           check its required fields, regardless of whether or not the message has
+     *           been parsed.
+     *     @type bool $deprecated
+     *           Is this field deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for accessors, or it will be completely ignored; in the very least, this
+     *           is a formalization for deprecating fields.
+     *     @type bool $weak
+     *           For Google-internal migration only. Do not use.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * The ctype option instructs the C++ code generator to use a different
      * representation of the field than it normally would.  See the specific
      * options below.  This option is not yet implemented in the open source
      * release -- sorry, we'll try to include it in a future version!
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
+     * @return int
      */
     public function getCtype()
     {
@@ -142,20 +191,22 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The ctype option instructs the C++ code generator to use a different
      * representation of the field than it normally would.  See the specific
      * options below.  This option is not yet implemented in the open source
      * release -- sorry, we'll try to include it in a future version!
-     * </pre>
      *
-     * <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];</code>
+     * @param int $var
+     * @return $this
      */
     public function setCtype($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\FieldOptions_CType::class);
         $this->ctype = $var;
         $this->has_ctype = true;
+
+        return $this;
     }
 
     public function hasCtype()
@@ -164,15 +215,14 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The packed option can be enabled for repeated primitive fields to enable
      * a more efficient representation on the wire. Rather than repeatedly
      * writing the tag and type for each element, the entire array is encoded as
      * a single length-delimited blob. In proto3, only explicit setting it to
      * false will avoid using packed encoding.
-     * </pre>
      *
-     * <code>optional bool packed = 2;</code>
+     * Generated from protobuf field <code>optional bool packed = 2;</code>
+     * @return bool
      */
     public function getPacked()
     {
@@ -180,21 +230,23 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The packed option can be enabled for repeated primitive fields to enable
      * a more efficient representation on the wire. Rather than repeatedly
      * writing the tag and type for each element, the entire array is encoded as
      * a single length-delimited blob. In proto3, only explicit setting it to
      * false will avoid using packed encoding.
-     * </pre>
      *
-     * <code>optional bool packed = 2;</code>
+     * Generated from protobuf field <code>optional bool packed = 2;</code>
+     * @param bool $var
+     * @return $this
      */
     public function setPacked($var)
     {
         GPBUtil::checkBool($var);
         $this->packed = $var;
         $this->has_packed = true;
+
+        return $this;
     }
 
     public function hasPacked()
@@ -203,19 +255,19 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The jstype option determines the JavaScript type used for values of the
      * field.  The option is permitted only for 64 bit integral and fixed types
-     * (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-     * represented as JavaScript strings.  This avoids loss of precision that can
-     * happen when a large value is converted to a floating point JavaScript
-     * numbers.  Specifying JS_NUMBER for the jstype causes the generated
-     * JavaScript code to use the JavaScript "number" type instead of strings.
-     * This option is an enum to permit additional types to be added,
-     * e.g. goog.math.Integer.
-     * </pre>
+     * (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+     * is represented as JavaScript string, which avoids loss of precision that
+     * can happen when a large value is converted to a floating point JavaScript.
+     * Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+     * use the JavaScript "number" type.  The behavior of the default option
+     * JS_NORMAL is implementation dependent.
+     * This option is an enum to permit additional types to be added, e.g.
+     * goog.math.Integer.
      *
-     * <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
+     * @return int
      */
     public function getJstype()
     {
@@ -223,25 +275,28 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The jstype option determines the JavaScript type used for values of the
      * field.  The option is permitted only for 64 bit integral and fixed types
-     * (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-     * represented as JavaScript strings.  This avoids loss of precision that can
-     * happen when a large value is converted to a floating point JavaScript
-     * numbers.  Specifying JS_NUMBER for the jstype causes the generated
-     * JavaScript code to use the JavaScript "number" type instead of strings.
-     * This option is an enum to permit additional types to be added,
-     * e.g. goog.math.Integer.
-     * </pre>
+     * (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+     * is represented as JavaScript string, which avoids loss of precision that
+     * can happen when a large value is converted to a floating point JavaScript.
+     * Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+     * use the JavaScript "number" type.  The behavior of the default option
+     * JS_NORMAL is implementation dependent.
+     * This option is an enum to permit additional types to be added, e.g.
+     * goog.math.Integer.
      *
-     * <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];</code>
+     * @param int $var
+     * @return $this
      */
     public function setJstype($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\FieldOptions_JSType::class);
         $this->jstype = $var;
         $this->has_jstype = true;
+
+        return $this;
     }
 
     public function hasJstype()
@@ -250,7 +305,6 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Should this field be parsed lazily?  Lazy applies only to message-type
      * fields.  It means that when the outer message is initially parsed, the
      * inner message's contents will not be parsed but instead stored in encoded
@@ -275,9 +329,9 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
      * implementation must either *always* check its required fields, or *never*
      * check its required fields, regardless of whether or not the message has
      * been parsed.
-     * </pre>
      *
-     * <code>optional bool lazy = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool lazy = 5 [default = false];</code>
+     * @return bool
      */
     public function getLazy()
     {
@@ -285,7 +339,6 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Should this field be parsed lazily?  Lazy applies only to message-type
      * fields.  It means that when the outer message is initially parsed, the
      * inner message's contents will not be parsed but instead stored in encoded
@@ -310,15 +363,18 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
      * implementation must either *always* check its required fields, or *never*
      * check its required fields, regardless of whether or not the message has
      * been parsed.
-     * </pre>
      *
-     * <code>optional bool lazy = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool lazy = 5 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setLazy($var)
     {
         GPBUtil::checkBool($var);
         $this->lazy = $var;
         $this->has_lazy = true;
+
+        return $this;
     }
 
     public function hasLazy()
@@ -327,14 +383,13 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this field deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for accessors, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating fields.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -342,20 +397,22 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this field deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for accessors, or it will be completely ignored; in the very least, this
      * is a formalization for deprecating fields.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -364,11 +421,10 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>optional bool weak = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool weak = 10 [default = false];</code>
+     * @return bool
      */
     public function getWeak()
     {
@@ -376,17 +432,19 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>optional bool weak = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool weak = 10 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setWeak($var)
     {
         GPBUtil::checkBool($var);
         $this->weak = $var;
         $this->has_weak = true;
+
+        return $this;
     }
 
     public function hasWeak()
@@ -395,11 +453,10 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -407,17 +464,19 @@ class FieldOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/FieldOptions/CType.php b/php/src/Google/Protobuf/Internal/FieldOptions/CType.php
new file mode 100644
index 00000000..016197ac
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FieldOptions/CType.php
@@ -0,0 +1,30 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\FieldOptions;
+
+/**
+ * Protobuf type <code>google.protobuf.FieldOptions.CType</code>
+ */
+class CType
+{
+    /**
+     * Default mode.
+     *
+     * Generated from protobuf enum <code>STRING = 0;</code>
+     */
+    const STRING = 0;
+    /**
+     * Generated from protobuf enum <code>CORD = 1;</code>
+     */
+    const CORD = 1;
+    /**
+     * Generated from protobuf enum <code>STRING_PIECE = 2;</code>
+     */
+    const STRING_PIECE = 2;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(CType::class, \Google\Protobuf\Internal\FieldOptions_CType::class);
+
diff --git a/php/src/Google/Protobuf/Internal/FieldOptions/JSType.php b/php/src/Google/Protobuf/Internal/FieldOptions/JSType.php
new file mode 100644
index 00000000..f7b78a1b
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FieldOptions/JSType.php
@@ -0,0 +1,34 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\FieldOptions;
+
+/**
+ * Protobuf type <code>google.protobuf.FieldOptions.JSType</code>
+ */
+class JSType
+{
+    /**
+     * Use the default type.
+     *
+     * Generated from protobuf enum <code>JS_NORMAL = 0;</code>
+     */
+    const JS_NORMAL = 0;
+    /**
+     * Use JavaScript strings.
+     *
+     * Generated from protobuf enum <code>JS_STRING = 1;</code>
+     */
+    const JS_STRING = 1;
+    /**
+     * Use JavaScript numbers.
+     *
+     * Generated from protobuf enum <code>JS_NUMBER = 2;</code>
+     */
+    const JS_NUMBER = 2;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(JSType::class, \Google\Protobuf\Internal\FieldOptions_JSType::class);
+
diff --git a/php/src/Google/Protobuf/Internal/FieldOptions_CType.php b/php/src/Google/Protobuf/Internal/FieldOptions_CType.php
deleted file mode 100644
index 2ff2a478..00000000
--- a/php/src/Google/Protobuf/Internal/FieldOptions_CType.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * Protobuf enum <code>google.protobuf.FieldOptions.CType</code>
- */
-namespace Google\Protobuf\Internal;
-
-class FieldOptions_CType
-{
-    /**
-     * <pre>
-     * Default mode.
-     * </pre>
-     *
-     * <code>STRING = 0;</code>
-     */
-    const STRING = 0;
-    /**
-     * <code>CORD = 1;</code>
-     */
-    const CORD = 1;
-    /**
-     * <code>STRING_PIECE = 2;</code>
-     */
-    const STRING_PIECE = 2;
-}
-
diff --git a/php/src/Google/Protobuf/Internal/FieldOptions_JSType.php b/php/src/Google/Protobuf/Internal/FieldOptions_JSType.php
deleted file mode 100644
index 541c8ae5..00000000
--- a/php/src/Google/Protobuf/Internal/FieldOptions_JSType.php
+++ /dev/null
@@ -1,37 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * Protobuf enum <code>google.protobuf.FieldOptions.JSType</code>
- */
-namespace Google\Protobuf\Internal;
-
-class FieldOptions_JSType
-{
-    /**
-     * <pre>
-     * Use the default type.
-     * </pre>
-     *
-     * <code>JS_NORMAL = 0;</code>
-     */
-    const JS_NORMAL = 0;
-    /**
-     * <pre>
-     * Use JavaScript strings.
-     * </pre>
-     *
-     * <code>JS_STRING = 1;</code>
-     */
-    const JS_STRING = 1;
-    /**
-     * <pre>
-     * Use JavaScript numbers.
-     * </pre>
-     *
-     * <code>JS_NUMBER = 2;</code>
-     */
-    const JS_NUMBER = 2;
-}
-
diff --git a/php/src/Google/Protobuf/Internal/FileDescriptor.php b/php/src/Google/Protobuf/Internal/FileDescriptor.php
new file mode 100644
index 00000000..038da38c
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FileDescriptor.php
@@ -0,0 +1,89 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class FileDescriptor
+{
+
+    private $package;
+    private $message_type = [];
+    private $enum_type = [];
+
+    public function setPackage($package)
+    {
+        $this->package = $package;
+    }
+
+    public function getPackage()
+    {
+        return $this->package;
+    }
+
+    public function getMessageType()
+    {
+        return $this->message_type;
+    }
+
+    public function addMessageType($desc)
+    {
+        $this->message_type[] = $desc;
+    }
+
+    public function getEnumType()
+    {
+        return $this->enum_type;
+    }
+
+    public function addEnumType($desc)
+    {
+        $this->enum_type[]= $desc;
+    }
+
+    public static function buildFromProto($proto)
+    {
+        $file = new FileDescriptor();
+        $file->setPackage($proto->getPackage());
+        foreach ($proto->getMessageType() as $message_proto) {
+            $file->addMessageType(Descriptor::buildFromProto(
+                $message_proto, $proto, ""));
+        }
+        foreach ($proto->getEnumType() as $enum_proto) {
+            $file->addEnumType(
+                EnumDescriptor::buildFromProto(
+                    $enum_proto,
+                    $proto,
+                    ""));
+        }
+        return $file;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/FileDescriptorProto.php b/php/src/Google/Protobuf/Internal/FileDescriptorProto.php
index 39f67768..cb10aa79 100644
--- a/php/src/Google/Protobuf/Internal/FileDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/FileDescriptorProto.php
@@ -8,127 +8,140 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a complete .proto file.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.FileDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.FileDescriptorProto</code>
  */
 class FileDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * file name, relative to root of source tree
-     * </pre>
      *
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <pre>
      * e.g. "foo", "foo.bar", etc.
-     * </pre>
      *
-     * <code>optional string package = 2;</code>
+     * Generated from protobuf field <code>optional string package = 2;</code>
      */
     private $package = '';
     private $has_package = false;
     /**
-     * <pre>
      * Names of files imported by this file.
-     * </pre>
      *
-     * <code>repeated string dependency = 3;</code>
+     * Generated from protobuf field <code>repeated string dependency = 3;</code>
      */
     private $dependency;
     private $has_dependency = false;
     /**
-     * <pre>
      * Indexes of the public imported files in the dependency list above.
-     * </pre>
      *
-     * <code>repeated int32 public_dependency = 10;</code>
+     * Generated from protobuf field <code>repeated int32 public_dependency = 10;</code>
      */
     private $public_dependency;
     private $has_public_dependency = false;
     /**
-     * <pre>
      * Indexes of the weak imported files in the dependency list.
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>repeated int32 weak_dependency = 11;</code>
+     * Generated from protobuf field <code>repeated int32 weak_dependency = 11;</code>
      */
     private $weak_dependency;
     private $has_weak_dependency = false;
     /**
-     * <pre>
      * All top-level definitions in this file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
      */
     private $message_type;
     private $has_message_type = false;
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
      */
     private $enum_type;
     private $has_enum_type = false;
     /**
-     * <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
      */
     private $service;
     private $has_service = false;
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
      */
     private $extension;
     private $has_extension = false;
     /**
-     * <code>optional .google.protobuf.FileOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions options = 8;</code>
      */
     private $options = null;
     private $has_options = false;
     /**
-     * <pre>
      * This field contains optional information about the original source code.
      * You may safely remove this entire field without harming runtime
      * functionality of the descriptors -- the information is needed only by
      * development tools.
-     * </pre>
      *
-     * <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
      */
     private $source_code_info = null;
     private $has_source_code_info = false;
     /**
-     * <pre>
      * The syntax of the proto file.
      * The supported values are "proto2" and "proto3".
-     * </pre>
      *
-     * <code>optional string syntax = 12;</code>
+     * Generated from protobuf field <code>optional string syntax = 12;</code>
      */
     private $syntax = '';
     private $has_syntax = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           file name, relative to root of source tree
+     *     @type string $package
+     *           e.g. "foo", "foo.bar", etc.
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $dependency
+     *           Names of files imported by this file.
+     *     @type int[]|\Google\Protobuf\Internal\RepeatedField $public_dependency
+     *           Indexes of the public imported files in the dependency list above.
+     *     @type int[]|\Google\Protobuf\Internal\RepeatedField $weak_dependency
+     *           Indexes of the weak imported files in the dependency list.
+     *           For Google-internal migration only. Do not use.
+     *     @type \Google\Protobuf\Internal\DescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $message_type
+     *           All top-level definitions in this file.
+     *     @type \Google\Protobuf\Internal\EnumDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $enum_type
+     *     @type \Google\Protobuf\Internal\ServiceDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $service
+     *     @type \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $extension
+     *     @type \Google\Protobuf\Internal\FileOptions $options
+     *     @type \Google\Protobuf\Internal\SourceCodeInfo $source_code_info
+     *           This field contains optional information about the original source code.
+     *           You may safely remove this entire field without harming runtime
+     *           functionality of the descriptors -- the information is needed only by
+     *           development tools.
+     *     @type string $syntax
+     *           The syntax of the proto file.
+     *           The supported values are "proto2" and "proto3".
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * file name, relative to root of source tree
-     * </pre>
      *
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -136,17 +149,19 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * file name, relative to root of source tree
-     * </pre>
      *
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -155,11 +170,10 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * e.g. "foo", "foo.bar", etc.
-     * </pre>
      *
-     * <code>optional string package = 2;</code>
+     * Generated from protobuf field <code>optional string package = 2;</code>
+     * @return string
      */
     public function getPackage()
     {
@@ -167,17 +181,19 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * e.g. "foo", "foo.bar", etc.
-     * </pre>
      *
-     * <code>optional string package = 2;</code>
+     * Generated from protobuf field <code>optional string package = 2;</code>
+     * @param string $var
+     * @return $this
      */
     public function setPackage($var)
     {
         GPBUtil::checkString($var, True);
         $this->package = $var;
         $this->has_package = true;
+
+        return $this;
     }
 
     public function hasPackage()
@@ -186,11 +202,10 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Names of files imported by this file.
-     * </pre>
      *
-     * <code>repeated string dependency = 3;</code>
+     * Generated from protobuf field <code>repeated string dependency = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getDependency()
     {
@@ -198,17 +213,19 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Names of files imported by this file.
-     * </pre>
      *
-     * <code>repeated string dependency = 3;</code>
+     * Generated from protobuf field <code>repeated string dependency = 3;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setDependency(&$var)
+    public function setDependency($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
-        $this->dependency = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->dependency = $arr;
         $this->has_dependency = true;
+
+        return $this;
     }
 
     public function hasDependency()
@@ -217,11 +234,10 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Indexes of the public imported files in the dependency list above.
-     * </pre>
      *
-     * <code>repeated int32 public_dependency = 10;</code>
+     * Generated from protobuf field <code>repeated int32 public_dependency = 10;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getPublicDependency()
     {
@@ -229,17 +245,19 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Indexes of the public imported files in the dependency list above.
-     * </pre>
      *
-     * <code>repeated int32 public_dependency = 10;</code>
+     * Generated from protobuf field <code>repeated int32 public_dependency = 10;</code>
+     * @param int[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setPublicDependency(&$var)
+    public function setPublicDependency($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
-        $this->public_dependency = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
+        $this->public_dependency = $arr;
         $this->has_public_dependency = true;
+
+        return $this;
     }
 
     public function hasPublicDependency()
@@ -248,12 +266,11 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Indexes of the weak imported files in the dependency list.
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>repeated int32 weak_dependency = 11;</code>
+     * Generated from protobuf field <code>repeated int32 weak_dependency = 11;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getWeakDependency()
     {
@@ -261,18 +278,20 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Indexes of the weak imported files in the dependency list.
      * For Google-internal migration only. Do not use.
-     * </pre>
      *
-     * <code>repeated int32 weak_dependency = 11;</code>
+     * Generated from protobuf field <code>repeated int32 weak_dependency = 11;</code>
+     * @param int[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setWeakDependency(&$var)
+    public function setWeakDependency($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
-        $this->weak_dependency = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
+        $this->weak_dependency = $arr;
         $this->has_weak_dependency = true;
+
+        return $this;
     }
 
     public function hasWeakDependency()
@@ -281,11 +300,10 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * All top-level definitions in this file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getMessageType()
     {
@@ -293,17 +311,19 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * All top-level definitions in this file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.DescriptorProto message_type = 4;</code>
+     * @param \Google\Protobuf\Internal\DescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setMessageType(&$var)
+    public function setMessageType($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto::class);
-        $this->message_type = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\DescriptorProto::class);
+        $this->message_type = $arr;
         $this->has_message_type = true;
+
+        return $this;
     }
 
     public function hasMessageType()
@@ -312,7 +332,8 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getEnumType()
     {
@@ -320,13 +341,17 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.EnumDescriptorProto enum_type = 5;</code>
+     * @param \Google\Protobuf\Internal\EnumDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setEnumType(&$var)
+    public function setEnumType($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumDescriptorProto::class);
-        $this->enum_type = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\EnumDescriptorProto::class);
+        $this->enum_type = $arr;
         $this->has_enum_type = true;
+
+        return $this;
     }
 
     public function hasEnumType()
@@ -335,7 +360,8 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getService()
     {
@@ -343,13 +369,17 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.ServiceDescriptorProto service = 6;</code>
+     * @param \Google\Protobuf\Internal\ServiceDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setService(&$var)
+    public function setService($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\ServiceDescriptorProto::class);
-        $this->service = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\ServiceDescriptorProto::class);
+        $this->service = $arr;
         $this->has_service = true;
+
+        return $this;
     }
 
     public function hasService()
@@ -358,7 +388,8 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getExtension()
     {
@@ -366,13 +397,17 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FieldDescriptorProto extension = 7;</code>
+     * @param \Google\Protobuf\Internal\FieldDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setExtension(&$var)
+    public function setExtension($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
-        $this->extension = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FieldDescriptorProto::class);
+        $this->extension = $arr;
         $this->has_extension = true;
+
+        return $this;
     }
 
     public function hasExtension()
@@ -381,7 +416,8 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FileOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions options = 8;</code>
+     * @return \Google\Protobuf\Internal\FileOptions
      */
     public function getOptions()
     {
@@ -389,13 +425,17 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FileOptions options = 8;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions options = 8;</code>
+     * @param \Google\Protobuf\Internal\FileOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\FileOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
@@ -404,14 +444,13 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * This field contains optional information about the original source code.
      * You may safely remove this entire field without harming runtime
      * functionality of the descriptors -- the information is needed only by
      * development tools.
-     * </pre>
      *
-     * <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
+     * @return \Google\Protobuf\Internal\SourceCodeInfo
      */
     public function getSourceCodeInfo()
     {
@@ -419,20 +458,22 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * This field contains optional information about the original source code.
      * You may safely remove this entire field without harming runtime
      * functionality of the descriptors -- the information is needed only by
      * development tools.
-     * </pre>
      *
-     * <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.SourceCodeInfo source_code_info = 9;</code>
+     * @param \Google\Protobuf\Internal\SourceCodeInfo $var
+     * @return $this
      */
-    public function setSourceCodeInfo(&$var)
+    public function setSourceCodeInfo($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\SourceCodeInfo::class);
         $this->source_code_info = $var;
         $this->has_source_code_info = true;
+
+        return $this;
     }
 
     public function hasSourceCodeInfo()
@@ -441,12 +482,11 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The syntax of the proto file.
      * The supported values are "proto2" and "proto3".
-     * </pre>
      *
-     * <code>optional string syntax = 12;</code>
+     * Generated from protobuf field <code>optional string syntax = 12;</code>
+     * @return string
      */
     public function getSyntax()
     {
@@ -454,18 +494,20 @@ class FileDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The syntax of the proto file.
      * The supported values are "proto2" and "proto3".
-     * </pre>
      *
-     * <code>optional string syntax = 12;</code>
+     * Generated from protobuf field <code>optional string syntax = 12;</code>
+     * @param string $var
+     * @return $this
      */
     public function setSyntax($var)
     {
         GPBUtil::checkString($var, True);
         $this->syntax = $var;
         $this->has_syntax = true;
+
+        return $this;
     }
 
     public function hasSyntax()
diff --git a/php/src/Google/Protobuf/Internal/FileDescriptorSet.php b/php/src/Google/Protobuf/Internal/FileDescriptorSet.php
index 20a165c4..9907b17d 100644
--- a/php/src/Google/Protobuf/Internal/FileDescriptorSet.php
+++ b/php/src/Google/Protobuf/Internal/FileDescriptorSet.php
@@ -8,32 +8,39 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * The protocol compiler can output a FileDescriptorSet containing the .proto
  * files it parses.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.FileDescriptorSet</code>
+ * Generated from protobuf message <code>google.protobuf.FileDescriptorSet</code>
  */
 class FileDescriptorSet extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
      */
     private $file;
     private $has_file = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\FileDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $file
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getFile()
     {
@@ -41,13 +48,17 @@ class FileDescriptorSet extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.FileDescriptorProto file = 1;</code>
+     * @param \Google\Protobuf\Internal\FileDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setFile(&$var)
+    public function setFile($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FileDescriptorProto::class);
-        $this->file = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\FileDescriptorProto::class);
+        $this->file = $arr;
         $this->has_file = true;
+
+        return $this;
     }
 
     public function hasFile()
diff --git a/php/src/Google/Protobuf/Internal/FileOptions.php b/php/src/Google/Protobuf/Internal/FileOptions.php
index 2422f3ee..c6b36bbc 100644
--- a/php/src/Google/Protobuf/Internal/FileOptions.php
+++ b/php/src/Google/Protobuf/Internal/FileOptions.php
@@ -8,96 +8,82 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.FileOptions</code>
+ * Generated from protobuf message <code>google.protobuf.FileOptions</code>
  */
 class FileOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Sets the Java package where classes generated from this .proto will be
      * placed.  By default, the proto package is used, but this is often
      * inappropriate because proto packages do not normally start with backwards
      * domain names.
-     * </pre>
      *
-     * <code>optional string java_package = 1;</code>
+     * Generated from protobuf field <code>optional string java_package = 1;</code>
      */
     private $java_package = '';
     private $has_java_package = false;
     /**
-     * <pre>
      * If set, all the classes from the .proto file are wrapped in a single
      * outer class with the given name.  This applies to both Proto1
      * (equivalent to the old "--one_java_file" option) and Proto2 (where
      * a .proto always translates to a single class, but you may want to
      * explicitly choose the class name).
-     * </pre>
      *
-     * <code>optional string java_outer_classname = 8;</code>
+     * Generated from protobuf field <code>optional string java_outer_classname = 8;</code>
      */
     private $java_outer_classname = '';
     private $has_java_outer_classname = false;
     /**
-     * <pre>
      * If set true, then the Java code generator will generate a separate .java
      * file for each top-level message, enum, and service defined in the .proto
      * file.  Thus, these types will *not* be nested inside the outer class
      * named by java_outer_classname.  However, the outer class will still be
      * generated to contain the file's getDescriptor() method as well as any
      * top-level extensions defined in the file.
-     * </pre>
      *
-     * <code>optional bool java_multiple_files = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_multiple_files = 10 [default = false];</code>
      */
     private $java_multiple_files = false;
     private $has_java_multiple_files = false;
     /**
-     * <pre>
      * This option does nothing.
-     * </pre>
      *
-     * <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
+     * Generated from protobuf field <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
      */
     private $java_generate_equals_and_hash = false;
     private $has_java_generate_equals_and_hash = false;
     /**
-     * <pre>
      * If set true, then the Java2 code generator will generate code that
      * throws an exception whenever an attempt is made to assign a non-UTF-8
      * byte sequence to a string field.
      * Message reflection will do the same.
      * However, an extension field still accepts non-UTF-8 byte sequences.
      * This option has no effect on when used with the lite runtime.
-     * </pre>
      *
-     * <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
      */
     private $java_string_check_utf8 = false;
     private $has_java_string_check_utf8 = false;
     /**
-     * <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
      */
     private $optimize_for = 0;
     private $has_optimize_for = false;
     /**
-     * <pre>
      * Sets the Go package where structs generated from this .proto will be
      * placed. If omitted, the Go package will be derived from the following:
      *   - The basename of the package import path, if provided.
      *   - Otherwise, the package statement in the .proto file, if present.
      *   - Otherwise, the basename of the .proto file, without extension.
-     * </pre>
      *
-     * <code>optional string go_package = 11;</code>
+     * Generated from protobuf field <code>optional string go_package = 11;</code>
      */
     private $go_package = '';
     private $has_go_package = false;
     /**
-     * <pre>
      * Should generic services be generated in each language?  "Generic" services
      * are not specific to any particular RPC system.  They are generated by the
      * main code generators in each language (without additional plugins).
@@ -107,99 +93,217 @@ class FileOptions extends \Google\Protobuf\Internal\Message
      * that generate code specific to your particular RPC system.  Therefore,
      * these default to false.  Old code which depends on generic services should
      * explicitly set them to true.
-     * </pre>
      *
-     * <code>optional bool cc_generic_services = 16 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_generic_services = 16 [default = false];</code>
      */
     private $cc_generic_services = false;
     private $has_cc_generic_services = false;
     /**
-     * <code>optional bool java_generic_services = 17 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_generic_services = 17 [default = false];</code>
      */
     private $java_generic_services = false;
     private $has_java_generic_services = false;
     /**
-     * <code>optional bool py_generic_services = 18 [default = false];</code>
+     * Generated from protobuf field <code>optional bool py_generic_services = 18 [default = false];</code>
      */
     private $py_generic_services = false;
     private $has_py_generic_services = false;
     /**
-     * <pre>
+     * Generated from protobuf field <code>optional bool php_generic_services = 42 [default = false];</code>
+     */
+    private $php_generic_services = false;
+    private $has_php_generic_services = false;
+    /**
      * Is this file deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for everything in the file, or it will be completely ignored; in the very
      * least, this is a formalization for deprecating files.
-     * </pre>
      *
-     * <code>optional bool deprecated = 23 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 23 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * Enables the use of arenas for the proto messages in this file. This applies
      * only to generated classes for C++.
-     * </pre>
      *
-     * <code>optional bool cc_enable_arenas = 31 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_enable_arenas = 31 [default = false];</code>
      */
     private $cc_enable_arenas = false;
     private $has_cc_enable_arenas = false;
     /**
-     * <pre>
      * Sets the objective c class prefix which is prepended to all objective c
      * generated classes from this .proto. There is no default.
-     * </pre>
      *
-     * <code>optional string objc_class_prefix = 36;</code>
+     * Generated from protobuf field <code>optional string objc_class_prefix = 36;</code>
      */
     private $objc_class_prefix = '';
     private $has_objc_class_prefix = false;
     /**
-     * <pre>
      * Namespace for generated classes; defaults to the package.
-     * </pre>
      *
-     * <code>optional string csharp_namespace = 37;</code>
+     * Generated from protobuf field <code>optional string csharp_namespace = 37;</code>
      */
     private $csharp_namespace = '';
     private $has_csharp_namespace = false;
     /**
-     * <pre>
      * By default Swift generators will take the proto package and CamelCase it
      * replacing '.' with underscore and use that to prefix the types/symbols
      * defined. When this options is provided, they will use this value instead
      * to prefix the types/symbols defined.
-     * </pre>
      *
-     * <code>optional string swift_prefix = 39;</code>
+     * Generated from protobuf field <code>optional string swift_prefix = 39;</code>
      */
     private $swift_prefix = '';
     private $has_swift_prefix = false;
     /**
-     * <pre>
-     * The parser stores options it doesn't recognize here. See above.
-     * </pre>
+     * Sets the php class prefix which is prepended to all php generated classes
+     * from this .proto. Default is empty.
+     *
+     * Generated from protobuf field <code>optional string php_class_prefix = 40;</code>
+     */
+    private $php_class_prefix = '';
+    private $has_php_class_prefix = false;
+    /**
+     * Use this option to change the namespace of php generated classes. Default
+     * is empty. When this option is empty, the package name will be used for
+     * determining the namespace.
+     *
+     * Generated from protobuf field <code>optional string php_namespace = 41;</code>
+     */
+    private $php_namespace = '';
+    private $has_php_namespace = false;
+    /**
+     * Use this option to change the namespace of php generated metadata classes.
+     * Default is empty. When this option is empty, the proto file name will be used
+     * for determining the namespace.
+     *
+     * Generated from protobuf field <code>optional string php_metadata_namespace = 44;</code>
+     */
+    private $php_metadata_namespace = '';
+    private $has_php_metadata_namespace = false;
+    /**
+     * Use this option to change the package of ruby generated classes. Default
+     * is empty. When this option is not set, the package name will be used for
+     * determining the ruby package.
+     *
+     * Generated from protobuf field <code>optional string ruby_package = 45;</code>
+     */
+    private $ruby_package = '';
+    private $has_ruby_package = false;
+    /**
+     * The parser stores options it doesn't recognize here.
+     * See the documentation for the "Options" section above.
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $java_package
+     *           Sets the Java package where classes generated from this .proto will be
+     *           placed.  By default, the proto package is used, but this is often
+     *           inappropriate because proto packages do not normally start with backwards
+     *           domain names.
+     *     @type string $java_outer_classname
+     *           If set, all the classes from the .proto file are wrapped in a single
+     *           outer class with the given name.  This applies to both Proto1
+     *           (equivalent to the old "--one_java_file" option) and Proto2 (where
+     *           a .proto always translates to a single class, but you may want to
+     *           explicitly choose the class name).
+     *     @type bool $java_multiple_files
+     *           If set true, then the Java code generator will generate a separate .java
+     *           file for each top-level message, enum, and service defined in the .proto
+     *           file.  Thus, these types will *not* be nested inside the outer class
+     *           named by java_outer_classname.  However, the outer class will still be
+     *           generated to contain the file's getDescriptor() method as well as any
+     *           top-level extensions defined in the file.
+     *     @type bool $java_generate_equals_and_hash
+     *           This option does nothing.
+     *     @type bool $java_string_check_utf8
+     *           If set true, then the Java2 code generator will generate code that
+     *           throws an exception whenever an attempt is made to assign a non-UTF-8
+     *           byte sequence to a string field.
+     *           Message reflection will do the same.
+     *           However, an extension field still accepts non-UTF-8 byte sequences.
+     *           This option has no effect on when used with the lite runtime.
+     *     @type int $optimize_for
+     *     @type string $go_package
+     *           Sets the Go package where structs generated from this .proto will be
+     *           placed. If omitted, the Go package will be derived from the following:
+     *             - The basename of the package import path, if provided.
+     *             - Otherwise, the package statement in the .proto file, if present.
+     *             - Otherwise, the basename of the .proto file, without extension.
+     *     @type bool $cc_generic_services
+     *           Should generic services be generated in each language?  "Generic" services
+     *           are not specific to any particular RPC system.  They are generated by the
+     *           main code generators in each language (without additional plugins).
+     *           Generic services were the only kind of service generation supported by
+     *           early versions of google.protobuf.
+     *           Generic services are now considered deprecated in favor of using plugins
+     *           that generate code specific to your particular RPC system.  Therefore,
+     *           these default to false.  Old code which depends on generic services should
+     *           explicitly set them to true.
+     *     @type bool $java_generic_services
+     *     @type bool $py_generic_services
+     *     @type bool $php_generic_services
+     *     @type bool $deprecated
+     *           Is this file deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for everything in the file, or it will be completely ignored; in the very
+     *           least, this is a formalization for deprecating files.
+     *     @type bool $cc_enable_arenas
+     *           Enables the use of arenas for the proto messages in this file. This applies
+     *           only to generated classes for C++.
+     *     @type string $objc_class_prefix
+     *           Sets the objective c class prefix which is prepended to all objective c
+     *           generated classes from this .proto. There is no default.
+     *     @type string $csharp_namespace
+     *           Namespace for generated classes; defaults to the package.
+     *     @type string $swift_prefix
+     *           By default Swift generators will take the proto package and CamelCase it
+     *           replacing '.' with underscore and use that to prefix the types/symbols
+     *           defined. When this options is provided, they will use this value instead
+     *           to prefix the types/symbols defined.
+     *     @type string $php_class_prefix
+     *           Sets the php class prefix which is prepended to all php generated classes
+     *           from this .proto. Default is empty.
+     *     @type string $php_namespace
+     *           Use this option to change the namespace of php generated classes. Default
+     *           is empty. When this option is empty, the package name will be used for
+     *           determining the namespace.
+     *     @type string $php_metadata_namespace
+     *           Use this option to change the namespace of php generated metadata classes.
+     *           Default is empty. When this option is empty, the proto file name will be used
+     *           for determining the namespace.
+     *     @type string $ruby_package
+     *           Use this option to change the package of ruby generated classes. Default
+     *           is empty. When this option is not set, the package name will be used for
+     *           determining the ruby package.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here.
+     *           See the documentation for the "Options" section above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Sets the Java package where classes generated from this .proto will be
      * placed.  By default, the proto package is used, but this is often
      * inappropriate because proto packages do not normally start with backwards
      * domain names.
-     * </pre>
      *
-     * <code>optional string java_package = 1;</code>
+     * Generated from protobuf field <code>optional string java_package = 1;</code>
+     * @return string
      */
     public function getJavaPackage()
     {
@@ -207,20 +311,22 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Sets the Java package where classes generated from this .proto will be
      * placed.  By default, the proto package is used, but this is often
      * inappropriate because proto packages do not normally start with backwards
      * domain names.
-     * </pre>
      *
-     * <code>optional string java_package = 1;</code>
+     * Generated from protobuf field <code>optional string java_package = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setJavaPackage($var)
     {
         GPBUtil::checkString($var, True);
         $this->java_package = $var;
         $this->has_java_package = true;
+
+        return $this;
     }
 
     public function hasJavaPackage()
@@ -229,15 +335,14 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set, all the classes from the .proto file are wrapped in a single
      * outer class with the given name.  This applies to both Proto1
      * (equivalent to the old "--one_java_file" option) and Proto2 (where
      * a .proto always translates to a single class, but you may want to
      * explicitly choose the class name).
-     * </pre>
      *
-     * <code>optional string java_outer_classname = 8;</code>
+     * Generated from protobuf field <code>optional string java_outer_classname = 8;</code>
+     * @return string
      */
     public function getJavaOuterClassname()
     {
@@ -245,21 +350,23 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set, all the classes from the .proto file are wrapped in a single
      * outer class with the given name.  This applies to both Proto1
      * (equivalent to the old "--one_java_file" option) and Proto2 (where
      * a .proto always translates to a single class, but you may want to
      * explicitly choose the class name).
-     * </pre>
      *
-     * <code>optional string java_outer_classname = 8;</code>
+     * Generated from protobuf field <code>optional string java_outer_classname = 8;</code>
+     * @param string $var
+     * @return $this
      */
     public function setJavaOuterClassname($var)
     {
         GPBUtil::checkString($var, True);
         $this->java_outer_classname = $var;
         $this->has_java_outer_classname = true;
+
+        return $this;
     }
 
     public function hasJavaOuterClassname()
@@ -268,16 +375,15 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set true, then the Java code generator will generate a separate .java
      * file for each top-level message, enum, and service defined in the .proto
      * file.  Thus, these types will *not* be nested inside the outer class
      * named by java_outer_classname.  However, the outer class will still be
      * generated to contain the file's getDescriptor() method as well as any
      * top-level extensions defined in the file.
-     * </pre>
      *
-     * <code>optional bool java_multiple_files = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_multiple_files = 10 [default = false];</code>
+     * @return bool
      */
     public function getJavaMultipleFiles()
     {
@@ -285,22 +391,24 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set true, then the Java code generator will generate a separate .java
      * file for each top-level message, enum, and service defined in the .proto
      * file.  Thus, these types will *not* be nested inside the outer class
      * named by java_outer_classname.  However, the outer class will still be
      * generated to contain the file's getDescriptor() method as well as any
      * top-level extensions defined in the file.
-     * </pre>
      *
-     * <code>optional bool java_multiple_files = 10 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_multiple_files = 10 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setJavaMultipleFiles($var)
     {
         GPBUtil::checkBool($var);
         $this->java_multiple_files = $var;
         $this->has_java_multiple_files = true;
+
+        return $this;
     }
 
     public function hasJavaMultipleFiles()
@@ -309,11 +417,10 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * This option does nothing.
-     * </pre>
      *
-     * <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
+     * Generated from protobuf field <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
+     * @return bool
      */
     public function getJavaGenerateEqualsAndHash()
     {
@@ -321,17 +428,19 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * This option does nothing.
-     * </pre>
      *
-     * <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
+     * Generated from protobuf field <code>optional bool java_generate_equals_and_hash = 20 [deprecated = true];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setJavaGenerateEqualsAndHash($var)
     {
         GPBUtil::checkBool($var);
         $this->java_generate_equals_and_hash = $var;
         $this->has_java_generate_equals_and_hash = true;
+
+        return $this;
     }
 
     public function hasJavaGenerateEqualsAndHash()
@@ -340,16 +449,15 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set true, then the Java2 code generator will generate code that
      * throws an exception whenever an attempt is made to assign a non-UTF-8
      * byte sequence to a string field.
      * Message reflection will do the same.
      * However, an extension field still accepts non-UTF-8 byte sequences.
      * This option has no effect on when used with the lite runtime.
-     * </pre>
      *
-     * <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
+     * @return bool
      */
     public function getJavaStringCheckUtf8()
     {
@@ -357,22 +465,24 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If set true, then the Java2 code generator will generate code that
      * throws an exception whenever an attempt is made to assign a non-UTF-8
      * byte sequence to a string field.
      * Message reflection will do the same.
      * However, an extension field still accepts non-UTF-8 byte sequences.
      * This option has no effect on when used with the lite runtime.
-     * </pre>
      *
-     * <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_string_check_utf8 = 27 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setJavaStringCheckUtf8($var)
     {
         GPBUtil::checkBool($var);
         $this->java_string_check_utf8 = $var;
         $this->has_java_string_check_utf8 = true;
+
+        return $this;
     }
 
     public function hasJavaStringCheckUtf8()
@@ -381,7 +491,8 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
+     * @return int
      */
     public function getOptimizeFor()
     {
@@ -389,13 +500,17 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];</code>
+     * @param int $var
+     * @return $this
      */
     public function setOptimizeFor($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\FileOptions_OptimizeMode::class);
         $this->optimize_for = $var;
         $this->has_optimize_for = true;
+
+        return $this;
     }
 
     public function hasOptimizeFor()
@@ -404,15 +519,14 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Sets the Go package where structs generated from this .proto will be
      * placed. If omitted, the Go package will be derived from the following:
      *   - The basename of the package import path, if provided.
      *   - Otherwise, the package statement in the .proto file, if present.
      *   - Otherwise, the basename of the .proto file, without extension.
-     * </pre>
      *
-     * <code>optional string go_package = 11;</code>
+     * Generated from protobuf field <code>optional string go_package = 11;</code>
+     * @return string
      */
     public function getGoPackage()
     {
@@ -420,21 +534,23 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Sets the Go package where structs generated from this .proto will be
      * placed. If omitted, the Go package will be derived from the following:
      *   - The basename of the package import path, if provided.
      *   - Otherwise, the package statement in the .proto file, if present.
      *   - Otherwise, the basename of the .proto file, without extension.
-     * </pre>
      *
-     * <code>optional string go_package = 11;</code>
+     * Generated from protobuf field <code>optional string go_package = 11;</code>
+     * @param string $var
+     * @return $this
      */
     public function setGoPackage($var)
     {
         GPBUtil::checkString($var, True);
         $this->go_package = $var;
         $this->has_go_package = true;
+
+        return $this;
     }
 
     public function hasGoPackage()
@@ -443,7 +559,6 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Should generic services be generated in each language?  "Generic" services
      * are not specific to any particular RPC system.  They are generated by the
      * main code generators in each language (without additional plugins).
@@ -453,9 +568,9 @@ class FileOptions extends \Google\Protobuf\Internal\Message
      * that generate code specific to your particular RPC system.  Therefore,
      * these default to false.  Old code which depends on generic services should
      * explicitly set them to true.
-     * </pre>
      *
-     * <code>optional bool cc_generic_services = 16 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_generic_services = 16 [default = false];</code>
+     * @return bool
      */
     public function getCcGenericServices()
     {
@@ -463,7 +578,6 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Should generic services be generated in each language?  "Generic" services
      * are not specific to any particular RPC system.  They are generated by the
      * main code generators in each language (without additional plugins).
@@ -473,15 +587,18 @@ class FileOptions extends \Google\Protobuf\Internal\Message
      * that generate code specific to your particular RPC system.  Therefore,
      * these default to false.  Old code which depends on generic services should
      * explicitly set them to true.
-     * </pre>
      *
-     * <code>optional bool cc_generic_services = 16 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_generic_services = 16 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setCcGenericServices($var)
     {
         GPBUtil::checkBool($var);
         $this->cc_generic_services = $var;
         $this->has_cc_generic_services = true;
+
+        return $this;
     }
 
     public function hasCcGenericServices()
@@ -490,7 +607,8 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bool java_generic_services = 17 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_generic_services = 17 [default = false];</code>
+     * @return bool
      */
     public function getJavaGenericServices()
     {
@@ -498,13 +616,17 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bool java_generic_services = 17 [default = false];</code>
+     * Generated from protobuf field <code>optional bool java_generic_services = 17 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setJavaGenericServices($var)
     {
         GPBUtil::checkBool($var);
         $this->java_generic_services = $var;
         $this->has_java_generic_services = true;
+
+        return $this;
     }
 
     public function hasJavaGenericServices()
@@ -513,7 +635,8 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bool py_generic_services = 18 [default = false];</code>
+     * Generated from protobuf field <code>optional bool py_generic_services = 18 [default = false];</code>
+     * @return bool
      */
     public function getPyGenericServices()
     {
@@ -521,13 +644,17 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bool py_generic_services = 18 [default = false];</code>
+     * Generated from protobuf field <code>optional bool py_generic_services = 18 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setPyGenericServices($var)
     {
         GPBUtil::checkBool($var);
         $this->py_generic_services = $var;
         $this->has_py_generic_services = true;
+
+        return $this;
     }
 
     public function hasPyGenericServices()
@@ -536,14 +663,41 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
+     * Generated from protobuf field <code>optional bool php_generic_services = 42 [default = false];</code>
+     * @return bool
+     */
+    public function getPhpGenericServices()
+    {
+        return $this->php_generic_services;
+    }
+
+    /**
+     * Generated from protobuf field <code>optional bool php_generic_services = 42 [default = false];</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setPhpGenericServices($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->php_generic_services = $var;
+        $this->has_php_generic_services = true;
+
+        return $this;
+    }
+
+    public function hasPhpGenericServices()
+    {
+        return $this->has_php_generic_services;
+    }
+
+    /**
      * Is this file deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for everything in the file, or it will be completely ignored; in the very
      * least, this is a formalization for deprecating files.
-     * </pre>
      *
-     * <code>optional bool deprecated = 23 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 23 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -551,20 +705,22 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this file deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for everything in the file, or it will be completely ignored; in the very
      * least, this is a formalization for deprecating files.
-     * </pre>
      *
-     * <code>optional bool deprecated = 23 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 23 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -573,12 +729,11 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Enables the use of arenas for the proto messages in this file. This applies
      * only to generated classes for C++.
-     * </pre>
      *
-     * <code>optional bool cc_enable_arenas = 31 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_enable_arenas = 31 [default = false];</code>
+     * @return bool
      */
     public function getCcEnableArenas()
     {
@@ -586,18 +741,20 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Enables the use of arenas for the proto messages in this file. This applies
      * only to generated classes for C++.
-     * </pre>
      *
-     * <code>optional bool cc_enable_arenas = 31 [default = false];</code>
+     * Generated from protobuf field <code>optional bool cc_enable_arenas = 31 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setCcEnableArenas($var)
     {
         GPBUtil::checkBool($var);
         $this->cc_enable_arenas = $var;
         $this->has_cc_enable_arenas = true;
+
+        return $this;
     }
 
     public function hasCcEnableArenas()
@@ -606,12 +763,11 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Sets the objective c class prefix which is prepended to all objective c
      * generated classes from this .proto. There is no default.
-     * </pre>
      *
-     * <code>optional string objc_class_prefix = 36;</code>
+     * Generated from protobuf field <code>optional string objc_class_prefix = 36;</code>
+     * @return string
      */
     public function getObjcClassPrefix()
     {
@@ -619,18 +775,20 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Sets the objective c class prefix which is prepended to all objective c
      * generated classes from this .proto. There is no default.
-     * </pre>
      *
-     * <code>optional string objc_class_prefix = 36;</code>
+     * Generated from protobuf field <code>optional string objc_class_prefix = 36;</code>
+     * @param string $var
+     * @return $this
      */
     public function setObjcClassPrefix($var)
     {
         GPBUtil::checkString($var, True);
         $this->objc_class_prefix = $var;
         $this->has_objc_class_prefix = true;
+
+        return $this;
     }
 
     public function hasObjcClassPrefix()
@@ -639,11 +797,10 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Namespace for generated classes; defaults to the package.
-     * </pre>
      *
-     * <code>optional string csharp_namespace = 37;</code>
+     * Generated from protobuf field <code>optional string csharp_namespace = 37;</code>
+     * @return string
      */
     public function getCsharpNamespace()
     {
@@ -651,17 +808,19 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Namespace for generated classes; defaults to the package.
-     * </pre>
      *
-     * <code>optional string csharp_namespace = 37;</code>
+     * Generated from protobuf field <code>optional string csharp_namespace = 37;</code>
+     * @param string $var
+     * @return $this
      */
     public function setCsharpNamespace($var)
     {
         GPBUtil::checkString($var, True);
         $this->csharp_namespace = $var;
         $this->has_csharp_namespace = true;
+
+        return $this;
     }
 
     public function hasCsharpNamespace()
@@ -670,14 +829,13 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * By default Swift generators will take the proto package and CamelCase it
      * replacing '.' with underscore and use that to prefix the types/symbols
      * defined. When this options is provided, they will use this value instead
      * to prefix the types/symbols defined.
-     * </pre>
      *
-     * <code>optional string swift_prefix = 39;</code>
+     * Generated from protobuf field <code>optional string swift_prefix = 39;</code>
+     * @return string
      */
     public function getSwiftPrefix()
     {
@@ -685,20 +843,22 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * By default Swift generators will take the proto package and CamelCase it
      * replacing '.' with underscore and use that to prefix the types/symbols
      * defined. When this options is provided, they will use this value instead
      * to prefix the types/symbols defined.
-     * </pre>
      *
-     * <code>optional string swift_prefix = 39;</code>
+     * Generated from protobuf field <code>optional string swift_prefix = 39;</code>
+     * @param string $var
+     * @return $this
      */
     public function setSwiftPrefix($var)
     {
         GPBUtil::checkString($var, True);
         $this->swift_prefix = $var;
         $this->has_swift_prefix = true;
+
+        return $this;
     }
 
     public function hasSwiftPrefix()
@@ -707,11 +867,153 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
-     * The parser stores options it doesn't recognize here. See above.
-     * </pre>
+     * Sets the php class prefix which is prepended to all php generated classes
+     * from this .proto. Default is empty.
+     *
+     * Generated from protobuf field <code>optional string php_class_prefix = 40;</code>
+     * @return string
+     */
+    public function getPhpClassPrefix()
+    {
+        return $this->php_class_prefix;
+    }
+
+    /**
+     * Sets the php class prefix which is prepended to all php generated classes
+     * from this .proto. Default is empty.
+     *
+     * Generated from protobuf field <code>optional string php_class_prefix = 40;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setPhpClassPrefix($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->php_class_prefix = $var;
+        $this->has_php_class_prefix = true;
+
+        return $this;
+    }
+
+    public function hasPhpClassPrefix()
+    {
+        return $this->has_php_class_prefix;
+    }
+
+    /**
+     * Use this option to change the namespace of php generated classes. Default
+     * is empty. When this option is empty, the package name will be used for
+     * determining the namespace.
+     *
+     * Generated from protobuf field <code>optional string php_namespace = 41;</code>
+     * @return string
+     */
+    public function getPhpNamespace()
+    {
+        return $this->php_namespace;
+    }
+
+    /**
+     * Use this option to change the namespace of php generated classes. Default
+     * is empty. When this option is empty, the package name will be used for
+     * determining the namespace.
+     *
+     * Generated from protobuf field <code>optional string php_namespace = 41;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setPhpNamespace($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->php_namespace = $var;
+        $this->has_php_namespace = true;
+
+        return $this;
+    }
+
+    public function hasPhpNamespace()
+    {
+        return $this->has_php_namespace;
+    }
+
+    /**
+     * Use this option to change the namespace of php generated metadata classes.
+     * Default is empty. When this option is empty, the proto file name will be used
+     * for determining the namespace.
+     *
+     * Generated from protobuf field <code>optional string php_metadata_namespace = 44;</code>
+     * @return string
+     */
+    public function getPhpMetadataNamespace()
+    {
+        return $this->php_metadata_namespace;
+    }
+
+    /**
+     * Use this option to change the namespace of php generated metadata classes.
+     * Default is empty. When this option is empty, the proto file name will be used
+     * for determining the namespace.
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>optional string php_metadata_namespace = 44;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setPhpMetadataNamespace($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->php_metadata_namespace = $var;
+        $this->has_php_metadata_namespace = true;
+
+        return $this;
+    }
+
+    public function hasPhpMetadataNamespace()
+    {
+        return $this->has_php_metadata_namespace;
+    }
+
+    /**
+     * Use this option to change the package of ruby generated classes. Default
+     * is empty. When this option is not set, the package name will be used for
+     * determining the ruby package.
+     *
+     * Generated from protobuf field <code>optional string ruby_package = 45;</code>
+     * @return string
+     */
+    public function getRubyPackage()
+    {
+        return $this->ruby_package;
+    }
+
+    /**
+     * Use this option to change the package of ruby generated classes. Default
+     * is empty. When this option is not set, the package name will be used for
+     * determining the ruby package.
+     *
+     * Generated from protobuf field <code>optional string ruby_package = 45;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setRubyPackage($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->ruby_package = $var;
+        $this->has_ruby_package = true;
+
+        return $this;
+    }
+
+    public function hasRubyPackage()
+    {
+        return $this->has_ruby_package;
+    }
+
+    /**
+     * The parser stores options it doesn't recognize here.
+     * See the documentation for the "Options" section above.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -719,17 +1021,20 @@ class FileOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
-     * The parser stores options it doesn't recognize here. See above.
-     * </pre>
+     * The parser stores options it doesn't recognize here.
+     * See the documentation for the "Options" section above.
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/FileOptions/OptimizeMode.php b/php/src/Google/Protobuf/Internal/FileOptions/OptimizeMode.php
new file mode 100644
index 00000000..3dd60bf6
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/FileOptions/OptimizeMode.php
@@ -0,0 +1,36 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+namespace Google\Protobuf\Internal\FileOptions;
+
+/**
+ * Generated classes can be optimized for speed or code size.
+ *
+ * Protobuf type <code>google.protobuf.FileOptions.OptimizeMode</code>
+ */
+class OptimizeMode
+{
+    /**
+     * Generate complete code for parsing, serialization,
+     *
+     * Generated from protobuf enum <code>SPEED = 1;</code>
+     */
+    const SPEED = 1;
+    /**
+     * etc.
+     *
+     * Generated from protobuf enum <code>CODE_SIZE = 2;</code>
+     */
+    const CODE_SIZE = 2;
+    /**
+     * Generate code using MessageLite and the lite runtime.
+     *
+     * Generated from protobuf enum <code>LITE_RUNTIME = 3;</code>
+     */
+    const LITE_RUNTIME = 3;
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(OptimizeMode::class, \Google\Protobuf\Internal\FileOptions_OptimizeMode::class);
+
diff --git a/php/src/Google/Protobuf/Internal/FileOptions_OptimizeMode.php b/php/src/Google/Protobuf/Internal/FileOptions_OptimizeMode.php
deleted file mode 100644
index 7fd488eb..00000000
--- a/php/src/Google/Protobuf/Internal/FileOptions_OptimizeMode.php
+++ /dev/null
@@ -1,41 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * <pre>
- * Generated classes can be optimized for speed or code size.
- * </pre>
- *
- * Protobuf enum <code>google.protobuf.FileOptions.OptimizeMode</code>
- */
-namespace Google\Protobuf\Internal;
-
-class FileOptions_OptimizeMode
-{
-    /**
-     * <pre>
-     * Generate complete code for parsing, serialization,
-     * </pre>
-     *
-     * <code>SPEED = 1;</code>
-     */
-    const SPEED = 1;
-    /**
-     * <pre>
-     * etc.
-     * </pre>
-     *
-     * <code>CODE_SIZE = 2;</code>
-     */
-    const CODE_SIZE = 2;
-    /**
-     * <pre>
-     * Generate code using MessageLite and the lite runtime.
-     * </pre>
-     *
-     * <code>LITE_RUNTIME = 3;</code>
-     */
-    const LITE_RUNTIME = 3;
-}
-
diff --git a/php/src/Google/Protobuf/Internal/GPBDecodeException.php b/php/src/Google/Protobuf/Internal/GPBDecodeException.php
new file mode 100644
index 00000000..402d542f
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/GPBDecodeException.php
@@ -0,0 +1,47 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class GPBDecodeException extends \Exception
+{
+    public function __construct(
+        $message,
+        $code = 0,
+        \Exception $previous = null)
+    {
+        parent::__construct(
+            "Error occurred during parsing: " . $message,
+            $code,
+            $previous);
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/GPBJsonWire.php b/php/src/Google/Protobuf/Internal/GPBJsonWire.php
new file mode 100644
index 00000000..9ae57ab3
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/GPBJsonWire.php
@@ -0,0 +1,304 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class GPBJsonWire
+{
+
+    public static function serializeFieldToStream(
+        $value,
+        $field,
+        &$output, $has_field_name = true)
+    {
+        if ($has_field_name) {
+            $output->writeRaw("\"", 1);
+            $field_name = GPBJsonWire::formatFieldName($field);
+            $output->writeRaw($field_name, strlen($field_name));
+            $output->writeRaw("\":", 2);
+        }
+        return static::serializeFieldValueToStream(
+            $value,
+            $field,
+            $output,
+            !$has_field_name);
+    }
+
+    public static function serializeFieldValueToStream(
+        $values,
+        $field,
+        &$output,
+        $is_well_known = false)
+    {
+        if ($field->isMap()) {
+            $output->writeRaw("{", 1);
+            $first = true;
+            $map_entry = $field->getMessageType();
+            $key_field = $map_entry->getFieldByNumber(1);
+            $value_field = $map_entry->getFieldByNumber(2);
+
+            switch ($key_field->getType()) {
+            case GPBType::STRING:
+            case GPBType::SFIXED64:
+            case GPBType::INT64:
+            case GPBType::SINT64:
+            case GPBType::FIXED64:
+            case GPBType::UINT64:
+                $additional_quote = false;
+                break;
+            default:
+                $additional_quote = true;
+            }
+
+            foreach ($values as $key => $value) {
+                if ($first) {
+                    $first = false;
+                } else {
+                    $output->writeRaw(",", 1);
+                }
+                if ($additional_quote) {
+                    $output->writeRaw("\"", 1);
+                }
+                if (!static::serializeSingularFieldValueToStream(
+                    $key,
+                    $key_field,
+                    $output,
+                    $is_well_known)) {
+                    return false;
+                }
+                if ($additional_quote) {
+                    $output->writeRaw("\"", 1);
+                }
+                $output->writeRaw(":", 1);
+                if (!static::serializeSingularFieldValueToStream(
+                    $value,
+                    $value_field,
+                    $output,
+                    $is_well_known)) {
+                    return false;
+                }
+            }
+            $output->writeRaw("}", 1);
+            return true;
+        } elseif ($field->isRepeated()) {
+            $output->writeRaw("[", 1);
+            $first = true;
+            foreach ($values as $value) {
+                if ($first) {
+                    $first = false;
+                } else {
+                    $output->writeRaw(",", 1);
+                }
+                if (!static::serializeSingularFieldValueToStream(
+                    $value,
+                    $field,
+                    $output,
+                    $is_well_known)) {
+                    return false;
+                }
+            }
+            $output->writeRaw("]", 1);
+            return true;
+        } else {
+            return static::serializeSingularFieldValueToStream(
+                $values,
+                $field,
+                $output,
+                $is_well_known);
+        }
+    }
+
+    private static function serializeSingularFieldValueToStream(
+        $value,
+        $field,
+        &$output, $is_well_known = false)
+    {
+        switch ($field->getType()) {
+            case GPBType::SFIXED32:
+            case GPBType::SINT32:
+            case GPBType::INT32:
+                $str_value = strval($value);
+                $output->writeRaw($str_value, strlen($str_value));
+                break;
+            case GPBType::FIXED32:
+            case GPBType::UINT32:
+                if ($value < 0) {
+                    $value = bcadd($value, "4294967296");
+                }
+                $str_value = strval($value);
+                $output->writeRaw($str_value, strlen($str_value));
+                break;
+            case GPBType::FIXED64:
+            case GPBType::UINT64:
+                if ($value < 0) {
+                    $value = bcadd($value, "18446744073709551616");
+                }
+                // Intentional fall through.
+            case GPBType::SFIXED64:
+            case GPBType::INT64:
+            case GPBType::SINT64:
+                $output->writeRaw("\"", 1);
+                $str_value = strval($value);
+                $output->writeRaw($str_value, strlen($str_value));
+                $output->writeRaw("\"", 1);
+                break;
+            case GPBType::FLOAT:
+                if (is_nan($value)) {
+                    $str_value = "\"NaN\"";
+                } elseif ($value === INF) {
+                    $str_value = "\"Infinity\"";
+                } elseif ($value === -INF) {
+                    $str_value = "\"-Infinity\"";
+                } else {
+                    $str_value = sprintf("%.8g", $value);
+                }
+                $output->writeRaw($str_value, strlen($str_value));
+                break;
+            case GPBType::DOUBLE:
+                if (is_nan($value)) {
+                    $str_value = "\"NaN\"";
+                } elseif ($value === INF) {
+                    $str_value = "\"Infinity\"";
+                } elseif ($value === -INF) {
+                    $str_value = "\"-Infinity\"";
+                } else {
+                    $str_value = sprintf("%.17g", $value);
+                }
+                $output->writeRaw($str_value, strlen($str_value));
+                break;
+            case GPBType::ENUM:
+                $enum_desc = $field->getEnumType();
+                if ($enum_desc->getClass() === "Google\Protobuf\NullValue") {
+                    $output->writeRaw("null", 4);
+                    break;
+                }
+                $enum_value_desc = $enum_desc->getValueByNumber($value);
+                if (!is_null($enum_value_desc)) {
+                    $str_value = $enum_value_desc->getName();
+                    $output->writeRaw("\"", 1);
+                    $output->writeRaw($str_value, strlen($str_value));
+                    $output->writeRaw("\"", 1);
+                } else {
+                    $str_value = strval($value);
+                    $output->writeRaw($str_value, strlen($str_value));
+                }
+                break;
+            case GPBType::BOOL:
+                if ($value) {
+                    $output->writeRaw("true", 4);
+                } else {
+                    $output->writeRaw("false", 5);
+                }
+                break;
+            case GPBType::BYTES:
+                $bytes_value = base64_encode($value);
+                $output->writeRaw("\"", 1);
+                $output->writeRaw($bytes_value, strlen($bytes_value));
+                $output->writeRaw("\"", 1);
+                break;
+            case GPBType::STRING:
+                $value = json_encode($value);
+                $output->writeRaw($value, strlen($value));
+                break;
+            //    case GPBType::GROUP:
+            //      echo "GROUP\xA";
+            //      trigger_error("Not implemented.", E_ERROR);
+            //      break;
+            case GPBType::MESSAGE:
+                $value->serializeToJsonStream($output);
+                break;
+            default:
+                user_error("Unsupported type.");
+                return false;
+        }
+        return true;
+    }
+
+    private static function formatFieldName($field)
+    {
+        return $field->getJsonName();
+    }
+
+    // Used for escaping control chars in strings.
+    private static $k_control_char_limit = 0x20;
+
+    private static function jsonNiceEscape($c)
+    {
+      switch ($c) {
+          case '"':  return "\\\"";
+          case '\\': return "\\\\";
+          case '/': return "\\/";
+          case '\b': return "\\b";
+          case '\f': return "\\f";
+          case '\n': return "\\n";
+          case '\r': return "\\r";
+          case '\t': return "\\t";
+          default:   return NULL;
+      }
+    }
+
+    private static function isJsonEscaped($c)
+    {
+        // See RFC 4627.
+        return $c < chr($k_control_char_limit) || $c === "\"" || $c === "\\";
+    }
+
+    public static function escapedJson($value)
+    {
+        $escaped_value = "";
+        $unescaped_run = "";
+        for ($i = 0; $i < strlen($value); $i++) {
+            $c = $value[$i];
+            // Handle escaping.
+            if (static::isJsonEscaped($c)) {
+                // Use a "nice" escape, like \n, if one exists for this
+                // character.
+                $escape = static::jsonNiceEscape($c);
+                if (is_null($escape)) {
+                    $escape = "\\u00" . bin2hex($c);
+                }
+                if ($unescaped_run !== "") {
+                    $escaped_value .= $unescaped_run;
+                    $unescaped_run = "";
+                }
+                $escaped_value .= $escape;
+            } else {
+              if ($unescaped_run === "") {
+                $unescaped_run .= $c;
+              }
+            }
+        }
+        $escaped_value .= $unescaped_run;
+        return $escaped_value;
+    }
+
+}
diff --git a/php/src/Google/Protobuf/Internal/GPBUtil.php b/php/src/Google/Protobuf/Internal/GPBUtil.php
index ba1d2eb3..023b07f4 100644
--- a/php/src/Google/Protobuf/Internal/GPBUtil.php
+++ b/php/src/Google/Protobuf/Internal/GPBUtil.php
@@ -32,20 +32,44 @@
 
 namespace Google\Protobuf\Internal;
 
+use Google\Protobuf\Duration;
+use Google\Protobuf\FieldMask;
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\MapField;
+
+function camel2underscore($input) {
+    preg_match_all(
+        '!([A-Z][A-Z0-9]*(?=$|[A-Z][a-z0-9])|[A-Za-z][a-z0-9]+)!',
+        $input,
+        $matches);
+    $ret = $matches[0];
+    foreach ($ret as &$match) {
+        $match = $match == strtoupper($match) ? strtolower($match) : lcfirst($match);
+    }
+    return implode('_', $ret);
+}
 
 class GPBUtil
 {
-    public function divideInt64ToInt32($value, &$high, &$low, $trim = false)
+    const NANOS_PER_MILLISECOND = 1000000;
+    const NANOS_PER_MICROSECOND = 1000;
+    const TYPE_URL_PREFIX = 'type.googleapis.com/';
+
+    public static function divideInt64ToInt32($value, &$high, &$low, $trim = false)
     {
         $isNeg = (bccomp($value, 0) < 0);
         if ($isNeg) {
             $value = bcsub(0, $value);
         }
 
-        $high = (int) bcdiv(bcadd($value, 1), 4294967296);
+        $high = bcdiv($value, 4294967296);
         $low = bcmod($value, 4294967296);
+        if (bccomp($high, 2147483647) > 0) {
+            $high = (int) bcsub($high, 4294967296);
+        } else {
+            $high = (int) $high;
+        }
         if (bccomp($low, 2147483647) > 0) {
             $low = (int) bcsub($low, 4294967296);
         } else {
@@ -57,7 +81,7 @@ class GPBUtil
             $low = ~$low;
             $low++;
             if (!$low) {
-                $high++;
+                $high = (int)($high + 1);
             }
         }
 
@@ -66,19 +90,16 @@ class GPBUtil
         }
     }
 
-
     public static function checkString(&$var, $check_utf8)
     {
         if (is_array($var) || is_object($var)) {
-            trigger_error("Expect string.", E_USER_ERROR);
-            return;
+            throw new \InvalidArgumentException("Expect string.");
         }
         if (!is_string($var)) {
             $var = strval($var);
         }
         if ($check_utf8 && !preg_match('//u', $var)) {
-            trigger_error("Expect utf-8 encoding.", E_USER_ERROR);
-            return;
+            throw new \Exception("Expect utf-8 encoding.");
         }
     }
 
@@ -92,7 +113,7 @@ class GPBUtil
         if (is_numeric($var)) {
             $var = intval($var);
         } else {
-            trigger_error("Expect integer.", E_USER_ERROR);
+            throw new \Exception("Expect integer.");
         }
     }
 
@@ -109,7 +130,7 @@ class GPBUtil
                 $var = (int) $var;
             }
         } else {
-            trigger_error("Expect integer.", E_USER_ERROR);
+            throw new \Exception("Expect integer.");
         }
     }
 
@@ -119,10 +140,15 @@ class GPBUtil
             if (PHP_INT_SIZE == 8) {
                 $var = intval($var);
             } else {
-                $var = bcdiv($var, 1, 0);
+                if (is_float($var) ||
+                    is_integer($var) ||
+                    (is_string($var) &&
+                         bccomp($var, "9223372036854774784") < 0)) {
+                    $var = number_format($var, 0, ".", "");
+                }
             }
         } else {
-            trigger_error("Expect integer.", E_USER_ERROR);
+            throw new \Exception("Expect integer.");
         }
     }
 
@@ -132,10 +158,10 @@ class GPBUtil
             if (PHP_INT_SIZE == 8) {
                 $var = intval($var);
             } else {
-                $var = bcdiv($var, 1, 0);
+                $var = number_format($var, 0, ".", "");
             }
         } else {
-            trigger_error("Expect integer.", E_USER_ERROR);
+            throw new \Exception("Expect integer.");
         }
     }
 
@@ -144,7 +170,7 @@ class GPBUtil
         if (is_float($var) || is_numeric($var)) {
             $var = floatval($var);
         } else {
-            trigger_error("Expect float.", E_USER_ERROR);
+            throw new \Exception("Expect float.");
         }
     }
 
@@ -153,41 +179,74 @@ class GPBUtil
         if (is_float($var) || is_numeric($var)) {
             $var = floatval($var);
         } else {
-            trigger_error("Expect float.", E_USER_ERROR);
+            throw new \Exception("Expect float.");
         }
     }
 
     public static function checkBool(&$var)
     {
         if (is_array($var) || is_object($var)) {
-            trigger_error("Expect boolean.", E_USER_ERROR);
-            return;
+            throw new \Exception("Expect boolean.");
         }
         $var = boolval($var);
     }
 
-    public static function checkMessage(&$var, $klass)
+    public static function checkMessage(&$var, $klass, $newClass = null)
     {
         if (!$var instanceof $klass && !is_null($var)) {
-            trigger_error("Expect message.", E_USER_ERROR);
+            throw new \Exception("Expect $klass.");
         }
     }
 
     public static function checkRepeatedField(&$var, $type, $klass = null)
     {
-        if (!$var instanceof RepeatedField) {
-            trigger_error("Expect repeated field.", E_USER_ERROR);
+        if (!$var instanceof RepeatedField && !is_array($var)) {
+            throw new \Exception("Expect array.");
         }
-        if ($var->getType() != $type) {
-            trigger_error(
-                "Expect repeated field of different type.",
-                E_USER_ERROR);
+        if (is_array($var)) {
+            $tmp = new RepeatedField($type, $klass);
+            foreach ($var as $value) {
+                $tmp[] = $value;
+            }
+            return $tmp;
+        } else {
+            if ($var->getType() != $type) {
+                throw new \Exception(
+                    "Expect repeated field of different type.");
+            }
+            if ($var->getType() === GPBType::MESSAGE &&
+                $var->getClass() !== $klass) {
+                throw new \Exception(
+                    "Expect repeated field of different message.");
+            }
+            return $var;
+        }
+    }
+
+    public static function checkMapField(&$var, $key_type, $value_type, $klass = null)
+    {
+        if (!$var instanceof MapField && !is_array($var)) {
+            throw new \Exception("Expect dict.");
         }
-        if ($var->getType() === GPBType::MESSAGE &&
-            $var->getClass() !== $klass) {
-            trigger_error(
-                "Expect repeated field of different message.",
-                E_USER_ERROR);
+        if (is_array($var)) {
+            $tmp = new MapField($key_type, $value_type, $klass);
+            foreach ($var as $key => $value) {
+                $tmp[$key] = $value;
+            }
+            return $tmp;
+        } else {
+            if ($var->getKeyType() != $key_type) {
+                throw new \Exception("Expect map field of key type.");
+            }
+            if ($var->getValueType() != $value_type) {
+                throw new \Exception("Expect map field of value type.");
+            }
+            if ($var->getValueType() === GPBType::MESSAGE &&
+                $var->getValueClass() !== $klass) {
+                throw new \Exception(
+                    "Expect map field of different value message.");
+            }
+            return $var;
         }
     }
 
@@ -200,4 +259,321 @@ class GPBUtil
     {
         return new Uint64($value);
     }
+
+    public static function getClassNamePrefix(
+        $classname,
+        $file_proto)
+    {
+        $option = $file_proto->getOptions();
+        $prefix = is_null($option) ? "" : $option->getPhpClassPrefix();
+        if ($prefix !== "") {
+            return $prefix;
+        }
+
+        $reserved_words = array(
+            "abstract"=>0, "and"=>0, "array"=>0, "as"=>0, "break"=>0,
+            "callable"=>0, "case"=>0, "catch"=>0, "class"=>0, "clone"=>0,
+            "const"=>0, "continue"=>0, "declare"=>0, "default"=>0, "die"=>0,
+            "do"=>0, "echo"=>0, "else"=>0, "elseif"=>0, "empty"=>0,
+            "enddeclare"=>0, "endfor"=>0, "endforeach"=>0, "endif"=>0,
+            "endswitch"=>0, "endwhile"=>0, "eval"=>0, "exit"=>0, "extends"=>0,
+            "final"=>0, "for"=>0, "foreach"=>0, "function"=>0, "global"=>0,
+            "goto"=>0, "if"=>0, "implements"=>0, "include"=>0,
+            "include_once"=>0, "instanceof"=>0, "insteadof"=>0, "interface"=>0,
+            "isset"=>0, "list"=>0, "namespace"=>0, "new"=>0, "or"=>0,
+            "print"=>0, "private"=>0, "protected"=>0, "public"=>0, "require"=>0,
+            "require_once"=>0, "return"=>0, "static"=>0, "switch"=>0,
+            "throw"=>0, "trait"=>0, "try"=>0, "unset"=>0, "use"=>0, "var"=>0,
+            "while"=>0, "xor"=>0, "int"=>0, "float"=>0, "bool"=>0, "string"=>0,
+            "true"=>0, "false"=>0, "null"=>0, "void"=>0, "iterable"=>0
+        );
+
+        if (array_key_exists(strtolower($classname), $reserved_words)) {
+            if ($file_proto->getPackage() === "google.protobuf") {
+                return "GPB";
+            } else {
+                return "PB";
+            }
+        }
+
+        return "";
+    }
+
+    public static function getClassNameWithoutPackage(
+        $name,
+        $file_proto)
+    {
+        $parts = explode('.', $name);
+        foreach ($parts as $i => $part) {
+            $parts[$i] = static::getClassNamePrefix($parts[$i], $file_proto) . $parts[$i];
+        }
+        return implode('\\', $parts);
+    }
+
+    public static function getFullClassName(
+        $proto,
+        $containing,
+        $file_proto,
+        &$message_name_without_package,
+        &$classname,
+        &$fullname)
+    {
+        // Full name needs to start with '.'.
+        $message_name_without_package = $proto->getName();
+        if ($containing !== "") {
+            $message_name_without_package =
+                $containing . "." . $message_name_without_package;
+        }
+
+        $package = $file_proto->getPackage();
+        if ($package === "") {
+            $fullname = "." . $message_name_without_package;
+        } else {
+            $fullname = "." . $package . "." . $message_name_without_package;
+        }
+
+        $class_name_without_package =
+            static::getClassNameWithoutPackage($message_name_without_package, $file_proto);
+
+        $option = $file_proto->getOptions();
+        if (!is_null($option) && $option->hasPhpNamespace()) {
+            $namespace = $option->getPhpNamespace();
+            if ($namespace !== "") {
+                $classname = $namespace . "\\" . $class_name_without_package;
+                return;
+            } else {
+                $classname = $class_name_without_package;
+                return;
+            }
+        }
+
+        if ($package === "") {
+            $classname = $class_name_without_package;
+        } else {
+            $parts = array_map('ucwords', explode('.', $package));
+            foreach ($parts as $i => $part) {
+                $parts[$i] = self::getClassNamePrefix($part, $file_proto).$part;
+            }
+            $classname =
+                implode('\\', $parts) .
+                "\\".self::getClassNamePrefix($class_name_without_package,$file_proto).
+                $class_name_without_package;
+        }
+    }
+
+    public static function combineInt32ToInt64($high, $low)
+    {
+        $isNeg = $high < 0;
+        if ($isNeg) {
+            $high = ~$high;
+            $low = ~$low;
+            $low++;
+            if (!$low) {
+                $high = (int) ($high + 1);
+            }
+        }
+        $result = bcadd(bcmul($high, 4294967296), $low);
+        if ($low < 0) {
+            $result = bcadd($result, 4294967296);
+        }
+        if ($isNeg) {
+          $result = bcsub(0, $result);
+        }
+        return $result;
+    }
+
+    public static function parseTimestamp($timestamp)
+    {
+        // prevent parsing timestamps containing with the non-existant year "0000"
+        // DateTime::createFromFormat parses without failing but as a nonsensical date
+        if (substr($timestamp, 0, 4) === "0000") {
+            throw new \Exception("Year cannot be zero.");
+        }
+        // prevent parsing timestamps ending with a lowercase z
+        if (substr($timestamp, -1, 1) === "z") {
+            throw new \Exception("Timezone cannot be a lowercase z.");
+        }
+
+        $nanoseconds = 0;
+        $periodIndex = strpos($timestamp, ".");
+        if ($periodIndex !== false) {
+            $nanosecondsLength = 0;
+            // find the next non-numeric character in the timestamp to calculate
+            // the length of the nanoseconds text
+            for ($i = $periodIndex + 1, $length = strlen($timestamp); $i < $length; $i++) {
+                if (!is_numeric($timestamp[$i])) {
+                    $nanosecondsLength = $i - ($periodIndex + 1);
+                    break;
+                }
+            }
+            if ($nanosecondsLength % 3 !== 0) {
+                throw new \Exception("Nanoseconds must be disible by 3.");
+            }
+            if ($nanosecondsLength > 9) {
+                throw new \Exception("Nanoseconds must be in the range of 0 to 999,999,999 nanoseconds.");
+            }
+            if ($nanosecondsLength > 0) {
+                $nanoseconds = substr($timestamp, $periodIndex + 1, $nanosecondsLength);
+                $nanoseconds = intval($nanoseconds);
+
+                // remove the nanoseconds and preceding period from the timestamp
+                $date = substr($timestamp, 0, $periodIndex - 1);
+                $timezone = substr($timestamp, $periodIndex + $nanosecondsLength);
+                $timestamp = $date.$timezone;
+            }
+        }
+
+        $date = \DateTime::createFromFormat(\DateTime::RFC3339, $timestamp, new \DateTimeZone("UTC"));
+        if ($date === false) {
+            throw new \Exception("Invalid RFC 3339 timestamp.");
+        }
+
+        $value = new \Google\Protobuf\Timestamp();
+        $seconds = $date->format("U");
+        $value->setSeconds($seconds);
+        $value->setNanos($nanoseconds);
+        return $value;
+    }
+
+    public static function formatTimestamp($value)
+    {
+        if (bccomp($value->getSeconds(), "253402300800") != -1) {
+          throw new GPBDecodeException("Duration number too large.");
+        }
+        if (bccomp($value->getSeconds(), "-62135596801") != 1) {
+          throw new GPBDecodeException("Duration number too small.");
+        }
+        $nanoseconds = static::getNanosecondsForTimestamp($value->getNanos());
+        if (!empty($nanoseconds)) {
+            $nanoseconds = ".".$nanoseconds;
+        }
+        $date = new \DateTime('@'.$value->getSeconds(), new \DateTimeZone("UTC"));
+        return $date->format("Y-m-d\TH:i:s".$nanoseconds."\Z");
+    }
+
+    public static function parseDuration($value)
+    {
+        if (strlen($value) < 2 || substr($value, -1) !== "s") {
+          throw new GPBDecodeException("Missing s after duration string");
+        }
+        $number = substr($value, 0, -1);
+        if (bccomp($number, "315576000001") != -1) {
+          throw new GPBDecodeException("Duration number too large.");
+        }
+        if (bccomp($number, "-315576000001") != 1) {
+          throw new GPBDecodeException("Duration number too small.");
+        }
+        $pos = strrpos($number, ".");
+        if ($pos !== false) {
+            $seconds = substr($number, 0, $pos);
+            if (bccomp($seconds, 0) < 0) {
+                $nanos = bcmul("0" . substr($number, $pos), -1000000000);
+            } else {
+                $nanos = bcmul("0" . substr($number, $pos), 1000000000);
+            }
+        } else {
+            $seconds = $number;
+            $nanos = 0;
+        }
+        $duration = new Duration();
+        $duration->setSeconds($seconds);
+        $duration->setNanos($nanos);
+        return $duration;
+    }
+
+    public static function formatDuration($value)
+    {
+        if (bccomp($value->getSeconds(), "315576000001") != -1) {
+          throw new GPBDecodeException("Duration number too large.");
+        }
+        if (bccomp($value->getSeconds(), "-315576000001") != 1) {
+          throw new GPBDecodeException("Duration number too small.");
+        }
+        return strval(bcadd($value->getSeconds(),
+                      $value->getNanos() / 1000000000.0, 9));
+    }
+
+
+
+    public static function parseFieldMask($paths_string)
+    {
+        $path_strings = explode(",", $paths_string);
+        $field_mask = new FieldMask();
+        $paths = $field_mask->getPaths();
+        foreach($path_strings as &$path_string) {
+            $field_strings = explode(".", $path_string);
+            foreach($field_strings as &$field_string) {
+                $field_string = camel2underscore($field_string);
+            }
+            $path_string = implode(".", $field_strings);
+            $paths[] = $path_string;
+        }
+        return $field_mask;
+    }
+
+    public static function formatFieldMask($field_mask)
+    {
+        $converted_paths = [];
+        foreach($field_mask->getPaths() as $path) {
+            $fields = explode('.', $path);
+            $converted_path = [];
+            foreach ($fields as $field) {
+                $segments = explode('_', $field);
+                $start = true;
+                $converted_segments = "";
+                foreach($segments as $segment) {
+                  if (!$start) {
+                    $converted = ucfirst($segment);
+                  } else {
+                    $converted = $segment;
+                    $start = false;
+                  }
+                  $converted_segments .= $converted;
+                }
+                $converted_path []= $converted_segments;
+            }
+            $converted_path = implode(".", $converted_path);
+            $converted_paths []= $converted_path;
+        }
+        return implode(",", $converted_paths);
+    }
+
+    public static function getNanosecondsForTimestamp($nanoseconds)
+    {
+        if ($nanoseconds == 0) {
+            return '';
+        }
+        if ($nanoseconds % static::NANOS_PER_MILLISECOND == 0) {
+            return sprintf('%03d', $nanoseconds / static::NANOS_PER_MILLISECOND);
+        }
+        if ($nanoseconds % static::NANOS_PER_MICROSECOND == 0) {
+            return sprintf('%06d', $nanoseconds / static::NANOS_PER_MICROSECOND);
+        }
+        return sprintf('%09d', $nanoseconds);
+    }
+
+    public static function hasSpecialJsonMapping($msg)
+    {
+        return is_a($msg, 'Google\Protobuf\Any')         ||
+               is_a($msg, "Google\Protobuf\ListValue")   ||
+               is_a($msg, "Google\Protobuf\Struct")      ||
+               is_a($msg, "Google\Protobuf\Value")       ||
+               is_a($msg, "Google\Protobuf\Duration")    ||
+               is_a($msg, "Google\Protobuf\Timestamp")   ||
+               is_a($msg, "Google\Protobuf\FieldMask")   ||
+               static::hasJsonValue($msg);
+    }
+
+    public static function hasJsonValue($msg)
+    {
+        return is_a($msg, "Google\Protobuf\DoubleValue") ||
+               is_a($msg, "Google\Protobuf\FloatValue")  ||
+               is_a($msg, "Google\Protobuf\Int64Value")  ||
+               is_a($msg, "Google\Protobuf\UInt64Value") ||
+               is_a($msg, "Google\Protobuf\Int32Value")  ||
+               is_a($msg, "Google\Protobuf\UInt32Value") ||
+               is_a($msg, "Google\Protobuf\BoolValue")   ||
+               is_a($msg, "Google\Protobuf\StringValue") ||
+               is_a($msg, "Google\Protobuf\BytesValue");
+    }
 }
diff --git a/php/src/Google/Protobuf/Internal/GPBWire.php b/php/src/Google/Protobuf/Internal/GPBWire.php
index f75e0861..e7eec552 100644
--- a/php/src/Google/Protobuf/Internal/GPBWire.php
+++ b/php/src/Google/Protobuf/Internal/GPBWire.php
@@ -117,19 +117,12 @@ class GPBWire
   //        << decode <<
   public static function zigZagEncode32($int32)
   {
-      // Fill high 32 bits.
-      if (PHP_INT_SIZE === 8) {
-          $int32 |= ((($int32 << 32) >> 31) & (0xFFFFFFFF << 32));
+      if (PHP_INT_SIZE == 8) {
+          $trim_int32 = $int32 & 0xFFFFFFFF;
+          return (($trim_int32 << 1) ^ ($int32 << 32 >> 63)) & 0xFFFFFFFF;
+      } else {
+          return ($int32 << 1) ^ ($int32 >> 31);
       }
-
-      $uint32 = ($int32 << 1) ^ ($int32 >> 31);
-
-      // Fill high 32 bits.
-      if (PHP_INT_SIZE === 8) {
-          $uint32 |= ((($uint32 << 32) >> 31) & (0xFFFFFFFF << 32));
-      }
-
-      return $uint32;
   }
 
     public static function zigZagDecode32($uint32)
@@ -177,7 +170,11 @@ class GPBWire
 
     public static function readInt64(&$input, &$value)
     {
-        return $input->readVarint64($value);
+        $success = $input->readVarint64($value);
+        if (PHP_INT_SIZE == 4 && bccomp($value, "9223372036854775807") > 0) {
+            $value = bcsub($value, "18446744073709551616");
+        }
+        return $success;
     }
 
     public static function readUint32(&$input, &$value)
@@ -231,7 +228,11 @@ class GPBWire
 
     public static function readSfixed64(&$input, &$value)
     {
-        return $input->readLittleEndian64($value);
+        $success = $input->readLittleEndian64($value);
+        if (PHP_INT_SIZE == 4 && bccomp($value, "9223372036854775807") > 0) {
+            $value = bcsub($value, "18446744073709551616");
+        }
+        return $success;
     }
 
     public static function readFloat(&$input, &$value)
@@ -298,7 +299,7 @@ class GPBWire
 
     public static function writeInt32(&$output, $value)
     {
-        return $output->writeVarint32($value);
+        return $output->writeVarint32($value, false);
     }
 
     public static function writeInt64(&$output, $value)
@@ -308,7 +309,7 @@ class GPBWire
 
     public static function writeUint32(&$output, $value)
     {
-        return $output->writeVarint32($value);
+        return $output->writeVarint32($value, true);
     }
 
     public static function writeUint64(&$output, $value)
@@ -319,7 +320,7 @@ class GPBWire
     public static function writeSint32(&$output, $value)
     {
         $value = GPBWire::zigZagEncode32($value);
-        return $output->writeVarint64($value);
+        return $output->writeVarint32($value, true);
     }
 
     public static function writeSint64(&$output, $value)
@@ -351,9 +352,9 @@ class GPBWire
     public static function writeBool(&$output, $value)
     {
         if ($value) {
-            return $output->writeVarint32(1);
+            return $output->writeVarint32(1, true);
         } else {
-            return $output->writeVarint32(0);
+            return $output->writeVarint32(0, true);
         }
     }
 
@@ -377,7 +378,7 @@ class GPBWire
     public static function writeBytes(&$output, $value)
     {
         $size = strlen($value);
-        if (!$output->writeVarint32($size)) {
+        if (!$output->writeVarint32($size, true)) {
             return false;
         }
         return $output->writeRaw($value, $size);
@@ -386,7 +387,7 @@ class GPBWire
     public static function writeMessage(&$output, $value)
     {
         $size = $value->byteSize();
-        if (!$output->writeVarint32($size)) {
+        if (!$output->writeVarint32($size, true)) {
             return false;
         }
         return $value->serializeToStream($output);
@@ -403,10 +404,14 @@ class GPBWire
         return self::varint32Size($tag);
     }
 
-    public static function varint32Size($value)
+    public static function varint32Size($value, $sign_extended = false)
     {
         if ($value < 0) {
-            return 5;
+            if ($sign_extended) {
+                return 10;
+            } else {
+                return 5;
+            }
         }
         if ($value < (1 <<  7)) {
             return 1;
@@ -438,7 +443,8 @@ class GPBWire
     public static function varint64Size($value)
     {
         if (PHP_INT_SIZE == 4) {
-            if (bccomp($value, 0) < 0) {
+            if (bccomp($value, 0) < 0 ||
+                bccomp($value, "9223372036854775807") > 0) {
                 return 10;
             }    
             if (bccomp($value, 1 << 7) < 0) {
@@ -574,6 +580,9 @@ class GPBWire
                 }
                 break;
             case GPBType::UINT32:
+                if (PHP_INT_SIZE === 8 && $value < 0) {
+                    $value += 4294967296;
+                }
                 if (!GPBWire::writeUint32($output, $value)) {
                     return false;
                 }
diff --git a/php/src/Google/Protobuf/Internal/GPBWireType.php b/php/src/Google/Protobuf/Internal/GPBWireType.php
new file mode 100644
index 00000000..c1ad370e
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/GPBWireType.php
@@ -0,0 +1,43 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class GPBWireType
+{
+    const VARINT           = 0;
+    const FIXED64          = 1;
+    const LENGTH_DELIMITED = 2;
+    const START_GROUP      = 3;
+    const END_GROUP        = 4;
+    const FIXED32          = 5;
+}
diff --git a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php
index 8e493c2f..f5a65bea 100644
--- a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php
+++ b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo.php
@@ -8,43 +8,48 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes the relationship between generated code and its original source
  * file. A GeneratedCodeInfo message is associated with only one generated
  * source file, but may contain references to different source .proto files.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.GeneratedCodeInfo</code>
+ * Generated from protobuf message <code>google.protobuf.GeneratedCodeInfo</code>
  */
 class GeneratedCodeInfo extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * An Annotation connects some span of text in generated code to an element
      * of its generating .proto file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
      */
     private $annotation;
     private $has_annotation = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\GeneratedCodeInfo\Annotation[]|\Google\Protobuf\Internal\RepeatedField $annotation
+     *           An Annotation connects some span of text in generated code to an element
+     *           of its generating .proto file.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * An Annotation connects some span of text in generated code to an element
      * of its generating .proto file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getAnnotation()
     {
@@ -52,18 +57,20 @@ class GeneratedCodeInfo extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * An Annotation connects some span of text in generated code to an element
      * of its generating .proto file.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;</code>
+     * @param \Google\Protobuf\Internal\GeneratedCodeInfo\Annotation[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setAnnotation(&$var)
+    public function setAnnotation($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\GeneratedCodeInfo_Annotation::class);
-        $this->annotation = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\GeneratedCodeInfo\Annotation::class);
+        $this->annotation = $arr;
         $this->has_annotation = true;
+
+        return $this;
     }
 
     public function hasAnnotation()
diff --git a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo/Annotation.php
index dcc7edfe..09f958d2 100644
--- a/php/src/Google/Protobuf/Internal/GeneratedCodeInfo_Annotation.php
+++ b/php/src/Google/Protobuf/Internal/GeneratedCodeInfo/Annotation.php
@@ -2,73 +2,83 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/protobuf/descriptor.proto
 
-namespace Google\Protobuf\Internal;
+namespace Google\Protobuf\Internal\GeneratedCodeInfo;
 
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.GeneratedCodeInfo.Annotation</code>
+ * Generated from protobuf message <code>google.protobuf.GeneratedCodeInfo.Annotation</code>
  */
-class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
+class Annotation extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Identifies the element in the original source .proto file. This field
      * is formatted the same as SourceCodeInfo.Location.path.
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
      */
     private $path;
     private $has_path = false;
     /**
-     * <pre>
      * Identifies the filesystem path to the original source .proto.
-     * </pre>
      *
-     * <code>optional string source_file = 2;</code>
+     * Generated from protobuf field <code>optional string source_file = 2;</code>
      */
     private $source_file = '';
     private $has_source_file = false;
     /**
-     * <pre>
      * Identifies the starting offset in bytes in the generated code
      * that relates to the identified object.
-     * </pre>
      *
-     * <code>optional int32 begin = 3;</code>
+     * Generated from protobuf field <code>optional int32 begin = 3;</code>
      */
     private $begin = 0;
     private $has_begin = false;
     /**
-     * <pre>
      * Identifies the ending offset in bytes in the generated code that
      * relates to the identified offset. The end offset should be one past
      * the last relevant byte (so the length of the text = end - begin).
-     * </pre>
      *
-     * <code>optional int32 end = 4;</code>
+     * Generated from protobuf field <code>optional int32 end = 4;</code>
      */
     private $end = 0;
     private $has_end = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int[]|\Google\Protobuf\Internal\RepeatedField $path
+     *           Identifies the element in the original source .proto file. This field
+     *           is formatted the same as SourceCodeInfo.Location.path.
+     *     @type string $source_file
+     *           Identifies the filesystem path to the original source .proto.
+     *     @type int $begin
+     *           Identifies the starting offset in bytes in the generated code
+     *           that relates to the identified object.
+     *     @type int $end
+     *           Identifies the ending offset in bytes in the generated code that
+     *           relates to the identified offset. The end offset should be one past
+     *           the last relevant byte (so the length of the text = end - begin).
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Identifies the element in the original source .proto file. This field
      * is formatted the same as SourceCodeInfo.Location.path.
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getPath()
     {
@@ -76,18 +86,20 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the element in the original source .proto file. This field
      * is formatted the same as SourceCodeInfo.Location.path.
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
+     * @param int[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setPath(&$var)
+    public function setPath($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
-        $this->path = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
+        $this->path = $arr;
         $this->has_path = true;
+
+        return $this;
     }
 
     public function hasPath()
@@ -96,11 +108,10 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the filesystem path to the original source .proto.
-     * </pre>
      *
-     * <code>optional string source_file = 2;</code>
+     * Generated from protobuf field <code>optional string source_file = 2;</code>
+     * @return string
      */
     public function getSourceFile()
     {
@@ -108,17 +119,19 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the filesystem path to the original source .proto.
-     * </pre>
      *
-     * <code>optional string source_file = 2;</code>
+     * Generated from protobuf field <code>optional string source_file = 2;</code>
+     * @param string $var
+     * @return $this
      */
     public function setSourceFile($var)
     {
         GPBUtil::checkString($var, True);
         $this->source_file = $var;
         $this->has_source_file = true;
+
+        return $this;
     }
 
     public function hasSourceFile()
@@ -127,12 +140,11 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the starting offset in bytes in the generated code
      * that relates to the identified object.
-     * </pre>
      *
-     * <code>optional int32 begin = 3;</code>
+     * Generated from protobuf field <code>optional int32 begin = 3;</code>
+     * @return int
      */
     public function getBegin()
     {
@@ -140,18 +152,20 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the starting offset in bytes in the generated code
      * that relates to the identified object.
-     * </pre>
      *
-     * <code>optional int32 begin = 3;</code>
+     * Generated from protobuf field <code>optional int32 begin = 3;</code>
+     * @param int $var
+     * @return $this
      */
     public function setBegin($var)
     {
         GPBUtil::checkInt32($var);
         $this->begin = $var;
         $this->has_begin = true;
+
+        return $this;
     }
 
     public function hasBegin()
@@ -160,13 +174,12 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the ending offset in bytes in the generated code that
      * relates to the identified offset. The end offset should be one past
      * the last relevant byte (so the length of the text = end - begin).
-     * </pre>
      *
-     * <code>optional int32 end = 4;</code>
+     * Generated from protobuf field <code>optional int32 end = 4;</code>
+     * @return int
      */
     public function getEnd()
     {
@@ -174,19 +187,21 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies the ending offset in bytes in the generated code that
      * relates to the identified offset. The end offset should be one past
      * the last relevant byte (so the length of the text = end - begin).
-     * </pre>
      *
-     * <code>optional int32 end = 4;</code>
+     * Generated from protobuf field <code>optional int32 end = 4;</code>
+     * @param int $var
+     * @return $this
      */
     public function setEnd($var)
     {
         GPBUtil::checkInt32($var);
         $this->end = $var;
         $this->has_end = true;
+
+        return $this;
     }
 
     public function hasEnd()
@@ -196,3 +211,6 @@ class GeneratedCodeInfo_Annotation extends \Google\Protobuf\Internal\Message
 
 }
 
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Annotation::class, \Google\Protobuf\Internal\GeneratedCodeInfo_Annotation::class);
+
diff --git a/php/src/Google/Protobuf/Internal/GetPublicDescriptorTrait.php b/php/src/Google/Protobuf/Internal/GetPublicDescriptorTrait.php
new file mode 100644
index 00000000..d22bc305
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/GetPublicDescriptorTrait.php
@@ -0,0 +1,41 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+trait GetPublicDescriptorTrait
+{
+    private function getPublicDescriptor($desc)
+    {
+        return is_null($desc) ? null : $desc->getPublicDescriptor();
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/HasPublicDescriptorTrait.php b/php/src/Google/Protobuf/Internal/HasPublicDescriptorTrait.php
new file mode 100644
index 00000000..ed5d1660
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/HasPublicDescriptorTrait.php
@@ -0,0 +1,43 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+trait HasPublicDescriptorTrait
+{
+    private $public_desc;
+
+    public function getPublicDescriptor()
+    {
+        return $this->public_desc;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/MapEntry.php b/php/src/Google/Protobuf/Internal/MapEntry.php
index 926645e1..9c32f1ea 100644
--- a/php/src/Google/Protobuf/Internal/MapEntry.php
+++ b/php/src/Google/Protobuf/Internal/MapEntry.php
@@ -39,7 +39,7 @@ class MapEntry extends Message
     public $key;
     public $value;
 
-    public function setKey(&$key) {
+    public function setKey($key) {
       $this->key = $key;
     }
 
@@ -47,7 +47,7 @@ class MapEntry extends Message
       return $this->key;
     }
 
-    public function setValue(&$value) {
+    public function setValue($value) {
       $this->value = $value;
     }
 
diff --git a/php/src/Google/Protobuf/Internal/MapField.php b/php/src/Google/Protobuf/Internal/MapField.php
index 14ee7ebe..38736dad 100644
--- a/php/src/Google/Protobuf/Internal/MapField.php
+++ b/php/src/Google/Protobuf/Internal/MapField.php
@@ -38,132 +38,6 @@
 namespace Google\Protobuf\Internal;
 
 /**
- * MapFieldIter is used to iterate MapField. It is also need for the foreach
- * syntax.
- */
-class MapFieldIter implements \Iterator
-{
-
-    /**
-     * @ignore
-     */
-    private $container;
-
-    /**
-     * Create iterator instance for MapField.
-     *
-     * @param MapField The MapField instance for which this iterator is
-     * created.
-     * @ignore
-     */
-    public function __construct($container)
-    {
-        $this->container = $container;
-    }
-
-    /**
-     * Reset the status of the iterator
-     *
-     * @return void
-     */
-    public function rewind()
-    {
-        return reset($this->container);
-    }
-
-    /**
-     * Return the element at the current position.
-     *
-     * @return object The element at the current position.
-     */
-    public function current()
-    {
-        return current($this->container);
-    }
-
-    /**
-     * Return the current key.
-     *
-     * @return object The current key.
-     */
-    public function key()
-    {
-        return key($this->container);
-    }
-
-    /**
-     * Move to the next position.
-     *
-     * @return void
-     */
-    public function next()
-    {
-        return next($this->container);
-    }
-
-    /**
-     * Check whether there are more elements to iterate.
-     *
-     * @return bool True if there are more elements to iterate.
-     */
-    public function valid()
-    {
-        return key($this->container) !== null;
-    }
-}
-
-/**
- * @ignore
- */
-function checkKey($key_type, &$key)
-{
-    switch ($key_type) {
-        case GPBType::INT32:
-            GPBUtil::checkInt32($key);
-            break;
-        case GPBType::UINT32:
-            GPBUtil::checkUint32($key);
-            break;
-        case GPBType::INT64:
-            GPBUtil::checkInt64($key);
-            break;
-        case GPBType::UINT64:
-            GPBUtil::checkUint64($key);
-            break;
-        case GPBType::FIXED64:
-            GPBUtil::checkUint64($key);
-            break;
-        case GPBType::FIXED32:
-            GPBUtil::checkUint32($key);
-            break;
-        case GPBType::SFIXED64:
-            GPBUtil::checkInt64($key);
-            break;
-        case GPBType::SFIXED32:
-            GPBUtil::checkInt32($key);
-            break;
-        case GPBType::SINT64:
-            GPBUtil::checkInt64($key);
-            break;
-        case GPBType::SINT32:
-            GPBUtil::checkInt32($key);
-            break;
-        case GPBType::BOOL:
-            GPBUtil::checkBool($key);
-            break;
-        case GPBType::STRING:
-            GPBUtil::checkString($key, true);
-            break;
-        default:
-            var_dump($key_type);
-            trigger_error(
-                "Given type cannot be map key.",
-                E_USER_ERROR);
-            break;
-    }
-}
-
-/**
  * MapField is used by generated protocol message classes to manipulate map
  * fields. It can be used like native PHP array.
  */
@@ -204,6 +78,30 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
     }
 
     /**
+     * @ignore
+     */
+    public function getKeyType()
+    {
+        return $this->key_type;
+    }
+
+    /**
+     * @ignore
+     */
+    public function getValueType()
+    {
+        return $this->value_type;
+    }
+
+    /**
+     * @ignore
+     */
+    public function getValueClass()
+    {
+        return $this->klass;
+    }
+
+    /**
      * Return the element at the given key.
      *
      * This will also be called for: $ele = $arr[$key]
@@ -232,7 +130,7 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
      */
     public function offsetSet($key, $value)
     {
-        checkKey($this->key_type, $key);
+        $this->checkKey($this->key_type, $key);
 
         switch ($this->value_type) {
             case GPBType::INT32:
@@ -260,6 +158,9 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
                 GPBUtil::checkString($value, true);
                 break;
             case GPBType::MESSAGE:
+                if (is_null($value)) {
+                  trigger_error("Map element cannot be null.", E_USER_ERROR);
+                }
                 GPBUtil::checkMessage($value, $this->klass);
                 break;
             default:
@@ -280,7 +181,7 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
      */
     public function offsetUnset($key)
     {
-        checkKey($this->key_type, $key);
+        $this->checkKey($this->key_type, $key);
         unset($this->container[$key]);
     }
 
@@ -295,7 +196,7 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
      */
     public function offsetExists($key)
     {
-        checkKey($this->key_type, $key);
+        $this->checkKey($this->key_type, $key);
         return isset($this->container[$key]);
     }
 
@@ -304,7 +205,7 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
      */
     public function getIterator()
     {
-        return new MapFieldIter($this->container);
+        return new MapFieldIter($this->container, $this->key_type);
     }
 
     /**
@@ -318,4 +219,54 @@ class MapField implements \ArrayAccess, \IteratorAggregate, \Countable
     {
         return count($this->container);
     }
+
+    /**
+     * @ignore
+     */
+    private function checkKey($key_type, &$key)
+    {
+        switch ($key_type) {
+            case GPBType::INT32:
+                GPBUtil::checkInt32($key);
+                break;
+            case GPBType::UINT32:
+                GPBUtil::checkUint32($key);
+                break;
+            case GPBType::INT64:
+                GPBUtil::checkInt64($key);
+                break;
+            case GPBType::UINT64:
+                GPBUtil::checkUint64($key);
+                break;
+            case GPBType::FIXED64:
+                GPBUtil::checkUint64($key);
+                break;
+            case GPBType::FIXED32:
+                GPBUtil::checkUint32($key);
+                break;
+            case GPBType::SFIXED64:
+                GPBUtil::checkInt64($key);
+                break;
+            case GPBType::SFIXED32:
+                GPBUtil::checkInt32($key);
+                break;
+            case GPBType::SINT64:
+                GPBUtil::checkInt64($key);
+                break;
+            case GPBType::SINT32:
+                GPBUtil::checkInt32($key);
+                break;
+            case GPBType::BOOL:
+                GPBUtil::checkBool($key);
+                break;
+            case GPBType::STRING:
+                GPBUtil::checkString($key, true);
+                break;
+            default:
+                trigger_error(
+                    "Given type cannot be map key.",
+                    E_USER_ERROR);
+                break;
+        }
+    }
 }
diff --git a/php/src/Google/Protobuf/Internal/MapFieldIter.php b/php/src/Google/Protobuf/Internal/MapFieldIter.php
new file mode 100644
index 00000000..88e6c8b2
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/MapFieldIter.php
@@ -0,0 +1,124 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * MapField and MapFieldIter are used by generated protocol message classes to
+ * manipulate map fields.
+ */
+
+namespace Google\Protobuf\Internal;
+
+/**
+ * MapFieldIter is used to iterate MapField. It is also need for the foreach
+ * syntax.
+ */
+class MapFieldIter implements \Iterator
+{
+
+    /**
+     * @ignore
+     */
+    private $container;
+
+    /**
+     * Create iterator instance for MapField.
+     *
+     * @param MapField The MapField instance for which this iterator is
+     * created.
+     * @param GPBType Map key type.
+     * @ignore
+     */
+    public function __construct($container, $key_type)
+    {
+        $this->container = $container;
+        $this->key_type = $key_type;
+    }
+
+    /**
+     * Reset the status of the iterator
+     *
+     * @return void
+     */
+    public function rewind()
+    {
+        return reset($this->container);
+    }
+
+    /**
+     * Return the element at the current position.
+     *
+     * @return object The element at the current position.
+     */
+    public function current()
+    {
+        return current($this->container);
+    }
+
+    /**
+     * Return the current key.
+     *
+     * @return object The current key.
+     */
+    public function key()
+    {
+        $key = key($this->container);
+        if ($this->key_type === GPBType::BOOL) {
+            // PHP associative array stores bool as integer for key.
+            return boolval($key);
+        } elseif ($this->key_type === GPBType::STRING) {
+            // PHP associative array stores int string as int for key.
+            return strval($key);
+        } else {
+            return $key;
+        }
+    }
+
+    /**
+     * Move to the next position.
+     *
+     * @return void
+     */
+    public function next()
+    {
+        return next($this->container);
+    }
+
+    /**
+     * Check whether there are more elements to iterate.
+     *
+     * @return bool True if there are more elements to iterate.
+     */
+    public function valid()
+    {
+        return key($this->container) !== null;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/Message.php b/php/src/Google/Protobuf/Internal/Message.php
index ca4fde02..73ac375e 100644
--- a/php/src/Google/Protobuf/Internal/Message.php
+++ b/php/src/Google/Protobuf/Internal/Message.php
@@ -36,14 +36,18 @@
 
 namespace Google\Protobuf\Internal;
 
-use Google\Protobuf\Internal\InputStream;
-use Google\Protobuf\Internal\OutputStream;
+use Google\Protobuf\Internal\CodedInputStream;
+use Google\Protobuf\Internal\CodedOutputStream;
 use Google\Protobuf\Internal\DescriptorPool;
 use Google\Protobuf\Internal\GPBLabel;
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\MapEntry;
 use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\ListValue;
+use Google\Protobuf\Value;
+use Google\Protobuf\Struct;
+use Google\Protobuf\NullValue;
 
 /**
  * Parent class of all proto messages. Users should not instantiate this class
@@ -57,21 +61,40 @@ class Message
      * @ignore
      */
     private $desc;
+    private $unknown = "";
 
     /**
      * @ignore
      */
-    public function __construct($desc = NULL)
+    public function __construct($data = NULL)
     {
         // MapEntry message is shared by all types of map fields, whose
         // descriptors are different from each other. Thus, we cannot find a
         // specific descriptor from the descriptor pool.
-        if (get_class($this) === 'Google\Protobuf\Internal\MapEntry') {
-            $this->desc = $desc;
-            return;
+        if ($this instanceof MapEntry) {
+            $this->initWithDescriptor($data);
+        } else {
+            $this->initWithGeneratedPool();
+            if (is_array($data)) {
+                $this->mergeFromArray($data);
+            } else if (!empty($data)) {
+                throw new \InvalidArgumentException(
+                    'Message constructor must be an array or null.'
+                );
+            }
         }
+    }
+
+    /**
+     * @ignore
+     */
+    private function initWithGeneratedPool()
+    {
         $pool = DescriptorPool::getGeneratedPool();
         $this->desc = $pool->getDescriptorByClassName(get_class($this));
+        if (is_null($this->desc)) {
+            user_error(get_class($this) . " is not found in descriptor pool.");
+        }
         foreach ($this->desc->getField() as $field) {
             $setter = $field->getSetter();
             if ($field->isMap()) {
@@ -139,6 +162,19 @@ class Message
         }
     }
 
+    /**
+     * @ignore
+     */
+    private function initWithDescriptor(Descriptor $desc)
+    {
+        $this->desc = $desc;
+        foreach ($desc->getField() as $field) {
+            $setter = $field->getSetter();
+            $defaultValue = $this->defaultValue($field);
+            $this->$setter($defaultValue);
+        }
+    }
+
     protected function readOneof($number)
     {
         $field = $this->desc->getFieldByNumber($number);
@@ -219,57 +255,123 @@ class Message
     /**
      * @ignore
      */
+    private function skipField($input, $tag)
+    {
+        $number = GPBWire::getTagFieldNumber($tag);
+        if ($number === 0) {
+            throw new GPBDecodeException("Illegal field number zero.");
+        }
+
+        $start = $input->current();
+        switch (GPBWire::getTagWireType($tag)) {
+            case GPBWireType::VARINT:
+                $uint64 = 0;
+                if (!$input->readVarint64($uint64)) {
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside varint.");
+                }
+                break;
+            case GPBWireType::FIXED64:
+                $uint64 = 0;
+                if (!$input->readLittleEndian64($uint64)) {
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside fixed64.");
+                }
+                break;
+            case GPBWireType::FIXED32:
+                $uint32 = 0;
+                if (!$input->readLittleEndian32($uint32)) {
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside fixed32.");
+                }
+                break;
+            case GPBWireType::LENGTH_DELIMITED:
+                $length = 0;
+                if (!$input->readVarint32($length)) {
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside length.");
+                }
+                $data = NULL;
+                if (!$input->readRaw($length, $data)) {
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside length delimited data.");
+                }
+                break;
+            case GPBWireType::START_GROUP:
+            case GPBWireType::END_GROUP:
+                throw new GPBDecodeException("Unexpected wire type.");
+            default:
+                throw new GPBDecodeException("Unexpected wire type.");
+        }
+        $end = $input->current();
+
+        $bytes = str_repeat(chr(0), CodedOutputStream::MAX_VARINT64_BYTES);
+        $size = CodedOutputStream::writeVarintToArray($tag, $bytes, true);
+        $this->unknown .= substr($bytes, 0, $size) . $input->substr($start, $end);
+    }
+
+    /**
+     * @ignore
+     */
     private static function parseFieldFromStreamNoTag($input, $field, &$value)
     {
         switch ($field->getType()) {
             case GPBType::DOUBLE:
                 if (!GPBWire::readDouble($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside double field.");
                 }
                 break;
             case GPBType::FLOAT:
                 if (!GPBWire::readFloat($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside float field.");
                 }
                 break;
             case GPBType::INT64:
                 if (!GPBWire::readInt64($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside int64 field.");
                 }
                 break;
             case GPBType::UINT64:
                 if (!GPBWire::readUint64($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside uint64 field.");
                 }
                 break;
             case GPBType::INT32:
                 if (!GPBWire::readInt32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside int32 field.");
                 }
                 break;
             case GPBType::FIXED64:
                 if (!GPBWire::readFixed64($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside fixed64 field.");
                 }
                 break;
             case GPBType::FIXED32:
                 if (!GPBWire::readFixed32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside fixed32 field.");
                 }
                 break;
             case GPBType::BOOL:
                 if (!GPBWire::readBool($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside bool field.");
                 }
                 break;
             case GPBType::STRING:
                 // TODO(teboring): Add utf-8 check.
                 if (!GPBWire::readString($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside string field.");
                 }
                 break;
             case GPBType::GROUP:
-                echo "GROUP\xA";
                 trigger_error("Not implemented.", E_ERROR);
                 break;
             case GPBType::MESSAGE:
@@ -280,43 +382,51 @@ class Message
                     $value = new $klass;
                 }
                 if (!GPBWire::readMessage($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside message.");
                 }
                 break;
             case GPBType::BYTES:
                 if (!GPBWire::readString($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside bytes field.");
                 }
                 break;
             case GPBType::UINT32:
                 if (!GPBWire::readUint32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside uint32 field.");
                 }
                 break;
             case GPBType::ENUM:
                 // TODO(teboring): Check unknown enum value.
                 if (!GPBWire::readInt32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside enum field.");
                 }
                 break;
             case GPBType::SFIXED32:
                 if (!GPBWire::readSfixed32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside sfixed32 field.");
                 }
                 break;
             case GPBType::SFIXED64:
                 if (!GPBWire::readSfixed64($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside sfixed64 field.");
                 }
                 break;
             case GPBType::SINT32:
                 if (!GPBWire::readSint32($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside sint32 field.");
                 }
                 break;
             case GPBType::SINT64:
                 if (!GPBWire::readSint64($input, $value)) {
-                    return false;
+                    throw new GPBDecodeException(
+                        "Unexpected EOF inside sint64 field.");
                 }
                 break;
             default:
@@ -332,53 +442,52 @@ class Message
     private function parseFieldFromStream($tag, $input, $field)
     {
         $value = null;
-        $field_type = $field->getType();
 
-        $value_format = GPBWire::UNKNOWN;
-        if (GPBWire::getTagWireType($tag) ===
-            GPBWire::getWireType($field_type)) {
+        if (is_null($field)) {
+            $value_format = GPBWire::UNKNOWN;
+        } elseif (GPBWire::getTagWireType($tag) ===
+            GPBWire::getWireType($field->getType())) {
             $value_format = GPBWire::NORMAL_FORMAT;
         } elseif ($field->isPackable() &&
             GPBWire::getTagWireType($tag) ===
             GPBWire::WIRETYPE_LENGTH_DELIMITED) {
             $value_format = GPBWire::PACKED_FORMAT;
+        } else {
+            // the wire type doesn't match. Put it in our unknown field set.
+            $value_format = GPBWire::UNKNOWN;
         }
 
-        if ($value_format === GPBWire::NORMAL_FORMAT) {
-            if (!self::parseFieldFromStreamNoTag($input, $field, $value)) {
-                return false;
-            }
+        if ($value_format === GPBWire::UNKNOWN) {
+            $this->skipField($input, $tag);
+            return;
+        } elseif ($value_format === GPBWire::NORMAL_FORMAT) {
+            self::parseFieldFromStreamNoTag($input, $field, $value);
         } elseif ($value_format === GPBWire::PACKED_FORMAT) {
             $length = 0;
             if (!GPBWire::readInt32($input, $length)) {
-                return false;
+                throw new GPBDecodeException(
+                    "Unexpected EOF inside packed length.");
             }
             $limit = $input->pushLimit($length);
             $getter = $field->getGetter();
             while ($input->bytesUntilLimit() > 0) {
-                if (!self::parseFieldFromStreamNoTag($input, $field, $value)) {
-                    return false;
-                }
-                $this->$getter()[] = $value;
+                self::parseFieldFromStreamNoTag($input, $field, $value);
+                $this->appendHelper($field, $value);
             }
             $input->popLimit($limit);
-            return true;
+            return;
         } else {
-            return false;
+            return;
         }
 
         if ($field->isMap()) {
-            $getter = $field->getGetter();
-            $this->$getter()[$value->getKey()] = $value->getValue();
+            $this->kvUpdateHelper($field, $value->getKey(), $value->getValue());
         } else if ($field->isRepeated()) {
-            $getter = $field->getGetter();
-            $this->$getter()[] = $value;
+            $this->appendHelper($field, $value);
         } else {
             $setter = $field->getSetter();
             $this->$setter($value);
         }
-
-        return true;
     }
 
     /**
@@ -387,6 +496,7 @@ class Message
      */
     public function clear()
     {
+        $this->unknown = "";
         foreach ($this->desc->getField() as $field) {
             $setter = $field->getSetter();
             if ($field->isMap()) {
@@ -491,6 +601,43 @@ class Message
     }
 
     /**
+     * Clear all unknown fields previously parsed.
+     * @return null.
+     */
+    public function discardUnknownFields()
+    {
+        $this->unknown = "";
+        foreach ($this->desc->getField() as $field) {
+            if ($field->getType() != GPBType::MESSAGE) {
+                continue;
+            }
+            if ($field->isMap()) {
+                $value_field = $field->getMessageType()->getFieldByNumber(2);
+                if ($value_field->getType() != GPBType::MESSAGE) {
+                    continue;
+                }
+                $getter = $field->getGetter();
+                $map = $this->$getter();
+                foreach ($map as $key => $value) {
+                    $value->discardUnknownFields();
+                }
+            } else if ($field->getLabel() === GPBLabel::REPEATED) {
+                $getter = $field->getGetter();
+                $arr = $this->$getter();
+                foreach ($arr as $sub) {
+                    $sub->discardUnknownFields();
+                }
+            } else if ($field->getLabel() === GPBLabel::OPTIONAL) {
+                $getter = $field->getGetter();
+                $sub = $this->$getter();
+                if (!is_null($sub)) {
+                    $sub->discardUnknownFields();
+                }
+            }
+        }
+    }
+
+    /**
      * Merges the contents of the specified message into current message.
      *
      * This method merges the contents of the specified message into the
@@ -505,57 +652,58 @@ class Message
      */
     public function mergeFrom($msg)
     {
-      if (get_class($this) !== get_class($msg)) {
-          user_error("Cannot merge messages with different class.");
-          return;
-      }
-
-      foreach ($this->desc->getField() as $field) {
-          $setter = $field->getSetter();
-          $getter = $field->getGetter();
-          if ($field->isMap()) {
-              if (count($msg->$getter()) != 0) {
-                  $value_field = $field->getMessageType()->getFieldByNumber(2);
-                  foreach ($msg->$getter() as $key => $value) {
-                      if ($value_field->getType() == GPBType::MESSAGE) {
-                          $klass = $value_field->getMessageType()->getClass();
-                          $copy = new $klass;
-                          $copy->mergeFrom($value);
-                          $this->$getter()[$key] = $copy;
-                      } else {
-                          $this->$getter()[$key] = $value;
-                      }
-                  }
-              }
-          } else if ($field->getLabel() === GPBLabel::REPEATED) {
-              if (count($msg->$getter()) != 0) {
-                  foreach ($msg->$getter() as $tmp) {
-                      if ($field->getType() == GPBType::MESSAGE) {
-                          $klass = $field->getMessageType()->getClass();
-                          $copy = new $klass;
-                          $copy->mergeFrom($tmp);
-                          $this->$getter()[] = $copy;
-                      } else {
-                          $this->$getter()[] = $tmp;
-                      }
-                  }
-              }
-          } else if ($field->getLabel() === GPBLabel::OPTIONAL) {
-              if($msg->$getter() !== $this->defaultValue($field)) {
-                  $tmp = $msg->$getter();
-                  if ($field->getType() == GPBType::MESSAGE) {
-                      if (is_null($this->$getter())) {
-                          $klass = $field->getMessageType()->getClass();
-                          $new_msg = new $klass;
-                          $this->$setter($new_msg);
-                      }
-                      $this->$getter()->mergeFrom($tmp);
-                  } else {
-                      $this->$setter($tmp);
-                  }
-              }
-          }
-      }
+        if (get_class($this) !== get_class($msg)) {
+            user_error("Cannot merge messages with different class.");
+            return;
+        }
+
+        foreach ($this->desc->getField() as $field) {
+            $setter = $field->getSetter();
+            $getter = $field->getGetter();
+            if ($field->isMap()) {
+                if (count($msg->$getter()) != 0) {
+                    $value_field = $field->getMessageType()->getFieldByNumber(2);
+                    foreach ($msg->$getter() as $key => $value) {
+                        if ($value_field->getType() == GPBType::MESSAGE) {
+                            $klass = $value_field->getMessageType()->getClass();
+                            $copy = new $klass;
+                            $copy->mergeFrom($value);
+
+                            $this->kvUpdateHelper($field, $key, $copy);
+                        } else {
+                            $this->kvUpdateHelper($field, $key, $value);
+                        }
+                    }
+                }
+            } else if ($field->getLabel() === GPBLabel::REPEATED) {
+                if (count($msg->$getter()) != 0) {
+                    foreach ($msg->$getter() as $tmp) {
+                        if ($field->getType() == GPBType::MESSAGE) {
+                            $klass = $field->getMessageType()->getClass();
+                            $copy = new $klass;
+                            $copy->mergeFrom($tmp);
+                            $this->appendHelper($field, $copy);
+                        } else {
+                            $this->appendHelper($field, $tmp);
+                        }
+                    }
+                }
+            } else if ($field->getLabel() === GPBLabel::OPTIONAL) {
+                if($msg->$getter() !== $this->defaultValue($field)) {
+                    $tmp = $msg->$getter();
+                    if ($field->getType() == GPBType::MESSAGE) {
+                        if (is_null($this->$getter())) {
+                            $klass = $field->getMessageType()->getClass();
+                            $new_msg = new $klass;
+                            $this->$setter($new_msg);
+                        }
+                        $this->$getter()->mergeFrom($tmp);
+                    } else {
+                        $this->$setter($tmp);
+                    }
+                }
+            }
+        }
     }
 
     /**
@@ -567,15 +715,34 @@ class Message
      * specified message.
      *
      * @param string $data Binary protobuf data.
-     * @return bool Return true on success.
+     * @return null.
+     * @throws Exception Invalid data.
      */
     public function mergeFromString($data)
     {
-        $input = new InputStream($data);
+        $input = new CodedInputStream($data);
         $this->parseFromStream($input);
     }
 
     /**
+     * Parses a json string to protobuf message.
+     *
+     * This function takes a string in the json wire format, matching the
+     * encoding output by serializeToJsonString().
+     * See mergeFrom() for merging behavior, if the field is already set in the
+     * specified message.
+     *
+     * @param string $data Json protobuf data.
+     * @return null.
+     * @throws Exception Invalid data.
+     */
+    public function mergeFromJsonString($data)
+    {
+        $input = new RawInputStream($data);
+        $this->parseFromJsonStream($input);
+    }
+
+    /**
      * @ignore
      */
     public function parseFromStream($input)
@@ -590,13 +757,396 @@ class Message
             $number = GPBWire::getTagFieldNumber($tag);
             $field = $this->desc->getFieldByNumber($number);
 
-            // Check whether we retrieved a known field
-            if ($field === NULL) {
-              continue;
+            $this->parseFieldFromStream($tag, $input, $field);
+        }
+    }
+
+    private function convertJsonValueToProtoValue(
+        $value,
+        $field,
+        $is_map_key = false)
+    {
+        switch ($field->getType()) {
+            case GPBType::MESSAGE:
+                $klass = $field->getMessageType()->getClass();
+                $submsg = new $klass;
+
+                if (is_a($submsg, "Google\Protobuf\Duration")) {
+                    if (is_null($value)) {
+                        return $this->defaultValue($field);
+                    } else if (!is_string($value)) {
+                        throw new GPBDecodeException("Expect string.");
+                    }
+                    return GPBUtil::parseDuration($value);
+                } else if ($field->isTimestamp()) {
+                    if (is_null($value)) {
+                        return $this->defaultValue($field);
+                    } else if (!is_string($value)) {
+                        throw new GPBDecodeException("Expect string.");
+                    }
+                    try {
+                        $timestamp = GPBUtil::parseTimestamp($value);
+                    } catch (\Exception $e) {
+                        throw new GPBDecodeException(
+                            "Invalid RFC 3339 timestamp: ".$e->getMessage());
+                    }
+
+                    $submsg->setSeconds($timestamp->getSeconds());
+                    $submsg->setNanos($timestamp->getNanos());
+                } else if (is_a($submsg, "Google\Protobuf\FieldMask")) {
+                    if (is_null($value)) {
+                        return $this->defaultValue($field);
+                    }
+                    try {
+                        return GPBUtil::parseFieldMask($value);
+                    } catch (\Exception $e) {
+                        throw new GPBDecodeException(
+                            "Invalid FieldMask: ".$e->getMessage());
+                    }
+                } else {
+                    if (is_null($value) &&
+                        !is_a($submsg, "Google\Protobuf\Value")) {
+                        return $this->defaultValue($field);
+                    }
+                    if (GPBUtil::hasSpecialJsonMapping($submsg)) {
+                    } elseif (!is_object($value) && !is_array($value)) {
+                        throw new GPBDecodeException("Expect message.");
+                    }
+                    $submsg->mergeFromJsonArray($value);
+                }
+                return $submsg;
+            case GPBType::ENUM:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (is_integer($value)) {
+                    return $value;
+                }
+                $enum_value = $field->getEnumType()->getValueByName($value);
+                if (!is_null($enum_value)) {
+                    return $enum_value->getNumber();
+                }
+                throw new GPBDecodeException(
+                        "Enum field only accepts integer or enum value name");
+            case GPBType::STRING:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_string($value)) {
+                    throw new GPBDecodeException(
+                        "String field only accepts string value");
+                }
+                return $value;
+            case GPBType::BYTES:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_string($value)) {
+                    throw new GPBDecodeException(
+                        "Byte field only accepts string value");
+                }
+                $proto_value = base64_decode($value, true);
+                if ($proto_value === false) {
+                    throw new GPBDecodeException("Invalid base64 characters");
+                }
+                return $proto_value;
+            case GPBType::BOOL:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if ($is_map_key) {
+                    if ($value === "true") {
+                        return true;
+                    }
+                    if ($value === "false") {
+                        return false;
+                    }
+                    throw new GPBDecodeException(
+                        "Bool field only accepts bool value");
+                }
+                if (!is_bool($value)) {
+                    throw new GPBDecodeException(
+                        "Bool field only accepts bool value");
+                }
+                return $value;
+            case GPBType::FLOAT:
+            case GPBType::DOUBLE:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if ($value === "Infinity") {
+                    return INF;
+                }
+                if ($value === "-Infinity") {
+                    return -INF;
+                }
+                if ($value === "NaN") {
+                    return NAN;
+                }
+                return $value;
+            case GPBType::INT32:
+            case GPBType::SINT32:
+            case GPBType::SFIXED32:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_numeric($value)) {
+                   throw new GPBDecodeException(
+                       "Invalid data type for int32 field");
+                }
+                if (bccomp($value, "2147483647") > 0) {
+                   throw new GPBDecodeException(
+                       "Int32 too large");
+                }
+                if (bccomp($value, "-2147483648") < 0) {
+                   throw new GPBDecodeException(
+                       "Int32 too small");
+                }
+                return $value;
+            case GPBType::UINT32:
+            case GPBType::FIXED32:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_numeric($value)) {
+                   throw new GPBDecodeException(
+                       "Invalid data type for uint32 field");
+                }
+                if (bccomp($value, 4294967295) > 0) {
+                    throw new GPBDecodeException(
+                        "Uint32 too large");
+                }
+                return $value;
+            case GPBType::INT64:
+            case GPBType::SINT64:
+            case GPBType::SFIXED64:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_numeric($value)) {
+                   throw new GPBDecodeException(
+                       "Invalid data type for int64 field");
+                }
+                if (bccomp($value, "9223372036854775807") > 0) {
+                    throw new GPBDecodeException(
+                        "Int64 too large");
+                }
+                if (bccomp($value, "-9223372036854775808") < 0) {
+                    throw new GPBDecodeException(
+                        "Int64 too small");
+                }
+                return $value;
+            case GPBType::UINT64:
+            case GPBType::FIXED64:
+                if (is_null($value)) {
+                    return $this->defaultValue($field);
+                }
+                if (!is_numeric($value)) {
+                   throw new GPBDecodeException(
+                       "Invalid data type for int64 field");
+                }
+                if (bccomp($value, "18446744073709551615") > 0) {
+                    throw new GPBDecodeException(
+                        "Uint64 too large");
+                }
+                if (bccomp($value, "9223372036854775807") > 0) {
+                    $value = bcsub($value, "18446744073709551616");
+                }
+                return $value;
+            default:
+                return $value;
+        }
+    }
+
+    /**
+     * Populates the message from a user-supplied PHP array. Array keys
+     * correspond to Message properties and nested message properties.
+     *
+     * Example:
+     * ```
+     * $message->mergeFromArray([
+     *     'name' => 'This is a message name',
+     *     'interval' => [
+     *          'startTime' => time() - 60,
+     *          'endTime' => time(),
+     *     ]
+     * ]);
+     * ```
+     *
+     * @param array $array An array containing message properties and values.
+     * @return null.
+     * @throws Exception Invalid data.
+     */
+    protected function mergeFromArray(array $array)
+    {
+        // Just call the setters for the field names
+        foreach ($array as $key => $value) {
+            $field = $this->desc->getFieldByName($key);
+            if (is_null($field)) {
+                throw new \UnexpectedValueException(
+                    'Invalid message property: ' . $key);
             }
+            $setter = $field->getSetter();
+            $this->$setter($value);
+        }
+    }
 
-            if (!$this->parseFieldFromStream($tag, $input, $field)) {
-                return false;
+    protected function mergeFromJsonArray($array)
+    {
+        if (is_a($this, "Google\Protobuf\Any")) {
+            $this->clear();
+            $this->setTypeUrl($array["@type"]);
+            $msg = $this->unpack();
+            if (GPBUtil::hasSpecialJsonMapping($msg)) {
+                $msg->mergeFromJsonArray($array["value"]);
+            } else {
+                unset($array["@type"]);
+                $msg->mergeFromJsonArray($array);
+            }
+            $this->setValue($msg->serializeToString());
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\DoubleValue") ||
+            is_a($this, "Google\Protobuf\FloatValue")  ||
+            is_a($this, "Google\Protobuf\Int64Value")  ||
+            is_a($this, "Google\Protobuf\UInt64Value") ||
+            is_a($this, "Google\Protobuf\Int32Value")  ||
+            is_a($this, "Google\Protobuf\UInt32Value") ||
+            is_a($this, "Google\Protobuf\BoolValue")   ||
+            is_a($this, "Google\Protobuf\StringValue")) {
+            $this->setValue($array);
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\BytesValue")) {
+            $this->setValue(base64_decode($array));
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\Duration")) {
+            $this->mergeFrom(GPBUtil::parseDuration($array));
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\FieldMask")) {
+            $this->mergeFrom(GPBUtil::parseFieldMask($array));
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\Timestamp")) {
+            $this->mergeFrom(GPBUtil::parseTimestamp($array));
+            return;
+        }
+        if (is_a($this, "Google\Protobuf\Struct")) {
+            $fields = $this->getFields();
+            foreach($array as $key => $value) {
+                $v = new Value();
+                $v->mergeFromJsonArray($value);
+                $fields[$key] = $v;
+            }
+        }
+        if (is_a($this, "Google\Protobuf\Value")) {
+            if (is_bool($array)) {
+                $this->setBoolValue($array);
+            } elseif (is_string($array)) {
+                $this->setStringValue($array);
+            } elseif (is_null($array)) {
+                $this->setNullValue(0);
+            } elseif (is_double($array) || is_integer($array)) {
+                $this->setNumberValue($array);
+            } elseif (is_array($array)) {
+                if (array_values($array) !== $array) {
+                    // Associative array
+                    $struct_value = $this->getStructValue();
+                    if (is_null($struct_value)) {
+                        $struct_value = new Struct();
+                        $this->setStructValue($struct_value);
+                    }
+                    foreach ($array as $key => $v) {
+                        $value = new Value();
+                        $value->mergeFromJsonArray($v);
+                        $values = $struct_value->getFields();
+                        $values[$key]= $value;
+                    }
+                } else {
+                    // Array
+                    $list_value = $this->getListValue();
+                    if (is_null($list_value)) {
+                        $list_value = new ListValue();
+                        $this->setListValue($list_value);
+                    }
+                    foreach ($array as $v) {
+                        $value = new Value();
+                        $value->mergeFromJsonArray($v);
+                        $values = $list_value->getValues();
+                        $values[]= $value;
+                    }
+                }
+            } else {
+                throw new GPBDecodeException("Invalid type for Value.");
+            }
+            return;
+        }
+        $this->mergeFromArrayJsonImpl($array);
+    }
+
+    private function mergeFromArrayJsonImpl($array)
+    {
+        foreach ($array as $key => $value) {
+            $field = $this->desc->getFieldByJsonName($key);
+            if (is_null($field)) {
+                $field = $this->desc->getFieldByName($key);
+                if (is_null($field)) {
+                    continue;
+                }
+            }
+            if ($field->isMap()) {
+                if (is_null($value)) {
+                    continue;
+                }
+                $key_field = $field->getMessageType()->getFieldByNumber(1);
+                $value_field = $field->getMessageType()->getFieldByNumber(2);
+                foreach ($value as $tmp_key => $tmp_value) {
+                    if (is_null($tmp_value)) {
+                        throw new \Exception(
+                            "Map value field element cannot be null.");
+                    }
+                    $proto_key = $this->convertJsonValueToProtoValue(
+                        $tmp_key,
+                        $key_field,
+                        true);
+                    $proto_value = $this->convertJsonValueToProtoValue(
+                        $tmp_value,
+                        $value_field);
+                    self::kvUpdateHelper($field, $proto_key, $proto_value);
+                }
+            } else if ($field->isRepeated()) {
+                if (is_null($value)) {
+                    continue;
+                }
+                foreach ($value as $tmp) {
+                    if (is_null($tmp)) {
+                        throw new \Exception(
+                            "Repeated field elements cannot be null.");
+                    }
+                    $proto_value = $this->convertJsonValueToProtoValue(
+                        $tmp,
+                        $field);
+                    self::appendHelper($field, $proto_value);
+                }
+            } else {
+                $setter = $field->getSetter();
+                $proto_value = $this->convertJsonValueToProtoValue(
+                    $value,
+                    $field);
+                if ($field->getType() === GPBType::MESSAGE) {
+                    if (is_null($proto_value)) {
+                        continue;
+                    }
+                    $getter = $field->getGetter();
+                    $submsg = $this->$getter();
+                    if (!is_null($submsg)) {
+                        $submsg->mergeFrom($proto_value);
+                        continue;
+                    }
+                }
+                $this->$setter($proto_value);
             }
         }
     }
@@ -604,6 +1154,23 @@ class Message
     /**
      * @ignore
      */
+    public function parseFromJsonStream($input)
+    {
+        $array = json_decode($input->getData(), true, 512, JSON_BIGINT_AS_STRING);
+        if (is_null($array)) {
+            throw new GPBDecodeException(
+                "Cannot decode json string.");
+        }
+        try {
+            $this->mergeFromJsonArray($array);
+        } catch (\Exception $e) {
+            throw new GPBDecodeException($e->getMessage());
+        }
+    }
+
+    /**
+     * @ignore
+     */
     private function serializeSingularFieldToStream($field, &$output)
     {
         if (!$this->existField($field)) {
@@ -640,7 +1207,7 @@ class Message
             foreach ($values as $value) {
                 $size += $this->fieldDataOnlyByteSize($field, $value);
             }
-            if (!$output->writeVarint32($size)) {
+            if (!$output->writeVarint32($size, true)) {
                 return false;
             }
         }
@@ -701,6 +1268,17 @@ class Message
     /**
      * @ignore
      */
+    private function serializeFieldToJsonStream(&$output, $field)
+    {
+        $getter = $field->getGetter();
+        $values = $this->$getter();
+        return GPBJsonWire::serializeFieldToStream(
+            $values, $field, $output, !GPBUtil::hasSpecialJsonMapping($this));
+    }
+
+    /**
+     * @ignore
+     */
     public function serializeToStream(&$output)
     {
         $fields = $this->desc->getField();
@@ -709,6 +1287,80 @@ class Message
                 return false;
             }
         }
+        $output->writeRaw($this->unknown, strlen($this->unknown));
+        return true;
+    }
+
+    /**
+     * @ignore
+     */
+    public function serializeToJsonStream(&$output)
+    {
+        if (is_a($this, 'Google\Protobuf\Any')) {
+            $output->writeRaw("{", 1);
+            $type_field = $this->desc->getFieldByNumber(1);
+            $value_msg = $this->unpack();
+
+            // Serialize type url.
+            $output->writeRaw("\"@type\":", 8);
+            $output->writeRaw("\"", 1);
+            $output->writeRaw($this->getTypeUrl(), strlen($this->getTypeUrl()));
+            $output->writeRaw("\"", 1);
+
+            // Serialize value
+            if (GPBUtil::hasSpecialJsonMapping($value_msg)) {
+                $output->writeRaw(",\"value\":", 9);
+                $value_msg->serializeToJsonStream($output);
+            } else {
+                $value_fields = $value_msg->desc->getField();
+                foreach ($value_fields as $field) {
+                    if ($value_msg->existField($field)) {
+                        $output->writeRaw(",", 1);
+                        if (!$value_msg->serializeFieldToJsonStream($output, $field)) {
+                            return false;
+                        }
+                    }
+                }
+            }
+
+            $output->writeRaw("}", 1);
+        } elseif (is_a($this, 'Google\Protobuf\FieldMask')) {
+            $field_mask = GPBUtil::formatFieldMask($this);
+            $output->writeRaw("\"", 1);
+            $output->writeRaw($field_mask, strlen($field_mask));
+            $output->writeRaw("\"", 1);
+        } elseif (is_a($this, 'Google\Protobuf\Duration')) {
+            $duration = GPBUtil::formatDuration($this) . "s";
+            $output->writeRaw("\"", 1);
+            $output->writeRaw($duration, strlen($duration));
+            $output->writeRaw("\"", 1);
+        } elseif (get_class($this) === 'Google\Protobuf\Timestamp') {
+            $timestamp = GPBUtil::formatTimestamp($this);
+            $timestamp = json_encode($timestamp);
+            $output->writeRaw($timestamp, strlen($timestamp));
+        } else {
+            if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                $output->writeRaw("{", 1);
+            }
+            $fields = $this->desc->getField();
+            $first = true;
+            foreach ($fields as $field) {
+                if ($this->existField($field) ||
+                    GPBUtil::hasJsonValue($this)) {
+                    if ($first) {
+                        $first = false;
+                    } else {
+                        $output->writeRaw(",", 1);
+                    }
+                    if (!$this->serializeFieldToJsonStream($output, $field)) {
+                        return false;
+                    }
+                }
+            }
+            if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                $output->writeRaw("}", 1);
+            }
+        }
         return true;
     }
 
@@ -718,19 +1370,43 @@ class Message
      */
     public function serializeToString()
     {
-        $output = new OutputStream($this->byteSize());
+        $output = new CodedOutputStream($this->byteSize());
         $this->serializeToStream($output);
         return $output->getData();
     }
 
     /**
+     * Serialize the message to json string.
+     * @return string Serialized json protobuf data.
+     */
+    public function serializeToJsonString()
+    {
+        $output = new CodedOutputStream($this->jsonByteSize());
+        $this->serializeToJsonStream($output);
+        return $output->getData();
+    }
+
+    /**
      * @ignore
      */
     private function existField($field)
     {
+        $oneof_index = $field->getOneofIndex();
+        if ($oneof_index !== -1) {
+            $oneof = $this->desc->getOneofDecl()[$oneof_index];
+            $oneof_name = $oneof->getName();
+            return $this->$oneof_name->getNumber() === $field->getNumber();
+        }
+
         $getter = $field->getGetter();
-        $value = $this->$getter();
-        return $value !== $this->defaultValue($field);
+        $values = $this->$getter();
+        if ($field->isMap()) {
+            return count($values) !== 0;
+        } elseif ($field->isRepeated()) {
+            return count($values) !== 0;
+        } else {
+            return $values !== $this->defaultValue($field);
+        }
     }
 
     /**
@@ -772,9 +1448,11 @@ class Message
             case GPBType::SFIXED64:
                 $size += 8;
                 break;
-            case GPBType::UINT32:
             case GPBType::INT32:
             case GPBType::ENUM:
+                $size += GPBWire::varint32Size($value, true);
+                break;
+            case GPBType::UINT32:
                 $size += GPBWire::varint32Size($value);
                 break;
             case GPBType::UINT64:
@@ -811,6 +1489,111 @@ class Message
     /**
      * @ignore
      */
+    private function fieldDataOnlyJsonByteSize($field, $value)
+    {
+        $size = 0;
+
+        switch ($field->getType()) {
+            case GPBType::SFIXED32:
+            case GPBType::SINT32:
+            case GPBType::INT32:
+                $size += strlen(strval($value));
+                break;
+            case GPBType::FIXED32:
+            case GPBType::UINT32:
+                if ($value < 0) {
+                    $value = bcadd($value, "4294967296");
+                }
+                $size += strlen(strval($value));
+                break;
+            case GPBType::FIXED64:
+            case GPBType::UINT64:
+                if ($value < 0) {
+                    $value = bcadd($value, "18446744073709551616");
+                }
+                // Intentional fall through.
+            case GPBType::SFIXED64:
+            case GPBType::INT64:
+            case GPBType::SINT64:
+                $size += 2;  // size for ""
+                $size += strlen(strval($value));
+                break;
+            case GPBType::FLOAT:
+                if (is_nan($value)) {
+                    $size += strlen("NaN") + 2;
+                } elseif ($value === INF) {
+                    $size += strlen("Infinity") + 2;
+                } elseif ($value === -INF) {
+                    $size += strlen("-Infinity") + 2;
+                } else {
+                    $size += strlen(sprintf("%.8g", $value));
+                }
+                break;
+            case GPBType::DOUBLE:
+                if (is_nan($value)) {
+                    $size += strlen("NaN") + 2;
+                } elseif ($value === INF) {
+                    $size += strlen("Infinity") + 2;
+                } elseif ($value === -INF) {
+                    $size += strlen("-Infinity") + 2;
+                } else {
+                    $size += strlen(sprintf("%.17g", $value));
+                }
+                break;
+            case GPBType::ENUM:
+                $enum_desc = $field->getEnumType();
+                if ($enum_desc->getClass() === "Google\Protobuf\NullValue") {
+                    $size += 4;
+                    break;
+                }
+                $enum_value_desc = $enum_desc->getValueByNumber($value);
+                if (!is_null($enum_value_desc)) {
+                    $size += 2;  // size for ""
+                    $size += strlen($enum_value_desc->getName());
+                } else {
+                    $str_value = strval($value);
+                    $size += strlen($str_value);
+                }
+                break;
+            case GPBType::BOOL:
+                if ($value) {
+                    $size += 4;
+                } else {
+                    $size += 5;
+                }
+                break;
+            case GPBType::STRING:
+                $value = json_encode($value);
+                $size += strlen($value);
+                break;
+            case GPBType::BYTES:
+                # if (is_a($this, "Google\Protobuf\BytesValue")) {
+                #     $size += strlen(json_encode($value));
+                # } else {
+                #     $size += strlen(base64_encode($value));
+                #     $size += 2;  // size for \"\"
+                # }
+                $size += strlen(base64_encode($value));
+                $size += 2;  // size for \"\"
+                break;
+            case GPBType::MESSAGE:
+                $size += $value->jsonByteSize();
+                break;
+#             case GPBType::GROUP:
+#                 // TODO(teboring): Add support.
+#                 user_error("Unsupported type.");
+#                 break;
+            default:
+                user_error("Unsupported type " . $field->getType());
+                return 0;
+        }
+
+        return $size;
+    }
+
+    /**
+     * @ignore
+     */
     private function fieldByteSize($field)
     {
         $size = 0;
@@ -825,12 +1608,18 @@ class Message
                 $value_field = $message_type->getFieldByNumber(2);
                 foreach ($values as $key => $value) {
                     $data_size = 0;
-                    $data_size += $this->fieldDataOnlyByteSize($key_field, $key);
-                    $data_size += $this->fieldDataOnlyByteSize(
-                        $value_field,
-                        $value);
-                    $data_size += GPBWire::tagSize($key_field);
-                    $data_size += GPBWire::tagSize($value_field);
+                    if ($key != $this->defaultValue($key_field)) {
+                        $data_size += $this->fieldDataOnlyByteSize(
+                            $key_field,
+                            $key);
+                        $data_size += GPBWire::tagSize($key_field);
+                    }
+                    if ($value != $this->defaultValue($value_field)) {
+                        $data_size += $this->fieldDataOnlyByteSize(
+                            $value_field,
+                            $value);
+                        $data_size += GPBWire::tagSize($value_field);
+                    }
                     $size += GPBWire::varint32Size($data_size) + $data_size;
                 }
             }
@@ -866,6 +1655,77 @@ class Message
     /**
      * @ignore
      */
+    private function fieldJsonByteSize($field)
+    {
+        $size = 0;
+
+        if ($field->isMap()) {
+            $getter = $field->getGetter();
+            $values = $this->$getter();
+            $count = count($values);
+            if ($count !== 0) {
+                if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                    $size += 3;                              // size for "\"\":".
+                    $size += strlen($field->getJsonName());  // size for field name
+                }
+                $size += 2;  // size for "{}".
+                $size += $count - 1;                     // size for commas
+                $getter = $field->getGetter();
+                $map_entry = $field->getMessageType();
+                $key_field = $map_entry->getFieldByNumber(1);
+                $value_field = $map_entry->getFieldByNumber(2);
+                switch ($key_field->getType()) {
+                case GPBType::STRING:
+                case GPBType::SFIXED64:
+                case GPBType::INT64:
+                case GPBType::SINT64:
+                case GPBType::FIXED64:
+                case GPBType::UINT64:
+                    $additional_quote = false;
+                    break;
+                default:
+                    $additional_quote = true;
+                }
+                foreach ($values as $key => $value) {
+                    if ($additional_quote) {
+                        $size += 2;  // size for ""
+                    }
+                    $size += $this->fieldDataOnlyJsonByteSize($key_field, $key);
+                    $size += $this->fieldDataOnlyJsonByteSize($value_field, $value);
+                    $size += 1;  // size for :
+                }
+            }
+        } elseif ($field->isRepeated()) {
+            $getter = $field->getGetter();
+            $values = $this->$getter();
+            $count = count($values);
+            if ($count !== 0) {
+                if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                    $size += 3;                              // size for "\"\":".
+                    $size += strlen($field->getJsonName());  // size for field name
+                }
+                $size += 2;  // size for "[]".
+                $size += $count - 1;                     // size for commas
+                $getter = $field->getGetter();
+                foreach ($values as $value) {
+                    $size += $this->fieldDataOnlyJsonByteSize($field, $value);
+                }
+            }
+        } elseif ($this->existField($field) || GPBUtil::hasJsonValue($this)) {
+            if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                $size += 3;                              // size for "\"\":".
+                $size += strlen($field->getJsonName());  // size for field name
+            }
+            $getter = $field->getGetter();
+            $value = $this->$getter();
+            $size += $this->fieldDataOnlyJsonByteSize($field, $value);
+        }
+        return $size;
+    }
+
+    /**
+     * @ignore
+     */
     public function byteSize()
     {
         $size = 0;
@@ -874,6 +1734,89 @@ class Message
         foreach ($fields as $field) {
             $size += $this->fieldByteSize($field);
         }
+        $size += strlen($this->unknown);
+        return $size;
+    }
+
+    private function appendHelper($field, $append_value)
+    {
+        $getter = $field->getGetter();
+        $setter = $field->getSetter();
+
+        $field_arr_value = $this->$getter();
+        $field_arr_value[] = $append_value;
+
+        if (!is_object($field_arr_value)) {
+            $this->$setter($field_arr_value);
+        }
+    }
+
+    private function kvUpdateHelper($field, $update_key, $update_value)
+    {
+        $getter = $field->getGetter();
+        $setter = $field->getSetter();
+
+        $field_arr_value = $this->$getter();
+        $field_arr_value[$update_key] = $update_value;
+
+        if (!is_object($field_arr_value)) {
+            $this->$setter($field_arr_value);
+        }
+    }
+
+    /**
+     * @ignore
+     */
+    public function jsonByteSize()
+    {
+        $size = 0;
+        if (is_a($this, 'Google\Protobuf\Any')) {
+            // Size for "{}".
+            $size += 2;
+
+            // Size for "\"@type\":".
+            $size += 8;
+
+            // Size for url. +2 for "" /.
+            $size += strlen($this->getTypeUrl()) + 2;
+
+            $value_msg = $this->unpack();
+            if (GPBUtil::hasSpecialJsonMapping($value_msg)) {
+                // Size for "\",value\":".
+                $size += 9;
+                $size += $value_msg->jsonByteSize();
+            } else {
+                // Size for value. +1 for comma, -2 for "{}".
+                $size += $value_msg->jsonByteSize() -1;
+            }
+        } elseif (get_class($this) === 'Google\Protobuf\FieldMask') {
+            $field_mask = GPBUtil::formatFieldMask($this);
+            $size += strlen($field_mask) + 2;  // 2 for ""
+        } elseif (get_class($this) === 'Google\Protobuf\Duration') {
+            $duration = GPBUtil::formatDuration($this) . "s";
+            $size += strlen($duration) + 2;  // 2 for ""
+        } elseif (get_class($this) === 'Google\Protobuf\Timestamp') {
+            $timestamp = GPBUtil::formatTimestamp($this);
+            $timestamp = json_encode($timestamp);
+            $size += strlen($timestamp);
+        } else {
+            if (!GPBUtil::hasSpecialJsonMapping($this)) {
+                // Size for "{}".
+                $size += 2;
+            }
+
+            $fields = $this->desc->getField();
+            $count = 0;
+            foreach ($fields as $field) {
+                $field_size = $this->fieldJsonByteSize($field);
+                $size += $field_size;
+                if ($field_size != 0) {
+                  $count++;
+                }
+            }
+            // size for comma
+            $size += $count > 0 ? ($count - 1) : 0;
+        }
         return $size;
     }
 }
diff --git a/php/src/Google/Protobuf/Internal/MessageOptions.php b/php/src/Google/Protobuf/Internal/MessageOptions.php
index e4a214cb..bf490de6 100644
--- a/php/src/Google/Protobuf/Internal/MessageOptions.php
+++ b/php/src/Google/Protobuf/Internal/MessageOptions.php
@@ -8,16 +8,14 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.MessageOptions</code>
+ * Generated from protobuf message <code>google.protobuf.MessageOptions</code>
  */
 class MessageOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Set true to use the old proto1 MessageSet wire format for extensions.
      * This is provided for backwards-compatibility with the MessageSet wire
      * format.  You should not use this for any other reason:  It's less
@@ -33,41 +31,35 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * be int32s, enums, or repeated messages.
      * Because this is an option, the above two restrictions are not enforced by
      * the protocol compiler.
-     * </pre>
      *
-     * <code>optional bool message_set_wire_format = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool message_set_wire_format = 1 [default = false];</code>
      */
     private $message_set_wire_format = false;
     private $has_message_set_wire_format = false;
     /**
-     * <pre>
      * Disables the generation of the standard "descriptor()" accessor, which can
      * conflict with a field of the same name.  This is meant to make migration
      * from proto1 easier; new code should avoid fields named "descriptor".
-     * </pre>
      *
-     * <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
+     * Generated from protobuf field <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
      */
     private $no_standard_descriptor_accessor = false;
     private $has_no_standard_descriptor_accessor = false;
     /**
-     * <pre>
      * Is this message deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the message, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating messages.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * Whether the message is an automatically generated map entry type for the
      * maps field.
      * For maps fields:
-     *     map&lt;KeyType, ValueType&gt; map_field = 1;
+     *     map<KeyType, ValueType> map_field = 1;
      * The parsed descriptor looks like:
      *     message MapFieldEntry {
      *         option map_entry = true;
@@ -82,29 +74,79 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * NOTE: Do not set the option in .proto files. Always use the maps syntax
      * instead. The option should only be implicitly set by the proto compiler
      * parser.
-     * </pre>
      *
-     * <code>optional bool map_entry = 7;</code>
+     * Generated from protobuf field <code>optional bool map_entry = 7;</code>
      */
     private $map_entry = false;
     private $has_map_entry = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $message_set_wire_format
+     *           Set true to use the old proto1 MessageSet wire format for extensions.
+     *           This is provided for backwards-compatibility with the MessageSet wire
+     *           format.  You should not use this for any other reason:  It's less
+     *           efficient, has fewer features, and is more complicated.
+     *           The message must be defined exactly as follows:
+     *             message Foo {
+     *               option message_set_wire_format = true;
+     *               extensions 4 to max;
+     *             }
+     *           Note that the message cannot have any defined fields; MessageSets only
+     *           have extensions.
+     *           All extensions of your type must be singular messages; e.g. they cannot
+     *           be int32s, enums, or repeated messages.
+     *           Because this is an option, the above two restrictions are not enforced by
+     *           the protocol compiler.
+     *     @type bool $no_standard_descriptor_accessor
+     *           Disables the generation of the standard "descriptor()" accessor, which can
+     *           conflict with a field of the same name.  This is meant to make migration
+     *           from proto1 easier; new code should avoid fields named "descriptor".
+     *     @type bool $deprecated
+     *           Is this message deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for the message, or it will be completely ignored; in the very least,
+     *           this is a formalization for deprecating messages.
+     *     @type bool $map_entry
+     *           Whether the message is an automatically generated map entry type for the
+     *           maps field.
+     *           For maps fields:
+     *               map<KeyType, ValueType> map_field = 1;
+     *           The parsed descriptor looks like:
+     *               message MapFieldEntry {
+     *                   option map_entry = true;
+     *                   optional KeyType key = 1;
+     *                   optional ValueType value = 2;
+     *               }
+     *               repeated MapFieldEntry map_field = 1;
+     *           Implementations may choose not to generate the map_entry=true message, but
+     *           use a native map in the target language to hold the keys and values.
+     *           The reflection APIs in such implementions still need to work as
+     *           if the field is a repeated message field.
+     *           NOTE: Do not set the option in .proto files. Always use the maps syntax
+     *           instead. The option should only be implicitly set by the proto compiler
+     *           parser.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Set true to use the old proto1 MessageSet wire format for extensions.
      * This is provided for backwards-compatibility with the MessageSet wire
      * format.  You should not use this for any other reason:  It's less
@@ -120,9 +162,9 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * be int32s, enums, or repeated messages.
      * Because this is an option, the above two restrictions are not enforced by
      * the protocol compiler.
-     * </pre>
      *
-     * <code>optional bool message_set_wire_format = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool message_set_wire_format = 1 [default = false];</code>
+     * @return bool
      */
     public function getMessageSetWireFormat()
     {
@@ -130,7 +172,6 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Set true to use the old proto1 MessageSet wire format for extensions.
      * This is provided for backwards-compatibility with the MessageSet wire
      * format.  You should not use this for any other reason:  It's less
@@ -146,15 +187,18 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * be int32s, enums, or repeated messages.
      * Because this is an option, the above two restrictions are not enforced by
      * the protocol compiler.
-     * </pre>
      *
-     * <code>optional bool message_set_wire_format = 1 [default = false];</code>
+     * Generated from protobuf field <code>optional bool message_set_wire_format = 1 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setMessageSetWireFormat($var)
     {
         GPBUtil::checkBool($var);
         $this->message_set_wire_format = $var;
         $this->has_message_set_wire_format = true;
+
+        return $this;
     }
 
     public function hasMessageSetWireFormat()
@@ -163,13 +207,12 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Disables the generation of the standard "descriptor()" accessor, which can
      * conflict with a field of the same name.  This is meant to make migration
      * from proto1 easier; new code should avoid fields named "descriptor".
-     * </pre>
      *
-     * <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
+     * Generated from protobuf field <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
+     * @return bool
      */
     public function getNoStandardDescriptorAccessor()
     {
@@ -177,19 +220,21 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Disables the generation of the standard "descriptor()" accessor, which can
      * conflict with a field of the same name.  This is meant to make migration
      * from proto1 easier; new code should avoid fields named "descriptor".
-     * </pre>
      *
-     * <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
+     * Generated from protobuf field <code>optional bool no_standard_descriptor_accessor = 2 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setNoStandardDescriptorAccessor($var)
     {
         GPBUtil::checkBool($var);
         $this->no_standard_descriptor_accessor = $var;
         $this->has_no_standard_descriptor_accessor = true;
+
+        return $this;
     }
 
     public function hasNoStandardDescriptorAccessor()
@@ -198,14 +243,13 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this message deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the message, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating messages.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -213,20 +257,22 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this message deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the message, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating messages.
-     * </pre>
      *
-     * <code>optional bool deprecated = 3 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 3 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -235,11 +281,10 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Whether the message is an automatically generated map entry type for the
      * maps field.
      * For maps fields:
-     *     map&lt;KeyType, ValueType&gt; map_field = 1;
+     *     map<KeyType, ValueType> map_field = 1;
      * The parsed descriptor looks like:
      *     message MapFieldEntry {
      *         option map_entry = true;
@@ -254,9 +299,9 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * NOTE: Do not set the option in .proto files. Always use the maps syntax
      * instead. The option should only be implicitly set by the proto compiler
      * parser.
-     * </pre>
      *
-     * <code>optional bool map_entry = 7;</code>
+     * Generated from protobuf field <code>optional bool map_entry = 7;</code>
+     * @return bool
      */
     public function getMapEntry()
     {
@@ -264,11 +309,10 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Whether the message is an automatically generated map entry type for the
      * maps field.
      * For maps fields:
-     *     map&lt;KeyType, ValueType&gt; map_field = 1;
+     *     map<KeyType, ValueType> map_field = 1;
      * The parsed descriptor looks like:
      *     message MapFieldEntry {
      *         option map_entry = true;
@@ -283,15 +327,18 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
      * NOTE: Do not set the option in .proto files. Always use the maps syntax
      * instead. The option should only be implicitly set by the proto compiler
      * parser.
-     * </pre>
      *
-     * <code>optional bool map_entry = 7;</code>
+     * Generated from protobuf field <code>optional bool map_entry = 7;</code>
+     * @param bool $var
+     * @return $this
      */
     public function setMapEntry($var)
     {
         GPBUtil::checkBool($var);
         $this->map_entry = $var;
         $this->has_map_entry = true;
+
+        return $this;
     }
 
     public function hasMapEntry()
@@ -300,11 +347,10 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -312,17 +358,19 @@ class MessageOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/MethodDescriptorProto.php b/php/src/Google/Protobuf/Internal/MethodDescriptorProto.php
index 3d8df7af..1bd5dd3e 100644
--- a/php/src/Google/Protobuf/Internal/MethodDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/MethodDescriptorProto.php
@@ -8,69 +8,79 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a method of a service.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.MethodDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.MethodDescriptorProto</code>
  */
 class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <pre>
      * Input and output type names.  These are resolved in the same way as
      * FieldDescriptorProto.type_name, but must refer to a message type.
-     * </pre>
      *
-     * <code>optional string input_type = 2;</code>
+     * Generated from protobuf field <code>optional string input_type = 2;</code>
      */
     private $input_type = '';
     private $has_input_type = false;
     /**
-     * <code>optional string output_type = 3;</code>
+     * Generated from protobuf field <code>optional string output_type = 3;</code>
      */
     private $output_type = '';
     private $has_output_type = false;
     /**
-     * <code>optional .google.protobuf.MethodOptions options = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions options = 4;</code>
      */
     private $options = null;
     private $has_options = false;
     /**
-     * <pre>
      * Identifies if client streams multiple client messages
-     * </pre>
      *
-     * <code>optional bool client_streaming = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool client_streaming = 5 [default = false];</code>
      */
     private $client_streaming = false;
     private $has_client_streaming = false;
     /**
-     * <pre>
      * Identifies if server streams multiple server messages
-     * </pre>
      *
-     * <code>optional bool server_streaming = 6 [default = false];</code>
+     * Generated from protobuf field <code>optional bool server_streaming = 6 [default = false];</code>
      */
     private $server_streaming = false;
     private $has_server_streaming = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type string $input_type
+     *           Input and output type names.  These are resolved in the same way as
+     *           FieldDescriptorProto.type_name, but must refer to a message type.
+     *     @type string $output_type
+     *     @type \Google\Protobuf\Internal\MethodOptions $options
+     *     @type bool $client_streaming
+     *           Identifies if client streams multiple client messages
+     *     @type bool $server_streaming
+     *           Identifies if server streams multiple server messages
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -78,13 +88,17 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -93,12 +107,11 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Input and output type names.  These are resolved in the same way as
      * FieldDescriptorProto.type_name, but must refer to a message type.
-     * </pre>
      *
-     * <code>optional string input_type = 2;</code>
+     * Generated from protobuf field <code>optional string input_type = 2;</code>
+     * @return string
      */
     public function getInputType()
     {
@@ -106,18 +119,20 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Input and output type names.  These are resolved in the same way as
      * FieldDescriptorProto.type_name, but must refer to a message type.
-     * </pre>
      *
-     * <code>optional string input_type = 2;</code>
+     * Generated from protobuf field <code>optional string input_type = 2;</code>
+     * @param string $var
+     * @return $this
      */
     public function setInputType($var)
     {
         GPBUtil::checkString($var, True);
         $this->input_type = $var;
         $this->has_input_type = true;
+
+        return $this;
     }
 
     public function hasInputType()
@@ -126,7 +141,8 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string output_type = 3;</code>
+     * Generated from protobuf field <code>optional string output_type = 3;</code>
+     * @return string
      */
     public function getOutputType()
     {
@@ -134,13 +150,17 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string output_type = 3;</code>
+     * Generated from protobuf field <code>optional string output_type = 3;</code>
+     * @param string $var
+     * @return $this
      */
     public function setOutputType($var)
     {
         GPBUtil::checkString($var, True);
         $this->output_type = $var;
         $this->has_output_type = true;
+
+        return $this;
     }
 
     public function hasOutputType()
@@ -149,7 +169,8 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MethodOptions options = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions options = 4;</code>
+     * @return \Google\Protobuf\Internal\MethodOptions
      */
     public function getOptions()
     {
@@ -157,13 +178,17 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MethodOptions options = 4;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions options = 4;</code>
+     * @param \Google\Protobuf\Internal\MethodOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\MethodOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
@@ -172,11 +197,10 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies if client streams multiple client messages
-     * </pre>
      *
-     * <code>optional bool client_streaming = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool client_streaming = 5 [default = false];</code>
+     * @return bool
      */
     public function getClientStreaming()
     {
@@ -184,17 +208,19 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies if client streams multiple client messages
-     * </pre>
      *
-     * <code>optional bool client_streaming = 5 [default = false];</code>
+     * Generated from protobuf field <code>optional bool client_streaming = 5 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setClientStreaming($var)
     {
         GPBUtil::checkBool($var);
         $this->client_streaming = $var;
         $this->has_client_streaming = true;
+
+        return $this;
     }
 
     public function hasClientStreaming()
@@ -203,11 +229,10 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies if server streams multiple server messages
-     * </pre>
      *
-     * <code>optional bool server_streaming = 6 [default = false];</code>
+     * Generated from protobuf field <code>optional bool server_streaming = 6 [default = false];</code>
+     * @return bool
      */
     public function getServerStreaming()
     {
@@ -215,17 +240,19 @@ class MethodDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies if server streams multiple server messages
-     * </pre>
      *
-     * <code>optional bool server_streaming = 6 [default = false];</code>
+     * Generated from protobuf field <code>optional bool server_streaming = 6 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setServerStreaming($var)
     {
         GPBUtil::checkBool($var);
         $this->server_streaming = $var;
         $this->has_server_streaming = true;
+
+        return $this;
     }
 
     public function hasServerStreaming()
diff --git a/php/src/Google/Protobuf/Internal/MethodOptions.php b/php/src/Google/Protobuf/Internal/MethodOptions.php
index 3325e52b..a2c729a9 100644
--- a/php/src/Google/Protobuf/Internal/MethodOptions.php
+++ b/php/src/Google/Protobuf/Internal/MethodOptions.php
@@ -8,55 +8,65 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.MethodOptions</code>
+ * Generated from protobuf message <code>google.protobuf.MethodOptions</code>
  */
 class MethodOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Is this method deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the method, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating methods.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
      */
     private $idempotency_level = 0;
     private $has_idempotency_level = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $deprecated
+     *           Is this method deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for the method, or it will be completely ignored; in the very least,
+     *           this is a formalization for deprecating methods.
+     *     @type int $idempotency_level
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Is this method deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the method, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating methods.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -64,20 +74,22 @@ class MethodOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this method deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the method, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating methods.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -86,7 +98,8 @@ class MethodOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
+     * @return int
      */
     public function getIdempotencyLevel()
     {
@@ -94,13 +107,17 @@ class MethodOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
+     * Generated from protobuf field <code>optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];</code>
+     * @param int $var
+     * @return $this
      */
     public function setIdempotencyLevel($var)
     {
         GPBUtil::checkEnum($var, \Google\Protobuf\Internal\MethodOptions_IdempotencyLevel::class);
         $this->idempotency_level = $var;
         $this->has_idempotency_level = true;
+
+        return $this;
     }
 
     public function hasIdempotencyLevel()
@@ -109,11 +126,10 @@ class MethodOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -121,17 +137,19 @@ class MethodOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php b/php/src/Google/Protobuf/Internal/MethodOptions/IdempotencyLevel.php
index 62768b5c..dcc30e27 100644
--- a/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php
+++ b/php/src/Google/Protobuf/Internal/MethodOptions/IdempotencyLevel.php
@@ -2,38 +2,35 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/protobuf/descriptor.proto
 
+namespace Google\Protobuf\Internal\MethodOptions;
+
 /**
- * <pre>
  * Is this method side-effect-free (or safe in HTTP parlance), or idempotent,
  * or neither? HTTP based RPC implementation may choose GET verb for safe
  * methods, and PUT verb for idempotent methods instead of the default POST.
- * </pre>
  *
- * Protobuf enum <code>google.protobuf.MethodOptions.IdempotencyLevel</code>
+ * Protobuf type <code>google.protobuf.MethodOptions.IdempotencyLevel</code>
  */
-namespace Google\Protobuf\Internal;
-
-class MethodOptions_IdempotencyLevel
+class IdempotencyLevel
 {
     /**
-     * <code>IDEMPOTENCY_UNKNOWN = 0;</code>
+     * Generated from protobuf enum <code>IDEMPOTENCY_UNKNOWN = 0;</code>
      */
     const IDEMPOTENCY_UNKNOWN = 0;
     /**
-     * <pre>
      * implies idempotent
-     * </pre>
      *
-     * <code>NO_SIDE_EFFECTS = 1;</code>
+     * Generated from protobuf enum <code>NO_SIDE_EFFECTS = 1;</code>
      */
     const NO_SIDE_EFFECTS = 1;
     /**
-     * <pre>
      * idempotent, but may have side effects
-     * </pre>
      *
-     * <code>IDEMPOTENT = 2;</code>
+     * Generated from protobuf enum <code>IDEMPOTENT = 2;</code>
      */
     const IDEMPOTENT = 2;
 }
 
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(IdempotencyLevel::class, \Google\Protobuf\Internal\MethodOptions_IdempotencyLevel::class);
+
diff --git a/php/src/Google/Protobuf/Internal/OneofDescriptor.php b/php/src/Google/Protobuf/Internal/OneofDescriptor.php
new file mode 100644
index 00000000..67b107f6
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/OneofDescriptor.php
@@ -0,0 +1,78 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class OneofDescriptor
+{
+    use HasPublicDescriptorTrait;
+
+    private $name;
+    private $fields;
+
+    public function __construct()
+    {
+        $this->public_desc = new \Google\Protobuf\OneofDescriptor($this);
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function addField(FieldDescriptor $field)
+    {
+        $this->fields[] = $field;
+    }
+
+    public function getFields()
+    {
+        return $this->fields;
+    }
+
+    public static function buildFromProto($oneof_proto, $desc, $index)
+    {
+        $oneof = new OneofDescriptor();
+        $oneof->setName($oneof_proto->getName());
+        foreach ($desc->getField() as $field) {
+            if ($field->getOneofIndex() == $index) {
+                $oneof->addField($field);
+            }
+        }
+        return $oneof;
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/OneofDescriptorProto.php b/php/src/Google/Protobuf/Internal/OneofDescriptorProto.php
index e5fbe370..9ecfe5cb 100644
--- a/php/src/Google/Protobuf/Internal/OneofDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/OneofDescriptorProto.php
@@ -8,36 +8,44 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a oneof.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.OneofDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.OneofDescriptorProto</code>
  */
 class OneofDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>optional .google.protobuf.OneofOptions options = 2;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.OneofOptions options = 2;</code>
      */
     private $options = null;
     private $has_options = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type \Google\Protobuf\Internal\OneofOptions $options
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -45,13 +53,17 @@ class OneofDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -60,7 +72,8 @@ class OneofDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.OneofOptions options = 2;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.OneofOptions options = 2;</code>
+     * @return \Google\Protobuf\Internal\OneofOptions
      */
     public function getOptions()
     {
@@ -68,13 +81,17 @@ class OneofDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.OneofOptions options = 2;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.OneofOptions options = 2;</code>
+     * @param \Google\Protobuf\Internal\OneofOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\OneofOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
diff --git a/php/src/Google/Protobuf/Internal/OneofOptions.php b/php/src/Google/Protobuf/Internal/OneofOptions.php
index 083d9929..46b516f3 100644
--- a/php/src/Google/Protobuf/Internal/OneofOptions.php
+++ b/php/src/Google/Protobuf/Internal/OneofOptions.php
@@ -8,35 +8,41 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.OneofOptions</code>
+ * Generated from protobuf message <code>google.protobuf.OneofOptions</code>
  */
 class OneofOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -44,17 +50,19 @@ class OneofOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/RawInputStream.php b/php/src/Google/Protobuf/Internal/RawInputStream.php
new file mode 100644
index 00000000..4e7ed5cb
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/RawInputStream.php
@@ -0,0 +1,50 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf\Internal;
+
+class RawInputStream
+{
+
+    private $buffer;
+
+    public function __construct($buffer)
+    {
+        $this->buffer = $buffer;
+    }
+
+    public function getData()
+    {
+        return $this->buffer;
+    }
+
+}
diff --git a/php/src/Google/Protobuf/Internal/RepeatedField.php b/php/src/Google/Protobuf/Internal/RepeatedField.php
index 0dc5d9d2..797b3b3a 100644
--- a/php/src/Google/Protobuf/Internal/RepeatedField.php
+++ b/php/src/Google/Protobuf/Internal/RepeatedField.php
@@ -41,86 +41,6 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * RepeatedFieldIter is used to iterate RepeatedField. It is also need for the
- * foreach syntax.
- */
-class RepeatedFieldIter implements \Iterator
-{
-
-    /**
-     * @ignore
-     */
-    private $position;
-    /**
-     * @ignore
-     */
-    private $container;
-
-    /**
-     * Create iterator instance for RepeatedField.
-     *
-     * @param RepeatedField The RepeatedField instance for which this iterator
-     * is created.
-     * @ignore
-     */
-    public function __construct($container)
-    {
-        $this->position = 0;
-        $this->container = $container;
-    }
-
-    /**
-     * Reset the status of the iterator
-     *
-     * @return void
-     */
-    public function rewind()
-    {
-        $this->position = 0;
-    }
-
-    /**
-     * Return the element at the current position.
-     *
-     * @return object The element at the current position.
-     */
-    public function current()
-    {
-        return $this->container[$this->position];
-    }
-
-    /**
-     * Return the current position.
-     *
-     * @return integer The current position.
-     */
-    public function key()
-    {
-        return $this->position;
-    }
-
-    /**
-     * Move to the next position.
-     *
-     * @return void
-     */
-    public function next()
-    {
-        ++$this->position;
-    }
-
-    /**
-     * Check whether there are more elements to iterate.
-     *
-     * @return bool True if there are more elements to iterate.
-     */
-    public function valid()
-    {
-        return isset($this->container[$this->position]);
-    }
-}
-
-/**
  * RepeatedField is used by generated protocol message classes to manipulate
  * repeated fields. It can be used like native PHP array.
  */
@@ -225,6 +145,10 @@ class RepeatedField implements \ArrayAccess, \IteratorAggregate, \Countable
                 GPBUtil::checkString($value, true);
                 break;
             case GPBType::MESSAGE:
+                if (is_null($value)) {
+                  trigger_error("RepeatedField element cannot be null.",
+                                E_USER_ERROR);
+                }
                 GPBUtil::checkMessage($value, $this->klass);
                 break;
             default:
diff --git a/php/src/Google/Protobuf/Internal/RepeatedFieldIter.php b/php/src/Google/Protobuf/Internal/RepeatedFieldIter.php
new file mode 100644
index 00000000..2b6f8230
--- /dev/null
+++ b/php/src/Google/Protobuf/Internal/RepeatedFieldIter.php
@@ -0,0 +1,118 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * RepeatedField and RepeatedFieldIter are used by generated protocol message
+ * classes to manipulate repeated fields.
+ */
+
+namespace Google\Protobuf\Internal;
+
+/**
+ * RepeatedFieldIter is used to iterate RepeatedField. It is also need for the
+ * foreach syntax.
+ */
+class RepeatedFieldIter implements \Iterator
+{
+
+    /**
+     * @ignore
+     */
+    private $position;
+    /**
+     * @ignore
+     */
+    private $container;
+
+    /**
+     * Create iterator instance for RepeatedField.
+     *
+     * @param RepeatedField The RepeatedField instance for which this iterator
+     * is created.
+     * @ignore
+     */
+    public function __construct($container)
+    {
+        $this->position = 0;
+        $this->container = $container;
+    }
+
+    /**
+     * Reset the status of the iterator
+     *
+     * @return void
+     */
+    public function rewind()
+    {
+        $this->position = 0;
+    }
+
+    /**
+     * Return the element at the current position.
+     *
+     * @return object The element at the current position.
+     */
+    public function current()
+    {
+        return $this->container[$this->position];
+    }
+
+    /**
+     * Return the current position.
+     *
+     * @return integer The current position.
+     */
+    public function key()
+    {
+        return $this->position;
+    }
+
+    /**
+     * Move to the next position.
+     *
+     * @return void
+     */
+    public function next()
+    {
+        ++$this->position;
+    }
+
+    /**
+     * Check whether there are more elements to iterate.
+     *
+     * @return bool True if there are more elements to iterate.
+     */
+    public function valid()
+    {
+        return isset($this->container[$this->position]);
+    }
+}
diff --git a/php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php b/php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php
index 624bde84..8de7afd0 100644
--- a/php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php
+++ b/php/src/Google/Protobuf/Internal/ServiceDescriptorProto.php
@@ -8,41 +8,50 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Describes a service.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.ServiceDescriptorProto</code>
+ * Generated from protobuf message <code>google.protobuf.ServiceDescriptorProto</code>
  */
 class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
      */
     private $name = '';
     private $has_name = false;
     /**
-     * <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
      */
     private $method;
     private $has_method = false;
     /**
-     * <code>optional .google.protobuf.ServiceOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.ServiceOptions options = 3;</code>
      */
     private $options = null;
     private $has_options = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *     @type \Google\Protobuf\Internal\MethodDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $method
+     *     @type \Google\Protobuf\Internal\ServiceOptions $options
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @return string
      */
     public function getName()
     {
@@ -50,13 +59,17 @@ class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string name = 1;</code>
+     * Generated from protobuf field <code>optional string name = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setName($var)
     {
         GPBUtil::checkString($var, True);
         $this->name = $var;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -65,7 +78,8 @@ class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getMethod()
     {
@@ -73,13 +87,17 @@ class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.MethodDescriptorProto method = 2;</code>
+     * @param \Google\Protobuf\Internal\MethodDescriptorProto[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setMethod(&$var)
+    public function setMethod($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\MethodDescriptorProto::class);
-        $this->method = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\MethodDescriptorProto::class);
+        $this->method = $arr;
         $this->has_method = true;
+
+        return $this;
     }
 
     public function hasMethod()
@@ -88,7 +106,8 @@ class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.ServiceOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.ServiceOptions options = 3;</code>
+     * @return \Google\Protobuf\Internal\ServiceOptions
      */
     public function getOptions()
     {
@@ -96,13 +115,17 @@ class ServiceDescriptorProto extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional .google.protobuf.ServiceOptions options = 3;</code>
+     * Generated from protobuf field <code>optional .google.protobuf.ServiceOptions options = 3;</code>
+     * @param \Google\Protobuf\Internal\ServiceOptions $var
+     * @return $this
      */
-    public function setOptions(&$var)
+    public function setOptions($var)
     {
         GPBUtil::checkMessage($var, \Google\Protobuf\Internal\ServiceOptions::class);
         $this->options = $var;
         $this->has_options = true;
+
+        return $this;
     }
 
     public function hasOptions()
diff --git a/php/src/Google/Protobuf/Internal/ServiceOptions.php b/php/src/Google/Protobuf/Internal/ServiceOptions.php
index 5f3564e4..67162f37 100644
--- a/php/src/Google/Protobuf/Internal/ServiceOptions.php
+++ b/php/src/Google/Protobuf/Internal/ServiceOptions.php
@@ -8,50 +8,59 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.ServiceOptions</code>
+ * Generated from protobuf message <code>google.protobuf.ServiceOptions</code>
  */
 class ServiceOptions extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Is this service deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the service, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating services.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
      */
     private $deprecated = false;
     private $has_deprecated = false;
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
      */
     private $uninterpreted_option;
     private $has_uninterpreted_option = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type bool $deprecated
+     *           Is this service deprecated?
+     *           Depending on the target platform, this can emit Deprecated annotations
+     *           for the service, or it will be completely ignored; in the very least,
+     *           this is a formalization for deprecating services.
+     *     @type \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $uninterpreted_option
+     *           The parser stores options it doesn't recognize here. See above.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Is this service deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the service, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating services.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
+     * @return bool
      */
     public function getDeprecated()
     {
@@ -59,20 +68,22 @@ class ServiceOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Is this service deprecated?
      * Depending on the target platform, this can emit Deprecated annotations
      * for the service, or it will be completely ignored; in the very least,
      * this is a formalization for deprecating services.
-     * </pre>
      *
-     * <code>optional bool deprecated = 33 [default = false];</code>
+     * Generated from protobuf field <code>optional bool deprecated = 33 [default = false];</code>
+     * @param bool $var
+     * @return $this
      */
     public function setDeprecated($var)
     {
         GPBUtil::checkBool($var);
         $this->deprecated = $var;
         $this->has_deprecated = true;
+
+        return $this;
     }
 
     public function hasDeprecated()
@@ -81,11 +92,10 @@ class ServiceOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getUninterpretedOption()
     {
@@ -93,17 +103,19 @@ class ServiceOptions extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The parser stores options it doesn't recognize here. See above.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setUninterpretedOption(&$var)
+    public function setUninterpretedOption($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
-        $this->uninterpreted_option = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption::class);
+        $this->uninterpreted_option = $arr;
         $this->has_uninterpreted_option = true;
+
+        return $this;
     }
 
     public function hasUninterpretedOption()
diff --git a/php/src/Google/Protobuf/Internal/SourceCodeInfo.php b/php/src/Google/Protobuf/Internal/SourceCodeInfo.php
index d2352ddd..6e413f77 100644
--- a/php/src/Google/Protobuf/Internal/SourceCodeInfo.php
+++ b/php/src/Google/Protobuf/Internal/SourceCodeInfo.php
@@ -8,21 +8,17 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * Encapsulates information about the original source file from which a
  * FileDescriptorProto was generated.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.SourceCodeInfo</code>
+ * Generated from protobuf message <code>google.protobuf.SourceCodeInfo</code>
  */
 class SourceCodeInfo extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * A Location identifies a piece of source code in a .proto file which
      * corresponds to a particular definition.  This information is intended
      * to be useful to IDEs, code indexers, documentation generators, and similar
@@ -64,20 +60,68 @@ class SourceCodeInfo extends \Google\Protobuf\Internal\Message
      * - Code which tries to interpret locations should probably be designed to
      *   ignore those that it doesn't understand, as more types of locations could
      *   be recorded in the future.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
      */
     private $location;
     private $has_location = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\SourceCodeInfo\Location[]|\Google\Protobuf\Internal\RepeatedField $location
+     *           A Location identifies a piece of source code in a .proto file which
+     *           corresponds to a particular definition.  This information is intended
+     *           to be useful to IDEs, code indexers, documentation generators, and similar
+     *           tools.
+     *           For example, say we have a file like:
+     *             message Foo {
+     *               optional string foo = 1;
+     *             }
+     *           Let's look at just the field definition:
+     *             optional string foo = 1;
+     *             ^       ^^     ^^  ^  ^^^
+     *             a       bc     de  f  ghi
+     *           We have the following locations:
+     *             span   path               represents
+     *             [a,i)  [ 4, 0, 2, 0 ]     The whole field definition.
+     *             [a,b)  [ 4, 0, 2, 0, 4 ]  The label (optional).
+     *             [c,d)  [ 4, 0, 2, 0, 5 ]  The type (string).
+     *             [e,f)  [ 4, 0, 2, 0, 1 ]  The name (foo).
+     *             [g,h)  [ 4, 0, 2, 0, 3 ]  The number (1).
+     *           Notes:
+     *           - A location may refer to a repeated field itself (i.e. not to any
+     *             particular index within it).  This is used whenever a set of elements are
+     *             logically enclosed in a single code segment.  For example, an entire
+     *             extend block (possibly containing multiple extension definitions) will
+     *             have an outer location whose path refers to the "extensions" repeated
+     *             field without an index.
+     *           - Multiple locations may have the same path.  This happens when a single
+     *             logical declaration is spread out across multiple places.  The most
+     *             obvious example is the "extend" block again -- there may be multiple
+     *             extend blocks in the same scope, each of which will have the same path.
+     *           - A location's span is not always a subset of its parent's span.  For
+     *             example, the "extendee" of an extension declaration appears at the
+     *             beginning of the "extend" block and is shared by all extensions within
+     *             the block.
+     *           - Just because a location's span is a subset of some other location's span
+     *             does not mean that it is a descendent.  For example, a "group" defines
+     *             both a type and a field in a single declaration.  Thus, the locations
+     *             corresponding to the type and field and their components will overlap.
+     *           - Code which tries to interpret locations should probably be designed to
+     *             ignore those that it doesn't understand, as more types of locations could
+     *             be recorded in the future.
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * A Location identifies a piece of source code in a .proto file which
      * corresponds to a particular definition.  This information is intended
      * to be useful to IDEs, code indexers, documentation generators, and similar
@@ -119,9 +163,9 @@ class SourceCodeInfo extends \Google\Protobuf\Internal\Message
      * - Code which tries to interpret locations should probably be designed to
      *   ignore those that it doesn't understand, as more types of locations could
      *   be recorded in the future.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getLocation()
     {
@@ -129,7 +173,6 @@ class SourceCodeInfo extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * A Location identifies a piece of source code in a .proto file which
      * corresponds to a particular definition.  This information is intended
      * to be useful to IDEs, code indexers, documentation generators, and similar
@@ -171,15 +214,18 @@ class SourceCodeInfo extends \Google\Protobuf\Internal\Message
      * - Code which tries to interpret locations should probably be designed to
      *   ignore those that it doesn't understand, as more types of locations could
      *   be recorded in the future.
-     * </pre>
      *
-     * <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.SourceCodeInfo.Location location = 1;</code>
+     * @param \Google\Protobuf\Internal\SourceCodeInfo\Location[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setLocation(&$var)
+    public function setLocation($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\SourceCodeInfo_Location::class);
-        $this->location = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\SourceCodeInfo\Location::class);
+        $this->location = $arr;
         $this->has_location = true;
+
+        return $this;
     }
 
     public function hasLocation()
diff --git a/php/src/Google/Protobuf/Internal/SourceCodeInfo_Location.php b/php/src/Google/Protobuf/Internal/SourceCodeInfo/Location.php
index d1bdb166..bad247a1 100644
--- a/php/src/Google/Protobuf/Internal/SourceCodeInfo_Location.php
+++ b/php/src/Google/Protobuf/Internal/SourceCodeInfo/Location.php
@@ -2,22 +2,20 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/protobuf/descriptor.proto
 
-namespace Google\Protobuf\Internal;
+namespace Google\Protobuf\Internal\SourceCodeInfo;
 
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * Protobuf type <code>google.protobuf.SourceCodeInfo.Location</code>
+ * Generated from protobuf message <code>google.protobuf.SourceCodeInfo.Location</code>
  */
-class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
+class Location extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <pre>
      * Identifies which part of the FileDescriptorProto was defined at this
      * location.
      * Each element is a field number or an index.  They form a path from
@@ -39,27 +37,23 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *   [ 4, 3, 2, 7 ]
      * this path refers to the whole field declaration (from the beginning
      * of the label to the terminating semicolon).
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
      */
     private $path;
     private $has_path = false;
     /**
-     * <pre>
      * Always has exactly three or four elements: start line, start column,
      * end line (optional, otherwise assumed same as start line), end column.
      * These are packed into a single field for efficiency.  Note that line
      * and column numbers are zero-based -- typically you will want to add
      * 1 to each before displaying to a user.
-     * </pre>
      *
-     * <code>repeated int32 span = 2 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 span = 2 [packed = true];</code>
      */
     private $span;
     private $has_span = false;
     /**
-     * <pre>
      * If this SourceCodeInfo represents a complete declaration, these are any
      * comments appearing before and after the declaration which appear to be
      * attached to the declaration.
@@ -96,30 +90,103 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *    * grault. *&#47;
      *   optional int32 grault = 6;
      *   // ignored detached comments.
-     * </pre>
      *
-     * <code>optional string leading_comments = 3;</code>
+     * Generated from protobuf field <code>optional string leading_comments = 3;</code>
      */
     private $leading_comments = '';
     private $has_leading_comments = false;
     /**
-     * <code>optional string trailing_comments = 4;</code>
+     * Generated from protobuf field <code>optional string trailing_comments = 4;</code>
      */
     private $trailing_comments = '';
     private $has_trailing_comments = false;
     /**
-     * <code>repeated string leading_detached_comments = 6;</code>
+     * Generated from protobuf field <code>repeated string leading_detached_comments = 6;</code>
      */
     private $leading_detached_comments;
     private $has_leading_detached_comments = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int[]|\Google\Protobuf\Internal\RepeatedField $path
+     *           Identifies which part of the FileDescriptorProto was defined at this
+     *           location.
+     *           Each element is a field number or an index.  They form a path from
+     *           the root FileDescriptorProto to the place where the definition.  For
+     *           example, this path:
+     *             [ 4, 3, 2, 7, 1 ]
+     *           refers to:
+     *             file.message_type(3)  // 4, 3
+     *                 .field(7)         // 2, 7
+     *                 .name()           // 1
+     *           This is because FileDescriptorProto.message_type has field number 4:
+     *             repeated DescriptorProto message_type = 4;
+     *           and DescriptorProto.field has field number 2:
+     *             repeated FieldDescriptorProto field = 2;
+     *           and FieldDescriptorProto.name has field number 1:
+     *             optional string name = 1;
+     *           Thus, the above path gives the location of a field name.  If we removed
+     *           the last element:
+     *             [ 4, 3, 2, 7 ]
+     *           this path refers to the whole field declaration (from the beginning
+     *           of the label to the terminating semicolon).
+     *     @type int[]|\Google\Protobuf\Internal\RepeatedField $span
+     *           Always has exactly three or four elements: start line, start column,
+     *           end line (optional, otherwise assumed same as start line), end column.
+     *           These are packed into a single field for efficiency.  Note that line
+     *           and column numbers are zero-based -- typically you will want to add
+     *           1 to each before displaying to a user.
+     *     @type string $leading_comments
+     *           If this SourceCodeInfo represents a complete declaration, these are any
+     *           comments appearing before and after the declaration which appear to be
+     *           attached to the declaration.
+     *           A series of line comments appearing on consecutive lines, with no other
+     *           tokens appearing on those lines, will be treated as a single comment.
+     *           leading_detached_comments will keep paragraphs of comments that appear
+     *           before (but not connected to) the current element. Each paragraph,
+     *           separated by empty lines, will be one comment element in the repeated
+     *           field.
+     *           Only the comment content is provided; comment markers (e.g. //) are
+     *           stripped out.  For block comments, leading whitespace and an asterisk
+     *           will be stripped from the beginning of each line other than the first.
+     *           Newlines are included in the output.
+     *           Examples:
+     *             optional int32 foo = 1;  // Comment attached to foo.
+     *             // Comment attached to bar.
+     *             optional int32 bar = 2;
+     *             optional string baz = 3;
+     *             // Comment attached to baz.
+     *             // Another line attached to baz.
+     *             // Comment attached to qux.
+     *             //
+     *             // Another line attached to qux.
+     *             optional double qux = 4;
+     *             // Detached comment for corge. This is not leading or trailing comments
+     *             // to qux or corge because there are blank lines separating it from
+     *             // both.
+     *             // Detached comment for corge paragraph 2.
+     *             optional string corge = 5;
+     *             /&#42; Block comment attached
+     *              * to corge.  Leading asterisks
+     *              * will be removed. *&#47;
+     *             /&#42; Block comment attached to
+     *              * grault. *&#47;
+     *             optional int32 grault = 6;
+     *             // ignored detached comments.
+     *     @type string $trailing_comments
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $leading_detached_comments
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <pre>
      * Identifies which part of the FileDescriptorProto was defined at this
      * location.
      * Each element is a field number or an index.  They form a path from
@@ -141,9 +208,9 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *   [ 4, 3, 2, 7 ]
      * this path refers to the whole field declaration (from the beginning
      * of the label to the terminating semicolon).
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getPath()
     {
@@ -151,7 +218,6 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Identifies which part of the FileDescriptorProto was defined at this
      * location.
      * Each element is a field number or an index.  They form a path from
@@ -173,15 +239,18 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *   [ 4, 3, 2, 7 ]
      * this path refers to the whole field declaration (from the beginning
      * of the label to the terminating semicolon).
-     * </pre>
      *
-     * <code>repeated int32 path = 1 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 path = 1 [packed = true];</code>
+     * @param int[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setPath(&$var)
+    public function setPath($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
-        $this->path = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
+        $this->path = $arr;
         $this->has_path = true;
+
+        return $this;
     }
 
     public function hasPath()
@@ -190,15 +259,14 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Always has exactly three or four elements: start line, start column,
      * end line (optional, otherwise assumed same as start line), end column.
      * These are packed into a single field for efficiency.  Note that line
      * and column numbers are zero-based -- typically you will want to add
      * 1 to each before displaying to a user.
-     * </pre>
      *
-     * <code>repeated int32 span = 2 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 span = 2 [packed = true];</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getSpan()
     {
@@ -206,21 +274,23 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * Always has exactly three or four elements: start line, start column,
      * end line (optional, otherwise assumed same as start line), end column.
      * These are packed into a single field for efficiency.  Note that line
      * and column numbers are zero-based -- typically you will want to add
      * 1 to each before displaying to a user.
-     * </pre>
      *
-     * <code>repeated int32 span = 2 [packed = true];</code>
+     * Generated from protobuf field <code>repeated int32 span = 2 [packed = true];</code>
+     * @param int[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setSpan(&$var)
+    public function setSpan($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
-        $this->span = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::INT32);
+        $this->span = $arr;
         $this->has_span = true;
+
+        return $this;
     }
 
     public function hasSpan()
@@ -229,7 +299,6 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If this SourceCodeInfo represents a complete declaration, these are any
      * comments appearing before and after the declaration which appear to be
      * attached to the declaration.
@@ -266,9 +335,9 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *    * grault. *&#47;
      *   optional int32 grault = 6;
      *   // ignored detached comments.
-     * </pre>
      *
-     * <code>optional string leading_comments = 3;</code>
+     * Generated from protobuf field <code>optional string leading_comments = 3;</code>
+     * @return string
      */
     public function getLeadingComments()
     {
@@ -276,7 +345,6 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * If this SourceCodeInfo represents a complete declaration, these are any
      * comments appearing before and after the declaration which appear to be
      * attached to the declaration.
@@ -313,15 +381,18 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
      *    * grault. *&#47;
      *   optional int32 grault = 6;
      *   // ignored detached comments.
-     * </pre>
      *
-     * <code>optional string leading_comments = 3;</code>
+     * Generated from protobuf field <code>optional string leading_comments = 3;</code>
+     * @param string $var
+     * @return $this
      */
     public function setLeadingComments($var)
     {
         GPBUtil::checkString($var, True);
         $this->leading_comments = $var;
         $this->has_leading_comments = true;
+
+        return $this;
     }
 
     public function hasLeadingComments()
@@ -330,7 +401,8 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string trailing_comments = 4;</code>
+     * Generated from protobuf field <code>optional string trailing_comments = 4;</code>
+     * @return string
      */
     public function getTrailingComments()
     {
@@ -338,13 +410,17 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string trailing_comments = 4;</code>
+     * Generated from protobuf field <code>optional string trailing_comments = 4;</code>
+     * @param string $var
+     * @return $this
      */
     public function setTrailingComments($var)
     {
         GPBUtil::checkString($var, True);
         $this->trailing_comments = $var;
         $this->has_trailing_comments = true;
+
+        return $this;
     }
 
     public function hasTrailingComments()
@@ -353,7 +429,8 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated string leading_detached_comments = 6;</code>
+     * Generated from protobuf field <code>repeated string leading_detached_comments = 6;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getLeadingDetachedComments()
     {
@@ -361,13 +438,17 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated string leading_detached_comments = 6;</code>
+     * Generated from protobuf field <code>repeated string leading_detached_comments = 6;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setLeadingDetachedComments(&$var)
+    public function setLeadingDetachedComments($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
-        $this->leading_detached_comments = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->leading_detached_comments = $arr;
         $this->has_leading_detached_comments = true;
+
+        return $this;
     }
 
     public function hasLeadingDetachedComments()
@@ -377,3 +458,6 @@ class SourceCodeInfo_Location extends \Google\Protobuf\Internal\Message
 
 }
 
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(Location::class, \Google\Protobuf\Internal\SourceCodeInfo_Location::class);
+
diff --git a/php/src/Google/Protobuf/Internal/UninterpretedOption.php b/php/src/Google/Protobuf/Internal/UninterpretedOption.php
index c0f48310..3b517ec5 100644
--- a/php/src/Google/Protobuf/Internal/UninterpretedOption.php
+++ b/php/src/Google/Protobuf/Internal/UninterpretedOption.php
@@ -8,71 +8,84 @@ use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * A message representing a option the parser does not recognize. This only
  * appears in options protos created by the compiler::Parser class.
  * DescriptorPool resolves these when building Descriptor objects. Therefore,
  * options protos in descriptor objects (e.g. returned by Descriptor::options(),
  * or produced by Descriptor::CopyTo()) will never have UninterpretedOptions
  * in them.
- * </pre>
  *
- * Protobuf type <code>google.protobuf.UninterpretedOption</code>
+ * Generated from protobuf message <code>google.protobuf.UninterpretedOption</code>
  */
 class UninterpretedOption extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
      */
     private $name;
     private $has_name = false;
     /**
-     * <pre>
      * The value of the uninterpreted option, in whatever type the tokenizer
      * identified it as during parsing. Exactly one of these should be set.
-     * </pre>
      *
-     * <code>optional string identifier_value = 3;</code>
+     * Generated from protobuf field <code>optional string identifier_value = 3;</code>
      */
     private $identifier_value = '';
     private $has_identifier_value = false;
     /**
-     * <code>optional uint64 positive_int_value = 4;</code>
+     * Generated from protobuf field <code>optional uint64 positive_int_value = 4;</code>
      */
     private $positive_int_value = 0;
     private $has_positive_int_value = false;
     /**
-     * <code>optional int64 negative_int_value = 5;</code>
+     * Generated from protobuf field <code>optional int64 negative_int_value = 5;</code>
      */
     private $negative_int_value = 0;
     private $has_negative_int_value = false;
     /**
-     * <code>optional double double_value = 6;</code>
+     * Generated from protobuf field <code>optional double double_value = 6;</code>
      */
     private $double_value = 0.0;
     private $has_double_value = false;
     /**
-     * <code>optional bytes string_value = 7;</code>
+     * Generated from protobuf field <code>optional bytes string_value = 7;</code>
      */
     private $string_value = '';
     private $has_string_value = false;
     /**
-     * <code>optional string aggregate_value = 8;</code>
+     * Generated from protobuf field <code>optional string aggregate_value = 8;</code>
      */
     private $aggregate_value = '';
     private $has_aggregate_value = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Internal\UninterpretedOption\NamePart[]|\Google\Protobuf\Internal\RepeatedField $name
+     *     @type string $identifier_value
+     *           The value of the uninterpreted option, in whatever type the tokenizer
+     *           identified it as during parsing. Exactly one of these should be set.
+     *     @type int|string $positive_int_value
+     *     @type int|string $negative_int_value
+     *     @type float $double_value
+     *     @type string $string_value
+     *     @type string $aggregate_value
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
      */
     public function getName()
     {
@@ -80,13 +93,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
+     * Generated from protobuf field <code>repeated .google.protobuf.UninterpretedOption.NamePart name = 2;</code>
+     * @param \Google\Protobuf\Internal\UninterpretedOption\NamePart[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
      */
-    public function setName(&$var)
+    public function setName($var)
     {
-        GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption_NamePart::class);
-        $this->name = $var;
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Internal\UninterpretedOption\NamePart::class);
+        $this->name = $arr;
         $this->has_name = true;
+
+        return $this;
     }
 
     public function hasName()
@@ -95,12 +112,11 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The value of the uninterpreted option, in whatever type the tokenizer
      * identified it as during parsing. Exactly one of these should be set.
-     * </pre>
      *
-     * <code>optional string identifier_value = 3;</code>
+     * Generated from protobuf field <code>optional string identifier_value = 3;</code>
+     * @return string
      */
     public function getIdentifierValue()
     {
@@ -108,18 +124,20 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <pre>
      * The value of the uninterpreted option, in whatever type the tokenizer
      * identified it as during parsing. Exactly one of these should be set.
-     * </pre>
      *
-     * <code>optional string identifier_value = 3;</code>
+     * Generated from protobuf field <code>optional string identifier_value = 3;</code>
+     * @param string $var
+     * @return $this
      */
     public function setIdentifierValue($var)
     {
         GPBUtil::checkString($var, True);
         $this->identifier_value = $var;
         $this->has_identifier_value = true;
+
+        return $this;
     }
 
     public function hasIdentifierValue()
@@ -128,7 +146,8 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional uint64 positive_int_value = 4;</code>
+     * Generated from protobuf field <code>optional uint64 positive_int_value = 4;</code>
+     * @return int|string
      */
     public function getPositiveIntValue()
     {
@@ -136,13 +155,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional uint64 positive_int_value = 4;</code>
+     * Generated from protobuf field <code>optional uint64 positive_int_value = 4;</code>
+     * @param int|string $var
+     * @return $this
      */
     public function setPositiveIntValue($var)
     {
         GPBUtil::checkUint64($var);
         $this->positive_int_value = $var;
         $this->has_positive_int_value = true;
+
+        return $this;
     }
 
     public function hasPositiveIntValue()
@@ -151,7 +174,8 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int64 negative_int_value = 5;</code>
+     * Generated from protobuf field <code>optional int64 negative_int_value = 5;</code>
+     * @return int|string
      */
     public function getNegativeIntValue()
     {
@@ -159,13 +183,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional int64 negative_int_value = 5;</code>
+     * Generated from protobuf field <code>optional int64 negative_int_value = 5;</code>
+     * @param int|string $var
+     * @return $this
      */
     public function setNegativeIntValue($var)
     {
         GPBUtil::checkInt64($var);
         $this->negative_int_value = $var;
         $this->has_negative_int_value = true;
+
+        return $this;
     }
 
     public function hasNegativeIntValue()
@@ -174,7 +202,8 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional double double_value = 6;</code>
+     * Generated from protobuf field <code>optional double double_value = 6;</code>
+     * @return float
      */
     public function getDoubleValue()
     {
@@ -182,13 +211,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional double double_value = 6;</code>
+     * Generated from protobuf field <code>optional double double_value = 6;</code>
+     * @param float $var
+     * @return $this
      */
     public function setDoubleValue($var)
     {
         GPBUtil::checkDouble($var);
         $this->double_value = $var;
         $this->has_double_value = true;
+
+        return $this;
     }
 
     public function hasDoubleValue()
@@ -197,7 +230,8 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bytes string_value = 7;</code>
+     * Generated from protobuf field <code>optional bytes string_value = 7;</code>
+     * @return string
      */
     public function getStringValue()
     {
@@ -205,13 +239,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional bytes string_value = 7;</code>
+     * Generated from protobuf field <code>optional bytes string_value = 7;</code>
+     * @param string $var
+     * @return $this
      */
     public function setStringValue($var)
     {
         GPBUtil::checkString($var, False);
         $this->string_value = $var;
         $this->has_string_value = true;
+
+        return $this;
     }
 
     public function hasStringValue()
@@ -220,7 +258,8 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string aggregate_value = 8;</code>
+     * Generated from protobuf field <code>optional string aggregate_value = 8;</code>
+     * @return string
      */
     public function getAggregateValue()
     {
@@ -228,13 +267,17 @@ class UninterpretedOption extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>optional string aggregate_value = 8;</code>
+     * Generated from protobuf field <code>optional string aggregate_value = 8;</code>
+     * @param string $var
+     * @return $this
      */
     public function setAggregateValue($var)
     {
         GPBUtil::checkString($var, True);
         $this->aggregate_value = $var;
         $this->has_aggregate_value = true;
+
+        return $this;
     }
 
     public function hasAggregateValue()
diff --git a/php/src/Google/Protobuf/Internal/UninterpretedOption_NamePart.php b/php/src/Google/Protobuf/Internal/UninterpretedOption/NamePart.php
index 86484d23..92ee4b44 100644
--- a/php/src/Google/Protobuf/Internal/UninterpretedOption_NamePart.php
+++ b/php/src/Google/Protobuf/Internal/UninterpretedOption/NamePart.php
@@ -2,46 +2,54 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/protobuf/descriptor.proto
 
-namespace Google\Protobuf\Internal;
+namespace Google\Protobuf\Internal\UninterpretedOption;
 
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\InputStream;
-
 use Google\Protobuf\Internal\GPBUtil;
 
 /**
- * <pre>
  * The name of the uninterpreted option.  Each string represents a segment in
  * a dot-separated name.  is_extension is true iff a segment represents an
  * extension (denoted with parentheses in options specs in .proto files).
  * E.g.,{ ["foo", false], ["bar.baz", true], ["qux", false] } represents
  * "foo.(bar.baz).qux".
- * </pre>
  *
- * Protobuf type <code>google.protobuf.UninterpretedOption.NamePart</code>
+ * Generated from protobuf message <code>google.protobuf.UninterpretedOption.NamePart</code>
  */
-class UninterpretedOption_NamePart extends \Google\Protobuf\Internal\Message
+class NamePart extends \Google\Protobuf\Internal\Message
 {
     /**
-     * <code>required string name_part = 1;</code>
+     * Generated from protobuf field <code>required string name_part = 1;</code>
      */
     private $name_part = '';
     private $has_name_part = false;
     /**
-     * <code>required bool is_extension = 2;</code>
+     * Generated from protobuf field <code>required bool is_extension = 2;</code>
      */
     private $is_extension = false;
     private $has_is_extension = false;
 
-    public function __construct() {
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name_part
+     *     @type bool $is_extension
+     * }
+     */
+    public function __construct($data = NULL) {
         \GPBMetadata\Google\Protobuf\Internal\Descriptor::initOnce();
-        parent::__construct();
+        parent::__construct($data);
     }
 
     /**
-     * <code>required string name_part = 1;</code>
+     * Generated from protobuf field <code>required string name_part = 1;</code>
+     * @return string
      */
     public function getNamePart()
     {
@@ -49,13 +57,17 @@ class UninterpretedOption_NamePart extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>required string name_part = 1;</code>
+     * Generated from protobuf field <code>required string name_part = 1;</code>
+     * @param string $var
+     * @return $this
      */
     public function setNamePart($var)
     {
         GPBUtil::checkString($var, True);
         $this->name_part = $var;
         $this->has_name_part = true;
+
+        return $this;
     }
 
     public function hasNamePart()
@@ -64,7 +76,8 @@ class UninterpretedOption_NamePart extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>required bool is_extension = 2;</code>
+     * Generated from protobuf field <code>required bool is_extension = 2;</code>
+     * @return bool
      */
     public function getIsExtension()
     {
@@ -72,13 +85,17 @@ class UninterpretedOption_NamePart extends \Google\Protobuf\Internal\Message
     }
 
     /**
-     * <code>required bool is_extension = 2;</code>
+     * Generated from protobuf field <code>required bool is_extension = 2;</code>
+     * @param bool $var
+     * @return $this
      */
     public function setIsExtension($var)
     {
         GPBUtil::checkBool($var);
         $this->is_extension = $var;
         $this->has_is_extension = true;
+
+        return $this;
     }
 
     public function hasIsExtension()
@@ -88,3 +105,6 @@ class UninterpretedOption_NamePart extends \Google\Protobuf\Internal\Message
 
 }
 
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(NamePart::class, \Google\Protobuf\Internal\UninterpretedOption_NamePart::class);
+
diff --git a/php/src/Google/Protobuf/ListValue.php b/php/src/Google/Protobuf/ListValue.php
new file mode 100644
index 00000000..70f54232
--- /dev/null
+++ b/php/src/Google/Protobuf/ListValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `ListValue` is a wrapper around a repeated field of values.
+ * The JSON representation for `ListValue` is JSON array.
+ *
+ * Generated from protobuf message <code>google.protobuf.ListValue</code>
+ */
+class ListValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Repeated field of dynamically typed values.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Value values = 1;</code>
+     */
+    private $values;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type \Google\Protobuf\Value[]|\Google\Protobuf\Internal\RepeatedField $values
+     *           Repeated field of dynamically typed values.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Struct::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Repeated field of dynamically typed values.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Value values = 1;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getValues()
+    {
+        return $this->values;
+    }
+
+    /**
+     * Repeated field of dynamically typed values.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Value values = 1;</code>
+     * @param \Google\Protobuf\Value[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setValues($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Value::class);
+        $this->values = $arr;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Method.php b/php/src/Google/Protobuf/Method.php
new file mode 100644
index 00000000..8e803506
--- /dev/null
+++ b/php/src/Google/Protobuf/Method.php
@@ -0,0 +1,271 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/api.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Method represents a method of an API interface.
+ *
+ * Generated from protobuf message <code>google.protobuf.Method</code>
+ */
+class Method extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The simple name of this method.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * A URL of the input message type.
+     *
+     * Generated from protobuf field <code>string request_type_url = 2;</code>
+     */
+    private $request_type_url = '';
+    /**
+     * If true, the request is streamed.
+     *
+     * Generated from protobuf field <code>bool request_streaming = 3;</code>
+     */
+    private $request_streaming = false;
+    /**
+     * The URL of the output message type.
+     *
+     * Generated from protobuf field <code>string response_type_url = 4;</code>
+     */
+    private $response_type_url = '';
+    /**
+     * If true, the response is streamed.
+     *
+     * Generated from protobuf field <code>bool response_streaming = 5;</code>
+     */
+    private $response_streaming = false;
+    /**
+     * Any metadata attached to the method.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 6;</code>
+     */
+    private $options;
+    /**
+     * The source syntax of this method.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     */
+    private $syntax = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           The simple name of this method.
+     *     @type string $request_type_url
+     *           A URL of the input message type.
+     *     @type bool $request_streaming
+     *           If true, the request is streamed.
+     *     @type string $response_type_url
+     *           The URL of the output message type.
+     *     @type bool $response_streaming
+     *           If true, the response is streamed.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           Any metadata attached to the method.
+     *     @type int $syntax
+     *           The source syntax of this method.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Api::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The simple name of this method.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The simple name of this method.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * A URL of the input message type.
+     *
+     * Generated from protobuf field <code>string request_type_url = 2;</code>
+     * @return string
+     */
+    public function getRequestTypeUrl()
+    {
+        return $this->request_type_url;
+    }
+
+    /**
+     * A URL of the input message type.
+     *
+     * Generated from protobuf field <code>string request_type_url = 2;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setRequestTypeUrl($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->request_type_url = $var;
+
+        return $this;
+    }
+
+    /**
+     * If true, the request is streamed.
+     *
+     * Generated from protobuf field <code>bool request_streaming = 3;</code>
+     * @return bool
+     */
+    public function getRequestStreaming()
+    {
+        return $this->request_streaming;
+    }
+
+    /**
+     * If true, the request is streamed.
+     *
+     * Generated from protobuf field <code>bool request_streaming = 3;</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setRequestStreaming($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->request_streaming = $var;
+
+        return $this;
+    }
+
+    /**
+     * The URL of the output message type.
+     *
+     * Generated from protobuf field <code>string response_type_url = 4;</code>
+     * @return string
+     */
+    public function getResponseTypeUrl()
+    {
+        return $this->response_type_url;
+    }
+
+    /**
+     * The URL of the output message type.
+     *
+     * Generated from protobuf field <code>string response_type_url = 4;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setResponseTypeUrl($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->response_type_url = $var;
+
+        return $this;
+    }
+
+    /**
+     * If true, the response is streamed.
+     *
+     * Generated from protobuf field <code>bool response_streaming = 5;</code>
+     * @return bool
+     */
+    public function getResponseStreaming()
+    {
+        return $this->response_streaming;
+    }
+
+    /**
+     * If true, the response is streamed.
+     *
+     * Generated from protobuf field <code>bool response_streaming = 5;</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setResponseStreaming($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->response_streaming = $var;
+
+        return $this;
+    }
+
+    /**
+     * Any metadata attached to the method.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 6;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * Any metadata attached to the method.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 6;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The source syntax of this method.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     * @return int
+     */
+    public function getSyntax()
+    {
+        return $this->syntax;
+    }
+
+    /**
+     * The source syntax of this method.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 7;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setSyntax($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Syntax::class);
+        $this->syntax = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Mixin.php b/php/src/Google/Protobuf/Mixin.php
new file mode 100644
index 00000000..a2ea59c7
--- /dev/null
+++ b/php/src/Google/Protobuf/Mixin.php
@@ -0,0 +1,166 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/api.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Declares an API Interface to be included in this interface. The including
+ * interface must redeclare all the methods from the included interface, but
+ * documentation and options are inherited as follows:
+ * - If after comment and whitespace stripping, the documentation
+ *   string of the redeclared method is empty, it will be inherited
+ *   from the original method.
+ * - Each annotation belonging to the service config (http,
+ *   visibility) which is not set in the redeclared method will be
+ *   inherited.
+ * - If an http annotation is inherited, the path pattern will be
+ *   modified as follows. Any version prefix will be replaced by the
+ *   version of the including interface plus the [root][] path if
+ *   specified.
+ * Example of a simple mixin:
+ *     package google.acl.v1;
+ *     service AccessControl {
+ *       // Get the underlying ACL object.
+ *       rpc GetAcl(GetAclRequest) returns (Acl) {
+ *         option (google.api.http).get = "/v1/{resource=**}:getAcl";
+ *       }
+ *     }
+ *     package google.storage.v2;
+ *     service Storage {
+ *       rpc GetAcl(GetAclRequest) returns (Acl);
+ *       // Get a data record.
+ *       rpc GetData(GetDataRequest) returns (Data) {
+ *         option (google.api.http).get = "/v2/{resource=**}";
+ *       }
+ *     }
+ * Example of a mixin configuration:
+ *     apis:
+ *     - name: google.storage.v2.Storage
+ *       mixins:
+ *       - name: google.acl.v1.AccessControl
+ * The mixin construct implies that all methods in `AccessControl` are
+ * also declared with same name and request/response types in
+ * `Storage`. A documentation generator or annotation processor will
+ * see the effective `Storage.GetAcl` method after inherting
+ * documentation and annotations as follows:
+ *     service Storage {
+ *       // Get the underlying ACL object.
+ *       rpc GetAcl(GetAclRequest) returns (Acl) {
+ *         option (google.api.http).get = "/v2/{resource=**}:getAcl";
+ *       }
+ *       ...
+ *     }
+ * Note how the version in the path pattern changed from `v1` to `v2`.
+ * If the `root` field in the mixin is specified, it should be a
+ * relative path under which inherited HTTP paths are placed. Example:
+ *     apis:
+ *     - name: google.storage.v2.Storage
+ *       mixins:
+ *       - name: google.acl.v1.AccessControl
+ *         root: acls
+ * This implies the following inherited HTTP annotation:
+ *     service Storage {
+ *       // Get the underlying ACL object.
+ *       rpc GetAcl(GetAclRequest) returns (Acl) {
+ *         option (google.api.http).get = "/v2/acls/{resource=**}:getAcl";
+ *       }
+ *       ...
+ *     }
+ *
+ * Generated from protobuf message <code>google.protobuf.Mixin</code>
+ */
+class Mixin extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The fully qualified name of the interface which is included.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * If non-empty specifies a path under which inherited HTTP paths
+     * are rooted.
+     *
+     * Generated from protobuf field <code>string root = 2;</code>
+     */
+    private $root = '';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           The fully qualified name of the interface which is included.
+     *     @type string $root
+     *           If non-empty specifies a path under which inherited HTTP paths
+     *           are rooted.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Api::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The fully qualified name of the interface which is included.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The fully qualified name of the interface which is included.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * If non-empty specifies a path under which inherited HTTP paths
+     * are rooted.
+     *
+     * Generated from protobuf field <code>string root = 2;</code>
+     * @return string
+     */
+    public function getRoot()
+    {
+        return $this->root;
+    }
+
+    /**
+     * If non-empty specifies a path under which inherited HTTP paths
+     * are rooted.
+     *
+     * Generated from protobuf field <code>string root = 2;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setRoot($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->root = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/NullValue.php b/php/src/Google/Protobuf/NullValue.php
new file mode 100644
index 00000000..482b80dd
--- /dev/null
+++ b/php/src/Google/Protobuf/NullValue.php
@@ -0,0 +1,23 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+
+namespace Google\Protobuf;
+
+/**
+ * `NullValue` is a singleton enumeration to represent the null value for the
+ * `Value` type union.
+ *  The JSON representation for `NullValue` is JSON `null`.
+ *
+ * Protobuf type <code>google.protobuf.NullValue</code>
+ */
+class NullValue
+{
+    /**
+     * Null value.
+     *
+     * Generated from protobuf enum <code>NULL_VALUE = 0;</code>
+     */
+    const NULL_VALUE = 0;
+}
+
diff --git a/php/src/Google/Protobuf/OneofDescriptor.php b/php/src/Google/Protobuf/OneofDescriptor.php
new file mode 100644
index 00000000..d9736634
--- /dev/null
+++ b/php/src/Google/Protobuf/OneofDescriptor.php
@@ -0,0 +1,75 @@
+<?php
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2017 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GetPublicDescriptorTrait;
+
+class OneofDescriptor
+{
+    use GetPublicDescriptorTrait;
+
+    private $internal_desc;
+
+    /**
+     * @internal
+     */
+    public function __construct($internal_desc)
+    {
+        $this->internal_desc = $internal_desc;
+    }
+
+    /**
+     * @return string The name of the oneof
+     */
+    public function getName()
+    {
+        return $this->internal_desc->getName();
+    }
+
+    /**
+     * @param int $index Must be >= 0 and < getFieldCount()
+     * @return FieldDescriptor
+     */
+    public function getField($index)
+    {
+        return $this->getPublicDescriptor($this->internal_desc->getFields()[$index]);
+    }
+
+    /**
+     * @return int Number of fields in the oneof
+     */
+    public function getFieldCount()
+    {
+        return count($this->internal_desc->getFields());
+    }
+}
diff --git a/php/src/Google/Protobuf/Option.php b/php/src/Google/Protobuf/Option.php
new file mode 100644
index 00000000..22ecfc5f
--- /dev/null
+++ b/php/src/Google/Protobuf/Option.php
@@ -0,0 +1,126 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A protocol buffer option, which can be attached to a message, field,
+ * enumeration, etc.
+ *
+ * Generated from protobuf message <code>google.protobuf.Option</code>
+ */
+class Option extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The option's name. For protobuf built-in options (options defined in
+     * descriptor.proto), this is the short name. For example, `"map_entry"`.
+     * For custom options, it should be the fully-qualified name. For example,
+     * `"google.api.http"`.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * The option's value packed in an Any message. If the value is a primitive,
+     * the corresponding wrapper type defined in google/protobuf/wrappers.proto
+     * should be used. If the value is an enum, it should be stored as an int32
+     * value using the google.protobuf.Int32Value type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Any value = 2;</code>
+     */
+    private $value = null;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           The option's name. For protobuf built-in options (options defined in
+     *           descriptor.proto), this is the short name. For example, `"map_entry"`.
+     *           For custom options, it should be the fully-qualified name. For example,
+     *           `"google.api.http"`.
+     *     @type \Google\Protobuf\Any $value
+     *           The option's value packed in an Any message. If the value is a primitive,
+     *           the corresponding wrapper type defined in google/protobuf/wrappers.proto
+     *           should be used. If the value is an enum, it should be stored as an int32
+     *           value using the google.protobuf.Int32Value type.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The option's name. For protobuf built-in options (options defined in
+     * descriptor.proto), this is the short name. For example, `"map_entry"`.
+     * For custom options, it should be the fully-qualified name. For example,
+     * `"google.api.http"`.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The option's name. For protobuf built-in options (options defined in
+     * descriptor.proto), this is the short name. For example, `"map_entry"`.
+     * For custom options, it should be the fully-qualified name. For example,
+     * `"google.api.http"`.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * The option's value packed in an Any message. If the value is a primitive,
+     * the corresponding wrapper type defined in google/protobuf/wrappers.proto
+     * should be used. If the value is an enum, it should be stored as an int32
+     * value using the google.protobuf.Int32Value type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Any value = 2;</code>
+     * @return \Google\Protobuf\Any
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The option's value packed in an Any message. If the value is a primitive,
+     * the corresponding wrapper type defined in google/protobuf/wrappers.proto
+     * should be used. If the value is an enum, it should be stored as an int32
+     * value using the google.protobuf.Int32Value type.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Any value = 2;</code>
+     * @param \Google\Protobuf\Any $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\Any::class);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/SourceContext.php b/php/src/Google/Protobuf/SourceContext.php
new file mode 100644
index 00000000..cbc50c68
--- /dev/null
+++ b/php/src/Google/Protobuf/SourceContext.php
@@ -0,0 +1,72 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/source_context.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `SourceContext` represents information about the source of a
+ * protobuf element, like the file in which it is defined.
+ *
+ * Generated from protobuf message <code>google.protobuf.SourceContext</code>
+ */
+class SourceContext extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The path-qualified name of the .proto file that contained the associated
+     * protobuf element.  For example: `"google/protobuf/source_context.proto"`.
+     *
+     * Generated from protobuf field <code>string file_name = 1;</code>
+     */
+    private $file_name = '';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $file_name
+     *           The path-qualified name of the .proto file that contained the associated
+     *           protobuf element.  For example: `"google/protobuf/source_context.proto"`.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\SourceContext::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The path-qualified name of the .proto file that contained the associated
+     * protobuf element.  For example: `"google/protobuf/source_context.proto"`.
+     *
+     * Generated from protobuf field <code>string file_name = 1;</code>
+     * @return string
+     */
+    public function getFileName()
+    {
+        return $this->file_name;
+    }
+
+    /**
+     * The path-qualified name of the .proto file that contained the associated
+     * protobuf element.  For example: `"google/protobuf/source_context.proto"`.
+     *
+     * Generated from protobuf field <code>string file_name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setFileName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->file_name = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/StringValue.php b/php/src/Google/Protobuf/StringValue.php
new file mode 100644
index 00000000..8fb354f3
--- /dev/null
+++ b/php/src/Google/Protobuf/StringValue.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `string`.
+ * The JSON representation for `StringValue` is JSON string.
+ *
+ * Generated from protobuf message <code>google.protobuf.StringValue</code>
+ */
+class StringValue extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The string value.
+     *
+     * Generated from protobuf field <code>string value = 1;</code>
+     */
+    private $value = '';
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $value
+     *           The string value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The string value.
+     *
+     * Generated from protobuf field <code>string value = 1;</code>
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The string value.
+     *
+     * Generated from protobuf field <code>string value = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Struct.php b/php/src/Google/Protobuf/Struct.php
new file mode 100644
index 00000000..0456541c
--- /dev/null
+++ b/php/src/Google/Protobuf/Struct.php
@@ -0,0 +1,73 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `Struct` represents a structured data value, consisting of fields
+ * which map to dynamically typed values. In some languages, `Struct`
+ * might be supported by a native representation. For example, in
+ * scripting languages like JS a struct is represented as an
+ * object. The details of that representation are described together
+ * with the proto support for the language.
+ * The JSON representation for `Struct` is JSON object.
+ *
+ * Generated from protobuf message <code>google.protobuf.Struct</code>
+ */
+class Struct extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Unordered map of dynamically typed values.
+     *
+     * Generated from protobuf field <code>map<string, .google.protobuf.Value> fields = 1;</code>
+     */
+    private $fields;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type array|\Google\Protobuf\Internal\MapField $fields
+     *           Unordered map of dynamically typed values.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Struct::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Unordered map of dynamically typed values.
+     *
+     * Generated from protobuf field <code>map<string, .google.protobuf.Value> fields = 1;</code>
+     * @return \Google\Protobuf\Internal\MapField
+     */
+    public function getFields()
+    {
+        return $this->fields;
+    }
+
+    /**
+     * Unordered map of dynamically typed values.
+     *
+     * Generated from protobuf field <code>map<string, .google.protobuf.Value> fields = 1;</code>
+     * @param array|\Google\Protobuf\Internal\MapField $var
+     * @return $this
+     */
+    public function setFields($var)
+    {
+        $arr = GPBUtil::checkMapField($var, \Google\Protobuf\Internal\GPBType::STRING, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Value::class);
+        $this->fields = $arr;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Syntax.php b/php/src/Google/Protobuf/Syntax.php
new file mode 100644
index 00000000..3a52dc9e
--- /dev/null
+++ b/php/src/Google/Protobuf/Syntax.php
@@ -0,0 +1,27 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+/**
+ * The syntax in which a protocol buffer element is defined.
+ *
+ * Protobuf type <code>google.protobuf.Syntax</code>
+ */
+class Syntax
+{
+    /**
+     * Syntax `proto2`.
+     *
+     * Generated from protobuf enum <code>SYNTAX_PROTO2 = 0;</code>
+     */
+    const SYNTAX_PROTO2 = 0;
+    /**
+     * Syntax `proto3`.
+     *
+     * Generated from protobuf enum <code>SYNTAX_PROTO3 = 1;</code>
+     */
+    const SYNTAX_PROTO3 = 1;
+}
+
diff --git a/php/src/Google/Protobuf/Timestamp.php b/php/src/Google/Protobuf/Timestamp.php
new file mode 100644
index 00000000..a793c7e3
--- /dev/null
+++ b/php/src/Google/Protobuf/Timestamp.php
@@ -0,0 +1,199 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/timestamp.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A Timestamp represents a point in time independent of any time zone
+ * or calendar, represented as seconds and fractions of seconds at
+ * nanosecond resolution in UTC Epoch time. It is encoded using the
+ * Proleptic Gregorian Calendar which extends the Gregorian calendar
+ * backwards to year one. It is encoded assuming all minutes are 60
+ * seconds long, i.e. leap seconds are "smeared" so that no leap second
+ * table is needed for interpretation. Range is from
+ * 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z.
+ * By restricting to that range, we ensure that we can convert to
+ * and from  RFC 3339 date strings.
+ * See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
+ * # Examples
+ * Example 1: Compute Timestamp from POSIX `time()`.
+ *     Timestamp timestamp;
+ *     timestamp.set_seconds(time(NULL));
+ *     timestamp.set_nanos(0);
+ * Example 2: Compute Timestamp from POSIX `gettimeofday()`.
+ *     struct timeval tv;
+ *     gettimeofday(&tv, NULL);
+ *     Timestamp timestamp;
+ *     timestamp.set_seconds(tv.tv_sec);
+ *     timestamp.set_nanos(tv.tv_usec * 1000);
+ * Example 3: Compute Timestamp from Win32 `GetSystemTimeAsFileTime()`.
+ *     FILETIME ft;
+ *     GetSystemTimeAsFileTime(&ft);
+ *     UINT64 ticks = (((UINT64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
+ *     // A Windows tick is 100 nanoseconds. Windows epoch 1601-01-01T00:00:00Z
+ *     // is 11644473600 seconds before Unix epoch 1970-01-01T00:00:00Z.
+ *     Timestamp timestamp;
+ *     timestamp.set_seconds((INT64) ((ticks / 10000000) - 11644473600LL));
+ *     timestamp.set_nanos((INT32) ((ticks % 10000000) * 100));
+ * Example 4: Compute Timestamp from Java `System.currentTimeMillis()`.
+ *     long millis = System.currentTimeMillis();
+ *     Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
+ *         .setNanos((int) ((millis % 1000) * 1000000)).build();
+ * Example 5: Compute Timestamp from current time in Python.
+ *     timestamp = Timestamp()
+ *     timestamp.GetCurrentTime()
+ * # JSON Mapping
+ * In JSON format, the Timestamp type is encoded as a string in the
+ * [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+ * format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+ * where {year} is always expressed using four digits while {month}, {day},
+ * {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+ * seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+ * are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+ * is required. A proto3 JSON serializer should always use UTC (as indicated by
+ * "Z") when printing the Timestamp type and a proto3 JSON parser should be
+ * able to accept both UTC and other timezones (as indicated by an offset).
+ * For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+ * 01:30 UTC on January 15, 2017.
+ * In JavaScript, one can convert a Date object to this format using the
+ * standard [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString]
+ * method. In Python, a standard `datetime.datetime` object can be converted
+ * to this format using [`strftime`](https://docs.python.org/2/library/time.html#time.strftime)
+ * with the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one
+ * can use the Joda Time's [`ISODateTimeFormat.dateTime()`](
+ * http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime--
+ * ) to obtain a formatter capable of generating timestamps in this format.
+ *
+ * Generated from protobuf message <code>google.protobuf.Timestamp</code>
+ */
+class Timestamp extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * Represents seconds of UTC time since Unix epoch
+     * 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+     * 9999-12-31T23:59:59Z inclusive.
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     */
+    private $seconds = 0;
+    /**
+     * Non-negative fractions of a second at nanosecond resolution. Negative
+     * second values with fractions must still have non-negative nanos values
+     * that count forward in time. Must be from 0 to 999,999,999
+     * inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     */
+    private $nanos = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int|string $seconds
+     *           Represents seconds of UTC time since Unix epoch
+     *           1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+     *           9999-12-31T23:59:59Z inclusive.
+     *     @type int $nanos
+     *           Non-negative fractions of a second at nanosecond resolution. Negative
+     *           second values with fractions must still have non-negative nanos values
+     *           that count forward in time. Must be from 0 to 999,999,999
+     *           inclusive.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Timestamp::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Represents seconds of UTC time since Unix epoch
+     * 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+     * 9999-12-31T23:59:59Z inclusive.
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     * @return int|string
+     */
+    public function getSeconds()
+    {
+        return $this->seconds;
+    }
+
+    /**
+     * Represents seconds of UTC time since Unix epoch
+     * 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+     * 9999-12-31T23:59:59Z inclusive.
+     *
+     * Generated from protobuf field <code>int64 seconds = 1;</code>
+     * @param int|string $var
+     * @return $this
+     */
+    public function setSeconds($var)
+    {
+        GPBUtil::checkInt64($var);
+        $this->seconds = $var;
+
+        return $this;
+    }
+
+    /**
+     * Non-negative fractions of a second at nanosecond resolution. Negative
+     * second values with fractions must still have non-negative nanos values
+     * that count forward in time. Must be from 0 to 999,999,999
+     * inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     * @return int
+     */
+    public function getNanos()
+    {
+        return $this->nanos;
+    }
+
+    /**
+     * Non-negative fractions of a second at nanosecond resolution. Negative
+     * second values with fractions must still have non-negative nanos values
+     * that count forward in time. Must be from 0 to 999,999,999
+     * inclusive.
+     *
+     * Generated from protobuf field <code>int32 nanos = 2;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setNanos($var)
+    {
+        GPBUtil::checkInt32($var);
+        $this->nanos = $var;
+
+        return $this;
+    }
+
+    /*
+     * Converts PHP DateTime to Timestamp.
+     *
+     * @param \DateTime $datetime
+     */
+    public function fromDateTime(\DateTime $datetime)
+    {
+        $this->seconds = $datetime->format('U');
+        $this->nanos = 0;
+    }
+
+    /**
+     * Converts Timestamp to PHP DateTime. Nano second is ignored.
+     *
+     * @return \DateTime $datetime
+     */
+    public function toDateTime()
+    {
+        return \DateTime::createFromFormat('U', $this->seconds);
+    }
+}
+
diff --git a/php/src/Google/Protobuf/Type.php b/php/src/Google/Protobuf/Type.php
new file mode 100644
index 00000000..1b478110
--- /dev/null
+++ b/php/src/Google/Protobuf/Type.php
@@ -0,0 +1,237 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * A protocol buffer message type.
+ *
+ * Generated from protobuf message <code>google.protobuf.Type</code>
+ */
+class Type extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The fully qualified message name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     */
+    private $name = '';
+    /**
+     * The list of fields.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Field fields = 2;</code>
+     */
+    private $fields;
+    /**
+     * The list of types appearing in `oneof` definitions in this type.
+     *
+     * Generated from protobuf field <code>repeated string oneofs = 3;</code>
+     */
+    private $oneofs;
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 4;</code>
+     */
+    private $options;
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     */
+    private $source_context = null;
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 6;</code>
+     */
+    private $syntax = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type string $name
+     *           The fully qualified message name.
+     *     @type \Google\Protobuf\Field[]|\Google\Protobuf\Internal\RepeatedField $fields
+     *           The list of fields.
+     *     @type string[]|\Google\Protobuf\Internal\RepeatedField $oneofs
+     *           The list of types appearing in `oneof` definitions in this type.
+     *     @type \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $options
+     *           The protocol buffer options.
+     *     @type \Google\Protobuf\SourceContext $source_context
+     *           The source context.
+     *     @type int $syntax
+     *           The source syntax.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Type::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The fully qualified message name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * The fully qualified message name.
+     *
+     * Generated from protobuf field <code>string name = 1;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setName($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->name = $var;
+
+        return $this;
+    }
+
+    /**
+     * The list of fields.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Field fields = 2;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getFields()
+    {
+        return $this->fields;
+    }
+
+    /**
+     * The list of fields.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Field fields = 2;</code>
+     * @param \Google\Protobuf\Field[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setFields($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Field::class);
+        $this->fields = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The list of types appearing in `oneof` definitions in this type.
+     *
+     * Generated from protobuf field <code>repeated string oneofs = 3;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOneofs()
+    {
+        return $this->oneofs;
+    }
+
+    /**
+     * The list of types appearing in `oneof` definitions in this type.
+     *
+     * Generated from protobuf field <code>repeated string oneofs = 3;</code>
+     * @param string[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOneofs($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::STRING);
+        $this->oneofs = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 4;</code>
+     * @return \Google\Protobuf\Internal\RepeatedField
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    /**
+     * The protocol buffer options.
+     *
+     * Generated from protobuf field <code>repeated .google.protobuf.Option options = 4;</code>
+     * @param \Google\Protobuf\Option[]|\Google\Protobuf\Internal\RepeatedField $var
+     * @return $this
+     */
+    public function setOptions($var)
+    {
+        $arr = GPBUtil::checkRepeatedField($var, \Google\Protobuf\Internal\GPBType::MESSAGE, \Google\Protobuf\Option::class);
+        $this->options = $arr;
+
+        return $this;
+    }
+
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     * @return \Google\Protobuf\SourceContext
+     */
+    public function getSourceContext()
+    {
+        return $this->source_context;
+    }
+
+    /**
+     * The source context.
+     *
+     * Generated from protobuf field <code>.google.protobuf.SourceContext source_context = 5;</code>
+     * @param \Google\Protobuf\SourceContext $var
+     * @return $this
+     */
+    public function setSourceContext($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\SourceContext::class);
+        $this->source_context = $var;
+
+        return $this;
+    }
+
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 6;</code>
+     * @return int
+     */
+    public function getSyntax()
+    {
+        return $this->syntax;
+    }
+
+    /**
+     * The source syntax.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Syntax syntax = 6;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setSyntax($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\Syntax::class);
+        $this->syntax = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/UInt32Value.php b/php/src/Google/Protobuf/UInt32Value.php
new file mode 100644
index 00000000..f5a522d2
--- /dev/null
+++ b/php/src/Google/Protobuf/UInt32Value.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `uint32`.
+ * The JSON representation for `UInt32Value` is JSON number.
+ *
+ * Generated from protobuf message <code>google.protobuf.UInt32Value</code>
+ */
+class UInt32Value extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The uint32 value.
+     *
+     * Generated from protobuf field <code>uint32 value = 1;</code>
+     */
+    private $value = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $value
+     *           The uint32 value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The uint32 value.
+     *
+     * Generated from protobuf field <code>uint32 value = 1;</code>
+     * @return int
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The uint32 value.
+     *
+     * Generated from protobuf field <code>uint32 value = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkUint32($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/UInt64Value.php b/php/src/Google/Protobuf/UInt64Value.php
new file mode 100644
index 00000000..89e69cd8
--- /dev/null
+++ b/php/src/Google/Protobuf/UInt64Value.php
@@ -0,0 +1,68 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/wrappers.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * Wrapper message for `uint64`.
+ * The JSON representation for `UInt64Value` is JSON string.
+ *
+ * Generated from protobuf message <code>google.protobuf.UInt64Value</code>
+ */
+class UInt64Value extends \Google\Protobuf\Internal\Message
+{
+    /**
+     * The uint64 value.
+     *
+     * Generated from protobuf field <code>uint64 value = 1;</code>
+     */
+    private $value = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int|string $value
+     *           The uint64 value.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Wrappers::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * The uint64 value.
+     *
+     * Generated from protobuf field <code>uint64 value = 1;</code>
+     * @return int|string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * The uint64 value.
+     *
+     * Generated from protobuf field <code>uint64 value = 1;</code>
+     * @param int|string $var
+     * @return $this
+     */
+    public function setValue($var)
+    {
+        GPBUtil::checkUint64($var);
+        $this->value = $var;
+
+        return $this;
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/Value.php b/php/src/Google/Protobuf/Value.php
new file mode 100644
index 00000000..5c1e864c
--- /dev/null
+++ b/php/src/Google/Protobuf/Value.php
@@ -0,0 +1,214 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/struct.proto
+
+namespace Google\Protobuf;
+
+use Google\Protobuf\Internal\GPBType;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBUtil;
+
+/**
+ * `Value` represents a dynamically typed value which can be either
+ * null, a number, a string, a boolean, a recursive struct value, or a
+ * list of values. A producer of value is expected to set one of that
+ * variants, absence of any variant indicates an error.
+ * The JSON representation for `Value` is JSON value.
+ *
+ * Generated from protobuf message <code>google.protobuf.Value</code>
+ */
+class Value extends \Google\Protobuf\Internal\Message
+{
+    protected $kind;
+
+    /**
+     * Constructor.
+     *
+     * @param array $data {
+     *     Optional. Data for populating the Message object.
+     *
+     *     @type int $null_value
+     *           Represents a null value.
+     *     @type float $number_value
+     *           Represents a double value.
+     *     @type string $string_value
+     *           Represents a string value.
+     *     @type bool $bool_value
+     *           Represents a boolean value.
+     *     @type \Google\Protobuf\Struct $struct_value
+     *           Represents a structured value.
+     *     @type \Google\Protobuf\ListValue $list_value
+     *           Represents a repeated `Value`.
+     * }
+     */
+    public function __construct($data = NULL) {
+        \GPBMetadata\Google\Protobuf\Struct::initOnce();
+        parent::__construct($data);
+    }
+
+    /**
+     * Represents a null value.
+     *
+     * Generated from protobuf field <code>.google.protobuf.NullValue null_value = 1;</code>
+     * @return int
+     */
+    public function getNullValue()
+    {
+        return $this->readOneof(1);
+    }
+
+    /**
+     * Represents a null value.
+     *
+     * Generated from protobuf field <code>.google.protobuf.NullValue null_value = 1;</code>
+     * @param int $var
+     * @return $this
+     */
+    public function setNullValue($var)
+    {
+        GPBUtil::checkEnum($var, \Google\Protobuf\NullValue::class);
+        $this->writeOneof(1, $var);
+
+        return $this;
+    }
+
+    /**
+     * Represents a double value.
+     *
+     * Generated from protobuf field <code>double number_value = 2;</code>
+     * @return float
+     */
+    public function getNumberValue()
+    {
+        return $this->readOneof(2);
+    }
+
+    /**
+     * Represents a double value.
+     *
+     * Generated from protobuf field <code>double number_value = 2;</code>
+     * @param float $var
+     * @return $this
+     */
+    public function setNumberValue($var)
+    {
+        GPBUtil::checkDouble($var);
+        $this->writeOneof(2, $var);
+
+        return $this;
+    }
+
+    /**
+     * Represents a string value.
+     *
+     * Generated from protobuf field <code>string string_value = 3;</code>
+     * @return string
+     */
+    public function getStringValue()
+    {
+        return $this->readOneof(3);
+    }
+
+    /**
+     * Represents a string value.
+     *
+     * Generated from protobuf field <code>string string_value = 3;</code>
+     * @param string $var
+     * @return $this
+     */
+    public function setStringValue($var)
+    {
+        GPBUtil::checkString($var, True);
+        $this->writeOneof(3, $var);
+
+        return $this;
+    }
+
+    /**
+     * Represents a boolean value.
+     *
+     * Generated from protobuf field <code>bool bool_value = 4;</code>
+     * @return bool
+     */
+    public function getBoolValue()
+    {
+        return $this->readOneof(4);
+    }
+
+    /**
+     * Represents a boolean value.
+     *
+     * Generated from protobuf field <code>bool bool_value = 4;</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setBoolValue($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->writeOneof(4, $var);
+
+        return $this;
+    }
+
+    /**
+     * Represents a structured value.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Struct struct_value = 5;</code>
+     * @return \Google\Protobuf\Struct
+     */
+    public function getStructValue()
+    {
+        return $this->readOneof(5);
+    }
+
+    /**
+     * Represents a structured value.
+     *
+     * Generated from protobuf field <code>.google.protobuf.Struct struct_value = 5;</code>
+     * @param \Google\Protobuf\Struct $var
+     * @return $this
+     */
+    public function setStructValue($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\Struct::class);
+        $this->writeOneof(5, $var);
+
+        return $this;
+    }
+
+    /**
+     * Represents a repeated `Value`.
+     *
+     * Generated from protobuf field <code>.google.protobuf.ListValue list_value = 6;</code>
+     * @return \Google\Protobuf\ListValue
+     */
+    public function getListValue()
+    {
+        return $this->readOneof(6);
+    }
+
+    /**
+     * Represents a repeated `Value`.
+     *
+     * Generated from protobuf field <code>.google.protobuf.ListValue list_value = 6;</code>
+     * @param \Google\Protobuf\ListValue $var
+     * @return $this
+     */
+    public function setListValue($var)
+    {
+        GPBUtil::checkMessage($var, \Google\Protobuf\ListValue::class);
+        $this->writeOneof(6, $var);
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getKind()
+    {
+        return $this->whichOneof("kind");
+    }
+
+}
+
diff --git a/php/src/Google/Protobuf/descriptor.php b/php/src/Google/Protobuf/descriptor.php
deleted file mode 100644
index 9e56ef27..00000000
--- a/php/src/Google/Protobuf/descriptor.php
+++ /dev/null
@@ -1,562 +0,0 @@
-<?php
-
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-namespace Google\Protobuf\Internal;
-
-use Google\Protobuf\Internal\GPBType;
-use Google\Protobuf\Internal\MessageOptions;
-
-class FileDescriptor
-{
-
-    private $package;
-    private $message_type = [];
-    private $enum_type = [];
-
-    public function setPackage($package)
-    {
-        $this->package = $package;
-    }
-
-    public function getPackage()
-    {
-        return $this->package;
-    }
-
-    public function getMessageType()
-    {
-        return $this->message_type;
-    }
-
-    public function addMessageType($desc)
-    {
-        $this->message_type[] = $desc;
-    }
-
-    public function getEnumType()
-    {
-        return $this->enum_type;
-    }
-
-    public function addEnumType($desc)
-    {
-        $this->enum_type[]= $desc;
-    }
-
-    public static function buildFromProto($proto)
-    {
-        $file = new FileDescriptor();
-        $file->setPackage($proto->getPackage());
-        foreach ($proto->getMessageType() as $message_proto) {
-            $file->addMessageType(Descriptor::buildFromProto(
-                $message_proto, $file->getPackage(), ""));
-        }
-        foreach ($proto->getEnumType() as $enum_proto) {
-            $file->getEnumType()[] =
-                $file->addEnumType(
-                    EnumDescriptor::buildFromProto(
-                        $enum_proto,
-                        $file->getPackage(),
-                        ""));
-        }
-        return $file;
-    }
-}
-
-class Descriptor
-{
-
-    private $full_name;
-    private $field = [];
-    private $nested_type = [];
-    private $enum_type = [];
-    private $klass;
-    private $options;
-    private $oneof_decl = [];
-
-    public function addOneofDecl($oneof)
-    {
-        $this->oneof_decl[] = $oneof;
-    }
-
-    public function getOneofDecl()
-    {
-        return $this->oneof_decl;
-    }
-
-    public function setFullName($full_name)
-    {
-        $this->full_name = $full_name;
-    }
-
-    public function getFullName()
-    {
-        return $this->full_name;
-    }
-
-    public function addField($field)
-    {
-        $this->field[$field->getNumber()] = $field;
-    }
-
-    public function getField()
-    {
-        return $this->field;
-    }
-
-    public function addNestedType($desc)
-    {
-        $this->nested_type[] = $desc;
-    }
-
-    public function getNestedType()
-    {
-        return $this->nested_type;
-    }
-
-    public function addEnumType($desc)
-    {
-        $this->enum_type[] = $desc;
-    }
-
-    public function getEnumType()
-    {
-        return $this->enum_type;
-    }
-
-    public function getFieldByNumber($number)
-    {
-      if (!isset($this->field[$number])) {
-        return NULL;
-      } else {
-        return $this->field[$number];
-      }
-    }
-
-    public function setClass($klass)
-    {
-        $this->klass = $klass;
-    }
-
-    public function getClass()
-    {
-        return $this->klass;
-    }
-
-    public function setOptions($options)
-    {
-        $this->options = $options;
-    }
-
-    public function getOptions()
-    {
-        return $this->options;
-    }
-
-    public static function buildFromProto($proto, $package, $containing)
-    {
-        $desc = new Descriptor();
-
-        $message_name_without_package  = "";
-        $classname = "";
-        $fullname = "";
-        getFullClassName(
-            $proto,
-            $containing,
-            $package,
-            $message_name_without_package,
-            $classname,
-            $fullname);
-        $desc->setFullName($fullname);
-        $desc->setClass($classname);
-        $desc->setOptions($proto->getOptions());
-
-        foreach ($proto->getField() as $field_proto) {
-            $desc->addField(FieldDescriptor::buildFromProto($field_proto));
-        }
-
-        // Handle nested types.
-        foreach ($proto->getNestedType() as $nested_proto) {
-            $desc->addNestedType(Descriptor::buildFromProto(
-              $nested_proto, $package, $message_name_without_package));
-        }
-
-        // Handle oneof fields.
-        foreach ($proto->getOneofDecl() as $oneof_proto) {
-            $desc->addOneofDecl(
-                OneofDescriptor::buildFromProto($oneof_proto, $desc));
-        }
-
-        return $desc;
-    }
-}
-
-function addPrefixIfSpecial(
-    $name,
-    $package)
-{
-    if ($name === "Empty" && $package === "google.protobuf") {
-        return "GPBEmpty";
-    } else {
-        return $name;
-    }
-}
-
-function getFullClassName(
-    $proto,
-    $containing,
-    $package,
-    &$message_name_without_package,
-    &$classname,
-    &$fullname)
-{
-    // Full name needs to start with '.'.
-    $message_name_without_package =
-        addPrefixIfSpecial($proto->getName(), $package);
-    if ($containing !== "") {
-        $message_name_without_package =
-            $containing . "." . $message_name_without_package;
-    }
-    if ($package === "") {
-        $fullname = "." . $message_name_without_package;
-    } else {
-        $fullname = "." . $package . "." . $message_name_without_package;
-    }
-
-    // Nested message class names are seperated by '_', and package names are
-    // seperated by '\'.
-    $class_name_without_package =
-        implode('_', array_map('ucwords',
-                               explode('.', $message_name_without_package)));
-    if ($package === "") {
-        $classname = $class_name_without_package;
-    } else {
-        $classname =
-            implode('\\', array_map('ucwords', explode('.', $package))).
-            "\\".$class_name_without_package;
-    }
-}
-
-class OneofDescriptor
-{
-
-    private $name;
-    private $fields;
-
-    public function setName($name)
-    {
-        $this->name = $name;
-    }
-
-    public function getName()
-    {
-        return $this->name;
-    }
-
-    public function addField(&$field)
-    {
-        $this->fields[] = $field;
-    }
-
-    public function getFields()
-    {
-        return $this->fields;
-    }
-
-    public static function buildFromProto($oneof_proto)
-    {
-        $oneof = new OneofDescriptor();
-        $oneof->setName($oneof_proto->getName());
-        return $oneof;
-    }
-}
-
-
-class EnumDescriptor
-{
-
-    private $klass;
-    private $full_name;
-    private $value;
-
-    public function setFullName($full_name)
-    {
-        $this->full_name = $full_name;
-    }
-
-    public function getFullName()
-    {
-        return $this->full_name;
-    }
-
-    public function addValue($number, $value)
-    {
-        $this->value[$number] = $value;
-    }
-
-    public function setClass($klass)
-    {
-        $this->klass = $klass;
-    }
-
-    public function getClass()
-    {
-        return $this->klass;
-    }
-
-    public static function buildFromProto($proto, $package, $containing)
-    {
-        $desc = new EnumDescriptor();
-
-        $enum_name_without_package  = "";
-        $classname = "";
-        $fullname = "";
-        getFullClassName(
-            $proto,
-            $containing,
-            $package,
-            $enum_name_without_package,
-            $classname,
-            $fullname);
-        $desc->setFullName($fullname);
-        $desc->setClass($classname);
-
-        return $desc;
-    }
-}
-
-class EnumValueDescriptor
-{
-}
-
-class FieldDescriptor
-{
-
-    private $name;
-    private $setter;
-    private $getter;
-    private $number;
-    private $label;
-    private $type;
-    private $message_type;
-    private $enum_type;
-    private $packed;
-    private $is_map;
-    private $oneof_index = -1;
-
-    public function setOneofIndex($index)
-    {
-        $this->oneof_index = $index;
-    }
-
-    public function getOneofIndex()
-    {
-        return $this->oneof_index;
-    }
-
-    public function setName($name)
-    {
-        $this->name = $name;
-    }
-
-    public function getName()
-    {
-        return $this->name;
-    }
-
-    public function setSetter($setter)
-    {
-        $this->setter = $setter;
-    }
-
-    public function getSetter()
-    {
-        return $this->setter;
-    }
-
-    public function setGetter($getter)
-    {
-        $this->getter = $getter;
-    }
-
-    public function getGetter()
-    {
-        return $this->getter;
-    }
-
-    public function setNumber($number)
-    {
-        $this->number = $number;
-    }
-
-    public function getNumber()
-    {
-        return $this->number;
-    }
-
-    public function setLabel($label)
-    {
-        $this->label = $label;
-    }
-
-    public function getLabel()
-    {
-        return $this->label;
-    }
-
-    public function isRepeated()
-    {
-        return $this->label === GPBLabel::REPEATED;
-    }
-
-    public function setType($type)
-    {
-        $this->type = $type;
-    }
-
-    public function getType()
-    {
-        return $this->type;
-    }
-
-    public function setMessageType($message_type)
-    {
-        $this->message_type = $message_type;
-    }
-
-    public function getMessageType()
-    {
-        return $this->message_type;
-    }
-
-    public function setEnumType($enum_type)
-    {
-        $this->enum_type = $enum_type;
-    }
-
-    public function getEnumType()
-    {
-        return $this->enum_type;
-    }
-
-    public function setPacked($packed)
-    {
-        $this->packed = $packed;
-    }
-
-    public function getPacked()
-    {
-        return $this->packed;
-    }
-
-    public function isPackable()
-    {
-        return $this->isRepeated() && self::isTypePackable($this->type);
-    }
-
-    public function isMap()
-    {
-        return $this->getType() == GPBType::MESSAGE &&
-               !is_null($this->getMessageType()->getOptions()) &&
-               $this->getMessageType()->getOptions()->getMapEntry();
-    }
-
-    private static function isTypePackable($field_type)
-    {
-        return ($field_type !== GPBType::STRING  &&
-            $field_type !== GPBType::GROUP   &&
-            $field_type !== GPBType::MESSAGE &&
-            $field_type !== GPBType::BYTES);
-    }
-
-    public static function getFieldDescriptor(
-        $name,
-        $label,
-        $type,
-        $number,
-        $oneof_index,
-        $packed,
-        $type_name = null)
-    {
-        $field = new FieldDescriptor();
-        $field->setName($name);
-        $camel_name = implode('', array_map('ucwords', explode('_', $name)));
-        $field->setGetter('get' . $camel_name);
-        $field->setSetter('set' . $camel_name);
-        $field->setType($type);
-        $field->setNumber($number);
-        $field->setLabel($label);
-        $field->setPacked($packed);
-        $field->setOneofIndex($oneof_index);
-
-        // At this time, the message/enum type may have not been added to pool.
-        // So we use the type name as place holder and will replace it with the
-        // actual descriptor in cross building.
-        switch ($type) {
-            case GPBType::MESSAGE:
-                $field->setMessageType($type_name);
-                break;
-            case GPBType::ENUM:
-                $field->setEnumType($type_name);
-                break;
-            default:
-                break;
-        }
-
-        return $field;
-    }
-
-    public static function buildFromProto($proto)
-    {
-        $type_name = null;
-        switch ($proto->getType()) {
-            case GPBType::MESSAGE:
-            case GPBType::GROUP:
-            case GPBType::ENUM:
-                $type_name = $proto->getTypeName();
-                break;
-            default:
-                break;
-        }
-
-        $oneof_index = $proto->hasOneofIndex() ? $proto->getOneofIndex() : -1;
-        $packed = false;
-        $options = $proto->getOptions();
-        if ($options !== null) {
-            $packed = $options->getPacked();
-        }
-
-        return FieldDescriptor::getFieldDescriptor(
-            $proto->getName(), $proto->getLabel(), $proto->getType(),
-            $proto->getNumber(), $oneof_index, $packed, $type_name);
-    }
-}
diff --git a/php/tests/array_test.php b/php/tests/array_test.php
index a4cad719..36a649ed 100644
--- a/php/tests/array_test.php
+++ b/php/tests/array_test.php
@@ -5,7 +5,7 @@ require_once('test_util.php');
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\GPBType;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 
 class RepeatedFieldTest extends PHPUnit_Framework_TestCase
 {
@@ -19,23 +19,23 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::INT32);
 
         // Test append.
-        $arr []= MAX_INT32;
+        $arr[] = MAX_INT32;
         $this->assertSame(MAX_INT32, $arr[0]);
-        $arr []= MIN_INT32;
+        $arr[] = MIN_INT32;
         $this->assertSame(MIN_INT32, $arr[1]);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertSame(1, $arr[2]);
-        $arr []= MAX_INT32_FLOAT;
+        $arr[] = MAX_INT32_FLOAT;
         $this->assertSame(MAX_INT32, $arr[3]);
-        $arr []= MAX_INT32_FLOAT;
+        $arr[] = MAX_INT32_FLOAT;
         $this->assertSame(MAX_INT32, $arr[4]);
 
-        $arr []= '2';
+        $arr[] = '2';
         $this->assertSame(2, $arr[5]);
-        $arr []= '3.1';
+        $arr[] = '3.1';
         $this->assertSame(3, $arr[6]);
-        $arr []= MAX_INT32_STRING;
+        $arr[] = MAX_INT32_STRING;
         $this->assertSame(MAX_INT32, $arr[7]);
 
         $this->assertEquals(8, count($arr));
@@ -46,29 +46,29 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= MAX_INT32;
+        $arr[0] = MAX_INT32;
         $this->assertSame(MAX_INT32, $arr[0]);
-        $arr [1]= MIN_INT32;
+        $arr[1] = MIN_INT32;
         $this->assertSame(MIN_INT32, $arr[1]);
 
-        $arr [2]= 1.1;
+        $arr[2] = 1.1;
         $this->assertSame(1, $arr[2]);
-        $arr [3]= MAX_INT32_FLOAT;
+        $arr[3] = MAX_INT32_FLOAT;
         $this->assertSame(MAX_INT32, $arr[3]);
-        $arr [4]= MAX_INT32_FLOAT;
+        $arr[4] = MAX_INT32_FLOAT;
         $this->assertSame(MAX_INT32, $arr[4]);
 
-        $arr [5]= '2';
+        $arr[5] = '2';
         $this->assertSame(2, $arr[5]);
-        $arr [6]= '3.1';
+        $arr[6] = '3.1';
         $this->assertSame(3, $arr[6]);
-        $arr [7]= MAX_INT32_STRING;
+        $arr[7] = MAX_INT32_STRING;
         $this->assertSame(MAX_INT32, $arr[7]);
 
         // Test foreach.
         $arr = new RepeatedField(GPBType::INT32);
         for ($i = 0; $i < 3; $i++) {
-          $arr []= $i;
+          $arr[] = $i;
         }
         $i = 0;
         foreach ($arr as $val) {
@@ -77,44 +77,6 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $this->assertSame(3, $i);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32AppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32AppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test uint32 field.
     #########################################################
@@ -124,31 +86,31 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::UINT32);
 
         // Test append.
-        $arr []= MAX_UINT32;
+        $arr[] = MAX_UINT32;
         $this->assertSame(-1, $arr[0]);
-        $arr []= -1;
+        $arr[] = -1;
         $this->assertSame(-1, $arr[1]);
-        $arr []= MIN_UINT32;
+        $arr[] = MIN_UINT32;
         $this->assertSame(MIN_UINT32, $arr[2]);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertSame(1, $arr[3]);
-        $arr []= MAX_UINT32_FLOAT;
+        $arr[] = MAX_UINT32_FLOAT;
         $this->assertSame(-1, $arr[4]);
-        $arr []= -1.0;
+        $arr[] = -1.0;
         $this->assertSame(-1, $arr[5]);
-        $arr []= MIN_UINT32_FLOAT;
+        $arr[] = MIN_UINT32_FLOAT;
         $this->assertSame(MIN_UINT32, $arr[6]);
 
-        $arr []= '2';
+        $arr[] = '2';
         $this->assertSame(2, $arr[7]);
-        $arr []= '3.1';
+        $arr[] = '3.1';
         $this->assertSame(3, $arr[8]);
-        $arr []= MAX_UINT32_STRING;
+        $arr[] = MAX_UINT32_STRING;
         $this->assertSame(-1, $arr[9]);
-        $arr []= '-1.0';
+        $arr[] = '-1.0';
         $this->assertSame(-1, $arr[10]);
-        $arr []= MIN_UINT32_STRING;
+        $arr[] = MIN_UINT32_STRING;
         $this->assertSame(MIN_UINT32, $arr[11]);
 
         $this->assertEquals(12, count($arr));
@@ -159,72 +121,34 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= MAX_UINT32;
+        $arr[0] = MAX_UINT32;
         $this->assertSame(-1, $arr[0]);
-        $arr [1]= -1;
+        $arr[1] = -1;
         $this->assertSame(-1, $arr[1]);
-        $arr [2]= MIN_UINT32;
+        $arr[2] = MIN_UINT32;
         $this->assertSame(MIN_UINT32, $arr[2]);
 
-        $arr [3]= 1.1;
+        $arr[3] = 1.1;
         $this->assertSame(1, $arr[3]);
-        $arr [4]= MAX_UINT32_FLOAT;
+        $arr[4] = MAX_UINT32_FLOAT;
         $this->assertSame(-1, $arr[4]);
-        $arr [5]= -1.0;
+        $arr[5] = -1.0;
         $this->assertSame(-1, $arr[5]);
-        $arr [6]= MIN_UINT32_FLOAT;
+        $arr[6] = MIN_UINT32_FLOAT;
         $this->assertSame(MIN_UINT32, $arr[6]);
 
-        $arr [7]= '2';
+        $arr[7] = '2';
         $this->assertSame(2, $arr[7]);
-        $arr [8]= '3.1';
+        $arr[8] = '3.1';
         $this->assertSame(3, $arr[8]);
-        $arr [9]= MAX_UINT32_STRING;
+        $arr[9] = MAX_UINT32_STRING;
         $this->assertSame(-1, $arr[9]);
-        $arr [10]= '-1.0';
+        $arr[10] = '-1.0';
         $this->assertSame(-1, $arr[10]);
-        $arr [11]= MIN_UINT32_STRING;
+        $arr[11] = MIN_UINT32_STRING;
         $this->assertSame(MIN_UINT32, $arr[11]);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32AppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT32);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT32);
-        $arr []= 0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32AppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT32);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT32);
-        $arr []= 0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test int64 field.
     #########################################################
@@ -234,13 +158,13 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::INT64);
 
         // Test append.
-        $arr []= MAX_INT64;
-        $arr []= MIN_INT64;
-        $arr []= 1.1;
-        $arr []= '2';
-        $arr []= '3.1';
-        $arr []= MAX_INT64_STRING;
-        $arr []= MIN_INT64_STRING;
+        $arr[] = MAX_INT64;
+        $arr[] = MIN_INT64;
+        $arr[] = 1.1;
+        $arr[] = '2';
+        $arr[] = '3.1';
+        $arr[] = MAX_INT64_STRING;
+        $arr[] = MIN_INT64_STRING;
         if (PHP_INT_SIZE == 4) {
             $this->assertSame(MAX_INT64, $arr[0]);
             $this->assertSame(MIN_INT64, $arr[1]);
@@ -272,13 +196,13 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= MAX_INT64;
-        $arr [1]= MIN_INT64;
-        $arr [2]= 1.1;
-        $arr [3]= '2';
-        $arr [4]= '3.1';
-        $arr [5]= MAX_INT64_STRING;
-        $arr [6]= MIN_INT64_STRING;
+        $arr[0] = MAX_INT64;
+        $arr[1] = MIN_INT64;
+        $arr[2] = 1.1;
+        $arr[3] = '2';
+        $arr[4] = '3.1';
+        $arr[5] = MAX_INT64_STRING;
+        $arr[6] = MIN_INT64_STRING;
 
         if (PHP_INT_SIZE == 4) {
             $this->assertSame(MAX_INT64_STRING, $arr[0]);
@@ -299,44 +223,6 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64AppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::INT64);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::INT64);
-        $arr []= 0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64AppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::INT64);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::INT64);
-        $arr []= 0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test uint64 field.
     #########################################################
@@ -346,11 +232,11 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::UINT64);
 
         // Test append.
-        $arr []= MAX_UINT64;
-        $arr []= 1.1;
-        $arr []= '2';
-        $arr []= '3.1';
-        $arr []= MAX_UINT64_STRING;
+        $arr[] = MAX_UINT64;
+        $arr[] = 1.1;
+        $arr[] = '2';
+        $arr[] = '3.1';
+        $arr[] = MAX_UINT64_STRING;
 
         if (PHP_INT_SIZE == 4) {
             $this->assertSame(MAX_UINT64_STRING, $arr[0]);
@@ -379,11 +265,11 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= MAX_UINT64;
-        $arr [1]= 1.1;
-        $arr [2]= '2';
-        $arr [3]= '3.1';
-        $arr [4]= MAX_UINT64_STRING;
+        $arr[0] = MAX_UINT64;
+        $arr[1] = 1.1;
+        $arr[2] = '2';
+        $arr[3] = '3.1';
+        $arr[4] = MAX_UINT64_STRING;
 
         if (PHP_INT_SIZE == 4) {
             $this->assertSame(MAX_UINT64_STRING, $arr[0]);
@@ -400,44 +286,6 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64AppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT64);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT64);
-        $arr []= 0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64AppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT64);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::UINT64);
-        $arr []= 0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test float field.
     #########################################################
@@ -447,15 +295,15 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::FLOAT);
 
         // Test append.
-        $arr []= 1;
+        $arr[] = 1;
         $this->assertEquals(1.0, $arr[0], '', MAX_FLOAT_DIFF);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertEquals(1.1, $arr[1], '', MAX_FLOAT_DIFF);
 
-        $arr []= '2';
+        $arr[] = '2';
         $this->assertEquals(2.0, $arr[2], '', MAX_FLOAT_DIFF);
-        $arr []= '3.1';
+        $arr[] = '3.1';
         $this->assertEquals(3.1, $arr[3], '', MAX_FLOAT_DIFF);
 
         $this->assertEquals(4, count($arr));
@@ -466,56 +314,18 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= 1;
+        $arr[0] = 1;
         $this->assertEquals(1.0, $arr[0], '', MAX_FLOAT_DIFF);
 
-        $arr [1]= 1.1;
+        $arr[1] = 1.1;
         $this->assertEquals(1.1, $arr[1], '', MAX_FLOAT_DIFF);
 
-        $arr [2]= '2';
+        $arr[2] = '2';
         $this->assertEquals(2.0, $arr[2], '', MAX_FLOAT_DIFF);
-        $arr [3]= '3.1';
+        $arr[3] = '3.1';
         $this->assertEquals(3.1, $arr[3], '', MAX_FLOAT_DIFF);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatAppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::FLOAT);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatSetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::FLOAT);
-        $arr []= 0.0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatAppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::FLOAT);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatSetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::FLOAT);
-        $arr []= 0.0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test double field.
     #########################################################
@@ -525,15 +335,15 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::DOUBLE);
 
         // Test append.
-        $arr []= 1;
+        $arr[] = 1;
         $this->assertEquals(1.0, $arr[0], '', MAX_FLOAT_DIFF);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertEquals(1.1, $arr[1], '', MAX_FLOAT_DIFF);
 
-        $arr []= '2';
+        $arr[] = '2';
         $this->assertEquals(2.0, $arr[2], '', MAX_FLOAT_DIFF);
-        $arr []= '3.1';
+        $arr[] = '3.1';
         $this->assertEquals(3.1, $arr[3], '', MAX_FLOAT_DIFF);
 
         $this->assertEquals(4, count($arr));
@@ -544,56 +354,18 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= 1;
+        $arr[0] = 1;
         $this->assertEquals(1.0, $arr[0], '', MAX_FLOAT_DIFF);
 
-        $arr [1]= 1.1;
+        $arr[1] = 1.1;
         $this->assertEquals(1.1, $arr[1], '', MAX_FLOAT_DIFF);
 
-        $arr [2]= '2';
+        $arr[2] = '2';
         $this->assertEquals(2.0, $arr[2], '', MAX_FLOAT_DIFF);
-        $arr [3]= '3.1';
+        $arr[3] = '3.1';
         $this->assertEquals(3.1, $arr[3], '', MAX_FLOAT_DIFF);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleAppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::DOUBLE);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleSetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::DOUBLE);
-        $arr []= 0.0;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleAppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::DOUBLE);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleSetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::DOUBLE);
-        $arr []= 0.0;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test bool field.
     #########################################################
@@ -603,16 +375,16 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::BOOL);
 
         // Test append.
-        $arr []= true;
+        $arr[] = true;
         $this->assertSame(true, $arr[0]);
 
-        $arr []= -1;
+        $arr[] = -1;
         $this->assertSame(true, $arr[1]);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertSame(true, $arr[2]);
 
-        $arr []= '';
+        $arr[] = '';
         $this->assertSame(false, $arr[3]);
 
         $this->assertEquals(4, count($arr));
@@ -623,38 +395,19 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= true;
+        $arr[0] = true;
         $this->assertSame(true, $arr[0]);
 
-        $arr [1]= -1;
+        $arr[1] = -1;
         $this->assertSame(true, $arr[1]);
 
-        $arr [2]= 1.1;
+        $arr[2] = 1.1;
         $this->assertSame(true, $arr[2]);
 
-        $arr [3]= '';
+        $arr[3] = '';
         $this->assertSame(false, $arr[3]);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testBoolAppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::BOOL);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testBoolSetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::BOOL);
-        $arr []= true;
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test string field.
     #########################################################
@@ -664,16 +417,16 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $arr = new RepeatedField(GPBType::STRING);
 
         // Test append.
-        $arr []= 'abc';
+        $arr[] = 'abc';
         $this->assertSame('abc', $arr[0]);
 
-        $arr []= 1;
+        $arr[] = 1;
         $this->assertSame('1', $arr[1]);
 
-        $arr []= 1.1;
+        $arr[] = 1.1;
         $this->assertSame('1.1', $arr[2]);
 
-        $arr []= true;
+        $arr[] = true;
         $this->assertSame('1', $arr[3]);
 
         $this->assertEquals(4, count($arr));
@@ -684,137 +437,52 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         }
 
         // Test set.
-        $arr [0]= 'abc';
+        $arr[0] = 'abc';
         $this->assertSame('abc', $arr[0]);
 
-        $arr [1]= 1;
+        $arr[1] = 1;
         $this->assertSame('1', $arr[1]);
 
-        $arr [2]= 1.1;
+        $arr[2] = 1.1;
         $this->assertSame('1.1', $arr[2]);
 
-        $arr [3]= true;
+        $arr[3] = true;
         $this->assertSame('1', $arr[3]);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringAppendMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::STRING);
-        $arr []= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::STRING);
-        $arr []= 'abc';
-        $arr [0]= new TestMessage_Sub();
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringAppendInvalidUTF8Fail()
-    {
-        $arr = new RepeatedField(GPBType::STRING);
-        $hex = hex2bin("ff");
-        $arr []= $hex;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetInvalidUTF8Fail()
-    {
-        $arr = new RepeatedField(GPBType::STRING);
-        $arr []= 'abc';
-        $hex = hex2bin("ff");
-        $arr [0]= $hex;
-    }
-
     #########################################################
     # Test message field.
     #########################################################
 
     public function testMessage()
     {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
 
         // Test append.
-        $sub_m = new TestMessage_Sub();
+        $sub_m = new Sub();
         $sub_m->setA(1);
-        $arr []= $sub_m;
+        $arr[] = $sub_m;
         $this->assertSame(1, $arr[0]->getA());
 
-        $null = null;
-        $arr []= $null;
-        $this->assertNull($arr[1]);
-
-        $this->assertEquals(2, count($arr));
-
-        for ($i = 0; $i < count($arr); $i++) {
-            $arr[$i] = $null;
-            $this->assertNull($arr[$i]);
-        }
+        $this->assertEquals(1, count($arr));
 
         // Test set.
-        $arr [0]= $sub_m;
-        $this->assertSame(1, $arr[0]->getA());
-
-        $arr [1]= $null;
-        $this->assertNull($arr[1]);
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageAppendIntFail()
-    {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
-        $arr []= 1;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageSetIntFail()
-    {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
-        $arr []= new TestMessage_Sub;
-        $arr [0]= 'abc';
-    }
+        $sub_m = new Sub();
+        $sub_m->setA(2);
+        $arr[0] = $sub_m;
+        $this->assertSame(2, $arr[0]->getA());
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageAppendStringFail()
-    {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
-        $arr []= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageSetStringFail()
-    {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
-        $arr []= new TestMessage_Sub;
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageAppendOtherMessageFail()
-    {
-        $arr = new RepeatedField(GPBType::MESSAGE, TestMessage_Sub::class);
-        $arr []= new TestMessage;
+        // Test foreach.
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        for ($i = 0; $i < 3; $i++) {
+          $arr[] = new Sub();
+          $arr[$i]->setA($i);
+        }
+        $i = 0;
+        foreach ($arr as $val) {
+          $this->assertSame($i++, $val->getA());
+        }
+        $this->assertSame(3, $i);
     }
 
     #########################################################
@@ -824,18 +492,18 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
     public function testOffset()
     {
         $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 0;
+        $arr[] = 0;
 
-        $arr [0]= 1;
+        $arr[0] = 1;
         $this->assertSame(1, $arr[0]);
         $this->assertSame(1, count($arr));
 
-        $arr ['0']= 2;
+        $arr['0'] = 2;
         $this->assertSame(2, $arr['0']);
         $this->assertSame(2, $arr[0]);
         $this->assertSame(1, count($arr));
 
-        $arr [0.0]= 3;
+        $arr[0.0] = 3;
         $this->assertSame(3, $arr[0.0]);
         $this->assertSame(1, count($arr));
     }
@@ -844,9 +512,9 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
     {
         $arr = new RepeatedField(GPBType::INT32);
 
-        $arr []= 0;
-        $arr []= 1;
-        $arr []= 2;
+        $arr[] = 0;
+        $arr[] = 1;
+        $arr[] = 2;
         $this->assertSame(3, count($arr));
 
         unset($arr[2]);
@@ -854,75 +522,22 @@ class RepeatedFieldTest extends PHPUnit_Framework_TestCase
         $this->assertSame(0, $arr[0]);
         $this->assertSame(1, $arr[1]);
 
-        $arr [] = 3;
+        $arr[] = 3;
         $this->assertSame(3, count($arr));
         $this->assertSame(0, $arr[0]);
         $this->assertSame(1, $arr[1]);
         $this->assertSame(3, $arr[2]);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRemoveMiddleFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-
-        $arr []= 0;
-        $arr []= 1;
-        $arr []= 2;
-        $this->assertSame(3, count($arr));
-
-        unset($arr[1]);
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRemoveEmptyFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-
-        unset($arr[0]);
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageOffsetFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 0;
-        $arr [new TestMessage_Sub()]= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringOffsetFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr []= 0;
-        $arr ['abc']= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testSetNonExistedOffsetFail()
-    {
-        $arr = new RepeatedField(GPBType::INT32);
-        $arr [0]= 0;
-    }
-
     #########################################################
     # Test memory leak
     #########################################################
 
     public function testCycleLeak()
     {
+        gc_collect_cycles();
         $arr = new RepeatedField(GPBType::MESSAGE, TestMessage::class);
-        $arr []= new TestMessage;
+        $arr[] = new TestMessage;
         $arr[0]->SetRepeatedRecursive($arr);
 
         // Clean up memory before test.
diff --git a/php/tests/autoload.php b/php/tests/autoload.php
index 0a917fc5..b98b13ab 100755
--- a/php/tests/autoload.php
+++ b/php/tests/autoload.php
@@ -1,5 +1,7 @@
 <?php
 
+error_reporting(E_ALL);
+
 function getGeneratedFiles($dir, &$results = array())
 {
     $files = scandir($dir);
diff --git a/php/tests/bootstrap_phpunit.php b/php/tests/bootstrap_phpunit.php
new file mode 100644
index 00000000..8452f158
--- /dev/null
+++ b/php/tests/bootstrap_phpunit.php
@@ -0,0 +1,5 @@
+<?php
+
+require_once("vendor/autoload.php");
+
+error_reporting(E_ALL);
diff --git a/php/tests/compatibility_test.sh b/php/tests/compatibility_test.sh
new file mode 100755
index 00000000..7caa46e7
--- /dev/null
+++ b/php/tests/compatibility_test.sh
@@ -0,0 +1,140 @@
+#!/bin/bash
+
+function use_php() {
+  VERSION=$1
+  PHP=`which php`
+  PHP_CONFIG=`which php-config`
+  PHPIZE=`which phpize`
+  ln -sfn "/usr/local/php-${VERSION}/bin/php" $PHP
+  ln -sfn "/usr/local/php-${VERSION}/bin/php-config" $PHP_CONFIG
+  ln -sfn "/usr/local/php-${VERSION}/bin/phpize" $PHPIZE
+}
+
+function generate_proto() {
+  PROTOC1=$1
+  PROTOC2=$2
+
+  rm -rf generated
+  mkdir generated
+
+  $PROTOC1 --php_out=generated proto/test_include.proto
+  $PROTOC2 --php_out=generated proto/test.proto proto/test_no_namespace.proto proto/test_prefix.proto
+  pushd ../../src
+  $PROTOC2 --php_out=../php/tests/generated -I../php/tests -I. ../php/tests/proto/test_import_descriptor_proto.proto
+  popd
+}
+
+# Remove tests to expect error. These were added to API tests by mistake.
+function remove_error_test() {
+  local TEMPFILE=`tempfile`
+  cat $1 | \
+  awk -v file=`basename $1` -v dir=`basename $(dirname $1)` '
+    BEGIN {
+      show = 1
+    }
+    /@expectedException PHPUnit_Framework_Error/ { show = 0; next; }
+    / *\*\//                                     { print; next; }
+    / *}/ {
+      if (!show) {
+        show = 1;
+        next;
+      }
+    }
+    show { print }
+  ' > $TEMPFILE
+  cp $TEMPFILE $1
+}
+
+set -ex
+
+# Change to the script's directory.
+cd $(dirname $0)
+
+# The old version of protobuf that we are testing compatibility against.
+case "$1" in
+  ""|3.3.0)
+    OLD_VERSION=3.3.0
+    OLD_VERSION_PROTOC=http://repo1.maven.org/maven2/com/google/protobuf/protoc/3.3.0/protoc-3.3.0-linux-x86_64.exe
+    ;;
+  *)
+    echo "[ERROR]: Unknown version number: $1"
+    exit 1
+    ;;
+esac
+
+# Extract the latest protobuf version number.
+VERSION_NUMBER=`grep "PHP_PROTOBUF_VERSION" ../ext/google/protobuf/protobuf.h | sed "s|#define PHP_PROTOBUF_VERSION \"\(.*\)\"|\1|"`
+
+echo "Running compatibility tests between $VERSION_NUMBER and $OLD_VERSION"
+
+# Check protoc
+[ -f ../../src/protoc ] || {
+  echo "[ERROR]: Please build protoc first."
+  exit 1
+}
+
+# Download old test.
+rm -rf protobuf
+git clone https://github.com/google/protobuf.git
+pushd protobuf
+git checkout v$OLD_VERSION
+popd
+
+# Build and copy the new runtime
+use_php 5.5
+pushd ../ext/google/protobuf
+make clean || true
+phpize && ./configure && make
+popd
+
+rm -rf protobuf/php/ext
+rm -rf protobuf/php/src
+cp -r ../ext protobuf/php/ext/
+cp -r ../src protobuf/php/src/
+
+# Download old version protoc compiler (for linux)
+wget $OLD_VERSION_PROTOC -O old_protoc
+chmod +x old_protoc
+
+NEW_PROTOC=`pwd`/../../src/protoc
+OLD_PROTOC=`pwd`/old_protoc
+cd protobuf/php
+cp -r /usr/local/vendor-5.5 vendor
+wget https://phar.phpunit.de/phpunit-4.8.0.phar -O /usr/bin/phpunit
+
+# Remove implementation detail tests.
+tests=( array_test.php encode_decode_test.php generated_class_test.php map_field_test.php well_known_test.php )
+sed -i.bak '/php_implementation_test.php/d' phpunit.xml
+for t in "${tests[@]}"
+do
+  remove_error_test tests/$t
+done
+
+cd tests
+
+# Test A.1:
+#   proto set 1: use old version
+#   proto set 2 which may import protos in set 1: use old version
+generate_proto $OLD_PROTOC $OLD_PROTOC
+./test.sh
+pushd ..
+phpunit
+popd
+
+# Test A.2:
+#   proto set 1: use new version
+#   proto set 2 which may import protos in set 1: use old version
+generate_proto $NEW_PROTOC $OLD_PROTOC
+./test.sh
+pushd ..
+phpunit
+popd
+
+# Test A.3:
+#   proto set 1: use old version
+#   proto set 2 which may import protos in set 1: use new version
+generate_proto $OLD_PROTOC $NEW_PROTOC
+./test.sh
+pushd ..
+phpunit
+popd
diff --git a/php/tests/descriptors_test.php b/php/tests/descriptors_test.php
new file mode 100644
index 00000000..93683b82
--- /dev/null
+++ b/php/tests/descriptors_test.php
@@ -0,0 +1,246 @@
+<?php
+
+require_once('generated/Descriptors/TestDescriptorsEnum.php');
+require_once('generated/Descriptors/TestDescriptorsMessage.php');
+require_once('test_base.php');
+require_once('test_util.php');
+
+use Google\Protobuf\DescriptorPool;
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\MapField;
+use Descriptors\TestDescriptorsEnum;
+use Descriptors\TestDescriptorsMessage;
+use Descriptors\TestDescriptorsMessage\Sub;
+
+class DescriptorsTest extends TestBase
+{
+
+    // Redefine these here for compatibility with c extension
+    const GPBLABEL_OPTIONAL = 1;
+    const GPBLABEL_REQUIRED = 2;
+    const GPBLABEL_REPEATED = 3;
+
+    const GPBTYPE_DOUBLE   =  1;
+    const GPBTYPE_FLOAT    =  2;
+    const GPBTYPE_INT64    =  3;
+    const GPBTYPE_UINT64   =  4;
+    const GPBTYPE_INT32    =  5;
+    const GPBTYPE_FIXED64  =  6;
+    const GPBTYPE_FIXED32  =  7;
+    const GPBTYPE_BOOL     =  8;
+    const GPBTYPE_STRING   =  9;
+    const GPBTYPE_GROUP    = 10;
+    const GPBTYPE_MESSAGE  = 11;
+    const GPBTYPE_BYTES    = 12;
+    const GPBTYPE_UINT32   = 13;
+    const GPBTYPE_ENUM     = 14;
+    const GPBTYPE_SFIXED32 = 15;
+    const GPBTYPE_SFIXED64 = 16;
+    const GPBTYPE_SINT32   = 17;
+    const GPBTYPE_SINT64   = 18;
+
+    #########################################################
+    # Test descriptor pool.
+    #########################################################
+
+    public function testDescriptorPool()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+        $this->assertInstanceOf('\Google\Protobuf\Descriptor', $desc);
+
+        $enumDesc = $pool->getEnumDescriptorByClassName(get_class(new TestDescriptorsEnum()));
+        $this->assertInstanceOf('\Google\Protobuf\EnumDescriptor', $enumDesc);
+    }
+
+    public function testDescriptorPoolIncorrectArgs()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+
+        $desc = $pool->getDescriptorByClassName('NotAClass');
+        $this->assertNull($desc);
+
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsEnum()));
+        $this->assertNull($desc);
+
+        $enumDesc = $pool->getEnumDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+        $this->assertNull($enumDesc);
+    }
+
+    #########################################################
+    # Test descriptor.
+    #########################################################
+
+    public function testDescriptor()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+        $class = get_class(new TestDescriptorsMessage());
+        $this->assertSame('Descriptors\TestDescriptorsMessage', $class);
+        $desc = $pool->getDescriptorByClassName($class);
+
+        $this->assertSame('descriptors.TestDescriptorsMessage', $desc->getFullName());
+        $this->assertSame($class, $desc->getClass());
+
+        $this->assertInstanceOf('\Google\Protobuf\FieldDescriptor', $desc->getField(0));
+        $this->assertSame(7, $desc->getFieldCount());
+
+        $this->assertInstanceOf('\Google\Protobuf\OneofDescriptor', $desc->getOneofDecl(0));
+        $this->assertSame(1, $desc->getOneofDeclCount());
+    }
+
+    #########################################################
+    # Test enum descriptor.
+    #########################################################
+
+    public function testEnumDescriptor()
+    {
+        // WARNINIG - we need to do this so that TestDescriptorsEnum is registered!!?
+        new TestDescriptorsMessage();
+
+        $pool = DescriptorPool::getGeneratedPool();
+
+        $enumDesc = $pool->getEnumDescriptorByClassName(get_class(new TestDescriptorsEnum()));
+
+        // Build map of enum values
+        $enumDescMap = [];
+        for ($i = 0; $i < $enumDesc->getValueCount(); $i++) {
+            $enumValueDesc = $enumDesc->getValue($i);
+            $this->assertInstanceOf('\Google\Protobuf\EnumValueDescriptor', $enumValueDesc);
+            $enumDescMap[$enumValueDesc->getNumber()] = $enumValueDesc->getName();
+        }
+
+        $this->assertSame('ZERO', $enumDescMap[0]);
+        $this->assertSame('ONE', $enumDescMap[1]);
+
+        $this->assertSame(2, $enumDesc->getValueCount());
+    }
+
+    #########################################################
+    # Test field descriptor.
+    #########################################################
+
+    public function testFieldDescriptor()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+
+        $fieldDescMap = $this->buildFieldMap($desc);
+
+        // Optional int field
+        $fieldDesc = $fieldDescMap[1];
+        $this->assertSame('optional_int32', $fieldDesc->getName());
+        $this->assertSame(1, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_OPTIONAL, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_INT32, $fieldDesc->getType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Optional enum field
+        $fieldDesc = $fieldDescMap[16];
+        $this->assertSame('optional_enum', $fieldDesc->getName());
+        $this->assertSame(16, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_OPTIONAL, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_ENUM, $fieldDesc->getType());
+        $this->assertInstanceOf('\Google\Protobuf\EnumDescriptor', $fieldDesc->getEnumType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Optional message field
+        $fieldDesc = $fieldDescMap[17];
+        $this->assertSame('optional_message', $fieldDesc->getName());
+        $this->assertSame(17, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_OPTIONAL, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_MESSAGE, $fieldDesc->getType());
+        $this->assertInstanceOf('\Google\Protobuf\Descriptor', $fieldDesc->getMessageType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Repeated int field
+        $fieldDesc = $fieldDescMap[31];
+        $this->assertSame('repeated_int32', $fieldDesc->getName());
+        $this->assertSame(31, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_REPEATED, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_INT32, $fieldDesc->getType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Repeated message field
+        $fieldDesc = $fieldDescMap[47];
+        $this->assertSame('repeated_message', $fieldDesc->getName());
+        $this->assertSame(47, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_REPEATED, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_MESSAGE, $fieldDesc->getType());
+        $this->assertInstanceOf('\Google\Protobuf\Descriptor', $fieldDesc->getMessageType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Oneof int field
+        // Tested further in testOneofDescriptor()
+        $fieldDesc = $fieldDescMap[51];
+        $this->assertSame('oneof_int32', $fieldDesc->getName());
+        $this->assertSame(51, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_OPTIONAL, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_INT32, $fieldDesc->getType());
+        $this->assertFalse($fieldDesc->isMap());
+
+        // Map int-enum field
+        $fieldDesc = $fieldDescMap[71];
+        $this->assertSame('map_int32_enum', $fieldDesc->getName());
+        $this->assertSame(71, $fieldDesc->getNumber());
+        $this->assertSame(self::GPBLABEL_REPEATED, $fieldDesc->getLabel());
+        $this->assertSame(self::GPBTYPE_MESSAGE, $fieldDesc->getType());
+        $this->assertTrue($fieldDesc->isMap());
+        $mapDesc = $fieldDesc->getMessageType();
+        $this->assertSame('descriptors.TestDescriptorsMessage.MapInt32EnumEntry', $mapDesc->getFullName());
+        $this->assertSame(self::GPBTYPE_INT32, $mapDesc->getField(0)->getType());
+        $this->assertSame(self::GPBTYPE_ENUM, $mapDesc->getField(1)->getType());
+    }
+
+    /**
+     * @expectedException \Exception
+     */
+    public function testFieldDescriptorEnumException()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+        $fieldDesc = $desc->getField(0);
+        $fieldDesc->getEnumType();
+    }
+
+    /**
+     * @expectedException \Exception
+     */
+    public function testFieldDescriptorMessageException()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+        $fieldDesc = $desc->getField(0);
+        $fieldDesc->getMessageType();
+    }
+
+    #########################################################
+    # Test oneof descriptor.
+    #########################################################
+
+    public function testOneofDescriptor()
+    {
+        $pool = DescriptorPool::getGeneratedPool();
+        $desc = $pool->getDescriptorByClassName(get_class(new TestDescriptorsMessage()));
+
+        $fieldDescMap = $this->buildFieldMap($desc);
+        $fieldDesc = $fieldDescMap[51];
+
+        $oneofDesc = $desc->getOneofDecl(0);
+
+        $this->assertSame('my_oneof', $oneofDesc->getName());
+        $fieldDescFromOneof = $oneofDesc->getField(0);
+        $this->assertSame($fieldDesc, $fieldDescFromOneof);
+        $this->assertSame(1, $oneofDesc->getFieldCount());
+    }
+
+    private function buildFieldMap($desc)
+    {
+        $fieldDescMap = [];
+        for ($i = 0; $i < $desc->getFieldCount(); $i++) {
+            $fieldDesc = $desc->getField($i);
+            $fieldDescMap[$fieldDesc->getNumber()] = $fieldDesc;
+        }
+        return $fieldDescMap;
+    }
+}
diff --git a/php/tests/encode_decode_test.php b/php/tests/encode_decode_test.php
index b54b1239..d36b883e 100644
--- a/php/tests/encode_decode_test.php
+++ b/php/tests/encode_decode_test.php
@@ -7,8 +7,9 @@ use Google\Protobuf\RepeatedField;
 use Google\Protobuf\GPBType;
 use Foo\TestEnum;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 use Foo\TestPackedMessage;
+use Foo\TestRandomFieldOrder;
 use Foo\TestUnpackedMessage;
 
 class EncodeDecodeTest extends TestBase
@@ -81,13 +82,37 @@ class EncodeDecodeTest extends TestBase
         $n->mergeFromString($data);
         $this->assertSame('abc', $n->getOneofString());
 
-        $sub_m = new TestMessage_Sub();
+        $sub_m = new Sub();
         $sub_m->setA(1);
         $m->setOneofMessage($sub_m);
         $data = $m->serializeToString();
         $n = new TestMessage();
         $n->mergeFromString($data);
         $this->assertSame(1, $n->getOneofMessage()->getA());
+
+        // Encode default value
+        $m->setOneofEnum(TestEnum::ZERO);
+        $data = $m->serializeToString();
+        $n = new TestMessage();
+        $n->mergeFromString($data);
+        $this->assertSame("oneof_enum", $n->getMyOneof());
+        $this->assertSame(TestEnum::ZERO, $n->getOneofEnum());
+
+        $m->setOneofString("");
+        $data = $m->serializeToString();
+        $n = new TestMessage();
+        $n->mergeFromString($data);
+        $this->assertSame("oneof_string", $n->getMyOneof());
+        $this->assertSame("", $n->getOneofString());
+
+        $sub_m = new Sub();
+        $m->setOneofMessage($sub_m);
+        $data = $m->serializeToString();
+        $n = new TestMessage();
+        $n->mergeFromString($data);
+        $this->assertSame("oneof_message", $n->getMyOneof());
+        $this->assertFalse(is_null($n->getOneofMessage()));
+
     }
 
     public function testPackedEncode()
@@ -190,15 +215,311 @@ class EncodeDecodeTest extends TestBase
         $m->mergeFromString($data);
     }
 
-    # TODO(teboring): Add test back when php implementation is ready for json
-    # encode/decode.
-    # public function testJsonEncode()
-    # {
-    #     $from = new TestMessage();
-    #     $this->setFields($from);
-    #     $data = $from->jsonEncode();
-    #     $to = new TestMessage();
-    #     $to->jsonDecode($data);
-    #     $this->expectFields($to);
-    # }
+    public function testEncodeNegativeInt32()
+    {
+        $m = new TestMessage();
+        $m->setOptionalInt32(-1);
+        $data = $m->serializeToString();
+        $this->assertSame("08ffffffffffffffffff01", bin2hex($data));
+    }
+
+    public function testDecodeNegativeInt32()
+    {
+        $m = new TestMessage();
+        $this->assertEquals(0, $m->getOptionalInt32());
+        $m->mergeFromString(hex2bin("08ffffffffffffffffff01"));
+        $this->assertEquals(-1, $m->getOptionalInt32());
+
+        $m = new TestMessage();
+        $this->assertEquals(0, $m->getOptionalInt32());
+        $m->mergeFromString(hex2bin("08ffffffff0f"));
+        $this->assertEquals(-1, $m->getOptionalInt32());
+    }
+
+    public function testRandomFieldOrder()
+    {
+        $m = new TestRandomFieldOrder();
+        $data = $m->serializeToString();
+        $this->assertSame("", $data);
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidInt32()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('08'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidSubMessage()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('9A010108'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidInt64()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('10'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidUInt32()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('18'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidUInt64()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('20'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidSInt32()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('28'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidSInt64()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('30'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidFixed32()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('3D'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidFixed64()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('41'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidSFixed32()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('4D'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidSFixed64()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('51'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidFloat()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('5D'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidDouble()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('61'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidBool()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('68'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidStringLengthMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('72'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidStringDataMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('7201'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidBytesLengthMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('7A'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidBytesDataMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('7A01'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidEnum()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('8001'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidMessageLengthMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('8A01'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidMessageDataMiss()
+    {
+        $m = new TestMessage();
+        $m->mergeFromString(hex2bin('8A0101'));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testDecodeInvalidPackedMessageLength()
+    {
+        $m = new TestPackedMessage();
+        $m->mergeFromString(hex2bin('D205'));
+    }
+
+    public function testUnknown()
+    {
+        // Test preserve unknown for varint.
+        $m = new TestMessage();
+        $from = hex2bin('F80601');  // TODO(teboring): Add a util to encode
+                                    // varint for better readability
+        $m->mergeFromString($from);
+        $to = $m->serializeToString();
+        $this->assertSame(bin2hex($from), bin2hex($to));
+
+        // Test preserve unknown for 64-bit.
+        $m = new TestMessage();
+        $from = hex2bin('F9060000000000000000');
+        $m->mergeFromString($from);
+        $to = $m->serializeToString();
+        $this->assertSame(bin2hex($from), bin2hex($to));
+
+        // Test preserve unknown for length delimited.
+        $m = new TestMessage();
+        $from = hex2bin('FA0600');
+        $m->mergeFromString($from);
+        $to = $m->serializeToString();
+        $this->assertSame(bin2hex($from), bin2hex($to));
+
+        // Test preserve unknown for 32-bit.
+        $m = new TestMessage();
+        $from = hex2bin('FD0600000000');
+        $m->mergeFromString($from);
+        $to = $m->serializeToString();
+        $this->assertSame(bin2hex($from), bin2hex($to));
+
+        // Test discard unknown in message.
+        $m = new TestMessage();
+        $from = hex2bin('F80601');
+        $m->mergeFromString($from);
+        $m->discardUnknownFields();
+        $to = $m->serializeToString();
+        $this->assertSame("", bin2hex($to));
+
+        // Test discard unknown for singular message field.
+        $m = new TestMessage();
+        $from = hex2bin('8A0103F80601');
+        $m->mergeFromString($from);
+        $m->discardUnknownFields();
+        $to = $m->serializeToString();
+        $this->assertSame("8a0100", bin2hex($to));
+
+        // Test discard unknown for repeated message field.
+        $m = new TestMessage();
+        $from = hex2bin('FA0203F80601');
+        $m->mergeFromString($from);
+        $m->discardUnknownFields();
+        $to = $m->serializeToString();
+        $this->assertSame("fa0200", bin2hex($to));
+
+        // Test discard unknown for map message value field.
+        $m = new TestMessage();
+        $from = hex2bin("BA050708011203F80601");
+        $m->mergeFromString($from);
+        $m->discardUnknownFields();
+        $to = $m->serializeToString();
+        $this->assertSame("ba050408011200", bin2hex($to));
+
+        // Test discard unknown for singular message field.
+        $m = new TestMessage();
+        $from = hex2bin('9A0403F80601');
+        $m->mergeFromString($from);
+        $m->discardUnknownFields();
+        $to = $m->serializeToString();
+        $this->assertSame("9a0400", bin2hex($to));
+    }
+
+    public function testJsonEncode()
+    {
+        $from = new TestMessage();
+        $this->setFields($from);
+        $data = $from->serializeToJsonString();
+        $to = new TestMessage();
+        $to->mergeFromJsonString($data);
+        $this->expectFields($to);
+    }
 }
diff --git a/php/tests/gdb_test.sh b/php/tests/gdb_test.sh
index 3c0d97a2..36fa31bb 100755
--- a/php/tests/gdb_test.sh
+++ b/php/tests/gdb_test.sh
@@ -1,12 +1,18 @@
 #!/bin/bash
 
+VERSION=$1
+
+export PATH=/usr/local/php-$VERSION/bin:$PATH
+export C_INCLUDE_PATH=/usr/local/php-$VERSION/include/php/main:/usr/local/php-$VERSION/include/php:$C_INCLUDE_PATH
+export CPLUS_INCLUDE_PATH=/usr/local/php-$VERSION/include/php/main:/usr/local/php-$VERSION/include/php:$CPLUS_INCLUDE_PATH
+
+php -i | grep "Configuration"
+
 # gdb --args php -dextension=../ext/google/protobuf/modules/protobuf.so `which
 # phpunit` --bootstrap autoload.php tmp_test.php
 #
-gdb --args php -dextension=../ext/google/protobuf/modules/protobuf.so `which phpunit` --bootstrap autoload.php encode_decode_test.php
+gdb --args php -dextension=../ext/google/protobuf/modules/protobuf.so `which phpunit` --bootstrap autoload.php generated_class_test.php
 #
-# # gdb --args php -dextension=../ext/google/protobuf/modules/protobuf.so
-# memory_leak_test.php
+# gdb --args php -dextension=../ext/google/protobuf/modules/protobuf.so memory_leak_test.php
 #
-# # USE_ZEND_ALLOC=0 valgrind --leak-check=yes php
-# -dextension=../ext/google/protobuf/modules/protobuf.so memory_leak_test.php
+# USE_ZEND_ALLOC=0 valgrind --leak-check=yes php -dextension=../ext/google/protobuf/modules/protobuf.so memory_leak_test.php
diff --git a/php/tests/generated_class_test.php b/php/tests/generated_class_test.php
index 7f8567b8..9f20bddc 100644
--- a/php/tests/generated_class_test.php
+++ b/php/tests/generated_class_test.php
@@ -1,15 +1,28 @@
 <?php
 
-require_once('generated/NoNameSpaceEnum.php');
-require_once('generated/NoNameSpaceMessage.php');
+require_once('generated/NoNamespaceEnum.php');
+require_once('generated/NoNamespaceMessage.php');
 require_once('test_base.php');
 require_once('test_util.php');
 
 use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\MapField;
 use Google\Protobuf\Internal\GPBType;
+use Bar\TestLegacyMessage;
+use Bar\TestLegacyMessage_NestedEnum;
+use Bar\TestLegacyMessage_NestedMessage;
 use Foo\TestEnum;
+use Foo\TestIncludeNamespaceMessage;
+use Foo\TestIncludePrefixMessage;
 use Foo\TestMessage;
+use Foo\TestMessage\Sub;
 use Foo\TestMessage_Sub;
+use Foo\TestMessage\NestedEnum;
+use Foo\TestReverseFieldOrder;
+use Foo\testLowerCaseMessage;
+use Foo\testLowerCaseEnum;
+use PBEmpty\PBEcho\TestEmptyPackage;
+use Php\Test\TestNamespace;
 
 class GeneratedClassTest extends TestBase
 {
@@ -58,24 +71,6 @@ class GeneratedClassTest extends TestBase
         $this->assertSame(MIN_INT32, $m->getOptionalInt32());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32FieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalInt32(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32FieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalInt32('abc');
-    }
-
     #########################################################
     # Test uint32 field.
     #########################################################
@@ -115,24 +110,6 @@ class GeneratedClassTest extends TestBase
         $this->assertSame(MIN_INT32, $m->getOptionalUint32());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32FieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalUint32(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32FieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalUint32('abc');
-    }
-
     #########################################################
     # Test int64 field.
     #########################################################
@@ -185,24 +162,6 @@ class GeneratedClassTest extends TestBase
         }
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64FieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalInt64(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64FieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalInt64('abc');
-    }
-
     #########################################################
     # Test uint64 field.
     #########################################################
@@ -250,24 +209,6 @@ class GeneratedClassTest extends TestBase
         }
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64FieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalUint64(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64FieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalUint64('abc');
-    }
-
     #########################################################
     # Test enum field.
     #########################################################
@@ -293,6 +234,29 @@ class GeneratedClassTest extends TestBase
         $this->assertEquals(TestEnum::ONE, $m->getOptionalEnum());
     }
 
+    public function testNestedEnum()
+    {
+        $m = new TestMessage();
+        $m->setOptionalNestedEnum(NestedEnum::ZERO);
+    }
+
+    public function testLegacyNestedEnum()
+    {
+        $m = new TestMessage();
+        $m->setOptionalNestedEnum(\Foo\TestMessage_NestedEnum::ZERO);
+    }
+
+    public function testLegacyTypehintWithNestedEnums()
+    {
+        $this->legacyEnum(new TestLegacyMessage\NestedEnum);
+    }
+
+    private function legacyEnum(TestLegacyMessage_NestedEnum $enum)
+    {
+        // If we made it here without a PHP Fatal error, the typehint worked
+        $this->assertTrue(true);
+    }
+
     #########################################################
     # Test float field.
     #########################################################
@@ -316,24 +280,6 @@ class GeneratedClassTest extends TestBase
         $this->assertEquals(3.1, $m->getOptionalFloat(), '', MAX_FLOAT_DIFF);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatFieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalFloat(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatFieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalFloat('abc');
-    }
-
     #########################################################
     # Test double field.
     #########################################################
@@ -357,24 +303,6 @@ class GeneratedClassTest extends TestBase
         $this->assertEquals(3.1, $m->getOptionalDouble(), '', MAX_FLOAT_DIFF);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleFieldInvalidTypeFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalDouble(new TestMessage());
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleFieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalDouble('abc');
-    }
-
     #########################################################
     # Test bool field.
     #########################################################
@@ -400,15 +328,6 @@ class GeneratedClassTest extends TestBase
         $this->assertSame(false, $m->getOptionalBool());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testBoolFieldInvalidStringFail()
-    {
-        $m = new TestMessage();
-        $m->setOptionalBool(new TestMessage());
-    }
-
     #########################################################
     # Test string field.
     #########################################################
@@ -434,16 +353,6 @@ class GeneratedClassTest extends TestBase
         $this->assertSame('1', $m->getOptionalString());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringFieldInvalidUTF8Fail()
-    {
-        $m = new TestMessage();
-        $hex = hex2bin("ff");
-        $m->setOptionalString($hex);
-    }
-
     #########################################################
     # Test bytes field.
     #########################################################
@@ -484,7 +393,7 @@ class GeneratedClassTest extends TestBase
     {
         $m = new TestMessage();
 
-        $sub_m = new TestMessage_Sub();
+        $sub_m = new Sub();
         $sub_m->setA(1);
         $m->setOptionalMessage($sub_m);
         $this->assertSame(1, $m->getOptionalMessage()->getA());
@@ -494,23 +403,29 @@ class GeneratedClassTest extends TestBase
         $this->assertNull($m->getOptionalMessage());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageFieldWrongTypeFail()
+    public function testLegacyMessageField()
     {
         $m = new TestMessage();
-        $a = 1;
-        $m->setOptionalMessage($a);
+
+        $sub_m = new TestMessage_Sub();
+        $sub_m->setA(1);
+        $m->setOptionalMessage($sub_m);
+        $this->assertSame(1, $m->getOptionalMessage()->getA());
+
+        $null = null;
+        $m->setOptionalMessage($null);
+        $this->assertNull($m->getOptionalMessage());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageFieldWrongClassFail()
+    public function testLegacyTypehintWithNestedMessages()
     {
-        $m = new TestMessage();
-        $m->setOptionalMessage(new TestMessage());
+        $this->legacyMessage(new TestLegacyMessage\NestedMessage);
+    }
+
+    private function legacyMessage(TestLegacyMessage_NestedMessage $sub)
+    {
+        // If we made it here without a PHP Fatal error, the typehint worked
+        $this->assertTrue(true);
     }
 
     #########################################################
@@ -526,46 +441,55 @@ class GeneratedClassTest extends TestBase
         $this->assertSame($repeated_int32, $m->getRepeatedInt32());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRepeatedFieldWrongTypeFail()
+    public function testRepeatedFieldViaArray()
     {
         $m = new TestMessage();
-        $a = 1;
-        $m->setRepeatedInt32($a);
-    }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRepeatedFieldWrongObjectFail()
-    {
-        $m = new TestMessage();
-        $m->setRepeatedInt32($m);
+        $arr = array();
+        $m->setRepeatedInt32($arr);
+        $this->assertSame(0, count($m->getRepeatedInt32()));
+
+        $arr = array(1, 2.1, "3");
+        $m->setRepeatedInt32($arr);
+        $this->assertTrue($m->getRepeatedInt32() instanceof RepeatedField);
+        $this->assertSame("Google\Protobuf\Internal\RepeatedField",
+                          get_class($m->getRepeatedInt32()));
+        $this->assertSame(3, count($m->getRepeatedInt32()));
+        $this->assertSame(1, $m->getRepeatedInt32()[0]);
+        $this->assertSame(2, $m->getRepeatedInt32()[1]);
+        $this->assertSame(3, $m->getRepeatedInt32()[2]);
+        $this->assertFalse($arr instanceof RepeatedField);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRepeatedFieldWrongRepeatedTypeFail()
+    #########################################################
+    # Test map field.
+    #########################################################
+
+    public function testMapField()
     {
         $m = new TestMessage();
 
-        $repeated_int32 = new RepeatedField(GPBType::UINT32);
-        $m->setRepeatedInt32($repeated_int32);
+        $map_int32_int32 = new MapField(GPBType::INT32, GPBType::INT32);
+        $m->setMapInt32Int32($map_int32_int32);
+        $this->assertSame($map_int32_int32, $m->getMapInt32Int32());
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testRepeatedFieldWrongRepeatedMessageClassFail()
+    public function testMapFieldViaArray()
     {
         $m = new TestMessage();
 
-        $repeated_message = new RepeatedField(GPBType::MESSAGE,
-                                              TestMessage::class);
-        $m->setRepeatedMessage($repeated_message);
+        $dict = array();
+        $m->setMapInt32Int32($dict);
+        $this->assertSame(0, count($m->getMapInt32Int32()));
+
+        $dict = array(5 => 5, 6.1 => 6.1, "7" => "7");
+        $m->setMapInt32Int32($dict);
+        $this->assertTrue($m->getMapInt32Int32() instanceof MapField);
+        $this->assertSame(3, count($m->getMapInt32Int32()));
+        $this->assertSame(5, $m->getMapInt32Int32()[5]);
+        $this->assertSame(6, $m->getMapInt32Int32()[6]);
+        $this->assertSame(7, $m->getMapInt32Int32()[7]);
+        $this->assertFalse($dict instanceof MapField);
     }
 
     #########################################################
@@ -598,7 +522,7 @@ class GeneratedClassTest extends TestBase
         $this->assertSame(NULL, $m->getOneofMessage());
         $this->assertSame("oneof_string", $m->getMyOneof());
 
-        $sub_m = new TestMessage_Sub();
+        $sub_m = new Sub();
         $sub_m->setA(1);
         $m->setOneofMessage($sub_m);
         $this->assertSame(0, $m->getOneofInt32());
@@ -637,26 +561,46 @@ class GeneratedClassTest extends TestBase
 
         // Singular
         $n->setOptionalInt32(100);
-        $sub1 = new TestMessage_Sub();
+        $sub1 = new Sub();
         $sub1->setA(101);
-        $sub1->getB()[] = 102;
+
+        $b = $sub1->getB();
+        $b[] = 102;
+        $sub1->setB($b);
+
         $n->setOptionalMessage($sub1);
 
         // Repeated
-        $n->getRepeatedInt32()[] = 200;
-        $n->getRepeatedString()[] = 'abc';
-        $sub2 = new TestMessage_Sub();
+        $repeatedInt32 = $n->getRepeatedInt32();
+        $repeatedInt32[] = 200;
+        $n->setRepeatedInt32($repeatedInt32);
+
+        $repeatedString = $n->getRepeatedString();
+        $repeatedString[] = 'abc';
+        $n->setRepeatedString($repeatedString);
+
+        $sub2 = new Sub();
         $sub2->setA(201);
-        $n->getRepeatedMessage()[] = $sub2;
+        $repeatedMessage = $n->getRepeatedMessage();
+        $repeatedMessage[] = $sub2;
+        $n->setRepeatedMessage($repeatedMessage);
 
         // Map
-        $n->getMapInt32Int32()[1] = 300;
-        $n->getMapInt32Int32()[-62] = 301;
-        $n->getMapStringString()['def'] = 'def';
-        $n->getMapInt32Message()[1] = new TestMessage_Sub();
-        $n->getMapInt32Message()[1]->setA(302);
-        $n->getMapInt32Message()[2] = new TestMessage_Sub();
-        $n->getMapInt32Message()[2]->setA(303);
+        $mapInt32Int32 = $n->getMapInt32Int32();
+        $mapInt32Int32[1] = 300;
+        $mapInt32Int32[-62] = 301;
+        $n->setMapInt32Int32($mapInt32Int32);
+
+        $mapStringString = $n->getMapStringString();
+        $mapStringString['def'] = 'def';
+        $n->setMapStringString($mapStringString);
+
+        $mapInt32Message = $n->getMapInt32Message();
+        $mapInt32Message[1] = new Sub();
+        $mapInt32Message[1]->setA(302);
+        $mapInt32Message[2] = new Sub();
+        $mapInt32Message[2]->setA(303);
+        $n->setMapInt32Message($mapInt32Message);
 
         $m->mergeFrom($n);
 
@@ -691,9 +635,16 @@ class GeneratedClassTest extends TestBase
         // Check sub-messages are copied by value.
         $n->getOptionalMessage()->setA(-101);
         $this->assertSame(101, $m->getOptionalMessage()->getA());
-        $n->getRepeatedMessage()[0]->setA(-201);
+
+        $repeatedMessage = $n->getRepeatedMessage();
+        $repeatedMessage[0]->setA(-201);
+        $n->setRepeatedMessage($repeatedMessage);
         $this->assertSame(201, $m->getRepeatedMessage()[2]->getA());
-        $n->getMapInt32Message()[1]->setA(-302);
+
+        $mapInt32Message = $n->getMapInt32Message();
+        $mapInt32Message[1]->setA(-302);
+        $n->setMapInt32Message($mapInt32Message);
+
         $this->assertSame(302, $m->getMapInt32Message()[1]->getA());
 
         // Test merge oneof.
@@ -704,7 +655,7 @@ class GeneratedClassTest extends TestBase
         $m->mergeFrom($n);
         $this->assertSame(1, $m->getOneofInt32());
 
-        $sub = new TestMessage_Sub();
+        $sub = new Sub();
         $n->setOneofMessage($sub);
         $n->getOneofMessage()->setA(400);
         $m->mergeFrom($n);
@@ -720,27 +671,675 @@ class GeneratedClassTest extends TestBase
         $this->expectFields($n);
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageMergeFromInvalidTypeFail()
+    #########################################################
+    # Test message/enum without namespace.
+    #########################################################
+
+    public function testMessageWithoutNamespace()
     {
         $m = new TestMessage();
-        $n = new TestMessage_Sub();
-        $m->mergeFrom($n);
+        $n = new NoNameSpaceMessage();
+        $m->setOptionalNoNamespaceMessage($n);
+        $repeatedNoNamespaceMessage = $m->getRepeatedNoNamespaceMessage();
+        $repeatedNoNamespaceMessage[] = new NoNameSpaceMessage();
+        $m->setRepeatedNoNamespaceMessage($repeatedNoNamespaceMessage);
+
+        // test nested messages
+        $sub = new NoNamespaceMessage\NestedMessage();
+        $n->setNestedMessage($sub);
+    }
+
+    public function testEnumWithoutNamespace()
+    {
+        $m = new TestMessage();
+        $m->setOptionalNoNamespaceEnum(NoNameSpaceEnum::VALUE_A);
+        $repeatedNoNamespaceEnum = $m->getRepeatedNoNamespaceEnum();
+        $repeatedNoNamespaceEnum[] = NoNameSpaceEnum::VALUE_A;
+        $m->setRepeatedNoNamespaceEnum($repeatedNoNamespaceEnum);
     }
 
     #########################################################
-    # Test message/enum without namespace.
+    # Test message with given namespace.
     #########################################################
 
-    public function testMessageWithoutNamespace()
+    public function testNestedMessagesAndEnums()
     {
-        $m = new NoNameSpaceMessage();
+        $m = new TestMessage();
+        $n = new TestMessage\Sub();
+        $m->setOptionalMessage($n);
+        $m->setOptionalNestedEnum(TestMessage\NestedEnum::ZERO);
+        $this->assertSame($n, $m->getOptionalMessage());
+        $this->assertSame(TestMessage\NestedEnum::ZERO, $m->getOptionalNestedEnum());
     }
 
-    public function testEnumWithoutNamespace()
+    public function testMessagesAndEnumsWithPrefix()
+    {
+        // Test message prefix
+        $m = new TestIncludePrefixMessage();
+        $n = new PrefixTestPrefix();
+        $n->setA(1);
+        $m->setPrefixMessage($n);
+        $this->assertSame(1, $m->getPrefixMessage()->getA());
+
+        // Test nested message prefix
+        $o = new PrefixTestPrefix();
+        $p = new PrefixTestPrefix\PrefixNestedMessage();
+        $o->setNestedMessage($p);
+        $o->setNestedEnum(PrefixTestPrefix\PrefixNestedEnum::ZERO);
+        $this->assertSame($p, $o->getNestedMessage());
+        $this->assertSame(PrefixTestPrefix\PrefixNestedEnum::ZERO, $o->getNestedEnum());
+    }
+
+    public function testMessagesAndEnumsWithPhpNamespace()
+    {
+        $m = new TestNamespace();
+        $n = new TestNamespace\NestedMessage();
+        $m->setNestedMessage($n);
+        $m->setNestedEnum(TestNamespace\NestedEnum::ZERO);
+        $this->assertSame($n, $m->getNestedMessage());
+        $this->assertSame(TestNamespace\NestedEnum::ZERO, $m->getNestedEnum());
+    }
+
+    public function testMesssagesAndEnumsWithEmptyPhpNamespace()
+    {
+        $m = new TestEmptyNamespace();
+        $n = new TestEmptyNamespace\NestedMessage();
+        $m->setNestedMessage($n);
+        $m->setNestedEnum(TestEmptyNamespace\NestedEnum::ZERO);
+        $this->assertSame($n, $m->getNestedMessage());
+        $this->assertSame(TestEmptyNamespace\NestedEnum::ZERO, $m->getNestedEnum());
+    }
+
+    public function testMessagesAndEnumsWithNoNamespace()
+    {
+        $m = new NoNamespaceMessage();
+        $n = new NoNamespaceMessage\NestedMessage();
+        $m->setNestedMessage($n);
+        $m->setNestedEnum(NoNamespaceMessage\NestedEnum::ZERO);
+        $this->assertSame($n, $m->getNestedMessage());
+        $this->assertSame(NoNamespaceMessage\NestedEnum::ZERO, $m->getNestedEnum());
+    }
+
+    public function testReservedWordsInPackageName()
+    {
+        $m = new TestEmptyPackage();
+        $n = new TestEmptyPackage\NestedMessage();
+        $m->setNestedMessage($n);
+        $m->setNestedEnum(TestEmptyPackage\NestedEnum::ZERO);
+        $this->assertSame($n, $m->getNestedMessage());
+        $this->assertSame(TestEmptyPackage\NestedEnum::ZERO, $m->getNestedEnum());
+    }
+
+    public function testReservedWordsInNamespace()
+    {
+        $m = new TestNamespace();
+        $n = new TestNamespace\PBEmpty();
+        $o = new TestNamespace\PBEmpty\NestedMessage();
+        $n->setNestedMessage($o);
+        $n->setNestedEnum(TestNamespace\PBEmpty\NestedEnum::ZERO);
+        $m->setReservedName($n);
+        $this->assertSame($n, $m->getReservedName());
+        $this->assertSame($o, $n->getNestedMessage());
+        $this->assertSame(
+            TestNamespace\PBEmpty\NestedEnum::ZERO,
+            $n->getNestedEnum()
+        );
+    }
+
+    #########################################################
+    # Test prefix for reserved words.
+    #########################################################
+
+    public function testPrefixForReservedWords()
+    {
+        $m = new \Foo\TestMessage\PBEmpty();
+        $m = new \Foo\PBEmpty();
+        $m = new \PrefixEmpty();
+        $m = new \Foo\PBARRAY();
+
+        $m = new \Lower\PBabstract();
+        $m = new \Lower\PBand();
+        $m = new \Lower\PBarray();
+        $m = new \Lower\PBas();
+        $m = new \Lower\PBbreak();
+        $m = new \Lower\PBcallable();
+        $m = new \Lower\PBcase();
+        $m = new \Lower\PBcatch();
+        $m = new \Lower\PBclass();
+        $m = new \Lower\PBclone();
+        $m = new \Lower\PBconst();
+        $m = new \Lower\PBcontinue();
+        $m = new \Lower\PBdeclare();
+        $m = new \Lower\PBdefault();
+        $m = new \Lower\PBdie();
+        $m = new \Lower\PBdo();
+        $m = new \Lower\PBecho();
+        $m = new \Lower\PBelse();
+        $m = new \Lower\PBelseif();
+        $m = new \Lower\PBempty();
+        $m = new \Lower\PBenddeclare();
+        $m = new \Lower\PBendfor();
+        $m = new \Lower\PBendforeach();
+        $m = new \Lower\PBendif();
+        $m = new \Lower\PBendswitch();
+        $m = new \Lower\PBendwhile();
+        $m = new \Lower\PBeval();
+        $m = new \Lower\PBexit();
+        $m = new \Lower\PBextends();
+        $m = new \Lower\PBfinal();
+        $m = new \Lower\PBfor();
+        $m = new \Lower\PBforeach();
+        $m = new \Lower\PBfunction();
+        $m = new \Lower\PBglobal();
+        $m = new \Lower\PBgoto();
+        $m = new \Lower\PBif();
+        $m = new \Lower\PBimplements();
+        $m = new \Lower\PBinclude();
+        $m = new \Lower\PBinclude_once();
+        $m = new \Lower\PBinstanceof();
+        $m = new \Lower\PBinsteadof();
+        $m = new \Lower\PBinterface();
+        $m = new \Lower\PBisset();
+        $m = new \Lower\PBlist();
+        $m = new \Lower\PBnamespace();
+        $m = new \Lower\PBnew();
+        $m = new \Lower\PBor();
+        $m = new \Lower\PBprint();
+        $m = new \Lower\PBprivate();
+        $m = new \Lower\PBprotected();
+        $m = new \Lower\PBpublic();
+        $m = new \Lower\PBrequire();
+        $m = new \Lower\PBrequire_once();
+        $m = new \Lower\PBreturn();
+        $m = new \Lower\PBstatic();
+        $m = new \Lower\PBswitch();
+        $m = new \Lower\PBthrow();
+        $m = new \Lower\PBtrait();
+        $m = new \Lower\PBtry();
+        $m = new \Lower\PBunset();
+        $m = new \Lower\PBuse();
+        $m = new \Lower\PBvar();
+        $m = new \Lower\PBwhile();
+        $m = new \Lower\PBxor();
+        $m = new \Lower\PBint();
+        $m = new \Lower\PBfloat();
+        $m = new \Lower\PBbool();
+        $m = new \Lower\PBstring();
+        $m = new \Lower\PBtrue();
+        $m = new \Lower\PBfalse();
+        $m = new \Lower\PBnull();
+        $m = new \Lower\PBvoid();
+        $m = new \Lower\PBiterable();
+
+        $m = new \Upper\PBABSTRACT();
+        $m = new \Upper\PBAND();
+        $m = new \Upper\PBARRAY();
+        $m = new \Upper\PBAS();
+        $m = new \Upper\PBBREAK();
+        $m = new \Upper\PBCALLABLE();
+        $m = new \Upper\PBCASE();
+        $m = new \Upper\PBCATCH();
+        $m = new \Upper\PBCLASS();
+        $m = new \Upper\PBCLONE();
+        $m = new \Upper\PBCONST();
+        $m = new \Upper\PBCONTINUE();
+        $m = new \Upper\PBDECLARE();
+        $m = new \Upper\PBDEFAULT();
+        $m = new \Upper\PBDIE();
+        $m = new \Upper\PBDO();
+        $m = new \Upper\PBECHO();
+        $m = new \Upper\PBELSE();
+        $m = new \Upper\PBELSEIF();
+        $m = new \Upper\PBEMPTY();
+        $m = new \Upper\PBENDDECLARE();
+        $m = new \Upper\PBENDFOR();
+        $m = new \Upper\PBENDFOREACH();
+        $m = new \Upper\PBENDIF();
+        $m = new \Upper\PBENDSWITCH();
+        $m = new \Upper\PBENDWHILE();
+        $m = new \Upper\PBEVAL();
+        $m = new \Upper\PBEXIT();
+        $m = new \Upper\PBEXTENDS();
+        $m = new \Upper\PBFINAL();
+        $m = new \Upper\PBFOR();
+        $m = new \Upper\PBFOREACH();
+        $m = new \Upper\PBFUNCTION();
+        $m = new \Upper\PBGLOBAL();
+        $m = new \Upper\PBGOTO();
+        $m = new \Upper\PBIF();
+        $m = new \Upper\PBIMPLEMENTS();
+        $m = new \Upper\PBINCLUDE();
+        $m = new \Upper\PBINCLUDE_ONCE();
+        $m = new \Upper\PBINSTANCEOF();
+        $m = new \Upper\PBINSTEADOF();
+        $m = new \Upper\PBINTERFACE();
+        $m = new \Upper\PBISSET();
+        $m = new \Upper\PBLIST();
+        $m = new \Upper\PBNAMESPACE();
+        $m = new \Upper\PBNEW();
+        $m = new \Upper\PBOR();
+        $m = new \Upper\PBPRINT();
+        $m = new \Upper\PBPRIVATE();
+        $m = new \Upper\PBPROTECTED();
+        $m = new \Upper\PBPUBLIC();
+        $m = new \Upper\PBREQUIRE();
+        $m = new \Upper\PBREQUIRE_ONCE();
+        $m = new \Upper\PBRETURN();
+        $m = new \Upper\PBSTATIC();
+        $m = new \Upper\PBSWITCH();
+        $m = new \Upper\PBTHROW();
+        $m = new \Upper\PBTRAIT();
+        $m = new \Upper\PBTRY();
+        $m = new \Upper\PBUNSET();
+        $m = new \Upper\PBUSE();
+        $m = new \Upper\PBVAR();
+        $m = new \Upper\PBWHILE();
+        $m = new \Upper\PBXOR();
+        $m = new \Upper\PBINT();
+        $m = new \Upper\PBFLOAT();
+        $m = new \Upper\PBBOOL();
+        $m = new \Upper\PBSTRING();
+        $m = new \Upper\PBTRUE();
+        $m = new \Upper\PBFALSE();
+        $m = new \Upper\PBNULL();
+        $m = new \Upper\PBVOID();
+        $m = new \Upper\PBITERABLE();
+
+        $m = new \Lower_enum\PBabstract();
+        $m = new \Lower_enum\PBand();
+        $m = new \Lower_enum\PBarray();
+        $m = new \Lower_enum\PBas();
+        $m = new \Lower_enum\PBbreak();
+        $m = new \Lower_enum\PBcallable();
+        $m = new \Lower_enum\PBcase();
+        $m = new \Lower_enum\PBcatch();
+        $m = new \Lower_enum\PBclass();
+        $m = new \Lower_enum\PBclone();
+        $m = new \Lower_enum\PBconst();
+        $m = new \Lower_enum\PBcontinue();
+        $m = new \Lower_enum\PBdeclare();
+        $m = new \Lower_enum\PBdefault();
+        $m = new \Lower_enum\PBdie();
+        $m = new \Lower_enum\PBdo();
+        $m = new \Lower_enum\PBecho();
+        $m = new \Lower_enum\PBelse();
+        $m = new \Lower_enum\PBelseif();
+        $m = new \Lower_enum\PBempty();
+        $m = new \Lower_enum\PBenddeclare();
+        $m = new \Lower_enum\PBendfor();
+        $m = new \Lower_enum\PBendforeach();
+        $m = new \Lower_enum\PBendif();
+        $m = new \Lower_enum\PBendswitch();
+        $m = new \Lower_enum\PBendwhile();
+        $m = new \Lower_enum\PBeval();
+        $m = new \Lower_enum\PBexit();
+        $m = new \Lower_enum\PBextends();
+        $m = new \Lower_enum\PBfinal();
+        $m = new \Lower_enum\PBfor();
+        $m = new \Lower_enum\PBforeach();
+        $m = new \Lower_enum\PBfunction();
+        $m = new \Lower_enum\PBglobal();
+        $m = new \Lower_enum\PBgoto();
+        $m = new \Lower_enum\PBif();
+        $m = new \Lower_enum\PBimplements();
+        $m = new \Lower_enum\PBinclude();
+        $m = new \Lower_enum\PBinclude_once();
+        $m = new \Lower_enum\PBinstanceof();
+        $m = new \Lower_enum\PBinsteadof();
+        $m = new \Lower_enum\PBinterface();
+        $m = new \Lower_enum\PBisset();
+        $m = new \Lower_enum\PBlist();
+        $m = new \Lower_enum\PBnamespace();
+        $m = new \Lower_enum\PBnew();
+        $m = new \Lower_enum\PBor();
+        $m = new \Lower_enum\PBprint();
+        $m = new \Lower_enum\PBprivate();
+        $m = new \Lower_enum\PBprotected();
+        $m = new \Lower_enum\PBpublic();
+        $m = new \Lower_enum\PBrequire();
+        $m = new \Lower_enum\PBrequire_once();
+        $m = new \Lower_enum\PBreturn();
+        $m = new \Lower_enum\PBstatic();
+        $m = new \Lower_enum\PBswitch();
+        $m = new \Lower_enum\PBthrow();
+        $m = new \Lower_enum\PBtrait();
+        $m = new \Lower_enum\PBtry();
+        $m = new \Lower_enum\PBunset();
+        $m = new \Lower_enum\PBuse();
+        $m = new \Lower_enum\PBvar();
+        $m = new \Lower_enum\PBwhile();
+        $m = new \Lower_enum\PBxor();
+        $m = new \Lower_enum\PBint();
+        $m = new \Lower_enum\PBfloat();
+        $m = new \Lower_enum\PBbool();
+        $m = new \Lower_enum\PBstring();
+        $m = new \Lower_enum\PBtrue();
+        $m = new \Lower_enum\PBfalse();
+        $m = new \Lower_enum\PBnull();
+        $m = new \Lower_enum\PBvoid();
+        $m = new \Lower_enum\PBiterable();
+
+        $m = new \Upper_enum\PBABSTRACT();
+        $m = new \Upper_enum\PBAND();
+        $m = new \Upper_enum\PBARRAY();
+        $m = new \Upper_enum\PBAS();
+        $m = new \Upper_enum\PBBREAK();
+        $m = new \Upper_enum\PBCALLABLE();
+        $m = new \Upper_enum\PBCASE();
+        $m = new \Upper_enum\PBCATCH();
+        $m = new \Upper_enum\PBCLASS();
+        $m = new \Upper_enum\PBCLONE();
+        $m = new \Upper_enum\PBCONST();
+        $m = new \Upper_enum\PBCONTINUE();
+        $m = new \Upper_enum\PBDECLARE();
+        $m = new \Upper_enum\PBDEFAULT();
+        $m = new \Upper_enum\PBDIE();
+        $m = new \Upper_enum\PBDO();
+        $m = new \Upper_enum\PBECHO();
+        $m = new \Upper_enum\PBELSE();
+        $m = new \Upper_enum\PBELSEIF();
+        $m = new \Upper_enum\PBEMPTY();
+        $m = new \Upper_enum\PBENDDECLARE();
+        $m = new \Upper_enum\PBENDFOR();
+        $m = new \Upper_enum\PBENDFOREACH();
+        $m = new \Upper_enum\PBENDIF();
+        $m = new \Upper_enum\PBENDSWITCH();
+        $m = new \Upper_enum\PBENDWHILE();
+        $m = new \Upper_enum\PBEVAL();
+        $m = new \Upper_enum\PBEXIT();
+        $m = new \Upper_enum\PBEXTENDS();
+        $m = new \Upper_enum\PBFINAL();
+        $m = new \Upper_enum\PBFOR();
+        $m = new \Upper_enum\PBFOREACH();
+        $m = new \Upper_enum\PBFUNCTION();
+        $m = new \Upper_enum\PBGLOBAL();
+        $m = new \Upper_enum\PBGOTO();
+        $m = new \Upper_enum\PBIF();
+        $m = new \Upper_enum\PBIMPLEMENTS();
+        $m = new \Upper_enum\PBINCLUDE();
+        $m = new \Upper_enum\PBINCLUDE_ONCE();
+        $m = new \Upper_enum\PBINSTANCEOF();
+        $m = new \Upper_enum\PBINSTEADOF();
+        $m = new \Upper_enum\PBINTERFACE();
+        $m = new \Upper_enum\PBISSET();
+        $m = new \Upper_enum\PBLIST();
+        $m = new \Upper_enum\PBNAMESPACE();
+        $m = new \Upper_enum\PBNEW();
+        $m = new \Upper_enum\PBOR();
+        $m = new \Upper_enum\PBPRINT();
+        $m = new \Upper_enum\PBPRIVATE();
+        $m = new \Upper_enum\PBPROTECTED();
+        $m = new \Upper_enum\PBPUBLIC();
+        $m = new \Upper_enum\PBREQUIRE();
+        $m = new \Upper_enum\PBREQUIRE_ONCE();
+        $m = new \Upper_enum\PBRETURN();
+        $m = new \Upper_enum\PBSTATIC();
+        $m = new \Upper_enum\PBSWITCH();
+        $m = new \Upper_enum\PBTHROW();
+        $m = new \Upper_enum\PBTRAIT();
+        $m = new \Upper_enum\PBTRY();
+        $m = new \Upper_enum\PBUNSET();
+        $m = new \Upper_enum\PBUSE();
+        $m = new \Upper_enum\PBVAR();
+        $m = new \Upper_enum\PBWHILE();
+        $m = new \Upper_enum\PBXOR();
+        $m = new \Upper_enum\PBINT();
+        $m = new \Upper_enum\PBFLOAT();
+        $m = new \Upper_enum\PBBOOL();
+        $m = new \Upper_enum\PBSTRING();
+        $m = new \Upper_enum\PBTRUE();
+        $m = new \Upper_enum\PBFALSE();
+        $m = new \Upper_enum\PBNULL();
+        $m = new \Upper_enum\PBVOID();
+        $m = new \Upper_enum\PBITERABLE();
+
+        $m = \Lower_enum_value\NotAllowed::PBabstract;
+        $m = \Lower_enum_value\NotAllowed::PBand;
+        $m = \Lower_enum_value\NotAllowed::PBarray;
+        $m = \Lower_enum_value\NotAllowed::PBas;
+        $m = \Lower_enum_value\NotAllowed::PBbreak;
+        $m = \Lower_enum_value\NotAllowed::PBcallable;
+        $m = \Lower_enum_value\NotAllowed::PBcase;
+        $m = \Lower_enum_value\NotAllowed::PBcatch;
+        $m = \Lower_enum_value\NotAllowed::PBclass;
+        $m = \Lower_enum_value\NotAllowed::PBclone;
+        $m = \Lower_enum_value\NotAllowed::PBconst;
+        $m = \Lower_enum_value\NotAllowed::PBcontinue;
+        $m = \Lower_enum_value\NotAllowed::PBdeclare;
+        $m = \Lower_enum_value\NotAllowed::PBdefault;
+        $m = \Lower_enum_value\NotAllowed::PBdie;
+        $m = \Lower_enum_value\NotAllowed::PBdo;
+        $m = \Lower_enum_value\NotAllowed::PBecho;
+        $m = \Lower_enum_value\NotAllowed::PBelse;
+        $m = \Lower_enum_value\NotAllowed::PBelseif;
+        $m = \Lower_enum_value\NotAllowed::PBempty;
+        $m = \Lower_enum_value\NotAllowed::PBenddeclare;
+        $m = \Lower_enum_value\NotAllowed::PBendfor;
+        $m = \Lower_enum_value\NotAllowed::PBendforeach;
+        $m = \Lower_enum_value\NotAllowed::PBendif;
+        $m = \Lower_enum_value\NotAllowed::PBendswitch;
+        $m = \Lower_enum_value\NotAllowed::PBendwhile;
+        $m = \Lower_enum_value\NotAllowed::PBeval;
+        $m = \Lower_enum_value\NotAllowed::PBexit;
+        $m = \Lower_enum_value\NotAllowed::PBextends;
+        $m = \Lower_enum_value\NotAllowed::PBfinal;
+        $m = \Lower_enum_value\NotAllowed::PBfor;
+        $m = \Lower_enum_value\NotAllowed::PBforeach;
+        $m = \Lower_enum_value\NotAllowed::PBfunction;
+        $m = \Lower_enum_value\NotAllowed::PBglobal;
+        $m = \Lower_enum_value\NotAllowed::PBgoto;
+        $m = \Lower_enum_value\NotAllowed::PBif;
+        $m = \Lower_enum_value\NotAllowed::PBimplements;
+        $m = \Lower_enum_value\NotAllowed::PBinclude;
+        $m = \Lower_enum_value\NotAllowed::PBinclude_once;
+        $m = \Lower_enum_value\NotAllowed::PBinstanceof;
+        $m = \Lower_enum_value\NotAllowed::PBinsteadof;
+        $m = \Lower_enum_value\NotAllowed::PBinterface;
+        $m = \Lower_enum_value\NotAllowed::PBisset;
+        $m = \Lower_enum_value\NotAllowed::PBlist;
+        $m = \Lower_enum_value\NotAllowed::PBnamespace;
+        $m = \Lower_enum_value\NotAllowed::PBnew;
+        $m = \Lower_enum_value\NotAllowed::PBor;
+        $m = \Lower_enum_value\NotAllowed::PBprint;
+        $m = \Lower_enum_value\NotAllowed::PBprivate;
+        $m = \Lower_enum_value\NotAllowed::PBprotected;
+        $m = \Lower_enum_value\NotAllowed::PBpublic;
+        $m = \Lower_enum_value\NotAllowed::PBrequire;
+        $m = \Lower_enum_value\NotAllowed::PBrequire_once;
+        $m = \Lower_enum_value\NotAllowed::PBreturn;
+        $m = \Lower_enum_value\NotAllowed::PBstatic;
+        $m = \Lower_enum_value\NotAllowed::PBswitch;
+        $m = \Lower_enum_value\NotAllowed::PBthrow;
+        $m = \Lower_enum_value\NotAllowed::PBtrait;
+        $m = \Lower_enum_value\NotAllowed::PBtry;
+        $m = \Lower_enum_value\NotAllowed::PBunset;
+        $m = \Lower_enum_value\NotAllowed::PBuse;
+        $m = \Lower_enum_value\NotAllowed::PBvar;
+        $m = \Lower_enum_value\NotAllowed::PBwhile;
+        $m = \Lower_enum_value\NotAllowed::PBxor;
+        $m = \Lower_enum_value\NotAllowed::int;
+        $m = \Lower_enum_value\NotAllowed::float;
+        $m = \Lower_enum_value\NotAllowed::bool;
+        $m = \Lower_enum_value\NotAllowed::string;
+        $m = \Lower_enum_value\NotAllowed::true;
+        $m = \Lower_enum_value\NotAllowed::false;
+        $m = \Lower_enum_value\NotAllowed::null;
+        $m = \Lower_enum_value\NotAllowed::void;
+        $m = \Lower_enum_value\NotAllowed::iterable;
+
+        $m = \Upper_enum_value\NotAllowed::PBABSTRACT;
+        $m = \Upper_enum_value\NotAllowed::PBAND;
+        $m = \Upper_enum_value\NotAllowed::PBARRAY;
+        $m = \Upper_enum_value\NotAllowed::PBAS;
+        $m = \Upper_enum_value\NotAllowed::PBBREAK;
+        $m = \Upper_enum_value\NotAllowed::PBCALLABLE;
+        $m = \Upper_enum_value\NotAllowed::PBCASE;
+        $m = \Upper_enum_value\NotAllowed::PBCATCH;
+        $m = \Upper_enum_value\NotAllowed::PBCLASS;
+        $m = \Upper_enum_value\NotAllowed::PBCLONE;
+        $m = \Upper_enum_value\NotAllowed::PBCONST;
+        $m = \Upper_enum_value\NotAllowed::PBCONTINUE;
+        $m = \Upper_enum_value\NotAllowed::PBDECLARE;
+        $m = \Upper_enum_value\NotAllowed::PBDEFAULT;
+        $m = \Upper_enum_value\NotAllowed::PBDIE;
+        $m = \Upper_enum_value\NotAllowed::PBDO;
+        $m = \Upper_enum_value\NotAllowed::PBECHO;
+        $m = \Upper_enum_value\NotAllowed::PBELSE;
+        $m = \Upper_enum_value\NotAllowed::PBELSEIF;
+        $m = \Upper_enum_value\NotAllowed::PBEMPTY;
+        $m = \Upper_enum_value\NotAllowed::PBENDDECLARE;
+        $m = \Upper_enum_value\NotAllowed::PBENDFOR;
+        $m = \Upper_enum_value\NotAllowed::PBENDFOREACH;
+        $m = \Upper_enum_value\NotAllowed::PBENDIF;
+        $m = \Upper_enum_value\NotAllowed::PBENDSWITCH;
+        $m = \Upper_enum_value\NotAllowed::PBENDWHILE;
+        $m = \Upper_enum_value\NotAllowed::PBEVAL;
+        $m = \Upper_enum_value\NotAllowed::PBEXIT;
+        $m = \Upper_enum_value\NotAllowed::PBEXTENDS;
+        $m = \Upper_enum_value\NotAllowed::PBFINAL;
+        $m = \Upper_enum_value\NotAllowed::PBFOR;
+        $m = \Upper_enum_value\NotAllowed::PBFOREACH;
+        $m = \Upper_enum_value\NotAllowed::PBFUNCTION;
+        $m = \Upper_enum_value\NotAllowed::PBGLOBAL;
+        $m = \Upper_enum_value\NotAllowed::PBGOTO;
+        $m = \Upper_enum_value\NotAllowed::PBIF;
+        $m = \Upper_enum_value\NotAllowed::PBIMPLEMENTS;
+        $m = \Upper_enum_value\NotAllowed::PBINCLUDE;
+        $m = \Upper_enum_value\NotAllowed::PBINCLUDE_ONCE;
+        $m = \Upper_enum_value\NotAllowed::PBINSTANCEOF;
+        $m = \Upper_enum_value\NotAllowed::PBINSTEADOF;
+        $m = \Upper_enum_value\NotAllowed::PBINTERFACE;
+        $m = \Upper_enum_value\NotAllowed::PBISSET;
+        $m = \Upper_enum_value\NotAllowed::PBLIST;
+        $m = \Upper_enum_value\NotAllowed::PBNAMESPACE;
+        $m = \Upper_enum_value\NotAllowed::PBNEW;
+        $m = \Upper_enum_value\NotAllowed::PBOR;
+        $m = \Upper_enum_value\NotAllowed::PBPRINT;
+        $m = \Upper_enum_value\NotAllowed::PBPRIVATE;
+        $m = \Upper_enum_value\NotAllowed::PBPROTECTED;
+        $m = \Upper_enum_value\NotAllowed::PBPUBLIC;
+        $m = \Upper_enum_value\NotAllowed::PBREQUIRE;
+        $m = \Upper_enum_value\NotAllowed::PBREQUIRE_ONCE;
+        $m = \Upper_enum_value\NotAllowed::PBRETURN;
+        $m = \Upper_enum_value\NotAllowed::PBSTATIC;
+        $m = \Upper_enum_value\NotAllowed::PBSWITCH;
+        $m = \Upper_enum_value\NotAllowed::PBTHROW;
+        $m = \Upper_enum_value\NotAllowed::PBTRAIT;
+        $m = \Upper_enum_value\NotAllowed::PBTRY;
+        $m = \Upper_enum_value\NotAllowed::PBUNSET;
+        $m = \Upper_enum_value\NotAllowed::PBUSE;
+        $m = \Upper_enum_value\NotAllowed::PBVAR;
+        $m = \Upper_enum_value\NotAllowed::PBWHILE;
+        $m = \Upper_enum_value\NotAllowed::PBXOR;
+        $m = \Upper_enum_value\NotAllowed::INT;
+        $m = \Upper_enum_value\NotAllowed::FLOAT;
+        $m = \Upper_enum_value\NotAllowed::BOOL;
+        $m = \Upper_enum_value\NotAllowed::STRING;
+        $m = \Upper_enum_value\NotAllowed::TRUE;
+        $m = \Upper_enum_value\NotAllowed::FALSE;
+        $m = \Upper_enum_value\NotAllowed::NULL;
+        $m = \Upper_enum_value\NotAllowed::VOID;
+        $m = \Upper_enum_value\NotAllowed::ITERABLE;
+    }
+
+    #########################################################
+    # Test fluent setters.
+    #########################################################
+
+    public function testFluentSetters()
+    {
+        $m = (new TestMessage())
+            ->setOptionalInt32(1)
+            ->setOptionalUInt32(2);
+        $this->assertSame(1, $m->getOptionalInt32());
+        $this->assertSame(2, $m->getOptionalUInt32());
+    }
+
+    #########################################################
+    # Test Reverse Field Order.
+    #########################################################
+
+    public function testReverseFieldOrder()
+    {
+        $m = new TestReverseFieldOrder();
+        $m->setB("abc");
+        $this->assertSame("abc", $m->getB());
+        $this->assertNotSame("abc", $m->getA());
+    }
+
+    #########################################################
+    # Test Reverse Field Order.
+    #########################################################
+
+    public function testLowerCase()
+    {
+        $m = new testLowerCaseMessage();
+        $n = testLowerCaseEnum::VALUE;
+    }
+
+    #########################################################
+    # Test Array Constructor.
+    #########################################################
+
+    public function testArrayConstructor()
     {
-        $m = new NoNameSpaceEnum();
+        $m = new TestMessage([
+            'optional_int32' => -42,
+            'optional_int64' => -43,
+            'optional_uint32' => 42,
+            'optional_uint64' => 43,
+            'optional_sint32' => -44,
+            'optional_sint64' => -45,
+            'optional_fixed32' => 46,
+            'optional_fixed64' => 47,
+            'optional_sfixed32' => -46,
+            'optional_sfixed64' => -47,
+            'optional_float' => 1.5,
+            'optional_double' => 1.6,
+            'optional_bool' => true,
+            'optional_string' => 'a',
+            'optional_bytes' => 'b',
+            'optional_enum' => TestEnum::ONE,
+            'optional_message' => new Sub([
+                'a' => 33
+            ]),
+            'repeated_int32' => [-42, -52],
+            'repeated_int64' => [-43, -53],
+            'repeated_uint32' => [42, 52],
+            'repeated_uint64' => [43, 53],
+            'repeated_sint32' => [-44, -54],
+            'repeated_sint64' => [-45, -55],
+            'repeated_fixed32' => [46, 56],
+            'repeated_fixed64' => [47, 57],
+            'repeated_sfixed32' => [-46, -56],
+            'repeated_sfixed64' => [-47, -57],
+            'repeated_float' => [1.5, 2.5],
+            'repeated_double' => [1.6, 2.6],
+            'repeated_bool' => [true, false],
+            'repeated_string' => ['a', 'c'],
+            'repeated_bytes' => ['b', 'd'],
+            'repeated_enum' => [TestEnum::ZERO, TestEnum::ONE],
+            'repeated_message' => [new Sub(['a' => 34]),
+                                   new Sub(['a' => 35])],
+            'map_int32_int32' => [-62 => -62],
+            'map_int64_int64' => [-63 => -63],
+            'map_uint32_uint32' => [62 => 62],
+            'map_uint64_uint64' => [63 => 63],
+            'map_sint32_sint32' => [-64 => -64],
+            'map_sint64_sint64' => [-65 => -65],
+            'map_fixed32_fixed32' => [66 => 66],
+            'map_fixed64_fixed64' => [67 => 67],
+            'map_sfixed32_sfixed32' => [-68 => -68],
+            'map_sfixed64_sfixed64' => [-69 => -69],
+            'map_int32_float' => [1 => 3.5],
+            'map_int32_double' => [1 => 3.6],
+            'map_bool_bool' => [true => true],
+            'map_string_string' => ['e' => 'e'],
+            'map_int32_bytes' => [1 => 'f'],
+            'map_int32_enum' => [1 => TestEnum::ONE],
+            'map_int32_message' => [1 => new Sub(['a' => 36])],
+        ]);
+
+        TestUtil::assertTestMessage($m);
     }
 }
diff --git a/php/tests/generated_phpdoc_test.php b/php/tests/generated_phpdoc_test.php
new file mode 100644
index 00000000..526927fc
--- /dev/null
+++ b/php/tests/generated_phpdoc_test.php
@@ -0,0 +1,345 @@
+<?php
+
+require_once('generated/NoNamespaceEnum.php');
+require_once('generated/NoNamespaceMessage.php');
+require_once('test_base.php');
+require_once('test_util.php');
+
+use Foo\TestMessage;
+
+class GeneratedPhpdocTest extends TestBase
+{
+    public function testPhpDocForClass()
+    {
+        $class = new ReflectionClass('Foo\TestMessage');
+        $doc = $class->getDocComment();
+        $this->assertContains('foo.TestMessage', $doc);
+    }
+
+    public function testPhpDocForConstructor()
+    {
+        $class = new ReflectionClass('Foo\TestMessage');
+        $doc = $class->getMethod('__construct')->getDocComment();
+        $this->assertContains('@param array $data', $doc);
+        $this->assertContains('@type int $optional_int32', $doc);
+    }
+
+    /**
+     * @dataProvider providePhpDocForGettersAndSetters
+     */
+    public function testPhpDocForIntGetters($methods, $expectedDoc)
+    {
+        $class = new ReflectionClass('Foo\TestMessage');
+        foreach ($methods as $method) {
+            $doc = $class->getMethod($method)->getDocComment();
+            $this->assertContains($expectedDoc, $doc);
+        }
+    }
+
+    public function providePhpDocForGettersAndSetters()
+    {
+        return [
+            [
+                [
+                    'setOptionalInt32',
+                    'setOptionalUint32',
+                    'setOptionalSint32',
+                    'setOptionalFixed32',
+                    'setOptionalSfixed32',
+                    'setOneofInt32',
+                    'setOneofUint32',
+                    'setOneofSint32',
+                    'setOneofFixed32',
+                    'setOneofSfixed32',
+                    'setOptionalEnum',
+                    'setOptionalNoNamespaceEnum',
+                    'setOptionalNestedEnum',
+                    'setOneofEnum'
+                ],
+                '@param int $var'
+            ],
+            [
+                [
+                    'setOptionalInt64',
+                    'setOptionalUint64',
+                    'setOptionalSint64',
+                    'setOptionalFixed64',
+                    'setOptionalSfixed64',
+                    'setOneofInt64',
+                    'setOneofUint64',
+                    'setOneofSint64',
+                    'setOneofFixed64',
+                    'setOneofSfixed64',
+                ],
+                '@param int|string $var'
+            ],
+            [
+                [
+                    'getOptionalInt32',
+                    'getOptionalUint32',
+                    'getOptionalSint32',
+                    'getOptionalFixed32',
+                    'getOptionalSfixed32',
+                    'getOneofInt32',
+                    'getOneofUint32',
+                    'getOneofSint32',
+                    'getOneofFixed32',
+                    'getOneofSfixed32',
+                    'getOptionalEnum',
+                    'getOptionalNoNamespaceEnum',
+                    'getOptionalNestedEnum',
+                    'getOneofEnum',
+                ],
+                '@return int'
+            ],
+            [
+                [
+                    'setOptionalInt64',
+                    'setOptionalUint64',
+                    'setOptionalSint64',
+                    'setOptionalFixed64',
+                    'setOptionalSfixed64',
+                    'setOneofInt64',
+                    'setOneofUint64',
+                    'setOneofSint64',
+                    'setOneofFixed64',
+                    'setOneofSfixed64',
+                ],
+                '@param int|string $var'
+            ],
+            [
+                [
+                    'getRepeatedInt32',
+                    'getRepeatedInt64',
+                    'getRepeatedUint32',
+                    'getRepeatedUint64',
+                    'getRepeatedSint32',
+                    'getRepeatedSint64',
+                    'getRepeatedFixed32',
+                    'getRepeatedFixed64',
+                    'getRepeatedSfixed32',
+                    'getRepeatedSfixed64',
+                    'getRepeatedFloat',
+                    'getRepeatedDouble',
+                    'getRepeatedBool',
+                    'getRepeatedString',
+                    'getRepeatedBytes',
+                    'getRepeatedEnum',
+                    'getRepeatedMessage',
+                    'getRepeatedRecursive',
+                    'getRepeatedNoNamespaceMessage',
+                    'getRepeatedNoNamespaceEnum',
+                ],
+                '@return \Google\Protobuf\Internal\RepeatedField'
+            ],
+            [
+                [
+                    'getMapInt32Int32',
+                    'getMapInt64Int64',
+                    'getMapUint32Uint32',
+                    'getMapUint64Uint64',
+                    'getMapSint32Sint32',
+                    'getMapSint64Sint64',
+                    'getMapFixed32Fixed32',
+                    'getMapFixed64Fixed64',
+                    'getMapSfixed32Sfixed32',
+                    'getMapSfixed64Sfixed64',
+                    'getMapInt32Float',
+                    'getMapInt32Double',
+                    'getMapBoolBool',
+                    'getMapStringString',
+                    'getMapInt32Bytes',
+                    'getMapInt32Enum',
+                    'getMapInt32Message',
+                    'getMapRecursive',
+                ],
+                '@return \Google\Protobuf\Internal\MapField'
+            ],
+            [
+                [
+                    'setRepeatedInt32',
+                    'setRepeatedUint32',
+                    'setRepeatedSint32',
+                    'setRepeatedFixed32',
+                    'setRepeatedSfixed32',
+                    'setRepeatedEnum',
+                    'setRepeatedNoNamespaceEnum',
+                ],
+                '@param int[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedInt64',
+                    'setRepeatedUint64',
+                    'setRepeatedSint64',
+                    'setRepeatedFixed64',
+                    'setRepeatedSfixed64',
+                ],
+                '@param int[]|string[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedFloat',
+                    'setRepeatedDouble',
+                ],
+                '@param float[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedBool',
+                ],
+                '@param bool[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedString',
+                    'setRepeatedBytes',
+                ],
+                '@param string[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedMessage',
+                ],
+                '@param \Foo\TestMessage\Sub[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedRecursive',
+                ],
+                '@param \Foo\TestMessage[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setRepeatedNoNamespaceMessage',
+                ],
+                '@param \NoNamespaceMessage[]|\Google\Protobuf\Internal\RepeatedField $var'
+            ],
+            [
+                [
+                    'setMapInt32Int32',
+                    'setMapInt64Int64',
+                    'setMapUint32Uint32',
+                    'setMapUint64Uint64',
+                    'setMapSint32Sint32',
+                    'setMapSint64Sint64',
+                    'setMapFixed32Fixed32',
+                    'setMapFixed64Fixed64',
+                    'setMapSfixed32Sfixed32',
+                    'setMapSfixed64Sfixed64',
+                    'setMapInt32Float',
+                    'setMapInt32Double',
+                    'setMapBoolBool',
+                    'setMapStringString',
+                    'setMapInt32Bytes',
+                    'setMapInt32Enum',
+                    'setMapInt32Message',
+                    'setMapRecursive',
+                ],
+                '@param array|\Google\Protobuf\Internal\MapField $var'
+            ],
+            [
+                [
+                    'getOptionalFloat',
+                    'getOptionalDouble',
+                    'getOneofDouble',
+                    'getOneofFloat',
+                ],
+                '@return float'
+            ],
+            [
+                [
+                    'setOptionalFloat',
+                    'setOptionalDouble',
+                    'setOneofDouble',
+                    'setOneofFloat',
+                ],
+                '@param float $var'
+            ],
+            [
+                [
+                    'getOptionalBool',
+                    'getOneofBool',
+                ],
+                '@return bool'],
+            [
+                [
+                    'setOptionalBool',
+                    'setOneofBool',
+                ],
+                '@param bool $var'
+            ],
+            [
+                [
+                    'getOptionalString',
+                    'getOptionalBytes',
+                    'getOneofString',
+                    'getOneofBytes',
+                    'getMyOneof',
+                ],
+                '@return string'
+            ],
+            [
+                [
+                    'setOptionalString',
+                    'setOptionalBytes',
+                    'setOneofString',
+                    'setOneofBytes',
+                ],
+                '@param string $var'
+            ],
+
+            [
+                [
+                    'getOptionalMessage',
+                    'getOneofMessage'
+                ],
+                '@return \Foo\TestMessage\Sub'
+            ],
+            [
+                [
+                    'setOptionalMessage',
+                    'setOneofMessage'
+                ],
+                '@param \Foo\TestMessage\Sub $var'
+            ],
+            [
+                [
+                    'getOptionalIncludedMessage'
+                ],
+                '@return \Bar\TestInclude'
+            ],
+            [
+                [
+                    'setOptionalIncludedMessage'
+                ],
+                '@param \Bar\TestInclude $var'
+            ],
+            [
+                [
+                    'getRecursive'
+                ],
+                '@return \Foo\TestMessage'
+            ],
+            [
+                [
+                    'setRecursive'
+                ],
+                '@param \Foo\TestMessage $var'
+            ],
+
+            [
+                [
+                    'getOptionalNoNamespaceMessage'
+                ],
+                '@return \NoNamespaceMessage'
+            ],
+            [
+                [
+                    'setOptionalNoNamespaceMessage'
+                ],
+                '@param \NoNamespaceMessage $var'
+            ],
+        ];
+    }
+}
diff --git a/php/tests/generated_service_test.php b/php/tests/generated_service_test.php
new file mode 100644
index 00000000..5407db9a
--- /dev/null
+++ b/php/tests/generated_service_test.php
@@ -0,0 +1,110 @@
+<?php
+
+require_once('test_base.php');
+require_once('test_util.php');
+
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\MapField;
+use Google\Protobuf\Internal\GPBType;
+use Foo\Greeter;
+use Foo\HelloRequest;
+use Foo\HelloReply;
+
+class GeneratedServiceTest extends TestBase
+{
+    /**
+     * @var \ReflectionClass
+     */
+    private $serviceClass;
+
+    /**
+     * @var \ReflectionClass
+     */
+    private $namespacedServiceClass;
+
+    /**
+     * @var array
+     */
+    private $methodNames = [
+        'sayHello',
+        'sayHelloAgain'
+    ];
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->serviceClass = new ReflectionClass('Foo\GreeterInterface');
+
+        $this->namespacedServiceClass = new ReflectionClass('Bar\OtherGreeterInterface');
+    }
+
+    public function testIsInterface()
+    {
+        $this->assertTrue($this->serviceClass->isInterface());
+    }
+
+    public function testPhpDocForClass()
+    {
+        $this->assertContains('foo.Greeter', $this->serviceClass->getDocComment());
+    }
+
+    public function testPhpDocForNamespacedClass()
+    {
+        $this->assertContains('foo.OtherGreeter', $this->namespacedServiceClass->getDocComment());
+    }
+
+    public function testServiceMethodsAreGenerated()
+    {
+        $this->assertCount(count($this->methodNames), $this->serviceClass->getMethods());
+        foreach ($this->methodNames as $methodName) {
+            $this->assertTrue($this->serviceClass->hasMethod($methodName));
+        }
+    }
+
+    public function testPhpDocForServiceMethod()
+    {
+        foreach ($this->methodNames as $methodName) {
+            $docComment = $this->serviceClass->getMethod($methodName)->getDocComment();
+            $this->assertContains($methodName, $docComment);
+            $this->assertContains('@param \Foo\HelloRequest $request', $docComment);
+            $this->assertContains('@return \Foo\HelloReply', $docComment);
+        }
+    }
+
+    public function testPhpDocForServiceMethodInNamespacedClass()
+    {
+        foreach ($this->methodNames as $methodName) {
+            $docComment = $this->namespacedServiceClass->getMethod($methodName)->getDocComment();
+            $this->assertContains($methodName, $docComment);
+            $this->assertContains('@param \Foo\HelloRequest $request', $docComment);
+            $this->assertContains('@return \Foo\HelloReply', $docComment);
+        }
+    }
+
+    public function testParamForServiceMethod()
+    {
+        foreach ($this->methodNames as $methodName) {
+            $method = $this->serviceClass->getMethod($methodName);
+            $this->assertCount(1, $method->getParameters());
+            $param = $method->getParameters()[0];
+            $this->assertFalse($param->isOptional());
+            $this->assertSame('request', $param->getName());
+            // ReflectionParameter::getType only exists in PHP 7+, so get the type from __toString
+            $this->assertContains('Foo\HelloRequest $request', (string) $param);
+        }
+    }
+
+    public function testParamForServiceMethodInNamespacedClass()
+    {
+        foreach ($this->methodNames as $methodName) {
+            $method = $this->serviceClass->getMethod($methodName);
+            $this->assertCount(1, $method->getParameters());
+            $param = $method->getParameters()[0];
+            $this->assertFalse($param->isOptional());
+            $this->assertSame('request', $param->getName());
+            // ReflectionParameter::getType only exists in PHP 7+, so get the type from __toString
+            $this->assertContains('Foo\HelloRequest $request', (string) $param);
+        }
+    }
+}
diff --git a/php/tests/map_field_test.php b/php/tests/map_field_test.php
index d4ec44fc..447bdd9b 100644
--- a/php/tests/map_field_test.php
+++ b/php/tests/map_field_test.php
@@ -5,7 +5,7 @@ require_once('test_util.php');
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\MapField;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 
 class MapFieldTest extends PHPUnit_Framework_TestCase {
 
@@ -56,42 +56,23 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         unset($arr['3.1']);
         unset($arr[MAX_INT32_STRING]);
         $this->assertEquals(0, count($arr));
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetStringKeyFail()
-    {
-        $arr = new MapField(GPBType::INT32, GPBType::INT32);
-        $arr ['abc']= 0;
-    }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetStringValueFail()
-    {
+        // Test foreach.
         $arr = new MapField(GPBType::INT32, GPBType::INT32);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetMessageKeyFail()
-    {
-        $arr = new MapField(GPBType::INT32, GPBType::INT32);
-        $arr [new TestMessage_Sub()]= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt32SetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::INT32, GPBType::INT32);
-        $arr [0]= new TestMessage_Sub();
+        for ($i = 0; $i < 3; $i++) {
+          $arr[$i] = $i;
+        }
+        $i = 0;
+        $arr_test = [];
+        foreach ($arr as $key => $val) {
+          $this->assertSame($key, $val);
+          $arr_test[] = $key;
+          $i++;
+        }
+        $this->assertTrue(isset($arr_test[0]));
+        $this->assertTrue(isset($arr_test[1]));
+        $this->assertTrue(isset($arr_test[2]));
+        $this->assertSame(3, $i);
     }
 
     #########################################################
@@ -159,42 +140,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(0, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetStringKeyFail()
-    {
-        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
-        $arr ['abc']= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetStringValueFail()
-    {
-        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetMessageKeyFail()
-    {
-        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
-        $arr [new TestMessage_Sub()]= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint32SetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test int64 field.
     #########################################################
@@ -252,42 +197,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(0, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetStringKeyFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::INT64);
-        $arr ['abc']= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetStringValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::INT64);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetMessageKeyFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::INT64);
-        $arr [new TestMessage_Sub()]= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testInt64SetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::INT64);
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test uint64 field.
     #########################################################
@@ -339,42 +248,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(0, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetStringKeyFail()
-    {
-        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
-        $arr ['abc']= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetStringValueFail()
-    {
-        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetMessageKeyFail()
-    {
-        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
-        $arr [new TestMessage_Sub()]= 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testUint64SetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test float field.
     #########################################################
@@ -397,24 +270,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(4, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatSetStringValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::FLOAT);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testFloatSetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::FLOAT);
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test double field.
     #########################################################
@@ -437,24 +292,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(4, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleSetStringValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::DOUBLE);
-        $arr [0]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testDoubleSetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::INT64, GPBType::DOUBLE);
-        $arr [0]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test bool field.
     #########################################################
@@ -515,24 +352,6 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(0, count($arr));
     }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testBoolSetMessageKeyFail()
-    {
-        $arr = new MapField(GPBType::BOOL, GPBType::BOOL);
-        $arr [new TestMessage_Sub()]= true;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testBoolSetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::BOOL, GPBType::BOOL);
-        $arr [true]= new TestMessage_Sub();
-    }
-
     #########################################################
     # Test string field.
     #########################################################
@@ -564,42 +383,23 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
         $this->assertEquals(1, count($arr));
         unset($arr[True]);
         $this->assertEquals(0, count($arr));
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetInvalidUTF8KeyFail()
-    {
-        $arr = new MapField(GPBType::STRING, GPBType::STRING);
-        $arr[hex2bin("ff")]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetInvalidUTF8ValueFail()
-    {
-        $arr = new MapField(GPBType::STRING, GPBType::STRING);
-        $arr ['abc']= hex2bin("ff");
-    }
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetMessageKeyFail()
-    {
+        // Test foreach.
         $arr = new MapField(GPBType::STRING, GPBType::STRING);
-        $arr [new TestMessage_Sub()]= 'abc';
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testStringSetMessageValueFail()
-    {
-        $arr = new MapField(GPBType::STRING, GPBType::STRING);
-        $arr ['abc']= new TestMessage_Sub();
+        for ($i = 0; $i < 3; $i++) {
+          $arr[$i] = $i;
+        }
+        $i = 0;
+        $arr_test = [];
+        foreach ($arr as $key => $val) {
+          $this->assertSame($key, $val);
+          $arr_test[] = $key;
+          $i++;
+        }
+        $this->assertTrue(isset($arr_test['0']));
+        $this->assertTrue(isset($arr_test['1']));
+        $this->assertTrue(isset($arr_test['2']));
+        $this->assertSame(3, $i);
     }
 
     #########################################################
@@ -608,49 +408,38 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
 
     public function testMessage() {
         $arr = new MapField(GPBType::INT32,
-            GPBType::MESSAGE, TestMessage_Sub::class);
+            GPBType::MESSAGE, Sub::class);
 
         // Test append.
-        $sub_m = new TestMessage_Sub();
+        $sub_m = new Sub();
         $sub_m->setA(1);
         $arr[0] = $sub_m;
         $this->assertSame(1, $arr[0]->getA());
 
-        $null = NULL;
-        $arr[1] = $null;
-        $this->assertNull($arr[1]);
-
-        $this->assertEquals(2, count($arr));
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageSetIntValueFail()
-    {
-       $arr =
-           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
-       $arr[0] = 0;
-    }
-
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageSetStringValueFail()
-    {
-       $arr =
-           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
-       $arr[0] = 'abc';
-    }
+        $this->assertEquals(1, count($arr));
 
-    /**
-     * @expectedException PHPUnit_Framework_Error
-     */
-    public function testMessageSetOtherMessageValueFail()
-    {
-       $arr =
-           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
-       $arr[0] = new TestMessage_Sub();
+        // Test foreach.
+        $arr = new MapField(GPBType::INT32,
+            GPBType::MESSAGE, Sub::class);
+        for ($i = 0; $i < 3; $i++) {
+          $arr[$i] = new Sub();;
+          $arr[$i]->setA($i);
+        }
+        $i = 0;
+        $key_test = [];
+        $value_test = [];
+        foreach ($arr as $key => $val) {
+          $key_test[] = $key;
+          $value_test[] = $val->getA();
+          $i++;
+        }
+        $this->assertTrue(isset($key_test['0']));
+        $this->assertTrue(isset($key_test['1']));
+        $this->assertTrue(isset($key_test['2']));
+        $this->assertTrue(isset($value_test['0']));
+        $this->assertTrue(isset($value_test['1']));
+        $this->assertTrue(isset($value_test['2']));
+        $this->assertSame(3, $i);
     }
 
     #########################################################
@@ -662,7 +451,7 @@ class MapFieldTest extends PHPUnit_Framework_TestCase {
     // {
     //     $arr = new MapField(GPBType::INT32,
     //         GPBType::MESSAGE, TestMessage::class);
-    //     $arr [0]= new TestMessage;
+    //     $arr[0] = new TestMessage;
     //     $arr[0]->SetMapRecursive($arr);
 
     //     // Clean up memory before test.
diff --git a/php/tests/memory_leak_test.php b/php/tests/memory_leak_test.php
index cfcbe62e..4e3874b7 100644
--- a/php/tests/memory_leak_test.php
+++ b/php/tests/memory_leak_test.php
@@ -2,21 +2,55 @@
 
 # phpunit has memory leak by itself. Thus, it cannot be used to test memory leak.
 
+require_once('generated/NoNamespaceEnum.php');
+require_once('generated/NoNamespaceMessage.php');
+require_once('generated/NoNamespaceMessage/NestedEnum.php');
+require_once('generated/NoNamespaceMessage/NestedMessage.php');
+require_once('generated/PrefixEmpty.php');
+require_once('generated/PrefixTestPrefix.php');
+require_once('generated/PrefixTestPrefix/PrefixNestedEnum.php');
+require_once('generated/PrefixTestPrefix/PrefixNestedMessage.php');
+require_once('generated/TestEmptyNamespace.php');
+require_once('generated/TestEmptyNamespace/NestedEnum.php');
+require_once('generated/TestEmptyNamespace/NestedMessage.php');
 require_once('generated/Bar/TestInclude.php');
+require_once('generated/Bar/TestLegacyMessage.php');
+require_once('generated/Bar/TestLegacyMessage/NestedEnum.php');
+require_once('generated/Bar/TestLegacyMessage/NestedMessage.php');
+require_once('generated/Foo/PBARRAY.php');
+require_once('generated/Foo/PBEmpty.php');
 require_once('generated/Foo/TestEnum.php');
+require_once('generated/Foo/TestIncludeNamespaceMessage.php');
+require_once('generated/Foo/TestIncludePrefixMessage.php');
 require_once('generated/Foo/TestMessage.php');
-require_once('generated/Foo/TestMessage_Sub.php');
+require_once('generated/Foo/TestMessage/PBEmpty.php');
+require_once('generated/Foo/TestMessage/NestedEnum.php');
+require_once('generated/Foo/TestMessage/Sub.php');
 require_once('generated/Foo/TestPackedMessage.php');
 require_once('generated/Foo/TestPhpDoc.php');
+require_once('generated/Foo/TestRandomFieldOrder.php');
+require_once('generated/Foo/TestReverseFieldOrder.php');
 require_once('generated/Foo/TestUnpackedMessage.php');
+require_once('generated/Foo/testLowerCaseMessage.php');
+require_once('generated/Foo/testLowerCaseEnum.php');
 require_once('generated/GPBMetadata/Proto/Test.php');
+require_once('generated/TestEmptyPhpNamespace.php');
 require_once('generated/GPBMetadata/Proto/TestInclude.php');
+require_once('generated/TestNoNamespace.php');
+require_once('generated/Metadata/Php/Test/TestPhpNamespace.php');
+require_once('generated/GPBMetadata/Proto/TestPrefix.php');
+require_once('generated/Php/Test/TestNamespace.php');
+require_once('generated/Php/Test/TestNamespace/PBEmpty.php');
+require_once('generated/Php/Test/TestNamespace/PBEmpty/NestedEnum.php');
+require_once('generated/Php/Test/TestNamespace/PBEmpty/NestedMessage.php');
+require_once('generated/Php/Test/TestNamespace/NestedEnum.php');
+require_once('generated/Php/Test/TestNamespace/NestedMessage.php');
 require_once('test_util.php');
 
 use Google\Protobuf\Internal\RepeatedField;
 use Google\Protobuf\Internal\GPBType;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 
 $from = new TestMessage();
 TestUtil::setTestMessage($from);
@@ -29,10 +63,18 @@ $to->mergeFromString($data);
 
 TestUtil::assertTestMessage($to);
 
-$from->setRecursive($from);
+$from = new TestMessage();
+TestUtil::setTestMessage2($from);
+
+$data = $from->serializeToString();
+
+$to->mergeFromString($data);
+
+// TODO(teboring): This causes following tests fail in php7.
+# $from->setRecursive($from);
 
 $arr = new RepeatedField(GPBType::MESSAGE, TestMessage::class);
-$arr []= new TestMessage;
+$arr[] = new TestMessage;
 $arr[0]->SetRepeatedRecursive($arr);
 
 // Test oneof fields.
@@ -68,7 +110,7 @@ $n = new TestMessage();
 $n->mergeFromString($data);
 assert('abc' === $n->getOneofString());
 
-$sub_m = new TestMessage_Sub();
+$sub_m = new Sub();
 $sub_m->setA(1);
 $m->setOneofMessage($sub_m);
 assert(0 === $m->getOneofInt32());
@@ -80,7 +122,72 @@ $n = new TestMessage();
 $n->mergeFromString($data);
 assert(1 === $n->getOneofMessage()->getA());
 
+$m = new TestMessage();
+$m->mergeFromString(hex2bin('F80601'));
+assert('f80601' === bin2hex($m->serializeToString()));
+
+// Test create repeated field via array.
+$str_arr = array("abc");
+$m = new TestMessage();
+$m->setRepeatedString($str_arr);
+
+// Test create map field via array.
+$str_arr = array("abc"=>"abc");
+$m = new TestMessage();
+$m->setMapStringString($str_arr);
+
+// Test unset
+$from = new TestMessage();
+TestUtil::setTestMessage($from);
+unset($from);
+
+// Test wellknown
+$from = new \Google\Protobuf\Timestamp();
+$from->setSeconds(1);
+assert(1, $from->getSeconds());
+
+$timestamp = new \Google\Protobuf\Timestamp();
+
+date_default_timezone_set('UTC');
+$from = new DateTime('2011-01-01T15:03:01.012345UTC');
+$timestamp->fromDateTime($from);
+assert($from->format('U') == $timestamp->getSeconds());
+assert(0 == $timestamp->getNanos());
+
+$to = $timestamp->toDateTime();
+assert(\DateTime::class == get_class($to));
+assert($from->format('U') == $to->format('U'));
+
+$from = new \Google\Protobuf\Value();
+$from->setNumberValue(1);
+assert(1, $from->getNumberValue());
+
+// Test discard unknown in message.
+$m = new TestMessage();
+$from = hex2bin('F80601');
+$m->mergeFromString($from);
+$m->discardUnknownFields();
+$to = $m->serializeToString();
+assert("" === bin2hex($to));
+
+// Test clear
+$m = new TestMessage();
+TestUtil::setTestMessage($m);
+$m->clear();
+
+// Test unset map element
+$m = new TestMessage();
+$map = $m->getMapStringString();
+$map[1] = 1;
+unset($map[1]);
+
+// Test descriptor
+$pool = \Google\Protobuf\DescriptorPool::getGeneratedPool();
+$desc = $pool->getDescriptorByClassName("\Foo\TestMessage");
+$field = $desc->getField(1);
+
 $from = new TestMessage();
 $to = new TestMessage();
 TestUtil::setTestMessage($from);
 $to->mergeFrom($from);
+TestUtil::assertTestMessage($to);
diff --git a/php/tests/php_implementation_test.php b/php/tests/php_implementation_test.php
index ec6b8d5a..323a36ff 100644
--- a/php/tests/php_implementation_test.php
+++ b/php/tests/php_implementation_test.php
@@ -3,35 +3,35 @@
 require_once('test_base.php');
 require_once('test_util.php');
 
+use Foo\TestEnum;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 use Foo\TestPackedMessage;
-use Google\Protobuf\Internal\InputStream;
+use Google\Protobuf\Internal\CodedInputStream;
 use Google\Protobuf\Internal\FileDescriptorSet;
 use Google\Protobuf\Internal\GPBLabel;
 use Google\Protobuf\Internal\GPBType;
 use Google\Protobuf\Internal\GPBWire;
-use Google\Protobuf\Internal\OutputStream;
+use Google\Protobuf\Internal\CodedOutputStream;
 
 class ImplementationTest extends TestBase
 {
-
     public function testReadInt32()
     {
         $value = null;
 
         // Positive number.
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readInt32($input, $value);
         $this->assertSame(1, $value);
 
         // Negative number.
-        $input = new InputStream(hex2bin("ffffffff0f"));
+        $input = new CodedInputStream(hex2bin("ffffffff0f"));
         GPBWire::readInt32($input, $value);
         $this->assertSame(-1, $value);
 
         // Discard overflow bits.
-        $input = new InputStream(hex2bin("ffffffff7f"));
+        $input = new CodedInputStream(hex2bin("ffffffff7f"));
         GPBWire::readInt32($input, $value);
         $this->assertSame(-1, $value);
     }
@@ -41,17 +41,17 @@ class ImplementationTest extends TestBase
         $value = null;
 
         // Positive number.
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readUint32($input, $value);
         $this->assertSame(1, $value);
 
         // Max uint32.
-        $input = new InputStream(hex2bin("ffffffff0f"));
+        $input = new CodedInputStream(hex2bin("ffffffff0f"));
         GPBWire::readUint32($input, $value);
         $this->assertSame(-1, $value);
 
         // Discard overflow bits.
-        $input = new InputStream(hex2bin("ffffffff7f"));
+        $input = new CodedInputStream(hex2bin("ffffffff7f"));
         GPBWire::readUint32($input, $value);
         $this->assertSame(-1, $value);
     }
@@ -61,17 +61,17 @@ class ImplementationTest extends TestBase
         $value = null;
 
         // Positive number.
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readInt64($input, $value);
         $this->assertEquals(1, $value);
 
         // Negative number.
-        $input = new InputStream(hex2bin("ffffffffffffffffff01"));
+        $input = new CodedInputStream(hex2bin("ffffffffffffffffff01"));
         GPBWire::readInt64($input, $value);
         $this->assertEquals(-1, $value);
 
         // Discard overflow bits.
-        $input = new InputStream(hex2bin("ffffffffffffffffff0f"));
+        $input = new CodedInputStream(hex2bin("ffffffffffffffffff0f"));
         GPBWire::readInt64($input, $value);
         $this->assertEquals(-1, $value);
     }
@@ -81,17 +81,17 @@ class ImplementationTest extends TestBase
         $value = null;
 
         // Positive number.
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readUint64($input, $value);
         $this->assertEquals(1, $value);
 
         // Negative number.
-        $input = new InputStream(hex2bin("FFFFFFFFFFFFFFFFFF01"));
+        $input = new CodedInputStream(hex2bin("FFFFFFFFFFFFFFFFFF01"));
         GPBWire::readUint64($input, $value);
         $this->assertEquals(-1, $value);
 
         // Discard overflow bits.
-        $input = new InputStream(hex2bin("FFFFFFFFFFFFFFFFFF0F"));
+        $input = new CodedInputStream(hex2bin("FFFFFFFFFFFFFFFFFF0F"));
         GPBWire::readUint64($input, $value);
         $this->assertEquals(-1, $value);
     }
@@ -100,15 +100,15 @@ class ImplementationTest extends TestBase
     {
         $value = null;
 
-        $input = new InputStream(hex2bin("00"));
+        $input = new CodedInputStream(hex2bin("00"));
         GPBWire::readSint32($input, $value);
         $this->assertSame(0, $value);
 
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readSint32($input, $value);
         $this->assertSame(-1, $value);
 
-        $input = new InputStream(hex2bin("02"));
+        $input = new CodedInputStream(hex2bin("02"));
         GPBWire::readSint32($input, $value);
         $this->assertSame(1, $value);
     }
@@ -117,15 +117,15 @@ class ImplementationTest extends TestBase
     {
         $value = null;
 
-        $input = new InputStream(hex2bin("00"));
+        $input = new CodedInputStream(hex2bin("00"));
         GPBWire::readSint64($input, $value);
         $this->assertEquals(0, $value);
 
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readSint64($input, $value);
         $this->assertEquals(-1, $value);
 
-        $input = new InputStream(hex2bin("02"));
+        $input = new CodedInputStream(hex2bin("02"));
         GPBWire::readSint64($input, $value);
         $this->assertEquals(1, $value);
     }
@@ -133,7 +133,7 @@ class ImplementationTest extends TestBase
     public function testReadFixed32()
     {
         $value = null;
-        $input = new InputStream(hex2bin("12345678"));
+        $input = new CodedInputStream(hex2bin("12345678"));
         GPBWire::readFixed32($input, $value);
         $this->assertSame(0x78563412, $value);
     }
@@ -141,7 +141,7 @@ class ImplementationTest extends TestBase
     public function testReadFixed64()
     {
         $value = null;
-        $input = new InputStream(hex2bin("1234567812345678"));
+        $input = new CodedInputStream(hex2bin("1234567812345678"));
         GPBWire::readFixed64($input, $value);
         if (PHP_INT_SIZE == 4) {
             $this->assertSame("8671175386481439762", $value);
@@ -153,7 +153,7 @@ class ImplementationTest extends TestBase
     public function testReadSfixed32()
     {
         $value = null;
-        $input = new InputStream(hex2bin("12345678"));
+        $input = new CodedInputStream(hex2bin("12345678"));
         GPBWire::readSfixed32($input, $value);
         $this->assertSame(0x78563412, $value);
     }
@@ -161,7 +161,7 @@ class ImplementationTest extends TestBase
     public function testReadFloat()
     {
         $value = null;
-        $input = new InputStream(hex2bin("0000803F"));
+        $input = new CodedInputStream(hex2bin("0000803F"));
         GPBWire::readFloat($input, $value);
         $this->assertSame(1.0, $value);
     }
@@ -170,11 +170,11 @@ class ImplementationTest extends TestBase
     {
         $value = null;
 
-        $input = new InputStream(hex2bin("00"));
+        $input = new CodedInputStream(hex2bin("00"));
         GPBWire::readBool($input, $value);
         $this->assertSame(false, $value);
 
-        $input = new InputStream(hex2bin("01"));
+        $input = new CodedInputStream(hex2bin("01"));
         GPBWire::readBool($input, $value);
         $this->assertSame(true, $value);
     }
@@ -182,7 +182,7 @@ class ImplementationTest extends TestBase
     public function testReadDouble()
     {
         $value = null;
-        $input = new InputStream(hex2bin("000000000000F03F"));
+        $input = new CodedInputStream(hex2bin("000000000000F03F"));
         GPBWire::readDouble($input, $value);
         $this->assertSame(1.0, $value);
     }
@@ -190,7 +190,7 @@ class ImplementationTest extends TestBase
     public function testReadSfixed64()
     {
         $value = null;
-        $input = new InputStream(hex2bin("1234567812345678"));
+        $input = new CodedInputStream(hex2bin("1234567812345678"));
         GPBWire::readSfixed64($input, $value);
         if (PHP_INT_SIZE == 4) {
             $this->assertSame("8671175386481439762", $value);
@@ -207,8 +207,7 @@ class ImplementationTest extends TestBase
         $this->assertSame(3, GPBWire::zigZagEncode32(-2));
         $this->assertSame(0x7FFFFFFE, GPBWire::zigZagEncode32(0x3FFFFFFF));
         $this->assertSame(0x7FFFFFFF, GPBWire::zigZagEncode32(0xC0000000));
-        $this->assertSame(-2, GPBWire::zigZagEncode32(0x7FFFFFFF));
-        $this->assertSame(-1, GPBWire::zigZagEncode32(0x80000000));
+        $this->assertSame(0x7FFFFFFF, GPBWire::zigZagEncode32(-1073741824));
 
         $this->assertSame(0,  GPBWire::zigZagDecode32(0));
         $this->assertSame(-1, GPBWire::zigZagDecode32(1));
@@ -220,6 +219,8 @@ class ImplementationTest extends TestBase
         $this->assertSame((int)-2147483648,GPBWire::zigZagDecode32(0xFFFFFFFF));
 
         if (PHP_INT_SIZE == 4) {
+            $this->assertSame(-2, GPBWire::zigZagEncode32(0x7FFFFFFF));
+            $this->assertSame(-1, GPBWire::zigZagEncode32(0x80000000));
             $this->assertSame('0', GPBWire::zigZagEncode64(0));
             $this->assertSame('1', GPBWire::zigZagEncode64(-1));
             $this->assertSame('2', GPBWire::zigZagEncode64(1));
@@ -250,6 +251,8 @@ class ImplementationTest extends TestBase
             $this->assertSame('1', GPBWire::zigZagDecode64(2));
             $this->assertSame('-2', GPBWire::zigZagDecode64(3));
         } else {
+            $this->assertSame(4294967294, GPBWire::zigZagEncode32(0x7FFFFFFF));
+            $this->assertSame(4294967295, GPBWire::zigZagEncode32(0x80000000));
             $this->assertSame(0, GPBWire::zigZagEncode64(0));
             $this->assertSame(1, GPBWire::zigZagEncode64(-1));
             $this->assertSame(2, GPBWire::zigZagEncode64(1));
@@ -330,19 +333,19 @@ class ImplementationTest extends TestBase
         $var = 0;
 
         // Empty buffer.
-        $input = new InputStream(hex2bin(''));
+        $input = new CodedInputStream(hex2bin(''));
         $this->assertFalse($input->readVarint64($var));
 
         // The largest varint is 10 bytes long.
-        $input = new InputStream(hex2bin('8080808080808080808001'));
+        $input = new CodedInputStream(hex2bin('8080808080808080808001'));
         $this->assertFalse($input->readVarint64($var));
 
         // Corrupted varint.
-        $input = new InputStream(hex2bin('808080'));
+        $input = new CodedInputStream(hex2bin('808080'));
         $this->assertFalse($input->readVarint64($var));
 
         // Normal case.
-        $input = new InputStream(hex2bin('808001'));
+        $input = new CodedInputStream(hex2bin('808001'));
         $this->assertTrue($input->readVarint64($var));
         if (PHP_INT_SIZE == 4) {
             $this->assertSame('16384', $var);
@@ -352,7 +355,7 @@ class ImplementationTest extends TestBase
         $this->assertFalse($input->readVarint64($var));
 
         // Read two varint.
-        $input = new InputStream(hex2bin('808001808002'));
+        $input = new CodedInputStream(hex2bin('808001808002'));
         $this->assertTrue($input->readVarint64($var));
         if (PHP_INT_SIZE == 4) {
             $this->assertSame('16384', $var);
@@ -390,7 +393,7 @@ class ImplementationTest extends TestBase
         );
 
         foreach ($testVals as $original => $encoded) {
-            $input = new InputStream(hex2bin($encoded));
+            $input = new CodedInputStream(hex2bin($encoded));
             $this->assertTrue($input->readVarint64($var));
             $this->assertEquals($original, $var);
         }
@@ -401,25 +404,25 @@ class ImplementationTest extends TestBase
         $var = 0;
 
         // Empty buffer.
-        $input = new InputStream(hex2bin(''));
+        $input = new CodedInputStream(hex2bin(''));
         $this->assertFalse($input->readVarint32($var));
 
         // The largest varint is 10 bytes long.
-        $input = new InputStream(hex2bin('8080808080808080808001'));
+        $input = new CodedInputStream(hex2bin('8080808080808080808001'));
         $this->assertFalse($input->readVarint32($var));
 
         // Corrupted varint.
-        $input = new InputStream(hex2bin('808080'));
+        $input = new CodedInputStream(hex2bin('808080'));
         $this->assertFalse($input->readVarint32($var));
 
         // Normal case.
-        $input = new InputStream(hex2bin('808001'));
+        $input = new CodedInputStream(hex2bin('808001'));
         $this->assertTrue($input->readVarint32($var));
         $this->assertSame(16384, $var);
         $this->assertFalse($input->readVarint32($var));
 
         // Read two varint.
-        $input = new InputStream(hex2bin('808001808002'));
+        $input = new CodedInputStream(hex2bin('808001808002'));
         $this->assertTrue($input->readVarint32($var));
         $this->assertSame(16384, $var);
         $this->assertTrue($input->readVarint32($var));
@@ -427,7 +430,7 @@ class ImplementationTest extends TestBase
         $this->assertFalse($input->readVarint32($var));
 
         // Read a 64-bit integer. High-order bits should be discarded.
-        $input = new InputStream(hex2bin('808081808001'));
+        $input = new CodedInputStream(hex2bin('808081808001'));
         $this->assertTrue($input->readVarint32($var));
         $this->assertSame(16384, $var);
         $this->assertFalse($input->readVarint32($var));
@@ -435,7 +438,7 @@ class ImplementationTest extends TestBase
 
     public function testReadTag()
     {
-        $input = new InputStream(hex2bin('808001'));
+        $input = new CodedInputStream(hex2bin('808001'));
         $tag = $input->readTag();
         $this->assertSame(16384, $tag);
         $tag = $input->readTag();
@@ -444,7 +447,7 @@ class ImplementationTest extends TestBase
 
     public function testPushPopLimit()
     {
-        $input = new InputStream(hex2bin('808001'));
+        $input = new CodedInputStream(hex2bin('808001'));
         $old_limit = $input->pushLimit(0);
         $tag = $input->readTag();
         $this->assertSame(0, $tag);
@@ -455,7 +458,7 @@ class ImplementationTest extends TestBase
 
     public function testReadRaw()
     {
-        $input = new InputStream(hex2bin('808001'));
+        $input = new CodedInputStream(hex2bin('808001'));
         $buffer = null;
 
         $this->assertTrue($input->readRaw(3, $buffer));
@@ -466,28 +469,33 @@ class ImplementationTest extends TestBase
 
     public function testWriteVarint32()
     {
-        $output = new OutputStream(3);
-        $output->writeVarint32(16384);
+        $output = new CodedOutputStream(3);
+        $output->writeVarint32(16384, true);
         $this->assertSame(hex2bin('808001'), $output->getData());
+
+        // Negative numbers are padded to be compatible with int64.
+        $output = new CodedOutputStream(10);
+        $output->writeVarint32(-43, false);
+        $this->assertSame(hex2bin('D5FFFFFFFFFFFFFFFF01'), $output->getData());
     }
 
     public function testWriteVarint64()
     {
-        $output = new OutputStream(10);
+        $output = new CodedOutputStream(10);
         $output->writeVarint64(-43);
         $this->assertSame(hex2bin('D5FFFFFFFFFFFFFFFF01'), $output->getData());
     }
 
     public function testWriteLittleEndian32()
     {
-        $output = new OutputStream(4);
+        $output = new CodedOutputStream(4);
         $output->writeLittleEndian32(46);
         $this->assertSame(hex2bin('2E000000'), $output->getData());
     }
 
     public function testWriteLittleEndian64()
     {
-        $output = new OutputStream(8);
+        $output = new CodedOutputStream(8);
         $output->writeLittleEndian64(47);
         $this->assertSame(hex2bin('2F00000000000000'), $output->getData());
     }
@@ -496,13 +504,84 @@ class ImplementationTest extends TestBase
     {
         $m = new TestMessage();
         TestUtil::setTestMessage($m);
-        $this->assertSame(481, $m->byteSize());
+        $this->assertSame(506, $m->byteSize());
     }
 
     public function testPackedByteSize()
     {
         $m = new TestPackedMessage();
         TestUtil::setTestPackedMessage($m);
-        $this->assertSame(156, $m->byteSize());
+        $this->assertSame(166, $m->byteSize());
+    }
+
+    /**
+     * @expectedException UnexpectedValueException
+     * @expectedExceptionMessage Invalid message property: optionalInt32
+     */
+    public function testArrayConstructorJsonCaseThrowsException()
+    {
+        $m = new TestMessage([
+            'optionalInt32' => -42,
+        ]);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Expect Foo\TestMessage_Sub.
+     */
+    public function testArraysForMessagesThrowsException()
+    {
+        $m = new TestMessage([
+            'optional_message' => [
+                'a' => 33
+            ]
+        ]);
+    }
+
+    public function testArrayConstructorWithNullValues()
+    {
+        $requestData = [
+            'optional_bool' => null,
+            'optional_string' => null,
+            'optional_bytes' => null,
+            'optional_message' => null,
+        ];
+
+        $m = new TestMessage($requestData);
+
+        $this->assertSame(false, $m->getOptionalBool());
+        $this->assertSame('', $m->getOptionalString());
+        $this->assertSame('', $m->getOptionalBytes());
+        $this->assertSame(null, $m->getOptionalMessage());
+    }
+
+    /**
+     * @dataProvider provideArrayConstructorWithNullValuesThrowsException
+     * @expectedException Exception
+     */
+    public function testArrayConstructorWithNullValuesThrowsException($requestData)
+    {
+        $m = new TestMessage($requestData);
+    }
+
+    public function provideArrayConstructorWithNullValuesThrowsException()
+    {
+        return [
+            [['optional_int32' => null]],
+            [['optional_int64' => null]],
+            [['optional_uint32' => null]],
+            [['optional_uint64' => null]],
+            [['optional_sint32' => null]],
+            [['optional_sint64' => null]],
+            [['optional_fixed32' => null]],
+            [['optional_fixed64' => null]],
+            [['optional_sfixed32' => null]],
+            [['optional_sfixed64' => null]],
+            [['optional_float' => null]],
+            [['optional_double' => null]],
+            [['optional_enum' => null]],
+            [['repeated_int32' => null]],
+            [['map_int32_int32' => null]],
+        ];
     }
 }
diff --git a/php/tests/proto/empty/echo.proto b/php/tests/proto/empty/echo.proto
new file mode 100644
index 00000000..1817018d
--- /dev/null
+++ b/php/tests/proto/empty/echo.proto
@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+package empty.echo;
+
+message TestEmptyPackage {
+  int32 a = 1;
+
+  // Test nested messages, enums, and reserved names
+  NestedMessage nested_message = 2;
+  NestedEnum nested_enum = 3;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+      ZERO = 0;
+  };
+}
diff --git a/php/tests/proto/test.proto b/php/tests/proto/test.proto
index e5dee0fb..d0109d83 100644
--- a/php/tests/proto/test.proto
+++ b/php/tests/proto/test.proto
@@ -1,6 +1,10 @@
 syntax = "proto3";
 
 import 'proto/test_include.proto';
+import 'proto/test_no_namespace.proto';
+import 'proto/test_php_namespace.proto';
+import 'proto/test_empty_php_namespace.proto';
+import 'proto/test_prefix.proto';
 
 package foo;
 
@@ -95,12 +99,40 @@ message TestMessage {
 
   // Reserved for non-existing field test.
   // int32 non_exist = 89;
+
+  NoNamespaceMessage optional_no_namespace_message = 91;
+  NoNamespaceEnum optional_no_namespace_enum = 92;
+  repeated NoNamespaceMessage repeated_no_namespace_message = 93;
+  repeated NoNamespaceEnum repeated_no_namespace_enum = 94;
+
+  enum NestedEnum {
+    ZERO = 0;
+  }
+
+  NestedEnum optional_nested_enum = 101;
+
+  // Test prefix for reserved words.
+  message Empty {
+    int32 a = 1;
+  }
+
+  reserved 111;
 }
 
 enum TestEnum {
   ZERO = 0;
   ONE  = 1;
   TWO  = 2;
+  ECHO = 3;  // Test reserved name.
+}
+
+// Test prefix for reserved words.
+message Empty {
+  int32 a = 1;
+}
+
+message ARRAY {
+  int32 a = 1;
 }
 
 message TestPackedMessage {
@@ -142,3 +174,30 @@ message TestUnpackedMessage {
 message TestPhpDoc {
   int32 a = 1;
 }
+
+message TestIncludePrefixMessage {
+  TestPrefix prefix_message = 1;
+}
+
+message TestIncludeNamespaceMessage {
+  TestNamespace namespace_message = 1;
+  TestEmptyNamespace empty_namespace_message = 2;
+}
+
+// This will cause upb fields not ordered by the order in the generated code.
+message TestRandomFieldOrder {
+  int64 tag13 = 150;
+  string tag14 = 160;
+}
+
+message TestReverseFieldOrder {
+  repeated int32 a = 2;
+  string b = 1;
+}
+
+message testLowerCaseMessage {
+}
+
+enum testLowerCaseEnum {
+  VALUE = 0;
+}
diff --git a/php/tests/proto/test_descriptors.proto b/php/tests/proto/test_descriptors.proto
new file mode 100644
index 00000000..d42aec7c
--- /dev/null
+++ b/php/tests/proto/test_descriptors.proto
@@ -0,0 +1,35 @@
+syntax = "proto3";
+
+package descriptors;
+
+message TestDescriptorsMessage {
+  int32 optional_int32 = 1;
+  TestDescriptorsEnum optional_enum = 16;
+  Sub optional_message = 17;
+
+  // Repeated
+  repeated int32 repeated_int32 = 31;
+  repeated Sub repeated_message = 47;
+
+  oneof my_oneof {
+    int32 oneof_int32    = 51;
+  }
+
+  map<int32, EnumSub> map_int32_enum = 71;
+
+  message Sub {
+    int32 a = 1;
+    repeated int32 b = 2;
+  }
+
+  enum EnumSub {
+    ZERO = 0;
+    ONE = 1;
+  }
+}
+
+enum TestDescriptorsEnum {
+  ZERO = 0;
+  ONE  = 1;
+}
+
diff --git a/php/tests/proto/test_empty_php_namespace.proto b/php/tests/proto/test_empty_php_namespace.proto
new file mode 100644
index 00000000..c7ed1657
--- /dev/null
+++ b/php/tests/proto/test_empty_php_namespace.proto
@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+package foo;
+option php_namespace = "";
+option php_metadata_namespace = "";
+
+message TestEmptyNamespace {
+  int32 a = 1;
+
+  // Test nested messages, enums, and reserved names
+  NestedMessage nested_message = 2;
+  NestedEnum nested_enum = 3;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+      ZERO = 0;
+  };
+}
diff --git a/php/tests/proto/test_import_descriptor_proto.proto b/php/tests/proto/test_import_descriptor_proto.proto
new file mode 100644
index 00000000..2a19940d
--- /dev/null
+++ b/php/tests/proto/test_import_descriptor_proto.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+
+import "google/protobuf/descriptor.proto";
+
+message TestImportDescriptorProto {
+  extend google.protobuf.MethodOptions {
+    int32 a = 72295727;
+  }
+}
+
+extend google.protobuf.MethodOptions {
+  int32 a = 72295728;
+}
+
diff --git a/php/tests/proto/test_include.proto b/php/tests/proto/test_include.proto
index 9844617f..a9072fe3 100644
--- a/php/tests/proto/test_include.proto
+++ b/php/tests/proto/test_include.proto
@@ -5,3 +5,14 @@ package bar;
 message TestInclude {
   int32 a = 1;
 }
+
+message TestLegacyMessage {
+  NestedMessage message = 1;
+  NestedEnum enum = 2;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+    ZERO = 0;
+  }
+}
diff --git a/php/tests/proto/test_no_namespace.proto b/php/tests/proto/test_no_namespace.proto
index b8c4fdf2..cce42ea2 100644
--- a/php/tests/proto/test_no_namespace.proto
+++ b/php/tests/proto/test_no_namespace.proto
@@ -1,10 +1,22 @@
 syntax = "proto3";
 
-message NoNameSpaceMessage {
+option php_metadata_namespace = "\\";
+
+message NoNamespaceMessage {
   int32 a = 1;
+
+  // Test nested messages, enums, and reserved names
+  NestedMessage nested_message = 2;
+  NestedEnum nested_enum = 3;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+      ZERO = 0;
+  };
 }
 
-enum NoNameSpaceEnum {
+enum NoNamespaceEnum {
   VALUE_A = 0;
   VALUE_B = 1;
 }
diff --git a/php/tests/proto/test_php_namespace.proto b/php/tests/proto/test_php_namespace.proto
new file mode 100644
index 00000000..61085bf7
--- /dev/null
+++ b/php/tests/proto/test_php_namespace.proto
@@ -0,0 +1,31 @@
+syntax = "proto3";
+
+package foo;
+option php_namespace = "Php\\Test";
+option php_metadata_namespace = "Metadata\\Php\\Test";
+
+message TestNamespace {
+  int32 a = 1;
+
+  // Test nested messages, enums, and reserved names
+  NestedMessage nested_message = 2;
+  NestedEnum nested_enum = 3;
+  Empty reserved_name = 4;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+      ZERO = 0;
+  };
+  // Test reserved name
+  message Empty {
+    NestedMessage nested_message = 1;
+    NestedEnum nested_enum = 2;
+    message NestedMessage {
+      int32 a = 1;
+    }
+    enum NestedEnum {
+      ZERO = 0;
+    };
+  }
+}
diff --git a/php/tests/proto/test_prefix.proto b/php/tests/proto/test_prefix.proto
new file mode 100644
index 00000000..3fa11381
--- /dev/null
+++ b/php/tests/proto/test_prefix.proto
@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+option php_class_prefix = "Prefix";
+
+message TestPrefix {
+  int32 a = 1;
+  NestedMessage nested_message = 2;
+  NestedEnum nested_enum = 3;
+  message NestedMessage {
+    int32 a = 1;
+  }
+  enum NestedEnum {
+      ZERO = 0;
+  };
+}
+
+// Test prefix for reserved words.
+message Empty {
+  int32 a = 1;
+}
diff --git a/php/tests/proto/test_reserved_enum_lower.proto b/php/tests/proto/test_reserved_enum_lower.proto
new file mode 100644
index 00000000..d2daeaff
--- /dev/null
+++ b/php/tests/proto/test_reserved_enum_lower.proto
@@ -0,0 +1,77 @@
+syntax = "proto3";
+
+package lower_enum;
+
+enum abstract { ZERO1 = 0; }
+enum and { ZERO2 = 0; }
+enum array { ZERO3 = 0; }
+enum as { ZERO4 = 0; }
+enum break { ZERO5 = 0; }
+enum callable { ZERO6 = 0; }
+enum case { ZERO7 = 0; }
+enum catch { ZERO8 = 0; }
+enum class { ZERO9 = 0; }
+enum clone { ZERO10 = 0; }
+enum const { ZERO11 = 0; }
+enum continue { ZERO12 = 0; }
+enum declare { ZERO13 = 0; }
+enum default { ZERO14 = 0; }
+enum die { ZERO15 = 0; }
+enum do { ZERO16 = 0; }
+enum echo { ZERO17 = 0; }
+enum else { ZERO18 = 0; }
+enum elseif { ZERO19 = 0; }
+enum empty { ZERO20 = 0; }
+enum enddeclare { ZERO21 = 0; }
+enum endfor { ZERO22 = 0; }
+enum endforeach { ZERO23 = 0; }
+enum endif { ZERO24 = 0; }
+enum endswitch { ZERO25 = 0; }
+enum endwhile { ZERO26 = 0; }
+enum eval { ZERO27 = 0; }
+enum exit { ZERO28 = 0; }
+enum extends { ZERO29 = 0; }
+enum final { ZERO30 = 0; }
+enum for { ZERO31 = 0; }
+enum foreach { ZERO32 = 0; }
+enum function { ZERO33 = 0; }
+enum global { ZERO34 = 0; }
+enum goto { ZERO35 = 0; }
+enum if { ZERO36 = 0; }
+enum implements { ZERO37 = 0; }
+enum include { ZERO38 = 0; }
+enum include_once { ZERO39 = 0; }
+enum instanceof { ZERO40 = 0; }
+enum insteadof { ZERO41 = 0; }
+enum interface { ZERO42 = 0; }
+enum isset { ZERO43 = 0; }
+enum list { ZERO44 = 0; }
+enum namespace { ZERO45 = 0; }
+enum new { ZERO46 = 0; }
+enum or { ZERO47 = 0; }
+enum print { ZERO48 = 0; }
+enum private { ZERO49 = 0; }
+enum protected { ZERO50 = 0; }
+enum public { ZERO51 = 0; }
+enum require { ZERO52 = 0; }
+enum require_once { ZERO53 = 0; }
+enum return { ZERO54 = 0; }
+enum static { ZERO55 = 0; }
+enum switch { ZERO56 = 0; }
+enum throw { ZERO57 = 0; }
+enum trait { ZERO58 = 0; }
+enum try { ZERO59 = 0; }
+enum unset { ZERO60 = 0; }
+enum use { ZERO61 = 0; }
+enum var { ZERO62 = 0; }
+enum while { ZERO63 = 0; }
+enum xor { ZERO64 = 0; }
+enum int { ZERO65 = 0; }
+enum float { ZERO66 = 0; }
+enum bool { ZERO67 = 0; }
+enum string { ZERO68 = 0; }
+enum true { ZERO69 = 0; }
+enum false { ZERO70 = 0; }
+enum null { ZERO71 = 0; }
+enum void { ZERO72 = 0; }
+enum iterable { ZERO73 = 0; }
diff --git a/php/tests/proto/test_reserved_enum_upper.proto b/php/tests/proto/test_reserved_enum_upper.proto
new file mode 100644
index 00000000..a396fea3
--- /dev/null
+++ b/php/tests/proto/test_reserved_enum_upper.proto
@@ -0,0 +1,77 @@
+syntax = "proto3";
+
+package upper_enum;
+
+enum ABSTRACT { ZERO1 = 0; }
+enum AND { ZERO2 = 0; }
+enum ARRAY { ZERO3 = 0; }
+enum AS { ZERO4 = 0; }
+enum BREAK { ZERO5 = 0; }
+enum CALLABLE { ZERO6 = 0; }
+enum CASE { ZERO7 = 0; }
+enum CATCH { ZERO8 = 0; }
+enum CLASS { ZERO9 = 0; }
+enum CLONE { ZERO10 = 0; }
+enum CONST { ZERO11 = 0; }
+enum CONTINUE { ZERO12 = 0; }
+enum DECLARE { ZERO13 = 0; }
+enum DEFAULT { ZERO14 = 0; }
+enum DIE { ZERO15 = 0; }
+enum DO { ZERO16 = 0; }
+enum ECHO { ZERO17 = 0; }
+enum ELSE { ZERO18 = 0; }
+enum ELSEIF { ZERO19 = 0; }
+enum EMPTY { ZERO20 = 0; }
+enum ENDDECLARE { ZERO21 = 0; }
+enum ENDFOR { ZERO22 = 0; }
+enum ENDFOREACH { ZERO23 = 0; }
+enum ENDIF { ZERO24 = 0; }
+enum ENDSWITCH { ZERO25 = 0; }
+enum ENDWHILE { ZERO26 = 0; }
+enum EVAL { ZERO27 = 0; }
+enum EXIT { ZERO28 = 0; }
+enum EXTENDS { ZERO29 = 0; }
+enum FINAL { ZERO30 = 0; }
+enum FOR { ZERO31 = 0; }
+enum FOREACH { ZERO32 = 0; }
+enum FUNCTION { ZERO33 = 0; }
+enum GLOBAL { ZERO34 = 0; }
+enum GOTO { ZERO35 = 0; }
+enum IF { ZERO36 = 0; }
+enum IMPLEMENTS { ZERO37 = 0; }
+enum INCLUDE { ZERO38 = 0; }
+enum INCLUDE_ONCE { ZERO39 = 0; }
+enum INSTANCEOF { ZERO40 = 0; }
+enum INSTEADOF { ZERO41 = 0; }
+enum INTERFACE { ZERO42 = 0; }
+enum ISSET { ZERO43 = 0; }
+enum LIST { ZERO44 = 0; }
+enum NAMESPACE { ZERO45 = 0; }
+enum NEW { ZERO46 = 0; }
+enum OR { ZERO47 = 0; }
+enum PRINT { ZERO48 = 0; }
+enum PRIVATE { ZERO49 = 0; }
+enum PROTECTED { ZERO50 = 0; }
+enum PUBLIC { ZERO51 = 0; }
+enum REQUIRE { ZERO52 = 0; }
+enum REQUIRE_ONCE { ZERO53 = 0; }
+enum RETURN { ZERO54 = 0; }
+enum STATIC { ZERO55 = 0; }
+enum SWITCH { ZERO56 = 0; }
+enum THROW { ZERO57 = 0; }
+enum TRAIT { ZERO58 = 0; }
+enum TRY { ZERO59 = 0; }
+enum UNSET { ZERO60 = 0; }
+enum USE { ZERO61 = 0; }
+enum VAR { ZERO62 = 0; }
+enum WHILE { ZERO63 = 0; }
+enum XOR { ZERO64 = 0; }
+enum INT { ZERO65 = 0; }
+enum FLOAT { ZERO66 = 0; }
+enum BOOL { ZERO67 = 0; }
+enum STRING { ZERO68 = 0; }
+enum TRUE { ZERO69 = 0; }
+enum FALSE { ZERO70 = 0; }
+enum NULL { ZERO71 = 0; }
+enum VOID { ZERO72 = 0; }
+enum ITERABLE { ZERO73 = 0; }
diff --git a/php/tests/proto/test_reserved_enum_value_lower.proto b/php/tests/proto/test_reserved_enum_value_lower.proto
new file mode 100644
index 00000000..96da319e
--- /dev/null
+++ b/php/tests/proto/test_reserved_enum_value_lower.proto
@@ -0,0 +1,79 @@
+syntax = "proto3";
+
+package lower_enum_value;
+
+enum NotAllowed {
+  abstract = 0;
+  and = 1;
+  array = 2;
+  as = 3;
+  break = 4;
+  callable = 5;
+  case     = 6;
+  catch    = 7;
+  class    = 8;
+  clone    = 9;
+  const    = 10;
+  continue = 11;
+  declare  = 12;
+  default  = 13;
+  die      = 14;
+  do       = 15;
+  echo     = 16;
+  else     = 17;
+  elseif   = 18;
+  empty    = 19;
+  enddeclare = 20;
+  endfor     = 21;
+  endforeach = 22;
+  endif      = 23;
+  endswitch = 24;
+  endwhile = 25;
+  eval = 26;
+  exit = 27;
+  extends = 28;
+  final = 29;
+  for = 30;
+  foreach = 31;
+  function = 32;
+  global = 33;
+  goto = 34;
+  if = 35;
+  implements = 36;
+  include = 37;
+  include_once = 38;
+  instanceof = 39;
+  insteadof = 40;
+  interface = 41;
+  isset = 42;
+  list = 43;
+  namespace = 44;
+  new = 45;
+  or = 46;
+  print = 47;
+  private = 48;
+  protected = 49;
+  public = 50;
+  require = 51;
+  require_once = 52;
+  return = 53;
+  static = 54;
+  switch = 55;
+  throw = 56;
+  trait = 57;
+  try = 58;
+  unset = 59;
+  use = 60;
+  var = 61;
+  while = 62;
+  xor = 63;
+  int = 64;
+  float = 65;
+  bool = 66;
+  string = 67;
+  true = 68;
+  false = 69;
+  null = 70;
+  void = 71;
+  iterable = 72;
+}
diff --git a/php/tests/proto/test_reserved_enum_value_upper.proto b/php/tests/proto/test_reserved_enum_value_upper.proto
new file mode 100644
index 00000000..b026a858
--- /dev/null
+++ b/php/tests/proto/test_reserved_enum_value_upper.proto
@@ -0,0 +1,79 @@
+syntax = "proto3";
+
+package upper_enum_value;
+
+enum NotAllowed {
+  ABSTRACT = 0;
+  AND = 1;
+  ARRAY = 2;
+  AS = 3;
+  BREAK = 4;
+  CALLABLE = 5;
+  CASE     = 6;
+  CATCH    = 7;
+  CLASS    = 8;
+  CLONE    = 9;
+  CONST    = 10;
+  CONTINUE = 11;
+  DECLARE  = 12;
+  DEFAULT  = 13;
+  DIE      = 14;
+  DO       = 15;
+  ECHO     = 16;
+  ELSE     = 17;
+  ELSEIF   = 18;
+  EMPTY    = 19;
+  ENDDECLARE = 20;
+  ENDFOR     = 21;
+  ENDFOREACH = 22;
+  ENDIF      = 23;
+  ENDSWITCH = 24;
+  ENDWHILE = 25;
+  EVAL = 26;
+  EXIT = 27;
+  EXTENDS = 28;
+  FINAL = 29;
+  FOR = 30;
+  FOREACH = 31;
+  FUNCTION = 32;
+  GLOBAL = 33;
+  GOTO = 34;
+  IF = 35;
+  IMPLEMENTS = 36;
+  INCLUDE = 37;
+  INCLUDE_ONCE = 38;
+  INSTANCEOF = 39;
+  INSTEADOF = 40;
+  INTERFACE = 41;
+  ISSET = 42;
+  LIST = 43;
+  NAMESPACE = 44;
+  NEW = 45;
+  OR = 46;
+  PRINT = 47;
+  PRIVATE = 48;
+  PROTECTED = 49;
+  PUBLIC = 50;
+  REQUIRE = 51;
+  REQUIRE_ONCE = 52;
+  RETURN = 53;
+  STATIC = 54;
+  SWITCH = 55;
+  THROW = 56;
+  TRAIT = 57;
+  TRY = 58;
+  UNSET = 59;
+  USE = 60;
+  VAR = 61;
+  WHILE = 62;
+  XOR = 63;
+  INT = 64;
+  FLOAT = 65;
+  BOOL = 66;
+  STRING = 67;
+  TRUE = 68;
+  FALSE = 69;
+  NULL = 70;
+  VOID = 71;
+  ITERABLE = 72;
+}
diff --git a/php/tests/proto/test_reserved_message_lower.proto b/php/tests/proto/test_reserved_message_lower.proto
new file mode 100644
index 00000000..ed120808
--- /dev/null
+++ b/php/tests/proto/test_reserved_message_lower.proto
@@ -0,0 +1,77 @@
+syntax = "proto3";
+
+package lower;
+
+message abstract {}
+message and {}
+message array {}
+message as {}
+message break {}
+message callable {}
+message case {}
+message catch {}
+message class {}
+message clone {}
+message const {}
+message continue {}
+message declare {}
+message default {}
+message die {}
+message do {}
+message echo {}
+message else {}
+message elseif {}
+message empty {}
+message enddeclare {}
+message endfor {}
+message endforeach {}
+message endif {}
+message endswitch {}
+message endwhile {}
+message eval {}
+message exit {}
+message extends {}
+message final {}
+message for {}
+message foreach {}
+message function {}
+message global {}
+message goto {}
+message if {}
+message implements {}
+message include {}
+message include_once {}
+message instanceof {}
+message insteadof {}
+message interface {}
+message isset {}
+message list {}
+message namespace {}
+message new {}
+message or {}
+message print {}
+message private {}
+message protected {}
+message public {}
+message require {}
+message require_once {}
+message return {}
+message static {}
+message switch {}
+message throw {}
+message trait {}
+message try {}
+message unset {}
+message use {}
+message var {}
+message while {}
+message xor {}
+message int {}
+message float {}
+message bool {}
+message string {}
+message true {}
+message false {}
+message null {}
+message void {}
+message iterable {}
diff --git a/php/tests/proto/test_reserved_message_upper.proto b/php/tests/proto/test_reserved_message_upper.proto
new file mode 100644
index 00000000..2917fd11
--- /dev/null
+++ b/php/tests/proto/test_reserved_message_upper.proto
@@ -0,0 +1,77 @@
+syntax = "proto3";
+
+package upper;
+
+message ABSTRACT {}
+message AND {}
+message ARRAY {}
+message AS {}
+message BREAK {}
+message CALLABLE {}
+message CASE {}
+message CATCH {}
+message CLASS {}
+message CLONE {}
+message CONST {}
+message CONTINUE {}
+message DECLARE {}
+message DEFAULT {}
+message DIE {}
+message DO {}
+message ECHO {}
+message ELSE {}
+message ELSEIF {}
+message EMPTY {}
+message ENDDECLARE {}
+message ENDFOR {}
+message ENDFOREACH {}
+message ENDIF {}
+message ENDSWITCH {}
+message ENDWHILE {}
+message EVAL {}
+message EXIT {}
+message EXTENDS {}
+message FINAL {}
+message FOR {}
+message FOREACH {}
+message FUNCTION {}
+message GLOBAL {}
+message GOTO {}
+message IF {}
+message IMPLEMENTS {}
+message INCLUDE {}
+message INCLUDE_ONCE {}
+message INSTANCEOF {}
+message INSTEADOF {}
+message INTERFACE {}
+message ISSET {}
+message LIST {}
+message NAMESPACE {}
+message NEW {}
+message OR {}
+message PRINT {}
+message PRIVATE {}
+message PROTECTED {}
+message PUBLIC {}
+message REQUIRE {}
+message REQUIRE_ONCE {}
+message RETURN {}
+message STATIC {}
+message SWITCH {}
+message THROW {}
+message TRAIT {}
+message TRY {}
+message UNSET {}
+message USE {}
+message VAR {}
+message WHILE {}
+message XOR {}
+message INT {}
+message FLOAT {}
+message BOOL {}
+message STRING {}
+message TRUE {}
+message FALSE {}
+message NULL {}
+message VOID {}
+message ITERABLE {}
diff --git a/php/tests/proto/test_service.proto b/php/tests/proto/test_service.proto
new file mode 100644
index 00000000..a03dbc46
--- /dev/null
+++ b/php/tests/proto/test_service.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package foo;
+
+option php_generic_services = true;
+
+service Greeter {
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+  rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}
+}
+
+message HelloRequest {
+  string name = 1;
+}
+
+message HelloReply {
+  string message = 1;
+}
diff --git a/php/tests/proto/test_service_namespace.proto b/php/tests/proto/test_service_namespace.proto
new file mode 100644
index 00000000..719aa484
--- /dev/null
+++ b/php/tests/proto/test_service_namespace.proto
@@ -0,0 +1,13 @@
+syntax = "proto3";
+
+import "proto/test_service.proto";
+
+package foo;
+
+option php_generic_services = true;
+option php_namespace = "Bar";
+
+service OtherGreeter {
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+  rpc SayHelloAgain (HelloRequest) returns (HelloReply) {}
+}
diff --git a/php/tests/test.sh b/php/tests/test.sh
index fc3f0186..6e70eb2a 100755
--- a/php/tests/test.sh
+++ b/php/tests/test.sh
@@ -1,14 +1,20 @@
 #!/bin/bash
 
+VERSION=$1
+
+export PATH=/usr/local/php-$VERSION/bin:$PATH
+export C_INCLUDE_PATH=/usr/local/php-$VERSION/include/php/main:/usr/local/php-$VERSION/include/php:$C_INCLUDE_PATH
+export CPLUS_INCLUDE_PATH=/usr/local/php-$VERSION/include/php/main:/usr/local/php-$VERSION/include/php:$CPLUS_INCLUDE_PATH
+
 # Compile c extension
 pushd ../ext/google/protobuf/
-make clean
+make clean || true
 set -e
 # Add following in configure for debug: --enable-debug CFLAGS='-g -O0'
-phpize && ./configure  --enable-debug CFLAGS='-g -O0' && make
+phpize && ./configure CFLAGS='-g -O0' && make
 popd
 
-tests=( array_test.php encode_decode_test.php generated_class_test.php map_field_test.php well_known_test.php )
+tests=( array_test.php encode_decode_test.php generated_class_test.php generated_phpdoc_test.php map_field_test.php well_known_test.php generated_service_test.php descriptors_test.php )
 
 for t in "${tests[@]}"
 do
@@ -25,3 +31,15 @@ done
 export ZEND_DONT_UNLOAD_MODULES=1
 export USE_ZEND_ALLOC=0
 valgrind --leak-check=yes php -dextension=../ext/google/protobuf/modules/protobuf.so memory_leak_test.php
+
+# TODO(teboring): Only for debug (phpunit has memory leak which blocks this beging used by
+# regresssion test.)
+
+# for t in "${tests[@]}"
+# do
+#   echo "****************************"
+#   echo "* $t (memory leak)"
+#   echo "****************************"
+#   valgrind --leak-check=yes php -dextension=../ext/google/protobuf/modules/protobuf.so `which phpunit` --bootstrap autoload.php $t
+#   echo ""
+# done
diff --git a/php/tests/test_base.php b/php/tests/test_base.php
index 67048f4c..80f603c7 100644
--- a/php/tests/test_base.php
+++ b/php/tests/test_base.php
@@ -2,7 +2,7 @@
 
 use Foo\TestMessage;
 use Foo\TestEnum;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 
 class TestBase extends PHPUnit_Framework_TestCase
 {
@@ -19,6 +19,8 @@ class TestBase extends PHPUnit_Framework_TestCase
 
     public function expectFields(TestMessage $m)
     {
+        $this->assertSame(-42,  $m->getOptionalInt32());
+        $this->assertSame(42,  $m->getOptionalUint32());
         $this->assertSame(-44,  $m->getOptionalSint32());
         $this->assertSame(46,   $m->getOptionalFixed32());
         $this->assertSame(-46,  $m->getOptionalSfixed32());
@@ -27,6 +29,7 @@ class TestBase extends PHPUnit_Framework_TestCase
         $this->assertSame(true, $m->getOptionalBool());
         $this->assertSame('a',  $m->getOptionalString());
         $this->assertSame('b',  $m->getOptionalBytes());
+        $this->assertSame(TestEnum::ONE, $m->getOptionalEnum());
         $this->assertSame(33,   $m->getOptionalMessage()->getA());
         if (PHP_INT_SIZE == 4) {
             $this->assertSame('-43',  $m->getOptionalInt64());
diff --git a/php/tests/test_util.php b/php/tests/test_util.php
index 9c8e34d2..a676d097 100644
--- a/php/tests/test_util.php
+++ b/php/tests/test_util.php
@@ -2,7 +2,7 @@
 
 use Foo\TestEnum;
 use Foo\TestMessage;
-use Foo\TestMessage_Sub;
+use Foo\TestMessage\Sub;
 use Foo\TestPackedMessage;
 use Foo\TestUnpackedMessage;
 
@@ -51,8 +51,6 @@ class TestUtil
 
     public static function setTestMessage(TestMessage $m)
     {
-        $sub = new TestMessage_Sub();
-
         $m->setOptionalInt32(-42);
         $m->setOptionalInt64(-43);
         $m->setOptionalUint32(42);
@@ -69,70 +67,71 @@ class TestUtil
         $m->setOptionalString('a');
         $m->setOptionalBytes('b');
         $m->setOptionalEnum(TestEnum::ONE);
+        $sub = new Sub();
         $m->setOptionalMessage($sub);
         $m->getOptionalMessage()->SetA(33);
 
-        $m->getRepeatedInt32()    []= -42;
-        $m->getRepeatedInt64()    []= -43;
-        $m->getRepeatedUint32()   []=  42;
-        $m->getRepeatedUint64()   []=  43;
-        $m->getRepeatedSint32()   []= -44;
-        $m->getRepeatedSint64()   []= -45;
-        $m->getRepeatedFixed32()  []=  46;
-        $m->getRepeatedFixed64()  []=  47;
-        $m->getRepeatedSfixed32() []= -46;
-        $m->getRepeatedSfixed64() []= -47;
-        $m->getRepeatedFloat()    []= 1.5;
-        $m->getRepeatedDouble()   []= 1.6;
-        $m->getRepeatedBool()     []= true;
-        $m->getRepeatedString()   []= 'a';
-        $m->getRepeatedBytes()    []= 'b';
-        $m->getRepeatedEnum()     []= TestEnum::ZERO;
-        $m->getRepeatedMessage()  []= new TestMessage_Sub();
+        self::appendHelper($m, 'RepeatedInt32',    -42);
+        self::appendHelper($m, 'RepeatedInt64',    -43);
+        self::appendHelper($m, 'RepeatedUint32',    42);
+        self::appendHelper($m, 'RepeatedUint64',    43);
+        self::appendHelper($m, 'RepeatedSint32',   -44);
+        self::appendHelper($m, 'RepeatedSint64',   -45);
+        self::appendHelper($m, 'RepeatedFixed32',   46);
+        self::appendHelper($m, 'RepeatedFixed64',   47);
+        self::appendHelper($m, 'RepeatedSfixed32', -46);
+        self::appendHelper($m, 'RepeatedSfixed64', -47);
+        self::appendHelper($m, 'RepeatedFloat',    1.5);
+        self::appendHelper($m, 'RepeatedDouble',   1.6);
+        self::appendHelper($m, 'RepeatedBool',     true);
+        self::appendHelper($m, 'RepeatedString',   'a');
+        self::appendHelper($m, 'RepeatedBytes',    'b');
+        self::appendHelper($m, 'RepeatedEnum',     TestEnum::ZERO);
+        self::appendHelper($m, 'RepeatedMessage',  new Sub());
         $m->getRepeatedMessage()[0]->setA(34);
 
-        $m->getRepeatedInt32()    []= -52;
-        $m->getRepeatedInt64()    []= -53;
-        $m->getRepeatedUint32()   []=  52;
-        $m->getRepeatedUint64()   []=  53;
-        $m->getRepeatedSint32()   []= -54;
-        $m->getRepeatedSint64()   []= -55;
-        $m->getRepeatedFixed32()  []=  56;
-        $m->getRepeatedFixed64()  []=  57;
-        $m->getRepeatedSfixed32() []= -56;
-        $m->getRepeatedSfixed64() []= -57;
-        $m->getRepeatedFloat()    []= 2.5;
-        $m->getRepeatedDouble()   []= 2.6;
-        $m->getRepeatedBool()     []= false;
-        $m->getRepeatedString()   []= 'c';
-        $m->getRepeatedBytes()    []= 'd';
-        $m->getRepeatedEnum()     []= TestEnum::ONE;
-        $m->getRepeatedMessage()  []= new TestMessage_Sub();
+        self::appendHelper($m, 'RepeatedInt32',    -52);
+        self::appendHelper($m, 'RepeatedInt64',    -53);
+        self::appendHelper($m, 'RepeatedUint32',    52);
+        self::appendHelper($m, 'RepeatedUint64',    53);
+        self::appendHelper($m, 'RepeatedSint32',   -54);
+        self::appendHelper($m, 'RepeatedSint64',   -55);
+        self::appendHelper($m, 'RepeatedFixed32',   56);
+        self::appendHelper($m, 'RepeatedFixed64',   57);
+        self::appendHelper($m, 'RepeatedSfixed32', -56);
+        self::appendHelper($m, 'RepeatedSfixed64', -57);
+        self::appendHelper($m, 'RepeatedFloat',    2.5);
+        self::appendHelper($m, 'RepeatedDouble',   2.6);
+        self::appendHelper($m, 'RepeatedBool',     false);
+        self::appendHelper($m, 'RepeatedString',   'c');
+        self::appendHelper($m, 'RepeatedBytes',    'd');
+        self::appendHelper($m, 'RepeatedEnum',     TestEnum::ONE);
+        self::appendHelper($m, 'RepeatedMessage',  new Sub());
         $m->getRepeatedMessage()[1]->SetA(35);
 
-        $m->getMapInt32Int32()[-62] = -62;
-        $m->getMapInt64Int64()[-63] = -63;
-        $m->getMapUint32Uint32()[62] = 62;
-        $m->getMapUint64Uint64()[63] = 63;
-        $m->getMapSint32Sint32()[-64] = -64;
-        $m->getMapSint64Sint64()[-65] = -65;
-        $m->getMapFixed32Fixed32()[66] = 66;
-        $m->getMapFixed64Fixed64()[67] = 67;
-        $m->getMapSfixed32Sfixed32()[-68] = -68;
-        $m->getMapSfixed64Sfixed64()[-69] = -69;
-        $m->getMapInt32Float()[1] = 3.5;
-        $m->getMapInt32Double()[1] = 3.6;
-        $m->getMapBoolBool()[true] = true;
-        $m->getMapStringString()['e'] = 'e';
-        $m->getMapInt32Bytes()[1] = 'f';
-        $m->getMapInt32Enum()[1] = TestEnum::ONE;
-        $m->getMapInt32Message()[1] = new TestMessage_Sub();
+        self::kvUpdateHelper($m, 'MapInt32Int32', -62, -62);
+        self::kvUpdateHelper($m, 'MapInt64Int64', -63, -63);
+        self::kvUpdateHelper($m, 'MapUint32Uint32', 62, 62);
+        self::kvUpdateHelper($m, 'MapUint64Uint64', 63, 63);
+        self::kvUpdateHelper($m, 'MapSint32Sint32', -64, -64);
+        self::kvUpdateHelper($m, 'MapSint64Sint64', -65, -65);
+        self::kvUpdateHelper($m, 'MapFixed32Fixed32', 66, 66);
+        self::kvUpdateHelper($m, 'MapFixed64Fixed64', 67, 67);
+        self::kvUpdateHelper($m, 'MapSfixed32Sfixed32', -68, -68);
+        self::kvUpdateHelper($m, 'MapSfixed64Sfixed64', -69, -69);
+        self::kvUpdateHelper($m, 'MapInt32Float', 1, 3.5);
+        self::kvUpdateHelper($m, 'MapInt32Double', 1, 3.6);
+        self::kvUpdateHelper($m, 'MapBoolBool', true, true);
+        self::kvUpdateHelper($m, 'MapStringString', 'e', 'e');
+        self::kvUpdateHelper($m, 'MapInt32Bytes', 1, 'f');
+        self::kvUpdateHelper($m, 'MapInt32Enum', 1, TestEnum::ONE);
+        self::kvUpdateHelper($m, 'MapInt32Message', 1, new Sub());
         $m->getMapInt32Message()[1]->SetA(36);
     }
 
     public static function setTestMessage2(TestMessage $m)
     {
-        $sub = new TestMessage_Sub();
+        $sub = new Sub();
 
         $m->setOptionalInt32(-142);
         $m->setOptionalInt64(-143);
@@ -153,61 +152,61 @@ class TestUtil
         $m->setOptionalMessage($sub);
         $m->getOptionalMessage()->SetA(133);
 
-        $m->getRepeatedInt32()    []= -142;
-        $m->getRepeatedInt64()    []= -143;
-        $m->getRepeatedUint32()   []=  142;
-        $m->getRepeatedUint64()   []=  143;
-        $m->getRepeatedSint32()   []= -144;
-        $m->getRepeatedSint64()   []= -145;
-        $m->getRepeatedFixed32()  []=  146;
-        $m->getRepeatedFixed64()  []=  147;
-        $m->getRepeatedSfixed32() []= -146;
-        $m->getRepeatedSfixed64() []= -147;
-        $m->getRepeatedFloat()    []= 11.5;
-        $m->getRepeatedDouble()   []= 11.6;
-        $m->getRepeatedBool()     []= false;
-        $m->getRepeatedString()   []= 'aa';
-        $m->getRepeatedBytes()    []= 'bb';
-        $m->getRepeatedEnum()     []= TestEnum::TWO;
-        $m->getRepeatedMessage()  []= new TestMessage_Sub();
+        self::appendHelper($m, 'RepeatedInt32',    -142);
+        self::appendHelper($m, 'RepeatedInt64',    -143);
+        self::appendHelper($m, 'RepeatedUint32',    142);
+        self::appendHelper($m, 'RepeatedUint64',    143);
+        self::appendHelper($m, 'RepeatedSint32',   -144);
+        self::appendHelper($m, 'RepeatedSint64',   -145);
+        self::appendHelper($m, 'RepeatedFixed32',   146);
+        self::appendHelper($m, 'RepeatedFixed64',   147);
+        self::appendHelper($m, 'RepeatedSfixed32', -146);
+        self::appendHelper($m, 'RepeatedSfixed64', -147);
+        self::appendHelper($m, 'RepeatedFloat',    11.5);
+        self::appendHelper($m, 'RepeatedDouble',   11.6);
+        self::appendHelper($m, 'RepeatedBool',     false);
+        self::appendHelper($m, 'RepeatedString',   'aa');
+        self::appendHelper($m, 'RepeatedBytes',    'bb');
+        self::appendHelper($m, 'RepeatedEnum',     TestEnum::TWO);
+        self::appendHelper($m, 'RepeatedMessage',  new Sub());
         $m->getRepeatedMessage()[0]->setA(134);
 
-        $m->getMapInt32Int32()[-62] = -162;
-        $m->getMapInt64Int64()[-63] = -163;
-        $m->getMapUint32Uint32()[62] = 162;
-        $m->getMapUint64Uint64()[63] = 163;
-        $m->getMapSint32Sint32()[-64] = -164;
-        $m->getMapSint64Sint64()[-65] = -165;
-        $m->getMapFixed32Fixed32()[66] = 166;
-        $m->getMapFixed64Fixed64()[67] = 167;
-        $m->getMapSfixed32Sfixed32()[-68] = -168;
-        $m->getMapSfixed64Sfixed64()[-69] = -169;
-        $m->getMapInt32Float()[1] = 13.5;
-        $m->getMapInt32Double()[1] = 13.6;
-        $m->getMapBoolBool()[true] = false;
-        $m->getMapStringString()['e'] = 'ee';
-        $m->getMapInt32Bytes()[1] = 'ff';
-        $m->getMapInt32Enum()[1] = TestEnum::TWO;
-        $m->getMapInt32Message()[1] = new TestMessage_Sub();
+        self::kvUpdateHelper($m, 'MapInt32Int32', -62, -162);
+        self::kvUpdateHelper($m, 'MapInt64Int64', -63, -163);
+        self::kvUpdateHelper($m, 'MapUint32Uint32', 62, 162);
+        self::kvUpdateHelper($m, 'MapUint64Uint64', 63, 163);
+        self::kvUpdateHelper($m, 'MapSint32Sint32', -64, -164);
+        self::kvUpdateHelper($m, 'MapSint64Sint64', -65, -165);
+        self::kvUpdateHelper($m, 'MapFixed32Fixed32', 66, 166);
+        self::kvUpdateHelper($m, 'MapFixed64Fixed64', 67, 167);
+        self::kvUpdateHelper($m, 'MapSfixed32Sfixed32', -68, -168);
+        self::kvUpdateHelper($m, 'MapSfixed64Sfixed64', -69, -169);
+        self::kvUpdateHelper($m, 'MapInt32Float', 1, 13.5);
+        self::kvUpdateHelper($m, 'MapInt32Double', 1, 13.6);
+        self::kvUpdateHelper($m, 'MapBoolBool', true, false);
+        self::kvUpdateHelper($m, 'MapStringString', 'e', 'ee');
+        self::kvUpdateHelper($m, 'MapInt32Bytes', 1, 'ff');
+        self::kvUpdateHelper($m, 'MapInt32Enum', 1, TestEnum::TWO);
+        self::kvUpdateHelper($m, 'MapInt32Message', 1, new Sub());
         $m->getMapInt32Message()[1]->SetA(136);
 
-        $m->getMapInt32Int32()[-162] = -162;
-        $m->getMapInt64Int64()[-163] = -163;
-        $m->getMapUint32Uint32()[162] = 162;
-        $m->getMapUint64Uint64()[163] = 163;
-        $m->getMapSint32Sint32()[-164] = -164;
-        $m->getMapSint64Sint64()[-165] = -165;
-        $m->getMapFixed32Fixed32()[166] = 166;
-        $m->getMapFixed64Fixed64()[167] = 167;
-        $m->getMapSfixed32Sfixed32()[-168] = -168;
-        $m->getMapSfixed64Sfixed64()[-169] = -169;
-        $m->getMapInt32Float()[2] = 13.5;
-        $m->getMapInt32Double()[2] = 13.6;
-        $m->getMapBoolBool()[false] = false;
-        $m->getMapStringString()['ee'] = 'ee';
-        $m->getMapInt32Bytes()[2] = 'ff';
-        $m->getMapInt32Enum()[2] = TestEnum::TWO;
-        $m->getMapInt32Message()[2] = new TestMessage_Sub();
+        self::kvUpdateHelper($m, 'MapInt32Int32', -162, -162);
+        self::kvUpdateHelper($m, 'MapInt64Int64', -163, -163);
+        self::kvUpdateHelper($m, 'MapUint32Uint32', 162, 162);
+        self::kvUpdateHelper($m, 'MapUint64Uint64', 163, 163);
+        self::kvUpdateHelper($m, 'MapSint32Sint32', -164, -164);
+        self::kvUpdateHelper($m, 'MapSint64Sint64', -165, -165);
+        self::kvUpdateHelper($m, 'MapFixed32Fixed32', 166, 166);
+        self::kvUpdateHelper($m, 'MapFixed64Fixed64', 167, 167);
+        self::kvUpdateHelper($m, 'MapSfixed32Sfixed32', -168, -168);
+        self::kvUpdateHelper($m, 'MapSfixed64Sfixed64', -169, -169);
+        self::kvUpdateHelper($m, 'MapInt32Float', 2, 13.5);
+        self::kvUpdateHelper($m, 'MapInt32Double', 2, 13.6);
+        self::kvUpdateHelper($m, 'MapBoolBool', false, false);
+        self::kvUpdateHelper($m, 'MapStringString', 'ee', 'ee');
+        self::kvUpdateHelper($m, 'MapInt32Bytes', 2, 'ff');
+        self::kvUpdateHelper($m, 'MapInt32Enum', 2, TestEnum::TWO);
+        self::kvUpdateHelper($m, 'MapInt32Message', 2, new Sub());
         $m->getMapInt32Message()[2]->SetA(136);
     }
 
@@ -321,7 +320,7 @@ class TestUtil
     public static function getGoldenTestMessage()
     {
         return hex2bin(
-            "08D6FFFFFF0F" .
+            "08D6FFFFFFFFFFFFFFFF01" .
             "10D5FFFFFFFFFFFFFFFF01" .
             "182A" .
             "202B" .
@@ -339,8 +338,8 @@ class TestUtil
             "800101" .
             "8A01020821" .
 
-            "F801D6FFFFFF0F" .
-            "F801CCFFFFFF0F" .
+            "F801D6FFFFFFFFFFFFFFFF01" .
+            "F801CCFFFFFFFFFFFFFFFF01" .
             "8002D5FFFFFFFFFFFFFFFF01" .
             "8002CBFFFFFFFFFFFFFFFF01" .
             "88022A" .
@@ -374,7 +373,7 @@ class TestUtil
             "FA02020822" .
             "FA02020823" .
 
-            "BA040C08C2FFFFFF0F10C2FFFFFF0F" .
+            "BA041608C2FFFFFFFFFFFFFFFF0110C2FFFFFFFFFFFFFFFF01" .
             "C2041608C1FFFFFFFFFFFFFFFF0110C1FFFFFFFFFFFFFFFF01" .
             "CA0404083E103E" .
             "D20404083F103F" .
@@ -396,34 +395,34 @@ class TestUtil
 
     public static function setTestPackedMessage($m)
     {
-        $m->getRepeatedInt32()[] = -42;
-        $m->getRepeatedInt32()[] = -52;
-        $m->getRepeatedInt64()[] = -43;
-        $m->getRepeatedInt64()[] = -53;
-        $m->getRepeatedUint32()[] = 42;
-        $m->getRepeatedUint32()[] = 52;
-        $m->getRepeatedUint64()[] = 43;
-        $m->getRepeatedUint64()[] = 53;
-        $m->getRepeatedSint32()[] = -44;
-        $m->getRepeatedSint32()[] = -54;
-        $m->getRepeatedSint64()[] = -45;
-        $m->getRepeatedSint64()[] = -55;
-        $m->getRepeatedFixed32()[] = 46;
-        $m->getRepeatedFixed32()[] = 56;
-        $m->getRepeatedFixed64()[] = 47;
-        $m->getRepeatedFixed64()[] = 57;
-        $m->getRepeatedSfixed32()[] = -46;
-        $m->getRepeatedSfixed32()[] = -56;
-        $m->getRepeatedSfixed64()[] = -47;
-        $m->getRepeatedSfixed64()[] = -57;
-        $m->getRepeatedFloat()[] = 1.5;
-        $m->getRepeatedFloat()[] = 2.5;
-        $m->getRepeatedDouble()[] = 1.6;
-        $m->getRepeatedDouble()[] = 2.6;
-        $m->getRepeatedBool()[] = true;
-        $m->getRepeatedBool()[] = false;
-        $m->getRepeatedEnum()[] = TestEnum::ONE;
-        $m->getRepeatedEnum()[] = TestEnum::ZERO;
+        self::appendHelper($m, 'RepeatedInt32', -42);
+        self::appendHelper($m, 'RepeatedInt32', -52);
+        self::appendHelper($m, 'RepeatedInt64', -43);
+        self::appendHelper($m, 'RepeatedInt64', -53);
+        self::appendHelper($m, 'RepeatedUint32', 42);
+        self::appendHelper($m, 'RepeatedUint32', 52);
+        self::appendHelper($m, 'RepeatedUint64', 43);
+        self::appendHelper($m, 'RepeatedUint64', 53);
+        self::appendHelper($m, 'RepeatedSint32', -44);
+        self::appendHelper($m, 'RepeatedSint32', -54);
+        self::appendHelper($m, 'RepeatedSint64', -45);
+        self::appendHelper($m, 'RepeatedSint64', -55);
+        self::appendHelper($m, 'RepeatedFixed32', 46);
+        self::appendHelper($m, 'RepeatedFixed32', 56);
+        self::appendHelper($m, 'RepeatedFixed64', 47);
+        self::appendHelper($m, 'RepeatedFixed64', 57);
+        self::appendHelper($m, 'RepeatedSfixed32', -46);
+        self::appendHelper($m, 'RepeatedSfixed32', -56);
+        self::appendHelper($m, 'RepeatedSfixed64', -47);
+        self::appendHelper($m, 'RepeatedSfixed64', -57);
+        self::appendHelper($m, 'RepeatedFloat', 1.5);
+        self::appendHelper($m, 'RepeatedFloat', 2.5);
+        self::appendHelper($m, 'RepeatedDouble', 1.6);
+        self::appendHelper($m, 'RepeatedDouble', 2.6);
+        self::appendHelper($m, 'RepeatedBool', true);
+        self::appendHelper($m, 'RepeatedBool', false);
+        self::appendHelper($m, 'RepeatedEnum', TestEnum::ONE);
+        self::appendHelper($m, 'RepeatedEnum', TestEnum::ZERO);
     }
 
     public static function assertTestPackedMessage($m)
@@ -489,7 +488,7 @@ class TestUtil
     public static function getGoldenTestPackedMessage()
     {
         return hex2bin(
-            "D2050AD6FFFFFF0FCCFFFFFF0F" .
+            "D20514D6FFFFFFFFFFFFFFFF01CCFFFFFFFFFFFFFFFF01" .
             "DA0514D5FFFFFFFFFFFFFFFF01CBFFFFFFFFFFFFFFFF01" .
             "E205022A34" .
             "EA05022B35" .
@@ -509,7 +508,7 @@ class TestUtil
     public static function getGoldenTestUnpackedMessage()
     {
         return hex2bin(
-            "D005D6FFFFFF0FD005CCFFFFFF0F" .
+            "D005D6FFFFFFFFFFFFFFFF01D005CCFFFFFFFFFFFFFFFF01" .
             "D805D5FFFFFFFFFFFFFFFF01D805CBFFFFFFFFFFFFFFFF01" .
             "E0052AE00534" .
             "E8052BE80535" .
@@ -525,4 +524,24 @@ class TestUtil
             "B80601B80600"
         );
     }
+
+    private static function appendHelper($obj, $func_suffix, $value)
+    {
+        $getter_function = 'get'.$func_suffix;
+        $setter_function = 'set'.$func_suffix;
+
+        $arr = $obj->$getter_function();
+        $arr[] = $value;
+        $obj->$setter_function($arr);
+    }
+
+    private static function kvUpdateHelper($obj, $func_suffix, $key, $value)
+    {
+        $getter_function = 'get'.$func_suffix;
+        $setter_function = 'set'.$func_suffix;
+
+        $arr = $obj->$getter_function();
+        $arr[$key] = $value;
+        $obj->$setter_function($arr);
+    }
 }
diff --git a/php/tests/undefined_test.php b/php/tests/undefined_test.php
new file mode 100644
index 00000000..f8444571
--- /dev/null
+++ b/php/tests/undefined_test.php
@@ -0,0 +1,920 @@
+<?php
+
+require_once('test_util.php');
+
+use Google\Protobuf\Internal\RepeatedField;
+use Google\Protobuf\Internal\GPBType;
+use Foo\TestMessage;
+use Foo\TestMessage\Sub;
+
+class UndefinedTest extends PHPUnit_Framework_TestCase
+{
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32AppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = 0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32AppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = 0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32AppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT32);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT32);
+        $arr[] = 0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32AppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT32);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT32);
+        $arr[] = 0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64AppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::INT64);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::INT64);
+        $arr[] = 0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64AppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::INT64);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::INT64);
+        $arr[] = 0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64AppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT64);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT64);
+        $arr[] = 0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64AppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT64);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::UINT64);
+        $arr[] = 0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatAppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::FLOAT);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatSetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::FLOAT);
+        $arr[] = 0.0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatAppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::FLOAT);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatSetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::FLOAT);
+        $arr[] = 0.0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleAppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::DOUBLE);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleSetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::DOUBLE);
+        $arr[] = 0.0;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleAppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::DOUBLE);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleSetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::DOUBLE);
+        $arr[] = 0.0;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testBoolAppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::BOOL);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testBoolSetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::BOOL);
+        $arr[] = true;
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringAppendMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::STRING);
+        $arr[] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::STRING);
+        $arr[] = 'abc';
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringAppendInvalidUTF8Fail()
+    {
+        $arr = new RepeatedField(GPBType::STRING);
+        $hex = hex2bin("ff");
+        $arr[] = $hex;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetInvalidUTF8Fail()
+    {
+        $arr = new RepeatedField(GPBType::STRING);
+        $arr[] = 'abc';
+        $hex = hex2bin("ff");
+        $arr[0] = $hex;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageAppendIntFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = 1;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetIntFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = new Sub;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageAppendStringFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetStringFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = new Sub;
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageAppendOtherMessageFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = new TestMessage;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageAppendNullFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $null = null;
+        $arr[] = $null;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetNullFail()
+    {
+        $arr = new RepeatedField(GPBType::MESSAGE, Sub::class);
+        $arr[] = new Sub();
+        $null = null;
+        $arr[0] = $null;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRemoveMiddleFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+
+        $arr[] = 0;
+        $arr[] = 1;
+        $arr[] = 2;
+        $this->assertSame(3, count($arr));
+
+        unset($arr[1]);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRemoveEmptyFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+
+        unset($arr[0]);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageOffsetFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = 0;
+        $arr[new Sub()] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringOffsetFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[] = 0;
+        $arr['abc'] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testSetNonExistedOffsetFail()
+    {
+        $arr = new RepeatedField(GPBType::INT32);
+        $arr[0] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32FieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalInt32(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32FieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalInt32('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32FieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalUint32(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32FieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalUint32('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64FieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalInt64(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64FieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalInt64('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64FieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalUint64(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64FieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalUint64('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatFieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalFloat(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testFloatFieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalFloat('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleFieldInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalDouble(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleFieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalDouble('abc');
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testBoolFieldInvalidStringFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalBool(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringFieldInvalidUTF8Fail()
+    {
+        $m = new TestMessage();
+        $hex = hex2bin("ff");
+        $m->setOptionalString($hex);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageFieldWrongTypeFail()
+    {
+        $m = new TestMessage();
+        $a = 1;
+        $m->setOptionalMessage($a);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageFieldWrongClassFail()
+    {
+        $m = new TestMessage();
+        $m->setOptionalMessage(new TestMessage());
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRepeatedFieldWrongTypeFail()
+    {
+        $m = new TestMessage();
+        $a = 1;
+        $m->setRepeatedInt32($a);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRepeatedFieldWrongObjectFail()
+    {
+        $m = new TestMessage();
+        $m->setRepeatedInt32($m);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRepeatedFieldWrongRepeatedTypeFail()
+    {
+        $m = new TestMessage();
+
+        $repeated_int32 = new RepeatedField(GPBType::UINT32);
+        $m->setRepeatedInt32($repeated_int32);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testRepeatedFieldWrongRepeatedMessageClassFail()
+    {
+        $m = new TestMessage();
+
+        $repeated_message = new RepeatedField(GPBType::MESSAGE,
+                                              TestMessage::class);
+        $m->setRepeatedMessage($repeated_message);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMapFieldWrongTypeFail()
+    {
+        $m = new TestMessage();
+        $a = 1;
+        $m->setMapInt32Int32($a);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMapFieldWrongObjectFail()
+    {
+        $m = new TestMessage();
+        $m->setMapInt32Int32($m);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMapFieldWrongRepeatedTypeFail()
+    {
+        $m = new TestMessage();
+
+        $map_uint32_uint32 = new MapField(GPBType::UINT32, GPBType::UINT32);
+        $m->setMapInt32Int32($map_uint32_uint32);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMapFieldWrongRepeatedMessageClassFail()
+    {
+        $m = new TestMessage();
+
+        $map_int32_message = new MapField(GPBType::INT32,
+                                          GPBType::MESSAGE,
+                                          TestMessage::class);
+        $m->setMapInt32Message($map_int32_message);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageMergeFromInvalidTypeFail()
+    {
+        $m = new TestMessage();
+        $n = new Sub();
+        $m->mergeFrom($n);
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetStringKeyFail()
+    {
+        $arr = new MapField(GPBType::INT32, GPBType::INT32);
+        $arr['abc'] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetStringValueFail()
+    {
+        $arr = new MapField(GPBType::INT32, GPBType::INT32);
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::INT32, GPBType::INT32);
+        $arr[new Sub()] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt32SetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::INT32, GPBType::INT32);
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetStringKeyFail()
+    {
+        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
+        $arr['abc'] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetStringValueFail()
+    {
+        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
+        $arr[new Sub()] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint32SetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::UINT32, GPBType::UINT32);
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetStringKeyFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::INT64);
+        $arr['abc'] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetStringValueFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::INT64);
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::INT64);
+        $arr[new Sub()] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInt64SetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::INT64);
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetStringKeyFail()
+    {
+        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
+        $arr['abc'] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetStringValueFail()
+    {
+        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
+        $arr[new Sub()] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testUint64SetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::UINT64, GPBType::UINT64);
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleSetStringValueFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::DOUBLE);
+        $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testDoubleSetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::INT64, GPBType::DOUBLE);
+        $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testBoolSetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::BOOL, GPBType::BOOL);
+        $arr[new Sub()] = true;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testBoolSetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::BOOL, GPBType::BOOL);
+        $arr[true] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetInvalidUTF8KeyFail()
+    {
+        $arr = new MapField(GPBType::STRING, GPBType::STRING);
+        $arr[hex2bin("ff")] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetInvalidUTF8ValueFail()
+    {
+        $arr = new MapField(GPBType::STRING, GPBType::STRING);
+        $arr['abc'] = hex2bin("ff");
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetMessageKeyFail()
+    {
+        $arr = new MapField(GPBType::STRING, GPBType::STRING);
+        $arr[new Sub()] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testStringSetMessageValueFail()
+    {
+        $arr = new MapField(GPBType::STRING, GPBType::STRING);
+        $arr['abc'] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetIntValueFail()
+    {
+       $arr =
+           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
+       $arr[0] = 0;
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetStringValueFail()
+    {
+       $arr =
+           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
+       $arr[0] = 'abc';
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetOtherMessageValueFail()
+    {
+       $arr =
+           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
+       $arr[0] = new Sub();
+    }
+
+    /**
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testMessageSetNullFail()
+    {
+       $arr =
+           new MapField(GPBType::INT32, GPBType::MESSAGE, TestMessage::class);
+       $null = NULL;
+       $arr[0] = $null;
+    }
+
+}
diff --git a/php/tests/well_known_test.php b/php/tests/well_known_test.php
index 40ff1c8f..1e8c4f42 100644
--- a/php/tests/well_known_test.php
+++ b/php/tests/well_known_test.php
@@ -1,11 +1,393 @@
 <?php
 
+require_once('test_base.php');
+require_once('test_util.php');
+
+use Foo\TestMessage;
+use Google\Protobuf\Any;
+use Google\Protobuf\Api;
+use Google\Protobuf\BoolValue;
+use Google\Protobuf\BytesValue;
+use Google\Protobuf\DoubleValue;
+use Google\Protobuf\Duration;
+use Google\Protobuf\Enum;
+use Google\Protobuf\EnumValue;
+use Google\Protobuf\Field;
+use Google\Protobuf\FieldMask;
+use Google\Protobuf\Field\Cardinality;
+use Google\Protobuf\Field\Kind;
+use Google\Protobuf\FloatValue;
 use Google\Protobuf\GPBEmpty;
+use Google\Protobuf\Int32Value;
+use Google\Protobuf\Int64Value;
+use Google\Protobuf\ListValue;
+use Google\Protobuf\Method;
+use Google\Protobuf\Mixin;
+use Google\Protobuf\NullValue;
+use Google\Protobuf\Option;
+use Google\Protobuf\SourceContext;
+use Google\Protobuf\StringValue;
+use Google\Protobuf\Struct;
+use Google\Protobuf\Syntax;
+use Google\Protobuf\Timestamp;
+use Google\Protobuf\Type;
+use Google\Protobuf\UInt32Value;
+use Google\Protobuf\UInt64Value;
+use Google\Protobuf\Value;
+
+class NotMessage {}
+
+class WellKnownTest extends TestBase {
+
+    public function testEmpty()
+    {
+        $msg = new GPBEmpty();
+    }
+
+    public function testImportDescriptorProto()
+    {
+        $msg = new TestImportDescriptorProto();
+    }
+
+    public function testAny()
+    {
+        // Create embed message
+        $embed = new TestMessage();
+        $this->setFields($embed);
+        $data = $embed->serializeToString();
+
+        // Set any via normal setter.
+        $any = new Any();
+
+        $this->assertSame(
+            $any, $any->setTypeUrl("type.googleapis.com/foo.TestMessage"));
+        $this->assertSame("type.googleapis.com/foo.TestMessage",
+                          $any->getTypeUrl());
+
+        $this->assertSame($any, $any->setValue($data));
+        $this->assertSame($data, $any->getValue());
+
+        // Test unpack.
+        $msg = $any->unpack();
+        $this->assertTrue($msg instanceof TestMessage);
+        $this->expectFields($msg);
+
+        // Test pack.
+        $any = new Any();
+        $any->pack($embed);
+        $this->assertSame($data, $any->getValue());
+        $this->assertSame("type.googleapis.com/foo.TestMessage", $any->getTypeUrl());
+
+        // Test is.
+        $this->assertTrue($any->is(TestMessage::class));
+        $this->assertFalse($any->is(Any::class));
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testAnyUnpackInvalidTypeUrl()
+    {
+        $any = new Any();
+        $any->setTypeUrl("invalid");
+        $any->unpack();
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testAnyUnpackMessageNotAdded()
+    {
+        $any = new Any();
+        $any->setTypeUrl("type.googleapis.com/MessageNotAdded");
+        $any->unpack();
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testAnyUnpackDecodeError()
+    {
+        $any = new Any();
+        $any->setTypeUrl("type.googleapis.com/foo.TestMessage");
+        $any->setValue("abc");
+        $any->unpack();
+    }
+
+    public function testApi()
+    {
+        $m = new Api();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setMethods([new Method()]);
+        $this->assertSame(1, count($m->getMethods()));
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+
+        $m->setVersion("a");
+        $this->assertSame("a", $m->getVersion());
+
+        $m->setSourceContext(new SourceContext());
+        $this->assertFalse(is_null($m->getSourceContext()));
+
+        $m->setMixins([new Mixin()]);
+        $this->assertSame(1, count($m->getMixins()));
+
+        $m->setSyntax(Syntax::SYNTAX_PROTO2);
+        $this->assertSame(Syntax::SYNTAX_PROTO2, $m->getSyntax());
+
+        $m = new Method();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setRequestTypeUrl("a");
+        $this->assertSame("a", $m->getRequestTypeUrl());
+
+        $m->setRequestStreaming(true);
+        $this->assertSame(true, $m->getRequestStreaming());
+
+        $m->setResponseTypeUrl("a");
+        $this->assertSame("a", $m->getResponseTypeUrl());
+
+        $m->setResponseStreaming(true);
+        $this->assertSame(true, $m->getResponseStreaming());
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+
+        $m = new Mixin();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setRoot("a");
+        $this->assertSame("a", $m->getRoot());
+    }
+
+    public function testEnum()
+    {
+        $m = new Enum();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setEnumvalue([new EnumValue()]);
+        $this->assertSame(1, count($m->getEnumvalue()));
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+
+        $m->setSourceContext(new SourceContext());
+        $this->assertFalse(is_null($m->getSourceContext()));
+
+        $m->setSyntax(Syntax::SYNTAX_PROTO2);
+        $this->assertSame(Syntax::SYNTAX_PROTO2, $m->getSyntax());
+    }
+
+    public function testEnumValue()
+    {
+        $m = new EnumValue();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setNumber(1);
+        $this->assertSame(1, $m->getNumber());
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+    }
 
-class WellKnownTest extends PHPUnit_Framework_TestCase {
+    public function testField()
+    {
+        $m = new Field();
 
-    public function testNone() {
-      $msg = new GPBEmpty();
+        $m->setKind(Kind::TYPE_DOUBLE);
+        $this->assertSame(Kind::TYPE_DOUBLE, $m->getKind());
+
+        $m->setCardinality(Cardinality::CARDINALITY_OPTIONAL);
+        $this->assertSame(Cardinality::CARDINALITY_OPTIONAL, $m->getCardinality());
+
+        $m->setNumber(1);
+        $this->assertSame(1, $m->getNumber());
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setTypeUrl("a");
+        $this->assertSame("a", $m->getTypeUrl());
+
+        $m->setOneofIndex(1);
+        $this->assertSame(1, $m->getOneofIndex());
+
+        $m->setPacked(true);
+        $this->assertSame(true, $m->getPacked());
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+
+        $m->setJsonName("a");
+        $this->assertSame("a", $m->getJsonName());
+
+        $m->setDefaultValue("a");
+        $this->assertSame("a", $m->getDefaultValue());
+    }
+
+    public function testFieldMask()
+    {
+        $m = new FieldMask();
+        $m->setPaths(["a"]);
+        $this->assertSame(1, count($m->getPaths()));
+    }
+
+    public function testOption()
+    {
+        $m = new Option();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setValue(new Any());
+        $this->assertFalse(is_null($m->getValue()));
+    }
+
+    public function testSourceContext()
+    {
+        $m = new SourceContext();
+        $m->setFileName("a");
+        $this->assertSame("a", $m->getFileName());
+    }
+
+    public function testStruct()
+    {
+        $m = new ListValue();
+        $m->setValues([new Value()]);
+        $this->assertSame(1, count($m->getValues()));
+
+        $m = new Value();
+
+        $m->setNullValue(NullValue::NULL_VALUE);
+        $this->assertSame(NullValue::NULL_VALUE, $m->getNullValue());
+        $this->assertSame("null_value", $m->getKind());
+
+        $m->setNumberValue(1.0);
+        $this->assertSame(1.0, $m->getNumberValue());
+        $this->assertSame("number_value", $m->getKind());
+
+        $m->setStringValue("a");
+        $this->assertSame("a", $m->getStringValue());
+        $this->assertSame("string_value", $m->getKind());
+
+        $m->setBoolValue(true);
+        $this->assertSame(true, $m->getBoolValue());
+        $this->assertSame("bool_value", $m->getKind());
+
+        $m->setStructValue(new Struct());
+        $this->assertFalse(is_null($m->getStructValue()));
+        $this->assertSame("struct_value", $m->getKind());
+
+        $m->setListValue(new ListValue());
+        $this->assertFalse(is_null($m->getListValue()));
+        $this->assertSame("list_value", $m->getKind());
+
+        $m = new Struct();
+        $m->setFields(array("a"=>new Value()));
+        $this->assertSame(1, count($m->getFields()));
+    }
+
+    public function testTimestamp()
+    {
+        $timestamp = new Timestamp();
+
+        $timestamp->setSeconds(1);
+        $timestamp->setNanos(2);
+        $this->assertEquals(1, $timestamp->getSeconds());
+        $this->assertSame(2, $timestamp->getNanos());
+
+        date_default_timezone_set('UTC');
+        $from = new DateTime('2011-01-01T15:03:01.012345UTC');
+        $timestamp->fromDateTime($from);
+        $this->assertEquals($from->format('U'), $timestamp->getSeconds());
+        $this->assertSame(0, $timestamp->getNanos());
+
+        $to = $timestamp->toDateTime();
+        $this->assertSame(\DateTime::class, get_class($to));
+        $this->assertSame($from->format('U'), $to->format('U'));
+    }
+
+    public function testType()
+    {
+        $m = new Type();
+
+        $m->setName("a");
+        $this->assertSame("a", $m->getName());
+
+        $m->setFields([new Field()]);
+        $this->assertSame(1, count($m->getFields()));
+
+        $m->setOneofs(["a"]);
+        $this->assertSame(1, count($m->getOneofs()));
+
+        $m->setOptions([new Option()]);
+        $this->assertSame(1, count($m->getOptions()));
+
+        $m->setSourceContext(new SourceContext());
+        $this->assertFalse(is_null($m->getSourceContext()));
+
+        $m->setSyntax(Syntax::SYNTAX_PROTO2);
+        $this->assertSame(Syntax::SYNTAX_PROTO2, $m->getSyntax());
+    }
+
+    public function testDuration()
+    {
+        $duration = new Duration();
+
+        $duration->setSeconds(1);
+        $duration->setNanos(2);
+        $this->assertEquals(1, $duration->getSeconds());
+        $this->assertSame(2, $duration->getNanos());
     }
 
+    public function testWrappers()
+    {
+        $m = new DoubleValue();
+        $m->setValue(1.0);
+        $this->assertSame(1.0, $m->getValue());
+
+        $m = new FloatValue();
+        $m->setValue(1.0);
+        $this->assertSame(1.0, $m->getValue());
+
+        $m = new Int64Value();
+        $m->setValue(1);
+        $this->assertEquals(1, $m->getValue());
+
+        $m = new UInt64Value();
+        $m->setValue(1);
+        $this->assertEquals(1, $m->getValue());
+
+        $m = new Int32Value();
+        $m->setValue(1);
+        $this->assertSame(1, $m->getValue());
+
+        $m = new UInt32Value();
+        $m->setValue(1);
+        $this->assertSame(1, $m->getValue());
+
+        $m = new BoolValue();
+        $m->setValue(true);
+        $this->assertSame(true, $m->getValue());
+
+        $m = new StringValue();
+        $m->setValue("a");
+        $this->assertSame("a", $m->getValue());
+
+        $m = new BytesValue();
+        $m->setValue("a");
+        $this->assertSame("a", $m->getValue());
+    }
 }
diff --git a/post_process_dist.sh b/post_process_dist.sh
index a5f95800..eb5f584d 100755
--- a/post_process_dist.sh
+++ b/post_process_dist.sh
@@ -27,7 +27,7 @@ fi
 
 set -ex
 
-LANGUAGES="cpp csharp java javanano js objectivec python ruby php"
+LANGUAGES="cpp csharp java javanano js objectivec python ruby php all"
 BASENAME=`basename $1 .tar.gz`
 VERSION=${BASENAME:9}
 
diff --git a/protobuf.bzl b/protobuf.bzl
index 73c396d5..4226a142 100644
--- a/protobuf.bzl
+++ b/protobuf.bzl
@@ -45,8 +45,11 @@ def _CcSrcs(srcs, use_grpc_plugin=False):
 def _CcOuts(srcs, use_grpc_plugin=False):
   return _CcHdrs(srcs, use_grpc_plugin) + _CcSrcs(srcs, use_grpc_plugin)
 
-def _PyOuts(srcs):
-  return [s[:-len(".proto")] + "_pb2.py" for s in srcs]
+def _PyOuts(srcs, use_grpc_plugin=False):
+  ret = [s[:-len(".proto")] + "_pb2.py" for s in srcs]
+  if use_grpc_plugin:
+    ret += [s[:-len(".proto")] + "_pb2_grpc.py" for s in srcs]
+  return ret
 
 def _RelativeOutputPath(path, include, dest=""):
   if include == None:
@@ -108,6 +111,7 @@ def _proto_gen_impl(ctx):
         arguments=args + import_flags + [s.path for s in srcs],
         executable=ctx.executable.protoc,
         mnemonic="ProtoCompile",
+        use_default_shell_env=True,
     )
 
   return struct(
@@ -170,10 +174,10 @@ def cc_proto_library(
         deps=[],
         cc_libs=[],
         include=None,
-        protoc="//:protoc",
+        protoc="@com_google_protobuf//:protoc",
         internal_bootstrap_hack=False,
         use_grpc_plugin=False,
-        default_runtime="//:protobuf",
+        default_runtime="@com_google_protobuf//:protobuf",
         **kargs):
   """Bazel rule to create a C++ protobuf library from proto source files
 
@@ -244,9 +248,9 @@ def cc_proto_library(
   )
 
   if default_runtime and not default_runtime in cc_libs:
-    cc_libs += [default_runtime]
+    cc_libs = cc_libs + [default_runtime]
   if use_grpc_plugin:
-    cc_libs += ["//external:grpc_lib"]
+    cc_libs = cc_libs + ["//external:grpc_lib"]
 
   native.cc_library(
       name=name,
@@ -262,8 +266,8 @@ def internal_gen_well_known_protos_java(srcs):
   Args:
     srcs: the well known protos
   """
-  root = Label("%s//protobuf_java" % (REPOSITORY_NAME)).workspace_root
-  pkg = PACKAGE_NAME + "/" if PACKAGE_NAME else ""
+  root = Label("%s//protobuf_java" % (native.repository_name())).workspace_root
+  pkg = native.package_name() + "/" if native.package_name() else ""
   if root == "":
     include = " -I%ssrc " % pkg
   else:
@@ -316,8 +320,8 @@ def py_proto_library(
         py_libs=[],
         py_extra_srcs=[],
         include=None,
-        default_runtime="//:protobuf_python",
-        protoc="//:protoc",
+        default_runtime="@com_google_protobuf//:protobuf_python",
+        protoc="@com_google_protobuf//:protoc",
         use_grpc_plugin=False,
         **kargs):
   """Bazel rule to create a Python protobuf library from proto source files
@@ -343,7 +347,7 @@ def py_proto_library(
     **kargs: other keyword arguments that are passed to cc_library.
 
   """
-  outs = _PyOuts(srcs)
+  outs = _PyOuts(srcs, use_grpc_plugin)
 
   includes = []
   if include != None:
@@ -370,7 +374,7 @@ def py_proto_library(
   )
 
   if default_runtime and not default_runtime in py_libs + deps:
-    py_libs += [default_runtime]
+    py_libs = py_libs + [default_runtime]
 
   native.py_library(
       name=name,
@@ -399,3 +403,15 @@ def internal_protobuf_py_tests(
         srcs=[s],
         main=s,
         **kargs)
+
+
+def check_protobuf_required_bazel_version():
+  """For WORKSPACE files, to check the installed version of bazel.
+
+  This ensures bazel supports our approach to proto_library() depending on a
+  copied filegroup. (Fixed in bazel 0.5.4)
+  """
+  expected = apple_common.dotted_version("0.5.4")
+  current = apple_common.dotted_version(native.bazel_version)
+  if current.compare_to(expected) < 0:
+    fail("Bazel must be newer than 0.5.4")
diff --git a/protoc-artifacts/Dockerfile b/protoc-artifacts/Dockerfile
index 5143b028..c346586b 100644
--- a/protoc-artifacts/Dockerfile
+++ b/protoc-artifacts/Dockerfile
@@ -11,13 +11,16 @@ RUN yum install -y git \
                    libtool \
                    glibc-static.i686 \
                    glibc-devel \
-                   glibc-devel.i686
+                   glibc-devel.i686 \
+                   && \
+    yum clean all
 
 # Install Java 8
 RUN wget -q --no-cookies --no-check-certificate \
-    --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-x64.tar.gz" \
+    --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" \
+    "http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz" \
     -O - | tar xz -C /var/local
-ENV JAVA_HOME /var/local/jdk1.8.0_45
+ENV JAVA_HOME /var/local/jdk1.8.0_131
 ENV PATH $JAVA_HOME/bin:$PATH
 
 # Install Maven
@@ -26,15 +29,17 @@ RUN wget -q http://apache.cs.utah.edu/maven/maven-3/3.3.9/binaries/apache-maven-
 ENV PATH /var/local/apache-maven-3.3.9/bin:$PATH
 
 # Install GCC 4.7 to support -static-libstdc++
-RUN wget http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo -P /etc/yum.repos.d
-RUN bash -c 'echo "enabled=1" >> /etc/yum.repos.d/devtools-1.1.repo'
-RUN bash -c "sed -e 's/\$basearch/i386/g' /etc/yum.repos.d/devtools-1.1.repo > /etc/yum.repos.d/devtools-i386-1.1.repo"
-RUN sed -e 's/testing-/testing-i386-/g' -i /etc/yum.repos.d/devtools-i386-1.1.repo
-RUN yum install -y devtoolset-1.1 \
+RUN wget http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo -P /etc/yum.repos.d && \
+    bash -c 'echo "enabled=1" >> /etc/yum.repos.d/devtools-1.1.repo' && \
+    bash -c "sed -e 's/\$basearch/i386/g' /etc/yum.repos.d/devtools-1.1.repo > /etc/yum.repos.d/devtools-i386-1.1.repo" && \
+    sed -e 's/testing-/testing-i386-/g' -i /etc/yum.repos.d/devtools-i386-1.1.repo && \
+    rpm --rebuilddb && \
+    yum install -y devtoolset-1.1 \
                    devtoolset-1.1-libstdc++-devel \
-                   devtoolset-1.1-libstdc++-devel.i686
+                   devtoolset-1.1-libstdc++-devel.i686 && \
+    yum clean all
 
-RUN git clone --depth 1 https://github.com/google/protobuf.git
+COPY scl-enable-devtoolset.sh /var/local/
 
 # Start in devtoolset environment that uses GCC 4.7
-CMD ["scl", "enable", "devtoolset-1.1", "bash"]
+ENTRYPOINT ["/var/local/scl-enable-devtoolset.sh"]
diff --git a/protoc-artifacts/README.md b/protoc-artifacts/README.md
index 50629209..dcaec987 100644
--- a/protoc-artifacts/README.md
+++ b/protoc-artifacts/README.md
@@ -68,10 +68,11 @@ configure GPG and Sonatype account.
 You need to perform the deployment for every platform that you want to
 support. DO NOT close the staging repository until you have done the
 deployment for all platforms. Currently the following platforms are supported:
-- Linux (x86_32 and x86_64)
+- Linux (x86_32, x86_64 and cross compiled aarch_64)
 - Windows (x86_32 and x86_64) with
- - Cygwin64 with MinGW compilers (x86_64)
- - MSYS with MinGW32 (x86_32)
+  - Cygwin64 with MinGW compilers (x86_64)
+  - MSYS with MinGW32 (x86_32)
+  - Cross compile in Linux with MinGW-w64 (x86_32, x86_64)
 - MacOSX (x86_32 and x86_64)
 
 As for MSYS2/MinGW64 for Windows: protoc will build, but it insists on
@@ -98,6 +99,12 @@ $ mvn clean deploy -P release -Dstaging.repository=comgoogle-123
 A 32-bit artifact can be deployed from a 64-bit host with
 ``-Dos.detected.arch=x86_32``
 
+An arm64 artifact can be deployed from x86 host with
+``-Dos.detected.arch=aarch_64``
+
+A windows artifact can be deployed from a linux machine with
+``-Dos.detected.name=windows``
+
 When you have done deployment for all platforms, go to
 https://oss.sonatype.org/#stagingRepositories, verify that the staging
 repository has all the binaries, close and release this repository.
@@ -133,10 +140,14 @@ $ docker build -t protoc-artifacts .
 
 To run the image:
 ```
-$ docker run -it --rm=true protoc-artifacts
+$ docker run -it --rm=true protoc-artifacts bash
 ```
 
-The Protobuf repository has been cloned into ``/protobuf``.
+To checkout protobuf (run within the container):
+```
+$ # Replace v3.5.1 with the version you want
+$ wget -O - https://github.com/google/protobuf/archive/v3.5.1.tar.gz | tar xvzp
+```
 
 ### Tips for deploying on Windows
 Under Windows the following error may occur: ``gpg: cannot open tty `no tty':
@@ -170,8 +181,11 @@ stored:
 ### Tested build environments
 We have successfully built artifacts on the following environments:
 - Linux x86_32 and x86_64:
- - Centos 6.6 (within Docker 1.6.1)
- - Ubuntu 14.04.2 64-bit
+  - Centos 6.6 (within Docker 1.6.1)
+  - Ubuntu 14.04.2 64-bit
+- Linux aarch_64: Cross compiled with `g++-aarch64-linux-gnu` on Ubuntu 14.04.2 64-bit
 - Windows x86_32: MSYS with ``mingw32-gcc-g++ 4.8.1-4`` on Windows 7 64-bit
+- Windows x86_32: Cross compile with ``i686-w64-mingw32-g++ 4.8.2`` on Ubuntu 14.04.2 64-bit
 - Windows x86_64: Cygwin64 with ``mingw64-x86_64-gcc-g++ 4.8.3-1`` on Windows 7 64-bit
+- Windows x86_64: Cross compile with ``x86_64-w64-mingw32-g++ 4.8.2`` on Ubuntu 14.04.2 64-bit
 - Mac OS X x86_32 and x86_64: Mac OS X 10.9.5
diff --git a/protoc-artifacts/build-protoc.sh b/protoc-artifacts/build-protoc.sh
index e31948e9..b78abbcf 100755
--- a/protoc-artifacts/build-protoc.sh
+++ b/protoc-artifacts/build-protoc.sh
@@ -6,6 +6,12 @@
 # Usage: build-protoc.sh <OS> <ARCH> <TARGET>
 # <OS> and <ARCH> are ${os.detected.name} and ${os.detected.arch} from os-maven-plugin
 # <TARGET> can be "protoc" or "protoc-gen-javalite"
+#
+# The script now supports cross-compiling windows and linux-arm64 in linux-x86
+# environment. Required packages:
+# - Windows: i686-w64-mingw32-gcc (32bit) and x86_64-w64-mingw32-gcc (64bit)
+# - Arm64: g++-aarch64-linux-gnu
+
 OS=$1
 ARCH=$2
 MAKE_TARGET=$3
@@ -73,6 +79,10 @@ checkArch ()
         assertEq $format "elf32-i386" $LINENO
       elif [[ "$ARCH" == x86_64 ]]; then
         assertEq $format "elf64-x86-64" $LINENO
+      elif [[ "$ARCH" == aarch_64 ]]; then
+        assertEq $format "elf64-little" $LINENO
+      elif [[ "$ARCH" == ppcle_64 ]]; then
+        assertEq $format "elf64-powerpcle" $LINENO
       else
         fail "Unsupported arch: $ARCH"
       fi
@@ -116,6 +126,11 @@ checkDependencies ()
       white_list="linux-gate\.so\.1\|libpthread\.so\.0\|libm\.so\.6\|libc\.so\.6\|ld-linux\.so\.2"
     elif [[ "$ARCH" == x86_64 ]]; then
       white_list="linux-vdso\.so\.1\|libpthread\.so\.0\|libm\.so\.6\|libc\.so\.6\|ld-linux-x86-64\.so\.2"
+    elif [[ "$ARCH" == ppcle_64 ]]; then
+      white_list="linux-vdso64\.so\.1\|libpthread\.so\.0\|libm\.so\.6\|libc\.so\.6\|libz\.so\.1\|ld64\.so\.2"
+    elif [[ "$ARCH" == aarch_64 ]]; then
+      dump_cmd='objdump -p '"$1"' | grep NEEDED'
+      white_list="libpthread\.so\.0\|libc\.so\.6\|ld-linux-aarch64\.so\.1"
     fi
   elif [[ "$OS" == osx ]]; then
     dump_cmd='otool -L '"$1"' | fgrep dylib'
@@ -180,13 +195,15 @@ elif [[ "$(uname)" == Linux* ]]; then
       CXXFLAGS="$CXXFLAGS -m64"
     elif [[ "$ARCH" == x86_32 ]]; then
       CXXFLAGS="$CXXFLAGS -m32"
+    elif [[ "$ARCH" == aarch_64 ]]; then
+      CONFIGURE_ARGS="$CONFIGURE_ARGS --host=aarch64-linux-gnu"
+    elif [[ "$ARCH" == ppcle_64 ]]; then
+      CXXFLAGS="$CXXFLAGS -m64"
     else
       fail "Unsupported arch: $ARCH"
     fi
   elif [[ "$OS" == windows ]]; then
     # Cross-compilation for Windows
-    # TODO(zhangkun83) MinGW 64 always adds dependency on libwinpthread-1.dll,
-    # which is undesirable for repository deployment.
     CONFIGURE_ARGS="$CONFIGURE_ARGS"
     if [[ "$ARCH" == x86_64 ]]; then
       CONFIGURE_ARGS="$CONFIGURE_ARGS --host=x86_64-w64-mingw32"
@@ -215,8 +232,11 @@ fi
 
 # Statically link libgcc and libstdc++.
 # -s to produce stripped binary.
-# And they don't work under Mac.
-if [[ "$OS" != osx ]]; then
+if [[ "$OS" == windows ]]; then
+  # Also static link libpthread required by mingw64
+  LDFLAGS="$LDFLAGS -static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++ -lpthread -s"
+elif [[ "$OS" != osx ]]; then
+  # And they don't work under Mac.
   LDFLAGS="$LDFLAGS -static-libgcc -static-libstdc++ -s"
 fi
 
diff --git a/protoc-artifacts/build-zip.sh b/protoc-artifacts/build-zip.sh
index 3c5e887b..26b6cc93 100755
--- a/protoc-artifacts/build-zip.sh
+++ b/protoc-artifacts/build-zip.sh
@@ -13,12 +13,14 @@ Example:
 This script will download pre-built protoc or protoc plugin binaries from maven
 repository and create .zip packages suitable to be included in the github
 release page. If the target is protoc, well-known type .proto files will also be
-included. Each invocation will create 5 zip packages:
+included. Each invocation will create 7 zip packages:
   dist/<TARGET>-<VERSION_NUMBER>-win32.zip
   dist/<TARGET>-<VERSION_NUMBER>-osx-x86_32.zip
   dist/<TARGET>-<VERSION_NUMBER>-osx-x86_64.zip
   dist/<TARGET>-<VERSION_NUMBER>-linux-x86_32.zip
   dist/<TARGET>-<VERSION_NUMBER>-linux-x86_64.zip
+  dist/<TARGET>-<VERSION_NUMBER>-linux-aarch_64.zip
+  dist/<TARGET>-<VERSION_NUMBER>-linux-ppcle_64.zip
 EOF
   exit 1
 fi
@@ -33,6 +35,8 @@ declare -a FILE_NAMES=( \
   osx-x86_64.zip osx-x86_64.exe \
   linux-x86_32.zip linux-x86_32.exe \
   linux-x86_64.zip linux-x86_64.exe \
+  linux-aarch_64.zip linux-aarch_64.exe \
+  linux-ppcle_64.zip linux-ppcle_64.exe \
 )
 
 # List of all well-known types to be included.
@@ -73,6 +77,10 @@ compiler (protoc). This binary is intended for users who want to use Protocol
 Buffers in languages other than C++ but do not want to compile protoc
 themselves. To install, simply place this binary somewhere in your PATH.
 
+If you intend to use the included well known types then don't forget to
+copy the contents of the 'include' directory somewhere as well, for example
+into '/usr/local/include/'.
+
 Please refer to our official github site for more installation instructions:
   https://github.com/google/protobuf
 EOF
diff --git a/protoc-artifacts/pom.xml b/protoc-artifacts/pom.xml
index 28a25119..298730a6 100644
--- a/protoc-artifacts/pom.xml
+++ b/protoc-artifacts/pom.xml
@@ -10,7 +10,7 @@
   </parent>
   <groupId>com.google.protobuf</groupId>
   <artifactId>protoc</artifactId>
-  <version>3.2.0</version>
+  <version>3.5.2</version>
   <packaging>pom</packaging>
   <name>Protobuf Compiler</name>
   <description>
@@ -37,7 +37,7 @@
       <extension>
         <groupId>kr.motd.maven</groupId>
         <artifactId>os-maven-plugin</artifactId>
-        <version>1.2.3.Final</version>
+        <version>1.5.0.Final</version>
       </extension>
     </extensions>
     <plugins>
diff --git a/protoc-artifacts/scl-enable-devtoolset.sh b/protoc-artifacts/scl-enable-devtoolset.sh
new file mode 100755
index 00000000..8d9585ea
--- /dev/null
+++ b/protoc-artifacts/scl-enable-devtoolset.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+set -eu -o pipefail
+
+quote() {
+  local arg
+  for arg in "$@"; do
+    printf "'"
+    printf "%s" "$arg" | sed -e "s/'/'\\\\''/g"
+    printf "' "
+  done
+}
+
+exec scl enable devtoolset-1.1 "$(quote "$@")"
diff --git a/python/MANIFEST.in b/python/MANIFEST.in
index 26088826..5fb01922 100644
--- a/python/MANIFEST.in
+++ b/python/MANIFEST.in
@@ -4,6 +4,9 @@ exclude google/protobuf/internal/*_test.py
 exclude google/protobuf/internal/*.proto
 exclude google/protobuf/internal/test_util.py
 
+recursive-include google *.cc
+recursive-include google *.h
+
 recursive-exclude google *_test.py
 recursive-exclude google *_test.proto
 recursive-exclude google unittest*_pb2.py
diff --git a/python/README.md b/python/README.md
index 8f3db785..4c194297 100644
--- a/python/README.md
+++ b/python/README.md
@@ -32,77 +32,84 @@ Installation
 
 1) Make sure you have Python 2.6 or newer.  If in doubt, run:
 
-     $ python -V
+       $ python -V
 
 2) If you do not have setuptools installed, note that it will be
-   downloaded and installed automatically as soon as you run setup.py.
+   downloaded and installed automatically as soon as you run `setup.py`.
    If you would rather install it manually, you may do so by following
-   the instructions on this page:
+   the instructions on [this page](https://packaging.python.org/en/latest/installing.html#setup-for-installing-packages).
 
-     https://packaging.python.org/en/latest/installing.html#setup-for-installing-packages
-
-3) Build the C++ code, or install a binary distribution of protoc.  If
+3) Build the C++ code, or install a binary distribution of `protoc`.  If
    you install a binary distribution, make sure that it is the same
    version as this package.  If in doubt, run:
 
-     $ protoc --version
+       $ protoc --version
 
 4) Build and run the tests:
 
-     $ python setup.py build
-     $ python setup.py test
+       $ python setup.py build
+       $ python setup.py test
+
+   To build, test, and use the C++ implementation, you must first compile
+   `libprotobuf.so`:
+
+       $ (cd .. && make)
+
+   On OS X:
+
+   If you are running a Homebrew-provided Python, you must make sure another
+   version of protobuf is not already installed, as Homebrew's Python will
+   search `/usr/local/lib` for `libprotobuf.so` before it searches
+   `../src/.libs`.
 
-     To build, test, and use the C++ implementation, you must first compile
-     libprotobuf.so:
+   You can either unlink Homebrew's protobuf or install the `libprotobuf` you
+   built earlier:
 
-     $ (cd .. && make)
+       $ brew unlink protobuf
 
-     On OS X:
+   or
 
-      If you are running a homebrew-provided python, you must make sure another
-      version of protobuf is not already installed, as homebrew's python will
-      search /usr/local/lib for libprotobuf.so before it searches ../src/.libs
-      You can either unlink homebrew's protobuf or install the libprotobuf you
-      built earlier:
+       $ (cd .. && make install)
 
-      $ brew unlink protobuf
-      or
-      $ (cd .. && make install)
+    On other *nix:
 
-     On other *nix:
+    You must make `libprotobuf.so` dynamically available. You can either
+    install libprotobuf you built earlier, or set `LD_LIBRARY_PATH`:
 
-      You must make libprotobuf.so dynamically available. You can either
-      install libprotobuf you built earlier, or set LD_LIBRARY_PATH:
+       $ export LD_LIBRARY_PATH=../src/.libs
 
-      $ export LD_LIBRARY_PATH=../src/.libs
-      or
-      $ (cd .. && make install)
+    or
 
-     To build the C++ implementation run:
-     $ python setup.py build --cpp_implementation
+       $ (cd .. && make install)
 
-     Then run the tests like so:
-     $ python setup.py test --cpp_implementation
+   To build the C++ implementation run:
+
+       $ python setup.py build --cpp_implementation
+
+   Then run the tests like so:
+
+       $ python setup.py test --cpp_implementation
 
    If some tests fail, this library may not work correctly on your
    system.  Continue at your own risk.
 
    Please note that there is a known problem with some versions of
    Python on Cygwin which causes the tests to fail after printing the
-   error:  "sem_init: Resource temporarily unavailable".  This appears
-   to be a bug either in Cygwin or in Python:
-     http://www.cygwin.com/ml/cygwin/2005-07/msg01378.html
+   error:  `sem_init: Resource temporarily unavailable`.  This appears
+   to be a [bug either in Cygwin or in
+   Python](http://www.cygwin.com/ml/cygwin/2005-07/msg01378.html).
+
    We do not know if or when it might be fixed.  We also do not know
    how likely it is that this bug will affect users in practice.
 
 5) Install:
 
-    $ python setup.py install
+       $ python setup.py install
 
-  or:
+   or:
 
-    $ (cd .. && make install)
-    $ python setup.py install --cpp_implementation
+       $ (cd .. && make install)
+       $ python setup.py install --cpp_implementation
 
    This step may require superuser privileges.
    NOTE: To use C++ implementation, you need to export an environment
diff --git a/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/message_test.py b/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/message_test.py
index 53e9d507..e71b295b 100755
--- a/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/message_test.py
+++ b/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/message_test.py
@@ -55,6 +55,11 @@ from google.protobuf.internal import api_implementation
 from google.protobuf.internal import test_util
 from google.protobuf import message
 
+try:
+  cmp                                   # Python 2
+except NameError:
+  cmp = lambda x, y: (x > y) - (x < y)  # Python 3
+
 # Python pre-2.6 does not have isinf() or isnan() functions, so we have
 # to provide our own.
 def isnan(val):
diff --git a/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/text_format_test.py b/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/text_format_test.py
index 6bf7befb..8267cd2c 100755
--- a/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/text_format_test.py
+++ b/python/compatibility_tests/v2.5.0/tests/google/protobuf/internal/text_format_test.py
@@ -370,9 +370,8 @@ class TextFormatTest(unittest.TestCase):
   def testMergeBadExtension(self):
     message = unittest_pb2.TestAllExtensions()
     text = '[unknown_extension]: 8\n'
-    self.assertRaisesWithMessage(
+    self.assertRaises(
         text_format.ParseError,
-        '1:2 : Extension "unknown_extension" not registered.',
         text_format.Merge, text, message)
     message = unittest_pb2.TestAllTypes()
     self.assertRaisesWithMessage(
diff --git a/python/google/protobuf/__init__.py b/python/google/protobuf/__init__.py
index 7fd9e5a4..d4360727 100755
--- a/python/google/protobuf/__init__.py
+++ b/python/google/protobuf/__init__.py
@@ -30,7 +30,7 @@
 
 # Copyright 2007 Google Inc. All Rights Reserved.
 
-__version__ = '3.2.0'
+__version__ = '3.5.2'
 
 if __name__ != '__main__':
   try:
diff --git a/python/google/protobuf/compiler/__init__.py b/python/google/protobuf/compiler/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/python/google/protobuf/compiler/__init__.py
diff --git a/python/google/protobuf/descriptor.py b/python/google/protobuf/descriptor.py
index e1f2e3b7..8a9ba3da 100755
--- a/python/google/protobuf/descriptor.py
+++ b/python/google/protobuf/descriptor.py
@@ -34,6 +34,7 @@ file, in types that make this information accessible in Python.
 
 __author__ = 'robinson@google.com (Will Robinson)'
 
+import threading
 import six
 
 from google.protobuf.internal import api_implementation
@@ -41,8 +42,8 @@ from google.protobuf.internal import api_implementation
 _USE_C_DESCRIPTORS = False
 if api_implementation.Type() == 'cpp':
   # Used by MakeDescriptor in cpp mode
+  import binascii
   import os
-  import uuid
   from google.protobuf.pyext import _message
   _USE_C_DESCRIPTORS = getattr(_message, '_USE_C_DESCRIPTORS', False)
 
@@ -72,6 +73,24 @@ else:
   DescriptorMetaclass = type
 
 
+class _Lock(object):
+  """Wrapper class of threading.Lock(), which is allowed by 'with'."""
+
+  def __new__(cls):
+    self = object.__new__(cls)
+    self._lock = threading.Lock()  # pylint: disable=protected-access
+    return self
+
+  def __enter__(self):
+    self._lock.acquire()
+
+  def __exit__(self, exc_type, exc_value, exc_tb):
+    self._lock.release()
+
+
+_lock = threading.Lock()
+
+
 class DescriptorBase(six.with_metaclass(DescriptorMetaclass)):
 
   """Descriptors base class.
@@ -92,16 +111,17 @@ class DescriptorBase(six.with_metaclass(DescriptorMetaclass)):
     # subclasses" of this descriptor class.
     _C_DESCRIPTOR_CLASS = ()
 
-  def __init__(self, options, options_class_name):
+  def __init__(self, options, serialized_options, options_class_name):
     """Initialize the descriptor given its options message and the name of the
     class of the options message. The name of the class is required in case
     the options message is None and has to be created.
     """
     self._options = options
     self._options_class_name = options_class_name
+    self._serialized_options = serialized_options
 
     # Does this descriptor have non-default options?
-    self.has_options = options is not None
+    self.has_options = (options is not None) or (serialized_options is not None)
 
   def _SetOptions(self, options, options_class_name):
     """Sets the descriptor's options
@@ -123,14 +143,23 @@ class DescriptorBase(six.with_metaclass(DescriptorMetaclass)):
     """
     if self._options:
       return self._options
+
     from google.protobuf import descriptor_pb2
     try:
-      options_class = getattr(descriptor_pb2, self._options_class_name)
+      options_class = getattr(descriptor_pb2,
+                              self._options_class_name)
     except AttributeError:
       raise RuntimeError('Unknown options class name %s!' %
                          (self._options_class_name))
-    self._options = options_class()
-    return self._options
+
+    with _lock:
+      if self._serialized_options is None:
+        self._options = options_class()
+      else:
+        self._options = _ParseOptions(options_class(),
+                                      self._serialized_options)
+
+      return self._options
 
 
 class _NestedDescriptorBase(DescriptorBase):
@@ -138,7 +167,7 @@ class _NestedDescriptorBase(DescriptorBase):
 
   def __init__(self, options, options_class_name, name, full_name,
                file, containing_type, serialized_start=None,
-               serialized_end=None):
+               serialized_end=None, serialized_options=None):
     """Constructor.
 
     Args:
@@ -157,9 +186,10 @@ class _NestedDescriptorBase(DescriptorBase):
         file.serialized_pb that describes this descriptor.
       serialized_end: The end index (exclusive) in block in the
         file.serialized_pb that describes this descriptor.
+      serialized_options: Protocol message serilized options or None.
     """
     super(_NestedDescriptorBase, self).__init__(
-        options, options_class_name)
+        options, serialized_options, options_class_name)
 
     self.name = name
     # TODO(falk): Add function to calculate full_name instead of having it in
@@ -250,6 +280,7 @@ class Descriptor(_NestedDescriptorBase):
 
     def __new__(cls, name, full_name, filename, containing_type, fields,
                 nested_types, enum_types, extensions, options=None,
+                serialized_options=None,
                 is_extendable=True, extension_ranges=None, oneofs=None,
                 file=None, serialized_start=None, serialized_end=None,  # pylint: disable=redefined-builtin
                 syntax=None):
@@ -261,6 +292,7 @@ class Descriptor(_NestedDescriptorBase):
   # name of the argument.
   def __init__(self, name, full_name, filename, containing_type, fields,
                nested_types, enum_types, extensions, options=None,
+               serialized_options=None,
                is_extendable=True, extension_ranges=None, oneofs=None,
                file=None, serialized_start=None, serialized_end=None,  # pylint: disable=redefined-builtin
                syntax=None):
@@ -273,7 +305,7 @@ class Descriptor(_NestedDescriptorBase):
     super(Descriptor, self).__init__(
         options, 'MessageOptions', name, full_name, file,
         containing_type, serialized_start=serialized_start,
-        serialized_end=serialized_end)
+        serialized_end=serialized_end, serialized_options=serialized_options)
 
     # We have fields in addition to fields_by_name and fields_by_number,
     # so that:
@@ -406,6 +438,8 @@ class FieldDescriptor(DescriptorBase):
 
     containing_oneof: (OneofDescriptor) If the field is a member of a oneof
       union, contains its descriptor. Otherwise, None.
+
+    file: (FileDescriptor) Reference to file descriptor.
   """
 
   # Must be consistent with C++ FieldDescriptor::Type enum in
@@ -490,7 +524,9 @@ class FieldDescriptor(DescriptorBase):
     def __new__(cls, name, full_name, index, number, type, cpp_type, label,
                 default_value, message_type, enum_type, containing_type,
                 is_extension, extension_scope, options=None,
-                has_default_value=True, containing_oneof=None, json_name=None):
+                serialized_options=None,
+                has_default_value=True, containing_oneof=None, json_name=None,
+                file=None):  # pylint: disable=redefined-builtin
       _message.Message._CheckCalledFromGeneratedFile()
       if is_extension:
         return _message.default_pool.FindExtensionByName(full_name)
@@ -500,7 +536,9 @@ class FieldDescriptor(DescriptorBase):
   def __init__(self, name, full_name, index, number, type, cpp_type, label,
                default_value, message_type, enum_type, containing_type,
                is_extension, extension_scope, options=None,
-               has_default_value=True, containing_oneof=None, json_name=None):
+               serialized_options=None,
+               has_default_value=True, containing_oneof=None, json_name=None,
+               file=None):  # pylint: disable=redefined-builtin
     """The arguments are as described in the description of FieldDescriptor
     attributes above.
 
@@ -508,9 +546,11 @@ class FieldDescriptor(DescriptorBase):
     (to deal with circular references between message types, for example).
     Likewise for extension_scope.
     """
-    super(FieldDescriptor, self).__init__(options, 'FieldOptions')
+    super(FieldDescriptor, self).__init__(
+        options, serialized_options, 'FieldOptions')
     self.name = name
     self.full_name = full_name
+    self.file = file
     self._camelcase_name = None
     if json_name is None:
       self.json_name = _ToJsonName(name)
@@ -593,13 +633,15 @@ class EnumDescriptor(_NestedDescriptorBase):
     _C_DESCRIPTOR_CLASS = _message.EnumDescriptor
 
     def __new__(cls, name, full_name, filename, values,
-                containing_type=None, options=None, file=None,
+                containing_type=None, options=None,
+                serialized_options=None, file=None,  # pylint: disable=redefined-builtin
                 serialized_start=None, serialized_end=None):
       _message.Message._CheckCalledFromGeneratedFile()
       return _message.default_pool.FindEnumTypeByName(full_name)
 
   def __init__(self, name, full_name, filename, values,
-               containing_type=None, options=None, file=None,
+               containing_type=None, options=None,
+               serialized_options=None, file=None,  # pylint: disable=redefined-builtin
                serialized_start=None, serialized_end=None):
     """Arguments are as described in the attribute description above.
 
@@ -609,7 +651,7 @@ class EnumDescriptor(_NestedDescriptorBase):
     super(EnumDescriptor, self).__init__(
         options, 'EnumOptions', name, full_name, file,
         containing_type, serialized_start=serialized_start,
-        serialized_end=serialized_end)
+        serialized_end=serialized_end, serialized_options=serialized_options)
 
     self.values = values
     for value in self.values:
@@ -645,7 +687,9 @@ class EnumValueDescriptor(DescriptorBase):
   if _USE_C_DESCRIPTORS:
     _C_DESCRIPTOR_CLASS = _message.EnumValueDescriptor
 
-    def __new__(cls, name, index, number, type=None, options=None):
+    def __new__(cls, name, index, number,
+                type=None,  # pylint: disable=redefined-builtin
+                options=None, serialized_options=None):
       _message.Message._CheckCalledFromGeneratedFile()
       # There is no way we can build a complete EnumValueDescriptor with the
       # given parameters (the name of the Enum is not known, for example).
@@ -653,9 +697,12 @@ class EnumValueDescriptor(DescriptorBase):
       # constructor, which will ignore it, so returning None is good enough.
       return None
 
-  def __init__(self, name, index, number, type=None, options=None):
+  def __init__(self, name, index, number,
+               type=None,  # pylint: disable=redefined-builtin
+               options=None, serialized_options=None):
     """Arguments are as described in the attribute description above."""
-    super(EnumValueDescriptor, self).__init__(options, 'EnumValueOptions')
+    super(EnumValueDescriptor, self).__init__(
+        options, serialized_options, 'EnumValueOptions')
     self.name = name
     self.index = index
     self.number = number
@@ -680,14 +727,17 @@ class OneofDescriptor(DescriptorBase):
     _C_DESCRIPTOR_CLASS = _message.OneofDescriptor
 
     def __new__(
-        cls, name, full_name, index, containing_type, fields, options=None):
+        cls, name, full_name, index, containing_type, fields, options=None,
+        serialized_options=None):
       _message.Message._CheckCalledFromGeneratedFile()
       return _message.default_pool.FindOneofByName(full_name)
 
   def __init__(
-      self, name, full_name, index, containing_type, fields, options=None):
+      self, name, full_name, index, containing_type, fields, options=None,
+      serialized_options=None):
     """Arguments are as described in the attribute description above."""
-    super(OneofDescriptor, self).__init__(options, 'OneofOptions')
+    super(OneofDescriptor, self).__init__(
+        options, serialized_options, 'OneofOptions')
     self.name = name
     self.full_name = full_name
     self.index = index
@@ -716,17 +766,19 @@ class ServiceDescriptor(_NestedDescriptorBase):
   if _USE_C_DESCRIPTORS:
     _C_DESCRIPTOR_CLASS = _message.ServiceDescriptor
 
-    def __new__(cls, name, full_name, index, methods, options=None, file=None,  # pylint: disable=redefined-builtin
+    def __new__(cls, name, full_name, index, methods, options=None,
+                serialized_options=None, file=None,  # pylint: disable=redefined-builtin
                 serialized_start=None, serialized_end=None):
       _message.Message._CheckCalledFromGeneratedFile()  # pylint: disable=protected-access
       return _message.default_pool.FindServiceByName(full_name)
 
-  def __init__(self, name, full_name, index, methods, options=None, file=None,
+  def __init__(self, name, full_name, index, methods, options=None,
+               serialized_options=None, file=None,  # pylint: disable=redefined-builtin
                serialized_start=None, serialized_end=None):
     super(ServiceDescriptor, self).__init__(
         options, 'ServiceOptions', name, full_name, file,
         None, serialized_start=serialized_start,
-        serialized_end=serialized_end)
+        serialized_end=serialized_end, serialized_options=serialized_options)
     self.index = index
     self.methods = methods
     self.methods_by_name = dict((m.name, m) for m in methods)
@@ -767,18 +819,19 @@ class MethodDescriptor(DescriptorBase):
     _C_DESCRIPTOR_CLASS = _message.MethodDescriptor
 
     def __new__(cls, name, full_name, index, containing_service,
-                input_type, output_type, options=None):
+                input_type, output_type, options=None, serialized_options=None):
       _message.Message._CheckCalledFromGeneratedFile()  # pylint: disable=protected-access
       return _message.default_pool.FindMethodByName(full_name)
 
   def __init__(self, name, full_name, index, containing_service,
-               input_type, output_type, options=None):
+               input_type, output_type, options=None, serialized_options=None):
     """The arguments are as described in the description of MethodDescriptor
     attributes above.
 
     Note that containing_service may be None, and may be set later if necessary.
     """
-    super(MethodDescriptor, self).__init__(options, 'MethodOptions')
+    super(MethodDescriptor, self).__init__(
+        options, serialized_options, 'MethodOptions')
     self.name = name
     self.full_name = full_name
     self.index = index
@@ -813,7 +866,8 @@ class FileDescriptor(DescriptorBase):
   if _USE_C_DESCRIPTORS:
     _C_DESCRIPTOR_CLASS = _message.FileDescriptor
 
-    def __new__(cls, name, package, options=None, serialized_pb=None,
+    def __new__(cls, name, package, options=None,
+                serialized_options=None, serialized_pb=None,
                 dependencies=None, public_dependencies=None,
                 syntax=None, pool=None):
       # FileDescriptor() is called from various places, not only from generated
@@ -825,11 +879,13 @@ class FileDescriptor(DescriptorBase):
       else:
         return super(FileDescriptor, cls).__new__(cls)
 
-  def __init__(self, name, package, options=None, serialized_pb=None,
+  def __init__(self, name, package, options=None,
+               serialized_options=None, serialized_pb=None,
                dependencies=None, public_dependencies=None,
                syntax=None, pool=None):
     """Constructor."""
-    super(FileDescriptor, self).__init__(options, 'FileOptions')
+    super(FileDescriptor, self).__init__(
+        options, serialized_options, 'FileOptions')
 
     if pool is None:
       from google.protobuf import descriptor_pool
@@ -947,7 +1003,7 @@ def MakeDescriptor(desc_proto, package='', build_file_if_cpp=True,
     # imported ones. We need to specify a file name so the descriptor pool
     # accepts our FileDescriptorProto, but it is not important what that file
     # name is actually set to.
-    proto_name = str(uuid.uuid4())
+    proto_name = binascii.hexlify(os.urandom(16)).decode('ascii')
 
     if package:
       file_descriptor_proto.name = os.path.join(package.replace('.', '/'),
diff --git a/python/google/protobuf/descriptor_database.py b/python/google/protobuf/descriptor_database.py
index 1333f996..8b7715cd 100644
--- a/python/google/protobuf/descriptor_database.py
+++ b/python/google/protobuf/descriptor_database.py
@@ -32,6 +32,8 @@
 
 __author__ = 'matthewtoia@google.com (Matt Toia)'
 
+import warnings
+
 
 class Error(Exception):
   pass
@@ -54,9 +56,9 @@ class DescriptorDatabase(object):
     Args:
       file_desc_proto: The FileDescriptorProto to add.
     Raises:
-      DescriptorDatabaseException: if an attempt is made to add a proto
-        with the same name but different definition than an exisiting
-        proto in the database.
+      DescriptorDatabaseConflictingDefinitionError: if an attempt is made to
+        add a proto with the same name but different definition than an
+        exisiting proto in the database.
     """
     proto_name = file_desc_proto.name
     if proto_name not in self._file_desc_protos_by_file:
@@ -64,18 +66,20 @@ class DescriptorDatabase(object):
     elif self._file_desc_protos_by_file[proto_name] != file_desc_proto:
       raise DescriptorDatabaseConflictingDefinitionError(
           '%s already added, but with different descriptor.' % proto_name)
+    else:
+      return
 
-    # Add the top-level Message, Enum and Extension descriptors to the index.
+    # Add all the top-level descriptors to the index.
     package = file_desc_proto.package
     for message in file_desc_proto.message_type:
-      self._file_desc_protos_by_symbol.update(
-          (name, file_desc_proto) for name in _ExtractSymbols(message, package))
+      for name in _ExtractSymbols(message, package):
+        self._AddSymbol(name, file_desc_proto)
     for enum in file_desc_proto.enum_type:
-      self._file_desc_protos_by_symbol[
-          '.'.join((package, enum.name))] = file_desc_proto
+      self._AddSymbol(('.'.join((package, enum.name))), file_desc_proto)
     for extension in file_desc_proto.extension:
-      self._file_desc_protos_by_symbol[
-          '.'.join((package, extension.name))] = file_desc_proto
+      self._AddSymbol(('.'.join((package, extension.name))), file_desc_proto)
+    for service in file_desc_proto.service:
+      self._AddSymbol(('.'.join((package, service.name))), file_desc_proto)
 
   def FindFileByName(self, name):
     """Finds the file descriptor proto by file name.
@@ -104,6 +108,7 @@ class DescriptorDatabase(object):
 
     'some.package.name.Message'
     'some.package.name.Message.NestedEnum'
+    'some.package.name.Message.some_field'
 
     The file descriptor proto containing the specified symbol must be added to
     this database using the Add method or else an error will be raised.
@@ -117,8 +122,25 @@ class DescriptorDatabase(object):
     Raises:
       KeyError if no file contains the specified symbol.
     """
-
-    return self._file_desc_protos_by_symbol[symbol]
+    try:
+      return self._file_desc_protos_by_symbol[symbol]
+    except KeyError:
+      # Fields, enum values, and nested extensions are not in
+      # _file_desc_protos_by_symbol. Try to find the top level
+      # descriptor. Non-existent nested symbol under a valid top level
+      # descriptor can also be found. The behavior is the same with
+      # protobuf C++.
+      top_level, _, _ = symbol.rpartition('.')
+      return self._file_desc_protos_by_symbol[top_level]
+
+  def _AddSymbol(self, name, file_desc_proto):
+    if name in self._file_desc_protos_by_symbol:
+      warn_msg = ('Conflict register for file "' + file_desc_proto.name +
+                  '": ' + name +
+                  ' is already defined in file "' +
+                  self._file_desc_protos_by_symbol[name].name + '"')
+      warnings.warn(warn_msg, RuntimeWarning)
+    self._file_desc_protos_by_symbol[name] = file_desc_proto
 
 
 def _ExtractSymbols(desc_proto, package):
@@ -131,8 +153,7 @@ def _ExtractSymbols(desc_proto, package):
   Yields:
     The fully qualified name found in the descriptor.
   """
-
-  message_name = '.'.join((package, desc_proto.name))
+  message_name = package + '.' + desc_proto.name if package else desc_proto.name
   yield message_name
   for nested_type in desc_proto.nested_type:
     for symbol in _ExtractSymbols(nested_type, message_name):
diff --git a/python/google/protobuf/descriptor_pool.py b/python/google/protobuf/descriptor_pool.py
index fc3a7f44..8983f76f 100644
--- a/python/google/protobuf/descriptor_pool.py
+++ b/python/google/protobuf/descriptor_pool.py
@@ -58,6 +58,7 @@ directly instead of this class.
 __author__ = 'matthewtoia@google.com (Matt Toia)'
 
 import collections
+import warnings
 
 from google.protobuf import descriptor
 from google.protobuf import descriptor_database
@@ -124,14 +125,41 @@ class DescriptorPool(object):
     self._descriptor_db = descriptor_db
     self._descriptors = {}
     self._enum_descriptors = {}
+    self._service_descriptors = {}
     self._file_descriptors = {}
     self._toplevel_extensions = {}
+    # TODO(jieluo): Remove _file_desc_by_toplevel_extension after
+    # maybe year 2020 for compatibility issue (with 3.4.1 only).
+    self._file_desc_by_toplevel_extension = {}
     # We store extensions in two two-level mappings: The first key is the
     # descriptor of the message being extended, the second key is the extension
     # full name or its tag number.
     self._extensions_by_name = collections.defaultdict(dict)
     self._extensions_by_number = collections.defaultdict(dict)
 
+  def _CheckConflictRegister(self, desc):
+    """Check if the descriptor name conflicts with another of the same name.
+
+    Args:
+      desc: Descriptor of a message, enum, service or extension.
+    """
+    desc_name = desc.full_name
+    for register, descriptor_type in [
+        (self._descriptors, descriptor.Descriptor),
+        (self._enum_descriptors, descriptor.EnumDescriptor),
+        (self._service_descriptors, descriptor.ServiceDescriptor),
+        (self._toplevel_extensions, descriptor.FieldDescriptor)]:
+      if desc_name in register:
+        file_name = register[desc_name].file.name
+        if not isinstance(desc, descriptor_type) or (
+            file_name != desc.file.name):
+          warn_msg = ('Conflict register for file "' + desc.file.name +
+                      '": ' + desc_name +
+                      ' is already defined in file "' +
+                      file_name + '"')
+          warnings.warn(warn_msg, RuntimeWarning)
+        return
+
   def Add(self, file_desc_proto):
     """Adds the FileDescriptorProto and its types to this pool.
 
@@ -168,13 +196,15 @@ class DescriptorPool(object):
     if not isinstance(desc, descriptor.Descriptor):
       raise TypeError('Expected instance of descriptor.Descriptor.')
 
+    self._CheckConflictRegister(desc)
+
     self._descriptors[desc.full_name] = desc
-    self.AddFileDescriptor(desc.file)
+    self._AddFileDescriptor(desc.file)
 
   def AddEnumDescriptor(self, enum_desc):
     """Adds an EnumDescriptor to the pool.
 
-    This method also registers the FileDescriptor associated with the message.
+    This method also registers the FileDescriptor associated with the enum.
 
     Args:
       enum_desc: An EnumDescriptor.
@@ -183,8 +213,22 @@ class DescriptorPool(object):
     if not isinstance(enum_desc, descriptor.EnumDescriptor):
       raise TypeError('Expected instance of descriptor.EnumDescriptor.')
 
+    self._CheckConflictRegister(enum_desc)
     self._enum_descriptors[enum_desc.full_name] = enum_desc
-    self.AddFileDescriptor(enum_desc.file)
+    self._AddFileDescriptor(enum_desc.file)
+
+  def AddServiceDescriptor(self, service_desc):
+    """Adds a ServiceDescriptor to the pool.
+
+    Args:
+      service_desc: A ServiceDescriptor.
+    """
+
+    if not isinstance(service_desc, descriptor.ServiceDescriptor):
+      raise TypeError('Expected instance of descriptor.ServiceDescriptor.')
+
+    self._CheckConflictRegister(service_desc)
+    self._service_descriptors[service_desc.full_name] = service_desc
 
   def AddExtensionDescriptor(self, extension):
     """Adds a FieldDescriptor describing an extension to the pool.
@@ -203,6 +247,7 @@ class DescriptorPool(object):
       raise TypeError('Expected an extension descriptor.')
 
     if extension.extension_scope is None:
+      self._CheckConflictRegister(extension)
       self._toplevel_extensions[extension.full_name] = extension
 
     try:
@@ -238,6 +283,24 @@ class DescriptorPool(object):
       file_desc: A FileDescriptor.
     """
 
+    self._AddFileDescriptor(file_desc)
+    # TODO(jieluo): This is a temporary solution for FieldDescriptor.file.
+    # FieldDescriptor.file is added in code gen. Remove this solution after
+    # maybe 2020 for compatibility reason (with 3.4.1 only).
+    for extension in file_desc.extensions_by_name.values():
+      self._file_desc_by_toplevel_extension[
+          extension.full_name] = file_desc
+
+  def _AddFileDescriptor(self, file_desc):
+    """Adds a FileDescriptor to the pool, non-recursively.
+
+    If the FileDescriptor contains messages or enums, the caller must explicitly
+    register them.
+
+    Args:
+      file_desc: A FileDescriptor.
+    """
+
     if not isinstance(file_desc, descriptor.FileDescriptor):
       raise TypeError('Expected instance of descriptor.FileDescriptor.')
     self._file_descriptors[file_desc.name] = file_desc
@@ -252,7 +315,7 @@ class DescriptorPool(object):
       A FileDescriptor for the named file.
 
     Raises:
-      KeyError: if the file can not be found in the pool.
+      KeyError: if the file cannot be found in the pool.
     """
 
     try:
@@ -281,7 +344,7 @@ class DescriptorPool(object):
       A FileDescriptor that contains the specified symbol.
 
     Raises:
-      KeyError: if the file can not be found in the pool.
+      KeyError: if the file cannot be found in the pool.
     """
 
     symbol = _NormalizeFullyQualifiedName(symbol)
@@ -296,15 +359,28 @@ class DescriptorPool(object):
       pass
 
     try:
-      file_proto = self._internal_db.FindFileContainingSymbol(symbol)
-    except KeyError as error:
-      if self._descriptor_db:
-        file_proto = self._descriptor_db.FindFileContainingSymbol(symbol)
-      else:
-        raise error
-    if not file_proto:
+      return self._service_descriptors[symbol].file
+    except KeyError:
+      pass
+
+    try:
+      return self._FindFileContainingSymbolInDb(symbol)
+    except KeyError:
+      pass
+
+    try:
+      return self._file_desc_by_toplevel_extension[symbol]
+    except KeyError:
+      pass
+
+    # Try nested extensions inside a message.
+    message_name, _, extension_name = symbol.rpartition('.')
+    try:
+      message = self.FindMessageTypeByName(message_name)
+      assert message.extensions_by_name[extension_name]
+      return message.file
+    except KeyError:
       raise KeyError('Cannot find a file containing %s' % symbol)
-    return self._ConvertFileProtoToFileDescriptor(file_proto)
 
   def FindMessageTypeByName(self, full_name):
     """Loads the named descriptor from the pool.
@@ -314,11 +390,14 @@ class DescriptorPool(object):
 
     Returns:
       The descriptor for the named type.
+
+    Raises:
+      KeyError: if the message cannot be found in the pool.
     """
 
     full_name = _NormalizeFullyQualifiedName(full_name)
     if full_name not in self._descriptors:
-      self.FindFileContainingSymbol(full_name)
+      self._FindFileContainingSymbolInDb(full_name)
     return self._descriptors[full_name]
 
   def FindEnumTypeByName(self, full_name):
@@ -329,11 +408,14 @@ class DescriptorPool(object):
 
     Returns:
       The enum descriptor for the named type.
+
+    Raises:
+      KeyError: if the enum cannot be found in the pool.
     """
 
     full_name = _NormalizeFullyQualifiedName(full_name)
     if full_name not in self._enum_descriptors:
-      self.FindFileContainingSymbol(full_name)
+      self._FindFileContainingSymbolInDb(full_name)
     return self._enum_descriptors[full_name]
 
   def FindFieldByName(self, full_name):
@@ -344,12 +426,32 @@ class DescriptorPool(object):
 
     Returns:
       The field descriptor for the named field.
+
+    Raises:
+      KeyError: if the field cannot be found in the pool.
     """
     full_name = _NormalizeFullyQualifiedName(full_name)
     message_name, _, field_name = full_name.rpartition('.')
     message_descriptor = self.FindMessageTypeByName(message_name)
     return message_descriptor.fields_by_name[field_name]
 
+  def FindOneofByName(self, full_name):
+    """Loads the named oneof descriptor from the pool.
+
+    Args:
+      full_name: The full name of the oneof descriptor to load.
+
+    Returns:
+      The oneof descriptor for the named oneof.
+
+    Raises:
+      KeyError: if the oneof cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    message_name, _, oneof_name = full_name.rpartition('.')
+    message_descriptor = self.FindMessageTypeByName(message_name)
+    return message_descriptor.oneofs_by_name[oneof_name]
+
   def FindExtensionByName(self, full_name):
     """Loads the named extension descriptor from the pool.
 
@@ -358,6 +460,9 @@ class DescriptorPool(object):
 
     Returns:
       A FieldDescriptor, describing the named extension.
+
+    Raises:
+      KeyError: if the extension cannot be found in the pool.
     """
     full_name = _NormalizeFullyQualifiedName(full_name)
     try:
@@ -374,7 +479,7 @@ class DescriptorPool(object):
       scope = self.FindMessageTypeByName(message_name)
     except KeyError:
       # Some extensions are defined at file scope.
-      scope = self.FindFileContainingSymbol(full_name)
+      scope = self._FindFileContainingSymbolInDb(full_name)
     return scope.extensions_by_name[extension_name]
 
   def FindExtensionByNumber(self, message_descriptor, number):
@@ -390,7 +495,7 @@ class DescriptorPool(object):
     Returns:
       A FieldDescriptor describing the extension.
 
-    Raise:
+    Raises:
       KeyError: when no extension with the given number is known for the
         specified message.
     """
@@ -410,6 +515,46 @@ class DescriptorPool(object):
     """
     return list(self._extensions_by_number[message_descriptor].values())
 
+  def FindServiceByName(self, full_name):
+    """Loads the named service descriptor from the pool.
+
+    Args:
+      full_name: The full name of the service descriptor to load.
+
+    Returns:
+      The service descriptor for the named service.
+
+    Raises:
+      KeyError: if the service cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    if full_name not in self._service_descriptors:
+      self._FindFileContainingSymbolInDb(full_name)
+    return self._service_descriptors[full_name]
+
+  def _FindFileContainingSymbolInDb(self, symbol):
+    """Finds the file in descriptor DB containing the specified symbol.
+
+    Args:
+      symbol: The name of the symbol to search for.
+
+    Returns:
+      A FileDescriptor that contains the specified symbol.
+
+    Raises:
+      KeyError: if the file cannot be found in the descriptor database.
+    """
+    try:
+      file_proto = self._internal_db.FindFileContainingSymbol(symbol)
+    except KeyError as error:
+      if self._descriptor_db:
+        file_proto = self._descriptor_db.FindFileContainingSymbol(symbol)
+      else:
+        raise error
+    if not file_proto:
+      raise KeyError('Cannot find a file containing %s' % symbol)
+    return self._ConvertFileProtoToFileDescriptor(file_proto)
+
   def _ConvertFileProtoToFileDescriptor(self, file_proto):
     """Creates a FileDescriptor from a proto or returns a cached copy.
 
@@ -463,7 +608,8 @@ class DescriptorPool(object):
 
       for index, extension_proto in enumerate(file_proto.extension):
         extension_desc = self._MakeFieldDescriptor(
-            extension_proto, file_proto.package, index, is_extension=True)
+            extension_proto, file_proto.package, index, file_descriptor,
+            is_extension=True)
         extension_desc.containing_type = self._GetTypeFromScope(
             file_descriptor.package, extension_proto.extendee, scope)
         self._SetFieldType(extension_proto, extension_desc,
@@ -529,10 +675,10 @@ class DescriptorPool(object):
     enums = [
         self._ConvertEnumDescriptor(enum, desc_name, file_desc, None, scope)
         for enum in desc_proto.enum_type]
-    fields = [self._MakeFieldDescriptor(field, desc_name, index)
+    fields = [self._MakeFieldDescriptor(field, desc_name, index, file_desc)
               for index, field in enumerate(desc_proto.field)]
     extensions = [
-        self._MakeFieldDescriptor(extension, desc_name, index,
+        self._MakeFieldDescriptor(extension, desc_name, index, file_desc,
                                   is_extension=True)
         for index, extension in enumerate(desc_proto.extension)]
     oneofs = [
@@ -572,6 +718,7 @@ class DescriptorPool(object):
         fields[field_index].containing_oneof = oneofs[oneof_index]
 
     scope[_PrefixWithDot(desc_name)] = desc
+    self._CheckConflictRegister(desc)
     self._descriptors[desc_name] = desc
     return desc
 
@@ -610,11 +757,12 @@ class DescriptorPool(object):
                                      containing_type=containing_type,
                                      options=_OptionsOrNone(enum_proto))
     scope['.%s' % enum_name] = desc
+    self._CheckConflictRegister(desc)
     self._enum_descriptors[enum_name] = desc
     return desc
 
   def _MakeFieldDescriptor(self, field_proto, message_name, index,
-                           is_extension=False):
+                           file_desc, is_extension=False):
     """Creates a field descriptor from a FieldDescriptorProto.
 
     For message and enum type fields, this method will do a look up
@@ -627,6 +775,7 @@ class DescriptorPool(object):
       field_proto: The proto describing the field.
       message_name: The name of the containing message.
       index: Index of the field
+      file_desc: The file containing the field descriptor.
       is_extension: Indication that this field is for an extension.
 
     Returns:
@@ -653,7 +802,8 @@ class DescriptorPool(object):
         default_value=None,
         is_extension=is_extension,
         extension_scope=None,
-        options=_OptionsOrNone(field_proto))
+        options=_OptionsOrNone(field_proto),
+        file=file_desc)
 
   def _SetAllFieldTypes(self, package, desc_proto, scope):
     """Sets all the descriptor's fields's types.
@@ -804,6 +954,8 @@ class DescriptorPool(object):
                                         methods=methods,
                                         options=_OptionsOrNone(service_proto),
                                         file=file_desc)
+    self._CheckConflictRegister(desc)
+    self._service_descriptors[service_name] = desc
     return desc
 
   def _MakeMethodDescriptor(self, method_proto, service_name, package, scope,
diff --git a/python/google/protobuf/internal/_parameterized.py b/python/google/protobuf/internal/_parameterized.py
index 23a78f03..f2c0b305 100755
--- a/python/google/protobuf/internal/_parameterized.py
+++ b/python/google/protobuf/internal/_parameterized.py
@@ -37,8 +37,8 @@ argument tuples.
 
 A simple example:
 
-  class AdditionExample(parameterized.ParameterizedTestCase):
-    @parameterized.Parameters(
+  class AdditionExample(parameterized.TestCase):
+    @parameterized.parameters(
        (1, 2, 3),
        (4, 5, 9),
        (1, 1, 3))
@@ -54,8 +54,8 @@ fail due to an assertion error (1 + 1 != 3).
 Parameters for invididual test cases can be tuples (with positional parameters)
 or dictionaries (with named parameters):
 
-  class AdditionExample(parameterized.ParameterizedTestCase):
-    @parameterized.Parameters(
+  class AdditionExample(parameterized.TestCase):
+    @parameterized.parameters(
        {'op1': 1, 'op2': 2, 'result': 3},
        {'op1': 4, 'op2': 5, 'result': 9},
     )
@@ -77,13 +77,13 @@ stay the same across several invocations, object representations like
   '<__main__.Foo object at 0x23d8610>'
 
 are turned into '<__main__.Foo>'. For even more descriptive names,
-especially in test logs, you can use the NamedParameters decorator. In
+especially in test logs, you can use the named_parameters decorator. In
 this case, only tuples are supported, and the first parameters has to
 be a string (or an object that returns an apt name when converted via
 str()):
 
-  class NamedExample(parameterized.ParameterizedTestCase):
-    @parameterized.NamedParameters(
+  class NamedExample(parameterized.TestCase):
+    @parameterized.named_parameters(
        ('Normal', 'aa', 'aaa', True),
        ('EmptyPrefix', '', 'abc', True),
        ('BothEmpty', '', '', True))
@@ -103,13 +103,13 @@ from the command line:
 Parameterized Classes
 =====================
 If invocation arguments are shared across test methods in a single
-ParameterizedTestCase class, instead of decorating all test methods
+TestCase class, instead of decorating all test methods
 individually, the class itself can be decorated:
 
-  @parameterized.Parameters(
+  @parameterized.parameters(
     (1, 2, 3)
     (4, 5, 9))
-  class ArithmeticTest(parameterized.ParameterizedTestCase):
+  class ArithmeticTest(parameterized.TestCase):
     def testAdd(self, arg1, arg2, result):
       self.assertEqual(arg1 + arg2, result)
 
@@ -122,8 +122,8 @@ If parameters should be shared across several test cases, or are dynamically
 created from other sources, a single non-tuple iterable can be passed into
 the decorator. This iterable will be used to obtain the test cases:
 
-  class AdditionExample(parameterized.ParameterizedTestCase):
-    @parameterized.Parameters(
+  class AdditionExample(parameterized.TestCase):
+    @parameterized.parameters(
       c.op1, c.op2, c.result for c in testcases
     )
     def testAddition(self, op1, op2, result):
@@ -135,8 +135,8 @@ Single-Argument Test Methods
 If a test method takes only one argument, the single argument does not need to
 be wrapped into a tuple:
 
-  class NegativeNumberExample(parameterized.ParameterizedTestCase):
-    @parameterized.Parameters(
+  class NegativeNumberExample(parameterized.TestCase):
+    @parameterized.parameters(
        -1, -3, -4, -5
     )
     def testIsNegative(self, arg):
@@ -212,7 +212,7 @@ class _ParameterizedTestIter(object):
   def __call__(self, *args, **kwargs):
     raise RuntimeError('You appear to be running a parameterized test case '
                        'without having inherited from parameterized.'
-                       'ParameterizedTestCase. This is bad because none of '
+                       'TestCase. This is bad because none of '
                        'your test cases are actually being run.')
 
   def __iter__(self):
@@ -306,7 +306,7 @@ def _ParameterDecorator(naming_type, testcases):
   return _Apply
 
 
-def Parameters(*testcases):
+def parameters(*testcases):  # pylint: disable=invalid-name
   """A decorator for creating parameterized tests.
 
   See the module docstring for a usage example.
@@ -321,7 +321,7 @@ def Parameters(*testcases):
   return _ParameterDecorator(_ARGUMENT_REPR, testcases)
 
 
-def NamedParameters(*testcases):
+def named_parameters(*testcases):  # pylint: disable=invalid-name
   """A decorator for creating parameterized tests.
 
   See the module docstring for a usage example. The first element of
@@ -348,7 +348,7 @@ class TestGeneratorMetaclass(type):
   up as tests by the unittest framework.
 
   In general, it is supposed to be used in conjunction with the
-  Parameters decorator.
+  parameters decorator.
   """
 
   def __new__(mcs, class_name, bases, dct):
@@ -385,8 +385,8 @@ def _UpdateClassDictForParamTestCase(dct, id_suffix, name, iterator):
     id_suffix[new_name] = getattr(func, '__x_extra_id__', '')
 
 
-class ParameterizedTestCase(unittest.TestCase):
-  """Base class for test cases using the Parameters decorator."""
+class TestCase(unittest.TestCase):
+  """Base class for test cases using the parameters decorator."""
   __metaclass__ = TestGeneratorMetaclass
 
   def _OriginalName(self):
@@ -409,10 +409,10 @@ class ParameterizedTestCase(unittest.TestCase):
                         self._id_suffix.get(self._testMethodName, ''))
 
 
-def CoopParameterizedTestCase(other_base_class):
+def CoopTestCase(other_base_class):
   """Returns a new base class with a cooperative metaclass base.
 
-  This enables the ParameterizedTestCase to be used in combination
+  This enables the TestCase to be used in combination
   with other base classes that have custom metaclasses, such as
   mox.MoxTestBase.
 
@@ -425,7 +425,7 @@ def CoopParameterizedTestCase(other_base_class):
 
     from google3.testing.pybase import parameterized
 
-    class ExampleTest(parameterized.CoopParameterizedTestCase(mox.MoxTestBase)):
+    class ExampleTest(parameterized.CoopTestCase(mox.MoxTestBase)):
       ...
 
   Args:
@@ -439,5 +439,5 @@ def CoopParameterizedTestCase(other_base_class):
       (other_base_class.__metaclass__,
        TestGeneratorMetaclass), {})
   return metaclass(
-      'CoopParameterizedTestCase',
-      (other_base_class, ParameterizedTestCase), {})
+      'CoopTestCase',
+      (other_base_class, TestCase), {})
diff --git a/python/google/protobuf/internal/any_test.proto b/python/google/protobuf/internal/any_test.proto
index 76a7ebd6..1a563fd9 100644
--- a/python/google/protobuf/internal/any_test.proto
+++ b/python/google/protobuf/internal/any_test.proto
@@ -39,6 +39,7 @@ import "google/protobuf/any.proto";
 message TestAny {
   optional google.protobuf.Any value = 1;
   optional int32 int_value = 2;
+  map<string,int32> map_value = 3;
   extensions 10 to max;
 }
 
diff --git a/python/google/protobuf/internal/api_implementation.py b/python/google/protobuf/internal/api_implementation.py
index 460a4a6c..ab9e7812 100755
--- a/python/google/protobuf/internal/api_implementation.py
+++ b/python/google/protobuf/internal/api_implementation.py
@@ -61,10 +61,18 @@ if _api_version < 0:  # Still unspecified?
     del _use_fast_cpp_protos
     _api_version = 2
   except ImportError:
-    if _proto_extension_modules_exist_in_build:
-      if sys.version_info[0] >= 3:  # Python 3 defaults to C++ impl v2.
-        _api_version = 2
-      # TODO(b/17427486): Make Python 2 default to C++ impl v2.
+    try:
+      # pylint: disable=g-import-not-at-top
+      from google.protobuf.internal import use_pure_python
+      del use_pure_python  # Avoids a pylint error and namespace pollution.
+    except ImportError:
+      # TODO(b/74017912): It's unsafe to enable :use_fast_cpp_protos by default;
+      # it can cause data loss if you have any Python-only extensions to any
+      # message passed back and forth with C++ code.
+      #
+      # TODO(b/17427486): Once that bug is fixed, we want to make both Python 2
+      # and Python 3 default to `_api_version = 2` (C++ implementation V2).
+      pass
 
 _default_implementation_type = (
     'python' if _api_version <= 0 else 'cpp')
@@ -100,6 +108,27 @@ if _implementation_version_str != '2':
 _implementation_version = int(_implementation_version_str)
 
 
+# Detect if serialization should be deterministic by default
+try:
+  # The presence of this module in a build allows the proto implementation to
+  # be upgraded merely via build deps.
+  #
+  # NOTE: Merely importing this automatically enables deterministic proto
+  # serialization for C++ code, but we still need to export it as a boolean so
+  # that we can do the same for `_implementation_type == 'python'`.
+  #
+  # NOTE2: It is possible for C++ code to enable deterministic serialization by
+  # default _without_ affecting Python code, if the C++ implementation is not in
+  # use by this module.  That is intended behavior, so we don't actually expose
+  # this boolean outside of this module.
+  #
+  # pylint: disable=g-import-not-at-top,unused-import
+  from google.protobuf import enable_deterministic_proto_serialization
+  _python_deterministic_proto_serialization = True
+except ImportError:
+  _python_deterministic_proto_serialization = False
+
+
 # Usage of this function is discouraged. Clients shouldn't care which
 # implementation of the API is in use. Note that there is no guarantee
 # that differences between APIs will be maintained.
@@ -111,3 +140,34 @@ def Type():
 # See comment on 'Type' above.
 def Version():
   return _implementation_version
+
+
+# For internal use only
+def IsPythonDefaultSerializationDeterministic():
+  return _python_deterministic_proto_serialization
+
+# DO NOT USE: For migration and testing only. Will be removed when Proto3
+# defaults to preserve unknowns.
+if _implementation_type == 'cpp':
+  try:
+    # pylint: disable=g-import-not-at-top
+    from google.protobuf.pyext import _message
+
+    def GetPythonProto3PreserveUnknownsDefault():
+      return _message.GetPythonProto3PreserveUnknownsDefault()
+
+    def SetPythonProto3PreserveUnknownsDefault(preserve):
+      _message.SetPythonProto3PreserveUnknownsDefault(preserve)
+  except ImportError:
+    # Unrecognized cpp implementation. Skipping the unknown fields APIs.
+    pass
+else:
+  _python_proto3_preserve_unknowns_default = True
+
+  def GetPythonProto3PreserveUnknownsDefault():
+    return _python_proto3_preserve_unknowns_default
+
+  def SetPythonProto3PreserveUnknownsDefault(preserve):
+    global _python_proto3_preserve_unknowns_default
+    _python_proto3_preserve_unknowns_default = preserve
+
diff --git a/python/google/protobuf/internal/containers.py b/python/google/protobuf/internal/containers.py
index de13018e..c6a3692a 100755
--- a/python/google/protobuf/internal/containers.py
+++ b/python/google/protobuf/internal/containers.py
@@ -275,7 +275,7 @@ class RepeatedScalarFieldContainer(BaseContainer):
     new_values = [self._type_checker.CheckValue(elem) for elem in elem_seq_iter]
     if new_values:
       self._values.extend(new_values)
-      self._message_listener.Modified()
+    self._message_listener.Modified()
 
   def MergeFrom(self, other):
     """Appends the contents of another repeated field of the same type to this
@@ -549,10 +549,10 @@ class MessageMap(MutableMapping):
     self._values = {}
 
   def __getitem__(self, key):
+    key = self._key_checker.CheckValue(key)
     try:
       return self._values[key]
     except KeyError:
-      key = self._key_checker.CheckValue(key)
       new_element = self._message_descriptor._concrete_class()
       new_element._SetListener(self._message_listener)
       self._values[key] = new_element
@@ -584,12 +584,14 @@ class MessageMap(MutableMapping):
       return default
 
   def __contains__(self, item):
+    item = self._key_checker.CheckValue(item)
     return item in self._values
 
   def __setitem__(self, key, value):
     raise ValueError('May not set values directly, call my_map[key].foo = 5')
 
   def __delitem__(self, key):
+    key = self._key_checker.CheckValue(key)
     del self._values[key]
     self._message_listener.Modified()
 
diff --git a/python/google/protobuf/internal/decoder.py b/python/google/protobuf/internal/decoder.py
index ff3e6d30..52b64915 100755
--- a/python/google/protobuf/internal/decoder.py
+++ b/python/google/protobuf/internal/decoder.py
@@ -181,7 +181,7 @@ def ReadTag(buffer, pos):
   while six.indexbytes(buffer, pos) & 0x80:
     pos += 1
   pos += 1
-  return (buffer[start:pos], pos)
+  return (six.binary_type(buffer[start:pos]), pos)
 
 
 # --------------------------------------------------------------------
diff --git a/python/google/protobuf/internal/descriptor_database_test.py b/python/google/protobuf/internal/descriptor_database_test.py
index 5225a458..f97477b3 100644
--- a/python/google/protobuf/internal/descriptor_database_test.py
+++ b/python/google/protobuf/internal/descriptor_database_test.py
@@ -38,7 +38,9 @@ try:
   import unittest2 as unittest  #PY26
 except ImportError:
   import unittest
+import warnings
 
+from google.protobuf import unittest_pb2
 from google.protobuf import descriptor_pb2
 from google.protobuf.internal import factory_test2_pb2
 from google.protobuf import descriptor_database
@@ -54,16 +56,69 @@ class DescriptorDatabaseTest(unittest.TestCase):
 
     self.assertEqual(file_desc_proto, db.FindFileByName(
         'google/protobuf/internal/factory_test2.proto'))
+    # Can find message type.
     self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
         'google.protobuf.python.internal.Factory2Message'))
+    # Can find nested message type.
     self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
         'google.protobuf.python.internal.Factory2Message.NestedFactory2Message'))
+    # Can find enum type.
     self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
         'google.protobuf.python.internal.Factory2Enum'))
+    # Can find nested enum type.
     self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
         'google.protobuf.python.internal.Factory2Message.NestedFactory2Enum'))
     self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
         'google.protobuf.python.internal.MessageWithNestedEnumOnly.NestedEnum'))
+    # Can find field.
+    self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
+        'google.protobuf.python.internal.Factory2Message.list_field'))
+    # Can find enum value.
+    self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
+        'google.protobuf.python.internal.Factory2Enum.FACTORY_2_VALUE_0'))
+    # Can find top level extension.
+    self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
+        'google.protobuf.python.internal.another_field'))
+    # Can find nested extension inside a message.
+    self.assertEqual(file_desc_proto, db.FindFileContainingSymbol(
+        'google.protobuf.python.internal.Factory2Message.one_more_field'))
+
+    # Can find service.
+    file_desc_proto2 = descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb)
+    db.Add(file_desc_proto2)
+    self.assertEqual(file_desc_proto2, db.FindFileContainingSymbol(
+        'protobuf_unittest.TestService'))
+
+    # Non-existent field under a valid top level symbol can also be
+    # found. The behavior is the same with protobuf C++.
+    self.assertEqual(file_desc_proto2, db.FindFileContainingSymbol(
+        'protobuf_unittest.TestAllTypes.none_field'))
+
+    self.assertRaises(KeyError,
+                      db.FindFileContainingSymbol,
+                      'protobuf_unittest.NoneMessage')
+
+  def testConflictRegister(self):
+    db = descriptor_database.DescriptorDatabase()
+    unittest_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb)
+    db.Add(unittest_fd)
+    conflict_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb)
+    conflict_fd.name = 'other_file'
+    with warnings.catch_warnings(record=True) as w:
+      # Cause all warnings to always be triggered.
+      warnings.simplefilter('always')
+      db.Add(conflict_fd)
+      self.assertTrue(len(w))
+      self.assertIs(w[0].category, RuntimeWarning)
+      self.assertIn('Conflict register for file "other_file": ',
+                    str(w[0].message))
+      self.assertIn('already defined in file '
+                    '"google/protobuf/unittest.proto"',
+                    str(w[0].message))
+
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/python/google/protobuf/internal/descriptor_pool_test.py b/python/google/protobuf/internal/descriptor_pool_test.py
index 1e710dcf..2cbf7813 100644
--- a/python/google/protobuf/internal/descriptor_pool_test.py
+++ b/python/google/protobuf/internal/descriptor_pool_test.py
@@ -34,8 +34,10 @@
 
 __author__ = 'matthewtoia@google.com (Matt Toia)'
 
+import copy
 import os
 import sys
+import warnings
 
 try:
   import unittest2 as unittest  #PY26
@@ -60,16 +62,8 @@ from google.protobuf import message_factory
 from google.protobuf import symbol_database
 
 
-class DescriptorPoolTest(unittest.TestCase):
 
-  def setUp(self):
-    self.pool = descriptor_pool.DescriptorPool()
-    self.factory_test1_fd = descriptor_pb2.FileDescriptorProto.FromString(
-        factory_test1_pb2.DESCRIPTOR.serialized_pb)
-    self.factory_test2_fd = descriptor_pb2.FileDescriptorProto.FromString(
-        factory_test2_pb2.DESCRIPTOR.serialized_pb)
-    self.pool.Add(self.factory_test1_fd)
-    self.pool.Add(self.factory_test2_fd)
+class DescriptorPoolTestBase(object):
 
   def testFindFileByName(self):
     name1 = 'google/protobuf/internal/factory_test1.proto'
@@ -107,6 +101,34 @@ class DescriptorPoolTest(unittest.TestCase):
     self.assertEqual('google.protobuf.python.internal', file_desc2.package)
     self.assertIn('Factory2Message', file_desc2.message_types_by_name)
 
+    # Tests top level extension.
+    file_desc3 = self.pool.FindFileContainingSymbol(
+        'google.protobuf.python.internal.another_field')
+    self.assertIsInstance(file_desc3, descriptor.FileDescriptor)
+    self.assertEqual('google/protobuf/internal/factory_test2.proto',
+                     file_desc3.name)
+
+    # Tests nested extension inside a message.
+    file_desc4 = self.pool.FindFileContainingSymbol(
+        'google.protobuf.python.internal.Factory2Message.one_more_field')
+    self.assertIsInstance(file_desc4, descriptor.FileDescriptor)
+    self.assertEqual('google/protobuf/internal/factory_test2.proto',
+                     file_desc4.name)
+
+    file_desc5 = self.pool.FindFileContainingSymbol(
+        'protobuf_unittest.TestService')
+    self.assertIsInstance(file_desc5, descriptor.FileDescriptor)
+    self.assertEqual('google/protobuf/unittest.proto',
+                     file_desc5.name)
+
+    # Tests the generated pool.
+    assert descriptor_pool.Default().FindFileContainingSymbol(
+        'google.protobuf.python.internal.Factory2Message.one_more_field')
+    assert descriptor_pool.Default().FindFileContainingSymbol(
+        'google.protobuf.python.internal.another_field')
+    assert descriptor_pool.Default().FindFileContainingSymbol(
+        'protobuf_unittest.TestService')
+
   def testFindFileContainingSymbolFailure(self):
     with self.assertRaises(KeyError):
       self.pool.FindFileContainingSymbol('Does not exist')
@@ -193,6 +215,27 @@ class DescriptorPoolTest(unittest.TestCase):
                        msg2.fields_by_name[name].containing_oneof)
       self.assertIn(msg2.fields_by_name[name], msg2.oneofs[0].fields)
 
+  def testFindTypeErrors(self):
+    self.assertRaises(TypeError, self.pool.FindExtensionByNumber, '')
+
+    # TODO(jieluo): Fix python to raise correct errors.
+    if api_implementation.Type() == 'cpp':
+      self.assertRaises(TypeError, self.pool.FindMethodByName, 0)
+      self.assertRaises(KeyError, self.pool.FindMethodByName, '')
+      error_type = TypeError
+    else:
+      error_type = AttributeError
+    self.assertRaises(error_type, self.pool.FindMessageTypeByName, 0)
+    self.assertRaises(error_type, self.pool.FindFieldByName, 0)
+    self.assertRaises(error_type, self.pool.FindExtensionByName, 0)
+    self.assertRaises(error_type, self.pool.FindEnumTypeByName, 0)
+    self.assertRaises(error_type, self.pool.FindOneofByName, 0)
+    self.assertRaises(error_type, self.pool.FindServiceByName, 0)
+    self.assertRaises(error_type, self.pool.FindFileContainingSymbol, 0)
+    if api_implementation.Type() == 'python':
+      error_type = KeyError
+    self.assertRaises(error_type, self.pool.FindFileByName, 0)
+
   def testFindMessageTypeByNameFailure(self):
     with self.assertRaises(KeyError):
       self.pool.FindMessageTypeByName('Does not exist')
@@ -232,6 +275,11 @@ class DescriptorPoolTest(unittest.TestCase):
       self.pool.FindEnumTypeByName('Does not exist')
 
   def testFindFieldByName(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # TODO(jieluo): Fix cpp extension to find field correctly
+        # when descriptor pool is using an underlying database.
+        return
     field = self.pool.FindFieldByName(
         'google.protobuf.python.internal.Factory1Message.list_value')
     self.assertEqual(field.name, 'list_value')
@@ -241,7 +289,24 @@ class DescriptorPoolTest(unittest.TestCase):
     with self.assertRaises(KeyError):
       self.pool.FindFieldByName('Does not exist')
 
+  def testFindOneofByName(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # TODO(jieluo): Fix cpp extension to find oneof correctly
+        # when descriptor pool is using an underlying database.
+        return
+    oneof = self.pool.FindOneofByName(
+        'google.protobuf.python.internal.Factory2Message.oneof_field')
+    self.assertEqual(oneof.name, 'oneof_field')
+    with self.assertRaises(KeyError):
+      self.pool.FindOneofByName('Does not exist')
+
   def testFindExtensionByName(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # TODO(jieluo): Fix cpp extension to find extension correctly
+        # when descriptor pool is using an underlying database.
+        return
     # An extension defined in a message.
     extension = self.pool.FindExtensionByName(
         'google.protobuf.python.internal.Factory2Message.one_more_field')
@@ -311,6 +376,12 @@ class DescriptorPoolTest(unittest.TestCase):
       self.pool.FindExtensionByName(
           'google.protobuf.python.internal.Factory1Message.list_value')
 
+  def testFindService(self):
+    service = self.pool.FindServiceByName('protobuf_unittest.TestService')
+    self.assertEqual(service.full_name, 'protobuf_unittest.TestService')
+    with self.assertRaises(KeyError):
+      self.pool.FindServiceByName('Does not exist')
+
   def testUserDefinedDB(self):
     db = descriptor_database.DescriptorDatabase()
     self.pool = descriptor_pool.DescriptorPool(db)
@@ -319,24 +390,17 @@ class DescriptorPoolTest(unittest.TestCase):
     self.testFindMessageTypeByName()
 
   def testAddSerializedFile(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # Cpp extension cannot call Add on a DescriptorPool
+        # that uses a DescriptorDatabase.
+        # TODO(jieluo): Fix python and cpp extension diff.
+        return
     self.pool = descriptor_pool.DescriptorPool()
     self.pool.AddSerializedFile(self.factory_test1_fd.SerializeToString())
     self.pool.AddSerializedFile(self.factory_test2_fd.SerializeToString())
     self.testFindMessageTypeByName()
 
-  def testComplexNesting(self):
-    more_messages_desc = descriptor_pb2.FileDescriptorProto.FromString(
-        more_messages_pb2.DESCRIPTOR.serialized_pb)
-    test1_desc = descriptor_pb2.FileDescriptorProto.FromString(
-        descriptor_pool_test1_pb2.DESCRIPTOR.serialized_pb)
-    test2_desc = descriptor_pb2.FileDescriptorProto.FromString(
-        descriptor_pool_test2_pb2.DESCRIPTOR.serialized_pb)
-    self.pool.Add(more_messages_desc)
-    self.pool.Add(test1_desc)
-    self.pool.Add(test2_desc)
-    TEST1_FILE.CheckFile(self, self.pool)
-    TEST2_FILE.CheckFile(self, self.pool)
-
 
   def testEnumDefaultValue(self):
     """Test the default value of enums which don't start at zero."""
@@ -355,6 +419,12 @@ class DescriptorPoolTest(unittest.TestCase):
     self.assertIs(file_descriptor, descriptor_pool_test1_pb2.DESCRIPTOR)
     _CheckDefaultValue(file_descriptor)
 
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # Cpp extension cannot call Add on a DescriptorPool
+        # that uses a DescriptorDatabase.
+        # TODO(jieluo): Fix python and cpp extension diff.
+        return
     # Then check the dynamic pool and its internal DescriptorDatabase.
     descriptor_proto = descriptor_pb2.FileDescriptorProto.FromString(
         descriptor_pool_test1_pb2.DESCRIPTOR.serialized_pb)
@@ -402,6 +472,156 @@ class DescriptorPoolTest(unittest.TestCase):
             unittest_pb2.TestAllTypes.DESCRIPTOR.full_name))
     _CheckDefaultValues(message_class())
 
+  def testAddFileDescriptor(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # Cpp extension cannot call Add on a DescriptorPool
+        # that uses a DescriptorDatabase.
+        # TODO(jieluo): Fix python and cpp extension diff.
+        return
+    file_desc = descriptor_pb2.FileDescriptorProto(name='some/file.proto')
+    self.pool.Add(file_desc)
+    self.pool.AddSerializedFile(file_desc.SerializeToString())
+
+  def testComplexNesting(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # Cpp extension cannot call Add on a DescriptorPool
+        # that uses a DescriptorDatabase.
+        # TODO(jieluo): Fix python and cpp extension diff.
+        return
+    more_messages_desc = descriptor_pb2.FileDescriptorProto.FromString(
+        more_messages_pb2.DESCRIPTOR.serialized_pb)
+    test1_desc = descriptor_pb2.FileDescriptorProto.FromString(
+        descriptor_pool_test1_pb2.DESCRIPTOR.serialized_pb)
+    test2_desc = descriptor_pb2.FileDescriptorProto.FromString(
+        descriptor_pool_test2_pb2.DESCRIPTOR.serialized_pb)
+    self.pool.Add(more_messages_desc)
+    self.pool.Add(test1_desc)
+    self.pool.Add(test2_desc)
+    TEST1_FILE.CheckFile(self, self.pool)
+    TEST2_FILE.CheckFile(self, self.pool)
+
+  def testConflictRegister(self):
+    if isinstance(self, SecondaryDescriptorFromDescriptorDB):
+      if api_implementation.Type() == 'cpp':
+        # Cpp extension cannot call Add on a DescriptorPool
+        # that uses a DescriptorDatabase.
+        # TODO(jieluo): Fix python and cpp extension diff.
+        return
+    unittest_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb)
+    conflict_fd = copy.deepcopy(unittest_fd)
+    conflict_fd.name = 'other_file'
+    if api_implementation.Type() == 'cpp':
+      try:
+        self.pool.Add(unittest_fd)
+        self.pool.Add(conflict_fd)
+      except TypeError:
+        pass
+    else:
+      with warnings.catch_warnings(record=True) as w:
+        # Cause all warnings to always be triggered.
+        warnings.simplefilter('always')
+        pool = copy.deepcopy(self.pool)
+        # No warnings to add the same descriptors.
+        file_descriptor = unittest_pb2.DESCRIPTOR
+        pool.AddDescriptor(
+            file_descriptor.message_types_by_name['TestAllTypes'])
+        pool.AddEnumDescriptor(
+            file_descriptor.enum_types_by_name['ForeignEnum'])
+        pool.AddServiceDescriptor(
+            file_descriptor.services_by_name['TestService'])
+        pool.AddExtensionDescriptor(
+            file_descriptor.extensions_by_name['optional_int32_extension'])
+        self.assertEqual(len(w), 0)
+        # Check warnings for conflict descriptors with the same name.
+        pool.Add(unittest_fd)
+        pool.Add(conflict_fd)
+        pool.FindFileByName(unittest_fd.name)
+        pool.FindFileByName(conflict_fd.name)
+        self.assertTrue(len(w))
+        self.assertIs(w[0].category, RuntimeWarning)
+        self.assertIn('Conflict register for file "other_file": ',
+                      str(w[0].message))
+        self.assertIn('already defined in file '
+                      '"google/protobuf/unittest.proto"',
+                      str(w[0].message))
+
+
+class DefaultDescriptorPoolTest(DescriptorPoolTestBase, unittest.TestCase):
+
+  def setUp(self):
+    self.pool = descriptor_pool.Default()
+    self.factory_test1_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test1_pb2.DESCRIPTOR.serialized_pb)
+    self.factory_test2_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test2_pb2.DESCRIPTOR.serialized_pb)
+
+  def testFindMethods(self):
+    self.assertIs(
+        self.pool.FindFileByName('google/protobuf/unittest.proto'),
+        unittest_pb2.DESCRIPTOR)
+    self.assertIs(
+        self.pool.FindMessageTypeByName('protobuf_unittest.TestAllTypes'),
+        unittest_pb2.TestAllTypes.DESCRIPTOR)
+    self.assertIs(
+        self.pool.FindFieldByName(
+            'protobuf_unittest.TestAllTypes.optional_int32'),
+        unittest_pb2.TestAllTypes.DESCRIPTOR.fields_by_name['optional_int32'])
+    self.assertIs(
+        self.pool.FindEnumTypeByName('protobuf_unittest.ForeignEnum'),
+        unittest_pb2.ForeignEnum.DESCRIPTOR)
+    self.assertIs(
+        self.pool.FindExtensionByName(
+            'protobuf_unittest.optional_int32_extension'),
+        unittest_pb2.DESCRIPTOR.extensions_by_name['optional_int32_extension'])
+    self.assertIs(
+        self.pool.FindOneofByName('protobuf_unittest.TestAllTypes.oneof_field'),
+        unittest_pb2.TestAllTypes.DESCRIPTOR.oneofs_by_name['oneof_field'])
+    self.assertIs(
+        self.pool.FindServiceByName('protobuf_unittest.TestService'),
+        unittest_pb2.DESCRIPTOR.services_by_name['TestService'])
+
+
+class CreateDescriptorPoolTest(DescriptorPoolTestBase, unittest.TestCase):
+
+  def setUp(self):
+    self.pool = descriptor_pool.DescriptorPool()
+    self.factory_test1_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test1_pb2.DESCRIPTOR.serialized_pb)
+    self.factory_test2_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test2_pb2.DESCRIPTOR.serialized_pb)
+    self.pool.Add(self.factory_test1_fd)
+    self.pool.Add(self.factory_test2_fd)
+
+    self.pool.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_import_public_pb2.DESCRIPTOR.serialized_pb))
+    self.pool.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_import_pb2.DESCRIPTOR.serialized_pb))
+    self.pool.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb))
+
+
+class SecondaryDescriptorFromDescriptorDB(DescriptorPoolTestBase,
+                                          unittest.TestCase):
+
+  def setUp(self):
+    self.factory_test1_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test1_pb2.DESCRIPTOR.serialized_pb)
+    self.factory_test2_fd = descriptor_pb2.FileDescriptorProto.FromString(
+        factory_test2_pb2.DESCRIPTOR.serialized_pb)
+    db = descriptor_database.DescriptorDatabase()
+    db.Add(self.factory_test1_fd)
+    db.Add(self.factory_test2_fd)
+    db.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_import_public_pb2.DESCRIPTOR.serialized_pb))
+    db.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_import_pb2.DESCRIPTOR.serialized_pb))
+    db.Add(descriptor_pb2.FileDescriptorProto.FromString(
+        unittest_pb2.DESCRIPTOR.serialized_pb))
+    self.pool = descriptor_pool.DescriptorPool(descriptor_db=db)
+
 
 class ProtoFile(object):
 
@@ -472,10 +692,10 @@ class MessageType(object):
       subtype.CheckType(test, desc, name, file_desc)
 
     for index, (name, field) in enumerate(self.field_list):
-      field.CheckField(test, desc, name, index)
+      field.CheckField(test, desc, name, index, file_desc)
 
     for index, (name, field) in enumerate(self.extensions):
-      field.CheckField(test, desc, name, index)
+      field.CheckField(test, desc, name, index, file_desc)
 
 
 class EnumField(object):
@@ -485,7 +705,7 @@ class EnumField(object):
     self.type_name = type_name
     self.default_value = default_value
 
-  def CheckField(self, test, msg_desc, name, index):
+  def CheckField(self, test, msg_desc, name, index, file_desc):
     field_desc = msg_desc.fields_by_name[name]
     enum_desc = msg_desc.enum_types_by_name[self.type_name]
     test.assertEqual(name, field_desc.name)
@@ -502,6 +722,7 @@ class EnumField(object):
     test.assertFalse(enum_desc.values_by_name[self.default_value].has_options)
     test.assertEqual(msg_desc, field_desc.containing_type)
     test.assertEqual(enum_desc, field_desc.enum_type)
+    test.assertEqual(file_desc, enum_desc.file)
 
 
 class MessageField(object):
@@ -510,7 +731,7 @@ class MessageField(object):
     self.number = number
     self.type_name = type_name
 
-  def CheckField(self, test, msg_desc, name, index):
+  def CheckField(self, test, msg_desc, name, index, file_desc):
     field_desc = msg_desc.fields_by_name[name]
     field_type_desc = msg_desc.nested_types_by_name[self.type_name]
     test.assertEqual(name, field_desc.name)
@@ -524,6 +745,12 @@ class MessageField(object):
     test.assertFalse(field_desc.has_default_value)
     test.assertEqual(msg_desc, field_desc.containing_type)
     test.assertEqual(field_type_desc, field_desc.message_type)
+    test.assertEqual(file_desc, field_desc.file)
+    # TODO(jieluo): Fix python and cpp extension diff for message field
+    # default value.
+    if api_implementation.Type() == 'cpp':
+      test.assertRaises(
+          NotImplementedError, getattr, field_desc, 'default_value')
 
 
 class StringField(object):
@@ -532,7 +759,7 @@ class StringField(object):
     self.number = number
     self.default_value = default_value
 
-  def CheckField(self, test, msg_desc, name, index):
+  def CheckField(self, test, msg_desc, name, index, file_desc):
     field_desc = msg_desc.fields_by_name[name]
     test.assertEqual(name, field_desc.name)
     expected_field_full_name = '.'.join([msg_desc.full_name, name])
@@ -544,6 +771,7 @@ class StringField(object):
                      field_desc.cpp_type)
     test.assertTrue(field_desc.has_default_value)
     test.assertEqual(self.default_value, field_desc.default_value)
+    test.assertEqual(file_desc, field_desc.file)
 
 
 class ExtensionField(object):
@@ -552,7 +780,7 @@ class ExtensionField(object):
     self.number = number
     self.extended_type = extended_type
 
-  def CheckField(self, test, msg_desc, name, index):
+  def CheckField(self, test, msg_desc, name, index, file_desc):
     field_desc = msg_desc.extensions_by_name[name]
     test.assertEqual(name, field_desc.name)
     expected_field_full_name = '.'.join([msg_desc.full_name, name])
@@ -567,6 +795,7 @@ class ExtensionField(object):
     test.assertEqual(msg_desc, field_desc.extension_scope)
     test.assertEqual(msg_desc, field_desc.message_type)
     test.assertEqual(self.extended_type, field_desc.containing_type.name)
+    test.assertEqual(file_desc, field_desc.file)
 
 
 class AddDescriptorTest(unittest.TestCase):
@@ -645,6 +874,17 @@ class AddDescriptorTest(unittest.TestCase):
 
   @unittest.skipIf(api_implementation.Type() == 'cpp',
                    'With the cpp implementation, Add() must be called first')
+  def testService(self):
+    pool = descriptor_pool.DescriptorPool()
+    with self.assertRaises(KeyError):
+      pool.FindServiceByName('protobuf_unittest.TestService')
+    pool.AddServiceDescriptor(unittest_pb2._TESTSERVICE)
+    self.assertEqual(
+        'protobuf_unittest.TestService',
+        pool.FindServiceByName('protobuf_unittest.TestService').full_name)
+
+  @unittest.skipIf(api_implementation.Type() == 'cpp',
+                   'With the cpp implementation, Add() must be called first')
   def testFile(self):
     pool = descriptor_pool.DescriptorPool()
     pool.AddFileDescriptor(unittest_pb2.DESCRIPTOR)
@@ -682,6 +922,25 @@ class AddDescriptorTest(unittest.TestCase):
                      'some/file.proto')
     self.assertEqual(pool.FindMessageTypeByName('package.Message').name,
                      'Message')
+    # Test no package
+    file_proto = descriptor_pb2.FileDescriptorProto(
+        name='some/filename/container.proto')
+    message_proto = file_proto.message_type.add(
+        name='TopMessage')
+    message_proto.field.add(
+        name='bb',
+        number=1,
+        type=descriptor_pb2.FieldDescriptorProto.TYPE_INT32,
+        label=descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL)
+    enum_proto = file_proto.enum_type.add(name='TopEnum')
+    enum_proto.value.add(name='FOREIGN_FOO', number=4)
+    file_proto.service.add(name='TopService')
+    pool = descriptor_pool.DescriptorPool()
+    pool.Add(file_proto)
+    self.assertEqual('TopMessage',
+                     pool.FindMessageTypeByName('TopMessage').name)
+    self.assertEqual('TopEnum', pool.FindEnumTypeByName('TopEnum').name)
+    self.assertEqual('TopService', pool.FindServiceByName('TopService').name)
 
   def testFileDescriptorOptionsWithCustomDescriptorPool(self):
     # Create a descriptor pool, and add a new FileDescriptorProto to it.
@@ -700,42 +959,18 @@ class AddDescriptorTest(unittest.TestCase):
     # The object returned by GetOptions() is cached.
     self.assertIs(options, file_descriptor.GetOptions())
 
-
-@unittest.skipIf(
-    api_implementation.Type() != 'cpp',
-    'default_pool is only supported by the C++ implementation')
-class DefaultPoolTest(unittest.TestCase):
-
-  def testFindMethods(self):
-    # pylint: disable=g-import-not-at-top
-    from google.protobuf.pyext import _message
-    pool = _message.default_pool
-    self.assertIs(
-        pool.FindFileByName('google/protobuf/unittest.proto'),
-        unittest_pb2.DESCRIPTOR)
-    self.assertIs(
-        pool.FindMessageTypeByName('protobuf_unittest.TestAllTypes'),
-        unittest_pb2.TestAllTypes.DESCRIPTOR)
-    self.assertIs(
-        pool.FindFieldByName('protobuf_unittest.TestAllTypes.optional_int32'),
-        unittest_pb2.TestAllTypes.DESCRIPTOR.fields_by_name['optional_int32'])
-    self.assertIs(
-        pool.FindExtensionByName('protobuf_unittest.optional_int32_extension'),
-        unittest_pb2.DESCRIPTOR.extensions_by_name['optional_int32_extension'])
-    self.assertIs(
-        pool.FindEnumTypeByName('protobuf_unittest.ForeignEnum'),
-        unittest_pb2.ForeignEnum.DESCRIPTOR)
-    self.assertIs(
-        pool.FindOneofByName('protobuf_unittest.TestAllTypes.oneof_field'),
-        unittest_pb2.TestAllTypes.DESCRIPTOR.oneofs_by_name['oneof_field'])
-
-  def testAddFileDescriptor(self):
-    # pylint: disable=g-import-not-at-top
-    from google.protobuf.pyext import _message
-    pool = _message.default_pool
-    file_desc = descriptor_pb2.FileDescriptorProto(name='some/file.proto')
-    pool.Add(file_desc)
-    pool.AddSerializedFile(file_desc.SerializeToString())
+  def testAddTypeError(self):
+    pool = descriptor_pool.DescriptorPool()
+    with self.assertRaises(TypeError):
+      pool.AddDescriptor(0)
+    with self.assertRaises(TypeError):
+      pool.AddEnumDescriptor(0)
+    with self.assertRaises(TypeError):
+      pool.AddServiceDescriptor(0)
+    with self.assertRaises(TypeError):
+      pool.AddExtensionDescriptor(0)
+    with self.assertRaises(TypeError):
+      pool.AddFileDescriptor(0)
 
 
 TEST1_FILE = ProtoFile(
diff --git a/python/google/protobuf/internal/descriptor_test.py b/python/google/protobuf/internal/descriptor_test.py
index 1f148ab9..02a43d15 100755
--- a/python/google/protobuf/internal/descriptor_test.py
+++ b/python/google/protobuf/internal/descriptor_test.py
@@ -107,6 +107,12 @@ class DescriptorTest(unittest.TestCase):
         self.my_message.enum_types_by_name[
             'ForeignEnum'].values_by_number[4].name,
         self.my_message.EnumValueName('ForeignEnum', 4))
+    with self.assertRaises(KeyError):
+      self.my_message.EnumValueName('ForeignEnum', 999)
+    with self.assertRaises(KeyError):
+      self.my_message.EnumValueName('NoneEnum', 999)
+    with self.assertRaises(TypeError):
+      self.my_message.EnumValueName()
 
   def testEnumFixups(self):
     self.assertEqual(self.my_enum, self.my_enum.values[0].type)
@@ -134,15 +140,17 @@ class DescriptorTest(unittest.TestCase):
 
   def testSimpleCustomOptions(self):
     file_descriptor = unittest_custom_options_pb2.DESCRIPTOR
-    message_descriptor =\
-        unittest_custom_options_pb2.TestMessageWithCustomOptions.DESCRIPTOR
+    message_descriptor = (unittest_custom_options_pb2.
+                          TestMessageWithCustomOptions.DESCRIPTOR)
     field_descriptor = message_descriptor.fields_by_name['field1']
     oneof_descriptor = message_descriptor.oneofs_by_name['AnOneof']
     enum_descriptor = message_descriptor.enum_types_by_name['AnEnum']
-    enum_value_descriptor =\
-        message_descriptor.enum_values_by_name['ANENUM_VAL2']
-    service_descriptor =\
-        unittest_custom_options_pb2.TestServiceWithCustomOptions.DESCRIPTOR
+    enum_value_descriptor = (message_descriptor.
+                             enum_values_by_name['ANENUM_VAL2'])
+    other_enum_value_descriptor = (message_descriptor.
+                                   enum_values_by_name['ANENUM_VAL1'])
+    service_descriptor = (unittest_custom_options_pb2.
+                          TestServiceWithCustomOptions.DESCRIPTOR)
     method_descriptor = service_descriptor.FindMethodByName('Foo')
 
     file_options = file_descriptor.GetOptions()
@@ -178,6 +186,11 @@ class DescriptorTest(unittest.TestCase):
         unittest_custom_options_pb2.DummyMessageContainingEnum.DESCRIPTOR)
     self.assertTrue(file_descriptor.has_options)
     self.assertFalse(message_descriptor.has_options)
+    self.assertTrue(field_descriptor.has_options)
+    self.assertTrue(oneof_descriptor.has_options)
+    self.assertTrue(enum_descriptor.has_options)
+    self.assertTrue(enum_value_descriptor.has_options)
+    self.assertFalse(other_enum_value_descriptor.has_options)
 
   def testDifferentCustomOptionTypes(self):
     kint32min = -2**31
@@ -400,6 +413,12 @@ class DescriptorTest(unittest.TestCase):
     self.assertEqual(self.my_file.name, 'some/filename/some.proto')
     self.assertEqual(self.my_file.package, 'protobuf_unittest')
     self.assertEqual(self.my_file.pool, self.pool)
+    self.assertFalse(self.my_file.has_options)
+    self.assertEqual('proto2', self.my_file.syntax)
+    file_proto = descriptor_pb2.FileDescriptorProto()
+    self.my_file.CopyToProto(file_proto)
+    self.assertEqual(self.my_file.serialized_pb,
+                     file_proto.SerializeToString())
     # Generated modules also belong to the default pool.
     self.assertEqual(unittest_pb2.DESCRIPTOR.pool, descriptor_pool.Default())
 
@@ -407,13 +426,31 @@ class DescriptorTest(unittest.TestCase):
       api_implementation.Type() != 'cpp' or api_implementation.Version() != 2,
       'Immutability of descriptors is only enforced in v2 implementation')
   def testImmutableCppDescriptor(self):
+    file_descriptor = unittest_pb2.DESCRIPTOR
     message_descriptor = unittest_pb2.TestAllTypes.DESCRIPTOR
+    field_descriptor = message_descriptor.fields_by_name['optional_int32']
+    enum_descriptor = message_descriptor.enum_types_by_name['NestedEnum']
+    oneof_descriptor = message_descriptor.oneofs_by_name['oneof_field']
     with self.assertRaises(AttributeError):
       message_descriptor.fields_by_name = None
     with self.assertRaises(TypeError):
       message_descriptor.fields_by_name['Another'] = None
     with self.assertRaises(TypeError):
       message_descriptor.fields.append(None)
+    with self.assertRaises(AttributeError):
+      field_descriptor.containing_type = message_descriptor
+    with self.assertRaises(AttributeError):
+      file_descriptor.has_options = False
+    with self.assertRaises(AttributeError):
+      field_descriptor.has_options = False
+    with self.assertRaises(AttributeError):
+      oneof_descriptor.has_options = False
+    with self.assertRaises(AttributeError):
+      enum_descriptor.has_options = False
+    with self.assertRaises(AttributeError) as e:
+      message_descriptor.has_options = True
+    self.assertEqual('attribute is not writable: has_options',
+                     str(e.exception))
 
 
 class NewDescriptorTest(DescriptorTest):
@@ -442,6 +479,12 @@ class GeneratedDescriptorTest(unittest.TestCase):
     self.CheckDescriptorMapping(message_descriptor.fields_by_name)
     self.CheckDescriptorMapping(message_descriptor.fields_by_number)
     self.CheckDescriptorMapping(message_descriptor.fields_by_camelcase_name)
+    self.CheckDescriptorMapping(message_descriptor.enum_types_by_name)
+    self.CheckDescriptorMapping(message_descriptor.enum_values_by_name)
+    self.CheckDescriptorMapping(message_descriptor.oneofs_by_name)
+    self.CheckDescriptorMapping(message_descriptor.enum_types[0].values_by_name)
+    # Test extension range
+    self.assertEqual(message_descriptor.extension_ranges, [])
 
   def CheckFieldDescriptor(self, field_descriptor):
     # Basic properties
@@ -450,6 +493,7 @@ class GeneratedDescriptorTest(unittest.TestCase):
     self.assertEqual(field_descriptor.full_name,
                      'protobuf_unittest.TestAllTypes.optional_int32')
     self.assertEqual(field_descriptor.containing_type.name, 'TestAllTypes')
+    self.assertEqual(field_descriptor.file, unittest_pb2.DESCRIPTOR)
     # Test equality and hashability
     self.assertEqual(field_descriptor, field_descriptor)
     self.assertEqual(
@@ -461,32 +505,73 @@ class GeneratedDescriptorTest(unittest.TestCase):
         field_descriptor)
     self.assertIn(field_descriptor, [field_descriptor])
     self.assertIn(field_descriptor, {field_descriptor: None})
+    self.assertEqual(None, field_descriptor.extension_scope)
+    self.assertEqual(None, field_descriptor.enum_type)
+    if api_implementation.Type() == 'cpp':
+      # For test coverage only
+      self.assertEqual(field_descriptor.id, field_descriptor.id)
 
   def CheckDescriptorSequence(self, sequence):
     # Verifies that a property like 'messageDescriptor.fields' has all the
     # properties of an immutable abc.Sequence.
+    self.assertNotEqual(sequence,
+                        unittest_pb2.TestAllExtensions.DESCRIPTOR.fields)
+    self.assertNotEqual(sequence, [])
+    self.assertNotEqual(sequence, 1)
+    self.assertFalse(sequence == 1)  # Only for cpp test coverage
+    self.assertEqual(sequence, sequence)
+    expected_list = list(sequence)
+    self.assertEqual(expected_list, sequence)
     self.assertGreater(len(sequence), 0)  # Sized
-    self.assertEqual(len(sequence), len(list(sequence)))  # Iterable
+    self.assertEqual(len(sequence), len(expected_list))  # Iterable
+    self.assertEqual(sequence[len(sequence) -1], sequence[-1])
     item = sequence[0]
     self.assertEqual(item, sequence[0])
     self.assertIn(item, sequence)  # Container
     self.assertEqual(sequence.index(item), 0)
     self.assertEqual(sequence.count(item), 1)
+    other_item = unittest_pb2.NestedTestAllTypes.DESCRIPTOR.fields[0]
+    self.assertNotIn(other_item, sequence)
+    self.assertEqual(sequence.count(other_item), 0)
+    self.assertRaises(ValueError, sequence.index, other_item)
+    self.assertRaises(ValueError, sequence.index, [])
     reversed_iterator = reversed(sequence)
     self.assertEqual(list(reversed_iterator), list(sequence)[::-1])
     self.assertRaises(StopIteration, next, reversed_iterator)
+    expected_list[0] = 'change value'
+    self.assertNotEqual(expected_list, sequence)
+    # TODO(jieluo): Change __repr__ support for DescriptorSequence.
+    if api_implementation.Type() == 'python':
+      self.assertEqual(str(list(sequence)), str(sequence))
+    else:
+      self.assertEqual(str(sequence)[0], '<')
 
   def CheckDescriptorMapping(self, mapping):
     # Verifies that a property like 'messageDescriptor.fields' has all the
     # properties of an immutable abc.Mapping.
+    self.assertNotEqual(
+        mapping, unittest_pb2.TestAllExtensions.DESCRIPTOR.fields_by_name)
+    self.assertNotEqual(mapping, {})
+    self.assertNotEqual(mapping, 1)
+    self.assertFalse(mapping == 1)  # Only for cpp test coverage
+    excepted_dict = dict(mapping.items())
+    self.assertEqual(mapping, excepted_dict)
+    self.assertEqual(mapping, mapping)
     self.assertGreater(len(mapping), 0)  # Sized
-    self.assertEqual(len(mapping), len(list(mapping)))  # Iterable
+    self.assertEqual(len(mapping), len(excepted_dict))  # Iterable
     if sys.version_info >= (3,):
       key, item = next(iter(mapping.items()))
     else:
       key, item = mapping.items()[0]
     self.assertIn(key, mapping)  # Container
     self.assertEqual(mapping.get(key), item)
+    with self.assertRaises(TypeError):
+      mapping.get()
+    # TODO(jieluo): Fix python and cpp extension diff.
+    if api_implementation.Type() == 'python':
+      self.assertRaises(TypeError, mapping.get, [])
+    else:
+      self.assertEqual(None, mapping.get([]))
     # keys(), iterkeys() &co
     item = (next(iter(mapping.keys())), next(iter(mapping.values())))
     self.assertEqual(item, next(iter(mapping.items())))
@@ -497,6 +582,18 @@ class GeneratedDescriptorTest(unittest.TestCase):
       CheckItems(mapping.keys(), mapping.iterkeys())
       CheckItems(mapping.values(), mapping.itervalues())
       CheckItems(mapping.items(), mapping.iteritems())
+    excepted_dict[key] = 'change value'
+    self.assertNotEqual(mapping, excepted_dict)
+    del excepted_dict[key]
+    excepted_dict['new_key'] = 'new'
+    self.assertNotEqual(mapping, excepted_dict)
+    self.assertRaises(KeyError, mapping.__getitem__, 'key_error')
+    self.assertRaises(KeyError, mapping.__getitem__, len(mapping) + 1)
+    # TODO(jieluo): Add __repr__ support for DescriptorMapping.
+    if api_implementation.Type() == 'python':
+      self.assertEqual(len(str(dict(mapping.items()))), len(str(mapping)))
+    else:
+      self.assertEqual(str(mapping)[0], '<')
 
   def testDescriptor(self):
     message_descriptor = unittest_pb2.TestAllTypes.DESCRIPTOR
@@ -506,13 +603,26 @@ class GeneratedDescriptorTest(unittest.TestCase):
     field_descriptor = message_descriptor.fields_by_camelcase_name[
         'optionalInt32']
     self.CheckFieldDescriptor(field_descriptor)
+    enum_descriptor = unittest_pb2.DESCRIPTOR.enum_types_by_name[
+        'ForeignEnum']
+    self.assertEqual(None, enum_descriptor.containing_type)
+    # Test extension range
+    self.assertEqual(
+        unittest_pb2.TestAllExtensions.DESCRIPTOR.extension_ranges,
+        [(1, 536870912)])
+    self.assertEqual(
+        unittest_pb2.TestMultipleExtensionRanges.DESCRIPTOR.extension_ranges,
+        [(42, 43), (4143, 4244), (65536, 536870912)])
 
   def testCppDescriptorContainer(self):
-    # Check that the collection is still valid even if the parent disappeared.
-    enum = unittest_pb2.TestAllTypes.DESCRIPTOR.enum_types_by_name['NestedEnum']
-    values = enum.values
-    del enum
-    self.assertEqual('FOO', values[0].name)
+    containing_file = unittest_pb2.DESCRIPTOR
+    self.CheckDescriptorSequence(containing_file.dependencies)
+    self.CheckDescriptorMapping(containing_file.message_types_by_name)
+    self.CheckDescriptorMapping(containing_file.enum_types_by_name)
+    self.CheckDescriptorMapping(containing_file.services_by_name)
+    self.CheckDescriptorMapping(containing_file.extensions_by_name)
+    self.CheckDescriptorMapping(
+        unittest_pb2.TestNestedExtension.DESCRIPTOR.extensions_by_name)
 
   def testCppDescriptorContainer_Iterator(self):
     # Same test with the iterator
@@ -521,6 +631,24 @@ class GeneratedDescriptorTest(unittest.TestCase):
     del enum
     self.assertEqual('FOO', next(values_iter).name)
 
+  def testServiceDescriptor(self):
+    service_descriptor = unittest_pb2.DESCRIPTOR.services_by_name['TestService']
+    self.assertEqual(service_descriptor.name, 'TestService')
+    self.assertEqual(service_descriptor.methods[0].name, 'Foo')
+    self.assertIs(service_descriptor.file, unittest_pb2.DESCRIPTOR)
+    self.assertEqual(service_descriptor.index, 0)
+    self.CheckDescriptorMapping(service_descriptor.methods_by_name)
+
+  def testOneofDescriptor(self):
+    message_descriptor = unittest_pb2.TestAllTypes.DESCRIPTOR
+    oneof_descriptor = message_descriptor.oneofs_by_name['oneof_field']
+    self.assertFalse(oneof_descriptor.has_options)
+    self.assertEqual(message_descriptor, oneof_descriptor.containing_type)
+    self.assertEqual('oneof_field', oneof_descriptor.name)
+    self.assertEqual('protobuf_unittest.TestAllTypes.oneof_field',
+                     oneof_descriptor.full_name)
+    self.assertEqual(0, oneof_descriptor.index)
+
 
 class DescriptorCopyToProtoTest(unittest.TestCase):
   """Tests for CopyTo functions of Descriptor."""
@@ -614,6 +742,19 @@ class DescriptorCopyToProtoTest(unittest.TestCase):
           deprecated: true
         >
       >
+      field {
+        name: "deprecated_int32_in_oneof"
+        number: 2
+        label: LABEL_OPTIONAL
+        type: TYPE_INT32
+        options {
+          deprecated: true
+        }
+        oneof_index: 0
+      }
+      oneof_decl {
+        name: "oneof_fields"
+      }
       """
 
     self._InternalTestCopyToProto(
@@ -657,49 +798,64 @@ class DescriptorCopyToProtoTest(unittest.TestCase):
         descriptor_pb2.DescriptorProto,
         TEST_MESSAGE_WITH_SEVERAL_EXTENSIONS_ASCII)
 
-  # Disable this test so we can make changes to the proto file.
-  # TODO(xiaofeng): Enable this test after cl/55530659 is submitted.
-  #
-  # def testCopyToProto_FileDescriptor(self):
-  #   UNITTEST_IMPORT_FILE_DESCRIPTOR_ASCII = ("""
-  #     name: 'google/protobuf/unittest_import.proto'
-  #     package: 'protobuf_unittest_import'
-  #     dependency: 'google/protobuf/unittest_import_public.proto'
-  #     message_type: <
-  #       name: 'ImportMessage'
-  #       field: <
-  #         name: 'd'
-  #         number: 1
-  #         label: 1  # Optional
-  #         type: 5  # TYPE_INT32
-  #       >
-  #     >
-  #     """ +
-  #     """enum_type: <
-  #       name: 'ImportEnum'
-  #       value: <
-  #         name: 'IMPORT_FOO'
-  #         number: 7
-  #       >
-  #       value: <
-  #         name: 'IMPORT_BAR'
-  #         number: 8
-  #       >
-  #       value: <
-  #         name: 'IMPORT_BAZ'
-  #         number: 9
-  #       >
-  #     >
-  #     options: <
-  #       java_package: 'com.google.protobuf.test'
-  #       optimize_for: 1  # SPEED
-  #     >
-  #     public_dependency: 0
-  #  """)
-  #  self._InternalTestCopyToProto(
-  #      unittest_import_pb2.DESCRIPTOR,
-  #      descriptor_pb2.FileDescriptorProto,
-  #      UNITTEST_IMPORT_FILE_DESCRIPTOR_ASCII)
+  def testCopyToProto_FileDescriptor(self):
+    UNITTEST_IMPORT_FILE_DESCRIPTOR_ASCII = ("""
+      name: 'google/protobuf/unittest_import.proto'
+      package: 'protobuf_unittest_import'
+      dependency: 'google/protobuf/unittest_import_public.proto'
+      message_type: <
+        name: 'ImportMessage'
+        field: <
+          name: 'd'
+          number: 1
+          label: 1  # Optional
+          type: 5  # TYPE_INT32
+        >
+      >
+      """ +
+      """enum_type: <
+        name: 'ImportEnum'
+        value: <
+          name: 'IMPORT_FOO'
+          number: 7
+        >
+        value: <
+          name: 'IMPORT_BAR'
+          number: 8
+        >
+        value: <
+          name: 'IMPORT_BAZ'
+          number: 9
+        >
+      >
+      enum_type: <
+        name: 'ImportEnumForMap'
+        value: <
+          name: 'UNKNOWN'
+          number: 0
+        >
+        value: <
+          name: 'FOO'
+          number: 1
+        >
+        value: <
+          name: 'BAR'
+          number: 2
+        >
+      >
+      options: <
+        java_package: 'com.google.protobuf.test'
+        optimize_for: 1  # SPEED
+      """ +
+      """
+        cc_enable_arenas: true
+      >
+      public_dependency: 0
+    """)
+    self._InternalTestCopyToProto(
+        unittest_import_pb2.DESCRIPTOR,
+        descriptor_pb2.FileDescriptorProto,
+        UNITTEST_IMPORT_FILE_DESCRIPTOR_ASCII)
 
   def testCopyToProto_ServiceDescriptor(self):
     TEST_SERVICE_ASCII = """
@@ -715,12 +871,47 @@ class DescriptorCopyToProtoTest(unittest.TestCase):
         output_type: '.protobuf_unittest.BarResponse'
       >
       """
-    # TODO(rocking): enable this test after the proto descriptor change is
-    # checked in.
-    #self._InternalTestCopyToProto(
-    #    unittest_pb2.TestService.DESCRIPTOR,
-    #    descriptor_pb2.ServiceDescriptorProto,
-    #    TEST_SERVICE_ASCII)
+    self._InternalTestCopyToProto(
+        unittest_pb2.TestService.DESCRIPTOR,
+        descriptor_pb2.ServiceDescriptorProto,
+        TEST_SERVICE_ASCII)
+
+  @unittest.skipIf(
+      api_implementation.Type() == 'python',
+      'It is not implemented in python.')
+  # TODO(jieluo): Add support for pure python or remove in c extension.
+  def testCopyToProto_MethodDescriptor(self):
+    expected_ascii = """
+      name: 'Foo'
+      input_type: '.protobuf_unittest.FooRequest'
+      output_type: '.protobuf_unittest.FooResponse'
+    """
+    method_descriptor = unittest_pb2.TestService.DESCRIPTOR.FindMethodByName(
+        'Foo')
+    self._InternalTestCopyToProto(
+        method_descriptor,
+        descriptor_pb2.MethodDescriptorProto,
+        expected_ascii)
+
+  @unittest.skipIf(
+      api_implementation.Type() == 'python',
+      'Pure python does not raise error.')
+  # TODO(jieluo): Fix pure python to check with the proto type.
+  def testCopyToProto_TypeError(self):
+    file_proto = descriptor_pb2.FileDescriptorProto()
+    self.assertRaises(TypeError,
+                      unittest_pb2.TestEmptyMessage.DESCRIPTOR.CopyToProto,
+                      file_proto)
+    self.assertRaises(TypeError,
+                      unittest_pb2.ForeignEnum.DESCRIPTOR.CopyToProto,
+                      file_proto)
+    self.assertRaises(TypeError,
+                      unittest_pb2.TestService.DESCRIPTOR.CopyToProto,
+                      file_proto)
+    proto = descriptor_pb2.DescriptorProto()
+    self.assertRaises(TypeError,
+                      unittest_import_pb2.DESCRIPTOR.CopyToProto,
+                      proto)
 
 
 class MakeDescriptorTest(unittest.TestCase):
@@ -768,6 +959,9 @@ class MakeDescriptorTest(unittest.TestCase):
                      result.nested_types[0].enum_types[0])
     self.assertFalse(result.has_options)
     self.assertFalse(result.fields[0].has_options)
+    if api_implementation.Type() == 'cpp':
+      with self.assertRaises(AttributeError):
+        result.fields[0].has_options = False
 
   def testMakeDescriptorWithUnsignedIntField(self):
     file_descriptor_proto = descriptor_pb2.FileDescriptorProto()
diff --git a/python/google/protobuf/internal/encoder.py b/python/google/protobuf/internal/encoder.py
index 48ef2df3..0d1f49dd 100755
--- a/python/google/protobuf/internal/encoder.py
+++ b/python/google/protobuf/internal/encoder.py
@@ -340,7 +340,7 @@ def MessageSetItemSizer(field_number):
 # Map is special: it needs custom logic to compute its size properly.
 
 
-def MapSizer(field_descriptor):
+def MapSizer(field_descriptor, is_message_map):
   """Returns a sizer for a map field."""
 
   # Can't look at field_descriptor.message_type._concrete_class because it may
@@ -355,9 +355,12 @@ def MapSizer(field_descriptor):
       # It's wasteful to create the messages and throw them away one second
       # later since we'll do the same for the actual encode.  But there's not an
       # obvious way to avoid this within the current design without tons of code
-      # duplication.
+      # duplication. For message map, value.ByteSize() should be called to
+      # update the status.
       entry_msg = message_type._concrete_class(key=key, value=value)
       total += message_sizer(entry_msg)
+      if is_message_map:
+        value.ByteSize()
     return total
 
   return FieldSize
@@ -369,7 +372,7 @@ def MapSizer(field_descriptor):
 def _VarintEncoder():
   """Return an encoder for a basic varint value (does not include tag)."""
 
-  def EncodeVarint(write, value):
+  def EncodeVarint(write, value, unused_deterministic=None):
     bits = value & 0x7f
     value >>= 7
     while value:
@@ -385,7 +388,7 @@ def _SignedVarintEncoder():
   """Return an encoder for a basic signed varint value (does not include
   tag)."""
 
-  def EncodeSignedVarint(write, value):
+  def EncodeSignedVarint(write, value, unused_deterministic=None):
     if value < 0:
       value += (1 << 64)
     bits = value & 0x7f
@@ -408,14 +411,15 @@ def _VarintBytes(value):
   called at startup time so it doesn't need to be fast."""
 
   pieces = []
-  _EncodeVarint(pieces.append, value)
+  _EncodeVarint(pieces.append, value, True)
   return b"".join(pieces)
 
 
 def TagBytes(field_number, wire_type):
   """Encode the given tag and return the bytes.  Only called at startup."""
 
-  return _VarintBytes(wire_format.PackTag(field_number, wire_type))
+  return six.binary_type(
+      _VarintBytes(wire_format.PackTag(field_number, wire_type)))
 
 # --------------------------------------------------------------------
 # As with sizers (see above), we have a number of common encoder
@@ -437,27 +441,27 @@ def _SimpleEncoder(wire_type, encode_value, compute_value_size):
     if is_packed:
       tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
       local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
+      def EncodePackedField(write, value, deterministic):
         write(tag_bytes)
         size = 0
         for element in value:
           size += compute_value_size(element)
-        local_EncodeVarint(write, size)
+        local_EncodeVarint(write, size, deterministic)
         for element in value:
-          encode_value(write, element)
+          encode_value(write, element, deterministic)
       return EncodePackedField
     elif is_repeated:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
+      def EncodeRepeatedField(write, value, deterministic):
         for element in value:
           write(tag_bytes)
-          encode_value(write, element)
+          encode_value(write, element, deterministic)
       return EncodeRepeatedField
     else:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
+      def EncodeField(write, value, deterministic):
         write(tag_bytes)
-        return encode_value(write, value)
+        return encode_value(write, value, deterministic)
       return EncodeField
 
   return SpecificEncoder
@@ -471,27 +475,27 @@ def _ModifiedEncoder(wire_type, encode_value, compute_value_size, modify_value):
     if is_packed:
       tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
       local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
+      def EncodePackedField(write, value, deterministic):
         write(tag_bytes)
         size = 0
         for element in value:
           size += compute_value_size(modify_value(element))
-        local_EncodeVarint(write, size)
+        local_EncodeVarint(write, size, deterministic)
         for element in value:
-          encode_value(write, modify_value(element))
+          encode_value(write, modify_value(element), deterministic)
       return EncodePackedField
     elif is_repeated:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
+      def EncodeRepeatedField(write, value, deterministic):
         for element in value:
           write(tag_bytes)
-          encode_value(write, modify_value(element))
+          encode_value(write, modify_value(element), deterministic)
       return EncodeRepeatedField
     else:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
+      def EncodeField(write, value, deterministic):
         write(tag_bytes)
-        return encode_value(write, modify_value(value))
+        return encode_value(write, modify_value(value), deterministic)
       return EncodeField
 
   return SpecificEncoder
@@ -512,22 +516,22 @@ def _StructPackEncoder(wire_type, format):
     if is_packed:
       tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
       local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
+      def EncodePackedField(write, value, deterministic):
         write(tag_bytes)
-        local_EncodeVarint(write, len(value) * value_size)
+        local_EncodeVarint(write, len(value) * value_size, deterministic)
         for element in value:
           write(local_struct_pack(format, element))
       return EncodePackedField
     elif is_repeated:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
+      def EncodeRepeatedField(write, value, unused_deterministic=None):
         for element in value:
           write(tag_bytes)
           write(local_struct_pack(format, element))
       return EncodeRepeatedField
     else:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
+      def EncodeField(write, value, unused_deterministic=None):
         write(tag_bytes)
         return write(local_struct_pack(format, value))
       return EncodeField
@@ -578,9 +582,9 @@ def _FloatingPointEncoder(wire_type, format):
     if is_packed:
       tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
       local_EncodeVarint = _EncodeVarint
-      def EncodePackedField(write, value):
+      def EncodePackedField(write, value, deterministic):
         write(tag_bytes)
-        local_EncodeVarint(write, len(value) * value_size)
+        local_EncodeVarint(write, len(value) * value_size, deterministic)
         for element in value:
           # This try/except block is going to be faster than any code that
           # we could write to check whether element is finite.
@@ -591,7 +595,7 @@ def _FloatingPointEncoder(wire_type, format):
       return EncodePackedField
     elif is_repeated:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeRepeatedField(write, value):
+      def EncodeRepeatedField(write, value, unused_deterministic=None):
         for element in value:
           write(tag_bytes)
           try:
@@ -601,7 +605,7 @@ def _FloatingPointEncoder(wire_type, format):
       return EncodeRepeatedField
     else:
       tag_bytes = TagBytes(field_number, wire_type)
-      def EncodeField(write, value):
+      def EncodeField(write, value, unused_deterministic=None):
         write(tag_bytes)
         try:
           write(local_struct_pack(format, value))
@@ -647,9 +651,9 @@ def BoolEncoder(field_number, is_repeated, is_packed):
   if is_packed:
     tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
     local_EncodeVarint = _EncodeVarint
-    def EncodePackedField(write, value):
+    def EncodePackedField(write, value, deterministic):
       write(tag_bytes)
-      local_EncodeVarint(write, len(value))
+      local_EncodeVarint(write, len(value), deterministic)
       for element in value:
         if element:
           write(true_byte)
@@ -658,7 +662,7 @@ def BoolEncoder(field_number, is_repeated, is_packed):
     return EncodePackedField
   elif is_repeated:
     tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
-    def EncodeRepeatedField(write, value):
+    def EncodeRepeatedField(write, value, unused_deterministic=None):
       for element in value:
         write(tag_bytes)
         if element:
@@ -668,7 +672,7 @@ def BoolEncoder(field_number, is_repeated, is_packed):
     return EncodeRepeatedField
   else:
     tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
-    def EncodeField(write, value):
+    def EncodeField(write, value, unused_deterministic=None):
       write(tag_bytes)
       if value:
         return write(true_byte)
@@ -684,18 +688,18 @@ def StringEncoder(field_number, is_repeated, is_packed):
   local_len = len
   assert not is_packed
   if is_repeated:
-    def EncodeRepeatedField(write, value):
+    def EncodeRepeatedField(write, value, deterministic):
       for element in value:
         encoded = element.encode('utf-8')
         write(tag)
-        local_EncodeVarint(write, local_len(encoded))
+        local_EncodeVarint(write, local_len(encoded), deterministic)
         write(encoded)
     return EncodeRepeatedField
   else:
-    def EncodeField(write, value):
+    def EncodeField(write, value, deterministic):
       encoded = value.encode('utf-8')
       write(tag)
-      local_EncodeVarint(write, local_len(encoded))
+      local_EncodeVarint(write, local_len(encoded), deterministic)
       return write(encoded)
     return EncodeField
 
@@ -708,16 +712,16 @@ def BytesEncoder(field_number, is_repeated, is_packed):
   local_len = len
   assert not is_packed
   if is_repeated:
-    def EncodeRepeatedField(write, value):
+    def EncodeRepeatedField(write, value, deterministic):
       for element in value:
         write(tag)
-        local_EncodeVarint(write, local_len(element))
+        local_EncodeVarint(write, local_len(element), deterministic)
         write(element)
     return EncodeRepeatedField
   else:
-    def EncodeField(write, value):
+    def EncodeField(write, value, deterministic):
       write(tag)
-      local_EncodeVarint(write, local_len(value))
+      local_EncodeVarint(write, local_len(value), deterministic)
       return write(value)
     return EncodeField
 
@@ -729,16 +733,16 @@ def GroupEncoder(field_number, is_repeated, is_packed):
   end_tag = TagBytes(field_number, wire_format.WIRETYPE_END_GROUP)
   assert not is_packed
   if is_repeated:
-    def EncodeRepeatedField(write, value):
+    def EncodeRepeatedField(write, value, deterministic):
       for element in value:
         write(start_tag)
-        element._InternalSerialize(write)
+        element._InternalSerialize(write, deterministic)
         write(end_tag)
     return EncodeRepeatedField
   else:
-    def EncodeField(write, value):
+    def EncodeField(write, value, deterministic):
       write(start_tag)
-      value._InternalSerialize(write)
+      value._InternalSerialize(write, deterministic)
       return write(end_tag)
     return EncodeField
 
@@ -750,17 +754,17 @@ def MessageEncoder(field_number, is_repeated, is_packed):
   local_EncodeVarint = _EncodeVarint
   assert not is_packed
   if is_repeated:
-    def EncodeRepeatedField(write, value):
+    def EncodeRepeatedField(write, value, deterministic):
       for element in value:
         write(tag)
-        local_EncodeVarint(write, element.ByteSize())
-        element._InternalSerialize(write)
+        local_EncodeVarint(write, element.ByteSize(), deterministic)
+        element._InternalSerialize(write, deterministic)
     return EncodeRepeatedField
   else:
-    def EncodeField(write, value):
+    def EncodeField(write, value, deterministic):
       write(tag)
-      local_EncodeVarint(write, value.ByteSize())
-      return value._InternalSerialize(write)
+      local_EncodeVarint(write, value.ByteSize(), deterministic)
+      return value._InternalSerialize(write, deterministic)
     return EncodeField
 
 
@@ -787,10 +791,10 @@ def MessageSetItemEncoder(field_number):
   end_bytes = TagBytes(1, wire_format.WIRETYPE_END_GROUP)
   local_EncodeVarint = _EncodeVarint
 
-  def EncodeField(write, value):
+  def EncodeField(write, value, deterministic):
     write(start_bytes)
-    local_EncodeVarint(write, value.ByteSize())
-    value._InternalSerialize(write)
+    local_EncodeVarint(write, value.ByteSize(), deterministic)
+    value._InternalSerialize(write, deterministic)
     return write(end_bytes)
 
   return EncodeField
@@ -815,9 +819,10 @@ def MapEncoder(field_descriptor):
   message_type = field_descriptor.message_type
   encode_message = MessageEncoder(field_descriptor.number, False, False)
 
-  def EncodeField(write, value):
-    for key in value:
+  def EncodeField(write, value, deterministic):
+    value_keys = sorted(value.keys()) if deterministic else value
+    for key in value_keys:
       entry_msg = message_type._concrete_class(key=key, value=value[key])
-      encode_message(write, entry_msg)
+      encode_message(write, entry_msg, deterministic)
 
   return EncodeField
diff --git a/python/google/protobuf/internal/factory_test2.proto b/python/google/protobuf/internal/factory_test2.proto
index bb1b54ad..5fcbc5ac 100644
--- a/python/google/protobuf/internal/factory_test2.proto
+++ b/python/google/protobuf/internal/factory_test2.proto
@@ -97,3 +97,8 @@ message MessageWithNestedEnumOnly {
 extend Factory1Message {
   optional string another_field = 1002;
 }
+
+message MessageWithOption {
+  option no_standard_descriptor_accessor = true;
+  optional int32 field1 = 1;
+}
diff --git a/python/google/protobuf/internal/json_format_test.py b/python/google/protobuf/internal/json_format_test.py
index 5ed65622..d891dce1 100644
--- a/python/google/protobuf/internal/json_format_test.py
+++ b/python/google/protobuf/internal/json_format_test.py
@@ -49,6 +49,8 @@ from google.protobuf import field_mask_pb2
 from google.protobuf import struct_pb2
 from google.protobuf import timestamp_pb2
 from google.protobuf import wrappers_pb2
+from google.protobuf import unittest_mset_pb2
+from google.protobuf import unittest_pb2
 from google.protobuf.internal import well_known_types
 from google.protobuf import json_format
 from google.protobuf.util import json_format_proto3_pb2
@@ -158,6 +160,98 @@ class JsonFormatTest(JsonFormatBase):
     json_format.Parse(text, parsed_message)
     self.assertEqual(message, parsed_message)
 
+  def testUnknownEnumToJsonAndBack(self):
+    text = '{\n  "enumValue": 999\n}'
+    message = json_format_proto3_pb2.TestMessage()
+    message.enum_value = 999
+    self.assertEqual(json_format.MessageToJson(message),
+                     text)
+    parsed_message = json_format_proto3_pb2.TestMessage()
+    json_format.Parse(text, parsed_message)
+    self.assertEqual(message, parsed_message)
+
+  def testExtensionToJsonAndBack(self):
+    message = unittest_mset_pb2.TestMessageSetContainer()
+    ext1 = unittest_mset_pb2.TestMessageSetExtension1.message_set_extension
+    ext2 = unittest_mset_pb2.TestMessageSetExtension2.message_set_extension
+    message.message_set.Extensions[ext1].i = 23
+    message.message_set.Extensions[ext2].str = 'foo'
+    message_text = json_format.MessageToJson(
+        message
+    )
+    parsed_message = unittest_mset_pb2.TestMessageSetContainer()
+    json_format.Parse(message_text, parsed_message)
+    self.assertEqual(message, parsed_message)
+
+  def testExtensionErrors(self):
+    self.CheckError('{"[extensionField]": {}}',
+                    'Message type proto3.TestMessage does not have extensions')
+
+  def testExtensionToDictAndBack(self):
+    message = unittest_mset_pb2.TestMessageSetContainer()
+    ext1 = unittest_mset_pb2.TestMessageSetExtension1.message_set_extension
+    ext2 = unittest_mset_pb2.TestMessageSetExtension2.message_set_extension
+    message.message_set.Extensions[ext1].i = 23
+    message.message_set.Extensions[ext2].str = 'foo'
+    message_dict = json_format.MessageToDict(
+        message
+    )
+    parsed_message = unittest_mset_pb2.TestMessageSetContainer()
+    json_format.ParseDict(message_dict, parsed_message)
+    self.assertEqual(message, parsed_message)
+
+  def testExtensionSerializationDictMatchesProto3Spec(self):
+    """See go/proto3-json-spec for spec.
+    """
+    message = unittest_mset_pb2.TestMessageSetContainer()
+    ext1 = unittest_mset_pb2.TestMessageSetExtension1.message_set_extension
+    ext2 = unittest_mset_pb2.TestMessageSetExtension2.message_set_extension
+    message.message_set.Extensions[ext1].i = 23
+    message.message_set.Extensions[ext2].str = 'foo'
+    message_dict = json_format.MessageToDict(
+        message
+    )
+    golden_dict = {
+        'messageSet': {
+            '[protobuf_unittest.'
+            'TestMessageSetExtension1.messageSetExtension]': {
+                'i': 23,
+            },
+            '[protobuf_unittest.'
+            'TestMessageSetExtension2.messageSetExtension]': {
+                'str': u'foo',
+            },
+        },
+    }
+    self.assertEqual(golden_dict, message_dict)
+
+
+  def testExtensionSerializationJsonMatchesProto3Spec(self):
+    """See go/proto3-json-spec for spec.
+    """
+    message = unittest_mset_pb2.TestMessageSetContainer()
+    ext1 = unittest_mset_pb2.TestMessageSetExtension1.message_set_extension
+    ext2 = unittest_mset_pb2.TestMessageSetExtension2.message_set_extension
+    message.message_set.Extensions[ext1].i = 23
+    message.message_set.Extensions[ext2].str = 'foo'
+    message_text = json_format.MessageToJson(
+        message
+    )
+    ext1_text = ('protobuf_unittest.TestMessageSetExtension1.'
+                 'messageSetExtension')
+    ext2_text = ('protobuf_unittest.TestMessageSetExtension2.'
+                 'messageSetExtension')
+    golden_text = ('{"messageSet": {'
+                   '    "[%s]": {'
+                   '        "i": 23'
+                   '    },'
+                   '    "[%s]": {'
+                   '        "str": "foo"'
+                   '    }'
+                   '}}') % (ext1_text, ext2_text)
+    self.assertEqual(json.loads(golden_text), json.loads(message_text))
+
+
   def testJsonEscapeString(self):
     message = json_format_proto3_pb2.TestMessage()
     if sys.version_info[0] < 3:
@@ -215,7 +309,18 @@ class JsonFormatTest(JsonFormatBase):
     self.assertEqual(message.int32_value, 1)
 
   def testMapFields(self):
-    message = json_format_proto3_pb2.TestMap()
+    message = json_format_proto3_pb2.TestNestedMap()
+    self.assertEqual(
+        json.loads(json_format.MessageToJson(message, True)),
+        json.loads('{'
+                   '"boolMap": {},'
+                   '"int32Map": {},'
+                   '"int64Map": {},'
+                   '"uint32Map": {},'
+                   '"uint64Map": {},'
+                   '"stringMap": {},'
+                   '"mapMap": {}'
+                   '}'))
     message.bool_map[True] = 1
     message.bool_map[False] = 2
     message.int32_map[1] = 2
@@ -228,17 +333,19 @@ class JsonFormatTest(JsonFormatBase):
     message.uint64_map[2] = 3
     message.string_map['1'] = 2
     message.string_map['null'] = 3
+    message.map_map['1'].bool_map[True] = 3
     self.assertEqual(
-        json.loads(json_format.MessageToJson(message, True)),
+        json.loads(json_format.MessageToJson(message, False)),
         json.loads('{'
                    '"boolMap": {"false": 2, "true": 1},'
                    '"int32Map": {"1": 2, "2": 3},'
                    '"int64Map": {"1": 2, "2": 3},'
                    '"uint32Map": {"1": 2, "2": 3},'
                    '"uint64Map": {"1": 2, "2": 3},'
-                   '"stringMap": {"1": 2, "null": 3}'
+                   '"stringMap": {"1": 2, "null": 3},'
+                   '"mapMap": {"1": {"boolMap": {"true": 3}}}'
                    '}'))
-    parsed_message = json_format_proto3_pb2.TestMap()
+    parsed_message = json_format_proto3_pb2.TestNestedMap()
     self.CheckParseBack(message, parsed_message)
 
   def testOneofFields(self):
@@ -624,6 +731,9 @@ class JsonFormatTest(JsonFormatBase):
         json_format.Parse,
         '{"repeatedInt32Value":[1, null]}',
         parsed_message)
+    self.CheckError('{"repeatedMessageValue":[null]}',
+                    'Failed to parse repeatedMessageValue field: null is not'
+                    ' allowed to be used as an element in a repeated field.')
 
   def testNanFloat(self):
     message = json_format_proto3_pb2.TestMessage()
@@ -648,6 +758,16 @@ class JsonFormatTest(JsonFormatBase):
         '{"enumValue": "baz"}',
         'Failed to parse enumValue field: Invalid enum value baz '
         'for enum type proto3.EnumType.')
+    # Proto3 accepts numeric unknown enums.
+    text = '{"enumValue": 12345}'
+    json_format.Parse(text, message)
+    # Proto2 does not accept unknown enums.
+    message = unittest_pb2.TestAllTypes()
+    self.assertRaisesRegexp(
+        json_format.ParseError,
+        'Failed to parse optionalNestedEnum field: Invalid enum value 12345 '
+        'for enum type protobuf_unittest.TestAllTypes.NestedEnum.',
+        json_format.Parse, '{"optionalNestedEnum": 12345}', message)
 
   def testParseBadIdentifer(self):
     self.CheckError('{int32Value: 1}',
@@ -720,6 +840,11 @@ class JsonFormatTest(JsonFormatBase):
     self.CheckError('{"bytesValue": "AQI*"}',
                     'Failed to parse bytesValue field: Incorrect padding.')
 
+  def testInvalidRepeated(self):
+    self.CheckError('{"repeatedInt32Value": 12345}',
+                    (r'Failed to parse repeatedInt32Value field: repeated field'
+                     r' repeatedInt32Value must be in \[\] which is 12345.'))
+
   def testInvalidMap(self):
     message = json_format_proto3_pb2.TestMap()
     text = '{"int32Map": {"null": 2, "2": 3}}'
@@ -745,6 +870,12 @@ class JsonFormatTest(JsonFormatBase):
         json_format.ParseError,
         'Failed to load JSON: duplicate key a',
         json_format.Parse, text, message)
+    text = r'{"stringMap": 0}'
+    self.assertRaisesRegexp(
+        json_format.ParseError,
+        'Failed to parse stringMap field: Map field string_map must be '
+        'in a dict which is 0.',
+        json_format.Parse, text, message)
 
   def testInvalidTimestamp(self):
     message = json_format_proto3_pb2.TestTimestamp()
@@ -768,7 +899,7 @@ class JsonFormatTest(JsonFormatBase):
     text = '{"value": "0000-01-01T00:00:00Z"}'
     self.assertRaisesRegexp(
         json_format.ParseError,
-        'Failed to parse value field: year is out of range.',
+        'Failed to parse value field: year (0 )?is out of range.',
         json_format.Parse, text, message)
     # Time bigger than maxinum time.
     message.value.seconds = 253402300800
@@ -832,6 +963,12 @@ class JsonFormatTest(JsonFormatBase):
                      json_format.MessageToJson(message))
     self.assertEqual('{\n  "int32_value": 12345\n}',
                      json_format.MessageToJson(message, False, True))
+    # When including_default_value_fields is True.
+    message = json_format_proto3_pb2.TestTimestamp()
+    self.assertEqual('{\n  "repeatedValue": []\n}',
+                     json_format.MessageToJson(message, True, False))
+    self.assertEqual('{\n  "repeated_value": []\n}',
+                     json_format.MessageToJson(message, True, True))
 
     # Parsers accept both original proto field names and lowerCamelCase names.
     message = json_format_proto3_pb2.TestMessage()
@@ -840,6 +977,24 @@ class JsonFormatTest(JsonFormatBase):
     json_format.Parse('{"int32_value": 12345}', message)
     self.assertEqual(12345, message.int32_value)
 
+  def testIndent(self):
+    message = json_format_proto3_pb2.TestMessage()
+    message.int32_value = 12345
+    self.assertEqual('{\n"int32Value": 12345\n}',
+                     json_format.MessageToJson(message, indent=0))
+
+  def testFormatEnumsAsInts(self):
+    message = json_format_proto3_pb2.TestMessage()
+    message.enum_value = json_format_proto3_pb2.BAR
+    message.repeated_enum_value.append(json_format_proto3_pb2.FOO)
+    message.repeated_enum_value.append(json_format_proto3_pb2.BAR)
+    self.assertEqual(json.loads('{\n'
+                                '  "enumValue": 1,\n'
+                                '  "repeatedEnumValue": [0, 1]\n'
+                                '}\n'),
+                     json.loads(json_format.MessageToJson(
+                         message, use_integers_for_enums=True)))
+
   def testParseDict(self):
     expected = 12345
     js_dict = {'int32Value': expected}
@@ -862,6 +1017,22 @@ class JsonFormatTest(JsonFormatBase):
     parsed_message = json_format_proto3_pb2.TestCustomJsonName()
     self.CheckParseBack(message, parsed_message)
 
+  def testSortKeys(self):
+    # Testing sort_keys is not perfectly working, as by random luck we could
+    # get the output sorted. We just use a selection of names.
+    message = json_format_proto3_pb2.TestMessage(bool_value=True,
+                                                 int32_value=1,
+                                                 int64_value=3,
+                                                 uint32_value=4,
+                                                 string_value='bla')
+    self.assertEqual(
+        json_format.MessageToJson(message, sort_keys=True),
+        # We use json.dumps() instead of a hardcoded string due to differences
+        # between Python 2 and Python 3.
+        json.dumps({'boolValue': True, 'int32Value': 1, 'int64Value': '3',
+                    'uint32Value': 4, 'stringValue': 'bla'},
+                   indent=2, sort_keys=True))
+
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/python/google/protobuf/internal/message_factory_test.py b/python/google/protobuf/internal/message_factory_test.py
index 4caa2443..6df52ed2 100644
--- a/python/google/protobuf/internal/message_factory_test.py
+++ b/python/google/protobuf/internal/message_factory_test.py
@@ -40,6 +40,7 @@ except ImportError:
   import unittest
 
 from google.protobuf import descriptor_pb2
+from google.protobuf.internal import api_implementation
 from google.protobuf.internal import factory_test1_pb2
 from google.protobuf.internal import factory_test2_pb2
 from google.protobuf import descriptor_database
@@ -106,8 +107,17 @@ class MessageFactoryTest(unittest.TestCase):
   def testGetMessages(self):
     # performed twice because multiple calls with the same input must be allowed
     for _ in range(2):
-      messages = message_factory.GetMessages([self.factory_test1_fd,
-                                              self.factory_test2_fd])
+      # GetMessage should work regardless of the order the FileDescriptorProto
+      # are provided. In particular, the function should succeed when the files
+      # are not in the topological order of dependencies.
+
+      # Assuming factory_test2_fd depends on factory_test1_fd.
+      self.assertIn(self.factory_test1_fd.name,
+                    self.factory_test2_fd.dependency)
+      # Get messages should work when a file comes before its dependencies:
+      # factory_test2_fd comes before factory_test1_fd.
+      messages = message_factory.GetMessages([self.factory_test2_fd,
+                                              self.factory_test1_fd])
       self.assertTrue(
           set(['google.protobuf.python.internal.Factory2Message',
                'google.protobuf.python.internal.Factory1Message'],
@@ -130,6 +140,21 @@ class MessageFactoryTest(unittest.TestCase):
       msg1.Extensions[ext2] = 'test2'
       self.assertEqual('test1', msg1.Extensions[ext1])
       self.assertEqual('test2', msg1.Extensions[ext2])
+      self.assertEqual(None,
+                       msg1.Extensions._FindExtensionByNumber(12321))
+      if api_implementation.Type() == 'cpp':
+        # TODO(jieluo): Fix len to return the correct value.
+        # self.assertEqual(2, len(msg1.Extensions))
+        self.assertEqual(len(msg1.Extensions), len(msg1.Extensions))
+        self.assertRaises(TypeError,
+                          msg1.Extensions._FindExtensionByName, 0)
+        self.assertRaises(TypeError,
+                          msg1.Extensions._FindExtensionByNumber, '')
+      else:
+        self.assertEqual(None,
+                         msg1.Extensions._FindExtensionByName(0))
+        self.assertEqual(None,
+                         msg1.Extensions._FindExtensionByNumber(''))
 
   def testDuplicateExtensionNumber(self):
     pool = descriptor_pool.DescriptorPool()
@@ -183,7 +208,14 @@ class MessageFactoryTest(unittest.TestCase):
     with self.assertRaises(Exception) as cm:
       factory.GetMessages([f.name])
 
-    self.assertIsInstance(cm.exception, (AssertionError, ValueError))
+    self.assertIn(str(cm.exception),
+                  ['Extensions '
+                   '"google.protobuf.python.internal.Duplicate.extension_field" and'
+                   ' "google.protobuf.python.internal.Extension.extension_field"'
+                   ' both try to extend message type'
+                   ' "google.protobuf.python.internal.Container"'
+                   ' with field number 2.',
+                   'Double registration of Extensions'])
 
 
 if __name__ == '__main__':
diff --git a/python/google/protobuf/internal/message_test.py b/python/google/protobuf/internal/message_test.py
index 9986c0d9..61a56a67 100755
--- a/python/google/protobuf/internal/message_test.py
+++ b/python/google/protobuf/internal/message_test.py
@@ -51,12 +51,18 @@ import operator
 import pickle
 import six
 import sys
+import warnings
 
 try:
-  import unittest2 as unittest  #PY26
+  import unittest2 as unittest  # PY26
 except ImportError:
   import unittest
+try:
+  cmp                                   # Python 2
+except NameError:
+  cmp = lambda x, y: (x > y) - (x < y)  # Python 3
 
+from google.protobuf import map_proto2_unittest_pb2
 from google.protobuf import map_unittest_pb2
 from google.protobuf import unittest_pb2
 from google.protobuf import unittest_proto3_arena_pb2
@@ -65,6 +71,7 @@ from google.protobuf import descriptor_pool
 from google.protobuf import message_factory
 from google.protobuf import text_format
 from google.protobuf.internal import api_implementation
+from google.protobuf.internal import encoder
 from google.protobuf.internal import packed_field_test_pb2
 from google.protobuf.internal import test_util
 from google.protobuf.internal import testing_refleaks
@@ -92,7 +99,7 @@ def IsNegInf(val):
 BaseTestCase = testing_refleaks.BaseTestCase
 
 
-@_parameterized.NamedParameters(
+@_parameterized.named_parameters(
     ('_proto2', unittest_pb2),
     ('_proto3', unittest_proto3_arena_pb2))
 class MessageTest(BaseTestCase):
@@ -136,6 +143,63 @@ class MessageTest(BaseTestCase):
     golden_copy = copy.deepcopy(golden_message)
     self.assertEqual(golden_data, golden_copy.SerializeToString())
 
+  def testParseErrors(self, message_module):
+    msg = message_module.TestAllTypes()
+    self.assertRaises(TypeError, msg.FromString, 0)
+    self.assertRaises(Exception, msg.FromString, '0')
+    # TODO(jieluo): Fix cpp extension to raise error instead of warning.
+    # b/27494216
+    end_tag = encoder.TagBytes(1, 4)
+    if api_implementation.Type() == 'python':
+      with self.assertRaises(message.DecodeError) as context:
+        msg.FromString(end_tag)
+      self.assertEqual('Unexpected end-group tag.', str(context.exception))
+    else:
+      with warnings.catch_warnings(record=True) as w:
+        # Cause all warnings to always be triggered.
+        warnings.simplefilter('always')
+        msg.FromString(end_tag)
+        assert len(w) == 1
+        assert issubclass(w[-1].category, RuntimeWarning)
+        self.assertEqual('Unexpected end-group tag: Not all data was converted',
+                         str(w[-1].message))
+
+  def testDeterminismParameters(self, message_module):
+    # This message is always deterministically serialized, even if determinism
+    # is disabled, so we can use it to verify that all the determinism
+    # parameters work correctly.
+    golden_data = (b'\xe2\x02\nOne string'
+                   b'\xe2\x02\nTwo string'
+                   b'\xe2\x02\nRed string'
+                   b'\xe2\x02\x0bBlue string')
+    golden_message = message_module.TestAllTypes()
+    golden_message.repeated_string.extend([
+        'One string',
+        'Two string',
+        'Red string',
+        'Blue string',
+    ])
+    self.assertEqual(golden_data,
+                     golden_message.SerializeToString(deterministic=None))
+    self.assertEqual(golden_data,
+                     golden_message.SerializeToString(deterministic=False))
+    self.assertEqual(golden_data,
+                     golden_message.SerializeToString(deterministic=True))
+
+    class BadArgError(Exception):
+      pass
+
+    class BadArg(object):
+
+      def __nonzero__(self):
+        raise BadArgError()
+
+      def __bool__(self):
+        raise BadArgError()
+
+    with self.assertRaises(BadArgError):
+      golden_message.SerializeToString(deterministic=BadArg())
+
   def testPickleSupport(self, message_module):
     golden_data = test_util.GoldenFileData('golden_message')
     golden_message = message_module.TestAllTypes()
@@ -377,6 +441,7 @@ class MessageTest(BaseTestCase):
     self.assertEqual(message.repeated_int32[0], 1)
     self.assertEqual(message.repeated_int32[1], 2)
     self.assertEqual(message.repeated_int32[2], 3)
+    self.assertEqual(str(message.repeated_int32), str([1, 2, 3]))
 
     message.repeated_float.append(1.1)
     message.repeated_float.append(1.3)
@@ -393,6 +458,7 @@ class MessageTest(BaseTestCase):
     self.assertEqual(message.repeated_string[0], 'a')
     self.assertEqual(message.repeated_string[1], 'b')
     self.assertEqual(message.repeated_string[2], 'c')
+    self.assertEqual(str(message.repeated_string), str([u'a', u'b', u'c']))
 
     message.repeated_bytes.append(b'a')
     message.repeated_bytes.append(b'c')
@@ -401,6 +467,7 @@ class MessageTest(BaseTestCase):
     self.assertEqual(message.repeated_bytes[0], b'a')
     self.assertEqual(message.repeated_bytes[1], b'b')
     self.assertEqual(message.repeated_bytes[2], b'c')
+    self.assertEqual(str(message.repeated_bytes), str([b'a', b'b', b'c']))
 
   def testSortingRepeatedScalarFieldsCustomComparator(self, message_module):
     """Check some different types with custom comparator."""
@@ -439,6 +506,8 @@ class MessageTest(BaseTestCase):
     self.assertEqual(message.repeated_nested_message[3].bb, 4)
     self.assertEqual(message.repeated_nested_message[4].bb, 5)
     self.assertEqual(message.repeated_nested_message[5].bb, 6)
+    self.assertEqual(str(message.repeated_nested_message),
+                     '[bb: 1\n, bb: 2\n, bb: 3\n, bb: 4\n, bb: 5\n, bb: 6\n]')
 
   def testSortingRepeatedCompositeFieldsStable(self, message_module):
     """Check passing a custom comparator to sort a repeated composite field."""
@@ -564,6 +633,18 @@ class MessageTest(BaseTestCase):
     self.assertIsInstance(m.repeated_nested_message,
                           collections.MutableSequence)
 
+  def testRepeatedFieldsNotHashable(self, message_module):
+    m = message_module.TestAllTypes()
+    with self.assertRaises(TypeError):
+      hash(m.repeated_int32)
+    with self.assertRaises(TypeError):
+      hash(m.repeated_nested_message)
+
+  def testRepeatedFieldInsideNestedMessage(self, message_module):
+    m = message_module.NestedTestAllTypes()
+    m.payload.repeated_int32.extend([])
+    self.assertTrue(m.HasField('payload'))
+
   def ensureNestedMessageExists(self, msg, attribute):
     """Make sure that a nested message object exists.
 
@@ -576,6 +657,7 @@ class MessageTest(BaseTestCase):
   def testOneofGetCaseNonexistingField(self, message_module):
     m = message_module.TestAllTypes()
     self.assertRaises(ValueError, m.WhichOneof, 'no_such_oneof_field')
+    self.assertRaises(Exception, m.WhichOneof, 0)
 
   def testOneofDefaultValues(self, message_module):
     m = message_module.TestAllTypes()
@@ -951,6 +1033,8 @@ class MessageTest(BaseTestCase):
     m = message_module.TestAllTypes()
     with self.assertRaises(IndexError) as _:
       m.repeated_nested_message.pop()
+    with self.assertRaises(TypeError) as _:
+      m.repeated_nested_message.pop('0')
     for i in range(5):
       n = m.repeated_nested_message.add()
       n.bb = i
@@ -959,6 +1043,39 @@ class MessageTest(BaseTestCase):
     self.assertEqual(2, m.repeated_nested_message.pop(1).bb)
     self.assertEqual([1, 3], [n.bb for n in m.repeated_nested_message])
 
+  def testRepeatedCompareWithSelf(self, message_module):
+    m = message_module.TestAllTypes()
+    for i in range(5):
+      m.repeated_int32.insert(i, i)
+      n = m.repeated_nested_message.add()
+      n.bb = i
+    self.assertSequenceEqual(m.repeated_int32, m.repeated_int32)
+    self.assertEqual(m.repeated_nested_message, m.repeated_nested_message)
+
+  def testReleasedNestedMessages(self, message_module):
+    """A case that lead to a segfault when a message detached from its parent
+    container has itself a child container.
+    """
+    m = message_module.NestedTestAllTypes()
+    m = m.repeated_child.add()
+    m = m.child
+    m = m.repeated_child.add()
+    self.assertEqual(m.payload.optional_int32, 0)
+
+  def testSetRepeatedComposite(self, message_module):
+    m = message_module.TestAllTypes()
+    with self.assertRaises(AttributeError):
+      m.repeated_int32 = []
+    m.repeated_int32.append(1)
+    if api_implementation.Type() == 'cpp':
+      # For test coverage: cpp has a different path if composite
+      # field is in cache
+      with self.assertRaises(TypeError):
+        m.repeated_int32 = []
+    else:
+      with self.assertRaises(AttributeError):
+        m.repeated_int32 = []
+
 
 # Class to test proto2-only features (required, extensions, etc.)
 class Proto2Test(BaseTestCase):
@@ -1011,18 +1128,46 @@ class Proto2Test(BaseTestCase):
     self.assertEqual(False, message.optional_bool)
     self.assertEqual(0, message.optional_nested_message.bb)
 
-  # TODO(tibell): The C++ implementations actually allows assignment
-  # of unknown enum values to *scalar* fields (but not repeated
-  # fields). Once checked enum fields becomes the default in the
-  # Python implementation, the C++ implementation should follow suit.
   def testAssignInvalidEnum(self):
-    """It should not be possible to assign an invalid enum number to an
-    enum field."""
+    """Assigning an invalid enum number is not allowed in proto2."""
     m = unittest_pb2.TestAllTypes()
 
+    # Proto2 can not assign unknown enum.
     with self.assertRaises(ValueError) as _:
       m.optional_nested_enum = 1234567
     self.assertRaises(ValueError, m.repeated_nested_enum.append, 1234567)
+    # Assignment is a different code path than append for the C++ impl.
+    m.repeated_nested_enum.append(2)
+    m.repeated_nested_enum[0] = 2
+    with self.assertRaises(ValueError):
+      m.repeated_nested_enum[0] = 123456
+
+    # Unknown enum value can be parsed but is ignored.
+    m2 = unittest_proto3_arena_pb2.TestAllTypes()
+    m2.optional_nested_enum = 1234567
+    m2.repeated_nested_enum.append(7654321)
+    serialized = m2.SerializeToString()
+
+    m3 = unittest_pb2.TestAllTypes()
+    m3.ParseFromString(serialized)
+    self.assertFalse(m3.HasField('optional_nested_enum'))
+    # 1 is the default value for optional_nested_enum.
+    self.assertEqual(1, m3.optional_nested_enum)
+    self.assertEqual(0, len(m3.repeated_nested_enum))
+    m2.Clear()
+    m2.ParseFromString(m3.SerializeToString())
+    self.assertEqual(1234567, m2.optional_nested_enum)
+    self.assertEqual(7654321, m2.repeated_nested_enum[0])
+
+  def testUnknownEnumMap(self):
+    m = map_proto2_unittest_pb2.TestEnumMap()
+    m.known_map_field[123] = 0
+    with self.assertRaises(ValueError):
+      m.unknown_map_field[1] = 123
+
+  def testExtensionsErrors(self):
+    msg = unittest_pb2.TestAllTypes()
+    self.assertRaises(AttributeError, getattr, msg, 'Extensions')
 
   def testGoldenExtensions(self):
     golden_data = test_util.GoldenFileData('golden_message')
@@ -1247,6 +1392,7 @@ class Proto3Test(BaseTestCase):
     """Assigning an unknown enum value is allowed and preserves the value."""
     m = unittest_proto3_arena_pb2.TestAllTypes()
 
+    # Proto3 can assign unknown enums.
     m.optional_nested_enum = 1234567
     self.assertEqual(1234567, m.optional_nested_enum)
     m.repeated_nested_enum.append(22334455)
@@ -1264,7 +1410,7 @@ class Proto3Test(BaseTestCase):
   # Map isn't really a proto3-only feature. But there is no proto2 equivalent
   # of google/protobuf/map_unittest.proto right now, so it's not easy to
   # test both with the same test like we do for the other proto2/proto3 tests.
-  # (google/protobuf/map_protobuf_unittest.proto is very different in the set
+  # (google/protobuf/map_proto2_unittest.proto is very different in the set
   # of messages and fields it contains).
   def testScalarMapDefaults(self):
     msg = map_unittest_pb2.TestMap()
@@ -1325,12 +1471,17 @@ class Proto3Test(BaseTestCase):
 
     msg.map_int32_int32[5] = 15
     self.assertEqual(15, msg.map_int32_int32.get(5))
+    self.assertEqual(15, msg.map_int32_int32.get(5))
+    with self.assertRaises(TypeError):
+      msg.map_int32_int32.get('')
 
     self.assertIsNone(msg.map_int32_foreign_message.get(5))
     self.assertEqual(10, msg.map_int32_foreign_message.get(5, 10))
 
     submsg = msg.map_int32_foreign_message[5]
     self.assertIs(submsg, msg.map_int32_foreign_message.get(5))
+    with self.assertRaises(TypeError):
+      msg.map_int32_foreign_message.get('')
 
   def testScalarMap(self):
     msg = map_unittest_pb2.TestMap()
@@ -1342,8 +1493,13 @@ class Proto3Test(BaseTestCase):
     msg.map_int64_int64[-2**33] = -2**34
     msg.map_uint32_uint32[123] = 456
     msg.map_uint64_uint64[2**33] = 2**34
+    msg.map_int32_float[2] = 1.2
+    msg.map_int32_double[1] = 3.3
     msg.map_string_string['abc'] = '123'
+    msg.map_bool_bool[True] = True
     msg.map_int32_enum[888] = 2
+    # Unknown numeric enum is supported in proto3.
+    msg.map_int32_enum[123] = 456
 
     self.assertEqual([], msg.FindInitializationErrors())
 
@@ -1377,8 +1533,24 @@ class Proto3Test(BaseTestCase):
     self.assertEqual(-2**34, msg2.map_int64_int64[-2**33])
     self.assertEqual(456, msg2.map_uint32_uint32[123])
     self.assertEqual(2**34, msg2.map_uint64_uint64[2**33])
+    self.assertAlmostEqual(1.2, msg.map_int32_float[2])
+    self.assertEqual(3.3, msg.map_int32_double[1])
     self.assertEqual('123', msg2.map_string_string['abc'])
+    self.assertEqual(True, msg2.map_bool_bool[True])
     self.assertEqual(2, msg2.map_int32_enum[888])
+    self.assertEqual(456, msg2.map_int32_enum[123])
+    # TODO(jieluo): Add cpp extension support.
+    if api_implementation.Type() == 'python':
+      self.assertEqual('{-123: -456}',
+                       str(msg2.map_int32_int32))
+
+  def testMapEntryAlwaysSerialized(self):
+    msg = map_unittest_pb2.TestMap()
+    msg.map_int32_int32[0] = 0
+    msg.map_string_string[''] = ''
+    self.assertEqual(msg.ByteSize(), 12)
+    self.assertEqual(b'\n\x04\x08\x00\x10\x00r\x04\n\x00\x12\x00',
+                     msg.SerializeToString())
 
   def testStringUnicodeConversionInMap(self):
     msg = map_unittest_pb2.TestMap()
@@ -1431,6 +1603,40 @@ class Proto3Test(BaseTestCase):
     self.assertIn(123, msg2.map_int32_foreign_message)
     self.assertIn(-456, msg2.map_int32_foreign_message)
     self.assertEqual(2, len(msg2.map_int32_foreign_message))
+    # TODO(jieluo): Fix text format for message map.
+    # TODO(jieluo): Add cpp extension support.
+    if api_implementation.Type() == 'python':
+      self.assertEqual(15,
+                       len(str(msg2.map_int32_foreign_message)))
+
+  def testNestedMessageMapItemDelete(self):
+    msg = map_unittest_pb2.TestMap()
+    msg.map_int32_all_types[1].optional_nested_message.bb = 1
+    del msg.map_int32_all_types[1]
+    msg.map_int32_all_types[2].optional_nested_message.bb = 2
+    self.assertEqual(1, len(msg.map_int32_all_types))
+    msg.map_int32_all_types[1].optional_nested_message.bb = 1
+    self.assertEqual(2, len(msg.map_int32_all_types))
+
+    serialized = msg.SerializeToString()
+    msg2 = map_unittest_pb2.TestMap()
+    msg2.ParseFromString(serialized)
+    keys = [1, 2]
+    # The loop triggers PyErr_Occurred() in c extension.
+    for key in keys:
+      del msg2.map_int32_all_types[key]
+
+  def testMapByteSize(self):
+    msg = map_unittest_pb2.TestMap()
+    msg.map_int32_int32[1] = 1
+    size = msg.ByteSize()
+    msg.map_int32_int32[1] = 128
+    self.assertEqual(msg.ByteSize(), size + 1)
+
+    msg.map_int32_foreign_message[19].c = 1
+    size = msg.ByteSize()
+    msg.map_int32_foreign_message[19].c = 128
+    self.assertEqual(msg.ByteSize(), size + 1)
 
   def testMergeFrom(self):
     msg = map_unittest_pb2.TestMap()
@@ -1456,7 +1662,15 @@ class Proto3Test(BaseTestCase):
     self.assertEqual(5, msg2.map_int32_foreign_message[111].c)
     self.assertEqual(10, msg2.map_int32_foreign_message[222].c)
     self.assertFalse(msg2.map_int32_foreign_message[222].HasField('d'))
-    self.assertEqual(15, old_map_value.c)
+    if api_implementation.Type() != 'cpp':
+      # During the call to MergeFrom(), the C++ implementation will have
+      # deallocated the underlying message, but this is very difficult to detect
+      # properly. The line below is likely to cause a segmentation fault.
+      # With the Python implementation, old_map_value is just 'detached' from
+      # the main message. Using it will not crash of course, but since it still
+      # have a reference to the parent message I'm sure we can find interesting
+      # ways to cause inconsistencies.
+      self.assertEqual(15, old_map_value.c)
 
     # Verify that there is only one entry per key, even though the MergeFrom
     # may have internally created multiple entries for a single key in the
@@ -1477,6 +1691,35 @@ class Proto3Test(BaseTestCase):
 
     del msg2.map_int32_foreign_message[222]
     self.assertFalse(222 in msg2.map_int32_foreign_message)
+    with self.assertRaises(TypeError):
+      del msg2.map_int32_foreign_message['']
+
+  def testMapMergeFrom(self):
+    msg = map_unittest_pb2.TestMap()
+    msg.map_int32_int32[12] = 34
+    msg.map_int32_int32[56] = 78
+    msg.map_int64_int64[22] = 33
+    msg.map_int32_foreign_message[111].c = 5
+    msg.map_int32_foreign_message[222].c = 10
+
+    msg2 = map_unittest_pb2.TestMap()
+    msg2.map_int32_int32[12] = 55
+    msg2.map_int64_int64[88] = 99
+    msg2.map_int32_foreign_message[222].c = 15
+    msg2.map_int32_foreign_message[222].d = 20
+
+    msg2.map_int32_int32.MergeFrom(msg.map_int32_int32)
+    self.assertEqual(34, msg2.map_int32_int32[12])
+    self.assertEqual(78, msg2.map_int32_int32[56])
+
+    msg2.map_int64_int64.MergeFrom(msg.map_int64_int64)
+    self.assertEqual(33, msg2.map_int64_int64[22])
+    self.assertEqual(99, msg2.map_int64_int64[88])
+
+    msg2.map_int32_foreign_message.MergeFrom(msg.map_int32_foreign_message)
+    self.assertEqual(5, msg2.map_int32_foreign_message[111].c)
+    self.assertEqual(10, msg2.map_int32_foreign_message[222].c)
+    self.assertFalse(msg2.map_int32_foreign_message[222].HasField('d'))
 
   def testMergeFromBadType(self):
     msg = map_unittest_pb2.TestMap()
@@ -1611,6 +1854,54 @@ class Proto3Test(BaseTestCase):
     matching_dict = {2: 4, 3: 6, 4: 8}
     self.assertMapIterEquals(msg.map_int32_int32.items(), matching_dict)
 
+  def testPython2Map(self):
+    if sys.version_info < (3,):
+      msg = map_unittest_pb2.TestMap()
+      msg.map_int32_int32[2] = 4
+      msg.map_int32_int32[3] = 6
+      msg.map_int32_int32[4] = 8
+      msg.map_int32_int32[5] = 10
+      map_int32 = msg.map_int32_int32
+      self.assertEqual(4, len(map_int32))
+      msg2 = map_unittest_pb2.TestMap()
+      msg2.ParseFromString(msg.SerializeToString())
+
+      def CheckItems(seq, iterator):
+        self.assertEqual(next(iterator), seq[0])
+        self.assertEqual(list(iterator), seq[1:])
+
+      CheckItems(map_int32.items(), map_int32.iteritems())
+      CheckItems(map_int32.keys(), map_int32.iterkeys())
+      CheckItems(map_int32.values(), map_int32.itervalues())
+
+      self.assertEqual(6, map_int32.get(3))
+      self.assertEqual(None, map_int32.get(999))
+      self.assertEqual(6, map_int32.pop(3))
+      self.assertEqual(0, map_int32.pop(3))
+      self.assertEqual(3, len(map_int32))
+      key, value = map_int32.popitem()
+      self.assertEqual(2 * key, value)
+      self.assertEqual(2, len(map_int32))
+      map_int32.clear()
+      self.assertEqual(0, len(map_int32))
+
+      with self.assertRaises(KeyError):
+        map_int32.popitem()
+
+      self.assertEqual(0, map_int32.setdefault(2))
+      self.assertEqual(1, len(map_int32))
+
+      map_int32.update(msg2.map_int32_int32)
+      self.assertEqual(4, len(map_int32))
+
+      with self.assertRaises(TypeError):
+        map_int32.update(msg2.map_int32_int32,
+                         msg2.map_int32_int32)
+      with self.assertRaises(TypeError):
+        map_int32.update(0)
+      with self.assertRaises(TypeError):
+        map_int32.update(value=12)
+
   def testMapItems(self):
     # Map items used to have strange behaviors when use c extension. Because
     # [] may reorder the map and invalidate any exsting iterators.
@@ -1626,6 +1917,35 @@ class Proto3Test(BaseTestCase):
     items2 = msg.map_string_string.items()
     self.assertEqual(items1, items2)
 
+  def testMapDeterministicSerialization(self):
+    golden_data = (b'r\x0c\n\x07init_op\x12\x01d'
+                   b'r\n\n\x05item1\x12\x01e'
+                   b'r\n\n\x05item2\x12\x01f'
+                   b'r\n\n\x05item3\x12\x01g'
+                   b'r\x0b\n\x05item4\x12\x02QQ'
+                   b'r\x12\n\rlocal_init_op\x12\x01a'
+                   b'r\x0e\n\tsummaries\x12\x01e'
+                   b'r\x18\n\x13trainable_variables\x12\x01b'
+                   b'r\x0e\n\tvariables\x12\x01c')
+    msg = map_unittest_pb2.TestMap()
+    msg.map_string_string['local_init_op'] = 'a'
+    msg.map_string_string['trainable_variables'] = 'b'
+    msg.map_string_string['variables'] = 'c'
+    msg.map_string_string['init_op'] = 'd'
+    msg.map_string_string['summaries'] = 'e'
+    msg.map_string_string['item1'] = 'e'
+    msg.map_string_string['item2'] = 'f'
+    msg.map_string_string['item3'] = 'g'
+    msg.map_string_string['item4'] = 'QQ'
+
+    # If deterministic serialization is not working correctly, this will be
+    # "flaky" depending on the exact python dict hash seed.
+    #
+    # Fortunately, there are enough items in this map that it is extremely
+    # unlikely to ever hit the "right" in-order combination, so the test
+    # itself should fail reliably.
+    self.assertEqual(golden_data, msg.SerializeToString(deterministic=True))
+
   def testMapIterationClearMessage(self):
     # Iterator needs to work even if message and map are deleted.
     msg = map_unittest_pb2.TestMap()
@@ -1712,6 +2032,9 @@ class Proto3Test(BaseTestCase):
     del msg.map_int32_int32[4]
     self.assertEqual(0, len(msg.map_int32_int32))
 
+    with self.assertRaises(KeyError):
+      del msg.map_int32_all_types[32]
+
   def testMapsAreMapping(self):
     msg = map_unittest_pb2.TestMap()
     self.assertIsInstance(msg.map_int32_int32, collections.Mapping)
@@ -1720,6 +2043,14 @@ class Proto3Test(BaseTestCase):
     self.assertIsInstance(msg.map_int32_foreign_message,
                           collections.MutableMapping)
 
+  def testMapsCompare(self):
+    msg = map_unittest_pb2.TestMap()
+    msg.map_int32_int32[-123] = -456
+    self.assertEqual(msg.map_int32_int32, msg.map_int32_int32)
+    self.assertEqual(msg.map_int32_foreign_message,
+                     msg.map_int32_foreign_message)
+    self.assertNotEqual(msg.map_int32_int32, 0)
+
   def testMapFindInitializationErrorsSmokeTest(self):
     msg = map_unittest_pb2.TestMap()
     msg.map_string_string['abc'] = '123'
@@ -1807,8 +2138,9 @@ class PackedFieldTest(BaseTestCase):
     self.assertEqual(golden_data, message.SerializeToString())
 
 
-@unittest.skipIf(api_implementation.Type() != 'cpp',
-                 'explicit tests of the C++ implementation')
+@unittest.skipIf(api_implementation.Type() != 'cpp' or
+                 sys.version_info < (2, 7),
+                 'explicit tests of the C++ implementation for PY27 and above')
 class OversizeProtosTest(BaseTestCase):
 
   @classmethod
diff --git a/python/google/protobuf/internal/more_extensions_dynamic.proto b/python/google/protobuf/internal/more_extensions_dynamic.proto
index 11f85ef6..98fcbcb6 100644
--- a/python/google/protobuf/internal/more_extensions_dynamic.proto
+++ b/python/google/protobuf/internal/more_extensions_dynamic.proto
@@ -47,4 +47,5 @@ message DynamicMessageType {
 extend ExtendedMessage {
   optional int32 dynamic_int32_extension = 100;
   optional DynamicMessageType dynamic_message_extension = 101;
+  repeated DynamicMessageType repeated_dynamic_message_extension = 102;
 }
diff --git a/python/google/protobuf/internal/no_package.proto b/python/google/protobuf/internal/no_package.proto
new file mode 100644
index 00000000..3546dcc3
--- /dev/null
+++ b/python/google/protobuf/internal/no_package.proto
@@ -0,0 +1,10 @@
+syntax = "proto2";
+
+enum NoPackageEnum {
+  NO_PACKAGE_VALUE_0 = 0;
+  NO_PACKAGE_VALUE_1 = 1;
+}
+
+message NoPackageMessage {
+  optional NoPackageEnum no_package_enum = 1;
+}
diff --git a/python/google/protobuf/internal/python_message.py b/python/google/protobuf/internal/python_message.py
index 4b701039..975e3b4d 100755
--- a/python/google/protobuf/internal/python_message.py
+++ b/python/google/protobuf/internal/python_message.py
@@ -58,6 +58,7 @@ import weakref
 import six
 
 # We use "as" to avoid name collisions with variables.
+from google.protobuf.internal import api_implementation
 from google.protobuf.internal import containers
 from google.protobuf.internal import decoder
 from google.protobuf.internal import encoder
@@ -288,7 +289,8 @@ def _AttachFieldHelpers(cls, field_descriptor):
 
   if is_map_entry:
     field_encoder = encoder.MapEncoder(field_descriptor)
-    sizer = encoder.MapSizer(field_descriptor)
+    sizer = encoder.MapSizer(field_descriptor,
+                             _IsMessageMapField(field_descriptor))
   elif _IsMessageSetExtension(field_descriptor):
     field_encoder = encoder.MessageSetItemEncoder(field_descriptor.number)
     sizer = encoder.MessageSetItemSizer(field_descriptor.number)
@@ -891,7 +893,7 @@ def _AddHasExtensionMethod(cls):
 def _InternalUnpackAny(msg):
   """Unpacks Any message and returns the unpacked message.
 
-  This internal method is differnt from public Any Unpack method which takes
+  This internal method is different from public Any Unpack method which takes
   the target message as argument. _InternalUnpackAny method does not have
   target message type and need to find the message type in descriptor pool.
 
@@ -1008,11 +1010,16 @@ def _AddByteSizeMethod(message_descriptor, cls):
       return self._cached_byte_size
 
     size = 0
-    for field_descriptor, field_value in self.ListFields():
-      size += field_descriptor._sizer(field_value)
-
-    for tag_bytes, value_bytes in self._unknown_fields:
-      size += len(tag_bytes) + len(value_bytes)
+    descriptor = self.DESCRIPTOR
+    if descriptor.GetOptions().map_entry:
+      # Fields of map entry should always be serialized.
+      size = descriptor.fields_by_name['key']._sizer(self.key)
+      size += descriptor.fields_by_name['value']._sizer(self.value)
+    else:
+      for field_descriptor, field_value in self.ListFields():
+        size += field_descriptor._sizer(field_value)
+      for tag_bytes, value_bytes in self._unknown_fields:
+        size += len(tag_bytes) + len(value_bytes)
 
     self._cached_byte_size = size
     self._cached_byte_size_dirty = False
@@ -1025,32 +1032,46 @@ def _AddByteSizeMethod(message_descriptor, cls):
 def _AddSerializeToStringMethod(message_descriptor, cls):
   """Helper for _AddMessageMethods()."""
 
-  def SerializeToString(self):
+  def SerializeToString(self, **kwargs):
     # Check if the message has all of its required fields set.
     errors = []
     if not self.IsInitialized():
       raise message_mod.EncodeError(
           'Message %s is missing required fields: %s' % (
           self.DESCRIPTOR.full_name, ','.join(self.FindInitializationErrors())))
-    return self.SerializePartialToString()
+    return self.SerializePartialToString(**kwargs)
   cls.SerializeToString = SerializeToString
 
 
 def _AddSerializePartialToStringMethod(message_descriptor, cls):
   """Helper for _AddMessageMethods()."""
 
-  def SerializePartialToString(self):
+  def SerializePartialToString(self, **kwargs):
     out = BytesIO()
-    self._InternalSerialize(out.write)
+    self._InternalSerialize(out.write, **kwargs)
     return out.getvalue()
   cls.SerializePartialToString = SerializePartialToString
 
-  def InternalSerialize(self, write_bytes):
-    for field_descriptor, field_value in self.ListFields():
-      field_descriptor._encoder(write_bytes, field_value)
-    for tag_bytes, value_bytes in self._unknown_fields:
-      write_bytes(tag_bytes)
-      write_bytes(value_bytes)
+  def InternalSerialize(self, write_bytes, deterministic=None):
+    if deterministic is None:
+      deterministic = (
+          api_implementation.IsPythonDefaultSerializationDeterministic())
+    else:
+      deterministic = bool(deterministic)
+
+    descriptor = self.DESCRIPTOR
+    if descriptor.GetOptions().map_entry:
+      # Fields of map entry should always be serialized.
+      descriptor.fields_by_name['key']._encoder(
+          write_bytes, self.key, deterministic)
+      descriptor.fields_by_name['value']._encoder(
+          write_bytes, self.value, deterministic)
+    else:
+      for field_descriptor, field_value in self.ListFields():
+        field_descriptor._encoder(write_bytes, field_value, deterministic)
+      for tag_bytes, value_bytes in self._unknown_fields:
+        write_bytes(tag_bytes)
+        write_bytes(value_bytes)
   cls._InternalSerialize = InternalSerialize
 
 
@@ -1088,7 +1109,8 @@ def _AddMergeFromStringMethod(message_descriptor, cls):
         new_pos = local_SkipField(buffer, new_pos, end, tag_bytes)
         if new_pos == -1:
           return pos
-        if not is_proto3:
+        if (not is_proto3 or
+            api_implementation.GetPythonProto3PreserveUnknownsDefault()):
           if not unknown_field_list:
             unknown_field_list = self._unknown_fields = []
           unknown_field_list.append(
diff --git a/src/google/protobuf/stubs/atomic_sequence_num.h b/python/google/protobuf/internal/python_protobuf.cc
index bb20942f..f90cc438 100644
--- a/src/google/protobuf/stubs/atomic_sequence_num.h
+++ b/python/google/protobuf/internal/python_protobuf.cc
@@ -1,5 +1,5 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2014 Google Inc.  All rights reserved.
+// Copyright 2008 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -27,28 +27,37 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#ifndef GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_
-#define GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_
 
-#include <google/protobuf/stubs/atomicops.h>
+// Author: qrczak@google.com (Marcin Kowalczyk)
+
+#include <google/protobuf/python/python_protobuf.h>
 
 namespace google {
 namespace protobuf {
-namespace internal {
+namespace python {
+
+static const Message* GetCProtoInsidePyProtoStub(PyObject* msg) {
+  return NULL;
+}
+static Message* MutableCProtoInsidePyProtoStub(PyObject* msg) {
+  return NULL;
+}
 
-class SequenceNumber {
- public:
-  SequenceNumber() : word_(0) {}
+// This is initialized with a default, stub implementation.
+// If python-google.protobuf.cc is loaded, the function pointer is overridden
+// with a full implementation.
+const Message* (*GetCProtoInsidePyProtoPtr)(PyObject* msg) =
+    GetCProtoInsidePyProtoStub;
+Message* (*MutableCProtoInsidePyProtoPtr)(PyObject* msg) =
+    MutableCProtoInsidePyProtoStub;
 
-  AtomicWord GetNext() {
-    return NoBarrier_AtomicIncrement(&word_, 1) - 1;
-  }
- private:
-  AtomicWord word_;
-};
+const Message* GetCProtoInsidePyProto(PyObject* msg) {
+  return GetCProtoInsidePyProtoPtr(msg);
+}
+Message* MutableCProtoInsidePyProto(PyObject* msg) {
+  return MutableCProtoInsidePyProtoPtr(msg);
+}
 
-}  // namespace internal
+}  // namespace python
 }  // namespace protobuf
 }  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMIC_SEQUENCE_NUM_H_
diff --git a/python/google/protobuf/internal/reflection_test.py b/python/google/protobuf/internal/reflection_test.py
index 0e881015..0306ff46 100755
--- a/python/google/protobuf/internal/reflection_test.py
+++ b/python/google/protobuf/internal/reflection_test.py
@@ -620,6 +620,14 @@ class ReflectionTest(BaseTestCase):
     self.assertRaises(TypeError, setattr, proto, 'optional_int32', 'foo')
     self.assertRaises(TypeError, setattr, proto, 'optional_string', 10)
     self.assertRaises(TypeError, setattr, proto, 'optional_bytes', 10)
+    self.assertRaises(TypeError, setattr, proto, 'optional_bool', 'foo')
+    self.assertRaises(TypeError, setattr, proto, 'optional_float', 'foo')
+    self.assertRaises(TypeError, setattr, proto, 'optional_double', 'foo')
+    # TODO(jieluo): Fix type checking difference for python and c extension
+    if api_implementation.Type() == 'python':
+      self.assertRaises(TypeError, setattr, proto, 'optional_bool', 1.1)
+    else:
+      proto.optional_bool = 1.1
 
   def assertIntegerTypes(self, integer_fn):
     """Verifies setting of scalar integers.
@@ -686,8 +694,10 @@ class ReflectionTest(BaseTestCase):
       self.assertEqual(expected_min, getattr(pb, field_name))
       setattr(pb, field_name, expected_max)
       self.assertEqual(expected_max, getattr(pb, field_name))
-      self.assertRaises(ValueError, setattr, pb, field_name, expected_min - 1)
-      self.assertRaises(ValueError, setattr, pb, field_name, expected_max + 1)
+      self.assertRaises((ValueError, TypeError), setattr, pb, field_name,
+                        expected_min - 1)
+      self.assertRaises((ValueError, TypeError), setattr, pb, field_name,
+                        expected_max + 1)
 
     TestMinAndMaxIntegers('optional_int32', -(1 << 31), (1 << 31) - 1)
     TestMinAndMaxIntegers('optional_uint32', 0, 0xffffffff)
@@ -696,7 +706,7 @@ class ReflectionTest(BaseTestCase):
     # A bit of white-box testing since -1 is an int and not a long in C++ and
     # so goes down a different path.
     pb = unittest_pb2.TestAllTypes()
-    with self.assertRaises(ValueError):
+    with self.assertRaises((ValueError, TypeError)):
       pb.optional_uint64 = integer_fn(-(1 << 63))
 
     pb = unittest_pb2.TestAllTypes()
@@ -720,6 +730,12 @@ class ReflectionTest(BaseTestCase):
     proto.repeated_int32[0] = 23
     self.assertRaises(IndexError, proto.repeated_int32.__setitem__, 500, 23)
     self.assertRaises(TypeError, proto.repeated_int32.__setitem__, 0, 'abc')
+    self.assertRaises(TypeError, proto.repeated_int32.__setitem__, 0, [])
+    self.assertRaises(TypeError, proto.repeated_int32.__setitem__,
+                      'index', 23)
+
+    proto.repeated_string.append('2')
+    self.assertRaises(TypeError, proto.repeated_string.__setitem__, 0, 10)
 
     # Repeated enums tests.
     #proto.repeated_nested_enum.append(0)
@@ -1007,6 +1023,14 @@ class ReflectionTest(BaseTestCase):
     self.assertEqual(4, len(proto.repeated_nested_message))
     self.assertEqual(n1, proto.repeated_nested_message[2])
     self.assertEqual(n2, proto.repeated_nested_message[3])
+    self.assertRaises(TypeError,
+                      proto.repeated_nested_message.extend, n1)
+    self.assertRaises(TypeError,
+                      proto.repeated_nested_message.extend, [0])
+    wrong_message_type = unittest_pb2.TestAllTypes()
+    self.assertRaises(TypeError,
+                      proto.repeated_nested_message.extend,
+                      [wrong_message_type])
 
     # Test clearing.
     proto.ClearField('repeated_nested_message')
@@ -1018,6 +1042,8 @@ class ReflectionTest(BaseTestCase):
     self.assertEqual(1, len(proto.repeated_nested_message))
     self.assertEqual(23, proto.repeated_nested_message[0].bb)
     self.assertRaises(TypeError, proto.repeated_nested_message.add, 23)
+    with self.assertRaises(Exception):
+      proto.repeated_nested_message[0] = 23
 
   def testRepeatedCompositeRemove(self):
     proto = unittest_pb2.TestAllTypes()
@@ -1551,7 +1577,14 @@ class ReflectionTest(BaseTestCase):
     container = copy.deepcopy(proto1.repeated_int32)
     self.assertEqual([2, 3], container)
 
-    # TODO(anuraag): Implement deepcopy for repeated composite / extension dict
+    message1 = proto1.repeated_nested_message.add()
+    message1.bb = 1
+    messages = copy.deepcopy(proto1.repeated_nested_message)
+    self.assertEqual(proto1.repeated_nested_message, messages)
+    message1.bb = 2
+    self.assertNotEqual(proto1.repeated_nested_message, messages)
+
+    # TODO(anuraag): Implement deepcopy for extension dict
 
   def testClear(self):
     proto = unittest_pb2.TestAllTypes()
@@ -1635,8 +1668,11 @@ class ReflectionTest(BaseTestCase):
     proto.SerializeToString()
     proto.SerializePartialToString()
 
-  def assertNotInitialized(self, proto):
+  def assertNotInitialized(self, proto, error_size=None):
+    errors = []
     self.assertFalse(proto.IsInitialized())
+    self.assertFalse(proto.IsInitialized(errors))
+    self.assertEqual(error_size, len(errors))
     self.assertRaises(message.EncodeError, proto.SerializeToString)
     # "Partial" serialization doesn't care if message is uninitialized.
     proto.SerializePartialToString()
@@ -1650,7 +1686,7 @@ class ReflectionTest(BaseTestCase):
 
     # The case of uninitialized required fields.
     proto = unittest_pb2.TestRequired()
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 3)
     proto.a = proto.b = proto.c = 2
     self.assertInitialized(proto)
 
@@ -1658,14 +1694,14 @@ class ReflectionTest(BaseTestCase):
     proto = unittest_pb2.TestRequiredForeign()
     self.assertInitialized(proto)
     proto.optional_message.a = 1
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 2)
     proto.optional_message.b = 0
     proto.optional_message.c = 0
     self.assertInitialized(proto)
 
     # Uninitialized repeated submessage.
     message1 = proto.repeated_message.add()
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 3)
     message1.a = message1.b = message1.c = 0
     self.assertInitialized(proto)
 
@@ -1674,11 +1710,11 @@ class ReflectionTest(BaseTestCase):
     extension = unittest_pb2.TestRequired.multi
     message1 = proto.Extensions[extension].add()
     message2 = proto.Extensions[extension].add()
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 6)
     message1.a = 1
     message1.b = 1
     message1.c = 1
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 3)
     message2.a = 2
     message2.b = 2
     message2.c = 2
@@ -1688,7 +1724,7 @@ class ReflectionTest(BaseTestCase):
     proto = unittest_pb2.TestAllExtensions()
     extension = unittest_pb2.TestRequired.single
     proto.Extensions[extension].a = 1
-    self.assertNotInitialized(proto)
+    self.assertNotInitialized(proto, 2)
     proto.Extensions[extension].b = 2
     proto.Extensions[extension].c = 3
     self.assertInitialized(proto)
@@ -2147,6 +2183,8 @@ class ByteSizeTest(BaseTestCase):
     foreign_message_1 = self.proto.repeated_nested_message.add()
     foreign_message_1.bb = 9
     self.assertEqual(2 + 1 + 2 + 1 + 1 + 1, self.Size())
+    repeated_nested_message = copy.deepcopy(
+        self.proto.repeated_nested_message)
 
     # 2 bytes tag plus 1 byte length plus 1 byte bb tag 1 byte int.
     del self.proto.repeated_nested_message[0]
@@ -2167,6 +2205,16 @@ class ByteSizeTest(BaseTestCase):
     del self.proto.repeated_nested_message[0]
     self.assertEqual(0, self.Size())
 
+    self.assertEqual(2, len(repeated_nested_message))
+    del repeated_nested_message[0:1]
+    # TODO(jieluo): Fix cpp extension bug when delete repeated message.
+    if api_implementation.Type() == 'python':
+      self.assertEqual(1, len(repeated_nested_message))
+    del repeated_nested_message[-1]
+    # TODO(jieluo): Fix cpp extension bug when delete repeated message.
+    if api_implementation.Type() == 'python':
+      self.assertEqual(0, len(repeated_nested_message))
+
   def testRepeatedGroups(self):
     # 2-byte START_GROUP plus 2-byte END_GROUP.
     group_0 = self.proto.repeatedgroup.add()
@@ -2183,6 +2231,10 @@ class ByteSizeTest(BaseTestCase):
     proto.Extensions[extension] = 23
     # 1 byte for tag, 1 byte for value.
     self.assertEqual(2, proto.ByteSize())
+    field = unittest_pb2.TestAllTypes.DESCRIPTOR.fields_by_name[
+        'optional_int32']
+    with self.assertRaises(KeyError):
+      proto.Extensions[field] = 23
 
   def testCacheInvalidationForNonrepeatedScalar(self):
     # Test non-extension.
diff --git a/python/google/protobuf/internal/service_reflection_test.py b/python/google/protobuf/internal/service_reflection_test.py
index 62900b1d..77239f44 100755
--- a/python/google/protobuf/internal/service_reflection_test.py
+++ b/python/google/protobuf/internal/service_reflection_test.py
@@ -82,6 +82,10 @@ class FooUnitTest(unittest.TestCase):
     service_descriptor = unittest_pb2.TestService.GetDescriptor()
     srvc.CallMethod(service_descriptor.methods[1], rpc_controller,
                     unittest_pb2.BarRequest(), MyCallback)
+    self.assertTrue(srvc.GetRequestClass(service_descriptor.methods[1]) is
+                    unittest_pb2.BarRequest)
+    self.assertTrue(srvc.GetResponseClass(service_descriptor.methods[1]) is
+                    unittest_pb2.BarResponse)
     self.assertEqual('Method Bar not implemented.',
                      rpc_controller.failure_message)
     self.assertEqual(None, self.callback_response)
diff --git a/python/google/protobuf/internal/symbol_database_test.py b/python/google/protobuf/internal/symbol_database_test.py
index 4f5173b2..af42681a 100644
--- a/python/google/protobuf/internal/symbol_database_test.py
+++ b/python/google/protobuf/internal/symbol_database_test.py
@@ -60,6 +60,7 @@ class SymbolDatabaseTest(unittest.TestCase):
     db.RegisterMessage(unittest_pb2.TestAllTypes.RepeatedGroup)
     db.RegisterEnumDescriptor(unittest_pb2.ForeignEnum.DESCRIPTOR)
     db.RegisterEnumDescriptor(unittest_pb2.TestAllTypes.NestedEnum.DESCRIPTOR)
+    db.RegisterServiceDescriptor(unittest_pb2._TESTSERVICE)
     return db
 
   def testGetPrototype(self):
@@ -109,7 +110,13 @@ class SymbolDatabaseTest(unittest.TestCase):
         self._Database().pool.FindMessageTypeByName(
             'protobuf_unittest.TestAllTypes.NestedMessage').full_name)
 
-  def testFindFindContainingSymbol(self):
+  def testFindServiceByName(self):
+    self.assertEqual(
+        'protobuf_unittest.TestService',
+        self._Database().pool.FindServiceByName(
+            'protobuf_unittest.TestService').full_name)
+
+  def testFindFileContainingSymbol(self):
     # Lookup based on either enum or message.
     self.assertEqual(
         'google/protobuf/unittest.proto',
diff --git a/python/google/protobuf/internal/test_util.py b/python/google/protobuf/internal/test_util.py
index 269d0e2d..a6e34ef5 100755
--- a/python/google/protobuf/internal/test_util.py
+++ b/python/google/protobuf/internal/test_util.py
@@ -39,11 +39,15 @@ __author__ = 'robinson@google.com (Will Robinson)'
 import numbers
 import operator
 import os.path
-import sys
 
 from google.protobuf import unittest_import_pb2
 from google.protobuf import unittest_pb2
-from google.protobuf import descriptor_pb2
+
+try:
+  long        # Python 2
+except NameError:
+  long = int  # Python 3
+
 
 # Tests whether the given TestAllTypes message is proto2 or not.
 # This is used to gate several fields/features that only exist
@@ -51,6 +55,7 @@ from google.protobuf import descriptor_pb2
 def IsProto2(message):
   return message.DESCRIPTOR.syntax == "proto2"
 
+
 def SetAllNonLazyFields(message):
   """Sets every non-lazy field in the message to a unique value.
 
@@ -128,22 +133,37 @@ def SetAllNonLazyFields(message):
   message.repeated_string_piece.append(u'224')
   message.repeated_cord.append(u'225')
 
-  # Add a second one of each field.
-  message.repeated_int32.append(301)
-  message.repeated_int64.append(302)
-  message.repeated_uint32.append(303)
-  message.repeated_uint64.append(304)
-  message.repeated_sint32.append(305)
-  message.repeated_sint64.append(306)
-  message.repeated_fixed32.append(307)
-  message.repeated_fixed64.append(308)
-  message.repeated_sfixed32.append(309)
-  message.repeated_sfixed64.append(310)
-  message.repeated_float.append(311)
-  message.repeated_double.append(312)
-  message.repeated_bool.append(False)
-  message.repeated_string.append(u'315')
-  message.repeated_bytes.append(b'316')
+  # Add a second one of each field and set value by index.
+  message.repeated_int32.append(0)
+  message.repeated_int64.append(0)
+  message.repeated_uint32.append(0)
+  message.repeated_uint64.append(0)
+  message.repeated_sint32.append(0)
+  message.repeated_sint64.append(0)
+  message.repeated_fixed32.append(0)
+  message.repeated_fixed64.append(0)
+  message.repeated_sfixed32.append(0)
+  message.repeated_sfixed64.append(0)
+  message.repeated_float.append(0)
+  message.repeated_double.append(0)
+  message.repeated_bool.append(True)
+  message.repeated_string.append(u'0')
+  message.repeated_bytes.append(b'0')
+  message.repeated_int32[1] = 301
+  message.repeated_int64[1] = 302
+  message.repeated_uint32[1] = 303
+  message.repeated_uint64[1] = 304
+  message.repeated_sint32[1] = 305
+  message.repeated_sint64[1] = 306
+  message.repeated_fixed32[1] = 307
+  message.repeated_fixed64[1] = 308
+  message.repeated_sfixed32[1] = 309
+  message.repeated_sfixed64[1] = 310
+  message.repeated_float[1] = 311
+  message.repeated_double[1] = 312
+  message.repeated_bool[1] = False
+  message.repeated_string[1] = u'315'
+  message.repeated_bytes[1] = b'316'
 
   if IsProto2(message):
     message.repeatedgroup.add().a = 317
@@ -152,7 +172,8 @@ def SetAllNonLazyFields(message):
   message.repeated_import_message.add().d = 320
   message.repeated_lazy_message.add().bb = 327
 
-  message.repeated_nested_enum.append(unittest_pb2.TestAllTypes.BAZ)
+  message.repeated_nested_enum.append(unittest_pb2.TestAllTypes.BAR)
+  message.repeated_nested_enum[1] = unittest_pb2.TestAllTypes.BAZ
   message.repeated_foreign_enum.append(unittest_pb2.FOREIGN_BAZ)
   if IsProto2(message):
     message.repeated_import_enum.append(unittest_import_pb2.IMPORT_BAZ)
@@ -707,8 +728,8 @@ class NonStandardInteger(numbers.Integral):
   NonStandardInteger is the minimal legal specification for a custom Integral.
   As such, it does not support 0 < x < 5 and it is not hashable.
 
-  Note: This is added here instead of relying on numpy or a similar library with
-  custom integers to limit dependencies.
+  Note: This is added here instead of relying on numpy or a similar library
+  with custom integers to limit dependencies.
   """
 
   def __init__(self, val, error_string_on_conversion=None):
@@ -845,4 +866,3 @@ class NonStandardInteger(numbers.Integral):
 
   def __repr__(self):
     return 'NonStandardInteger(%s)' % self.val
-
diff --git a/python/google/protobuf/internal/text_format_test.py b/python/google/protobuf/internal/text_format_test.py
index 176cbd15..237a2d50 100755
--- a/python/google/protobuf/internal/text_format_test.py
+++ b/python/google/protobuf/internal/text_format_test.py
@@ -1,4 +1,5 @@
 #! /usr/bin/env python
+# -*- coding: utf-8 -*-
 #
 # Protocol Buffers - Google's data interchange format
 # Copyright 2008 Google Inc.  All rights reserved.
@@ -35,6 +36,7 @@
 __author__ = 'kenton@google.com (Kenton Varda)'
 
 
+import math
 import re
 import six
 import string
@@ -46,6 +48,7 @@ except ImportError:
 
 from google.protobuf.internal import _parameterized
 
+from google.protobuf import any_pb2
 from google.protobuf import any_test_pb2
 from google.protobuf import map_unittest_pb2
 from google.protobuf import unittest_mset_pb2
@@ -53,8 +56,8 @@ from google.protobuf import unittest_pb2
 from google.protobuf import unittest_proto3_arena_pb2
 from google.protobuf.internal import api_implementation
 from google.protobuf.internal import any_test_pb2 as test_extend_any
-from google.protobuf.internal import test_util
 from google.protobuf.internal import message_set_extensions_pb2
+from google.protobuf.internal import test_util
 from google.protobuf import descriptor_pool
 from google.protobuf import text_format
 
@@ -97,7 +100,7 @@ class TextFormatBase(unittest.TestCase):
     return text
 
 
-@_parameterized.Parameters((unittest_pb2), (unittest_proto3_arena_pb2))
+@_parameterized.parameters((unittest_pb2), (unittest_proto3_arena_pb2))
 class TextFormatTest(TextFormatBase):
 
   def testPrintExotic(self, message_module):
@@ -297,6 +300,33 @@ class TextFormatTest(TextFormatBase):
     if message_module is unittest_pb2:
       test_util.ExpectAllFieldsSet(self, message)
 
+  def testParseAndMergeUtf8(self, message_module):
+    message = message_module.TestAllTypes()
+    test_util.SetAllFields(message)
+    ascii_text = text_format.MessageToString(message)
+    ascii_text = ascii_text.encode('utf-8')
+
+    parsed_message = message_module.TestAllTypes()
+    text_format.Parse(ascii_text, parsed_message)
+    self.assertEqual(message, parsed_message)
+    if message_module is unittest_pb2:
+      test_util.ExpectAllFieldsSet(self, message)
+
+    parsed_message.Clear()
+    text_format.Merge(ascii_text, parsed_message)
+    self.assertEqual(message, parsed_message)
+    if message_module is unittest_pb2:
+      test_util.ExpectAllFieldsSet(self, message)
+
+    if six.PY2:
+      msg2 = message_module.TestAllTypes()
+      text = (u'optional_string: "café"')
+      text_format.Merge(text, msg2)
+      self.assertEqual(msg2.optional_string, u'café')
+      msg2.Clear()
+      text_format.Parse(text, msg2)
+      self.assertEqual(msg2.optional_string, u'café')
+
   def testParseExotic(self, message_module):
     message = message_module.TestAllTypes()
     text = ('repeated_int64: -9223372036854775808\n'
@@ -340,6 +370,7 @@ class TextFormatTest(TextFormatBase):
   def testParseRepeatedScalarShortFormat(self, message_module):
     message = message_module.TestAllTypes()
     text = ('repeated_int64: [100, 200];\n'
+            'repeated_int64: []\n'
             'repeated_int64: 300,\n'
             'repeated_string: ["one", "two"];\n')
     text_format.Parse(text, message)
@@ -371,7 +402,10 @@ class TextFormatTest(TextFormatBase):
   def testParseInvalidUtf8(self, message_module):
     message = message_module.TestAllTypes()
     text = 'repeated_string: "\\xc3\\xc3"'
-    self.assertRaises(text_format.ParseError, text_format.Parse, text, message)
+    with self.assertRaises(text_format.ParseError) as e:
+      text_format.Parse(text, message)
+    self.assertEqual(e.exception.GetLine(), 1)
+    self.assertEqual(e.exception.GetColumn(), 28)
 
   def testParseSingleWord(self, message_module):
     message = message_module.TestAllTypes()
@@ -395,13 +429,6 @@ class TextFormatTest(TextFormatBase):
                            r'has no value named BARR.'), text_format.Parse,
                           text, message)
 
-    message = message_module.TestAllTypes()
-    text = 'optional_nested_enum: 100'
-    six.assertRaisesRegex(self, text_format.ParseError,
-                          (r'1:23 : Enum type "\w+.TestAllTypes.NestedEnum" '
-                           r'has no value with number 100.'), text_format.Parse,
-                          text, message)
-
   def testParseBadIntValue(self, message_module):
     message = message_module.TestAllTypes()
     text = 'optional_int32: bork'
@@ -452,16 +479,18 @@ class TextFormatTest(TextFormatBase):
     text_format.Parse(text_format.MessageToString(m), m2)
     self.assertEqual('oneof_uint32', m2.WhichOneof('oneof_field'))
 
+  def testMergeMultipleOneof(self, message_module):
+    m_string = '\n'.join(['oneof_uint32: 11', 'oneof_string: "foo"'])
+    m2 = message_module.TestAllTypes()
+    text_format.Merge(m_string, m2)
+    self.assertEqual('oneof_string', m2.WhichOneof('oneof_field'))
+
   def testParseMultipleOneof(self, message_module):
     m_string = '\n'.join(['oneof_uint32: 11', 'oneof_string: "foo"'])
     m2 = message_module.TestAllTypes()
-    if message_module is unittest_pb2:
-      with self.assertRaisesRegexp(text_format.ParseError,
-                                   ' is specified along with field '):
-        text_format.Parse(m_string, m2)
-    else:
+    with self.assertRaisesRegexp(text_format.ParseError,
+                                 ' is specified along with field '):
       text_format.Parse(m_string, m2)
-      self.assertEqual('oneof_string', m2.WhichOneof('oneof_field'))
 
 
 # These are tests that aren't fundamentally specific to proto2, but are at
@@ -497,20 +526,68 @@ class OnlyWorksWithProto2RightNowTests(TextFormatBase):
 
   def testPrintInIndexOrder(self):
     message = unittest_pb2.TestFieldOrderings()
-    message.my_string = '115'
+    # Fields are listed in index order instead of field number.
+    message.my_string = 'str'
     message.my_int = 101
     message.my_float = 111
     message.optional_nested_message.oo = 0
     message.optional_nested_message.bb = 1
+    message.Extensions[unittest_pb2.my_extension_string] = 'ext_str0'
+    # Extensions are listed based on the order of extension number.
+    # Extension number 12.
+    message.Extensions[unittest_pb2.TestExtensionOrderings2.
+                       test_ext_orderings2].my_string = 'ext_str2'
+    # Extension number 13.
+    message.Extensions[unittest_pb2.TestExtensionOrderings1.
+                       test_ext_orderings1].my_string = 'ext_str1'
+    # Extension number 14.
+    message.Extensions[
+        unittest_pb2.TestExtensionOrderings2.TestExtensionOrderings3.
+        test_ext_orderings3].my_string = 'ext_str3'
+
+    # Print in index order.
     self.CompareToGoldenText(
-        self.RemoveRedundantZeros(text_format.MessageToString(
-            message, use_index_order=True)),
-        'my_string: \"115\"\nmy_int: 101\nmy_float: 111\n'
-        'optional_nested_message {\n  oo: 0\n  bb: 1\n}\n')
+        self.RemoveRedundantZeros(
+            text_format.MessageToString(message, use_index_order=True)),
+        'my_string: "str"\n'
+        'my_int: 101\n'
+        'my_float: 111\n'
+        'optional_nested_message {\n'
+        '  oo: 0\n'
+        '  bb: 1\n'
+        '}\n'
+        '[protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] {\n'
+        '  my_string: "ext_str2"\n'
+        '}\n'
+        '[protobuf_unittest.TestExtensionOrderings1.test_ext_orderings1] {\n'
+        '  my_string: "ext_str1"\n'
+        '}\n'
+        '[protobuf_unittest.TestExtensionOrderings2.TestExtensionOrderings3'
+        '.test_ext_orderings3] {\n'
+        '  my_string: "ext_str3"\n'
+        '}\n'
+        '[protobuf_unittest.my_extension_string]: "ext_str0"\n')
+    # By default, print in field number order.
     self.CompareToGoldenText(
         self.RemoveRedundantZeros(text_format.MessageToString(message)),
-        'my_int: 101\nmy_string: \"115\"\nmy_float: 111\n'
-        'optional_nested_message {\n  bb: 1\n  oo: 0\n}\n')
+        'my_int: 101\n'
+        'my_string: "str"\n'
+        '[protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] {\n'
+        '  my_string: "ext_str2"\n'
+        '}\n'
+        '[protobuf_unittest.TestExtensionOrderings1.test_ext_orderings1] {\n'
+        '  my_string: "ext_str1"\n'
+        '}\n'
+        '[protobuf_unittest.TestExtensionOrderings2.TestExtensionOrderings3'
+        '.test_ext_orderings3] {\n'
+        '  my_string: "ext_str3"\n'
+        '}\n'
+        '[protobuf_unittest.my_extension_string]: "ext_str0"\n'
+        'my_float: 111\n'
+        'optional_nested_message {\n'
+        '  bb: 1\n'
+        '  oo: 0\n'
+        '}\n')
 
   def testMergeLinesGolden(self):
     opened = self.ReadGolden('text_format_unittest_data_oneof_implemented.txt')
@@ -782,13 +859,14 @@ class Proto2Tests(TextFormatBase):
             '    bin: "\xe0"'
             '    [nested_unknown_ext]: {\n'
             '      i: 23\n'
+            '      x: x\n'
             '      test: "test_string"\n'
             '      floaty_float: -0.315\n'
             '      num: -inf\n'
             '      multiline_str: "abc"\n'
             '          "def"\n'
             '          "xyz."\n'
-            '      [nested_unknown_ext]: <\n'
+            '      [nested_unknown_ext.ext]: <\n'
             '        i: 23\n'
             '        i: 24\n'
             '        pointfloat: .3\n'
@@ -800,6 +878,10 @@ class Proto2Tests(TextFormatBase):
             '    }\n'
             '  }\n'
             '  [unknown_extension]: 5\n'
+            '  [unknown_extension_with_number_field] {\n'
+            '    1: "some_field"\n'
+            '    2: -0.451\n'
+            '  }\n'
             '}\n')
     text_format.Parse(text, message, allow_unknown_extension=True)
     golden = 'message_set {\n}\n'
@@ -866,7 +948,6 @@ class Proto2Tests(TextFormatBase):
     message = unittest_mset_pb2.TestMessageSetContainer()
     malformed = ('message_set {\n'
                  '  unknown_field: true\n'
-                 '  \n'  # Missing '>' here.
                  '}\n')
     six.assertRaisesRegex(self,
                           text_format.ParseError,
@@ -878,7 +959,7 @@ class Proto2Tests(TextFormatBase):
                           message,
                           allow_unknown_extension=True)
 
-    # Parse known extension correcty.
+    # Parse known extension correctly.
     message = unittest_mset_pb2.TestMessageSetContainer()
     text = ('message_set {\n'
             '  [protobuf_unittest.TestMessageSetExtension1] {\n'
@@ -894,6 +975,14 @@ class Proto2Tests(TextFormatBase):
     self.assertEqual(23, message.message_set.Extensions[ext1].i)
     self.assertEqual('foo', message.message_set.Extensions[ext2].str)
 
+  def testParseBadIdentifier(self):
+    message = unittest_pb2.TestAllTypes()
+    text = ('optional_nested_message { "bb": 1 }')
+    with self.assertRaises(text_format.ParseError) as e:
+      text_format.Parse(text, message)
+    self.assertEqual(str(e.exception),
+                     '1:27 : Expected identifier or number, got "bb".')
+
   def testParseBadExtension(self):
     message = unittest_pb2.TestAllExtensions()
     text = '[unknown_extension]: 8\n'
@@ -905,6 +994,14 @@ class Proto2Tests(TextFormatBase):
         '1:2 : Message type "protobuf_unittest.TestAllTypes" does not have '
         'extensions.'), text_format.Parse, text, message)
 
+  def testParseNumericUnknownEnum(self):
+    message = unittest_pb2.TestAllTypes()
+    text = 'optional_nested_enum: 100'
+    six.assertRaisesRegex(self, text_format.ParseError,
+                          (r'1:23 : Enum type "\w+.TestAllTypes.NestedEnum" '
+                           r'has no value with number 100.'), text_format.Parse,
+                          text, message)
+
   def testMergeDuplicateExtensionScalars(self):
     message = unittest_pb2.TestAllExtensions()
     text = ('[protobuf_unittest.optional_int32_extension]: 42 '
@@ -923,15 +1020,26 @@ class Proto2Tests(TextFormatBase):
         '"protobuf_unittest.optional_int32_extension" extensions.'),
                           text_format.Parse, text, message)
 
-  def testParseDuplicateNestedMessageScalars(self):
+  def testParseDuplicateMessages(self):
     message = unittest_pb2.TestAllTypes()
     text = ('optional_nested_message { bb: 1 } '
             'optional_nested_message { bb: 2 }')
     six.assertRaisesRegex(self, text_format.ParseError, (
-        '1:65 : Message type "protobuf_unittest.TestAllTypes.NestedMessage" '
-        'should not have multiple "bb" fields.'), text_format.Parse, text,
+        '1:59 : Message type "protobuf_unittest.TestAllTypes" '
+        'should not have multiple "optional_nested_message" fields.'),
+                          text_format.Parse, text,
                           message)
 
+  def testParseDuplicateExtensionMessages(self):
+    message = unittest_pb2.TestAllExtensions()
+    text = ('[protobuf_unittest.optional_nested_message_extension]: {} '
+            '[protobuf_unittest.optional_nested_message_extension]: {}')
+    six.assertRaisesRegex(self, text_format.ParseError, (
+        '1:114 : Message type "protobuf_unittest.TestAllExtensions" '
+        'should not have multiple '
+        '"protobuf_unittest.optional_nested_message_extension" extensions.'),
+                          text_format.Parse, text, message)
+
   def testParseDuplicateScalars(self):
     message = unittest_pb2.TestAllTypes()
     text = ('optional_int32: 42 ' 'optional_int32: 67')
@@ -1018,6 +1126,14 @@ class Proto3Tests(unittest.TestCase):
         '  }\n'
         '}\n')
 
+  def testTopAnyMessage(self):
+    packed_msg = unittest_pb2.OneString()
+    msg = any_pb2.Any()
+    msg.Pack(packed_msg)
+    text = text_format.MessageToString(msg)
+    other_msg = text_format.Parse(text, any_pb2.Any())
+    self.assertEqual(msg, other_msg)
+
   def testPrintMessageExpandAnyRepeated(self):
     packed_message = unittest_pb2.OneString()
     message = any_test_pb2.TestAny()
@@ -1026,8 +1142,7 @@ class Proto3Tests(unittest.TestCase):
     packed_message.data = 'string1'
     message.repeated_any_value.add().Pack(packed_message)
     self.assertEqual(
-        text_format.MessageToString(message,
-                                    descriptor_pool=descriptor_pool.Default()),
+        text_format.MessageToString(message),
         'repeated_any_value {\n'
         '  [type.googleapis.com/protobuf_unittest.OneString] {\n'
         '    data: "string0"\n'
@@ -1039,18 +1154,6 @@ class Proto3Tests(unittest.TestCase):
         '  }\n'
         '}\n')
 
-  def testPrintMessageExpandAnyNoDescriptorPool(self):
-    packed_message = unittest_pb2.OneString()
-    packed_message.data = 'string'
-    message = any_test_pb2.TestAny()
-    message.any_value.Pack(packed_message)
-    self.assertEqual(
-        text_format.MessageToString(message, descriptor_pool=None),
-        'any_value {\n'
-        '  type_url: "type.googleapis.com/protobuf_unittest.OneString"\n'
-        '  value: "\\n\\006string"\n'
-        '}\n')
-
   def testPrintMessageExpandAnyDescriptorPoolMissingType(self):
     packed_message = unittest_pb2.OneString()
     packed_message.data = 'string'
@@ -1071,8 +1174,7 @@ class Proto3Tests(unittest.TestCase):
     message.any_value.Pack(packed_message)
     self.assertEqual(
         text_format.MessageToString(message,
-                                    pointy_brackets=True,
-                                    descriptor_pool=descriptor_pool.Default()),
+                                    pointy_brackets=True),
         'any_value <\n'
         '  [type.googleapis.com/protobuf_unittest.OneString] <\n'
         '    data: "string"\n'
@@ -1086,8 +1188,7 @@ class Proto3Tests(unittest.TestCase):
     message.any_value.Pack(packed_message)
     self.assertEqual(
         text_format.MessageToString(message,
-                                    as_one_line=True,
-                                    descriptor_pool=descriptor_pool.Default()),
+                                    as_one_line=True),
         'any_value {'
         ' [type.googleapis.com/protobuf_unittest.OneString]'
         ' { data: "string" } '
@@ -1108,6 +1209,14 @@ class Proto3Tests(unittest.TestCase):
         ' < data: "string" > '
         '>')
 
+  def testUnknownEnums(self):
+    message = unittest_proto3_arena_pb2.TestAllTypes()
+    message2 = unittest_proto3_arena_pb2.TestAllTypes()
+    message.optional_nested_enum = 999
+    text_string = text_format.MessageToString(message)
+    text_format.Parse(text_string, message2)
+    self.assertEqual(999, message2.optional_nested_enum)
+
   def testMergeExpandedAny(self):
     message = any_test_pb2.TestAny()
     text = ('any_value {\n'
@@ -1115,7 +1224,12 @@ class Proto3Tests(unittest.TestCase):
             '    data: "string"\n'
             '  }\n'
             '}\n')
-    text_format.Merge(text, message, descriptor_pool=descriptor_pool.Default())
+    text_format.Merge(text, message)
+    packed_message = unittest_pb2.OneString()
+    message.any_value.Unpack(packed_message)
+    self.assertEqual('string', packed_message.data)
+    message.Clear()
+    text_format.Parse(text, message)
     packed_message = unittest_pb2.OneString()
     message.any_value.Unpack(packed_message)
     self.assertEqual('string', packed_message.data)
@@ -1132,7 +1246,7 @@ class Proto3Tests(unittest.TestCase):
             '    data: "string1"\n'
             '  }\n'
             '}\n')
-    text_format.Merge(text, message, descriptor_pool=descriptor_pool.Default())
+    text_format.Merge(text, message)
     packed_message = unittest_pb2.OneString()
     message.repeated_any_value[0].Unpack(packed_message)
     self.assertEqual('string0', packed_message.data)
@@ -1146,22 +1260,22 @@ class Proto3Tests(unittest.TestCase):
             '    data: "string"\n'
             '  >\n'
             '}\n')
-    text_format.Merge(text, message, descriptor_pool=descriptor_pool.Default())
+    text_format.Merge(text, message)
     packed_message = unittest_pb2.OneString()
     message.any_value.Unpack(packed_message)
     self.assertEqual('string', packed_message.data)
 
-  def testMergeExpandedAnyNoDescriptorPool(self):
+  def testMergeAlternativeUrl(self):
     message = any_test_pb2.TestAny()
     text = ('any_value {\n'
-            '  [type.googleapis.com/protobuf_unittest.OneString] {\n'
+            '  [type.otherapi.com/protobuf_unittest.OneString] {\n'
             '    data: "string"\n'
             '  }\n'
             '}\n')
-    with self.assertRaises(text_format.ParseError) as e:
-      text_format.Merge(text, message, descriptor_pool=None)
-    self.assertEqual(str(e.exception),
-                     'Descriptor pool required to parse expanded Any field')
+    text_format.Merge(text, message)
+    packed_message = unittest_pb2.OneString()
+    self.assertEqual('type.otherapi.com/protobuf_unittest.OneString',
+                     message.any_value.type_url)
 
   def testMergeExpandedAnyDescriptorPoolMissingType(self):
     message = any_test_pb2.TestAny()
@@ -1188,6 +1302,15 @@ class Proto3Tests(unittest.TestCase):
     message.any_value.Unpack(packed_message)
     self.assertEqual('string', packed_message.data)
 
+  def testMergeMissingAnyEndToken(self):
+    message = any_test_pb2.TestAny()
+    text = ('any_value {\n'
+            '  [type.googleapis.com/protobuf_unittest.OneString] {\n'
+            '    data: "string"\n')
+    with self.assertRaises(text_format.ParseError) as e:
+      text_format.Merge(text, message)
+    self.assertEqual(str(e.exception), '3:11 : Expected "}".')
+
 
 class TokenizerTest(unittest.TestCase):
 
@@ -1199,7 +1322,7 @@ class TokenizerTest(unittest.TestCase):
             'ID9: 22 ID10: -111111111111111111 ID11: -22\n'
             'ID12: 2222222222222222222 ID13: 1.23456f ID14: 1.2e+2f '
             'false_bool:  0 true_BOOL:t \n true_bool1:  1 false_BOOL1:f '
-            'False_bool: False True_bool: True')
+            'False_bool: False True_bool: True X:iNf Y:-inF Z:nAN')
     tokenizer = text_format.Tokenizer(text.splitlines())
     methods = [(tokenizer.ConsumeIdentifier, 'identifier1'), ':',
                (tokenizer.ConsumeString, 'string1'),
@@ -1247,7 +1370,13 @@ class TokenizerTest(unittest.TestCase):
                (tokenizer.ConsumeIdentifier, 'False_bool'), ':',
                (tokenizer.ConsumeBool, False),
                (tokenizer.ConsumeIdentifier, 'True_bool'), ':',
-               (tokenizer.ConsumeBool, True)]
+               (tokenizer.ConsumeBool, True),
+               (tokenizer.ConsumeIdentifier, 'X'), ':',
+               (tokenizer.ConsumeFloat, float('inf')),
+               (tokenizer.ConsumeIdentifier, 'Y'), ':',
+               (tokenizer.ConsumeFloat, float('-inf')),
+               (tokenizer.ConsumeIdentifier, 'Z'), ':',
+               (tokenizer.ConsumeFloat, float('nan'))]
 
     i = 0
     while not tokenizer.AtEnd():
@@ -1256,6 +1385,8 @@ class TokenizerTest(unittest.TestCase):
         token = tokenizer.token
         self.assertEqual(token, m)
         tokenizer.NextToken()
+      elif isinstance(m[1], float) and math.isnan(m[1]):
+        self.assertTrue(math.isnan(m[0]()))
       else:
         self.assertEqual(m[1], m[0]())
       i += 1
@@ -1274,10 +1405,15 @@ class TokenizerTest(unittest.TestCase):
     self.assertEqual(int64_max + 1, tokenizer.ConsumeInteger())
     self.assertTrue(tokenizer.AtEnd())
 
-    text = '-0 0'
+    text = '-0 0 0 1.2'
     tokenizer = text_format.Tokenizer(text.splitlines())
     self.assertEqual(0, tokenizer.ConsumeInteger())
     self.assertEqual(0, tokenizer.ConsumeInteger())
+    self.assertEqual(True, tokenizer.TryConsumeInteger())
+    self.assertEqual(False, tokenizer.TryConsumeInteger())
+    with self.assertRaises(text_format.ParseError):
+      tokenizer.ConsumeInteger()
+    self.assertEqual(1.2, tokenizer.ConsumeFloat())
     self.assertTrue(tokenizer.AtEnd())
 
   def testConsumeIntegers(self):
@@ -1373,6 +1509,148 @@ class TokenizerTest(unittest.TestCase):
     self.assertEqual('# some comment', tokenizer.ConsumeComment())
     self.assertTrue(tokenizer.AtEnd())
 
+  def testConsumeLineComment(self):
+    tokenizer = text_format.Tokenizer('# some comment'.splitlines(),
+                                      skip_comments=False)
+    self.assertFalse(tokenizer.AtEnd())
+    self.assertEqual((False, '# some comment'),
+                     tokenizer.ConsumeCommentOrTrailingComment())
+    self.assertTrue(tokenizer.AtEnd())
+
+  def testConsumeTwoLineComments(self):
+    text = '# some comment\n# another comment'
+    tokenizer = text_format.Tokenizer(text.splitlines(), skip_comments=False)
+    self.assertEqual((False, '# some comment'),
+                     tokenizer.ConsumeCommentOrTrailingComment())
+    self.assertFalse(tokenizer.AtEnd())
+    self.assertEqual((False, '# another comment'),
+                     tokenizer.ConsumeCommentOrTrailingComment())
+    self.assertTrue(tokenizer.AtEnd())
+
+  def testConsumeAndCheckTrailingComment(self):
+    text = 'some_number: 4  # some comment'  # trailing comment on the same line
+    tokenizer = text_format.Tokenizer(text.splitlines(), skip_comments=False)
+    self.assertRaises(text_format.ParseError,
+                      tokenizer.ConsumeCommentOrTrailingComment)
+
+    self.assertEqual('some_number', tokenizer.ConsumeIdentifier())
+    self.assertEqual(tokenizer.token, ':')
+    tokenizer.NextToken()
+    self.assertRaises(text_format.ParseError,
+                      tokenizer.ConsumeCommentOrTrailingComment)
+    self.assertEqual(4, tokenizer.ConsumeInteger())
+    self.assertFalse(tokenizer.AtEnd())
+
+    self.assertEqual((True, '# some comment'),
+                     tokenizer.ConsumeCommentOrTrailingComment())
+    self.assertTrue(tokenizer.AtEnd())
+
+  def testHashinComment(self):
+    text = 'some_number: 4  # some comment # not a new comment'
+    tokenizer = text_format.Tokenizer(text.splitlines(), skip_comments=False)
+    self.assertEqual('some_number', tokenizer.ConsumeIdentifier())
+    self.assertEqual(tokenizer.token, ':')
+    tokenizer.NextToken()
+    self.assertEqual(4, tokenizer.ConsumeInteger())
+    self.assertEqual((True, '# some comment # not a new comment'),
+                     tokenizer.ConsumeCommentOrTrailingComment())
+    self.assertTrue(tokenizer.AtEnd())
+
+
+# Tests for pretty printer functionality.
+@_parameterized.parameters((unittest_pb2), (unittest_proto3_arena_pb2))
+class PrettyPrinterTest(TextFormatBase):
+
+  def testPrettyPrintNoMatch(self, message_module):
+
+    def printer(message, indent, as_one_line):
+      del message, indent, as_one_line
+      return None
+
+    message = message_module.TestAllTypes()
+    msg = message.repeated_nested_message.add()
+    msg.bb = 42
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=True, message_formatter=printer),
+        'repeated_nested_message { bb: 42 }')
+
+  def testPrettyPrintOneLine(self, message_module):
+
+    def printer(m, indent, as_one_line):
+      del indent, as_one_line
+      if m.DESCRIPTOR == message_module.TestAllTypes.NestedMessage.DESCRIPTOR:
+        return 'My lucky number is %s' % m.bb
+
+    message = message_module.TestAllTypes()
+    msg = message.repeated_nested_message.add()
+    msg.bb = 42
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=True, message_formatter=printer),
+        'repeated_nested_message { My lucky number is 42 }')
+
+  def testPrettyPrintMultiLine(self, message_module):
+
+    def printer(m, indent, as_one_line):
+      if m.DESCRIPTOR == message_module.TestAllTypes.NestedMessage.DESCRIPTOR:
+        line_deliminator = (' ' if as_one_line else '\n') + ' ' * indent
+        return 'My lucky number is:%s%s' % (line_deliminator, m.bb)
+      return None
+
+    message = message_module.TestAllTypes()
+    msg = message.repeated_nested_message.add()
+    msg.bb = 42
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=True, message_formatter=printer),
+        'repeated_nested_message { My lucky number is: 42 }')
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=False, message_formatter=printer),
+        'repeated_nested_message {\n  My lucky number is:\n  42\n}\n')
+
+  def testPrettyPrintEntireMessage(self, message_module):
+
+    def printer(m, indent, as_one_line):
+      del indent, as_one_line
+      if m.DESCRIPTOR == message_module.TestAllTypes.DESCRIPTOR:
+        return 'The is the message!'
+      return None
+
+    message = message_module.TestAllTypes()
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=False, message_formatter=printer),
+        'The is the message!\n')
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=True, message_formatter=printer),
+        'The is the message!')
+
+  def testPrettyPrintMultipleParts(self, message_module):
+
+    def printer(m, indent, as_one_line):
+      del indent, as_one_line
+      if m.DESCRIPTOR == message_module.TestAllTypes.NestedMessage.DESCRIPTOR:
+        return 'My lucky number is %s' % m.bb
+      return None
+
+    message = message_module.TestAllTypes()
+    message.optional_int32 = 61
+    msg = message.repeated_nested_message.add()
+    msg.bb = 42
+    msg = message.repeated_nested_message.add()
+    msg.bb = 99
+    msg = message.optional_nested_message
+    msg.bb = 1
+    self.CompareToGoldenText(
+        text_format.MessageToString(
+            message, as_one_line=True, message_formatter=printer),
+        ('optional_int32: 61 '
+         'optional_nested_message { My lucky number is 1 } '
+         'repeated_nested_message { My lucky number is 42 } '
+         'repeated_nested_message { My lucky number is 99 }'))
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/python/google/protobuf/internal/unknown_fields_test.py b/python/google/protobuf/internal/unknown_fields_test.py
index d614eaa8..8b7de2e7 100755
--- a/python/google/protobuf/internal/unknown_fields_test.py
+++ b/python/google/protobuf/internal/unknown_fields_test.py
@@ -54,10 +54,13 @@ from google.protobuf.internal import type_checkers
 BaseTestCase = testing_refleaks.BaseTestCase
 
 
-def SkipIfCppImplementation(func):
+# CheckUnknownField() cannot be used by the C++ implementation because
+# some protect members are called. It is not a behavior difference
+# for python and C++ implementation.
+def SkipCheckUnknownFieldIfCppImplementation(func):
   return unittest.skipIf(
       api_implementation.Type() == 'cpp' and api_implementation.Version() == 2,
-      'C++ implementation does not expose unknown fields to Python')(func)
+      'Addtional test for pure python involved protect members')(func)
 
 
 class UnknownFieldsTest(BaseTestCase):
@@ -77,11 +80,23 @@ class UnknownFieldsTest(BaseTestCase):
     # stdout.
     self.assertTrue(data == self.all_fields_data)
 
-  def testSerializeProto3(self):
-    # Verify that proto3 doesn't preserve unknown fields.
+  def expectSerializeProto3(self, preserve):
     message = unittest_proto3_arena_pb2.TestEmptyMessage()
     message.ParseFromString(self.all_fields_data)
-    self.assertEqual(0, len(message.SerializeToString()))
+    if preserve:
+      self.assertEqual(self.all_fields_data, message.SerializeToString())
+    else:
+      self.assertEqual(0, len(message.SerializeToString()))
+
+  def testSerializeProto3(self):
+    # Verify that proto3 unknown fields behavior.
+    default_preserve = (api_implementation
+                        .GetPythonProto3PreserveUnknownsDefault())
+    self.expectSerializeProto3(default_preserve)
+    api_implementation.SetPythonProto3PreserveUnknownsDefault(
+        not default_preserve)
+    self.expectSerializeProto3(not default_preserve)
+    api_implementation.SetPythonProto3PreserveUnknownsDefault(default_preserve)
 
   def testByteSize(self):
     self.assertEqual(self.all_fields.ByteSize(), self.empty_message.ByteSize())
@@ -154,12 +169,13 @@ class UnknownFieldsAccessorsTest(BaseTestCase):
     self.empty_message = unittest_pb2.TestEmptyMessage()
     self.empty_message.ParseFromString(self.all_fields_data)
 
-  # GetUnknownField() checks a detail of the Python implementation, which stores
-  # unknown fields as serialized strings. It cannot be used by the C++
-  # implementation: it's enough to check that the message is correctly
-  # serialized.
+  # CheckUnknownField() is an additional Pure Python check which checks
+  # a detail of unknown fields. It cannot be used by the C++
+  # implementation because some protect members are called.
+  # The test is added for historical reasons. It is not necessary as
+  # serialized string is checked.
 
-  def GetUnknownField(self, name):
+  def CheckUnknownField(self, name, expected_value):
     field_descriptor = self.descriptor.fields_by_name[name]
     wire_type = type_checkers.FIELD_TYPE_TO_WIRE_TYPE[field_descriptor.type]
     field_tag = encoder.TagBytes(field_descriptor.number, wire_type)
@@ -168,42 +184,35 @@ class UnknownFieldsAccessorsTest(BaseTestCase):
       if tag_bytes == field_tag:
         decoder = unittest_pb2.TestAllTypes._decoders_by_tag[tag_bytes][0]
         decoder(value, 0, len(value), self.all_fields, result_dict)
-    return result_dict[field_descriptor]
-
-  @SkipIfCppImplementation
-  def testEnum(self):
-    value = self.GetUnknownField('optional_nested_enum')
-    self.assertEqual(self.all_fields.optional_nested_enum, value)
-
-  @SkipIfCppImplementation
-  def testRepeatedEnum(self):
-    value = self.GetUnknownField('repeated_nested_enum')
-    self.assertEqual(self.all_fields.repeated_nested_enum, value)
-
-  @SkipIfCppImplementation
-  def testVarint(self):
-    value = self.GetUnknownField('optional_int32')
-    self.assertEqual(self.all_fields.optional_int32, value)
-
-  @SkipIfCppImplementation
-  def testFixed32(self):
-    value = self.GetUnknownField('optional_fixed32')
-    self.assertEqual(self.all_fields.optional_fixed32, value)
-
-  @SkipIfCppImplementation
-  def testFixed64(self):
-    value = self.GetUnknownField('optional_fixed64')
-    self.assertEqual(self.all_fields.optional_fixed64, value)
-
-  @SkipIfCppImplementation
-  def testLengthDelimited(self):
-    value = self.GetUnknownField('optional_string')
-    self.assertEqual(self.all_fields.optional_string, value)
-
-  @SkipIfCppImplementation
-  def testGroup(self):
-    value = self.GetUnknownField('optionalgroup')
-    self.assertEqual(self.all_fields.optionalgroup, value)
+    self.assertEqual(expected_value, result_dict[field_descriptor])
+
+  @SkipCheckUnknownFieldIfCppImplementation
+  def testCheckUnknownFieldValue(self):
+    # Test enum.
+    self.CheckUnknownField('optional_nested_enum',
+                           self.all_fields.optional_nested_enum)
+    # Test repeated enum.
+    self.CheckUnknownField('repeated_nested_enum',
+                           self.all_fields.repeated_nested_enum)
+
+    # Test varint.
+    self.CheckUnknownField('optional_int32',
+                           self.all_fields.optional_int32)
+    # Test fixed32.
+    self.CheckUnknownField('optional_fixed32',
+                           self.all_fields.optional_fixed32)
+
+    # Test fixed64.
+    self.CheckUnknownField('optional_fixed64',
+                           self.all_fields.optional_fixed64)
+
+    # Test lengthd elimited.
+    self.CheckUnknownField('optional_string',
+                           self.all_fields.optional_string)
+
+    # Test group.
+    self.CheckUnknownField('optionalgroup',
+                           self.all_fields.optionalgroup)
 
   def testCopyFrom(self):
     message = unittest_pb2.TestEmptyMessage()
@@ -263,12 +272,13 @@ class UnknownEnumValuesTest(BaseTestCase):
     self.missing_message = missing_enum_values_pb2.TestMissingEnumValues()
     self.missing_message.ParseFromString(self.message_data)
 
-  # GetUnknownField() checks a detail of the Python implementation, which stores
-  # unknown fields as serialized strings. It cannot be used by the C++
-  # implementation: it's enough to check that the message is correctly
-  # serialized.
+  # CheckUnknownField() is an additional Pure Python check which checks
+  # a detail of unknown fields. It cannot be used by the C++
+  # implementation because some protect members are called.
+  # The test is added for historical reasons. It is not necessary as
+  # serialized string is checked.
 
-  def GetUnknownField(self, name):
+  def CheckUnknownField(self, name, expected_value):
     field_descriptor = self.descriptor.fields_by_name[name]
     wire_type = type_checkers.FIELD_TYPE_TO_WIRE_TYPE[field_descriptor.type]
     field_tag = encoder.TagBytes(field_descriptor.number, wire_type)
@@ -278,7 +288,7 @@ class UnknownEnumValuesTest(BaseTestCase):
         decoder = missing_enum_values_pb2.TestEnumValues._decoders_by_tag[
             tag_bytes][0]
         decoder(value, 0, len(value), self.message, result_dict)
-    return result_dict[field_descriptor]
+    self.assertEqual(expected_value, result_dict[field_descriptor])
 
   def testUnknownParseMismatchEnumValue(self):
     just_string = missing_enum_values_pb2.JustString()
@@ -294,38 +304,27 @@ class UnknownEnumValuesTest(BaseTestCase):
     self.assertEqual(missing.optional_nested_enum, 0)
 
   def testUnknownEnumValue(self):
-    if api_implementation.Type() == 'cpp':
-      # The CPP implementation of protos (wrongly) allows unknown enum values
-      # for proto2.
-      self.assertTrue(self.missing_message.HasField('optional_nested_enum'))
-      self.assertEqual(self.message.optional_nested_enum,
-                       self.missing_message.optional_nested_enum)
-    else:
-      # On the other hand, the Python implementation considers unknown values
-      # as unknown fields. This is the correct behavior.
-      self.assertFalse(self.missing_message.HasField('optional_nested_enum'))
-      value = self.GetUnknownField('optional_nested_enum')
-      self.assertEqual(self.message.optional_nested_enum, value)
-    self.missing_message.ClearField('optional_nested_enum')
     self.assertFalse(self.missing_message.HasField('optional_nested_enum'))
+    self.assertEqual(self.missing_message.optional_nested_enum, 2)
+    # Clear does not do anything.
+    serialized = self.missing_message.SerializeToString()
+    self.missing_message.ClearField('optional_nested_enum')
+    self.assertEqual(self.missing_message.SerializeToString(), serialized)
 
   def testUnknownRepeatedEnumValue(self):
-    if api_implementation.Type() == 'cpp':
-      # For repeated enums, both implementations agree.
-      self.assertEqual([], self.missing_message.repeated_nested_enum)
-    else:
-      self.assertEqual([], self.missing_message.repeated_nested_enum)
-      value = self.GetUnknownField('repeated_nested_enum')
-      self.assertEqual(self.message.repeated_nested_enum, value)
+    self.assertEqual([], self.missing_message.repeated_nested_enum)
 
   def testUnknownPackedEnumValue(self):
-    if api_implementation.Type() == 'cpp':
-      # For repeated enums, both implementations agree.
-      self.assertEqual([], self.missing_message.packed_nested_enum)
-    else:
-      self.assertEqual([], self.missing_message.packed_nested_enum)
-      value = self.GetUnknownField('packed_nested_enum')
-      self.assertEqual(self.message.packed_nested_enum, value)
+    self.assertEqual([], self.missing_message.packed_nested_enum)
+
+  @SkipCheckUnknownFieldIfCppImplementation
+  def testCheckUnknownFieldValueForEnum(self):
+    self.CheckUnknownField('optional_nested_enum',
+                           self.message.optional_nested_enum)
+    self.CheckUnknownField('repeated_nested_enum',
+                           self.message.repeated_nested_enum)
+    self.CheckUnknownField('packed_nested_enum',
+                           self.message.packed_nested_enum)
 
   def testRoundTrip(self):
     new_message = missing_enum_values_pb2.TestEnumValues()
diff --git a/python/google/protobuf/internal/well_known_types.py b/python/google/protobuf/internal/well_known_types.py
index d631abee..37a65cfa 100644
--- a/python/google/protobuf/internal/well_known_types.py
+++ b/python/google/protobuf/internal/well_known_types.py
@@ -40,6 +40,7 @@ This files defines well known classes which need extra maintenance including:
 
 __author__ = 'jieluo@google.com (Jie Luo)'
 
+import collections
 from datetime import datetime
 from datetime import timedelta
 import six
@@ -67,13 +68,14 @@ class ParseError(Error):
 class Any(object):
   """Class for Any Message type."""
 
-  def Pack(self, msg, type_url_prefix='type.googleapis.com/'):
+  def Pack(self, msg, type_url_prefix='type.googleapis.com/',
+           deterministic=None):
     """Packs the specified message into current Any message."""
     if len(type_url_prefix) < 1 or type_url_prefix[-1] != '/':
       self.type_url = '%s/%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
     else:
       self.type_url = '%s%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
-    self.value = msg.SerializeToString()
+    self.value = msg.SerializeToString(deterministic=deterministic)
 
   def Unpack(self, msg):
     """Unpacks the current Any message into specified message."""
@@ -350,12 +352,12 @@ class Duration(object):
             self.nanos, _NANOS_PER_MICROSECOND))
 
   def FromTimedelta(self, td):
-    """Convertd timedelta to Duration."""
+    """Converts timedelta to Duration."""
     self._NormalizeDuration(td.seconds + td.days * _SECONDS_PER_DAY,
                             td.microseconds * _NANOS_PER_MICROSECOND)
 
   def _NormalizeDuration(self, seconds, nanos):
-    """Set Duration by seconds and nonas."""
+    """Set Duration by seconds and nanos."""
     # Force nanos to be negative if the duration is negative.
     if seconds < 0 and nanos > 0:
       seconds += 1
@@ -373,6 +375,9 @@ def _CheckDurationValid(seconds, nanos):
     raise Error(
         'Duration is not valid: Nanos {0} must be in range '
         '[-999999999, 999999999].'.format(nanos))
+  if (nanos < 0 and seconds > 0) or (nanos > 0 and seconds < 0):
+    raise Error(
+        'Duration is not valid: Sign mismatch.')
 
 
 def _RoundTowardZero(value, divider):
@@ -473,7 +478,7 @@ def _IsValidPath(message_descriptor, path):
   parts = path.split('.')
   last = parts.pop()
   for name in parts:
-    field = message_descriptor.fields_by_name[name]
+    field = message_descriptor.fields_by_name.get(name)
     if (field is None or
         field.label == FieldDescriptor.LABEL_REPEATED or
         field.type != FieldDescriptor.TYPE_MESSAGE):
@@ -647,9 +652,10 @@ def _MergeMessage(
         raise ValueError('Error: Field {0} in message {1} is not a singular '
                          'message field and cannot have sub-fields.'.format(
                              name, source_descriptor.full_name))
-      _MergeMessage(
-          child, getattr(source, name), getattr(destination, name),
-          replace_message, replace_repeated)
+      if source.HasField(name):
+        _MergeMessage(
+            child, getattr(source, name), getattr(destination, name),
+            replace_message, replace_repeated)
       continue
     if field.label == FieldDescriptor.LABEL_REPEATED:
       if replace_repeated:
@@ -698,6 +704,12 @@ def _SetStructValue(struct_value, value):
     struct_value.string_value = value
   elif isinstance(value, _INT_OR_FLOAT):
     struct_value.number_value = value
+  elif isinstance(value, dict):
+    struct_value.struct_value.Clear()
+    struct_value.struct_value.update(value)
+  elif isinstance(value, list):
+    struct_value.list_value.Clear()
+    struct_value.list_value.extend(value)
   else:
     raise ValueError('Unexpected type')
 
@@ -728,18 +740,49 @@ class Struct(object):
   def __getitem__(self, key):
     return _GetStructValue(self.fields[key])
 
+  def __contains__(self, item):
+    return item in self.fields
+
   def __setitem__(self, key, value):
     _SetStructValue(self.fields[key], value)
 
+  def __delitem__(self, key):
+    del self.fields[key]
+
+  def __len__(self):
+    return len(self.fields)
+
+  def __iter__(self):
+    return iter(self.fields)
+
+  def keys(self):  # pylint: disable=invalid-name
+    return self.fields.keys()
+
+  def values(self):  # pylint: disable=invalid-name
+    return [self[key] for key in self]
+
+  def items(self):  # pylint: disable=invalid-name
+    return [(key, self[key]) for key in self]
+
   def get_or_create_list(self, key):
     """Returns a list for this key, creating if it didn't exist already."""
+    if not self.fields[key].HasField('list_value'):
+      # Clear will mark list_value modified which will indeed create a list.
+      self.fields[key].list_value.Clear()
     return self.fields[key].list_value
 
   def get_or_create_struct(self, key):
     """Returns a struct for this key, creating if it didn't exist already."""
+    if not self.fields[key].HasField('struct_value'):
+      # Clear will mark struct_value modified which will indeed create a struct.
+      self.fields[key].struct_value.Clear()
     return self.fields[key].struct_value
 
-  # TODO(haberman): allow constructing/merging from dict.
+  def update(self, dictionary):  # pylint: disable=invalid-name
+    for key, value in dictionary.items():
+      _SetStructValue(self.fields[key], value)
+
+collections.MutableMapping.register(Struct)
 
 
 class ListValue(object):
@@ -762,17 +805,28 @@ class ListValue(object):
   def __setitem__(self, index, value):
     _SetStructValue(self.values.__getitem__(index), value)
 
+  def __delitem__(self, key):
+    del self.values[key]
+
   def items(self):
     for i in range(len(self)):
       yield self[i]
 
   def add_struct(self):
     """Appends and returns a struct value as the next value in the list."""
-    return self.values.add().struct_value
+    struct_value = self.values.add().struct_value
+    # Clear will mark struct_value modified which will indeed create a struct.
+    struct_value.Clear()
+    return struct_value
 
   def add_list(self):
     """Appends and returns a list value as the next value in the list."""
-    return self.values.add().list_value
+    list_value = self.values.add().list_value
+    # Clear will mark list_value modified which will indeed create a list.
+    list_value.Clear()
+    return list_value
+
+collections.MutableSequence.register(ListValue)
 
 
 WKTBASES = {
diff --git a/python/google/protobuf/internal/well_known_types_test.py b/python/google/protobuf/internal/well_known_types_test.py
index 077f630f..965940b2 100644
--- a/python/google/protobuf/internal/well_known_types_test.py
+++ b/python/google/protobuf/internal/well_known_types_test.py
@@ -34,6 +34,7 @@
 
 __author__ = 'jieluo@google.com (Jie Luo)'
 
+import collections
 from datetime import datetime
 
 try:
@@ -100,11 +101,15 @@ class TimeUtilTest(TimeUtilTestBase):
     message.FromJsonString('1970-01-01T00:00:00.1Z')
     self.assertEqual(0, message.seconds)
     self.assertEqual(100000000, message.nanos)
-    # Parsing accpets offsets.
+    # Parsing accepts offsets.
     message.FromJsonString('1970-01-01T00:00:00-08:00')
     self.assertEqual(8 * 3600, message.seconds)
     self.assertEqual(0, message.nanos)
 
+    # It is not easy to check with current time. For test coverage only.
+    message.GetCurrentTime()
+    self.assertNotEqual(8 * 3600, message.seconds)
+
   def testDurationSerializeAndParse(self):
     message = duration_pb2.Duration()
     # Generated output should contain 3, 6, or 9 fractional digits.
@@ -268,6 +273,17 @@ class TimeUtilTest(TimeUtilTestBase):
   def testInvalidTimestamp(self):
     message = timestamp_pb2.Timestamp()
     self.assertRaisesRegexp(
+        well_known_types.ParseError,
+        'Failed to parse timestamp: missing valid timezone offset.',
+        message.FromJsonString,
+        '')
+    self.assertRaisesRegexp(
+        well_known_types.ParseError,
+        'Failed to parse timestamp: invalid trailing data '
+        '1970-01-01T00:00:01Ztrail.',
+        message.FromJsonString,
+        '1970-01-01T00:00:01Ztrail')
+    self.assertRaisesRegexp(
         ValueError,
         'time data \'10000-01-01T00:00:00\' does not match'
         ' format \'%Y-%m-%dT%H:%M:%S\'',
@@ -284,7 +300,7 @@ class TimeUtilTest(TimeUtilTestBase):
         '1972-01-01T01:00:00.01+08',)
     self.assertRaisesRegexp(
         ValueError,
-        'year is out of range',
+        'year (0 )?is out of range',
         message.FromJsonString,
         '0000-01-01T00:00:00Z')
     message.seconds = 253402300800
@@ -322,6 +338,19 @@ class TimeUtilTest(TimeUtilTestBase):
         r'Duration is not valid\: Seconds -315576000001 must be in range'
         r' \[-315576000000\, 315576000000\].',
         message.ToJsonString)
+    message.seconds = 0
+    message.nanos = 999999999 + 1
+    self.assertRaisesRegexp(
+        well_known_types.Error,
+        r'Duration is not valid\: Nanos 1000000000 must be in range'
+        r' \[-999999999\, 999999999\].',
+        message.ToJsonString)
+    message.seconds = -1
+    message.nanos = 1
+    self.assertRaisesRegexp(
+        well_known_types.Error,
+        r'Duration is not valid\: Sign mismatch.',
+        message.ToJsonString)
 
 
 class FieldMaskTest(unittest.TestCase):
@@ -363,10 +392,37 @@ class FieldMaskTest(unittest.TestCase):
     self.assertTrue(mask.IsValidForDescriptor(msg_descriptor))
     for field in msg_descriptor.fields:
       self.assertTrue(field.name in mask.paths)
+
+  def testIsValidForDescriptor(self):
+    msg_descriptor = unittest_pb2.TestAllTypes.DESCRIPTOR
+    # Empty mask
+    mask = field_mask_pb2.FieldMask()
+    self.assertTrue(mask.IsValidForDescriptor(msg_descriptor))
+    # All fields from descriptor
+    mask.AllFieldsFromDescriptor(msg_descriptor)
+    self.assertTrue(mask.IsValidForDescriptor(msg_descriptor))
+    # Child under optional message
     mask.paths.append('optional_nested_message.bb')
     self.assertTrue(mask.IsValidForDescriptor(msg_descriptor))
+    # Repeated field is only allowed in the last position of path
     mask.paths.append('repeated_nested_message.bb')
     self.assertFalse(mask.IsValidForDescriptor(msg_descriptor))
+    # Invalid top level field
+    mask = field_mask_pb2.FieldMask()
+    mask.paths.append('xxx')
+    self.assertFalse(mask.IsValidForDescriptor(msg_descriptor))
+    # Invalid field in root
+    mask = field_mask_pb2.FieldMask()
+    mask.paths.append('xxx.zzz')
+    self.assertFalse(mask.IsValidForDescriptor(msg_descriptor))
+    # Invalid field in internal node
+    mask = field_mask_pb2.FieldMask()
+    mask.paths.append('optional_nested_message.xxx.zzz')
+    self.assertFalse(mask.IsValidForDescriptor(msg_descriptor))
+    # Invalid field in leaf
+    mask = field_mask_pb2.FieldMask()
+    mask.paths.append('optional_nested_message.xxx')
+    self.assertFalse(mask.IsValidForDescriptor(msg_descriptor))
 
   def testCanonicalFrom(self):
     mask = field_mask_pb2.FieldMask()
@@ -422,6 +478,9 @@ class FieldMaskTest(unittest.TestCase):
     mask2.FromJsonString('foo.bar,bar')
     out_mask.Union(mask1, mask2)
     self.assertEqual('bar,foo.bar,quz', out_mask.ToJsonString())
+    src = unittest_pb2.TestAllTypes()
+    with self.assertRaises(ValueError):
+      out_mask.Union(src, mask2)
 
   def testIntersect(self):
     mask1 = field_mask_pb2.FieldMask()
@@ -546,6 +605,29 @@ class FieldMaskTest(unittest.TestCase):
     self.assertEqual(1, len(nested_dst.payload.repeated_int32))
     self.assertEqual(1234, nested_dst.payload.repeated_int32[0])
 
+    # Test Merge oneof field.
+    new_msg = unittest_pb2.TestOneof2()
+    dst = unittest_pb2.TestOneof2()
+    dst.foo_message.qux_int = 1
+    mask = field_mask_pb2.FieldMask()
+    mask.FromJsonString('fooMessage,fooLazyMessage.quxInt')
+    mask.MergeMessage(new_msg, dst)
+    self.assertTrue(dst.HasField('foo_message'))
+    self.assertFalse(dst.HasField('foo_lazy_message'))
+
+  def testMergeErrors(self):
+    src = unittest_pb2.TestAllTypes()
+    dst = unittest_pb2.TestAllTypes()
+    mask = field_mask_pb2.FieldMask()
+    test_util.SetAllFields(src)
+    mask.FromJsonString('optionalInt32.field')
+    with self.assertRaises(ValueError) as e:
+      mask.MergeMessage(src, dst)
+    self.assertEqual('Error: Field optional_int32 in message '
+                     'protobuf_unittest.TestAllTypes is not a singular '
+                     'message field and cannot have sub-fields.',
+                     str(e.exception))
+
   def testSnakeCaseToCamelCase(self):
     self.assertEqual('fooBar',
                      well_known_types._SnakeCaseToCamelCase('foo_bar'))
@@ -602,6 +684,8 @@ class StructTest(unittest.TestCase):
 
   def testStruct(self):
     struct = struct_pb2.Struct()
+    self.assertIsInstance(struct, collections.Mapping)
+    self.assertEqual(0, len(struct))
     struct_class = struct.__class__
 
     struct['key1'] = 5
@@ -609,9 +693,13 @@ class StructTest(unittest.TestCase):
     struct['key3'] = True
     struct.get_or_create_struct('key4')['subkey'] = 11.0
     struct_list = struct.get_or_create_list('key5')
+    self.assertIsInstance(struct_list, collections.Sequence)
     struct_list.extend([6, 'seven', True, False, None])
     struct_list.add_struct()['subkey2'] = 9
+    struct['key6'] = {'subkey': {}}
+    struct['key7'] = [2, False]
 
+    self.assertEqual(7, len(struct))
     self.assertTrue(isinstance(struct, well_known_types.Struct))
     self.assertEqual(5, struct['key1'])
     self.assertEqual('abc', struct['key2'])
@@ -621,13 +709,28 @@ class StructTest(unittest.TestCase):
     inner_struct['subkey2'] = 9
     self.assertEqual([6, 'seven', True, False, None, inner_struct],
                      list(struct['key5'].items()))
+    self.assertEqual({}, dict(struct['key6']['subkey'].fields))
+    self.assertEqual([2, False], list(struct['key7'].items()))
 
     serialized = struct.SerializeToString()
-
     struct2 = struct_pb2.Struct()
     struct2.ParseFromString(serialized)
 
     self.assertEqual(struct, struct2)
+    for key, value in struct.items():
+      self.assertIn(key, struct)
+      self.assertIn(key, struct2)
+      self.assertEqual(value, struct2[key])
+
+    self.assertEqual(7, len(struct.keys()))
+    self.assertEqual(7, len(struct.values()))
+    for key in struct.keys():
+      self.assertIn(key, struct)
+      self.assertIn(key, struct2)
+      self.assertEqual(struct[key], struct2[key])
+
+    item = (next(iter(struct.keys())), next(iter(struct.values())))
+    self.assertEqual(item, next(iter(struct.items())))
 
     self.assertTrue(isinstance(struct2, well_known_types.Struct))
     self.assertEqual(5, struct2['key1'])
@@ -651,6 +754,17 @@ class StructTest(unittest.TestCase):
     struct_list.add_list().extend([1, 'two', True, False, None])
     self.assertEqual([1, 'two', True, False, None],
                      list(struct_list[6].items()))
+    struct_list.extend([{'nested_struct': 30}, ['nested_list', 99], {}, []])
+    self.assertEqual(11, len(struct_list.values))
+    self.assertEqual(30, struct_list[7]['nested_struct'])
+    self.assertEqual('nested_list', struct_list[8][0])
+    self.assertEqual(99, struct_list[8][1])
+    self.assertEqual({}, dict(struct_list[9].fields))
+    self.assertEqual([], list(struct_list[10].items()))
+    struct_list[0] = {'replace': 'set'}
+    struct_list[1] = ['replace', 'set']
+    self.assertEqual('set', struct_list[0]['replace'])
+    self.assertEqual(['replace', 'set'], list(struct_list[1].items()))
 
     text_serialized = str(struct)
     struct3 = struct_pb2.Struct()
@@ -660,6 +774,77 @@ class StructTest(unittest.TestCase):
     struct.get_or_create_struct('key3')['replace'] = 12
     self.assertEqual(12, struct['key3']['replace'])
 
+    # Tests empty list.
+    struct.get_or_create_list('empty_list')
+    empty_list = struct['empty_list']
+    self.assertEqual([], list(empty_list.items()))
+    list2 = struct_pb2.ListValue()
+    list2.add_list()
+    empty_list = list2[0]
+    self.assertEqual([], list(empty_list.items()))
+
+    # Tests empty struct.
+    struct.get_or_create_struct('empty_struct')
+    empty_struct = struct['empty_struct']
+    self.assertEqual({}, dict(empty_struct.fields))
+    list2.add_struct()
+    empty_struct = list2[1]
+    self.assertEqual({}, dict(empty_struct.fields))
+
+    self.assertEqual(9, len(struct))
+    del struct['key3']
+    del struct['key4']
+    self.assertEqual(7, len(struct))
+    self.assertEqual(6, len(struct['key5']))
+    del struct['key5'][1]
+    self.assertEqual(5, len(struct['key5']))
+    self.assertEqual([6, True, False, None, inner_struct],
+                     list(struct['key5'].items()))
+
+  def testMergeFrom(self):
+    struct = struct_pb2.Struct()
+    struct_class = struct.__class__
+
+    dictionary = {
+        'key1': 5,
+        'key2': 'abc',
+        'key3': True,
+        'key4': {'subkey': 11.0},
+        'key5': [6, 'seven', True, False, None, {'subkey2': 9}],
+        'key6': [['nested_list', True]],
+        'empty_struct': {},
+        'empty_list': []
+    }
+    struct.update(dictionary)
+    self.assertEqual(5, struct['key1'])
+    self.assertEqual('abc', struct['key2'])
+    self.assertIs(True, struct['key3'])
+    self.assertEqual(11, struct['key4']['subkey'])
+    inner_struct = struct_class()
+    inner_struct['subkey2'] = 9
+    self.assertEqual([6, 'seven', True, False, None, inner_struct],
+                     list(struct['key5'].items()))
+    self.assertEqual(2, len(struct['key6'][0].values))
+    self.assertEqual('nested_list', struct['key6'][0][0])
+    self.assertEqual(True, struct['key6'][0][1])
+    empty_list = struct['empty_list']
+    self.assertEqual([], list(empty_list.items()))
+    empty_struct = struct['empty_struct']
+    self.assertEqual({}, dict(empty_struct.fields))
+
+    # According to documentation: "When parsing from the wire or when merging,
+    # if there are duplicate map keys the last key seen is used".
+    duplicate = {
+        'key4': {'replace': 20},
+        'key5': [[False, 5]]
+    }
+    struct.update(duplicate)
+    self.assertEqual(1, len(struct['key4'].fields))
+    self.assertEqual(20, struct['key4']['replace'])
+    self.assertEqual(1, len(struct['key5'].values))
+    self.assertEqual(False, struct['key5'][0][0])
+    self.assertEqual(5, struct['key5'][0][1])
+
 
 class AnyTest(unittest.TestCase):
 
@@ -723,6 +908,20 @@ class AnyTest(unittest.TestCase):
     self.assertTrue(msg.Unpack(unpacked_message))
     self.assertEqual(submessage, unpacked_message)
 
+  def testPackDeterministic(self):
+    submessage = any_test_pb2.TestAny()
+    for i in range(10):
+      submessage.map_value[str(i)] = i * 2
+    msg = any_pb2.Any()
+    msg.Pack(submessage, deterministic=True)
+    serialized = msg.SerializeToString(deterministic=True)
+    golden = (b'\n4type.googleapis.com/google.protobuf.internal.TestAny\x12F'
+              b'\x1a\x05\n\x010\x10\x00\x1a\x05\n\x011\x10\x02\x1a\x05\n\x01'
+              b'2\x10\x04\x1a\x05\n\x013\x10\x06\x1a\x05\n\x014\x10\x08\x1a'
+              b'\x05\n\x015\x10\n\x1a\x05\n\x016\x10\x0c\x1a\x05\n\x017\x10'
+              b'\x0e\x1a\x05\n\x018\x10\x10\x1a\x05\n\x019\x10\x12')
+    self.assertEqual(golden, serialized)
+
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/python/google/protobuf/json_format.py b/python/google/protobuf/json_format.py
index d02cb091..8d338d3e 100644
--- a/python/google/protobuf/json_format.py
+++ b/python/google/protobuf/json_format.py
@@ -42,21 +42,28 @@ Simple usage example:
 
 __author__ = 'jieluo@google.com (Jie Luo)'
 
+# pylint: disable=g-statement-before-imports,g-import-not-at-top
 try:
   from collections import OrderedDict
 except ImportError:
-  from ordereddict import OrderedDict  #PY26
+  from ordereddict import OrderedDict  # PY26
+# pylint: enable=g-statement-before-imports,g-import-not-at-top
+
 import base64
 import json
 import math
+
+from operator import methodcaller
+
 import re
-import six
 import sys
 
-from operator import methodcaller
+import six
+
 from google.protobuf import descriptor
 from google.protobuf import symbol_database
 
+
 _TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
 _INT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT32,
                         descriptor.FieldDescriptor.CPPTYPE_UINT32,
@@ -74,6 +81,9 @@ _UNPAIRED_SURROGATE_PATTERN = re.compile(six.u(
     r'[\ud800-\udbff](?![\udc00-\udfff])|(?<![\ud800-\udbff])[\udc00-\udfff]'
 ))
 
+_VALID_EXTENSION_NAME = re.compile(r'\[[a-zA-Z0-9\._]*\]$')
+
+
 class Error(Exception):
   """Top-level module error for json_format."""
 
@@ -88,7 +98,10 @@ class ParseError(Error):
 
 def MessageToJson(message,
                   including_default_value_fields=False,
-                  preserving_proto_field_name=False):
+                  preserving_proto_field_name=False,
+                  indent=2,
+                  sort_keys=False,
+                  use_integers_for_enums=False):
   """Converts protobuf message to JSON format.
 
   Args:
@@ -100,19 +113,27 @@ def MessageToJson(message,
     preserving_proto_field_name: If True, use the original proto field
         names as defined in the .proto file. If False, convert the field
         names to lowerCamelCase.
+    indent: The JSON object will be pretty-printed with this indent level.
+        An indent level of 0 or negative will only insert newlines.
+    sort_keys: If True, then the output will be sorted by field names.
+    use_integers_for_enums: If true, print integers instead of enum names.
 
   Returns:
     A string containing the JSON formatted protocol buffer message.
   """
   printer = _Printer(including_default_value_fields,
-                     preserving_proto_field_name)
-  return printer.ToJsonString(message)
+                     preserving_proto_field_name,
+                     use_integers_for_enums)
+  return printer.ToJsonString(message, indent, sort_keys)
 
 
 def MessageToDict(message,
                   including_default_value_fields=False,
-                  preserving_proto_field_name=False):
-  """Converts protobuf message to a JSON dictionary.
+                  preserving_proto_field_name=False,
+                  use_integers_for_enums=False):
+  """Converts protobuf message to a dictionary.
+
+  When the dictionary is encoded to JSON, it conforms to proto3 JSON spec.
 
   Args:
     message: The protocol buffers message instance to serialize.
@@ -123,12 +144,14 @@ def MessageToDict(message,
     preserving_proto_field_name: If True, use the original proto field
         names as defined in the .proto file. If False, convert the field
         names to lowerCamelCase.
+    use_integers_for_enums: If true, print integers instead of enum names.
 
   Returns:
-    A dict representation of the JSON formatted protocol buffer message.
+    A dict representation of the protocol buffer message.
   """
   printer = _Printer(including_default_value_fields,
-                     preserving_proto_field_name)
+                     preserving_proto_field_name,
+                     use_integers_for_enums)
   # pylint: disable=protected-access
   return printer._MessageToJsonObject(message)
 
@@ -144,13 +167,15 @@ class _Printer(object):
 
   def __init__(self,
                including_default_value_fields=False,
-               preserving_proto_field_name=False):
+               preserving_proto_field_name=False,
+               use_integers_for_enums=False):
     self.including_default_value_fields = including_default_value_fields
     self.preserving_proto_field_name = preserving_proto_field_name
+    self.use_integers_for_enums = use_integers_for_enums
 
-  def ToJsonString(self, message):
+  def ToJsonString(self, message, indent, sort_keys):
     js = self._MessageToJsonObject(message)
-    return json.dumps(js, indent=2)
+    return json.dumps(js, indent=indent, sort_keys=sort_keys)
 
   def _MessageToJsonObject(self, message):
     """Converts message to an object according to Proto3 JSON Specification."""
@@ -192,6 +217,14 @@ class _Printer(object):
           # Convert a repeated field.
           js[name] = [self._FieldToJsonObject(field, k)
                       for k in value]
+        elif field.is_extension:
+          f = field
+          if (f.containing_type.GetOptions().message_set_wire_format and
+              f.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
+              f.label == descriptor.FieldDescriptor.LABEL_OPTIONAL):
+            f = f.message_type
+          name = '[%s.%s]' % (f.full_name, name)
+          js[name] = self._FieldToJsonObject(field, value)
         else:
           js[name] = self._FieldToJsonObject(field, value)
 
@@ -229,10 +262,14 @@ class _Printer(object):
     if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
       return self._MessageToJsonObject(value)
     elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
+      if self.use_integers_for_enums:
+        return value
       enum_value = field.enum_type.values_by_number.get(value, None)
       if enum_value is not None:
         return enum_value.name
       else:
+        if field.file.syntax == 'proto3':
+          return value
         raise SerializeToJsonError('Enum field contains an integer value '
                                    'which can not mapped to an enum value.')
     elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
@@ -433,12 +470,23 @@ class _Parser(object):
         field = fields_by_json_name.get(name, None)
         if not field:
           field = message_descriptor.fields_by_name.get(name, None)
+        if not field and _VALID_EXTENSION_NAME.match(name):
+          if not message_descriptor.is_extendable:
+            raise ParseError('Message type {0} does not have extensions'.format(
+                message_descriptor.full_name))
+          identifier = name[1:-1]  # strip [] brackets
+          identifier = '.'.join(identifier.split('.')[:-1])
+          # pylint: disable=protected-access
+          field = message.Extensions._FindExtensionByName(identifier)
+          # pylint: enable=protected-access
         if not field:
           if self.ignore_unknown_fields:
             continue
           raise ParseError(
-              'Message type "{0}" has no field named "{1}".'.format(
-                  message_descriptor.full_name, name))
+              ('Message type "{0}" has no field named "{1}".\n'
+               ' Available Fields(except extensions): {2}').format(
+                   message_descriptor.full_name, name,
+                   message_descriptor.fields))
         if name in names:
           raise ParseError('Message type "{0}" should not have multiple '
                            '"{1}" fields.'.format(
@@ -491,7 +539,10 @@ class _Parser(object):
               getattr(message, field.name).append(
                   _ConvertScalarFieldValue(item, field))
         elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
-          sub_message = getattr(message, field.name)
+          if field.is_extension:
+            sub_message = message.Extensions[field]
+          else:
+            sub_message = getattr(message, field.name)
           sub_message.SetInParent()
           self.ConvertMessage(value, sub_message)
         else:
@@ -532,8 +583,8 @@ class _Parser(object):
 
   def _ConvertGenericMessage(self, value, message):
     """Convert a JSON representation into message with FromJsonString."""
-    # Durantion, Timestamp, FieldMask have FromJsonString method to do the
-    # convert. Users can also call the method directly.
+    # Duration, Timestamp, FieldMask have a FromJsonString method to do the
+    # conversion. Users can also call the method directly.
     message.FromJsonString(value)
 
   def _ConvertValueMessage(self, value, message):
@@ -643,6 +694,9 @@ def _ConvertScalarFieldValue(value, field, require_str=False):
         raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
             value, field.enum_type.full_name))
       if enum_value is None:
+        if field.file.syntax == 'proto3':
+          # Proto3 accepts unknown enums.
+          return number
         raise ParseError('Invalid enum value {0} for enum type {1}.'.format(
             value, field.enum_type.full_name))
     return enum_value.number
diff --git a/python/google/protobuf/message.py b/python/google/protobuf/message.py
index aab250e4..eeb0d576 100755
--- a/python/google/protobuf/message.py
+++ b/python/google/protobuf/message.py
@@ -184,9 +184,15 @@ class Message(object):
     self.Clear()
     self.MergeFromString(serialized)
 
-  def SerializeToString(self):
+  def SerializeToString(self, **kwargs):
     """Serializes the protocol message to a binary string.
 
+    Arguments:
+      **kwargs: Keyword arguments to the serialize method, accepts
+        the following keyword args:
+        deterministic: If true, requests deterministic serialization of the
+          protobuf, with predictable ordering of map keys.
+
     Returns:
       A binary string representation of the message if all of the required
       fields in the message are set (i.e. the message is initialized).
@@ -196,12 +202,18 @@ class Message(object):
     """
     raise NotImplementedError
 
-  def SerializePartialToString(self):
+  def SerializePartialToString(self, **kwargs):
     """Serializes the protocol message to a binary string.
 
     This method is similar to SerializeToString but doesn't check if the
     message is initialized.
 
+    Arguments:
+      **kwargs: Keyword arguments to the serialize method, accepts
+        the following keyword args:
+        deterministic: If true, requests deterministic serialization of the
+          protobuf, with predictable ordering of map keys.
+
     Returns:
       A string representation of the partial message.
     """
diff --git a/python/google/protobuf/message_factory.py b/python/google/protobuf/message_factory.py
index 8ab1c513..e4fb065e 100644
--- a/python/google/protobuf/message_factory.py
+++ b/python/google/protobuf/message_factory.py
@@ -66,7 +66,7 @@ class MessageFactory(object):
     Returns:
       A class describing the passed in descriptor.
     """
-    if descriptor.full_name not in self._classes:
+    if descriptor not in self._classes:
       descriptor_name = descriptor.name
       if str is bytes:  # PY2
         descriptor_name = descriptor.name.encode('ascii', 'ignore')
@@ -75,16 +75,16 @@ class MessageFactory(object):
           (message.Message,),
           {'DESCRIPTOR': descriptor, '__module__': None})
           # If module not set, it wrongly points to the reflection.py module.
-      self._classes[descriptor.full_name] = result_class
+      self._classes[descriptor] = result_class
       for field in descriptor.fields:
         if field.message_type:
           self.GetPrototype(field.message_type)
       for extension in result_class.DESCRIPTOR.extensions:
-        if extension.containing_type.full_name not in self._classes:
+        if extension.containing_type not in self._classes:
           self.GetPrototype(extension.containing_type)
-        extended_class = self._classes[extension.containing_type.full_name]
+        extended_class = self._classes[extension.containing_type]
         extended_class.RegisterExtension(extension)
-    return self._classes[descriptor.full_name]
+    return self._classes[descriptor]
 
   def GetMessages(self, files):
     """Gets all the messages from a specified file.
@@ -116,9 +116,9 @@ class MessageFactory(object):
       # an error if they were different.
 
       for extension in file_desc.extensions_by_name.values():
-        if extension.containing_type.full_name not in self._classes:
+        if extension.containing_type not in self._classes:
           self.GetPrototype(extension.containing_type)
-        extended_class = self._classes[extension.containing_type.full_name]
+        extended_class = self._classes[extension.containing_type]
         extended_class.RegisterExtension(extension)
     return result
 
@@ -130,13 +130,22 @@ def GetMessages(file_protos):
   """Builds a dictionary of all the messages available in a set of files.
 
   Args:
-    file_protos: A sequence of file protos to build messages out of.
+    file_protos: Iterable of FileDescriptorProto to build messages out of.
 
   Returns:
     A dictionary mapping proto names to the message classes. This will include
     any dependent messages as well as any messages defined in the same file as
     a specified message.
   """
-  for file_proto in file_protos:
+  # The cpp implementation of the protocol buffer library requires to add the
+  # message in topological order of the dependency graph.
+  file_by_name = {file_proto.name: file_proto for file_proto in file_protos}
+  def _AddFile(file_proto):
+    for dependency in file_proto.dependency:
+      if dependency in file_by_name:
+        # Remove from elements to be visited, in order to cut cycles.
+        _AddFile(file_by_name.pop(dependency))
     _FACTORY.pool.Add(file_proto)
+  while file_by_name:
+    _AddFile(file_by_name.popitem()[1])
   return _FACTORY.GetMessages([file_proto.name for file_proto in file_protos])
diff --git a/python/google/protobuf/proto_api.h b/python/google/protobuf/proto_api.h
new file mode 100644
index 00000000..64d8dda9
--- /dev/null
+++ b/python/google/protobuf/proto_api.h
@@ -0,0 +1,92 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file can be included by other C++ libraries, typically extension modules
+// which want to interact with the Python Messages coming from the "cpp"
+// implementation of protocol buffers.
+//
+// Usage:
+// Declare a (probably static) variable to hold the API:
+//    const PyProto_API* py_proto_api;
+// In some initialization function, write:
+//    py_proto_api = static_cast<const PyProto_API*>(PyCapsule_Import(
+//        PyProtoAPICapsuleName(), 0));
+//    if (!py_proto_api) { ...handle ImportError... }
+// Then use the methods of the returned class:
+//    py_proto_api->GetMessagePointer(...);
+
+#ifndef PYTHON_GOOGLE_PROTOBUF_PROTO_API_H__
+#define PYTHON_GOOGLE_PROTOBUF_PROTO_API_H__
+
+#include <Python.h>
+
+namespace google {
+namespace protobuf {
+
+class Message;
+
+namespace python {
+
+// Note on the implementation:
+// This API is designed after
+// https://docs.python.org/3/extending/extending.html#providing-a-c-api-for-an-extension-module
+// The class below contains no mutable state, and all methods are "const";
+// we use a C++ class instead of a C struct with functions pointers just because
+// the code looks more readable.
+struct PyProto_API {
+  // The API object is created at initialization time and never freed.
+  // This destructor is never called.
+  virtual ~PyProto_API() {}
+
+  // Operations on Messages.
+
+  // If the passed object is a Python Message, returns its internal pointer.
+  // Otherwise, returns NULL with an exception set.
+  virtual const Message* GetMessagePointer(PyObject* msg) const = 0;
+
+  // If the passed object is a Python Message, returns a mutable pointer.
+  // Otherwise, returns NULL with an exception set.
+  // This function will succeed only if there are no other Python objects
+  // pointing to the message, like submessages or repeated containers.
+  // With the current implementation, only empty messages are in this case.
+  virtual Message* GetMutableMessagePointer(PyObject* msg) const = 0;
+};
+
+inline const char* PyProtoAPICapsuleName() {
+  static const char kCapsuleName[] =
+      "protobuf.python.google.protobuf.cpp._message.proto_API";
+  return kCapsuleName;
+}
+
+}  // namespace python
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // PYTHON_GOOGLE_PROTOBUF_PROTO_API_H__
diff --git a/python/google/protobuf/pyext/descriptor.cc b/python/google/protobuf/pyext/descriptor.cc
index 924ae0b9..8af0cb12 100644
--- a/python/google/protobuf/pyext/descriptor.cc
+++ b/python/google/protobuf/pyext/descriptor.cc
@@ -32,6 +32,7 @@
 
 #include <Python.h>
 #include <frameobject.h>
+#include <google/protobuf/stubs/hash.h>
 #include <string>
 
 #include <google/protobuf/io/coded_stream.h>
@@ -106,10 +107,6 @@ bool _CalledFromGeneratedFile(int stacklevel) {
       return false;
     }
   }
-  if (frame->f_globals != frame->f_locals) {
-    // Not at global module scope
-    return false;
-  }
 
   if (frame->f_code->co_filename == NULL) {
     return false;
@@ -122,6 +119,10 @@ bool _CalledFromGeneratedFile(int stacklevel) {
     PyErr_Clear();
     return false;
   }
+  if ((filename_size < 3) || (strcmp(&filename[filename_size - 3], ".py") != 0)) {
+    // Cython's stack does not have .py file name and is not at global module scope.
+    return true;
+  }
   if (filename_size < 7) {
     // filename is too short.
     return false;
@@ -130,6 +131,11 @@ bool _CalledFromGeneratedFile(int stacklevel) {
     // Filename is not ending with _pb2.
     return false;
   }
+  
+  if (frame->f_globals != frame->f_locals) {
+    // Not at global module scope
+    return false;
+  }
 #endif
   return true;
 }
@@ -187,38 +193,35 @@ const FileDescriptor* GetFileDescriptor(const MethodDescriptor* descriptor) {
 // Always returns a new reference.
 template<class DescriptorClass>
 static PyObject* GetOrBuildOptions(const DescriptorClass *descriptor) {
-  // Options (and their extensions) are completely resolved in the proto file
-  // containing the descriptor.
-  PyDescriptorPool* pool = GetDescriptorPool_FromPool(
+  // Options are cached in the pool that owns the descriptor.
+  // First search in the cache.
+  PyDescriptorPool* caching_pool = GetDescriptorPool_FromPool(
       GetFileDescriptor(descriptor)->pool());
-
   hash_map<const void*, PyObject*>* descriptor_options =
-      pool->descriptor_options;
-  // First search in the cache.
+      caching_pool->descriptor_options;
   if (descriptor_options->find(descriptor) != descriptor_options->end()) {
     PyObject *value = (*descriptor_options)[descriptor];
     Py_INCREF(value);
     return value;
   }
 
+  // Similar to the C++ implementation, we return an Options object from the
+  // default (generated) factory, so that client code know that they can use
+  // extensions from generated files:
+  //    d.GetOptions().Extensions[some_pb2.extension]
+  //
+  // The consequence is that extensions not defined in the default pool won't
+  // be available.  If needed, we could add an optional 'message_factory'
+  // parameter to the GetOptions() function.
+  PyMessageFactory* message_factory =
+      GetDefaultDescriptorPool()->py_message_factory;
+
   // Build the Options object: get its Python class, and make a copy of the C++
   // read-only instance.
   const Message& options(descriptor->options());
   const Descriptor *message_type = options.GetDescriptor();
-  PyMessageFactory* message_factory = pool->py_message_factory;
-  CMessageClass* message_class = message_factory::GetMessageClass(
-      message_factory, message_type);
-  if (message_class == NULL) {
-    // The Options message was not found in the current DescriptorPool.
-    // This means that the pool cannot contain any extensions to the Options
-    // message either, so falling back to the basic pool we can only increase
-    // the chances of successfully parsing the options.
-    PyErr_Clear();
-    pool = GetDefaultDescriptorPool();
-    message_factory = pool->py_message_factory;
-    message_class = message_factory::GetMessageClass(
+  CMessageClass* message_class = message_factory::GetOrCreateMessageClass(
       message_factory, message_type);
-  }
   if (message_class == NULL) {
     PyErr_Format(PyExc_TypeError, "Could not retrieve class for Options: %s",
                  message_type->full_name().c_str());
@@ -247,7 +250,8 @@ static PyObject* GetOrBuildOptions(const DescriptorClass *descriptor) {
     options.SerializeToString(&serialized);
     io::CodedInputStream input(
         reinterpret_cast<const uint8*>(serialized.c_str()), serialized.size());
-    input.SetExtensionRegistry(pool->pool, message_factory->message_factory);
+    input.SetExtensionRegistry(message_factory->pool->pool,
+                               message_factory->message_factory);
     bool success = cmsg->message->MergePartialFromCodedStream(&input);
     if (!success) {
       PyErr_Format(PyExc_ValueError, "Error parsing Options message");
@@ -563,6 +567,11 @@ static int SetOptions(PyBaseDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyBaseDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
+
 static PyObject* CopyToProto(PyBaseDescriptor *self, PyObject *target) {
   return CopyToPythonProto<DescriptorProto>(_GetDescriptor(self), target);
 }
@@ -622,6 +631,8 @@ static PyGetSetDef Getters[] = {
   { "is_extendable", (getter)IsExtendable, (setter)NULL},
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   { "syntax", (getter)GetSyntax, (setter)NULL, "Syntax"},
   {NULL}
 };
@@ -708,6 +719,10 @@ static PyObject* GetJsonName(PyBaseDescriptor* self, void *closure) {
   return PyString_FromCppString(_GetDescriptor(self)->json_name());
 }
 
+static PyObject* GetFile(PyBaseDescriptor *self, void *closure) {
+  return PyFileDescriptor_FromDescriptor(_GetDescriptor(self)->file());
+}
+
 static PyObject* GetType(PyBaseDescriptor *self, void *closure) {
   return PyInt_FromLong(_GetDescriptor(self)->type());
 }
@@ -780,7 +795,7 @@ static PyObject* GetDefaultValue(PyBaseDescriptor *self, void *closure) {
       break;
     }
     case FieldDescriptor::CPPTYPE_STRING: {
-      string value = _GetDescriptor(self)->default_value_string();
+      const string& value = _GetDescriptor(self)->default_value_string();
       result = ToStringObject(_GetDescriptor(self), value);
       break;
     }
@@ -892,12 +907,17 @@ static int SetOptions(PyBaseDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyBaseDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
 
 static PyGetSetDef Getters[] = {
   { "full_name", (getter)GetFullName, NULL, "Full name"},
   { "name", (getter)GetName, NULL, "Unqualified name"},
   { "camelcase_name", (getter)GetCamelcaseName, NULL, "Camelcase name"},
   { "json_name", (getter)GetJsonName, NULL, "Json name"},
+  { "file", (getter)GetFile, NULL, "File Descriptor"},
   { "type", (getter)GetType, NULL, "C++ Type"},
   { "cpp_type", (getter)GetCppType, NULL, "C++ Type"},
   { "label", (getter)GetLabel, NULL, "Label"},
@@ -920,6 +940,8 @@ static PyGetSetDef Getters[] = {
     "Containing oneof"},
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   {NULL}
 };
 
@@ -1049,6 +1071,11 @@ static int SetOptions(PyBaseDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyBaseDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
+
 static PyObject* CopyToProto(PyBaseDescriptor *self, PyObject *target) {
   return CopyToPythonProto<EnumDescriptorProto>(_GetDescriptor(self), target);
 }
@@ -1073,6 +1100,8 @@ static PyGetSetDef Getters[] = {
     "Containing type"},
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   {NULL}
 };
 
@@ -1173,6 +1202,10 @@ static int SetOptions(PyBaseDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyBaseDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
 
 static PyGetSetDef Getters[] = {
   { "name", (getter)GetName, NULL, "name"},
@@ -1182,6 +1215,8 @@ static PyGetSetDef Getters[] = {
 
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   {NULL}
 };
 
@@ -1324,6 +1359,11 @@ static int SetOptions(PyFileDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyFileDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
+
 static PyObject* GetSyntax(PyFileDescriptor *self, void *closure) {
   return PyString_InternFromString(
       FileDescriptor::SyntaxName(_GetDescriptor(self)->syntax()));
@@ -1349,6 +1389,8 @@ static PyGetSetDef Getters[] = {
 
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   { "syntax", (getter)GetSyntax, (setter)NULL, "Syntax"},
   {NULL}
 };
@@ -1494,6 +1536,11 @@ static int SetOptions(PyBaseDescriptor *self, PyObject *value,
   return CheckCalledFromGeneratedFile("_options");
 }
 
+static int SetSerializedOptions(PyBaseDescriptor *self, PyObject *value,
+                                void *closure) {
+  return CheckCalledFromGeneratedFile("_serialized_options");
+}
+
 static PyGetSetDef Getters[] = {
   { "name", (getter)GetName, NULL, "Name"},
   { "full_name", (getter)GetFullName, NULL, "Full name"},
@@ -1502,6 +1549,8 @@ static PyGetSetDef Getters[] = {
   { "containing_type", (getter)GetContainingType, NULL, "Containing type"},
   { "has_options", (getter)GetHasOptions, (setter)SetHasOptions, "Has Options"},
   { "_options", (getter)NULL, (setter)SetOptions, "Options"},
+  { "_serialized_options", (getter)NULL, (setter)SetSerializedOptions,
+    "Serialized Options"},
   { "fields", (getter)GetFields, NULL, "Fields"},
   {NULL}
 };
@@ -1569,6 +1618,10 @@ static PyObject* GetFullName(PyBaseDescriptor* self, void *closure) {
   return PyString_FromCppString(_GetDescriptor(self)->full_name());
 }
 
+static PyObject* GetFile(PyBaseDescriptor *self, void *closure) {
+  return PyFileDescriptor_FromDescriptor(_GetDescriptor(self)->file());
+}
+
 static PyObject* GetIndex(PyBaseDescriptor *self, void *closure) {
   return PyInt_FromLong(_GetDescriptor(self)->index());
 }
@@ -1610,6 +1663,7 @@ static PyObject* CopyToProto(PyBaseDescriptor *self, PyObject *target) {
 static PyGetSetDef Getters[] = {
   { "name", (getter)GetName, NULL, "Name", NULL},
   { "full_name", (getter)GetFullName, NULL, "Full name", NULL},
+  { "file", (getter)GetFile, NULL, "File descriptor"},
   { "index", (getter)GetIndex, NULL, "Index", NULL},
 
   { "methods", (getter)GetMethods, NULL, "Methods", NULL},
@@ -1666,6 +1720,15 @@ PyObject* PyServiceDescriptor_FromDescriptor(
       &PyServiceDescriptor_Type, service_descriptor, NULL);
 }
 
+const ServiceDescriptor* PyServiceDescriptor_AsDescriptor(PyObject* obj) {
+  if (!PyObject_TypeCheck(obj, &PyServiceDescriptor_Type)) {
+    PyErr_SetString(PyExc_TypeError, "Not a ServiceDescriptor");
+    return NULL;
+  }
+  return reinterpret_cast<const ServiceDescriptor*>(
+      reinterpret_cast<PyBaseDescriptor*>(obj)->descriptor);
+}
+
 namespace method_descriptor {
 
 // Unchecked accessor to the C++ pointer.
@@ -1769,6 +1832,15 @@ PyObject* PyMethodDescriptor_FromDescriptor(
       &PyMethodDescriptor_Type, method_descriptor, NULL);
 }
 
+const MethodDescriptor* PyMethodDescriptor_AsDescriptor(PyObject* obj) {
+  if (!PyObject_TypeCheck(obj, &PyMethodDescriptor_Type)) {
+    PyErr_SetString(PyExc_TypeError, "Not a MethodDescriptor");
+    return NULL;
+  }
+  return reinterpret_cast<const MethodDescriptor*>(
+      reinterpret_cast<PyBaseDescriptor*>(obj)->descriptor);
+}
+
 // Add a enum values to a type dictionary.
 static bool AddEnumValues(PyTypeObject *type,
                           const EnumDescriptor* enum_descriptor) {
diff --git a/python/google/protobuf/pyext/descriptor.h b/python/google/protobuf/pyext/descriptor.h
index 1ae0e672..f081df84 100644
--- a/python/google/protobuf/pyext/descriptor.h
+++ b/python/google/protobuf/pyext/descriptor.h
@@ -80,6 +80,8 @@ const Descriptor* PyMessageDescriptor_AsDescriptor(PyObject* obj);
 const FieldDescriptor* PyFieldDescriptor_AsDescriptor(PyObject* obj);
 const EnumDescriptor* PyEnumDescriptor_AsDescriptor(PyObject* obj);
 const FileDescriptor* PyFileDescriptor_AsDescriptor(PyObject* obj);
+const ServiceDescriptor* PyServiceDescriptor_AsDescriptor(PyObject* obj);
+const MethodDescriptor* PyMethodDescriptor_AsDescriptor(PyObject* obj);
 
 // Returns the raw C++ pointer.
 const void* PyDescriptor_AsVoidPtr(PyObject* obj);
diff --git a/python/google/protobuf/pyext/descriptor_containers.cc b/python/google/protobuf/pyext/descriptor_containers.cc
index d0aae9c9..bc007f7e 100644
--- a/python/google/protobuf/pyext/descriptor_containers.cc
+++ b/python/google/protobuf/pyext/descriptor_containers.cc
@@ -957,55 +957,55 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->field_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindFieldByName(name);
 }
 
-static ItemDescriptor GetByCamelcaseName(PyContainer* self,
+static const void* GetByCamelcaseName(PyContainer* self,
                                          const string& name) {
   return GetDescriptor(self)->FindFieldByCamelcaseName(name);
 }
 
-static ItemDescriptor GetByNumber(PyContainer* self, int number) {
+static const void* GetByNumber(PyContainer* self, int number) {
   return GetDescriptor(self)->FindFieldByNumber(number);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->field(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFieldDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFieldDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static const string& GetItemCamelcaseName(ItemDescriptor item) {
-  return item->camelcase_name();
+static const string& GetItemCamelcaseName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->camelcase_name();
 }
 
-static int GetItemNumber(ItemDescriptor item) {
-  return item->number();
+static int GetItemNumber(const void* item) {
+  return static_cast<ItemDescriptor>(item)->number();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageFields",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)GetByCamelcaseName,
-  (GetByNumberMethod)GetByNumber,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)GetItemCamelcaseName,
-  (GetItemNumberMethod)GetItemNumber,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  GetByCamelcaseName,
+  GetByNumber,
+  NewObjectFromItem,
+  GetItemName,
+  GetItemCamelcaseName,
+  GetItemNumber,
+  GetItemIndex,
 };
 
 }  // namespace fields
@@ -1035,38 +1035,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->nested_type_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindNestedTypeByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->nested_type(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyMessageDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyMessageDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageNestedTypes",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace nested_types
@@ -1087,38 +1087,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->enum_type_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindEnumTypeByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->enum_type(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyEnumDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyEnumDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageNestedEnums",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace enums
@@ -1150,11 +1150,11 @@ static int Count(PyContainer* self) {
   return count;
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindEnumValueByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   // This is not optimal, but the number of enums *types* in a given message
   // is small.  This function is only used when iterating over the mapping.
   const EnumDescriptor* enum_type = NULL;
@@ -1173,26 +1173,27 @@ static ItemDescriptor GetByIndex(PyContainer* self, int index) {
   return enum_type->value(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyEnumValueDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyEnumValueDescriptor_FromDescriptor(
+      static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageEnumValues",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)NULL,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  NULL,
 };
 
 }  // namespace enumvalues
@@ -1209,38 +1210,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->extension_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindExtensionByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->extension(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFieldDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFieldDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageExtensions",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace extensions
@@ -1261,38 +1262,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->oneof_decl_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindOneofByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->oneof_decl(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyOneofDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyOneofDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "MessageOneofs",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace oneofs
@@ -1323,46 +1324,47 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->value_count();
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->value(index);
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindValueByName(name);
 }
 
-static ItemDescriptor GetByNumber(PyContainer* self, int number) {
+static const void* GetByNumber(PyContainer* self, int number) {
   return GetDescriptor(self)->FindValueByNumber(number);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyEnumValueDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyEnumValueDescriptor_FromDescriptor(
+      static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemNumber(ItemDescriptor item) {
-  return item->number();
+static int GetItemNumber(const void* item) {
+  return static_cast<ItemDescriptor>(item)->number();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "EnumValues",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)GetByNumber,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)GetItemNumber,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  GetByNumber,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  GetItemNumber,
+  GetItemIndex,
 };
 
 }  // namespace enumvalues
@@ -1397,30 +1399,30 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->field_count();
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->field(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFieldDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFieldDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index_in_oneof();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index_in_oneof();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "OneofFields",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)NULL,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)NULL,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  NULL,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  NULL,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace fields
@@ -1447,38 +1449,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->method_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindMethodByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->method(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyMethodDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyMethodDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "ServiceMethods",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace methods
@@ -1509,38 +1511,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->message_type_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindMessageTypeByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->message_type(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyMessageDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyMessageDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FileMessages",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace messages
@@ -1557,38 +1559,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->enum_type_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindEnumTypeByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->enum_type(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyEnumDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyEnumDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FileEnums",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace enums
@@ -1605,38 +1607,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->extension_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindExtensionByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->extension(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFieldDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFieldDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FileExtensions",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace extensions
@@ -1653,38 +1655,38 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->service_count();
 }
 
-static ItemDescriptor GetByName(PyContainer* self, const string& name) {
+static const void* GetByName(PyContainer* self, const string& name) {
   return GetDescriptor(self)->FindServiceByName(name);
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->service(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyServiceDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyServiceDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
-static const string& GetItemName(ItemDescriptor item) {
-  return item->name();
+static const string& GetItemName(const void* item) {
+  return static_cast<ItemDescriptor>(item)->name();
 }
 
-static int GetItemIndex(ItemDescriptor item) {
-  return item->index();
+static int GetItemIndex(const void* item) {
+  return static_cast<ItemDescriptor>(item)->index();
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FileServices",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)GetByName,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)GetItemName,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)GetItemIndex,
+  Count,
+  GetByIndex,
+  GetByName,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  GetItemName,
+  NULL,
+  NULL,
+  GetItemIndex,
 };
 
 }  // namespace services
@@ -1701,26 +1703,26 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->dependency_count();
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->dependency(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFileDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFileDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FileDependencies",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)NULL,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)NULL,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)NULL,
+  Count,
+  GetByIndex,
+  NULL,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
 };
 
 }  // namespace dependencies
@@ -1737,26 +1739,26 @@ static int Count(PyContainer* self) {
   return GetDescriptor(self)->public_dependency_count();
 }
 
-static ItemDescriptor GetByIndex(PyContainer* self, int index) {
+static const void* GetByIndex(PyContainer* self, int index) {
   return GetDescriptor(self)->public_dependency(index);
 }
 
-static PyObject* NewObjectFromItem(ItemDescriptor item) {
-  return PyFileDescriptor_FromDescriptor(item);
+static PyObject* NewObjectFromItem(const void* item) {
+  return PyFileDescriptor_FromDescriptor(static_cast<ItemDescriptor>(item));
 }
 
 static DescriptorContainerDef ContainerDef = {
   "FilePublicDependencies",
-  (CountMethod)Count,
-  (GetByIndexMethod)GetByIndex,
-  (GetByNameMethod)NULL,
-  (GetByCamelcaseNameMethod)NULL,
-  (GetByNumberMethod)NULL,
-  (NewObjectFromItemMethod)NewObjectFromItem,
-  (GetItemNameMethod)NULL,
-  (GetItemCamelcaseNameMethod)NULL,
-  (GetItemNumberMethod)NULL,
-  (GetItemIndexMethod)NULL,
+  Count,
+  GetByIndex,
+  NULL,
+  NULL,
+  NULL,
+  NewObjectFromItem,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
 };
 
 }  // namespace public_dependencies
diff --git a/python/google/protobuf/pyext/descriptor_pool.cc b/python/google/protobuf/pyext/descriptor_pool.cc
index fa66bf9a..95882aeb 100644
--- a/python/google/protobuf/pyext/descriptor_pool.cc
+++ b/python/google/protobuf/pyext/descriptor_pool.cc
@@ -39,6 +39,7 @@
 #include <google/protobuf/pyext/message.h>
 #include <google/protobuf/pyext/message_factory.h>
 #include <google/protobuf/pyext/scoped_pyobject_ptr.h>
+#include <google/protobuf/stubs/hash.h>
 
 #if PY_MAJOR_VERSION >= 3
   #define PyString_FromStringAndSize PyUnicode_FromStringAndSize
@@ -148,7 +149,8 @@ static PyObject* New(PyTypeObject* type,
       PyDescriptorPool_NewWithDatabase(database));
 }
 
-static void Dealloc(PyDescriptorPool* self) {
+static void Dealloc(PyObject* pself) {
+  PyDescriptorPool* self = reinterpret_cast<PyDescriptorPool*>(pself);
   descriptor_pool_map.erase(self->pool);
   Py_CLEAR(self->py_message_factory);
   for (hash_map<const void*, PyObject*>::iterator it =
@@ -162,7 +164,7 @@ static void Dealloc(PyDescriptorPool* self) {
   Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
 }
 
-PyObject* FindMessageByName(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindMessageByName(PyObject* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
   if (PyString_AsStringAndSize(arg, &name, &name_size) < 0) {
@@ -170,7 +172,8 @@ PyObject* FindMessageByName(PyDescriptorPool* self, PyObject* arg) {
   }
 
   const Descriptor* message_descriptor =
-      self->pool->FindMessageTypeByName(string(name, name_size));
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindMessageTypeByName(
+          string(name, name_size));
 
   if (message_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find message %.200s", name);
@@ -183,7 +186,7 @@ PyObject* FindMessageByName(PyDescriptorPool* self, PyObject* arg) {
 
 
 
-PyObject* FindFileByName(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindFileByName(PyObject* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
   if (PyString_AsStringAndSize(arg, &name, &name_size) < 0) {
@@ -191,7 +194,8 @@ PyObject* FindFileByName(PyDescriptorPool* self, PyObject* arg) {
   }
 
   const FileDescriptor* file_descriptor =
-      self->pool->FindFileByName(string(name, name_size));
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindFileByName(
+          string(name, name_size));
   if (file_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find file %.200s", name);
     return NULL;
@@ -217,6 +221,10 @@ PyObject* FindFieldByName(PyDescriptorPool* self, PyObject* arg) {
   return PyFieldDescriptor_FromDescriptor(field_descriptor);
 }
 
+static PyObject* FindFieldByNameMethod(PyObject* self, PyObject* arg) {
+  return FindFieldByName(reinterpret_cast<PyDescriptorPool*>(self), arg);
+}
+
 PyObject* FindExtensionByName(PyDescriptorPool* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
@@ -234,6 +242,10 @@ PyObject* FindExtensionByName(PyDescriptorPool* self, PyObject* arg) {
   return PyFieldDescriptor_FromDescriptor(field_descriptor);
 }
 
+static PyObject* FindExtensionByNameMethod(PyObject* self, PyObject* arg) {
+  return FindExtensionByName(reinterpret_cast<PyDescriptorPool*>(self), arg);
+}
+
 PyObject* FindEnumTypeByName(PyDescriptorPool* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
@@ -251,6 +263,10 @@ PyObject* FindEnumTypeByName(PyDescriptorPool* self, PyObject* arg) {
   return PyEnumDescriptor_FromDescriptor(enum_descriptor);
 }
 
+static PyObject* FindEnumTypeByNameMethod(PyObject* self, PyObject* arg) {
+  return FindEnumTypeByName(reinterpret_cast<PyDescriptorPool*>(self), arg);
+}
+
 PyObject* FindOneofByName(PyDescriptorPool* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
@@ -268,7 +284,11 @@ PyObject* FindOneofByName(PyDescriptorPool* self, PyObject* arg) {
   return PyOneofDescriptor_FromDescriptor(oneof_descriptor);
 }
 
-PyObject* FindServiceByName(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindOneofByNameMethod(PyObject* self, PyObject* arg) {
+  return FindOneofByName(reinterpret_cast<PyDescriptorPool*>(self), arg);
+}
+
+static PyObject* FindServiceByName(PyObject* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
   if (PyString_AsStringAndSize(arg, &name, &name_size) < 0) {
@@ -276,7 +296,8 @@ PyObject* FindServiceByName(PyDescriptorPool* self, PyObject* arg) {
   }
 
   const ServiceDescriptor* service_descriptor =
-      self->pool->FindServiceByName(string(name, name_size));
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindServiceByName(
+          string(name, name_size));
   if (service_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find service %.200s", name);
     return NULL;
@@ -285,7 +306,7 @@ PyObject* FindServiceByName(PyDescriptorPool* self, PyObject* arg) {
   return PyServiceDescriptor_FromDescriptor(service_descriptor);
 }
 
-PyObject* FindMethodByName(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindMethodByName(PyObject* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
   if (PyString_AsStringAndSize(arg, &name, &name_size) < 0) {
@@ -293,7 +314,8 @@ PyObject* FindMethodByName(PyDescriptorPool* self, PyObject* arg) {
   }
 
   const MethodDescriptor* method_descriptor =
-      self->pool->FindMethodByName(string(name, name_size));
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindMethodByName(
+          string(name, name_size));
   if (method_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find method %.200s", name);
     return NULL;
@@ -302,7 +324,7 @@ PyObject* FindMethodByName(PyDescriptorPool* self, PyObject* arg) {
   return PyMethodDescriptor_FromDescriptor(method_descriptor);
 }
 
-PyObject* FindFileContainingSymbol(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindFileContainingSymbol(PyObject* self, PyObject* arg) {
   Py_ssize_t name_size;
   char* name;
   if (PyString_AsStringAndSize(arg, &name, &name_size) < 0) {
@@ -310,7 +332,8 @@ PyObject* FindFileContainingSymbol(PyDescriptorPool* self, PyObject* arg) {
   }
 
   const FileDescriptor* file_descriptor =
-      self->pool->FindFileContainingSymbol(string(name, name_size));
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindFileContainingSymbol(
+          string(name, name_size));
   if (file_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find symbol %.200s", name);
     return NULL;
@@ -319,7 +342,7 @@ PyObject* FindFileContainingSymbol(PyDescriptorPool* self, PyObject* arg) {
   return PyFileDescriptor_FromDescriptor(file_descriptor);
 }
 
-PyObject* FindExtensionByNumber(PyDescriptorPool* self, PyObject* args) {
+static PyObject* FindExtensionByNumber(PyObject* self, PyObject* args) {
   PyObject* message_descriptor;
   int number;
   if (!PyArg_ParseTuple(args, "Oi", &message_descriptor, &number)) {
@@ -332,7 +355,8 @@ PyObject* FindExtensionByNumber(PyDescriptorPool* self, PyObject* args) {
   }
 
   const FieldDescriptor* extension_descriptor =
-      self->pool->FindExtensionByNumber(descriptor, number);
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindExtensionByNumber(
+          descriptor, number);
   if (extension_descriptor == NULL) {
     PyErr_Format(PyExc_KeyError, "Couldn't find extension %d", number);
     return NULL;
@@ -341,14 +365,15 @@ PyObject* FindExtensionByNumber(PyDescriptorPool* self, PyObject* args) {
   return PyFieldDescriptor_FromDescriptor(extension_descriptor);
 }
 
-PyObject* FindAllExtensions(PyDescriptorPool* self, PyObject* arg) {
+static PyObject* FindAllExtensions(PyObject* self, PyObject* arg) {
   const Descriptor* descriptor = PyMessageDescriptor_AsDescriptor(arg);
   if (descriptor == NULL) {
     return NULL;
   }
 
   std::vector<const FieldDescriptor*> extensions;
-  self->pool->FindAllExtensions(descriptor, &extensions);
+  reinterpret_cast<PyDescriptorPool*>(self)->pool->FindAllExtensions(
+      descriptor, &extensions);
 
   ScopedPyObjectPtr result(PyList_New(extensions.size()));
   if (result == NULL) {
@@ -373,14 +398,15 @@ PyObject* FindAllExtensions(PyDescriptorPool* self, PyObject* arg) {
 // call a function that will just be a no-op?
 // TODO(amauryfa): Need to investigate further.
 
-PyObject* AddFileDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
+static PyObject* AddFileDescriptor(PyObject* self, PyObject* descriptor) {
   const FileDescriptor* file_descriptor =
       PyFileDescriptor_AsDescriptor(descriptor);
   if (!file_descriptor) {
     return NULL;
   }
   if (file_descriptor !=
-      self->pool->FindFileByName(file_descriptor->name())) {
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindFileByName(
+          file_descriptor->name())) {
     PyErr_Format(PyExc_ValueError,
                  "The file descriptor %s does not belong to this pool",
                  file_descriptor->name().c_str());
@@ -389,14 +415,15 @@ PyObject* AddFileDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
   Py_RETURN_NONE;
 }
 
-PyObject* AddDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
+static PyObject* AddDescriptor(PyObject* self, PyObject* descriptor) {
   const Descriptor* message_descriptor =
       PyMessageDescriptor_AsDescriptor(descriptor);
   if (!message_descriptor) {
     return NULL;
   }
   if (message_descriptor !=
-      self->pool->FindMessageTypeByName(message_descriptor->full_name())) {
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindMessageTypeByName(
+          message_descriptor->full_name())) {
     PyErr_Format(PyExc_ValueError,
                  "The message descriptor %s does not belong to this pool",
                  message_descriptor->full_name().c_str());
@@ -405,14 +432,15 @@ PyObject* AddDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
   Py_RETURN_NONE;
 }
 
-PyObject* AddEnumDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
+static PyObject* AddEnumDescriptor(PyObject* self, PyObject* descriptor) {
   const EnumDescriptor* enum_descriptor =
       PyEnumDescriptor_AsDescriptor(descriptor);
   if (!enum_descriptor) {
     return NULL;
   }
   if (enum_descriptor !=
-      self->pool->FindEnumTypeByName(enum_descriptor->full_name())) {
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindEnumTypeByName(
+          enum_descriptor->full_name())) {
     PyErr_Format(PyExc_ValueError,
                  "The enum descriptor %s does not belong to this pool",
                  enum_descriptor->full_name().c_str());
@@ -421,14 +449,15 @@ PyObject* AddEnumDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
   Py_RETURN_NONE;
 }
 
-PyObject* AddExtensionDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
+static PyObject* AddExtensionDescriptor(PyObject* self, PyObject* descriptor) {
   const FieldDescriptor* extension_descriptor =
       PyFieldDescriptor_AsDescriptor(descriptor);
   if (!extension_descriptor) {
     return NULL;
   }
   if (extension_descriptor !=
-      self->pool->FindExtensionByName(extension_descriptor->full_name())) {
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindExtensionByName(
+          extension_descriptor->full_name())) {
     PyErr_Format(PyExc_ValueError,
                  "The extension descriptor %s does not belong to this pool",
                  extension_descriptor->full_name().c_str());
@@ -437,8 +466,24 @@ PyObject* AddExtensionDescriptor(PyDescriptorPool* self, PyObject* descriptor) {
   Py_RETURN_NONE;
 }
 
-// The code below loads new Descriptors from a serialized FileDescriptorProto.
+static PyObject* AddServiceDescriptor(PyObject* self, PyObject* descriptor) {
+  const ServiceDescriptor* service_descriptor =
+      PyServiceDescriptor_AsDescriptor(descriptor);
+  if (!service_descriptor) {
+    return NULL;
+  }
+  if (service_descriptor !=
+      reinterpret_cast<PyDescriptorPool*>(self)->pool->FindServiceByName(
+          service_descriptor->full_name())) {
+    PyErr_Format(PyExc_ValueError,
+                 "The service descriptor %s does not belong to this pool",
+                 service_descriptor->full_name().c_str());
+    return NULL;
+  }
+  Py_RETURN_NONE;
+}
 
+// The code below loads new Descriptors from a serialized FileDescriptorProto.
 
 // Collects errors that occur during proto file building to allow them to be
 // propagated in the python exception instead of only living in ERROR logs.
@@ -465,7 +510,8 @@ class BuildFileErrorCollector : public DescriptorPool::ErrorCollector {
   bool had_errors;
 };
 
-PyObject* AddSerializedFile(PyDescriptorPool* self, PyObject* serialized_pb) {
+static PyObject* AddSerializedFile(PyObject* pself, PyObject* serialized_pb) {
+  PyDescriptorPool* self = reinterpret_cast<PyDescriptorPool*>(pself);
   char* message_type;
   Py_ssize_t message_len;
 
@@ -513,7 +559,7 @@ PyObject* AddSerializedFile(PyDescriptorPool* self, PyObject* serialized_pb) {
       descriptor, serialized_pb);
 }
 
-PyObject* Add(PyDescriptorPool* self, PyObject* file_descriptor_proto) {
+static PyObject* Add(PyObject* self, PyObject* file_descriptor_proto) {
   ScopedPyObjectPtr serialized_pb(
       PyObject_CallMethod(file_descriptor_proto, "SerializeToString", NULL));
   if (serialized_pb == NULL) {
@@ -523,44 +569,46 @@ PyObject* Add(PyDescriptorPool* self, PyObject* file_descriptor_proto) {
 }
 
 static PyMethodDef Methods[] = {
-  { "Add", (PyCFunction)Add, METH_O,
+  { "Add", Add, METH_O,
     "Adds the FileDescriptorProto and its types to this pool." },
-  { "AddSerializedFile", (PyCFunction)AddSerializedFile, METH_O,
+  { "AddSerializedFile", AddSerializedFile, METH_O,
     "Adds a serialized FileDescriptorProto to this pool." },
 
   // TODO(amauryfa): Understand why the Python implementation differs from
   // this one, ask users to use another API and deprecate these functions.
-  { "AddFileDescriptor", (PyCFunction)AddFileDescriptor, METH_O,
+  { "AddFileDescriptor", AddFileDescriptor, METH_O,
+    "No-op. Add() must have been called before." },
+  { "AddDescriptor", AddDescriptor, METH_O,
     "No-op. Add() must have been called before." },
-  { "AddDescriptor", (PyCFunction)AddDescriptor, METH_O,
+  { "AddEnumDescriptor", AddEnumDescriptor, METH_O,
     "No-op. Add() must have been called before." },
-  { "AddEnumDescriptor", (PyCFunction)AddEnumDescriptor, METH_O,
+  { "AddExtensionDescriptor", AddExtensionDescriptor, METH_O,
     "No-op. Add() must have been called before." },
-  { "AddExtensionDescriptor", (PyCFunction)AddExtensionDescriptor, METH_O,
+  { "AddServiceDescriptor", AddServiceDescriptor, METH_O,
     "No-op. Add() must have been called before." },
 
-  { "FindFileByName", (PyCFunction)FindFileByName, METH_O,
+  { "FindFileByName", FindFileByName, METH_O,
     "Searches for a file descriptor by its .proto name." },
-  { "FindMessageTypeByName", (PyCFunction)FindMessageByName, METH_O,
+  { "FindMessageTypeByName", FindMessageByName, METH_O,
     "Searches for a message descriptor by full name." },
-  { "FindFieldByName", (PyCFunction)FindFieldByName, METH_O,
+  { "FindFieldByName", FindFieldByNameMethod, METH_O,
     "Searches for a field descriptor by full name." },
-  { "FindExtensionByName", (PyCFunction)FindExtensionByName, METH_O,
+  { "FindExtensionByName", FindExtensionByNameMethod, METH_O,
     "Searches for extension descriptor by full name." },
-  { "FindEnumTypeByName", (PyCFunction)FindEnumTypeByName, METH_O,
+  { "FindEnumTypeByName", FindEnumTypeByNameMethod, METH_O,
     "Searches for enum type descriptor by full name." },
-  { "FindOneofByName", (PyCFunction)FindOneofByName, METH_O,
+  { "FindOneofByName", FindOneofByNameMethod, METH_O,
     "Searches for oneof descriptor by full name." },
-  { "FindServiceByName", (PyCFunction)FindServiceByName, METH_O,
+  { "FindServiceByName", FindServiceByName, METH_O,
     "Searches for service descriptor by full name." },
-  { "FindMethodByName", (PyCFunction)FindMethodByName, METH_O,
+  { "FindMethodByName", FindMethodByName, METH_O,
     "Searches for method descriptor by full name." },
 
-  { "FindFileContainingSymbol", (PyCFunction)FindFileContainingSymbol, METH_O,
+  { "FindFileContainingSymbol", FindFileContainingSymbol, METH_O,
     "Gets the FileDescriptor containing the specified symbol." },
-  { "FindExtensionByNumber", (PyCFunction)FindExtensionByNumber, METH_VARARGS,
+  { "FindExtensionByNumber", FindExtensionByNumber, METH_VARARGS,
     "Gets the extension descriptor for the given number." },
-  { "FindAllExtensions", (PyCFunction)FindAllExtensions, METH_O,
+  { "FindAllExtensions", FindAllExtensions, METH_O,
     "Gets all known extensions of the given message descriptor." },
   {NULL}
 };
@@ -572,7 +620,7 @@ PyTypeObject PyDescriptorPool_Type = {
   FULL_MODULE_NAME ".DescriptorPool",  // tp_name
   sizeof(PyDescriptorPool),            // tp_basicsize
   0,                                   // tp_itemsize
-  (destructor)cdescriptor_pool::Dealloc,  // tp_dealloc
+  cdescriptor_pool::Dealloc,           // tp_dealloc
   0,                                   // tp_print
   0,                                   // tp_getattr
   0,                                   // tp_setattr
diff --git a/python/google/protobuf/pyext/descriptor_pool.h b/python/google/protobuf/pyext/descriptor_pool.h
index c4d7d403..53ee53dc 100644
--- a/python/google/protobuf/pyext/descriptor_pool.h
+++ b/python/google/protobuf/pyext/descriptor_pool.h
@@ -85,6 +85,7 @@ extern PyTypeObject PyDescriptorPool_Type;
 
 namespace cdescriptor_pool {
 
+
 // Looks up a message by name.
 // Returns a message Descriptor, or NULL if not found.
 const Descriptor* FindMessageTypeByName(PyDescriptorPool* self,
diff --git a/python/google/protobuf/pyext/extension_dict.cc b/python/google/protobuf/pyext/extension_dict.cc
index 43ee5d15..018b5c2c 100644
--- a/python/google/protobuf/pyext/extension_dict.cc
+++ b/python/google/protobuf/pyext/extension_dict.cc
@@ -32,6 +32,7 @@
 // Author: tibell@google.com (Johan Tibell)
 
 #include <google/protobuf/pyext/extension_dict.h>
+#include <memory>
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -45,7 +46,6 @@
 #include <google/protobuf/pyext/repeated_composite_container.h>
 #include <google/protobuf/pyext/repeated_scalar_container.h>
 #include <google/protobuf/pyext/scoped_pyobject_ptr.h>
-#include <google/protobuf/stubs/shared_ptr.h>
 
 #if PY_MAJOR_VERSION >= 3
   #if PY_VERSION_HEX < 0x03030000
diff --git a/python/google/protobuf/pyext/extension_dict.h b/python/google/protobuf/pyext/extension_dict.h
index 65b87862..0de2c4ee 100644
--- a/python/google/protobuf/pyext/extension_dict.h
+++ b/python/google/protobuf/pyext/extension_dict.h
@@ -37,9 +37,8 @@
 #include <Python.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
+
+#include <google/protobuf/pyext/message.h>
 
 namespace google {
 namespace protobuf {
@@ -47,16 +46,8 @@ namespace protobuf {
 class Message;
 class FieldDescriptor;
 
-#ifdef _SHARED_PTR_H
-using std::shared_ptr;
-#else
-using internal::shared_ptr;
-#endif
-
 namespace python {
 
-struct CMessage;
-
 typedef struct ExtensionDict {
   PyObject_HEAD;
 
@@ -64,7 +55,7 @@ typedef struct ExtensionDict {
   // proto tree.  Every Python container class holds a
   // reference to it in order to keep it alive as long as there's a
   // Python object that references any part of the tree.
-  shared_ptr<Message> owner;
+  CMessage::OwnerRef owner;
 
   // Weak reference to parent message. Used to make sure
   // the parent is writable when an extension field is modified.
diff --git a/python/google/protobuf/pyext/map_container.cc b/python/google/protobuf/pyext/map_container.cc
index 088ddf93..6d7ee285 100644
--- a/python/google/protobuf/pyext/map_container.cc
+++ b/python/google/protobuf/pyext/map_container.cc
@@ -33,9 +33,6 @@
 #include <google/protobuf/pyext/map_container.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -76,7 +73,7 @@ class MapReflectionFriend {
 struct MapIterator {
   PyObject_HEAD;
 
-  google::protobuf::scoped_ptr< ::google::protobuf::MapIterator> iter;
+  std::unique_ptr<::google::protobuf::MapIterator> iter;
 
   // A pointer back to the container, so we can notice changes to the version.
   // We own a ref on this.
@@ -94,7 +91,7 @@ struct MapIterator {
   // as this iterator does.  This is solely for the benefit of the MapIterator
   // destructor -- we should never actually access the iterator in this state
   // except to delete it.
-  shared_ptr<Message> owner;
+  CMessage::OwnerRef owner;
 
   // The version of the map when we took the iterator to it.
   //
@@ -339,6 +336,24 @@ PyObject* GetEntryClass(PyObject* _self) {
   return reinterpret_cast<PyObject*>(message_class);
 }
 
+PyObject* MergeFrom(PyObject* _self, PyObject* arg) {
+  MapContainer* self = GetMap(_self);
+  MapContainer* other_map = GetMap(arg);
+  Message* message = self->GetMutableMessage();
+  const Message* other_message = other_map->message;
+  const Reflection* reflection = message->GetReflection();
+  const Reflection* other_reflection = other_message->GetReflection();
+  int count = other_reflection->FieldSize(
+      *other_message, other_map->parent_field_descriptor);
+  for (int i = 0 ; i < count; i ++) {
+    reflection->AddMessage(message, self->parent_field_descriptor)->MergeFrom(
+        other_reflection->GetRepeatedMessage(
+            *other_message, other_map->parent_field_descriptor, i));
+  }
+  self->version++;
+  Py_RETURN_NONE;
+}
+
 PyObject* MapReflectionFriend::Contains(PyObject* _self, PyObject* key) {
   MapContainer* self = GetMap(_self);
 
@@ -535,6 +550,8 @@ static PyMethodDef ScalarMapMethods[] = {
     "Gets the value for the given key if present, or otherwise a default" },
   { "GetEntryClass", (PyCFunction)GetEntryClass, METH_NOARGS,
     "Return the class used to build Entries of (key, value) pairs." },
+  { "MergeFrom", (PyCFunction)MergeFrom, METH_O,
+    "Merges a map into the current map." },
   /*
   { "__deepcopy__", (PyCFunction)DeepCopy, METH_VARARGS,
     "Makes a deep copy of the class." },
@@ -712,8 +729,33 @@ int MapReflectionFriend::MessageMapSetItem(PyObject* _self, PyObject* key,
   }
 
   // Delete key from map.
-  if (reflection->DeleteMapValue(message, self->parent_field_descriptor,
+  if (reflection->ContainsMapKey(*message, self->parent_field_descriptor,
                                  map_key)) {
+    // Delete key from CMessage dict.
+    MapValueRef value;
+    reflection->InsertOrLookupMapValue(message, self->parent_field_descriptor,
+                                       map_key, &value);
+    ScopedPyObjectPtr key(PyLong_FromVoidPtr(value.MutableMessageValue()));
+
+    PyObject* cmsg_value = PyDict_GetItem(self->message_dict, key.get());
+    if (cmsg_value) {
+      // Need to keep CMessage stay alive if it is still referenced after
+      // deletion. Makes a new message and swaps values into CMessage
+      // instead of just removing.
+      CMessage* cmsg =  reinterpret_cast<CMessage*>(cmsg_value);
+      Message* msg = cmsg->message;
+      cmsg->owner.reset(msg->New());
+      cmsg->message = cmsg->owner.get();
+      cmsg->parent = NULL;
+      msg->GetReflection()->Swap(msg, cmsg->message);
+      if (PyDict_DelItem(self->message_dict, key.get()) < 0) {
+        return -1;
+      }
+    }
+
+    // Delete key from map.
+    reflection->DeleteMapValue(message, self->parent_field_descriptor,
+                               map_key);
     return 0;
   } else {
     PyErr_Format(PyExc_KeyError, "Key not present in map");
@@ -785,6 +827,8 @@ static PyMethodDef MessageMapMethods[] = {
     "Alias for getitem, useful to make explicit that the map is mutated." },
   { "GetEntryClass", (PyCFunction)GetEntryClass, METH_NOARGS,
     "Return the class used to build Entries of (key, value) pairs." },
+  { "MergeFrom", (PyCFunction)MergeFrom, METH_O,
+    "Merges a map into the current map." },
   /*
   { "__deepcopy__", (PyCFunction)DeepCopy, METH_VARARGS,
     "Makes a deep copy of the class." },
diff --git a/python/google/protobuf/pyext/map_container.h b/python/google/protobuf/pyext/map_container.h
index 615657b0..111fafbf 100644
--- a/python/google/protobuf/pyext/map_container.h
+++ b/python/google/protobuf/pyext/map_container.h
@@ -34,27 +34,18 @@
 #include <Python.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
+#include <google/protobuf/pyext/message.h>
 
 namespace google {
 namespace protobuf {
 
 class Message;
 
-#ifdef _SHARED_PTR_H
-using std::shared_ptr;
-#else
-using internal::shared_ptr;
-#endif
-
 namespace python {
 
-struct CMessage;
 struct CMessageClass;
 
 // This struct is used directly for ScalarMap, and is the base class of
@@ -66,7 +57,7 @@ struct MapContainer {
   // proto tree.  Every Python MapContainer holds a
   // reference to it in order to keep it alive as long as there's a
   // Python object that references any part of the tree.
-  shared_ptr<Message> owner;
+  CMessage::OwnerRef owner;
 
   // Pointer to the C++ Message that contains this container.  The
   // MapContainer does not own this pointer.
@@ -99,9 +90,7 @@ struct MapContainer {
   int Release();
 
   // Set the owner field of self and any children of self.
-  void SetOwner(const shared_ptr<Message>& new_owner) {
-    owner = new_owner;
-  }
+  void SetOwner(const CMessage::OwnerRef& new_owner) { owner = new_owner; }
 };
 
 struct MessageMapContainer : public MapContainer {
diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
index c810b788..53736b9c 100644
--- a/python/google/protobuf/pyext/message.cc
+++ b/python/google/protobuf/pyext/message.cc
@@ -35,9 +35,6 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 #include <structmember.h>  // A Python header file.
@@ -52,6 +49,7 @@
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
 #include <google/protobuf/util/message_differencer.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
@@ -66,7 +64,6 @@
 #include <google/protobuf/pyext/message_factory.h>
 #include <google/protobuf/pyext/safe_numerics.h>
 #include <google/protobuf/pyext/scoped_pyobject_ptr.h>
-#include <google/protobuf/stubs/strutil.h>
 
 #if PY_MAJOR_VERSION >= 3
   #define PyInt_AsLong PyLong_AsLong
@@ -101,6 +98,17 @@ namespace message_meta {
 
 static int InsertEmptyWeakref(PyTypeObject* base);
 
+namespace {
+// Copied oveer from internal 'google/protobuf/stubs/strutil.h'.
+inline void UpperString(string * s) {
+  string::iterator end = s->end();
+  for (string::iterator i = s->begin(); i != end; ++i) {
+    // toupper() changes based on locale.  We don't want this!
+    if ('a' <= *i && *i <= 'z') *i += 'A' - 'a';
+  }
+}
+}
+
 // Add the number of a field descriptor to the containing message class.
 // Equivalent to:
 //   _cls.<field>_FIELD_NUMBER = <number>
@@ -594,7 +602,7 @@ void OutOfRangeError(PyObject* arg) {
 
 template<class RangeType, class ValueType>
 bool VerifyIntegerCastAndRange(PyObject* arg, ValueType value) {
-  if GOOGLE_PREDICT_FALSE(value == -1 && PyErr_Occurred()) {
+  if (GOOGLE_PREDICT_FALSE(value == -1 && PyErr_Occurred())) {
     if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
       // Replace it with the same ValueError as pure python protos instead of
       // the default one.
@@ -602,11 +610,11 @@ bool VerifyIntegerCastAndRange(PyObject* arg, ValueType value) {
       OutOfRangeError(arg);
     }  // Otherwise propagate existing error.
     return false;
-  }
-  if GOOGLE_PREDICT_FALSE(!IsValidNumericCast<RangeType>(value)) {
-    OutOfRangeError(arg);
-    return false;
-  }
+    }
+    if (GOOGLE_PREDICT_FALSE(!IsValidNumericCast<RangeType>(value))) {
+      OutOfRangeError(arg);
+      return false;
+    }
   return true;
 }
 
@@ -615,25 +623,25 @@ bool CheckAndGetInteger(PyObject* arg, T* value) {
   // The fast path.
 #if PY_MAJOR_VERSION < 3
   // For the typical case, offer a fast path.
-  if GOOGLE_PREDICT_TRUE(PyInt_Check(arg)) {
-    long int_result =  PyInt_AsLong(arg);
-    if GOOGLE_PREDICT_TRUE(IsValidNumericCast<T>(int_result)) {
+  if (GOOGLE_PREDICT_TRUE(PyInt_Check(arg))) {
+    long int_result = PyInt_AsLong(arg);
+    if (GOOGLE_PREDICT_TRUE(IsValidNumericCast<T>(int_result))) {
       *value = static_cast<T>(int_result);
       return true;
     } else {
       OutOfRangeError(arg);
       return false;
     }
-  }
+    }
 #endif
   // This effectively defines an integer as "an object that can be cast as
   // an integer and can be used as an ordinal number".
   // This definition includes everything that implements numbers.Integral
   // and shouldn't cast the net too wide.
-  if GOOGLE_PREDICT_FALSE(!PyIndex_Check(arg)) {
-    FormatTypeError(arg, "int, long");
-    return false;
-  }
+    if (GOOGLE_PREDICT_FALSE(!PyIndex_Check(arg))) {
+      FormatTypeError(arg, "int, long");
+      return false;
+    }
 
   // Now we have an integral number so we can safely use PyLong_ functions.
   // We need to treat the signed and unsigned cases differently in case arg is
@@ -647,10 +655,10 @@ bool CheckAndGetInteger(PyObject* arg, T* value) {
       // Unlike PyLong_AsLongLong, PyLong_AsUnsignedLongLong is very
       // picky about the exact type.
       PyObject* casted = PyNumber_Long(arg);
-      if GOOGLE_PREDICT_FALSE(casted == NULL) {
+      if (GOOGLE_PREDICT_FALSE(casted == nullptr)) {
         // Propagate existing error.
         return false;
-      }
+        }
       ulong_result = PyLong_AsUnsignedLongLong(casted);
       Py_DECREF(casted);
     }
@@ -672,10 +680,10 @@ bool CheckAndGetInteger(PyObject* arg, T* value) {
       // Valid subclasses of numbers.Integral should have a __long__() method
       // so fall back to that.
       PyObject* casted = PyNumber_Long(arg);
-      if GOOGLE_PREDICT_FALSE(casted == NULL) {
+      if (GOOGLE_PREDICT_FALSE(casted == nullptr)) {
         // Propagate existing error.
         return false;
-      }
+        }
       long_result = PyLong_AsLongLong(casted);
       Py_DECREF(casted);
     }
@@ -698,10 +706,10 @@ template bool CheckAndGetInteger<uint64>(PyObject*, uint64*);
 
 bool CheckAndGetDouble(PyObject* arg, double* value) {
   *value = PyFloat_AsDouble(arg);
-  if GOOGLE_PREDICT_FALSE(*value == -1 && PyErr_Occurred()) {
+  if (GOOGLE_PREDICT_FALSE(*value == -1 && PyErr_Occurred())) {
     FormatTypeError(arg, "int, long, float");
     return false;
-  }
+    }
   return true;
 }
 
@@ -779,7 +787,7 @@ PyObject* CheckString(PyObject* arg, const FieldDescriptor* descriptor) {
       encoded_string = arg;  // Already encoded.
       Py_INCREF(encoded_string);
     } else {
-      encoded_string = PyUnicode_AsEncodedObject(arg, "utf-8", NULL);
+      encoded_string = PyUnicode_AsEncodedString(arg, "utf-8", NULL);
     }
   } else {
     // In this case field type is "bytes".
@@ -819,7 +827,8 @@ bool CheckAndSetString(
   return true;
 }
 
-PyObject* ToStringObject(const FieldDescriptor* descriptor, string value) {
+PyObject* ToStringObject(const FieldDescriptor* descriptor,
+                         const string& value) {
   if (descriptor->type() != FieldDescriptor::TYPE_STRING) {
     return PyBytes_FromStringAndSize(value.c_str(), value.length());
   }
@@ -1055,13 +1064,15 @@ int InternalDeleteRepeatedField(
 
   if (PySlice_Check(slice)) {
     from = to = step = slice_length = 0;
-    PySlice_GetIndicesEx(
 #if PY_MAJOR_VERSION < 3
+    PySlice_GetIndicesEx(
         reinterpret_cast<PySliceObject*>(slice),
+        length, &from, &to, &step, &slice_length);
 #else
+    PySlice_GetIndicesEx(
         slice,
-#endif
         length, &from, &to, &step, &slice_length);
+#endif
     if (from < to) {
       min = from;
       max = to - 1;
@@ -1165,7 +1176,7 @@ int InitAttributes(CMessage* self, PyObject* args, PyObject* kwargs) {
       continue;
     }
     if (descriptor->is_map()) {
-      ScopedPyObjectPtr map(GetAttr(self, name));
+      ScopedPyObjectPtr map(GetAttr(reinterpret_cast<PyObject*>(self), name));
       const FieldDescriptor* value_descriptor =
           descriptor->message_type()->FindFieldByName("value");
       if (value_descriptor->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
@@ -1193,7 +1204,8 @@ int InitAttributes(CMessage* self, PyObject* args, PyObject* kwargs) {
         }
       }
     } else if (descriptor->label() == FieldDescriptor::LABEL_REPEATED) {
-      ScopedPyObjectPtr container(GetAttr(self, name));
+      ScopedPyObjectPtr container(
+          GetAttr(reinterpret_cast<PyObject*>(self), name));
       if (container == NULL) {
         return -1;
       }
@@ -1260,7 +1272,8 @@ int InitAttributes(CMessage* self, PyObject* args, PyObject* kwargs) {
         }
       }
     } else if (descriptor->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
-      ScopedPyObjectPtr message(GetAttr(self, name));
+      ScopedPyObjectPtr message(
+          GetAttr(reinterpret_cast<PyObject*>(self), name));
       if (message == NULL) {
         return -1;
       }
@@ -1285,8 +1298,8 @@ int InitAttributes(CMessage* self, PyObject* args, PyObject* kwargs) {
           return -1;
         }
       }
-      if (SetAttr(self, name, (new_val.get() == NULL) ? value : new_val.get()) <
-          0) {
+      if (SetAttr(reinterpret_cast<PyObject*>(self), name,
+                  (new_val.get() == NULL) ? value : new_val.get()) < 0) {
         return -1;
       }
     }
@@ -1303,6 +1316,8 @@ CMessage* NewEmptyMessage(CMessageClass* type) {
     return NULL;
   }
 
+  // Use "placement new" syntax to initialize the C++ object.
+  new (&self->owner) CMessage::OwnerRef(NULL);
   self->message = NULL;
   self->parent = NULL;
   self->parent_field_descriptor = NULL;
@@ -1399,7 +1414,7 @@ static void Dealloc(CMessage* self) {
 
   Py_CLEAR(self->extensions);
   Py_CLEAR(self->composite_fields);
-  self->owner.reset();
+  self->owner.~ThreadUnsafeSharedPtr<Message>();
   Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
 }
 
@@ -1540,20 +1555,7 @@ PyObject* HasField(CMessage* self, PyObject* arg) {
   if (message->GetReflection()->HasField(*message, field_descriptor)) {
     Py_RETURN_TRUE;
   }
-  if (!message->GetReflection()->SupportsUnknownEnumValues() &&
-      field_descriptor->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
-    // Special case: Python HasField() differs in semantics from C++
-    // slightly: we return HasField('enum_field') == true if there is
-    // an unknown enum value present. To implement this we have to
-    // look in the UnknownFieldSet.
-    const UnknownFieldSet& unknown_field_set =
-        message->GetReflection()->GetUnknownFields(*message);
-    for (int i = 0; i < unknown_field_set.field_count(); ++i) {
-      if (unknown_field_set.field(i).number() == field_descriptor->number()) {
-        Py_RETURN_TRUE;
-      }
-    }
-  }
+
   Py_RETURN_FALSE;
 }
 
@@ -1614,9 +1616,10 @@ PyObject* HasExtension(CMessage* self, PyObject* extension) {
 // * Clear the weak references from the released container to the
 //   parent.
 
-struct SetOwnerVisitor : public ChildVisitor {
+class SetOwnerVisitor : public ChildVisitor {
+ public:
   // new_owner must outlive this object.
-  explicit SetOwnerVisitor(const shared_ptr<Message>& new_owner)
+  explicit SetOwnerVisitor(const CMessage::OwnerRef& new_owner)
       : new_owner_(new_owner) {}
 
   int VisitRepeatedCompositeContainer(RepeatedCompositeContainer* container) {
@@ -1640,11 +1643,11 @@ struct SetOwnerVisitor : public ChildVisitor {
   }
 
  private:
-  const shared_ptr<Message>& new_owner_;
+  const CMessage::OwnerRef& new_owner_;
 };
 
 // Change the owner of this CMessage and all its children, recursively.
-int SetOwner(CMessage* self, const shared_ptr<Message>& new_owner) {
+int SetOwner(CMessage* self, const CMessage::OwnerRef& new_owner) {
   self->owner = new_owner;
   if (ForEachCompositeField(self, SetOwnerVisitor(new_owner)) == -1)
     return -1;
@@ -1677,7 +1680,7 @@ int ReleaseSubMessage(CMessage* self,
                       const FieldDescriptor* field_descriptor,
                       CMessage* child_cmessage) {
   // Release the Message
-  shared_ptr<Message> released_message(ReleaseMessage(
+  CMessage::OwnerRef released_message(ReleaseMessage(
       self, child_cmessage->message->GetDescriptor(), field_descriptor));
   child_cmessage->message = released_message.get();
   child_cmessage->owner.swap(released_message);
@@ -1732,12 +1735,6 @@ PyObject* ClearFieldByDescriptor(
   AssureWritable(self);
   Message* message = self->message;
   message->GetReflection()->ClearField(message, field_descriptor);
-  if (field_descriptor->cpp_type() == FieldDescriptor::CPPTYPE_ENUM &&
-      !message->GetReflection()->SupportsUnknownEnumValues()) {
-    UnknownFieldSet* unknown_field_set =
-        message->GetReflection()->MutableUnknownFields(message);
-    unknown_field_set->DeleteByNumber(field_descriptor->number());
-  }
   Py_RETURN_NONE;
 }
 
@@ -1808,8 +1805,25 @@ static string GetMessageName(CMessage* self) {
   }
 }
 
-static PyObject* SerializeToString(CMessage* self, PyObject* args) {
-  if (!self->message->IsInitialized()) {
+static PyObject* InternalSerializeToString(
+    CMessage* self, PyObject* args, PyObject* kwargs,
+    bool require_initialized) {
+  // Parse the "deterministic" kwarg; defaults to False.
+  static char* kwlist[] = { "deterministic", 0 };
+  PyObject* deterministic_obj = Py_None;
+  if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O", kwlist,
+                                   &deterministic_obj)) {
+    return NULL;
+  }
+  // Preemptively convert to a bool first, so we don't need to back out of
+  // allocating memory if this raises an exception.
+  // NOTE: This is unused later if deterministic == Py_None, but that's fine.
+  int deterministic = PyObject_IsTrue(deterministic_obj);
+  if (deterministic < 0) {
+    return NULL;
+  }
+
+  if (require_initialized && !self->message->IsInitialized()) {
     ScopedPyObjectPtr errors(FindInitializationErrors(self));
     if (errors == NULL) {
       return NULL;
@@ -1847,24 +1861,36 @@ static PyObject* SerializeToString(CMessage* self, PyObject* args) {
                  GetMessageName(self).c_str(), PyString_AsString(joined.get()));
     return NULL;
   }
-  int size = self->message->ByteSize();
-  if (size <= 0) {
+
+  // Ok, arguments parsed and errors checked, now encode to a string
+  const size_t size = self->message->ByteSizeLong();
+  if (size == 0) {
     return PyBytes_FromString("");
   }
   PyObject* result = PyBytes_FromStringAndSize(NULL, size);
   if (result == NULL) {
     return NULL;
   }
-  char* buffer = PyBytes_AS_STRING(result);
-  self->message->SerializeWithCachedSizesToArray(
-      reinterpret_cast<uint8*>(buffer));
+  io::ArrayOutputStream out(PyBytes_AS_STRING(result), size);
+  io::CodedOutputStream coded_out(&out);
+  if (deterministic_obj != Py_None) {
+    coded_out.SetSerializationDeterministic(deterministic);
+  }
+  self->message->SerializeWithCachedSizes(&coded_out);
+  GOOGLE_CHECK(!coded_out.HadError());
   return result;
 }
 
-static PyObject* SerializePartialToString(CMessage* self) {
-  string contents;
-  self->message->SerializePartialToString(&contents);
-  return PyBytes_FromStringAndSize(contents.c_str(), contents.size());
+static PyObject* SerializeToString(
+    CMessage* self, PyObject* args, PyObject* kwargs) {
+  return InternalSerializeToString(self, args, kwargs,
+                                   /*require_initialized=*/true);
+}
+
+static PyObject* SerializePartialToString(
+    CMessage* self, PyObject* args, PyObject* kwargs) {
+  return InternalSerializeToString(self, args, kwargs,
+                                   /*require_initialized=*/false);
 }
 
 // Formats proto fields for ascii dumps using python formatting functions where
@@ -2033,6 +2059,11 @@ static PyObject* MergeFromString(CMessage* self, PyObject* arg) {
   input.SetExtensionRegistry(factory->pool->pool, factory->message_factory);
   bool success = self->message->MergePartialFromCodedStream(&input);
   if (success) {
+    if (!input.ConsumedEntireMessage()) {
+      // TODO(jieluo): Raise error and return NULL instead.
+      // b/27494216
+      PyErr_Warn(NULL, "Unexpected end-group tag: Not all data was converted");
+    }
     return PyInt_FromLong(input.CurrentPosition());
   } else {
     PyErr_Format(DecodeError_class, "Error parsing message");
@@ -2174,7 +2205,8 @@ static PyObject* ListFields(CMessage* self) {
         return NULL;
       }
 
-      PyObject* field_value = GetAttr(self, py_field_name.get());
+      PyObject* field_value =
+          GetAttr(reinterpret_cast<PyObject*>(self), py_field_name.get());
       if (field_value == NULL) {
         PyErr_SetObject(PyExc_ValueError, py_field_name.get());
         return NULL;
@@ -2298,32 +2330,16 @@ PyObject* InternalGetScalar(const Message* message,
       break;
     }
     case FieldDescriptor::CPPTYPE_STRING: {
-      string value = reflection->GetString(*message, field_descriptor);
+      string scratch;
+      const string& value =
+          reflection->GetStringReference(*message, field_descriptor, &scratch);
       result = ToStringObject(field_descriptor, value);
       break;
     }
     case FieldDescriptor::CPPTYPE_ENUM: {
-      if (!message->GetReflection()->SupportsUnknownEnumValues() &&
-          !message->GetReflection()->HasField(*message, field_descriptor)) {
-        // Look for the value in the unknown fields.
-        const UnknownFieldSet& unknown_field_set =
-            message->GetReflection()->GetUnknownFields(*message);
-        for (int i = 0; i < unknown_field_set.field_count(); ++i) {
-          if (unknown_field_set.field(i).number() ==
-              field_descriptor->number() &&
-              unknown_field_set.field(i).type() ==
-              google::protobuf::UnknownField::TYPE_VARINT) {
-            result = PyInt_FromLong(unknown_field_set.field(i).varint());
-            break;
-          }
-        }
-      }
-
-      if (result == NULL) {
-        const EnumValueDescriptor* enum_value =
-            message->GetReflection()->GetEnum(*message, field_descriptor);
-        result = PyInt_FromLong(enum_value->number());
-      }
+      const EnumValueDescriptor* enum_value =
+          message->GetReflection()->GetEnum(*message, field_descriptor);
+      result = PyInt_FromLong(enum_value->number());
       break;
     }
     default:
@@ -2535,7 +2551,10 @@ PyObject* Reduce(CMessage* self) {
   if (state == NULL) {
     return  NULL;
   }
-  ScopedPyObjectPtr serialized(SerializePartialToString(self));
+  string contents;
+  self->message->SerializePartialToString(&contents);
+  ScopedPyObjectPtr serialized(
+      PyBytes_FromStringAndSize(contents.c_str(), contents.size()));
   if (serialized == NULL) {
     return NULL;
   }
@@ -2656,9 +2675,10 @@ static PyMethodDef Methods[] = {
   { "RegisterExtension", (PyCFunction)RegisterExtension, METH_O | METH_CLASS,
     "Registers an extension with the current message." },
   { "SerializePartialToString", (PyCFunction)SerializePartialToString,
-    METH_NOARGS,
+    METH_VARARGS | METH_KEYWORDS,
     "Serializes the message to a string, even if it isn't initialized." },
-  { "SerializeToString", (PyCFunction)SerializeToString, METH_NOARGS,
+  { "SerializeToString", (PyCFunction)SerializeToString,
+    METH_VARARGS | METH_KEYWORDS,
     "Serializes the message to a string, only for initialized messages." },
   { "SetInParent", (PyCFunction)SetInParent, METH_NOARGS,
     "Sets the has bit of the given field in its parent message." },
@@ -2684,7 +2704,8 @@ static bool SetCompositeField(
   return PyDict_SetItem(self->composite_fields, name, value) == 0;
 }
 
-PyObject* GetAttr(CMessage* self, PyObject* name) {
+PyObject* GetAttr(PyObject* pself, PyObject* name) {
+  CMessage* self = reinterpret_cast<CMessage*>(pself);
   PyObject* value = self->composite_fields ?
       PyDict_GetItem(self->composite_fields, name) : NULL;
   if (value != NULL) {
@@ -2762,7 +2783,8 @@ PyObject* GetAttr(CMessage* self, PyObject* name) {
   return InternalGetScalar(self->message, field_descriptor);
 }
 
-int SetAttr(CMessage* self, PyObject* name, PyObject* value) {
+int SetAttr(PyObject* pself, PyObject* name, PyObject* value) {
+  CMessage* self = reinterpret_cast<CMessage*>(pself);
   if (self->composite_fields && PyDict_Contains(self->composite_fields, name)) {
     PyErr_SetString(PyExc_TypeError, "Can't set composite field");
     return -1;
@@ -2814,8 +2836,8 @@ PyTypeObject CMessage_Type = {
   PyObject_HashNotImplemented,         //  tp_hash
   0,                                   //  tp_call
   (reprfunc)cmessage::ToStr,           //  tp_str
-  (getattrofunc)cmessage::GetAttr,     //  tp_getattro
-  (setattrofunc)cmessage::SetAttr,     //  tp_setattro
+  cmessage::GetAttr,                   //  tp_getattro
+  cmessage::SetAttr,                   //  tp_setattro
   0,                                   //  tp_as_buffer
   Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,  //  tp_flags
   "A ProtocolMessage",                 //  tp_doc
@@ -2844,17 +2866,38 @@ const Message* (*GetCProtoInsidePyProtoPtr)(PyObject* msg);
 Message* (*MutableCProtoInsidePyProtoPtr)(PyObject* msg);
 
 static const Message* GetCProtoInsidePyProtoImpl(PyObject* msg) {
+  const Message* message = PyMessage_GetMessagePointer(msg);
+  if (message == NULL) {
+    PyErr_Clear();
+    return NULL;
+  }
+  return message;
+}
+
+static Message* MutableCProtoInsidePyProtoImpl(PyObject* msg) {
+  Message* message = PyMessage_GetMutableMessagePointer(msg);
+  if (message == NULL) {
+    PyErr_Clear();
+    return NULL;
+  }
+  return message;
+}
+
+const Message* PyMessage_GetMessagePointer(PyObject* msg) {
   if (!PyObject_TypeCheck(msg, &CMessage_Type)) {
+    PyErr_SetString(PyExc_TypeError, "Not a Message instance");
     return NULL;
   }
   CMessage* cmsg = reinterpret_cast<CMessage*>(msg);
   return cmsg->message;
 }
 
-static Message* MutableCProtoInsidePyProtoImpl(PyObject* msg) {
+Message* PyMessage_GetMutableMessagePointer(PyObject* msg) {
   if (!PyObject_TypeCheck(msg, &CMessage_Type)) {
+    PyErr_SetString(PyExc_TypeError, "Not a Message instance");
     return NULL;
   }
+
   CMessage* cmsg = reinterpret_cast<CMessage*>(msg);
   if ((cmsg->composite_fields && PyDict_Size(cmsg->composite_fields) != 0) ||
       (cmsg->extensions != NULL &&
@@ -2863,6 +2906,9 @@ static Message* MutableCProtoInsidePyProtoImpl(PyObject* msg) {
     // the underlying C++ message back to the CMessage (e.g. removed repeated
     // composite containers). We only allow direct mutation of the underlying
     // C++ message if there is no child data in the CMessage.
+    PyErr_SetString(PyExc_ValueError,
+                    "Cannot reliably get a mutable pointer "
+                    "to a message with extra references");
     return NULL;
   }
   cmessage::AssureWritable(cmsg);
@@ -3041,5 +3087,4 @@ bool InitProto2MessageModule(PyObject *m) {
 
 }  // namespace python
 }  // namespace protobuf
-
 }  // namespace google
diff --git a/python/google/protobuf/pyext/message.h b/python/google/protobuf/pyext/message.h
index ce80497e..d754e62a 100644
--- a/python/google/protobuf/pyext/message.h
+++ b/python/google/protobuf/pyext/message.h
@@ -37,11 +37,11 @@
 #include <Python.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/pyext/thread_unsafe_shared_ptr.h>
+
 namespace google {
 namespace protobuf {
 
@@ -52,13 +52,6 @@ class Descriptor;
 class DescriptorPool;
 class MessageFactory;
 
-#ifdef _SHARED_PTR_H
-using std::shared_ptr;
-using std::string;
-#else
-using internal::shared_ptr;
-#endif
-
 namespace python {
 
 struct ExtensionDict;
@@ -71,7 +64,9 @@ typedef struct CMessage {
   // proto tree.  Every Python CMessage holds a reference to it in
   // order to keep it alive as long as there's a Python object that
   // references any part of the tree.
-  shared_ptr<Message> owner;
+
+  typedef ThreadUnsafeSharedPtr<Message> OwnerRef;
+  OwnerRef owner;
 
   // Weak reference to a parent CMessage object. This is NULL for any top-level
   // message and is set for any child message (i.e. a child submessage or a
@@ -240,22 +235,22 @@ PyObject* MergeFrom(CMessage* self, PyObject* arg);
 // has been registered with the same field number on this class.
 PyObject* RegisterExtension(PyObject* cls, PyObject* extension_handle);
 
-// Retrieves an attribute named 'name' from CMessage 'self'. Returns
-// the attribute value on success, or NULL on failure.
+// Retrieves an attribute named 'name' from 'self', which is interpreted as a
+// CMessage. Returns the attribute value on success, or null on failure.
 //
 // Returns a new reference.
-PyObject* GetAttr(CMessage* self, PyObject* name);
+PyObject* GetAttr(PyObject* self, PyObject* name);
 
-// Set the value of the attribute named 'name', for CMessage 'self',
-// to the value 'value'. Returns -1 on failure.
-int SetAttr(CMessage* self, PyObject* name, PyObject* value);
+// Set the value of the attribute named 'name', for 'self', which is interpreted
+// as a CMessage, to the value 'value'. Returns -1 on failure.
+int SetAttr(PyObject* self, PyObject* name, PyObject* value);
 
 PyObject* FindInitializationErrors(CMessage* self);
 
 // Set the owner field of self and any children of self, recursively.
 // Used when self is being released and thus has a new owner (the
 // released Message.)
-int SetOwner(CMessage* self, const shared_ptr<Message>& new_owner);
+int SetOwner(CMessage* self, const CMessage::OwnerRef& new_owner);
 
 int AssureWritable(CMessage* self);
 
@@ -336,7 +331,8 @@ bool CheckAndSetString(
     const Reflection* reflection,
     bool append,
     int index);
-PyObject* ToStringObject(const FieldDescriptor* descriptor, string value);
+PyObject* ToStringObject(const FieldDescriptor* descriptor,
+                         const string& value);
 
 // Check if the passed field descriptor belongs to the given message.
 // If not, return false and set a Python exception (a KeyError)
@@ -345,8 +341,20 @@ bool CheckFieldBelongsToMessage(const FieldDescriptor* field_descriptor,
 
 extern PyObject* PickleError_class;
 
+const Message* PyMessage_GetMessagePointer(PyObject* msg);
+Message* PyMessage_GetMutableMessagePointer(PyObject* msg);
+
 bool InitProto2MessageModule(PyObject *m);
 
+#if LANG_CXX11
+// These are referenced by repeated_scalar_container, and must
+// be explicitly instantiated.
+extern template bool CheckAndGetInteger<int32>(PyObject*, int32*);
+extern template bool CheckAndGetInteger<int64>(PyObject*, int64*);
+extern template bool CheckAndGetInteger<uint32>(PyObject*, uint32*);
+extern template bool CheckAndGetInteger<uint64>(PyObject*, uint64*);
+#endif
+
 }  // namespace python
 }  // namespace protobuf
 
diff --git a/python/google/protobuf/pyext/message_factory.cc b/python/google/protobuf/pyext/message_factory.cc
index e0b45bf2..bacc76a6 100644
--- a/python/google/protobuf/pyext/message_factory.cc
+++ b/python/google/protobuf/pyext/message_factory.cc
@@ -100,7 +100,9 @@ PyObject* New(PyTypeObject* type, PyObject* args, PyObject* kwargs) {
       NewMessageFactory(type, reinterpret_cast<PyDescriptorPool*>(pool)));
 }
 
-static void Dealloc(PyMessageFactory* self) {
+static void Dealloc(PyObject* pself) {
+  PyMessageFactory* self = reinterpret_cast<PyMessageFactory*>(pself);
+
   // TODO(amauryfa): When the MessageFactory is not created from the
   // DescriptorPool this reference should be owned, not borrowed.
   // Py_CLEAR(self->pool);
@@ -111,7 +113,7 @@ static void Dealloc(PyMessageFactory* self) {
   }
   delete self->classes_by_descriptor;
   delete self->message_factory;
-  Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
+  Py_TYPE(self)->tp_free(pself);
 }
 
 // Add a message class to our database.
@@ -133,11 +135,7 @@ int RegisterMessageClass(PyMessageFactory* self,
 CMessageClass* GetOrCreateMessageClass(PyMessageFactory* self,
                                        const Descriptor* descriptor) {
   // This is the same implementation as MessageFactory.GetPrototype().
-  ScopedPyObjectPtr py_descriptor(
-      PyMessageDescriptor_FromDescriptor(descriptor));
-  if (py_descriptor == NULL) {
-    return NULL;
-  }
+
   // Do not create a MessageClass that already exists.
   hash_map<const Descriptor*, CMessageClass*>::iterator it =
       self->classes_by_descriptor->find(descriptor);
@@ -145,6 +143,11 @@ CMessageClass* GetOrCreateMessageClass(PyMessageFactory* self,
     Py_INCREF(it->second);
     return it->second;
   }
+  ScopedPyObjectPtr py_descriptor(
+      PyMessageDescriptor_FromDescriptor(descriptor));
+  if (py_descriptor == NULL) {
+    return NULL;
+  }
   // Create a new message class.
   ScopedPyObjectPtr args(Py_BuildValue(
       "s(){sOsOsO}", descriptor->name().c_str(),
@@ -230,7 +233,7 @@ PyTypeObject PyMessageFactory_Type = {
     ".MessageFactory",                        // tp_name
     sizeof(PyMessageFactory),                 // tp_basicsize
     0,                                        // tp_itemsize
-    (destructor)message_factory::Dealloc,     // tp_dealloc
+    message_factory::Dealloc,                 // tp_dealloc
     0,                                        // tp_print
     0,                                        // tp_getattr
     0,                                        // tp_setattr
diff --git a/python/google/protobuf/pyext/message_module.cc b/python/google/protobuf/pyext/message_module.cc
index d90d9de3..f5c8f295 100644
--- a/python/google/protobuf/pyext/message_module.cc
+++ b/python/google/protobuf/pyext/message_module.cc
@@ -28,7 +28,49 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include <Python.h>
+
 #include <google/protobuf/pyext/message.h>
+#include <google/protobuf/proto_api.h>
+
+#include <google/protobuf/message_lite.h>
+
+namespace {
+
+// C++ API.  Clients get at this via proto_api.h
+struct ApiImplementation : google::protobuf::python::PyProto_API {
+  const google::protobuf::Message*
+      GetMessagePointer(PyObject* msg) const override {
+    return google::protobuf::python::PyMessage_GetMessagePointer(msg);
+  }
+  google::protobuf::Message*
+      GetMutableMessagePointer(PyObject* msg) const override {
+    return google::protobuf::python::PyMessage_GetMutableMessagePointer(msg);
+  }
+};
+
+}  // namespace
+
+static PyObject* GetPythonProto3PreserveUnknownsDefault(
+    PyObject* /*m*/, PyObject* /*args*/) {
+  if (google::protobuf::internal::GetProto3PreserveUnknownsDefault()) {
+    Py_RETURN_TRUE;
+  } else {
+    Py_RETURN_FALSE;
+  }
+}
+
+static PyObject* SetPythonProto3PreserveUnknownsDefault(
+    PyObject* /*m*/, PyObject* arg) {
+  if (!arg || !PyBool_Check(arg)) {
+    PyErr_SetString(
+        PyExc_TypeError,
+        "Argument to SetPythonProto3PreserveUnknownsDefault must be boolean");
+    return NULL;
+  }
+  google::protobuf::internal::SetProto3PreserveUnknownsDefault(PyObject_IsTrue(arg));
+  Py_RETURN_NONE;
+}
 
 static const char module_docstring[] =
 "python-proto2 is a module that can be used to enhance proto2 Python API\n"
@@ -41,6 +83,14 @@ static PyMethodDef ModuleMethods[] = {
   {"SetAllowOversizeProtos",
     (PyCFunction)google::protobuf::python::cmessage::SetAllowOversizeProtos,
     METH_O, "Enable/disable oversize proto parsing."},
+  // DO NOT USE: For migration and testing only.
+  {"GetPythonProto3PreserveUnknownsDefault",
+    (PyCFunction)GetPythonProto3PreserveUnknownsDefault,
+    METH_NOARGS, "Get Proto3 preserve unknowns default."},
+  // DO NOT USE: For migration and testing only.
+  {"SetPythonProto3PreserveUnknownsDefault",
+    (PyCFunction)SetPythonProto3PreserveUnknownsDefault,
+    METH_O, "Enable/disable proto3 unknowns preservation."},
   { NULL, NULL}
 };
 
diff --git a/python/google/protobuf/pyext/python.proto b/python/google/protobuf/pyext/python.proto
index cce645d7..2e50df74 100644
--- a/python/google/protobuf/pyext/python.proto
+++ b/python/google/protobuf/pyext/python.proto
@@ -58,11 +58,11 @@ message ForeignMessage {
   repeated int32 d = 2;
 }
 
-message TestAllExtensions {
+message TestAllExtensions {  // extension begin
   extensions 1 to max;
-}
+}  // extension end
 
-extend TestAllExtensions {
+extend TestAllExtensions {  // extension begin
   optional TestAllTypes.NestedMessage optional_nested_message_extension = 1;
   repeated TestAllTypes.NestedMessage repeated_nested_message_extension = 2;
-}
+}  // extension end
diff --git a/python/google/protobuf/pyext/repeated_composite_container.cc b/python/google/protobuf/pyext/repeated_composite_container.cc
index 43a2bc12..5874d5de 100644
--- a/python/google/protobuf/pyext/repeated_composite_container.cc
+++ b/python/google/protobuf/pyext/repeated_composite_container.cc
@@ -34,9 +34,6 @@
 #include <google/protobuf/pyext/repeated_composite_container.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -46,7 +43,9 @@
 #include <google/protobuf/pyext/descriptor.h>
 #include <google/protobuf/pyext/descriptor_pool.h>
 #include <google/protobuf/pyext/message.h>
+#include <google/protobuf/pyext/message_factory.h>
 #include <google/protobuf/pyext/scoped_pyobject_ptr.h>
+#include <google/protobuf/reflection.h>
 
 #if PY_MAJOR_VERSION >= 3
   #define PyInt_Check PyLong_Check
@@ -79,7 +78,10 @@ namespace repeated_composite_container {
 // ---------------------------------------------------------------------
 // len()
 
-static Py_ssize_t Length(RepeatedCompositeContainer* self) {
+static Py_ssize_t Length(PyObject* pself) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   Message* message = self->message;
   if (message != NULL) {
     return message->GetReflection()->FieldSize(*message,
@@ -100,7 +102,7 @@ static int UpdateChildMessages(RepeatedCompositeContainer* self) {
   // A MergeFrom on a parent message could have caused extra messages to be
   // added in the underlying protobuf so add them to our list. They can never
   // be removed in such a way so there's no need to worry about that.
-  Py_ssize_t message_length = Length(self);
+  Py_ssize_t message_length = Length(reinterpret_cast<PyObject*>(self));
   Py_ssize_t child_length = PyList_GET_SIZE(self->child_messages);
   Message* message = self->message;
   const Reflection* reflection = message->GetReflection();
@@ -136,9 +138,12 @@ static PyObject* AddToAttached(RepeatedCompositeContainer* self,
   if (cmessage::AssureWritable(self->parent) == -1)
     return NULL;
   Message* message = self->message;
+
   Message* sub_message =
-      message->GetReflection()->AddMessage(message,
-                                           self->parent_field_descriptor);
+      message->GetReflection()->AddMessage(
+          message,
+          self->parent_field_descriptor,
+          self->child_message_class->py_message_factory->message_factory);
   CMessage* cmsg = cmessage::NewEmptyMessage(self->child_message_class);
   if (cmsg == NULL)
     return NULL;
@@ -186,6 +191,10 @@ PyObject* Add(RepeatedCompositeContainer* self,
     return AddToAttached(self, args, kwargs);
 }
 
+static PyObject* AddMethod(PyObject* self, PyObject* args, PyObject* kwargs) {
+  return Add(reinterpret_cast<RepeatedCompositeContainer*>(self), args, kwargs);
+}
+
 // ---------------------------------------------------------------------
 // extend()
 
@@ -221,6 +230,10 @@ PyObject* Extend(RepeatedCompositeContainer* self, PyObject* value) {
   Py_RETURN_NONE;
 }
 
+static PyObject* ExtendMethod(PyObject* self, PyObject* value) {
+  return Extend(reinterpret_cast<RepeatedCompositeContainer*>(self), value);
+}
+
 PyObject* MergeFrom(RepeatedCompositeContainer* self, PyObject* other) {
   if (UpdateChildMessages(self) < 0) {
     return NULL;
@@ -228,6 +241,10 @@ PyObject* MergeFrom(RepeatedCompositeContainer* self, PyObject* other) {
   return Extend(self, other);
 }
 
+static PyObject* MergeFromMethod(PyObject* self, PyObject* other) {
+  return MergeFrom(reinterpret_cast<RepeatedCompositeContainer*>(self), other);
+}
+
 PyObject* Subscript(RepeatedCompositeContainer* self, PyObject* slice) {
   if (UpdateChildMessages(self) < 0) {
     return NULL;
@@ -237,6 +254,10 @@ PyObject* Subscript(RepeatedCompositeContainer* self, PyObject* slice) {
   return PyObject_GetItem(self->child_messages, slice);
 }
 
+static PyObject* SubscriptMethod(PyObject* self, PyObject* slice) {
+  return Subscript(reinterpret_cast<RepeatedCompositeContainer*>(self), slice);
+}
+
 int AssignSubscript(RepeatedCompositeContainer* self,
                     PyObject* slice,
                     PyObject* value) {
@@ -260,15 +281,16 @@ int AssignSubscript(RepeatedCompositeContainer* self,
     Py_ssize_t from;
     Py_ssize_t to;
     Py_ssize_t step;
-    Py_ssize_t length = Length(self);
+    Py_ssize_t length = Length(reinterpret_cast<PyObject*>(self));
     Py_ssize_t slicelength;
     if (PySlice_Check(slice)) {
 #if PY_MAJOR_VERSION >= 3
       if (PySlice_GetIndicesEx(slice,
+                               length, &from, &to, &step, &slicelength) == -1) {
 #else
       if (PySlice_GetIndicesEx(reinterpret_cast<PySliceObject*>(slice),
-#endif
                                length, &from, &to, &step, &slicelength) == -1) {
+#endif
         return -1;
       }
       return PySequence_DelSlice(self->child_messages, from, to);
@@ -284,7 +306,16 @@ int AssignSubscript(RepeatedCompositeContainer* self,
   return 0;
 }
 
-static PyObject* Remove(RepeatedCompositeContainer* self, PyObject* value) {
+static int AssignSubscriptMethod(PyObject* self, PyObject* slice,
+                                 PyObject* value) {
+  return AssignSubscript(reinterpret_cast<RepeatedCompositeContainer*>(self),
+                         slice, value);
+}
+
+static PyObject* Remove(PyObject* pself, PyObject* value) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   if (UpdateChildMessages(self) < 0) {
     return NULL;
   }
@@ -299,9 +330,10 @@ static PyObject* Remove(RepeatedCompositeContainer* self, PyObject* value) {
   Py_RETURN_NONE;
 }
 
-static PyObject* RichCompare(RepeatedCompositeContainer* self,
-                             PyObject* other,
-                             int opid) {
+static PyObject* RichCompare(PyObject* pself, PyObject* other, int opid) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   if (UpdateChildMessages(self) < 0) {
     return NULL;
   }
@@ -334,6 +366,19 @@ static PyObject* RichCompare(RepeatedCompositeContainer* self,
   }
 }
 
+static PyObject* ToStr(PyObject* pself) {
+  ScopedPyObjectPtr full_slice(PySlice_New(NULL, NULL, NULL));
+  if (full_slice == NULL) {
+    return NULL;
+  }
+  ScopedPyObjectPtr list(Subscript(
+      reinterpret_cast<RepeatedCompositeContainer*>(pself), full_slice.get()));
+  if (list == NULL) {
+    return NULL;
+  }
+  return PyObject_Repr(list.get());
+}
+
 // ---------------------------------------------------------------------
 // sort()
 
@@ -341,7 +386,7 @@ static void ReorderAttached(RepeatedCompositeContainer* self) {
   Message* message = self->message;
   const Reflection* reflection = message->GetReflection();
   const FieldDescriptor* descriptor = self->parent_field_descriptor;
-  const Py_ssize_t length = Length(self);
+  const Py_ssize_t length = Length(reinterpret_cast<PyObject*>(self));
 
   // Since Python protobuf objects are never arena-allocated, adding and
   // removing message pointers to the underlying array is just updating
@@ -372,9 +417,10 @@ static int SortPythonMessages(RepeatedCompositeContainer* self,
   return 0;
 }
 
-static PyObject* Sort(RepeatedCompositeContainer* self,
-                      PyObject* args,
-                      PyObject* kwds) {
+static PyObject* Sort(PyObject* pself, PyObject* args, PyObject* kwds) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   // Support the old sort_function argument for backwards
   // compatibility.
   if (kwds != NULL) {
@@ -398,11 +444,14 @@ static PyObject* Sort(RepeatedCompositeContainer* self,
 
 // ---------------------------------------------------------------------
 
-static PyObject* Item(RepeatedCompositeContainer* self, Py_ssize_t index) {
+static PyObject* Item(PyObject* pself, Py_ssize_t index) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   if (UpdateChildMessages(self) < 0) {
     return NULL;
   }
-  Py_ssize_t length = Length(self);
+  Py_ssize_t length = Length(pself);
   if (index < 0) {
     index = length + index;
   }
@@ -414,17 +463,17 @@ static PyObject* Item(RepeatedCompositeContainer* self, Py_ssize_t index) {
   return item;
 }
 
-static PyObject* Pop(RepeatedCompositeContainer* self,
-                     PyObject* args) {
+static PyObject* Pop(PyObject* pself, PyObject* args) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   Py_ssize_t index = -1;
   if (!PyArg_ParseTuple(args, "|n", &index)) {
     return NULL;
   }
-  PyObject* item = Item(self, index);
+  PyObject* item = Item(pself, index);
   if (item == NULL) {
-    PyErr_Format(PyExc_IndexError,
-                 "list index (%zd) out of range",
-                 index);
+    PyErr_Format(PyExc_IndexError, "list index (%zd) out of range", index);
     return NULL;
   }
   ScopedPyObjectPtr py_index(PyLong_FromSsize_t(index));
@@ -442,7 +491,7 @@ void ReleaseLastTo(CMessage* parent,
   GOOGLE_CHECK_NOTNULL(field);
   GOOGLE_CHECK_NOTNULL(target);
 
-  shared_ptr<Message> released_message(
+  CMessage::OwnerRef released_message(
       parent->message->GetReflection()->ReleaseLast(parent->message, field));
   // TODO(tibell): Deal with proto1.
 
@@ -485,8 +534,37 @@ int Release(RepeatedCompositeContainer* self) {
   return 0;
 }
 
+PyObject* DeepCopy(PyObject* pself, PyObject* arg) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
+  ScopedPyObjectPtr cloneObj(
+      PyType_GenericAlloc(&RepeatedCompositeContainer_Type, 0));
+  if (cloneObj == NULL) {
+    return NULL;
+  }
+  RepeatedCompositeContainer* clone =
+      reinterpret_cast<RepeatedCompositeContainer*>(cloneObj.get());
+
+  Message* new_message = self->message->New();
+  clone->parent = NULL;
+  clone->parent_field_descriptor = self->parent_field_descriptor;
+  clone->message = new_message;
+  clone->owner.reset(new_message);
+  Py_INCREF(self->child_message_class);
+  clone->child_message_class = self->child_message_class;
+  clone->child_messages = PyList_New(0);
+
+  new_message->GetReflection()
+      ->GetMutableRepeatedFieldRef<Message>(new_message,
+                                            self->parent_field_descriptor)
+      .MergeFrom(self->message->GetReflection()->GetRepeatedFieldRef<Message>(
+          *self->message, self->parent_field_descriptor));
+  return cloneObj.release();
+}
+
 int SetOwner(RepeatedCompositeContainer* self,
-             const shared_ptr<Message>& new_owner) {
+             const CMessage::OwnerRef& new_owner) {
   GOOGLE_CHECK_ATTACHED(self);
 
   self->owner = new_owner;
@@ -527,41 +605,46 @@ PyObject *NewContainer(
   return reinterpret_cast<PyObject*>(self);
 }
 
-static void Dealloc(RepeatedCompositeContainer* self) {
+static void Dealloc(PyObject* pself) {
+  RepeatedCompositeContainer* self =
+      reinterpret_cast<RepeatedCompositeContainer*>(pself);
+
   Py_CLEAR(self->child_messages);
   Py_CLEAR(self->child_message_class);
   // TODO(tibell): Do we need to call delete on these objects to make
   // sure their destructors are called?
   self->owner.reset();
 
-  Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
+  Py_TYPE(self)->tp_free(pself);
 }
 
 static PySequenceMethods SqMethods = {
-  (lenfunc)Length,        /* sq_length */
-  0, /* sq_concat */
-  0, /* sq_repeat */
-  (ssizeargfunc)Item /* sq_item */
+  Length,                 /* sq_length */
+  0,                      /* sq_concat */
+  0,                      /* sq_repeat */
+  Item                    /* sq_item */
 };
 
 static PyMappingMethods MpMethods = {
-  (lenfunc)Length,               /* mp_length */
-  (binaryfunc)Subscript,      /* mp_subscript */
-  (objobjargproc)AssignSubscript,/* mp_ass_subscript */
+  Length,                 /* mp_length */
+  SubscriptMethod,        /* mp_subscript */
+  AssignSubscriptMethod,  /* mp_ass_subscript */
 };
 
 static PyMethodDef Methods[] = {
-  { "add", (PyCFunction) Add, METH_VARARGS | METH_KEYWORDS,
+  { "__deepcopy__", DeepCopy, METH_VARARGS,
+    "Makes a deep copy of the class." },
+  { "add", (PyCFunction)AddMethod, METH_VARARGS | METH_KEYWORDS,
     "Adds an object to the repeated container." },
-  { "extend", (PyCFunction) Extend, METH_O,
+  { "extend", ExtendMethod, METH_O,
     "Adds objects to the repeated container." },
-  { "pop", (PyCFunction)Pop, METH_VARARGS,
+  { "pop", Pop, METH_VARARGS,
     "Removes an object from the repeated container and returns it." },
-  { "remove", (PyCFunction) Remove, METH_O,
+  { "remove", Remove, METH_O,
     "Removes an object from the repeated container." },
-  { "sort", (PyCFunction) Sort, METH_VARARGS | METH_KEYWORDS,
+  { "sort", (PyCFunction)Sort, METH_VARARGS | METH_KEYWORDS,
     "Sorts the repeated container." },
-  { "MergeFrom", (PyCFunction) MergeFrom, METH_O,
+  { "MergeFrom", MergeFromMethod, METH_O,
     "Adds objects to the repeated container." },
   { NULL, NULL }
 };
@@ -573,12 +656,12 @@ PyTypeObject RepeatedCompositeContainer_Type = {
   FULL_MODULE_NAME ".RepeatedCompositeContainer",  // tp_name
   sizeof(RepeatedCompositeContainer),  // tp_basicsize
   0,                                   //  tp_itemsize
-  (destructor)repeated_composite_container::Dealloc,  //  tp_dealloc
+  repeated_composite_container::Dealloc,  //  tp_dealloc
   0,                                   //  tp_print
   0,                                   //  tp_getattr
   0,                                   //  tp_setattr
   0,                                   //  tp_compare
-  0,                                   //  tp_repr
+  repeated_composite_container::ToStr,      //  tp_repr
   0,                                   //  tp_as_number
   &repeated_composite_container::SqMethods,   //  tp_as_sequence
   &repeated_composite_container::MpMethods,   //  tp_as_mapping
@@ -592,7 +675,7 @@ PyTypeObject RepeatedCompositeContainer_Type = {
   "A Repeated scalar container",       //  tp_doc
   0,                                   //  tp_traverse
   0,                                   //  tp_clear
-  (richcmpfunc)repeated_composite_container::RichCompare,  //  tp_richcompare
+  repeated_composite_container::RichCompare,  //  tp_richcompare
   0,                                   //  tp_weaklistoffset
   0,                                   //  tp_iter
   0,                                   //  tp_iternext
diff --git a/python/google/protobuf/pyext/repeated_composite_container.h b/python/google/protobuf/pyext/repeated_composite_container.h
index a7b56b61..e5e946aa 100644
--- a/python/google/protobuf/pyext/repeated_composite_container.h
+++ b/python/google/protobuf/pyext/repeated_composite_container.h
@@ -37,27 +37,19 @@
 #include <Python.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 
+#include <google/protobuf/pyext/message.h>
+
 namespace google {
 namespace protobuf {
 
 class FieldDescriptor;
 class Message;
 
-#ifdef _SHARED_PTR_H
-using std::shared_ptr;
-#else
-using internal::shared_ptr;
-#endif
-
 namespace python {
 
-struct CMessage;
 struct CMessageClass;
 
 // A RepeatedCompositeContainer can be in one of two states: attached
@@ -77,7 +69,7 @@ typedef struct RepeatedCompositeContainer {
   // proto tree.  Every Python RepeatedCompositeContainer holds a
   // reference to it in order to keep it alive as long as there's a
   // Python object that references any part of the tree.
-  shared_ptr<Message> owner;
+  CMessage::OwnerRef owner;
 
   // Weak reference to parent object. May be NULL. Used to make sure
   // the parent is writable before modifying the
@@ -148,11 +140,6 @@ int AssignSubscript(RepeatedCompositeContainer* self,
                     PyObject* slice,
                     PyObject* value);
 
-// Releases the messages in the container to the given message.
-//
-// Returns 0 on success, -1 on failure.
-int ReleaseToMessage(RepeatedCompositeContainer* self, Message* new_message);
-
 // Releases the messages in the container to a new message.
 //
 // Returns 0 on success, -1 on failure.
@@ -160,7 +147,7 @@ int Release(RepeatedCompositeContainer* self);
 
 // Returns 0 on success, -1 on failure.
 int SetOwner(RepeatedCompositeContainer* self,
-             const shared_ptr<Message>& new_owner);
+             const CMessage::OwnerRef& new_owner);
 
 // Removes the last element of the repeated message field 'field' on
 // the Message 'parent', and transfers the ownership of the released
diff --git a/python/google/protobuf/pyext/repeated_scalar_container.cc b/python/google/protobuf/pyext/repeated_scalar_container.cc
index 95da85f8..de3b6e14 100644
--- a/python/google/protobuf/pyext/repeated_scalar_container.cc
+++ b/python/google/protobuf/pyext/repeated_scalar_container.cc
@@ -34,9 +34,6 @@
 #include <google/protobuf/pyext/repeated_scalar_container.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
@@ -77,15 +74,18 @@ static int InternalAssignRepeatedField(
   return 0;
 }
 
-static Py_ssize_t Len(RepeatedScalarContainer* self) {
+static Py_ssize_t Len(PyObject* pself) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
   Message* message = self->message;
   return message->GetReflection()->FieldSize(*message,
                                              self->parent_field_descriptor);
 }
 
-static int AssignItem(RepeatedScalarContainer* self,
-                      Py_ssize_t index,
-                      PyObject* arg) {
+static int AssignItem(PyObject* pself, Py_ssize_t index, PyObject* arg) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
+
   cmessage::AssureWritable(self->parent);
   Message* message = self->message;
   const FieldDescriptor* field_descriptor = self->parent_field_descriptor;
@@ -188,7 +188,10 @@ static int AssignItem(RepeatedScalarContainer* self,
   return 0;
 }
 
-static PyObject* Item(RepeatedScalarContainer* self, Py_ssize_t index) {
+static PyObject* Item(PyObject* pself, Py_ssize_t index) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
+
   Message* message = self->message;
   const FieldDescriptor* field_descriptor = self->parent_field_descriptor;
   const Reflection* reflection = message->GetReflection();
@@ -256,27 +259,12 @@ static PyObject* Item(RepeatedScalarContainer* self, Py_ssize_t index) {
       break;
     }
     case FieldDescriptor::CPPTYPE_STRING: {
-      string value = reflection->GetRepeatedString(
-          *message, field_descriptor, index);
+      string scratch;
+      const string& value = reflection->GetRepeatedStringReference(
+          *message, field_descriptor, index, &scratch);
       result = ToStringObject(field_descriptor, value);
       break;
     }
-    case FieldDescriptor::CPPTYPE_MESSAGE: {
-      PyObject* py_cmsg = PyObject_CallObject(reinterpret_cast<PyObject*>(
-          &CMessage_Type), NULL);
-      if (py_cmsg == NULL) {
-        return NULL;
-      }
-      CMessage* cmsg = reinterpret_cast<CMessage*>(py_cmsg);
-      const Message& msg = reflection->GetRepeatedMessage(
-          *message, field_descriptor, index);
-      cmsg->owner = self->owner;
-      cmsg->parent = self->parent;
-      cmsg->message = const_cast<Message*>(&msg);
-      cmsg->read_only = false;
-      result = reinterpret_cast<PyObject*>(py_cmsg);
-      break;
-    }
     default:
       PyErr_Format(
           PyExc_SystemError,
@@ -287,7 +275,7 @@ static PyObject* Item(RepeatedScalarContainer* self, Py_ssize_t index) {
   return result;
 }
 
-static PyObject* Subscript(RepeatedScalarContainer* self, PyObject* slice) {
+static PyObject* Subscript(PyObject* pself, PyObject* slice) {
   Py_ssize_t from;
   Py_ssize_t to;
   Py_ssize_t step;
@@ -302,13 +290,14 @@ static PyObject* Subscript(RepeatedScalarContainer* self, PyObject* slice) {
   if (PyLong_Check(slice)) {
     from = to = PyLong_AsLong(slice);
   } else if (PySlice_Check(slice)) {
-    length = Len(self);
+    length = Len(pself);
 #if PY_MAJOR_VERSION >= 3
     if (PySlice_GetIndicesEx(slice,
+                             length, &from, &to, &step, &slicelength) == -1) {
 #else
     if (PySlice_GetIndicesEx(reinterpret_cast<PySliceObject*>(slice),
-#endif
                              length, &from, &to, &step, &slicelength) == -1) {
+#endif
       return NULL;
     }
     return_list = true;
@@ -318,7 +307,7 @@ static PyObject* Subscript(RepeatedScalarContainer* self, PyObject* slice) {
   }
 
   if (!return_list) {
-    return Item(self, from);
+    return Item(pself, from);
   }
 
   PyObject* list = PyList_New(0);
@@ -333,7 +322,7 @@ static PyObject* Subscript(RepeatedScalarContainer* self, PyObject* slice) {
       if (index < 0 || index >= length) {
         break;
       }
-      ScopedPyObjectPtr s(Item(self, index));
+      ScopedPyObjectPtr s(Item(pself, index));
       PyList_Append(list, s.get());
     }
   } else {
@@ -344,7 +333,7 @@ static PyObject* Subscript(RepeatedScalarContainer* self, PyObject* slice) {
       if (index < 0 || index >= length) {
         break;
       }
-      ScopedPyObjectPtr s(Item(self, index));
+      ScopedPyObjectPtr s(Item(pself, index));
       PyList_Append(list, s.get());
     }
   }
@@ -431,9 +420,14 @@ PyObject* Append(RepeatedScalarContainer* self, PyObject* item) {
   Py_RETURN_NONE;
 }
 
-static int AssSubscript(RepeatedScalarContainer* self,
-                        PyObject* slice,
-                        PyObject* value) {
+static PyObject* AppendMethod(PyObject* self, PyObject* item) {
+  return Append(reinterpret_cast<RepeatedScalarContainer*>(self), item);
+}
+
+static int AssSubscript(PyObject* pself, PyObject* slice, PyObject* value) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
+
   Py_ssize_t from;
   Py_ssize_t to;
   Py_ssize_t step;
@@ -449,7 +443,7 @@ static int AssSubscript(RepeatedScalarContainer* self,
 #if PY_MAJOR_VERSION < 3
   if (PyInt_Check(slice)) {
     from = to = PyInt_AsLong(slice);
-  } else
+  } else  // NOLINT
 #endif
   if (PyLong_Check(slice)) {
     from = to = PyLong_AsLong(slice);
@@ -458,10 +452,11 @@ static int AssSubscript(RepeatedScalarContainer* self,
     length = reflection->FieldSize(*message, field_descriptor);
 #if PY_MAJOR_VERSION >= 3
     if (PySlice_GetIndicesEx(slice,
+                             length, &from, &to, &step, &slicelength) == -1) {
 #else
     if (PySlice_GetIndicesEx(reinterpret_cast<PySliceObject*>(slice),
-#endif
                              length, &from, &to, &step, &slicelength) == -1) {
+#endif
       return -1;
     }
     create_list = true;
@@ -476,14 +471,14 @@ static int AssSubscript(RepeatedScalarContainer* self,
   }
 
   if (!create_list) {
-    return AssignItem(self, from, value);
+    return AssignItem(pself, from, value);
   }
 
   ScopedPyObjectPtr full_slice(PySlice_New(NULL, NULL, NULL));
   if (full_slice == NULL) {
     return -1;
   }
-  ScopedPyObjectPtr new_list(Subscript(self, full_slice.get()));
+  ScopedPyObjectPtr new_list(Subscript(pself, full_slice.get()));
   if (new_list == NULL) {
     return -1;
   }
@@ -522,14 +517,17 @@ PyObject* Extend(RepeatedScalarContainer* self, PyObject* value) {
   Py_RETURN_NONE;
 }
 
-static PyObject* Insert(RepeatedScalarContainer* self, PyObject* args) {
+static PyObject* Insert(PyObject* pself, PyObject* args) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
+
   Py_ssize_t index;
   PyObject* value;
   if (!PyArg_ParseTuple(args, "lO", &index, &value)) {
     return NULL;
   }
   ScopedPyObjectPtr full_slice(PySlice_New(NULL, NULL, NULL));
-  ScopedPyObjectPtr new_list(Subscript(self, full_slice.get()));
+  ScopedPyObjectPtr new_list(Subscript(pself, full_slice.get()));
   if (PyList_Insert(new_list.get(), index, value) < 0) {
     return NULL;
   }
@@ -540,10 +538,10 @@ static PyObject* Insert(RepeatedScalarContainer* self, PyObject* args) {
   Py_RETURN_NONE;
 }
 
-static PyObject* Remove(RepeatedScalarContainer* self, PyObject* value) {
+static PyObject* Remove(PyObject* pself, PyObject* value) {
   Py_ssize_t match_index = -1;
-  for (Py_ssize_t i = 0; i < Len(self); ++i) {
-    ScopedPyObjectPtr elem(Item(self, i));
+  for (Py_ssize_t i = 0; i < Len(pself); ++i) {
+    ScopedPyObjectPtr elem(Item(pself, i));
     if (PyObject_RichCompareBool(elem.get(), value, Py_EQ)) {
       match_index = i;
       break;
@@ -553,15 +551,17 @@ static PyObject* Remove(RepeatedScalarContainer* self, PyObject* value) {
     PyErr_SetString(PyExc_ValueError, "remove(x): x not in container");
     return NULL;
   }
-  if (AssignItem(self, match_index, NULL) < 0) {
+  if (AssignItem(pself, match_index, NULL) < 0) {
     return NULL;
   }
   Py_RETURN_NONE;
 }
 
-static PyObject* RichCompare(RepeatedScalarContainer* self,
-                             PyObject* other,
-                             int opid) {
+static PyObject* ExtendMethod(PyObject* self, PyObject* value) {
+  return Extend(reinterpret_cast<RepeatedScalarContainer*>(self), value);
+}
+
+static PyObject* RichCompare(PyObject* pself, PyObject* other, int opid) {
   if (opid != Py_EQ && opid != Py_NE) {
     Py_INCREF(Py_NotImplemented);
     return Py_NotImplemented;
@@ -578,28 +578,25 @@ static PyObject* RichCompare(RepeatedScalarContainer* self,
 
   ScopedPyObjectPtr other_list_deleter;
   if (PyObject_TypeCheck(other, &RepeatedScalarContainer_Type)) {
-    other_list_deleter.reset(Subscript(
-        reinterpret_cast<RepeatedScalarContainer*>(other), full_slice.get()));
+    other_list_deleter.reset(Subscript(other, full_slice.get()));
     other = other_list_deleter.get();
   }
 
-  ScopedPyObjectPtr list(Subscript(self, full_slice.get()));
+  ScopedPyObjectPtr list(Subscript(pself, full_slice.get()));
   if (list == NULL) {
     return NULL;
   }
   return PyObject_RichCompare(list.get(), other, opid);
 }
 
-PyObject* Reduce(RepeatedScalarContainer* unused_self) {
+PyObject* Reduce(PyObject* unused_self, PyObject* unused_other) {
   PyErr_Format(
       PickleError_class,
       "can't pickle repeated message fields, convert to list first");
   return NULL;
 }
 
-static PyObject* Sort(RepeatedScalarContainer* self,
-                      PyObject* args,
-                      PyObject* kwds) {
+static PyObject* Sort(PyObject* pself, PyObject* args, PyObject* kwds) {
   // Support the old sort_function argument for backwards
   // compatibility.
   if (kwds != NULL) {
@@ -618,7 +615,7 @@ static PyObject* Sort(RepeatedScalarContainer* self,
   if (full_slice == NULL) {
     return NULL;
   }
-  ScopedPyObjectPtr list(Subscript(self, full_slice.get()));
+  ScopedPyObjectPtr list(Subscript(pself, full_slice.get()));
   if (list == NULL) {
     return NULL;
   }
@@ -630,32 +627,42 @@ static PyObject* Sort(RepeatedScalarContainer* self,
   if (res == NULL) {
     return NULL;
   }
-  int ret = InternalAssignRepeatedField(self, list.get());
+  int ret = InternalAssignRepeatedField(
+      reinterpret_cast<RepeatedScalarContainer*>(pself), list.get());
   if (ret < 0) {
     return NULL;
   }
   Py_RETURN_NONE;
 }
 
-static PyObject* Pop(RepeatedScalarContainer* self,
-                     PyObject* args) {
+static PyObject* Pop(PyObject* pself, PyObject* args) {
   Py_ssize_t index = -1;
   if (!PyArg_ParseTuple(args, "|n", &index)) {
     return NULL;
   }
-  PyObject* item = Item(self, index);
+  PyObject* item = Item(pself, index);
   if (item == NULL) {
-    PyErr_Format(PyExc_IndexError,
-                 "list index (%zd) out of range",
-                 index);
+    PyErr_Format(PyExc_IndexError, "list index (%zd) out of range", index);
     return NULL;
   }
-  if (AssignItem(self, index, NULL) < 0) {
+  if (AssignItem(pself, index, NULL) < 0) {
     return NULL;
   }
   return item;
 }
 
+static PyObject* ToStr(PyObject* pself) {
+  ScopedPyObjectPtr full_slice(PySlice_New(NULL, NULL, NULL));
+  if (full_slice == NULL) {
+    return NULL;
+  }
+  ScopedPyObjectPtr list(Subscript(pself, full_slice.get()));
+  if (list == NULL) {
+    return NULL;
+  }
+  return PyObject_Repr(list.get());
+}
+
 // The private constructor of RepeatedScalarContainer objects.
 PyObject *NewContainer(
     CMessage* parent, const FieldDescriptor* parent_field_descriptor) {
@@ -688,7 +695,8 @@ static int InitializeAndCopyToParentContainer(
   if (full_slice == NULL) {
     return -1;
   }
-  ScopedPyObjectPtr values(Subscript(from, full_slice.get()));
+  ScopedPyObjectPtr values(
+      Subscript(reinterpret_cast<PyObject*>(from), full_slice.get()));
   if (values == NULL) {
     return -1;
   }
@@ -707,7 +715,10 @@ int Release(RepeatedScalarContainer* self) {
   return InitializeAndCopyToParentContainer(self, self);
 }
 
-PyObject* DeepCopy(RepeatedScalarContainer* self, PyObject* arg) {
+PyObject* DeepCopy(PyObject* pself, PyObject* arg) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
+
   RepeatedScalarContainer* clone = reinterpret_cast<RepeatedScalarContainer*>(
       PyType_GenericAlloc(&RepeatedScalarContainer_Type, 0));
   if (clone == NULL) {
@@ -721,45 +732,47 @@ PyObject* DeepCopy(RepeatedScalarContainer* self, PyObject* arg) {
   return reinterpret_cast<PyObject*>(clone);
 }
 
-static void Dealloc(RepeatedScalarContainer* self) {
+static void Dealloc(PyObject* pself) {
+  RepeatedScalarContainer* self =
+      reinterpret_cast<RepeatedScalarContainer*>(pself);
   self->owner.reset();
-  Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
+  Py_TYPE(self)->tp_free(pself);
 }
 
 void SetOwner(RepeatedScalarContainer* self,
-              const shared_ptr<Message>& new_owner) {
+              const CMessage::OwnerRef& new_owner) {
   self->owner = new_owner;
 }
 
 static PySequenceMethods SqMethods = {
-  (lenfunc)Len,           /* sq_length */
-  0, /* sq_concat */
-  0, /* sq_repeat */
-  (ssizeargfunc)Item, /* sq_item */
-  0, /* sq_slice */
-  (ssizeobjargproc)AssignItem /* sq_ass_item */
+  Len,        /* sq_length */
+  0,          /* sq_concat */
+  0,          /* sq_repeat */
+  Item,       /* sq_item */
+  0,          /* sq_slice */
+  AssignItem  /* sq_ass_item */
 };
 
 static PyMappingMethods MpMethods = {
-  (lenfunc)Len,               /* mp_length */
-  (binaryfunc)Subscript,      /* mp_subscript */
-  (objobjargproc)AssSubscript, /* mp_ass_subscript */
+  Len,               /* mp_length */
+  Subscript,      /* mp_subscript */
+  AssSubscript, /* mp_ass_subscript */
 };
 
 static PyMethodDef Methods[] = {
-  { "__deepcopy__", (PyCFunction)DeepCopy, METH_VARARGS,
+  { "__deepcopy__", DeepCopy, METH_VARARGS,
     "Makes a deep copy of the class." },
-  { "__reduce__", (PyCFunction)Reduce, METH_NOARGS,
+  { "__reduce__", Reduce, METH_NOARGS,
     "Outputs picklable representation of the repeated field." },
-  { "append", (PyCFunction)Append, METH_O,
+  { "append", AppendMethod, METH_O,
     "Appends an object to the repeated container." },
-  { "extend", (PyCFunction)Extend, METH_O,
-    "Appends objects to the repeated container." },
-  { "insert", (PyCFunction)Insert, METH_VARARGS,
+  { "extend", ExtendMethod, METH_O,
     "Appends objects to the repeated container." },
-  { "pop", (PyCFunction)Pop, METH_VARARGS,
+  { "insert", Insert, METH_VARARGS,
+    "Inserts an object at the specified position in the container." },
+  { "pop", Pop, METH_VARARGS,
     "Removes an object from the repeated container and returns it." },
-  { "remove", (PyCFunction)Remove, METH_O,
+  { "remove", Remove, METH_O,
     "Removes an object from the repeated container." },
   { "sort", (PyCFunction)Sort, METH_VARARGS | METH_KEYWORDS,
     "Sorts the repeated container."},
@@ -773,12 +786,12 @@ PyTypeObject RepeatedScalarContainer_Type = {
   FULL_MODULE_NAME ".RepeatedScalarContainer",  // tp_name
   sizeof(RepeatedScalarContainer),     // tp_basicsize
   0,                                   //  tp_itemsize
-  (destructor)repeated_scalar_container::Dealloc,  //  tp_dealloc
+  repeated_scalar_container::Dealloc,  //  tp_dealloc
   0,                                   //  tp_print
   0,                                   //  tp_getattr
   0,                                   //  tp_setattr
   0,                                   //  tp_compare
-  0,                                   //  tp_repr
+  repeated_scalar_container::ToStr,    //  tp_repr
   0,                                   //  tp_as_number
   &repeated_scalar_container::SqMethods,   //  tp_as_sequence
   &repeated_scalar_container::MpMethods,   //  tp_as_mapping
@@ -792,7 +805,7 @@ PyTypeObject RepeatedScalarContainer_Type = {
   "A Repeated scalar container",       //  tp_doc
   0,                                   //  tp_traverse
   0,                                   //  tp_clear
-  (richcmpfunc)repeated_scalar_container::RichCompare,  //  tp_richcompare
+  repeated_scalar_container::RichCompare,  //  tp_richcompare
   0,                                   //  tp_weaklistoffset
   0,                                   //  tp_iter
   0,                                   //  tp_iternext
diff --git a/python/google/protobuf/pyext/repeated_scalar_container.h b/python/google/protobuf/pyext/repeated_scalar_container.h
index 555e621c..559dec98 100644
--- a/python/google/protobuf/pyext/repeated_scalar_container.h
+++ b/python/google/protobuf/pyext/repeated_scalar_container.h
@@ -37,27 +37,14 @@
 #include <Python.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/descriptor.h>
+#include <google/protobuf/pyext/message.h>
 
 namespace google {
 namespace protobuf {
-
-class Message;
-
-#ifdef _SHARED_PTR_H
-using std::shared_ptr;
-#else
-using internal::shared_ptr;
-#endif
-
 namespace python {
 
-struct CMessage;
-
 typedef struct RepeatedScalarContainer {
   PyObject_HEAD;
 
@@ -65,7 +52,7 @@ typedef struct RepeatedScalarContainer {
   // proto tree.  Every Python RepeatedScalarContainer holds a
   // reference to it in order to keep it alive as long as there's a
   // Python object that references any part of the tree.
-  shared_ptr<Message> owner;
+  CMessage::OwnerRef owner;
 
   // Pointer to the C++ Message that contains this container.  The
   // RepeatedScalarContainer does not own this pointer.
@@ -112,7 +99,7 @@ PyObject* Extend(RepeatedScalarContainer* self, PyObject* value);
 
 // Set the owner field of self and any children of self.
 void SetOwner(RepeatedScalarContainer* self,
-              const shared_ptr<Message>& new_owner);
+              const CMessage::OwnerRef& new_owner);
 
 }  // namespace repeated_scalar_container
 }  // namespace python
diff --git a/python/google/protobuf/pyext/scoped_pyobject_ptr.h b/python/google/protobuf/pyext/scoped_pyobject_ptr.h
index a128cd4c..a2afa7f1 100644
--- a/python/google/protobuf/pyext/scoped_pyobject_ptr.h
+++ b/python/google/protobuf/pyext/scoped_pyobject_ptr.h
@@ -36,61 +36,70 @@
 #include <google/protobuf/stubs/common.h>
 
 #include <Python.h>
-
 namespace google {
-class ScopedPyObjectPtr {
+namespace protobuf {
+namespace python {
+
+// Owns a python object and decrements the reference count on destruction.
+// This class is not threadsafe.
+template <typename PyObjectStruct>
+class ScopedPythonPtr {
  public:
-  // Constructor.  Defaults to initializing with NULL.
-  // There is no way to create an uninitialized ScopedPyObjectPtr.
-  explicit ScopedPyObjectPtr(PyObject* p = NULL) : ptr_(p) { }
+  // Takes the ownership of the specified object to ScopedPythonPtr.
+  // The reference count of the specified py_object is not incremented.
+  explicit ScopedPythonPtr(PyObjectStruct* py_object = NULL)
+      : ptr_(py_object) {}
 
-  // Destructor.  If there is a PyObject object, delete it.
-  ~ScopedPyObjectPtr() {
-    Py_XDECREF(ptr_);
-  }
+  // If a PyObject is owned, decrement its reference count.
+  ~ScopedPythonPtr() { Py_XDECREF(ptr_); }
 
-  // Reset.  Deletes the current owned object, if any.
-  // Then takes ownership of a new object, if given.
+  // Deletes the current owned object, if any.
+  // Then takes ownership of a new object without incrementing the reference
+  // count.
   // This function must be called with a reference that you own.
   //   this->reset(this->get()) is wrong!
   //   this->reset(this->release()) is OK.
-  PyObject* reset(PyObject* p = NULL) {
+  PyObjectStruct* reset(PyObjectStruct* p = NULL) {
     Py_XDECREF(ptr_);
     ptr_ = p;
     return ptr_;
   }
 
-  // Releases ownership of the object.
+  // Releases ownership of the object without decrementing the reference count.
   // The caller now owns the returned reference.
-  PyObject* release() {
+  PyObjectStruct* release() {
     PyObject* p = ptr_;
     ptr_ = NULL;
     return p;
   }
 
-  PyObject* operator->() const  {
+  PyObjectStruct* operator->() const {
     assert(ptr_ != NULL);
     return ptr_;
   }
 
-  PyObject* get() const { return ptr_; }
+  PyObjectStruct* get() const { return ptr_; }
 
-  Py_ssize_t refcnt() const { return Py_REFCNT(ptr_); }
+  PyObject* as_pyobject() const { return reinterpret_cast<PyObject*>(ptr_); }
 
+  // Increments the reference count fo the current object.
+  // Should not be called when no object is held.
   void inc() const { Py_INCREF(ptr_); }
 
-  // Comparison operators.
-  // These return whether a ScopedPyObjectPtr and a raw pointer
-  // refer to the same object, not just to two different but equal
-  // objects.
-  bool operator==(const PyObject* p) const { return ptr_ == p; }
-  bool operator!=(const PyObject* p) const { return ptr_ != p; }
+  // True when a ScopedPyObjectPtr and a raw pointer refer to the same object.
+  // Comparison operators are non reflexive.
+  bool operator==(const PyObjectStruct* p) const { return ptr_ == p; }
+  bool operator!=(const PyObjectStruct* p) const { return ptr_ != p; }
 
  private:
-  PyObject* ptr_;
+  PyObjectStruct* ptr_;
 
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ScopedPyObjectPtr);
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ScopedPythonPtr);
 };
 
+typedef ScopedPythonPtr<PyObject> ScopedPyObjectPtr;
+
+}  // namespace python
+}  // namespace protobuf
 }  // namespace google
 #endif  // GOOGLE_PROTOBUF_PYTHON_CPP_SCOPED_PYOBJECT_PTR_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_file.h b/python/google/protobuf/pyext/thread_unsafe_shared_ptr.h
index 217eafe2..ad804b5f 100644
--- a/src/google/protobuf/compiler/javanano/javanano_file.h
+++ b/python/google/protobuf/pyext/thread_unsafe_shared_ptr.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,67 +28,77 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
+// ThreadUnsafeSharedPtr<T> is the same as shared_ptr<T> without the locking
+// overhread (and thread-safety).
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_THREAD_UNSAFE_SHARED_PTR_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_THREAD_UNSAFE_SHARED_PTR_H__
 
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__
+#include <algorithm>
+#include <utility>
 
-#include <string>
-#include <vector>
+#include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
 
 namespace google {
 namespace protobuf {
-  class FileDescriptor;        // descriptor.h
-  namespace io {
-    class Printer;             // printer.h
-  }
-  namespace compiler {
-    class GeneratorContext;     // code_generator.h
+namespace python {
+
+template <typename T>
+class ThreadUnsafeSharedPtr {
+ public:
+  // Takes ownership.
+  explicit ThreadUnsafeSharedPtr(T* ptr)
+      : ptr_(ptr), refcount_(ptr ? new RefcountT(1) : nullptr) {
   }
-}
 
-namespace protobuf {
-namespace compiler {
-namespace javanano {
+  ThreadUnsafeSharedPtr(const ThreadUnsafeSharedPtr& other)
+      : ThreadUnsafeSharedPtr(nullptr) {
+    *this = other;
+  }
 
-class FileGenerator {
- public:
-  explicit FileGenerator(const FileDescriptor* file, const Params& params);
-  ~FileGenerator();
+  ThreadUnsafeSharedPtr& operator=(const ThreadUnsafeSharedPtr& other) {
+    if (other.refcount_ == refcount_) {
+      return *this;
+    }
+    this->~ThreadUnsafeSharedPtr();
+    ptr_ = other.ptr_;
+    refcount_ = other.refcount_;
+    if (refcount_) {
+      ++*refcount_;
+    }
+    return *this;
+  }
 
-  // Checks for problems that would otherwise lead to cryptic compile errors.
-  // Returns true if there are no problems, or writes an error description to
-  // the given string and returns false otherwise.
-  bool Validate(string* error);
+  ~ThreadUnsafeSharedPtr() {
+    if (refcount_ == nullptr) {
+      GOOGLE_DCHECK(ptr_ == nullptr);
+      return;
+    }
+    if (--*refcount_ == 0) {
+      delete refcount_;
+      delete ptr_;
+    }
+  }
 
-  void Generate(io::Printer* printer);
+  void reset(T* ptr = nullptr) { *this = ThreadUnsafeSharedPtr(ptr); }
 
-  // If we aren't putting everything into one file, this will write all the
-  // files other than the outer file (i.e. one for each message, enum, and
-  // service type).
-  void GenerateSiblings(const string& package_dir,
-                        GeneratorContext* output_directory,
-                        vector<string>* file_list);
+  T* get() { return ptr_; }
+  const T* get() const { return ptr_; }
 
-  const string& java_package() { return java_package_; }
-  const string& classname()    { return classname_;    }
+  void swap(ThreadUnsafeSharedPtr& other) {
+    using std::swap;
+    swap(ptr_, other.ptr_);
+    swap(refcount_, other.refcount_);
+  }
 
  private:
-  const FileDescriptor* file_;
-  const Params& params_;
-  string java_package_;
-  string classname_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
+  typedef int RefcountT;
+  T* ptr_;
+  RefcountT* refcount_;
 };
 
-}  // namespace javanano
-}  // namespace compiler
+}  // namespace python
 }  // namespace protobuf
 
 }  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_FILE_H__
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_THREAD_UNSAFE_SHARED_PTR_H__
diff --git a/python/google/protobuf/pyext/python_protobuf.h b/python/google/protobuf/python_protobuf.h
index beb6e460..beb6e460 100644
--- a/python/google/protobuf/pyext/python_protobuf.h
+++ b/python/google/protobuf/python_protobuf.h
diff --git a/python/google/protobuf/reflection.py b/python/google/protobuf/reflection.py
index 05bafd69..f4ce8caf 100755
--- a/python/google/protobuf/reflection.py
+++ b/python/google/protobuf/reflection.py
@@ -107,7 +107,7 @@ def MakeClass(descriptor):
     The Message class object described by the descriptor.
   """
   if descriptor in MESSAGE_CLASS_CACHE:
-      return MESSAGE_CLASS_CACHE[descriptor]
+    return MESSAGE_CLASS_CACHE[descriptor]
 
   attributes = {}
   for name, nested_type in descriptor.nested_types_by_name.items():
@@ -115,7 +115,7 @@ def MakeClass(descriptor):
 
   attributes[GeneratedProtocolMessageType._DESCRIPTOR_KEY] = descriptor
 
-  result = GeneratedProtocolMessageType(str(descriptor.name), (message.Message,),
-                                      attributes)
+  result = GeneratedProtocolMessageType(
+      str(descriptor.name), (message.Message,), attributes)
   MESSAGE_CLASS_CACHE[descriptor] = result
   return result
diff --git a/python/google/protobuf/symbol_database.py b/python/google/protobuf/symbol_database.py
index ecbef211..5ad869f4 100644
--- a/python/google/protobuf/symbol_database.py
+++ b/python/google/protobuf/symbol_database.py
@@ -78,10 +78,18 @@ class SymbolDatabase(message_factory.MessageFactory):
     """
 
     desc = message.DESCRIPTOR
-    self._classes[desc.full_name] = message
-    self.pool.AddDescriptor(desc)
+    self._classes[desc] = message
+    self.RegisterMessageDescriptor(desc)
     return message
 
+  def RegisterMessageDescriptor(self, message_descriptor):
+    """Registers the given message descriptor in the local database.
+
+    Args:
+      message_descriptor: a descriptor.MessageDescriptor.
+    """
+    self.pool.AddDescriptor(message_descriptor)
+
   def RegisterEnumDescriptor(self, enum_descriptor):
     """Registers the given enum descriptor in the local database.
 
@@ -94,6 +102,17 @@ class SymbolDatabase(message_factory.MessageFactory):
     self.pool.AddEnumDescriptor(enum_descriptor)
     return enum_descriptor
 
+  def RegisterServiceDescriptor(self, service_descriptor):
+    """Registers the given service descriptor in the local database.
+
+    Args:
+      service_descriptor: a descriptor.ServiceDescriptor.
+
+    Returns:
+      The provided descriptor.
+    """
+    self.pool.AddServiceDescriptor(service_descriptor)
+
   def RegisterFileDescriptor(self, file_descriptor):
     """Registers the given file descriptor in the local database.
 
@@ -121,7 +140,7 @@ class SymbolDatabase(message_factory.MessageFactory):
       KeyError: if the symbol could not be found.
     """
 
-    return self._classes[symbol]
+    return self._classes[self.pool.FindMessageTypeByName(symbol)]
 
   def GetMessages(self, files):
     # TODO(amauryfa): Fix the differences with MessageFactory.
@@ -142,20 +161,20 @@ class SymbolDatabase(message_factory.MessageFactory):
       KeyError: if a file could not be found.
     """
 
-    def _GetAllMessageNames(desc):
+    def _GetAllMessages(desc):
       """Walk a message Descriptor and recursively yields all message names."""
-      yield desc.full_name
+      yield desc
       for msg_desc in desc.nested_types:
-        for full_name in _GetAllMessageNames(msg_desc):
-          yield full_name
+        for nested_desc in _GetAllMessages(msg_desc):
+          yield nested_desc
 
     result = {}
     for file_name in files:
       file_desc = self.pool.FindFileByName(file_name)
       for msg_desc in file_desc.message_types_by_name.values():
-        for full_name in _GetAllMessageNames(msg_desc):
+        for desc in _GetAllMessages(msg_desc):
           try:
-            result[full_name] = self._classes[full_name]
+            result[desc.full_name] = self._classes[desc]
           except KeyError:
             # This descriptor has no registered class, skip it.
             pass
diff --git a/python/google/protobuf/text_format.py b/python/google/protobuf/text_format.py
index 90f6ce42..2cbd21bc 100755
--- a/python/google/protobuf/text_format.py
+++ b/python/google/protobuf/text_format.py
@@ -126,7 +126,8 @@ def MessageToString(message,
                     float_format=None,
                     use_field_number=False,
                     descriptor_pool=None,
-                    indent=0):
+                    indent=0,
+                    message_formatter=None):
   """Convert protobuf message to text format.
 
   Floating point values can be formatted compactly with 15 digits of
@@ -140,14 +141,19 @@ def MessageToString(message,
     as_one_line: Don't introduce newlines between fields.
     pointy_brackets: If True, use angle brackets instead of curly braces for
       nesting.
-    use_index_order: If True, print fields of a proto message using the order
-      defined in source code instead of the field number. By default, use the
-      field number order.
+    use_index_order: If True, fields of a proto message will be printed using
+      the order defined in source code instead of the field number, extensions
+      will be printed at the end of the message and their relative order is
+      determined by the extension number. By default, use the field number
+      order.
     float_format: If set, use this to specify floating point number formatting
       (per the "Format Specification Mini-Language"); otherwise, str() is used.
     use_field_number: If True, print field numbers instead of names.
     descriptor_pool: A DescriptorPool used to resolve Any types.
     indent: The indent level, in terms of spaces, for pretty print.
+    message_formatter: A function(message, indent, as_one_line): unicode|None
+      to custom format selected sub-messages (usually based on message type).
+      Use to pretty print parts of the protobuf for easier diffing.
 
   Returns:
     A string of the text formatted protocol buffer message.
@@ -155,7 +161,7 @@ def MessageToString(message,
   out = TextWriter(as_utf8)
   printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                      use_index_order, float_format, use_field_number,
-                     descriptor_pool)
+                     descriptor_pool, message_formatter)
   printer.PrintMessage(message)
   result = out.getvalue()
   out.close()
@@ -179,10 +185,11 @@ def PrintMessage(message,
                  use_index_order=False,
                  float_format=None,
                  use_field_number=False,
-                 descriptor_pool=None):
+                 descriptor_pool=None,
+                 message_formatter=None):
   printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
                      use_index_order, float_format, use_field_number,
-                     descriptor_pool)
+                     descriptor_pool, message_formatter)
   printer.PrintMessage(message)
 
 
@@ -194,10 +201,11 @@ def PrintField(field,
                as_one_line=False,
                pointy_brackets=False,
                use_index_order=False,
-               float_format=None):
+               float_format=None,
+               message_formatter=None):
   """Print a single field name/value pair."""
   printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
-                     use_index_order, float_format)
+                     use_index_order, float_format, message_formatter)
   printer.PrintField(field, value)
 
 
@@ -209,10 +217,11 @@ def PrintFieldValue(field,
                     as_one_line=False,
                     pointy_brackets=False,
                     use_index_order=False,
-                    float_format=None):
+                    float_format=None,
+                    message_formatter=None):
   """Print a single field value (not including name)."""
   printer = _Printer(out, indent, as_utf8, as_one_line, pointy_brackets,
-                     use_index_order, float_format)
+                     use_index_order, float_format, message_formatter)
   printer.PrintFieldValue(field, value)
 
 
@@ -228,6 +237,9 @@ def _BuildMessageFromTypeName(type_name, descriptor_pool):
     wasn't found matching type_name.
   """
   # pylint: disable=g-import-not-at-top
+  if descriptor_pool is None:
+    from google.protobuf import descriptor_pool as pool_mod
+    descriptor_pool = pool_mod.Default()
   from google.protobuf import symbol_database
   database = symbol_database.Default()
   try:
@@ -250,7 +262,8 @@ class _Printer(object):
                use_index_order=False,
                float_format=None,
                use_field_number=False,
-               descriptor_pool=None):
+               descriptor_pool=None,
+               message_formatter=None):
     """Initialize the Printer.
 
     Floating point values can be formatted compactly with 15 digits of
@@ -273,6 +286,9 @@ class _Printer(object):
         used.
       use_field_number: If True, print field numbers instead of names.
       descriptor_pool: A DescriptorPool used to resolve Any types.
+      message_formatter: A function(message, indent, as_one_line): unicode|None
+        to custom format selected sub-messages (usually based on message type).
+        Use to pretty print parts of the protobuf for easier diffing.
     """
     self.out = out
     self.indent = indent
@@ -283,6 +299,7 @@ class _Printer(object):
     self.float_format = float_format
     self.use_field_number = use_field_number
     self.descriptor_pool = descriptor_pool
+    self.message_formatter = message_formatter
 
   def _TryPrintAsAnyMessage(self, message):
     """Serializes if message is a google.protobuf.Any field."""
@@ -297,22 +314,36 @@ class _Printer(object):
     else:
       return False
 
+  def _TryCustomFormatMessage(self, message):
+    formatted = self.message_formatter(message, self.indent, self.as_one_line)
+    if formatted is None:
+      return False
+
+    out = self.out
+    out.write(' ' * self.indent)
+    out.write(formatted)
+    out.write(' ' if self.as_one_line else '\n')
+    return True
+
   def PrintMessage(self, message):
     """Convert protobuf message to text format.
 
     Args:
       message: The protocol buffers message.
     """
+    if self.message_formatter and self._TryCustomFormatMessage(message):
+      return
     if (message.DESCRIPTOR.full_name == _ANY_FULL_TYPE_NAME and
-        self.descriptor_pool and self._TryPrintAsAnyMessage(message)):
+        self._TryPrintAsAnyMessage(message)):
       return
     fields = message.ListFields()
     if self.use_index_order:
-      fields.sort(key=lambda x: x[0].index)
+      fields.sort(
+          key=lambda x: x[0].number if x[0].is_extension else x[0].index)
     for field, value in fields:
       if _IsMapEntry(field):
         for key in sorted(value):
-          # This is slow for maps with submessage entires because it copies the
+          # This is slow for maps with submessage entries because it copies the
           # entire tree.  Unfortunately this would take significant refactoring
           # of this file to work around.
           #
@@ -422,15 +453,33 @@ class _Printer(object):
 def Parse(text,
           message,
           allow_unknown_extension=False,
-          allow_field_number=False):
+          allow_field_number=False,
+          descriptor_pool=None):
   """Parses a text representation of a protocol message into a message.
 
+  NOTE: for historical reasons this function does not clear the input
+  message. This is different from what the binary msg.ParseFrom(...) does.
+
+  Example
+    a = MyProto()
+    a.repeated_field.append('test')
+    b = MyProto()
+
+    text_format.Parse(repr(a), b)
+    text_format.Parse(repr(a), b) # repeated_field contains ["test", "test"]
+
+    # Binary version:
+    b.ParseFromString(a.SerializeToString()) # repeated_field is now "test"
+
+  Caller is responsible for clearing the message as needed.
+
   Args:
     text: Message text representation.
     message: A protocol buffer message to merge into.
     allow_unknown_extension: if True, skip over missing extensions and keep
       parsing
     allow_field_number: if True, both field number and field name are allowed.
+    descriptor_pool: A DescriptorPool used to resolve Any types.
 
   Returns:
     The same message passed as argument.
@@ -439,9 +488,15 @@ def Parse(text,
     ParseError: On text parsing problems.
   """
   if not isinstance(text, str):
-    text = text.decode('utf-8')
-  return ParseLines(
-      text.split('\n'), message, allow_unknown_extension, allow_field_number)
+    if six.PY3:
+      text = text.decode('utf-8')
+    else:
+      text = text.encode('utf-8')
+  return ParseLines(text.split('\n'),
+                    message,
+                    allow_unknown_extension,
+                    allow_field_number,
+                    descriptor_pool=descriptor_pool)
 
 
 def Merge(text,
@@ -468,6 +523,11 @@ def Merge(text,
   Raises:
     ParseError: On text parsing problems.
   """
+  if not isinstance(text, str):
+    if six.PY3:
+      text = text.decode('utf-8')
+    else:
+      text = text.encode('utf-8')
   return MergeLines(
       text.split('\n'),
       message,
@@ -479,7 +539,8 @@ def Merge(text,
 def ParseLines(lines,
                message,
                allow_unknown_extension=False,
-               allow_field_number=False):
+               allow_field_number=False,
+               descriptor_pool=None):
   """Parses a text representation of a protocol message into a message.
 
   Args:
@@ -496,7 +557,9 @@ def ParseLines(lines,
   Raises:
     ParseError: On text parsing problems.
   """
-  parser = _Parser(allow_unknown_extension, allow_field_number)
+  parser = _Parser(allow_unknown_extension,
+                   allow_field_number,
+                   descriptor_pool=descriptor_pool)
   return parser.ParseLines(lines, message)
 
 
@@ -513,6 +576,7 @@ def MergeLines(lines,
     allow_unknown_extension: if True, skip over missing extensions and keep
       parsing
     allow_field_number: if True, both field number and field name are allowed.
+    descriptor_pool: A DescriptorPool used to resolve Any types.
 
   Returns:
     The same message passed as argument.
@@ -584,11 +648,30 @@ class _Parser(object):
       ParseError: In case of text parsing problems.
     """
     message_descriptor = message.DESCRIPTOR
-    if (hasattr(message_descriptor, 'syntax') and
-        message_descriptor.syntax == 'proto3'):
-      # Proto3 doesn't represent presence so we can't test if multiple
-      # scalars have occurred.  We have to allow them.
-      self._allow_multiple_scalars = True
+    if (message_descriptor.full_name == _ANY_FULL_TYPE_NAME and
+        tokenizer.TryConsume('[')):
+      type_url_prefix, packed_type_name = self._ConsumeAnyTypeUrl(tokenizer)
+      tokenizer.Consume(']')
+      tokenizer.TryConsume(':')
+      if tokenizer.TryConsume('<'):
+        expanded_any_end_token = '>'
+      else:
+        tokenizer.Consume('{')
+        expanded_any_end_token = '}'
+      expanded_any_sub_message = _BuildMessageFromTypeName(packed_type_name,
+                                                           self.descriptor_pool)
+      if not expanded_any_sub_message:
+        raise ParseError('Type %s not found in descriptor pool' %
+                         packed_type_name)
+      while not tokenizer.TryConsume(expanded_any_end_token):
+        if tokenizer.AtEnd():
+          raise tokenizer.ParseErrorPreviousToken('Expected "%s".' %
+                                                  (expanded_any_end_token,))
+        self._MergeField(tokenizer, expanded_any_sub_message)
+      message.Pack(expanded_any_sub_message,
+                   type_url_prefix=type_url_prefix)
+      return
+
     if tokenizer.TryConsume('['):
       name = [tokenizer.ConsumeIdentifier()]
       while tokenizer.TryConsume('.'):
@@ -607,7 +690,11 @@ class _Parser(object):
           field = None
         else:
           raise tokenizer.ParseErrorPreviousToken(
-              'Extension "%s" not registered.' % name)
+              'Extension "%s" not registered. '
+              'Did you import the _pb2 module which defines it? '
+              'If you are trying to place the extension in the MessageSet '
+              'field of another message that is in an Any or MessageSet field, '
+              'that message\'s _pb2 module must be imported as well' % name)
       elif message_descriptor != field.containing_type:
         raise tokenizer.ParseErrorPreviousToken(
             'Extension "%s" does not extend message type "%s".' %
@@ -665,11 +752,12 @@ class _Parser(object):
       if (field.label == descriptor.FieldDescriptor.LABEL_REPEATED and
           tokenizer.TryConsume('[')):
         # Short repeated format, e.g. "foo: [1, 2, 3]"
-        while True:
-          merger(tokenizer, message, field)
-          if tokenizer.TryConsume(']'):
-            break
-          tokenizer.Consume(',')
+        if not tokenizer.TryConsume(']'):
+          while True:
+            merger(tokenizer, message, field)
+            if tokenizer.TryConsume(']'):
+              break
+            tokenizer.Consume(',')
 
       else:
         merger(tokenizer, message, field)
@@ -686,17 +774,17 @@ class _Parser(object):
   def _ConsumeAnyTypeUrl(self, tokenizer):
     """Consumes a google.protobuf.Any type URL and returns the type name."""
     # Consume "type.googleapis.com/".
-    tokenizer.ConsumeIdentifier()
+    prefix = [tokenizer.ConsumeIdentifier()]
     tokenizer.Consume('.')
-    tokenizer.ConsumeIdentifier()
+    prefix.append(tokenizer.ConsumeIdentifier())
     tokenizer.Consume('.')
-    tokenizer.ConsumeIdentifier()
+    prefix.append(tokenizer.ConsumeIdentifier())
     tokenizer.Consume('/')
     # Consume the fully-qualified type name.
     name = [tokenizer.ConsumeIdentifier()]
     while tokenizer.TryConsume('.'):
       name.append(tokenizer.ConsumeIdentifier())
-    return '.'.join(name)
+    return '.'.join(prefix), '.'.join(name)
 
   def _MergeMessageField(self, tokenizer, message, field):
     """Merges a single scalar field into a message.
@@ -717,34 +805,7 @@ class _Parser(object):
       tokenizer.Consume('{')
       end_token = '}'
 
-    if (field.message_type.full_name == _ANY_FULL_TYPE_NAME and
-        tokenizer.TryConsume('[')):
-      packed_type_name = self._ConsumeAnyTypeUrl(tokenizer)
-      tokenizer.Consume(']')
-      tokenizer.TryConsume(':')
-      if tokenizer.TryConsume('<'):
-        expanded_any_end_token = '>'
-      else:
-        tokenizer.Consume('{')
-        expanded_any_end_token = '}'
-      if not self.descriptor_pool:
-        raise ParseError('Descriptor pool required to parse expanded Any field')
-      expanded_any_sub_message = _BuildMessageFromTypeName(packed_type_name,
-                                                           self.descriptor_pool)
-      if not expanded_any_sub_message:
-        raise ParseError('Type %s not found in descriptor pool' %
-                         packed_type_name)
-      while not tokenizer.TryConsume(expanded_any_end_token):
-        if tokenizer.AtEnd():
-          raise tokenizer.ParseErrorPreviousToken('Expected "%s".' %
-                                                  (expanded_any_end_token,))
-        self._MergeField(tokenizer, expanded_any_sub_message)
-      if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
-        any_message = getattr(message, field.name).add()
-      else:
-        any_message = getattr(message, field.name)
-      any_message.Pack(expanded_any_sub_message)
-    elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+    if field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
       if field.is_extension:
         sub_message = message.Extensions[field].add()
       elif is_map_entry:
@@ -753,8 +814,20 @@ class _Parser(object):
         sub_message = getattr(message, field.name).add()
     else:
       if field.is_extension:
+        if (not self._allow_multiple_scalars and
+            message.HasExtension(field)):
+          raise tokenizer.ParseErrorPreviousToken(
+              'Message type "%s" should not have multiple "%s" extensions.' %
+              (message.DESCRIPTOR.full_name, field.full_name))
         sub_message = message.Extensions[field]
       else:
+        # Also apply _allow_multiple_scalars to message field.
+        # TODO(jieluo): Change to _allow_singular_overwrites.
+        if (not self._allow_multiple_scalars and
+            message.HasField(field.name)):
+          raise tokenizer.ParseErrorPreviousToken(
+              'Message type "%s" should not have multiple "%s" fields.' %
+              (message.DESCRIPTOR.full_name, field.name))
         sub_message = getattr(message, field.name)
       sub_message.SetInParent()
 
@@ -771,6 +844,12 @@ class _Parser(object):
       else:
         getattr(message, field.name)[sub_message.key] = sub_message.value
 
+  @staticmethod
+  def _IsProto3Syntax(message):
+    message_descriptor = message.DESCRIPTOR
+    return (hasattr(message_descriptor, 'syntax') and
+            message_descriptor.syntax == 'proto3')
+
   def _MergeScalarField(self, tokenizer, message, field):
     """Merges a single scalar field into a message.
 
@@ -820,15 +899,20 @@ class _Parser(object):
       else:
         getattr(message, field.name).append(value)
     else:
+      # Proto3 doesn't represent presence so we can't test if multiple scalars
+      # have occurred. We have to allow them.
+      can_check_presence = not self._IsProto3Syntax(message)
       if field.is_extension:
-        if not self._allow_multiple_scalars and message.HasExtension(field):
+        if (not self._allow_multiple_scalars and can_check_presence and
+            message.HasExtension(field)):
           raise tokenizer.ParseErrorPreviousToken(
               'Message type "%s" should not have multiple "%s" extensions.' %
               (message.DESCRIPTOR.full_name, field.full_name))
         else:
           message.Extensions[field] = value
       else:
-        if not self._allow_multiple_scalars and message.HasField(field.name):
+        if (not self._allow_multiple_scalars and can_check_presence and
+            message.HasField(field.name)):
           raise tokenizer.ParseErrorPreviousToken(
               'Message type "%s" should not have multiple "%s" fields.' %
               (message.DESCRIPTOR.full_name, field.name))
@@ -868,7 +952,7 @@ def _SkipField(tokenizer):
       tokenizer.ConsumeIdentifier()
     tokenizer.Consume(']')
   else:
-    tokenizer.ConsumeIdentifier()
+    tokenizer.ConsumeIdentifierOrNumber()
 
   _SkipFieldContents(tokenizer)
 
@@ -1023,6 +1107,22 @@ class Tokenizer(object):
     self.NextToken()
     return result
 
+  def ConsumeCommentOrTrailingComment(self):
+    """Consumes a comment, returns a 2-tuple (trailing bool, comment str)."""
+
+    # Tokenizer initializes _previous_line and _previous_column to 0. As the
+    # tokenizer starts, it looks like there is a previous token on the line.
+    just_started = self._line == 0 and self._column == 0
+
+    before_parsing = self._previous_line
+    comment = self.ConsumeComment()
+
+    # A trailing comment is a comment on the same line than the previous token.
+    trailing = (self._previous_line == before_parsing
+                and not just_started)
+
+    return trailing, comment
+
   def TryConsumeIdentifier(self):
     try:
       self.ConsumeIdentifier()
@@ -1063,7 +1163,7 @@ class Tokenizer(object):
     """
     result = self.token
     if not self._IDENTIFIER_OR_NUMBER.match(result):
-      raise self.ParseError('Expected identifier or number.')
+      raise self.ParseError('Expected identifier or number, got %s.' % result)
     self.NextToken()
     return result
 
@@ -1481,6 +1581,11 @@ def ParseEnum(field, value):
                        (enum_descriptor.full_name, value))
   else:
     # Numeric value.
+    if hasattr(field.file, 'syntax'):
+      # Attribute is checked for compatibility.
+      if field.file.syntax == 'proto3':
+        # Proto3 accept numeric unknown enums.
+        return number
     enum_value = enum_descriptor.values_by_number.get(number, None)
     if enum_value is None:
       raise ValueError('Enum type "%s" has no value with number %d.' %
diff --git a/python/google/protobuf/util/__init__.py b/python/google/protobuf/util/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/python/google/protobuf/util/__init__.py
diff --git a/python/mox.py b/python/mox.py
index 257468e5..43db0219 100755
--- a/python/mox.py
+++ b/python/mox.py
@@ -778,7 +778,7 @@ class Comparator:
       rhs: any python object
     """
 
-    raise NotImplementedError, 'method must be implemented by a subclass.'
+    raise NotImplementedError('method must be implemented by a subclass.')
 
   def __eq__(self, rhs):
     return self.equals(rhs)
diff --git a/python/release.sh b/python/release.sh
new file mode 100755
index 00000000..a71cc7f5
--- /dev/null
+++ b/python/release.sh
@@ -0,0 +1,116 @@
+#!/bin/bash
+
+set -ex
+
+function get_source_version() {
+  grep "__version__ = '.*'" python/google/protobuf/__init__.py | sed -r "s/__version__ = '(.*)'/\1/"
+}
+
+function run_install_test() {
+  local VERSION=$1
+  local PYTHON=$2
+  local PYPI=$3
+
+  virtualenv --no-site-packages -p `which $PYTHON` test-venv
+
+  # Intentionally put a broken protoc in the path to make sure installation
+  # doesn't require protoc installed.
+  touch test-venv/bin/protoc
+  chmod +x test-venv/bin/protoc
+
+  source test-venv/bin/activate
+  pip install -i ${PYPI} protobuf==${VERSION} --no-cache-dir
+  deactivate
+  rm -fr test-venv
+}
+
+
+[ $# -lt 1 ] && {
+  echo "Usage: $0 VERSION ["
+  echo ""
+  echo "Examples:"
+  echo "  Test 3.3.0 release using version number 3.3.0.dev1:"
+  echo "    $0 3.0.0 dev1"
+  echo "  Actually release 3.3.0 to PyPI:"
+  echo "    $0 3.3.0"
+  exit 1
+}
+VERSION=$1
+DEV=$2
+
+# Make sure we are in a protobuf source tree.
+[ -f "python/google/protobuf/__init__.py" ] || {
+  echo "This script must be ran under root of protobuf source tree."
+  exit 1
+}
+
+# Make sure all files are world-readable.
+find python -type d -exec chmod a+r,a+x {} +
+find python -type f -exec chmod a+r {} +
+umask 0022
+
+# Check that the supplied version number matches what's inside the source code.
+SOURCE_VERSION=`get_source_version`
+
+[ "${VERSION}" == "${SOURCE_VERSION}" -o "${VERSION}.${DEV}" == "${SOURCE_VERSION}" ] || {
+  echo "Version number specified on the command line ${VERSION} doesn't match"
+  echo "the actual version number in the source code: ${SOURCE_VERSION}"
+  exit 1
+}
+
+TESTING_ONLY=1
+TESTING_VERSION=${VERSION}.${DEV}
+if [ -z "${DEV}" ]; then
+  read -p "You are releasing ${VERSION} to PyPI. Are you sure? [y/n]" -r
+  echo
+  if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+    exit 1
+  fi
+  TESTING_ONLY=0
+  TESTING_VERSION=${VERSION}
+else
+  # Use dev version number for testing.
+  sed -i -r "s/__version__ = '.*'/__version__ = '${VERSION}.${DEV}'/" python/google/protobuf/__init__.py
+fi
+
+cd python
+
+# Run tests locally.
+python setup.py build
+python setup.py test
+
+# Deploy source package to testing PyPI
+python setup.py sdist upload -r https://test.pypi.org/legacy/
+
+# Test locally with different python versions.
+run_install_test ${TESTING_VERSION} python2.7 https://test.pypi.org/simple
+run_install_test ${TESTING_VERSION} python3.4 https://test.pypi.org/simple
+
+# Deploy egg/wheel packages to testing PyPI and test again.
+python setup.py bdist_egg bdist_wheel upload -r https://test.pypi.org/legacy/
+
+run_install_test ${TESTING_VERSION} python2.7 https://test.pypi.org/simple
+run_install_test ${TESTING_VERSION} python3.4 https://test.pypi.org/simple
+
+echo "All install tests have passed using testing PyPI."
+
+if [ $TESTING_ONLY -eq 0 ]; then
+  read -p "Publish to PyPI? [y/n]" -r
+  echo
+  if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+    exit 1
+  fi
+  echo "Publishing to PyPI..."
+  # Be sure to run build before sdist, because otherwise sdist will not include
+  # well-known types.
+  python setup.py clean build sdist upload
+  # Be sure to run clean before bdist_xxx, because otherwise bdist_xxx will
+  # include files you may not want in the package. E.g., if you have built
+  # and tested with --cpp_implemenation, bdist_xxx will include the _message.so
+  # file even when you no longer pass the --cpp_implemenation flag. See:
+  #   https://github.com/google/protobuf/issues/3042
+  python setup.py clean build bdist_egg bdist_wheel upload
+else
+  # Set the version number back (i.e., remove dev suffix).
+  sed -i -r "s/__version__ = '.*'/__version__ = '${VERSION}'/" google/protobuf/__init__.py
+fi
diff --git a/python/release/wheel/Dockerfile b/python/release/wheel/Dockerfile
new file mode 100644
index 00000000..f38ec2f5
--- /dev/null
+++ b/python/release/wheel/Dockerfile
@@ -0,0 +1,6 @@
+FROM quay.io/pypa/manylinux1_x86_64
+
+RUN yum install -y libtool
+RUN /opt/python/cp27-cp27mu/bin/pip install twine
+
+COPY protobuf_optimized_pip.sh /
diff --git a/python/release/wheel/README.md b/python/release/wheel/README.md
new file mode 100644
index 00000000..edda2cd7
--- /dev/null
+++ b/python/release/wheel/README.md
@@ -0,0 +1,17 @@
+Description
+------------------------------
+This directory is used to build released wheels according to PEP513 and upload
+them to pypi.
+
+Usage
+------------------------------
+For example, to release 3.3.0:
+    ./protobuf_optimized_pip.sh 3.3.0 PYPI_USERNAME PYPI_PASSWORD
+
+Structure
+------------------------------
+| Source                    | Source                                                       |
+|--------------------------------------|---------------------------------------------------|
+| protobuf_optimized_pip.sh | Entry point. Calling Dockerfile and build_wheel_manylinux.sh |
+| Dockerfile                | Build docker image according to PEP513.                      |
+| build_wheel_manylinux.sh  | Build wheel packages in the docker container.                |
diff --git a/python/release/wheel/build_wheel_manylinux.sh b/python/release/wheel/build_wheel_manylinux.sh
new file mode 100755
index 00000000..39fd8c12
--- /dev/null
+++ b/python/release/wheel/build_wheel_manylinux.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Print usage and fail.
+function usage() {
+  echo "Usage: protobuf_optimized_pip.sh PROTOBUF_VERSION PYPI_USERNAME PYPI_PASSWORD" >&2
+  exit 1   # Causes caller to exit because we use -e.
+}
+
+# Validate arguments.
+if [ $0 != ./build_wheel_manylinux.sh ]; then
+  echo "Please run this script from the directory in which it is located." >&2
+  exit 1
+fi
+
+if [ $# -lt 3 ]; then
+  usage
+  exit 1
+fi
+
+PROTOBUF_VERSION=$1
+PYPI_USERNAME=$2
+PYPI_PASSWORD=$3
+
+docker rmi protobuf-python-wheel
+docker build . -t protobuf-python-wheel
+docker run --rm protobuf-python-wheel ./protobuf_optimized_pip.sh $PROTOBUF_VERSION $PYPI_USERNAME $PYPI_PASSWORD
+docker rmi protobuf-python-wheel
diff --git a/python/release/wheel/protobuf_optimized_pip.sh b/python/release/wheel/protobuf_optimized_pip.sh
new file mode 100755
index 00000000..98306f4c
--- /dev/null
+++ b/python/release/wheel/protobuf_optimized_pip.sh
@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+# DO NOT use this script manually! Called by docker.
+
+set -ex
+
+# Print usage and fail.
+function usage() {
+  echo "Usage: protobuf_optimized_pip.sh PROTOBUF_VERSION" >&2
+  exit 1   # Causes caller to exit because we use -e.
+}
+
+# Build wheel
+function build_wheel() {
+  PYTHON_VERSION=$1
+  PYTHON_BIN=/opt/python/${PYTHON_VERSION}/bin/python
+
+  $PYTHON_BIN setup.py bdist_wheel --cpp_implementation --compile_static_extension
+  auditwheel repair dist/protobuf-${PROTOBUF_VERSION}-${PYTHON_VERSION}-linux_x86_64.whl
+}
+
+# Validate arguments.
+if [ $0 != ./protobuf_optimized_pip.sh ]; then
+  echo "Please run this script from the directory in which it is located." >&2
+  exit 1
+fi
+
+if [ $# -lt 1 ]; then
+  usage
+  exit 1
+fi
+
+PROTOBUF_VERSION=$1
+PYPI_USERNAME=$2
+PYPI_PASSWORD=$3
+
+DIR=${PWD}/'protobuf-python-build'
+PYTHON_VERSIONS=('cp27-cp27mu' 'cp33-cp33m' 'cp34-cp34m' 'cp35-cp35m' 'cp36-cp36m')
+
+mkdir -p ${DIR}
+cd ${DIR}
+curl -SsL -O https://github.com/google/protobuf/archive/v${PROTOBUF_VERSION}.tar.gz
+tar xzf v${PROTOBUF_VERSION}.tar.gz
+cd $DIR/protobuf-${PROTOBUF_VERSION}
+
+# Autoconf on centos 5.11 cannot recognize AC_PROG_OBJC.
+sed -i '/AC_PROG_OBJC/d' configure.ac
+sed -i 's/conformance\/Makefile//g' configure.ac
+
+# Use the /usr/bin/autoconf and related tools to pick the correct aclocal macros
+export PATH="/usr/bin:$PATH"
+
+# Build protoc
+./autogen.sh
+CXXFLAGS="-fPIC -g -O2" ./configure
+make -j8
+export PROTOC=$DIR/src/protoc
+
+cd python
+
+for PYTHON_VERSION in "${PYTHON_VERSIONS[@]}"
+do
+  build_wheel $PYTHON_VERSION
+done
+
+/opt/python/cp27-cp27mu/bin/twine upload wheelhouse/*
diff --git a/python/setup.py b/python/setup.py
index a2026706..9a328cb5 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -78,8 +78,10 @@ def generate_proto(source, require = True):
 
 def GenerateUnittestProtos():
   generate_proto("../src/google/protobuf/any_test.proto", False)
+  generate_proto("../src/google/protobuf/map_proto2_unittest.proto", False)
   generate_proto("../src/google/protobuf/map_unittest.proto", False)
   generate_proto("../src/google/protobuf/test_messages_proto3.proto", False)
+  generate_proto("../src/google/protobuf/test_messages_proto2.proto", False)
   generate_proto("../src/google/protobuf/unittest_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena.proto", False)
   generate_proto("../src/google/protobuf/unittest_no_arena_import.proto", False)
@@ -105,6 +107,7 @@ def GenerateUnittestProtos():
   generate_proto("google/protobuf/internal/more_extensions.proto", False)
   generate_proto("google/protobuf/internal/more_extensions_dynamic.proto", False)
   generate_proto("google/protobuf/internal/more_messages.proto", False)
+  generate_proto("google/protobuf/internal/no_package.proto", False)
   generate_proto("google/protobuf/internal/packed_field_test.proto", False)
   generate_proto("google/protobuf/internal/test_bad_identifiers.proto", False)
   generate_proto("google/protobuf/pyext/python.proto", False)
@@ -117,9 +120,7 @@ class clean(_clean):
       for filename in filenames:
         filepath = os.path.join(dirpath, filename)
         if filepath.endswith("_pb2.py") or filepath.endswith(".pyc") or \
-          filepath.endswith(".so") or filepath.endswith(".o") or \
-          filepath.endswith('google/protobuf/compiler/__init__.py') or \
-          filepath.endswith('google/protobuf/util/__init__.py'):
+          filepath.endswith(".so") or filepath.endswith(".o"):
           os.remove(filepath)
     # _clean is an old-style class, so super() doesn't work.
     _clean.run(self)
@@ -141,12 +142,6 @@ class build_py(_build_py):
     generate_proto("../src/google/protobuf/wrappers.proto")
     GenerateUnittestProtos()
 
-    # Make sure google.protobuf/** are valid packages.
-    for path in ['', 'internal/', 'compiler/', 'pyext/', 'util/']:
-      try:
-        open('google/protobuf/%s__init__.py' % path, 'a').close()
-      except EnvironmentError:
-        pass
     # _build_py is an old-style class, so super() doesn't work.
     _build_py.run(self)
 
@@ -176,9 +171,6 @@ if __name__ == '__main__':
     # extension. Note that those libraries have to be compiled with
     # -fPIC for this to work.
     compile_static_ext = get_option_from_sys_argv('--compile_static_extension')
-    extra_compile_args = ['-Wno-write-strings',
-                          '-Wno-invalid-offsetof',
-                          '-Wno-sign-compare']
     libraries = ['protobuf']
     extra_objects = None
     if compile_static_ext:
@@ -187,6 +179,25 @@ if __name__ == '__main__':
                        '../src/.libs/libprotobuf-lite.a']
     test_conformance.target = 'test_python_cpp'
 
+    extra_compile_args = []
+
+    if sys.platform != 'win32':
+        extra_compile_args.append('-Wno-write-strings')
+        extra_compile_args.append('-Wno-invalid-offsetof')
+        extra_compile_args.append('-Wno-sign-compare')
+
+    # https://github.com/Theano/Theano/issues/4926
+    if sys.platform == 'win32':
+      extra_compile_args.append('-D_hypot=hypot')
+
+    # https://github.com/tpaviot/pythonocc-core/issues/48
+    if sys.platform == 'win32' and  '64 bit' in sys.version:
+      extra_compile_args.append('-DMS_WIN64')
+
+    # MSVS default is dymanic
+    if (sys.platform == 'win32'):
+      extra_compile_args.append('/MT')
+
     if "clang" in os.popen('$CC --version 2> /dev/null').read():
       extra_compile_args.append('-Wno-shorten-64-to-32')
 
@@ -195,6 +206,8 @@ if __name__ == '__main__':
       v = float('.'.join(v.split('.')[:2]))
       if v >= 10.12:
         extra_compile_args.append('-std=c++11')
+    elif os.getenv('KOKORO_BUILD_NUMBER') or os.getenv('KOKORO_BUILD_ID'):
+        extra_compile_args.append('-std=c++11')
 
     if warnings_as_errors in sys.argv:
       extra_compile_args.append('-Werror')
@@ -214,7 +227,7 @@ if __name__ == '__main__':
         Extension(
             "google.protobuf.internal._api_implementation",
             glob.glob('google/protobuf/internal/api_implementation.cc'),
-            extra_compile_args=['-DPYTHON_PROTO2_CPP_IMPL_V2'],
+            extra_compile_args=extra_compile_args + ['-DPYTHON_PROTO2_CPP_IMPL_V2'],
         ),
     ])
     os.environ['PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION'] = 'cpp'
@@ -238,7 +251,6 @@ if __name__ == '__main__':
       classifiers=[
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.3",
diff --git a/python/stubout.py b/python/stubout.py
index aee4f2da..ba391045 100755
--- a/python/stubout.py
+++ b/python/stubout.py
@@ -17,6 +17,9 @@
 # This file is used for testing.  The original is at:
 #   http://code.google.com/p/pymox/
 
+import inspect
+
+
 class StubOutForTesting:
   """Sample Usage:
      You want os.path.exists() to always return true during testing.
diff --git a/python/tox.ini b/python/tox.ini
index 1600db21..38a81b4f 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{26,27,33,34}-{cpp,python}
+    py{27,33,34,35,36}-{cpp,python}
 
 [testenv]
 usedevelop=true
@@ -9,6 +9,7 @@ setenv =
     cpp: LD_LIBRARY_PATH={toxinidir}/../src/.libs
     cpp: DYLD_LIBRARY_PATH={toxinidir}/../src/.libs
     cpp: PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp
+    python: PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
 commands =
     python setup.py -q build_py
     python: python setup.py -q build
diff --git a/ruby/README.md b/ruby/README.md
index f28e05a7..78e86015 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -16,10 +16,6 @@ install it as you would any other gem:
 
     $ gem install [--prerelease] google-protobuf
 
-The `--pre` flag is necessary if we have not yet made a non-alpha/beta release
-of the Ruby extension; it allows `gem` to consider these "pre-release"
-alpha/beta versions.
-
 Once the gem is installed, you may or may not need `protoc`. If you write your
 message type descriptions directly in the Ruby DSL, you do not need it.
 However, if you wish to generate the Ruby DSL from a `.proto` file, you will
diff --git a/ruby/Rakefile b/ruby/Rakefile
index 40d0a314..013bc99a 100644
--- a/ruby/Rakefile
+++ b/ruby/Rakefile
@@ -52,6 +52,12 @@ if RUBY_PLATFORM == "java"
   end
 else
   Rake::ExtensionTask.new("protobuf_c", spec) do |ext|
+    unless RUBY_PLATFORM =~ /darwin/
+      # TODO: also set "no_native to true" for mac if possible. As is,
+      # "no_native" can only be set if the RUBY_PLATFORM doing
+      # cross-compilation is contained in the "ext.cross_platform" array.
+      ext.no_native = true
+    end
     ext.ext_dir = "ext/google/protobuf_c"
     ext.lib_dir = "lib/google"
     ext.cross_compile = true
@@ -64,13 +70,13 @@ else
 
   task 'gem:windows' do
     require 'rake_compiler_dock'
-    RakeCompilerDock.sh "bundle && IN_DOCKER=true rake cross native gem RUBY_CC_VERSION=2.3.0:2.2.2:2.1.5:2.0.0"
+    RakeCompilerDock.sh "bundle && IN_DOCKER=true rake cross native gem RUBY_CC_VERSION=2.5.0:2.4.0:2.3.0:2.2.2:2.1.6:2.0.0"
   end
 
   if RUBY_PLATFORM =~ /darwin/
     task 'gem:native' do
       system "rake genproto"
-      system "rake cross native gem RUBY_CC_VERSION=2.3.0:2.2.2:2.1.5:2.0.0"
+      system "rake cross native gem RUBY_CC_VERSION=2.5.0:2.4.0:2.3.0:2.2.2:2.1.6:2.0.0"
     end
   else
     task 'gem:native' => [:genproto, 'gem:windows']
@@ -81,6 +87,7 @@ end
 # Proto for tests.
 genproto_output << "tests/generated_code.rb"
 genproto_output << "tests/test_import.rb"
+genproto_output << "tests/test_ruby_package.rb"
 file "tests/generated_code.rb" => "tests/generated_code.proto" do |file_task|
   sh "../src/protoc --ruby_out=. tests/generated_code.proto"
 end
@@ -89,6 +96,10 @@ file "tests/test_import.rb" => "tests/test_import.proto" do |file_task|
   sh "../src/protoc --ruby_out=. tests/test_import.proto"
 end
 
+file "tests/test_ruby_package.rb" => "tests/test_ruby_package.proto" do |file_task|
+  sh "../src/protoc --ruby_out=. tests/test_ruby_package.proto"
+end
+
 task :genproto => genproto_output
 
 task :clean do
@@ -99,7 +110,13 @@ Gem::PackageTask.new(spec) do |pkg|
 end
 
 Rake::TestTask.new(:test => :build) do |t|
-  t.test_files = FileList["tests/*.rb"]
+  t.test_files = FileList["tests/*.rb"].exclude("tests/gc_test.rb")
+end
+
+# gc_test needs to be split out to ensure the generated file hasn't been
+# imported by other tests.
+Rake::TestTask.new(:gc_test => :build) do |t|
+  t.test_files = FileList["tests/gc_test.rb"]
 end
 
 task :build => [:clean, :compile, :genproto]
diff --git a/ruby/compatibility_tests/v3.0.0/tests/basic.rb b/ruby/compatibility_tests/v3.0.0/tests/basic.rb
index f81e456c..05fe0278 100644
--- a/ruby/compatibility_tests/v3.0.0/tests/basic.rb
+++ b/ruby/compatibility_tests/v3.0.0/tests/basic.rb
@@ -600,7 +600,7 @@ module BasicTest
       assert_raise RangeError do
         m["z"] = :Z
       end
-      assert_raise TypeError do
+      assert_raise RangeError do
         m["z"] = "z"
       end
     end
diff --git a/ruby/ext/google/protobuf_c/defs.c b/ruby/ext/google/protobuf_c/defs.c
index 845c0225..d9d2ebac 100644
--- a/ruby/ext/google/protobuf_c/defs.c
+++ b/ruby/ext/google/protobuf_c/defs.c
@@ -76,7 +76,7 @@ static upb_enumdef* check_enum_notfrozen(const upb_enumdef* def) {
 // -----------------------------------------------------------------------------
 
 #define DEFINE_CLASS(name, string_name)                             \
-    VALUE c ## name;                                                \
+    VALUE c ## name = Qnil;                                         \
     const rb_data_type_t _ ## name ## _type = {                     \
       string_name,                                                  \
       { name ## _mark, name ## _free, NULL },                       \
@@ -126,11 +126,11 @@ void DescriptorPool_register(VALUE module) {
   rb_define_method(klass, "lookup", DescriptorPool_lookup, 1);
   rb_define_singleton_method(klass, "generated_pool",
                              DescriptorPool_generated_pool, 0);
-  cDescriptorPool = klass;
   rb_gc_register_address(&cDescriptorPool);
+  cDescriptorPool = klass;
 
-  generated_pool = rb_class_new_instance(0, NULL, klass);
   rb_gc_register_address(&generated_pool);
+  generated_pool = rb_class_new_instance(0, NULL, klass);
 }
 
 static void add_descriptor_to_pool(DescriptorPool* self,
@@ -228,7 +228,6 @@ DEFINE_CLASS(Descriptor, "Google::Protobuf::Descriptor");
 void Descriptor_mark(void* _self) {
   Descriptor* self = _self;
   rb_gc_mark(self->klass);
-  rb_gc_mark(self->typeclass_references);
 }
 
 void Descriptor_free(void* _self) {
@@ -283,7 +282,6 @@ VALUE Descriptor_alloc(VALUE klass) {
   self->pb_serialize_handlers = NULL;
   self->json_serialize_handlers = NULL;
   self->json_serialize_handlers_preserve = NULL;
-  self->typeclass_references = rb_ary_new();
   return ret;
 }
 
@@ -301,8 +299,8 @@ void Descriptor_register(VALUE module) {
   rb_define_method(klass, "name", Descriptor_name, 0);
   rb_define_method(klass, "name=", Descriptor_name_set, 1);
   rb_include_module(klass, rb_mEnumerable);
-  cDescriptor = klass;
   rb_gc_register_address(&cDescriptor);
+  cDescriptor = klass;
 }
 
 /*
@@ -520,8 +518,8 @@ void FieldDescriptor_register(VALUE module) {
   rb_define_method(klass, "subtype", FieldDescriptor_subtype, 0);
   rb_define_method(klass, "get", FieldDescriptor_get, 1);
   rb_define_method(klass, "set", FieldDescriptor_set, 2);
-  cFieldDescriptor = klass;
   rb_gc_register_address(&cFieldDescriptor);
+  cFieldDescriptor = klass;
 }
 
 /*
@@ -918,8 +916,8 @@ void OneofDescriptor_register(VALUE module) {
   rb_define_method(klass, "add_field", OneofDescriptor_add_field, 1);
   rb_define_method(klass, "each", OneofDescriptor_each, 0);
   rb_include_module(klass, rb_mEnumerable);
-  cOneofDescriptor = klass;
   rb_gc_register_address(&cOneofDescriptor);
+  cOneofDescriptor = klass;
 }
 
 /*
@@ -1039,8 +1037,8 @@ void EnumDescriptor_register(VALUE module) {
   rb_define_method(klass, "each", EnumDescriptor_each, 0);
   rb_define_method(klass, "enummodule", EnumDescriptor_enummodule, 0);
   rb_include_module(klass, rb_mEnumerable);
-  cEnumDescriptor = klass;
   rb_gc_register_address(&cEnumDescriptor);
+  cEnumDescriptor = klass;
 }
 
 /*
@@ -1204,8 +1202,8 @@ void MessageBuilderContext_register(VALUE module) {
   rb_define_method(klass, "repeated", MessageBuilderContext_repeated, -1);
   rb_define_method(klass, "map", MessageBuilderContext_map, -1);
   rb_define_method(klass, "oneof", MessageBuilderContext_oneof, 1);
-  cMessageBuilderContext = klass;
   rb_gc_register_address(&cMessageBuilderContext);
+  cMessageBuilderContext = klass;
 }
 
 /*
@@ -1493,8 +1491,8 @@ void OneofBuilderContext_register(VALUE module) {
   rb_define_method(klass, "initialize",
                    OneofBuilderContext_initialize, 2);
   rb_define_method(klass, "optional", OneofBuilderContext_optional, -1);
-  cOneofBuilderContext = klass;
   rb_gc_register_address(&cOneofBuilderContext);
+  cOneofBuilderContext = klass;
 }
 
 /*
@@ -1571,8 +1569,8 @@ void EnumBuilderContext_register(VALUE module) {
   rb_define_method(klass, "initialize",
                    EnumBuilderContext_initialize, 1);
   rb_define_method(klass, "value", EnumBuilderContext_value, 2);
-  cEnumBuilderContext = klass;
   rb_gc_register_address(&cEnumBuilderContext);
+  cEnumBuilderContext = klass;
 }
 
 /*
@@ -1635,7 +1633,7 @@ VALUE Builder_alloc(VALUE klass) {
   Builder* self = ALLOC(Builder);
   VALUE ret = TypedData_Wrap_Struct(
       klass, &_Builder_type, self);
-  self->pending_list = rb_ary_new();
+  self->pending_list = Qnil;
   self->defs = NULL;
   return ret;
 }
@@ -1645,9 +1643,22 @@ void Builder_register(VALUE module) {
   rb_define_alloc_func(klass, Builder_alloc);
   rb_define_method(klass, "add_message", Builder_add_message, 1);
   rb_define_method(klass, "add_enum", Builder_add_enum, 1);
+  rb_define_method(klass, "initialize", Builder_initialize, 0);
   rb_define_method(klass, "finalize_to_pool", Builder_finalize_to_pool, 1);
-  cBuilder = klass;
   rb_gc_register_address(&cBuilder);
+  cBuilder = klass;
+}
+
+/*
+ * call-seq:
+ *     Builder.new(d) => builder
+ *
+ * Create a new message builder.
+ */
+VALUE Builder_initialize(VALUE _self) {
+  DEFINE_SELF(Builder, self, _self);
+  self->pending_list = rb_ary_new();
+  return Qnil;
 }
 
 /*
diff --git a/ruby/ext/google/protobuf_c/encode_decode.c b/ruby/ext/google/protobuf_c/encode_decode.c
index d86a1145..12080d03 100644
--- a/ruby/ext/google/protobuf_c/encode_decode.c
+++ b/ruby/ext/google/protobuf_c/encode_decode.c
@@ -44,6 +44,56 @@ VALUE noleak_rb_str_cat(VALUE rb_str, const char *str, long len) {
   return rb_str;
 }
 
+// The code below also comes from upb's prototype Ruby binding, developed by
+// haberman@.
+
+/* stringsink *****************************************************************/
+
+static void *stringsink_start(void *_sink, const void *hd, size_t size_hint) {
+  stringsink *sink = _sink;
+  sink->len = 0;
+  return sink;
+}
+
+static size_t stringsink_string(void *_sink, const void *hd, const char *ptr,
+                                size_t len, const upb_bufhandle *handle) {
+  stringsink *sink = _sink;
+  size_t new_size = sink->size;
+
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+
+  while (sink->len + len > new_size) {
+    new_size *= 2;
+  }
+
+  if (new_size != sink->size) {
+    sink->ptr = realloc(sink->ptr, new_size);
+    sink->size = new_size;
+  }
+
+  memcpy(sink->ptr + sink->len, ptr, len);
+  sink->len += len;
+
+  return len;
+}
+
+void stringsink_init(stringsink *sink) {
+  upb_byteshandler_init(&sink->handler);
+  upb_byteshandler_setstartstr(&sink->handler, stringsink_start, NULL);
+  upb_byteshandler_setstring(&sink->handler, stringsink_string, NULL);
+
+  upb_bytessink_reset(&sink->sink, &sink->handler, sink);
+
+  sink->size = 32;
+  sink->ptr = malloc(sink->size);
+  sink->len = 0;
+}
+
+void stringsink_uninit(stringsink *sink) {
+  free(sink->ptr);
+}
+
 // -----------------------------------------------------------------------------
 // Parsing.
 // -----------------------------------------------------------------------------
@@ -280,11 +330,6 @@ rb_data_type_t MapParseFrame_type = {
   { MapParseFrame_mark, MapParseFrame_free, NULL },
 };
 
-// Array of Ruby objects wrapping map_parse_frame_t.
-// We don't allow multiple concurrent decodes, so we assume that this global
-// variable is specific to the "current" decode.
-VALUE map_parse_frames;
-
 static map_parse_frame_t* map_push_frame(VALUE map,
                                          const map_handlerdata_t* handlerdata) {
   map_parse_frame_t* frame = ALLOC(map_parse_frame_t);
@@ -293,16 +338,12 @@ static map_parse_frame_t* map_push_frame(VALUE map,
   native_slot_init(handlerdata->key_field_type, &frame->key_storage);
   native_slot_init(handlerdata->value_field_type, &frame->value_storage);
 
-  rb_ary_push(map_parse_frames,
+  Map_set_frame(map,
               TypedData_Wrap_Struct(rb_cObject, &MapParseFrame_type, frame));
 
   return frame;
 }
 
-static void map_pop_frame() {
-  rb_ary_pop(map_parse_frames);
-}
-
 // Handler to begin a map entry: allocates a temporary frame. This is the
 // 'startsubmsg' handler on the msgdef that contains the map field.
 static void *startmapentry_handler(void *closure, const void *hd) {
@@ -336,7 +377,7 @@ static bool endmap_handler(void *closure, const void *hd, upb_status* s) {
       &frame->value_storage);
 
   Map_index_set(frame->map, key, value);
-  map_pop_frame();
+  Map_set_frame(frame->map, Qnil);
 
   return true;
 }
@@ -622,6 +663,20 @@ static void add_handlers_for_oneof_field(upb_handlers *h,
   upb_handlerattr_uninit(&attr);
 }
 
+static bool unknown_field_handler(void* closure, const void* hd,
+                                  const char* buf, size_t size) {
+  UPB_UNUSED(hd);
+
+  MessageHeader* msg = (MessageHeader*)closure;
+  if (msg->unknown_fields == NULL) {
+    msg->unknown_fields = malloc(sizeof(stringsink));
+    stringsink_init(msg->unknown_fields);
+  }
+
+  stringsink_string(msg->unknown_fields, NULL, buf, size, NULL);
+
+  return true;
+}
 
 static void add_handlers_for_message(const void *closure, upb_handlers *h) {
   const upb_msgdef* msgdef = upb_handlers_msgdef(h);
@@ -643,6 +698,9 @@ static void add_handlers_for_message(const void *closure, upb_handlers *h) {
     desc->layout = create_layout(desc->msgdef);
   }
 
+  upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;
+  upb_handlers_setunknown(h, unknown_field_handler, &attr);
+
   for (upb_msg_field_begin(&i, desc->msgdef);
        !upb_msg_field_done(&i);
        upb_msg_field_next(&i)) {
@@ -775,10 +833,6 @@ VALUE Message_decode(VALUE klass, VALUE data) {
   msg_rb = rb_class_new_instance(0, NULL, msgklass);
   TypedData_Get_Struct(msg_rb, MessageHeader, &Message_type, msg);
 
-  // We generally expect this to be clear already, but clear it in case parsing
-  // previously got interrupted somehow.
-  rb_ary_clear(map_parse_frames);
-
   {
     const upb_pbdecodermethod* method = msgdef_decodermethod(desc);
     const upb_handlers* h = upb_pbdecodermethod_desthandlers(method);
@@ -823,10 +877,6 @@ VALUE Message_decode_json(VALUE klass, VALUE data) {
   msg_rb = rb_class_new_instance(0, NULL, msgklass);
   TypedData_Get_Struct(msg_rb, MessageHeader, &Message_type, msg);
 
-  // We generally expect this to be clear already, but clear it in case parsing
-  // previously got interrupted somehow.
-  rb_ary_clear(map_parse_frames);
-
   {
     const upb_json_parsermethod* method = msgdef_jsonparsermethod(desc);
     stackenv se;
@@ -848,65 +898,6 @@ VALUE Message_decode_json(VALUE klass, VALUE data) {
 // -----------------------------------------------------------------------------
 // Serializing.
 // -----------------------------------------------------------------------------
-//
-// The code below also comes from upb's prototype Ruby binding, developed by
-// haberman@.
-
-/* stringsink *****************************************************************/
-
-// This should probably be factored into a common upb component.
-
-typedef struct {
-  upb_byteshandler handler;
-  upb_bytessink sink;
-  char *ptr;
-  size_t len, size;
-} stringsink;
-
-static void *stringsink_start(void *_sink, const void *hd, size_t size_hint) {
-  stringsink *sink = _sink;
-  sink->len = 0;
-  return sink;
-}
-
-static size_t stringsink_string(void *_sink, const void *hd, const char *ptr,
-                                size_t len, const upb_bufhandle *handle) {
-  stringsink *sink = _sink;
-  size_t new_size = sink->size;
-
-  UPB_UNUSED(hd);
-  UPB_UNUSED(handle);
-
-  while (sink->len + len > new_size) {
-    new_size *= 2;
-  }
-
-  if (new_size != sink->size) {
-    sink->ptr = realloc(sink->ptr, new_size);
-    sink->size = new_size;
-  }
-
-  memcpy(sink->ptr + sink->len, ptr, len);
-  sink->len += len;
-
-  return len;
-}
-
-void stringsink_init(stringsink *sink) {
-  upb_byteshandler_init(&sink->handler);
-  upb_byteshandler_setstartstr(&sink->handler, stringsink_start, NULL);
-  upb_byteshandler_setstring(&sink->handler, stringsink_string, NULL);
-
-  upb_bytessink_reset(&sink->sink, &sink->handler, sink);
-
-  sink->size = 32;
-  sink->ptr = malloc(sink->size);
-  sink->len = 0;
-}
-
-void stringsink_uninit(stringsink *sink) {
-  free(sink->ptr);
-}
 
 /* msgvisitor *****************************************************************/
 
@@ -914,13 +905,9 @@ void stringsink_uninit(stringsink *sink) {
 // semantics, which means that we have true field presence, we will want to
 // modify msgvisitor so that it emits all present fields rather than all
 // non-default-value fields.
-//
-// Likewise, when implementing JSON serialization, we may need to have a
-// 'verbose' mode that outputs all fields and a 'concise' mode that outputs only
-// those with non-default values.
 
 static void putmsg(VALUE msg, const Descriptor* desc,
-                   upb_sink *sink, int depth);
+                   upb_sink *sink, int depth, bool emit_defaults);
 
 static upb_selector_t getsel(const upb_fielddef *f, upb_handlertype_t type) {
   upb_selector_t ret;
@@ -952,7 +939,7 @@ static void putstr(VALUE str, const upb_fielddef *f, upb_sink *sink) {
 }
 
 static void putsubmsg(VALUE submsg, const upb_fielddef *f, upb_sink *sink,
-                      int depth) {
+                      int depth, bool emit_defaults) {
   upb_sink subsink;
   VALUE descriptor;
   Descriptor* subdesc;
@@ -963,12 +950,12 @@ static void putsubmsg(VALUE submsg, const upb_fielddef *f, upb_sink *sink,
   subdesc = ruby_to_Descriptor(descriptor);
 
   upb_sink_startsubmsg(sink, getsel(f, UPB_HANDLER_STARTSUBMSG), &subsink);
-  putmsg(submsg, subdesc, &subsink, depth + 1);
+  putmsg(submsg, subdesc, &subsink, depth + 1, emit_defaults);
   upb_sink_endsubmsg(sink, getsel(f, UPB_HANDLER_ENDSUBMSG));
 }
 
 static void putary(VALUE ary, const upb_fielddef *f, upb_sink *sink,
-                   int depth) {
+                   int depth, bool emit_defaults) {
   upb_sink subsink;
   upb_fieldtype_t type = upb_fielddef_type(f);
   upb_selector_t sel = 0;
@@ -1005,7 +992,7 @@ static void putary(VALUE ary, const upb_fielddef *f, upb_sink *sink,
         putstr(*((VALUE *)memory), f, &subsink);
         break;
       case UPB_TYPE_MESSAGE:
-        putsubmsg(*((VALUE *)memory), f, &subsink, depth);
+        putsubmsg(*((VALUE *)memory), f, &subsink, depth, emit_defaults);
         break;
 
 #undef T
@@ -1019,7 +1006,8 @@ static void put_ruby_value(VALUE value,
                            const upb_fielddef *f,
                            VALUE type_class,
                            int depth,
-                           upb_sink *sink) {
+                           upb_sink *sink,
+                           bool emit_defaults) {
   upb_selector_t sel = 0;
   if (upb_fielddef_isprimitive(f)) {
     sel = getsel(f, upb_handlers_getprimitivehandlertype(f));
@@ -1059,12 +1047,12 @@ static void put_ruby_value(VALUE value,
       putstr(value, f, sink);
       break;
     case UPB_TYPE_MESSAGE:
-      putsubmsg(value, f, sink, depth);
+      putsubmsg(value, f, sink, depth, emit_defaults);
   }
 }
 
 static void putmap(VALUE map, const upb_fielddef *f, upb_sink *sink,
-                   int depth) {
+                   int depth, bool emit_defaults) {
   Map* self;
   upb_sink subsink;
   const upb_fielddef* key_field;
@@ -1090,9 +1078,9 @@ static void putmap(VALUE map, const upb_fielddef *f, upb_sink *sink,
                          &entry_sink);
     upb_sink_startmsg(&entry_sink);
 
-    put_ruby_value(key, key_field, Qnil, depth + 1, &entry_sink);
+    put_ruby_value(key, key_field, Qnil, depth + 1, &entry_sink, emit_defaults);
     put_ruby_value(value, value_field, self->value_type_class, depth + 1,
-                   &entry_sink);
+                   &entry_sink, emit_defaults);
 
     upb_sink_endmsg(&entry_sink, &status);
     upb_sink_endsubmsg(&subsink, getsel(f, UPB_HANDLER_ENDSUBMSG));
@@ -1102,7 +1090,7 @@ static void putmap(VALUE map, const upb_fielddef *f, upb_sink *sink,
 }
 
 static void putmsg(VALUE msg_rb, const Descriptor* desc,
-                   upb_sink *sink, int depth) {
+                   upb_sink *sink, int depth, bool emit_defaults) {
   MessageHeader* msg;
   upb_msg_field_iter i;
   upb_status status;
@@ -1144,31 +1132,31 @@ static void putmsg(VALUE msg_rb, const Descriptor* desc,
 
     if (is_map_field(f)) {
       VALUE map = DEREF(msg, offset, VALUE);
-      if (map != Qnil) {
-        putmap(map, f, sink, depth);
+      if (map != Qnil || emit_defaults) {
+        putmap(map, f, sink, depth, emit_defaults);
       }
     } else if (upb_fielddef_isseq(f)) {
       VALUE ary = DEREF(msg, offset, VALUE);
       if (ary != Qnil) {
-        putary(ary, f, sink, depth);
+        putary(ary, f, sink, depth, emit_defaults);
       }
     } else if (upb_fielddef_isstring(f)) {
       VALUE str = DEREF(msg, offset, VALUE);
-      if (is_matching_oneof || RSTRING_LEN(str) > 0) {
+      if (is_matching_oneof || emit_defaults || RSTRING_LEN(str) > 0) {
         putstr(str, f, sink);
       }
     } else if (upb_fielddef_issubmsg(f)) {
-      putsubmsg(DEREF(msg, offset, VALUE), f, sink, depth);
+      putsubmsg(DEREF(msg, offset, VALUE), f, sink, depth, emit_defaults);
     } else {
       upb_selector_t sel = getsel(f, upb_handlers_getprimitivehandlertype(f));
 
-#define T(upbtypeconst, upbtype, ctype, default_value)                \
-  case upbtypeconst: {                                                \
-      ctype value = DEREF(msg, offset, ctype);                        \
-      if (is_matching_oneof || value != default_value) {              \
-        upb_sink_put##upbtype(sink, sel, value);                      \
-      }                                                               \
-    }                                                                 \
+#define T(upbtypeconst, upbtype, ctype, default_value)                    \
+  case upbtypeconst: {                                                    \
+      ctype value = DEREF(msg, offset, ctype);                            \
+      if (is_matching_oneof || emit_defaults || value != default_value) { \
+        upb_sink_put##upbtype(sink, sel, value);                          \
+      }                                                                   \
+    }                                                                     \
     break;
 
       switch (upb_fielddef_type(f)) {
@@ -1191,6 +1179,11 @@ static void putmsg(VALUE msg_rb, const Descriptor* desc,
     }
   }
 
+  stringsink* unknown = msg->unknown_fields;
+  if (unknown != NULL) {
+    upb_sink_putunknown(sink, unknown->ptr, unknown->len);
+  }
+
   upb_sink_endmsg(sink, &status);
 }
 
@@ -1246,7 +1239,7 @@ VALUE Message_encode(VALUE klass, VALUE msg_rb) {
     stackenv_init(&se, "Error occurred during encoding: %s");
     encoder = upb_pb_encoder_create(&se.env, serialize_handlers, &sink.sink);
 
-    putmsg(msg_rb, desc, upb_pb_encoder_input(encoder), 0);
+    putmsg(msg_rb, desc, upb_pb_encoder_input(encoder), 0, false);
 
     ret = rb_str_new(sink.ptr, sink.len);
 
@@ -1268,6 +1261,7 @@ VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass) {
   Descriptor* desc = ruby_to_Descriptor(descriptor);
   VALUE msg_rb;
   VALUE preserve_proto_fieldnames = Qfalse;
+  VALUE emit_defaults = Qfalse;
   stringsink sink;
 
   if (argc < 1 || argc > 2) {
@@ -1283,6 +1277,9 @@ VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass) {
     }
     preserve_proto_fieldnames = rb_hash_lookup2(
         hash_args, ID2SYM(rb_intern("preserve_proto_fieldnames")), Qfalse);
+
+    emit_defaults = rb_hash_lookup2(
+        hash_args, ID2SYM(rb_intern("emit_defaults")), Qfalse);
   }
 
   stringsink_init(&sink);
@@ -1297,7 +1294,7 @@ VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass) {
     stackenv_init(&se, "Error occurred during encoding: %s");
     printer = upb_json_printer_create(&se.env, serialize_handlers, &sink.sink);
 
-    putmsg(msg_rb, desc, upb_json_printer_input(printer), 0);
+    putmsg(msg_rb, desc, upb_json_printer_input(printer), 0, RTEST(emit_defaults));
 
     ret = rb_enc_str_new(sink.ptr, sink.len, rb_utf8_encoding());
 
@@ -1308,3 +1305,91 @@ VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass) {
   }
 }
 
+static void discard_unknown(VALUE msg_rb, const Descriptor* desc) {
+  MessageHeader* msg;
+  upb_msg_field_iter it;
+
+  TypedData_Get_Struct(msg_rb, MessageHeader, &Message_type, msg);
+
+  stringsink* unknown = msg->unknown_fields;
+  if (unknown != NULL) {
+    stringsink_uninit(unknown);
+    msg->unknown_fields = NULL;
+  }
+
+  for (upb_msg_field_begin(&it, desc->msgdef);
+       !upb_msg_field_done(&it);
+       upb_msg_field_next(&it)) {
+    upb_fielddef *f = upb_msg_iter_field(&it);
+    uint32_t offset =
+        desc->layout->fields[upb_fielddef_index(f)].offset +
+        sizeof(MessageHeader);
+
+    if (upb_fielddef_containingoneof(f)) {
+      uint32_t oneof_case_offset =
+          desc->layout->fields[upb_fielddef_index(f)].case_offset +
+          sizeof(MessageHeader);
+      // For a oneof, check that this field is actually present -- skip all the
+      // below if not.
+      if (DEREF(msg, oneof_case_offset, uint32_t) !=
+          upb_fielddef_number(f)) {
+        continue;
+      }
+      // Otherwise, fall through to the appropriate singular-field handler
+      // below.
+    }
+
+    if (!upb_fielddef_issubmsg(f)) {
+      continue;
+    }
+
+    if (is_map_field(f)) {
+      if (!upb_fielddef_issubmsg(map_field_value(f))) continue;
+      VALUE map = DEREF(msg, offset, VALUE);
+      if (map == Qnil) continue;
+      Map_iter map_it;
+      for (Map_begin(map, &map_it); !Map_done(&map_it); Map_next(&map_it)) {
+        VALUE submsg = Map_iter_value(&map_it);
+        VALUE descriptor = rb_ivar_get(submsg, descriptor_instancevar_interned);
+        const Descriptor* subdesc = ruby_to_Descriptor(descriptor);
+        discard_unknown(submsg, subdesc);
+      }
+    } else if (upb_fielddef_isseq(f)) {
+      VALUE ary = DEREF(msg, offset, VALUE);
+      if (ary == Qnil) continue;
+      int size = NUM2INT(RepeatedField_length(ary));
+      for (int i = 0; i < size; i++) {
+        void* memory = RepeatedField_index_native(ary, i);
+        VALUE submsg = *((VALUE *)memory);
+        VALUE descriptor = rb_ivar_get(submsg, descriptor_instancevar_interned);
+        const Descriptor* subdesc = ruby_to_Descriptor(descriptor);
+        discard_unknown(submsg, subdesc);
+      }
+    } else {
+      VALUE submsg = DEREF(msg, offset, VALUE);
+      if (submsg == Qnil) continue;
+      VALUE descriptor = rb_ivar_get(submsg, descriptor_instancevar_interned);
+      const Descriptor* subdesc = ruby_to_Descriptor(descriptor);
+      discard_unknown(submsg, subdesc);
+    }
+  }
+}
+
+/*
+ * call-seq:
+ *     Google::Protobuf.discard_unknown(msg)
+ *
+ * Discard unknown fields in the given message object and recursively discard
+ * unknown fields in submessages.
+ */
+VALUE Google_Protobuf_discard_unknown(VALUE self, VALUE msg_rb) {
+  VALUE klass = CLASS_OF(msg_rb);
+  VALUE descriptor = rb_ivar_get(klass, descriptor_instancevar_interned);
+  Descriptor* desc = ruby_to_Descriptor(descriptor);
+  if (klass == cRepeatedField || klass == cMap) {
+    rb_raise(rb_eArgError, "Expected proto msg for discard unknown.");
+  } else {
+    discard_unknown(msg_rb, desc);
+  }
+  return Qnil;
+}
diff --git a/ruby/ext/google/protobuf_c/extconf.rb b/ruby/ext/google/protobuf_c/extconf.rb
index b368dcc6..0886e607 100644
--- a/ruby/ext/google/protobuf_c/extconf.rb
+++ b/ruby/ext/google/protobuf_c/extconf.rb
@@ -4,7 +4,14 @@ require 'mkmf'
 
 $CFLAGS += " -std=c99 -O3 -DNDEBUG"
 
+
+if RUBY_PLATFORM =~ /linux/
+  # Instruct the linker to point memcpy calls at our __wrap_memcpy wrapper.
+  $LDFLAGS += " -Wl,-wrap,memcpy"
+end
+
 $objs = ["protobuf.o", "defs.o", "storage.o", "message.o",
-         "repeated_field.o", "map.o", "encode_decode.o", "upb.o"]
+         "repeated_field.o", "map.o", "encode_decode.o", "upb.o",
+         "wrap_memcpy.o"]
 
 create_makefile("google/protobuf_c")
diff --git a/ruby/ext/google/protobuf_c/map.c b/ruby/ext/google/protobuf_c/map.c
index 12f1f9dd..8c2f6424 100644
--- a/ruby/ext/google/protobuf_c/map.c
+++ b/ruby/ext/google/protobuf_c/map.c
@@ -146,6 +146,7 @@ void Map_mark(void* _self) {
   Map* self = _self;
 
   rb_gc_mark(self->value_type_class);
+  rb_gc_mark(self->parse_frame);
 
   if (self->value_type == UPB_TYPE_STRING ||
       self->value_type == UPB_TYPE_BYTES ||
@@ -174,6 +175,12 @@ VALUE Map_alloc(VALUE klass) {
   return TypedData_Wrap_Struct(klass, &Map_type, self);
 }
 
+VALUE Map_set_frame(VALUE map, VALUE val) {
+  Map* self = ruby_to_Map(map);
+  self->parse_frame = val;
+  return val;
+}
+
 static bool needs_typeclass(upb_fieldtype_t type) {
   switch (type) {
     case UPB_TYPE_MESSAGE:
@@ -227,6 +234,7 @@ VALUE Map_init(int argc, VALUE* argv, VALUE _self) {
 
   self->key_type = ruby_to_fieldtype(argv[0]);
   self->value_type = ruby_to_fieldtype(argv[1]);
+  self->parse_frame = Qnil;
 
   // Check that the key type is an allowed type.
   switch (self->key_type) {
@@ -654,6 +662,35 @@ VALUE Map_hash(VALUE _self) {
 
 /*
  * call-seq:
+ *     Map.to_h => {}
+ *
+ * Returns a Ruby Hash object containing all the values within the map
+ */
+VALUE Map_to_h(VALUE _self) {
+  Map* self = ruby_to_Map(_self);
+  VALUE hash = rb_hash_new();
+  upb_strtable_iter it;
+  for (upb_strtable_begin(&it, &self->table);
+       !upb_strtable_done(&it);
+       upb_strtable_next(&it)) {
+    VALUE key = table_key_to_ruby(
+        self, upb_strtable_iter_key(&it), upb_strtable_iter_keylength(&it));
+    upb_value v = upb_strtable_iter_value(&it);
+    void* mem = value_memory(&v);
+    VALUE value = native_slot_get(self->value_type,
+                                  self->value_type_class,
+                                  mem);
+
+    if (self->value_type == UPB_TYPE_MESSAGE) {
+      value = Message_to_h(value);
+    }
+    rb_hash_aset(hash, key, value);
+  }
+  return hash;
+}
+
+/*
+ * call-seq:
  *     Map.inspect => string
  *
  * Returns a string representing this map's elements. It will be formatted as
@@ -788,8 +825,8 @@ VALUE Map_iter_value(Map_iter* iter) {
 void Map_register(VALUE module) {
   VALUE klass = rb_define_class_under(module, "Map", rb_cObject);
   rb_define_alloc_func(klass, Map_alloc);
-  cMap = klass;
   rb_gc_register_address(&cMap);
+  cMap = klass;
 
   rb_define_method(klass, "initialize", Map_init, -1);
   rb_define_method(klass, "each", Map_each, 0);
@@ -804,6 +841,8 @@ void Map_register(VALUE module) {
   rb_define_method(klass, "dup", Map_dup, 0);
   rb_define_method(klass, "==", Map_eq, 1);
   rb_define_method(klass, "hash", Map_hash, 0);
+  rb_define_method(klass, "to_hash", Map_to_h, 0);
+  rb_define_method(klass, "to_h", Map_to_h, 0);
   rb_define_method(klass, "inspect", Map_inspect, 0);
   rb_define_method(klass, "merge", Map_merge, 1);
   rb_include_module(klass, rb_mEnumerable);
diff --git a/ruby/ext/google/protobuf_c/message.c b/ruby/ext/google/protobuf_c/message.c
index 837a974b..63a61baf 100644
--- a/ruby/ext/google/protobuf_c/message.c
+++ b/ruby/ext/google/protobuf_c/message.c
@@ -44,6 +44,11 @@ void Message_mark(void* _self) {
 }
 
 void Message_free(void* self) {
+  stringsink* unknown = ((MessageHeader *)self)->unknown_fields;
+  if (unknown != NULL) {
+    stringsink_uninit(unknown);
+    free(unknown);
+  }
   xfree(self);
 }
 
@@ -67,6 +72,8 @@ VALUE Message_alloc(VALUE klass) {
   msg->descriptor = desc;
   rb_ivar_set(ret, descriptor_instancevar_interned, descriptor);
 
+  msg->unknown_fields = NULL;
+
   layout_init(desc->layout, Message_data(msg));
 
   return ret;
@@ -217,20 +224,32 @@ VALUE Message_respond_to_missing(int argc, VALUE* argv, VALUE _self) {
   return Qtrue;
 }
 
+VALUE create_submsg_from_hash(const upb_fielddef *f, VALUE hash) {
+  const upb_def *d = upb_fielddef_subdef(f);
+  assert(d != NULL);
+
+  VALUE descriptor = get_def_obj(d);
+  VALUE msgclass = rb_funcall(descriptor, rb_intern("msgclass"), 0, NULL);
+
+  VALUE args[1] = { hash };
+  return rb_class_new_instance(1, args, msgclass);
+}
+
 int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
   MessageHeader* self;
-  VALUE method_str;
-  char* name;
+  char *name;
   const upb_fielddef* f;
   TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
 
-  if (!SYMBOL_P(key)) {
+  if (TYPE(key) == T_STRING) {
+    name = RSTRING_PTR(key);
+  } else if (TYPE(key) == T_SYMBOL) {
+    name = RSTRING_PTR(rb_id2str(SYM2ID(key)));
+  } else {
     rb_raise(rb_eArgError,
-             "Expected symbols as hash keys in initialization map.");
+             "Expected string or symbols as hash keys when initializing proto from hash.");
   }
 
-  method_str = rb_id2str(SYM2ID(key));
-  name = RSTRING_PTR(method_str);
   f = upb_msgdef_ntofz(self->descriptor->msgdef, name);
   if (f == NULL) {
     rb_raise(rb_eArgError,
@@ -255,9 +274,18 @@ int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
     }
     ary = layout_get(self->descriptor->layout, Message_data(self), f);
     for (int i = 0; i < RARRAY_LEN(val); i++) {
-      RepeatedField_push(ary, rb_ary_entry(val, i));
+      VALUE entry = rb_ary_entry(val, i);
+      if (TYPE(entry) == T_HASH && upb_fielddef_issubmsg(f)) {
+        entry = create_submsg_from_hash(f, entry);
+      }
+
+      RepeatedField_push(ary, entry);
     }
   } else {
+    if (TYPE(val) == T_HASH && upb_fielddef_issubmsg(f)) {
+      val = create_submsg_from_hash(f, val);
+    }
+
     layout_set(self->descriptor->layout, Message_data(self), f, val);
   }
   return 0;
@@ -394,7 +422,12 @@ VALUE Message_inspect(VALUE _self) {
   return str;
 }
 
-
+/*
+ * call-seq:
+ *     Message.to_h => {}
+ *
+ * Returns the message as a Ruby Hash object, with keys as symbols.
+ */
 VALUE Message_to_h(VALUE _self) {
   MessageHeader* self;
   VALUE hash;
@@ -410,8 +443,20 @@ VALUE Message_to_h(VALUE _self) {
     VALUE msg_value = layout_get(self->descriptor->layout, Message_data(self),
                                  field);
     VALUE msg_key   = ID2SYM(rb_intern(upb_fielddef_name(field)));
-    if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
+    if (upb_fielddef_ismap(field)) {
+      msg_value = Map_to_h(msg_value);
+    } else if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
       msg_value = RepeatedField_to_ary(msg_value);
+
+      if (upb_fielddef_type(field) == UPB_TYPE_MESSAGE) {
+        for (int i = 0; i < RARRAY_LEN(msg_value); i++) {
+          VALUE elem = rb_ary_entry(msg_value, i);
+          rb_ary_store(msg_value, i, Message_to_h(elem));
+        }
+      }
+    } else if (msg_value != Qnil &&
+               upb_fielddef_type(field) == UPB_TYPE_MESSAGE) {
+      msg_value = Message_to_h(msg_value);
     }
     rb_hash_aset(hash, msg_key, msg_value);
   }
@@ -495,9 +540,9 @@ VALUE build_class_from_descriptor(Descriptor* desc) {
               get_def_obj(desc->msgdef));
   rb_define_alloc_func(klass, Message_alloc);
   rb_require("google/protobuf/message_exts");
-  rb_include_module(klass, rb_eval_string("Google::Protobuf::MessageExts"));
+  rb_include_module(klass, rb_eval_string("::Google::Protobuf::MessageExts"));
   rb_extend_object(
-      klass, rb_eval_string("Google::Protobuf::MessageExts::ClassMethods"));
+      klass, rb_eval_string("::Google::Protobuf::MessageExts::ClassMethods"));
 
   rb_define_method(klass, "method_missing",
                    Message_method_missing, -1);
diff --git a/ruby/ext/google/protobuf_c/protobuf.c b/ruby/ext/google/protobuf_c/protobuf.c
index 98963667..db696426 100644
--- a/ruby/ext/google/protobuf_c/protobuf.c
+++ b/ruby/ext/google/protobuf_c/protobuf.c
@@ -103,6 +103,8 @@ void Init_protobuf_c() {
   cError = rb_const_get(protobuf, rb_intern("Error"));
   cParseError = rb_const_get(protobuf, rb_intern("ParseError"));
 
+  rb_define_singleton_method(protobuf, "discard_unknown",
+                             Google_Protobuf_discard_unknown, 1);
   rb_define_singleton_method(protobuf, "deep_copy",
                              Google_Protobuf_deep_copy, 1);
 
@@ -110,8 +112,6 @@ void Init_protobuf_c() {
   kRubyStringASCIIEncoding = rb_usascii_encoding();
   kRubyString8bitEncoding = rb_ascii8bit_encoding();
 
-  upb_def_to_ruby_obj_map = rb_hash_new();
   rb_gc_register_address(&upb_def_to_ruby_obj_map);
-  map_parse_frames = rb_ary_new();
-  rb_gc_register_address(&map_parse_frames);
+  upb_def_to_ruby_obj_map = rb_hash_new();
 }
diff --git a/ruby/ext/google/protobuf_c/protobuf.h b/ruby/ext/google/protobuf_c/protobuf.h
index d5ced567..5266aa8d 100644
--- a/ruby/ext/google/protobuf_c/protobuf.h
+++ b/ruby/ext/google/protobuf_c/protobuf.h
@@ -116,10 +116,6 @@ struct Descriptor {
   const upb_handlers* pb_serialize_handlers;
   const upb_handlers* json_serialize_handlers;
   const upb_handlers* json_serialize_handlers_preserve;
-  // Handlers hold type class references for sub-message fields directly in some
-  // cases. We need to keep these rooted because they might otherwise be
-  // collected.
-  VALUE typeclass_references;
 };
 
 struct FieldDescriptor {
@@ -166,8 +162,6 @@ extern VALUE cBuilder;
 extern VALUE cError;
 extern VALUE cParseError;
 
-extern VALUE map_parse_frames;
-
 // We forward-declare all of the Ruby method implementations here because we
 // sometimes call the methods directly across .c files, rather than going
 // through Ruby's method dispatching (e.g. during message parse). It's cleaner
@@ -282,6 +276,7 @@ void Builder_free(void* _self);
 VALUE Builder_alloc(VALUE klass);
 void Builder_register(VALUE module);
 Builder* ruby_to_Builder(VALUE value);
+VALUE Builder_initialize(VALUE _self);
 VALUE Builder_add_message(VALUE _self, VALUE name);
 VALUE Builder_add_enum(VALUE _self, VALUE name);
 VALUE Builder_finalize_to_pool(VALUE _self, VALUE pool_rb);
@@ -397,6 +392,7 @@ typedef struct {
   upb_fieldtype_t key_type;
   upb_fieldtype_t value_type;
   VALUE value_type_class;
+  VALUE parse_frame;
   upb_strtable table;
 } Map;
 
@@ -405,6 +401,7 @@ void Map_free(void* self);
 VALUE Map_alloc(VALUE klass);
 VALUE Map_init(int argc, VALUE* argv, VALUE self);
 void Map_register(VALUE module);
+VALUE Map_set_frame(VALUE self, VALUE val);
 
 extern const rb_data_type_t Map_type;
 extern VALUE cMap;
@@ -424,6 +421,7 @@ VALUE Map_dup(VALUE _self);
 VALUE Map_deep_copy(VALUE _self);
 VALUE Map_eq(VALUE _self, VALUE _other);
 VALUE Map_hash(VALUE _self);
+VALUE Map_to_h(VALUE _self);
 VALUE Map_inspect(VALUE _self);
 VALUE Map_merge(VALUE _self, VALUE hashmap);
 VALUE Map_merge_into_self(VALUE _self, VALUE hashmap);
@@ -477,8 +475,20 @@ VALUE layout_inspect(MessageLayout* layout, void* storage);
 // Message class creation.
 // -----------------------------------------------------------------------------
 
+// This should probably be factored into a common upb component.
+
+typedef struct {
+  upb_byteshandler handler;
+  upb_bytessink sink;
+  char *ptr;
+  size_t len, size;
+} stringsink;
+
+void stringsink_uninit(stringsink *sink);
+
 struct MessageHeader {
-  Descriptor* descriptor;  // kept alive by self.class.descriptor reference.
+  Descriptor* descriptor;      // kept alive by self.class.descriptor reference.
+  stringsink* unknown_fields;  // store unknown fields in decoding.
   // Data comes after this.
 };
 
@@ -496,6 +506,7 @@ VALUE Message_deep_copy(VALUE _self);
 VALUE Message_eq(VALUE _self, VALUE _other);
 VALUE Message_hash(VALUE _self);
 VALUE Message_inspect(VALUE _self);
+VALUE Message_to_h(VALUE _self);
 VALUE Message_index(VALUE _self, VALUE field_name);
 VALUE Message_index_set(VALUE _self, VALUE field_name, VALUE value);
 VALUE Message_descriptor(VALUE klass);
@@ -504,6 +515,7 @@ VALUE Message_encode(VALUE klass, VALUE msg_rb);
 VALUE Message_decode_json(VALUE klass, VALUE data);
 VALUE Message_encode_json(int argc, VALUE* argv, VALUE klass);
 
+VALUE Google_Protobuf_discard_unknown(VALUE self, VALUE msg_rb);
 VALUE Google_Protobuf_deep_copy(VALUE self, VALUE obj);
 
 VALUE build_module_from_enumdesc(EnumDescriptor* enumdef);
diff --git a/ruby/ext/google/protobuf_c/repeated_field.c b/ruby/ext/google/protobuf_c/repeated_field.c
index 1c651c19..c6620ee6 100644
--- a/ruby/ext/google/protobuf_c/repeated_field.c
+++ b/ruby/ext/google/protobuf_c/repeated_field.c
@@ -626,8 +626,8 @@ void RepeatedField_register(VALUE module) {
   VALUE klass = rb_define_class_under(
       module, "RepeatedField", rb_cObject);
   rb_define_alloc_func(klass, RepeatedField_alloc);
-  cRepeatedField = klass;
   rb_gc_register_address(&cRepeatedField);
+  cRepeatedField = klass;
 
   rb_define_method(klass, "initialize",
                    RepeatedField_init, -1);
diff --git a/ruby/ext/google/protobuf_c/storage.c b/ruby/ext/google/protobuf_c/storage.c
index 3ff2bda6..1437c0b5 100644
--- a/ruby/ext/google/protobuf_c/storage.c
+++ b/ruby/ext/google/protobuf_c/storage.c
@@ -176,6 +176,15 @@ void native_slot_set_value_and_case(upb_fieldtype_t type, VALUE type_class,
       break;
     }
     case UPB_TYPE_STRING:
+      if (CLASS_OF(value) == rb_cSymbol) {
+        value = rb_funcall(value, rb_intern("to_s"), 0, NULL);
+      } else if (CLASS_OF(value) != rb_cString) {
+        rb_raise(rb_eTypeError, "Invalid argument for string field.");
+      }
+
+      DEREF(memory, VALUE) = native_slot_encode_and_freeze_string(type, value);
+      break;
+
     case UPB_TYPE_BYTES: {
       if (CLASS_OF(value) != rb_cString) {
         rb_raise(rb_eTypeError, "Invalid argument for string field.");
@@ -197,7 +206,9 @@ void native_slot_set_value_and_case(upb_fieldtype_t type, VALUE type_class,
     }
     case UPB_TYPE_ENUM: {
       int32_t int_val = 0;
-      if (!is_ruby_num(value) && TYPE(value) != T_SYMBOL) {
+      if (TYPE(value) == T_STRING) {
+        value = rb_funcall(value, rb_intern("to_sym"), 0, NULL);
+      } else if (!is_ruby_num(value) && TYPE(value) != T_SYMBOL) {
         rb_raise(rb_eTypeError,
                  "Expected number or symbol type for enum field.");
       }
@@ -595,12 +606,20 @@ static void check_repeated_field_type(VALUE val, const upb_fielddef* field) {
     rb_raise(rb_eTypeError, "Repeated field array has wrong element type");
   }
 
-  if (self->field_type == UPB_TYPE_MESSAGE ||
-      self->field_type == UPB_TYPE_ENUM) {
+  if (self->field_type == UPB_TYPE_MESSAGE) { 
+    if (self->field_type_class !=
+        Descriptor_msgclass(get_def_obj(upb_fielddef_subdef(field)))) {
+      rb_raise(rb_eTypeError,
+               "Repeated field array has wrong message class");
+    }
+  }
+
+
+  if (self->field_type == UPB_TYPE_ENUM) {
     if (self->field_type_class !=
-        get_def_obj(upb_fielddef_subdef(field))) {
+        EnumDescriptor_enummodule(get_def_obj(upb_fielddef_subdef(field)))) {
       rb_raise(rb_eTypeError,
-               "Repeated field array has wrong message/enum class");
+               "Repeated field array has wrong enum class");
     }
   }
 }
diff --git a/ruby/ext/google/protobuf_c/upb.c b/ruby/ext/google/protobuf_c/upb.c
index e0c56f8e..c02a5ce4 100644
--- a/ruby/ext/google/protobuf_c/upb.c
+++ b/ruby/ext/google/protobuf_c/upb.c
@@ -2,6 +2,585 @@
 #include "upb.h"
 
 
+/* Maps descriptor type -> upb field type.  */
+static const uint8_t upb_desctype_to_fieldtype[] = {
+  UPB_WIRE_TYPE_END_GROUP,  /* ENDGROUP */
+  UPB_TYPE_DOUBLE,          /* DOUBLE */
+  UPB_TYPE_FLOAT,           /* FLOAT */
+  UPB_TYPE_INT64,           /* INT64 */
+  UPB_TYPE_UINT64,          /* UINT64 */
+  UPB_TYPE_INT32,           /* INT32 */
+  UPB_TYPE_UINT64,          /* FIXED64 */
+  UPB_TYPE_UINT32,          /* FIXED32 */
+  UPB_TYPE_BOOL,            /* BOOL */
+  UPB_TYPE_STRING,          /* STRING */
+  UPB_TYPE_MESSAGE,         /* GROUP */
+  UPB_TYPE_MESSAGE,         /* MESSAGE */
+  UPB_TYPE_BYTES,           /* BYTES */
+  UPB_TYPE_UINT32,          /* UINT32 */
+  UPB_TYPE_ENUM,            /* ENUM */
+  UPB_TYPE_INT32,           /* SFIXED32 */
+  UPB_TYPE_INT64,           /* SFIXED64 */
+  UPB_TYPE_INT32,           /* SINT32 */
+  UPB_TYPE_INT64,           /* SINT64 */
+};
+
+/* Data pertaining to the parse. */
+typedef struct {
+  upb_env *env;
+  /* Current decoding pointer.  Points to the beginning of a field until we
+   * have finished decoding the whole field. */
+  const char *ptr;
+} upb_decstate;
+
+/* Data pertaining to a single message frame. */
+typedef struct {
+  const char *limit;
+  int32_t group_number;  /* 0 if we are not parsing a group. */
+
+  /* These members are unset for an unknown group frame. */
+  char *msg;
+  const upb_msglayout_msginit_v1 *m;
+} upb_decframe;
+
+#define CHK(x) if (!(x)) { return false; }
+
+static bool upb_skip_unknowngroup(upb_decstate *d, int field_number,
+                                  const char *limit);
+static bool upb_decode_message(upb_decstate *d, const char *limit,
+                               int group_number, char *msg,
+                               const upb_msglayout_msginit_v1 *l);
+
+static bool upb_decode_varint(const char **ptr, const char *limit,
+                              uint64_t *val) {
+  uint8_t byte;
+  int bitpos = 0;
+  const char *p = *ptr;
+  *val = 0;
+
+  do {
+    CHK(bitpos < 70 && p < limit);
+    byte = *p;
+    *val |= (uint64_t)(byte & 0x7F) << bitpos;
+    p++;
+    bitpos += 7;
+  } while (byte & 0x80);
+
+  *ptr = p;
+  return true;
+}
+
+static bool upb_decode_varint32(const char **ptr, const char *limit,
+                                uint32_t *val) {
+  uint64_t u64;
+  CHK(upb_decode_varint(ptr, limit, &u64) && u64 <= UINT32_MAX);
+  *val = u64;
+  return true;
+}
+
+static bool upb_decode_64bit(const char **ptr, const char *limit,
+                             uint64_t *val) {
+  CHK(limit - *ptr >= 8);
+  memcpy(val, *ptr, 8);
+  *ptr += 8;
+  return true;
+}
+
+static bool upb_decode_32bit(const char **ptr, const char *limit,
+                             uint32_t *val) {
+  CHK(limit - *ptr >= 4);
+  memcpy(val, *ptr, 4);
+  *ptr += 4;
+  return true;
+}
+
+static bool upb_decode_tag(const char **ptr, const char *limit,
+                           int *field_number, int *wire_type) {
+  uint32_t tag = 0;
+  CHK(upb_decode_varint32(ptr, limit, &tag));
+  *field_number = tag >> 3;
+  *wire_type = tag & 7;
+  return true;
+}
+
+static int32_t upb_zzdecode_32(uint32_t n) {
+  return (n >> 1) ^ -(int32_t)(n & 1);
+}
+
+static int64_t upb_zzdecode_64(uint64_t n) {
+  return (n >> 1) ^ -(int64_t)(n & 1);
+}
+
+static bool upb_decode_string(const char **ptr, const char *limit,
+                              upb_stringview *val) {
+  uint32_t len;
+
+  CHK(upb_decode_varint32(ptr, limit, &len) &&
+      len < INT32_MAX &&
+      limit - *ptr >= (int32_t)len);
+
+  *val = upb_stringview_make(*ptr, len);
+  *ptr += len;
+  return true;
+}
+
+static void upb_set32(void *msg, size_t ofs, uint32_t val) {
+  memcpy((char*)msg + ofs, &val, sizeof(val));
+}
+
+static bool upb_append_unknown(upb_decstate *d, upb_decframe *frame,
+                               const char *start) {
+  UPB_UNUSED(d);
+  UPB_UNUSED(frame);
+  UPB_UNUSED(start);
+  return true;
+}
+
+static bool upb_skip_unknownfielddata(upb_decstate *d, upb_decframe *frame,
+                                      int field_number, int wire_type) {
+  switch (wire_type) {
+    case UPB_WIRE_TYPE_VARINT: {
+      uint64_t val;
+      return upb_decode_varint(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_32BIT: {
+      uint32_t val;
+      return upb_decode_32bit(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_64BIT: {
+      uint64_t val;
+      return upb_decode_64bit(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_DELIMITED: {
+      upb_stringview val;
+      return upb_decode_string(&d->ptr, frame->limit, &val);
+    }
+    case UPB_WIRE_TYPE_START_GROUP:
+      return upb_skip_unknowngroup(d, field_number, frame->limit);
+    case UPB_WIRE_TYPE_END_GROUP:
+      CHK(field_number == frame->group_number);
+      frame->limit = d->ptr;
+      return true;
+  }
+  return false;
+}
+
+static bool upb_array_grow(upb_array *arr, size_t elements) {
+  size_t needed = arr->len + elements;
+  size_t new_size = UPB_MAX(arr->size, 8);
+  size_t new_bytes;
+  size_t old_bytes;
+  void *new_data;
+
+  while (new_size < needed) {
+    new_size *= 2;
+  }
+
+  old_bytes = arr->len * arr->element_size;
+  new_bytes = new_size * arr->element_size;
+  new_data = upb_realloc(arr->alloc, arr->data, old_bytes, new_bytes);
+  CHK(new_data);
+
+  arr->data = new_data;
+  arr->size = new_size;
+  return true;
+}
+
+static void *upb_array_reserve(upb_array *arr, size_t elements) {
+  if (arr->size - arr->len < elements) {
+    CHK(upb_array_grow(arr, elements));
+  }
+  return (char*)arr->data + (arr->len * arr->element_size);
+}
+
+static void *upb_array_add(upb_array *arr, size_t elements) {
+  void *ret = upb_array_reserve(arr, elements);
+  arr->len += elements;
+  return ret;
+}
+
+static upb_array *upb_getarr(upb_decframe *frame,
+                             const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->label == UPB_LABEL_REPEATED);
+  return *(upb_array**)&frame->msg[field->offset];
+}
+
+static upb_array *upb_getorcreatearr(upb_decstate *d,
+                                     upb_decframe *frame,
+                                     const upb_msglayout_fieldinit_v1 *field) {
+  upb_array *arr = upb_getarr(frame, field);
+
+  if (!arr) {
+    arr = upb_env_malloc(d->env, sizeof(*arr));
+    if (!arr) {
+      return NULL;
+    }
+    upb_array_init(arr, upb_desctype_to_fieldtype[field->type],
+                   upb_arena_alloc(upb_env_arena(d->env)));
+    *(upb_array**)&frame->msg[field->offset] = arr;
+  }
+
+  return arr;
+}
+
+static void upb_sethasbit(upb_decframe *frame,
+                          const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->hasbit != UPB_NO_HASBIT);
+  frame->msg[field->hasbit / 8] |= (1 << (field->hasbit % 8));
+}
+
+static void upb_setoneofcase(upb_decframe *frame,
+                             const upb_msglayout_fieldinit_v1 *field) {
+  UPB_ASSERT(field->oneof_index != UPB_NOT_IN_ONEOF);
+  upb_set32(frame->msg, frame->m->oneofs[field->oneof_index].case_offset,
+            field->number);
+}
+
+static char *upb_decode_prepareslot(upb_decstate *d,
+                                    upb_decframe *frame,
+                                    const upb_msglayout_fieldinit_v1 *field) {
+  char *field_mem = frame->msg + field->offset;
+  upb_array *arr;
+
+  if (field->label == UPB_LABEL_REPEATED) {
+    arr = upb_getorcreatearr(d, frame, field);
+    field_mem = upb_array_reserve(arr, 1);
+  }
+
+  return field_mem;
+}
+
+static void upb_decode_setpresent(upb_decframe *frame,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  if (field->label == UPB_LABEL_REPEATED) {
+   upb_array *arr = upb_getarr(frame, field);
+   UPB_ASSERT(arr->len < arr->size);
+   arr->len++;
+  } else if (field->oneof_index != UPB_NOT_IN_ONEOF) {
+    upb_setoneofcase(frame, field);
+  } else if (field->hasbit != UPB_NO_HASBIT) {
+    upb_sethasbit(frame, field);
+  }
+}
+
+static bool upb_decode_submsg(upb_decstate *d,
+                              upb_decframe *frame,
+                              const char *limit,
+                              const upb_msglayout_fieldinit_v1 *field,
+                              int group_number) {
+  char *submsg = *(void**)&frame->msg[field->offset];
+  const upb_msglayout_msginit_v1 *subm;
+
+  UPB_ASSERT(field->submsg_index != UPB_NO_SUBMSG);
+  subm = frame->m->submsgs[field->submsg_index];
+  UPB_ASSERT(subm);
+
+  if (!submsg) {
+    submsg = upb_env_malloc(d->env, upb_msg_sizeof((upb_msglayout *)subm));
+    CHK(submsg);
+    submsg = upb_msg_init(
+        submsg, (upb_msglayout*)subm, upb_arena_alloc(upb_env_arena(d->env)));
+    *(void**)&frame->msg[field->offset] = submsg;
+  }
+
+  upb_decode_message(d, limit, group_number, submsg, subm);
+
+  return true;
+}
+
+static bool upb_decode_varintfield(upb_decstate *d, upb_decframe *frame,
+                                   const char *field_start,
+                                   const upb_msglayout_fieldinit_v1 *field) {
+  uint64_t val;
+  void *field_mem;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_varint(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->type) {
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM: {
+      uint32_t val32 = val;
+      memcpy(field_mem, &val32, sizeof(val32));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_BOOL: {
+      bool valbool = val != 0;
+      memcpy(field_mem, &valbool, sizeof(valbool));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_SINT32: {
+      int32_t decoded = upb_zzdecode_32(val);
+      memcpy(field_mem, &decoded, sizeof(decoded));
+      break;
+    }
+    case UPB_DESCRIPTOR_TYPE_SINT64: {
+      int64_t decoded = upb_zzdecode_64(val);
+      memcpy(field_mem, &decoded, sizeof(decoded));
+      break;
+    }
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_64bitfield(upb_decstate *d, upb_decframe *frame,
+                                  const char *field_start,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  void *field_mem;
+  uint64_t val;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_64bit(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->type) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_32bitfield(upb_decstate *d, upb_decframe *frame,
+                                  const char *field_start,
+                                  const upb_msglayout_fieldinit_v1 *field) {
+  void *field_mem;
+  uint32_t val;
+
+  field_mem = upb_decode_prepareslot(d, frame, field);
+  CHK(field_mem);
+  CHK(upb_decode_32bit(&d->ptr, frame->limit, &val));
+
+  switch ((upb_descriptortype_t)field->type) {
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      memcpy(field_mem, &val, sizeof(val));
+      break;
+    default:
+      return upb_append_unknown(d, frame, field_start);
+  }
+
+  upb_decode_setpresent(frame, field);
+  return true;
+}
+
+static bool upb_decode_fixedpacked(upb_array *arr, upb_stringview data,
+                                   int elem_size) {
+  int elements = data.size / elem_size;
+  void *field_mem;
+
+  CHK((size_t)(elements * elem_size) == data.size);
+  field_mem = upb_array_add(arr, elements);
+  CHK(field_mem);
+  memcpy(field_mem, data.data, data.size);
+  return true;
+}
+
+static bool upb_decode_toarray(upb_decstate *d, upb_decframe *frame,
+                               const char *field_start,
+                               const upb_msglayout_fieldinit_v1 *field,
+                               upb_stringview val) {
+  upb_array *arr = upb_getorcreatearr(d, frame, field);
+
+#define VARINT_CASE(ctype, decode) { \
+  const char *ptr = val.data; \
+  const char *limit = ptr + val.size; \
+  while (ptr < limit) { \
+    uint64_t val; \
+    void *field_mem; \
+    ctype decoded; \
+    CHK(upb_decode_varint(&ptr, limit, &val)); \
+    decoded = (decode)(val); \
+    field_mem = upb_array_add(arr, 1); \
+    CHK(field_mem); \
+    memcpy(field_mem, &decoded, sizeof(ctype)); \
+  } \
+  return true; \
+}
+
+  switch ((upb_descriptortype_t)field->type) {
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      void *field_mem = upb_array_add(arr, 1);
+      CHK(field_mem);
+      memcpy(field_mem, &val, sizeof(val));
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      return upb_decode_fixedpacked(arr, val, sizeof(int32_t));
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+      return upb_decode_fixedpacked(arr, val, sizeof(int64_t));
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      /* TODO: proto2 enum field that isn't in the enum. */
+      VARINT_CASE(uint32_t, uint32_t);
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      VARINT_CASE(uint64_t, uint64_t);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      VARINT_CASE(bool, bool);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      VARINT_CASE(int32_t, upb_zzdecode_32);
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      VARINT_CASE(int64_t, upb_zzdecode_64);
+    case UPB_DESCRIPTOR_TYPE_MESSAGE:
+      CHK(val.size <= (size_t)(frame->limit - val.data));
+      return upb_decode_submsg(d, frame, val.data + val.size, field, 0);
+    case UPB_DESCRIPTOR_TYPE_GROUP:
+      return upb_append_unknown(d, frame, field_start);
+  }
+#undef VARINT_CASE
+  UPB_UNREACHABLE();
+}
+
+static bool upb_decode_delimitedfield(upb_decstate *d, upb_decframe *frame,
+                                      const char *field_start,
+                                      const upb_msglayout_fieldinit_v1 *field) {
+  upb_stringview val;
+
+  CHK(upb_decode_string(&d->ptr, frame->limit, &val));
+
+  if (field->label == UPB_LABEL_REPEATED) {
+    return upb_decode_toarray(d, frame, field_start, field, val);
+  } else {
+    switch ((upb_descriptortype_t)field->type) {
+      case UPB_DESCRIPTOR_TYPE_STRING:
+      case UPB_DESCRIPTOR_TYPE_BYTES: {
+        void *field_mem = upb_decode_prepareslot(d, frame, field);
+        CHK(field_mem);
+        memcpy(field_mem, &val, sizeof(val));
+        break;
+      }
+      case UPB_DESCRIPTOR_TYPE_MESSAGE:
+        CHK(val.size <= (size_t)(frame->limit - val.data));
+        CHK(upb_decode_submsg(d, frame, val.data + val.size, field, 0));
+        break;
+      default:
+        /* TODO(haberman): should we accept the last element of a packed? */
+        return upb_append_unknown(d, frame, field_start);
+    }
+    upb_decode_setpresent(frame, field);
+    return true;
+  }
+}
+
+static const upb_msglayout_fieldinit_v1 *upb_find_field(
+    const upb_msglayout_msginit_v1 *l, uint32_t field_number) {
+  /* Lots of optimization opportunities here. */
+  int i;
+  for (i = 0; i < l->field_count; i++) {
+    if (l->fields[i].number == field_number) {
+      return &l->fields[i];
+    }
+  }
+
+  return NULL;  /* Unknown field. */
+}
+
+static bool upb_decode_field(upb_decstate *d, upb_decframe *frame) {
+  int field_number;
+  int wire_type;
+  const char *field_start = d->ptr;
+  const upb_msglayout_fieldinit_v1 *field;
+
+  CHK(upb_decode_tag(&d->ptr, frame->limit, &field_number, &wire_type));
+  field = upb_find_field(frame->m, field_number);
+
+  if (field) {
+    switch (wire_type) {
+      case UPB_WIRE_TYPE_VARINT:
+        return upb_decode_varintfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_32BIT:
+        return upb_decode_32bitfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_64BIT:
+        return upb_decode_64bitfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_DELIMITED:
+        return upb_decode_delimitedfield(d, frame, field_start, field);
+      case UPB_WIRE_TYPE_START_GROUP:
+        CHK(field->type == UPB_DESCRIPTOR_TYPE_GROUP);
+        return upb_decode_submsg(d, frame, frame->limit, field, field_number);
+      case UPB_WIRE_TYPE_END_GROUP:
+        CHK(frame->group_number == field_number)
+        frame->limit = d->ptr;
+        return true;
+      default:
+        return false;
+    }
+  } else {
+    CHK(field_number != 0);
+    return upb_skip_unknownfielddata(d, frame, field_number, wire_type);
+  }
+}
+
+static bool upb_skip_unknowngroup(upb_decstate *d, int field_number,
+                                  const char *limit) {
+  upb_decframe frame;
+  frame.msg = NULL;
+  frame.m = NULL;
+  frame.group_number = field_number;
+  frame.limit = limit;
+
+  while (d->ptr < frame.limit) {
+    int wire_type;
+    int field_number;
+
+    CHK(upb_decode_tag(&d->ptr, frame.limit, &field_number, &wire_type));
+    CHK(upb_skip_unknownfielddata(d, &frame, field_number, wire_type));
+  }
+
+  return true;
+}
+
+static bool upb_decode_message(upb_decstate *d, const char *limit,
+                               int group_number, char *msg,
+                               const upb_msglayout_msginit_v1 *l) {
+  upb_decframe frame;
+  frame.group_number = group_number;
+  frame.limit = limit;
+  frame.msg = msg;
+  frame.m = l;
+
+  while (d->ptr < frame.limit) {
+    CHK(upb_decode_field(d, &frame));
+  }
+
+  return true;
+}
+
+bool upb_decode(upb_stringview buf, void *msg,
+                const upb_msglayout_msginit_v1 *l, upb_env *env) {
+  upb_decstate state;
+  state.ptr = buf.data;
+  state.env = env;
+
+  return upb_decode_message(&state, buf.data + buf.size, 0, msg, l);
+}
+
+#undef CHK
+
+
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
@@ -326,6 +905,7 @@ static bool assign_msg_indices(upb_msgdef *m, upb_status *s) {
     v = upb_value_bool(true);
     upb_inttable_insert(&t, UPB_STARTMSG_SELECTOR, v);
     upb_inttable_insert(&t, UPB_ENDMSG_SELECTOR, v);
+    upb_inttable_insert(&t, UPB_UNKNOWN_SELECTOR, v);
     for(upb_msg_field_begin(&j, m);
         !upb_msg_field_done(&j);
         upb_msg_field_next(&j)) {
@@ -377,13 +957,14 @@ bool _upb_def_validate(upb_def *const*defs, size_t n, upb_status *s) {
     } else if (def->type == UPB_DEF_FIELD) {
       upb_status_seterrmsg(s, "standalone fielddefs can not be frozen");
       goto err;
-    } else if (def->type == UPB_DEF_ENUM) {
-      if (!upb_validate_enumdef(upb_dyncast_enumdef(def), s)) {
-        goto err;
-      }
     } else {
       /* Set now to detect transitive closure in the second pass. */
       def->came_from_user = true;
+
+      if (def->type == UPB_DEF_ENUM &&
+          !upb_validate_enumdef(upb_dyncast_enumdef(def), s)) {
+        goto err;
+      }
     }
   }
 
@@ -710,43 +1291,6 @@ upb_fielddef *upb_fielddef_new(const void *o) {
   return f;
 }
 
-static upb_fielddef *upb_fielddef_dup(const upb_fielddef *f,
-                                      const void *owner) {
-  const char *srcname;
-  upb_fielddef *newf = upb_fielddef_new(owner);
-  if (!newf) return NULL;
-  upb_fielddef_settype(newf, upb_fielddef_type(f));
-  upb_fielddef_setlabel(newf, upb_fielddef_label(f));
-  upb_fielddef_setnumber(newf, upb_fielddef_number(f), NULL);
-  upb_fielddef_setname(newf, upb_fielddef_name(f), NULL);
-  if (f->default_is_string && f->defaultval.bytes) {
-    str_t *s = f->defaultval.bytes;
-    upb_fielddef_setdefaultstr(newf, s->str, s->len, NULL);
-  } else {
-    newf->default_is_string = f->default_is_string;
-    newf->defaultval = f->defaultval;
-  }
-
-  if (f->subdef_is_symbolic) {
-    srcname = f->sub.name;  /* Might be NULL. */
-  } else {
-    srcname = f->sub.def ? upb_def_fullname(f->sub.def) : NULL;
-  }
-  if (srcname) {
-    char *newname = upb_gmalloc(strlen(f->sub.def->fullname) + 2);
-    if (!newname) {
-      upb_fielddef_unref(newf, owner);
-      return NULL;
-    }
-    strcpy(newname, ".");
-    strcat(newname, f->sub.def->fullname);
-    upb_fielddef_setsubdefname(newf, newname, NULL);
-    upb_gfree(newname);
-  }
-
-  return newf;
-}
-
 bool upb_fielddef_typeisset(const upb_fielddef *f) {
   return f->type_is_set_;
 }
@@ -1426,44 +1970,6 @@ err2:
   return NULL;
 }
 
-static upb_oneofdef *upb_oneofdef_dup(const upb_oneofdef *o, const void *owner);
-
-static upb_msgdef *upb_msgdef_dup(const upb_msgdef *m, const void *owner) {
-  bool ok;
-  upb_msg_field_iter i;
-  upb_msg_oneof_iter o;
-
-  upb_msgdef *newm = upb_msgdef_new(owner);
-  if (!newm) return NULL;
-  ok = upb_def_setfullname(upb_msgdef_upcast_mutable(newm),
-                           upb_def_fullname(upb_msgdef_upcast(m)),
-                           NULL);
-  newm->map_entry = m->map_entry;
-  newm->syntax = m->syntax;
-  UPB_ASSERT(ok);
-  for(upb_msg_field_begin(&i, m);
-      !upb_msg_field_done(&i);
-      upb_msg_field_next(&i)) {
-    upb_fielddef *f = upb_fielddef_dup(upb_msg_iter_field(&i), &f);
-    /* Fields in oneofs are dup'd below. */
-    if (upb_fielddef_containingoneof(f)) continue;
-    if (!f || !upb_msgdef_addfield(newm, f, &f, NULL)) {
-      upb_msgdef_unref(newm, owner);
-      return NULL;
-    }
-  }
-  for(upb_msg_oneof_begin(&o, m);
-      !upb_msg_oneof_done(&o);
-      upb_msg_oneof_next(&o)) {
-    upb_oneofdef *f = upb_oneofdef_dup(upb_msg_iter_oneof(&o), &f);
-    if (!f || !upb_msgdef_addoneof(newm, f, &f, NULL)) {
-      upb_msgdef_unref(newm, owner);
-      return NULL;
-    }
-  }
-  return newm;
-}
-
 bool upb_msgdef_freeze(upb_msgdef *m, upb_status *status) {
   upb_def *d = upb_msgdef_upcast_mutable(m);
   return upb_def_freeze(&d, 1, status);
@@ -1764,24 +2270,6 @@ err2:
   return NULL;
 }
 
-static upb_oneofdef *upb_oneofdef_dup(const upb_oneofdef *o,
-                                      const void *owner) {
-  bool ok;
-  upb_oneof_iter i;
-  upb_oneofdef *newo = upb_oneofdef_new(owner);
-  if (!newo) return NULL;
-  ok = upb_oneofdef_setname(newo, upb_oneofdef_name(o), NULL);
-  UPB_ASSERT(ok);
-  for (upb_oneof_begin(&i, o); !upb_oneof_done(&i); upb_oneof_next(&i)) {
-    upb_fielddef *f = upb_fielddef_dup(upb_oneof_iter_field(&i), &f);
-    if (!f || !upb_oneofdef_addfield(newo, f, &f, NULL)) {
-      upb_oneofdef_unref(newo, owner);
-      return NULL;
-    }
-  }
-  return newo;
-}
-
 const char *upb_oneofdef_name(const upb_oneofdef *o) { return o->name; }
 
 bool upb_oneofdef_setname(upb_oneofdef *o, const char *name, upb_status *s) {
@@ -1950,6 +2438,8 @@ static void freefiledef(upb_refcounted *r) {
   upb_inttable_uninit(&f->deps);
   upb_gfree((void*)f->name);
   upb_gfree((void*)f->package);
+  upb_gfree((void*)f->phpprefix);
+  upb_gfree((void*)f->phpnamespace);
   upb_gfree(f);
 }
 
@@ -1964,6 +2454,8 @@ upb_filedef *upb_filedef_new(const void *owner) {
 
   f->package = NULL;
   f->name = NULL;
+  f->phpprefix = NULL;
+  f->phpnamespace = NULL;
   f->syntax = UPB_SYNTAX_PROTO2;
 
   if (!upb_refcounted_init(upb_filedef_upcast_mutable(f), &upb_filedef_vtbl,
@@ -1998,6 +2490,14 @@ const char *upb_filedef_package(const upb_filedef *f) {
   return f->package;
 }
 
+const char *upb_filedef_phpprefix(const upb_filedef *f) {
+  return f->phpprefix;
+}
+
+const char *upb_filedef_phpnamespace(const upb_filedef *f) {
+  return f->phpnamespace;
+}
+
 upb_syntax_t upb_filedef_syntax(const upb_filedef *f) {
   return f->syntax;
 }
@@ -2054,6 +2554,30 @@ bool upb_filedef_setpackage(upb_filedef *f, const char *package,
   return true;
 }
 
+bool upb_filedef_setphpprefix(upb_filedef *f, const char *phpprefix,
+                              upb_status *s) {
+  phpprefix = upb_gstrdup(phpprefix);
+  if (!phpprefix) {
+    upb_upberr_setoom(s);
+    return false;
+  }
+  upb_gfree((void*)f->phpprefix);
+  f->phpprefix = phpprefix;
+  return true;
+}
+
+bool upb_filedef_setphpnamespace(upb_filedef *f, const char *phpnamespace,
+                                 upb_status *s) {
+  phpnamespace = upb_gstrdup(phpnamespace);
+  if (!phpnamespace) {
+    upb_upberr_setoom(s);
+    return false;
+  }
+  upb_gfree((void*)f->phpnamespace);
+  f->phpnamespace = phpnamespace;
+  return true;
+}
+
 bool upb_filedef_setsyntax(upb_filedef *f, upb_syntax_t syntax,
                            upb_status *s) {
   UPB_UNUSED(s);
@@ -2240,57 +2764,14 @@ static bool symtab_add(upb_symtab *s, upb_def *const*defs, size_t n,
                            fullname);
         goto err;
       }
-      upb_def_donateref(def, ref_donor, s);
       if (!upb_strtable_insert(&addtab, fullname, upb_value_ptr(def)))
         goto oom_err;
-      def->came_from_user = true;
-    }
-  }
-
-  /* Add standalone fielddefs (ie. extensions) to the appropriate messages.
-   * If the appropriate message only exists in the existing symtab, duplicate
-   * it so we have a mutable copy we can add the fields to. */
-  for (i = 0; i < n; i++) {
-    upb_def *def = defs[i];
-    upb_fielddef *f = upb_dyncast_fielddef_mutable(def);
-    const char *msgname;
-    upb_value v;
-    upb_msgdef *m;
-
-    if (!f) continue;
-    msgname = upb_fielddef_containingtypename(f);
-    /* We validated this earlier in this function. */
-    UPB_ASSERT(msgname);
-
-    /* If the extendee name is absolutely qualified, move past the initial ".".
-     * TODO(haberman): it is not obvious what it would mean if this was not
-     * absolutely qualified. */
-    if (msgname[0] == '.') {
-      msgname++;
-    }
-
-    if (upb_strtable_lookup(&addtab, msgname, &v)) {
-      /* Extendee is in the set of defs the user asked us to add. */
-      m = upb_value_getptr(v);
-    } else {
-      /* Need to find and dup the extendee from the existing symtab. */
-      const upb_msgdef *frozen_m = upb_symtab_lookupmsg(s, msgname);
-      if (!frozen_m) {
-        upb_status_seterrf(status,
-                           "Tried to extend message %s that does not exist "
-                           "in this SymbolTable.",
-                           msgname);
-        goto err;
-      }
-      m = upb_msgdef_dup(frozen_m, s);
-      if (!m) goto oom_err;
-      if (!upb_strtable_insert(&addtab, msgname, upb_value_ptr(m))) {
-        upb_msgdef_unref(m, s);
-        goto oom_err;
-      }
+      upb_def_donateref(def, ref_donor, s);
     }
 
-    if (!upb_msgdef_addfield(m, f, ref_donor, status)) {
+    if (upb_dyncast_fielddef_mutable(def)) {
+      /* TODO(haberman): allow adding extensions attached to files. */
+      upb_status_seterrf(status, "Can't add extensions to symtab.\n");
       goto err;
     }
   }
@@ -2372,15 +2853,9 @@ static bool symtab_add(upb_symtab *s, upb_def *const*defs, size_t n,
   for (i = 0; i < add_n; i++) {
     upb_def *def = (upb_def*)add_objs[i];
     const char *name = upb_def_fullname(def);
-    upb_value v;
     bool success;
-
-    if (upb_strtable_remove(&s->symtab, name, &v)) {
-      const upb_def *def = upb_value_getptr(v);
-      upb_def_unref(def, s);
-    }
     success = upb_strtable_insert(&s->symtab, name, upb_value_ptr(def));
-    UPB_ASSERT(success == true);
+    UPB_ASSERT(success);
   }
   upb_gfree(add_defs);
   return true;
@@ -2413,6 +2888,9 @@ bool upb_symtab_addfile(upb_symtab *s, upb_filedef *file, upb_status *status) {
   bool ret;
 
   n = upb_filedef_defcount(file);
+  if (n == 0) {
+    return true;
+  }
   defs = upb_gmalloc(sizeof(*defs) * n);
 
   if (defs == NULL) {
@@ -2461,6 +2939,397 @@ bool upb_symtab_done(const upb_symtab_iter *iter) {
 const upb_def *upb_symtab_iter_def(const upb_symtab_iter *iter) {
   return upb_value_getptr(upb_strtable_iter_value(&iter->iter));
 }
+/* We encode backwards, to avoid pre-computing lengths (one-pass encode). */
+
+
+#define UPB_PB_VARINT_MAX_LEN 10
+#define CHK(x) do { if (!(x)) { return false; } } while(0)
+
+/* Maps descriptor type -> upb field type.  */
+static const uint8_t upb_desctype_to_fieldtype2[] = {
+  UPB_WIRE_TYPE_END_GROUP,  /* ENDGROUP */
+  UPB_TYPE_DOUBLE,          /* DOUBLE */
+  UPB_TYPE_FLOAT,           /* FLOAT */
+  UPB_TYPE_INT64,           /* INT64 */
+  UPB_TYPE_UINT64,          /* UINT64 */
+  UPB_TYPE_INT32,           /* INT32 */
+  UPB_TYPE_UINT64,          /* FIXED64 */
+  UPB_TYPE_UINT32,          /* FIXED32 */
+  UPB_TYPE_BOOL,            /* BOOL */
+  UPB_TYPE_STRING,          /* STRING */
+  UPB_TYPE_MESSAGE,         /* GROUP */
+  UPB_TYPE_MESSAGE,         /* MESSAGE */
+  UPB_TYPE_BYTES,           /* BYTES */
+  UPB_TYPE_UINT32,          /* UINT32 */
+  UPB_TYPE_ENUM,            /* ENUM */
+  UPB_TYPE_INT32,           /* SFIXED32 */
+  UPB_TYPE_INT64,           /* SFIXED64 */
+  UPB_TYPE_INT32,           /* SINT32 */
+  UPB_TYPE_INT64,           /* SINT64 */
+};
+
+static size_t upb_encode_varint(uint64_t val, char *buf) {
+  size_t i;
+  if (val < 128) { buf[0] = val; return 1; }
+  i = 0;
+  while (val) {
+    uint8_t byte = val & 0x7fU;
+    val >>= 7;
+    if (val) byte |= 0x80U;
+    buf[i++] = byte;
+  }
+  return i;
+}
+
+static uint32_t upb_zzencode_32(int32_t n) { return (n << 1) ^ (n >> 31); }
+static uint64_t upb_zzencode_64(int64_t n) { return (n << 1) ^ (n >> 63); }
+
+typedef struct {
+  upb_env *env;
+  char *buf, *ptr, *limit;
+} upb_encstate;
+
+static size_t upb_roundup_pow2(size_t bytes) {
+  size_t ret = 128;
+  while (ret < bytes) {
+    ret *= 2;
+  }
+  return ret;
+}
+
+static bool upb_encode_growbuffer(upb_encstate *e, size_t bytes) {
+  size_t old_size = e->limit - e->buf;
+  size_t new_size = upb_roundup_pow2(bytes + (e->limit - e->ptr));
+  char *new_buf = upb_env_realloc(e->env, e->buf, old_size, new_size);
+  CHK(new_buf);
+
+  /* We want previous data at the end, realloc() put it at the beginning. */
+  memmove(e->limit - old_size, e->buf, old_size);
+
+  e->ptr = new_buf + new_size - (e->limit - e->ptr);
+  e->limit = new_buf + new_size;
+  e->buf = new_buf;
+  return true;
+}
+
+/* Call to ensure that at least "bytes" bytes are available for writing at
+ * e->ptr.  Returns false if the bytes could not be allocated. */
+static bool upb_encode_reserve(upb_encstate *e, size_t bytes) {
+  CHK(UPB_LIKELY((size_t)(e->ptr - e->buf) >= bytes) ||
+      upb_encode_growbuffer(e, bytes));
+
+  e->ptr -= bytes;
+  return true;
+}
+
+/* Writes the given bytes to the buffer, handling reserve/advance. */
+static bool upb_put_bytes(upb_encstate *e, const void *data, size_t len) {
+  CHK(upb_encode_reserve(e, len));
+  memcpy(e->ptr, data, len);
+  return true;
+}
+
+static bool upb_put_fixed64(upb_encstate *e, uint64_t val) {
+  /* TODO(haberman): byte-swap for big endian. */
+  return upb_put_bytes(e, &val, sizeof(uint64_t));
+}
+
+static bool upb_put_fixed32(upb_encstate *e, uint32_t val) {
+  /* TODO(haberman): byte-swap for big endian. */
+  return upb_put_bytes(e, &val, sizeof(uint32_t));
+}
+
+static bool upb_put_varint(upb_encstate *e, uint64_t val) {
+  size_t len;
+  char *start;
+  CHK(upb_encode_reserve(e, UPB_PB_VARINT_MAX_LEN));
+  len = upb_encode_varint(val, e->ptr);
+  start = e->ptr + UPB_PB_VARINT_MAX_LEN - len;
+  memmove(start, e->ptr, len);
+  e->ptr = start;
+  return true;
+}
+
+static bool upb_put_double(upb_encstate *e, double d) {
+  uint64_t u64;
+  UPB_ASSERT(sizeof(double) == sizeof(uint64_t));
+  memcpy(&u64, &d, sizeof(uint64_t));
+  return upb_put_fixed64(e, u64);
+}
+
+static bool upb_put_float(upb_encstate *e, float d) {
+  uint32_t u32;
+  UPB_ASSERT(sizeof(float) == sizeof(uint32_t));
+  memcpy(&u32, &d, sizeof(uint32_t));
+  return upb_put_fixed32(e, u32);
+}
+
+static uint32_t upb_readcase(const char *msg, const upb_msglayout_msginit_v1 *m,
+                             int oneof_index) {
+  uint32_t ret;
+  memcpy(&ret, msg + m->oneofs[oneof_index].case_offset, sizeof(ret));
+  return ret;
+}
+
+static bool upb_readhasbit(const char *msg,
+                           const upb_msglayout_fieldinit_v1 *f) {
+  UPB_ASSERT(f->hasbit != UPB_NO_HASBIT);
+  return msg[f->hasbit / 8] & (1 << (f->hasbit % 8));
+}
+
+static bool upb_put_tag(upb_encstate *e, int field_number, int wire_type) {
+  return upb_put_varint(e, (field_number << 3) | wire_type);
+}
+
+static bool upb_put_fixedarray(upb_encstate *e, const upb_array *arr,
+                               size_t size) {
+  size_t bytes = arr->len * size;
+  return upb_put_bytes(e, arr->data, bytes) && upb_put_varint(e, bytes);
+}
+
+bool upb_encode_message(upb_encstate *e, const char *msg,
+                        const upb_msglayout_msginit_v1 *m,
+                        size_t *size);
+
+static bool upb_encode_array(upb_encstate *e, const char *field_mem,
+                             const upb_msglayout_msginit_v1 *m,
+                             const upb_msglayout_fieldinit_v1 *f) {
+  const upb_array *arr = *(const upb_array**)field_mem;
+
+  if (arr == NULL || arr->len == 0) {
+    return true;
+  }
+
+  UPB_ASSERT(arr->type == upb_desctype_to_fieldtype2[f->type]);
+
+#define VARINT_CASE(ctype, encode) { \
+  ctype *start = arr->data; \
+  ctype *ptr = start + arr->len; \
+  size_t pre_len = e->limit - e->ptr; \
+  do { \
+    ptr--; \
+    CHK(upb_put_varint(e, encode)); \
+  } while (ptr != start); \
+  CHK(upb_put_varint(e, e->limit - e->ptr - pre_len)); \
+} \
+break; \
+do { ; } while(0)
+
+  switch (f->type) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+      CHK(upb_put_fixedarray(e, arr, sizeof(double)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+      CHK(upb_put_fixedarray(e, arr, sizeof(float)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+      CHK(upb_put_fixedarray(e, arr, sizeof(uint64_t)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      CHK(upb_put_fixedarray(e, arr, sizeof(uint32_t)));
+      break;
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      VARINT_CASE(uint64_t, *ptr);
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      VARINT_CASE(uint32_t, *ptr);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      VARINT_CASE(bool, *ptr);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      VARINT_CASE(int32_t, upb_zzencode_32(*ptr));
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      VARINT_CASE(int64_t, upb_zzencode_64(*ptr));
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      upb_stringview *start = arr->data;
+      upb_stringview *ptr = start + arr->len;
+      do {
+        ptr--;
+        CHK(upb_put_bytes(e, ptr->data, ptr->size) &&
+            upb_put_varint(e, ptr->size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+      } while (ptr != start);
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_GROUP: {
+      void **start = arr->data;
+      void **ptr = start + arr->len;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      do {
+        size_t size;
+        ptr--;
+        CHK(upb_put_tag(e, f->number, UPB_WIRE_TYPE_END_GROUP) &&
+            upb_encode_message(e, *ptr, subm, &size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_START_GROUP));
+      } while (ptr != start);
+      return true;
+    }
+    case UPB_DESCRIPTOR_TYPE_MESSAGE: {
+      void **start = arr->data;
+      void **ptr = start + arr->len;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      do {
+        size_t size;
+        ptr--;
+        CHK(upb_encode_message(e, *ptr, subm, &size) &&
+            upb_put_varint(e, size) &&
+            upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+      } while (ptr != start);
+      return true;
+    }
+  }
+#undef VARINT_CASE
+
+  /* We encode all primitive arrays as packed, regardless of what was specified
+   * in the .proto file.  Could special case 1-sized arrays. */
+  CHK(upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED));
+  return true;
+}
+
+static bool upb_encode_scalarfield(upb_encstate *e, const char *field_mem,
+                                   const upb_msglayout_msginit_v1 *m,
+                                   const upb_msglayout_fieldinit_v1 *f,
+                                   bool is_proto3) {
+  bool skip_zero_value = is_proto3 && f->oneof_index == UPB_NOT_IN_ONEOF;
+
+#define CASE(ctype, type, wire_type, encodeval) do { \
+  ctype val = *(ctype*)field_mem; \
+  if (skip_zero_value && val == 0) { \
+    return true; \
+  } \
+  return upb_put_ ## type(e, encodeval) && \
+      upb_put_tag(e, f->number, wire_type); \
+} while(0)
+
+  switch (f->type) {
+    case UPB_DESCRIPTOR_TYPE_DOUBLE:
+      CASE(double, double, UPB_WIRE_TYPE_64BIT, val);
+    case UPB_DESCRIPTOR_TYPE_FLOAT:
+      CASE(float, float, UPB_WIRE_TYPE_32BIT, val);
+    case UPB_DESCRIPTOR_TYPE_INT64:
+    case UPB_DESCRIPTOR_TYPE_UINT64:
+      CASE(uint64_t, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_UINT32:
+    case UPB_DESCRIPTOR_TYPE_INT32:
+    case UPB_DESCRIPTOR_TYPE_ENUM:
+      CASE(uint32_t, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_SFIXED64:
+    case UPB_DESCRIPTOR_TYPE_FIXED64:
+      CASE(uint64_t, fixed64, UPB_WIRE_TYPE_64BIT, val);
+    case UPB_DESCRIPTOR_TYPE_FIXED32:
+    case UPB_DESCRIPTOR_TYPE_SFIXED32:
+      CASE(uint32_t, fixed32, UPB_WIRE_TYPE_32BIT, val);
+    case UPB_DESCRIPTOR_TYPE_BOOL:
+      CASE(bool, varint, UPB_WIRE_TYPE_VARINT, val);
+    case UPB_DESCRIPTOR_TYPE_SINT32:
+      CASE(int32_t, varint, UPB_WIRE_TYPE_VARINT, upb_zzencode_32(val));
+    case UPB_DESCRIPTOR_TYPE_SINT64:
+      CASE(int64_t, varint, UPB_WIRE_TYPE_VARINT, upb_zzencode_64(val));
+    case UPB_DESCRIPTOR_TYPE_STRING:
+    case UPB_DESCRIPTOR_TYPE_BYTES: {
+      upb_stringview view = *(upb_stringview*)field_mem;
+      if (skip_zero_value && view.size == 0) {
+        return true;
+      }
+      return upb_put_bytes(e, view.data, view.size) &&
+          upb_put_varint(e, view.size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED);
+    }
+    case UPB_DESCRIPTOR_TYPE_GROUP: {
+      size_t size;
+      void *submsg = *(void**)field_mem;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      if (skip_zero_value && submsg == NULL) {
+        return true;
+      }
+      return upb_put_tag(e, f->number, UPB_WIRE_TYPE_END_GROUP) &&
+          upb_encode_message(e, submsg, subm, &size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_START_GROUP);
+    }
+    case UPB_DESCRIPTOR_TYPE_MESSAGE: {
+      size_t size;
+      void *submsg = *(void**)field_mem;
+      const upb_msglayout_msginit_v1 *subm = m->submsgs[f->submsg_index];
+      if (skip_zero_value && submsg == NULL) {
+        return true;
+      }
+      return upb_encode_message(e, submsg, subm, &size) &&
+          upb_put_varint(e, size) &&
+          upb_put_tag(e, f->number, UPB_WIRE_TYPE_DELIMITED);
+    }
+  }
+#undef CASE
+  UPB_UNREACHABLE();
+}
+
+bool upb_encode_hasscalarfield(const char *msg,
+                               const upb_msglayout_msginit_v1 *m,
+                               const upb_msglayout_fieldinit_v1 *f) {
+  if (f->oneof_index != UPB_NOT_IN_ONEOF) {
+    return upb_readcase(msg, m, f->oneof_index) == f->number;
+  } else if (m->is_proto2) {
+    return upb_readhasbit(msg, f);
+  } else {
+    /* For proto3, we'll test for the field being empty later. */
+    return true;
+  }
+}
+
+bool upb_encode_message(upb_encstate* e, const char *msg,
+                        const upb_msglayout_msginit_v1 *m,
+                        size_t *size) {
+  int i;
+  char *buf_end = e->ptr;
+
+  if (msg == NULL) {
+    return true;
+  }
+
+  for (i = m->field_count - 1; i >= 0; i--) {
+    const upb_msglayout_fieldinit_v1 *f = &m->fields[i];
+
+    if (f->label == UPB_LABEL_REPEATED) {
+      CHK(upb_encode_array(e, msg + f->offset, m, f));
+    } else {
+      if (upb_encode_hasscalarfield(msg, m, f)) {
+        CHK(upb_encode_scalarfield(e, msg + f->offset, m, f, !m->is_proto2));
+      }
+    }
+  }
+
+  *size = buf_end - e->ptr;
+  return true;
+}
+
+char *upb_encode(const void *msg, const upb_msglayout_msginit_v1 *m,
+                 upb_env *env, size_t *size) {
+  upb_encstate e;
+  e.env = env;
+  e.buf = NULL;
+  e.limit = NULL;
+  e.ptr = NULL;
+
+  if (!upb_encode_message(&e, msg, m, size)) {
+    *size = 0;
+    return NULL;
+  }
+
+  *size = e.limit - e.ptr;
+
+  if (*size == 0) {
+    static char ch;
+    return &ch;
+  } else {
+    UPB_ASSERT(e.ptr);
+    return e.ptr;
+  }
+}
+
+#undef CHK
 /*
 ** TODO(haberman): it's unclear whether a lot of the consistency checks should
 ** UPB_ASSERT() or return false.
@@ -2832,6 +3701,12 @@ SETTER(endseq,      upb_endfield_handlerfunc*,    UPB_HANDLER_ENDSEQ)
 
 #undef SETTER
 
+bool upb_handlers_setunknown(upb_handlers *h, upb_unknown_handlerfunc *func,
+                             upb_handlerattr *attr) {
+  return doset(h, UPB_UNKNOWN_SELECTOR, NULL, UPB_HANDLER_INT32,
+               (upb_func *)func, attr);
+}
+
 bool upb_handlers_setstartmsg(upb_handlers *h, upb_startmsg_handlerfunc *func,
                               upb_handlerattr *attr) {
   return doset(h, UPB_STARTMSG_SELECTOR, NULL, UPB_HANDLER_INT32,
@@ -3181,7 +4056,8 @@ bool upb_fieldtype_mapkeyok(upb_fieldtype_t type) {
 void *upb_array_pack(const upb_array *arr, void *p, size_t *ofs, size_t size);
 void *upb_map_pack(const upb_map *map, void *p, size_t *ofs, size_t size);
 
-#define CHARPTR_AT(msg, ofs) ((char*)msg + ofs)
+#define PTR_AT(msg, ofs, type) (type*)((char*)msg + ofs)
+#define VOIDPTR_AT(msg, ofs) PTR_AT(msg, ofs, void)
 #define ENCODE_MAX_NESTING 64
 #define CHECK_TRUE(x) if (!(x)) { return false; }
 
@@ -3223,12 +4099,20 @@ static size_t upb_msgval_sizeof(upb_fieldtype_t type) {
     case UPB_TYPE_MESSAGE:
       return sizeof(void*);
     case UPB_TYPE_STRING:
-      return sizeof(char*) + sizeof(size_t);
+      return sizeof(upb_stringview);
   }
   UPB_UNREACHABLE();
 }
 
-static uint8_t upb_msg_fieldsize(const upb_fielddef *f) {
+static uint8_t upb_msg_fieldsize(const upb_msglayout_fieldinit_v1 *field) {
+  if (field->label == UPB_LABEL_REPEATED) {
+    return sizeof(void*);
+  } else {
+    return upb_msgval_sizeof(field->type);
+  }
+}
+
+static uint8_t upb_msg_fielddefsize(const upb_fielddef *f) {
   if (upb_fielddef_isseq(f)) {
     return sizeof(void*);
   } else {
@@ -3272,7 +4156,6 @@ static upb_ctype_t upb_fieldtotabtype(upb_fieldtype_t type) {
 }
 
 static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
-  /* TODO(haberman): improve/optimize this (maybe use upb_msgval in fielddef) */
   switch (upb_fielddef_type(f)) {
       case UPB_TYPE_FLOAT:
         return upb_msgval_float(upb_fielddef_defaultfloat(f));
@@ -3284,7 +4167,7 @@ static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
       case UPB_TYPE_BYTES: {
         size_t len;
         const char *ptr = upb_fielddef_defaultstr(f, &len);
-        return upb_msgval_str(ptr, len);
+        return upb_msgval_makestr(ptr, len);
       }
       case UPB_TYPE_MESSAGE:
         return upb_msgval_msg(NULL);
@@ -3307,63 +4190,44 @@ static upb_msgval upb_msgval_fromdefault(const upb_fielddef *f) {
 /** upb_msglayout *************************************************************/
 
 struct upb_msglayout {
-  upb_msgfactory *factory;
-  const upb_msgdef *msgdef;
-  size_t size;
-  size_t extdict_offset;
-  void *default_msg;
-  uint32_t *field_offsets;
-  uint32_t *case_offsets;
-  uint32_t *hasbits;
-  bool has_extdict;
-  uint8_t align;
+  struct upb_msglayout_msginit_v1 data;
 };
 
-static void upb_msg_checkfield(const upb_msglayout *l, const upb_fielddef *f) {
-  UPB_ASSERT(l->msgdef == upb_fielddef_containingtype(f));
-}
-
 static void upb_msglayout_free(upb_msglayout *l) {
-  upb_gfree(l->default_msg);
+  upb_gfree(l->data.default_msg);
   upb_gfree(l);
 }
 
-const upb_msgdef *upb_msglayout_msgdef(const upb_msglayout *l) {
-  return l->msgdef;
-}
-
 static size_t upb_msglayout_place(upb_msglayout *l, size_t size) {
   size_t ret;
 
-  l->size = align_up(l->size, size);
-  l->align = align_up(l->align, size);
-  ret = l->size;
-  l->size += size;
+  l->data.size = align_up(l->data.size, size);
+  ret = l->data.size;
+  l->data.size += size;
   return ret;
 }
 
 static uint32_t upb_msglayout_offset(const upb_msglayout *l,
                                      const upb_fielddef *f) {
-  return l->field_offsets[upb_fielddef_index(f)];
+  return l->data.fields[upb_fielddef_index(f)].offset;
 }
 
 static uint32_t upb_msglayout_hasbit(const upb_msglayout *l,
                                      const upb_fielddef *f) {
-  return l->hasbits[upb_fielddef_index(f)];
+  return l->data.fields[upb_fielddef_index(f)].hasbit;
 }
 
-static bool upb_msglayout_initdefault(upb_msglayout *l) {
-  const upb_msgdef *m = l->msgdef;
+static bool upb_msglayout_initdefault(upb_msglayout *l, const upb_msgdef *m) {
   upb_msg_field_iter it;
 
-  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2 && l->size) {
+  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2 && l->data.size) {
     /* Allocate default message and set default values in it. */
-    l->default_msg = upb_gmalloc(l->size);
-    if (!l->default_msg) {
+    l->data.default_msg = upb_gmalloc(l->data.size);
+    if (!l->data.default_msg) {
       return false;
     }
 
-    memset(l->default_msg, 0, l->size);
+    memset(l->data.default_msg, 0, l->data.size);
 
     for (upb_msg_field_begin(&it, m); !upb_msg_field_done(&it);
          upb_msg_field_next(&it)) {
@@ -3373,10 +4237,14 @@ static bool upb_msglayout_initdefault(upb_msglayout *l) {
         continue;
       }
 
+      /* TODO(haberman): handle strings. */
       if (!upb_fielddef_isstring(f) &&
           !upb_fielddef_issubmsg(f) &&
           !upb_fielddef_isseq(f)) {
-        upb_msg_set(l->default_msg, f, upb_msgval_fromdefault(f), l);
+        upb_msg_set(l->data.default_msg,
+                    upb_fielddef_index(f),
+                    upb_msgval_fromdefault(f),
+                    l);
       }
     }
   }
@@ -3389,22 +4257,46 @@ static upb_msglayout *upb_msglayout_new(const upb_msgdef *m) {
   upb_msg_oneof_iter oit;
   upb_msglayout *l;
   size_t hasbit;
-  size_t array_size = upb_msgdef_numfields(m) + upb_msgdef_numoneofs(m);
+  size_t submsg_count = 0;
+  const upb_msglayout_msginit_v1 **submsgs;
+  upb_msglayout_fieldinit_v1 *fields;
+  upb_msglayout_oneofinit_v1 *oneofs;
 
-  if (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2) {
-    array_size += upb_msgdef_numfields(m);  /* hasbits. */
+  for (upb_msg_field_begin(&it, m);
+       !upb_msg_field_done(&it);
+       upb_msg_field_next(&it)) {
+    const upb_fielddef* f = upb_msg_iter_field(&it);
+    if (upb_fielddef_issubmsg(f)) {
+      submsg_count++;
+    }
   }
 
-  l = upb_gmalloc(sizeof(*l) + (sizeof(uint32_t) * array_size));
+  l = upb_gmalloc(sizeof(*l));
   if (!l) return NULL;
 
   memset(l, 0, sizeof(*l));
 
-  l->msgdef = m;
-  l->align = 1;
-  l->field_offsets = (uint32_t*)CHARPTR_AT(l, sizeof(*l));
-  l->case_offsets = l->field_offsets + upb_msgdef_numfields(m);
-  l->hasbits = l->case_offsets + upb_msgdef_numoneofs(m);
+  fields = upb_gmalloc(upb_msgdef_numfields(m) * sizeof(*fields));
+  submsgs = upb_gmalloc(submsg_count * sizeof(*submsgs));
+  oneofs = upb_gmalloc(upb_msgdef_numoneofs(m) * sizeof(*oneofs));
+
+  if ((!fields && upb_msgdef_numfields(m)) ||
+      (!submsgs && submsg_count) ||
+      (!oneofs && upb_msgdef_numoneofs(m))) {
+    /* OOM. */
+    upb_gfree(l);
+    upb_gfree(fields);
+    upb_gfree(submsgs);
+    upb_gfree(oneofs);
+    return NULL;
+  }
+
+  l->data.field_count = upb_msgdef_numfields(m);
+  l->data.oneof_count = upb_msgdef_numoneofs(m);
+  l->data.fields = fields;
+  l->data.submsgs = submsgs;
+  l->data.oneofs = oneofs;
+  l->data.is_proto2 = (upb_msgdef_syntax(m) == UPB_SYNTAX_PROTO2);
 
   /* Allocate data offsets in three stages:
    *
@@ -3415,74 +4307,75 @@ static upb_msglayout *upb_msglayout_new(const upb_msgdef *m) {
    * OPT: There is a lot of room for optimization here to minimize the size.
    */
 
-  /* Allocate hasbits.  Start at sizeof(void*) for upb_alloc*. */
-  for (upb_msg_field_begin(&it, m), hasbit = sizeof(void*) * 8;
+  /* Allocate hasbits and set basic field attributes. */
+  for (upb_msg_field_begin(&it, m), hasbit = 0;
        !upb_msg_field_done(&it);
        upb_msg_field_next(&it)) {
     const upb_fielddef* f = upb_msg_iter_field(&it);
+    upb_msglayout_fieldinit_v1 *field = &fields[upb_fielddef_index(f)];
+
+    field->number = upb_fielddef_number(f);
+    field->type = upb_fielddef_type(f);
+    field->label = upb_fielddef_label(f);
+
+    if (upb_fielddef_containingoneof(f)) {
+      field->oneof_index = upb_oneofdef_index(upb_fielddef_containingoneof(f));
+    } else {
+      field->oneof_index = UPB_NOT_IN_ONEOF;
+    }
 
     if (upb_fielddef_haspresence(f) && !upb_fielddef_containingoneof(f)) {
-      l->hasbits[upb_fielddef_index(f)] = hasbit++;
+      field->hasbit = hasbit++;
     }
   }
 
   /* Account for space used by hasbits. */
-  l->size = div_round_up(hasbit, 8);
+  l->data.size = div_round_up(hasbit, 8);
 
   /* Allocate non-oneof fields. */
   for (upb_msg_field_begin(&it, m); !upb_msg_field_done(&it);
        upb_msg_field_next(&it)) {
     const upb_fielddef* f = upb_msg_iter_field(&it);
-    size_t field_size = upb_msg_fieldsize(f);
+    size_t field_size = upb_msg_fielddefsize(f);
     size_t index = upb_fielddef_index(f);
 
-
     if (upb_fielddef_containingoneof(f)) {
       /* Oneofs are handled separately below. */
       continue;
     }
 
-    l->field_offsets[index] = upb_msglayout_place(l, field_size);
+    fields[index].offset = upb_msglayout_place(l, field_size);
   }
 
   /* Allocate oneof fields.  Each oneof field consists of a uint32 for the case
    * and space for the actual data. */
   for (upb_msg_oneof_begin(&oit, m); !upb_msg_oneof_done(&oit);
        upb_msg_oneof_next(&oit)) {
-    const upb_oneofdef* oneof = upb_msg_iter_oneof(&oit);
+    const upb_oneofdef* o = upb_msg_iter_oneof(&oit);
     upb_oneof_iter fit;
+
     size_t case_size = sizeof(uint32_t);  /* Could potentially optimize this. */
+    upb_msglayout_oneofinit_v1 *oneof = &oneofs[upb_oneofdef_index(o)];
     size_t field_size = 0;
-    size_t case_offset;
-    size_t val_offset;
 
     /* Calculate field size: the max of all field sizes. */
-    for (upb_oneof_begin(&fit, oneof);
+    for (upb_oneof_begin(&fit, o);
          !upb_oneof_done(&fit);
          upb_oneof_next(&fit)) {
       const upb_fielddef* f = upb_oneof_iter_field(&fit);
-      field_size = UPB_MAX(field_size, upb_msg_fieldsize(f));
+      field_size = UPB_MAX(field_size, upb_msg_fielddefsize(f));
     }
 
     /* Align and allocate case offset. */
-    case_offset = upb_msglayout_place(l, case_size);
-    val_offset = upb_msglayout_place(l, field_size);
-
-    l->case_offsets[upb_oneofdef_index(oneof)] = case_offset;
-
-    /* Assign all fields in the oneof this same offset. */
-    for (upb_oneof_begin(&fit, oneof); !upb_oneof_done(&fit);
-         upb_oneof_next(&fit)) {
-      const upb_fielddef* f = upb_oneof_iter_field(&fit);
-      l->field_offsets[upb_fielddef_index(f)] = val_offset;
-    }
+    oneof->case_offset = upb_msglayout_place(l, case_size);
+    oneof->data_offset = upb_msglayout_place(l, field_size);
   }
 
   /* Size of the entire structure should be a multiple of its greatest
-   * alignment. */
-  l->size = align_up(l->size, l->align);
+   * alignment.  TODO: track overall alignment for real? */
+  l->data.size = align_up(l->data.size, 8);
 
-  if (upb_msglayout_initdefault(l)) {
+  if (upb_msglayout_initdefault(l, m)) {
     return l;
   } else {
     upb_msglayout_free(l);
@@ -3490,10 +4383,6 @@ static upb_msglayout *upb_msglayout_new(const upb_msgdef *m) {
   }
 }
 
-upb_msgfactory *upb_msglayout_factory(const upb_msglayout *layout) {
-  return layout->factory;
-}
-
 
 /** upb_msgfactory ************************************************************/
 
@@ -3550,7 +4439,6 @@ const upb_msglayout *upb_msgfactory_getlayout(upb_msgfactory *f,
     upb_msglayout *l = upb_msglayout_new(m);
     upb_inttable_insertptr(&mutable_f->layouts, m, upb_value_ptr(l));
     UPB_ASSERT(l);
-    l->factory = f;
     return l;
   }
 }
@@ -3559,16 +4447,15 @@ const upb_msglayout *upb_msgfactory_getlayout(upb_msgfactory *f,
 
 void *upb_msg_startstr(void *msg, const void *hd, size_t size_hint) {
   uint32_t ofs = (uintptr_t)hd;
-  /* We pass NULL here because we know we can get away with it. */
-  upb_alloc *alloc = upb_msg_alloc(msg, NULL);
+  upb_alloc *alloc = upb_msg_alloc(msg);
   upb_msgval val;
   UPB_UNUSED(size_hint);
 
   val = upb_msgval_read(msg, ofs, upb_msgval_sizeof(UPB_TYPE_STRING));
 
-  upb_free(alloc, (void*)val.str.ptr);
-  val.str.ptr = NULL;
-  val.str.len = 0;
+  upb_free(alloc, (void*)val.str.data);
+  val.str.data = NULL;
+  val.str.size = 0;
 
   upb_msgval_write(msg, ofs, val, upb_msgval_sizeof(UPB_TYPE_STRING));
   return msg;
@@ -3577,23 +4464,22 @@ void *upb_msg_startstr(void *msg, const void *hd, size_t size_hint) {
 size_t upb_msg_str(void *msg, const void *hd, const char *ptr, size_t size,
                    const upb_bufhandle *handle) {
   uint32_t ofs = (uintptr_t)hd;
-  /* We pass NULL here because we know we can get away with it. */
-  upb_alloc *alloc = upb_msg_alloc(msg, NULL);
+  upb_alloc *alloc = upb_msg_alloc(msg);
   upb_msgval val;
   size_t newsize;
   UPB_UNUSED(handle);
 
   val = upb_msgval_read(msg, ofs, upb_msgval_sizeof(UPB_TYPE_STRING));
 
-  newsize = val.str.len + size;
-  val.str.ptr = upb_realloc(alloc, (void*)val.str.ptr, val.str.len, newsize);
+  newsize = val.str.size + size;
+  val.str.data = upb_realloc(alloc, (void*)val.str.data, val.str.size, newsize);
 
-  if (!val.str.ptr) {
+  if (!val.str.data) {
     return false;
   }
 
-  memcpy((char*)val.str.ptr + val.str.len, ptr, size);
-  val.str.len = newsize;
+  memcpy((char*)val.str.data + val.str.size, ptr, size);
+  val.str.size = newsize;
   upb_msgval_write(msg, ofs, val, upb_msgval_sizeof(UPB_TYPE_STRING));
   return size;
 }
@@ -3658,13 +4544,14 @@ static upb_selector_t getsel2(const upb_fielddef *f, upb_handlertype_t type) {
 
 static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
                                  const upb_msglayout *layout) {
+  int field_index = upb_fielddef_index(f);
   if (upb_fielddef_isseq(f)) {
-    return upb_msgval_getarr(upb_msg_get(msg, f, layout)) != NULL;
+    return upb_msgval_getarr(upb_msg_get(msg, field_index, layout)) != NULL;
   } else if (upb_msgdef_syntax(upb_fielddef_containingtype(f)) ==
              UPB_SYNTAX_PROTO2) {
-    return upb_msg_has(msg, f, layout);
+    return upb_msg_has(msg, field_index, layout);
   } else {
-    upb_msgval val = upb_msg_get(msg, f, layout);
+    upb_msgval val = upb_msg_get(msg, field_index, layout);
     switch (upb_fielddef_type(f)) {
       case UPB_TYPE_FLOAT:
         return upb_msgval_getfloat(val) != 0;
@@ -3683,7 +4570,7 @@ static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
         return upb_msgval_getuint64(val) != 0;
       case UPB_TYPE_STRING:
       case UPB_TYPE_BYTES:
-        return upb_msgval_getstr(val) && upb_msgval_getstrlen(val) > 0;
+        return upb_msgval_getstr(val).size > 0;
       case UPB_TYPE_MESSAGE:
         return upb_msgval_getmsg(val) != NULL;
     }
@@ -3694,7 +4581,7 @@ static bool upb_visitor_hasfield(const upb_msg *msg, const upb_fielddef *f,
 static bool upb_visitor_visitmsg2(const upb_msg *msg,
                                   const upb_msglayout *layout, upb_sink *sink,
                                   int depth) {
-  const upb_msgdef *md = upb_msglayout_msgdef(layout);
+  const upb_msgdef *md = upb_handlers_msgdef(sink->handlers);
   upb_msg_field_iter i;
   upb_status status;
 
@@ -3716,7 +4603,7 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
       continue;
     }
 
-    val = upb_msg_get(msg, f, layout);
+    val = upb_msg_get(msg, upb_fielddef_index(f), layout);
 
     if (upb_fielddef_isseq(f)) {
       const upb_array *arr = upb_msgval_getarr(val);
@@ -3737,8 +4624,7 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
           CHECK_TRUE(upb_sink_putfloat(sink, sel, upb_msgval_getfloat(val)));
           break;
         case UPB_TYPE_DOUBLE:
-          CHECK_TRUE(
-              upb_sink_putdouble(sink, sel, upb_msgval_getdouble(val)));
+          CHECK_TRUE(upb_sink_putdouble(sink, sel, upb_msgval_getdouble(val)));
           break;
         case UPB_TYPE_BOOL:
           CHECK_TRUE(upb_sink_putbool(sink, sel, upb_msgval_getbool(val)));
@@ -3748,15 +4634,13 @@ static bool upb_visitor_visitmsg2(const upb_msg *msg,
           CHECK_TRUE(upb_sink_putint32(sink, sel, upb_msgval_getint32(val)));
           break;
         case UPB_TYPE_UINT32:
-          CHECK_TRUE(
-              upb_sink_putuint32(sink, sel, upb_msgval_getuint32(val)));
+          CHECK_TRUE(upb_sink_putuint32(sink, sel, upb_msgval_getuint32(val)));
           break;
         case UPB_TYPE_INT64:
           CHECK_TRUE(upb_sink_putint64(sink, sel, upb_msgval_getint64(val)));
           break;
         case UPB_TYPE_UINT64:
-          CHECK_TRUE(
-              upb_sink_putuint64(sink, sel, upb_msgval_getuint64(val)));
+          CHECK_TRUE(upb_sink_putuint64(sink, sel, upb_msgval_getuint64(val)));
           break;
         case UPB_TYPE_STRING:
         case UPB_TYPE_BYTES:
@@ -3788,194 +4672,160 @@ bool upb_visitor_visitmsg(upb_visitor *visitor, const upb_msg *msg) {
 /* If we always read/write as a consistent type to each address, this shouldn't
  * violate aliasing.
  */
-#define DEREF(msg, ofs, type) *(type*)CHARPTR_AT(msg, ofs)
+#define DEREF(msg, ofs, type) *PTR_AT(msg, ofs, type)
 
-static upb_inttable *upb_msg_trygetextdict(const upb_msg *msg,
-                                           const upb_msglayout *l) {
-  return l->has_extdict ? DEREF(msg, l->extdict_offset, upb_inttable*) : NULL;
-}
-
-static upb_inttable *upb_msg_getextdict(upb_msg *msg,
-                                        const upb_msglayout *l,
-                                        upb_alloc *a) {
-  upb_inttable *ext_dict;
-  UPB_ASSERT(l->has_extdict);
+/* Internal members of a upb_msg.  We can change this without breaking binary
+ * compatibility.  We put these before the user's data.  The user's upb_msg*
+ * points after the upb_msg_internal. */
 
-  ext_dict = upb_msg_trygetextdict(msg, l);
+/* Used when a message is not extendable. */
+typedef struct {
+  /* TODO(haberman): add unknown fields. */
+  upb_alloc *alloc;
+} upb_msg_internal;
 
-  if (!ext_dict) {
-    ext_dict = upb_malloc(a, sizeof(upb_inttable));
+/* Used when a message is extendable. */
+typedef struct {
+  upb_inttable *extdict;
+  upb_msg_internal base;
+} upb_msg_internal_withext;
 
-    if (!ext_dict) {
-      return NULL;
-    }
+static int upb_msg_internalsize(const upb_msglayout *l) {
+    return sizeof(upb_msg_internal) - l->data.extendable * sizeof(void*);
+}
 
-    /* Use an 8-byte type to ensure all bytes are copied. */
-    if (!upb_inttable_init2(ext_dict, UPB_CTYPE_INT64, a)) {
-      upb_free(a, ext_dict);
-      return NULL;
-    }
+static upb_msg_internal *upb_msg_getinternal(upb_msg *msg) {
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+}
 
-    DEREF(msg, l->extdict_offset, upb_inttable*) = ext_dict;
-  }
+static const upb_msg_internal *upb_msg_getinternal_const(const upb_msg *msg) {
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
+}
 
-  return ext_dict;
+static upb_msg_internal_withext *upb_msg_getinternalwithext(
+    upb_msg *msg, const upb_msglayout *l) {
+  UPB_ASSERT(l->data.extendable);
+  return VOIDPTR_AT(msg, -sizeof(upb_msg_internal_withext));
 }
 
-static uint32_t upb_msg_getoneofint(const upb_msg *msg,
-                                    const upb_oneofdef *o,
-                                    const upb_msglayout *l) {
-  size_t oneof_ofs = l->case_offsets[upb_oneofdef_index(o)];
-  return DEREF(msg, oneof_ofs, uint8_t);
+static const upb_msglayout_fieldinit_v1 *upb_msg_checkfield(
+    int field_index, const upb_msglayout *l) {
+  UPB_ASSERT(field_index >= 0 && field_index < l->data.field_count);
+  return &l->data.fields[field_index];
 }
 
-static void upb_msg_setoneofcase(const upb_msg *msg,
-                                 const upb_oneofdef *o,
-                                 const upb_msglayout *l,
-                                 uint32_t val) {
-  size_t oneof_ofs = l->case_offsets[upb_oneofdef_index(o)];
-  DEREF(msg, oneof_ofs, uint8_t) = val;
+static bool upb_msg_inoneof(const upb_msglayout_fieldinit_v1 *field) {
+  return field->oneof_index != UPB_NOT_IN_ONEOF;
 }
 
+static uint32_t *upb_msg_oneofcase(const upb_msg *msg, int field_index,
+                                   const upb_msglayout *l) {
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  UPB_ASSERT(upb_msg_inoneof(field));
+  return PTR_AT(msg, l->data.oneofs[field->oneof_index].case_offset, uint32_t);
+}
 
-static bool upb_msg_oneofis(const upb_msg *msg, const upb_msglayout *l,
-                            const upb_oneofdef *o, const upb_fielddef *f) {
-  return upb_msg_getoneofint(msg, o, l) == upb_fielddef_number(f);
+size_t upb_msg_sizeof(const upb_msglayout *l) {
+  return l->data.size + upb_msg_internalsize(l);
 }
 
-size_t upb_msg_sizeof(const upb_msglayout *l) { return l->size; }
+upb_msg *upb_msg_init(void *mem, const upb_msglayout *l, upb_alloc *a) {
+  upb_msg *msg = VOIDPTR_AT(mem, upb_msg_internalsize(l));
 
-void upb_msg_init(upb_msg *msg, const upb_msglayout *l, upb_alloc *a) {
-  if (l->default_msg) {
-    memcpy(msg, l->default_msg, l->size);
+  /* Initialize normal members. */
+  if (l->data.default_msg) {
+    memcpy(msg, l->data.default_msg, l->data.size);
   } else {
-    memset(msg, 0, l->size);
+    memset(msg, 0, l->data.size);
   }
 
-  /* Set arena pointer. */
-  memcpy(msg, &a, sizeof(a));
-}
+  /* Initialize internal members. */
+  upb_msg_getinternal(msg)->alloc = a;
 
-void upb_msg_uninit(upb_msg *msg, const upb_msglayout *l) {
-  upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-  if (ext_dict) {
-    upb_inttable_uninit2(ext_dict, upb_msg_alloc(msg, l));
+  if (l->data.extendable) {
+    upb_msg_getinternalwithext(msg, l)->extdict = NULL;
   }
-}
 
-upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a) {
-  upb_msg *msg = upb_malloc(a, upb_msg_sizeof(l));
+  return msg;
+}
 
-  if (msg) {
-    upb_msg_init(msg, l, a);
+void *upb_msg_uninit(upb_msg *msg, const upb_msglayout *l) {
+  if (l->data.extendable) {
+    upb_inttable *ext_dict = upb_msg_getinternalwithext(msg, l)->extdict;
+    if (ext_dict) {
+      upb_inttable_uninit2(ext_dict, upb_msg_alloc(msg));
+      upb_free(upb_msg_alloc(msg), ext_dict);
+    }
   }
 
-  return msg;
+  return VOIDPTR_AT(msg, -upb_msg_internalsize(l));
+}
+
+upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a) {
+  void *mem = upb_malloc(a, upb_msg_sizeof(l));
+  return mem ? upb_msg_init(mem, l, a) : NULL;
 }
 
 void upb_msg_free(upb_msg *msg, const upb_msglayout *l) {
-  upb_msg_uninit(msg, l);
-  upb_free(upb_msg_alloc(msg, l), msg);
+  upb_free(upb_msg_alloc(msg), upb_msg_uninit(msg, l));
 }
 
-upb_alloc *upb_msg_alloc(const upb_msg *msg, const upb_msglayout *l) {
-  upb_alloc *alloc;
-  UPB_UNUSED(l);
-  memcpy(&alloc, msg, sizeof(alloc));
-  return alloc;
+upb_alloc *upb_msg_alloc(const upb_msg *msg) {
+  return upb_msg_getinternal_const(msg)->alloc;
 }
 
 bool upb_msg_has(const upb_msg *msg,
-                 const upb_fielddef *f,
+                 int field_index,
                  const upb_msglayout *l) {
-  const upb_oneofdef *o;
-  upb_msg_checkfield(l, f);
-  UPB_ASSERT(upb_fielddef_haspresence(f));
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
 
-  if (upb_fielddef_isextension(f)) {
-    /* Extensions are set when they are present in the extension dict. */
-    upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-    upb_value v;
-    return ext_dict != NULL &&
-           upb_inttable_lookup32(ext_dict, upb_fielddef_number(f), &v);
-  } else if ((o = upb_fielddef_containingoneof(f)) != NULL) {
+  UPB_ASSERT(l->data.is_proto2);
+
+  if (upb_msg_inoneof(field)) {
     /* Oneofs are set when the oneof number is set to this field. */
-    return upb_msg_getoneofint(msg, o, l) == upb_fielddef_number(f);
+    return *upb_msg_oneofcase(msg, field_index, l) == field->number;
   } else {
     /* Other fields are set when their hasbit is set. */
-    uint32_t hasbit = l->hasbits[upb_fielddef_index(f)];
+    uint32_t hasbit = l->data.fields[field_index].hasbit;
     return DEREF(msg, hasbit / 8, char) | (1 << (hasbit % 8));
   }
 }
 
-upb_msgval upb_msg_get(const upb_msg *msg, const upb_fielddef *f,
+upb_msgval upb_msg_get(const upb_msg *msg, int field_index,
                        const upb_msglayout *l) {
-  upb_msg_checkfield(l, f);
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  int size = upb_msg_fieldsize(field);
 
-  if (upb_fielddef_isextension(f)) {
-    upb_inttable *ext_dict = upb_msg_trygetextdict(msg, l);
-    upb_value val;
-    if (upb_inttable_lookup32(ext_dict, upb_fielddef_number(f), &val)) {
-      return upb_msgval_fromval(val);
+  if (upb_msg_inoneof(field)) {
+    if (*upb_msg_oneofcase(msg, field_index, l) == field->number) {
+      size_t ofs = l->data.oneofs[field->oneof_index].data_offset;
+      return upb_msgval_read(msg, ofs, size);
     } else {
-      return upb_msgval_fromdefault(f);
+      /* Return default. */
+      return upb_msgval_read(l->data.default_msg, field->offset, size);
     }
   } else {
-    size_t ofs = l->field_offsets[upb_fielddef_index(f)];
-    const upb_oneofdef *o = upb_fielddef_containingoneof(f);
-    upb_msgval ret;
-
-    if (o && !upb_msg_oneofis(msg, l, o, f)) {
-      /* Oneof defaults can't come from the message because the memory is reused
-       * by all types in the oneof. */
-      return upb_msgval_fromdefault(f);
-    }
-
-    ret = upb_msgval_read(msg, ofs, upb_msg_fieldsize(f));
-    return ret;
+    return upb_msgval_read(msg, field->offset, size);
   }
 }
 
-bool upb_msg_set(upb_msg *msg,
-                 const upb_fielddef *f,
-                 upb_msgval val,
+void upb_msg_set(upb_msg *msg, int field_index, upb_msgval val,
                  const upb_msglayout *l) {
-  upb_alloc *a = upb_msg_alloc(msg, l);
-  upb_msg_checkfield(l, f);
-
-  if (upb_fielddef_isextension(f)) {
-    /* TODO(haberman): introduce table API that can do this in one call. */
-    upb_inttable *ext = upb_msg_getextdict(msg, l, a);
-    upb_value val2 = upb_toval(val);
-    if (!upb_inttable_replace(ext, upb_fielddef_number(f), val2) &&
-        !upb_inttable_insert2(ext, upb_fielddef_number(f), val2, a)) {
-      return false;
-    }
-  } else {
-    size_t ofs = l->field_offsets[upb_fielddef_index(f)];
-    const upb_oneofdef *o = upb_fielddef_containingoneof(f);
-
-    if (o) {
-      upb_msg_setoneofcase(msg, o, l, upb_fielddef_number(f));
-    }
+  const upb_msglayout_fieldinit_v1 *field = upb_msg_checkfield(field_index, l);
+  int size = upb_msg_fieldsize(field);
 
-    upb_msgval_write(msg, ofs, val, upb_msg_fieldsize(f));
+  if (upb_msg_inoneof(field)) {
+    size_t ofs = l->data.oneofs[field->oneof_index].data_offset;
+    *upb_msg_oneofcase(msg, field_index, l) = field->number;
+    upb_msgval_write(msg, ofs, val, size);
+  } else {
+    upb_msgval_write(msg, field->offset, val, size);
   }
-  return true;
 }
 
 
 /** upb_array *****************************************************************/
 
-struct upb_array {
-  upb_fieldtype_t type;
-  uint8_t element_size;
-  void *data;   /* Each element is element_size. */
-  size_t len;   /* Measured in elements. */
-  size_t size;  /* Measured in elements. */
-  upb_alloc *alloc;
-};
-
 #define DEREF_ARR(arr, i, type) ((type*)arr->data)[i]
 
 size_t upb_array_sizeof(upb_fieldtype_t type) {
@@ -4070,8 +4920,8 @@ static void upb_map_tokey(upb_fieldtype_t type, upb_msgval *key,
   switch (type) {
     case UPB_TYPE_STRING:
       /* Point to string data of the input key. */
-      *out_key = key->str.ptr;
-      *out_len = key->str.len;
+      *out_key = key->str.data;
+      *out_len = key->str.size;
       return;
     case UPB_TYPE_BOOL:
     case UPB_TYPE_INT32:
@@ -4096,7 +4946,7 @@ static upb_msgval upb_map_fromkey(upb_fieldtype_t type, const char *key,
                                   size_t len) {
   switch (type) {
     case UPB_TYPE_STRING:
-      return upb_msgval_str(key, len);
+      return upb_msgval_makestr(key, len);
     case UPB_TYPE_BOOL:
     case UPB_TYPE_INT32:
     case UPB_TYPE_UINT32:
@@ -6545,162 +7395,164 @@ size_t upb_env_bytesallocated(const upb_env *e) {
 
 
 static const upb_msgdef msgs[22];
-static const upb_fielddef fields[105];
+static const upb_fielddef fields[107];
 static const upb_enumdef enums[5];
 static const upb_tabent strentries[236];
 static const upb_tabent intentries[18];
-static const upb_tabval arrays[184];
+static const upb_tabval arrays[187];
 
 #ifdef UPB_DEBUG_REFS
-static upb_inttable reftables[264];
+static upb_inttable reftables[268];
 #endif
 
 static const upb_msgdef msgs[22] = {
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto", 40, 8, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[0], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[0]), false, UPB_SYNTAX_PROTO2, &reftables[0], &reftables[1]),
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ExtensionRange", 4, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[11], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[16]), false, UPB_SYNTAX_PROTO2, &reftables[2], &reftables[3]),
-  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ReservedRange", 4, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[14], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[20]), false, UPB_SYNTAX_PROTO2, &reftables[4], &reftables[5]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumDescriptorProto", 11, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[17], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[24]), false, UPB_SYNTAX_PROTO2, &reftables[6], &reftables[7]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumOptions", 8, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[0], &arrays[21], 4, 2), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[28]), false, UPB_SYNTAX_PROTO2, &reftables[8], &reftables[9]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumValueDescriptorProto", 8, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[25], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[32]), false, UPB_SYNTAX_PROTO2, &reftables[10], &reftables[11]),
-  UPB_MSGDEF_INIT("google.protobuf.EnumValueOptions", 7, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[2], &arrays[29], 2, 1), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[36]), false, UPB_SYNTAX_PROTO2, &reftables[12], &reftables[13]),
-  UPB_MSGDEF_INIT("google.protobuf.FieldDescriptorProto", 23, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[31], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[40]), false, UPB_SYNTAX_PROTO2, &reftables[14], &reftables[15]),
-  UPB_MSGDEF_INIT("google.protobuf.FieldOptions", 12, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[4], &arrays[42], 11, 6), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[56]), false, UPB_SYNTAX_PROTO2, &reftables[16], &reftables[17]),
-  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorProto", 42, 6, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[53], 13, 12), UPB_STRTABLE_INIT(12, 15, UPB_CTYPE_PTR, 4, &strentries[72]), false, UPB_SYNTAX_PROTO2, &reftables[18], &reftables[19]),
-  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorSet", 6, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[66], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[88]), false, UPB_SYNTAX_PROTO2, &reftables[20], &reftables[21]),
-  UPB_MSGDEF_INIT("google.protobuf.FileOptions", 31, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[6], &arrays[68], 39, 15), UPB_STRTABLE_INIT(16, 31, UPB_CTYPE_PTR, 5, &strentries[92]), false, UPB_SYNTAX_PROTO2, &reftables[22], &reftables[23]),
-  UPB_MSGDEF_INIT("google.protobuf.MessageOptions", 10, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[8], &arrays[107], 8, 4), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[124]), false, UPB_SYNTAX_PROTO2, &reftables[24], &reftables[25]),
-  UPB_MSGDEF_INIT("google.protobuf.MethodDescriptorProto", 15, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[115], 7, 6), UPB_STRTABLE_INIT(6, 7, UPB_CTYPE_PTR, 3, &strentries[132]), false, UPB_SYNTAX_PROTO2, &reftables[26], &reftables[27]),
-  UPB_MSGDEF_INIT("google.protobuf.MethodOptions", 7, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[10], &arrays[122], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[140]), false, UPB_SYNTAX_PROTO2, &reftables[28], &reftables[29]),
-  UPB_MSGDEF_INIT("google.protobuf.OneofDescriptorProto", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[123], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[144]), false, UPB_SYNTAX_PROTO2, &reftables[30], &reftables[31]),
-  UPB_MSGDEF_INIT("google.protobuf.ServiceDescriptorProto", 11, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[125], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[148]), false, UPB_SYNTAX_PROTO2, &reftables[32], &reftables[33]),
-  UPB_MSGDEF_INIT("google.protobuf.ServiceOptions", 7, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[14], &arrays[129], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[152]), false, UPB_SYNTAX_PROTO2, &reftables[34], &reftables[35]),
-  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo", 6, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[130], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[156]), false, UPB_SYNTAX_PROTO2, &reftables[36], &reftables[37]),
-  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo.Location", 19, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[132], 7, 5), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[160]), false, UPB_SYNTAX_PROTO2, &reftables[38], &reftables[39]),
-  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption", 18, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[139], 9, 7), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[168]), false, UPB_SYNTAX_PROTO2, &reftables[40], &reftables[41]),
-  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption.NamePart", 6, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[148], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[184]), false, UPB_SYNTAX_PROTO2, &reftables[42], &reftables[43]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto", 41, 8, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[0], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[0]), false, UPB_SYNTAX_PROTO2, &reftables[0], &reftables[1]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ExtensionRange", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[11], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[16]), false, UPB_SYNTAX_PROTO2, &reftables[2], &reftables[3]),
+  UPB_MSGDEF_INIT("google.protobuf.DescriptorProto.ReservedRange", 5, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[14], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[20]), false, UPB_SYNTAX_PROTO2, &reftables[4], &reftables[5]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumDescriptorProto", 12, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[17], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[24]), false, UPB_SYNTAX_PROTO2, &reftables[6], &reftables[7]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumOptions", 9, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[0], &arrays[21], 4, 2), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[28]), false, UPB_SYNTAX_PROTO2, &reftables[8], &reftables[9]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumValueDescriptorProto", 9, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[25], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[32]), false, UPB_SYNTAX_PROTO2, &reftables[10], &reftables[11]),
+  UPB_MSGDEF_INIT("google.protobuf.EnumValueOptions", 8, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[2], &arrays[29], 2, 1), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[36]), false, UPB_SYNTAX_PROTO2, &reftables[12], &reftables[13]),
+  UPB_MSGDEF_INIT("google.protobuf.FieldDescriptorProto", 24, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[31], 11, 10), UPB_STRTABLE_INIT(10, 15, UPB_CTYPE_PTR, 4, &strentries[40]), false, UPB_SYNTAX_PROTO2, &reftables[14], &reftables[15]),
+  UPB_MSGDEF_INIT("google.protobuf.FieldOptions", 13, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[4], &arrays[42], 11, 6), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[56]), false, UPB_SYNTAX_PROTO2, &reftables[16], &reftables[17]),
+  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorProto", 43, 6, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[53], 13, 12), UPB_STRTABLE_INIT(12, 15, UPB_CTYPE_PTR, 4, &strentries[72]), false, UPB_SYNTAX_PROTO2, &reftables[18], &reftables[19]),
+  UPB_MSGDEF_INIT("google.protobuf.FileDescriptorSet", 7, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[66], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[88]), false, UPB_SYNTAX_PROTO2, &reftables[20], &reftables[21]),
+  UPB_MSGDEF_INIT("google.protobuf.FileOptions", 38, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[6], &arrays[68], 42, 17), UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_PTR, 5, &strentries[92]), false, UPB_SYNTAX_PROTO2, &reftables[22], &reftables[23]),
+  UPB_MSGDEF_INIT("google.protobuf.MessageOptions", 11, 1, UPB_INTTABLE_INIT(1, 1, UPB_CTYPE_PTR, 1, &intentries[8], &arrays[110], 8, 4), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[124]), false, UPB_SYNTAX_PROTO2, &reftables[24], &reftables[25]),
+  UPB_MSGDEF_INIT("google.protobuf.MethodDescriptorProto", 16, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[118], 7, 6), UPB_STRTABLE_INIT(6, 7, UPB_CTYPE_PTR, 3, &strentries[132]), false, UPB_SYNTAX_PROTO2, &reftables[26], &reftables[27]),
+  UPB_MSGDEF_INIT("google.protobuf.MethodOptions", 8, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[10], &arrays[125], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[140]), false, UPB_SYNTAX_PROTO2, &reftables[28], &reftables[29]),
+  UPB_MSGDEF_INIT("google.protobuf.OneofDescriptorProto", 6, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[126], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[144]), false, UPB_SYNTAX_PROTO2, &reftables[30], &reftables[31]),
+  UPB_MSGDEF_INIT("google.protobuf.ServiceDescriptorProto", 12, 2, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[128], 4, 3), UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_PTR, 2, &strentries[148]), false, UPB_SYNTAX_PROTO2, &reftables[32], &reftables[33]),
+  UPB_MSGDEF_INIT("google.protobuf.ServiceOptions", 8, 1, UPB_INTTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &intentries[14], &arrays[132], 1, 0), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[152]), false, UPB_SYNTAX_PROTO2, &reftables[34], &reftables[35]),
+  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo", 7, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[133], 2, 1), UPB_STRTABLE_INIT(1, 3, UPB_CTYPE_PTR, 2, &strentries[156]), false, UPB_SYNTAX_PROTO2, &reftables[36], &reftables[37]),
+  UPB_MSGDEF_INIT("google.protobuf.SourceCodeInfo.Location", 20, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[135], 7, 5), UPB_STRTABLE_INIT(5, 7, UPB_CTYPE_PTR, 3, &strentries[160]), false, UPB_SYNTAX_PROTO2, &reftables[38], &reftables[39]),
+  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption", 19, 1, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[142], 9, 7), UPB_STRTABLE_INIT(7, 15, UPB_CTYPE_PTR, 4, &strentries[168]), false, UPB_SYNTAX_PROTO2, &reftables[40], &reftables[41]),
+  UPB_MSGDEF_INIT("google.protobuf.UninterpretedOption.NamePart", 7, 0, UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_PTR, 0, NULL, &arrays[151], 3, 2), UPB_STRTABLE_INIT(2, 3, UPB_CTYPE_PTR, 2, &strentries[184]), false, UPB_SYNTAX_PROTO2, &reftables[42], &reftables[43]),
 };
 
-static const upb_fielddef fields[105] = {
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "aggregate_value", 8, &msgs[20], NULL, 15, 6, {0},&reftables[44], &reftables[45]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "allow_alias", 2, &msgs[4], NULL, 6, 1, {0},&reftables[46], &reftables[47]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_enable_arenas", 31, &msgs[11], NULL, 23, 12, {0},&reftables[48], &reftables[49]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_generic_services", 16, &msgs[11], NULL, 17, 6, {0},&reftables[50], &reftables[51]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "client_streaming", 5, &msgs[13], NULL, 13, 4, {0},&reftables[52], &reftables[53]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "csharp_namespace", 37, &msgs[11], NULL, 27, 14, {0},&reftables[54], &reftables[55]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "ctype", 1, &msgs[8], (const upb_def*)(&enums[2]), 6, 1, {0},&reftables[56], &reftables[57]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "default_value", 7, &msgs[7], NULL, 16, 7, {0},&reftables[58], &reftables[59]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "dependency", 3, &msgs[9], NULL, 30, 8, {0},&reftables[60], &reftables[61]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[12], NULL, 8, 3, {0},&reftables[62], &reftables[63]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[8], NULL, 8, 3, {0},&reftables[64], &reftables[65]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[14], NULL, 6, 1, {0},&reftables[66], &reftables[67]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 23, &msgs[11], NULL, 21, 10, {0},&reftables[68], &reftables[69]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[4], NULL, 7, 2, {0},&reftables[70], &reftables[71]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[17], NULL, 6, 1, {0},&reftables[72], &reftables[73]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 1, &msgs[6], NULL, 6, 1, {0},&reftables[74], &reftables[75]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, false, false, false, "double_value", 6, &msgs[20], NULL, 11, 4, {0},&reftables[76], &reftables[77]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[2], NULL, 3, 1, {0},&reftables[78], &reftables[79]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[1], NULL, 3, 1, {0},&reftables[80], &reftables[81]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 4, &msgs[0], (const upb_def*)(&msgs[3]), 18, 2, {0},&reftables[82], &reftables[83]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 5, &msgs[9], (const upb_def*)(&msgs[3]), 13, 1, {0},&reftables[84], &reftables[85]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "extendee", 2, &msgs[7], NULL, 7, 2, {0},&reftables[86], &reftables[87]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 6, &msgs[0], (const upb_def*)(&msgs[7]), 24, 4, {0},&reftables[88], &reftables[89]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 7, &msgs[9], (const upb_def*)(&msgs[7]), 19, 3, {0},&reftables[90], &reftables[91]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension_range", 5, &msgs[0], (const upb_def*)(&msgs[1]), 21, 3, {0},&reftables[92], &reftables[93]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "field", 2, &msgs[0], (const upb_def*)(&msgs[7]), 12, 0, {0},&reftables[94], &reftables[95]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "file", 1, &msgs[10], (const upb_def*)(&msgs[9]), 5, 0, {0},&reftables[96], &reftables[97]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "go_package", 11, &msgs[11], NULL, 14, 5, {0},&reftables[98], &reftables[99]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "identifier_value", 3, &msgs[20], NULL, 6, 1, {0},&reftables[100], &reftables[101]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "input_type", 2, &msgs[13], NULL, 7, 2, {0},&reftables[102], &reftables[103]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, false, false, false, "is_extension", 2, &msgs[21], NULL, 5, 1, {0},&reftables[104], &reftables[105]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generate_equals_and_hash", 20, &msgs[11], NULL, 20, 9, {0},&reftables[106], &reftables[107]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generic_services", 17, &msgs[11], NULL, 18, 7, {0},&reftables[108], &reftables[109]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_multiple_files", 10, &msgs[11], NULL, 13, 4, {0},&reftables[110], &reftables[111]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_outer_classname", 8, &msgs[11], NULL, 9, 2, {0},&reftables[112], &reftables[113]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_package", 1, &msgs[11], NULL, 6, 1, {0},&reftables[114], &reftables[115]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_string_check_utf8", 27, &msgs[11], NULL, 22, 11, {0},&reftables[116], &reftables[117]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "javanano_use_deprecated_package", 38, &msgs[11], NULL, 30, 15, {0},&reftables[118], &reftables[119]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "json_name", 10, &msgs[7], NULL, 20, 9, {0},&reftables[120], &reftables[121]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "jstype", 6, &msgs[8], (const upb_def*)(&enums[3]), 10, 5, {0},&reftables[122], &reftables[123]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "label", 4, &msgs[7], (const upb_def*)(&enums[0]), 11, 4, {0},&reftables[124], &reftables[125]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "lazy", 5, &msgs[8], NULL, 9, 4, {0},&reftables[126], &reftables[127]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "leading_comments", 3, &msgs[19], NULL, 8, 2, {0},&reftables[128], &reftables[129]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "leading_detached_comments", 6, &msgs[19], NULL, 16, 4, {0},&reftables[130], &reftables[131]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "location", 1, &msgs[18], (const upb_def*)(&msgs[19]), 5, 0, {0},&reftables[132], &reftables[133]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "map_entry", 7, &msgs[12], NULL, 9, 4, {0},&reftables[134], &reftables[135]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "message_set_wire_format", 1, &msgs[12], NULL, 6, 1, {0},&reftables[136], &reftables[137]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "message_type", 4, &msgs[9], (const upb_def*)(&msgs[0]), 10, 0, {0},&reftables[138], &reftables[139]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "method", 2, &msgs[16], (const upb_def*)(&msgs[13]), 6, 0, {0},&reftables[140], &reftables[141]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[3], NULL, 8, 2, {0},&reftables[142], &reftables[143]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[15], NULL, 2, 0, {0},&reftables[144], &reftables[145]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "name", 2, &msgs[20], (const upb_def*)(&msgs[21]), 5, 0, {0},&reftables[146], &reftables[147]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[0], NULL, 32, 8, {0},&reftables[148], &reftables[149]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[5], NULL, 4, 1, {0},&reftables[150], &reftables[151]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[9], NULL, 22, 6, {0},&reftables[152], &reftables[153]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[7], NULL, 4, 1, {0},&reftables[154], &reftables[155]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[13], NULL, 4, 1, {0},&reftables[156], &reftables[157]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[16], NULL, 8, 2, {0},&reftables[158], &reftables[159]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, false, false, false, "name_part", 1, &msgs[21], NULL, 2, 0, {0},&reftables[160], &reftables[161]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, false, false, false, "negative_int_value", 5, &msgs[20], NULL, 10, 3, {0},&reftables[162], &reftables[163]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "nested_type", 3, &msgs[0], (const upb_def*)(&msgs[0]), 15, 1, {0},&reftables[164], &reftables[165]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "no_standard_descriptor_accessor", 2, &msgs[12], NULL, 7, 2, {0},&reftables[166], &reftables[167]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 2, &msgs[5], NULL, 7, 2, {0},&reftables[168], &reftables[169]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 3, &msgs[7], NULL, 10, 3, {0},&reftables[170], &reftables[171]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "objc_class_prefix", 36, &msgs[11], NULL, 24, 13, {0},&reftables[172], &reftables[173]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "oneof_decl", 8, &msgs[0], (const upb_def*)(&msgs[15]), 28, 6, {0},&reftables[174], &reftables[175]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "oneof_index", 9, &msgs[7], NULL, 19, 8, {0},&reftables[176], &reftables[177]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "optimize_for", 9, &msgs[11], (const upb_def*)(&enums[4]), 12, 3, {0},&reftables[178], &reftables[179]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 7, &msgs[0], (const upb_def*)(&msgs[12]), 25, 5, {0},&reftables[180], &reftables[181]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[9], (const upb_def*)(&msgs[11]), 20, 4, {0},&reftables[182], &reftables[183]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 4, &msgs[13], (const upb_def*)(&msgs[14]), 3, 0, {0},&reftables[184], &reftables[185]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[7], (const upb_def*)(&msgs[8]), 3, 0, {0},&reftables[186], &reftables[187]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[16], (const upb_def*)(&msgs[17]), 7, 1, {0},&reftables[188], &reftables[189]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[5], (const upb_def*)(&msgs[6]), 3, 0, {0},&reftables[190], &reftables[191]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[3], (const upb_def*)(&msgs[4]), 7, 1, {0},&reftables[192], &reftables[193]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "output_type", 3, &msgs[13], NULL, 10, 3, {0},&reftables[194], &reftables[195]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "package", 2, &msgs[9], NULL, 25, 7, {0},&reftables[196], &reftables[197]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "packed", 2, &msgs[8], NULL, 7, 2, {0},&reftables[198], &reftables[199]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "path", 1, &msgs[19], NULL, 4, 0, {0},&reftables[200], &reftables[201]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, false, false, false, "positive_int_value", 4, &msgs[20], NULL, 9, 2, {0},&reftables[202], &reftables[203]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "public_dependency", 10, &msgs[9], NULL, 35, 9, {0},&reftables[204], &reftables[205]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "py_generic_services", 18, &msgs[11], NULL, 19, 8, {0},&reftables[206], &reftables[207]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "reserved_name", 10, &msgs[0], NULL, 37, 9, {0},&reftables[208], &reftables[209]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "reserved_range", 9, &msgs[0], (const upb_def*)(&msgs[2]), 31, 7, {0},&reftables[210], &reftables[211]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "server_streaming", 6, &msgs[13], NULL, 14, 5, {0},&reftables[212], &reftables[213]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "service", 6, &msgs[9], (const upb_def*)(&msgs[16]), 16, 2, {0},&reftables[214], &reftables[215]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "source_code_info", 9, &msgs[9], (const upb_def*)(&msgs[18]), 21, 5, {0},&reftables[216], &reftables[217]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "span", 2, &msgs[19], NULL, 7, 1, {0},&reftables[218], &reftables[219]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[2], NULL, 2, 0, {0},&reftables[220], &reftables[221]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[1], NULL, 2, 0, {0},&reftables[222], &reftables[223]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, false, false, false, "string_value", 7, &msgs[20], NULL, 12, 5, {0},&reftables[224], &reftables[225]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "syntax", 12, &msgs[9], NULL, 39, 11, {0},&reftables[226], &reftables[227]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "trailing_comments", 4, &msgs[19], NULL, 11, 3, {0},&reftables[228], &reftables[229]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "type", 5, &msgs[7], (const upb_def*)(&enums[1]), 12, 5, {0},&reftables[230], &reftables[231]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "type_name", 6, &msgs[7], NULL, 13, 6, {0},&reftables[232], &reftables[233]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[11], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[234], &reftables[235]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[12], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[236], &reftables[237]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[6], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[238], &reftables[239]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[4], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[240], &reftables[241]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[8], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[242], &reftables[243]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[14], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[244], &reftables[245]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[17], (const upb_def*)(&msgs[20]), 5, 0, {0},&reftables[246], &reftables[247]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "value", 2, &msgs[3], (const upb_def*)(&msgs[5]), 6, 0, {0},&reftables[248], &reftables[249]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "weak", 10, &msgs[8], NULL, 11, 6, {0},&reftables[250], &reftables[251]),
-  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "weak_dependency", 11, &msgs[9], NULL, 38, 10, {0},&reftables[252], &reftables[253]),
+static const upb_fielddef fields[107] = {
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "aggregate_value", 8, &msgs[20], NULL, 16, 6, {0},&reftables[44], &reftables[45]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "allow_alias", 2, &msgs[4], NULL, 7, 1, {0},&reftables[46], &reftables[47]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_enable_arenas", 31, &msgs[11], NULL, 24, 12, {0},&reftables[48], &reftables[49]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "cc_generic_services", 16, &msgs[11], NULL, 18, 6, {0},&reftables[50], &reftables[51]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "client_streaming", 5, &msgs[13], NULL, 14, 4, {0},&reftables[52], &reftables[53]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "csharp_namespace", 37, &msgs[11], NULL, 28, 14, {0},&reftables[54], &reftables[55]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "ctype", 1, &msgs[8], (const upb_def*)(&enums[2]), 7, 1, {0},&reftables[56], &reftables[57]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "default_value", 7, &msgs[7], NULL, 17, 7, {0},&reftables[58], &reftables[59]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "dependency", 3, &msgs[9], NULL, 31, 8, {0},&reftables[60], &reftables[61]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[8], NULL, 9, 3, {0},&reftables[62], &reftables[63]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[14], NULL, 7, 1, {0},&reftables[64], &reftables[65]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[12], NULL, 9, 3, {0},&reftables[66], &reftables[67]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 23, &msgs[11], NULL, 22, 10, {0},&reftables[68], &reftables[69]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 1, &msgs[6], NULL, 7, 1, {0},&reftables[70], &reftables[71]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 3, &msgs[4], NULL, 8, 2, {0},&reftables[72], &reftables[73]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "deprecated", 33, &msgs[17], NULL, 7, 1, {0},&reftables[74], &reftables[75]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_DOUBLE, 0, false, false, false, false, "double_value", 6, &msgs[20], NULL, 12, 4, {0},&reftables[76], &reftables[77]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[2], NULL, 4, 1, {0},&reftables[78], &reftables[79]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "end", 2, &msgs[1], NULL, 4, 1, {0},&reftables[80], &reftables[81]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 5, &msgs[9], (const upb_def*)(&msgs[3]), 14, 1, {0},&reftables[82], &reftables[83]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "enum_type", 4, &msgs[0], (const upb_def*)(&msgs[3]), 19, 2, {0},&reftables[84], &reftables[85]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "extendee", 2, &msgs[7], NULL, 8, 2, {0},&reftables[86], &reftables[87]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 6, &msgs[0], (const upb_def*)(&msgs[7]), 25, 4, {0},&reftables[88], &reftables[89]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension", 7, &msgs[9], (const upb_def*)(&msgs[7]), 20, 3, {0},&reftables[90], &reftables[91]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "extension_range", 5, &msgs[0], (const upb_def*)(&msgs[1]), 22, 3, {0},&reftables[92], &reftables[93]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "field", 2, &msgs[0], (const upb_def*)(&msgs[7]), 13, 0, {0},&reftables[94], &reftables[95]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "file", 1, &msgs[10], (const upb_def*)(&msgs[9]), 6, 0, {0},&reftables[96], &reftables[97]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "go_package", 11, &msgs[11], NULL, 15, 5, {0},&reftables[98], &reftables[99]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "identifier_value", 3, &msgs[20], NULL, 7, 1, {0},&reftables[100], &reftables[101]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "input_type", 2, &msgs[13], NULL, 8, 2, {0},&reftables[102], &reftables[103]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_BOOL, 0, false, false, false, false, "is_extension", 2, &msgs[21], NULL, 6, 1, {0},&reftables[104], &reftables[105]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generate_equals_and_hash", 20, &msgs[11], NULL, 21, 9, {0},&reftables[106], &reftables[107]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_generic_services", 17, &msgs[11], NULL, 19, 7, {0},&reftables[108], &reftables[109]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_multiple_files", 10, &msgs[11], NULL, 14, 4, {0},&reftables[110], &reftables[111]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_outer_classname", 8, &msgs[11], NULL, 10, 2, {0},&reftables[112], &reftables[113]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "java_package", 1, &msgs[11], NULL, 7, 1, {0},&reftables[114], &reftables[115]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "java_string_check_utf8", 27, &msgs[11], NULL, 23, 11, {0},&reftables[116], &reftables[117]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "javanano_use_deprecated_package", 38, &msgs[11], NULL, 31, 15, {0},&reftables[118], &reftables[119]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "json_name", 10, &msgs[7], NULL, 21, 9, {0},&reftables[120], &reftables[121]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "jstype", 6, &msgs[8], (const upb_def*)(&enums[3]), 11, 5, {0},&reftables[122], &reftables[123]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "label", 4, &msgs[7], (const upb_def*)(&enums[0]), 12, 4, {0},&reftables[124], &reftables[125]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "lazy", 5, &msgs[8], NULL, 10, 4, {0},&reftables[126], &reftables[127]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "leading_comments", 3, &msgs[19], NULL, 9, 2, {0},&reftables[128], &reftables[129]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "leading_detached_comments", 6, &msgs[19], NULL, 17, 4, {0},&reftables[130], &reftables[131]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "location", 1, &msgs[18], (const upb_def*)(&msgs[19]), 6, 0, {0},&reftables[132], &reftables[133]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "map_entry", 7, &msgs[12], NULL, 10, 4, {0},&reftables[134], &reftables[135]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "message_set_wire_format", 1, &msgs[12], NULL, 7, 1, {0},&reftables[136], &reftables[137]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "message_type", 4, &msgs[9], (const upb_def*)(&msgs[0]), 11, 0, {0},&reftables[138], &reftables[139]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "method", 2, &msgs[16], (const upb_def*)(&msgs[13]), 7, 0, {0},&reftables[140], &reftables[141]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "name", 2, &msgs[20], (const upb_def*)(&msgs[21]), 6, 0, {0},&reftables[142], &reftables[143]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[5], NULL, 5, 1, {0},&reftables[144], &reftables[145]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[9], NULL, 23, 6, {0},&reftables[146], &reftables[147]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[3], NULL, 9, 2, {0},&reftables[148], &reftables[149]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[16], NULL, 9, 2, {0},&reftables[150], &reftables[151]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[15], NULL, 3, 0, {0},&reftables[152], &reftables[153]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[13], NULL, 5, 1, {0},&reftables[154], &reftables[155]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[7], NULL, 5, 1, {0},&reftables[156], &reftables[157]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "name", 1, &msgs[0], NULL, 33, 8, {0},&reftables[158], &reftables[159]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REQUIRED, UPB_TYPE_STRING, 0, false, false, false, false, "name_part", 1, &msgs[21], NULL, 3, 0, {0},&reftables[160], &reftables[161]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT64, UPB_INTFMT_VARIABLE, false, false, false, false, "negative_int_value", 5, &msgs[20], NULL, 11, 3, {0},&reftables[162], &reftables[163]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "nested_type", 3, &msgs[0], (const upb_def*)(&msgs[0]), 16, 1, {0},&reftables[164], &reftables[165]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "no_standard_descriptor_accessor", 2, &msgs[12], NULL, 8, 2, {0},&reftables[166], &reftables[167]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 3, &msgs[7], NULL, 11, 3, {0},&reftables[168], &reftables[169]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "number", 2, &msgs[5], NULL, 8, 2, {0},&reftables[170], &reftables[171]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "objc_class_prefix", 36, &msgs[11], NULL, 25, 13, {0},&reftables[172], &reftables[173]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "oneof_decl", 8, &msgs[0], (const upb_def*)(&msgs[15]), 29, 6, {0},&reftables[174], &reftables[175]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "oneof_index", 9, &msgs[7], NULL, 20, 8, {0},&reftables[176], &reftables[177]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "optimize_for", 9, &msgs[11], (const upb_def*)(&enums[4]), 13, 3, {0},&reftables[178], &reftables[179]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 7, &msgs[0], (const upb_def*)(&msgs[12]), 26, 5, {0},&reftables[180], &reftables[181]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[9], (const upb_def*)(&msgs[11]), 21, 4, {0},&reftables[182], &reftables[183]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 8, &msgs[7], (const upb_def*)(&msgs[8]), 4, 0, {0},&reftables[184], &reftables[185]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 4, &msgs[13], (const upb_def*)(&msgs[14]), 4, 0, {0},&reftables[186], &reftables[187]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[16], (const upb_def*)(&msgs[17]), 8, 1, {0},&reftables[188], &reftables[189]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[3], (const upb_def*)(&msgs[4]), 8, 1, {0},&reftables[190], &reftables[191]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "options", 3, &msgs[5], (const upb_def*)(&msgs[6]), 4, 0, {0},&reftables[192], &reftables[193]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "output_type", 3, &msgs[13], NULL, 11, 3, {0},&reftables[194], &reftables[195]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "package", 2, &msgs[9], NULL, 26, 7, {0},&reftables[196], &reftables[197]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "packed", 2, &msgs[8], NULL, 8, 2, {0},&reftables[198], &reftables[199]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "path", 1, &msgs[19], NULL, 5, 0, {0},&reftables[200], &reftables[201]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "php_class_prefix", 40, &msgs[11], NULL, 32, 16, {0},&reftables[202], &reftables[203]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "php_namespace", 41, &msgs[11], NULL, 35, 17, {0},&reftables[204], &reftables[205]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_UINT64, UPB_INTFMT_VARIABLE, false, false, false, false, "positive_int_value", 4, &msgs[20], NULL, 10, 2, {0},&reftables[206], &reftables[207]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "public_dependency", 10, &msgs[9], NULL, 36, 9, {0},&reftables[208], &reftables[209]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "py_generic_services", 18, &msgs[11], NULL, 20, 8, {0},&reftables[210], &reftables[211]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_STRING, 0, false, false, false, false, "reserved_name", 10, &msgs[0], NULL, 38, 9, {0},&reftables[212], &reftables[213]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "reserved_range", 9, &msgs[0], (const upb_def*)(&msgs[2]), 32, 7, {0},&reftables[214], &reftables[215]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "server_streaming", 6, &msgs[13], NULL, 15, 5, {0},&reftables[216], &reftables[217]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "service", 6, &msgs[9], (const upb_def*)(&msgs[16]), 17, 2, {0},&reftables[218], &reftables[219]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_MESSAGE, 0, false, false, false, false, "source_code_info", 9, &msgs[9], (const upb_def*)(&msgs[18]), 22, 5, {0},&reftables[220], &reftables[221]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, true, "span", 2, &msgs[19], NULL, 8, 1, {0},&reftables[222], &reftables[223]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[2], NULL, 3, 0, {0},&reftables[224], &reftables[225]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "start", 1, &msgs[1], NULL, 3, 0, {0},&reftables[226], &reftables[227]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BYTES, 0, false, false, false, false, "string_value", 7, &msgs[20], NULL, 13, 5, {0},&reftables[228], &reftables[229]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "syntax", 12, &msgs[9], NULL, 40, 11, {0},&reftables[230], &reftables[231]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "trailing_comments", 4, &msgs[19], NULL, 12, 3, {0},&reftables[232], &reftables[233]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_ENUM, 0, false, false, false, false, "type", 5, &msgs[7], (const upb_def*)(&enums[1]), 13, 5, {0},&reftables[234], &reftables[235]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_STRING, 0, false, false, false, false, "type_name", 6, &msgs[7], NULL, 14, 6, {0},&reftables[236], &reftables[237]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[12], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[238], &reftables[239]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[17], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[240], &reftables[241]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[11], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[242], &reftables[243]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[14], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[244], &reftables[245]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[8], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[246], &reftables[247]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[6], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[248], &reftables[249]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "uninterpreted_option", 999, &msgs[4], (const upb_def*)(&msgs[20]), 6, 0, {0},&reftables[250], &reftables[251]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_MESSAGE, 0, false, false, false, false, "value", 2, &msgs[3], (const upb_def*)(&msgs[5]), 7, 0, {0},&reftables[252], &reftables[253]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_OPTIONAL, UPB_TYPE_BOOL, 0, false, false, false, false, "weak", 10, &msgs[8], NULL, 12, 6, {0},&reftables[254], &reftables[255]),
+  UPB_FIELDDEF_INIT(UPB_LABEL_REPEATED, UPB_TYPE_INT32, UPB_INTFMT_VARIABLE, false, false, false, false, "weak_dependency", 11, &msgs[9], NULL, 39, 10, {0},&reftables[256], &reftables[257]),
 };
 
 static const upb_enumdef enums[5] = {
-  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Label", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[188]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[151], 4, 3), 0, &reftables[254], &reftables[255]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Type", UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_INT32, 5, &strentries[192]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[155], 19, 18), 0, &reftables[256], &reftables[257]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.CType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[224]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[174], 3, 3), 0, &reftables[258], &reftables[259]),
-  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.JSType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[228]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[177], 3, 3), 0, &reftables[260], &reftables[261]),
-  UPB_ENUMDEF_INIT("google.protobuf.FileOptions.OptimizeMode", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[232]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[180], 4, 3), 0, &reftables[262], &reftables[263]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Label", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[188]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[154], 4, 3), 0, &reftables[258], &reftables[259]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldDescriptorProto.Type", UPB_STRTABLE_INIT(18, 31, UPB_CTYPE_INT32, 5, &strentries[192]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[158], 19, 18), 0, &reftables[260], &reftables[261]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.CType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[224]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[177], 3, 3), 0, &reftables[262], &reftables[263]),
+  UPB_ENUMDEF_INIT("google.protobuf.FieldOptions.JSType", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[228]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[180], 3, 3), 0, &reftables[264], &reftables[265]),
+  UPB_ENUMDEF_INIT("google.protobuf.FileOptions.OptimizeMode", UPB_STRTABLE_INIT(3, 3, UPB_CTYPE_INT32, 2, &strentries[232]), UPB_INTTABLE_INIT(0, 0, UPB_CTYPE_CSTR, 0, NULL, &arrays[183], 4, 3), 0, &reftables[266], &reftables[267]),
 };
 
 static const upb_tabent strentries[236] = {
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "extension"), UPB_TABVALUE_PTR_INIT(&fields[22]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "reserved_name"), UPB_TABVALUE_PTR_INIT(&fields[82]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[52]), NULL},
+  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "reserved_name"), UPB_TABVALUE_PTR_INIT(&fields[84]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[57]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6709,53 +7561,53 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "nested_type"), UPB_TABVALUE_PTR_INIT(&fields[60]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\016", "\000", "\000", "\000", "reserved_range"), UPB_TABVALUE_PTR_INIT(&fields[83]), NULL},
+  {UPB_TABKEY_STR("\016", "\000", "\000", "\000", "reserved_range"), UPB_TABVALUE_PTR_INIT(&fields[85]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[68]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "oneof_decl"), UPB_TABVALUE_PTR_INIT(&fields[65]), NULL},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[19]), &strentries[13]},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[89]), NULL},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[20]), &strentries[13]},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[91]), NULL},
   {UPB_TABKEY_STR("\003", "\000", "\000", "\000", "end"), UPB_TABVALUE_PTR_INIT(&fields[18]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[88]), NULL},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "start"), UPB_TABVALUE_PTR_INIT(&fields[90]), NULL},
   {UPB_TABKEY_STR("\003", "\000", "\000", "\000", "end"), UPB_TABVALUE_PTR_INIT(&fields[17]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "value"), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[74]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[49]), &strentries[26]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[13]), NULL},
+  {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "value"), UPB_TABVALUE_PTR_INIT(&fields[104]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[73]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[52]), &strentries[26]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "allow_alias"), UPB_TABVALUE_PTR_INIT(&fields[1]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[62]), NULL},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[63]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[73]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[53]), &strentries[34]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[74]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[50]), &strentries[34]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[13]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "oneof_index"), UPB_TABVALUE_PTR_INIT(&fields[66]), NULL},
   {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "label"), UPB_TABVALUE_PTR_INIT(&fields[40]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[55]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[56]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[63]), &strentries[53]},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "number"), UPB_TABVALUE_PTR_INIT(&fields[62]), &strentries[53]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\010", "\000", "\000", "\000", "extendee"), UPB_TABVALUE_PTR_INIT(&fields[21]), NULL},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "type_name"), UPB_TABVALUE_PTR_INIT(&fields[94]), NULL},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "type_name"), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "json_name"), UPB_TABVALUE_PTR_INIT(&fields[38]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "type"), UPB_TABVALUE_PTR_INIT(&fields[93]), &strentries[50]},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "type"), UPB_TABVALUE_PTR_INIT(&fields[95]), &strentries[50]},
   {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "default_value"), UPB_TABVALUE_PTR_INIT(&fields[7]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[71]), NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[70]), NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "weak"), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "weak"), UPB_TABVALUE_PTR_INIT(&fields[105]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6766,25 +7618,25 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_STR("\005", "\000", "\000", "\000", "ctype"), UPB_TABVALUE_PTR_INIT(&fields[6]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "jstype"), UPB_TABVALUE_PTR_INIT(&fields[39]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[9]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "extension"), UPB_TABVALUE_PTR_INIT(&fields[23]), NULL},
-  {UPB_TABKEY_STR("\017", "\000", "\000", "\000", "weak_dependency"), UPB_TABVALUE_PTR_INIT(&fields[104]), NULL},
+  {UPB_TABKEY_STR("\017", "\000", "\000", "\000", "weak_dependency"), UPB_TABVALUE_PTR_INIT(&fields[106]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[54]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "service"), UPB_TABVALUE_PTR_INIT(&fields[85]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[51]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "service"), UPB_TABVALUE_PTR_INIT(&fields[87]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "source_code_info"), UPB_TABVALUE_PTR_INIT(&fields[86]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "source_code_info"), UPB_TABVALUE_PTR_INIT(&fields[88]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "syntax"), UPB_TABVALUE_PTR_INIT(&fields[91]), NULL},
+  {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "syntax"), UPB_TABVALUE_PTR_INIT(&fields[93]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "dependency"), UPB_TABVALUE_PTR_INIT(&fields[8]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "message_type"), UPB_TABVALUE_PTR_INIT(&fields[47]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "package"), UPB_TABVALUE_PTR_INIT(&fields[76]), NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[69]), &strentries[86]},
-  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[20]), NULL},
-  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "public_dependency"), UPB_TABVALUE_PTR_INIT(&fields[80]), &strentries[85]},
+  {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "enum_type"), UPB_TABVALUE_PTR_INIT(&fields[19]), NULL},
+  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "public_dependency"), UPB_TABVALUE_PTR_INIT(&fields[82]), &strentries[85]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "file"), UPB_TABVALUE_PTR_INIT(&fields[26]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6792,7 +7644,7 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "cc_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[3]), NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "csharp_namespace"), UPB_TABVALUE_PTR_INIT(&fields[5]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "csharp_namespace"), UPB_TABVALUE_PTR_INIT(&fields[5]), &strentries[116]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6805,17 +7657,17 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "java_outer_classname"), UPB_TABVALUE_PTR_INIT(&fields[34]), NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[95]), NULL},
+  {UPB_TABKEY_STR("\015", "\000", "\000", "\000", "php_namespace"), UPB_TABVALUE_PTR_INIT(&fields[80]), &strentries[113]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "java_multiple_files"), UPB_TABVALUE_PTR_INIT(&fields[33]), &strentries[117]},
-  {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
   {UPB_TABKEY_STR("\025", "\000", "\000", "\000", "java_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[32]), &strentries[118]},
   {UPB_TABKEY_STR("\035", "\000", "\000", "\000", "java_generate_equals_and_hash"), UPB_TABVALUE_PTR_INIT(&fields[31]), NULL},
-  {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "php_class_prefix"), UPB_TABVALUE_PTR_INIT(&fields[79]), NULL},
   {UPB_TABKEY_STR("\037", "\000", "\000", "\000", "javanano_use_deprecated_package"), UPB_TABVALUE_PTR_INIT(&fields[37]), &strentries[123]},
-  {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "py_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[81]), NULL},
+  {UPB_TABKEY_STR("\023", "\000", "\000", "\000", "py_generic_services"), UPB_TABVALUE_PTR_INIT(&fields[83]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "optimize_for"), UPB_TABVALUE_PTR_INIT(&fields[67]), NULL},
   {UPB_TABKEY_STR("\026", "\000", "\000", "\000", "java_string_check_utf8"), UPB_TABVALUE_PTR_INIT(&fields[36]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[12]), &strentries[119]},
@@ -6825,32 +7677,32 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[9]), NULL},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
   {UPB_TABKEY_STR("\011", "\000", "\000", "\000", "map_entry"), UPB_TABVALUE_PTR_INIT(&fields[45]), NULL},
   {UPB_TABKEY_STR("\037", "\000", "\000", "\000", "no_standard_descriptor_accessor"), UPB_TABVALUE_PTR_INIT(&fields[61]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "client_streaming"), UPB_TABVALUE_PTR_INIT(&fields[4]), NULL},
-  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "server_streaming"), UPB_TABVALUE_PTR_INIT(&fields[84]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[56]), NULL},
+  {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "server_streaming"), UPB_TABVALUE_PTR_INIT(&fields[86]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[55]), NULL},
   {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "input_type"), UPB_TABVALUE_PTR_INIT(&fields[29]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\013", "\000", "\000", "\000", "output_type"), UPB_TABVALUE_PTR_INIT(&fields[75]), NULL},
-  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[70]), NULL},
+  {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[71]), NULL},
   {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[100]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[50]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[54]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\007", "\000", "\000", "\000", "options"), UPB_TABVALUE_PTR_INIT(&fields[72]), &strentries[150]},
   {UPB_TABKEY_STR("\006", "\000", "\000", "\000", "method"), UPB_TABVALUE_PTR_INIT(&fields[48]), NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[57]), &strentries[149]},
-  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
-  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[53]), &strentries[149]},
+  {UPB_TABKEY_STR("\024", "\000", "\000", "\000", "uninterpreted_option"), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
+  {UPB_TABKEY_STR("\012", "\000", "\000", "\000", "deprecated"), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6860,15 +7712,15 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "span"), UPB_TABVALUE_PTR_INIT(&fields[87]), &strentries[167]},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "span"), UPB_TABVALUE_PTR_INIT(&fields[89]), &strentries[167]},
   {UPB_TABKEY_STR("\031", "\000", "\000", "\000", "leading_detached_comments"), UPB_TABVALUE_PTR_INIT(&fields[43]), &strentries[165]},
-  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "trailing_comments"), UPB_TABVALUE_PTR_INIT(&fields[92]), NULL},
+  {UPB_TABKEY_STR("\021", "\000", "\000", "\000", "trailing_comments"), UPB_TABVALUE_PTR_INIT(&fields[94]), NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "leading_comments"), UPB_TABVALUE_PTR_INIT(&fields[42]), &strentries[164]},
   {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "path"), UPB_TABVALUE_PTR_INIT(&fields[78]), NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "double_value"), UPB_TABVALUE_PTR_INIT(&fields[16]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[51]), NULL},
+  {UPB_TABKEY_STR("\004", "\000", "\000", "\000", "name"), UPB_TABVALUE_PTR_INIT(&fields[49]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
@@ -6878,9 +7730,9 @@ static const upb_tabent strentries[236] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_STR("\022", "\000", "\000", "\000", "positive_int_value"), UPB_TABVALUE_PTR_INIT(&fields[79]), NULL},
+  {UPB_TABKEY_STR("\022", "\000", "\000", "\000", "positive_int_value"), UPB_TABVALUE_PTR_INIT(&fields[81]), NULL},
   {UPB_TABKEY_STR("\020", "\000", "\000", "\000", "identifier_value"), UPB_TABVALUE_PTR_INIT(&fields[28]), NULL},
-  {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "string_value"), UPB_TABVALUE_PTR_INIT(&fields[90]), &strentries[182]},
+  {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "string_value"), UPB_TABVALUE_PTR_INIT(&fields[92]), &strentries[182]},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_STR("\014", "\000", "\000", "\000", "is_extension"), UPB_TABVALUE_PTR_INIT(&fields[30]), NULL},
@@ -6937,92 +7789,92 @@ static const upb_tabent strentries[236] = {
 
 static const upb_tabent intentries[18] = {
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[103]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[102]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[95]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[99]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[96]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[97]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[11]), NULL},
+  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[10]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
   {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[100]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[14]), NULL},
+  {UPB_TABKEY_NUM(33), UPB_TABVALUE_PTR_INIT(&fields[15]), NULL},
   {UPB_TABKEY_NONE, UPB_TABVALUE_EMPTY_INIT, NULL},
-  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[101]), NULL},
+  {UPB_TABKEY_NUM(999), UPB_TABVALUE_PTR_INIT(&fields[98]), NULL},
 };
 
-static const upb_tabval arrays[184] = {
+static const upb_tabval arrays[187] = {
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[52]),
+  UPB_TABVALUE_PTR_INIT(&fields[57]),
   UPB_TABVALUE_PTR_INIT(&fields[25]),
   UPB_TABVALUE_PTR_INIT(&fields[60]),
-  UPB_TABVALUE_PTR_INIT(&fields[19]),
+  UPB_TABVALUE_PTR_INIT(&fields[20]),
   UPB_TABVALUE_PTR_INIT(&fields[24]),
   UPB_TABVALUE_PTR_INIT(&fields[22]),
   UPB_TABVALUE_PTR_INIT(&fields[68]),
   UPB_TABVALUE_PTR_INIT(&fields[65]),
-  UPB_TABVALUE_PTR_INIT(&fields[83]),
-  UPB_TABVALUE_PTR_INIT(&fields[82]),
+  UPB_TABVALUE_PTR_INIT(&fields[85]),
+  UPB_TABVALUE_PTR_INIT(&fields[84]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[89]),
+  UPB_TABVALUE_PTR_INIT(&fields[91]),
   UPB_TABVALUE_PTR_INIT(&fields[18]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[88]),
+  UPB_TABVALUE_PTR_INIT(&fields[90]),
   UPB_TABVALUE_PTR_INIT(&fields[17]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[49]),
-  UPB_TABVALUE_PTR_INIT(&fields[102]),
-  UPB_TABVALUE_PTR_INIT(&fields[74]),
+  UPB_TABVALUE_PTR_INIT(&fields[52]),
+  UPB_TABVALUE_PTR_INIT(&fields[104]),
+  UPB_TABVALUE_PTR_INIT(&fields[73]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[1]),
-  UPB_TABVALUE_PTR_INIT(&fields[13]),
+  UPB_TABVALUE_PTR_INIT(&fields[14]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[53]),
-  UPB_TABVALUE_PTR_INIT(&fields[62]),
-  UPB_TABVALUE_PTR_INIT(&fields[73]),
+  UPB_TABVALUE_PTR_INIT(&fields[50]),
+  UPB_TABVALUE_PTR_INIT(&fields[63]),
+  UPB_TABVALUE_PTR_INIT(&fields[74]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[15]),
+  UPB_TABVALUE_PTR_INIT(&fields[13]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[55]),
+  UPB_TABVALUE_PTR_INIT(&fields[56]),
   UPB_TABVALUE_PTR_INIT(&fields[21]),
-  UPB_TABVALUE_PTR_INIT(&fields[63]),
+  UPB_TABVALUE_PTR_INIT(&fields[62]),
   UPB_TABVALUE_PTR_INIT(&fields[40]),
-  UPB_TABVALUE_PTR_INIT(&fields[93]),
-  UPB_TABVALUE_PTR_INIT(&fields[94]),
+  UPB_TABVALUE_PTR_INIT(&fields[95]),
+  UPB_TABVALUE_PTR_INIT(&fields[96]),
   UPB_TABVALUE_PTR_INIT(&fields[7]),
-  UPB_TABVALUE_PTR_INIT(&fields[71]),
+  UPB_TABVALUE_PTR_INIT(&fields[70]),
   UPB_TABVALUE_PTR_INIT(&fields[66]),
   UPB_TABVALUE_PTR_INIT(&fields[38]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[6]),
   UPB_TABVALUE_PTR_INIT(&fields[77]),
-  UPB_TABVALUE_PTR_INIT(&fields[10]),
+  UPB_TABVALUE_PTR_INIT(&fields[9]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[41]),
   UPB_TABVALUE_PTR_INIT(&fields[39]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[103]),
+  UPB_TABVALUE_PTR_INIT(&fields[105]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[54]),
+  UPB_TABVALUE_PTR_INIT(&fields[51]),
   UPB_TABVALUE_PTR_INIT(&fields[76]),
   UPB_TABVALUE_PTR_INIT(&fields[8]),
   UPB_TABVALUE_PTR_INIT(&fields[47]),
-  UPB_TABVALUE_PTR_INIT(&fields[20]),
-  UPB_TABVALUE_PTR_INIT(&fields[85]),
+  UPB_TABVALUE_PTR_INIT(&fields[19]),
+  UPB_TABVALUE_PTR_INIT(&fields[87]),
   UPB_TABVALUE_PTR_INIT(&fields[23]),
   UPB_TABVALUE_PTR_INIT(&fields[69]),
-  UPB_TABVALUE_PTR_INIT(&fields[86]),
-  UPB_TABVALUE_PTR_INIT(&fields[80]),
-  UPB_TABVALUE_PTR_INIT(&fields[104]),
-  UPB_TABVALUE_PTR_INIT(&fields[91]),
+  UPB_TABVALUE_PTR_INIT(&fields[88]),
+  UPB_TABVALUE_PTR_INIT(&fields[82]),
+  UPB_TABVALUE_PTR_INIT(&fields[106]),
+  UPB_TABVALUE_PTR_INIT(&fields[93]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[26]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7043,7 +7895,7 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[3]),
   UPB_TABVALUE_PTR_INIT(&fields[32]),
-  UPB_TABVALUE_PTR_INIT(&fields[81]),
+  UPB_TABVALUE_PTR_INIT(&fields[83]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[31]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7065,25 +7917,28 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_PTR_INIT(&fields[5]),
   UPB_TABVALUE_PTR_INIT(&fields[37]),
   UPB_TABVALUE_EMPTY_INIT,
+  UPB_TABVALUE_PTR_INIT(&fields[79]),
+  UPB_TABVALUE_PTR_INIT(&fields[80]),
+  UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[46]),
   UPB_TABVALUE_PTR_INIT(&fields[61]),
-  UPB_TABVALUE_PTR_INIT(&fields[9]),
+  UPB_TABVALUE_PTR_INIT(&fields[11]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[45]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[56]),
+  UPB_TABVALUE_PTR_INIT(&fields[55]),
   UPB_TABVALUE_PTR_INIT(&fields[29]),
   UPB_TABVALUE_PTR_INIT(&fields[75]),
-  UPB_TABVALUE_PTR_INIT(&fields[70]),
+  UPB_TABVALUE_PTR_INIT(&fields[71]),
   UPB_TABVALUE_PTR_INIT(&fields[4]),
-  UPB_TABVALUE_PTR_INIT(&fields[84]),
+  UPB_TABVALUE_PTR_INIT(&fields[86]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[50]),
+  UPB_TABVALUE_PTR_INIT(&fields[54]),
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[57]),
+  UPB_TABVALUE_PTR_INIT(&fields[53]),
   UPB_TABVALUE_PTR_INIT(&fields[48]),
   UPB_TABVALUE_PTR_INIT(&fields[72]),
   UPB_TABVALUE_EMPTY_INIT,
@@ -7091,19 +7946,19 @@ static const upb_tabval arrays[184] = {
   UPB_TABVALUE_PTR_INIT(&fields[44]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[78]),
-  UPB_TABVALUE_PTR_INIT(&fields[87]),
+  UPB_TABVALUE_PTR_INIT(&fields[89]),
   UPB_TABVALUE_PTR_INIT(&fields[42]),
-  UPB_TABVALUE_PTR_INIT(&fields[92]),
+  UPB_TABVALUE_PTR_INIT(&fields[94]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[43]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_EMPTY_INIT,
-  UPB_TABVALUE_PTR_INIT(&fields[51]),
+  UPB_TABVALUE_PTR_INIT(&fields[49]),
   UPB_TABVALUE_PTR_INIT(&fields[28]),
-  UPB_TABVALUE_PTR_INIT(&fields[79]),
+  UPB_TABVALUE_PTR_INIT(&fields[81]),
   UPB_TABVALUE_PTR_INIT(&fields[59]),
   UPB_TABVALUE_PTR_INIT(&fields[16]),
-  UPB_TABVALUE_PTR_INIT(&fields[90]),
+  UPB_TABVALUE_PTR_INIT(&fields[92]),
   UPB_TABVALUE_PTR_INIT(&fields[0]),
   UPB_TABVALUE_EMPTY_INIT,
   UPB_TABVALUE_PTR_INIT(&fields[58]),
@@ -7144,7 +7999,11 @@ static const upb_tabval arrays[184] = {
 };
 
 #ifdef UPB_DEBUG_REFS
-static upb_inttable reftables[264] = {
+static upb_inttable reftables[268] = {
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
+  UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
   UPB_EMPTY_INTTABLE_INIT(UPB_CTYPE_PTR),
@@ -7497,6 +8356,7 @@ typedef struct {
 struct upb_descreader {
   upb_sink sink;
   upb_inttable files;
+  upb_strtable files_by_name;
   upb_filedef *file;  /* The last file in files. */
   upb_descreader_frame stack[UPB_MAX_MESSAGE_NESTING];
   int stack_len;
@@ -7663,6 +8523,7 @@ static size_t file_onname(void *closure, const void *hd, const char *buf,
   UPB_UNUSED(handle);
 
   name = upb_gstrndup(buf, n);
+  upb_strtable_insert(&r->files_by_name, name, upb_value_ptr(r->file));
   /* XXX: see comment at the top of the file. */
   ok = upb_filedef_setname(r->file, name, NULL);
   upb_gfree(name);
@@ -7686,6 +8547,49 @@ static size_t file_onpackage(void *closure, const void *hd, const char *buf,
   return n;
 }
 
+static void *file_startphpnamespace(void *closure, const void *hd,
+                                    size_t size_hint) {
+  upb_descreader *r = closure;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(size_hint);
+
+  ok = upb_filedef_setphpnamespace(r->file, "", NULL);
+  UPB_ASSERT(ok);
+  return closure;
+}
+
+static size_t file_onphpnamespace(void *closure, const void *hd,
+                                  const char *buf, size_t n,
+                                  const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  char *php_namespace;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+
+  php_namespace = upb_gstrndup(buf, n);
+  ok = upb_filedef_setphpnamespace(r->file, php_namespace, NULL);
+  upb_gfree(php_namespace);
+  UPB_ASSERT(ok);
+  return n;
+}
+
+static size_t file_onphpprefix(void *closure, const void *hd, const char *buf,
+                             size_t n, const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  char *prefix;
+  bool ok;
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+
+  prefix = upb_gstrndup(buf, n);
+  ok = upb_filedef_setphpprefix(r->file, prefix, NULL);
+  upb_gfree(prefix);
+  UPB_ASSERT(ok);
+  return n;
+}
+
 static size_t file_onsyntax(void *closure, const void *hd, const char *buf,
                             size_t n, const upb_bufhandle *handle) {
   upb_descreader *r = closure;
@@ -7733,6 +8637,18 @@ static void *file_startext(void *closure, const void *hd) {
   return r;
 }
 
+static size_t file_ondep(void *closure, const void *hd, const char *buf,
+                         size_t n, const upb_bufhandle *handle) {
+  upb_descreader *r = closure;
+  upb_value val;
+  if (upb_strtable_lookup2(&r->files_by_name, buf, n, &val)) {
+    upb_filedef_adddep(r->file, upb_value_getptr(val));
+  }
+  UPB_UNUSED(hd);
+  UPB_UNUSED(handle);
+  return n;
+}
+
 /** Handlers for google.protobuf.EnumValueDescriptorProto. *********************/
 
 static bool enumval_startmsg(void *closure, const void *hd) {
@@ -8177,6 +9093,8 @@ static void reghandlers(const void *closure, upb_handlers *h) {
                                 &file_startenum, NULL);
     upb_handlers_setstartsubmsg(h, F(FileDescriptorProto, extension),
                                 &file_startext, NULL);
+    upb_handlers_setstring(h, F(FileDescriptorProto, dependency),
+                           &file_ondep, NULL);
   } else if (upbdefs_google_protobuf_EnumValueDescriptorProto_is(m)) {
     upb_handlers_setstartmsg(h, &enumval_startmsg, NULL);
     upb_handlers_setendmsg(h, &enumval_endmsg, NULL);
@@ -8212,6 +9130,13 @@ static void reghandlers(const void *closure, upb_handlers *h) {
     upb_handlers_setbool(h, F(FieldOptions, packed), &field_onpacked, NULL);
   } else if (upbdefs_google_protobuf_MessageOptions_is(m)) {
     upb_handlers_setbool(h, F(MessageOptions, map_entry), &msg_onmapentry, NULL);
+  } else if (upbdefs_google_protobuf_FileOptions_is(m)) {
+    upb_handlers_setstring(h, F(FileOptions, php_class_prefix),
+                           &file_onphpprefix, NULL);
+    upb_handlers_setstartstr(h, F(FileOptions, php_namespace),
+                             &file_startphpnamespace, NULL);
+    upb_handlers_setstring(h, F(FileOptions, php_namespace),
+                           &file_onphpnamespace, NULL);
   }
 
   UPB_ASSERT(upb_ok(upb_handlers_status(h)));
@@ -8229,6 +9154,7 @@ void descreader_cleanup(void *_r) {
 
   upb_gfree(r->name);
   upb_inttable_uninit(&r->files);
+  upb_strtable_uninit(&r->files_by_name);
   upb_inttable_uninit(&r->oneofs);
   upb_gfree(r->default_string);
   while (r->stack_len > 0) {
@@ -8247,6 +9173,7 @@ upb_descreader *upb_descreader_create(upb_env *e, const upb_handlers *h) {
   }
 
   upb_inttable_init(&r->files, UPB_CTYPE_PTR);
+  upb_strtable_init(&r->files_by_name, UPB_CTYPE_PTR);
   upb_inttable_init(&r->oneofs, UPB_CTYPE_PTR);
   upb_sink_reset(upb_descreader_input(r), h, r);
   r->stack_len = 0;
@@ -8546,7 +9473,7 @@ static void put32(compiler *c, uint32_t v) {
   *c->pc++ = v;
 }
 
-static void putop(compiler *c, opcode op, ...) {
+static void putop(compiler *c, int op, ...) {
   va_list ap;
   va_start(ap, op);
 
@@ -9829,7 +10756,6 @@ have_tag:
       return upb_pbdecoder_suspend(d);
     }
 
-    /* TODO: deliver to unknown field callback. */
     switch (wire_type) {
       case UPB_WIRE_TYPE_32BIT:
         CHECK_RETURN(skip(d, 4));
@@ -9867,6 +10793,8 @@ have_tag:
     }
 
     if (d->top->groupnum >= 0) {
+      /* TODO: More code needed for handling unknown groups. */
+      upb_sink_putunknown(&d->top->sink, d->checkpoint, d->ptr - d->checkpoint);
       return DECODE_OK;
     }
 
@@ -10722,6 +11650,12 @@ static void *encode_startdelimfield(void *c, const void *hd) {
   return ok ? c : UPB_BREAK;
 }
 
+static bool encode_unknown(void *c, const void *hd, const char *buf,
+                           size_t len) {
+  UPB_UNUSED(hd);
+  return encode_bytes(c, buf, len) && commit(c);
+}
+
 static bool encode_enddelimfield(void *c, const void *hd) {
   UPB_UNUSED(hd);
   return end_delim(c);
@@ -10759,7 +11693,7 @@ static size_t encode_strbuf(void *c, const void *hd, const char *buf,
 T(double,   double,   dbl2uint64,   encode_fixed64)
 T(float,    float,    flt2uint32,   encode_fixed32)
 T(int64,    int64_t,  uint64_t,     encode_varint)
-T(int32,    int32_t,  uint32_t,     encode_varint)
+T(int32,    int32_t,  int64_t,      encode_varint)
 T(fixed64,  uint64_t, uint64_t,     encode_fixed64)
 T(fixed32,  uint32_t, uint32_t,     encode_fixed32)
 T(bool,     bool,     bool,         encode_varint)
@@ -10784,6 +11718,7 @@ static void newhandlers_callback(const void *closure, upb_handlers *h) {
 
   upb_handlers_setstartmsg(h, startmsg, NULL);
   upb_handlers_setendmsg(h, endmsg, NULL);
+  upb_handlers_setunknown(h, encode_unknown, NULL);
 
   m = upb_handlers_msgdef(h);
   for(upb_msg_field_begin(&i, m);
@@ -11374,57 +12309,6 @@ done:
   return r;
 }
 
-/* Given an encoded varint v, returns an integer with a single bit set that
- * indicates the end of the varint.  Subtracting one from this value will
- * yield a mask that leaves only bits that are part of the varint.  Returns
- * 0 if the varint is unterminated. */
-static uint64_t upb_get_vstopbit(uint64_t v) {
-  uint64_t cbits = v | 0x7f7f7f7f7f7f7f7fULL;
-  return ~cbits & (cbits+1);
-}
-
-/* A branchless decoder.  Credit to Pascal Massimino for the bit-twiddling. */
-upb_decoderet upb_vdecode_max8_massimino(upb_decoderet r) {
-  uint64_t b;
-  uint64_t stop_bit;
-  upb_decoderet my_r;
-  memcpy(&b, r.p, sizeof(b));
-  stop_bit = upb_get_vstopbit(b);
-  b =  (b & 0x7f7f7f7f7f7f7f7fULL) & (stop_bit - 1);
-  b +=       b & 0x007f007f007f007fULL;
-  b +=  3 * (b & 0x0000ffff0000ffffULL);
-  b += 15 * (b & 0x00000000ffffffffULL);
-  if (stop_bit == 0) {
-    /* Error: unterminated varint. */
-    upb_decoderet err_r = {(void*)0, 0};
-    return err_r;
-  }
-  my_r = upb_decoderet_make(r.p + ((__builtin_ctzll(stop_bit) + 1) / 8),
-                            r.val | (b << 7));
-  return my_r;
-}
-
-/* A branchless decoder.  Credit to Daniel Wright for the bit-twiddling. */
-upb_decoderet upb_vdecode_max8_wright(upb_decoderet r) {
-  uint64_t b;
-  uint64_t stop_bit;
-  upb_decoderet my_r;
-  memcpy(&b, r.p, sizeof(b));
-  stop_bit = upb_get_vstopbit(b);
-  b &= (stop_bit - 1);
-  b = ((b & 0x7f007f007f007f00ULL) >> 1) | (b & 0x007f007f007f007fULL);
-  b = ((b & 0xffff0000ffff0000ULL) >> 2) | (b & 0x0000ffff0000ffffULL);
-  b = ((b & 0xffffffff00000000ULL) >> 4) | (b & 0x00000000ffffffffULL);
-  if (stop_bit == 0) {
-    /* Error: unterminated varint. */
-    upb_decoderet err_r = {(void*)0, 0};
-    return err_r;
-  }
-  my_r = upb_decoderet_make(r.p + ((__builtin_ctzll(stop_bit) + 1) / 8),
-                            r.val | (b << 14));
-  return my_r;
-}
-
 #line 1 "upb/json/parser.rl"
 /*
 ** upb::json::Parser (upb_json_parser)
@@ -11447,8 +12331,9 @@ upb_decoderet upb_vdecode_max8_wright(upb_decoderet r) {
 ** - handling of keys/escape-sequences/etc that span input buffers.
 */
 
-#include <assert.h>
 #include <errno.h>
+#include <float.h>
+#include <math.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12033,103 +12918,160 @@ static void start_number(upb_json_parser *p, const char *ptr) {
   capture_begin(p, ptr);
 }
 
-static bool parse_number(upb_json_parser *p);
+static bool parse_number(upb_json_parser *p, bool is_quoted);
 
 static bool end_number(upb_json_parser *p, const char *ptr) {
   if (!capture_end(p, ptr)) {
     return false;
   }
 
-  return parse_number(p);
+  return parse_number(p, false);
 }
 
-static bool parse_number(upb_json_parser *p) {
-  size_t len;
-  const char *buf;
-  const char *myend;
+/* |buf| is NULL-terminated. |buf| itself will never include quotes;
+ * |is_quoted| tells us whether this text originally appeared inside quotes. */
+static bool parse_number_from_buffer(upb_json_parser *p, const char *buf,
+                                     bool is_quoted) {
+  size_t len = strlen(buf);
+  const char *bufend = buf + len;
   char *end;
+  upb_fieldtype_t type = upb_fielddef_type(p->top->f);
+  double val;
+  double dummy;
+  double inf = 1.0 / 0.0;  /* C89 does not have an INFINITY macro. */
 
-  /* strtol() and friends unfortunately do not support specifying the length of
-   * the input string, so we need to force a copy into a NULL-terminated buffer. */
-  if (!multipart_text(p, "\0", 1, false)) {
+  errno = 0;
+
+  if (len == 0 || buf[0] == ' ') {
     return false;
   }
 
-  buf = accumulate_getptr(p, &len);
-  myend = buf + len - 1;  /* One for NULL. */
-
-  /* XXX: We are using strtol to parse integers, but this is wrong as even
-   * integers can be represented as 1e6 (for example), which strtol can't
-   * handle correctly.
-   *
-   * XXX: Also, we can't handle large integers properly because strto[u]ll
-   * isn't in C89.
-   *
-   * XXX: Also, we don't properly check floats for overflow, since strtof
-   * isn't in C89. */
-  switch (upb_fielddef_type(p->top->f)) {
+  /* For integer types, first try parsing with integer-specific routines.
+   * If these succeed, they will be more accurate for int64/uint64 than
+   * strtod().
+   */
+  switch (type) {
     case UPB_TYPE_ENUM:
     case UPB_TYPE_INT32: {
-      long val = strtol(p->accumulated, &end, 0);
-      if (val > INT32_MAX || val < INT32_MIN || errno == ERANGE || end != myend)
-        goto err;
-      else
+      long val = strtol(buf, &end, 0);
+      if (errno == ERANGE || end != bufend) {
+        break;
+      } else if (val > INT32_MAX || val < INT32_MIN) {
+        return false;
+      } else {
         upb_sink_putint32(&p->top->sink, parser_getsel(p), val);
-      break;
-    }
-    case UPB_TYPE_INT64: {
-      long long val = strtol(p->accumulated, &end, 0);
-      if (val > INT64_MAX || val < INT64_MIN || errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putint64(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
     }
     case UPB_TYPE_UINT32: {
-      unsigned long val = strtoul(p->accumulated, &end, 0);
-      if (val > UINT32_MAX || errno == ERANGE || end != myend)
-        goto err;
-      else
+      unsigned long val = strtoul(buf, &end, 0);
+      if (end != bufend) {
+        break;
+      } else if (val > UINT32_MAX || errno == ERANGE) {
+        return false;
+      } else {
         upb_sink_putuint32(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
+    }
+    /* XXX: We can't handle [u]int64 properly on 32-bit machines because
+     * strto[u]ll isn't in C89. */
+    case UPB_TYPE_INT64: {
+      long val = strtol(buf, &end, 0);
+      if (errno == ERANGE || end != bufend) {
+        break;
+      } else {
+        upb_sink_putint64(&p->top->sink, parser_getsel(p), val);
+        return true;
+      }
     }
     case UPB_TYPE_UINT64: {
-      unsigned long long val = strtoul(p->accumulated, &end, 0);
-      if (val > UINT64_MAX || errno == ERANGE || end != myend)
-        goto err;
-      else
+      unsigned long val = strtoul(p->accumulated, &end, 0);
+      if (end != bufend) {
+        break;
+      } else if (errno == ERANGE) {
+        return false;
+      } else {
         upb_sink_putuint64(&p->top->sink, parser_getsel(p), val);
-      break;
+        return true;
+      }
     }
-    case UPB_TYPE_DOUBLE: {
-      double val = strtod(p->accumulated, &end);
-      if (errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putdouble(&p->top->sink, parser_getsel(p), val);
+    default:
       break;
+  }
+
+  if (type != UPB_TYPE_DOUBLE && type != UPB_TYPE_FLOAT && is_quoted) {
+    /* Quoted numbers for integer types are not allowed to be in double form. */
+    return false;
+  }
+
+  if (len == strlen("Infinity") && strcmp(buf, "Infinity") == 0) {
+    /* C89 does not have an INFINITY macro. */
+    val = inf;
+  } else if (len == strlen("-Infinity") && strcmp(buf, "-Infinity") == 0) {
+    val = -inf;
+  } else {
+    val = strtod(buf, &end);
+    if (errno == ERANGE || end != bufend) {
+      return false;
     }
-    case UPB_TYPE_FLOAT: {
-      float val = strtod(p->accumulated, &end);
-      if (errno == ERANGE || end != myend)
-        goto err;
-      else
-        upb_sink_putfloat(&p->top->sink, parser_getsel(p), val);
-      break;
+  }
+
+  switch (type) {
+#define CASE(capitaltype, smalltype, ctype, min, max)                     \
+    case UPB_TYPE_ ## capitaltype: {                                      \
+      if (modf(val, &dummy) != 0 || val > max || val < min) {             \
+        return false;                                                     \
+      } else {                                                            \
+        upb_sink_put ## smalltype(&p->top->sink, parser_getsel(p),        \
+                                  (ctype)val);                            \
+        return true;                                                      \
+      }                                                                   \
+      break;                                                              \
     }
+    case UPB_TYPE_ENUM:
+    CASE(INT32, int32, int32_t, INT32_MIN, INT32_MAX);
+    CASE(INT64, int64, int64_t, INT64_MIN, INT64_MAX);
+    CASE(UINT32, uint32, uint32_t, 0, UINT32_MAX);
+    CASE(UINT64, uint64, uint64_t, 0, UINT64_MAX);
+#undef CASE
+
+    case UPB_TYPE_DOUBLE:
+      upb_sink_putdouble(&p->top->sink, parser_getsel(p), val);
+      return true;
+    case UPB_TYPE_FLOAT:
+      if ((val > FLT_MAX || val < -FLT_MAX) && val != inf && val != -inf) {
+        return false;
+      } else {
+        upb_sink_putfloat(&p->top->sink, parser_getsel(p), val);
+        return true;
+      }
     default:
-      UPB_ASSERT(false);
+      return false;
   }
+}
 
-  multipart_end(p);
+static bool parse_number(upb_json_parser *p, bool is_quoted) {
+  size_t len;
+  const char *buf;
 
-  return true;
+  /* strtol() and friends unfortunately do not support specifying the length of
+   * the input string, so we need to force a copy into a NULL-terminated buffer. */
+  if (!multipart_text(p, "\0", 1, false)) {
+    return false;
+  }
 
-err:
-  upb_status_seterrf(&p->status, "error parsing number: %s", buf);
-  upb_env_reporterror(p->env, &p->status);
-  multipart_end(p);
-  return false;
+  buf = accumulate_getptr(p, &len);
+
+  if (parse_number_from_buffer(p, buf, is_quoted)) {
+    multipart_end(p);
+    return true;
+  } else {
+    upb_status_seterrf(&p->status, "error parsing number: %s", buf);
+    upb_env_reporterror(p->env, &p->status);
+    multipart_end(p);
+    return false;
+  }
 }
 
 static bool parser_putbool(upb_json_parser *p, bool val) {
@@ -12182,17 +13124,16 @@ static bool start_stringval(upb_json_parser *p) {
       multipart_startaccum(p);
       return true;
     }
-  } else if (upb_fielddef_type(p->top->f) == UPB_TYPE_ENUM) {
-    /* No need to push a frame -- symbolic enum names in quotes remain in the
-     * current parser frame.
-     *
-     * Enum string values must accumulate so we can look up the value in a table
-     * once it is complete. */
+  } else if (upb_fielddef_type(p->top->f) != UPB_TYPE_BOOL &&
+             upb_fielddef_type(p->top->f) != UPB_TYPE_MESSAGE) {
+    /* No need to push a frame -- numeric values in quotes remain in the
+     * current parser frame.  These values must accmulate so we can convert
+     * them all at once at the end. */
     multipart_startaccum(p);
     return true;
   } else {
     upb_status_seterrf(&p->status,
-                       "String specified for non-string/non-enum field: %s",
+                       "String specified for bool or submessage field: %s",
                        upb_fielddef_name(p->top->f));
     upb_env_reporterror(p->env, &p->status);
     return false;
@@ -12239,6 +13180,15 @@ static bool end_stringval(upb_json_parser *p) {
       break;
     }
 
+    case UPB_TYPE_INT32:
+    case UPB_TYPE_INT64:
+    case UPB_TYPE_UINT32:
+    case UPB_TYPE_UINT64:
+    case UPB_TYPE_DOUBLE:
+    case UPB_TYPE_FLOAT:
+      ok = parse_number(p, true);
+      break;
+
     default:
       UPB_ASSERT(false);
       upb_status_seterrmsg(&p->status, "Internal error in JSON decoder");
@@ -12282,7 +13232,7 @@ static bool parse_mapentry_key(upb_json_parser *p) {
     case UPB_TYPE_UINT32:
     case UPB_TYPE_UINT64:
       /* Invoke end_number. The accum buffer has the number's text already. */
-      if (!parse_number(p)) {
+      if (!parse_number(p, true)) {
         return false;
       }
       break;
@@ -12573,11 +13523,11 @@ static void end_object(upb_json_parser *p) {
  * final state once, when the closing '"' is seen. */
 
 
-#line 1244 "upb/json/parser.rl"
+#line 1310 "upb/json/parser.rl"
 
 
 
-#line 1156 "upb/json/parser.c"
+#line 1222 "upb/json/parser.c"
 static const char _json_actions[] = {
 	0, 1, 0, 1, 2, 1, 3, 1, 
 	5, 1, 6, 1, 7, 1, 8, 1, 
@@ -12726,7 +13676,7 @@ static const int json_en_value_machine = 27;
 static const int json_en_main = 1;
 
 
-#line 1247 "upb/json/parser.rl"
+#line 1313 "upb/json/parser.rl"
 
 size_t parse(void *closure, const void *hd, const char *buf, size_t size,
              const upb_bufhandle *handle) {
@@ -12748,7 +13698,7 @@ size_t parse(void *closure, const void *hd, const char *buf, size_t size,
   capture_resume(parser, buf);
 
   
-#line 1327 "upb/json/parser.c"
+#line 1393 "upb/json/parser.c"
 	{
 	int _klen;
 	unsigned int _trans;
@@ -12823,118 +13773,118 @@ _match:
 		switch ( *_acts++ )
 		{
 	case 0:
-#line 1159 "upb/json/parser.rl"
+#line 1225 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 1:
-#line 1160 "upb/json/parser.rl"
+#line 1226 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 10; goto _again;} }
 	break;
 	case 2:
-#line 1164 "upb/json/parser.rl"
+#line 1230 "upb/json/parser.rl"
 	{ start_text(parser, p); }
 	break;
 	case 3:
-#line 1165 "upb/json/parser.rl"
+#line 1231 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_text(parser, p)); }
 	break;
 	case 4:
-#line 1171 "upb/json/parser.rl"
+#line 1237 "upb/json/parser.rl"
 	{ start_hex(parser); }
 	break;
 	case 5:
-#line 1172 "upb/json/parser.rl"
+#line 1238 "upb/json/parser.rl"
 	{ hexdigit(parser, p); }
 	break;
 	case 6:
-#line 1173 "upb/json/parser.rl"
+#line 1239 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_hex(parser)); }
 	break;
 	case 7:
-#line 1179 "upb/json/parser.rl"
+#line 1245 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(escape(parser, p)); }
 	break;
 	case 8:
-#line 1185 "upb/json/parser.rl"
+#line 1251 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
 	case 9:
-#line 1188 "upb/json/parser.rl"
+#line 1254 "upb/json/parser.rl"
 	{ {stack[top++] = cs; cs = 19; goto _again;} }
 	break;
 	case 10:
-#line 1190 "upb/json/parser.rl"
+#line 1256 "upb/json/parser.rl"
 	{ p--; {stack[top++] = cs; cs = 27; goto _again;} }
 	break;
 	case 11:
-#line 1195 "upb/json/parser.rl"
+#line 1261 "upb/json/parser.rl"
 	{ start_member(parser); }
 	break;
 	case 12:
-#line 1196 "upb/json/parser.rl"
+#line 1262 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_membername(parser)); }
 	break;
 	case 13:
-#line 1199 "upb/json/parser.rl"
+#line 1265 "upb/json/parser.rl"
 	{ end_member(parser); }
 	break;
 	case 14:
-#line 1205 "upb/json/parser.rl"
+#line 1271 "upb/json/parser.rl"
 	{ start_object(parser); }
 	break;
 	case 15:
-#line 1208 "upb/json/parser.rl"
+#line 1274 "upb/json/parser.rl"
 	{ end_object(parser); }
 	break;
 	case 16:
-#line 1214 "upb/json/parser.rl"
+#line 1280 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_array(parser)); }
 	break;
 	case 17:
-#line 1218 "upb/json/parser.rl"
+#line 1284 "upb/json/parser.rl"
 	{ end_array(parser); }
 	break;
 	case 18:
-#line 1223 "upb/json/parser.rl"
+#line 1289 "upb/json/parser.rl"
 	{ start_number(parser, p); }
 	break;
 	case 19:
-#line 1224 "upb/json/parser.rl"
+#line 1290 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_number(parser, p)); }
 	break;
 	case 20:
-#line 1226 "upb/json/parser.rl"
+#line 1292 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_stringval(parser)); }
 	break;
 	case 21:
-#line 1227 "upb/json/parser.rl"
+#line 1293 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(end_stringval(parser)); }
 	break;
 	case 22:
-#line 1229 "upb/json/parser.rl"
+#line 1295 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(parser_putbool(parser, true)); }
 	break;
 	case 23:
-#line 1231 "upb/json/parser.rl"
+#line 1297 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(parser_putbool(parser, false)); }
 	break;
 	case 24:
-#line 1233 "upb/json/parser.rl"
+#line 1299 "upb/json/parser.rl"
 	{ /* null value */ }
 	break;
 	case 25:
-#line 1235 "upb/json/parser.rl"
+#line 1301 "upb/json/parser.rl"
 	{ CHECK_RETURN_TOP(start_subobject(parser)); }
 	break;
 	case 26:
-#line 1236 "upb/json/parser.rl"
+#line 1302 "upb/json/parser.rl"
 	{ end_subobject(parser); }
 	break;
 	case 27:
-#line 1241 "upb/json/parser.rl"
+#line 1307 "upb/json/parser.rl"
 	{ p--; {cs = stack[--top]; goto _again;} }
 	break;
-#line 1513 "upb/json/parser.c"
+#line 1579 "upb/json/parser.c"
 		}
 	}
 
@@ -12947,7 +13897,7 @@ _again:
 	_out: {}
 	}
 
-#line 1268 "upb/json/parser.rl"
+#line 1334 "upb/json/parser.rl"
 
   if (p != pe) {
     upb_status_seterrf(&parser->status, "Parse error at '%.*s'\n", pe - p, p);
@@ -12988,13 +13938,13 @@ static void json_parser_reset(upb_json_parser *p) {
 
   /* Emit Ragel initialization of the parser. */
   
-#line 1567 "upb/json/parser.c"
+#line 1633 "upb/json/parser.c"
 	{
 	cs = json_start;
 	top = 0;
 	}
 
-#line 1308 "upb/json/parser.rl"
+#line 1374 "upb/json/parser.rl"
   p->current_state = cs;
   p->parser_top = top;
   accumulate_clear(p);
@@ -13291,10 +14241,23 @@ static void putstring(upb_json_printer *p, const char *buf, unsigned int len) {
  * Right now we use %.8g and %.17g for float/double, respectively, to match
  * proto2::util::JsonFormat's defaults.  May want to change this later. */
 
+const char neginf[] = "\"-Infinity\"";
+const char inf[] = "\"Infinity\"";
+
 static size_t fmt_double(double val, char* buf, size_t length) {
-  size_t n = _upb_snprintf(buf, length, "%.17g", val);
-  CHKLENGTH(n > 0 && n < length);
-  return n;
+  if (val == (1.0 / 0.0)) {
+    CHKLENGTH(length >= strlen(inf));
+    strcpy(buf, inf);
+    return strlen(inf);
+  } else if (val == (-1.0 / 0.0)) {
+    CHKLENGTH(length >= strlen(neginf));
+    strcpy(buf, neginf);
+    return strlen(neginf);
+  } else {
+    size_t n = _upb_snprintf(buf, length, "%.17g", val);
+    CHKLENGTH(n > 0 && n < length);
+    return n;
+  }
 }
 
 static size_t fmt_float(float val, char* buf, size_t length) {
diff --git a/ruby/ext/google/protobuf_c/upb.h b/ruby/ext/google/protobuf_c/upb.h
index 6e1e6c6f..f441c89c 100644
--- a/ruby/ext/google/protobuf_c/upb.h
+++ b/ruby/ext/google/protobuf_c/upb.h
@@ -1,70 +1,5 @@
 // Amalgamated source file
 /*
-** Defs are upb's internal representation of the constructs that can appear
-** in a .proto file:
-**
-** - upb::MessageDef (upb_msgdef): describes a "message" construct.
-** - upb::FieldDef (upb_fielddef): describes a message field.
-** - upb::FileDef (upb_filedef): describes a .proto file and its defs.
-** - upb::EnumDef (upb_enumdef): describes an enum.
-** - upb::OneofDef (upb_oneofdef): describes a oneof.
-** - upb::Def (upb_def): base class of all the others.
-**
-** TODO: definitions of services.
-**
-** Like upb_refcounted objects, defs are mutable only until frozen, and are
-** only thread-safe once frozen.
-**
-** This is a mixed C/C++ interface that offers a full API to both languages.
-** See the top-level README for more information.
-*/
-
-#ifndef UPB_DEF_H_
-#define UPB_DEF_H_
-
-/*
-** upb::RefCounted (upb_refcounted)
-**
-** A refcounting scheme that supports circular refs.  It accomplishes this by
-** partitioning the set of objects into groups such that no cycle spans groups;
-** we can then reference-count the group as a whole and ignore refs within the
-** group.  When objects are mutable, these groups are computed very
-** conservatively; we group any objects that have ever had a link between them.
-** When objects are frozen, we compute strongly-connected components which
-** allows us to be precise and only group objects that are actually cyclic.
-**
-** This is a mixed C/C++ interface that offers a full API to both languages.
-** See the top-level README for more information.
-*/
-
-#ifndef UPB_REFCOUNTED_H_
-#define UPB_REFCOUNTED_H_
-
-/*
-** upb_table
-**
-** This header is INTERNAL-ONLY!  Its interfaces are not public or stable!
-** This file defines very fast int->upb_value (inttable) and string->upb_value
-** (strtable) hash tables.
-**
-** The table uses chained scatter with Brent's variation (inspired by the Lua
-** implementation of hash tables).  The hash function for strings is Austin
-** Appleby's "MurmurHash."
-**
-** The inttable uses uintptr_t as its key, which guarantees it can be used to
-** store pointers or integers of at least 32 bits (upb isn't really useful on
-** systems where sizeof(void*) < 4).
-**
-** The table must be homogenous (all values of the same type).  In debug
-** mode, we check this on insert and lookup.
-*/
-
-#ifndef UPB_TABLE_H_
-#define UPB_TABLE_H_
-
-#include <stdint.h>
-#include <string.h>
-/*
 ** This file contains shared definitions that are widely used across upb.
 **
 ** This is a mixed C/C++ interface that offers a full API to both languages.
@@ -100,6 +35,9 @@ template <int N> class InlinedEnvironment;
 #define UPB_INLINE static
 #endif
 
+/* Hints to the compiler about likely/unlikely branches. */
+#define UPB_LIKELY(x) __builtin_expect((x),1)
+
 /* Define UPB_BIG_ENDIAN manually if you're on big endian and your compiler
  * doesn't provide these preprocessor symbols. */
 #if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
@@ -361,6 +299,16 @@ class PointerBase2 : public PointerBase<T, Base> {
 
 #endif
 
+/* A list of types as they are encoded on-the-wire. */
+typedef enum {
+  UPB_WIRE_TYPE_VARINT      = 0,
+  UPB_WIRE_TYPE_64BIT       = 1,
+  UPB_WIRE_TYPE_DELIMITED   = 2,
+  UPB_WIRE_TYPE_START_GROUP = 3,
+  UPB_WIRE_TYPE_END_GROUP   = 4,
+  UPB_WIRE_TYPE_32BIT       = 5
+} upb_wiretype_t;
+
 
 /* upb::ErrorSpace ************************************************************/
 
@@ -689,7 +637,7 @@ void upb_env_uninit(upb_env *e);
 
 void upb_env_initonly(upb_env *e);
 
-upb_arena *upb_env_arena(upb_env *e);
+UPB_INLINE upb_arena *upb_env_arena(upb_env *e) { return (upb_arena*)e; }
 bool upb_env_ok(const upb_env *e);
 void upb_env_seterrorfunc(upb_env *e, upb_error_func *func, void *ud);
 
@@ -789,6 +737,106 @@ template <int N> class upb::InlinedEnvironment : public upb::Environment {
 
 
 #endif  /* UPB_H_ */
+/*
+** upb_decode: parsing into a upb_msg using a upb_msglayout.
+*/
+
+#ifndef UPB_DECODE_H_
+#define UPB_DECODE_H_
+
+/*
+** upb::Message is a representation for protobuf messages.
+**
+** However it differs from other common representations like
+** google::protobuf::Message in one key way: it does not prescribe any
+** ownership between messages and submessages, and it relies on the
+** client to delete each message/submessage/array/map at the appropriate
+** time.
+**
+** A client can access a upb::Message without knowing anything about
+** ownership semantics, but to create or mutate a message a user needs
+** to implement the memory management themselves.
+**
+** Currently all messages, arrays, and maps store a upb_alloc* internally.
+** Mutating operations use this when they require dynamically-allocated
+** memory.  We could potentially eliminate this size overhead later by
+** letting the user flip a bit on the factory that prevents this from
+** being stored.  The user would then need to use separate functions where
+** the upb_alloc* is passed explicitly.  However for handlers to populate
+** such structures, they would need a place to store this upb_alloc* during
+** parsing; upb_handlers don't currently have a good way to accommodate this.
+**
+** TODO: UTF-8 checking?
+**/
+
+#ifndef UPB_MSG_H_
+#define UPB_MSG_H_
+
+/*
+** Defs are upb's internal representation of the constructs that can appear
+** in a .proto file:
+**
+** - upb::MessageDef (upb_msgdef): describes a "message" construct.
+** - upb::FieldDef (upb_fielddef): describes a message field.
+** - upb::FileDef (upb_filedef): describes a .proto file and its defs.
+** - upb::EnumDef (upb_enumdef): describes an enum.
+** - upb::OneofDef (upb_oneofdef): describes a oneof.
+** - upb::Def (upb_def): base class of all the others.
+**
+** TODO: definitions of services.
+**
+** Like upb_refcounted objects, defs are mutable only until frozen, and are
+** only thread-safe once frozen.
+**
+** This is a mixed C/C++ interface that offers a full API to both languages.
+** See the top-level README for more information.
+*/
+
+#ifndef UPB_DEF_H_
+#define UPB_DEF_H_
+
+/*
+** upb::RefCounted (upb_refcounted)
+**
+** A refcounting scheme that supports circular refs.  It accomplishes this by
+** partitioning the set of objects into groups such that no cycle spans groups;
+** we can then reference-count the group as a whole and ignore refs within the
+** group.  When objects are mutable, these groups are computed very
+** conservatively; we group any objects that have ever had a link between them.
+** When objects are frozen, we compute strongly-connected components which
+** allows us to be precise and only group objects that are actually cyclic.
+**
+** This is a mixed C/C++ interface that offers a full API to both languages.
+** See the top-level README for more information.
+*/
+
+#ifndef UPB_REFCOUNTED_H_
+#define UPB_REFCOUNTED_H_
+
+/*
+** upb_table
+**
+** This header is INTERNAL-ONLY!  Its interfaces are not public or stable!
+** This file defines very fast int->upb_value (inttable) and string->upb_value
+** (strtable) hash tables.
+**
+** The table uses chained scatter with Brent's variation (inspired by the Lua
+** implementation of hash tables).  The hash function for strings is Austin
+** Appleby's "MurmurHash."
+**
+** The inttable uses uintptr_t as its key, which guarantees it can be used to
+** store pointers or integers of at least 32 bits (upb isn't really useful on
+** systems where sizeof(void*) < 4).
+**
+** The table must be homogenous (all values of the same type).  In debug
+** mode, we check this on insert and lookup.
+*/
+
+#ifndef UPB_TABLE_H_
+#define UPB_TABLE_H_
+
+#include <stdint.h>
+#include <string.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -2966,6 +3014,17 @@ class upb::FileDef {
   const char* package() const;
   bool set_package(const char* package, Status* s);
 
+  /* Sets the php class prefix which is prepended to all php generated classes
+   * from this .proto. Default is empty. */
+  const char* phpprefix() const;
+  bool set_phpprefix(const char* phpprefix, Status* s);
+
+  /* Use this option to change the namespace of php generated classes. Default
+   * is empty. When this option is empty, the package name will be used for
+   * determining the namespace. */
+  const char* phpnamespace() const;
+  bool set_phpnamespace(const char* phpnamespace, Status* s);
+
   /* Syntax for the file.  Defaults to proto2. */
   upb_syntax_t syntax() const;
   void set_syntax(upb_syntax_t syntax);
@@ -3019,6 +3078,8 @@ UPB_REFCOUNTED_CMETHODS(upb_filedef, upb_filedef_upcast)
 
 const char *upb_filedef_name(const upb_filedef *f);
 const char *upb_filedef_package(const upb_filedef *f);
+const char *upb_filedef_phpprefix(const upb_filedef *f);
+const char *upb_filedef_phpnamespace(const upb_filedef *f);
 upb_syntax_t upb_filedef_syntax(const upb_filedef *f);
 size_t upb_filedef_defcount(const upb_filedef *f);
 size_t upb_filedef_depcount(const upb_filedef *f);
@@ -3028,6 +3089,10 @@ const upb_filedef *upb_filedef_dep(const upb_filedef *f, size_t i);
 bool upb_filedef_freeze(upb_filedef *f, upb_status *s);
 bool upb_filedef_setname(upb_filedef *f, const char *name, upb_status *s);
 bool upb_filedef_setpackage(upb_filedef *f, const char *package, upb_status *s);
+bool upb_filedef_setphpprefix(upb_filedef *f, const char *phpprefix,
+                              upb_status *s);
+bool upb_filedef_setphpnamespace(upb_filedef *f, const char *phpnamespace,
+                                 upb_status *s);
 bool upb_filedef_setsyntax(upb_filedef *f, upb_syntax_t syntax, upb_status *s);
 
 bool upb_filedef_adddef(upb_filedef *f, upb_def *def, const void *ref_donor,
@@ -3786,6 +3851,18 @@ inline const char* FileDef::package() const {
 inline bool FileDef::set_package(const char* package, Status* s) {
   return upb_filedef_setpackage(this, package, s);
 }
+inline const char* FileDef::phpprefix() const {
+  return upb_filedef_phpprefix(this);
+}
+inline bool FileDef::set_phpprefix(const char* phpprefix, Status* s) {
+  return upb_filedef_setphpprefix(this, phpprefix, s);
+}
+inline const char* FileDef::phpnamespace() const {
+  return upb_filedef_phpnamespace(this);
+}
+inline bool FileDef::set_phpnamespace(const char* phpnamespace, Status* s) {
+  return upb_filedef_setphpnamespace(this, phpnamespace, s);
+}
 inline int FileDef::def_count() const {
   return upb_filedef_defcount(this);
 }
@@ -3822,194 +3899,6 @@ inline bool FileDef::AddDependency(const FileDef* file) {
 
 #endif /* UPB_DEF_H_ */
 /*
-** This file contains definitions of structs that should be considered private
-** and NOT stable across versions of upb.
-**
-** The only reason they are declared here and not in .c files is to allow upb
-** and the application (if desired) to embed statically-initialized instances
-** of structures like defs.
-**
-** If you include this file, all guarantees of ABI compatibility go out the
-** window!  Any code that includes this file needs to recompile against the
-** exact same version of upb that they are linking against.
-**
-** You also need to recompile if you change the value of the UPB_DEBUG_REFS
-** flag.
-*/
-
-
-#ifndef UPB_STATICINIT_H_
-#define UPB_STATICINIT_H_
-
-#ifdef __cplusplus
-/* Because of how we do our typedefs, this header can't be included from C++. */
-#error This file cannot be included from C++
-#endif
-
-/* upb_refcounted *************************************************************/
-
-
-/* upb_def ********************************************************************/
-
-struct upb_def {
-  upb_refcounted base;
-
-  const char *fullname;
-  const upb_filedef* file;
-  char type;  /* A upb_deftype_t (char to save space) */
-
-  /* Used as a flag during the def's mutable stage.  Must be false unless
-   * it is currently being used by a function on the stack.  This allows
-   * us to easily determine which defs were passed into the function's
-   * current invocation. */
-  bool came_from_user;
-};
-
-#define UPB_DEF_INIT(name, type, vtbl, refs, ref2s) \
-    { UPB_REFCOUNT_INIT(vtbl, refs, ref2s), name, NULL, type, false }
-
-
-/* upb_fielddef ***************************************************************/
-
-struct upb_fielddef {
-  upb_def base;
-
-  union {
-    int64_t sint;
-    uint64_t uint;
-    double dbl;
-    float flt;
-    void *bytes;
-  } defaultval;
-  union {
-    const upb_msgdef *def;  /* If !msg_is_symbolic. */
-    char *name;             /* If msg_is_symbolic. */
-  } msg;
-  union {
-    const upb_def *def;  /* If !subdef_is_symbolic. */
-    char *name;          /* If subdef_is_symbolic. */
-  } sub;  /* The msgdef or enumdef for this field, if upb_hassubdef(f). */
-  bool subdef_is_symbolic;
-  bool msg_is_symbolic;
-  const upb_oneofdef *oneof;
-  bool default_is_string;
-  bool type_is_set_;     /* False until type is explicitly set. */
-  bool is_extension_;
-  bool lazy_;
-  bool packed_;
-  upb_intfmt_t intfmt;
-  bool tagdelim;
-  upb_fieldtype_t type_;
-  upb_label_t label_;
-  uint32_t number_;
-  uint32_t selector_base;  /* Used to index into a upb::Handlers table. */
-  uint32_t index_;
-};
-
-extern const struct upb_refcounted_vtbl upb_fielddef_vtbl;
-
-#define UPB_FIELDDEF_INIT(label, type, intfmt, tagdelim, is_extension, lazy,   \
-                          packed, name, num, msgdef, subdef, selector_base,    \
-                          index, defaultval, refs, ref2s)                      \
-  {                                                                            \
-    UPB_DEF_INIT(name, UPB_DEF_FIELD, &upb_fielddef_vtbl, refs, ref2s),        \
-        defaultval, {msgdef}, {subdef}, NULL, false, false,                    \
-        type == UPB_TYPE_STRING || type == UPB_TYPE_BYTES, true, is_extension, \
-        lazy, packed, intfmt, tagdelim, type, label, num, selector_base, index \
-  }
-
-
-/* upb_msgdef *****************************************************************/
-
-struct upb_msgdef {
-  upb_def base;
-
-  size_t selector_count;
-  uint32_t submsg_field_count;
-
-  /* Tables for looking up fields by number and name. */
-  upb_inttable itof;  /* int to field */
-  upb_strtable ntof;  /* name to field/oneof */
-
-  /* Is this a map-entry message? */
-  bool map_entry;
-
-  /* Whether this message has proto2 or proto3 semantics. */
-  upb_syntax_t syntax;
-
-  /* TODO(haberman): proper extension ranges (there can be multiple). */
-};
-
-extern const struct upb_refcounted_vtbl upb_msgdef_vtbl;
-
-/* TODO: also support static initialization of the oneofs table. This will be
- * needed if we compile in descriptors that contain oneofs. */
-#define UPB_MSGDEF_INIT(name, selector_count, submsg_field_count, itof, ntof, \
-                        map_entry, syntax, refs, ref2s)                       \
-  {                                                                           \
-    UPB_DEF_INIT(name, UPB_DEF_MSG, &upb_fielddef_vtbl, refs, ref2s),         \
-        selector_count, submsg_field_count, itof, ntof, map_entry, syntax     \
-  }
-
-
-/* upb_enumdef ****************************************************************/
-
-struct upb_enumdef {
-  upb_def base;
-
-  upb_strtable ntoi;
-  upb_inttable iton;
-  int32_t defaultval;
-};
-
-extern const struct upb_refcounted_vtbl upb_enumdef_vtbl;
-
-#define UPB_ENUMDEF_INIT(name, ntoi, iton, defaultval, refs, ref2s) \
-  { UPB_DEF_INIT(name, UPB_DEF_ENUM, &upb_enumdef_vtbl, refs, ref2s), ntoi,    \
-    iton, defaultval }
-
-
-/* upb_oneofdef ***************************************************************/
-
-struct upb_oneofdef {
-  upb_refcounted base;
-
-  uint32_t index;  /* Index within oneofs. */
-  const char *name;
-  upb_strtable ntof;
-  upb_inttable itof;
-  const upb_msgdef *parent;
-};
-
-extern const struct upb_refcounted_vtbl upb_oneofdef_vtbl;
-
-#define UPB_ONEOFDEF_INIT(name, ntof, itof, refs, ref2s) \
-  { UPB_REFCOUNT_INIT(&upb_oneofdef_vtbl, refs, ref2s), 0, name, ntof, itof }
-
-
-/* upb_symtab *****************************************************************/
-
-struct upb_symtab {
-  upb_refcounted base;
-
-  upb_strtable symtab;
-};
-
-struct upb_filedef {
-  upb_refcounted base;
-
-  const char *name;
-  const char *package;
-  upb_syntax_t syntax;
-
-  upb_inttable defs;
-  upb_inttable deps;
-};
-
-extern const struct upb_refcounted_vtbl upb_filedef_vtbl;
-
-#endif  /* UPB_STATICINIT_H_ */
-/*
 ** upb::Handlers (upb_handlers)
 **
 ** A upb_handlers is like a virtual table for a upb_msgdef.  Each field of the
@@ -4113,7 +4002,8 @@ UPB_END_EXTERN_C
 /* Static selectors for upb::Handlers. */
 #define UPB_STARTMSG_SELECTOR 0
 #define UPB_ENDMSG_SELECTOR 1
-#define UPB_STATIC_SELECTOR_COUNT 2
+#define UPB_UNKNOWN_SELECTOR 2
+#define UPB_STATIC_SELECTOR_COUNT 3
 
 /* Static selectors for upb::BytesHandler. */
 #define UPB_STARTSTR_SELECTOR 0
@@ -4642,6 +4532,8 @@ UPB_BEGIN_EXTERN_C
 /* Native C API. */
 
 /* Handler function typedefs. */
+typedef bool upb_unknown_handlerfunc(void *c, const void *hd, const char *buf,
+                                     size_t n);
 typedef bool upb_startmsg_handlerfunc(void *c, const void*);
 typedef bool upb_endmsg_handlerfunc(void *c, const void *, upb_status *status);
 typedef void* upb_startfield_handlerfunc(void *c, const void *hd);
@@ -4695,6 +4587,8 @@ const upb_status *upb_handlers_status(upb_handlers *h);
 void upb_handlers_clearerr(upb_handlers *h);
 const upb_msgdef *upb_handlers_msgdef(const upb_handlers *h);
 bool upb_handlers_addcleanup(upb_handlers *h, void *p, upb_handlerfree *hfree);
+bool upb_handlers_setunknown(upb_handlers *h, upb_unknown_handlerfunc *func,
+                             upb_handlerattr *attr);
 
 bool upb_handlers_setstartmsg(upb_handlers *h, upb_startmsg_handlerfunc *func,
                               upb_handlerattr *attr);
@@ -6264,6 +6158,18 @@ UPB_INLINE size_t upb_sink_putstring(upb_sink *s, upb_selector_t sel,
   return handler(s->closure, hd, buf, n, handle);
 }
 
+UPB_INLINE bool upb_sink_putunknown(upb_sink *s, const char *buf, size_t n) {
+  typedef upb_unknown_handlerfunc func;
+  func *handler;
+  const void *hd;
+  if (!s->handlers) return true;
+  handler = (func *)upb_handlers_gethandler(s->handlers, UPB_UNKNOWN_SELECTOR);
+
+  if (!handler) return n;
+  hd = upb_handlers_gethandlerdata(s->handlers, UPB_UNKNOWN_SELECTOR);
+  return handler(s->closure, hd, buf, n);
+}
+
 UPB_INLINE bool upb_sink_startmsg(upb_sink *s) {
   typedef upb_startmsg_handlerfunc func;
   func *startmsg;
@@ -6468,34 +6374,6 @@ inline bool BufferSource::PutBuffer(const char *buf, size_t len,
 #endif
 
 #endif
-/*
-** upb::Message is a representation for protobuf messages.
-**
-** However it differs from other common representations like
-** google::protobuf::Message in one key way: it does not prescribe any
-** ownership between messages and submessages, and it relies on the
-** client to delete each message/submessage/array/map at the appropriate
-** time.
-**
-** A client can access a upb::Message without knowing anything about
-** ownership semantics, but to create or mutate a message a user needs
-** to implement the memory management themselves.
-**
-** Currently all messages, arrays, and maps store a upb_alloc* internally.
-** Mutating operations use this when they require dynamically-allocated
-** memory.  We could potentially eliminate this size overhead later by
-** letting the user flip a bit on the factory that prevents this from
-** being stored.  The user would then need to use separate functions where
-** the upb_alloc* is passed explicitly.  However for handlers to populate
-** such structures, they would need a place to store this upb_alloc* during
-** parsing; upb_handlers don't currently have a good way to accommodate this.
-**
-** TODO: UTF-8 checking?
-**/
-
-#ifndef UPB_MSG_H_
-#define UPB_MSG_H_
-
 
 #ifdef __cplusplus
 
@@ -6532,21 +6410,6 @@ typedef void upb_msg;
  * instances of this from a upb_msgfactory, and the factory always owns the
  * msglayout. */
 
-/* Gets the factory for this layout */
-upb_msgfactory *upb_msglayout_factory(const upb_msglayout *l);
-
-/* Get the msglayout for a submessage.  This requires that this field is a
- * submessage, ie. upb_fielddef_issubmsg(upb_msglayout_msgdef(l)) == true.
- *
- * Since map entry messages don't have layouts, if upb_fielddef_ismap(f) == true
- * then this function will return the layout for the map's value.  It requires
- * that the value type of the map field is a submessage. */
-const upb_msglayout *upb_msglayout_sublayout(const upb_msglayout *l,
-                                             const upb_fielddef *f);
-
-/* Returns the msgdef for this msglayout. */
-const upb_msgdef *upb_msglayout_msgdef(const upb_msglayout *l);
-
 
 /** upb_visitor ***************************************************************/
 
@@ -6592,6 +6455,23 @@ const upb_visitorplan *upb_msgfactory_getvisitorplan(upb_msgfactory *f,
                                                      const upb_handlers *h);
 
 
+/** upb_stringview ************************************************************/
+
+typedef struct {
+  const char *data;
+  size_t size;
+} upb_stringview;
+
+UPB_INLINE upb_stringview upb_stringview_make(const char *data, size_t size) {
+  upb_stringview ret;
+  ret.data = data;
+  ret.size = size;
+  return ret;
+}
+
+#define UPB_STRINGVIEW_INIT(ptr, len) {ptr, len}
+
+
 /** upb_msgval ****************************************************************/
 
 /* A union representing all possible protobuf values.  Used for generic get/set
@@ -6609,10 +6489,7 @@ typedef union {
   const upb_msg* msg;
   const upb_array* arr;
   const void* ptr;
-  struct {
-    const char *ptr;
-    size_t len;
-  } str;
+  upb_stringview str;
 } upb_msgval;
 
 #define ACCESSORS(name, membername, ctype) \
@@ -6639,22 +6516,12 @@ ACCESSORS(map,    map, const upb_map*)
 ACCESSORS(msg,    msg, const upb_msg*)
 ACCESSORS(ptr,    ptr, const void*)
 ACCESSORS(arr,    arr, const upb_array*)
+ACCESSORS(str,    str, upb_stringview)
 
 #undef ACCESSORS
 
-UPB_INLINE upb_msgval upb_msgval_str(const char *ptr, size_t len) {
-  upb_msgval ret;
-  ret.str.ptr = ptr;
-  ret.str.len = len;
-  return ret;
-}
-
-UPB_INLINE const char* upb_msgval_getstr(upb_msgval val) {
-  return val.str.ptr;
-}
-
-UPB_INLINE size_t upb_msgval_getstrlen(upb_msgval val) {
-  return val.str.len;
+UPB_INLINE upb_msgval upb_msgval_makestr(const char *data, size_t size) {
+  return upb_msgval_str(upb_stringview_make(data, size));
 }
 
 
@@ -6679,19 +6546,29 @@ size_t upb_msg_sizeof(const upb_msglayout *l);
  * upb_msg_uninit() must be called to release internally-allocated memory
  * unless the allocator is an arena that does not require freeing.
  *
+ * Please note that upb_msg_init() may return a value that is different than
+ * |msg|, so you must assign the return value and not cast your memory block
+ * to upb_msg* directly!
+ *
  * Please note that upb_msg_uninit() does *not* free any submessages, maps,
  * or arrays referred to by this message's fields.  You must free them manually
- * yourself. */
-void upb_msg_init(upb_msg *msg, const upb_msglayout *l, upb_alloc *a);
-void upb_msg_uninit(upb_msg *msg, const upb_msglayout *l);
+ * yourself.
+ *
+ * upb_msg_uninit returns the original memory block, which may be useful if
+ * you dynamically allocated it (though upb_msg_new() would normally be more
+ * appropriate in this case). */
+upb_msg *upb_msg_init(void *msg, const upb_msglayout *l, upb_alloc *a);
+void *upb_msg_uninit(upb_msg *msg, const upb_msglayout *l);
 
 /* Like upb_msg_init() / upb_msg_uninit(), except the message's memory is
  * allocated / freed from the given upb_alloc. */
 upb_msg *upb_msg_new(const upb_msglayout *l, upb_alloc *a);
 void upb_msg_free(upb_msg *msg, const upb_msglayout *l);
 
-/* Returns the upb_alloc for the given message. */
-upb_alloc *upb_msg_alloc(const upb_msg *msg, const upb_msglayout *l);
+/* Returns the upb_alloc for the given message.
+ * TODO(haberman): get rid of this?  Not sure we want to be storing this
+ * for every message. */
+upb_alloc *upb_msg_alloc(const upb_msg *msg);
 
 /* Packs the tree of messages rooted at "msg" into a single hunk of memory,
  * allocated from the given allocator. */
@@ -6711,25 +6588,14 @@ void *upb_msg_pack(const upb_msg *msg, const upb_msglayout *l,
  * arenas).
  */
 upb_msgval upb_msg_get(const upb_msg *msg,
-                       const upb_fielddef *f,
+                       int field_index,
                        const upb_msglayout *l);
 
 /* May only be called for fields where upb_fielddef_haspresence(f) == true. */
 bool upb_msg_has(const upb_msg *msg,
-                 const upb_fielddef *f,
+                 int field_index,
                  const upb_msglayout *l);
 
-/* Returns NULL if no field in the oneof is set. */
-const upb_fielddef *upb_msg_getoneofcase(const upb_msg *msg,
-                                         const upb_oneofdef *o,
-                                         const upb_msglayout *l);
-
-/* Returns true if any field in the oneof is set. */
-bool upb_msg_hasoneof(const upb_msg *msg,
-                      const upb_oneofdef *o,
-                      const upb_msglayout *l);
-
-
 /* Mutable message API.  May only be called by the owner of the message who
  * knows its ownership scheme and how to keep it consistent. */
 
@@ -6737,8 +6603,8 @@ bool upb_msg_hasoneof(const upb_msg *msg,
  * management: if you overwrite a pointer to a msg/array/map/string without
  * cleaning it up (or using an arena) it will leak.
  */
-bool upb_msg_set(upb_msg *msg,
-                 const upb_fielddef *f,
+void upb_msg_set(upb_msg *msg,
+                 int field_index,
                  upb_msgval val,
                  const upb_msglayout *l);
 
@@ -6749,12 +6615,7 @@ bool upb_msg_set(upb_msg *msg,
  * arrays/maps/strings/msgs that this field may have pointed to.
  */
 bool upb_msg_clearfield(upb_msg *msg,
-                        const upb_fielddef *f,
-                        const upb_msglayout *l);
-
-/* Clears all fields in the oneof such that none of them are set. */
-bool upb_msg_clearoneof(upb_msg *msg,
-                        const upb_oneofdef *o,
+                        int field_index,
                         const upb_msglayout *l);
 
 /* TODO(haberman): copyfrom()/mergefrom()? */
@@ -6867,9 +6728,288 @@ bool upb_msg_getscalarhandlerdata(const upb_handlers *h,
                                   size_t *offset,
                                   int32_t *hasbit);
 
+
+/** Interfaces for generated code *********************************************/
+
+#define UPB_NOT_IN_ONEOF UINT16_MAX
+#define UPB_NO_HASBIT UINT16_MAX
+#define UPB_NO_SUBMSG UINT16_MAX
+
+typedef struct {
+  uint32_t number;
+  uint32_t offset;  /* If in a oneof, offset of default in default_msg below. */
+  uint16_t hasbit;        /* UPB_NO_HASBIT if no hasbit. */
+  uint16_t oneof_index;   /* UPB_NOT_IN_ONEOF if not in a oneof. */
+  uint16_t submsg_index;  /* UPB_NO_SUBMSG if no submsg. */
+  uint8_t type;
+  uint8_t label;
+} upb_msglayout_fieldinit_v1;
+
+typedef struct {
+  uint32_t data_offset;
+  uint32_t case_offset;
+} upb_msglayout_oneofinit_v1;
+
+typedef struct upb_msglayout_msginit_v1 {
+  const struct upb_msglayout_msginit_v1 *const* submsgs;
+  const upb_msglayout_fieldinit_v1 *fields;
+  const upb_msglayout_oneofinit_v1 *oneofs;
+  void *default_msg;
+  /* Must be aligned to sizeof(void*).  Doesn't include internal members like
+   * unknown fields, extension dict, pointer to msglayout, etc. */
+  uint32_t size;
+  uint16_t field_count;
+  uint16_t oneof_count;
+  bool extendable;
+  bool is_proto2;
+} upb_msglayout_msginit_v1;
+
+#define UPB_ALIGN_UP_TO(val, align) ((val + (align - 1)) & -align)
+#define UPB_ALIGNED_SIZEOF(type) UPB_ALIGN_UP_TO(sizeof(type), sizeof(void*))
+
+/* Initialize/uninitialize a msglayout from a msginit.  If upb uses v1
+ * internally, this will not allocate any memory.  Should only be used by
+ * generated code. */
+upb_msglayout *upb_msglayout_frominit_v1(
+    const upb_msglayout_msginit_v1 *init, upb_alloc *a);
+void upb_msglayout_uninit_v1(upb_msglayout *layout, upb_alloc *a);
+
 UPB_END_EXTERN_C
 
 #endif /* UPB_MSG_H_ */
+
+UPB_BEGIN_EXTERN_C
+
+bool upb_decode(upb_stringview buf, void *msg,
+                const upb_msglayout_msginit_v1 *l, upb_env *env);
+
+UPB_END_EXTERN_C
+
+#endif  /* UPB_DECODE_H_ */
+/*
+** structs.int.h: structures definitions that are internal to upb.
+*/
+
+#ifndef UPB_STRUCTS_H_
+#define UPB_STRUCTS_H_
+
+struct upb_array {
+  upb_fieldtype_t type;
+  uint8_t element_size;
+  void *data;   /* Each element is element_size. */
+  size_t len;   /* Measured in elements. */
+  size_t size;  /* Measured in elements. */
+  upb_alloc *alloc;
+};
+
+#endif  /* UPB_STRUCTS_H_ */
+
+/*
+** This file contains definitions of structs that should be considered private
+** and NOT stable across versions of upb.
+**
+** The only reason they are declared here and not in .c files is to allow upb
+** and the application (if desired) to embed statically-initialized instances
+** of structures like defs.
+**
+** If you include this file, all guarantees of ABI compatibility go out the
+** window!  Any code that includes this file needs to recompile against the
+** exact same version of upb that they are linking against.
+**
+** You also need to recompile if you change the value of the UPB_DEBUG_REFS
+** flag.
+*/
+
+
+#ifndef UPB_STATICINIT_H_
+#define UPB_STATICINIT_H_
+
+#ifdef __cplusplus
+/* Because of how we do our typedefs, this header can't be included from C++. */
+#error This file cannot be included from C++
+#endif
+
+/* upb_refcounted *************************************************************/
+
+
+/* upb_def ********************************************************************/
+
+struct upb_def {
+  upb_refcounted base;
+
+  const char *fullname;
+  const upb_filedef* file;
+  char type;  /* A upb_deftype_t (char to save space) */
+
+  /* Used as a flag during the def's mutable stage.  Must be false unless
+   * it is currently being used by a function on the stack.  This allows
+   * us to easily determine which defs were passed into the function's
+   * current invocation. */
+  bool came_from_user;
+};
+
+#define UPB_DEF_INIT(name, type, vtbl, refs, ref2s) \
+    { UPB_REFCOUNT_INIT(vtbl, refs, ref2s), name, NULL, type, false }
+
+
+/* upb_fielddef ***************************************************************/
+
+struct upb_fielddef {
+  upb_def base;
+
+  union {
+    int64_t sint;
+    uint64_t uint;
+    double dbl;
+    float flt;
+    void *bytes;
+  } defaultval;
+  union {
+    const upb_msgdef *def;  /* If !msg_is_symbolic. */
+    char *name;             /* If msg_is_symbolic. */
+  } msg;
+  union {
+    const upb_def *def;  /* If !subdef_is_symbolic. */
+    char *name;          /* If subdef_is_symbolic. */
+  } sub;  /* The msgdef or enumdef for this field, if upb_hassubdef(f). */
+  bool subdef_is_symbolic;
+  bool msg_is_symbolic;
+  const upb_oneofdef *oneof;
+  bool default_is_string;
+  bool type_is_set_;     /* False until type is explicitly set. */
+  bool is_extension_;
+  bool lazy_;
+  bool packed_;
+  upb_intfmt_t intfmt;
+  bool tagdelim;
+  upb_fieldtype_t type_;
+  upb_label_t label_;
+  uint32_t number_;
+  uint32_t selector_base;  /* Used to index into a upb::Handlers table. */
+  uint32_t index_;
+};
+
+extern const struct upb_refcounted_vtbl upb_fielddef_vtbl;
+
+#define UPB_FIELDDEF_INIT(label, type, intfmt, tagdelim, is_extension, lazy,   \
+                          packed, name, num, msgdef, subdef, selector_base,    \
+                          index, defaultval, refs, ref2s)                      \
+  {                                                                            \
+    UPB_DEF_INIT(name, UPB_DEF_FIELD, &upb_fielddef_vtbl, refs, ref2s),        \
+        defaultval, {msgdef}, {subdef}, NULL, false, false,                    \
+        type == UPB_TYPE_STRING || type == UPB_TYPE_BYTES, true, is_extension, \
+        lazy, packed, intfmt, tagdelim, type, label, num, selector_base, index \
+  }
+
+
+/* upb_msgdef *****************************************************************/
+
+struct upb_msgdef {
+  upb_def base;
+
+  size_t selector_count;
+  uint32_t submsg_field_count;
+
+  /* Tables for looking up fields by number and name. */
+  upb_inttable itof;  /* int to field */
+  upb_strtable ntof;  /* name to field/oneof */
+
+  /* Is this a map-entry message? */
+  bool map_entry;
+
+  /* Whether this message has proto2 or proto3 semantics. */
+  upb_syntax_t syntax;
+
+  /* TODO(haberman): proper extension ranges (there can be multiple). */
+};
+
+extern const struct upb_refcounted_vtbl upb_msgdef_vtbl;
+
+/* TODO: also support static initialization of the oneofs table. This will be
+ * needed if we compile in descriptors that contain oneofs. */
+#define UPB_MSGDEF_INIT(name, selector_count, submsg_field_count, itof, ntof, \
+                        map_entry, syntax, refs, ref2s)                       \
+  {                                                                           \
+    UPB_DEF_INIT(name, UPB_DEF_MSG, &upb_fielddef_vtbl, refs, ref2s),         \
+        selector_count, submsg_field_count, itof, ntof, map_entry, syntax     \
+  }
+
+
+/* upb_enumdef ****************************************************************/
+
+struct upb_enumdef {
+  upb_def base;
+
+  upb_strtable ntoi;
+  upb_inttable iton;
+  int32_t defaultval;
+};
+
+extern const struct upb_refcounted_vtbl upb_enumdef_vtbl;
+
+#define UPB_ENUMDEF_INIT(name, ntoi, iton, defaultval, refs, ref2s) \
+  { UPB_DEF_INIT(name, UPB_DEF_ENUM, &upb_enumdef_vtbl, refs, ref2s), ntoi,    \
+    iton, defaultval }
+
+
+/* upb_oneofdef ***************************************************************/
+
+struct upb_oneofdef {
+  upb_refcounted base;
+
+  uint32_t index;  /* Index within oneofs. */
+  const char *name;
+  upb_strtable ntof;
+  upb_inttable itof;
+  const upb_msgdef *parent;
+};
+
+extern const struct upb_refcounted_vtbl upb_oneofdef_vtbl;
+
+#define UPB_ONEOFDEF_INIT(name, ntof, itof, refs, ref2s) \
+  { UPB_REFCOUNT_INIT(&upb_oneofdef_vtbl, refs, ref2s), 0, name, ntof, itof }
+
+
+/* upb_symtab *****************************************************************/
+
+struct upb_symtab {
+  upb_refcounted base;
+
+  upb_strtable symtab;
+};
+
+struct upb_filedef {
+  upb_refcounted base;
+
+  const char *name;
+  const char *package;
+  const char *phpprefix;
+  const char *phpnamespace;
+  upb_syntax_t syntax;
+
+  upb_inttable defs;
+  upb_inttable deps;
+};
+
+extern const struct upb_refcounted_vtbl upb_filedef_vtbl;
+
+#endif  /* UPB_STATICINIT_H_ */
+/*
+** upb_encode: parsing into a upb_msg using a upb_msglayout.
+*/
+
+#ifndef UPB_ENCODE_H_
+#define UPB_ENCODE_H_
+
+
+UPB_BEGIN_EXTERN_C
+
+char *upb_encode(const void *msg, const upb_msglayout_msginit_v1 *l,
+                 upb_env *env, size_t *size);
+
+UPB_END_EXTERN_C
+
+#endif  /* UPB_ENCODE_H_ */
 /*
 ** upb::descriptor::Reader (upb_descreader)
 **
@@ -7206,6 +7346,8 @@ UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_java_string
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_javanano_use_deprecated_package(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 38); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_objc_class_prefix(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 36); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_optimize_for(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 9); }
+UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_php_class_prefix(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 40); }
+UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_php_namespace(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 41); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_py_generic_services(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 18); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_FileOptions_f_uninterpreted_option(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_FileOptions_is(m)); return upb_msgdef_itof(m, 999); }
 UPB_INLINE const upb_fielddef *upbdefs_google_protobuf_MessageOptions_f_deprecated(const upb_msgdef *m) { UPB_ASSERT(upbdefs_google_protobuf_MessageOptions_is(m)); return upb_msgdef_itof(m, 3); }
@@ -8257,21 +8399,9 @@ UPB_INLINE void upb_pbdecoder_unpackdispatch(uint64_t dispatch, uint64_t *ofs,
 extern "C" {
 #endif
 
-/* A list of types as they are encoded on-the-wire. */
-typedef enum {
-  UPB_WIRE_TYPE_VARINT      = 0,
-  UPB_WIRE_TYPE_64BIT       = 1,
-  UPB_WIRE_TYPE_DELIMITED   = 2,
-  UPB_WIRE_TYPE_START_GROUP = 3,
-  UPB_WIRE_TYPE_END_GROUP   = 4,
-  UPB_WIRE_TYPE_32BIT       = 5
-} upb_wiretype_t;
-
 #define UPB_MAX_WIRE_TYPE 5
 
-/* The maximum number of bytes that it takes to encode a 64-bit varint.
- * Note that with a better encoding this could be 9 (TODO: write up a
- * wiki document about this). */
+/* The maximum number of bytes that it takes to encode a 64-bit varint. */
 #define UPB_PB_VARINT_MAX_LEN 10
 
 /* Array of the "native" (ie. non-packed-repeated) wire type for the given a
@@ -8304,16 +8434,8 @@ UPB_INLINE upb_decoderet upb_decoderet_make(const char *p, uint64_t val) {
   return ret;
 }
 
-/* Four functions for decoding a varint of at most eight bytes.  They are all
- * functionally identical, but are implemented in different ways and likely have
- * different performance profiles.  We keep them around for performance testing.
- *
- * Note that these functions may not read byte-by-byte, so they must not be used
- * unless there are at least eight bytes left in the buffer! */
 upb_decoderet upb_vdecode_max8_branch32(upb_decoderet r);
 upb_decoderet upb_vdecode_max8_branch64(upb_decoderet r);
-upb_decoderet upb_vdecode_max8_wright(upb_decoderet r);
-upb_decoderet upb_vdecode_max8_massimino(upb_decoderet r);
 
 /* Template for a function that checks the first two bytes with branching
  * and dispatches 2-10 bytes with a separate function.  Note that this may read
@@ -8338,8 +8460,6 @@ UPB_INLINE upb_decoderet upb_vdecode_check2_ ## name(const char *_p) {         \
 
 UPB_VARINT_DECODER_CHECK2(branch32, upb_vdecode_max8_branch32)
 UPB_VARINT_DECODER_CHECK2(branch64, upb_vdecode_max8_branch64)
-UPB_VARINT_DECODER_CHECK2(wright, upb_vdecode_max8_wright)
-UPB_VARINT_DECODER_CHECK2(massimino, upb_vdecode_max8_massimino)
 #undef UPB_VARINT_DECODER_CHECK2
 
 /* Our canonical functions for decoding varints, based on the currently
@@ -8351,10 +8471,6 @@ UPB_INLINE upb_decoderet upb_vdecode_fast(const char *p) {
     return upb_vdecode_check2_branch32(p);
 }
 
-UPB_INLINE upb_decoderet upb_vdecode_max8_fast(upb_decoderet r) {
-  return upb_vdecode_max8_massimino(r);
-}
-
 
 /* Encoding *******************************************************************/
 
diff --git a/javanano/src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto b/ruby/ext/google/protobuf_c/wrap_memcpy.c
index 29b944f0..394a52f9 100644
--- a/javanano/src/test/java/com/google/protobuf/nano/unittest_recursive_nano.proto
+++ b/ruby/ext/google/protobuf_c/wrap_memcpy.c
@@ -1,5 +1,5 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
+// Copyright 2017 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -28,22 +28,24 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: wink@google.com (Wink Saville)
-//
-
-package protobuf_unittest_import;
-
-option java_package = "com.google.protobuf";
-// Explicit outer classname to suppress legacy info.
-option java_outer_classname = "UnittestRecursiveNano";
+#include <string.h>
 
-message RecursiveMessageNano {
-  message NestedMessage {
-    optional RecursiveMessageNano a = 1;
-  }
-
-  required int32 id = 1;
-  optional NestedMessage nested_message = 2;
-  optional RecursiveMessageNano optional_recursive_message_nano = 3;
-  repeated RecursiveMessageNano repeated_recursive_message_nano = 4;
+// On x86-64 Linux with glibc, we link against the 2.2.5 version of memcpy so
+// that we avoid depending on the 2.14 version of the symbol. This way,
+// distributions that are using pre-2.14 versions of glibc can successfully use
+// the gem we distribute (https://github.com/google/protobuf/issues/2783).
+//
+// This wrapper is enabled by passing the linker flags -Wl,-wrap,memcpy in
+// extconf.rb.
+#ifdef __linux__
+#if defined(__x86_64__) && defined(__GNU_LIBRARY__)
+__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
+void *__wrap_memcpy(void *dest, const void *src, size_t n) {
+    return memcpy(dest, src, n);
+}
+#else
+void *__wrap_memcpy(void *dest, const void *src, size_t n) {
+    return memmove(dest, src, n);
 }
+#endif
+#endif
diff --git a/ruby/google-protobuf.gemspec b/ruby/google-protobuf.gemspec
index 97bf9970..c09a7f24 100644
--- a/ruby/google-protobuf.gemspec
+++ b/ruby/google-protobuf.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name        = "google-protobuf"
-  s.version     = "3.2.0"
-  s.licenses    = ["BSD"]
+  s.version     = "3.5.2"
+  s.licenses    = ["BSD-3-Clause"]
   s.summary     = "Protocol Buffers"
   s.description = "Protocol Buffers are Google's data interchange format."
   s.homepage    = "https://developers.google.com/protocol-buffers"
@@ -15,12 +15,12 @@ Gem::Specification.new do |s|
   else
     s.files     += Dir.glob('ext/**/*')
     s.extensions= ["ext/google/protobuf_c/extconf.rb"]
-    s.add_development_dependency "rake-compiler-dock", "~> 0.5.1"
+    s.add_development_dependency "rake-compiler-dock", "~> 0.6.0"
   end
   s.test_files  = ["tests/basic.rb",
                   "tests/stress.rb",
                   "tests/generated_code_test.rb"]
   s.add_development_dependency "rake-compiler", "~> 0.9.5"
-  s.add_development_dependency "test-unit", "~> 3.0.9"
+  s.add_development_dependency "test-unit", '~> 3.0', '>= 3.0.9'
   s.add_development_dependency "rubygems-tasks", "~> 0.2.4"
 end
diff --git a/ruby/lib/google/protobuf.rb b/ruby/lib/google/protobuf.rb
index 9b8d8231..4a805e88 100644
--- a/ruby/lib/google/protobuf.rb
+++ b/ruby/lib/google/protobuf.rb
@@ -60,8 +60,8 @@ module Google
       msg.to_proto
     end
 
-    def self.encode_json(msg)
-      msg.to_json
+    def self.encode_json(msg, options = {})
+      msg.to_json(options)
     end
 
     def self.decode(klass, proto)
diff --git a/ruby/lib/google/protobuf/message_exts.rb b/ruby/lib/google/protobuf/message_exts.rb
index e10266ba..f432f89f 100644
--- a/ruby/lib/google/protobuf/message_exts.rb
+++ b/ruby/lib/google/protobuf/message_exts.rb
@@ -40,8 +40,8 @@ module Google
       module ClassMethods
       end
 
-      def to_json
-        self.class.encode_json(self)
+      def to_json(options = {})
+        self.class.encode_json(self, options)
       end
 
       def to_proto
diff --git a/ruby/lib/google/protobuf/repeated_field.rb b/ruby/lib/google/protobuf/repeated_field.rb
index 11d6c2eb..2dae1e65 100644
--- a/ruby/lib/google/protobuf/repeated_field.rb
+++ b/ruby/lib/google/protobuf/repeated_field.rb
@@ -150,12 +150,12 @@ module Google
       end
 
 
-      %w(delete delete_at delete_if shift slice! unshift).each do |method_name|
+      %w(delete delete_at shift slice! unshift).each do |method_name|
         define_array_wrapper_method(method_name)
       end
 
 
-      %w(collect! compact! fill flatten! insert reverse!
+      %w(collect! compact! delete_if fill flatten! insert reverse!
         rotate! select! shuffle! sort! sort_by! uniq!).each do |method_name|
         define_array_wrapper_with_result_method(method_name)
       end
diff --git a/ruby/lib/google/protobuf/well_known_types.rb b/ruby/lib/google/protobuf/well_known_types.rb
index 547de874..921ddbc0 100644
--- a/ruby/lib/google/protobuf/well_known_types.rb
+++ b/ruby/lib/google/protobuf/well_known_types.rb
@@ -80,7 +80,7 @@ module Google
       end
 
       def to_f
-        self.seconds + (self.nanos.to_f / 1_000_000_000)
+        self.seconds + (self.nanos.quo(1_000_000_000))
       end
     end
 
diff --git a/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java b/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
index 733ccfbc..07558fbc 100644
--- a/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
+++ b/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
@@ -82,8 +82,8 @@ public class RubyMessage extends RubyObject {
             hash.visitAll(new RubyHash.Visitor() {
                 @Override
                 public void visit(IRubyObject key, IRubyObject value) {
-                    if (!(key instanceof RubySymbol))
-                        throw runtime.newTypeError("Expected symbols as hash keys in initialization map.");
+                    if (!(key instanceof RubySymbol) && !(key instanceof RubyString))
+                        throw runtime.newTypeError("Expected string or symbols as hash keys in initialization map.");
                     final Descriptors.FieldDescriptor fieldDescriptor = findField(context, key);
 
                     if (Utils.isMapEntry(fieldDescriptor)) {
@@ -103,9 +103,15 @@ public class RubyMessage extends RubyObject {
                         if (oneof != null) {
                             oneofCases.put(oneof, fieldDescriptor);
                         }
+
+                        if (value instanceof RubyHash && fieldDescriptor.getType() == Descriptors.FieldDescriptor.Type.MESSAGE) {
+                            RubyDescriptor descriptor = (RubyDescriptor) getDescriptorForField(context, fieldDescriptor);
+                            RubyClass typeClass = (RubyClass) descriptor.msgclass(context);
+                            value = (IRubyObject) typeClass.newInstance(context, value, Block.NULL_BLOCK);
+                        }
+
                         fields.put(fieldDescriptor, value);
                     }
-
                 }
             });
         }
@@ -367,7 +373,19 @@ public class RubyMessage extends RubyObject {
         for (Descriptors.FieldDescriptor fdef : this.descriptor.getFields()) {
             IRubyObject value = getField(context, fdef);
             if (!value.isNil()) {
-                if (value.respondsTo("to_h")) {
+                if (fdef.isRepeated() && !fdef.isMapField()) {
+                    if (fdef.getType() != Descriptors.FieldDescriptor.Type.MESSAGE) {
+                        value = Helpers.invoke(context, value, "to_a");
+                    } else {
+                        RubyArray ary = value.convertToArray();
+                        for (int i = 0; i < ary.size(); i++) {
+                            IRubyObject submsg = Helpers.invoke(context, ary.eltInternal(i), "to_h");
+                            ary.eltInternalSet(i, submsg);
+                        }
+
+                        value = ary.to_ary();
+                    }
+                } else if (value.respondsTo("to_h")) {
                     value = Helpers.invoke(context, value, "to_h");
                 } else if (value.respondsTo("to_a")) {
                     value = Helpers.invoke(context, value, "to_a");
@@ -518,19 +536,12 @@ public class RubyMessage extends RubyObject {
                 val = value.isTrue();
                 break;
             case BYTES:
+                Utils.validateStringEncoding(context, fieldDescriptor.getType(), value);
+                val = ByteString.copyFrom(((RubyString) value).getBytes());
+                break;
             case STRING:
                 Utils.validateStringEncoding(context, fieldDescriptor.getType(), value);
-                RubyString str = (RubyString) value;
-                switch (fieldDescriptor.getType()) {
-                    case BYTES:
-                        val = ByteString.copyFrom(str.getBytes());
-                        break;
-                    case STRING:
-                        val = str.asJavaString();
-                        break;
-                    default:
-                        break;
-                }
+                val = ((RubyString) value).asJavaString();
                 break;
             case MESSAGE:
                 RubyClass typeClass = (RubyClass) ((RubyDescriptor) getDescriptorForField(context, fieldDescriptor)).msgclass(context);
@@ -543,7 +554,7 @@ public class RubyMessage extends RubyObject {
 
                 if (Utils.isRubyNum(value)) {
                     val = enumDescriptor.findValueByNumberCreatingIfUnknown(RubyNumeric.num2int(value));
-                } else if (value instanceof RubySymbol) {
+                } else if (value instanceof RubySymbol || value instanceof RubyString) {
                     val = enumDescriptor.findValueByName(value.asJavaString());
                 } else {
                     throw runtime.newTypeError("Expected number or symbol type for enum field.");
@@ -741,8 +752,20 @@ public class RubyMessage extends RubyObject {
                                                   Descriptors.FieldDescriptor fieldDescriptor, IRubyObject value) {
         RubyArray arr = value.convertToArray();
         RubyRepeatedField repeatedField = repeatedFieldForFieldDescriptor(context, fieldDescriptor);
+
+        RubyClass typeClass = null;
+        if (fieldDescriptor.getType() == Descriptors.FieldDescriptor.Type.MESSAGE) {
+            RubyDescriptor descriptor = (RubyDescriptor) getDescriptorForField(context, fieldDescriptor);
+            typeClass = (RubyClass) descriptor.msgclass(context);
+        }
+
         for (int i = 0; i < arr.size(); i++) {
-            repeatedField.push(context, arr.eltInternal(i));
+            IRubyObject row = arr.eltInternal(i);
+            if (row instanceof RubyHash && typeClass != null) {
+                row = (IRubyObject) typeClass.newInstance(context, row, Block.NULL_BLOCK);
+            }
+
+            repeatedField.push(context, row);
         }
         return repeatedField;
     }
diff --git a/ruby/tests/basic.rb b/ruby/tests/basic.rb
index ca81e3a5..ad34d53d 100644
--- a/ruby/tests/basic.rb
+++ b/ruby/tests/basic.rb
@@ -1,6 +1,7 @@
 #!/usr/bin/ruby
 
 require 'google/protobuf'
+require 'json'
 require 'test/unit'
 
 # ------------- generated code --------------
@@ -50,6 +51,17 @@ module BasicTest
       optional :foo, :int32, 1
     end
 
+    add_message "TestEmbeddedMessageParent" do
+      optional :child_msg, :message, 1, "TestEmbeddedMessageChild"
+      optional :number, :int32, 2
+
+      repeated :repeated_msg, :message, 3, "TestEmbeddedMessageChild"
+      repeated :repeated_number, :int32, 4
+    end
+    add_message "TestEmbeddedMessageChild" do
+      optional :sub_child, :message, 1, "TestMessage"
+    end
+
     add_message "Recursive1" do
       optional :foo, :message, 1, "Recursive2"
     end
@@ -95,13 +107,25 @@ module BasicTest
         optional :d, :enum, 4, "TestEnum"
       end
     end
+
+    add_message "repro.Outer" do
+      map :items, :int32, :message, 1, "repro.Inner"
+    end
+
+    add_message "repro.Inner" do
+    end
   end
 
+
+  Outer = pool.lookup("repro.Outer").msgclass
+  Inner = pool.lookup("repro.Inner").msgclass
   Foo = pool.lookup("Foo").msgclass
   Bar = pool.lookup("Bar").msgclass
   Baz = pool.lookup("Baz").msgclass
   TestMessage = pool.lookup("TestMessage").msgclass
   TestMessage2 = pool.lookup("TestMessage2").msgclass
+  TestEmbeddedMessageParent = pool.lookup("TestEmbeddedMessageParent").msgclass
+  TestEmbeddedMessageChild = pool.lookup("TestEmbeddedMessageChild").msgclass
   Recursive1 = pool.lookup("Recursive1").msgclass
   Recursive2 = pool.lookup("Recursive2").msgclass
   TestEnum = pool.lookup("TestEnum").enummodule
@@ -150,12 +174,18 @@ module BasicTest
       m.optional_double = 0.5
       m.optional_string = "hello"
       assert m.optional_string == "hello"
+      m.optional_string = :hello
+      assert m.optional_string == "hello"
       m.optional_bytes = "world".encode!('ASCII-8BIT')
       assert m.optional_bytes == "world"
       m.optional_msg = TestMessage2.new(:foo => 42)
       assert m.optional_msg == TestMessage2.new(:foo => 42)
       m.optional_msg = nil
       assert m.optional_msg == nil
+      m.optional_enum = :C
+      assert m.optional_enum == :C
+      m.optional_enum = 'C'
+      assert m.optional_enum == :C
     end
 
     def test_ctor_args
@@ -172,6 +202,34 @@ module BasicTest
       assert m.repeated_string[2] == "world"
     end
 
+    def test_ctor_string_symbol_args
+      m = TestMessage.new(:optional_enum => 'C', :repeated_enum => ['A', 'B'])
+      assert_equal :C, m.optional_enum
+      assert_equal [:A, :B], m.repeated_enum
+
+      m = TestMessage.new(:optional_string => :foo, :repeated_string => [:foo, :bar])
+      assert_equal 'foo', m.optional_string
+      assert_equal ['foo', 'bar'], m.repeated_string
+    end
+
+    def test_embeddedmsg_hash_init
+      m = TestEmbeddedMessageParent.new(:child_msg => {sub_child: {optional_int32: 1}},
+                                        :number => 2,
+                                        :repeated_msg => [{sub_child: {optional_int32: 3}}],
+                                        :repeated_number => [10, 20, 30])
+
+      assert_equal 2, m.number
+      assert_equal [10, 20, 30], m.repeated_number
+
+      assert_not_nil m.child_msg
+      assert_not_nil m.child_msg.sub_child
+      assert_equal m.child_msg.sub_child.optional_int32, 1
+
+      assert_not_nil m.repeated_msg
+      assert_equal 1, m.repeated_msg.length
+      assert_equal 3, m.repeated_msg.first.sub_child.optional_int32
+    end
+
     def test_inspect
       m = TestMessage.new(:optional_int32 => -42,
                           :optional_enum => :A,
@@ -603,7 +661,7 @@ module BasicTest
       assert_raise RangeError do
         m["z"] = :Z
       end
-      assert_raise TypeError do
+      assert_raise RangeError do
         m["z"] = "z"
       end
     end
@@ -674,6 +732,21 @@ module BasicTest
       m.map_string_int32['aaa'] = 3
     end
 
+    def test_concurrent_decoding
+      o = Outer.new
+      o.items[0] = Inner.new
+      raw = Outer.encode(o)
+
+      thds = 2.times.map do
+        Thread.new do
+          100000.times do
+            assert_equal o, Outer.decode(raw)
+          end
+        end
+      end
+      thds.map(&:join)
+    end
+
     def test_map_encode_decode
       m = MapMessage.new(
         :map_string_int32 => {"a" => 1, "b" => 2},
@@ -901,7 +974,7 @@ module BasicTest
     end
 
     def test_to_h
-      m = TestMessage.new(:optional_bool => true, :optional_double => -10.100001, :optional_string => 'foo', :repeated_string => ['bar1', 'bar2'])
+      m = TestMessage.new(:optional_bool => true, :optional_double => -10.100001, :optional_string => 'foo', :repeated_string => ['bar1', 'bar2'], :repeated_msg => [TestMessage2.new(:foo => 100)])
       expected_result = {
         :optional_bool=>true,
         :optional_bytes=>"",
@@ -921,12 +994,22 @@ module BasicTest
         :repeated_float=>[],
         :repeated_int32=>[],
         :repeated_int64=>[],
-        :repeated_msg=>[],
+        :repeated_msg=>[{:foo => 100}],
         :repeated_string=>["bar1", "bar2"],
         :repeated_uint32=>[],
         :repeated_uint64=>[]
       }
       assert_equal expected_result, m.to_h
+
+      m = MapMessage.new(
+        :map_string_int32 => {"a" => 1, "b" => 2},
+        :map_string_msg => {"a" => TestMessage2.new(:foo => 1),
+                            "b" => TestMessage2.new(:foo => 2)})
+      expected_result = {
+        :map_string_int32 => {"a" => 1, "b" => 2},
+        :map_string_msg => {"a" => {:foo => 1}, "b" => {:foo => 2}}
+      }
+      assert_equal expected_result, m.to_h
     end
 
 
@@ -1163,6 +1246,8 @@ module BasicTest
 
       json_text = TestMessage.encode_json(m)
       m2 = TestMessage.decode_json(json_text)
+      puts m.inspect
+      puts m2.inspect
       assert m == m2
 
       # Crash case from GitHub issue 283.
@@ -1174,21 +1259,135 @@ module BasicTest
       Foo.encode_json(Foo.new(bar: bar, baz: [baz1, baz2]))
     end
 
+    def test_json_emit_defaults
+      # TODO: Fix JSON in JRuby version.
+      return if RUBY_PLATFORM == "java"
+      m = TestMessage.new
+
+      expected = {
+        optionalInt32: 0,
+        optionalInt64: 0,
+        optionalUint32: 0,
+        optionalUint64: 0,
+        optionalBool: false,
+        optionalFloat: 0,
+        optionalDouble: 0,
+        optionalString: "",
+        optionalBytes: "",
+        optionalEnum: "Default",
+        repeatedInt32: [],
+        repeatedInt64: [],
+        repeatedUint32: [],
+        repeatedUint64: [],
+        repeatedBool: [],
+        repeatedFloat: [],
+        repeatedDouble: [],
+        repeatedString: [],
+        repeatedBytes: [],
+        repeatedMsg: [],
+        repeatedEnum: []
+      }
+
+      actual = TestMessage.encode_json(m, :emit_defaults => true)
+
+      assert JSON.parse(actual, :symbolize_names => true) == expected
+    end
+
+    def test_json_emit_defaults_submsg
+      # TODO: Fix JSON in JRuby version.
+      return if RUBY_PLATFORM == "java"
+      m = TestMessage.new(optional_msg: TestMessage2.new)
+
+      expected = {
+        optionalInt32: 0,
+        optionalInt64: 0,
+        optionalUint32: 0,
+        optionalUint64: 0,
+        optionalBool: false,
+        optionalFloat: 0,
+        optionalDouble: 0,
+        optionalString: "",
+        optionalBytes: "",
+        optionalMsg: {foo: 0},
+        optionalEnum: "Default",
+        repeatedInt32: [],
+        repeatedInt64: [],
+        repeatedUint32: [],
+        repeatedUint64: [],
+        repeatedBool: [],
+        repeatedFloat: [],
+        repeatedDouble: [],
+        repeatedString: [],
+        repeatedBytes: [],
+        repeatedMsg: [],
+        repeatedEnum: []
+      }
+
+      actual = TestMessage.encode_json(m, :emit_defaults => true)
+
+      assert JSON.parse(actual, :symbolize_names => true) == expected
+    end
+
+    def test_json_emit_defaults_repeated_submsg
+      # TODO: Fix JSON in JRuby version.
+      return if RUBY_PLATFORM == "java"
+      m = TestMessage.new(repeated_msg: [TestMessage2.new])
+
+      expected = {
+        optionalInt32: 0,
+        optionalInt64: 0,
+        optionalUint32: 0,
+        optionalUint64: 0,
+        optionalBool: false,
+        optionalFloat: 0,
+        optionalDouble: 0,
+        optionalString: "",
+        optionalBytes: "",
+        optionalEnum: "Default",
+        repeatedInt32: [],
+        repeatedInt64: [],
+        repeatedUint32: [],
+        repeatedUint64: [],
+        repeatedBool: [],
+        repeatedFloat: [],
+        repeatedDouble: [],
+        repeatedString: [],
+        repeatedBytes: [],
+        repeatedMsg: [{foo: 0}],
+        repeatedEnum: []
+      }
+
+      actual = TestMessage.encode_json(m, :emit_defaults => true)
+
+      assert JSON.parse(actual, :symbolize_names => true) == expected
+    end
+
     def test_json_maps
       # TODO: Fix JSON in JRuby version.
       return if RUBY_PLATFORM == "java"
       m = MapMessage.new(:map_string_int32 => {"a" => 1})
-      expected = '{"mapStringInt32":{"a":1},"mapStringMsg":{}}'
-      expected_preserve = '{"map_string_int32":{"a":1},"map_string_msg":{}}'
-      assert MapMessage.encode_json(m) == expected
+      expected = {mapStringInt32: {a: 1}, mapStringMsg: {}}
+      expected_preserve = {map_string_int32: {a: 1}, map_string_msg: {}}
+      assert JSON.parse(MapMessage.encode_json(m), :symbolize_names => true) == expected
 
       json = MapMessage.encode_json(m, :preserve_proto_fieldnames => true)
-      assert json == expected_preserve
+      assert JSON.parse(json, :symbolize_names => true) == expected_preserve
 
       m2 = MapMessage.decode_json(MapMessage.encode_json(m))
       assert m == m2
     end
 
+    def test_json_maps_emit_defaults_submsg
+      # TODO: Fix JSON in JRuby version.
+      return if RUBY_PLATFORM == "java"
+      m = MapMessage.new(:map_string_msg => {"a" => TestMessage2.new})
+      expected = {mapStringInt32: {}, mapStringMsg: {a: {foo: 0}}}
+
+      actual = MapMessage.encode_json(m, :emit_defaults => true)
+
+      assert JSON.parse(actual, :symbolize_names => true) == expected
+    end
+
     def test_comparison_with_arbitrary_object
       assert MapMessage.new != nil
     end
diff --git a/ruby/tests/encode_decode_test.rb b/ruby/tests/encode_decode_test.rb
new file mode 100644
index 00000000..2bd9b98b
--- /dev/null
+++ b/ruby/tests/encode_decode_test.rb
@@ -0,0 +1,87 @@
+#!/usr/bin/ruby
+
+# generated_code.rb is in the same directory as this test.
+$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
+
+require 'generated_code_pb'
+require 'test/unit'
+
+def hex2bin(s)
+  s.scan(/../).map { |x| x.hex.chr }.join
+end
+
+class EncodeDecodeTest < Test::Unit::TestCase
+  def test_discard_unknown
+    # Test discard unknown in message.
+    unknown_msg = A::B::C::TestUnknown.new(:unknown_field => 1)
+    from = A::B::C::TestUnknown.encode(unknown_msg)
+    m = A::B::C::TestMessage.decode(from)
+    Google::Protobuf.discard_unknown(m)
+    to = A::B::C::TestMessage.encode(m)
+    assert_equal '', to
+
+    # Test discard unknown for singular message field.
+    unknown_msg = A::B::C::TestUnknown.new(
+	    :optional_unknown =>
+	    A::B::C::TestUnknown.new(:unknown_field => 1))
+    from = A::B::C::TestUnknown.encode(unknown_msg)
+    m = A::B::C::TestMessage.decode(from)
+    Google::Protobuf.discard_unknown(m)
+    to = A::B::C::TestMessage.encode(m.optional_msg)
+    assert_equal '', to
+
+    # Test discard unknown for repeated message field.
+    unknown_msg = A::B::C::TestUnknown.new(
+	    :repeated_unknown =>
+	    [A::B::C::TestUnknown.new(:unknown_field => 1)])
+    from = A::B::C::TestUnknown.encode(unknown_msg)
+    m = A::B::C::TestMessage.decode(from)
+    Google::Protobuf.discard_unknown(m)
+    to = A::B::C::TestMessage.encode(m.repeated_msg[0])
+    assert_equal '', to
+
+    # Test discard unknown for map value message field.
+    unknown_msg = A::B::C::TestUnknown.new(
+	    :map_unknown =>
+	    {"" => A::B::C::TestUnknown.new(:unknown_field => 1)})
+    from = A::B::C::TestUnknown.encode(unknown_msg)
+    m = A::B::C::TestMessage.decode(from)
+    Google::Protobuf.discard_unknown(m)
+    to = A::B::C::TestMessage.encode(m.map_string_msg[''])
+    assert_equal '', to
+
+    # Test discard unknown for oneof message field.
+    unknown_msg = A::B::C::TestUnknown.new(
+	    :oneof_unknown =>
+	    A::B::C::TestUnknown.new(:unknown_field => 1))
+    from = A::B::C::TestUnknown.encode(unknown_msg)
+    m = A::B::C::TestMessage.decode(from)
+    Google::Protobuf.discard_unknown(m)
+    to = A::B::C::TestMessage.encode(m.oneof_msg)
+    assert_equal '', to
+  end
+
+  def test_encode_json
+    msg = A::B::C::TestMessage.new({ optional_int32: 22 })
+    json = msg.to_json
+
+    to = A::B::C::TestMessage.decode_json(json)
+    assert_equal to.optional_int32, 22
+
+    msg = A::B::C::TestMessage.new({ optional_int32: 22 })
+    json = msg.to_json({ preserve_proto_fieldnames: true })
+
+    assert_match 'optional_int32', json
+
+    to = A::B::C::TestMessage.decode_json(json)
+    assert_equal 22, to.optional_int32
+
+    msg = A::B::C::TestMessage.new({ optional_int32: 22 })
+    json = A::B::C::TestMessage.encode_json(
+      msg,
+      { preserve_proto_fieldnames: true, emit_defaults: true }
+    )
+
+    assert_match 'optional_int32', json
+  end
+end
diff --git a/ruby/tests/gc_test.rb b/ruby/tests/gc_test.rb
new file mode 100644
index 00000000..f3470cca
--- /dev/null
+++ b/ruby/tests/gc_test.rb
@@ -0,0 +1,58 @@
+#!/usr/bin/ruby
+#
+# generated_code.rb is in the same directory as this test.
+$LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
+
+old_gc = GC.stress
+GC.stress = 0x01 | 0x04
+require 'generated_code_pb'
+GC.stress = old_gc
+
+require 'test/unit'
+
+class GCTest < Test::Unit::TestCase
+  def get_msg
+    A::B::C::TestMessage.new(
+        :optional_int32 => 1,
+        :optional_int64 => 1,
+        :optional_uint32 => 1,
+        :optional_uint64 => 1,
+        :optional_bool => true,
+        :optional_double => 1.0,
+        :optional_float => 1.0,
+        :optional_string => "a",
+        :optional_bytes => "b",
+        :optional_enum => A::B::C::TestEnum::A,
+        :optional_msg => A::B::C::TestMessage.new(),
+        :repeated_int32 => [1],
+        :repeated_int64 => [1],
+        :repeated_uint32 => [1],
+        :repeated_uint64 => [1],
+        :repeated_bool => [true],
+        :repeated_double => [1.0],
+        :repeated_float => [1.0],
+        :repeated_string => ["a"],
+        :repeated_bytes => ["b"],
+        :repeated_enum => [A::B::C::TestEnum::A],
+        :repeated_msg => [A::B::C::TestMessage.new()],
+        :map_int32_string => {1 => "a"},
+        :map_int64_string => {1 => "a"},
+        :map_uint32_string => {1 => "a"},
+        :map_uint64_string => {1 => "a"},
+        :map_bool_string => {true => "a"},
+        :map_string_string => {"a" => "a"},
+        :map_string_msg => {"a" => A::B::C::TestMessage.new()},
+        :map_string_int32 => {"a" => 1},
+        :map_string_bool => {"a" => true},
+    )
+  end
+  def test_generated_msg
+    old_gc = GC.stress
+    GC.stress = 0x01 | 0x04
+    from = get_msg
+    data = A::B::C::TestMessage.encode(from)
+    to = A::B::C::TestMessage.decode(data)
+    GC.stress = old_gc
+    puts "passed"
+  end
+end
diff --git a/ruby/tests/generated_code.proto b/ruby/tests/generated_code.proto
index 62fd83ed..3b934bd6 100644
--- a/ruby/tests/generated_code.proto
+++ b/ruby/tests/generated_code.proto
@@ -57,6 +57,9 @@ message TestMessage {
   }
 
   NestedMessage nested_message = 80;
+
+  // Reserved for non-existing field test.
+  // int32 non_exist = 89;
 }
 
 enum TestEnum {
@@ -65,3 +68,13 @@ enum TestEnum {
   B = 2;
   C = 3;
 }
+
+message TestUnknown {
+  TestUnknown optional_unknown = 11;
+  repeated TestUnknown repeated_unknown = 31;
+  oneof my_oneof {
+    TestUnknown oneof_unknown = 51;
+  }
+  map<string, TestUnknown> map_unknown = 67;
+  int32 unknown_field = 89;
+}
diff --git a/ruby/tests/generated_code_test.rb b/ruby/tests/generated_code_test.rb
index b92b0462..431d681b 100644
--- a/ruby/tests/generated_code_test.rb
+++ b/ruby/tests/generated_code_test.rb
@@ -5,6 +5,7 @@ $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__)))
 
 require 'generated_code_pb'
 require 'test_import_pb'
+require 'test_ruby_package_pb'
 require 'test/unit'
 
 class GeneratedCodeTest < Test::Unit::TestCase
@@ -15,5 +16,6 @@ class GeneratedCodeTest < Test::Unit::TestCase
     # aspect of the extension (basic.rb is for that).
     m = A::B::C::TestMessage.new()
     m2 = FooBar::TestImportedMessage.new()
+    m3 = A::B::TestRubyPackageMessage.new()
   end
 end
diff --git a/ruby/tests/repeated_field_test.rb b/ruby/tests/repeated_field_test.rb
index 25727b7b..61ac4afd 100644
--- a/ruby/tests/repeated_field_test.rb
+++ b/ruby/tests/repeated_field_test.rb
@@ -126,6 +126,12 @@ class RepeatedFieldTest < Test::Unit::TestCase
     assert_equal false, m.repeated_string.empty?
   end
 
+  def test_reassign
+    m = TestMessage.new
+    m.repeated_msg = Google::Protobuf::RepeatedField.new(:message, TestMessage2, [TestMessage2.new(:foo => 1)])
+    assert_equal m.repeated_msg.first, TestMessage2.new(:foo => 1)
+  end
+
   def test_array_accessor
     m = TestMessage.new
     reference_arr = %w(foo bar baz)
@@ -363,6 +369,15 @@ class RepeatedFieldTest < Test::Unit::TestCase
     end
   end
 
+  def test_delete_if
+    m = TestMessage.new
+    reference_arr = %w(foo bar baz)
+    m.repeated_string += reference_arr.clone
+    check_self_modifying_method(m.repeated_string, reference_arr) do |arr|
+      arr.delete_if { |v| v == "bar" }
+    end
+  end
+
   def test_fill
     m = TestMessage.new
     reference_arr = %w(foo bar baz)
diff --git a/ruby/tests/test_ruby_package.proto b/ruby/tests/test_ruby_package.proto
new file mode 100644
index 00000000..b8725620
--- /dev/null
+++ b/ruby/tests/test_ruby_package.proto
@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package foo_bar;
+
+option ruby_package = "A.B";
+
+message TestRubyPackageMessage {}
diff --git a/ruby/tests/well_known_types_test.rb b/ruby/tests/well_known_types_test.rb
index 9b46632b..bd24c328 100644
--- a/ruby/tests/well_known_types_test.rb
+++ b/ruby/tests/well_known_types_test.rb
@@ -13,10 +13,18 @@ class TestWellKnownTypes < Test::Unit::TestCase
     assert_equal Time.at(12345), ts.to_time
     assert_equal 12345, ts.to_i
 
-    ts.from_time(Time.at(123456, 654321))
+    # millisecond accuracy
+    time = Time.at(123456, 654321)
+    ts.from_time(time)
     assert_equal 123456, ts.seconds
     assert_equal 654321000, ts.nanos
-    assert_equal Time.at(123456.654321), ts.to_time
+    assert_equal time, ts.to_time
+
+    # nanosecond accuracy
+    time = Time.at(123456, Rational(654321321, 1000))
+    ts.from_time(time)
+    assert_equal 654321321, ts.nanos
+    assert_equal time, ts.to_time
   end
 
   def test_duration
diff --git a/ruby/travis-test.sh b/ruby/travis-test.sh
index 52ea81b6..cbe7cd98 100755
--- a/ruby/travis-test.sh
+++ b/ruby/travis-test.sh
@@ -20,6 +20,7 @@ test_version() {
        git clean -f && \
        gem install bundler && bundle && \
        rake test &&
+       rake gc_test &&
        cd ../conformance && make test_ruby &&
        cd ../ruby/compatibility_tests/v3.0.0 && ./test.sh"
   fi
diff --git a/src/Makefile.am b/src/Makefile.am
index 8c25a10a..b8648049 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -37,17 +37,17 @@ protodir = $(includedir)
 # If you are adding new files here, also remember to change the build files for
 # all other languages, //protoc-artifacts/build-zip.sh and run
 # //update_file_list.sh for bazel.
-nobase_dist_proto_DATA = google/protobuf/descriptor.proto     \
-                         google/protobuf/any.proto            \
-                         google/protobuf/api.proto            \
-                         google/protobuf/duration.proto       \
-                         google/protobuf/empty.proto          \
-                         google/protobuf/field_mask.proto     \
-                         google/protobuf/source_context.proto \
-                         google/protobuf/struct.proto         \
-                         google/protobuf/timestamp.proto      \
-                         google/protobuf/type.proto           \
-                         google/protobuf/wrappers.proto       \
+nobase_dist_proto_DATA = google/protobuf/descriptor.proto      \
+                         google/protobuf/any.proto             \
+                         google/protobuf/api.proto             \
+                         google/protobuf/duration.proto        \
+                         google/protobuf/empty.proto           \
+                         google/protobuf/field_mask.proto      \
+                         google/protobuf/source_context.proto  \
+                         google/protobuf/struct.proto          \
+                         google/protobuf/timestamp.proto       \
+                         google/protobuf/type.proto            \
+                         google/protobuf/wrappers.proto        \
                          google/protobuf/compiler/plugin.proto
 
 # Not sure why these don't get cleaned automatically.
@@ -56,29 +56,12 @@ clean-local:
 
 CLEANFILES = $(protoc_outputs) unittest_proto_middleman \
              testzip.jar testzip.list testzip.proto testzip.zip \
-             no_warning_test.cc \
-             google/protobuf/compiler/js/well_known_types_embed.cc \
-             js_embed$(EXEEXT)
+             no_warning_test.cc
 
 MAINTAINERCLEANFILES =   \
   Makefile.in
 
 nobase_include_HEADERS =                                         \
-  google/protobuf/stubs/atomic_sequence_num.h                    \
-  google/protobuf/stubs/atomicops.h                              \
-  google/protobuf/stubs/atomicops_internals_power.h              \
-  google/protobuf/stubs/atomicops_internals_ppc_gcc.h            \
-  google/protobuf/stubs/atomicops_internals_arm64_gcc.h          \
-  google/protobuf/stubs/atomicops_internals_arm_gcc.h            \
-  google/protobuf/stubs/atomicops_internals_arm_qnx.h            \
-  google/protobuf/stubs/atomicops_internals_atomicword_compat.h  \
-  google/protobuf/stubs/atomicops_internals_generic_c11_atomic.h \
-  google/protobuf/stubs/atomicops_internals_generic_gcc.h        \
-  google/protobuf/stubs/atomicops_internals_mips_gcc.h           \
-  google/protobuf/stubs/atomicops_internals_solaris.h            \
-  google/protobuf/stubs/atomicops_internals_tsan.h               \
-  google/protobuf/stubs/atomicops_internals_x86_gcc.h            \
-  google/protobuf/stubs/atomicops_internals_x86_msvc.h           \
   google/protobuf/stubs/callback.h                               \
   google/protobuf/stubs/bytestream.h                             \
   google/protobuf/stubs/casts.h                                  \
@@ -91,18 +74,16 @@ nobase_include_HEADERS =                                         \
   google/protobuf/stubs/once.h                                   \
   google/protobuf/stubs/platform_macros.h                        \
   google/protobuf/stubs/port.h                                   \
-  google/protobuf/stubs/scoped_ptr.h                             \
-  google/protobuf/stubs/shared_ptr.h                             \
   google/protobuf/stubs/singleton.h                              \
   google/protobuf/stubs/status.h                                 \
   google/protobuf/stubs/stl_util.h                               \
   google/protobuf/stubs/stringpiece.h                            \
   google/protobuf/stubs/template_util.h                          \
-  google/protobuf/stubs/type_traits.h                            \
   google/protobuf/any.pb.h                                       \
   google/protobuf/api.pb.h                                       \
   google/protobuf/any.h                                          \
   google/protobuf/arena.h                                        \
+  google/protobuf/arena_impl.h                                   \
   google/protobuf/arenastring.h                                  \
   google/protobuf/descriptor_database.h                          \
   google/protobuf/descriptor.h                                   \
@@ -115,8 +96,11 @@ nobase_include_HEADERS =                                         \
   google/protobuf/generated_enum_reflection.h                    \
   google/protobuf/generated_enum_util.h                          \
   google/protobuf/generated_message_reflection.h                 \
+  google/protobuf/generated_message_table_driven.h               \
   google/protobuf/generated_message_util.h                       \
   google/protobuf/has_bits.h                                     \
+  google/protobuf/implicit_weak_message.h                        \
+  google/protobuf/inlined_string_field.h                         \
   google/protobuf/map_entry.h                                    \
   google/protobuf/map_entry_lite.h                               \
   google/protobuf/map_field.h                                    \
@@ -127,6 +111,7 @@ nobase_include_HEADERS =                                         \
   google/protobuf/message.h                                      \
   google/protobuf/message_lite.h                                 \
   google/protobuf/metadata.h                                     \
+  google/protobuf/metadata_lite.h                                \
   google/protobuf/reflection.h                                   \
   google/protobuf/reflection_ops.h                               \
   google/protobuf/repeated_field.h                               \
@@ -160,7 +145,6 @@ nobase_include_HEADERS =                                         \
   google/protobuf/compiler/csharp/csharp_names.h                 \
   google/protobuf/compiler/java/java_generator.h                 \
   google/protobuf/compiler/java/java_names.h                     \
-  google/protobuf/compiler/javanano/javanano_generator.h         \
   google/protobuf/compiler/js/js_generator.h                     \
   google/protobuf/compiler/js/well_known_types_embed.h           \
   google/protobuf/compiler/objectivec/objectivec_generator.h     \
@@ -169,6 +153,7 @@ nobase_include_HEADERS =                                         \
   google/protobuf/compiler/python/python_generator.h             \
   google/protobuf/compiler/ruby/ruby_generator.h                 \
   google/protobuf/util/type_resolver.h                           \
+  google/protobuf/util/delimited_message_util.h                  \
   google/protobuf/util/field_comparator.h                        \
   google/protobuf/util/field_mask_util.h                         \
   google/protobuf/util/json_util.h                               \
@@ -179,20 +164,22 @@ nobase_include_HEADERS =                                         \
 lib_LTLIBRARIES = libprotobuf-lite.la libprotobuf.la libprotoc.la
 
 libprotobuf_lite_la_LIBADD = $(PTHREAD_LIBS)
-libprotobuf_lite_la_LDFLAGS = -version-info 12:0:0 -export-dynamic -no-undefined
+libprotobuf_lite_la_LDFLAGS = -version-info 15:1:0 -export-dynamic -no-undefined
+if HAVE_LD_VERSION_SCRIPT
+libprotobuf_lite_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libprotobuf-lite.map
+EXTRA_libprotobuf_lite_la_DEPENDENCIES = libprotobuf-lite.map
+endif
 libprotobuf_lite_la_SOURCES =                                  \
-  google/protobuf/stubs/atomicops_internals_x86_gcc.cc         \
-  google/protobuf/stubs/atomicops_internals_x86_msvc.cc        \
   google/protobuf/stubs/bytestream.cc                          \
   google/protobuf/stubs/bytestream.h                           \
   google/protobuf/stubs/common.cc                              \
   google/protobuf/stubs/hash.h                                 \
   google/protobuf/stubs/int128.cc                              \
   google/protobuf/stubs/int128.h                               \
+  google/protobuf/stubs/io_win32.cc                            \
+  google/protobuf/stubs/io_win32.h                             \
   google/protobuf/stubs/map_util.h                             \
   google/protobuf/stubs/mathutil.h                             \
-  google/protobuf/stubs/once.cc                                \
-  google/protobuf/stubs/shared_ptr.h                           \
   google/protobuf/stubs/status.cc                              \
   google/protobuf/stubs/status.h                               \
   google/protobuf/stubs/status_macros.h                        \
@@ -211,6 +198,9 @@ libprotobuf_lite_la_SOURCES =                                  \
   google/protobuf/arenastring.cc                               \
   google/protobuf/extension_set.cc                             \
   google/protobuf/generated_message_util.cc                    \
+  google/protobuf/generated_message_table_driven_lite.h        \
+  google/protobuf/generated_message_table_driven_lite.cc       \
+  google/protobuf/implicit_weak_message.cc                     \
   google/protobuf/message_lite.cc                              \
   google/protobuf/repeated_field.cc                            \
   google/protobuf/wire_format_lite.cc                          \
@@ -220,7 +210,11 @@ libprotobuf_lite_la_SOURCES =                                  \
   google/protobuf/io/zero_copy_stream_impl_lite.cc
 
 libprotobuf_la_LIBADD = $(PTHREAD_LIBS)
-libprotobuf_la_LDFLAGS = -version-info 12:0:0 -export-dynamic -no-undefined
+libprotobuf_la_LDFLAGS = -version-info 15:1:0 -export-dynamic -no-undefined
+if HAVE_LD_VERSION_SCRIPT
+libprotobuf_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libprotobuf.map
+EXTRA_libprotobuf_la_DEPENDENCIES = libprotobuf.map
+endif
 libprotobuf_la_SOURCES =                                       \
   $(libprotobuf_lite_la_SOURCES)                               \
   google/protobuf/any.pb.cc                                    \
@@ -237,6 +231,8 @@ libprotobuf_la_SOURCES =                                       \
   google/protobuf/extension_set_heavy.cc                       \
   google/protobuf/field_mask.pb.cc                             \
   google/protobuf/generated_message_reflection.cc              \
+  google/protobuf/generated_message_table_driven_lite.h        \
+  google/protobuf/generated_message_table_driven.cc            \
   google/protobuf/map_field.cc                                 \
   google/protobuf/message.cc                                   \
   google/protobuf/reflection_internal.h                        \
@@ -259,6 +255,7 @@ libprotobuf_la_SOURCES =                                       \
   google/protobuf/io/zero_copy_stream_impl.cc                  \
   google/protobuf/compiler/importer.cc                         \
   google/protobuf/compiler/parser.cc                           \
+  google/protobuf/util/delimited_message_util.cc               \
   google/protobuf/util/field_comparator.cc                     \
   google/protobuf/util/field_mask_util.cc                      \
   google/protobuf/util/internal/constants.h                    \
@@ -304,7 +301,11 @@ libprotobuf_la_SOURCES =                                       \
 nodist_libprotobuf_la_SOURCES = $(nodist_libprotobuf_lite_la_SOURCES)
 
 libprotoc_la_LIBADD = $(PTHREAD_LIBS) libprotobuf.la
-libprotoc_la_LDFLAGS = -version-info 12:0:0 -export-dynamic -no-undefined
+libprotoc_la_LDFLAGS = -version-info 15:1:0 -export-dynamic -no-undefined
+if HAVE_LD_VERSION_SCRIPT
+libprotoc_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libprotoc.map
+EXTRA_libprotoc_la_DEPENDENCIES = libprotoc.map
+endif
 libprotoc_la_SOURCES =                                         \
   google/protobuf/compiler/code_generator.cc                   \
   google/protobuf/compiler/command_line_interface.cc           \
@@ -333,7 +334,10 @@ libprotoc_la_SOURCES =                                         \
   google/protobuf/compiler/cpp/cpp_message.h                   \
   google/protobuf/compiler/cpp/cpp_message_field.cc            \
   google/protobuf/compiler/cpp/cpp_message_field.h             \
+  google/protobuf/compiler/cpp/cpp_message_layout_helper.h     \
   google/protobuf/compiler/cpp/cpp_options.h                   \
+  google/protobuf/compiler/cpp/cpp_padding_optimizer.cc        \
+  google/protobuf/compiler/cpp/cpp_padding_optimizer.h         \
   google/protobuf/compiler/cpp/cpp_primitive_field.cc          \
   google/protobuf/compiler/cpp/cpp_primitive_field.h           \
   google/protobuf/compiler/cpp/cpp_service.cc                  \
@@ -402,29 +406,6 @@ libprotoc_la_SOURCES =                                         \
   google/protobuf/compiler/java/java_doc_comment.h             \
   google/protobuf/compiler/js/js_generator.cc                  \
   google/protobuf/compiler/js/well_known_types_embed.cc        \
-  google/protobuf/compiler/javanano/javanano_enum.cc           \
-  google/protobuf/compiler/javanano/javanano_enum.h            \
-  google/protobuf/compiler/javanano/javanano_enum_field.cc     \
-  google/protobuf/compiler/javanano/javanano_enum_field.h      \
-  google/protobuf/compiler/javanano/javanano_extension.cc      \
-  google/protobuf/compiler/javanano/javanano_extension.h       \
-  google/protobuf/compiler/javanano/javanano_field.cc          \
-  google/protobuf/compiler/javanano/javanano_field.h           \
-  google/protobuf/compiler/javanano/javanano_file.cc           \
-  google/protobuf/compiler/javanano/javanano_file.h            \
-  google/protobuf/compiler/javanano/javanano_generator.cc      \
-  google/protobuf/compiler/javanano/javanano_generator.h       \
-  google/protobuf/compiler/javanano/javanano_helpers.cc        \
-  google/protobuf/compiler/javanano/javanano_helpers.h         \
-  google/protobuf/compiler/javanano/javanano_map_field.cc      \
-  google/protobuf/compiler/javanano/javanano_map_field.h       \
-  google/protobuf/compiler/javanano/javanano_message.cc        \
-  google/protobuf/compiler/javanano/javanano_message.h         \
-  google/protobuf/compiler/javanano/javanano_message_field.cc  \
-  google/protobuf/compiler/javanano/javanano_message_field.h   \
-  google/protobuf/compiler/javanano/javanano_params.h          \
-  google/protobuf/compiler/javanano/javanano_primitive_field.cc \
-  google/protobuf/compiler/javanano/javanano_primitive_field.h \
   google/protobuf/compiler/objectivec/objectivec_enum.cc       \
   google/protobuf/compiler/objectivec/objectivec_enum.h        \
   google/protobuf/compiler/objectivec/objectivec_enum_field.cc \
@@ -488,21 +469,6 @@ bin_PROGRAMS = protoc
 protoc_LDADD = $(PTHREAD_LIBS) libprotobuf.la libprotoc.la
 protoc_SOURCES = google/protobuf/compiler/main.cc
 
-# The special JS code for the well-known types is linked into the compiler via
-# well_known_types_embed.cc, which is generated from .js source files. We have
-# to build the js_embed binary using $(CXX_FOR_BUILD) so that it is executable
-# on the build machine in a cross-compilation setup.
-js_embed$(EXEEXT): $(srcdir)/google/protobuf/compiler/js/embed.cc
-	$(CXX_FOR_BUILD) -o $@ $<
-js_well_known_types_sources =                                  \
-	google/protobuf/compiler/js/well_known_types/any.js          \
-	google/protobuf/compiler/js/well_known_types/struct.js       \
-	google/protobuf/compiler/js/well_known_types/timestamp.js
-# We have to cd to $(srcdir) so that out-of-tree builds work properly.
-google/protobuf/compiler/js/well_known_types_embed.cc: js_embed$(EXEEXT) $(js_well_known_types_sources)
-	oldpwd=`pwd` && cd $(srcdir) && \
-	$$oldpwd/js_embed$(EXEEXT) $(js_well_known_types_sources) > $$oldpwd/$@
-
 # Tests ==============================================================
 
 protoc_inputs =                                                   \
@@ -521,6 +487,9 @@ protoc_inputs =                                                   \
   google/protobuf/unittest_import.proto                           \
   google/protobuf/unittest_import_public_lite.proto               \
   google/protobuf/unittest_import_public.proto                    \
+  google/protobuf/unittest_lazy_dependencies.proto                \
+  google/protobuf/unittest_lazy_dependencies_custom_option.proto  \
+  google/protobuf/unittest_lazy_dependencies_enum.proto           \
   google/protobuf/unittest_lite_imports_nonlite.proto             \
   google/protobuf/unittest_lite.proto                             \
   google/protobuf/unittest_mset.proto                             \
@@ -535,8 +504,8 @@ protoc_inputs =                                                   \
   google/protobuf/unittest_preserve_unknown_enum.proto            \
   google/protobuf/unittest.proto                                  \
   google/protobuf/unittest_proto3_arena.proto                     \
-  google/protobuf/unittest_proto3_arena_lite.proto                     \
-  google/protobuf/unittest_proto3_lite.proto                     \
+  google/protobuf/unittest_proto3_arena_lite.proto                \
+  google/protobuf/unittest_proto3_lite.proto                      \
   google/protobuf/unittest_well_known_types.proto                 \
   google/protobuf/util/internal/testdata/anys.proto               \
   google/protobuf/util/internal/testdata/books.proto              \
@@ -557,6 +526,9 @@ EXTRA_DIST =                                                   \
   $(protoc_inputs)                                             \
   $(js_well_known_types_sources)                               \
   solaris/libstdc++.la                                         \
+  google/protobuf/unittest_proto3.proto                        \
+  google/protobuf/test_messages_proto3.proto                   \
+  google/protobuf/test_messages_proto2.proto                   \
   google/protobuf/io/gzip_stream.h                             \
   google/protobuf/io/gzip_stream_unittest.sh                   \
   google/protobuf/testdata/golden_message                      \
@@ -575,11 +547,13 @@ EXTRA_DIST =                                                   \
   google/protobuf/package_info.h                               \
   google/protobuf/io/package_info.h                            \
   google/protobuf/util/package_info.h                          \
-  google/protobuf/compiler/js/embed.cc                         \
   google/protobuf/compiler/ruby/ruby_generated_code.proto      \
   google/protobuf/compiler/ruby/ruby_generated_code_pb.rb      \
   google/protobuf/compiler/package_info.h                      \
   google/protobuf/compiler/zip_output_unittest.sh              \
+  libprotobuf-lite.map                                         \
+  libprotobuf.map                                              \
+  libprotoc.map                                                \
   README.md
 
 protoc_lite_outputs =                                          \
@@ -622,6 +596,12 @@ protoc_outputs =                                                  \
   google/protobuf/unittest_import.pb.h                            \
   google/protobuf/unittest_import_public.pb.cc                    \
   google/protobuf/unittest_import_public.pb.h                     \
+  google/protobuf/unittest_lazy_dependencies.pb.cc                \
+  google/protobuf/unittest_lazy_dependencies.pb.h                 \
+  google/protobuf/unittest_lazy_dependencies_custom_option.pb.cc  \
+  google/protobuf/unittest_lazy_dependencies_custom_option.pb.h   \
+  google/protobuf/unittest_lazy_dependencies_enum.pb.cc           \
+  google/protobuf/unittest_lazy_dependencies_enum.pb.h            \
   google/protobuf/unittest_lite_imports_nonlite.pb.cc             \
   google/protobuf/unittest_lite_imports_nonlite.pb.h              \
   google/protobuf/unittest_mset.pb.cc                             \
@@ -646,10 +626,10 @@ protoc_outputs =                                                  \
   google/protobuf/unittest_preserve_unknown_enum.pb.h             \
   google/protobuf/unittest_proto3_arena.pb.cc                     \
   google/protobuf/unittest_proto3_arena.pb.h                      \
-  google/protobuf/unittest_proto3_arena_lite.pb.cc                     \
-  google/protobuf/unittest_proto3_arena_lite.pb.h                      \
-  google/protobuf/unittest_proto3_lite.pb.cc                     \
-  google/protobuf/unittest_proto3_lite.pb.h                      \
+  google/protobuf/unittest_proto3_arena_lite.pb.cc                \
+  google/protobuf/unittest_proto3_arena_lite.pb.h                 \
+  google/protobuf/unittest_proto3_lite.pb.cc                      \
+  google/protobuf/unittest_proto3_lite.pb.h                       \
   google/protobuf/unittest_well_known_types.pb.cc                 \
   google/protobuf/unittest_well_known_types.pb.h                  \
   google/protobuf/util/internal/testdata/anys.pb.cc               \
@@ -679,8 +659,6 @@ protoc_outputs =                                                  \
   google/protobuf/util/message_differencer_unittest.pb.cc         \
   google/protobuf/util/message_differencer_unittest.pb.h
 
-BUILT_SOURCES = $(protoc_outputs) google/protobuf/compiler/js/well_known_types_embed.cc
-
 if USE_EXTERNAL_PROTOC
 
 unittest_proto_middleman: $(protoc_inputs)
@@ -708,20 +686,25 @@ COMMON_TEST_SOURCES =                                          \
   google/protobuf/map_test_util_impl.h                         \
   google/protobuf/test_util.cc                                 \
   google/protobuf/test_util.h                                  \
+  google/protobuf/test_util.inc                                \
   google/protobuf/testing/googletest.cc                        \
   google/protobuf/testing/googletest.h                         \
   google/protobuf/testing/file.cc                              \
   google/protobuf/testing/file.h
 
+GOOGLETEST_BUILD_DIR=../third_party/googletest/googletest
+GOOGLEMOCK_BUILD_DIR=../third_party/googletest/googlemock
+GOOGLETEST_SRC_DIR=$(srcdir)/../third_party/googletest/googletest
+GOOGLEMOCK_SRC_DIR=$(srcdir)/../third_party/googletest/googlemock
 check_PROGRAMS = protoc protobuf-test protobuf-lazy-descriptor-test \
                  protobuf-lite-test test_plugin protobuf-lite-arena-test \
                  no-warning-test $(GZCHECKPROGRAMS)
 protobuf_test_LDADD = $(PTHREAD_LIBS) libprotobuf.la libprotoc.la \
-                      ../gmock/gtest/lib/libgtest.la              \
-                      ../gmock/lib/libgmock.la                    \
-                      ../gmock/lib/libgmock_main.la
-protobuf_test_CPPFLAGS = -I$(srcdir)/../gmock/gtest/include \
-                         -I$(srcdir)/../gmock/include
+                      $(GOOGLETEST_BUILD_DIR)/lib/libgtest.la     \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock.la     \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock_main.la
+protobuf_test_CPPFLAGS = -I$(GOOGLETEST_SRC_DIR)/include \
+                         -I$(GOOGLEMOCK_SRC_DIR)/include
 # Disable optimization for tests unless the user explicitly asked for it,
 # since test_util.cc takes forever to compile with optimization (with GCC).
 # See configure.ac for more info.
@@ -730,7 +713,7 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/stubs/bytestream_unittest.cc                 \
   google/protobuf/stubs/common_unittest.cc                     \
   google/protobuf/stubs/int128_unittest.cc                     \
-  google/protobuf/stubs/once_unittest.cc                       \
+  google/protobuf/stubs/io_win32_unittest.cc                   \
   google/protobuf/stubs/statusor_test.cc                       \
   google/protobuf/stubs/status_test.cc                         \
   google/protobuf/stubs/stringpiece_unittest.cc                \
@@ -739,7 +722,6 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/stubs/strutil_unittest.cc                    \
   google/protobuf/stubs/template_util_unittest.cc              \
   google/protobuf/stubs/time_test.cc                           \
-  google/protobuf/stubs/type_traits_unittest.cc                \
   google/protobuf/any_test.cc                                  \
   google/protobuf/arenastring_unittest.cc                      \
   google/protobuf/arena_unittest.cc                            \
@@ -752,11 +734,12 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/map_field_test.cc                            \
   google/protobuf/map_test.cc                                  \
   google/protobuf/message_unittest.cc                          \
+  google/protobuf/message_unittest.inc                         \
   google/protobuf/no_field_presence_test.cc                    \
   google/protobuf/preserve_unknown_enum_test.cc                \
+  google/protobuf/proto3_arena_lite_unittest.cc                \
   google/protobuf/proto3_arena_unittest.cc                     \
-  google/protobuf/proto3_arena_lite_unittest.cc                     \
-  google/protobuf/proto3_lite_unittest.cc                     \
+  google/protobuf/proto3_lite_unittest.cc                      \
   google/protobuf/reflection_ops_unittest.cc                   \
   google/protobuf/repeated_field_reflection_unittest.cc        \
   google/protobuf/repeated_field_unittest.cc                   \
@@ -768,14 +751,18 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/io/printer_unittest.cc                       \
   google/protobuf/io/tokenizer_unittest.cc                     \
   google/protobuf/io/zero_copy_stream_unittest.cc              \
+  google/protobuf/compiler/annotation_test_util.h              \
+  google/protobuf/compiler/annotation_test_util.cc             \
   google/protobuf/compiler/command_line_interface_unittest.cc  \
   google/protobuf/compiler/importer_unittest.cc                \
   google/protobuf/compiler/mock_code_generator.cc              \
   google/protobuf/compiler/mock_code_generator.h               \
   google/protobuf/compiler/parser_unittest.cc                  \
   google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc       \
+  google/protobuf/compiler/cpp/cpp_move_unittest.cc            \
   google/protobuf/compiler/cpp/cpp_unittest.h                  \
   google/protobuf/compiler/cpp/cpp_unittest.cc                 \
+  google/protobuf/compiler/cpp/cpp_unittest.inc                \
   google/protobuf/compiler/cpp/cpp_plugin_unittest.cc          \
   google/protobuf/compiler/cpp/metadata_test.cc                \
   google/protobuf/compiler/java/java_plugin_unittest.cc        \
@@ -785,6 +772,7 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/compiler/ruby/ruby_generator_unittest.cc     \
   google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc \
   google/protobuf/compiler/csharp/csharp_generator_unittest.cc \
+  google/protobuf/util/delimited_message_util_test.cc          \
   google/protobuf/util/field_comparator_test.cc                \
   google/protobuf/util/field_mask_util_test.cc                 \
   google/protobuf/util/internal/default_value_objectwriter_test.cc \
@@ -798,24 +786,24 @@ protobuf_test_SOURCES =                                        \
   google/protobuf/util/time_util_test.cc                       \
   google/protobuf/util/type_resolver_util_test.cc              \
   $(COMMON_TEST_SOURCES)
-
-
 nodist_protobuf_test_SOURCES = $(protoc_outputs)
+$(am_protobuf_test_OBJECTS): unittest_proto_middleman
 
 # Run cpp_unittest again with PROTOBUF_TEST_NO_DESCRIPTORS defined.
 protobuf_lazy_descriptor_test_LDADD = $(PTHREAD_LIBS) libprotobuf.la \
                       libprotoc.la                                   \
-                      ../gmock/gtest/lib/libgtest.la                 \
-                      ../gmock/lib/libgmock.la                       \
-                      ../gmock/lib/libgmock_main.la
-protobuf_lazy_descriptor_test_CPPFLAGS = -I$(srcdir)/../gmock/include       \
-                                         -I$(srcdir)/../gmock/gtest/include \
+                      $(GOOGLETEST_BUILD_DIR)/lib/libgtest.la        \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock.la        \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock_main.la
+protobuf_lazy_descriptor_test_CPPFLAGS = -I$(GOOGLEMOCK_SRC_DIR)/include \
+                                         -I$(GOOGLETEST_SRC_DIR)/include \
                                          -DPROTOBUF_TEST_NO_DESCRIPTORS
 protobuf_lazy_descriptor_test_CXXFLAGS = $(NO_OPT_CXXFLAGS)
 protobuf_lazy_descriptor_test_SOURCES =                        \
   google/protobuf/compiler/cpp/cpp_unittest.cc                 \
   $(COMMON_TEST_SOURCES)
 nodist_protobuf_lazy_descriptor_test_SOURCES = $(protoc_outputs)
+$(am_protobuf_lazy_descriptor_test_OBJECTS): unittest_proto_middleman
 
 COMMON_LITE_TEST_SOURCES =                                             \
   google/protobuf/arena_test_util.cc                                   \
@@ -829,32 +817,39 @@ COMMON_LITE_TEST_SOURCES =                                             \
 # depend on gtest because our internal version of gtest depend on proto
 # full runtime and we want to make sure this test builds without full
 # runtime.
-protobuf_lite_test_LDADD = $(PTHREAD_LIBS) libprotobuf-lite.la
+protobuf_lite_test_LDADD = $(PTHREAD_LIBS) libprotobuf-lite.la     \
+                           $(GOOGLETEST_BUILD_DIR)/lib/libgtest.la \
+                           $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock.la \
+                           $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock_main.la
+protobuf_lite_test_CPPFLAGS= -I$(GOOGLEMOCK_SRC_DIR)/include \
+                             -I$(GOOGLETEST_SRC_DIR)/include
 protobuf_lite_test_CXXFLAGS = $(NO_OPT_CXXFLAGS)
 protobuf_lite_test_SOURCES =                                           \
   google/protobuf/lite_unittest.cc                                     \
   $(COMMON_LITE_TEST_SOURCES)
 nodist_protobuf_lite_test_SOURCES = $(protoc_lite_outputs)
+$(am_protobuf_lite_test_OBJECTS): unittest_proto_middleman
 
 # lite_arena_unittest depends on gtest because teboring@ found that without
 # gtest when building the test internally our memory sanitizer doesn't detect
 # memory leaks (don't know why).
 protobuf_lite_arena_test_LDADD = $(PTHREAD_LIBS) libprotobuf-lite.la \
-                      ../gmock/gtest/lib/libgtest.la                 \
-                      ../gmock/lib/libgmock.la                       \
-                      ../gmock/lib/libgmock_main.la
-protobuf_lite_arena_test_CPPFLAGS = -I$(srcdir)/../gmock/include       \
-                                    -I$(srcdir)/../gmock/gtest/include
+                      $(GOOGLETEST_BUILD_DIR)/lib/libgtest.la        \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock.la        \
+                      $(GOOGLEMOCK_BUILD_DIR)/lib/libgmock_main.la
+protobuf_lite_arena_test_CPPFLAGS = -I$(GOOGLEMOCK_SRC_DIR)/include  \
+                                    -I$(GOOGLETEST_SRC_DIR)/include
 protobuf_lite_arena_test_CXXFLAGS = $(NO_OPT_CXXFLAGS)
 protobuf_lite_arena_test_SOURCES =       \
   google/protobuf/lite_arena_unittest.cc \
   $(COMMON_LITE_TEST_SOURCES)
 nodist_protobuf_lite_arena_test_SOURCES = $(protoc_lite_outputs)
+$(am_protobuf_lite_arena_test_OBJECTS): unittest_proto_middleman
 
 # Test plugin binary.
 test_plugin_LDADD = $(PTHREAD_LIBS) libprotobuf.la libprotoc.la \
-                    ../gmock/gtest/lib/libgtest.la
-test_plugin_CPPFLAGS = -I$(srcdir)/../gmock/gtest/include
+                    $(GOOGLETEST_BUILD_DIR)/lib/libgtest.la
+test_plugin_CPPFLAGS = -I$(GOOGLETEST_SRC_DIR)/include
 test_plugin_SOURCES =                                          \
   google/protobuf/compiler/mock_code_generator.cc              \
   google/protobuf/testing/file.cc                              \
@@ -875,19 +870,13 @@ endif
 no_warning_test.cc:
 	echo "// Generated from Makefile.am" > no_warning_test.cc
 	for FILE in $(nobase_include_HEADERS); do \
-	  if ! echo $${FILE} | grep "atomicops"; then \
-	    echo "#include <$${FILE}>" >> no_warning_test.cc; \
-	  fi \
+    echo "#include <$${FILE}>" >> no_warning_test.cc; \
 	done
-	echo "#include <gtest/gtest.h>" >> no_warning_test.cc
-	echo "TEST(NoWarningTest, Empty) {}" >> no_warning_test.cc
+	echo "int main(int, char**) { return 0; }" >> no_warning_test.cc
 
-no_warning_test_LDADD = $(PTHREAD_LIBS) libprotobuf.la      \
-                        ../gmock/gtest/lib/libgtest.la      \
-                        ../gmock/gtest/lib/libgtest_main.la
-no_warning_test_CPPFLAGS = -I$(srcdir)/../gmock/gtest/include
+no_warning_test_LDADD = $(PTHREAD_LIBS) libprotobuf.la libprotoc.la
 no_warning_test_CXXFLAGS = $(PTHREAD_CFLAGS) $(PTHREAD_DEF) $(ZLIB_DEF) \
-                           -Wall -Werror
+                           -Wall -Wextra -Werror -Wno-unused-parameter
 nodist_no_warning_test_SOURCES = no_warning_test.cc $(protoc_outputs)
 
 TESTS = protobuf-test protobuf-lazy-descriptor-test protobuf-lite-test \
diff --git a/src/README.md b/src/README.md
index c9362ee2..3cbeb3e6 100644
--- a/src/README.md
+++ b/src/README.md
@@ -15,29 +15,35 @@ To build protobuf from source, the following tools are needed:
   * autoconf
   * automake
   * libtool
-  * curl (used to download gmock)
   * make
   * g++
   * unzip
 
-On Ubuntu, you can install them with:
+On Ubuntu/Debian, you can install them with:
 
     $ sudo apt-get install autoconf automake libtool curl make g++ unzip
 
 On other platforms, please use the corresponding package managing tool to
 install them before proceeding.
 
-If you get the source from github, you need to generate the configure script
-first:
+To get the source, download one of the release .tar.gz or .zip packages in the
+release page:
 
-    $ ./autogen.sh
+    https://github.com/google/protobuf/releases/latest
+
+For example: if you only need C++, download `protobuf-cpp-[VERSION].tar.gz`; if
+you need C++ and Java, download `protobuf-java-[VERSION].tar.gz` (every package
+contains C++ source already); if you need C++ and multiple other languages,
+download `protobuf-all-[VERSION].tar.gz`.
 
-This will download gmock source (which is used for C++ Protocol Buffer
-unit-tests) to the current directory and run automake, autoconf, etc.
-to generate the configure script and various template makefiles.
+You can also get the source by "git clone" our git repository. Make sure you
+have also cloned the submodules and generated the configure script (skip this
+if you are using a release .tar.gz or .zip package):
 
-You can skip this step if you are using a release package (which already
-contains gmock and the configure script).
+    $ git clone https://github.com/google/protobuf.git
+    $ cd protobuf
+    $ git submodule update --init --recursive
+    $ ./autogen.sh
 
 To build and install the C++ Protocol Buffer runtime and the Protocol
 Buffer compiler (protoc) execute the following:
@@ -55,122 +61,122 @@ Proceed at your own risk.
 For advanced usage information on configure and make, please refer to the
 autoconf documentation:
 
-  http://www.gnu.org/software/autoconf/manual/autoconf.html#Running-configure-Scripts
+    http://www.gnu.org/software/autoconf/manual/autoconf.html#Running-configure-Scripts
 
 **Hint on install location**
 
-  By default, the package will be installed to /usr/local.  However,
-  on many platforms, /usr/local/lib is not part of LD_LIBRARY_PATH.
-  You can add it, but it may be easier to just install to /usr
-  instead.  To do this, invoke configure as follows:
+By default, the package will be installed to /usr/local.  However,
+on many platforms, /usr/local/lib is not part of LD_LIBRARY_PATH.
+You can add it, but it may be easier to just install to /usr
+instead.  To do this, invoke configure as follows:
 
     ./configure --prefix=/usr
 
-  If you already built the package with a different prefix, make sure
-  to run "make clean" before building again.
+If you already built the package with a different prefix, make sure
+to run "make clean" before building again.
 
 **Compiling dependent packages**
 
-  To compile a package that uses Protocol Buffers, you need to pass
-  various flags to your compiler and linker.  As of version 2.2.0,
-  Protocol Buffers integrates with pkg-config to manage this.  If you
-  have pkg-config installed, then you can invoke it to get a list of
-  flags like so:
+To compile a package that uses Protocol Buffers, you need to pass
+various flags to your compiler and linker.  As of version 2.2.0,
+Protocol Buffers integrates with pkg-config to manage this.  If you
+have pkg-config installed, then you can invoke it to get a list of
+flags like so:
 
     pkg-config --cflags protobuf         # print compiler flags
     pkg-config --libs protobuf           # print linker flags
     pkg-config --cflags --libs protobuf  # print both
 
-  For example:
+For example:
 
     c++ my_program.cc my_proto.pb.cc `pkg-config --cflags --libs protobuf`
 
-  Note that packages written prior to the 2.2.0 release of Protocol
-  Buffers may not yet integrate with pkg-config to get flags, and may
-  not pass the correct set of flags to correctly link against
-  libprotobuf.  If the package in question uses autoconf, you can
-  often fix the problem by invoking its configure script like:
+Note that packages written prior to the 2.2.0 release of Protocol
+Buffers may not yet integrate with pkg-config to get flags, and may
+not pass the correct set of flags to correctly link against
+libprotobuf.  If the package in question uses autoconf, you can
+often fix the problem by invoking its configure script like:
 
     configure CXXFLAGS="$(pkg-config --cflags protobuf)" \
               LIBS="$(pkg-config --libs protobuf)"
 
-  This will force it to use the correct flags.
+This will force it to use the correct flags.
 
-  If you are writing an autoconf-based package that uses Protocol
-  Buffers, you should probably use the PKG_CHECK_MODULES macro in your
-  configure script like:
+If you are writing an autoconf-based package that uses Protocol
+Buffers, you should probably use the PKG_CHECK_MODULES macro in your
+configure script like:
 
     PKG_CHECK_MODULES([protobuf], [protobuf])
 
-  See the pkg-config man page for more info.
+See the pkg-config man page for more info.
 
-  If you only want protobuf-lite, substitute "protobuf-lite" in place
-  of "protobuf" in these examples.
+If you only want protobuf-lite, substitute "protobuf-lite" in place
+of "protobuf" in these examples.
 
 **Note for Mac users**
 
-  For a Mac system, Unix tools are not available by default. You will first need
-  to install Xcode from the Mac AppStore and then run the following command from
-  a terminal:
+For a Mac system, Unix tools are not available by default. You will first need
+to install Xcode from the Mac AppStore and then run the following command from
+a terminal:
 
     $ sudo xcode-select --install
 
-  To install Unix tools, you can install "port" following the instructions at
-  https://www.macports.org . This will reside in /opt/local/bin/port for most
-  Mac installations.
+To install Unix tools, you can install "port" following the instructions at
+https://www.macports.org . This will reside in /opt/local/bin/port for most
+Mac installations.
 
     $ sudo /opt/local/bin/port install autoconf automake libtool
 
-  Then follow the Unix instructions above.
+Then follow the Unix instructions above.
 
 **Note for cross-compiling**
 
-  The makefiles normally invoke the protoc executable that they just
-  built in order to build tests.  When cross-compiling, the protoc
-  executable may not be executable on the host machine.  In this case,
-  you must build a copy of protoc for the host machine first, then use
-  the --with-protoc option to tell configure to use it instead.  For
-  example:
+The makefiles normally invoke the protoc executable that they just
+built in order to build tests.  When cross-compiling, the protoc
+executable may not be executable on the host machine.  In this case,
+you must build a copy of protoc for the host machine first, then use
+the --with-protoc option to tell configure to use it instead.  For
+example:
 
     ./configure --with-protoc=protoc
 
-  This will use the installed protoc (found in your $PATH) instead of
-  trying to execute the one built during the build process.  You can
-  also use an executable that hasn't been installed.  For example, if
-  you built the protobuf package for your host machine in ../host,
-  you might do:
+This will use the installed protoc (found in your $PATH) instead of
+trying to execute the one built during the build process.  You can
+also use an executable that hasn't been installed.  For example, if
+you built the protobuf package for your host machine in ../host,
+you might do:
 
     ./configure --with-protoc=../host/src/protoc
 
-  Either way, you must make sure that the protoc executable you use
-  has the same version as the protobuf source code you are trying to
-  use it with.
+Either way, you must make sure that the protoc executable you use
+has the same version as the protobuf source code you are trying to
+use it with.
 
 **Note for Solaris users**
 
-  Solaris 10 x86 has a bug that will make linking fail, complaining
-  about libstdc++.la being invalid.  We have included a work-around
-  in this package.  To use the work-around, run configure as follows:
+Solaris 10 x86 has a bug that will make linking fail, complaining
+about libstdc++.la being invalid.  We have included a work-around
+in this package.  To use the work-around, run configure as follows:
 
     ./configure LDFLAGS=-L$PWD/src/solaris
 
-  See src/solaris/libstdc++.la for more info on this bug.
+See src/solaris/libstdc++.la for more info on this bug.
 
 **Note for HP C++ Tru64 users**
 
-  To compile invoke configure as follows:
+To compile invoke configure as follows:
 
     ./configure CXXFLAGS="-O -std ansi -ieee -D__USE_STD_IOSTREAM"
 
-  Also, you will need to use gmake instead of make.
+Also, you will need to use gmake instead of make.
 
 **Note for AIX users**
 
-  Compile using the IBM xlC C++ compiler as follows:
+Compile using the IBM xlC C++ compiler as follows:
 
     ./configure CXX=xlC
 
-  Also, you will need to use GNU `make` (`gmake`) instead of AIX `make`.
+Also, you will need to use GNU `make` (`gmake`) instead of AIX `make`.
 
 C++ Installation - Windows
 --------------------------
@@ -178,12 +184,22 @@ C++ Installation - Windows
 If you only need the protoc binary, you can download it from the release
 page:
 
-  https://github.com/google/protobuf/releases
+    https://github.com/google/protobuf/releases/latest
 
 In the downloads section, download the zip file protoc-$VERSION-win32.zip.
 It contains the protoc binary as well as public proto files of protobuf
 library.
 
+Protobuf and its dependencies can be installed directly by using `vcpkg`:
+
+    >vcpkg install protobuf protobuf:x64-windows
+
+If zlib support is desired, you'll also need to install the zlib feature:
+
+    >vcpkg install protobuf[zlib] protobuf[zlib]:x64-windows
+
+See https://github.com/Microsoft/vcpkg for more information.
+
 To build from source using Microsoft Visual C++, see [cmake/README.md](../cmake/README.md).
 
 To build from source using Cygwin or MinGW, follow the Unix installation
diff --git a/src/google/protobuf/any.cc b/src/google/protobuf/any.cc
index 83edba57..b94529e6 100644
--- a/src/google/protobuf/any.cc
+++ b/src/google/protobuf/any.cc
@@ -32,6 +32,7 @@
 
 #include <google/protobuf/generated_message_util.h>
 
+
 namespace google {
 namespace protobuf {
 namespace internal {
@@ -84,15 +85,23 @@ bool AnyMetadata::InternalIs(const Descriptor* descriptor) const {
   return full_name == descriptor->full_name();
 }
 
-bool ParseAnyTypeUrl(const string& type_url, string* full_type_name) {
+bool ParseAnyTypeUrl(const string& type_url, string* url_prefix,
+                     string* full_type_name) {
   size_t pos = type_url.find_last_of("/");
   if (pos == string::npos || pos + 1 == type_url.size()) {
     return false;
   }
+  if (url_prefix) {
+    *url_prefix = type_url.substr(0, pos + 1);
+  }
   *full_type_name = type_url.substr(pos + 1);
   return true;
 }
 
+bool ParseAnyTypeUrl(const string& type_url, string* full_type_name) {
+  return ParseAnyTypeUrl(type_url, NULL, full_type_name);
+}
+
 
 bool GetAnyFieldDescriptors(const Message& message,
                             const FieldDescriptor** type_url_field,
diff --git a/src/google/protobuf/any.h b/src/google/protobuf/any.h
index 04e54166..a34e5f8e 100644
--- a/src/google/protobuf/any.h
+++ b/src/google/protobuf/any.h
@@ -63,7 +63,7 @@ class LIBPROTOBUF_EXPORT AnyMetadata {
 
   // Unpacks the payload into the given message. Returns false if the message's
   // type doesn't match the type specified in the type URL (i.e., the full
-  // name after the last "/" of the type URL doesn't match the message's actaul
+  // name after the last "/" of the type URL doesn't match the message's actual
   // full name) or parsing the payload has failed.
   bool UnpackTo(Message* message) const;
 
@@ -90,10 +90,21 @@ extern const char kTypeGoogleProdComPrefix[];  // "type.googleprod.com/".
 
 // Get the proto type name from Any::type_url value. For example, passing
 // "type.googleapis.com/rpc.QueryOrigin" will return "rpc.QueryOrigin" in
-// *full_type_name. Returns false if type_url does not start with
-// "type.googleapis.com" or "type.googleprod.com".
+// *full_type_name. Returns false if the type_url does not have a "/"
+// in the type url separating the full type name.
+//
+// NOTE: this function is available publicly as:
+//   google::protobuf::Any()  // static method on the generated message type.
 bool ParseAnyTypeUrl(const string& type_url, string* full_type_name);
 
+// Get the proto type name and prefix from Any::type_url value. For example,
+// passing "type.googleapis.com/rpc.QueryOrigin" will return
+// "type.googleapis.com/" in *url_prefix and "rpc.QueryOrigin" in
+// *full_type_name. Returns false if the type_url does not have a "/" in the
+// type url separating the full type name.
+bool ParseAnyTypeUrl(const string& type_url, string* url_prefix,
+                     string* full_type_name);
+
 // See if message is of type google.protobuf.Any, if so, return the descriptors
 // for "type_url" and "value" fields.
 bool GetAnyFieldDescriptors(const Message& message,
diff --git a/src/google/protobuf/any.pb.cc b/src/google/protobuf/any.pb.cc
index 94c9539f..9d632efe 100644
--- a/src/google/protobuf/any.pb.cc
+++ b/src/google/protobuf/any.pb.cc
@@ -1,95 +1,92 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/any.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class AnyDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Any> {
+class AnyDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Any>
+      _instance;
 } _Any_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fany_2eproto {
+static void InitDefaultsAny() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_Any_default_instance_;
+    new (ptr) ::google::protobuf::Any();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Any::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Any =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsAny}, {}};
 
-::google::protobuf::Metadata file_level_metadata[1];
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Any.base);
+}
 
-}  // namespace
+::google::protobuf::Metadata file_level_metadata[1];
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Any, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Any, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Any, type_url_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Any, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Any, type_url_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Any, value_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Any)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Any)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Any_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Any_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/any.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/any.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Any_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _Any_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\031google/protobuf/any.proto\022\017google.prot"
       "obuf\"&\n\003Any\022\020\n\010type_url\030\001 \001(\t\022\r\n\005value\030\002"
       " \001(\014Bo\n\023com.google.protobufB\010AnyProtoP\001Z"
@@ -101,25 +98,26 @@ void AddDescriptorsImpl() {
       descriptor, 205);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/any.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fany_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void Any::InitAsDefaultInstance() {
+}
 void Any::PackFrom(const ::google::protobuf::Message& message) {
   _any_metadata_.PackFrom(message);
 }
@@ -132,6 +130,11 @@ void Any::PackFrom(const ::google::protobuf::Message& message,
 bool Any::UnpackTo(::google::protobuf::Message* message) const {
   return _any_metadata_.UnpackTo(message);
 }
+bool Any::ParseAnyTypeUrl(const string& type_url,
+                                  string* full_type_name) {
+  return ::google::protobuf::internal::ParseAnyTypeUrl(type_url,
+                                             full_type_name);
+}
 
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Any::kTypeUrlFieldNumber;
@@ -140,16 +143,14 @@ const int Any::kValueFieldNumber;
 
 Any::Any()
   : ::google::protobuf::Message(), _internal_metadata_(NULL), _any_metadata_(&type_url_, &value_) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fany_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fany_2eproto::scc_info_Any.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Any)
 }
 Any::Any(const Any& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _cached_size_(0),
       _any_metadata_(&type_url_, &value_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   type_url_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
@@ -166,7 +167,6 @@ Any::Any(const Any& from)
 void Any::SharedCtor() {
   type_url_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _cached_size_ = 0;
 }
 
 Any::~Any() {
@@ -180,32 +180,28 @@ void Any::SharedDtor() {
 }
 
 void Any::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Any::descriptor() {
-  protobuf_google_2fprotobuf_2fany_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fany_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fany_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fany_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Any& Any::default_instance() {
-  protobuf_google_2fprotobuf_2fany_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fany_2eproto::scc_info_Any.base);
   return *internal_default_instance();
 }
 
-Any* Any::New(::google::protobuf::Arena* arena) const {
-  Any* n = new Any;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void Any::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Any)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  _internal_metadata_.Clear();
 }
 
 bool Any::MergePartialFromCodedStream(
@@ -214,18 +210,18 @@ bool Any::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Any)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string type_url = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_type_url()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->type_url().data(), this->type_url().length(),
+            this->type_url().data(), static_cast<int>(this->type_url().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Any.type_url"));
         } else {
@@ -237,7 +233,7 @@ bool Any::MergePartialFromCodedStream(
       // bytes value = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadBytes(
                 input, this->mutable_value()));
         } else {
@@ -248,12 +244,11 @@ bool Any::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -270,10 +265,13 @@ failure:
 void Any::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Any)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string type_url = 1;
   if (this->type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->type_url().data(), this->type_url().length(),
+      this->type_url().data(), static_cast<int>(this->type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Any.type_url");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -286,17 +284,24 @@ void Any::SerializeWithCachedSizes(
       2, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Any)
 }
 
 ::google::protobuf::uint8* Any::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Any)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string type_url = 1;
   if (this->type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->type_url().data(), this->type_url().length(),
+      this->type_url().data(), static_cast<int>(this->type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Any.type_url");
     target =
@@ -311,6 +316,10 @@ void Any::SerializeWithCachedSizes(
         2, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Any)
   return target;
 }
@@ -319,6 +328,11 @@ size_t Any::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Any)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // string type_url = 1;
   if (this->type_url().size() > 0) {
     total_size += 1 +
@@ -334,9 +348,7 @@ size_t Any::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -359,6 +371,9 @@ void Any::MergeFrom(const Any& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Any)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.type_url().size() > 0) {
 
     type_url_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.type_url_);
@@ -392,127 +407,28 @@ void Any::Swap(Any* other) {
   InternalSwap(other);
 }
 void Any::InternalSwap(Any* other) {
-  type_url_.Swap(&other->type_url_);
-  value_.Swap(&other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  type_url_.Swap(&other->type_url_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  value_.Swap(&other->value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Any::GetMetadata() const {
   protobuf_google_2fprotobuf_2fany_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fany_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fany_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Any
-
-// string type_url = 1;
-void Any::clear_type_url() {
-  type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Any::type_url() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Any.type_url)
-  return type_url_.GetNoArena();
-}
-void Any::set_type_url(const ::std::string& value) {
-  
-  type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Any.type_url)
-}
-#if LANG_CXX11
-void Any::set_type_url(::std::string&& value) {
-  
-  type_url_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Any.type_url)
-}
-#endif
-void Any::set_type_url(const char* value) {
-  
-  type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Any.type_url)
-}
-void Any::set_type_url(const char* value, size_t size) {
-  
-  type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Any.type_url)
-}
-::std::string* Any::mutable_type_url() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Any.type_url)
-  return type_url_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Any::release_type_url() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Any.type_url)
-  
-  return type_url_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Any::set_allocated_type_url(::std::string* type_url) {
-  if (type_url != NULL) {
-    
-  } else {
-    
-  }
-  type_url_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), type_url);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Any.type_url)
-}
-
-// bytes value = 2;
-void Any::clear_value() {
-  value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Any::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Any.value)
-  return value_.GetNoArena();
-}
-void Any::set_value(const ::std::string& value) {
-  
-  value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Any.value)
-}
-#if LANG_CXX11
-void Any::set_value(::std::string&& value) {
-  
-  value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Any.value)
-}
-#endif
-void Any::set_value(const char* value) {
-  
-  value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Any.value)
-}
-void Any::set_value(const void* value, size_t size) {
-  
-  value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Any.value)
-}
-::std::string* Any::mutable_value() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Any.value)
-  return value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Any::release_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Any.value)
-  
-  return value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Any::set_allocated_value(::std::string* value) {
-  if (value != NULL) {
-    
-  } else {
-    
-  }
-  value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Any.value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Any* Arena::CreateMaybeMessage< ::google::protobuf::Any >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::Any >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/any.pb.h b/src/google/protobuf/any.pb.h
index 1a61d5af..bc537999 100644
--- a/src/google/protobuf/any.pb.h
+++ b/src/google/protobuf/any.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/any.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fany_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fany_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fany_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fany_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,7 +22,9 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
@@ -30,6 +32,20 @@
 #include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/any.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fany_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fany_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fany_2eproto
 namespace google {
 namespace protobuf {
 class Any;
@@ -37,20 +53,13 @@ class AnyDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern AnyDefaultTypeInternal _Any_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fany_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fany_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Any* Arena::CreateMaybeMessage<::google::protobuf::Any>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -65,14 +74,31 @@ class LIBPROTOBUF_EXPORT Any : public ::google::protobuf::Message /* @@protoc_in
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Any(Any&& from) noexcept
+    : Any() {
+    *this = ::std::move(from);
+  }
 
+  inline Any& operator=(Any&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const Any& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Any* internal_default_instance() {
     return reinterpret_cast<const Any*>(
                &_Any_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   // implements Any -----------------------------------------------
 
@@ -83,38 +109,43 @@ class LIBPROTOBUF_EXPORT Any : public ::google::protobuf::Message /* @@protoc_in
   template<typename T> bool Is() const {
     return _any_metadata_.Is<T>();
   }
+  static bool ParseAnyTypeUrl(const string& type_url,
+                              string* full_type_name);
 
   void Swap(Any* other);
+  friend void swap(Any& a, Any& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Any* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Any* New() const final {
+    return CreateMaybeMessage<Any>(NULL);
+  }
 
-  Any* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Any* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Any>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Any& from);
   void MergeFrom(const Any& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Any* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -125,7 +156,7 @@ class LIBPROTOBUF_EXPORT Any : public ::google::protobuf::Message /* @@protoc_in
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -165,16 +196,19 @@ class LIBPROTOBUF_EXPORT Any : public ::google::protobuf::Message /* @@protoc_in
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::ArenaStringPtr type_url_;
   ::google::protobuf::internal::ArenaStringPtr value_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::AnyMetadata _any_metadata_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fany_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fany_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Any
 
 // string type_url = 1;
@@ -199,6 +233,7 @@ inline void Any::set_type_url(::std::string&& value) {
 }
 #endif
 inline void Any::set_type_url(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Any.type_url)
@@ -251,6 +286,7 @@ inline void Any::set_value(::std::string&& value) {
 }
 #endif
 inline void Any::set_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Any.value)
@@ -281,14 +317,15 @@ inline void Any::set_allocated_value(::std::string* value) {
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Any.value)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fany_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fany_2eproto
diff --git a/src/google/protobuf/any.proto b/src/google/protobuf/any.proto
index 9bd3f50a..49329425 100644
--- a/src/google/protobuf/any.proto
+++ b/src/google/protobuf/any.proto
@@ -74,6 +74,16 @@ option objc_class_prefix = "GPB";
 //       any.Unpack(foo)
 //       ...
 //
+//  Example 4: Pack and unpack a message in Go
+//
+//      foo := &pb.Foo{...}
+//      any, err := ptypes.MarshalAny(foo)
+//      ...
+//      foo := &pb.Foo{}
+//      if err := ptypes.UnmarshalAny(any, foo); err != nil {
+//        ...
+//      }
+//
 // The pack methods provided by protobuf library will by default use
 // 'type.googleapis.com/full.type.name' as the type URL and the unpack
 // methods only use the fully qualified type name after the last '/'
@@ -110,17 +120,18 @@ option objc_class_prefix = "GPB";
 //     }
 //
 message Any {
-  // A URL/resource name whose content describes the type of the
-  // serialized protocol buffer message.
+  // A URL/resource name that uniquely identifies the type of the serialized
+  // protocol buffer message. The last segment of the URL's path must represent
+  // the fully qualified name of the type (as in
+  // `path/google.protobuf.Duration`). The name should be in a canonical form
+  // (e.g., leading "." is not accepted).
   //
-  // For URLs which use the scheme `http`, `https`, or no scheme, the
-  // following restrictions and interpretations apply:
+  // In practice, teams usually precompile into the binary all types that they
+  // expect it to use in the context of Any. However, for URLs which use the
+  // scheme `http`, `https`, or no scheme, one can optionally set up a type
+  // server that maps type URLs to message definitions as follows:
   //
   // * If no scheme is provided, `https` is assumed.
-  // * The last segment of the URL's path must represent the fully
-  //   qualified name of the type (as in `path/google.protobuf.Duration`).
-  //   The name should be in a canonical form (e.g., leading "." is
-  //   not accepted).
   // * An HTTP GET on the URL must yield a [google.protobuf.Type][]
   //   value in binary format, or produce an error.
   // * Applications are allowed to cache lookup results based on the
@@ -129,6 +140,10 @@ message Any {
   //   on changes to types. (Use versioned type names to manage
   //   breaking changes.)
   //
+  // Note: this functionality is not currently available in the official
+  // protobuf release, and it is not used for type URLs beginning with
+  // type.googleapis.com.
+  //
   // Schemes other than `http`, `https` (or the empty scheme) might be
   // used with implementation specific semantics.
   //
diff --git a/src/google/protobuf/api.pb.cc b/src/google/protobuf/api.pb.cc
index 6518e518..e0a249d0 100644
--- a/src/google/protobuf/api.pb.cc
+++ b/src/google/protobuf/api.pb.cc
@@ -1,135 +1,175 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/api.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
+namespace protobuf_google_2fprotobuf_2fapi_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fapi_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_Mixin;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fapi_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_Method;
+}  // namespace protobuf_google_2fprotobuf_2fapi_2eproto
+namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_SourceContext;
+}  // namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto
+namespace protobuf_google_2fprotobuf_2ftype_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftype_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_Option;
+}  // namespace protobuf_google_2fprotobuf_2ftype_2eproto
 namespace google {
 namespace protobuf {
-class ApiDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Api> {
+class ApiDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Api>
+      _instance;
 } _Api_default_instance_;
-class MethodDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Method> {
+class MethodDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Method>
+      _instance;
 } _Method_default_instance_;
-class MixinDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Mixin> {
+class MixinDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Mixin>
+      _instance;
 } _Mixin_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fapi_2eproto {
+static void InitDefaultsApi() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_Api_default_instance_;
+    new (ptr) ::google::protobuf::Api();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Api::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<4> scc_info_Api =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 4, InitDefaultsApi}, {
+      &protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Method.base,
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,
+      &protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::scc_info_SourceContext.base,
+      &protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Mixin.base,}};
 
-::google::protobuf::Metadata file_level_metadata[3];
+static void InitDefaultsMethod() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Method_default_instance_;
+    new (ptr) ::google::protobuf::Method();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Method::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_Method =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsMethod}, {
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,}};
+
+static void InitDefaultsMixin() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Mixin_default_instance_;
+    new (ptr) ::google::protobuf::Mixin();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Mixin::InitAsDefaultInstance();
+}
 
-}  // namespace
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Mixin =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsMixin}, {}};
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Api.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Method.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Mixin.base);
+}
+
+::google::protobuf::Metadata file_level_metadata[3];
+
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, methods_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, version_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, source_context_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, mixins_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Api, syntax_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, methods_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, version_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, source_context_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, mixins_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Api, syntax_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, request_type_url_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, request_streaming_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, response_type_url_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, response_streaming_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Method, syntax_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, request_type_url_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, request_streaming_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, response_type_url_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, response_streaming_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Method, syntax_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Mixin, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Mixin, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Mixin, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Mixin, root_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Mixin, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Mixin, root_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Api)},
-  { 11, -1, sizeof(Method)},
-  { 22, -1, sizeof(Mixin)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Api)},
+  { 12, -1, sizeof(::google::protobuf::Method)},
+  { 24, -1, sizeof(::google::protobuf::Mixin)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Api_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Method_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Mixin_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Api_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Method_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Mixin_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/api.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/api.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 3);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Api_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-  _Method_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _Mixin_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  ::google::protobuf::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::InitDefaults();
-  ::google::protobuf::protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  _Api_default_instance_.DefaultConstruct();
-  _Method_default_instance_.DefaultConstruct();
-  _Mixin_default_instance_.DefaultConstruct();
-  _Api_default_instance_.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
-      ::google::protobuf::SourceContext::internal_default_instance());
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\031google/protobuf/api.proto\022\017google.prot"
       "obuf\032$google/protobuf/source_context.pro"
       "to\032\032google/protobuf/type.proto\"\201\002\n\003Api\022\014"
@@ -154,27 +194,39 @@ void AddDescriptorsImpl() {
       descriptor, 750);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/api.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::AddDescriptors();
-  ::google::protobuf::protobuf_google_2fprotobuf_2ftype_2eproto::AddDescriptors();
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
+  ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::AddDescriptors();
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::AddDescriptors();
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fapi_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void Api::InitAsDefaultInstance() {
+  ::google::protobuf::_Api_default_instance_._instance.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
+      ::google::protobuf::SourceContext::internal_default_instance());
+}
+void Api::clear_options() {
+  options_.Clear();
+}
+void Api::clear_source_context() {
+  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) {
+    delete source_context_;
+  }
+  source_context_ = NULL;
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Api::kNameFieldNumber;
 const int Api::kMethodsFieldNumber;
@@ -187,9 +239,8 @@ const int Api::kSyntaxFieldNumber;
 
 Api::Api()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Api.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Api)
 }
@@ -198,8 +249,7 @@ Api::Api(const Api& from)
       _internal_metadata_(NULL),
       methods_(from.methods_),
       options_(from.options_),
-      mixins_(from.mixins_),
-      _cached_size_(0) {
+      mixins_(from.mixins_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -221,9 +271,9 @@ Api::Api(const Api& from)
 void Api::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   version_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&source_context_, 0, reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&source_context_) + sizeof(syntax_));
-  _cached_size_ = 0;
+  ::memset(&source_context_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&syntax_) -
+      reinterpret_cast<char*>(&source_context_)) + sizeof(syntax_));
 }
 
 Api::~Api() {
@@ -234,36 +284,29 @@ Api::~Api() {
 void Api::SharedDtor() {
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   version_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete source_context_;
-  }
+  if (this != internal_default_instance()) delete source_context_;
 }
 
 void Api::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Api::descriptor() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Api& Api::default_instance() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Api.base);
   return *internal_default_instance();
 }
 
-Api* Api::New(::google::protobuf::Arena* arena) const {
-  Api* n = new Api;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void Api::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Api)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   methods_.Clear();
   options_.Clear();
   mixins_.Clear();
@@ -274,6 +317,7 @@ void Api::Clear() {
   }
   source_context_ = NULL;
   syntax_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool Api::MergePartialFromCodedStream(
@@ -282,18 +326,18 @@ bool Api::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Api)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Api.name"));
         } else {
@@ -305,39 +349,35 @@ bool Api::MergePartialFromCodedStream(
       // repeated .google.protobuf.Method methods = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_methods()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.Option options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // string version = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_version()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->version().data(), this->version().length(),
+            this->version().data(), static_cast<int>(this->version().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Api.version"));
         } else {
@@ -349,8 +389,8 @@ bool Api::MergePartialFromCodedStream(
       // .google.protobuf.SourceContext source_context = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(42u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_source_context()));
         } else {
           goto handle_unusual;
@@ -361,21 +401,19 @@ bool Api::MergePartialFromCodedStream(
       // repeated .google.protobuf.Mixin mixins = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_mixins()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // .google.protobuf.Syntax syntax = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(56u)) {
+            static_cast< ::google::protobuf::uint8>(56u /* 56 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -389,12 +427,11 @@ bool Api::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -411,10 +448,13 @@ failure:
 void Api::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Api)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Api.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -422,21 +462,27 @@ void Api::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Method methods = 2;
-  for (unsigned int i = 0, n = this->methods_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->methods_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->methods(i), output);
+      2,
+      this->methods(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, this->options(i), output);
+      3,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
   // string version = 4;
   if (this->version().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->version().data(), this->version().length(),
+      this->version().data(), static_cast<int>(this->version().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Api.version");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -446,13 +492,16 @@ void Api::SerializeWithCachedSizes(
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      5, *this->source_context_, output);
+      5, this->_internal_source_context(), output);
   }
 
   // repeated .google.protobuf.Mixin mixins = 6;
-  for (unsigned int i = 0, n = this->mixins_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->mixins_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      6, this->mixins(i), output);
+      6,
+      this->mixins(static_cast<int>(i)),
+      output);
   }
 
   // .google.protobuf.Syntax syntax = 7;
@@ -461,17 +510,24 @@ void Api::SerializeWithCachedSizes(
       7, this->syntax(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Api)
 }
 
 ::google::protobuf::uint8* Api::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Api)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Api.name");
     target =
@@ -480,23 +536,25 @@ void Api::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Method methods = 2;
-  for (unsigned int i = 0, n = this->methods_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->methods_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->methods(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->methods(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        3, this->options(static_cast<int>(i)), deterministic, target);
   }
 
   // string version = 4;
   if (this->version().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->version().data(), this->version().length(),
+      this->version().data(), static_cast<int>(this->version().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Api.version");
     target =
@@ -507,15 +565,16 @@ void Api::SerializeWithCachedSizes(
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        5, *this->source_context_, false, target);
+      InternalWriteMessageToArray(
+        5, this->_internal_source_context(), deterministic, target);
   }
 
   // repeated .google.protobuf.Mixin mixins = 6;
-  for (unsigned int i = 0, n = this->mixins_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->mixins_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        6, this->mixins(i), false, target);
+      InternalWriteMessageToArray(
+        6, this->mixins(static_cast<int>(i)), deterministic, target);
   }
 
   // .google.protobuf.Syntax syntax = 7;
@@ -524,6 +583,10 @@ void Api::SerializeWithCachedSizes(
       7, this->syntax(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Api)
   return target;
 }
@@ -532,36 +595,41 @@ size_t Api::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Api)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Method methods = 2;
   {
-    unsigned int count = this->methods_size();
+    unsigned int count = static_cast<unsigned int>(this->methods_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->methods(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->methods(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.Option options = 3;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.Mixin mixins = 6;
   {
-    unsigned int count = this->mixins_size();
+    unsigned int count = static_cast<unsigned int>(this->mixins_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->mixins(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->mixins(static_cast<int>(i)));
     }
   }
 
@@ -582,8 +650,8 @@ size_t Api::ByteSizeLong() const {
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     total_size += 1 +
-      ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-        *this->source_context_);
+      ::google::protobuf::internal::WireFormatLite::MessageSize(
+        *source_context_);
   }
 
   // .google.protobuf.Syntax syntax = 7;
@@ -593,9 +661,7 @@ size_t Api::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -618,6 +684,9 @@ void Api::MergeFrom(const Api& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Api)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   methods_.MergeFrom(from.methods_);
   options_.MergeFrom(from.options_);
   mixins_.MergeFrom(from.mixins_);
@@ -660,275 +729,32 @@ void Api::Swap(Api* other) {
   InternalSwap(other);
 }
 void Api::InternalSwap(Api* other) {
-  methods_.UnsafeArenaSwap(&other->methods_);
-  options_.UnsafeArenaSwap(&other->options_);
-  mixins_.UnsafeArenaSwap(&other->mixins_);
-  name_.Swap(&other->name_);
-  version_.Swap(&other->version_);
-  std::swap(source_context_, other->source_context_);
-  std::swap(syntax_, other->syntax_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&methods_)->InternalSwap(CastToBase(&other->methods_));
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  CastToBase(&mixins_)->InternalSwap(CastToBase(&other->mixins_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  version_.Swap(&other->version_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(source_context_, other->source_context_);
+  swap(syntax_, other->syntax_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Api::GetMetadata() const {
   protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Api
-
-// string name = 1;
-void Api::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Api::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.name)
-  return name_.GetNoArena();
-}
-void Api::set_name(const ::std::string& value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Api.name)
-}
-#if LANG_CXX11
-void Api::set_name(::std::string&& value) {
-  
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Api.name)
-}
-#endif
-void Api::set_name(const char* value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Api.name)
-}
-void Api::set_name(const char* value, size_t size) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Api.name)
-}
-::std::string* Api::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Api::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Api.name)
-  
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Api::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Api.name)
-}
 
-// repeated .google.protobuf.Method methods = 2;
-int Api::methods_size() const {
-  return methods_.size();
-}
-void Api::clear_methods() {
-  methods_.Clear();
-}
-const ::google::protobuf::Method& Api::methods(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.methods)
-  return methods_.Get(index);
-}
-::google::protobuf::Method* Api::mutable_methods(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.methods)
-  return methods_.Mutable(index);
-}
-::google::protobuf::Method* Api::add_methods() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.methods)
-  return methods_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >*
-Api::mutable_methods() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.methods)
-  return &methods_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >&
-Api::methods() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Api.methods)
-  return methods_;
-}
+// ===================================================================
 
-// repeated .google.protobuf.Option options = 3;
-int Api::options_size() const {
-  return options_.size();
+void Method::InitAsDefaultInstance() {
 }
-void Api::clear_options() {
+void Method::clear_options() {
   options_.Clear();
 }
-const ::google::protobuf::Option& Api::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* Api::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* Api::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-Api::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-Api::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Api.options)
-  return options_;
-}
-
-// string version = 4;
-void Api::clear_version() {
-  version_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Api::version() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.version)
-  return version_.GetNoArena();
-}
-void Api::set_version(const ::std::string& value) {
-  
-  version_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Api.version)
-}
-#if LANG_CXX11
-void Api::set_version(::std::string&& value) {
-  
-  version_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Api.version)
-}
-#endif
-void Api::set_version(const char* value) {
-  
-  version_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Api.version)
-}
-void Api::set_version(const char* value, size_t size) {
-  
-  version_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Api.version)
-}
-::std::string* Api::mutable_version() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.version)
-  return version_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Api::release_version() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Api.version)
-  
-  return version_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Api::set_allocated_version(::std::string* version) {
-  if (version != NULL) {
-    
-  } else {
-    
-  }
-  version_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), version);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Api.version)
-}
-
-// .google.protobuf.SourceContext source_context = 5;
-bool Api::has_source_context() const {
-  return this != internal_default_instance() && source_context_ != NULL;
-}
-void Api::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
-}
-const ::google::protobuf::SourceContext& Api::source_context() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
-}
-::google::protobuf::SourceContext* Api::mutable_source_context() {
-  
-  if (source_context_ == NULL) {
-    source_context_ = new ::google::protobuf::SourceContext;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.source_context)
-  return source_context_;
-}
-::google::protobuf::SourceContext* Api::release_source_context() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Api.source_context)
-  
-  ::google::protobuf::SourceContext* temp = source_context_;
-  source_context_ = NULL;
-  return temp;
-}
-void Api::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
-  delete source_context_;
-  source_context_ = source_context;
-  if (source_context) {
-    
-  } else {
-    
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Api.source_context)
-}
-
-// repeated .google.protobuf.Mixin mixins = 6;
-int Api::mixins_size() const {
-  return mixins_.size();
-}
-void Api::clear_mixins() {
-  mixins_.Clear();
-}
-const ::google::protobuf::Mixin& Api::mixins(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.mixins)
-  return mixins_.Get(index);
-}
-::google::protobuf::Mixin* Api::mutable_mixins(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.mixins)
-  return mixins_.Mutable(index);
-}
-::google::protobuf::Mixin* Api::add_mixins() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.mixins)
-  return mixins_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >*
-Api::mutable_mixins() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.mixins)
-  return &mixins_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >&
-Api::mixins() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Api.mixins)
-  return mixins_;
-}
-
-// .google.protobuf.Syntax syntax = 7;
-void Api::clear_syntax() {
-  syntax_ = 0;
-}
-::google::protobuf::Syntax Api::syntax() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.syntax)
-  return static_cast< ::google::protobuf::Syntax >(syntax_);
-}
-void Api::set_syntax(::google::protobuf::Syntax value) {
-  
-  syntax_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Api.syntax)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Method::kNameFieldNumber;
 const int Method::kRequestTypeUrlFieldNumber;
@@ -941,17 +767,15 @@ const int Method::kSyntaxFieldNumber;
 
 Method::Method()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Method.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Method)
 }
 Method::Method(const Method& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      options_(from.options_),
-      _cached_size_(0) {
+      options_(from.options_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -966,8 +790,8 @@ Method::Method(const Method& from)
     response_type_url_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.response_type_url_);
   }
   ::memcpy(&request_streaming_, &from.request_streaming_,
-    reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&request_streaming_) + sizeof(syntax_));
+    static_cast<size_t>(reinterpret_cast<char*>(&syntax_) -
+    reinterpret_cast<char*>(&request_streaming_)) + sizeof(syntax_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Method)
 }
 
@@ -975,9 +799,9 @@ void Method::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   request_type_url_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   response_type_url_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&request_streaming_, 0, reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&request_streaming_) + sizeof(syntax_));
-  _cached_size_ = 0;
+  ::memset(&request_streaming_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&syntax_) -
+      reinterpret_cast<char*>(&request_streaming_)) + sizeof(syntax_));
 }
 
 Method::~Method() {
@@ -992,36 +816,33 @@ void Method::SharedDtor() {
 }
 
 void Method::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Method::descriptor() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Method& Method::default_instance() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Method.base);
   return *internal_default_instance();
 }
 
-Method* Method::New(::google::protobuf::Arena* arena) const {
-  Method* n = new Method;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void Method::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Method)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   options_.Clear();
   name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   request_type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   response_type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&request_streaming_, 0, reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&request_streaming_) + sizeof(syntax_));
+  ::memset(&request_streaming_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&syntax_) -
+      reinterpret_cast<char*>(&request_streaming_)) + sizeof(syntax_));
+  _internal_metadata_.Clear();
 }
 
 bool Method::MergePartialFromCodedStream(
@@ -1030,18 +851,18 @@ bool Method::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Method)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Method.name"));
         } else {
@@ -1053,11 +874,11 @@ bool Method::MergePartialFromCodedStream(
       // string request_type_url = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_request_type_url()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->request_type_url().data(), this->request_type_url().length(),
+            this->request_type_url().data(), static_cast<int>(this->request_type_url().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Method.request_type_url"));
         } else {
@@ -1069,7 +890,7 @@ bool Method::MergePartialFromCodedStream(
       // bool request_streaming = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -1083,11 +904,11 @@ bool Method::MergePartialFromCodedStream(
       // string response_type_url = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_response_type_url()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->response_type_url().data(), this->response_type_url().length(),
+            this->response_type_url().data(), static_cast<int>(this->response_type_url().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Method.response_type_url"));
         } else {
@@ -1099,7 +920,7 @@ bool Method::MergePartialFromCodedStream(
       // bool response_streaming = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -1113,21 +934,19 @@ bool Method::MergePartialFromCodedStream(
       // repeated .google.protobuf.Option options = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // .google.protobuf.Syntax syntax = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(56u)) {
+            static_cast< ::google::protobuf::uint8>(56u /* 56 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -1141,12 +960,11 @@ bool Method::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1163,10 +981,13 @@ failure:
 void Method::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Method)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1176,7 +997,7 @@ void Method::SerializeWithCachedSizes(
   // string request_type_url = 2;
   if (this->request_type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->request_type_url().data(), this->request_type_url().length(),
+      this->request_type_url().data(), static_cast<int>(this->request_type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.request_type_url");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1191,7 +1012,7 @@ void Method::SerializeWithCachedSizes(
   // string response_type_url = 4;
   if (this->response_type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->response_type_url().data(), this->response_type_url().length(),
+      this->response_type_url().data(), static_cast<int>(this->response_type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.response_type_url");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1204,9 +1025,12 @@ void Method::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 6;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      6, this->options(i), output);
+      6,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
   // .google.protobuf.Syntax syntax = 7;
@@ -1215,17 +1039,24 @@ void Method::SerializeWithCachedSizes(
       7, this->syntax(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Method)
 }
 
 ::google::protobuf::uint8* Method::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Method)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.name");
     target =
@@ -1236,7 +1067,7 @@ void Method::SerializeWithCachedSizes(
   // string request_type_url = 2;
   if (this->request_type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->request_type_url().data(), this->request_type_url().length(),
+      this->request_type_url().data(), static_cast<int>(this->request_type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.request_type_url");
     target =
@@ -1252,7 +1083,7 @@ void Method::SerializeWithCachedSizes(
   // string response_type_url = 4;
   if (this->response_type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->response_type_url().data(), this->response_type_url().length(),
+      this->response_type_url().data(), static_cast<int>(this->response_type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Method.response_type_url");
     target =
@@ -1266,10 +1097,11 @@ void Method::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 6;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        6, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        6, this->options(static_cast<int>(i)), deterministic, target);
   }
 
   // .google.protobuf.Syntax syntax = 7;
@@ -1278,6 +1110,10 @@ void Method::SerializeWithCachedSizes(
       7, this->syntax(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Method)
   return target;
 }
@@ -1286,14 +1122,19 @@ size_t Method::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Method)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Option options = 6;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
@@ -1335,9 +1176,7 @@ size_t Method::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1360,6 +1199,9 @@ void Method::MergeFrom(const Method& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Method)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   options_.MergeFrom(from.options_);
   if (from.name().size() > 0) {
 
@@ -1407,256 +1249,30 @@ void Method::Swap(Method* other) {
   InternalSwap(other);
 }
 void Method::InternalSwap(Method* other) {
-  options_.UnsafeArenaSwap(&other->options_);
-  name_.Swap(&other->name_);
-  request_type_url_.Swap(&other->request_type_url_);
-  response_type_url_.Swap(&other->response_type_url_);
-  std::swap(request_streaming_, other->request_streaming_);
-  std::swap(response_streaming_, other->response_streaming_);
-  std::swap(syntax_, other->syntax_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  request_type_url_.Swap(&other->request_type_url_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  response_type_url_.Swap(&other->response_type_url_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(request_streaming_, other->request_streaming_);
+  swap(response_streaming_, other->response_streaming_);
+  swap(syntax_, other->syntax_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Method::GetMetadata() const {
   protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[1];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Method
-
-// string name = 1;
-void Method::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Method::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.name)
-  return name_.GetNoArena();
-}
-void Method::set_name(const ::std::string& value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.name)
-}
-#if LANG_CXX11
-void Method::set_name(::std::string&& value) {
-  
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Method.name)
-}
-#endif
-void Method::set_name(const char* value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Method.name)
-}
-void Method::set_name(const char* value, size_t size) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Method.name)
-}
-::std::string* Method::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Method.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Method::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Method.name)
-  
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Method::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Method.name)
-}
-
-// string request_type_url = 2;
-void Method::clear_request_type_url() {
-  request_type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Method::request_type_url() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.request_type_url)
-  return request_type_url_.GetNoArena();
-}
-void Method::set_request_type_url(const ::std::string& value) {
-  
-  request_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.request_type_url)
-}
-#if LANG_CXX11
-void Method::set_request_type_url(::std::string&& value) {
-  
-  request_type_url_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Method.request_type_url)
-}
-#endif
-void Method::set_request_type_url(const char* value) {
-  
-  request_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Method.request_type_url)
-}
-void Method::set_request_type_url(const char* value, size_t size) {
-  
-  request_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Method.request_type_url)
-}
-::std::string* Method::mutable_request_type_url() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Method.request_type_url)
-  return request_type_url_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Method::release_request_type_url() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Method.request_type_url)
-  
-  return request_type_url_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Method::set_allocated_request_type_url(::std::string* request_type_url) {
-  if (request_type_url != NULL) {
-    
-  } else {
-    
-  }
-  request_type_url_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), request_type_url);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Method.request_type_url)
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// bool request_streaming = 3;
-void Method::clear_request_streaming() {
-  request_streaming_ = false;
-}
-bool Method::request_streaming() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.request_streaming)
-  return request_streaming_;
-}
-void Method::set_request_streaming(bool value) {
-  
-  request_streaming_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.request_streaming)
-}
-
-// string response_type_url = 4;
-void Method::clear_response_type_url() {
-  response_type_url_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Method::response_type_url() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.response_type_url)
-  return response_type_url_.GetNoArena();
-}
-void Method::set_response_type_url(const ::std::string& value) {
-  
-  response_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.response_type_url)
-}
-#if LANG_CXX11
-void Method::set_response_type_url(::std::string&& value) {
-  
-  response_type_url_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Method.response_type_url)
-}
-#endif
-void Method::set_response_type_url(const char* value) {
-  
-  response_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Method.response_type_url)
-}
-void Method::set_response_type_url(const char* value, size_t size) {
-  
-  response_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Method.response_type_url)
-}
-::std::string* Method::mutable_response_type_url() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Method.response_type_url)
-  return response_type_url_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Method::release_response_type_url() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Method.response_type_url)
-  
-  return response_type_url_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Method::set_allocated_response_type_url(::std::string* response_type_url) {
-  if (response_type_url != NULL) {
-    
-  } else {
-    
-  }
-  response_type_url_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), response_type_url);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Method.response_type_url)
-}
-
-// bool response_streaming = 5;
-void Method::clear_response_streaming() {
-  response_streaming_ = false;
-}
-bool Method::response_streaming() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.response_streaming)
-  return response_streaming_;
-}
-void Method::set_response_streaming(bool value) {
-  
-  response_streaming_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.response_streaming)
-}
-
-// repeated .google.protobuf.Option options = 6;
-int Method::options_size() const {
-  return options_.size();
-}
-void Method::clear_options() {
-  options_.Clear();
-}
-const ::google::protobuf::Option& Method::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* Method::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Method.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* Method::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Method.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-Method::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Method.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-Method::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Method.options)
-  return options_;
-}
-
-// .google.protobuf.Syntax syntax = 7;
-void Method::clear_syntax() {
-  syntax_ = 0;
-}
-::google::protobuf::Syntax Method::syntax() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.syntax)
-  return static_cast< ::google::protobuf::Syntax >(syntax_);
-}
-void Method::set_syntax(::google::protobuf::Syntax value) {
-  
-  syntax_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Method.syntax)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void Mixin::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Mixin::kNameFieldNumber;
 const int Mixin::kRootFieldNumber;
@@ -1664,16 +1280,14 @@ const int Mixin::kRootFieldNumber;
 
 Mixin::Mixin()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Mixin.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Mixin)
 }
 Mixin::Mixin(const Mixin& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -1689,7 +1303,6 @@ Mixin::Mixin(const Mixin& from)
 void Mixin::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   root_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _cached_size_ = 0;
 }
 
 Mixin::~Mixin() {
@@ -1703,32 +1316,28 @@ void Mixin::SharedDtor() {
 }
 
 void Mixin::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Mixin::descriptor() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Mixin& Mixin::default_instance() {
-  protobuf_google_2fprotobuf_2fapi_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fapi_2eproto::scc_info_Mixin.base);
   return *internal_default_instance();
 }
 
-Mixin* Mixin::New(::google::protobuf::Arena* arena) const {
-  Mixin* n = new Mixin;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void Mixin::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Mixin)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   root_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  _internal_metadata_.Clear();
 }
 
 bool Mixin::MergePartialFromCodedStream(
@@ -1737,18 +1346,18 @@ bool Mixin::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Mixin)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Mixin.name"));
         } else {
@@ -1760,11 +1369,11 @@ bool Mixin::MergePartialFromCodedStream(
       // string root = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_root()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->root().data(), this->root().length(),
+            this->root().data(), static_cast<int>(this->root().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Mixin.root"));
         } else {
@@ -1775,12 +1384,11 @@ bool Mixin::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1797,10 +1405,13 @@ failure:
 void Mixin::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Mixin)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Mixin.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1810,24 +1421,31 @@ void Mixin::SerializeWithCachedSizes(
   // string root = 2;
   if (this->root().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->root().data(), this->root().length(),
+      this->root().data(), static_cast<int>(this->root().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Mixin.root");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
       2, this->root(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Mixin)
 }
 
 ::google::protobuf::uint8* Mixin::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Mixin)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Mixin.name");
     target =
@@ -1838,7 +1456,7 @@ void Mixin::SerializeWithCachedSizes(
   // string root = 2;
   if (this->root().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->root().data(), this->root().length(),
+      this->root().data(), static_cast<int>(this->root().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Mixin.root");
     target =
@@ -1846,6 +1464,10 @@ void Mixin::SerializeWithCachedSizes(
         2, this->root(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Mixin)
   return target;
 }
@@ -1854,6 +1476,11 @@ size_t Mixin::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Mixin)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // string name = 1;
   if (this->name().size() > 0) {
     total_size += 1 +
@@ -1869,9 +1496,7 @@ size_t Mixin::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1894,6 +1519,9 @@ void Mixin::MergeFrom(const Mixin& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Mixin)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.name().size() > 0) {
 
     name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
@@ -1927,127 +1555,34 @@ void Mixin::Swap(Mixin* other) {
   InternalSwap(other);
 }
 void Mixin::InternalSwap(Mixin* other) {
-  name_.Swap(&other->name_);
-  root_.Swap(&other->root_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  root_.Swap(&other->root_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Mixin::GetMetadata() const {
   protobuf_google_2fprotobuf_2fapi_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[2];
+  return ::protobuf_google_2fprotobuf_2fapi_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Mixin
 
-// string name = 1;
-void Mixin::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Mixin::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Mixin.name)
-  return name_.GetNoArena();
-}
-void Mixin::set_name(const ::std::string& value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Mixin.name)
-}
-#if LANG_CXX11
-void Mixin::set_name(::std::string&& value) {
-  
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Mixin.name)
-}
-#endif
-void Mixin::set_name(const char* value) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Mixin.name)
-}
-void Mixin::set_name(const char* value, size_t size) {
-  
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Mixin.name)
-}
-::std::string* Mixin::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Mixin.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Mixin::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Mixin.name)
-  
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Mixin::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Mixin.name)
-}
-
-// string root = 2;
-void Mixin::clear_root() {
-  root_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& Mixin::root() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Mixin.root)
-  return root_.GetNoArena();
-}
-void Mixin::set_root(const ::std::string& value) {
-  
-  root_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.Mixin.root)
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Api* Arena::CreateMaybeMessage< ::google::protobuf::Api >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::Api >(arena);
 }
-#if LANG_CXX11
-void Mixin::set_root(::std::string&& value) {
-  
-  root_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Mixin.root)
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Method* Arena::CreateMaybeMessage< ::google::protobuf::Method >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::Method >(arena);
 }
-#endif
-void Mixin::set_root(const char* value) {
-  
-  root_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Mixin.root)
-}
-void Mixin::set_root(const char* value, size_t size) {
-  
-  root_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Mixin.root)
-}
-::std::string* Mixin::mutable_root() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Mixin.root)
-  return root_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Mixin::release_root() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Mixin.root)
-  
-  return root_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Mixin::set_allocated_root(::std::string* root) {
-  if (root != NULL) {
-    
-  } else {
-    
-  }
-  root_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), root);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Mixin.root)
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Mixin* Arena::CreateMaybeMessage< ::google::protobuf::Mixin >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::Mixin >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/api.pb.h b/src/google/protobuf/api.pb.h
index 2eb571e6..5a720cce 100644
--- a/src/google/protobuf/api.pb.h
+++ b/src/google/protobuf/api.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/api.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fapi_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fapi_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fapi_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fapi_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,7 +22,9 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
@@ -31,51 +33,42 @@
 #include <google/protobuf/source_context.pb.h>
 #include <google/protobuf/type.pb.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fapi_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fapi_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[3];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fapi_2eproto
 namespace google {
 namespace protobuf {
 class Api;
 class ApiDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern ApiDefaultTypeInternal _Api_default_instance_;
-class Enum;
-class EnumDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern EnumDefaultTypeInternal _Enum_default_instance_;
-class EnumValue;
-class EnumValueDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern EnumValueDefaultTypeInternal _EnumValue_default_instance_;
-class Field;
-class FieldDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern FieldDefaultTypeInternal _Field_default_instance_;
 class Method;
 class MethodDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern MethodDefaultTypeInternal _Method_default_instance_;
 class Mixin;
 class MixinDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern MixinDefaultTypeInternal _Mixin_default_instance_;
-class Option;
-class OptionDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern OptionDefaultTypeInternal _Option_default_instance_;
-class SourceContext;
-class SourceContextDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern SourceContextDefaultTypeInternal _SourceContext_default_instance_;
-class Type;
-class TypeDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern TypeDefaultTypeInternal _Type_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fapi_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fapi_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Api* Arena::CreateMaybeMessage<::google::protobuf::Api>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Method* Arena::CreateMaybeMessage<::google::protobuf::Method>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Mixin* Arena::CreateMaybeMessage<::google::protobuf::Mixin>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -90,46 +83,66 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Api(Api&& from) noexcept
+    : Api() {
+    *this = ::std::move(from);
+  }
 
+  inline Api& operator=(Api&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const Api& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Api* internal_default_instance() {
     return reinterpret_cast<const Api*>(
                &_Api_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void Swap(Api* other);
+  friend void swap(Api& a, Api& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Api* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Api* New() const final {
+    return CreateMaybeMessage<Api>(NULL);
+  }
 
-  Api* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Api* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Api>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Api& from);
   void MergeFrom(const Api& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Api* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -140,7 +153,7 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -150,11 +163,11 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   int methods_size() const;
   void clear_methods();
   static const int kMethodsFieldNumber = 2;
-  const ::google::protobuf::Method& methods(int index) const;
   ::google::protobuf::Method* mutable_methods(int index);
-  ::google::protobuf::Method* add_methods();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >*
       mutable_methods();
+  const ::google::protobuf::Method& methods(int index) const;
+  ::google::protobuf::Method* add_methods();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >&
       methods() const;
 
@@ -162,11 +175,11 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -174,11 +187,11 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   int mixins_size() const;
   void clear_mixins();
   static const int kMixinsFieldNumber = 6;
-  const ::google::protobuf::Mixin& mixins(int index) const;
   ::google::protobuf::Mixin* mutable_mixins(int index);
-  ::google::protobuf::Mixin* add_mixins();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >*
       mutable_mixins();
+  const ::google::protobuf::Mixin& mixins(int index) const;
+  ::google::protobuf::Mixin* add_mixins();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >&
       mixins() const;
 
@@ -214,9 +227,12 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   bool has_source_context() const;
   void clear_source_context();
   static const int kSourceContextFieldNumber = 5;
+  private:
+  const ::google::protobuf::SourceContext& _internal_source_context() const;
+  public:
   const ::google::protobuf::SourceContext& source_context() const;
-  ::google::protobuf::SourceContext* mutable_source_context();
   ::google::protobuf::SourceContext* release_source_context();
+  ::google::protobuf::SourceContext* mutable_source_context();
   void set_allocated_source_context(::google::protobuf::SourceContext* source_context);
 
   // .google.protobuf.Syntax syntax = 7;
@@ -236,8 +252,8 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
   ::google::protobuf::internal::ArenaStringPtr version_;
   ::google::protobuf::SourceContext* source_context_;
   int syntax_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -252,46 +268,66 @@ class LIBPROTOBUF_EXPORT Method : public ::google::protobuf::Message /* @@protoc
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Method(Method&& from) noexcept
+    : Method() {
+    *this = ::std::move(from);
+  }
 
+  inline Method& operator=(Method&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const Method& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Method* internal_default_instance() {
     return reinterpret_cast<const Method*>(
                &_Method_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
   void Swap(Method* other);
+  friend void swap(Method& a, Method& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Method* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Method* New() const final {
+    return CreateMaybeMessage<Method>(NULL);
+  }
 
-  Method* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Method* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Method>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Method& from);
   void MergeFrom(const Method& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Method* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -302,7 +338,7 @@ class LIBPROTOBUF_EXPORT Method : public ::google::protobuf::Message /* @@protoc
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -312,11 +348,11 @@ class LIBPROTOBUF_EXPORT Method : public ::google::protobuf::Message /* @@protoc
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 6;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -391,8 +427,8 @@ class LIBPROTOBUF_EXPORT Method : public ::google::protobuf::Message /* @@protoc
   bool request_streaming_;
   bool response_streaming_;
   int syntax_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -407,46 +443,66 @@ class LIBPROTOBUF_EXPORT Mixin : public ::google::protobuf::Message /* @@protoc_
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Mixin(Mixin&& from) noexcept
+    : Mixin() {
+    *this = ::std::move(from);
+  }
 
+  inline Mixin& operator=(Mixin&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const Mixin& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Mixin* internal_default_instance() {
     return reinterpret_cast<const Mixin*>(
                &_Mixin_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
   void Swap(Mixin* other);
+  friend void swap(Mixin& a, Mixin& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Mixin* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Mixin* New() const final {
+    return CreateMaybeMessage<Mixin>(NULL);
+  }
 
-  Mixin* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Mixin* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Mixin>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Mixin& from);
   void MergeFrom(const Mixin& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Mixin* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -457,7 +513,7 @@ class LIBPROTOBUF_EXPORT Mixin : public ::google::protobuf::Message /* @@protoc_
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -497,15 +553,18 @@ class LIBPROTOBUF_EXPORT Mixin : public ::google::protobuf::Message /* @@protoc_
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::internal::ArenaStringPtr root_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fapi_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Api
 
 // string name = 1;
@@ -530,6 +589,7 @@ inline void Api::set_name(::std::string&& value) {
 }
 #endif
 inline void Api::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Api.name)
@@ -567,23 +627,23 @@ inline int Api::methods_size() const {
 inline void Api::clear_methods() {
   methods_.Clear();
 }
-inline const ::google::protobuf::Method& Api::methods(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.methods)
-  return methods_.Get(index);
-}
 inline ::google::protobuf::Method* Api::mutable_methods(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Api.methods)
   return methods_.Mutable(index);
 }
-inline ::google::protobuf::Method* Api::add_methods() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.methods)
-  return methods_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >*
 Api::mutable_methods() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.methods)
   return &methods_;
 }
+inline const ::google::protobuf::Method& Api::methods(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Api.methods)
+  return methods_.Get(index);
+}
+inline ::google::protobuf::Method* Api::add_methods() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Api.methods)
+  return methods_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Method >&
 Api::methods() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Api.methods)
@@ -594,26 +654,23 @@ Api::methods() const {
 inline int Api::options_size() const {
   return options_.size();
 }
-inline void Api::clear_options() {
-  options_.Clear();
-}
-inline const ::google::protobuf::Option& Api::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* Api::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Api.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* Api::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 Api::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& Api::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Api.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* Api::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Api.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 Api::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Api.options)
@@ -642,6 +699,7 @@ inline void Api::set_version(::std::string&& value) {
 }
 #endif
 inline void Api::set_version(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   version_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Api.version)
@@ -676,22 +734,14 @@ inline void Api::set_allocated_version(::std::string* version) {
 inline bool Api::has_source_context() const {
   return this != internal_default_instance() && source_context_ != NULL;
 }
-inline void Api::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
+inline const ::google::protobuf::SourceContext& Api::_internal_source_context() const {
+  return *source_context_;
 }
 inline const ::google::protobuf::SourceContext& Api::source_context() const {
+  const ::google::protobuf::SourceContext* p = source_context_;
   // @@protoc_insertion_point(field_get:google.protobuf.Api.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
-}
-inline ::google::protobuf::SourceContext* Api::mutable_source_context() {
-  
-  if (source_context_ == NULL) {
-    source_context_ = new ::google::protobuf::SourceContext;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.source_context)
-  return source_context_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::SourceContext*>(
+      &::google::protobuf::_SourceContext_default_instance_);
 }
 inline ::google::protobuf::SourceContext* Api::release_source_context() {
   // @@protoc_insertion_point(field_release:google.protobuf.Api.source_context)
@@ -700,14 +750,31 @@ inline ::google::protobuf::SourceContext* Api::release_source_context() {
   source_context_ = NULL;
   return temp;
 }
+inline ::google::protobuf::SourceContext* Api::mutable_source_context() {
+  
+  if (source_context_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::SourceContext>(GetArenaNoVirtual());
+    source_context_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.Api.source_context)
+  return source_context_;
+}
 inline void Api::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
-  delete source_context_;
-  source_context_ = source_context;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete reinterpret_cast< ::google::protobuf::MessageLite*>(source_context_);
+  }
   if (source_context) {
+    ::google::protobuf::Arena* submessage_arena = NULL;
+    if (message_arena != submessage_arena) {
+      source_context = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, source_context, submessage_arena);
+    }
     
   } else {
     
   }
+  source_context_ = source_context;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Api.source_context)
 }
 
@@ -718,23 +785,23 @@ inline int Api::mixins_size() const {
 inline void Api::clear_mixins() {
   mixins_.Clear();
 }
-inline const ::google::protobuf::Mixin& Api::mixins(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Api.mixins)
-  return mixins_.Get(index);
-}
 inline ::google::protobuf::Mixin* Api::mutable_mixins(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Api.mixins)
   return mixins_.Mutable(index);
 }
-inline ::google::protobuf::Mixin* Api::add_mixins() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Api.mixins)
-  return mixins_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >*
 Api::mutable_mixins() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Api.mixins)
   return &mixins_;
 }
+inline const ::google::protobuf::Mixin& Api::mixins(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Api.mixins)
+  return mixins_.Get(index);
+}
+inline ::google::protobuf::Mixin* Api::add_mixins() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Api.mixins)
+  return mixins_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Mixin >&
 Api::mixins() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Api.mixins)
@@ -781,6 +848,7 @@ inline void Method::set_name(::std::string&& value) {
 }
 #endif
 inline void Method::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Method.name)
@@ -833,6 +901,7 @@ inline void Method::set_request_type_url(::std::string&& value) {
 }
 #endif
 inline void Method::set_request_type_url(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   request_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Method.request_type_url)
@@ -899,6 +968,7 @@ inline void Method::set_response_type_url(::std::string&& value) {
 }
 #endif
 inline void Method::set_response_type_url(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   response_type_url_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Method.response_type_url)
@@ -947,26 +1017,23 @@ inline void Method::set_response_streaming(bool value) {
 inline int Method::options_size() const {
   return options_.size();
 }
-inline void Method::clear_options() {
-  options_.Clear();
-}
-inline const ::google::protobuf::Option& Method::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Method.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* Method::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Method.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* Method::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Method.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 Method::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Method.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& Method::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Method.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* Method::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Method.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 Method::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Method.options)
@@ -1013,6 +1080,7 @@ inline void Mixin::set_name(::std::string&& value) {
 }
 #endif
 inline void Mixin::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Mixin.name)
@@ -1065,6 +1133,7 @@ inline void Mixin::set_root(::std::string&& value) {
 }
 #endif
 inline void Mixin::set_root(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   root_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.Mixin.root)
@@ -1095,7 +1164,9 @@ inline void Mixin::set_allocated_root(::std::string* root) {
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Mixin.root)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -1103,10 +1174,9 @@ inline void Mixin::set_allocated_root(::std::string* root) {
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fapi_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fapi_2eproto
diff --git a/src/google/protobuf/api.proto b/src/google/protobuf/api.proto
index 7c30e8b7..f37ee2fa 100644
--- a/src/google/protobuf/api.proto
+++ b/src/google/protobuf/api.proto
@@ -42,26 +42,33 @@ option java_multiple_files = true;
 option objc_class_prefix = "GPB";
 option go_package = "google.golang.org/genproto/protobuf/api;api";
 
-// Api is a light-weight descriptor for a protocol buffer service.
+// Api is a light-weight descriptor for an API Interface.
+//
+// Interfaces are also described as "protocol buffer services" in some contexts,
+// such as by the "service" keyword in a .proto file, but they are different
+// from API Services, which represent a concrete implementation of an interface
+// as opposed to simply a description of methods and bindings. They are also
+// sometimes simply referred to as "APIs" in other contexts, such as the name of
+// this message itself. See https://cloud.google.com/apis/design/glossary for
+// detailed terminology.
 message Api {
 
-  // The fully qualified name of this api, including package name
-  // followed by the api's simple name.
+  // The fully qualified name of this interface, including package name
+  // followed by the interface's simple name.
   string name = 1;
 
-  // The methods of this api, in unspecified order.
+  // The methods of this interface, in unspecified order.
   repeated Method methods = 2;
 
-  // Any metadata attached to the API.
+  // Any metadata attached to the interface.
   repeated Option options = 3;
 
-  // A version string for this api. If specified, must have the form
-  // `major-version.minor-version`, as in `1.10`. If the minor version
-  // is omitted, it defaults to zero. If the entire version field is
-  // empty, the major version is derived from the package name, as
-  // outlined below. If the field is not empty, the version in the
-  // package name will be verified to be consistent with what is
-  // provided here.
+  // A version string for this interface. If specified, must have the form
+  // `major-version.minor-version`, as in `1.10`. If the minor version is
+  // omitted, it defaults to zero. If the entire version field is empty, the
+  // major version is derived from the package name, as outlined below. If the
+  // field is not empty, the version in the package name will be verified to be
+  // consistent with what is provided here.
   //
   // The versioning schema uses [semantic
   // versioning](http://semver.org) where the major version number
@@ -71,10 +78,10 @@ message Api {
   // chosen based on the product plan.
   //
   // The major version is also reflected in the package name of the
-  // API, which must end in `v<major-version>`, as in
+  // interface, which must end in `v<major-version>`, as in
   // `google.feature.v1`. For major versions 0 and 1, the suffix can
   // be omitted. Zero major versions must only be used for
-  // experimental, none-GA apis.
+  // experimental, non-GA interfaces.
   //
   //
   string version = 4;
@@ -83,14 +90,14 @@ message Api {
   // message.
   SourceContext source_context = 5;
 
-  // Included APIs. See [Mixin][].
+  // Included interfaces. See [Mixin][].
   repeated Mixin mixins = 6;
 
   // The source syntax of the service.
   Syntax syntax = 7;
 }
 
-// Method represents a method of an api.
+// Method represents a method of an API interface.
 message Method {
 
   // The simple name of this method.
@@ -115,9 +122,9 @@ message Method {
   Syntax syntax = 7;
 }
 
-// Declares an API to be included in this API. The including API must
-// redeclare all the methods from the included API, but documentation
-// and options are inherited as follows:
+// Declares an API Interface to be included in this interface. The including
+// interface must redeclare all the methods from the included interface, but
+// documentation and options are inherited as follows:
 //
 // - If after comment and whitespace stripping, the documentation
 //   string of the redeclared method is empty, it will be inherited
@@ -129,7 +136,8 @@ message Method {
 //
 // - If an http annotation is inherited, the path pattern will be
 //   modified as follows. Any version prefix will be replaced by the
-//   version of the including API plus the [root][] path if specified.
+//   version of the including interface plus the [root][] path if
+//   specified.
 //
 // Example of a simple mixin:
 //
@@ -193,7 +201,7 @@ message Method {
 //       ...
 //     }
 message Mixin {
-  // The fully qualified name of the API which is included.
+  // The fully qualified name of the interface which is included.
   string name = 1;
 
   // If non-empty specifies a path under which inherited HTTP paths
diff --git a/src/google/protobuf/arena.cc b/src/google/protobuf/arena.cc
index 16cf8951..c117c9e5 100755
--- a/src/google/protobuf/arena.cc
+++ b/src/google/protobuf/arena.cc
@@ -38,277 +38,377 @@
 #include <sanitizer/asan_interface.h>
 #endif  // ADDRESS_SANITIZER
 
+#include <google/protobuf/stubs/port.h>
+
 namespace google {
+static const size_t kMinCleanupListElements = 8;
+static const size_t kMaxCleanupListElements = 64;  // 1kB on 64-bit.
+
 namespace protobuf {
+namespace internal {
 
 
-google::protobuf::internal::SequenceNumber Arena::lifecycle_id_generator_;
+std::atomic<int64> ArenaImpl::lifecycle_id_generator_;
 #if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
-Arena::ThreadCache& Arena::thread_cache() {
+ArenaImpl::ThreadCache& ArenaImpl::thread_cache() {
   static internal::ThreadLocalStorage<ThreadCache>* thread_cache_ =
       new internal::ThreadLocalStorage<ThreadCache>();
   return *thread_cache_->Get();
 }
 #elif defined(PROTOBUF_USE_DLLS)
-Arena::ThreadCache& Arena::thread_cache() {
+ArenaImpl::ThreadCache& ArenaImpl::thread_cache() {
   static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_ = { -1, NULL };
   return thread_cache_;
 }
 #else
-GOOGLE_THREAD_LOCAL Arena::ThreadCache Arena::thread_cache_ = { -1, NULL };
+GOOGLE_THREAD_LOCAL ArenaImpl::ThreadCache ArenaImpl::thread_cache_ = {-1, NULL};
 #endif
 
-void Arena::Init() {
-  lifecycle_id_ = lifecycle_id_generator_.GetNext();
-  blocks_ = 0;
-  hint_ = 0;
-  space_allocated_ = 0;
-  owns_first_block_ = true;
-  cleanup_list_ = 0;
-
-  if (options_.initial_block != NULL && options_.initial_block_size > 0) {
-    GOOGLE_CHECK_GE(options_.initial_block_size, sizeof(Block))
-        << ": Initial block size too small for header.";
-
-    // Add first unowned block to list.
-    Block* first_block = reinterpret_cast<Block*>(options_.initial_block);
-    first_block->size = options_.initial_block_size;
-    first_block->pos = kHeaderSize;
-    first_block->next = NULL;
-    // Thread which calls Init() owns the first block. This allows the
-    // single-threaded case to allocate on the first block without taking any
-    // locks.
-    first_block->owner = &thread_cache();
-    SetThreadCacheBlock(first_block);
-    AddBlockInternal(first_block);
-    owns_first_block_ = false;
-  }
+void ArenaImpl::Init() {
+  lifecycle_id_ =
+      lifecycle_id_generator_.fetch_add(1, std::memory_order_relaxed);
+  hint_.store(nullptr, std::memory_order_relaxed);
+  threads_.store(nullptr, std::memory_order_relaxed);
 
-  // Call the initialization hook
-  if (options_.on_arena_init != NULL) {
-    hooks_cookie_ = options_.on_arena_init(this);
+  if (initial_block_) {
+    // Thread which calls Init() owns the first block. This allows the
+    // single-threaded case to allocate on the first block without having to
+    // perform atomic operations.
+    new (initial_block_) Block(options_.initial_block_size, NULL);
+    SerialArena* serial =
+        SerialArena::New(initial_block_, &thread_cache(), this);
+    serial->set_next(NULL);
+    threads_.store(serial, std::memory_order_relaxed);
+    space_allocated_.store(options_.initial_block_size,
+                           std::memory_order_relaxed);
+    CacheSerialArena(serial);
   } else {
-    hooks_cookie_ = NULL;
+    space_allocated_.store(0, std::memory_order_relaxed);
   }
 }
 
-Arena::~Arena() {
-  uint64 space_allocated = ResetInternal();
-
-  // Call the destruction hook
-  if (options_.on_arena_destruction != NULL) {
-    options_.on_arena_destruction(this, hooks_cookie_, space_allocated);
-  }
-}
-
-uint64 Arena::Reset() {
-  // Invalidate any ThreadCaches pointing to any blocks we just destroyed.
-  lifecycle_id_ = lifecycle_id_generator_.GetNext();
-  return ResetInternal();
+ArenaImpl::~ArenaImpl() {
+  // Have to do this in a first pass, because some of the destructors might
+  // refer to memory in other blocks.
+  CleanupList();
+  FreeBlocks();
 }
 
-uint64 Arena::ResetInternal() {
+uint64 ArenaImpl::Reset() {
+  // Have to do this in a first pass, because some of the destructors might
+  // refer to memory in other blocks.
   CleanupList();
   uint64 space_allocated = FreeBlocks();
-
-  // Call the reset hook
-  if (options_.on_arena_reset != NULL) {
-    options_.on_arena_reset(this, hooks_cookie_, space_allocated);
-  }
+  Init();
 
   return space_allocated;
 }
 
-Arena::Block* Arena::NewBlock(void* me, Block* my_last_block, size_t n,
-                              size_t start_block_size, size_t max_block_size) {
+ArenaImpl::Block* ArenaImpl::NewBlock(Block* last_block, size_t min_bytes) {
   size_t size;
-  if (my_last_block != NULL) {
+  if (last_block) {
     // Double the current block size, up to a limit.
-    size = 2 * (my_last_block->size);
-    if (size > max_block_size) size = max_block_size;
+    size = std::min(2 * last_block->size(), options_.max_block_size);
   } else {
-    size = start_block_size;
+    size = options_.start_block_size;
   }
-  // Verify that n + kHeaderSize won't overflow.
-  GOOGLE_CHECK_LE(n, std::numeric_limits<size_t>::max() - kHeaderSize);
-  size = std::max(size, kHeaderSize + n);
-
-  Block* b = reinterpret_cast<Block*>(options_.block_alloc(size));
-  b->pos = kHeaderSize + n;
-  b->size = size;
-  b->owner = me;
-#ifdef ADDRESS_SANITIZER
-  // Poison the rest of the block for ASAN. It was unpoisoned by the underlying
-  // malloc but it's not yet usable until we return it as part of an allocation.
-  ASAN_POISON_MEMORY_REGION(
-      reinterpret_cast<char*>(b) + b->pos, b->size - b->pos);
-#endif  // ADDRESS_SANITIZER
+  // Verify that min_bytes + kBlockHeaderSize won't overflow.
+  GOOGLE_CHECK_LE(min_bytes, std::numeric_limits<size_t>::max() - kBlockHeaderSize);
+  size = std::max(size, kBlockHeaderSize + min_bytes);
+
+  void* mem = options_.block_alloc(size);
+  Block* b = new (mem) Block(size, last_block);
+  space_allocated_.fetch_add(size, std::memory_order_relaxed);
   return b;
 }
 
-void Arena::AddBlock(Block* b) {
-  MutexLock l(&blocks_lock_);
-  AddBlockInternal(b);
+ArenaImpl::Block::Block(size_t size, Block* next)
+    : next_(next), pos_(kBlockHeaderSize), size_(size) {}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void ArenaImpl::SerialArena::AddCleanupFallback(void* elem,
+                                                void (*cleanup)(void*)) {
+  size_t size = cleanup_ ? cleanup_->size * 2 : kMinCleanupListElements;
+  size = std::min(size, kMaxCleanupListElements);
+  size_t bytes = internal::AlignUpTo8(CleanupChunk::SizeOf(size));
+  CleanupChunk* list = reinterpret_cast<CleanupChunk*>(AllocateAligned(bytes));
+  list->next = cleanup_;
+  list->size = size;
+
+  cleanup_ = list;
+  cleanup_ptr_ = &list->nodes[0];
+  cleanup_limit_ = &list->nodes[size];
+
+  AddCleanup(elem, cleanup);
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_FUNC_ALIGN(32)
+void* ArenaImpl::AllocateAligned(size_t n) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena->AllocateAligned(n);
+  } else {
+    return AllocateAlignedFallback(n);
+  }
 }
 
-void Arena::AddBlockInternal(Block* b) {
-  b->next = reinterpret_cast<Block*>(google::protobuf::internal::NoBarrier_Load(&blocks_));
-  google::protobuf::internal::Release_Store(&blocks_, reinterpret_cast<google::protobuf::internal::AtomicWord>(b));
-  if (b->avail() != 0) {
-    // Direct future allocations to this block.
-    google::protobuf::internal::Release_Store(&hint_, reinterpret_cast<google::protobuf::internal::AtomicWord>(b));
+void* ArenaImpl::AllocateAlignedAndAddCleanup(size_t n,
+                                              void (*cleanup)(void*)) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena->AllocateAlignedAndAddCleanup(n, cleanup);
+  } else {
+    return AllocateAlignedAndAddCleanupFallback(n, cleanup);
   }
-  space_allocated_ += b->size;
 }
 
-void Arena::AddListNode(void* elem, void (*cleanup)(void*)) {
-  Node* node = reinterpret_cast<Node*>(AllocateAligned(sizeof(Node)));
-  node->elem = elem;
-  node->cleanup = cleanup;
-  node->next = reinterpret_cast<Node*>(
-      google::protobuf::internal::NoBarrier_AtomicExchange(&cleanup_list_,
-            reinterpret_cast<google::protobuf::internal::AtomicWord>(node)));
+void ArenaImpl::AddCleanup(void* elem, void (*cleanup)(void*)) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    arena->AddCleanup(elem, cleanup);
+  } else {
+    return AddCleanupFallback(elem, cleanup);
+  }
 }
 
-void* Arena::AllocateAligned(const std::type_info* allocated, size_t n) {
-  // Align n to next multiple of 8 (from Hacker's Delight, Chapter 3.)
-  n = (n + 7) & -8;
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::AllocateAlignedFallback(size_t n) {
+  return GetSerialArena()->AllocateAligned(n);
+}
 
-  // Monitor allocation if needed.
-  if (GOOGLE_PREDICT_FALSE(hooks_cookie_ != NULL) &&
-      options_.on_arena_allocation != NULL) {
-    options_.on_arena_allocation(allocated, n, hooks_cookie_);
-  }
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::AllocateAlignedAndAddCleanupFallback(size_t n,
+                                                      void (*cleanup)(void*)) {
+  return GetSerialArena()->AllocateAlignedAndAddCleanup(n, cleanup);
+}
 
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void ArenaImpl::AddCleanupFallback(void* elem, void (*cleanup)(void*)) {
+  GetSerialArena()->AddCleanup(elem, cleanup);
+}
+
+inline GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+bool ArenaImpl::GetSerialArenaFast(ArenaImpl::SerialArena** arena) {
   // If this thread already owns a block in this arena then try to use that.
   // This fast path optimizes the case where multiple threads allocate from the
   // same arena.
-  if (thread_cache().last_lifecycle_id_seen == lifecycle_id_ &&
-      thread_cache().last_block_used_ != NULL) {
-    if (thread_cache().last_block_used_->avail() < n) {
-      return SlowAlloc(n);
-    }
-    return AllocFromBlock(thread_cache().last_block_used_, n);
+  ThreadCache* tc = &thread_cache();
+  if (GOOGLE_PREDICT_TRUE(tc->last_lifecycle_id_seen == lifecycle_id_)) {
+    *arena = tc->last_serial_arena;
+    return true;
   }
 
-  // Check whether we own the last accessed block on this arena.
-  // This fast path optimizes the case where a single thread uses multiple
-  // arenas.
-  void* me = &thread_cache();
-  Block* b = reinterpret_cast<Block*>(google::protobuf::internal::Acquire_Load(&hint_));
-  if (!b || b->owner != me || b->avail() < n) {
-    return SlowAlloc(n);
+  // Check whether we own the last accessed SerialArena on this arena.  This
+  // fast path optimizes the case where a single thread uses multiple arenas.
+  SerialArena* serial = hint_.load(std::memory_order_acquire);
+  if (GOOGLE_PREDICT_TRUE(serial != NULL && serial->owner() == tc)) {
+    *arena = serial;
+    return true;
+  }
+
+  return false;
+}
+
+ArenaImpl::SerialArena* ArenaImpl::GetSerialArena() {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena;
+  } else {
+    return GetSerialArenaFallback(&thread_cache());
   }
-  return AllocFromBlock(b, n);
 }
 
-void* Arena::AllocFromBlock(Block* b, size_t n) {
-  size_t p = b->pos;
-  b->pos = p + n;
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::SerialArena::AllocateAlignedFallback(size_t n) {
+  // Sync back to current's pos.
+  head_->set_pos(head_->size() - (limit_ - ptr_));
+
+  head_ = arena_->NewBlock(head_, n);
+  ptr_ = head_->Pointer(head_->pos());
+  limit_ = head_->Pointer(head_->size());
+
 #ifdef ADDRESS_SANITIZER
-  ASAN_UNPOISON_MEMORY_REGION(reinterpret_cast<char*>(b) + p, n);
+  ASAN_POISON_MEMORY_REGION(ptr_, limit_ - ptr_);
 #endif  // ADDRESS_SANITIZER
-  return reinterpret_cast<char*>(b) + p;
-}
 
-void* Arena::SlowAlloc(size_t n) {
-  void* me = &thread_cache();
-  Block* b = FindBlock(me);  // Find block owned by me.
-  // See if allocation fits in my latest block.
-  if (b != NULL && b->avail() >= n) {
-    SetThreadCacheBlock(b);
-    google::protobuf::internal::NoBarrier_Store(&hint_, reinterpret_cast<google::protobuf::internal::AtomicWord>(b));
-    return AllocFromBlock(b, n);
-  }
-  b = NewBlock(me, b, n, options_.start_block_size, options_.max_block_size);
-  AddBlock(b);
-  SetThreadCacheBlock(b);
-  return reinterpret_cast<char*>(b) + kHeaderSize;
+  return AllocateAligned(n);
 }
 
-uint64 Arena::SpaceAllocated() const {
-  MutexLock l(&blocks_lock_);
-  return space_allocated_;
+uint64 ArenaImpl::SpaceAllocated() const {
+  return space_allocated_.load(std::memory_order_relaxed);
 }
 
-uint64 Arena::SpaceUsed() const {
+uint64 ArenaImpl::SpaceUsed() const {
+  SerialArena* serial = threads_.load(std::memory_order_acquire);
   uint64 space_used = 0;
-  Block* b = reinterpret_cast<Block*>(google::protobuf::internal::NoBarrier_Load(&blocks_));
-  while (b != NULL) {
-    space_used += (b->pos - kHeaderSize);
-    b = b->next;
+  for ( ; serial; serial = serial->next()) {
+    space_used += serial->SpaceUsed();
   }
   return space_used;
 }
 
-std::pair<uint64, uint64> Arena::SpaceAllocatedAndUsed() const {
-  return std::make_pair(SpaceAllocated(), SpaceUsed());
+uint64 ArenaImpl::SerialArena::SpaceUsed() const {
+  // Get current block's size from ptr_ (since we can't trust head_->pos().
+  uint64 space_used = ptr_ - head_->Pointer(kBlockHeaderSize);
+  // Get subsequent block size from b->pos().
+  for (Block* b = head_->next(); b; b = b->next()) {
+    space_used += (b->pos() - kBlockHeaderSize);
+  }
+  // Remove the overhead of the SerialArena itself.
+  space_used -= kSerialArenaSize;
+  return space_used;
 }
 
-uint64 Arena::FreeBlocks() {
+uint64 ArenaImpl::FreeBlocks() {
   uint64 space_allocated = 0;
-  Block* b = reinterpret_cast<Block*>(google::protobuf::internal::NoBarrier_Load(&blocks_));
-  Block* first_block = NULL;
-  while (b != NULL) {
-    space_allocated += (b->size);
-    Block* next = b->next;
-    if (next != NULL) {
-#ifdef ADDRESS_SANITIZER
-      // This memory was provided by the underlying allocator as unpoisoned, so
-      // return it in an unpoisoned state.
-      ASAN_UNPOISON_MEMORY_REGION(reinterpret_cast<char*>(b), b->size);
-#endif  // ADDRESS_SANITIZER
-      options_.block_dealloc(b, b->size);
-    } else {
-      if (owns_first_block_) {
+  // By omitting an Acquire barrier we ensure that any user code that doesn't
+  // properly synchronize Reset() or the destructor will throw a TSAN warning.
+  SerialArena* serial = threads_.load(std::memory_order_relaxed);
+
+  while (serial) {
+    // This is inside a block we are freeing, so we need to read it now.
+    SerialArena* next = serial->next();
+    space_allocated += ArenaImpl::SerialArena::Free(serial, initial_block_,
+                                                    options_.block_dealloc);
+    // serial is dead now.
+    serial = next;
+  }
+
+  return space_allocated;
+}
+
+uint64 ArenaImpl::SerialArena::Free(ArenaImpl::SerialArena* serial,
+                                    Block* initial_block,
+                                    void (*block_dealloc)(void*, size_t)) {
+  uint64 space_allocated = 0;
+
+  // We have to be careful in this function, since we will be freeing the Block
+  // that contains this SerialArena.  Be careful about accessing |serial|.
+
+  for (Block* b = serial->head_; b; ) {
+    // This is inside the block we are freeing, so we need to read it now.
+    Block* next_block = b->next();
+    space_allocated += (b->size());
+
 #ifdef ADDRESS_SANITIZER
-        // This memory was provided by the underlying allocator as unpoisoned,
-        // so return it in an unpoisoned state.
-        ASAN_UNPOISON_MEMORY_REGION(reinterpret_cast<char*>(b), b->size);
+    // This memory was provided by the underlying allocator as unpoisoned, so
+    // return it in an unpoisoned state.
+    ASAN_UNPOISON_MEMORY_REGION(b->Pointer(0), b->size());
 #endif  // ADDRESS_SANITIZER
-        options_.block_dealloc(b, b->size);
-      } else {
-        // User passed in the first block, skip free'ing the memory.
-        first_block = b;
-      }
+
+    if (b != initial_block) {
+      block_dealloc(b, b->size());
     }
-    b = next;
-  }
-  blocks_ = 0;
-  hint_ = 0;
-  space_allocated_ = 0;
-  if (!owns_first_block_) {
-    // Make the first block that was passed in through ArenaOptions
-    // available for reuse.
-    first_block->pos = kHeaderSize;
-    // Thread which calls Reset() owns the first block. This allows the
-    // single-threaded case to allocate on the first block without taking any
-    // locks.
-    first_block->owner = &thread_cache();
-    SetThreadCacheBlock(first_block);
-    AddBlockInternal(first_block);
+
+    b = next_block;
   }
+
   return space_allocated;
 }
 
-void Arena::CleanupList() {
-  Node* head =
-      reinterpret_cast<Node*>(google::protobuf::internal::NoBarrier_Load(&cleanup_list_));
-  while (head != NULL) {
-    head->cleanup(head->elem);
-    head = head->next;
+void ArenaImpl::CleanupList() {
+  // By omitting an Acquire barrier we ensure that any user code that doesn't
+  // properly synchronize Reset() or the destructor will throw a TSAN warning.
+  SerialArena* serial = threads_.load(std::memory_order_relaxed);
+
+  for ( ; serial; serial = serial->next()) {
+    serial->CleanupList();
   }
-  cleanup_list_ = 0;
 }
 
-Arena::Block* Arena::FindBlock(void* me) {
-  // TODO(sanjay): We might want to keep a separate list with one
-  // entry per thread.
-  Block* b = reinterpret_cast<Block*>(google::protobuf::internal::Acquire_Load(&blocks_));
-  while (b != NULL && b->owner != me) {
-    b = b->next;
+void ArenaImpl::SerialArena::CleanupList() {
+  if (cleanup_ != NULL) {
+    CleanupListFallback();
+  }
+}
+
+void ArenaImpl::SerialArena::CleanupListFallback() {
+  // Cleanup newest chunk: ptrs give us length.
+  size_t n = cleanup_ptr_ - &cleanup_->nodes[0];
+  CleanupNode* node = cleanup_ptr_;
+  for (size_t i = 0; i < n; i++) {
+    --node;
+    node->cleanup(node->elem);
+  }
+
+  // Cleanup older chunks, which are known to be full.
+  CleanupChunk* list = cleanup_->next;
+  while (list) {
+    size_t n = list->size;
+    CleanupNode* node = &list->nodes[list->size];
+    for (size_t i = 0; i < n; i++) {
+      --node;
+      node->cleanup(node->elem);
+    }
+    list = list->next;
+  }
+}
+
+ArenaImpl::SerialArena* ArenaImpl::SerialArena::New(Block* b, void* owner,
+                                                    ArenaImpl* arena) {
+  GOOGLE_DCHECK_EQ(b->pos(), kBlockHeaderSize);  // Should be a fresh block
+  GOOGLE_DCHECK_LE(kBlockHeaderSize + kSerialArenaSize, b->size());
+  SerialArena* serial =
+      reinterpret_cast<SerialArena*>(b->Pointer(kBlockHeaderSize));
+  b->set_pos(kBlockHeaderSize + kSerialArenaSize);
+  serial->arena_ = arena;
+  serial->owner_ = owner;
+  serial->head_ = b;
+  serial->ptr_ = b->Pointer(b->pos());
+  serial->limit_ = b->Pointer(b->size());
+  serial->cleanup_ = NULL;
+  serial->cleanup_ptr_ = NULL;
+  serial->cleanup_limit_ = NULL;
+  return serial;
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+ArenaImpl::SerialArena* ArenaImpl::GetSerialArenaFallback(void* me) {
+  // Look for this SerialArena in our linked list.
+  SerialArena* serial = threads_.load(std::memory_order_acquire);
+  for ( ; serial; serial = serial->next()) {
+    if (serial->owner() == me) {
+      break;
+    }
+  }
+
+  if (!serial) {
+    // This thread doesn't have any SerialArena, which also means it doesn't
+    // have any blocks yet.  So we'll allocate its first block now.
+    Block* b = NewBlock(NULL, kSerialArenaSize);
+    serial = SerialArena::New(b, me, this);
+
+    SerialArena* head = threads_.load(std::memory_order_relaxed);
+    do {
+      serial->set_next(head);
+    } while (!threads_.compare_exchange_weak(
+        head, serial, std::memory_order_release, std::memory_order_relaxed));
+  }
+
+  CacheSerialArena(serial);
+  return serial;
+}
+
+}  // namespace internal
+
+void Arena::CallDestructorHooks() {
+  uint64 space_allocated = impl_.SpaceAllocated();
+  // Call the reset hook
+  if (on_arena_reset_ != NULL) {
+    on_arena_reset_(this, hooks_cookie_, space_allocated);
+  }
+
+  // Call the destruction hook
+  if (on_arena_destruction_ != NULL) {
+    on_arena_destruction_(this, hooks_cookie_, space_allocated);
+  }
+}
+
+void Arena::OnArenaAllocation(const std::type_info* allocated_type,
+                              size_t n) const {
+  if (on_arena_allocation_ != NULL) {
+    on_arena_allocation_(allocated_type, n, hooks_cookie_);
   }
-  return b;
 }
 
 }  // namespace protobuf
diff --git a/src/google/protobuf/arena.h b/src/google/protobuf/arena.h
index 05e05ebc..9928c8e6 100644
--- a/src/google/protobuf/arena.h
+++ b/src/google/protobuf/arena.h
@@ -37,10 +37,7 @@
 #ifdef max
 #undef max  // Visual Studio defines this macro
 #endif
-#if __cplusplus >= 201103L
-#include <google/protobuf/stubs/type_traits.h>
-#endif
-#if defined(_MSC_VER) && !_HAS_EXCEPTIONS
+#if defined(_MSC_VER) && !defined(_LIBCPP_STD_VER) && !_HAS_EXCEPTIONS
 // Work around bugs in MSVC <typeinfo> header when _HAS_EXCEPTIONS=0.
 #include <exception>
 #include <typeinfo>
@@ -51,32 +48,50 @@ using type_info = ::type_info;
 #include <typeinfo>
 #endif
 
-#include <google/protobuf/stubs/atomic_sequence_num.h>
-#include <google/protobuf/stubs/atomicops.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/mutex.h>
-#include <google/protobuf/stubs/type_traits.h>
-
+#include <google/protobuf/arena_impl.h>
+#include <google/protobuf/stubs/port.h>
+#include <type_traits>
 
 namespace google {
 namespace protobuf {
 
-class Arena;       // defined below
-class Message;     // message.h
+struct ArenaOptions;  // defined below
+
+}  // namespace protobuf
+
+namespace quality_webanswers {
+
+void TempPrivateWorkAround(::google::protobuf::ArenaOptions* arena_options);
+
+}  // namespace quality_webanswers
+
+namespace protobuf {
+
+class Arena;          // defined below
+class Message;        // defined in message.h
+class MessageLite;
+
+namespace arena_metrics {
+
+void EnableArenaMetrics(::google::protobuf::ArenaOptions* options);
+
+}  // namespace arena_metrics
 
 namespace internal {
-class ArenaString; // arenastring.h
-class LazyField;   // lazy_field.h
 
-template<typename Type>
-class GenericTypeHandler; // repeated_field.h
+struct ArenaStringPtr;     // defined in arenastring.h
+class LazyField;           // defined in lazy_field.h
+
+template <typename Type>
+class GenericTypeHandler;  // defined in repeated_field.h
 
 // Templated cleanup methods.
-template<typename T> void arena_destruct_object(void* object) {
+template <typename T>
+void arena_destruct_object(void* object) {
   reinterpret_cast<T*>(object)->~T();
 }
-template<typename T> void arena_delete_object(void* object) {
+template <typename T>
+void arena_delete_object(void* object) {
   delete reinterpret_cast<T*>(object);
 }
 inline void arena_free(void* object, size_t size) {
@@ -123,6 +138,19 @@ struct ArenaOptions {
   // calls free.
   void (*block_dealloc)(void*, size_t);
 
+  ArenaOptions()
+      : start_block_size(kDefaultStartBlockSize),
+        max_block_size(kDefaultMaxBlockSize),
+        initial_block(NULL),
+        initial_block_size(0),
+        block_alloc(&::operator new),
+        block_dealloc(&internal::arena_free),
+        on_arena_init(NULL),
+        on_arena_reset(NULL),
+        on_arena_destruction(NULL),
+        on_arena_allocation(NULL) {}
+
+ private:
   // Hooks for adding external functionality such as user-specific metrics
   // collection, specific debugging abilities, etc.
   // Init hook may return a pointer to a cookie to be stored in the arena.
@@ -142,25 +170,17 @@ struct ArenaOptions {
   // intentionally want to avoid monitoring an allocation. (i.e. internal
   // allocations for managing the arena)
   void (*on_arena_allocation)(const std::type_info* allocated_type,
-      uint64 alloc_size, void* cookie);
+                              uint64 alloc_size, void* cookie);
 
-  ArenaOptions()
-      : start_block_size(kDefaultStartBlockSize),
-        max_block_size(kDefaultMaxBlockSize),
-        initial_block(NULL),
-        initial_block_size(0),
-        block_alloc(&::operator new),
-        block_dealloc(&internal::arena_free),
-        on_arena_init(NULL),
-        on_arena_reset(NULL),
-        on_arena_destruction(NULL),
-        on_arena_allocation(NULL) {}
-
- private:
   // Constants define default starting block size and max block size for
   // arena allocator behavior -- see descriptions above.
   static const size_t kDefaultStartBlockSize = 256;
-  static const size_t kDefaultMaxBlockSize   = 8192;
+  static const size_t kDefaultMaxBlockSize = 8192;
+
+  friend void ::google::protobuf::arena_metrics::EnableArenaMetrics(ArenaOptions*);
+  friend void quality_webanswers::TempPrivateWorkAround(ArenaOptions*);
+  friend class Arena;
+  friend class ArenaOptionsTestFriend;
 };
 
 // Support for non-RTTI environments. (The metrics hooks API uses type
@@ -225,21 +245,40 @@ class LIBPROTOBUF_EXPORT Arena {
  public:
   // Arena constructor taking custom options. See ArenaOptions below for
   // descriptions of the options available.
-  explicit Arena(const ArenaOptions& options) : options_(options) {
-    Init();
+  explicit Arena(const ArenaOptions& options) : impl_(options) {
+    Init(options);
   }
 
+  // Block overhead.  Use this as a guide for how much to over-allocate the
+  // initial block if you want an allocation of size N to fit inside it.
+  //
+  // WARNING: if you allocate multiple objects, it is difficult to guarantee
+  // that a series of allocations will fit in the initial block, especially if
+  // Arena changes its alignment guarantees in the future!
+  static const size_t kBlockOverhead = internal::ArenaImpl::kBlockHeaderSize +
+                                       internal::ArenaImpl::kSerialArenaSize;
+
   // Default constructor with sensible default options, tuned for average
   // use-cases.
-  Arena() {
-    Init();
+  Arena() : impl_(ArenaOptions()) { Init(ArenaOptions()); }
+
+  ~Arena() {
+    if (hooks_cookie_) {
+      CallDestructorHooks();
+    }
   }
 
-  // Destructor deletes all owned heap allocated objects, and destructs objects
-  // that have non-trivial destructors, except for proto2 message objects whose
-  // destructors can be skipped. Also, frees all blocks except the initial block
-  // if it was passed in.
-  ~Arena();
+  void Init(const ArenaOptions& options) {
+    on_arena_allocation_ = options.on_arena_allocation;
+    on_arena_reset_ = options.on_arena_reset;
+    on_arena_destruction_ = options.on_arena_destruction;
+    // Call the initialization hook
+    if (options.on_arena_init != NULL) {
+      hooks_cookie_ = options.on_arena_init(this);
+    } else {
+      hooks_cookie_ = NULL;
+    }
+  }
 
   // API to create proto2 message objects on the arena. If the arena passed in
   // is NULL, then a heap allocated object is returned. Type T must be a message
@@ -251,41 +290,16 @@ class LIBPROTOBUF_EXPORT Arena {
   //
   // This function also accepts any type T that satisfies the arena message
   // allocation protocol, documented above.
-  template <typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* CreateMessage(::google::protobuf::Arena* arena) {
-    if (arena == NULL) {
-      return new T;
-    } else {
-      return arena->CreateMessageInternal<T>(static_cast<T*>(0));
-    }
-  }
-
-  // One-argument form of CreateMessage. This is useful for constructing objects
-  // that implement the arena message construction protocol described above but
-  // take additional constructor arguments.
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* CreateMessage(::google::protobuf::Arena* arena, const Arg& arg) {
-    if (arena == NULL) {
-      return new T(NULL, arg);
-    } else {
-      return arena->CreateMessageInternal<T>(static_cast<T*>(0),
-                                             arg);
-    }
-  }
-
-  // Two-argument form of CreateMessage. This is useful for constructing objects
-  // that implement the arena message construction protocol described above but
-  // take additional constructor arguments.
-  template <typename T, typename Arg1, typename Arg2> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* CreateMessage(::google::protobuf::Arena* arena,
-                          const Arg1& arg1,
-                          const Arg2& arg2) {
-    if (arena == NULL) {
-      return new T(NULL, arg1, arg2);
-    } else {
-      return arena->CreateMessageInternal<T>(static_cast<T*>(0),
-                                             arg1, arg2);
-    }
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateMessage(
+      Arena* arena, Args&&... args) {
+    static_assert(
+        InternalHelper<T>::is_arena_constructable::value,
+        "CreateMessage can only construct types that are ArenaConstructable");
+    // We must delegate to CreateMaybeMessage() and NOT CreateMessageInternal()
+    // because protobuf generated classes specialize CreateMaybeMessage() and we
+    // need to use that specialization for code size reasons.
+    return Arena::CreateMaybeMessage<T>(arena, std::forward<Args>(args)...);
   }
 
   // API to create any objects on the arena. Note that only the object will
@@ -303,143 +317,11 @@ class LIBPROTOBUF_EXPORT Arena {
   // (unless the destructor is trivial). Hence, from T's point of view, it is as
   // if the object were allocated on the heap (except that the underlying memory
   // is obtained from the arena).
-  template <typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* Create(::google::protobuf::Arena* arena) {
-    if (arena == NULL) {
-      return new T();
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value);
-    }
-  }
-
-  // Version of the above with one constructor argument for the created object.
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* Create(::google::protobuf::Arena* arena, const Arg& arg) {
-    if (arena == NULL) {
-      return new T(arg);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg);
-    }
-  }
-#if LANG_CXX11
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* Create(::google::protobuf::Arena* arena, Arg&& arg) {
-    if (arena == NULL) {
-      return new T(std::move(arg));
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      std::move(arg));
-    }
-  }
-#endif
-
-  // Version of the above with two constructor arguments for the created object.
-  template <typename T, typename Arg1, typename Arg2> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* Create(::google::protobuf::Arena* arena, const Arg1& arg1, const Arg2& arg2) {
-    if (arena == NULL) {
-      return new T(arg1, arg2);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2);
-    }
-  }
-
-  // Version of the above with three constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2, arg3);
-    }
-  }
-
-  // Version of the above with four constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3, const Arg4& arg4) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3, arg4);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2, arg3, arg4);
-    }
-  }
-
-  // Version of the above with five constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3, const Arg4& arg4,
-                                           const Arg5& arg5) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3, arg4, arg5);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2, arg3, arg4, arg5);
-    }
-  }
-
-  // Version of the above with six constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3, const Arg4& arg4,
-                                           const Arg5& arg5, const Arg6& arg6) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3, arg4, arg5, arg6);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2, arg3, arg4, arg5, arg6);
-    }
-  }
-
-  // Version of the above with seven constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6, typename Arg7>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3, const Arg4& arg4,
-                                           const Arg5& arg5, const Arg6& arg6,
-                                           const Arg7& arg7) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
-    } else {
-      return arena->CreateInternal<T>(google::protobuf::internal::has_trivial_destructor<T>::value,
-                                      arg1, arg2, arg3, arg4, arg5, arg6, arg7);
-    }
-  }
-
-  // Version of the above with eight constructor arguments for the created
-  // object.
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6, typename Arg7,
-            typename Arg8>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static T* Create(::google::protobuf::Arena* arena,
-                                           const Arg1& arg1, const Arg2& arg2,
-                                           const Arg3& arg3, const Arg4& arg4,
-                                           const Arg5& arg5, const Arg6& arg6,
-                                           const Arg7& arg7, const Arg8& arg8) {
-    if (arena == NULL) {
-      return new T(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
-    } else {
-      return arena->CreateInternal<T>(
-          google::protobuf::internal::has_trivial_destructor<T>::value,
-          arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
-    }
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* Create(Arena* arena,
+                                                           Args&&... args) {
+    return CreateNoMessage<T>(arena, is_arena_constructable<T>(),
+                              std::forward<Args>(args)...);
   }
 
   // Create an array of object type T on the arena *without* invoking the
@@ -448,10 +330,14 @@ class LIBPROTOBUF_EXPORT Arena {
   // To ensure safe uses, this function checks at compile time
   // (when compiled as C++11) that T is trivially default-constructible and
   // trivially destructible.
-  template <typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* CreateArray(::google::protobuf::Arena* arena, size_t num_elements) {
-    GOOGLE_CHECK_LE(num_elements,
-             std::numeric_limits<size_t>::max() / sizeof(T))
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateArray(
+      Arena* arena, size_t num_elements) {
+    static_assert(std::is_pod<T>::value,
+                  "CreateArray requires a trivially constructible type");
+    static_assert(std::is_trivially_destructible<T>::value,
+                  "CreateArray requires a trivially destructible type");
+    GOOGLE_CHECK_LE(num_elements, std::numeric_limits<size_t>::max() / sizeof(T))
         << "Requested size is too large to fit into size_t.";
     if (arena == NULL) {
       return static_cast<T*>(::operator new[](num_elements * sizeof(T)));
@@ -463,30 +349,39 @@ class LIBPROTOBUF_EXPORT Arena {
   // Returns the total space allocated by the arena, which is the sum of the
   // sizes of the underlying blocks. This method is relatively fast; a counter
   // is kept as blocks are allocated.
-  uint64 SpaceAllocated() const;
+  uint64 SpaceAllocated() const { return impl_.SpaceAllocated(); }
   // Returns the total space used by the arena. Similar to SpaceAllocated but
   // does not include free space and block overhead. The total space returned
   // may not include space used by other threads executing concurrently with
   // the call to this method.
-  GOOGLE_ATTRIBUTE_NOINLINE uint64 SpaceUsed() const;
+  uint64 SpaceUsed() const { return impl_.SpaceUsed(); }
   // DEPRECATED. Please use SpaceAllocated() and SpaceUsed().
   //
   // Combines SpaceAllocated and SpaceUsed. Returns a pair of
   // <space_allocated, space_used>.
-  GOOGLE_ATTRIBUTE_NOINLINE std::pair<uint64, uint64> SpaceAllocatedAndUsed() const;
+  PROTOBUF_RUNTIME_DEPRECATED("Please use SpaceAllocated() and SpaceUsed()")
+  std::pair<uint64, uint64> SpaceAllocatedAndUsed() const {
+    return std::make_pair(SpaceAllocated(), SpaceUsed());
+  }
 
   // Frees all storage allocated by this arena after calling destructors
   // registered with OwnDestructor() and freeing objects registered with Own().
   // Any objects allocated on this arena are unusable after this call. It also
   // returns the total space used by the arena which is the sums of the sizes
   // of the allocated blocks. This method is not thread-safe.
-  GOOGLE_ATTRIBUTE_NOINLINE uint64 Reset();
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE uint64 Reset() {
+    // Call the reset hook
+    if (on_arena_reset_ != NULL) {
+      on_arena_reset_(this, hooks_cookie_, impl_.SpaceAllocated());
+    }
+    return impl_.Reset();
+  }
 
   // Adds |object| to a list of heap-allocated objects to be freed with |delete|
   // when the arena is destroyed or reset.
-  template <typename T> GOOGLE_ATTRIBUTE_NOINLINE
-  void Own(T* object) {
-    OwnInternal(object, google::protobuf::internal::is_convertible<T*, ::google::protobuf::Message*>());
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE void Own(T* object) {
+    OwnInternal(object, std::is_convertible<T*, Message*>());
   }
 
   // Adds |object| to a list of objects whose destructors will be manually
@@ -494,10 +389,10 @@ class LIBPROTOBUF_EXPORT Arena {
   // that it does not free the underlying memory with |delete|; hence, it is
   // normally only used for objects that are placement-newed into
   // arena-allocated memory.
-  template <typename T> GOOGLE_ATTRIBUTE_NOINLINE
-  void OwnDestructor(T* object) {
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE void OwnDestructor(T* object) {
     if (object != NULL) {
-      AddListNode(object, &internal::arena_destruct_object<T>);
+      impl_.AddCleanup(object, &internal::arena_destruct_object<T>);
     }
   }
 
@@ -505,313 +400,205 @@ class LIBPROTOBUF_EXPORT Arena {
   // will be manually called when the arena is destroyed or reset. This differs
   // from OwnDestructor() in that any member function may be specified, not only
   // the class destructor.
-  GOOGLE_ATTRIBUTE_NOINLINE void OwnCustomDestructor(void* object,
-                                              void (*destruct)(void*)) {
-    AddListNode(object, destruct);
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE void OwnCustomDestructor(
+      void* object, void (*destruct)(void*)) {
+    impl_.AddCleanup(object, destruct);
   }
 
   // Retrieves the arena associated with |value| if |value| is an arena-capable
   // message, or NULL otherwise. This differs from value->GetArena() in that the
   // latter is a virtual call, while this method is a templated call that
   // resolves at compile-time.
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static ::google::protobuf::Arena* GetArena(const T* value) {
-    return GetArenaInternal(value, static_cast<T*>(0));
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static Arena* GetArena(
+      const T* value) {
+    return GetArenaInternal(value, is_arena_constructable<T>());
   }
 
- private:
-  struct InternalIsArenaConstructableHelper {
-    template<typename U>
+  template <typename T>
+  class InternalHelper {
+    template <typename U>
+    static char DestructorSkippable(const typename U::DestructorSkippable_*);
+    template <typename U>
+    static double DestructorSkippable(...);
+
+    typedef std::integral_constant<
+        bool, sizeof(DestructorSkippable<T>(static_cast<const T*>(0))) ==
+                      sizeof(char) ||
+                  std::is_trivially_destructible<T>::value>
+        is_destructor_skippable;
+
+    template <typename U>
     static char ArenaConstructable(
         const typename U::InternalArenaConstructable_*);
-    template<typename U>
+    template <typename U>
     static double ArenaConstructable(...);
+
+    typedef std::integral_constant<bool, sizeof(ArenaConstructable<T>(
+                                             static_cast<const T*>(0))) ==
+                                             sizeof(char)>
+        is_arena_constructable;
+
+    template <typename... Args>
+    static T* Construct(void* ptr, Args&&... args) {
+      return new (ptr) T(std::forward<Args>(args)...);
+    }
+
+    static Arena* GetArena(const T* p) { return p->GetArenaNoVirtual(); }
+
+    friend class Arena;
   };
 
- public:
-  // Helper typetrait that indicates support for arenas in a type T at compile
+  // Helper typetraits that indicates support for arenas in a type T at compile
   // time. This is public only to allow construction of higher-level templated
-  // utilities. is_arena_constructable<T>::value is true if the message type T
-  // has arena support enabled, and false otherwise.
+  // utilities.
+  //
+  // is_arena_constructable<T>::value is true if the message type T has arena
+  // support enabled, and false otherwise.
+  //
+  // is_destructor_skippable<T>::value is true if the message type T has told
+  // the arena that it is safe to skip the destructor, and false otherwise.
   //
   // This is inside Arena because only Arena has the friend relationships
   // necessary to see the underlying generated code traits.
   template <typename T>
-  struct is_arena_constructable
-      : public google::protobuf::internal::integral_constant<
-            bool, sizeof(InternalIsArenaConstructableHelper::ArenaConstructable<
-                         const T>(static_cast<const T*>(0))) == sizeof(char)> {
+  struct is_arena_constructable : InternalHelper<T>::is_arena_constructable {};
+  template <typename T>
+  struct is_destructor_skippable : InternalHelper<T>::is_destructor_skippable {
   };
 
  private:
-  // Blocks are variable length malloc-ed objects.  The following structure
-  // describes the common header for all blocks.
-  struct Block {
-    void* owner;   // &ThreadCache of thread that owns this block, or
-                   // &this->owner if not yet owned by a thread.
-    Block* next;   // Next block in arena (may have different owner)
-    // ((char*) &block) + pos is next available byte. It is always
-    // aligned at a multiple of 8 bytes.
-    size_t pos;
-    size_t size;  // total size of the block.
-    GOOGLE_ATTRIBUTE_ALWAYS_INLINE size_t avail() const { return size - pos; }
-    // data follows
-  };
-
-  template<typename Type> friend class ::google::protobuf::internal::GenericTypeHandler;
-  friend class MockArena;              // For unit-testing.
-  friend class internal::ArenaString;  // For AllocateAligned.
-  friend class internal::LazyField;    // For CreateMaybeMessage.
-
-  struct ThreadCache {
-    // The ThreadCache is considered valid as long as this matches the
-    // lifecycle_id of the arena being used.
-    int64 last_lifecycle_id_seen;
-    Block* last_block_used_;
-  };
-
-  static const size_t kHeaderSize = sizeof(Block);
-  static google::protobuf::internal::SequenceNumber lifecycle_id_generator_;
-#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
-  // Android ndk does not support GOOGLE_THREAD_LOCAL keyword so we use a custom thread
-  // local storage class we implemented.
-  // iOS also does not support the GOOGLE_THREAD_LOCAL keyword.
-  static ThreadCache& thread_cache();
-#elif defined(PROTOBUF_USE_DLLS)
-  // Thread local variables cannot be exposed through DLL interface but we can
-  // wrap them in static functions.
-  static ThreadCache& thread_cache();
-#else
-  static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_;
-  static ThreadCache& thread_cache() { return thread_cache_; }
-#endif
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateMessageInternal(
+      Arena* arena, Args&&... args) {
+    static_assert(
+        InternalHelper<T>::is_arena_constructable::value,
+        "CreateMessage can only construct types that are ArenaConstructable");
+    if (arena == NULL) {
+      return new T(nullptr, std::forward<Args>(args)...);
+    } else {
+      return arena->DoCreateMessage<T>(std::forward<Args>(args)...);
+    }
+  }
 
-  // SFINAE for skipping addition to delete list for a message type when created
-  // with CreateMessage. This is mainly to skip proto2/proto1 message objects
-  // with cc_enable_arenas=true from being part of the delete list. Also, note,
-  // compiler will optimize out the branch in CreateInternal<T>.
-  template<typename T>
-  static inline bool SkipDeleteList(typename T::DestructorSkippable_*) {
-    return true;
+  // This specialization for no arguments is necessary, because its behavior is
+  // slightly different.  When the arena pointer is nullptr, it calls T()
+  // instead of T(nullptr).
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateMessageInternal(
+      Arena* arena) {
+    static_assert(
+        InternalHelper<T>::is_arena_constructable::value,
+        "CreateMessage can only construct types that are ArenaConstructable");
+    if (arena == NULL) {
+      return new T();
+    } else {
+      return arena->DoCreateMessage<T>();
+    }
   }
 
-  // For message objects that don't have the DestructorSkippable_ trait, we
-  // always add to the delete list.
-  template<typename T>
-  static inline bool SkipDeleteList(...) {
-    return google::protobuf::internal::has_trivial_destructor<T>::value;
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateInternal(
+      Arena* arena, Args&&... args) {
+    if (arena == NULL) {
+      return new T(std::forward<Args>(args)...);
+    } else {
+      return arena->DoCreate<T>(std::is_trivially_destructible<T>::value,
+                                std::forward<Args>(args)...);
+    }
   }
 
- private:
-  struct InternalIsDestructorSkippableHelper {
-    template<typename U>
-    static char DestructorSkippable(
-        const typename U::DestructorSkippable_*);
-    template<typename U>
-    static double DestructorSkippable(...);
-  };
+  void CallDestructorHooks();
+  void OnArenaAllocation(const std::type_info* allocated_type, size_t n) const;
+  inline void AllocHook(const std::type_info* allocated_type, size_t n) const {
+    if (GOOGLE_PREDICT_FALSE(hooks_cookie_ != NULL)) {
+      OnArenaAllocation(allocated_type, n);
+    }
+  }
 
- public:
-  // Helper typetrait that indicates whether the desctructor of type T should be
-  // called when arena is destroyed at compile time. This is only to allow
-  // construction of higher-level templated utilities.
-  // is_destructor_skippable<T>::value is true if the destructor of the message
-  // type T should not be called when arena is destroyed or false otherwise.
-  // This is inside Arena because only Arena has the friend relationships
-  // necessary to see the underlying generated code traits.
-  template<typename T>
-  struct is_destructor_skippable
-      : public google::protobuf::internal::integral_constant<
-            bool,
-            sizeof(InternalIsDestructorSkippableHelper::DestructorSkippable<
-                   const T>(static_cast<const T*>(0))) == sizeof(char) ||
-                google::protobuf::internal::has_trivial_destructor<T>::value> {};
+  // Allocate and also optionally call on_arena_allocation callback with the
+  // allocated type info when the hooks are in place in ArenaOptions and
+  // the cookie is not null.
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void* AllocateInternal(
+      bool skip_explicit_ownership) {
+    const size_t n = internal::AlignUpTo8(sizeof(T));
+    AllocHook(RTTI_TYPE_ID(T), n);
+    // Monitor allocation if needed.
+    if (skip_explicit_ownership) {
+      return impl_.AllocateAligned(n);
+    } else {
+      return impl_.AllocateAlignedAndAddCleanup(
+          n, &internal::arena_destruct_object<T>);
+    }
+  }
 
- private:
   // CreateMessage<T> requires that T supports arenas, but this private method
   // works whether or not T supports arenas. These are not exposed to user code
   // as it can cause confusing API usages, and end up having double free in
   // user code. These are used only internally from LazyField and Repeated
   // fields, since they are designed to work in all mode combinations.
-  template<typename Msg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static Msg* CreateMaybeMessage(
-      Arena* arena, typename Msg::InternalArenaConstructable_*) {
-    return CreateMessage<Msg>(arena);
-  }
-
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static T* CreateMaybeMessage(Arena* arena, ...) {
-    return Create<T>(arena);
-  }
-
-  // Just allocate the required size for the given type assuming the
-  // type has a trivial constructor.
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateInternalRawArray(size_t num_elements) {
-    GOOGLE_CHECK_LE(num_elements,
-             std::numeric_limits<size_t>::max() / sizeof(T))
-        << "Requested size is too large to fit into size_t.";
-    return static_cast<T*>(
-        AllocateAligned(RTTI_TYPE_ID(T), sizeof(T) * num_elements));
+  template <typename Msg, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static Msg* DoCreateMaybeMessage(
+      Arena* arena, std::true_type, Args&&... args) {
+    return CreateMessageInternal<Msg>(arena, std::forward<Args>(args)...);
   }
 
-  template <typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateInternal(bool skip_explicit_ownership) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T))) T();
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* DoCreateMaybeMessage(
+      Arena* arena, std::false_type, Args&&... args) {
+    return CreateInternal<T>(arena, std::forward<Args>(args)...);
   }
 
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateInternal(bool skip_explicit_ownership, const Arg& arg) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T))) T(arg);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateMaybeMessage(
+      Arena* arena, Args&&... args) {
+    return DoCreateMaybeMessage<T>(arena, is_arena_constructable<T>(),
+                                   std::forward<Args>(args)...);
   }
 
-#if LANG_CXX11
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateInternal(bool skip_explicit_ownership, Arg&& arg) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T))) T(
-        std::move(arg));
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateNoMessage(
+      Arena* arena, std::true_type, Args&&... args) {
+    // User is constructing with Create() despite the fact that T supports arena
+    // construction.  In this case we have to delegate to CreateInternal(), and
+    // we can't use any CreateMaybeMessage() specialization that may be defined.
+    return CreateInternal<T>(arena, std::forward<Args>(args)...);
   }
-#endif
 
-  template <typename T, typename Arg1, typename Arg2> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateInternal(
-      bool skip_explicit_ownership, const Arg1& arg1, const Arg2& arg2) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T))) T(arg1, arg2);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3,
-                                            const Arg4& arg4) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3, arg4);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3,
-                                            const Arg4& arg4,
-                                            const Arg5& arg5) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3, arg4, arg5);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3,
-                                            const Arg4& arg4,
-                                            const Arg5& arg5,
-                                            const Arg6& arg6) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3, arg4, arg5, arg6);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6, typename Arg7>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3,
-                                            const Arg4& arg4,
-                                            const Arg5& arg5,
-                                            const Arg6& arg6,
-                                            const Arg7& arg7) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
-  }
-
-  template <typename T, typename Arg1, typename Arg2, typename Arg3,
-            typename Arg4, typename Arg5, typename Arg6, typename Arg7,
-            typename Arg8>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* CreateInternal(bool skip_explicit_ownership,
-                                            const Arg1& arg1,
-                                            const Arg2& arg2,
-                                            const Arg3& arg3,
-                                            const Arg4& arg4,
-                                            const Arg5& arg5,
-                                            const Arg6& arg6,
-                                            const Arg7& arg7,
-                                            const Arg8& arg8) {
-    T* t = new (AllocateAligned(RTTI_TYPE_ID(T), sizeof(T)))
-        T(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
-    if (!skip_explicit_ownership) {
-      AddListNode(t, &internal::arena_destruct_object<T>);
-    }
-    return t;
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static T* CreateNoMessage(
+      Arena* arena, std::false_type, Args&&... args) {
+    // User is constructing with Create() and the type does not support arena
+    // construction.  In this case we can delegate to CreateMaybeMessage() and
+    // use any specialization that may be available for that.
+    return CreateMaybeMessage<T>(arena, std::forward<Args>(args)...);
   }
 
-  template <typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateMessageInternal(typename T::InternalArenaConstructable_*) {
-    return CreateInternal<T, Arena*>(SkipDeleteList<T>(static_cast<T*>(0)),
-                                     this);
+  // Just allocate the required size for the given type assuming the
+  // type has a trivial constructor.
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE T* CreateInternalRawArray(
+      size_t num_elements) {
+    GOOGLE_CHECK_LE(num_elements, std::numeric_limits<size_t>::max() / sizeof(T))
+        << "Requested size is too large to fit into size_t.";
+    const size_t n = internal::AlignUpTo8(sizeof(T) * num_elements);
+    // Monitor allocation if needed.
+    AllocHook(RTTI_TYPE_ID(T), n);
+    return static_cast<T*>(impl_.AllocateAligned(n));
   }
 
-  template <typename T, typename Arg> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateMessageInternal(typename T::InternalArenaConstructable_*,
-                           const Arg& arg) {
-    return CreateInternal<T, Arena*>(SkipDeleteList<T>(static_cast<T*>(0)),
-                                     this, arg);
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE T* DoCreate(
+      bool skip_explicit_ownership, Args&&... args) {
+    return new (AllocateInternal<T>(skip_explicit_ownership))
+        T(std::forward<Args>(args)...);
   }
-
-  template <typename T, typename Arg1, typename Arg2> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  T* CreateMessageInternal(typename T::InternalArenaConstructable_*,
-                           const Arg1& arg1, const Arg2& arg2) {
-    return CreateInternal<T, Arena*>(SkipDeleteList<T>(static_cast<T*>(0)),
-                                     this, arg1, arg2);
+  template <typename T, typename... Args>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE T* DoCreateMessage(Args&&... args) {
+    return InternalHelper<T>::Construct(
+        AllocateInternal<T>(InternalHelper<T>::is_destructor_skippable::value),
+        this, std::forward<Args>(args)...);
   }
 
   // CreateInArenaStorage is used to implement map field. Without it,
@@ -821,27 +608,28 @@ class LIBPROTOBUF_EXPORT Arena {
   static void CreateInArenaStorage(T* ptr, Arena* arena) {
     CreateInArenaStorageInternal(ptr, arena,
                                  typename is_arena_constructable<T>::type());
-    RegisterDestructorInternal(ptr, arena,
-                               typename is_destructor_skippable<T>::type());
+    RegisterDestructorInternal(
+        ptr, arena,
+        typename InternalHelper<T>::is_destructor_skippable::type());
   }
 
   template <typename T>
-  static void CreateInArenaStorageInternal(
-      T* ptr, Arena* arena, google::protobuf::internal::true_type) {
-    new (ptr) T(arena);
+  static void CreateInArenaStorageInternal(T* ptr, Arena* arena,
+                                           std::true_type) {
+    InternalHelper<T>::Construct(ptr, arena);
   }
   template <typename T>
-  static void CreateInArenaStorageInternal(
-      T* ptr, Arena* arena, google::protobuf::internal::false_type) {
+  static void CreateInArenaStorageInternal(T* ptr, Arena* /* arena */,
+                                           std::false_type) {
     new (ptr) T();
   }
 
   template <typename T>
-  static void RegisterDestructorInternal(
-      T* ptr, Arena* arena, google::protobuf::internal::true_type) {}
+  static void RegisterDestructorInternal(T* /* ptr */, Arena* /* arena */,
+                                         std::true_type) {}
   template <typename T>
-  static void RegisterDestructorInternal(
-      T* ptr, Arena* arena, google::protobuf::internal::false_type) {
+  static void RegisterDestructorInternal(T* ptr, Arena* arena,
+                                         std::false_type) {
     arena->OwnDestructor(ptr);
   }
 
@@ -850,103 +638,60 @@ class LIBPROTOBUF_EXPORT Arena {
   // is a subtype of ::google::protobuf::Message and 'false_type' otherwise. Collapsing
   // all template instantiations to one for generic Message reduces code size,
   // using the virtual destructor instead.
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  void OwnInternal(T* object, google::protobuf::internal::true_type) {
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void OwnInternal(T* object,
+                                                           std::true_type) {
     if (object != NULL) {
-      AddListNode(object, &internal::arena_delete_object< ::google::protobuf::Message >);
+      impl_.AddCleanup(object, &internal::arena_delete_object<Message>);
     }
   }
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  void OwnInternal(T* object, google::protobuf::internal::false_type) {
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void OwnInternal(T* object,
+                                                           std::false_type) {
     if (object != NULL) {
-      AddListNode(object, &internal::arena_delete_object<T>);
+      impl_.AddCleanup(object, &internal::arena_delete_object<T>);
     }
   }
 
   // Implementation for GetArena(). Only message objects with
   // InternalArenaConstructable_ tags can be associated with an arena, and such
   // objects must implement a GetArenaNoVirtual() method.
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static ::google::protobuf::Arena* GetArenaInternal(
-      const T* value, typename T::InternalArenaConstructable_*) {
-    return value->GetArenaNoVirtual();
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static Arena* GetArenaInternal(
+      const T* value, std::true_type) {
+    return InternalHelper<T>::GetArena(value);
   }
 
-  template<typename T> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static ::google::protobuf::Arena* GetArenaInternal(const T* value, ...) {
+  template <typename T>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static Arena* GetArenaInternal(
+      const T* /* value */, std::false_type) {
     return NULL;
   }
 
-  // Allocate and also optionally call on_arena_allocation callback with the
-  // allocated type info when the hooks are in place in ArenaOptions and
-  // the cookie is not null.
-  void* AllocateAligned(const std::type_info* allocated, size_t n);
-
-  // Allocate an internal allocation, avoiding optional typed monitoring.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void* AllocateAligned(size_t n) {
-    return AllocateAligned(NULL, n);
-  }
-
-  void Init();
-
-  // Free all blocks and return the total space used which is the sums of sizes
-  // of the all the allocated blocks.
-  uint64 FreeBlocks();
-
-  // Add object pointer and cleanup function pointer to the list.
-  // TODO(rohananil, cfallin): We could pass in a sub-arena into this method
-  // to avoid polluting blocks of this arena with list nodes. This would help in
-  // mixed mode (where many protobufs have cc_enable_arenas=false), and is an
-  // alternative to a chunked linked-list, but with extra overhead of *next.
-  void AddListNode(void* elem, void (*cleanup)(void*));
-  // Delete or Destruct all objects owned by the arena.
-  void CleanupList();
-  uint64 ResetInternal();
-
-  inline void SetThreadCacheBlock(Block* block) {
-    thread_cache().last_block_used_ = block;
-    thread_cache().last_lifecycle_id_seen = lifecycle_id_;
+  // For friends of arena.
+  void* AllocateAligned(size_t n) {
+    AllocHook(NULL, n);
+    return impl_.AllocateAligned(internal::AlignUpTo8(n));
   }
 
-  int64 lifecycle_id_;  // Unique for each arena. Changes on Reset().
-
-  google::protobuf::internal::AtomicWord blocks_;       // Head of linked list of all allocated blocks
-  google::protobuf::internal::AtomicWord hint_;         // Fast thread-local block access
-  uint64 space_allocated_;  // Sum of sizes of all allocated blocks.
+  internal::ArenaImpl impl_;
 
-  // Node contains the ptr of the object to be cleaned up and the associated
-  // cleanup function ptr.
-  struct Node {
-    void* elem;              // Pointer to the object to be cleaned up.
-    void (*cleanup)(void*);  // Function pointer to the destructor or deleter.
-    Node* next;              // Next node in the list.
-  };
-
-  google::protobuf::internal::AtomicWord cleanup_list_;  // Head of a linked list of nodes containing object
-                             // ptrs and cleanup methods.
-
-  bool owns_first_block_;    // Indicates that arena owns the first block
-  mutable Mutex blocks_lock_;
-
-  void AddBlock(Block* b);
-  // Access must be synchronized, either by blocks_lock_ or by being called from
-  // Init()/Reset().
-  void AddBlockInternal(Block* b);
-  void* SlowAlloc(size_t n);
-  Block* FindBlock(void* me);
-  Block* NewBlock(void* me, Block* my_last_block, size_t n,
-                  size_t start_block_size, size_t max_block_size);
-  static void* AllocFromBlock(Block* b, size_t n);
-  template <typename Key, typename T>
-  friend class Map;
+  void (*on_arena_allocation_)(const std::type_info* allocated_type,
+                               uint64 alloc_size, void* cookie);
+  void (*on_arena_reset_)(Arena* arena, void* cookie, uint64 space_used);
+  void (*on_arena_destruction_)(Arena* arena, void* cookie, uint64 space_used);
 
   // The arena may save a cookie it receives from the external on_init hook
   // and then use it when calling the on_reset and on_destruction hooks.
   void* hooks_cookie_;
 
-  ArenaOptions options_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Arena);
+  template <typename Type>
+  friend class internal::GenericTypeHandler;
+  friend struct internal::ArenaStringPtr;  // For AllocateAligned.
+  friend class internal::LazyField;        // For CreateMaybeMessage.
+  friend class MessageLite;
+  template <typename Key, typename T>
+  friend class Map;
 };
 
 // Defined above for supporting environments without RTTI.
diff --git a/src/google/protobuf/arena_impl.h b/src/google/protobuf/arena_impl.h
new file mode 100644
index 00000000..f648f166
--- /dev/null
+++ b/src/google/protobuf/arena_impl.h
@@ -0,0 +1,321 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This file defines an Arena allocator for better allocation performance.
+
+#ifndef GOOGLE_PROTOBUF_ARENA_IMPL_H__
+#define GOOGLE_PROTOBUF_ARENA_IMPL_H__
+
+#include <atomic>
+#include <limits>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+
+#include <google/protobuf/stubs/port.h>
+
+#ifdef ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#endif  // ADDRESS_SANITIZER
+
+namespace google {
+
+namespace protobuf {
+namespace internal {
+
+inline size_t AlignUpTo8(size_t n) {
+  // Align n to next multiple of 8 (from Hacker's Delight, Chapter 3.)
+  return (n + 7) & -8;
+}
+
+// This class provides the core Arena memory allocation library. Different
+// implementations only need to implement the public interface below.
+// Arena is not a template type as that would only be useful if all protos
+// in turn would be templates, which will/cannot happen. However separating
+// the memory allocation part from the cruft of the API users expect we can
+// use #ifdef the select the best implementation based on hardware / OS.
+class LIBPROTOBUF_EXPORT ArenaImpl {
+ public:
+  struct Options {
+    size_t start_block_size;
+    size_t max_block_size;
+    char* initial_block;
+    size_t initial_block_size;
+    void* (*block_alloc)(size_t);
+    void (*block_dealloc)(void*, size_t);
+
+    template <typename O>
+    explicit Options(const O& options)
+      : start_block_size(options.start_block_size),
+        max_block_size(options.max_block_size),
+        initial_block(options.initial_block),
+        initial_block_size(options.initial_block_size),
+        block_alloc(options.block_alloc),
+        block_dealloc(options.block_dealloc) {}
+  };
+
+  template <typename O>
+  explicit ArenaImpl(const O& options) : options_(options) {
+    if (options_.initial_block != NULL && options_.initial_block_size > 0) {
+      GOOGLE_CHECK_GE(options_.initial_block_size, sizeof(Block))
+          << ": Initial block size too small for header.";
+      initial_block_ = reinterpret_cast<Block*>(options_.initial_block);
+    } else {
+      initial_block_ = NULL;
+    }
+
+    Init();
+  }
+
+  // Destructor deletes all owned heap allocated objects, and destructs objects
+  // that have non-trivial destructors, except for proto2 message objects whose
+  // destructors can be skipped. Also, frees all blocks except the initial block
+  // if it was passed in.
+  ~ArenaImpl();
+
+  uint64 Reset();
+
+  uint64 SpaceAllocated() const;
+  uint64 SpaceUsed() const;
+
+  void* AllocateAligned(size_t n);
+
+  void* AllocateAlignedAndAddCleanup(size_t n, void (*cleanup)(void*));
+
+  // Add object pointer and cleanup function pointer to the list.
+  void AddCleanup(void* elem, void (*cleanup)(void*));
+
+ private:
+  void* AllocateAlignedFallback(size_t n);
+  void* AllocateAlignedAndAddCleanupFallback(size_t n, void (*cleanup)(void*));
+  void AddCleanupFallback(void* elem, void (*cleanup)(void*));
+
+  // Node contains the ptr of the object to be cleaned up and the associated
+  // cleanup function ptr.
+  struct CleanupNode {
+    void* elem;              // Pointer to the object to be cleaned up.
+    void (*cleanup)(void*);  // Function pointer to the destructor or deleter.
+  };
+
+  // Cleanup uses a chunked linked list, to reduce pointer chasing.
+  struct CleanupChunk {
+    static size_t SizeOf(size_t i) {
+      return sizeof(CleanupChunk) + (sizeof(CleanupNode) * (i - 1));
+    }
+    size_t size;           // Total elements in the list.
+    CleanupChunk* next;    // Next node in the list.
+    CleanupNode nodes[1];  // True length is |size|.
+  };
+
+  class Block;
+
+  // A thread-unsafe Arena that can only be used within its owning thread.
+  class LIBPROTOBUF_EXPORT SerialArena {
+   public:
+    // The allocate/free methods here are a little strange, since SerialArena is
+    // allocated inside a Block which it also manages.  This is to avoid doing
+    // an extra allocation for the SerialArena itself.
+
+    // Creates a new SerialArena inside Block* and returns it.
+    static SerialArena* New(Block* b, void* owner, ArenaImpl* arena);
+
+    // Destroys this SerialArena, freeing all blocks with the given dealloc
+    // function, except any block equal to |initial_block|.
+    static uint64 Free(SerialArena* serial, Block* initial_block,
+                       void (*block_dealloc)(void*, size_t));
+
+    void CleanupList();
+    uint64 SpaceUsed() const;
+
+    void* AllocateAligned(size_t n) {
+      GOOGLE_DCHECK_EQ(internal::AlignUpTo8(n), n);  // Must be already aligned.
+      GOOGLE_DCHECK_GE(limit_, ptr_);
+      if (GOOGLE_PREDICT_FALSE(static_cast<size_t>(limit_ - ptr_) < n)) {
+        return AllocateAlignedFallback(n);
+      }
+      void* ret = ptr_;
+      ptr_ += n;
+#ifdef ADDRESS_SANITIZER
+      ASAN_UNPOISON_MEMORY_REGION(ret, n);
+#endif  // ADDRESS_SANITIZER
+      return ret;
+    }
+
+    void AddCleanup(void* elem, void (*cleanup)(void*)) {
+      if (GOOGLE_PREDICT_FALSE(cleanup_ptr_ == cleanup_limit_)) {
+        AddCleanupFallback(elem, cleanup);
+        return;
+      }
+      cleanup_ptr_->elem = elem;
+      cleanup_ptr_->cleanup = cleanup;
+      cleanup_ptr_++;
+    }
+
+    void* AllocateAlignedAndAddCleanup(size_t n, void (*cleanup)(void*)) {
+      void* ret = AllocateAligned(n);
+      AddCleanup(ret, cleanup);
+      return ret;
+    }
+
+    void* owner() const { return owner_; }
+    SerialArena* next() const { return next_; }
+    void set_next(SerialArena* next) { next_ = next; }
+
+   private:
+    void* AllocateAlignedFallback(size_t n);
+    void AddCleanupFallback(void* elem, void (*cleanup)(void*));
+    void CleanupListFallback();
+
+    ArenaImpl* arena_;        // Containing arena.
+    void* owner_;             // &ThreadCache of this thread;
+    Block* head_;             // Head of linked list of blocks.
+    CleanupChunk* cleanup_;   // Head of cleanup list.
+    SerialArena* next_;       // Next SerialArena in this linked list.
+
+    // Next pointer to allocate from.  Always 8-byte aligned.  Points inside
+    // head_ (and head_->pos will always be non-canonical).  We keep these
+    // here to reduce indirection.
+    char* ptr_;
+    char* limit_;
+
+    // Next CleanupList members to append to.  These point inside cleanup_.
+    CleanupNode* cleanup_ptr_;
+    CleanupNode* cleanup_limit_;
+  };
+
+  // Blocks are variable length malloc-ed objects.  The following structure
+  // describes the common header for all blocks.
+  class LIBPROTOBUF_EXPORT Block {
+   public:
+    Block(size_t size, Block* next);
+
+    char* Pointer(size_t n) {
+      GOOGLE_DCHECK(n <= size_);
+      return reinterpret_cast<char*>(this) + n;
+    }
+
+    Block* next() const { return next_; }
+    size_t pos() const { return pos_; }
+    size_t size() const { return size_; }
+    void set_pos(size_t pos) { pos_ = pos; }
+
+   private:
+    Block* next_;   // Next block for this thread.
+    size_t pos_;
+    size_t size_;
+    // data follows
+  };
+
+  struct ThreadCache {
+#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
+    // If we are using the ThreadLocalStorage class to store the ThreadCache,
+    // then the ThreadCache's default constructor has to be responsible for
+    // initializing it.
+    ThreadCache() : last_lifecycle_id_seen(-1), last_serial_arena(NULL) {}
+#endif
+
+    // The ThreadCache is considered valid as long as this matches the
+    // lifecycle_id of the arena being used.
+    int64 last_lifecycle_id_seen;
+    SerialArena* last_serial_arena;
+  };
+  static std::atomic<int64> lifecycle_id_generator_;
+#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
+  // Android ndk does not support GOOGLE_THREAD_LOCAL keyword so we use a custom thread
+  // local storage class we implemented.
+  // iOS also does not support the GOOGLE_THREAD_LOCAL keyword.
+  static ThreadCache& thread_cache();
+#elif defined(PROTOBUF_USE_DLLS)
+  // Thread local variables cannot be exposed through DLL interface but we can
+  // wrap them in static functions.
+  static ThreadCache& thread_cache();
+#else
+  static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_;
+  static ThreadCache& thread_cache() { return thread_cache_; }
+#endif
+
+  void Init();
+
+  // Free all blocks and return the total space used which is the sums of sizes
+  // of the all the allocated blocks.
+  uint64 FreeBlocks();
+  // Delete or Destruct all objects owned by the arena.
+  void CleanupList();
+
+  inline void CacheSerialArena(SerialArena* serial) {
+    thread_cache().last_serial_arena = serial;
+    thread_cache().last_lifecycle_id_seen = lifecycle_id_;
+    // TODO(haberman): evaluate whether we would gain efficiency by getting rid
+    // of hint_.  It's the only write we do to ArenaImpl in the allocation path,
+    // which will dirty the cache line.
+
+    hint_.store(serial, std::memory_order_release);
+  }
+
+
+  std::atomic<SerialArena*>
+      threads_;                     // Pointer to a linked list of SerialArena.
+  std::atomic<SerialArena*> hint_;  // Fast thread-local block access
+  std::atomic<size_t> space_allocated_;  // Total size of all allocated blocks.
+
+  Block *initial_block_;     // If non-NULL, points to the block that came from
+                             // user data.
+
+  Block* NewBlock(Block* last_block, size_t min_bytes);
+
+  SerialArena* GetSerialArena();
+  bool GetSerialArenaFast(SerialArena** arena);
+  SerialArena* GetSerialArenaFallback(void* me);
+  int64 lifecycle_id_;  // Unique for each arena. Changes on Reset().
+
+  Options options_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ArenaImpl);
+  // All protos have pointers back to the arena hence Arena must have
+  // pointer stability.
+  ArenaImpl(ArenaImpl&&) = delete;
+  ArenaImpl& operator=(ArenaImpl&&) = delete;
+
+ public:
+  // kBlockHeaderSize is sizeof(Block), aligned up to the nearest multiple of 8
+  // to protect the invariant that pos is always at a multiple of 8.
+  static const size_t kBlockHeaderSize = (sizeof(Block) + 7) & -8;
+  static const size_t kSerialArenaSize = (sizeof(SerialArena) + 7) & -8;
+  static_assert(kBlockHeaderSize % 8 == 0,
+                "kBlockHeaderSize must be a multiple of 8.");
+  static_assert(kSerialArenaSize % 8 == 0,
+                "kSerialArenaSize must be a multiple of 8.");
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_ARENA_IMPL_H__
diff --git a/src/google/protobuf/arena_test_util.h b/src/google/protobuf/arena_test_util.h
index 8c9f7698..df56ece8 100644
--- a/src/google/protobuf/arena_test_util.h
+++ b/src/google/protobuf/arena_test_util.h
@@ -50,7 +50,7 @@ void TestParseCorruptedString(const T& message) {
       s[i] ^= c;
       google::protobuf::Arena arena;
       T* message =
-          google::protobuf::Arena::CreateMessage<T>(use_arena ? &arena : NULL);
+          google::protobuf::Arena::CreateMessage<T>(use_arena ? &arena : nullptr);
       if (message->ParseFromString(s)) {
         ++success_count;
       }
diff --git a/src/google/protobuf/arena_unittest.cc b/src/google/protobuf/arena_unittest.cc
index 4f9571db..eaaffce2 100644
--- a/src/google/protobuf/arena_unittest.cc
+++ b/src/google/protobuf/arena_unittest.cc
@@ -33,10 +33,8 @@
 #include <algorithm>
 #include <cstring>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
+#include <type_traits>
 #include <typeinfo>
 #include <vector>
 
@@ -67,7 +65,6 @@ using protobuf_unittest::TestOneof2;
 using protobuf_unittest::TestEmptyMessage;
 
 namespace protobuf {
-namespace {
 
 class Notifier {
  public:
@@ -154,9 +151,19 @@ class MustBeConstructedWithOneThroughEight {
 TEST(ArenaTest, ArenaConstructable) {
   EXPECT_TRUE(Arena::is_arena_constructable<TestAllTypes>::type::value);
   EXPECT_TRUE(Arena::is_arena_constructable<const TestAllTypes>::type::value);
+  EXPECT_FALSE(Arena::is_arena_constructable<
+               protobuf_unittest_no_arena::TestNoArenaMessage>::type::value);
   EXPECT_FALSE(Arena::is_arena_constructable<Arena>::type::value);
 }
 
+TEST(ArenaTest, DestructorSkippable) {
+  EXPECT_TRUE(Arena::is_destructor_skippable<TestAllTypes>::type::value);
+  EXPECT_TRUE(Arena::is_destructor_skippable<const TestAllTypes>::type::value);
+  EXPECT_FALSE(Arena::is_destructor_skippable<
+               protobuf_unittest_no_arena::TestNoArenaMessage>::type::value);
+  EXPECT_FALSE(Arena::is_destructor_skippable<Arena>::type::value);
+}
+
 TEST(ArenaTest, BasicCreate) {
   Arena arena;
   EXPECT_TRUE(Arena::Create<int32>(&arena) != NULL);
@@ -180,6 +187,33 @@ TEST(ArenaTest, BasicCreate) {
   EXPECT_EQ(2, notifier.GetCount());
 }
 
+TEST(ArenaTest, CreateAndConstCopy) {
+  Arena arena;
+  const string s("foo");
+  const string* s_copy = Arena::Create<string>(&arena, s);
+  EXPECT_TRUE(s_copy != NULL);
+  EXPECT_EQ("foo", s);
+  EXPECT_EQ("foo", *s_copy);
+}
+
+TEST(ArenaTest, CreateAndNonConstCopy) {
+  Arena arena;
+  string s("foo");
+  const string* s_copy = Arena::Create<string>(&arena, s);
+  EXPECT_TRUE(s_copy != NULL);
+  EXPECT_EQ("foo", s);
+  EXPECT_EQ("foo", *s_copy);
+}
+
+TEST(ArenaTest, CreateAndMove) {
+  Arena arena;
+  string s("foo");
+  const string* s_move = Arena::Create<string>(&arena, std::move(s));
+  EXPECT_TRUE(s_move != NULL);
+  EXPECT_TRUE(s.empty());  // NOLINT
+  EXPECT_EQ("foo", *s_move);
+}
+
 TEST(ArenaTest, CreateWithFourConstructorArguments) {
   Arena arena;
   const string three("3");
@@ -214,11 +248,32 @@ TEST(ArenaTest, CreateWithEightConstructorArguments) {
   ASSERT_EQ("8", new_object->eight_);
 }
 
+class PleaseMoveMe {
+ public:
+  explicit PleaseMoveMe(const string& value) : value_(value) {}
+  PleaseMoveMe(PleaseMoveMe&&) = default;
+  PleaseMoveMe(const PleaseMoveMe&) = delete;
+
+  const string& value() const { return value_; }
+
+ private:
+  string value_;
+};
+
+TEST(ArenaTest, CreateWithMoveArguments) {
+  Arena arena;
+  PleaseMoveMe one("1");
+  const PleaseMoveMe* new_object =
+      Arena::Create<PleaseMoveMe>(&arena, std::move(one));
+  EXPECT_TRUE(new_object);
+  ASSERT_EQ("1", new_object->value());
+}
+
 TEST(ArenaTest, InitialBlockTooSmall) {
   // Construct a small (64 byte) initial block of memory to be used by the
   // arena allocator; then, allocate an object which will not fit in the
   // initial block.
-  std::vector<char> arena_block(64);
+  std::vector<char> arena_block(96);
   ArenaOptions options;
   options.initial_block = &arena_block[0];
   options.initial_block_size = arena_block.size();
@@ -391,7 +446,7 @@ TEST(ArenaTest, ReflectionSwapFields) {
   TestUtil::SetAllFields(arena1_message);
   reflection->SwapFields(arena1_message, &message, fields);
   EXPECT_EQ(&arena1, arena1_message->GetArena());
-  EXPECT_EQ(NULL, message.GetArena());
+  EXPECT_EQ(nullptr, message.GetArena());
   arena1_message->SerializeToString(&output);
   EXPECT_EQ(0, output.size());
   TestUtil::ExpectAllFieldsSet(message);
@@ -417,7 +472,7 @@ TEST(ArenaTest, ReleaseMessage) {
   Arena arena;
   TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
   arena_message->mutable_optional_nested_message()->set_bb(118);
-  google::protobuf::scoped_ptr<TestAllTypes::NestedMessage> nested(
+  std::unique_ptr<TestAllTypes::NestedMessage> nested(
       arena_message->release_optional_nested_message());
   EXPECT_EQ(118, nested->bb());
 
@@ -438,7 +493,7 @@ TEST(ArenaTest, ReleaseString) {
   Arena arena;
   TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
   arena_message->set_optional_string("hello");
-  google::protobuf::scoped_ptr<string> released_str(
+  std::unique_ptr<string> released_str(
       arena_message->release_optional_string());
   EXPECT_EQ("hello", *released_str);
 
@@ -549,25 +604,6 @@ TEST(ArenaTest, ReleaseFromArenaMessageUsingReflectionMakesCopy) {
 }
 #endif  // !GOOGLE_PROTOBUF_NO_RTTI
 
-TEST(ArenaTest, UnsafeArenaReleaseDoesNotMakeCopy) {
-  Arena arena;
-  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
-  TestAllTypes::NestedMessage* nested_msg = NULL;
-  TestAllTypes::NestedMessage* orig_nested_msg = NULL;
-  string* nested_string = NULL;
-  string* orig_nested_string = NULL;
-  arena_message->mutable_optional_nested_message()->set_bb(42);
-  *arena_message->mutable_optional_string() = "Hello";
-  orig_nested_msg = arena_message->mutable_optional_nested_message();
-  orig_nested_string = arena_message->mutable_optional_string();
-  nested_msg = arena_message->unsafe_arena_release_optional_nested_message();
-  nested_string = arena_message->unsafe_arena_release_optional_string();
-
-  EXPECT_EQ(orig_nested_msg, nested_msg);
-  EXPECT_EQ(orig_nested_string, nested_string);
-  // Released pointers still on arena; no 'delete' calls needed here.
-}
-
 TEST(ArenaTest, SetAllocatedAcrossArenas) {
   Arena arena1;
   TestAllTypes* arena1_message = Arena::CreateMessage<TestAllTypes>(&arena1);
@@ -847,17 +883,18 @@ TEST(ArenaTest, ReleaseLastRepeatedField) {
 TEST(ArenaTest, UnsafeArenaReleaseAdd) {
   // Use unsafe_arena_release() and unsafe_arena_set_allocated() to transfer an
   // arena-allocated string from one message to another.
+  const char kContent[] = "Test content";
+
   Arena arena;
   TestAllTypes* message1 = Arena::CreateMessage<TestAllTypes>(&arena);
   TestAllTypes* message2 = Arena::CreateMessage<TestAllTypes>(&arena);
   string* arena_string = Arena::Create<string>(&arena);
-  *arena_string = "Test content";
+  *arena_string = kContent;
 
   message1->unsafe_arena_set_allocated_optional_string(arena_string);
-  EXPECT_EQ(arena_string, message1->mutable_optional_string());
   message2->unsafe_arena_set_allocated_optional_string(
       message1->unsafe_arena_release_optional_string());
-  EXPECT_EQ(arena_string, message2->mutable_optional_string());
+  EXPECT_EQ(kContent, message2->optional_string());
 }
 
 TEST(ArenaTest, UnsafeArenaAddAllocated) {
@@ -1247,12 +1284,12 @@ TEST(ArenaTest, SpaceAllocated_and_Used) {
   options.initial_block_size = 0;
   Arena arena_3(options);
   EXPECT_EQ(0, arena_3.SpaceUsed());
-  ::google::protobuf::Arena::CreateArray<char>(&arena_3, 190);
+  ::google::protobuf::Arena::CreateArray<char>(&arena_3, 160);
   EXPECT_EQ(256, arena_3.SpaceAllocated());
-  EXPECT_EQ(Align8(190), arena_3.SpaceUsed());
+  EXPECT_EQ(Align8(160), arena_3.SpaceUsed());
   ::google::protobuf::Arena::CreateArray<char>(&arena_3, 70);
   EXPECT_EQ(256 + 512, arena_3.SpaceAllocated());
-  EXPECT_EQ(Align8(190) + Align8(70), arena_3.SpaceUsed());
+  EXPECT_EQ(Align8(160) + Align8(70), arena_3.SpaceUsed());
   EXPECT_EQ(256 + 512, arena_3.Reset());
 }
 
@@ -1295,6 +1332,13 @@ TEST(ArenaTest, GetArenaShouldReturnNullForNonArenaAllocatedMessages) {
   EXPECT_EQ(NULL, Arena::GetArena(const_pointer_to_message));
 }
 
+TEST(ArenaTest, AddCleanup) {
+  ::google::protobuf::Arena arena;
+  for (int i = 0; i < 100; i++) {
+    arena.Own(new int);
+  }
+}
+
 TEST(ArenaTest, UnsafeSetAllocatedOnArena) {
   ::google::protobuf::Arena arena;
   TestAllTypes* message = Arena::CreateMessage<TestAllTypes>(&arena);
@@ -1353,13 +1397,20 @@ uint32 ArenaHooksTestUtil::num_reset = 0;
 uint32 ArenaHooksTestUtil::num_destruct = 0;
 const int ArenaHooksTestUtil::kCookieValue;
 
+class ArenaOptionsTestFriend {
+ public:
+  static void Set(::google::protobuf::ArenaOptions* options) {
+    options->on_arena_init = ArenaHooksTestUtil::on_init;
+    options->on_arena_allocation = ArenaHooksTestUtil::on_allocation;
+    options->on_arena_reset = ArenaHooksTestUtil::on_reset;
+    options->on_arena_destruction = ArenaHooksTestUtil::on_destruction;
+  }
+};
+
 // Test the hooks are correctly called and that the cookie is passed.
 TEST(ArenaTest, ArenaHooksSanity) {
   ::google::protobuf::ArenaOptions options;
-  options.on_arena_init = ArenaHooksTestUtil::on_init;
-  options.on_arena_allocation = ArenaHooksTestUtil::on_allocation;
-  options.on_arena_reset = ArenaHooksTestUtil::on_reset;
-  options.on_arena_destruction = ArenaHooksTestUtil::on_destruction;
+  ArenaOptionsTestFriend::Set(&options);
 
   // Scope for defining the arena
   {
@@ -1367,7 +1418,7 @@ TEST(ArenaTest, ArenaHooksSanity) {
     EXPECT_EQ(1, ArenaHooksTestUtil::num_init);
     EXPECT_EQ(0, ArenaHooksTestUtil::num_allocations);
     ::google::protobuf::Arena::Create<uint64>(&arena);
-    if (google::protobuf::internal::has_trivial_destructor<uint64>::value) {
+    if (std::is_trivially_destructible<uint64>::value) {
       EXPECT_EQ(1, ArenaHooksTestUtil::num_allocations);
     } else {
       EXPECT_EQ(2, ArenaHooksTestUtil::num_allocations);
@@ -1381,6 +1432,5 @@ TEST(ArenaTest, ArenaHooksSanity) {
 }
 
 
-}  // namespace
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/arenastring.cc b/src/google/protobuf/arenastring.cc
index f10732c0..7f33a0c8 100644
--- a/src/google/protobuf/arenastring.cc
+++ b/src/google/protobuf/arenastring.cc
@@ -38,16 +38,6 @@ namespace protobuf {
 namespace internal {
 
 
-void ArenaStringPtr::AssignWithDefault(const ::std::string* default_value,
-                                       ArenaStringPtr value) {
-  const ::std::string* me = *UnsafeRawStringPointer();
-  const ::std::string* other = *value.UnsafeRawStringPointer();
-  // If the pointers are the same then do nothing.
-  if (me != other) {
-    SetNoArena(default_value, value.GetNoArena());
-  }
-}
-
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/arenastring.h b/src/google/protobuf/arenastring.h
index a7efb752..168fc972 100755
--- a/src/google/protobuf/arenastring.h
+++ b/src/google/protobuf/arenastring.h
@@ -33,12 +33,11 @@
 
 #include <string>
 
-#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/arena.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/fastmem.h>
-#include <google/protobuf/arena.h>
-
-
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/port.h>
 
 // This is the implementation of arena string fields written for the open-source
 // release. The ArenaStringPtr struct below is an internal implementation class
@@ -52,6 +51,18 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
+template <typename T>
+class TaggedPtr {
+ public:
+  void Set(T* p) { ptr_ = reinterpret_cast<uintptr_t>(p); }
+  T* Get() const { return reinterpret_cast<T*>(ptr_); }
+
+  bool IsNull() { return ptr_ == 0; }
+
+ private:
+  uintptr_t ptr_;
+};
+
 struct LIBPROTOBUF_EXPORT ArenaStringPtr {
   inline void Set(const ::std::string* default_value,
                   const ::std::string& value, ::google::protobuf::Arena* arena) {
@@ -62,6 +73,12 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
     }
   }
 
+  inline void SetLite(const ::std::string* default_value,
+                      const ::std::string& value,
+                      ::google::protobuf::Arena* arena) {
+    Set(default_value, value, arena);
+  }
+
   // Basic accessors.
   inline const ::std::string& Get() const { return *ptr_; }
 
@@ -82,10 +99,18 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
     if (ptr_ == default_value) {
       return NULL;
     }
+    return ReleaseNonDefault(default_value, arena);
+  }
+
+  // Similar to Release, but ptr_ cannot be the default_value.
+  inline ::std::string* ReleaseNonDefault(
+      const ::std::string* default_value, ::google::protobuf::Arena* arena) {
+    GOOGLE_DCHECK(!IsDefault(default_value));
     ::std::string* released = NULL;
     if (arena != NULL) {
-      // ptr_ is owned by the arena -- we need to return a copy.
-      released = new ::std::string(*ptr_);
+      // ptr_ is owned by the arena.
+      released = new ::std::string;
+      released->swap(*ptr_);
     } else {
       released = ptr_;
     }
@@ -143,9 +168,32 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
   // Swaps internal pointers. Arena-safety semantics: this is guarded by the
   // logic in Swap()/UnsafeArenaSwap() at the message level, so this method is
   // 'unsafe' if called directly.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Swap(ArenaStringPtr* other) {
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void Swap(ArenaStringPtr* other) {
     std::swap(ptr_, other->ptr_);
   }
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void Swap(
+      ArenaStringPtr* other, const ::std::string* default_value, Arena* arena) {
+#ifndef NDEBUG
+    // For debug builds, we swap the contents of the string, rather than the
+    // string instances themselves.  This invalidates previously taken const
+    // references that are (per our documentation) invalidated by calling Swap()
+    // on the message.
+    //
+    // If both strings are the default_value, swapping is uninteresting.
+    // Otherwise, we use ArenaStringPtr::Mutable() to access the string, to
+    // ensure that we do not try to mutate default_value itself.
+    if (IsDefault(default_value) && other->IsDefault(default_value)) {
+      return;
+    }
+
+    ::std::string* this_ptr = Mutable(default_value, arena);
+    ::std::string* other_ptr = other->Mutable(default_value, arena);
+
+    this_ptr->swap(*other_ptr);
+#else
+    std::swap(ptr_, other->ptr_);
+#endif
+  }
 
   // Frees storage (if not on an arena).
   inline void Destroy(const ::std::string* default_value,
@@ -168,6 +216,15 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
     }
   }
 
+  // Clears content, assuming that the current value is not the empty string
+  // default.
+  inline void ClearNonDefaultToEmpty() {
+    ptr_->clear();
+  }
+  inline void ClearNonDefaultToEmptyNoArena() {
+    ptr_->clear();
+  }
+
   // Clears content, but keeps allocated string if arena != NULL, to avoid the
   // overhead of heap operations. After this returns, the content (as seen by
   // the user) will always be equal to |default_value|.
@@ -235,12 +292,19 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
     if (ptr_ == default_value) {
       return NULL;
     } else {
-      ::std::string* released = ptr_;
-      ptr_ = const_cast< ::std::string* >(default_value);
-      return released;
+      return ReleaseNonDefaultNoArena(default_value);
     }
   }
 
+  inline ::std::string* ReleaseNonDefaultNoArena(
+      const ::std::string* default_value) {
+    GOOGLE_DCHECK(!IsDefault(default_value));
+    ::std::string* released = ptr_;
+    ptr_ = const_cast< ::std::string* >(default_value);
+    return released;
+  }
+
+
   inline void SetAllocatedNoArena(const ::std::string* default_value,
                                   ::std::string* value) {
     if (ptr_ != default_value) {
@@ -288,18 +352,27 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
     return ptr_ == default_value;
   }
 
+  // Internal accessors!!!!
+  void UnsafeSetTaggedPointer(TaggedPtr< ::std::string> value) {
+    ptr_ = value.Get();
+  }
+  // Generated code only! An optimization, in certain cases the generated
+  // code is certain we can obtain a string with no default checks and
+  // tag tests.
+  ::std::string* UnsafeMutablePointer() { return ptr_; }
+
  private:
   ::std::string* ptr_;
 
-  GOOGLE_ATTRIBUTE_NOINLINE void CreateInstance(::google::protobuf::Arena* arena,
-                                         const ::std::string* initial_value) {
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+  void CreateInstance(::google::protobuf::Arena* arena,
+                      const ::std::string* initial_value) {
     GOOGLE_DCHECK(initial_value != NULL);
-    ptr_ = new ::std::string(*initial_value);
-    if (arena != NULL) {
-      arena->Own(ptr_);
-    }
+    // uses "new ::std::string" when arena is nullptr
+    ptr_ = Arena::Create< ::std::string >(arena, *initial_value);
   }
-  GOOGLE_ATTRIBUTE_NOINLINE void CreateInstanceNoArena(const ::std::string* initial_value) {
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+  void CreateInstanceNoArena(const ::std::string* initial_value) {
     GOOGLE_DCHECK(initial_value != NULL);
     ptr_ = new ::std::string(*initial_value);
   }
@@ -310,5 +383,21 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
 
 
 
+namespace protobuf {
+namespace internal {
+
+inline void ArenaStringPtr::AssignWithDefault(const ::std::string* default_value,
+                                       ArenaStringPtr value) {
+  const ::std::string* me = *UnsafeRawStringPointer();
+  const ::std::string* other = *value.UnsafeRawStringPointer();
+  // If the pointers are the same then do nothing.
+  if (me != other) {
+    SetNoArena(default_value, value.GetNoArena());
+  }
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
 }  // namespace google
 #endif  // GOOGLE_PROTOBUF_ARENASTRING_H__
diff --git a/src/google/protobuf/arenastring_unittest.cc b/src/google/protobuf/arenastring_unittest.cc
index e5afe42d..adc44fe2 100644
--- a/src/google/protobuf/arenastring_unittest.cc
+++ b/src/google/protobuf/arenastring_unittest.cc
@@ -32,19 +32,20 @@
 
 #include <google/protobuf/arenastring.h>
 
-#include <string>
-#include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
+#include <algorithm>
 #include <cstdlib>
+#include <memory>
+#include <string>
+#include <vector>
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <gtest/gtest.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+
 
 namespace google {
-using google::protobuf::internal::ArenaString;
 using google::protobuf::internal::ArenaStringPtr;
 
 namespace protobuf {
@@ -87,7 +88,35 @@ TEST(ArenaStringPtrTest, ArenaStringPtrOnArena) {
   EXPECT_EQ(string("default"), field.Get());
   field.Set(&default_value, WrapString("Test short"), &arena);
   EXPECT_EQ(string("Test short"), field.Get());
-  field.Set(&default_value, WrapString("Test long long long long value"), &arena);
+  field.Set(&default_value, WrapString("Test long long long long value"),
+            &arena);
+  EXPECT_EQ(string("Test long long long long value"), field.Get());
+  field.Set(&default_value, string(""), &arena);
+  field.Destroy(&default_value, &arena);
+
+  ArenaStringPtr field2;
+  field2.UnsafeSetDefault(&default_value);
+  ::std::string* mut = field2.Mutable(&default_value, &arena);
+  EXPECT_EQ(mut, field2.Mutable(&default_value, &arena));
+  EXPECT_EQ(mut, &field2.Get());
+  EXPECT_NE(&default_value, mut);
+  EXPECT_EQ(string("default"), *mut);
+  *mut = "Test long long long long value";  // ensure string allocates storage
+  EXPECT_EQ(string("Test long long long long value"), field2.Get());
+  field2.Destroy(&default_value, &arena);
+}
+
+TEST(ArenaStringPtrTest, ArenaStringPtrOnArenaNoSSO) {
+  google::protobuf::Arena arena;
+  ArenaStringPtr field;
+  ::std::string default_value = "default";
+  field.UnsafeSetDefault(&default_value);
+  EXPECT_EQ(string("default"), field.Get());
+
+  // Avoid triggering the SSO optimization by setting the string to something
+  // larger than the internal buffer.
+  field.Set(&default_value, WrapString("Test long long long long value"),
+            &arena);
   EXPECT_EQ(string("Test long long long long value"), field.Get());
   field.Set(&default_value, string(""), &arena);
   field.Destroy(&default_value, &arena);
@@ -104,5 +133,6 @@ TEST(ArenaStringPtrTest, ArenaStringPtrOnArena) {
   field2.Destroy(&default_value, &arena);
 }
 
+
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/compiler/annotation_test_util.cc b/src/google/protobuf/compiler/annotation_test_util.cc
new file mode 100644
index 00000000..a0530b9a
--- /dev/null
+++ b/src/google/protobuf/compiler/annotation_test_util.cc
@@ -0,0 +1,166 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/compiler/annotation_test_util.h>
+
+#include <memory>
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/compiler/command_line_interface.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
+#include <google/protobuf/descriptor.pb.h>
+
+#include <google/protobuf/testing/file.h>
+#include <google/protobuf/testing/file.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace annotation_test_util {
+namespace {
+
+// A CodeGenerator that captures the FileDescriptor it's passed as a
+// FileDescriptorProto.
+class DescriptorCapturingGenerator : public CodeGenerator {
+ public:
+  // Does not own file; file must outlive the Generator.
+  explicit DescriptorCapturingGenerator(FileDescriptorProto* file)
+      : file_(file) {}
+
+  virtual bool Generate(const FileDescriptor* file, const string& parameter,
+                        GeneratorContext* context, string* error) const {
+    file->CopyTo(file_);
+    return true;
+  }
+
+ private:
+  FileDescriptorProto* file_;
+};
+}  // namespace
+
+void AddFile(const string& filename, const string& data) {
+  GOOGLE_CHECK_OK(File::SetContents(TestTempDir() + "/" + filename, data,
+                             true));
+}
+
+bool RunProtoCompiler(const string& filename,
+                      const string& plugin_specific_args,
+                      CommandLineInterface* cli, FileDescriptorProto* file) {
+  cli->SetInputsAreProtoPathRelative(true);
+
+  DescriptorCapturingGenerator capturing_generator(file);
+  cli->RegisterGenerator("--capture_out", &capturing_generator, "");
+
+  string proto_path = "-I" + TestTempDir();
+  string capture_out = "--capture_out=" + TestTempDir();
+
+  const char* argv[] = {"protoc", proto_path.c_str(),
+                        plugin_specific_args.c_str(), capture_out.c_str(),
+                        filename.c_str()};
+
+  return cli->Run(5, argv) == 0;
+}
+
+bool DecodeMetadata(const string& path, GeneratedCodeInfo* info) {
+  string data;
+  GOOGLE_CHECK_OK(File::GetContents(path, &data, true));
+  io::ArrayInputStream input(data.data(), data.size());
+  return info->ParseFromZeroCopyStream(&input);
+}
+
+void FindAnnotationsOnPath(
+    const GeneratedCodeInfo& info, const string& source_file,
+    const std::vector<int>& path,
+    std::vector<const GeneratedCodeInfo::Annotation*>* annotations) {
+  for (int i = 0; i < info.annotation_size(); ++i) {
+    const GeneratedCodeInfo::Annotation* annotation = &info.annotation(i);
+    if (annotation->source_file() != source_file ||
+        annotation->path_size() != path.size()) {
+      continue;
+    }
+    int node = 0;
+    for (; node < path.size(); ++node) {
+      if (annotation->path(node) != path[node]) {
+        break;
+      }
+    }
+    if (node == path.size()) {
+      annotations->push_back(annotation);
+    }
+  }
+}
+
+const GeneratedCodeInfo::Annotation* FindAnnotationOnPath(
+    const GeneratedCodeInfo& info, const string& source_file,
+    const std::vector<int>& path) {
+  std::vector<const GeneratedCodeInfo::Annotation*> annotations;
+  FindAnnotationsOnPath(info, source_file, path, &annotations);
+  if (annotations.empty()) {
+    return NULL;
+  }
+  return annotations[0];
+}
+
+bool AtLeastOneAnnotationMatchesSubstring(
+    const string& file_content,
+    const std::vector<const GeneratedCodeInfo::Annotation*>& annotations,
+    const string& expected_text) {
+  for (std::vector<const GeneratedCodeInfo::Annotation*>::const_iterator
+           i = annotations.begin(),
+           e = annotations.end();
+       i != e; ++i) {
+    const GeneratedCodeInfo::Annotation* annotation = *i;
+    uint32 begin = annotation->begin();
+    uint32 end = annotation->end();
+    if (end < begin || end > file_content.size()) {
+      return false;
+    }
+    if (file_content.substr(begin, end - begin) == expected_text) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool AnnotationMatchesSubstring(const string& file_content,
+                                const GeneratedCodeInfo::Annotation* annotation,
+                                const string& expected_text) {
+  std::vector<const GeneratedCodeInfo::Annotation*> annotations;
+  annotations.push_back(annotation);
+  return AtLeastOneAnnotationMatchesSubstring(file_content, annotations,
+                                              expected_text);
+}
+}  // namespace annotation_test_util
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/compiler/annotation_test_util.h b/src/google/protobuf/compiler/annotation_test_util.h
new file mode 100644
index 00000000..90bd88b3
--- /dev/null
+++ b/src/google/protobuf/compiler/annotation_test_util.h
@@ -0,0 +1,114 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_ANNOTATION_TEST_UTIL_H__
+#define GOOGLE_PROTOBUF_COMPILER_ANNOTATION_TEST_UTIL_H__
+
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+
+// Utilities that assist in writing tests for generator annotations.
+// See java/internal/annotation_unittest.cc for an example.
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace annotation_test_util {
+
+// Struct that contains the file generated from a .proto file and its
+// GeneratedCodeInfo. For example, the Java generator will fill this struct
+// (for some 'foo.proto') with:
+//   file_path = "Foo.java"
+//   file_content = content of Foo.java
+//   file_info = parsed content of Foo.java.pb.meta
+struct ExpectedOutput {
+  string file_path;
+  string file_content;
+  GeneratedCodeInfo file_info;
+  explicit ExpectedOutput(const string& file_path) : file_path(file_path) {}
+};
+
+// Creates a file with name `filename` and content `data` in temp test
+// directory.
+void AddFile(const string& filename, const string& data);
+
+// Runs proto compiler. Captures proto file structrue in FileDescriptorProto.
+// Files will be generated in TestTempDir() folder. Callers of this
+// function must read generated files themselves.
+//
+// filename: source .proto file used to generate code.
+// plugin_specific_args: command line arguments specific to current generator.
+//     For Java, this value might be "--java_out=annotate_code:test_temp_dir"
+// cli: instance of command line interface to run generator. See Java's
+//     annotation_unittest.cc for an example of how to initialize it.
+// file: output parameter, will be set to the descriptor of the proto file
+//     specified in filename.
+bool RunProtoCompiler(const string& filename,
+                      const string& plugin_specific_args,
+                      CommandLineInterface* cli, FileDescriptorProto* file);
+
+bool DecodeMetadata(const string& path, GeneratedCodeInfo* info);
+
+// Finds all of the Annotations for a given source file and path.
+// See Location.path in http://google/protobuf/descriptor.proto for
+// explanation of what path vector is.
+void FindAnnotationsOnPath(
+    const GeneratedCodeInfo& info, const string& source_file,
+    const std::vector<int>& path,
+    std::vector<const GeneratedCodeInfo::Annotation*>* annotations);
+
+// Finds the Annotation for a given source file and path (or returns null if it
+// couldn't). If there are several annotations for given path, returns the first
+// one. See Location.path in
+// http://google/protobuf/descriptor.proto for explanation of what path
+// vector is.
+const GeneratedCodeInfo::Annotation* FindAnnotationOnPath(
+    const GeneratedCodeInfo& info, const string& source_file,
+    const std::vector<int>& path);
+
+// Returns true if at least one of the provided annotations covers a given
+// substring in file_content.
+bool AtLeastOneAnnotationMatchesSubstring(
+    const string& file_content,
+    const std::vector<const GeneratedCodeInfo::Annotation*>& annotations,
+    const string& expected_text);
+
+// Returns true if the provided annotation covers a given substring in
+// file_content.
+bool AnnotationMatchesSubstring(const string& file_content,
+                                const GeneratedCodeInfo::Annotation* annotation,
+                                const string& expected_text);
+
+}  // namespace annotation_test_util
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_ANNOTATION_TEST_UTIL_H__
diff --git a/src/google/protobuf/compiler/code_generator.cc b/src/google/protobuf/compiler/code_generator.cc
index 11d0f334..aaabd914 100644
--- a/src/google/protobuf/compiler/code_generator.cc
+++ b/src/google/protobuf/compiler/code_generator.cc
@@ -34,9 +34,9 @@
 
 #include <google/protobuf/compiler/code_generator.h>
 
-#include <google/protobuf/compiler/plugin.pb.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/plugin.pb.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/stubs/strutil.h>
 
diff --git a/src/google/protobuf/compiler/code_generator.h b/src/google/protobuf/compiler/code_generator.h
index e2b2a661..4c2b3ee1 100644
--- a/src/google/protobuf/compiler/code_generator.h
+++ b/src/google/protobuf/compiler/code_generator.h
@@ -50,6 +50,8 @@ namespace io { class ZeroCopyOutputStream; }
 class FileDescriptor;
 
 namespace compiler {
+class AccessInfoMap;
+
 class Version;
 
 // Defined in this file.
@@ -112,7 +114,8 @@ class LIBPROTOC_EXPORT CodeGenerator {
 // runs.
 class LIBPROTOC_EXPORT GeneratorContext {
  public:
-  inline GeneratorContext() {}
+  inline GeneratorContext() {
+  }
   virtual ~GeneratorContext();
 
   // Opens the given file, truncating it if it exists, and returns a
@@ -148,6 +151,7 @@ class LIBPROTOC_EXPORT GeneratorContext {
   // this GeneratorContext.
   virtual void GetCompilerVersion(Version* version) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GeneratorContext);
 };
@@ -162,8 +166,8 @@ typedef GeneratorContext OutputDirectory;
 //   "foo=bar,baz,qux=corge"
 // parses to the pairs:
 //   ("foo", "bar"), ("baz", ""), ("qux", "corge")
-extern void LIBPROTOC_EXPORT ParseGeneratorParameter(const string&,
-            std::vector<std::pair<string, string> >*);
+LIBPROTOC_EXPORT void ParseGeneratorParameter(
+    const string&, std::vector<std::pair<string, string> >*);
 
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/command_line_interface.cc b/src/google/protobuf/compiler/command_line_interface.cc
index 1914fc48..8380367f 100644
--- a/src/google/protobuf/compiler/command_line_interface.cc
+++ b/src/google/protobuf/compiler/command_line_interface.cc
@@ -33,16 +33,21 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #include <google/protobuf/compiler/command_line_interface.h>
+
+
 #include <google/protobuf/stubs/platform_macros.h>
 
 #include <stdio.h>
 #include <sys/types.h>
+#ifdef major
+#undef major
+#endif
+#ifdef minor
+#undef minor
+#endif
 #include <sys/stat.h>
 #include <fcntl.h>
-#ifdef _MSC_VER
-#include <io.h>
-#include <direct.h>
-#else
+#ifndef _MSC_VER
 #include <unistd.h>
 #endif
 #include <errno.h>
@@ -53,54 +58,36 @@
 #include <limits.h> //For PATH_MAX
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #ifdef __APPLE__
 #include <mach-o/dyld.h>
 #endif
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/stringprintf.h>
-#include <google/protobuf/compiler/importer.h>
-#include <google/protobuf/compiler/code_generator.h>
-#include <google/protobuf/compiler/plugin.pb.h>
 #include <google/protobuf/compiler/subprocess.h>
 #include <google/protobuf/compiler/zip_writer.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/text_format.h>
-#include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/compiler/plugin.pb.h>
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/compiler/importer.h>
 #include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/text_format.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/stl_util.h>
+#include <google/protobuf/stubs/io_win32.h>
 
 
 namespace google {
 namespace protobuf {
 namespace compiler {
 
-#if defined(_WIN32)
-#define mkdir(name, mode) mkdir(name)
-#ifndef W_OK
-#define W_OK 02  // not defined by MSVC for whatever reason
-#endif
-#ifndef F_OK
-#define F_OK 00  // not defined by MSVC for whatever reason
-#endif
-#ifndef STDIN_FILENO
-#define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO 1
-#endif
-#endif
-
 #ifndef O_BINARY
 #ifdef _O_BINARY
 #define O_BINARY _O_BINARY
@@ -110,10 +97,15 @@ namespace compiler {
 #endif
 
 namespace {
-#if defined(_WIN32) && !defined(__CYGWIN__)
-static const char* kPathSeparator = ";";
-#else
-static const char* kPathSeparator = ":";
+#if defined(_WIN32)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::close;
+using google::protobuf::internal::win32::mkdir;
+using google::protobuf::internal::win32::open;
+using google::protobuf::internal::win32::setmode;
+using google::protobuf::internal::win32::write;
 #endif
 
 static const char* kDefaultDirectDependenciesViolationMsg =
@@ -135,9 +127,9 @@ static bool IsWindowsAbsolutePath(const string& text) {
 
 void SetFdToTextMode(int fd) {
 #ifdef _WIN32
-  if (_setmode(fd, _O_TEXT) == -1) {
+  if (setmode(fd, _O_TEXT) == -1) {
     // This should never happen, I think.
-    GOOGLE_LOG(WARNING) << "_setmode(" << fd << ", _O_TEXT): " << strerror(errno);
+    GOOGLE_LOG(WARNING) << "setmode(" << fd << ", _O_TEXT): " << strerror(errno);
   }
 #endif
   // (Text and binary are the same on non-Windows platforms.)
@@ -145,9 +137,9 @@ void SetFdToTextMode(int fd) {
 
 void SetFdToBinaryMode(int fd) {
 #ifdef _WIN32
-  if (_setmode(fd, _O_BINARY) == -1) {
+  if (setmode(fd, _O_BINARY) == -1) {
     // This should never happen, I think.
-    GOOGLE_LOG(WARNING) << "_setmode(" << fd << ", _O_BINARY): " << strerror(errno);
+    GOOGLE_LOG(WARNING) << "setmode(" << fd << ", _O_BINARY): " << strerror(errno);
   }
 #endif
   // (Text and binary are the same on non-Windows platforms.)
@@ -176,8 +168,7 @@ bool VerifyDirectoryExists(const string& path) {
 // directories listed in |filename|.
 bool TryCreateParentDirectory(const string& prefix, const string& filename) {
   // Recursively create parent directories to the output file.
-  std::vector<string> parts =
-      Split(filename, "/", true);
+  std::vector<string> parts = Split(filename, "/", true);
   string path_so_far = prefix;
   for (int i = 0; i < parts.size() - 1; i++) {
     path_so_far += parts[i];
@@ -229,9 +220,9 @@ bool IsInstalledProtoPath(const string& path) {
   return access(file_path.c_str(), F_OK) != -1;
 }
 
-// Add the paths where google/protobuf/descritor.proto and other well-known
+// Add the paths where google/protobuf/descriptor.proto and other well-known
 // type protos are installed.
-void AddDefaultProtoPaths(vector<pair<string, string> >* paths) {
+void AddDefaultProtoPaths(std::vector<std::pair<string, string> >* paths) {
   // TODO(xiaofeng): The code currently only checks relative paths of where
   // the protoc binary is installed. We probably should make it handle more
   // cases than that.
@@ -247,12 +238,12 @@ void AddDefaultProtoPaths(vector<pair<string, string> >* paths) {
   path = path.substr(0, pos);
   // Check the binary's directory.
   if (IsInstalledProtoPath(path)) {
-    paths->push_back(pair<string, string>("", path));
+    paths->push_back(std::pair<string, string>("", path));
     return;
   }
   // Check if there is an include subdirectory.
   if (IsInstalledProtoPath(path + "/include")) {
-    paths->push_back(pair<string, string>("", path + "/include"));
+    paths->push_back(std::pair<string, string>("", path + "/include"));
     return;
   }
   // Check if the upper level directory has an "include" subdirectory.
@@ -262,7 +253,7 @@ void AddDefaultProtoPaths(vector<pair<string, string> >* paths) {
   }
   path = path.substr(0, pos);
   if (IsInstalledProtoPath(path + "/include")) {
-    paths->push_back(pair<string, string>("", path + "/include"));
+    paths->push_back(std::pair<string, string>("", path + "/include"));
     return;
   }
 }
@@ -272,11 +263,14 @@ string PluginName(const string& plugin_prefix, const string& directive) {
   // strip the "--" and "_out/_opt" and add the plugin prefix.
   return plugin_prefix + "gen-" + directive.substr(2, directive.size() - 6);
 }
+
 }  // namespace
 
 // A MultiFileErrorCollector that prints errors to stderr.
-class CommandLineInterface::ErrorPrinter : public MultiFileErrorCollector,
-                                           public io::ErrorCollector {
+class CommandLineInterface::ErrorPrinter
+    : public MultiFileErrorCollector,
+      public io::ErrorCollector,
+      public DescriptorPool::ErrorCollector {
  public:
   ErrorPrinter(ErrorFormat format, DiskSourceTree *tree = NULL)
     : format_(format), tree_(tree), found_errors_(false) {}
@@ -303,6 +297,25 @@ class CommandLineInterface::ErrorPrinter : public MultiFileErrorCollector,
     AddErrorOrWarning("input", line, column, message, "warning", std::clog);
   }
 
+  // implements DescriptorPool::ErrorCollector-------------------------
+  void AddError(
+      const string& filename,
+      const string& element_name,
+      const Message* descriptor,
+      ErrorLocation location,
+      const string& message) {
+    AddErrorOrWarning(filename, -1, -1, message, "error", std::cerr);
+  }
+
+  void AddWarning(
+      const string& filename,
+      const string& element_name,
+      const Message* descriptor,
+      ErrorLocation location,
+      const string& message) {
+    AddErrorOrWarning(filename, -1, -1, message, "warning", std::clog);
+  }
+
   bool FoundErrors() const { return found_errors_; }
 
  private:
@@ -404,6 +417,13 @@ class CommandLineInterface::MemoryOutputStream
   virtual int64 ByteCount() const           { return inner_->ByteCount();      }
 
  private:
+  // Checks to see if "filename_.meta" exists in directory_; if so, fixes the
+  // offsets in that GeneratedCodeInfo record to reflect bytes inserted in
+  // filename_ at original offset insertion_offset with length insertion_length.
+  // We assume that insertions will not occur within any given annotated span
+  // of text.
+  void UpdateMetadata(size_t insertion_offset, size_t insertion_length);
+
   // Where to insert the string when it's done.
   GeneratorContextImpl* directory_;
   string filename_;
@@ -416,7 +436,7 @@ class CommandLineInterface::MemoryOutputStream
   bool append_mode_;
 
   // StringOutputStream writing to data_.
-  google::protobuf::scoped_ptr<io::StringOutputStream> inner_;
+  std::unique_ptr<io::StringOutputStream> inner_;
 };
 
 // -------------------------------------------------------------------
@@ -424,8 +444,7 @@ class CommandLineInterface::MemoryOutputStream
 CommandLineInterface::GeneratorContextImpl::GeneratorContextImpl(
     const std::vector<const FileDescriptor*>& parsed_files)
     : parsed_files_(parsed_files),
-      had_error_(false) {
-}
+      had_error_(false) {}
 
 CommandLineInterface::GeneratorContextImpl::~GeneratorContextImpl() {
   STLDeleteValues(&files_);
@@ -601,6 +620,44 @@ CommandLineInterface::MemoryOutputStream::MemoryOutputStream(
       inner_(new io::StringOutputStream(&data_)) {
 }
 
+void CommandLineInterface::MemoryOutputStream::UpdateMetadata(
+    size_t insertion_offset, size_t insertion_length) {
+  std::map<string, string*>::iterator meta_file =
+      directory_->files_.find(filename_ + ".meta");
+  if (meta_file == directory_->files_.end() || !meta_file->second) {
+    // No metadata was recorded for this file.
+    return;
+  }
+  string* encoded_data = meta_file->second;
+  GeneratedCodeInfo metadata;
+  bool is_text_format = false;
+  if (!metadata.ParseFromString(*encoded_data)) {
+    if (!TextFormat::ParseFromString(*encoded_data, &metadata)) {
+      // The metadata is invalid.
+      std::cerr << filename_
+                << ".meta: Could not parse metadata as wire or text format."
+                << std::endl;
+      return;
+    }
+    // Generators that use the public plugin interface emit text-format
+    // metadata (because in the public plugin protocol, file content must be
+    // UTF8-encoded strings).
+    is_text_format = true;
+  }
+  for (int i = 0; i < metadata.annotation_size(); ++i) {
+    GeneratedCodeInfo::Annotation* annotation = metadata.mutable_annotation(i);
+    if (annotation->begin() >= insertion_offset) {
+      annotation->set_begin(annotation->begin() + insertion_length);
+      annotation->set_end(annotation->end() + insertion_length);
+    }
+  }
+  if (is_text_format) {
+    TextFormat::PrintToString(metadata, encoded_data);
+  } else {
+    metadata.SerializeToString(encoded_data);
+  }
+}
+
 CommandLineInterface::MemoryOutputStream::~MemoryOutputStream() {
   // Make sure all data has been written.
   inner_.reset();
@@ -678,6 +735,7 @@ CommandLineInterface::MemoryOutputStream::~MemoryOutputStream() {
     if (indent_.empty()) {
       // No indent.  This makes things easier.
       target->insert(pos, data_);
+      UpdateMetadata(pos, data_.size());
     } else {
       // Calculate how much space we need.
       int indent_size = 0;
@@ -687,6 +745,7 @@ CommandLineInterface::MemoryOutputStream::~MemoryOutputStream() {
 
       // Make a hole for it.
       target->insert(pos, data_.size() + indent_size, '\0');
+      UpdateMetadata(pos, data_.size() + indent_size);
 
       // Now copy in the data.
       string::size_type data_pos = 0;
@@ -714,6 +773,12 @@ CommandLineInterface::MemoryOutputStream::~MemoryOutputStream() {
 
 // ===================================================================
 
+#if defined(_WIN32) && !defined(__CYGWIN__)
+const char* const CommandLineInterface::kPathSeparator = ";";
+#else
+const char* const CommandLineInterface::kPathSeparator = ":";
+#endif
+
 CommandLineInterface::CommandLineInterface()
     : mode_(MODE_COMPILE),
       print_mode_(PRINT_NONE),
@@ -723,9 +788,7 @@ CommandLineInterface::CommandLineInterface()
           kDefaultDirectDependenciesViolationMsg),
       imports_in_descriptor_set_(false),
       source_info_in_descriptor_set_(false),
-      disallow_services_(false),
-      inputs_are_proto_path_relative_(false) {
-}
+      disallow_services_(false) {}
 CommandLineInterface::~CommandLineInterface() {}
 
 void CommandLineInterface::RegisterGenerator(const string& flag_name,
@@ -766,63 +829,42 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
       break;
   }
 
-  AddDefaultProtoPaths(&proto_path_);
-
-  // Set up the source tree.
-  DiskSourceTree source_tree;
-  for (int i = 0; i < proto_path_.size(); i++) {
-    source_tree.MapPath(proto_path_[i].first, proto_path_[i].second);
-  }
-
-  // Map input files to virtual paths if necessary.
-  if (!inputs_are_proto_path_relative_) {
-    if (!MakeInputsBeProtoPathRelative(&source_tree)) {
+  std::vector<const FileDescriptor*> parsed_files;
+  // null unless descriptor_set_in_names_.empty()
+  std::unique_ptr<DiskSourceTree> disk_source_tree;
+  std::unique_ptr<ErrorPrinter> error_collector;
+  std::unique_ptr<DescriptorPool> descriptor_pool;
+  std::unique_ptr<DescriptorDatabase> descriptor_database;
+  if (descriptor_set_in_names_.empty()) {
+    disk_source_tree.reset(new DiskSourceTree());
+    if (!InitializeDiskSourceTree(disk_source_tree.get())) {
       return 1;
     }
-  }
-
-  // Allocate the Importer.
-  ErrorPrinter error_collector(error_format_, &source_tree);
-  Importer importer(&source_tree, &error_collector);
-
-  std::vector<const FileDescriptor*> parsed_files;
+    error_collector.reset(
+        new ErrorPrinter(error_format_, disk_source_tree.get()));
 
-  // Parse each file.
-  for (int i = 0; i < input_files_.size(); i++) {
-    // Import the file.
-    importer.AddUnusedImportTrackFile(input_files_[i]);
-    const FileDescriptor* parsed_file = importer.Import(input_files_[i]);
-    importer.ClearUnusedImportTrackFiles();
-    if (parsed_file == NULL) return 1;
-    parsed_files.push_back(parsed_file);
+    SourceTreeDescriptorDatabase* database =
+        new SourceTreeDescriptorDatabase(disk_source_tree.get());
+    database->RecordErrorsTo(error_collector.get());
+    descriptor_database.reset(database);
+    descriptor_pool.reset(new DescriptorPool(
+        descriptor_database.get(), database->GetValidationErrorCollector()));
+  } else {
+    error_collector.reset(new ErrorPrinter(error_format_));
 
-    // Enforce --disallow_services.
-    if (disallow_services_ && parsed_file->service_count() > 0) {
-      cerr << parsed_file->name() << ": This file contains services, but "
-              "--disallow_services was used." << endl;
+    SimpleDescriptorDatabase* database = new SimpleDescriptorDatabase();
+    descriptor_database.reset(database);
+    if (!PopulateSimpleDescriptorDatabase(database)) {
       return 1;
     }
-
-    // Enforce --direct_dependencies
-    if (direct_dependencies_explicitly_set_) {
-      bool indirect_imports = false;
-      for (int i = 0; i < parsed_file->dependency_count(); i++) {
-        if (direct_dependencies_.find(parsed_file->dependency(i)->name()) ==
-            direct_dependencies_.end()) {
-          indirect_imports = true;
-          cerr << parsed_file->name() << ": "
-               << StringReplace(direct_dependencies_violation_msg_, "%s",
-                                parsed_file->dependency(i)->name(),
-                                true /* replace_all */)
-               << std::endl;
-        }
-      }
-      if (indirect_imports) {
-        return 1;
-      }
-    }
+    descriptor_pool.reset(new DescriptorPool(database, error_collector.get()));
+  }
+  descriptor_pool->EnforceWeakDependencies(true);
+  if (!ParseInputFiles(descriptor_pool.get(), &parsed_files)) {
+    return 1;
   }
 
+
   // We construct a separate GeneratorContext for each output location.  Note
   // that two code generators may output to the same location, in which case
   // they should share a single GeneratorContext so that OpenForInsert() works.
@@ -873,15 +915,16 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
   }
 
   if (!dependency_out_name_.empty()) {
+    GOOGLE_DCHECK(disk_source_tree.get());
     if (!GenerateDependencyManifestFile(parsed_files, output_directories,
-                                        &source_tree)) {
+                                        disk_source_tree.get())) {
       return 1;
     }
   }
 
   STLDeleteValues(&output_directories);
 
-  if (!descriptor_set_name_.empty()) {
+  if (!descriptor_set_out_name_.empty()) {
     if (!WriteDescriptorSet(parsed_files)) {
       return 1;
     }
@@ -900,13 +943,13 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
         return 1;
       }
     } else {
-      if (!EncodeOrDecode(importer.pool())) {
+      if (!EncodeOrDecode(descriptor_pool.get())) {
         return 1;
       }
     }
   }
 
-  if (error_collector.FoundErrors()) {
+  if (error_collector->FoundErrors()) {
     return 1;
   }
 
@@ -922,7 +965,7 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
         break;
       case PRINT_NONE:
         GOOGLE_LOG(ERROR) << "If the code reaches here, it usually means a bug of "
-                     "flag parsing in the CommonadLineInterface.";
+                     "flag parsing in the CommandLineInterface.";
         return 1;
 
       // Do not add a default case.
@@ -932,6 +975,113 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
   return 0;
 }
 
+bool CommandLineInterface::InitializeDiskSourceTree(
+    DiskSourceTree* source_tree) {
+  AddDefaultProtoPaths(&proto_path_);
+
+  // Set up the source tree.
+  for (int i = 0; i < proto_path_.size(); i++) {
+    source_tree->MapPath(proto_path_[i].first, proto_path_[i].second);
+  }
+
+  // Map input files to virtual paths if possible.
+  if (!MakeInputsBeProtoPathRelative(source_tree)) {
+    return false;
+  }
+  return true;
+}
+
+bool CommandLineInterface::PopulateSimpleDescriptorDatabase(
+    SimpleDescriptorDatabase* database) {
+  for (int i = 0; i < descriptor_set_in_names_.size(); i++) {
+    int fd;
+    do {
+      fd = open(descriptor_set_in_names_[i].c_str(), O_RDONLY | O_BINARY);
+    } while (fd < 0 && errno == EINTR);
+    if (fd < 0) {
+      std::cerr << descriptor_set_in_names_[i] << ": "
+                << strerror(ENOENT) << std::endl;
+      return false;
+    }
+
+    FileDescriptorSet file_descriptor_set;
+    bool parsed = file_descriptor_set.ParseFromFileDescriptor(fd);
+    if (close(fd) != 0) {
+      std::cerr << descriptor_set_in_names_[i] << ": close: "
+                << strerror(errno)
+                << std::endl;
+      return false;
+    }
+
+    if (!parsed) {
+      std::cerr << descriptor_set_in_names_[i] << ": Unable to parse."
+                << std::endl;
+      return false;
+    }
+
+    for (int j = 0; j < file_descriptor_set.file_size(); j++) {
+      FileDescriptorProto previously_added_file_descriptor_proto;
+      if (database->FindFileByName(file_descriptor_set.file(j).name(),
+                                   &previously_added_file_descriptor_proto)) {
+        // already present - skip
+        continue;
+      }
+      if (!database->Add(file_descriptor_set.file(j))) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+bool CommandLineInterface::ParseInputFiles(
+    DescriptorPool* descriptor_pool,
+    std::vector<const FileDescriptor*>* parsed_files) {
+
+  // Parse each file.
+  for (int i = 0; i < input_files_.size(); i++) {
+    // Import the file.
+    descriptor_pool->AddUnusedImportTrackFile(input_files_[i]);
+    const FileDescriptor* parsed_file =
+        descriptor_pool->FindFileByName(input_files_[i]);
+    descriptor_pool->ClearUnusedImportTrackFiles();
+    if (parsed_file == NULL) {
+      if (!descriptor_set_in_names_.empty()) {
+        std::cerr << input_files_[i] << ": " << strerror(ENOENT) << std::endl;
+      }
+      return false;
+    }
+    parsed_files->push_back(parsed_file);
+
+    // Enforce --disallow_services.
+    if (disallow_services_ && parsed_file->service_count() > 0) {
+      std::cerr << parsed_file->name() << ": This file contains services, but "
+              "--disallow_services was used." << std::endl;
+      return false;
+    }
+
+    // Enforce --direct_dependencies
+    if (direct_dependencies_explicitly_set_) {
+      bool indirect_imports = false;
+      for (int i = 0; i < parsed_file->dependency_count(); i++) {
+        if (direct_dependencies_.find(parsed_file->dependency(i)->name()) ==
+            direct_dependencies_.end()) {
+          indirect_imports = true;
+          std::cerr << parsed_file->name() << ": "
+                    << StringReplace(direct_dependencies_violation_msg_, "%s",
+                                     parsed_file->dependency(i)->name(),
+                                     true /* replace_all */)
+                    << std::endl;
+        }
+      }
+      if (indirect_imports) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
 void CommandLineInterface::Clear() {
   // Clear all members that are set by Run().  Note that we must not clear
   // members which are set by other methods before Run() is called.
@@ -942,7 +1092,8 @@ void CommandLineInterface::Clear() {
   direct_dependencies_violation_msg_ = kDefaultDirectDependenciesViolationMsg;
   output_directives_.clear();
   codec_type_.clear();
-  descriptor_set_name_.clear();
+  descriptor_set_in_names_.clear();
+  descriptor_set_out_name_.clear();
   dependency_out_name_.clear();
 
   mode_ = MODE_COMPILE;
@@ -956,6 +1107,17 @@ void CommandLineInterface::Clear() {
 bool CommandLineInterface::MakeInputsBeProtoPathRelative(
     DiskSourceTree* source_tree) {
   for (int i = 0; i < input_files_.size(); i++) {
+    // If the input file path is not a physical file path, it must be a virtual
+    // path.
+    if (access(input_files_[i].c_str(), F_OK) < 0) {
+      string disk_file;
+      if (source_tree->VirtualFileToDiskFile(input_files_[i], &disk_file)) {
+        return true;
+      } else {
+        std::cerr << input_files_[i] << ": " << strerror(ENOENT) << std::endl;
+        return false;
+      }
+    }
     string virtual_file, shadowing_disk_file;
     switch (source_tree->DiskFileToVirtualFile(
         input_files_[i], &virtual_file, &shadowing_disk_file)) {
@@ -973,12 +1135,14 @@ bool CommandLineInterface::MakeInputsBeProtoPathRelative(
       case DiskSourceTree::CANNOT_OPEN:
         std::cerr << input_files_[i] << ": " << strerror(errno) << std::endl;
         return false;
-      case DiskSourceTree::NO_MAPPING:
-        // First check if the file exists at all.
-        if (access(input_files_[i].c_str(), F_OK) < 0) {
-          // File does not even exist.
-          std::cerr << input_files_[i] << ": " << strerror(ENOENT) << std::endl;
+      case DiskSourceTree::NO_MAPPING: {
+        // Try to interpret the path as a virtual path.
+        string disk_file;
+        if (source_tree->VirtualFileToDiskFile(input_files_[i], &disk_file)) {
+          return true;
         } else {
+          // The input file path can't be mapped to any --proto_path and it also
+          // can't be interpreted as a virtual path.
           std::cerr
               << input_files_[i]
               << ": File does not reside within any path "
@@ -987,15 +1151,32 @@ bool CommandLineInterface::MakeInputsBeProtoPathRelative(
                  "proto_path must be an exact prefix of the .proto file "
                  "names -- protoc is too dumb to figure out when two paths "
                  "(e.g. absolute and relative) are equivalent (it's harder "
-                 "than you think)." << std::endl;
+                 "than you think)."
+              << std::endl;
+          return false;
         }
-        return false;
+      }
     }
   }
 
   return true;
 }
 
+bool CommandLineInterface::ExpandArgumentFile(const string& file,
+                                              std::vector<string>* arguments) {
+  // The argument file is searched in the working directory only. We don't
+  // use the proto import path here.
+  std::ifstream file_stream(file.c_str());
+  if (!file_stream.is_open()) {
+    return false;
+  }
+  string argument;
+  // We don't support any kind of shell expansion right now.
+  while (std::getline(file_stream, argument)) {
+    arguments->push_back(argument);
+  }
+  return true;
+}
 
 CommandLineInterface::ParseArgumentStatus
 CommandLineInterface::ParseArguments(int argc, const char* const argv[]) {
@@ -1003,9 +1184,23 @@ CommandLineInterface::ParseArguments(int argc, const char* const argv[]) {
 
   std::vector<string> arguments;
   for (int i = 1; i < argc; ++i) {
+    if (argv[i][0] == '@') {
+      if (!ExpandArgumentFile(argv[i] + 1, &arguments)) {
+        std::cerr << "Failed to open argument file: " << (argv[i] + 1)
+                  << std::endl;
+        return PARSE_ARGUMENT_FAIL;
+      }
+      continue;
+    }
     arguments.push_back(argv[i]);
   }
 
+  // if no arguments are given, show help
+  if (arguments.empty()) {
+    PrintHelpText();
+    return PARSE_ARGUMENT_DONE_AND_EXIT;  // Exit without running compiler.
+  }
+
   // Iterate through all arguments and parse them.
   for (int i = 0; i < arguments.size(); ++i) {
     string name, value;
@@ -1032,7 +1227,7 @@ CommandLineInterface::ParseArguments(int argc, const char* const argv[]) {
 
   // Make sure each plugin option has a matching plugin output.
   bool foundUnknownPluginOption = false;
-  for (map<string, string>::const_iterator i = plugin_parameters_.begin();
+  for (std::map<string, string>::const_iterator i = plugin_parameters_.begin();
        i != plugin_parameters_.end(); ++i) {
     if (plugins_.find(i->first) != plugins_.end()) {
       continue;
@@ -1079,7 +1274,7 @@ CommandLineInterface::ParseArguments(int argc, const char* const argv[]) {
     return PARSE_ARGUMENT_FAIL;
   }
   if (mode_ == MODE_COMPILE && output_directives_.empty() &&
-      descriptor_set_name_.empty()) {
+      descriptor_set_out_name_.empty()) {
     std::cerr << "Missing output directives." << std::endl;
     return PARSE_ARGUMENT_FAIL;
   }
@@ -1094,11 +1289,11 @@ CommandLineInterface::ParseArguments(int argc, const char* const argv[]) {
         << std::endl;
     return PARSE_ARGUMENT_FAIL;
   }
-  if (imports_in_descriptor_set_ && descriptor_set_name_.empty()) {
+  if (imports_in_descriptor_set_ && descriptor_set_out_name_.empty()) {
     std::cerr << "--include_imports only makes sense when combined with "
                  "--descriptor_set_out." << std::endl;
   }
-  if (source_info_in_descriptor_set_ && descriptor_set_name_.empty()) {
+  if (source_info_in_descriptor_set_ && descriptor_set_out_name_.empty()) {
     std::cerr << "--include_source_info only makes sense when combined with "
                  "--descriptor_set_out." << std::endl;
   }
@@ -1185,11 +1380,19 @@ CommandLineInterface::InterpretArgument(const string& name,
     input_files_.push_back(value);
 
   } else if (name == "-I" || name == "--proto_path") {
+    if (!descriptor_set_in_names_.empty()) {
+      std::cerr << "Only one of " << name
+                << " and --descriptor_set_in can be specified."
+                << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+
     // Java's -classpath (and some other languages) delimits path components
     // with colons.  Let's accept that syntax too just to make things more
     // intuitive.
     std::vector<string> parts = Split(
-        value, kPathSeparator, true);
+        value, CommandLineInterface::kPathSeparator,
+        true);
 
     for (int i = 0; i < parts.size(); i++) {
       string virtual_path;
@@ -1213,9 +1416,10 @@ CommandLineInterface::InterpretArgument(const string& name,
 
       // Make sure disk path exists, warn otherwise.
       if (access(disk_path.c_str(), F_OK) < 0) {
-        // Try the original path; it may have just happed to have a '=' in it.
+        // Try the original path; it may have just happened to have a '=' in it.
         if (access(parts[i].c_str(), F_OK) < 0) {
-          cerr << disk_path << ": warning: directory does not exist." << endl;
+          std::cerr << disk_path << ": warning: directory does not exist."
+                    << std::endl;
         } else {
           virtual_path = "";
           disk_path = parts[i];
@@ -1238,16 +1442,44 @@ CommandLineInterface::InterpretArgument(const string& name,
     }
 
     direct_dependencies_explicitly_set_ = true;
-    std::vector<string> direct = Split(
-        value, ":", true);
+    std::vector<string> direct = Split(value, ":", true);
     GOOGLE_DCHECK(direct_dependencies_.empty());
     direct_dependencies_.insert(direct.begin(), direct.end());
 
   } else if (name == "--direct_dependencies_violation_msg") {
     direct_dependencies_violation_msg_ = value;
 
+  } else if (name == "--descriptor_set_in") {
+    if (!descriptor_set_in_names_.empty()) {
+      std::cerr << name << " may only be passed once. To specify multiple "
+                           "descriptor sets, pass them all as a single "
+                           "parameter separated by '"
+                << CommandLineInterface::kPathSeparator << "'."
+                << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    if (value.empty()) {
+      std::cerr << name << " requires a non-empty value." << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    if (!proto_path_.empty()) {
+      std::cerr << "Only one of " << name
+                << " and --proto_path can be specified."
+                << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    if (!dependency_out_name_.empty()) {
+      std::cerr << name << " cannot be used with --dependency_out."
+                << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+
+    descriptor_set_in_names_ = Split(
+        value, CommandLineInterface::kPathSeparator,
+        true);
+
   } else if (name == "-o" || name == "--descriptor_set_out") {
-    if (!descriptor_set_name_.empty()) {
+    if (!descriptor_set_out_name_.empty()) {
       std::cerr << name << " may only be passed once." << std::endl;
       return PARSE_ARGUMENT_FAIL;
     }
@@ -1261,7 +1493,7 @@ CommandLineInterface::InterpretArgument(const string& name,
              "same time." << std::endl;
       return PARSE_ARGUMENT_FAIL;
     }
-    descriptor_set_name_ = value;
+    descriptor_set_out_name_ = value;
 
   } else if (name == "--dependency_out") {
     if (!dependency_out_name_.empty()) {
@@ -1272,6 +1504,11 @@ CommandLineInterface::InterpretArgument(const string& name,
       std::cerr << name << " requires a non-empty value." << std::endl;
       return PARSE_ARGUMENT_FAIL;
     }
+    if (!descriptor_set_in_names_.empty()) {
+      std::cerr << name << " cannot be used with --descriptor_set_in."
+                << std::endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
     dependency_out_name_ = value;
 
   } else if (name == "--include_imports") {
@@ -1296,9 +1533,9 @@ CommandLineInterface::InterpretArgument(const string& name,
     if (!version_info_.empty()) {
       std::cout << version_info_ << std::endl;
     }
-    cout << "libprotoc "
+    std::cout << "libprotoc "
          << protobuf::internal::VersionString(GOOGLE_PROTOBUF_VERSION)
-         << endl;
+         << std::endl;
     return PARSE_ARGUMENT_DONE_AND_EXIT;  // Exit without running compiler.
 
   } else if (name == "--disallow_services") {
@@ -1311,7 +1548,7 @@ CommandLineInterface::InterpretArgument(const string& name,
                 << std::endl;
       return PARSE_ARGUMENT_FAIL;
     }
-    if (!output_directives_.empty() || !descriptor_set_name_.empty()) {
+    if (!output_directives_.empty() || !descriptor_set_out_name_.empty()) {
       std::cerr << "Cannot use " << name
                 << " and generate code or descriptors at the same time."
                 << std::endl;
@@ -1377,7 +1614,7 @@ CommandLineInterface::InterpretArgument(const string& name,
                 << "other info at the same time." << std::endl;
       return PARSE_ARGUMENT_FAIL;
     }
-    if (!output_directives_.empty() || !descriptor_set_name_.empty()) {
+    if (!output_directives_.empty() || !descriptor_set_out_name_.empty()) {
       std::cerr << "Cannot use " << name
                 << " and generate code or descriptors at the same time."
                 << std::endl;
@@ -1446,7 +1683,7 @@ CommandLineInterface::InterpretArgument(const string& name,
 
 void CommandLineInterface::PrintHelpText() {
   // Sorry for indentation here; line wrapping would be uglier.
-  std::cerr <<
+  std::cout <<
 "Usage: " << executable_name_ << " [OPTION] PROTO_FILES\n"
 "Parse PROTO_FILES and generate output based on the options given:\n"
 "  -IPATH, --proto_path=PATH   Specify the directory in which to search for\n"
@@ -1468,6 +1705,14 @@ void CommandLineInterface::PrintHelpText() {
 "                              pairs in text format to standard output.  No\n"
 "                              PROTO_FILES should be given when using this\n"
 "                              flag.\n"
+"  --descriptor_set_in=FILES   Specifies a delimited list of FILES\n"
+"                              each containing a FileDescriptorSet (a\n"
+"                              protocol buffer defined in descriptor.proto).\n"
+"                              The FileDescriptor for each of the PROTO_FILES\n"
+"                              provided will be loaded from these\n"
+"                              FileDescriptorSets. If a FileDescriptor\n"
+"                              appears multiple times, the first occurrence\n"
+"                              will be used.\n"
 "  -oFILE,                     Writes a FileDescriptorSet (a protocol buffer,\n"
 "    --descriptor_set_out=FILE defined in descriptor.proto) containing all of\n"
 "                              the input files to FILE.\n"
@@ -1493,7 +1738,7 @@ void CommandLineInterface::PrintHelpText() {
 "                              occupied fields numbers.\n"
       << std::endl;
   if (!plugin_prefix_.empty()) {
-    std::cerr <<
+    std::cout <<
 "  --plugin=EXECUTABLE         Specifies a plugin executable to use.\n"
 "                              Normally, protoc searches the PATH for\n"
 "                              plugins, but you may specify additional\n"
@@ -1509,10 +1754,24 @@ void CommandLineInterface::PrintHelpText() {
     // FIXME(kenton):  If the text is long enough it will wrap, which is ugly,
     //   but fixing this nicely (e.g. splitting on spaces) is probably more
     //   trouble than it's worth.
-    std::cerr << "  " << iter->first << "=OUT_DIR "
+    std::cout << "  " << iter->first << "=OUT_DIR "
               << string(19 - iter->first.size(), ' ')  // Spaces for alignment.
               << iter->second.help_text << std::endl;
   }
+  std::cerr <<
+"  @<filename>                 Read options and filenames from file. If a\n"
+"                              relative file path is specified, the file\n"
+"                              will be searched in the working directory.\n"
+"                              The --proto_path option will not affect how\n"
+"                              this argument file is searched. Content of\n"
+"                              the file will be expanded in the position of\n"
+"                              @<filename> as in the argument list. Note\n"
+"                              that shell expansion is not applied to the\n"
+"                              content of the file (i.e., you cannot use\n"
+"                              quotes, wildcards, escapes, commands, etc.).\n"
+"                              Each line corresponds to a single argument,\n"
+"                              even if it contains spaces."
+      << std::endl;
 }
 
 bool CommandLineInterface::GenerateOutput(
@@ -1641,12 +1900,15 @@ bool CommandLineInterface::GeneratePluginOutput(
     string* error) {
   CodeGeneratorRequest request;
   CodeGeneratorResponse response;
+  string processed_parameter = parameter;
+
 
   // Build the request.
-  if (!parameter.empty()) {
-    request.set_parameter(parameter);
+  if (!processed_parameter.empty()) {
+    request.set_parameter(processed_parameter);
   }
 
+
   std::set<const FileDescriptor*> already_seen;
   for (int i = 0; i < parsed_files.size(); i++) {
     request.add_file_to_generate(parsed_files[i]->name());
@@ -1680,17 +1942,18 @@ bool CommandLineInterface::GeneratePluginOutput(
 
   // Write the files.  We do this even if there was a generator error in order
   // to match the behavior of a compiled-in generator.
-  google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> current_output;
+  std::unique_ptr<io::ZeroCopyOutputStream> current_output;
   for (int i = 0; i < response.file_size(); i++) {
     const CodeGeneratorResponse::File& output_file = response.file(i);
 
     if (!output_file.insertion_point().empty()) {
+      string filename = output_file.name();
       // Open a file for insert.
       // We reset current_output to NULL first so that the old file is closed
       // before the new one is opened.
       current_output.reset();
       current_output.reset(generator_context->OpenForInsert(
-          output_file.name(), output_file.insertion_point()));
+          filename, output_file.insertion_point()));
     } else if (!output_file.name().empty()) {
       // Starting a new file.  Open it.
       // We reset current_output to NULL first so that the old file is closed
@@ -1729,7 +1992,7 @@ bool CommandLineInterface::EncodeOrDecode(const DescriptorPool* pool) {
   }
 
   DynamicMessageFactory dynamic_factory(pool);
-  google::protobuf::scoped_ptr<Message> message(dynamic_factory.GetPrototype(type)->New());
+  std::unique_ptr<Message> message(dynamic_factory.GetPrototype(type)->New());
 
   if (mode_ == MODE_ENCODE) {
     SetFdToTextMode(STDIN_FILENO);
@@ -1784,52 +2047,55 @@ bool CommandLineInterface::EncodeOrDecode(const DescriptorPool* pool) {
 }
 
 bool CommandLineInterface::WriteDescriptorSet(
-    const std::vector<const FileDescriptor*> parsed_files) {
+    const std::vector<const FileDescriptor*>& parsed_files) {
   FileDescriptorSet file_set;
 
-  if (imports_in_descriptor_set_) {
-    std::set<const FileDescriptor*> already_seen;
-    for (int i = 0; i < parsed_files.size(); i++) {
-      GetTransitiveDependencies(parsed_files[i],
-                                true,  // Include json_name
-                                source_info_in_descriptor_set_,
-                                &already_seen, file_set.mutable_file());
-    }
-  } else {
-    std::set<const FileDescriptor*> already_seen;
+  std::set<const FileDescriptor*> already_seen;
+  if (!imports_in_descriptor_set_) {
+    // Since we don't want to output transitive dependencies, but we do want
+    // things to be in dependency order, add all dependencies that aren't in
+    // parsed_files to already_seen.  This will short circuit the recursion
+    // in GetTransitiveDependencies.
+    std::set<const FileDescriptor*> to_output;
+    to_output.insert(parsed_files.begin(), parsed_files.end());
     for (int i = 0; i < parsed_files.size(); i++) {
-      if (!already_seen.insert(parsed_files[i]).second) {
-        continue;
-      }
-      FileDescriptorProto* file_proto = file_set.add_file();
-      parsed_files[i]->CopyTo(file_proto);
-      parsed_files[i]->CopyJsonNameTo(file_proto);
-      if (source_info_in_descriptor_set_) {
-        parsed_files[i]->CopySourceCodeInfoTo(file_proto);
+      const FileDescriptor* file = parsed_files[i];
+      for (int i = 0; i < file->dependency_count(); i++) {
+        const FileDescriptor* dependency = file->dependency(i);
+        // if the dependency isn't in parsed files, mark it as already seen
+        if (to_output.find(dependency) == to_output.end()) {
+          already_seen.insert(dependency);
+        }
       }
     }
   }
+  for (int i = 0; i < parsed_files.size(); i++) {
+    GetTransitiveDependencies(parsed_files[i],
+                              true,  // Include json_name
+                              source_info_in_descriptor_set_,
+                              &already_seen, file_set.mutable_file());
+  }
 
   int fd;
   do {
-    fd = open(descriptor_set_name_.c_str(),
+    fd = open(descriptor_set_out_name_.c_str(),
               O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
   } while (fd < 0 && errno == EINTR);
 
   if (fd < 0) {
-    perror(descriptor_set_name_.c_str());
+    perror(descriptor_set_out_name_.c_str());
     return false;
   }
 
   io::FileOutputStream out(fd);
   if (!file_set.SerializeToZeroCopyStream(&out)) {
-    std::cerr << descriptor_set_name_ << ": " << strerror(out.GetErrno())
+    std::cerr << descriptor_set_out_name_ << ": " << strerror(out.GetErrno())
               << std::endl;
     out.Close();
     return false;
   }
   if (!out.Close()) {
-    std::cerr << descriptor_set_name_ << ": " << strerror(out.GetErrno())
+    std::cerr << descriptor_set_out_name_ << ": " << strerror(out.GetErrno())
               << std::endl;
     return false;
   }
diff --git a/src/google/protobuf/compiler/command_line_interface.h b/src/google/protobuf/compiler/command_line_interface.h
index 8f8c2682..7d3037a9 100644
--- a/src/google/protobuf/compiler/command_line_interface.h
+++ b/src/google/protobuf/compiler/command_line_interface.h
@@ -52,17 +52,16 @@ namespace protobuf {
 class Descriptor;            // descriptor.h
 class DescriptorPool;        // descriptor.h
 class FileDescriptor;        // descriptor.h
+class FileDescriptorSet;     // descriptor.h
 class FileDescriptorProto;   // descriptor.pb.h
 template<typename T> class RepeatedPtrField;  // repeated_field.h
+class SimpleDescriptorDatabase;               // descriptor_database.h
 
-}  // namespace protobuf
-
-namespace protobuf {
 namespace compiler {
 
-class CodeGenerator;        // code_generator.h
-class GeneratorContext;      // code_generator.h
-class DiskSourceTree;       // importer.h
+class CodeGenerator;     // code_generator.h
+class GeneratorContext;  // code_generator.h
+class DiskSourceTree;    // importer.h
 
 // This class implements the command-line interface to the protocol compiler.
 // It is designed to make it very easy to create a custom protocol compiler
@@ -91,9 +90,21 @@ class DiskSourceTree;       // importer.h
 // The compiler is invoked with syntax like:
 //   protoc --cpp_out=outdir --foo_out=outdir --proto_path=src src/foo.proto
 //
+// The .proto file to compile can be specified on the command line using either
+// its physical file path, or a virtual path relative to a diretory specified
+// in --proto_path. For example, for src/foo.proto, the following two protoc
+// invocations work the same way:
+//   1. protoc --proto_path=src src/foo.proto (physical file path)
+//   2. protoc --proto_path=src foo.proto (virtual path relative to src)
+//
+// If a file path can be interpreted both as a physical file path and as a
+// relative virtual path, the physical file path takes precendence.
+//
 // For a full description of the command-line syntax, invoke it with --help.
 class LIBPROTOC_EXPORT CommandLineInterface {
  public:
+  static const char* const kPathSeparator;
+
   CommandLineInterface();
   ~CommandLineInterface();
 
@@ -175,17 +186,11 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // it calls strerror().  I'm not sure why you'd want to do this anyway.
   int Run(int argc, const char* const argv[]);
 
-  // Call SetInputsAreCwdRelative(true) if the input files given on the command
-  // line should be interpreted relative to the proto import path specified
-  // using --proto_path or -I flags.  Otherwise, input file names will be
-  // interpreted relative to the current working directory (or as absolute
-  // paths if they start with '/'), though they must still reside inside
-  // a directory given by --proto_path or the compiler will fail.  The latter
-  // mode is generally more intuitive and easier to use, especially e.g. when
-  // defining implicit rules in Makefiles.
-  void SetInputsAreProtoPathRelative(bool enable) {
-    inputs_are_proto_path_relative_ = enable;
-  }
+  // DEPRECATED. Calling this method has no effect. Protocol compiler now
+  // always try to find the .proto file relative to the current directory
+  // first and if the file is not found, it will then treat the input path
+  // as a virutal path.
+  void SetInputsAreProtoPathRelative(bool /* enable */) {}
 
   // Provides some text which will be printed when the --version flag is
   // used.  The version of libprotoc will also be printed on the next line
@@ -222,6 +227,9 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // Parse all command-line arguments.
   ParseArgumentStatus ParseArguments(int argc, const char* const argv[]);
 
+  // Read an argument file and append the file's content to the list of
+  // arguments. Return false if the file cannot be read.
+  bool ExpandArgumentFile(const string& file, std::vector<string>* arguments);
 
   // Parses a command-line argument into a name/value pair.  Returns
   // true if the next argument in the argv should be used as the value,
@@ -243,6 +251,16 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // Print the --help text to stderr.
   void PrintHelpText();
 
+  // Loads proto_path_ into the provided source_tree.
+  bool InitializeDiskSourceTree(DiskSourceTree* source_tree);
+
+  // Loads descriptor_set_in into the provided database
+  bool PopulateSimpleDescriptorDatabase(SimpleDescriptorDatabase* database);
+
+  // Parses input_files_ into parsed_files
+  bool ParseInputFiles(DescriptorPool* descriptor_pool,
+                       std::vector<const FileDescriptor*>* parsed_files);
+
   // Generate the given output file from the given input.
   struct OutputDirective;  // see below
   bool GenerateOutput(const std::vector<const FileDescriptor*>& parsed_files,
@@ -258,7 +276,7 @@ class LIBPROTOC_EXPORT CommandLineInterface {
 
   // Implements the --descriptor_set_out option.
   bool WriteDescriptorSet(
-      const std::vector<const FileDescriptor*> parsed_files);
+      const std::vector<const FileDescriptor*>& parsed_files);
 
   // Implements the --dependency_out option
   bool GenerateDependencyManifestFile(
@@ -383,9 +401,13 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // decoding.  (Empty string indicates --decode_raw.)
   string codec_type_;
 
+  // If --descriptor_set_in was given, these are filenames containing
+  // parsed FileDescriptorSets to be used for loading protos.  Otherwise, empty.
+  std::vector<string> descriptor_set_in_names_;
+
   // If --descriptor_set_out was given, this is the filename to which the
   // FileDescriptorSet should be written.  Otherwise, empty.
-  string descriptor_set_name_;
+  string descriptor_set_out_name_;
 
   // If --dependency_out was given, this is the path to the file where the
   // dependency file will be written. Otherwise, empty.
@@ -403,9 +425,6 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // Was the --disallow_services flag used?
   bool disallow_services_;
 
-  // See SetInputsAreProtoPathRelative().
-  bool inputs_are_proto_path_relative_;
-
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(CommandLineInterface);
 };
 
diff --git a/src/google/protobuf/compiler/command_line_interface_unittest.cc b/src/google/protobuf/compiler/command_line_interface_unittest.cc
index cce1018a..41eb244a 100644
--- a/src/google/protobuf/compiler/command_line_interface_unittest.cc
+++ b/src/google/protobuf/compiler/command_line_interface_unittest.cc
@@ -32,59 +32,56 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <fcntl.h>
-#ifdef _MSC_VER
-#include <io.h>
-#else
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#ifndef _MSC_VER
 #include <unistd.h>
 #endif
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/compiler/command_line_interface.h>
-#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/testing/file.h>
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/compiler/mock_code_generator.h>
 #include <google/protobuf/compiler/subprocess.h>
-#include <google/protobuf/io/printer.h>
+#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/compiler/command_line_interface.h>
 #include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/testing/file.h>
-#include <google/protobuf/stubs/stringprintf.h>
-#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
 #include <google/protobuf/stubs/substitute.h>
 
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/io_win32.h>
 
 namespace google {
 namespace protobuf {
 namespace compiler {
 
+#if defined(_WIN32)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::dup;
+using google::protobuf::internal::win32::dup2;
+using google::protobuf::internal::win32::close;
+using google::protobuf::internal::win32::open;
+using google::protobuf::internal::win32::write;
+#endif
+
 // Disable the whole test when we use tcmalloc for "draconian" heap checks, in
 // which case tcmalloc will print warnings that fail the plugin tests.
 #if !GOOGLE_PROTOBUF_HEAP_CHECK_DRACONIAN
 
-#if defined(_WIN32)
-#ifndef STDIN_FILENO
-#define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO 1
-#endif
-#ifndef F_OK
-#define F_OK 00  // not defined by MSVC for whatever reason
-#endif
-#endif
 
 namespace {
 
@@ -101,7 +98,7 @@ class CommandLineInterfaceTest : public testing::Test {
   // command is automatically split on spaces, and the string "$tmpdir"
   // is replaced with TestTempDir().
   void Run(const string& command);
-  void RunWithArgs(vector<string> args);
+  void RunWithArgs(std::vector<string> args);
 
   // -----------------------------------------------------------------
   // Methods to set up the test (called before Run()).
@@ -129,10 +126,6 @@ class CommandLineInterfaceTest : public testing::Test {
   // google3.
 #endif  // !PROTOBUF_OPENSOURCE
 
-  void SetInputsAreProtoPathRelative(bool enable) {
-    cli_.SetInputsAreProtoPathRelative(enable);
-  }
-
   // -----------------------------------------------------------------
   // Methods to check the test results (called after Run()).
 
@@ -156,6 +149,11 @@ class CommandLineInterfaceTest : public testing::Test {
   // Checks that the captured stdout is the same as the expected_text.
   void ExpectCapturedStdout(const string& expected_text);
 
+  // Checks that Run() returned zero and the stdout contains the given
+  // substring.
+  void ExpectCapturedStdoutSubstringWithZeroReturnCode(
+      const string& expected_substring);
+
   // Returns true if ExpectErrorSubstring(expected_substring) would pass, but
   // does not fail otherwise.
   bool HasAlternateErrorSubstring(const string& expected_substring);
@@ -187,12 +185,17 @@ class CommandLineInterfaceTest : public testing::Test {
                                      const string& insertions,
                                      const string& proto_name,
                                      const string& message_name);
+  void CheckGeneratedAnnotations(const string& name, const string& file);
 
   void ExpectNullCodeGeneratorCalled(const string& parameter);
 
+
   void ReadDescriptorSet(const string& filename,
                          FileDescriptorSet* descriptor_set);
 
+  void WriteDescriptorSet(const string& filename,
+                          const FileDescriptorSet* descriptor_set);
+
   void ExpectFileContent(const string& filename,
                          const string& content);
 
@@ -246,11 +249,6 @@ class CommandLineInterfaceTest::NullCodeGenerator : public CodeGenerator {
 // ===================================================================
 
 void CommandLineInterfaceTest::SetUp() {
-  // Most of these tests were written before this option was added, so we
-  // run with the option on (which used to be the only way) except in certain
-  // tests where we turn it off.
-  cli_.SetInputsAreProtoPathRelative(true);
-
   temp_directory_ = TestTempDir() + "/proto2_cli_test_temp";
 
   // If the temp directory already exists, it must be left over from a
@@ -276,6 +274,7 @@ void CommandLineInterfaceTest::SetUp() {
   mock_generators_to_delete_.push_back(generator);
   cli_.RegisterGenerator("--null_out", generator, "Null output.");
 
+
   disallow_plugins_ = false;
 }
 
@@ -296,7 +295,7 @@ void CommandLineInterfaceTest::Run(const string& command) {
   RunWithArgs(Split(command, " ", true));
 }
 
-void CommandLineInterfaceTest::RunWithArgs(vector<string> args) {
+void CommandLineInterfaceTest::RunWithArgs(std::vector<string> args) {
   if (!disallow_plugins_) {
     cli_.AllowPlugins("prefix-");
 #ifndef GOOGLE_THIRD_PARTY_PROTOBUF
@@ -342,7 +341,7 @@ void CommandLineInterfaceTest::RunWithArgs(vector<string> args) {
     }
   }
 
-  google::protobuf::scoped_array<const char * > argv(new const char* [args.size()]);
+  std::unique_ptr<const char * []> argv(new const char* [args.size()]);
 
   for (int i = 0; i < args.size(); i++) {
     args[i] = StringReplace(args[i], "$tmpdir", temp_directory_, true);
@@ -466,12 +465,18 @@ void CommandLineInterfaceTest::ExpectGeneratedWithInsertions(
       proto_name, temp_directory_);
 }
 
+void CommandLineInterfaceTest::CheckGeneratedAnnotations(const string& name,
+                                                         const string& file) {
+  MockCodeGenerator::CheckGeneratedAnnotations(name, file, temp_directory_);
+}
+
 void CommandLineInterfaceTest::ExpectNullCodeGeneratorCalled(
     const string& parameter) {
   EXPECT_TRUE(null_generator_->called_);
   EXPECT_EQ(parameter, null_generator_->parameter_);
 }
 
+
 void CommandLineInterfaceTest::ReadDescriptorSet(
     const string& filename, FileDescriptorSet* descriptor_set) {
   string path = temp_directory_ + "/" + filename;
@@ -483,11 +488,24 @@ void CommandLineInterfaceTest::ReadDescriptorSet(
   }
 }
 
+void CommandLineInterfaceTest::WriteDescriptorSet(
+    const string& filename, const FileDescriptorSet* descriptor_set) {
+  string binary_proto;
+  GOOGLE_CHECK(descriptor_set->SerializeToString(&binary_proto));
+  CreateTempFile(filename, binary_proto);
+}
+
 void CommandLineInterfaceTest::ExpectCapturedStdout(
     const string& expected_text) {
   EXPECT_EQ(expected_text, captured_stdout_);
 }
 
+void CommandLineInterfaceTest::ExpectCapturedStdoutSubstringWithZeroReturnCode(
+    const string& expected_substring) {
+  EXPECT_EQ(0, return_code_);
+  EXPECT_PRED_FORMAT2(
+      testing::IsSubstring, expected_substring, captured_stdout_);
+}
 
 void CommandLineInterfaceTest::ExpectFileContent(
     const string& filename, const string& content) {
@@ -515,6 +533,22 @@ TEST_F(CommandLineInterfaceTest, BasicOutput) {
   ExpectGenerated("test_generator", "", "foo.proto", "Foo");
 }
 
+TEST_F(CommandLineInterfaceTest, BasicOutput_DescriptorSetIn) {
+  // Test that the common case works.
+  FileDescriptorSet file_descriptor_set;
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  WriteDescriptorSet("foo.bin", &file_descriptor_set);
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+
+  ExpectNoErrors();
+  ExpectGenerated("test_generator", "", "foo.proto", "Foo");
+}
+
 TEST_F(CommandLineInterfaceTest, BasicPlugin) {
   // Test that basic plugins work.
 
@@ -529,6 +563,23 @@ TEST_F(CommandLineInterfaceTest, BasicPlugin) {
   ExpectGenerated("test_plugin", "", "foo.proto", "Foo");
 }
 
+TEST_F(CommandLineInterfaceTest, BasicPlugin_DescriptorSetIn) {
+  // Test that basic plugins work.
+
+  FileDescriptorSet file_descriptor_set;
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  WriteDescriptorSet("foo.bin", &file_descriptor_set);
+
+  Run("protocol_compiler --plug_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+
+  ExpectNoErrors();
+  ExpectGenerated("test_plugin", "", "foo.proto", "Foo");
+}
+
 TEST_F(CommandLineInterfaceTest, GeneratorAndPlugin) {
   // Invoke a generator and a plugin at the same time.
 
@@ -544,6 +595,24 @@ TEST_F(CommandLineInterfaceTest, GeneratorAndPlugin) {
   ExpectGenerated("test_plugin", "", "foo.proto", "Foo");
 }
 
+TEST_F(CommandLineInterfaceTest, GeneratorAndPlugin_DescriptorSetIn) {
+  // Invoke a generator and a plugin at the same time.
+
+  FileDescriptorSet file_descriptor_set;
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  WriteDescriptorSet("foo.bin", &file_descriptor_set);
+
+  Run("protocol_compiler --test_out=$tmpdir --plug_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+
+  ExpectNoErrors();
+  ExpectGenerated("test_generator", "", "foo.proto", "Foo");
+  ExpectGenerated("test_plugin", "", "foo.proto", "Foo");
+}
+
 TEST_F(CommandLineInterfaceTest, MultipleInputs) {
   // Test parsing multiple input files.
 
@@ -568,6 +637,34 @@ TEST_F(CommandLineInterfaceTest, MultipleInputs) {
                                     "bar.proto", "Bar");
 }
 
+TEST_F(CommandLineInterfaceTest, MultipleInputs_DescriptorSetIn) {
+  // Test parsing multiple input files.
+  FileDescriptorSet file_descriptor_set;
+
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("bar.proto");
+  file_descriptor_proto->add_message_type()->set_name("Bar");
+
+  WriteDescriptorSet("foo.bin", &file_descriptor_set);
+
+  Run("protocol_compiler --test_out=$tmpdir --plug_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto bar.proto");
+
+  ExpectNoErrors();
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+}
+
 TEST_F(CommandLineInterfaceTest, MultipleInputsWithImport) {
   // Test parsing multiple input files with an import of a separate file.
 
@@ -598,6 +695,165 @@ TEST_F(CommandLineInterfaceTest, MultipleInputsWithImport) {
                                     "bar.proto", "Bar");
 }
 
+TEST_F(CommandLineInterfaceTest, MultipleInputsWithImport_DescriptorSetIn) {
+  // Test parsing multiple input files with an import of a separate file.
+  FileDescriptorSet file_descriptor_set;
+
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("bar.proto");
+  file_descriptor_proto->add_dependency("baz.proto");
+  DescriptorProto* message = file_descriptor_proto->add_message_type();
+  message->set_name("Bar");
+  FieldDescriptorProto* field = message->add_field();
+  field->set_type_name("Baz");
+  field->set_name("a");
+  field->set_number(1);
+
+  WriteDescriptorSet("foo_and_bar.bin", &file_descriptor_set);
+
+  file_descriptor_set.clear_file();
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("baz.proto");
+  file_descriptor_proto->add_message_type()->set_name("Baz");
+
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("bat.proto");
+  file_descriptor_proto->add_dependency("baz.proto");
+  message = file_descriptor_proto->add_message_type();
+  message->set_name("Bat");
+  field = message->add_field();
+  field->set_type_name("Baz");
+  field->set_name("a");
+  field->set_number(1);
+
+  WriteDescriptorSet("baz_and_bat.bin", &file_descriptor_set);
+  Run(strings::Substitute(
+      "protocol_compiler --test_out=$$tmpdir --plug_out=$$tmpdir "
+      "--descriptor_set_in=$0 foo.proto bar.proto",
+      string("$tmpdir/foo_and_bar.bin") +
+      CommandLineInterface::kPathSeparator +
+      "$tmpdir/baz_and_bat.bin"));
+
+  ExpectNoErrors();
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+
+  Run(strings::Substitute(
+      "protocol_compiler --test_out=$$tmpdir --plug_out=$$tmpdir "
+      "--descriptor_set_in=$0 baz.proto bat.proto",
+      string("$tmpdir/foo_and_bar.bin") +
+      CommandLineInterface::kPathSeparator +
+      "$tmpdir/baz_and_bat.bin"));
+
+  ExpectNoErrors();
+  ExpectGeneratedWithMultipleInputs("test_generator", "baz.proto,bat.proto",
+                                    "baz.proto", "Baz");
+  ExpectGeneratedWithMultipleInputs("test_generator", "baz.proto,bat.proto",
+                                    "bat.proto", "Bat");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "baz.proto,bat.proto",
+                                    "baz.proto", "Baz");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "baz.proto,bat.proto",
+                                    "bat.proto", "Bat");
+}
+
+TEST_F(CommandLineInterfaceTest,
+       MultipleInputsWithImport_DescriptorSetIn_DuplicateFileDescriptor) {
+  // Test parsing multiple input files with an import of a separate file.
+  FileDescriptorSet file_descriptor_set;
+
+  FileDescriptorProto foo_file_descriptor_proto;
+  foo_file_descriptor_proto.set_name("foo.proto");
+  foo_file_descriptor_proto.add_message_type()->set_name("Foo");
+
+  file_descriptor_set.add_file()->CopyFrom(foo_file_descriptor_proto);
+
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("bar.proto");
+  file_descriptor_proto->add_dependency("baz.proto");
+  file_descriptor_proto->add_dependency("foo.proto");
+  DescriptorProto* message = file_descriptor_proto->add_message_type();
+  message->set_name("Bar");
+  FieldDescriptorProto* field = message->add_field();
+  field->set_type_name("Baz");
+  field->set_name("a");
+  field->set_number(1);
+  field = message->add_field();
+  field->set_type_name("Foo");
+  field->set_name("f");
+  field->set_number(2);
+  WriteDescriptorSet("foo_and_bar.bin", &file_descriptor_set);
+
+  file_descriptor_set.clear_file();
+  file_descriptor_set.add_file()->CopyFrom(foo_file_descriptor_proto);
+
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("baz.proto");
+  file_descriptor_proto->add_dependency("foo.proto");
+  message = file_descriptor_proto->add_message_type();
+  message->set_name("Baz");
+  field = message->add_field();
+  field->set_type_name("Foo");
+  field->set_name("f");
+  field->set_number(1);
+  WriteDescriptorSet("foo_and_baz.bin", &file_descriptor_set);
+
+  Run(strings::Substitute(
+      "protocol_compiler --test_out=$$tmpdir --plug_out=$$tmpdir "
+      "--descriptor_set_in=$0 bar.proto",
+      string("$tmpdir/foo_and_bar.bin") +
+      CommandLineInterface::kPathSeparator +
+      "$tmpdir/foo_and_baz.bin"));
+
+  ExpectNoErrors();
+  ExpectGenerated("test_generator", "", "bar.proto", "Bar");
+  ExpectGenerated("test_plugin", "", "bar.proto", "Bar");
+}
+
+TEST_F(CommandLineInterfaceTest,
+       MultipleInputsWithImport_DescriptorSetIn_MissingImport) {
+  // Test parsing multiple input files with an import of a separate file.
+  FileDescriptorSet file_descriptor_set;
+
+  FileDescriptorProto* file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("foo.proto");
+  file_descriptor_proto->add_message_type()->set_name("Foo");
+
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("bar.proto");
+  file_descriptor_proto->add_dependency("baz.proto");
+  DescriptorProto* message = file_descriptor_proto->add_message_type();
+  message->set_name("Bar");
+  FieldDescriptorProto* field = message->add_field();
+  field->set_type_name("Baz");
+  field->set_name("a");
+  field->set_number(1);
+
+  WriteDescriptorSet("foo_and_bar.bin", &file_descriptor_set);
+
+  file_descriptor_set.clear_file();
+  file_descriptor_proto = file_descriptor_set.add_file();
+  file_descriptor_proto->set_name("baz.proto");
+  file_descriptor_proto->add_message_type()->set_name("Baz");
+
+  WriteDescriptorSet("baz.bin", &file_descriptor_set);
+  Run("protocol_compiler --test_out=$tmpdir --plug_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo_and_bar.bin "
+      "foo.proto bar.proto");
+  ExpectErrorSubstring(
+      "bar.proto: Import \"baz.proto\" was not found or had errors.");
+  ExpectErrorSubstring("bar.proto: \"Baz\" is not defined.");
+}
+
 TEST_F(CommandLineInterfaceTest, CreateDirectory) {
   // Test that when we output to a sub-directory, it is created.
 
@@ -744,6 +1000,25 @@ TEST_F(CommandLineInterfaceTest, Insert) {
       "foo.proto", "Foo");
 }
 
+TEST_F(CommandLineInterfaceTest, InsertWithAnnotationFixup) {
+  // Check that annotation spans are updated after insertions.
+
+  CreateTempFile("foo.proto",
+                 "syntax = \"proto2\";\n"
+                 "message MockCodeGenerator_Annotate {}\n");
+
+  Run("protocol_compiler "
+      "--test_out=TestParameter:$tmpdir "
+      "--plug_out=TestPluginParameter:$tmpdir "
+      "--test_out=insert=test_generator,test_plugin:$tmpdir "
+      "--plug_out=insert=test_generator,test_plugin:$tmpdir "
+      "--proto_path=$tmpdir foo.proto");
+
+  ExpectNoErrors();
+  CheckGeneratedAnnotations("test_generator", "foo.proto");
+  CheckGeneratedAnnotations("test_plugin", "foo.proto");
+}
+
 #if defined(_WIN32)
 
 TEST_F(CommandLineInterfaceTest, WindowsOutputPath) {
@@ -829,17 +1104,11 @@ TEST_F(CommandLineInterfaceTest, ColonDelimitedPath) {
     "}\n");
   CreateTempFile("b/foo.proto", "this should not be parsed\n");
 
-#undef PATH_SEPARATOR
-#if defined(_WIN32)
-#define PATH_SEPARATOR ";"
-#else
-#define PATH_SEPARATOR ":"
-#endif
-
-  Run("protocol_compiler --test_out=$tmpdir "
-      "--proto_path=$tmpdir/a" PATH_SEPARATOR "$tmpdir/b foo.proto");
-
-#undef PATH_SEPARATOR
+  Run(strings::Substitute(
+      "protocol_compiler --test_out=$$tmpdir --proto_path=$0 foo.proto",
+      string("$tmpdir/a") +
+      CommandLineInterface::kPathSeparator +
+      "$tmpdir/b"));
 
   ExpectNoErrors();
   ExpectGenerated("test_generator", "", "foo.proto", "Foo");
@@ -1034,7 +1303,7 @@ TEST_F(CommandLineInterfaceTest, DirectDependencies_CustomErrorMessage) {
                  "syntax = \"proto2\";\n"
                  "message Bar { optional string text = 1; }");
 
-  vector<string> commands;
+  std::vector<string> commands;
   commands.push_back("protocol_compiler");
   commands.push_back("--test_out=$tmpdir");
   commands.push_back("--proto_path=$tmpdir");
@@ -1049,8 +1318,6 @@ TEST_F(CommandLineInterfaceTest, DirectDependencies_CustomErrorMessage) {
 TEST_F(CommandLineInterfaceTest, CwdRelativeInputs) {
   // Test that we can accept working-directory-relative input files.
 
-  SetInputsAreProtoPathRelative(false);
-
   CreateTempFile("foo.proto",
     "syntax = \"proto2\";\n"
     "message Foo {}\n");
@@ -1117,15 +1384,17 @@ TEST_F(CommandLineInterfaceTest, WriteDescriptorSetWithDuplicates) {
   ReadDescriptorSet("descriptor_set", &descriptor_set);
   if (HasFatalFailure()) return;
   EXPECT_EQ(3, descriptor_set.file_size());
-  EXPECT_EQ("bar.proto", descriptor_set.file(0).name());
-  EXPECT_EQ("foo.proto", descriptor_set.file(1).name());
+  // foo should come first since the output is in dependency order.
+  // since bar and baz are unordered, they should be in command line order.
+  EXPECT_EQ("foo.proto", descriptor_set.file(0).name());
+  EXPECT_EQ("bar.proto", descriptor_set.file(1).name());
   EXPECT_EQ("baz.proto", descriptor_set.file(2).name());
   // Descriptor set should not have source code info.
   EXPECT_FALSE(descriptor_set.file(0).has_source_code_info());
   // Descriptor set should have json_name.
-  EXPECT_EQ("Bar", descriptor_set.file(0).message_type(0).name());
-  EXPECT_EQ("foo", descriptor_set.file(0).message_type(0).field(0).name());
-  EXPECT_TRUE(descriptor_set.file(0).message_type(0).field(0).has_json_name());
+  EXPECT_EQ("Bar", descriptor_set.file(1).message_type(0).name());
+  EXPECT_EQ("foo", descriptor_set.file(1).message_type(0).field(0).name());
+  EXPECT_TRUE(descriptor_set.file(1).message_type(0).field(0).has_json_name());
 }
 
 TEST_F(CommandLineInterfaceTest, WriteDescriptorSetWithSourceInfo) {
@@ -1289,6 +1558,36 @@ TEST_F(CommandLineInterfaceTest, WriteDependencyManifestFileForAbsolutePath) {
 }
 #endif  // !_WIN32
 
+TEST_F(CommandLineInterfaceTest, TestArgumentFile) {
+  // Test parsing multiple input files using an argument file.
+
+  CreateTempFile("foo.proto",
+    "syntax = \"proto2\";\n"
+    "message Foo {}\n");
+  CreateTempFile("bar.proto",
+    "syntax = \"proto2\";\n"
+    "message Bar {}\n");
+  CreateTempFile("arguments.txt",
+                 "--test_out=$tmpdir\n"
+                 "--plug_out=$tmpdir\n"
+                 "--proto_path=$tmpdir\n"
+                 "--direct_dependencies_violation_msg=%s is not imported\n"
+                 "foo.proto\n"
+                 "bar.proto");
+
+  Run("protocol_compiler @$tmpdir/arguments.txt");
+
+  ExpectNoErrors();
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_generator", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "foo.proto", "Foo");
+  ExpectGeneratedWithMultipleInputs("test_plugin", "foo.proto,bar.proto",
+                                    "bar.proto", "Bar");
+}
+
 
 // -------------------------------------------------------------------
 
@@ -1306,6 +1605,17 @@ TEST_F(CommandLineInterfaceTest, ParseErrors) {
     "foo.proto:2:1: Expected top-level statement (e.g. \"message\").\n");
 }
 
+TEST_F(CommandLineInterfaceTest, ParseErrors_DescriptorSetIn) {
+  // Test that parse errors are reported.
+  CreateTempFile("foo.bin", "not a FileDescriptorSet");
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+
+  ExpectErrorText(
+    "$tmpdir/foo.bin: Unable to parse.\n");
+}
+
 TEST_F(CommandLineInterfaceTest, ParseErrorsMultipleFiles) {
   // Test that parse errors are reported from multiple files.
 
@@ -1352,16 +1662,23 @@ TEST_F(CommandLineInterfaceTest, InputNotFoundError) {
   Run("protocol_compiler --test_out=$tmpdir "
       "--proto_path=$tmpdir foo.proto");
 
+  ExpectErrorText("foo.proto: No such file or directory\n");
+}
+
+TEST_F(CommandLineInterfaceTest, InputNotFoundError_DescriptorSetIn) {
+  // Test what happens if the input file is not found.
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+
   ExpectErrorText(
-    "foo.proto: File not found.\n");
+    "$tmpdir/foo.bin: No such file or directory\n");
 }
 
 TEST_F(CommandLineInterfaceTest, CwdRelativeInputNotFoundError) {
   // Test what happens when a working-directory-relative input file is not
   // found.
 
-  SetInputsAreProtoPathRelative(false);
-
   Run("protocol_compiler --test_out=$tmpdir "
       "--proto_path=$tmpdir $tmpdir/foo.proto");
 
@@ -1373,8 +1690,6 @@ TEST_F(CommandLineInterfaceTest, CwdRelativeInputNotMappedError) {
   // Test what happens when a working-directory-relative input file is not
   // mapped to a virtual path.
 
-  SetInputsAreProtoPathRelative(false);
-
   CreateTempFile("foo.proto",
     "syntax = \"proto2\";\n"
     "message Foo {}\n");
@@ -1399,8 +1714,6 @@ TEST_F(CommandLineInterfaceTest, CwdRelativeInputNotFoundAndNotMappedError) {
   // Check what happens if the input file is not found *and* is not mapped
   // in the proto_path.
 
-  SetInputsAreProtoPathRelative(false);
-
   // Create a directory called "bar" so that we can point --proto_path at it.
   CreateTempFile("bar/dummy", "");
 
@@ -1415,8 +1728,6 @@ TEST_F(CommandLineInterfaceTest, CwdRelativeInputShadowedError) {
   // Test what happens when a working-directory-relative input file is shadowed
   // by another file in the virtual path.
 
-  SetInputsAreProtoPathRelative(false);
-
   CreateTempFile("foo/foo.proto",
     "syntax = \"proto2\";\n"
     "message Foo {}\n");
@@ -1442,8 +1753,34 @@ TEST_F(CommandLineInterfaceTest, ProtoPathNotFoundError) {
       "--proto_path=$tmpdir/foo foo.proto");
 
   ExpectErrorText(
-    "$tmpdir/foo: warning: directory does not exist.\n"
-    "foo.proto: File not found.\n");
+      "$tmpdir/foo: warning: directory does not exist.\n"
+      "foo.proto: No such file or directory\n");
+}
+
+TEST_F(CommandLineInterfaceTest, ProtoPathAndDescriptorSetIn) {
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--proto_path=$tmpdir --descriptor_set_in=$tmpdir/foo.bin foo.proto");
+  ExpectErrorText(
+      "Only one of --descriptor_set_in and --proto_path can be specified.\n");
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin --proto_path=$tmpdir foo.proto");
+  ExpectErrorText(
+      "Only one of --proto_path and --descriptor_set_in can be specified.\n");
+}
+
+TEST_F(CommandLineInterfaceTest, ProtoPathAndDependencyOut) {
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--dependency_out=$tmpdir/manifest "
+      "--descriptor_set_in=$tmpdir/foo.bin foo.proto");
+  ExpectErrorText(
+      "--descriptor_set_in cannot be used with --dependency_out.\n");
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--descriptor_set_in=$tmpdir/foo.bin "
+      "--dependency_out=$tmpdir/manifest foo.proto");
+  ExpectErrorText(
+      "--dependency_out cannot be used with --descriptor_set_in.\n");
 }
 
 TEST_F(CommandLineInterfaceTest, MissingInputError) {
@@ -1703,11 +2040,11 @@ TEST_F(CommandLineInterfaceTest, GeneratorPluginNotAllowed) {
 TEST_F(CommandLineInterfaceTest, HelpText) {
   Run("test_exec_name --help");
 
-  ExpectErrorSubstringWithZeroReturnCode("Usage: test_exec_name ");
-  ExpectErrorSubstringWithZeroReturnCode("--test_out=OUT_DIR");
-  ExpectErrorSubstringWithZeroReturnCode("Test output.");
-  ExpectErrorSubstringWithZeroReturnCode("--alt_out=OUT_DIR");
-  ExpectErrorSubstringWithZeroReturnCode("Alt output.");
+  ExpectCapturedStdoutSubstringWithZeroReturnCode("Usage: test_exec_name ");
+  ExpectCapturedStdoutSubstringWithZeroReturnCode("--test_out=OUT_DIR");
+  ExpectCapturedStdoutSubstringWithZeroReturnCode("Test output.");
+  ExpectCapturedStdoutSubstringWithZeroReturnCode("--alt_out=OUT_DIR");
+  ExpectCapturedStdoutSubstringWithZeroReturnCode("Alt output.");
 }
 
 TEST_F(CommandLineInterfaceTest, GccFormatErrors) {
@@ -1893,9 +2230,16 @@ TEST_F(CommandLineInterfaceTest, PrintFreeFieldNumbers) {
 // test as a shell script, but we'd like to be able to run the test on
 // platforms that don't have a Bourne-compatible shell available (especially
 // Windows/MSVC).
-class EncodeDecodeTest : public testing::Test {
+
+enum EncodeDecodeTestMode {
+  PROTO_PATH,
+  DESCRIPTOR_SET_IN
+};
+
+class EncodeDecodeTest : public testing::TestWithParam<EncodeDecodeTestMode> {
  protected:
   virtual void SetUp() {
+    WriteUnittestProtoDescriptorSet();
     duped_stdin_ = dup(STDIN_FILENO);
   }
 
@@ -1938,15 +2282,25 @@ class EncodeDecodeTest : public testing::Test {
     std::vector<string> args;
     args.push_back("protoc");
     SplitStringUsing(command, " ", &args);
-    args.push_back("--proto_path=" + TestSourceDir());
+    switch (GetParam()) {
+      case PROTO_PATH:
+        args.push_back("--proto_path=" + TestSourceDir());
+        break;
+      case DESCRIPTOR_SET_IN:
+        args.push_back(StrCat(
+            "--descriptor_set_in=",
+            unittest_proto_descriptor_set_filename_));
+        break;
+      default:
+        ADD_FAILURE() << "unexpected EncodeDecodeTestMode: " << GetParam();
+    }
 
-    google::protobuf::scoped_array<const char * > argv(new const char* [args.size()]);
+    std::unique_ptr<const char * []> argv(new const char* [args.size()]);
     for (int i = 0; i < args.size(); i++) {
       argv[i] = args[i].c_str();
     }
 
     CommandLineInterface cli;
-    cli.SetInputsAreProtoPathRelative(true);
 
     CaptureTestStdout();
     CaptureTestStderr();
@@ -1984,12 +2338,37 @@ class EncodeDecodeTest : public testing::Test {
   }
 
  private:
+  void WriteUnittestProtoDescriptorSet() {
+    unittest_proto_descriptor_set_filename_ =
+        TestTempDir() + "/unittest_proto_descriptor_set.bin";
+    FileDescriptorSet file_descriptor_set;
+    protobuf_unittest::TestAllTypes test_all_types;
+    test_all_types.descriptor()->file()->CopyTo(file_descriptor_set.add_file());
+
+    protobuf_unittest_import::ImportMessage import_message;
+    import_message.descriptor()->file()->CopyTo(file_descriptor_set.add_file());
+
+
+    protobuf_unittest_import::PublicImportMessage public_import_message;
+    public_import_message.descriptor()->file()->CopyTo(
+        file_descriptor_set.add_file());
+    GOOGLE_DCHECK(file_descriptor_set.IsInitialized());
+
+    string binary_proto;
+    GOOGLE_CHECK(file_descriptor_set.SerializeToString(&binary_proto));
+    GOOGLE_CHECK_OK(File::SetContents(
+        unittest_proto_descriptor_set_filename_,
+        binary_proto,
+        true));
+  }
+
   int duped_stdin_;
   string captured_stdout_;
   string captured_stderr_;
+  string unittest_proto_descriptor_set_filename_;
 };
 
-TEST_F(EncodeDecodeTest, Encode) {
+TEST_P(EncodeDecodeTest, Encode) {
   RedirectStdinFromFile(TestSourceDir() + "/google/protobuf/"
     "testdata/text_format_unittest_data_oneof_implemented.txt");
   EXPECT_TRUE(Run("google/protobuf/unittest.proto "
@@ -1999,7 +2378,7 @@ TEST_F(EncodeDecodeTest, Encode) {
   ExpectStderrMatchesText("");
 }
 
-TEST_F(EncodeDecodeTest, Decode) {
+TEST_P(EncodeDecodeTest, Decode) {
   RedirectStdinFromFile(TestSourceDir() +
     "/google/protobuf/testdata/golden_message_oneof_implemented");
   EXPECT_TRUE(Run("google/protobuf/unittest.proto "
@@ -2010,7 +2389,7 @@ TEST_F(EncodeDecodeTest, Decode) {
   ExpectStderrMatchesText("");
 }
 
-TEST_F(EncodeDecodeTest, Partial) {
+TEST_P(EncodeDecodeTest, Partial) {
   RedirectStdinFromText("");
   EXPECT_TRUE(Run("google/protobuf/unittest.proto "
                   "--encode=protobuf_unittest.TestRequired"));
@@ -2019,7 +2398,7 @@ TEST_F(EncodeDecodeTest, Partial) {
     "warning:  Input message is missing required fields:  a, b, c\n");
 }
 
-TEST_F(EncodeDecodeTest, DecodeRaw) {
+TEST_P(EncodeDecodeTest, DecodeRaw) {
   protobuf_unittest::TestAllTypes message;
   message.set_optional_int32(123);
   message.set_optional_string("foo");
@@ -2033,21 +2412,24 @@ TEST_F(EncodeDecodeTest, DecodeRaw) {
   ExpectStderrMatchesText("");
 }
 
-TEST_F(EncodeDecodeTest, UnknownType) {
+TEST_P(EncodeDecodeTest, UnknownType) {
   EXPECT_FALSE(Run("google/protobuf/unittest.proto "
                    "--encode=NoSuchType"));
   ExpectStdoutMatchesText("");
   ExpectStderrMatchesText("Type not defined: NoSuchType\n");
 }
 
-TEST_F(EncodeDecodeTest, ProtoParseError) {
+TEST_P(EncodeDecodeTest, ProtoParseError) {
   EXPECT_FALSE(Run("google/protobuf/no_such_file.proto "
                    "--encode=NoSuchType"));
   ExpectStdoutMatchesText("");
   ExpectStderrMatchesText(
-    "google/protobuf/no_such_file.proto: File not found.\n");
+      "google/protobuf/no_such_file.proto: No such file or directory\n");
 }
 
+INSTANTIATE_TEST_CASE_P(FileDescriptorSetSource,
+                        EncodeDecodeTest,
+                        testing::Values(PROTO_PATH, DESCRIPTOR_SET_IN));
 }  // anonymous namespace
 
 #endif  // !GOOGLE_PROTOBUF_HEAP_CHECK_DRACONIAN
diff --git a/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc b/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
index bf4e5831..4e150fe3 100644
--- a/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
@@ -44,14 +44,14 @@
 
 #include <map>
 
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_generator.h>
 #include <google/protobuf/compiler/importer.h>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/stubs/substitute.h>
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/stl_util.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/stubs/substitute.h>
 
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/testing/file.h>
@@ -98,9 +98,10 @@ class MockGeneratorContext : public GeneratorContext {
         File::GetContents(TestSourceDir() + "/" + physical_filename,
                           &actual_contents, true));
     EXPECT_TRUE(actual_contents == *expected_contents)
-      << physical_filename << " needs to be regenerated.  Please run "
-         "generate_descriptor_proto.sh. Then add this file "
-         "to your CL.";
+        << physical_filename
+        << " needs to be regenerated.  Please run "
+           "generate_descriptor_proto.sh. "
+           "Then add this file to your CL.";
   }
 
   // implements GeneratorContext --------------------------------------
@@ -117,37 +118,50 @@ class MockGeneratorContext : public GeneratorContext {
   std::map<string, string*> files_;
 };
 
-TEST(BootstrapTest, GeneratedDescriptorMatches) {
-  MockErrorCollector error_collector;
+const char kDescriptorParameter[] = "dllexport_decl=LIBPROTOBUF_EXPORT";
+const char kPluginParameter[] = "dllexport_decl=LIBPROTOC_EXPORT";
+const char kNormalParameter[] = "";
+
+const char* test_protos[][2] = {
+    {"google/protobuf/descriptor", kDescriptorParameter},
+    {"google/protobuf/compiler/plugin", kPluginParameter},
+};
+
+TEST(BootstrapTest, GeneratedFilesMatch) {
+  // We need a mapping from the actual file to virtual and actual path
+  // of the data to compare to.
+  std::map<string, string> vpath_map;
+  std::map<string, string> rpath_map;
+  rpath_map["third_party/protobuf/src/google/protobuf/test_messages_proto2"] =
+      "net/proto2/z_generated_example/test_messages_proto2";
+  rpath_map["third_party/protobuf/src/google/protobuf/test_messages_proto3"] =
+      "net/proto2/z_generated_example/test_messages_proto3";
+  rpath_map["google/protobuf/proto2_weak"] =
+      "net/proto2/z_generated_example/proto2_weak";
+
   DiskSourceTree source_tree;
   source_tree.MapPath("", TestSourceDir());
-  Importer importer(&source_tree, &error_collector);
-  const FileDescriptor* proto_file =
-    importer.Import("google/protobuf/descriptor.proto");
-  const FileDescriptor* plugin_proto_file =
-    importer.Import("google/protobuf/compiler/plugin.proto");
-  EXPECT_EQ("", error_collector.text_);
-  ASSERT_TRUE(proto_file != NULL);
-  ASSERT_TRUE(plugin_proto_file != NULL);
-
-  CppGenerator generator;
-  MockGeneratorContext context;
-  string error;
-  string parameter = "dllexport_decl=LIBPROTOBUF_EXPORT";
-  ASSERT_TRUE(generator.Generate(proto_file, parameter,
-                                 &context, &error));
-  parameter = "dllexport_decl=LIBPROTOC_EXPORT";
-  ASSERT_TRUE(generator.Generate(plugin_proto_file, parameter,
-                                 &context, &error));
-
-  context.ExpectFileMatches("google/protobuf/descriptor.pb.h",
-                            "google/protobuf/descriptor.pb.h");
-  context.ExpectFileMatches("google/protobuf/descriptor.pb.cc",
-                            "google/protobuf/descriptor.pb.cc");
-  context.ExpectFileMatches("google/protobuf/compiler/plugin.pb.h",
-                            "google/protobuf/compiler/plugin.pb.h");
-  context.ExpectFileMatches("google/protobuf/compiler/plugin.pb.cc",
-                            "google/protobuf/compiler/plugin.pb.cc");
+
+  for (auto file_parameter : test_protos) {
+    MockErrorCollector error_collector;
+    Importer importer(&source_tree, &error_collector);
+    const FileDescriptor* file =
+        importer.Import(file_parameter[0] + string(".proto"));
+    ASSERT_TRUE(file != nullptr)
+        << "Can't import file " << file_parameter[0] + string(".proto") << "\n";
+    EXPECT_EQ("", error_collector.text_);
+    CppGenerator generator;
+    MockGeneratorContext context;
+    string error;
+    ASSERT_TRUE(generator.Generate(file, file_parameter[1], &context, &error));
+
+    string vpath =
+        FindWithDefault(vpath_map, file_parameter[0], file_parameter[0]);
+    string rpath =
+        FindWithDefault(rpath_map, file_parameter[0], file_parameter[0]);
+    context.ExpectFileMatches(vpath + ".pb.cc", rpath + ".pb.cc");
+    context.ExpectFileMatches(vpath + ".pb.h", rpath + ".pb.h");
+  }
 }
 
 }  // namespace
diff --git a/src/google/protobuf/compiler/cpp/cpp_enum.cc b/src/google/protobuf/compiler/cpp/cpp_enum.cc
index 6a8a83d1..0d6a9e24 100644
--- a/src/google/protobuf/compiler/cpp/cpp_enum.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_enum.cc
@@ -81,10 +81,16 @@ void EnumGenerator::GenerateDefinition(io::Printer* printer) {
   std::map<string, string> vars;
   vars["classname"] = classname_;
   vars["short_name"] = descriptor_->name();
-  vars["enumbase"] = classname_ + (options_.proto_h ? " : int" : "");
-
-  printer->Print(vars, "enum $enumbase$ {\n");
-  printer->Annotate("enumbase", descriptor_);
+  vars["enumbase"] = options_.proto_h ? " : int" : "";
+  // These variables are placeholders to pick out the beginning and ends of
+  // identifiers for annotations (when doing so with existing variables would
+  // be ambiguous or impossible). They should never be set to anything but the
+  // empty string.
+  vars["{"] = "";
+  vars["}"] = "";
+
+  printer->Print(vars, "enum $classname$$enumbase$ {\n");
+  printer->Annotate("classname", descriptor_);
   printer->Indent();
 
   const EnumValueDescriptor* min_value = descriptor_->value(0);
@@ -102,7 +108,8 @@ void EnumGenerator::GenerateDefinition(io::Printer* printer) {
         " PROTOBUF_DEPRECATED" : "";
 
     if (i > 0) printer->Print(",\n");
-    printer->Print(vars, "$prefix$$name$$deprecation$ = $number$");
+    printer->Print(vars, "${$$prefix$$name$$}$$deprecation$ = $number$");
+    printer->Annotate("{", "}", descriptor_->value(i));
 
     if (descriptor_->value(i)->number() < min_value->number()) {
       min_value = descriptor_->value(i);
@@ -134,14 +141,20 @@ void EnumGenerator::GenerateDefinition(io::Printer* printer) {
   }
 
   printer->Print(vars,
-    "$dllexport$bool $classname$_IsValid(int value);\n"
-    "const $classname$ $prefix$$short_name$_MIN = $prefix$$min_name$;\n"
-    "const $classname$ $prefix$$short_name$_MAX = $prefix$$max_name$;\n");
+                 "$dllexport$bool $classname$_IsValid(int value);\n"
+                 "const $classname$ ${$$prefix$$short_name$_MIN$}$ = "
+                 "$prefix$$min_name$;\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(vars,
+                 "const $classname$ ${$$prefix$$short_name$_MAX$}$ = "
+                 "$prefix$$max_name$;\n");
+  printer->Annotate("{", "}", descriptor_);
 
   if (generate_array_size_) {
     printer->Print(vars,
-      "const int $prefix$$short_name$_ARRAYSIZE = "
-      "$prefix$$short_name$_MAX + 1;\n\n");
+                   "const int ${$$prefix$$short_name$_ARRAYSIZE$}$ = "
+                   "$prefix$$short_name$_MAX + 1;\n\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   if (HasDescriptorMethods(descriptor_->file(), options_)) {
@@ -166,7 +179,7 @@ void EnumGenerator::GenerateDefinition(io::Printer* printer) {
 void EnumGenerator::
 GenerateGetEnumDescriptorSpecializations(io::Printer* printer) {
   printer->Print(
-      "template <> struct is_proto_enum< $classname$> : ::google::protobuf::internal::true_type "
+      "template <> struct is_proto_enum< $classname$> : ::std::true_type "
       "{};\n",
       "classname", ClassName(descriptor_, true));
   if (HasDescriptorMethods(descriptor_->file(), options_)) {
@@ -184,6 +197,8 @@ void EnumGenerator::GenerateSymbolImports(io::Printer* printer) {
   vars["nested_name"] = descriptor_->name();
   vars["classname"] = classname_;
   vars["constexpr"] = options_.proto_h ? "constexpr " : "";
+  vars["{"] = "";
+  vars["}"] = "";
   printer->Print(vars, "typedef $classname$ $nested_name$;\n");
 
   for (int j = 0; j < descriptor_->value_count(); j++) {
@@ -191,22 +206,27 @@ void EnumGenerator::GenerateSymbolImports(io::Printer* printer) {
     vars["deprecated_attr"] = descriptor_->value(j)->options().deprecated() ?
       "GOOGLE_PROTOBUF_DEPRECATED_ATTR " : "";
     printer->Print(vars,
-      "$deprecated_attr$static $constexpr$const $nested_name$ $tag$ =\n"
+      "$deprecated_attr$static $constexpr$const $nested_name$ ${$$tag$$}$ =\n"
       "  $classname$_$tag$;\n");
+    printer->Annotate("{", "}", descriptor_->value(j));
   }
 
   printer->Print(vars,
     "static inline bool $nested_name$_IsValid(int value) {\n"
     "  return $classname$_IsValid(value);\n"
     "}\n"
-    "static const $nested_name$ $nested_name$_MIN =\n"
-    "  $classname$_$nested_name$_MIN;\n"
-    "static const $nested_name$ $nested_name$_MAX =\n"
+    "static const $nested_name$ ${$$nested_name$_MIN$}$ =\n"
+    "  $classname$_$nested_name$_MIN;\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(vars,
+    "static const $nested_name$ ${$$nested_name$_MAX$}$ =\n"
     "  $classname$_$nested_name$_MAX;\n");
+  printer->Annotate("{", "}", descriptor_);
   if (generate_array_size_) {
     printer->Print(vars,
-      "static const int $nested_name$_ARRAYSIZE =\n"
+      "static const int ${$$nested_name$_ARRAYSIZE$}$ =\n"
       "  $classname$_$nested_name$_ARRAYSIZE;\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   if (HasDescriptorMethods(descriptor_->file(), options_)) {
@@ -229,27 +249,10 @@ void EnumGenerator::GenerateSymbolImports(io::Printer* printer) {
   }
 }
 
-void EnumGenerator::GenerateDescriptorInitializer(io::Printer* printer) {
-  std::map<string, string> vars;
-  vars["index"] = SimpleItoa(descriptor_->index());
-  vars["index_in_metadata"] = SimpleItoa(index_in_metadata_);
-
-  if (descriptor_->containing_type() == NULL) {
-    printer->Print(vars,
-                   "file_level_enum_descriptors[$index_in_metadata$] = "
-                   "file->enum_type($index$);\n");
-  } else {
-    vars["parent"] = ClassName(descriptor_->containing_type(), false);
-    printer->Print(vars,
-                   "file_level_enum_descriptors[$index_in_metadata$] = "
-                   "$parent$_descriptor->enum_type($index$);\n");
-  }
-}
-
-void EnumGenerator::GenerateMethods(io::Printer* printer) {
+void EnumGenerator::GenerateMethods(int idx, io::Printer* printer) {
   std::map<string, string> vars;
   vars["classname"] = classname_;
-  vars["index_in_metadata"] = SimpleItoa(index_in_metadata_);
+  vars["index_in_metadata"] = SimpleItoa(idx);
   vars["constexpr"] = options_.proto_h ? "constexpr " : "";
   vars["file_namespace"] = FileLevelNamespace(descriptor_->file()->name());
 
diff --git a/src/google/protobuf/compiler/cpp/cpp_enum.h b/src/google/protobuf/compiler/cpp/cpp_enum.h
index 0b568c57..0d2488a9 100644
--- a/src/google/protobuf/compiler/cpp/cpp_enum.h
+++ b/src/google/protobuf/compiler/cpp/cpp_enum.h
@@ -86,13 +86,10 @@ class EnumGenerator {
 
   // Source file stuff.
 
-  // Generate code that initializes the global variable storing the enum's
-  // descriptor.
-  void GenerateDescriptorInitializer(io::Printer* printer);
-
   // Generate non-inline methods related to the enum, such as IsValidValue().
-  // Goes in the .cc file.
-  void GenerateMethods(io::Printer* printer);
+  // Goes in the .cc file. EnumDescriptors are stored in an array, idx is
+  // the index in this array that corresponds with this enum.
+  void GenerateMethods(int idx, io::Printer* printer);
 
  private:
   const EnumDescriptor* descriptor_;
@@ -101,8 +98,6 @@ class EnumGenerator {
   // whether to generate the *_ARRAYSIZE constant.
   const bool generate_array_size_;
 
-  int index_in_metadata_;
-
   friend class FileGenerator;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumGenerator);
 };
diff --git a/src/google/protobuf/compiler/cpp/cpp_enum_field.cc b/src/google/protobuf/compiler/cpp/cpp_enum_field.cc
index e4b17a98..50c7b5f3 100644
--- a/src/google/protobuf/compiler/cpp/cpp_enum_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_enum_field.cc
@@ -74,27 +74,26 @@ GeneratePrivateMembers(io::Printer* printer) const {
 
 void EnumFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
+  printer->Print(variables_, "$deprecated_attr$$type$ $name$() const;\n");
+  printer->Annotate("name", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$$type$ $name$() const;\n"
-    "$deprecated_attr$void set_$name$($type$ value);\n");
+                 "$deprecated_attr$void ${$set_$name$$}$($type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void EnumFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$() const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  return static_cast< $type$ >($name$_);\n"
     "}\n"
-    "$inline$void $classname$::set_$name$($type$ value) {\n");
+    "inline void $classname$::set_$name$($type$ value) {\n");
   if (!HasPreservingUnknownEnumSemantics(descriptor_->file())) {
-    printer->Print(variables,
+    printer->Print(variables_,
     "  assert($type$_IsValid(value));\n");
   }
-  printer->Print(variables,
+  printer->Print(variables_,
     "  $set_hasbit$\n"
     "  $name$_ = value;\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
@@ -113,7 +112,7 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void EnumFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "std::swap($name$_, other->$name$_);\n");
+  printer->Print(variables_, "swap($name$_, other->$name$_);\n");
 }
 
 void EnumFieldGenerator::
@@ -143,12 +142,14 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     if (UseUnknownFieldSet(descriptor_->file(), options_)) {
       printer->Print(variables_,
         "} else {\n"
-        "  mutable_unknown_fields()->AddVarint($number$, value);\n");
+        "  mutable_unknown_fields()->AddVarint(\n"
+        "      $number$, static_cast< ::google::protobuf::uint64>(value));\n");
     } else {
       printer->Print(
         "} else {\n"
         "  unknown_fields_stream.WriteVarint32($tag$u);\n"
-        "  unknown_fields_stream.WriteVarint32(value);\n",
+        "  unknown_fields_stream.WriteVarint32(\n"
+        "      static_cast< ::google::protobuf::uint32>(value));\n",
         "tag", SimpleItoa(internal::WireFormat::MakeTag(descriptor_)));
     }
     printer->Print(variables_,
@@ -189,36 +190,33 @@ EnumOneofFieldGenerator(const FieldDescriptor* descriptor,
 EnumOneofFieldGenerator::~EnumOneofFieldGenerator() {}
 
 void EnumOneofFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$() const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  if (has_$name$()) {\n"
-    "    return static_cast< $type$ >($oneof_prefix$$name$_);\n"
+    "    return static_cast< $type$ >($field_member$);\n"
     "  }\n"
     "  return static_cast< $type$ >($default$);\n"
     "}\n"
-    "$inline$void $classname$::set_$name$($type$ value) {\n");
+    "inline void $classname$::set_$name$($type$ value) {\n");
   if (!HasPreservingUnknownEnumSemantics(descriptor_->file())) {
-    printer->Print(variables,
+    printer->Print(variables_,
     "  assert($type$_IsValid(value));\n");
   }
-  printer->Print(variables,
+  printer->Print(variables_,
     "  if (!has_$name$()) {\n"
     "    clear_$oneof_name$();\n"
     "    set_has_$name$();\n"
     "  }\n"
-    "  $oneof_prefix$$name$_ = value;\n"
+    "  $field_member$ = value;\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "}\n");
 }
 
 void EnumOneofFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$oneof_prefix$$name$_ = $default$;\n");
+  printer->Print(variables_, "$field_member$ = $default$;\n");
 }
 
 void EnumOneofFieldGenerator::
@@ -228,9 +226,8 @@ GenerateSwappingCode(io::Printer* printer) const {
 
 void EnumOneofFieldGenerator::
 GenerateConstructorCode(io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "_$classname$_default_instance_.$name$_ = $default$;\n");
+  printer->Print(variables_,
+                 "$ns$::_$classname$_default_instance_.$name$_ = $default$;\n");
 }
 
 // ===================================================================
@@ -257,49 +254,56 @@ GeneratePrivateMembers(io::Printer* printer) const {
 void RepeatedEnumFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
   printer->Print(variables_,
-    "$deprecated_attr$$type$ $name$(int index) const;\n"
-    "$deprecated_attr$void set_$name$(int index, $type$ value);\n"
-    "$deprecated_attr$void add_$name$($type$ value);\n");
+                 "$deprecated_attr$$type$ $name$(int index) const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$set_$name$$}$(int index, $type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$const ::google::protobuf::RepeatedField<int>& $name$() const;\n"
-    "$deprecated_attr$::google::protobuf::RepeatedField<int>* mutable_$name$();\n");
+                 "$deprecated_attr$void ${$add_$name$$}$($type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$const ::google::protobuf::RepeatedField<int>& $name$() const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$::google::protobuf::RepeatedField<int>* "
+                 "${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedEnumFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$(int index) const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$(int index) const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  return static_cast< $type$ >($name$_.Get(index));\n"
     "}\n"
-    "$inline$void $classname$::set_$name$(int index, $type$ value) {\n");
+    "inline void $classname$::set_$name$(int index, $type$ value) {\n");
   if (!HasPreservingUnknownEnumSemantics(descriptor_->file())) {
-    printer->Print(variables,
+    printer->Print(variables_,
     "  assert($type$_IsValid(value));\n");
   }
-  printer->Print(variables,
+  printer->Print(variables_,
     "  $name$_.Set(index, value);\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "}\n"
-    "$inline$void $classname$::add_$name$($type$ value) {\n");
+    "inline void $classname$::add_$name$($type$ value) {\n");
   if (!HasPreservingUnknownEnumSemantics(descriptor_->file())) {
-    printer->Print(variables,
+    printer->Print(variables_,
     "  assert($type$_IsValid(value));\n");
   }
-  printer->Print(variables,
+  printer->Print(variables_,
     "  $name$_.Add(value);\n"
     "  // @@protoc_insertion_point(field_add:$full_name$)\n"
-    "}\n");
-  printer->Print(variables,
-    "$inline$const ::google::protobuf::RepeatedField<int>&\n"
+    "}\n"
+    "inline const ::google::protobuf::RepeatedField<int>&\n"
     "$classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_list:$full_name$)\n"
     "  return $name$_;\n"
     "}\n"
-    "$inline$::google::protobuf::RepeatedField<int>*\n"
+    "inline ::google::protobuf::RepeatedField<int>*\n"
     "$classname$::mutable_$name$() {\n"
     "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
     "  return &$name$_;\n"
@@ -318,7 +322,7 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void RepeatedEnumFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.UnsafeArenaSwap(&other->$name$_);\n");
+  printer->Print(variables_, "$name$_.InternalSwap(&other->$name$_);\n");
 }
 
 void RepeatedEnumFieldGenerator::
@@ -344,12 +348,14 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     if (UseUnknownFieldSet(descriptor_->file(), options_)) {
       printer->Print(variables_,
         "} else {\n"
-        "  mutable_unknown_fields()->AddVarint($number$, value);\n");
+        "  mutable_unknown_fields()->AddVarint(\n"
+        "      $number$, static_cast< ::google::protobuf::uint64>(value));\n");
     } else {
       printer->Print(
         "} else {\n"
         "  unknown_fields_stream.WriteVarint32(tag);\n"
-        "  unknown_fields_stream.WriteVarint32(value);\n");
+        "  unknown_fields_stream.WriteVarint32(\n"
+        "      static_cast< ::google::protobuf::uint32>(value));\n");
     }
     printer->Print("}\n");
   }
@@ -391,7 +397,7 @@ GenerateMergeFromCodedStreamWithPacking(io::Printer* printer) const {
       "::google::protobuf::uint32 length;\n"
       "DO_(input->ReadVarint32(&length));\n"
       "::google::protobuf::io::CodedInputStream::Limit limit = "
-          "input->PushLimit(length);\n"
+          "input->PushLimit(static_cast<int>(length));\n"
       "while (input->BytesUntilLimit() > 0) {\n"
       "  int value;\n"
       "  DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<\n"
@@ -407,11 +413,13 @@ GenerateMergeFromCodedStreamWithPacking(io::Printer* printer) const {
       "  } else {\n");
       if (UseUnknownFieldSet(descriptor_->file(), options_)) {
         printer->Print(variables_,
-        "    mutable_unknown_fields()->AddVarint($number$, value);\n");
+        "  mutable_unknown_fields()->AddVarint(\n"
+        "      $number$, static_cast< ::google::protobuf::uint64>(value));\n");
       } else {
         printer->Print(variables_,
         "    unknown_fields_stream.WriteVarint32(tag);\n"
-        "    unknown_fields_stream.WriteVarint32(value);\n");
+        "    unknown_fields_stream.WriteVarint32(\n"
+        "        static_cast< ::google::protobuf::uint32>(value));\n");
       }
       printer->Print(
       "  }\n");
@@ -432,7 +440,8 @@ GenerateSerializeWithCachedSizes(io::Printer* printer) const {
       "    $number$,\n"
       "    ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,\n"
       "    output);\n"
-      "  output->WriteVarint32(_$name$_cached_byte_size_);\n"
+      "  output->WriteVarint32(\n"
+      "      static_cast< ::google::protobuf::uint32>(_$name$_cached_byte_size_));\n"
       "}\n");
   }
   printer->Print(variables_,
@@ -460,21 +469,16 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
       "    ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,\n"
       "    target);\n"
       "  target = ::google::protobuf::io::CodedOutputStream::WriteVarint32ToArray("
-      "    _$name$_cached_byte_size_, target);\n"
-      "}\n");
-  }
-  printer->Print(variables_,
-      "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
-  if (descriptor_->is_packed()) {
-    printer->Print(variables_,
+      "      static_cast< ::google::protobuf::uint32>(\n"
+      "          _$name$_cached_byte_size_), target);\n"
       "  target = ::google::protobuf::internal::WireFormatLite::WriteEnumNoTagToArray(\n"
-      "    this->$name$(i), target);\n");
+      "    this->$name$_, target);\n"
+      "}\n");
   } else {
     printer->Print(variables_,
-      "  target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(\n"
-      "    $number$, this->$name$(i), target);\n");
+      "target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(\n"
+      "  $number$, this->$name$_, target);\n");
   }
-  printer->Print("}\n");
 }
 
 void RepeatedEnumFieldGenerator::
@@ -482,19 +486,20 @@ GenerateByteSize(io::Printer* printer) const {
   printer->Print(variables_,
     "{\n"
     "  size_t data_size = 0;\n"
-    "  unsigned int count = this->$name$_size();");
+    "  unsigned int count = static_cast<unsigned int>(this->$name$_size());");
   printer->Indent();
   printer->Print(variables_,
       "for (unsigned int i = 0; i < count; i++) {\n"
       "  data_size += ::google::protobuf::internal::WireFormatLite::EnumSize(\n"
-      "    this->$name$(i));\n"
+      "    this->$name$(static_cast<int>(i)));\n"
       "}\n");
 
   if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "if (data_size > 0) {\n"
       "  total_size += $tag_size$ +\n"
-      "    ::google::protobuf::internal::WireFormatLite::Int32Size(data_size);\n"
+      "    ::google::protobuf::internal::WireFormatLite::Int32Size(\n"
+      "        static_cast< ::google::protobuf::int32>(data_size));\n"
       "}\n"
       "int cached_size = ::google::protobuf::internal::ToCachedSize(data_size);\n"
       "GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();\n"
diff --git a/src/google/protobuf/compiler/cpp/cpp_enum_field.h b/src/google/protobuf/compiler/cpp/cpp_enum_field.h
index 3ecd7ba8..d0e87b79 100644
--- a/src/google/protobuf/compiler/cpp/cpp_enum_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_enum_field.h
@@ -52,8 +52,7 @@ class EnumFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
@@ -79,8 +78,7 @@ class EnumOneofFieldGenerator : public EnumFieldGenerator {
   ~EnumOneofFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
   void GenerateConstructorCode(io::Printer* printer) const;
@@ -98,8 +96,7 @@ class RepeatedEnumFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
diff --git a/src/google/protobuf/compiler/cpp/cpp_extension.cc b/src/google/protobuf/compiler/cpp/cpp_extension.cc
index e4fce461..c416ba10 100644
--- a/src/google/protobuf/compiler/cpp/cpp_extension.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_extension.cc
@@ -35,9 +35,10 @@
 #include <google/protobuf/compiler/cpp/cpp_extension.h>
 #include <map>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/stubs/strutil.h>
+
 
 namespace google {
 namespace protobuf {
@@ -119,7 +120,6 @@ void ExtensionGenerator::GenerateDeclaration(io::Printer* printer) {
     "    ::google::protobuf::internal::$type_traits$, $field_type$, $packed$ >\n"
     "  $name$;\n"
     );
-
 }
 
 void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
@@ -166,46 +166,6 @@ void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
     "  $name$($constant_name$, $default$);\n");
 }
 
-void ExtensionGenerator::GenerateRegistration(io::Printer* printer) {
-  std::map<string, string> vars;
-  vars["extendee"   ] = ExtendeeClassName(descriptor_);
-  vars["number"     ] = SimpleItoa(descriptor_->number());
-  vars["field_type" ] = SimpleItoa(static_cast<int>(descriptor_->type()));
-  vars["is_repeated"] = descriptor_->is_repeated() ? "true" : "false";
-  vars["is_packed"  ] = (descriptor_->is_repeated() &&
-                         descriptor_->options().packed())
-                        ? "true" : "false";
-
-  switch (descriptor_->cpp_type()) {
-    case FieldDescriptor::CPPTYPE_ENUM:
-      printer->Print(
-          vars,
-          "::google::protobuf::internal::ExtensionSet::RegisterEnumExtension(\n"
-          "  $extendee$::internal_default_instance(),\n"
-          "  $number$, $field_type$, $is_repeated$, $is_packed$,\n");
-      printer->Print(
-        "  &$type$_IsValid);\n",
-        "type", ClassName(descriptor_->enum_type(), true));
-      break;
-    case FieldDescriptor::CPPTYPE_MESSAGE:
-      printer->Print(
-          vars,
-          "::google::protobuf::internal::ExtensionSet::RegisterMessageExtension(\n"
-          "  $extendee$::internal_default_instance(),\n"
-          "  $number$, $field_type$, $is_repeated$, $is_packed$,\n");
-      printer->Print("  $type$::internal_default_instance());\n", "type",
-                     ClassName(descriptor_->message_type(), true));
-      break;
-    default:
-      printer->Print(
-          vars,
-          "::google::protobuf::internal::ExtensionSet::RegisterExtension(\n"
-          "  $extendee$::internal_default_instance(),\n"
-          "  $number$, $field_type$, $is_repeated$, $is_packed$);\n");
-      break;
-  }
-}
-
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_extension.h b/src/google/protobuf/compiler/cpp/cpp_extension.h
index 1c1caf1f..30236d71 100644
--- a/src/google/protobuf/compiler/cpp/cpp_extension.h
+++ b/src/google/protobuf/compiler/cpp/cpp_extension.h
@@ -67,9 +67,6 @@ class ExtensionGenerator {
   // Source file stuff.
   void GenerateDefinition(io::Printer* printer);
 
-  // Generate code to register the extension.
-  void GenerateRegistration(io::Printer* printer);
-
  private:
   const FieldDescriptor* descriptor_;
   string type_traits_;
diff --git a/src/google/protobuf/compiler/cpp/cpp_field.cc b/src/google/protobuf/compiler/cpp/cpp_field.cc
index 4480a9d2..0de20f84 100644
--- a/src/google/protobuf/compiler/cpp/cpp_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_field.cc
@@ -34,21 +34,18 @@
 
 #include <google/protobuf/compiler/cpp/cpp_field.h>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_primitive_field.h>
 #include <google/protobuf/compiler/cpp/cpp_string_field.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
 #include <google/protobuf/compiler/cpp/cpp_enum_field.h>
 #include <google/protobuf/compiler/cpp/cpp_map_field.h>
 #include <google/protobuf/compiler/cpp/cpp_message_field.h>
 #include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/wire_format.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/wire_format.h>
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -61,17 +58,13 @@ using internal::WireFormat;
 void SetCommonFieldVariables(const FieldDescriptor* descriptor,
                              std::map<string, string>* variables,
                              const Options& options) {
+  (*variables)["ns"] = Namespace(descriptor);
   (*variables)["name"] = FieldName(descriptor);
   (*variables)["index"] = SimpleItoa(descriptor->index());
   (*variables)["number"] = SimpleItoa(descriptor->number());
   (*variables)["classname"] = ClassName(FieldScope(descriptor), false);
   (*variables)["declared_type"] = DeclaredTypeMethodName(descriptor->type());
-
-  // non_null_ptr_to_name is usable only if has_$name$ is true.  It yields a
-  // pointer that will not be NULL.  Subclasses of FieldGenerator may set
-  // (*variables)["non_null_ptr_to_name"] differently.
-  (*variables)["non_null_ptr_to_name"] =
-      StrCat("&this->", FieldName(descriptor), "()");
+  (*variables)["field_member"] = FieldName(descriptor) + "_";
 
   (*variables)["tag_size"] = SimpleItoa(
     WireFormat::TagSize(descriptor->number(), descriptor->type()));
@@ -80,8 +73,6 @@ void SetCommonFieldVariables(const FieldDescriptor* descriptor,
   (*variables)["deprecated_attr"] = descriptor->options().deprecated()
       ? "GOOGLE_PROTOBUF_DEPRECATED_ATTR " : "";
 
-  (*variables)["cppget"] = "Get";
-
   if (HasFieldPresence(descriptor->file())) {
     (*variables)["set_hasbit"] =
         "set_has_" + FieldName(descriptor) + "();";
@@ -92,18 +83,19 @@ void SetCommonFieldVariables(const FieldDescriptor* descriptor,
     (*variables)["clear_hasbit"] = "";
   }
 
-  // By default, empty string, so that generic code used for both oneofs and
-  // singular fields can be written.
-  (*variables)["oneof_prefix"] = "";
+  // These variables are placeholders to pick out the beginning and ends of
+  // identifiers for annotations (when doing so with existing variables would
+  // be ambiguous or impossible). They should never be set to anything but the
+  // empty string.
+  (*variables)["{"] = "";
+  (*variables)["}"] = "";
 }
 
 void SetCommonOneofFieldVariables(const FieldDescriptor* descriptor,
                                   std::map<string, string>* variables) {
   const string prefix = descriptor->containing_oneof()->name() + "_.";
-  (*variables)["oneof_prefix"] = prefix;
   (*variables)["oneof_name"] = descriptor->containing_oneof()->name();
-  (*variables)["non_null_ptr_to_name"] =
-      StrCat(prefix, (*variables)["name"], "_");
+  (*variables)["field_member"] = StrCat(prefix, (*variables)["name"], "_");
 }
 
 FieldGenerator::~FieldGenerator() {}
@@ -121,26 +113,29 @@ GenerateMergeFromCodedStreamWithPacking(io::Printer* printer) const {
 }
 
 FieldGeneratorMap::FieldGeneratorMap(const Descriptor* descriptor,
-                                     const Options& options)
+                                     const Options& options,
+                                     SCCAnalyzer* scc_analyzer)
     : descriptor_(descriptor),
       options_(options),
-      field_generators_(
-          new google::protobuf::scoped_ptr<FieldGenerator>[descriptor->field_count()]) {
+      field_generators_(descriptor->field_count()) {
   // Construct all the FieldGenerators.
   for (int i = 0; i < descriptor->field_count(); i++) {
-    field_generators_[i].reset(MakeGenerator(descriptor->field(i), options));
+    field_generators_[i].reset(
+        MakeGenerator(descriptor->field(i), options, scc_analyzer));
   }
 }
 
 FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
-                                                 const Options& options) {
+                                                 const Options& options,
+                                                 SCCAnalyzer* scc_analyzer) {
   if (field->is_repeated()) {
     switch (field->cpp_type()) {
       case FieldDescriptor::CPPTYPE_MESSAGE:
         if (field->is_map()) {
           return new MapFieldGenerator(field, options);
         } else {
-          return new RepeatedMessageFieldGenerator(field, options);
+          return new RepeatedMessageFieldGenerator(field, options,
+                                                   scc_analyzer);
         }
       case FieldDescriptor::CPPTYPE_STRING:
         switch (field->options().ctype()) {
@@ -156,7 +151,7 @@ FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
   } else if (field->containing_oneof()) {
     switch (field->cpp_type()) {
       case FieldDescriptor::CPPTYPE_MESSAGE:
-        return new MessageOneofFieldGenerator(field, options);
+        return new MessageOneofFieldGenerator(field, options, scc_analyzer);
       case FieldDescriptor::CPPTYPE_STRING:
         switch (field->options().ctype()) {
           default:  // StringOneofFieldGenerator handles unknown ctypes.
@@ -171,7 +166,7 @@ FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
   } else {
     switch (field->cpp_type()) {
       case FieldDescriptor::CPPTYPE_MESSAGE:
-        return new MessageFieldGenerator(field, options);
+        return new MessageFieldGenerator(field, options, scc_analyzer);
       case FieldDescriptor::CPPTYPE_STRING:
         switch (field->options().ctype()) {
           default:  // StringFieldGenerator handles unknown ctypes.
@@ -194,7 +189,6 @@ const FieldGenerator& FieldGeneratorMap::get(
   return *field_generators_[field->index()];
 }
 
-
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_field.h b/src/google/protobuf/compiler/cpp/cpp_field.h
index 00dc25d4..8cdbe886 100644
--- a/src/google/protobuf/compiler/cpp/cpp_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_field.h
@@ -37,13 +37,11 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 
-#include <google/protobuf/descriptor.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_options.h>
+#include <google/protobuf/descriptor.h>
 
 namespace google {
 namespace protobuf {
@@ -82,46 +80,20 @@ class FieldGenerator {
   // implementation is empty.
   virtual void GenerateStaticMembers(io::Printer* /*printer*/) const {}
 
-  // Generate prototypes for accessors that will manipulate imported
-  // messages inline.  These are for .proto.h headers.
-  //
-  // In .proto.h mode, the headers of imports are not #included. However,
-  // functions that manipulate the imported message types need access to
-  // the class definition of the imported message, meaning that the headers
-  // must be #included. To get around this, functions that manipulate
-  // imported message objects are defined as dependent functions in a base
-  // template class. By making them dependent template functions, the
-  // function templates will not be instantiated until they are called, so
-  // we can defer to those translation units to #include the necessary
-  // generated headers.
-  //
-  // See:
-  // http://en.cppreference.com/w/cpp/language/class_template#Implicit_instantiation
-  //
-  // Most field types don't need this, so the default implementation is empty.
-  virtual void GenerateDependentAccessorDeclarations(
-      io::Printer* printer) const {}
-
   // Generate prototypes for all of the accessor functions related to this
   // field.  These are placed inside the class definition.
   virtual void GenerateAccessorDeclarations(io::Printer* printer) const = 0;
 
-  // Generate inline definitions of depenent accessor functions for this field.
-  // These are placed inside the header after all class definitions.
-  virtual void GenerateDependentInlineAccessorDefinitions(
-    io::Printer* printer) const {}
-
   // Generate inline definitions of accessor functions for this field.
   // These are placed inside the header after all class definitions.
-  // In non-.proto.h mode, this generates dependent accessor functions as well.
   virtual void GenerateInlineAccessorDefinitions(
-    io::Printer* printer, bool is_inline) const = 0;
+      io::Printer* printer) const = 0;
 
   // Generate definitions of accessors that aren't inlined.  These are
   // placed somewhere in the .cc file.
   // Most field types don't need this, so the default implementation is empty.
   virtual void GenerateNonInlineAccessorDefinitions(
-    io::Printer* /*printer*/) const {}
+      io::Printer* /*printer*/) const {}
 
   // Generate lines of code (statements, not declarations) which clear the
   // field.  This is used to define the clear_$name$() method
@@ -180,14 +152,14 @@ class FieldGenerator {
   virtual void GenerateDefaultInstanceAllocator(io::Printer* /*printer*/)
       const {}
 
-  // Generate code that should be run when ShutdownProtobufLibrary() is called,
-  // to delete all dynamically-allocated objects.
-  virtual void GenerateShutdownCode(io::Printer* /*printer*/) const {}
-
   // Generate lines to decode this field, which will be placed inside the
   // message's MergeFromCodedStream() method.
   virtual void GenerateMergeFromCodedStream(io::Printer* printer) const = 0;
 
+  // Returns true if this field's "MergeFromCodedStream" code needs the arena
+  // to be defined as a variable.
+  virtual bool MergeFromCodedStreamNeedsArena() const { return false; }
+
   // Generate lines to decode this field from a packed value, which will be
   // placed inside the message's MergeFromCodedStream() method.
   virtual void GenerateMergeFromCodedStreamWithPacking(io::Printer* printer)
@@ -207,6 +179,11 @@ class FieldGenerator {
   // are placed in the message's ByteSize() method.
   virtual void GenerateByteSize(io::Printer* printer) const = 0;
 
+  // Any tags about field layout decisions (such as inlining) to embed in the
+  // offset.
+  virtual uint32 CalculateFieldTag() const { return 0; }
+  virtual bool IsInlined() const { return false; }
+
  protected:
   const Options& options_;
 
@@ -217,7 +194,8 @@ class FieldGenerator {
 // Convenience class which constructs FieldGenerators for a Descriptor.
 class FieldGeneratorMap {
  public:
-  FieldGeneratorMap(const Descriptor* descriptor, const Options& options);
+  FieldGeneratorMap(const Descriptor* descriptor, const Options& options,
+                    SCCAnalyzer* scc_analyzer);
   ~FieldGeneratorMap();
 
   const FieldGenerator& get(const FieldDescriptor* field) const;
@@ -225,15 +203,15 @@ class FieldGeneratorMap {
  private:
   const Descriptor* descriptor_;
   const Options& options_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<FieldGenerator> > field_generators_;
+  std::vector<std::unique_ptr<FieldGenerator>> field_generators_;
 
   static FieldGenerator* MakeGenerator(const FieldDescriptor* field,
-                                       const Options& options);
+                                       const Options& options,
+                                       SCCAnalyzer* scc_analyzer);
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
 };
 
-
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_file.cc b/src/google/protobuf/compiler/cpp/cpp_file.cc
index 0e5e2f18..42525687 100644
--- a/src/google/protobuf/compiler/cpp/cpp_file.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_file.cc
@@ -35,19 +35,17 @@
 #include <google/protobuf/compiler/cpp/cpp_file.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
+#include <vector>
 
 #include <google/protobuf/compiler/cpp/cpp_enum.h>
-#include <google/protobuf/compiler/cpp/cpp_service.h>
 #include <google/protobuf/compiler/cpp/cpp_extension.h>
+#include <google/protobuf/compiler/cpp/cpp_field.h>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_message.h>
-#include <google/protobuf/compiler/cpp/cpp_field.h>
-#include <google/protobuf/io/printer.h>
+#include <google/protobuf/compiler/cpp/cpp_service.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -55,29 +53,23 @@ namespace protobuf {
 namespace compiler {
 namespace cpp {
 
-// ===================================================================
-
 FileGenerator::FileGenerator(const FileDescriptor* file, const Options& options)
     : file_(file),
       options_(options),
-      message_generators_owner_(
-          new google::protobuf::scoped_ptr<MessageGenerator>[ file->message_type_count() ]),
+      scc_analyzer_(options),
       enum_generators_owner_(
-          new google::protobuf::scoped_ptr<EnumGenerator>[ file->enum_type_count() ]),
+          new std::unique_ptr<EnumGenerator>[file->enum_type_count()]),
       service_generators_owner_(
-          new google::protobuf::scoped_ptr<ServiceGenerator>[ file->service_count() ]),
+          new std::unique_ptr<ServiceGenerator>[file->service_count()]),
       extension_generators_owner_(
-          new google::protobuf::scoped_ptr<ExtensionGenerator>[ file->extension_count() ]) {
-
-  for (int i = 0; i < file->message_type_count(); i++) {
-    message_generators_owner_[i].reset(
-        new MessageGenerator(file->message_type(i), options));
-    message_generators_owner_[i]->Flatten(&message_generators_);
-  }
-
-  for (int i = 0; i < message_generators_.size(); i++) {
-    message_generators_[i]->AddGenerators(&enum_generators_,
-                                          &extension_generators_);
+          new std::unique_ptr<ExtensionGenerator>[file->extension_count()]) {
+  std::vector<const Descriptor*> msgs = FlattenMessagesInFile(file);
+  for (int i = 0; i < msgs.size(); i++) {
+    // Deleted in destructor
+    MessageGenerator* msg_gen =
+        new MessageGenerator(msgs[i], i, options, &scc_analyzer_);
+    message_generators_.push_back(msg_gen);
+    msg_gen->AddGenerators(&enum_generators_, &extension_generators_);
   }
 
   for (int i = 0; i < file->enum_type_count(); i++) {
@@ -91,6 +83,11 @@ FileGenerator::FileGenerator(const FileDescriptor* file, const Options& options)
         new ServiceGenerator(file->service(i), options));
     service_generators_.push_back(service_generators_owner_[i].get());
   }
+  if (HasGenericServices(file_, options_)) {
+    for (int i = 0; i < service_generators_.size(); i++) {
+      service_generators_[i]->index_in_metadata_ = i;
+    }
+  }
 
   for (int i = 0; i < file->extension_count(); i++) {
     extension_generators_owner_[i].reset(
@@ -98,53 +95,89 @@ FileGenerator::FileGenerator(const FileDescriptor* file, const Options& options)
     extension_generators_.push_back(extension_generators_owner_[i].get());
   }
 
+
   package_parts_ = Split(file_->package(), ".", true);
 }
 
-FileGenerator::~FileGenerator() {}
+FileGenerator::~FileGenerator() {
+  for (int i = 0; i < message_generators_.size(); i++) {
+    delete message_generators_[i];
+  }
+}
+
+void FileGenerator::GenerateMacroUndefs(io::Printer* printer) {
+  // Only do this for protobuf's own types. There are some google3 protos using
+  // macros as field names and the generated code compiles after the macro
+  // expansion. Undefing these macros actually breaks such code.
+  if (file_->name() != "google/protobuf/compiler/plugin.proto") {
+    return;
+  }
+  std::vector<string> names_to_undef;
+  std::vector<const FieldDescriptor*> fields;
+  ListAllFields(file_, &fields);
+  for (int i = 0; i < fields.size(); i++) {
+    const string& name = fields[i]->name();
+    static const char* kMacroNames[] = {"major", "minor"};
+    for (int i = 0; i < GOOGLE_ARRAYSIZE(kMacroNames); ++i) {
+      if (name == kMacroNames[i]) {
+        names_to_undef.push_back(name);
+        break;
+      }
+    }
+  }
+  for (int i = 0; i < names_to_undef.size(); ++i) {
+    printer->Print(
+        "#ifdef $name$\n"
+        "#undef $name$\n"
+        "#endif\n",
+        "name", names_to_undef[i]);
+  }
+}
 
 void FileGenerator::GenerateHeader(io::Printer* printer) {
   printer->Print(
     "// @@protoc_insertion_point(includes)\n");
 
-
-  GenerateForwardDeclarations(printer);
-
-  // Open namespace.
-  GenerateNamespaceOpeners(printer);
+  printer->Print("#define PROTOBUF_INTERNAL_EXPORT_$filename$ $export$\n",
+                 "filename", FileLevelNamespace(file_),
+                 "export", options_.dllexport_decl);
+  GenerateMacroUndefs(printer);
 
   GenerateGlobalStateFunctionDeclarations(printer);
 
-  printer->Print("\n");
+  GenerateForwardDeclarations(printer);
 
-  GenerateEnumDefinitions(printer);
+  {
+    NamespaceOpener ns(Namespace(file_), printer);
 
-  printer->Print(kThickSeparator);
-  printer->Print("\n");
+    printer->Print("\n");
 
-  GenerateMessageDefinitions(printer);
+    GenerateEnumDefinitions(printer);
 
-  printer->Print("\n");
-  printer->Print(kThickSeparator);
-  printer->Print("\n");
+    printer->Print(kThickSeparator);
+    printer->Print("\n");
 
-  GenerateServiceDefinitions(printer);
+    GenerateMessageDefinitions(printer);
 
-  GenerateExtensionIdentifiers(printer);
+    printer->Print("\n");
+    printer->Print(kThickSeparator);
+    printer->Print("\n");
 
-  printer->Print("\n");
-  printer->Print(kThickSeparator);
-  printer->Print("\n");
+    GenerateServiceDefinitions(printer);
 
-  GenerateInlineFunctionDefinitions(printer);
+    GenerateExtensionIdentifiers(printer);
 
-  printer->Print(
-    "\n"
-    "// @@protoc_insertion_point(namespace_scope)\n"
-    "\n");
+    printer->Print("\n");
+    printer->Print(kThickSeparator);
+    printer->Print("\n");
 
-  // Close up namespace.
-  GenerateNamespaceClosers(printer);
+    GenerateInlineFunctionDefinitions(printer);
+
+    printer->Print(
+      "\n"
+      "// @@protoc_insertion_point(namespace_scope)\n"
+      "\n");
+  }
 
   // We need to specialize some templates in the ::google::protobuf namespace:
   GenerateProto2NamespaceEnumSpecializations(printer);
@@ -190,11 +223,13 @@ void FileGenerator::GeneratePBHeader(io::Printer* printer,
   GenerateTopHeaderGuard(printer, filename_identifier);
 
   if (options_.proto_h) {
+    string target_basename = StripProto(file_->name());
     printer->Print("#include \"$basename$.proto.h\"  // IWYU pragma: export\n",
-                   "basename", StripProto(file_->name()));
+                   "basename", target_basename);
   } else {
     GenerateLibraryIncludes(printer);
   }
+
   GenerateDependencyIncludes(printer);
   GenerateMetadataPragma(printer, info_path);
 
@@ -206,15 +241,12 @@ void FileGenerator::GeneratePBHeader(io::Printer* printer,
     // TODO(gerbens) remove this.
     printer->Print(
       "// @@protoc_insertion_point(includes)\n");
-
-    // Open namespace.
-    GenerateNamespaceOpeners(printer);
-    printer->Print(
-      "\n"
-      "// @@protoc_insertion_point(namespace_scope)\n");
-    // Close up namespace.
-    GenerateNamespaceClosers(printer);
-
+    {
+      NamespaceOpener ns(Namespace(file_), printer);
+      printer->Print(
+        "\n"
+        "// @@protoc_insertion_point(namespace_scope)\n");
+    }
     printer->Print(
       "\n"
       "// @@protoc_insertion_point(global_scope)\n"
@@ -224,24 +256,21 @@ void FileGenerator::GeneratePBHeader(io::Printer* printer,
   GenerateBottomHeaderGuard(printer, filename_identifier);
 }
 
-void FileGenerator::GenerateSource(io::Printer* printer) {
+void FileGenerator::GenerateSourceIncludes(io::Printer* printer) {
+  string target_basename = StripProto(file_->name());
   const bool use_system_include = IsWellKnownMessage(file_);
-  string header =
-      StripProto(file_->name()) + (options_.proto_h ? ".proto.h" : ".pb.h");
+
+  string header = target_basename + (options_.proto_h ? ".proto.h" : ".pb.h");
   printer->Print(
     "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
     "// source: $filename$\n"
     "\n"
-    // The generated code calls accessors that might be deprecated. We don't
-    // want the compiler to warn in generated code.
-    "#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION\n"
     "#include $left$$header$$right$\n"
     "\n"
     "#include <algorithm>\n"    // for swap()
     "\n"
     "#include <google/protobuf/stubs/common.h>\n"
     "#include <google/protobuf/stubs/port.h>\n"
-    "#include <google/protobuf/stubs/once.h>\n"
     "#include <google/protobuf/io/coded_stream.h>\n"
     "#include <google/protobuf/wire_format_lite_inl.h>\n",
     "filename", file_->name(),
@@ -268,106 +297,178 @@ void FileGenerator::GenerateSource(io::Printer* printer) {
     for (int i = 0; i < file_->dependency_count(); i++) {
       const FileDescriptor* dep = file_->dependency(i);
       const char* extension = ".proto.h";
-      string dependency = StripProto(dep->name()) + extension;
+      string basename = StripProto(dep->name());
+      string dependency = basename + extension;
       printer->Print(
           "#include \"$dependency$\"\n",
           "dependency", dependency);
     }
   }
 
+  // TODO(gerbens) Remove this when all code in google is using the same
+  // proto library. This is a temporary hack to force build errors if
+  // the proto library is compiled with GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+  // and is also linking internal proto2. This is to prevent regressions while
+  // we work cleaning up the code base. After this is completed and we have
+  // one proto lib all code uses this should be removed.
+  printer->Print(
+    "// This is a temporary google only hack\n"
+    "#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS\n"
+    "#include \"third_party/protobuf/version.h\"\n"
+    "#endif\n");
+
   printer->Print(
     "// @@protoc_insertion_point(includes)\n");
+}
 
-  GenerateNamespaceOpeners(printer);
+void FileGenerator::GenerateSourceDefaultInstance(int idx,
+                                                  io::Printer* printer) {
+  printer->Print(
+      "class $classname$DefaultTypeInternal {\n"
+      " public:\n"
+      "  ::google::protobuf::internal::ExplicitlyConstructed<$classname$>\n"
+      "      _instance;\n",
+      "classname", message_generators_[idx]->classname_);
+  printer->Indent();
+  message_generators_[idx]->GenerateExtraDefaultFields(printer);
+  printer->Outdent();
+  printer->Print("} _$classname$_default_instance_;\n", "classname",
+                 message_generators_[idx]->classname_);
+}
 
-  for (int i = 0; i < message_generators_.size(); i++) {
-    if (IsMapEntryMessage(message_generators_[i]->descriptor_)) continue;
-    printer->Print(
-        "class $classname$DefaultTypeInternal : "
-        "public ::google::protobuf::internal::ExplicitlyConstructed<$classname$> {\n",
-        "classname", message_generators_[i]->classname_);
-    printer->Indent();
-    message_generators_[i]->GenerateExtraDefaultFields(printer);
-    printer->Outdent();
-    printer->Print(
-        "} _$classname$_default_instance_;\n",
-        "classname", message_generators_[i]->classname_);
+namespace {
+
+// Generates weak symbol declarations for types that are to be considered weakly
+// referenced.
+void GenerateInternalForwardDeclarations(
+    const std::vector<const FieldDescriptor*>& fields, const Options& options,
+    SCCAnalyzer* scc_analyzer, io::Printer* printer) {
+  // To ensure determinism and minimize the number of namespace statements,
+  // we output the forward declarations sorted on namespace and type / function
+  // name.
+  std::set<std::pair<string, string> > messages;
+  std::set<std::pair<string, string> > sccs;
+  std::set<std::pair<string, string> > inits;
+  for (int i = 0; i < fields.size(); ++i) {
+    const FieldDescriptor* field = fields[i];
+    const Descriptor* msg = field->message_type();
+    if (msg == nullptr) continue;
+    bool is_weak = IsImplicitWeakField(field, options, scc_analyzer);
+    string flns = FileLevelNamespace(msg);
+    auto scc = scc_analyzer->GetSCC(msg);
+    string repr = ClassName(scc->GetRepresentative());
+    string weak_attr;
+    if (is_weak) {
+      inits.insert(std::make_pair(flns, "AddDescriptors"));
+      messages.insert(std::make_pair(Namespace(msg), ClassName(msg)));
+      weak_attr = " __attribute__((weak))";
+    }
+    string dllexport = "PROTOBUF_INTERNAL_EXPORT_" + FileLevelNamespace(msg);
+    sccs.insert(std::make_pair(flns, "extern " + dllexport + weak_attr +
+                                     " ::google::protobuf::internal::SCCInfo<" +
+                                     SimpleItoa(scc->children.size()) +
+                                     "> scc_info_" + repr + ";\n"));
   }
 
-  for (int i = 0; i < message_generators_.size(); i++) {
-    message_generators_[i]->index_in_metadata_ = i;
+  printer->Print("\n");
+  NamespaceOpener ns(printer);
+  for (std::set<std::pair<string, string> >::const_iterator it =
+           messages.begin();
+       it != messages.end(); ++it) {
+    ns.ChangeTo(it->first);
+    printer->Print(
+        "extern __attribute__((weak)) $classname$DefaultTypeInternal "
+        "_$classname$_default_instance_;\n",
+        "classname", it->second);
   }
-  for (int i = 0; i < enum_generators_.size(); i++) {
-    enum_generators_[i]->index_in_metadata_ = i;
+  for (std::set<std::pair<string, string> >::const_iterator it = inits.begin();
+       it != inits.end(); ++it) {
+    ns.ChangeTo(it->first);
+    printer->Print("void $name$() __attribute__((weak));\n",
+                   "name", it->second);
   }
-  if (HasGenericServices(file_, options_)) {
-    for (int i = 0; i < service_generators_.size(); i++) {
-      service_generators_[i]->index_in_metadata_ = i;
-    }
+  for (const auto& p : sccs) {
+    ns.ChangeTo(p.first);
+    printer->Print(p.second.c_str());
   }
+}
 
-  printer->Print(
-      "\n"
-      "namespace $file_namespace$ {\n"
-      "\n",
-      "file_namespace", FileLevelNamespace(file_->name()));
+}  // namespace
 
-  if (HasDescriptorMethods(file_, options_)) {
-    printer->Print(
-      "\n"
-      "namespace {\n"
-      "\n");
+void FileGenerator::GenerateSourceForMessage(int idx, io::Printer* printer) {
+  GenerateSourceIncludes(printer);
 
-    if (!message_generators_.empty()) {
-      printer->Print("::google::protobuf::Metadata file_level_metadata[$size$];\n",
-                     "size", SimpleItoa(message_generators_.size()));
-    }
-    if (!enum_generators_.empty()) {
-      printer->Print(
-          "const ::google::protobuf::EnumDescriptor* "
-          "file_level_enum_descriptors[$size$];\n",
-          "size", SimpleItoa(enum_generators_.size()));
-    }
-    if (HasGenericServices(file_, options_) && file_->service_count() > 0) {
-      printer->Print(
-          "const ::google::protobuf::ServiceDescriptor* "
-          "file_level_service_descriptors[$size$];\n",
-          "size", SimpleItoa(file_->service_count()));
+  // Generate weak declarations. We do this for the whole strongly-connected
+  // component (SCC), because we have a single InitDefaults* function for the
+  // SCC.
+  std::vector<const FieldDescriptor*> fields;
+  for (const Descriptor* message :
+       scc_analyzer_.GetSCC(message_generators_[idx]->descriptor_)
+           ->descriptors) {
+    ListAllFields(message, &fields);
+  }
+  GenerateInternalForwardDeclarations(fields, options_, &scc_analyzer_,
+                                      printer);
+
+  if (IsSCCRepresentative(message_generators_[idx]->descriptor_)) {
+    NamespaceOpener ns(FileLevelNamespace(file_), printer);
+    GenerateInitForSCC(GetSCC(message_generators_[idx]->descriptor_), printer);
+  }
+
+  {  // package namespace
+    NamespaceOpener ns(Namespace(file_), printer);
+
+    // Define default instances
+    GenerateSourceDefaultInstance(idx, printer);
+    if (options_.lite_implicit_weak_fields) {
+      printer->Print("void $classname$_ReferenceStrong() {}\n", "classname",
+                     message_generators_[idx]->classname_);
     }
 
+    // Generate classes.
+    printer->Print("\n");
+    message_generators_[idx]->GenerateClassMethods(printer);
+
     printer->Print(
-      "\n"
-      "}  // namespace\n"
-      "\n");
-  }
+        "\n"
+        "// @@protoc_insertion_point(namespace_scope)\n");
+  }  // end package namespace
 
-  // Define our externally-visible BuildDescriptors() function.  (For the lite
-  // library, all this does is initialize default instances.)
-  GenerateBuildDescriptors(printer);
+  printer->Print(
+      "namespace google {\nnamespace protobuf {\n");
+  message_generators_[idx]->GenerateSourceInProto2Namespace(printer);
+  printer->Print(
+      "}  // namespace protobuf\n}  // namespace google\n");
 
   printer->Print(
       "\n"
-      "}  // namespace $file_namespace$\n"
-      "\n",
-      "file_namespace", FileLevelNamespace(file_->name()));
+      "// @@protoc_insertion_point(global_scope)\n");
+}
+
+void FileGenerator::GenerateGlobalSource(io::Printer* printer) {
+  GenerateSourceIncludes(printer);
+
+  {
+    NamespaceOpener ns(FileLevelNamespace(file_), printer);
+    GenerateTables(printer);
+
+    // Define the code to initialize reflection. This code uses a global
+    // constructor to register reflection data with the runtime pre-main.
+    if (HasDescriptorMethods(file_, options_)) {
+      GenerateReflectionInitializationCode(printer);
+    }
+  }
+
+  NamespaceOpener ns(Namespace(file_), printer);
 
   // Generate enums.
   for (int i = 0; i < enum_generators_.size(); i++) {
-    enum_generators_[i]->GenerateMethods(printer);
+    enum_generators_[i]->GenerateMethods(i, printer);
   }
 
-  // Generate classes.
-  for (int i = 0; i < message_generators_.size(); i++) {
-    printer->Print("\n");
-    printer->Print(kThickSeparator);
-    printer->Print("\n");
-    message_generators_[i]->GenerateClassMethods(printer);
-
-    printer->Print("#if PROTOBUF_INLINE_NOT_IN_HEADERS\n");
-    // Generate class inline methods.
-    message_generators_[i]->GenerateInlineMethods(printer,
-                                                  /* is_inline = */ false);
-    printer->Print("#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS\n");
+  // Define extensions.
+  for (int i = 0; i < extension_generators_.size(); i++) {
+    extension_generators_[i]->GenerateDefinition(printer);
   }
 
   if (HasGenericServices(file_, options_)) {
@@ -379,17 +480,103 @@ void FileGenerator::GenerateSource(io::Printer* printer) {
       service_generators_[i]->GenerateImplementation(printer);
     }
   }
+}
+
+void FileGenerator::GenerateSource(io::Printer* printer) {
+  GenerateSourceIncludes(printer);
+  std::vector<const FieldDescriptor*> fields;
+  ListAllFields(file_, &fields);
+  GenerateInternalForwardDeclarations(fields, options_, &scc_analyzer_,
+                                      printer);
+
+  {
+    NamespaceOpener ns(Namespace(file_), printer);
+
+    // Define default instances
+    for (int i = 0; i < message_generators_.size(); i++) {
+      GenerateSourceDefaultInstance(i, printer);
+      if (options_.lite_implicit_weak_fields) {
+        printer->Print("void $classname$_ReferenceStrong() {}\n", "classname",
+                       message_generators_[i]->classname_);
+      }
+    }
+  }
 
-  // Define extensions.
-  for (int i = 0; i < extension_generators_.size(); i++) {
-    extension_generators_[i]->GenerateDefinition(printer);
+  {
+    NamespaceOpener ns(FileLevelNamespace(file_), printer);
+    GenerateTables(printer);
+
+    // Now generate the InitDefaults for each SCC.
+    for (int i = 0; i < message_generators_.size(); i++) {
+      if (IsSCCRepresentative(message_generators_[i]->descriptor_)) {
+        GenerateInitForSCC(GetSCC(message_generators_[i]->descriptor_),
+                           printer);
+      }
+    }
+
+    printer->Print("void InitDefaults() {\n");
+    for (int i = 0; i < message_generators_.size(); i++) {
+      if (!IsSCCRepresentative(message_generators_[i]->descriptor_)) continue;
+      string scc_name = ClassName(message_generators_[i]->descriptor_);
+      printer->Print(
+          "  ::google::protobuf::internal::InitSCC(&scc_info_$scc_name$.base);\n",
+          "scc_name", scc_name);
+    }
+    printer->Print("}\n\n");
+
+    // Define the code to initialize reflection. This code uses a global
+    // constructor to register reflection data with the runtime pre-main.
+    if (HasDescriptorMethods(file_, options_)) {
+      GenerateReflectionInitializationCode(printer);
+    }
   }
 
-  printer->Print(
-    "\n"
-    "// @@protoc_insertion_point(namespace_scope)\n");
 
-  GenerateNamespaceClosers(printer);
+  {
+    NamespaceOpener ns(Namespace(file_), printer);
+
+    // Actually implement the protos
+
+    // Generate enums.
+    for (int i = 0; i < enum_generators_.size(); i++) {
+      enum_generators_[i]->GenerateMethods(i, printer);
+    }
+
+    // Generate classes.
+    for (int i = 0; i < message_generators_.size(); i++) {
+      printer->Print("\n");
+      printer->Print(kThickSeparator);
+      printer->Print("\n");
+      message_generators_[i]->GenerateClassMethods(printer);
+    }
+
+    if (HasGenericServices(file_, options_)) {
+      // Generate services.
+      for (int i = 0; i < service_generators_.size(); i++) {
+        if (i == 0) printer->Print("\n");
+        printer->Print(kThickSeparator);
+        printer->Print("\n");
+        service_generators_[i]->GenerateImplementation(printer);
+      }
+    }
+
+    // Define extensions.
+    for (int i = 0; i < extension_generators_.size(); i++) {
+      extension_generators_[i]->GenerateDefinition(printer);
+    }
+
+    printer->Print(
+      "\n"
+      "// @@protoc_insertion_point(namespace_scope)\n");
+  }
+
+  printer->Print(
+      "namespace google {\nnamespace protobuf {\n");
+  for (int i = 0; i < message_generators_.size(); i++) {
+    message_generators_[i]->GenerateSourceInProto2Namespace(printer);
+  }
+  printer->Print(
+      "}  // namespace protobuf\n}  // namespace google\n");
 
   printer->Print(
     "\n"
@@ -410,7 +597,7 @@ class FileGenerator::ForwardDeclarations {
 
   ForwardDeclarations* AddOrGetNamespace(const string& ns_name) {
     ForwardDeclarations*& ns = namespaces_[ns_name];
-    if (ns == NULL) {
+    if (ns == nullptr) {
       ns = new ForwardDeclarations;
     }
     return ns;
@@ -419,7 +606,42 @@ class FileGenerator::ForwardDeclarations {
   std::map<string, const Descriptor*>& classes() { return classes_; }
   std::map<string, const EnumDescriptor*>& enums() { return enums_; }
 
-  void Print(io::Printer* printer, const Options& options) const {
+  void PrintForwardDeclarations(io::Printer* printer,
+                                const Options& options) const {
+    PrintNestedDeclarations(printer, options);
+    PrintTopLevelDeclarations(printer, options);
+  }
+
+
+ private:
+  void PrintNestedDeclarations(io::Printer* printer,
+                               const Options& options) const {
+    PrintDeclarationsInsideNamespace(printer, options);
+    for (std::map<string, ForwardDeclarations *>::const_iterator
+             it = namespaces_.begin(),
+             end = namespaces_.end();
+         it != end; ++it) {
+      printer->Print("namespace $nsname$ {\n",
+                     "nsname", it->first);
+      it->second->PrintNestedDeclarations(printer, options);
+      printer->Print("}  // namespace $nsname$\n",
+                     "nsname", it->first);
+    }
+  }
+
+  void PrintTopLevelDeclarations(io::Printer* printer,
+                                 const Options& options) const {
+    PrintDeclarationsOutsideNamespace(printer, options);
+    for (std::map<string, ForwardDeclarations *>::const_iterator
+             it = namespaces_.begin(),
+             end = namespaces_.end();
+         it != end; ++it) {
+      it->second->PrintTopLevelDeclarations(printer, options);
+    }
+  }
+
+  void PrintDeclarationsInsideNamespace(io::Printer* printer,
+                                        const Options& options) const {
     for (std::map<string, const EnumDescriptor *>::const_iterator
              it = enums_.begin(),
              end = enums_.end();
@@ -445,34 +667,46 @@ class FileGenerator::ForwardDeclarations {
           options.dllexport_decl.empty() ? "" : options.dllexport_decl + " ",
           "classname",
           it->first);
+      if (options.lite_implicit_weak_fields) {
+        printer->Print("void $classname$_ReferenceStrong();\n",
+                       "classname", it->first);
+      }
     }
-    for (std::map<string, ForwardDeclarations *>::const_iterator
-             it = namespaces_.begin(),
-             end = namespaces_.end();
+  }
+
+  void PrintDeclarationsOutsideNamespace(io::Printer* printer,
+                                         const Options& options) const {
+    if (classes_.size() == 0) return;
+
+    printer->Print(
+        "namespace google {\nnamespace protobuf {\n");
+    for (std::map<string, const Descriptor*>::const_iterator
+             it = classes_.begin(),
+             end = classes_.end();
          it != end; ++it) {
-      printer->Print("namespace $nsname$ {\n",
-                     "nsname", it->first);
-      it->second->Print(printer, options);
-      printer->Print("}  // namespace $nsname$\n",
-                     "nsname", it->first);
+      const Descriptor* d = it->second;
+      printer->Print(
+          "template<> "
+          "$dllexport_decl$"
+          "$classname$* Arena::CreateMaybeMessage<$classname$>"
+          "(Arena*);\n",
+          "classname", QualifiedClassName(d), "dllexport_decl",
+          options.dllexport_decl.empty() ? "" : options.dllexport_decl + " ");
     }
+    printer->Print(
+        "}  // namespace protobuf\n}  // namespace google\n");
   }
 
-
- private:
   std::map<string, ForwardDeclarations*> namespaces_;
   std::map<string, const Descriptor*> classes_;
   std::map<string, const EnumDescriptor*> enums_;
 };
 
-void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
+void FileGenerator::GenerateReflectionInitializationCode(io::Printer* printer) {
   // AddDescriptors() is a file-level procedure which adds the encoded
   // FileDescriptorProto for this .proto file to the global DescriptorPool for
-  // generated files (DescriptorPool::generated_pool()). It either runs at
-  // static initialization time (by default) or when default_instance() is
-  // called for the first time (in LITE_RUNTIME mode with
-  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER flag enabled). This procedure also
-  // constructs default instances and registers extensions.
+  // generated files (DescriptorPool::generated_pool()). It ordinarily runs at
+  // static initialization time, but is not used at all in LITE_RUNTIME mode.
   //
   // Its sibling, AssignDescriptors(), actually pulls the compiled
   // FileDescriptor from the DescriptorPool and uses it to populate all of
@@ -481,85 +715,106 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
   // anyone calls descriptor() or GetReflection() on one of the types defined
   // in the file.
 
-  // In optimize_for = LITE_RUNTIME mode, we don't generate AssignDescriptors()
-  // and we only use AddDescriptors() to allocate default instances.
+  if (!message_generators_.empty()) {
+    printer->Print("::google::protobuf::Metadata file_level_metadata[$size$];\n", "size",
+                   SimpleItoa(message_generators_.size()));
+  }
+  if (!enum_generators_.empty()) {
+    printer->Print(
+        "const ::google::protobuf::EnumDescriptor* "
+        "file_level_enum_descriptors[$size$];\n",
+        "size", SimpleItoa(enum_generators_.size()));
+  }
+  if (HasGenericServices(file_, options_) && file_->service_count() > 0) {
+    printer->Print(
+        "const ::google::protobuf::ServiceDescriptor* "
+        "file_level_service_descriptors[$size$];\n",
+        "size", SimpleItoa(file_->service_count()));
+  }
 
-  if (HasDescriptorMethods(file_, options_)) {
-    if (!message_generators_.empty()) {
-      printer->Print("const ::google::protobuf::uint32 TableStruct::offsets[] = {\n");
-      printer->Indent();
-      std::vector<std::pair<size_t, size_t> > pairs;
-      for (int i = 0; i < message_generators_.size(); i++) {
-        pairs.push_back(message_generators_[i]->GenerateOffsets(printer));
-      }
-      printer->Outdent();
-      printer->Print(
-          "};\n"
-          "\n"
-          "static const ::google::protobuf::internal::MigrationSchema schemas[] = {\n");
-      printer->Indent();
-      {
-        int offset = 0;
-        for (int i = 0; i < message_generators_.size(); i++) {
-          message_generators_[i]->GenerateSchema(printer, offset,
-                                                 pairs[i].second);
-          offset += pairs[i].first;
-        }
-      }
-      printer->Outdent();
-      printer->Print(
-          "};\n"
-          "\nstatic "
-          "::google::protobuf::Message const * const file_default_instances[] = {\n");
-      printer->Indent();
+  if (!message_generators_.empty()) {
+    printer->Print(
+        "\n"
+        "const ::google::protobuf::uint32 TableStruct::offsets[] "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {\n");
+    printer->Indent();
+    std::vector<std::pair<size_t, size_t> > pairs;
+    pairs.reserve(message_generators_.size());
+    for (int i = 0; i < message_generators_.size(); i++) {
+      pairs.push_back(message_generators_[i]->GenerateOffsets(printer));
+    }
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "static const ::google::protobuf::internal::MigrationSchema schemas[] "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {\n");
+    printer->Indent();
+    {
+      int offset = 0;
       for (int i = 0; i < message_generators_.size(); i++) {
-        const Descriptor* descriptor = message_generators_[i]->descriptor_;
-        if (IsMapEntryMessage(descriptor)) continue;
-
-        printer->Print(
-            "reinterpret_cast<const "
-            "::google::protobuf::Message*>(&_$classname$_default_instance_),\n",
-            "classname", ClassName(descriptor, false));
+        message_generators_[i]->GenerateSchema(printer, offset,
+                                               pairs[i].second);
+        offset += pairs[i].first;
       }
-      printer->Outdent();
-      printer->Print(
-          "};\n"
-          "\n");
-    } else {
-      // we still need these symbols to exist
+    }
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "\nstatic "
+        "::google::protobuf::Message const * const file_default_instances[] = {\n");
+    printer->Indent();
+    for (int i = 0; i < message_generators_.size(); i++) {
+      const Descriptor* descriptor = message_generators_[i]->descriptor_;
       printer->Print(
-          // MSVC doesn't like empty arrays, so we add a dummy.
-          "const ::google::protobuf::uint32 TableStruct::offsets[] = { ~0u };\n"
-          "static const ::google::protobuf::internal::MigrationSchema* schemas = NULL;\n"
-          "static const ::google::protobuf::Message* const* "
-          "file_default_instances = NULL;\n");
+          "reinterpret_cast<const "
+          "::google::protobuf::Message*>(&$ns$::_$classname$_default_instance_),\n",
+          "classname", ClassName(descriptor), "ns", Namespace(descriptor));
     }
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "\n");
+  } else {
+    // we still need these symbols to exist
+    printer->Print(
+        // MSVC doesn't like empty arrays, so we add a dummy.
+        "const ::google::protobuf::uint32 TableStruct::offsets[1] = {};\n"
+        "static const ::google::protobuf::internal::MigrationSchema* schemas = NULL;\n"
+        "static const ::google::protobuf::Message* const* "
+        "file_default_instances = NULL;\n"
+        "\n");
+  }
 
-    // ---------------------------------------------------------------
+  // ---------------------------------------------------------------
 
-    // protobuf_AssignDescriptorsOnce():  The first time it is called, calls
-    // AssignDescriptors().  All later times, waits for the first call to
-    // complete and then returns.
-    string message_factory = "NULL";
+  // protobuf_AssignDescriptorsOnce():  The first time it is called, calls
+  // AssignDescriptors().  All later times, waits for the first call to
+  // complete and then returns.
     printer->Print(
-        "namespace {\n"
-        "\n"
         "void protobuf_AssignDescriptors() {\n"
         // Make sure the file has found its way into the pool.  If a descriptor
         // is requested *during* static init then AddDescriptors() may not have
         // been called yet, so we call it manually.  Note that it's fine if
         // AddDescriptors() is called multiple times.
         "  AddDescriptors();\n"
-        "  ::google::protobuf::MessageFactory* factory = $factory$;\n"
         "  AssignDescriptors(\n"
         "      \"$filename$\", schemas, file_default_instances, "
-        "TableStruct::offsets, factory,\n"
-        "      $metadata$, $enum_descriptors$, $service_descriptors$);\n"
+        "TableStruct::offsets,\n"
+        "      $metadata$, $enum_descriptors$, $service_descriptors$);\n",
+        "filename", file_->name(), "metadata",
+        !message_generators_.empty() ? "file_level_metadata" : "NULL",
+        "enum_descriptors",
+        !enum_generators_.empty() ? "file_level_enum_descriptors" : "NULL",
+        "service_descriptors",
+        HasGenericServices(file_, options_) && file_->service_count() > 0
+            ? "file_level_service_descriptors"
+            : "NULL");
+    printer->Print(
         "}\n"
         "\n"
         "void protobuf_AssignDescriptorsOnce() {\n"
-        "  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);\n"
-        "  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);\n"
+        "  static ::google::protobuf::internal::once_flag once;\n"
+        "  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);\n"
         "}\n"
         "\n",
         "filename", file_->name(), "metadata",
@@ -569,14 +824,14 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
         "service_descriptors",
         HasGenericServices(file_, options_) && file_->service_count() > 0
             ? "file_level_service_descriptors"
-            : "NULL",
-        "factory", message_factory);
+            : "NULL");
 
     // Only here because of useless string reference that we don't want in
     // protobuf_AssignDescriptorsOnce, because that is called from all the
     // GetMetadata member methods.
     printer->Print(
-        "void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;\n"
+        "void protobuf_RegisterTypes(const ::std::string&) "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_COLD;\n"
         "void protobuf_RegisterTypes(const ::std::string&) {\n"
         "  protobuf_AssignDescriptorsOnce();\n");
     printer->Indent();
@@ -588,88 +843,17 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
         "size", SimpleItoa(message_generators_.size()));
     }
 
-    // Map types are treated special
-    // TODO(gerbens) find a way to treat maps more like normal messages.
-    for (int i = 0; i < message_generators_.size(); i++) {
-      message_generators_[i]->GenerateTypeRegistrations(printer);
-    }
-
     printer->Outdent();
     printer->Print(
-      "}\n"
-      "\n"
-      "}  // namespace\n");
-  }
-
-  // -----------------------------------------------------------------
-
-  // ShutdownFile():  Deletes descriptors, default instances, etc. on shutdown.
-  printer->Print(
-    "\n"
-    "void TableStruct::Shutdown() {\n");
-  printer->Indent();
-
-  for (int i = 0; i < message_generators_.size(); i++) {
-    message_generators_[i]->GenerateShutdownCode(printer);
-  }
-
-  printer->Outdent();
-  printer->Print(
-    "}\n\n");
-
-  // -----------------------------------------------------------------
-
-  // Now generate the InitDefaultsImpl() function.
-  printer->Print(
-      "void TableStruct::InitDefaultsImpl() {\n"
-      "  GOOGLE_PROTOBUF_VERIFY_VERSION;\n\n"
-      // Force initialization of primitive values we depend on.
-      "  ::google::protobuf::internal::InitProtobufDefaults();\n");
-
-  printer->Indent();
-
-  // Call the InitDefaults() methods for all of our dependencies, to make
-  // sure they get added first.
-  for (int i = 0; i < file_->dependency_count(); i++) {
-    const FileDescriptor* dependency = file_->dependency(i);
-    // Print the namespace prefix for the dependency.
-    string file_namespace = QualifiedFileLevelSymbol(
-        dependency->package(), FileLevelNamespace(dependency->name()));
-    // Call its AddDescriptors function.
-    printer->Print("$file_namespace$::InitDefaults();\n", "file_namespace",
-                   file_namespace);
-  }
-
-  // Allocate and initialize default instances.  This can't be done lazily
-  // since default instances are returned by simple accessors and are used with
-  // extensions.  Speaking of which, we also register extensions at this time.
-  for (int i = 0; i < message_generators_.size(); i++) {
-    message_generators_[i]->GenerateDefaultInstanceAllocator(printer);
-  }
-  for (int i = 0; i < extension_generators_.size(); i++) {
-    extension_generators_[i]->GenerateRegistration(printer);
-  }
-  for (int i = 0; i < message_generators_.size(); i++) {
-    message_generators_[i]->GenerateDefaultInstanceInitializer(printer);
-  }
-  printer->Outdent();
-  printer->Print(
-      "}\n"
-      "\n"
-      "void InitDefaults() {\n"
-      "  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);\n"
-      "  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);\n"
-      "}\n");
-
-  // -----------------------------------------------------------------
+        "}\n"
+        "\n");
 
-  // Now generate the AddDescriptors() function.
-  printer->Print(
-      "void AddDescriptorsImpl() {\n"
-      "  InitDefaults();\n");
+    // Now generate the AddDescriptors() function.
+    printer->Print(
+        "void AddDescriptorsImpl() {\n"
+        "  InitDefaults();\n");
+    printer->Indent();
 
-  printer->Indent();
-  if (HasDescriptorMethods(file_, options_)) {
     // Embed the descriptor.  We simply serialize the entire
     // FileDescriptorProto
     // and embed it as a string literal, which is parsed and built into real
@@ -679,10 +863,12 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
     string file_data;
     file_proto.SerializeToString(&file_data);
 
-    printer->Print("static const char descriptor[] = {\n");
+    printer->Print("static const char descriptor[] "
+                   "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) "
+                   "= {\n");
     printer->Indent();
 
-    if (file_data.size() > 66535) {
+    if (file_data.size() > 65535) {
       // Workaround for MSVC: "Error C1091: compiler limit: string exceeds 65535
       // bytes in length". Declare a static array of characters rather than use
       // a string literal. Only write 25 bytes per line.
@@ -716,81 +902,216 @@ void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
       "::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(\n"
       "  \"$filename$\", &protobuf_RegisterTypes);\n",
       "filename", file_->name());
-  }
 
   // Call the AddDescriptors() methods for all of our dependencies, to make
   // sure they get added first.
   for (int i = 0; i < file_->dependency_count(); i++) {
     const FileDescriptor* dependency = file_->dependency(i);
     // Print the namespace prefix for the dependency.
-    string file_namespace = QualifiedFileLevelSymbol(
-        dependency->package(), FileLevelNamespace(dependency->name()));
+    string file_namespace = FileLevelNamespace(dependency);
     // Call its AddDescriptors function.
-    printer->Print("$file_namespace$::AddDescriptors();\n", "file_namespace",
+    printer->Print("::$file_namespace$::AddDescriptors();\n", "file_namespace",
                    file_namespace);
   }
 
-  printer->Print(
-      "::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);\n");
-
   printer->Outdent();
   printer->Print(
       "}\n"
       "\n"
       "void AddDescriptors() {\n"
-      "  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);\n"
-      "  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);\n"
+        "  static ::google::protobuf::internal::once_flag once;\n"
+        "  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);\n"
       "}\n");
 
-  if (!StaticInitializersForced(file_, options_)) {
-    printer->Print("#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER\n");
-  }
+    printer->Print(
+        "// Force AddDescriptors() to be called at dynamic initialization "
+        "time.\n"
+        "struct StaticDescriptorInitializer {\n"
+        "  StaticDescriptorInitializer() {\n"
+        "    AddDescriptors();\n"
+        "  }\n"
+        "} static_descriptor_initializer;\n");
+}
+
+void FileGenerator::GenerateInitForSCC(const SCC* scc, io::Printer* printer) {
+  const string scc_name = ClassName(scc->GetRepresentative());
+  // We use static and not anonymous namespace because symbol names are
+  // substantially shorter.
   printer->Print(
-      // With static initializers.
-      "// Force AddDescriptors() to be called at static initialization time.\n"
-      "struct StaticDescriptorInitializer {\n"
-      "  StaticDescriptorInitializer() {\n"
-      "    AddDescriptors();\n"
-      "  }\n"
-      "} static_descriptor_initializer;\n");
-  if (!StaticInitializersForced(file_, options_)) {
-    printer->Print("#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER\n");
+      "static void InitDefaults$scc_name$() {\n"
+      "  GOOGLE_PROTOBUF_VERIFY_VERSION;\n\n"
+      ,  // awkward comma due to macro
+      "scc_name", scc_name);
+
+  printer->Indent();
+
+
+  // First construct all the necessary default instances.
+  for (int i = 0; i < message_generators_.size(); i++) {
+    if (scc_analyzer_.GetSCC(message_generators_[i]->descriptor_) != scc) {
+      continue;
+    }
+    // TODO(gerbens) This requires this function to be friend. Remove
+    // the need for this.
+    message_generators_[i]->GenerateFieldDefaultInstances(printer);
+    printer->Print(
+        "{\n"
+        "  void* ptr = &$ns$::_$classname$_default_instance_;\n"
+        "  new (ptr) $ns$::$classname$();\n",
+        "ns", Namespace(message_generators_[i]->descriptor_),
+        "classname", ClassName(message_generators_[i]->descriptor_));
+    if (!IsMapEntryMessage(message_generators_[i]->descriptor_)) {
+      printer->Print(
+          "  ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);\n");
+    }
+    printer->Print("}\n");
   }
-}
 
-void FileGenerator::GenerateNamespaceOpeners(io::Printer* printer) {
-  if (package_parts_.size() > 0) printer->Print("\n");
+  // TODO(gerbens) make default instances be the same as normal instances.
+  // Default instances differ from normal instances because they have cross
+  // linked message fields.
+  for (int i = 0; i < message_generators_.size(); i++) {
+    if (scc_analyzer_.GetSCC(message_generators_[i]->descriptor_) != scc) {
+      continue;
+    }
+    printer->Print("$classname$::InitAsDefaultInstance();\n", "classname",
+                   QualifiedClassName(message_generators_[i]->descriptor_));
+  }
+  printer->Outdent();
+  printer->Print("}\n\n");
 
-  for (int i = 0; i < package_parts_.size(); i++) {
-    printer->Print("namespace $part$ {\n",
-                   "part", package_parts_[i]);
+  printer->Print(
+      "$dllexport_decl$::google::protobuf::internal::SCCInfo<$size$> "
+      "scc_info_$scc_name$ =\n"
+      "    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), "
+      "$size$, InitDefaults$scc_name$}, {",
+      "size", SimpleItoa(scc->children.size()), "scc_name",
+      ClassName(scc->GetRepresentative()), "dllexport_decl",
+      options_.dllexport_decl.empty() ? "" : options_.dllexport_decl + " ");
+  for (const SCC* child : scc->children) {
+    auto repr = child->GetRepresentative();
+    printer->Print("\n      &$ns$::scc_info_$child$.base,", "ns",
+                   FileLevelNamespace(repr), "child", ClassName(repr));
   }
+  printer->Print("}};\n\n");
 }
 
-void FileGenerator::GenerateNamespaceClosers(io::Printer* printer) {
-  if (package_parts_.size() > 0) printer->Print("\n");
+void FileGenerator::GenerateTables(io::Printer* printer) {
+  if (options_.table_driven_parsing) {
+    // TODO(ckennelly): Gate this with the same options flag to enable
+    // table-driven parsing.
+    printer->Print(
+        "PROTOBUF_CONSTEXPR_VAR ::google::protobuf::internal::ParseTableField\n"
+        "    const TableStruct::entries[] "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {\n");
+    printer->Indent();
+
+    std::vector<size_t> entries;
+    size_t count = 0;
+    for (int i = 0; i < message_generators_.size(); i++) {
+      size_t value = message_generators_[i]->GenerateParseOffsets(printer);
+      entries.push_back(value);
+      count += value;
+    }
+
+    // We need these arrays to exist, and MSVC does not like empty arrays.
+    if (count == 0) {
+      printer->Print("{0, 0, 0, ::google::protobuf::internal::kInvalidMask, 0, 0},\n");
+    }
+
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "\n"
+        "PROTOBUF_CONSTEXPR_VAR ::google::protobuf::internal::AuxillaryParseTableField\n"
+        "    const TableStruct::aux[] "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {\n");
+    printer->Indent();
+
+    std::vector<size_t> aux_entries;
+    count = 0;
+    for (int i = 0; i < message_generators_.size(); i++) {
+      size_t value = message_generators_[i]->GenerateParseAuxTable(printer);
+      aux_entries.push_back(value);
+      count += value;
+    }
+
+    if (count == 0) {
+      printer->Print("::google::protobuf::internal::AuxillaryParseTableField(),\n");
+    }
+
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "PROTOBUF_CONSTEXPR_VAR ::google::protobuf::internal::ParseTable const\n"
+        "    TableStruct::schema[] "
+        "GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {\n");
+    printer->Indent();
+
+    size_t offset = 0;
+    size_t aux_offset = 0;
+    for (int i = 0; i < message_generators_.size(); i++) {
+      message_generators_[i]->GenerateParseTable(printer, offset, aux_offset);
+      offset += entries[i];
+      aux_offset += aux_entries[i];
+    }
+
+    if (message_generators_.empty()) {
+      printer->Print("{ NULL, NULL, 0, -1, -1, false },\n");
+    }
 
-  for (int i = package_parts_.size() - 1; i >= 0; i--) {
-    printer->Print("}  // namespace $part$\n",
-                   "part", package_parts_[i]);
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "\n");
+  }
+
+  if (!message_generators_.empty() && options_.table_driven_serialization) {
+    printer->Print(
+        "const ::google::protobuf::internal::FieldMetadata TableStruct::field_metadata[] "
+        "= {\n");
+    printer->Indent();
+    std::vector<int> field_metadata_offsets;
+    int idx = 0;
+    for (int i = 0; i < message_generators_.size(); i++) {
+      field_metadata_offsets.push_back(idx);
+      idx += message_generators_[i]->GenerateFieldMetadata(printer);
+    }
+    field_metadata_offsets.push_back(idx);
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "const ::google::protobuf::internal::SerializationTable "
+        "TableStruct::serialization_table[] = {\n");
+    printer->Indent();
+    // We rely on the order we layout the tables to match the order we
+    // calculate them with FlattenMessagesInFile, so we check here that
+    // these match exactly.
+    std::vector<const Descriptor*> calculated_order =
+        FlattenMessagesInFile(file_);
+    GOOGLE_CHECK_EQ(calculated_order.size(), message_generators_.size());
+    for (int i = 0; i < message_generators_.size(); i++) {
+      GOOGLE_CHECK_EQ(calculated_order[i], message_generators_[i]->descriptor_);
+      printer->Print(
+          "{$num_fields$, TableStruct::field_metadata + $index$},\n",
+          "classname", message_generators_[i]->classname_, "num_fields",
+          SimpleItoa(field_metadata_offsets[i + 1] - field_metadata_offsets[i]),
+          "index", SimpleItoa(field_metadata_offsets[i]));
+    }
+    printer->Outdent();
+    printer->Print(
+        "};\n"
+        "\n");
   }
 }
 
 void FileGenerator::GenerateForwardDeclarations(io::Printer* printer) {
   ForwardDeclarations decls;
-  for (int i = 0; i < file_->dependency_count(); i++) {
-    FileGenerator dependency(file_->dependency(i), options_);
-    dependency.FillForwardDeclarations(&decls);
-  }
   FillForwardDeclarations(&decls);
-  decls.Print(printer, options_);
+  decls.PrintForwardDeclarations(printer, options_);
 }
 
 void FileGenerator::FillForwardDeclarations(ForwardDeclarations* decls) {
-  for (int i = 0; i < file_->public_dependency_count(); i++) {
-    FileGenerator dependency(file_->public_dependency(i), options_);
-    dependency.FillForwardDeclarations(decls);
-  }
   for (int i = 0; i < package_parts_.size(); i++) {
     decls = decls->AddOrGetNamespace(package_parts_[i]);
   }
@@ -812,8 +1133,8 @@ void FileGenerator::GenerateTopHeaderGuard(io::Printer* printer,
       "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
       "// source: $filename$\n"
       "\n"
-      "#ifndef PROTOBUF_$filename_identifier$__INCLUDED\n"
-      "#define PROTOBUF_$filename_identifier$__INCLUDED\n"
+      "#ifndef PROTOBUF_INCLUDED_$filename_identifier$\n"
+      "#define PROTOBUF_INCLUDED_$filename_identifier$\n"
       "\n"
       "#include <string>\n",
       "filename", file_->name(), "filename_identifier", filename_identifier);
@@ -823,11 +1144,14 @@ void FileGenerator::GenerateTopHeaderGuard(io::Printer* printer,
 void FileGenerator::GenerateBottomHeaderGuard(
     io::Printer* printer, const string& filename_identifier) {
   printer->Print(
-    "#endif  // PROTOBUF_$filename_identifier$__INCLUDED\n",
+    "#endif  // PROTOBUF_INCLUDED_$filename_identifier$\n",
     "filename_identifier", filename_identifier);
 }
 
 void FileGenerator::GenerateLibraryIncludes(io::Printer* printer) {
+  if (UsingImplicitWeakFields(file_, options_)) {
+    printer->Print("#include <google/protobuf/implicit_weak_message.h>\n");
+  }
 
   printer->Print(
     "#include <google/protobuf/stubs/common.h>\n"
@@ -856,8 +1180,18 @@ void FileGenerator::GenerateLibraryIncludes(io::Printer* printer) {
       "#include <google/protobuf/io/coded_stream.h>\n"
       "#include <google/protobuf/arena.h>\n"
       "#include <google/protobuf/arenastring.h>\n"
+      "#include <google/protobuf/generated_message_table_driven.h>\n"
       "#include <google/protobuf/generated_message_util.h>\n"
+      "#include <google/protobuf/inlined_string_field.h>\n");
+
+
+  if (HasDescriptorMethods(file_, options_)) {
+    printer->Print(
       "#include <google/protobuf/metadata.h>\n");
+  } else {
+    printer->Print(
+      "#include <google/protobuf/metadata_lite.h>\n");
+  }
 
   if (!message_generators_.empty()) {
     if (HasDescriptorMethods(file_, options_)) {
@@ -875,13 +1209,14 @@ void FileGenerator::GenerateLibraryIncludes(io::Printer* printer) {
     "  // IWYU pragma: export\n");
   if (HasMapFields(file_)) {
     printer->Print(
-        "#include <google/protobuf/map.h>\n");
+        "#include <google/protobuf/map.h>"
+        "  // IWYU pragma: export\n");
     if (HasDescriptorMethods(file_, options_)) {
-      printer->Print(
-          "#include <google/protobuf/map_field_inl.h>\n");
+      printer->Print("#include <google/protobuf/map_entry.h>\n");
+      printer->Print("#include <google/protobuf/map_field_inl.h>\n");
     } else {
-      printer->Print(
-          "#include <google/protobuf/map_field_lite.h>\n");
+      printer->Print("#include <google/protobuf/map_entry_lite.h>\n");
+      printer->Print("#include <google/protobuf/map_field_lite.h>\n");
     }
   }
 
@@ -935,11 +1270,12 @@ void FileGenerator::GenerateDependencyIncludes(io::Printer* printer) {
     const bool use_system_include = IsWellKnownMessage(file_->dependency(i));
     const string& name = file_->dependency(i)->name();
     bool public_import = (public_import_names.count(name) != 0);
+    string basename = StripProto(name);
 
 
     printer->Print(
       "#include $left$$dependency$.pb.h$right$$iwyu$\n",
-      "dependency", StripProto(name),
+      "dependency", basename,
       "iwyu", (public_import) ? "  // IWYU pragma: export" : "",
       "left", use_system_include ? "<" : "\"",
       "right", use_system_include ? ">" : "\"");
@@ -948,26 +1284,34 @@ void FileGenerator::GenerateDependencyIncludes(io::Printer* printer) {
 
 void FileGenerator::GenerateGlobalStateFunctionDeclarations(
     io::Printer* printer) {
-  // Forward-declare the AddDescriptors, AssignDescriptors, and ShutdownFile
-  // functions, so that we can declare them to be friends of each class.
+// Forward-declare the AddDescriptors, InitDefaults because these are called
+// by .pb.cc files depending on this file.
   printer->Print(
       "\n"
       "namespace $file_namespace$ {\n"
-      "// Internal implementation detail -- do not call these.\n"
+      "// Internal implementation detail -- do not use these members.\n"
       "struct $dllexport_decl$TableStruct {\n"
+      // These tables describe how to serialize and parse messages. Used
+      // for table driven code.
+      "  static const ::google::protobuf::internal::ParseTableField entries[];\n"
+      "  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];\n"
+      "  static const ::google::protobuf::internal::ParseTable schema[$num$];\n"
+      "  static const ::google::protobuf::internal::FieldMetadata field_metadata[];\n"
+      "  static const ::google::protobuf::internal::SerializationTable "
+      "serialization_table[];\n"
       "  static const ::google::protobuf::uint32 offsets[];\n"
-      // The following function(s) need to be able to access private members of
-      // the messages defined in the file. So we make them static members.
-      // This is the internal implementation of InitDefaults. It should only
-      // be called by InitDefaults which makes sure it will be called only once.
-      "  static void InitDefaultsImpl();\n"
-      "  static void Shutdown();\n"
-      "};\n"
-      "void $dllexport_decl$AddDescriptors();\n"
-      "void $dllexport_decl$InitDefaults();\n"
+      "};\n",
+      "file_namespace", FileLevelNamespace(file_), "dllexport_decl",
+      options_.dllexport_decl.empty() ? "" : options_.dllexport_decl + " ",
+      "num", SimpleItoa(std::max(size_t(1), message_generators_.size())));
+  if (HasDescriptorMethods(file_, options_)) {
+    printer->Print(
+        "void $dllexport_decl$AddDescriptors();\n", "dllexport_decl",
+        options_.dllexport_decl.empty() ? "" : options_.dllexport_decl + " ");
+  }
+  printer->Print(
       "}  // namespace $file_namespace$\n",
-      "file_namespace", FileLevelNamespace(file_->name()), "dllexport_decl",
-      options_.dllexport_decl.empty() ? "" : options_.dllexport_decl + " ");
+      "file_namespace", FileLevelNamespace(file_));
 }
 
 void FileGenerator::GenerateMessageDefinitions(io::Printer* printer) {
@@ -1016,59 +1360,31 @@ void FileGenerator::GenerateExtensionIdentifiers(io::Printer* printer) {
 }
 
 void FileGenerator::GenerateInlineFunctionDefinitions(io::Printer* printer) {
-  // An aside about inline functions in .proto.h mode:
-  //
-  // The PROTOBUF_INLINE_NOT_IN_HEADERS symbol controls conditionally
-  // moving much of the inline functions to the .pb.cc file, which can be a
-  // significant performance benefit for compilation time, at the expense
-  // of non-inline function calls.
-  //
-  // However, in .proto.h mode, the definition of the internal dependent
-  // base class must remain in the header, and can never be out-lined. The
-  // dependent base class also needs access to has-bit manipuation
-  // functions, so the has-bit functions must be unconditionally inlined in
-  // proto_h mode.
-  //
-  // This gives us three flavors of functions:
-  //
-  //  1. Functions on the message not used by the internal dependent base
-  //     class: in .proto.h mode, only some functions are defined on the
-  //     message class; others are defined on the dependent base class.
-  //     These are guarded and can be out-lined. These are generated by
-  //     GenerateInlineMethods, and include has_* bit functions in
-  //     non-proto_h mode.
-  //
-  //  2. Functions on the internal dependent base class: these functions
-  //     are dependent on a template parameter, so they always need to
-  //     remain in the header.
-  //
-  //  3. Functions on the message that are used by the dependent base: the
-  //     dependent base class down casts itself to the message
-  //     implementation class to access these functions (the has_* bit
-  //     manipulation functions). Unlike #1, these functions must
-  //     unconditionally remain in the header. These are emitted by
-  //     GenerateDependentInlineMethods, even though they are not actually
-  //     dependent.
-
-  printer->Print("#if !PROTOBUF_INLINE_NOT_IN_HEADERS\n");
+  // TODO(gerbens) remove pragmas when gcc is no longer used. Current version
+  // of gcc fires a bogus error when compiled with strict-aliasing.
+  printer->Print(
+    "#ifdef __GNUC__\n"
+    "  #pragma GCC diagnostic push\n"
+    "  #pragma GCC diagnostic ignored \"-Wstrict-aliasing\"\n"
+    "#endif  // __GNUC__\n");
   // Generate class inline methods.
   for (int i = 0; i < message_generators_.size(); i++) {
     if (i > 0) {
       printer->Print(kThinSeparator);
       printer->Print("\n");
     }
-    message_generators_[i]->GenerateInlineMethods(printer,
-                                                  /* is_inline = */ true);
+    message_generators_[i]->GenerateInlineMethods(printer);
   }
-  printer->Print("#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS\n");
+  printer->Print(
+    "#ifdef __GNUC__\n"
+    "  #pragma GCC diagnostic pop\n"
+    "#endif  // __GNUC__\n");
 
   for (int i = 0; i < message_generators_.size(); i++) {
     if (i > 0) {
       printer->Print(kThinSeparator);
       printer->Print("\n");
     }
-    // Methods of the dependent base class must always be inline in the header.
-    message_generators_[i]->GenerateDependentInlineMethods(printer);
   }
 }
 
@@ -1076,13 +1392,8 @@ void FileGenerator::GenerateProto2NamespaceEnumSpecializations(
     io::Printer* printer) {
   // Emit GetEnumDescriptor specializations into google::protobuf namespace:
   if (HasEnumDefinitions(file_)) {
-    // The SWIG conditional is to avoid a null-pointer dereference
-    // (bug 1984964) in swig-1.3.21 resulting from the following syntax:
-    //   namespace X { void Y<Z::W>(); }
-    // which appears in GetEnumDescriptor() specializations.
     printer->Print(
         "\n"
-        "#ifndef SWIG\n"
         "namespace google {\nnamespace protobuf {\n"
         "\n");
     for (int i = 0; i < enum_generators_.size(); i++) {
@@ -1090,8 +1401,7 @@ void FileGenerator::GenerateProto2NamespaceEnumSpecializations(
     }
     printer->Print(
         "\n"
-        "}  // namespace protobuf\n}  // namespace google\n"
-        "#endif  // SWIG\n");
+        "}  // namespace protobuf\n}  // namespace google\n");
   }
 }
 
diff --git a/src/google/protobuf/compiler/cpp/cpp_file.h b/src/google/protobuf/compiler/cpp/cpp_file.h
index 25d6eabf..94da9a14 100644
--- a/src/google/protobuf/compiler/cpp/cpp_file.h
+++ b/src/google/protobuf/compiler/cpp/cpp_file.h
@@ -35,14 +35,14 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__
 #define GOOGLE_PROTOBUF_COMPILER_CPP_FILE_H__
 
+#include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
+#include <set>
 #include <string>
 #include <vector>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/compiler/cpp/cpp_field.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_options.h>
 
 namespace google {
@@ -81,16 +81,21 @@ class FileGenerator {
                         const string& info_path);
   void GenerateSource(io::Printer* printer);
 
+  int NumMessages() const { return message_generators_.size(); }
+  // Similar to GenerateSource but generates only one message
+  void GenerateSourceForMessage(int idx, io::Printer* printer);
+  void GenerateGlobalSource(io::Printer* printer);
+
  private:
   // Internal type used by GenerateForwardDeclarations (defined in file.cc).
   class ForwardDeclarations;
 
-  // Generate the BuildDescriptors() procedure, which builds all descriptors
-  // for types defined in the file.
-  void GenerateBuildDescriptors(io::Printer* printer);
+  void GenerateSourceIncludes(io::Printer* printer);
+  void GenerateSourceDefaultInstance(int idx, io::Printer* printer);
 
-  void GenerateNamespaceOpeners(io::Printer* printer);
-  void GenerateNamespaceClosers(io::Printer* printer);
+  void GenerateInitForSCC(const SCC* scc, io::Printer* printer);
+  void GenerateTables(io::Printer* printer);
+  void GenerateReflectionInitializationCode(io::Printer* printer);
 
   // For other imports, generates their forward-declarations.
   void GenerateForwardDeclarations(io::Printer* printer);
@@ -133,9 +138,32 @@ class FileGenerator {
 
   void GenerateProto2NamespaceEnumSpecializations(io::Printer* printer);
 
+  // Sometimes the names we use in a .proto file happen to be defined as macros
+  // on some platforms (e.g., macro/minor used in plugin.proto are defined as
+  // macros in sys/types.h on FreeBSD and a few other platforms). To make the
+  // generated code compile on these platforms, we either have to undef the
+  // macro for these few platforms, or rename the field name for all platforms.
+  // Since these names are part of protobuf public API, renaming is generally
+  // a breaking change so we prefer the #undef approach.
+  void GenerateMacroUndefs(io::Printer* printer);
+
+  bool IsSCCRepresentative(const Descriptor* d) {
+    return GetSCCRepresentative(d) == d;
+  }
+  const Descriptor* GetSCCRepresentative(const Descriptor* d) {
+    return GetSCC(d)->GetRepresentative();
+  }
+  const SCC* GetSCC(const Descriptor* d) {
+    return scc_analyzer_.GetSCC(d);
+  }
+
+
   const FileDescriptor* file_;
   const Options options_;
 
+  SCCAnalyzer scc_analyzer_;
+
+
   // Contains the post-order walk of all the messages (and child messages) in
   // this file. If you need a pre-order walk just reverse iterate.
   std::vector<MessageGenerator*> message_generators_;
@@ -143,14 +171,12 @@ class FileGenerator {
   std::vector<ServiceGenerator*> service_generators_;
   std::vector<ExtensionGenerator*> extension_generators_;
 
-  // These members are just for owning (and thus proper deleting). Some of the
-  // message_ and enum_generators above are owned by child messages.
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<MessageGenerator> >
-      message_generators_owner_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<EnumGenerator> > enum_generators_owner_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ServiceGenerator> >
+  // These members are just for owning (and thus proper deleting).
+  // Nested (enum/extension)_generators are owned by child messages.
+  std::unique_ptr<std::unique_ptr<EnumGenerator> []> enum_generators_owner_;
+  std::unique_ptr<std::unique_ptr<ServiceGenerator> []>
       service_generators_owner_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ExtensionGenerator> >
+  std::unique_ptr<std::unique_ptr<ExtensionGenerator> []>
       extension_generators_owner_;
 
   // E.g. if the package is foo.bar, package_parts_ is {"foo", "bar"}.
diff --git a/src/google/protobuf/compiler/cpp/cpp_generator.cc b/src/google/protobuf/compiler/cpp/cpp_generator.cc
index 648ab28a..20bb8a1a 100644
--- a/src/google/protobuf/compiler/cpp/cpp_generator.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_generator.cc
@@ -36,16 +36,15 @@
 
 #include <vector>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <utility>
 
+#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/compiler/cpp/cpp_file.h>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
+
 
 namespace google {
 namespace protobuf {
@@ -65,12 +64,6 @@ bool CppGenerator::Generate(const FileDescriptor* file,
   // -----------------------------------------------------------------
   // parse generator options
 
-  // TODO(kenton):  If we ever have more options, we may want to create a
-  //   class that encapsulates them which we can pass down to all the
-  //   generator classes.  Currently we pass dllexport_decl down to all of
-  //   them via the constructors, but we don't want to have to add another
-  //   constructor parameter for every option.
-
   // If the dllexport_decl option is passed to the compiler, we need to write
   // it in front of every symbol that should be exported if this .proto is
   // compiled into a Windows DLL.  E.g., if the user invokes the protocol
@@ -84,7 +77,6 @@ bool CppGenerator::Generate(const FileDescriptor* file,
   // __declspec(dllimport) depending on what is being compiled.
   //
   Options file_options;
-
   for (int i = 0; i < options.size(); i++) {
     if (options[i].first == "dllexport_decl") {
       file_options.dllexport_decl = options[i].second;
@@ -98,22 +90,41 @@ bool CppGenerator::Generate(const FileDescriptor* file,
       file_options.annotation_guard_name = options[i].second;
     } else if (options[i].first == "lite") {
       file_options.enforce_lite = true;
+    } else if (options[i].first == "lite_implicit_weak_fields") {
+      file_options.lite_implicit_weak_fields = true;
+      if (!options[i].second.empty()) {
+        file_options.num_cc_files = strto32(options[i].second.c_str(),
+                                            NULL, 10);
+      }
+    } else if (options[i].first == "table_driven_parsing") {
+      file_options.table_driven_parsing = true;
+    } else if (options[i].first == "table_driven_serialization") {
+      file_options.table_driven_serialization = true;
     } else {
       *error = "Unknown generator option: " + options[i].first;
       return false;
     }
   }
 
+  // The safe_boundary_check option controls behavior for Google-internal
+  // protobuf APIs.
+  if (file_options.safe_boundary_check) {
+    *error =
+        "The safe_boundary_check option is not supported outside of Google.";
+    return false;
+  }
+
   // -----------------------------------------------------------------
 
 
   string basename = StripProto(file->name());
 
+
   FileGenerator file_generator(file, file_options);
 
   // Generate header(s).
   if (file_options.proto_h) {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         generator_context->Open(basename + ".proto.h"));
     GeneratedCodeInfo annotations;
     io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
@@ -125,36 +136,64 @@ bool CppGenerator::Generate(const FileDescriptor* file,
     file_generator.GenerateProtoHeader(
         &printer, file_options.annotate_headers ? info_path : "");
     if (file_options.annotate_headers) {
-      google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> info_output(
+      std::unique_ptr<io::ZeroCopyOutputStream> info_output(
           generator_context->Open(info_path));
       annotations.SerializeToZeroCopyStream(info_output.get());
     }
   }
 
-  basename.append(".pb");
   {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
-        generator_context->Open(basename + ".h"));
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
+        generator_context->Open(basename + ".pb.h"));
     GeneratedCodeInfo annotations;
     io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
         &annotations);
-    string info_path = basename + ".h.meta";
+    string info_path = basename + ".pb.h.meta";
     io::Printer printer(output.get(), '$', file_options.annotate_headers
                                                ? &annotation_collector
                                                : NULL);
     file_generator.GeneratePBHeader(
         &printer, file_options.annotate_headers ? info_path : "");
     if (file_options.annotate_headers) {
-      google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> info_output(
+      std::unique_ptr<io::ZeroCopyOutputStream> info_output(
           generator_context->Open(info_path));
       annotations.SerializeToZeroCopyStream(info_output.get());
     }
   }
 
-  // Generate cc file.
-  {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
-        generator_context->Open(basename + ".cc"));
+  // Generate cc file(s).
+  if (UsingImplicitWeakFields(file, file_options)) {
+    {
+      // This is the global .cc file, containing enum/services/tables/reflection
+      std::unique_ptr<io::ZeroCopyOutputStream> output(
+          generator_context->Open(basename + ".pb.cc"));
+      io::Printer printer(output.get(), '$');
+      file_generator.GenerateGlobalSource(&printer);
+    }
+
+    int num_cc_files = file_generator.NumMessages();
+
+    // If we're using implicit weak fields then we allow the user to optionally
+    // specify how many files to generate, not counting the global pb.cc file.
+    // If we have more files than messages, then some files will be generated as
+    // empty placeholders.
+    if (file_options.num_cc_files > 0) {
+      GOOGLE_CHECK_LE(file_generator.NumMessages(), file_options.num_cc_files)
+          << "There must be at least as many numbered .cc files as messages.";
+      num_cc_files = file_options.num_cc_files;
+    }
+    for (int i = 0; i < num_cc_files; i++) {
+      // TODO(gerbens) Agree on naming scheme.
+      std::unique_ptr<io::ZeroCopyOutputStream> output(
+          generator_context->Open(basename + "." + SimpleItoa(i) + ".cc"));
+      io::Printer printer(output.get(), '$');
+      if (i < file_generator.NumMessages()) {
+        file_generator.GenerateSourceForMessage(i, &printer);
+      }
+    }
+  } else {
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
+        generator_context->Open(basename + ".pb.cc"));
     io::Printer printer(output.get(), '$');
     file_generator.GenerateSource(&printer);
   }
diff --git a/src/google/protobuf/compiler/cpp/cpp_helpers.cc b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
index 3c4dddc5..163dac0a 100644
--- a/src/google/protobuf/compiler/cpp/cpp_helpers.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
@@ -32,19 +32,23 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
+#include <google/protobuf/stubs/hash.h>
 #include <limits>
 #include <map>
+#include <queue>
 #include <vector>
-#include <google/protobuf/stubs/hash.h>
 
-#include <google/protobuf/compiler/cpp/cpp_helpers.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 
 
+
+
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -70,7 +74,7 @@ const char* const kKeywordList[] = {
   "constexpr", "const_cast", "continue", "decltype", "default", "delete", "do",
   "double", "dynamic_cast", "else", "enum", "explicit", "export", "extern",
   "false", "float", "for", "friend", "goto", "if", "inline", "int", "long",
-  "mutable", "namespace", "new", "noexcept", "not", "not_eq", "NULL",
+  "mutable", "namespace", "new", "noexcept", "not", "not_eq", "nullptr",
   "operator", "or", "or_eq", "private", "protected", "public", "register",
   "reinterpret_cast", "return", "short", "signed", "sizeof", "static",
   "static_assert", "static_cast", "struct", "switch", "template", "this",
@@ -103,6 +107,30 @@ bool HasExtension(const Descriptor* descriptor) {
   return false;
 }
 
+// Encode [0..63] as 'A'-'Z', 'a'-'z', '0'-'9', '_'
+char Base63Char(int value) {
+  GOOGLE_CHECK_GE(value, 0);
+  if (value < 26) return 'A' + value;
+  value -= 26;
+  if (value < 26) return 'a' + value;
+  value -= 26;
+  if (value < 10) return '0' + value;
+  GOOGLE_CHECK_EQ(value, 10);
+  return '_';
+}
+
+// Given a c identifier has 63 legal characters we can't implement base64
+// encoding. So we return the k least significant "digits" in base 63.
+template <typename I>
+string Base63(I n, int k) {
+  string res;
+  while (k-- > 0) {
+    res += Base63Char(static_cast<int>(n % 63));
+    n /= 63;
+  }
+  return res;
+}
+
 }  // namespace
 
 string UnderscoresToCamelCase(const string& input, bool cap_next_letter) {
@@ -135,41 +163,61 @@ const char kThickSeparator[] =
 const char kThinSeparator[] =
   "// -------------------------------------------------------------------\n";
 
-string ClassName(const Descriptor* descriptor, bool qualified) {
-
-  // Find "outer", the descriptor of the top-level message in which
-  // "descriptor" is embedded.
-  const Descriptor* outer = descriptor;
-  while (outer->containing_type() != NULL) outer = outer->containing_type();
-
-  const string& outer_name = outer->full_name();
-  string inner_name = descriptor->full_name().substr(outer_name.size());
-
-  if (qualified) {
-    return "::" + DotsToColons(outer_name) + DotsToUnderscores(inner_name);
-  } else {
-    return outer->name() + DotsToUnderscores(inner_name);
+bool CanInitializeByZeroing(const FieldDescriptor* field) {
+  if (field->is_repeated() || field->is_extension()) return false;
+  switch (field->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_ENUM:
+      return field->default_value_enum()->number() == 0;
+    case FieldDescriptor::CPPTYPE_INT32:
+      return field->default_value_int32() == 0;
+    case FieldDescriptor::CPPTYPE_INT64:
+      return field->default_value_int64() == 0;
+    case FieldDescriptor::CPPTYPE_UINT32:
+      return field->default_value_uint32() == 0;
+    case FieldDescriptor::CPPTYPE_UINT64:
+      return field->default_value_uint64() == 0;
+    case FieldDescriptor::CPPTYPE_FLOAT:
+      return field->default_value_float() == 0;
+    case FieldDescriptor::CPPTYPE_DOUBLE:
+      return field->default_value_double() == 0;
+    case FieldDescriptor::CPPTYPE_BOOL:
+      return field->default_value_bool() == false;
+    default:
+      return false;
   }
 }
 
-string ClassName(const EnumDescriptor* enum_descriptor, bool qualified) {
+string ClassName(const Descriptor* descriptor) {
+  const Descriptor* parent = descriptor->containing_type();
+  string res;
+  if (parent) res += ClassName(parent) + "_";
+  res += descriptor->name();
+  if (IsMapEntryMessage(descriptor)) res += "_DoNotUse";
+  return res;
+}
+
+string ClassName(const EnumDescriptor* enum_descriptor) {
   if (enum_descriptor->containing_type() == NULL) {
-    if (qualified) {
-      return "::" + DotsToColons(enum_descriptor->full_name());
-    } else {
-      return enum_descriptor->name();
-    }
+    return enum_descriptor->name();
   } else {
-    string result = ClassName(enum_descriptor->containing_type(), qualified);
-    result += '_';
-    result += enum_descriptor->name();
-    return result;
+    return ClassName(enum_descriptor->containing_type()) + "_" +
+           enum_descriptor->name();
   }
 }
 
+string Namespace(const string& package) {
+  if (package.empty()) return "";
+  return "::" + DotsToColons(package);
+}
+
+string DefaultInstanceName(const Descriptor* descriptor) {
+  string prefix = descriptor->file()->package().empty() ? "" : "::";
+  return prefix + DotsToColons(descriptor->file()->package()) + "::_" +
+      ClassName(descriptor, false) + "_default_instance_";
+}
 
-string DependentBaseClassTemplateName(const Descriptor* descriptor) {
-  return ClassName(descriptor, false) + "_InternalBase";
+string ReferenceFunctionName(const Descriptor* descriptor) {
+  return QualifiedClassName(descriptor) + "_ReferenceStrong";
 }
 
 string SuperClassName(const Descriptor* descriptor, const Options& options) {
@@ -178,14 +226,6 @@ string SuperClassName(const Descriptor* descriptor, const Options& options) {
              : "::google::protobuf::MessageLite";
 }
 
-string DependentBaseDownCast() {
-  return "reinterpret_cast<T*>(this)->";
-}
-
-string DependentBaseConstDownCast() {
-  return "reinterpret_cast<const T*>(this)->";
-}
-
 string FieldName(const FieldDescriptor* field) {
   string result = field->name();
   LowerString(&result);
@@ -203,6 +243,30 @@ string EnumValueName(const EnumValueDescriptor* enum_value) {
   return result;
 }
 
+int EstimateAlignmentSize(const FieldDescriptor* field) {
+  if (field == NULL) return 0;
+  if (field->is_repeated()) return 8;
+  switch (field->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_BOOL:
+      return 1;
+
+    case FieldDescriptor::CPPTYPE_INT32:
+    case FieldDescriptor::CPPTYPE_UINT32:
+    case FieldDescriptor::CPPTYPE_ENUM:
+    case FieldDescriptor::CPPTYPE_FLOAT:
+      return 4;
+
+    case FieldDescriptor::CPPTYPE_INT64:
+    case FieldDescriptor::CPPTYPE_UINT64:
+    case FieldDescriptor::CPPTYPE_DOUBLE:
+    case FieldDescriptor::CPPTYPE_STRING:
+    case FieldDescriptor::CPPTYPE_MESSAGE:
+      return 8;
+  }
+  GOOGLE_LOG(FATAL) << "Can't get here.";
+  return -1;  // Make compiler happy.
+}
+
 string FieldConstantName(const FieldDescriptor *field) {
   string field_name = UnderscoresToCamelCase(field->name(), true);
   string result = "k" + field_name + "FieldNumber";
@@ -219,60 +283,6 @@ string FieldConstantName(const FieldDescriptor *field) {
   return result;
 }
 
-bool IsFieldDependent(const FieldDescriptor* field) {
-  if (field->containing_oneof() != NULL &&
-      field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
-    return true;
-  }
-  if (field->is_map()) {
-    const Descriptor* map_descriptor = field->message_type();
-    for (int i = 0; i < map_descriptor->field_count(); i++) {
-      if (IsFieldDependent(map_descriptor->field(i))) {
-        return true;
-      }
-    }
-    return false;
-  }
-  if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) {
-    return false;
-  }
-  if (field->containing_oneof() != NULL) {
-    // Oneof fields will always be dependent.
-    //
-    // This is a unique case for field codegen. Field generators are
-    // responsible for generating all the field-specific accessor
-    // functions, except for the clear_*() function; instead, field
-    // generators produce inline clearing code.
-    //
-    // For non-oneof fields, the Message class uses the inline clearing
-    // code to define the field's clear_*() function, as well as in the
-    // destructor. For oneof fields, the Message class generates a much
-    // more complicated clear_*() function, which clears only the oneof
-    // member that is set, in addition to clearing methods for each of the
-    // oneof members individually.
-    //
-    // Since oneofs do not have their own generator class, the Message code
-    // generation logic would be significantly complicated in order to
-    // split dependent and non-dependent manipulation logic based on
-    // whether the oneof truly needs to be dependent; so, for oneof fields,
-    // we just assume it (and its constituents) should be manipulated by a
-    // dependent base class function.
-    //
-    // This is less precise than how dependent message-typed fields are
-    // handled, but the cost is limited to only the generated code for the
-    // oneof field, which seems like an acceptable tradeoff.
-    return true;
-  }
-  if (field->file() == field->message_type()->file()) {
-    return false;
-  }
-  return true;
-}
-
-string DependentTypeName(const FieldDescriptor* field) {
-  return "InternalBase_" + field->name() + "_T";
-}
-
 string FieldMessageTypeName(const FieldDescriptor* field) {
   // Note:  The Google-internal version of Protocol Buffers uses this function
   //   as a hook point for hacks to support legacy code.
@@ -477,19 +487,6 @@ string SafeFunctionName(const Descriptor* descriptor,
   return function_name;
 }
 
-bool StaticInitializersForced(const FileDescriptor* file,
-                              const Options& options) {
-  if (HasDescriptorMethods(file, options) || file->extension_count() > 0) {
-    return true;
-  }
-  for (int i = 0; i < file->message_type_count(); ++i) {
-    if (HasExtension(file->message_type(i))) {
-      return true;
-    }
-  }
-  return false;
-}
-
 
 static bool HasMapFields(const Descriptor* descriptor) {
   for (int i = 0; i < descriptor->field_count(); ++i) {
@@ -654,6 +651,216 @@ void GenerateUtf8CheckCodeForCord(const FieldDescriptor* field,
                         "VerifyUtf8Cord", "VerifyUTF8CordNamedField", printer);
 }
 
+namespace {
+
+void Flatten(const Descriptor* descriptor,
+             std::vector<const Descriptor*>* flatten) {
+  for (int i = 0; i < descriptor->nested_type_count(); i++)
+    Flatten(descriptor->nested_type(i), flatten);
+  flatten->push_back(descriptor);
+}
+
+}  // namespace
+
+void FlattenMessagesInFile(const FileDescriptor* file,
+                           std::vector<const Descriptor*>* result) {
+  for (int i = 0; i < file->message_type_count(); i++) {
+    Flatten(file->message_type(i), result);
+  }
+}
+
+bool HasWeakFields(const Descriptor* descriptor) {
+  return false;
+}
+
+bool HasWeakFields(const FileDescriptor* file) {
+  return false;
+}
+
+bool UsingImplicitWeakFields(const FileDescriptor* file,
+                             const Options& options) {
+  return options.lite_implicit_weak_fields &&
+         GetOptimizeFor(file, options) == FileOptions::LITE_RUNTIME;
+}
+
+bool IsImplicitWeakField(const FieldDescriptor* field, const Options& options,
+                         SCCAnalyzer* scc_analyzer) {
+  return UsingImplicitWeakFields(field->file(), options) &&
+         field->type() == FieldDescriptor::TYPE_MESSAGE &&
+         !field->is_required() && !field->is_map() &&
+         field->containing_oneof() == NULL &&
+         !IsWellKnownMessage(field->message_type()->file()) &&
+         // We do not support implicit weak fields between messages in the same
+         // strongly-connected component.
+         scc_analyzer->GetSCC(field->containing_type()) !=
+             scc_analyzer->GetSCC(field->message_type());
+}
+
+struct CompareDescriptors {
+  bool operator()(const Descriptor* a, const Descriptor* b) {
+    return a->full_name() < b->full_name();
+  }
+};
+
+SCCAnalyzer::NodeData SCCAnalyzer::DFS(const Descriptor* descriptor) {
+  // Must not have visited already.
+  GOOGLE_DCHECK_EQ(cache_.count(descriptor), 0);
+
+  // Mark visited by inserting in map.
+  NodeData& result = cache_[descriptor];
+  // Initialize data structures.
+  result.index = result.lowlink = index_++;
+  stack_.push_back(descriptor);
+
+  // Recurse the fields / nodes in graph
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    const Descriptor* child = descriptor->field(i)->message_type();
+    if (child) {
+      if (cache_.count(child) == 0) {
+        // unexplored node
+        NodeData child_data = DFS(child);
+        result.lowlink = std::min(result.lowlink, child_data.lowlink);
+      } else {
+        NodeData child_data = cache_[child];
+        if (child_data.scc == NULL) {
+          // Still in the stack_ so we found a back edge
+          result.lowlink = std::min(result.lowlink, child_data.index);
+        }
+      }
+    }
+  }
+  if (result.index == result.lowlink) {
+    // This is the root of a strongly connected component
+    SCC* scc = CreateSCC();
+    while (true) {
+      const Descriptor* scc_desc = stack_.back();
+      scc->descriptors.push_back(scc_desc);
+      // Remove from stack
+      stack_.pop_back();
+      cache_[scc_desc].scc = scc;
+
+      if (scc_desc == descriptor) break;
+    }
+
+    // The order of descriptors is random and depends how this SCC was
+    // discovered. In-order to ensure maximum stability we sort it by name.
+    std::sort(scc->descriptors.begin(), scc->descriptors.end(),
+              CompareDescriptors());
+    AddChildren(scc);
+  }
+  return result;
+}
+
+void SCCAnalyzer::AddChildren(SCC* scc) {
+  std::set<const SCC*> seen;
+  for (int i = 0; i < scc->descriptors.size(); i++) {
+    const Descriptor* descriptor = scc->descriptors[i];
+    for (int j = 0; j < descriptor->field_count(); j++) {
+      const Descriptor* child_msg = descriptor->field(j)->message_type();
+      if (child_msg) {
+        const SCC* child = GetSCC(child_msg);
+        if (child == scc) continue;
+        if (seen.insert(child).second) {
+          scc->children.push_back(child);
+        }
+      }
+    }
+  }
+}
+
+MessageAnalysis SCCAnalyzer::GetSCCAnalysis(const SCC* scc) {
+  if (analysis_cache_.count(scc)) return analysis_cache_[scc];
+  MessageAnalysis result = MessageAnalysis();
+  for (int i = 0; i < scc->descriptors.size(); i++) {
+    const Descriptor* descriptor = scc->descriptors[i];
+    if (descriptor->extension_range_count() > 0) {
+      result.contains_extension = true;
+    }
+    for (int i = 0; i < descriptor->field_count(); i++) {
+      const FieldDescriptor* field = descriptor->field(i);
+      if (field->is_required()) {
+        result.contains_required = true;
+      }
+      switch (field->type()) {
+        case FieldDescriptor::TYPE_STRING:
+        case FieldDescriptor::TYPE_BYTES: {
+          if (field->options().ctype() == FieldOptions::CORD) {
+            result.contains_cord = true;
+          }
+          break;
+        }
+        case FieldDescriptor::TYPE_GROUP:
+        case FieldDescriptor::TYPE_MESSAGE: {
+          const SCC* child = GetSCC(field->message_type());
+          if (child != scc) {
+            MessageAnalysis analysis = GetSCCAnalysis(child);
+            result.contains_cord |= analysis.contains_cord;
+            result.contains_extension |= analysis.contains_extension;
+            if (!ShouldIgnoreRequiredFieldCheck(field, options_)) {
+              result.contains_required |= analysis.contains_required;
+            }
+          } else {
+            // This field points back into the same SCC hence the messages
+            // in the SCC are recursive. Note if SCC contains more than two
+            // nodes it has to be recursive, however this test also works for
+            // a single node that is recursive.
+            result.is_recursive = true;
+          }
+          break;
+        }
+        default:
+          break;
+      }
+    }
+  }
+  // We deliberately only insert the result here. After we contracted the SCC
+  // in the graph, the graph should be a DAG. Hence we shouldn't need to mark
+  // nodes visited as we can never return to them. By inserting them here
+  // we will go in an infinite loop if the SCC is not correct.
+  return analysis_cache_[scc] = result;
+}
+
+void ListAllFields(const Descriptor* d,
+                   std::vector<const FieldDescriptor*>* fields) {
+  // Collect sub messages
+  for (int i = 0; i < d->nested_type_count(); i++) {
+    ListAllFields(d->nested_type(i), fields);
+  }
+  // Collect message level extensions.
+  for (int i = 0; i < d->extension_count(); i++) {
+    fields->push_back(d->extension(i));
+  }
+  // Add types of fields necessary
+  for (int i = 0; i < d->field_count(); i++) {
+    fields->push_back(d->field(i));
+  }
+}
+
+void ListAllFields(const FileDescriptor* d,
+                   std::vector<const FieldDescriptor*>* fields) {
+  // Collect file level message.
+  for (int i = 0; i < d->message_type_count(); i++) {
+    ListAllFields(d->message_type(i), fields);
+  }
+  // Collect message level extensions.
+  for (int i = 0; i < d->extension_count(); i++) {
+    fields->push_back(d->extension(i));
+  }
+}
+
+void ListAllTypesForServices(const FileDescriptor* fd,
+                             std::vector<const Descriptor*>* types) {
+  for (int i = 0; i < fd->service_count(); i++) {
+    const ServiceDescriptor* sd = fd->service(i);
+    for (int j = 0; j < sd->method_count(); j++) {
+      const MethodDescriptor* method = sd->method(j);
+      types->push_back(method->input_type());
+      types->push_back(method->output_type());
+    }
+  }
+}
+
+
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_helpers.h b/src/google/protobuf/compiler/cpp/cpp_helpers.h
index 0f297ec8..eac65124 100644
--- a/src/google/protobuf/compiler/cpp/cpp_helpers.h
+++ b/src/google/protobuf/compiler/cpp/cpp_helpers.h
@@ -38,16 +38,14 @@
 #include <map>
 #include <string>
 #include <google/protobuf/compiler/cpp/cpp_options.h>
+#include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.h>
+#include <google/protobuf/stubs/strutil.h>
 
 namespace google {
 namespace protobuf {
-
-namespace io {
-class Printer;
-}
-
 namespace compiler {
 namespace cpp {
 
@@ -56,6 +54,32 @@ namespace cpp {
 extern const char kThickSeparator[];
 extern const char kThinSeparator[];
 
+
+// Name space of the proto file. This namespace is such that the string
+// "<namespace>::some_name" is the correct fully qualified namespace.
+// This means if the package is empty the namespace is "", and otherwise
+// the namespace is "::foo::bar::...::baz" without trailing semi-colons.
+string Namespace(const string& package);
+inline string Namespace(const FileDescriptor* d) {
+  return Namespace(d->package());
+}
+template <typename Desc>
+string Namespace(const Desc* d) {
+  return Namespace(d->file());
+}
+
+// Returns true if it's safe to reset "field" to zero.
+bool CanInitializeByZeroing(const FieldDescriptor* field);
+
+string ClassName(const Descriptor* descriptor);
+string ClassName(const EnumDescriptor* enum_descriptor);
+template <typename Desc>
+string QualifiedClassName(const Desc* d) {
+  return Namespace(d) + "::" + ClassName(d);
+}
+
+// DEPRECATED just use ClassName or QualifiedClassName, a boolean is very
+// unreadable at the callsite.
 // Returns the non-nested type name for the given type.  If "qualified" is
 // true, prefix the type with the full namespace.  For example, if you had:
 //   package foo.bar;
@@ -64,21 +88,24 @@ extern const char kThinSeparator[];
 //   ::foo::bar::Baz_Qux
 // While the non-qualified version would be:
 //   Baz_Qux
-string ClassName(const Descriptor* descriptor, bool qualified);
-string ClassName(const EnumDescriptor* enum_descriptor, bool qualified);
+inline string ClassName(const Descriptor* descriptor, bool qualified) {
+  return qualified ? QualifiedClassName(descriptor) : ClassName(descriptor);
+}
 
-// Name of the CRTP class template (for use with proto_h).
-// This is a class name, like "ProtoName_InternalBase".
-string DependentBaseClassTemplateName(const Descriptor* descriptor);
+inline string ClassName(const EnumDescriptor* descriptor, bool qualified) {
+  return qualified ? QualifiedClassName(descriptor) : ClassName(descriptor);
+}
 
-// Name of the base class: either the dependent base class (for use with
-// proto_h) or google::protobuf::Message.
-string SuperClassName(const Descriptor* descriptor, const Options& options);
+// Fully qualified name of the default_instance of this message.
+string DefaultInstanceName(const Descriptor* descriptor);
 
-// Returns a string that down-casts from the dependent base class to the
-// derived class.
-string DependentBaseDownCast();
-string DependentBaseConstDownCast();
+// Returns the name of a no-op function that we can call to introduce a linker
+// dependency on the given message type. This is used to implement implicit weak
+// fields.
+string ReferenceFunctionName(const Descriptor* descriptor);
+
+// Name of the base class: google::protobuf::Message or google::protobuf::MessageLite.
+string SuperClassName(const Descriptor* descriptor, const Options& options);
 
 // Get the (unqualified) name that should be used for this field in C++ code.
 // The name is coerced to lower-case to emulate proto1 behavior.  People
@@ -89,6 +116,12 @@ string FieldName(const FieldDescriptor* field);
 // Get the sanitized name that should be used for the given enum in C++ code.
 string EnumValueName(const EnumValueDescriptor* enum_value);
 
+// Returns an estimate of the compiler's alignment for the field.  This
+// can't guarantee to be correct because the generated code could be compiled on
+// different systems with different alignment rules.  The estimates below assume
+// 64-bit pointers.
+int EstimateAlignmentSize(const FieldDescriptor* field);
+
 // Get the unqualified name that should be used for a field's field
 // number constant.
 string FieldConstantName(const FieldDescriptor *field);
@@ -100,20 +133,6 @@ inline const Descriptor* FieldScope(const FieldDescriptor* field) {
     field->extension_scope() : field->containing_type();
 }
 
-// Returns true if the given 'field_descriptor' has a message type that is
-// a dependency of the file where the field is defined (i.e., the field
-// type is defined in a different file than the message holding the field).
-//
-// This only applies to Message-typed fields. Enum-typed fields may refer
-// to an enum in a dependency; however, enums are specified and
-// forward-declared with an enum-base, so the definition is not required to
-// manipulate the field value.
-bool IsFieldDependent(const FieldDescriptor* field_descriptor);
-
-// Returns the name that should be used for forcing dependent lookup from a
-// dependent base class.
-string DependentTypeName(const FieldDescriptor* field);
-
 // Returns the fully-qualified type name field->message_type().  Usually this
 // is just ClassName(field->message_type(), true);
 string FieldMessageTypeName(const FieldDescriptor* field);
@@ -147,6 +166,12 @@ string FilenameIdentifier(const string& filename);
 // For each .proto file generates a unique namespace. In this namespace global
 // definitions are put to prevent collisions.
 string FileLevelNamespace(const string& filename);
+inline string FileLevelNamespace(const FileDescriptor* file) {
+  return FileLevelNamespace(file->name());
+}
+inline string FileLevelNamespace(const Descriptor* d) {
+  return FileLevelNamespace(d->file());
+}
 
 // Return the qualified C++ name for a file level symbol.
 string QualifiedFileLevelSymbol(const string& package, const string& name);
@@ -159,8 +184,18 @@ string SafeFunctionName(const Descriptor* descriptor,
                         const FieldDescriptor* field,
                         const string& prefix);
 
-// Returns true if unknown fields are preseved after parsing.
-inline bool PreserveUnknownFields(const Descriptor* message) {
+// Returns true if unknown fields are always preserved after parsing.
+inline bool AlwaysPreserveUnknownFields(const FileDescriptor* file) {
+  return file->syntax() != FileDescriptor::SYNTAX_PROTO3;
+}
+
+// Returns true if unknown fields are preserved after parsing.
+inline bool AlwaysPreserveUnknownFields(const Descriptor* message) {
+  return AlwaysPreserveUnknownFields(message->file());
+}
+
+// Returns true if generated messages have public unknown fields accessors
+inline bool PublicUnknownFieldsAccessors(const Descriptor* message) {
   return message->file()->syntax() != FileDescriptor::SYNTAX_PROTO3;
 }
 
@@ -168,10 +203,8 @@ inline bool PreserveUnknownFields(const Descriptor* message) {
 ::google::protobuf::FileOptions_OptimizeMode GetOptimizeFor(
     const FileDescriptor* file, const Options& options);
 
-// If PreserveUnknownFields() is true, determines whether unknown
-// fields will be stored in an UnknownFieldSet or a string.
-// If PreserveUnknownFields() is false, this method will not be
-// used.
+// Determines whether unknown fields will be stored in an UnknownFieldSet or
+// a string.
 inline bool UseUnknownFieldSet(const FileDescriptor* file,
                                const Options& options) {
   return GetOptimizeFor(file, options) != FileOptions::LITE_RUNTIME;
@@ -214,10 +247,6 @@ inline bool HasFastArraySerialization(const FileDescriptor* file,
   return GetOptimizeFor(file, options) == FileOptions::SPEED;
 }
 
-// Returns whether we have to generate code with static initializers.
-bool StaticInitializersForced(const FileDescriptor* file,
-                              const Options& options);
-
 
 inline bool IsMapEntryMessage(const Descriptor* descriptor) {
   return descriptor->options().map_entry();
@@ -254,6 +283,20 @@ inline bool SupportsArenas(const FieldDescriptor* field) {
   return SupportsArenas(field->file());
 }
 
+inline bool IsCrossFileMessage(const FieldDescriptor* field) {
+  return field->type() == FieldDescriptor::TYPE_MESSAGE &&
+         field->message_type()->file() != field->file();
+}
+
+inline string MessageCreateFunction(const Descriptor* d) {
+  return SupportsArenas(d) ? "CreateMessage" : "Create";
+}
+
+inline string MakeDefaultName(const FieldDescriptor* field) {
+  return "_i_give_permission_to_break_this_code_default_" + FieldName(field) +
+         "_";
+}
+
 bool IsAnyMessage(const FileDescriptor* descriptor);
 bool IsAnyMessage(const Descriptor* descriptor);
 
@@ -277,6 +320,139 @@ inline ::google::protobuf::FileOptions_OptimizeMode GetOptimizeFor(
       : file->options().optimize_for();
 }
 
+// This orders the messages in a .pb.cc as it's outputted by file.cc
+void FlattenMessagesInFile(const FileDescriptor* file,
+                           std::vector<const Descriptor*>* result);
+inline std::vector<const Descriptor*> FlattenMessagesInFile(
+    const FileDescriptor* file) {
+  std::vector<const Descriptor*> result;
+  FlattenMessagesInFile(file, &result);
+  return result;
+}
+
+bool HasWeakFields(const Descriptor* desc);
+bool HasWeakFields(const FileDescriptor* desc);
+
+// Returns true if the "required" restriction check should be ignored for the
+// given field.
+inline static bool ShouldIgnoreRequiredFieldCheck(const FieldDescriptor* field,
+                                                  const Options& options) {
+  return false;
+}
+
+class LIBPROTOC_EXPORT NamespaceOpener {
+ public:
+  explicit NamespaceOpener(io::Printer* printer) : printer_(printer) {}
+  NamespaceOpener(const string& name, io::Printer* printer)
+      : printer_(printer) {
+    ChangeTo(name);
+  }
+  ~NamespaceOpener() { ChangeTo(""); }
+
+  void ChangeTo(const string& name) {
+    std::vector<string> new_stack_ =
+        Split(name, "::", true);
+    int len = std::min(name_stack_.size(), new_stack_.size());
+    int common_idx = 0;
+    while (common_idx < len) {
+      if (name_stack_[common_idx] != new_stack_[common_idx]) break;
+      common_idx++;
+    }
+    for (int i = name_stack_.size() - 1; i >= common_idx; i--) {
+      printer_->Print("}  // namespace $ns$\n", "ns", name_stack_[i]);
+    }
+    name_stack_.swap(new_stack_);
+    for (int i = common_idx; i < name_stack_.size(); i++) {
+      printer_->Print("namespace $ns$ {\n", "ns", name_stack_[i]);
+    }
+  }
+
+ private:
+  io::Printer* printer_;
+  std::vector<string> name_stack_;
+};
+
+// Description of each strongly connected component. Note that the order
+// of both the descriptors in this SCC and the order of children is
+// deterministic.
+struct SCC {
+  std::vector<const Descriptor*> descriptors;
+  std::vector<const SCC*> children;
+
+  const Descriptor* GetRepresentative() const { return descriptors[0]; }
+};
+
+struct MessageAnalysis {
+  bool is_recursive;
+  bool contains_cord;
+  bool contains_extension;
+  bool contains_required;
+};
+
+// This class is used in FileGenerator, to ensure linear instead of
+// quadratic performance, if we do this per message we would get O(V*(V+E)).
+// Logically this is just only used in message.cc, but in the header for
+// FileGenerator to help share it.
+class LIBPROTOC_EXPORT SCCAnalyzer {
+ public:
+  explicit SCCAnalyzer(const Options& options) : options_(options), index_(0) {}
+  ~SCCAnalyzer() {
+    for (int i = 0; i < garbage_bin_.size(); i++) delete garbage_bin_[i];
+  }
+
+  const SCC* GetSCC(const Descriptor* descriptor) {
+    if (cache_.count(descriptor)) return cache_[descriptor].scc;
+    return DFS(descriptor).scc;
+  }
+
+  MessageAnalysis GetSCCAnalysis(const SCC* scc);
+
+  bool HasRequiredFields(const Descriptor* descriptor) {
+    MessageAnalysis result = GetSCCAnalysis(GetSCC(descriptor));
+    return result.contains_required || result.contains_extension;
+  }
+
+ private:
+  struct NodeData {
+    const SCC* scc;  // if null it means its still on the stack
+    int index;
+    int lowlink;
+  };
+
+  Options options_;
+  std::map<const Descriptor*, NodeData> cache_;
+  std::map<const SCC*, MessageAnalysis> analysis_cache_;
+  std::vector<const Descriptor*> stack_;
+  int index_;
+  std::vector<SCC*> garbage_bin_;
+
+  SCC* CreateSCC() {
+    garbage_bin_.push_back(new SCC());
+    return garbage_bin_.back();
+  }
+
+  // Tarjan's Strongly Connected Components algo
+  NodeData DFS(const Descriptor* descriptor);
+
+  // Add the SCC's that are children of this SCC to its children.
+  void AddChildren(SCC* scc);
+};
+
+void ListAllFields(const Descriptor* d,
+                   std::vector<const FieldDescriptor*>* fields);
+void ListAllFields(const FileDescriptor* d,
+                   std::vector<const FieldDescriptor*>* fields);
+void ListAllTypesForServices(const FileDescriptor* fd,
+                             std::vector<const Descriptor*>* types);
+
+// Indicates whether we should use implicit weak fields for this file.
+bool UsingImplicitWeakFields(const FileDescriptor* file,
+                             const Options& options);
+
+// Indicates whether to treat this field as implicitly weak.
+bool IsImplicitWeakField(const FieldDescriptor* field, const Options& options,
+                         SCCAnalyzer* scc_analyzer);
+
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_map_field.cc b/src/google/protobuf/compiler/cpp/cpp_map_field.cc
index b4eaf485..0e485cac 100644
--- a/src/google/protobuf/compiler/cpp/cpp_map_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_map_field.cc
@@ -32,6 +32,7 @@
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/wire_format.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -103,9 +104,7 @@ void SetMessageVariables(const FieldDescriptor* descriptor,
 
 MapFieldGenerator::MapFieldGenerator(const FieldDescriptor* descriptor,
                                      const Options& options)
-    : FieldGenerator(options),
-      descriptor_(descriptor),
-      dependent_field_(options.proto_h && IsFieldDependent(descriptor)) {
+    : FieldGenerator(options), descriptor_(descriptor) {
   SetMessageVariables(descriptor, &variables_, options);
 }
 
@@ -114,40 +113,36 @@ MapFieldGenerator::~MapFieldGenerator() {}
 void MapFieldGenerator::
 GeneratePrivateMembers(io::Printer* printer) const {
   printer->Print(variables_,
-      "typedef ::google::protobuf::internal::MapEntryLite<\n"
-      "    $key_cpp$, $val_cpp$,\n"
-      "    $key_wire_type$,\n"
-      "    $val_wire_type$,\n"
-      "    $default_enum_value$ >\n"
-      "    $map_classname$;\n"
-      "::google::protobuf::internal::MapField$lite$<\n"
-      "    $key_cpp$, $val_cpp$,\n"
-      "    $key_wire_type$,\n"
-      "    $val_wire_type$,\n"
-      "    $default_enum_value$ > $name$_;\n");
+                 "::google::protobuf::internal::MapField$lite$<\n"
+                 "    $map_classname$,\n"
+                 "    $key_cpp$, $val_cpp$,\n"
+                 "    $key_wire_type$,\n"
+                 "    $val_wire_type$,\n"
+                 "    $default_enum_value$ > $name$_;\n");
 }
 
 void MapFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
-  printer->Print(variables_,
+  printer->Print(
+      variables_,
       "$deprecated_attr$const ::google::protobuf::Map< $key_cpp$, $val_cpp$ >&\n"
-      "    $name$() const;\n"
-      "$deprecated_attr$::google::protobuf::Map< $key_cpp$, $val_cpp$ >*\n"
-      "    mutable_$name$();\n");
+      "    $name$() const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$::google::protobuf::Map< $key_cpp$, $val_cpp$ >*\n"
+                 "    ${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void MapFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline" : "";
-  printer->Print(variables,
-      "$inline$ const ::google::protobuf::Map< $key_cpp$, $val_cpp$ >&\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+      "inline const ::google::protobuf::Map< $key_cpp$, $val_cpp$ >&\n"
       "$classname$::$name$() const {\n"
       "  // @@protoc_insertion_point(field_map:$full_name$)\n"
       "  return $name$_.GetMap();\n"
       "}\n"
-      "$inline$ ::google::protobuf::Map< $key_cpp$, $val_cpp$ >*\n"
+      "inline ::google::protobuf::Map< $key_cpp$, $val_cpp$ >*\n"
       "$classname$::mutable_$name$() {\n"
       "  // @@protoc_insertion_point(field_mutable_map:$full_name$)\n"
       "  return $name$_.MutableMap();\n"
@@ -156,9 +151,7 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
 
 void MapFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  variables["this_message"] = dependent_field_ ? DependentBaseDownCast() : "";
-  printer->Print(variables, "$this_message$$name$_.Clear();\n");
+  printer->Print(variables_, "$name$_.Clear();\n");
 }
 
 void MapFieldGenerator::
@@ -172,17 +165,6 @@ GenerateSwappingCode(io::Printer* printer) const {
 }
 
 void MapFieldGenerator::
-GenerateConstructorCode(io::Printer* printer) const {
-  if (HasDescriptorMethods(descriptor_->file(), options_)) {
-    printer->Print(variables_,
-                   "$name$_.SetAssignDescriptorCallback(\n"
-                   "    $file_namespace$::protobuf_AssignDescriptorsOnce);\n"
-                   "$name$_.SetEntryDescriptor(\n"
-                   "    &$type$_descriptor);\n");
-  }
-}
-
-void MapFieldGenerator::
 GenerateCopyConstructorCode(io::Printer* printer) const {
   GenerateConstructorCode(printer);
   GenerateMergingCode(printer);
@@ -199,13 +181,15 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
   string value;
   if (IsProto3Field(descriptor_) ||
       value_field->type() != FieldDescriptor::TYPE_ENUM) {
-    printer->Print(variables_,
+    printer->Print(
+        variables_,
         "$map_classname$::Parser< ::google::protobuf::internal::MapField$lite$<\n"
-                   "    $key_cpp$, $val_cpp$,\n"
-                   "    $key_wire_type$,\n"
-                   "    $val_wire_type$,\n"
-                   "    $default_enum_value$ >,\n"
-                   "  ::google::protobuf::Map< $key_cpp$, $val_cpp$ > >"
+        "    $map_classname$,\n"
+        "    $key_cpp$, $val_cpp$,\n"
+        "    $key_wire_type$,\n"
+        "    $val_wire_type$,\n"
+        "    $default_enum_value$ >,\n"
+        "  ::google::protobuf::Map< $key_cpp$, $val_cpp$ > >"
         " parser(&$name$_);\n"
         "DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(\n"
         "    input, &parser));\n");
@@ -216,7 +200,7 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     key = "entry->key()";
     value = "entry->value()";
     printer->Print(variables_,
-        "::google::protobuf::scoped_ptr<$map_classname$> entry($name$_.NewEntry());\n");
+        "::std::unique_ptr<$map_classname$> entry($name$_.NewEntry());\n");
     printer->Print(variables_,
         "{\n"
         "  ::std::string data;\n"
@@ -233,7 +217,8 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     } else {
       printer->Print(variables_,
           "    unknown_fields_stream.WriteVarint32($tag$u);\n"
-          "    unknown_fields_stream.WriteVarint32(data.size());\n"
+          "    unknown_fields_stream.WriteVarint32(\n"
+          "        static_cast< ::google::protobuf::uint32>(data.size()));\n"
           "    unknown_fields_stream.WriteString(data);\n");
     }
 
@@ -244,12 +229,16 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
 
   if (key_field->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
-    key_field, options_, true, variables_,
-        StrCat(key, ".data(), ", key, ".length(),\n").data(), printer);
+        key_field, options_, true, variables_,
+        StrCat(key, ".data(), static_cast<int>(", key, ".length()),\n").data(),
+        printer);
   }
   if (value_field->type() == FieldDescriptor::TYPE_STRING) {
-    GenerateUtf8CheckCodeForString(value_field, options_, true, variables_,
-        StrCat(value, ".data(), ", value, ".length(),\n").data(), printer);
+    GenerateUtf8CheckCodeForString(
+        value_field, options_, true, variables_,
+        StrCat(value, ".data(), static_cast<int>(", value, ".length()),\n")
+            .data(),
+        printer);
   }
 
   // If entry is allocated by arena, its desctructor should be avoided.
@@ -267,7 +256,7 @@ static void GenerateSerializationLoop(io::Printer* printer,
                                       const string& ptr,
                                       bool loop_via_iterators) {
   printer->Print(variables,
-      StrCat("::google::protobuf::scoped_ptr<$map_classname$> entry;\n",
+      StrCat("::std::unique_ptr<$map_classname$> entry;\n",
              loop_header, " {\n").c_str());
   printer->Indent();
 
@@ -353,14 +342,14 @@ void MapFieldGenerator::GenerateSerializeWithCachedSizes(
     printer->Indent();
     printer->Indent();
     if (string_key) {
-      GenerateUtf8CheckCodeForString(key_field, options_, false, variables,
-                                     "p->first.data(), p->first.length(),\n",
-                                     printer);
+      GenerateUtf8CheckCodeForString(
+          key_field, options_, false, variables,
+          "p->first.data(), static_cast<int>(p->first.length()),\n", printer);
     }
     if (string_value) {
-      GenerateUtf8CheckCodeForString(value_field, options_, false, variables,
-                                     "p->second.data(), p->second.length(),\n",
-                                     printer);
+      GenerateUtf8CheckCodeForString(
+          value_field, options_, false, variables,
+          "p->second.data(), static_cast<int>(p->second.length()),\n", printer);
     }
     printer->Outdent();
     printer->Outdent();
@@ -374,20 +363,21 @@ void MapFieldGenerator::GenerateSerializeWithCachedSizes(
       "\n"
       "if ($deterministic$ &&\n"
       "    this->$name$().size() > 1) {\n"
-      "  ::google::protobuf::scoped_array<SortItem> items(\n"
+      "  ::std::unique_ptr<SortItem[]> items(\n"
       "      new SortItem[this->$name$().size()]);\n"
       "  typedef ::google::protobuf::Map< $key_cpp$, $val_cpp$ >::size_type size_type;\n"
       "  size_type n = 0;\n"
       "  for (::google::protobuf::Map< $key_cpp$, $val_cpp$ >::const_iterator\n"
       "      it = this->$name$().begin();\n"
       "      it != this->$name$().end(); ++it, ++n) {\n"
-      "    items[n] = SortItem(&*it);\n"
+      "    items[static_cast<ptrdiff_t>(n)] = SortItem(&*it);\n"
       "  }\n"
-      "  ::std::sort(&items[0], &items[n], Less());\n");
+      "  ::std::sort(&items[0], &items[static_cast<ptrdiff_t>(n)], Less());\n");
   printer->Indent();
   GenerateSerializationLoop(printer, variables, SupportsArenas(descriptor_),
-                            utf8_check, "for (size_type i = 0; i < n; i++)",
-                            string_key ? "items[i]" : "items[i].second", false);
+      utf8_check, "for (size_type i = 0; i < n; i++)",
+      string_key ? "items[static_cast<ptrdiff_t>(i)]" :
+                   "items[static_cast<ptrdiff_t>(i)].second", false);
   printer->Outdent();
   printer->Print(
       "} else {\n");
@@ -410,7 +400,7 @@ GenerateByteSize(io::Printer* printer) const {
       "total_size += $tag_size$ *\n"
       "    ::google::protobuf::internal::FromIntSize(this->$name$_size());\n"
       "{\n"
-      "  ::google::protobuf::scoped_ptr<$map_classname$> entry;\n"
+      "  ::std::unique_ptr<$map_classname$> entry;\n"
       "  for (::google::protobuf::Map< $key_cpp$, $val_cpp$ >::const_iterator\n"
       "      it = this->$name$().begin();\n"
       "      it != this->$name$().end(); ++it) {\n");
diff --git a/src/google/protobuf/compiler/cpp/cpp_map_field.h b/src/google/protobuf/compiler/cpp/cpp_map_field.h
index 816687b3..0d54f0ea 100644
--- a/src/google/protobuf/compiler/cpp/cpp_map_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_map_field.h
@@ -49,12 +49,11 @@ class MapFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
-  void GenerateConstructorCode(io::Printer* printer) const;
+  void GenerateConstructorCode(io::Printer* printer) const {}
   void GenerateCopyConstructorCode(io::Printer* printer) const;
   void GenerateMergeFromCodedStream(io::Printer* printer) const;
   void GenerateSerializeWithCachedSizes(io::Printer* printer) const;
@@ -67,7 +66,6 @@ class MapFieldGenerator : public FieldGenerator {
       io::Printer* printer, const std::map<string, string>& variables) const;
 
   const FieldDescriptor* descriptor_;
-  const bool dependent_field_;
   std::map<string, string> variables_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldGenerator);
diff --git a/src/google/protobuf/compiler/cpp/cpp_message.cc b/src/google/protobuf/compiler/cpp/cpp_message.cc
index 6274ba29..778fc406 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_message.cc
@@ -32,25 +32,30 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
+#include <google/protobuf/compiler/cpp/cpp_message.h>
+
 #include <algorithm>
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <utility>
 #include <vector>
-#include <google/protobuf/compiler/cpp/cpp_message.h>
-#include <google/protobuf/compiler/cpp/cpp_field.h>
+
 #include <google/protobuf/compiler/cpp/cpp_enum.h>
 #include <google/protobuf/compiler/cpp/cpp_extension.h>
+#include <google/protobuf/compiler/cpp/cpp_field.h>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/io/printer.h>
+#include <google/protobuf/compiler/cpp/cpp_padding_optimizer.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/generated_message_table_driven.h>
+#include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/map_entry_lite.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/substitute.h>
+
 
 
 namespace google {
@@ -103,167 +108,19 @@ struct ExtensionRangeSorter {
   }
 };
 
-// Returns true if the "required" restriction check should be ignored for the
-// given field.
-inline static bool ShouldIgnoreRequiredFieldCheck(const FieldDescriptor* field,
-                                                  const Options& options) {
-  return false;
-}
-
-// Returns true if the message type has any required fields.  If it doesn't,
-// we can optimize out calls to its IsInitialized() method.
-//
-// already_seen is used to avoid checking the same type multiple times
-// (and also to protect against recursion).
-static bool HasRequiredFields(const Descriptor* type, const Options& options,
-                              hash_set<const Descriptor*>* already_seen) {
-  if (already_seen->count(type) > 0) {
-    // Since the first occurrence of a required field causes the whole
-    // function to return true, we can assume that if the type is already
-    // in the cache it didn't have any required fields.
-    return false;
-  }
-  already_seen->insert(type);
-
-  // If the type has extensions, an extension with message type could contain
-  // required fields, so we have to be conservative and assume such an
-  // extension exists.
-  if (type->extension_range_count() > 0) return true;
-
-  for (int i = 0; i < type->field_count(); i++) {
-    const FieldDescriptor* field = type->field(i);
-    if (field->is_required()) {
-      return true;
-    }
-    if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
-        !ShouldIgnoreRequiredFieldCheck(field, options)) {
-      if (HasRequiredFields(field->message_type(), options, already_seen)) {
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-static bool HasRequiredFields(const Descriptor* type, const Options& options) {
-  hash_set<const Descriptor*> already_seen;
-  return HasRequiredFields(type, options, &already_seen);
-}
-
-// This returns an estimate of the compiler's alignment for the field.  This
-// can't guarantee to be correct because the generated code could be compiled on
-// different systems with different alignment rules.  The estimates below assume
-// 64-bit pointers.
-int EstimateAlignmentSize(const FieldDescriptor* field) {
-  if (field == NULL) return 0;
-  if (field->is_repeated()) return 8;
+bool IsPOD(const FieldDescriptor* field) {
+  if (field->is_repeated() || field->is_extension()) return false;
   switch (field->cpp_type()) {
-    case FieldDescriptor::CPPTYPE_BOOL:
-      return 1;
-
-    case FieldDescriptor::CPPTYPE_INT32:
-    case FieldDescriptor::CPPTYPE_UINT32:
     case FieldDescriptor::CPPTYPE_ENUM:
-    case FieldDescriptor::CPPTYPE_FLOAT:
-      return 4;
-
+    case FieldDescriptor::CPPTYPE_INT32:
     case FieldDescriptor::CPPTYPE_INT64:
+    case FieldDescriptor::CPPTYPE_UINT32:
     case FieldDescriptor::CPPTYPE_UINT64:
+    case FieldDescriptor::CPPTYPE_FLOAT:
     case FieldDescriptor::CPPTYPE_DOUBLE:
-    case FieldDescriptor::CPPTYPE_STRING:
-    case FieldDescriptor::CPPTYPE_MESSAGE:
-      return 8;
-  }
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return -1;  // Make compiler happy.
-}
-
-// FieldGroup is just a helper for OptimizePadding below.  It holds a vector of
-// fields that are grouped together because they have compatible alignment, and
-// a preferred location in the final field ordering.
-class FieldGroup {
- public:
-  FieldGroup()
-      : preferred_location_(0) {}
-
-  // A group with a single field.
-  FieldGroup(float preferred_location, const FieldDescriptor* field)
-      : preferred_location_(preferred_location),
-        fields_(1, field) {}
-
-  // Append the fields in 'other' to this group.
-  void Append(const FieldGroup& other) {
-    if (other.fields_.empty()) {
-      return;
-    }
-    // Preferred location is the average among all the fields, so we weight by
-    // the number of fields on each FieldGroup object.
-    preferred_location_ =
-        (preferred_location_ * fields_.size() +
-         (other.preferred_location_ * other.fields_.size())) /
-        (fields_.size() + other.fields_.size());
-    fields_.insert(fields_.end(), other.fields_.begin(), other.fields_.end());
-  }
-
-  void SetPreferredLocation(float location) { preferred_location_ = location; }
-  const std::vector<const FieldDescriptor*>& fields() const { return fields_; }
-
-  // FieldGroup objects sort by their preferred location.
-  bool operator<(const FieldGroup& other) const {
-    return preferred_location_ < other.preferred_location_;
-  }
-
- private:
-  // "preferred_location_" is an estimate of where this group should go in the
-  // final list of fields.  We compute this by taking the average index of each
-  // field in this group in the original ordering of fields.  This is very
-  // approximate, but should put this group close to where its member fields
-  // originally went.
-  float preferred_location_;
-  std::vector<const FieldDescriptor*> fields_;
-  // We rely on the default copy constructor and operator= so this type can be
-  // used in a vector.
-};
-
-// Helper for the code that emits the Clear() method.
-bool CanInitializeByZeroing(const FieldDescriptor* field) {
-  if (field->is_repeated() || field->is_extension()) return false;
-  switch (field->cpp_type()) {
-    case internal::WireFormatLite::CPPTYPE_ENUM:
-      return field->default_value_enum()->number() == 0;
-    case internal::WireFormatLite::CPPTYPE_INT32:
-      return field->default_value_int32() == 0;
-    case internal::WireFormatLite::CPPTYPE_INT64:
-      return field->default_value_int64() == 0;
-    case internal::WireFormatLite::CPPTYPE_UINT32:
-      return field->default_value_uint32() == 0;
-    case internal::WireFormatLite::CPPTYPE_UINT64:
-      return field->default_value_uint64() == 0;
-    case internal::WireFormatLite::CPPTYPE_FLOAT:
-      return field->default_value_float() == 0;
-    case internal::WireFormatLite::CPPTYPE_DOUBLE:
-      return field->default_value_double() == 0;
-    case internal::WireFormatLite::CPPTYPE_BOOL:
-      return field->default_value_bool() == false;
-    default:
-      return false;
-  }
-}
-
-bool IsPOD(const FieldDescriptor* field) {
-  if (field->is_repeated() || field->is_extension()) return false;
-  switch (field->cpp_type()) {
-    case internal::WireFormatLite::CPPTYPE_ENUM:
-    case internal::WireFormatLite::CPPTYPE_INT32:
-    case internal::WireFormatLite::CPPTYPE_INT64:
-    case internal::WireFormatLite::CPPTYPE_UINT32:
-    case internal::WireFormatLite::CPPTYPE_UINT64:
-    case internal::WireFormatLite::CPPTYPE_FLOAT:
-    case internal::WireFormatLite::CPPTYPE_DOUBLE:
-    case internal::WireFormatLite::CPPTYPE_BOOL:
+    case FieldDescriptor::CPPTYPE_BOOL:
       return true;
-    case internal::WireFormatLite::CPPTYPE_STRING:
+    case FieldDescriptor::CPPTYPE_STRING:
       return false;
     default:
       return false;
@@ -284,132 +141,6 @@ bool CanConstructByZeroing(const FieldDescriptor* field,
   return ret;
 }
 
-// Reorder 'fields' so that if the fields are output into a c++ class in the new
-// order, fields of similiar family (see below) are together and within each
-// family, alignment padding is minimized.
-//
-// We try to do this while keeping each field as close as possible to its
-// declaration order (from the .proto file) so that we don't reduce cache
-// locality much for function that access each field in order.  This is also the
-// only (weak) signal we have for author intent concerning field layout.
-//
-// TODO(ckennelly):  If/when we have profiles available for the compiler, use
-// those rather than respect declaration order.
-//
-// We classify each field into a particular "family" of fields, that we perform
-// the same operation on in our generated functions.
-//
-// REPEATED is placed first, as the C++ compiler automatically initializes
-// these fields in layout order.
-//
-// STRING is grouped next, as our Clear/SharedCtor/SharedDtor walks it and
-// calls ArenaStringPtr::Destroy on each.
-//
-//
-// MESSAGE is grouped next, as our Clear/SharedDtor code walks it and calls
-// delete on each.  We initialize these fields with a NULL pointer (see
-// MessageFieldGenerator::GenerateConstructorCode), which allows them to be
-// memset.
-//
-// ZERO_INITIALIZABLE is memset in Clear/SharedCtor
-//
-// OTHER these fields are initialized one-by-one.
-void OptimizePadding(std::vector<const FieldDescriptor*>* fields,
-                     const Options& options) {
-  // The sorted numeric order of Family determines the declaration order in the
-  // memory layout.
-  enum Family {
-    REPEATED = 0,
-    STRING = 1,
-    MESSAGE = 2,
-    ZERO_INITIALIZABLE = 4,
-    OTHER = 5,
-    kMaxFamily
-  };
-
-  // First divide fields into those that align to 1 byte, 4 bytes or 8 bytes.
-  std::vector<FieldGroup> aligned_to_1[kMaxFamily];
-  std::vector<FieldGroup> aligned_to_4[kMaxFamily];
-  std::vector<FieldGroup> aligned_to_8[kMaxFamily];
-  for (int i = 0; i < fields->size(); ++i) {
-    const FieldDescriptor* field = (*fields)[i];
-
-    Family f = OTHER;
-    if (field->is_repeated()) {
-      f = REPEATED;
-    } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
-      f = STRING;
-    } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
-      f = MESSAGE;
-
-    } else if (CanInitializeByZeroing(field)) {
-      f = ZERO_INITIALIZABLE;
-    }
-
-    switch (EstimateAlignmentSize(field)) {
-      case 1: aligned_to_1[f].push_back(FieldGroup(i, field)); break;
-      case 4: aligned_to_4[f].push_back(FieldGroup(i, field)); break;
-      case 8: aligned_to_8[f].push_back(FieldGroup(i, field)); break;
-      default:
-        GOOGLE_LOG(FATAL) << "Unknown alignment size.";
-    }
-  }
-
-  // For each family, group fields to optimize padding.
-  for (int f = 0; f < kMaxFamily; f++) {
-    // Now group fields aligned to 1 byte into sets of 4, and treat those like a
-    // single field aligned to 4 bytes.
-    for (int i = 0; i < aligned_to_1[f].size(); i += 4) {
-      FieldGroup field_group;
-      for (int j = i; j < aligned_to_1[f].size() && j < i + 4; ++j) {
-        field_group.Append(aligned_to_1[f][j]);
-      }
-      aligned_to_4[f].push_back(field_group);
-    }
-    // Sort by preferred location to keep fields as close to their declaration
-    // order as possible.  Using stable_sort ensures that the output is
-    // consistent across runs.
-    std::stable_sort(aligned_to_4[f].begin(), aligned_to_4[f].end());
-
-    // Now group fields aligned to 4 bytes (or the 4-field groups created above)
-    // into pairs, and treat those like a single field aligned to 8 bytes.
-    for (int i = 0; i < aligned_to_4[f].size(); i += 2) {
-      FieldGroup field_group;
-      for (int j = i; j < aligned_to_4[f].size() && j < i + 2; ++j) {
-        field_group.Append(aligned_to_4[f][j]);
-      }
-      if (i == aligned_to_4[f].size() - 1) {
-        if (f == OTHER) {
-          // Move incomplete 4-byte block to the beginning.  This is done to
-          // pair with the (possible) leftover blocks from the
-          // ZERO_INITIALIZABLE family.
-          field_group.SetPreferredLocation(-1);
-        } else {
-          // Move incomplete 4-byte block to the end.
-          field_group.SetPreferredLocation(fields->size() + 1);
-        }
-      }
-      aligned_to_8[f].push_back(field_group);
-    }
-    // Sort by preferred location.
-    std::stable_sort(aligned_to_8[f].begin(), aligned_to_8[f].end());
-  }
-
-  // Now pull out all the FieldDescriptors in order.
-  fields->clear();
-  for (int f = 0; f < kMaxFamily; ++f) {
-    for (int i = 0; i < aligned_to_8[f].size(); ++i) {
-      fields->insert(fields->end(),
-                     aligned_to_8[f][i].fields().begin(),
-                     aligned_to_8[f][i].fields().end());
-    }
-  }
-}
-
-string MessageTypeProtoName(const FieldDescriptor* field) {
-  return field->message_type()->full_name();
-}
-
 // Emits an if-statement with a condition that evaluates to true if |field| is
 // considered non-default (will be sent over the wire), for message types
 // without true field presence. Should only be called if
@@ -464,25 +195,31 @@ bool HasHasMethod(const FieldDescriptor* field) {
 void CollectMapInfo(const Descriptor* descriptor,
                     std::map<string, string>* variables) {
   GOOGLE_CHECK(IsMapEntryMessage(descriptor));
+  std::map<string, string>& vars = *variables;
   const FieldDescriptor* key = descriptor->FindFieldByName("key");
   const FieldDescriptor* val = descriptor->FindFieldByName("value");
-  (*variables)["key"] = PrimitiveTypeName(key->cpp_type());
+  vars["key_cpp"] = PrimitiveTypeName(key->cpp_type());
   switch (val->cpp_type()) {
     case FieldDescriptor::CPPTYPE_MESSAGE:
-      (*variables)["val"] = FieldMessageTypeName(val);
+      vars["val_cpp"] = FieldMessageTypeName(val);
       break;
     case FieldDescriptor::CPPTYPE_ENUM:
-      (*variables)["val"] = ClassName(val->enum_type(), true);
+      vars["val_cpp"] = ClassName(val->enum_type(), true);
       break;
     default:
-      (*variables)["val"] = PrimitiveTypeName(val->cpp_type());
+      vars["val_cpp"] = PrimitiveTypeName(val->cpp_type());
+  }
+  vars["key_wire_type"] = "::google::protobuf::internal::WireFormatLite::TYPE_" +
+                          ToUpper(DeclaredTypeMethodName(key->type()));
+  vars["val_wire_type"] = "::google::protobuf::internal::WireFormatLite::TYPE_" +
+                          ToUpper(DeclaredTypeMethodName(val->type()));
+  if (descriptor->file()->syntax() != FileDescriptor::SYNTAX_PROTO3 &&
+      val->type() == FieldDescriptor::TYPE_ENUM) {
+    const EnumValueDescriptor* default_value = val->default_value_enum();
+    vars["default_enum_value"] = Int32ToString(default_value->number());
+  } else {
+    vars["default_enum_value"] = "0";
   }
-  (*variables)["key_wire_type"] =
-      "::google::protobuf::internal::WireFormatLite::TYPE_" +
-      ToUpper(DeclaredTypeMethodName(key->type()));
-  (*variables)["val_wire_type"] =
-      "::google::protobuf::internal::WireFormatLite::TYPE_" +
-      ToUpper(DeclaredTypeMethodName(val->type()));
 }
 
 // Does the given field have a private (internal helper only) has_$name$()
@@ -495,33 +232,233 @@ bool HasPrivateHasMethod(const FieldDescriptor* field) {
 }
 
 
+bool TableDrivenParsingEnabled(
+    const Descriptor* descriptor, const Options& options) {
+  if (!options.table_driven_parsing) {
+    return false;
+  }
+
+  // Consider table-driven parsing.  We only do this if:
+  // - We have has_bits for fields.  This avoids a check on every field we set
+  //   when are present (the common case).
+  if (!HasFieldPresence(descriptor->file())) {
+    return false;
+  }
+
+  const double table_sparseness = 0.5;
+  int max_field_number = 0;
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    const FieldDescriptor* field = descriptor->field(i);
+    if (max_field_number < field->number()) {
+      max_field_number = field->number();
+    }
+
+    // - There are no weak fields.
+    if (field->options().weak()) {
+      return false;
+    }
+  }
+
+  // - There range of field numbers is "small"
+  if (max_field_number >= (2 << 14)) {
+    return false;
+  }
+
+  // - Field numbers are relatively dense within the actual number of fields.
+  //   We check for strictly greater than in the case where there are no fields
+  //   (only extensions) so max_field_number == descriptor->field_count() == 0.
+  if (max_field_number * table_sparseness > descriptor->field_count()) {
+    return false;
+  }
+
+  // - This is not a MapEntryMessage.
+  if (IsMapEntryMessage(descriptor)) {
+    return false;
+  }
+
+  return true;
+}
+
+void SetUnknkownFieldsVariable(const Descriptor* descriptor,
+                               const Options& options,
+                               std::map<string, string>* variables) {
+  if (UseUnknownFieldSet(descriptor->file(), options)) {
+    (*variables)["unknown_fields_type"] = "::google::protobuf::UnknownFieldSet";
+  } else {
+    (*variables)["unknown_fields_type"] = "::std::string";
+  }
+  if (AlwaysPreserveUnknownFields(descriptor)) {
+    (*variables)["have_unknown_fields"] =
+        "_internal_metadata_.have_unknown_fields()";
+    (*variables)["unknown_fields"] = "_internal_metadata_.unknown_fields()";
+  } else {
+    (*variables)["have_unknown_fields"] =
+        "(_internal_metadata_.have_unknown_fields() && "
+        " ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())";
+    (*variables)["unknown_fields"] =
+        "(::google::protobuf::internal::GetProto3PreserveUnknownsDefault()"
+        "   ? _internal_metadata_.unknown_fields()"
+        "   : _internal_metadata_.default_instance())";
+  }
+  (*variables)["mutable_unknown_fields"] =
+      "_internal_metadata_.mutable_unknown_fields()";
+}
+
+bool IsCrossFileMapField(const FieldDescriptor* field) {
+  if (!field->is_map()) {
+    return false;
+  }
+
+  const Descriptor* d = field->message_type();
+  const FieldDescriptor* value = d->FindFieldByNumber(2);
+
+  return IsCrossFileMessage(value);
+}
+
+bool IsCrossFileMaybeMap(const FieldDescriptor* field) {
+  if (IsCrossFileMapField(field)) {
+    return true;
+  }
+
+  return IsCrossFileMessage(field);
+}
+
+bool IsRequired(const std::vector<const FieldDescriptor*>& v) {
+  return v.front()->is_required();
+}
+
+// Allows chunking repeated fields together and non-repeated fields if the
+// fields share the same has_byte index.
+// TODO(seongkim): use lambda with capture instead of functor.
+class MatchRepeatedAndHasByte {
+ public:
+  MatchRepeatedAndHasByte(const std::vector<int>* has_bit_indices,
+                          bool has_field_presence)
+      : has_bit_indices_(*has_bit_indices),
+        has_field_presence_(has_field_presence) {}
+
+  // Returns true if the following conditions are met:
+  // --both fields are repeated fields
+  // --both fields are non-repeated fields with either has_field_presence is
+  //   false or have the same has_byte index.
+  bool operator()(const FieldDescriptor* a, const FieldDescriptor* b) const {
+    return a->is_repeated() == b->is_repeated() &&
+           (!has_field_presence_ || a->is_repeated() ||
+            has_bit_indices_[a->index()] / 8 ==
+                has_bit_indices_[b->index()] / 8);
+  }
+
+ private:
+  const std::vector<int>& has_bit_indices_;
+  const bool has_field_presence_;
+};
+
+// Allows chunking required fields separately after chunking with
+// MatchRepeatedAndHasByte.
+class MatchRepeatedAndHasByteAndRequired : public MatchRepeatedAndHasByte {
+ public:
+  MatchRepeatedAndHasByteAndRequired(const std::vector<int>* has_bit_indices,
+                                     bool has_field_presence)
+      : MatchRepeatedAndHasByte(has_bit_indices, has_field_presence) {}
+
+  bool operator()(const FieldDescriptor* a, const FieldDescriptor* b) const {
+    return MatchRepeatedAndHasByte::operator()(a, b) &&
+           a->is_required() == b->is_required();
+  }
+};
+
+// Allows chunking zero-initializable fields separately after chunking with
+// MatchRepeatedAndHasByte.
+class MatchRepeatedAndHasByteAndZeroInits : public MatchRepeatedAndHasByte {
+ public:
+  MatchRepeatedAndHasByteAndZeroInits(const std::vector<int>* has_bit_indices,
+                                      bool has_field_presence)
+      : MatchRepeatedAndHasByte(has_bit_indices, has_field_presence) {}
+
+  bool operator()(const FieldDescriptor* a, const FieldDescriptor* b) const {
+    return MatchRepeatedAndHasByte::operator()(a, b) &&
+           CanInitializeByZeroing(a) == CanInitializeByZeroing(b);
+  }
+};
+
+// Collects neighboring fields based on a given criteria (equivalent predicate).
+template <typename Predicate>
+std::vector<std::vector<const FieldDescriptor*> > CollectFields(
+    const std::vector<const FieldDescriptor*>& fields,
+    const Predicate& equivalent) {
+  std::vector<std::vector<const FieldDescriptor*> > chunks;
+  if (fields.empty()) {
+    return chunks;
+  }
+
+  const FieldDescriptor* last_field = fields.front();
+  std::vector<const FieldDescriptor*> chunk;
+  for (int i = 0; i < fields.size(); i++) {
+    if (!equivalent(last_field, fields[i]) && !chunk.empty()) {
+      chunks.push_back(chunk);
+      chunk.clear();
+    }
+    chunk.push_back(fields[i]);
+    last_field = fields[i];
+  }
+  if (!chunk.empty()) {
+    chunks.push_back(chunk);
+  }
+  return chunks;
+}
+
+// Returns a bit mask based on has_bit index of "fields" that are typically on
+// the same chunk. It is used in a group presence check where _has_bits_ is
+// masked to tell if any thing in "fields" is present.
+uint32 GenChunkMask(const std::vector<const FieldDescriptor*>& fields,
+                    const std::vector<int>& has_bit_indices) {
+  GOOGLE_CHECK(!fields.empty());
+  int first_index_offset = has_bit_indices[fields.front()->index()] / 32;
+  uint32 chunk_mask = 0;
+  for (int i = 0; i < fields.size(); i++) {
+    const FieldDescriptor* field = fields[i];
+    // "index" defines where in the _has_bits_ the field appears.
+    int index = has_bit_indices[field->index()];
+    GOOGLE_CHECK_EQ(first_index_offset, index / 32);
+    chunk_mask |= static_cast<uint32>(1) << (index % 32);
+  }
+  GOOGLE_CHECK_NE(0, chunk_mask);
+  return chunk_mask;
+}
+
 }  // anonymous namespace
 
 // ===================================================================
 
 MessageGenerator::MessageGenerator(const Descriptor* descriptor,
-                                   const Options& options)
+                                   int index_in_file_messages,
+                                   const Options& options,
+                                   SCCAnalyzer* scc_analyzer)
     : descriptor_(descriptor),
+      index_in_file_messages_(index_in_file_messages),
       classname_(ClassName(descriptor, false)),
       options_(options),
-      field_generators_(descriptor, options),
+      field_generators_(descriptor, options, scc_analyzer),
       max_has_bit_index_(0),
-      nested_generators_(new google::protobuf::scoped_ptr<
-          MessageGenerator>[descriptor->nested_type_count()]),
       enum_generators_(
-          new google::protobuf::scoped_ptr<EnumGenerator>[descriptor->enum_type_count()]),
-      extension_generators_(new google::protobuf::scoped_ptr<
-          ExtensionGenerator>[descriptor->extension_count()]),
-      use_dependent_base_(false) {
-
+          new std::unique_ptr<EnumGenerator>[descriptor->enum_type_count()]),
+      extension_generators_(new std::unique_ptr<
+                            ExtensionGenerator>[descriptor->extension_count()]),
+      num_weak_fields_(0),
+      message_layout_helper_(new PaddingOptimizer()),
+      scc_analyzer_(scc_analyzer) {
   // Compute optimized field order to be used for layout and initialization
   // purposes.
   for (int i = 0; i < descriptor_->field_count(); i++) {
-    if (!descriptor_->field(i)->containing_oneof()) {
-      optimized_order_.push_back(descriptor_->field(i));
+    const FieldDescriptor* field = descriptor_->field(i);
+    if (field->options().weak()) {
+      num_weak_fields_++;
+    } else if (!field->containing_oneof()) {
+      optimized_order_.push_back(field);
     }
   }
-  OptimizePadding(&optimized_order_, options_);
+
+  message_layout_helper_->OptimizeLayout(&optimized_order_, options_);
 
   if (HasFieldPresence(descriptor_->file())) {
     // We use -1 as a sentinel.
@@ -537,11 +474,6 @@ MessageGenerator::MessageGenerator(const Descriptor* descriptor,
     }
   }
 
-  for (int i = 0; i < descriptor->nested_type_count(); i++) {
-    nested_generators_[i].reset(
-      new MessageGenerator(descriptor->nested_type(i), options));
-  }
-
   for (int i = 0; i < descriptor->enum_type_count(); i++) {
     enum_generators_[i].reset(
       new EnumGenerator(descriptor->enum_type(i), options));
@@ -557,14 +489,12 @@ MessageGenerator::MessageGenerator(const Descriptor* descriptor,
     if (descriptor->field(i)->is_required()) {
       ++num_required_fields_;
     }
-    if (options.proto_h && IsFieldDependent(descriptor->field(i))) {
-      use_dependent_base_ = true;
-    }
-  }
-  if (options.proto_h && descriptor->oneof_decl_count() > 0) {
-    // Always make oneofs dependent.
-    use_dependent_base_ = true;
   }
+
+  table_driven_ = TableDrivenParsingEnabled(descriptor_, options_);
+
+  scc_name_ =
+      ClassName(scc_analyzer_->GetSCC(descriptor_)->GetRepresentative(), false);
 }
 
 MessageGenerator::~MessageGenerator() {}
@@ -582,13 +512,6 @@ size_t MessageGenerator::HasBitsSize() const {
   return sizeof_has_bits;
 }
 
-void MessageGenerator::Flatten(std::vector<MessageGenerator*>* list) {
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-    nested_generators_[i]->Flatten(list);
-  }
-  list->push_back(this);
-}
-
 void MessageGenerator::AddGenerators(
     std::vector<EnumGenerator*>* enum_generators,
     std::vector<ExtensionGenerator*>* extension_generators) {
@@ -602,33 +525,10 @@ void MessageGenerator::AddGenerators(
 
 void MessageGenerator::FillMessageForwardDeclarations(
     std::map<string, const Descriptor*>* class_names) {
-  if (IsMapEntryMessage(descriptor_)) return;
   (*class_names)[classname_] = descriptor_;
 }
 
 void MessageGenerator::
-GenerateDependentFieldAccessorDeclarations(io::Printer* printer) {
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = descriptor_->field(i);
-
-    PrintFieldComment(printer, field);
-
-    std::map<string, string> vars;
-    SetCommonFieldVariables(field, &vars, options_);
-
-    if (use_dependent_base_ && IsFieldDependent(field)) {
-      // If the message is dependent, the inline clear_*() method will need
-      // to delete the message type, so it must be in the dependent base
-      // class. (See also GenerateFieldAccessorDeclarations.)
-      printer->Print(vars, "$deprecated_attr$void clear_$name$();\n");
-    }
-    // Generate type-specific accessor declarations.
-    field_generators_.get(field).GenerateDependentAccessorDeclarations(printer);
-    printer->Print("\n");
-  }
-}
-
-void MessageGenerator::
 GenerateFieldAccessorDeclarations(io::Printer* printer) {
   // optimized_fields_ does not contain fields where
   //    field->containing_oneof() != NULL
@@ -644,7 +544,7 @@ GenerateFieldAccessorDeclarations(io::Printer* printer) {
       ordered_fields.begin(), optimized_order_.begin(), optimized_order_.end());
   for (int i = 0; i < descriptor_->field_count(); i++) {
     const FieldDescriptor* field = descriptor_->field(i);
-    if (field->containing_oneof() == NULL) {
+    if (field->containing_oneof() == NULL && !field->options().weak()) {
       continue;
     }
     ordered_fields.push_back(field);
@@ -659,40 +559,26 @@ GenerateFieldAccessorDeclarations(io::Printer* printer) {
     SetCommonFieldVariables(field, &vars, options_);
     vars["constant_name"] = FieldConstantName(field);
 
-    bool dependent_field = use_dependent_base_ && IsFieldDependent(field);
-    if (dependent_field &&
-        field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
-        !field->is_map()) {
-      // If this field is dependent, the dependent base class determines
-      // the message type from the derived class (which is a template
-      // parameter). This typedef is for that:
-      printer->Print(
-          "private:\n"
-          "typedef $field_type$ $dependent_type$;\n"
-          "public:\n",
-          "field_type", FieldMessageTypeName(field),
-          "dependent_type", DependentTypeName(field));
-    }
-
     if (field->is_repeated()) {
-      printer->Print(vars, "$deprecated_attr$int $name$_size() const;\n");
+      printer->Print(vars, "$deprecated_attr$int ${$$name$_size$}$() const;\n");
+      printer->Annotate("{", "}", field);
     } else if (HasHasMethod(field)) {
-      printer->Print(vars, "$deprecated_attr$bool has_$name$() const;\n");
+      printer->Print(vars, "$deprecated_attr$bool ${$has_$name$$}$() const;\n");
+      printer->Annotate("{", "}", field);
     } else if (HasPrivateHasMethod(field)) {
       printer->Print(vars,
-          "private:\n"
-          "bool has_$name$() const;\n"
-          "public:\n");
+                     "private:\n"
+                     "bool ${$has_$name$$}$() const;\n"
+                     "public:\n");
+      printer->Annotate("{", "}", field);
     }
 
-    if (!dependent_field) {
-      // If this field is dependent, then its clear_() method is in the
-      // depenent base class. (See also GenerateDependentAccessorDeclarations.)
-      printer->Print(vars, "$deprecated_attr$void clear_$name$();\n");
-    }
+    printer->Print(vars, "$deprecated_attr$void ${$clear_$name$$}$();\n");
+    printer->Annotate("{", "}", field);
     printer->Print(vars,
                    "$deprecated_attr$static const int $constant_name$ = "
                    "$number$;\n");
+    printer->Annotate("constant_name", field);
 
     // Generate type-specific accessor declarations.
     field_generators_.get(field).GenerateAccessorDeclarations(printer);
@@ -710,6 +596,7 @@ GenerateFieldAccessorDeclarations(io::Printer* printer) {
 
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     printer->Print(
+        "void clear_$oneof_name$();\n"
         "$camel_oneof_name$Case $oneof_name$_case() const;\n",
         "camel_oneof_name",
         UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true),
@@ -718,65 +605,17 @@ GenerateFieldAccessorDeclarations(io::Printer* printer) {
 }
 
 void MessageGenerator::
-GenerateDependentFieldAccessorDefinitions(io::Printer* printer) {
-  if (!use_dependent_base_) return;
-
-  printer->Print("// $classname$\n\n", "classname",
-                 DependentBaseClassTemplateName(descriptor_));
-
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = descriptor_->field(i);
-
-    if (field->options().weak()) continue;
-
-    PrintFieldComment(printer, field);
-
-    // These functions are not really dependent: they are part of the
-    // (non-dependent) derived class. However, they need to live outside
-    // any #ifdef guards, so we treat them as if they were dependent.
-    //
-    // See the comment in FileGenerator::GenerateInlineFunctionDefinitions
-    // for a more complete explanation.
-    if (use_dependent_base_ && IsFieldDependent(field)) {
-      std::map<string, string> vars;
-      SetCommonFieldVariables(field, &vars, options_);
-      vars["inline"] = "inline ";
-      if (field->containing_oneof()) {
-        vars["field_name"] = UnderscoresToCamelCase(field->name(), true);
-        vars["oneof_name"] = field->containing_oneof()->name();
-        vars["oneof_index"] = SimpleItoa(field->containing_oneof()->index());
-        GenerateOneofMemberHasBits(field, vars, printer);
-      } else if (!field->is_repeated()) {
-        // There will be no header guard, so this always has to be inline.
-        GenerateSingularFieldHasBits(field, vars, printer);
-      }
-      // vars needed for clear_(), which is in the dependent base:
-      // (See also GenerateDependentFieldAccessorDeclarations.)
-      vars["tmpl"] = "template<class T>\n";
-      vars["dependent_classname"] =
-          DependentBaseClassTemplateName(descriptor_) + "<T>";
-      vars["this_message"] = DependentBaseDownCast();
-      vars["this_const_message"] = DependentBaseConstDownCast();
-      GenerateFieldClear(field, vars, printer);
-    }
-
-    // Generate type-specific accessors.
-    field_generators_.get(field)
-        .GenerateDependentInlineAccessorDefinitions(printer);
-
-    printer->Print("\n");
-  }
-
-  // Generate has_$name$() and clear_has_$name$() functions for oneofs
-  // Similar to other has-bits, these must always be in the header if we
-  // are using a dependent base class.
-  GenerateOneofHasBits(printer, true /* is_inline */);
-}
-
-void MessageGenerator::
 GenerateSingularFieldHasBits(const FieldDescriptor* field,
                              std::map<string, string> vars,
                              io::Printer* printer) {
+  if (field->options().weak()) {
+    printer->Print(
+        vars,
+        "inline bool $classname$::has_$name$() const {\n"
+        "  return _weak_field_map_.Has($number$);\n"
+        "}\n");
+    return;
+  }
   if (HasFieldPresence(descriptor_->file())) {
     // N.B.: without field presence, we do not use has-bits or generate
     // has_$name$() methods.
@@ -787,16 +626,13 @@ GenerateSingularFieldHasBits(const FieldDescriptor* field,
     vars["has_mask"] = StrCat(strings::Hex(1u << (has_bit_index % 32),
                                            strings::ZERO_PAD_8));
     printer->Print(vars,
-      "$inline$"
-      "bool $classname$::has_$name$() const {\n"
+      "inline bool $classname$::has_$name$() const {\n"
       "  return (_has_bits_[$has_array_index$] & 0x$has_mask$u) != 0;\n"
       "}\n"
-      "$inline$"
-      "void $classname$::set_has_$name$() {\n"
+      "inline void $classname$::set_has_$name$() {\n"
       "  _has_bits_[$has_array_index$] |= 0x$has_mask$u;\n"
       "}\n"
-      "$inline$"
-      "void $classname$::clear_has_$name$() {\n"
+      "inline void $classname$::clear_has_$name$() {\n"
       "  _has_bits_[$has_array_index$] &= ~0x$has_mask$u;\n"
       "}\n");
   } else {
@@ -805,15 +641,13 @@ GenerateSingularFieldHasBits(const FieldDescriptor* field,
       bool is_lazy = false;
       if (is_lazy) {
         printer->Print(vars,
-          "$inline$"
-          "bool $classname$::has_$name$() const {\n"
+          "inline bool $classname$::has_$name$() const {\n"
           "  return !$name$_.IsCleared();\n"
           "}\n");
       } else {
         printer->Print(
             vars,
-            "$inline$"
-            "bool $classname$::has_$name$() const {\n"
+            "inline bool $classname$::has_$name$() const {\n"
             "  return this != internal_default_instance() && $name$_ != NULL;\n"
             "}\n");
       }
@@ -822,7 +656,7 @@ GenerateSingularFieldHasBits(const FieldDescriptor* field,
 }
 
 void MessageGenerator::
-GenerateOneofHasBits(io::Printer* printer, bool is_inline) {
+GenerateOneofHasBits(io::Printer* printer) {
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     std::map<string, string> vars;
     vars["oneof_name"] = descriptor_->oneof_decl(i)->name();
@@ -830,15 +664,12 @@ GenerateOneofHasBits(io::Printer* printer, bool is_inline) {
     vars["cap_oneof_name"] =
         ToUpper(descriptor_->oneof_decl(i)->name());
     vars["classname"] = classname_;
-    vars["inline"] = (is_inline ? "inline " : "");
     printer->Print(
         vars,
-        "$inline$"
-        "bool $classname$::has_$oneof_name$() const {\n"
+        "inline bool $classname$::has_$oneof_name$() const {\n"
         "  return $oneof_name$_case() != $cap_oneof_name$_NOT_SET;\n"
         "}\n"
-        "$inline$"
-        "void $classname$::clear_has_$oneof_name$() {\n"
+        "inline void $classname$::clear_has_$oneof_name$() {\n"
         "  _oneof_case_[$oneof_index$] = $cap_oneof_name$_NOT_SET;\n"
         "}\n");
   }
@@ -855,13 +686,11 @@ GenerateOneofMemberHasBits(const FieldDescriptor* field,
   // method, so that generated code is slightly cleaner (vs.  comparing
   // _oneof_case_[index] against a constant everywhere).
   printer->Print(vars,
-    "$inline$"
-    "bool $classname$::has_$name$() const {\n"
+    "inline bool $classname$::has_$name$() const {\n"
     "  return $oneof_name$_case() == k$field_name$;\n"
     "}\n");
   printer->Print(vars,
-    "$inline$"
-    "void $classname$::set_has_$name$() {\n"
+    "inline void $classname$::set_has_$name$() {\n"
     "  _oneof_case_[$oneof_index$] = k$field_name$;\n"
     "}\n");
 }
@@ -869,14 +698,14 @@ GenerateOneofMemberHasBits(const FieldDescriptor* field,
 void MessageGenerator::
 GenerateFieldClear(const FieldDescriptor* field,
                    const std::map<string, string>& vars,
+                   bool is_inline,
                    io::Printer* printer) {
-  // Generate clear_$name$() (See GenerateFieldAccessorDeclarations and
-  // GenerateDependentFieldAccessorDeclarations, $dependent_classname$ is
-  // set by the Generate*Definitions functions.)
+  // Generate clear_$name$().
+  if (is_inline) {
+    printer->Print("inline ");
+  }
   printer->Print(vars,
-    "$tmpl$"
-    "$inline$"
-    "void $dependent_classname$::clear_$name$() {\n");
+    "void $classname$::clear_$name$() {\n");
 
   printer->Indent();
 
@@ -884,21 +713,20 @@ GenerateFieldClear(const FieldDescriptor* field,
     // Clear this field only if it is the active field in this oneof,
     // otherwise ignore
     printer->Print(vars,
-      "if ($this_message$has_$name$()) {\n");
+      "if (has_$name$()) {\n");
     printer->Indent();
     field_generators_.get(field)
         .GenerateClearingCode(printer);
     printer->Print(vars,
-      "$this_message$clear_has_$oneof_name$();\n");
+      "clear_has_$oneof_name$();\n");
     printer->Outdent();
     printer->Print("}\n");
   } else {
     field_generators_.get(field)
         .GenerateClearingCode(printer);
     if (HasFieldPresence(descriptor_->file())) {
-      if (!field->is_repeated()) {
-        printer->Print(vars,
-                       "$this_message$clear_has_$name$();\n");
+      if (!field->is_repeated() && !field->options().weak()) {
+        printer->Print(vars, "clear_has_$name$();\n");
       }
     }
   }
@@ -908,7 +736,7 @@ GenerateFieldClear(const FieldDescriptor* field,
 }
 
 void MessageGenerator::
-GenerateFieldAccessorDefinitions(io::Printer* printer, bool is_inline) {
+GenerateFieldAccessorDefinitions(io::Printer* printer) {
   printer->Print("// $classname$\n\n", "classname", classname_);
 
   for (int i = 0; i < descriptor_->field_count(); i++) {
@@ -918,96 +746,74 @@ GenerateFieldAccessorDefinitions(io::Printer* printer, bool is_inline) {
 
     std::map<string, string> vars;
     SetCommonFieldVariables(field, &vars, options_);
-    vars["inline"] = is_inline ? "inline " : "";
-    if (use_dependent_base_ && IsFieldDependent(field)) {
-      vars["tmpl"] = "template<class T>\n";
-      vars["dependent_classname"] =
-          DependentBaseClassTemplateName(descriptor_) + "<T>";
-      vars["this_message"] = "reinterpret_cast<T*>(this)->";
-      vars["this_const_message"] = "reinterpret_cast<const T*>(this)->";
-    } else {
-      vars["tmpl"] = "";
-      vars["dependent_classname"] = vars["classname"];
-      vars["this_message"] = "";
-      vars["this_const_message"] = "";
-    }
 
     // Generate has_$name$() or $name$_size().
     if (field->is_repeated()) {
       printer->Print(vars,
-        "$inline$"
-        "int $classname$::$name$_size() const {\n"
+        "inline int $classname$::$name$_size() const {\n"
         "  return $name$_.size();\n"
         "}\n");
     } else if (field->containing_oneof()) {
       vars["field_name"] = UnderscoresToCamelCase(field->name(), true);
       vars["oneof_name"] = field->containing_oneof()->name();
       vars["oneof_index"] = SimpleItoa(field->containing_oneof()->index());
-      if (!use_dependent_base_ || !IsFieldDependent(field)) {
-        GenerateOneofMemberHasBits(field, vars, printer);
-      }
+      GenerateOneofMemberHasBits(field, vars, printer);
     } else {
       // Singular field.
-      if (!use_dependent_base_ || !IsFieldDependent(field)) {
-        GenerateSingularFieldHasBits(field, vars, printer);
-      }
+      GenerateSingularFieldHasBits(field, vars, printer);
     }
 
-    if (!use_dependent_base_ || !IsFieldDependent(field)) {
-      GenerateFieldClear(field, vars, printer);
+    if (!IsCrossFileMaybeMap(field)) {
+      GenerateFieldClear(field, vars, true, printer);
     }
 
     // Generate type-specific accessors.
-    field_generators_.get(field).GenerateInlineAccessorDefinitions(printer,
-                                                                   is_inline);
+    field_generators_.get(field).GenerateInlineAccessorDefinitions(printer);
 
     printer->Print("\n");
   }
 
-  if (!use_dependent_base_) {
-    // Generate has_$name$() and clear_has_$name$() functions for oneofs
-    // If we aren't using a dependent base, they can be with the other functions
-    // that are #ifdef-guarded.
-    GenerateOneofHasBits(printer, is_inline);
-  }
-}
-
-void MessageGenerator::
-GenerateDependentBaseClassDefinition(io::Printer* printer) {
-  if (!use_dependent_base_) {
-    return;
-  }
-
-  std::map<string, string> vars;
-  vars["classname"] = DependentBaseClassTemplateName(descriptor_);
-  vars["full_name"] = descriptor_->full_name();
-  vars["superclass"] = SuperClassName(descriptor_, options_);
-
-  printer->Print(vars,
-    "template <class T>\n"
-    "class $classname$ : public $superclass$ "
-    "/* @@protoc_insertion_point(dep_base_class_definition:$full_name$) */ {\n"
-    " public:\n");
-  printer->Indent();
-
-  printer->Print(vars,
-    "$classname$() {}\n"
-    "virtual ~$classname$() {}\n"
-    "\n");
-
-  // Generate dependent accessor methods for all fields.
-  GenerateDependentFieldAccessorDeclarations(printer);
-
-  printer->Outdent();
-  printer->Print("};\n");
+  // Generate has_$name$() and clear_has_$name$() functions for oneofs.
+  GenerateOneofHasBits(printer);
 }
 
 void MessageGenerator::
 GenerateClassDefinition(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
-  if (use_dependent_base_) {
-    GenerateDependentBaseClassDefinition(printer);
-      printer->Print("\n");
+  if (IsMapEntryMessage(descriptor_)) {
+    std::map<string, string> vars;
+    vars["classname"] = classname_;
+    CollectMapInfo(descriptor_, &vars);
+    vars["lite"] =
+        HasDescriptorMethods(descriptor_->file(), options_) ? "" : "Lite";
+    printer->Print(
+        vars,
+        "class $classname$ : public "
+        "::google::protobuf::internal::MapEntry$lite$<$classname$, \n"
+        "    $key_cpp$, $val_cpp$,\n"
+        "    $key_wire_type$,\n"
+        "    $val_wire_type$,\n"
+        "    $default_enum_value$ > {\n"
+        "public:\n"
+        "  typedef ::google::protobuf::internal::MapEntry$lite$<$classname$, \n"
+        "    $key_cpp$, $val_cpp$,\n"
+        "    $key_wire_type$,\n"
+        "    $val_wire_type$,\n"
+        "    $default_enum_value$ > SuperType;\n"
+        "  $classname$();\n"
+        "  $classname$(::google::protobuf::Arena* arena);\n"
+        "  void MergeFrom(const $classname$& other);\n"
+        "  static const $classname$* internal_default_instance() { return "
+        "reinterpret_cast<const "
+        "$classname$*>(&_$classname$_default_instance_); }\n");
+    if (HasDescriptorMethods(descriptor_->file(), options_)) {
+      printer->Print(
+          "  void MergeFrom(const ::google::protobuf::Message& other) final;\n"
+          "  ::google::protobuf::Metadata GetMetadata() const;\n"
+          "};\n");
+    } else {
+      printer->Print("};\n");
+    }
+    return;
   }
 
   std::map<string, string> vars;
@@ -1020,49 +826,63 @@ GenerateClassDefinition(io::Printer* printer) {
   } else {
     vars["dllexport"] = options_.dllexport_decl + " ";
   }
-  if (use_dependent_base_) {
-    vars["superclass"] =
-        DependentBaseClassTemplateName(descriptor_) + "<" + classname_ + ">";
-  } else {
-    vars["superclass"] = SuperClassName(descriptor_, options_);
-  }
+  vars["superclass"] = SuperClassName(descriptor_, options_);
   printer->Print(vars,
     "class $dllexport$$classname$ : public $superclass$ "
     "/* @@protoc_insertion_point(class_definition:$full_name$) */ "
     "{\n");
   printer->Annotate("classname", descriptor_);
-  if (use_dependent_base_) {
-    printer->Print(vars, "  friend class $superclass$;\n");
-  }
   printer->Print(" public:\n");
   printer->Indent();
 
+  printer->Print(
+      vars,
+      "$classname$();\n"
+      "virtual ~$classname$();\n"
+      "\n"
+      "$classname$(const $classname$& from);\n"
+      "\n"
+      "inline $classname$& operator=(const $classname$& from) {\n"
+      "  CopyFrom(from);\n"
+      "  return *this;\n"
+      "}\n");
+
+  if (options_.table_driven_serialization) {
+    printer->Print(
+      "private:\n"
+      "const void* InternalGetTable() const;\n"
+      "public:\n"
+      "\n");
+  }
+
+  // Generate move constructor and move assignment operator.
   printer->Print(vars,
-    "$classname$();\n"
-    "virtual ~$classname$();\n"
-    "\n"
-    "$classname$(const $classname$& from);\n"
+    "#if LANG_CXX11\n"
+    "$classname$($classname$&& from) noexcept\n"
+    "  : $classname$() {\n"
+    "  *this = ::std::move(from);\n"
+    "}\n"
     "\n"
-    "inline $classname$& operator=(const $classname$& from) {\n"
-    "  CopyFrom(from);\n"
+    "inline $classname$& operator=($classname$&& from) noexcept {\n"
+    "  if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {\n"
+    "    if (this != &from) InternalSwap(&from);\n"
+    "  } else {\n"
+    "    CopyFrom(from);\n"
+    "  }\n"
     "  return *this;\n"
     "}\n"
-    "\n");
+    "#endif\n");
 
-  if (PreserveUnknownFields(descriptor_)) {
-    string type = UseUnknownFieldSet(descriptor_->file(), options_)
-                      ? "::google::protobuf::UnknownFieldSet"
-                      : "::std::string";
-    printer->Print(
-      "inline const $type$& unknown_fields() const {\n"
-      "  return _internal_metadata_.unknown_fields();\n"
-      "}\n"
-      "\n"
-      "inline $type$* mutable_unknown_fields() {\n"
-      "  return _internal_metadata_.mutable_unknown_fields();\n"
-      "}\n"
-      "\n",
-      "type", type );
+  SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+  if (PublicUnknownFieldsAccessors(descriptor_)) {
+    printer->Print(vars,
+        "inline const $unknown_fields_type$& unknown_fields() const {\n"
+        "  return $unknown_fields$;\n"
+        "}\n"
+        "inline $unknown_fields_type$* mutable_unknown_fields() {\n"
+        "  return $mutable_unknown_fields$;\n"
+        "}\n"
+        "\n");
   }
 
   // N.B.: We exclude GetArena() when arena support is disabled, falling back on
@@ -1072,10 +892,10 @@ GenerateClassDefinition(io::Printer* printer) {
     // virtual method version of GetArenaNoVirtual(), required for generic dispatch given a
     // MessageLite* (e.g., in RepeatedField::AddAllocated()).
     printer->Print(
-        "inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {\n"
+        "inline ::google::protobuf::Arena* GetArena() const final {\n"
         "  return GetArenaNoVirtual();\n"
         "}\n"
-        "inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {\n"
+        "inline void* GetMaybeArenaPointer() const final {\n"
         "  return MaybeArenaPtr();\n"
         "}\n");
   }
@@ -1119,15 +939,18 @@ GenerateClassDefinition(io::Printer* printer) {
   }
 
   // TODO(gerbens) make this private, while still granting other protos access.
+  vars["message_index"] = SimpleItoa(index_in_file_messages_);
   printer->Print(
       vars,
+      "static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY\n"
       "static inline const $classname$* internal_default_instance() {\n"
       "  return reinterpret_cast<const $classname$*>(\n"
       "             &_$classname$_default_instance_);\n"
       "}\n"
+      "static constexpr int kIndexInFileMessages =\n"
+      "  $message_index$;\n"
       "\n");
 
-
   if (SupportsArenas(descriptor_)) {
     printer->Print(vars,
       "void UnsafeArenaSwap($classname$* other);\n");
@@ -1144,39 +967,48 @@ GenerateClassDefinition(io::Printer* printer) {
       "template<typename T> bool Is() const {\n"
       "  return _any_metadata_.Is<T>();\n"
       "}\n"
+      "static bool ParseAnyTypeUrl(const string& type_url,\n"
+      "                            string* full_type_name);\n"
       "\n");
   }
 
-  vars["new_final"] = " PROTOBUF_FINAL";
+  vars["new_final"] = " final";
 
   printer->Print(vars,
     "void Swap($classname$* other);\n"
+    "friend void swap($classname$& a, $classname$& b) {\n"
+    "  a.Swap(&b);\n"
+    "}\n"
     "\n"
     "// implements Message ----------------------------------------------\n"
     "\n"
-    "inline $classname$* New() const$new_final$ { return New(NULL); }\n"
+    "inline $classname$* New() const$new_final$ {\n"
+    "  return CreateMaybeMessage<$classname$>(NULL);\n"
+    "}\n"
     "\n"
-    "$classname$* New(::google::protobuf::Arena* arena) const$new_final$;\n");
+    "$classname$* New(::google::protobuf::Arena* arena) const$new_final$ {\n"
+    "  return CreateMaybeMessage<$classname$>(arena);\n"
+    "}\n");
 
   // For instances that derive from Message (rather than MessageLite), some
   // methods are virtual and should be marked as final.
   string use_final = HasDescriptorMethods(descriptor_->file(), options_) ?
-      " PROTOBUF_FINAL" : "";
+      " final" : "";
 
   if (HasGeneratedMethods(descriptor_->file(), options_)) {
     if (HasDescriptorMethods(descriptor_->file(), options_)) {
       printer->Print(vars,
-        "void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;\n"
-        "void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;\n");
+        "void CopyFrom(const ::google::protobuf::Message& from) final;\n"
+        "void MergeFrom(const ::google::protobuf::Message& from) final;\n");
     } else {
       printer->Print(vars,
         "void CheckTypeAndMergeFrom(const ::google::protobuf::MessageLite& from)\n"
-        "  PROTOBUF_FINAL;\n");
+        "  final;\n");
     }
 
-    vars["clear_final"] = " PROTOBUF_FINAL";
-    vars["is_initialized_final"] = " PROTOBUF_FINAL";
-    vars["merge_partial_final"] = " PROTOBUF_FINAL";
+    vars["clear_final"] = " final";
+    vars["is_initialized_final"] = " final";
+    vars["merge_partial_final"] = " final";
 
     printer->Print(
         vars,
@@ -1185,11 +1017,16 @@ GenerateClassDefinition(io::Printer* printer) {
         "void Clear()$clear_final$;\n"
         "bool IsInitialized() const$is_initialized_final$;\n"
         "\n"
-        "size_t ByteSizeLong() const PROTOBUF_FINAL;\n"
+        "size_t ByteSizeLong() const final;\n"
         "bool MergePartialFromCodedStream(\n"
-        "    ::google::protobuf::io::CodedInputStream* input)$merge_partial_final$;\n"
-        "void SerializeWithCachedSizes(\n"
-        "    ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;\n");
+        "    ::google::protobuf::io::CodedInputStream* input)$merge_partial_final$;\n");
+    if (!options_.table_driven_serialization ||
+        descriptor_->options().message_set_wire_format()) {
+      printer->Print(
+          "void SerializeWithCachedSizes(\n"
+          "    ::google::protobuf::io::CodedOutputStream* output) const "
+          "final;\n");
+    }
     // DiscardUnknownFields() is implemented in message.cc using reflections. We
     // need to implement this function in generated code for messages.
     if (!UseUnknownFieldSet(descriptor_->file(), options_)) {
@@ -1199,28 +1036,24 @@ GenerateClassDefinition(io::Printer* printer) {
     }
     if (HasFastArraySerialization(descriptor_->file(), options_)) {
       printer->Print(
-          "::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(\n"
-          "    bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;\n"
-          "::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)\n"
-          "    const PROTOBUF_FINAL {\n"
-          "  return InternalSerializeWithCachedSizesToArray(\n"
-          "      ::google::protobuf::io::CodedOutputStream::"
-          "IsDefaultSerializationDeterministic(), output);\n"
-          "}\n");
+        "::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(\n"
+        "    bool deterministic, ::google::protobuf::uint8* target) const final;\n");
     }
   }
 
   printer->Print(
-    "int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }\n"
-    "private:\n"
-    "void SharedCtor();\n"
-    "void SharedDtor();\n"
-    "void SetCachedSize(int size) const$final$;\n"
-    "void InternalSwap($classname$* other);\n",
-    "classname", classname_,
-    "final", use_final);
+      "int GetCachedSize() const final { return _cached_size_.Get(); }"
+      "\n\nprivate:\n"
+      "void SharedCtor();\n"
+      "void SharedDtor();\n"
+      "void SetCachedSize(int size) const$final$;\n"
+      "void InternalSwap($classname$* other);\n",
+      "classname", classname_, "final", use_final);
   if (SupportsArenas(descriptor_)) {
     printer->Print(
+      // TODO(gerbens) Make this private! Currently people are deriving from
+      // protos to give access to this constructor, breaking the invariants
+      // we rely on.
       "protected:\n"
       "explicit $classname$(::google::protobuf::Arena* arena);\n"
       "private:\n"
@@ -1255,11 +1088,11 @@ GenerateClassDefinition(io::Printer* printer) {
 
   if (HasDescriptorMethods(descriptor_->file(), options_)) {
     printer->Print(
-      "::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;\n"
+      "::google::protobuf::Metadata GetMetadata() const final;\n"
       "\n");
   } else {
     printer->Print(
-      "::std::string GetTypeName() const PROTOBUF_FINAL;\n"
+      "::std::string GetTypeName() const final;\n"
       "\n");
   }
 
@@ -1274,6 +1107,8 @@ GenerateClassDefinition(io::Printer* printer) {
       printer->Print("typedef $nested_full_name$ $nested_name$;\n",
                      "nested_name", nested_type->name(),
                      "nested_full_name", ClassName(nested_type, false));
+      printer->Annotate("nested_full_name", nested_type);
+      printer->Annotate("nested_name", nested_type);
     }
   }
 
@@ -1312,7 +1147,8 @@ GenerateClassDefinition(io::Printer* printer) {
 
 
   for (int i = 0; i < descriptor_->field_count(); i++) {
-    if (!descriptor_->field(i)->is_repeated()) {
+    if (!descriptor_->field(i)->is_repeated() &&
+        !descriptor_->field(i)->options().weak()) {
       // set_has_***() generated in all proto1/2 code and in oneofs (only) for
       // messages without true field presence.
       if (HasFieldPresence(descriptor_->file()) ||
@@ -1335,7 +1171,6 @@ GenerateClassDefinition(io::Printer* printer) {
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     printer->Print(
         "inline bool has_$oneof_name$() const;\n"
-        "void clear_$oneof_name$();\n"
         "inline void clear_has_$oneof_name$();\n\n",
         "oneof_name", descriptor_->oneof_decl(i)->name());
   }
@@ -1353,7 +1188,8 @@ GenerateClassDefinition(io::Printer* printer) {
 
   bool need_to_emit_cached_size = true;
   // TODO(kenton):  Make _cached_size_ an atomic<int> when C++ supports it.
-  const string cached_size_decl = "mutable int _cached_size_;\n";
+  const string cached_size_decl =
+      "mutable ::google::protobuf::internal::CachedSize _cached_size_;\n";
 
   const size_t sizeof_has_bits = HasBitsSize();
   const string has_bits_decl = sizeof_has_bits == 0 ? "" :
@@ -1385,7 +1221,7 @@ GenerateClassDefinition(io::Printer* printer) {
 
   if (SupportsArenas(descriptor_)) {
     printer->Print(
-      "friend class ::google::protobuf::Arena;\n"
+      "template <typename T> friend class ::google::protobuf::Arena::InternalHelper;\n"
       "typedef void InternalArenaConstructable_;\n"
       "typedef void DestructorSkippable_;\n");
   }
@@ -1451,6 +1287,10 @@ GenerateClassDefinition(io::Printer* printer) {
       "\n");
   }
 
+  if (num_weak_fields_) {
+    printer->Print(
+        "::google::protobuf::internal::WeakFieldMap _weak_field_map_;\n");
+  }
   // Generate _any_metadata_ for the Any type.
   if (IsAnyMessage(descriptor_)) {
     printer->Print(vars,
@@ -1459,13 +1299,10 @@ GenerateClassDefinition(io::Printer* printer) {
 
   // The TableStruct struct needs access to the private parts, in order to
   // construct the offsets of all members.
-  // Some InitDefault and Shutdown are defined as static member functions of
-  // TableStruct such that they are also allowed to access private members.
-  printer->Print(
-      "friend struct $dllexport_decl$ $file_namespace$::TableStruct;\n",
-      // Vars.
-      "dllexport_decl", options_.dllexport_decl, "file_namespace",
-      FileLevelNamespace(descriptor_->file()->name()));
+  printer->Print("friend struct ::$file_namespace$::TableStruct;\n",
+                 // Vars.
+                 "scc_name", scc_name_, "file_namespace",
+                 FileLevelNamespace(descriptor_));
 
   printer->Outdent();
   printer->Print("};");
@@ -1473,21 +1310,9 @@ GenerateClassDefinition(io::Printer* printer) {
 }
 
 void MessageGenerator::
-GenerateDependentInlineMethods(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    if (descriptor_->field(i)->options().weak()) {
-      field_generators_.get(descriptor_->field(i))
-          .GenerateDependentInlineAccessorDefinitions(printer);
-    }
-  }
-  GenerateDependentFieldAccessorDefinitions(printer);
-}
-
-void MessageGenerator::
-GenerateInlineMethods(io::Printer* printer, bool is_inline) {
+GenerateInlineMethods(io::Printer* printer) {
   if (IsMapEntryMessage(descriptor_)) return;
-  GenerateFieldAccessorDefinitions(printer, is_inline);
+  GenerateFieldAccessorDefinitions(printer);
 
   // Generate oneof_case() functions.
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
@@ -1497,11 +1322,9 @@ GenerateInlineMethods(io::Printer* printer, bool is_inline) {
         descriptor_->oneof_decl(i)->name(), true);
     vars["oneof_name"] = descriptor_->oneof_decl(i)->name();
     vars["oneof_index"] = SimpleItoa(descriptor_->oneof_decl(i)->index());
-    vars["inline"] = is_inline ? "inline " : "";
     printer->Print(
         vars,
-        "$inline$"
-        "$class_name$::$camel_oneof_name$Case $class_name$::"
+        "inline $class_name$::$camel_oneof_name$Case $class_name$::"
         "$oneof_name$_case() const {\n"
         "  return $class_name$::$camel_oneof_name$Case("
         "_oneof_case_[$oneof_index$]);\n"
@@ -1511,9 +1334,9 @@ GenerateInlineMethods(io::Printer* printer, bool is_inline) {
 
 void MessageGenerator::
 GenerateExtraDefaultFields(io::Printer* printer) {
-  // Generate oneof default instance for reflection usage.
-  if (descriptor_->oneof_decl_count() > 0) {
-    printer->Print("public:\n");
+  // Generate oneof default instance and weak field instances for reflection
+  // usage.
+  if (descriptor_->oneof_decl_count() > 0 || num_weak_fields_ > 0) {
     for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
       for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
         const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
@@ -1525,84 +1348,356 @@ GenerateExtraDefaultFields(io::Printer* printer) {
         field_generators_.get(field).GeneratePrivateMembers(printer);
       }
     }
+    for (int i = 0; i < descriptor_->field_count(); i++) {
+      const FieldDescriptor* field = descriptor_->field(i);
+      if (field->options().weak()) {
+        printer->Print(
+            "  const ::google::protobuf::Message* $name$_;\n", "name", FieldName(field));
+      }
+    }
+  }
+}
+
+bool MessageGenerator::GenerateParseTable(io::Printer* printer, size_t offset,
+                                          size_t aux_offset) {
+  if (!table_driven_) {
+    printer->Print("{ NULL, NULL, 0, -1, -1, -1, -1, NULL, false },\n");
+    return false;
+  }
+
+  std::map<string, string> vars;
+
+  vars["classname"] = ClassName(descriptor_);
+  vars["classtype"] = QualifiedClassName(descriptor_);
+  vars["offset"] = SimpleItoa(offset);
+  vars["aux_offset"] = SimpleItoa(aux_offset);
+
+  int max_field_number = 0;
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = descriptor_->field(i);
+    if (max_field_number < field->number()) {
+      max_field_number = field->number();
+    }
+  }
+
+  vars["max_field_number"] = SimpleItoa(max_field_number);
+
+  printer->Print("{\n");
+  printer->Indent();
+
+  printer->Print(vars,
+      "TableStruct::entries + $offset$,\n"
+      "TableStruct::aux + $aux_offset$,\n"
+      "$max_field_number$,\n");
+
+  if (!HasFieldPresence(descriptor_->file())) {
+    // If we don't have field presence, then _has_bits_ does not exist.
+    printer->Print(vars, "-1,\n");
+  } else {
+    printer->Print(vars,
+                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(\n"
+                   "  $classtype$, _has_bits_),\n");
   }
+
+  if (descriptor_->oneof_decl_count() > 0) {
+    printer->Print(vars,
+                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(\n"
+                   "  $classtype$, _oneof_case_),\n");
+  } else {
+    printer->Print("-1,  // no _oneof_case_\n");
+  }
+
+  if (descriptor_->extension_range_count() > 0) {
+    printer->Print(vars,
+                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classtype$, "
+                   "_extensions_),\n");
+  } else {
+    printer->Print("-1,  // no _extensions_\n");
+  }
+
+  // TODO(ckennelly): Consolidate this with the calculation for
+  // AuxillaryParseTableField.
+  vars["ns"] = Namespace(descriptor_);
+
+  printer->Print(vars,
+                 "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(\n"
+                 "  $classtype$, _internal_metadata_),\n"
+                 "&$ns$::_$classname$_default_instance_,\n");
+
+  if (UseUnknownFieldSet(descriptor_->file(), options_)) {
+    printer->Print(vars, "true,\n");
+  } else {
+    printer->Print(vars, "false,\n");
+  }
+
+  printer->Outdent();
+  printer->Print("},\n");
+  return true;
 }
 
 void MessageGenerator::GenerateSchema(io::Printer* printer, int offset,
                                       int has_offset) {
-  if (IsMapEntryMessage(descriptor_)) return;
-
   std::map<string, string> vars;
 
-  vars["classname"] = classname_;
+  vars["classname"] = QualifiedClassName(descriptor_);
   vars["offset"] = SimpleItoa(offset);
-  vars["has_bits_offsets"] = HasFieldPresence(descriptor_->file())
-                                 ? SimpleItoa(offset + has_offset)
-                                 : "-1";
+  vars["has_bits_offsets"] =
+      HasFieldPresence(descriptor_->file()) || IsMapEntryMessage(descriptor_)
+          ? SimpleItoa(offset + has_offset)
+          : "-1";
 
   printer->Print(vars,
                  "{ $offset$, $has_bits_offsets$, sizeof($classname$)},\n");
 }
 
-void MessageGenerator::
-GenerateTypeRegistrations(io::Printer* printer) {
-  // Register this message type with the message factory.
+namespace {
+
+// TODO(gerbens) remove this after the next sync with GitHub code base.
+// Then the opensource testing has gained the functionality to compile
+// the CalcFieldNum given the symbols defined in generated-message-util.
+#ifdef OPENSOURCE_PROTOBUF_CPP_BOOTSTRAP
+// We need a clean version of CalcFieldNum that doesn't use new functionality
+// in the runtime, because this functionality is not yet in the opensource
+// runtime
+
+uint32 CalculateType(uint32 type, uint32 type_class) {
+  return (type - 1) + type_class * 20;
+}
+
+uint32 CalcFieldNum(const FieldGenerator&, const FieldDescriptor* field,
+                    const Options& options) {
+  bool is_a_map = IsMapEntryMessage(field->containing_type());
+  int type = field->type();
+  if (field->containing_oneof()) {
+    return CalculateType(type, 4);
+  }
+  if (field->is_packed()) {
+    return CalculateType(type, 3);
+  } else if (field->is_repeated()) {
+    return CalculateType(type, 2);
+  } else if (!HasFieldPresence(field->file()) &&
+             field->containing_oneof() == NULL && !is_a_map) {
+    return CalculateType(type, 1);
+  } else {
+    return CalculateType(type, 0);
+  }
+}
+
+#else
+// We need to calculate for each field what function the table driven code
+// should use to serialize it. This returns the index in a lookup table.
+uint32 CalcFieldNum(const FieldGenerator& generator,
+                    const FieldDescriptor* field, const Options& options) {
+  bool is_a_map = IsMapEntryMessage(field->containing_type());
+  int type = field->type();
+  if (type == FieldDescriptor::TYPE_STRING ||
+      type == FieldDescriptor::TYPE_BYTES) {
+    if (generator.IsInlined()) {
+      type = internal::FieldMetadata::kInlinedType;
+    }
+  }
+  if (field->containing_oneof()) {
+    return internal::FieldMetadata::CalculateType(
+        type, internal::FieldMetadata::kOneOf);
+  }
+  if (field->is_packed()) {
+    return internal::FieldMetadata::CalculateType(
+        type, internal::FieldMetadata::kPacked);
+  } else if (field->is_repeated()) {
+    return internal::FieldMetadata::CalculateType(
+        type, internal::FieldMetadata::kRepeated);
+  } else if (!HasFieldPresence(field->file()) &&
+             field->containing_oneof() == NULL && !is_a_map) {
+    return internal::FieldMetadata::CalculateType(
+        type, internal::FieldMetadata::kNoPresence);
+  } else {
+    return internal::FieldMetadata::CalculateType(
+        type, internal::FieldMetadata::kPresence);
+  }
+}
+#endif
+
+int FindMessageIndexInFile(const Descriptor* descriptor) {
+  std::vector<const Descriptor*> flatten =
+      FlattenMessagesInFile(descriptor->file());
+  return std::find(flatten.begin(), flatten.end(), descriptor) -
+         flatten.begin();
+}
+
+}  // namespace
+
+int MessageGenerator::GenerateFieldMetadata(io::Printer* printer) {
+  if (!options_.table_driven_serialization) {
+    return 0;
+  }
+
+  string full_classname = QualifiedClassName(descriptor_);
+
+  std::vector<const FieldDescriptor*> sorted = SortFieldsByNumber(descriptor_);
   if (IsMapEntryMessage(descriptor_)) {
-    std::map<string, string> vars;
-    CollectMapInfo(descriptor_, &vars);
-    vars["classname"] = classname_;
-    vars["file_namespace"] = FileLevelNamespace(descriptor_->file()->name());
+    for (int i = 0; i < 2; i++) {
+      const FieldDescriptor* field = sorted[i];
+      const FieldGenerator& generator = field_generators_.get(field);
 
-    const FieldDescriptor* val = descriptor_->FindFieldByName("value");
-    if (descriptor_->file()->syntax() == FileDescriptor::SYNTAX_PROTO2 &&
-        val->type() == FieldDescriptor::TYPE_ENUM) {
-      const EnumValueDescriptor* default_value = val->default_value_enum();
-      vars["default_enum_value"] = Int32ToString(default_value->number());
-    } else {
-      vars["default_enum_value"] = "0";
+      uint32 tag = internal::WireFormatLite::MakeTag(
+          field->number(), WireFormat::WireTypeForFieldType(field->type()));
+
+      std::map<string, string> vars;
+      vars["classname"] = QualifiedClassName(descriptor_);
+      vars["field_name"] = FieldName(field);
+      vars["tag"] = SimpleItoa(tag);
+      vars["hasbit"] = SimpleItoa(i);
+      vars["type"] = SimpleItoa(CalcFieldNum(generator, field, options_));
+      vars["ptr"] = "NULL";
+      if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+        GOOGLE_CHECK(!IsMapEntryMessage(field->message_type()));
+        {
+          vars["ptr"] =
+              "::" + FileLevelNamespace(field->message_type()) +
+              "::TableStruct::serialization_table + " +
+              SimpleItoa(FindMessageIndexInFile(field->message_type()));
+        }
+      }
+      printer->Print(vars,
+                     "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET("
+                     "::google::protobuf::internal::MapEntryHelper<$classname$::"
+                     "SuperType>, $field_name$_), $tag$,"
+                     "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET("
+                     "::google::protobuf::internal::MapEntryHelper<$classname$::"
+                     "SuperType>, _has_bits_) * 8 + $hasbit$, $type$, "
+                     "$ptr$},\n");
+    }
+    return 2;
+  }
+  printer->Print(
+      "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
+      "_cached_size_), 0, 0, 0, NULL},\n",
+      "classname", full_classname);
+  std::vector<const Descriptor::ExtensionRange*> sorted_extensions;
+  for (int i = 0; i < descriptor_->extension_range_count(); ++i) {
+    sorted_extensions.push_back(descriptor_->extension_range(i));
+  }
+  std::sort(sorted_extensions.begin(), sorted_extensions.end(),
+            ExtensionRangeSorter());
+  for (int i = 0, extension_idx = 0; /* no range */; i++) {
+    for (; extension_idx < sorted_extensions.size() &&
+           (i == sorted.size() ||
+            sorted_extensions[extension_idx]->start < sorted[i]->number());
+         extension_idx++) {
+      const Descriptor::ExtensionRange* range =
+          sorted_extensions[extension_idx];
+      printer->Print(
+          "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
+          "_extensions_), $start$, $end$, "
+          "::google::protobuf::internal::FieldMetadata::kSpecial, "
+          "reinterpret_cast<const "
+          "void*>(::google::protobuf::internal::ExtensionSerializer)},\n",
+          "classname", full_classname, "start", SimpleItoa(range->start), "end",
+          SimpleItoa(range->end));
+    }
+    if (i == sorted.size()) break;
+    const FieldDescriptor* field = sorted[i];
+
+    uint32 tag = internal::WireFormatLite::MakeTag(
+        field->number(), WireFormat::WireTypeForFieldType(field->type()));
+    if (field->is_packed()) {
+      tag = internal::WireFormatLite::MakeTag(
+          field->number(), WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
     }
 
-    vars["index_in_metadata"] = SimpleItoa(index_in_metadata_);
+    string classfieldname = FieldName(field);
+    if (field->containing_oneof()) {
+      classfieldname = field->containing_oneof()->name();
+    }
+    std::map<string, string> vars;
+    vars["classname"] = full_classname;
+    vars["field_name"] = classfieldname;
+    vars["tag"] = SimpleItoa(tag);
+    vars["ptr"] = "NULL";
+    if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+      if (IsMapEntryMessage(field->message_type())) {
+        vars["idx"] = SimpleItoa(FindMessageIndexInFile(field->message_type()));
+        vars["fieldclassname"] = QualifiedClassName(field->message_type());
+        printer->Print(vars,
+                       "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                       "classname$, $field_name$_), $tag$, $idx$, "
+                       "::google::protobuf::internal::FieldMetadata::kSpecial, "
+                       "reinterpret_cast<const void*>(static_cast< "
+                       "::google::protobuf::internal::SpecialSerializer>("
+                       "::google::protobuf::internal::MapFieldSerializer< "
+                       "::google::protobuf::internal::MapEntryToMapField<"
+                       "$fieldclassname$>::MapFieldType, "
+                       "TableStruct::serialization_table>))},\n");
+        continue;
+      } else {
+        vars["ptr"] =
+            "::" + FileLevelNamespace(field->message_type()) +
+            "::TableStruct::serialization_table + " +
+            SimpleItoa(FindMessageIndexInFile(field->message_type()));
+      }
+    }
 
-    printer->Print(
-        vars,
-        "const ::google::protobuf::Descriptor* $classname$_descriptor = "
-        "$file_namespace$::file_level_metadata[$index_in_metadata$].descriptor;"
-        "\n"
-        "::google::protobuf::MessageFactory::InternalRegisterGeneratedMessage(\n"
-        "      $classname$_descriptor,\n"
-        "      ::google::protobuf::internal::MapEntry<\n"
-        "          $key$,\n"
-        "          $val$,\n"
-        "          $key_wire_type$,\n"
-        "          $val_wire_type$,\n"
-        "          $default_enum_value$>::CreateDefaultInstance(\n"
-        "              $classname$_descriptor));\n");
+    const FieldGenerator& generator = field_generators_.get(field);
+    vars["type"] = SimpleItoa(CalcFieldNum(generator, field, options_));
+
+
+    if (field->options().weak()) {
+      // TODO(gerbens) merge weak fields into ranges
+      printer->Print(vars,
+                     "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, _weak_field_map_), $tag$, $tag$, "
+                     "::google::protobuf::internal::FieldMetadata::kSpecial, "
+                     "reinterpret_cast<const "
+                     "void*>(::google::protobuf::internal::WeakFieldSerializer)},\n");
+    } else if (field->containing_oneof()) {
+      vars["oneofoffset"] =
+          SimpleItoa(sizeof(uint32) * field->containing_oneof()->index());
+      printer->Print(vars,
+                     "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, $field_name$_), $tag$, "
+                     "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, _oneof_case_) + $oneofoffset$, "
+                     "$type$, $ptr$},\n");
+    } else if (HasFieldPresence(descriptor_->file()) &&
+               has_bit_indices_[field->index()] != -1) {
+      vars["hasbitsoffset"] = SimpleItoa(has_bit_indices_[field->index()]);
+      printer->Print(vars,
+                     "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, $field_name$_), $tag$, "
+                     "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, _has_bits_) * 8 + $hasbitsoffset$, $type$, "
+                     "$ptr$},\n");
+    } else {
+      printer->Print(vars,
+                     "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($"
+                     "classname$, $field_name$_), $tag$, ~0u, $type$, "
+                     "$ptr$},\n");
+    }
   }
+  int num_field_metadata = 1 + sorted.size() + sorted_extensions.size();
+  num_field_metadata++;
+  string serializer = UseUnknownFieldSet(descriptor_->file(), options_)
+                          ? "::google::protobuf::internal::UnknownFieldSetSerializer"
+                          : "::google::protobuf::internal::UnknownFieldSerializerLite";
+  printer->Print(
+      "{GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
+      "_internal_metadata_), 0, ~0u, "
+      "::google::protobuf::internal::FieldMetadata::kSpecial, reinterpret_cast<const "
+      "void*>($serializer$)},\n",
+      "classname", full_classname, "serializer", serializer);
+  return num_field_metadata;
 }
 
-void MessageGenerator::
-GenerateDefaultInstanceAllocator(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
-
-  // Construct the default instances of all fields, as they will be used
-  // when creating the default instance of the entire message.
+void MessageGenerator::GenerateFieldDefaultInstances(io::Printer* printer) {
+  // Construct the default instances for all fields that need one.
   for (int i = 0; i < descriptor_->field_count(); i++) {
     field_generators_.get(descriptor_->field(i))
                      .GenerateDefaultInstanceAllocator(printer);
   }
-
-  // Construct the default instance.  We can't call InitAsDefaultInstance() yet
-  // because we need to make sure all default instances that this one might
-  // depend on are constructed first.
-  printer->Print("_$classname$_default_instance_.DefaultConstruct();\n",
-                 "classname", classname_);
 }
 
 void MessageGenerator::
 GenerateDefaultInstanceInitializer(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
-
   // The default instance needs all of its embedded message pointers
   // cross-linked to other default instances.  We can't do this initialization
   // in the constructor because some other default instances may not have been
@@ -1617,17 +1712,19 @@ GenerateDefaultInstanceInitializer(io::Printer* printer) {
         (field->containing_oneof() == NULL ||
          HasDescriptorMethods(descriptor_->file(), options_))) {
       string name;
-      if (field->containing_oneof()) {
+      if (field->containing_oneof() || field->options().weak()) {
         name = "_" + classname_ + "_default_instance_.";
       } else {
-        name = "_" + classname_ + "_default_instance_.get_mutable()->";
+        name =
+            "_" + classname_ + "_default_instance_._instance.get_mutable()->";
       }
       name += FieldName(field);
       printer->Print(
-          "$name$_ = const_cast< $type$*>(\n"
+          "$ns$::$name$_ = const_cast< $type$*>(\n"
           "    $type$::internal_default_instance());\n",
           // Vars.
-          "name", name, "type", FieldMessageTypeName(field));
+          "name", name, "type", FieldMessageTypeName(field), "ns",
+          Namespace(descriptor_));
     } else if (field->containing_oneof() &&
                HasDescriptorMethods(descriptor_->file(), options_)) {
       field_generators_.get(descriptor_->field(i))
@@ -1637,27 +1734,42 @@ GenerateDefaultInstanceInitializer(io::Printer* printer) {
 }
 
 void MessageGenerator::
-GenerateShutdownCode(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
-
-  printer->Print("_$classname$_default_instance_.Shutdown();\n", "classname",
-                 classname_);
-
-  if (HasDescriptorMethods(descriptor_->file(), options_)) {
-    printer->Print("delete file_level_metadata[$index$].reflection;\n", "index",
-                   SimpleItoa(index_in_metadata_));
-  }
-
-  // Handle default instances of fields.
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    field_generators_.get(descriptor_->field(i))
-                     .GenerateShutdownCode(printer);
+GenerateClassMethods(io::Printer* printer) {
+  if (IsMapEntryMessage(descriptor_)) {
+    printer->Print(
+        "$classname$::$classname$() {}\n"
+        "$classname$::$classname$(::google::protobuf::Arena* arena) : "
+        "SuperType(arena) {}\n"
+        "void $classname$::MergeFrom(const $classname$& other) {\n"
+        "  MergeFromInternal(other);\n"
+        "}\n",
+        "classname", classname_);
+    if (HasDescriptorMethods(descriptor_->file(), options_)) {
+      printer->Print(
+          "::google::protobuf::Metadata $classname$::GetMetadata() const {\n"
+          "  ::$file_namespace$::protobuf_AssignDescriptorsOnce();\n"
+          "  return ::$file_namespace$::file_level_metadata[$index$];\n"
+          "}\n"
+          "void $classname$::MergeFrom(\n"
+          "    const ::google::protobuf::Message& other) {\n"
+          "  ::google::protobuf::Message::MergeFrom(other);\n"
+          "}\n"
+          "\n",
+          "file_namespace", FileLevelNamespace(descriptor_),
+          "classname", classname_, "index",
+          SimpleItoa(index_in_file_messages_));
+    }
+    return;
   }
-}
 
-void MessageGenerator::
-GenerateClassMethods(io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return;
+  // TODO(gerbens) Remove this function. With a little bit of cleanup and
+  // refactoring this is superfluous.
+  printer->Print("void $classname$::InitAsDefaultInstance() {\n", "classname",
+                 classname_);
+  printer->Indent();
+  GenerateDefaultInstanceInitializer(printer);
+  printer->Outdent();
+  printer->Print("}\n");
 
   if (IsAnyMessage(descriptor_)) {
     printer->Print(
@@ -1673,14 +1785,28 @@ GenerateClassMethods(io::Printer* printer) {
       "bool $classname$::UnpackTo(::google::protobuf::Message* message) const {\n"
       "  return _any_metadata_.UnpackTo(message);\n"
       "}\n"
+      "bool $classname$::ParseAnyTypeUrl(const string& type_url,\n"
+      "                                  string* full_type_name) {\n"
+      "  return ::google::protobuf::internal::ParseAnyTypeUrl(type_url,\n"
+      "                                             full_type_name);\n"
+      "}\n"
       "\n",
       "classname", classname_);
   }
 
   // Generate non-inline field definitions.
   for (int i = 0; i < descriptor_->field_count(); i++) {
-    field_generators_.get(descriptor_->field(i))
+    const FieldDescriptor* field = descriptor_->field(i);
+    field_generators_.get(field)
                      .GenerateNonInlineAccessorDefinitions(printer);
+    if (IsCrossFileMaybeMap(field)) {
+      std::map<string, string> vars;
+      SetCommonFieldVariables(field, &vars, options_);
+      if (field->containing_oneof()) {
+        SetCommonOneofFieldVariables(field, &vars);
+      }
+      GenerateFieldClear(field, vars, false, printer);
+    }
   }
 
   // Generate field number constants.
@@ -1735,15 +1861,26 @@ GenerateClassMethods(io::Printer* printer) {
   GenerateSwap(printer);
   printer->Print("\n");
 
+  if (options_.table_driven_serialization) {
+    printer->Print(
+        "const void* $classname$::InternalGetTable() const {\n"
+        "  return ::$file_namespace$::TableStruct::serialization_table + "
+        "$index$;\n"
+        "}\n"
+        "\n",
+        "classname", classname_, "index", SimpleItoa(index_in_file_messages_),
+        "file_namespace", FileLevelNamespace(descriptor_));
+  }
   if (HasDescriptorMethods(descriptor_->file(), options_)) {
     printer->Print(
         "::google::protobuf::Metadata $classname$::GetMetadata() const {\n"
         "  $file_namespace$::protobuf_AssignDescriptorsOnce();\n"
-        "  return $file_namespace$::file_level_metadata[$index$];\n"
+        "  return ::"
+        "$file_namespace$::file_level_metadata[kIndexInFileMessages];\n"
         "}\n"
         "\n",
-        "classname", classname_, "index", SimpleItoa(index_in_metadata_),
-        "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
+        "classname", classname_, "file_namespace",
+        FileLevelNamespace(descriptor_));
   } else {
     printer->Print(
       "::std::string $classname$::GetTypeName() const {\n"
@@ -1756,16 +1893,197 @@ GenerateClassMethods(io::Printer* printer) {
 
 }
 
+size_t MessageGenerator::GenerateParseOffsets(io::Printer* printer) {
+  if (!table_driven_) {
+    return 0;
+  }
+
+  // Field "0" is special:  We use it in our switch statement of processing
+  // types to handle the successful end tag case.
+  printer->Print("{0, 0, 0, ::google::protobuf::internal::kInvalidMask, 0, 0},\n");
+  int last_field_number = 1;
+
+  std::vector<const FieldDescriptor*> ordered_fields =
+      SortFieldsByNumber(descriptor_);
+
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = ordered_fields[i];
+    GOOGLE_CHECK_GE(field->number(), last_field_number);
+
+    for (; last_field_number < field->number(); last_field_number++) {
+      printer->Print(
+          "{ 0, 0, ::google::protobuf::internal::kInvalidMask,\n"
+          "  ::google::protobuf::internal::kInvalidMask, 0, 0 },\n");
+    }
+    last_field_number++;
+
+    unsigned char normal_wiretype, packed_wiretype, processing_type;
+    normal_wiretype = WireFormat::WireTypeForFieldType(field->type());
+
+    if (field->is_packable()) {
+      packed_wiretype = WireFormatLite::WIRETYPE_LENGTH_DELIMITED;
+    } else {
+      packed_wiretype = internal::kNotPackedMask;
+    }
+
+    processing_type = static_cast<unsigned>(field->type());
+    const FieldGenerator& generator = field_generators_.get(field);
+    if (field->type() == FieldDescriptor::TYPE_STRING) {
+      switch (EffectiveStringCType(field)) {
+        case FieldOptions::STRING:
+        default: {
+          if (generator.IsInlined()) {
+            processing_type = internal::TYPE_STRING_INLINED;
+            break;
+          }
+          break;
+        }
+      }
+    } else if (field->type() == FieldDescriptor::TYPE_BYTES) {
+      switch (EffectiveStringCType(field)) {
+        case FieldOptions::STRING:
+        default:
+          if (generator.IsInlined()) {
+            processing_type = internal::TYPE_BYTES_INLINED;
+            break;
+          }
+          break;
+      }
+    }
+
+    processing_type |= static_cast<unsigned>(
+        field->is_repeated() ?  internal::kRepeatedMask : 0);
+    processing_type |= static_cast<unsigned>(
+        field->containing_oneof() ? internal::kOneofMask : 0);
+
+    if (field->is_map()) {
+      processing_type = internal::TYPE_MAP;
+    }
+
+    const unsigned char tag_size =
+      WireFormat::TagSize(field->number(), field->type());
+
+    std::map<string, string> vars;
+    vars["classname"] = QualifiedClassName(descriptor_);
+    if (field->containing_oneof() != NULL) {
+      vars["name"] = field->containing_oneof()->name();
+      vars["presence"] = SimpleItoa(field->containing_oneof()->index());
+    } else {
+      vars["name"] = FieldName(field);
+      vars["presence"] = SimpleItoa(has_bit_indices_[field->index()]);
+    }
+    vars["nwtype"] = SimpleItoa(normal_wiretype);
+    vars["pwtype"] = SimpleItoa(packed_wiretype);
+    vars["ptype"] = SimpleItoa(processing_type);
+    vars["tag_size"] = SimpleItoa(tag_size);
+
+    printer->Print(vars,
+      "{\n"
+      "  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(\n"
+      "    $classname$, $name$_),\n"
+      "  static_cast<::google::protobuf::uint32>($presence$),\n"
+      "  $nwtype$, $pwtype$, $ptype$, $tag_size$\n"
+      "},\n");
+  }
+
+  return last_field_number;
+}
+
+size_t MessageGenerator::GenerateParseAuxTable(io::Printer* printer) {
+  if (!table_driven_) {
+    return 0;
+  }
+
+  std::vector<const FieldDescriptor*> ordered_fields =
+      SortFieldsByNumber(descriptor_);
+
+  printer->Print("::google::protobuf::internal::AuxillaryParseTableField(),\n");
+  int last_field_number = 1;
+  for (int i = 0; i < descriptor_->field_count(); i++) {
+    const FieldDescriptor* field = ordered_fields[i];
+
+    GOOGLE_CHECK_GE(field->number(), last_field_number);
+    for (; last_field_number < field->number(); last_field_number++) {
+      printer->Print("::google::protobuf::internal::AuxillaryParseTableField(),\n");
+    }
+
+    std::map<string, string> vars;
+    SetCommonFieldVariables(field, &vars, options_);
+
+    switch (field->cpp_type()) {
+      case FieldDescriptor::CPPTYPE_ENUM:
+        vars["type"] = ClassName(field->enum_type(), true);
+        printer->Print(
+            vars,
+            "{::google::protobuf::internal::AuxillaryParseTableField::enum_aux{"
+            "$type$_IsValid}},\n");
+        last_field_number++;
+        break;
+      case FieldDescriptor::CPPTYPE_MESSAGE: {
+        if (field->is_map()) {
+          vars["classname"] = QualifiedClassName(field->message_type());
+          printer->Print(vars,
+                         "{::google::protobuf::internal::AuxillaryParseTableField::map_"
+                         "aux{&::google::protobuf::internal::ParseMap<$classname$>}},\n");
+          last_field_number++;
+          break;
+        } else {
+          vars["classname"] = ClassName(field->message_type(), false);
+        }
+        vars["ns"] = Namespace(field->message_type());
+        vars["type"] = FieldMessageTypeName(field);
+        vars["file_namespace"] =
+            FileLevelNamespace(field->message_type());
+
+        printer->Print(
+            vars,
+            "{::google::protobuf::internal::AuxillaryParseTableField::message_aux{\n"
+            "  &$ns$::_$classname$_default_instance_}},\n");
+        last_field_number++;
+        break;
+      }
+      case FieldDescriptor::CPPTYPE_STRING:
+        switch (EffectiveStringCType(field)) {
+          case FieldOptions::STRING:
+            vars["default"] =
+                field->default_value_string().empty()
+                    ? "&::google::protobuf::internal::fixed_address_empty_string"
+                    : "&" + Namespace(field) + " ::" + classname_ +
+                          "::" + MakeDefaultName(field);
+            break;
+          case FieldOptions::CORD:
+          case FieldOptions::STRING_PIECE:
+            vars["default"] =
+                "\"" + CEscape(field->default_value_string()) + "\"";
+            break;
+        }
+        vars["full_name"] = field->full_name();
+        printer->Print(vars,
+            "{::google::protobuf::internal::AuxillaryParseTableField::string_aux{\n"
+            "  $default$,\n"
+            "  \"$full_name$\"\n"
+            "}},\n");
+        last_field_number++;
+        break;
+      default:
+        break;
+    }
+  }
+
+  return last_field_number;
+}
+
 std::pair<size_t, size_t> MessageGenerator::GenerateOffsets(
     io::Printer* printer) {
-  if (IsMapEntryMessage(descriptor_)) return std::make_pair(0, 0);
   std::map<string, string> variables;
-  variables["classname"] = classname_;
+  string full_classname = QualifiedClassName(descriptor_);
+  variables["classname"] = full_classname;
 
-  if (HasFieldPresence(descriptor_->file())) {
+  if (HasFieldPresence(descriptor_->file()) || IsMapEntryMessage(descriptor_)) {
     printer->Print(
         variables,
-        "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, _has_bits_),\n");
+        "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
+        "_has_bits_),\n");
   } else {
     printer->Print("~0u,  // no _has_bits_\n");
   }
@@ -1775,48 +2093,62 @@ std::pair<size_t, size_t> MessageGenerator::GenerateOffsets(
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
         variables,
-        "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, _extensions_),\n");
+        "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
+        "_extensions_),\n");
   } else {
     printer->Print("~0u,  // no _extensions_\n");
   }
   if (descriptor_->oneof_decl_count() > 0) {
     printer->Print(variables,
-                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
-                   "_oneof_case_[0]),\n");
+                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET("
+                   "$classname$, _oneof_case_[0]),\n");
   } else {
     printer->Print("~0u,  // no _oneof_case_\n");
   }
-
-  const int kNumGenericOffsets = 4;  // the number of fixed offsets above
+  if (num_weak_fields_ > 0) {
+    printer->Print(variables,
+                   "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$,"
+                   " _weak_field_map_),\n");
+  } else {
+    printer->Print("~0u,  // no _weak_field_map_\n");
+  }
+  const int kNumGenericOffsets = 5;  // the number of fixed offsets above
   const size_t offsets = kNumGenericOffsets +
                          descriptor_->field_count() +
                          descriptor_->oneof_decl_count();
   size_t entries = offsets;
   for (int i = 0; i < descriptor_->field_count(); i++) {
     const FieldDescriptor* field = descriptor_->field(i);
-    if (field->containing_oneof()) {
-      printer->Print(
-          "PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET("
-          "(&_$classname$_default_instance_), $name$_),\n",
-          "classname", classname_, "name", FieldName(field));
+    if (field->containing_oneof() || field->options().weak()) {
+      printer->Print("offsetof($classname$DefaultTypeInternal, $name$_)",
+                     "classname", full_classname, "name", FieldName(field));
     } else {
       printer->Print(
-          "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, "
-                                                 "$name$_),\n",
-          "classname", classname_,
-          "name", FieldName(field));
+          "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, $name$_)",
+          "classname", full_classname, "name", FieldName(field));
     }
+
+    uint32 tag = field_generators_.get(field).CalculateFieldTag();
+    if (tag != 0) {
+      printer->Print(" | $tag$", "tag", SimpleItoa(tag));
+    }
+
+    printer->Print(",\n");
   }
 
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
     const OneofDescriptor* oneof = descriptor_->oneof_decl(i);
     printer->Print(
-      "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, $name$_),\n",
-      "classname", classname_,
-      "name", oneof->name());
+        "GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, $name$_),\n",
+        "classname", full_classname, "name", oneof->name());
   }
 
-  if (HasFieldPresence(descriptor_->file())) {
+  if (IsMapEntryMessage(descriptor_)) {
+    entries += 2;
+    printer->Print(
+        "0,\n"
+        "1,\n");
+  } else if (HasFieldPresence(descriptor_->file())) {
     entries += has_bit_indices_.size();
     for (int i = 0; i < has_bit_indices_.size(); i++) {
       const string index = has_bit_indices_[i] >= 0 ?
@@ -1835,28 +2167,6 @@ GenerateSharedConstructorCode(io::Printer* printer) {
     "classname", classname_);
   printer->Indent();
 
-  bool need_to_clear_cached_size = true;
-  // We reproduce the logic used for laying out _cached_sized_ in the class
-  // definition, as to initialize it in-order.
-  if (HasFieldPresence(descriptor_->file()) &&
-      (HasBitsSize() % 8) != 0) {
-    printer->Print("_cached_size_ = 0;\n");
-    need_to_clear_cached_size = false;
-  }
-
-  // TODO(gerbens) Clean this hack, and why do i need a reference to a pointer??
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-    if (HasDescriptorMethods(descriptor_->file(), options_) &&
-        IsMapEntryMessage(descriptor_->nested_type(i))) {
-      printer->Print(
-          "const ::google::protobuf::Descriptor*& $type$_descriptor = "
-          "$file_namespace$::file_level_metadata[$index$].descriptor;\n",
-          "type", ClassName(descriptor_->nested_type(i), false), "index",
-          SimpleItoa(nested_generators_[i]->index_in_metadata_),
-          "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
-    }
-  }
-
   std::vector<bool> processed(optimized_order_.size(), false);
   GenerateConstructorBody(printer, processed, false);
 
@@ -1866,10 +2176,6 @@ GenerateSharedConstructorCode(io::Printer* printer) {
         "oneof_name", descriptor_->oneof_decl(i)->name());
   }
 
-  if (need_to_clear_cached_size) {
-    printer->Print("_cached_size_ = 0;\n");
-  }
-
   printer->Outdent();
   printer->Print("}\n\n");
 }
@@ -1881,15 +2187,9 @@ GenerateSharedDestructorCode(io::Printer* printer) {
     "classname", classname_);
   printer->Indent();
   if (SupportsArenas(descriptor_)) {
-    // Do nothing when the message is allocated in an arena.
     printer->Print(
-      "::google::protobuf::Arena* arena = GetArenaNoVirtual();\n"
-      "if (arena != NULL) {\n"
-      "  return;\n"
-      "}\n"
-      "\n");
+      "GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);\n");
   }
-
   // Write the destructors for each field except oneof members.
   // optimized_order_ does not contain oneof fields.
   for (int i = 0; i < optimized_order_.size(); i++) {
@@ -1906,6 +2206,9 @@ GenerateSharedDestructorCode(io::Printer* printer) {
         "oneof_name", descriptor_->oneof_decl(i)->name());
   }
 
+  if (num_weak_fields_) {
+    printer->Print("_weak_field_map_.ClearAll();\n");
+  }
   printer->Outdent();
   printer->Print(
     "}\n"
@@ -1956,6 +2259,12 @@ GenerateArenaDestructorCode(io::Printer* printer) {
       }
     }
   }
+  if (num_weak_fields_) {
+    // _this is the object being destructed (we are inside a static method
+    // here).
+    printer->Print("_this->_weak_field_map_.ClearAll();\n");
+    need_registration = true;
+  }
 
   printer->Outdent();
   printer->Print(
@@ -1971,7 +2280,7 @@ GenerateArenaDestructorCode(io::Printer* printer) {
         "classname", classname_);
   } else {
     printer->Print(
-        "void $classname$::RegisterArenaDtor(::google::protobuf::Arena* arena) {\n"
+        "void $classname$::RegisterArenaDtor(::google::protobuf::Arena*) {\n"
         "}\n",
         "classname", classname_);
   }
@@ -2005,12 +2314,13 @@ void MessageGenerator::GenerateConstructorBody(io::Printer* printer,
   if (copy_constructor) {
     pod_template =
         "::memcpy(&$first$_, &from.$first$_,\n"
-        "  reinterpret_cast<char*>(&$last$_) -\n"
-        "  reinterpret_cast<char*>(&$first$_) + sizeof($last$_));\n";
+        "  static_cast<size_t>(reinterpret_cast<char*>(&$last$_) -\n"
+        "  reinterpret_cast<char*>(&$first$_)) + sizeof($last$_));\n";
   } else {
     pod_template =
-        "::memset(&$first$_, 0, reinterpret_cast<char*>(&$last$_) -\n"
-        "  reinterpret_cast<char*>(&$first$_) + sizeof($last$_));\n";
+        "::memset(&$first$_, 0, static_cast<size_t>(\n"
+        "    reinterpret_cast<char*>(&$last$_) -\n"
+        "    reinterpret_cast<char*>(&$first$_)) + sizeof($last$_));\n";
   }
 
   for (int i = 0; i < optimized_order_.size(); ++i) {
@@ -2049,12 +2359,7 @@ void MessageGenerator::GenerateConstructorBody(io::Printer* printer,
 void MessageGenerator::
 GenerateStructors(io::Printer* printer) {
   string superclass;
-  if (use_dependent_base_) {
-    superclass =
-        DependentBaseClassTemplateName(descriptor_) + "<" + classname_ + ">";
-  } else {
-    superclass = SuperClassName(descriptor_, options_);
-  }
+  superclass = SuperClassName(descriptor_, options_);
   string initializer_with_arena = superclass + "()";
 
   if (descriptor_->extension_range_count() > 0) {
@@ -2077,161 +2382,152 @@ GenerateStructors(io::Printer* printer) {
   if (IsAnyMessage(descriptor_)) {
     initializer_with_arena += ",\n  _any_metadata_(&type_url_, &value_)";
   }
+  if (num_weak_fields_ > 0) {
+    initializer_with_arena += ", _weak_field_map_(arena)";
+  }
 
-  string initializer_null;
-  initializer_null = ", _internal_metadata_(NULL)";
+  string initializer_null = superclass + "(), _internal_metadata_(NULL)";
   if (IsAnyMessage(descriptor_)) {
     initializer_null += ", _any_metadata_(&type_url_, &value_)";
   }
+  if (num_weak_fields_ > 0) {
+    initializer_null += ", _weak_field_map_(nullptr)";
+  }
 
   printer->Print(
       "$classname$::$classname$()\n"
-      "  : $superclass$()$initializer$ {\n"
-      "  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {\n"
-      "    $file_namespace$::InitDefaults();\n"
-      "  }\n"
+      "  : $initializer$ {\n"
+      "  ::google::protobuf::internal::InitSCC(\n"
+      "      &$file_namespace$::scc_info_$scc_name$.base);\n"
       "  SharedCtor();\n"
       "  // @@protoc_insertion_point(constructor:$full_name$)\n"
       "}\n",
-      "classname", classname_, "superclass", superclass, "full_name",
-      descriptor_->full_name(), "initializer", initializer_null,
-      "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
+      "classname", classname_, "full_name", descriptor_->full_name(),
+      "scc_name", scc_name_, "initializer", initializer_null, "file_namespace",
+      FileLevelNamespace(descriptor_));
 
   if (SupportsArenas(descriptor_)) {
     printer->Print(
         "$classname$::$classname$(::google::protobuf::Arena* arena)\n"
         "  : $initializer$ {\n"
-        // When arenas are used it's safe to assume we have finished
-        // static init time (protos with arenas are unsafe during static init)
-        "#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER\n"
-        "  $file_namespace$::InitDefaults();\n"
-        "#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER\n"
+        "  "
+        "::google::protobuf::internal::InitSCC(&$file_namespace$::scc_info_$scc_name$."
+        "base);\n"
         "  SharedCtor();\n"
         "  RegisterArenaDtor(arena);\n"
         "  // @@protoc_insertion_point(arena_constructor:$full_name$)\n"
         "}\n",
         "initializer", initializer_with_arena, "classname", classname_,
         "superclass", superclass, "full_name", descriptor_->full_name(),
-        "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
+        "scc_name", scc_name_, "file_namespace",
+        FileLevelNamespace(descriptor_));
   }
 
   // Generate the copy constructor.
-  printer->Print(
-    "$classname$::$classname$(const $classname$& from)\n"
-    "  : $superclass$()",
-    "classname", classname_,
-    "superclass", superclass,
-    "full_name", descriptor_->full_name());
-  printer->Indent();
-  printer->Indent();
-  printer->Indent();
-
-  printer->Print(
-      ",\n_internal_metadata_(NULL)");
-
-  if (HasFieldPresence(descriptor_->file())) {
-      printer->Print(",\n_has_bits_(from._has_bits_)");
-  }
-
-  bool need_to_emit_cached_size = true;
-  const string cached_size_decl = ",\n_cached_size_(0)";
-  // We reproduce the logic used for laying out _cached_sized_ in the class
-  // definition, as to initialize it in-order.
-  if (HasFieldPresence(descriptor_->file()) &&
-      (HasBitsSize() % 8) != 0) {
-    printer->Print(cached_size_decl.c_str());
-    need_to_emit_cached_size = false;
-  }
+  if (UsingImplicitWeakFields(descriptor_->file(), options_)) {
+    // If we are in lite mode and using implicit weak fields, we generate a
+    // one-liner copy constructor that delegates to MergeFrom. This saves some
+    // code size and also cuts down on the complexity of implicit weak fields.
+    // We might eventually want to do this for all lite protos.
+    printer->Print(
+      "$classname$::$classname$(const $classname$& from)\n"
+      "  : $classname$() {\n"
+      "  MergeFrom(from);\n"
+      "}\n",
+      "classname", classname_);
+  } else {
+    printer->Print(
+      "$classname$::$classname$(const $classname$& from)\n"
+      "  : $superclass$()",
+      "classname", classname_,
+      "superclass", superclass,
+      "full_name", descriptor_->full_name());
+    printer->Indent();
+    printer->Indent();
+    printer->Indent();
 
-  std::vector<bool> processed(optimized_order_.size(), false);
-  for (int i = 0; i < optimized_order_.size(); ++i) {
-    const FieldDescriptor* field = optimized_order_[i];
+    printer->Print(
+        ",\n_internal_metadata_(NULL)");
 
-    if (!(field->is_repeated() && !(field->is_map()))
-        ) {
-      continue;
+    if (HasFieldPresence(descriptor_->file())) {
+        printer->Print(",\n_has_bits_(from._has_bits_)");
     }
 
-    processed[i] = true;
-    printer->Print(",\n$name$_(from.$name$_)",
-                   "name", FieldName(field));
-  }
+    std::vector<bool> processed(optimized_order_.size(), false);
+    for (int i = 0; i < optimized_order_.size(); ++i) {
+      const FieldDescriptor* field = optimized_order_[i];
 
-  if (need_to_emit_cached_size) {
-    printer->Print(cached_size_decl.c_str());
-    need_to_emit_cached_size = false;
-  }
+      if (!(field->is_repeated() && !(field->is_map()))
+          ) {
+        continue;
+      }
 
-  if (IsAnyMessage(descriptor_)) {
-    printer->Print(",\n_any_metadata_(&type_url_, &value_)");
-  }
+      processed[i] = true;
+      printer->Print(",\n$name$_(from.$name$_)",
+                     "name", FieldName(field));
+    }
 
-  printer->Outdent();
-  printer->Outdent();
-  printer->Print(" {\n");
+    if (IsAnyMessage(descriptor_)) {
+      printer->Print(",\n_any_metadata_(&type_url_, &value_)");
+    }
+    if (num_weak_fields_ > 0) {
+      printer->Print(",\n_weak_field_map_(from._weak_field_map_)");
+    }
 
-  printer->Print(
-      "_internal_metadata_.MergeFrom(from._internal_metadata_);\n");
+    printer->Outdent();
+    printer->Outdent();
+    printer->Print(" {\n");
 
-  if (descriptor_->extension_range_count() > 0) {
-    printer->Print("_extensions_.MergeFrom(from._extensions_);\n");
-  }
+    printer->Print(
+        "_internal_metadata_.MergeFrom(from._internal_metadata_);\n");
 
-  // TODO(gerbens) Clean this hack, and why do i need a reference to a pointer??
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-    if (HasDescriptorMethods(descriptor_->file(), options_) &&
-        IsMapEntryMessage(descriptor_->nested_type(i))) {
-      printer->Print(
-          "const ::google::protobuf::Descriptor*& $type$_descriptor = "
-          "$file_namespace$::file_level_metadata[$index$].descriptor;\n",
-          "type", ClassName(descriptor_->nested_type(i), false), "index",
-          SimpleItoa(nested_generators_[i]->index_in_metadata_),
-          "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
+    if (descriptor_->extension_range_count() > 0) {
+      printer->Print("_extensions_.MergeFrom(from._extensions_);\n");
     }
-  }
 
-  GenerateConstructorBody(printer, processed, true);
+    GenerateConstructorBody(printer, processed, true);
 
-  // Copy oneof fields. Oneof field requires oneof case check.
-  for (int i = 0; i < descriptor_->oneof_decl_count(); ++i) {
-    printer->Print(
-        "clear_has_$oneofname$();\n"
-        "switch (from.$oneofname$_case()) {\n",
-        "oneofname", descriptor_->oneof_decl(i)->name());
-    printer->Indent();
-    for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
-      const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
+    // Copy oneof fields. Oneof field requires oneof case check.
+    for (int i = 0; i < descriptor_->oneof_decl_count(); ++i) {
       printer->Print(
-          "case k$field_name$: {\n",
-          "field_name", UnderscoresToCamelCase(field->name(), true));
+          "clear_has_$oneofname$();\n"
+          "switch (from.$oneofname$_case()) {\n",
+          "oneofname", descriptor_->oneof_decl(i)->name());
       printer->Indent();
-      field_generators_.get(field).GenerateMergingCode(printer);
+      for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
+        const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
+        printer->Print(
+            "case k$field_name$: {\n",
+            "field_name", UnderscoresToCamelCase(field->name(), true));
+        printer->Indent();
+        field_generators_.get(field).GenerateMergingCode(printer);
+        printer->Print(
+            "break;\n");
+        printer->Outdent();
+        printer->Print(
+            "}\n");
+      }
       printer->Print(
-          "break;\n");
+          "case $cap_oneof_name$_NOT_SET: {\n"
+          "  break;\n"
+          "}\n",
+          "oneof_index",
+          SimpleItoa(descriptor_->oneof_decl(i)->index()),
+          "cap_oneof_name",
+          ToUpper(descriptor_->oneof_decl(i)->name()));
       printer->Outdent();
       printer->Print(
           "}\n");
     }
-    printer->Print(
-        "case $cap_oneof_name$_NOT_SET: {\n"
-        "  break;\n"
-        "}\n",
-        "oneof_index",
-        SimpleItoa(descriptor_->oneof_decl(i)->index()),
-        "cap_oneof_name",
-        ToUpper(descriptor_->oneof_decl(i)->name()));
+
     printer->Outdent();
     printer->Print(
-        "}\n");
+      "  // @@protoc_insertion_point(copy_constructor:$full_name$)\n"
+      "}\n"
+      "\n",
+      "full_name", descriptor_->full_name());
   }
 
-  printer->Outdent();
-  printer->Print(
-    "  // @@protoc_insertion_point(copy_constructor:$full_name$)\n"
-    "}\n"
-    "\n",
-    "full_name", descriptor_->full_name());
-
   // Generate the shared constructor code.
   GenerateSharedConstructorCode(printer);
 
@@ -2255,52 +2551,46 @@ GenerateStructors(io::Printer* printer) {
 
   // Generate SetCachedSize.
   printer->Print(
-    "void $classname$::SetCachedSize(int size) const {\n"
-    "  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();\n"
-    "  _cached_size_ = size;\n"
-    "  GOOGLE_SAFE_CONCURRENT_WRITES_END();\n"
-    "}\n",
-    "classname", classname_);
+      "void $classname$::SetCachedSize(int size) const {\n"
+      "  _cached_size_.Set(size);\n"
+      "}\n",
+      "classname", classname_);
 
   // Only generate this member if it's not disabled.
   if (HasDescriptorMethods(descriptor_->file(), options_) &&
       !descriptor_->options().no_standard_descriptor_accessor()) {
     printer->Print(
         "const ::google::protobuf::Descriptor* $classname$::descriptor() {\n"
-        "  $file_namespace$::protobuf_AssignDescriptorsOnce();\n"
-        "  return $file_namespace$::file_level_metadata[$index$].descriptor;\n"
+        "  ::$file_namespace$::protobuf_AssignDescriptorsOnce();\n"
+        "  return ::"
+        "$file_namespace$::file_level_metadata[kIndexInFileMessages]."
+        "descriptor;\n"
         "}\n"
         "\n",
-        "index", SimpleItoa(index_in_metadata_), "classname", classname_,
-        "file_namespace", FileLevelNamespace(descriptor_->file()->name()));
+        "classname", classname_, "file_namespace",
+        FileLevelNamespace(descriptor_));
   }
 
   printer->Print(
       "const $classname$& $classname$::default_instance() {\n"
-      "  $file_namespace$::InitDefaults();\n"
+      "  "
+      "::google::protobuf::internal::InitSCC(&$file_namespace$::scc_info_$scc_name$.base)"
+      ";\n"
       "  return *internal_default_instance();\n"
       "}\n\n",
-      "classname", classname_, "file_namespace",
-      FileLevelNamespace(descriptor_->file()->name()));
+      "classname", classname_, "scc_name", scc_name_, "file_namespace",
+      FileLevelNamespace(descriptor_));
+}
 
-  if (SupportsArenas(descriptor_)) {
-    printer->Print(
-      "$classname$* $classname$::New(::google::protobuf::Arena* arena) const {\n"
-      "  return ::google::protobuf::Arena::CreateMessage<$classname$>(arena);\n"
-      "}\n",
-      "classname", classname_);
-  } else {
-    printer->Print(
-      "$classname$* $classname$::New(::google::protobuf::Arena* arena) const {\n"
-      "  $classname$* n = new $classname$;\n"
-      "  if (arena != NULL) {\n"
-      "    arena->Own(n);\n"
-      "  }\n"
-      "  return n;\n"
+void MessageGenerator::GenerateSourceInProto2Namespace(io::Printer* printer) {
+  printer->Print(
+      "template<> "
+      "GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE "
+      "$classname$* Arena::CreateMaybeMessage< $classname$ >(Arena* arena) {\n"
+      "  return Arena::$create_func$Internal< $classname$ >(arena);\n"
       "}\n",
-      "classname", classname_);
-  }
-
+      "classname", QualifiedClassName(descriptor_),
+      "create_func", MessageCreateFunction(descriptor_));
 }
 
 // Return the number of bits set in n, a non-negative integer.
@@ -2313,188 +2603,214 @@ static int popcnt(uint32 n) {
   return result;
 }
 
+bool MessageGenerator::MaybeGenerateOptionalFieldCondition(
+    io::Printer* printer, const FieldDescriptor* field,
+    int expected_has_bits_index) {
+  int has_bit_index = has_bit_indices_[field->index()];
+  if (!field->options().weak() &&
+      expected_has_bits_index == has_bit_index / 32) {
+    const string mask =
+        StrCat(strings::Hex(1u << (has_bit_index % 32), strings::ZERO_PAD_8));
+    printer->Print(
+        "if (cached_has_bits & 0x$mask$u) {\n",
+        "mask", mask);
+    return true;
+  }
+  return false;
+}
+
 void MessageGenerator::
 GenerateClear(io::Printer* printer) {
+  // Performance tuning parameters
+  const int kMaxUnconditionalPrimitiveBytesClear = 4;
+
   printer->Print(
       "void $classname$::Clear() {\n"
       "// @@protoc_insertion_point(message_clear_start:$full_name$)\n",
       "classname", classname_, "full_name", descriptor_->full_name());
   printer->Indent();
 
+  printer->Print(
+      // TODO(jwb): It would be better to avoid emitting this if it is not used,
+      // rather than emitting a workaround for the resulting warning.
+      "::google::protobuf::uint32 cached_has_bits = 0;\n"
+      "// Prevent compiler warnings about cached_has_bits being unused\n"
+      "(void) cached_has_bits;\n\n");
+
+  int cached_has_bit_index = -1;
+
   // Step 1: Extensions
   if (descriptor_->extension_range_count() > 0) {
     printer->Print("_extensions_.Clear();\n");
   }
 
-  int last_i = -1;
-  for (int i = 0; i < optimized_order_.size(); ) {
-    // Detect infinite loops.
-    GOOGLE_CHECK_NE(i, last_i);
-    last_i = i;
-
-    // Step 2: Repeated fields don't use _has_bits_; emit code to clear them
-    // here.
-    for (; i < optimized_order_.size(); i++) {
-      const FieldDescriptor* field = optimized_order_[i];
-      const FieldGenerator& generator = field_generators_.get(field);
-
-      if (!field->is_repeated()) {
-        break;
-      }
+  int unconditional_budget = kMaxUnconditionalPrimitiveBytesClear;
+  for (int i = 0; i < optimized_order_.size(); i++) {
+    const FieldDescriptor* field = optimized_order_[i];
 
-      if (use_dependent_base_ && IsFieldDependent(field)) {
-        printer->Print("clear_$name$();\n", "name", FieldName(field));
-      } else {
-        generator.GenerateMessageClearingCode(printer);
-      }
+    if (!CanInitializeByZeroing(field)) {
+      continue;
     }
 
-    // Step 3: Greedily seek runs of fields that can be cleared by
-    // memset-to-0.
-    int last_chunk = -1;
-    int last_chunk_start = -1;
-    int last_chunk_end = -1;
-    uint32 last_chunk_mask = 0;
+    unconditional_budget -= EstimateAlignmentSize(field);
+  }
 
-    int memset_run_start = -1;
-    int memset_run_end = -1;
-    for (; i < optimized_order_.size(); i++) {
-      const FieldDescriptor* field = optimized_order_[i];
+  std::vector<std::vector<const FieldDescriptor*> > chunks_frag = CollectFields(
+      optimized_order_,
+      MatchRepeatedAndHasByteAndZeroInits(
+          &has_bit_indices_, HasFieldPresence(descriptor_->file())));
 
-      if (!CanInitializeByZeroing(field)) {
-        break;
+  // Merge next non-zero initializable chunk if it has the same has_byte index
+  // and not meeting unconditional clear condition.
+  std::vector<std::vector<const FieldDescriptor*> > chunks;
+  if (!HasFieldPresence(descriptor_->file())) {
+    // Don't bother with merging without has_bit field.
+    chunks = chunks_frag;
+  } else {
+    // Note that only the next chunk is considered for merging.
+    for (int i = 0; i < chunks_frag.size(); i++) {
+      chunks.push_back(chunks_frag[i]);
+      const FieldDescriptor* field = chunks_frag[i].front();
+      const FieldDescriptor* next_field =
+          (i + 1) < chunks_frag.size() ? chunks_frag[i + 1].front() : nullptr;
+      if (CanInitializeByZeroing(field) &&
+          (chunks_frag[i].size() == 1 || unconditional_budget < 0) &&
+          next_field != nullptr &&
+          has_bit_indices_[field->index()] / 8 ==
+              has_bit_indices_[next_field->index()] / 8) {
+        GOOGLE_CHECK(!CanInitializeByZeroing(next_field));
+        // Insert next chunk to the current one and skip next chunk.
+        chunks.back().insert(chunks.back().end(), chunks_frag[i + 1].begin(),
+                             chunks_frag[i + 1].end());
+        i++;
       }
+    }
+  }
 
-      // "index" defines where in the _has_bits_ the field appears.
-      // "i" is our loop counter within optimized_order_.
-      int index = HasFieldPresence(descriptor_->file()) ?
-          has_bit_indices_[field->index()] : 0;
-      int chunk = index / 8;
+  for (int chunk_index = 0; chunk_index < chunks.size(); chunk_index++) {
+    std::vector<const FieldDescriptor*>& chunk = chunks[chunk_index];
+    GOOGLE_CHECK(!chunk.empty());
 
-      if (last_chunk == -1) {
-        last_chunk = chunk;
-        last_chunk_start = i;
-      } else if (chunk != last_chunk) {
-        // Emit the fields for this chunk so far.
-        break;
-      }
+    // Step 2: Repeated fields don't use _has_bits_; emit code to clear them
+    // here.
+    if (chunk.front()->is_repeated()) {
+      for (int i = 0; i < chunk.size(); i++) {
+        const FieldDescriptor* field = chunk[i];
+        const FieldGenerator& generator = field_generators_.get(field);
 
-      if (memset_run_start == -1) {
-        memset_run_start = i;
+        generator.GenerateMessageClearingCode(printer);
       }
-
-      memset_run_end = i;
-      last_chunk_end = i;
-      last_chunk_mask |= static_cast<uint32>(1) << (index % 32);
+      continue;
     }
 
-    // Step 4: Non-repeated, non-zero initializable fields.
-    for (; i < optimized_order_.size(); i++) {
-      const FieldDescriptor* field = optimized_order_[i];
-      if (field->is_repeated() || CanInitializeByZeroing(field)) {
-        break;
-      }
-
-      // "index" defines where in the _has_bits_ the field appears.
-      // "i" is our loop counter within optimized_order_.
-      int index = HasFieldPresence(descriptor_->file()) ?
-          has_bit_indices_[field->index()] : 0;
-      int chunk = index / 8;
+    // Step 3: Non-repeated fields that can be cleared by memset-to-0, then
+    // non-repeated, non-zero initializable fields.
+    int last_chunk = HasFieldPresence(descriptor_->file())
+                         ? has_bit_indices_[chunk.front()->index()] / 8
+                         : 0;
+    int last_chunk_start = 0;
+    int memset_run_start = -1;
+    int memset_run_end = -1;
 
-      if (last_chunk == -1) {
-        last_chunk = chunk;
-        last_chunk_start = i;
-      } else if (chunk != last_chunk) {
-        // Emit the fields for this chunk so far.
-        break;
+    for (int i = 0; i < chunk.size(); i++) {
+      const FieldDescriptor* field = chunk[i];
+      if (CanInitializeByZeroing(field)) {
+        if (memset_run_start == -1) {
+          memset_run_start = i;
+        }
+        memset_run_end = i;
       }
-
-      last_chunk_end = i;
-      last_chunk_mask |= static_cast<uint32>(1) << (index % 32);
     }
 
-    if (last_chunk != -1) {
-      GOOGLE_DCHECK_NE(-1, last_chunk_start);
-      GOOGLE_DCHECK_NE(-1, last_chunk_end);
-      GOOGLE_DCHECK_NE(0, last_chunk_mask);
+    const bool have_outer_if =
+        HasFieldPresence(descriptor_->file()) && chunk.size() > 1 &&
+        (memset_run_end != chunk.size() - 1 || unconditional_budget < 0);
 
+    if (have_outer_if) {
+      uint32 last_chunk_mask = GenChunkMask(chunk, has_bit_indices_);
       const int count = popcnt(last_chunk_mask);
-      const bool have_outer_if = HasFieldPresence(descriptor_->file()) &&
-          (last_chunk_start != last_chunk_end);
 
-      if (have_outer_if) {
-        // Check (up to) 8 has_bits at a time if we have more than one field in
-        // this chunk.  Due to field layout ordering, we may check
-        // _has_bits_[last_chunk * 8 / 32] multiple times.
-        GOOGLE_DCHECK_LE(2, count);
-        GOOGLE_DCHECK_GE(8, count);
+      // Check (up to) 8 has_bits at a time if we have more than one field in
+      // this chunk.  Due to field layout ordering, we may check
+      // _has_bits_[last_chunk * 8 / 32] multiple times.
+      GOOGLE_DCHECK_LE(2, count);
+      GOOGLE_DCHECK_GE(8, count);
 
-        printer->Print(
-          "if (_has_bits_[$index$ / 32] & $mask$u) {\n",
-          "index", SimpleItoa(last_chunk * 8),
-          "mask", SimpleItoa(last_chunk_mask));
-        printer->Indent();
+      if (cached_has_bit_index != last_chunk / 4) {
+        cached_has_bit_index = last_chunk / 4;
+        printer->Print("cached_has_bits = _has_bits_[$idx$];\n", "idx",
+                       SimpleItoa(cached_has_bit_index));
       }
+      printer->Print("if (cached_has_bits & $mask$u) {\n", "mask",
+                     SimpleItoa(last_chunk_mask));
+      printer->Indent();
+    }
 
-      if (memset_run_start != -1) {
-        if (memset_run_start == memset_run_end) {
-          // For clarity, do not memset a single field.
-          const FieldGenerator& generator =
-              field_generators_.get(optimized_order_[memset_run_start]);
-          generator.GenerateMessageClearingCode(printer);
-        } else {
-          const string first_field_name =
-              FieldName(optimized_order_[memset_run_start]);
-          const string last_field_name =
-              FieldName(optimized_order_[memset_run_end]);
-
-          printer->Print(
-            "::memset(&$first$_, 0, reinterpret_cast<char*>(&$last$_) -\n"
-            "  reinterpret_cast<char*>(&$first$_) + sizeof($last$_));\n",
-            "first", first_field_name,
-            "last", last_field_name);
-        }
+    if (memset_run_start != -1) {
+      if (memset_run_start == memset_run_end) {
+        // For clarity, do not memset a single field.
+        const FieldGenerator& generator =
+            field_generators_.get(chunk[memset_run_start]);
+        generator.GenerateMessageClearingCode(printer);
+      } else {
+        const string first_field_name = FieldName(chunk[memset_run_start]);
+        const string last_field_name = FieldName(chunk[memset_run_end]);
 
-        // Advance last_chunk_start to skip over the fields we zeroed/memset.
-        last_chunk_start = memset_run_end + 1;
+        printer->Print(
+            "::memset(&$first$_, 0, static_cast<size_t>(\n"
+            "    reinterpret_cast<char*>(&$last$_) -\n"
+            "    reinterpret_cast<char*>(&$first$_)) + sizeof($last$_));\n",
+            "first", first_field_name, "last", last_field_name);
       }
 
-      // Go back and emit clears for each of the fields we processed.
-      for (int j = last_chunk_start; j <= last_chunk_end; j++) {
-        const FieldDescriptor* field = optimized_order_[j];
-        const string fieldname = FieldName(field);
-        const FieldGenerator& generator = field_generators_.get(field);
+      // Advance last_chunk_start to skip over the fields we zeroed/memset.
+      last_chunk_start = memset_run_end + 1;
+    }
+
+    // Go back and emit clears for each of the fields we processed.
+    for (int j = last_chunk_start; j < chunk.size(); j++) {
+      const FieldDescriptor* field = chunk[j];
+      const string fieldname = FieldName(field);
+      const FieldGenerator& generator = field_generators_.get(field);
 
-        // It's faster to just overwrite primitive types, but we should only
-        // clear strings and messages if they were set.
-        //
-        // TODO(kenton):  Let the CppFieldGenerator decide this somehow.
-        bool should_check_bit =
+      // It's faster to just overwrite primitive types, but we should only
+      // clear strings and messages if they were set.
+      //
+      // TODO(kenton):  Let the CppFieldGenerator decide this somehow.
+      bool should_check_bit =
           field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE ||
           field->cpp_type() == FieldDescriptor::CPPTYPE_STRING;
 
-        bool have_enclosing_if = false;
-        if (should_check_bit &&
-            // If no field presence, then always clear strings/messages as well.
-            HasFieldPresence(descriptor_->file())) {
-          printer->Print("if (has_$name$()) {\n", "name", fieldname);
-          printer->Indent();
-          have_enclosing_if = true;
+      bool have_enclosing_if = false;
+      if (should_check_bit &&
+          // If no field presence, then always clear strings/messages as well.
+          HasFieldPresence(descriptor_->file())) {
+        if (!field->options().weak() &&
+            cached_has_bit_index != (has_bit_indices_[field->index()] / 32)) {
+          cached_has_bit_index = (has_bit_indices_[field->index()] / 32);
+          printer->Print("cached_has_bits = _has_bits_[$new_index$];\n",
+                         "new_index", SimpleItoa(cached_has_bit_index));
         }
-
-        generator.GenerateMessageClearingCode(printer);
-
-        if (have_enclosing_if) {
-          printer->Outdent();
-          printer->Print("}\n");
+        if (!MaybeGenerateOptionalFieldCondition(printer, field,
+                                                 cached_has_bit_index)) {
+          printer->Print("if (has_$name$()) {\n", "name", fieldname);
         }
+        printer->Indent();
+        have_enclosing_if = true;
       }
 
-      if (have_outer_if) {
+      generator.GenerateMessageClearingCode(printer);
+
+      if (have_enclosing_if) {
         printer->Outdent();
         printer->Print("}\n");
       }
     }
+
+    if (have_outer_if) {
+      printer->Outdent();
+      printer->Print("}\n");
+    }
   }
 
   // Step 4: Unions.
@@ -2504,14 +2820,16 @@ GenerateClear(io::Printer* printer) {
         "oneof_name", descriptor_->oneof_decl(i)->name());
   }
 
+  if (num_weak_fields_) {
+    printer->Print("_weak_field_map_.ClearAll();\n");
+  }
+
   if (HasFieldPresence(descriptor_->file())) {
     // Step 5: Everything else.
     printer->Print("_has_bits_.Clear();\n");
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    printer->Print("_internal_metadata_.Clear();\n");
-  }
+  printer->Print("_internal_metadata_.Clear();\n");
 
   printer->Outdent();
   printer->Print("}\n");
@@ -2615,6 +2933,7 @@ GenerateSwap(io::Printer* printer) {
   printer->Print("void $classname$::InternalSwap($classname$* other) {\n",
                  "classname", classname_);
   printer->Indent();
+  printer->Print("using std::swap;\n");
 
   if (HasGeneratedMethods(descriptor_->file(), options_)) {
     for (int i = 0; i < optimized_order_.size(); i++) {
@@ -2626,27 +2945,28 @@ GenerateSwap(io::Printer* printer) {
 
     for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
       printer->Print(
-        "std::swap($oneof_name$_, other->$oneof_name$_);\n"
-        "std::swap(_oneof_case_[$i$], other->_oneof_case_[$i$]);\n",
+        "swap($oneof_name$_, other->$oneof_name$_);\n"
+        "swap(_oneof_case_[$i$], other->_oneof_case_[$i$]);\n",
         "oneof_name", descriptor_->oneof_decl(i)->name(),
         "i", SimpleItoa(i));
     }
 
     if (HasFieldPresence(descriptor_->file())) {
       for (int i = 0; i < HasBitsSize() / 4; ++i) {
-        printer->Print("std::swap(_has_bits_[$i$], other->_has_bits_[$i$]);\n",
+        printer->Print("swap(_has_bits_[$i$], other->_has_bits_[$i$]);\n",
                        "i", SimpleItoa(i));
       }
     }
 
-    if (PreserveUnknownFields(descriptor_)) {
-      printer->Print("_internal_metadata_.Swap(&other->_internal_metadata_);\n");
-    }
+    printer->Print("_internal_metadata_.Swap(&other->_internal_metadata_);\n");
 
-    printer->Print("std::swap(_cached_size_, other->_cached_size_);\n");
     if (descriptor_->extension_range_count() > 0) {
       printer->Print("_extensions_.Swap(&other->_extensions_);\n");
     }
+    if (num_weak_fields_) {
+      printer->Print(
+          "_weak_field_map_.UnsafeArenaSwap(&other->_weak_field_map_);\n");
+    }
   } else {
     printer->Print("GetReflection()->Swap(this, other);");
   }
@@ -2714,7 +3034,14 @@ GenerateMergeFrom(io::Printer* printer) {
   }
 
   printer->Print(
-    "_internal_metadata_.MergeFrom(from._internal_metadata_);\n");
+    "_internal_metadata_.MergeFrom(from._internal_metadata_);\n"
+    "::google::protobuf::uint32 cached_has_bits = 0;\n"
+    "(void) cached_has_bits;\n\n");
+
+  // cached_has_bit_index maintains that:
+  //   cached_has_bits = from._has_bits_[cached_has_bit_index]
+  // for cached_has_bit_index >= 0
+  int cached_has_bit_index = -1;
 
   int last_i = -1;
   for (int i = 0; i < optimized_order_.size(); ) {
@@ -2734,7 +3061,7 @@ GenerateMergeFrom(io::Printer* printer) {
       generator.GenerateMergingCode(printer);
     }
 
-    // Merge Optional and Required fields (after a _has_bit check).
+    // Merge Optional and Required fields (after a _has_bit_ check).
     int last_chunk = -1;
     int last_chunk_start = -1;
     int last_chunk_end = -1;
@@ -2779,23 +3106,43 @@ GenerateMergeFrom(io::Printer* printer) {
         GOOGLE_DCHECK_LE(2, count);
         GOOGLE_DCHECK_GE(8, count);
 
+        if (cached_has_bit_index != last_chunk / 4) {
+          int new_index = last_chunk / 4;
+          printer->Print("cached_has_bits = from._has_bits_[$new_index$];\n",
+                         "new_index", SimpleItoa(new_index));
+          cached_has_bit_index = new_index;
+        }
+
         printer->Print(
-          "if (from._has_bits_[$index$ / 32] & $mask$u) {\n",
-          "index", SimpleItoa(last_chunk * 8),
+          "if (cached_has_bits & $mask$u) {\n",
           "mask", SimpleItoa(last_chunk_mask));
         printer->Indent();
       }
 
       // Go back and emit clears for each of the fields we processed.
+      bool deferred_has_bit_changes = false;
       for (int j = last_chunk_start; j <= last_chunk_end; j++) {
         const FieldDescriptor* field = optimized_order_[j];
         const FieldGenerator& generator = field_generators_.get(field);
 
         bool have_enclosing_if = false;
         if (HasFieldPresence(descriptor_->file())) {
-          printer->Print(
-            "if (from.has_$name$()) {\n",
-            "name", FieldName(field));
+          // Attempt to use the state of cached_has_bits, if possible.
+          int has_bit_index = has_bit_indices_[field->index()];
+          if (!field->options().weak() &&
+              cached_has_bit_index == has_bit_index / 32) {
+            const string mask = StrCat(
+                strings::Hex(1u << (has_bit_index % 32),
+                strings::ZERO_PAD_8));
+
+            printer->Print(
+                "if (cached_has_bits & 0x$mask$u) {\n", "mask", mask);
+          } else {
+            printer->Print(
+              "if (from.has_$name$()) {\n",
+              "name", FieldName(field));
+          }
+
           printer->Indent();
           have_enclosing_if = true;
         } else {
@@ -2805,7 +3152,17 @@ GenerateMergeFrom(io::Printer* printer) {
               printer, "from.", field);
         }
 
-        generator.GenerateMergingCode(printer);
+        if (have_outer_if && IsPOD(field)) {
+          // GenerateCopyConstructorCode for enum and primitive scalar fields
+          // does not do _has_bits_ modifications.  We defer _has_bits_
+          // manipulation until the end of the outer if.
+          //
+          // This can reduce the number of loads/stores by up to 7 per 8 fields.
+          deferred_has_bit_changes = true;
+          generator.GenerateCopyConstructorCode(printer);
+        } else {
+          generator.GenerateMergingCode(printer);
+        }
 
         if (have_enclosing_if) {
           printer->Outdent();
@@ -2814,6 +3171,14 @@ GenerateMergeFrom(io::Printer* printer) {
       }
 
       if (have_outer_if) {
+        if (deferred_has_bit_changes) {
+          // Flush the has bits for the primitives we deferred.
+          GOOGLE_CHECK_LE(0, cached_has_bit_index);
+          printer->Print(
+              "_has_bits_[$index$] |= cached_has_bits;\n",
+              "index", SimpleItoa(cached_has_bit_index));
+        }
+
         printer->Outdent();
         printer->Print("}\n");
       }
@@ -2849,6 +3214,9 @@ GenerateMergeFrom(io::Printer* printer) {
     printer->Print(
         "}\n");
   }
+  if (num_weak_fields_) {
+    printer->Print("_weak_field_map_.MergeFrom(from._weak_field_map_);\n");
+  }
 
   printer->Outdent();
   printer->Print("}\n");
@@ -2894,44 +3262,74 @@ GenerateCopyFrom(io::Printer* printer) {
 
 void MessageGenerator::
 GenerateMergeFromCodedStream(io::Printer* printer) {
+  std::map<string, string> vars;
+  SetUnknkownFieldsVariable(descriptor_, options_, &vars);
   if (descriptor_->options().message_set_wire_format()) {
     // Special-case MessageSet.
-    printer->Print(
+    vars["classname"] = classname_;
+    printer->Print(vars,
       "bool $classname$::MergePartialFromCodedStream(\n"
-      "    ::google::protobuf::io::CodedInputStream* input) {\n",
-      "classname", classname_);
-
-    printer->Print(
-        "  return _extensions_.ParseMessageSet(input, "
-        "internal_default_instance(),\n"
-        "                                      mutable_unknown_fields());\n",
-        // Vars.
-        "classname", classname_);
-
-    printer->Print(
+      "    ::google::protobuf::io::CodedInputStream* input) {\n"
+      "  return _extensions_.ParseMessageSet(input,\n"
+      "      internal_default_instance(), $mutable_unknown_fields$);\n"
       "}\n");
     return;
   }
+  std::vector<const FieldDescriptor*> ordered_fields =
+      SortFieldsByNumber(descriptor_);
 
   printer->Print(
     "bool $classname$::MergePartialFromCodedStream(\n"
-    "    ::google::protobuf::io::CodedInputStream* input) {\n"
-    "#define DO_(EXPRESSION) if (!GOOGLE_PREDICT_TRUE(EXPRESSION)) goto failure\n"
-    "  ::google::protobuf::uint32 tag;\n",
+    "    ::google::protobuf::io::CodedInputStream* input) {\n",
     "classname", classname_);
 
-  if (PreserveUnknownFields(descriptor_) &&
-      !UseUnknownFieldSet(descriptor_->file(), options_)) {
-    // Use LazyStringOutputString to avoid initializing unknown fields string
-    // unless it is actually needed. For the same reason, disable eager refresh
-    // on the CodedOutputStream.
-    printer->Print(
-      "  ::google::protobuf::io::LazyStringOutputStream unknown_fields_string(\n"
-      "      ::google::protobuf::NewPermanentCallback(&_internal_metadata_,\n"
-      "          &::google::protobuf::internal::InternalMetadataWithArenaLite::mutable_unknown_fields));\n"
-      "  ::google::protobuf::io::CodedOutputStream unknown_fields_stream(\n"
-      "      &unknown_fields_string, false);\n",
-      "classname", classname_);
+  if (table_driven_) {
+    printer->Indent();
+
+    const string lite = UseUnknownFieldSet(descriptor_->file(), options_) ?
+        "" : "Lite";
+
+    printer->Print(
+        "return ::google::protobuf::internal::MergePartialFromCodedStream$lite$(\n"
+        "    this,\n"
+        "    ::$file_namespace$::TableStruct::schema[\n"
+        "      $classname$::kIndexInFileMessages],\n"
+        "    input);\n",
+        "classname", classname_, "file_namespace",
+        FileLevelNamespace(descriptor_), "lite", lite);
+
+    printer->Outdent();
+
+    printer->Print("}\n");
+    return;
+  }
+
+  if (SupportsArenas(descriptor_)) {
+    for (int i = 0; i < ordered_fields.size(); i++) {
+      const FieldDescriptor* field = ordered_fields[i];
+      const FieldGenerator& field_generator = field_generators_.get(field);
+      if (field_generator.MergeFromCodedStreamNeedsArena()) {
+        printer->Print(
+          "  ::google::protobuf::Arena* arena = GetArenaNoVirtual();\n");
+        break;
+      }
+    }
+  }
+
+  printer->Print(
+      "#define DO_(EXPRESSION) if (!GOOGLE_PREDICT_TRUE(EXPRESSION)) goto "
+      "failure\n"
+      "  ::google::protobuf::uint32 tag;\n");
+
+  if (!UseUnknownFieldSet(descriptor_->file(), options_)) {
+    printer->Print(
+        "  ::google::protobuf::internal::LiteUnknownFieldSetter unknown_fields_setter(\n"
+        "      &_internal_metadata_);\n"
+        "  ::google::protobuf::io::StringOutputStream unknown_fields_output(\n"
+        "      unknown_fields_setter.buffer());\n"
+        "  ::google::protobuf::io::CodedOutputStream unknown_fields_stream(\n"
+        "      &unknown_fields_output, false);\n",
+        "classname", classname_);
   }
 
   printer->Print(
@@ -2942,10 +3340,12 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
   printer->Print("for (;;) {\n");
   printer->Indent();
 
-  std::vector<const FieldDescriptor*> ordered_fields =
-      SortFieldsByNumber(descriptor_);
-  uint32 maxtag = descriptor_->field_count() == 0 ? 0 :
-      WireFormat::MakeTag(ordered_fields[descriptor_->field_count() - 1]);
+  // To calculate the maximum tag to expect, we look at the highest-numbered
+  // field. We need to be prepared to handle more than one wire type if that
+  // field is a packable repeated field, so to simplify things we assume the
+  // highest possible wire type of 5.
+  uint32 maxtag =
+      ordered_fields.empty() ? 0 : ordered_fields.back()->number() * 8 + 5;
   const int kCutoff0 = 127;               // fits in 1-byte varint
   const int kCutoff1 = (127 << 7) + 127;  // fits in 2-byte varint
 
@@ -2963,6 +3363,15 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
         break;
       }
     }
+
+    for (int i = 0; i < parent->extension_count(); i++) {
+      const FieldDescriptor* field = parent->extension(i);
+      if (field->type() == FieldDescriptor::TYPE_GROUP &&
+          field->message_type() == descriptor_) {
+        capture_last_tag = true;
+        break;
+      }
+    }
   }
 
   for (int i = 0; i < descriptor_->file()->extension_count(); i++) {
@@ -2974,14 +3383,13 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
     }
   }
 
-  printer->Print("::std::pair< ::google::protobuf::uint32, bool> p = "
-                 "input->ReadTagWithCutoff$lasttag$($max$u);\n"
+  printer->Print("::std::pair<::google::protobuf::uint32, bool> p = "
+                 "input->ReadTagWithCutoffNoLastTag($max$u);\n"
                  "tag = p.first;\n"
                  "if (!p.second) goto handle_unusual;\n",
                  "max", SimpleItoa(maxtag <= kCutoff0 ? kCutoff0 :
                                    (maxtag <= kCutoff1 ? kCutoff1 :
-                                    maxtag)),
-                 "lasttag", !capture_last_tag ? "NoLastTag" : "");
+                                    maxtag)));
 
   if (descriptor_->field_count() > 0) {
     // We don't even want to print the switch() if we have no fields because
@@ -3004,20 +3412,8 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
 
     printer->Indent();
 
-    // Find repeated messages and groups now, to simplify what follows.
-    hash_set<int> fields_with_parse_loop;
     for (int i = 0; i < ordered_fields.size(); i++) {
       const FieldDescriptor* field = ordered_fields[i];
-      if (field->is_repeated() &&
-          (field->type() == FieldDescriptor::TYPE_MESSAGE ||
-           field->type() == FieldDescriptor::TYPE_GROUP)) {
-        fields_with_parse_loop.insert(i);
-      }
-    }
-
-    for (int i = 0; i < ordered_fields.size(); i++) {
-      const FieldDescriptor* field = ordered_fields[i];
-      const bool loops = fields_with_parse_loop.count(i) > 0;
 
       PrintFieldComment(printer, field);
 
@@ -3028,13 +3424,11 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
       const FieldGenerator& field_generator = field_generators_.get(field);
 
       // Emit code to parse the common, expected case.
-      printer->Print("if (static_cast< ::google::protobuf::uint8>(tag) ==\n"
-                     "    static_cast< ::google::protobuf::uint8>($commontag$u)) {\n",
-                     "commontag", SimpleItoa(WireFormat::MakeTag(field)));
-
-      if (loops) {
-        printer->Print("  DO_(input->IncrementRecursionDepth());\n");
-      }
+      printer->Print(
+        "if (static_cast< ::google::protobuf::uint8>(tag) ==\n"
+        "    static_cast< ::google::protobuf::uint8>($truncated$u /* $full$ & 0xFF */)) {\n",
+        "truncated", SimpleItoa(WireFormat::MakeTag(field) & 0xFF),
+        "full", SimpleItoa(WireFormat::MakeTag(field)));
 
       printer->Indent();
       if (field->is_packed()) {
@@ -3048,22 +3442,30 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
       if (field->is_packed()) {
         internal::WireFormatLite::WireType wiretype =
             WireFormat::WireTypeForFieldType(field->type());
-        printer->Print("} else if (static_cast< ::google::protobuf::uint8>(tag) ==\n"
-                       "           static_cast< ::google::protobuf::uint8>($uncommontag$u)) {\n",
-                       "uncommontag", SimpleItoa(
-                           internal::WireFormatLite::MakeTag(
-                               field->number(), wiretype)));
+        const uint32 tag = internal::WireFormatLite::MakeTag(
+            field->number(), wiretype);
+        printer->Print(
+            "} else if (\n"
+            "    static_cast< ::google::protobuf::uint8>(tag) ==\n"
+            "    static_cast< ::google::protobuf::uint8>($truncated$u /* $full$ & 0xFF */)) {\n",
+            "truncated", SimpleItoa(tag & 0xFF),
+            "full", SimpleItoa(tag));
+
         printer->Indent();
         field_generator.GenerateMergeFromCodedStream(printer);
         printer->Outdent();
       } else if (field->is_packable() && !field->is_packed()) {
         internal::WireFormatLite::WireType wiretype =
             internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED;
-        printer->Print("} else if (static_cast< ::google::protobuf::uint8>(tag) ==\n"
-                       "           static_cast< ::google::protobuf::uint8>($uncommontag$u)) {\n",
-                       "uncommontag", SimpleItoa(
-                           internal::WireFormatLite::MakeTag(
-                               field->number(), wiretype)));
+         const uint32 tag = internal::WireFormatLite::MakeTag(
+            field->number(), wiretype);
+
+        printer->Print(
+            "} else if (\n"
+            "    static_cast< ::google::protobuf::uint8>(tag) ==\n"
+            "    static_cast< ::google::protobuf::uint8>($truncated$u /* $full$ & 0xFF */)) {\n",
+            "truncated", SimpleItoa(tag & 0xFF),
+            "full", SimpleItoa(tag));
         printer->Indent();
         field_generator.GenerateMergeFromCodedStreamWithPacking(printer);
         printer->Outdent();
@@ -3074,19 +3476,12 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
         "  goto handle_unusual;\n"
         "}\n");
 
-      // For repeated messages/groups, we need to decrement recursion depth.
-      if (loops) {
-        printer->Print(
-            "input->UnsafeDecrementRecursionDepth();\n");
-      }
-
       printer->Print(
         "break;\n");
 
       printer->Outdent();
       printer->Print("}\n\n");
     }
-
     printer->Print("default: {\n");
     printer->Indent();
   }
@@ -3095,12 +3490,20 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
   printer->Print("handle_unusual:\n");
   printer->Indent();
   // If tag is 0 or an end-group tag then this must be the end of the message.
-  printer->Print(
-    "if (tag == 0 ||\n"
-    "    ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==\n"
-    "    ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {\n"
-    "  goto success;\n"
-    "}\n");
+  if (capture_last_tag) {
+    printer->Print(
+      "if (tag == 0 ||\n"
+      "    ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==\n"
+      "    ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {\n"
+      "  input->SetLastTag(tag);\n"
+      "  goto success;\n"
+      "}\n");
+  } else {
+    printer->Print(
+      "if (tag == 0) {\n"
+      "  goto success;\n"
+      "}\n");
+  }
 
   // Handle extension ranges.
   if (descriptor_->extension_range_count() > 0) {
@@ -3128,23 +3531,16 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
       }
     }
     printer->Print(") {\n");
-    if (PreserveUnknownFields(descriptor_)) {
-      if (UseUnknownFieldSet(descriptor_->file(), options_)) {
-        printer->Print(
-            "  DO_(_extensions_.ParseField(tag, input, "
-            "internal_default_instance(),\n"
-            "                              mutable_unknown_fields()));\n");
-      } else {
-        printer->Print(
-            "  DO_(_extensions_.ParseField(tag, input, "
-            "internal_default_instance(),\n"
-            "                              &unknown_fields_stream));\n");
-      }
+    if (UseUnknownFieldSet(descriptor_->file(), options_)) {
+      printer->Print(vars,
+        "  DO_(_extensions_.ParseField(tag, input,\n"
+        "      internal_default_instance(),\n"
+        "      $mutable_unknown_fields$));\n");
     } else {
       printer->Print(
-          // With static initializers.
-          "  DO_(_extensions_.ParseField(tag, input, "
-          "internal_default_instance());\n");
+        "  DO_(_extensions_.ParseField(tag, input,\n"
+        "      internal_default_instance(),\n"
+        "      &unknown_fields_stream));\n");
     }
     printer->Print(
       "  continue;\n"
@@ -3152,19 +3548,14 @@ GenerateMergeFromCodedStream(io::Printer* printer) {
   }
 
   // We really don't recognize this tag.  Skip it.
-  if (PreserveUnknownFields(descriptor_)) {
-    if (UseUnknownFieldSet(descriptor_->file(), options_)) {
-      printer->Print(
+  if (UseUnknownFieldSet(descriptor_->file(), options_)) {
+    printer->Print(vars,
         "DO_(::google::protobuf::internal::WireFormat::SkipField(\n"
-        "      input, tag, mutable_unknown_fields()));\n");
-    } else {
-      printer->Print(
-        "DO_(::google::protobuf::internal::WireFormatLite::SkipField(\n"
-        "    input, tag, &unknown_fields_stream));\n");
-    }
+        "      input, tag, $mutable_unknown_fields$));\n");
   } else {
     printer->Print(
-      "DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));\n");
+        "DO_(::google::protobuf::internal::WireFormatLite::SkipField(\n"
+        "    input, tag, &unknown_fields_stream));\n");
   }
 
   if (descriptor_->field_count() > 0) {
@@ -3194,7 +3585,7 @@ void MessageGenerator::GenerateSerializeOneofFields(
     bool to_array) {
   GOOGLE_CHECK(!fields.empty());
   if (fields.size() == 1) {
-    GenerateSerializeOneField(printer, fields[0], to_array);
+    GenerateSerializeOneField(printer, fields[0], to_array, -1);
     return;
   }
   // We have multiple mutually exclusive choices.  Emit a switch statement.
@@ -3227,14 +3618,31 @@ void MessageGenerator::GenerateSerializeOneofFields(
 }
 
 void MessageGenerator::GenerateSerializeOneField(
-    io::Printer* printer, const FieldDescriptor* field, bool to_array) {
-  PrintFieldComment(printer, field);
+    io::Printer* printer, const FieldDescriptor* field, bool to_array,
+    int cached_has_bits_index) {
+  if (!field->options().weak()) {
+    // For weakfields, PrintFieldComment is called during iteration.
+    PrintFieldComment(printer, field);
+  }
 
   bool have_enclosing_if = false;
-  if (!field->is_repeated() && HasFieldPresence(descriptor_->file())) {
-    printer->Print(
-      "if (has_$name$()) {\n",
-      "name", FieldName(field));
+  if (field->options().weak()) {
+  } else if (!field->is_repeated() && HasFieldPresence(descriptor_->file())) {
+    // Attempt to use the state of cached_has_bits, if possible.
+    int has_bit_index = has_bit_indices_[field->index()];
+    if (cached_has_bits_index == has_bit_index / 32) {
+      const string mask = StrCat(
+          strings::Hex(1u << (has_bit_index % 32),
+          strings::ZERO_PAD_8));
+
+      printer->Print(
+          "if (cached_has_bits & 0x$mask$u) {\n", "mask", mask);
+    } else {
+      printer->Print(
+        "if (has_$name$()) {\n",
+        "name", FieldName(field));
+    }
+
     printer->Indent();
     have_enclosing_if = true;
   } else if (!HasFieldPresence(descriptor_->file())) {
@@ -3284,13 +3692,16 @@ GenerateSerializeWithCachedSizes(io::Printer* printer) {
       "  _extensions_.SerializeMessageSetWithCachedSizes(output);\n",
       "classname", classname_);
     GOOGLE_CHECK(UseUnknownFieldSet(descriptor_->file(), options_));
-    printer->Print(
+    std::map<string, string> vars;
+    SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+    printer->Print(vars,
       "  ::google::protobuf::internal::WireFormat::SerializeUnknownMessageSetItems(\n"
-      "      unknown_fields(), output);\n");
+      "      $unknown_fields$, output);\n");
     printer->Print(
       "}\n");
     return;
   }
+  if (options_.table_driven_serialization) return;
 
   printer->Print(
     "void $classname$::SerializeWithCachedSizes(\n"
@@ -3325,10 +3736,12 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) {
       "               deterministic, target);\n",
       "classname", classname_);
     GOOGLE_CHECK(UseUnknownFieldSet(descriptor_->file(), options_));
-    printer->Print(
+    std::map<string, string> vars;
+    SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+    printer->Print(vars,
       "  target = ::google::protobuf::internal::WireFormat::\n"
       "             SerializeUnknownMessageSetItemsToArray(\n"
-      "               unknown_fields(), target);\n");
+      "               $unknown_fields$, target);\n");
     printer->Print(
       "  return target;\n"
       "}\n");
@@ -3341,7 +3754,7 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) {
     "classname", classname_);
   printer->Indent();
 
-  printer->Print("(void)deterministic;  // Unused\n");
+  printer->Print("(void)deterministic; // Unused\n");
   printer->Print(
     "// @@protoc_insertion_point(serialize_to_array_start:$full_name$)\n",
     "full_name", descriptor_->full_name());
@@ -3372,7 +3785,8 @@ GenerateSerializeWithCachedSizesBody(io::Printer* printer, bool to_array) {
         : mg_(mg),
           printer_(printer),
           to_array_(to_array),
-          eager_(!HasFieldPresence(mg->descriptor_->file())) {}
+          eager_(!HasFieldPresence(mg->descriptor_->file())),
+          cached_has_bit_index_(-1) {}
 
     ~LazySerializerEmitter() { Flush(); }
 
@@ -3383,7 +3797,27 @@ GenerateSerializeWithCachedSizesBody(io::Printer* printer, bool to_array) {
         Flush();
       }
       if (field->containing_oneof() == NULL) {
-        mg_->GenerateSerializeOneField(printer_, field, to_array_);
+        // TODO(ckennelly): Defer non-oneof fields similarly to oneof fields.
+
+        if (!field->options().weak() && !field->is_repeated() && !eager_) {
+          // We speculatively load the entire _has_bits_[index] contents, even
+          // if it is for only one field.  Deferring non-oneof emitting would
+          // allow us to determine whether this is going to be useful.
+          int has_bit_index = mg_->has_bit_indices_[field->index()];
+          if (cached_has_bit_index_ != has_bit_index / 32) {
+            // Reload.
+            int new_index = has_bit_index / 32;
+
+            printer_->Print(
+                "cached_has_bits = _has_bits_[$new_index$];\n",
+                "new_index", SimpleItoa(new_index));
+
+            cached_has_bit_index_ = new_index;
+          }
+        }
+
+        mg_->GenerateSerializeOneField(
+            printer_, field, to_array_, cached_has_bit_index_);
       } else {
         v_.push_back(field);
       }
@@ -3409,6 +3843,11 @@ GenerateSerializeWithCachedSizesBody(io::Printer* printer, bool to_array) {
     const bool to_array_;
     const bool eager_;
     std::vector<const FieldDescriptor*> v_;
+
+    // cached_has_bit_index_ maintains that:
+    //   cached_has_bits = from._has_bits_[cached_has_bit_index_]
+    // for cached_has_bit_index_ >= 0
+    int cached_has_bit_index_;
   };
 
   std::vector<const FieldDescriptor*> ordered_fields =
@@ -3420,54 +3859,76 @@ GenerateSerializeWithCachedSizesBody(io::Printer* printer, bool to_array) {
   }
   std::sort(sorted_extensions.begin(), sorted_extensions.end(),
             ExtensionRangeSorter());
+  if (num_weak_fields_) {
+    printer->Print(
+        "::google::protobuf::internal::WeakFieldMap::FieldWriter field_writer("
+        "_weak_field_map_);\n");
+  }
+
+  printer->Print(
+      "::google::protobuf::uint32 cached_has_bits = 0;\n"
+      "(void) cached_has_bits;\n\n");
 
   // Merge the fields and the extension ranges, both sorted by field number.
   {
     LazySerializerEmitter e(this, printer, to_array);
+    const FieldDescriptor* last_weak_field = nullptr;
     int i, j;
     for (i = 0, j = 0;
          i < ordered_fields.size() || j < sorted_extensions.size();) {
-      if (i == descriptor_->field_count()) {
-        e.Flush();
-        GenerateSerializeOneExtensionRange(printer,
-                                           sorted_extensions[j++],
-                                           to_array);
-      } else if (j == sorted_extensions.size()) {
-        e.Emit(ordered_fields[i++]);
-      } else if (ordered_fields[i]->number() < sorted_extensions[j]->start) {
-        e.Emit(ordered_fields[i++]);
-      } else {
+      if ((j == sorted_extensions.size()) ||
+          (i < descriptor_->field_count() &&
+           ordered_fields[i]->number() < sorted_extensions[j]->start)) {
+        const FieldDescriptor* field = ordered_fields[i++];
+        if (field->options().weak()) {
+          last_weak_field = field;
+          PrintFieldComment(printer, field);
+        } else {
+          if (last_weak_field != nullptr) {
+            e.Emit(last_weak_field);
+            last_weak_field = nullptr;
+          }
+          e.Emit(field);
+        }
+      } else  {
+        if (last_weak_field != nullptr) {
+          e.Emit(last_weak_field);
+          last_weak_field = nullptr;
+        }
         e.Flush();
         GenerateSerializeOneExtensionRange(printer,
                                            sorted_extensions[j++],
                                            to_array);
       }
     }
+    if (last_weak_field != nullptr) {
+      e.Emit(last_weak_field);
+    }
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    if (UseUnknownFieldSet(descriptor_->file(), options_)) {
-      printer->Print("if (_internal_metadata_.have_unknown_fields()) {\n");
-      printer->Indent();
-      if (to_array) {
-        printer->Print(
-          "target = "
-              "::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(\n"
-          "    unknown_fields(), target);\n");
-      } else {
-        printer->Print(
-          "::google::protobuf::internal::WireFormat::SerializeUnknownFields(\n"
-          "    unknown_fields(), output);\n");
-      }
-      printer->Outdent();
-
-      printer->Print(
-        "}\n");
+  std::map<string, string> vars;
+  SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+  if (UseUnknownFieldSet(descriptor_->file(), options_)) {
+    printer->Print(vars,
+      "if ($have_unknown_fields$) {\n");
+    printer->Indent();
+    if (to_array) {
+      printer->Print(vars,
+        "target = "
+        "::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(\n"
+        "    $unknown_fields$, target);\n");
     } else {
-      printer->Print(
-        "output->WriteRaw(unknown_fields().data(),\n"
-        "                 static_cast<int>(unknown_fields().size()));\n");
+      printer->Print(vars,
+        "::google::protobuf::internal::WireFormat::SerializeUnknownFields(\n"
+        "    $unknown_fields$, output);\n");
     }
+    printer->Outdent();
+
+    printer->Print("}\n");
+  } else {
+    printer->Print(vars,
+      "output->WriteRaw($unknown_fields$.data(),\n"
+      "                 static_cast<int>($unknown_fields$.size()));\n");
   }
 }
 
@@ -3502,8 +3963,9 @@ static string ConditionalToCheckBitmasks(const std::vector<uint32>& masks) {
   }
   GOOGLE_CHECK(!parts.empty());
   // If we have multiple parts, each expected to be 0, then bitwise-or them.
-  string result = parts.size() == 1 ? parts[0] :
-      StrCat("(", Join(parts, "\n       | "), ")");
+  string result = parts.size() == 1
+                      ? parts[0]
+                      : StrCat("(", Join(parts, "\n       | "), ")");
   return result + " == 0";
 }
 
@@ -3511,24 +3973,24 @@ void MessageGenerator::
 GenerateByteSize(io::Printer* printer) {
   if (descriptor_->options().message_set_wire_format()) {
     // Special-case MessageSet.
+    GOOGLE_CHECK(UseUnknownFieldSet(descriptor_->file(), options_));
+    std::map<string, string> vars;
+    SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+    vars["classname"] = classname_;
+    vars["full_name"] = descriptor_->full_name();
     printer->Print(
+        vars,
         "size_t $classname$::ByteSizeLong() const {\n"
         "// @@protoc_insertion_point(message_set_byte_size_start:$full_name$)\n"
-        "  size_t total_size = _extensions_.MessageSetByteSize();\n",
-        "classname", classname_, "full_name", descriptor_->full_name());
-    GOOGLE_CHECK(UseUnknownFieldSet(descriptor_->file(), options_));
-    printer->Print(
-      "if (_internal_metadata_.have_unknown_fields()) {\n"
-      "  total_size += ::google::protobuf::internal::WireFormat::\n"
-      "      ComputeUnknownMessageSetItemsSize(unknown_fields());\n"
-      "}\n");
-    printer->Print(
-      "  int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);\n"
-      "  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();\n"
-      "  _cached_size_ = cached_size;\n"
-      "  GOOGLE_SAFE_CONCURRENT_WRITES_END();\n"
-      "  return total_size;\n"
-      "}\n");
+        "  size_t total_size = _extensions_.MessageSetByteSize();\n"
+        "  if ($have_unknown_fields$) {\n"
+        "    total_size += ::google::protobuf::internal::WireFormat::\n"
+        "        ComputeUnknownMessageSetItemsSize($unknown_fields$);\n"
+        "  }\n"
+        "  int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);\n"
+        "  SetCachedSize(cached_size);\n"
+        "  return total_size;\n"
+        "}\n");
     return;
   }
 
@@ -3576,19 +4038,19 @@ GenerateByteSize(io::Printer* printer) {
       "\n");
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    if (UseUnknownFieldSet(descriptor_->file(), options_)) {
-      printer->Print(
-        "if (_internal_metadata_.have_unknown_fields()) {\n"
-        "  total_size +=\n"
-        "    ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(\n"
-        "      unknown_fields());\n"
-        "}\n");
-    } else {
-      printer->Print(
-        "total_size += unknown_fields().size();\n"
-        "\n");
-    }
+  std::map<string, string> vars;
+  SetUnknkownFieldsVariable(descriptor_, options_, &vars);
+  if (UseUnknownFieldSet(descriptor_->file(), options_)) {
+    printer->Print(vars,
+      "if ($have_unknown_fields$) {\n"
+      "  total_size +=\n"
+      "    ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(\n"
+      "      $unknown_fields$);\n"
+      "}\n");
+  } else {
+    printer->Print(vars,
+      "total_size += $unknown_fields$.size();\n"
+      "\n");
   }
 
   // Handle required fields (if any).  We expect all of them to be
@@ -3629,28 +4091,30 @@ GenerateByteSize(io::Printer* printer) {
     }
   }
 
-  int last_i = -1;
-  for (int i = 0; i < optimized_order_.size(); ) {
-    // Detect infinite loops.
-    GOOGLE_CHECK_NE(i, last_i);
-    last_i = i;
+  std::vector<std::vector<const FieldDescriptor*> > chunks = CollectFields(
+      optimized_order_,
+      MatchRepeatedAndHasByteAndRequired(
+          &has_bit_indices_, HasFieldPresence(descriptor_->file())));
 
-    // Skip required fields.
-    for (; i < optimized_order_.size() &&
-         optimized_order_[i]->is_required(); i++) {
-    }
+  // Remove chunks with required fields.
+  chunks.erase(std::remove_if(chunks.begin(), chunks.end(), IsRequired),
+               chunks.end());
+
+  for (int chunk_index = 0; chunk_index < chunks.size(); chunk_index++) {
+    const std::vector<const FieldDescriptor*>& chunk = chunks[chunk_index];
+    GOOGLE_CHECK(!chunk.empty());
 
     // Handle repeated fields.
-    for (; i < optimized_order_.size(); i++) {
-      const FieldDescriptor* field = optimized_order_[i];
-      if (!field->is_repeated()) {
-        break;
-      }
+    if (chunk.front()->is_repeated()) {
+      for (int i = 0; i < chunk.size(); i++) {
+        const FieldDescriptor* field = chunk[i];
 
-      PrintFieldComment(printer, field);
-      const FieldGenerator& generator = field_generators_.get(field);
-      generator.GenerateByteSize(printer);
-      printer->Print("\n");
+        PrintFieldComment(printer, field);
+        const FieldGenerator& generator = field_generators_.get(field);
+        generator.GenerateByteSize(printer);
+        printer->Print("\n");
+      }
+      continue;
     }
 
     // Handle optional (non-repeated/oneof) fields.
@@ -3662,92 +4126,62 @@ GenerateByteSize(io::Printer* printer) {
     //  descriptor_->field(8), descriptor_->field(9), ...
     //  descriptor_->field(15),
     // etc.
-    int last_chunk = -1;
-    int last_chunk_start = -1;
-    int last_chunk_end = -1;
-    uint32 last_chunk_mask = 0;
-    for (; i < optimized_order_.size(); i++) {
-      const FieldDescriptor* field = optimized_order_[i];
-      if (field->is_repeated() || field->is_required()) {
-        break;
-      }
+    int last_chunk = HasFieldPresence(descriptor_->file())
+                         ? has_bit_indices_[chunk.front()->index()] / 8
+                         : 0;
+    GOOGLE_DCHECK_NE(-1, last_chunk);
 
-      // "index" defines where in the _has_bits_ the field appears.
-      // "i" is our loop counter within optimized_order_.
-      int index = HasFieldPresence(descriptor_->file()) ?
-          has_bit_indices_[field->index()] : 0;
-      int chunk = index / 8;
+    const bool have_outer_if =
+        HasFieldPresence(descriptor_->file()) && chunk.size() > 1;
 
-      if (last_chunk == -1) {
-        last_chunk = chunk;
-        last_chunk_start = i;
-      } else if (chunk != last_chunk) {
-        // Emit the fields for this chunk so far.
-        break;
-      }
+    if (have_outer_if) {
+      uint32 last_chunk_mask = GenChunkMask(chunk, has_bit_indices_);
+      const int count = popcnt(last_chunk_mask);
 
-      last_chunk_end = i;
-      last_chunk_mask |= static_cast<uint32>(1) << (index % 32);
-    }
+      // Check (up to) 8 has_bits at a time if we have more than one field in
+      // this chunk.  Due to field layout ordering, we may check
+      // _has_bits_[last_chunk * 8 / 32] multiple times.
+      GOOGLE_DCHECK_LE(2, count);
+      GOOGLE_DCHECK_GE(8, count);
 
-    if (last_chunk != -1) {
-      GOOGLE_DCHECK_NE(-1, last_chunk_start);
-      GOOGLE_DCHECK_NE(-1, last_chunk_end);
-      GOOGLE_DCHECK_NE(0, last_chunk_mask);
+      printer->Print("if (_has_bits_[$index$ / 32] & $mask$u) {\n", "index",
+                     SimpleItoa(last_chunk * 8), "mask",
+                     SimpleItoa(last_chunk_mask));
+      printer->Indent();
+    }
 
-      const int count = popcnt(last_chunk_mask);
-      const bool have_outer_if = HasFieldPresence(descriptor_->file()) &&
-          (last_chunk_start != last_chunk_end);
+    // Go back and emit checks for each of the fields we processed.
+    for (int j = 0; j < chunk.size(); j++) {
+      const FieldDescriptor* field = chunk[j];
+      const FieldGenerator& generator = field_generators_.get(field);
 
-      if (have_outer_if) {
-        // Check (up to) 8 has_bits at a time if we have more than one field in
-        // this chunk.  Due to field layout ordering, we may check
-        // _has_bits_[last_chunk * 8 / 32] multiple times.
-        GOOGLE_DCHECK_LE(2, count);
-        GOOGLE_DCHECK_GE(8, count);
+      PrintFieldComment(printer, field);
 
-        printer->Print(
-          "if (_has_bits_[$index$ / 32] & $mask$u) {\n",
-          "index", SimpleItoa(last_chunk * 8),
-          "mask", SimpleItoa(last_chunk_mask));
+      bool have_enclosing_if = false;
+      if (HasFieldPresence(descriptor_->file())) {
+        printer->Print("if (has_$name$()) {\n", "name", FieldName(field));
         printer->Indent();
+        have_enclosing_if = true;
+      } else {
+        // Without field presence: field is serialized only if it has a
+        // non-default value.
+        have_enclosing_if =
+            EmitFieldNonDefaultCondition(printer, "this->", field);
       }
 
-      // Go back and emit checks for each of the fields we processed.
-      for (int j = last_chunk_start; j <= last_chunk_end; j++) {
-        const FieldDescriptor* field = optimized_order_[j];
-        const FieldGenerator& generator = field_generators_.get(field);
-
-        PrintFieldComment(printer, field);
-
-        bool have_enclosing_if = false;
-        if (HasFieldPresence(descriptor_->file())) {
-          printer->Print(
-            "if (has_$name$()) {\n",
-            "name", FieldName(field));
-          printer->Indent();
-          have_enclosing_if = true;
-        } else {
-          // Without field presence: field is serialized only if it has a
-          // non-default value.
-          have_enclosing_if = EmitFieldNonDefaultCondition(
-              printer, "this->", field);
-        }
-
-        generator.GenerateByteSize(printer);
+      generator.GenerateByteSize(printer);
 
-        if (have_enclosing_if) {
-          printer->Outdent();
-          printer->Print(
+      if (have_enclosing_if) {
+        printer->Outdent();
+        printer->Print(
             "}\n"
             "\n");
-        }
       }
+    }
 
-      if (have_outer_if) {
-        printer->Outdent();
-        printer->Print("}\n");
-      }
+    if (have_outer_if) {
+      printer->Outdent();
+      printer->Print("}\n");
     }
   }
 
@@ -3783,17 +4217,23 @@ GenerateByteSize(io::Printer* printer) {
         "}\n");
   }
 
-  // We update _cached_size_ even though this is a const method.  In theory,
-  // this is not thread-compatible, because concurrent writes have undefined
-  // results.  In practice, since any concurrent writes will be writing the
-  // exact same value, it works on all common processors.  In a future version
-  // of C++, _cached_size_ should be made into an atomic<int>.
+  if (num_weak_fields_) {
+    // TagSize + MessageSize
+    printer->Print("total_size += _weak_field_map_.ByteSizeLong();\n");
+  }
+
+  // We update _cached_size_ even though this is a const method.  Because
+  // const methods might be called concurrently this needs to be atomic
+  // operations or the program is undefined.  In practice, since any concurrent
+  // writes will be writing the exact same value, normal writes will work on
+  // all common processors. We use a dedicated wrapper class to abstract away
+  // the underlying atomic. This makes it easier on platforms where even relaxed
+  // memory order might have perf impact to replace it with ordinary loads and
+  // stores.
   printer->Print(
-    "int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);\n"
-    "GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();\n"
-    "_cached_size_ = cached_size;\n"
-    "GOOGLE_SAFE_CONCURRENT_WRITES_END();\n"
-    "return total_size;\n");
+      "int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);\n"
+      "SetCachedSize(cached_size);\n"
+      "return total_size;\n");
 
   printer->Outdent();
   printer->Print("}\n");
@@ -3840,26 +4280,35 @@ GenerateIsInitialized(io::Printer* printer) {
     // TODO(ckennelly): Push this down into a generator?
     if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
         !ShouldIgnoreRequiredFieldCheck(field, options_) &&
-        HasRequiredFields(field->message_type(), options_)) {
+        scc_analyzer_->HasRequiredFields(field->message_type())) {
       if (field->is_repeated()) {
-        printer->Print(
-          "if (!::google::protobuf::internal::AllAreInitialized(this->$name$()))"
-          " return false;\n",
-          "name", FieldName(field));
+        if (IsImplicitWeakField(field, options_, scc_analyzer_)) {
+          printer->Print(
+            "if (!::google::protobuf::internal::AllAreInitializedWeak(this->$name$_))"
+            " return false;\n",
+            "name", FieldName(field));
+        } else {
+          printer->Print(
+            "if (!::google::protobuf::internal::AllAreInitialized(this->$name$()))"
+            " return false;\n",
+            "name", FieldName(field));
+        }
+      } else if (field->options().weak()) {
+        continue;
       } else {
-        GOOGLE_CHECK(field->options().weak() || !field->containing_oneof());
-        // For weak fields, use the data member (::google::protobuf::Message*) instead
-        // of the getter to avoid a link dependency on the weak message type
-        // which is only forward declared.
+        GOOGLE_CHECK(!field->containing_oneof());
         printer->Print(
             "if (has_$name$()) {\n"
             "  if (!this->$name$_->IsInitialized()) return false;\n"
             "}\n",
-          "name", FieldName(field));
+            "name", FieldName(field));
       }
     }
   }
-
+  if (num_weak_fields_) {
+    // For Weak fields.
+    printer->Print("if (!_weak_field_map_.IsInitialized()) return false;\n");
+  }
   // Go through the oneof fields, emitting a switch if any might have required
   // fields.
   for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
@@ -3871,7 +4320,7 @@ GenerateIsInitialized(io::Printer* printer) {
 
       if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
           !ShouldIgnoreRequiredFieldCheck(field, options_) &&
-          HasRequiredFields(field->message_type(), options_)) {
+          scc_analyzer_->HasRequiredFields(field->message_type())) {
         has_required_fields = true;
         break;
       }
@@ -3894,17 +4343,10 @@ GenerateIsInitialized(io::Printer* printer) {
 
       if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
           !ShouldIgnoreRequiredFieldCheck(field, options_) &&
-          HasRequiredFields(field->message_type(), options_)) {
+          scc_analyzer_->HasRequiredFields(field->message_type())) {
         GOOGLE_CHECK(!(field->options().weak() || !field->containing_oneof()));
         if (field->options().weak()) {
-          // For weak fields, use the data member (::google::protobuf::Message*) instead
-          // of the getter to avoid a link dependency on the weak message type
-          // which is only forward declared.
-          printer->Print(
-              "if (has_$name$()) {\n"
-              "  if (!this->$name$_->IsInitialized()) return false;\n"
-              "}\n",
-            "name", FieldName(field));
+          // Just skip.
         } else {
           printer->Print(
             "if (has_$name$()) {\n"
@@ -3937,7 +4379,6 @@ GenerateIsInitialized(io::Printer* printer) {
     "}\n");
 }
 
-
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/cpp/cpp_message.h b/src/google/protobuf/compiler/cpp/cpp_message.h
index 1a804a16..ca2ca2c9 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message.h
+++ b/src/google/protobuf/compiler/cpp/cpp_message.h
@@ -36,12 +36,11 @@
 #define GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
 #include <string>
 #include <google/protobuf/compiler/cpp/cpp_field.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
+#include <google/protobuf/compiler/cpp/cpp_message_layout_helper.h>
 #include <google/protobuf/compiler/cpp/cpp_options.h>
 
 namespace google {
@@ -61,11 +60,10 @@ class ExtensionGenerator;      // extension.h
 class MessageGenerator {
  public:
   // See generator.cc for the meaning of dllexport_decl.
-  MessageGenerator(const Descriptor* descriptor, const Options& options);
+  MessageGenerator(const Descriptor* descriptor, int index_in_file_messages,
+                   const Options& options, SCCAnalyzer* scc_analyzer);
   ~MessageGenerator();
 
-  // Appends the pre-order walk of the nested generators to list.
-  void Flatten(std::vector<MessageGenerator*>* list);
   // Append the two types of nested generators to the corresponding vector.
   void AddGenerators(std::vector<EnumGenerator*>* enum_generators,
                      std::vector<ExtensionGenerator*>* extension_generators);
@@ -84,47 +82,48 @@ class MessageGenerator {
 
   // Generate definitions of inline methods (placed at the end of the header
   // file).
-  void GenerateInlineMethods(io::Printer* printer, bool is_inline);
-
-  // Dependent methods are always inline.
-  void GenerateDependentInlineMethods(io::Printer* printer);
+  void GenerateInlineMethods(io::Printer* printer);
 
   // Source file stuff.
 
   // Generate extra fields
   void GenerateExtraDefaultFields(io::Printer* printer);
 
-  // Generate code that calls MessageFactory::InternalRegisterGeneratedMessage()
-  // for all types.
-  void GenerateTypeRegistrations(io::Printer* printer);
-
-  // Generates code that allocates the message's default instance.
-  void GenerateDefaultInstanceAllocator(io::Printer* printer);
+  // Generates code that creates default instances for fields.
+  void GenerateFieldDefaultInstances(io::Printer* printer);
 
   // Generates code that initializes the message's default instance.  This
   // is separate from allocating because all default instances must be
   // allocated before any can be initialized.
   void GenerateDefaultInstanceInitializer(io::Printer* printer);
 
-  // Generates code that should be run when ShutdownProtobufLibrary() is called,
-  // to delete all dynamically-allocated objects.
-  void GenerateShutdownCode(io::Printer* printer);
-
   // Generate all non-inline methods for this class.
   void GenerateClassMethods(io::Printer* printer);
 
+  // Generate source file code that should go outside any namespace.
+  void GenerateSourceInProto2Namespace(io::Printer* printer);
+
  private:
   // Generate declarations and definitions of accessors for fields.
-  void GenerateDependentBaseClassDefinition(io::Printer* printer);
-  void GenerateDependentFieldAccessorDeclarations(io::Printer* printer);
   void GenerateFieldAccessorDeclarations(io::Printer* printer);
-  void GenerateDependentFieldAccessorDefinitions(io::Printer* printer);
-  void GenerateFieldAccessorDefinitions(io::Printer* printer, bool is_inline);
+  void GenerateFieldAccessorDefinitions(io::Printer* printer);
+
+  // Generate the table-driven parsing array.  Returns the number of entries
+  // generated.
+  size_t GenerateParseOffsets(io::Printer* printer);
+  size_t GenerateParseAuxTable(io::Printer* printer);
+  // Generates a ParseTable entry.  Returns whether the proto uses table-driven
+  // parsing.
+  bool GenerateParseTable(io::Printer* printer, size_t offset,
+                          size_t aux_offset);
 
   // Generate the field offsets array.  Returns the a pair of the total numer
   // of entries generated and the index of the first has_bit entry.
   std::pair<size_t, size_t> GenerateOffsets(io::Printer* printer);
   void GenerateSchema(io::Printer* printer, int offset, int has_offset);
+  // For each field generates a table entry describing the field for the
+  // table driven serializer.
+  int GenerateFieldMetadata(io::Printer* printer);
 
   // Generate constructors and destructor.
   void GenerateStructors(io::Printer* printer);
@@ -140,6 +139,13 @@ class MessageGenerator {
   // Generate the arena-specific destructor code.
   void GenerateArenaDestructorCode(io::Printer* printer);
 
+  // Helper for GenerateClear and others.  Optionally emits a condition that
+  // assumes the existence of the cached_has_bits variable, and returns true if
+  // the condition was printed.
+  bool MaybeGenerateOptionalFieldCondition(io::Printer* printer,
+                                           const FieldDescriptor* field,
+                                           int expected_has_bits_index);
+
   // Generate standard Message methods.
   void GenerateClear(io::Printer* printer);
   void GenerateOneofClear(io::Printer* printer);
@@ -155,9 +161,14 @@ class MessageGenerator {
   void GenerateIsInitialized(io::Printer* printer);
 
   // Helpers for GenerateSerializeWithCachedSizes().
+  //
+  // cached_has_bit_index maintains that:
+  //   cached_has_bits = _has_bits_[cached_has_bit_index]
+  // for cached_has_bit_index >= 0
   void GenerateSerializeOneField(io::Printer* printer,
                                  const FieldDescriptor* field,
-                                 bool unbounded);
+                                 bool unbounded,
+                                 int cached_has_bits_index);
   // Generate a switch statement to serialize 2+ fields from the same oneof.
   // Or, if fields.size() == 1, just call GenerateSerializeOneField().
   void GenerateSerializeOneofFields(
@@ -167,13 +178,12 @@ class MessageGenerator {
       io::Printer* printer, const Descriptor::ExtensionRange* range,
       bool unbounded);
 
-
   // Generates has_foo() functions and variables for singular field has-bits.
   void GenerateSingularFieldHasBits(const FieldDescriptor* field,
                                     std::map<string, string> vars,
                                     io::Printer* printer);
   // Generates has_foo() functions and variables for oneof field has-bits.
-  void GenerateOneofHasBits(io::Printer* printer, bool is_inline);
+  void GenerateOneofHasBits(io::Printer* printer);
   // Generates has_foo_bar() functions for oneof members.
   void GenerateOneofMemberHasBits(const FieldDescriptor* field,
                                   const std::map<string, string>& vars,
@@ -181,6 +191,7 @@ class MessageGenerator {
   // Generates the clear_foo() method for a field.
   void GenerateFieldClear(const FieldDescriptor* field,
                           const std::map<string, string>& vars,
+                          bool is_inline,
                           io::Printer* printer);
 
   void GenerateConstructorBody(io::Printer* printer,
@@ -191,23 +202,28 @@ class MessageGenerator {
   std::vector<uint32> RequiredFieldsBitMask() const;
 
   const Descriptor* descriptor_;
+  int index_in_file_messages_;
   string classname_;
   Options options_;
   FieldGeneratorMap field_generators_;
   // optimized_order_ is the order we layout the message's fields in the class.
   // This is reused to initialize the fields in-order for cache efficiency.
   //
-  // optimized_order_ excludes oneof fields.
+  // optimized_order_ excludes oneof fields and weak fields.
   std::vector<const FieldDescriptor *> optimized_order_;
   std::vector<int> has_bit_indices_;
   int max_has_bit_index_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<MessageGenerator> > nested_generators_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<EnumGenerator> > enum_generators_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ExtensionGenerator> > extension_generators_;
+  std::unique_ptr<std::unique_ptr<EnumGenerator> []> enum_generators_;
+  std::unique_ptr<std::unique_ptr<ExtensionGenerator> []> extension_generators_;
   int num_required_fields_;
-  bool use_dependent_base_;
+  int num_weak_fields_;
+  // table_driven_ indicates the generated message uses table-driven parsing.
+  bool table_driven_;
+
+  std::unique_ptr<MessageLayoutHelper> message_layout_helper_;
 
-  int index_in_metadata_;
+  SCCAnalyzer* scc_analyzer_;
+  string scc_name_;
 
   friend class FileGenerator;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageGenerator);
diff --git a/src/google/protobuf/compiler/cpp/cpp_message_field.cc b/src/google/protobuf/compiler/cpp/cpp_message_field.cc
index c3d1745c..c1e15c52 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_message_field.cc
@@ -35,6 +35,7 @@
 #include <google/protobuf/compiler/cpp/cpp_message_field.h>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/io/printer.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -44,15 +45,43 @@ namespace cpp {
 
 namespace {
 
+// When we are generating code for implicit weak fields, we need to insert some
+// additional casts. These functions return the casted expression if
+// implicit_weak_field is true but otherwise return the original expression.
+// Ordinarily a static_cast is enough to cast google::protobuf::MessageLite* to a class
+// deriving from it, but we need a reinterpret_cast in cases where the generated
+// message is forward-declared but its full definition is not visible.
+string StaticCast(const string& type, const string& expression,
+                  bool implicit_weak_field) {
+  if (implicit_weak_field) {
+    return "static_cast< " + type + " >(" + expression + ")";
+  } else {
+    return expression;
+  }
+}
+
+string ReinterpretCast(const string& type, const string& expression,
+                       bool implicit_weak_field) {
+  if (implicit_weak_field) {
+    return "reinterpret_cast< " + type + " >(" + expression + ")";
+  } else {
+    return expression;
+  }
+}
+
 void SetMessageVariables(const FieldDescriptor* descriptor,
-                         std::map<string, string>* variables,
-                         const Options& options) {
+                         const Options& options, bool implicit_weak,
+                         std::map<string, string>* variables) {
   SetCommonFieldVariables(descriptor, variables, options);
   (*variables)["type"] = FieldMessageTypeName(descriptor);
-  if (descriptor->options().weak() || !descriptor->containing_oneof()) {
-    (*variables)["non_null_ptr_to_name"] =
-        StrCat("this->", (*variables)["name"], "_");
-  }
+  (*variables)["casted_member"] = ReinterpretCast(
+      (*variables)["type"] + "*", (*variables)["name"] + "_", implicit_weak);
+  (*variables)["type_default_instance"] =
+      DefaultInstanceName(descriptor->message_type());
+  (*variables)["type_reference_function"] =
+      implicit_weak
+          ? ("  " + ReferenceFunctionName(descriptor->message_type()) + "();\n")
+          : "";
   (*variables)["stream_writer"] =
       (*variables)["declared_type"] +
       (HasFastArraySerialization(descriptor->message_type()->file(), options)
@@ -64,14 +93,6 @@ void SetMessageVariables(const FieldDescriptor* descriptor,
       SafeFunctionName(descriptor->containing_type(),
                        descriptor, "release_");
   (*variables)["full_name"] = descriptor->full_name();
-  if (options.proto_h && IsFieldDependent(descriptor)) {
-    (*variables)["dependent_type"] = "T::" + DependentTypeName(descriptor);
-    (*variables)["dependent_typename"] =
-        "typename T::" + DependentTypeName(descriptor);
-  } else {
-    (*variables)["dependent_type"] = FieldMessageTypeName(descriptor);
-    (*variables)["dependent_typename"] = FieldMessageTypeName(descriptor);
-  }
 }
 
 }  // namespace
@@ -79,119 +100,106 @@ void SetMessageVariables(const FieldDescriptor* descriptor,
 // ===================================================================
 
 MessageFieldGenerator::MessageFieldGenerator(const FieldDescriptor* descriptor,
-                                             const Options& options)
+                                             const Options& options,
+                                             SCCAnalyzer* scc_analyzer)
     : FieldGenerator(options),
       descriptor_(descriptor),
-      dependent_field_(options.proto_h && IsFieldDependent(descriptor)) {
-  SetMessageVariables(descriptor, &variables_, options);
+      implicit_weak_field_(
+          IsImplicitWeakField(descriptor, options, scc_analyzer)) {
+  SetMessageVariables(descriptor, options, implicit_weak_field_, &variables_);
 }
 
 MessageFieldGenerator::~MessageFieldGenerator() {}
 
 void MessageFieldGenerator::
 GeneratePrivateMembers(io::Printer* printer) const {
-  printer->Print(variables_, "$type$* $name$_;\n");
-}
-
-void MessageFieldGenerator::
-GenerateGetterDeclaration(io::Printer* printer) const {
-  printer->Print(variables_,
-      "$deprecated_attr$const $type$& $name$() const;\n");
-}
-
-void MessageFieldGenerator::
-GenerateDependentAccessorDeclarations(io::Printer* printer) const {
-  if (!dependent_field_) {
-    return;
+  if (implicit_weak_field_) {
+    printer->Print(variables_, "::google::protobuf::MessageLite* $name$_;\n");
+  } else {
+    printer->Print(variables_, "$type$* $name$_;\n");
   }
-  // Arena manipulation code is out-of-line in the derived message class.
-  printer->Print(variables_,
-    "$deprecated_attr$$type$* mutable_$name$();\n"
-    "$deprecated_attr$$type$* $release_name$();\n"
-    "$deprecated_attr$void set_allocated_$name$($type$* $name$);\n");
 }
 
 void MessageFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
-  if (SupportsArenas(descriptor_)) {
+  if (implicit_weak_field_) {
+    // These private accessors are used by MergeFrom and
+    // MergePartialFromCodedStream, and their purpose is to provide access to
+    // the field without creating a strong dependency on the message type.
     printer->Print(variables_,
        "private:\n"
-       "void _slow_mutable_$name$();\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables_,
-       "void _slow_set_allocated_$name$(\n"
-       "    ::google::protobuf::Arena* message_arena, $type$** $name$);\n");
-    }
-    printer->Print(variables_,
-       "$type$* _slow_$release_name$();\n"
+       "const ::google::protobuf::MessageLite& _internal_$name$() const;\n"
+       "::google::protobuf::MessageLite* _internal_mutable_$name$();\n"
        "public:\n");
-  }
-  GenerateGetterDeclaration(printer);
-  if (!dependent_field_) {
+  } else {
+    // This inline accessor directly returns member field and is used in
+    // Serialize such that AFDO profile correctly captures access information to
+    // message fields under serialize.
     printer->Print(variables_,
-      "$deprecated_attr$$type$* mutable_$name$();\n"
-      "$deprecated_attr$$type$* $release_name$();\n"
-      "$deprecated_attr$void set_allocated_$name$($type$* $name$);\n");
+       "private:\n"
+       "const $type$& _internal_$name$() const;\n"
+       "public:\n");
   }
+  printer->Print(variables_,
+      "$deprecated_attr$const $type$& $name$() const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_, "$deprecated_attr$$type$* $release_name$();\n");
+  printer->Annotate("release_name", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$$type$* ${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$set_allocated_$name$$}$"
+                 "($type$* $name$);\n");
+  printer->Annotate("{", "}", descriptor_);
   if (SupportsArenas(descriptor_)) {
     printer->Print(variables_,
-      "$deprecated_attr$$type$* unsafe_arena_release_$name$();\n"
-      "$deprecated_attr$void unsafe_arena_set_allocated_$name$(\n"
-      "    $type$* $name$);\n");
+                   "$deprecated_attr$void "
+                   "${$unsafe_arena_set_allocated_$name$$}$(\n"
+                   "    $type$* $name$);\n");
+    printer->Annotate("{", "}", descriptor_);
+    printer->Print(
+        variables_,
+        "$deprecated_attr$$type$* ${$unsafe_arena_release_$name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
 void MessageFieldGenerator::GenerateNonInlineAccessorDefinitions(
     io::Printer* printer) const {
-  if (SupportsArenas(descriptor_)) {
+  if (implicit_weak_field_) {
     printer->Print(variables_,
-      "void $classname$::_slow_mutable_$name$() {\n");
-      if (SupportsArenas(descriptor_->message_type())) {
-        printer->Print(variables_,
-          "  $name$_ = ::google::protobuf::Arena::CreateMessage< $type$ >(\n"
-          "      GetArenaNoVirtual());\n");
-      } else {
-        printer->Print(variables_,
-          "  $name$_ = ::google::protobuf::Arena::Create< $type$ >(\n"
-          "      GetArenaNoVirtual());\n");
-      }
-    printer->Print(variables_,
-      "}\n"
-      "$type$* $classname$::_slow_$release_name$() {\n"
-      "  if ($name$_ == NULL) {\n"
-      "    return NULL;\n"
+      "const ::google::protobuf::MessageLite& $classname$::_internal_$name$() const {\n"
+      "  if ($name$_ != NULL) {\n"
+      "    return *$name$_;\n"
+      "  } else if (&$type_default_instance$ != NULL) {\n"
+      "    return *reinterpret_cast<const ::google::protobuf::MessageLite*>(\n"
+      "        &$type_default_instance$);\n"
       "  } else {\n"
-      "    $type$* temp = new $type$(*$name$_);\n"
-      "    $name$_ = NULL;\n"
-      "    return temp;\n"
+      "    return "
+      "*::google::protobuf::internal::ImplicitWeakMessage::default_instance();\n"
       "  }\n"
-      "}\n"
-      "$type$* $classname$::unsafe_arena_release_$name$() {\n"
-      "  // @@protoc_insertion_point(field_unsafe_arena_release:$full_name$)\n"
-      "  $clear_hasbit$\n"
-      "  $type$* temp = $name$_;\n"
-      "  $name$_ = NULL;\n"
-      "  return temp;\n"
       "}\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      // NOTE: the same logic is mirrored in weak_message_field.cc. Any
-      // arena-related semantics changes should be made in both places.
+  }
+  if (SupportsArenas(descriptor_)) {
+    if (implicit_weak_field_) {
       printer->Print(variables_,
-          "void $classname$::_slow_set_allocated_$name$(\n"
-          "    ::google::protobuf::Arena* message_arena, $type$** $name$) {\n"
-          "    if (message_arena != NULL && \n"
-          "        ::google::protobuf::Arena::GetArena(*$name$) == NULL) {\n"
-          "      message_arena->Own(*$name$);\n"
-          "    } else if (message_arena !=\n"
-          "               ::google::protobuf::Arena::GetArena(*$name$)) {\n"
-          "      $type$* new_$name$ = \n"
-          "            ::google::protobuf::Arena::CreateMessage< $type$ >(\n"
-          "            message_arena);\n"
-          "      new_$name$->CopyFrom(**$name$);\n"
-          "      *$name$ = new_$name$;\n"
-          "    }\n"
-          "}\n");
+        "::google::protobuf::MessageLite* $classname$::_internal_mutable_$name$() {\n"
+        "  $set_hasbit$\n"
+        "  if ($name$_ == NULL) {\n"
+        "    if (&$type_default_instance$ == NULL) {\n"
+        "      $name$_ = ::google::protobuf::Arena::CreateMessage<\n"
+        "          ::google::protobuf::internal::ImplicitWeakMessage>(\n"
+        "              GetArenaNoVirtual());\n"
+        "    } else {\n"
+        "      $name$_ = reinterpret_cast<const ::google::protobuf::MessageLite*>(\n"
+        "          &$type_default_instance$)->New(GetArenaNoVirtual());\n"
+        "    }\n"
+        "  }\n"
+        "  return $name$_;\n"
+        "}\n");
     }
+
     printer->Print(variables_,
       "void $classname$::unsafe_arena_set_allocated_$name$(\n"
       "    $type$* $name$) {\n"
@@ -209,279 +217,152 @@ void MessageFieldGenerator::GenerateNonInlineAccessorDefinitions(
       "  // @@protoc_insertion_point(field_unsafe_arena_set_allocated"
       ":$full_name$)\n"
       "}\n");
+  } else if (implicit_weak_field_) {
+    printer->Print(variables_,
+        "::google::protobuf::MessageLite* $classname$::_internal_mutable_$name$() {\n"
+        "  $set_hasbit$\n"
+        "  if ($name$_ == NULL) {\n"
+        "    if (&$type_default_instance$ == NULL) {\n"
+        "      $name$_ = new ::google::protobuf::internal::ImplicitWeakMessage;\n"
+        "    } else {\n"
+        "      $name$_ = reinterpret_cast<const ::google::protobuf::MessageLite*>(\n"
+        "          &$type_default_instance$)->New();\n"
+        "    }\n"
+        "  }\n"
+        "  return $name$_;\n"
+        "}\n");
   }
 }
 
 void MessageFieldGenerator::
-GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const {
-  if (!dependent_field_) {
-    return;
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  if (!implicit_weak_field_) {
+    printer->Print(variables_,
+      "inline const $type$& $classname$::_internal_$name$() const {\n"
+      "  return *$field_member$;\n"
+      "}\n");
   }
+  printer->Print(variables_,
+    "inline const $type$& $classname$::$name$() const {\n"
+    "  const $type$* p = $casted_member$;\n"
+    "  // @@protoc_insertion_point(field_get:$full_name$)\n"
+    "  return p != NULL ? *p : *reinterpret_cast<const $type$*>(\n"
+    "      &$type_default_instance$);\n"
+    "}\n");
 
-  std::map<string, string> variables(variables_);
-  // For the CRTP base class, all mutation methods are dependent, and so
-  // they must be in the header.
-  variables["dependent_classname"] =
-      DependentBaseClassTemplateName(descriptor_->containing_type()) + "<T>";
-  variables["this_message"] = DependentBaseDownCast();
-  if (!variables["set_hasbit"].empty()) {
-    variables["set_hasbit"] =
-        variables["this_message"] + variables["set_hasbit"];
-  }
-  if (!variables["clear_hasbit"].empty()) {
-    variables["clear_hasbit"] =
-        variables["this_message"] + variables["clear_hasbit"];
+  printer->Print(variables_,
+    "inline $type$* $classname$::$release_name$() {\n"
+    "  // @@protoc_insertion_point(field_release:$full_name$)\n"
+    "$type_reference_function$"
+    "  $clear_hasbit$\n"
+    "  $type$* temp = $casted_member$;\n");
+  if (SupportsArenas(descriptor_)) {
+    printer->Print(variables_,
+      "  if (GetArenaNoVirtual() != NULL) {\n"
+      "    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);\n"
+      "  }\n");
   }
+  printer->Print(variables_,
+    "  $name$_ = NULL;\n"
+    "  return temp;\n"
+    "}\n");
 
   if (SupportsArenas(descriptor_)) {
-    printer->Print(variables,
-      "template <class T>\n"
-      "inline $type$* $dependent_classname$::mutable_$name$() {\n"
-      "  $set_hasbit$\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  if ($name$_ == NULL) {\n"
-      "    $this_message$_slow_mutable_$name$();\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $name$_;\n"
-      "}\n"
-      "template <class T>\n"
-      "inline $type$* $dependent_classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  $clear_hasbit$\n"
-      "  if ($this_message$GetArenaNoVirtual() != NULL) {\n"
-      "    return $this_message$_slow_$release_name$();\n"
-      "  } else {\n"
-      "    $dependent_typename$* temp = $name$_;\n"
-      "    $name$_ = NULL;\n"
-      "    return temp;\n"
-      "  }\n"
-      "}\n"
-      "template <class T>\n"
-      "inline void $dependent_classname$::"
-      "set_allocated_$name$($type$* $name$) {\n"
-      "  ::google::protobuf::Arena* message_arena = $this_message$GetArenaNoVirtual();\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  if (message_arena == NULL) {\n"
-      "    delete $name$_;\n"
-      "  }\n"
-      "  if ($name$ != NULL) {\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      // If we're on an arena and the incoming message is not, simply Own() it
-      // rather than copy to the arena -- either way we need a heap dealloc,
-      // so we might as well defer it. Otherwise, if incoming message is on a
-      // different ownership domain (specific arena, or the heap) than we are,
-      // copy to our arena (or heap, as the case may be).
-      printer->Print(variables,
-        "    $this_message$_slow_set_allocated_$name$(message_arena, "
-        "&$name$);\n");
-    } else {
-      printer->Print(variables,
-        "    if (message_arena != NULL) {\n"
-        "      message_arena->Own($name$);\n"
-        "    }\n");
-    }
-    printer->Print(variables,
-      "  }\n"
-      "  $name$_ = $name$;\n"
-      "  if ($name$) {\n"
-      "    $set_hasbit$\n"
-      "  } else {\n"
-      "    $clear_hasbit$\n"
-      "  }\n"
-      // TODO(dlj): move insertion points to message class.
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-      "}\n");
-  } else {
-    printer->Print(variables,
-      "template <class T>\n"
-      "inline $type$* $dependent_classname$::mutable_$name$() {\n"
-      "  $set_hasbit$\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  if ($name$_ == NULL) {\n"
-      "    $name$_ = new $dependent_typename$;\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $name$_;\n"
-      "}\n"
-      "template <class T>\n"
-      "inline $type$* $dependent_classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
+    printer->Print(variables_,
+      "inline $type$* $classname$::unsafe_arena_release_$name$() {\n"
+      "  // @@protoc_insertion_point(field_unsafe_arena_release:$full_name$)\n"
+      "$type_reference_function$"
       "  $clear_hasbit$\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  $dependent_typename$* temp = $name$_;\n"
+      "  $type$* temp = $casted_member$;\n"
       "  $name$_ = NULL;\n"
       "  return temp;\n"
-      "}\n"
-      "template <class T>\n"
-      "inline void $dependent_classname$::"
-      "set_allocated_$name$($type$* $name$) {\n"
-      "  $dependent_typename$*& $name$_ = $this_message$$name$_;\n"
-      "  delete $name$_;\n");
-
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables,
-      "  if ($name$ != NULL && static_cast< $dependent_typename$* >($name$)"
-      "->GetArena() != NULL) {\n"
-      "    $dependent_typename$* new_$name$ = new $dependent_typename$;\n"
-      "    new_$name$->CopyFrom(*$name$);\n"
-      "    $name$ = new_$name$;\n"
-      "  }\n");
-    }
-
-    printer->Print(variables,
-      "  $name$_ = $name$;\n"
-      "  if ($name$) {\n"
-      "    $set_hasbit$\n"
-      "  } else {\n"
-      "    $clear_hasbit$\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
       "}\n");
   }
-}
 
-void MessageFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  if (dependent_field_) {
-    // for dependent fields we cannot access its internal_default_instance,
-    // because the type is incomplete.
-    // TODO(gerbens) deprecate dependent base class.
-    std::map<string, string> variables(variables_);
-    variables["inline"] = is_inline ? "inline " : "";
-    printer->Print(variables,
-      "$inline$const $type$& $classname$::$name$() const {\n"
-      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-      "  return $name$_ != NULL ? *$name$_\n"
-      "                         : *internal_default_instance()->$name$_;\n"
-      "}\n");
-    return;
+  printer->Print(variables_,
+    "inline $type$* $classname$::mutable_$name$() {\n"
+    "  $set_hasbit$\n"
+    "  if ($name$_ == NULL) {\n"
+    "    auto* p = CreateMaybeMessage<$type$>(GetArenaNoVirtual());\n");
+  if (implicit_weak_field_) {
+    printer->Print(variables_,
+      "    $name$_ = reinterpret_cast<::google::protobuf::MessageLite*>(p);\n");
+  } else {
+    printer->Print(variables_,
+      "    $name$_ = p;\n");
   }
-
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$const $type$& $classname$::$name$() const {\n"
-    "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-    "  return $name$_ != NULL ? *$name$_\n"
-    "                         : *$type$::internal_default_instance();\n"
+  printer->Print(variables_,
+    "  }\n"
+    "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
+    "  return $casted_member$;\n"
     "}\n");
 
-  if (SupportsArenas(descriptor_)) {
-    printer->Print(variables,
-      "$inline$"
-      "$type$* $classname$::mutable_$name$() {\n"
-      "  $set_hasbit$\n"
-      "  if ($name$_ == NULL) {\n"
-      "    _slow_mutable_$name$();\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $name$_;\n"
-      "}\n"
-      "$inline$"
-      "$type$* $classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
-      "  $clear_hasbit$\n"
-      "  if (GetArenaNoVirtual() != NULL) {\n"
-      "    return _slow_$release_name$();\n"
-      "  } else {\n"
-      "    $type$* temp = $name$_;\n"
-      "    $name$_ = NULL;\n"
-      "    return temp;\n"
-      "  }\n"
-      "}\n"
-      "$inline$ "
-      "void $classname$::set_allocated_$name$($type$* $name$) {\n"
-      "  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();\n"
-      "  if (message_arena == NULL) {\n"
-      "    delete $name$_;\n"
-      "  }\n"
-      "  if ($name$ != NULL) {\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      // If we're on an arena and the incoming message is not, simply Own() it
-      // rather than copy to the arena -- either way we need a heap dealloc,
-      // so we might as well defer it. Otherwise, if incoming message is on a
-      // different ownership domain (specific arena, or the heap) than we are,
-      // copy to our arena (or heap, as the case may be).
-      printer->Print(variables,
-        "    _slow_set_allocated_$name$(message_arena, &$name$);\n");
-    } else {
-      printer->Print(variables,
-        "    if (message_arena != NULL) {\n"
-        "      message_arena->Own($name$);\n"
-        "    }\n");
-    }
-    printer->Print(variables,
-      "  }\n"
-      "  $name$_ = $name$;\n"
-      "  if ($name$) {\n"
-      "    $set_hasbit$\n"
-      "  } else {\n"
-      "    $clear_hasbit$\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-      "}\n");
+  // We handle the most common case inline, and delegate less common cases to
+  // the slow fallback function.
+  printer->Print(variables_,
+    "inline void $classname$::set_allocated_$name$($type$* $name$) {\n"
+    "  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();\n");
+  printer->Print(variables_,
+    "  if (message_arena == NULL) {\n");
+  if (IsCrossFileMessage(descriptor_)) {
+    printer->Print(variables_,
+      "    delete reinterpret_cast< ::google::protobuf::MessageLite*>($name$_);\n");
   } else {
-    printer->Print(variables,
-      "$inline$"
-      "$type$* $classname$::mutable_$name$() {\n"
-      "  $set_hasbit$\n"
-      "  if ($name$_ == NULL) {\n"
-      "    $name$_ = new $type$;\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $name$_;\n"
-      "}\n"
-      "$inline$"
-      "$type$* $classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
-      "  $clear_hasbit$\n"
-      "  $type$* temp = $name$_;\n"
-      "  $name$_ = NULL;\n"
-      "  return temp;\n"
-      "}\n"
-      "$inline$"
-      "void $classname$::set_allocated_$name$($type$* $name$) {\n"
-      "  delete $name$_;\n");
-
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables,
-      "  if ($name$ != NULL && $name$->GetArena() != NULL) {\n"
-      "    $type$* new_$name$ = new $type$;\n"
-      "    new_$name$->CopyFrom(*$name$);\n"
-      "    $name$ = new_$name$;\n"
-      "  }\n");
-    }
-
-    printer->Print(variables,
-      "  $name$_ = $name$;\n"
-      "  if ($name$) {\n"
-      "    $set_hasbit$\n"
-      "  } else {\n"
-      "    $clear_hasbit$\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-      "}\n");
+    printer->Print(variables_,
+      "    delete $name$_;\n");
   }
+  printer->Print(variables_,
+    "  }\n"
+    "  if ($name$) {\n");
+  if (SupportsArenas(descriptor_->message_type()) &&
+      IsCrossFileMessage(descriptor_)) {
+    // We have to read the arena through the virtual method, because the type
+    // isn't defined in this file.
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena =\n"
+      "      reinterpret_cast<::google::protobuf::MessageLite*>($name$)->GetArena();\n");
+  } else if (!SupportsArenas(descriptor_->message_type())) {
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena = NULL;\n");
+  } else {
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena =\n"
+      "      ::google::protobuf::Arena::GetArena($name$);\n");
+  }
+  printer->Print(variables_,
+    "    if (message_arena != submessage_arena) {\n"
+    "      $name$ = ::google::protobuf::internal::GetOwnedMessage(\n"
+    "          message_arena, $name$, submessage_arena);\n"
+    "    }\n"
+    "    $set_hasbit$\n"
+    "  } else {\n"
+    "    $clear_hasbit$\n"
+    "  }\n");
+  if (implicit_weak_field_) {
+    printer->Print(variables_,
+      "  $name$_ = reinterpret_cast<MessageLite*>($name$);\n");
+  } else {
+    printer->Print(variables_,
+      "  $name$_ = $name$;\n");
+  }
+  printer->Print(variables_,
+    "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
+    "}\n");
 }
 
 void MessageFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  variables["this_message"] = dependent_field_ ? DependentBaseDownCast() : "";
   if (!HasFieldPresence(descriptor_->file())) {
     // If we don't have has-bits, message presence is indicated only by ptr !=
     // NULL. Thus on clear, we need to delete the object.
-    printer->Print(variables,
-      "if ($this_message$GetArenaNoVirtual() == NULL && "
-      "$this_message$$name$_ != NULL) delete $this_message$$name$_;\n"
-      "$this_message$$name$_ = NULL;\n");
+    printer->Print(variables_,
+      "if (GetArenaNoVirtual() == NULL && $name$_ != NULL) {\n"
+      "  delete $name$_;\n"
+      "}\n"
+      "$name$_ = NULL;\n");
   } else {
-    printer->Print(variables,
-      "if ($this_message$$name$_ != NULL) $this_message$$name$_->"
-      "$dependent_type$::Clear();\n");
+    printer->Print(variables_,
+      "if ($name$_ != NULL) $name$_->Clear();\n");
   }
 }
 
@@ -498,30 +379,36 @@ GenerateMessageClearingCode(io::Printer* printer) const {
   } else {
     printer->Print(variables_,
       "GOOGLE_DCHECK($name$_ != NULL);\n"
-      "$name$_->$type$::Clear();\n");
+      "$name$_->Clear();\n");
   }
 }
 
 void MessageFieldGenerator::
 GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "mutable_$name$()->$type$::MergeFrom(from.$name$());\n");
+  if (implicit_weak_field_) {
+    printer->Print(variables_,
+      "_internal_mutable_$name$()->CheckTypeAndMergeFrom(\n"
+      "    from._internal_$name$());\n");
+  } else {
+    printer->Print(variables_,
+      "mutable_$name$()->$type$::MergeFrom(from.$name$());\n");
+  }
 }
 
 void MessageFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "std::swap($name$_, other->$name$_);\n");
+  printer->Print(variables_, "swap($name$_, other->$name$_);\n");
 }
 
 void MessageFieldGenerator::
 GenerateDestructorCode(io::Printer* printer) const {
+  // TODO(gerbens) Remove this when we don't need to destruct default instances.
   // In google3 a default instance will never get deleted so we don't need to
   // worry about that but in opensource protobuf default instances are deleted
   // in shutdown process and we need to take special care when handling them.
   printer->Print(variables_,
-    "if (this != internal_default_instance()) {\n"
-    "  delete $name$_;\n"
-    "}\n");
+    "if (this != internal_default_instance()) ");
+  printer->Print(variables_, "delete $name$_;\n");
 }
 
 void MessageFieldGenerator::
@@ -531,25 +418,6 @@ GenerateConstructorCode(io::Printer* printer) const {
 
 void MessageFieldGenerator::
 GenerateCopyConstructorCode(io::Printer* printer) const {
-  // For non-Arena enabled messages, everything always goes on the heap.
-  //
-  // For Arena enabled messages, the logic is a bit more convoluted.
-  //
-  // In the copy constructor, we call InternalMetadataWithArena::MergeFrom,
-  // which does *not* copy the Arena pointer.  In the generated MergeFrom
-  // (see MessageFieldGenerator::GenerateMergingCode), we:
-  // -> copy the has bits (but this is done in bulk by a memcpy in the copy
-  //    constructor)
-  // -> check whether the destination field pointer is NULL (it will be, since
-  //    we're initializing it and would have called SharedCtor) and if so:
-  // -> call _slow_mutable_$name$(), which calls either
-  //    ::google::protobuf::Arena::CreateMessage<>(GetArenaNoVirtual()), or
-  //    ::google::protobuf::Arena::Create<>(GetArenaNoVirtual())
-  //
-  // At this point, GetArenaNoVirtual returns NULL since the Arena pointer
-  // wasn't copied, so both of these methods allocate the submessage on the
-  // heap.
-
   printer->Print(variables_,
     "if (from.has_$name$()) {\n"
     "  $name$_ = new $type$(*from.$name$_);\n"
@@ -560,13 +428,17 @@ GenerateCopyConstructorCode(io::Printer* printer) const {
 
 void MessageFieldGenerator::
 GenerateMergeFromCodedStream(io::Printer* printer) const {
-  if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE) {
+  if (implicit_weak_field_) {
     printer->Print(variables_,
-      "DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(\n"
+      "DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(\n"
+      "     input, _internal_mutable_$name$()));\n");
+  } else if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE) {
+    printer->Print(variables_,
+      "DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(\n"
       "     input, mutable_$name$()));\n");
   } else {
     printer->Print(variables_,
-      "DO_(::google::protobuf::internal::WireFormatLite::ReadGroupNoVirtual(\n"
+      "DO_(::google::protobuf::internal::WireFormatLite::ReadGroup(\n"
       "      $number$, input, mutable_$name$()));\n");
   }
 }
@@ -575,217 +447,121 @@ void MessageFieldGenerator::
 GenerateSerializeWithCachedSizes(io::Printer* printer) const {
   printer->Print(variables_,
     "::google::protobuf::internal::WireFormatLite::Write$stream_writer$(\n"
-    "  $number$, *$non_null_ptr_to_name$, output);\n");
+    "  $number$, this->_internal_$name$(), output);\n");
 }
 
 void MessageFieldGenerator::
 GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
   printer->Print(variables_,
     "target = ::google::protobuf::internal::WireFormatLite::\n"
-    "  InternalWrite$declared_type$NoVirtualToArray(\n"
-    "    $number$, *$non_null_ptr_to_name$, false, target);\n");
+    "  InternalWrite$declared_type$ToArray(\n"
+    "    $number$, this->_internal_$name$(), deterministic, target);\n");
 }
 
 void MessageFieldGenerator::
 GenerateByteSize(io::Printer* printer) const {
   printer->Print(variables_,
     "total_size += $tag_size$ +\n"
-    "  ::google::protobuf::internal::WireFormatLite::$declared_type$SizeNoVirtual(\n"
-    "    *$non_null_ptr_to_name$);\n");
+    "  ::google::protobuf::internal::WireFormatLite::$declared_type$Size(\n"
+    "    *$field_member$);\n");
 }
 
 // ===================================================================
 
-MessageOneofFieldGenerator::
-MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
-                           const Options& options)
-  : MessageFieldGenerator(descriptor, options),
-    dependent_base_(options.proto_h) {
+MessageOneofFieldGenerator::MessageOneofFieldGenerator(
+    const FieldDescriptor* descriptor, const Options& options,
+    SCCAnalyzer* scc_analyzer)
+    : MessageFieldGenerator(descriptor, options, scc_analyzer) {
   SetCommonOneofFieldVariables(descriptor, &variables_);
 }
 
 MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {}
 
-
-void MessageOneofFieldGenerator::
-GenerateDependentAccessorDeclarations(io::Printer* printer) const {
-  // Oneof field getters must be dependent as they call default_instance().
-  // Otherwise, the logic is the same as MessageFields.
-  if (!dependent_field_) {
-    return;
-  }
+void MessageOneofFieldGenerator::GenerateNonInlineAccessorDefinitions(
+    io::Printer* printer) const {
   printer->Print(variables_,
-      "$deprecated_attr$const $type$& $name$() const;\n");
-  MessageFieldGenerator::GenerateDependentAccessorDeclarations(printer);
-}
-
-void MessageOneofFieldGenerator::
-GenerateGetterDeclaration(io::Printer* printer) const {
-  // Oneof field getters must be dependent as they call default_instance().
-  // Unlike MessageField, this means there is no (non-dependent) getter to
-  // generate.
-  if (dependent_field_) {
-    return;
+    "void $classname$::set_allocated_$name$($type$* $name$) {\n"
+    "  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();\n"
+    "  clear_$oneof_name$();\n"
+    "  if ($name$) {\n");
+  if (SupportsArenas(descriptor_->message_type()) &&
+      descriptor_->file() != descriptor_->message_type()->file()) {
+    // We have to read the arena through the virtual method, because the type
+    // isn't defined in this file.
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena =\n"
+      "      reinterpret_cast<::google::protobuf::MessageLite*>($name$)->GetArena();\n");
+  } else if (!SupportsArenas(descriptor_->message_type())) {
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena = NULL;\n");
+  } else {
+    printer->Print(variables_,
+      "    ::google::protobuf::Arena* submessage_arena =\n"
+      "      ::google::protobuf::Arena::GetArena($name$);\n");
   }
   printer->Print(variables_,
-      "$deprecated_attr$const $type$& $name$() const;\n");
+    "    if (message_arena != submessage_arena) {\n"
+    "      $name$ = ::google::protobuf::internal::GetOwnedMessage(\n"
+    "          message_arena, $name$, submessage_arena);\n"
+    "    }\n"
+    "    set_has_$name$();\n"
+    "    $field_member$ = $name$;\n"
+    "  }\n"
+    "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
+    "}\n");
 }
 
 void MessageOneofFieldGenerator::
-GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const {
-  // For the CRTP base class, all mutation methods are dependent, and so
-  // they must be in the header.
-  if (!dependent_base_) {
-    return;
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  if (!implicit_weak_field_) {
+    printer->Print(variables_,
+      "inline const $type$& $classname$::_internal_$name$() const {\n"
+      "  return *$field_member$;\n"
+      "}\n");
   }
-  std::map<string, string> variables(variables_);
-  variables["inline"] = "inline ";
-  variables["dependent_classname"] =
-      DependentBaseClassTemplateName(descriptor_->containing_type()) + "<T>";
-  variables["this_message"] = "reinterpret_cast<T*>(this)->";
-  // Const message access is needed for the dependent getter.
-  variables["this_const_message"] = "reinterpret_cast<const T*>(this)->";
-  variables["tmpl"] = "template <class T>\n";
-  variables["field_member"] = variables["this_message"] +
-                              variables["oneof_prefix"] + variables["name"] +
-                              "_";
-  InternalGenerateInlineAccessorDefinitions(variables, printer);
-}
-
-void MessageOneofFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  if (dependent_base_) {
-    return;
+  printer->Print(variables_,
+    "inline $type$* $classname$::$release_name$() {\n"
+    "  // @@protoc_insertion_point(field_release:$full_name$)\n"
+    "  if (has_$name$()) {\n"
+    "    clear_has_$oneof_name$();\n"
+    "      $type$* temp = $field_member$;\n");
+  if (SupportsArenas(descriptor_)) {
+    printer->Print(variables_,
+      "    if (GetArenaNoVirtual() != NULL) {\n"
+      "      temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);\n"
+      "    }\n");
   }
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  variables["dependent_classname"] = variables["classname"];
-  variables["this_message"] = "";
-  variables["this_const_message"] = "";
-  variables["tmpl"] = "";
-  variables["field_member"] =
-      variables["oneof_prefix"] + variables["name"] + "_";
-  variables["dependent_type"] = variables["type"];
-  InternalGenerateInlineAccessorDefinitions(variables, printer);
-}
-
-void MessageOneofFieldGenerator::
-GenerateNonInlineAccessorDefinitions(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  variables["field_member"] =
-      variables["oneof_prefix"] + variables["name"] + "_";
-
-  //printer->Print(variables,
-}
+  printer->Print(variables_,
+    "    $field_member$ = NULL;\n"
+    "    return temp;\n"
+    "  } else {\n"
+    "    return NULL;\n"
+    "  }\n"
+    "}\n");
 
-void MessageOneofFieldGenerator::InternalGenerateInlineAccessorDefinitions(
-    const std::map<string, string>& variables, io::Printer* printer) const {
-  printer->Print(variables,
-    "$tmpl$"
-    "$inline$ "
-    "const $type$& $dependent_classname$::$name$() const {\n"
+  printer->Print(variables_,
+    "inline const $type$& $classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-    "  return $this_const_message$has_$name$()\n"
-    "      ? *$this_const_message$$oneof_prefix$$name$_\n"
-    "      : $dependent_type$::default_instance();\n"
+    "  return has_$name$()\n"
+    "      ? *$field_member$\n"
+    "      : *reinterpret_cast< $type$*>(&$type_default_instance$);\n"
     "}\n");
 
   if (SupportsArenas(descriptor_)) {
-    printer->Print(variables,
-      "$tmpl$"
-      "$inline$"
-      "$type$* $dependent_classname$::mutable_$name$() {\n"
-      "  if (!$this_message$has_$name$()) {\n"
-      "    $this_message$clear_$oneof_name$();\n"
-      "    $this_message$set_has_$name$();\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables,
-         "    $field_member$ = \n"
-         "      ::google::protobuf::Arena::CreateMessage< $dependent_typename$ >(\n"
-         "      $this_message$GetArenaNoVirtual());\n");
-    } else {
-      printer->Print(variables,
-         "    $this_message$$oneof_prefix$$name$_ = \n"
-         "      ::google::protobuf::Arena::Create< $dependent_typename$ >(\n"
-         "      $this_message$GetArenaNoVirtual());\n");
-    }
-    printer->Print(variables,
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $field_member$;\n"
-      "}\n"
-      "$tmpl$"
-      "$inline$"
-      "$type$* $dependent_classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
-      "  if ($this_message$has_$name$()) {\n"
-      "    $this_message$clear_has_$oneof_name$();\n"
-      "    if ($this_message$GetArenaNoVirtual() != NULL) {\n"
-      // N.B.: safe to use the underlying field pointer here because we are sure
-      // that it is non-NULL (because has_$name$() returned true).
-      "      $dependent_typename$* temp = "
-      "new $dependent_typename$(*$field_member$);\n"
-      "      $field_member$ = NULL;\n"
-      "      return temp;\n"
-      "    } else {\n"
-      "      $dependent_typename$* temp = $field_member$;\n"
-      "      $field_member$ = NULL;\n"
-      "      return temp;\n"
-      "    }\n"
-      "  } else {\n"
-      "    return NULL;\n"
-      "  }\n"
-      "}\n"
-      "$tmpl$"
-      "$inline$"
-      "void $dependent_classname$::"
-      "set_allocated_$name$($type$* $name$) {\n"
-      "  $this_message$clear_$oneof_name$();\n"
-      "  if ($name$) {\n");
-
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables,
-        // If incoming message is on the heap and we are on an arena, just Own()
-        // it (see above). If it's on a different arena than we are or one of us
-        // is on the heap, we make a copy to our arena/heap.
-        "    if ($this_message$GetArenaNoVirtual() != NULL &&\n"
-        "        ::google::protobuf::Arena::GetArena($name$) == NULL) {\n"
-        "      $this_message$GetArenaNoVirtual()->Own($name$);\n"
-        "    } else if ($this_message$GetArenaNoVirtual() !=\n"
-        "               ::google::protobuf::Arena::GetArena($name$)) {\n"
-        "      $dependent_typename$* new_$name$ = \n"
-        "          ::google::protobuf::Arena::CreateMessage< $dependent_typename$ >(\n"
-        "          $this_message$GetArenaNoVirtual());\n"
-        "      new_$name$->CopyFrom(*$name$);\n"
-        "      $name$ = new_$name$;\n"
-        "    }\n");
-    } else {
-      printer->Print(variables,
-        "    if ($this_message$GetArenaNoVirtual() != NULL) {\n"
-        "      $this_message$GetArenaNoVirtual()->Own($name$);\n"
-        "    }\n");
-    }
-
-    printer->Print(variables,
-      "    $this_message$set_has_$name$();\n"
-      "    $field_member$ = $name$;\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-      "}\n"
-      "$inline$ $type$* $classname$::unsafe_arena_release_$name$() {\n"
+    printer->Print(variables_,
+      "inline $type$* $classname$::unsafe_arena_release_$name$() {\n"
       "  // @@protoc_insertion_point(field_unsafe_arena_release"
       ":$full_name$)\n"
       "  if (has_$name$()) {\n"
       "    clear_has_$oneof_name$();\n"
-      "    $type$* temp = $oneof_prefix$$name$_;\n"
-      "    $oneof_prefix$$name$_ = NULL;\n"
+      "    $type$* temp = $field_member$;\n"
+      "    $field_member$ = NULL;\n"
       "    return temp;\n"
       "  } else {\n"
       "    return NULL;\n"
       "  }\n"
       "}\n"
-      "$inline$ void $classname$::unsafe_arena_set_allocated_$name$"
+      "inline void $classname$::unsafe_arena_set_allocated_$name$"
       "($type$* $name$) {\n"
       // We rely on the oneof clear method to free the earlier contents of this
       // oneof. We can directly use the pointer we're given to set the new
@@ -793,73 +569,36 @@ void MessageOneofFieldGenerator::InternalGenerateInlineAccessorDefinitions(
       "  clear_$oneof_name$();\n"
       "  if ($name$) {\n"
       "    set_has_$name$();\n"
-      "    $oneof_prefix$$name$_ = $name$;\n"
+      "    $field_member$ = $name$;\n"
       "  }\n"
       "  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:"
       "$full_name$)\n"
       "}\n");
-  } else {
-    printer->Print(variables,
-      "$tmpl$"
-      "$inline$"
-      "$type$* $dependent_classname$::mutable_$name$() {\n"
-      "  if (!$this_message$has_$name$()) {\n"
-      "    $this_message$clear_$oneof_name$();\n"
-      "    $this_message$set_has_$name$();\n"
-      "    $field_member$ = new $dependent_typename$;\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $field_member$;\n"
-      "}\n"
-      "$tmpl$"
-      "$inline$"
-      "$type$* $dependent_classname$::$release_name$() {\n"
-      "  // @@protoc_insertion_point(field_release:$full_name$)\n"
-      "  if ($this_message$has_$name$()) {\n"
-      "    $this_message$clear_has_$oneof_name$();\n"
-      "    $dependent_typename$* temp = $field_member$;\n"
-      "    $field_member$ = NULL;\n"
-      "    return temp;\n"
-      "  } else {\n"
-      "    return NULL;\n"
-      "  }\n"
-      "}\n"
-      "$tmpl$"
-      "$inline$"
-      "void $dependent_classname$::"
-      "set_allocated_$name$($type$* $name$) {\n"
-      "  $this_message$clear_$oneof_name$();\n"
-      "  if ($name$) {\n");
-    if (SupportsArenas(descriptor_->message_type())) {
-      printer->Print(variables,
-        "    if (static_cast< $dependent_typename$*>($name$)->"
-        "GetArena() != NULL) {\n"
-        "      $dependent_typename$* new_$name$ = new $dependent_typename$;\n"
-        "      new_$name$->CopyFrom(*$name$);\n"
-        "      $name$ = new_$name$;\n"
-        "    }\n");
-    }
-    printer->Print(variables,
-      "    $this_message$set_has_$name$();\n"
-      "    $field_member$ = $name$;\n"
-      "  }\n"
-      "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-      "}\n");
   }
+
+  printer->Print(variables_,
+    "inline $type$* $classname$::mutable_$name$() {\n"
+    "  if (!has_$name$()) {\n"
+    "    clear_$oneof_name$();\n"
+    "    set_has_$name$();\n"
+    "    $field_member$ = CreateMaybeMessage< $type$ >(\n"
+    "        GetArenaNoVirtual());\n"
+    "  }\n"
+    "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
+    "  return $field_member$;\n"
+    "}\n");
 }
 
 void MessageOneofFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  variables["this_message"] = dependent_field_ ? DependentBaseDownCast() : "";
   if (SupportsArenas(descriptor_)) {
-    printer->Print(variables,
-      "if ($this_message$GetArenaNoVirtual() == NULL) {\n"
-      "  delete $this_message$$oneof_prefix$$name$_;\n"
+    printer->Print(variables_,
+      "if (GetArenaNoVirtual() == NULL) {\n"
+      "  delete $field_member$;\n"
       "}\n");
   } else {
-    printer->Print(variables,
-      "delete $this_message$$oneof_prefix$$name$_;\n");
+    printer->Print(variables_,
+      "delete $field_member$;\n");
   }
 }
 
@@ -888,12 +627,13 @@ GenerateConstructorCode(io::Printer* printer) const {
 // ===================================================================
 
 RepeatedMessageFieldGenerator::RepeatedMessageFieldGenerator(
-    const FieldDescriptor* descriptor, const Options& options)
+    const FieldDescriptor* descriptor, const Options& options,
+    SCCAnalyzer* scc_analyzer)
     : FieldGenerator(options),
       descriptor_(descriptor),
-      dependent_field_(options.proto_h && IsFieldDependent(descriptor)),
-      dependent_getter_(dependent_field_ && options.safe_boundary_check) {
-  SetMessageVariables(descriptor, &variables_, options);
+      implicit_weak_field_(
+          IsImplicitWeakField(descriptor, options, scc_analyzer)) {
+  SetMessageVariables(descriptor, options, implicit_weak_field_, &variables_);
 }
 
 RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}
@@ -905,168 +645,103 @@ GeneratePrivateMembers(io::Printer* printer) const {
 }
 
 void RepeatedMessageFieldGenerator::
-InternalGenerateTypeDependentAccessorDeclarations(io::Printer* printer) const {
+GenerateAccessorDeclarations(io::Printer* printer) const {
   printer->Print(variables_,
-    "$deprecated_attr$$type$* mutable_$name$(int index);\n"
-    "$deprecated_attr$$type$* add_$name$();\n");
-  if (dependent_getter_) {
-    printer->Print(variables_,
-      "$deprecated_attr$const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
-      "    $name$() const;\n");
-  }
+                 "$deprecated_attr$$type$* ${$mutable_$name$$}$(int index);\n");
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$::google::protobuf::RepeatedPtrField< $type$ >*\n"
-    "    mutable_$name$();\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateDependentAccessorDeclarations(io::Printer* printer) const {
-  if (dependent_getter_) {
-    printer->Print(variables_,
-      "$deprecated_attr$const $type$& $name$(int index) const;\n");
-  }
-  if (dependent_field_) {
-    InternalGenerateTypeDependentAccessorDeclarations(printer);
-  }
-}
+                 "$deprecated_attr$::google::protobuf::RepeatedPtrField< $type$ >*\n"
+                 "    ${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
 
-void RepeatedMessageFieldGenerator::
-GenerateAccessorDeclarations(io::Printer* printer) const {
-  if (!dependent_getter_) {
-    printer->Print(variables_,
-      "$deprecated_attr$const $type$& $name$(int index) const;\n");
-  }
-  if (!dependent_field_) {
-    InternalGenerateTypeDependentAccessorDeclarations(printer);
-  }
-  if (!dependent_getter_) {
-    printer->Print(variables_,
-      "$deprecated_attr$const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
-      "    $name$() const;\n");
-  }
+  printer->Print(variables_,
+    "$deprecated_attr$const $type$& $name$(int index) const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_, "$deprecated_attr$$type$* ${$add_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+    "$deprecated_attr$const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
+    "    $name$() const;\n");
+  printer->Annotate("name", descriptor_);
 }
 
 void RepeatedMessageFieldGenerator::
-GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const {
-  if (!dependent_field_) {
-    return;
-  }
-  std::map<string, string> variables(variables_);
-  // For the CRTP base class, all mutation methods are dependent, and so
-  // they must be in the header.
-  variables["dependent_classname"] =
-      DependentBaseClassTemplateName(descriptor_->containing_type()) + "<T>";
-  variables["this_message"] = DependentBaseDownCast();
-  variables["this_const_message"] = DependentBaseConstDownCast();
-
-  if (dependent_getter_) {
-    printer->Print(variables,
-      "template <class T>\n"
-      "inline const $type$& $dependent_classname$::$name$(int index) const {\n"
-      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-      "  return $this_const_message$$name$_.$cppget$(index);\n"
-      "}\n");
-  }
-
-  // Generate per-element accessors:
-  printer->Print(variables,
-    "template <class T>\n"
-    "inline $type$* $dependent_classname$::mutable_$name$(int index) {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$* $classname$::mutable_$name$(int index) {\n"
     // TODO(dlj): move insertion points
     "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-    "  return $this_message$$name$_.Mutable(index);\n"
+    "$type_reference_function$"
+    "  return $name$_.Mutable(index);\n"
     "}\n"
-    "template <class T>\n"
-    "inline $type$* $dependent_classname$::add_$name$() {\n"
-    "  // @@protoc_insertion_point(field_add:$full_name$)\n"
-    "  return $this_message$$name$_.Add();\n"
-    "}\n");
-
-  if (dependent_getter_) {
-    printer->Print(variables,
-      "template <class T>\n"
-      "inline const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
-      "$dependent_classname$::$name$() const {\n"
-      "  // @@protoc_insertion_point(field_list:$full_name$)\n"
-      "  return $this_const_message$$name$_;\n"
-      "}\n");
-  }
-
-  // Generate mutable access to the entire list:
-  printer->Print(variables,
-    "template <class T>\n"
     "inline ::google::protobuf::RepeatedPtrField< $type$ >*\n"
-    "$dependent_classname$::mutable_$name$() {\n"
+    "$classname$::mutable_$name$() {\n"
     "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
-    "  return &$this_message$$name$_;\n"
+    "$type_reference_function$"
+    "  return &$name$_;\n"
     "}\n");
-}
 
-void RepeatedMessageFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-
-  if (!dependent_getter_) {
-    printer->Print(variables,
-      "$inline$"
-      "const $type$& $classname$::$name$(int index) const {\n"
+  if (options_.safe_boundary_check) {
+    printer->Print(variables_,
+      "inline const $type$& $classname$::$name$(int index) const {\n"
       "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-      "  return $name$_.$cppget$(index);\n"
+      "  return $name$_.InternalCheckedGet(index,\n"
+      "      *reinterpret_cast<const $type$*>(&$type_default_instance$));\n"
       "}\n");
-  }
-
-  if (!dependent_field_) {
-    printer->Print(variables,
-      "$inline$"
-      "$type$* $classname$::mutable_$name$(int index) {\n"
-      // TODO(dlj): move insertion points
-      "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-      "  return $name$_.Mutable(index);\n"
-      "}\n"
-      "$inline$"
-      "$type$* $classname$::add_$name$() {\n"
-      "  // @@protoc_insertion_point(field_add:$full_name$)\n"
-      "  return $name$_.Add();\n"
+  } else {
+    printer->Print(variables_,
+      "inline const $type$& $classname$::$name$(int index) const {\n"
+      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
+      "$type_reference_function$"
+      "  return $name$_.Get(index);\n"
       "}\n");
   }
 
-  if (!dependent_field_) {
-    printer->Print(variables,
-      "$inline$"
-      "::google::protobuf::RepeatedPtrField< $type$ >*\n"
-      "$classname$::mutable_$name$() {\n"
-      "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
-      "  return &$name$_;\n"
-      "}\n");
-  }
-  if (!dependent_getter_) {
-    printer->Print(variables,
-      "$inline$"
-      "const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
-      "$classname$::$name$() const {\n"
-      "  // @@protoc_insertion_point(field_list:$full_name$)\n"
-      "  return $name$_;\n"
-      "}\n");
-  }
+  printer->Print(variables_,
+    "inline $type$* $classname$::add_$name$() {\n"
+    "  // @@protoc_insertion_point(field_add:$full_name$)\n"
+    "  return $name$_.Add();\n"
+    "}\n");
+
+  printer->Print(variables_,
+    "inline const ::google::protobuf::RepeatedPtrField< $type$ >&\n"
+    "$classname$::$name$() const {\n"
+    "  // @@protoc_insertion_point(field_list:$full_name$)\n"
+    "$type_reference_function$"
+    "  return $name$_;\n"
+    "}\n");
 }
 
 void RepeatedMessageFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  variables["this_message"] = dependent_field_ ? DependentBaseDownCast() : "";
-  printer->Print(variables, "$this_message$$name$_.Clear();\n");
+  if (implicit_weak_field_) {
+    printer->Print(
+        variables_,
+        "CastToBase(&$name$_)->Clear<"
+        "::google::protobuf::internal::ImplicitWeakTypeHandler<$type$>>();\n");
+  } else {
+    printer->Print(variables_, "$name$_.Clear();\n");
+  }
 }
 
 void RepeatedMessageFieldGenerator::
 GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.MergeFrom(from.$name$_);\n");
+  if (implicit_weak_field_) {
+    printer->Print(
+        variables_,
+        "CastToBase(&$name$_)->MergeFrom<"
+        "::google::protobuf::internal::ImplicitWeakTypeHandler<$type$>>(CastToBase("
+        "from.$name$_));\n");
+  } else {
+    printer->Print(variables_, "$name$_.MergeFrom(from.$name$_);\n");
+  }
 }
 
 void RepeatedMessageFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.UnsafeArenaSwap(&other->$name$_);\n");
+  printer->Print(
+      variables_,
+      "CastToBase(&$name$_)->InternalSwap(CastToBase(&other->$name$_));\n");
 }
 
 void RepeatedMessageFieldGenerator::
@@ -1077,34 +752,55 @@ GenerateConstructorCode(io::Printer* printer) const {
 void RepeatedMessageFieldGenerator::
 GenerateMergeFromCodedStream(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_MESSAGE) {
-    printer->Print(variables_,
-      "DO_(::google::protobuf::internal::WireFormatLite::"
-      "ReadMessageNoVirtualNoRecursionDepth(\n"
-      "      input, add_$name$()));\n");
+    if (implicit_weak_field_) {
+      printer->Print(variables_,
+        "DO_(::google::protobuf::internal::WireFormatLite::"
+        "ReadMessage(input, CastToBase(&$name$_)->AddWeak(\n"
+        "    reinterpret_cast<const ::google::protobuf::MessageLite*>(\n"
+        "        &$type_default_instance$))));\n");
+    } else {
+      printer->Print(variables_,
+        "DO_(::google::protobuf::internal::WireFormatLite::"
+        "ReadMessage(\n"
+        "      input, add_$name$()));\n");
+    }
   } else {
     printer->Print(variables_,
       "DO_(::google::protobuf::internal::WireFormatLite::"
-      "ReadGroupNoVirtualNoRecursionDepth(\n"
-      "      $number$, input, add_$name$()));\n");
+      "ReadGroup($number$, input, add_$name$()));\n");
   }
 }
 
 void RepeatedMessageFieldGenerator::
 GenerateSerializeWithCachedSizes(io::Printer* printer) const {
   printer->Print(variables_,
-    "for (unsigned int i = 0, n = this->$name$_size(); i < n; i++) {\n"
+    "for (unsigned int i = 0,\n"
+    "    n = static_cast<unsigned int>(this->$name$_size()); i < n; i++) {\n"
     "  ::google::protobuf::internal::WireFormatLite::Write$stream_writer$(\n"
-    "    $number$, this->$name$(i), output);\n"
+    "    $number$,\n");
+  if (implicit_weak_field_) {
+    printer->Print(
+        variables_,
+        "    CastToBase($name$_).Get<"
+        "::google::protobuf::internal::ImplicitWeakTypeHandler<$type$>>("
+        "static_cast<int>(i)),\n");
+  } else {
+    printer->Print(variables_,
+      "    this->$name$(static_cast<int>(i)),\n");
+  }
+  printer->Print(variables_,
+    "    output);\n"
     "}\n");
 }
 
 void RepeatedMessageFieldGenerator::
 GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
   printer->Print(variables_,
-    "for (unsigned int i = 0, n = this->$name$_size(); i < n; i++) {\n"
+    "for (unsigned int i = 0,\n"
+    "    n = static_cast<unsigned int>(this->$name$_size()); i < n; i++) {\n"
     "  target = ::google::protobuf::internal::WireFormatLite::\n"
-    "    InternalWrite$declared_type$NoVirtualToArray(\n"
-    "      $number$, this->$name$(i), false, target);\n"
+    "    InternalWrite$declared_type$ToArray(\n"
+    "      $number$, this->$name$(static_cast<int>(i)), deterministic, target);\n"
     "}\n");
 }
 
@@ -1112,15 +808,24 @@ void RepeatedMessageFieldGenerator::
 GenerateByteSize(io::Printer* printer) const {
   printer->Print(variables_,
     "{\n"
-    "  unsigned int count = this->$name$_size();\n");
+    "  unsigned int count = static_cast<unsigned int>(this->$name$_size());\n");
   printer->Indent();
   printer->Print(variables_,
     "total_size += $tag_size$UL * count;\n"
     "for (unsigned int i = 0; i < count; i++) {\n"
     "  total_size +=\n"
-    "    ::google::protobuf::internal::WireFormatLite::$declared_type$SizeNoVirtual(\n"
-    "      this->$name$(i));\n"
-    "}\n");
+    "    ::google::protobuf::internal::WireFormatLite::$declared_type$Size(\n");
+  if (implicit_weak_field_) {
+    printer->Print(
+        variables_,
+        "      CastToBase($name$_).Get<"
+        "::google::protobuf::internal::ImplicitWeakTypeHandler<$type$>>("
+        "static_cast<int>(i)));\n");
+  } else {
+    printer->Print(variables_,
+        "      this->$name$(static_cast<int>(i)));\n");
+  }
+  printer->Print(variables_, "}\n");
   printer->Outdent();
   printer->Print("}\n");
 }
diff --git a/src/google/protobuf/compiler/cpp/cpp_message_field.h b/src/google/protobuf/compiler/cpp/cpp_message_field.h
index 9ca91153..6879539c 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_message_field.h
@@ -38,6 +38,7 @@
 #include <map>
 #include <string>
 #include <google/protobuf/compiler/cpp/cpp_field.h>
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
 
 namespace google {
 namespace protobuf {
@@ -47,16 +48,13 @@ namespace cpp {
 class MessageFieldGenerator : public FieldGenerator {
  public:
   MessageFieldGenerator(const FieldDescriptor* descriptor,
-                        const Options& options);
+                        const Options& options, SCCAnalyzer* scc_analyzer);
   ~MessageFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
-  void GenerateDependentAccessorDeclarations(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateNonInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMessageClearingCode(io::Printer* printer) const;
@@ -71,13 +69,8 @@ class MessageFieldGenerator : public FieldGenerator {
   void GenerateByteSize(io::Printer* printer) const;
 
  protected:
-  void GenerateArenaManipulationCode(const std::map<string, string>& variables,
-                                     io::Printer* printer) const;
-
-  virtual void GenerateGetterDeclaration(io::Printer* printer) const;
-
   const FieldDescriptor* descriptor_;
-  const bool dependent_field_;
+  const bool implicit_weak_field_;
   std::map<string, string> variables_;
 
  private:
@@ -87,14 +80,11 @@ class MessageFieldGenerator : public FieldGenerator {
 class MessageOneofFieldGenerator : public MessageFieldGenerator {
  public:
   MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
-                             const Options& options);
+                             const Options& options, SCCAnalyzer* scc_analyzer);
   ~MessageOneofFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
-  void GenerateDependentAccessorDeclarations(io::Printer* printer) const;
-  void GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateNonInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
 
@@ -105,30 +95,21 @@ class MessageOneofFieldGenerator : public MessageFieldGenerator {
   void GenerateDestructorCode(io::Printer* printer) const;
   void GenerateConstructorCode(io::Printer* printer) const;
 
- protected:
-  void GenerateGetterDeclaration(io::Printer* printer) const;
-
  private:
-  void InternalGenerateInlineAccessorDefinitions(
-      const std::map<string, string>& variables, io::Printer* printer) const;
-
-  const bool dependent_base_;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageOneofFieldGenerator);
 };
 
 class RepeatedMessageFieldGenerator : public FieldGenerator {
  public:
   RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor,
-                                const Options& options);
+                                const Options& options,
+                                SCCAnalyzer* scc_analyzer);
   ~RepeatedMessageFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
-  void GenerateDependentAccessorDeclarations(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateDependentInlineAccessorDefinitions(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
@@ -140,12 +121,8 @@ class RepeatedMessageFieldGenerator : public FieldGenerator {
   void GenerateByteSize(io::Printer* printer) const;
 
  private:
-  void InternalGenerateTypeDependentAccessorDeclarations(
-      io::Printer* printer) const;
-
   const FieldDescriptor* descriptor_;
-  const bool dependent_field_;
-  const bool dependent_getter_;
+  const bool implicit_weak_field_;
   std::map<string, string> variables_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedMessageFieldGenerator);
diff --git a/src/google/protobuf/compiler/javanano/javanano_extension.h b/src/google/protobuf/compiler/cpp/cpp_message_layout_helper.h
index 4843e296..d502a6f0 100644
--- a/src/google/protobuf/compiler/javanano/javanano_extension.h
+++ b/src/google/protobuf/compiler/cpp/cpp_message_layout_helper.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,47 +28,34 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: bduff@google.com (Brian Duff)
+// Author: seongkim@google.com (Seong Beom Kim)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/descriptor.pb.h>
+#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_LAYOUT_HELPER_H__
+#define GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_LAYOUT_HELPER_H__
 
+#include <google/protobuf/compiler/cpp/cpp_options.h>
+#include <google/protobuf/descriptor.h>
 
 namespace google {
 namespace protobuf {
-  namespace io {
-    class Printer;             // printer.h
-  }
-}
-
-namespace protobuf {
 namespace compiler {
-namespace javanano {
+namespace cpp {
 
-class ExtensionGenerator {
+// Provides an abstract interface to optimize message layout
+// by rearranging the fields of a message.
+class MessageLayoutHelper {
  public:
-  explicit ExtensionGenerator(const FieldDescriptor* descriptor, const Params& params);
-  ~ExtensionGenerator();
-
-  void Generate(io::Printer* printer) const;
+  virtual ~MessageLayoutHelper() {}
 
- private:
-  const Params& params_;
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ExtensionGenerator);
+  virtual void OptimizeLayout(std::vector<const FieldDescriptor*>* fields,
+                              const Options& options) = 0;
 };
 
-}  // namespace javanano
+}  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
-}  // namespace google
 
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_EXTENSION_H_
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_MESSAGE_LAYOUT_HELPER_H__
diff --git a/src/google/protobuf/compiler/cpp/cpp_move_unittest.cc b/src/google/protobuf/compiler/cpp/cpp_move_unittest.cc
new file mode 100644
index 00000000..eb7cd1c7
--- /dev/null
+++ b/src/google/protobuf/compiler/cpp/cpp_move_unittest.cc
@@ -0,0 +1,169 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/test_util.h>
+#include <google/protobuf/unittest.pb.h>
+#include <gtest/gtest.h>
+
+#if LANG_CXX11
+#include <type_traits>
+#endif
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+// Can't use an anonymous namespace here due to brokenness of Tru64 compiler.
+namespace cpp_unittest {
+
+// Moves are enabled only when compiling with a C++11 compiler or newer.
+#if LANG_CXX11
+
+TEST(MovableMessageTest, MoveConstructor) {
+  protobuf_unittest::TestAllTypes message1;
+  TestUtil::SetAllFields(&message1);
+  const auto* nested = &message1.optional_nested_message();
+
+  protobuf_unittest::TestAllTypes message2(std::move(message1));
+  TestUtil::ExpectAllFieldsSet(message2);
+
+  // Check if the optional_nested_message was actually moved (and not just
+  // copied).
+  EXPECT_EQ(nested, &message2.optional_nested_message());
+  EXPECT_NE(nested, &message1.optional_nested_message());
+}
+
+TEST(MovableMessageTest, MoveAssignmentOperator) {
+  protobuf_unittest::TestAllTypes message1;
+  TestUtil::SetAllFields(&message1);
+  const auto* nested = &message1.optional_nested_message();
+
+  protobuf_unittest::TestAllTypes message2;
+  message2 = std::move(message1);
+  TestUtil::ExpectAllFieldsSet(message2);
+
+  // Check if the optional_nested_message was actually moved (and not just
+  // copied).
+  EXPECT_EQ(nested, &message2.optional_nested_message());
+  EXPECT_NE(nested, &message1.optional_nested_message());
+}
+
+TEST(MovableMessageTest, SelfMoveAssignment) {
+  // The `self` reference is necessary to defeat -Wself-move.
+  protobuf_unittest::TestAllTypes message, &self = message;
+  TestUtil::SetAllFields(&message);
+  message = std::move(self);
+  TestUtil::ExpectAllFieldsSet(message);
+}
+
+TEST(MovableMessageTest, MoveSameArena) {
+  Arena arena;
+
+  auto* message1_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
+  TestUtil::SetAllFields(message1_on_arena);
+  const auto* nested = &message1_on_arena->optional_nested_message();
+
+  auto* message2_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
+
+  // Moving messages on the same arena should lead to swapped pointers.
+  *message2_on_arena = std::move(*message1_on_arena);
+  EXPECT_EQ(nested, &message2_on_arena->optional_nested_message());
+}
+
+TEST(MovableMessageTest, MoveDifferentArenas) {
+  Arena arena1, arena2;
+
+  auto* message1_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena1);
+  TestUtil::SetAllFields(message1_on_arena);
+  const auto* nested = &message1_on_arena->optional_nested_message();
+
+  auto* message2_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena2);
+
+  // Moving messages on two different arenas should lead to a copy.
+  *message2_on_arena = std::move(*message1_on_arena);
+  EXPECT_NE(nested, &message2_on_arena->optional_nested_message());
+  TestUtil::ExpectAllFieldsSet(*message1_on_arena);
+  TestUtil::ExpectAllFieldsSet(*message2_on_arena);
+}
+
+TEST(MovableMessageTest, MoveFromArena) {
+  Arena arena;
+
+  auto* message1_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
+  TestUtil::SetAllFields(message1_on_arena);
+  const auto* nested = &message1_on_arena->optional_nested_message();
+
+  protobuf_unittest::TestAllTypes message2;
+
+  // Moving from a message on the arena should lead to a copy.
+  message2 = std::move(*message1_on_arena);
+  EXPECT_NE(nested, &message2.optional_nested_message());
+  TestUtil::ExpectAllFieldsSet(*message1_on_arena);
+  TestUtil::ExpectAllFieldsSet(message2);
+}
+
+TEST(MovableMessageTest, MoveToArena) {
+  Arena arena;
+
+  protobuf_unittest::TestAllTypes message1;
+  TestUtil::SetAllFields(&message1);
+  const auto* nested = &message1.optional_nested_message();
+
+  auto* message2_on_arena =
+      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
+
+  // Moving to a message on the arena should lead to a copy.
+  *message2_on_arena = std::move(message1);
+  EXPECT_NE(nested, &message2_on_arena->optional_nested_message());
+  TestUtil::ExpectAllFieldsSet(message1);
+  TestUtil::ExpectAllFieldsSet(*message2_on_arena);
+}
+
+TEST(MovableMessageTest, Noexcept) {
+  EXPECT_TRUE(
+      std::is_nothrow_move_constructible<protobuf_unittest::TestAllTypes>());
+  EXPECT_TRUE(std::is_nothrow_move_assignable<protobuf_unittest::TestAllTypes>());
+}
+
+#endif  // LANG_CXX11
+
+}  // namespace cpp_unittest
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/compiler/cpp/cpp_options.h b/src/google/protobuf/compiler/cpp/cpp_options.h
index ee44fb0a..f09885be 100644
--- a/src/google/protobuf/compiler/cpp/cpp_options.h
+++ b/src/google/protobuf/compiler/cpp/cpp_options.h
@@ -39,6 +39,8 @@
 namespace google {
 namespace protobuf {
 namespace compiler {
+class AccessInfoMap;
+
 namespace cpp {
 
 // Generator options (see generator.cc for a description of each):
@@ -46,18 +48,30 @@ struct Options {
   Options()
       : safe_boundary_check(false),
         proto_h(false),
-        allow_import_public(true),
+        transitive_pb_h(true),
         annotate_headers(false),
-        enforce_lite(false) {}
+        enforce_lite(false),
+        table_driven_parsing(false),
+        table_driven_serialization(false),
+        lite_implicit_weak_fields(false),
+        bootstrap(false),
+        num_cc_files(0),
+        access_info_map(NULL) {}
 
   string dllexport_decl;
   bool safe_boundary_check;
   bool proto_h;
-  bool allow_import_public;
+  bool transitive_pb_h;
   bool annotate_headers;
   bool enforce_lite;
+  bool table_driven_parsing;
+  bool table_driven_serialization;
+  bool lite_implicit_weak_fields;
+  bool bootstrap;
+  int num_cc_files;
   string annotation_pragma_name;
   string annotation_guard_name;
+  const AccessInfoMap* access_info_map;
 };
 
 }  // namespace cpp
diff --git a/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.cc b/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.cc
new file mode 100644
index 00000000..e9303865
--- /dev/null
+++ b/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.cc
@@ -0,0 +1,220 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/compiler/cpp/cpp_padding_optimizer.h>
+
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+namespace {
+
+// FieldGroup is just a helper for PaddingOptimizer below. It holds a vector of
+// fields that are grouped together because they have compatible alignment, and
+// a preferred location in the final field ordering.
+class FieldGroup {
+ public:
+  FieldGroup() : preferred_location_(0) {}
+
+  // A group with a single field.
+  FieldGroup(float preferred_location, const FieldDescriptor* field)
+      : preferred_location_(preferred_location), fields_(1, field) {}
+
+  // Append the fields in 'other' to this group.
+  void Append(const FieldGroup& other) {
+    if (other.fields_.empty()) {
+      return;
+    }
+    // Preferred location is the average among all the fields, so we weight by
+    // the number of fields on each FieldGroup object.
+    preferred_location_ = (preferred_location_ * fields_.size() +
+                           (other.preferred_location_ * other.fields_.size())) /
+                          (fields_.size() + other.fields_.size());
+    fields_.insert(fields_.end(), other.fields_.begin(), other.fields_.end());
+  }
+
+  void SetPreferredLocation(float location) { preferred_location_ = location; }
+  const std::vector<const FieldDescriptor*>& fields() const { return fields_; }
+
+  // FieldGroup objects sort by their preferred location.
+  bool operator<(const FieldGroup& other) const {
+    return preferred_location_ < other.preferred_location_;
+  }
+
+ private:
+  // "preferred_location_" is an estimate of where this group should go in the
+  // final list of fields.  We compute this by taking the average index of each
+  // field in this group in the original ordering of fields.  This is very
+  // approximate, but should put this group close to where its member fields
+  // originally went.
+  float preferred_location_;
+  std::vector<const FieldDescriptor*> fields_;
+  // We rely on the default copy constructor and operator= so this type can be
+  // used in a vector.
+};
+
+}  // namespace
+
+// Reorder 'fields' so that if the fields are output into a c++ class in the new
+// order, fields of similar family (see below) are together and within each
+// family, alignment padding is minimized.
+//
+// We try to do this while keeping each field as close as possible to its field
+// number order so that we don't reduce cache locality much for function that
+// access each field in order.  Originally, OptimizePadding used declaration
+// order for its decisions, but generated code minus the serializer/parsers uses
+// the output of OptimizePadding as well (stored in
+// MessageGenerator::optimized_order_).  Since the serializers use field number
+// order, we use that as a tie-breaker.
+//
+// We classify each field into a particular "family" of fields, that we perform
+// the same operation on in our generated functions.
+//
+// REPEATED is placed first, as the C++ compiler automatically initializes
+// these fields in layout order.
+//
+// STRING is grouped next, as our Clear/SharedCtor/SharedDtor walks it and
+// calls ArenaStringPtr::Destroy on each.
+//
+//
+// MESSAGE is grouped next, as our Clear/SharedDtor code walks it and calls
+// delete on each.  We initialize these fields with a NULL pointer (see
+// MessageFieldGenerator::GenerateConstructorCode), which allows them to be
+// memset.
+//
+// ZERO_INITIALIZABLE is memset in Clear/SharedCtor
+//
+// OTHER these fields are initialized one-by-one.
+void PaddingOptimizer::OptimizeLayout(
+    std::vector<const FieldDescriptor*>* fields, const Options& options) {
+  // The sorted numeric order of Family determines the declaration order in the
+  // memory layout.
+  enum Family {
+    REPEATED = 0,
+    STRING = 1,
+    MESSAGE = 3,
+    ZERO_INITIALIZABLE = 4,
+    OTHER = 5,
+    kMaxFamily
+  };
+
+  // First divide fields into those that align to 1 byte, 4 bytes or 8 bytes.
+  std::vector<FieldGroup> aligned_to_1[kMaxFamily];
+  std::vector<FieldGroup> aligned_to_4[kMaxFamily];
+  std::vector<FieldGroup> aligned_to_8[kMaxFamily];
+  for (int i = 0; i < fields->size(); ++i) {
+    const FieldDescriptor* field = (*fields)[i];
+
+    Family f = OTHER;
+    if (field->is_repeated()) {
+      f = REPEATED;
+    } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
+      f = STRING;
+    } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+      f = MESSAGE;
+
+    } else if (CanInitializeByZeroing(field)) {
+      f = ZERO_INITIALIZABLE;
+    }
+
+    const int j = field->number();
+    switch (EstimateAlignmentSize(field)) {
+      case 1:
+        aligned_to_1[f].push_back(FieldGroup(j, field));
+        break;
+      case 4:
+        aligned_to_4[f].push_back(FieldGroup(j, field));
+        break;
+      case 8:
+        aligned_to_8[f].push_back(FieldGroup(j, field));
+        break;
+      default:
+        GOOGLE_LOG(FATAL) << "Unknown alignment size " << EstimateAlignmentSize(field)
+                   << "for a field " << field->full_name() << ".";
+    }
+  }
+
+  // For each family, group fields to optimize padding.
+  for (int f = 0; f < kMaxFamily; f++) {
+    // Now group fields aligned to 1 byte into sets of 4, and treat those like a
+    // single field aligned to 4 bytes.
+    for (int i = 0; i < aligned_to_1[f].size(); i += 4) {
+      FieldGroup field_group;
+      for (int j = i; j < aligned_to_1[f].size() && j < i + 4; ++j) {
+        field_group.Append(aligned_to_1[f][j]);
+      }
+      aligned_to_4[f].push_back(field_group);
+    }
+    // Sort by preferred location to keep fields as close to their field number
+    // order as possible.  Using stable_sort ensures that the output is
+    // consistent across runs.
+    std::stable_sort(aligned_to_4[f].begin(), aligned_to_4[f].end());
+
+    // Now group fields aligned to 4 bytes (or the 4-field groups created above)
+    // into pairs, and treat those like a single field aligned to 8 bytes.
+    for (int i = 0; i < aligned_to_4[f].size(); i += 2) {
+      FieldGroup field_group;
+      for (int j = i; j < aligned_to_4[f].size() && j < i + 2; ++j) {
+        field_group.Append(aligned_to_4[f][j]);
+      }
+      if (i == aligned_to_4[f].size() - 1) {
+        if (f == OTHER) {
+          // Move incomplete 4-byte block to the beginning.  This is done to
+          // pair with the (possible) leftover blocks from the
+          // ZERO_INITIALIZABLE family.
+          field_group.SetPreferredLocation(-1);
+        } else {
+          // Move incomplete 4-byte block to the end.
+          field_group.SetPreferredLocation(fields->size() + 1);
+        }
+      }
+      aligned_to_8[f].push_back(field_group);
+    }
+    // Sort by preferred location.
+    std::stable_sort(aligned_to_8[f].begin(), aligned_to_8[f].end());
+  }
+
+  // Now pull out all the FieldDescriptors in order.
+  fields->clear();
+  for (int f = 0; f < kMaxFamily; ++f) {
+    for (int i = 0; i < aligned_to_8[f].size(); ++i) {
+      fields->insert(fields->end(), aligned_to_8[f][i].fields().begin(),
+                     aligned_to_8[f][i].fields().end());
+    }
+  }
+}
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_generator.h b/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.h
index 6f9f7f2a..42a3b5cd 100644
--- a/src/google/protobuf/compiler/javanano/javanano_generator.h
+++ b/src/google/protobuf/compiler/cpp/cpp_padding_optimizer.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,45 +28,37 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
+// Author: seongkim@google.com (Seong Beom Kim)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
-//
-// Generates Java nano code for a given .proto file.
 
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__
+#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_PADDING_OPTIMIZER_H__
+#define GOOGLE_PROTOBUF_COMPILER_CPP_PADDING_OPTIMIZER_H__
 
-#include <string>
-#include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/compiler/cpp/cpp_message_layout_helper.h>
 
 namespace google {
 namespace protobuf {
 namespace compiler {
-namespace javanano {
+namespace cpp {
 
-// CodeGenerator implementation which generates Java nano code.  If you create your
-// own protocol compiler binary and you want it to support Java output for the
-// nano runtime, you can do so by registering an instance of this CodeGenerator with
-// the CommandLineInterface in your main() function.
-class LIBPROTOC_EXPORT JavaNanoGenerator : public CodeGenerator {
+// Rearranges the fields of a message to minimize padding.
+// Fields are grouped by the type and the size.
+// For example, grouping four boolean fields and one int32
+// field results in zero padding overhead. See OptimizeLayout's
+// comment for details.
+class PaddingOptimizer : public MessageLayoutHelper {
  public:
-  JavaNanoGenerator();
-  ~JavaNanoGenerator();
-
-  // implements CodeGenerator ----------------------------------------
-  bool Generate(const FileDescriptor* file,
-                const string& parameter,
-                GeneratorContext* output_directory,
-                string* error) const;
+  PaddingOptimizer() {}
+  ~PaddingOptimizer() override {}
 
- private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(JavaNanoGenerator);
+  void OptimizeLayout(std::vector<const FieldDescriptor*>* fields,
+                      const Options& options) override;
 };
 
-}  // namespace javanano
+}  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
 
 }  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_NANO_GENERATOR_H__
+#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_PADDING_OPTIMIZER_H__
diff --git a/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc b/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc
index 34a41d82..ff6ba0f8 100644
--- a/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_plugin_unittest.cc
@@ -35,9 +35,6 @@
 //   worth.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/cpp/cpp_generator.h>
 #include <google/protobuf/compiler/command_line_interface.h>
@@ -132,7 +129,7 @@ class TestGenerator : public CodeGenerator {
     // Check field accessors for a message inside oneof{}:
     TryInsert("test.pb.h", "field_get:foo.Bar.oneOfMessage", context);
     TryInsert("test.pb.h", "field_mutable:foo.Bar.oneOfMessage", context);
-    TryInsert("test.pb.h", "field_set_allocated:foo.Bar.oneOfMessage", context);
+    TryInsert("test.pb.cc", "field_set_allocated:foo.Bar.oneOfMessage", context);
 
     // Check field accessors for an optional enum:
     TryInsert("test.pb.h", "field_get:foo.Bar.optEnum", context);
@@ -172,7 +169,7 @@ class TestGenerator : public CodeGenerator {
 
   void TryInsert(const string& filename, const string& insertion_point,
                  GeneratorContext* context) const {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         context->OpenForInsert(filename, insertion_point));
     io::Printer printer(output.get(), '$');
     printer.Print("// inserted $name$\n", "name", insertion_point);
diff --git a/src/google/protobuf/compiler/cpp/cpp_primitive_field.cc b/src/google/protobuf/compiler/cpp/cpp_primitive_field.cc
index 4a0a23f6..701f9d2d 100644
--- a/src/google/protobuf/compiler/cpp/cpp_primitive_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_primitive_field.cc
@@ -115,21 +115,21 @@ GeneratePrivateMembers(io::Printer* printer) const {
 
 void PrimitiveFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
+  printer->Print(variables_, "$deprecated_attr$$type$ $name$() const;\n");
+  printer->Annotate("name", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$$type$ $name$() const;\n"
-    "$deprecated_attr$void set_$name$($type$ value);\n");
+                 "$deprecated_attr$void ${$set_$name$$}$($type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void PrimitiveFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer, bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$() const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  return $name$_;\n"
     "}\n"
-    "$inline$void $classname$::set_$name$($type$ value) {\n"
+    "inline void $classname$::set_$name$($type$ value) {\n"
     "  $set_hasbit$\n"
     "  $name$_ = value;\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
@@ -148,7 +148,7 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void PrimitiveFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "std::swap($name$_, other->$name$_);\n");
+  printer->Print(variables_, "swap($name$_, other->$name$_);\n");
 }
 
 void PrimitiveFieldGenerator::
@@ -210,30 +210,28 @@ PrimitiveOneofFieldGenerator(const FieldDescriptor* descriptor,
 PrimitiveOneofFieldGenerator::~PrimitiveOneofFieldGenerator() {}
 
 void PrimitiveOneofFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer, bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$() const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  if (has_$name$()) {\n"
-    "    return $oneof_prefix$$name$_;\n"
+    "    return $field_member$;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n"
-    "$inline$void $classname$::set_$name$($type$ value) {\n"
+    "inline void $classname$::set_$name$($type$ value) {\n"
     "  if (!has_$name$()) {\n"
     "    clear_$oneof_name$();\n"
     "    set_has_$name$();\n"
     "  }\n"
-    "  $oneof_prefix$$name$_ = value;\n"
+    "  $field_member$ = value;\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "}\n");
 }
 
 void PrimitiveOneofFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$oneof_prefix$$name$_ = $default$;\n");
+  printer->Print(variables_, "$field_member$ = $default$;\n");
 }
 
 void PrimitiveOneofFieldGenerator::
@@ -243,9 +241,8 @@ GenerateSwappingCode(io::Printer* printer) const {
 
 void PrimitiveOneofFieldGenerator::
 GenerateConstructorCode(io::Printer* printer) const {
-  printer->Print(
-      variables_,
-      "_$classname$_default_instance_.$name$_ = $default$;\n");
+  printer->Print(variables_,
+                 "$ns$::_$classname$_default_instance_.$name$_ = $default$;\n");
 }
 
 void PrimitiveOneofFieldGenerator::
@@ -254,7 +251,7 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     "clear_$oneof_name$();\n"
     "DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<\n"
     "         $type$, $wire_format_field_type$>(\n"
-    "       input, &$oneof_prefix$$name$_)));\n"
+    "       input, &$field_member$)));\n"
     "set_has_$name$();\n");
 }
 
@@ -290,40 +287,46 @@ GeneratePrivateMembers(io::Printer* printer) const {
 void RepeatedPrimitiveFieldGenerator::
 GenerateAccessorDeclarations(io::Printer* printer) const {
   printer->Print(variables_,
-    "$deprecated_attr$$type$ $name$(int index) const;\n"
-    "$deprecated_attr$void set_$name$(int index, $type$ value);\n"
-    "$deprecated_attr$void add_$name$($type$ value);\n");
+                 "$deprecated_attr$$type$ $name$(int index) const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$set_$name$$}$(int index, $type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$add_$name$$}$($type$ value);\n");
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$const ::google::protobuf::RepeatedField< $type$ >&\n"
-    "    $name$() const;\n"
-    "$deprecated_attr$::google::protobuf::RepeatedField< $type$ >*\n"
-    "    mutable_$name$();\n");
+                 "$deprecated_attr$const ::google::protobuf::RepeatedField< $type$ >&\n"
+                 "    $name$() const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$::google::protobuf::RepeatedField< $type$ >*\n"
+                 "    ${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedPrimitiveFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer, bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$$type$ $classname$::$name$(int index) const {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  printer->Print(variables_,
+    "inline $type$ $classname$::$name$(int index) const {\n"
     "  // @@protoc_insertion_point(field_get:$full_name$)\n"
     "  return $name$_.Get(index);\n"
     "}\n"
-    "$inline$void $classname$::set_$name$(int index, $type$ value) {\n"
+    "inline void $classname$::set_$name$(int index, $type$ value) {\n"
     "  $name$_.Set(index, value);\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "}\n"
-    "$inline$void $classname$::add_$name$($type$ value) {\n"
+    "inline void $classname$::add_$name$($type$ value) {\n"
     "  $name$_.Add(value);\n"
     "  // @@protoc_insertion_point(field_add:$full_name$)\n"
-    "}\n");
-  printer->Print(variables,
-    "$inline$const ::google::protobuf::RepeatedField< $type$ >&\n"
+    "}\n"
+    "inline const ::google::protobuf::RepeatedField< $type$ >&\n"
     "$classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_list:$full_name$)\n"
     "  return $name$_;\n"
     "}\n"
-    "$inline$::google::protobuf::RepeatedField< $type$ >*\n"
+    "inline ::google::protobuf::RepeatedField< $type$ >*\n"
     "$classname$::mutable_$name$() {\n"
     "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
     "  return &$name$_;\n"
@@ -342,7 +345,7 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void RepeatedPrimitiveFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.UnsafeArenaSwap(&other->$name$_);\n");
+  printer->Print(variables_, "$name$_.InternalSwap(&other->$name$_);\n");
 }
 
 void RepeatedPrimitiveFieldGenerator::
@@ -382,9 +385,13 @@ GenerateSerializeWithCachedSizes(io::Printer* printer) const {
           "$number$, "
           "::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED, "
           "output);\n"
-      "  output->WriteVarint32(_$name$_cached_byte_size_);\n");
+      "  output->WriteVarint32(static_cast< ::google::protobuf::uint32>(\n"
+      "      _$name$_cached_byte_size_));\n");
 
     if (FixedSize(descriptor_->type()) > 0) {
+      // TODO(ckennelly): Use RepeatedField<T>::unsafe_data() via
+      // WireFormatLite to access the contents of this->$name$_ to save a branch
+      // here.
       printer->Print(variables_,
         "  ::google::protobuf::internal::WireFormatLite::Write$declared_type$Array(\n"
         "    this->$name$().data(), this->$name$_size(), output);\n");
@@ -419,21 +426,16 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
       "    ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,\n"
       "    target);\n"
       "  target = ::google::protobuf::io::CodedOutputStream::WriteVarint32ToArray(\n"
-      "    _$name$_cached_byte_size_, target);\n"
-      "}\n");
-  }
-  printer->Print(variables_,
-      "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
-  if (descriptor_->is_packed()) {
-    printer->Print(variables_,
+      "      static_cast< ::google::protobuf::int32>(\n"
+      "          _$name$_cached_byte_size_), target);\n"
       "  target = ::google::protobuf::internal::WireFormatLite::\n"
-      "    Write$declared_type$NoTagToArray(this->$name$(i), target);\n");
+      "    Write$declared_type$NoTagToArray(this->$name$_, target);\n"
+      "}\n");
   } else {
     printer->Print(variables_,
-      "  target = ::google::protobuf::internal::WireFormatLite::\n"
-      "    Write$declared_type$ToArray($number$, this->$name$(i), target);\n");
+      "target = ::google::protobuf::internal::WireFormatLite::\n"
+      "  Write$declared_type$ToArray($number$, this->$name$_, target);\n");
   }
-  printer->Print("}\n");
 }
 
 void RepeatedPrimitiveFieldGenerator::
@@ -447,7 +449,7 @@ GenerateByteSize(io::Printer* printer) const {
       "  $declared_type$Size(this->$name$_);\n");
   } else {
     printer->Print(variables_,
-      "unsigned int count = this->$name$_size();\n"
+      "unsigned int count = static_cast<unsigned int>(this->$name$_size());\n"
       "size_t data_size = $fixed_size$UL * count;\n");
   }
 
@@ -455,7 +457,8 @@ GenerateByteSize(io::Printer* printer) const {
     printer->Print(variables_,
       "if (data_size > 0) {\n"
       "  total_size += $tag_size$ +\n"
-      "    ::google::protobuf::internal::WireFormatLite::Int32Size(data_size);\n"
+      "    ::google::protobuf::internal::WireFormatLite::Int32Size(\n"
+      "        static_cast< ::google::protobuf::int32>(data_size));\n"
       "}\n"
       "int cached_size = ::google::protobuf::internal::ToCachedSize(data_size);\n"
       "GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();\n"
diff --git a/src/google/protobuf/compiler/cpp/cpp_primitive_field.h b/src/google/protobuf/compiler/cpp/cpp_primitive_field.h
index 44c9ff3e..d52228e9 100644
--- a/src/google/protobuf/compiler/cpp/cpp_primitive_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_primitive_field.h
@@ -53,8 +53,7 @@ class PrimitiveFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
@@ -80,8 +79,7 @@ class PrimitiveOneofFieldGenerator : public PrimitiveFieldGenerator {
   ~PrimitiveOneofFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
   void GenerateConstructorCode(io::Printer* printer) const;
@@ -100,8 +98,7 @@ class RepeatedPrimitiveFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
diff --git a/src/google/protobuf/compiler/cpp/cpp_string_field.cc b/src/google/protobuf/compiler/cpp/cpp_string_field.cc
index 664a2779..cf6c4b33 100644
--- a/src/google/protobuf/compiler/cpp/cpp_string_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_string_field.cc
@@ -34,8 +34,9 @@
 
 #include <google/protobuf/compiler/cpp/cpp_string_field.h>
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -52,15 +53,16 @@ void SetStringVariables(const FieldDescriptor* descriptor,
   (*variables)["default"] = DefaultValue(descriptor);
   (*variables)["default_length"] =
       SimpleItoa(descriptor->default_value_string().length());
-  string default_variable_string = "_default_" + FieldName(descriptor) + "_";
+  string default_variable_string = MakeDefaultName(descriptor);
   (*variables)["default_variable_name"] = default_variable_string;
   (*variables)["default_variable"] =
       descriptor->default_value_string().empty()
           ? "&::google::protobuf::internal::GetEmptyStringAlreadyInited()"
-          : "&" + (*variables)["classname"] + "::" + default_variable_string +
-                ".get()";
+          : "&" + Namespace(descriptor) + "::" + (*variables)["classname"] +
+                "::" + default_variable_string + ".get()";
   (*variables)["pointer_type"] =
       descriptor->type() == FieldDescriptor::TYPE_BYTES ? "void" : "char";
+  (*variables)["null_check"] = "GOOGLE_DCHECK(value != NULL);\n";
   // NOTE: Escaped here to unblock proto1->proto2 migration.
   // TODO(liujisi): Extend this to apply for other conflicting methods.
   (*variables)["release_name"] =
@@ -69,6 +71,9 @@ void SetStringVariables(const FieldDescriptor* descriptor,
   (*variables)["full_name"] = descriptor->full_name();
 
   (*variables)["string_piece"] = "::std::string";
+
+  (*variables)["lite"] =
+      HasDescriptorMethods(descriptor->file(), options) ? "" : "Lite";
 }
 
 }  // namespace
@@ -77,7 +82,24 @@ void SetStringVariables(const FieldDescriptor* descriptor,
 
 StringFieldGenerator::StringFieldGenerator(const FieldDescriptor* descriptor,
                                            const Options& options)
-    : FieldGenerator(options), descriptor_(descriptor) {
+    : FieldGenerator(options),
+      descriptor_(descriptor),
+      lite_(!HasDescriptorMethods(descriptor->file(), options)),
+      inlined_(false) {
+
+  // TODO(ckennelly): Handle inlining for any.proto.
+  if (IsAnyMessage(descriptor_->containing_type())) {
+    inlined_ = false;
+  }
+  if (descriptor_->containing_type()->options().map_entry()) {
+    inlined_ = false;
+  }
+
+  // Limit to proto2, as we rely on has bits to distinguish field presence for
+  // release_$name$.  On proto3, we cannot use the address of the string
+  // instance when the field has been inlined.
+  inlined_ = inlined_ && HasFieldPresence(descriptor_->file());
+
   SetStringVariables(descriptor, &variables_, options);
 }
 
@@ -85,27 +107,36 @@ StringFieldGenerator::~StringFieldGenerator() {}
 
 void StringFieldGenerator::
 GeneratePrivateMembers(io::Printer* printer) const {
-  // N.B. that we continue to use |ArenaStringPtr| instead of |string*| for
-  // string fields, even when SupportArenas(descriptor_) == false. Why?
-  // The simple answer is to avoid unmaintainable complexity. The reflection
-  // code assumes ArenaStringPtrs. These are *almost* in-memory-compatible with
-  // string*, except for the pointer tags and related ownership semantics. We
-  // could modify the runtime code to use string* for the not-supporting-arenas
-  // case, but this would require a way to detect which type of class was
-  // generated (adding overhead and complexity to GeneratedMessageReflection)
-  // and littering the runtime code paths with conditionals. It's simpler to
-  // stick with this but use lightweight accessors that assume arena == NULL.
-  // There should be very little overhead anyway because it's just a tagged
-  // pointer in-memory.
-  printer->Print(variables_, "::google::protobuf::internal::ArenaStringPtr $name$_;\n");
+  if (inlined_) {
+    printer->Print(variables_,
+                   "::google::protobuf::internal::InlinedStringField $name$_;\n");
+  } else {
+    // N.B. that we continue to use |ArenaStringPtr| instead of |string*| for
+    // string fields, even when SupportArenas(descriptor_) == false. Why?  The
+    // simple answer is to avoid unmaintainable complexity. The reflection code
+    // assumes ArenaStringPtrs. These are *almost* in-memory-compatible with
+    // string*, except for the pointer tags and related ownership semantics. We
+    // could modify the runtime code to use string* for the
+    // not-supporting-arenas case, but this would require a way to detect which
+    // type of class was generated (adding overhead and complexity to
+    // GeneratedMessageReflection) and littering the runtime code paths with
+    // conditionals. It's simpler to stick with this but use lightweight
+    // accessors that assume arena == NULL.  There should be very little
+    // overhead anyway because it's just a tagged pointer in-memory.
+    printer->Print(variables_, "::google::protobuf::internal::ArenaStringPtr $name$_;\n");
+  }
 }
 
 void StringFieldGenerator::
 GenerateStaticMembers(io::Printer* printer) const {
   if (!descriptor_->default_value_string().empty()) {
+    // We make the default instance public, so it can be initialized by
+    // non-friend code.
     printer->Print(variables_,
+                   "public:\n"
                    "static ::google::protobuf::internal::ExplicitlyConstructed< ::std::string>"
-                   " $default_variable_name$;\n");
+                   " $default_variable_name$;\n"
+                   "private:\n");
   }
 }
 
@@ -140,31 +171,55 @@ GenerateAccessorDeclarations(io::Printer* printer) const {
   }
 
   printer->Print(variables_,
-    "$deprecated_attr$const ::std::string& $name$() const;\n"
-    "$deprecated_attr$void set_$name$(const ::std::string& value);\n");
+                 "$deprecated_attr$const ::std::string& $name$() const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$set_$name$$}$(const ::std::string& value);\n");
+  printer->Annotate("{", "}", descriptor_);
 
-  if (!SupportsArenas(descriptor_)) {
-    printer->Print(variables_,
-      "#if LANG_CXX11\n"
-      "$deprecated_attr$void set_$name$(::std::string&& value);\n"
-      "#endif\n");
-  }
+  printer->Print(variables_,
+                 "#if LANG_CXX11\n"
+                 "$deprecated_attr$void ${$set_$name$$}$(::std::string&& value);\n"
+                 "#endif\n");
+  printer->Annotate("{", "}", descriptor_);
 
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$set_$name$$}$(const char* value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$set_$name$$}$(const $pointer_type$* "
+                 "value, size_t size)"
+                 ";\n");
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(variables_,
-    "$deprecated_attr$void set_$name$(const char* value);\n"
-    "$deprecated_attr$void set_$name$(const $pointer_type$* value, size_t size)"
-                 ";\n"
-    "$deprecated_attr$::std::string* mutable_$name$();\n"
-    "$deprecated_attr$::std::string* $release_name$();\n"
-    "$deprecated_attr$void set_allocated_$name$(::std::string* $name$);\n");
+                 "$deprecated_attr$::std::string* ${$mutable_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_, "$deprecated_attr$::std::string* $release_name$();\n");
+  printer->Annotate("release_name", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$set_allocated_$name$$}$(::std::string* $name$);\n");
+  printer->Annotate("{", "}", descriptor_);
   if (SupportsArenas(descriptor_)) {
-    printer->Print(variables_,
-      "$deprecated_attr$::std::string* unsafe_arena_release_$name$();\n"
-      "$deprecated_attr$void unsafe_arena_set_allocated_$name$(\n"
-      "    ::std::string* $name$);\n");
+    printer->Print(
+        variables_,
+        "PROTOBUF_RUNTIME_DEPRECATED(\"The unsafe_arena_ accessors for\"\n"
+        "\"    string fields are deprecated and will be removed in a\"\n"
+        "\"    future release.\")\n"
+        "::std::string* ${$unsafe_arena_release_$name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
+    printer->Print(
+        variables_,
+        "PROTOBUF_RUNTIME_DEPRECATED(\"The unsafe_arena_ accessors for\"\n"
+        "\"    string fields are deprecated and will be removed in a\"\n"
+        "\"    future release.\")\n"
+        "void ${$unsafe_arena_set_allocated_$name$$}$(\n"
+        "    ::std::string* $name$);\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
-
   if (unknown_ctype) {
     printer->Outdent();
     printer->Print(" public:\n");
@@ -173,56 +228,68 @@ GenerateAccessorDeclarations(io::Printer* printer) const {
 }
 
 void StringFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
   if (SupportsArenas(descriptor_)) {
     printer->Print(
-        variables,
-        "$inline$const ::std::string& $classname$::$name$() const {\n"
+        variables_,
+        "inline const ::std::string& $classname$::$name$() const {\n"
         "  // @@protoc_insertion_point(field_get:$full_name$)\n"
         "  return $name$_.Get();\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const ::std::string& value) {\n"
+        "inline void $classname$::set_$name$(const ::std::string& value) {\n"
         "  $set_hasbit$\n"
-        "  $name$_.Set($default_variable$, value, GetArenaNoVirtual());\n"
+        "  $name$_.Set$lite$($default_variable$, value, GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const char* value) {\n"
+        "#if LANG_CXX11\n"
+        "inline void $classname$::set_$name$(::std::string&& value) {\n"
+        "  $set_hasbit$\n"
+        "  $name$_.Set$lite$(\n"
+        "    $default_variable$, ::std::move(value), GetArenaNoVirtual());\n"
+        "  // @@protoc_insertion_point(field_set_rvalue:$full_name$)\n"
+        "}\n"
+        "#endif\n"
+        "inline void $classname$::set_$name$(const char* value) {\n"
+        "  $null_check$"
         "  $set_hasbit$\n"
-        "  $name$_.Set($default_variable$, $string_piece$(value),\n"
+        "  $name$_.Set$lite$($default_variable$, $string_piece$(value),\n"
         "              GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set_char:$full_name$)\n"
         "}\n"
-        "$inline$"
+        "inline "
         "void $classname$::set_$name$(const $pointer_type$* value,\n"
         "    size_t size) {\n"
         "  $set_hasbit$\n"
-        "  $name$_.Set($default_variable$, $string_piece$(\n"
+        "  $name$_.Set$lite$($default_variable$, $string_piece$(\n"
         "      reinterpret_cast<const char*>(value), size), "
         "GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set_pointer:$full_name$)\n"
         "}\n"
-        "$inline$::std::string* $classname$::mutable_$name$() {\n"
+        "inline ::std::string* $classname$::mutable_$name$() {\n"
         "  $set_hasbit$\n"
         "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
         "  return $name$_.Mutable($default_variable$, GetArenaNoVirtual());\n"
         "}\n"
-        "$inline$::std::string* $classname$::$release_name$() {\n"
-        "  // @@protoc_insertion_point(field_release:$full_name$)\n"
+        "inline ::std::string* $classname$::$release_name$() {\n"
+        "  // @@protoc_insertion_point(field_release:$full_name$)\n");
+
+    if (HasFieldPresence(descriptor_->file())) {
+      printer->Print(variables_,
+        "  if (!has_$name$()) {\n"
+        "    return NULL;\n"
+        "  }\n"
         "  $clear_hasbit$\n"
-        "  return $name$_.Release($default_variable$, GetArenaNoVirtual());\n"
-        "}\n"
-        "$inline$::std::string* $classname$::unsafe_arena_release_$name$() {\n"
-        "  // "
-        "@@protoc_insertion_point(field_unsafe_arena_release:$full_name$)\n"
-        "  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);\n"
+        "  return $name$_.ReleaseNonDefault("
+        "$default_variable$, GetArenaNoVirtual());\n");
+    } else {
+      printer->Print(variables_,
         "  $clear_hasbit$\n"
-        "  return $name$_.UnsafeArenaRelease($default_variable$,\n"
-        "      GetArenaNoVirtual());\n"
+        "  return $name$_.Release($default_variable$, GetArenaNoVirtual());\n");
+    }
+
+    printer->Print(variables_,
         "}\n"
-        "$inline$void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
+        "inline void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
         "  if ($name$ != NULL) {\n"
         "    $set_hasbit$\n"
         "  } else {\n"
@@ -232,7 +299,15 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
         "      GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
         "}\n"
-        "$inline$void $classname$::unsafe_arena_set_allocated_$name$(\n"
+        "inline ::std::string* $classname$::unsafe_arena_release_$name$() {\n"
+        "  // "
+        "@@protoc_insertion_point(field_unsafe_arena_release:$full_name$)\n"
+        "  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);\n"
+        "  $clear_hasbit$\n"
+        "  return $name$_.UnsafeArenaRelease($default_variable$,\n"
+        "      GetArenaNoVirtual());\n"
+        "}\n"
+        "inline void $classname$::unsafe_arena_set_allocated_$name$(\n"
         "    ::std::string* $name$) {\n"
         "  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);\n"
         "  if ($name$ != NULL) {\n"
@@ -248,30 +323,31 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
   } else {
     // No-arena case.
     printer->Print(
-        variables,
-        "$inline$const ::std::string& $classname$::$name$() const {\n"
+        variables_,
+        "inline const ::std::string& $classname$::$name$() const {\n"
         "  // @@protoc_insertion_point(field_get:$full_name$)\n"
         "  return $name$_.GetNoArena();\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const ::std::string& value) {\n"
+        "inline void $classname$::set_$name$(const ::std::string& value) {\n"
         "  $set_hasbit$\n"
         "  $name$_.SetNoArena($default_variable$, value);\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "}\n"
         "#if LANG_CXX11\n"
-        "$inline$void $classname$::set_$name$(::std::string&& value) {\n"
+        "inline void $classname$::set_$name$(::std::string&& value) {\n"
         "  $set_hasbit$\n"
         "  $name$_.SetNoArena(\n"
         "    $default_variable$, ::std::move(value));\n"
         "  // @@protoc_insertion_point(field_set_rvalue:$full_name$)\n"
         "}\n"
         "#endif\n"
-        "$inline$void $classname$::set_$name$(const char* value) {\n"
+        "inline void $classname$::set_$name$(const char* value) {\n"
+        "  $null_check$"
         "  $set_hasbit$\n"
         "  $name$_.SetNoArena($default_variable$, $string_piece$(value));\n"
         "  // @@protoc_insertion_point(field_set_char:$full_name$)\n"
         "}\n"
-        "$inline$"
+        "inline "
         "void $classname$::set_$name$(const $pointer_type$* value, "
         "size_t size) {\n"
         "  $set_hasbit$\n"
@@ -279,17 +355,30 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
         "      $string_piece$(reinterpret_cast<const char*>(value), size));\n"
         "  // @@protoc_insertion_point(field_set_pointer:$full_name$)\n"
         "}\n"
-        "$inline$::std::string* $classname$::mutable_$name$() {\n"
+        "inline ::std::string* $classname$::mutable_$name$() {\n"
         "  $set_hasbit$\n"
         "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
         "  return $name$_.MutableNoArena($default_variable$);\n"
         "}\n"
-        "$inline$::std::string* $classname$::$release_name$() {\n"
-        "  // @@protoc_insertion_point(field_release:$full_name$)\n"
+        "inline ::std::string* $classname$::$release_name$() {\n"
+        "  // @@protoc_insertion_point(field_release:$full_name$)\n");
+
+    if (HasFieldPresence(descriptor_->file())) {
+      printer->Print(variables_,
+        "  if (!has_$name$()) {\n"
+        "    return NULL;\n"
+        "  }\n"
         "  $clear_hasbit$\n"
-        "  return $name$_.ReleaseNoArena($default_variable$);\n"
+        "  return $name$_.ReleaseNonDefaultNoArena($default_variable$);\n");
+    } else {
+      printer->Print(variables_,
+        "  $clear_hasbit$\n"
+        "  return $name$_.ReleaseNoArena($default_variable$);\n");
+    }
+
+    printer->Print(variables_,
         "}\n"
-        "$inline$void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
+        "inline void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
         "  if ($name$ != NULL) {\n"
         "    $set_hasbit$\n"
         "  } else {\n"
@@ -306,7 +395,7 @@ GenerateNonInlineAccessorDefinitions(io::Printer* printer) const {
   if (!descriptor_->default_value_string().empty()) {
     // Initialized in GenerateDefaultInstanceAllocator.
     printer->Print(variables_,
-                   "::google::protobuf::internal::ExplicitlyConstructed< ::std::string> "
+                   "::google::protobuf::internal::ExplicitlyConstructed<::std::string> "
                    "$classname$::$default_variable_name$;\n");
   }
 }
@@ -346,18 +435,34 @@ GenerateMessageClearingCode(io::Printer* printer) const {
   // If we have field presence, then the Clear() method of the protocol buffer
   // will have checked that this field is set.  If so, we can avoid redundant
   // checks against default_variable.
-  const bool must_be_present = HasFieldPresence(descriptor_->file());
-
-  if (must_be_present) {
+  const bool must_be_present =
+      HasFieldPresence(descriptor_->file());
+
+  if (inlined_ && must_be_present) {
+    // Calling mutable_$name$() gives us a string reference and sets the has bit
+    // for $name$ (in proto2).  We may get here when the string field is inlined
+    // but the string's contents have not been changed by the user, so we cannot
+    // make an assertion about the contents of the string and could never make
+    // an assertion about the string instance.
+    //
+    // For non-inlined strings, we distinguish from non-default by comparing
+    // instances, rather than contents.
     printer->Print(variables_,
       "GOOGLE_DCHECK(!$name$_.IsDefault($default_variable$));\n");
   }
 
   if (SupportsArenas(descriptor_)) {
     if (descriptor_->default_value_string().empty()) {
-      printer->Print(variables_,
-        "$name$_.ClearToEmpty($default_variable$, GetArenaNoVirtual());\n");
+      if (must_be_present) {
+        printer->Print(variables_,
+          "$name$_.ClearNonDefaultToEmpty();\n");
+      } else {
+        printer->Print(variables_,
+          "$name$_.ClearToEmpty($default_variable$, GetArenaNoVirtual());\n");
+      }
     } else {
+      // Clear to a non-empty default is more involved, as we try to use the
+      // Arena if one is present and may need to reallocate the string.
       printer->Print(variables_,
         "$name$_.ClearToDefault($default_variable$, GetArenaNoVirtual());\n");
     }
@@ -365,11 +470,11 @@ GenerateMessageClearingCode(io::Printer* printer) const {
     // When Arenas are disabled and field presence has been checked, we can
     // safely treat the ArenaStringPtr as a string*.
     if (descriptor_->default_value_string().empty()) {
-      printer->Print(variables_,
-        "(*$name$_.UnsafeRawStringPointer())->clear();\n");
+      printer->Print(variables_, "$name$_.ClearNonDefaultToEmptyNoArena();\n");
     } else {
-      printer->Print(variables_,
-        "(*$name$_.UnsafeRawStringPointer())->assign(*$default_variable$);\n");
+      printer->Print(
+          variables_,
+          "$name$_.UnsafeMutablePointer()->assign(*$default_variable$);\n");
     }
   } else {
     if (descriptor_->default_value_string().empty()) {
@@ -396,13 +501,29 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void StringFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.Swap(&other->$name$_);\n");
+  if (inlined_) {
+    printer->Print(
+        variables_,
+        "$name$_.Swap(&other->$name$_);\n");
+  } else {
+    printer->Print(
+        variables_,
+        "$name$_.Swap(&other->$name$_, $default_variable$,\n"
+        "  GetArenaNoVirtual());\n");
+  }
 }
 
 void StringFieldGenerator::
 GenerateConstructorCode(io::Printer* printer) const {
+  // TODO(ckennelly): Construct non-empty strings as part of the initializer
+  // list.
+  if (inlined_ && descriptor_->default_value_string().empty()) {
+    // Automatic initialization will construct the string.
+    return;
+  }
+
   printer->Print(variables_,
-      "$name$_.UnsafeSetDefault($default_variable$);\n");
+                 "$name$_.UnsafeSetDefault($default_variable$);\n");
 }
 
 void StringFieldGenerator::
@@ -422,7 +543,7 @@ GenerateCopyConstructorCode(io::Printer* printer) const {
   if (SupportsArenas(descriptor_) || descriptor_->containing_oneof() != NULL) {
     // TODO(gpike): improve this
     printer->Print(variables_,
-      "$name$_.Set($default_variable$, from.$name$(),\n"
+      "$name$_.Set$lite$($default_variable$, from.$name$(),\n"
       "  GetArenaNoVirtual());\n");
   } else {
     printer->Print(variables_,
@@ -435,32 +556,36 @@ GenerateCopyConstructorCode(io::Printer* printer) const {
 
 void StringFieldGenerator::
 GenerateDestructorCode(io::Printer* printer) const {
-  if (SupportsArenas(descriptor_)) {
-    // The variable |arena| is defined by the enclosing code.
-    // See MessageGenerator::GenerateSharedDestructorCode.
-    printer->Print(variables_,
-      "$name$_.Destroy($default_variable$, arena);\n");
-  } else {
-    printer->Print(variables_,
-      "$name$_.DestroyNoArena($default_variable$);\n");
+  if (inlined_) {
+    // The destructor is automatically invoked.
+    return;
   }
+
+  printer->Print(variables_, "$name$_.DestroyNoArena($default_variable$);\n");
 }
 
-void StringFieldGenerator::
-GenerateDefaultInstanceAllocator(io::Printer* printer) const {
-  if (!descriptor_->default_value_string().empty()) {
-    printer->Print(variables_,
-                   "$classname$::$default_variable_name$.DefaultConstruct();\n"
-                   "*$classname$::$default_variable_name$.get_mutable() = "
-                   "::std::string($default$, $default_length$);\n");
+bool StringFieldGenerator::GenerateArenaDestructorCode(
+    io::Printer* printer) const {
+  if (!inlined_) {
+    return false;
   }
+
+  printer->Print(variables_,
+                 "_this->$name$_.DestroyNoArena($default_variable$);\n");
+  return true;
 }
 
 void StringFieldGenerator::
-GenerateShutdownCode(io::Printer* printer) const {
+GenerateDefaultInstanceAllocator(io::Printer* printer) const {
   if (!descriptor_->default_value_string().empty()) {
-    printer->Print(variables_,
-                   "$classname$::$default_variable_name$.Shutdown();\n");
+    printer->Print(
+        variables_,
+        "$ns$::$classname$::$default_variable_name$.DefaultConstruct();\n"
+        "*$ns$::$classname$::$default_variable_name$.get_mutable() = "
+        "::std::string($default$, $default_length$);\n"
+        "::google::protobuf::internal::OnShutdownDestroyString(\n"
+        "    $ns$::$classname$::$default_variable_name$.get_mutable());\n"
+    );
   }
 }
 
@@ -473,16 +598,23 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, true, variables_,
-        "this->$name$().data(), this->$name$().length(),\n", printer);
+        "this->$name$().data(), static_cast<int>(this->$name$().length()),\n",
+        printer);
   }
 }
 
+bool StringFieldGenerator::
+MergeFromCodedStreamNeedsArena() const {
+  return false;
+}
+
 void StringFieldGenerator::
 GenerateSerializeWithCachedSizes(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, false, variables_,
-        "this->$name$().data(), this->$name$().length(),\n", printer);
+        "this->$name$().data(), static_cast<int>(this->$name$().length()),\n",
+        printer);
   }
   printer->Print(variables_,
     "::google::protobuf::internal::WireFormatLite::Write$declared_type$MaybeAliased(\n"
@@ -494,7 +626,8 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, false, variables_,
-        "this->$name$().data(), this->$name$().length(),\n", printer);
+        "this->$name$().data(), static_cast<int>(this->$name$().length()),\n",
+        printer);
   }
   printer->Print(variables_,
     "target =\n"
@@ -510,120 +643,136 @@ GenerateByteSize(io::Printer* printer) const {
     "    this->$name$());\n");
 }
 
+uint32 StringFieldGenerator::CalculateFieldTag() const {
+  return inlined_ ? 1 : 0;
+}
+
 // ===================================================================
 
-StringOneofFieldGenerator::
-StringOneofFieldGenerator(const FieldDescriptor* descriptor,
-                          const Options& options)
-    : StringFieldGenerator(descriptor, options),
-      dependent_field_(options.proto_h) {
+StringOneofFieldGenerator::StringOneofFieldGenerator(
+    const FieldDescriptor* descriptor, const Options& options)
+    : StringFieldGenerator(descriptor, options) {
+  inlined_ = false;
+
   SetCommonOneofFieldVariables(descriptor, &variables_);
 }
 
 StringOneofFieldGenerator::~StringOneofFieldGenerator() {}
 
 void StringOneofFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
   if (SupportsArenas(descriptor_)) {
     printer->Print(
-        variables,
-        "$inline$const ::std::string& $classname$::$name$() const {\n"
+        variables_,
+        "inline const ::std::string& $classname$::$name$() const {\n"
         "  // @@protoc_insertion_point(field_get:$full_name$)\n"
         "  if (has_$name$()) {\n"
-        "    return $oneof_prefix$$name$_.Get();\n"
+        "    return $field_member$.Get();\n"
         "  }\n"
         "  return *$default_variable$;\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const ::std::string& value) {\n"
+        "inline void $classname$::set_$name$(const ::std::string& value) {\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.Set($default_variable$, value,\n"
+        "  $field_member$.Set$lite$($default_variable$, value,\n"
         "      GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const char* value) {\n"
+        "#if LANG_CXX11\n"
+        "inline void $classname$::set_$name$(::std::string&& value) {\n"
+        "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.Set($default_variable$,\n"
+        "  $field_member$.Set$lite$(\n"
+        "    $default_variable$, ::std::move(value), GetArenaNoVirtual());\n"
+        "  // @@protoc_insertion_point(field_set_rvalue:$full_name$)\n"
+        "}\n"
+        "#endif\n"
+        "inline void $classname$::set_$name$(const char* value) {\n"
+        "  $null_check$"
+        "  if (!has_$name$()) {\n"
+        "    clear_$oneof_name$();\n"
+        "    set_has_$name$();\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
+        "  }\n"
+        "  $field_member$.Set$lite$($default_variable$,\n"
         "      $string_piece$(value), GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set_char:$full_name$)\n"
         "}\n"
-        "$inline$"
+        "inline "
         "void $classname$::set_$name$(const $pointer_type$* value,\n"
         "                             size_t size) {\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.Set($default_variable$, $string_piece$(\n"
+        "  $field_member$.Set$lite$(\n"
+        "      $default_variable$, $string_piece$(\n"
         "      reinterpret_cast<const char*>(value), size),\n"
         "      GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_set_pointer:$full_name$)\n"
         "}\n"
-        "$inline$::std::string* $classname$::mutable_$name$() {\n"
+        "inline ::std::string* $classname$::mutable_$name$() {\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  return $oneof_prefix$$name$_.Mutable($default_variable$,\n"
+        "  return $field_member$.Mutable($default_variable$,\n"
         "      GetArenaNoVirtual());\n"
         "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
         "}\n"
-        "$inline$::std::string* $classname$::$release_name$() {\n"
+        "inline ::std::string* $classname$::$release_name$() {\n"
         "  // @@protoc_insertion_point(field_release:$full_name$)\n"
         "  if (has_$name$()) {\n"
         "    clear_has_$oneof_name$();\n"
-        "    return $oneof_prefix$$name$_.Release($default_variable$,\n"
+        "    return $field_member$.Release($default_variable$,\n"
         "        GetArenaNoVirtual());\n"
         "  } else {\n"
         "    return NULL;\n"
         "  }\n"
         "}\n"
-        "$inline$::std::string* $classname$::unsafe_arena_release_$name$() {\n"
+        "inline void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
+        "  if (!has_$name$()) {\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
+        "  }\n"
+        "  clear_$oneof_name$();\n"
+        "  if ($name$ != NULL) {\n"
+        "    set_has_$name$();\n"
+        "    $field_member$.SetAllocated($default_variable$, $name$,\n"
+        "        GetArenaNoVirtual());\n"
+        "  }\n"
+        "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
+        "}\n"
+        "inline ::std::string* $classname$::unsafe_arena_release_$name$() {\n"
         "  // "
         "@@protoc_insertion_point(field_unsafe_arena_release:$full_name$)\n"
         "  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);\n"
         "  if (has_$name$()) {\n"
         "    clear_has_$oneof_name$();\n"
-        "    return $oneof_prefix$$name$_.UnsafeArenaRelease(\n"
+        "    return $field_member$.UnsafeArenaRelease(\n"
         "        $default_variable$, GetArenaNoVirtual());\n"
         "  } else {\n"
         "    return NULL;\n"
         "  }\n"
         "}\n"
-        "$inline$void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
-        "  if (!has_$name$()) {\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
-        "  }\n"
-        "  clear_$oneof_name$();\n"
-        "  if ($name$ != NULL) {\n"
-        "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.SetAllocated($default_variable$, $name$,\n"
-        "        GetArenaNoVirtual());\n"
-        "  }\n"
-        "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
-        "}\n"
-        "$inline$void $classname$::unsafe_arena_set_allocated_$name$("
+        "inline void $classname$::unsafe_arena_set_allocated_$name$("
         "::std::string* $name$) {\n"
         "  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);\n"
         "  if (!has_$name$()) {\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
         "  clear_$oneof_name$();\n"
         "  if ($name$) {\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeArenaSetAllocated($default_variable$, "
+        "    $field_member$.UnsafeArenaSetAllocated($default_variable$, "
         "$name$, GetArenaNoVirtual());\n"
         "  }\n"
         "  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:"
@@ -632,87 +781,85 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
   } else {
     // No-arena case.
     printer->Print(
-        variables,
-        "$inline$const ::std::string& $classname$::$name$() const {\n"
+        variables_,
+        "inline const ::std::string& $classname$::$name$() const {\n"
         "  // @@protoc_insertion_point(field_get:$full_name$)\n"
         "  if (has_$name$()) {\n"
-        "    return $oneof_prefix$$name$_.GetNoArena();\n"
+        "    return $field_member$.GetNoArena();\n"
         "  }\n"
         "  return *$default_variable$;\n"
         "}\n"
-        "$inline$void $classname$::set_$name$(const ::std::string& value) {\n"
+        "inline void $classname$::set_$name$(const ::std::string& value) {\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.SetNoArena($default_variable$, value);\n"
+        "  $field_member$.SetNoArena($default_variable$, value);\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "}\n"
         "#if LANG_CXX11\n"
-        "$inline$void $classname$::set_$name$(::std::string&& value) {\n"
+        "inline void $classname$::set_$name$(::std::string&& value) {\n"
         "  // @@protoc_insertion_point(field_set:$full_name$)\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.SetNoArena(\n"
-        "    $default_variable$, ::std::move(value));\n"
+        "  $field_member$.SetNoArena($default_variable$, ::std::move(value));\n"
         "  // @@protoc_insertion_point(field_set_rvalue:$full_name$)\n"
         "}\n"
         "#endif\n"
-        "$inline$void $classname$::set_$name$(const char* value) {\n"
+        "inline void $classname$::set_$name$(const char* value) {\n"
+        "  $null_check$"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.SetNoArena($default_variable$,\n"
+        "  $field_member$.SetNoArena($default_variable$,\n"
         "      $string_piece$(value));\n"
         "  // @@protoc_insertion_point(field_set_char:$full_name$)\n"
         "}\n"
-        "$inline$"
+        "inline "
         "void $classname$::set_$name$(const $pointer_type$* value, size_t "
         "size) {\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
-        "  $oneof_prefix$$name$_.SetNoArena($default_variable$, "
-        "$string_piece$(\n"
+        "  $field_member$.SetNoArena($default_variable$, $string_piece$(\n"
         "      reinterpret_cast<const char*>(value), size));\n"
         "  // @@protoc_insertion_point(field_set_pointer:$full_name$)\n"
         "}\n"
-        "$inline$::std::string* $classname$::mutable_$name$() {\n"
+        "inline ::std::string* $classname$::mutable_$name$() {\n"
         "  if (!has_$name$()) {\n"
         "    clear_$oneof_name$();\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
         "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
-        "  return $oneof_prefix$$name$_.MutableNoArena($default_variable$);\n"
+        "  return $field_member$.MutableNoArena($default_variable$);\n"
         "}\n"
-        "$inline$::std::string* $classname$::$release_name$() {\n"
+        "inline ::std::string* $classname$::$release_name$() {\n"
         "  // @@protoc_insertion_point(field_release:$full_name$)\n"
         "  if (has_$name$()) {\n"
         "    clear_has_$oneof_name$();\n"
-        "    return $oneof_prefix$$name$_.ReleaseNoArena($default_variable$);\n"
+        "    return $field_member$.ReleaseNoArena($default_variable$);\n"
         "  } else {\n"
         "    return NULL;\n"
         "  }\n"
         "}\n"
-        "$inline$void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
+        "inline void $classname$::set_allocated_$name$(::std::string* $name$) {\n"
         "  if (!has_$name$()) {\n"
-        "    $oneof_prefix$$name$_.UnsafeSetDefault($default_variable$);\n"
+        "    $field_member$.UnsafeSetDefault($default_variable$);\n"
         "  }\n"
         "  clear_$oneof_name$();\n"
         "  if ($name$ != NULL) {\n"
         "    set_has_$name$();\n"
-        "    $oneof_prefix$$name$_.SetAllocatedNoArena($default_variable$,\n"
-        "        $name$);\n"
+        "    $field_member$.SetAllocatedNoArena($default_variable$, $name$);\n"
         "  }\n"
         "  // @@protoc_insertion_point(field_set_allocated:$full_name$)\n"
         "}\n");
@@ -721,30 +868,13 @@ GenerateInlineAccessorDefinitions(io::Printer* printer,
 
 void StringOneofFieldGenerator::
 GenerateClearingCode(io::Printer* printer) const {
-  std::map<string, string> variables(variables_);
-  if (dependent_field_) {
-    variables["this_message"] = DependentBaseDownCast();
-    // This clearing code may be in the dependent base class. If the default
-    // value is an empty string, then the $default_variable$ is a global
-    // singleton. If the default is not empty, we need to down-cast to get the
-    // default value's global singleton instance. See SetStringVariables() for
-    // possible values of default_variable.
-    if (!descriptor_->default_value_string().empty()) {
-      variables["default_variable"] = "&" + DependentBaseDownCast() +
-                                      variables["default_variable_name"] +
-                                      ".get()";
-    }
-  } else {
-    variables["this_message"] = "";
-  }
   if (SupportsArenas(descriptor_)) {
-    printer->Print(variables,
-      "$this_message$$oneof_prefix$$name$_.Destroy($default_variable$,\n"
-      "    $this_message$GetArenaNoVirtual());\n");
+    printer->Print(variables_,
+      "$field_member$.Destroy($default_variable$,\n"
+      "    GetArenaNoVirtual());\n");
   } else {
-    printer->Print(variables,
-      "$this_message$$oneof_prefix$$name$_."
-      "DestroyNoArena($default_variable$);\n");
+    printer->Print(variables_,
+      "$field_member$.DestroyNoArena($default_variable$);\n");
   }
 }
 
@@ -762,24 +892,16 @@ void StringOneofFieldGenerator::
 GenerateConstructorCode(io::Printer* printer) const {
   printer->Print(
       variables_,
-      "_$classname$_default_instance_.$name$_.UnsafeSetDefault(\n"
+      "$ns$::_$classname$_default_instance_.$name$_.UnsafeSetDefault(\n"
       "    $default_variable$);\n");
 }
 
 void StringOneofFieldGenerator::
 GenerateDestructorCode(io::Printer* printer) const {
-  if (SupportsArenas(descriptor_)) {
-    printer->Print(variables_,
-      "if (has_$name$()) {\n"
-      "  $oneof_prefix$$name$_.Destroy($default_variable$,\n"
-      "      GetArenaNoVirtual());\n"
-      "}\n");
-  } else {
-    printer->Print(variables_,
-      "if (has_$name$()) {\n"
-      "  $oneof_prefix$$name$_.DestroyNoArena($default_variable$);\n"
-      "}\n");
-  }
+  printer->Print(variables_,
+    "if (has_$name$()) {\n"
+    "  $field_member$.DestroyNoArena($default_variable$);\n"
+    "}\n");
 }
 
 void StringOneofFieldGenerator::
@@ -791,7 +913,8 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, true, variables_,
-        "this->$name$().data(), this->$name$().length(),\n", printer);
+        "this->$name$().data(), static_cast<int>(this->$name$().length()),\n",
+        printer);
   }
 }
 
@@ -827,28 +950,62 @@ GenerateAccessorDeclarations(io::Printer* printer) const {
   }
 
   printer->Print(variables_,
-    "$deprecated_attr$const ::std::string& $name$(int index) const;\n"
-    "$deprecated_attr$::std::string* mutable_$name$(int index);\n"
-    "$deprecated_attr$void set_$name$(int index, const ::std::string& value);\n"
-    "#if LANG_CXX11\n"
-    "$deprecated_attr$void set_$name$(int index, ::std::string&& value);\n"
-    "#endif\n"
-    "$deprecated_attr$void set_$name$(int index, const char* value);\n"
-    ""
-    "$deprecated_attr$void set_$name$("
-                 "int index, const $pointer_type$* value, size_t size);\n"
-    "$deprecated_attr$::std::string* add_$name$();\n"
-    "$deprecated_attr$void add_$name$(const ::std::string& value);\n"
-    "#if LANG_CXX11\n"
-    "$deprecated_attr$void add_$name$(::std::string&& value);\n"
-    "#endif\n"
-    "$deprecated_attr$void add_$name$(const char* value);\n"
-    "$deprecated_attr$void add_$name$(const $pointer_type$* value, size_t size)"
-                 ";\n"
-    "$deprecated_attr$const ::google::protobuf::RepeatedPtrField< ::std::string>& $name$() "
-                 "const;\n"
-    "$deprecated_attr$::google::protobuf::RepeatedPtrField< ::std::string>* mutable_$name$()"
+                 "$deprecated_attr$const ::std::string& $name$(int index) const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$::std::string* ${$mutable_$name$$}$(int index);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$set_$name$$}$(int index, const "
+                 "::std::string& value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(
+      variables_,
+      "#if LANG_CXX11\n"
+      "$deprecated_attr$void ${$set_$name$$}$(int index, ::std::string&& value);\n"
+      "#endif\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$set_$name$$}$(int index, const "
+                 "char* value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 ""
+                 "$deprecated_attr$void ${$set_$name$$}$("
+                 "int index, const $pointer_type$* value, size_t size);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$::std::string* ${$add_$name$$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$add_$name$$}$(const ::std::string& value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "#if LANG_CXX11\n"
+                 "$deprecated_attr$void ${$add_$name$$}$(::std::string&& value);\n"
+                 "#endif\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$void ${$add_$name$$}$(const char* value);\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$void ${$add_$name$$}$(const $pointer_type$* "
+                 "value, size_t size)"
                  ";\n");
+  printer->Annotate("{", "}", descriptor_);
+  printer->Print(
+      variables_,
+      "$deprecated_attr$const ::google::protobuf::RepeatedPtrField< ::std::string>& $name$() "
+      "const;\n");
+  printer->Annotate("name", descriptor_);
+  printer->Print(variables_,
+                 "$deprecated_attr$::google::protobuf::RepeatedPtrField< ::std::string>* "
+                 "${$mutable_$name$$}$()"
+                 ";\n");
+  printer->Annotate("{", "}", descriptor_);
 
   if (unknown_ctype) {
     printer->Outdent();
@@ -858,69 +1015,78 @@ GenerateAccessorDeclarations(io::Printer* printer) const {
 }
 
 void RepeatedStringFieldGenerator::
-GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                  bool is_inline) const {
-  std::map<string, string> variables(variables_);
-  variables["inline"] = is_inline ? "inline " : "";
-  printer->Print(variables,
-    "$inline$const ::std::string& $classname$::$name$(int index) const {\n"
-    "  // @@protoc_insertion_point(field_get:$full_name$)\n"
-    "  return $name$_.$cppget$(index);\n"
-    "}\n"
-    "$inline$::std::string* $classname$::mutable_$name$(int index) {\n"
+GenerateInlineAccessorDefinitions(io::Printer* printer) const {
+  if (options_.safe_boundary_check) {
+    printer->Print(variables_,
+      "inline const ::std::string& $classname$::$name$(int index) const {\n"
+      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
+      "  return $name$_.InternalCheckedGet(\n"
+      "      index, ::google::protobuf::internal::GetEmptyStringAlreadyInited());\n"
+      "}\n");
+  } else {
+    printer->Print(variables_,
+      "inline const ::std::string& $classname$::$name$(int index) const {\n"
+      "  // @@protoc_insertion_point(field_get:$full_name$)\n"
+      "  return $name$_.Get(index);\n"
+      "}\n");
+  }
+  printer->Print(variables_,
+    "inline ::std::string* $classname$::mutable_$name$(int index) {\n"
     "  // @@protoc_insertion_point(field_mutable:$full_name$)\n"
     "  return $name$_.Mutable(index);\n"
     "}\n"
-    "$inline$void $classname$::set_$name$(int index, const ::std::string& value) {\n"
+    "inline void $classname$::set_$name$(int index, const ::std::string& value) {\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "  $name$_.Mutable(index)->assign(value);\n"
     "}\n"
     "#if LANG_CXX11\n"
-    "$inline$void $classname$::set_$name$(int index, ::std::string&& value) {\n"
+    "inline void $classname$::set_$name$(int index, ::std::string&& value) {\n"
     "  // @@protoc_insertion_point(field_set:$full_name$)\n"
     "  $name$_.Mutable(index)->assign(std::move(value));\n"
     "}\n"
     "#endif\n"
-    "$inline$void $classname$::set_$name$(int index, const char* value) {\n"
+    "inline void $classname$::set_$name$(int index, const char* value) {\n"
+    "  $null_check$"
     "  $name$_.Mutable(index)->assign(value);\n"
     "  // @@protoc_insertion_point(field_set_char:$full_name$)\n"
     "}\n"
-    "$inline$void "
+    "inline void "
     "$classname$::set_$name$"
     "(int index, const $pointer_type$* value, size_t size) {\n"
     "  $name$_.Mutable(index)->assign(\n"
     "    reinterpret_cast<const char*>(value), size);\n"
     "  // @@protoc_insertion_point(field_set_pointer:$full_name$)\n"
     "}\n"
-    "$inline$::std::string* $classname$::add_$name$() {\n"
+    "inline ::std::string* $classname$::add_$name$() {\n"
     "  // @@protoc_insertion_point(field_add_mutable:$full_name$)\n"
     "  return $name$_.Add();\n"
     "}\n"
-    "$inline$void $classname$::add_$name$(const ::std::string& value) {\n"
+    "inline void $classname$::add_$name$(const ::std::string& value) {\n"
     "  $name$_.Add()->assign(value);\n"
     "  // @@protoc_insertion_point(field_add:$full_name$)\n"
     "}\n"
     "#if LANG_CXX11\n"
-    "$inline$void $classname$::add_$name$(::std::string&& value) {\n"
-    "  $name$_.Add()->assign(std::move(value));\n"
+    "inline void $classname$::add_$name$(::std::string&& value) {\n"
+    "  $name$_.Add(std::move(value));\n"
     "  // @@protoc_insertion_point(field_add:$full_name$)\n"
     "}\n"
     "#endif\n"
-    "$inline$void $classname$::add_$name$(const char* value) {\n"
+    "inline void $classname$::add_$name$(const char* value) {\n"
+    "  $null_check$"
     "  $name$_.Add()->assign(value);\n"
     "  // @@protoc_insertion_point(field_add_char:$full_name$)\n"
     "}\n"
-    "$inline$void "
+    "inline void "
     "$classname$::add_$name$(const $pointer_type$* value, size_t size) {\n"
     "  $name$_.Add()->assign(reinterpret_cast<const char*>(value), size);\n"
     "  // @@protoc_insertion_point(field_add_pointer:$full_name$)\n"
     "}\n"
-    "$inline$const ::google::protobuf::RepeatedPtrField< ::std::string>&\n"
+    "inline const ::google::protobuf::RepeatedPtrField< ::std::string>&\n"
     "$classname$::$name$() const {\n"
     "  // @@protoc_insertion_point(field_list:$full_name$)\n"
     "  return $name$_;\n"
     "}\n"
-    "$inline$::google::protobuf::RepeatedPtrField< ::std::string>*\n"
+    "inline ::google::protobuf::RepeatedPtrField< ::std::string>*\n"
     "$classname$::mutable_$name$() {\n"
     "  // @@protoc_insertion_point(field_mutable_list:$full_name$)\n"
     "  return &$name$_;\n"
@@ -939,7 +1105,8 @@ GenerateMergingCode(io::Printer* printer) const {
 
 void RepeatedStringFieldGenerator::
 GenerateSwappingCode(io::Printer* printer) const {
-  printer->Print(variables_, "$name$_.UnsafeArenaSwap(&other->$name$_);\n");
+  printer->Print(variables_,
+                 "$name$_.InternalSwap(CastToBase(&other->$name$_));\n");
 }
 
 void RepeatedStringFieldGenerator::
@@ -961,7 +1128,7 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, true, variables_,
         "this->$name$(this->$name$_size() - 1).data(),\n"
-        "this->$name$(this->$name$_size() - 1).length(),\n",
+        "static_cast<int>(this->$name$(this->$name$_size() - 1).length()),\n",
         printer);
   }
 }
@@ -969,12 +1136,13 @@ GenerateMergeFromCodedStream(io::Printer* printer) const {
 void RepeatedStringFieldGenerator::
 GenerateSerializeWithCachedSizes(io::Printer* printer) const {
   printer->Print(variables_,
-    "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
+        "for (int i = 0, n = this->$name$_size(); i < n; i++) {\n");
   printer->Indent();
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, false, variables_,
-        "this->$name$(i).data(), this->$name$(i).length(),\n", printer);
+        "this->$name$(i).data(), static_cast<int>(this->$name$(i).length()),\n",
+        printer);
   }
   printer->Outdent();
   printer->Print(variables_,
@@ -991,7 +1159,8 @@ GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const {
   if (descriptor_->type() == FieldDescriptor::TYPE_STRING) {
     GenerateUtf8CheckCodeForString(
         descriptor_, options_, false, variables_,
-        "this->$name$(i).data(), this->$name$(i).length(),\n", printer);
+        "this->$name$(i).data(), static_cast<int>(this->$name$(i).length()),\n",
+        printer);
   }
   printer->Outdent();
   printer->Print(variables_,
diff --git a/src/google/protobuf/compiler/cpp/cpp_string_field.h b/src/google/protobuf/compiler/cpp/cpp_string_field.h
index af263c1a..6cbf722f 100644
--- a/src/google/protobuf/compiler/cpp/cpp_string_field.h
+++ b/src/google/protobuf/compiler/cpp/cpp_string_field.h
@@ -54,8 +54,7 @@ class StringFieldGenerator : public FieldGenerator {
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateStaticMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateNonInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMessageClearingCode(io::Printer* printer) const;
@@ -64,16 +63,22 @@ class StringFieldGenerator : public FieldGenerator {
   void GenerateConstructorCode(io::Printer* printer) const;
   void GenerateCopyConstructorCode(io::Printer* printer) const;
   void GenerateDestructorCode(io::Printer* printer) const;
+  bool GenerateArenaDestructorCode(io::Printer* printer) const;
   void GenerateDefaultInstanceAllocator(io::Printer* printer) const;
-  void GenerateShutdownCode(io::Printer* printer) const;
   void GenerateMergeFromCodedStream(io::Printer* printer) const;
   void GenerateSerializeWithCachedSizes(io::Printer* printer) const;
   void GenerateSerializeWithCachedSizesToArray(io::Printer* printer) const;
   void GenerateByteSize(io::Printer* printer) const;
+  uint32 CalculateFieldTag() const;
+  bool IsInlined() const { return inlined_; }
+
+  bool MergeFromCodedStreamNeedsArena() const;
 
  protected:
   const FieldDescriptor* descriptor_;
   std::map<string, string> variables_;
+  const bool lite_;
+  bool inlined_;
 
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StringFieldGenerator);
@@ -86,8 +91,7 @@ class StringOneofFieldGenerator : public StringFieldGenerator {
   ~StringOneofFieldGenerator();
 
   // implements FieldGenerator ---------------------------------------
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
 
   // StringFieldGenerator, from which we inherit, overrides this so we need to
@@ -99,7 +103,6 @@ class StringOneofFieldGenerator : public StringFieldGenerator {
   void GenerateMergeFromCodedStream(io::Printer* printer) const;
 
  private:
-  const bool dependent_field_;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StringOneofFieldGenerator);
 };
 
@@ -112,8 +115,7 @@ class RepeatedStringFieldGenerator : public FieldGenerator {
   // implements FieldGenerator ---------------------------------------
   void GeneratePrivateMembers(io::Printer* printer) const;
   void GenerateAccessorDeclarations(io::Printer* printer) const;
-  void GenerateInlineAccessorDefinitions(io::Printer* printer,
-                                         bool is_inline) const;
+  void GenerateInlineAccessorDefinitions(io::Printer* printer) const;
   void GenerateClearingCode(io::Printer* printer) const;
   void GenerateMergingCode(io::Printer* printer) const;
   void GenerateSwappingCode(io::Printer* printer) const;
diff --git a/src/google/protobuf/compiler/cpp/cpp_test_bad_identifiers.proto b/src/google/protobuf/compiler/cpp/cpp_test_bad_identifiers.proto
index 4e25b2ea..7fe98759 100644
--- a/src/google/protobuf/compiler/cpp/cpp_test_bad_identifiers.proto
+++ b/src/google/protobuf/compiler/cpp/cpp_test_bad_identifiers.proto
@@ -151,6 +151,10 @@ enum ConflictingEnum {  // NO_PROTO3
 
 message DummyMessage {}
 
+// Message names that could conflict.
+message Shutdown {}
+message TableStruct {}
+
 service TestConflictingMethodNames {
   rpc Closure(DummyMessage) returns (DummyMessage);
 }
diff --git a/src/google/protobuf/compiler/cpp/cpp_unittest.cc b/src/google/protobuf/compiler/cpp/cpp_unittest.cc
index 6d68ec35..22b759a9 100644
--- a/src/google/protobuf/compiler/cpp/cpp_unittest.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_unittest.cc
@@ -46,41 +46,26 @@
 
 #include <google/protobuf/compiler/cpp/cpp_unittest.h>
 
-#include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
-#include <vector>
-
 #include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/unittest_no_arena.pb.h>
 #include <google/protobuf/unittest_optimize_for.pb.h>
 #include <google/protobuf/unittest_embed_optimize_for.pb.h>
-#if !defined(GOOGLE_PROTOBUF_CMAKE_BUILD) && !defined(_MSC_VER)
-// We exclude this large proto from cmake build because it's too large for
-// visual studio to compile (report internal errors).
-#include <google/protobuf/unittest_enormous_descriptor.pb.h>
-#endif
-#include <google/protobuf/unittest_no_generic_services.pb.h>
+
 #include <google/protobuf/test_util.h>
-#include <google/protobuf/compiler/cpp/cpp_helpers.h>
-#include <google/protobuf/compiler/cpp/cpp_test_bad_identifiers.pb.h>
-#include <google/protobuf/compiler/importer.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/arena.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/dynamic_message.h>
 
-#include <google/protobuf/stubs/callback.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/stubs/substitute.h>
-#include <google/protobuf/testing/googletest.h>
-#include <gtest/gtest.h>
-#include <google/protobuf/stubs/stl_util.h>
+#define MESSAGE_TEST_NAME MessageTest
+#define GENERATED_DESCRIPTOR_TEST_NAME GeneratedDescriptorTest
+#define GENERATED_MESSAGE_TEST_NAME GeneratedMessageTest
+#define GENERATED_ENUM_TEST_NAME GeneratedEnumTest
+#define GENERATED_SERVICE_TEST_NAME GeneratedServiceTest
+#define HELPERS_TEST_NAME HelpersTest
+#define DESCRIPTOR_INIT_TEST_NAME DescriptorInitializationTest
+
+#define UNITTEST_PROTO_PATH "google/protobuf/unittest.proto"
+#define UNITTEST ::protobuf_unittest
+#define UNITTEST_IMPORT ::protobuf_unittest_import
+
+// Must include after the above macros.
+#include <google/protobuf/compiler/cpp/cpp_unittest.inc>
 
 namespace google {
 namespace protobuf {
@@ -92,802 +77,14 @@ namespace cpp_unittest {
 
 namespace protobuf_unittest = ::protobuf_unittest;
 
-
-class MockErrorCollector : public MultiFileErrorCollector {
- public:
-  MockErrorCollector() {}
-  ~MockErrorCollector() {}
-
-  string text_;
-
-  // implements ErrorCollector ---------------------------------------
-  void AddError(const string& filename, int line, int column,
-                const string& message) {
-    strings::SubstituteAndAppend(&text_, "$0:$1:$2: $3\n",
-                                 filename, line, column, message);
-  }
-};
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-
-// Test that generated code has proper descriptors:
-// Parse a descriptor directly (using google::protobuf::compiler::Importer) and
-// compare it to the one that was produced by generated code.
-TEST(GeneratedDescriptorTest, IdenticalDescriptors) {
-  const FileDescriptor* generated_descriptor =
-    unittest::TestAllTypes::descriptor()->file();
-
-  // Set up the Importer.
-  MockErrorCollector error_collector;
-  DiskSourceTree source_tree;
-  source_tree.MapPath("", TestSourceDir());
-  Importer importer(&source_tree, &error_collector);
-
-  // Import (parse) unittest.proto.
-  const FileDescriptor* parsed_descriptor =
-    importer.Import("google/protobuf/unittest.proto");
-  EXPECT_EQ("", error_collector.text_);
-  ASSERT_TRUE(parsed_descriptor != NULL);
-
-  // Test that descriptors are generated correctly by converting them to
-  // FileDescriptorProtos and comparing.
-  FileDescriptorProto generated_descriptor_proto, parsed_descriptor_proto;
-  generated_descriptor->CopyTo(&generated_descriptor_proto);
-  parsed_descriptor->CopyTo(&parsed_descriptor_proto);
-
-  EXPECT_EQ(parsed_descriptor_proto.DebugString(),
-            generated_descriptor_proto.DebugString());
-}
-
-#if !defined(GOOGLE_PROTOBUF_CMAKE_BUILD) && !defined(_MSC_VER)
-// Test that generated code has proper descriptors:
-// Touch a descriptor generated from an enormous message to validate special
-// handling for descriptors exceeding the C++ standard's recommended minimum
-// limit for string literal size
-TEST(GeneratedDescriptorTest, EnormousDescriptor) {
-  const Descriptor* generated_descriptor =
-    TestEnormousDescriptor::descriptor();
-
-  EXPECT_TRUE(generated_descriptor != NULL);
-}
-#endif
-
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-
-// ===================================================================
-
-TEST(GeneratedMessageTest, Defaults) {
-  // Check that all default values are set correctly in the initial message.
-  unittest::TestAllTypes message;
-
-  TestUtil::ExpectClear(message);
-
-  // Messages should return pointers to default instances until first use.
-  // (This is not checked by ExpectClear() since it is not actually true after
-  // the fields have been set and then cleared.)
-  EXPECT_EQ(&unittest::TestAllTypes::OptionalGroup::default_instance(),
-            &message.optionalgroup());
-  EXPECT_EQ(&unittest::TestAllTypes::NestedMessage::default_instance(),
-            &message.optional_nested_message());
-  EXPECT_EQ(&unittest::ForeignMessage::default_instance(),
-            &message.optional_foreign_message());
-  EXPECT_EQ(&unittest_import::ImportMessage::default_instance(),
-            &message.optional_import_message());
-}
-
-#ifndef PROTOBUF_USE_DLLS
-TEST(GeneratedMessageTest, Int32StringConversion) {
-  EXPECT_EQ("971", Int32ToString(971));
-  EXPECT_EQ("(~0x7fffffff)", Int32ToString(kint32min));
-  EXPECT_EQ("2147483647", Int32ToString(kint32max));
-}
-
-TEST(GeneratedMessageTest, Int64StringConversion) {
-  EXPECT_EQ("GOOGLE_LONGLONG(971)", Int64ToString(971));
-  EXPECT_EQ("GOOGLE_LONGLONG(-2147483648)", Int64ToString(kint32min));
-  EXPECT_EQ("GOOGLE_LONGLONG(~0x7fffffffffffffff)", Int64ToString(kint64min));
-  EXPECT_EQ("GOOGLE_LONGLONG(9223372036854775807)", Int64ToString(kint64max));
-}
-#endif  // !PROTOBUF_USE_DLLS
-
-TEST(GeneratedMessageTest, FloatingPointDefaults) {
-  const unittest::TestExtremeDefaultValues& extreme_default =
-      unittest::TestExtremeDefaultValues::default_instance();
-
-  EXPECT_EQ(0.0f, extreme_default.zero_float());
-  EXPECT_EQ(1.0f, extreme_default.one_float());
-  EXPECT_EQ(1.5f, extreme_default.small_float());
-  EXPECT_EQ(-1.0f, extreme_default.negative_one_float());
-  EXPECT_EQ(-1.5f, extreme_default.negative_float());
-  EXPECT_EQ(2.0e8f, extreme_default.large_float());
-  EXPECT_EQ(-8e-28f, extreme_default.small_negative_float());
-  EXPECT_EQ(std::numeric_limits<double>::infinity(),
-            extreme_default.inf_double());
-  EXPECT_EQ(-std::numeric_limits<double>::infinity(),
-            extreme_default.neg_inf_double());
-  EXPECT_TRUE(extreme_default.nan_double() != extreme_default.nan_double());
-  EXPECT_EQ(std::numeric_limits<float>::infinity(),
-            extreme_default.inf_float());
-  EXPECT_EQ(-std::numeric_limits<float>::infinity(),
-            extreme_default.neg_inf_float());
-  EXPECT_TRUE(extreme_default.nan_float() != extreme_default.nan_float());
-}
-
-TEST(GeneratedMessageTest, Trigraph) {
-  const unittest::TestExtremeDefaultValues& extreme_default =
-      unittest::TestExtremeDefaultValues::default_instance();
-
-  EXPECT_EQ("? ? ?? ?? ??? ?\?/ ?\?-", extreme_default.cpp_trigraph());
-}
-
-TEST(GeneratedMessageTest, ExtremeSmallIntegerDefault) {
-  const unittest::TestExtremeDefaultValues& extreme_default =
-      unittest::TestExtremeDefaultValues::default_instance();
-  EXPECT_EQ(~0x7fffffff, kint32min);
-  EXPECT_EQ(GOOGLE_LONGLONG(~0x7fffffffffffffff), kint64min);
-  EXPECT_EQ(kint32min, extreme_default.really_small_int32());
-  EXPECT_EQ(kint64min, extreme_default.really_small_int64());
-}
-
-TEST(GeneratedMessageTest, Accessors) {
-  // Set every field to a unique value then go back and check all those
-  // values.
-  unittest::TestAllTypes message;
-
-  TestUtil::SetAllFields(&message);
-  TestUtil::ExpectAllFieldsSet(message);
-
-  TestUtil::ModifyRepeatedFields(&message);
-  TestUtil::ExpectRepeatedFieldsModified(message);
-}
-
-TEST(GeneratedMessageTest, MutableStringDefault) {
-  // mutable_foo() for a string should return a string initialized to its
-  // default value.
-  unittest::TestAllTypes message;
-
-  EXPECT_EQ("hello", *message.mutable_default_string());
-
-  // Note that the first time we call mutable_foo(), we get a newly-allocated
-  // string, but if we clear it and call it again, we get the same object again.
-  // We should verify that it has its default value in both cases.
-  message.set_default_string("blah");
-  message.Clear();
-
-  EXPECT_EQ("hello", *message.mutable_default_string());
-}
-
-TEST(GeneratedMessageTest, StringDefaults) {
-  unittest::TestExtremeDefaultValues message;
-  // Check if '\000' can be used in default string value.
-  EXPECT_EQ(string("hel\000lo", 6), message.string_with_zero());
-  EXPECT_EQ(string("wor\000ld", 6), message.bytes_with_zero());
-}
-
-TEST(GeneratedMessageTest, ReleaseString) {
-  // Check that release_foo() starts out NULL, and gives us a value
-  // that we can delete after it's been set.
-  unittest::TestAllTypes message;
-
-  EXPECT_EQ(NULL, message.release_default_string());
-  EXPECT_FALSE(message.has_default_string());
-  EXPECT_EQ("hello", message.default_string());
-
-  message.set_default_string("blah");
-  EXPECT_TRUE(message.has_default_string());
-  google::protobuf::scoped_ptr<string> str(message.release_default_string());
-  EXPECT_FALSE(message.has_default_string());
-  ASSERT_TRUE(str != NULL);
-  EXPECT_EQ("blah", *str);
-
-  EXPECT_EQ(NULL, message.release_default_string());
-  EXPECT_FALSE(message.has_default_string());
-  EXPECT_EQ("hello", message.default_string());
-}
-
-TEST(GeneratedMessageTest, ReleaseMessage) {
-  // Check that release_foo() starts out NULL, and gives us a value
-  // that we can delete after it's been set.
-  unittest::TestAllTypes message;
-
-  EXPECT_EQ(NULL, message.release_optional_nested_message());
-  EXPECT_FALSE(message.has_optional_nested_message());
-
-  message.mutable_optional_nested_message()->set_bb(1);
-  google::protobuf::scoped_ptr<unittest::TestAllTypes::NestedMessage> nest(
-      message.release_optional_nested_message());
-  EXPECT_FALSE(message.has_optional_nested_message());
-  ASSERT_TRUE(nest != NULL);
-  EXPECT_EQ(1, nest->bb());
-
-  EXPECT_EQ(NULL, message.release_optional_nested_message());
-  EXPECT_FALSE(message.has_optional_nested_message());
-}
-
-TEST(GeneratedMessageTest, SetAllocatedString) {
-  // Check that set_allocated_foo() works for strings.
-  unittest::TestAllTypes message;
-
-  EXPECT_FALSE(message.has_optional_string());
-  const string kHello("hello");
-  message.set_optional_string(kHello);
-  EXPECT_TRUE(message.has_optional_string());
-
-  message.set_allocated_optional_string(NULL);
-  EXPECT_FALSE(message.has_optional_string());
-  EXPECT_EQ("", message.optional_string());
-
-  message.set_allocated_optional_string(new string(kHello));
-  EXPECT_TRUE(message.has_optional_string());
-  EXPECT_EQ(kHello, message.optional_string());
-}
-
-TEST(GeneratedMessageTest, SetAllocatedMessage) {
-  // Check that set_allocated_foo() can be called in all cases.
-  unittest::TestAllTypes message;
-
-  EXPECT_FALSE(message.has_optional_nested_message());
-
-  message.mutable_optional_nested_message()->set_bb(1);
-  EXPECT_TRUE(message.has_optional_nested_message());
-
-  message.set_allocated_optional_nested_message(NULL);
-  EXPECT_FALSE(message.has_optional_nested_message());
-  EXPECT_EQ(&unittest::TestAllTypes::NestedMessage::default_instance(),
-            &message.optional_nested_message());
-
-  message.mutable_optional_nested_message()->set_bb(1);
-  unittest::TestAllTypes::NestedMessage* nest =
-      message.release_optional_nested_message();
-  ASSERT_TRUE(nest != NULL);
-  EXPECT_FALSE(message.has_optional_nested_message());
-
-  message.set_allocated_optional_nested_message(nest);
-  EXPECT_TRUE(message.has_optional_nested_message());
-  EXPECT_EQ(1, message.optional_nested_message().bb());
-}
-
-TEST(GeneratedMessageTest, Clear) {
-  // Set every field to a unique value, clear the message, then check that
-  // it is cleared.
-  unittest::TestAllTypes message;
-
-  TestUtil::SetAllFields(&message);
-  message.Clear();
-  TestUtil::ExpectClear(message);
-
-  // Unlike with the defaults test, we do NOT expect that requesting embedded
-  // messages will return a pointer to the default instance.  Instead, they
-  // should return the objects that were created when mutable_blah() was
-  // called.
-  EXPECT_NE(&unittest::TestAllTypes::OptionalGroup::default_instance(),
-            &message.optionalgroup());
-  EXPECT_NE(&unittest::TestAllTypes::NestedMessage::default_instance(),
-            &message.optional_nested_message());
-  EXPECT_NE(&unittest::ForeignMessage::default_instance(),
-            &message.optional_foreign_message());
-  EXPECT_NE(&unittest_import::ImportMessage::default_instance(),
-            &message.optional_import_message());
-}
-
-TEST(GeneratedMessageTest, EmbeddedNullsInBytesCharStar) {
-  unittest::TestAllTypes message;
-
-  const char* value = "\0lalala\0\0";
-  message.set_optional_bytes(value, 9);
-  ASSERT_EQ(9, message.optional_bytes().size());
-  EXPECT_EQ(0, memcmp(value, message.optional_bytes().data(), 9));
-
-  message.add_repeated_bytes(value, 9);
-  ASSERT_EQ(9, message.repeated_bytes(0).size());
-  EXPECT_EQ(0, memcmp(value, message.repeated_bytes(0).data(), 9));
-}
-
-TEST(GeneratedMessageTest, ClearOneField) {
-  // Set every field to a unique value, then clear one value and insure that
-  // only that one value is cleared.
-  unittest::TestAllTypes message;
-
-  TestUtil::SetAllFields(&message);
-  int64 original_value = message.optional_int64();
-
-  // Clear the field and make sure it shows up as cleared.
-  message.clear_optional_int64();
-  EXPECT_FALSE(message.has_optional_int64());
-  EXPECT_EQ(0, message.optional_int64());
-
-  // Other adjacent fields should not be cleared.
-  EXPECT_TRUE(message.has_optional_int32());
-  EXPECT_TRUE(message.has_optional_uint32());
-
-  // Make sure if we set it again, then all fields are set.
-  message.set_optional_int64(original_value);
-  TestUtil::ExpectAllFieldsSet(message);
-}
-
-TEST(GeneratedMessageTest, StringCharStarLength) {
-  // Verify that we can use a char*,length to set one of the string fields.
-  unittest::TestAllTypes message;
-  message.set_optional_string("abcdef", 3);
-  EXPECT_EQ("abc", message.optional_string());
-
-  // Verify that we can use a char*,length to add to a repeated string field.
-  message.add_repeated_string("abcdef", 3);
-  EXPECT_EQ(1, message.repeated_string_size());
-  EXPECT_EQ("abc", message.repeated_string(0));
-
-  // Verify that we can use a char*,length to set a repeated string field.
-  message.set_repeated_string(0, "wxyz", 2);
-  EXPECT_EQ("wx", message.repeated_string(0));
-}
-
-#if LANG_CXX11
-TEST(GeneratedMessageTest, StringMove) {
-  // Verify that we trigger the move behavior on a scalar setter.
-  protobuf_unittest_no_arena::TestAllTypes message;
-  {
-    string tmp(32, 'a');
-
-    const char* old_data = tmp.data();
-    message.set_optional_string(std::move(tmp));
-    const char* new_data = message.optional_string().data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'a'), message.optional_string());
-
-    string tmp2(32, 'b');
-    old_data = tmp2.data();
-    message.set_optional_string(std::move(tmp2));
-    new_data = message.optional_string().data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'b'), message.optional_string());
-  }
-
-  // Verify that we trigger the move behavior on a oneof setter.
-  {
-    string tmp(32, 'a');
-
-    const char* old_data = tmp.data();
-    message.set_oneof_string(std::move(tmp));
-    const char* new_data = message.oneof_string().data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'a'), message.oneof_string());
-
-    string tmp2(32, 'b');
-    old_data = tmp2.data();
-    message.set_oneof_string(std::move(tmp2));
-    new_data = message.oneof_string().data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'b'), message.oneof_string());
-  }
-
-  // Verify that we trigger the move behavior on a repeated setter.
-  {
-    string tmp(32, 'a');
-
-    const char* old_data = tmp.data();
-    message.add_repeated_string(std::move(tmp));
-    const char* new_data = message.repeated_string(0).data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'a'), message.repeated_string(0));
-
-    string tmp2(32, 'b');
-    old_data = tmp2.data();
-    message.set_repeated_string(0, std::move(tmp2));
-    new_data = message.repeated_string(0).data();
-
-    EXPECT_EQ(old_data, new_data);
-    EXPECT_EQ(string(32, 'b'), message.repeated_string(0));
-  }
-}
-#endif
-
-
-TEST(GeneratedMessageTest, CopyFrom) {
-  unittest::TestAllTypes message1, message2;
-
-  TestUtil::SetAllFields(&message1);
-  message2.CopyFrom(message1);
-  TestUtil::ExpectAllFieldsSet(message2);
-
-  // Copying from self should be a no-op.
-  message2.CopyFrom(message2);
-  TestUtil::ExpectAllFieldsSet(message2);
-}
-
-
-TEST(GeneratedMessageTest, SwapWithEmpty) {
-  unittest::TestAllTypes message1, message2;
-  TestUtil::SetAllFields(&message1);
-
-  TestUtil::ExpectAllFieldsSet(message1);
-  TestUtil::ExpectClear(message2);
-  message1.Swap(&message2);
-  TestUtil::ExpectAllFieldsSet(message2);
-  TestUtil::ExpectClear(message1);
-}
-
-TEST(GeneratedMessageTest, SwapWithSelf) {
-  unittest::TestAllTypes message;
-  TestUtil::SetAllFields(&message);
-  TestUtil::ExpectAllFieldsSet(message);
-  message.Swap(&message);
-  TestUtil::ExpectAllFieldsSet(message);
-}
-
-TEST(GeneratedMessageTest, SwapWithOther) {
-  unittest::TestAllTypes message1, message2;
-
-  message1.set_optional_int32(123);
-  message1.set_optional_string("abc");
-  message1.mutable_optional_nested_message()->set_bb(1);
-  message1.set_optional_nested_enum(unittest::TestAllTypes::FOO);
-  message1.add_repeated_int32(1);
-  message1.add_repeated_int32(2);
-  message1.add_repeated_string("a");
-  message1.add_repeated_string("b");
-  message1.add_repeated_nested_message()->set_bb(7);
-  message1.add_repeated_nested_message()->set_bb(8);
-  message1.add_repeated_nested_enum(unittest::TestAllTypes::FOO);
-  message1.add_repeated_nested_enum(unittest::TestAllTypes::BAR);
-
-  message2.set_optional_int32(456);
-  message2.set_optional_string("def");
-  message2.mutable_optional_nested_message()->set_bb(2);
-  message2.set_optional_nested_enum(unittest::TestAllTypes::BAR);
-  message2.add_repeated_int32(3);
-  message2.add_repeated_string("c");
-  message2.add_repeated_nested_message()->set_bb(9);
-  message2.add_repeated_nested_enum(unittest::TestAllTypes::BAZ);
-
-  message1.Swap(&message2);
-
-  EXPECT_EQ(456, message1.optional_int32());
-  EXPECT_EQ("def", message1.optional_string());
-  EXPECT_EQ(2, message1.optional_nested_message().bb());
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message1.optional_nested_enum());
-  ASSERT_EQ(1, message1.repeated_int32_size());
-  EXPECT_EQ(3, message1.repeated_int32(0));
-  ASSERT_EQ(1, message1.repeated_string_size());
-  EXPECT_EQ("c", message1.repeated_string(0));
-  ASSERT_EQ(1, message1.repeated_nested_message_size());
-  EXPECT_EQ(9, message1.repeated_nested_message(0).bb());
-  ASSERT_EQ(1, message1.repeated_nested_enum_size());
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message1.repeated_nested_enum(0));
-
-  EXPECT_EQ(123, message2.optional_int32());
-  EXPECT_EQ("abc", message2.optional_string());
-  EXPECT_EQ(1, message2.optional_nested_message().bb());
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message2.optional_nested_enum());
-  ASSERT_EQ(2, message2.repeated_int32_size());
-  EXPECT_EQ(1, message2.repeated_int32(0));
-  EXPECT_EQ(2, message2.repeated_int32(1));
-  ASSERT_EQ(2, message2.repeated_string_size());
-  EXPECT_EQ("a", message2.repeated_string(0));
-  EXPECT_EQ("b", message2.repeated_string(1));
-  ASSERT_EQ(2, message2.repeated_nested_message_size());
-  EXPECT_EQ(7, message2.repeated_nested_message(0).bb());
-  EXPECT_EQ(8, message2.repeated_nested_message(1).bb());
-  ASSERT_EQ(2, message2.repeated_nested_enum_size());
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message2.repeated_nested_enum(0));
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message2.repeated_nested_enum(1));
-}
-
-TEST(GeneratedMessageTest, CopyConstructor) {
-  unittest::TestAllTypes message1;
-  TestUtil::SetAllFields(&message1);
-
-  unittest::TestAllTypes message2(message1);
-  TestUtil::ExpectAllFieldsSet(message2);
-}
-
-TEST(GeneratedMessageTest, CopyConstructorWithArenas) {
-  Arena arena;
-  unittest::TestAllTypes* message1 =
-      Arena::CreateMessage<unittest::TestAllTypes>(&arena);
-  TestUtil::SetAllFields(message1);
-
-  unittest::TestAllTypes message2_stack(*message1);
-  TestUtil::ExpectAllFieldsSet(message2_stack);
-
-  google::protobuf::scoped_ptr<unittest::TestAllTypes> message2_heap(
-      new unittest::TestAllTypes(*message1));
-  TestUtil::ExpectAllFieldsSet(*message2_heap);
-
-  arena.Reset();
-
-  // Verify that the copies are still intact.
-  TestUtil::ExpectAllFieldsSet(message2_stack);
-  TestUtil::ExpectAllFieldsSet(*message2_heap);
-}
-
-TEST(GeneratedMessageTest, CopyAssignmentOperator) {
-  unittest::TestAllTypes message1;
-  TestUtil::SetAllFields(&message1);
-
-  unittest::TestAllTypes message2;
-  message2 = message1;
-  TestUtil::ExpectAllFieldsSet(message2);
-
-  // Make sure that self-assignment does something sane.
-  message2.operator=(message2);
-  TestUtil::ExpectAllFieldsSet(message2);
-}
-
-#if !defined(PROTOBUF_TEST_NO_DESCRIPTORS) || \
-    !defined(GOOGLE_PROTOBUF_NO_RTTI)
-TEST(GeneratedMessageTest, UpcastCopyFrom) {
-  // Test the CopyFrom method that takes in the generic const Message&
-  // parameter.
-  unittest::TestAllTypes message1, message2;
-
-  TestUtil::SetAllFields(&message1);
-
-  const Message* source = implicit_cast<const Message*>(&message1);
-  message2.CopyFrom(*source);
-
-  TestUtil::ExpectAllFieldsSet(message2);
-}
-#endif
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-
-TEST(GeneratedMessageTest, DynamicMessageCopyFrom) {
-  // Test copying from a DynamicMessage, which must fall back to using
-  // reflection.
-  unittest::TestAllTypes message2;
-
-  // Construct a new version of the dynamic message via the factory.
-  DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message1;
-  message1.reset(factory.GetPrototype(
-                     unittest::TestAllTypes::descriptor())->New());
-
-  TestUtil::ReflectionTester reflection_tester(
-    unittest::TestAllTypes::descriptor());
-  reflection_tester.SetAllFieldsViaReflection(message1.get());
-
-  message2.CopyFrom(*message1);
-
-  TestUtil::ExpectAllFieldsSet(message2);
-}
-
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-
-TEST(GeneratedMessageTest, NonEmptyMergeFrom) {
-  // Test merging with a non-empty message. Code is a modified form
-  // of that found in google/protobuf/reflection_ops_unittest.cc.
-  unittest::TestAllTypes message1, message2;
-
-  TestUtil::SetAllFields(&message1);
-
-  // This field will test merging into an empty spot.
-  message2.set_optional_int32(message1.optional_int32());
-  message1.clear_optional_int32();
-
-  // This tests overwriting.
-  message2.set_optional_string(message1.optional_string());
-  message1.set_optional_string("something else");
-
-  // This tests concatenating.
-  message2.add_repeated_int32(message1.repeated_int32(1));
-  int32 i = message1.repeated_int32(0);
-  message1.clear_repeated_int32();
-  message1.add_repeated_int32(i);
-
-  message1.MergeFrom(message2);
-
-  TestUtil::ExpectAllFieldsSet(message1);
-}
-
-#if !defined(PROTOBUF_TEST_NO_DESCRIPTORS) || \
-    !defined(GOOGLE_PROTOBUF_NO_RTTI)
-#ifdef PROTOBUF_HAS_DEATH_TEST
-#ifndef NDEBUG
-
-TEST(GeneratedMessageTest, MergeFromSelf) {
-  unittest::TestAllTypes message;
-  EXPECT_DEATH(message.MergeFrom(message), "pb[.]cc.*Check failed:");
-  EXPECT_DEATH(message.MergeFrom(implicit_cast<const Message&>(message)),
-               "pb[.]cc.*Check failed:");
-}
-
-#endif  // NDEBUG
-#endif  // PROTOBUF_HAS_DEATH_TEST
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS || !GOOGLE_PROTOBUF_NO_RTTI
-
-// Test the generated SerializeWithCachedSizesToArray(),
-TEST(GeneratedMessageTest, SerializationToArray) {
-  unittest::TestAllTypes message1, message2;
-  string data;
-  TestUtil::SetAllFields(&message1);
-  int size = message1.ByteSize();
-  data.resize(size);
-  uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-  uint8* end = message1.SerializeWithCachedSizesToArray(start);
-  EXPECT_EQ(size, end - start);
-  EXPECT_TRUE(message2.ParseFromString(data));
-  TestUtil::ExpectAllFieldsSet(message2);
-
-}
-
-TEST(GeneratedMessageTest, PackedFieldsSerializationToArray) {
-  unittest::TestPackedTypes packed_message1, packed_message2;
-  string packed_data;
-  TestUtil::SetPackedFields(&packed_message1);
-  int packed_size = packed_message1.ByteSize();
-  packed_data.resize(packed_size);
-  uint8* start = reinterpret_cast<uint8*>(string_as_array(&packed_data));
-  uint8* end = packed_message1.SerializeWithCachedSizesToArray(start);
-  EXPECT_EQ(packed_size, end - start);
-  EXPECT_TRUE(packed_message2.ParseFromString(packed_data));
-  TestUtil::ExpectPackedFieldsSet(packed_message2);
-}
-
-// Test the generated SerializeWithCachedSizes() by forcing the buffer to write
-// one byte at a time.
-TEST(GeneratedMessageTest, SerializationToStream) {
-  unittest::TestAllTypes message1, message2;
-  TestUtil::SetAllFields(&message1);
-  int size = message1.ByteSize();
-  string data;
-  data.resize(size);
-  {
-    // Allow the output stream to buffer only one byte at a time.
-    io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-    io::CodedOutputStream output_stream(&array_stream);
-    message1.SerializeWithCachedSizes(&output_stream);
-    EXPECT_FALSE(output_stream.HadError());
-    EXPECT_EQ(size, output_stream.ByteCount());
-  }
-  EXPECT_TRUE(message2.ParseFromString(data));
-  TestUtil::ExpectAllFieldsSet(message2);
-
-}
-
-TEST(GeneratedMessageTest, PackedFieldsSerializationToStream) {
-  unittest::TestPackedTypes message1, message2;
-  TestUtil::SetPackedFields(&message1);
-  int size = message1.ByteSize();
-  string data;
-  data.resize(size);
-  {
-    // Allow the output stream to buffer only one byte at a time.
-    io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-    io::CodedOutputStream output_stream(&array_stream);
-    message1.SerializeWithCachedSizes(&output_stream);
-    EXPECT_FALSE(output_stream.HadError());
-    EXPECT_EQ(size, output_stream.ByteCount());
-  }
-  EXPECT_TRUE(message2.ParseFromString(data));
-  TestUtil::ExpectPackedFieldsSet(message2);
-}
-
-
-TEST(GeneratedMessageTest, Required) {
-  // Test that IsInitialized() returns false if required fields are missing.
-  unittest::TestRequired message;
-
-  EXPECT_FALSE(message.IsInitialized());
-  message.set_a(1);
-  EXPECT_FALSE(message.IsInitialized());
-  message.set_b(2);
-  EXPECT_FALSE(message.IsInitialized());
-  message.set_c(3);
-  EXPECT_TRUE(message.IsInitialized());
-}
-
-TEST(GeneratedMessageTest, RequiredForeign) {
-  // Test that IsInitialized() returns false if required fields in nested
-  // messages are missing.
-  unittest::TestRequiredForeign message;
-
-  EXPECT_TRUE(message.IsInitialized());
-
-  message.mutable_optional_message();
-  EXPECT_FALSE(message.IsInitialized());
-
-  message.mutable_optional_message()->set_a(1);
-  message.mutable_optional_message()->set_b(2);
-  message.mutable_optional_message()->set_c(3);
-  EXPECT_TRUE(message.IsInitialized());
-
-  message.add_repeated_message();
-  EXPECT_FALSE(message.IsInitialized());
-
-  message.mutable_repeated_message(0)->set_a(1);
-  message.mutable_repeated_message(0)->set_b(2);
-  message.mutable_repeated_message(0)->set_c(3);
-  EXPECT_TRUE(message.IsInitialized());
-}
-
-TEST(GeneratedMessageTest, ForeignNested) {
-  // Test that TestAllTypes::NestedMessage can be embedded directly into
-  // another message.
-  unittest::TestForeignNested message;
-
-  // If this compiles and runs without crashing, it must work.  We have
-  // nothing more to test.
-  unittest::TestAllTypes::NestedMessage* nested =
-    message.mutable_foreign_nested();
-  nested->set_bb(1);
-}
-
-TEST(GeneratedMessageTest, ReallyLargeTagNumber) {
-  // Test that really large tag numbers don't break anything.
-  unittest::TestReallyLargeTagNumber message1, message2;
-  string data;
-
-  // For the most part, if this compiles and runs then we're probably good.
-  // (The most likely cause for failure would be if something were attempting
-  // to allocate a lookup table of some sort using tag numbers as the index.)
-  // We'll try serializing just for fun.
-  message1.set_a(1234);
-  message1.set_bb(5678);
-  message1.SerializeToString(&data);
-  EXPECT_TRUE(message2.ParseFromString(data));
-  EXPECT_EQ(1234, message2.a());
-  EXPECT_EQ(5678, message2.bb());
-}
-
-TEST(GeneratedMessageTest, MutualRecursion) {
-  // Test that mutually-recursive message types work.
-  unittest::TestMutualRecursionA message;
-  unittest::TestMutualRecursionA* nested = message.mutable_bb()->mutable_a();
-  unittest::TestMutualRecursionA* nested2 = nested->mutable_bb()->mutable_a();
-
-  // Again, if the above compiles and runs, that's all we really have to
-  // test, but just for run we'll check that the system didn't somehow come
-  // up with a pointer loop...
-  EXPECT_NE(&message, nested);
-  EXPECT_NE(&message, nested2);
-  EXPECT_NE(nested, nested2);
-}
-
-TEST(GeneratedMessageTest, CamelCaseFieldNames) {
-  // This test is mainly checking that the following compiles, which verifies
-  // that the field names were coerced to lower-case.
-  //
-  // Protocol buffers standard style is to use lowercase-with-underscores for
-  // field names.  Some old proto1 .protos unfortunately used camel-case field
-  // names.  In proto1, these names were forced to lower-case.  So, we do the
-  // same thing in proto2.
-
-  unittest::TestCamelCaseFieldNames message;
-
-  message.set_primitivefield(2);
-  message.set_stringfield("foo");
-  message.set_enumfield(unittest::FOREIGN_FOO);
-  message.mutable_messagefield()->set_c(6);
-
-  message.add_repeatedprimitivefield(8);
-  message.add_repeatedstringfield("qux");
-  message.add_repeatedenumfield(unittest::FOREIGN_BAR);
-  message.add_repeatedmessagefield()->set_c(15);
-
-  EXPECT_EQ(2, message.primitivefield());
-  EXPECT_EQ("foo", message.stringfield());
-  EXPECT_EQ(unittest::FOREIGN_FOO, message.enumfield());
-  EXPECT_EQ(6, message.messagefield().c());
-
-  EXPECT_EQ(8, message.repeatedprimitivefield(0));
-  EXPECT_EQ("qux", message.repeatedstringfield(0));
-  EXPECT_EQ(unittest::FOREIGN_BAR, message.repeatedenumfield(0));
-  EXPECT_EQ(15, message.repeatedmessagefield(0).c());
-}
-
-TEST(GeneratedMessageTest, TestConflictingSymbolNames) {
+TEST(GENERATED_MESSAGE_TEST_NAME, TestConflictingSymbolNames) {
   // test_bad_identifiers.proto successfully compiled, then it works.  The
   // following is just a token usage to insure that the code is, in fact,
   // being compiled and linked.
 
   protobuf_unittest::TestConflictingSymbolNames message;
   message.set_uint32(1);
-  EXPECT_EQ(3, message.ByteSize());
+  EXPECT_EQ(3, message.ByteSizeLong());
 
   message.set_friend_(5);
   EXPECT_EQ(5, message.friend_());
@@ -903,7 +100,7 @@ TEST(GeneratedMessageTest, TestConflictingSymbolNames) {
             message.GetExtension(ExtensionMessage::repeated_int32_ext, 0));
 }
 
-TEST(GeneratedMessageTest, TestConflictingEnumNames) {
+TEST(GENERATED_MESSAGE_TEST_NAME, TestConflictingEnumNames) {
   protobuf_unittest::TestConflictingEnumNames message;
   message.set_conflicting_enum(protobuf_unittest::TestConflictingEnumNames_NestedConflictingEnum_and_);
   EXPECT_EQ(1, message.conflicting_enum());
@@ -918,1311 +115,8 @@ TEST(GeneratedMessageTest, TestConflictingEnumNames) {
   EXPECT_EQ(3, conflicting_enum);
 }
 
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-
-TEST(GeneratedMessageTest, TestOptimizedForSize) {
-  // We rely on the tests in reflection_ops_unittest and wire_format_unittest
-  // to really test that reflection-based methods work.  Here we are mostly
-  // just making sure that TestOptimizedForSize actually builds and seems to
-  // function.
-
-  protobuf_unittest::TestOptimizedForSize message, message2;
-  message.set_i(1);
-  message.mutable_msg()->set_c(2);
-  message2.CopyFrom(message);
-  EXPECT_EQ(1, message2.i());
-  EXPECT_EQ(2, message2.msg().c());
-}
-
-TEST(GeneratedMessageTest, TestEmbedOptimizedForSize) {
-  // Verifies that something optimized for speed can contain something optimized
-  // for size.
-
-  protobuf_unittest::TestEmbedOptimizedForSize message, message2;
-  message.mutable_optional_message()->set_i(1);
-  message.add_repeated_message()->mutable_msg()->set_c(2);
-  string data;
-  message.SerializeToString(&data);
-  ASSERT_TRUE(message2.ParseFromString(data));
-  EXPECT_EQ(1, message2.optional_message().i());
-  EXPECT_EQ(2, message2.repeated_message(0).msg().c());
-}
-
-TEST(GeneratedMessageTest, TestSpaceUsed) {
-  unittest::TestAllTypes message1;
-  // sizeof provides a lower bound on SpaceUsed().
-  EXPECT_LE(sizeof(unittest::TestAllTypes), message1.SpaceUsed());
-  const int empty_message_size = message1.SpaceUsed();
-
-  // Setting primitive types shouldn't affect the space used.
-  message1.set_optional_int32(123);
-  message1.set_optional_int64(12345);
-  message1.set_optional_uint32(123);
-  message1.set_optional_uint64(12345);
-  EXPECT_EQ(empty_message_size, message1.SpaceUsed());
-
-  // On some STL implementations, setting the string to a small value should
-  // only increase SpaceUsed() by the size of a string object, though this is
-  // not true everywhere.
-  message1.set_optional_string("abc");
-  EXPECT_LE(empty_message_size + sizeof(string), message1.SpaceUsed());
-
-  // Setting a string to a value larger than the string object itself should
-  // increase SpaceUsed(), because it cannot store the value internally.
-  message1.set_optional_string(string(sizeof(string) + 1, 'x'));
-  int min_expected_increase = message1.optional_string().capacity() +
-      sizeof(string);
-  EXPECT_LE(empty_message_size + min_expected_increase,
-            message1.SpaceUsed());
-
-  int previous_size = message1.SpaceUsed();
-  // Adding an optional message should increase the size by the size of the
-  // nested message type. NestedMessage is simple enough (1 int field) that it
-  // is equal to sizeof(NestedMessage)
-  message1.mutable_optional_nested_message();
-  ASSERT_EQ(sizeof(unittest::TestAllTypes::NestedMessage),
-            message1.optional_nested_message().SpaceUsed());
-  EXPECT_EQ(previous_size +
-            sizeof(unittest::TestAllTypes::NestedMessage),
-            message1.SpaceUsed());
-}
-
-TEST(GeneratedMessageTest, TestOneofSpaceUsed) {
-  unittest::TestOneof2 message1;
-  EXPECT_LE(sizeof(unittest::TestOneof2), message1.SpaceUsed());
-
-  const int empty_message_size = message1.SpaceUsed();
-  // Setting primitive types shouldn't affect the space used.
-  message1.set_foo_int(123);
-  message1.set_bar_int(12345);
-  EXPECT_EQ(empty_message_size, message1.SpaceUsed());
-
-  // Setting a string in oneof to a small value should only increase SpaceUsed()
-  // by the size of a string object.
-  message1.set_foo_string("abc");
-  EXPECT_LE(empty_message_size + sizeof(string), message1.SpaceUsed());
-
-  // Setting a string in oneof to a value larger than the string object itself
-  // should increase SpaceUsed(), because it cannot store the value internally.
-  message1.set_foo_string(string(sizeof(string) + 1, 'x'));
-  int min_expected_increase = message1.foo_string().capacity() +
-      sizeof(string);
-  EXPECT_LE(empty_message_size + min_expected_increase,
-            message1.SpaceUsed());
-
-  // Setting a message in oneof should delete the other fields and increase the
-  // size by the size of the nested message type. NestedMessage is simple enough
-  // that it is equal to sizeof(NestedMessage)
-  message1.mutable_foo_message();
-  ASSERT_EQ(sizeof(unittest::TestOneof2::NestedMessage),
-            message1.foo_message().SpaceUsed());
-  EXPECT_EQ(empty_message_size +
-            sizeof(unittest::TestOneof2::NestedMessage),
-            message1.SpaceUsed());
-}
-
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-
-
-TEST(GeneratedMessageTest, FieldConstantValues) {
-  unittest::TestRequired message;
-  EXPECT_EQ(unittest::TestAllTypes_NestedMessage::kBbFieldNumber, 1);
-  EXPECT_EQ(unittest::TestAllTypes::kOptionalInt32FieldNumber, 1);
-  EXPECT_EQ(unittest::TestAllTypes::kOptionalgroupFieldNumber, 16);
-  EXPECT_EQ(unittest::TestAllTypes::kOptionalNestedMessageFieldNumber, 18);
-  EXPECT_EQ(unittest::TestAllTypes::kOptionalNestedEnumFieldNumber, 21);
-  EXPECT_EQ(unittest::TestAllTypes::kRepeatedInt32FieldNumber, 31);
-  EXPECT_EQ(unittest::TestAllTypes::kRepeatedgroupFieldNumber, 46);
-  EXPECT_EQ(unittest::TestAllTypes::kRepeatedNestedMessageFieldNumber, 48);
-  EXPECT_EQ(unittest::TestAllTypes::kRepeatedNestedEnumFieldNumber, 51);
-}
-
-TEST(GeneratedMessageTest, ExtensionConstantValues) {
-  EXPECT_EQ(unittest::TestRequired::kSingleFieldNumber, 1000);
-  EXPECT_EQ(unittest::TestRequired::kMultiFieldNumber, 1001);
-  EXPECT_EQ(unittest::kOptionalInt32ExtensionFieldNumber, 1);
-  EXPECT_EQ(unittest::kOptionalgroupExtensionFieldNumber, 16);
-  EXPECT_EQ(unittest::kOptionalNestedMessageExtensionFieldNumber, 18);
-  EXPECT_EQ(unittest::kOptionalNestedEnumExtensionFieldNumber, 21);
-  EXPECT_EQ(unittest::kRepeatedInt32ExtensionFieldNumber, 31);
-  EXPECT_EQ(unittest::kRepeatedgroupExtensionFieldNumber, 46);
-  EXPECT_EQ(unittest::kRepeatedNestedMessageExtensionFieldNumber, 48);
-  EXPECT_EQ(unittest::kRepeatedNestedEnumExtensionFieldNumber, 51);
-}
-
-TEST(GeneratedMessageTest, ParseFromTruncated) {
-  const string long_string = string(128, 'q');
-  FileDescriptorProto p;
-  p.add_extension()->set_name(long_string);
-  const string msg = p.SerializeAsString();
-  int successful_count = 0;
-  for (int i = 0; i <= msg.size(); i++) {
-    if (p.ParseFromArray(msg.c_str(), i)) {
-      ++successful_count;
-    }
-  }
-  // We don't really care about how often we succeeded.
-  // As long as we didn't crash, we're happy.
-  EXPECT_GE(successful_count, 1);
-}
-
-// ===================================================================
-
-TEST(GeneratedEnumTest, EnumValuesAsSwitchCases) {
-  // Test that our nested enum values can be used as switch cases.  This test
-  // doesn't actually do anything, the proof that it works is that it
-  // compiles.
-  int i =0;
-  unittest::TestAllTypes::NestedEnum a = unittest::TestAllTypes::BAR;
-  switch (a) {
-    case unittest::TestAllTypes::FOO:
-      i = 1;
-      break;
-    case unittest::TestAllTypes::BAR:
-      i = 2;
-      break;
-    case unittest::TestAllTypes::BAZ:
-      i = 3;
-      break;
-    case unittest::TestAllTypes::NEG:
-      i = -1;
-      break;
-    // no default case:  We want to make sure the compiler recognizes that
-    //   all cases are covered.  (GCC warns if you do not cover all cases of
-    //   an enum in a switch.)
-  }
-
-  // Token check just for fun.
-  EXPECT_EQ(2, i);
-}
-
-TEST(GeneratedEnumTest, IsValidValue) {
-  // Test enum IsValidValue.
-  EXPECT_TRUE(unittest::TestAllTypes::NestedEnum_IsValid(1));
-  EXPECT_TRUE(unittest::TestAllTypes::NestedEnum_IsValid(2));
-  EXPECT_TRUE(unittest::TestAllTypes::NestedEnum_IsValid(3));
-
-  EXPECT_FALSE(unittest::TestAllTypes::NestedEnum_IsValid(0));
-  EXPECT_FALSE(unittest::TestAllTypes::NestedEnum_IsValid(4));
-
-  // Make sure it also works when there are dups.
-  EXPECT_TRUE(unittest::TestEnumWithDupValue_IsValid(1));
-  EXPECT_TRUE(unittest::TestEnumWithDupValue_IsValid(2));
-  EXPECT_TRUE(unittest::TestEnumWithDupValue_IsValid(3));
-
-  EXPECT_FALSE(unittest::TestEnumWithDupValue_IsValid(0));
-  EXPECT_FALSE(unittest::TestEnumWithDupValue_IsValid(4));
-}
-
-TEST(GeneratedEnumTest, MinAndMax) {
-  EXPECT_EQ(unittest::TestAllTypes::NEG,
-            unittest::TestAllTypes::NestedEnum_MIN);
-  EXPECT_EQ(unittest::TestAllTypes::BAZ,
-            unittest::TestAllTypes::NestedEnum_MAX);
-  EXPECT_EQ(4, unittest::TestAllTypes::NestedEnum_ARRAYSIZE);
-
-  EXPECT_EQ(unittest::FOREIGN_FOO, unittest::ForeignEnum_MIN);
-  EXPECT_EQ(unittest::FOREIGN_BAZ, unittest::ForeignEnum_MAX);
-  EXPECT_EQ(7, unittest::ForeignEnum_ARRAYSIZE);
-
-  EXPECT_EQ(1, unittest::TestEnumWithDupValue_MIN);
-  EXPECT_EQ(3, unittest::TestEnumWithDupValue_MAX);
-  EXPECT_EQ(4, unittest::TestEnumWithDupValue_ARRAYSIZE);
-
-  EXPECT_EQ(unittest::SPARSE_E, unittest::TestSparseEnum_MIN);
-  EXPECT_EQ(unittest::SPARSE_C, unittest::TestSparseEnum_MAX);
-  EXPECT_EQ(12589235, unittest::TestSparseEnum_ARRAYSIZE);
-
-  // Make sure we can take the address of _MIN, _MAX and _ARRAYSIZE.
-  void* null_pointer = 0;  // NULL may be integer-type, not pointer-type.
-  EXPECT_NE(null_pointer, &unittest::TestAllTypes::NestedEnum_MIN);
-  EXPECT_NE(null_pointer, &unittest::TestAllTypes::NestedEnum_MAX);
-  EXPECT_NE(null_pointer, &unittest::TestAllTypes::NestedEnum_ARRAYSIZE);
-
-  EXPECT_NE(null_pointer, &unittest::ForeignEnum_MIN);
-  EXPECT_NE(null_pointer, &unittest::ForeignEnum_MAX);
-  EXPECT_NE(null_pointer, &unittest::ForeignEnum_ARRAYSIZE);
-
-  // Make sure we can use _MIN and _MAX as switch cases.
-  switch (unittest::SPARSE_A) {
-    case unittest::TestSparseEnum_MIN:
-    case unittest::TestSparseEnum_MAX:
-      break;
-    default:
-      break;
-  }
-}
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-
-TEST(GeneratedEnumTest, Name) {
-  // "Names" in the presence of dup values are a bit arbitrary.
-  EXPECT_EQ("FOO1", unittest::TestEnumWithDupValue_Name(unittest::FOO1));
-  EXPECT_EQ("FOO1", unittest::TestEnumWithDupValue_Name(unittest::FOO2));
-
-  EXPECT_EQ("SPARSE_A", unittest::TestSparseEnum_Name(unittest::SPARSE_A));
-  EXPECT_EQ("SPARSE_B", unittest::TestSparseEnum_Name(unittest::SPARSE_B));
-  EXPECT_EQ("SPARSE_C", unittest::TestSparseEnum_Name(unittest::SPARSE_C));
-  EXPECT_EQ("SPARSE_D", unittest::TestSparseEnum_Name(unittest::SPARSE_D));
-  EXPECT_EQ("SPARSE_E", unittest::TestSparseEnum_Name(unittest::SPARSE_E));
-  EXPECT_EQ("SPARSE_F", unittest::TestSparseEnum_Name(unittest::SPARSE_F));
-  EXPECT_EQ("SPARSE_G", unittest::TestSparseEnum_Name(unittest::SPARSE_G));
-}
-
-TEST(GeneratedEnumTest, Parse) {
-  unittest::TestEnumWithDupValue dup_value = unittest::FOO1;
-  EXPECT_TRUE(unittest::TestEnumWithDupValue_Parse("FOO1", &dup_value));
-  EXPECT_EQ(unittest::FOO1, dup_value);
-  EXPECT_TRUE(unittest::TestEnumWithDupValue_Parse("FOO2", &dup_value));
-  EXPECT_EQ(unittest::FOO2, dup_value);
-  EXPECT_FALSE(unittest::TestEnumWithDupValue_Parse("FOO", &dup_value));
-}
-
-TEST(GeneratedEnumTest, GetEnumDescriptor) {
-  EXPECT_EQ(unittest::TestAllTypes::NestedEnum_descriptor(),
-            GetEnumDescriptor<unittest::TestAllTypes::NestedEnum>());
-  EXPECT_EQ(unittest::ForeignEnum_descriptor(),
-            GetEnumDescriptor<unittest::ForeignEnum>());
-  EXPECT_EQ(unittest::TestEnumWithDupValue_descriptor(),
-            GetEnumDescriptor<unittest::TestEnumWithDupValue>());
-  EXPECT_EQ(unittest::TestSparseEnum_descriptor(),
-            GetEnumDescriptor<unittest::TestSparseEnum>());
-}
-
-enum NonProtoEnum {
-  kFoo = 1,
-};
-
-TEST(GeneratedEnumTest, IsProtoEnumTypeTrait) {
-  EXPECT_TRUE(is_proto_enum<unittest::TestAllTypes::NestedEnum>::value);
-  EXPECT_TRUE(is_proto_enum<unittest::ForeignEnum>::value);
-  EXPECT_TRUE(is_proto_enum<unittest::TestEnumWithDupValue>::value);
-  EXPECT_TRUE(is_proto_enum<unittest::TestSparseEnum>::value);
-
-  EXPECT_FALSE(is_proto_enum<int>::value);
-  EXPECT_FALSE(is_proto_enum<NonProtoEnum>::value);
-}
-
-#endif  // PROTOBUF_TEST_NO_DESCRIPTORS
-
-// ===================================================================
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-
-// Support code for testing services.
-class GeneratedServiceTest : public testing::Test {
- protected:
-  class MockTestService : public unittest::TestService {
-   public:
-    MockTestService()
-      : called_(false),
-        method_(""),
-        controller_(NULL),
-        request_(NULL),
-        response_(NULL),
-        done_(NULL) {}
-
-    ~MockTestService() {}
-
-    void Reset() { called_ = false; }
-
-    // implements TestService ----------------------------------------
-
-    void Foo(RpcController* controller,
-             const unittest::FooRequest* request,
-             unittest::FooResponse* response,
-             Closure* done) {
-      ASSERT_FALSE(called_);
-      called_ = true;
-      method_ = "Foo";
-      controller_ = controller;
-      request_ = request;
-      response_ = response;
-      done_ = done;
-    }
-
-    void Bar(RpcController* controller,
-             const unittest::BarRequest* request,
-             unittest::BarResponse* response,
-             Closure* done) {
-      ASSERT_FALSE(called_);
-      called_ = true;
-      method_ = "Bar";
-      controller_ = controller;
-      request_ = request;
-      response_ = response;
-      done_ = done;
-    }
-
-    // ---------------------------------------------------------------
-
-    bool called_;
-    string method_;
-    RpcController* controller_;
-    const Message* request_;
-    Message* response_;
-    Closure* done_;
-  };
-
-  class MockRpcChannel : public RpcChannel {
-   public:
-    MockRpcChannel()
-      : called_(false),
-        method_(NULL),
-        controller_(NULL),
-        request_(NULL),
-        response_(NULL),
-        done_(NULL),
-        destroyed_(NULL) {}
-
-    ~MockRpcChannel() {
-      if (destroyed_ != NULL) *destroyed_ = true;
-    }
-
-    void Reset() { called_ = false; }
-
-    // implements TestService ----------------------------------------
-
-    void CallMethod(const MethodDescriptor* method,
-                    RpcController* controller,
-                    const Message* request,
-                    Message* response,
-                    Closure* done) {
-      ASSERT_FALSE(called_);
-      called_ = true;
-      method_ = method;
-      controller_ = controller;
-      request_ = request;
-      response_ = response;
-      done_ = done;
-    }
-
-    // ---------------------------------------------------------------
-
-    bool called_;
-    const MethodDescriptor* method_;
-    RpcController* controller_;
-    const Message* request_;
-    Message* response_;
-    Closure* done_;
-    bool* destroyed_;
-  };
-
-  class MockController : public RpcController {
-   public:
-    void Reset() {
-      ADD_FAILURE() << "Reset() not expected during this test.";
-    }
-    bool Failed() const {
-      ADD_FAILURE() << "Failed() not expected during this test.";
-      return false;
-    }
-    string ErrorText() const {
-      ADD_FAILURE() << "ErrorText() not expected during this test.";
-      return "";
-    }
-    void StartCancel() {
-      ADD_FAILURE() << "StartCancel() not expected during this test.";
-    }
-    void SetFailed(const string& reason) {
-      ADD_FAILURE() << "SetFailed() not expected during this test.";
-    }
-    bool IsCanceled() const {
-      ADD_FAILURE() << "IsCanceled() not expected during this test.";
-      return false;
-    }
-    void NotifyOnCancel(Closure* callback) {
-      ADD_FAILURE() << "NotifyOnCancel() not expected during this test.";
-    }
-  };
-
-  GeneratedServiceTest()
-    : descriptor_(unittest::TestService::descriptor()),
-      foo_(descriptor_->FindMethodByName("Foo")),
-      bar_(descriptor_->FindMethodByName("Bar")),
-      stub_(&mock_channel_),
-      done_(NewPermanentCallback(&DoNothing)) {}
-
-  virtual void SetUp() {
-    ASSERT_TRUE(foo_ != NULL);
-    ASSERT_TRUE(bar_ != NULL);
-  }
-
-  const ServiceDescriptor* descriptor_;
-  const MethodDescriptor* foo_;
-  const MethodDescriptor* bar_;
-
-  MockTestService mock_service_;
-  MockController mock_controller_;
-
-  MockRpcChannel mock_channel_;
-  unittest::TestService::Stub stub_;
-
-  // Just so we don't have to re-define these with every test.
-  unittest::FooRequest foo_request_;
-  unittest::FooResponse foo_response_;
-  unittest::BarRequest bar_request_;
-  unittest::BarResponse bar_response_;
-  google::protobuf::scoped_ptr<Closure> done_;
-};
-
-TEST_F(GeneratedServiceTest, GetDescriptor) {
-  // Test that GetDescriptor() works.
-
-  EXPECT_EQ(descriptor_, mock_service_.GetDescriptor());
-}
-
-TEST_F(GeneratedServiceTest, GetChannel) {
-  EXPECT_EQ(&mock_channel_, stub_.channel());
-}
-
-TEST_F(GeneratedServiceTest, OwnsChannel) {
-  MockRpcChannel* channel = new MockRpcChannel;
-  bool destroyed = false;
-  channel->destroyed_ = &destroyed;
-
-  {
-    unittest::TestService::Stub owning_stub(channel,
-                                            Service::STUB_OWNS_CHANNEL);
-    EXPECT_FALSE(destroyed);
-  }
-
-  EXPECT_TRUE(destroyed);
-}
-
-TEST_F(GeneratedServiceTest, CallMethod) {
-  // Test that CallMethod() works.
-
-  // Call Foo() via CallMethod().
-  mock_service_.CallMethod(foo_, &mock_controller_,
-                           &foo_request_, &foo_response_, done_.get());
-
-  ASSERT_TRUE(mock_service_.called_);
-
-  EXPECT_EQ("Foo"            , mock_service_.method_    );
-  EXPECT_EQ(&mock_controller_, mock_service_.controller_);
-  EXPECT_EQ(&foo_request_    , mock_service_.request_   );
-  EXPECT_EQ(&foo_response_   , mock_service_.response_  );
-  EXPECT_EQ(done_.get()      , mock_service_.done_      );
-
-  // Try again, but call Bar() instead.
-  mock_service_.Reset();
-  mock_service_.CallMethod(bar_, &mock_controller_,
-                           &bar_request_, &bar_response_, done_.get());
-
-  ASSERT_TRUE(mock_service_.called_);
-  EXPECT_EQ("Bar", mock_service_.method_);
-}
-
-TEST_F(GeneratedServiceTest, CallMethodTypeFailure) {
-  // Verify death if we call Foo() with Bar's message types.
-
-#ifdef PROTOBUF_HAS_DEATH_TEST  // death tests do not work on Windows yet
-  EXPECT_DEBUG_DEATH(
-    mock_service_.CallMethod(foo_, &mock_controller_,
-                             &foo_request_, &bar_response_, done_.get()),
-    "dynamic_cast");
-
-  mock_service_.Reset();
-  EXPECT_DEBUG_DEATH(
-    mock_service_.CallMethod(foo_, &mock_controller_,
-                             &bar_request_, &foo_response_, done_.get()),
-    "dynamic_cast");
-#endif  // PROTOBUF_HAS_DEATH_TEST
-}
-
-TEST_F(GeneratedServiceTest, GetPrototypes) {
-  // Test Get{Request,Response}Prototype() methods.
-
-  EXPECT_EQ(&unittest::FooRequest::default_instance(),
-            &mock_service_.GetRequestPrototype(foo_));
-  EXPECT_EQ(&unittest::BarRequest::default_instance(),
-            &mock_service_.GetRequestPrototype(bar_));
-
-  EXPECT_EQ(&unittest::FooResponse::default_instance(),
-            &mock_service_.GetResponsePrototype(foo_));
-  EXPECT_EQ(&unittest::BarResponse::default_instance(),
-            &mock_service_.GetResponsePrototype(bar_));
-}
-
-TEST_F(GeneratedServiceTest, Stub) {
-  // Test that the stub class works.
-
-  // Call Foo() via the stub.
-  stub_.Foo(&mock_controller_, &foo_request_, &foo_response_, done_.get());
-
-  ASSERT_TRUE(mock_channel_.called_);
-
-  EXPECT_EQ(foo_             , mock_channel_.method_    );
-  EXPECT_EQ(&mock_controller_, mock_channel_.controller_);
-  EXPECT_EQ(&foo_request_    , mock_channel_.request_   );
-  EXPECT_EQ(&foo_response_   , mock_channel_.response_  );
-  EXPECT_EQ(done_.get()      , mock_channel_.done_      );
-
-  // Call Bar() via the stub.
-  mock_channel_.Reset();
-  stub_.Bar(&mock_controller_, &bar_request_, &bar_response_, done_.get());
-
-  ASSERT_TRUE(mock_channel_.called_);
-  EXPECT_EQ(bar_, mock_channel_.method_);
-}
-
-TEST_F(GeneratedServiceTest, NotImplemented) {
-  // Test that failing to implement a method of a service causes it to fail
-  // with a "not implemented" error message.
-
-  // A service which doesn't implement any methods.
-  class UnimplementedService : public unittest::TestService {
-   public:
-    UnimplementedService() {}
-  };
-
-  UnimplementedService unimplemented_service;
-
-  // And a controller which expects to get a "not implemented" error.
-  class ExpectUnimplementedController : public MockController {
-   public:
-    ExpectUnimplementedController() : called_(false) {}
-
-    void SetFailed(const string& reason) {
-      EXPECT_FALSE(called_);
-      called_ = true;
-      EXPECT_EQ("Method Foo() not implemented.", reason);
-    }
-
-    bool called_;
-  };
-
-  ExpectUnimplementedController controller;
-
-  // Call Foo.
-  unimplemented_service.Foo(&controller, &foo_request_, &foo_response_,
-                            done_.get());
-
-  EXPECT_TRUE(controller.called_);
-}
-
-// ===================================================================
-
-class OneofTest : public testing::Test {
- protected:
-  virtual void SetUp() {
-  }
-
-  void ExpectEnumCasesWork(const unittest::TestOneof2 &message) {
-    switch (message.foo_case()) {
-      case unittest::TestOneof2::kFooInt:
-        EXPECT_TRUE(message.has_foo_int());
-        break;
-      case unittest::TestOneof2::kFooString:
-        EXPECT_TRUE(message.has_foo_string());
-        break;
-      case unittest::TestOneof2::kFooCord:
-        EXPECT_TRUE(message.has_foo_cord());
-        break;
-      case unittest::TestOneof2::kFooStringPiece:
-        EXPECT_TRUE(message.has_foo_string_piece());
-        break;
-      case unittest::TestOneof2::kFooBytes:
-        EXPECT_TRUE(message.has_foo_bytes());
-        break;
-      case unittest::TestOneof2::kFooEnum:
-        EXPECT_TRUE(message.has_foo_enum());
-        break;
-      case unittest::TestOneof2::kFooMessage:
-        EXPECT_TRUE(message.has_foo_message());
-        break;
-      case unittest::TestOneof2::kFoogroup:
-        EXPECT_TRUE(message.has_foogroup());
-        break;
-      case unittest::TestOneof2::kFooLazyMessage:
-        EXPECT_TRUE(message.has_foo_lazy_message());
-        break;
-      case unittest::TestOneof2::FOO_NOT_SET:
-        break;
-    }
-  }
-};
-
-TEST_F(OneofTest, SettingOneFieldClearsOthers) {
-  unittest::TestOneof2 message;
-
-  message.set_foo_int(123);
-  EXPECT_TRUE(message.has_foo_int());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-  message.set_foo_string("foo");
-  EXPECT_TRUE(message.has_foo_string());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-
-  message.set_foo_bytes("qux");
-  EXPECT_TRUE(message.has_foo_bytes());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-  message.set_foo_enum(unittest::TestOneof2::FOO);
-  EXPECT_TRUE(message.has_foo_enum());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-  message.mutable_foo_message()->set_qux_int(234);
-  EXPECT_TRUE(message.has_foo_message());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-  message.mutable_foogroup()->set_a(345);
-  EXPECT_TRUE(message.has_foogroup());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-
-
-  // we repeat this because we didn't test if this properly clears other fields
-  // at the beginning.
-  message.set_foo_int(123);
-  EXPECT_TRUE(message.has_foo_int());
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
-}
-
-TEST_F(OneofTest, EnumCases) {
-  unittest::TestOneof2 message;
-
-  message.set_foo_int(123);
-  ExpectEnumCasesWork(message);
-  message.set_foo_string("foo");
-  ExpectEnumCasesWork(message);
-  message.set_foo_bytes("qux");
-  ExpectEnumCasesWork(message);
-  message.set_foo_enum(unittest::TestOneof2::FOO);
-  ExpectEnumCasesWork(message);
-  message.mutable_foo_message()->set_qux_int(234);
-  ExpectEnumCasesWork(message);
-  message.mutable_foogroup()->set_a(345);
-  ExpectEnumCasesWork(message);
-}
-
-TEST_F(OneofTest, PrimitiveType) {
-  unittest::TestOneof2 message;
-  // Unset field returns default value
-  EXPECT_EQ(message.foo_int(), 0);
-
-  message.set_foo_int(123);
-  EXPECT_TRUE(message.has_foo_int());
-  EXPECT_EQ(message.foo_int(), 123);
-  message.clear_foo_int();
-  EXPECT_FALSE(message.has_foo_int());
-}
-
-TEST_F(OneofTest, EnumType) {
-  unittest::TestOneof2 message;
-  // Unset field returns default value
-  EXPECT_EQ(message.foo_enum(), 1);
-
-  message.set_foo_enum(unittest::TestOneof2::FOO);
-  EXPECT_TRUE(message.has_foo_enum());
-  EXPECT_EQ(message.foo_enum(), unittest::TestOneof2::FOO);
-  message.clear_foo_enum();
-  EXPECT_FALSE(message.has_foo_enum());
-}
-
-TEST_F(OneofTest, SetString) {
-  // Check that setting a string field in various ways works
-  unittest::TestOneof2 message;
-
-  // Unset field returns default value
-  EXPECT_EQ(message.foo_string(), "");
-
-  message.set_foo_string("foo");
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "foo");
-  message.clear_foo_string();
-  EXPECT_FALSE(message.has_foo_string());
-
-  message.set_foo_string(string("bar"));
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "bar");
-  message.clear_foo_string();
-  EXPECT_FALSE(message.has_foo_string());
-
-
-  message.set_foo_string("qux", 3);
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "qux");
-  message.clear_foo_string();
-  EXPECT_FALSE(message.has_foo_string());
-
-  message.mutable_foo_string()->assign("quux");
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "quux");
-  message.clear_foo_string();
-  EXPECT_FALSE(message.has_foo_string());
-
-  message.set_foo_string("corge");
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "corge");
-  message.clear_foo_string();
-  EXPECT_FALSE(message.has_foo_string());
-}
-
-TEST_F(OneofTest, ReleaseString) {
-  // Check that release_foo() starts out NULL, and gives us a value
-  // that we can delete after it's been set.
-  unittest::TestOneof2 message;
-
-  EXPECT_EQ(NULL, message.release_foo_string());
-  EXPECT_FALSE(message.has_foo_string());
-
-  message.set_foo_string("blah");
-  EXPECT_TRUE(message.has_foo_string());
-  google::protobuf::scoped_ptr<string> str(message.release_foo_string());
-  EXPECT_FALSE(message.has_foo_string());
-  ASSERT_TRUE(str != NULL);
-  EXPECT_EQ("blah", *str);
-
-  EXPECT_EQ(NULL, message.release_foo_string());
-  EXPECT_FALSE(message.has_foo_string());
-}
-
-TEST_F(OneofTest, SetAllocatedString) {
-  // Check that set_allocated_foo() works for strings.
-  unittest::TestOneof2 message;
-
-  EXPECT_FALSE(message.has_foo_string());
-  const string kHello("hello");
-  message.set_foo_string(kHello);
-  EXPECT_TRUE(message.has_foo_string());
-
-  message.set_allocated_foo_string(NULL);
-  EXPECT_FALSE(message.has_foo_string());
-  EXPECT_EQ("", message.foo_string());
-
-  message.set_allocated_foo_string(new string(kHello));
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(kHello, message.foo_string());
-}
-
-
-TEST_F(OneofTest, SetMessage) {
-  // Check that setting a message field works
-  unittest::TestOneof2 message;
-
-  // Unset field returns default instance
-  EXPECT_EQ(&message.foo_message(),
-            &unittest::TestOneof2_NestedMessage::default_instance());
-  EXPECT_EQ(message.foo_message().qux_int(), 0);
-
-  message.mutable_foo_message()->set_qux_int(234);
-  EXPECT_TRUE(message.has_foo_message());
-  EXPECT_EQ(message.foo_message().qux_int(), 234);
-  message.clear_foo_message();
-  EXPECT_FALSE(message.has_foo_message());
-}
-
-TEST_F(OneofTest, ReleaseMessage) {
-  // Check that release_foo() starts out NULL, and gives us a value
-  // that we can delete after it's been set.
-  unittest::TestOneof2 message;
-
-  EXPECT_EQ(NULL, message.release_foo_message());
-  EXPECT_FALSE(message.has_foo_message());
-
-  message.mutable_foo_message()->set_qux_int(1);
-  EXPECT_TRUE(message.has_foo_message());
-  google::protobuf::scoped_ptr<unittest::TestOneof2_NestedMessage> mes(
-      message.release_foo_message());
-  EXPECT_FALSE(message.has_foo_message());
-  ASSERT_TRUE(mes != NULL);
-  EXPECT_EQ(1, mes->qux_int());
-
-  EXPECT_EQ(NULL, message.release_foo_message());
-  EXPECT_FALSE(message.has_foo_message());
-}
-
-TEST_F(OneofTest, SetAllocatedMessage) {
-  // Check that set_allocated_foo() works for messages.
-  unittest::TestOneof2 message;
-
-  EXPECT_FALSE(message.has_foo_message());
-
-  message.mutable_foo_message()->set_qux_int(1);
-  EXPECT_TRUE(message.has_foo_message());
-
-  message.set_allocated_foo_message(NULL);
-  EXPECT_FALSE(message.has_foo_message());
-  EXPECT_EQ(&message.foo_message(),
-            &unittest::TestOneof2_NestedMessage::default_instance());
-
-  message.mutable_foo_message()->set_qux_int(1);
-  unittest::TestOneof2_NestedMessage* mes = message.release_foo_message();
-  ASSERT_TRUE(mes != NULL);
-  EXPECT_FALSE(message.has_foo_message());
-
-  message.set_allocated_foo_message(mes);
-  EXPECT_TRUE(message.has_foo_message());
-  EXPECT_EQ(1, message.foo_message().qux_int());
-}
-
-
-TEST_F(OneofTest, Clear) {
-  unittest::TestOneof2 message;
-
-  message.set_foo_int(1);
-  EXPECT_TRUE(message.has_foo_int());
-  message.clear_foo_int();
-  EXPECT_FALSE(message.has_foo_int());
-}
-
-TEST_F(OneofTest, Defaults) {
-  unittest::TestOneof2 message;
-
-  EXPECT_FALSE(message.has_foo_int());
-  EXPECT_EQ(message.foo_int(), 0);
-
-  EXPECT_FALSE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "");
-
-
-  EXPECT_FALSE(message.has_foo_bytes());
-  EXPECT_EQ(message.foo_bytes(), "");
-
-  EXPECT_FALSE(message.has_foo_enum());
-  EXPECT_EQ(message.foo_enum(), 1);
-
-  EXPECT_FALSE(message.has_foo_message());
-  EXPECT_EQ(message.foo_message().qux_int(), 0);
-
-  EXPECT_FALSE(message.has_foogroup());
-  EXPECT_EQ(message.foogroup().a(), 0);
-
-
-  EXPECT_FALSE(message.has_bar_int());
-  EXPECT_EQ(message.bar_int(), 5);
-
-  EXPECT_FALSE(message.has_bar_string());
-  EXPECT_EQ(message.bar_string(), "STRING");
-
-
-  EXPECT_FALSE(message.has_bar_bytes());
-  EXPECT_EQ(message.bar_bytes(), "BYTES");
-
-  EXPECT_FALSE(message.has_bar_enum());
-  EXPECT_EQ(message.bar_enum(), 2);
-}
-
-TEST_F(OneofTest, SwapWithEmpty) {
-  unittest::TestOneof2 message1, message2;
-  message1.set_foo_string("FOO");
-  EXPECT_TRUE(message1.has_foo_string());
-  message1.Swap(&message2);
-  EXPECT_FALSE(message1.has_foo_string());
-  EXPECT_TRUE(message2.has_foo_string());
-  EXPECT_EQ(message2.foo_string(), "FOO");
-}
-
-TEST_F(OneofTest, SwapWithSelf) {
-  unittest::TestOneof2 message;
-  message.set_foo_string("FOO");
-  EXPECT_TRUE(message.has_foo_string());
-  message.Swap(&message);
-  EXPECT_TRUE(message.has_foo_string());
-  EXPECT_EQ(message.foo_string(), "FOO");
-}
-
-TEST_F(OneofTest, SwapBothHasFields) {
-  unittest::TestOneof2 message1, message2;
-
-  message1.set_foo_string("FOO");
-  EXPECT_TRUE(message1.has_foo_string());
-  message2.mutable_foo_message()->set_qux_int(1);
-  EXPECT_TRUE(message2.has_foo_message());
-
-  message1.Swap(&message2);
-  EXPECT_FALSE(message1.has_foo_string());
-  EXPECT_FALSE(message2.has_foo_message());
-  EXPECT_TRUE(message1.has_foo_message());
-  EXPECT_EQ(message1.foo_message().qux_int(), 1);
-  EXPECT_TRUE(message2.has_foo_string());
-  EXPECT_EQ(message2.foo_string(), "FOO");
-}
-
-TEST_F(OneofTest, CopyConstructor) {
-  unittest::TestOneof2 message1;
-  message1.set_foo_bytes("FOO");
-
-  unittest::TestOneof2 message2(message1);
-  EXPECT_TRUE(message2.has_foo_bytes());
-  EXPECT_EQ(message2.foo_bytes(), "FOO");
-}
-
-TEST_F(OneofTest, CopyFrom) {
-  unittest::TestOneof2 message1, message2;
-  message1.set_foo_enum(unittest::TestOneof2::BAR);
-  EXPECT_TRUE(message1.has_foo_enum());
-
-  message2.CopyFrom(message1);
-  EXPECT_TRUE(message2.has_foo_enum());
-  EXPECT_EQ(message2.foo_enum(), unittest::TestOneof2::BAR);
-
-  // Copying from self should be a no-op.
-  message2.CopyFrom(message2);
-  EXPECT_TRUE(message2.has_foo_enum());
-  EXPECT_EQ(message2.foo_enum(), unittest::TestOneof2::BAR);
-}
-
-TEST_F(OneofTest, CopyAssignmentOperator) {
-  unittest::TestOneof2 message1;
-  message1.mutable_foo_message()->set_qux_int(123);
-  EXPECT_TRUE(message1.has_foo_message());
-
-  unittest::TestOneof2 message2;
-  message2 = message1;
-  EXPECT_EQ(message2.foo_message().qux_int(), 123);
-
-  // Make sure that self-assignment does something sane.
-  message2 = message2;
-  EXPECT_EQ(message2.foo_message().qux_int(), 123);
-}
-
-TEST_F(OneofTest, UpcastCopyFrom) {
-  // Test the CopyFrom method that takes in the generic const Message&
-  // parameter.
-  unittest::TestOneof2 message1, message2;
-  message1.mutable_foogroup()->set_a(123);
-  EXPECT_TRUE(message1.has_foogroup());
-
-  const Message* source = implicit_cast<const Message*>(&message1);
-  message2.CopyFrom(*source);
-
-  EXPECT_TRUE(message2.has_foogroup());
-  EXPECT_EQ(message2.foogroup().a(), 123);
-}
-
-// Test the generated SerializeWithCachedSizesToArray(),
-// This indirectly tests MergePartialFromCodedStream()
-// We have to test each field type separately because we cannot set them at the
-// same time
-TEST_F(OneofTest, SerializationToArray) {
-  // Primitive type
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_int(123);
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_int(), 123);
-  }
-
-  // String
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_string("foo");
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_string(), "foo");
-  }
-
-
-  // Bytes
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_bytes("qux");
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_bytes(), "qux");
-  }
-
-  // Enum
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_enum(unittest::TestOneof2::FOO);
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_enum(), unittest::TestOneof2::FOO);
-  }
-
-  // Message
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.mutable_foo_message()->set_qux_int(234);
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_message().qux_int(), 234);
-  }
-
-  // Group
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.mutable_foogroup()->set_a(345);
-    int size = message1.ByteSize();
-    data.resize(size);
-    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
-    uint8* end = message1.SerializeWithCachedSizesToArray(start);
-    EXPECT_EQ(size, end - start);
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foogroup().a(), 345);
-  }
-
-}
-
-// Test the generated SerializeWithCachedSizes() by forcing the buffer to write
-// one byte at a time.
-// This indirectly tests MergePartialFromCodedStream()
-// We have to test each field type separately because we cannot set them at the
-// same time
-TEST_F(OneofTest, SerializationToStream) {
-  // Primitive type
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_int(123);
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_int(), 123);
-  }
-
-  // String
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_string("foo");
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_string(), "foo");
-  }
-
-
-  // Bytes
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_bytes("qux");
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_bytes(), "qux");
-  }
-
-  // Enum
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.set_foo_enum(unittest::TestOneof2::FOO);
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_enum(), unittest::TestOneof2::FOO);
-  }
-
-  // Message
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.mutable_foo_message()->set_qux_int(234);
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foo_message().qux_int(), 234);
-  }
-
-  // Group
-  {
-    unittest::TestOneof2 message1, message2;
-    string data;
-    message1.mutable_foogroup()->set_a(345);
-    int size = message1.ByteSize();
-    data.resize(size);
-
-    {
-      // Allow the output stream to buffer only one byte at a time.
-      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
-      io::CodedOutputStream output_stream(&array_stream);
-      message1.SerializeWithCachedSizes(&output_stream);
-      EXPECT_FALSE(output_stream.HadError());
-      EXPECT_EQ(size, output_stream.ByteCount());
-    }
-
-    EXPECT_TRUE(message2.ParseFromString(data));
-    EXPECT_EQ(message2.foogroup().a(), 345);
-  }
-
-}
-
-TEST_F(OneofTest, MergeFrom) {
-  unittest::TestOneof2 message1, message2;
-
-  message1.set_foo_int(123);
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foo_int());
-  EXPECT_EQ(message2.foo_int(), 123);
-
-  message1.set_foo_string("foo");
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foo_string());
-  EXPECT_EQ(message2.foo_string(), "foo");
-
-
-  message1.set_foo_bytes("qux");
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foo_bytes());
-  EXPECT_EQ(message2.foo_bytes(), "qux");
-
-  message1.set_foo_enum(unittest::TestOneof2::FOO);
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foo_enum());
-  EXPECT_EQ(message2.foo_enum(), unittest::TestOneof2::FOO);
-
-  message1.mutable_foo_message()->set_qux_int(234);
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foo_message());
-  EXPECT_EQ(message2.foo_message().qux_int(), 234);
-
-  message1.mutable_foogroup()->set_a(345);
-  message2.MergeFrom(message1);
-  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
-  EXPECT_TRUE(message2.has_foogroup());
-  EXPECT_EQ(message2.foogroup().a(), 345);
-
-}
-
 }  // namespace cpp_unittest
 }  // namespace cpp
 }  // namespace compiler
-
-namespace no_generic_services_test {
-  // Verify that no class called "TestService" was defined in
-  // unittest_no_generic_services.pb.h by defining a different type by the same
-  // name.  If such a service was generated, this will not compile.
-  struct TestService {
-    int i;
-  };
-}
-
-namespace compiler {
-namespace cpp {
-namespace cpp_unittest {
-
-TEST_F(GeneratedServiceTest, NoGenericServices) {
-  // Verify that non-services in unittest_no_generic_services.proto were
-  // generated.
-  no_generic_services_test::TestMessage message;
-  message.set_a(1);
-  message.SetExtension(no_generic_services_test::test_extension, 123);
-  no_generic_services_test::TestEnum e = no_generic_services_test::FOO;
-  EXPECT_EQ(e, 1);
-
-  // Verify that a ServiceDescriptor is generated for the service even if the
-  // class itself is not.
-  const FileDescriptor* file =
-      no_generic_services_test::TestMessage::descriptor()->file();
-
-  ASSERT_EQ(1, file->service_count());
-  EXPECT_EQ("TestService", file->service(0)->name());
-  ASSERT_EQ(1, file->service(0)->method_count());
-  EXPECT_EQ("Foo", file->service(0)->method(0)->name());
-}
-
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-
-// ===================================================================
-
-// This test must run last.  It verifies that descriptors were or were not
-// initialized depending on whether PROTOBUF_TEST_NO_DESCRIPTORS was defined.
-// When this is defined, we skip all tests which are expected to trigger
-// descriptor initialization.  This verifies that everything else still works
-// if descriptors are not initialized.
-TEST(DescriptorInitializationTest, Initialized) {
-#ifdef PROTOBUF_TEST_NO_DESCRIPTORS
-  bool should_have_descriptors = false;
-#else
-  bool should_have_descriptors = true;
-#endif
-
-  EXPECT_EQ(should_have_descriptors,
-    DescriptorPool::generated_pool()->InternalIsFileLoaded(
-      "google/protobuf/unittest.proto"));
-}
-
-}  // namespace cpp_unittest
-
-}  // namespace cpp
-}  // namespace compiler
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/compiler/cpp/cpp_unittest.inc b/src/google/protobuf/compiler/cpp/cpp_unittest.inc
new file mode 100644
index 00000000..ff6354f8
--- /dev/null
+++ b/src/google/protobuf/compiler/cpp/cpp_unittest.inc
@@ -0,0 +1,2281 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// To test the code generator, we actually use it to generate code for
+// google/protobuf/unittest.proto, then test that.  This means that we
+// are actually testing the parser and other parts of the system at the same
+// time, and that problems in the generator may show up as compile-time errors
+// rather than unittest failures, which may be surprising.  However, testing
+// the output of the C++ generator directly would be very hard.  We can't very
+// well just check it against golden files since those files would have to be
+// updated for any small change; such a test would be very brittle and probably
+// not very helpful.  What we really want to test is that the code compiles
+// correctly and produces the interfaces we expect, which is why this test
+// is written this way.
+
+#include <google/protobuf/compiler/cpp/cpp_unittest.h>
+
+#include <memory>
+#include <vector>
+
+#include <google/protobuf/unittest_no_arena.pb.h>
+#if !defined(GOOGLE_PROTOBUF_CMAKE_BUILD) && !defined(_MSC_VER)
+// We exclude this large proto from cmake build because it's too large for
+// visual studio to compile (report internal errors).
+#include <google/protobuf/unittest_enormous_descriptor.pb.h>
+#endif
+#include <google/protobuf/compiler/cpp/cpp_helpers.h>
+#include <google/protobuf/compiler/cpp/cpp_test_bad_identifiers.pb.h>
+#include <google/protobuf/compiler/importer.h>
+#include <google/protobuf/unittest_no_generic_services.pb.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/dynamic_message.h>
+
+#include <google/protobuf/stubs/callback.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/substitute.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+#include <google/protobuf/stubs/stl_util.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace cpp {
+
+// Can't use an anonymous namespace here due to brokenness of Tru64 compiler.
+namespace cpp_unittest {
+
+
+class MockErrorCollector : public MultiFileErrorCollector {
+ public:
+  MockErrorCollector() {}
+  ~MockErrorCollector() {}
+
+  string text_;
+
+  // implements ErrorCollector ---------------------------------------
+  void AddError(const string& filename, int line, int column,
+                const string& message) {
+    strings::SubstituteAndAppend(&text_, "$0:$1:$2: $3\n",
+                                 filename, line, column, message);
+  }
+};
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+
+// Test that generated code has proper descriptors:
+// Parse a descriptor directly (using google::protobuf::compiler::Importer) and
+// compare it to the one that was produced by generated code.
+TEST(GENERATED_DESCRIPTOR_TEST_NAME, IdenticalDescriptors) {
+  const FileDescriptor* generated_descriptor =
+    UNITTEST::TestAllTypes::descriptor()->file();
+
+  // Set up the Importer.
+  MockErrorCollector error_collector;
+  DiskSourceTree source_tree;
+  source_tree.MapPath("", TestSourceDir());
+  Importer importer(&source_tree, &error_collector);
+
+  // Import (parse) unittest.proto.
+  const FileDescriptor* parsed_descriptor =
+    importer.Import(UNITTEST_PROTO_PATH);
+  EXPECT_EQ("", error_collector.text_);
+  ASSERT_TRUE(parsed_descriptor != NULL);
+
+  // Test that descriptors are generated correctly by converting them to
+  // FileDescriptorProtos and comparing.
+  FileDescriptorProto generated_descriptor_proto, parsed_descriptor_proto;
+  generated_descriptor->CopyTo(&generated_descriptor_proto);
+  parsed_descriptor->CopyTo(&parsed_descriptor_proto);
+
+  EXPECT_EQ(parsed_descriptor_proto.DebugString(),
+            generated_descriptor_proto.DebugString());
+}
+
+#if !defined(GOOGLE_PROTOBUF_CMAKE_BUILD) && !defined(_MSC_VER)
+// Test that generated code has proper descriptors:
+// Touch a descriptor generated from an enormous message to validate special
+// handling for descriptors exceeding the C++ standard's recommended minimum
+// limit for string literal size
+TEST(GENERATED_DESCRIPTOR_TEST_NAME, EnormousDescriptor) {
+  const Descriptor* generated_descriptor =
+    TestEnormousDescriptor::descriptor();
+
+  EXPECT_TRUE(generated_descriptor != NULL);
+}
+#endif
+
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+
+// ===================================================================
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Defaults) {
+  // Check that all default values are set correctly in the initial message.
+  UNITTEST::TestAllTypes message;
+
+  TestUtil::ExpectClear(message);
+
+  // Messages should return pointers to default instances until first use.
+  // (This is not checked by ExpectClear() since it is not actually true after
+  // the fields have been set and then cleared.)
+  EXPECT_EQ(&UNITTEST::TestAllTypes::OptionalGroup::default_instance(),
+            &message.optionalgroup());
+  EXPECT_EQ(&UNITTEST::TestAllTypes::NestedMessage::default_instance(),
+            &message.optional_nested_message());
+  EXPECT_EQ(&UNITTEST::ForeignMessage::default_instance(),
+            &message.optional_foreign_message());
+  EXPECT_EQ(&UNITTEST_IMPORT::ImportMessage::default_instance(),
+            &message.optional_import_message());
+}
+
+#ifndef PROTOBUF_USE_DLLS
+TEST(GENERATED_MESSAGE_TEST_NAME, Int32StringConversion) {
+  EXPECT_EQ("971", Int32ToString(971));
+  EXPECT_EQ("(~0x7fffffff)", Int32ToString(kint32min));
+  EXPECT_EQ("2147483647", Int32ToString(kint32max));
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Int64StringConversion) {
+  EXPECT_EQ("GOOGLE_LONGLONG(971)", Int64ToString(971));
+  EXPECT_EQ("GOOGLE_LONGLONG(-2147483648)", Int64ToString(kint32min));
+  EXPECT_EQ("GOOGLE_LONGLONG(~0x7fffffffffffffff)", Int64ToString(kint64min));
+  EXPECT_EQ("GOOGLE_LONGLONG(9223372036854775807)", Int64ToString(kint64max));
+}
+#endif  // !PROTOBUF_USE_DLLS
+
+TEST(GENERATED_MESSAGE_TEST_NAME, FloatingPointDefaults) {
+  const UNITTEST::TestExtremeDefaultValues& extreme_default =
+      UNITTEST::TestExtremeDefaultValues::default_instance();
+
+  EXPECT_EQ(0.0f, extreme_default.zero_float());
+  EXPECT_EQ(1.0f, extreme_default.one_float());
+  EXPECT_EQ(1.5f, extreme_default.small_float());
+  EXPECT_EQ(-1.0f, extreme_default.negative_one_float());
+  EXPECT_EQ(-1.5f, extreme_default.negative_float());
+  EXPECT_EQ(2.0e8f, extreme_default.large_float());
+  EXPECT_EQ(-8e-28f, extreme_default.small_negative_float());
+  EXPECT_EQ(std::numeric_limits<double>::infinity(),
+            extreme_default.inf_double());
+  EXPECT_EQ(-std::numeric_limits<double>::infinity(),
+            extreme_default.neg_inf_double());
+  EXPECT_TRUE(extreme_default.nan_double() != extreme_default.nan_double());
+  EXPECT_EQ(std::numeric_limits<float>::infinity(),
+            extreme_default.inf_float());
+  EXPECT_EQ(-std::numeric_limits<float>::infinity(),
+            extreme_default.neg_inf_float());
+  EXPECT_TRUE(extreme_default.nan_float() != extreme_default.nan_float());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Trigraph) {
+  const UNITTEST::TestExtremeDefaultValues& extreme_default =
+      UNITTEST::TestExtremeDefaultValues::default_instance();
+
+  EXPECT_EQ("? ? ?? ?? ??? ?\?/ ?\?-", extreme_default.cpp_trigraph());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ExtremeSmallIntegerDefault) {
+  const UNITTEST::TestExtremeDefaultValues& extreme_default =
+      UNITTEST::TestExtremeDefaultValues::default_instance();
+  EXPECT_EQ(~0x7fffffff, kint32min);
+  EXPECT_EQ(GOOGLE_LONGLONG(~0x7fffffffffffffff), kint64min);
+  EXPECT_EQ(kint32min, extreme_default.really_small_int32());
+  EXPECT_EQ(kint64min, extreme_default.really_small_int64());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Accessors) {
+  // Set every field to a unique value then go back and check all those
+  // values.
+  UNITTEST::TestAllTypes message;
+
+  TestUtil::SetAllFields(&message);
+  TestUtil::ExpectAllFieldsSet(message);
+
+  TestUtil::ModifyRepeatedFields(&message);
+  TestUtil::ExpectRepeatedFieldsModified(message);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, MutableStringDefault) {
+  // mutable_foo() for a string should return a string initialized to its
+  // default value.
+  UNITTEST::TestAllTypes message;
+
+  EXPECT_EQ("hello", *message.mutable_default_string());
+
+  // Note that the first time we call mutable_foo(), we get a newly-allocated
+  // string, but if we clear it and call it again, we get the same object again.
+  // We should verify that it has its default value in both cases.
+  message.set_default_string("blah");
+  message.Clear();
+
+  EXPECT_EQ("hello", *message.mutable_default_string());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, StringDefaults) {
+  UNITTEST::TestExtremeDefaultValues message;
+  // Check if '\000' can be used in default string value.
+  EXPECT_EQ(string("hel\000lo", 6), message.string_with_zero());
+  EXPECT_EQ(string("wor\000ld", 6), message.bytes_with_zero());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ReleaseString) {
+  // Check that release_foo() starts out NULL, and gives us a value
+  // that we can delete after it's been set.
+  UNITTEST::TestAllTypes message;
+
+  EXPECT_EQ(NULL, message.release_default_string());
+  EXPECT_FALSE(message.has_default_string());
+  EXPECT_EQ("hello", message.default_string());
+
+  message.set_default_string("blah");
+  EXPECT_TRUE(message.has_default_string());
+  std::unique_ptr<string> str(message.release_default_string());
+  EXPECT_FALSE(message.has_default_string());
+  ASSERT_TRUE(str != NULL);
+  EXPECT_EQ("blah", *str);
+
+  EXPECT_EQ(NULL, message.release_default_string());
+  EXPECT_FALSE(message.has_default_string());
+  EXPECT_EQ("hello", message.default_string());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ReleaseMessage) {
+  // Check that release_foo() starts out NULL, and gives us a value
+  // that we can delete after it's been set.
+  UNITTEST::TestAllTypes message;
+
+  EXPECT_EQ(NULL, message.release_optional_nested_message());
+  EXPECT_FALSE(message.has_optional_nested_message());
+
+  message.mutable_optional_nested_message()->set_bb(1);
+  std::unique_ptr<UNITTEST::TestAllTypes::NestedMessage> nest(
+      message.release_optional_nested_message());
+  EXPECT_FALSE(message.has_optional_nested_message());
+  ASSERT_TRUE(nest != NULL);
+  EXPECT_EQ(1, nest->bb());
+
+  EXPECT_EQ(NULL, message.release_optional_nested_message());
+  EXPECT_FALSE(message.has_optional_nested_message());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, SetAllocatedString) {
+  // Check that set_allocated_foo() works for strings.
+  UNITTEST::TestAllTypes message;
+
+  EXPECT_FALSE(message.has_optional_string());
+  const string kHello("hello");
+  message.set_optional_string(kHello);
+  EXPECT_TRUE(message.has_optional_string());
+
+  message.set_allocated_optional_string(NULL);
+  EXPECT_FALSE(message.has_optional_string());
+  EXPECT_EQ("", message.optional_string());
+
+  message.set_allocated_optional_string(new string(kHello));
+  EXPECT_TRUE(message.has_optional_string());
+  EXPECT_EQ(kHello, message.optional_string());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, SetAllocatedMessage) {
+  // Check that set_allocated_foo() can be called in all cases.
+  UNITTEST::TestAllTypes message;
+
+  EXPECT_FALSE(message.has_optional_nested_message());
+
+  message.mutable_optional_nested_message()->set_bb(1);
+  EXPECT_TRUE(message.has_optional_nested_message());
+
+  message.set_allocated_optional_nested_message(NULL);
+  EXPECT_FALSE(message.has_optional_nested_message());
+  EXPECT_EQ(&UNITTEST::TestAllTypes::NestedMessage::default_instance(),
+            &message.optional_nested_message());
+
+  message.mutable_optional_nested_message()->set_bb(1);
+  UNITTEST::TestAllTypes::NestedMessage* nest =
+      message.release_optional_nested_message();
+  ASSERT_TRUE(nest != NULL);
+  EXPECT_FALSE(message.has_optional_nested_message());
+
+  message.set_allocated_optional_nested_message(nest);
+  EXPECT_TRUE(message.has_optional_nested_message());
+  EXPECT_EQ(1, message.optional_nested_message().bb());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Clear) {
+  // Set every field to a unique value, clear the message, then check that
+  // it is cleared.
+  UNITTEST::TestAllTypes message;
+
+  TestUtil::SetAllFields(&message);
+  message.Clear();
+  TestUtil::ExpectClear(message);
+
+  // Unlike with the defaults test, we do NOT expect that requesting embedded
+  // messages will return a pointer to the default instance.  Instead, they
+  // should return the objects that were created when mutable_blah() was
+  // called.
+  EXPECT_NE(&UNITTEST::TestAllTypes::OptionalGroup::default_instance(),
+            &message.optionalgroup());
+  EXPECT_NE(&UNITTEST::TestAllTypes::NestedMessage::default_instance(),
+            &message.optional_nested_message());
+  EXPECT_NE(&UNITTEST::ForeignMessage::default_instance(),
+            &message.optional_foreign_message());
+  EXPECT_NE(&UNITTEST_IMPORT::ImportMessage::default_instance(),
+            &message.optional_import_message());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, EmbeddedNullsInBytesCharStar) {
+  UNITTEST::TestAllTypes message;
+
+  const char* value = "\0lalala\0\0";
+  message.set_optional_bytes(value, 9);
+  ASSERT_EQ(9, message.optional_bytes().size());
+  EXPECT_EQ(0, memcmp(value, message.optional_bytes().data(), 9));
+
+  message.add_repeated_bytes(value, 9);
+  ASSERT_EQ(9, message.repeated_bytes(0).size());
+  EXPECT_EQ(0, memcmp(value, message.repeated_bytes(0).data(), 9));
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ClearOneField) {
+  // Set every field to a unique value, then clear one value and insure that
+  // only that one value is cleared.
+  UNITTEST::TestAllTypes message;
+
+  TestUtil::SetAllFields(&message);
+  int64 original_value = message.optional_int64();
+
+  // Clear the field and make sure it shows up as cleared.
+  message.clear_optional_int64();
+  EXPECT_FALSE(message.has_optional_int64());
+  EXPECT_EQ(0, message.optional_int64());
+
+  // Other adjacent fields should not be cleared.
+  EXPECT_TRUE(message.has_optional_int32());
+  EXPECT_TRUE(message.has_optional_uint32());
+
+  // Make sure if we set it again, then all fields are set.
+  message.set_optional_int64(original_value);
+  TestUtil::ExpectAllFieldsSet(message);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, StringCharStarLength) {
+  // Verify that we can use a char*,length to set one of the string fields.
+  UNITTEST::TestAllTypes message;
+  message.set_optional_string("abcdef", 3);
+  EXPECT_EQ("abc", message.optional_string());
+
+  // Verify that we can use a char*,length to add to a repeated string field.
+  message.add_repeated_string("abcdef", 3);
+  EXPECT_EQ(1, message.repeated_string_size());
+  EXPECT_EQ("abc", message.repeated_string(0));
+
+  // Verify that we can use a char*,length to set a repeated string field.
+  message.set_repeated_string(0, "wxyz", 2);
+  EXPECT_EQ("wx", message.repeated_string(0));
+}
+
+#if LANG_CXX11
+TEST(GENERATED_MESSAGE_TEST_NAME, StringMove) {
+  // Verify that we trigger the move behavior on a scalar setter.
+  protobuf_unittest_no_arena::TestAllTypes message;
+  {
+    string tmp(32, 'a');
+
+    const char* old_data = tmp.data();
+    message.set_optional_string(std::move(tmp));
+    const char* new_data = message.optional_string().data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'a'), message.optional_string());
+
+    string tmp2(32, 'b');
+    old_data = tmp2.data();
+    message.set_optional_string(std::move(tmp2));
+    new_data = message.optional_string().data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'b'), message.optional_string());
+  }
+
+  // Verify that we trigger the move behavior on a oneof setter.
+  {
+    string tmp(32, 'a');
+
+    const char* old_data = tmp.data();
+    message.set_oneof_string(std::move(tmp));
+    const char* new_data = message.oneof_string().data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'a'), message.oneof_string());
+
+    string tmp2(32, 'b');
+    old_data = tmp2.data();
+    message.set_oneof_string(std::move(tmp2));
+    new_data = message.oneof_string().data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'b'), message.oneof_string());
+  }
+
+  // Verify that we trigger the move behavior on a repeated setter.
+  {
+    string tmp(32, 'a');
+
+    const char* old_data = tmp.data();
+    message.add_repeated_string(std::move(tmp));
+    const char* new_data = message.repeated_string(0).data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'a'), message.repeated_string(0));
+
+    string tmp2(32, 'b');
+    old_data = tmp2.data();
+    message.set_repeated_string(0, std::move(tmp2));
+    new_data = message.repeated_string(0).data();
+
+    EXPECT_EQ(old_data, new_data);
+    EXPECT_EQ(string(32, 'b'), message.repeated_string(0));
+  }
+}
+#endif
+
+
+TEST(GENERATED_MESSAGE_TEST_NAME, CopyFrom) {
+  UNITTEST::TestAllTypes message1, message2;
+
+  TestUtil::SetAllFields(&message1);
+  message2.CopyFrom(message1);
+  TestUtil::ExpectAllFieldsSet(message2);
+
+  // Copying from self should be a no-op.
+  message2.CopyFrom(message2);
+  TestUtil::ExpectAllFieldsSet(message2);
+}
+
+
+TEST(GENERATED_MESSAGE_TEST_NAME, SwapWithEmpty) {
+  UNITTEST::TestAllTypes message1, message2;
+  TestUtil::SetAllFields(&message1);
+
+  TestUtil::ExpectAllFieldsSet(message1);
+  TestUtil::ExpectClear(message2);
+  message1.Swap(&message2);
+  TestUtil::ExpectAllFieldsSet(message2);
+  TestUtil::ExpectClear(message1);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, SwapWithSelf) {
+  UNITTEST::TestAllTypes message;
+  TestUtil::SetAllFields(&message);
+  TestUtil::ExpectAllFieldsSet(message);
+  message.Swap(&message);
+  TestUtil::ExpectAllFieldsSet(message);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, SwapWithOther) {
+  UNITTEST::TestAllTypes message1, message2;
+
+  message1.set_optional_int32(123);
+  message1.set_optional_string("abc");
+  message1.mutable_optional_nested_message()->set_bb(1);
+  message1.set_optional_nested_enum(UNITTEST::TestAllTypes::FOO);
+  message1.add_repeated_int32(1);
+  message1.add_repeated_int32(2);
+  message1.add_repeated_string("a");
+  message1.add_repeated_string("b");
+  message1.add_repeated_nested_message()->set_bb(7);
+  message1.add_repeated_nested_message()->set_bb(8);
+  message1.add_repeated_nested_enum(UNITTEST::TestAllTypes::FOO);
+  message1.add_repeated_nested_enum(UNITTEST::TestAllTypes::BAR);
+
+  message2.set_optional_int32(456);
+  message2.set_optional_string("def");
+  message2.mutable_optional_nested_message()->set_bb(2);
+  message2.set_optional_nested_enum(UNITTEST::TestAllTypes::BAR);
+  message2.add_repeated_int32(3);
+  message2.add_repeated_string("c");
+  message2.add_repeated_nested_message()->set_bb(9);
+  message2.add_repeated_nested_enum(UNITTEST::TestAllTypes::BAZ);
+
+  message1.Swap(&message2);
+
+  EXPECT_EQ(456, message1.optional_int32());
+  EXPECT_EQ("def", message1.optional_string());
+  EXPECT_EQ(2, message1.optional_nested_message().bb());
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message1.optional_nested_enum());
+  ASSERT_EQ(1, message1.repeated_int32_size());
+  EXPECT_EQ(3, message1.repeated_int32(0));
+  ASSERT_EQ(1, message1.repeated_string_size());
+  EXPECT_EQ("c", message1.repeated_string(0));
+  ASSERT_EQ(1, message1.repeated_nested_message_size());
+  EXPECT_EQ(9, message1.repeated_nested_message(0).bb());
+  ASSERT_EQ(1, message1.repeated_nested_enum_size());
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ, message1.repeated_nested_enum(0));
+
+  EXPECT_EQ(123, message2.optional_int32());
+  EXPECT_EQ("abc", message2.optional_string());
+  EXPECT_EQ(1, message2.optional_nested_message().bb());
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO, message2.optional_nested_enum());
+  ASSERT_EQ(2, message2.repeated_int32_size());
+  EXPECT_EQ(1, message2.repeated_int32(0));
+  EXPECT_EQ(2, message2.repeated_int32(1));
+  ASSERT_EQ(2, message2.repeated_string_size());
+  EXPECT_EQ("a", message2.repeated_string(0));
+  EXPECT_EQ("b", message2.repeated_string(1));
+  ASSERT_EQ(2, message2.repeated_nested_message_size());
+  EXPECT_EQ(7, message2.repeated_nested_message(0).bb());
+  EXPECT_EQ(8, message2.repeated_nested_message(1).bb());
+  ASSERT_EQ(2, message2.repeated_nested_enum_size());
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO, message2.repeated_nested_enum(0));
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message2.repeated_nested_enum(1));
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ADLSwap) {
+  UNITTEST::TestAllTypes message1, message2;
+  TestUtil::SetAllFields(&message1);
+
+  // Note the address of one of the repeated fields, to verify it was swapped
+  // rather than copied.
+  const int32* addr = &message1.repeated_int32().Get(0);
+
+  using std::swap;
+  swap(message1, message2);
+
+  TestUtil::ExpectAllFieldsSet(message2);
+  TestUtil::ExpectClear(message1);
+
+  EXPECT_EQ(addr, &message2.repeated_int32().Get(0));
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, CopyConstructor) {
+  // All set.
+  {
+    UNITTEST::TestAllTypes message1;
+    TestUtil::SetAllFields(&message1);
+
+    UNITTEST::TestAllTypes message2(message1);
+    TestUtil::ExpectAllFieldsSet(message2);
+  }
+
+  // None set.
+  {
+    UNITTEST::TestAllTypes message1;
+    UNITTEST::TestAllTypes message2(message1);
+
+    EXPECT_FALSE(message1.has_optional_string());
+    EXPECT_FALSE(message2.has_optional_string());
+    EXPECT_EQ(message1.optional_string(), message2.optional_string());
+
+    EXPECT_FALSE(message1.has_optional_bytes());
+    EXPECT_FALSE(message2.has_optional_bytes());
+    EXPECT_EQ(message1.optional_bytes(), message2.optional_bytes());
+
+    EXPECT_FALSE(message1.has_optional_nested_message());
+    EXPECT_FALSE(message2.has_optional_nested_message());
+    EXPECT_EQ(&message1.optional_nested_message(),
+              &message2.optional_nested_message());
+
+    EXPECT_FALSE(message1.has_optional_foreign_message());
+    EXPECT_FALSE(message2.has_optional_foreign_message());
+    EXPECT_EQ(&message1.optional_foreign_message(),
+              &message2.optional_foreign_message());
+
+    EXPECT_FALSE(message1.has_optional_import_message());
+    EXPECT_FALSE(message2.has_optional_import_message());
+    EXPECT_EQ(&message1.optional_import_message(),
+              &message2.optional_import_message());
+
+    EXPECT_FALSE(message1.has_optional_public_import_message());
+    EXPECT_FALSE(message2.has_optional_public_import_message());
+    EXPECT_EQ(&message1.optional_public_import_message(),
+              &message2.optional_public_import_message());
+
+    EXPECT_FALSE(message1.has_optional_lazy_message());
+    EXPECT_FALSE(message2.has_optional_lazy_message());
+    EXPECT_EQ(&message1.optional_lazy_message(),
+              &message2.optional_lazy_message());
+  }
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, CopyConstructorWithArenas) {
+  Arena arena;
+  UNITTEST::TestAllTypes* message1 =
+      Arena::CreateMessage<UNITTEST::TestAllTypes>(&arena);
+  TestUtil::SetAllFields(message1);
+
+  UNITTEST::TestAllTypes message2_stack(*message1);
+  TestUtil::ExpectAllFieldsSet(message2_stack);
+
+  std::unique_ptr<UNITTEST::TestAllTypes> message2_heap(
+      new UNITTEST::TestAllTypes(*message1));
+  TestUtil::ExpectAllFieldsSet(*message2_heap);
+
+  arena.Reset();
+
+  // Verify that the copies are still intact.
+  TestUtil::ExpectAllFieldsSet(message2_stack);
+  TestUtil::ExpectAllFieldsSet(*message2_heap);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, CopyAssignmentOperator) {
+  UNITTEST::TestAllTypes message1;
+  TestUtil::SetAllFields(&message1);
+
+  UNITTEST::TestAllTypes message2;
+  message2 = message1;
+  TestUtil::ExpectAllFieldsSet(message2);
+
+  // Make sure that self-assignment does something sane.
+  message2.operator=(message2);
+  TestUtil::ExpectAllFieldsSet(message2);
+}
+
+#if !defined(PROTOBUF_TEST_NO_DESCRIPTORS) || \
+    !defined(GOOGLE_PROTOBUF_NO_RTTI)
+TEST(GENERATED_MESSAGE_TEST_NAME, UpcastCopyFrom) {
+  // Test the CopyFrom method that takes in the generic const Message&
+  // parameter.
+  UNITTEST::TestAllTypes message1, message2;
+
+  TestUtil::SetAllFields(&message1);
+
+  const Message* source = implicit_cast<const Message*>(&message1);
+  message2.CopyFrom(*source);
+
+  TestUtil::ExpectAllFieldsSet(message2);
+}
+#endif
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+
+TEST(GENERATED_MESSAGE_TEST_NAME, DynamicMessageCopyFrom) {
+  // Test copying from a DynamicMessage, which must fall back to using
+  // reflection.
+  UNITTEST::TestAllTypes message2;
+
+  // Construct a new version of the dynamic message via the factory.
+  DynamicMessageFactory factory;
+  std::unique_ptr<Message> message1;
+  message1.reset(factory.GetPrototype(
+                     UNITTEST::TestAllTypes::descriptor())->New());
+
+  TestUtil::ReflectionTester reflection_tester(
+    UNITTEST::TestAllTypes::descriptor());
+  reflection_tester.SetAllFieldsViaReflection(message1.get());
+
+  message2.CopyFrom(*message1);
+
+  TestUtil::ExpectAllFieldsSet(message2);
+}
+
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+
+TEST(GENERATED_MESSAGE_TEST_NAME, NonEmptyMergeFrom) {
+  // Test merging with a non-empty message. Code is a modified form
+  // of that found in google/protobuf/reflection_ops_unittest.cc.
+  UNITTEST::TestAllTypes message1, message2;
+
+  TestUtil::SetAllFields(&message1);
+
+  // This field will test merging into an empty spot.
+  message2.set_optional_int32(message1.optional_int32());
+  message1.clear_optional_int32();
+
+  // This tests overwriting.
+  message2.set_optional_string(message1.optional_string());
+  message1.set_optional_string("something else");
+
+  // This tests concatenating.
+  message2.add_repeated_int32(message1.repeated_int32(1));
+  int32 i = message1.repeated_int32(0);
+  message1.clear_repeated_int32();
+  message1.add_repeated_int32(i);
+
+  message1.MergeFrom(message2);
+
+  TestUtil::ExpectAllFieldsSet(message1);
+}
+
+
+// Test the generated SerializeWithCachedSizesToArray(),
+TEST(GENERATED_MESSAGE_TEST_NAME, SerializationToArray) {
+  UNITTEST::TestAllTypes message1, message2;
+  string data;
+  TestUtil::SetAllFields(&message1);
+  int size = message1.ByteSizeLong();
+  data.resize(size);
+  uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+  uint8* end = message1.SerializeWithCachedSizesToArray(start);
+  EXPECT_EQ(size, end - start);
+  EXPECT_TRUE(message2.ParseFromString(data));
+  TestUtil::ExpectAllFieldsSet(message2);
+
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, PackedFieldsSerializationToArray) {
+  UNITTEST::TestPackedTypes packed_message1, packed_message2;
+  string packed_data;
+  TestUtil::SetPackedFields(&packed_message1);
+  int packed_size = packed_message1.ByteSizeLong();
+  packed_data.resize(packed_size);
+  uint8* start = reinterpret_cast<uint8*>(string_as_array(&packed_data));
+  uint8* end = packed_message1.SerializeWithCachedSizesToArray(start);
+  EXPECT_EQ(packed_size, end - start);
+  EXPECT_TRUE(packed_message2.ParseFromString(packed_data));
+  TestUtil::ExpectPackedFieldsSet(packed_message2);
+}
+
+// Test the generated SerializeWithCachedSizes() by forcing the buffer to write
+// one byte at a time.
+TEST(GENERATED_MESSAGE_TEST_NAME, SerializationToStream) {
+  UNITTEST::TestAllTypes message1, message2;
+  TestUtil::SetAllFields(&message1);
+  int size = message1.ByteSizeLong();
+  string data;
+  data.resize(size);
+  {
+    // Allow the output stream to buffer only one byte at a time.
+    io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+    io::CodedOutputStream output_stream(&array_stream);
+    message1.SerializeWithCachedSizes(&output_stream);
+    EXPECT_FALSE(output_stream.HadError());
+    EXPECT_EQ(size, output_stream.ByteCount());
+  }
+  EXPECT_TRUE(message2.ParseFromString(data));
+  TestUtil::ExpectAllFieldsSet(message2);
+
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, PackedFieldsSerializationToStream) {
+  UNITTEST::TestPackedTypes message1, message2;
+  TestUtil::SetPackedFields(&message1);
+  int size = message1.ByteSizeLong();
+  string data;
+  data.resize(size);
+  {
+    // Allow the output stream to buffer only one byte at a time.
+    io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+    io::CodedOutputStream output_stream(&array_stream);
+    message1.SerializeWithCachedSizes(&output_stream);
+    EXPECT_FALSE(output_stream.HadError());
+    EXPECT_EQ(size, output_stream.ByteCount());
+  }
+  EXPECT_TRUE(message2.ParseFromString(data));
+  TestUtil::ExpectPackedFieldsSet(message2);
+}
+
+
+TEST(GENERATED_MESSAGE_TEST_NAME, Required) {
+  // Test that IsInitialized() returns false if required fields are missing.
+  UNITTEST::TestRequired message;
+
+  EXPECT_FALSE(message.IsInitialized());
+  message.set_a(1);
+  EXPECT_FALSE(message.IsInitialized());
+  message.set_b(2);
+  EXPECT_FALSE(message.IsInitialized());
+  message.set_c(3);
+  EXPECT_TRUE(message.IsInitialized());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, RequiredForeign) {
+  // Test that IsInitialized() returns false if required fields in nested
+  // messages are missing.
+  UNITTEST::TestRequiredForeign message;
+
+  EXPECT_TRUE(message.IsInitialized());
+
+  message.mutable_optional_message();
+  EXPECT_FALSE(message.IsInitialized());
+
+  message.mutable_optional_message()->set_a(1);
+  message.mutable_optional_message()->set_b(2);
+  message.mutable_optional_message()->set_c(3);
+  EXPECT_TRUE(message.IsInitialized());
+
+  message.add_repeated_message();
+  EXPECT_FALSE(message.IsInitialized());
+
+  message.mutable_repeated_message(0)->set_a(1);
+  message.mutable_repeated_message(0)->set_b(2);
+  message.mutable_repeated_message(0)->set_c(3);
+  EXPECT_TRUE(message.IsInitialized());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ForeignNested) {
+  // Test that TestAllTypes::NestedMessage can be embedded directly into
+  // another message.
+  UNITTEST::TestForeignNested message;
+
+  // If this compiles and runs without crashing, it must work.  We have
+  // nothing more to test.
+  UNITTEST::TestAllTypes::NestedMessage* nested =
+    message.mutable_foreign_nested();
+  nested->set_bb(1);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ReallyLargeTagNumber) {
+  // Test that really large tag numbers don't break anything.
+  UNITTEST::TestReallyLargeTagNumber message1, message2;
+  string data;
+
+  // For the most part, if this compiles and runs then we're probably good.
+  // (The most likely cause for failure would be if something were attempting
+  // to allocate a lookup table of some sort using tag numbers as the index.)
+  // We'll try serializing just for fun.
+  message1.set_a(1234);
+  message1.set_bb(5678);
+  message1.SerializeToString(&data);
+  EXPECT_TRUE(message2.ParseFromString(data));
+  EXPECT_EQ(1234, message2.a());
+  EXPECT_EQ(5678, message2.bb());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, MutualRecursion) {
+  // Test that mutually-recursive message types work.
+  UNITTEST::TestMutualRecursionA message;
+  UNITTEST::TestMutualRecursionA* nested = message.mutable_bb()->mutable_a();
+  UNITTEST::TestMutualRecursionA* nested2 = nested->mutable_bb()->mutable_a();
+
+  // Again, if the above compiles and runs, that's all we really have to
+  // test, but just for run we'll check that the system didn't somehow come
+  // up with a pointer loop...
+  EXPECT_NE(&message, nested);
+  EXPECT_NE(&message, nested2);
+  EXPECT_NE(nested, nested2);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, CamelCaseFieldNames) {
+  // This test is mainly checking that the following compiles, which verifies
+  // that the field names were coerced to lower-case.
+  //
+  // Protocol buffers standard style is to use lowercase-with-underscores for
+  // field names.  Some old proto1 .protos unfortunately used camel-case field
+  // names.  In proto1, these names were forced to lower-case.  So, we do the
+  // same thing in proto2.
+
+  UNITTEST::TestCamelCaseFieldNames message;
+
+  message.set_primitivefield(2);
+  message.set_stringfield("foo");
+  message.set_enumfield(UNITTEST::FOREIGN_FOO);
+  message.mutable_messagefield()->set_c(6);
+
+  message.add_repeatedprimitivefield(8);
+  message.add_repeatedstringfield("qux");
+  message.add_repeatedenumfield(UNITTEST::FOREIGN_BAR);
+  message.add_repeatedmessagefield()->set_c(15);
+
+  EXPECT_EQ(2, message.primitivefield());
+  EXPECT_EQ("foo", message.stringfield());
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, message.enumfield());
+  EXPECT_EQ(6, message.messagefield().c());
+
+  EXPECT_EQ(8, message.repeatedprimitivefield(0));
+  EXPECT_EQ("qux", message.repeatedstringfield(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.repeatedenumfield(0));
+  EXPECT_EQ(15, message.repeatedmessagefield(0).c());
+}
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+
+TEST(GENERATED_MESSAGE_TEST_NAME, TestOptimizedForSize) {
+  // We rely on the tests in reflection_ops_unittest and wire_format_unittest
+  // to really test that reflection-based methods work.  Here we are mostly
+  // just making sure that TestOptimizedForSize actually builds and seems to
+  // function.
+
+  UNITTEST::TestOptimizedForSize message, message2;
+  message.set_i(1);
+  message.mutable_msg()->set_c(2);
+  message2.CopyFrom(message);
+  EXPECT_EQ(1, message2.i());
+  EXPECT_EQ(2, message2.msg().c());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, TestEmbedOptimizedForSize) {
+  // Verifies that something optimized for speed can contain something optimized
+  // for size.
+
+  UNITTEST::TestEmbedOptimizedForSize message, message2;
+  message.mutable_optional_message()->set_i(1);
+  message.add_repeated_message()->mutable_msg()->set_c(2);
+  string data;
+  message.SerializeToString(&data);
+  ASSERT_TRUE(message2.ParseFromString(data));
+  EXPECT_EQ(1, message2.optional_message().i());
+  EXPECT_EQ(2, message2.repeated_message(0).msg().c());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, TestSpaceUsed) {
+  UNITTEST::TestAllTypes message1;
+  // sizeof provides a lower bound on SpaceUsedLong().
+  EXPECT_LE(sizeof(UNITTEST::TestAllTypes), message1.SpaceUsedLong());
+  const size_t empty_message_size = message1.SpaceUsedLong();
+
+  // Setting primitive types shouldn't affect the space used.
+  message1.set_optional_int32(123);
+  message1.set_optional_int64(12345);
+  message1.set_optional_uint32(123);
+  message1.set_optional_uint64(12345);
+  EXPECT_EQ(empty_message_size, message1.SpaceUsedLong());
+
+  // On some STL implementations, setting the string to a small value should
+  // only increase SpaceUsedLong() by the size of a string object, though this
+  // is not true everywhere.
+  message1.set_optional_string("abc");
+  EXPECT_LE(empty_message_size + message1.optional_string().size(),
+            message1.SpaceUsedLong());
+
+  // Setting a string to a value larger than the string object itself should
+  // increase SpaceUsedLong(), because it cannot store the value internally.
+  message1.set_optional_string(string(sizeof(string) + 1, 'x'));
+  int min_expected_increase = message1.optional_string().capacity();
+  EXPECT_LE(empty_message_size + min_expected_increase,
+            message1.SpaceUsedLong());
+
+  size_t previous_size = message1.SpaceUsedLong();
+  // Adding an optional message should increase the size by the size of the
+  // nested message type. NestedMessage is simple enough (1 int field) that it
+  // is equal to sizeof(NestedMessage)
+  message1.mutable_optional_nested_message();
+  ASSERT_EQ(sizeof(UNITTEST::TestAllTypes::NestedMessage),
+            message1.optional_nested_message().SpaceUsedLong());
+  EXPECT_EQ(previous_size +
+            sizeof(UNITTEST::TestAllTypes::NestedMessage),
+            message1.SpaceUsedLong());
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, TestOneofSpaceUsed) {
+  UNITTEST::TestOneof2 message1;
+  EXPECT_LE(sizeof(UNITTEST::TestOneof2), message1.SpaceUsedLong());
+
+  const size_t empty_message_size = message1.SpaceUsedLong();
+  // Setting primitive types shouldn't affect the space used.
+  message1.set_foo_int(123);
+  message1.set_bar_int(12345);
+  EXPECT_EQ(empty_message_size, message1.SpaceUsedLong());
+
+  // Setting a string in oneof to a small value should only increase
+  // SpaceUsedLong() by the size of a string object.
+  message1.set_foo_string("abc");
+  EXPECT_LE(empty_message_size + sizeof(string), message1.SpaceUsedLong());
+
+  // Setting a string in oneof to a value larger than the string object itself
+  // should increase SpaceUsedLong(), because it cannot store the value
+  // internally.
+  message1.set_foo_string(string(sizeof(string) + 1, 'x'));
+  int min_expected_increase = message1.foo_string().capacity() +
+      sizeof(string);
+  EXPECT_LE(empty_message_size + min_expected_increase,
+            message1.SpaceUsedLong());
+
+  // Setting a message in oneof should delete the other fields and increase the
+  // size by the size of the nested message type. NestedMessage is simple enough
+  // that it is equal to sizeof(NestedMessage)
+  message1.mutable_foo_message();
+  ASSERT_EQ(sizeof(UNITTEST::TestOneof2::NestedMessage),
+            message1.foo_message().SpaceUsedLong());
+  EXPECT_EQ(empty_message_size +
+            sizeof(UNITTEST::TestOneof2::NestedMessage),
+            message1.SpaceUsedLong());
+}
+
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+
+
+TEST(GENERATED_MESSAGE_TEST_NAME, FieldConstantValues) {
+  UNITTEST::TestRequired message;
+  EXPECT_EQ(UNITTEST::TestAllTypes_NestedMessage::kBbFieldNumber, 1);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kOptionalInt32FieldNumber, 1);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kOptionalgroupFieldNumber, 16);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kOptionalNestedMessageFieldNumber, 18);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kOptionalNestedEnumFieldNumber, 21);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kRepeatedInt32FieldNumber, 31);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kRepeatedgroupFieldNumber, 46);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kRepeatedNestedMessageFieldNumber, 48);
+  EXPECT_EQ(UNITTEST::TestAllTypes::kRepeatedNestedEnumFieldNumber, 51);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ExtensionConstantValues) {
+  EXPECT_EQ(UNITTEST::TestRequired::kSingleFieldNumber, 1000);
+  EXPECT_EQ(UNITTEST::TestRequired::kMultiFieldNumber, 1001);
+  EXPECT_EQ(UNITTEST::kOptionalInt32ExtensionFieldNumber, 1);
+  EXPECT_EQ(UNITTEST::kOptionalgroupExtensionFieldNumber, 16);
+  EXPECT_EQ(UNITTEST::kOptionalNestedMessageExtensionFieldNumber, 18);
+  EXPECT_EQ(UNITTEST::kOptionalNestedEnumExtensionFieldNumber, 21);
+  EXPECT_EQ(UNITTEST::kRepeatedInt32ExtensionFieldNumber, 31);
+  EXPECT_EQ(UNITTEST::kRepeatedgroupExtensionFieldNumber, 46);
+  EXPECT_EQ(UNITTEST::kRepeatedNestedMessageExtensionFieldNumber, 48);
+  EXPECT_EQ(UNITTEST::kRepeatedNestedEnumExtensionFieldNumber, 51);
+}
+
+TEST(GENERATED_MESSAGE_TEST_NAME, ParseFromTruncated) {
+  const string long_string = string(128, 'q');
+  FileDescriptorProto p;
+  p.add_extension()->set_name(long_string);
+  const string msg = p.SerializeAsString();
+  int successful_count = 0;
+  for (int i = 0; i <= msg.size(); i++) {
+    if (p.ParseFromArray(msg.c_str(), i)) {
+      ++successful_count;
+    }
+  }
+  // We don't really care about how often we succeeded.
+  // As long as we didn't crash, we're happy.
+  EXPECT_GE(successful_count, 1);
+}
+
+// ===================================================================
+
+TEST(GENERATED_ENUM_TEST_NAME, EnumValuesAsSwitchCases) {
+  // Test that our nested enum values can be used as switch cases.  This test
+  // doesn't actually do anything, the proof that it works is that it
+  // compiles.
+  int i =0;
+  UNITTEST::TestAllTypes::NestedEnum a = UNITTEST::TestAllTypes::BAR;
+  switch (a) {
+    case UNITTEST::TestAllTypes::FOO:
+      i = 1;
+      break;
+    case UNITTEST::TestAllTypes::BAR:
+      i = 2;
+      break;
+    case UNITTEST::TestAllTypes::BAZ:
+      i = 3;
+      break;
+    case UNITTEST::TestAllTypes::NEG:
+      i = -1;
+      break;
+    // no default case:  We want to make sure the compiler recognizes that
+    //   all cases are covered.  (GCC warns if you do not cover all cases of
+    //   an enum in a switch.)
+  }
+
+  // Token check just for fun.
+  EXPECT_EQ(2, i);
+}
+
+TEST(GENERATED_ENUM_TEST_NAME, IsValidValue) {
+  // Test enum IsValidValue.
+  EXPECT_TRUE(UNITTEST::TestAllTypes::NestedEnum_IsValid(1));
+  EXPECT_TRUE(UNITTEST::TestAllTypes::NestedEnum_IsValid(2));
+  EXPECT_TRUE(UNITTEST::TestAllTypes::NestedEnum_IsValid(3));
+
+  EXPECT_FALSE(UNITTEST::TestAllTypes::NestedEnum_IsValid(0));
+  EXPECT_FALSE(UNITTEST::TestAllTypes::NestedEnum_IsValid(4));
+
+  // Make sure it also works when there are dups.
+  EXPECT_TRUE(UNITTEST::TestEnumWithDupValue_IsValid(1));
+  EXPECT_TRUE(UNITTEST::TestEnumWithDupValue_IsValid(2));
+  EXPECT_TRUE(UNITTEST::TestEnumWithDupValue_IsValid(3));
+
+  EXPECT_FALSE(UNITTEST::TestEnumWithDupValue_IsValid(0));
+  EXPECT_FALSE(UNITTEST::TestEnumWithDupValue_IsValid(4));
+}
+
+TEST(GENERATED_ENUM_TEST_NAME, MinAndMax) {
+  EXPECT_EQ(UNITTEST::TestAllTypes::NEG,
+            UNITTEST::TestAllTypes::NestedEnum_MIN);
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ,
+            UNITTEST::TestAllTypes::NestedEnum_MAX);
+  EXPECT_EQ(4, UNITTEST::TestAllTypes::NestedEnum_ARRAYSIZE);
+
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, UNITTEST::ForeignEnum_MIN);
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, UNITTEST::ForeignEnum_MAX);
+  EXPECT_EQ(7, UNITTEST::ForeignEnum_ARRAYSIZE);
+
+  EXPECT_EQ(1, UNITTEST::TestEnumWithDupValue_MIN);
+  EXPECT_EQ(3, UNITTEST::TestEnumWithDupValue_MAX);
+  EXPECT_EQ(4, UNITTEST::TestEnumWithDupValue_ARRAYSIZE);
+
+  EXPECT_EQ(UNITTEST::SPARSE_E, UNITTEST::TestSparseEnum_MIN);
+  EXPECT_EQ(UNITTEST::SPARSE_C, UNITTEST::TestSparseEnum_MAX);
+  EXPECT_EQ(12589235, UNITTEST::TestSparseEnum_ARRAYSIZE);
+
+  // Make sure we can take the address of _MIN, _MAX and _ARRAYSIZE.
+  void* null_pointer = 0;  // NULL may be integer-type, not pointer-type.
+  EXPECT_NE(null_pointer, &UNITTEST::TestAllTypes::NestedEnum_MIN);
+  EXPECT_NE(null_pointer, &UNITTEST::TestAllTypes::NestedEnum_MAX);
+  EXPECT_NE(null_pointer, &UNITTEST::TestAllTypes::NestedEnum_ARRAYSIZE);
+
+  EXPECT_NE(null_pointer, &UNITTEST::ForeignEnum_MIN);
+  EXPECT_NE(null_pointer, &UNITTEST::ForeignEnum_MAX);
+  EXPECT_NE(null_pointer, &UNITTEST::ForeignEnum_ARRAYSIZE);
+
+  // Make sure we can use _MIN and _MAX as switch cases.
+  switch (UNITTEST::SPARSE_A) {
+    case UNITTEST::TestSparseEnum_MIN:
+    case UNITTEST::TestSparseEnum_MAX:
+      break;
+    default:
+      break;
+  }
+}
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+
+TEST(GENERATED_ENUM_TEST_NAME, Name) {
+  // "Names" in the presence of dup values are a bit arbitrary.
+  EXPECT_EQ("FOO1", UNITTEST::TestEnumWithDupValue_Name(UNITTEST::FOO1));
+  EXPECT_EQ("FOO1", UNITTEST::TestEnumWithDupValue_Name(UNITTEST::FOO2));
+
+  EXPECT_EQ("SPARSE_A", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_A));
+  EXPECT_EQ("SPARSE_B", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_B));
+  EXPECT_EQ("SPARSE_C", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_C));
+  EXPECT_EQ("SPARSE_D", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_D));
+  EXPECT_EQ("SPARSE_E", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_E));
+  EXPECT_EQ("SPARSE_F", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_F));
+  EXPECT_EQ("SPARSE_G", UNITTEST::TestSparseEnum_Name(UNITTEST::SPARSE_G));
+}
+
+TEST(GENERATED_ENUM_TEST_NAME, Parse) {
+  UNITTEST::TestEnumWithDupValue dup_value = UNITTEST::FOO1;
+  EXPECT_TRUE(UNITTEST::TestEnumWithDupValue_Parse("FOO1", &dup_value));
+  EXPECT_EQ(UNITTEST::FOO1, dup_value);
+  EXPECT_TRUE(UNITTEST::TestEnumWithDupValue_Parse("FOO2", &dup_value));
+  EXPECT_EQ(UNITTEST::FOO2, dup_value);
+  EXPECT_FALSE(UNITTEST::TestEnumWithDupValue_Parse("FOO", &dup_value));
+}
+
+TEST(GENERATED_ENUM_TEST_NAME, GetEnumDescriptor) {
+  EXPECT_EQ(UNITTEST::TestAllTypes::NestedEnum_descriptor(),
+            GetEnumDescriptor<UNITTEST::TestAllTypes::NestedEnum>());
+  EXPECT_EQ(UNITTEST::ForeignEnum_descriptor(),
+            GetEnumDescriptor<UNITTEST::ForeignEnum>());
+  EXPECT_EQ(UNITTEST::TestEnumWithDupValue_descriptor(),
+            GetEnumDescriptor<UNITTEST::TestEnumWithDupValue>());
+  EXPECT_EQ(UNITTEST::TestSparseEnum_descriptor(),
+            GetEnumDescriptor<UNITTEST::TestSparseEnum>());
+}
+
+enum NonProtoEnum {
+  kFoo = 1,
+};
+
+TEST(GENERATED_ENUM_TEST_NAME, IsProtoEnumTypeTrait) {
+  EXPECT_TRUE(is_proto_enum<UNITTEST::TestAllTypes::NestedEnum>::value);
+  EXPECT_TRUE(is_proto_enum<UNITTEST::ForeignEnum>::value);
+  EXPECT_TRUE(is_proto_enum<UNITTEST::TestEnumWithDupValue>::value);
+  EXPECT_TRUE(is_proto_enum<UNITTEST::TestSparseEnum>::value);
+
+  EXPECT_FALSE(is_proto_enum<int>::value);
+  EXPECT_FALSE(is_proto_enum<NonProtoEnum>::value);
+}
+
+#endif  // PROTOBUF_TEST_NO_DESCRIPTORS
+
+// ===================================================================
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+
+// Support code for testing services.
+class GENERATED_SERVICE_TEST_NAME : public testing::Test {
+ protected:
+  class MockTestService : public UNITTEST::TestService {
+   public:
+    MockTestService()
+      : called_(false),
+        method_(""),
+        controller_(NULL),
+        request_(NULL),
+        response_(NULL),
+        done_(NULL) {}
+
+    ~MockTestService() {}
+
+    void Reset() { called_ = false; }
+
+    // implements TestService ----------------------------------------
+
+    void Foo(RpcController* controller,
+             const UNITTEST::FooRequest* request,
+             UNITTEST::FooResponse* response,
+             Closure* done) {
+      ASSERT_FALSE(called_);
+      called_ = true;
+      method_ = "Foo";
+      controller_ = controller;
+      request_ = request;
+      response_ = response;
+      done_ = done;
+    }
+
+    void Bar(RpcController* controller,
+             const UNITTEST::BarRequest* request,
+             UNITTEST::BarResponse* response,
+             Closure* done) {
+      ASSERT_FALSE(called_);
+      called_ = true;
+      method_ = "Bar";
+      controller_ = controller;
+      request_ = request;
+      response_ = response;
+      done_ = done;
+    }
+
+    // ---------------------------------------------------------------
+
+    bool called_;
+    string method_;
+    RpcController* controller_;
+    const Message* request_;
+    Message* response_;
+    Closure* done_;
+  };
+
+  class MockRpcChannel : public RpcChannel {
+   public:
+    MockRpcChannel()
+      : called_(false),
+        method_(NULL),
+        controller_(NULL),
+        request_(NULL),
+        response_(NULL),
+        done_(NULL),
+        destroyed_(NULL) {}
+
+    ~MockRpcChannel() {
+      if (destroyed_ != NULL) *destroyed_ = true;
+    }
+
+    void Reset() { called_ = false; }
+
+    // implements TestService ----------------------------------------
+
+    void CallMethod(const MethodDescriptor* method,
+                    RpcController* controller,
+                    const Message* request,
+                    Message* response,
+                    Closure* done) {
+      ASSERT_FALSE(called_);
+      called_ = true;
+      method_ = method;
+      controller_ = controller;
+      request_ = request;
+      response_ = response;
+      done_ = done;
+    }
+
+    // ---------------------------------------------------------------
+
+    bool called_;
+    const MethodDescriptor* method_;
+    RpcController* controller_;
+    const Message* request_;
+    Message* response_;
+    Closure* done_;
+    bool* destroyed_;
+  };
+
+  class MockController : public RpcController {
+   public:
+    void Reset() {
+      ADD_FAILURE() << "Reset() not expected during this test.";
+    }
+    bool Failed() const {
+      ADD_FAILURE() << "Failed() not expected during this test.";
+      return false;
+    }
+    string ErrorText() const {
+      ADD_FAILURE() << "ErrorText() not expected during this test.";
+      return "";
+    }
+    void StartCancel() {
+      ADD_FAILURE() << "StartCancel() not expected during this test.";
+    }
+    void SetFailed(const string& reason) {
+      ADD_FAILURE() << "SetFailed() not expected during this test.";
+    }
+    bool IsCanceled() const {
+      ADD_FAILURE() << "IsCanceled() not expected during this test.";
+      return false;
+    }
+    void NotifyOnCancel(Closure* callback) {
+      ADD_FAILURE() << "NotifyOnCancel() not expected during this test.";
+    }
+  };
+
+  GENERATED_SERVICE_TEST_NAME()
+    : descriptor_(UNITTEST::TestService::descriptor()),
+      foo_(descriptor_->FindMethodByName("Foo")),
+      bar_(descriptor_->FindMethodByName("Bar")),
+      stub_(&mock_channel_),
+      done_(::google::protobuf::NewPermanentCallback(&DoNothing)) {}
+
+  virtual void SetUp() {
+    ASSERT_TRUE(foo_ != NULL);
+    ASSERT_TRUE(bar_ != NULL);
+  }
+
+  const ServiceDescriptor* descriptor_;
+  const MethodDescriptor* foo_;
+  const MethodDescriptor* bar_;
+
+  MockTestService mock_service_;
+  MockController mock_controller_;
+
+  MockRpcChannel mock_channel_;
+  UNITTEST::TestService::Stub stub_;
+
+  // Just so we don't have to re-define these with every test.
+  UNITTEST::FooRequest foo_request_;
+  UNITTEST::FooResponse foo_response_;
+  UNITTEST::BarRequest bar_request_;
+  UNITTEST::BarResponse bar_response_;
+  std::unique_ptr<Closure> done_;
+};
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, GetDescriptor) {
+  // Test that GetDescriptor() works.
+
+  EXPECT_EQ(descriptor_, mock_service_.GetDescriptor());
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, GetChannel) {
+  EXPECT_EQ(&mock_channel_, stub_.channel());
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, OwnsChannel) {
+  MockRpcChannel* channel = new MockRpcChannel;
+  bool destroyed = false;
+  channel->destroyed_ = &destroyed;
+
+  {
+    UNITTEST::TestService::Stub owning_stub(channel,
+                                            Service::STUB_OWNS_CHANNEL);
+    EXPECT_FALSE(destroyed);
+  }
+
+  EXPECT_TRUE(destroyed);
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, CallMethod) {
+  // Test that CallMethod() works.
+
+  // Call Foo() via CallMethod().
+  mock_service_.CallMethod(foo_, &mock_controller_,
+                           &foo_request_, &foo_response_, done_.get());
+
+  ASSERT_TRUE(mock_service_.called_);
+
+  EXPECT_EQ("Foo"            , mock_service_.method_    );
+  EXPECT_EQ(&mock_controller_, mock_service_.controller_);
+  EXPECT_EQ(&foo_request_    , mock_service_.request_   );
+  EXPECT_EQ(&foo_response_   , mock_service_.response_  );
+  EXPECT_EQ(done_.get()      , mock_service_.done_      );
+
+  // Try again, but call Bar() instead.
+  mock_service_.Reset();
+  mock_service_.CallMethod(bar_, &mock_controller_,
+                           &bar_request_, &bar_response_, done_.get());
+
+  ASSERT_TRUE(mock_service_.called_);
+  EXPECT_EQ("Bar", mock_service_.method_);
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, CallMethodTypeFailure) {
+  // Verify death if we call Foo() with Bar's message types.
+
+#ifdef PROTOBUF_HAS_DEATH_TEST  // death tests do not work on Windows yet
+  EXPECT_DEBUG_DEATH(
+    mock_service_.CallMethod(foo_, &mock_controller_,
+                             &foo_request_, &bar_response_, done_.get()),
+    "dynamic_cast");
+
+  mock_service_.Reset();
+  EXPECT_DEBUG_DEATH(
+    mock_service_.CallMethod(foo_, &mock_controller_,
+                             &bar_request_, &foo_response_, done_.get()),
+    "dynamic_cast");
+#endif  // PROTOBUF_HAS_DEATH_TEST
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, GetPrototypes) {
+  // Test Get{Request,Response}Prototype() methods.
+
+  EXPECT_EQ(&UNITTEST::FooRequest::default_instance(),
+            &mock_service_.GetRequestPrototype(foo_));
+  EXPECT_EQ(&UNITTEST::BarRequest::default_instance(),
+            &mock_service_.GetRequestPrototype(bar_));
+
+  EXPECT_EQ(&UNITTEST::FooResponse::default_instance(),
+            &mock_service_.GetResponsePrototype(foo_));
+  EXPECT_EQ(&UNITTEST::BarResponse::default_instance(),
+            &mock_service_.GetResponsePrototype(bar_));
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, Stub) {
+  // Test that the stub class works.
+
+  // Call Foo() via the stub.
+  stub_.Foo(&mock_controller_, &foo_request_, &foo_response_, done_.get());
+
+  ASSERT_TRUE(mock_channel_.called_);
+
+  EXPECT_EQ(foo_             , mock_channel_.method_    );
+  EXPECT_EQ(&mock_controller_, mock_channel_.controller_);
+  EXPECT_EQ(&foo_request_    , mock_channel_.request_   );
+  EXPECT_EQ(&foo_response_   , mock_channel_.response_  );
+  EXPECT_EQ(done_.get()      , mock_channel_.done_      );
+
+  // Call Bar() via the stub.
+  mock_channel_.Reset();
+  stub_.Bar(&mock_controller_, &bar_request_, &bar_response_, done_.get());
+
+  ASSERT_TRUE(mock_channel_.called_);
+  EXPECT_EQ(bar_, mock_channel_.method_);
+}
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, NotImplemented) {
+  // Test that failing to implement a method of a service causes it to fail
+  // with a "not implemented" error message.
+
+  // A service which doesn't implement any methods.
+  class UnimplementedService : public UNITTEST::TestService {
+   public:
+    UnimplementedService() {}
+  };
+
+  UnimplementedService unimplemented_service;
+
+  // And a controller which expects to get a "not implemented" error.
+  class ExpectUnimplementedController : public MockController {
+   public:
+    ExpectUnimplementedController() : called_(false) {}
+
+    void SetFailed(const string& reason) {
+      EXPECT_FALSE(called_);
+      called_ = true;
+      EXPECT_EQ("Method Foo() not implemented.", reason);
+    }
+
+    bool called_;
+  };
+
+  ExpectUnimplementedController controller;
+
+  // Call Foo.
+  unimplemented_service.Foo(&controller, &foo_request_, &foo_response_,
+                            done_.get());
+
+  EXPECT_TRUE(controller.called_);
+}
+
+// ===================================================================
+
+class OneofTest : public testing::Test {
+ protected:
+  virtual void SetUp() {
+  }
+
+  void ExpectEnumCasesWork(const UNITTEST::TestOneof2 &message) {
+    switch (message.foo_case()) {
+      case UNITTEST::TestOneof2::kFooInt:
+        EXPECT_TRUE(message.has_foo_int());
+        break;
+      case UNITTEST::TestOneof2::kFooString:
+        EXPECT_TRUE(message.has_foo_string());
+        break;
+      case UNITTEST::TestOneof2::kFooCord:
+        EXPECT_TRUE(message.has_foo_cord());
+        break;
+      case UNITTEST::TestOneof2::kFooStringPiece:
+        EXPECT_TRUE(message.has_foo_string_piece());
+        break;
+      case UNITTEST::TestOneof2::kFooBytes:
+        EXPECT_TRUE(message.has_foo_bytes());
+        break;
+      case UNITTEST::TestOneof2::kFooEnum:
+        EXPECT_TRUE(message.has_foo_enum());
+        break;
+      case UNITTEST::TestOneof2::kFooMessage:
+        EXPECT_TRUE(message.has_foo_message());
+        break;
+      case UNITTEST::TestOneof2::kFoogroup:
+        EXPECT_TRUE(message.has_foogroup());
+        break;
+      case UNITTEST::TestOneof2::kFooLazyMessage:
+        EXPECT_TRUE(message.has_foo_lazy_message());
+        break;
+      case UNITTEST::TestOneof2::FOO_NOT_SET:
+        break;
+    }
+  }
+};
+
+TEST_F(OneofTest, SettingOneFieldClearsOthers) {
+  UNITTEST::TestOneof2 message;
+
+  message.set_foo_int(123);
+  EXPECT_TRUE(message.has_foo_int());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+  message.set_foo_string("foo");
+  EXPECT_TRUE(message.has_foo_string());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+
+  message.set_foo_bytes("qux");
+  EXPECT_TRUE(message.has_foo_bytes());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+  message.set_foo_enum(UNITTEST::TestOneof2::FOO);
+  EXPECT_TRUE(message.has_foo_enum());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+  message.mutable_foo_message()->set_qux_int(234);
+  EXPECT_TRUE(message.has_foo_message());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+  message.mutable_foogroup()->set_a(345);
+  EXPECT_TRUE(message.has_foogroup());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+
+
+  // we repeat this because we didn't test if this properly clears other fields
+  // at the beginning.
+  message.set_foo_int(123);
+  EXPECT_TRUE(message.has_foo_int());
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message);
+}
+
+TEST_F(OneofTest, EnumCases) {
+  UNITTEST::TestOneof2 message;
+
+  message.set_foo_int(123);
+  ExpectEnumCasesWork(message);
+  message.set_foo_string("foo");
+  ExpectEnumCasesWork(message);
+  message.set_foo_bytes("qux");
+  ExpectEnumCasesWork(message);
+  message.set_foo_enum(UNITTEST::TestOneof2::FOO);
+  ExpectEnumCasesWork(message);
+  message.mutable_foo_message()->set_qux_int(234);
+  ExpectEnumCasesWork(message);
+  message.mutable_foogroup()->set_a(345);
+  ExpectEnumCasesWork(message);
+}
+
+TEST_F(OneofTest, PrimitiveType) {
+  UNITTEST::TestOneof2 message;
+  // Unset field returns default value
+  EXPECT_EQ(message.foo_int(), 0);
+
+  message.set_foo_int(123);
+  EXPECT_TRUE(message.has_foo_int());
+  EXPECT_EQ(message.foo_int(), 123);
+  message.clear_foo_int();
+  EXPECT_FALSE(message.has_foo_int());
+}
+
+TEST_F(OneofTest, EnumType) {
+  UNITTEST::TestOneof2 message;
+  // Unset field returns default value
+  EXPECT_EQ(message.foo_enum(), 1);
+
+  message.set_foo_enum(UNITTEST::TestOneof2::FOO);
+  EXPECT_TRUE(message.has_foo_enum());
+  EXPECT_EQ(message.foo_enum(), UNITTEST::TestOneof2::FOO);
+  message.clear_foo_enum();
+  EXPECT_FALSE(message.has_foo_enum());
+}
+
+TEST_F(OneofTest, SetString) {
+  // Check that setting a string field in various ways works
+  UNITTEST::TestOneof2 message;
+
+  // Unset field returns default value
+  EXPECT_EQ(message.foo_string(), "");
+
+  message.set_foo_string("foo");
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "foo");
+  message.clear_foo_string();
+  EXPECT_FALSE(message.has_foo_string());
+
+  message.set_foo_string(string("bar"));
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "bar");
+  message.clear_foo_string();
+  EXPECT_FALSE(message.has_foo_string());
+
+
+  message.set_foo_string("qux", 3);
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "qux");
+  message.clear_foo_string();
+  EXPECT_FALSE(message.has_foo_string());
+
+  message.mutable_foo_string()->assign("quux");
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "quux");
+  message.clear_foo_string();
+  EXPECT_FALSE(message.has_foo_string());
+
+  message.set_foo_string("corge");
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "corge");
+  message.clear_foo_string();
+  EXPECT_FALSE(message.has_foo_string());
+}
+
+TEST_F(OneofTest, ReleaseString) {
+  // Check that release_foo() starts out NULL, and gives us a value
+  // that we can delete after it's been set.
+  UNITTEST::TestOneof2 message;
+
+  EXPECT_EQ(NULL, message.release_foo_string());
+  EXPECT_FALSE(message.has_foo_string());
+
+  message.set_foo_string("blah");
+  EXPECT_TRUE(message.has_foo_string());
+  std::unique_ptr<string> str(message.release_foo_string());
+  EXPECT_FALSE(message.has_foo_string());
+  ASSERT_TRUE(str != NULL);
+  EXPECT_EQ("blah", *str);
+
+  EXPECT_EQ(NULL, message.release_foo_string());
+  EXPECT_FALSE(message.has_foo_string());
+}
+
+TEST_F(OneofTest, SetAllocatedString) {
+  // Check that set_allocated_foo() works for strings.
+  UNITTEST::TestOneof2 message;
+
+  EXPECT_FALSE(message.has_foo_string());
+  const string kHello("hello");
+  message.set_foo_string(kHello);
+  EXPECT_TRUE(message.has_foo_string());
+
+  message.set_allocated_foo_string(NULL);
+  EXPECT_FALSE(message.has_foo_string());
+  EXPECT_EQ("", message.foo_string());
+
+  message.set_allocated_foo_string(new string(kHello));
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(kHello, message.foo_string());
+}
+
+
+TEST_F(OneofTest, SetMessage) {
+  // Check that setting a message field works
+  UNITTEST::TestOneof2 message;
+
+  // Unset field returns default instance
+  EXPECT_EQ(&message.foo_message(),
+            &UNITTEST::TestOneof2_NestedMessage::default_instance());
+  EXPECT_EQ(message.foo_message().qux_int(), 0);
+
+  message.mutable_foo_message()->set_qux_int(234);
+  EXPECT_TRUE(message.has_foo_message());
+  EXPECT_EQ(message.foo_message().qux_int(), 234);
+  message.clear_foo_message();
+  EXPECT_FALSE(message.has_foo_message());
+}
+
+TEST_F(OneofTest, ReleaseMessage) {
+  // Check that release_foo() starts out NULL, and gives us a value
+  // that we can delete after it's been set.
+  UNITTEST::TestOneof2 message;
+
+  EXPECT_EQ(NULL, message.release_foo_message());
+  EXPECT_FALSE(message.has_foo_message());
+
+  message.mutable_foo_message()->set_qux_int(1);
+  EXPECT_TRUE(message.has_foo_message());
+  std::unique_ptr<UNITTEST::TestOneof2_NestedMessage> mes(
+      message.release_foo_message());
+  EXPECT_FALSE(message.has_foo_message());
+  ASSERT_TRUE(mes != NULL);
+  EXPECT_EQ(1, mes->qux_int());
+
+  EXPECT_EQ(NULL, message.release_foo_message());
+  EXPECT_FALSE(message.has_foo_message());
+}
+
+TEST_F(OneofTest, SetAllocatedMessage) {
+  // Check that set_allocated_foo() works for messages.
+  UNITTEST::TestOneof2 message;
+
+  EXPECT_FALSE(message.has_foo_message());
+
+  message.mutable_foo_message()->set_qux_int(1);
+  EXPECT_TRUE(message.has_foo_message());
+
+  message.set_allocated_foo_message(NULL);
+  EXPECT_FALSE(message.has_foo_message());
+  EXPECT_EQ(&message.foo_message(),
+            &UNITTEST::TestOneof2_NestedMessage::default_instance());
+
+  message.mutable_foo_message()->set_qux_int(1);
+  UNITTEST::TestOneof2_NestedMessage* mes = message.release_foo_message();
+  ASSERT_TRUE(mes != NULL);
+  EXPECT_FALSE(message.has_foo_message());
+
+  message.set_allocated_foo_message(mes);
+  EXPECT_TRUE(message.has_foo_message());
+  EXPECT_EQ(1, message.foo_message().qux_int());
+}
+
+
+TEST_F(OneofTest, Clear) {
+  UNITTEST::TestOneof2 message;
+
+  message.set_foo_int(1);
+  EXPECT_TRUE(message.has_foo_int());
+  message.clear_foo_int();
+  EXPECT_FALSE(message.has_foo_int());
+}
+
+TEST_F(OneofTest, Defaults) {
+  UNITTEST::TestOneof2 message;
+
+  EXPECT_FALSE(message.has_foo_int());
+  EXPECT_EQ(message.foo_int(), 0);
+
+  EXPECT_FALSE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "");
+
+
+  EXPECT_FALSE(message.has_foo_bytes());
+  EXPECT_EQ(message.foo_bytes(), "");
+
+  EXPECT_FALSE(message.has_foo_enum());
+  EXPECT_EQ(message.foo_enum(), 1);
+
+  EXPECT_FALSE(message.has_foo_message());
+  EXPECT_EQ(message.foo_message().qux_int(), 0);
+
+  EXPECT_FALSE(message.has_foogroup());
+  EXPECT_EQ(message.foogroup().a(), 0);
+
+
+  EXPECT_FALSE(message.has_bar_int());
+  EXPECT_EQ(message.bar_int(), 5);
+
+  EXPECT_FALSE(message.has_bar_string());
+  EXPECT_EQ(message.bar_string(), "STRING");
+
+
+  EXPECT_FALSE(message.has_bar_bytes());
+  EXPECT_EQ(message.bar_bytes(), "BYTES");
+
+  EXPECT_FALSE(message.has_bar_enum());
+  EXPECT_EQ(message.bar_enum(), 2);
+}
+
+TEST_F(OneofTest, SwapWithEmpty) {
+  UNITTEST::TestOneof2 message1, message2;
+  message1.set_foo_string("FOO");
+  EXPECT_TRUE(message1.has_foo_string());
+  message1.Swap(&message2);
+  EXPECT_FALSE(message1.has_foo_string());
+  EXPECT_TRUE(message2.has_foo_string());
+  EXPECT_EQ(message2.foo_string(), "FOO");
+}
+
+TEST_F(OneofTest, SwapWithSelf) {
+  UNITTEST::TestOneof2 message;
+  message.set_foo_string("FOO");
+  EXPECT_TRUE(message.has_foo_string());
+  message.Swap(&message);
+  EXPECT_TRUE(message.has_foo_string());
+  EXPECT_EQ(message.foo_string(), "FOO");
+}
+
+TEST_F(OneofTest, SwapBothHasFields) {
+  UNITTEST::TestOneof2 message1, message2;
+
+  message1.set_foo_string("FOO");
+  EXPECT_TRUE(message1.has_foo_string());
+  message2.mutable_foo_message()->set_qux_int(1);
+  EXPECT_TRUE(message2.has_foo_message());
+
+  message1.Swap(&message2);
+  EXPECT_FALSE(message1.has_foo_string());
+  EXPECT_FALSE(message2.has_foo_message());
+  EXPECT_TRUE(message1.has_foo_message());
+  EXPECT_EQ(message1.foo_message().qux_int(), 1);
+  EXPECT_TRUE(message2.has_foo_string());
+  EXPECT_EQ(message2.foo_string(), "FOO");
+}
+
+TEST_F(OneofTest, CopyConstructor) {
+  UNITTEST::TestOneof2 message1;
+  message1.set_foo_bytes("FOO");
+
+  UNITTEST::TestOneof2 message2(message1);
+  EXPECT_TRUE(message2.has_foo_bytes());
+  EXPECT_EQ(message2.foo_bytes(), "FOO");
+}
+
+TEST_F(OneofTest, CopyFrom) {
+  UNITTEST::TestOneof2 message1, message2;
+  message1.set_foo_enum(UNITTEST::TestOneof2::BAR);
+  EXPECT_TRUE(message1.has_foo_enum());
+
+  message2.CopyFrom(message1);
+  EXPECT_TRUE(message2.has_foo_enum());
+  EXPECT_EQ(message2.foo_enum(), UNITTEST::TestOneof2::BAR);
+
+  // Copying from self should be a no-op.
+  message2.CopyFrom(message2);
+  EXPECT_TRUE(message2.has_foo_enum());
+  EXPECT_EQ(message2.foo_enum(), UNITTEST::TestOneof2::BAR);
+}
+
+TEST_F(OneofTest, CopyAssignmentOperator) {
+  UNITTEST::TestOneof2 message1;
+  message1.mutable_foo_message()->set_qux_int(123);
+  EXPECT_TRUE(message1.has_foo_message());
+
+  UNITTEST::TestOneof2 message2;
+  message2 = message1;
+  EXPECT_EQ(message2.foo_message().qux_int(), 123);
+
+  // Make sure that self-assignment does something sane.
+  message2 = message2;
+  EXPECT_EQ(message2.foo_message().qux_int(), 123);
+}
+
+TEST_F(OneofTest, UpcastCopyFrom) {
+  // Test the CopyFrom method that takes in the generic const Message&
+  // parameter.
+  UNITTEST::TestOneof2 message1, message2;
+  message1.mutable_foogroup()->set_a(123);
+  EXPECT_TRUE(message1.has_foogroup());
+
+  const Message* source = implicit_cast<const Message*>(&message1);
+  message2.CopyFrom(*source);
+
+  EXPECT_TRUE(message2.has_foogroup());
+  EXPECT_EQ(message2.foogroup().a(), 123);
+}
+
+// Test the generated SerializeWithCachedSizesToArray(),
+// This indirectly tests MergePartialFromCodedStream()
+// We have to test each field type separately because we cannot set them at the
+// same time
+TEST_F(OneofTest, SerializationToArray) {
+  // Primitive type
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_int(123);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_int(), 123);
+  }
+
+  // String
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_string("foo");
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_string(), "foo");
+  }
+
+
+  // Bytes
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_bytes("qux");
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_bytes(), "qux");
+  }
+
+  // Enum
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_enum(UNITTEST::TestOneof2::FOO);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_enum(), UNITTEST::TestOneof2::FOO);
+  }
+
+  // Message
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.mutable_foo_message()->set_qux_int(234);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_message().qux_int(), 234);
+  }
+
+  // Group
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.mutable_foogroup()->set_a(345);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+    uint8* start = reinterpret_cast<uint8*>(string_as_array(&data));
+    uint8* end = message1.SerializeWithCachedSizesToArray(start);
+    EXPECT_EQ(size, end - start);
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foogroup().a(), 345);
+  }
+
+}
+
+// Test the generated SerializeWithCachedSizes() by forcing the buffer to write
+// one byte at a time.
+// This indirectly tests MergePartialFromCodedStream()
+// We have to test each field type separately because we cannot set them at the
+// same time
+TEST_F(OneofTest, SerializationToStream) {
+  // Primitive type
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_int(123);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_int(), 123);
+  }
+
+  // String
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_string("foo");
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_string(), "foo");
+  }
+
+
+  // Bytes
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_bytes("qux");
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_bytes(), "qux");
+  }
+
+  // Enum
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.set_foo_enum(UNITTEST::TestOneof2::FOO);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_enum(), UNITTEST::TestOneof2::FOO);
+  }
+
+  // Message
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.mutable_foo_message()->set_qux_int(234);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foo_message().qux_int(), 234);
+  }
+
+  // Group
+  {
+    UNITTEST::TestOneof2 message1, message2;
+    string data;
+    message1.mutable_foogroup()->set_a(345);
+    int size = message1.ByteSizeLong();
+    data.resize(size);
+
+    {
+      // Allow the output stream to buffer only one byte at a time.
+      io::ArrayOutputStream array_stream(string_as_array(&data), size, 1);
+      io::CodedOutputStream output_stream(&array_stream);
+      message1.SerializeWithCachedSizes(&output_stream);
+      EXPECT_FALSE(output_stream.HadError());
+      EXPECT_EQ(size, output_stream.ByteCount());
+    }
+
+    EXPECT_TRUE(message2.ParseFromString(data));
+    EXPECT_EQ(message2.foogroup().a(), 345);
+  }
+
+}
+
+TEST_F(OneofTest, MergeFrom) {
+  UNITTEST::TestOneof2 message1, message2;
+
+  message1.set_foo_int(123);
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foo_int());
+  EXPECT_EQ(message2.foo_int(), 123);
+
+  message1.set_foo_string("foo");
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foo_string());
+  EXPECT_EQ(message2.foo_string(), "foo");
+
+
+  message1.set_foo_bytes("qux");
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foo_bytes());
+  EXPECT_EQ(message2.foo_bytes(), "qux");
+
+  message1.set_foo_enum(UNITTEST::TestOneof2::FOO);
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foo_enum());
+  EXPECT_EQ(message2.foo_enum(), UNITTEST::TestOneof2::FOO);
+
+  message1.mutable_foo_message()->set_qux_int(234);
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foo_message());
+  EXPECT_EQ(message2.foo_message().qux_int(), 234);
+
+  message1.mutable_foogroup()->set_a(345);
+  message2.MergeFrom(message1);
+  TestUtil::ExpectAtMostOneFieldSetInOneof(message2);
+  EXPECT_TRUE(message2.has_foogroup());
+  EXPECT_EQ(message2.foogroup().a(), 345);
+
+}
+
+TEST(HELPERS_TEST_NAME, TestSCC) {
+  UNITTEST::TestMutualRecursionA a;
+  SCCAnalyzer scc_analyzer((Options()));
+  const SCC* scc = scc_analyzer.GetSCC(a.GetDescriptor());
+  std::vector<string> names;
+  for (int i = 0; i < scc->descriptors.size(); i++) {
+    names.push_back(scc->descriptors[i]->full_name());
+  }
+  string package = a.GetDescriptor()->file()->package();
+  ASSERT_EQ(names.size(), 4);
+  std::sort(names.begin(), names.end());
+  EXPECT_EQ(names[0], package + ".TestMutualRecursionA");
+  EXPECT_EQ(names[1], package + ".TestMutualRecursionA.SubGroup");
+  EXPECT_EQ(names[2], package + ".TestMutualRecursionA.SubMessage");
+  EXPECT_EQ(names[3], package + ".TestMutualRecursionB");
+
+  MessageAnalysis result = scc_analyzer.GetSCCAnalysis(scc);
+  EXPECT_EQ(result.is_recursive, true);
+  EXPECT_EQ(result.contains_required, false);
+  EXPECT_EQ(result.contains_cord, true);  // TestAllTypes
+  EXPECT_EQ(result.contains_extension, false);  // TestAllTypes
+}
+
+TEST(HELPERS_TEST_NAME, TestSCCAnalysis) {
+  {
+    UNITTEST::TestRecursiveMessage msg;
+    SCCAnalyzer scc_analyzer((Options()));
+    const SCC* scc = scc_analyzer.GetSCC(msg.GetDescriptor());
+    MessageAnalysis result = scc_analyzer.GetSCCAnalysis(scc);
+    EXPECT_EQ(result.is_recursive, true);
+    EXPECT_EQ(result.contains_required, false);
+    EXPECT_EQ(result.contains_cord, false);
+    EXPECT_EQ(result.contains_extension, false);
+  }
+  {
+    UNITTEST::TestAllExtensions msg;
+    SCCAnalyzer scc_analyzer((Options()));
+    const SCC* scc = scc_analyzer.GetSCC(msg.GetDescriptor());
+    MessageAnalysis result = scc_analyzer.GetSCCAnalysis(scc);
+    EXPECT_EQ(result.is_recursive, false);
+    EXPECT_EQ(result.contains_required, false);
+    EXPECT_EQ(result.contains_cord, false);
+    EXPECT_EQ(result.contains_extension, true);
+  }
+  {
+    UNITTEST::TestRequired msg;
+    SCCAnalyzer scc_analyzer((Options()));
+    const SCC* scc = scc_analyzer.GetSCC(msg.GetDescriptor());
+    MessageAnalysis result = scc_analyzer.GetSCCAnalysis(scc);
+    EXPECT_EQ(result.is_recursive, false);
+    EXPECT_EQ(result.contains_required, true);
+    EXPECT_EQ(result.contains_cord, false);
+    EXPECT_EQ(result.contains_extension, false);
+  }
+}
+
+}  // namespace cpp_unittest
+}  // namespace cpp
+}  // namespace compiler
+
+namespace no_generic_services_test {
+  // Verify that no class called "TestService" was defined in
+  // unittest_no_generic_services.pb.h by defining a different type by the same
+  // name.  If such a service was generated, this will not compile.
+  struct TestService {
+    int i;
+  };
+}
+
+namespace compiler {
+namespace cpp {
+namespace cpp_unittest {
+
+TEST_F(GENERATED_SERVICE_TEST_NAME, NoGenericServices) {
+  // Verify that non-services in unittest_no_generic_services.proto were
+  // generated.
+  no_generic_services_test::TestMessage message;
+  message.set_a(1);
+  message.SetExtension(no_generic_services_test::test_extension, 123);
+  no_generic_services_test::TestEnum e = no_generic_services_test::FOO;
+  EXPECT_EQ(e, 1);
+
+  // Verify that a ServiceDescriptor is generated for the service even if the
+  // class itself is not.
+  const FileDescriptor* file =
+      no_generic_services_test::TestMessage::descriptor()->file();
+
+  ASSERT_EQ(1, file->service_count());
+  EXPECT_EQ("TestService", file->service(0)->name());
+  ASSERT_EQ(1, file->service(0)->method_count());
+  EXPECT_EQ("Foo", file->service(0)->method(0)->name());
+}
+
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+
+// ===================================================================
+
+// This test must run last.  It verifies that descriptors were or were not
+// initialized depending on whether PROTOBUF_TEST_NO_DESCRIPTORS was defined.
+// When this is defined, we skip all tests which are expected to trigger
+// descriptor initialization.  This verifies that everything else still works
+// if descriptors are not initialized.
+TEST(DESCRIPTOR_INIT_TEST_NAME, Initialized) {
+#ifdef PROTOBUF_TEST_NO_DESCRIPTORS
+  bool should_have_descriptors = false;
+#else
+  bool should_have_descriptors = true;
+#endif
+
+  EXPECT_EQ(should_have_descriptors,
+    DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      UNITTEST_PROTO_PATH));
+}
+
+}  // namespace cpp_unittest
+
+}  // namespace cpp
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/compiler/cpp/metadata_test.cc b/src/google/protobuf/compiler/cpp/metadata_test.cc
index 03f6b12b..2ad4edd2 100644
--- a/src/google/protobuf/compiler/cpp/metadata_test.cc
+++ b/src/google/protobuf/compiler/cpp/metadata_test.cc
@@ -29,16 +29,11 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/cpp/cpp_helpers.h>
 #include <google/protobuf/compiler/cpp/cpp_generator.h>
+#include <google/protobuf/compiler/annotation_test_util.h>
 #include <google/protobuf/compiler/command_line_interface.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
 
 #include <google/protobuf/testing/file.h>
@@ -47,37 +42,15 @@
 #include <gtest/gtest.h>
 
 namespace google {
+namespace atu = ::google::protobuf::compiler::annotation_test_util;
+
 namespace protobuf {
 namespace compiler {
 namespace cpp {
 namespace {
 
-// A CodeGenerator that captures the FileDescriptor it's passed as a
-// FileDescriptorProto.
-class DescriptorCapturingGenerator : public CodeGenerator {
- public:
-  // Does not own file; file must outlive the Generator.
-  explicit DescriptorCapturingGenerator(FileDescriptorProto* file)
-      : file_(file) {}
-
-  virtual bool Generate(const FileDescriptor* file, const string& parameter,
-                        GeneratorContext* context, string* error) const {
-    file->CopyTo(file_);
-    return true;
-  }
-
- private:
-  FileDescriptorProto* file_;
-};
-
 class CppMetadataTest : public ::testing::Test {
  public:
-  // Adds a file with name `filename` and content `data`.
-  void AddFile(const string& filename, const string& data) {
-    GOOGLE_CHECK_OK(File::SetContents(TestTempDir() + "/" + filename, data,
-                               true));
-  }
-
   // Tries to capture a FileDescriptorProto, GeneratedCodeInfo, and output
   // code from the previously added file with name `filename`. Returns true on
   // success. If pb_h is non-null, expects a .pb.h and a .pb.h.meta (copied to
@@ -87,26 +60,19 @@ class CppMetadataTest : public ::testing::Test {
                        string* proto_h, GeneratedCodeInfo* proto_h_info,
                        string* pb_cc) {
     google::protobuf::compiler::CommandLineInterface cli;
-    cli.SetInputsAreProtoPathRelative(true);
-
     CppGenerator cpp_generator;
-    DescriptorCapturingGenerator capturing_generator(file);
     cli.RegisterGenerator("--cpp_out", &cpp_generator, "");
-    cli.RegisterGenerator("--capture_out", &capturing_generator, "");
-
-    string proto_path = "-I" + TestTempDir();
     string cpp_out =
         "--cpp_out=annotate_headers=true,"
         "annotation_pragma_name=pragma_name,"
         "annotation_guard_name=guard_name:" +
         TestTempDir();
-    string capture_out = "--capture_out=" + TestTempDir();
 
-    const char* argv[] = {"protoc", proto_path.c_str(), cpp_out.c_str(),
-                          capture_out.c_str(), filename.c_str()};
+    const bool result =
+        atu::RunProtoCompiler(filename, cpp_out, &cli, file);
 
-    if (cli.Run(5, argv) != 0) {
-      return false;
+    if (!result) {
+      return result;
     }
 
     string output_base = TestTempDir() + "/" + StripProto(filename);
@@ -119,7 +85,7 @@ class CppMetadataTest : public ::testing::Test {
     if (pb_h != NULL && pb_h_info != NULL) {
       GOOGLE_CHECK_OK(
           File::GetContents(output_base + ".pb.h", pb_h, true));
-      if (!DecodeMetadata(output_base + ".pb.h.meta", pb_h_info)) {
+      if (!atu::DecodeMetadata(output_base + ".pb.h.meta", pb_h_info)) {
         return false;
       }
     }
@@ -127,23 +93,13 @@ class CppMetadataTest : public ::testing::Test {
     if (proto_h != NULL && proto_h_info != NULL) {
       GOOGLE_CHECK_OK(File::GetContents(output_base + ".proto.h", proto_h,
                                  true));
-      if (!DecodeMetadata(output_base + ".proto.h.meta", proto_h_info)) {
+      if (!atu::DecodeMetadata(output_base + ".proto.h.meta", proto_h_info)) {
         return false;
       }
     }
 
     return true;
   }
-
- private:
-  // Decodes GeneratedCodeInfo stored in path and copies it to info.
-  // Returns true on success.
-  bool DecodeMetadata(const string& path, GeneratedCodeInfo* info) {
-    string data;
-    GOOGLE_CHECK_OK(File::GetContents(path, &data, true));
-    io::ArrayInputStream input(data.data(), data.size());
-    return info->ParseFromZeroCopyStream(&input);
-  }
 };
 
 const char kSmallTestFile[] =
@@ -152,48 +108,11 @@ const char kSmallTestFile[] =
     "enum Enum { VALUE = 0; }\n"
     "message Message { }\n";
 
-// Finds the Annotation for a given source file and path (or returns null if it
-// couldn't).
-const GeneratedCodeInfo::Annotation* FindAnnotationOnPath(
-    const GeneratedCodeInfo& info, const string& source_file,
-    const std::vector<int>& path) {
-  for (int i = 0; i < info.annotation_size(); ++i) {
-    const GeneratedCodeInfo::Annotation* annotation = &info.annotation(i);
-    if (annotation->source_file() != source_file ||
-        annotation->path_size() != path.size()) {
-      continue;
-    }
-    int node = 0;
-    for (; node < path.size(); ++node) {
-      if (annotation->path(node) != path[node]) {
-        break;
-      }
-    }
-    if (node == path.size()) {
-      return annotation;
-    }
-  }
-  return NULL;
-}
-
-// Returns true if the provided annotation covers a given substring in
-// file_content.
-bool AnnotationMatchesSubstring(const string& file_content,
-                                const GeneratedCodeInfo::Annotation* annotation,
-                                const string& expected_text) {
-  uint32 begin = annotation->begin();
-  uint32 end = annotation->end();
-  if (end < begin || end > file_content.size()) {
-    return false;
-  }
-  return file_content.substr(begin, end - begin) == expected_text;
-}
-
 TEST_F(CppMetadataTest, CapturesEnumNames) {
   FileDescriptorProto file;
   GeneratedCodeInfo info;
   string pb_h;
-  AddFile("test.proto", kSmallTestFile);
+  atu::AddFile("test.proto", kSmallTestFile);
   EXPECT_TRUE(
       CaptureMetadata("test.proto", &file, &pb_h, &info, NULL, NULL, NULL));
   EXPECT_EQ("Enum", file.enum_type(0).name());
@@ -201,16 +120,16 @@ TEST_F(CppMetadataTest, CapturesEnumNames) {
   enum_path.push_back(FileDescriptorProto::kEnumTypeFieldNumber);
   enum_path.push_back(0);
   const GeneratedCodeInfo::Annotation* enum_annotation =
-      FindAnnotationOnPath(info, "test.proto", enum_path);
+      atu::FindAnnotationOnPath(info, "test.proto", enum_path);
   EXPECT_TRUE(NULL != enum_annotation);
-  EXPECT_TRUE(AnnotationMatchesSubstring(pb_h, enum_annotation, "Enum"));
+  EXPECT_TRUE(atu::AnnotationMatchesSubstring(pb_h, enum_annotation, "Enum"));
 }
 
 TEST_F(CppMetadataTest, AddsPragma) {
   FileDescriptorProto file;
   GeneratedCodeInfo info;
   string pb_h;
-  AddFile("test.proto", kSmallTestFile);
+  atu::AddFile("test.proto", kSmallTestFile);
   EXPECT_TRUE(
       CaptureMetadata("test.proto", &file, &pb_h, &info, NULL, NULL, NULL));
   EXPECT_TRUE(pb_h.find("#ifdef guard_name") != string::npos);
@@ -222,7 +141,7 @@ TEST_F(CppMetadataTest, CapturesMessageNames) {
   FileDescriptorProto file;
   GeneratedCodeInfo info;
   string pb_h;
-  AddFile("test.proto", kSmallTestFile);
+  atu::AddFile("test.proto", kSmallTestFile);
   EXPECT_TRUE(
       CaptureMetadata("test.proto", &file, &pb_h, &info, NULL, NULL, NULL));
   EXPECT_EQ("Message", file.message_type(0).name());
@@ -230,9 +149,10 @@ TEST_F(CppMetadataTest, CapturesMessageNames) {
   message_path.push_back(FileDescriptorProto::kMessageTypeFieldNumber);
   message_path.push_back(0);
   const GeneratedCodeInfo::Annotation* message_annotation =
-      FindAnnotationOnPath(info, "test.proto", message_path);
+      atu::FindAnnotationOnPath(info, "test.proto", message_path);
   EXPECT_TRUE(NULL != message_annotation);
-  EXPECT_TRUE(AnnotationMatchesSubstring(pb_h, message_annotation, "Message"));
+  EXPECT_TRUE(
+      atu::AnnotationMatchesSubstring(pb_h, message_annotation, "Message"));
 }
 
 }  // namespace
diff --git a/src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc b/src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc
index c1f90e41..8c38e52f 100644
--- a/src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_bootstrap_unittest.cc
@@ -34,8 +34,8 @@
 // generated automatically at build time.
 //
 // If this test fails, run the script
-// "generate_descriptor_proto.sh" and add
-// csharp/src/Google.Protobuf/Reflection/Descriptor.cs to your changelist.
+// "generate_descriptor_proto.sh" and add the changed files under
+// csharp/src/ to your changelist.
 
 #include <map>
 
@@ -91,7 +91,8 @@ class MockGeneratorContext : public GeneratorContext {
     string actual_contents;
     GOOGLE_CHECK_OK(
         File::GetContents(TestSourceDir() + "/" + physical_filename,
-                          &actual_contents, true));
+                          &actual_contents, true))
+        << "Unable to get " << physical_filename;
     EXPECT_TRUE(actual_contents == *expected_contents)
       << physical_filename << " needs to be regenerated.  Please run "
          "generate_descriptor_proto.sh. Then add this file "
@@ -112,26 +113,83 @@ class MockGeneratorContext : public GeneratorContext {
   std::map<string, string*> files_;
 };
 
+class GenerateAndTest {
+ public:
+  GenerateAndTest() {}
+  void Run(const FileDescriptor* proto_file, string file1, string file2) {
+    ASSERT_TRUE(proto_file != NULL) << TestSourceDir();
+    ASSERT_TRUE(generator_.Generate(proto_file, parameter_,
+                                    &context_, &error_));
+    context_.ExpectFileMatches(file1, file2);
+  }
+  void SetParameter(string parameter) {
+    parameter_ = parameter;
+  }
+
+ private:
+  Generator generator_;
+  MockGeneratorContext context_;
+  string error_;
+  string parameter_;
+};
+
 TEST(CsharpBootstrapTest, GeneratedCsharpDescriptorMatches) {
+  // Skip this whole test if the csharp directory doesn't exist (i.e., a C++11
+  // only distribution).
+  string descriptor_file_name =
+      "../csharp/src/Google.Protobuf/Reflection/Descriptor.cs";
+  if (!File::Exists(TestSourceDir() + "/" + descriptor_file_name)) {
+    return;
+  }
+
   MockErrorCollector error_collector;
   DiskSourceTree source_tree;
-  source_tree.MapPath("", TestSourceDir());
   Importer importer(&source_tree, &error_collector);
-  const FileDescriptor* proto_file =
-    importer.Import("google/protobuf/descriptor.proto");
+  GenerateAndTest generate_test;
+
+  generate_test.SetParameter("base_namespace=Google.Protobuf");
+  source_tree.MapPath("", TestSourceDir());
+  generate_test.Run(importer.Import("google/protobuf/descriptor.proto"),
+                    "Reflection/Descriptor.cs",
+                    "../csharp/src/Google.Protobuf/Reflection/Descriptor.cs");
+  generate_test.Run(importer.Import("google/protobuf/any.proto"),
+                    "WellKnownTypes/Any.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Any.cs");
+  generate_test.Run(importer.Import("google/protobuf/api.proto"),
+                    "WellKnownTypes/Api.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Api.cs");
+  generate_test.Run(importer.Import("google/protobuf/duration.proto"),
+                    "WellKnownTypes/Duration.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs");
+  generate_test.Run(importer.Import("google/protobuf/empty.proto"),
+                    "WellKnownTypes/Empty.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs");
+  generate_test.Run(importer.Import("google/protobuf/field_mask.proto"),
+                    "WellKnownTypes/FieldMask.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs");
+  generate_test.Run(importer.Import("google/protobuf/source_context.proto"),
+                    "WellKnownTypes/SourceContext.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs");
+  generate_test.Run(importer.Import("google/protobuf/struct.proto"),
+                    "WellKnownTypes/Struct.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs");
+  generate_test.Run(importer.Import("google/protobuf/timestamp.proto"),
+                    "WellKnownTypes/Timestamp.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs");
+  generate_test.Run(importer.Import("google/protobuf/type.proto"),
+                    "WellKnownTypes/Type.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Type.cs");
+  generate_test.Run(importer.Import("google/protobuf/wrappers.proto"),
+                    "WellKnownTypes/Wrappers.cs",
+                    "../csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs");
+
+  generate_test.SetParameter("");
+  source_tree.MapPath("", TestSourceDir() + "/../conformance");
+  generate_test.Run(importer.Import("conformance.proto"),
+                    "Conformance.cs",
+                    "../csharp/src/Google.Protobuf.Conformance/Conformance.cs");
+
   EXPECT_EQ("", error_collector.text_);
-  ASSERT_TRUE(proto_file != NULL);
-
-  Generator generator;
-  MockGeneratorContext context;
-  string error;
-  string parameter = "base_namespace=Google.Protobuf";
-  ASSERT_TRUE(generator.Generate(proto_file, parameter,
-                                 &context, &error));
-
-  context.ExpectFileMatches(
-      "Reflection/Descriptor.cs",
-      "../csharp/src/Google.Protobuf/Reflection/Descriptor.cs");
 }
 
 }  // namespace
diff --git a/src/google/protobuf/compiler/csharp/csharp_doc_comment.cc b/src/google/protobuf/compiler/csharp/csharp_doc_comment.cc
index 636a76a0..a21dc0a4 100644
--- a/src/google/protobuf/compiler/csharp/csharp_doc_comment.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_doc_comment.cc
@@ -56,7 +56,7 @@ void WriteDocCommentBodyImpl(io::Printer* printer, SourceLocation location) {
     // node of a summary element, not part of an attribute.
     comments = StringReplace(comments, "&", "&amp;", true);
     comments = StringReplace(comments, "<", "&lt;", true);
-    vector<string> lines = Split(comments, "\n", false /* skip_empty */);
+    std::vector<string> lines = Split(comments, "\n", false /* skip_empty */);
     // TODO: We really should work out which part to put in the summary and which to put in the remarks...
     // but that needs to be part of a bigger effort to understand the markdown better anyway.
     printer->Print("/// <summary>\n");
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum.cc b/src/google/protobuf/compiler/csharp/csharp_enum.cc
index 9759e3ef..32c71990 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_enum.cc
@@ -43,8 +43,6 @@
 #include <google/protobuf/compiler/csharp/csharp_helpers.h>
 #include <google/protobuf/compiler/csharp/csharp_options.h>
 
-using google::protobuf::internal::scoped_ptr;
-
 namespace google {
 namespace protobuf {
 namespace compiler {
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum_field.cc b/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
index 67c0b596..9ceffa8c 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
@@ -89,6 +89,10 @@ EnumOneofFieldGenerator::EnumOneofFieldGenerator(
 EnumOneofFieldGenerator::~EnumOneofFieldGenerator() {
 }
 
+void EnumOneofFieldGenerator::GenerateMergingCode(io::Printer* printer) {
+  printer->Print(variables_, "$property_name$ = other.$property_name$;\n");
+}
+
 void EnumOneofFieldGenerator::GenerateParsingCode(io::Printer* printer) {
   // TODO(jonskeet): What about if we read the default value?
   printer->Print(
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum_field.h b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
index 9b7669ba..631632bc 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
@@ -64,6 +64,7 @@ class EnumOneofFieldGenerator : public PrimitiveOneofFieldGenerator {
                           const Options *options);
   ~EnumOneofFieldGenerator();
 
+  virtual void GenerateMergingCode(io::Printer* printer);
   virtual void GenerateParsingCode(io::Printer* printer);
   virtual void GenerateSerializationCode(io::Printer* printer);
   virtual void GenerateSerializedSizeCode(io::Printer* printer);
diff --git a/src/google/protobuf/compiler/csharp/csharp_field_base.cc b/src/google/protobuf/compiler/csharp/csharp_field_base.cc
index 139cc753..7e737e47 100644
--- a/src/google/protobuf/compiler/csharp/csharp_field_base.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_field_base.cc
@@ -46,15 +46,13 @@
 #include <google/protobuf/compiler/csharp/csharp_helpers.h>
 #include <google/protobuf/compiler/csharp/csharp_names.h>
 
-using google::protobuf::internal::scoped_ptr;
-
 namespace google {
 namespace protobuf {
 namespace compiler {
 namespace csharp {
 
 void FieldGeneratorBase::SetCommonFieldVariables(
-    map<string, string>* variables) {
+    std::map<string, string>* variables) {
   // Note: this will be valid even though the tag emitted for packed and unpacked versions of
   // repeated fields varies by wire format. The wire format is encoded in the bottom 3 bits, which
   // never effects the tag size.
@@ -92,7 +90,7 @@ void FieldGeneratorBase::SetCommonFieldVariables(
 }
 
 void FieldGeneratorBase::SetCommonOneofFieldVariables(
-    map<string, string>* variables) {
+    std::map<string, string>* variables) {
   (*variables)["oneof_name"] = oneof_name();
   (*variables)["has_property_check"] =
     oneof_name() + "Case_ == " + oneof_property_name() +
@@ -322,9 +320,9 @@ std::string FieldGeneratorBase::default_value(const FieldDescriptor* descriptor)
       }
     case FieldDescriptor::TYPE_DOUBLE: {
       double value = descriptor->default_value_double();
-      if (value == numeric_limits<double>::infinity()) {
+      if (value == std::numeric_limits<double>::infinity()) {
         return "double.PositiveInfinity";
-      } else if (value == -numeric_limits<double>::infinity()) {
+      } else if (value == -std::numeric_limits<double>::infinity()) {
         return "double.NegativeInfinity";
       } else if (MathLimits<double>::IsNaN(value)) {
         return "double.NaN";
@@ -333,9 +331,9 @@ std::string FieldGeneratorBase::default_value(const FieldDescriptor* descriptor)
     }
     case FieldDescriptor::TYPE_FLOAT: {
       float value = descriptor->default_value_float();
-      if (value == numeric_limits<float>::infinity()) {
+      if (value == std::numeric_limits<float>::infinity()) {
         return "float.PositiveInfinity";
-      } else if (value == -numeric_limits<float>::infinity()) {
+      } else if (value == -std::numeric_limits<float>::infinity()) {
         return "float.NegativeInfinity";
       } else if (MathLimits<float>::IsNaN(value)) {
         return "float.NaN";
diff --git a/src/google/protobuf/compiler/csharp/csharp_field_base.h b/src/google/protobuf/compiler/csharp/csharp_field_base.h
index 4109f3ca..df26853b 100644
--- a/src/google/protobuf/compiler/csharp/csharp_field_base.h
+++ b/src/google/protobuf/compiler/csharp/csharp_field_base.h
@@ -66,14 +66,14 @@ class FieldGeneratorBase : public SourceGeneratorBase {
  protected:
   const FieldDescriptor* descriptor_;
   const int fieldOrdinal_;
-  map<string, string> variables_;
+  std::map<string, string> variables_;
 
   void AddDeprecatedFlag(io::Printer* printer);
   void AddNullCheck(io::Printer* printer);
   void AddNullCheck(io::Printer* printer, const std::string& name);
 
   void AddPublicMemberAttributes(io::Printer* printer);
-  void SetCommonOneofFieldVariables(map<string, string>* variables);
+  void SetCommonOneofFieldVariables(std::map<string, string>* variables);
 
   std::string oneof_property_name();
   std::string oneof_name();
@@ -89,7 +89,7 @@ class FieldGeneratorBase : public SourceGeneratorBase {
   std::string capitalized_type_name();
 
  private:
-  void SetCommonFieldVariables(map<string, string>* variables);
+  void SetCommonFieldVariables(std::map<string, string>* variables);
   std::string GetStringDefaultValueInternal();
   std::string GetBytesDefaultValueInternal();
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_generator.cc b/src/google/protobuf/compiler/csharp/csharp_generator.cc
index c13ed65b..0c93fc29 100644
--- a/src/google/protobuf/compiler/csharp/csharp_generator.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_generator.cc
@@ -44,8 +44,6 @@
 #include <google/protobuf/compiler/csharp/csharp_options.h>
 #include <google/protobuf/compiler/csharp/csharp_reflection_class.h>
 
-using google::protobuf::internal::scoped_ptr;
-
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -64,7 +62,7 @@ bool Generator::Generate(
     GeneratorContext* generator_context,
     string* error) const {
 
-  vector<pair<string, string> > options;
+  std::vector<std::pair<string, string> > options;
   ParseGeneratorParameter(parameter, &options);
 
   // We only support proto3 - but we make an exception for descriptor.proto.
@@ -100,7 +98,7 @@ bool Generator::Generate(
     *error = filename_error;
     return false;
   }
-  scoped_ptr<io::ZeroCopyOutputStream> output(
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(filename));
   io::Printer printer(output.get(), '$');
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.cc b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
index 5bca1ffa..04b61074 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
@@ -169,7 +169,7 @@ std::string UnderscoresToCamelCase(const std::string& input,
     }
   }
   // Add a trailing "_" if the name should be altered.
-  if (input[input.size() - 1] == '#') {
+  if (input.size() > 0 && input[input.size() - 1] == '#') {
     result += '_';
   }
   return result;
diff --git a/src/google/protobuf/compiler/csharp/csharp_map_field.cc b/src/google/protobuf/compiler/csharp/csharp_map_field.cc
index e6eac6ed..d58514ce 100644
--- a/src/google/protobuf/compiler/csharp/csharp_map_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_map_field.cc
@@ -63,9 +63,9 @@ void MapFieldGenerator::GenerateMembers(io::Printer* printer) {
       descriptor_->message_type()->FindFieldByName("value");
   variables_["key_type_name"] = type_name(key_descriptor);
   variables_["value_type_name"] = type_name(value_descriptor);
-  scoped_ptr<FieldGeneratorBase> key_generator(
+  std::unique_ptr<FieldGeneratorBase> key_generator(
       CreateFieldGenerator(key_descriptor, 1, this->options()));
-  scoped_ptr<FieldGeneratorBase> value_generator(
+  std::unique_ptr<FieldGeneratorBase> value_generator(
       CreateFieldGenerator(value_descriptor, 2, this->options()));
 
   printer->Print(
diff --git a/src/google/protobuf/compiler/csharp/csharp_message.cc b/src/google/protobuf/compiler/csharp/csharp_message.cc
index 0f00a438..8a4307f1 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message.cc
@@ -49,8 +49,6 @@
 #include <google/protobuf/compiler/csharp/csharp_message.h>
 #include <google/protobuf/compiler/csharp/csharp_names.h>
 
-using google::protobuf::internal::scoped_ptr;
-
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -105,13 +103,13 @@ void MessageGenerator::AddDeprecatedFlag(io::Printer* printer) {
 }
 
 void MessageGenerator::Generate(io::Printer* printer) {
-  map<string, string> vars;
+  std::map<string, string> vars;
   vars["class_name"] = class_name();
   vars["access_level"] = class_access_level();
 
   WriteMessageDocComment(printer, descriptor_);
   AddDeprecatedFlag(printer);
-  
+
   printer->Print(
     vars,
     "$access_level$ sealed partial class $class_name$ : pb::IMessage<$class_name$> {\n");
@@ -119,14 +117,17 @@ void MessageGenerator::Generate(io::Printer* printer) {
 
   // All static fields and properties
   printer->Print(
-	  vars,
-	  "private static readonly pb::MessageParser<$class_name$> _parser = new pb::MessageParser<$class_name$>(() => new $class_name$());\n");
+      vars,
+      "private static readonly pb::MessageParser<$class_name$> _parser = new pb::MessageParser<$class_name$>(() => new $class_name$());\n");
+
+  printer->Print(
+      "private pb::UnknownFieldSet _unknownFields;\n");
 
   WriteGeneratedCodeAttributes(printer);
 
   printer->Print(
-	  vars,
-	  "public static pb::MessageParser<$class_name$> Parser { get { return _parser; } }\n\n");
+      vars,
+      "public static pb::MessageParser<$class_name$> Parser { get { return _parser; } }\n\n");
 
   // Access the message descriptor via the relevant file descriptor or containing message descriptor.
   if (!descriptor_->containing_type()) {
@@ -139,14 +140,14 @@ void MessageGenerator::Generate(io::Printer* printer) {
 
   WriteGeneratedCodeAttributes(printer);
   printer->Print(
-	vars,
-	"public static pbr::MessageDescriptor Descriptor {\n"
-	"  get { return $descriptor_accessor$; }\n"
-	"}\n"
-	"\n");
+    vars,
+    "public static pbr::MessageDescriptor Descriptor {\n"
+    "  get { return $descriptor_accessor$; }\n"
+    "}\n"
+    "\n");
   WriteGeneratedCodeAttributes(printer);
   printer->Print(
-	vars,
+    vars,
     "pbr::MessageDescriptor pb::IMessage.Descriptor {\n"
     "  get { return Descriptor; }\n"
     "}\n"
@@ -181,7 +182,7 @@ void MessageGenerator::Generate(io::Printer* printer) {
       "field_name", fieldDescriptor->name(),
       "field_constant_name", GetFieldConstantName(fieldDescriptor),
       "index", SimpleItoa(fieldDescriptor->number()));
-    scoped_ptr<FieldGeneratorBase> generator(
+    std::unique_ptr<FieldGeneratorBase> generator(
         CreateFieldGeneratorInternal(fieldDescriptor));
     generator->GenerateMembers(printer);
     printer->Print("\n");
@@ -209,18 +210,18 @@ void MessageGenerator::Generate(io::Printer* printer) {
     printer->Print("}\n");
     // TODO: Should we put the oneof .proto comments here?
     // It's unclear exactly where they should go.
-	printer->Print(
-	  vars,
-	  "private $property_name$OneofCase $name$Case_ = $property_name$OneofCase.None;\n");
-	WriteGeneratedCodeAttributes(printer);
-	printer->Print(
-	  vars,
-	  "public $property_name$OneofCase $property_name$Case {\n"
-	  "  get { return $name$Case_; }\n"
-	  "}\n\n");
-	WriteGeneratedCodeAttributes(printer);
-	printer->Print(
-	  vars,
+    printer->Print(
+      vars,
+      "private $property_name$OneofCase $name$Case_ = $property_name$OneofCase.None;\n");
+    WriteGeneratedCodeAttributes(printer);
+    printer->Print(
+      vars,
+      "public $property_name$OneofCase $property_name$Case {\n"
+      "  get { return $name$Case_; }\n"
+      "}\n\n");
+    WriteGeneratedCodeAttributes(printer);
+    printer->Print(
+      vars,
       "public void Clear$property_name$() {\n"
       "  $name$Case_ = $property_name$OneofCase.None;\n"
       "  $name$_ = null;\n"
@@ -280,7 +281,7 @@ bool MessageGenerator::HasNestedGeneratedTypes()
 }
 
 void MessageGenerator::GenerateCloningCode(io::Printer* printer) {
-  map<string, string> vars;
+  std::map<string, string> vars;
   WriteGeneratedCodeAttributes(printer);
   vars["class_name"] = class_name();
     printer->Print(
@@ -290,7 +291,7 @@ void MessageGenerator::GenerateCloningCode(io::Printer* printer) {
   // Clone non-oneof fields first
   for (int i = 0; i < descriptor_->field_count(); i++) {
     if (!descriptor_->field(i)->containing_oneof()) {
-      scoped_ptr<FieldGeneratorBase> generator(
+      std::unique_ptr<FieldGeneratorBase> generator(
         CreateFieldGeneratorInternal(descriptor_->field(i)));
       generator->GenerateCloningCode(printer);
     }
@@ -304,7 +305,7 @@ void MessageGenerator::GenerateCloningCode(io::Printer* printer) {
     printer->Indent();
     for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
       const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
-      scoped_ptr<FieldGeneratorBase> generator(CreateFieldGeneratorInternal(field));
+      std::unique_ptr<FieldGeneratorBase> generator(CreateFieldGeneratorInternal(field));
       vars["field_property_name"] = GetPropertyName(field);
       printer->Print(
           vars,
@@ -317,6 +318,9 @@ void MessageGenerator::GenerateCloningCode(io::Printer* printer) {
     printer->Outdent();
     printer->Print("}\n\n");
   }
+  // Clone unknown fields
+  printer->Print(
+      "_unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);\n");
 
   printer->Outdent();
   printer->Print("}\n\n");
@@ -333,19 +337,19 @@ void MessageGenerator::GenerateFreezingCode(io::Printer* printer) {
 }
 
 void MessageGenerator::GenerateFrameworkMethods(io::Printer* printer) {
-    map<string, string> vars;
+    std::map<string, string> vars;
     vars["class_name"] = class_name();
 
     // Equality
-	WriteGeneratedCodeAttributes(printer);
+    WriteGeneratedCodeAttributes(printer);
     printer->Print(
         vars,
         "public override bool Equals(object other) {\n"
         "  return Equals(other as $class_name$);\n"
         "}\n\n");
-	WriteGeneratedCodeAttributes(printer);
-	printer->Print(
-	    vars,
+    WriteGeneratedCodeAttributes(printer);
+    printer->Print(
+        vars,
         "public bool Equals($class_name$ other) {\n"
         "  if (ReferenceEquals(other, null)) {\n"
         "    return false;\n"
@@ -355,7 +359,7 @@ void MessageGenerator::GenerateFrameworkMethods(io::Printer* printer) {
         "  }\n");
     printer->Indent();
     for (int i = 0; i < descriptor_->field_count(); i++) {
-        scoped_ptr<FieldGeneratorBase> generator(
+      std::unique_ptr<FieldGeneratorBase> generator(
             CreateFieldGeneratorInternal(descriptor_->field(i)));
         generator->WriteEquals(printer);
     }
@@ -365,18 +369,18 @@ void MessageGenerator::GenerateFrameworkMethods(io::Printer* printer) {
     }
     printer->Outdent();
     printer->Print(
-        "  return true;\n"
+        "  return Equals(_unknownFields, other._unknownFields);\n"
         "}\n\n");
 
     // GetHashCode
     // Start with a non-zero value to easily distinguish between null and "empty" messages.
-	WriteGeneratedCodeAttributes(printer);
-	printer->Print(
+    WriteGeneratedCodeAttributes(printer);
+    printer->Print(
         "public override int GetHashCode() {\n"
         "  int hash = 1;\n");
     printer->Indent();
     for (int i = 0; i < descriptor_->field_count(); i++) {
-        scoped_ptr<FieldGeneratorBase> generator(
+      std::unique_ptr<FieldGeneratorBase> generator(
             CreateFieldGeneratorInternal(descriptor_->field(i)));
         generator->WriteHash(printer);
     }
@@ -384,12 +388,16 @@ void MessageGenerator::GenerateFrameworkMethods(io::Printer* printer) {
         printer->Print("hash ^= (int) $name$Case_;\n",
             "name", UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false));
     }
-    printer->Print("return hash;\n");
+    printer->Print(
+        "if (_unknownFields != null) {\n"
+        "  hash ^= _unknownFields.GetHashCode();\n"
+        "}\n"
+        "return hash;\n");
     printer->Outdent();
     printer->Print("}\n\n");
 
-	WriteGeneratedCodeAttributes(printer);
-	printer->Print(
+    WriteGeneratedCodeAttributes(printer);
+    printer->Print(
         "public override string ToString() {\n"
         "  return pb::JsonFormatter.ToDiagnosticString(this);\n"
         "}\n\n");
@@ -403,26 +411,38 @@ void MessageGenerator::GenerateMessageSerializationMethods(io::Printer* printer)
 
   // Serialize all the fields
   for (int i = 0; i < fields_by_number().size(); i++) {
-    scoped_ptr<FieldGeneratorBase> generator(
+    std::unique_ptr<FieldGeneratorBase> generator(
       CreateFieldGeneratorInternal(fields_by_number()[i]));
     generator->GenerateSerializationCode(printer);
   }
 
+  // Serialize unknown fields
+  printer->Print(
+    "if (_unknownFields != null) {\n"
+    "  _unknownFields.WriteTo(output);\n"
+    "}\n");
+
   // TODO(jonskeet): Memoize size of frozen messages?
   printer->Outdent();
   printer->Print(
-	"}\n"
-	"\n");
+    "}\n"
+    "\n");
   WriteGeneratedCodeAttributes(printer);
   printer->Print(
     "public int CalculateSize() {\n");
   printer->Indent();
   printer->Print("int size = 0;\n");
   for (int i = 0; i < descriptor_->field_count(); i++) {
-    scoped_ptr<FieldGeneratorBase> generator(
+    std::unique_ptr<FieldGeneratorBase> generator(
         CreateFieldGeneratorInternal(descriptor_->field(i)));
     generator->GenerateSerializedSizeCode(printer);
   }
+
+  printer->Print(
+    "if (_unknownFields != null) {\n"
+    "  size += _unknownFields.CalculateSize();\n"
+    "}\n");
+
   printer->Print("return size;\n");
   printer->Outdent();
   printer->Print("}\n\n");
@@ -432,7 +452,7 @@ void MessageGenerator::GenerateMergingMethods(io::Printer* printer) {
   // Note:  These are separate from GenerateMessageSerializationMethods()
   //   because they need to be generated even for messages that are optimized
   //   for code size.
-  map<string, string> vars;
+  std::map<string, string> vars;
   vars["class_name"] = class_name();
 
   WriteGeneratedCodeAttributes(printer);
@@ -447,7 +467,7 @@ void MessageGenerator::GenerateMergingMethods(io::Printer* printer) {
   // Merge non-oneof fields
   for (int i = 0; i < descriptor_->field_count(); i++) {
     if (!descriptor_->field(i)->containing_oneof()) {      
-      scoped_ptr<FieldGeneratorBase> generator(
+      std::unique_ptr<FieldGeneratorBase> generator(
           CreateFieldGeneratorInternal(descriptor_->field(i)));
       generator->GenerateMergingCode(printer);
     }
@@ -463,15 +483,24 @@ void MessageGenerator::GenerateMergingMethods(io::Printer* printer) {
       vars["field_property_name"] = GetPropertyName(field);
       printer->Print(
         vars,
-        "case $property_name$OneofCase.$field_property_name$:\n"
-        "  $field_property_name$ = other.$field_property_name$;\n"
-        "  break;\n");
+        "case $property_name$OneofCase.$field_property_name$:\n");
+      printer->Indent();
+      std::unique_ptr<FieldGeneratorBase> generator(CreateFieldGeneratorInternal(field));
+      generator->GenerateMergingCode(printer);
+      printer->Print("break;\n");
+      printer->Outdent();
     }
     printer->Outdent();
     printer->Print("}\n\n");
   }
+  // Merge unknown fields.
+  printer->Print(
+      "_unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);\n");
+
   printer->Outdent();
   printer->Print("}\n\n");
+
+
   WriteGeneratedCodeAttributes(printer);
   printer->Print("public void MergeFrom(pb::CodedInputStream input) {\n");
   printer->Indent();
@@ -483,14 +512,14 @@ void MessageGenerator::GenerateMergingMethods(io::Printer* printer) {
   printer->Indent();
   // Option messages need to store unknown fields so that options can be parsed later.
   if (IsDescriptorOptionMessage(descriptor_)) {
-	printer->Print(
+    printer->Print(
       "default:\n"
       "  CustomOptions = CustomOptions.ReadOrSkipUnknownField(input);\n"
       "  break;\n");
   } else {
     printer->Print(
       "default:\n"
-      "  input.SkipLastField();\n" // We're not storing the data, but we still need to consume it.
+      "  _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);\n"
       "  break;\n");
   }
   for (int i = 0; i < fields_by_number().size(); i++) {
@@ -515,7 +544,7 @@ void MessageGenerator::GenerateMergingMethods(io::Printer* printer) {
 
     printer->Print("case $tag$: {\n", "tag", SimpleItoa(tag));
     printer->Indent();
-    scoped_ptr<FieldGeneratorBase> generator(
+    std::unique_ptr<FieldGeneratorBase> generator(
         CreateFieldGeneratorInternal(field));
     generator->GenerateParsingCode(printer);
     printer->Print("break;\n");
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.cc b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
index 438f3102..cf1b4dbf 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
@@ -133,7 +133,7 @@ void MessageFieldGenerator::WriteToString(io::Printer* printer) {
 
 void MessageFieldGenerator::GenerateCloningCode(io::Printer* printer) {
   printer->Print(variables_,
-    "$property_name$ = other.$has_property_check$ ? other.$property_name$.Clone() : null;\n");
+    "$name$_ = other.$has_property_check$ ? other.$name$_.Clone() : null;\n");
 }
 
 void MessageFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
@@ -171,6 +171,14 @@ void MessageOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
     "}\n");
 }
 
+void MessageOneofFieldGenerator::GenerateMergingCode(io::Printer* printer) {
+  printer->Print(variables_, 
+    "if ($property_name$ == null) {\n"
+    "  $property_name$ = new $type_name$();\n"
+    "}\n"
+    "$property_name$.MergeFrom(other.$property_name$);\n");
+}
+
 void MessageOneofFieldGenerator::GenerateParsingCode(io::Printer* printer) {
   // TODO(jonskeet): We may be able to do better than this
   printer->Print(
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.h b/src/google/protobuf/compiler/csharp/csharp_message_field.h
index 7d614756..c41ee88a 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.h
@@ -74,6 +74,7 @@ class MessageOneofFieldGenerator : public MessageFieldGenerator {
 
   virtual void GenerateCloningCode(io::Printer* printer);
   virtual void GenerateMembers(io::Printer* printer);
+  virtual void GenerateMergingCode(io::Printer* printer);
   virtual void WriteToString(io::Printer* printer);
   virtual void GenerateParsingCode(io::Printer* printer);
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
index 169122e6..c3003e3d 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
@@ -137,14 +137,22 @@ void PrimitiveFieldGenerator::GenerateSerializedSizeCode(io::Printer* printer) {
 }
 
 void PrimitiveFieldGenerator::WriteHash(io::Printer* printer) {
-  printer->Print(
-    variables_,
-    "if ($has_property_check$) hash ^= $property_name$.GetHashCode();\n");
+  const char *text = "if ($has_property_check$) hash ^= $property_name$.GetHashCode();\n";
+  if (descriptor_->type() == FieldDescriptor::TYPE_FLOAT) {
+    text = "if ($has_property_check$) hash ^= pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.GetHashCode($property_name$);\n";
+  } else if (descriptor_->type() == FieldDescriptor::TYPE_DOUBLE) {
+    text = "if ($has_property_check$) hash ^= pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.GetHashCode($property_name$);\n";
+  }
+	printer->Print(variables_, text);
 }
 void PrimitiveFieldGenerator::WriteEquals(io::Printer* printer) {
-  printer->Print(
-    variables_,
-    "if ($property_name$ != other.$property_name$) return false;\n");
+  const char *text = "if ($property_name$ != other.$property_name$) return false;\n";
+  if (descriptor_->type() == FieldDescriptor::TYPE_FLOAT) {
+    text = "if (!pbc::ProtobufEqualityComparers.BitwiseSingleEqualityComparer.Equals($property_name$, other.$property_name$)) return false;\n";
+  } else if (descriptor_->type() == FieldDescriptor::TYPE_DOUBLE) {
+    text = "if (!pbc::ProtobufEqualityComparers.BitwiseDoubleEqualityComparer.Equals($property_name$, other.$property_name$)) return false;\n";
+  }
+  printer->Print(variables_, text);
 }
 void PrimitiveFieldGenerator::WriteToString(io::Printer* printer) {
   printer->Print(
@@ -196,6 +204,10 @@ void PrimitiveOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
       "}\n");
 }
 
+void PrimitiveOneofFieldGenerator::GenerateMergingCode(io::Printer* printer) {
+  printer->Print(variables_, "$property_name$ = other.$property_name$;\n");
+}
+
 void PrimitiveOneofFieldGenerator::WriteToString(io::Printer* printer) {
   printer->Print(variables_,
     "PrintField(\"$descriptor_name$\", $has_property_check$, $oneof_name$_, writer);\n");
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
index 5f466fc4..ca7b8b3d 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
@@ -78,6 +78,7 @@ class PrimitiveOneofFieldGenerator : public PrimitiveFieldGenerator {
 
   virtual void GenerateCloningCode(io::Printer* printer);
   virtual void GenerateMembers(io::Printer* printer);
+  virtual void GenerateMergingCode(io::Printer* printer);
   virtual void WriteToString(io::Printer* printer);
   virtual void GenerateParsingCode(io::Printer* printer);
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_reflection_class.cc b/src/google/protobuf/compiler/csharp/csharp_reflection_class.cc
index bac9aef7..5ddd616e 100644
--- a/src/google/protobuf/compiler/csharp/csharp_reflection_class.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_reflection_class.cc
@@ -104,8 +104,10 @@ void ReflectionClassGenerator::Generate(io::Printer* printer) {
 
 void ReflectionClassGenerator::WriteIntroduction(io::Printer* printer) {
   printer->Print(
-    "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
-    "// source: $file_name$\n"
+    "// <auto-generated>\n"
+    "//     Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
+    "//     source: $file_name$\n"
+    "// </auto-generated>\n"
     "#pragma warning disable 1591, 0612, 3021\n"
     "#region Designer generated code\n"
     "\n"
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
index 8fa0b050..90af569c 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
@@ -66,11 +66,11 @@ void RepeatedMessageFieldGenerator::GenerateMembers(io::Printer* printer) {
   // "create single field generator for this repeated field"
   // function, but it doesn't seem worth it for just this.
   if (IsWrapperType(descriptor_)) {
-    scoped_ptr<FieldGeneratorBase> single_generator(
+    std::unique_ptr<FieldGeneratorBase> single_generator(
       new WrapperFieldGenerator(descriptor_, fieldOrdinal_, this->options()));
     single_generator->GenerateCodecCode(printer);
   } else {
-    scoped_ptr<FieldGeneratorBase> single_generator(
+    std::unique_ptr<FieldGeneratorBase> single_generator(
       new MessageFieldGenerator(descriptor_, fieldOrdinal_, this->options()));
     single_generator->GenerateCodecCode(printer);
   }
diff --git a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
index 797d498e..047edf73 100644
--- a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
@@ -120,15 +120,25 @@ void WrapperFieldGenerator::GenerateSerializedSizeCode(io::Printer* printer) {
 }
 
 void WrapperFieldGenerator::WriteHash(io::Printer* printer) {
-  printer->Print(
-    variables_,
-    "if ($has_property_check$) hash ^= $property_name$.GetHashCode();\n");
+  const char *text = "if ($has_property_check$) hash ^= $property_name$.GetHashCode();\n";
+  if (descriptor_->message_type()->field(0)->type() == FieldDescriptor::TYPE_FLOAT) {
+    text = "if ($has_property_check$) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.GetHashCode($property_name$);\n";
+  }
+  else if (descriptor_->message_type()->field(0)->type() == FieldDescriptor::TYPE_DOUBLE) {
+    text = "if ($has_property_check$) hash ^= pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.GetHashCode($property_name$);\n";
+  }
+  printer->Print(variables_, text);
 }
 
 void WrapperFieldGenerator::WriteEquals(io::Printer* printer) {
-  printer->Print(
-    variables_,
-    "if ($property_name$ != other.$property_name$) return false;\n");
+  const char *text = "if ($property_name$ != other.$property_name$) return false;\n";
+  if (descriptor_->message_type()->field(0)->type() == FieldDescriptor::TYPE_FLOAT) {
+    text = "if (!pbc::ProtobufEqualityComparers.BitwiseNullableSingleEqualityComparer.Equals($property_name$, other.$property_name$)) return false;\n";
+  }
+  else if (descriptor_->message_type()->field(0)->type() == FieldDescriptor::TYPE_DOUBLE) {
+    text = "if (!pbc::ProtobufEqualityComparers.BitwiseNullableDoubleEqualityComparer.Equals($property_name$, other.$property_name$)) return false;\n";
+  }
+  printer->Print(variables_, text);
 }
 
 void WrapperFieldGenerator::WriteToString(io::Printer* printer) {
@@ -181,6 +191,10 @@ void WrapperOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
     "}\n");
 }
 
+void WrapperOneofFieldGenerator::GenerateMergingCode(io::Printer* printer) {
+  printer->Print(variables_, "$property_name$ = other.$property_name$;\n");
+}
+
 void WrapperOneofFieldGenerator::GenerateParsingCode(io::Printer* printer) {
   printer->Print(
     variables_,
diff --git a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
index 250dfd25..452531fb 100644
--- a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
@@ -75,6 +75,7 @@ class WrapperOneofFieldGenerator : public WrapperFieldGenerator {
   ~WrapperOneofFieldGenerator();
 
   virtual void GenerateMembers(io::Printer* printer);
+  virtual void GenerateMergingCode(io::Printer* printer);
   virtual void GenerateParsingCode(io::Printer* printer);
   virtual void GenerateSerializationCode(io::Printer* printer);
   virtual void GenerateSerializedSizeCode(io::Printer* printer);
diff --git a/src/google/protobuf/compiler/importer.cc b/src/google/protobuf/compiler/importer.cc
index 462748b9..c3831e72 100644
--- a/src/google/protobuf/compiler/importer.cc
+++ b/src/google/protobuf/compiler/importer.cc
@@ -33,7 +33,7 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #ifdef _MSC_VER
-#include <io.h>
+#include <direct.h>
 #else
 #include <unistd.h>
 #endif
@@ -44,9 +44,6 @@
 
 #include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/importer.h>
 
@@ -55,15 +52,22 @@
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/stubs/strutil.h>
 
+
+#include <google/protobuf/stubs/io_win32.h>
+
+#ifdef _WIN32
+#include <ctype.h>
+#endif
+
 namespace google {
 namespace protobuf {
 namespace compiler {
 
 #ifdef _WIN32
-#ifndef F_OK
-#define F_OK 00  // not defined by MSVC for whatever reason
-#endif
-#include <ctype.h>
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::open;
 #endif
 
 // Returns true if the text looks like a Windows-style absolute path, starting
@@ -125,7 +129,7 @@ SourceTreeDescriptorDatabase::~SourceTreeDescriptorDatabase() {}
 
 bool SourceTreeDescriptorDatabase::FindFileByName(
     const string& filename, FileDescriptorProto* output) {
-  google::protobuf::scoped_ptr<io::ZeroCopyInputStream> input(source_tree_->Open(filename));
+  std::unique_ptr<io::ZeroCopyInputStream> input(source_tree_->Open(filename));
   if (input == NULL) {
     if (error_collector_ != NULL) {
       error_collector_->AddError(filename, -1, 0,
@@ -222,6 +226,7 @@ void Importer::ClearUnusedImportTrackFiles() {
   pool_.ClearUnusedImportTrackFiles();
 }
 
+
 // ===================================================================
 
 SourceTree::~SourceTree() {}
@@ -294,10 +299,8 @@ static string CanonicalizePath(string path) {
 }
 
 static inline bool ContainsParentReference(const string& path) {
-  return path == ".." ||
-         HasPrefixString(path, "../") ||
-         HasSuffixString(path, "/..") ||
-         path.find("/../") != string::npos;
+  return path == ".." || HasPrefixString(path, "../") ||
+         HasSuffixString(path, "/..") || path.find("/../") != string::npos;
 }
 
 // Maps a file from an old location to a new one.  Typically, old_prefix is
@@ -327,8 +330,7 @@ static bool ApplyMapping(const string& filename,
       // We do not allow the file name to use "..".
       return false;
     }
-    if (HasPrefixString(filename, "/") ||
-        IsWindowsAbsolutePath(filename)) {
+    if (HasPrefixString(filename, "/") || IsWindowsAbsolutePath(filename)) {
       // This is an absolute path, so it isn't matched by the empty string.
       return false;
     }
@@ -416,7 +418,7 @@ DiskSourceTree::DiskFileToVirtualFile(
   // Verify that we can open the file.  Note that this also has the side-effect
   // of verifying that we are not canonicalizing away any non-existent
   // directories.
-  google::protobuf::scoped_ptr<io::ZeroCopyInputStream> stream(OpenDiskFile(disk_file));
+  std::unique_ptr<io::ZeroCopyInputStream> stream(OpenDiskFile(disk_file));
   if (stream == NULL) {
     return CANNOT_OPEN;
   }
@@ -426,7 +428,7 @@ DiskSourceTree::DiskFileToVirtualFile(
 
 bool DiskSourceTree::VirtualFileToDiskFile(const string& virtual_file,
                                            string* disk_file) {
-  google::protobuf::scoped_ptr<io::ZeroCopyInputStream> stream(
+  std::unique_ptr<io::ZeroCopyInputStream> stream(
       OpenVirtualFile(virtual_file, disk_file));
   return stream != NULL;
 }
diff --git a/src/google/protobuf/compiler/importer.h b/src/google/protobuf/compiler/importer.h
index 759636e1..a4ffcf87 100644
--- a/src/google/protobuf/compiler/importer.h
+++ b/src/google/protobuf/compiler/importer.h
@@ -175,6 +175,7 @@ class LIBPROTOBUF_EXPORT Importer {
   void AddUnusedImportTrackFile(const string& file_name);
   void ClearUnusedImportTrackFiles();
 
+
  private:
   SourceTreeDescriptorDatabase database_;
   DescriptorPool pool_;
diff --git a/src/google/protobuf/compiler/importer_unittest.cc b/src/google/protobuf/compiler/importer_unittest.cc
index 00285bcc..73bef3f4 100644
--- a/src/google/protobuf/compiler/importer_unittest.cc
+++ b/src/google/protobuf/compiler/importer_unittest.cc
@@ -36,9 +36,6 @@
 
 #include <google/protobuf/stubs/hash.h>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -47,11 +44,11 @@
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 #include <google/protobuf/stubs/map_util.h>
+#include <google/protobuf/stubs/strutil.h>
 
 namespace google {
 namespace protobuf {
@@ -268,7 +265,7 @@ class DiskSourceTreeTest : public testing::Test {
 
   void ExpectFileContents(const string& filename,
                           const char* expected_contents) {
-    google::protobuf::scoped_ptr<io::ZeroCopyInputStream> input(source_tree_.Open(filename));
+    std::unique_ptr<io::ZeroCopyInputStream> input(source_tree_.Open(filename));
 
     ASSERT_FALSE(input == NULL);
 
@@ -285,7 +282,7 @@ class DiskSourceTreeTest : public testing::Test {
 
   void ExpectCannotOpenFile(const string& filename,
                             const string& error_message) {
-    google::protobuf::scoped_ptr<io::ZeroCopyInputStream> input(source_tree_.Open(filename));
+    std::unique_ptr<io::ZeroCopyInputStream> input(source_tree_.Open(filename));
     EXPECT_TRUE(input == NULL);
     EXPECT_EQ(error_message, source_tree_.GetLastErrorMessage());
   }
diff --git a/src/google/protobuf/compiler/java/java_context.cc b/src/google/protobuf/compiler/java/java_context.cc
index b82fb3dd..2528c2d1 100644
--- a/src/google/protobuf/compiler/java/java_context.cc
+++ b/src/google/protobuf/compiler/java/java_context.cc
@@ -50,7 +50,7 @@ Context::Context(const FileDescriptor* file, const Options& options)
 Context::~Context() {
 }
 
-ClassNameResolver* Context::GetNameResolver() {
+ClassNameResolver* Context::GetNameResolver() const {
   return name_resolver_.get();
 }
 
@@ -69,14 +69,14 @@ bool IsConflicting(const FieldDescriptor* field1, const string& name1,
       // field1 is repeated, and field2 is not.
       if (name1 + "Count" == name2) {
         *info = "both repeated field \"" + field1->name() + "\" and singular " +
-            "field \"" + field2->name() + "\" generates the method \"" +
-            "get" + name1 + "Count()\"";
+                "field \"" + field2->name() + "\" generate the method \"" +
+                "get" + name1 + "Count()\"";
         return true;
       }
       if (name1 + "List" == name2) {
         *info = "both repeated field \"" + field1->name() + "\" and singular " +
-            "field \"" + field2->name() + "\" generates the method \"" +
-            "get" + name1 + "List()\"";
+                "field \"" + field2->name() + "\" generate the method \"" +
+                "get" + name1 + "List()\"";
         return true;
       }
       // Well, there are obviously many more conflicting cases, but it probably
@@ -154,7 +154,7 @@ void Context::InitializeFieldGeneratorInfoForFields(
   for (int i = 0; i < fields.size(); ++i) {
     const FieldDescriptor* field = fields[i];
     FieldGeneratorInfo info;
-    info.name = UnderscoresToCamelCase(field);
+    info.name = CamelCaseFieldName(field);
     info.capitalized_name = UnderscoresToCapitalizedCamelCase(field);
     // For fields conflicting with some other fields, we append the field
     // number to their field names in generated code to avoid conflicts.
diff --git a/src/google/protobuf/compiler/java/java_context.h b/src/google/protobuf/compiler/java/java_context.h
index b22e7e3a..9de7415a 100644
--- a/src/google/protobuf/compiler/java/java_context.h
+++ b/src/google/protobuf/compiler/java/java_context.h
@@ -33,9 +33,6 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/stubs/common.h>
@@ -70,7 +67,7 @@ class Context {
 
   // Get the name resolver associated with this context. The resolver
   // can be used to map descriptors to Java class names.
-  ClassNameResolver* GetNameResolver();
+  ClassNameResolver* GetNameResolver() const;
 
   // Get the FieldGeneratorInfo for a given field.
   const FieldGeneratorInfo* GetFieldGeneratorInfo(
@@ -97,7 +94,7 @@ class Context {
   void InitializeFieldGeneratorInfoForFields(
       const std::vector<const FieldDescriptor*>& fields);
 
-  google::protobuf::scoped_ptr<ClassNameResolver> name_resolver_;
+  std::unique_ptr<ClassNameResolver> name_resolver_;
   std::map<const FieldDescriptor*, FieldGeneratorInfo>
       field_generator_info_map_;
   std::map<const OneofDescriptor*, OneofGeneratorInfo>
diff --git a/src/google/protobuf/compiler/java/java_enum.cc b/src/google/protobuf/compiler/java/java_enum.cc
index b9ee00ff..bef69f1a 100644
--- a/src/google/protobuf/compiler/java/java_enum.cc
+++ b/src/google/protobuf/compiler/java/java_enum.cc
@@ -36,12 +36,12 @@
 #include <string>
 
 #include <google/protobuf/compiler/java/java_context.h>
-#include <google/protobuf/compiler/java/java_enum.h>
 #include <google/protobuf/compiler/java/java_doc_comment.h>
+#include <google/protobuf/compiler/java/java_enum.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -109,14 +109,16 @@ void EnumGenerator::Generate(io::Printer* printer) {
       printer->Print(vars,
         "$name$($index$, $number$),\n");
     }
+    printer->Annotate("name", canonical_values_[i]);
   }
 
   if (SupportUnknownEnumValue(descriptor_->file())) {
     if (ordinal_is_index) {
-      printer->Print("UNRECOGNIZED(-1),\n");
+      printer->Print("${$UNRECOGNIZED$}$(-1),\n", "{", "", "}", "");
     } else {
-      printer->Print("UNRECOGNIZED(-1, -1),\n");
+      printer->Print("${$UNRECOGNIZED$}$(-1, -1),\n", "{", "", "}", "");
     }
+    printer->Annotate("{", "}", descriptor_);
   }
 
   printer->Print(
@@ -133,15 +135,19 @@ void EnumGenerator::Generate(io::Printer* printer) {
     WriteEnumValueDocComment(printer, aliases_[i].value);
     printer->Print(vars,
       "public static final $classname$ $name$ = $canonical_name$;\n");
+    printer->Annotate("name", aliases_[i].value);
   }
 
   for (int i = 0; i < descriptor_->value_count(); i++) {
     std::map<string, string> vars;
     vars["name"] = descriptor_->value(i)->name();
     vars["number"] = SimpleItoa(descriptor_->value(i)->number());
+    vars["{"] = "";
+    vars["}"] = "";
     WriteEnumValueDocComment(printer, descriptor_->value(i));
     printer->Print(vars,
-      "public static final int $name$_VALUE = $number$;\n");
+      "public static final int ${$$name$_VALUE$}$ = $number$;\n");
+    printer->Annotate("{", "}", descriptor_->value(i));
   }
   printer->Print("\n");
 
diff --git a/src/google/protobuf/compiler/java/java_enum_field.cc b/src/google/protobuf/compiler/java/java_enum_field.cc
index 279b9da4..0686ea0f 100644
--- a/src/google/protobuf/compiler/java/java_enum_field.cc
+++ b/src/google/protobuf/compiler/java/java_enum_field.cc
@@ -80,7 +80,7 @@ void SetEnumVariables(const FieldDescriptor* descriptor,
   // Use deprecated valueOf() method to be compatible with old generated code
   // for v2.5.0/v2.6.1.
   // TODO(xiaofeng): Use "forNumber" when we no longer support compatibility
-  // with v2.5.0/v2.6.1.
+  // with v2.5.0/v2.6.1, and remove the @SuppressWarnings annotations.
   (*variables)["for_number"] = "valueOf";
 
   if (SupportFieldPresence(descriptor->file())) {
@@ -183,23 +183,27 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  return $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
+    "  @SuppressWarnings(\"deprecation\")\n"
     "  $type$ result = $type$.$for_number$($name$_);\n"
     "  return result == null ? $unknown$ : result;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumFieldGenerator::
@@ -209,33 +213,39 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_builder$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  return $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$set$capitalized_name$Value$}$(int value) {\n"
       "  $name$_ = value;\n"
       "  $on_changed$\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
+    "  @SuppressWarnings(\"deprecation\")\n"
     "  $type$ result = $type$.$for_number$($name$_);\n"
     "  return result == null ? $unknown$ : result;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  if (value == null) {\n"
     "    throw new NullPointerException();\n"
     "  }\n"
@@ -244,14 +254,16 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+    printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $clear_has_field_bit_builder$\n"
     "  $name$_ = $default_number$;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumFieldGenerator::
@@ -310,13 +322,10 @@ GenerateParsingCode(io::Printer* printer) const {
   } else {
     printer->Print(variables_,
       "int rawValue = input.readEnum();\n"
+    "  @SuppressWarnings(\"deprecation\")\n"
       "$type$ value = $type$.$for_number$(rawValue);\n"
-      "if (value == null) {\n");
-    if (PreserveUnknownFields(descriptor_->containing_type())) {
-      printer->Print(variables_,
-        "  unknownFields.mergeVarintField($number$, rawValue);\n");
-    }
-    printer->Print(variables_,
+      "if (value == null) {\n"
+      "  unknownFields.mergeVarintField($number$, rawValue);\n"
       "} else {\n"
       "  $set_has_field_bit_message$\n"
       "  $name$_ = rawValue;\n"
@@ -386,30 +395,34 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  if ($has_oneof_case_message$) {\n"
       "    return (java.lang.Integer) $oneof_name$_;\n"
       "  }\n"
       "  return $default_number$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
+    "    @SuppressWarnings(\"deprecation\")\n"
     "    $type$ result = $type$.$for_number$(\n"
     "        (java.lang.Integer) $oneof_name$_);\n"
     "    return result == null ? $unknown$ : result;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumOneofFieldGenerator::
@@ -417,41 +430,47 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  if ($has_oneof_case_message$) {\n"
       "    return ((java.lang.Integer) $oneof_name$_).intValue();\n"
       "  }\n"
       "  return $default_number$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$set$capitalized_name$Value$}$(int value) {\n"
       "  $set_oneof_case_message$;\n"
       "  $oneof_name$_ = value;\n"
       "  $on_changed$\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
+    "    @SuppressWarnings(\"deprecation\")\n"
     "    $type$ result = $type$.$for_number$(\n"
     "        (java.lang.Integer) $oneof_name$_);\n"
     "    return result == null ? $unknown$ : result;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  if (value == null) {\n"
     "    throw new NullPointerException();\n"
     "  }\n"
@@ -460,9 +479,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    $clear_oneof_case_message$;\n"
     "    $oneof_name$_ = null;\n"
@@ -470,6 +490,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  }\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumOneofFieldGenerator::
@@ -501,13 +522,10 @@ GenerateParsingCode(io::Printer* printer) const {
   } else {
     printer->Print(variables_,
       "int rawValue = input.readEnum();\n"
+      "@SuppressWarnings(\"deprecation\")\n"
       "$type$ value = $type$.$for_number$(rawValue);\n"
-      "if (value == null) {\n");
-    if (PreserveUnknownFields(descriptor_->containing_type())) {
-      printer->Print(variables_,
-        "  unknownFields.mergeVarintField($number$, rawValue);\n");
-    }
-    printer->Print(variables_,
+      "if (value == null) {\n"
+      "  unknownFields.mergeVarintField($number$, rawValue);\n"
       "} else {\n"
       "  $set_oneof_case_message$;\n"
       "  $oneof_name$_ = rawValue;\n"
@@ -614,6 +632,7 @@ GenerateMembers(io::Printer* printer) const {
     "        new com.google.protobuf.Internal.ListAdapter.Converter<\n"
     "            java.lang.Integer, $type$>() {\n"
     "          public $type$ convert(java.lang.Integer from) {\n"
+    "            @SuppressWarnings(\"deprecation\")\n"
     "            $type$ result = $type$.$for_number$(from);\n"
     "            return result == null ? $unknown$ : result;\n"
     "          }\n"
@@ -621,36 +640,41 @@ GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return new com.google.protobuf.Internal.ListAdapter<\n"
     "      java.lang.Integer, $type$>($name$_, $name$_converter_);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_converter_.convert($name$_.get(index));\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
       "$deprecation$public java.util.List<java.lang.Integer>\n"
-      "get$capitalized_name$ValueList() {\n"
+      "${$get$capitalized_name$ValueList$}$() {\n"
       "  return $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value(int index) {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$(int index) {\n"
       "  return $name$_.get(index);\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
-  if (descriptor_->is_packed() &&
-      context_->HasGeneratedMethods(descriptor_->containing_type())) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "private int $name$MemoizedSerializedSize;\n");
   }
@@ -684,23 +708,27 @@ GenerateBuilderMembers(io::Printer* printer) const {
     //   could hold on to the returned list and modify it after the message
     //   has been built, thus mutating the message which is supposed to be
     //   immutable.
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return new com.google.protobuf.Internal.ListAdapter<\n"
     "      java.lang.Integer, $type$>($name$_, $name$_converter_);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_converter_.convert($name$_.get(index));\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "  if (value == null) {\n"
     "    throw new NullPointerException();\n"
@@ -710,9 +738,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value) {\n"
     "  if (value == null) {\n"
     "    throw new NullPointerException();\n"
     "  }\n"
@@ -721,9 +750,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $type$> values) {\n"
     "  ensure$capitalized_name$IsMutable();\n"
     "  for ($type$ value : values) {\n"
@@ -732,47 +762,54 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $name$_ = java.util.Collections.emptyList();\n"
     "  $clear_mutable_bit_builder$;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
       "$deprecation$public java.util.List<java.lang.Integer>\n"
-      "get$capitalized_name$ValueList() {\n"
+      "${$get$capitalized_name$ValueList$}$() {\n"
       "  return java.util.Collections.unmodifiableList($name$_);\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value(int index) {\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$(int index) {\n"
       "  return $name$_.get(index);\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(\n"
+      "$deprecation$public Builder ${$set$capitalized_name$Value$}$(\n"
       "    int index, int value) {\n"
       "  ensure$capitalized_name$IsMutable();\n"
       "  $name$_.set(index, value);\n"
       "  $on_changed$\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder add$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$add$capitalized_name$Value$}$(int value) {\n"
       "  ensure$capitalized_name$IsMutable();\n"
       "  $name$_.add(value);\n"
       "  $on_changed$\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder addAll$capitalized_name$Value(\n"
+      "$deprecation$public Builder ${$addAll$capitalized_name$Value$}$(\n"
       "    java.lang.Iterable<java.lang.Integer> values) {\n"
       "  ensure$capitalized_name$IsMutable();\n"
       "  for (int value : values) {\n"
@@ -781,6 +818,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
       "  $on_changed$\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -847,13 +885,10 @@ GenerateParsingCode(io::Printer* printer) const {
   } else {
     printer->Print(variables_,
       "int rawValue = input.readEnum();\n"
+      "@SuppressWarnings(\"deprecation\")\n"
       "$type$ value = $type$.$for_number$(rawValue);\n"
-        "if (value == null) {\n");
-    if (PreserveUnknownFields(descriptor_->containing_type())) {
-      printer->Print(variables_,
-        "  unknownFields.mergeVarintField($number$, rawValue);\n");
-    }
-    printer->Print(variables_,
+      "if (value == null) {\n"
+      "  unknownFields.mergeVarintField($number$, rawValue);\n"
       "} else {\n"
       "  if (!$get_mutable_bit_parser$) {\n"
       "    $name$_ = new java.util.ArrayList<java.lang.Integer>();\n"
diff --git a/src/google/protobuf/compiler/java/java_enum_field_lite.cc b/src/google/protobuf/compiler/java/java_enum_field_lite.cc
index 50eed5da..f1fe71b0 100644
--- a/src/google/protobuf/compiler/java/java_enum_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_enum_field_lite.cc
@@ -165,23 +165,29 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  return $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  $type$ result = $type$.forNumber($name$_);\n"
     "  return result == null ? $unknown$ : result;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Generate private setters for the builder to proxy into.
   if (SupportUnknownEnumValue(descriptor_->file())) {
@@ -214,43 +220,53 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  return instance.get$capitalized_name$Value();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$set$capitalized_name$Value$}$(int value) {\n"
       "  copyOnWrite();\n"
       "  instance.set$capitalized_name$Value(value);\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumFieldLiteGenerator::
@@ -296,12 +312,8 @@ GenerateParsingCode(io::Printer* printer) const {
     printer->Print(variables_,
       "int rawValue = input.readEnum();\n"
       "$type$ value = $type$.forNumber(rawValue);\n"
-      "if (value == null) {\n");
-    if (PreserveUnknownFields(descriptor_->containing_type())) {
-      printer->Print(variables_,
-        "  super.mergeVarintField($number$, rawValue);\n");
-    }
-    printer->Print(variables_,
+      "if (value == null) {\n"
+      "  super.mergeVarintField($number$, rawValue);\n"
       "} else {\n"
       "  $set_has_field_bit_message$\n"
       "  $name$_ = rawValue;\n"
@@ -314,6 +326,7 @@ GenerateParsingDoneCode(io::Printer* printer) const {
   // noop for enums
 }
 
+
 void ImmutableEnumFieldLiteGenerator::
 GenerateSerializationCode(io::Printer* printer) const {
   printer->Print(variables_,
@@ -371,29 +384,35 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  if ($has_oneof_case_message$) {\n"
       "    return (java.lang.Integer) $oneof_name$_;\n"
       "  }\n"
       "  return $default_number$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    $type$ result = $type$.forNumber((java.lang.Integer) $oneof_name$_);\n"
     "    return result == null ? $unknown$ : result;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Generate private setters for the builder to proxy into.
   if (SupportUnknownEnumValue(descriptor_->file())) {
@@ -423,48 +442,59 @@ GenerateMembers(io::Printer* printer) const {
     "}\n");
 }
 
+
 void ImmutableEnumOneofFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$() {\n"
       "  return instance.get$capitalized_name$Value();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$set$capitalized_name$Value$}$(int value) {\n"
       "  copyOnWrite();\n"
       "  instance.set$capitalized_name$Value(value);\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableEnumOneofFieldLiteGenerator::
@@ -485,12 +515,8 @@ GenerateParsingCode(io::Printer* printer) const {
     printer->Print(variables_,
       "int rawValue = input.readEnum();\n"
       "$type$ value = $type$.forNumber(rawValue);\n"
-      "if (value == null) {\n");
-    if (PreserveUnknownFields(descriptor_->containing_type())) {
-      printer->Print(variables_,
-        "  super.mergeVarintField($number$, rawValue);\n");
-    }
-    printer->Print(variables_,
+      "if (value == null) {\n"
+      "  super.mergeVarintField($number$, rawValue);\n"
       "} else {\n"
       "  $set_oneof_case_message$;\n"
       "  $oneof_name$_ = rawValue;\n"
@@ -597,6 +623,7 @@ GenerateMembers(io::Printer* printer) const {
     "    java.lang.Integer, $type$> $name$_converter_ =\n"
     "        new com.google.protobuf.Internal.ListAdapter.Converter<\n"
     "            java.lang.Integer, $type$>() {\n"
+    "          @java.lang.Override\n"
     "          public $type$ convert(java.lang.Integer from) {\n"
     "            $type$ result = $type$.forNumber(from);\n"
     "            return result == null ? $unknown$ : result;\n"
@@ -605,35 +632,46 @@ GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return new com.google.protobuf.Internal.ListAdapter<\n"
     "      java.lang.Integer, $type$>($name$_, $name$_converter_);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_converter_.convert($name$_.getInt(index));\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
+      "@java.lang.Override\n"
       "$deprecation$public java.util.List<java.lang.Integer>\n"
-      "get$capitalized_name$ValueList() {\n"
+      "${$get$capitalized_name$ValueList$}$() {\n"
       "  return $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value(int index) {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$(int index) {\n"
       "  return $name$_.getInt(index);\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
-  if (descriptor_->options().packed() &&
+  if (descriptor_->is_packed() &&
       context_->HasGeneratedMethods(descriptor_->containing_type())) {
     printer->Print(variables_,
       "private int $name$MemoizedSerializedSize;\n");
@@ -707,89 +745,109 @@ GenerateMembers(io::Printer* printer) const {
   }
 }
 
+
 void RepeatedImmutableEnumFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return instance.get$capitalized_name$List();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return instance.get$capitalized_name$Count();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return instance.get$capitalized_name$(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(index, value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $type$> values) {\n"
     "  copyOnWrite();\n"
     "  instance.addAll$capitalized_name$(values);"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   if (SupportUnknownEnumValue(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
+      "@java.lang.Override\n"
       "$deprecation$public java.util.List<java.lang.Integer>\n"
-      "get$capitalized_name$ValueList() {\n"
+      "${$get$capitalized_name$ValueList$}$() {\n"
       "  return java.util.Collections.unmodifiableList(\n"
       "      instance.get$capitalized_name$ValueList());\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public int get$capitalized_name$Value(int index) {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public int ${$get$capitalized_name$Value$}$(int index) {\n"
       "  return instance.get$capitalized_name$Value(index);\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder set$capitalized_name$Value(\n"
+      "$deprecation$public Builder ${$set$capitalized_name$Value$}$(\n"
       "    int index, int value) {\n"
       "  copyOnWrite();\n"
       "  instance.set$capitalized_name$Value(index, value);\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder add$capitalized_name$Value(int value) {\n"
+      "$deprecation$public Builder "
+      "${$add$capitalized_name$Value$}$(int value) {\n"
       "  instance.add$capitalized_name$Value(value);\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public Builder addAll$capitalized_name$Value(\n"
+      "$deprecation$public Builder ${$addAll$capitalized_name$Value$}$(\n"
       "    java.lang.Iterable<java.lang.Integer> values) {\n"
       "  copyOnWrite();\n"
       "  instance.addAll$capitalized_name$Value(values);\n"
       "  return this;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -886,7 +944,7 @@ GenerateParsingDoneCode(io::Printer* printer) const {
 
 void RepeatedImmutableEnumFieldLiteGenerator::
 GenerateSerializationCode(io::Printer* printer) const {
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "if (get$capitalized_name$List().size() > 0) {\n"
       "  output.writeUInt32NoTag($tag$);\n"
@@ -917,7 +975,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
     "}\n");
   printer->Print(
     "size += dataSize;\n");
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "if (!get$capitalized_name$List().isEmpty()) {"
       "  size += $tag_size$;\n"
@@ -930,7 +988,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
   }
 
   // cache the data size for packed fields.
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "$name$MemoizedSerializedSize = dataSize;\n");
   }
diff --git a/src/google/protobuf/compiler/java/java_enum_lite.cc b/src/google/protobuf/compiler/java/java_enum_lite.cc
index 96815920..806008ee 100644
--- a/src/google/protobuf/compiler/java/java_enum_lite.cc
+++ b/src/google/protobuf/compiler/java/java_enum_lite.cc
@@ -36,12 +36,12 @@
 #include <string>
 
 #include <google/protobuf/compiler/java/java_context.h>
-#include <google/protobuf/compiler/java/java_enum_lite.h>
 #include <google/protobuf/compiler/java/java_doc_comment.h>
+#include <google/protobuf/compiler/java/java_enum_lite.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -49,17 +49,6 @@ namespace protobuf {
 namespace compiler {
 namespace java {
 
-namespace {
-bool EnumHasCustomOptions(const EnumDescriptor* descriptor) {
-  if (descriptor->options().unknown_fields().field_count() > 0) return true;
-  for (int i = 0; i < descriptor->value_count(); ++i) {
-    const EnumValueDescriptor* value = descriptor->value(i);
-    if (value->options().unknown_fields().field_count() > 0) return true;
-  }
-  return false;
-}
-}  // namespace
-
 EnumLiteGenerator::EnumLiteGenerator(const EnumDescriptor* descriptor,
                                      bool immutable_api, Context* context)
     : descriptor_(descriptor),
@@ -104,10 +93,12 @@ void EnumLiteGenerator::Generate(io::Printer* printer) {
     }
     printer->Print(vars,
       "$name$($number$),\n");
+    printer->Annotate("name", canonical_values_[i]);
   }
 
   if (SupportUnknownEnumValue(descriptor_->file())) {
-    printer->Print("UNRECOGNIZED(-1),\n");
+    printer->Print("${$UNRECOGNIZED$}$(-1),\n", "{", "", "}", "");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   printer->Print(
@@ -124,37 +115,50 @@ void EnumLiteGenerator::Generate(io::Printer* printer) {
     WriteEnumValueDocComment(printer, aliases_[i].value);
     printer->Print(vars,
       "public static final $classname$ $name$ = $canonical_name$;\n");
+    printer->Annotate("name", aliases_[i].value);
   }
 
   for (int i = 0; i < descriptor_->value_count(); i++) {
     std::map<string, string> vars;
     vars["name"] = descriptor_->value(i)->name();
     vars["number"] = SimpleItoa(descriptor_->value(i)->number());
+    vars["{"] = "";
+    vars["}"] = "";
     WriteEnumValueDocComment(printer, descriptor_->value(i));
     printer->Print(vars,
-      "public static final int $name$_VALUE = $number$;\n");
+      "public static final int ${$$name$_VALUE$}$ = $number$;\n");
+    printer->Annotate("{", "}", descriptor_->value(i));
   }
   printer->Print("\n");
 
   // -----------------------------------------------------------------
 
   printer->Print(
-    "\n"
-    "public final int getNumber() {\n"
-    "  return value;\n"
-    "}\n"
-    "\n"
-    "/**\n"
-    " * @deprecated Use {@link #forNumber(int)} instead.\n"
-    " */\n"
-    "@java.lang.Deprecated\n"
-    "public static $classname$ valueOf(int value) {\n"
-    "  return forNumber(value);\n"
-    "}\n"
-    "\n"
-    "public static $classname$ forNumber(int value) {\n"
-    "  switch (value) {\n",
-    "classname", descriptor_->name());
+      "\n"
+      "@java.lang.Override\n"
+      "public final int getNumber() {\n");
+  if (SupportUnknownEnumValue(descriptor_->file())) {
+    printer->Print(
+        "  if (this == UNRECOGNIZED) {\n"
+        "    throw new java.lang.IllegalArgumentException(\n"
+        "        \"Can't get the number of an unknown enum value.\");\n"
+        "  }\n");
+  }
+  printer->Print(
+      "  return value;\n"
+      "}\n"
+      "\n"
+      "/**\n"
+      " * @deprecated Use {@link #forNumber(int)} instead.\n"
+      " */\n"
+      "@java.lang.Deprecated\n"
+      "public static $classname$ valueOf(int value) {\n"
+      "  return forNumber(value);\n"
+      "}\n"
+      "\n"
+      "public static $classname$ forNumber(int value) {\n"
+      "  switch (value) {\n",
+      "classname", descriptor_->name());
   printer->Indent();
   printer->Indent();
 
@@ -179,6 +183,7 @@ void EnumLiteGenerator::Generate(io::Printer* printer) {
     "private static final com.google.protobuf.Internal.EnumLiteMap<\n"
     "    $classname$> internalValueMap =\n"
     "      new com.google.protobuf.Internal.EnumLiteMap<$classname$>() {\n"
+    "        @java.lang.Override\n"
     "        public $classname$ findValueByNumber(int number) {\n"
     "          return $classname$.forNumber(number);\n"
     "        }\n"
diff --git a/src/google/protobuf/compiler/java/java_extension.cc b/src/google/protobuf/compiler/java/java_extension.cc
index cb237bf6..3eb1370d 100644
--- a/src/google/protobuf/compiler/java/java_extension.cc
+++ b/src/google/protobuf/compiler/java/java_extension.cc
@@ -75,7 +75,7 @@ void ExtensionGenerator::InitTemplateVars(
   vars["default"] = descriptor->is_repeated() ?
       "" : DefaultValue(descriptor, immutable, name_resolver);
   vars["type_constant"] = FieldTypeName(GetType(descriptor));
-  vars["packed"] = descriptor->options().packed() ? "true" : "false";
+  vars["packed"] = descriptor->is_packed() ? "true" : "false";
   vars["enum_map"] = "null";
   vars["prototype"] = "null";
 
@@ -141,6 +141,7 @@ void ImmutableExtensionGenerator::Generate(io::Printer* printer) {
         "      $singular_type$.class,\n"
         "      $prototype$);\n");
   }
+  printer->Annotate("name", descriptor_);
 }
 
 int ImmutableExtensionGenerator::GenerateNonNestedInitializationCode(
diff --git a/src/google/protobuf/compiler/java/java_extension_lite.cc b/src/google/protobuf/compiler/java/java_extension_lite.cc
index c48c92e9..70ce8e7d 100644
--- a/src/google/protobuf/compiler/java/java_extension_lite.cc
+++ b/src/google/protobuf/compiler/java/java_extension_lite.cc
@@ -96,6 +96,7 @@ void ImmutableExtensionLiteGenerator::Generate(io::Printer* printer) {
         "      com.google.protobuf.WireFormat.FieldType.$type_constant$,\n"
         "      $singular_type$.class);\n");
   }
+  printer->Annotate("name", descriptor_);
 }
 
 int ImmutableExtensionLiteGenerator::GenerateNonNestedInitializationCode(
diff --git a/src/google/protobuf/compiler/java/java_field.cc b/src/google/protobuf/compiler/java/java_field.cc
index 04917296..93de0229 100644
--- a/src/google/protobuf/compiler/java/java_field.cc
+++ b/src/google/protobuf/compiler/java/java_field.cc
@@ -35,9 +35,6 @@
 #include <google/protobuf/compiler/java/java_field.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -45,8 +42,6 @@
 #include <google/protobuf/compiler/java/java_enum_field.h>
 #include <google/protobuf/compiler/java/java_enum_field_lite.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
-#include <google/protobuf/compiler/java/java_lazy_message_field.h>
-#include <google/protobuf/compiler/java/java_lazy_message_field_lite.h>
 #include <google/protobuf/compiler/java/java_map_field.h>
 #include <google/protobuf/compiler/java/java_map_field_lite.h>
 #include <google/protobuf/compiler/java/java_message_field.h>
@@ -77,13 +72,8 @@ ImmutableFieldGenerator* MakeImmutableGenerator(
           return new ImmutableMapFieldGenerator(
               field, messageBitIndex, builderBitIndex, context);
         } else {
-          if (IsLazy(field, context->EnforceLite())) {
-            return new RepeatedImmutableLazyMessageFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new RepeatedImmutableMessageFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new RepeatedImmutableMessageFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         }
       case JAVATYPE_ENUM:
         return new RepeatedImmutableEnumFieldGenerator(
@@ -99,13 +89,8 @@ ImmutableFieldGenerator* MakeImmutableGenerator(
     if (field->containing_oneof()) {
       switch (GetJavaType(field)) {
         case JAVATYPE_MESSAGE:
-          if (IsLazy(field, context->EnforceLite())) {
-            return new ImmutableLazyMessageOneofFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new ImmutableMessageOneofFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new ImmutableMessageOneofFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         case JAVATYPE_ENUM:
           return new ImmutableEnumOneofFieldGenerator(
               field, messageBitIndex, builderBitIndex, context);
@@ -119,13 +104,8 @@ ImmutableFieldGenerator* MakeImmutableGenerator(
     } else {
       switch (GetJavaType(field)) {
         case JAVATYPE_MESSAGE:
-          if (IsLazy(field, context->EnforceLite())) {
-            return new ImmutableLazyMessageFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new ImmutableMessageFieldGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new ImmutableMessageFieldGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         case JAVATYPE_ENUM:
           return new ImmutableEnumFieldGenerator(
               field, messageBitIndex, builderBitIndex, context);
@@ -150,13 +130,8 @@ ImmutableFieldLiteGenerator* MakeImmutableLiteGenerator(
           return new ImmutableMapFieldLiteGenerator(
               field, messageBitIndex, builderBitIndex, context);
         } else {
-          if (IsLazy(field, context->EnforceLite())) {
-            return new RepeatedImmutableLazyMessageFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new RepeatedImmutableMessageFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new RepeatedImmutableMessageFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         }
       case JAVATYPE_ENUM:
         return new RepeatedImmutableEnumFieldLiteGenerator(
@@ -172,13 +147,8 @@ ImmutableFieldLiteGenerator* MakeImmutableLiteGenerator(
     if (field->containing_oneof()) {
       switch (GetJavaType(field)) {
         case JAVATYPE_MESSAGE:
-          if (IsLazy(field, context->EnforceLite())) {
-            return new ImmutableLazyMessageOneofFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new ImmutableMessageOneofFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new ImmutableMessageOneofFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         case JAVATYPE_ENUM:
           return new ImmutableEnumOneofFieldLiteGenerator(
               field, messageBitIndex, builderBitIndex, context);
@@ -192,13 +162,8 @@ ImmutableFieldLiteGenerator* MakeImmutableLiteGenerator(
     } else {
       switch (GetJavaType(field)) {
         case JAVATYPE_MESSAGE:
-          if (IsLazy(field, context->EnforceLite())) {
-            return new ImmutableLazyMessageFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          } else {
-            return new ImmutableMessageFieldLiteGenerator(
-                field, messageBitIndex, builderBitIndex, context);
-          }
+          return new ImmutableMessageFieldLiteGenerator(
+              field, messageBitIndex, builderBitIndex, context);
         case JAVATYPE_ENUM:
           return new ImmutableEnumFieldLiteGenerator(
               field, messageBitIndex, builderBitIndex, context);
@@ -246,8 +211,7 @@ template <>
 FieldGeneratorMap<ImmutableFieldGenerator>::FieldGeneratorMap(
     const Descriptor* descriptor, Context* context)
     : descriptor_(descriptor),
-      field_generators_(new google::protobuf::scoped_ptr<
-          ImmutableFieldGenerator>[descriptor->field_count()]) {
+      field_generators_(descriptor->field_count()) {
 
   // Construct all the FieldGenerators and assign them bit indices for their
   // bit fields.
@@ -269,8 +233,7 @@ template <>
 FieldGeneratorMap<ImmutableFieldLiteGenerator>::FieldGeneratorMap(
     const Descriptor* descriptor, Context* context)
     : descriptor_(descriptor),
-      field_generators_(new google::protobuf::scoped_ptr<
-          ImmutableFieldLiteGenerator>[descriptor->field_count()]) {
+      field_generators_(descriptor->field_count()) {
   // Construct all the FieldGenerators and assign them bit indices for their
   // bit fields.
   int messageBitIndex = 0;
@@ -293,10 +256,17 @@ void SetCommonFieldVariables(const FieldDescriptor* descriptor,
                              std::map<string, string>* variables) {
   (*variables)["field_name"] = descriptor->name();
   (*variables)["name"] = info->name;
+  (*variables)["classname"] = descriptor->containing_type()->name();
   (*variables)["capitalized_name"] = info->capitalized_name;
   (*variables)["disambiguated_reason"] = info->disambiguated_reason;
   (*variables)["constant_name"] = FieldConstantName(descriptor);
   (*variables)["number"] = SimpleItoa(descriptor->number());
+  // These variables are placeholders to pick out the beginning and ends of
+  // identifiers for annotations (when doing so with existing variables would
+  // be ambiguous or impossible). They should never be set to anything but the
+  // empty string.
+  (*variables)["{"] = "";
+  (*variables)["}"] = "";
 }
 
 void SetCommonOneofVariables(const FieldDescriptor* descriptor,
diff --git a/src/google/protobuf/compiler/java/java_field.h b/src/google/protobuf/compiler/java/java_field.h
index 434e610c..7275c099 100644
--- a/src/google/protobuf/compiler/java/java_field.h
+++ b/src/google/protobuf/compiler/java/java_field.h
@@ -37,9 +37,6 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
@@ -119,6 +116,7 @@ class ImmutableFieldLiteGenerator {
   virtual void GenerateEqualsCode(io::Printer* printer) const = 0;
   virtual void GenerateHashCode(io::Printer* printer) const = 0;
 
+
   virtual string GetBoxedType() const = 0;
 
  private:
@@ -140,7 +138,7 @@ class FieldGeneratorMap {
   const Descriptor* descriptor_;
   Context* context_;
   ClassNameResolver* name_resolver_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<FieldGeneratorType> > field_generators_;
+  std::vector<std::unique_ptr<FieldGeneratorType>> field_generators_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
 };
@@ -162,6 +160,14 @@ template<>
 FieldGeneratorMap<ImmutableFieldGenerator>::~FieldGeneratorMap();
 
 
+template <>
+FieldGeneratorMap<ImmutableFieldLiteGenerator>::FieldGeneratorMap(
+    const Descriptor* descriptor, Context* context);
+
+template <>
+FieldGeneratorMap<ImmutableFieldLiteGenerator>::~FieldGeneratorMap();
+
+
 // Field information used in FieldGeneartors.
 struct FieldGeneratorInfo {
   string name;
diff --git a/src/google/protobuf/compiler/java/java_file.cc b/src/google/protobuf/compiler/java/java_file.cc
index 86719f70..5583b779 100644
--- a/src/google/protobuf/compiler/java/java_file.cc
+++ b/src/google/protobuf/compiler/java/java_file.cc
@@ -35,9 +35,6 @@
 #include <google/protobuf/compiler/java/java_file.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
 
 #include <google/protobuf/compiler/java/java_context.h>
@@ -51,9 +48,9 @@
 #include <google/protobuf/compiler/java/java_service.h>
 #include <google/protobuf/compiler/java/java_shared_code_generator.h>
 #include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/dynamic_message.h>
 #include <google/protobuf/stubs/strutil.h>
 
@@ -136,7 +133,7 @@ void CollectExtensions(const FileDescriptorProto& file_proto,
            "descriptor.proto is not in the transitive dependencies. "
            "This normally should not happen. Please report a bug.";
     DynamicMessageFactory factory;
-    google::protobuf::scoped_ptr<Message> dynamic_file_proto(
+    std::unique_ptr<Message> dynamic_file_proto(
         factory.GetPrototype(file_proto_desc)->New());
     GOOGLE_CHECK(dynamic_file_proto.get() != NULL);
     GOOGLE_CHECK(dynamic_file_proto->ParseFromString(file_data));
@@ -154,12 +151,6 @@ void CollectExtensions(const FileDescriptorProto& file_proto,
   }
 }
 
-// Compare two field descriptors, returning true if the first should come
-// before the second.
-bool CompareFieldsByName(const FieldDescriptor *a, const FieldDescriptor *b) {
-  return a->full_name() < b->full_name();
-}
-
 // Our static initialization methods can become very, very large.
 // So large that if we aren't careful we end up blowing the JVM's
 // 64K bytes of bytecode/method. Fortunately, since these static
@@ -195,10 +186,8 @@ FileGenerator::FileGenerator(const FileDescriptor* file, const Options& options,
                              bool immutable_api)
     : file_(file),
       java_package_(FileJavaPackage(file, immutable_api)),
-      message_generators_(
-          new google::protobuf::scoped_ptr<MessageGenerator>[file->message_type_count()]),
-      extension_generators_(
-          new google::protobuf::scoped_ptr<ExtensionGenerator>[file->extension_count()]),
+      message_generators_(file->message_type_count()),
+      extension_generators_(file->extension_count()),
       context_(new Context(file, options)),
       name_resolver_(context_->GetNameResolver()),
       options_(options),
@@ -234,6 +223,16 @@ bool FileGenerator::Validate(string* error) {
       "option to specify a different outer class name for the .proto file.");
     return false;
   }
+  // Print a warning if optimize_for = LITE_RUNTIME is used.
+  if (file_->options().optimize_for() == FileOptions::LITE_RUNTIME) {
+    GOOGLE_LOG(WARNING)
+        << "The optimize_for = LITE_RUNTIME option is no longer supported by "
+        << "protobuf Java code generator and may generate broken code. It "
+        << "will be ignored by protoc in the future and protoc will always "
+        << "generate full runtime code for Java. To use Java Lite runtime, "
+        << "users should use the Java Lite plugin instead. See:\n"
+        << "  https://github.com/google/protobuf/blob/master/java/lite.md";
+  }
   return true;
 }
 
@@ -254,9 +253,12 @@ void FileGenerator::Generate(io::Printer* printer) {
   PrintGeneratedAnnotation(
       printer, '$', options_.annotate_code ? classname_ + ".java.pb.meta" : "");
   printer->Print(
-      "public final class $classname$ {\n"
+      "$deprecation$public final class $classname$ {\n"
       "  private $ctor$() {}\n",
-      "classname", classname_, "ctor", classname_);
+      "deprecation", file_->options().deprecated() ?
+          "@java.lang.Deprecated " : "",
+      "classname", classname_,
+      "ctor", classname_);
   printer->Annotate("classname", file_->name());
   printer->Indent();
 
@@ -312,7 +314,7 @@ void FileGenerator::Generate(io::Printer* printer) {
     }
     if (HasGenericServices(file_, context_->EnforceLite())) {
       for (int i = 0; i < file_->service_count(); i++) {
-        google::protobuf::scoped_ptr<ServiceGenerator> generator(
+        std::unique_ptr<ServiceGenerator> generator(
             generator_factory_->NewServiceGenerator(file_->service(i)));
         generator->Generate(printer);
       }
@@ -438,7 +440,7 @@ void FileGenerator::GenerateDescriptorInitializationCodeForImmutable(
       "    com.google.protobuf.ExtensionRegistry.newInstance();\n");
     FieldDescriptorSet::iterator it;
     for (it = extensions.begin(); it != extensions.end(); it++) {
-      google::protobuf::scoped_ptr<ExtensionGenerator> generator(
+      std::unique_ptr<ExtensionGenerator> generator(
           generator_factory_->NewExtensionGenerator(*it));
       bytecode_estimate += generator->GenerateRegistrationCode(printer);
       MaybeRestartJavaMethod(
@@ -505,19 +507,57 @@ void FileGenerator::GenerateDescriptorInitializationCodeForMutable(io::Printer*
     // Try to load immutable messages' outer class. Its initialization code
     // will take care of interpreting custom options.
     printer->Print(
-      "try {\n"
-      // Note that we have to load the immutable class dynamically here as
-      // we want the mutable code to be independent from the immutable code
-      // at compile time. It is required to implement dual-compile for
-      // mutable and immutable API in blaze.
-      "  java.lang.Class immutableClass = java.lang.Class.forName(\n"
-      "      \"$immutable_classname$\");\n"
-      "} catch (java.lang.ClassNotFoundException e) {\n"
-      // The immutable class can not be found. Custom options are left
-      // as unknown fields.
-      // TODO(xiaofeng): inform the user with a warning?
-      "}\n",
-      "immutable_classname", name_resolver_->GetImmutableClassName(file_));
+        "try {\n"
+        // Note that we have to load the immutable class dynamically here as
+        // we want the mutable code to be independent from the immutable code
+        // at compile time. It is required to implement dual-compile for
+        // mutable and immutable API in blaze.
+        "  java.lang.Class immutableClass = java.lang.Class.forName(\n"
+        "      \"$immutable_classname$\");\n"
+        "} catch (java.lang.ClassNotFoundException e) {\n",
+        "immutable_classname", name_resolver_->GetImmutableClassName(file_));
+    printer->Indent();
+
+    // The immutable class can not be found. We try our best to collect all
+    // custom option extensions to interpret the custom options.
+    printer->Print(
+        "com.google.protobuf.ExtensionRegistry registry =\n"
+        "    com.google.protobuf.ExtensionRegistry.newInstance();\n"
+        "com.google.protobuf.MessageLite defaultExtensionInstance = null;\n");
+    FieldDescriptorSet::iterator it;
+    for (it = extensions.begin(); it != extensions.end(); it++) {
+      const FieldDescriptor* field = *it;
+      string scope;
+      if (field->extension_scope() != NULL) {
+        scope = name_resolver_->GetMutableClassName(field->extension_scope()) +
+                ".getDescriptor()";
+      } else {
+        scope = FileJavaPackage(field->file(), true) + "." +
+                name_resolver_->GetDescriptorClassName(field->file()) +
+                ".descriptor";
+      }
+      if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+        printer->Print(
+            "defaultExtensionInstance = com.google.protobuf.Internal\n"
+            "    .getDefaultInstance(\"$class$\");\n"
+            "if (defaultExtensionInstance != null) {\n"
+            "  registry.add(\n"
+            "      $scope$.getExtensions().get($index$),\n"
+            "      (com.google.protobuf.Message) defaultExtensionInstance);\n"
+            "}\n",
+            "scope", scope, "index", SimpleItoa(field->index()), "class",
+            name_resolver_->GetImmutableClassName(field->message_type()));
+      } else {
+        printer->Print("registry.add($scope$.getExtensions().get($index$));\n",
+                       "scope", scope, "index", SimpleItoa(field->index()));
+      }
+    }
+    printer->Print(
+        "com.google.protobuf.Descriptors.FileDescriptor\n"
+        "    .internalUpdateFileDescriptor(descriptor, registry);\n");
+
+    printer->Outdent();
+    printer->Print("}\n");
   }
 
   // Force descriptor initialization of all dependencies.
@@ -553,7 +593,7 @@ static void GenerateSibling(const string& package_dir,
   io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
       &annotations);
 
-  google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
+  std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
   io::Printer printer(output.get(), '$',
                       annotate_code ? &annotation_collector : NULL);
 
@@ -572,7 +612,7 @@ static void GenerateSibling(const string& package_dir,
   (generator->*pfn)(&printer);
 
   if (annotate_code) {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> info_output(
+    std::unique_ptr<io::ZeroCopyOutputStream> info_output(
         context->Open(info_full_path));
     annotations.SerializeToZeroCopyStream(info_output.get());
     annotation_list->push_back(info_full_path);
@@ -615,7 +655,7 @@ void FileGenerator::GenerateSiblings(const string& package_dir,
     }
     if (HasGenericServices(file_, context_->EnforceLite())) {
       for (int i = 0; i < file_->service_count(); i++) {
-        google::protobuf::scoped_ptr<ServiceGenerator> generator(
+        std::unique_ptr<ServiceGenerator> generator(
             generator_factory_->NewServiceGenerator(file_->service(i)));
         GenerateSibling<ServiceGenerator>(
             package_dir, java_package_, file_->service(i), context, file_list,
diff --git a/src/google/protobuf/compiler/java/java_file.h b/src/google/protobuf/compiler/java/java_file.h
index e95aef09..78833a45 100644
--- a/src/google/protobuf/compiler/java/java_file.h
+++ b/src/google/protobuf/compiler/java/java_file.h
@@ -36,9 +36,6 @@
 #define GOOGLE_PROTOBUF_COMPILER_JAVA_FILE_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 #include <google/protobuf/stubs/common.h>
@@ -101,10 +98,10 @@ class FileGenerator {
   string java_package_;
   string classname_;
 
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<MessageGenerator> > message_generators_;
-  google::protobuf::scoped_array<google::protobuf::scoped_ptr<ExtensionGenerator> > extension_generators_;
-  google::protobuf::scoped_ptr<GeneratorFactory> generator_factory_;
-  google::protobuf::scoped_ptr<Context> context_;
+  std::vector<std::unique_ptr<MessageGenerator>> message_generators_;
+  std::vector<std::unique_ptr<ExtensionGenerator>> extension_generators_;
+  std::unique_ptr<GeneratorFactory> generator_factory_;
+  std::unique_ptr<Context> context_;
   ClassNameResolver* name_resolver_;
   const Options options_;
   bool immutable_api_;
diff --git a/src/google/protobuf/compiler/java/java_generator.cc b/src/google/protobuf/compiler/java/java_generator.cc
index 2c02d996..a5b2e784 100644
--- a/src/google/protobuf/compiler/java/java_generator.cc
+++ b/src/google/protobuf/compiler/java/java_generator.cc
@@ -35,18 +35,17 @@
 #include <google/protobuf/compiler/java/java_generator.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/java/java_file.h>
 #include <google/protobuf/compiler/java/java_generator_factory.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
+#include <google/protobuf/compiler/java/java_name_resolver.h>
 #include <google/protobuf/compiler/java/java_options.h>
 #include <google/protobuf/compiler/java/java_shared_code_generator.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
@@ -142,7 +141,7 @@ bool JavaGenerator::Generate(const FileDescriptor* file,
     }
 
     // Generate main java file.
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         context->Open(java_filename));
     GeneratedCodeInfo annotations;
     io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
@@ -158,7 +157,7 @@ bool JavaGenerator::Generate(const FileDescriptor* file,
                                      &all_annotations);
 
     if (file_options.annotate_code) {
-      google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> info_output(
+      std::unique_ptr<io::ZeroCopyOutputStream> info_output(
           context->Open(info_full_path));
       annotations.SerializeToZeroCopyStream(info_output.get());
     }
@@ -173,7 +172,7 @@ bool JavaGenerator::Generate(const FileDescriptor* file,
   if (!file_options.output_list_file.empty()) {
     // Generate output list.  This is just a simple text file placed in a
     // deterministic location which lists the .java files being generated.
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
+    std::unique_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
         context->Open(file_options.output_list_file));
     io::Printer srclist_printer(srclist_raw_output.get(), '$');
     for (int i = 0; i < all_files.size(); i++) {
@@ -184,7 +183,7 @@ bool JavaGenerator::Generate(const FileDescriptor* file,
   if (!file_options.annotation_list_file.empty()) {
     // Generate output list.  This is just a simple text file placed in a
     // deterministic location which lists the .java files being generated.
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> annotation_list_raw_output(
+    std::unique_ptr<io::ZeroCopyOutputStream> annotation_list_raw_output(
         context->Open(file_options.annotation_list_file));
     io::Printer annotation_list_printer(annotation_list_raw_output.get(), '$');
     for (int i = 0; i < all_annotations.size(); i++) {
diff --git a/src/google/protobuf/compiler/java/java_helpers.cc b/src/google/protobuf/compiler/java/java_helpers.cc
index efb5fd45..957076cb 100644
--- a/src/google/protobuf/compiler/java/java_helpers.cc
+++ b/src/google/protobuf/compiler/java/java_helpers.cc
@@ -37,6 +37,7 @@
 #include <limits>
 #include <vector>
 
+#include <google/protobuf/stubs/stringprintf.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
 #include <google/protobuf/descriptor.pb.h>
@@ -44,6 +45,9 @@
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 
+
+#include <google/protobuf/stubs/hash.h>  // for hash<T *>
+
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -71,6 +75,8 @@ const char* kForbiddenWordList[] = {
   "class",
 };
 
+const int kDefaultLookUpStartFieldNumber = 40;
+
 bool IsForbidden(const string& field_name) {
   for (int i = 0; i < GOOGLE_ARRAYSIZE(kForbiddenWordList); ++i) {
     if (field_name == kForbiddenWordList[i]) {
@@ -99,6 +105,20 @@ string FieldName(const FieldDescriptor* field) {
 }
 
 
+// Judge whether should use table or use look up.
+// Copied from com.google.protobuf.SchemaUtil.shouldUseTableSwitch
+bool ShouldUseTable(int lo, int hi, int number_of_fields) {
+  if (hi < kDefaultLookUpStartFieldNumber) {
+    return true;
+  }
+  int64 table_space_cost = (static_cast<int64>(hi) - lo + 1);  // words
+  int64 table_time_cost = 3;           // comparisons
+  int64 lookup_space_cost = 3 + 2 * static_cast<int64>(number_of_fields);
+  int64 lookup_time_cost = 3 + number_of_fields;
+  return table_space_cost + 3 * table_time_cost <=
+         lookup_space_cost + 3 * lookup_time_cost;
+}
+
 }  // namespace
 
 void PrintGeneratedAnnotation(io::Printer* printer, char delimiter,
@@ -166,6 +186,14 @@ string UniqueFileScopeIdentifier(const Descriptor* descriptor) {
   return "static_" + StringReplace(descriptor->full_name(), ".", "_", true);
 }
 
+string CamelCaseFieldName(const FieldDescriptor* field) {
+  string fieldName = UnderscoresToCamelCase(field);
+  if ('0' <= fieldName[0] && fieldName[0] <= '9') {
+    return '_' + fieldName;
+  }
+  return fieldName;
+}
+
 string StripProto(const string& filename) {
   if (HasSuffixString(filename, ".protodevel")) {
     return StripSuffixString(filename, ".protodevel");
@@ -245,6 +273,7 @@ string ClassName(const FileDescriptor* descriptor) {
   return name_resolver.GetClassName(descriptor, true);
 }
 
+
 string ExtraMessageInterfaces(const Descriptor* descriptor) {
   string interfaces = "// @@protoc_insertion_point(message_implements:"
       + descriptor->full_name() + ")";
@@ -771,6 +800,154 @@ bool HasRepeatedFields(const Descriptor* descriptor) {
   return false;
 }
 
+// Encode an unsigned 32-bit value into a sequence of UTF-16 characters.
+//
+// If the value is in [0x0000, 0xD7FF], we encode it with a single character
+// with the same numeric value.
+//
+// If the value is larger than 0xD7FF, we encode its lowest 13 bits into a
+// character in the range [0xE000, 0xFFFF] by combining these 13 bits with
+// 0xE000 using logic-or. Then we shift the value to the right by 13 bits, and
+// encode the remaining value by repeating this same process until we get to
+// a value in [0x0000, 0xD7FF] where we will encode it using a character with
+// the same numeric value.
+//
+// Note that we only use code points in [0x0000, 0xD7FF] and [0xE000, 0xFFFF].
+// There will be no surrogate pairs in the encoded character sequence.
+void WriteUInt32ToUtf16CharSequence(uint32 number,
+                                    std::vector<uint16>* output) {
+  // For values in [0x0000, 0xD7FF], only use one char to encode it.
+  if (number < 0xD800) {
+    output->push_back(static_cast<uint16>(number));
+    return;
+  }
+  // Encode into multiple chars. All except the last char will be in the range
+  // [0xE000, 0xFFFF], and the last char will be in the range [0x0000, 0xD7FF].
+  // Note that we don't use any value in range [0xD800, 0xDFFF] because they
+  // have to come in pairs and the encoding is just more space-efficient w/o
+  // them.
+  while (number >= 0xD800) {
+    // [0xE000, 0xFFFF] can represent 13 bits of info.
+    output->push_back(static_cast<uint16>(0xE000 | (number & 0x1FFF)));
+    number >>= 13;
+  }
+  output->push_back(static_cast<uint16>(number));
+}
+
+int GetExperimentalJavaFieldTypeForSingular(const FieldDescriptor* field) {
+  // j/c/g/protobuf/FieldType.java lists field types in a slightly different
+  // order from FieldDescriptor::Type so we can't do a simple cast.
+  //
+  // TODO(xiaofeng): Make j/c/g/protobuf/FieldType.java follow the same order.
+  int result = field->type();
+  if (result == FieldDescriptor::TYPE_GROUP) {
+    return 17;
+  } else if (result < FieldDescriptor::TYPE_GROUP) {
+    return result - 1;
+  } else {
+    return result - 2;
+  }
+}
+
+int GetExperimentalJavaFieldTypeForRepeated(const FieldDescriptor* field) {
+  if (field->type() == FieldDescriptor::TYPE_GROUP) {
+    return 49;
+  } else {
+    return GetExperimentalJavaFieldTypeForSingular(field) + 18;
+  }
+}
+
+int GetExperimentalJavaFieldTypeForPacked(const FieldDescriptor* field) {
+  int result = field->type();
+  if (result < FieldDescriptor::TYPE_STRING) {
+    return result + 34;
+  } else if (result > FieldDescriptor::TYPE_BYTES) {
+    return result + 30;
+  } else {
+    GOOGLE_LOG(FATAL) << field->full_name() << " can't be packed.";
+    return 0;
+  }
+}
+
+int GetExperimentalJavaFieldType(const FieldDescriptor* field) {
+  static const int kMapFieldType = 50;
+  static const int kOneofFieldTypeOffset = 51;
+  static const int kRequiredBit = 0x100;
+  static const int kUtf8CheckBit = 0x200;
+  static const int kCheckInitialized = 0x400;
+  static const int kMapWithProto2EnumValue = 0x800;
+  int extra_bits = field->is_required() ? kRequiredBit : 0;
+  if (field->type() == FieldDescriptor::TYPE_STRING && CheckUtf8(field)) {
+    extra_bits |= kUtf8CheckBit;
+  }
+  if (field->is_required() || (GetJavaType(field) == JAVATYPE_MESSAGE &&
+                               HasRequiredFields(field->message_type()))) {
+    extra_bits |= kCheckInitialized;
+  }
+
+  if (field->is_map()) {
+    if (SupportFieldPresence(field->file())) {
+      const FieldDescriptor* value =
+          field->message_type()->FindFieldByName("value");
+      if (GetJavaType(value) == JAVATYPE_ENUM) {
+        extra_bits |= kMapWithProto2EnumValue;
+      }
+    }
+    return kMapFieldType | extra_bits;
+  } else if (field->is_packed()) {
+    return GetExperimentalJavaFieldTypeForPacked(field);
+  } else if (field->is_repeated()) {
+    return GetExperimentalJavaFieldTypeForRepeated(field) | extra_bits;
+  } else if (field->containing_oneof() != NULL) {
+    return (GetExperimentalJavaFieldTypeForSingular(field) +
+            kOneofFieldTypeOffset) |
+           extra_bits;
+  } else {
+    return GetExperimentalJavaFieldTypeForSingular(field) | extra_bits;
+  }
+}
+
+// Escape a UTF-16 character to be embedded in a Java string.
+void EscapeUtf16ToString(uint16 code, string* output) {
+  if (code == '\t') {
+    output->append("\\t");
+  } else if (code == '\b') {
+    output->append("\\b");
+  } else if (code == '\n') {
+    output->append("\\n");
+  } else if (code == '\r') {
+    output->append("\\r");
+  } else if (code == '\f') {
+    output->append("\\f");
+  } else if (code == '\'') {
+    output->append("\\'");
+  } else if (code == '\"') {
+    output->append("\\\"");
+  } else if (code == '\\') {
+    output->append("\\\\");
+  } else if (code >= 0x20 && code <= 0x7f) {
+    output->push_back(static_cast<char>(code));
+  } else {
+    output->append(StringPrintf("\\u%04x", code));
+  }
+}
+
+std::pair<int, int> GetTableDrivenNumberOfEntriesAndLookUpStartFieldNumber(
+    const FieldDescriptor** fields, int count) {
+  GOOGLE_CHECK_GT(count, 0);
+  int table_driven_number_of_entries = count;
+  int look_up_start_field_number = 0;
+  for (int i = 0; i < count; i++) {
+    const int field_number = fields[i]->number();
+    if (ShouldUseTable(fields[0]->number(), field_number, i + 1)) {
+      table_driven_number_of_entries =
+          field_number - fields[0]->number() + 1 + count - i - 1;
+      look_up_start_field_number = field_number + 1;
+    }
+  }
+  return std::make_pair(
+      table_driven_number_of_entries, look_up_start_field_number);
+}
 }  // namespace java
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/java/java_helpers.h b/src/google/protobuf/compiler/java/java_helpers.h
index 829ec3d7..dd9b65b8 100644
--- a/src/google/protobuf/compiler/java/java_helpers.h
+++ b/src/google/protobuf/compiler/java/java_helpers.h
@@ -37,8 +37,8 @@
 
 #include <string>
 #include <google/protobuf/compiler/java/java_context.h>
-#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/printer.h>
 #include <google/protobuf/descriptor.h>
 
 namespace google {
@@ -74,6 +74,10 @@ string UnderscoresToCapitalizedCamelCase(const FieldDescriptor* field);
 // of lower-casing the first letter of the name.)
 string UnderscoresToCamelCase(const MethodDescriptor* method);
 
+// Similar to UnderscoresToCamelCase, but guarentees that the result is a
+// complete Java identifier by adding a _ if needed.
+string CamelCaseFieldName(const FieldDescriptor* field);
+
 // Get an identifier that uniquely identifies this type within the file.
 // This is used to declare static variables related to this type at the
 // outermost file scope.
@@ -132,6 +136,13 @@ inline string ShortMutableJavaClassName(const Descriptor* descriptor) {
   return descriptor->name();
 }
 
+// Whether the given descriptor is for one of the core descriptor protos. We
+// cannot currently use the new runtime with core protos since there is a
+// bootstrapping problem with obtaining their descriptors.
+inline bool IsDescriptorProto(const Descriptor* descriptor) {
+  return descriptor->file()->name() == "google/protobuf/descriptor.proto";
+}
+
 
 // Whether we should generate multiple java files for messages.
 inline bool MultipleJavaFiles(
@@ -242,15 +253,6 @@ inline bool HasGenericServices(const FileDescriptor *file, bool enforce_lite) {
          file->options().java_generic_services();
 }
 
-inline bool IsLazy(const FieldDescriptor* descriptor, bool enforce_lite) {
-  // Currently, the proto-lite version supports lazy field.
-  // TODO(niwasaki): Support lazy fields also for other proto runtimes.
-  if (HasDescriptorMethods(descriptor->file(), enforce_lite)) {
-    return false;
-  }
-  return descriptor->options().lazy();
-}
-
 // Methods for shared bitfields.
 
 // Gets the name of the shared bitfield for the given index.
@@ -372,14 +374,14 @@ inline bool IsMapField(const FieldDescriptor* descriptor) {
   return descriptor->is_map();
 }
 
-inline bool PreserveUnknownFields(const Descriptor* descriptor) {
-  return descriptor->file()->syntax() != FileDescriptor::SYNTAX_PROTO3;
-}
-
 inline bool IsAnyMessage(const Descriptor* descriptor) {
   return descriptor->full_name() == "google.protobuf.Any";
 }
 
+inline bool IsWrappersProtoFile(const FileDescriptor* descriptor) {
+  return descriptor->name() == "google/protobuf/wrappers.proto";
+}
+
 inline bool CheckUtf8(const FieldDescriptor* descriptor) {
   return descriptor->file()->syntax() == FileDescriptor::SYNTAX_PROTO3 ||
       descriptor->file()->options().java_string_check_utf8();
@@ -388,6 +390,35 @@ inline bool CheckUtf8(const FieldDescriptor* descriptor) {
 inline string GeneratedCodeVersionSuffix() {
   return "V3";
 }
+
+inline bool EnableExperimentalRuntime(Context* context) {
+  return false;
+}
+
+void WriteUInt32ToUtf16CharSequence(uint32 number, std::vector<uint16>* output);
+
+inline void WriteIntToUtf16CharSequence(int value,
+                                        std::vector<uint16>* output) {
+  WriteUInt32ToUtf16CharSequence(static_cast<uint32>(value), output);
+}
+
+// Escape a UTF-16 character so it can be embedded in a Java string literal.
+void EscapeUtf16ToString(uint16 code, string* output);
+
+// Only the lowest two bytes of the return value are used. The lowest byte
+// is the integer value of a j/c/g/protobuf/FieldType enum. For the other
+// byte:
+//    bit 0: whether the field is required.
+//    bit 1: whether the field requires UTF-8 validation.
+//    bit 2: whether the field needs isInitialized check.
+//    bit 3: whether the field is a map field with proto2 enum value.
+//    bits 4-7: unused
+int GetExperimentalJavaFieldType(const FieldDescriptor* field);
+
+// To get the total number of entries need to be built for experimental runtime
+// and the first field number that are not in the table part
+std::pair<int, int> GetTableDrivenNumberOfEntriesAndLookUpStartFieldNumber(
+    const FieldDescriptor** fields, int count);
 }  // namespace java
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/java/java_lazy_message_field_lite.cc b/src/google/protobuf/compiler/java/java_lazy_message_field_lite.cc
index 49070ba0..51bb11f1 100644
--- a/src/google/protobuf/compiler/java/java_lazy_message_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_lazy_message_field_lite.cc
@@ -232,6 +232,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
     "}\n");
 }
 
+
 // ===================================================================
 
 ImmutableLazyMessageOneofFieldLiteGenerator::
@@ -415,6 +416,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
     "}\n");
 }
 
+
 // ===================================================================
 
 RepeatedImmutableLazyMessageFieldLiteGenerator::
@@ -716,6 +718,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
     "}\n");
 }
 
+
 }  // namespace java
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/java/java_lazy_message_field_lite.h b/src/google/protobuf/compiler/java/java_lazy_message_field_lite.h
index 47ebeb49..65b84fbc 100644
--- a/src/google/protobuf/compiler/java/java_lazy_message_field_lite.h
+++ b/src/google/protobuf/compiler/java/java_lazy_message_field_lite.h
@@ -68,6 +68,7 @@ class ImmutableLazyMessageFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutableLazyMessageFieldLiteGenerator);
 };
@@ -87,6 +88,7 @@ class ImmutableLazyMessageOneofFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutableLazyMessageOneofFieldLiteGenerator);
 };
@@ -106,6 +108,7 @@ class RepeatedImmutableLazyMessageFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedImmutableLazyMessageFieldLiteGenerator);
 };
diff --git a/src/google/protobuf/compiler/java/java_map_field.cc b/src/google/protobuf/compiler/java/java_map_field.cc
index 3fe68ae3..b22a2199 100644
--- a/src/google/protobuf/compiler/java/java_map_field.cc
+++ b/src/google/protobuf/compiler/java/java_map_field.cc
@@ -183,12 +183,14 @@ GenerateInterfaceMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
-      "$deprecation$int get$capitalized_name$Count();\n");
+      "$deprecation$int ${$get$capitalized_name$Count$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
-      "$deprecation$boolean contains$capitalized_name$(\n"
+      "$deprecation$boolean ${$contains$capitalized_name$$}$(\n"
       "    $key_type$ key);\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -197,23 +199,27 @@ GenerateInterfaceMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$();\n");
+        "${$get$capitalized_name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$Map();\n");
+        "${$get$capitalized_name$Map$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$$value_enum_type$ get$capitalized_name$OrDefault(\n"
+        "$deprecation$$value_enum_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ defaultValue);\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$$value_enum_type$ get$capitalized_name$OrThrow(\n"
+        "$deprecation$$value_enum_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key);\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
@@ -222,25 +228,29 @@ GenerateInterfaceMembers(io::Printer* printer) const {
           " */\n"
           "@java.lang.Deprecated\n"
           "java.util.Map<$type_parameters$>\n"
-          "get$capitalized_name$Value();\n");
+          "${$get$capitalized_name$Value$}$();\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$java.util.Map<$type_parameters$>\n"
-          "get$capitalized_name$ValueMap();\n");
+          "${$get$capitalized_name$ValueMap$}$();\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "$value_type$ get$capitalized_name$ValueOrDefault(\n"
+          "$value_type$ ${$get$capitalized_name$ValueOrDefault$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ defaultValue);\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "$value_type$ get$capitalized_name$ValueOrThrow(\n"
+          "$value_type$ ${$get$capitalized_name$ValueOrThrow$}$(\n"
           "    $key_type$ key);\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -250,25 +260,29 @@ GenerateInterfaceMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "java.util.Map<$type_parameters$>\n"
-        "get$capitalized_name$();\n");
+        "${$get$capitalized_name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$java.util.Map<$type_parameters$>\n"
-        "get$capitalized_name$Map();\n");
+        "${$get$capitalized_name$Map$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "$value_type$ get$capitalized_name$OrDefault(\n"
+        "$value_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ defaultValue);\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "$value_type$ get$capitalized_name$OrThrow(\n"
+        "$value_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key);\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -349,23 +363,27 @@ GenerateBuilderMembers(io::Printer* printer) const {
       "  return $name$_;\n"
       "}\n");
   GenerateMapGetters(printer);
-  printer->Print(variables_,
-                 "$deprecation$\n"
-                 "public Builder clear$capitalized_name$() {\n"
-                 "  internalGetMutable$capitalized_name$().getMutableMap()\n"
-                 "      .clear();\n"
-                 "  return this;\n"
-                 "}\n");
+  printer->Print(
+      variables_,
+      "$deprecation$\n"
+      "public Builder ${$clear$capitalized_name$$}$() {\n"
+      "  internalGetMutable$capitalized_name$().getMutableMap()\n"
+      "      .clear();\n"
+      "  return this;\n"
+      "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
-  printer->Print(variables_,
-                 "$deprecation$\n"
-                 "public Builder remove$capitalized_name$(\n"
-                 "    $key_type$ key) {\n"
-                 "  $key_null_check$\n"
-                 "  internalGetMutable$capitalized_name$().getMutableMap()\n"
-                 "      .remove(key);\n"
-                 "  return this;\n"
-                 "}\n");
+  printer->Print(
+      variables_,
+      "$deprecation$\n"
+      "public Builder ${$remove$capitalized_name$$}$(\n"
+      "    $key_type$ key) {\n"
+      "  $key_null_check$\n"
+      "  internalGetMutable$capitalized_name$().getMutableMap()\n"
+      "      .remove(key);\n"
+      "  return this;\n"
+      "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -374,13 +392,14 @@ GenerateBuilderMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "getMutable$capitalized_name$() {\n"
+        "${$getMutable$capitalized_name$$}$() {\n"
         "  return internalGetAdapted$capitalized_name$Map(\n"
         "       internalGetMutable$capitalized_name$().getMutableMap());\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-                   "$deprecation$public Builder put$capitalized_name$(\n"
+                   "$deprecation$public Builder ${$put$capitalized_name$$}$(\n"
                    "    $key_type$ key,\n"
                    "    $value_enum_type$ value) {\n"
                    "  $key_null_check$\n"
@@ -389,16 +408,18 @@ GenerateBuilderMembers(io::Printer* printer) const {
                    "      .put(key, $name$ValueConverter.doBackward(value));\n"
                    "  return this;\n"
                    "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$public Builder putAll$capitalized_name$(\n"
+        "$deprecation$public Builder ${$putAll$capitalized_name$$}$(\n"
         "    java.util.Map<$boxed_key_type$, $value_enum_type$> values) {\n"
         "  internalGetAdapted$capitalized_name$Map(\n"
         "      internalGetMutable$capitalized_name$().getMutableMap())\n"
         "          .putAll(values);\n"
         "  return this;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
@@ -407,32 +428,32 @@ GenerateBuilderMembers(io::Printer* printer) const {
           " */\n"
           "@java.lang.Deprecated\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "getMutable$capitalized_name$Value() {\n"
+          "${$getMutable$capitalized_name$Value$}$() {\n"
           "  return internalGetMutable$capitalized_name$().getMutableMap();\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
-          "$deprecation$public Builder put$capitalized_name$Value(\n"
+          "$deprecation$public Builder ${$put$capitalized_name$Value$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ value) {\n"
           "  $key_null_check$\n"
-          "  if ($value_enum_type$.forNumber(value) == null) {\n"
-          "    throw new java.lang.IllegalArgumentException();\n"
-          "  }\n"
           "  internalGetMutable$capitalized_name$().getMutableMap()\n"
           "      .put(key, value);\n"
           "  return this;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
-          "$deprecation$public Builder putAll$capitalized_name$Value(\n"
+          "$deprecation$public Builder ${$putAll$capitalized_name$Value$}$(\n"
           "    java.util.Map<$boxed_key_type$, $boxed_value_type$> values) {\n"
           "  internalGetMutable$capitalized_name$().getMutableMap()\n"
           "      .putAll(values);\n"
           "  return this;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -442,30 +463,35 @@ GenerateBuilderMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "public java.util.Map<$type_parameters$>\n"
-        "getMutable$capitalized_name$() {\n"
+        "${$getMutable$capitalized_name$$}$() {\n"
         "  return internalGetMutable$capitalized_name$().getMutableMap();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-                   "$deprecation$"
-                   "public Builder put$capitalized_name$(\n"
-                   "    $key_type$ key,\n"
-                   "    $value_type$ value) {\n"
-                   "  $key_null_check$\n"
-                   "  $value_null_check$\n"
-                   "  internalGetMutable$capitalized_name$().getMutableMap()\n"
-                   "      .put(key, value);\n"
-                   "  return this;\n"
-                   "}\n");
+    printer->Print(
+        variables_,
+        "$deprecation$"
+        "public Builder ${$put$capitalized_name$$}$(\n"
+        "    $key_type$ key,\n"
+        "    $value_type$ value) {\n"
+        "  $key_null_check$\n"
+        "  $value_null_check$\n"
+        "  internalGetMutable$capitalized_name$().getMutableMap()\n"
+        "      .put(key, value);\n"
+        "  return this;\n"
+        "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-                   "$deprecation$\n"
-                   "public Builder putAll$capitalized_name$(\n"
-                   "    java.util.Map<$type_parameters$> values) {\n"
-                   "  internalGetMutable$capitalized_name$().getMutableMap()\n"
-                   "      .putAll(values);\n"
-                   "  return this;\n"
-                   "}\n");
+    printer->Print(
+        variables_,
+        "$deprecation$\n"
+        "public Builder ${$putAll$capitalized_name$$}$(\n"
+        "    java.util.Map<$type_parameters$> values) {\n"
+        "  internalGetMutable$capitalized_name$().getMutableMap()\n"
+        "      .putAll(values);\n"
+        "  return this;\n"
+        "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -474,18 +500,20 @@ GenerateMapGetters(io::Printer* printer) const {
   printer->Print(
       variables_,
       "$deprecation$\n"
-      "public int get$capitalized_name$Count() {\n"
+      "public int ${$get$capitalized_name$Count$}$() {\n"
       "  return internalGet$capitalized_name$().getMap().size();\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
       "$deprecation$\n"
-      "public boolean contains$capitalized_name$(\n"
+      "public boolean ${$contains$capitalized_name$$}$(\n"
       "    $key_type$ key) {\n"
       "  $key_null_check$\n"
       "  return internalGet$capitalized_name$().getMap().containsKey(key);\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -494,22 +522,25 @@ GenerateMapGetters(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$() {\n"
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-                   "$deprecation$\n"
-                   "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-                   "get$capitalized_name$Map() {\n"
-                   "  return internalGetAdapted$capitalized_name$Map(\n"
-                   "      internalGet$capitalized_name$().getMap());"
-                   "}\n");
+    printer->Print(
+        variables_,
+        "$deprecation$\n"
+        "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
+        "${$get$capitalized_name$Map$}$() {\n"
+        "  return internalGetAdapted$capitalized_name$Map(\n"
+        "      internalGet$capitalized_name$().getMap());"
+        "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -519,11 +550,12 @@ GenerateMapGetters(io::Printer* printer) const {
         "         ? $name$ValueConverter.doForward(map.get(key))\n"
         "         : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$boxed_key_type$, $boxed_value_type$> map =\n"
@@ -533,6 +565,7 @@ GenerateMapGetters(io::Printer* printer) const {
         "  }\n"
         "  return $name$ValueConverter.doForward(map.get(key));\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
@@ -541,22 +574,24 @@ GenerateMapGetters(io::Printer* printer) const {
           " */\n"
           "@java.lang.Deprecated\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$Value() {\n"
+          "${$get$capitalized_name$Value$}$() {\n"
           "  return get$capitalized_name$ValueMap();\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$ValueMap() {\n"
+          "${$get$capitalized_name$ValueMap$}$() {\n"
           "  return internalGet$capitalized_name$().getMap();\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrDefault(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrDefault$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ defaultValue) {\n"
           "  $key_null_check$\n"
@@ -564,11 +599,12 @@ GenerateMapGetters(io::Printer* printer) const {
           "      internalGet$capitalized_name$().getMap();\n"
           "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrThrow(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrThrow$}$(\n"
           "    $key_type$ key) {\n"
           "  $key_null_check$\n"
           "  java.util.Map<$boxed_key_type$, $boxed_value_type$> map =\n"
@@ -578,6 +614,7 @@ GenerateMapGetters(io::Printer* printer) const {
           "  }\n"
           "  return map.get(key);\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -586,21 +623,25 @@ GenerateMapGetters(io::Printer* printer) const {
         " * Use {@link #get$capitalized_name$Map()} instead.\n"
         " */\n"
         "@java.lang.Deprecated\n"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$Map() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$Map$}$() {\n"
         "  return internalGet$capitalized_name$().getMap();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -608,11 +649,12 @@ GenerateMapGetters(io::Printer* printer) const {
         "      internalGet$capitalized_name$().getMap();\n"
         "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$type_parameters$> map =\n"
@@ -622,6 +664,7 @@ GenerateMapGetters(io::Printer* printer) const {
         "  }\n"
         "  return map.get(key);\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
diff --git a/src/google/protobuf/compiler/java/java_map_field_lite.cc b/src/google/protobuf/compiler/java/java_map_field_lite.cc
index 523052cc..e2e68076 100644
--- a/src/google/protobuf/compiler/java/java_map_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_map_field_lite.cc
@@ -166,12 +166,14 @@ GenerateInterfaceMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
-      "$deprecation$int get$capitalized_name$Count();\n");
+      "$deprecation$int ${$get$capitalized_name$Count$}$();\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
-      "$deprecation$boolean contains$capitalized_name$(\n"
+      "$deprecation$boolean ${$contains$capitalized_name$$}$(\n"
       "    $key_type$ key);\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -180,23 +182,27 @@ GenerateInterfaceMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$();\n");
+        "${$get$capitalized_name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$Map();\n");
+        "${$get$capitalized_name$Map$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$$value_enum_type$ get$capitalized_name$OrDefault(\n"
+        "$deprecation$$value_enum_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ defaultValue);\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$$value_enum_type$ get$capitalized_name$OrThrow(\n"
+        "$deprecation$$value_enum_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key);\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
@@ -205,25 +211,29 @@ GenerateInterfaceMembers(io::Printer* printer) const {
           " */\n"
           "@java.lang.Deprecated\n"
           "java.util.Map<$type_parameters$>\n"
-          "get$capitalized_name$Value();\n");
+          "${$get$capitalized_name$Value$}$();\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$java.util.Map<$type_parameters$>\n"
-          "get$capitalized_name$ValueMap();\n");
+          "${$get$capitalized_name$ValueMap$}$();\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "$value_type$ get$capitalized_name$ValueOrDefault(\n"
+          "$value_type$ ${$get$capitalized_name$ValueOrDefault$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ defaultValue);\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
           "$deprecation$\n"
-          "$value_type$ get$capitalized_name$ValueOrThrow(\n"
+          "$value_type$ ${$get$capitalized_name$ValueOrThrow$}$(\n"
           "    $key_type$ key);\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -233,25 +243,29 @@ GenerateInterfaceMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "java.util.Map<$type_parameters$>\n"
-        "get$capitalized_name$();\n");
+        "${$get$capitalized_name$$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$java.util.Map<$type_parameters$>\n"
-        "get$capitalized_name$Map();\n");
+        "${$get$capitalized_name$Map$}$();\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "$value_type$ get$capitalized_name$OrDefault(\n"
+        "$value_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ defaultValue);\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$\n"
-        "$value_type$ get$capitalized_name$OrThrow(\n"
+        "$value_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key);\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -287,19 +301,23 @@ GenerateMembers(io::Printer* printer) const {
       "}\n");
   printer->Print(
       variables_,
+      "@java.lang.Override\n"
       "$deprecation$\n"
-      "public int get$capitalized_name$Count() {\n"
+      "public int ${$get$capitalized_name$Count$}$() {\n"
       "  return internalGet$capitalized_name$().size();\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
+      "@java.lang.Override\n"
       "$deprecation$\n"
-      "public boolean contains$capitalized_name$(\n"
+      "public boolean ${$contains$capitalized_name$$}$(\n"
       "    $key_type$ key) {\n"
       "  $key_null_check$\n"
       "  return internalGet$capitalized_name$().containsKey(key);\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -316,26 +334,30 @@ GenerateMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$() {\n"
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$Map() {\n"
+        "${$get$capitalized_name$Map$}$() {\n"
         "  return java.util.Collections.unmodifiableMap(\n"
         "      new com.google.protobuf.Internal.MapAdapter<\n"
         "        $boxed_key_type$, $value_enum_type$, java.lang.Integer>(\n"
         "            internalGet$capitalized_name$(),\n"
         "            $name$ValueConverter));\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -345,11 +367,13 @@ GenerateMembers(io::Printer* printer) const {
         "         ? $name$ValueConverter.doForward(map.get(key))\n"
         "         : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$boxed_key_type$, $boxed_value_type$> map =\n"
@@ -359,31 +383,37 @@ GenerateMembers(io::Printer* printer) const {
         "  }\n"
         "  return $name$ValueConverter.doForward(map.get(key));\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
           "/**\n"
           " * Use {@link #get$capitalized_name$ValueMap()} instead.\n"
           " */\n"
+          "@java.lang.Override\n"
           "@java.lang.Deprecated\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$Value() {\n"
+          "${$get$capitalized_name$Value$}$() {\n"
           "  return get$capitalized_name$ValueMap();\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$ValueMap() {\n"
+          "${$get$capitalized_name$ValueMap$}$() {\n"
           "  return java.util.Collections.unmodifiableMap(\n"
           "      internalGet$capitalized_name$());\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrDefault(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrDefault$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ defaultValue) {\n"
           "  $key_null_check$\n"
@@ -391,11 +421,13 @@ GenerateMembers(io::Printer* printer) const {
           "      internalGet$capitalized_name$();\n"
           "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrThrow(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrThrow$}$(\n"
           "    $key_type$ key) {\n"
           "  $key_null_check$\n"
           "  java.util.Map<$boxed_key_type$, $boxed_value_type$> map =\n"
@@ -405,6 +437,7 @@ GenerateMembers(io::Printer* printer) const {
           "  }\n"
           "  return map.get(key);\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -412,23 +445,30 @@ GenerateMembers(io::Printer* printer) const {
         "/**\n"
         " * Use {@link #get$capitalized_name$Map()} instead.\n"
         " */\n"
+        "@java.lang.Override\n"
         "@java.lang.Deprecated\n"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$Map() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$Map$}$() {\n"
         "  return java.util.Collections.unmodifiableMap(\n"
         "      internalGet$capitalized_name$());\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -436,11 +476,13 @@ GenerateMembers(io::Printer* printer) const {
         "      internalGet$capitalized_name$();\n"
         "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$type_parameters$> map =\n"
@@ -450,6 +492,7 @@ GenerateMembers(io::Printer* printer) const {
         "  }\n"
         "  return map.get(key);\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   // Generate private setters for the builder to proxy into.
@@ -484,42 +527,49 @@ GenerateMembers(io::Printer* printer) const {
   }
 }
 
+
 void ImmutableMapFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   printer->Print(
       variables_,
+      "@java.lang.Override\n"
       "$deprecation$\n"
-      "public int get$capitalized_name$Count() {\n"
+      "public int ${$get$capitalized_name$Count$}$() {\n"
       "  return instance.get$capitalized_name$Map().size();\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
+      "@java.lang.Override\n"
       "$deprecation$\n"
-      "public boolean contains$capitalized_name$(\n"
+      "public boolean ${$contains$capitalized_name$$}$(\n"
       "    $key_type$ key) {\n"
       "  $key_null_check$\n"
       "  return instance.get$capitalized_name$Map().containsKey(key);\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(
       variables_,
       "$deprecation$\n"
-      "public Builder clear$capitalized_name$() {\n"
+      "public Builder ${$clear$capitalized_name$$}$() {\n"
       "  copyOnWrite();\n"
       "  instance.getMutable$capitalized_name$Map().clear();\n"
       "  return this;\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(
       variables_,
       "$deprecation$\n"
-      "public Builder remove$capitalized_name$(\n"
+      "public Builder ${$remove$capitalized_name$$}$(\n"
       "    $key_type$ key) {\n"
       "  $key_null_check$\n"
       "  copyOnWrite();\n"
       "  instance.getMutable$capitalized_name$Map().remove(key);\n"
       "  return this;\n"
       "}\n");
+  printer->Annotate("{", "}", descriptor_);
   if (GetJavaType(ValueField(descriptor_)) == JAVATYPE_ENUM) {
     printer->Print(
         variables_,
@@ -528,23 +578,27 @@ GenerateBuilderMembers(io::Printer* printer) const {
         " */\n"
         "@java.lang.Deprecated\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$() {\n"
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
         "public java.util.Map<$boxed_key_type$, $value_enum_type$>\n"
-        "get$capitalized_name$Map() {\n"
+        "${$get$capitalized_name$Map$}$() {\n"
         "  return java.util.Collections.unmodifiableMap(\n"
         "      instance.get$capitalized_name$Map());\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -554,11 +608,13 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "         ? map.get(key)\n"
         "         : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_enum_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_enum_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$boxed_key_type$, $value_enum_type$> map =\n"
@@ -568,10 +624,11 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "  }\n"
         "  return map.get(key);\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$public Builder put$capitalized_name$(\n"
+        "$deprecation$public Builder ${$put$capitalized_name$$}$(\n"
         "    $key_type$ key,\n"
         "    $value_enum_type$ value) {\n"
         "  $key_null_check$\n"
@@ -580,40 +637,47 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "  instance.getMutable$capitalized_name$Map().put(key, value);\n"
         "  return this;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
-        "$deprecation$public Builder putAll$capitalized_name$(\n"
+        "$deprecation$public Builder ${$putAll$capitalized_name$$}$(\n"
         "    java.util.Map<$boxed_key_type$, $value_enum_type$> values) {\n"
         "  copyOnWrite();\n"
         "  instance.getMutable$capitalized_name$Map().putAll(values);\n"
         "  return this;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     if (SupportUnknownEnumValue(descriptor_->file())) {
       printer->Print(
           variables_,
           "/**\n"
           " * Use {@link #get$capitalized_name$ValueMap()} instead.\n"
           " */\n"
+          "@java.lang.Override\n"
           "@java.lang.Deprecated\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$Value() {\n"
+          "${$get$capitalized_name$Value$}$() {\n"
           "  return get$capitalized_name$ValueMap();\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
           "public java.util.Map<$boxed_key_type$, $boxed_value_type$>\n"
-          "get$capitalized_name$ValueMap() {\n"
+          "${$get$capitalized_name$ValueMap$}$() {\n"
           "  return java.util.Collections.unmodifiableMap(\n"
           "      instance.get$capitalized_name$ValueMap());\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrDefault(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrDefault$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ defaultValue) {\n"
           "  $key_null_check$\n"
@@ -621,11 +685,13 @@ GenerateBuilderMembers(io::Printer* printer) const {
           "      instance.get$capitalized_name$ValueMap();\n"
           "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
+          "@java.lang.Override\n"
           "$deprecation$\n"
-          "public $value_type$ get$capitalized_name$ValueOrThrow(\n"
+          "public $value_type$ ${$get$capitalized_name$ValueOrThrow$}$(\n"
           "    $key_type$ key) {\n"
           "  $key_null_check$\n"
           "  java.util.Map<$boxed_key_type$, $boxed_value_type$> map =\n"
@@ -635,29 +701,29 @@ GenerateBuilderMembers(io::Printer* printer) const {
           "  }\n"
           "  return map.get(key);\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
-          "$deprecation$public Builder put$capitalized_name$Value(\n"
+          "$deprecation$public Builder ${$put$capitalized_name$Value$}$(\n"
           "    $key_type$ key,\n"
           "    $value_type$ value) {\n"
           "  $key_null_check$\n"
-          "  if ($value_enum_type$.forNumber(value) == null) {\n"
-          "    throw new java.lang.IllegalArgumentException();\n"
-          "  }\n"
           "  copyOnWrite();\n"
           "  instance.getMutable$capitalized_name$ValueMap().put(key, value);\n"
           "  return this;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
       WriteFieldDocComment(printer, descriptor_);
       printer->Print(
           variables_,
-          "$deprecation$public Builder putAll$capitalized_name$Value(\n"
+          "$deprecation$public Builder ${$putAll$capitalized_name$Value$}$(\n"
           "    java.util.Map<$boxed_key_type$, $boxed_value_type$> values) {\n"
           "  copyOnWrite();\n"
           "  instance.getMutable$capitalized_name$ValueMap().putAll(values);\n"
           "  return this;\n"
           "}\n");
+      printer->Annotate("{", "}", descriptor_);
     }
   } else {
     printer->Print(
@@ -665,23 +731,30 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "/**\n"
         " * Use {@link #get$capitalized_name$Map()} instead.\n"
         " */\n"
+        "@java.lang.Override\n"
         "@java.lang.Deprecated\n"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$$}$() {\n"
         "  return get$capitalized_name$Map();\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$"
-        "public java.util.Map<$type_parameters$> get$capitalized_name$Map() {\n"
+        "public java.util.Map<$type_parameters$> "
+        "${$get$capitalized_name$Map$}$() {\n"
         "  return java.util.Collections.unmodifiableMap(\n"
         "      instance.get$capitalized_name$Map());\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrDefault(\n"
+        "public $value_type$ ${$get$capitalized_name$OrDefault$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ defaultValue) {\n"
         "  $key_null_check$\n"
@@ -689,11 +762,13 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "      instance.get$capitalized_name$Map();\n"
         "  return map.containsKey(key) ? map.get(key) : defaultValue;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
+        "@java.lang.Override\n"
         "$deprecation$\n"
-        "public $value_type$ get$capitalized_name$OrThrow(\n"
+        "public $value_type$ ${$get$capitalized_name$OrThrow$}$(\n"
         "    $key_type$ key) {\n"
         "  $key_null_check$\n"
         "  java.util.Map<$type_parameters$> map =\n"
@@ -703,11 +778,12 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "  }\n"
         "  return map.get(key);\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$"
-        "public Builder put$capitalized_name$(\n"
+        "public Builder ${$put$capitalized_name$$}$(\n"
         "    $key_type$ key,\n"
         "    $value_type$ value) {\n"
         "  $key_null_check$\n"
@@ -716,16 +792,18 @@ GenerateBuilderMembers(io::Printer* printer) const {
         "  instance.getMutable$capitalized_name$Map().put(key, value);\n"
         "  return this;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(
         variables_,
         "$deprecation$"
-        "public Builder putAll$capitalized_name$(\n"
+        "public Builder ${$putAll$capitalized_name$$}$(\n"
         "    java.util.Map<$type_parameters$> values) {\n"
         "  copyOnWrite();\n"
         "  instance.getMutable$capitalized_name$Map().putAll(values);\n"
         "  return this;\n"
         "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
diff --git a/src/google/protobuf/compiler/java/java_map_field_lite.h b/src/google/protobuf/compiler/java/java_map_field_lite.h
index 63dedbc2..94aa4813 100644
--- a/src/google/protobuf/compiler/java/java_map_field_lite.h
+++ b/src/google/protobuf/compiler/java/java_map_field_lite.h
@@ -62,6 +62,7 @@ class ImmutableMapFieldLiteGenerator : public ImmutableFieldLiteGenerator {
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  private:
diff --git a/src/google/protobuf/compiler/java/java_message.cc b/src/google/protobuf/compiler/java/java_message.cc
index df4db463..209c0b2a 100644
--- a/src/google/protobuf/compiler/java/java_message.cc
+++ b/src/google/protobuf/compiler/java/java_message.cc
@@ -38,9 +38,6 @@
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/compiler/java/java_context.h>
@@ -52,12 +49,13 @@
 #include <google/protobuf/compiler/java/java_message_builder.h>
 #include <google/protobuf/compiler/java/java_message_builder_lite.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
+#include <google/protobuf/stubs/strutil.h>
+
 
 namespace google {
 namespace protobuf {
@@ -253,23 +251,27 @@ void ImmutableMessageGenerator::GenerateInterface(io::Printer* printer) {
                                 /* immutable = */ true, "OrBuilder");
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
-        "public interface $classname$OrBuilder$idend$ extends\n"
+        "$deprecation$public interface ${$$classname$OrBuilder$}$ extends\n"
         "    $extra_interfaces$\n"
         "    com.google.protobuf.GeneratedMessage$ver$.\n"
         "        ExtendableMessageOrBuilder<$classname$> {\n",
+        "deprecation", descriptor_->options().deprecated() ?
+            "@java.lang.Deprecated " : "",
         "extra_interfaces", ExtraMessageOrBuilderInterfaces(descriptor_),
         "classname", descriptor_->name(),
-        "idend", "", "ver", GeneratedCodeVersionSuffix());
+        "{", "", "}", "", "ver", GeneratedCodeVersionSuffix());
   } else {
     printer->Print(
-        "public interface $classname$OrBuilder$idend$ extends\n"
+        "$deprecation$public interface ${$$classname$OrBuilder$}$ extends\n"
         "    $extra_interfaces$\n"
         "    com.google.protobuf.MessageOrBuilder {\n",
+        "deprecation", descriptor_->options().deprecated() ?
+            "@java.lang.Deprecated " : "",
         "extra_interfaces", ExtraMessageOrBuilderInterfaces(descriptor_),
         "classname", descriptor_->name(),
-        "idend", "");
+        "{", "", "}", "");
   }
-  printer->Annotate("classname", "idend", descriptor_);
+  printer->Annotate("{", "}", descriptor_);
 
   printer->Indent();
     for (int i = 0; i < descriptor_->field_count(); i++) {
@@ -304,6 +306,8 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
   variables["classname"] = descriptor_->name();
   variables["extra_interfaces"] = ExtraMessageInterfaces(descriptor_);
   variables["ver"] = GeneratedCodeVersionSuffix();
+  variables["deprecation"] = descriptor_->options().deprecated()
+      ? "@java.lang.Deprecated " : "";
 
   WriteMessageDocComment(printer, descriptor_);
   MaybePrintGeneratedAnnotation(context_, printer, descriptor_,
@@ -312,8 +316,9 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
   // The builder_type stores the super type name of the nested Builder class.
   string builder_type;
   if (descriptor_->extension_range_count() > 0) {
-    printer->Print(variables,
-                   "public $static$final class $classname$ extends\n");
+    printer->Print(
+        variables,
+        "$deprecation$public $static$final class $classname$ extends\n");
     printer->Annotate("classname", descriptor_);
     printer->Print(
         variables,
@@ -326,8 +331,9 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
         name_resolver_->GetImmutableClassName(descriptor_),
         GeneratedCodeVersionSuffix());
   } else {
-    printer->Print(variables,
-                   "public $static$final class $classname$ extends\n");
+    printer->Print(
+        variables,
+        "$deprecation$public $static$final class $classname$ extends\n");
     printer->Annotate("classname", descriptor_);
     printer->Print(variables,
       "    com.google.protobuf.GeneratedMessage$ver$ implements\n"
@@ -337,6 +343,9 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
         "com.google.protobuf.GeneratedMessage$0.Builder<?>",
         GeneratedCodeVersionSuffix());
   }
+  printer->Print(
+    "private static final long serialVersionUID = 0L;\n");
+
   printer->Indent();
   // Using builder_type, instead of Builder, prevents the Builder class from
   // being loaded into PermGen space when the default instance is created.
@@ -359,22 +368,19 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
     "}\n"
     "\n");
 
+
   printer->Print(
     "@java.lang.Override\n"
     "public final com.google.protobuf.UnknownFieldSet\n"
-    "getUnknownFields() {\n");
-  if (PreserveUnknownFields(descriptor_)) {
-    printer->Print(
-      "  return this.unknownFields;\n");
-  } else {
-    printer->Print(
-      "  return com.google.protobuf.UnknownFieldSet.getDefaultInstance();\n");
-  }
-  printer->Print(
+    "getUnknownFields() {\n"
+    "  return this.unknownFields;\n"
     "}\n");
 
   if (context_->HasGeneratedMethods(descriptor_)) {
-    GenerateParsingConstructor(printer);
+    if (!EnableExperimentalRuntime(context_) ||
+        IsDescriptorProto(descriptor_)) {
+      GenerateParsingConstructor(printer);
+    }
   }
 
   GenerateDescriptorMethods(printer);
@@ -428,11 +434,11 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
     for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
       const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
       printer->Print(
-        "$field_name$($field_number$),\n",
-        "field_name",
-        ToUpper(field->name()),
-        "field_number",
-        SimpleItoa(field->number()));
+        "$deprecation$$field_name$($field_number$),\n",
+        "deprecation",
+        field->options().deprecated() ? "@java.lang.Deprecated " : "",
+        "field_name", ToUpper(field->name()),
+        "field_number", SimpleItoa(field->number()));
     }
     printer->Print(
       "$cap_oneof_name$_NOT_SET(0);\n",
@@ -532,9 +538,21 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
       "\n",
       "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
+  // 'of' method for Wrappers
+  if (IsWrappersProtoFile(descriptor_->file())) {
+    printer->Print(
+        "public static $classname$ of($field_type$ value) {\n"
+        "  return newBuilder().setValue(value).build();\n"
+        "}\n"
+        "\n",
+        "classname", name_resolver_->GetImmutableClassName(descriptor_),
+        "field_type", PrimitiveTypeName(GetJavaType(descriptor_->field(0))));
+  }
+
   GenerateParser(printer);
 
   printer->Print(
+    "@java.lang.Override\n"
     "public $classname$ getDefaultInstanceForType() {\n"
     "  return DEFAULT_INSTANCE;\n"
     "}\n"
@@ -558,7 +576,7 @@ void ImmutableMessageGenerator::Generate(io::Printer* printer) {
 
 void ImmutableMessageGenerator::
 GenerateMessageSerializationMethods(io::Printer* printer) {
-  google::protobuf::scoped_array<const FieldDescriptor * > sorted_fields(
+  std::unique_ptr<const FieldDescriptor * []> sorted_fields(
       SortFieldsByNumber(descriptor_));
 
   std::vector<const Descriptor::ExtensionRange*> sorted_extensions;
@@ -568,107 +586,110 @@ GenerateMessageSerializationMethods(io::Printer* printer) {
   std::sort(sorted_extensions.begin(), sorted_extensions.end(),
             ExtensionRangeOrdering());
   printer->Print(
+    "@java.lang.Override\n"
     "public void writeTo(com.google.protobuf.CodedOutputStream output)\n"
     "                    throws java.io.IOException {\n");
   printer->Indent();
-  if (HasPackedFields(descriptor_)) {
-    // writeTo(CodedOutputStream output) might be invoked without
-    // getSerializedSize() ever being called, but we need the memoized
-    // sizes in case this message has packed fields. Rather than emit checks for
-    // each packed field, just call getSerializedSize() up front.
-    // In most cases, getSerializedSize() will have already been called anyway
-    // by one of the wrapper writeTo() methods, making this call cheap.
-    printer->Print(
-      "getSerializedSize();\n");
-  }
 
-  if (descriptor_->extension_range_count() > 0) {
-    if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "com.google.protobuf.GeneratedMessage$ver$\n"
-        "  .ExtendableMessage<$classname$>.ExtensionWriter\n"
-        "    extensionWriter = newMessageSetExtensionWriter();\n",
-        "classname", name_resolver_->GetImmutableClassName(descriptor_),
-        "ver", GeneratedCodeVersionSuffix());
-    } else {
-      printer->Print(
-        "com.google.protobuf.GeneratedMessage$ver$\n"
-        "  .ExtendableMessage<$classname$>.ExtensionWriter\n"
-        "    extensionWriter = newExtensionWriter();\n",
-        "classname", name_resolver_->GetImmutableClassName(descriptor_),
-        "ver", GeneratedCodeVersionSuffix());
+  if (EnableExperimentalRuntime(context_) && !IsDescriptorProto(descriptor_)) {
+    printer->Print("writeToInternal(output);\n");
+  } else {
+    if (HasPackedFields(descriptor_)) {
+      // writeTo(CodedOutputStream output) might be invoked without
+      // getSerializedSize() ever being called, but we need the memoized
+      // sizes in case this message has packed fields. Rather than emit checks
+      // for each packed field, just call getSerializedSize() up front. In most
+      // cases, getSerializedSize() will have already been called anyway by one
+      // of the wrapper writeTo() methods, making this call cheap.
+      printer->Print("getSerializedSize();\n");
     }
-  }
 
-  // Merge the fields and the extension ranges, both sorted by field number.
-  for (int i = 0, j = 0;
-       i < descriptor_->field_count() || j < sorted_extensions.size();
-       ) {
-    if (i == descriptor_->field_count()) {
-      GenerateSerializeOneExtensionRange(printer, sorted_extensions[j++]);
-    } else if (j == sorted_extensions.size()) {
-      GenerateSerializeOneField(printer, sorted_fields[i++]);
-    } else if (sorted_fields[i]->number() < sorted_extensions[j]->start) {
-      GenerateSerializeOneField(printer, sorted_fields[i++]);
-    } else {
-      GenerateSerializeOneExtensionRange(printer, sorted_extensions[j++]);
+    if (descriptor_->extension_range_count() > 0) {
+      if (descriptor_->options().message_set_wire_format()) {
+        printer->Print(
+            "com.google.protobuf.GeneratedMessage$ver$\n"
+            "  .ExtendableMessage<$classname$>.ExtensionWriter\n"
+            "    extensionWriter = newMessageSetExtensionWriter();\n",
+            "classname", name_resolver_->GetImmutableClassName(descriptor_),
+            "ver", GeneratedCodeVersionSuffix());
+      } else {
+        printer->Print(
+            "com.google.protobuf.GeneratedMessage$ver$\n"
+            "  .ExtendableMessage<$classname$>.ExtensionWriter\n"
+            "    extensionWriter = newExtensionWriter();\n",
+            "classname", name_resolver_->GetImmutableClassName(descriptor_),
+            "ver", GeneratedCodeVersionSuffix());
+      }
+    }
+
+    // Merge the fields and the extension ranges, both sorted by field number.
+    for (int i = 0, j = 0;
+         i < descriptor_->field_count() || j < sorted_extensions.size();) {
+      if (i == descriptor_->field_count()) {
+        GenerateSerializeOneExtensionRange(printer, sorted_extensions[j++]);
+      } else if (j == sorted_extensions.size()) {
+        GenerateSerializeOneField(printer, sorted_fields[i++]);
+      } else if (sorted_fields[i]->number() < sorted_extensions[j]->start) {
+        GenerateSerializeOneField(printer, sorted_fields[i++]);
+      } else {
+        GenerateSerializeOneExtensionRange(printer, sorted_extensions[j++]);
+      }
     }
-  }
 
-  if (PreserveUnknownFields(descriptor_)) {
     if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "unknownFields.writeAsMessageSetTo(output);\n");
+      printer->Print("unknownFields.writeAsMessageSetTo(output);\n");
     } else {
-      printer->Print(
-        "unknownFields.writeTo(output);\n");
+      printer->Print("unknownFields.writeTo(output);\n");
     }
   }
 
   printer->Outdent();
   printer->Print(
-    "}\n"
-    "\n"
-    "public int getSerializedSize() {\n"
-    "  int size = memoizedSize;\n"
-    "  if (size != -1) return size;\n"
-    "\n"
-    "  size = 0;\n");
+      "}\n"
+      "\n"
+      "@java.lang.Override\n"
+      "public int getSerializedSize() {\n"
+      "  int size = memoizedSize;\n"
+      "  if (size != -1) return size;\n"
+      "\n");
   printer->Indent();
+  if (EnableExperimentalRuntime(context_) && !IsDescriptorProto(descriptor_)) {
+    printer->Print(
+        "memoizedSize = getSerializedSizeInternal();\n"
+        "return memoizedSize;\n");
+  } else {
 
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    field_generators_.get(sorted_fields[i]).GenerateSerializedSizeCode(printer);
-  }
+    printer->Print("size = 0;\n");
 
-  if (descriptor_->extension_range_count() > 0) {
-    if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "size += extensionsSerializedSizeAsMessageSet();\n");
-    } else {
-      printer->Print(
-        "size += extensionsSerializedSize();\n");
+    for (int i = 0; i < descriptor_->field_count(); i++) {
+      field_generators_.get(sorted_fields[i])
+          .GenerateSerializedSizeCode(printer);
+    }
+
+    if (descriptor_->extension_range_count() > 0) {
+      if (descriptor_->options().message_set_wire_format()) {
+        printer->Print("size += extensionsSerializedSizeAsMessageSet();\n");
+      } else {
+        printer->Print("size += extensionsSerializedSize();\n");
+      }
     }
-  }
 
-  if (PreserveUnknownFields(descriptor_)) {
     if (descriptor_->options().message_set_wire_format()) {
       printer->Print(
-        "size += unknownFields.getSerializedSizeAsMessageSet();\n");
+          "size += unknownFields.getSerializedSizeAsMessageSet();\n");
     } else {
-      printer->Print(
-        "size += unknownFields.getSerializedSize();\n");
+      printer->Print("size += unknownFields.getSerializedSize();\n");
     }
+
+    printer->Print(
+        "memoizedSize = size;\n"
+        "return size;\n");
   }
 
   printer->Outdent();
   printer->Print(
-    "  memoizedSize = size;\n"
-    "  return size;\n"
     "}\n"
     "\n");
-
-  printer->Print(
-    "private static final long serialVersionUID = 0L;\n");
 }
 
 void ImmutableMessageGenerator::
@@ -678,6 +699,17 @@ GenerateParseFromMethods(io::Printer* printer) {
   //   for code size.
   printer->Print(
     "public static $classname$ parseFrom(\n"
+    "    java.nio.ByteBuffer data)\n"
+    "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
+    "  return PARSER.parseFrom(data);\n"
+    "}\n"
+    "public static $classname$ parseFrom(\n"
+    "    java.nio.ByteBuffer data,\n"
+    "    com.google.protobuf.ExtensionRegistryLite extensionRegistry)\n"
+    "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
+    "  return PARSER.parseFrom(data, extensionRegistry);\n"
+    "}\n"
+    "public static $classname$ parseFrom(\n"
     "    com.google.protobuf.ByteString data)\n"
     "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
     "  return PARSER.parseFrom(data);\n"
@@ -757,6 +789,7 @@ void ImmutableMessageGenerator::GenerateSerializeOneExtensionRange(
 void ImmutableMessageGenerator::GenerateBuilder(io::Printer* printer) {
   // LITE_RUNTIME implements this at the GeneratedMessageLite level.
   printer->Print(
+    "@java.lang.Override\n"
     "public Builder newBuilderForType() { return newBuilder(); }\n");
 
   printer->Print(
@@ -766,6 +799,7 @@ void ImmutableMessageGenerator::GenerateBuilder(io::Printer* printer) {
     "public static Builder newBuilder($classname$ prototype) {\n"
     "  return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder toBuilder() {\n"
     "  return this == DEFAULT_INSTANCE\n"
     "      ? new Builder() : new Builder().mergeFrom(this);\n"
@@ -809,6 +843,7 @@ GenerateDescriptorMethods(io::Printer* printer) {
   if (!map_fields.empty()) {
     printer->Print(
       "@SuppressWarnings({\"rawtypes\"})\n"
+      "@java.lang.Override\n"
       "protected com.google.protobuf.MapField internalGetMapField(\n"
       "    int number) {\n"
       "  switch (number) {\n");
@@ -834,6 +869,7 @@ GenerateDescriptorMethods(io::Printer* printer) {
         "}\n");
   }
   printer->Print(
+    "@java.lang.Override\n"
     "protected com.google.protobuf.GeneratedMessage$ver$.FieldAccessorTable\n"
     "    internalGetFieldAccessorTable() {\n"
     "  return $fileclass$.internal_$identifier$_fieldAccessorTable\n"
@@ -857,6 +893,7 @@ void ImmutableMessageGenerator::GenerateIsInitialized(
   printer->Print(
     "private byte memoizedIsInitialized = -1;\n");
   printer->Print(
+    "@java.lang.Override\n"
     "public final boolean isInitialized() {\n");
   printer->Indent();
 
@@ -1059,13 +1096,11 @@ GenerateEqualsAndHashCode(io::Printer* printer) {
     printer->Print("}\n");
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    // Always consider unknown fields for equality. This will sometimes return
-    // false for non-canonical ordering when running in LITE_RUNTIME but it's
-    // the best we can do.
-    printer->Print(
+  // Always consider unknown fields for equality. This will sometimes return
+  // false for non-canonical ordering when running in LITE_RUNTIME but it's
+  // the best we can do.
+  printer->Print(
       "result = result && unknownFields.equals(other.unknownFields);\n");
-  }
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
       "result = result &&\n"
@@ -1179,7 +1214,7 @@ GenerateExtensionRegistrationCode(io::Printer* printer) {
 // ===================================================================
 void ImmutableMessageGenerator::
 GenerateParsingConstructor(io::Printer* printer) {
-  google::protobuf::scoped_array<const FieldDescriptor * > sorted_fields(
+  std::unique_ptr<const FieldDescriptor * []> sorted_fields(
       SortFieldsByNumber(descriptor_));
 
   printer->Print(
@@ -1192,7 +1227,10 @@ GenerateParsingConstructor(io::Printer* printer) {
 
   // Initialize all fields to default.
   printer->Print(
-      "this();\n");
+      "this();\n"
+      "if (extensionRegistry == null) {\n"
+      "  throw new java.lang.NullPointerException();\n"
+      "}\n");
 
   // Use builder bits to track mutable repeated fields.
   int totalBuilderBits = 0;
@@ -1207,11 +1245,9 @@ GenerateParsingConstructor(io::Printer* printer) {
       "bit_field_name", GetBitFieldName(i));
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    printer->Print(
+  printer->Print(
       "com.google.protobuf.UnknownFieldSet.Builder unknownFields =\n"
       "    com.google.protobuf.UnknownFieldSet.newBuilder();\n");
-  }
 
   printer->Print(
       "try {\n");
@@ -1228,28 +1264,9 @@ GenerateParsingConstructor(io::Printer* printer) {
   printer->Indent();
 
   printer->Print(
-    "case 0:\n"          // zero signals EOF / limit reached
-    "  done = true;\n"
-    "  break;\n");
-
-  if (PreserveUnknownFields(descriptor_)) {
-    printer->Print(
-      "default: {\n"
-      "  if (!parseUnknownField(input, unknownFields,\n"
-      "                         extensionRegistry, tag)) {\n"
-      "    done = true;\n"  // it's an endgroup tag
-      "  }\n"
-      "  break;\n"
-      "}\n");
-  } else {
-    printer->Print(
-      "default: {\n"
-      "  if (!input.skipField(tag)) {\n"
-      "    done = true;\n"  // it's an endgroup tag
-      "  }\n"
-      "  break;\n"
-      "}\n");
-  }
+      "case 0:\n"  // zero signals EOF / limit reached
+      "  done = true;\n"
+      "  break;\n");
 
   for (int i = 0; i < descriptor_->field_count(); i++) {
     const FieldDescriptor* field = sorted_fields[i];
@@ -1287,6 +1304,18 @@ GenerateParsingConstructor(io::Printer* printer) {
     }
   }
 
+  printer->Print(
+      "default: {\n"
+      "  if (!parseUnknownField$suffix$(\n"
+      "      input, unknownFields, extensionRegistry, tag)) {\n"
+      "    done = true;\n"  // it's an endgroup tag
+      "  }\n"
+      "  break;\n"
+      "}\n",
+      "suffix",
+      descriptor_->file()->syntax() == FileDescriptor::SYNTAX_PROTO3 ? "Proto3"
+                                                                     : "");
+
   printer->Outdent();
   printer->Outdent();
   printer->Print(
@@ -1309,10 +1338,8 @@ GenerateParsingConstructor(io::Printer* printer) {
     field_generators_.get(field).GenerateParsingDoneCode(printer);
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    // Make unknown fields immutable.
-    printer->Print("this.unknownFields = unknownFields.build();\n");
-  }
+  // Make unknown fields immutable.
+  printer->Print("this.unknownFields = unknownFields.build();\n");
 
   // Make extensions immutable.
   printer->Print(
@@ -1336,15 +1363,24 @@ void ImmutableMessageGenerator::GenerateParser(io::Printer* printer) {
       "classname", descriptor_->name());
   printer->Indent();
   printer->Print(
+      "@java.lang.Override\n"
       "public $classname$ parsePartialFrom(\n"
       "    com.google.protobuf.CodedInputStream input,\n"
       "    com.google.protobuf.ExtensionRegistryLite extensionRegistry)\n"
       "    throws com.google.protobuf.InvalidProtocolBufferException {\n",
       "classname", descriptor_->name());
-  if (context_->HasGeneratedMethods(descriptor_)) {
+  if (EnableExperimentalRuntime(context_) && !IsDescriptorProto(descriptor_)) {
+    printer->Indent();
     printer->Print(
-        "    return new $classname$(input, extensionRegistry);\n",
+        "$classname$ msg = new $classname$();\n"
+        "msg.mergeFromInternal(input, extensionRegistry);\n"
+        "msg.makeImmutableInternal();\n"
+        "return msg;\n",
         "classname", descriptor_->name());
+    printer->Outdent();
+  } else if (context_->HasGeneratedMethods(descriptor_)) {
+    printer->Print("  return new $classname$(input, extensionRegistry);\n",
+                   "classname", descriptor_->name());
   } else {
     // When parsing constructor isn't generated, use builder to parse
     // messages. Note, will fallback to use reflection based mergeFieldFrom()
@@ -1445,6 +1481,7 @@ void ImmutableMessageGenerator::GenerateAnyMethods(io::Printer* printer) {
     "\n"
     "private volatile com.google.protobuf.Message cachedUnpackValue;\n"
     "\n"
+    "@java.lang.SuppressWarnings(\"unchecked\")\n"
     "public <T extends com.google.protobuf.Message> T unpack(\n"
     "    java.lang.Class<T> clazz)\n"
     "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
diff --git a/src/google/protobuf/compiler/java/java_message_builder.cc b/src/google/protobuf/compiler/java/java_message_builder.cc
index f5643abc..4c67e806 100644
--- a/src/google/protobuf/compiler/java/java_message_builder.cc
+++ b/src/google/protobuf/compiler/java/java_message_builder.cc
@@ -38,9 +38,6 @@
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/compiler/java/java_context.h>
@@ -50,12 +47,13 @@
 #include <google/protobuf/compiler/java/java_generator_factory.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
+#include <google/protobuf/stubs/strutil.h>
+
 
 namespace google {
 namespace protobuf {
@@ -171,36 +169,27 @@ Generate(io::Printer* printer) {
                      .GenerateBuilderMembers(printer);
   }
 
-  if (!PreserveUnknownFields(descriptor_)) {
-    printer->Print(
-      "public final Builder setUnknownFields(\n"
-      "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
-      "  return this;\n"
-      "}\n"
-      "\n"
-      "public final Builder mergeUnknownFields(\n"
-      "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
-      "  return this;\n"
-      "}\n"
-      "\n");
-  } else {
+  bool is_proto3 =
+      descriptor_->file()->syntax() == FileDescriptor::SYNTAX_PROTO3;
     // Override methods declared in GeneratedMessage to return the concrete
     // generated type so callsites won't depend on GeneratedMessage. This
     // is needed to keep binary compatibility when we change generated code
     // to subclass a different GeneratedMessage class (e.g., in v3.0.0 release
     // we changed all generated code to subclass GeneratedMessageV3).
-    printer->Print(
-      "public final Builder setUnknownFields(\n"
-      "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
-      "  return super.setUnknownFields(unknownFields);\n"
-      "}\n"
-      "\n"
-      "public final Builder mergeUnknownFields(\n"
-      "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
-      "  return super.mergeUnknownFields(unknownFields);\n"
-      "}\n"
-      "\n");
-  }
+  printer->Print(
+    "@java.lang.Override\n"
+    "public final Builder setUnknownFields(\n"
+    "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
+    "  return super.setUnknownFields$suffix$(unknownFields);\n"
+    "}\n"
+    "\n"
+    "@java.lang.Override\n"
+    "public final Builder mergeUnknownFields(\n"
+    "    final com.google.protobuf.UnknownFieldSet unknownFields) {\n"
+    "  return super.mergeUnknownFields(unknownFields);\n"
+    "}\n"
+    "\n",
+    "suffix", is_proto3 ? "Proto3" : "");
 
   printer->Print(
     "\n"
@@ -287,6 +276,7 @@ GenerateDescriptorMethods(io::Printer* printer) {
         "}\n");
   }
   printer->Print(
+    "@java.lang.Override\n"
     "protected com.google.protobuf.GeneratedMessage$ver$.FieldAccessorTable\n"
     "    internalGetFieldAccessorTable() {\n"
     "  return $fileclass$.internal_$identifier$_fieldAccessorTable\n"
@@ -343,6 +333,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
     "}\n");
 
   printer->Print(
+    "@java.lang.Override\n"
     "public Builder clear() {\n"
     "  super.clear();\n");
 
@@ -371,6 +362,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
     "\n");
 
   printer->Print(
+    "@java.lang.Override\n"
     "public com.google.protobuf.Descriptors.Descriptor\n"
     "    getDescriptorForType() {\n"
     "  return $fileclass$.internal_$identifier$_descriptor;\n"
@@ -381,6 +373,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
 
   // LITE runtime implements this in GeneratedMessageLite.
   printer->Print(
+    "@java.lang.Override\n"
     "public $classname$ getDefaultInstanceForType() {\n"
     "  return $classname$.getDefaultInstance();\n"
     "}\n"
@@ -388,6 +381,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
     "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
   printer->Print(
+    "@java.lang.Override\n"
     "public $classname$ build() {\n"
     "  $classname$ result = buildPartial();\n"
     "  if (!result.isInitialized()) {\n"
@@ -399,6 +393,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
     "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
   printer->Print(
+    "@java.lang.Override\n"
     "public $classname$ buildPartial() {\n"
     "  $classname$ result = new $classname$(this);\n",
     "classname", name_resolver_->GetImmutableClassName(descriptor_));
@@ -467,53 +462,63 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
   // to subclass a different GeneratedMessage class (e.g., in v3.0.0 release
   // we changed all generated code to subclass GeneratedMessageV3).
   printer->Print(
+    "@java.lang.Override\n"
     "public Builder clone() {\n"
     "  return (Builder) super.clone();\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder setField(\n"
     "    com.google.protobuf.Descriptors.FieldDescriptor field,\n"
-    "    Object value) {\n"
+    "    java.lang.Object value) {\n"
     "  return (Builder) super.setField(field, value);\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder clearField(\n"
     "    com.google.protobuf.Descriptors.FieldDescriptor field) {\n"
     "  return (Builder) super.clearField(field);\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder clearOneof(\n"
     "    com.google.protobuf.Descriptors.OneofDescriptor oneof) {\n"
     "  return (Builder) super.clearOneof(oneof);\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder setRepeatedField(\n"
     "    com.google.protobuf.Descriptors.FieldDescriptor field,\n"
-    "    int index, Object value) {\n"
+    "    int index, java.lang.Object value) {\n"
     "  return (Builder) super.setRepeatedField(field, index, value);\n"
     "}\n"
+    "@java.lang.Override\n"
     "public Builder addRepeatedField(\n"
     "    com.google.protobuf.Descriptors.FieldDescriptor field,\n"
-    "    Object value) {\n"
+    "    java.lang.Object value) {\n"
     "  return (Builder) super.addRepeatedField(field, value);\n"
     "}\n");
 
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
+      "@java.lang.Override\n"
       "public <Type> Builder setExtension(\n"
       "    com.google.protobuf.GeneratedMessage.GeneratedExtension<\n"
       "        $classname$, Type> extension,\n"
       "    Type value) {\n"
       "  return (Builder) super.setExtension(extension, value);\n"
       "}\n"
+      "@java.lang.Override\n"
       "public <Type> Builder setExtension(\n"
       "    com.google.protobuf.GeneratedMessage.GeneratedExtension<\n"
       "        $classname$, java.util.List<Type>> extension,\n"
       "    int index, Type value) {\n"
       "  return (Builder) super.setExtension(extension, index, value);\n"
       "}\n"
+      "@java.lang.Override\n"
       "public <Type> Builder addExtension(\n"
       "    com.google.protobuf.GeneratedMessage.GeneratedExtension<\n"
       "        $classname$, java.util.List<Type>> extension,\n"
       "    Type value) {\n"
       "  return (Builder) super.addExtension(extension, value);\n"
       "}\n"
+      "@java.lang.Override\n"
       "public <Type> Builder clearExtension(\n"
       "    com.google.protobuf.GeneratedMessage.GeneratedExtension<\n"
       "        $classname$, ?> extension) {\n"
@@ -526,6 +531,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
 
   if (context_->HasGeneratedMethods(descriptor_)) {
     printer->Print(
+      "@java.lang.Override\n"
       "public Builder mergeFrom(com.google.protobuf.Message other) {\n"
       "  if (other instanceof $classname$) {\n"
       "    return mergeFrom(($classname$)other);\n"
@@ -594,10 +600,8 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
         "  this.mergeExtensionFields(other);\n");
     }
 
-    if (PreserveUnknownFields(descriptor_)) {
-      printer->Print(
-        "  this.mergeUnknownFields(other.unknownFields);\n");
-    }
+    printer->Print(
+      "  this.mergeUnknownFields(other.unknownFields);\n");
 
     printer->Print(
       "  onChanged();\n");
@@ -614,6 +618,7 @@ GenerateCommonBuilderMethods(io::Printer* printer) {
 void MessageBuilderGenerator::
 GenerateBuilderParsingMethods(io::Printer* printer) {
   printer->Print(
+    "@java.lang.Override\n"
     "public Builder mergeFrom(\n"
     "    com.google.protobuf.CodedInputStream input,\n"
     "    com.google.protobuf.ExtensionRegistryLite extensionRegistry)\n"
@@ -639,6 +644,7 @@ GenerateBuilderParsingMethods(io::Printer* printer) {
 void MessageBuilderGenerator::GenerateIsInitialized(
     io::Printer* printer) {
   printer->Print(
+    "@java.lang.Override\n"
     "public final boolean isInitialized() {\n");
   printer->Indent();
 
diff --git a/src/google/protobuf/compiler/java/java_message_builder_lite.cc b/src/google/protobuf/compiler/java/java_message_builder_lite.cc
index 7e404ba1..f04d394e 100644
--- a/src/google/protobuf/compiler/java/java_message_builder_lite.cc
+++ b/src/google/protobuf/compiler/java/java_message_builder_lite.cc
@@ -38,9 +38,6 @@
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/compiler/java/java_context.h>
@@ -50,12 +47,12 @@
 #include <google/protobuf/compiler/java/java_generator_factory.h>
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
+#include <google/protobuf/stubs/strutil.h>
 
 namespace google {
 namespace protobuf {
@@ -67,13 +64,6 @@ bool GenerateHasBits(const Descriptor* descriptor) {
   return SupportFieldPresence(descriptor->file()) ||
       HasRepeatedFields(descriptor);
 }
-
-string MapValueImmutableClassdName(const Descriptor* descriptor,
-                                   ClassNameResolver* name_resolver) {
-  const FieldDescriptor* value_field = descriptor->FindFieldByName("value");
-  GOOGLE_CHECK_EQ(FieldDescriptor::TYPE_MESSAGE, value_field->type());
-  return name_resolver->GetImmutableClassName(value_field->message_type());
-}
 }  // namespace
 
 MessageBuilderLiteGenerator::MessageBuilderLiteGenerator(
@@ -116,6 +106,7 @@ Generate(io::Printer* printer) {
 
     // oneofCase() and clearOneof()
     printer->Print(vars,
+      "@java.lang.Override\n"
       "public $oneof_capitalized_name$Case\n"
       "    get$oneof_capitalized_name$Case() {\n"
       "  return instance.get$oneof_capitalized_name$Case();\n"
diff --git a/src/google/protobuf/compiler/java/java_message_field.cc b/src/google/protobuf/compiler/java/java_message_field.cc
index ae84db1c..baa7f872 100644
--- a/src/google/protobuf/compiler/java/java_message_field.cc
+++ b/src/google/protobuf/compiler/java/java_message_field.cc
@@ -150,12 +150,9 @@ GenerateInterfaceMembers(io::Printer* printer) const {
   // interface so that builders can choose dynamically to either return a
   // message or a nested builder, so that asking for the interface doesn't
   // cause a message to ever be built.
-  if (SupportFieldPresence(descriptor_->file()) ||
-      descriptor_->containing_oneof() == NULL) {
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$boolean has$capitalized_name$();\n");
-  }
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "$deprecation$boolean has$capitalized_name$();\n");
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$$type$ get$capitalized_name$();\n");
@@ -174,39 +171,45 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public $type$ get$capitalized_name$() {\n"
+      "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
       "  return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
 
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
       "$deprecation$public $type$OrBuilder "
-      "get$capitalized_name$OrBuilder() {\n"
+      "${$get$capitalized_name$OrBuilder$}$() {\n"
       "  return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   } else {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $name$_ != null;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public $type$ get$capitalized_name$() {\n"
+      "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
       "  return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
 
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
       "$deprecation$public $type$OrBuilder "
-      "get$capitalized_name$OrBuilder() {\n"
+      "${$get$capitalized_name$OrBuilder$}$() {\n"
       "  return get$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 }
 
@@ -232,6 +235,7 @@ void ImmutableMessageFieldGenerator::PrintNestedBuilderFunction(
     const char* nested_builder_case,
     const char* trailing_code) const {
   printer->Print(variables_, method_prototype);
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(" {\n");
   printer->Indent();
   PrintNestedBuilderCondition(printer, regular_case, nested_builder_case);
@@ -267,20 +271,22 @@ GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   if (support_field_presence) {
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_builder$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   } else {
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $name$Builder_ != null || $name$_ != null;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   // Field getField()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public $type$ get$capitalized_name$()",
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$()",
     "return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n",
     "return $name$Builder_.getMessage();\n",
     NULL);
@@ -288,7 +294,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder setField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$($type$ value)",
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value)",
 
     "if (value == null) {\n"
     "  throw new NullPointerException();\n"
@@ -304,7 +310,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder setField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue)",
 
     "$name$_ = builderForValue.build();\n"
@@ -318,7 +324,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder mergeField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder merge$capitalized_name$($type$ value)",
+    "$deprecation$public Builder ${$merge$capitalized_name$$}$($type$ value)",
 
     support_field_presence
         ? "if ($get_has_field_bit_builder$ &&\n"
@@ -346,7 +352,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder clearField()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder clear$capitalized_name$()",
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$()",
 
     "$name$_ = null;\n"
     "$on_changed$\n",
@@ -361,14 +367,17 @@ GenerateBuilderMembers(io::Printer* printer) const {
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$.Builder get$capitalized_name$Builder() {\n"
+    "$deprecation$public $type$.Builder "
+    "${$get$capitalized_name$Builder$}$() {\n"
     "  $set_has_field_bit_builder$\n"
     "  $on_changed$\n"
     "  return get$capitalized_name$FieldBuilder().getBuilder();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder() {\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$() {\n"
     "  if ($name$Builder_ != null) {\n"
     "    return $name$Builder_.getMessageOrBuilder();\n"
     "  } else {\n"
@@ -376,6 +385,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "        $type$.getDefaultInstance() : $name$_;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "private com.google.protobuf.SingleFieldBuilder$ver$<\n"
@@ -530,30 +540,32 @@ ImmutableMessageOneofFieldGenerator::
 void ImmutableMessageOneofFieldGenerator::
 GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
-  if (SupportFieldPresence(descriptor_->file())) {
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
-      "  return $has_oneof_case_message$;\n"
-      "}\n");
-  }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
+    "  return $has_oneof_case_message$;\n"
+    "}\n");
+  printer->Annotate("{", "}", descriptor_);
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "     return ($type$) $oneof_name$_;\n"
     "  }\n"
     "  return $type$.getDefaultInstance();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder() {\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "     return ($type$) $oneof_name$_;\n"
     "  }\n"
     "  return $type$.getDefaultInstance();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableMessageOneofFieldGenerator::
@@ -571,19 +583,18 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // The comments above the methods below are based on a hypothetical
   // field of type "Field" called "Field".
 
-  if (SupportFieldPresence(descriptor_->file())) {
-    // boolean hasField()
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
-      "  return $has_oneof_case_message$;\n"
-      "}\n");
-  }
+  // boolean hasField()
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
+    "  return $has_oneof_case_message$;\n"
+    "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field getField()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public $type$ get$capitalized_name$()",
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$()",
 
     "if ($has_oneof_case_message$) {\n"
     "  return ($type$) $oneof_name$_;\n"
@@ -600,7 +611,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder setField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$($type$ value)",
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value)",
 
     "if (value == null) {\n"
     "  throw new NullPointerException();\n"
@@ -616,7 +627,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder setField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue)",
 
     "$oneof_name$_ = builderForValue.build();\n"
@@ -630,7 +641,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder mergeField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder merge$capitalized_name$($type$ value)",
+    "$deprecation$public Builder ${$merge$capitalized_name$$}$($type$ value)",
 
     "if ($has_oneof_case_message$ &&\n"
     "    $oneof_name$_ != $type$.getDefaultInstance()) {\n"
@@ -652,7 +663,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field.Builder clearField()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder clear$capitalized_name$()",
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$()",
 
     "if ($has_oneof_case_message$) {\n"
     "  $clear_oneof_case_message$;\n"
@@ -670,12 +681,15 @@ GenerateBuilderMembers(io::Printer* printer) const {
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$.Builder get$capitalized_name$Builder() {\n"
+    "$deprecation$public $type$.Builder "
+    "${$get$capitalized_name$Builder$}$() {\n"
     "  return get$capitalized_name$FieldBuilder().getBuilder();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder() {\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$() {\n"
     "  if (($has_oneof_case_message$) && ($name$Builder_ != null)) {\n"
     "    return $name$Builder_.getMessageOrBuilder();\n"
     "  } else {\n"
@@ -685,11 +699,12 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "    return $type$.getDefaultInstance();\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "private com.google.protobuf.SingleFieldBuilder$ver$<\n"
     "    $type$, $type$.Builder, $type$OrBuilder> \n"
-    "    get$capitalized_name$FieldBuilder() {\n"
+    "    ${$get$capitalized_name$FieldBuilder$}$() {\n"
     "  if ($name$Builder_ == null) {\n"
     "    if (!($has_oneof_case_message$)) {\n"
     "      $oneof_name$_ = $type$.getDefaultInstance();\n"
@@ -705,6 +720,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$;\n"
     "  return $name$Builder_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableMessageOneofFieldGenerator::
@@ -833,31 +849,38 @@ GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return $name$_;\n"   // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public java.util.List<? extends $type$OrBuilder> \n"
-    "    get$capitalized_name$OrBuilderList() {\n"
+    "    ${$get$capitalized_name$OrBuilderList$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder(\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$(\n"
     "    int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
 }
 
@@ -883,6 +906,7 @@ void RepeatedImmutableMessageFieldGenerator::PrintNestedBuilderFunction(
     const char* nested_builder_case,
     const char* trailing_code) const {
   printer->Print(variables_, method_prototype);
+  printer->Annotate("{", "}", descriptor_);
   printer->Print(" {\n");
   printer->Indent();
   PrintNestedBuilderCondition(printer, regular_case, nested_builder_case);
@@ -934,7 +958,8 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // List<Field> getRepeatedFieldList()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List()",
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$()",
 
     "return java.util.Collections.unmodifiableList($name$_);\n",
     "return $name$Builder_.getMessageList();\n",
@@ -944,7 +969,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // int getRepeatedFieldCount()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public int get$capitalized_name$Count()",
+    "$deprecation$public int ${$get$capitalized_name$Count$}$()",
 
     "return $name$_.size();\n",
     "return $name$Builder_.getCount();\n",
@@ -954,7 +979,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Field getRepeatedField(int index)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public $type$ get$capitalized_name$(int index)",
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index)",
 
     "return $name$_.get(index);\n",
 
@@ -965,7 +990,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder setRepeatedField(int index, Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value)",
     "if (value == null) {\n"
     "  throw new NullPointerException();\n"
@@ -979,7 +1004,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder setRepeatedField(int index, Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$.Builder builderForValue)",
 
     "ensure$capitalized_name$IsMutable();\n"
@@ -993,7 +1018,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder addRepeatedField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder add$capitalized_name$($type$ value)",
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value)",
 
     "if (value == null) {\n"
     "  throw new NullPointerException();\n"
@@ -1010,7 +1035,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder addRepeatedField(int index, Field value)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    int index, $type$ value)",
 
     "if (value == null) {\n"
@@ -1027,7 +1052,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder addRepeatedField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue)",
 
     "ensure$capitalized_name$IsMutable();\n"
@@ -1041,7 +1066,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder addRepeatedField(int index, Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    int index, $type$.Builder builderForValue)",
 
     "ensure$capitalized_name$IsMutable();\n"
@@ -1055,7 +1080,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder addAllRepeatedField(Iterable<Field> values)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $type$> values)",
 
     "ensure$capitalized_name$IsMutable();\n"
@@ -1070,7 +1095,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder clearAllRepeatedField()
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder clear$capitalized_name$()",
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$()",
 
     "$name$_ = java.util.Collections.emptyList();\n"
     "$clear_mutable_bit_builder$;\n"
@@ -1083,7 +1108,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // Builder removeRepeatedField(int index)
   WriteFieldDocComment(printer, descriptor_);
   PrintNestedBuilderFunction(printer,
-    "$deprecation$public Builder remove$capitalized_name$(int index)",
+    "$deprecation$public Builder ${$remove$capitalized_name$$}$(int index)",
 
     "ensure$capitalized_name$IsMutable();\n"
     "$name$_.remove(index);\n"
@@ -1095,14 +1120,16 @@ GenerateBuilderMembers(io::Printer* printer) const {
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$.Builder get$capitalized_name$Builder(\n"
+    "$deprecation$public $type$.Builder ${$get$capitalized_name$Builder$}$(\n"
     "    int index) {\n"
     "  return get$capitalized_name$FieldBuilder().getBuilder(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
       printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder(\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$(\n"
     "    int index) {\n"
     "  if ($name$Builder_ == null) {\n"
     "    return $name$_.get(index);"
@@ -1110,35 +1137,40 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "    return $name$Builder_.getMessageOrBuilder(index);\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
       printer->Print(variables_,
     "$deprecation$public java.util.List<? extends $type$OrBuilder> \n"
-    "     get$capitalized_name$OrBuilderList() {\n"
+    "     ${$get$capitalized_name$OrBuilderList$}$() {\n"
     "  if ($name$Builder_ != null) {\n"
     "    return $name$Builder_.getMessageOrBuilderList();\n"
     "  } else {\n"
     "    return java.util.Collections.unmodifiableList($name$_);\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
       printer->Print(variables_,
-    "$deprecation$public $type$.Builder add$capitalized_name$Builder() {\n"
+    "$deprecation$public $type$.Builder "
+    "${$add$capitalized_name$Builder$}$() {\n"
     "  return get$capitalized_name$FieldBuilder().addBuilder(\n"
     "      $type$.getDefaultInstance());\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
       printer->Print(variables_,
-    "$deprecation$public $type$.Builder add$capitalized_name$Builder(\n"
+    "$deprecation$public $type$.Builder ${$add$capitalized_name$Builder$}$(\n"
     "    int index) {\n"
     "  return get$capitalized_name$FieldBuilder().addBuilder(\n"
     "      index, $type$.getDefaultInstance());\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
       printer->Print(variables_,
     "$deprecation$public java.util.List<$type$.Builder> \n"
-    "     get$capitalized_name$BuilderList() {\n"
+    "     ${$get$capitalized_name$BuilderList$}$() {\n"
     "  return get$capitalized_name$FieldBuilder().getBuilderList();\n"
     "}\n"
     "private com.google.protobuf.RepeatedFieldBuilder$ver$<\n"
@@ -1155,6 +1187,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  }\n"
     "  return $name$Builder_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutableMessageFieldGenerator::
diff --git a/src/google/protobuf/compiler/java/java_message_field_lite.cc b/src/google/protobuf/compiler/java/java_message_field_lite.cc
index 0957676c..9cf6f363 100644
--- a/src/google/protobuf/compiler/java/java_message_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_message_field_lite.cc
@@ -129,16 +129,9 @@ int ImmutableMessageFieldLiteGenerator::GetNumBitsForBuilder() const {
 
 void ImmutableMessageFieldLiteGenerator::
 GenerateInterfaceMembers(io::Printer* printer) const {
-  // TODO(jonp): In the future, consider having a method specific to the
-  // interface so that builders can choose dynamically to either return a
-  // message or a nested builder, so that asking for the interface doesn't
-  // cause a message to ever be built.
-  if (SupportFieldPresence(descriptor_->file()) ||
-      descriptor_->containing_oneof() == NULL) {
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$boolean has$capitalized_name$();\n");
-  }
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "$deprecation$boolean has$capitalized_name$();\n");
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$$type$ get$capitalized_name$();\n");
@@ -154,25 +147,33 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public $type$ get$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
       "  return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   } else {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $name$_ != null;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public $type$ get$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
       "  return $name$_ == null ? $type$.getDefaultInstance() : $name$_;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   // Field.Builder setField(Field value)
@@ -198,7 +199,11 @@ GenerateMembers(io::Printer* printer) const {
   // Field.Builder mergeField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.SuppressWarnings({\"ReferenceEquality\"})\n"
     "private void merge$capitalized_name$($type$ value) {\n"
+    "  if (value == null) {\n"
+    "    throw new NullPointerException();\n"
+    "  }\n"
     "  if ($name$_ != null &&\n"
     "      $name$_ != $type$.getDefaultInstance()) {\n"
     "    $name$_ =\n"
@@ -226,53 +231,62 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // boolean hasField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public boolean has$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
     "  return instance.has$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field getField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder setField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "  }\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder setField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(builderForValue);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder mergeField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder merge$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder "
+    "${$merge$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.merge$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder clearField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableMessageFieldLiteGenerator::
@@ -390,21 +404,23 @@ ImmutableMessageOneofFieldLiteGenerator::
 void ImmutableMessageOneofFieldLiteGenerator::
 GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
-  if (SupportFieldPresence(descriptor_->file())) {
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
-      "  return $has_oneof_case_message$;\n"
-      "}\n");
-  }
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
+    "  return $has_oneof_case_message$;\n"
+    "}\n");
+  printer->Annotate("{", "}", descriptor_);
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "     return ($type$) $oneof_name$_;\n"
     "  }\n"
     "  return $type$.getDefaultInstance();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder setField(Field value)
   WriteFieldDocComment(printer, descriptor_);
@@ -430,6 +446,9 @@ GenerateMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "private void merge$capitalized_name$($type$ value) {\n"
+    "  if (value == null) {\n"
+    "    throw new NullPointerException();\n"
+    "  }\n"
     "  if ($has_oneof_case_message$ &&\n"
     "      $oneof_name$_ != $type$.getDefaultInstance()) {\n"
     "    $oneof_name$_ = $type$.newBuilder(($type$) $oneof_name$_)\n"
@@ -451,63 +470,71 @@ GenerateMembers(io::Printer* printer) const {
     "}\n");
 }
 
+
 void ImmutableMessageOneofFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   // The comments above the methods below are based on a hypothetical
   // field of type "Field" called "Field".
 
-  if (SupportFieldPresence(descriptor_->file())) {
-    // boolean hasField()
-    WriteFieldDocComment(printer, descriptor_);
-    printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
-      "  return instance.has$capitalized_name$();\n"
-      "}\n");
-  }
+  // boolean hasField()
+  WriteFieldDocComment(printer, descriptor_);
+  printer->Print(variables_,
+    "@java.lang.Override\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
+    "  return instance.has$capitalized_name$();\n"
+    "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field getField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder setField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder setField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(builderForValue);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder mergeField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder merge$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder "
+    "${$merge$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.merge$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field.Builder clearField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableMessageOneofFieldLiteGenerator::
@@ -614,31 +641,41 @@ GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return $name$_;\n"   // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public java.util.List<? extends $type$OrBuilder> \n"
-    "    get$capitalized_name$OrBuilderList() {\n"
+    "    ${$get$capitalized_name$OrBuilderList$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$OrBuilder get$capitalized_name$OrBuilder(\n"
+    "$deprecation$public $type$OrBuilder "
+    "${$get$capitalized_name$OrBuilder$}$(\n"
     "    int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   printer->Print(variables_,
     "private void ensure$capitalized_name$IsMutable() {\n"
@@ -744,110 +781,126 @@ GenerateBuilderMembers(io::Printer* printer) const {
   // List<Field> getRepeatedFieldList()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<$type$> get$capitalized_name$List() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<$type$> "
+    "${$get$capitalized_name$List$}$() {\n"
     "  return java.util.Collections.unmodifiableList(\n"
     "      instance.get$capitalized_name$List());\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // int getRepeatedFieldCount()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return instance.get$capitalized_name$Count();\n"
     "}");
+  printer->Annotate("{", "}", descriptor_);
 
   // Field getRepeatedField(int index)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return instance.get$capitalized_name$(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder setRepeatedField(int index, Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(index, value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder setRepeatedField(int index, Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$.Builder builderForValue) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(index, builderForValue);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder addRepeatedField(Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder addRepeatedField(int index, Field value)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(index, value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   // Builder addRepeatedField(Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    $type$.Builder builderForValue) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(builderForValue);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder addRepeatedField(int index, Field.Builder builderForValue)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    int index, $type$.Builder builderForValue) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(index, builderForValue);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder addAllRepeatedField(Iterable<Field> values)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $type$> values) {\n"
     "  copyOnWrite();\n"
     "  instance.addAll$capitalized_name$(values);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder clearAllRepeatedField()
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   // Builder removeRepeatedField(int index)
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder remove$capitalized_name$(int index) {\n"
+    "$deprecation$public Builder ${$remove$capitalized_name$$}$(int index) {\n"
     "  copyOnWrite();\n"
     "  instance.remove$capitalized_name$(index);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutableMessageFieldLiteGenerator::
@@ -856,6 +909,7 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
     "get$capitalized_name$FieldBuilder();\n");
 }
 
+
 void RepeatedImmutableMessageFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
   printer->Print(variables_, "$name$_ = emptyProtobufList();\n");
diff --git a/src/google/protobuf/compiler/java/java_message_field_lite.h b/src/google/protobuf/compiler/java/java_message_field_lite.h
index dbb263de..7c814c6d 100644
--- a/src/google/protobuf/compiler/java/java_message_field_lite.h
+++ b/src/google/protobuf/compiler/java/java_message_field_lite.h
@@ -106,6 +106,7 @@ class ImmutableMessageOneofFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutableMessageOneofFieldLiteGenerator);
 };
@@ -135,6 +136,7 @@ class RepeatedImmutableMessageFieldLiteGenerator
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  protected:
diff --git a/src/google/protobuf/compiler/java/java_message_lite.cc b/src/google/protobuf/compiler/java/java_message_lite.cc
index 048d5892..3a512e8d 100644
--- a/src/google/protobuf/compiler/java/java_message_lite.cc
+++ b/src/google/protobuf/compiler/java/java_message_lite.cc
@@ -38,9 +38,6 @@
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/compiler/java/java_context.h>
@@ -52,12 +49,13 @@
 #include <google/protobuf/compiler/java/java_message_builder.h>
 #include <google/protobuf/compiler/java/java_message_builder_lite.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
+#include <google/protobuf/stubs/strutil.h>
+
 
 namespace google {
 namespace protobuf {
@@ -68,6 +66,14 @@ using internal::WireFormat;
 using internal::WireFormatLite;
 
 namespace {
+bool EnableExperimentalRuntimeForLite() {
+#ifdef PROTOBUF_EXPERIMENT
+  return PROTOBUF_EXPERIMENT;
+#else   // PROTOBUF_EXPERIMENT
+  return false;
+#endif  // !PROTOBUF_EXPERIMENT
+}
+
 bool GenerateHasBits(const Descriptor* descriptor) {
   return SupportFieldPresence(descriptor->file()) ||
       HasRepeatedFields(descriptor);
@@ -124,24 +130,28 @@ void ImmutableMessageLiteGenerator::GenerateInterface(io::Printer* printer) {
                                 /* immutable = */ true, "OrBuilder");
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
-        "public interface $classname$OrBuilder$idend$ extends \n"
+        "$deprecation$public interface ${$$classname$OrBuilder$}$ extends \n"
         "    $extra_interfaces$\n"
         "     com.google.protobuf.GeneratedMessageLite.\n"
         "          ExtendableMessageOrBuilder<\n"
         "              $classname$, $classname$.Builder> {\n",
+        "deprecation", descriptor_->options().deprecated() ?
+            "@java.lang.Deprecated " : "",
         "extra_interfaces", ExtraMessageOrBuilderInterfaces(descriptor_),
         "classname", descriptor_->name(),
-        "idend", "");
+        "{", "", "}", "");
   } else {
     printer->Print(
-        "public interface $classname$OrBuilder$idend$ extends\n"
+        "$deprecation$public interface ${$$classname$OrBuilder$}$ extends\n"
         "    $extra_interfaces$\n"
         "    com.google.protobuf.MessageLiteOrBuilder {\n",
+        "deprecation", descriptor_->options().deprecated() ?
+            "@java.lang.Deprecated " : "",
         "extra_interfaces", ExtraMessageOrBuilderInterfaces(descriptor_),
         "classname", descriptor_->name(),
-        "idend", "");
+        "{", "", "}", "");
   }
-  printer->Annotate("classname", "idend", descriptor_);
+  printer->Annotate("{", "}", descriptor_);
 
   printer->Indent();
     for (int i = 0; i < descriptor_->field_count(); i++) {
@@ -174,6 +184,8 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
   variables["static"] = is_own_file ? " " : " static ";
   variables["classname"] = descriptor_->name();
   variables["extra_interfaces"] = ExtraMessageInterfaces(descriptor_);
+  variables["deprecation"] = descriptor_->options().deprecated()
+      ? "@java.lang.Deprecated " : "";
 
   WriteMessageDocComment(printer, descriptor_);
   MaybePrintGeneratedAnnotation(context_, printer, descriptor_,
@@ -184,7 +196,7 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
   string builder_type;
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(variables,
-      "public $static$final class $classname$ extends\n"
+      "$deprecation$public $static$final class $classname$ extends\n"
       "    com.google.protobuf.GeneratedMessageLite.ExtendableMessage<\n"
       "      $classname$, $classname$.Builder> implements\n"
       "    $extra_interfaces$\n"
@@ -194,7 +206,7 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
         name_resolver_->GetImmutableClassName(descriptor_));
   } else {
     printer->Print(variables,
-        "public $static$final class $classname$ extends\n"
+        "$deprecation$public $static$final class $classname$ extends\n"
         "    com.google.protobuf.GeneratedMessageLite<\n"
         "        $classname$, $classname$.Builder> implements\n"
         "    $extra_interfaces$\n"
@@ -295,6 +307,7 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
       "    default: return null;\n"
       "  }\n"
       "}\n"
+      "@java.lang.Override\n"
       "public int getNumber() {\n"
       "  return this.value;\n"
       "}\n",
@@ -303,6 +316,7 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
     printer->Print("};\n\n");
     // oneofCase()
     printer->Print(vars,
+      "@java.lang.Override\n"
       "public $oneof_capitalized_name$Case\n"
       "get$oneof_capitalized_name$Case() {\n"
       "  return $oneof_capitalized_name$Case.forNumber(\n"
@@ -325,72 +339,81 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
     printer->Print("\n");
   }
 
-  GenerateMessageSerializationMethods(printer);
+  if (!EnableExperimentalRuntime(context_)) {
+    GenerateMessageSerializationMethods(printer);
+  }
 
   GenerateParseFromMethods(printer);
   GenerateBuilder(printer);
 
   if (HasRequiredFields(descriptor_)) {
     // Memoizes whether the protocol buffer is fully initialized (has all
-    // required fields). -1 means not yet computed. 0 means false and 1 means
-    // true.
+    // required fields). 0 means false, 1 means true, and all other values
+    // mean not yet computed.
     printer->Print(
-      "private byte memoizedIsInitialized = -1;\n");
+      "private byte memoizedIsInitialized = 2;\n");
   }
 
   printer->Print(
-    "protected final Object dynamicMethod(\n"
-    "    com.google.protobuf.GeneratedMessageLite.MethodToInvoke method,\n"
-    "    Object arg0, Object arg1) {\n"
-    "  switch (method) {\n"
-    "    case NEW_MUTABLE_INSTANCE: {\n"
-    "      return new $classname$();\n"
-    "    }\n",
-    "classname", name_resolver_->GetImmutableClassName(descriptor_));
+      "@java.lang.Override\n"
+      "@java.lang.SuppressWarnings({\"unchecked\", \"fallthrough\"})\n"
+      "protected final java.lang.Object dynamicMethod(\n"
+      "    com.google.protobuf.GeneratedMessageLite.MethodToInvoke method,\n"
+      "    java.lang.Object arg0, java.lang.Object arg1) {\n"
+      "  switch (method) {\n"
+      "    case NEW_MUTABLE_INSTANCE: {\n"
+      "      return new $classname$();\n"
+      "    }\n",
+      "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
   printer->Indent();
   printer->Indent();
 
   printer->Print(
-    "case IS_INITIALIZED: {\n");
+    "case NEW_BUILDER: {\n");
+
   printer->Indent();
-  GenerateDynamicMethodIsInitialized(printer);
+  GenerateDynamicMethodNewBuilder(printer);
   printer->Outdent();
 
-  printer->Print(
-    "}\n"
-    "case MAKE_IMMUTABLE: {\n");
+  if (!EnableExperimentalRuntimeForLite()) {
+    printer->Print(
+      "}\n"
+      "case IS_INITIALIZED: {\n");
+    printer->Indent();
+    GenerateDynamicMethodIsInitialized(printer);
+    printer->Outdent();
 
-  printer->Indent();
-  GenerateDynamicMethodMakeImmutable(printer);
-  printer->Outdent();
+    printer->Print("}\n");
 
-  printer->Print(
-    "}\n"
-    "case NEW_BUILDER: {\n");
+    printer->Print(
+      "case MAKE_IMMUTABLE: {\n");
 
-  printer->Indent();
-  GenerateDynamicMethodNewBuilder(printer);
-  printer->Outdent();
+    printer->Indent();
+    GenerateDynamicMethodMakeImmutable(printer);
+    printer->Outdent();
 
-  printer->Print(
-    "}\n"
-    "case VISIT: {\n");
+    printer->Print(
+        "}\n"
+        "case VISIT: {\n");
 
-  printer->Indent();
-  GenerateDynamicMethodVisit(printer);
-  printer->Outdent();
+    printer->Indent();
+    GenerateDynamicMethodVisit(printer);
+    printer->Outdent();
 
-  printer->Print(
-    "}\n"
-    "case MERGE_FROM_STREAM: {\n");
+    printer->Print(
+        "}\n"
+        "case MERGE_FROM_STREAM: {\n");
+
+    printer->Indent();
+    GenerateDynamicMethodMergeFromStream(printer);
+    printer->Outdent();
+  }
 
-  printer->Indent();
-  GenerateDynamicMethodMergeFromStream(printer);
-  printer->Outdent();
 
   printer->Print(
     "}\n"
+    "// fall through\n"
     "case GET_DEFAULT_INSTANCE: {\n"
     "  return DEFAULT_INSTANCE;\n"
     "}\n"
@@ -399,20 +422,46 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
     // manipulating static fields but that has exceptional cost on Android as
     // it will generate an extra class for every message. Instead, use the
     // double-check locking pattern which works just as well.
-    "  if (PARSER == null) {"
+    //
+    // The "parser" temporary mirrors the "PARSER" field to eliminate a read
+    // at the final return statement.
+    "  com.google.protobuf.Parser<$classname$> parser = PARSER;\n"
+    "  if (parser == null) {\n"
     "    synchronized ($classname$.class) {\n"
-    "      if (PARSER == null) {\n"
-    "        PARSER = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);\n"
+    "      parser = PARSER;\n"
+    "      if (parser == null) {\n"
+    "        parser = new DefaultInstanceBasedParser(DEFAULT_INSTANCE);\n"
+    "        PARSER = parser;\n"
     "      }\n"
     "    }\n"
     "  }\n"
-    "  return PARSER;\n"
-    "}\n",
+    "  return parser;\n",
     "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
   printer->Outdent();
-  printer->Outdent();
 
+  if (HasRequiredFields(descriptor_)) {
+    printer->Print(
+        "}\n"
+        "case GET_MEMOIZED_IS_INITIALIZED: {\n"
+        "  return memoizedIsInitialized;\n"
+        "}\n"
+        "case SET_MEMOIZED_IS_INITIALIZED: {\n"
+        "  memoizedIsInitialized = (byte) (arg0 == null ? 0 : 1);\n"
+        "  return null;\n"
+        "}\n");
+  } else {
+    printer->Print(
+        "}\n"
+        "case GET_MEMOIZED_IS_INITIALIZED: {\n"
+        "  return (byte) 1;\n"
+        "}\n"
+        "case SET_MEMOIZED_IS_INITIALIZED: {\n"
+        "  return null;\n"
+        "}\n");
+  }
+
+  printer->Outdent();
   printer->Print(
     "  }\n"
     "  throw new UnsupportedOperationException();\n"
@@ -434,11 +483,24 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
 
   printer->Print(
     "static {\n"
+    "  // New instances are implicitly immutable so no need to make\n"
+    "  // immutable.\n"
     "  DEFAULT_INSTANCE = new $classname$();\n"
-    "  DEFAULT_INSTANCE.makeImmutable();\n"
     "}\n"
     "\n",
     "classname", descriptor_->name());
+  if (EnableExperimentalRuntimeForLite()) {
+    // Register the default instance in a map. This map will be used by
+    // experimental runtime to lookup default instance given a class instance
+    // without using Java reflection.
+    printer->Print(
+        "static {\n"
+        "  com.google.protobuf.GeneratedMessageLite.registerDefaultInstance(\n"
+        "    $classname$.class, DEFAULT_INSTANCE);\n"
+        "}\n",
+        "classname", descriptor_->name());
+  }
+
   printer->Print(
       "public static $classname$ getDefaultInstance() {\n"
       "  return DEFAULT_INSTANCE;\n"
@@ -446,6 +508,17 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
       "\n",
       "classname", name_resolver_->GetImmutableClassName(descriptor_));
 
+  // 'of' method for Wrappers
+  if (IsWrappersProtoFile(descriptor_->file())) {
+    printer->Print(
+        "public static $classname$ of($field_type$ value) {\n"
+        "  return newBuilder().setValue(value).build();\n"
+        "}\n"
+        "\n",
+        "classname", name_resolver_->GetImmutableClassName(descriptor_),
+        "field_type", PrimitiveTypeName(GetJavaType(descriptor_->field(0))));
+  }
+
   GenerateParser(printer);
 
   // Extensions must be declared after the DEFAULT_INSTANCE is initialized
@@ -456,15 +529,21 @@ void ImmutableMessageLiteGenerator::Generate(io::Printer* printer) {
         .Generate(printer);
   }
 
+
   printer->Outdent();
   printer->Print("}\n\n");
 }
 
+
 // ===================================================================
 
 void ImmutableMessageLiteGenerator::
 GenerateMessageSerializationMethods(io::Printer* printer) {
-  google::protobuf::scoped_array<const FieldDescriptor * > sorted_fields(
+  if (EnableExperimentalRuntimeForLite()) {
+    return;
+  }
+
+  std::unique_ptr<const FieldDescriptor * []> sorted_fields(
       SortFieldsByNumber(descriptor_));
 
   std::vector<const Descriptor::ExtensionRange*> sorted_extensions;
@@ -475,42 +554,41 @@ GenerateMessageSerializationMethods(io::Printer* printer) {
             ExtensionRangeOrdering());
 
   printer->Print(
+    "@java.lang.Override\n"
     "public void writeTo(com.google.protobuf.CodedOutputStream output)\n"
     "                    throws java.io.IOException {\n");
   printer->Indent();
   if (HasPackedFields(descriptor_)) {
     // writeTo(CodedOutputStream output) might be invoked without
     // getSerializedSize() ever being called, but we need the memoized
-    // sizes in case this message has packed fields. Rather than emit checks for
-    // each packed field, just call getSerializedSize() up front.
-    // In most cases, getSerializedSize() will have already been called anyway
-    // by one of the wrapper writeTo() methods, making this call cheap.
-    printer->Print(
-      "getSerializedSize();\n");
+    // sizes in case this message has packed fields. Rather than emit checks
+    // for each packed field, just call getSerializedSize() up front. In most
+    // cases, getSerializedSize() will have already been called anyway by one
+    // of the wrapper writeTo() methods, making this call cheap.
+    printer->Print("getSerializedSize();\n");
   }
 
   if (descriptor_->extension_range_count() > 0) {
     if (descriptor_->options().message_set_wire_format()) {
       printer->Print(
-        "com.google.protobuf.GeneratedMessageLite\n"
-        "  .ExtendableMessage<$classname$, $classname$.Builder>\n"
-        "    .ExtensionWriter extensionWriter =\n"
-        "      newMessageSetExtensionWriter();\n",
-        "classname", name_resolver_->GetImmutableClassName(descriptor_));
+          "com.google.protobuf.GeneratedMessageLite\n"
+          "  .ExtendableMessage<$classname$, $classname$.Builder>\n"
+          "    .ExtensionWriter extensionWriter =\n"
+          "      newMessageSetExtensionWriter();\n",
+          "classname", name_resolver_->GetImmutableClassName(descriptor_));
     } else {
       printer->Print(
-        "com.google.protobuf.GeneratedMessageLite\n"
-        "  .ExtendableMessage<$classname$, $classname$.Builder>\n"
-        "    .ExtensionWriter extensionWriter =\n"
-        "      newExtensionWriter();\n",
-        "classname", name_resolver_->GetImmutableClassName(descriptor_));
+          "com.google.protobuf.GeneratedMessageLite\n"
+          "  .ExtendableMessage<$classname$, $classname$.Builder>\n"
+          "    .ExtensionWriter extensionWriter =\n"
+          "      newExtensionWriter();\n",
+          "classname", name_resolver_->GetImmutableClassName(descriptor_));
     }
   }
 
   // Merge the fields and the extension ranges, both sorted by field number.
   for (int i = 0, j = 0;
-       i < descriptor_->field_count() || j < sorted_extensions.size();
-       ) {
+       i < descriptor_->field_count() || j < sorted_extensions.size();) {
     if (i == descriptor_->field_count()) {
       GenerateSerializeOneExtensionRange(printer, sorted_extensions[j++]);
     } else if (j == sorted_extensions.size()) {
@@ -522,26 +600,24 @@ GenerateMessageSerializationMethods(io::Printer* printer) {
     }
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "unknownFields.writeAsMessageSetTo(output);\n");
-    } else {
-      printer->Print(
-        "unknownFields.writeTo(output);\n");
-    }
+  if (descriptor_->options().message_set_wire_format()) {
+    printer->Print("unknownFields.writeAsMessageSetTo(output);\n");
+  } else {
+    printer->Print("unknownFields.writeTo(output);\n");
   }
 
   printer->Outdent();
   printer->Print(
-    "}\n"
-    "\n"
-    "public int getSerializedSize() {\n"
-    "  int size = memoizedSerializedSize;\n"
-    "  if (size != -1) return size;\n"
-    "\n"
-    "  size = 0;\n");
+      "}\n"
+      "\n"
+      "@java.lang.Override\n"
+      "public int getSerializedSize() {\n"
+      "  int size = memoizedSerializedSize;\n"
+      "  if (size != -1) return size;\n"
+      "\n");
   printer->Indent();
+  printer->Print(
+      "size = 0;\n");
 
   for (int i = 0; i < descriptor_->field_count(); i++) {
     field_generators_.get(sorted_fields[i]).GenerateSerializedSizeCode(printer);
@@ -549,28 +625,24 @@ GenerateMessageSerializationMethods(io::Printer* printer) {
 
   if (descriptor_->extension_range_count() > 0) {
     if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "size += extensionsSerializedSizeAsMessageSet();\n");
+      printer->Print("size += extensionsSerializedSizeAsMessageSet();\n");
     } else {
-      printer->Print(
-        "size += extensionsSerializedSize();\n");
+      printer->Print("size += extensionsSerializedSize();\n");
     }
   }
 
-  if (PreserveUnknownFields(descriptor_)) {
-    if (descriptor_->options().message_set_wire_format()) {
-      printer->Print(
-        "size += unknownFields.getSerializedSizeAsMessageSet();\n");
-    } else {
-      printer->Print(
-        "size += unknownFields.getSerializedSize();\n");
-    }
+  if (descriptor_->options().message_set_wire_format()) {
+    printer->Print("size += unknownFields.getSerializedSizeAsMessageSet();\n");
+  } else {
+    printer->Print("size += unknownFields.getSerializedSize();\n");
   }
 
+  printer->Print(
+      "memoizedSerializedSize = size;\n"
+      "return size;\n");
+
   printer->Outdent();
   printer->Print(
-    "  memoizedSerializedSize = size;\n"
-    "  return size;\n"
     "}\n"
     "\n");
 }
@@ -582,6 +654,19 @@ GenerateParseFromMethods(io::Printer* printer) {
   //   for code size.
   printer->Print(
     "public static $classname$ parseFrom(\n"
+    "    java.nio.ByteBuffer data)\n"
+    "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
+    "  return com.google.protobuf.GeneratedMessageLite.parseFrom(\n"
+    "      DEFAULT_INSTANCE, data);\n"
+    "}\n"
+    "public static $classname$ parseFrom(\n"
+    "    java.nio.ByteBuffer data,\n"
+    "    com.google.protobuf.ExtensionRegistryLite extensionRegistry)\n"
+    "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
+    "  return com.google.protobuf.GeneratedMessageLite.parseFrom(\n"
+    "      DEFAULT_INSTANCE, data, extensionRegistry);\n"
+    "}\n"
+    "public static $classname$ parseFrom(\n"
     "    com.google.protobuf.ByteString data)\n"
     "    throws com.google.protobuf.InvalidProtocolBufferException {\n"
     "  return com.google.protobuf.GeneratedMessageLite.parseFrom(\n"
@@ -662,10 +747,10 @@ void ImmutableMessageLiteGenerator::GenerateSerializeOneExtensionRange(
 void ImmutableMessageLiteGenerator::GenerateBuilder(io::Printer* printer) {
   printer->Print(
     "public static Builder newBuilder() {\n"
-    "  return DEFAULT_INSTANCE.toBuilder();\n"
+    "  return (Builder) DEFAULT_INSTANCE.createBuilder();\n"
     "}\n"
     "public static Builder newBuilder($classname$ prototype) {\n"
-    "  return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);\n"
+    "  return (Builder) DEFAULT_INSTANCE.createBuilder(prototype);\n"
     "}\n"
     "\n",
     "classname", name_resolver_->GetImmutableClassName(descriptor_));
@@ -684,7 +769,10 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
     return;
   }
 
-  // Don't directly compare to -1 to avoid an Android x86 JIT bug.
+  // TODO(xiaofeng): Remove this when b/64445758 is fixed. We don't need to
+  // check memoizedIsInitialized here because the caller does that already,
+  // but right now proguard proto shrinker asserts on the bytecode layout of
+  // this code so it can't be removed until proguard is updated.
   printer->Print(
     "byte isInitialized = memoizedIsInitialized;\n"
     "if (isInitialized == 1) return DEFAULT_INSTANCE;\n"
@@ -702,9 +790,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
     if (field->is_required()) {
       printer->Print(
         "if (!has$name$()) {\n"
-        "  if (shouldMemoize) {\n"
-        "    memoizedIsInitialized = 0;\n"
-        "  }\n"
         "  return null;\n"
         "}\n",
         "name", info->capitalized_name);
@@ -721,9 +806,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
         case FieldDescriptor::LABEL_REQUIRED:
           printer->Print(
             "if (!get$name$().isInitialized()) {\n"
-            "  if (shouldMemoize) {\n"
-            "    memoizedIsInitialized = 0;\n"
-            "  }\n"
             "  return null;\n"
             "}\n",
             "type", name_resolver_->GetImmutableClassName(
@@ -747,9 +829,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
           }
           printer->Print(
             "  if (!get$name$().isInitialized()) {\n"
-            "    if (shouldMemoize) {\n"
-            "      memoizedIsInitialized = 0;\n"
-            "    }\n"
             "    return null;\n"
             "  }\n"
             "}\n",
@@ -760,9 +839,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
             printer->Print(
               "for ($type$ item : get$name$Map().values()) {\n"
               "  if (!item.isInitialized()) {\n"
-              "    if (shouldMemoize) {\n"
-              "      memoizedIsInitialized = 0;\n"
-              "    }\n"
               "    return null;\n"
               "  }\n"
               "}\n",
@@ -773,9 +849,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
             printer->Print(
               "for (int i = 0; i < get$name$Count(); i++) {\n"
               "  if (!get$name$(i).isInitialized()) {\n"
-              "    if (shouldMemoize) {\n"
-              "      memoizedIsInitialized = 0;\n"
-              "    }\n"
               "    return null;\n"
               "  }\n"
               "}\n",
@@ -791,17 +864,11 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodIsInitialized(
   if (descriptor_->extension_range_count() > 0) {
     printer->Print(
       "if (!extensionsAreInitialized()) {\n"
-      "  if (shouldMemoize) {\n"
-      "    memoizedIsInitialized = 0;\n"
-      "  }\n"
       "  return null;\n"
       "}\n");
   }
 
   printer->Print(
-    "if (shouldMemoize) memoizedIsInitialized = 1;\n");
-
-  printer->Print(
     "return DEFAULT_INSTANCE;\n"
     "\n");
 }
@@ -928,26 +995,70 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodMergeFromStream(
       "com.google.protobuf.CodedInputStream input =\n"
       "    (com.google.protobuf.CodedInputStream) arg0;\n"
       "com.google.protobuf.ExtensionRegistryLite extensionRegistry =\n"
-      "    (com.google.protobuf.ExtensionRegistryLite) arg1;\n");
+      "    (com.google.protobuf.ExtensionRegistryLite) arg1;\n"
+      "if (extensionRegistry == null) {\n"
+      "  throw new java.lang.NullPointerException();\n"
+      "}\n");
   printer->Print(
       "try {\n");
   printer->Indent();
-  printer->Print(
-    "boolean done = false;\n"
-    "while (!done) {\n");
-  printer->Indent();
+  if (EnableExperimentalRuntime(context_)) {
+    printer->Print(
+        "mergeFromInternal(input, extensionRegistry);\n"
+        "return DEFAULT_INSTANCE;\n");
+  } else {
+    printer->Print(
+        "boolean done = false;\n"
+        "while (!done) {\n");
+    printer->Indent();
 
-  printer->Print(
-    "int tag = input.readTag();\n"
-    "switch (tag) {\n");
-  printer->Indent();
+    printer->Print(
+        "int tag = input.readTag();\n"
+        "switch (tag) {\n");
+    printer->Indent();
 
-  printer->Print(
-    "case 0:\n"          // zero signals EOF / limit reached
-    "  done = true;\n"
-    "  break;\n");
+    printer->Print(
+        "case 0:\n"  // zero signals EOF / limit reached
+        "  done = true;\n"
+        "  break;\n");
+
+    std::unique_ptr<const FieldDescriptor* []> sorted_fields(
+        SortFieldsByNumber(descriptor_));
+    for (int i = 0; i < descriptor_->field_count(); i++) {
+      const FieldDescriptor* field = sorted_fields[i];
+      uint32 tag = WireFormatLite::MakeTag(
+          field->number(), WireFormat::WireTypeForFieldType(field->type()));
+
+      printer->Print("case $tag$: {\n", "tag",
+                     SimpleItoa(static_cast<int32>(tag)));
+      printer->Indent();
+
+      field_generators_.get(field).GenerateParsingCode(printer);
+
+      printer->Outdent();
+      printer->Print(
+        "  break;\n"
+        "}\n");
+
+      if (field->is_packable()) {
+        // To make packed = true wire compatible, we generate parsing code from
+        // a packed version of this field regardless of
+        // field->options().packed().
+        uint32 packed_tag = WireFormatLite::MakeTag(
+            field->number(), WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
+        printer->Print("case $tag$: {\n", "tag",
+                       SimpleItoa(static_cast<int32>(packed_tag)));
+        printer->Indent();
+
+        field_generators_.get(field).GenerateParsingCodeFromPacked(printer);
+
+        printer->Outdent();
+        printer->Print(
+            "  break;\n"
+            "}\n");
+      }
+    }
 
-  if (PreserveUnknownFields(descriptor_)) {
     if (descriptor_->extension_range_count() > 0) {
       if (descriptor_->options().message_set_wire_format()) {
         printer->Print(
@@ -971,68 +1082,22 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodMergeFromStream(
       }
     } else {
       printer->Print(
-        "default: {\n"
-        "  if (!parseUnknownField(tag, input)) {\n"
-        "    done = true;\n"  // it's an endgroup tag
-        "  }\n"
-        "  break;\n"
-        "}\n");
+          "default: {\n"
+          "  if (!parseUnknownField(tag, input)) {\n"
+          "    done = true;\n"  // it's an endgroup tag
+          "  }\n"
+          "  break;\n"
+          "}\n");
     }
-  } else {
-    printer->Print(
-      "default: {\n"
-      "  if (!input.skipField(tag)) {\n"
-      "    done = true;\n"  // it's an endgroup tag
-      "  }\n"
-      "  break;\n"
-      "}\n");
-  }
-
-  google::protobuf::scoped_array<const FieldDescriptor * > sorted_fields(
-      SortFieldsByNumber(descriptor_));
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = sorted_fields[i];
-    uint32 tag = WireFormatLite::MakeTag(field->number(),
-      WireFormat::WireTypeForFieldType(field->type()));
-
-    printer->Print(
-      "case $tag$: {\n",
-      "tag", SimpleItoa(static_cast<int32>(tag)));
-    printer->Indent();
-
-    field_generators_.get(field).GenerateParsingCode(printer);
 
     printer->Outdent();
+    printer->Outdent();
     printer->Print(
-      "  break;\n"
-      "}\n");
-
-    if (field->is_packable()) {
-      // To make packed = true wire compatible, we generate parsing code from a
-      // packed version of this field regardless of field->options().packed().
-      uint32 packed_tag = WireFormatLite::MakeTag(field->number(),
-        WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
-      printer->Print(
-        "case $tag$: {\n",
-        "tag", SimpleItoa(static_cast<int32>(packed_tag)));
-      printer->Indent();
-
-      field_generators_.get(field).GenerateParsingCodeFromPacked(printer);
-
-      printer->Outdent();
-      printer->Print(
-        "  break;\n"
-        "}\n");
-    }
+        "  }\n"  // switch (tag)
+        "}\n");  // while (!done)
   }
 
   printer->Outdent();
-  printer->Outdent();
-  printer->Print(
-      "  }\n"     // switch (tag)
-      "}\n");     // while (!done)
-
-  printer->Outdent();
   printer->Print(
       "} catch (com.google.protobuf.InvalidProtocolBufferException e) {\n"
       "  throw new RuntimeException(e.setUnfinishedMessage(this));\n"
@@ -1050,21 +1115,6 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodMergeFromStream(
 
 // ===================================================================
 
-namespace {
-bool CheckHasBitsForEqualsAndHashCode(const FieldDescriptor* field) {
-  if (field->is_repeated()) {
-    return false;
-  }
-  if (SupportFieldPresence(field->file())) {
-    return true;
-  }
-  return GetJavaType(field) == JAVATYPE_MESSAGE &&
-      field->containing_oneof() == NULL;
-}
-}  // namespace
-
-// ===================================================================
-
 void ImmutableMessageLiteGenerator::
 GenerateExtensionRegistrationCode(io::Printer* printer) {
   for (int i = 0; i < descriptor_->extension_count(); i++) {
diff --git a/src/google/protobuf/compiler/java/java_name_resolver.cc b/src/google/protobuf/compiler/java/java_name_resolver.cc
index bffe4f16..1673b4ee 100644
--- a/src/google/protobuf/compiler/java/java_name_resolver.cc
+++ b/src/google/protobuf/compiler/java/java_name_resolver.cc
@@ -33,6 +33,7 @@
 #include <map>
 #include <string>
 
+
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/stubs/substitute.h>
 
diff --git a/src/google/protobuf/compiler/java/java_options.h b/src/google/protobuf/compiler/java/java_options.h
index 7bce1447..e4e7d5e2 100644
--- a/src/google/protobuf/compiler/java/java_options.h
+++ b/src/google/protobuf/compiler/java/java_options.h
@@ -59,10 +59,10 @@ struct Options {
   bool annotate_code;
   // Name of a file where we will write a list of generated .meta file names,
   // one per line.
-  string annotation_list_file;
+  std::string annotation_list_file;
   // Name of a file where we will write a list of generated file names, one
   // per line.
-  string output_list_file;
+  std::string output_list_file;
 };
 
 }  // namespace java
diff --git a/src/google/protobuf/compiler/java/java_plugin_unittest.cc b/src/google/protobuf/compiler/java/java_plugin_unittest.cc
index 3e4910c8..87f687da 100644
--- a/src/google/protobuf/compiler/java/java_plugin_unittest.cc
+++ b/src/google/protobuf/compiler/java/java_plugin_unittest.cc
@@ -35,9 +35,6 @@
 //   worth.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/java/java_generator.h>
 #include <google/protobuf/compiler/command_line_interface.h>
@@ -76,7 +73,7 @@ class TestGenerator : public CodeGenerator {
 
   void TryInsert(const string& filename, const string& insertion_point,
                  GeneratorContext* context) const {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         context->OpenForInsert(filename, insertion_point));
     io::Printer printer(output.get(), '$');
     printer.Print("// inserted $name$\n", "name", insertion_point);
diff --git a/src/google/protobuf/compiler/java/java_primitive_field.cc b/src/google/protobuf/compiler/java/java_primitive_field.cc
index fa1047e8..71ee0992 100644
--- a/src/google/protobuf/compiler/java/java_primitive_field.cc
+++ b/src/google/protobuf/compiler/java/java_primitive_field.cc
@@ -190,16 +190,18 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutablePrimitiveFieldGenerator::
@@ -210,31 +212,35 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_builder$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "$null_check$"
     "  $set_has_field_bit_builder$\n"
     "  $name$_ = value;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $clear_has_field_bit_builder$\n");
+  printer->Annotate("{", "}", descriptor_);
   JavaType type = GetJavaType(descriptor_);
   if (type == JAVATYPE_STRING || type == JAVATYPE_BYTES) {
     // The default value is not a simple literal so we want to avoid executing
@@ -441,19 +447,21 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    return ($boxed_type$) $oneof_name$_;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 
@@ -462,33 +470,36 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    return ($boxed_type$) $oneof_name$_;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "$null_check$"
     "  $set_oneof_case_message$;\n"
     "  $oneof_name$_ = value;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    $clear_oneof_case_message$;\n"
     "    $oneof_name$_ = null;\n"
@@ -496,6 +507,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  }\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutablePrimitiveOneofFieldGenerator::
@@ -523,8 +535,17 @@ void ImmutablePrimitiveOneofFieldGenerator::
 GenerateSerializationCode(io::Printer* printer) const {
   printer->Print(variables_,
     "if ($has_oneof_case_message$) {\n"
-    "  output.write$capitalized_type$(\n"
-    "      $number$, ($type$)(($boxed_type$) $oneof_name$_));\n"
+    "  output.write$capitalized_type$(\n");
+  // $type$ and $boxed_type$ is the same for bytes fields so we don't need to
+  // do redundant casts.
+  if (GetJavaType(descriptor_) == JAVATYPE_BYTES) {
+    printer->Print(variables_,
+      "      $number$, ($type$) $oneof_name$_);\n");
+  } else {
+    printer->Print(variables_,
+      "      $number$, ($type$)(($boxed_type$) $oneof_name$_));\n");
+  }
+  printer->Print(
     "}\n");
 }
 
@@ -533,8 +554,17 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
   printer->Print(variables_,
     "if ($has_oneof_case_message$) {\n"
     "  size += com.google.protobuf.CodedOutputStream\n"
-    "    .compute$capitalized_type$Size(\n"
-    "        $number$, ($type$)(($boxed_type$) $oneof_name$_));\n"
+    "    .compute$capitalized_type$Size(\n");
+  // $type$ and $boxed_type$ is the same for bytes fields so we don't need to
+  // do redundant casts.
+  if (GetJavaType(descriptor_) == JAVATYPE_BYTES) {
+    printer->Print(variables_,
+      "        $number$, ($type$) $oneof_name$_);\n");
+  } else {
+    printer->Print(variables_,
+      "        $number$, ($type$)(($boxed_type$) $oneof_name$_));\n");
+  }
+  printer->Print(
     "}\n");
 }
 
@@ -586,22 +616,24 @@ GenerateMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public java.util.List<$boxed_type$>\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return $name$_;\n"   // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
-  if (descriptor_->is_packed() &&
-      context_->HasGeneratedMethods(descriptor_->containing_type())) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "private int $name$MemoizedSerializedSize = -1;\n");
   }
@@ -636,22 +668,25 @@ GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public java.util.List<$boxed_type$>\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return java.util.Collections.unmodifiableList($name$_);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "$null_check$"
     "  ensure$capitalized_name$IsMutable();\n"
@@ -659,18 +694,20 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value) {\n"
     "$null_check$"
     "  ensure$capitalized_name$IsMutable();\n"
     "  $name$_.add(value);\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $boxed_type$> values) {\n"
     "  ensure$capitalized_name$IsMutable();\n"
     "  com.google.protobuf.AbstractMessageLite.Builder.addAll(\n"
@@ -678,14 +715,16 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $name$_ = $empty_list$;\n"
     "  $clear_mutable_bit_builder$;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutablePrimitiveFieldGenerator::
diff --git a/src/google/protobuf/compiler/java/java_primitive_field_lite.cc b/src/google/protobuf/compiler/java/java_primitive_field_lite.cc
index b04bf1c2..d2ebc567 100644
--- a/src/google/protobuf/compiler/java/java_primitive_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_primitive_field_lite.cc
@@ -222,16 +222,20 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
@@ -264,32 +268,38 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutablePrimitiveFieldLiteGenerator::
@@ -297,6 +307,7 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
   // noop for primitives
 }
 
+
 void ImmutablePrimitiveFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
   if (IsByteStringWithCustomDefaultValue(descriptor_)) {
@@ -481,19 +492,23 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    return ($boxed_type$) $oneof_name$_;\n"
     "  }\n"
     "  return $default$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
@@ -519,32 +534,38 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutablePrimitiveOneofFieldLiteGenerator::
@@ -632,22 +653,28 @@ GenerateMembers(io::Printer* printer) const {
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public java.util.List<$boxed_type$>\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return $name$_;\n"   // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return $repeated_get$(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
-  if (descriptor_->options().packed() &&
+  if (descriptor_->is_packed() &&
       context_->HasGeneratedMethods(descriptor_->containing_type())) {
     printer->Print(variables_,
       "private int $name$MemoizedSerializedSize = -1;\n");
@@ -695,51 +722,61 @@ void RepeatedImmutablePrimitiveFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public java.util.List<$boxed_type$>\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return java.util.Collections.unmodifiableList(\n"
     "      instance.get$capitalized_name$List());\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return instance.get$capitalized_name$Count();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public $type$ get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public $type$ ${$get$capitalized_name$$}$(int index) {\n"
     "  return instance.get$capitalized_name$(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, $type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(index, value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$($type$ value) {\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$($type$ value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<? extends $boxed_type$> values) {\n"
     "  copyOnWrite();\n"
     "  instance.addAll$capitalized_name$(values);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutablePrimitiveFieldLiteGenerator::
@@ -747,6 +784,7 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
   // noop for primitives
 }
 
+
 void RepeatedImmutablePrimitiveFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
   printer->Print(variables_, "$name$_ = $empty_list$;\n");
@@ -827,7 +865,7 @@ GenerateParsingDoneCode(io::Printer* printer) const {
 
 void RepeatedImmutablePrimitiveFieldLiteGenerator::
 GenerateSerializationCode(io::Printer* printer) const {
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     // We invoke getSerializedSize in writeTo for messages that have packed
     // fields in ImmutableMessageGenerator::GenerateMessageSerializationMethods.
     // That makes it safe to rely on the memoized size here.
@@ -868,7 +906,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
   printer->Print(
       "size += dataSize;\n");
 
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "if (!get$capitalized_name$List().isEmpty()) {\n"
       "  size += $tag_size$;\n"
@@ -881,7 +919,7 @@ GenerateSerializedSizeCode(io::Printer* printer) const {
   }
 
   // cache the data size for packed fields.
-  if (descriptor_->options().packed()) {
+  if (descriptor_->is_packed()) {
     printer->Print(variables_,
       "$name$MemoizedSerializedSize = dataSize;\n");
   }
diff --git a/src/google/protobuf/compiler/java/java_primitive_field_lite.h b/src/google/protobuf/compiler/java/java_primitive_field_lite.h
index dc59f0cf..93416f0b 100644
--- a/src/google/protobuf/compiler/java/java_primitive_field_lite.h
+++ b/src/google/protobuf/compiler/java/java_primitive_field_lite.h
@@ -80,6 +80,7 @@ class ImmutablePrimitiveFieldLiteGenerator
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  protected:
@@ -110,6 +111,7 @@ class ImmutablePrimitiveOneofFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutablePrimitiveOneofFieldLiteGenerator);
 };
@@ -142,6 +144,7 @@ class RepeatedImmutablePrimitiveFieldLiteGenerator
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  private:
diff --git a/src/google/protobuf/compiler/java/java_shared_code_generator.cc b/src/google/protobuf/compiler/java/java_shared_code_generator.cc
index 7bd5ad7a..0cec20b9 100644
--- a/src/google/protobuf/compiler/java/java_shared_code_generator.cc
+++ b/src/google/protobuf/compiler/java/java_shared_code_generator.cc
@@ -33,16 +33,13 @@
 #include <google/protobuf/compiler/java/java_shared_code_generator.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/java/java_helpers.h>
 #include <google/protobuf/compiler/java/java_name_resolver.h>
 #include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/stubs/strutil.h>
 
@@ -69,11 +66,11 @@ void SharedCodeGenerator::Generate(GeneratorContext* context,
     string classname = name_resolver_->GetDescriptorClassName(file_);
     string filename = package_dir + classname + ".java";
     file_list->push_back(filename);
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
+    std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
     GeneratedCodeInfo annotations;
     io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
         &annotations);
-    google::protobuf::scoped_ptr<io::Printer> printer(
+    std::unique_ptr<io::Printer> printer(
         new io::Printer(output.get(), '$',
                         options_.annotate_code ? &annotation_collector : NULL));
     string info_relative_path = classname + ".java.pb.meta";
@@ -108,7 +105,7 @@ void SharedCodeGenerator::Generate(GeneratorContext* context,
       "}\n");
 
     if (options_.annotate_code) {
-      google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> info_output(
+      std::unique_ptr<io::ZeroCopyOutputStream> info_output(
           context->Open(info_full_path));
       annotations.SerializeToZeroCopyStream(info_output.get());
       annotation_file_list->push_back(info_full_path);
@@ -140,13 +137,16 @@ void SharedCodeGenerator::GenerateDescriptors(io::Printer* printer) {
     "java.lang.String[] descriptorData = {\n");
   printer->Indent();
 
-  // Only write 40 bytes per line.
+  // Limit the number of bytes per line.
   static const int kBytesPerLine = 40;
+  // Limit the number of lines per string part.
+  static const int kLinesPerPart = 400;
+  // Every block of bytes, start a new string literal, in order to avoid the
+  // 64k length limit. Note that this value needs to be <64k.
+  static const int kBytesPerPart = kBytesPerLine * kLinesPerPart;
   for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
     if (i > 0) {
-      // Every 400 lines, start a new string literal, in order to avoid the
-      // 64k length limit.
-      if (i % 400 == 0) {
+      if (i % kBytesPerPart == 0) {
         printer->Print(",\n");
       } else {
         printer->Print(" +\n");
@@ -182,10 +182,16 @@ void SharedCodeGenerator::GenerateDescriptors(io::Printer* printer) {
   std::vector<std::pair<string, string> > dependencies;
   for (int i = 0; i < file_->dependency_count(); i++) {
     string filename = file_->dependency(i)->name();
-    string classname = FileJavaPackage(file_->dependency(i)) + "." +
-                       name_resolver_->GetDescriptorClassName(
-                           file_->dependency(i));
-    dependencies.push_back(std::make_pair(filename, classname));
+    string package = FileJavaPackage(file_->dependency(i));
+    string classname = name_resolver_->GetDescriptorClassName(
+        file_->dependency(i));
+    string full_name;
+    if (package.empty()) {
+      full_name = classname;
+    } else {
+      full_name = package + "." + classname;
+    }
+    dependencies.push_back(std::make_pair(filename, full_name));
   }
 
   // -----------------------------------------------------------------
diff --git a/src/google/protobuf/compiler/java/java_shared_code_generator.h b/src/google/protobuf/compiler/java/java_shared_code_generator.h
index 40502270..58a31f5d 100644
--- a/src/google/protobuf/compiler/java/java_shared_code_generator.h
+++ b/src/google/protobuf/compiler/java/java_shared_code_generator.h
@@ -36,9 +36,6 @@
 #define GOOGLE_PROTOBUF_COMPILER_JAVA_SHARED_CODE_GENERATOR_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 
@@ -77,7 +74,7 @@ class SharedCodeGenerator {
   void GenerateDescriptors(io::Printer* printer);
 
  private:
-  google::protobuf::scoped_ptr<ClassNameResolver> name_resolver_;
+  std::unique_ptr<ClassNameResolver> name_resolver_;
   const FileDescriptor* file_;
   const Options options_;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(SharedCodeGenerator);
diff --git a/src/google/protobuf/compiler/java/java_string_field.cc b/src/google/protobuf/compiler/java/java_string_field.cc
index 5c2900ce..2b6e9381 100644
--- a/src/google/protobuf/compiler/java/java_string_field.cc
+++ b/src/google/protobuf/compiler/java/java_string_field.cc
@@ -217,14 +217,15 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  java.lang.Object ref = $name$_;\n"
     "  if (ref instanceof java.lang.String) {\n"
     "    return (java.lang.String) ref;\n"
@@ -232,6 +233,7 @@ GenerateMembers(io::Printer* printer) const {
     "    com.google.protobuf.ByteString bs = \n"
     "        (com.google.protobuf.ByteString) ref;\n"
       "    java.lang.String s = bs.toStringUtf8();\n");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "    $name$_ = s;\n");
@@ -248,7 +250,7 @@ GenerateMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  java.lang.Object ref = $name$_;\n"
     "  if (ref instanceof java.lang.String) {\n"
     "    com.google.protobuf.ByteString b = \n"
@@ -260,6 +262,7 @@ GenerateMembers(io::Printer* printer) const {
     "    return (com.google.protobuf.ByteString) ref;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableStringFieldGenerator::
@@ -269,19 +272,21 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_builder$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  java.lang.Object ref = $name$_;\n"
     "  if (!(ref instanceof java.lang.String)) {\n"
     "    com.google.protobuf.ByteString bs =\n"
     "        (com.google.protobuf.ByteString) ref;\n"
     "    java.lang.String s = bs.toStringUtf8();\n");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "    $name$_ = s;\n");
@@ -301,7 +306,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  java.lang.Object ref = $name$_;\n"
     "  if (ref instanceof String) {\n"
     "    com.google.protobuf.ByteString b = \n"
@@ -313,10 +318,11 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "    return (com.google.protobuf.ByteString) ref;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "$null_check$"
     "  $set_has_field_bit_builder$\n"
@@ -324,10 +330,12 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $clear_has_field_bit_builder$\n");
+  printer->Annotate("{", "}", descriptor_);
   // The default value is not a simple literal so we want to avoid executing
   // it multiple times.  Instead, get the default out of the default instance.
   printer->Print(variables_,
@@ -339,9 +347,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "$null_check$");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "  checkByteStringIsUtf8(value);\n");
@@ -482,14 +491,15 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public boolean has$capitalized_name$() {\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
     "  return $has_oneof_case_message$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  java.lang.Object ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = $oneof_name$_;\n"
@@ -500,6 +510,7 @@ GenerateMembers(io::Printer* printer) const {
     "    com.google.protobuf.ByteString bs = \n"
     "        (com.google.protobuf.ByteString) ref;\n"
     "    java.lang.String s = bs.toStringUtf8();\n");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
     "    if ($has_oneof_case_message$) {\n"
@@ -519,7 +530,7 @@ GenerateMembers(io::Printer* printer) const {
 
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  java.lang.Object ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = $oneof_name$_;\n"
@@ -536,6 +547,7 @@ GenerateMembers(io::Printer* printer) const {
     "    return (com.google.protobuf.ByteString) ref;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableStringOneofFieldGenerator::
@@ -543,14 +555,15 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $has_oneof_case_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  java.lang.Object ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = $oneof_name$_;\n"
@@ -560,6 +573,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "        (com.google.protobuf.ByteString) ref;\n"
     "    java.lang.String s = bs.toStringUtf8();\n"
     "    if ($has_oneof_case_message$) {\n");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "      $oneof_name$_ = s;\n");
@@ -580,7 +594,7 @@ GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  java.lang.Object ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = $oneof_name$_;\n"
@@ -597,10 +611,11 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "    return (com.google.protobuf.ByteString) ref;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "$null_check$"
     "  $set_oneof_case_message$;\n"
@@ -608,9 +623,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    $clear_oneof_case_message$;\n"
     "    $oneof_name$_ = null;\n"
@@ -618,12 +634,14 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  }\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "$null_check$");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "  checkByteStringIsUtf8(value);\n");
@@ -744,25 +762,30 @@ GenerateMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ProtocolStringList\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return $name$_;\n"   // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$(int index) {\n"
+    "$deprecation$public java.lang.String "
+    "${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes(int index) {\n"
+    "    ${$get$capitalized_name$Bytes$}$(int index) {\n"
     "  return $name$_.getByteString(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutableStringFieldGenerator::
@@ -794,28 +817,33 @@ GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ProtocolStringList\n"
-    "    get$capitalized_name$List() {\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return $name$_.getUnmodifiableView();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$(int index) {\n"
+    "$deprecation$public java.lang.String "
+    "${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes(int index) {\n"
+    "    ${$get$capitalized_name$Bytes$}$(int index) {\n"
     "  return $name$_.getByteString(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, java.lang.String value) {\n"
     "$null_check$"
     "  ensure$capitalized_name$IsMutable();\n"
@@ -823,9 +851,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "$null_check$"
     "  ensure$capitalized_name$IsMutable();\n"
@@ -833,9 +862,10 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<java.lang.String> values) {\n"
     "  ensure$capitalized_name$IsMutable();\n"
     "  com.google.protobuf.AbstractMessageLite.Builder.addAll(\n"
@@ -843,20 +873,23 @@ GenerateBuilderMembers(io::Printer* printer) const {
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  $name$_ = $empty_list$;\n"
     "  $clear_mutable_bit_builder$;\n"
     "  $on_changed$\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "$null_check$");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "  checkByteStringIsUtf8(value);\n");
diff --git a/src/google/protobuf/compiler/java/java_string_field_lite.cc b/src/google/protobuf/compiler/java/java_string_field_lite.cc
index 138e59b6..a238c67d 100644
--- a/src/google/protobuf/compiler/java/java_string_field_lite.cc
+++ b/src/google/protobuf/compiler/java/java_string_field_lite.cc
@@ -71,7 +71,7 @@ void SetPrimitiveVariables(const FieldDescriptor* descriptor,
   (*variables)["default"] = ImmutableDefaultValue(descriptor, name_resolver);
   (*variables)["default_init"] =
       "= " + ImmutableDefaultValue(descriptor, name_resolver);
-  (*variables)["capitalized_type"] = "String";
+  (*variables)["capitalized_type"] = "java.lang.String";
   (*variables)["tag"] =
       SimpleItoa(static_cast<int32>(WireFormat::MakeTag(descriptor)));
   (*variables)["tag_size"] = SimpleItoa(
@@ -192,22 +192,28 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return $get_has_field_bit_message$;\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  return $name$_;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  return com.google.protobuf.ByteString.copyFromUtf8($name$_);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
@@ -246,48 +252,57 @@ GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  return instance.get$capitalized_name$Bytes();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$Bytes(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableStringFieldLiteGenerator::
@@ -295,6 +310,7 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
   // noop for strings
 }
 
+
 void ImmutableStringFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
   printer->Print(variables_, "$name$_ = $default$;\n");
@@ -323,7 +339,7 @@ void ImmutableStringFieldLiteGenerator::
 GenerateParsingCode(io::Printer* printer) const {
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
-      "String s = input.readStringRequireUtf8();\n"
+      "java.lang.String s = input.readStringRequireUtf8();\n"
       "$set_has_field_bit_message$\n"
       "$name$_ = s;\n");
   } else {
@@ -332,7 +348,7 @@ GenerateParsingCode(io::Printer* printer) const {
     // spurious intermediary ByteString allocations, cutting overall allocations
     // in half.
     printer->Print(variables_,
-      "String s = input.readString();\n"
+      "java.lang.String s = input.readString();\n"
       "$set_has_field_bit_message$\n"
       "$name$_ = s;\n");
   }
@@ -409,54 +425,63 @@ GenerateMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public boolean has$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
     "  return $has_oneof_case_message$;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  java.lang.String ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = (java.lang.String) $oneof_name$_;\n"
     "  }\n"
     "  return ref;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
 
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  java.lang.String ref $default_init$;\n"
     "  if ($has_oneof_case_message$) {\n"
     "    ref = (java.lang.String) $oneof_name$_;\n"
     "  }\n"
     "  return com.google.protobuf.ByteString.copyFromUtf8(ref);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "private void set$capitalized_name$(\n"
+    "private void ${$set$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "$null_check$"
     "  $set_oneof_case_message$;\n"
     "  $oneof_name$_ = value;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "private void clear$capitalized_name$() {\n"
+    "private void ${$clear$capitalized_name$$}$() {\n"
     "  if ($has_oneof_case_message$) {\n"
     "    $clear_oneof_case_message$;\n"
     "    $oneof_name$_ = null;\n"
     "  }\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "private void set$capitalized_name$Bytes(\n"
+    "private void ${$set$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "$null_check$");
+  printer->Annotate("{", "}", descriptor_);
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
       "  checkByteStringIsUtf8(value);\n");
@@ -467,53 +492,63 @@ GenerateMembers(io::Printer* printer) const {
     "}\n");
 }
 
+
 void ImmutableStringOneofFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   if (SupportFieldPresence(descriptor_->file())) {
     WriteFieldDocComment(printer, descriptor_);
     printer->Print(variables_,
-      "$deprecation$public boolean has$capitalized_name$() {\n"
+      "@java.lang.Override\n"
+      "$deprecation$public boolean ${$has$capitalized_name$$}$() {\n"
       "  return instance.has$capitalized_name$();\n"
       "}\n");
+    printer->Annotate("{", "}", descriptor_);
   }
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String ${$get$capitalized_name$$}$() {\n"
     "  return instance.get$capitalized_name$();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes() {\n"
+    "    ${$get$capitalized_name$Bytes$}$() {\n"
     "  return instance.get$capitalized_name$Bytes();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$Bytes(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void ImmutableStringOneofFieldLiteGenerator::
@@ -527,7 +562,7 @@ void ImmutableStringOneofFieldLiteGenerator::
 GenerateParsingCode(io::Printer* printer) const {
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
-      "String s = input.readStringRequireUtf8();\n"
+      "java.lang.String s = input.readStringRequireUtf8();\n"
       "$set_oneof_case_message$;\n"
       "$oneof_name$_ = s;\n");
   } else {
@@ -536,7 +571,7 @@ GenerateParsingCode(io::Printer* printer) const {
     // spurious intermediary ByteString allocations, cutting overall allocations
     // in half.
     printer->Print(variables_,
-      "String s = input.readString();\n"
+      "java.lang.String s = input.readString();\n"
       "$set_oneof_case_message$;\n"
       "$oneof_name$_ = s;\n");
   }
@@ -595,7 +630,7 @@ void RepeatedImmutableStringFieldLiteGenerator::
 GenerateInterfaceMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$java.util.List<String>\n"
+    "$deprecation$java.util.List<java.lang.String>\n"
     "    get$capitalized_name$List();\n");
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
@@ -613,30 +648,41 @@ GenerateInterfaceMembers(io::Printer* printer) const {
 void RepeatedImmutableStringFieldLiteGenerator::
 GenerateMembers(io::Printer* printer) const {
   printer->Print(variables_,
-    "private com.google.protobuf.Internal.ProtobufList<String> $name$_;\n");
+    "private com.google.protobuf.Internal.ProtobufList<java.lang.String> "
+    "$name$_;\n");
   PrintExtraFieldInfo(variables_, printer);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<String> get$capitalized_name$List() {\n"
-    "  return $name$_;\n"   // note:  unmodifiable list
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<java.lang.String> "
+    "${$get$capitalized_name$List$}$() {\n"
+    "  return $name$_;\n"  // note:  unmodifiable list
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return $name$_.size();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String "
+    "${$get$capitalized_name$$}$(int index) {\n"
     "  return $name$_.get(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes(int index) {\n"
+    "    ${$get$capitalized_name$Bytes$}$(int index) {\n"
     "  return com.google.protobuf.ByteString.copyFromUtf8(\n"
     "      $name$_.get(index));\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   printer->Print(variables_,
     "private void ensure$capitalized_name$IsMutable() {\n"
@@ -695,67 +741,81 @@ void RepeatedImmutableStringFieldLiteGenerator::
 GenerateBuilderMembers(io::Printer* printer) const {
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.util.List<String>\n"
-    "    get$capitalized_name$List() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.util.List<java.lang.String>\n"
+    "    ${$get$capitalized_name$List$}$() {\n"
     "  return java.util.Collections.unmodifiableList(\n"
     "      instance.get$capitalized_name$List());\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public int get$capitalized_name$Count() {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public int ${$get$capitalized_name$Count$}$() {\n"
     "  return instance.get$capitalized_name$Count();\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public java.lang.String get$capitalized_name$(int index) {\n"
+    "@java.lang.Override\n"
+    "$deprecation$public java.lang.String "
+    "${$get$capitalized_name$$}$(int index) {\n"
     "  return instance.get$capitalized_name$(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
+    "@java.lang.Override\n"
     "$deprecation$public com.google.protobuf.ByteString\n"
-    "    get$capitalized_name$Bytes(int index) {\n"
+    "    ${$get$capitalized_name$Bytes$}$(int index) {\n"
     "  return instance.get$capitalized_name$Bytes(index);\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder set$capitalized_name$(\n"
+    "$deprecation$public Builder ${$set$capitalized_name$$}$(\n"
     "    int index, java.lang.String value) {\n"
     "  copyOnWrite();\n"
     "  instance.set$capitalized_name$(index, value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$$}$(\n"
     "    java.lang.String value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder addAll$capitalized_name$(\n"
+    "$deprecation$public Builder ${$addAll$capitalized_name$$}$(\n"
     "    java.lang.Iterable<java.lang.String> values) {\n"
     "  copyOnWrite();\n"
     "  instance.addAll$capitalized_name$(values);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder clear$capitalized_name$() {\n"
+    "$deprecation$public Builder ${$clear$capitalized_name$$}$() {\n"
     "  copyOnWrite();\n"
     "  instance.clear$capitalized_name$();\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 
   WriteFieldDocComment(printer, descriptor_);
   printer->Print(variables_,
-    "$deprecation$public Builder add$capitalized_name$Bytes(\n"
+    "$deprecation$public Builder ${$add$capitalized_name$Bytes$}$(\n"
     "    com.google.protobuf.ByteString value) {\n"
     "  copyOnWrite();\n"
     "  instance.add$capitalized_name$Bytes(value);\n"
     "  return this;\n"
     "}\n");
+  printer->Annotate("{", "}", descriptor_);
 }
 
 void RepeatedImmutableStringFieldLiteGenerator::
@@ -763,6 +823,7 @@ GenerateFieldBuilderInitializationCode(io::Printer* printer)  const {
   // noop for strings
 }
 
+
 void RepeatedImmutableStringFieldLiteGenerator::
 GenerateInitializationCode(io::Printer* printer) const {
   printer->Print(variables_, "$name$_ = $empty_list$;\n");
@@ -784,14 +845,14 @@ void RepeatedImmutableStringFieldLiteGenerator::
 GenerateParsingCode(io::Printer* printer) const {
   if (CheckUtf8(descriptor_)) {
     printer->Print(variables_,
-    "String s = input.readStringRequireUtf8();\n");
+      "java.lang.String s = input.readStringRequireUtf8();\n");
   } else {
     // Lite runtime should attempt to reduce allocations by attempting to
     // construct the string directly from the input stream buffer. This avoids
     // spurious intermediary ByteString allocations, cutting overall allocations
     // in half.
     printer->Print(variables_,
-    "String s = input.readString();\n");
+      "java.lang.String s = input.readString();\n");
   }
   printer->Print(variables_,
     "if (!$is_mutable$) {\n"
@@ -865,7 +926,7 @@ GenerateHashCode(io::Printer* printer) const {
 }
 
 string RepeatedImmutableStringFieldLiteGenerator::GetBoxedType() const {
-  return "String";
+  return "java.lang.String";
 }
 
 }  // namespace java
diff --git a/src/google/protobuf/compiler/java/java_string_field_lite.h b/src/google/protobuf/compiler/java/java_string_field_lite.h
index 80496c87..b7fb6409 100644
--- a/src/google/protobuf/compiler/java/java_string_field_lite.h
+++ b/src/google/protobuf/compiler/java/java_string_field_lite.h
@@ -78,6 +78,7 @@ class ImmutableStringFieldLiteGenerator : public ImmutableFieldLiteGenerator {
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  protected:
@@ -108,6 +109,7 @@ class ImmutableStringOneofFieldLiteGenerator
   void GenerateSerializationCode(io::Printer* printer) const;
   void GenerateSerializedSizeCode(io::Printer* printer) const;
 
+
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImmutableStringOneofFieldLiteGenerator);
 };
 
@@ -136,6 +138,7 @@ class RepeatedImmutableStringFieldLiteGenerator
   void GenerateEqualsCode(io::Printer* printer) const;
   void GenerateHashCode(io::Printer* printer) const;
 
+
   string GetBoxedType() const;
 
  private:
diff --git a/src/google/protobuf/compiler/javanano/javanano_enum.cc b/src/google/protobuf/compiler/javanano/javanano_enum.cc
deleted file mode 100644
index c6e8dfe9..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_enum.cc
+++ /dev/null
@@ -1,143 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <map>
-#include <string>
-
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/compiler/javanano/javanano_enum.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-EnumGenerator::EnumGenerator(const EnumDescriptor* descriptor, const Params& params)
-  : params_(params), descriptor_(descriptor) {
-  for (int i = 0; i < descriptor_->value_count(); i++) {
-    const EnumValueDescriptor* value = descriptor_->value(i);
-    const EnumValueDescriptor* canonical_value =
-      descriptor_->FindValueByNumber(value->number());
-
-    if (value == canonical_value) {
-      canonical_values_.push_back(value);
-    } else {
-      Alias alias;
-      alias.value = value;
-      alias.canonical_value = canonical_value;
-      aliases_.push_back(alias);
-    }
-  }
-}
-
-EnumGenerator::~EnumGenerator() {}
-
-void EnumGenerator::Generate(io::Printer* printer) {
-  printer->Print(
-      "\n"
-      "// enum $classname$\n",
-      "classname", descriptor_->name());
-
-  const string classname = RenameJavaKeywords(descriptor_->name());
-
-  // Start of container interface
-  // If generating intdefs, we use the container interface as the intdef if
-  // present. Otherwise, we just make an empty @interface parallel to the
-  // constants.
-  bool use_intdef = params_.generate_intdefs();
-  bool use_shell_class = params_.java_enum_style();
-  if (use_intdef) {
-    // @IntDef annotation so tools can enforce correctness
-    // Annotations will be discarded by the compiler
-    printer->Print("@java.lang.annotation.Retention("
-      "java.lang.annotation.RetentionPolicy.SOURCE)\n"
-      "@android.support.annotation.IntDef({\n");
-    printer->Indent();
-    for (int i = 0; i < canonical_values_.size(); i++) {
-      const string constant_name =
-          RenameJavaKeywords(canonical_values_[i]->name());
-      if (use_shell_class) {
-        printer->Print("$classname$.$name$,\n",
-          "classname", classname,
-          "name", constant_name);
-      } else {
-        printer->Print("$name$,\n", "name", constant_name);
-      }
-    }
-    printer->Outdent();
-    printer->Print("})\n");
-  }
-  if (use_shell_class || use_intdef) {
-    printer->Print(
-      "public $at_for_intdef$interface $classname$ {\n",
-      "classname", classname,
-      "at_for_intdef", use_intdef ? "@" : "");
-    if (use_shell_class) {
-        printer->Indent();
-    } else {
-        printer->Print("}\n\n");
-    }
-  }
-
-  // Canonical values
-  for (int i = 0; i < canonical_values_.size(); i++) {
-    printer->Print(
-      "public static final int $name$ = $canonical_value$;\n",
-      "name", RenameJavaKeywords(canonical_values_[i]->name()),
-      "canonical_value", SimpleItoa(canonical_values_[i]->number()));
-  }
-
-  // Aliases
-  for (int i = 0; i < aliases_.size(); i++) {
-    printer->Print(
-      "public static final int $name$ = $canonical_name$;\n",
-      "name", RenameJavaKeywords(aliases_[i].value->name()),
-      "canonical_name", RenameJavaKeywords(aliases_[i].canonical_value->name()));
-  }
-
-  // End of container interface
-  if (use_shell_class) {
-    printer->Outdent();
-    printer->Print("}\n");
-  }
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_enum_field.cc b/src/google/protobuf/compiler/javanano/javanano_enum_field.cc
deleted file mode 100644
index 7666db38..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_enum_field.cc
+++ /dev/null
@@ -1,544 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <map>
-#include <string>
-
-#include <google/protobuf/compiler/javanano/javanano_enum_field.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-namespace {
-
-// TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
-//   repeat code between this and the other field types.
-void SetEnumVariables(const Params& params,
-    const FieldDescriptor* descriptor, map<string, string>* variables) {
-  (*variables)["name"] =
-    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  (*variables)["capitalized_name"] =
-    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
-  (*variables)["number"] = SimpleItoa(descriptor->number());
-  if (params.use_reference_types_for_primitives()
-      && !params.reftypes_primitive_enums()
-      && !descriptor->is_repeated()) {
-    (*variables)["type"] = "java.lang.Integer";
-    (*variables)["default"] = "null";
-  } else {
-    (*variables)["type"] = "int";
-    (*variables)["default"] = DefaultValue(params, descriptor);
-  }
-  (*variables)["repeated_default"] =
-      "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
-  (*variables)["tag"] = SimpleItoa(internal::WireFormat::MakeTag(descriptor));
-  (*variables)["tag_size"] = SimpleItoa(
-      internal::WireFormat::TagSize(descriptor->number(), descriptor->type()));
-  (*variables)["non_packed_tag"] = SimpleItoa(
-      internal::WireFormatLite::MakeTag(descriptor->number(),
-          internal::WireFormat::WireTypeForFieldType(descriptor->type())));
-  (*variables)["message_name"] = descriptor->containing_type()->name();
-  const EnumDescriptor* enum_type = descriptor->enum_type();
-  (*variables)["message_type_intdef"] = "@"
-      + ToJavaName(params, enum_type->name(), true,
-          enum_type->containing_type(), enum_type->file());
-}
-
-void LoadEnumValues(const Params& params,
-    const EnumDescriptor* enum_descriptor, vector<string>* canonical_values) {
-  string enum_class_name = ClassName(params, enum_descriptor);
-  for (int i = 0; i < enum_descriptor->value_count(); i++) {
-    const EnumValueDescriptor* value = enum_descriptor->value(i);
-    const EnumValueDescriptor* canonical_value =
-        enum_descriptor->FindValueByNumber(value->number());
-    if (value == canonical_value) {
-      canonical_values->push_back(
-          enum_class_name + "." + RenameJavaKeywords(value->name()));
-    }
-  }
-}
-
-void PrintCaseLabels(
-    io::Printer* printer, const vector<string>& canonical_values) {
-  for (int i = 0; i < canonical_values.size(); i++) {
-    printer->Print(
-      "  case $value$:\n",
-      "value", canonical_values[i]);
-  }
-}
-
-}  // namespace
-
-// ===================================================================
-
-EnumFieldGenerator::
-EnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetEnumVariables(params, descriptor, &variables_);
-  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
-}
-
-EnumFieldGenerator::~EnumFieldGenerator() {}
-
-void EnumFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  if (params_.generate_intdefs()) {
-    printer->Print(variables_, "$message_type_intdef$\n");
-  }
-  printer->Print(variables_, "public $type$ $name$;\n");
-
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "public boolean has$capitalized_name$;\n");
-  }
-}
-
-void EnumFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = $default$;\n");
-
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "has$capitalized_name$ = false;\n");
-  }
-}
-
-void EnumFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "int value = input.readInt32();\n"
-    "switch (value) {\n");
-  PrintCaseLabels(printer, canonical_values_);
-  printer->Print(variables_,
-    "    this.$name$ = value;\n");
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "    has$capitalized_name$ = true;\n");
-  }
-  printer->Print(
-    "    break;\n"
-    "}\n");
-  // No default case: in case of invalid value from the wire, preserve old
-  // field value. Also we are not storing the invalid value into the unknown
-  // fields, because there is no way to get the value out.
-}
-
-void EnumFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  if (descriptor_->is_required() && !params_.generate_has()) {
-    // Always serialize a required field if we don't have the 'has' signal.
-    printer->Print(variables_,
-      "output.writeInt32($number$, this.$name$);\n");
-  } else {
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
-    } else {
-      printer->Print(variables_,
-        "if (this.$name$ != $default$) {\n");
-    }
-    printer->Print(variables_,
-      "  output.writeInt32($number$, this.$name$);\n"
-      "}\n");
-  }
-}
-
-void EnumFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  if (descriptor_->is_required() && !params_.generate_has()) {
-    printer->Print(variables_,
-      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "  .computeInt32Size($number$, this.$name$);\n");
-  } else {
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "if (this.$name$ != $default$ || has$capitalized_name$) {\n");
-    } else {
-      printer->Print(variables_,
-        "if (this.$name$ != $default$) {\n");
-    }
-    printer->Print(variables_,
-      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "    .computeInt32Size($number$, this.$name$);\n"
-      "}\n");
-  }
-}
-
-void EnumFieldGenerator::GenerateEqualsCode(io::Printer* printer) const {
-  if (params_.use_reference_types_for_primitives()
-        && !params_.reftypes_primitive_enums()) {
-    printer->Print(variables_,
-      "if (this.$name$ == null) {\n"
-      "  if (other.$name$ != null) {\n"
-      "    return false;\n"
-      "  }\n"
-      "} else if (!this.$name$.equals(other.$name$)) {\n"
-      "  return false;"
-      "}\n");
-  } else {
-    // We define equality as serialized form equality. If generate_has(),
-    // then if the field value equals the default value in both messages,
-    // but one's 'has' field is set and the other's is not, the serialized
-    // forms are different and we should return false.
-    printer->Print(variables_,
-      "if (this.$name$ != other.$name$");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "    || (this.$name$ == $default$\n"
-        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "  return false;\n"
-      "}\n");
-  }
-}
-
-void EnumFieldGenerator::GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(
-    "result = 31 * result + ");
-  if (params_.use_reference_types_for_primitives()
-        && !params_.reftypes_primitive_enums()) {
-    printer->Print(variables_,
-      "(this.$name$ == null ? 0 : this.$name$)");
-  } else {
-    printer->Print(variables_,
-      "this.$name$");
-  }
-  printer->Print(";\n");
-}
-
-// ===================================================================
-
-AccessorEnumFieldGenerator::
-AccessorEnumFieldGenerator(const FieldDescriptor* descriptor,
-    const Params& params, int has_bit_index)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetEnumVariables(params, descriptor, &variables_);
-  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
-  SetBitOperationVariables("has", has_bit_index, &variables_);
-}
-
-AccessorEnumFieldGenerator::~AccessorEnumFieldGenerator() {}
-
-void AccessorEnumFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_, "private int $name$_;\n");
-  if (params_.generate_intdefs()) {
-    printer->Print(variables_, "$message_type_intdef$\n");
-  }
-  printer->Print(variables_,
-    "public int get$capitalized_name$() {\n"
-    "  return $name$_;\n"
-    "}\n"
-    "public $message_name$ set$capitalized_name$(");
-  if (params_.generate_intdefs()) {
-    printer->Print(variables_,
-      "\n"
-      "    $message_type_intdef$ ");
-  }
-  printer->Print(variables_,
-    "int value) {\n"
-    "  $name$_ = value;\n"
-    "  $set_has$;\n"
-    "  return this;\n"
-    "}\n"
-    "public boolean has$capitalized_name$() {\n"
-    "  return $get_has$;\n"
-    "}\n"
-    "public $message_name$ clear$capitalized_name$() {\n"
-    "  $name$_ = $default$;\n"
-    "  $clear_has$;\n"
-    "  return this;\n"
-    "}\n");
-}
-
-void AccessorEnumFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$_ = $default$;\n");
-}
-
-void AccessorEnumFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "int value = input.readInt32();\n"
-    "switch (value) {\n");
-  PrintCaseLabels(printer, canonical_values_);
-  printer->Print(variables_,
-    "    $name$_ = value;\n"
-    "    $set_has$;\n"
-    "    break;\n"
-    "}\n");
-  // No default case: in case of invalid value from the wire, preserve old
-  // field value. Also we are not storing the invalid value into the unknown
-  // fields, because there is no way to get the value out.
-}
-
-void AccessorEnumFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($get_has$) {\n"
-    "  output.writeInt32($number$, $name$_);\n"
-    "}\n");
-}
-
-void AccessorEnumFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($get_has$) {\n"
-    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "    .computeInt32Size($number$, $name$_);\n"
-    "}\n");
-}
-
-void AccessorEnumFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($different_has$\n"
-    "    || $name$_ != other.$name$_) {\n"
-    "  return false;\n"
-    "}\n");
-}
-
-void AccessorEnumFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result + $name$_;\n");
-}
-
-// ===================================================================
-
-RepeatedEnumFieldGenerator::
-RepeatedEnumFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetEnumVariables(params, descriptor, &variables_);
-  LoadEnumValues(params, descriptor->enum_type(), &canonical_values_);
-}
-
-RepeatedEnumFieldGenerator::~RepeatedEnumFieldGenerator() {}
-
-void RepeatedEnumFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_,
-    "public $type$[] $name$;\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = $repeated_default$;\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  // First, figure out the maximum length of the array, then parse,
-  // and finally copy the valid values to the field.
-  printer->Print(variables_,
-    "int length = com.google.protobuf.nano.WireFormatNano\n"
-    "    .getRepeatedFieldArrayLength(input, $non_packed_tag$);\n"
-    "int[] validValues = new int[length];\n"
-    "int validCount = 0;\n"
-    "for (int i = 0; i < length; i++) {\n"
-    "  if (i != 0) { // tag for first value already consumed.\n"
-    "    input.readTag();\n"
-    "  }\n"
-    "  int value = input.readInt32();\n"
-    "  switch (value) {\n");
-  printer->Indent();
-  PrintCaseLabels(printer, canonical_values_);
-  printer->Outdent();
-  printer->Print(variables_,
-    "      validValues[validCount++] = value;\n"
-    "      break;\n"
-    "  }\n"
-    "}\n"
-    "if (validCount != 0) {\n"
-    "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
-    "  if (i == 0 && validCount == validValues.length) {\n"
-    "    this.$name$ = validValues;\n"
-    "  } else {\n"
-    "    int[] newArray = new int[i + validCount];\n"
-    "    if (i != 0) {\n"
-    "      java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
-    "    }\n"
-    "    java.lang.System.arraycopy(validValues, 0, newArray, i, validCount);\n"
-    "    this.$name$ = newArray;\n"
-    "  }\n"
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateMergingCodeFromPacked(io::Printer* printer) const {
-  printer->Print(variables_,
-    "int bytes = input.readRawVarint32();\n"
-    "int limit = input.pushLimit(bytes);\n"
-    "// First pass to compute array length.\n"
-    "int arrayLength = 0;\n"
-    "int startPos = input.getPosition();\n"
-    "while (input.getBytesUntilLimit() > 0) {\n"
-    "  switch (input.readInt32()) {\n");
-  printer->Indent();
-  PrintCaseLabels(printer, canonical_values_);
-  printer->Outdent();
-  printer->Print(variables_,
-    "      arrayLength++;\n"
-    "      break;\n"
-    "  }\n"
-    "}\n"
-    "if (arrayLength != 0) {\n"
-    "  input.rewindToPosition(startPos);\n"
-    "  int i = this.$name$ == null ? 0 : this.$name$.length;\n"
-    "  int[] newArray = new int[i + arrayLength];\n"
-    "  if (i != 0) {\n"
-    "    java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
-    "  }\n"
-    "  while (input.getBytesUntilLimit() > 0) {\n"
-    "    int value = input.readInt32();\n"
-    "    switch (value) {\n");
-  printer->Indent();
-  printer->Indent();
-  PrintCaseLabels(printer, canonical_values_);
-  printer->Outdent();
-  printer->Outdent();
-  printer->Print(variables_,
-    "        newArray[i++] = value;\n"
-    "        break;\n"
-    "    }\n"
-    "  }\n"
-    "  this.$name$ = newArray;\n"
-    "}\n"
-    "input.popLimit(limit);\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateRepeatedDataSizeCode(io::Printer* printer) const {
-  // Creates a variable dataSize and puts the serialized size in there.
-  printer->Print(variables_,
-    "int dataSize = 0;\n"
-    "for (int i = 0; i < this.$name$.length; i++) {\n"
-    "  int element = this.$name$[i];\n"
-    "  dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "      .computeInt32SizeNoTag(element);\n"
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n");
-  printer->Indent();
-
-  if (descriptor_->options().packed()) {
-    GenerateRepeatedDataSizeCode(printer);
-    printer->Print(variables_,
-      "output.writeRawVarint32($tag$);\n"
-      "output.writeRawVarint32(dataSize);\n"
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  output.writeRawVarint32(this.$name$[i]);\n"
-      "}\n");
-  } else {
-    printer->Print(variables_,
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  output.writeInt32($number$, this.$name$[i]);\n"
-      "}\n");
-  }
-
-  printer->Outdent();
-  printer->Print(variables_,
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n");
-  printer->Indent();
-
-  GenerateRepeatedDataSizeCode(printer);
-
-  printer->Print(
-    "size += dataSize;\n");
-  if (descriptor_->options().packed()) {
-    printer->Print(variables_,
-      "size += $tag_size$;\n"
-      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "    .computeRawVarint32Size(dataSize);\n");
-  } else {
-    printer->Print(variables_,
-      "size += $tag_size$ * this.$name$.length;\n");
-  }
-
-  printer->Outdent();
-
-  printer->Print(
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateFixClonedCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n"
-    "  cloned.$name$ = this.$name$.clone();\n"
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
-    "    this.$name$, other.$name$)) {\n"
-    "  return false;\n"
-    "}\n");
-}
-
-void RepeatedEnumFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result\n"
-    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_enum_field.h b/src/google/protobuf/compiler/javanano/javanano_enum_field.h
deleted file mode 100644
index b94790d6..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_enum_field.h
+++ /dev/null
@@ -1,126 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__
-
-#include <map>
-#include <string>
-#include <vector>
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class EnumFieldGenerator : public FieldGenerator {
- public:
-  explicit EnumFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~EnumFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-  vector<string> canonical_values_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumFieldGenerator);
-};
-
-class AccessorEnumFieldGenerator : public FieldGenerator {
- public:
-  explicit AccessorEnumFieldGenerator(const FieldDescriptor* descriptor,
-      const Params& params, int has_bit_index);
-  ~AccessorEnumFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-  vector<string> canonical_values_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(AccessorEnumFieldGenerator);
-};
-
-class RepeatedEnumFieldGenerator : public FieldGenerator {
- public:
-  explicit RepeatedEnumFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~RepeatedEnumFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateMergingCodeFromPacked(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-  void GenerateFixClonedCode(io::Printer* printer) const;
-
- private:
-  void GenerateRepeatedDataSizeCode(io::Printer* printer) const;
-
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-  vector<string> canonical_values_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedEnumFieldGenerator);
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_FIELD_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_extension.cc b/src/google/protobuf/compiler/javanano/javanano_extension.cc
deleted file mode 100644
index 0b9d1d8d..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_extension.cc
+++ /dev/null
@@ -1,150 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: bduff@google.com (Brian Duff)
-
-#include <google/protobuf/compiler/javanano/javanano_extension.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/wire_format.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-using internal::WireFormat;
-using internal::WireFormatLite;
-
-namespace {
-
-const char* GetTypeConstantName(const FieldDescriptor::Type type) {
-  switch (type) {
-    case FieldDescriptor::TYPE_INT32   : return "TYPE_INT32"   ;
-    case FieldDescriptor::TYPE_UINT32  : return "TYPE_UINT32"  ;
-    case FieldDescriptor::TYPE_SINT32  : return "TYPE_SINT32"  ;
-    case FieldDescriptor::TYPE_FIXED32 : return "TYPE_FIXED32" ;
-    case FieldDescriptor::TYPE_SFIXED32: return "TYPE_SFIXED32";
-    case FieldDescriptor::TYPE_INT64   : return "TYPE_INT64"   ;
-    case FieldDescriptor::TYPE_UINT64  : return "TYPE_UINT64"  ;
-    case FieldDescriptor::TYPE_SINT64  : return "TYPE_SINT64"  ;
-    case FieldDescriptor::TYPE_FIXED64 : return "TYPE_FIXED64" ;
-    case FieldDescriptor::TYPE_SFIXED64: return "TYPE_SFIXED64";
-    case FieldDescriptor::TYPE_FLOAT   : return "TYPE_FLOAT"   ;
-    case FieldDescriptor::TYPE_DOUBLE  : return "TYPE_DOUBLE"  ;
-    case FieldDescriptor::TYPE_BOOL    : return "TYPE_BOOL"    ;
-    case FieldDescriptor::TYPE_STRING  : return "TYPE_STRING"  ;
-    case FieldDescriptor::TYPE_BYTES   : return "TYPE_BYTES"   ;
-    case FieldDescriptor::TYPE_ENUM    : return "TYPE_ENUM"    ;
-    case FieldDescriptor::TYPE_GROUP   : return "TYPE_GROUP"   ;
-    case FieldDescriptor::TYPE_MESSAGE : return "TYPE_MESSAGE" ;
-
-    // No default because we want the compiler to complain if any new
-    // types are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return NULL;
-}
-
-}  // namespace
-
-void SetVariables(const FieldDescriptor* descriptor, const Params params,
-                  map<string, string>* variables) {
-  (*variables)["extends"] = ClassName(params, descriptor->containing_type());
-  (*variables)["name"] = RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  bool repeated = descriptor->is_repeated();
-  (*variables)["repeated"] = repeated ? "Repeated" : "";
-  (*variables)["type"] = GetTypeConstantName(descriptor->type());
-  JavaType java_type = GetJavaType(descriptor->type());
-  string tag = SimpleItoa(WireFormat::MakeTag(descriptor));
-  if (java_type == JAVATYPE_MESSAGE) {
-    (*variables)["ext_type"] = "MessageTyped";
-    string message_type = ClassName(params, descriptor->message_type());
-    if (repeated) {
-      message_type += "[]";
-    }
-    (*variables)["class"] = message_type;
-    // For message typed extensions, tags_params contains a single tag
-    // for both singular and repeated cases.
-    (*variables)["tag_params"] = tag;
-  } else {
-    (*variables)["ext_type"] = "PrimitiveTyped";
-    if (!repeated) {
-      (*variables)["class"] = BoxedPrimitiveTypeName(java_type);
-      (*variables)["tag_params"] = tag;
-    } else {
-      (*variables)["class"] = PrimitiveTypeName(java_type) + "[]";
-      if (!descriptor->is_packable()) {
-        // Non-packable: nonPackedTag == tag, packedTag == 0
-        (*variables)["tag_params"] = tag + ", " + tag + ", 0";
-      } else if (descriptor->options().packed()) {
-        // Packable and packed: tag == packedTag
-        string non_packed_tag = SimpleItoa(WireFormatLite::MakeTag(
-            descriptor->number(),
-            WireFormat::WireTypeForFieldType(descriptor->type())));
-        (*variables)["tag_params"] = tag + ", " + non_packed_tag + ", " + tag;
-      } else {
-        // Packable and not packed: tag == nonPackedTag
-        string packed_tag = SimpleItoa(WireFormatLite::MakeTag(
-            descriptor->number(), WireFormatLite::WIRETYPE_LENGTH_DELIMITED));
-        (*variables)["tag_params"] = tag + ", " + tag + ", " + packed_tag;
-      }
-    }
-  }
-}
-
-ExtensionGenerator::
-ExtensionGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : params_(params), descriptor_(descriptor) {
-  SetVariables(descriptor, params, &variables_);
-}
-
-ExtensionGenerator::~ExtensionGenerator() {}
-
-void ExtensionGenerator::Generate(io::Printer* printer) const {
-  printer->Print("\n");
-  PrintFieldComment(printer, descriptor_);
-  printer->Print(variables_,
-    "public static final com.google.protobuf.nano.Extension<\n"
-    "    $extends$,\n"
-    "    $class$> $name$ =\n"
-    "        com.google.protobuf.nano.Extension.create$repeated$$ext_type$(\n"
-    "            com.google.protobuf.nano.Extension.$type$,\n"
-    "            $class$.class,\n"
-    "            $tag_params$L);\n");
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
-
diff --git a/src/google/protobuf/compiler/javanano/javanano_field.cc b/src/google/protobuf/compiler/javanano/javanano_field.cc
deleted file mode 100644
index 85257f3f..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_field.cc
+++ /dev/null
@@ -1,209 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/compiler/javanano/javanano_primitive_field.h>
-#include <google/protobuf/compiler/javanano/javanano_enum_field.h>
-#include <google/protobuf/compiler/javanano/javanano_map_field.h>
-#include <google/protobuf/compiler/javanano/javanano_message_field.h>
-#include <google/protobuf/stubs/common.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-FieldGenerator::~FieldGenerator() {}
-
-bool FieldGenerator::SavedDefaultNeeded() const {
-  // No saved default for this field by default.
-  // Subclasses whose instances may need saved defaults will override this
-  // and return the appropriate value.
-  return false;
-}
-
-void FieldGenerator::GenerateInitSavedDefaultCode(io::Printer* printer) const {
-  // No saved default for this field by default.
-  // Subclasses whose instances may need saved defaults will override this
-  // and generate the appropriate init code to the printer.
-}
-
-void FieldGenerator::GenerateMergingCodeFromPacked(io::Printer* printer) const {
-  // Reaching here indicates a bug. Cases are:
-  //   - This FieldGenerator should support packing, but this method should be
-  //     overridden.
-  //   - This FieldGenerator doesn't support packing, and this method should
-  //     never have been called.
-  GOOGLE_LOG(FATAL) << "GenerateParsingCodeFromPacked() "
-             << "called on field generator that does not support packing.";
-}
-
-// =============================================
-
-FieldGeneratorMap::FieldGeneratorMap(
-    const Descriptor* descriptor, const Params &params)
-  : descriptor_(descriptor),
-    field_generators_(
-      new scoped_ptr<FieldGenerator>[descriptor->field_count()]) {
-
-  int next_has_bit_index = 0;
-  bool saved_defaults_needed = false;
-  // Construct all the FieldGenerators.
-  for (int i = 0; i < descriptor->field_count(); i++) {
-    FieldGenerator* field_generator = MakeGenerator(
-        descriptor->field(i), params, &next_has_bit_index);
-    saved_defaults_needed = saved_defaults_needed
-        || field_generator->SavedDefaultNeeded();
-    field_generators_[i].reset(field_generator);
-  }
-  total_bits_ = next_has_bit_index;
-  saved_defaults_needed_ = saved_defaults_needed;
-}
-
-FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
-    const Params &params, int* next_has_bit_index) {
-  JavaType java_type = GetJavaType(field);
-  if (field->is_repeated()) {
-    switch (java_type) {
-      case JAVATYPE_MESSAGE:
-        if (IsMapEntry(field->message_type())) {
-          return new MapFieldGenerator(field, params);
-        } else {
-          return new RepeatedMessageFieldGenerator(field, params);
-        }
-      case JAVATYPE_ENUM:
-        return new RepeatedEnumFieldGenerator(field, params);
-      default:
-        return new RepeatedPrimitiveFieldGenerator(field, params);
-    }
-  } else if (field->containing_oneof()) {
-    switch (java_type) {
-      case JAVATYPE_MESSAGE:
-        return new MessageOneofFieldGenerator(field, params);
-      case JAVATYPE_ENUM:
-      default:
-        return new PrimitiveOneofFieldGenerator(field, params);
-    }
-  } else if (params.optional_field_accessors() && field->is_optional()
-      && java_type != JAVATYPE_MESSAGE) {
-    // We need a has-bit for each primitive/enum field because their default
-    // values could be same as explicitly set values. But we don't need it
-    // for a message field because they have no defaults and Nano uses 'null'
-    // for unset messages, which cannot be set explicitly.
-    switch (java_type) {
-      case JAVATYPE_ENUM:
-        return new AccessorEnumFieldGenerator(
-            field, params, (*next_has_bit_index)++);
-      default:
-        return new AccessorPrimitiveFieldGenerator(
-            field, params, (*next_has_bit_index)++);
-    }
-  } else {
-    switch (java_type) {
-      case JAVATYPE_MESSAGE:
-        return new MessageFieldGenerator(field, params);
-      case JAVATYPE_ENUM:
-        return new EnumFieldGenerator(field, params);
-      default:
-        return new PrimitiveFieldGenerator(field, params);
-    }
-  }
-}
-
-FieldGeneratorMap::~FieldGeneratorMap() {}
-
-const FieldGenerator& FieldGeneratorMap::get(
-    const FieldDescriptor* field) const {
-  GOOGLE_CHECK_EQ(field->containing_type(), descriptor_);
-  return *field_generators_[field->index()];
-}
-
-void SetCommonOneofVariables(const FieldDescriptor* descriptor,
-                             map<string, string>* variables) {
-  (*variables)["oneof_name"] =
-      UnderscoresToCamelCase(descriptor->containing_oneof());
-  (*variables)["oneof_capitalized_name"] =
-      UnderscoresToCapitalizedCamelCase(descriptor->containing_oneof());
-  (*variables)["oneof_index"] =
-      SimpleItoa(descriptor->containing_oneof()->index());
-  (*variables)["set_oneof_case"] =
-      "this." + (*variables)["oneof_name"] +
-      "Case_ = " + SimpleItoa(descriptor->number());
-  (*variables)["clear_oneof_case"] =
-      "this." + (*variables)["oneof_name"] + "Case_ = 0";
-  (*variables)["has_oneof_case"] =
-      "this." + (*variables)["oneof_name"] + "Case_ == " +
-      SimpleItoa(descriptor->number());
-}
-
-void GenerateOneofFieldEquals(const FieldDescriptor* descriptor,
-                              const map<string, string>& variables,
-                              io::Printer* printer) {
-  if (GetJavaType(descriptor) == JAVATYPE_BYTES) {
-    printer->Print(variables,
-      "if (this.has$capitalized_name$()) {\n"
-      "  if (!java.util.Arrays.equals((byte[]) this.$oneof_name$_,\n"
-      "                               (byte[]) other.$oneof_name$_)) {\n"
-      "    return false;\n"
-      "  }\n"
-      "}\n");
-  } else {
-    printer->Print(variables,
-      "if (this.has$capitalized_name$()) {\n"
-      "  if (!this.$oneof_name$_.equals(other.$oneof_name$_)) {\n"
-      "    return false;\n"
-      "  }\n"
-      "}\n");
-  }
-}
-
-void GenerateOneofFieldHashCode(const FieldDescriptor* descriptor,
-                                const map<string, string>& variables,
-                                io::Printer* printer) {
-  if (GetJavaType(descriptor) == JAVATYPE_BYTES) {
-    printer->Print(variables,
-      "result = 31 * result + ($has_oneof_case$\n"
-      "   ? java.util.Arrays.hashCode((byte[]) this.$oneof_name$_) : 0);\n");
-  } else {
-    printer->Print(variables,
-      "result = 31 * result +\n"
-      "  ($has_oneof_case$ ? this.$oneof_name$_.hashCode() : 0);\n");
-  }
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_field.h b/src/google/protobuf/compiler/javanano/javanano_field.h
deleted file mode 100644
index 57c221f4..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_field.h
+++ /dev/null
@@ -1,130 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__
-
-#include <map>
-#include <string>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-
-namespace google {
-namespace protobuf {
-  namespace io {
-    class Printer;             // printer.h
-  }
-}
-
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class FieldGenerator {
- public:
-  FieldGenerator(const Params& params) : params_(params) {}
-  virtual ~FieldGenerator();
-
-  virtual bool SavedDefaultNeeded() const;
-  virtual void GenerateInitSavedDefaultCode(io::Printer* printer) const;
-
-  // Generates code for Java fields and methods supporting this field.
-  // If this field needs a saved default (SavedDefaultNeeded() is true),
-  // then @lazy_init controls how the static field for that default value
-  // and its initialization code should be generated. If @lazy_init is
-  // true, the static field is not declared final and the initialization
-  // code is generated only when GenerateInitSavedDefaultCode is called;
-  // otherwise, the static field is declared final and initialized inline.
-  // GenerateInitSavedDefaultCode will not be called in the latter case.
-  virtual void GenerateMembers(
-      io::Printer* printer, bool lazy_init) const = 0;
-
-  virtual void GenerateClearCode(io::Printer* printer) const = 0;
-  virtual void GenerateMergingCode(io::Printer* printer) const = 0;
-
-  // Generates code to merge from packed serialized form. The default
-  // implementation will fail; subclasses which can handle packed serialized
-  // forms will override this and print appropriate code to the printer.
-  virtual void GenerateMergingCodeFromPacked(io::Printer* printer) const;
-
-  virtual void GenerateSerializationCode(io::Printer* printer) const = 0;
-  virtual void GenerateSerializedSizeCode(io::Printer* printer) const = 0;
-  virtual void GenerateEqualsCode(io::Printer* printer) const = 0;
-  virtual void GenerateHashCodeCode(io::Printer* printer) const = 0;
-  virtual void GenerateFixClonedCode(io::Printer* printer) const {}
-
- protected:
-  const Params& params_;
- private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
-};
-
-// Convenience class which constructs FieldGenerators for a Descriptor.
-class FieldGeneratorMap {
- public:
-  explicit FieldGeneratorMap(const Descriptor* descriptor, const Params &params);
-  ~FieldGeneratorMap();
-
-  const FieldGenerator& get(const FieldDescriptor* field) const;
-  int total_bits() const { return total_bits_; }
-  bool saved_defaults_needed() const { return saved_defaults_needed_; }
-
- private:
-  const Descriptor* descriptor_;
-  scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
-  int total_bits_;
-  bool saved_defaults_needed_;
-
-  static FieldGenerator* MakeGenerator(const FieldDescriptor* field,
-      const Params &params, int* next_has_bit_index);
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
-};
-
-void SetCommonOneofVariables(const FieldDescriptor* descriptor,
-                             map<string, string>* variables);
-void GenerateOneofFieldEquals(const FieldDescriptor* descriptor,
-                              const map<string, string>& variables,
-                              io::Printer* printer);
-void GenerateOneofFieldHashCode(const FieldDescriptor* descriptor,
-                                const map<string, string>& variables,
-                                io::Printer* printer);
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_FIELD_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_file.cc b/src/google/protobuf/compiler/javanano/javanano_file.cc
deleted file mode 100644
index 3676ab9d..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_file.cc
+++ /dev/null
@@ -1,263 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <iostream>
-
-#include <google/protobuf/compiler/javanano/javanano_file.h>
-#include <google/protobuf/compiler/javanano/javanano_enum.h>
-#include <google/protobuf/compiler/javanano/javanano_extension.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/compiler/javanano/javanano_message.h>
-#include <google/protobuf/compiler/code_generator.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-namespace {
-
-// Recursively searches the given message to see if it contains any extensions.
-bool UsesExtensions(const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-
-  // We conservatively assume that unknown fields are extensions.
-  if (reflection->GetUnknownFields(message).field_count() > 0) return true;
-
-  vector<const FieldDescriptor*> fields;
-  reflection->ListFields(message, &fields);
-
-  for (int i = 0; i < fields.size(); i++) {
-    if (fields[i]->is_extension()) return true;
-
-    if (fields[i]->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
-      if (fields[i]->is_repeated()) {
-        int size = reflection->FieldSize(message, fields[i]);
-        for (int j = 0; j < size; j++) {
-          const Message& sub_message =
-            reflection->GetRepeatedMessage(message, fields[i], j);
-          if (UsesExtensions(sub_message)) return true;
-        }
-      } else {
-        const Message& sub_message = reflection->GetMessage(message, fields[i]);
-        if (UsesExtensions(sub_message)) return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-}  // namespace
-
-FileGenerator::FileGenerator(const FileDescriptor* file, const Params& params)
-  : file_(file),
-    params_(params),
-    java_package_(FileJavaPackage(params, file)),
-    classname_(FileClassName(params, file)) {}
-
-FileGenerator::~FileGenerator() {}
-
-bool FileGenerator::Validate(string* error) {
-  // Check for extensions
-  FileDescriptorProto file_proto;
-  file_->CopyTo(&file_proto);
-  if (UsesExtensions(file_proto) && !params_.store_unknown_fields()) {
-    error->assign(file_->name());
-    error->append(
-        ": Java NANO_RUNTIME only supports extensions when the "
-        "'store_unknown_fields' generator option is 'true'.");
-    return false;
-  }
-
-  if (file_->service_count() != 0 && !params_.ignore_services()) {
-    error->assign(file_->name());
-    error->append(
-      ": Java NANO_RUNTIME does not support services\"");
-    return false;
-  }
-
-  if (!IsOuterClassNeeded(params_, file_)) {
-    return true;
-  }
-
-  // Check whether legacy javanano generator would omit the outer class.
-  if (!params_.has_java_outer_classname(file_->name())
-      && file_->message_type_count() == 1
-      && file_->enum_type_count() == 0 && file_->extension_count() == 0) {
-    cout << "INFO: " << file_->name() << ":" << endl;
-    cout << "Javanano generator has changed to align with java generator. "
-        "An outer class will be created for this file and the single message "
-        "in the file will become a nested class. Use java_multiple_files to "
-        "skip generating the outer class, or set an explicit "
-        "java_outer_classname to suppress this message." << endl;
-  }
-
-  // Check that no class name matches the file's class name.  This is a common
-  // problem that leads to Java compile errors that can be hard to understand.
-  // It's especially bad when using the java_multiple_files, since we would
-  // end up overwriting the outer class with one of the inner ones.
-  bool found_conflict = false;
-  for (int i = 0; !found_conflict && i < file_->message_type_count(); i++) {
-    if (file_->message_type(i)->name() == classname_) {
-      found_conflict = true;
-    }
-  }
-  if (params_.java_enum_style()) {
-    for (int i = 0; !found_conflict && i < file_->enum_type_count(); i++) {
-      if (file_->enum_type(i)->name() == classname_) {
-        found_conflict = true;
-      }
-    }
-  }
-  if (found_conflict) {
-    error->assign(file_->name());
-    error->append(
-      ": Cannot generate Java output because the file's outer class name, \"");
-    error->append(classname_);
-    error->append(
-      "\", matches the name of one of the types declared inside it.  "
-      "Please either rename the type or use the java_outer_classname "
-      "option to specify a different outer class name for the .proto file.");
-    return false;
-  }
-  return true;
-}
-
-void FileGenerator::Generate(io::Printer* printer) {
-  // We don't import anything because we refer to all classes by their
-  // fully-qualified names in the generated source.
-  printer->Print(
-    "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n");
-  if (!java_package_.empty()) {
-    printer->Print(
-      "\n"
-      "package $package$;\n",
-      "package", java_package_);
-  }
-
-  // Note: constants (from enums, emitted in the loop below) may have the same names as constants
-  // in the nested classes. This causes Java warnings, but is not fatal, so we suppress those
-  // warnings here in the top-most class declaration.
-  printer->Print(
-    "\n"
-    "@SuppressWarnings(\"hiding\")\n"
-    "public interface $classname$ {\n",
-    "classname", classname_);
-  printer->Indent();
-
-  // -----------------------------------------------------------------
-
-  // Extensions.
-  for (int i = 0; i < file_->extension_count(); i++) {
-    ExtensionGenerator(file_->extension(i), params_).Generate(printer);
-  }
-
-  // Enums.
-  for (int i = 0; i < file_->enum_type_count(); i++) {
-    EnumGenerator(file_->enum_type(i), params_).Generate(printer);
-  }
-
-  // Messages.
-  if (!params_.java_multiple_files(file_->name())) {
-    for (int i = 0; i < file_->message_type_count(); i++) {
-      MessageGenerator(file_->message_type(i), params_).Generate(printer);
-    }
-  }
-
-  // Static variables.
-  for (int i = 0; i < file_->message_type_count(); i++) {
-    // TODO(kenton):  Reuse MessageGenerator objects?
-    MessageGenerator(file_->message_type(i), params_).GenerateStaticVariables(printer);
-  }
-
-  printer->Outdent();
-  printer->Print(
-    "}\n");
-}
-
-template<typename GeneratorClass, typename DescriptorClass>
-static void GenerateSibling(const string& package_dir,
-                            const string& java_package,
-                            const DescriptorClass* descriptor,
-                            GeneratorContext* output_directory,
-                            vector<string>* file_list,
-                            const Params& params) {
-  string filename = package_dir + descriptor->name() + ".java";
-  file_list->push_back(filename);
-
-  scoped_ptr<io::ZeroCopyOutputStream> output(
-    output_directory->Open(filename));
-  io::Printer printer(output.get(), '$');
-
-  printer.Print(
-    "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n");
-  if (!java_package.empty()) {
-    printer.Print(
-      "\n"
-      "package $package$;\n",
-      "package", java_package);
-  }
-
-  GeneratorClass(descriptor, params).Generate(&printer);
-}
-
-void FileGenerator::GenerateSiblings(const string& package_dir,
-                                     GeneratorContext* output_directory,
-                                     vector<string>* file_list) {
-  if (params_.java_multiple_files(file_->name())) {
-    for (int i = 0; i < file_->message_type_count(); i++) {
-      GenerateSibling<MessageGenerator>(package_dir, java_package_,
-                                        file_->message_type(i),
-                                        output_directory, file_list, params_);
-    }
-
-    if (params_.java_enum_style()) {
-      for (int i = 0; i < file_->enum_type_count(); i++) {
-        GenerateSibling<EnumGenerator>(package_dir, java_package_,
-                                       file_->enum_type(i),
-                                       output_directory, file_list, params_);
-      }
-    }
-  }
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_generator.cc b/src/google/protobuf/compiler/javanano/javanano_generator.cc
deleted file mode 100644
index 7c3a0421..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_generator.cc
+++ /dev/null
@@ -1,230 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/compiler/javanano/javanano_generator.h>
-#include <google/protobuf/compiler/javanano/javanano_file.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-namespace {
-
-string TrimString(const string& s) {
-  string::size_type start = s.find_first_not_of(" \n\r\t");
-  if (start == string::npos) {
-    return "";
-  }
-  string::size_type end = s.find_last_not_of(" \n\r\t") + 1;
-  return s.substr(start, end - start);
-}
-
-} // namespace
-
-void UpdateParamsRecursively(Params& params,
-    const FileDescriptor* file) {
-  // Add any parameters for this file
-  if (file->options().has_java_outer_classname()) {
-    params.set_java_outer_classname(
-      file->name(), file->options().java_outer_classname());
-  }
-  if (file->options().has_java_package()) {
-    string result = file->options().java_package();
-    if (!result.empty()) {
-      result += ".";
-    }
-    result += "nano";
-    params.set_java_package(
-      file->name(), result);
-  }
-  if (file->options().has_java_multiple_files()) {
-    params.set_java_multiple_files(
-      file->name(), file->options().java_multiple_files());
-  }
-
-  // Loop through all dependent files recursively
-  // adding dep
-  for (int i = 0; i < file->dependency_count(); i++) {
-    UpdateParamsRecursively(params, file->dependency(i));
-  }
-}
-
-JavaNanoGenerator::JavaNanoGenerator() {}
-JavaNanoGenerator::~JavaNanoGenerator() {}
-
-bool JavaNanoGenerator::Generate(const FileDescriptor* file,
-                             const string& parameter,
-                             GeneratorContext* output_directory,
-                             string* error) const {
-  vector<pair<string, string> > options;
-
-  ParseGeneratorParameter(parameter, &options);
-
-  // -----------------------------------------------------------------
-  // parse generator options
-
-  // Name a file where we will write a list of generated file names, one
-  // per line.
-  string output_list_file;
-  Params params(file->name());
-
-  // Update per file params
-  UpdateParamsRecursively(params, file);
-
-  // Replace any existing options with ones from command line
-  for (int i = 0; i < options.size(); i++) {
-    string option_name = TrimString(options[i].first);
-    string option_value = TrimString(options[i].second);
-    if (option_name == "output_list_file") {
-      output_list_file = option_value;
-    } else if (option_name == "java_package") {
-        vector<string> parts;
-        SplitStringUsing(option_value, "|", &parts);
-        if (parts.size() != 2) {
-          *error = "Bad java_package, expecting filename|PackageName found '"
-            + option_value + "'";
-          return false;
-        }
-        params.set_java_package(parts[0], parts[1]);
-    } else if (option_name == "java_outer_classname") {
-        vector<string> parts;
-        SplitStringUsing(option_value, "|", &parts);
-        if (parts.size() != 2) {
-          *error = "Bad java_outer_classname, "
-                   "expecting filename|ClassName found '"
-                   + option_value + "'";
-          return false;
-        }
-        params.set_java_outer_classname(parts[0], parts[1]);
-    } else if (option_name == "store_unknown_fields") {
-      params.set_store_unknown_fields(option_value == "true");
-    } else if (option_name == "java_multiple_files") {
-      params.set_override_java_multiple_files(option_value == "true");
-    } else if (option_name == "java_nano_generate_has") {
-      params.set_generate_has(option_value == "true");
-    } else if (option_name == "enum_style") {
-      params.set_java_enum_style(option_value == "java");
-    } else if (option_name == "optional_field_style") {
-      params.set_optional_field_accessors(option_value == "accessors");
-      params.set_use_reference_types_for_primitives(option_value == "reftypes"
-          || option_value == "reftypes_compat_mode");
-      params.set_reftypes_primitive_enums(
-          option_value == "reftypes_compat_mode");
-      if (option_value == "reftypes_compat_mode") {
-        params.set_generate_clear(false);
-      }
-    } else if (option_name == "generate_equals") {
-      params.set_generate_equals(option_value == "true");
-    } else if (option_name == "ignore_services") {
-      params.set_ignore_services(option_value == "true");
-    } else if (option_name == "parcelable_messages") {
-      params.set_parcelable_messages(option_value == "true");
-    } else if (option_name == "generate_clone") {
-      params.set_generate_clone(option_value == "true");
-    } else if (option_name == "generate_intdefs") {
-      params.set_generate_intdefs(option_value == "true");
-    } else if (option_name == "generate_clear") {
-      params.set_generate_clear(option_value == "true");
-    } else {
-      *error = "Ignore unknown javanano generator option: " + option_name;
-    }
-  }
-
-  // Check illegal parameter combinations
-  // Note: the enum-like optional_field_style generator param ensures
-  // that we can never have illegal combinations of field styles
-  // (e.g. reftypes and accessors can't be on at the same time).
-  if (params.generate_has()
-      && (params.optional_field_accessors()
-          || params.use_reference_types_for_primitives())) {
-    error->assign("java_nano_generate_has=true cannot be used in conjunction"
-        " with optional_field_style=accessors or optional_field_style=reftypes");
-    return false;
-  }
-
-  // -----------------------------------------------------------------
-
-  FileGenerator file_generator(file, params);
-  if (!file_generator.Validate(error)) {
-    return false;
-  }
-
-  string package_dir =
-    StringReplace(file_generator.java_package(), ".", "/", true);
-  if (!package_dir.empty()) package_dir += "/";
-
-  vector<string> all_files;
-
-  if (IsOuterClassNeeded(params, file)) {
-    string java_filename = package_dir;
-    java_filename += file_generator.classname();
-    java_filename += ".java";
-    all_files.push_back(java_filename);
-
-    // Generate main java file.
-    scoped_ptr<io::ZeroCopyOutputStream> output(
-      output_directory->Open(java_filename));
-    io::Printer printer(output.get(), '$');
-    file_generator.Generate(&printer);
-  }
-
-  // Generate sibling files.
-  file_generator.GenerateSiblings(package_dir, output_directory, &all_files);
-
-  // Generate output list if requested.
-  if (!output_list_file.empty()) {
-    // Generate output list.  This is just a simple text file placed in a
-    // deterministic location which lists the .java files being generated.
-    scoped_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
-      output_directory->Open(output_list_file));
-    io::Printer srclist_printer(srclist_raw_output.get(), '$');
-    for (int i = 0; i < all_files.size(); i++) {
-      srclist_printer.Print("$filename$\n", "filename", all_files[i]);
-    }
-  }
-
-  return true;
-}
-
-}  // namespace java
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_helpers.cc b/src/google/protobuf/compiler/javanano/javanano_helpers.cc
deleted file mode 100644
index 02811a24..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_helpers.cc
+++ /dev/null
@@ -1,591 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <limits>
-#include <vector>
-
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/stubs/hash.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/stubs/substitute.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-const char kThickSeparator[] =
-  "// ===================================================================\n";
-const char kThinSeparator[] =
-  "// -------------------------------------------------------------------\n";
-
-class RenameKeywords {
- private:
-  hash_set<string> java_keywords_set_;
-
- public:
-  RenameKeywords() {
-    static const char* kJavaKeywordsList[] = {
-      // Reserved Java Keywords
-      "abstract", "assert", "boolean", "break", "byte", "case", "catch",
-      "char", "class", "const", "continue", "default", "do", "double", "else",
-      "enum", "extends", "final", "finally", "float", "for", "goto", "if",
-      "implements", "import", "instanceof", "int", "interface", "long",
-      "native", "new", "package", "private", "protected", "public", "return",
-      "short", "static", "strictfp", "super", "switch", "synchronized",
-      "this", "throw", "throws", "transient", "try", "void", "volatile", "while",
-
-      // Reserved Keywords for Literals
-      "false", "null", "true"
-    };
-
-    for (int i = 0; i < GOOGLE_ARRAYSIZE(kJavaKeywordsList); i++) {
-      java_keywords_set_.insert(kJavaKeywordsList[i]);
-    }
-  }
-
-  // Used to rename the a field name if it's a java keyword.  Specifically
-  // this is used to rename the ["name"] or ["capitalized_name"] field params.
-  // (http://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html)
-  string RenameJavaKeywordsImpl(const string& input) {
-    string result = input;
-
-    if (java_keywords_set_.find(result) != java_keywords_set_.end()) {
-      result += "_";
-    }
-
-    return result;
-  }
-
-};
-
-static RenameKeywords sRenameKeywords;
-
-namespace {
-
-const char* kDefaultPackage = "";
-
-const string& FieldName(const FieldDescriptor* field) {
-  // Groups are hacky:  The name of the field is just the lower-cased name
-  // of the group type.  In Java, though, we would like to retain the original
-  // capitalization of the type name.
-  if (field->type() == FieldDescriptor::TYPE_GROUP) {
-    return field->message_type()->name();
-  } else {
-    return field->name();
-  }
-}
-
-string UnderscoresToCamelCaseImpl(const string& input, bool cap_next_letter) {
-  string result;
-  // Note:  I distrust ctype.h due to locales.
-  for (int i = 0; i < input.size(); i++) {
-    if ('a' <= input[i] && input[i] <= 'z') {
-      if (cap_next_letter) {
-        result += input[i] + ('A' - 'a');
-      } else {
-        result += input[i];
-      }
-      cap_next_letter = false;
-    } else if ('A' <= input[i] && input[i] <= 'Z') {
-      if (i == 0 && !cap_next_letter) {
-        // Force first letter to lower-case unless explicitly told to
-        // capitalize it.
-        result += input[i] + ('a' - 'A');
-      } else {
-        // Capital letters after the first are left as-is.
-        result += input[i];
-      }
-      cap_next_letter = false;
-    } else if ('0' <= input[i] && input[i] <= '9') {
-      result += input[i];
-      cap_next_letter = true;
-    } else {
-      cap_next_letter = true;
-    }
-  }
-  return result;
-}
-
-}  // namespace
-
-string UnderscoresToCamelCase(const FieldDescriptor* field) {
-  return UnderscoresToCamelCaseImpl(FieldName(field), false);
-}
-
-string UnderscoresToCapitalizedCamelCase(const FieldDescriptor* field) {
-  return UnderscoresToCamelCaseImpl(FieldName(field), true);
-}
-
-string UnderscoresToCamelCase(const MethodDescriptor* method) {
-  return UnderscoresToCamelCaseImpl(method->name(), false);
-}
-
-string UnderscoresToCamelCase(const OneofDescriptor* oneof) {
-  return UnderscoresToCamelCaseImpl(oneof->name(), false);
-}
-
-string UnderscoresToCapitalizedCamelCase(const OneofDescriptor* oneof) {
-  return UnderscoresToCamelCaseImpl(oneof->name(), true);
-}
-
-string RenameJavaKeywords(const string& input) {
-  return sRenameKeywords.RenameJavaKeywordsImpl(input);
-}
-
-string StripProto(const string& filename) {
-  if (HasSuffixString(filename, ".protodevel")) {
-    return StripSuffixString(filename, ".protodevel");
-  } else {
-    return StripSuffixString(filename, ".proto");
-  }
-}
-
-string FileClassName(const Params& params, const FileDescriptor* file) {
-  if (params.has_java_outer_classname(file->name())) {
-    return params.java_outer_classname(file->name());
-  } else {
-    // Use the filename itself with underscores removed
-    // and a CamelCase style name.
-    string basename;
-    string::size_type last_slash = file->name().find_last_of('/');
-    if (last_slash == string::npos) {
-      basename = file->name();
-    } else {
-      basename = file->name().substr(last_slash + 1);
-    }
-    return UnderscoresToCamelCaseImpl(StripProto(basename), true);
-  }
-}
-
-string FileJavaPackage(const Params& params, const FileDescriptor* file) {
-  if (params.has_java_package(file->name())) {
-    return params.java_package(file->name());
-  } else {
-    string result = kDefaultPackage;
-    if (!file->package().empty()) {
-      if (!result.empty()) result += '.';
-      result += file->package();
-    }
-
-    if (!result.empty()) {
-      result += ".";
-    }
-    result += "nano";
-
-    return result;
-  }
-}
-
-bool IsOuterClassNeeded(const Params& params, const FileDescriptor* file) {
-  // If java_multiple_files is false, the outer class is always needed.
-  if (!params.java_multiple_files(file->name())) {
-    return true;
-  }
-
-  // File-scope extensions need the outer class as the scope.
-  if (file->extension_count() != 0) {
-    return true;
-  }
-
-  // If container interfaces are not generated, file-scope enums need the
-  // outer class as the scope.
-  if (file->enum_type_count() != 0 && !params.java_enum_style()) {
-    return true;
-  }
-
-  return false;
-}
-
-string ToJavaName(const Params& params, const string& name, bool is_class,
-    const Descriptor* parent, const FileDescriptor* file) {
-  string result;
-  if (parent != NULL) {
-    result.append(ClassName(params, parent));
-  } else if (is_class && params.java_multiple_files(file->name())) {
-    result.append(FileJavaPackage(params, file));
-  } else {
-    result.append(ClassName(params, file));
-  }
-  if (!result.empty()) result.append(1, '.');
-  result.append(RenameJavaKeywords(name));
-  return result;
-}
-
-string ClassName(const Params& params, const FileDescriptor* descriptor) {
-  string result = FileJavaPackage(params, descriptor);
-  if (!result.empty()) result += '.';
-  result += FileClassName(params, descriptor);
-  return result;
-}
-
-string ClassName(const Params& params, const EnumDescriptor* descriptor) {
-  const Descriptor* parent = descriptor->containing_type();
-  // When using Java enum style, an enum's class name contains the enum name.
-  // Use the standard ToJavaName translation.
-  if (params.java_enum_style()) {
-    return ToJavaName(params, descriptor->name(), true, parent,
-                      descriptor->file());
-  }
-  // Otherwise the enum members are accessed from the enclosing class.
-  if (parent != NULL) {
-    return ClassName(params, parent);
-  } else {
-    return ClassName(params, descriptor->file());
-  }
-}
-
-string FieldConstantName(const FieldDescriptor *field) {
-  string name = field->name() + "_FIELD_NUMBER";
-  UpperString(&name);
-  return name;
-}
-
-string FieldDefaultConstantName(const FieldDescriptor *field) {
-  return "_" + RenameJavaKeywords(UnderscoresToCamelCase(field)) + "Default";
-}
-
-void PrintFieldComment(io::Printer* printer, const FieldDescriptor* field) {
-  // We don't want to print group bodies so we cut off after the first line
-  // (the second line for extensions).
-  string def = field->DebugString();
-  string::size_type first_line_end = def.find_first_of('\n');
-  printer->Print("// $def$\n",
-    "def", def.substr(0, first_line_end));
-  if (field->is_extension()) {
-    string::size_type second_line_start = first_line_end + 1;
-    string::size_type second_line_length =
-        def.find('\n', second_line_start) - second_line_start;
-    printer->Print("// $def$\n",
-      "def", def.substr(second_line_start, second_line_length));
-  }
-}
-
-JavaType GetJavaType(FieldDescriptor::Type field_type) {
-  switch (field_type) {
-    case FieldDescriptor::TYPE_INT32:
-    case FieldDescriptor::TYPE_UINT32:
-    case FieldDescriptor::TYPE_SINT32:
-    case FieldDescriptor::TYPE_FIXED32:
-    case FieldDescriptor::TYPE_SFIXED32:
-      return JAVATYPE_INT;
-
-    case FieldDescriptor::TYPE_INT64:
-    case FieldDescriptor::TYPE_UINT64:
-    case FieldDescriptor::TYPE_SINT64:
-    case FieldDescriptor::TYPE_FIXED64:
-    case FieldDescriptor::TYPE_SFIXED64:
-      return JAVATYPE_LONG;
-
-    case FieldDescriptor::TYPE_FLOAT:
-      return JAVATYPE_FLOAT;
-
-    case FieldDescriptor::TYPE_DOUBLE:
-      return JAVATYPE_DOUBLE;
-
-    case FieldDescriptor::TYPE_BOOL:
-      return JAVATYPE_BOOLEAN;
-
-    case FieldDescriptor::TYPE_STRING:
-      return JAVATYPE_STRING;
-
-    case FieldDescriptor::TYPE_BYTES:
-      return JAVATYPE_BYTES;
-
-    case FieldDescriptor::TYPE_ENUM:
-      return JAVATYPE_ENUM;
-
-    case FieldDescriptor::TYPE_GROUP:
-    case FieldDescriptor::TYPE_MESSAGE:
-      return JAVATYPE_MESSAGE;
-
-    // No default because we want the compiler to complain if any new
-    // types are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return JAVATYPE_INT;
-}
-
-string PrimitiveTypeName(JavaType type) {
-  switch (type) {
-    case JAVATYPE_INT    : return "int";
-    case JAVATYPE_LONG   : return "long";
-    case JAVATYPE_FLOAT  : return "float";
-    case JAVATYPE_DOUBLE : return "double";
-    case JAVATYPE_BOOLEAN: return "boolean";
-    case JAVATYPE_STRING : return "java.lang.String";
-    case JAVATYPE_BYTES  : return "byte[]";
-    case JAVATYPE_ENUM   : return "int";
-    case JAVATYPE_MESSAGE: return "";
-
-    // No default because we want the compiler to complain if any new
-    // JavaTypes are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return "";
-}
-
-string BoxedPrimitiveTypeName(JavaType type) {
-  switch (type) {
-    case JAVATYPE_INT    : return "java.lang.Integer";
-    case JAVATYPE_LONG   : return "java.lang.Long";
-    case JAVATYPE_FLOAT  : return "java.lang.Float";
-    case JAVATYPE_DOUBLE : return "java.lang.Double";
-    case JAVATYPE_BOOLEAN: return "java.lang.Boolean";
-    case JAVATYPE_STRING : return "java.lang.String";
-    case JAVATYPE_BYTES  : return "byte[]";
-    case JAVATYPE_ENUM   : return "java.lang.Integer";
-    case JAVATYPE_MESSAGE: return "";
-
-    // No default because we want the compiler to complain if any new
-    // JavaTypes are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return "";
-}
-
-string EmptyArrayName(const Params& params, const FieldDescriptor* field) {
-  switch (GetJavaType(field)) {
-    case JAVATYPE_INT    : return "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
-    case JAVATYPE_LONG   : return "com.google.protobuf.nano.WireFormatNano.EMPTY_LONG_ARRAY";
-    case JAVATYPE_FLOAT  : return "com.google.protobuf.nano.WireFormatNano.EMPTY_FLOAT_ARRAY";
-    case JAVATYPE_DOUBLE : return "com.google.protobuf.nano.WireFormatNano.EMPTY_DOUBLE_ARRAY";
-    case JAVATYPE_BOOLEAN: return "com.google.protobuf.nano.WireFormatNano.EMPTY_BOOLEAN_ARRAY";
-    case JAVATYPE_STRING : return "com.google.protobuf.nano.WireFormatNano.EMPTY_STRING_ARRAY";
-    case JAVATYPE_BYTES  : return "com.google.protobuf.nano.WireFormatNano.EMPTY_BYTES_ARRAY";
-    case JAVATYPE_ENUM   : return "com.google.protobuf.nano.WireFormatNano.EMPTY_INT_ARRAY";
-    case JAVATYPE_MESSAGE: return ClassName(params, field->message_type()) + ".EMPTY_ARRAY";
-
-    // No default because we want the compiler to complain if any new
-    // JavaTypes are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return "";
-}
-
-string DefaultValue(const Params& params, const FieldDescriptor* field) {
-  if (field->label() == FieldDescriptor::LABEL_REPEATED) {
-    return EmptyArrayName(params, field);
-  }
-
-  if (params.use_reference_types_for_primitives()) {
-    if (params.reftypes_primitive_enums()
-          && field->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
-      return "Integer.MIN_VALUE";
-    }
-    return "null";
-  }
-
-  // Switch on cpp_type since we need to know which default_value_* method
-  // of FieldDescriptor to call.
-  switch (field->cpp_type()) {
-    case FieldDescriptor::CPPTYPE_INT32:
-      return SimpleItoa(field->default_value_int32());
-    case FieldDescriptor::CPPTYPE_UINT32:
-      // Need to print as a signed int since Java has no unsigned.
-      return SimpleItoa(static_cast<int32>(field->default_value_uint32()));
-    case FieldDescriptor::CPPTYPE_INT64:
-      return SimpleItoa(field->default_value_int64()) + "L";
-    case FieldDescriptor::CPPTYPE_UINT64:
-      return SimpleItoa(static_cast<int64>(field->default_value_uint64())) +
-             "L";
-    case FieldDescriptor::CPPTYPE_DOUBLE: {
-      double value = field->default_value_double();
-      if (value == numeric_limits<double>::infinity()) {
-        return "Double.POSITIVE_INFINITY";
-      } else if (value == -numeric_limits<double>::infinity()) {
-        return "Double.NEGATIVE_INFINITY";
-      } else if (value != value) {
-        return "Double.NaN";
-      } else {
-        return SimpleDtoa(value) + "D";
-      }
-    }
-    case FieldDescriptor::CPPTYPE_FLOAT: {
-      float value = field->default_value_float();
-      if (value == numeric_limits<float>::infinity()) {
-        return "Float.POSITIVE_INFINITY";
-      } else if (value == -numeric_limits<float>::infinity()) {
-        return "Float.NEGATIVE_INFINITY";
-      } else if (value != value) {
-        return "Float.NaN";
-      } else {
-        return SimpleFtoa(value) + "F";
-      }
-    }
-    case FieldDescriptor::CPPTYPE_BOOL:
-      return field->default_value_bool() ? "true" : "false";
-    case FieldDescriptor::CPPTYPE_STRING:
-      if (!field->default_value_string().empty()) {
-        // Point it to the static final in the generated code.
-        return FieldDefaultConstantName(field);
-      } else {
-        if (field->type() == FieldDescriptor::TYPE_BYTES) {
-          return "com.google.protobuf.nano.WireFormatNano.EMPTY_BYTES";
-        } else {
-          return "\"\"";
-        }
-      }
-
-    case FieldDescriptor::CPPTYPE_ENUM:
-      return ClassName(params, field->enum_type()) + "." +
-             RenameJavaKeywords(field->default_value_enum()->name());
-
-    case FieldDescriptor::CPPTYPE_MESSAGE:
-      return "null";
-
-    // No default because we want the compiler to complain if any new
-    // types are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return "";
-}
-
-
-static const char* kBitMasks[] = {
-  "0x00000001",
-  "0x00000002",
-  "0x00000004",
-  "0x00000008",
-  "0x00000010",
-  "0x00000020",
-  "0x00000040",
-  "0x00000080",
-
-  "0x00000100",
-  "0x00000200",
-  "0x00000400",
-  "0x00000800",
-  "0x00001000",
-  "0x00002000",
-  "0x00004000",
-  "0x00008000",
-
-  "0x00010000",
-  "0x00020000",
-  "0x00040000",
-  "0x00080000",
-  "0x00100000",
-  "0x00200000",
-  "0x00400000",
-  "0x00800000",
-
-  "0x01000000",
-  "0x02000000",
-  "0x04000000",
-  "0x08000000",
-  "0x10000000",
-  "0x20000000",
-  "0x40000000",
-  "0x80000000",
-};
-
-string GetBitFieldName(int index) {
-  string var_name = "bitField";
-  var_name += SimpleItoa(index);
-  var_name += "_";
-  return var_name;
-}
-
-string GetBitFieldNameForBit(int bit_index) {
-  return GetBitFieldName(bit_index / 32);
-}
-
-string GenerateGetBit(int bit_index) {
-  string var_name = GetBitFieldNameForBit(bit_index);
-  int bit_in_var_index = bit_index % 32;
-
-  string mask = kBitMasks[bit_in_var_index];
-  string result = "((" + var_name + " & " + mask + ") != 0)";
-  return result;
-}
-
-string GenerateSetBit(int bit_index) {
-  string var_name = GetBitFieldNameForBit(bit_index);
-  int bit_in_var_index = bit_index % 32;
-
-  string mask = kBitMasks[bit_in_var_index];
-  string result = var_name + " |= " + mask;
-  return result;
-}
-
-string GenerateClearBit(int bit_index) {
-  string var_name = GetBitFieldNameForBit(bit_index);
-  int bit_in_var_index = bit_index % 32;
-
-  string mask = kBitMasks[bit_in_var_index];
-  string result = var_name + " = (" + var_name + " & ~" + mask + ")";
-  return result;
-}
-
-string GenerateDifferentBit(int bit_index) {
-  string var_name = GetBitFieldNameForBit(bit_index);
-  int bit_in_var_index = bit_index % 32;
-
-  string mask = kBitMasks[bit_in_var_index];
-  string result = "((" + var_name + " & " + mask
-      + ") != (other." + var_name + " & " + mask + "))";
-  return result;
-}
-
-void SetBitOperationVariables(const string name,
-    int bitIndex, map<string, string>* variables) {
-  (*variables)["get_" + name] = GenerateGetBit(bitIndex);
-  (*variables)["set_" + name] = GenerateSetBit(bitIndex);
-  (*variables)["clear_" + name] = GenerateClearBit(bitIndex);
-  (*variables)["different_" + name] = GenerateDifferentBit(bitIndex);
-}
-
-bool HasMapField(const Descriptor* descriptor) {
-  for (int i = 0; i < descriptor->field_count(); ++i) {
-    const FieldDescriptor* field = descriptor->field(i);
-    if (field->type() == FieldDescriptor::TYPE_MESSAGE &&
-        IsMapEntry(field->message_type())) {
-      return true;
-    }
-  }
-  return false;
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_helpers.h b/src/google/protobuf/compiler/javanano/javanano_helpers.h
deleted file mode 100644
index 014c85ae..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_helpers.h
+++ /dev/null
@@ -1,199 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__
-
-#include <string>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/io/printer.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-// Commonly-used separator comments.  Thick is a line of '=', thin is a line
-// of '-'.
-extern const char kThickSeparator[];
-extern const char kThinSeparator[];
-
-// Converts the field's name to camel-case, e.g. "foo_bar_baz" becomes
-// "fooBarBaz" or "FooBarBaz", respectively.
-string UnderscoresToCamelCase(const FieldDescriptor* field);
-string UnderscoresToCamelCase(const OneofDescriptor* oneof);
-string UnderscoresToCapitalizedCamelCase(const FieldDescriptor* field);
-string UnderscoresToCapitalizedCamelCase(const OneofDescriptor* oneof);
-
-// Appends an "_" to the end of a field where the name is a reserved java
-// keyword.  For example int32 public = 1 will generate int public_.
-string RenameJavaKeywords(const string& input);
-
-// Similar, but for method names.  (Typically, this merely has the effect
-// of lower-casing the first letter of the name.)
-string UnderscoresToCamelCase(const MethodDescriptor* method);
-
-// Strips ".proto" or ".protodevel" from the end of a filename.
-string StripProto(const string& filename);
-
-// Gets the unqualified class name for the file.  Each .proto file becomes a
-// single Java class, with all its contents nested in that class.
-string FileClassName(const Params& params, const FileDescriptor* file);
-
-// Returns the file's Java package name.
-string FileJavaPackage(const Params& params, const FileDescriptor* file);
-
-// Returns whether the Java outer class is needed, i.e. whether the option
-// java_multiple_files is false, or the proto file contains any file-scope
-// enums/extensions.
-bool IsOuterClassNeeded(const Params& params, const FileDescriptor* file);
-
-// Converts the given simple name of a proto entity to its fully-qualified name
-// in the Java namespace, given that it is in the given file enclosed in the
-// given parent message (or NULL for file-scope entities). Whether the file's
-// outer class name should be included in the return value depends on factors
-// inferrable from the given arguments, including is_class which indicates
-// whether the entity translates to a Java class.
-string ToJavaName(const Params& params, const string& name, bool is_class,
-    const Descriptor* parent, const FileDescriptor* file);
-
-// These return the fully-qualified class name corresponding to the given
-// descriptor.
-inline string ClassName(const Params& params, const Descriptor* descriptor) {
-  return ToJavaName(params, descriptor->name(), true,
-                    descriptor->containing_type(), descriptor->file());
-}
-string ClassName(const Params& params, const EnumDescriptor* descriptor);
-inline string ClassName(const Params& params,
-    const ServiceDescriptor* descriptor) {
-  return ToJavaName(params, descriptor->name(), true, NULL, descriptor->file());
-}
-inline string ExtensionIdentifierName(const Params& params,
-    const FieldDescriptor* descriptor) {
-  return ToJavaName(params, descriptor->name(), false,
-                    descriptor->extension_scope(), descriptor->file());
-}
-string ClassName(const Params& params, const FileDescriptor* descriptor);
-
-// Get the unqualified name that should be used for a field's field
-// number constant.
-string FieldConstantName(const FieldDescriptor *field);
-
-string FieldDefaultConstantName(const FieldDescriptor *field);
-
-// Print the field's proto-syntax definition as a comment.
-void PrintFieldComment(io::Printer* printer, const FieldDescriptor* field);
-
-enum JavaType {
-  JAVATYPE_INT,
-  JAVATYPE_LONG,
-  JAVATYPE_FLOAT,
-  JAVATYPE_DOUBLE,
-  JAVATYPE_BOOLEAN,
-  JAVATYPE_STRING,
-  JAVATYPE_BYTES,
-  JAVATYPE_ENUM,
-  JAVATYPE_MESSAGE
-};
-
-JavaType GetJavaType(FieldDescriptor::Type field_type);
-
-inline JavaType GetJavaType(const FieldDescriptor* field) {
-  return GetJavaType(field->type());
-}
-
-string PrimitiveTypeName(JavaType type);
-
-// Get the fully-qualified class name for a boxed primitive type, e.g.
-// "java.lang.Integer" for JAVATYPE_INT.  Returns NULL for enum and message
-// types.
-string BoxedPrimitiveTypeName(JavaType type);
-
-string EmptyArrayName(const Params& params, const FieldDescriptor* field);
-
-string DefaultValue(const Params& params, const FieldDescriptor* field);
-
-
-// Methods for shared bitfields.
-
-// Gets the name of the shared bitfield for the given field index.
-string GetBitFieldName(int index);
-
-// Gets the name of the shared bitfield for the given bit index.
-// Effectively, GetBitFieldName(bit_index / 32)
-string GetBitFieldNameForBit(int bit_index);
-
-// Generates the java code for the expression that returns whether the bit at
-// the given bit index is set.
-// Example: "((bitField1_ & 0x04000000) != 0)"
-string GenerateGetBit(int bit_index);
-
-// Generates the java code for the expression that sets the bit at the given
-// bit index.
-// Example: "bitField1_ |= 0x04000000"
-string GenerateSetBit(int bit_index);
-
-// Generates the java code for the expression that clears the bit at the given
-// bit index.
-// Example: "bitField1_ = (bitField1_ & ~0x04000000)"
-string GenerateClearBit(int bit_index);
-
-// Generates the java code for the expression that returns whether the bit at
-// the given bit index contains different values in the current object and
-// another object accessible via the variable 'other'.
-// Example: "((bitField1_ & 0x04000000) != (other.bitField1_ & 0x04000000))"
-string GenerateDifferentBit(int bit_index);
-
-// Sets the 'get_*', 'set_*', 'clear_*' and 'different_*' variables, where * is
-// the given name of the bit, to the appropriate Java expressions for the given
-// bit index.
-void SetBitOperationVariables(const string name,
-    int bitIndex, map<string, string>* variables);
-
-inline bool IsMapEntry(const Descriptor* descriptor) {
-  // TODO(liujisi): Add an option to turn on maps for proto2 syntax as well.
-  return descriptor->options().map_entry() &&
-      descriptor->file()->syntax() == FileDescriptor::SYNTAX_PROTO3;
-}
-
-bool HasMapField(const Descriptor* descriptor);
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_HELPERS_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_map_field.cc b/src/google/protobuf/compiler/javanano/javanano_map_field.cc
deleted file mode 100644
index 83b2b0ce..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_map_field.cc
+++ /dev/null
@@ -1,186 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include <google/protobuf/compiler/javanano/javanano_map_field.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-namespace {
-
-string TypeName(const Params& params, const FieldDescriptor* field,
-                bool boxed) {
-  JavaType java_type = GetJavaType(field);
-  switch (java_type) {
-    case JAVATYPE_MESSAGE:
-      return ClassName(params, field->message_type());
-    case JAVATYPE_INT:
-    case JAVATYPE_LONG:
-    case JAVATYPE_FLOAT:
-    case JAVATYPE_DOUBLE:
-    case JAVATYPE_BOOLEAN:
-    case JAVATYPE_STRING:
-    case JAVATYPE_BYTES:
-    case JAVATYPE_ENUM:
-      if (boxed) {
-        return BoxedPrimitiveTypeName(java_type);
-      } else {
-        return PrimitiveTypeName(java_type);
-      }
-    // No default because we want the compiler to complain if any new JavaTypes
-    // are added..
-  }
-
-  GOOGLE_LOG(FATAL) << "should not reach here.";
-  return "";
-}
-
-const FieldDescriptor* KeyField(const FieldDescriptor* descriptor) {
-  GOOGLE_CHECK_EQ(FieldDescriptor::TYPE_MESSAGE, descriptor->type());
-  const Descriptor* message = descriptor->message_type();
-  GOOGLE_CHECK(message->options().map_entry());
-  return message->FindFieldByName("key");
-}
-
-const FieldDescriptor* ValueField(const FieldDescriptor* descriptor) {
-  GOOGLE_CHECK_EQ(FieldDescriptor::TYPE_MESSAGE, descriptor->type());
-  const Descriptor* message = descriptor->message_type();
-  GOOGLE_CHECK(message->options().map_entry());
-  return message->FindFieldByName("value");
-}
-
-void SetMapVariables(const Params& params,
-    const FieldDescriptor* descriptor, map<string, string>* variables) {
-  const FieldDescriptor* key = KeyField(descriptor);
-  const FieldDescriptor* value = ValueField(descriptor);
-  (*variables)["name"] =
-    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  (*variables)["number"] = SimpleItoa(descriptor->number());
-  (*variables)["key_type"] = TypeName(params, key, false);
-  (*variables)["boxed_key_type"] = TypeName(params,key, true);
-  (*variables)["key_desc_type"] =
-      "TYPE_" + ToUpper(FieldDescriptor::TypeName(key->type()));
-  (*variables)["key_tag"] = SimpleItoa(internal::WireFormat::MakeTag(key));
-  (*variables)["value_type"] = TypeName(params, value, false);
-  (*variables)["boxed_value_type"] = TypeName(params, value, true);
-  (*variables)["value_desc_type"] =
-      "TYPE_" + ToUpper(FieldDescriptor::TypeName(value->type()));
-  (*variables)["value_tag"] = SimpleItoa(internal::WireFormat::MakeTag(value));
-  (*variables)["type_parameters"] =
-      (*variables)["boxed_key_type"] + ", " + (*variables)["boxed_value_type"];
-  (*variables)["value_default"] =
-      value->type() == FieldDescriptor::TYPE_MESSAGE
-          ? "new " + (*variables)["value_type"] + "()"
-          : "null";
-}
-}  // namespace
-
-// ===================================================================
-MapFieldGenerator::MapFieldGenerator(const FieldDescriptor* descriptor,
-                                     const Params& params)
-    : FieldGenerator(params), descriptor_(descriptor) {
-  SetMapVariables(params, descriptor, &variables_);
-}
-
-MapFieldGenerator::~MapFieldGenerator() {}
-
-void MapFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_,
-    "public java.util.Map<$type_parameters$> $name$;\n");
-}
-
-void MapFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = null;\n");
-}
-
-void MapFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "this.$name$ = com.google.protobuf.nano.InternalNano.mergeMapEntry(\n"
-    "  input, this.$name$, mapFactory,\n"
-    "  com.google.protobuf.nano.InternalNano.$key_desc_type$,\n"
-    "  com.google.protobuf.nano.InternalNano.$value_desc_type$,\n"
-    "  $value_default$,\n"
-    "  $key_tag$, $value_tag$);\n"
-    "\n");
-}
-
-void MapFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null) {\n"
-    "  com.google.protobuf.nano.InternalNano.serializeMapField(\n"
-    "    output, this.$name$, $number$,\n"
-    "  com.google.protobuf.nano.InternalNano.$key_desc_type$,\n"
-    "  com.google.protobuf.nano.InternalNano.$value_desc_type$);\n"
-    "}\n");
-}
-
-void MapFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null) {\n"
-    "  size += com.google.protobuf.nano.InternalNano.computeMapFieldSize(\n"
-    "    this.$name$, $number$,\n"
-    "  com.google.protobuf.nano.InternalNano.$key_desc_type$,\n"
-    "  com.google.protobuf.nano.InternalNano.$value_desc_type$);\n"
-    "}\n");
-}
-
-void MapFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
-    "  this.$name$, other.$name$)) {\n"
-    "  return false;\n"
-    "}\n");
-}
-
-void MapFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result +\n"
-    "    com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_map_field.h b/src/google/protobuf/compiler/javanano/javanano_map_field.h
deleted file mode 100644
index c01bde38..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_map_field.h
+++ /dev/null
@@ -1,70 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_MAP_FIELD_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_MAP_FIELD_H__
-
-#include <map>
-#include <string>
-#include <vector>
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class MapFieldGenerator : public FieldGenerator {
- public:
-  explicit MapFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~MapFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldGenerator);
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_MAP_FIELD_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_message.cc b/src/google/protobuf/compiler/javanano/javanano_message.cc
deleted file mode 100644
index a41da5ae..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_message.cc
+++ /dev/null
@@ -1,676 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <algorithm>
-#include <google/protobuf/stubs/hash.h>
-#include <google/protobuf/compiler/javanano/javanano_message.h>
-#include <google/protobuf/compiler/javanano/javanano_enum.h>
-#include <google/protobuf/compiler/javanano/javanano_extension.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/wire_format.h>
-#include <google/protobuf/descriptor.pb.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-using internal::WireFormat;
-using internal::WireFormatLite;
-
-namespace {
-
-struct FieldOrderingByNumber {
-  inline bool operator()(const FieldDescriptor* a,
-                         const FieldDescriptor* b) const {
-    return a->number() < b->number();
-  }
-};
-
-// Sort the fields of the given Descriptor by number into a new[]'d array
-// and return it.
-const FieldDescriptor** SortFieldsByNumber(const Descriptor* descriptor) {
-  const FieldDescriptor** fields =
-    new const FieldDescriptor*[descriptor->field_count()];
-  for (int i = 0; i < descriptor->field_count(); i++) {
-    fields[i] = descriptor->field(i);
-  }
-  sort(fields, fields + descriptor->field_count(),
-       FieldOrderingByNumber());
-  return fields;
-}
-
-}  // namespace
-
-// ===================================================================
-
-MessageGenerator::MessageGenerator(const Descriptor* descriptor, const Params& params)
-  : params_(params),
-    descriptor_(descriptor),
-    field_generators_(descriptor, params) {
-}
-
-MessageGenerator::~MessageGenerator() {}
-
-void MessageGenerator::GenerateStaticVariables(io::Printer* printer) {
-  // Generate static members for all nested types.
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-    // TODO(kenton):  Reuse MessageGenerator objects?
-    if (IsMapEntry(descriptor_->nested_type(i))) continue;
-    MessageGenerator(descriptor_->nested_type(i), params_)
-      .GenerateStaticVariables(printer);
-  }
-}
-
-void MessageGenerator::GenerateStaticVariableInitializers(
-    io::Printer* printer) {
-  // Generate static member initializers for all nested types.
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-   // TODO(kenton):  Reuse MessageGenerator objects?
-    if (IsMapEntry(descriptor_->nested_type(i))) continue;
-    MessageGenerator(descriptor_->nested_type(i), params_)
-      .GenerateStaticVariableInitializers(printer);
-  }
-}
-
-void MessageGenerator::Generate(io::Printer* printer) {
-  if (!params_.store_unknown_fields() &&
-      (descriptor_->extension_count() != 0 || descriptor_->extension_range_count() != 0)) {
-    GOOGLE_LOG(FATAL) << "Extensions are only supported in NANO_RUNTIME if the "
-        "'store_unknown_fields' generator option is 'true'\n";
-  }
-
-  const string& file_name = descriptor_->file()->name();
-  bool is_own_file =
-    params_.java_multiple_files(file_name)
-      && descriptor_->containing_type() == NULL;
-
-  if (is_own_file) {
-    // Note: constants (from enums and fields requiring stored defaults, emitted in the loop below)
-    // may have the same names as constants in the nested classes. This causes Java warnings, but
-    // is not fatal, so we suppress those warnings here in the top-most class declaration.
-    printer->Print(
-      "\n"
-      "@SuppressWarnings(\"hiding\")\n"
-      "public final class $classname$ extends\n",
-      "classname", descriptor_->name());
-  } else {
-    printer->Print(
-      "\n"
-      "public static final class $classname$ extends\n",
-      "classname", descriptor_->name());
-  }
-  if (params_.store_unknown_fields() && params_.parcelable_messages()) {
-    printer->Print(
-      "    com.google.protobuf.nano.android.ParcelableExtendableMessageNano<$classname$>",
-      "classname", descriptor_->name());
-  } else if (params_.store_unknown_fields()) {
-    printer->Print(
-      "    com.google.protobuf.nano.ExtendableMessageNano<$classname$>",
-      "classname", descriptor_->name());
-  } else if (params_.parcelable_messages()) {
-    printer->Print(
-      "    com.google.protobuf.nano.android.ParcelableMessageNano");
-  } else {
-    printer->Print(
-      "    com.google.protobuf.nano.MessageNano");
-  }
-  if (params_.generate_clone()) {
-    printer->Print(" implements java.lang.Cloneable {\n");
-  } else {
-    printer->Print(" {\n");
-  }
-  printer->Indent();
-
-  if (params_.parcelable_messages()) {
-    printer->Print(
-      "\n"
-      "// Used by Parcelable\n"
-      "@SuppressWarnings({\"unused\"})\n"
-      "public static final android.os.Parcelable.Creator<$classname$> CREATOR =\n"
-      "    new com.google.protobuf.nano.android.ParcelableMessageNanoCreator<\n"
-      "        $classname$>($classname$.class);\n",
-      "classname", descriptor_->name());
-  }
-
-  // Nested types and extensions
-  for (int i = 0; i < descriptor_->extension_count(); i++) {
-    ExtensionGenerator(descriptor_->extension(i), params_).Generate(printer);
-  }
-
-  for (int i = 0; i < descriptor_->enum_type_count(); i++) {
-    EnumGenerator(descriptor_->enum_type(i), params_).Generate(printer);
-  }
-
-  for (int i = 0; i < descriptor_->nested_type_count(); i++) {
-    if (IsMapEntry(descriptor_->nested_type(i))) continue;
-    MessageGenerator(descriptor_->nested_type(i), params_).Generate(printer);
-  }
-
-  // oneof
-  map<string, string> vars;
-  vars["message_name"] = descriptor_->name();
-  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
-    const OneofDescriptor* oneof_desc = descriptor_->oneof_decl(i);
-    vars["oneof_name"] = UnderscoresToCamelCase(oneof_desc);
-    vars["oneof_capitalized_name"] =
-        UnderscoresToCapitalizedCamelCase(oneof_desc);
-    vars["oneof_index"] = SimpleItoa(oneof_desc->index());
-    // Oneof Constants
-    for (int j = 0; j < oneof_desc->field_count(); j++) {
-      const FieldDescriptor* field = oneof_desc->field(j);
-      vars["number"] = SimpleItoa(field->number());
-      vars["cap_field_name"] = ToUpper(field->name());
-      printer->Print(vars,
-        "public static final int $cap_field_name$_FIELD_NUMBER = $number$;\n");
-    }
-    // oneofCase_ and oneof_
-    printer->Print(vars,
-      "private int $oneof_name$Case_ = 0;\n"
-      "private java.lang.Object $oneof_name$_;\n");
-    printer->Print(vars,
-      "public int get$oneof_capitalized_name$Case() {\n"
-      "  return this.$oneof_name$Case_;\n"
-      "}\n");
-    // Oneof clear
-    printer->Print(vars,
-      "public $message_name$ clear$oneof_capitalized_name$() {\n"
-      "  this.$oneof_name$Case_ = 0;\n"
-      "  this.$oneof_name$_ = null;\n"
-      "  return this;\n"
-      "}\n");
-  }
-
-  // Lazy initialization of otherwise static final fields can help prevent the
-  // class initializer from being generated. We want to prevent it because it
-  // stops ProGuard from inlining any methods in this class into call sites and
-  // therefore reducing the method count. However, extensions are best kept as
-  // public static final fields with initializers, so with their existence we
-  // won't bother with lazy initialization.
-  bool lazy_init = descriptor_->extension_count() == 0;
-
-  // Empty array
-  if (lazy_init) {
-    printer->Print(
-      "\n"
-      "private static volatile $classname$[] _emptyArray;\n"
-      "public static $classname$[] emptyArray() {\n"
-      "  // Lazily initializes the empty array\n"
-      "  if (_emptyArray == null) {\n"
-      "    synchronized (\n"
-      "        com.google.protobuf.nano.InternalNano.LAZY_INIT_LOCK) {\n"
-      "      if (_emptyArray == null) {\n"
-      "        _emptyArray = new $classname$[0];\n"
-      "      }\n"
-      "    }\n"
-      "  }\n"
-      "  return _emptyArray;\n"
-      "}\n",
-      "classname", descriptor_->name());
-  } else {
-    printer->Print(
-      "\n"
-      "private static final $classname$[] EMPTY_ARRAY = {};\n"
-      "public static $classname$[] emptyArray() {\n"
-      "  return EMPTY_ARRAY;\n"
-      "}\n",
-      "classname", descriptor_->name());
-  }
-
-  // Integers for bit fields
-  int totalInts = (field_generators_.total_bits() + 31) / 32;
-  if (totalInts > 0) {
-    printer->Print("\n");
-    for (int i = 0; i < totalInts; i++) {
-      printer->Print("private int $bit_field_name$;\n",
-        "bit_field_name", GetBitFieldName(i));
-    }
-  }
-
-  // Fields and maybe their default values
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    printer->Print("\n");
-    PrintFieldComment(printer, descriptor_->field(i));
-    field_generators_.get(descriptor_->field(i)).GenerateMembers(
-        printer, lazy_init);
-  }
-
-  // Constructor, with lazy init code if needed
-  if (lazy_init && field_generators_.saved_defaults_needed()) {
-    printer->Print(
-      "\n"
-      "private static volatile boolean _classInitialized;\n"
-      "\n"
-      "public $classname$() {\n"
-      "  // Lazily initializes the field defaults\n"
-      "  if (!_classInitialized) {\n"
-      "    synchronized (\n"
-      "        com.google.protobuf.nano.InternalNano.LAZY_INIT_LOCK) {\n"
-      "      if (!_classInitialized) {\n",
-      "classname", descriptor_->name());
-    printer->Indent();
-    printer->Indent();
-    printer->Indent();
-    printer->Indent();
-    for (int i = 0; i < descriptor_->field_count(); i++) {
-      field_generators_.get(descriptor_->field(i))
-          .GenerateInitSavedDefaultCode(printer);
-    }
-    printer->Outdent();
-    printer->Outdent();
-    printer->Outdent();
-    printer->Outdent();
-    printer->Print(
-      "        _classInitialized = true;\n"
-      "      }\n"
-      "    }\n"
-      "  }\n");
-    if (params_.generate_clear()) {
-      printer->Print("  clear();\n");
-    }
-    printer->Print("}\n");
-  } else {
-    printer->Print(
-      "\n"
-      "public $classname$() {\n",
-      "classname", descriptor_->name());
-    if (params_.generate_clear()) {
-      printer->Print("  clear();\n");
-    } else {
-      printer->Indent();
-      GenerateFieldInitializers(printer);
-      printer->Outdent();
-    }
-    printer->Print("}\n");
-  }
-
-  // Other methods in this class
-
-  GenerateClear(printer);
-
-  if (params_.generate_clone()) {
-    GenerateClone(printer);
-  }
-
-  if (params_.generate_equals()) {
-    GenerateEquals(printer);
-    GenerateHashCode(printer);
-  }
-
-  GenerateMessageSerializationMethods(printer);
-  GenerateMergeFromMethods(printer);
-  GenerateParseFromMethods(printer);
-
-  printer->Outdent();
-  printer->Print("}\n");
-}
-
-// ===================================================================
-
-void MessageGenerator::
-GenerateMessageSerializationMethods(io::Printer* printer) {
-  // Rely on the parent implementations of writeTo() and getSerializedSize()
-  // if there are no fields to serialize in this message.
-  if (descriptor_->field_count() == 0) {
-    return;
-  }
-
-  scoped_array<const FieldDescriptor*> sorted_fields(
-    SortFieldsByNumber(descriptor_));
-
-  printer->Print(
-    "\n"
-    "@Override\n"
-    "public void writeTo(com.google.protobuf.nano.CodedOutputByteBufferNano output)\n"
-    "    throws java.io.IOException {\n");
-  printer->Indent();
-
-  // Output the fields in sorted order
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    GenerateSerializeOneField(printer, sorted_fields[i]);
-  }
-
-  // The parent implementation will write any unknown fields if necessary.
-  printer->Print(
-    "super.writeTo(output);\n");
-
-  printer->Outdent();
-  printer->Print("}\n");
-
-  // The parent implementation will get the serialized size for unknown
-  // fields if necessary.
-  printer->Print(
-    "\n"
-    "@Override\n"
-    "protected int computeSerializedSize() {\n"
-    "  int size = super.computeSerializedSize();\n");
-  printer->Indent();
-
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    field_generators_.get(sorted_fields[i]).GenerateSerializedSizeCode(printer);
-  }
-
-  printer->Outdent();
-  printer->Print(
-    "  return size;\n"
-    "}\n");
-}
-
-void MessageGenerator::GenerateMergeFromMethods(io::Printer* printer) {
-  scoped_array<const FieldDescriptor*> sorted_fields(
-    SortFieldsByNumber(descriptor_));
-
-  printer->Print(
-    "\n"
-    "@Override\n"
-    "public $classname$ mergeFrom(\n"
-    "        com.google.protobuf.nano.CodedInputByteBufferNano input)\n"
-    "    throws java.io.IOException {\n",
-    "classname", descriptor_->name());
-
-  printer->Indent();
-  if (HasMapField(descriptor_)) {
-    printer->Print(
-      "com.google.protobuf.nano.MapFactories.MapFactory mapFactory =\n"
-      "  com.google.protobuf.nano.MapFactories.getMapFactory();\n");
-  }
-
-  printer->Print(
-    "while (true) {\n");
-  printer->Indent();
-
-  printer->Print(
-    "int tag = input.readTag();\n"
-    "switch (tag) {\n");
-  printer->Indent();
-
-  printer->Print(
-    "case 0:\n"          // zero signals EOF / limit reached
-    "  return this;\n"
-    "default: {\n");
-
-  printer->Indent();
-  if (params_.store_unknown_fields()) {
-    printer->Print(
-        "if (!storeUnknownField(input, tag)) {\n"
-        "  return this;\n"
-        "}\n");
-  } else {
-    printer->Print(
-        "if (!com.google.protobuf.nano.WireFormatNano.parseUnknownField(input, tag)) {\n"
-        "  return this;\n"   // it's an endgroup tag
-        "}\n");
-  }
-  printer->Print("break;\n");
-  printer->Outdent();
-  printer->Print("}\n");
-
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = sorted_fields[i];
-    uint32 tag = WireFormatLite::MakeTag(field->number(),
-      WireFormat::WireTypeForFieldType(field->type()));
-
-    printer->Print(
-      "case $tag$: {\n",
-      "tag", SimpleItoa(tag));
-    printer->Indent();
-
-    field_generators_.get(field).GenerateMergingCode(printer);
-
-    printer->Outdent();
-    printer->Print(
-      "  break;\n"
-      "}\n");
-
-    if (field->is_packable()) {
-      // To make packed = true wire compatible, we generate parsing code from a
-      // packed version of this field regardless of field->options().packed().
-      uint32 packed_tag = WireFormatLite::MakeTag(field->number(),
-        WireFormatLite::WIRETYPE_LENGTH_DELIMITED);
-      printer->Print(
-        "case $tag$: {\n",
-        "tag", SimpleItoa(packed_tag));
-      printer->Indent();
-
-      field_generators_.get(field).GenerateMergingCodeFromPacked(printer);
-
-      printer->Outdent();
-      printer->Print(
-        "  break;\n"
-        "}\n");
-    }
-  }
-
-  printer->Outdent();
-  printer->Outdent();
-  printer->Outdent();
-  printer->Print(
-    "    }\n"     // switch (tag)
-    "  }\n"       // while (true)
-    "}\n");
-}
-
-void MessageGenerator::
-GenerateParseFromMethods(io::Printer* printer) {
-  // Note:  These are separate from GenerateMessageSerializationMethods()
-  //   because they need to be generated even for messages that are optimized
-  //   for code size.
-  printer->Print(
-    "\n"
-    "public static $classname$ parseFrom(byte[] data)\n"
-    "    throws com.google.protobuf.nano.InvalidProtocolBufferNanoException {\n"
-    "  return com.google.protobuf.nano.MessageNano.mergeFrom(new $classname$(), data);\n"
-    "}\n"
-    "\n"
-    "public static $classname$ parseFrom(\n"
-    "        com.google.protobuf.nano.CodedInputByteBufferNano input)\n"
-    "    throws java.io.IOException {\n"
-    "  return new $classname$().mergeFrom(input);\n"
-    "}\n",
-    "classname", descriptor_->name());
-}
-
-void MessageGenerator::GenerateSerializeOneField(
-    io::Printer* printer, const FieldDescriptor* field) {
-  field_generators_.get(field).GenerateSerializationCode(printer);
-}
-
-void MessageGenerator::GenerateClear(io::Printer* printer) {
-  if (!params_.generate_clear()) {
-    return;
-  }
-  printer->Print(
-    "\n"
-    "public $classname$ clear() {\n",
-    "classname", descriptor_->name());
-  printer->Indent();
-
-  GenerateFieldInitializers(printer);
-
-  printer->Outdent();
-  printer->Print(
-    "  return this;\n"
-    "}\n");
-}
-
-void MessageGenerator::GenerateFieldInitializers(io::Printer* printer) {
-  // Clear bit fields.
-  int totalInts = (field_generators_.total_bits() + 31) / 32;
-  for (int i = 0; i < totalInts; i++) {
-    printer->Print("$bit_field_name$ = 0;\n",
-      "bit_field_name", GetBitFieldName(i));
-  }
-
-  // Call clear for all of the fields.
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = descriptor_->field(i);
-    field_generators_.get(field).GenerateClearCode(printer);
-  }
-
-  // Clear oneofs.
-  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
-    printer->Print(
-      "clear$oneof_capitalized_name$();\n",
-      "oneof_capitalized_name", UnderscoresToCapitalizedCamelCase(
-          descriptor_->oneof_decl(i)));
-  }
-
-  // Clear unknown fields.
-  if (params_.store_unknown_fields()) {
-    printer->Print("unknownFieldData = null;\n");
-  }
-  printer->Print("cachedSize = -1;\n");
-}
-
-void MessageGenerator::GenerateClone(io::Printer* printer) {
-  printer->Print(
-    "@Override\n"
-    "public $classname$ clone() {\n",
-    "classname", descriptor_->name());
-  printer->Indent();
-
-  printer->Print(
-    "$classname$ cloned;\n"
-    "try {\n"
-    "  cloned = ($classname$) super.clone();\n"
-    "} catch (java.lang.CloneNotSupportedException e) {\n"
-    "  throw new java.lang.AssertionError(e);\n"
-    "}\n",
-    "classname", descriptor_->name());
-
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    field_generators_.get(descriptor_->field(i)).GenerateFixClonedCode(printer);
-  }
-
-  printer->Outdent();
-  printer->Print(
-    "  return cloned;\n"
-    "}\n"
-    "\n");
-}
-
-void MessageGenerator::GenerateEquals(io::Printer* printer) {
-  // Don't override if there are no fields. We could generate an
-  // equals method that compares types, but often empty messages
-  // are used as namespaces.
-  if (descriptor_->field_count() == 0 && !params_.store_unknown_fields()) {
-    return;
-  }
-
-  printer->Print(
-    "\n"
-    "@Override\n"
-    "public boolean equals(Object o) {\n");
-  printer->Indent();
-  printer->Print(
-    "if (o == this) {\n"
-    "  return true;\n"
-    "}\n"
-    "if (!(o instanceof $classname$)) {\n"
-    "  return false;\n"
-    "}\n"
-    "$classname$ other = ($classname$) o;\n",
-    "classname", descriptor_->name());
-
-  // Checking oneof case before checking each oneof field.
-  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
-    const OneofDescriptor* oneof_desc = descriptor_->oneof_decl(i);
-    printer->Print(
-      "if (this.$oneof_name$Case_ != other.$oneof_name$Case_) {\n"
-      "  return false;\n"
-      "}\n",
-      "oneof_name", UnderscoresToCamelCase(oneof_desc));
-  }
-
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = descriptor_->field(i);
-    field_generators_.get(field).GenerateEqualsCode(printer);
-  }
-
-  if (params_.store_unknown_fields()) {
-    printer->Print(
-      "if (unknownFieldData == null || unknownFieldData.isEmpty()) {\n"
-      "  return other.unknownFieldData == null || other.unknownFieldData.isEmpty();\n"
-      "} else {\n"
-      "  return unknownFieldData.equals(other.unknownFieldData);\n"
-      "}");
-  } else {
-    printer->Print(
-      "return true;\n");
-  }
-
-  printer->Outdent();
-  printer->Print("}\n");
-}
-
-void MessageGenerator::GenerateHashCode(io::Printer* printer) {
-  if (descriptor_->field_count() == 0 && !params_.store_unknown_fields()) {
-    return;
-  }
-
-  printer->Print(
-    "\n"
-    "@Override\n"
-    "public int hashCode() {\n");
-  printer->Indent();
-
-  printer->Print("int result = 17;\n");
-  printer->Print("result = 31 * result + getClass().getName().hashCode();\n");
-  for (int i = 0; i < descriptor_->field_count(); i++) {
-    const FieldDescriptor* field = descriptor_->field(i);
-    field_generators_.get(field).GenerateHashCodeCode(printer);
-  }
-
-  if (params_.store_unknown_fields()) {
-    printer->Print(
-      "result = 31 * result + \n"
-      "  (unknownFieldData == null || unknownFieldData.isEmpty() ? 0 : \n"
-      "  unknownFieldData.hashCode());\n");
-  }
-
-  printer->Print("return result;\n");
-
-  printer->Outdent();
-  printer->Print("}\n");
-}
-
-// ===================================================================
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_message.h b/src/google/protobuf/compiler/javanano/javanano_message.h
deleted file mode 100644
index 281ec64f..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_message.h
+++ /dev/null
@@ -1,97 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__
-
-#include <string>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/stubs/common.h>
-
-namespace google {
-namespace protobuf {
-  namespace io {
-    class Printer;             // printer.h
-  }
-}
-
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class MessageGenerator {
- public:
-  explicit MessageGenerator(const Descriptor* descriptor, const Params& params);
-  ~MessageGenerator();
-
-  // All static variables have to be declared at the top-level of the file
-  // so that we can control initialization order, which is important for
-  // DescriptorProto bootstrapping to work.
-  void GenerateStaticVariables(io::Printer* printer);
-
-  // Output code which initializes the static variables generated by
-  // GenerateStaticVariables().
-  void GenerateStaticVariableInitializers(io::Printer* printer);
-
-  // Generate the class itself.
-  void Generate(io::Printer* printer);
-
- private:
-  void GenerateMessageSerializationMethods(io::Printer* printer);
-  void GenerateMergeFromMethods(io::Printer* printer);
-  void GenerateParseFromMethods(io::Printer* printer);
-  void GenerateSerializeOneField(io::Printer* printer,
-                                 const FieldDescriptor* field);
-
-  void GenerateClear(io::Printer* printer);
-  void GenerateFieldInitializers(io::Printer* printer);
-  void GenerateEquals(io::Printer* printer);
-  void GenerateHashCode(io::Printer* printer);
-  void GenerateClone(io::Printer* printer);
-
-  const Params& params_;
-  const Descriptor* descriptor_;
-  FieldGeneratorMap field_generators_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageGenerator);
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_message_field.cc b/src/google/protobuf/compiler/javanano/javanano_message_field.cc
deleted file mode 100644
index d1d04b52..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_message_field.cc
+++ /dev/null
@@ -1,363 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <map>
-#include <string>
-
-#include <google/protobuf/compiler/javanano/javanano_message_field.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-using internal::WireFormat;
-using internal::WireFormatLite;
-
-namespace {
-
-// TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
-//   repeat code between this and the other field types.
-void SetMessageVariables(const Params& params,
-    const FieldDescriptor* descriptor, map<string, string>* variables) {
-  (*variables)["name"] =
-    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  (*variables)["capitalized_name"] =
-    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
-  (*variables)["number"] = SimpleItoa(descriptor->number());
-  (*variables)["type"] = ClassName(params, descriptor->message_type());
-  (*variables)["group_or_message"] =
-    (descriptor->type() == FieldDescriptor::TYPE_GROUP) ?
-    "Group" : "Message";
-  (*variables)["message_name"] = descriptor->containing_type()->name();
-  //(*variables)["message_type"] = descriptor->message_type()->name();
-  (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
-}
-
-}  // namespace
-
-// ===================================================================
-
-MessageFieldGenerator::
-MessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetMessageVariables(params, descriptor, &variables_);
-}
-
-MessageFieldGenerator::~MessageFieldGenerator() {}
-
-void MessageFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_,
-    "public $type$ $name$;\n");
-}
-
-void MessageFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = null;\n");
-}
-
-void MessageFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ == null) {\n"
-    "  this.$name$ = new $type$();\n"
-    "}\n");
-
-  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
-    printer->Print(variables_,
-      "input.readGroup(this.$name$, $number$);\n");
-  } else {
-    printer->Print(variables_,
-      "input.readMessage(this.$name$);\n");
-  }
-}
-
-void MessageFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null) {\n"
-    "  output.write$group_or_message$($number$, this.$name$);\n"
-    "}\n");
-}
-
-void MessageFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null) {\n"
-    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "    .compute$group_or_message$Size($number$, this.$name$);\n"
-    "}\n");
-}
-
-void MessageFieldGenerator::
-GenerateFixClonedCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null) {\n"
-    "  cloned.$name$ = this.$name$.clone();\n"
-    "}\n");
-}
-
-void MessageFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ == null) { \n"
-    "  if (other.$name$ != null) {\n"
-    "    return false;\n"
-    "  }\n"
-    "} else {\n"
-    "  if (!this.$name$.equals(other.$name$)) {\n"
-    "    return false;\n"
-    "  }\n"
-    "}\n");
-}
-
-void MessageFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result +\n"
-    "    (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
-}
-// ===================================================================
-
-MessageOneofFieldGenerator::MessageOneofFieldGenerator(
-    const FieldDescriptor* descriptor, const Params& params)
-    : FieldGenerator(params), descriptor_(descriptor) {
-    SetMessageVariables(params, descriptor, &variables_);
-    SetCommonOneofVariables(descriptor, &variables_);
-}
-
-MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {}
-
-void MessageOneofFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_,
-    "public boolean has$capitalized_name$() {\n"
-    "  return $has_oneof_case$;\n"
-    "}\n"
-    "public $type$ get$capitalized_name$() {\n"
-    "  if ($has_oneof_case$) {\n"
-    "    return ($type$) this.$oneof_name$_;\n"
-    "  }\n"
-    "  return null;\n"
-    "}\n"
-    "public $message_name$ set$capitalized_name$($type$ value) {\n"
-    "  if (value == null) { throw new java.lang.NullPointerException(); }\n"
-    "  $set_oneof_case$;\n"
-    "  this.$oneof_name$_ = value;\n"
-    "  return this;\n"
-    "}\n");
-}
-
-void MessageOneofFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  // No clear method for oneof fields.
-}
-
-void MessageOneofFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (!($has_oneof_case$)) {\n"
-    "  this.$oneof_name$_ = new $type$();\n"
-    "}\n"
-    "input.readMessage(\n"
-    "    (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
-    "$set_oneof_case$;\n");
-}
-
-void MessageOneofFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($has_oneof_case$) {\n"
-    "  output.writeMessage($number$,\n"
-    "      (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
-    "}\n");
-}
-
-void MessageOneofFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($has_oneof_case$) {\n"
-    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "    .computeMessageSize($number$,\n"
-    "        (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
-    "}\n");
-}
-
-void MessageOneofFieldGenerator::
-GenerateFixClonedCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$oneof_name$ != null) {\n"
-    "  cloned.$oneof_name$ = this.$oneof_name$.clone();\n"
-    "}\n");
-}
-
-void MessageOneofFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  GenerateOneofFieldEquals(descriptor_, variables_, printer);
-}
-
-void MessageOneofFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  GenerateOneofFieldHashCode(descriptor_, variables_, printer);
-}
-
-// ===================================================================
-
-RepeatedMessageFieldGenerator::RepeatedMessageFieldGenerator(
-    const FieldDescriptor* descriptor, const Params& params)
-    : FieldGenerator(params), descriptor_(descriptor) {
-  SetMessageVariables(params, descriptor, &variables_);
-}
-
-RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}
-
-void RepeatedMessageFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
-  printer->Print(variables_,
-    "public $type$[] $name$;\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = $type$.emptyArray();\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  // First, figure out the length of the array, then parse.
-  printer->Print(variables_,
-    "int arrayLength = com.google.protobuf.nano.WireFormatNano\n"
-    "    .getRepeatedFieldArrayLength(input, $tag$);\n"
-    "int i = this.$name$ == null ? 0 : this.$name$.length;\n"
-    "$type$[] newArray =\n"
-    "    new $type$[i + arrayLength];\n"
-    "if (i != 0) {\n"
-    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
-    "}\n"
-    "for (; i < newArray.length - 1; i++) {\n"
-    "  newArray[i] = new $type$();\n");
-
-  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
-    printer->Print(variables_,
-      "  input.readGroup(newArray[i], $number$);\n");
-  } else {
-    printer->Print(variables_,
-      "  input.readMessage(newArray[i]);\n");
-  }
-
-  printer->Print(variables_,
-    "  input.readTag();\n"
-    "}\n"
-    "// Last one without readTag.\n"
-    "newArray[i] = new $type$();\n");
-
-  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
-    printer->Print(variables_,
-      "input.readGroup(newArray[i], $number$);\n");
-  } else {
-    printer->Print(variables_,
-      "input.readMessage(newArray[i]);\n");
-  }
-
-  printer->Print(variables_,
-    "this.$name$ = newArray;\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n"
-    "  for (int i = 0; i < this.$name$.length; i++) {\n"
-    "    $type$ element = this.$name$[i];\n"
-    "    if (element != null) {\n"
-    "      output.write$group_or_message$($number$, element);\n"
-    "    }\n"
-    "  }\n"
-    "}\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n"
-    "  for (int i = 0; i < this.$name$.length; i++) {\n"
-    "    $type$ element = this.$name$[i];\n"
-    "    if (element != null) {\n"
-    "      size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "        .compute$group_or_message$Size($number$, element);\n"
-    "    }\n"
-    "  }\n"
-    "}\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateFixClonedCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n"
-    "  cloned.$name$ = new $type$[this.$name$.length];\n"
-    "  for (int i = 0; i < this.$name$.length; i++) {\n"
-    "    if (this.$name$[i] != null) {\n"
-    "      cloned.$name$[i] = this.$name$[i].clone();\n"
-    "    }\n"
-    "  }\n"
-    "}\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
-    "    this.$name$, other.$name$)) {\n"
-    "  return false;\n"
-    "}\n");
-}
-
-void RepeatedMessageFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result\n"
-    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_message_field.h b/src/google/protobuf/compiler/javanano/javanano_message_field.h
deleted file mode 100644
index e074735c..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_message_field.h
+++ /dev/null
@@ -1,121 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__
-
-#include <map>
-#include <string>
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class MessageFieldGenerator : public FieldGenerator {
- public:
-  explicit MessageFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~MessageFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-  void GenerateFixClonedCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageFieldGenerator);
-};
-
-class MessageOneofFieldGenerator : public FieldGenerator {
- public:
-  explicit MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
-                                      const Params& params);
-  ~MessageOneofFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-  void GenerateFixClonedCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageOneofFieldGenerator);
-};
-
-class RepeatedMessageFieldGenerator : public FieldGenerator {
- public:
-  explicit RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor,
-        const Params& params);
-  ~RepeatedMessageFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-  void GenerateFixClonedCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedMessageFieldGenerator);
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_MESSAGE_FIELD_H__
diff --git a/src/google/protobuf/compiler/javanano/javanano_params.h b/src/google/protobuf/compiler/javanano/javanano_params.h
deleted file mode 100644
index e3b4bb93..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_params.h
+++ /dev/null
@@ -1,258 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2010 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: wink@google.com (Wink Saville)
-
-#ifndef PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_
-#define PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_
-
-#include <map>
-#include <set>
-#include <google/protobuf/stubs/strutil.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-enum eMultipleFiles { JAVANANO_MUL_UNSET, JAVANANO_MUL_FALSE, JAVANANO_MUL_TRUE };
-
-// Parameters for used by the generators
-class Params {
- public:
-  typedef map<string, string> NameMap;
-  typedef set<string> NameSet;
- private:
-  string empty_;
-  string base_name_;
-  eMultipleFiles override_java_multiple_files_;
-  bool store_unknown_fields_;
-  NameMap java_packages_;
-  NameMap java_outer_classnames_;
-  NameSet java_multiple_files_;
-  bool generate_has_;
-  bool java_enum_style_;
-  bool optional_field_accessors_;
-  bool use_reference_types_for_primitives_;
-  bool generate_equals_;
-  bool ignore_services_;
-  bool parcelable_messages_;
-  bool reftypes_primitive_enums_;
-  bool generate_clear_;
-  bool generate_clone_;
-  bool generate_intdefs_;
-
- public:
-  Params(const string & base_name) :
-    empty_(""),
-    base_name_(base_name),
-    override_java_multiple_files_(JAVANANO_MUL_UNSET),
-    store_unknown_fields_(false),
-    generate_has_(false),
-    java_enum_style_(false),
-    optional_field_accessors_(false),
-    use_reference_types_for_primitives_(false),
-    generate_equals_(false),
-    ignore_services_(false),
-    parcelable_messages_(false),
-    reftypes_primitive_enums_(false),
-    generate_clear_(true),
-    generate_clone_(false),
-    generate_intdefs_(false) {
-  }
-
-  const string& base_name() const {
-    return base_name_;
-  }
-
-  bool has_java_package(const string& file_name) const {
-    return java_packages_.find(file_name)
-                        != java_packages_.end();
-  }
-  void set_java_package(const string& file_name,
-      const string& java_package) {
-    java_packages_[file_name] = java_package;
-  }
-  const string& java_package(const string& file_name) const {
-    NameMap::const_iterator itr;
-
-    itr = java_packages_.find(file_name);
-    if  (itr == java_packages_.end()) {
-      return empty_;
-    } else {
-      return itr->second;
-    }
-  }
-  const NameMap& java_packages() {
-    return java_packages_;
-  }
-
-  bool has_java_outer_classname(const string& file_name) const {
-    return java_outer_classnames_.find(file_name)
-                        != java_outer_classnames_.end();
-  }
-  void set_java_outer_classname(const string& file_name,
-      const string& java_outer_classname) {
-    java_outer_classnames_[file_name] = java_outer_classname;
-  }
-  const string& java_outer_classname(const string& file_name) const {
-    NameMap::const_iterator itr;
-
-    itr = java_outer_classnames_.find(file_name);
-    if  (itr == java_outer_classnames_.end()) {
-      return empty_;
-    } else {
-      return itr->second;
-    }
-  }
-  const NameMap& java_outer_classnames() {
-    return java_outer_classnames_;
-  }
-
-  void set_override_java_multiple_files(bool java_multiple_files) {
-    if (java_multiple_files) {
-      override_java_multiple_files_ = JAVANANO_MUL_TRUE;
-    } else {
-      override_java_multiple_files_ = JAVANANO_MUL_FALSE;
-    }
-  }
-  void clear_override_java_multiple_files() {
-    override_java_multiple_files_ = JAVANANO_MUL_UNSET;
-  }
-
-  void set_java_multiple_files(const string& file_name, bool value) {
-    if (value) {
-      java_multiple_files_.insert(file_name);
-    } else {
-      java_multiple_files_.erase(file_name);
-    }
-  }
-  bool java_multiple_files(const string& file_name) const {
-    switch (override_java_multiple_files_) {
-      case JAVANANO_MUL_FALSE:
-        return false;
-      case JAVANANO_MUL_TRUE:
-        return true;
-      default:
-        return java_multiple_files_.find(file_name)
-                != java_multiple_files_.end();
-    }
-  }
-
-  void set_store_unknown_fields(bool value) {
-    store_unknown_fields_ = value;
-  }
-  bool store_unknown_fields() const {
-    return store_unknown_fields_;
-  }
-
-  void set_generate_has(bool value) {
-    generate_has_ = value;
-  }
-  bool generate_has() const {
-    return generate_has_;
-  }
-
-  void set_java_enum_style(bool value) {
-    java_enum_style_ = value;
-  }
-  bool java_enum_style() const {
-    return java_enum_style_;
-  }
-
-  void set_optional_field_accessors(bool value) {
-    optional_field_accessors_ = value;
-  }
-  bool optional_field_accessors() const {
-    return optional_field_accessors_;
-  }
-
-  void set_use_reference_types_for_primitives(bool value) {
-    use_reference_types_for_primitives_ = value;
-  }
-  bool use_reference_types_for_primitives() const {
-    return use_reference_types_for_primitives_;
-  }
-
-  void set_generate_equals(bool value) {
-    generate_equals_ = value;
-  }
-  bool generate_equals() const {
-    return generate_equals_;
-  }
-
-  void set_ignore_services(bool value) {
-    ignore_services_ = value;
-  }
-  bool ignore_services() const {
-    return ignore_services_;
-  }
-
-  void set_parcelable_messages(bool value) {
-    parcelable_messages_ = value;
-  }
-  bool parcelable_messages() const {
-    return parcelable_messages_;
-  }
-
-  void set_reftypes_primitive_enums(bool value) {
-    reftypes_primitive_enums_ = value;
-  }
-  bool reftypes_primitive_enums() const {
-    return reftypes_primitive_enums_;
-  }
-
-  void set_generate_clear(bool value) {
-    generate_clear_ = value;
-  }
-  bool generate_clear() const {
-    return generate_clear_;
-  }
-
-  void set_generate_clone(bool value) {
-    generate_clone_ = value;
-  }
-  bool generate_clone() const {
-    return generate_clone_;
-  }
-
-  void set_generate_intdefs(bool value) {
-    generate_intdefs_ = value;
-  }
-  bool generate_intdefs() const {
-    return generate_intdefs_;
-  }
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
-#endif  // PROTOBUF_COMPILER_JAVANANO_JAVANANO_PARAMS_H_
diff --git a/src/google/protobuf/compiler/javanano/javanano_primitive_field.cc b/src/google/protobuf/compiler/javanano/javanano_primitive_field.cc
deleted file mode 100644
index 978abf2c..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_primitive_field.cc
+++ /dev/null
@@ -1,968 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#include <map>
-#include <math.h>
-#include <string>
-
-#include <google/protobuf/compiler/javanano/javanano_primitive_field.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/compiler/javanano/javanano_helpers.h>
-#include <google/protobuf/io/printer.h>
-#include <google/protobuf/wire_format.h>
-#include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/stubs/substitute.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-using internal::WireFormat;
-using internal::WireFormatLite;
-
-namespace {
-
-bool IsReferenceType(JavaType type) {
-  switch (type) {
-    case JAVATYPE_INT    : return false;
-    case JAVATYPE_LONG   : return false;
-    case JAVATYPE_FLOAT  : return false;
-    case JAVATYPE_DOUBLE : return false;
-    case JAVATYPE_BOOLEAN: return false;
-    case JAVATYPE_STRING : return true;
-    case JAVATYPE_BYTES  : return true;
-    case JAVATYPE_ENUM   : return false;
-    case JAVATYPE_MESSAGE: return true;
-
-    // No default because we want the compiler to complain if any new
-    // JavaTypes are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return false;
-}
-
-bool IsArrayType(JavaType type) {
-  switch (type) {
-    case JAVATYPE_INT    : return false;
-    case JAVATYPE_LONG   : return false;
-    case JAVATYPE_FLOAT  : return false;
-    case JAVATYPE_DOUBLE : return false;
-    case JAVATYPE_BOOLEAN: return false;
-    case JAVATYPE_STRING : return false;
-    case JAVATYPE_BYTES  : return true;
-    case JAVATYPE_ENUM   : return false;
-    case JAVATYPE_MESSAGE: return false;
-
-    // No default because we want the compiler to complain if any new
-    // JavaTypes are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return false;
-}
-
-const char* GetCapitalizedType(const FieldDescriptor* field) {
-  switch (field->type()) {
-    case FieldDescriptor::TYPE_INT32   : return "Int32"   ;
-    case FieldDescriptor::TYPE_UINT32  : return "UInt32"  ;
-    case FieldDescriptor::TYPE_SINT32  : return "SInt32"  ;
-    case FieldDescriptor::TYPE_FIXED32 : return "Fixed32" ;
-    case FieldDescriptor::TYPE_SFIXED32: return "SFixed32";
-    case FieldDescriptor::TYPE_INT64   : return "Int64"   ;
-    case FieldDescriptor::TYPE_UINT64  : return "UInt64"  ;
-    case FieldDescriptor::TYPE_SINT64  : return "SInt64"  ;
-    case FieldDescriptor::TYPE_FIXED64 : return "Fixed64" ;
-    case FieldDescriptor::TYPE_SFIXED64: return "SFixed64";
-    case FieldDescriptor::TYPE_FLOAT   : return "Float"   ;
-    case FieldDescriptor::TYPE_DOUBLE  : return "Double"  ;
-    case FieldDescriptor::TYPE_BOOL    : return "Bool"    ;
-    case FieldDescriptor::TYPE_STRING  : return "String"  ;
-    case FieldDescriptor::TYPE_BYTES   : return "Bytes"   ;
-    case FieldDescriptor::TYPE_ENUM    : return "Enum"    ;
-    case FieldDescriptor::TYPE_GROUP   : return "Group"   ;
-    case FieldDescriptor::TYPE_MESSAGE : return "Message" ;
-
-    // No default because we want the compiler to complain if any new
-    // types are added.
-  }
-
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return NULL;
-}
-
-// For encodings with fixed sizes, returns that size in bytes.  Otherwise
-// returns -1.
-int FixedSize(FieldDescriptor::Type type) {
-  switch (type) {
-    case FieldDescriptor::TYPE_INT32   : return -1;
-    case FieldDescriptor::TYPE_INT64   : return -1;
-    case FieldDescriptor::TYPE_UINT32  : return -1;
-    case FieldDescriptor::TYPE_UINT64  : return -1;
-    case FieldDescriptor::TYPE_SINT32  : return -1;
-    case FieldDescriptor::TYPE_SINT64  : return -1;
-    case FieldDescriptor::TYPE_FIXED32 : return WireFormatLite::kFixed32Size;
-    case FieldDescriptor::TYPE_FIXED64 : return WireFormatLite::kFixed64Size;
-    case FieldDescriptor::TYPE_SFIXED32: return WireFormatLite::kSFixed32Size;
-    case FieldDescriptor::TYPE_SFIXED64: return WireFormatLite::kSFixed64Size;
-    case FieldDescriptor::TYPE_FLOAT   : return WireFormatLite::kFloatSize;
-    case FieldDescriptor::TYPE_DOUBLE  : return WireFormatLite::kDoubleSize;
-
-    case FieldDescriptor::TYPE_BOOL    : return WireFormatLite::kBoolSize;
-    case FieldDescriptor::TYPE_ENUM    : return -1;
-
-    case FieldDescriptor::TYPE_STRING  : return -1;
-    case FieldDescriptor::TYPE_BYTES   : return -1;
-    case FieldDescriptor::TYPE_GROUP   : return -1;
-    case FieldDescriptor::TYPE_MESSAGE : return -1;
-
-    // No default because we want the compiler to complain if any new
-    // types are added.
-  }
-  GOOGLE_LOG(FATAL) << "Can't get here.";
-  return -1;
-}
-
-bool AllAscii(const string& text) {
-  for (int i = 0; i < text.size(); i++) {
-    if ((text[i] & 0x80) != 0) {
-      return false;
-    }
-  }
-  return true;
-}
-
-
-void SetPrimitiveVariables(const FieldDescriptor* descriptor, const Params params,
-                           map<string, string>* variables) {
-  (*variables)["name"] =
-    RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
-  (*variables)["capitalized_name"] =
-    RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
-  (*variables)["number"] = SimpleItoa(descriptor->number());
-  if (params.use_reference_types_for_primitives()
-      && !descriptor->is_repeated()) {
-    (*variables)["type"] = BoxedPrimitiveTypeName(GetJavaType(descriptor));
-  } else {
-    (*variables)["type"] = PrimitiveTypeName(GetJavaType(descriptor));
-  }
-  // Deals with defaults. For C++-string types (string and bytes),
-  // we might need to have the generated code do the unicode decoding
-  // (see comments in InternalNano.java for gory details.). We would
-  // like to do this once into a static field and re-use that from
-  // then on.
-  if (descriptor->cpp_type() == FieldDescriptor::CPPTYPE_STRING &&
-      !descriptor->default_value_string().empty() &&
-      !params.use_reference_types_for_primitives()) {
-    if (descriptor->type() == FieldDescriptor::TYPE_BYTES) {
-      (*variables)["default"] = DefaultValue(params, descriptor);
-      (*variables)["default_constant"] = FieldDefaultConstantName(descriptor);
-      (*variables)["default_constant_value"] = strings::Substitute(
-          "com.google.protobuf.nano.InternalNano.bytesDefaultValue(\"$0\")",
-          CEscape(descriptor->default_value_string()));
-      (*variables)["default_copy_if_needed"] =
-          (*variables)["default"] + ".clone()";
-    } else if (AllAscii(descriptor->default_value_string())) {
-      // All chars are ASCII.  In this case directly referencing a
-      // CEscape()'d string literal works fine.
-      (*variables)["default"] =
-          "\"" + CEscape(descriptor->default_value_string()) + "\"";
-      (*variables)["default_copy_if_needed"] = (*variables)["default"];
-    } else {
-      // Strings where some chars are non-ASCII. We need to save the
-      // default value.
-      (*variables)["default"] = DefaultValue(params, descriptor);
-      (*variables)["default_constant"] = FieldDefaultConstantName(descriptor);
-      (*variables)["default_constant_value"] = strings::Substitute(
-          "com.google.protobuf.nano.InternalNano.stringDefaultValue(\"$0\")",
-          CEscape(descriptor->default_value_string()));
-      (*variables)["default_copy_if_needed"] = (*variables)["default"];
-    }
-  } else {
-    // Non-string, non-bytes field. Defaults are literals.
-    (*variables)["default"] = DefaultValue(params, descriptor);
-    (*variables)["default_copy_if_needed"] = (*variables)["default"];
-  }
-  (*variables)["boxed_type"] = BoxedPrimitiveTypeName(GetJavaType(descriptor));
-  (*variables)["capitalized_type"] = GetCapitalizedType(descriptor);
-  (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
-  (*variables)["tag_size"] = SimpleItoa(
-      WireFormat::TagSize(descriptor->number(), descriptor->type()));
-  (*variables)["non_packed_tag"] = SimpleItoa(
-      internal::WireFormatLite::MakeTag(descriptor->number(),
-          internal::WireFormat::WireTypeForFieldType(descriptor->type())));
-  int fixed_size = FixedSize(descriptor->type());
-  if (fixed_size != -1) {
-    (*variables)["fixed_size"] = SimpleItoa(fixed_size);
-  }
-  (*variables)["message_name"] = descriptor->containing_type()->name();
-  (*variables)["empty_array_name"] = EmptyArrayName(params, descriptor);
-}
-}  // namespace
-
-// ===================================================================
-
-PrimitiveFieldGenerator::
-PrimitiveFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetPrimitiveVariables(descriptor, params, &variables_);
-}
-
-PrimitiveFieldGenerator::~PrimitiveFieldGenerator() {}
-
-bool PrimitiveFieldGenerator::SavedDefaultNeeded() const {
-  return variables_.find("default_constant") != variables_.end();
-}
-
-void PrimitiveFieldGenerator::GenerateInitSavedDefaultCode(io::Printer* printer) const {
-  if (variables_.find("default_constant") != variables_.end()) {
-    printer->Print(variables_,
-      "$default_constant$ = $default_constant_value$;\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateMembers(io::Printer* printer, bool lazy_init) const {
-  if (variables_.find("default_constant") != variables_.end()) {
-    // Those primitive types that need a saved default.
-    if (lazy_init) {
-      printer->Print(variables_,
-        "private static $type$ $default_constant$;\n");
-    } else {
-      printer->Print(variables_,
-        "private static final $type$ $default_constant$ =\n"
-        "    $default_constant_value$;\n");
-    }
-  }
-
-  printer->Print(variables_,
-    "public $type$ $name$;\n");
-
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "public boolean has$capitalized_name$;\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = $default_copy_if_needed$;\n");
-
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "has$capitalized_name$ = false;\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "this.$name$ = input.read$capitalized_type$();\n");
-
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "has$capitalized_name$ = true;\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateSerializationConditional(io::Printer* printer) const {
-  if (params_.use_reference_types_for_primitives()) {
-    // For reference type mode, serialize based on equality
-    // to null.
-    printer->Print(variables_,
-      "if (this.$name$ != null) {\n");
-    return;
-  }
-  if (params_.generate_has()) {
-    printer->Print(variables_,
-      "if (has$capitalized_name$ || ");
-  } else {
-    printer->Print(variables_,
-      "if (");
-  }
-  JavaType java_type = GetJavaType(descriptor_);
-  if (IsArrayType(java_type)) {
-    printer->Print(variables_,
-      "!java.util.Arrays.equals(this.$name$, $default$)) {\n");
-  } else if (IsReferenceType(java_type)) {
-    printer->Print(variables_,
-      "!this.$name$.equals($default$)) {\n");
-  } else if (java_type == JAVATYPE_FLOAT) {
-    printer->Print(variables_,
-      "java.lang.Float.floatToIntBits(this.$name$)\n"
-      "    != java.lang.Float.floatToIntBits($default$)) {\n");
-  } else if (java_type == JAVATYPE_DOUBLE) {
-    printer->Print(variables_,
-      "java.lang.Double.doubleToLongBits(this.$name$)\n"
-      "    != java.lang.Double.doubleToLongBits($default$)) {\n");
-  } else {
-    printer->Print(variables_,
-      "this.$name$ != $default$) {\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  if (descriptor_->is_required() && !params_.generate_has()) {
-    // Always serialize a required field if we don't have the 'has' signal.
-    printer->Print(variables_,
-      "output.write$capitalized_type$($number$, this.$name$);\n");
-  } else {
-    GenerateSerializationConditional(printer);
-    printer->Print(variables_,
-      "  output.write$capitalized_type$($number$, this.$name$);\n"
-      "}\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  if (descriptor_->is_required() && !params_.generate_has()) {
-    printer->Print(variables_,
-      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "    .compute$capitalized_type$Size($number$, this.$name$);\n");
-  } else {
-    GenerateSerializationConditional(printer);
-    printer->Print(variables_,
-      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "      .compute$capitalized_type$Size($number$, this.$name$);\n"
-      "}\n");
-  }
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateFixClonedCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n"
-    "  cloned.$name$ = this.$name$.clone();\n"
-    "}\n");
-}
-
-void PrimitiveFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  // We define equality as serialized form equality. If generate_has(),
-  // then if the field value equals the default value in both messages,
-  // but one's 'has' field is set and the other's is not, the serialized
-  // forms are different and we should return false.
-  JavaType java_type = GetJavaType(descriptor_);
-  if (java_type == JAVATYPE_BYTES) {
-    printer->Print(variables_,
-      "if (!java.util.Arrays.equals(this.$name$, other.$name$)");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "    || (java.util.Arrays.equals(this.$name$, $default$)\n"
-        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "  return false;\n"
-      "}\n");
-  } else if (java_type == JAVATYPE_STRING
-      || params_.use_reference_types_for_primitives()) {
-    printer->Print(variables_,
-      "if (this.$name$ == null) {\n"
-      "  if (other.$name$ != null) {\n"
-      "    return false;\n"
-      "  }\n"
-      "} else if (!this.$name$.equals(other.$name$)");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "    || (this.$name$.equals($default$)\n"
-        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "  return false;\n"
-      "}\n");
-  } else if (java_type == JAVATYPE_FLOAT) {
-    printer->Print(variables_,
-      "{\n"
-      "  int bits = java.lang.Float.floatToIntBits(this.$name$);\n"
-      "  if (bits != java.lang.Float.floatToIntBits(other.$name$)");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "      || (bits == java.lang.Float.floatToIntBits($default$)\n"
-        "          && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "    return false;\n"
-      "  }\n"
-      "}\n");
-  } else if (java_type == JAVATYPE_DOUBLE) {
-    printer->Print(variables_,
-      "{\n"
-      "  long bits = java.lang.Double.doubleToLongBits(this.$name$);\n"
-      "  if (bits != java.lang.Double.doubleToLongBits(other.$name$)");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "      || (bits == java.lang.Double.doubleToLongBits($default$)\n"
-        "          && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "    return false;\n"
-      "  }\n"
-      "}\n");
-  } else {
-    printer->Print(variables_,
-      "if (this.$name$ != other.$name$");
-    if (params_.generate_has()) {
-      printer->Print(variables_,
-        "\n"
-        "    || (this.$name$ == $default$\n"
-        "        && this.has$capitalized_name$ != other.has$capitalized_name$)");
-    }
-    printer->Print(") {\n"
-      "  return false;\n"
-      "}\n");
-  }
-}
-
-void PrimitiveFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  JavaType java_type = GetJavaType(descriptor_);
-  if (java_type == JAVATYPE_BYTES) {
-    printer->Print(variables_,
-      "result = 31 * result + java.util.Arrays.hashCode(this.$name$);\n");
-  } else if (java_type == JAVATYPE_STRING
-      || params_.use_reference_types_for_primitives()) {
-    printer->Print(variables_,
-      "result = 31 * result\n"
-      "    + (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
-  } else {
-    switch (java_type) {
-      // For all Java primitive types below, the hash codes match the
-      // results of BoxedType.valueOf(primitiveValue).hashCode().
-      case JAVATYPE_INT:
-        printer->Print(variables_,
-          "result = 31 * result + this.$name$;\n");
-        break;
-      case JAVATYPE_LONG:
-        printer->Print(variables_,
-          "result = 31 * result\n"
-          "    + (int) (this.$name$ ^ (this.$name$ >>> 32));\n");
-        break;
-      case JAVATYPE_FLOAT:
-        printer->Print(variables_,
-          "result = 31 * result\n"
-          "    + java.lang.Float.floatToIntBits(this.$name$);\n");
-        break;
-      case JAVATYPE_DOUBLE:
-        printer->Print(variables_,
-          "{\n"
-          "  long v = java.lang.Double.doubleToLongBits(this.$name$);\n"
-          "  result = 31 * result + (int) (v ^ (v >>> 32));\n"
-          "}\n");
-        break;
-      case JAVATYPE_BOOLEAN:
-        printer->Print(variables_,
-          "result = 31 * result + (this.$name$ ? 1231 : 1237);\n");
-        break;
-      default:
-        GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
-        break;
-    }
-  }
-}
-
-// ===================================================================
-
-AccessorPrimitiveFieldGenerator::
-AccessorPrimitiveFieldGenerator(const FieldDescriptor* descriptor,
-     const Params& params, int has_bit_index)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetPrimitiveVariables(descriptor, params, &variables_);
-  SetBitOperationVariables("has", has_bit_index, &variables_);
-}
-
-AccessorPrimitiveFieldGenerator::~AccessorPrimitiveFieldGenerator() {}
-
-bool AccessorPrimitiveFieldGenerator::SavedDefaultNeeded() const {
-  return variables_.find("default_constant") != variables_.end();
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateInitSavedDefaultCode(io::Printer* printer) const {
-  if (variables_.find("default_constant") != variables_.end()) {
-    printer->Print(variables_,
-      "$default_constant$ = $default_constant_value$;\n");
-  }
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateMembers(io::Printer* printer, bool lazy_init) const {
-  if (variables_.find("default_constant") != variables_.end()) {
-    // Those primitive types that need a saved default.
-    if (lazy_init) {
-      printer->Print(variables_,
-        "private static $type$ $default_constant$;\n");
-    } else {
-      printer->Print(variables_,
-        "private static final $type$ $default_constant$ =\n"
-        "    $default_constant_value$;\n");
-    }
-  }
-  printer->Print(variables_,
-    "private $type$ $name$_;\n"
-    "public $type$ get$capitalized_name$() {\n"
-    "  return $name$_;\n"
-    "}\n"
-    "public $message_name$ set$capitalized_name$($type$ value) {\n");
-  if (IsReferenceType(GetJavaType(descriptor_))) {
-    printer->Print(variables_,
-      "  if (value == null) {\n"
-      "    throw new java.lang.NullPointerException();\n"
-      "  }\n");
-  }
-  printer->Print(variables_,
-    "  $name$_ = value;\n"
-    "  $set_has$;\n"
-    "  return this;\n"
-    "}\n"
-    "public boolean has$capitalized_name$() {\n"
-    "  return $get_has$;\n"
-    "}\n"
-    "public $message_name$ clear$capitalized_name$() {\n"
-    "  $name$_ = $default_copy_if_needed$;\n"
-    "  $clear_has$;\n"
-    "  return this;\n"
-    "}\n");
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$_ = $default_copy_if_needed$;\n");
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$_ = input.read$capitalized_type$();\n"
-    "$set_has$;\n");
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($get_has$) {\n"
-    "  output.write$capitalized_type$($number$, $name$_);\n"
-    "}\n");
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($get_has$) {\n"
-    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "      .compute$capitalized_type$Size($number$, $name$_);\n"
-    "}\n");
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  switch (GetJavaType(descriptor_)) {
-    // For all Java primitive types below, the equality checks match the
-    // results of BoxedType.valueOf(primitiveValue).equals(otherValue).
-    case JAVATYPE_FLOAT:
-      printer->Print(variables_,
-        "if ($different_has$\n"
-        "    || java.lang.Float.floatToIntBits($name$_)\n"
-        "        != java.lang.Float.floatToIntBits(other.$name$_)) {\n"
-        "  return false;\n"
-        "}\n");
-      break;
-    case JAVATYPE_DOUBLE:
-      printer->Print(variables_,
-        "if ($different_has$\n"
-        "    || java.lang.Double.doubleToLongBits($name$_)\n"
-        "        != java.lang.Double.doubleToLongBits(other.$name$_)) {\n"
-        "  return false;\n"
-        "}\n");
-      break;
-    case JAVATYPE_INT:
-    case JAVATYPE_LONG:
-    case JAVATYPE_BOOLEAN:
-      printer->Print(variables_,
-        "if ($different_has$\n"
-        "    || $name$_ != other.$name$_) {\n"
-        "  return false;\n"
-        "}\n");
-      break;
-    case JAVATYPE_STRING:
-      // Accessor style would guarantee $name$_ non-null
-      printer->Print(variables_,
-        "if ($different_has$\n"
-        "    || !$name$_.equals(other.$name$_)) {\n"
-        "  return false;\n"
-        "}\n");
-      break;
-    case JAVATYPE_BYTES:
-      // Accessor style would guarantee $name$_ non-null
-      printer->Print(variables_,
-        "if ($different_has$\n"
-        "    || !java.util.Arrays.equals($name$_, other.$name$_)) {\n"
-        "  return false;\n"
-        "}\n");
-      break;
-    default:
-      GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
-      break;
-  }
-}
-
-void AccessorPrimitiveFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  switch (GetJavaType(descriptor_)) {
-    // For all Java primitive types below, the hash codes match the
-    // results of BoxedType.valueOf(primitiveValue).hashCode().
-    case JAVATYPE_INT:
-      printer->Print(variables_,
-        "result = 31 * result + $name$_;\n");
-      break;
-    case JAVATYPE_LONG:
-      printer->Print(variables_,
-        "result = 31 * result + (int) ($name$_ ^ ($name$_ >>> 32));\n");
-      break;
-    case JAVATYPE_FLOAT:
-      printer->Print(variables_,
-        "result = 31 * result +\n"
-        "    java.lang.Float.floatToIntBits($name$_);\n");
-      break;
-    case JAVATYPE_DOUBLE:
-      printer->Print(variables_,
-        "{\n"
-        "  long v = java.lang.Double.doubleToLongBits($name$_);\n"
-        "  result = 31 * result + (int) (v ^ (v >>> 32));\n"
-        "}\n");
-      break;
-    case JAVATYPE_BOOLEAN:
-      printer->Print(variables_,
-        "result = 31 * result + ($name$_ ? 1231 : 1237);\n");
-      break;
-    case JAVATYPE_STRING:
-      // Accessor style would guarantee $name$_ non-null
-      printer->Print(variables_,
-        "result = 31 * result + $name$_.hashCode();\n");
-      break;
-    case JAVATYPE_BYTES:
-      // Accessor style would guarantee $name$_ non-null
-      printer->Print(variables_,
-        "result = 31 * result + java.util.Arrays.hashCode($name$_);\n");
-      break;
-    default:
-      GOOGLE_LOG(ERROR) << "unknown java type for primitive field";
-      break;
-  }
-}
-
-// ===================================================================
-
-PrimitiveOneofFieldGenerator::PrimitiveOneofFieldGenerator(
-    const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-    SetPrimitiveVariables(descriptor, params, &variables_);
-    SetCommonOneofVariables(descriptor, &variables_);
-}
-
-PrimitiveOneofFieldGenerator::~PrimitiveOneofFieldGenerator() {}
-
-void PrimitiveOneofFieldGenerator::GenerateMembers(
-    io::Printer* printer, bool /*unused lazy_init*/) const {
-  printer->Print(variables_,
-    "public boolean has$capitalized_name$() {\n"
-    "  return $has_oneof_case$;\n"
-    "}\n"
-    "public $type$ get$capitalized_name$() {\n"
-    "  if ($has_oneof_case$) {\n"
-    "    return ($type$) ($boxed_type$) this.$oneof_name$_;\n"
-    "  }\n"
-    "  return $default$;\n"
-    "}\n"
-    "public $message_name$ set$capitalized_name$($type$ value) {\n"
-    "  $set_oneof_case$;\n"
-    "  this.$oneof_name$_ = value;\n"
-    "  return this;\n"
-    "}\n");
-}
-
-void PrimitiveOneofFieldGenerator::GenerateClearCode(
-    io::Printer* printer) const {
-  // No clear method for oneof fields.
-}
-
-void PrimitiveOneofFieldGenerator::GenerateMergingCode(
-    io::Printer* printer) const {
-  printer->Print(variables_,
-    "this.$oneof_name$_ = input.read$capitalized_type$();\n"
-    "$set_oneof_case$;\n");
-}
-
-void PrimitiveOneofFieldGenerator::GenerateSerializationCode(
-    io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($has_oneof_case$) {\n"
-    "  output.write$capitalized_type$(\n"
-    "      $number$, ($boxed_type$) this.$oneof_name$_);\n"
-    "}\n");
-}
-
-void PrimitiveOneofFieldGenerator::GenerateSerializedSizeCode(
-    io::Printer* printer) const {
-  printer->Print(variables_,
-    "if ($has_oneof_case$) {\n"
-    "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-    "      .compute$capitalized_type$Size(\n"
-    "          $number$, ($boxed_type$) this.$oneof_name$_);\n"
-    "}\n");
-}
-
-void PrimitiveOneofFieldGenerator::GenerateEqualsCode(
-    io::Printer* printer) const {
-  GenerateOneofFieldEquals(descriptor_, variables_, printer);
-}
-
-void PrimitiveOneofFieldGenerator::GenerateHashCodeCode(
-    io::Printer* printer) const {
-  GenerateOneofFieldHashCode(descriptor_, variables_, printer);
-}
-
-// ===================================================================
-
-RepeatedPrimitiveFieldGenerator::RepeatedPrimitiveFieldGenerator(
-    const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
-  SetPrimitiveVariables(descriptor, params, &variables_);
-}
-
-RepeatedPrimitiveFieldGenerator::~RepeatedPrimitiveFieldGenerator() {}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateMembers(io::Printer* printer, bool /*unused init_defaults*/) const {
-  printer->Print(variables_,
-    "public $type$[] $name$;\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateClearCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "$name$ = $default$;\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateMergingCode(io::Printer* printer) const {
-  // First, figure out the length of the array, then parse.
-  printer->Print(variables_,
-    "int arrayLength = com.google.protobuf.nano.WireFormatNano\n"
-    "    .getRepeatedFieldArrayLength(input, $non_packed_tag$);\n"
-    "int i = this.$name$ == null ? 0 : this.$name$.length;\n");
-
-  if (GetJavaType(descriptor_) == JAVATYPE_BYTES) {
-    printer->Print(variables_,
-      "byte[][] newArray = new byte[i + arrayLength][];\n");
-  } else {
-    printer->Print(variables_,
-      "$type$[] newArray = new $type$[i + arrayLength];\n");
-  }
-  printer->Print(variables_,
-    "if (i != 0) {\n"
-    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
-    "}\n"
-    "for (; i < newArray.length - 1; i++) {\n"
-    "  newArray[i] = input.read$capitalized_type$();\n"
-    "  input.readTag();\n"
-    "}\n"
-    "// Last one without readTag.\n"
-    "newArray[i] = input.read$capitalized_type$();\n"
-    "this.$name$ = newArray;\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateMergingCodeFromPacked(io::Printer* printer) const {
-  printer->Print(
-    "int length = input.readRawVarint32();\n"
-    "int limit = input.pushLimit(length);\n");
-
-  // If we know the elements will all be of the same size, the arrayLength
-  // can be calculated much more easily. However, FixedSize() returns 1 for
-  // repeated bool fields, which are guaranteed to have the fixed size of
-  // 1 byte per value only if we control the output. On the wire they can
-  // legally appear as variable-size integers, so we need to use the slow
-  // way for repeated bool fields.
-  if (descriptor_->type() == FieldDescriptor::TYPE_BOOL
-      || FixedSize(descriptor_->type()) == -1) {
-    printer->Print(variables_,
-      "// First pass to compute array length.\n"
-      "int arrayLength = 0;\n"
-      "int startPos = input.getPosition();\n"
-      "while (input.getBytesUntilLimit() > 0) {\n"
-      "  input.read$capitalized_type$();\n"
-      "  arrayLength++;\n"
-      "}\n"
-      "input.rewindToPosition(startPos);\n");
-  } else {
-    printer->Print(variables_,
-      "int arrayLength = length / $fixed_size$;\n");
-  }
-
-  printer->Print(variables_,
-    "int i = this.$name$ == null ? 0 : this.$name$.length;\n"
-    "$type$[] newArray = new $type$[i + arrayLength];\n"
-    "if (i != 0) {\n"
-    "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
-    "}\n"
-    "for (; i < newArray.length; i++) {\n"
-    "  newArray[i] = input.read$capitalized_type$();\n"
-    "}\n"
-    "this.$name$ = newArray;\n"
-    "input.popLimit(limit);\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateRepeatedDataSizeCode(io::Printer* printer) const {
-  // Creates a variable dataSize and puts the serialized size in there.
-  // If the element type is a Java reference type, also generates
-  // dataCount which stores the number of non-null elements in the field.
-  if (IsReferenceType(GetJavaType(descriptor_))) {
-    printer->Print(variables_,
-      "int dataCount = 0;\n"
-      "int dataSize = 0;\n"
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  $type$ element = this.$name$[i];\n"
-      "  if (element != null) {\n"
-      "    dataCount++;\n"
-      "    dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "        .compute$capitalized_type$SizeNoTag(element);\n"
-      "  }\n"
-      "}\n");
-  } else if (FixedSize(descriptor_->type()) == -1) {
-    printer->Print(variables_,
-      "int dataSize = 0;\n"
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  $type$ element = this.$name$[i];\n"
-      "  dataSize += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "      .compute$capitalized_type$SizeNoTag(element);\n"
-      "}\n");
-  } else {
-    printer->Print(variables_,
-      "int dataSize = $fixed_size$ * this.$name$.length;\n");
-  }
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateSerializationCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n");
-  printer->Indent();
-
-  if (descriptor_->is_packable() && descriptor_->options().packed()) {
-    GenerateRepeatedDataSizeCode(printer);
-    printer->Print(variables_,
-      "output.writeRawVarint32($tag$);\n"
-      "output.writeRawVarint32(dataSize);\n"
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  output.write$capitalized_type$NoTag(this.$name$[i]);\n"
-      "}\n");
-  } else if (IsReferenceType(GetJavaType(descriptor_))) {
-    printer->Print(variables_,
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  $type$ element = this.$name$[i];\n"
-      "  if (element != null) {\n"
-      "    output.write$capitalized_type$($number$, element);\n"
-      "  }\n"
-      "}\n");
-  } else {
-    printer->Print(variables_,
-      "for (int i = 0; i < this.$name$.length; i++) {\n"
-      "  output.write$capitalized_type$($number$, this.$name$[i]);\n"
-      "}\n");
-  }
-
-  printer->Outdent();
-  printer->Print("}\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateSerializedSizeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (this.$name$ != null && this.$name$.length > 0) {\n");
-  printer->Indent();
-
-  GenerateRepeatedDataSizeCode(printer);
-
-  printer->Print(
-    "size += dataSize;\n");
-  if (descriptor_->is_packable() && descriptor_->options().packed()) {
-    printer->Print(variables_,
-      "size += $tag_size$;\n"
-      "size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
-      "    .computeRawVarint32Size(dataSize);\n");
-  } else if (IsReferenceType(GetJavaType(descriptor_))) {
-    printer->Print(variables_,
-      "size += $tag_size$ * dataCount;\n");
-  } else {
-    printer->Print(variables_,
-      "size += $tag_size$ * this.$name$.length;\n");
-  }
-
-  printer->Outdent();
-
-  printer->Print(
-    "}\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateEqualsCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "if (!com.google.protobuf.nano.InternalNano.equals(\n"
-    "    this.$name$, other.$name$)) {\n"
-    "  return false;\n"
-    "}\n");
-}
-
-void RepeatedPrimitiveFieldGenerator::
-GenerateHashCodeCode(io::Printer* printer) const {
-  printer->Print(variables_,
-    "result = 31 * result\n"
-    "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
-}
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/compiler/javanano/javanano_primitive_field.h b/src/google/protobuf/compiler/javanano/javanano_primitive_field.h
deleted file mode 100644
index a01981dd..00000000
--- a/src/google/protobuf/compiler/javanano/javanano_primitive_field.h
+++ /dev/null
@@ -1,150 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__
-
-#include <map>
-#include <string>
-#include <google/protobuf/compiler/javanano/javanano_field.h>
-
-namespace google {
-namespace protobuf {
-namespace compiler {
-namespace javanano {
-
-class PrimitiveFieldGenerator : public FieldGenerator {
- public:
-  explicit PrimitiveFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~PrimitiveFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  bool SavedDefaultNeeded() const;
-  void GenerateInitSavedDefaultCode(io::Printer* printer) const;
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  void GenerateSerializationConditional(io::Printer* printer) const;
-
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveFieldGenerator);
-};
-
-class AccessorPrimitiveFieldGenerator : public FieldGenerator {
- public:
-  explicit AccessorPrimitiveFieldGenerator(const FieldDescriptor* descriptor,
-      const Params &params, int has_bit_index);
-  ~AccessorPrimitiveFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  bool SavedDefaultNeeded() const;
-  void GenerateInitSavedDefaultCode(io::Printer* printer) const;
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(AccessorPrimitiveFieldGenerator);
-};
-
-class PrimitiveOneofFieldGenerator : public FieldGenerator {
- public:
-  explicit PrimitiveOneofFieldGenerator(
-      const FieldDescriptor* descriptor, const Params& params);
-  ~PrimitiveOneofFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-
- private:
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveOneofFieldGenerator);
-};
-
-class RepeatedPrimitiveFieldGenerator : public FieldGenerator {
- public:
-  explicit RepeatedPrimitiveFieldGenerator(const FieldDescriptor* descriptor,
-                                           const Params& params);
-  ~RepeatedPrimitiveFieldGenerator();
-
-  // implements FieldGenerator ---------------------------------------
-  void GenerateMembers(io::Printer* printer, bool lazy_init) const;
-  void GenerateClearCode(io::Printer* printer) const;
-  void GenerateMergingCode(io::Printer* printer) const;
-  void GenerateMergingCodeFromPacked(io::Printer* printer) const;
-  void GenerateSerializationCode(io::Printer* printer) const;
-  void GenerateSerializedSizeCode(io::Printer* printer) const;
-  void GenerateEqualsCode(io::Printer* printer) const;
-  void GenerateHashCodeCode(io::Printer* printer) const;
-  void GenerateFixClonedCode(io::Printer* printer) const;
-
- private:
-  void GenerateRepeatedDataSizeCode(io::Printer* printer) const;
-
-  const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedPrimitiveFieldGenerator);
-};
-
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_PRIMITIVE_FIELD_H__
diff --git a/src/google/protobuf/compiler/js/embed.cc b/src/google/protobuf/compiler/js/embed.cc
deleted file mode 100644
index 57d38237..00000000
--- a/src/google/protobuf/compiler/js/embed.cc
+++ /dev/null
@@ -1,112 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include <cassert>
-#include <cstdlib>
-#include <fstream>
-#include <iostream>
-#include <string>
-
-const char output_file[] = "well_known_types_embed.cc";
-
-static bool AsciiIsPrint(unsigned char c) {
-  return c >= 32 && c < 127;
-}
-
-static char ToDecimalDigit(int num) {
-  assert(num < 10);
-  return '0' + num;
-}
-
-static std::string CEscape(const std::string& str) {
-  std::string dest;
-
-  for (size_t i = 0; i < str.size(); ++i) {
-    unsigned char ch = str[i];
-    switch (ch) {
-      case '\n': dest += "\\n"; break;
-      case '\r': dest += "\\r"; break;
-      case '\t': dest += "\\t"; break;
-      case '\"': dest += "\\\""; break;
-      case '\\': dest += "\\\\"; break;
-      default:
-        if (AsciiIsPrint(ch)) {
-          dest += ch;
-        } else {
-          dest += "\\";
-          dest += ToDecimalDigit(ch / 64);
-          dest += ToDecimalDigit((ch % 64) / 8);
-          dest += ToDecimalDigit(ch % 8);
-        }
-        break;
-    }
-  }
-
-  return dest;
-}
-
-static void AddFile(const char* name, std::basic_ostream<char>* out) {
-  std::ifstream in(name);
-
-  if (!in.is_open()) {
-    std::cerr << "Couldn't open input file: " << name << "\n";
-    std::exit(EXIT_FAILURE);
-  }
-
-  // Make canonical name only include the final element.
-  for (const char *p = name; *p; p++) {
-    if (*p == '/') {
-      name = p + 1;
-    }
-  }
-
-  *out << "{\"" << CEscape(name) << "\",\n";
-
-  for (std::string line; std::getline(in, line); ) {
-    *out << "  \"" << CEscape(line) << "\\n\"\n";
-  }
-
-  *out << "},\n";
-}
-
-int main(int argc, char *argv[]) {
-  std::cout << "#include "
-               "<google/protobuf/compiler/js/well_known_types_embed.h>\n";
-  std::cout << "struct FileToc well_known_types_js[] = {\n";
-
-  for (int i = 1; i < argc; i++) {
-    AddFile(argv[i], &std::cout);
-  }
-
-  std::cout << "  {NULL, NULL}  // Terminate the list.\n";
-  std::cout << "};\n";
-
-  return EXIT_SUCCESS;
-}
diff --git a/src/google/protobuf/compiler/js/js_generator.cc b/src/google/protobuf/compiler/js/js_generator.cc
index 727ed090..d8282e40 100755
--- a/src/google/protobuf/compiler/js/js_generator.cc
+++ b/src/google/protobuf/compiler/js/js_generator.cc
@@ -35,9 +35,6 @@
 #include <limits>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <utility>
 #include <vector>
@@ -52,6 +49,7 @@
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/stubs/strutil.h>
 
+
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -143,12 +141,16 @@ bool IsReserved(const string& ident) {
   return false;
 }
 
+bool StrEndsWith(StringPiece sp, StringPiece x) {
+  return sp.size() >= x.size() && sp.substr(sp.size() - x.size()) == x;
+}
+
 // Returns a copy of |filename| with any trailing ".protodevel" or ".proto
 // suffix stripped.
 // TODO(haberman): Unify with copy in compiler/cpp/internal/helpers.cc.
 string StripProto(const string& filename) {
-  const char* suffix = HasSuffixString(filename, ".protodevel")
-      ? ".protodevel" : ".proto";
+  const char* suffix =
+      StrEndsWith(filename, ".protodevel") ? ".protodevel" : ".proto";
   return StripSuffixString(filename, suffix);
 }
 
@@ -191,15 +193,16 @@ string ModuleAlias(const string& filename) {
   // We'll worry about this problem if/when we actually see it.  This name isn't
   // exposed to users so we can change it later if we need to.
   string basename = StripProto(filename);
-  StripString(&basename, "-", '$');
-  StripString(&basename, "/", '_');
+  ReplaceCharacters(&basename, "-", '$');
+  ReplaceCharacters(&basename, "/", '_');
+  ReplaceCharacters(&basename, ".", '_');
   return basename + "_pb";
 }
 
 // Returns the fully normalized JavaScript path for the given
 // file descriptor's package.
-string GetPath(const GeneratorOptions& options,
-               const FileDescriptor* file) {
+string GetFilePath(const GeneratorOptions& options,
+                   const FileDescriptor* file) {
   if (!options.namespace_prefix.empty()) {
     return options.namespace_prefix;
   } else if (!file->package().empty()) {
@@ -231,49 +234,43 @@ string GetNestedMessageName(const Descriptor* descriptor) {
 string GetPrefix(const GeneratorOptions& options,
                  const FileDescriptor* file_descriptor,
                  const Descriptor* containing_type) {
-  string prefix =
-      GetPath(options, file_descriptor) + GetNestedMessageName(containing_type);
+  string prefix = GetFilePath(options, file_descriptor) +
+                  GetNestedMessageName(containing_type);
   if (!prefix.empty()) {
     prefix += ".";
   }
   return prefix;
 }
 
-
-// Returns the fully normalized JavaScript path for the given
+// Returns the fully normalized JavaScript path prefix for the given
 // message descriptor.
-string GetPath(const GeneratorOptions& options,
-               const Descriptor* descriptor) {
+string GetMessagePathPrefix(const GeneratorOptions& options,
+                            const Descriptor* descriptor) {
   return GetPrefix(
       options, descriptor->file(),
-      descriptor->containing_type()) + descriptor->name();
+      descriptor->containing_type());
 }
 
-
 // Returns the fully normalized JavaScript path for the given
-// field's containing message descriptor.
-string GetPath(const GeneratorOptions& options,
-               const FieldDescriptor* descriptor) {
-  return GetPath(options, descriptor->containing_type());
+// message descriptor.
+string GetMessagePath(const GeneratorOptions& options,
+                      const Descriptor* descriptor) {
+  return GetMessagePathPrefix(options, descriptor) + descriptor->name();
 }
 
-// Returns the fully normalized JavaScript path for the given
+// Returns the fully normalized JavaScript path prefix for the given
 // enumeration descriptor.
-string GetPath(const GeneratorOptions& options,
-               const EnumDescriptor* enum_descriptor) {
-  return GetPrefix(
-      options, enum_descriptor->file(),
-      enum_descriptor->containing_type()) + enum_descriptor->name();
+string GetEnumPathPrefix(const GeneratorOptions& options,
+                   const EnumDescriptor* enum_descriptor) {
+  return GetPrefix(options, enum_descriptor->file(),
+      enum_descriptor->containing_type());
 }
 
-
 // Returns the fully normalized JavaScript path for the given
-// enumeration value descriptor.
-string GetPath(const GeneratorOptions& options,
-               const EnumValueDescriptor* value_descriptor) {
-  return GetPath(
-      options,
-      value_descriptor->type()) + "." + value_descriptor->name();
+// enumeration descriptor.
+string GetEnumPath(const GeneratorOptions& options,
+                   const EnumDescriptor* enum_descriptor) {
+  return GetEnumPathPrefix(options, enum_descriptor) + enum_descriptor->name();
 }
 
 string MaybeCrossFileRef(const GeneratorOptions& options,
@@ -288,7 +285,7 @@ string MaybeCrossFileRef(const GeneratorOptions& options,
            to_message->name();
   } else {
     // Within a single file we use a full name.
-    return GetPath(options, to_message);
+    return GetMessagePath(options, to_message);
   }
 }
 
@@ -413,7 +410,7 @@ string ToFileName(const string& input) {
 // that top-level extensions should go in.
 string GetExtensionFileName(const GeneratorOptions& options,
                             const FileDescriptor* file) {
-  return options.output_dir + "/" + ToFileName(GetPath(options, file)) +
+  return options.output_dir + "/" + ToFileName(GetFilePath(options, file)) +
          options.GetFileNameExtension();
 }
 
@@ -550,14 +547,6 @@ string JSGetterName(const GeneratorOptions& options,
   return name;
 }
 
-string JSMapGetterName(const GeneratorOptions& options,
-                       const FieldDescriptor* field) {
-  return JSIdent(options, field,
-                 /* is_upper_camel = */ true,
-                 /* is_map = */ true,
-                 /* drop_list = */ false);
-}
-
 
 
 string JSOneofName(const OneofDescriptor* oneof) {
@@ -783,8 +772,22 @@ string DoubleToString(double value) {
   return PostProcessFloat(result);
 }
 
+// Return true if this is an integral field that should be represented as string
+// in JS.
+bool IsIntegralFieldWithStringJSType(const FieldDescriptor* field) {
+  switch (field->cpp_type()) {
+    case FieldDescriptor::CPPTYPE_INT64:
+    case FieldDescriptor::CPPTYPE_UINT64:
+      // The default value of JSType is JS_NORMAL, which behaves the same as
+      // JS_NUMBER.
+      return field->options().jstype() == google::protobuf::FieldOptions::JS_STRING;
+    default:
+      return false;
+  }
+}
+
 string MaybeNumberString(const FieldDescriptor* field, const string& orig) {
-  return orig;
+  return IsIntegralFieldWithStringJSType(field) ? ("\"" + orig + "\"") : orig;
 }
 
 string JSFieldDefault(const FieldDescriptor* field) {
@@ -872,18 +875,18 @@ string ProtoTypeName(const GeneratorOptions& options,
     case FieldDescriptor::TYPE_BYTES:
       return "bytes";
     case FieldDescriptor::TYPE_GROUP:
-      return GetPath(options, field->message_type());
+      return GetMessagePath(options, field->message_type());
     case FieldDescriptor::TYPE_ENUM:
-      return GetPath(options, field->enum_type());
+      return GetEnumPath(options, field->enum_type());
     case FieldDescriptor::TYPE_MESSAGE:
-      return GetPath(options, field->message_type());
+      return GetMessagePath(options, field->message_type());
     default:
       return "";
   }
 }
 
 string JSIntegerTypeName(const FieldDescriptor* field) {
-  return "number";
+  return IsIntegralFieldWithStringJSType(field) ? "string" : "number";
 }
 
 string JSStringTypeName(const GeneratorOptions& options,
@@ -925,9 +928,9 @@ string JSTypeName(const GeneratorOptions& options,
     case FieldDescriptor::CPPTYPE_STRING:
       return JSStringTypeName(options, field, bytes_mode);
     case FieldDescriptor::CPPTYPE_ENUM:
-      return GetPath(options, field->enum_type());
+      return GetEnumPath(options, field->enum_type());
     case FieldDescriptor::CPPTYPE_MESSAGE:
-      return GetPath(options, field->message_type());
+      return GetMessagePath(options, field->message_type());
     default:
       return "";
   }
@@ -1023,7 +1026,7 @@ string JSFieldTypeAnnotation(const GeneratorOptions& options,
       if (!IsPrimitive(jstype)) {
         jstype = "!" + jstype;
       }
-      jstype = "Array.<" + jstype + ">";
+      jstype = "Array<" + jstype + ">";
     }
   }
 
@@ -1060,8 +1063,7 @@ string JSBinaryReaderMethodType(const FieldDescriptor* field) {
   if (name[0] >= 'a' && name[0] <= 'z') {
     name[0] = (name[0] - 'a') + 'A';
   }
-
-  return name;
+  return IsIntegralFieldWithStringJSType(field) ? (name + "String") : name;
 }
 
 string JSBinaryReadWriteMethodName(const FieldDescriptor* field,
@@ -1091,6 +1093,40 @@ string JSReturnClause(const FieldDescriptor* desc) {
   return "";
 }
 
+string JSTypeTag(const FieldDescriptor* desc) {
+  switch (desc->type()) {
+    case FieldDescriptor::TYPE_DOUBLE:
+    case FieldDescriptor::TYPE_FLOAT:
+      return "Float";
+    case FieldDescriptor::TYPE_INT32:
+    case FieldDescriptor::TYPE_UINT32:
+    case FieldDescriptor::TYPE_INT64:
+    case FieldDescriptor::TYPE_UINT64:
+    case FieldDescriptor::TYPE_FIXED32:
+    case FieldDescriptor::TYPE_FIXED64:
+    case FieldDescriptor::TYPE_SINT32:
+    case FieldDescriptor::TYPE_SINT64:
+    case FieldDescriptor::TYPE_SFIXED32:
+    case FieldDescriptor::TYPE_SFIXED64:
+      if (IsIntegralFieldWithStringJSType(desc)) {
+        return "StringInt";
+      } else {
+        return "Int";
+      }
+    case FieldDescriptor::TYPE_BOOL:
+      return "Boolean";
+    case FieldDescriptor::TYPE_STRING:
+      return "String";
+    case FieldDescriptor::TYPE_BYTES:
+      return "Bytes";
+    case FieldDescriptor::TYPE_ENUM:
+      return "Enum";
+    default:
+      assert(false);
+  }
+  return "";
+}
+
 string JSReturnDoc(const GeneratorOptions& options,
                    const FieldDescriptor* desc) {
   return "";
@@ -1111,7 +1147,7 @@ static const char* kRepeatedFieldArrayName = ".repeatedFields_";
 string RepeatedFieldsArrayName(const GeneratorOptions& options,
                                const Descriptor* desc) {
   return HasRepeatedFields(options, desc)
-             ? (GetPath(options, desc) + kRepeatedFieldArrayName)
+             ? (GetMessagePath(options, desc) + kRepeatedFieldArrayName)
              : "null";
 }
 
@@ -1128,8 +1164,9 @@ static const char* kOneofGroupArrayName = ".oneofGroups_";
 
 string OneofFieldsArrayName(const GeneratorOptions& options,
                             const Descriptor* desc) {
-  return HasOneofFields(desc) ?
-      (GetPath(options, desc) + kOneofGroupArrayName) : "null";
+  return HasOneofFields(desc)
+             ? (GetMessagePath(options, desc) + kOneofGroupArrayName)
+             : "null";
 }
 
 string RepeatedFieldNumberList(const GeneratorOptions& options,
@@ -1270,13 +1307,6 @@ string FieldComments(const FieldDescriptor* field, BytesMode bytes_mode) {
         " * You should avoid comparisons like {@code val === true/false} in "
         "those cases.\n";
   }
-  if (field->is_repeated()) {
-    comments +=
-        " * If you change this array by adding, removing or replacing "
-        "elements, or if you\n"
-        " * replace the array itself, then you must call the setter to "
-        "update it.\n";
-  }
   if (field->type() == FieldDescriptor::TYPE_BYTES && bytes_mode == BYTES_U8) {
     comments +=
         " * Note that Uint8Array is not supported on all browsers.\n"
@@ -1349,7 +1379,7 @@ bool IsExtendable(const Descriptor* desc) {
 // Returns the max index in the underlying data storage array beyond which the
 // extension object is used.
 string GetPivot(const Descriptor* desc) {
-  static const int kDefaultPivot = (1 << 29);  // max field number (29 bits)
+  static const int kDefaultPivot = 500;
 
   // Find the max field number
   int max_field_number = 0;
@@ -1361,7 +1391,7 @@ string GetPivot(const Descriptor* desc) {
   }
 
   int pivot = -1;
-  if (IsExtendable(desc)) {
+  if (IsExtendable(desc) || (max_field_number >= kDefaultPivot)) {
     pivot = ((max_field_number + 1) < kDefaultPivot) ?
         (max_field_number + 1) : kDefaultPivot;
   }
@@ -1526,6 +1556,22 @@ bool GenerateJspbAllowedSet(const GeneratorOptions& options,
   return true;
 }
 
+// Embeds base64 encoded GeneratedCodeInfo proto in a comment at the end of
+// file.
+void EmbedCodeAnnotations(const GeneratedCodeInfo& annotations,
+                          io::Printer* printer) {
+  // Serialize annotations proto into base64 string.
+  string meta_content;
+  annotations.SerializeToString(&meta_content);
+  string meta_64;
+  Base64Escape(meta_content, &meta_64);
+
+  // Print base64 encoded annotations at the end of output file in
+  // a comment.
+  printer->Print("\n// Below is base64 encoded GeneratedCodeInfo proto");
+  printer->Print("\n// $encoded_proto$\n", "encoded_proto", meta_64);
+}
+
 }  // anonymous namespace
 
 void Generator::GenerateHeader(const GeneratorOptions& options,
@@ -1533,6 +1579,10 @@ void Generator::GenerateHeader(const GeneratorOptions& options,
   printer->Print("/**\n"
                  " * @fileoverview\n"
                  " * @enhanceable\n"
+                 " * @suppress {messageConventions} JS Compiler reports an "
+                 "error if a variable or\n"
+                 " *     field starts with 'MSG_' and isn't a translatable "
+                 "message.\n"
                  " * @public\n"
                  " */\n"
                  "// GENERATED CODE -- DO NOT EDIT!\n"
@@ -1571,7 +1621,7 @@ void Generator::FindProvidesForMessage(
     return;
   }
 
-  string name = GetPath(options, desc);
+  string name = GetMessagePath(options, desc);
   provided->insert(name);
 
   for (int i = 0; i < desc->enum_type_count(); i++) {
@@ -1588,7 +1638,7 @@ void Generator::FindProvidesForEnum(const GeneratorOptions& options,
                                     io::Printer* printer,
                                     const EnumDescriptor* enumdesc,
                                     std::set<string>* provided) const {
-  string name = GetPath(options, enumdesc);
+  string name = GetEnumPath(options, enumdesc);
   provided->insert(name);
 }
 
@@ -1604,9 +1654,8 @@ void Generator::FindProvidesForFields(
       continue;
     }
 
-    string name =
-        GetPath(options, field->file()) + "." +
-        JSObjectFieldName(options, field);
+    string name = GetFilePath(options, field->file()) + "." +
+                  JSObjectFieldName(options, field);
     provided->insert(name);
   }
 }
@@ -1684,7 +1733,7 @@ void Generator::GenerateRequiresForLibrary(
       }
       if (extension->containing_type()->full_name() !=
         "google.protobuf.bridge.MessageSet") {
-        required.insert(GetPath(options, extension->containing_type()));
+        required.insert(GetMessagePath(options, extension->containing_type()));
       }
       FindRequiresForField(options, extension, &required, &forwards);
       have_extensions = true;
@@ -1725,18 +1774,16 @@ void Generator::GenerateRequiresImpl(const GeneratorOptions& options,
                                      bool require_jspb, bool require_extension,
                                      bool require_map) const {
   if (require_jspb) {
-    printer->Print(
-        "goog.require('jspb.Message');\n"
-        "goog.require('jspb.BinaryReader');\n"
-        "goog.require('jspb.BinaryWriter');\n");
+    required->insert("jspb.Message");
+    required->insert("jspb.BinaryReader");
+    required->insert("jspb.BinaryWriter");
   }
   if (require_extension) {
-    printer->Print("goog.require('jspb.ExtensionFieldBinaryInfo');\n");
-    printer->Print(
-        "goog.require('jspb.ExtensionFieldInfo');\n");
+    required->insert("jspb.ExtensionFieldBinaryInfo");
+    required->insert("jspb.ExtensionFieldInfo");
   }
   if (require_map) {
-    printer->Print("goog.require('jspb.Map');\n");
+    required->insert("jspb.Map");
   }
 
   std::set<string>::iterator it;
@@ -1805,13 +1852,13 @@ void Generator::FindRequiresForField(const GeneratorOptions& options,
         // dependencies, as per original codegen.
         !(field->is_extension() && field->extension_scope() == NULL)) {
       if (options.add_require_for_enums) {
-        required->insert(GetPath(options, field->enum_type()));
+        required->insert(GetEnumPath(options, field->enum_type()));
       } else {
-        forwards->insert(GetPath(options, field->enum_type()));
+        forwards->insert(GetEnumPath(options, field->enum_type()));
       }
     } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
       if (!IgnoreMessage(options, field->message_type())) {
-        required->insert(GetPath(options, field->message_type()));
+        required->insert(GetMessagePath(options, field->message_type()));
       }
     }
 }
@@ -1821,7 +1868,7 @@ void Generator::FindRequiresForExtension(const GeneratorOptions& options,
                                          std::set<string>* required,
                                          std::set<string>* forwards) const {
     if (field->containing_type()->full_name() != "google.protobuf.bridge.MessageSet") {
-      required->insert(GetPath(options, field->containing_type()));
+      required->insert(GetMessagePath(options, field->containing_type()));
     }
     FindRequiresForField(options, field, required, forwards);
 }
@@ -1868,7 +1915,7 @@ void Generator::GenerateClass(const GeneratorOptions& options,
   }
 
   // Recurse on nested types. These must come *before* the extension-field
-  // info generation in GenerateClassRegistration so that extensions that 
+  // info generation in GenerateClassRegistration so that extensions that
   // reference nested types proceed the definitions of the nested types.
   for (int i = 0; i < desc->enum_type_count(); i++) {
     GenerateEnum(options, printer, desc->enum_type(i));
@@ -1890,7 +1937,6 @@ void Generator::GenerateClass(const GeneratorOptions& options,
       }
     }
   }
-
 }
 
 void Generator::GenerateClassConstructor(const GeneratorOptions& options,
@@ -1911,8 +1957,10 @@ void Generator::GenerateClassConstructor(const GeneratorOptions& options,
       " * @extends {jspb.Message}\n"
       " * @constructor\n"
       " */\n"
-      "$classname$ = function(opt_data) {\n",
-      "classname", GetPath(options, desc));
+      "$classprefix$$classname$ = function(opt_data) {\n",
+      "classprefix", GetMessagePathPrefix(options, desc),
+      "classname", desc->name());
+  printer->Annotate("classname", desc);
   string message_id = GetMessageId(desc);
   printer->Print(
       "  jspb.Message.initialize(this, opt_data, $messageId$, $pivot$, "
@@ -1929,7 +1977,7 @@ void Generator::GenerateClassConstructor(const GeneratorOptions& options,
       "if (goog.DEBUG && !COMPILED) {\n"
       "  $classname$.displayName = '$classname$';\n"
       "}\n",
-      "classname", GetPath(options, desc));
+      "classname", GetMessagePath(options, desc));
 }
 
 void Generator::GenerateClassFieldInfo(const GeneratorOptions& options,
@@ -1944,7 +1992,7 @@ void Generator::GenerateClassFieldInfo(const GeneratorOptions& options,
         " */\n"
         "$classname$$rptfieldarray$ = $rptfields$;\n"
         "\n",
-        "classname", GetPath(options, desc),
+        "classname", GetMessagePath(options, desc),
         "rptfieldarray", kRepeatedFieldArrayName,
         "rptfields", RepeatedFieldNumberList(options, desc));
   }
@@ -1965,7 +2013,7 @@ void Generator::GenerateClassFieldInfo(const GeneratorOptions& options,
         " */\n"
         "$classname$$oneofgrouparray$ = $oneofgroups$;\n"
         "\n",
-        "classname", GetPath(options, desc),
+        "classname", GetMessagePath(options, desc),
         "oneofgrouparray", kOneofGroupArrayName,
         "oneofgroups", OneofGroupList(desc));
 
@@ -1985,7 +2033,7 @@ void Generator::GenerateClassXid(const GeneratorOptions& options,
       "\n"
       "\n"
       "$class$.prototype.messageXid = xid('$class$');\n",
-      "class", GetPath(options, desc));
+      "class", GetMessagePath(options, desc));
 }
 
 void Generator::GenerateOneofCaseDefinition(
@@ -1998,7 +2046,7 @@ void Generator::GenerateOneofCaseDefinition(
       " */\n"
       "$classname$.$oneof$Case = {\n"
       "  $upcase$_NOT_SET: 0",
-      "classname", GetPath(options, oneof->containing_type()),
+      "classname", GetMessagePath(options, oneof->containing_type()),
       "oneof", JSOneofName(oneof),
       "upcase", ToEnumCase(oneof->name()));
 
@@ -2012,6 +2060,7 @@ void Generator::GenerateOneofCaseDefinition(
         "  $upcase$: $number$",
         "upcase", ToEnumCase(oneof->field(i)->name()),
         "number", JSFieldIndex(oneof->field(i)));
+    printer->Annotate("upcase", oneof->field(i));
   }
 
   printer->Print(
@@ -2026,7 +2075,7 @@ void Generator::GenerateOneofCaseDefinition(
       "computeOneofCase(this, $class$.oneofGroups_[$oneofindex$]));\n"
       "};\n"
       "\n",
-      "class", GetPath(options, oneof->containing_type()),
+      "class", GetMessagePath(options, oneof->containing_type()),
       "oneof", JSOneofName(oneof),
       "oneofindex", JSOneofIndex(oneof));
 }
@@ -2065,10 +2114,11 @@ void Generator::GenerateClassToObject(const GeneratorOptions& options,
       " *     http://goto/soy-param-migration\n"
       " * @param {!$classname$} msg The msg instance to transform.\n"
       " * @return {!Object}\n"
+      " * @suppress {unusedLocalVariables} f is only used for nested messages\n"
       " */\n"
       "$classname$.toObject = function(includeInstance, msg) {\n"
       "  var f, obj = {",
-      "classname", GetPath(options, desc));
+      "classname", GetMessagePath(options, desc));
 
   bool first = true;
   for (int i = 0; i < desc->field_count(); i++) {
@@ -2100,7 +2150,7 @@ void Generator::GenerateClassToObject(const GeneratorOptions& options,
         "      $extObject$, $class$.prototype.getExtension,\n"
         "      includeInstance);\n",
         "extObject", JSExtensionsObjectName(options, desc->file(), desc),
-        "class", GetPath(options, desc));
+        "class", GetMessagePath(options, desc));
   }
 
   printer->Print(
@@ -2112,7 +2162,7 @@ void Generator::GenerateClassToObject(const GeneratorOptions& options,
       "}\n"
       "\n"
       "\n",
-      "classname", GetPath(options, desc));
+      "classname", GetMessagePath(options, desc));
 }
 
 void Generator::GenerateFieldValueExpression(io::Printer* printer,
@@ -2153,7 +2203,8 @@ void Generator::GenerateFieldValueExpression(io::Printer* printer,
             "obj", obj_reference);
       }
     } else {
-      printer->Print("jspb.Message.getField($obj$, $index$)",
+      printer->Print("jspb.Message.get$cardinality$Field($obj$, $index$)",
+                     "cardinality", field->is_repeated() ? "Repeated" : "",
                      "index", JSFieldIndex(field),
                      "obj", obj_reference);
     }
@@ -2173,7 +2224,7 @@ void Generator::GenerateClassFieldToObject(const GeneratorOptions& options,
     string value_to_object;
     if (value_field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
       value_to_object =
-          GetPath(options, value_field->message_type()) + ".toObject";
+          GetMessagePath(options, value_field->message_type()) + ".toObject";
     } else {
       value_to_object = "undefined";
     }
@@ -2235,7 +2286,7 @@ void Generator::GenerateClassFromObject(const GeneratorOptions& options,
       " */\n"
       "$classname$.fromObject = function(obj) {\n"
       "  var f, msg = new $classname$();\n",
-      "classname", GetPath(options, desc));
+      "classname", GetMessagePath(options, desc));
 
   for (int i = 0; i < desc->field_count(); i++) {
     const FieldDescriptor* field = desc->field(i);
@@ -2263,7 +2314,7 @@ void Generator::GenerateClassFieldFromObject(
           "$fieldclass$.fromObject));\n",
           "name", JSObjectFieldName(options, field),
           "index", JSFieldIndex(field),
-          "fieldclass", GetPath(options, value_field->message_type()));
+          "fieldclass", GetMessagePath(options, value_field->message_type()));
     } else {
       // `msg` is a newly-constructed message object that has not yet built any
       // map containers wrapping underlying arrays, so we can simply directly
@@ -2354,14 +2405,13 @@ void GenerateBytesWrapper(const GeneratorOptions& options,
       "fielddef", FieldDefinition(options, field),
       "comment", FieldComments(field, bytes_mode),
       "type", type,
-      "class", GetPath(options, field->containing_type()),
+      "class", GetMessagePath(options, field->containing_type()),
       "name", JSGetterName(options, field, bytes_mode),
       "list", field->is_repeated() ? "List" : "",
       "suffix", JSByteGetterSuffix(bytes_mode),
       "defname", JSGetterName(options, field, BYTES_DEFAULT));
 }
 
-
 void Generator::GenerateClassField(const GeneratorOptions& options,
                                    io::Printer* printer,
                                    const FieldDescriptor* field) const {
@@ -2393,20 +2443,22 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
         "keytype", key_type,
         "valuetype", value_type);
     printer->Print(
-        "$class$.prototype.get$name$ = function(opt_noLazyCreate) {\n"
+        "$class$.prototype.$gettername$ = function(opt_noLazyCreate) {\n"
         "  return /** @type {!jspb.Map<$keytype$,$valuetype$>} */ (\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "gettername", "get" + JSGetterName(options, field),
         "keytype", key_type,
         "valuetype", value_type);
+    printer->Annotate("gettername", field);
     printer->Print(
         "      jspb.Message.getMapField(this, $index$, opt_noLazyCreate",
         "index", JSFieldIndex(field));
 
     if (value_field->type() == FieldDescriptor::TYPE_MESSAGE) {
-      printer->Print(",\n"
+      printer->Print(
+          ",\n"
           "      $messageType$",
-            "messageType", GetPath(options, value_field->message_type()));
+          "messageType", GetMessagePath(options, value_field->message_type()));
     } else {
       printer->Print(",\n"
           "      null");
@@ -2436,15 +2488,15 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
                                       /* force_present = */ false,
                                       /* singular_if_not_packed = */ false));
     printer->Print(
-        "$class$.prototype.get$name$ = function() {\n"
+        "$class$.prototype.$gettername$ = function() {\n"
         "  return /** @type{$type$} */ (\n"
         "    jspb.Message.get$rpt$WrapperField(this, $wrapperclass$, "
         "$index$$required$));\n"
         "};\n"
         "\n"
         "\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "gettername", "get" + JSGetterName(options, field),
         "type", JSFieldTypeAnnotation(options, field,
                                       /* is_setter_argument = */ false,
                                       /* force_present = */ false,
@@ -2454,9 +2506,10 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
         "wrapperclass", SubmessageTypeRef(options, field),
         "required", (field->label() == FieldDescriptor::LABEL_REQUIRED ?
                      ", 1" : ""));
+    printer->Annotate("gettername", field);
     printer->Print(
         "/** @param {$optionaltype$} value$returndoc$ */\n"
-        "$class$.prototype.set$name$ = function(value) {\n"
+        "$class$.prototype.$settername$ = function(value) {\n"
         "  jspb.Message.set$oneoftag$$repeatedtag$WrapperField(",
         "optionaltype",
         JSFieldTypeAnnotation(options, field,
@@ -2464,10 +2517,11 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
                               /* force_present = */ false,
                               /* singular_if_not_packed = */ false),
         "returndoc", JSReturnDoc(options, field),
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "settername", "set" + JSGetterName(options, field),
         "oneoftag", (field->containing_oneof() ? "Oneof" : ""),
         "repeatedtag", (field->is_repeated() ? "Repeated" : ""));
+    printer->Annotate("settername", field);
 
     printer->Print(
         "this, $index$$oneofgroup$, value);$returnvalue$\n"
@@ -2490,7 +2544,7 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
     // Simple (primitive) field, either singular or repeated.
 
     // TODO(b/26173701): Always use BYTES_DEFAULT for the getter return type;
-    // at this point we "lie" to non-binary users and tell the the return
+    // at this point we "lie" to non-binary users and tell the return
     // type is always base64 string, pending a LSC to migrate to typed getters.
     BytesMode bytes_mode =
         field->type() == FieldDescriptor::TYPE_BYTES && !options.binary ?
@@ -2519,9 +2573,10 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
     }
 
     printer->Print(
-        "$class$.prototype.get$name$ = function() {\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field));
+        "$class$.prototype.$gettername$ = function() {\n",
+        "class", GetMessagePath(options, field->containing_type()),
+        "gettername", "get" + JSGetterName(options, field));
+    printer->Annotate("gettername", field);
 
     if (untyped) {
       printer->Print(
@@ -2582,26 +2637,47 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
               /* singular_if_not_packed = */ false),
           "returndoc", JSReturnDoc(options, field));
     }
-    printer->Print(
-        "$class$.prototype.set$name$ = function(value) {\n"
-        "  jspb.Message.set$oneoftag$Field(this, $index$",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
-        "oneoftag", (field->containing_oneof() ? "Oneof" : ""),
-        "index", JSFieldIndex(field));
-    printer->Print(
-        "$oneofgroup$, $type$value$rptvalueinit$$typeclose$);$returnvalue$\n"
-        "};\n"
-        "\n"
-        "\n",
-        "type",
-        untyped ? "/** @type{string|number|boolean|Array|undefined} */(" : "",
-        "typeclose", untyped ? ")" : "",
-        "oneofgroup",
-        (field->containing_oneof() ? (", " + JSOneofArray(options, field))
-                                   : ""),
-        "returnvalue", JSReturnClause(field), "rptvalueinit",
-        (field->is_repeated() ? " || []" : ""));
+
+    if (field->file()->syntax() == FileDescriptor::SYNTAX_PROTO3 &&
+        !field->is_repeated() && !field->is_map() &&
+        !HasFieldPresence(options, field)) {
+      // Proto3 non-repeated and non-map fields without presence use the
+      // setProto3*Field function.
+      printer->Print(
+          "$class$.prototype.$settername$ = function(value) {\n"
+          "  jspb.Message.setProto3$typetag$Field(this, $index$, "
+          "value);$returnvalue$\n"
+          "};\n"
+          "\n"
+          "\n",
+          "class", GetMessagePath(options, field->containing_type()),
+          "settername", "set" + JSGetterName(options, field), "typetag",
+          JSTypeTag(field), "index", JSFieldIndex(field), "returnvalue",
+          JSReturnClause(field));
+      printer->Annotate("settername", field);
+    } else {
+      // Otherwise, use the regular setField function.
+      printer->Print(
+          "$class$.prototype.$settername$ = function(value) {\n"
+          "  jspb.Message.set$oneoftag$Field(this, $index$",
+          "class", GetMessagePath(options, field->containing_type()),
+          "settername", "set" + JSGetterName(options, field), "oneoftag",
+          (field->containing_oneof() ? "Oneof" : ""), "index",
+          JSFieldIndex(field));
+      printer->Annotate("settername", field);
+      printer->Print(
+          "$oneofgroup$, $type$value$rptvalueinit$$typeclose$);$returnvalue$\n"
+          "};\n"
+          "\n"
+          "\n",
+          "type",
+          untyped ? "/** @type{string|number|boolean|Array|undefined} */(" : "",
+          "typeclose", untyped ? ")" : "", "oneofgroup",
+          (field->containing_oneof() ? (", " + JSOneofArray(options, field))
+                                     : ""),
+          "returnvalue", JSReturnClause(field), "rptvalueinit",
+          (field->is_repeated() ? " || []" : ""));
+    }
 
     if (untyped) {
       printer->Print(
@@ -2621,41 +2697,46 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
   // fields with presence.
   if (IsMap(options, field)) {
     printer->Print(
-        "$class$.prototype.clear$name$ = function() {\n"
-        "  this.get$name$().clear();$returnvalue$\n"
+        "$class$.prototype.$clearername$ = function() {\n"
+        "  this.$gettername$().clear();$returnvalue$\n"
         "};\n"
         "\n"
         "\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "clearername", "clear" + JSGetterName(options, field),
+        "gettername", "get" + JSGetterName(options, field),
         "returnvalue", JSReturnClause(field));
+    printer->Annotate("clearername", field);
   } else if (field->is_repeated() ||
              (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
               !field->is_required())) {
     // Fields where we can delegate to the regular setter.
     printer->Print(
-        "$class$.prototype.clear$name$ = function() {\n"
-        "  this.set$name$($clearedvalue$);$returnvalue$\n"
+        "$class$.prototype.$clearername$ = function() {\n"
+        "  this.$settername$($clearedvalue$);$returnvalue$\n"
         "};\n"
         "\n"
         "\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "clearername", "clear" + JSGetterName(options, field),
+        "settername", "set" + JSGetterName(options, field),
         "clearedvalue", (field->is_repeated() ? "[]" : "undefined"),
         "returnvalue", JSReturnClause(field));
+    printer->Annotate("clearername", field);
   } else if (HasFieldPresence(options, field)) {
     // Fields where we can't delegate to the regular setter because it doesn't
     // accept "undefined" as an argument.
     printer->Print(
-        "$class$.prototype.clear$name$ = function() {\n"
+        "$class$.prototype.$clearername$ = function() {\n"
         "  jspb.Message.set$maybeoneof$Field(this, "
         "$index$$maybeoneofgroup$, ",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "clearername", "clear" + JSGetterName(options, field),
         "maybeoneof", (field->containing_oneof() ? "Oneof" : ""),
         "maybeoneofgroup", (field->containing_oneof() ?
                            (", " + JSOneofArray(options, field)) : ""),
         "index", JSFieldIndex(field));
+    printer->Annotate("clearername", field);
     printer->Print(
         "$clearedvalue$);$returnvalue$\n"
         "};\n"
@@ -2671,41 +2752,48 @@ void Generator::GenerateClassField(const GeneratorOptions& options,
         " * Returns whether this field is set.\n"
         " * @return {!boolean}\n"
         " */\n"
-        "$class$.prototype.has$name$ = function() {\n"
+        "$class$.prototype.$hasername$ = function() {\n"
         "  return jspb.Message.getField(this, $index$) != null;\n"
         "};\n"
         "\n"
         "\n",
-        "class", GetPath(options, field->containing_type()),
-        "name", JSGetterName(options, field),
+        "class", GetMessagePath(options, field->containing_type()),
+        "hasername", "has" + JSGetterName(options, field),
         "index", JSFieldIndex(field));
+    printer->Annotate("hasername", field);
   }
 }
 
 void Generator::GenerateRepeatedPrimitiveHelperMethods(
     const GeneratorOptions& options, io::Printer* printer,
     const FieldDescriptor* field, bool untyped) const {
+  // clang-format off
   printer->Print(
       "/**\n"
       " * @param {!$optionaltype$} value\n"
-      " * @param {number=} opt_index\n"
+      " * @param {number=} opt_index$returndoc$\n"
       " */\n"
-      "$class$.prototype.add$name$ = function(value, opt_index) {\n"
+      "$class$.prototype.$addername$ = function(value, opt_index) {\n"
       "  jspb.Message.addToRepeatedField(this, $index$",
-      "class", GetPath(options, field->containing_type()), "name",
-      JSGetterName(options, field, BYTES_DEFAULT,
-                   /* drop_list = */ true),
-      "optionaltype", JSTypeName(options, field, BYTES_DEFAULT), "index",
-      JSFieldIndex(field));
+      "class", GetMessagePath(options, field->containing_type()), "addername",
+      "add" + JSGetterName(options, field, BYTES_DEFAULT,
+                           /* drop_list = */ true),
+      "optionaltype", JSTypeName(options, field, BYTES_DEFAULT),
+      "index", JSFieldIndex(field),
+      "returndoc", JSReturnDoc(options, field));
+  printer->Annotate("addername", field);
   printer->Print(
-      "$oneofgroup$, $type$value$rptvalueinit$$typeclose$, opt_index);\n"
+      "$oneofgroup$, $type$value$rptvalueinit$$typeclose$, "
+      "opt_index);$returnvalue$\n"
       "};\n"
       "\n"
       "\n",
       "type", untyped ? "/** @type{string|number|boolean|!Uint8Array} */(" : "",
       "typeclose", untyped ? ")" : "", "oneofgroup",
       (field->containing_oneof() ? (", " + JSOneofArray(options, field)) : ""),
-      "rptvalueinit", "");
+      "rptvalueinit", "",
+      "returnvalue", JSReturnClause(field));
+  // clang-format on
 }
 
 void Generator::GenerateRepeatedMessageHelperMethods(
@@ -2719,9 +2807,9 @@ void Generator::GenerateRepeatedMessageHelperMethods(
       " */\n"
       "$class$.prototype.add$name$ = function(opt_value, opt_index) {\n"
       "  return jspb.Message.addTo$repeatedtag$WrapperField(",
-      "optionaltype", JSTypeName(options, field, BYTES_DEFAULT), "class",
-      GetPath(options, field->containing_type()), "name",
-      JSGetterName(options, field, BYTES_DEFAULT,
+      "optionaltype", JSTypeName(options, field, BYTES_DEFAULT),
+      "class", GetMessagePath(options, field->containing_type()),
+      "name", JSGetterName(options, field, BYTES_DEFAULT,
                    /* drop_list = */ true),
       "repeatedtag", (field->is_repeated() ? "Repeated" : ""));
 
@@ -2732,7 +2820,7 @@ void Generator::GenerateRepeatedMessageHelperMethods(
       "\n",
       "index", JSFieldIndex(field), "oneofgroup",
       (field->containing_oneof() ? (", " + JSOneofArray(options, field)) : ""),
-      "ctor", GetPath(options, field->message_type()));
+      "ctor", GetMessagePath(options, field->message_type()));
 }
 
 void Generator::GenerateClassExtensionFieldInfo(const GeneratorOptions& options,
@@ -2754,11 +2842,11 @@ void Generator::GenerateClassExtensionFieldInfo(const GeneratorOptions& options,
         "so that it\n"
         " * works in OPTIMIZED mode.\n"
         " *\n"
-        " * @type {!Object.<number, jspb.ExtensionFieldInfo>}\n"
+        " * @type {!Object<number, jspb.ExtensionFieldInfo>}\n"
         " */\n"
         "$class$.extensions = {};\n"
         "\n",
-        "class", GetPath(options, desc));
+        "class", GetMessagePath(options, desc));
 
     printer->Print(
         "\n"
@@ -2775,11 +2863,11 @@ void Generator::GenerateClassExtensionFieldInfo(const GeneratorOptions& options,
         "so that it\n"
         " * works in OPTIMIZED mode.\n"
         " *\n"
-        " * @type {!Object.<number, jspb.ExtensionFieldBinaryInfo>}\n"
+        " * @type {!Object<number, jspb.ExtensionFieldBinaryInfo>}\n"
         " */\n"
         "$class$.extensionsBinary = {};\n"
         "\n",
-        "class", GetPath(options, desc));
+        "class", GetMessagePath(options, desc));
   }
 }
 
@@ -2817,7 +2905,7 @@ void Generator::GenerateClassDeserializeBinary(const GeneratorOptions& options,
       "    }\n"
       "    var field = reader.getFieldNumber();\n"
       "    switch (field) {\n",
-      "class", GetPath(options, desc));
+      "class", GetMessagePath(options, desc));
 
   for (int i = 0; i < desc->field_count(); i++) {
     if (!IgnoreField(desc->field(i))) {
@@ -2834,7 +2922,7 @@ void Generator::GenerateClassDeserializeBinary(const GeneratorOptions& options,
         "        $class$.prototype.setExtension);\n"
         "      break;\n",
         "extobj", JSExtensionsObjectName(options, desc->file(), desc),
-        "class", GetPath(options, desc));
+        "class", GetMessagePath(options, desc));
   } else {
     printer->Print(
         "      reader.skipField();\n"
@@ -2873,7 +2961,7 @@ void Generator::GenerateClassDeserializeBinaryField(
 
     if (value_field->type() == FieldDescriptor::TYPE_MESSAGE) {
       printer->Print(", $messageType$.deserializeBinaryFromReader",
-          "messageType", GetPath(options, value_field->message_type()));
+          "messageType", GetMessagePath(options, value_field->message_type()));
     }
 
     printer->Print(");\n");
@@ -2937,11 +3025,12 @@ void Generator::GenerateClassSerializeBinary(const GeneratorOptions& options,
       " * format), writing to the given BinaryWriter.\n"
       " * @param {!$class$} message\n"
       " * @param {!jspb.BinaryWriter} writer\n"
+      " * @suppress {unusedLocalVariables} f is only used for nested messages\n"
       " */\n"
       "$class$.serializeBinaryToWriter = function(message, "
       "writer) {\n"
       "  var f = undefined;\n",
-      "class", GetPath(options, desc));
+      "class", GetMessagePath(options, desc));
 
   for (int i = 0; i < desc->field_count(); i++) {
     if (!IgnoreField(desc->field(i))) {
@@ -2954,7 +3043,7 @@ void Generator::GenerateClassSerializeBinary(const GeneratorOptions& options,
         "  jspb.Message.serializeBinaryExtensions(message, writer,\n"
         "    $extobj$Binary, $class$.prototype.getExtension);\n",
         "extobj", JSExtensionsObjectName(options, desc->file(), desc),
-        "class", GetPath(options, desc));
+        "class", GetMessagePath(options, desc));
   }
 
   printer->Print(
@@ -3009,7 +3098,13 @@ void Generator::GenerateClassSerializeBinaryField(
         case FieldDescriptor::CPPTYPE_INT64:
         case FieldDescriptor::CPPTYPE_UINT32:
         case FieldDescriptor::CPPTYPE_UINT64: {
-          {
+          if (IsIntegralFieldWithStringJSType(field)) {
+            // We can use `parseInt` here even though it will not be precise for
+            // 64-bit quantities because we are only testing for zero/nonzero,
+            // and JS numbers (64-bit floating point values, i.e., doubles) are
+            // integer-precise in the range that includes zero.
+            printer->Print("  if (parseInt(f, 10) !== 0) {\n");
+          } else {
             printer->Print("  if (f !== 0) {\n");
           }
           break;
@@ -3049,7 +3144,7 @@ void Generator::GenerateClassSerializeBinaryField(
 
     if (value_field->type() == FieldDescriptor::TYPE_MESSAGE) {
       printer->Print(", $messageType$.serializeBinaryToWriter",
-          "messageType", GetPath(options, value_field->message_type()));
+          "messageType", GetMessagePath(options, value_field->message_type()));
     }
 
     printer->Print(");\n");
@@ -3087,8 +3182,10 @@ void Generator::GenerateEnum(const GeneratorOptions& options,
       "/**\n"
       " * @enum {number}\n"
       " */\n"
-      "$name$ = {\n",
-      "name", GetPath(options, enumdesc));
+      "$enumprefix$$name$ = {\n",
+      "enumprefix", GetEnumPathPrefix(options, enumdesc),
+      "name", enumdesc->name());
+  printer->Annotate("name", enumdesc);
 
   for (int i = 0; i < enumdesc->value_count(); i++) {
     const EnumValueDescriptor* value = enumdesc->value(i);
@@ -3097,6 +3194,7 @@ void Generator::GenerateEnum(const GeneratorOptions& options,
         "name", ToEnumCase(value->name()),
         "value", SimpleItoa(value->number()),
         "comma", (i == enumdesc->value_count() - 1) ? "" : ",");
+    printer->Annotate("name", value);
   }
 
   printer->Print(
@@ -3108,25 +3206,28 @@ void Generator::GenerateExtension(const GeneratorOptions& options,
                                   io::Printer* printer,
                                   const FieldDescriptor* field) const {
   string extension_scope =
-      (field->extension_scope() ?
-       GetPath(options, field->extension_scope()) :
-       GetPath(options, field->file()));
+      (field->extension_scope()
+           ? GetMessagePath(options, field->extension_scope())
+           : GetFilePath(options, field->file()));
 
+  const string extension_object_name = JSObjectFieldName(options, field);
   printer->Print(
       "\n"
       "/**\n"
       " * A tuple of {field number, class constructor} for the extension\n"
-      " * field named `$name$`.\n"
-      " * @type {!jspb.ExtensionFieldInfo.<$extensionType$>}\n"
+      " * field named `$nameInComment$`.\n"
+      " * @type {!jspb.ExtensionFieldInfo<$extensionType$>}\n"
       " */\n"
       "$class$.$name$ = new jspb.ExtensionFieldInfo(\n",
-      "name", JSObjectFieldName(options, field),
+      "nameInComment", extension_object_name,
+      "name", extension_object_name,
       "class", extension_scope,
       "extensionType", JSFieldTypeAnnotation(
           options, field,
           /* is_setter_argument = */ false,
           /* force_present = */ true,
           /* singular_if_not_packed = */ false));
+  printer->Annotate("name", field);
   printer->Print(
       "    $index$,\n"
       "    {$name$: 0},\n"
@@ -3136,7 +3237,7 @@ void Generator::GenerateExtension(const GeneratorOptions& options,
       "         $toObject$),\n"
       "    $repeated$);\n",
       "index", SimpleItoa(field->number()),
-      "name", JSObjectFieldName(options, field),
+      "name", extension_object_name,
       "ctor", (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE ?
                SubmessageTypeRef(options, field) : string("null")),
       "toObject", (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE ?
@@ -3155,7 +3256,7 @@ void Generator::GenerateExtension(const GeneratorOptions& options,
       "extendName",
       JSExtensionsObjectName(options, field->file(), field->containing_type()),
       "index", SimpleItoa(field->number()), "class", extension_scope, "name",
-      JSObjectFieldName(options, field), "binaryReaderFn",
+      extension_object_name, "binaryReaderFn",
       JSBinaryReaderMethodName(options, field), "binaryWriterFn",
       JSBinaryWriterMethodName(options, field), "binaryMessageSerializeFn",
       (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE)
@@ -3178,7 +3279,7 @@ void Generator::GenerateExtension(const GeneratorOptions& options,
                                            field->containing_type()),
       "index", SimpleItoa(field->number()),
       "class", extension_scope,
-      "name", JSObjectFieldName(options, field));
+      "name", extension_object_name);
 }
 
 bool GeneratorOptions::ParseFromOptions(
@@ -3236,6 +3337,12 @@ bool GeneratorOptions::ParseFromOptions(
         return false;
       }
       one_output_file_per_input_file = true;
+    } else if (options[i].first == "annotate_code") {
+      if (!options[i].second.empty()) {
+        *error = "Unexpected option value for annotate_code";
+        return false;
+      }
+      annotate_code = true;
     } else {
       // Assume any other option is an output directory, as long as it is a bare
       // `key` rather than a `key=value` option.
@@ -3333,7 +3440,8 @@ void Generator::GenerateFile(const GeneratorOptions& options,
       printer->Print(
           "var $alias$ = require('$file$');\n",
           "alias", ModuleAlias(name),
-          "file", GetRootPath(file->name(), name) + GetJSFilename(options, name));
+          "file",
+          GetRootPath(file->name(), name) + GetJSFilename(options, name));
     }
   }
 
@@ -3347,7 +3455,7 @@ void Generator::GenerateFile(const GeneratorOptions& options,
         IgnoreField(file->extension(i))) {
       continue;
     }
-    provided.insert(GetPath(options, file) + "." +
+    provided.insert(GetFilePath(options, file) + "." +
                     JSObjectFieldName(options, file->extension(i)));
     extensions.insert(file->extension(i));
   }
@@ -3371,7 +3479,7 @@ void Generator::GenerateFile(const GeneratorOptions& options,
 
   if (options.import_style == GeneratorOptions::kImportCommonJs) {
     printer->Print("goog.object.extend(exports, $package$);\n",
-                   "package", GetPath(options, file));
+                   "package", GetFilePath(options, file));
   }
 
   // Emit well-known type methods.
@@ -3399,7 +3507,7 @@ bool Generator::GenerateAll(const std::vector<const FileDescriptor*>& files,
     // All output should go in a single file.
     string filename = options.output_dir + "/" + options.library +
                       options.GetFileNameExtension();
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
+    std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
     GOOGLE_CHECK(output.get());
     io::Printer printer(output.get(), '$');
 
@@ -3448,7 +3556,7 @@ bool Generator::GenerateAll(const std::vector<const FileDescriptor*>& files,
         }
 
         string filename = GetMessageFileName(options, desc);
-        google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+        std::unique_ptr<io::ZeroCopyOutputStream> output(
             context->Open(filename));
         GOOGLE_CHECK(output.get());
         io::Printer printer(output.get(), '$');
@@ -3474,7 +3582,7 @@ bool Generator::GenerateAll(const std::vector<const FileDescriptor*>& files,
         }
 
         string filename = GetEnumFileName(options, enumdesc);
-        google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+        std::unique_ptr<io::ZeroCopyOutputStream> output(
             context->Open(filename));
         GOOGLE_CHECK(output.get());
         io::Printer printer(output.get(), '$');
@@ -3497,7 +3605,7 @@ bool Generator::GenerateAll(const std::vector<const FileDescriptor*>& files,
       if (allowed_set.count(file) == 1) {
         string filename = GetExtensionFileName(options, file);
 
-        google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+        std::unique_ptr<io::ZeroCopyOutputStream> output(
             context->Open(filename));
         GOOGLE_CHECK(output.get());
         io::Printer printer(output.get(), '$');
@@ -3533,18 +3641,26 @@ bool Generator::GenerateAll(const std::vector<const FileDescriptor*>& files,
 
       string filename =
           options.output_dir + "/" + GetJSFilename(options, file->name());
-      google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
+      std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
       GOOGLE_CHECK(output.get());
-      io::Printer printer(output.get(), '$');
+      GeneratedCodeInfo annotations;
+      io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
+          &annotations);
+      io::Printer printer(output.get(), '$',
+                          options.annotate_code ? &annotation_collector : NULL);
+
 
       GenerateFile(options, &printer, file);
 
       if (printer.failed()) {
         return false;
       }
+
+      if (options.annotate_code) {
+        EmbedCodeAnnotations(annotations, &printer);
+      }
     }
   }
-
   return true;
 }
 
diff --git a/src/google/protobuf/compiler/js/js_generator.h b/src/google/protobuf/compiler/js/js_generator.h
index 6e932d7f..3cc60e22 100755
--- a/src/google/protobuf/compiler/js/js_generator.h
+++ b/src/google/protobuf/compiler/js/js_generator.h
@@ -79,7 +79,8 @@ struct GeneratorOptions {
         library(""),
         error_on_name_conflict(false),
         extension(".js"),
-        one_output_file_per_input_file(false) {}
+        one_output_file_per_input_file(false),
+        annotate_code(false) {}
 
   bool ParseFromOptions(
       const std::vector< std::pair< string, string > >& options,
@@ -118,6 +119,9 @@ struct GeneratorOptions {
   string extension;
   // Create a separate output file for each input file?
   bool one_output_file_per_input_file;
+  // If true, we should build .meta files that contain annotations for
+  // generated code. See GeneratedCodeInfo in descriptor.proto.
+  bool annotate_code;
 };
 
 // CodeGenerator implementation which generates a JavaScript source file and
diff --git a/src/google/protobuf/compiler/js/well_known_types/any.js b/src/google/protobuf/compiler/js/well_known_types/any.js
index 22f18919..d7ca6e3a 100644
--- a/src/google/protobuf/compiler/js/well_known_types/any.js
+++ b/src/google/protobuf/compiler/js/well_known_types/any.js
@@ -69,7 +69,7 @@ proto.google.protobuf.Any.prototype.pack = function(serialized, name,
  *     the binary data properly.
  * @param {string} name The expected type name of this message object.
  * @return {?T} If the name matched the expected name, returns the deserialized
- *     object, otherwise returns undefined.
+ *     object, otherwise returns null.
  */
 proto.google.protobuf.Any.prototype.unpack = function(deserialize, name) {
   if (this.getTypeName() == name) {
diff --git a/src/google/protobuf/compiler/js/well_known_types/timestamp.js b/src/google/protobuf/compiler/js/well_known_types/timestamp.js
index 77c07bb4..b7e43f19 100644
--- a/src/google/protobuf/compiler/js/well_known_types/timestamp.js
+++ b/src/google/protobuf/compiler/js/well_known_types/timestamp.js
@@ -48,7 +48,6 @@ proto.google.protobuf.Timestamp.prototype.toDate = function() {
  * @param {!Date} value The value to set.
  */
 proto.google.protobuf.Timestamp.prototype.fromDate = function(value) {
-  var millis = value.getTime();
   this.setSeconds(Math.floor(value.getTime() / 1000));
   this.setNanos(value.getMilliseconds() * 1000000);
 };
diff --git a/src/google/protobuf/compiler/js/well_known_types_embed.cc b/src/google/protobuf/compiler/js/well_known_types_embed.cc
new file mode 100644
index 00000000..e5ee5510
--- /dev/null
+++ b/src/google/protobuf/compiler/js/well_known_types_embed.cc
@@ -0,0 +1,225 @@
+#include <google/protobuf/compiler/js/well_known_types_embed.h>
+
+struct FileToc well_known_types_js[] = {
+    {"any.js",
+     "/* This code will be inserted into generated code for\n"
+     " * google/protobuf/any.proto. */\n"
+     "\n"
+     "/**\n"
+     " * Returns the type name contained in this instance, if any.\n"
+     " * @return {string|undefined}\n"
+     " */\n"
+     "proto.google.protobuf.Any.prototype.getTypeName = function() {\n"
+     "  return this.getTypeUrl().split('/').pop();\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Packs the given message instance into this Any.\n"
+     " * @param {!Uint8Array} serialized The serialized data to pack.\n"
+     " * @param {string} name The type name of this message object.\n"
+     " * @param {string=} opt_typeUrlPrefix the type URL prefix.\n"
+     " */\n"
+     "proto.google.protobuf.Any.prototype.pack = function(serialized, name,\n"
+     "                                                    opt_typeUrlPrefix) "
+     "{\n"
+     "  if (!opt_typeUrlPrefix) {\n"
+     "    opt_typeUrlPrefix = 'type.googleapis.com/';\n"
+     "  }\n"
+     "\n"
+     "  if (opt_typeUrlPrefix.substr(-1) != '/') {\n"
+     "    this.setTypeUrl(opt_typeUrlPrefix + '/' + name);\n"
+     "  } else {\n"
+     "    this.setTypeUrl(opt_typeUrlPrefix + name);\n"
+     "  }\n"
+     "\n"
+     "  this.setValue(serialized);\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * @template T\n"
+     " * Unpacks this Any into the given message object.\n"
+     " * @param {function(Uint8Array):T} deserialize Function that will "
+     "deserialize\n"
+     " *     the binary data properly.\n"
+     " * @param {string} name The expected type name of this message object.\n"
+     " * @return {?T} If the name matched the expected name, returns the "
+     "deserialized\n"
+     " *     object, otherwise returns null.\n"
+     " */\n"
+     "proto.google.protobuf.Any.prototype.unpack = function(deserialize, name) "
+     "{\n"
+     "  if (this.getTypeName() == name) {\n"
+     "    return deserialize(this.getValue_asU8());\n"
+     "  } else {\n"
+     "    return null;\n"
+     "  }\n"
+     "};\n"},
+    {"timestamp.js",
+     "/* This code will be inserted into generated code for\n"
+     " * google/protobuf/timestamp.proto. */\n"
+     "\n"
+     "/**\n"
+     " * Returns a JavaScript 'Date' object corresponding to this Timestamp.\n"
+     " * @return {!Date}\n"
+     " */\n"
+     "proto.google.protobuf.Timestamp.prototype.toDate = function() {\n"
+     "  var seconds = this.getSeconds();\n"
+     "  var nanos = this.getNanos();\n"
+     "\n"
+     "  return new Date((seconds * 1000) + (nanos / 1000000));\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Sets the value of this Timestamp object to be the given Date.\n"
+     " * @param {!Date} value The value to set.\n"
+     " */\n"
+     "proto.google.protobuf.Timestamp.prototype.fromDate = function(value) {\n"
+     "  this.setSeconds(Math.floor(value.getTime() / 1000));\n"
+     "  this.setNanos(value.getMilliseconds() * 1000000);\n"
+     "};\n"},
+    {"struct.js",
+     "/* This code will be inserted into generated code for\n"
+     " * google/protobuf/struct.proto. */\n"
+     "\n"
+     "/**\n"
+     " * Typedef representing plain JavaScript values that can go into a\n"
+     " *     Struct.\n"
+     " * @typedef {null|number|string|boolean|Array|Object}\n"
+     " */\n"
+     "proto.google.protobuf.JavaScriptValue;\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Converts this Value object to a plain JavaScript value.\n"
+     " * @return {?proto.google.protobuf.JavaScriptValue} a plain JavaScript\n"
+     " *     value representing this Struct.\n"
+     " */\n"
+     "proto.google.protobuf.Value.prototype.toJavaScript = function() {\n"
+     "  var kindCase = proto.google.protobuf.Value.KindCase;\n"
+     "  switch (this.getKindCase()) {\n"
+     "    case kindCase.NULL_VALUE:\n"
+     "      return null;\n"
+     "    case kindCase.NUMBER_VALUE:\n"
+     "      return this.getNumberValue();\n"
+     "    case kindCase.STRING_VALUE:\n"
+     "      return this.getStringValue();\n"
+     "    case kindCase.BOOL_VALUE:\n"
+     "      return this.getBoolValue();\n"
+     "    case kindCase.STRUCT_VALUE:\n"
+     "      return this.getStructValue().toJavaScript();\n"
+     "    case kindCase.LIST_VALUE:\n"
+     "      return this.getListValue().toJavaScript();\n"
+     "    default:\n"
+     "      throw new Error('Unexpected struct type');\n"
+     "  }\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Converts this JavaScript value to a new Value proto.\n"
+     " * @param {!proto.google.protobuf.JavaScriptValue} value The value to\n"
+     " *     convert.\n"
+     " * @return {!proto.google.protobuf.Value} The newly constructed value.\n"
+     " */\n"
+     "proto.google.protobuf.Value.fromJavaScript = function(value) {\n"
+     "  var ret = new proto.google.protobuf.Value();\n"
+     "  switch (goog.typeOf(value)) {\n"
+     "    case 'string':\n"
+     "      ret.setStringValue(/** @type {string} */ (value));\n"
+     "      break;\n"
+     "    case 'number':\n"
+     "      ret.setNumberValue(/** @type {number} */ (value));\n"
+     "      break;\n"
+     "    case 'boolean':\n"
+     "      ret.setBoolValue(/** @type {boolean} */ (value));\n"
+     "      break;\n"
+     "    case 'null':\n"
+     "      ret.setNullValue(proto.google.protobuf.NullValue.NULL_VALUE);\n"
+     "      break;\n"
+     "    case 'array':\n"
+     "      ret.setListValue(proto.google.protobuf.ListValue.fromJavaScript(\n"
+     "          /** @type{!Array} */ (value)));\n"
+     "      break;\n"
+     "    case 'object':\n"
+     "      ret.setStructValue(proto.google.protobuf.Struct.fromJavaScript(\n"
+     "          /** @type{!Object} */ (value)));\n"
+     "      break;\n"
+     "    default:\n"
+     "      throw new Error('Unexpected struct type.');\n"
+     "  }\n"
+     "\n"
+     "  return ret;\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Converts this ListValue object to a plain JavaScript array.\n"
+     " * @return {!Array} a plain JavaScript array representing this List.\n"
+     " */\n"
+     "proto.google.protobuf.ListValue.prototype.toJavaScript = function() {\n"
+     "  var ret = [];\n"
+     "  var values = this.getValuesList();\n"
+     "\n"
+     "  for (var i = 0; i < values.length; i++) {\n"
+     "    ret[i] = values[i].toJavaScript();\n"
+     "  }\n"
+     "\n"
+     "  return ret;\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Constructs a ListValue protobuf from this plain JavaScript array.\n"
+     " * @param {!Array} array a plain JavaScript array\n"
+     " * @return {proto.google.protobuf.ListValue} a new ListValue object\n"
+     " */\n"
+     "proto.google.protobuf.ListValue.fromJavaScript = function(array) {\n"
+     "  var ret = new proto.google.protobuf.ListValue();\n"
+     "\n"
+     "  for (var i = 0; i < array.length; i++) {\n"
+     "    "
+     "ret.addValues(proto.google.protobuf.Value.fromJavaScript(array[i]));\n"
+     "  }\n"
+     "\n"
+     "  return ret;\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Converts this Struct object to a plain JavaScript object.\n"
+     " * @return {!Object<string, !proto.google.protobuf.JavaScriptValue>} a "
+     "plain\n"
+     " *     JavaScript object representing this Struct.\n"
+     " */\n"
+     "proto.google.protobuf.Struct.prototype.toJavaScript = function() {\n"
+     "  var ret = {};\n"
+     "\n"
+     "  this.getFieldsMap().forEach(function(value, key) {\n"
+     "    ret[key] = value.toJavaScript();\n"
+     "  });\n"
+     "\n"
+     "  return ret;\n"
+     "};\n"
+     "\n"
+     "\n"
+     "/**\n"
+     " * Constructs a Struct protobuf from this plain JavaScript object.\n"
+     " * @param {!Object} obj a plain JavaScript object\n"
+     " * @return {proto.google.protobuf.Struct} a new Struct object\n"
+     " */\n"
+     "proto.google.protobuf.Struct.fromJavaScript = function(obj) {\n"
+     "  var ret = new proto.google.protobuf.Struct();\n"
+     "  var map = ret.getFieldsMap();\n"
+     "\n"
+     "  for (var property in obj) {\n"
+     "    var val = obj[property];\n"
+     "    map.set(property, proto.google.protobuf.Value.fromJavaScript(val));\n"
+     "  }\n"
+     "\n"
+     "  return ret;\n"
+     "};\n"},
+    {NULL, NULL}  // Terminate the list.
+};
diff --git a/src/google/protobuf/compiler/main.cc b/src/google/protobuf/compiler/main.cc
index 680d6428..1db35441 100644
--- a/src/google/protobuf/compiler/main.cc
+++ b/src/google/protobuf/compiler/main.cc
@@ -40,7 +40,6 @@
 
 #ifndef OPENSOURCE_PROTOBUF_CPP_BOOTSTRAP
 #include <google/protobuf/compiler/csharp/csharp_generator.h>
-#include <google/protobuf/compiler/javanano/javanano_generator.h>
 #include <google/protobuf/compiler/js/js_generator.h>
 #include <google/protobuf/compiler/objectivec/objectivec_generator.h>
 #include <google/protobuf/compiler/php/php_generator.h>
@@ -71,11 +70,6 @@ int main(int argc, char* argv[]) {
   cli.RegisterGenerator("--python_out", &py_generator,
                         "Generate Python source file.");
 
-  // Java Nano
-  google::protobuf::compiler::javanano::JavaNanoGenerator javanano_generator;
-  cli.RegisterGenerator("--javanano_out", &javanano_generator,
-                        "Generate Java Nano source file.");
-
   // PHP
   google::protobuf::compiler::php::Generator php_generator;
   cli.RegisterGenerator("--php_out", &php_generator,
diff --git a/src/google/protobuf/compiler/mock_code_generator.cc b/src/google/protobuf/compiler/mock_code_generator.cc
index e82e6ae1..e150f97d 100644
--- a/src/google/protobuf/compiler/mock_code_generator.cc
+++ b/src/google/protobuf/compiler/mock_code_generator.cc
@@ -35,32 +35,39 @@
 #include <stdlib.h>
 #include <iostream>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
-#include <google/protobuf/compiler/plugin.pb.h>
+
+#include <google/protobuf/stubs/strutil.h>
+
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/testing/file.h>
+#include <google/protobuf/compiler/plugin.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/descriptor.h>
-#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/text_format.h>
 #include <google/protobuf/stubs/substitute.h>
 #include <gtest/gtest.h>
 
+#ifdef major
+#undef major
+#endif
+#ifdef minor
+#undef minor
+#endif
+
 namespace google {
 namespace protobuf {
 namespace compiler {
 
 // Returns the list of the names of files in all_files in the form of a
 // comma-separated string.
-string CommaSeparatedList(const std::vector<const FileDescriptor*> all_files) {
+string CommaSeparatedList(const std::vector<const FileDescriptor*>& all_files) {
   std::vector<string> names;
   for (size_t i = 0; i < all_files.size(); i++) {
     names.push_back(all_files[i]->name());
@@ -93,8 +100,7 @@ void MockCodeGenerator::ExpectGenerated(
       File::GetContents(output_directory + "/" + GetOutputFileName(name, file),
                         &content, true));
 
-  std::vector<string> lines =
-      Split(content, "\n", true);
+  std::vector<string> lines = Split(content, "\n", true);
 
   while (!lines.empty() && lines.back().empty()) {
     lines.pop_back();
@@ -128,11 +134,48 @@ void MockCodeGenerator::ExpectGenerated(
   }
 }
 
+namespace {
+void CheckSingleAnnotation(const string& expected_file,
+                           const string& expected_text,
+                           const string& file_content,
+                           const GeneratedCodeInfo::Annotation& annotation) {
+  EXPECT_EQ(expected_file, annotation.source_file());
+  ASSERT_GE(file_content.size(), annotation.begin());
+  ASSERT_GE(file_content.size(), annotation.end());
+  ASSERT_LE(annotation.begin(), annotation.end());
+  EXPECT_EQ(expected_text.size(), annotation.end() - annotation.begin());
+  EXPECT_EQ(expected_text,
+            file_content.substr(annotation.begin(), expected_text.size()));
+}
+}  // anonymous namespace
+
+void MockCodeGenerator::CheckGeneratedAnnotations(
+    const string& name, const string& file, const string& output_directory) {
+  string file_content;
+  GOOGLE_CHECK_OK(
+      File::GetContents(output_directory + "/" + GetOutputFileName(name, file),
+                        &file_content, true));
+  string meta_content;
+  GOOGLE_CHECK_OK(File::GetContents(
+      output_directory + "/" + GetOutputFileName(name, file) + ".meta",
+      &meta_content, true));
+  GeneratedCodeInfo annotations;
+  GOOGLE_CHECK(TextFormat::ParseFromString(meta_content, &annotations));
+  ASSERT_EQ(3, annotations.annotation_size());
+  CheckSingleAnnotation("first_annotation", "first", file_content,
+                        annotations.annotation(0));
+  CheckSingleAnnotation("second_annotation", "second", file_content,
+                        annotations.annotation(1));
+  CheckSingleAnnotation("third_annotation", "third", file_content,
+                        annotations.annotation(2));
+}
+
 bool MockCodeGenerator::Generate(
     const FileDescriptor* file,
     const string& parameter,
     GeneratorContext* context,
     string* error) const {
+  bool annotate = false;
   for (int i = 0; i < file->message_type_count(); i++) {
     if (HasPrefixString(file->message_type(i)->name(), "MockCodeGenerator_")) {
       string command = StripPrefixString(file->message_type(i)->name(),
@@ -161,6 +204,8 @@ bool MockCodeGenerator::Generate(
         std::cerr << "Saw json_name: "
                   << field_descriptor_proto.has_json_name() << std::endl;
         abort();
+      } else if (command == "Annotate") {
+        annotate = true;
       } else if (command == "ShowVersionNumber") {
         Version compiler_version;
         context->GetCompilerVersion(&compiler_version);
@@ -183,7 +228,7 @@ bool MockCodeGenerator::Generate(
 
     for (size_t i = 0; i < insert_into.size(); i++) {
       {
-        google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->OpenForInsert(
+        std::unique_ptr<io::ZeroCopyOutputStream> output(context->OpenForInsert(
             GetOutputFileName(insert_into[i], file), kFirstInsertionPointName));
         io::Printer printer(output.get(), '$');
         printer.PrintRaw(GetOutputFileContent(name_, "first_insert",
@@ -195,7 +240,7 @@ bool MockCodeGenerator::Generate(
       }
 
       {
-        google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+        std::unique_ptr<io::ZeroCopyOutputStream> output(
             context->OpenForInsert(GetOutputFileName(insert_into[i], file),
                                    kSecondInsertionPointName));
         io::Printer printer(output.get(), '$');
@@ -208,19 +253,43 @@ bool MockCodeGenerator::Generate(
       }
     }
   } else {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         context->Open(GetOutputFileName(name_, file)));
 
-    io::Printer printer(output.get(), '$');
-    printer.PrintRaw(GetOutputFileContent(name_, parameter,
-                                          file, context));
+    GeneratedCodeInfo annotations;
+    io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
+        &annotations);
+    io::Printer printer(output.get(), '$',
+                        annotate ? &annotation_collector : NULL);
+    printer.PrintRaw(GetOutputFileContent(name_, parameter, file, context));
+    string annotate_suffix = "_annotation";
+    if (annotate) {
+      printer.Print("$p$", "p", "first");
+      printer.Annotate("p", "first" + annotate_suffix);
+    }
     printer.PrintRaw(kFirstInsertionPoint);
+    if (annotate) {
+      printer.Print("$p$", "p", "second");
+      printer.Annotate("p", "second" + annotate_suffix);
+    }
     printer.PrintRaw(kSecondInsertionPoint);
+    if (annotate) {
+      printer.Print("$p$", "p", "third");
+      printer.Annotate("p", "third" + annotate_suffix);
+    }
 
     if (printer.failed()) {
       *error = "MockCodeGenerator detected write error.";
       return false;
     }
+    if (annotate) {
+      std::unique_ptr<io::ZeroCopyOutputStream> meta_output(
+          context->Open(GetOutputFileName(name_, file) + ".meta"));
+      if (!TextFormat::Print(annotations, meta_output.get())) {
+        *error = "MockCodeGenerator couldn't write .meta";
+        return false;
+      }
+    }
   }
 
   return true;
diff --git a/src/google/protobuf/compiler/mock_code_generator.h b/src/google/protobuf/compiler/mock_code_generator.h
index e1665f88..cdd9138c 100644
--- a/src/google/protobuf/compiler/mock_code_generator.h
+++ b/src/google/protobuf/compiler/mock_code_generator.h
@@ -68,6 +68,8 @@ namespace compiler {
 //     printing "Saw message type MockCodeGenerator_HasSourceCodeInfo: FOO." to
 //     stderr, where FOO is "1" if the supplied FileDescriptorProto has source
 //     code info, and "0" otherwise.
+//   MockCodeGenerator_Annotate:  Generate() will add annotations to its output
+//     that can later be verified with CheckGeneratedAnnotations.
 class MockCodeGenerator : public CodeGenerator {
  public:
   MockCodeGenerator(const string& name);
@@ -88,6 +90,12 @@ class MockCodeGenerator : public CodeGenerator {
                               const string& parsed_file_list,
                               const string& output_directory);
 
+  // Checks that the correct text ranges were annotated by the
+  // MockCodeGenerator_Annotate directive.
+  static void CheckGeneratedAnnotations(const string& name,
+                                        const string& file,
+                                        const string& output_directory);
+
   // Get the name of the file which would be written by the given generator.
   static string GetOutputFileName(const string& generator_name,
                                   const FileDescriptor* file);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum.cc b/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
index 02d60b3e..978e985c 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum.cc
@@ -149,7 +149,7 @@ void EnumGenerator::GenerateSource(io::Printer* printer) {
 
   printer->Print(
       "GPBEnumDescriptor *$name$_EnumDescriptor(void) {\n"
-      "  static GPBEnumDescriptor *descriptor = NULL;\n"
+      "  static _Atomic(GPBEnumDescriptor*) descriptor = nil;\n"
       "  if (!descriptor) {\n",
       "name", name_);
 
@@ -192,7 +192,8 @@ void EnumGenerator::GenerateSource(io::Printer* printer) {
         "extraTextFormatInfo", CEscape(text_format_decode_data.Data()));
     }
     printer->Print(
-      "    if (!OSAtomicCompareAndSwapPtrBarrier(nil, worker, (void * volatile *)&descriptor)) {\n"
+      "    GPBEnumDescriptor *expected = nil;\n"
+      "    if (!atomic_compare_exchange_strong(&descriptor, &expected, worker)) {\n"
       "      [worker release];\n"
       "    }\n"
       "  }\n"
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum.h b/src/google/protobuf/compiler/objectivec/objectivec_enum.h
index 0b41cf73..f52e9e68 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum.h
@@ -59,8 +59,8 @@ class EnumGenerator {
 
  private:
   const EnumDescriptor* descriptor_;
-  vector<const EnumValueDescriptor*> base_values_;
-  vector<const EnumValueDescriptor*> all_values_;
+  std::vector<const EnumValueDescriptor*> base_values_;
+  std::vector<const EnumValueDescriptor*> all_values_;
   const string name_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumGenerator);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
index 7a774a09..8899a13a 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.cc
@@ -46,7 +46,7 @@ namespace objectivec {
 namespace {
 
 void SetEnumVariables(const FieldDescriptor* descriptor,
-                      map<string, string>* variables) {
+                      std::map<string, string>* variables) {
   string type = EnumName(descriptor->enum_type());
   (*variables)["storage_type"] = type;
   // For non repeated fields, if it was defined in a different file, the
@@ -118,7 +118,7 @@ void EnumFieldGenerator::GenerateCFunctionImplementations(
 }
 
 void EnumFieldGenerator::DetermineForwardDeclarations(
-    set<string>* fwd_decls) const {
+    std::set<string>* fwd_decls) const {
   SingleFieldGenerator::DetermineForwardDeclarations(fwd_decls);
   // If it is an enum defined in a different file, then we'll need a forward
   // declaration for it.  When it is in our file, all the enums are output
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
index 946faa81..ae56c069 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_enum_field.h
@@ -47,7 +47,7 @@ class EnumFieldGenerator : public SingleFieldGenerator {
  public:
   virtual void GenerateCFunctionDeclarations(io::Printer* printer) const;
   virtual void GenerateCFunctionImplementations(io::Printer* printer) const;
-  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+  virtual void DetermineForwardDeclarations(std::set<string>* fwd_decls) const;
 
  protected:
   EnumFieldGenerator(const FieldDescriptor* descriptor, const Options& options);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_extension.cc b/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
index 7073173c..b788d0a3 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_extension.cc
@@ -49,9 +49,9 @@ ExtensionGenerator::ExtensionGenerator(const string& root_class_name,
   if (descriptor->is_map()) {
     // NOTE: src/google/protobuf/compiler/plugin.cc makes use of cerr for some
     // error cases, so it seems to be ok to use as a back door for errors.
-    cerr << "error: Extension is a map<>!"
-         << " That used to be blocked by the compiler." << endl;
-    cerr.flush();
+    std::cerr << "error: Extension is a map<>!"
+         << " That used to be blocked by the compiler." << std::endl;
+    std::cerr.flush();
     abort();
   }
 }
@@ -59,7 +59,7 @@ ExtensionGenerator::ExtensionGenerator(const string& root_class_name,
 ExtensionGenerator::~ExtensionGenerator() {}
 
 void ExtensionGenerator::GenerateMembersHeader(io::Printer* printer) {
-  map<string, string> vars;
+  std::map<string, string> vars;
   vars["method_name"] = method_name_;
   SourceLocation location;
   if (descriptor_->GetSourceLocation(&location)) {
@@ -77,7 +77,7 @@ void ExtensionGenerator::GenerateMembersHeader(io::Printer* printer) {
 
 void ExtensionGenerator::GenerateStaticVariablesInitialization(
     io::Printer* printer) {
-  map<string, string> vars;
+  std::map<string, string> vars;
   vars["root_class_and_method_name"] = root_class_and_method_name_;
   vars["extended_type"] = ClassName(descriptor_->containing_type());
   vars["number"] = SimpleItoa(descriptor_->number());
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_field.cc
index 527b7c0c..f74599ba 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_field.cc
@@ -49,7 +49,7 @@ namespace objectivec {
 namespace {
 
 void SetCommonFieldVariables(const FieldDescriptor* descriptor,
-                             map<string, string>* variables) {
+                             std::map<string, string>* variables) {
   string camel_case_name = FieldName(descriptor);
   string raw_field_name;
   if (descriptor->type() == FieldDescriptor::TYPE_GROUP) {
@@ -178,7 +178,7 @@ void FieldGenerator::GenerateCFunctionImplementations(
 }
 
 void FieldGenerator::DetermineForwardDeclarations(
-    set<string>* fwd_decls) const {
+    std::set<string>* fwd_decls) const {
   // Nothing
 }
 
@@ -228,8 +228,8 @@ int FieldGenerator::ExtraRuntimeHasBitsNeeded(void) const {
 void FieldGenerator::SetExtraRuntimeHasBitsBase(int index_base) {
   // NOTE: src/google/protobuf/compiler/plugin.cc makes use of cerr for some
   // error cases, so it seems to be ok to use as a back door for errors.
-  cerr << "Error: should have overridden SetExtraRuntimeHasBitsBase()." << endl;
-  cerr.flush();
+  std::cerr << "Error: should have overridden SetExtraRuntimeHasBitsBase()." << std::endl;
+  std::cerr.flush();
   abort();
 }
 
@@ -410,10 +410,8 @@ bool RepeatedFieldGenerator::RuntimeUsesHasBit(void) const {
 FieldGeneratorMap::FieldGeneratorMap(const Descriptor* descriptor,
                                      const Options& options)
     : descriptor_(descriptor),
-      field_generators_(
-          new scoped_ptr<FieldGenerator>[descriptor->field_count()]),
-      extension_generators_(
-          new scoped_ptr<FieldGenerator>[descriptor->extension_count()]) {
+      field_generators_(descriptor->field_count()),
+      extension_generators_(descriptor->extension_count()) {
   // Construct all the FieldGenerators.
   for (int i = 0; i < descriptor->field_count(); i++) {
     field_generators_[i].reset(
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_field.h b/src/google/protobuf/compiler/objectivec/objectivec_field.h
index a3a4b1b6..216034d0 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_field.h
@@ -67,7 +67,7 @@ class FieldGenerator {
   virtual void GenerateCFunctionImplementations(io::Printer* printer) const;
 
   // Exposed for subclasses, should always call it on the parent class also.
-  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+  virtual void DetermineForwardDeclarations(std::set<string>* fwd_decls) const;
 
   // Used during generation, not intended to be extended by subclasses.
   void GenerateFieldDescription(
@@ -100,7 +100,7 @@ class FieldGenerator {
   virtual bool WantsHasProperty(void) const = 0;
 
   const FieldDescriptor* descriptor_;
-  map<string, string> variables_;
+  std::map<string, string> variables_;
 
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
@@ -182,8 +182,8 @@ class FieldGeneratorMap {
 
  private:
   const Descriptor* descriptor_;
-  scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
-  scoped_array<scoped_ptr<FieldGenerator> > extension_generators_;
+  std::vector<std::unique_ptr<FieldGenerator>> field_generators_;
+  std::vector<std::unique_ptr<FieldGenerator>> extension_generators_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
 };
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_file.cc b/src/google/protobuf/compiler/objectivec/objectivec_file.cc
index 7ad127bb..f0d9b4d5 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_file.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_file.cc
@@ -56,6 +56,20 @@ const int32 GOOGLE_PROTOBUF_OBJC_VERSION = 30002;
 
 const char* kHeaderExtension = ".pbobjc.h";
 
+// Checks if a message contains any enums definitions (on the message or
+// a nested message under it).
+bool MessageContainsEnums(const Descriptor* message) {
+  if (message->enum_type_count() > 0) {
+    return true;
+  }
+  for (int i = 0; i < message->nested_type_count(); i++) {
+    if (MessageContainsEnums(message->nested_type(i))) {
+      return true;
+    }
+  }
+  return false;
+}
+
 // Checks if a message contains any extension definitions (on the message or
 // a nested message under it).
 bool MessageContainsExtensions(const Descriptor* message) {
@@ -70,6 +84,20 @@ bool MessageContainsExtensions(const Descriptor* message) {
   return false;
 }
 
+// Checks if the file contains any enum definitions (at the root or
+// nested under a message).
+bool FileContainsEnums(const FileDescriptor* file) {
+  if (file->enum_type_count() > 0) {
+    return true;
+  }
+  for (int i = 0; i < file->message_type_count(); i++) {
+    if (MessageContainsEnums(file->message_type(i))) {
+      return true;
+    }
+  }
+  return false;
+}
+
 // Checks if the file contains any extensions definitions (at the root or
 // nested under a message).
 bool FileContainsExtensions(const FileDescriptor* file) {
@@ -88,9 +116,9 @@ bool FileContainsExtensions(const FileDescriptor* file) {
 // deps as visited and prunes them from the needed files list.
 void PruneFileAndDepsMarkingAsVisited(
     const FileDescriptor* file,
-    vector<const FileDescriptor*>* files,
-    set<const FileDescriptor*>* files_visited) {
-  vector<const FileDescriptor*>::iterator iter =
+    std::vector<const FileDescriptor*>* files,
+    std::set<const FileDescriptor*>* files_visited) {
+  std::vector<const FileDescriptor*>::iterator iter =
       std::find(files->begin(), files->end(), file);
   if (iter != files->end()) {
     files->erase(iter);
@@ -104,8 +132,8 @@ void PruneFileAndDepsMarkingAsVisited(
 // Helper for CollectMinimalFileDepsContainingExtensions.
 void CollectMinimalFileDepsContainingExtensionsWorker(
     const FileDescriptor* file,
-    vector<const FileDescriptor*>* files,
-    set<const FileDescriptor*>* files_visited) {
+    std::vector<const FileDescriptor*>* files,
+    std::set<const FileDescriptor*>* files_visited) {
   if (files_visited->find(file) != files_visited->end()) {
     return;
   }
@@ -137,8 +165,8 @@ void CollectMinimalFileDepsContainingExtensionsWorker(
 // specifically).
 void CollectMinimalFileDepsContainingExtensions(
     const FileDescriptor* file,
-    vector<const FileDescriptor*>* files) {
-  set<const FileDescriptor*> files_visited;
+    std::vector<const FileDescriptor*>* files) {
+  std::set<const FileDescriptor*> files_visited;
   for (int i = 0; i < file->dependency_count(); i++) {
     const FileDescriptor* dep = file->dependency(i);
     CollectMinimalFileDepsContainingExtensionsWorker(dep, files,
@@ -160,6 +188,7 @@ bool IsDirectDependency(const FileDescriptor* dep, const FileDescriptor* file) {
 FileGenerator::FileGenerator(const FileDescriptor *file, const Options& options)
     : file_(file),
       root_class_name_(FileClassName(file)),
+      is_bundled_proto_(IsProtobufLibraryBundledProtoFile(file)),
       options_(options) {
   for (int i = 0; i < file_->enum_type_count(); i++) {
     EnumGenerator *generator = new EnumGenerator(file_->enum_type(i));
@@ -186,7 +215,17 @@ FileGenerator::~FileGenerator() {
 }
 
 void FileGenerator::GenerateHeader(io::Printer *printer) {
-  PrintFileRuntimePreamble(printer, "GPBProtocolBuffers.h");
+  std::set<string> headers;
+  // Generated files bundled with the library get minimal imports, everything
+  // else gets the wrapper so everything is usable.
+  if (is_bundled_proto_) {
+    headers.insert("GPBRootObject.h");
+    headers.insert("GPBMessage.h");
+    headers.insert("GPBDescriptor.h");
+  } else {
+    headers.insert("GPBProtocolBuffers.h");
+  }
+  PrintFileRuntimePreamble(printer, headers);
 
   // Add some verification that the generated code matches the source the
   // code is being compiled with.
@@ -208,7 +247,8 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
   {
     ImportWriter import_writer(
         options_.generate_for_named_framework,
-        options_.named_framework_to_proto_path_mappings_path);
+        options_.named_framework_to_proto_path_mappings_path,
+        is_bundled_proto_);
     const string header_extension(kHeaderExtension);
     for (int i = 0; i < file_->public_dependency_count(); i++) {
       import_writer.AddFile(file_->public_dependency(i), header_extension);
@@ -229,12 +269,12 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
       "CF_EXTERN_C_BEGIN\n"
       "\n");
 
-  set<string> fwd_decls;
-  for (vector<MessageGenerator *>::iterator iter = message_generators_.begin();
+  std::set<string> fwd_decls;
+  for (std::vector<MessageGenerator *>::iterator iter = message_generators_.begin();
        iter != message_generators_.end(); ++iter) {
     (*iter)->DetermineForwardDeclarations(&fwd_decls);
   }
-  for (set<string>::const_iterator i(fwd_decls.begin());
+  for (std::set<string>::const_iterator i(fwd_decls.begin());
        i != fwd_decls.end(); ++i) {
     printer->Print("$value$;\n", "value", *i);
   }
@@ -247,12 +287,12 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
       "\n");
 
   // need to write out all enums first
-  for (vector<EnumGenerator *>::iterator iter = enum_generators_.begin();
+  for (std::vector<EnumGenerator *>::iterator iter = enum_generators_.begin();
        iter != enum_generators_.end(); ++iter) {
     (*iter)->GenerateHeader(printer);
   }
 
-  for (vector<MessageGenerator *>::iterator iter = message_generators_.begin();
+  for (std::vector<MessageGenerator *>::iterator iter = message_generators_.begin();
        iter != message_generators_.end(); ++iter) {
     (*iter)->GenerateEnumHeader(printer);
   }
@@ -283,7 +323,7 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
         "@interface $root_class_name$ (DynamicMethods)\n",
         "root_class_name", root_class_name_);
 
-    for (vector<ExtensionGenerator *>::iterator iter =
+    for (std::vector<ExtensionGenerator *>::iterator iter =
              extension_generators_.begin();
          iter != extension_generators_.end(); ++iter) {
       (*iter)->GenerateMembersHeader(printer);
@@ -292,7 +332,7 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
     printer->Print("@end\n\n");
   }  // extension_generators_.size() > 0
 
-  for (vector<MessageGenerator *>::iterator iter = message_generators_.begin();
+  for (std::vector<MessageGenerator *>::iterator iter = message_generators_.begin();
        iter != message_generators_.end(); ++iter) {
     (*iter)->GenerateMessageHeader(printer);
   }
@@ -309,15 +349,25 @@ void FileGenerator::GenerateHeader(io::Printer *printer) {
 
 void FileGenerator::GenerateSource(io::Printer *printer) {
   // #import the runtime support.
-  PrintFileRuntimePreamble(printer, "GPBProtocolBuffers_RuntimeSupport.h");
+  std::set<string> headers;
+  headers.insert("GPBProtocolBuffers_RuntimeSupport.h");
+  PrintFileRuntimePreamble(printer, headers);
+
+  // Enums use atomic in the generated code, so add the system import as needed.
+  if (FileContainsEnums(file_)) {
+    printer->Print(
+        "#import <stdatomic.h>\n"
+        "\n");
+  }
 
-  vector<const FileDescriptor*> deps_with_extensions;
+  std::vector<const FileDescriptor*> deps_with_extensions;
   CollectMinimalFileDepsContainingExtensions(file_, &deps_with_extensions);
 
   {
     ImportWriter import_writer(
         options_.generate_for_named_framework,
-        options_.named_framework_to_proto_path_mappings_path);
+        options_.named_framework_to_proto_path_mappings_path,
+        is_bundled_proto_);
     const string header_extension(kHeaderExtension);
 
     // #import the header for this proto file.
@@ -325,7 +375,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
 
     // #import the headers for anything that a plain dependency of this proto
     // file (that means they were just an include, not a "public" include).
-    set<string> public_import_names;
+    std::set<string> public_import_names;
     for (int i = 0; i < file_->public_dependency_count(); i++) {
       public_import_names.insert(file_->public_dependency(i)->name());
     }
@@ -341,7 +391,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
     // imported so it can get merged into the root's extensions registry.
     // See the Note by CollectMinimalFileDepsContainingExtensions before
     // changing this.
-    for (vector<const FileDescriptor *>::iterator iter =
+    for (std::vector<const FileDescriptor *>::iterator iter =
              deps_with_extensions.begin();
          iter != deps_with_extensions.end(); ++iter) {
       if (!IsDirectDependency(*iter, file_)) {
@@ -353,7 +403,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
   }
 
   bool includes_oneof = false;
-  for (vector<MessageGenerator *>::iterator iter = message_generators_.begin();
+  for (std::vector<MessageGenerator *>::iterator iter = message_generators_.begin();
        iter != message_generators_.end(); ++iter) {
     if ((*iter)->IncludesOneOfDefinition()) {
       includes_oneof = true;
@@ -406,12 +456,12 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
       printer->Print(
           "static GPBExtensionDescription descriptions[] = {\n");
       printer->Indent();
-      for (vector<ExtensionGenerator *>::iterator iter =
+      for (std::vector<ExtensionGenerator *>::iterator iter =
                extension_generators_.begin();
            iter != extension_generators_.end(); ++iter) {
         (*iter)->GenerateStaticVariablesInitialization(printer);
       }
-      for (vector<MessageGenerator *>::iterator iter =
+      for (std::vector<MessageGenerator *>::iterator iter =
                message_generators_.begin();
            iter != message_generators_.end(); ++iter) {
         (*iter)->GenerateStaticVariablesInitialization(printer);
@@ -435,7 +485,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
     } else {
       printer->Print(
           "// Merge in the imports (direct or indirect) that defined extensions.\n");
-      for (vector<const FileDescriptor *>::iterator iter =
+      for (std::vector<const FileDescriptor *>::iterator iter =
                deps_with_extensions.begin();
            iter != deps_with_extensions.end(); ++iter) {
         const string root_class_name(FileClassName((*iter)));
@@ -468,7 +518,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
 
   // File descriptor only needed if there are messages to use it.
   if (message_generators_.size() > 0) {
-    map<string, string> vars;
+    std::map<string, string> vars;
     vars["root_class_name"] = root_class_name_;
     vars["package"] = file_->package();
     vars["objc_prefix"] = FileClassPrefix(file_);
@@ -511,11 +561,11 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
         "\n");
   }
 
-  for (vector<EnumGenerator *>::iterator iter = enum_generators_.begin();
+  for (std::vector<EnumGenerator *>::iterator iter = enum_generators_.begin();
        iter != enum_generators_.end(); ++iter) {
     (*iter)->GenerateSource(printer);
   }
-  for (vector<MessageGenerator *>::iterator iter = message_generators_.begin();
+  for (std::vector<MessageGenerator *>::iterator iter = message_generators_.begin();
        iter != message_generators_.end(); ++iter) {
     (*iter)->GenerateSource(printer);
   }
@@ -531,7 +581,7 @@ void FileGenerator::GenerateSource(io::Printer *printer) {
 // files. This currently only supports the runtime coming from a framework
 // as defined by the official CocoaPod.
 void FileGenerator::PrintFileRuntimePreamble(
-    io::Printer* printer, const string& header_to_import) const {
+    io::Printer* printer, const std::set<string>& headers_to_import) const {
   printer->Print(
       "// Generated by the protocol buffer compiler.  DO NOT EDIT!\n"
       "// source: $filename$\n"
@@ -540,6 +590,7 @@ void FileGenerator::PrintFileRuntimePreamble(
 
   const string framework_name(ProtobufLibraryFrameworkName);
   const string cpp_symbol(ProtobufFrameworkImportSymbol(framework_name));
+
   printer->Print(
       "// This CPP symbol can be defined to use imports that match up to the framework\n"
       "// imports needed when using CocoaPods.\n"
@@ -547,15 +598,31 @@ void FileGenerator::PrintFileRuntimePreamble(
       " #define $cpp_symbol$ 0\n"
       "#endif\n"
       "\n"
-      "#if $cpp_symbol$\n"
-      " #import <$framework_name$/$header$>\n"
-      "#else\n"
-      " #import \"$header$\"\n"
+      "#if $cpp_symbol$\n",
+      "cpp_symbol", cpp_symbol);
+
+
+  for (std::set<string>::const_iterator iter = headers_to_import.begin();
+       iter != headers_to_import.end(); ++iter) {
+    printer->Print(
+        " #import <$framework_name$/$header$>\n",
+        "header", *iter,
+        "framework_name", framework_name);
+  }
+
+  printer->Print(
+      "#else\n");
+
+  for (std::set<string>::const_iterator iter = headers_to_import.begin();
+       iter != headers_to_import.end(); ++iter) {
+    printer->Print(
+        " #import \"$header$\"\n",
+        "header", *iter);
+  }
+
+  printer->Print(
       "#endif\n"
-      "\n",
-      "cpp_symbol", cpp_symbol,
-      "header", header_to_import,
-      "framework_name", framework_name);
+      "\n");
 }
 
 }  // namespace objectivec
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_file.h b/src/google/protobuf/compiler/objectivec/objectivec_file.h
index a60a6885..1754fc0a 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_file.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_file.h
@@ -66,15 +66,16 @@ class FileGenerator {
  private:
   const FileDescriptor* file_;
   string root_class_name_;
+  bool is_bundled_proto_;
 
-  vector<EnumGenerator*> enum_generators_;
-  vector<MessageGenerator*> message_generators_;
-  vector<ExtensionGenerator*> extension_generators_;
+  std::vector<EnumGenerator*> enum_generators_;
+  std::vector<MessageGenerator*> message_generators_;
+  std::vector<ExtensionGenerator*> extension_generators_;
 
   const Options options_;
 
   void PrintFileRuntimePreamble(
-      io::Printer* printer, const string& header_to_import) const;
+      io::Printer* printer, const std::set<string>& headers_to_import) const;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileGenerator);
 };
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_generator.cc b/src/google/protobuf/compiler/objectivec/objectivec_generator.cc
index 36407467..e0597cc7 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_generator.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_generator.cc
@@ -57,7 +57,7 @@ bool ObjectiveCGenerator::Generate(const FileDescriptor* file,
   return false;
 }
 
-bool ObjectiveCGenerator::GenerateAll(const vector<const FileDescriptor*>& files,
+bool ObjectiveCGenerator::GenerateAll(const std::vector<const FileDescriptor*>& files,
                                       const string& parameter,
                                       GeneratorContext* context,
                                       string* error) const {
@@ -71,7 +71,7 @@ bool ObjectiveCGenerator::GenerateAll(const vector<const FileDescriptor*>& files
 
   Options generation_options;
 
-  vector<pair<string, string> > options;
+  std::vector<std::pair<string, string> > options;
   ParseGeneratorParameter(parameter, &options);
   for (int i = 0; i < options.size(); i++) {
     if (options[i].first == "expected_prefixes_path") {
@@ -142,7 +142,7 @@ bool ObjectiveCGenerator::GenerateAll(const vector<const FileDescriptor*>& files
 
     // Generate header.
     {
-      scoped_ptr<io::ZeroCopyOutputStream> output(
+      std::unique_ptr<io::ZeroCopyOutputStream> output(
           context->Open(filepath + ".pbobjc.h"));
       io::Printer printer(output.get(), '$');
       file_generator.GenerateHeader(&printer);
@@ -150,7 +150,7 @@ bool ObjectiveCGenerator::GenerateAll(const vector<const FileDescriptor*>& files
 
     // Generate m file.
     {
-      scoped_ptr<io::ZeroCopyOutputStream> output(
+      std::unique_ptr<io::ZeroCopyOutputStream> output(
           context->Open(filepath + ".pbobjc.m"));
       io::Printer printer(output.get(), '$');
       file_generator.GenerateSource(&printer);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_generator.h b/src/google/protobuf/compiler/objectivec/objectivec_generator.h
index b1723318..3e43f732 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_generator.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_generator.h
@@ -56,7 +56,7 @@ class LIBPROTOC_EXPORT ObjectiveCGenerator : public CodeGenerator {
                 const string& parameter,
                 GeneratorContext* context,
                 string* error) const;
-  bool GenerateAll(const vector<const FileDescriptor*>& files,
+  bool GenerateAll(const std::vector<const FileDescriptor*>& files,
                    const string& parameter,
                    GeneratorContext* context,
                    string* error) const;
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc b/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
index c7fd96ac..df71c8bb 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_helpers.cc
@@ -28,9 +28,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifdef _MSC_VER
-#include <io.h>
-#else
+#ifndef _MSC_VER
 #include <unistd.h>
 #endif
 #include <climits>
@@ -49,8 +47,10 @@
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/io_win32.h>
 #include <google/protobuf/stubs/strutil.h>
 
+
 // NOTE: src/google/protobuf/compiler/plugin.cc makes use of cerr for some
 // error cases, so it seems to be ok to use as a back door for errors.
 
@@ -59,6 +59,16 @@ namespace protobuf {
 namespace compiler {
 namespace objectivec {
 
+// <io.h> is transitively included in this file. Import the functions explicitly
+// in this port namespace to avoid ambiguous definition.
+namespace posix {
+#ifdef _WIN32
+using ::google::protobuf::internal::win32::open;
+#else
+using ::open;
+#endif
+}  // namespace port
+
 Options::Options() {
   // Default is the value of the env for the package prefixes.
   const char* file_path = getenv("GPB_OBJC_EXPECTED_PACKAGE_PREFIXES");
@@ -90,7 +100,7 @@ bool ascii_isnewline(char c) {
 // Do not expose this outside of helpers, stick to having functions for specific
 // cases (ClassName(), FieldName()), so there is always consistent suffix rules.
 string UnderscoresToCamelCase(const string& input, bool first_capitalized) {
-  vector<string> values;
+  std::vector<string> values;
   string current;
 
   bool last_char_was_number = false;
@@ -131,7 +141,7 @@ string UnderscoresToCamelCase(const string& input, bool first_capitalized) {
 
   string result;
   bool first_segment_forces_upper = false;
-  for (vector<string>::iterator i = values.begin(); i != values.end(); ++i) {
+  for (std::vector<string>::iterator i = values.begin(); i != values.end(); ++i) {
     string value = *i;
     bool all_upper = (kUpperSegments.count(value) > 0);
     if (all_upper && (result.length() == 0)) {
@@ -196,7 +206,7 @@ const char* const kReservedWordList[] = {
     // method declared in protos. The main cases are methods
     // that take no arguments, or setFoo:/hasFoo: type methods.
     "clear", "data", "delimitedData", "descriptor", "extensionRegistry",
-    "extensionsCurrentlySet", "isInitialized", "serializedSize",
+    "extensionsCurrentlySet", "initialized", "isInitialized", "serializedSize",
     "sortedExtensionsInUse", "unknownFields",
 
     // MacTypes.h names
@@ -854,7 +864,7 @@ bool HasNonZeroDefaultValue(const FieldDescriptor* field) {
 }
 
 string BuildFlagsString(const FlagType flag_type,
-                        const vector<string>& strings) {
+                        const std::vector<string>& strings) {
   if (strings.size() == 0) {
     return GetZeroEnumNameForFlagType(flag_type);
   } else if (strings.size() == 1) {
@@ -876,7 +886,7 @@ string BuildCommentsString(const SourceLocation& location,
   const string& comments = location.leading_comments.empty()
                                ? location.trailing_comments
                                : location.leading_comments;
-  vector<string> lines;
+  std::vector<string> lines;
   SplitStringAllowEmpty(comments, "\n", &lines);
   while (!lines.empty() && lines.back().empty()) {
     lines.pop_back();
@@ -980,13 +990,13 @@ namespace {
 
 class ExpectedPrefixesCollector : public LineConsumer {
  public:
-  ExpectedPrefixesCollector(map<string, string>* inout_package_to_prefix_map)
+  ExpectedPrefixesCollector(std::map<string, string>* inout_package_to_prefix_map)
       : prefix_map_(inout_package_to_prefix_map) {}
 
   virtual bool ConsumeLine(const StringPiece& line, string* out_error);
 
  private:
-  map<string, string>* prefix_map_;
+  std::map<string, string>* prefix_map_;
 };
 
 bool ExpectedPrefixesCollector::ConsumeLine(
@@ -1009,7 +1019,7 @@ bool ExpectedPrefixesCollector::ConsumeLine(
 }
 
 bool LoadExpectedPackagePrefixes(const Options &generation_options,
-                                 map<string, string>* prefix_map,
+                                 std::map<string, string>* prefix_map,
                                  string* out_error) {
   if (generation_options.expected_prefixes_path.empty()) {
     return true;
@@ -1023,7 +1033,7 @@ bool LoadExpectedPackagePrefixes(const Options &generation_options,
 bool ValidateObjCClassPrefix(
     const FileDescriptor* file,
     const string& expected_prefixes_path,
-    const map<string, string>& expected_package_prefixes,
+    const std::map<string, string>& expected_package_prefixes,
     string* out_error) {
   const string prefix = file->options().objc_class_prefix();
   const string package = file->package();
@@ -1033,7 +1043,7 @@ bool ValidateObjCClassPrefix(
 
   // Check: Error - See if there was an expected prefix for the package and
   // report if it doesn't match (wrong or missing).
-  map<string, string>::const_iterator package_match =
+  std::map<string, string>::const_iterator package_match =
       expected_package_prefixes.find(package);
   if (package_match != expected_package_prefixes.end()) {
     // There was an entry, and...
@@ -1063,26 +1073,26 @@ bool ValidateObjCClassPrefix(
   // to Apple's rules (the checks above implicitly whitelist anything that
   // doesn't meet these rules).
   if (!ascii_isupper(prefix[0])) {
-    cerr << endl
+    std::cerr << std::endl
          << "protoc:0: warning: Invalid 'option objc_class_prefix = \""
          << prefix << "\";' in '" << file->name() << "';"
-         << " it should start with a capital letter." << endl;
-    cerr.flush();
+         << " it should start with a capital letter." << std::endl;
+    std::cerr.flush();
   }
   if (prefix.length() < 3) {
     // Apple reserves 2 character prefixes for themselves. They do use some
     // 3 character prefixes, but they haven't updated the rules/docs.
-    cerr << endl
+    std::cerr << std::endl
          << "protoc:0: warning: Invalid 'option objc_class_prefix = \""
          << prefix << "\";' in '" << file->name() << "';"
          << " Apple recommends they should be at least 3 characters long."
-         << endl;
-    cerr.flush();
+         << std::endl;
+    std::cerr.flush();
   }
 
   // Look for any other package that uses the same prefix.
   string other_package_for_prefix;
-  for (map<string, string>::const_iterator i = expected_package_prefixes.begin();
+  for (std::map<string, string>::const_iterator i = expected_package_prefixes.begin();
        i != expected_package_prefixes.end(); ++i) {
     if (i->second == prefix) {
       other_package_for_prefix = i->first;
@@ -1096,22 +1106,22 @@ bool ValidateObjCClassPrefix(
     // The file does not have a package and ...
     if (other_package_for_prefix.empty()) {
       // ... no other package has declared that prefix.
-      cerr << endl
+      std::cerr << std::endl
            << "protoc:0: warning: File '" << file->name() << "' has no "
            << "package. Consider adding a new package to the proto and adding '"
            << "new.package = " << prefix << "' to the expected prefixes file ("
-           << expected_prefixes_path << ")." << endl;
-      cerr.flush();
+           << expected_prefixes_path << ")." << std::endl;
+      std::cerr.flush();
     } else {
       // ... another package has declared the same prefix.
-      cerr << endl
+      std::cerr << std::endl
            << "protoc:0: warning: File '" << file->name() << "' has no package "
            << "and package '" << other_package_for_prefix << "' already uses '"
            << prefix << "' as its prefix. Consider either adding a new package "
            << "to the proto, or reusing one of the packages already using this "
            << "prefix in the expected prefixes file ("
-           << expected_prefixes_path << ")." << endl;
-      cerr.flush();
+           << expected_prefixes_path << ")." << std::endl;
+      std::cerr.flush();
     }
     return true;
   }
@@ -1133,12 +1143,12 @@ bool ValidateObjCClassPrefix(
   // Check: Warning - If the given package/prefix pair wasn't expected, issue a
   // warning issue a warning suggesting it gets added to the file.
   if (!expected_package_prefixes.empty()) {
-    cerr << endl
+    std::cerr << std::endl
          << "protoc:0: warning: Found unexpected 'option objc_class_prefix = \""
          << prefix << "\";' in '" << file->name() << "';"
          << " consider adding it to the expected prefixes file ("
-         << expected_prefixes_path << ")." << endl;
-    cerr.flush();
+         << expected_prefixes_path << ")." << std::endl;
+    std::cerr.flush();
   }
 
   return true;
@@ -1146,11 +1156,11 @@ bool ValidateObjCClassPrefix(
 
 }  // namespace
 
-bool ValidateObjCClassPrefixes(const vector<const FileDescriptor*>& files,
+bool ValidateObjCClassPrefixes(const std::vector<const FileDescriptor*>& files,
                                const Options& generation_options,
                                string* out_error) {
   // Load the expected package prefixes, if available, to validate against.
-  map<string, string> expected_package_prefixes;
+  std::map<string, string> expected_package_prefixes;
   if (!LoadExpectedPackagePrefixes(generation_options,
                                    &expected_package_prefixes,
                                    out_error)) {
@@ -1177,13 +1187,13 @@ TextFormatDecodeData::~TextFormatDecodeData() { }
 void TextFormatDecodeData::AddString(int32 key,
                                      const string& input_for_decode,
                                      const string& desired_output) {
-  for (vector<DataEntry>::const_iterator i = entries_.begin();
+  for (std::vector<DataEntry>::const_iterator i = entries_.begin();
        i != entries_.end(); ++i) {
     if (i->first == key) {
-      cerr << "error: duplicate key (" << key
+      std::cerr << "error: duplicate key (" << key
            << ") making TextFormat data, input: \"" << input_for_decode
-           << "\", desired: \"" << desired_output << "\"." << endl;
-      cerr.flush();
+           << "\", desired: \"" << desired_output << "\"." << std::endl;
+      std::cerr.flush();
       abort();
     }
   }
@@ -1194,14 +1204,14 @@ void TextFormatDecodeData::AddString(int32 key,
 }
 
 string TextFormatDecodeData::Data() const {
-  ostringstream data_stringstream;
+  std::ostringstream data_stringstream;
 
   if (num_entries() > 0) {
     io::OstreamOutputStream data_outputstream(&data_stringstream);
     io::CodedOutputStream output_stream(&data_outputstream);
 
     output_stream.WriteVarint32(num_entries());
-    for (vector<DataEntry>::const_iterator i = entries_.begin();
+    for (std::vector<DataEntry>::const_iterator i = entries_.begin();
          i != entries_.end(); ++i) {
       output_stream.WriteVarint32(i->first);
       output_stream.WriteString(i->second);
@@ -1335,18 +1345,18 @@ string DirectDecodeString(const string& str) {
 string TextFormatDecodeData::DecodeDataForString(const string& input_for_decode,
                                                  const string& desired_output) {
   if ((input_for_decode.size() == 0) || (desired_output.size() == 0)) {
-    cerr << "error: got empty string for making TextFormat data, input: \""
+    std::cerr << "error: got empty string for making TextFormat data, input: \""
          << input_for_decode << "\", desired: \"" << desired_output << "\"."
-         << endl;
-    cerr.flush();
+         << std::endl;
+    std::cerr.flush();
     abort();
   }
   if ((input_for_decode.find('\0') != string::npos) ||
       (desired_output.find('\0') != string::npos)) {
-    cerr << "error: got a null char in a string for making TextFormat data,"
+    std::cerr << "error: got a null char in a string for making TextFormat data,"
          << " input: \"" << CEscape(input_for_decode) << "\", desired: \""
-         << CEscape(desired_output) << "\"." << endl;
-    cerr.flush();
+         << CEscape(desired_output) << "\"." << std::endl;
+    std::cerr.flush();
     abort();
   }
 
@@ -1464,7 +1474,7 @@ bool ParseSimpleFile(
     const string& path, LineConsumer* line_consumer, string* out_error) {
   int fd;
   do {
-    fd = open(path.c_str(), O_RDONLY);
+    fd = posix::open(path.c_str(), O_RDONLY);
   } while (fd < 0 && errno == EINTR);
   if (fd < 0) {
     *out_error =
@@ -1494,10 +1504,12 @@ bool ParseSimpleFile(
 
 ImportWriter::ImportWriter(
   const string& generate_for_named_framework,
-  const string& named_framework_to_proto_path_mappings_path)
+  const string& named_framework_to_proto_path_mappings_path,
+  bool include_wkt_imports)
     : generate_for_named_framework_(generate_for_named_framework),
       named_framework_to_proto_path_mappings_path_(
           named_framework_to_proto_path_mappings_path),
+      include_wkt_imports_(include_wkt_imports),
       need_to_parse_mapping_file_(true) {
 }
 
@@ -1508,9 +1520,14 @@ void ImportWriter::AddFile(const FileDescriptor* file,
   const string file_path(FilePath(file));
 
   if (IsProtobufLibraryBundledProtoFile(file)) {
-    protobuf_framework_imports_.push_back(
-        FilePathBasename(file) + header_extension);
-    protobuf_non_framework_imports_.push_back(file_path + header_extension);
+    // The imports of the WKTs are only needed within the library itself,
+    // in other cases, they get skipped because the generated code already
+    // import GPBProtocolBuffers.h and hence proves them.
+    if (include_wkt_imports_) {
+      protobuf_framework_imports_.push_back(
+          FilePathBasename(file) + header_extension);
+      protobuf_non_framework_imports_.push_back(file_path + header_extension);
+    }
     return;
   }
 
@@ -1519,7 +1536,7 @@ void ImportWriter::AddFile(const FileDescriptor* file,
     ParseFrameworkMappings();
   }
 
-  map<string, string>::iterator proto_lookup =
+  std::map<string, string>::iterator proto_lookup =
       proto_file_to_framework_name_.find(file->name());
   if (proto_lookup != proto_file_to_framework_name_.end()) {
     other_framework_imports_.push_back(
@@ -1551,7 +1568,7 @@ void ImportWriter::Print(io::Printer* printer) const {
     printer->Print(
         "#if $cpp_symbol$\n",
         "cpp_symbol", cpp_symbol);
-    for (vector<string>::const_iterator iter = protobuf_framework_imports_.begin();
+    for (std::vector<string>::const_iterator iter = protobuf_framework_imports_.begin();
          iter != protobuf_framework_imports_.end(); ++iter) {
       printer->Print(
           " #import <$framework_name$/$header$>\n",
@@ -1560,7 +1577,7 @@ void ImportWriter::Print(io::Printer* printer) const {
     }
     printer->Print(
         "#else\n");
-    for (vector<string>::const_iterator iter = protobuf_non_framework_imports_.begin();
+    for (std::vector<string>::const_iterator iter = protobuf_non_framework_imports_.begin();
          iter != protobuf_non_framework_imports_.end(); ++iter) {
       printer->Print(
           " #import \"$header$\"\n",
@@ -1577,10 +1594,10 @@ void ImportWriter::Print(io::Printer* printer) const {
       printer->Print("\n");
     }
 
-    for (vector<string>::const_iterator iter = other_framework_imports_.begin();
+    for (std::vector<string>::const_iterator iter = other_framework_imports_.begin();
          iter != other_framework_imports_.end(); ++iter) {
       printer->Print(
-          " #import <$header$>\n",
+          "#import <$header$>\n",
           "header", *iter);
     }
 
@@ -1592,10 +1609,10 @@ void ImportWriter::Print(io::Printer* printer) const {
       printer->Print("\n");
     }
 
-    for (vector<string>::const_iterator iter = other_imports_.begin();
+    for (std::vector<string>::const_iterator iter = other_imports_.begin();
          iter != other_imports_.end(); ++iter) {
       printer->Print(
-          " #import \"$header$\"\n",
+          "#import \"$header$\"\n",
           "header", *iter);
     }
   }
@@ -1611,9 +1628,9 @@ void ImportWriter::ParseFrameworkMappings() {
   string parse_error;
   if (!ParseSimpleFile(named_framework_to_proto_path_mappings_path_,
                        &collector, &parse_error)) {
-    cerr << "error parsing " << named_framework_to_proto_path_mappings_path_
-         << " : " << parse_error << endl;
-    cerr.flush();
+    std::cerr << "error parsing " << named_framework_to_proto_path_mappings_path_
+         << " : " << parse_error << std::endl;
+    std::cerr.flush();
   }
 }
 
@@ -1640,19 +1657,19 @@ bool ImportWriter::ProtoFrameworkCollector::ConsumeLine(
     StringPiece proto_file(proto_file_list, start, offset - start);
     StringPieceTrimWhitespace(&proto_file);
     if (proto_file.size() != 0) {
-      map<string, string>::iterator existing_entry =
+      std::map<string, string>::iterator existing_entry =
           map_->find(proto_file.ToString());
       if (existing_entry != map_->end()) {
-        cerr << "warning: duplicate proto file reference, replacing framework entry for '"
+        std::cerr << "warning: duplicate proto file reference, replacing framework entry for '"
              << proto_file.ToString() << "' with '" << framework_name.ToString()
-             << "' (was '" << existing_entry->second << "')." << endl;
-        cerr.flush();
+             << "' (was '" << existing_entry->second << "')." << std::endl;
+        std::cerr.flush();
       }
 
       if (proto_file.find(' ') != StringPiece::npos) {
-        cerr << "note: framework mapping file had a proto file with a space in, hopefully that isn't a missing comma: '"
-             << proto_file.ToString() << "'" << endl;
-        cerr.flush();
+        std::cerr << "note: framework mapping file had a proto file with a space in, hopefully that isn't a missing comma: '"
+             << proto_file.ToString() << "'" << std::endl;
+        std::cerr.flush();
       }
 
       (*map_)[proto_file.ToString()] = framework_name.ToString();
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_helpers.h b/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
index c99262a1..8999aa59 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_helpers.h
@@ -190,7 +190,7 @@ string LIBPROTOC_EXPORT GPBGenericValueFieldName(const FieldDescriptor* field);
 string LIBPROTOC_EXPORT DefaultValue(const FieldDescriptor* field);
 bool LIBPROTOC_EXPORT HasNonZeroDefaultValue(const FieldDescriptor* field);
 
-string LIBPROTOC_EXPORT BuildFlagsString(const FlagType type, const vector<string>& strings);
+string LIBPROTOC_EXPORT BuildFlagsString(const FlagType type, const std::vector<string>& strings);
 
 // Builds HeaderDoc/appledoc style comments out of the comments in the .proto
 // file.
@@ -210,7 +210,7 @@ bool LIBPROTOC_EXPORT IsProtobufLibraryBundledProtoFile(const FileDescriptor* fi
 // Checks the prefix for the given files and outputs any warnings as needed. If
 // there are flat out errors, then out_error is filled in with the first error
 // and the result is false.
-bool LIBPROTOC_EXPORT ValidateObjCClassPrefixes(const vector<const FileDescriptor*>& files,
+bool LIBPROTOC_EXPORT ValidateObjCClassPrefixes(const std::vector<const FileDescriptor*>& files,
                                const Options& generation_options,
                                string* out_error);
 
@@ -233,7 +233,7 @@ class LIBPROTOC_EXPORT TextFormatDecodeData {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(TextFormatDecodeData);
 
   typedef std::pair<int32, string> DataEntry;
-  vector<DataEntry> entries_;
+  std::vector<DataEntry> entries_;
 };
 
 // Helper for parsing simple files.
@@ -253,7 +253,8 @@ bool LIBPROTOC_EXPORT ParseSimpleFile(
 class LIBPROTOC_EXPORT ImportWriter {
  public:
   ImportWriter(const string& generate_for_named_framework,
-               const string& named_framework_to_proto_path_mappings_path);
+               const string& named_framework_to_proto_path_mappings_path,
+               bool include_wkt_imports);
   ~ImportWriter();
 
   void AddFile(const FileDescriptor* file, const string& header_extension);
@@ -262,26 +263,27 @@ class LIBPROTOC_EXPORT ImportWriter {
  private:
   class ProtoFrameworkCollector : public LineConsumer {
    public:
-    ProtoFrameworkCollector(map<string, string>* inout_proto_file_to_framework_name)
+    ProtoFrameworkCollector(std::map<string, string>* inout_proto_file_to_framework_name)
         : map_(inout_proto_file_to_framework_name) {}
 
     virtual bool ConsumeLine(const StringPiece& line, string* out_error);
 
    private:
-    map<string, string>* map_;
+    std::map<string, string>* map_;
   };
 
   void ParseFrameworkMappings();
 
   const string generate_for_named_framework_;
   const string named_framework_to_proto_path_mappings_path_;
-  map<string, string> proto_file_to_framework_name_;
+  const bool include_wkt_imports_;
+  std::map<string, string> proto_file_to_framework_name_;
   bool need_to_parse_mapping_file_;
 
-  vector<string> protobuf_framework_imports_;
-  vector<string> protobuf_non_framework_imports_;
-  vector<string> other_framework_imports_;
-  vector<string> other_imports_;
+  std::vector<string> protobuf_framework_imports_;
+  std::vector<string> protobuf_non_framework_imports_;
+  std::vector<string> other_framework_imports_;
+  std::vector<string> other_imports_;
 };
 
 }  // namespace objectivec
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
index 0bc9dc10..bcaf5709 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_map_field.cc
@@ -162,7 +162,7 @@ void MapFieldGenerator::FinishInitialization(void) {
 }
 
 void MapFieldGenerator::DetermineForwardDeclarations(
-    set<string>* fwd_decls) const {
+    std::set<string>* fwd_decls) const {
   RepeatedFieldGenerator::DetermineForwardDeclarations(fwd_decls);
   const FieldDescriptor* value_descriptor =
       descriptor_->message_type()->FindFieldByName("value");
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_map_field.h b/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
index bc68a682..dc7beacf 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
@@ -51,10 +51,10 @@ class MapFieldGenerator : public RepeatedFieldGenerator {
   MapFieldGenerator(const FieldDescriptor* descriptor, const Options& options);
   virtual ~MapFieldGenerator();
 
-  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+  virtual void DetermineForwardDeclarations(std::set<string>* fwd_decls) const;
 
  private:
-  scoped_ptr<FieldGenerator> value_field_generator_;
+  std::unique_ptr<FieldGenerator> value_field_generator_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldGenerator);
 };
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_message.cc b/src/google/protobuf/compiler/objectivec/objectivec_message.cc
index e0bd3dac..83888854 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_message.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_message.cc
@@ -156,7 +156,7 @@ const FieldDescriptor** SortFieldsByNumber(const Descriptor* descriptor) {
   for (int i = 0; i < descriptor->field_count(); i++) {
     fields[i] = descriptor->field(i);
   }
-  sort(fields, fields + descriptor->field_count(), FieldOrderingByNumber());
+  std::sort(fields, fields + descriptor->field_count(), FieldOrderingByNumber());
   return fields;
 }
 
@@ -168,7 +168,7 @@ const FieldDescriptor** SortFieldsByStorageSize(const Descriptor* descriptor) {
   for (int i = 0; i < descriptor->field_count(); i++) {
     fields[i] = descriptor->field(i);
   }
-  sort(fields, fields + descriptor->field_count(),
+  std::sort(fields, fields + descriptor->field_count(),
        FieldOrderingByStorageSize());
   return fields;
 }
@@ -220,20 +220,20 @@ MessageGenerator::~MessageGenerator() {
 
 void MessageGenerator::GenerateStaticVariablesInitialization(
     io::Printer* printer) {
-  for (vector<ExtensionGenerator*>::iterator iter =
+  for (std::vector<ExtensionGenerator*>::iterator iter =
            extension_generators_.begin();
        iter != extension_generators_.end(); ++iter) {
     (*iter)->GenerateStaticVariablesInitialization(printer);
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->GenerateStaticVariablesInitialization(printer);
   }
 }
 
-void MessageGenerator::DetermineForwardDeclarations(set<string>* fwd_decls) {
+void MessageGenerator::DetermineForwardDeclarations(std::set<string>* fwd_decls) {
   if (!IsMapEntryMessage(descriptor_)) {
     for (int i = 0; i < descriptor_->field_count(); i++) {
       const FieldDescriptor* fieldDescriptor = descriptor_->field(i);
@@ -242,7 +242,7 @@ void MessageGenerator::DetermineForwardDeclarations(set<string>* fwd_decls) {
     }
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->DetermineForwardDeclarations(fwd_decls);
@@ -254,7 +254,7 @@ bool MessageGenerator::IncludesOneOfDefinition() const {
     return true;
   }
 
-  for (vector<MessageGenerator*>::const_iterator iter =
+  for (std::vector<MessageGenerator*>::const_iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     if ((*iter)->IncludesOneOfDefinition()) {
@@ -266,12 +266,12 @@ bool MessageGenerator::IncludesOneOfDefinition() const {
 }
 
 void MessageGenerator::GenerateEnumHeader(io::Printer* printer) {
-  for (vector<EnumGenerator*>::iterator iter = enum_generators_.begin();
+  for (std::vector<EnumGenerator*>::iterator iter = enum_generators_.begin();
        iter != enum_generators_.end(); ++iter) {
     (*iter)->GenerateHeader(printer);
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->GenerateEnumHeader(printer);
@@ -280,13 +280,13 @@ void MessageGenerator::GenerateEnumHeader(io::Printer* printer) {
 
 void MessageGenerator::GenerateExtensionRegistrationSource(
     io::Printer* printer) {
-  for (vector<ExtensionGenerator*>::iterator iter =
+  for (std::vector<ExtensionGenerator*>::iterator iter =
            extension_generators_.begin();
        iter != extension_generators_.end(); ++iter) {
     (*iter)->GenerateRegistrationSource(printer);
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->GenerateExtensionRegistrationSource(printer);
@@ -296,7 +296,7 @@ void MessageGenerator::GenerateExtensionRegistrationSource(
 void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
   // This a a map entry message, just recurse and do nothing directly.
   if (IsMapEntryMessage(descriptor_)) {
-    for (vector<MessageGenerator*>::iterator iter =
+    for (std::vector<MessageGenerator*>::iterator iter =
              nested_message_generators_.begin();
          iter != nested_message_generators_.end(); ++iter) {
       (*iter)->GenerateMessageHeader(printer);
@@ -310,7 +310,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
       "classname", class_name_);
 
   if (descriptor_->field_count()) {
-    scoped_array<const FieldDescriptor*> sorted_fields(
+    std::unique_ptr<const FieldDescriptor*[]> sorted_fields(
         SortFieldsByNumber(descriptor_));
 
     printer->Print("typedef GPB_ENUM($classname$_FieldNumber) {\n",
@@ -326,7 +326,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
     printer->Print("};\n\n");
   }
 
-  for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+  for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
        iter != oneof_generators_.end(); ++iter) {
     (*iter)->GenerateCaseEnum(printer);
   }
@@ -345,7 +345,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
       "deprecated_attribute", deprecated_attribute_,
       "comments", message_comments);
 
-  vector<char> seen_oneofs(descriptor_->oneof_decl_count(), 0);
+  std::vector<char> seen_oneofs(descriptor_->oneof_decl_count(), 0);
   for (int i = 0; i < descriptor_->field_count(); i++) {
     const FieldDescriptor* field = descriptor_->field(i);
     if (field->containing_oneof() != NULL) {
@@ -367,7 +367,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
   }
 
   if (!oneof_generators_.empty()) {
-    for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+    for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
          iter != oneof_generators_.end(); ++iter) {
       (*iter)->GenerateClearFunctionDeclaration(printer);
     }
@@ -377,7 +377,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
   if (descriptor_->extension_count() > 0) {
     printer->Print("@interface $classname$ (DynamicMethods)\n\n",
                    "classname", class_name_);
-    for (vector<ExtensionGenerator*>::iterator iter =
+    for (std::vector<ExtensionGenerator*>::iterator iter =
              extension_generators_.begin();
          iter != extension_generators_.end(); ++iter) {
       (*iter)->GenerateMembersHeader(printer);
@@ -385,7 +385,7 @@ void MessageGenerator::GenerateMessageHeader(io::Printer* printer) {
     printer->Print("@end\n\n");
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->GenerateMessageHeader(printer);
@@ -410,7 +410,7 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
     printer->Print("@implementation $classname$\n\n",
                    "classname", class_name_);
 
-    for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+    for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
          iter != oneof_generators_.end(); ++iter) {
       (*iter)->GeneratePropertyImplementation(printer);
     }
@@ -420,17 +420,17 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
           .GeneratePropertyImplementation(printer);
     }
 
-    scoped_array<const FieldDescriptor*> sorted_fields(
+    std::unique_ptr<const FieldDescriptor*[]> sorted_fields(
         SortFieldsByNumber(descriptor_));
-    scoped_array<const FieldDescriptor*> size_order_fields(
+    std::unique_ptr<const FieldDescriptor*[]> size_order_fields(
         SortFieldsByStorageSize(descriptor_));
 
-    vector<const Descriptor::ExtensionRange*> sorted_extensions;
+    std::vector<const Descriptor::ExtensionRange*> sorted_extensions;
     for (int i = 0; i < descriptor_->extension_range_count(); ++i) {
       sorted_extensions.push_back(descriptor_->extension_range(i));
     }
 
-    sort(sorted_extensions.begin(), sorted_extensions.end(),
+    std::sort(sorted_extensions.begin(), sorted_extensions.end(),
          ExtensionRangeOrdering());
 
     // Assign has bits:
@@ -448,7 +448,7 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
       sizeof_has_storage = 1;
     }
     // Tell all the fields the oneof base.
-    for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+    for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
          iter != oneof_generators_.end(); ++iter) {
       (*iter)->SetOneofIndexBase(sizeof_has_storage);
     }
@@ -514,7 +514,7 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
           "    };\n");
     }
 
-    map<string, string> vars;
+    std::map<string, string> vars;
     vars["classname"] = class_name_;
     vars["rootclassname"] = root_classname_;
     vars["fields"] = has_fields ? "fields" : "NULL";
@@ -548,7 +548,7 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
     if (oneof_generators_.size() != 0) {
       printer->Print(
           "    static const char *oneofs[] = {\n");
-      for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+      for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
            iter != oneof_generators_.end(); ++iter) {
         printer->Print(
             "      \"$name$\",\n",
@@ -623,18 +623,18 @@ void MessageGenerator::GenerateSource(io::Printer* printer) {
           .GenerateCFunctionImplementations(printer);
     }
 
-    for (vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
+    for (std::vector<OneofGenerator*>::iterator iter = oneof_generators_.begin();
          iter != oneof_generators_.end(); ++iter) {
       (*iter)->GenerateClearFunctionImplementation(printer);
     }
   }
 
-  for (vector<EnumGenerator*>::iterator iter = enum_generators_.begin();
+  for (std::vector<EnumGenerator*>::iterator iter = enum_generators_.begin();
        iter != enum_generators_.end(); ++iter) {
     (*iter)->GenerateSource(printer);
   }
 
-  for (vector<MessageGenerator*>::iterator iter =
+  for (std::vector<MessageGenerator*>::iterator iter =
            nested_message_generators_.begin();
        iter != nested_message_generators_.end(); ++iter) {
     (*iter)->GenerateSource(printer);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_message.h b/src/google/protobuf/compiler/objectivec/objectivec_message.h
index 0fb78bc0..2de03f12 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_message.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_message.h
@@ -64,7 +64,7 @@ class MessageGenerator {
   void GenerateMessageHeader(io::Printer* printer);
   void GenerateSource(io::Printer* printer);
   void GenerateExtensionRegistrationSource(io::Printer* printer);
-  void DetermineForwardDeclarations(set<string>* fwd_decls);
+  void DetermineForwardDeclarations(std::set<string>* fwd_decls);
 
   // Checks if the message or a nested message includes a oneof definition.
   bool IncludesOneOfDefinition() const;
@@ -86,10 +86,10 @@ class MessageGenerator {
   FieldGeneratorMap field_generators_;
   const string class_name_;
   const string deprecated_attribute_;
-  vector<ExtensionGenerator*> extension_generators_;
-  vector<EnumGenerator*> enum_generators_;
-  vector<MessageGenerator*> nested_message_generators_;
-  vector<OneofGenerator*> oneof_generators_;
+  std::vector<ExtensionGenerator*> extension_generators_;
+  std::vector<EnumGenerator*> enum_generators_;
+  std::vector<MessageGenerator*> nested_message_generators_;
+  std::vector<OneofGenerator*> oneof_generators_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageGenerator);
 };
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_message_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_message_field.cc
index d6ccd6d1..699d25b3 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_message_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_message_field.cc
@@ -45,7 +45,7 @@ namespace objectivec {
 namespace {
 
 void SetMessageVariables(const FieldDescriptor* descriptor,
-                         map<string, string>* variables) {
+                         std::map<string, string>* variables) {
   const string& message_type = ClassName(descriptor->message_type());
   (*variables)["type"] = message_type;
   (*variables)["containing_class"] = ClassName(descriptor->containing_type());
@@ -67,7 +67,7 @@ MessageFieldGenerator::MessageFieldGenerator(const FieldDescriptor* descriptor,
 MessageFieldGenerator::~MessageFieldGenerator() {}
 
 void MessageFieldGenerator::DetermineForwardDeclarations(
-    set<string>* fwd_decls) const {
+    std::set<string>* fwd_decls) const {
   ObjCObjFieldGenerator::DetermineForwardDeclarations(fwd_decls);
   // Class name is already in "storage_type".
   fwd_decls->insert("@class " + variable("storage_type"));
@@ -95,7 +95,7 @@ RepeatedMessageFieldGenerator::RepeatedMessageFieldGenerator(
 RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}
 
 void RepeatedMessageFieldGenerator::DetermineForwardDeclarations(
-    set<string>* fwd_decls) const {
+    std::set<string>* fwd_decls) const {
   RepeatedFieldGenerator::DetermineForwardDeclarations(fwd_decls);
   // Class name is already in "storage_type".
   fwd_decls->insert("@class " + variable("storage_type"));
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_message_field.h b/src/google/protobuf/compiler/objectivec/objectivec_message_field.h
index d2dba153..50f4b6d4 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_message_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_message_field.h
@@ -51,7 +51,7 @@ class MessageFieldGenerator : public ObjCObjFieldGenerator {
   virtual bool WantsHasProperty(void) const;
 
  public:
-  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+  virtual void DetermineForwardDeclarations(std::set<string>* fwd_decls) const;
 
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageFieldGenerator);
@@ -67,7 +67,7 @@ class RepeatedMessageFieldGenerator : public RepeatedFieldGenerator {
   virtual ~RepeatedMessageFieldGenerator();
 
  public:
-  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+  virtual void DetermineForwardDeclarations(std::set<string>* fwd_decls) const;
 
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedMessageFieldGenerator);
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_oneof.h b/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
index 3d9df4db..ff353a6c 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_oneof.h
@@ -67,7 +67,7 @@ class OneofGenerator {
 
  private:
   const OneofDescriptor* descriptor_;
-  map<string, string> variables_;
+  std::map<string, string> variables_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(OneofGenerator);
 };
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
index d49350f4..aa8ac324 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
+++ b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.cc
@@ -118,7 +118,7 @@ const char* PrimitiveArrayTypeName(const FieldDescriptor* descriptor) {
 }
 
 void SetPrimitiveVariables(const FieldDescriptor* descriptor,
-                           map<string, string>* variables) {
+                           std::map<string, string>* variables) {
   std::string primitive_name = PrimitiveTypeName(descriptor);
   (*variables)["type"] = primitive_name;
   (*variables)["storage_type"] = primitive_name;
diff --git a/src/google/protobuf/compiler/parser.cc b/src/google/protobuf/compiler/parser.cc
index 7a03d42b..5c7047a6 100644
--- a/src/google/protobuf/compiler/parser.cc
+++ b/src/google/protobuf/compiler/parser.cc
@@ -39,13 +39,14 @@
 #include <limits>
 
 
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
 #include <google/protobuf/compiler/parser.h>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/wire_format.h>
 #include <google/protobuf/io/tokenizer.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/wire_format.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/map_util.h>
 
@@ -336,31 +337,42 @@ void Parser::AddError(const string& error) {
 
 Parser::LocationRecorder::LocationRecorder(Parser* parser)
   : parser_(parser),
+    source_code_info_(parser->source_code_info_),
     location_(parser_->source_code_info_->add_location()) {
   location_->add_span(parser_->input_->current().line);
   location_->add_span(parser_->input_->current().column);
 }
 
 Parser::LocationRecorder::LocationRecorder(const LocationRecorder& parent) {
-  Init(parent);
+  Init(parent, parent.source_code_info_);
+}
+
+Parser::LocationRecorder::LocationRecorder(const LocationRecorder& parent,
+                                           int path1,
+                                           SourceCodeInfo* source_code_info) {
+  Init(parent, source_code_info);
+  AddPath(path1);
 }
 
 Parser::LocationRecorder::LocationRecorder(const LocationRecorder& parent,
                                            int path1) {
-  Init(parent);
+  Init(parent, parent.source_code_info_);
   AddPath(path1);
 }
 
 Parser::LocationRecorder::LocationRecorder(const LocationRecorder& parent,
                                            int path1, int path2) {
-  Init(parent);
+  Init(parent, parent.source_code_info_);
   AddPath(path1);
   AddPath(path2);
 }
 
-void Parser::LocationRecorder::Init(const LocationRecorder& parent) {
+void Parser::LocationRecorder::Init(const LocationRecorder& parent,
+                                    SourceCodeInfo* source_code_info) {
   parser_ = parent.parser_;
-  location_ = parser_->source_code_info_->add_location();
+  source_code_info_ = source_code_info;
+
+  location_ = source_code_info_->add_location();
   location_->mutable_path()->CopyFrom(parent.location_->path());
 
   location_->add_span(parser_->input_->current().line);
@@ -402,6 +414,10 @@ void Parser::LocationRecorder::RecordLegacyLocation(const Message* descriptor,
   }
 }
 
+int Parser::LocationRecorder::CurrentPathSize() const {
+  return location_->path_size();
+}
+
 void Parser::LocationRecorder::AttachComments(
     string* leading, string* trailing,
     std::vector<string>* detached_comments) const {
@@ -664,7 +680,7 @@ bool Parser::ParseMessageDefinition(
 
 namespace {
 
-const int kMaxExtensionRangeSentinel = -1;
+const int kMaxRangeSentinel = -1;
 
 bool IsMessageSetWireFormatMessage(const DescriptorProto& message) {
   const MessageOptions& options = message.options();
@@ -688,12 +704,27 @@ void AdjustExtensionRangesWithMaxEndNumber(DescriptorProto* message) {
       kint32max :
       FieldDescriptor::kMaxNumber + 1;
   for (int i = 0; i < message->extension_range_size(); ++i) {
-    if (message->extension_range(i).end() == kMaxExtensionRangeSentinel) {
+    if (message->extension_range(i).end() == kMaxRangeSentinel) {
       message->mutable_extension_range(i)->set_end(max_extension_number);
     }
   }
 }
 
+// Modifies any reserved ranges that specified 'max' as the end of the
+// reserved range, and sets them to the type-specific maximum. The actual max
+// tag number can only be determined after all options have been parsed.
+void AdjustReservedRangesWithMaxEndNumber(DescriptorProto* message) {
+  const bool is_message_set = IsMessageSetWireFormatMessage(*message);
+  const int max_field_number = is_message_set ?
+      kint32max :
+      FieldDescriptor::kMaxNumber + 1;
+  for (int i = 0; i < message->reserved_range_size(); ++i) {
+    if (message->reserved_range(i).end() == kMaxRangeSentinel) {
+      message->mutable_reserved_range(i)->set_end(max_field_number);
+    }
+  }
+}
+
 }  // namespace
 
 bool Parser::ParseMessageBlock(DescriptorProto* message,
@@ -717,6 +748,9 @@ bool Parser::ParseMessageBlock(DescriptorProto* message,
   if (message->extension_range_size() > 0) {
     AdjustExtensionRangesWithMaxEndNumber(message);
   }
+  if (message->reserved_range_size() > 0) {
+    AdjustReservedRangesWithMaxEndNumber(message);
+  }
   return true;
 }
 
@@ -1373,7 +1407,7 @@ bool Parser::ParseOption(Message* options,
           value_location.AddPath(
               UninterpretedOption::kNegativeIntValueFieldNumber);
           uninterpreted_option->set_negative_int_value(
-              -static_cast<int64>(value));
+              static_cast<int64>(-value));
         } else {
           value_location.AddPath(
               UninterpretedOption::kPositiveIntValueFieldNumber);
@@ -1429,6 +1463,8 @@ bool Parser::ParseExtensions(DescriptorProto* message,
   // Parse the declaration.
   DO(Consume("extensions"));
 
+  int old_range_size = message->extension_range_size();
+
   do {
     // Note that kExtensionRangeFieldNumber was already pushed by the parent.
     LocationRecorder location(extensions_location,
@@ -1455,7 +1491,7 @@ bool Parser::ParseExtensions(DescriptorProto* message,
         // Set to the sentinel value - 1 since we increment the value below.
         // The actual value of the end of the range should be set with
         // AdjustExtensionRangesWithMaxEndNumber.
-        end = kMaxExtensionRangeSentinel - 1;
+        end = kMaxRangeSentinel - 1;
       } else {
         DO(ConsumeInteger(&end, "Expected integer."));
       }
@@ -1475,12 +1511,58 @@ bool Parser::ParseExtensions(DescriptorProto* message,
     range->set_end(end);
   } while (TryConsume(","));
 
+
+  if (LookingAt("[")) {
+    int range_number_index = extensions_location.CurrentPathSize();
+    SourceCodeInfo info;
+
+    // Parse extension range options in the first range.
+    ExtensionRangeOptions* options =
+        message->mutable_extension_range(old_range_size)->mutable_options();
+
+    {
+      LocationRecorder index_location(
+          extensions_location, 0 /* we fill this in w/ actual index below */,
+          &info);
+      LocationRecorder location(
+          index_location,
+          DescriptorProto::ExtensionRange::kOptionsFieldNumber);
+      DO(Consume("["));
+
+      do {
+        DO(ParseOption(options, location, containing_file, OPTION_ASSIGNMENT));
+      } while (TryConsume(","));
+
+      DO(Consume("]"));
+    }
+
+    // Then copy the extension range options to all of the other ranges we've
+    // parsed.
+    for (int i = old_range_size + 1; i < message->extension_range_size(); i++) {
+      message->mutable_extension_range(i)->mutable_options()
+          ->CopyFrom(*options);
+    }
+    // and copy source locations to the other ranges, too
+    for (int i = old_range_size; i < message->extension_range_size(); i++) {
+      for (int j = 0; j < info.location_size(); j++) {
+        if (info.location(j).path_size() == range_number_index + 1) {
+          // this location's path is up to the extension range index, but doesn't
+          // include options; so it's redundant with location above
+          continue;
+        }
+        SourceCodeInfo_Location* dest = source_code_info_->add_location();
+        dest->CopyFrom(info.location(j));
+        dest->set_path(range_number_index, i);
+      }
+    }
+  }
+
   DO(ConsumeEndOfDeclaration(";", &extensions_location));
   return true;
 }
 
-// This is similar to extension range parsing, except that "max" is not
-// supported, and accepts field name literals.
+// This is similar to extension range parsing, except that it accepts field
+// name literals.
 bool Parser::ParseReserved(DescriptorProto* message,
                            const LocationRecorder& message_location) {
   // Parse the declaration.
@@ -1496,7 +1578,6 @@ bool Parser::ParseReserved(DescriptorProto* message,
   }
 }
 
-
 bool Parser::ParseReservedNames(DescriptorProto* message,
                                 const LocationRecorder& parent_location) {
   do {
@@ -1528,7 +1609,14 @@ bool Parser::ParseReservedNumbers(DescriptorProto* message,
     if (TryConsume("to")) {
       LocationRecorder end_location(
           location, DescriptorProto::ReservedRange::kEndFieldNumber);
-      DO(ConsumeInteger(&end, "Expected integer."));
+      if (TryConsume("max")) {
+        // Set to the sentinel value - 1 since we increment the value below.
+        // The actual value of the end of the range should be set with
+        // AdjustExtensionRangesWithMaxEndNumber.
+        end = kMaxRangeSentinel - 1;
+      } else {
+        DO(ConsumeInteger(&end, "Expected integer."));
+      }
     } else {
       LocationRecorder end_location(
           location, DescriptorProto::ReservedRange::kEndFieldNumber);
@@ -1550,6 +1638,77 @@ bool Parser::ParseReservedNumbers(DescriptorProto* message,
   return true;
 }
 
+bool Parser::ParseReserved(EnumDescriptorProto* message,
+                          const LocationRecorder& message_location) {
+  // Parse the declaration.
+  DO(Consume("reserved"));
+  if (LookingAtType(io::Tokenizer::TYPE_STRING)) {
+    LocationRecorder location(message_location,
+                              DescriptorProto::kReservedNameFieldNumber);
+    return ParseReservedNames(message, location);
+  } else {
+    LocationRecorder location(message_location,
+                              DescriptorProto::kReservedRangeFieldNumber);
+    return ParseReservedNumbers(message, location);
+  }
+}
+
+bool Parser::ParseReservedNames(EnumDescriptorProto* message,
+                                const LocationRecorder& parent_location) {
+  do {
+    LocationRecorder location(parent_location, message->reserved_name_size());
+    DO(ConsumeString(message->add_reserved_name(), "Expected enum value."));
+  } while (TryConsume(","));
+  DO(ConsumeEndOfDeclaration(";", &parent_location));
+  return true;
+}
+
+bool Parser::ParseReservedNumbers(EnumDescriptorProto* message,
+                                  const LocationRecorder& parent_location) {
+  bool first = true;
+  do {
+    LocationRecorder location(parent_location, message->reserved_range_size());
+
+    EnumDescriptorProto::EnumReservedRange* range =
+        message->add_reserved_range();
+    int start, end;
+    io::Tokenizer::Token start_token;
+    {
+      LocationRecorder start_location(
+          location, EnumDescriptorProto::EnumReservedRange::kStartFieldNumber);
+      start_token = input_->current();
+      DO(ConsumeSignedInteger(&start, (first ?
+                                 "Expected enum value or number range." :
+                                 "Expected enum number range.")));
+    }
+
+    if (TryConsume("to")) {
+      LocationRecorder end_location(
+          location, EnumDescriptorProto::EnumReservedRange::kEndFieldNumber);
+      if (TryConsume("max")) {
+        // This is in the enum descriptor path, which doesn't have the message
+        // set duality to fix up, so it doesn't integrate with the sentinel.
+        end = INT_MAX;
+      } else {
+        DO(ConsumeSignedInteger(&end, "Expected integer."));
+      }
+    } else {
+      LocationRecorder end_location(
+          location, EnumDescriptorProto::EnumReservedRange::kEndFieldNumber);
+      end_location.StartAt(start_token);
+      end_location.EndAt(start_token);
+      end = start;
+    }
+
+    range->set_start(start);
+    range->set_end(end);
+    first = false;
+  } while (TryConsume(","));
+
+  DO(ConsumeEndOfDeclaration(";", &parent_location));
+  return true;
+}
+
 bool Parser::ParseExtend(RepeatedPtrField<FieldDescriptorProto>* extensions,
                          RepeatedPtrField<DescriptorProto>* messages,
                          const LocationRecorder& parent_location,
@@ -1730,6 +1889,8 @@ bool Parser::ParseEnumStatement(EnumDescriptorProto* enum_type,
                               EnumDescriptorProto::kOptionsFieldNumber);
     return ParseOption(enum_type->mutable_options(), location,
                        containing_file, OPTION_STATEMENT);
+  } else if (LookingAt("reserved")) {
+    return ParseReserved(enum_type, enum_location);
   } else {
     LocationRecorder location(enum_location,
         EnumDescriptorProto::kValueFieldNumber, enum_type->value_size());
@@ -2116,4 +2277,5 @@ void SourceLocationTable::Clear() {
 
 }  // namespace compiler
 }  // namespace protobuf
+
 }  // namespace google
diff --git a/src/google/protobuf/compiler/parser.h b/src/google/protobuf/compiler/parser.h
index dd8b6586..5d98e5e1 100644
--- a/src/google/protobuf/compiler/parser.h
+++ b/src/google/protobuf/compiler/parser.h
@@ -40,10 +40,10 @@
 #include <map>
 #include <string>
 #include <utility>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/repeated_field.h>
 #include <google/protobuf/io/tokenizer.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/repeated_field.h>
 
 namespace google {
 namespace protobuf { class Message; }
@@ -224,6 +224,10 @@ class LIBPROTOBUF_EXPORT Parser {
     LocationRecorder(const LocationRecorder& parent, int path1);
     LocationRecorder(const LocationRecorder& parent, int path1, int path2);
 
+    // Creates a recorder that generates locations into given source code info.
+    LocationRecorder(const LocationRecorder& parent, int path1,
+                    SourceCodeInfo* source_code_info);
+
     ~LocationRecorder();
 
     // Add a path component.  See SourceCodeInfo.Location.path in
@@ -250,6 +254,9 @@ class LIBPROTOBUF_EXPORT Parser {
     void RecordLegacyLocation(const Message* descriptor,
         DescriptorPool::ErrorCollector::ErrorLocation location);
 
+    // Returns the number of path components in the recorder's current location.
+    int CurrentPathSize() const;
+
     // Attaches leading and trailing comments to the location.  The two strings
     // will be swapped into place, so after this is called *leading and
     // *trailing will be empty.
@@ -264,9 +271,10 @@ class LIBPROTOBUF_EXPORT Parser {
     // SourceCodeInfo.location repeated field. For top-level elements,
     // parent_index_ is -1.
     Parser* parser_;
+    SourceCodeInfo* source_code_info_;
     SourceCodeInfo::Location* location_;
 
-    void Init(const LocationRecorder& parent);
+    void Init(const LocationRecorder& parent, SourceCodeInfo* source_code_info);
   };
 
   // =================================================================
@@ -371,6 +379,12 @@ class LIBPROTOBUF_EXPORT Parser {
                           const LocationRecorder& parent_location);
   bool ParseReservedNumbers(DescriptorProto* message,
                             const LocationRecorder& parent_location);
+  bool ParseReserved(EnumDescriptorProto* message,
+                     const LocationRecorder& message_location);
+  bool ParseReservedNames(EnumDescriptorProto* message,
+                          const LocationRecorder& parent_location);
+  bool ParseReservedNumbers(EnumDescriptorProto* message,
+                            const LocationRecorder& parent_location);
 
   // Parse an "extend" declaration.  (See also comments for
   // ParseMessageField().)
diff --git a/src/google/protobuf/compiler/parser_unittest.cc b/src/google/protobuf/compiler/parser_unittest.cc
index 20140f8e..0725a682 100644
--- a/src/google/protobuf/compiler/parser_unittest.cc
+++ b/src/google/protobuf/compiler/parser_unittest.cc
@@ -33,24 +33,21 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 #include <algorithm>
 #include <map>
 
 #include <google/protobuf/compiler/parser.h>
 
+#include <google/protobuf/unittest.pb.h>
+#include <google/protobuf/unittest_custom_options.pb.h>
 #include <google/protobuf/io/tokenizer.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/wire_format.h>
 #include <google/protobuf/text_format.h>
-#include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/unittest_custom_options.pb.h>
-#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/wire_format.h>
 #include <google/protobuf/stubs/substitute.h>
+
 #include <google/protobuf/stubs/map_util.h>
 
 #include <google/protobuf/testing/googletest.h>
@@ -178,9 +175,9 @@ class ParserTest : public testing::Test {
   MockErrorCollector error_collector_;
   DescriptorPool pool_;
 
-  google::protobuf::scoped_ptr<io::ZeroCopyInputStream> raw_input_;
-  google::protobuf::scoped_ptr<io::Tokenizer> input_;
-  google::protobuf::scoped_ptr<Parser> parser_;
+  std::unique_ptr<io::ZeroCopyInputStream> raw_input_;
+  std::unique_ptr<io::Tokenizer> input_;
+  std::unique_ptr<Parser> parser_;
   bool require_syntax_identifier_;
 };
 
@@ -664,7 +661,7 @@ TEST_F(ParseMessageTest, ReservedRange) {
   ExpectParsesTo(
     "message TestMessage {\n"
     "  required int32 foo = 1;\n"
-    "  reserved 2, 15, 9 to 11, 3;\n"
+    "  reserved 2, 15, 9 to 11, 3, 20 to max;\n"
     "}\n",
 
     "message_type {"
@@ -674,6 +671,29 @@ TEST_F(ParseMessageTest, ReservedRange) {
     "  reserved_range { start:15  end:16        }"
     "  reserved_range { start:9   end:12        }"
     "  reserved_range { start:3   end:4         }"
+    "  reserved_range { start:20  end:536870912 }"
+    "}");
+}
+
+TEST_F(ParseMessageTest, ReservedRangeOnMessageSet) {
+  ExpectParsesTo(
+    "message TestMessage {\n"
+    "  option message_set_wire_format = true;\n"
+    "  reserved 20 to max;\n"
+    "}\n",
+
+    "message_type {"
+    "  name: \"TestMessage\""
+    "  options {"
+    "    uninterpreted_option {"
+    "      name {"
+    "        name_part: \"message_set_wire_format\""
+    "        is_extension: false"
+    "      }"
+    "      identifier_value: \"true\""
+    "    }"
+    "  }"
+    "  reserved_range { start:20  end:2147483647 }"
     "}");
 }
 
@@ -704,6 +724,30 @@ TEST_F(ParseMessageTest, ExtensionRange) {
     "}");
 }
 
+TEST_F(ParseMessageTest, ExtensionRangeWithOptions) {
+  ExpectParsesTo(
+    "message TestMessage {\n"
+    "  extensions 10 to 19 [(i) = 5];\n"
+    "}\n",
+
+    "message_type {"
+    "  name: \"TestMessage\""
+    "  extension_range {"
+    "    start:10"
+    "    end:20"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "}");
+}
+
 TEST_F(ParseMessageTest, CompoundExtensionRange) {
   ExpectParsesTo(
     "message TestMessage {\n"
@@ -720,6 +764,82 @@ TEST_F(ParseMessageTest, CompoundExtensionRange) {
     "}");
 }
 
+TEST_F(ParseMessageTest, CompoundExtensionRangeWithOptions) {
+  ExpectParsesTo(
+    "message TestMessage {\n"
+    "  extensions 2, 15, 9 to 11, 100 to max, 3 [(i) = 5];\n"
+    "}\n",
+
+    "message_type {"
+    "  name: \"TestMessage\""
+    "  extension_range {"
+    "    start:2"
+    "    end:3"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "  extension_range {"
+    "    start:15"
+    "    end:16"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "  extension_range {"
+    "    start:9"
+    "    end:12"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "  extension_range {"
+    "    start:100"
+    "    end:536870912"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "  extension_range {"
+    "    start:3"
+    "    end:4"
+    "    options {"
+    "      uninterpreted_option {"
+    "        name {"
+    "          name_part: \"i\""
+    "          is_extension: true"
+    "        }"
+    "        positive_int_value: 5"
+    "      }"
+    "    }"
+    "  }"
+    "}");
+}
+
 TEST_F(ParseMessageTest, LargerMaxForMessageSetWireFormatMessages) {
   // Messages using the message_set_wire_format option can accept larger
   // extension numbers, as the numbers are not encoded as int32 field values
@@ -872,6 +992,42 @@ TEST_F(ParseEnumTest, ValueOptions) {
     "}");
 }
 
+TEST_F(ParseEnumTest, ReservedRange) {
+  ExpectParsesTo(
+    "enum TestEnum {\n"
+    "  FOO = 0;\n"
+    "  reserved -2147483648, -6 to -4, -1 to 1, 2, 15, 9 to 11, 3, 20 to max;\n"
+    "}\n",
+
+    "enum_type {"
+    "  name: \"TestEnum\""
+    "  value { name:\"FOO\" number:0 }"
+    "  reserved_range { start:-2147483648  end:-2147483648 }"
+    "  reserved_range { start:-6           end:-4          }"
+    "  reserved_range { start:-1           end:1           }"
+    "  reserved_range { start:2            end:2           }"
+    "  reserved_range { start:15           end:15          }"
+    "  reserved_range { start:9            end:11          }"
+    "  reserved_range { start:3            end:3           }"
+    "  reserved_range { start:20           end:2147483647  }"
+    "}");
+}
+
+TEST_F(ParseEnumTest, ReservedNames) {
+  ExpectParsesTo(
+    "enum TestEnum {\n"
+    "  FOO = 0;\n"
+    "  reserved \"foo\", \"bar\";\n"
+    "}\n",
+
+    "enum_type {"
+    "  name: \"TestEnum\""
+    "  value { name:\"FOO\" number:0 }"
+    "  reserved_name: \"foo\""
+    "  reserved_name: \"bar\""
+    "}");
+}
+
 // ===================================================================
 
 typedef ParserTest ParseServiceTest;
@@ -1366,15 +1522,60 @@ TEST_F(ParseErrorTest, EnumValueMissingNumber) {
     "1:5: Missing numeric value for enum constant.\n");
 }
 
+TEST_F(ParseErrorTest, EnumReservedStandaloneMaxNotAllowed) {
+  ExpectHasErrors(
+    "enum TestEnum {\n"
+    "  FOO = 1;\n"
+    "  reserved max;\n"
+    "}\n",
+    "2:11: Expected enum value or number range.\n");
+}
+
+TEST_F(ParseErrorTest, EnumReservedMixNameAndNumber) {
+  ExpectHasErrors(
+    "enum TestEnum {\n"
+    "  FOO = 1;\n"
+    "  reserved 10, \"foo\";\n"
+    "}\n",
+    "2:15: Expected enum number range.\n");
+}
+
+TEST_F(ParseErrorTest, EnumReservedPositiveNumberOutOfRange) {
+  ExpectHasErrors(
+    "enum TestEnum {\n"
+       "FOO = 1;\n"
+    "  reserved 2147483648;\n"
+    "}\n",
+    "2:11: Integer out of range.\n");
+}
+
+TEST_F(ParseErrorTest, EnumReservedNegativeNumberOutOfRange) {
+  ExpectHasErrors(
+    "enum TestEnum {\n"
+       "FOO = 1;\n"
+    "  reserved -2147483649;\n"
+    "}\n",
+    "2:12: Integer out of range.\n");
+}
+
+TEST_F(ParseErrorTest, EnumReservedMissingQuotes) {
+  ExpectHasErrors(
+    "enum TestEnum {\n"
+    "  FOO = 1;\n"
+    "  reserved foo;\n"
+    "}\n",
+    "2:11: Expected enum value or number range.\n");
+}
+
 // -------------------------------------------------------------------
 // Reserved field number errors
 
-TEST_F(ParseErrorTest, ReservedMaxNotAllowed) {
+TEST_F(ParseErrorTest, ReservedStandaloneMaxNotAllowed) {
   ExpectHasErrors(
     "message Foo {\n"
-    "  reserved 10 to max;\n"
+    "  reserved max;\n"
     "}\n",
-    "1:17: Expected integer.\n");
+    "1:11: Expected field name or number range.\n");
 }
 
 TEST_F(ParseErrorTest, ReservedMixNameAndNumber) {
@@ -1393,6 +1594,23 @@ TEST_F(ParseErrorTest, ReservedMissingQuotes) {
     "1:11: Expected field name or number range.\n");
 }
 
+TEST_F(ParseErrorTest, ReservedNegativeNumber) {
+  ExpectHasErrors(
+    "message Foo {\n"
+    "  reserved -10;\n"
+    "}\n",
+    "1:11: Expected field name or number range.\n");
+}
+
+TEST_F(ParseErrorTest, ReservedNumberOutOfRange) {
+  ExpectHasErrors(
+    "message Foo {\n"
+    "  reserved 2147483648;\n"
+    "}\n",
+    "1:11: Integer out of range.\n");
+}
+
+
 // -------------------------------------------------------------------
 // Service errors
 
diff --git a/src/google/protobuf/compiler/php/php_generator.cc b/src/google/protobuf/compiler/php/php_generator.cc
index ec9a2365..a58e1754 100644
--- a/src/google/protobuf/compiler/php/php_generator.cc
+++ b/src/google/protobuf/compiler/php/php_generator.cc
@@ -40,8 +40,6 @@
 
 #include <sstream>
 
-using google::protobuf::internal::scoped_ptr;
-
 const std::string kDescriptorFile = "google/protobuf/descriptor.proto";
 const std::string kEmptyFile = "google/protobuf/empty.proto";
 const std::string kEmptyMetadataFile = "GPBMetadata/Google/Protobuf/GPBEmpty.php";
@@ -49,6 +47,31 @@ const std::string kDescriptorMetadataFile =
     "GPBMetadata/Google/Protobuf/Internal/Descriptor.php";
 const std::string kDescriptorDirName = "Google/Protobuf/Internal";
 const std::string kDescriptorPackageName = "Google\\Protobuf\\Internal";
+const char* const kReservedNames[] = {
+    "abstract",   "and",        "array",        "as",           "break",
+    "callable",   "case",       "catch",        "class",        "clone",
+    "const",      "continue",   "declare",      "default",      "die",
+    "do",         "echo",       "else",         "elseif",       "empty",
+    "enddeclare", "endfor",     "endforeach",   "endif",        "endswitch",
+    "endwhile",   "eval",       "exit",         "extends",      "final",
+    "for",        "foreach",    "function",     "global",       "goto",
+    "if",         "implements", "include",      "include_once", "instanceof",
+    "insteadof",  "interface",  "isset",        "list",         "namespace",
+    "new",        "or",         "print",        "private",      "protected",
+    "public",     "require",    "require_once", "return",       "static",
+    "switch",     "throw",      "trait",        "try",          "unset",
+    "use",        "var",        "while",        "xor",          "int",
+    "float",      "bool",       "string",       "true",         "false",
+    "null",       "void",       "iterable"};
+const char* const kValidConstantNames[] = {
+    "int",   "float", "bool", "string",   "true",
+    "false", "null",  "void", "iterable",
+};
+const int kReservedNamesSize = 73;
+const int kValidConstantNamesSize = 9;
+const int kFieldSetter = 1;
+const int kFieldGetter = 2;
+const int kFieldProperty = 3;
 
 namespace google {
 namespace protobuf {
@@ -60,7 +83,7 @@ std::string PhpName(const std::string& full_name, bool is_descriptor);
 std::string DefaultForField(FieldDescriptor* field);
 std::string IntToString(int32 value);
 std::string FilenameToClassname(const string& filename);
-std::string GeneratedMetadataFileName(const std::string& proto_file,
+std::string GeneratedMetadataFileName(const FileDescriptor* file,
                                       bool is_descriptor);
 std::string LabelForField(FieldDescriptor* field);
 std::string TypeName(FieldDescriptor* field);
@@ -69,77 +92,184 @@ std::string EscapeDollor(const string& to_escape);
 std::string BinaryToHex(const string& binary);
 void Indent(io::Printer* printer);
 void Outdent(io::Printer* printer);
-void GenerateMessageDocComment(io::Printer* printer, const Descriptor* message);
-void GenerateFieldDocComment(io::Printer* printer,
-                             const FieldDescriptor* field);
-void GenerateEnumDocComment(io::Printer* printer, const EnumDescriptor* enum_);
+void GenerateMessageDocComment(io::Printer* printer, const Descriptor* message,
+                               int is_descriptor);
+void GenerateMessageConstructorDocComment(io::Printer* printer,
+                                          const Descriptor* message,
+                                          int is_descriptor);
+void GenerateFieldDocComment(io::Printer* printer, const FieldDescriptor* field,
+                             int is_descriptor, int function_type);
+void GenerateEnumDocComment(io::Printer* printer, const EnumDescriptor* enum_,
+                            int is_descriptor);
 void GenerateEnumValueDocComment(io::Printer* printer,
                                  const EnumValueDescriptor* value);
+void GenerateServiceDocComment(io::Printer* printer,
+                               const ServiceDescriptor* service);
+void GenerateServiceMethodDocComment(io::Printer* printer,
+                              const MethodDescriptor* method);
 
-std::string RenameEmpty(const std::string& name) {
-  if (name == "Empty") {
-    return "GPBEmpty";
-  } else {
-    return name;
-  }
-}
 
-std::string MessagePrefix(const Descriptor* message) {
-  // Empty cannot be php class name.
-  if (message->name() == "Empty" &&
-      message->file()->package() == "google.protobuf") {
-    return "GPB";
-  } else {
-    return "";
+std::string ReservedNamePrefix(const string& classname,
+                                const FileDescriptor* file) {
+  bool is_reserved = false;
+
+  string lower = classname;
+  transform(lower.begin(), lower.end(), lower.begin(), ::tolower);
+
+  for (int i = 0; i < kReservedNamesSize; i++) {
+    if (lower == kReservedNames[i]) {
+      is_reserved = true;
+      break;
+    }
   }
-}
 
-std::string MessageName(const Descriptor* message, bool is_descriptor) {
-  string message_name = message->name();
-  const Descriptor* descriptor = message->containing_type();
-  while (descriptor != NULL) {
-    message_name = descriptor->name() + '_' + message_name;
-    descriptor = descriptor->containing_type();
+  if (is_reserved) {
+    if (file->package() == "google.protobuf") {
+      return "GPB";
+    } else {
+      return "PB";
+    }
   }
-  message_name = MessagePrefix(message) + message_name;
 
-  return PhpName(message->file()->package(), is_descriptor) + '\\' +
-         message_name;
+  return "";
 }
 
-std::string MessageFullName(const Descriptor* message, bool is_descriptor) {
+template <typename DescriptorType>
+std::string DescriptorFullName(const DescriptorType* desc, bool is_descriptor) {
   if (is_descriptor) {
-    return StringReplace(message->full_name(),
+    return StringReplace(desc->full_name(),
                          "google.protobuf",
                          "google.protobuf.internal", false);
   } else {
-    return message->full_name();
+    return desc->full_name();
   }
 }
 
-std::string EnumFullName(const EnumDescriptor* envm, bool is_descriptor) {
-  if (is_descriptor) {
-    return StringReplace(envm->full_name(),
-                         "google.protobuf",
-                         "google.protobuf.internal", false);
-  } else {
-    return envm->full_name();
+template <typename DescriptorType>
+std::string ClassNamePrefix(const string& classname,
+                            const DescriptorType* desc) {
+  const string& prefix = (desc->file()->options()).php_class_prefix();
+  if (prefix != "") {
+    return prefix;
   }
+
+  return ReservedNamePrefix(classname, desc->file());
 }
 
-std::string EnumClassName(const EnumDescriptor* envm) {
-  string enum_class_name = envm->name();
-  const Descriptor* descriptor = envm->containing_type();
-  while (descriptor != NULL) {
-    enum_class_name = descriptor->name() + '_' + enum_class_name;
-    descriptor = descriptor->containing_type();
+template <typename DescriptorType>
+std::string GeneratedClassNameImpl(const DescriptorType* desc) {
+  std::string classname = ClassNamePrefix(desc->name(), desc) + desc->name();
+  const Descriptor* containing = desc->containing_type();
+  while (containing != NULL) {
+    classname = ClassNamePrefix(containing->name(), desc) + containing->name()
+       + '\\' + classname;
+    containing = containing->containing_type();
   }
-  return enum_class_name;
+  return classname;
+}
+
+std::string GeneratedClassNameImpl(const ServiceDescriptor* desc) {
+  std::string classname = desc->name();
+  return ClassNamePrefix(classname, desc) + classname;
+}
+
+std::string GeneratedClassName(const Descriptor* desc) {
+  return GeneratedClassNameImpl(desc);
+}
+
+std::string GeneratedClassName(const EnumDescriptor* desc) {
+  return GeneratedClassNameImpl(desc);
 }
 
-std::string EnumName(const EnumDescriptor* envm, bool is_descriptor) {
-  string enum_name = EnumClassName(envm);
-  return PhpName(envm->file()->package(), is_descriptor) + '\\' + enum_name;
+std::string GeneratedClassName(const ServiceDescriptor* desc) {
+  return GeneratedClassNameImpl(desc);
+}
+
+template <typename DescriptorType>
+std::string LegacyGeneratedClassName(const DescriptorType* desc) {
+  std::string classname = desc->name();
+  const Descriptor* containing = desc->containing_type();
+  while (containing != NULL) {
+    classname = containing->name() + '_' + classname;
+    containing = containing->containing_type();
+  }
+  return ClassNamePrefix(classname, desc) + classname;
+}
+
+std::string ClassNamePrefix(const string& classname) {
+  string lower = classname;
+  transform(lower.begin(), lower.end(), lower.begin(), ::tolower);
+
+  for (int i = 0; i < kReservedNamesSize; i++) {
+    if (lower == kReservedNames[i]) {
+      return "PB";
+    }
+  }
+
+  return "";
+}
+
+std::string ConstantNamePrefix(const string& classname) {
+  bool is_reserved = false;
+
+  string lower = classname;
+  transform(lower.begin(), lower.end(), lower.begin(), ::tolower);
+
+  for (int i = 0; i < kReservedNamesSize; i++) {
+    if (lower == kReservedNames[i]) {
+      is_reserved = true;
+      break;
+    }
+  }
+
+  for (int i = 0; i < kValidConstantNamesSize; i++) {
+    if (lower == kValidConstantNames[i]) {
+      is_reserved = false;
+      break;
+    }
+  }
+
+  if (is_reserved) {
+    return "PB";
+  }
+
+  return "";
+}
+
+template <typename DescriptorType>
+std::string RootPhpNamespace(const DescriptorType* desc, bool is_descriptor) {
+  if (desc->file()->options().has_php_namespace()) {
+    const string& php_namespace = desc->file()->options().php_namespace();
+    if (php_namespace != "") {
+      return php_namespace;
+    }
+    return "";
+  }
+
+  if (desc->file()->package() != "") {
+    return PhpName(desc->file()->package(), is_descriptor);
+  }
+  return "";
+}
+
+template <typename DescriptorType>
+std::string FullClassName(const DescriptorType* desc, bool is_descriptor) {
+  string classname = GeneratedClassNameImpl(desc);
+  string php_namespace = RootPhpNamespace(desc, is_descriptor);
+  if (php_namespace != "") {
+    return php_namespace + "\\" + classname;
+  }
+  return classname;
+}
+
+template <typename DescriptorType>
+std::string LegacyFullClassName(const DescriptorType* desc, bool is_descriptor) {
+  string classname = LegacyGeneratedClassName(desc);
+  string php_namespace = RootPhpNamespace(desc, is_descriptor);
+  if (php_namespace != "") {
+    return php_namespace + "\\" + classname;
+  }
+  return classname;
 }
 
 std::string PhpName(const std::string& full_name, bool is_descriptor) {
@@ -147,20 +277,23 @@ std::string PhpName(const std::string& full_name, bool is_descriptor) {
     return kDescriptorPackageName;
   }
 
+  std::string segment;
   std::string result;
   bool cap_next_letter = true;
   for (int i = 0; i < full_name.size(); i++) {
     if ('a' <= full_name[i] && full_name[i] <= 'z' && cap_next_letter) {
-      result += full_name[i] + ('A' - 'a');
+      segment += full_name[i] + ('A' - 'a');
       cap_next_letter = false;
     } else if (full_name[i] == '.') {
-      result += '\\';
+      result += ClassNamePrefix(segment) + segment + '\\';
+      segment = "";
       cap_next_letter = true;
     } else {
-      result += full_name[i];
+      segment += full_name[i];
       cap_next_letter = false;
     }
   }
+  result += ClassNamePrefix(segment) + segment;
   return result;
 }
 
@@ -188,11 +321,13 @@ std::string DefaultForField(const FieldDescriptor* field) {
   }
 }
 
-std::string GeneratedMetadataFileName(const std::string& proto_file,
+std::string GeneratedMetadataFileName(const FileDescriptor* file,
                                       bool is_descriptor) {
+  const string& proto_file = file->name();
   int start_index = 0;
   int first_index = proto_file.find_first_of("/", start_index);
-  std::string result = "GPBMetadata/";
+  std::string result = "";
+  std::string segment = "";
 
   if (proto_file == kEmptyFile) {
     return kEmptyMetadataFile;
@@ -210,24 +345,57 @@ std::string GeneratedMetadataFileName(const std::string& proto_file,
     file_no_suffix = proto_file.substr(0, lastindex);
   }
 
-  while (first_index != string::npos) {
-    result += UnderscoresToCamelCase(
-        file_no_suffix.substr(start_index, first_index - start_index), true);
-    result += "/";
-    start_index = first_index + 1;
-    first_index = file_no_suffix.find_first_of("/", start_index);
+  if (file->options().has_php_metadata_namespace()) {
+    const string& php_metadata_namespace =
+        file->options().php_metadata_namespace();
+    if (php_metadata_namespace != "" && php_metadata_namespace != "\\") {
+      result += php_metadata_namespace;
+      std::replace(result.begin(), result.end(), '\\', '/');
+      if (result.at(result.size() - 1) != '/') {
+        result += "/";
+      }
+    }
+  } else {
+    result += "GPBMetadata/";
+    while (first_index != string::npos) {
+      segment = UnderscoresToCamelCase(
+          file_no_suffix.substr(start_index, first_index - start_index), true);
+      result += ReservedNamePrefix(segment, file) + segment + "/";
+      start_index = first_index + 1;
+      first_index = file_no_suffix.find_first_of("/", start_index);
+    }
   }
 
   // Append file name.
-  result += RenameEmpty(UnderscoresToCamelCase(
-      file_no_suffix.substr(start_index, first_index - start_index), true));
+  int file_name_start = file_no_suffix.find_last_of("/");
+  if (file_name_start == string::npos) {
+    file_name_start = 0;
+  } else {
+    file_name_start += 1;
+  }
+  segment = UnderscoresToCamelCase(
+      file_no_suffix.substr(file_name_start, first_index - file_name_start), true);
+
+  return result + ReservedNamePrefix(segment, file) + segment + ".php";
+}
 
-  return result += ".php";
+template <typename DescriptorType>
+std::string GeneratedClassFileName(const DescriptorType* desc,
+                                     bool is_descriptor) {
+  std::string result = FullClassName(desc, is_descriptor);
+  for (int i = 0; i < result.size(); i++) {
+    if (result[i] == '\\') {
+      result[i] = '/';
+    }
+  }
+  return result + ".php";
 }
 
-std::string GeneratedMessageFileName(const Descriptor* message,
+template <typename DescriptorType>
+std::string LegacyGeneratedClassFileName(const DescriptorType* desc,
                                      bool is_descriptor) {
-  std::string result = MessageName(message, is_descriptor);
+  std::string result = LegacyFullClassName(desc, is_descriptor);
+
   for (int i = 0; i < result.size(); i++) {
     if (result[i] == '\\') {
       result[i] = '/';
@@ -236,9 +404,9 @@ std::string GeneratedMessageFileName(const Descriptor* message,
   return result + ".php";
 }
 
-std::string GeneratedEnumFileName(const EnumDescriptor* en,
-                                  bool is_descriptor) {
-  std::string result = EnumName(en, is_descriptor);
+std::string GeneratedServiceFileName(const ServiceDescriptor* service,
+                                    bool is_descriptor) {
+  std::string result = FullClassName(service, is_descriptor) + "Interface";
   for (int i = 0; i < result.size(); i++) {
     if (result[i] == '\\') {
       result[i] = '/';
@@ -286,13 +454,94 @@ std::string TypeName(const FieldDescriptor* field) {
   }
 }
 
+std::string PhpSetterTypeName(const FieldDescriptor* field, bool is_descriptor) {
+  if (field->is_map()) {
+    return "array|\\Google\\Protobuf\\Internal\\MapField";
+  }
+  string type;
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_INT32:
+    case FieldDescriptor::TYPE_UINT32:
+    case FieldDescriptor::TYPE_SINT32:
+    case FieldDescriptor::TYPE_FIXED32:
+    case FieldDescriptor::TYPE_SFIXED32:
+    case FieldDescriptor::TYPE_ENUM:
+      type = "int";
+      break;
+    case FieldDescriptor::TYPE_INT64:
+    case FieldDescriptor::TYPE_UINT64:
+    case FieldDescriptor::TYPE_SINT64:
+    case FieldDescriptor::TYPE_FIXED64:
+    case FieldDescriptor::TYPE_SFIXED64:
+      type = "int|string";
+      break;
+    case FieldDescriptor::TYPE_DOUBLE:
+    case FieldDescriptor::TYPE_FLOAT:
+      type = "float";
+      break;
+    case FieldDescriptor::TYPE_BOOL:
+      type = "bool";
+      break;
+    case FieldDescriptor::TYPE_STRING:
+    case FieldDescriptor::TYPE_BYTES:
+      type = "string";
+      break;
+    case FieldDescriptor::TYPE_MESSAGE:
+      type = "\\" + FullClassName(field->message_type(), is_descriptor);
+      break;
+    case FieldDescriptor::TYPE_GROUP:
+      return "null";
+    default: assert(false); return "";
+  }
+  if (field->is_repeated()) {
+    // accommodate for edge case with multiple types.
+    size_t start_pos = type.find("|");
+    if (start_pos != std::string::npos) {
+      type.replace(start_pos, 1, "[]|");
+    }
+    type += "[]|\\Google\\Protobuf\\Internal\\RepeatedField";
+  }
+  return type;
+}
+
+std::string PhpGetterTypeName(const FieldDescriptor* field, bool is_descriptor) {
+  if (field->is_map()) {
+    return "\\Google\\Protobuf\\Internal\\MapField";
+  }
+  if (field->is_repeated()) {
+    return "\\Google\\Protobuf\\Internal\\RepeatedField";
+  }
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_INT32:
+    case FieldDescriptor::TYPE_UINT32:
+    case FieldDescriptor::TYPE_SINT32:
+    case FieldDescriptor::TYPE_FIXED32:
+    case FieldDescriptor::TYPE_SFIXED32:
+    case FieldDescriptor::TYPE_ENUM: return "int";
+    case FieldDescriptor::TYPE_INT64:
+    case FieldDescriptor::TYPE_UINT64:
+    case FieldDescriptor::TYPE_SINT64:
+    case FieldDescriptor::TYPE_FIXED64:
+    case FieldDescriptor::TYPE_SFIXED64: return "int|string";
+    case FieldDescriptor::TYPE_DOUBLE:
+    case FieldDescriptor::TYPE_FLOAT: return "float";
+    case FieldDescriptor::TYPE_BOOL: return "bool";
+    case FieldDescriptor::TYPE_STRING:
+    case FieldDescriptor::TYPE_BYTES: return "string";
+    case FieldDescriptor::TYPE_MESSAGE:
+      return "\\" + FullClassName(field->message_type(), is_descriptor);
+    case FieldDescriptor::TYPE_GROUP: return "null";
+    default: assert(false); return "";
+  }
+}
+
 std::string EnumOrMessageSuffix(
     const FieldDescriptor* field, bool is_descriptor) {
   if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
-    return ", '" + MessageFullName(field->message_type(), is_descriptor) + "'";
+    return ", '" + DescriptorFullName(field->message_type(), is_descriptor) + "'";
   }
   if (field->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
-    return ", '" + EnumFullName(field->enum_type(), is_descriptor) + "'";
+    return ", '" + DescriptorFullName(field->enum_type(), is_descriptor) + "'";
   }
   return "";
 }
@@ -370,7 +619,7 @@ void Outdent(io::Printer* printer) {
 void GenerateField(const FieldDescriptor* field, io::Printer* printer,
                    bool is_descriptor) {
   if (field->is_repeated()) {
-    GenerateFieldDocComment(printer, field);
+    GenerateFieldDocComment(printer, field, is_descriptor, kFieldProperty);
     printer->Print(
         "private $^name^;\n",
         "name", field->name());
@@ -378,7 +627,7 @@ void GenerateField(const FieldDescriptor* field, io::Printer* printer,
     // Oneof fields are handled by GenerateOneofField.
     return;
   } else {
-    GenerateFieldDocComment(printer, field);
+    GenerateFieldDocComment(printer, field, is_descriptor, kFieldProperty);
     printer->Print(
         "private $^name^ = ^default^;\n",
         "name", field->name(),
@@ -406,7 +655,7 @@ void GenerateFieldAccessor(const FieldDescriptor* field, bool is_descriptor,
 
   // Generate getter.
   if (oneof != NULL) {
-    GenerateFieldDocComment(printer, field);
+    GenerateFieldDocComment(printer, field, is_descriptor, kFieldGetter);
     printer->Print(
         "public function get^camel_name^()\n"
         "{\n"
@@ -415,7 +664,7 @@ void GenerateFieldAccessor(const FieldDescriptor* field, bool is_descriptor,
         "camel_name", UnderscoresToCamelCase(field->name(), true),
         "number", IntToString(field->number()));
   } else {
-    GenerateFieldDocComment(printer, field);
+    GenerateFieldDocComment(printer, field, is_descriptor, kFieldGetter);
     printer->Print(
         "public function get^camel_name^()\n"
         "{\n"
@@ -426,45 +675,64 @@ void GenerateFieldAccessor(const FieldDescriptor* field, bool is_descriptor,
   }
 
   // Generate setter.
-  GenerateFieldDocComment(printer, field);
+  GenerateFieldDocComment(printer, field, is_descriptor, kFieldSetter);
   printer->Print(
-      "public function set^camel_name^(^var^)\n"
+      "public function set^camel_name^($var)\n"
       "{\n",
-      "camel_name", UnderscoresToCamelCase(field->name(), true),
-      "var", (field->is_repeated() ||
-              field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) ?
-             "&$var": "$var");
+      "camel_name", UnderscoresToCamelCase(field->name(), true));
 
   Indent(printer);
 
   // Type check.
   if (field->is_map()) {
+    const Descriptor* map_entry = field->message_type();
+    const FieldDescriptor* key = map_entry->FindFieldByName("key");
+    const FieldDescriptor* value = map_entry->FindFieldByName("value");
+    printer->Print(
+        "$arr = GPBUtil::checkMapField($var, "
+        "\\Google\\Protobuf\\Internal\\GPBType::^key_type^, "
+        "\\Google\\Protobuf\\Internal\\GPBType::^value_type^",
+        "key_type", ToUpper(key->type_name()),
+        "value_type", ToUpper(value->type_name()));
+    if (value->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+      printer->Print(
+          ", \\^class_name^);\n",
+          "class_name",
+          FullClassName(value->message_type(), is_descriptor) + "::class");
+    } else if (value->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
+      printer->Print(
+          ", \\^class_name^);\n",
+          "class_name",
+          FullClassName(value->enum_type(), is_descriptor) + "::class");
+    } else {
+      printer->Print(");\n");
+    }
   } else if (field->is_repeated()) {
     printer->Print(
-        "GPBUtil::checkRepeatedField($var, "
+        "$arr = GPBUtil::checkRepeatedField($var, "
         "\\Google\\Protobuf\\Internal\\GPBType::^type^",
         "type", ToUpper(field->type_name()));
     if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
       printer->Print(
           ", \\^class_name^);\n",
           "class_name",
-          MessageName(field->message_type(), is_descriptor) + "::class");
+          FullClassName(field->message_type(), is_descriptor) + "::class");
     } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
       printer->Print(
-          ", ^class_name^);\n",
+          ", \\^class_name^);\n",
           "class_name",
-          EnumName(field->enum_type(), is_descriptor) + "::class");
+          FullClassName(field->enum_type(), is_descriptor) + "::class");
     } else {
       printer->Print(");\n");
     }
   } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
     printer->Print(
         "GPBUtil::checkMessage($var, \\^class_name^::class);\n",
-        "class_name", MessageName(field->message_type(), is_descriptor));
+        "class_name", LegacyFullClassName(field->message_type(), is_descriptor));
   } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
     printer->Print(
         "GPBUtil::checkEnum($var, \\^class_name^::class);\n",
-        "class_name", EnumName(field->enum_type(), is_descriptor));
+        "class_name", LegacyFullClassName(field->enum_type(), is_descriptor));
   } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
     printer->Print(
         "GPBUtil::checkString($var, ^utf8^);\n",
@@ -480,6 +748,10 @@ void GenerateFieldAccessor(const FieldDescriptor* field, bool is_descriptor,
     printer->Print(
         "$this->writeOneof(^number^, $var);\n",
         "number", IntToString(field->number()));
+  } else if (field->is_repeated()) {
+    printer->Print(
+        "$this->^name^ = $arr;\n",
+        "name", field->name());
   } else {
     printer->Print(
         "$this->^name^ = $var;\n",
@@ -493,6 +765,8 @@ void GenerateFieldAccessor(const FieldDescriptor* field, bool is_descriptor,
         "field_name", field->name());
   }
 
+  printer->Print("\nreturn $this;\n");
+
   Outdent(printer);
 
   printer->Print(
@@ -514,7 +788,7 @@ void GenerateEnumToPool(const EnumDescriptor* en, io::Printer* printer) {
   printer->Print(
       "$pool->addEnum('^name^', "
       "\\Google\\Protobuf\\Internal\\^class_name^::class)\n",
-      "name", EnumFullName(en, true),
+      "name", DescriptorFullName(en, true),
       "class_name", en->name());
   Indent(printer);
 
@@ -522,13 +796,23 @@ void GenerateEnumToPool(const EnumDescriptor* en, io::Printer* printer) {
     const EnumValueDescriptor* value = en->value(i);
     printer->Print(
         "->value(\"^name^\", ^number^)\n",
-        "name", value->name(),
+        "name", ConstantNamePrefix(value->name()) + value->name(),
         "number", IntToString(value->number()));
   }
   printer->Print("->finalizeToPool();\n\n");
   Outdent(printer);
 }
 
+void GenerateServiceMethod(const MethodDescriptor* method,
+                           io::Printer* printer) {
+  printer->Print(
+        "public function ^camel_name^(\\^request_name^ $request);\n\n",
+        "camel_name", UnderscoresToCamelCase(method->name(), false),
+        "request_name", FullClassName(
+          method->input_type(), false)
+  );
+}
+
 void GenerateMessageToPool(const string& name_prefix, const Descriptor* message,
                            io::Printer* printer) {
   // Don't generate MapEntry messages -- we use the PHP extension's native
@@ -536,13 +820,13 @@ void GenerateMessageToPool(const string& name_prefix, const Descriptor* message,
   if (message->options().map_entry()) {
     return;
   }
-  string class_name = name_prefix.empty()?
-      message->name() : name_prefix + "_" + message->name();
+  string class_name = (name_prefix.empty() ? "" : name_prefix + "\\") +
+    ReservedNamePrefix(message->name(), message->file()) + message->name();
 
   printer->Print(
       "$pool->addMessage('^message^', "
       "\\Google\\Protobuf\\Internal\\^class_name^::class)\n",
-      "message", MessageFullName(message, true),
+      "message", DescriptorFullName(message, true),
       "class_name", class_name);
 
   Indent(printer);
@@ -637,8 +921,14 @@ void GenerateAddFileToPool(const FileDescriptor* file, bool is_descriptor,
   } else {
     for (int i = 0; i < file->dependency_count(); i++) {
       const std::string& name = file->dependency(i)->name();
+      // Currently, descriptor.proto is not ready for external usage. Skip to
+      // import it for now, so that its dependencies can still work as long as
+      // they don't use protos defined in descriptor.proto.
+      if (name == kDescriptorFile) {
+        continue;
+      }
       std::string dependency_filename =
-          GeneratedMetadataFileName(name, is_descriptor);
+          GeneratedMetadataFileName(file->dependency(i), is_descriptor);
       printer->Print(
           "\\^name^::initOnce();\n",
           "name", FilenameToClassname(dependency_filename));
@@ -648,6 +938,26 @@ void GenerateAddFileToPool(const FileDescriptor* file, bool is_descriptor,
     FileDescriptorSet files;
     FileDescriptorProto* file_proto = files.add_file();
     file->CopyTo(file_proto);
+
+    // Filter out descriptor.proto as it cannot be depended on for now.
+    RepeatedPtrField<string>* dependency = file_proto->mutable_dependency();
+    for (RepeatedPtrField<string>::iterator it = dependency->begin();
+         it != dependency->end(); ++it) {
+      if (*it != kDescriptorFile) {
+        dependency->erase(it);
+        break;
+      }
+    }
+
+    // Filter out all extensions, since we do not support extension yet.
+    file_proto->clear_extension();
+    RepeatedPtrField<DescriptorProto>* message_type =
+        file_proto->mutable_message_type();
+    for (RepeatedPtrField<DescriptorProto>::iterator it = message_type->begin();
+         it != message_type->end(); ++it) {
+      it->clear_extension();
+    }
+
     string files_data;
     files.SerializeToString(&files_data);
 
@@ -684,7 +994,7 @@ void GenerateUseDeclaration(bool is_descriptor, io::Printer* printer) {
         "use Google\\Protobuf\\Internal\\GPBType;\n"
         "use Google\\Protobuf\\Internal\\GPBWire;\n"
         "use Google\\Protobuf\\Internal\\RepeatedField;\n"
-        "use Google\\Protobuf\\Internal\\InputStream;\n\n"
+        "use Google\\Protobuf\\Internal\\InputStream;\n"
         "use Google\\Protobuf\\Internal\\GPBUtil;\n\n");
   }
 }
@@ -712,8 +1022,8 @@ std::string FilenameToClassname(const string& filename) {
 void GenerateMetadataFile(const FileDescriptor* file,
                           bool is_descriptor,
                           GeneratorContext* generator_context) {
-  std::string filename = GeneratedMetadataFileName(file->name(), is_descriptor);
-  scoped_ptr<io::ZeroCopyOutputStream> output(
+  std::string filename = GeneratedMetadataFileName(file, is_descriptor);
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(filename));
   io::Printer printer(output.get(), '^');
 
@@ -722,12 +1032,12 @@ void GenerateMetadataFile(const FileDescriptor* file,
   std::string fullname = FilenameToClassname(filename);
   int lastindex = fullname.find_last_of("\\");
 
-  printer.Print(
-      "namespace ^name^;\n\n",
-      "name", fullname.substr(0, lastindex));
-
   if (lastindex != string::npos) {
     printer.Print(
+        "namespace ^name^;\n\n",
+        "name", fullname.substr(0, lastindex));
+
+    printer.Print(
         "class ^name^\n"
         "{\n",
         "name", fullname.substr(lastindex + 1));
@@ -745,10 +1055,48 @@ void GenerateMetadataFile(const FileDescriptor* file,
   printer.Print("}\n\n");
 }
 
+template <typename DescriptorType>
+void LegacyGenerateClassFile(const FileDescriptor* file, const DescriptorType* desc,
+                         bool is_descriptor,
+                         GeneratorContext* generator_context) {
+
+  std::string filename = LegacyGeneratedClassFileName(desc, is_descriptor);
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
+      generator_context->Open(filename));
+  io::Printer printer(output.get(), '^');
+
+  GenerateHead(file, &printer);
+
+  std::string php_namespace = RootPhpNamespace(desc, is_descriptor);
+  if (php_namespace != "") {
+    printer.Print(
+        "namespace ^name^;\n\n",
+        "name", php_namespace);
+  }
+  std::string newname = FullClassName(desc, is_descriptor);
+  printer.Print("if (false) {\n");
+  Indent(&printer);
+  printer.Print("/**\n");
+  printer.Print(" * This class is deprecated. Use ^new^ instead.\n",
+      "new", newname);
+  printer.Print(" * @deprecated\n");
+  printer.Print(" */\n");
+  printer.Print("class ^old^ {}\n",
+      "old", LegacyGeneratedClassName(desc));
+  Outdent(&printer);
+  printer.Print("}\n");
+  printer.Print("class_exists(^new^::class);\n",
+      "new", GeneratedClassNameImpl(desc));
+  printer.Print("@trigger_error('^old^ is deprecated and will be removed in "
+      "the next major release. Use ^fullname^ instead', E_USER_DEPRECATED);\n\n",
+      "old", LegacyFullClassName(desc, is_descriptor),
+      "fullname", newname);
+}
+
 void GenerateEnumFile(const FileDescriptor* file, const EnumDescriptor* en,
                       bool is_descriptor, GeneratorContext* generator_context) {
-  std::string filename = GeneratedEnumFileName(en, is_descriptor);
-  scoped_ptr<io::ZeroCopyOutputStream> output(
+  std::string filename = GeneratedClassFileName(en, is_descriptor);
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(filename));
   io::Printer printer(output.get(), '^');
 
@@ -757,37 +1105,45 @@ void GenerateEnumFile(const FileDescriptor* file, const EnumDescriptor* en,
   std::string fullname = FilenameToClassname(filename);
   int lastindex = fullname.find_last_of("\\");
 
-  if (!file->package().empty()) {
+  if (lastindex != string::npos) {
     printer.Print(
         "namespace ^name^;\n\n",
         "name", fullname.substr(0, lastindex));
   }
 
-  GenerateEnumDocComment(&printer, en);
-
   if (lastindex != string::npos) {
-    printer.Print(
-        "class ^name^\n"
-        "{\n",
-        "name", fullname.substr(lastindex + 1));
-  } else {
-    printer.Print(
-        "class ^name^\n"
-        "{\n",
-        "name", fullname);
+    fullname = fullname.substr(lastindex + 1);
   }
+
+  GenerateEnumDocComment(&printer, en, is_descriptor);
+
+  printer.Print(
+      "class ^name^\n"
+      "{\n",
+      "name", fullname);
   Indent(&printer);
 
   for (int i = 0; i < en->value_count(); i++) {
     const EnumValueDescriptor* value = en->value(i);
     GenerateEnumValueDocComment(&printer, value);
     printer.Print("const ^name^ = ^number^;\n",
-                  "name", value->name(),
+                  "name", ConstantNamePrefix(value->name()) + value->name(),
                   "number", IntToString(value->number()));
   }
 
   Outdent(&printer);
   printer.Print("}\n\n");
+
+  // write legacy file for backwards compatiblity with nested messages and enums
+  if (en->containing_type() != NULL) {
+    printer.Print(
+        "// Adding a class alias for backwards compatibility with the previous class name.\n");
+    printer.Print(
+        "class_alias(^new^::class, \\^old^::class);\n\n",
+        "new", fullname,
+        "old", LegacyFullClassName(en, is_descriptor));
+    LegacyGenerateClassFile(file, en, is_descriptor, generator_context);
+  }
 }
 
 void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
@@ -799,8 +1155,8 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
     return;
   }
 
-  std::string filename = GeneratedMessageFileName(message, is_descriptor);
-  scoped_ptr<io::ZeroCopyOutputStream> output(
+  std::string filename = GeneratedClassFileName(message, is_descriptor);
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(filename));
   io::Printer printer(output.get(), '^');
 
@@ -809,7 +1165,7 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
   std::string fullname = FilenameToClassname(filename);
   int lastindex = fullname.find_last_of("\\");
 
-  if (!file->package().empty()) {
+  if (lastindex != string::npos) {
     printer.Print(
         "namespace ^name^;\n\n",
         "name", fullname.substr(0, lastindex));
@@ -817,18 +1173,15 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
 
   GenerateUseDeclaration(is_descriptor, &printer);
 
-  GenerateMessageDocComment(&printer, message);
+  GenerateMessageDocComment(&printer, message, is_descriptor);
   if (lastindex != string::npos) {
-    printer.Print(
-        "class ^name^ extends \\Google\\Protobuf\\Internal\\Message\n"
-        "{\n",
-        "name", fullname.substr(lastindex + 1));
-  } else {
-    printer.Print(
-        "class ^name^ extends \\Google\\Protobuf\\Internal\\Message\n"
-        "{\n",
-        "name", fullname);
+    fullname = fullname.substr(lastindex + 1);
   }
+
+  printer.Print(
+      "class ^name^ extends \\Google\\Protobuf\\Internal\\Message\n"
+      "{\n",
+      "name", fullname);
   Indent(&printer);
 
   // Field and oneof definitions.
@@ -842,16 +1195,17 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
   }
   printer.Print("\n");
 
+  GenerateMessageConstructorDocComment(&printer, message, is_descriptor);
   printer.Print(
-      "public function __construct() {\n");
+      "public function __construct($data = NULL) {\n");
   Indent(&printer);
 
   std::string metadata_filename =
-      GeneratedMetadataFileName(file->name(), is_descriptor);
+      GeneratedMetadataFileName(file, is_descriptor);
   std::string metadata_fullname = FilenameToClassname(metadata_filename);
   printer.Print(
       "\\^fullname^::initOnce();\n"
-      "parent::__construct();\n",
+      "parent::__construct($data);\n",
       "fullname", metadata_fullname);
 
   Outdent(&printer);
@@ -865,6 +1219,9 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
   for (int i = 0; i < message->oneof_decl_count(); i++) {
     const OneofDescriptor* oneof = message->oneof_decl(i);
     printer.Print(
+      "/**\n"
+      " * @return string\n"
+      " */\n"
       "public function get^camel_name^()\n"
       "{\n"
       "    return $this->whichOneof(\"^name^\");\n"
@@ -876,6 +1233,17 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
   Outdent(&printer);
   printer.Print("}\n\n");
 
+  // write legacy file for backwards compatiblity with nested messages and enums
+  if (message->containing_type() != NULL) {
+    printer.Print(
+        "// Adding a class alias for backwards compatibility with the previous class name.\n");
+    printer.Print(
+        "class_alias(^new^::class, \\^old^::class);\n\n",
+        "new", fullname,
+        "old", LegacyFullClassName(message, is_descriptor));
+    LegacyGenerateClassFile(file, message, is_descriptor, generator_context);
+  }
+
   // Nested messages and enums.
   for (int i = 0; i < message->nested_type_count(); i++) {
     GenerateMessageFile(file, message->nested_type(i), is_descriptor,
@@ -887,6 +1255,53 @@ void GenerateMessageFile(const FileDescriptor* file, const Descriptor* message,
   }
 }
 
+void GenerateServiceFile(const FileDescriptor* file,
+  const ServiceDescriptor* service, bool is_descriptor,
+  GeneratorContext* generator_context) {
+  std::string filename = GeneratedServiceFileName(service, is_descriptor);
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
+      generator_context->Open(filename));
+  io::Printer printer(output.get(), '^');
+
+  GenerateHead(file, &printer);
+
+  std::string fullname = FilenameToClassname(filename);
+  int lastindex = fullname.find_last_of("\\");
+
+  if (!file->options().php_namespace().empty() ||
+      (!file->options().has_php_namespace() && !file->package().empty()) ||
+      lastindex != string::npos) {
+    printer.Print(
+        "namespace ^name^;\n\n",
+        "name", fullname.substr(0, lastindex));
+  }
+
+  GenerateServiceDocComment(&printer, service);
+
+  if (lastindex != string::npos) {
+      printer.Print(
+        "interface ^name^\n"
+        "{\n",
+        "name", fullname.substr(lastindex + 1));
+  } else {
+      printer.Print(
+        "interface ^name^\n"
+        "{\n",
+        "name", fullname);
+  }
+
+  Indent(&printer);
+
+  for (int i = 0; i < service->method_count(); i++) {
+    const MethodDescriptor* method = service->method(i);
+    GenerateServiceMethodDocComment(&printer, method);
+    GenerateServiceMethod(method, &printer);
+  }
+
+  Outdent(&printer);
+  printer.Print("}\n\n");
+}
+
 void GenerateFile(const FileDescriptor* file, bool is_descriptor,
                   GeneratorContext* generator_context) {
   GenerateMetadataFile(file, is_descriptor, generator_context);
@@ -898,6 +1313,12 @@ void GenerateFile(const FileDescriptor* file, bool is_descriptor,
     GenerateEnumFile(file, file->enum_type(i), is_descriptor,
                      generator_context);
   }
+  if (file->options().php_generic_services()) {
+    for (int i = 0; i < file->service_count(); i++) {
+      GenerateServiceFile(file, file->service(i), is_descriptor,
+                       generator_context);
+    }
+  }
 }
 
 static string EscapePhpdoc(const string& input) {
@@ -931,22 +1352,6 @@ static string EscapePhpdoc(const string& input) {
         // does not have a corresponding @Deprecated annotation.
         result.append("&#64;");
         break;
-      case '<':
-        // Avoid interpretation as HTML.
-        result.append("&lt;");
-        break;
-      case '>':
-        // Avoid interpretation as HTML.
-        result.append("&gt;");
-        break;
-      case '&':
-        // Avoid interpretation as HTML.
-        result.append("&amp;");
-        break;
-      case '\\':
-        // Java interprets Unicode escape sequences anywhere!
-        result.append("&#92;");
-        break;
       default:
         result.push_back(c);
         break;
@@ -959,37 +1364,38 @@ static string EscapePhpdoc(const string& input) {
 }
 
 static void GenerateDocCommentBodyForLocation(
-    io::Printer* printer, const SourceLocation& location) {
+    io::Printer* printer, const SourceLocation& location, bool trailingNewline,
+    int indentCount) {
   string comments = location.leading_comments.empty() ?
       location.trailing_comments : location.leading_comments;
   if (!comments.empty()) {
     // TODO(teboring):  Ideally we should parse the comment text as Markdown and
     //   write it back as HTML, but this requires a Markdown parser.  For now
-    //   we just use <pre> to get fixed-width text formatting.
+    //   we just use the proto comments unchanged.
 
     // If the comment itself contains block comment start or end markers,
     // HTML-escape them so that they don't accidentally close the doc comment.
     comments = EscapePhpdoc(comments);
 
-    vector<string> lines = Split(comments, "\n");
+    std::vector<string> lines = Split(comments, "\n");
     while (!lines.empty() && lines.back().empty()) {
       lines.pop_back();
     }
 
-    printer->Print(" * <pre>\n");
     for (int i = 0; i < lines.size(); i++) {
       // Most lines should start with a space.  Watch out for lines that start
       // with a /, since putting that right after the leading asterisk will
       // close the comment.
-      if (!lines[i].empty() && lines[i][0] == '/') {
+      if (indentCount == 0 && !lines[i].empty() && lines[i][0] == '/') {
         printer->Print(" * ^line^\n", "line", lines[i]);
       } else {
-        printer->Print(" *^line^\n", "line", lines[i]);
+        std::string indent = std::string(indentCount, ' ');
+        printer->Print(" *^ind^^line^\n", "ind", indent, "line", lines[i]);
       }
     }
-    printer->Print(
-        " * </pre>\n"
-        " *\n");
+    if (trailingNewline) {
+      printer->Print(" *\n");
+    }
   }
 }
 
@@ -998,7 +1404,7 @@ static void GenerateDocCommentBody(
     io::Printer* printer, const DescriptorType* descriptor) {
   SourceLocation location;
   if (descriptor->GetSourceLocation(&location)) {
-    GenerateDocCommentBodyForLocation(printer, location);
+    GenerateDocCommentBodyForLocation(printer, location, true, 0);
   }
 }
 
@@ -1014,17 +1420,59 @@ static string FirstLineOf(const string& value) {
 }
 
 void GenerateMessageDocComment(io::Printer* printer,
-                               const Descriptor* message) {
+                               const Descriptor* message, int is_descriptor) {
   printer->Print("/**\n");
   GenerateDocCommentBody(printer, message);
   printer->Print(
+    " * Generated from protobuf message <code>^messagename^</code>\n"
+    " */\n",
+    "fullname", EscapePhpdoc(FullClassName(message, is_descriptor)),
+    "messagename", EscapePhpdoc(message->full_name()));
+}
+
+void GenerateMessageConstructorDocComment(io::Printer* printer,
+                                          const Descriptor* message,
+                                          int is_descriptor) {
+  // In theory we should have slightly different comments for setters, getters,
+  // etc., but in practice everyone already knows the difference between these
+  // so it's redundant information.
+
+  // We start the comment with the main body based on the comments from the
+  // .proto file (if present). We then end with the field declaration, e.g.:
+  //   optional string foo = 5;
+  // If the field is a group, the debug string might end with {.
+  printer->Print("/**\n");
+  printer->Print(" * Constructor.\n");
+  printer->Print(" *\n");
+  printer->Print(" * @param array $data {\n");
+  printer->Print(" *     Optional. Data for populating the Message object.\n");
+  printer->Print(" *\n");
+  for (int i = 0; i < message->field_count(); i++) {
+    const FieldDescriptor* field = message->field(i);
+    printer->Print(" *     @type ^php_type^ $^var^\n",
+      "php_type", PhpSetterTypeName(field, is_descriptor),
+      "var", field->name());
+    SourceLocation location;
+    if (field->GetSourceLocation(&location)) {
+      GenerateDocCommentBodyForLocation(printer, location, false, 10);
+    }
+  }
+  printer->Print(" * }\n");
+  printer->Print(" */\n");
+}
+
+void GenerateServiceDocComment(io::Printer* printer,
+                               const ServiceDescriptor* service) {
+  printer->Print("/**\n");
+  GenerateDocCommentBody(printer, service);
+  printer->Print(
     " * Protobuf type <code>^fullname^</code>\n"
     " */\n",
-    "fullname", EscapePhpdoc(message->full_name()));
+    "fullname", EscapePhpdoc(service->full_name()));
 }
 
-void GenerateFieldDocComment(io::Printer* printer,
-                             const FieldDescriptor* field) {
+void GenerateFieldDocComment(io::Printer* printer, const FieldDescriptor* field,
+                             int is_descriptor, int function_type) {
   // In theory we should have slightly different comments for setters, getters,
   // etc., but in practice everyone already knows the difference between these
   // so it's redundant information.
@@ -1036,16 +1484,25 @@ void GenerateFieldDocComment(io::Printer* printer,
   printer->Print("/**\n");
   GenerateDocCommentBody(printer, field);
   printer->Print(
-    " * <code>^def^</code>\n",
+    " * Generated from protobuf field <code>^def^</code>\n",
     "def", EscapePhpdoc(FirstLineOf(field->DebugString())));
+  if (function_type == kFieldSetter) {
+    printer->Print(" * @param ^php_type^ $var\n",
+      "php_type", PhpSetterTypeName(field, is_descriptor));
+    printer->Print(" * @return $this\n");
+  } else if (function_type == kFieldGetter) {
+    printer->Print(" * @return ^php_type^\n",
+      "php_type", PhpGetterTypeName(field, is_descriptor));
+  }
   printer->Print(" */\n");
 }
 
-void GenerateEnumDocComment(io::Printer* printer, const EnumDescriptor* enum_) {
+void GenerateEnumDocComment(io::Printer* printer, const EnumDescriptor* enum_,
+                            int is_descriptor) {
   printer->Print("/**\n");
   GenerateDocCommentBody(printer, enum_);
   printer->Print(
-    " * Protobuf enum <code>^fullname^</code>\n"
+    " * Protobuf type <code>^fullname^</code>\n"
     " */\n",
     "fullname", EscapePhpdoc(enum_->full_name()));
 }
@@ -1055,11 +1512,28 @@ void GenerateEnumValueDocComment(io::Printer* printer,
   printer->Print("/**\n");
   GenerateDocCommentBody(printer, value);
   printer->Print(
-    " * <code>^def^</code>\n"
+    " * Generated from protobuf enum <code>^def^</code>\n"
     " */\n",
     "def", EscapePhpdoc(FirstLineOf(value->DebugString())));
 }
 
+void GenerateServiceMethodDocComment(io::Printer* printer,
+                              const MethodDescriptor* method) {
+  printer->Print("/**\n");
+  GenerateDocCommentBody(printer, method);
+  printer->Print(
+    " * Method <code>^method_name^</code>\n"
+    " *\n",
+    "method_name", EscapePhpdoc(UnderscoresToCamelCase(method->name(), false)));
+  printer->Print(
+    " * @param \\^input_type^ $request\n",
+    "input_type", EscapePhpdoc(FullClassName(method->input_type(), false)));
+  printer->Print(
+    " * @return \\^return_type^\n"
+    " */\n",
+    "return_type", EscapePhpdoc(FullClassName(method->output_type(), false)));
+}
+
 bool Generator::Generate(const FileDescriptor* file, const string& parameter,
                          GeneratorContext* generator_context,
                          string* error) const {
diff --git a/src/google/protobuf/compiler/php/php_generator.h b/src/google/protobuf/compiler/php/php_generator.h
index ce2b000a..b851d9b4 100644
--- a/src/google/protobuf/compiler/php/php_generator.h
+++ b/src/google/protobuf/compiler/php/php_generator.h
@@ -32,6 +32,7 @@
 #define GOOGLE_PROTOBUF_COMPILER_PHP_GENERATOR_H__
 
 #include <google/protobuf/compiler/code_generator.h>
+#include <google/protobuf/descriptor.h>
 
 #include <string>
 
@@ -49,6 +50,16 @@ class LIBPROTOC_EXPORT Generator
       string* error) const;
 };
 
+// To skip reserved keywords in php, some generated classname are prefixed.
+// Other code generators may need following API to figure out the actual
+// classname.
+LIBPROTOC_EXPORT std::string GeneratedClassName(
+    const google::protobuf::Descriptor* desc);
+LIBPROTOC_EXPORT std::string GeneratedClassName(
+    const google::protobuf::EnumDescriptor* desc);
+LIBPROTOC_EXPORT std::string GeneratedClassName(
+    const google::protobuf::ServiceDescriptor* desc);
+
 }  // namespace php
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/plugin.cc b/src/google/protobuf/compiler/plugin.cc
index 3848101d..9c1c757c 100644
--- a/src/google/protobuf/compiler/plugin.cc
+++ b/src/google/protobuf/compiler/plugin.cc
@@ -36,14 +36,7 @@
 #include <set>
 
 #ifdef _WIN32
-#include <io.h>
 #include <fcntl.h>
-#ifndef STDIN_FILENO
-#define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO 1
-#endif
 #else
 #include <unistd.h>
 #endif
@@ -52,14 +45,21 @@
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/compiler/plugin.pb.h>
 #include <google/protobuf/compiler/code_generator.h>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/stubs/io_win32.h>
 
 
 namespace google {
 namespace protobuf {
 namespace compiler {
 
+#if defined(_WIN32)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::setmode;
+#endif
+
 class GeneratorResponseContext : public GeneratorContext {
  public:
   GeneratorResponseContext(
@@ -127,6 +127,7 @@ bool GenerateCode(const CodeGeneratorRequest& request,
   GeneratorResponseContext context(
       request.compiler_version(), response, parsed_files);
 
+
   string error;
   bool succeeded = generator.GenerateAll(
       parsed_files, request.parameter(), &context, &error);
@@ -150,8 +151,8 @@ int PluginMain(int argc, char* argv[], const CodeGenerator* generator) {
   }
 
 #ifdef _WIN32
-  _setmode(STDIN_FILENO, _O_BINARY);
-  _setmode(STDOUT_FILENO, _O_BINARY);
+  setmode(STDIN_FILENO, _O_BINARY);
+  setmode(STDOUT_FILENO, _O_BINARY);
 #endif
 
   CodeGeneratorRequest request;
diff --git a/src/google/protobuf/compiler/plugin.pb.cc b/src/google/protobuf/compiler/plugin.pb.cc
index 4310ff1e..ef52def3 100644
--- a/src/google/protobuf/compiler/plugin.pb.cc
+++ b/src/google/protobuf/compiler/plugin.pb.cc
@@ -1,156 +1,209 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/compiler/plugin.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/compiler/plugin.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
+namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_CodeGeneratorResponse_File;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_Version;
+}  // namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto
+namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<6> scc_info_FileDescriptorProto;
+}  // namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto
 namespace google {
 namespace protobuf {
 namespace compiler {
-class VersionDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Version> {
+class VersionDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Version>
+      _instance;
 } _Version_default_instance_;
-class CodeGeneratorRequestDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorRequest> {
+class CodeGeneratorRequestDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorRequest>
+      _instance;
 } _CodeGeneratorRequest_default_instance_;
-class CodeGeneratorResponse_FileDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorResponse_File> {
+class CodeGeneratorResponse_FileDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorResponse_File>
+      _instance;
 } _CodeGeneratorResponse_File_default_instance_;
-class CodeGeneratorResponseDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorResponse> {
+class CodeGeneratorResponseDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<CodeGeneratorResponse>
+      _instance;
 } _CodeGeneratorResponse_default_instance_;
-
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto {
+static void InitDefaultsVersion() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::compiler::_Version_default_instance_;
+    new (ptr) ::google::protobuf::compiler::Version();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::compiler::Version::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOC_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Version =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsVersion}, {}};
 
-::google::protobuf::Metadata file_level_metadata[4];
+static void InitDefaultsCodeGeneratorRequest() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::compiler::_CodeGeneratorRequest_default_instance_;
+    new (ptr) ::google::protobuf::compiler::CodeGeneratorRequest();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::compiler::CodeGeneratorRequest::InitAsDefaultInstance();
+}
 
-}  // namespace
+LIBPROTOC_EXPORT ::google::protobuf::internal::SCCInfo<2> scc_info_CodeGeneratorRequest =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 2, InitDefaultsCodeGeneratorRequest}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_Version.base,}};
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, _internal_metadata_),
+static void InitDefaultsCodeGeneratorResponse_File() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::compiler::_CodeGeneratorResponse_File_default_instance_;
+    new (ptr) ::google::protobuf::compiler::CodeGeneratorResponse_File();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::compiler::CodeGeneratorResponse_File::InitAsDefaultInstance();
+}
+
+LIBPROTOC_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_CodeGeneratorResponse_File =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsCodeGeneratorResponse_File}, {}};
+
+static void InitDefaultsCodeGeneratorResponse() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::compiler::_CodeGeneratorResponse_default_instance_;
+    new (ptr) ::google::protobuf::compiler::CodeGeneratorResponse();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::compiler::CodeGeneratorResponse::InitAsDefaultInstance();
+}
+
+LIBPROTOC_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_CodeGeneratorResponse =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsCodeGeneratorResponse}, {
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorResponse_File.base,}};
+
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Version.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_CodeGeneratorRequest.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_CodeGeneratorResponse_File.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_CodeGeneratorResponse.base);
+}
+
+::google::protobuf::Metadata file_level_metadata[4];
+
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, major_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, minor_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, patch_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Version, suffix_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, major_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, minor_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, patch_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::Version, suffix_),
   1,
   2,
   3,
   0,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, file_to_generate_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, parameter_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, proto_file_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorRequest, compiler_version_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, file_to_generate_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, parameter_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, proto_file_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorRequest, compiler_version_),
   ~0u,
   0,
   ~0u,
   1,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse_File, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse_File, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse_File, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse_File, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse_File, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse_File, insertion_point_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse_File, content_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse_File, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse_File, insertion_point_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse_File, content_),
   0,
   1,
   2,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse, error_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(CodeGeneratorResponse, file_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse, error_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::compiler::CodeGeneratorResponse, file_),
   0,
   ~0u,
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, 8, sizeof(Version)},
-  { 12, 20, sizeof(CodeGeneratorRequest)},
-  { 24, 31, sizeof(CodeGeneratorResponse_File)},
-  { 34, 40, sizeof(CodeGeneratorResponse)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, 9, sizeof(::google::protobuf::compiler::Version)},
+  { 13, 22, sizeof(::google::protobuf::compiler::CodeGeneratorRequest)},
+  { 26, 34, sizeof(::google::protobuf::compiler::CodeGeneratorResponse_File)},
+  { 37, 44, sizeof(::google::protobuf::compiler::CodeGeneratorResponse)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Version_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_CodeGeneratorRequest_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_CodeGeneratorResponse_File_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_CodeGeneratorResponse_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::compiler::_Version_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::compiler::_CodeGeneratorRequest_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::compiler::_CodeGeneratorResponse_File_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::compiler::_CodeGeneratorResponse_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/compiler/plugin.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/compiler/plugin.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 4);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Version_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-  _CodeGeneratorRequest_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _CodeGeneratorResponse_File_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-  _CodeGeneratorResponse_default_instance_.Shutdown();
-  delete file_level_metadata[3].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  ::google::protobuf::protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  _Version_default_instance_.DefaultConstruct();
-  _CodeGeneratorRequest_default_instance_.DefaultConstruct();
-  _CodeGeneratorResponse_File_default_instance_.DefaultConstruct();
-  _CodeGeneratorResponse_default_instance_.DefaultConstruct();
-  _CodeGeneratorRequest_default_instance_.get_mutable()->compiler_version_ = const_cast< ::google::protobuf::compiler::Version*>(
-      ::google::protobuf::compiler::Version::internal_default_instance());
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n%google/protobuf/compiler/plugin.proto\022"
       "\030google.protobuf.compiler\032 google/protob"
       "uf/descriptor.proto\"F\n\007Version\022\r\n\005major\030"
@@ -164,33 +217,36 @@ void AddDescriptorsImpl() {
       "\t\022B\n\004file\030\017 \003(\01324.google.protobuf.compil"
       "er.CodeGeneratorResponse.File\032>\n\004File\022\014\n"
       "\004name\030\001 \001(\t\022\027\n\017insertion_point\030\002 \001(\t\022\017\n\007"
-      "content\030\017 \001(\tB7\n\034com.google.protobuf.com"
-      "pilerB\014PluginProtosZ\tplugin_go"
+      "content\030\017 \001(\tBg\n\034com.google.protobuf.com"
+      "pilerB\014PluginProtosZ9github.com/golang/p"
+      "rotobuf/protoc-gen-go/plugin;plugin_go"
   };
   ::google::protobuf::DescriptorPool::InternalAddGeneratedFile(
-      descriptor, 590);
+      descriptor, 638);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/compiler/plugin.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::protobuf_google_2fprotobuf_2fdescriptor_2eproto::AddDescriptors();
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::AddDescriptors();
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto
-
+namespace google {
+namespace protobuf {
+namespace compiler {
 
 // ===================================================================
 
+void Version::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Version::kMajorFieldNumber;
 const int Version::kMinorFieldNumber;
@@ -200,33 +256,31 @@ const int Version::kSuffixFieldNumber;
 
 Version::Version()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_Version.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.compiler.Version)
 }
 Version::Version(const Version& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   suffix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_suffix()) {
     suffix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.suffix_);
   }
   ::memcpy(&major_, &from.major_,
-    reinterpret_cast<char*>(&patch_) -
-    reinterpret_cast<char*>(&major_) + sizeof(patch_));
+    static_cast<size_t>(reinterpret_cast<char*>(&patch_) -
+    reinterpret_cast<char*>(&major_)) + sizeof(patch_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.compiler.Version)
 }
 
 void Version::SharedCtor() {
-  _cached_size_ = 0;
   suffix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&major_, 0, reinterpret_cast<char*>(&patch_) -
-    reinterpret_cast<char*>(&major_) + sizeof(patch_));
+  ::memset(&major_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&patch_) -
+      reinterpret_cast<char*>(&major_)) + sizeof(patch_));
 }
 
 Version::~Version() {
@@ -239,37 +293,33 @@ void Version::SharedDtor() {
 }
 
 void Version::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Version::descriptor() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Version& Version::default_instance() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_Version.base);
   return *internal_default_instance();
 }
 
-Version* Version::New(::google::protobuf::Arena* arena) const {
-  Version* n = new Version;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void Version::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.compiler.Version)
-  if (has_suffix()) {
-    GOOGLE_DCHECK(!suffix_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-    (*suffix_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 0x00000001u) {
+    suffix_.ClearNonDefaultToEmptyNoArena();
   }
-  if (_has_bits_[0 / 32] & 14u) {
-    ::memset(&major_, 0, reinterpret_cast<char*>(&patch_) -
-      reinterpret_cast<char*>(&major_) + sizeof(patch_));
+  if (cached_has_bits & 14u) {
+    ::memset(&major_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&patch_) -
+        reinterpret_cast<char*>(&major_)) + sizeof(patch_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -281,14 +331,14 @@ bool Version::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.compiler.Version)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional int32 major = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           set_has_major();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -302,7 +352,7 @@ bool Version::MergePartialFromCodedStream(
       // optional int32 minor = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_minor();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -316,7 +366,7 @@ bool Version::MergePartialFromCodedStream(
       // optional int32 patch = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_patch();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -330,11 +380,11 @@ bool Version::MergePartialFromCodedStream(
       // optional string suffix = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_suffix()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->suffix().data(), this->suffix().length(),
+            this->suffix().data(), static_cast<int>(this->suffix().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.Version.suffix");
         } else {
@@ -345,13 +395,11 @@ bool Version::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -368,25 +416,29 @@ failure:
 void Version::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.compiler.Version)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 major = 1;
-  if (has_major()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->major(), output);
   }
 
   // optional int32 minor = 2;
-  if (has_minor()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->minor(), output);
   }
 
   // optional int32 patch = 3;
-  if (has_patch()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(3, this->patch(), output);
   }
 
   // optional string suffix = 4;
-  if (has_suffix()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->suffix().data(), this->suffix().length(),
+      this->suffix().data(), static_cast<int>(this->suffix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.Version.suffix");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -395,34 +447,38 @@ void Version::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.compiler.Version)
 }
 
 ::google::protobuf::uint8* Version::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.compiler.Version)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 major = 1;
-  if (has_major()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->major(), target);
   }
 
   // optional int32 minor = 2;
-  if (has_minor()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->minor(), target);
   }
 
   // optional int32 patch = 3;
-  if (has_patch()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(3, this->patch(), target);
   }
 
   // optional string suffix = 4;
-  if (has_suffix()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->suffix().data(), this->suffix().length(),
+      this->suffix().data(), static_cast<int>(this->suffix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.Version.suffix");
     target =
@@ -432,7 +488,7 @@ void Version::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.compiler.Version)
   return target;
@@ -445,7 +501,7 @@ size_t Version::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 15u) {
     // optional string suffix = 4;
@@ -478,9 +534,7 @@ size_t Version::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -503,20 +557,25 @@ void Version::MergeFrom(const Version& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.compiler.Version)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 15u) {
-    if (from.has_suffix()) {
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 15u) {
+    if (cached_has_bits & 0x00000001u) {
       set_has_suffix();
       suffix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.suffix_);
     }
-    if (from.has_major()) {
-      set_major(from.major());
+    if (cached_has_bits & 0x00000002u) {
+      major_ = from.major_;
     }
-    if (from.has_minor()) {
-      set_minor(from.minor());
+    if (cached_has_bits & 0x00000004u) {
+      minor_ = from.minor_;
     }
-    if (from.has_patch()) {
-      set_patch(from.patch());
+    if (cached_has_bits & 0x00000008u) {
+      patch_ = from.patch_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -543,161 +602,31 @@ void Version::Swap(Version* other) {
   InternalSwap(other);
 }
 void Version::InternalSwap(Version* other) {
-  suffix_.Swap(&other->suffix_);
-  std::swap(major_, other->major_);
-  std::swap(minor_, other->minor_);
-  std::swap(patch_, other->patch_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  suffix_.Swap(&other->suffix_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(major_, other->major_);
+  swap(minor_, other->minor_);
+  swap(patch_, other->patch_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata Version::GetMetadata() const {
   protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Version
 
-// optional int32 major = 1;
-bool Version::has_major() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void Version::set_has_major() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void Version::clear_has_major() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void Version::clear_major() {
-  major_ = 0;
-  clear_has_major();
-}
-::google::protobuf::int32 Version::major() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.Version.major)
-  return major_;
-}
-void Version::set_major(::google::protobuf::int32 value) {
-  set_has_major();
-  major_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.Version.major)
-}
-
-// optional int32 minor = 2;
-bool Version::has_minor() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void Version::set_has_minor() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void Version::clear_has_minor() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void Version::clear_minor() {
-  minor_ = 0;
-  clear_has_minor();
-}
-::google::protobuf::int32 Version::minor() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.Version.minor)
-  return minor_;
-}
-void Version::set_minor(::google::protobuf::int32 value) {
-  set_has_minor();
-  minor_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.Version.minor)
-}
-
-// optional int32 patch = 3;
-bool Version::has_patch() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void Version::set_has_patch() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void Version::clear_has_patch() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void Version::clear_patch() {
-  patch_ = 0;
-  clear_has_patch();
-}
-::google::protobuf::int32 Version::patch() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.Version.patch)
-  return patch_;
-}
-void Version::set_patch(::google::protobuf::int32 value) {
-  set_has_patch();
-  patch_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.Version.patch)
-}
+// ===================================================================
 
-// optional string suffix = 4;
-bool Version::has_suffix() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void Version::set_has_suffix() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void Version::clear_has_suffix() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void Version::clear_suffix() {
-  suffix_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_suffix();
-}
-const ::std::string& Version::suffix() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.Version.suffix)
-  return suffix_.GetNoArena();
-}
-void Version::set_suffix(const ::std::string& value) {
-  set_has_suffix();
-  suffix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.Version.suffix)
-}
-#if LANG_CXX11
-void Version::set_suffix(::std::string&& value) {
-  set_has_suffix();
-  suffix_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.Version.suffix)
+void CodeGeneratorRequest::InitAsDefaultInstance() {
+  ::google::protobuf::compiler::_CodeGeneratorRequest_default_instance_._instance.get_mutable()->compiler_version_ = const_cast< ::google::protobuf::compiler::Version*>(
+      ::google::protobuf::compiler::Version::internal_default_instance());
 }
-#endif
-void Version::set_suffix(const char* value) {
-  set_has_suffix();
-  suffix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.Version.suffix)
-}
-void Version::set_suffix(const char* value, size_t size) {
-  set_has_suffix();
-  suffix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.Version.suffix)
-}
-::std::string* Version::mutable_suffix() {
-  set_has_suffix();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.Version.suffix)
-  return suffix_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* Version::release_suffix() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.Version.suffix)
-  clear_has_suffix();
-  return suffix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void Version::set_allocated_suffix(::std::string* suffix) {
-  if (suffix != NULL) {
-    set_has_suffix();
-  } else {
-    clear_has_suffix();
-  }
-  suffix_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), suffix);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.Version.suffix)
+void CodeGeneratorRequest::clear_proto_file() {
+  proto_file_.Clear();
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int CodeGeneratorRequest::kFileToGenerateFieldNumber;
 const int CodeGeneratorRequest::kParameterFieldNumber;
@@ -707,9 +636,8 @@ const int CodeGeneratorRequest::kCompilerVersionFieldNumber;
 
 CodeGeneratorRequest::CodeGeneratorRequest()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorRequest.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.compiler.CodeGeneratorRequest)
 }
@@ -717,7 +645,6 @@ CodeGeneratorRequest::CodeGeneratorRequest(const CodeGeneratorRequest& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       file_to_generate_(from.file_to_generate_),
       proto_file_(from.proto_file_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
@@ -734,7 +661,6 @@ CodeGeneratorRequest::CodeGeneratorRequest(const CodeGeneratorRequest& from)
 }
 
 void CodeGeneratorRequest::SharedCtor() {
-  _cached_size_ = 0;
   parameter_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   compiler_version_ = NULL;
 }
@@ -746,46 +672,39 @@ CodeGeneratorRequest::~CodeGeneratorRequest() {
 
 void CodeGeneratorRequest::SharedDtor() {
   parameter_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete compiler_version_;
-  }
+  if (this != internal_default_instance()) delete compiler_version_;
 }
 
 void CodeGeneratorRequest::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* CodeGeneratorRequest::descriptor() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const CodeGeneratorRequest& CodeGeneratorRequest::default_instance() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorRequest.base);
   return *internal_default_instance();
 }
 
-CodeGeneratorRequest* CodeGeneratorRequest::New(::google::protobuf::Arena* arena) const {
-  CodeGeneratorRequest* n = new CodeGeneratorRequest;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void CodeGeneratorRequest::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.compiler.CodeGeneratorRequest)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   file_to_generate_.Clear();
   proto_file_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_parameter()) {
-      GOOGLE_DCHECK(!parameter_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*parameter_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      parameter_.ClearNonDefaultToEmptyNoArena();
     }
-    if (has_compiler_version()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(compiler_version_ != NULL);
-      compiler_version_->::google::protobuf::compiler::Version::Clear();
+      compiler_version_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -798,19 +717,19 @@ bool CodeGeneratorRequest::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.compiler.CodeGeneratorRequest)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated string file_to_generate = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_file_to_generate()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
             this->file_to_generate(this->file_to_generate_size() - 1).data(),
-            this->file_to_generate(this->file_to_generate_size() - 1).length(),
+            static_cast<int>(this->file_to_generate(this->file_to_generate_size() - 1).length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorRequest.file_to_generate");
         } else {
@@ -822,11 +741,11 @@ bool CodeGeneratorRequest::MergePartialFromCodedStream(
       // optional string parameter = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_parameter()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->parameter().data(), this->parameter().length(),
+            this->parameter().data(), static_cast<int>(this->parameter().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorRequest.parameter");
         } else {
@@ -838,8 +757,8 @@ bool CodeGeneratorRequest::MergePartialFromCodedStream(
       // optional .google.protobuf.compiler.Version compiler_version = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_compiler_version()));
         } else {
           goto handle_unusual;
@@ -850,26 +769,22 @@ bool CodeGeneratorRequest::MergePartialFromCodedStream(
       // repeated .google.protobuf.FileDescriptorProto proto_file = 15;
       case 15: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(122u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(122u /* 122 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_proto_file()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -886,20 +801,24 @@ failure:
 void CodeGeneratorRequest::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.compiler.CodeGeneratorRequest)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated string file_to_generate = 1;
   for (int i = 0, n = this->file_to_generate_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->file_to_generate(i).data(), this->file_to_generate(i).length(),
+      this->file_to_generate(i).data(), static_cast<int>(this->file_to_generate(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorRequest.file_to_generate");
     ::google::protobuf::internal::WireFormatLite::WriteString(
       1, this->file_to_generate(i), output);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string parameter = 2;
-  if (has_parameter()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->parameter().data(), this->parameter().length(),
+      this->parameter().data(), static_cast<int>(this->parameter().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorRequest.parameter");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -907,42 +826,49 @@ void CodeGeneratorRequest::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.compiler.Version compiler_version = 3;
-  if (has_compiler_version()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, *this->compiler_version_, output);
+      3, this->_internal_compiler_version(), output);
   }
 
   // repeated .google.protobuf.FileDescriptorProto proto_file = 15;
-  for (unsigned int i = 0, n = this->proto_file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->proto_file_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      15, this->proto_file(i), output);
+      15,
+      this->proto_file(static_cast<int>(i)),
+      output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.compiler.CodeGeneratorRequest)
 }
 
 ::google::protobuf::uint8* CodeGeneratorRequest::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.compiler.CodeGeneratorRequest)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated string file_to_generate = 1;
   for (int i = 0, n = this->file_to_generate_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->file_to_generate(i).data(), this->file_to_generate(i).length(),
+      this->file_to_generate(i).data(), static_cast<int>(this->file_to_generate(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorRequest.file_to_generate");
     target = ::google::protobuf::internal::WireFormatLite::
       WriteStringToArray(1, this->file_to_generate(i), target);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string parameter = 2;
-  if (has_parameter()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->parameter().data(), this->parameter().length(),
+      this->parameter().data(), static_cast<int>(this->parameter().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorRequest.parameter");
     target =
@@ -951,22 +877,23 @@ void CodeGeneratorRequest::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.compiler.Version compiler_version = 3;
-  if (has_compiler_version()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, *this->compiler_version_, false, target);
+      InternalWriteMessageToArray(
+        3, this->_internal_compiler_version(), deterministic, target);
   }
 
   // repeated .google.protobuf.FileDescriptorProto proto_file = 15;
-  for (unsigned int i = 0, n = this->proto_file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->proto_file_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        15, this->proto_file(i), false, target);
+      InternalWriteMessageToArray(
+        15, this->proto_file(static_cast<int>(i)), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.compiler.CodeGeneratorRequest)
   return target;
@@ -979,7 +906,7 @@ size_t CodeGeneratorRequest::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated string file_to_generate = 1;
   total_size += 1 *
@@ -991,12 +918,12 @@ size_t CodeGeneratorRequest::ByteSizeLong() const {
 
   // repeated .google.protobuf.FileDescriptorProto proto_file = 15;
   {
-    unsigned int count = this->proto_file_size();
+    unsigned int count = static_cast<unsigned int>(this->proto_file_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->proto_file(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->proto_file(static_cast<int>(i)));
     }
   }
 
@@ -1011,15 +938,13 @@ size_t CodeGeneratorRequest::ByteSizeLong() const {
     // optional .google.protobuf.compiler.Version compiler_version = 3;
     if (has_compiler_version()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->compiler_version_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *compiler_version_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1042,14 +967,18 @@ void CodeGeneratorRequest::MergeFrom(const CodeGeneratorRequest& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.compiler.CodeGeneratorRequest)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   file_to_generate_.MergeFrom(from.file_to_generate_);
   proto_file_.MergeFrom(from.proto_file_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_parameter()) {
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
       set_has_parameter();
       parameter_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.parameter_);
     }
-    if (from.has_compiler_version()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_compiler_version()->::google::protobuf::compiler::Version::MergeFrom(from.compiler_version());
     }
   }
@@ -1079,231 +1008,26 @@ void CodeGeneratorRequest::Swap(CodeGeneratorRequest* other) {
   InternalSwap(other);
 }
 void CodeGeneratorRequest::InternalSwap(CodeGeneratorRequest* other) {
-  file_to_generate_.UnsafeArenaSwap(&other->file_to_generate_);
-  proto_file_.UnsafeArenaSwap(&other->proto_file_);
-  parameter_.Swap(&other->parameter_);
-  std::swap(compiler_version_, other->compiler_version_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  file_to_generate_.InternalSwap(CastToBase(&other->file_to_generate_));
+  CastToBase(&proto_file_)->InternalSwap(CastToBase(&other->proto_file_));
+  parameter_.Swap(&other->parameter_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(compiler_version_, other->compiler_version_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata CodeGeneratorRequest::GetMetadata() const {
   protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[1];
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// CodeGeneratorRequest
-
-// repeated string file_to_generate = 1;
-int CodeGeneratorRequest::file_to_generate_size() const {
-  return file_to_generate_.size();
-}
-void CodeGeneratorRequest::clear_file_to_generate() {
-  file_to_generate_.Clear();
-}
-const ::std::string& CodeGeneratorRequest::file_to_generate(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  return file_to_generate_.Get(index);
-}
-::std::string* CodeGeneratorRequest::mutable_file_to_generate(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  return file_to_generate_.Mutable(index);
-}
-void CodeGeneratorRequest::set_file_to_generate(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  file_to_generate_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void CodeGeneratorRequest::set_file_to_generate(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  file_to_generate_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void CodeGeneratorRequest::set_file_to_generate(int index, const char* value) {
-  file_to_generate_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-void CodeGeneratorRequest::set_file_to_generate(int index, const char* value, size_t size) {
-  file_to_generate_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-::std::string* CodeGeneratorRequest::add_file_to_generate() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  return file_to_generate_.Add();
-}
-void CodeGeneratorRequest::add_file_to_generate(const ::std::string& value) {
-  file_to_generate_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-#if LANG_CXX11
-void CodeGeneratorRequest::add_file_to_generate(::std::string&& value) {
-  file_to_generate_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-#endif
-void CodeGeneratorRequest::add_file_to_generate(const char* value) {
-  file_to_generate_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-void CodeGeneratorRequest::add_file_to_generate(const char* value, size_t size) {
-  file_to_generate_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-}
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-CodeGeneratorRequest::file_to_generate() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  return file_to_generate_;
-}
-::google::protobuf::RepeatedPtrField< ::std::string>*
-CodeGeneratorRequest::mutable_file_to_generate() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
-  return &file_to_generate_;
-}
-
-// optional string parameter = 2;
-bool CodeGeneratorRequest::has_parameter() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void CodeGeneratorRequest::set_has_parameter() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void CodeGeneratorRequest::clear_has_parameter() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void CodeGeneratorRequest::clear_parameter() {
-  parameter_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_parameter();
-}
-const ::std::string& CodeGeneratorRequest::parameter() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-  return parameter_.GetNoArena();
-}
-void CodeGeneratorRequest::set_parameter(const ::std::string& value) {
-  set_has_parameter();
-  parameter_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-}
-#if LANG_CXX11
-void CodeGeneratorRequest::set_parameter(::std::string&& value) {
-  set_has_parameter();
-  parameter_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-}
-#endif
-void CodeGeneratorRequest::set_parameter(const char* value) {
-  set_has_parameter();
-  parameter_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-}
-void CodeGeneratorRequest::set_parameter(const char* value, size_t size) {
-  set_has_parameter();
-  parameter_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-}
-::std::string* CodeGeneratorRequest::mutable_parameter() {
-  set_has_parameter();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-  return parameter_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* CodeGeneratorRequest::release_parameter() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-  clear_has_parameter();
-  return parameter_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void CodeGeneratorRequest::set_allocated_parameter(::std::string* parameter) {
-  if (parameter != NULL) {
-    set_has_parameter();
-  } else {
-    clear_has_parameter();
-  }
-  parameter_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), parameter);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorRequest.parameter)
-}
-
-// repeated .google.protobuf.FileDescriptorProto proto_file = 15;
-int CodeGeneratorRequest::proto_file_size() const {
-  return proto_file_.size();
-}
-void CodeGeneratorRequest::clear_proto_file() {
-  proto_file_.Clear();
-}
-const ::google::protobuf::FileDescriptorProto& CodeGeneratorRequest::proto_file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_.Get(index);
-}
-::google::protobuf::FileDescriptorProto* CodeGeneratorRequest::mutable_proto_file(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_.Mutable(index);
-}
-::google::protobuf::FileDescriptorProto* CodeGeneratorRequest::add_proto_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
-CodeGeneratorRequest::mutable_proto_file() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return &proto_file_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
-CodeGeneratorRequest::proto_file() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_;
-}
-
-// optional .google.protobuf.compiler.Version compiler_version = 3;
-bool CodeGeneratorRequest::has_compiler_version() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void CodeGeneratorRequest::set_has_compiler_version() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void CodeGeneratorRequest::clear_has_compiler_version() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void CodeGeneratorRequest::clear_compiler_version() {
-  if (compiler_version_ != NULL) compiler_version_->::google::protobuf::compiler::Version::Clear();
-  clear_has_compiler_version();
-}
-const ::google::protobuf::compiler::Version& CodeGeneratorRequest::compiler_version() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-  return compiler_version_ != NULL ? *compiler_version_
-                         : *::google::protobuf::compiler::Version::internal_default_instance();
-}
-::google::protobuf::compiler::Version* CodeGeneratorRequest::mutable_compiler_version() {
-  set_has_compiler_version();
-  if (compiler_version_ == NULL) {
-    compiler_version_ = new ::google::protobuf::compiler::Version;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-  return compiler_version_;
-}
-::google::protobuf::compiler::Version* CodeGeneratorRequest::release_compiler_version() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-  clear_has_compiler_version();
-  ::google::protobuf::compiler::Version* temp = compiler_version_;
-  compiler_version_ = NULL;
-  return temp;
-}
-void CodeGeneratorRequest::set_allocated_compiler_version(::google::protobuf::compiler::Version* compiler_version) {
-  delete compiler_version_;
-  compiler_version_ = compiler_version;
-  if (compiler_version) {
-    set_has_compiler_version();
-  } else {
-    clear_has_compiler_version();
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void CodeGeneratorResponse_File::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int CodeGeneratorResponse_File::kNameFieldNumber;
 const int CodeGeneratorResponse_File::kInsertionPointFieldNumber;
@@ -1312,17 +1036,15 @@ const int CodeGeneratorResponse_File::kContentFieldNumber;
 
 CodeGeneratorResponse_File::CodeGeneratorResponse_File()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorResponse_File.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.compiler.CodeGeneratorResponse.File)
 }
 CodeGeneratorResponse_File::CodeGeneratorResponse_File(const CodeGeneratorResponse_File& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
@@ -1340,7 +1062,6 @@ CodeGeneratorResponse_File::CodeGeneratorResponse_File(const CodeGeneratorRespon
 }
 
 void CodeGeneratorResponse_File::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   insertion_point_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   content_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
@@ -1358,42 +1079,35 @@ void CodeGeneratorResponse_File::SharedDtor() {
 }
 
 void CodeGeneratorResponse_File::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* CodeGeneratorResponse_File::descriptor() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const CodeGeneratorResponse_File& CodeGeneratorResponse_File::default_instance() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorResponse_File.base);
   return *internal_default_instance();
 }
 
-CodeGeneratorResponse_File* CodeGeneratorResponse_File::New(::google::protobuf::Arena* arena) const {
-  CodeGeneratorResponse_File* n = new CodeGeneratorResponse_File;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void CodeGeneratorResponse_File::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.compiler.CodeGeneratorResponse.File)
-  if (_has_bits_[0 / 32] & 7u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmptyNoArena();
     }
-    if (has_insertion_point()) {
-      GOOGLE_DCHECK(!insertion_point_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*insertion_point_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      insertion_point_.ClearNonDefaultToEmptyNoArena();
     }
-    if (has_content()) {
-      GOOGLE_DCHECK(!content_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*content_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      content_.ClearNonDefaultToEmptyNoArena();
     }
   }
   _has_bits_.Clear();
@@ -1406,18 +1120,18 @@ bool CodeGeneratorResponse_File::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.compiler.CodeGeneratorResponse.File)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorResponse.File.name");
         } else {
@@ -1429,11 +1143,11 @@ bool CodeGeneratorResponse_File::MergePartialFromCodedStream(
       // optional string insertion_point = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_insertion_point()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->insertion_point().data(), this->insertion_point().length(),
+            this->insertion_point().data(), static_cast<int>(this->insertion_point().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point");
         } else {
@@ -1445,11 +1159,11 @@ bool CodeGeneratorResponse_File::MergePartialFromCodedStream(
       // optional string content = 15;
       case 15: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(122u)) {
+            static_cast< ::google::protobuf::uint8>(122u /* 122 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_content()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->content().data(), this->content().length(),
+            this->content().data(), static_cast<int>(this->content().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorResponse.File.content");
         } else {
@@ -1460,13 +1174,11 @@ bool CodeGeneratorResponse_File::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1483,10 +1195,14 @@ failure:
 void CodeGeneratorResponse_File::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.compiler.CodeGeneratorResponse.File)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1494,9 +1210,9 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
   }
 
   // optional string insertion_point = 2;
-  if (has_insertion_point()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->insertion_point().data(), this->insertion_point().length(),
+      this->insertion_point().data(), static_cast<int>(this->insertion_point().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1504,9 +1220,9 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
   }
 
   // optional string content = 15;
-  if (has_content()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->content().data(), this->content().length(),
+      this->content().data(), static_cast<int>(this->content().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.content");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1515,19 +1231,23 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.compiler.CodeGeneratorResponse.File)
 }
 
 ::google::protobuf::uint8* CodeGeneratorResponse_File::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.compiler.CodeGeneratorResponse.File)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.name");
     target =
@@ -1536,9 +1256,9 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
   }
 
   // optional string insertion_point = 2;
-  if (has_insertion_point()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->insertion_point().data(), this->insertion_point().length(),
+      this->insertion_point().data(), static_cast<int>(this->insertion_point().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point");
     target =
@@ -1547,9 +1267,9 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
   }
 
   // optional string content = 15;
-  if (has_content()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->content().data(), this->content().length(),
+      this->content().data(), static_cast<int>(this->content().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.File.content");
     target =
@@ -1559,7 +1279,7 @@ void CodeGeneratorResponse_File::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.compiler.CodeGeneratorResponse.File)
   return target;
@@ -1572,7 +1292,7 @@ size_t CodeGeneratorResponse_File::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 7u) {
     // optional string name = 1;
@@ -1598,9 +1318,7 @@ size_t CodeGeneratorResponse_File::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1623,16 +1341,20 @@ void CodeGeneratorResponse_File::MergeFrom(const CodeGeneratorResponse_File& fro
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.compiler.CodeGeneratorResponse.File)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 7u) {
-    if (from.has_name()) {
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
       set_has_name();
       name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
     }
-    if (from.has_insertion_point()) {
+    if (cached_has_bits & 0x00000002u) {
       set_has_insertion_point();
       insertion_point_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.insertion_point_);
     }
-    if (from.has_content()) {
+    if (cached_has_bits & 0x00000004u) {
       set_has_content();
       content_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.content_);
     }
@@ -1662,212 +1384,27 @@ void CodeGeneratorResponse_File::Swap(CodeGeneratorResponse_File* other) {
   InternalSwap(other);
 }
 void CodeGeneratorResponse_File::InternalSwap(CodeGeneratorResponse_File* other) {
-  name_.Swap(&other->name_);
-  insertion_point_.Swap(&other->insertion_point_);
-  content_.Swap(&other->content_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  insertion_point_.Swap(&other->insertion_point_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  content_.Swap(&other->content_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata CodeGeneratorResponse_File::GetMetadata() const {
   protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[2];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// CodeGeneratorResponse_File
-
-// optional string name = 1;
-bool CodeGeneratorResponse_File::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void CodeGeneratorResponse_File::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void CodeGeneratorResponse_File::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void CodeGeneratorResponse_File::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& CodeGeneratorResponse_File::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-  return name_.GetNoArena();
-}
-void CodeGeneratorResponse_File::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-}
-#if LANG_CXX11
-void CodeGeneratorResponse_File::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-}
-#endif
-void CodeGeneratorResponse_File::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-}
-void CodeGeneratorResponse_File::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-}
-::std::string* CodeGeneratorResponse_File::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* CodeGeneratorResponse_File::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void CodeGeneratorResponse_File::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorResponse.File.name)
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// optional string insertion_point = 2;
-bool CodeGeneratorResponse_File::has_insertion_point() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void CodeGeneratorResponse_File::set_has_insertion_point() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void CodeGeneratorResponse_File::clear_has_insertion_point() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void CodeGeneratorResponse_File::clear_insertion_point() {
-  insertion_point_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_insertion_point();
-}
-const ::std::string& CodeGeneratorResponse_File::insertion_point() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-  return insertion_point_.GetNoArena();
-}
-void CodeGeneratorResponse_File::set_insertion_point(const ::std::string& value) {
-  set_has_insertion_point();
-  insertion_point_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-}
-#if LANG_CXX11
-void CodeGeneratorResponse_File::set_insertion_point(::std::string&& value) {
-  set_has_insertion_point();
-  insertion_point_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-}
-#endif
-void CodeGeneratorResponse_File::set_insertion_point(const char* value) {
-  set_has_insertion_point();
-  insertion_point_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-}
-void CodeGeneratorResponse_File::set_insertion_point(const char* value, size_t size) {
-  set_has_insertion_point();
-  insertion_point_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-}
-::std::string* CodeGeneratorResponse_File::mutable_insertion_point() {
-  set_has_insertion_point();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-  return insertion_point_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* CodeGeneratorResponse_File::release_insertion_point() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-  clear_has_insertion_point();
-  return insertion_point_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void CodeGeneratorResponse_File::set_allocated_insertion_point(::std::string* insertion_point) {
-  if (insertion_point != NULL) {
-    set_has_insertion_point();
-  } else {
-    clear_has_insertion_point();
-  }
-  insertion_point_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), insertion_point);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
-}
-
-// optional string content = 15;
-bool CodeGeneratorResponse_File::has_content() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void CodeGeneratorResponse_File::set_has_content() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void CodeGeneratorResponse_File::clear_has_content() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void CodeGeneratorResponse_File::clear_content() {
-  content_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_content();
-}
-const ::std::string& CodeGeneratorResponse_File::content() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-  return content_.GetNoArena();
-}
-void CodeGeneratorResponse_File::set_content(const ::std::string& value) {
-  set_has_content();
-  content_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-}
-#if LANG_CXX11
-void CodeGeneratorResponse_File::set_content(::std::string&& value) {
-  set_has_content();
-  content_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-}
-#endif
-void CodeGeneratorResponse_File::set_content(const char* value) {
-  set_has_content();
-  content_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-}
-void CodeGeneratorResponse_File::set_content(const char* value, size_t size) {
-  set_has_content();
-  content_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-}
-::std::string* CodeGeneratorResponse_File::mutable_content() {
-  set_has_content();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-  return content_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* CodeGeneratorResponse_File::release_content() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-  clear_has_content();
-  return content_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void CodeGeneratorResponse_File::set_allocated_content(::std::string* content) {
-  if (content != NULL) {
-    set_has_content();
-  } else {
-    clear_has_content();
-  }
-  content_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), content);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorResponse.File.content)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void CodeGeneratorResponse::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int CodeGeneratorResponse::kErrorFieldNumber;
 const int CodeGeneratorResponse::kFileFieldNumber;
@@ -1875,9 +1412,8 @@ const int CodeGeneratorResponse::kFileFieldNumber;
 
 CodeGeneratorResponse::CodeGeneratorResponse()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorResponse.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.compiler.CodeGeneratorResponse)
 }
@@ -1885,7 +1421,6 @@ CodeGeneratorResponse::CodeGeneratorResponse(const CodeGeneratorResponse& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       file_(from.file_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   error_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
@@ -1896,7 +1431,6 @@ CodeGeneratorResponse::CodeGeneratorResponse(const CodeGeneratorResponse& from)
 }
 
 void CodeGeneratorResponse::SharedCtor() {
-  _cached_size_ = 0;
   error_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
@@ -1910,34 +1444,29 @@ void CodeGeneratorResponse::SharedDtor() {
 }
 
 void CodeGeneratorResponse::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* CodeGeneratorResponse::descriptor() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[3].descriptor;
+  ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const CodeGeneratorResponse& CodeGeneratorResponse::default_instance() {
-  protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::scc_info_CodeGeneratorResponse.base);
   return *internal_default_instance();
 }
 
-CodeGeneratorResponse* CodeGeneratorResponse::New(::google::protobuf::Arena* arena) const {
-  CodeGeneratorResponse* n = new CodeGeneratorResponse;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void CodeGeneratorResponse::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.compiler.CodeGeneratorResponse)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   file_.Clear();
-  if (has_error()) {
-    GOOGLE_DCHECK(!error_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-    (*error_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 0x00000001u) {
+    error_.ClearNonDefaultToEmptyNoArena();
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -1949,18 +1478,18 @@ bool CodeGeneratorResponse::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.compiler.CodeGeneratorResponse)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string error = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_error()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->error().data(), this->error().length(),
+            this->error().data(), static_cast<int>(this->error().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.compiler.CodeGeneratorResponse.error");
         } else {
@@ -1972,26 +1501,22 @@ bool CodeGeneratorResponse::MergePartialFromCodedStream(
       // repeated .google.protobuf.compiler.CodeGeneratorResponse.File file = 15;
       case 15: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(122u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(122u /* 122 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_file()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2008,10 +1533,14 @@ failure:
 void CodeGeneratorResponse::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.compiler.CodeGeneratorResponse)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string error = 1;
-  if (has_error()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->error().data(), this->error().length(),
+      this->error().data(), static_cast<int>(this->error().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.error");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -2019,26 +1548,33 @@ void CodeGeneratorResponse::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.compiler.CodeGeneratorResponse.File file = 15;
-  for (unsigned int i = 0, n = this->file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->file_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      15, this->file(i), output);
+      15,
+      this->file(static_cast<int>(i)),
+      output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.compiler.CodeGeneratorResponse)
 }
 
 ::google::protobuf::uint8* CodeGeneratorResponse::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.compiler.CodeGeneratorResponse)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string error = 1;
-  if (has_error()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->error().data(), this->error().length(),
+      this->error().data(), static_cast<int>(this->error().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.compiler.CodeGeneratorResponse.error");
     target =
@@ -2047,15 +1583,16 @@ void CodeGeneratorResponse::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.compiler.CodeGeneratorResponse.File file = 15;
-  for (unsigned int i = 0, n = this->file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->file_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        15, this->file(i), false, target);
+      InternalWriteMessageToArray(
+        15, this->file(static_cast<int>(i)), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.compiler.CodeGeneratorResponse)
   return target;
@@ -2068,16 +1605,16 @@ size_t CodeGeneratorResponse::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.compiler.CodeGeneratorResponse.File file = 15;
   {
-    unsigned int count = this->file_size();
+    unsigned int count = static_cast<unsigned int>(this->file_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->file(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->file(static_cast<int>(i)));
     }
   }
 
@@ -2089,9 +1626,7 @@ size_t CodeGeneratorResponse::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -2114,6 +1649,9 @@ void CodeGeneratorResponse::MergeFrom(const CodeGeneratorResponse& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.compiler.CodeGeneratorResponse)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   file_.MergeFrom(from.file_);
   if (from.has_error()) {
     set_has_error();
@@ -2144,118 +1682,38 @@ void CodeGeneratorResponse::Swap(CodeGeneratorResponse* other) {
   InternalSwap(other);
 }
 void CodeGeneratorResponse::InternalSwap(CodeGeneratorResponse* other) {
-  file_.UnsafeArenaSwap(&other->file_);
-  error_.Swap(&other->error_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&file_)->InternalSwap(CastToBase(&other->file_));
+  error_.Swap(&other->error_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata CodeGeneratorResponse::GetMetadata() const {
   protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[3];
+  return ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// CodeGeneratorResponse
-
-// optional string error = 1;
-bool CodeGeneratorResponse::has_error() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void CodeGeneratorResponse::set_has_error() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void CodeGeneratorResponse::clear_has_error() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void CodeGeneratorResponse::clear_error() {
-  error_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_error();
-}
-const ::std::string& CodeGeneratorResponse::error() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.error)
-  return error_.GetNoArena();
-}
-void CodeGeneratorResponse::set_error(const ::std::string& value) {
-  set_has_error();
-  error_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.compiler.CodeGeneratorResponse.error)
-}
-#if LANG_CXX11
-void CodeGeneratorResponse::set_error(::std::string&& value) {
-  set_has_error();
-  error_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.compiler.CodeGeneratorResponse.error)
-}
-#endif
-void CodeGeneratorResponse::set_error(const char* value) {
-  set_has_error();
-  error_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.error)
-}
-void CodeGeneratorResponse::set_error(const char* value, size_t size) {
-  set_has_error();
-  error_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.compiler.CodeGeneratorResponse.error)
-}
-::std::string* CodeGeneratorResponse::mutable_error() {
-  set_has_error();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.error)
-  return error_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* CodeGeneratorResponse::release_error() {
-  // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.error)
-  clear_has_error();
-  return error_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void CodeGeneratorResponse::set_allocated_error(::std::string* error) {
-  if (error != NULL) {
-    set_has_error();
-  } else {
-    clear_has_error();
-  }
-  error_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), error);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorResponse.error)
-}
 
-// repeated .google.protobuf.compiler.CodeGeneratorResponse.File file = 15;
-int CodeGeneratorResponse::file_size() const {
-  return file_.size();
-}
-void CodeGeneratorResponse::clear_file() {
-  file_.Clear();
-}
-const ::google::protobuf::compiler::CodeGeneratorResponse_File& CodeGeneratorResponse::file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_.Get(index);
-}
-::google::protobuf::compiler::CodeGeneratorResponse_File* CodeGeneratorResponse::mutable_file(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_.Mutable(index);
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::compiler::Version* Arena::CreateMaybeMessage< ::google::protobuf::compiler::Version >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::compiler::Version >(arena);
 }
-::google::protobuf::compiler::CodeGeneratorResponse_File* CodeGeneratorResponse::add_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_.Add();
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::compiler::CodeGeneratorRequest* Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorRequest >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::compiler::CodeGeneratorRequest >(arena);
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >*
-CodeGeneratorResponse::mutable_file() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return &file_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::compiler::CodeGeneratorResponse_File* Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorResponse_File >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::compiler::CodeGeneratorResponse_File >(arena);
 }
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >&
-CodeGeneratorResponse::file() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::compiler::CodeGeneratorResponse* Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorResponse >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::compiler::CodeGeneratorResponse >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
-}  // namespace compiler
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/compiler/plugin.pb.h b/src/google/protobuf/compiler/plugin.pb.h
index 1b91daca..5ad6b4d3 100644
--- a/src/google/protobuf/compiler/plugin.pb.h
+++ b/src/google/protobuf/compiler/plugin.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/compiler/plugin.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fcompiler_2fplugin_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fcompiler_2fplugin_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fcompiler_2fplugin_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fcompiler_2fplugin_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,7 +22,9 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
@@ -30,83 +32,28 @@
 #include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/descriptor.pb.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto LIBPROTOC_EXPORT
+#ifdef major
+#undef major
+#endif
+#ifdef minor
+#undef minor
+#endif
+
+namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOC_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[4];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOC_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto
 namespace google {
 namespace protobuf {
-class DescriptorProto;
-class DescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern DescriptorProtoDefaultTypeInternal _DescriptorProto_default_instance_;
-class DescriptorProto_ExtensionRange;
-class DescriptorProto_ExtensionRangeDefaultTypeInternal;
-LIBPROTOC_EXPORT extern DescriptorProto_ExtensionRangeDefaultTypeInternal _DescriptorProto_ExtensionRange_default_instance_;
-class DescriptorProto_ReservedRange;
-class DescriptorProto_ReservedRangeDefaultTypeInternal;
-LIBPROTOC_EXPORT extern DescriptorProto_ReservedRangeDefaultTypeInternal _DescriptorProto_ReservedRange_default_instance_;
-class EnumDescriptorProto;
-class EnumDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern EnumDescriptorProtoDefaultTypeInternal _EnumDescriptorProto_default_instance_;
-class EnumOptions;
-class EnumOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern EnumOptionsDefaultTypeInternal _EnumOptions_default_instance_;
-class EnumValueDescriptorProto;
-class EnumValueDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern EnumValueDescriptorProtoDefaultTypeInternal _EnumValueDescriptorProto_default_instance_;
-class EnumValueOptions;
-class EnumValueOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern EnumValueOptionsDefaultTypeInternal _EnumValueOptions_default_instance_;
-class FieldDescriptorProto;
-class FieldDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern FieldDescriptorProtoDefaultTypeInternal _FieldDescriptorProto_default_instance_;
-class FieldOptions;
-class FieldOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern FieldOptionsDefaultTypeInternal _FieldOptions_default_instance_;
-class FileDescriptorProto;
-class FileDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern FileDescriptorProtoDefaultTypeInternal _FileDescriptorProto_default_instance_;
-class FileDescriptorSet;
-class FileDescriptorSetDefaultTypeInternal;
-LIBPROTOC_EXPORT extern FileDescriptorSetDefaultTypeInternal _FileDescriptorSet_default_instance_;
-class FileOptions;
-class FileOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern FileOptionsDefaultTypeInternal _FileOptions_default_instance_;
-class GeneratedCodeInfo;
-class GeneratedCodeInfoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern GeneratedCodeInfoDefaultTypeInternal _GeneratedCodeInfo_default_instance_;
-class GeneratedCodeInfo_Annotation;
-class GeneratedCodeInfo_AnnotationDefaultTypeInternal;
-LIBPROTOC_EXPORT extern GeneratedCodeInfo_AnnotationDefaultTypeInternal _GeneratedCodeInfo_Annotation_default_instance_;
-class MessageOptions;
-class MessageOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern MessageOptionsDefaultTypeInternal _MessageOptions_default_instance_;
-class MethodDescriptorProto;
-class MethodDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern MethodDescriptorProtoDefaultTypeInternal _MethodDescriptorProto_default_instance_;
-class MethodOptions;
-class MethodOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern MethodOptionsDefaultTypeInternal _MethodOptions_default_instance_;
-class OneofDescriptorProto;
-class OneofDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern OneofDescriptorProtoDefaultTypeInternal _OneofDescriptorProto_default_instance_;
-class OneofOptions;
-class OneofOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern OneofOptionsDefaultTypeInternal _OneofOptions_default_instance_;
-class ServiceDescriptorProto;
-class ServiceDescriptorProtoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern ServiceDescriptorProtoDefaultTypeInternal _ServiceDescriptorProto_default_instance_;
-class ServiceOptions;
-class ServiceOptionsDefaultTypeInternal;
-LIBPROTOC_EXPORT extern ServiceOptionsDefaultTypeInternal _ServiceOptions_default_instance_;
-class SourceCodeInfo;
-class SourceCodeInfoDefaultTypeInternal;
-LIBPROTOC_EXPORT extern SourceCodeInfoDefaultTypeInternal _SourceCodeInfo_default_instance_;
-class SourceCodeInfo_Location;
-class SourceCodeInfo_LocationDefaultTypeInternal;
-LIBPROTOC_EXPORT extern SourceCodeInfo_LocationDefaultTypeInternal _SourceCodeInfo_Location_default_instance_;
-class UninterpretedOption;
-class UninterpretedOptionDefaultTypeInternal;
-LIBPROTOC_EXPORT extern UninterpretedOptionDefaultTypeInternal _UninterpretedOption_default_instance_;
-class UninterpretedOption_NamePart;
-class UninterpretedOption_NamePartDefaultTypeInternal;
-LIBPROTOC_EXPORT extern UninterpretedOption_NamePartDefaultTypeInternal _UninterpretedOption_NamePart_default_instance_;
 namespace compiler {
 class CodeGeneratorRequest;
 class CodeGeneratorRequestDefaultTypeInternal;
@@ -123,22 +70,18 @@ LIBPROTOC_EXPORT extern VersionDefaultTypeInternal _Version_default_instance_;
 }  // namespace compiler
 }  // namespace protobuf
 }  // namespace google
-
+namespace google {
+namespace protobuf {
+template<> LIBPROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorRequest* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorRequest>(Arena*);
+template<> LIBPROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorResponse* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorResponse>(Arena*);
+template<> LIBPROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorResponse_File* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorResponse_File>(Arena*);
+template<> LIBPROTOC_EXPORT ::google::protobuf::compiler::Version* Arena::CreateMaybeMessage<::google::protobuf::compiler::Version>(Arena*);
+}  // namespace protobuf
+}  // namespace google
 namespace google {
 namespace protobuf {
 namespace compiler {
 
-namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOC_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOC_EXPORT AddDescriptors();
-void LIBPROTOC_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto
-
 // ===================================================================
 
 class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_insertion_point(class_definition:google.protobuf.compiler.Version) */ {
@@ -152,11 +95,24 @@ class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Version(Version&& from) noexcept
+    : Version() {
+    *this = ::std::move(from);
+  }
 
+  inline Version& operator=(Version&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
@@ -164,42 +120,48 @@ class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_
   static const ::google::protobuf::Descriptor* descriptor();
   static const Version& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Version* internal_default_instance() {
     return reinterpret_cast<const Version*>(
                &_Version_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void Swap(Version* other);
+  friend void swap(Version& a, Version& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Version* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Version* New() const final {
+    return CreateMaybeMessage<Version>(NULL);
+  }
 
-  Version* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Version* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Version>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Version& from);
   void MergeFrom(const Version& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Version* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -210,7 +172,7 @@ class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -265,12 +227,12 @@ class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr suffix_;
   ::google::protobuf::int32 major_;
   ::google::protobuf::int32 minor_;
   ::google::protobuf::int32 patch_;
-  friend struct LIBPROTOC_EXPORT protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -285,11 +247,24 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  CodeGeneratorRequest(CodeGeneratorRequest&& from) noexcept
+    : CodeGeneratorRequest() {
+    *this = ::std::move(from);
+  }
 
+  inline CodeGeneratorRequest& operator=(CodeGeneratorRequest&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
@@ -297,42 +272,48 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
   static const ::google::protobuf::Descriptor* descriptor();
   static const CodeGeneratorRequest& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const CodeGeneratorRequest* internal_default_instance() {
     return reinterpret_cast<const CodeGeneratorRequest*>(
                &_CodeGeneratorRequest_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
   void Swap(CodeGeneratorRequest* other);
+  friend void swap(CodeGeneratorRequest& a, CodeGeneratorRequest& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline CodeGeneratorRequest* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline CodeGeneratorRequest* New() const final {
+    return CreateMaybeMessage<CodeGeneratorRequest>(NULL);
+  }
 
-  CodeGeneratorRequest* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  CodeGeneratorRequest* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<CodeGeneratorRequest>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const CodeGeneratorRequest& from);
   void MergeFrom(const CodeGeneratorRequest& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(CodeGeneratorRequest* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -343,7 +324,7 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -375,11 +356,11 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
   int proto_file_size() const;
   void clear_proto_file();
   static const int kProtoFileFieldNumber = 15;
-  const ::google::protobuf::FileDescriptorProto& proto_file(int index) const;
   ::google::protobuf::FileDescriptorProto* mutable_proto_file(int index);
-  ::google::protobuf::FileDescriptorProto* add_proto_file();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
       mutable_proto_file();
+  const ::google::protobuf::FileDescriptorProto& proto_file(int index) const;
+  ::google::protobuf::FileDescriptorProto* add_proto_file();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
       proto_file() const;
 
@@ -402,9 +383,12 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
   bool has_compiler_version() const;
   void clear_compiler_version();
   static const int kCompilerVersionFieldNumber = 3;
+  private:
+  const ::google::protobuf::compiler::Version& _internal_compiler_version() const;
+  public:
   const ::google::protobuf::compiler::Version& compiler_version() const;
-  ::google::protobuf::compiler::Version* mutable_compiler_version();
   ::google::protobuf::compiler::Version* release_compiler_version();
+  ::google::protobuf::compiler::Version* mutable_compiler_version();
   void set_allocated_compiler_version(::google::protobuf::compiler::Version* compiler_version);
 
   // @@protoc_insertion_point(class_scope:google.protobuf.compiler.CodeGeneratorRequest)
@@ -416,12 +400,12 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::std::string> file_to_generate_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto > proto_file_;
   ::google::protobuf::internal::ArenaStringPtr parameter_;
   ::google::protobuf::compiler::Version* compiler_version_;
-  friend struct LIBPROTOC_EXPORT protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -436,11 +420,24 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse_File : public ::google::protobuf::M
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  CodeGeneratorResponse_File(CodeGeneratorResponse_File&& from) noexcept
+    : CodeGeneratorResponse_File() {
+    *this = ::std::move(from);
+  }
 
+  inline CodeGeneratorResponse_File& operator=(CodeGeneratorResponse_File&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
@@ -448,42 +445,48 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse_File : public ::google::protobuf::M
   static const ::google::protobuf::Descriptor* descriptor();
   static const CodeGeneratorResponse_File& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const CodeGeneratorResponse_File* internal_default_instance() {
     return reinterpret_cast<const CodeGeneratorResponse_File*>(
                &_CodeGeneratorResponse_File_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
   void Swap(CodeGeneratorResponse_File* other);
+  friend void swap(CodeGeneratorResponse_File& a, CodeGeneratorResponse_File& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline CodeGeneratorResponse_File* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline CodeGeneratorResponse_File* New() const final {
+    return CreateMaybeMessage<CodeGeneratorResponse_File>(NULL);
+  }
 
-  CodeGeneratorResponse_File* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  CodeGeneratorResponse_File* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<CodeGeneratorResponse_File>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const CodeGeneratorResponse_File& from);
   void MergeFrom(const CodeGeneratorResponse_File& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(CodeGeneratorResponse_File* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -494,7 +497,7 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse_File : public ::google::protobuf::M
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -556,11 +559,11 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse_File : public ::google::protobuf::M
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::internal::ArenaStringPtr insertion_point_;
   ::google::protobuf::internal::ArenaStringPtr content_;
-  friend struct LIBPROTOC_EXPORT protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -575,11 +578,24 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  CodeGeneratorResponse(CodeGeneratorResponse&& from) noexcept
+    : CodeGeneratorResponse() {
+    *this = ::std::move(from);
+  }
 
+  inline CodeGeneratorResponse& operator=(CodeGeneratorResponse&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
@@ -587,42 +603,48 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
   static const ::google::protobuf::Descriptor* descriptor();
   static const CodeGeneratorResponse& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const CodeGeneratorResponse* internal_default_instance() {
     return reinterpret_cast<const CodeGeneratorResponse*>(
                &_CodeGeneratorResponse_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    3;
 
   void Swap(CodeGeneratorResponse* other);
+  friend void swap(CodeGeneratorResponse& a, CodeGeneratorResponse& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline CodeGeneratorResponse* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline CodeGeneratorResponse* New() const final {
+    return CreateMaybeMessage<CodeGeneratorResponse>(NULL);
+  }
 
-  CodeGeneratorResponse* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  CodeGeneratorResponse* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<CodeGeneratorResponse>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const CodeGeneratorResponse& from);
   void MergeFrom(const CodeGeneratorResponse& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(CodeGeneratorResponse* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -633,7 +655,7 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -645,11 +667,11 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
   int file_size() const;
   void clear_file();
   static const int kFileFieldNumber = 15;
-  const ::google::protobuf::compiler::CodeGeneratorResponse_File& file(int index) const;
   ::google::protobuf::compiler::CodeGeneratorResponse_File* mutable_file(int index);
-  ::google::protobuf::compiler::CodeGeneratorResponse_File* add_file();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >*
       mutable_file();
+  const ::google::protobuf::compiler::CodeGeneratorResponse_File& file(int index) const;
+  ::google::protobuf::compiler::CodeGeneratorResponse_File* add_file();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >&
       file() const;
 
@@ -675,17 +697,20 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File > file_;
   ::google::protobuf::internal::ArenaStringPtr error_;
-  friend struct LIBPROTOC_EXPORT protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fcompiler_2fplugin_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Version
 
 // optional int32 major = 1;
@@ -792,6 +817,7 @@ inline void Version::set_suffix(::std::string&& value) {
 }
 #endif
 inline void Version::set_suffix(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_suffix();
   suffix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.Version.suffix)
@@ -809,8 +835,11 @@ inline ::std::string* Version::mutable_suffix() {
 }
 inline ::std::string* Version::release_suffix() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.Version.suffix)
+  if (!has_suffix()) {
+    return NULL;
+  }
   clear_has_suffix();
-  return suffix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return suffix_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void Version::set_allocated_suffix(::std::string* suffix) {
   if (suffix != NULL) {
@@ -852,6 +881,7 @@ inline void CodeGeneratorRequest::set_file_to_generate(int index, ::std::string&
 }
 #endif
 inline void CodeGeneratorRequest::set_file_to_generate(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   file_to_generate_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
 }
@@ -870,11 +900,12 @@ inline void CodeGeneratorRequest::add_file_to_generate(const ::std::string& valu
 }
 #if LANG_CXX11
 inline void CodeGeneratorRequest::add_file_to_generate(::std::string&& value) {
-  file_to_generate_.Add()->assign(std::move(value));
+  file_to_generate_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
 }
 #endif
 inline void CodeGeneratorRequest::add_file_to_generate(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   file_to_generate_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.compiler.CodeGeneratorRequest.file_to_generate)
 }
@@ -925,6 +956,7 @@ inline void CodeGeneratorRequest::set_parameter(::std::string&& value) {
 }
 #endif
 inline void CodeGeneratorRequest::set_parameter(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_parameter();
   parameter_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorRequest.parameter)
@@ -942,8 +974,11 @@ inline ::std::string* CodeGeneratorRequest::mutable_parameter() {
 }
 inline ::std::string* CodeGeneratorRequest::release_parameter() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorRequest.parameter)
+  if (!has_parameter()) {
+    return NULL;
+  }
   clear_has_parameter();
-  return parameter_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return parameter_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void CodeGeneratorRequest::set_allocated_parameter(::std::string* parameter) {
   if (parameter != NULL) {
@@ -959,26 +994,23 @@ inline void CodeGeneratorRequest::set_allocated_parameter(::std::string* paramet
 inline int CodeGeneratorRequest::proto_file_size() const {
   return proto_file_.size();
 }
-inline void CodeGeneratorRequest::clear_proto_file() {
-  proto_file_.Clear();
-}
-inline const ::google::protobuf::FileDescriptorProto& CodeGeneratorRequest::proto_file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_.Get(index);
-}
 inline ::google::protobuf::FileDescriptorProto* CodeGeneratorRequest::mutable_proto_file(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
   return proto_file_.Mutable(index);
 }
-inline ::google::protobuf::FileDescriptorProto* CodeGeneratorRequest::add_proto_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
-  return proto_file_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
 CodeGeneratorRequest::mutable_proto_file() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
   return &proto_file_;
 }
+inline const ::google::protobuf::FileDescriptorProto& CodeGeneratorRequest::proto_file(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
+  return proto_file_.Get(index);
+}
+inline ::google::protobuf::FileDescriptorProto* CodeGeneratorRequest::add_proto_file() {
+  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
+  return proto_file_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
 CodeGeneratorRequest::proto_file() const {
   // @@protoc_insertion_point(field_list:google.protobuf.compiler.CodeGeneratorRequest.proto_file)
@@ -996,21 +1028,17 @@ inline void CodeGeneratorRequest::clear_has_compiler_version() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void CodeGeneratorRequest::clear_compiler_version() {
-  if (compiler_version_ != NULL) compiler_version_->::google::protobuf::compiler::Version::Clear();
+  if (compiler_version_ != NULL) compiler_version_->Clear();
   clear_has_compiler_version();
 }
+inline const ::google::protobuf::compiler::Version& CodeGeneratorRequest::_internal_compiler_version() const {
+  return *compiler_version_;
+}
 inline const ::google::protobuf::compiler::Version& CodeGeneratorRequest::compiler_version() const {
+  const ::google::protobuf::compiler::Version* p = compiler_version_;
   // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-  return compiler_version_ != NULL ? *compiler_version_
-                         : *::google::protobuf::compiler::Version::internal_default_instance();
-}
-inline ::google::protobuf::compiler::Version* CodeGeneratorRequest::mutable_compiler_version() {
-  set_has_compiler_version();
-  if (compiler_version_ == NULL) {
-    compiler_version_ = new ::google::protobuf::compiler::Version;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
-  return compiler_version_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::compiler::Version*>(
+      &::google::protobuf::compiler::_Version_default_instance_);
 }
 inline ::google::protobuf::compiler::Version* CodeGeneratorRequest::release_compiler_version() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
@@ -1019,14 +1047,31 @@ inline ::google::protobuf::compiler::Version* CodeGeneratorRequest::release_comp
   compiler_version_ = NULL;
   return temp;
 }
+inline ::google::protobuf::compiler::Version* CodeGeneratorRequest::mutable_compiler_version() {
+  set_has_compiler_version();
+  if (compiler_version_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::compiler::Version>(GetArenaNoVirtual());
+    compiler_version_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
+  return compiler_version_;
+}
 inline void CodeGeneratorRequest::set_allocated_compiler_version(::google::protobuf::compiler::Version* compiler_version) {
-  delete compiler_version_;
-  compiler_version_ = compiler_version;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete compiler_version_;
+  }
   if (compiler_version) {
+    ::google::protobuf::Arena* submessage_arena = NULL;
+    if (message_arena != submessage_arena) {
+      compiler_version = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, compiler_version, submessage_arena);
+    }
     set_has_compiler_version();
   } else {
     clear_has_compiler_version();
   }
+  compiler_version_ = compiler_version;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.compiler.CodeGeneratorRequest.compiler_version)
 }
 
@@ -1066,6 +1111,7 @@ inline void CodeGeneratorResponse_File::set_name(::std::string&& value) {
 }
 #endif
 inline void CodeGeneratorResponse_File::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
   name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.name)
@@ -1083,8 +1129,11 @@ inline ::std::string* CodeGeneratorResponse_File::mutable_name() {
 }
 inline ::std::string* CodeGeneratorResponse_File::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void CodeGeneratorResponse_File::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -1128,6 +1177,7 @@ inline void CodeGeneratorResponse_File::set_insertion_point(::std::string&& valu
 }
 #endif
 inline void CodeGeneratorResponse_File::set_insertion_point(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_insertion_point();
   insertion_point_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
@@ -1145,8 +1195,11 @@ inline ::std::string* CodeGeneratorResponse_File::mutable_insertion_point() {
 }
 inline ::std::string* CodeGeneratorResponse_File::release_insertion_point() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.insertion_point)
+  if (!has_insertion_point()) {
+    return NULL;
+  }
   clear_has_insertion_point();
-  return insertion_point_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return insertion_point_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void CodeGeneratorResponse_File::set_allocated_insertion_point(::std::string* insertion_point) {
   if (insertion_point != NULL) {
@@ -1190,6 +1243,7 @@ inline void CodeGeneratorResponse_File::set_content(::std::string&& value) {
 }
 #endif
 inline void CodeGeneratorResponse_File::set_content(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_content();
   content_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.File.content)
@@ -1207,8 +1261,11 @@ inline ::std::string* CodeGeneratorResponse_File::mutable_content() {
 }
 inline ::std::string* CodeGeneratorResponse_File::release_content() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.File.content)
+  if (!has_content()) {
+    return NULL;
+  }
   clear_has_content();
-  return content_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return content_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void CodeGeneratorResponse_File::set_allocated_content(::std::string* content) {
   if (content != NULL) {
@@ -1256,6 +1313,7 @@ inline void CodeGeneratorResponse::set_error(::std::string&& value) {
 }
 #endif
 inline void CodeGeneratorResponse::set_error(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_error();
   error_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.compiler.CodeGeneratorResponse.error)
@@ -1273,8 +1331,11 @@ inline ::std::string* CodeGeneratorResponse::mutable_error() {
 }
 inline ::std::string* CodeGeneratorResponse::release_error() {
   // @@protoc_insertion_point(field_release:google.protobuf.compiler.CodeGeneratorResponse.error)
+  if (!has_error()) {
+    return NULL;
+  }
   clear_has_error();
-  return error_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return error_.ReleaseNonDefaultNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 inline void CodeGeneratorResponse::set_allocated_error(::std::string* error) {
   if (error != NULL) {
@@ -1293,30 +1354,32 @@ inline int CodeGeneratorResponse::file_size() const {
 inline void CodeGeneratorResponse::clear_file() {
   file_.Clear();
 }
-inline const ::google::protobuf::compiler::CodeGeneratorResponse_File& CodeGeneratorResponse::file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_.Get(index);
-}
 inline ::google::protobuf::compiler::CodeGeneratorResponse_File* CodeGeneratorResponse::mutable_file(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.compiler.CodeGeneratorResponse.file)
   return file_.Mutable(index);
 }
-inline ::google::protobuf::compiler::CodeGeneratorResponse_File* CodeGeneratorResponse::add_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorResponse.file)
-  return file_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >*
 CodeGeneratorResponse::mutable_file() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.compiler.CodeGeneratorResponse.file)
   return &file_;
 }
+inline const ::google::protobuf::compiler::CodeGeneratorResponse_File& CodeGeneratorResponse::file(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.compiler.CodeGeneratorResponse.file)
+  return file_.Get(index);
+}
+inline ::google::protobuf::compiler::CodeGeneratorResponse_File* CodeGeneratorResponse::add_file() {
+  // @@protoc_insertion_point(field_add:google.protobuf.compiler.CodeGeneratorResponse.file)
+  return file_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::compiler::CodeGeneratorResponse_File >&
 CodeGeneratorResponse::file() const {
   // @@protoc_insertion_point(field_list:google.protobuf.compiler.CodeGeneratorResponse.file)
   return file_;
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -1326,11 +1389,10 @@ CodeGeneratorResponse::file() const {
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace compiler
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fcompiler_2fplugin_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fcompiler_2fplugin_2eproto
diff --git a/src/google/protobuf/compiler/plugin.proto b/src/google/protobuf/compiler/plugin.proto
index 6e4da2c1..5b557452 100644
--- a/src/google/protobuf/compiler/plugin.proto
+++ b/src/google/protobuf/compiler/plugin.proto
@@ -49,7 +49,7 @@ package google.protobuf.compiler;
 option java_package = "com.google.protobuf.compiler";
 option java_outer_classname = "PluginProtos";
 
-option go_package = "plugin_go";
+option go_package = "github.com/golang/protobuf/protoc-gen-go/plugin;plugin_go";
 
 import "google/protobuf/descriptor.proto";
 
@@ -84,10 +84,14 @@ message CodeGeneratorRequest {
   // the entire set into memory at once.  However, as of this writing, this
   // is not similarly optimized on protoc's end -- it will store all fields in
   // memory at once before sending them to the plugin.
+  //
+  // Type names of fields and extensions in the FileDescriptorProto are always
+  // fully qualified.
   repeated FileDescriptorProto proto_file = 15;
 
   // The version number of protocol compiler.
   optional Version compiler_version = 3;
+
 }
 
 // The plugin writes an encoded CodeGeneratorResponse to stdout.
diff --git a/src/google/protobuf/compiler/python/python_generator.cc b/src/google/protobuf/compiler/python/python_generator.cc
index f83f155a..01f28b37 100644
--- a/src/google/protobuf/compiler/python/python_generator.cc
+++ b/src/google/protobuf/compiler/python/python_generator.cc
@@ -49,9 +49,6 @@
 #include <limits>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <utility>
 #include <vector>
@@ -63,11 +60,12 @@
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/stringprintf.h>
 #include <google/protobuf/io/printer.h>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/descriptor.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 
+
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -75,12 +73,21 @@ namespace python {
 
 namespace {
 
+// Reimplemented here because we can't bring in
+// absl/strings/string_view_utils.h because it needs C++11.
+bool StrStartsWith(StringPiece sp, StringPiece x) {
+  return sp.size() >= x.size() && sp.substr(0, x.size()) == x;
+}
+bool StrEndsWith(StringPiece sp, StringPiece x) {
+  return sp.size() >= x.size() && sp.substr(sp.size() - x.size()) == x;
+}
+
 // Returns a copy of |filename| with any trailing ".protodevel" or ".proto
 // suffix stripped.
 // TODO(robinson): Unify with copy in compiler/cpp/internal/helpers.cc.
 string StripProto(const string& filename) {
-  const char* suffix = HasSuffixString(filename, ".protodevel")
-      ? ".protodevel" : ".proto";
+  const char* suffix =
+      StrEndsWith(filename, ".protodevel") ? ".protodevel" : ".proto";
   return StripSuffixString(filename, suffix);
 }
 
@@ -192,11 +199,6 @@ void PrintTopBoilerplate(
         "from google.protobuf import service_reflection\n");
   }
 
-  // Avoid circular imports if this module is descriptor_pb2.
-  if (!descriptor_proto) {
-    printer->Print(
-        "from google.protobuf import descriptor_pb2\n");
-  }
   printer->Print(
       "# @@protoc_insertion_point(imports)\n\n"
       "_sym_db = _symbol_database.Default()\n");
@@ -328,7 +330,7 @@ bool Generator::Generate(const FileDescriptor* file,
   fdp.SerializeToString(&file_descriptor_serialized_);
 
 
-  google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
+  std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
   GOOGLE_CHECK(output.get());
   io::Printer printer(output.get(), '$');
   printer_ = &printer;
@@ -350,7 +352,9 @@ bool Generator::Generate(const FileDescriptor* file,
   // can only be successfully parsed after we register corresponding
   // extensions. Therefore we parse all options again here to recognize
   // custom options that may be unknown when we define the descriptors.
+  // This does not apply to services because they are not used by extensions.
   FixAllDescriptorOptions();
+  PrintServiceDescriptors();
   if (HasGenericServices(file)) {
     PrintServices();
   }
@@ -410,11 +414,13 @@ void Generator::PrintFileDescriptor() const {
   m["name"] = file_->name();
   m["package"] = file_->package();
   m["syntax"] = StringifySyntax(file_->syntax());
+  m["options"] = OptionsValue(file_->options().SerializeAsString());
   const char file_descriptor_template[] =
       "$descriptor_name$ = _descriptor.FileDescriptor(\n"
       "  name='$name$',\n"
       "  package='$package$',\n"
-      "  syntax='$syntax$',\n";
+      "  syntax='$syntax$',\n"
+      "  serialized_options=$options$,\n";
   printer_->Print(m, file_descriptor_template);
   printer_->Indent();
   printer_->Print(
@@ -445,8 +451,6 @@ void Generator::PrintFileDescriptor() const {
 
   printer_->Outdent();
   printer_->Print(")\n");
-  printer_->Print("_sym_db.RegisterFileDescriptor($name$)\n", "name",
-                  kDescriptorKey);
   printer_->Print("\n");
 }
 
@@ -516,9 +520,9 @@ void Generator::PrintEnum(const EnumDescriptor& enum_descriptor) const {
   printer_->Outdent();
   printer_->Print("],\n");
   printer_->Print("containing_type=None,\n");
-  printer_->Print("options=$options_value$,\n",
+  printer_->Print("serialized_options=$options_value$,\n",
                   "options_value",
-                  OptionsValue("EnumOptions", options_string));
+                  OptionsValue(options_string));
   EnumDescriptorProto edp;
   PrintSerializedPbInterval(enum_descriptor, edp);
   printer_->Outdent();
@@ -564,9 +568,16 @@ void Generator::PrintMessageDescriptors() const {
   }
 }
 
-void Generator::PrintServices() const {
+void Generator::PrintServiceDescriptors() const {
   for (int i = 0; i < file_->service_count(); ++i) {
     PrintServiceDescriptor(*file_->service(i));
+    AddServiceToFileDescriptor(*file_->service(i));
+    printer_->Print("\n");
+  }
+}
+
+void Generator::PrintServices() const {
+  for (int i = 0; i < file_->service_count(); ++i) {
     PrintServiceClass(*file_->service(i));
     PrintServiceStub(*file_->service(i));
     printer_->Print("\n");
@@ -589,13 +600,13 @@ void Generator::PrintServiceDescriptor(
   m["full_name"] = descriptor.full_name();
   m["file"] = kDescriptorKey;
   m["index"] = SimpleItoa(descriptor.index());
-  m["options_value"] = OptionsValue("ServiceOptions", options_string);
+  m["options_value"] = OptionsValue(options_string);
   const char required_function_arguments[] =
       "name='$name$',\n"
       "full_name='$full_name$',\n"
       "file=$file$,\n"
       "index=$index$,\n"
-      "options=$options_value$,\n";
+      "serialized_options=$options_value$,\n";
   printer_->Print(m, required_function_arguments);
 
   ServiceDescriptorProto sdp;
@@ -613,7 +624,7 @@ void Generator::PrintServiceDescriptor(
     m["serialized_options"] = CEscape(options_string);
     m["input_type"] = ModuleLevelDescriptorName(*(method->input_type()));
     m["output_type"] = ModuleLevelDescriptorName(*(method->output_type()));
-    m["options_value"] = OptionsValue("MethodOptions", options_string);
+    m["options_value"] = OptionsValue(options_string);
     printer_->Print("_descriptor.MethodDescriptor(\n");
     printer_->Indent();
     printer_->Print(
@@ -624,13 +635,16 @@ void Generator::PrintServiceDescriptor(
         "containing_service=None,\n"
         "input_type=$input_type$,\n"
         "output_type=$output_type$,\n"
-        "options=$options_value$,\n");
+        "serialized_options=$options_value$,\n");
     printer_->Outdent();
     printer_->Print("),\n");
   }
 
   printer_->Outdent();
-  printer_->Print("])\n\n");
+  printer_->Print("])\n");
+  printer_->Print("_sym_db.RegisterServiceDescriptor($name$)\n", "name",
+                  service_name);
+  printer_->Print("\n");
 }
 
 
@@ -717,10 +731,10 @@ void Generator::PrintDescriptor(const Descriptor& message_descriptor) const {
   string options_string;
   message_descriptor.options().SerializeToString(&options_string);
   printer_->Print(
-      "options=$options_value$,\n"
+      "serialized_options=$options_value$,\n"
       "is_extendable=$extendable$,\n"
       "syntax='$syntax$'",
-      "options_value", OptionsValue("MessageOptions", options_string),
+      "options_value", OptionsValue(options_string),
       "extendable", message_descriptor.extension_range_count() > 0 ?
                       "True" : "False",
       "syntax", StringifySyntax(message_descriptor.file()->syntax()));
@@ -745,17 +759,18 @@ void Generator::PrintDescriptor(const Descriptor& message_descriptor) const {
     m["full_name"] = desc->full_name();
     m["index"] = SimpleItoa(desc->index());
     string options_string =
-        OptionsValue("OneofOptions", desc->options().SerializeAsString());
+        OptionsValue(desc->options().SerializeAsString());
     if (options_string == "None") {
-      m["options"] = "";
+      m["serialized_options"] = "";
     } else {
-      m["options"] = ", options=" + options_string;
+      m["serialized_options"] = ", serialized_options=" + options_string;
     }
     printer_->Print(
         m,
         "_descriptor.OneofDescriptor(\n"
         "  name='$name$', full_name='$full_name$',\n"
-        "  index=$index$, containing_type=None, fields=[]$options$),\n");
+        "  index=$index$, containing_type=None, "
+        "fields=[]$serialized_options$),\n");
   }
   printer_->Outdent();
   printer_->Print("],\n");
@@ -889,6 +904,18 @@ void Generator::AddMessageToFileDescriptor(const Descriptor& descriptor) const {
   printer_->Print(m, file_descriptor_template);
 }
 
+void Generator::AddServiceToFileDescriptor(
+    const ServiceDescriptor& descriptor) const {
+  std::map<string, string> m;
+  m["descriptor_name"] = kDescriptorKey;
+  m["service_name"] = descriptor.name();
+  m["service_descriptor_name"] = ModuleLevelServiceDescriptorName(descriptor);
+  const char file_descriptor_template[] =
+      "$descriptor_name$.services_by_name['$service_name$'] = "
+      "$service_descriptor_name$\n";
+  printer_->Print(m, file_descriptor_template);
+}
+
 void Generator::AddEnumToFileDescriptor(
     const EnumDescriptor& descriptor) const {
   std::map<string, string> m;
@@ -999,6 +1026,10 @@ void Generator::FixForeignFieldsInDescriptors() const {
   for (int i = 0; i < file_->extension_count(); ++i) {
     AddExtensionToFileDescriptor(*file_->extension(i));
   }
+  // TODO(jieluo): Move this register to PrintFileDescriptor() when
+  // FieldDescriptor.file is added in generated file.
+  printer_->Print("_sym_db.RegisterFileDescriptor($name$)\n", "name",
+                  kDescriptorKey);
   printer_->Print("\n");
 }
 
@@ -1062,27 +1093,22 @@ void Generator::PrintEnumValueDescriptor(
   m["name"] = descriptor.name();
   m["index"] = SimpleItoa(descriptor.index());
   m["number"] = SimpleItoa(descriptor.number());
-  m["options"] = OptionsValue("EnumValueOptions", options_string);
+  m["options"] = OptionsValue(options_string);
   printer_->Print(
       m,
       "_descriptor.EnumValueDescriptor(\n"
       "  name='$name$', index=$index$, number=$number$,\n"
-      "  options=$options$,\n"
+      "  serialized_options=$options$,\n"
       "  type=None)");
 }
 
-// Returns a Python expression that calls descriptor._ParseOptions using
-// the given descriptor class name and serialized options protobuf string.
-string Generator::OptionsValue(
-    const string& class_name, const string& serialized_options) const {
+// Returns a CEscaped string of serialized_options.
+string Generator::OptionsValue(const string& serialized_options) const {
   if (serialized_options.length() == 0 || GeneratingDescriptorProto()) {
     return "None";
   } else {
-    string full_class_name = "descriptor_pb2." + class_name;
-//##!PY25    return "_descriptor._ParseOptions(" + full_class_name + "(), b'"
-//##!PY25        + CEscape(serialized_options)+ "')";
-    return "_descriptor._ParseOptions(" + full_class_name + "(), _b('"  //##PY25
-        + CEscape(serialized_options)+ "'))";  //##PY25
+//##!PY25    return "b'('" + CEscape(serialized_options)+ "')";
+    return "_b('"+ CEscape(serialized_options) + "')";  //##PY25
   }
 }
 
@@ -1102,7 +1128,7 @@ void Generator::PrintFieldDescriptor(
   m["has_default_value"] = field.has_default_value() ? "True" : "False";
   m["default_value"] = StringifyDefaultValue(field);
   m["is_extension"] = is_extension ? "True" : "False";
-  m["options"] = OptionsValue("FieldOptions", options_string);
+  m["serialized_options"] = OptionsValue(options_string);
   m["json_name"] = field.has_json_name() ?
       ", json_name='" + field.json_name() + "'": "";
   // We always set message_type and enum_type to None at this point, and then
@@ -1115,7 +1141,7 @@ void Generator::PrintFieldDescriptor(
     "  has_default_value=$has_default_value$, default_value=$default_value$,\n"
     "  message_type=None, enum_type=None, containing_type=None,\n"
     "  is_extension=$is_extension$, extension_scope=None,\n"
-    "  options=$options$$json_name$)";
+    "  serialized_options=$serialized_options$$json_name$, file=DESCRIPTOR)";
   printer_->Print(m, field_descriptor_decl);
 }
 
@@ -1244,23 +1270,18 @@ namespace {
 void PrintDescriptorOptionsFixingCode(const string& descriptor,
                                       const string& options,
                                       io::Printer* printer) {
-  // TODO(xiaofeng): I have added a method _SetOptions() to DescriptorBase
-  // in proto2 python runtime but it couldn't be used here because appengine
-  // uses a snapshot version of the library in which the new method is not
-  // yet present. After appengine has synced their runtime library, the code
-  // below should be cleaned up to use _SetOptions().
+  // Reset the _options to None thus DescriptorBase.GetOptions() can
+  // parse _options again after extensions are registered.
   printer->Print(
-      "$descriptor$.has_options = True\n"
-      "$descriptor$._options = $options$\n",
-      "descriptor", descriptor, "options", options);
+      "$descriptor$._options = None\n",
+      "descriptor", descriptor);
 }
 }  // namespace
 
 // Prints expressions that set the options field of all descriptors.
 void Generator::FixAllDescriptorOptions() const {
   // Prints an expression that sets the file descriptor's options.
-  string file_options = OptionsValue(
-      "FileOptions", file_->options().SerializeAsString());
+  string file_options = OptionsValue(file_->options().SerializeAsString());
   if (file_options != "None") {
     PrintDescriptorOptionsFixingCode(kDescriptorKey, file_options, printer_);
   }
@@ -1282,8 +1303,7 @@ void Generator::FixAllDescriptorOptions() const {
 }
 
 void Generator::FixOptionsForOneof(const OneofDescriptor& oneof) const {
-  string oneof_options = OptionsValue(
-      "OneofOptions", oneof.options().SerializeAsString());
+  string oneof_options = OptionsValue(oneof.options().SerializeAsString());
   if (oneof_options != "None") {
     string oneof_name = strings::Substitute(
         "$0.$1['$2']",
@@ -1298,14 +1318,14 @@ void Generator::FixOptionsForOneof(const OneofDescriptor& oneof) const {
 void Generator::FixOptionsForEnum(const EnumDescriptor& enum_descriptor) const {
   string descriptor_name = ModuleLevelDescriptorName(enum_descriptor);
   string enum_options = OptionsValue(
-      "EnumOptions", enum_descriptor.options().SerializeAsString());
+      enum_descriptor.options().SerializeAsString());
   if (enum_options != "None") {
     PrintDescriptorOptionsFixingCode(descriptor_name, enum_options, printer_);
   }
   for (int i = 0; i < enum_descriptor.value_count(); ++i) {
     const EnumValueDescriptor& value_descriptor = *enum_descriptor.value(i);
     string value_options = OptionsValue(
-        "EnumValueOptions", value_descriptor.options().SerializeAsString());
+        value_descriptor.options().SerializeAsString());
     if (value_options != "None") {
       PrintDescriptorOptionsFixingCode(
           StringPrintf("%s.values_by_name[\"%s\"]", descriptor_name.c_str(),
@@ -1319,8 +1339,7 @@ void Generator::FixOptionsForEnum(const EnumDescriptor& enum_descriptor) const {
 // extensions).
 void Generator::FixOptionsForField(
     const FieldDescriptor& field) const {
-  string field_options = OptionsValue(
-      "FieldOptions", field.options().SerializeAsString());
+  string field_options = OptionsValue(field.options().SerializeAsString());
   if (field_options != "None") {
     string field_name;
     if (field.is_extension()) {
@@ -1366,7 +1385,7 @@ void Generator::FixOptionsForMessage(const Descriptor& descriptor) const {
   }
   // Message option for this message.
   string message_options = OptionsValue(
-      "MessageOptions", descriptor.options().SerializeAsString());
+      descriptor.options().SerializeAsString());
   if (message_options != "None") {
     string descriptor_name = ModuleLevelDescriptorName(descriptor);
     PrintDescriptorOptionsFixingCode(descriptor_name,
diff --git a/src/google/protobuf/compiler/python/python_generator.h b/src/google/protobuf/compiler/python/python_generator.h
index 594260af..8e4050de 100644
--- a/src/google/protobuf/compiler/python/python_generator.h
+++ b/src/google/protobuf/compiler/python/python_generator.h
@@ -112,6 +112,7 @@ class LIBPROTOC_EXPORT Generator : public CodeGenerator {
   void AddMessageToFileDescriptor(const Descriptor& descriptor) const;
   void AddEnumToFileDescriptor(const EnumDescriptor& descriptor) const;
   void AddExtensionToFileDescriptor(const FieldDescriptor& descriptor) const;
+  void AddServiceToFileDescriptor(const ServiceDescriptor& descriptor) const;
   string FieldReferencingExpression(const Descriptor* containing_type,
                                     const FieldDescriptor& field,
                                     const string& python_dict_name) const;
@@ -126,15 +127,15 @@ class LIBPROTOC_EXPORT Generator : public CodeGenerator {
   void FixForeignFieldsInNestedExtensions(const Descriptor& descriptor) const;
 
   void PrintServices() const;
+  void PrintServiceDescriptors() const;
   void PrintServiceDescriptor(const ServiceDescriptor& descriptor) const;
   void PrintServiceClass(const ServiceDescriptor& descriptor) const;
   void PrintServiceStub(const ServiceDescriptor& descriptor) const;
   void PrintDescriptorKeyAndModuleName(
-      const ServiceDescriptor& descriptor) const ;
+      const ServiceDescriptor& descriptor) const;
 
   void PrintEnumValueDescriptor(const EnumValueDescriptor& descriptor) const;
-  string OptionsValue(const string& class_name,
-                      const string& serialized_options) const;
+  string OptionsValue(const string& serialized_options) const;
   bool GeneratingDescriptorProto() const;
 
   template <typename DescriptorT>
diff --git a/src/google/protobuf/compiler/python/python_plugin_unittest.cc b/src/google/protobuf/compiler/python/python_plugin_unittest.cc
index 34f857fd..2f096808 100644
--- a/src/google/protobuf/compiler/python/python_plugin_unittest.cc
+++ b/src/google/protobuf/compiler/python/python_plugin_unittest.cc
@@ -35,9 +35,6 @@
 //   worth.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/compiler/python/python_generator.h>
 #include <google/protobuf/compiler/command_line_interface.h>
@@ -74,7 +71,7 @@ class TestGenerator : public CodeGenerator {
 
   void TryInsert(const string& filename, const string& insertion_point,
                  GeneratorContext* context) const {
-    google::protobuf::scoped_ptr<io::ZeroCopyOutputStream> output(
+    std::unique_ptr<io::ZeroCopyOutputStream> output(
         context->OpenForInsert(filename, insertion_point));
     io::Printer printer(output.get(), '$');
     printer.Print("// inserted $name$\n", "name", insertion_point);
diff --git a/src/google/protobuf/compiler/ruby/ruby_generator.cc b/src/google/protobuf/compiler/ruby/ruby_generator.cc
index fbe3b4cb..bd737c02 100644
--- a/src/google/protobuf/compiler/ruby/ruby_generator.cc
+++ b/src/google/protobuf/compiler/ruby/ruby_generator.cc
@@ -39,8 +39,6 @@
 
 #include <google/protobuf/compiler/ruby/ruby_generator.h>
 
-using google::protobuf::internal::scoped_ptr;
-
 namespace google {
 namespace protobuf {
 namespace compiler {
@@ -339,9 +337,20 @@ void GenerateEnumAssignment(
 }
 
 int GeneratePackageModules(
-    std::string package_name,
+    const FileDescriptor* file,
     google::protobuf::io::Printer* printer) {
   int levels = 0;
+  bool need_change_to_module;
+  std::string package_name;
+
+  if (file->options().has_ruby_package()) {
+    package_name = file->options().ruby_package();
+    need_change_to_module = false;
+  } else {
+    package_name = file->package();
+    need_change_to_module = true;
+  }
+
   while (!package_name.empty()) {
     size_t dot_index = package_name.find(".");
     string component;
@@ -352,7 +361,9 @@ int GeneratePackageModules(
       component = package_name.substr(0, dot_index);
       package_name = package_name.substr(dot_index + 1);
     }
-    component = PackageToModule(component);
+    if (need_change_to_module) {
+      component = PackageToModule(component);
+    }
     printer->Print(
       "module $name$\n",
       "name", component);
@@ -464,7 +475,7 @@ bool GenerateFile(const FileDescriptor* file, io::Printer* printer,
   printer->Print(
     "end\n\n");
 
-  int levels = GeneratePackageModules(file->package(), printer);
+  int levels = GeneratePackageModules(file, printer);
   for (int i = 0; i < file->message_type_count(); i++) {
     GenerateMessageAssignment("", file->message_type(i), printer);
   }
@@ -488,7 +499,7 @@ bool Generator::Generate(
     return false;
   }
 
-  scoped_ptr<io::ZeroCopyOutputStream> output(
+  std::unique_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(GetOutputFilename(file->name())));
   io::Printer printer(output.get(), '$');
 
diff --git a/src/google/protobuf/compiler/subprocess.cc b/src/google/protobuf/compiler/subprocess.cc
index 933450fa..2e5a89ac 100644
--- a/src/google/protobuf/compiler/subprocess.cc
+++ b/src/google/protobuf/compiler/subprocess.cc
@@ -33,6 +33,7 @@
 #include <google/protobuf/compiler/subprocess.h>
 
 #include <algorithm>
+#include <cstring>
 #include <iostream>
 
 #ifndef _WIN32
@@ -47,11 +48,20 @@
 #include <google/protobuf/message.h>
 #include <google/protobuf/stubs/substitute.h>
 
-
 namespace google {
 namespace protobuf {
 namespace compiler {
 
+namespace {
+char* portable_strdup(const char* s) {
+  char* ns = (char*) malloc(strlen(s) + 1);
+  if (ns != NULL) {
+    strcpy(ns, s);
+  }
+  return ns;
+}
+}  // namespace
+
 #ifdef _WIN32
 
 static void CloseHandleOrDie(HANDLE handle) {
@@ -115,7 +125,7 @@ void Subprocess::Start(const string& program, SearchMode search_mode) {
   }
 
   // CreateProcess() mutates its second parameter.  WTF?
-  char* name_copy = strdup(program.c_str());
+  char* name_copy = portable_strdup(program.c_str());
 
   // Create the process.
   PROCESS_INFORMATION process_info;
@@ -299,7 +309,7 @@ void Subprocess::Start(const string& program, SearchMode search_mode) {
   GOOGLE_CHECK(pipe(stdin_pipe) != -1);
   GOOGLE_CHECK(pipe(stdout_pipe) != -1);
 
-  char* argv[2] = { strdup(program.c_str()), NULL };
+  char* argv[2] = { portable_strdup(program.c_str()), NULL };
 
   child_pid_ = fork();
   if (child_pid_ == -1) {
@@ -347,7 +357,6 @@ void Subprocess::Start(const string& program, SearchMode search_mode) {
 
 bool Subprocess::Communicate(const Message& input, Message* output,
                              string* error) {
-
   GOOGLE_CHECK_NE(child_stdin_, -1) << "Must call Start() first.";
 
   // The "sighandler_t" typedef is GNU-specific, so define our own.
diff --git a/src/google/protobuf/compiler/subprocess.h b/src/google/protobuf/compiler/subprocess.h
index 25138631..9d980b06 100644
--- a/src/google/protobuf/compiler/subprocess.h
+++ b/src/google/protobuf/compiler/subprocess.h
@@ -44,7 +44,6 @@
 
 #include <string>
 
-
 namespace google {
 namespace protobuf {
 
diff --git a/src/google/protobuf/compiler/test_plugin.cc b/src/google/protobuf/compiler/test_plugin.cc
index 4830fd70..c676ce8c 100644
--- a/src/google/protobuf/compiler/test_plugin.cc
+++ b/src/google/protobuf/compiler/test_plugin.cc
@@ -37,7 +37,6 @@
 #include <stdlib.h>
 #include <google/protobuf/compiler/plugin.h>
 #include <google/protobuf/compiler/mock_code_generator.h>
-#include <google/protobuf/stubs/strutil.h>
 
 int main(int argc, char* argv[]) {
 #ifdef _MSC_VER
diff --git a/src/google/protobuf/compiler/zip_output_unittest.sh b/src/google/protobuf/compiler/zip_output_unittest.sh
index 6fc7136d..f8597912 100755
--- a/src/google/protobuf/compiler/zip_output_unittest.sh
+++ b/src/google/protobuf/compiler/zip_output_unittest.sh
@@ -41,6 +41,8 @@ fail() {
 
 TEST_TMPDIR=.
 PROTOC=./protoc
+JAR=jar
+UNZIP=unzip
 
 echo '
   syntax = "proto2";
@@ -57,8 +59,9 @@ $PROTOC \
     || fail 'protoc failed.'
 
 echo "Testing output to zip..."
-if unzip -h > /dev/null; then
-  unzip -t $TEST_TMPDIR/testzip.zip > $TEST_TMPDIR/testzip.list || fail 'unzip failed.'
+if $UNZIP -h > /dev/null; then
+  $UNZIP -t $TEST_TMPDIR/testzip.zip > $TEST_TMPDIR/testzip.list \
+    || fail 'unzip failed.'
 
   grep 'testing: testzip\.pb\.cc *OK$' $TEST_TMPDIR/testzip.list > /dev/null \
     || fail 'testzip.pb.cc not found in output zip.'
@@ -73,8 +76,14 @@ else
 fi
 
 echo "Testing output to jar..."
-if jar c $TEST_TMPDIR/testzip.proto > /dev/null; then
-  jar tf $TEST_TMPDIR/testzip.jar > $TEST_TMPDIR/testzip.list || fail 'jar failed.'
+if $JAR c $TEST_TMPDIR/testzip.proto > /dev/null; then
+  $JAR tf $TEST_TMPDIR/testzip.jar > $TEST_TMPDIR/testzip.list \
+    || fail 'jar failed.'
+
+  # Check that -interface.jar timestamps are normalized:
+  if [[ "$(TZ=UTC $JAR tvf $TEST_TMPDIR/testzip.jar)" != *'Tue Jan 01 00:00:00 UTC 1980'* ]]; then
+    fail 'Zip did not contain normalized timestamps'
+  fi
 
   grep '^test/jar/Foo\.java$' $TEST_TMPDIR/testzip.list > /dev/null \
     || fail 'Foo.java not found in output jar.'
diff --git a/src/google/protobuf/compiler/zip_writer.cc b/src/google/protobuf/compiler/zip_writer.cc
index 458cced2..1799af6a 100644
--- a/src/google/protobuf/compiler/zip_writer.cc
+++ b/src/google/protobuf/compiler/zip_writer.cc
@@ -70,6 +70,10 @@ namespace google {
 namespace protobuf {
 namespace compiler {
 
+// January 1, 1980 as a DOS date.
+// see https://msdn.microsoft.com/en-us/library/9kkf9tah.aspx
+static const uint16 kDosEpoch = 1 << 5 | 1;
+
 static const uint32 kCRC32Table[256] = {
   0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
   0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
@@ -154,7 +158,7 @@ bool ZipWriter::Write(const string& filename, const string& contents) {
   WriteShort(&output, 0);  // flags
   WriteShort(&output, 0);  // compression method: stored
   WriteShort(&output, 0);  // last modified time
-  WriteShort(&output, 0);  // last modified date
+  WriteShort(&output, kDosEpoch);  // last modified date
   output.WriteLittleEndian32(info.crc32);  // crc-32
   output.WriteLittleEndian32(info.size);  // compressed size
   output.WriteLittleEndian32(info.size);  // uncompressed size
@@ -185,7 +189,7 @@ bool ZipWriter::WriteDirectory() {
     WriteShort(&output, 0);  // flags
     WriteShort(&output, 0);  // compression method: stored
     WriteShort(&output, 0);  // last modified time
-    WriteShort(&output, 0);  // last modified date
+    WriteShort(&output, kDosEpoch);  // last modified date
     output.WriteLittleEndian32(crc32);  // crc-32
     output.WriteLittleEndian32(size);  // compressed size
     output.WriteLittleEndian32(size);  // uncompressed size
diff --git a/src/google/protobuf/descriptor.cc b/src/google/protobuf/descriptor.cc
index c87327ce..dae24f9e 100644
--- a/src/google/protobuf/descriptor.cc
+++ b/src/google/protobuf/descriptor.cc
@@ -32,37 +32,38 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
+#include <algorithm>
+#include <functional>
 #include <google/protobuf/stubs/hash.h>
+#include <limits>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
 #include <string>
 #include <vector>
-#include <algorithm>
-#include <limits>
 
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/mutex.h>
+#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/io/strtod.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/tokenizer.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/descriptor_database.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/dynamic_message.h>
 #include <google/protobuf/generated_message_util.h>
 #include <google/protobuf/text_format.h>
 #include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/io/strtod.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/tokenizer.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/mutex.h>
-#include <google/protobuf/stubs/once.h>
-#include <google/protobuf/stubs/stringprintf.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
+
+
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/stl_util.h>
 
@@ -72,6 +73,79 @@ namespace google {
 
 namespace protobuf {
 
+struct Symbol {
+  enum Type {
+    NULL_SYMBOL,
+    MESSAGE,
+    FIELD,
+    ONEOF,
+    ENUM,
+    ENUM_VALUE,
+    SERVICE,
+    METHOD,
+    PACKAGE
+  };
+  Type type;
+  union {
+    const Descriptor* descriptor;
+    const FieldDescriptor* field_descriptor;
+    const OneofDescriptor* oneof_descriptor;
+    const EnumDescriptor* enum_descriptor;
+    const EnumValueDescriptor* enum_value_descriptor;
+    const ServiceDescriptor* service_descriptor;
+    const MethodDescriptor* method_descriptor;
+    const FileDescriptor* package_file_descriptor;
+  };
+
+  inline Symbol() : type(NULL_SYMBOL) { descriptor = NULL; }
+  inline bool IsNull() const { return type == NULL_SYMBOL; }
+  inline bool IsType() const { return type == MESSAGE || type == ENUM; }
+  inline bool IsAggregate() const {
+    return type == MESSAGE || type == PACKAGE || type == ENUM ||
+           type == SERVICE;
+  }
+
+#define CONSTRUCTOR(TYPE, TYPE_CONSTANT, FIELD) \
+  inline explicit Symbol(const TYPE* value) {   \
+    type = TYPE_CONSTANT;                       \
+    this->FIELD = value;                        \
+  }
+
+  CONSTRUCTOR(Descriptor, MESSAGE, descriptor)
+  CONSTRUCTOR(FieldDescriptor, FIELD, field_descriptor)
+  CONSTRUCTOR(OneofDescriptor, ONEOF, oneof_descriptor)
+  CONSTRUCTOR(EnumDescriptor, ENUM, enum_descriptor)
+  CONSTRUCTOR(EnumValueDescriptor, ENUM_VALUE, enum_value_descriptor)
+  CONSTRUCTOR(ServiceDescriptor, SERVICE, service_descriptor)
+  CONSTRUCTOR(MethodDescriptor, METHOD, method_descriptor)
+  CONSTRUCTOR(FileDescriptor, PACKAGE, package_file_descriptor)
+#undef CONSTRUCTOR
+
+  const FileDescriptor* GetFile() const {
+    switch (type) {
+      case NULL_SYMBOL:
+        return NULL;
+      case MESSAGE:
+        return descriptor->file();
+      case FIELD:
+        return field_descriptor->file();
+      case ONEOF:
+        return oneof_descriptor->containing_type()->file();
+      case ENUM:
+        return enum_descriptor->file();
+      case ENUM_VALUE:
+        return enum_value_descriptor->type()->file();
+      case SERVICE:
+        return service_descriptor->file();
+      case METHOD:
+        return method_descriptor->service()->file();
+      case PACKAGE:
+        return package_file_descriptor;
+    }
+    return NULL;
+  }
+};
+
 const FieldDescriptor::CppType
 FieldDescriptor::kTypeToCppTypeMap[MAX_TYPE + 1] = {
   static_cast<CppType>(0),  // 0 is reserved for errors
@@ -272,14 +346,14 @@ class PrefixRemover {
       }
 
       if (ascii_tolower(str[i]) != prefix_[j++]) {
-        return str.as_string();
+        return string(str);
       }
     }
 
     // If we didn't make it through the prefix, we've failed to strip the
     // prefix.
     if (j < prefix_.size()) {
-      return str.as_string();
+      return string(str);
     }
 
     // Skip underscores between prefix and further characters.
@@ -289,27 +363,25 @@ class PrefixRemover {
 
     // Enum label can't be the empty string.
     if (i == str.size()) {
-      return str.as_string();
+      return string(str);
     }
 
     // We successfully stripped the prefix.
     str.remove_prefix(i);
-    return str.as_string();
+    return string(str);
   }
 
  private:
   string prefix_;
 };
 
-// A DescriptorPool contains a bunch of hash_maps to implement the
+// A DescriptorPool contains a bunch of hash-maps to implement the
 // various Find*By*() methods.  Since hashtable lookups are O(1), it's
-// most efficient to construct a fixed set of large hash_maps used by
+// most efficient to construct a fixed set of large hash-maps used by
 // all objects in the pool rather than construct one or more small
-// hash_maps for each object.
+// hash-maps for each object.
 //
-// The keys to these hash_maps are (parent, name) or (parent, number)
-// pairs.  Unfortunately STL doesn't provide hash functions for pair<>,
-// so we must invent our own.
+// The keys to these hash-maps are (parent, name) or (parent, number) pairs.
 //
 // TODO(kenton):  Use StringPiece rather than const char* in keys?  It would
 //   be a lot cleaner but we'd just have to convert it back to const char*
@@ -324,12 +396,20 @@ struct PointerStringPairEqual {
   }
 };
 
+typedef std::pair<const Descriptor*, int> DescriptorIntPair;
+typedef std::pair<const EnumDescriptor*, int> EnumIntPair;
+
+#define HASH_MAP hash_map
+#define HASH_SET hash_set
+#define HASH_FXN hash
+
 template<typename PairType>
 struct PointerIntegerPairHash {
   size_t operator()(const PairType& p) const {
-    // FIXME(kenton):  What is the best way to compute this hash?  I have
-    // no idea!  This seems a bit better than an XOR.
-    return reinterpret_cast<intptr_t>(p.first) * ((1 << 16) - 1) + p.second;
+    static const size_t prime1 = 16777499;
+    static const size_t prime2 = 16777619;
+    return reinterpret_cast<size_t>(p.first) * prime1 ^
+           static_cast<size_t>(p.second) * prime2;
   }
 
 #ifdef _MSC_VER
@@ -343,16 +423,12 @@ struct PointerIntegerPairHash {
   }
 };
 
-typedef std::pair<const Descriptor*, int> DescriptorIntPair;
-typedef std::pair<const EnumDescriptor*, int> EnumIntPair;
-
 struct PointerStringPairHash {
   size_t operator()(const PointerStringPair& p) const {
-    // FIXME(kenton):  What is the best way to compute this hash?  I have
-    // no idea!  This seems a bit better than an XOR.
+    static const size_t prime = 16777619;
     hash<const char*> cstring_hash;
-    return reinterpret_cast<intptr_t>(p.first) * ((1 << 16) - 1) +
-           cstring_hash(p.second);
+    return reinterpret_cast<size_t>(p.first) * prime ^
+           static_cast<size_t>(cstring_hash(p.second));
   }
 
 #ifdef _MSC_VER
@@ -369,92 +445,39 @@ struct PointerStringPairHash {
 };
 
 
-struct Symbol {
-  enum Type {
-    NULL_SYMBOL, MESSAGE, FIELD, ONEOF, ENUM, ENUM_VALUE, SERVICE, METHOD,
-    PACKAGE
-  };
-  Type type;
-  union {
-    const Descriptor* descriptor;
-    const FieldDescriptor* field_descriptor;
-    const OneofDescriptor* oneof_descriptor;
-    const EnumDescriptor* enum_descriptor;
-    const EnumValueDescriptor* enum_value_descriptor;
-    const ServiceDescriptor* service_descriptor;
-    const MethodDescriptor* method_descriptor;
-    const FileDescriptor* package_file_descriptor;
-  };
+const Symbol kNullSymbol;
 
-  inline Symbol() : type(NULL_SYMBOL) { descriptor = NULL; }
-  inline bool IsNull() const { return type == NULL_SYMBOL; }
-  inline bool IsType() const {
-    return type == MESSAGE || type == ENUM;
-  }
-  inline bool IsAggregate() const {
-    return type == MESSAGE || type == PACKAGE
-        || type == ENUM || type == SERVICE;
-  }
+typedef HASH_MAP<const char*, Symbol, HASH_FXN<const char*>, streq>
+    SymbolsByNameMap;
 
-#define CONSTRUCTOR(TYPE, TYPE_CONSTANT, FIELD)  \
-  inline explicit Symbol(const TYPE* value) {    \
-    type = TYPE_CONSTANT;                        \
-    this->FIELD = value;                         \
-  }
+typedef HASH_MAP<PointerStringPair, Symbol, PointerStringPairHash,
+                 PointerStringPairEqual>
+    SymbolsByParentMap;
 
-  CONSTRUCTOR(Descriptor         , MESSAGE   , descriptor             )
-  CONSTRUCTOR(FieldDescriptor    , FIELD     , field_descriptor       )
-  CONSTRUCTOR(OneofDescriptor    , ONEOF     , oneof_descriptor       )
-  CONSTRUCTOR(EnumDescriptor     , ENUM      , enum_descriptor        )
-  CONSTRUCTOR(EnumValueDescriptor, ENUM_VALUE, enum_value_descriptor  )
-  CONSTRUCTOR(ServiceDescriptor  , SERVICE   , service_descriptor     )
-  CONSTRUCTOR(MethodDescriptor   , METHOD    , method_descriptor      )
-  CONSTRUCTOR(FileDescriptor     , PACKAGE   , package_file_descriptor)
-#undef CONSTRUCTOR
+typedef HASH_MAP<const char*, const FileDescriptor*, HASH_FXN<const char*>,
+                 streq>
+    FilesByNameMap;
 
-  const FileDescriptor* GetFile() const {
-    switch (type) {
-      case NULL_SYMBOL: return NULL;
-      case MESSAGE    : return descriptor           ->file();
-      case FIELD      : return field_descriptor     ->file();
-      case ONEOF      : return oneof_descriptor     ->containing_type()->file();
-      case ENUM       : return enum_descriptor      ->file();
-      case ENUM_VALUE : return enum_value_descriptor->type()->file();
-      case SERVICE    : return service_descriptor   ->file();
-      case METHOD     : return method_descriptor    ->service()->file();
-      case PACKAGE    : return package_file_descriptor;
-    }
-    return NULL;
-  }
-};
-
-const Symbol kNullSymbol;
-
-typedef hash_map<const char*, Symbol,
-                 hash<const char*>, streq>
-  SymbolsByNameMap;
-typedef hash_map<PointerStringPair, Symbol,
+typedef HASH_MAP<PointerStringPair, const FieldDescriptor*,
                  PointerStringPairHash, PointerStringPairEqual>
-  SymbolsByParentMap;
-typedef hash_map<const char*, const FileDescriptor*,
-                 hash<const char*>, streq>
-  FilesByNameMap;
-typedef hash_map<PointerStringPair, const FieldDescriptor*,
-                 PointerStringPairHash, PointerStringPairEqual>
-  FieldsByNameMap;
-typedef hash_map<DescriptorIntPair, const FieldDescriptor*,
-                 PointerIntegerPairHash<DescriptorIntPair> >
-  FieldsByNumberMap;
-typedef hash_map<EnumIntPair, const EnumValueDescriptor*,
-                 PointerIntegerPairHash<EnumIntPair> >
-  EnumValuesByNumberMap;
-// This is a map rather than a hash_map, since we use it to iterate
+    FieldsByNameMap;
+
+typedef HASH_MAP<DescriptorIntPair, const FieldDescriptor*,
+                 PointerIntegerPairHash<DescriptorIntPair>,
+                 std::equal_to<DescriptorIntPair> >
+    FieldsByNumberMap;
+
+typedef HASH_MAP<EnumIntPair, const EnumValueDescriptor*,
+                 PointerIntegerPairHash<EnumIntPair>,
+                 std::equal_to<EnumIntPair> >
+    EnumValuesByNumberMap;
+// This is a map rather than a hash-map, since we use it to iterate
 // through all the extensions that extend a given Descriptor, and an
 // ordered data structure that implements lower_bound is convenient
 // for that.
 typedef std::map<DescriptorIntPair, const FieldDescriptor*>
   ExtensionsGroupedByDescriptorMap;
-typedef hash_map<string, const SourceCodeInfo_Location*> LocationsByPathMap;
+typedef HASH_MAP<string, const SourceCodeInfo_Location*> LocationsByPathMap;
 
 std::set<string>* allowed_proto3_extendees_ = NULL;
 GOOGLE_PROTOBUF_DECLARE_ONCE(allowed_proto3_extendees_init_);
@@ -549,17 +572,17 @@ class DescriptorPool::Tables {
   // execution of the current public API call, but for compatibility with
   // legacy clients, this is cleared at the beginning of each public API call.
   // Not used when fallback_database_ == NULL.
-  hash_set<string> known_bad_files_;
+  HASH_SET<string> known_bad_files_;
 
   // A set of symbols which we have tried to load from the fallback database
   // and encountered errors. We will not attempt to load them again during
   // execution of the current public API call, but for compatibility with
   // legacy clients, this is cleared at the beginning of each public API call.
-  hash_set<string> known_bad_symbols_;
+  HASH_SET<string> known_bad_symbols_;
 
   // The set of descriptors for which we've already loaded the full
   // set of extensions numbers from fallback_database_.
-  hash_set<const Descriptor*> extensions_loaded_from_db_;
+  HASH_SET<const Descriptor*> extensions_loaded_from_db_;
 
   // -----------------------------------------------------------------
   // Finding items.
@@ -578,7 +601,7 @@ class DescriptorPool::Tables {
   // These return NULL if not found.
   inline const FileDescriptor* FindFile(const string& key) const;
   inline const FieldDescriptor* FindExtension(const Descriptor* extendee,
-                                              int number);
+                                              int number) const;
   inline void FindAllExtensions(const Descriptor* extendee,
                                 std::vector<const FieldDescriptor*>* out) const;
 
@@ -610,6 +633,10 @@ class DescriptorPool::Tables {
   // The string is initialized to the given value for convenience.
   string* AllocateString(const string& value);
 
+  // Allocate a GoogleOnceDynamic which will be destroyed when the pool is
+  // destroyed.
+  GoogleOnceDynamic* AllocateOnceDynamic();
+
   // Allocate a protocol message object.  Some older versions of GCC have
   // trouble understanding explicit template instantiations in some cases, so
   // in those cases we have to pass a dummy pointer of the right type as the
@@ -622,6 +649,8 @@ class DescriptorPool::Tables {
  private:
   std::vector<string*> strings_;    // All strings in the pool.
   std::vector<Message*> messages_;  // All messages in the pool.
+  std::vector<GoogleOnceDynamic*>
+      once_dynamics_;  // All GoogleOnceDynamics in the pool.
   std::vector<FileDescriptorTables*>
       file_tables_;                 // All file tables in the pool.
   std::vector<void*> allocations_;  // All other memory allocated in the pool.
@@ -632,19 +661,20 @@ class DescriptorPool::Tables {
 
   struct CheckPoint {
     explicit CheckPoint(const Tables* tables)
-      : strings_before_checkpoint(tables->strings_.size()),
-        messages_before_checkpoint(tables->messages_.size()),
-        file_tables_before_checkpoint(tables->file_tables_.size()),
-        allocations_before_checkpoint(tables->allocations_.size()),
-        pending_symbols_before_checkpoint(
-            tables->symbols_after_checkpoint_.size()),
-        pending_files_before_checkpoint(
-            tables->files_after_checkpoint_.size()),
-        pending_extensions_before_checkpoint(
-            tables->extensions_after_checkpoint_.size()) {
-    }
+        : strings_before_checkpoint(tables->strings_.size()),
+          messages_before_checkpoint(tables->messages_.size()),
+          once_dynamics_before_checkpoint(tables->once_dynamics_.size()),
+          file_tables_before_checkpoint(tables->file_tables_.size()),
+          allocations_before_checkpoint(tables->allocations_.size()),
+          pending_symbols_before_checkpoint(
+              tables->symbols_after_checkpoint_.size()),
+          pending_files_before_checkpoint(
+              tables->files_after_checkpoint_.size()),
+          pending_extensions_before_checkpoint(
+              tables->extensions_after_checkpoint_.size()) {}
     int strings_before_checkpoint;
     int messages_before_checkpoint;
+    int once_dynamics_before_checkpoint;
     int file_tables_before_checkpoint;
     int allocations_before_checkpoint;
     int pending_symbols_before_checkpoint;
@@ -730,11 +760,27 @@ class FileDescriptorTables {
   const SourceCodeInfo_Location* GetSourceLocation(
       const std::vector<int>& path, const SourceCodeInfo* info) const;
 
+  // Must be called after BuildFileImpl(), even if the build failed and
+  // we are going to roll back to the last checkpoint.
+  void FinalizeTables();
+
  private:
-  SymbolsByParentMap    symbols_by_parent_;
-  FieldsByNameMap       fields_by_lowercase_name_;
-  FieldsByNameMap       fields_by_camelcase_name_;
-  FieldsByNumberMap     fields_by_number_;       // Not including extensions.
+  const void* FindParentForFieldsByMap(const FieldDescriptor* field) const;
+  static void FieldsByLowercaseNamesLazyInitStatic(
+      const FileDescriptorTables* tables);
+  void FieldsByLowercaseNamesLazyInitInternal() const;
+  static void FieldsByCamelcaseNamesLazyInitStatic(
+      const FileDescriptorTables* tables);
+  void FieldsByCamelcaseNamesLazyInitInternal() const;
+
+  SymbolsByParentMap symbols_by_parent_;
+  mutable FieldsByNameMap fields_by_lowercase_name_;
+  mutable FieldsByNameMap* fields_by_lowercase_name_tmp_;
+  mutable GoogleOnceDynamic fields_by_lowercase_name_once_;
+  mutable FieldsByNameMap fields_by_camelcase_name_;
+  mutable FieldsByNameMap* fields_by_camelcase_name_tmp_;
+  mutable GoogleOnceDynamic fields_by_camelcase_name_once_;
+  FieldsByNumberMap fields_by_number_;  // Not including extensions.
   EnumValuesByNumberMap enum_values_by_number_;
   mutable EnumValuesByNumberMap unknown_enum_values_by_number_
       GOOGLE_GUARDED_BY(unknown_enum_values_mu_);
@@ -749,14 +795,13 @@ class FileDescriptorTables {
 };
 
 DescriptorPool::Tables::Tables()
-    // Start some hash_map and hash_set objects with a small # of buckets
+    // Start some hash-map and hash-set objects with a small # of buckets
     : known_bad_files_(3),
       known_bad_symbols_(3),
       extensions_loaded_from_db_(3),
       symbols_by_name_(3),
       files_by_name_(3) {}
 
-
 DescriptorPool::Tables::~Tables() {
   GOOGLE_DCHECK(checkpoints_.empty());
   // Note that the deletion order is important, since the destructors of some
@@ -767,17 +812,20 @@ DescriptorPool::Tables::~Tables() {
   }
   STLDeleteElements(&strings_);
   STLDeleteElements(&file_tables_);
+  STLDeleteElements(&once_dynamics_);
 }
 
 FileDescriptorTables::FileDescriptorTables()
-    // Initialize all the hash tables to start out with a small # of buckets
+    // Initialize all the hash tables to start out with a small # of buckets.
     : symbols_by_parent_(3),
       fields_by_lowercase_name_(3),
+      fields_by_lowercase_name_tmp_(new FieldsByNameMap()),
       fields_by_camelcase_name_(3),
+      fields_by_camelcase_name_tmp_(new FieldsByNameMap()),
       fields_by_number_(3),
       enum_values_by_number_(3),
-      unknown_enum_values_by_number_(3) {
-}
+      unknown_enum_values_by_number_(3),
+      locations_by_path_(3) {}
 
 FileDescriptorTables::~FileDescriptorTables() {}
 
@@ -856,6 +904,9 @@ void DescriptorPool::Tables::RollbackToLastCheckpoint() {
       messages_.begin() + checkpoint.messages_before_checkpoint,
       messages_.end());
   STLDeleteContainerPointers(
+      once_dynamics_.begin() + checkpoint.once_dynamics_before_checkpoint,
+      once_dynamics_.end());
+  STLDeleteContainerPointers(
       file_tables_.begin() + checkpoint.file_tables_before_checkpoint,
       file_tables_.end());
   for (int i = checkpoint.allocations_before_checkpoint;
@@ -866,6 +917,7 @@ void DescriptorPool::Tables::RollbackToLastCheckpoint() {
 
   strings_.resize(checkpoint.strings_before_checkpoint);
   messages_.resize(checkpoint.messages_before_checkpoint);
+  once_dynamics_.resize(checkpoint.once_dynamics_before_checkpoint);
   file_tables_.resize(checkpoint.file_tables_before_checkpoint);
   allocations_.resize(checkpoint.allocations_before_checkpoint);
   checkpoints_.pop_back();
@@ -903,8 +955,10 @@ inline Symbol FileDescriptorTables::FindNestedSymbolOfType(
 Symbol DescriptorPool::Tables::FindByNameHelper(
     const DescriptorPool* pool, const string& name) {
   MutexLockMaybe lock(pool->mutex_);
-  known_bad_symbols_.clear();
-  known_bad_files_.clear();
+  if (pool->fallback_database_ != NULL) {
+    known_bad_symbols_.clear();
+    known_bad_files_.clear();
+  }
   Symbol result = FindSymbol(name);
 
   if (result.IsNull() && pool->underlay_ != NULL) {
@@ -933,14 +987,59 @@ inline const FieldDescriptor* FileDescriptorTables::FindFieldByNumber(
   return FindPtrOrNull(fields_by_number_, std::make_pair(parent, number));
 }
 
+const void* FileDescriptorTables::FindParentForFieldsByMap(
+    const FieldDescriptor* field) const {
+  if (field->is_extension()) {
+    if (field->extension_scope() == NULL) {
+      return field->file();
+    } else {
+      return field->extension_scope();
+    }
+  } else {
+    return field->containing_type();
+  }
+}
+
+void FileDescriptorTables::FieldsByLowercaseNamesLazyInitStatic(
+    const FileDescriptorTables* tables) {
+  tables->FieldsByLowercaseNamesLazyInitInternal();
+}
+
+void FileDescriptorTables::FieldsByLowercaseNamesLazyInitInternal() const {
+  for (FieldsByNumberMap::const_iterator it = fields_by_number_.begin();
+       it != fields_by_number_.end(); it++) {
+    PointerStringPair lowercase_key(FindParentForFieldsByMap(it->second),
+                                    it->second->lowercase_name().c_str());
+    InsertIfNotPresent(&fields_by_lowercase_name_, lowercase_key, it->second);
+  }
+}
+
 inline const FieldDescriptor* FileDescriptorTables::FindFieldByLowercaseName(
     const void* parent, const string& lowercase_name) const {
+  fields_by_lowercase_name_once_.Init(
+      &FileDescriptorTables::FieldsByLowercaseNamesLazyInitStatic, this);
   return FindPtrOrNull(fields_by_lowercase_name_,
                        PointerStringPair(parent, lowercase_name.c_str()));
 }
 
+void FileDescriptorTables::FieldsByCamelcaseNamesLazyInitStatic(
+    const FileDescriptorTables* tables) {
+  tables->FieldsByCamelcaseNamesLazyInitInternal();
+}
+
+void FileDescriptorTables::FieldsByCamelcaseNamesLazyInitInternal() const {
+  for (FieldsByNumberMap::const_iterator it = fields_by_number_.begin();
+       it != fields_by_number_.end(); it++) {
+    PointerStringPair camelcase_key(FindParentForFieldsByMap(it->second),
+                                    it->second->camelcase_name().c_str());
+    InsertIfNotPresent(&fields_by_camelcase_name_, camelcase_key, it->second);
+  }
+}
+
 inline const FieldDescriptor* FileDescriptorTables::FindFieldByCamelcaseName(
     const void* parent, const string& camelcase_name) const {
+  fields_by_camelcase_name_once_.Init(
+      &FileDescriptorTables::FieldsByCamelcaseNamesLazyInitStatic, this);
   return FindPtrOrNull(fields_by_camelcase_name_,
                        PointerStringPair(parent, camelcase_name.c_str()));
 }
@@ -1004,7 +1103,7 @@ FileDescriptorTables::FindEnumValueByNumberCreatingIfUnknown(
 
 
 inline const FieldDescriptor* DescriptorPool::Tables::FindExtension(
-    const Descriptor* extendee, int number) {
+    const Descriptor* extendee, int number) const {
   return FindPtrOrNull(extensions_, std::make_pair(extendee, number));
 }
 
@@ -1045,24 +1144,40 @@ bool DescriptorPool::Tables::AddFile(const FileDescriptor* file) {
   }
 }
 
+void FileDescriptorTables::FinalizeTables() {
+  // Clean up the temporary maps used by AddFieldByStylizedNames().
+  delete fields_by_lowercase_name_tmp_;
+  fields_by_lowercase_name_tmp_ = NULL;
+  delete fields_by_camelcase_name_tmp_;
+  fields_by_camelcase_name_tmp_ = NULL;
+}
+
 void FileDescriptorTables::AddFieldByStylizedNames(
     const FieldDescriptor* field) {
-  const void* parent;
-  if (field->is_extension()) {
-    if (field->extension_scope() == NULL) {
-      parent = field->file();
-    } else {
-      parent = field->extension_scope();
-    }
-  } else {
-    parent = field->containing_type();
-  }
+  const void* parent = FindParentForFieldsByMap(field);
+
+  // We want fields_by_{lower,camel}case_name_ to be lazily built, but
+  // cross-link order determines which entry will be present in the case of a
+  // conflict. So we use the temporary maps that get destroyed after
+  // BuildFileImpl() to detect the conflicts, and only store the conflicts in
+  // the map that will persist. We will then lazily populate the rest of the
+  // entries from fields_by_number_.
 
   PointerStringPair lowercase_key(parent, field->lowercase_name().c_str());
-  InsertIfNotPresent(&fields_by_lowercase_name_, lowercase_key, field);
+  if (!InsertIfNotPresent(fields_by_lowercase_name_tmp_, lowercase_key,
+                          field)) {
+    InsertIfNotPresent(
+        &fields_by_lowercase_name_, lowercase_key,
+        FindPtrOrNull(*fields_by_lowercase_name_tmp_, lowercase_key));
+  }
 
   PointerStringPair camelcase_key(parent, field->camelcase_name().c_str());
-  InsertIfNotPresent(&fields_by_camelcase_name_, camelcase_key, field);
+  if (!InsertIfNotPresent(fields_by_camelcase_name_tmp_, camelcase_key,
+                          field)) {
+    InsertIfNotPresent(
+        &fields_by_camelcase_name_, camelcase_key,
+        FindPtrOrNull(*fields_by_camelcase_name_tmp_, camelcase_key));
+  }
 }
 
 bool FileDescriptorTables::AddFieldByNumber(const FieldDescriptor* field) {
@@ -1104,6 +1219,12 @@ string* DescriptorPool::Tables::AllocateString(const string& value) {
   return result;
 }
 
+GoogleOnceDynamic* DescriptorPool::Tables::AllocateOnceDynamic() {
+  GoogleOnceDynamic* result = new GoogleOnceDynamic();
+  once_dynamics_.push_back(result);
+  return result;
+}
+
 template<typename Type>
 Type* DescriptorPool::Tables::AllocateMessage(Type* /* dummy */) {
   Type* result = new Type;
@@ -1157,8 +1278,10 @@ DescriptorPool::DescriptorPool()
     underlay_(NULL),
     tables_(new Tables),
     enforce_dependencies_(true),
+    lazily_build_dependencies_(false),
     allow_unknown_(false),
-    enforce_weak_(false) {}
+    enforce_weak_(false),
+    disallow_enforce_utf8_(false) {}
 
 DescriptorPool::DescriptorPool(DescriptorDatabase* fallback_database,
                                ErrorCollector* error_collector)
@@ -1168,8 +1291,10 @@ DescriptorPool::DescriptorPool(DescriptorDatabase* fallback_database,
     underlay_(NULL),
     tables_(new Tables),
     enforce_dependencies_(true),
+    lazily_build_dependencies_(false),
     allow_unknown_(false),
-    enforce_weak_(false) {
+    enforce_weak_(false),
+    disallow_enforce_utf8_(false) {
 }
 
 DescriptorPool::DescriptorPool(const DescriptorPool* underlay)
@@ -1179,8 +1304,10 @@ DescriptorPool::DescriptorPool(const DescriptorPool* underlay)
     underlay_(underlay),
     tables_(new Tables),
     enforce_dependencies_(true),
+    lazily_build_dependencies_(false),
     allow_unknown_(false),
-    enforce_weak_(false) {}
+    enforce_weak_(false),
+    disallow_enforce_utf8_(false) {}
 
 DescriptorPool::~DescriptorPool() {
   if (mutex_ != NULL) delete mutex_;
@@ -1225,6 +1352,7 @@ void DeleteGeneratedPool() {
 static void InitGeneratedPool() {
   generated_database_ = new EncodedDescriptorDatabase;
   generated_pool_ = new DescriptorPool(generated_database_);
+  generated_pool_->InternalSetLazilyBuildDependencies();
 
   internal::OnShutdown(&DeleteGeneratedPool);
 }
@@ -1284,8 +1412,10 @@ void DescriptorPool::InternalAddGeneratedFile(
 
 const FileDescriptor* DescriptorPool::FindFileByName(const string& name) const {
   MutexLockMaybe lock(mutex_);
-  tables_->known_bad_symbols_.clear();
-  tables_->known_bad_files_.clear();
+  if (fallback_database_ != NULL) {
+    tables_->known_bad_symbols_.clear();
+    tables_->known_bad_files_.clear();
+  }
   const FileDescriptor* result = tables_->FindFile(name);
   if (result != NULL) return result;
   if (underlay_ != NULL) {
@@ -1302,8 +1432,10 @@ const FileDescriptor* DescriptorPool::FindFileByName(const string& name) const {
 const FileDescriptor* DescriptorPool::FindFileContainingSymbol(
     const string& symbol_name) const {
   MutexLockMaybe lock(mutex_);
-  tables_->known_bad_symbols_.clear();
-  tables_->known_bad_files_.clear();
+  if (fallback_database_ != NULL) {
+    tables_->known_bad_symbols_.clear();
+    tables_->known_bad_files_.clear();
+  }
   Symbol result = tables_->FindSymbol(symbol_name);
   if (!result.IsNull()) return result.GetFile();
   if (underlay_ != NULL) {
@@ -1379,9 +1511,20 @@ const MethodDescriptor* DescriptorPool::FindMethodByName(
 
 const FieldDescriptor* DescriptorPool::FindExtensionByNumber(
     const Descriptor* extendee, int number) const {
+  // A faster path to reduce lock contention in finding extensions, assuming
+  // most extensions will be cache hit.
+  if (mutex_ != NULL) {
+    ReaderMutexLock lock(mutex_);
+    const FieldDescriptor* result = tables_->FindExtension(extendee, number);
+    if (result != NULL) {
+      return result;
+    }
+  }
   MutexLockMaybe lock(mutex_);
-  tables_->known_bad_symbols_.clear();
-  tables_->known_bad_files_.clear();
+  if (fallback_database_ != NULL) {
+    tables_->known_bad_symbols_.clear();
+    tables_->known_bad_files_.clear();
+  }
   const FieldDescriptor* result = tables_->FindExtension(extendee, number);
   if (result != NULL) {
     return result;
@@ -1403,8 +1546,10 @@ void DescriptorPool::FindAllExtensions(
     const Descriptor* extendee,
     std::vector<const FieldDescriptor*>* out) const {
   MutexLockMaybe lock(mutex_);
-  tables_->known_bad_symbols_.clear();
-  tables_->known_bad_files_.clear();
+  if (fallback_database_ != NULL) {
+    tables_->known_bad_symbols_.clear();
+    tables_->known_bad_files_.clear();
+  }
 
   // Initialize tables_->extensions_ from the fallback database first
   // (but do this only once per descriptor).
@@ -1656,6 +1801,15 @@ FileDescriptor::FindExtensionByCamelcaseName(const string& key) const {
   }
 }
 
+void Descriptor::ExtensionRange::CopyTo(
+    DescriptorProto_ExtensionRange* proto) const {
+  proto->set_start(this->start);
+  proto->set_end(this->end);
+  if (options_ != &google::protobuf::ExtensionRangeOptions::default_instance()) {
+    *proto->mutable_options() = *options_;
+  }
+}
+
 const Descriptor::ExtensionRange*
 Descriptor::FindExtensionRangeContainingNumber(int number) const {
   // Linear search should be fine because we don't expect a message to have
@@ -1681,6 +1835,18 @@ Descriptor::FindReservedRangeContainingNumber(int number) const {
   return NULL;
 }
 
+const EnumDescriptor::ReservedRange*
+EnumDescriptor::FindReservedRangeContainingNumber(int number) const {
+  // TODO(chrisn): Consider a non-linear search.
+  for (int i = 0; i < reserved_range_count(); i++) {
+    if (number >= reserved_range(i)->start &&
+        number <= reserved_range(i)->end) {
+      return reserved_range(i);
+    }
+  }
+  return NULL;
+}
+
 // -------------------------------------------------------------------
 
 bool DescriptorPool::TryFindFileInFallbackDatabase(const string& name) const {
@@ -1786,8 +1952,8 @@ bool DescriptorPool::TryFindExtensionInFallbackDatabase(
 
 // ===================================================================
 
-bool FieldDescriptor::is_map() const {
-  return type() == TYPE_MESSAGE && message_type()->options().map_entry();
+bool FieldDescriptor::is_map_message_type() const {
+  return message_type_->options().map_entry();
 }
 
 string FieldDescriptor::DefaultValueAsString(bool quote_string_type) const {
@@ -1911,9 +2077,7 @@ void Descriptor::CopyTo(DescriptorProto* proto) const {
     enum_type(i)->CopyTo(proto->add_enum_type());
   }
   for (int i = 0; i < extension_range_count(); i++) {
-    DescriptorProto::ExtensionRange* range = proto->add_extension_range();
-    range->set_start(extension_range(i)->start);
-    range->set_end(extension_range(i)->end);
+    extension_range(i)->CopyTo(proto->add_extension_range());
   }
   for (int i = 0; i < extension_count(); i++) {
     extension(i)->CopyTo(proto->add_extension());
@@ -2019,6 +2183,14 @@ void EnumDescriptor::CopyTo(EnumDescriptorProto* proto) const {
   for (int i = 0; i < value_count(); i++) {
     value(i)->CopyTo(proto->add_value());
   }
+  for (int i = 0; i < reserved_range_count(); i++) {
+    EnumDescriptorProto::EnumReservedRange* range = proto->add_reserved_range();
+    range->set_start(reserved_range(i)->start);
+    range->set_end(reserved_range(i)->end);
+  }
+  for (int i = 0; i < reserved_name_count(); i++) {
+    proto->add_reserved_name(reserved_name(i));
+  }
 
   if (&options() != &EnumOptions::default_instance()) {
     proto->mutable_options()->CopyFrom(options());
@@ -2136,7 +2308,7 @@ bool RetrieveOptions(int depth, const Message& options,
       return RetrieveOptionsAssumingRightPool(depth, options, option_entries);
     }
     DynamicMessageFactory factory;
-    google::protobuf::scoped_ptr<Message> dynamic_options(
+    std::unique_ptr<Message> dynamic_options(
         factory.GetPrototype(option_descriptor)->New());
     if (dynamic_options->ParseFromString(options.SerializeAsString())) {
       return RetrieveOptionsAssumingRightPool(depth, *dynamic_options,
@@ -2651,6 +2823,30 @@ void EnumDescriptor::DebugString(int depth, string *contents,
   for (int i = 0; i < value_count(); i++) {
     value(i)->DebugString(depth, contents, debug_string_options);
   }
+
+  if (reserved_range_count() > 0) {
+    strings::SubstituteAndAppend(contents, "$0  reserved ", prefix);
+    for (int i = 0; i < reserved_range_count(); i++) {
+      const EnumDescriptor::ReservedRange* range = reserved_range(i);
+      if (range->end == range->start) {
+        strings::SubstituteAndAppend(contents, "$0, ", range->start);
+      } else {
+        strings::SubstituteAndAppend(contents, "$0 to $1, ",
+                                     range->start, range->end);
+      }
+    }
+    contents->replace(contents->size() - 2, 2, ";\n");
+  }
+
+  if (reserved_name_count() > 0) {
+    strings::SubstituteAndAppend(contents, "$0  reserved ", prefix);
+    for (int i = 0; i < reserved_name_count(); i++) {
+      strings::SubstituteAndAppend(contents, "\"$0\", ",
+                                   CEscape(reserved_name(i)));
+    }
+    contents->replace(contents->size() - 2, 2, ";\n");
+  }
+
   strings::SubstituteAndAppend(contents, "$0}\n", prefix);
 
   comment_printer.AddPostComment(contents);
@@ -2922,15 +3118,18 @@ namespace {
 struct OptionsToInterpret {
   OptionsToInterpret(const string& ns,
                      const string& el,
+                     std::vector<int>& path,
                      const Message* orig_opt,
                      Message* opt)
       : name_scope(ns),
         element_name(el),
+        element_path(path),
         original_options(orig_opt),
         options(opt) {
   }
   string name_scope;
   string element_name;
+  std::vector<int> element_path;
   const Message* original_options;
   Message* options;
 };
@@ -2950,7 +3149,7 @@ class DescriptorBuilder {
   friend class OptionInterpreter;
 
   // Non-recursive part of BuildFile functionality.
-  const FileDescriptor* BuildFileImpl(const FileDescriptorProto& proto);
+  FileDescriptor* BuildFileImpl(const FileDescriptorProto& proto);
 
   const DescriptorPool* pool_;
   DescriptorPool::Tables* tables_;  // for convenience
@@ -3023,15 +3222,16 @@ class DescriptorBuilder {
   // - Search the pool's underlay if not found in tables_.
   // - Insure that the resulting Symbol is from one of the file's declared
   //   dependencies.
-  Symbol FindSymbol(const string& name);
+  Symbol FindSymbol(const string& name, bool build_it = true);
 
   // Like FindSymbol() but does not require that the symbol is in one of the
   // file's declared dependencies.
-  Symbol FindSymbolNotEnforcingDeps(const string& name);
+  Symbol FindSymbolNotEnforcingDeps(const string& name, bool build_it = true);
 
   // This implements the body of FindSymbolNotEnforcingDeps().
   Symbol FindSymbolNotEnforcingDepsHelper(const DescriptorPool* pool,
-                                          const string& name);
+                                          const string& name,
+                                          bool build_it = true);
 
   // Like FindSymbol(), but looks up the name relative to some other symbol
   // name.  This first searches siblings of relative_to, then siblings of its
@@ -3047,31 +3247,21 @@ class DescriptorBuilder {
   // that LookupSymbol may still return a non-type symbol in LOOKUP_TYPES mode,
   // if it believes that's all it could refer to.  The caller should always
   // check that it receives the type of symbol it was expecting.
-  enum PlaceholderType {
-    PLACEHOLDER_MESSAGE,
-    PLACEHOLDER_ENUM,
-    PLACEHOLDER_EXTENDABLE_MESSAGE
-  };
   enum ResolveMode {
     LOOKUP_ALL, LOOKUP_TYPES
   };
   Symbol LookupSymbol(const string& name, const string& relative_to,
-                      PlaceholderType placeholder_type = PLACEHOLDER_MESSAGE,
-                      ResolveMode resolve_mode = LOOKUP_ALL);
+                      DescriptorPool::PlaceholderType placeholder_type =
+                          DescriptorPool::PLACEHOLDER_MESSAGE,
+                      ResolveMode resolve_mode = LOOKUP_ALL,
+                      bool build_it = true);
 
   // Like LookupSymbol() but will not return a placeholder even if
   // AllowUnknownDependencies() has been used.
   Symbol LookupSymbolNoPlaceholder(const string& name,
                                    const string& relative_to,
-                                   ResolveMode resolve_mode = LOOKUP_ALL);
-
-  // Creates a placeholder type suitable for return from LookupSymbol().  May
-  // return kNullSymbol if the name is not a valid type name.
-  Symbol NewPlaceholder(const string& name, PlaceholderType placeholder_type);
-
-  // Creates a placeholder file.  Never returns NULL.  This is used when an
-  // import is not found and AllowUnknownDependencies() is enabled.
-  FileDescriptor* NewPlaceholderFile(const string& name);
+                                   ResolveMode resolve_mode = LOOKUP_ALL,
+                                   bool build_it = true);
 
   // Calls tables_->AddSymbol() and records an error if it fails.  Returns
   // true if successful or false if failed, though most callers can ignore
@@ -3093,10 +3283,6 @@ class DescriptorBuilder {
   void ValidateSymbolName(const string& name, const string& full_name,
                           const Message& proto);
 
-  // Like ValidateSymbolName(), but the name is allowed to contain periods and
-  // an error is indicated by returning false (not recording the error).
-  bool ValidateQualifiedName(const string& name);
-
   // Used by BUILD_ARRAY macro (below) to avoid having to have the type
   // specified as a macro parameter.
   template <typename Type>
@@ -3110,7 +3296,7 @@ class DescriptorBuilder {
   // descriptor.proto.
   template<class DescriptorT> void AllocateOptions(
       const typename DescriptorT::OptionsType& orig_options,
-      DescriptorT* descriptor);
+      DescriptorT* descriptor, int options_field_tag);
   // Specialization for FileOptions.
   void AllocateOptions(const FileOptions& orig_options,
                        FileDescriptor* descriptor);
@@ -3120,7 +3306,8 @@ class DescriptorBuilder {
       const string& name_scope,
       const string& element_name,
       const typename DescriptorT::OptionsType& orig_options,
-      DescriptorT* descriptor);
+      DescriptorT* descriptor,
+      std::vector<int>& options_path);
 
   // These methods all have the same signature for the sake of the BUILD_ARRAY
   // macro, below.
@@ -3147,6 +3334,9 @@ class DescriptorBuilder {
   void BuildReservedRange(const DescriptorProto::ReservedRange& proto,
                            const Descriptor* parent,
                            Descriptor::ReservedRange* result);
+  void BuildReservedRange(const EnumDescriptorProto::EnumReservedRange& proto,
+                          const EnumDescriptor* parent,
+                          EnumDescriptor::ReservedRange* result);
   void BuildOneof(const OneofDescriptorProto& proto,
                   Descriptor* parent,
                   OneofDescriptor* result);
@@ -3177,6 +3367,8 @@ class DescriptorBuilder {
   void CrossLinkMessage(Descriptor* message, const DescriptorProto& proto);
   void CrossLinkField(FieldDescriptor* field,
                       const FieldDescriptorProto& proto);
+  void CrossLinkExtensionRange(Descriptor::ExtensionRange* range,
+                               const DescriptorProto::ExtensionRange& proto);
   void CrossLinkEnum(EnumDescriptor* enum_type,
                      const EnumDescriptorProto& proto);
   void CrossLinkEnumValue(EnumValueDescriptor* enum_value,
@@ -3204,13 +3396,21 @@ class DescriptorBuilder {
     // Otherwise returns true.
     bool InterpretOptions(OptionsToInterpret* options_to_interpret);
 
+    // Updates the given source code info by re-writing uninterpreted option
+    // locations to refer to the corresponding interpreted option.
+    void UpdateSourceCodeInfo(SourceCodeInfo* info);
+
     class AggregateOptionFinder;
 
    private:
     // Interprets uninterpreted_option_ on the specified message, which
     // must be the mutable copy of the original options message to which
-    // uninterpreted_option_ belongs.
-    bool InterpretSingleOption(Message* options);
+    // uninterpreted_option_ belongs. The given src_path is the source
+    // location path to the uninterpreted option, and options_path is the
+    // source location path to the options message. The location paths are
+    // recorded and then used in UpdateSourceCodeInfo.
+    bool InterpretSingleOption(Message* options, std::vector<int>& src_path,
+                               std::vector<int>& options_path);
 
     // Adds the uninterpreted_option to the given options message verbatim.
     // Used when AllowUnknownDependencies() is in effect and we can't find
@@ -3285,6 +3485,16 @@ class DescriptorBuilder {
     // can use it to find locations recorded by the parser.
     const UninterpretedOption* uninterpreted_option_;
 
+    // This maps the element path of uninterpreted options to the element path
+    // of the resulting interpreted option. This is used to modify a file's
+    // source code info to account for option interpretation.
+    std::map<std::vector<int>, std::vector<int>> interpreted_paths_;
+
+    // This maps the path to a repeated option field to the known number of
+    // elements the field contains. This is used to track the compute the
+    // index portion of the element path when interpreting a single option.
+    std::map<std::vector<int>, int> repeated_option_counts_;
+
     // Factory used to create the dynamic messages we need to parse
     // any aggregate option values we encounter.
     DynamicMessageFactory dynamic_factory_;
@@ -3356,6 +3566,8 @@ class DescriptorBuilder {
   void DetectMapConflicts(const Descriptor* message,
                           const DescriptorProto& proto);
 
+  void ValidateJSType(FieldDescriptor* field,
+                      const FieldDescriptorProto& proto);
 };
 
 const FileDescriptor* DescriptorPool::BuildFile(
@@ -3483,8 +3695,8 @@ void DescriptorBuilder::AddWarning(
 bool DescriptorBuilder::IsInPackage(const FileDescriptor* file,
                                     const string& package_name) {
   return HasPrefixString(file->package(), package_name) &&
-           (file->package().size() == package_name.size() ||
-            file->package()[package_name.size()] == '.');
+         (file->package().size() == package_name.size() ||
+          file->package()[package_name.size()] == '.');
 }
 
 void DescriptorBuilder::RecordPublicDependencies(const FileDescriptor* file) {
@@ -3495,7 +3707,7 @@ void DescriptorBuilder::RecordPublicDependencies(const FileDescriptor* file) {
 }
 
 Symbol DescriptorBuilder::FindSymbolNotEnforcingDepsHelper(
-    const DescriptorPool* pool, const string& name) {
+    const DescriptorPool* pool, const string& name, bool build_it) {
   // If we are looking at an underlay, we must lock its mutex_, since we are
   // accessing the underlay's tables_ directly.
   MutexLockMaybe lock((pool == pool_) ? NULL : pool->mutex_);
@@ -3507,12 +3719,14 @@ Symbol DescriptorBuilder::FindSymbolNotEnforcingDepsHelper(
   }
 
   if (result.IsNull()) {
-    // In theory, we shouldn't need to check fallback_database_ because the
-    // symbol should be in one of its file's direct dependencies, and we have
-    // already loaded those by the time we get here.  But we check anyway so
-    // that we can generate better error message when dependencies are missing
-    // (i.e., "missing dependency" rather than "type is not defined").
-    if (pool->TryFindSymbolInFallbackDatabase(name)) {
+    // With lazily_build_dependencies_, a symbol lookup at cross link time is
+    // not guaranteed to be successful. In most cases, build_it will be false,
+    // which intentionally prevents us from building an import until it's
+    // actually needed. In some cases, like registering an extension, we want
+    // to build the file containing the symbol, and build_it will be set.
+    // Also, build_it will be true when !lazily_build_dependencies_, to provide
+    // better error reporting of missing dependencies.
+    if (build_it && pool->TryFindSymbolInFallbackDatabase(name)) {
       result = pool->tables_->FindSymbol(name);
     }
   }
@@ -3520,17 +3734,18 @@ Symbol DescriptorBuilder::FindSymbolNotEnforcingDepsHelper(
   return result;
 }
 
-Symbol DescriptorBuilder::FindSymbolNotEnforcingDeps(const string& name) {
-  return FindSymbolNotEnforcingDepsHelper(pool_, name);
+Symbol DescriptorBuilder::FindSymbolNotEnforcingDeps(const string& name,
+                                                     bool build_it) {
+  return FindSymbolNotEnforcingDepsHelper(pool_, name, build_it);
 }
 
-Symbol DescriptorBuilder::FindSymbol(const string& name) {
-  Symbol result = FindSymbolNotEnforcingDeps(name);
+Symbol DescriptorBuilder::FindSymbol(const string& name, bool build_it) {
+  Symbol result = FindSymbolNotEnforcingDeps(name, build_it);
 
   if (result.IsNull()) return result;
 
   if (!pool_->enforce_dependencies_) {
-    // Hack for CompilerUpgrader.
+    // Hack for CompilerUpgrader, and also used for lazily_build_dependencies_
     return result;
   }
 
@@ -3564,14 +3779,16 @@ Symbol DescriptorBuilder::FindSymbol(const string& name) {
   return kNullSymbol;
 }
 
-Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(
-    const string& name, const string& relative_to, ResolveMode resolve_mode) {
+Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(const string& name,
+                                                    const string& relative_to,
+                                                    ResolveMode resolve_mode,
+                                                    bool build_it) {
   possible_undeclared_dependency_ = NULL;
   undefine_resolved_name_.clear();
 
-  if (name.size() > 0 && name[0] == '.') {
+  if (!name.empty() && name[0] == '.') {
     // Fully-qualified name.
-    return FindSymbol(name.substr(1));
+    return FindSymbol(name.substr(1), build_it);
   }
 
   // If name is something like "Foo.Bar.baz", and symbols named "Foo" are
@@ -3599,7 +3816,7 @@ Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(
     // Chop off the last component of the scope.
     string::size_type dot_pos = scope_to_try.find_last_of('.');
     if (dot_pos == string::npos) {
-      return FindSymbol(name);
+      return FindSymbol(name, build_it);
     } else {
       scope_to_try.erase(dot_pos);
     }
@@ -3608,7 +3825,7 @@ Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(
     string::size_type old_size = scope_to_try.size();
     scope_to_try.append(1, '.');
     scope_to_try.append(first_part_of_name);
-    Symbol result = FindSymbol(scope_to_try);
+    Symbol result = FindSymbol(scope_to_try, build_it);
     if (!result.IsNull()) {
       if (first_part_of_name.size() < name.size()) {
         // name is a compound symbol, of which we only found the first part.
@@ -3616,7 +3833,7 @@ Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(
         if (result.IsAggregate()) {
           scope_to_try.append(name, first_part_of_name.size(),
                               name.size() - first_part_of_name.size());
-          result = FindSymbol(scope_to_try);
+          result = FindSymbol(scope_to_try, build_it);
           if (result.IsNull()) {
             undefine_resolved_name_ = scope_to_try;
           }
@@ -3640,19 +3857,49 @@ Symbol DescriptorBuilder::LookupSymbolNoPlaceholder(
 
 Symbol DescriptorBuilder::LookupSymbol(
     const string& name, const string& relative_to,
-    PlaceholderType placeholder_type, ResolveMode resolve_mode) {
-  Symbol result = LookupSymbolNoPlaceholder(
-      name, relative_to, resolve_mode);
+    DescriptorPool::PlaceholderType placeholder_type, ResolveMode resolve_mode,
+    bool build_it) {
+  Symbol result =
+      LookupSymbolNoPlaceholder(name, relative_to, resolve_mode, build_it);
   if (result.IsNull() && pool_->allow_unknown_) {
     // Not found, but AllowUnknownDependencies() is enabled.  Return a
     // placeholder instead.
-    result = NewPlaceholder(name, placeholder_type);
+    result = pool_->NewPlaceholderWithMutexHeld(name, placeholder_type);
   }
   return result;
 }
 
-Symbol DescriptorBuilder::NewPlaceholder(const string& name,
-                                         PlaceholderType placeholder_type) {
+static bool ValidateQualifiedName(const string& name) {
+  bool last_was_period = false;
+
+  for (int i = 0; i < name.size(); i++) {
+    // I don't trust isalnum() due to locales.  :(
+    if (('a' <= name[i] && name[i] <= 'z') ||
+        ('A' <= name[i] && name[i] <= 'Z') ||
+        ('0' <= name[i] && name[i] <= '9') || (name[i] == '_')) {
+      last_was_period = false;
+    } else if (name[i] == '.') {
+      if (last_was_period) return false;
+      last_was_period = true;
+    } else {
+      return false;
+    }
+  }
+
+  return !name.empty() && !last_was_period;
+}
+
+Symbol DescriptorPool::NewPlaceholder(const string& name,
+                                      PlaceholderType placeholder_type) const {
+  MutexLockMaybe lock(mutex_);
+  return NewPlaceholderWithMutexHeld(name, placeholder_type);
+}
+
+Symbol DescriptorPool::NewPlaceholderWithMutexHeld(
+    const string& name, PlaceholderType placeholder_type) const {
+  if (mutex_) {
+    mutex_->AssertHeld();
+  }
   // Compute names.
   const string* placeholder_full_name;
   const string* placeholder_name;
@@ -3678,7 +3925,7 @@ Symbol DescriptorBuilder::NewPlaceholder(const string& name,
   }
 
   // Create the placeholders.
-  FileDescriptor* placeholder_file = NewPlaceholderFile(
+  FileDescriptor* placeholder_file = NewPlaceholderFileWithMutexHeld(
       *placeholder_full_name + ".placeholder.proto");
   placeholder_file->package_ = placeholder_package;
 
@@ -3744,19 +3991,28 @@ Symbol DescriptorBuilder::NewPlaceholder(const string& name,
   }
 }
 
-FileDescriptor* DescriptorBuilder::NewPlaceholderFile(
-    const string& name) {
+FileDescriptor* DescriptorPool::NewPlaceholderFile(const string& name) const {
+  MutexLockMaybe lock(mutex_);
+  return NewPlaceholderFileWithMutexHeld(name);
+}
+
+FileDescriptor* DescriptorPool::NewPlaceholderFileWithMutexHeld(
+    const string& name) const {
+  if (mutex_) {
+    mutex_->AssertHeld();
+  }
   FileDescriptor* placeholder = tables_->Allocate<FileDescriptor>();
   memset(placeholder, 0, sizeof(*placeholder));
 
   placeholder->name_ = tables_->AllocateString(name);
   placeholder->package_ = &internal::GetEmptyString();
-  placeholder->pool_ = pool_;
+  placeholder->pool_ = this;
   placeholder->options_ = &FileOptions::default_instance();
   placeholder->tables_ = &FileDescriptorTables::GetEmptyInstance();
   placeholder->source_code_info_ = &SourceCodeInfo::default_instance();
   placeholder->is_placeholder_ = true;
   placeholder->syntax_ = FileDescriptor::SYNTAX_PROTO2;
+  placeholder->finished_building_ = true;
   // All other fields are zero or NULL.
 
   return placeholder;
@@ -3850,51 +4106,36 @@ void DescriptorBuilder::ValidateSymbolName(
   }
 }
 
-bool DescriptorBuilder::ValidateQualifiedName(const string& name) {
-  bool last_was_period = false;
-
-  for (int i = 0; i < name.size(); i++) {
-    // I don't trust isalnum() due to locales.  :(
-    if (('a' <= name[i] && name[i] <= 'z') ||
-        ('A' <= name[i] && name[i] <= 'Z') ||
-        ('0' <= name[i] && name[i] <= '9') ||
-        (name[i] == '_')) {
-      last_was_period = false;
-    } else if (name[i] == '.') {
-      if (last_was_period) return false;
-      last_was_period = true;
-    } else {
-      return false;
-    }
-  }
-
-  return !name.empty() && !last_was_period;
-}
-
 // -------------------------------------------------------------------
 
 // This generic implementation is good for all descriptors except
 // FileDescriptor.
 template<class DescriptorT> void DescriptorBuilder::AllocateOptions(
     const typename DescriptorT::OptionsType& orig_options,
-    DescriptorT* descriptor) {
+    DescriptorT* descriptor, int options_field_tag) {
+  std::vector<int> options_path;
+  descriptor->GetLocationPath(&options_path);
+  options_path.push_back(options_field_tag);
   AllocateOptionsImpl(descriptor->full_name(), descriptor->full_name(),
-                      orig_options, descriptor);
+                      orig_options, descriptor, options_path);
 }
 
 // We specialize for FileDescriptor.
 void DescriptorBuilder::AllocateOptions(const FileOptions& orig_options,
                                         FileDescriptor* descriptor) {
+  std::vector<int> options_path;
+  options_path.push_back(FileDescriptorProto::kOptionsFieldNumber);
   // We add the dummy token so that LookupSymbol does the right thing.
   AllocateOptionsImpl(descriptor->package() + ".dummy", descriptor->name(),
-                      orig_options, descriptor);
+                      orig_options, descriptor, options_path);
 }
 
 template<class DescriptorT> void DescriptorBuilder::AllocateOptionsImpl(
     const string& name_scope,
     const string& element_name,
     const typename DescriptorT::OptionsType& orig_options,
-    DescriptorT* descriptor) {
+    DescriptorT* descriptor,
+    std::vector<int>& options_path) {
   // We need to use a dummy pointer to work around a bug in older versions of
   // GCC.  Otherwise, the following two lines could be replaced with:
   //   typename DescriptorT::OptionsType* options =
@@ -3917,7 +4158,8 @@ template<class DescriptorT> void DescriptorBuilder::AllocateOptionsImpl(
   // we're still trying to build it.
   if (options->uninterpreted_option_size() > 0) {
     options_to_interpret_.push_back(
-        OptionsToInterpret(name_scope, element_name, &orig_options, options));
+        OptionsToInterpret(name_scope, element_name, options_path,
+            &orig_options, options));
   }
 }
 
@@ -4014,35 +4256,50 @@ const FileDescriptor* DescriptorBuilder::BuildFile(
     }
   }
 
-  // If we have a fallback_database_, attempt to load all dependencies now,
-  // before checkpointing tables_.  This avoids confusion with recursive
-  // checkpoints.
-  if (pool_->fallback_database_ != NULL) {
-    tables_->pending_files_.push_back(proto.name());
-    for (int i = 0; i < proto.dependency_size(); i++) {
-      if (tables_->FindFile(proto.dependency(i)) == NULL &&
-          (pool_->underlay_ == NULL ||
-           pool_->underlay_->FindFileByName(proto.dependency(i)) == NULL)) {
-        // We don't care what this returns since we'll find out below anyway.
-        pool_->TryFindFileInFallbackDatabase(proto.dependency(i));
+  // If we have a fallback_database_, and we aren't doing lazy import building,
+  // attempt to load all dependencies now, before checkpointing tables_.  This
+  // avoids confusion with recursive checkpoints.
+  if (!pool_->lazily_build_dependencies_) {
+    if (pool_->fallback_database_ != NULL) {
+      tables_->pending_files_.push_back(proto.name());
+      for (int i = 0; i < proto.dependency_size(); i++) {
+        if (tables_->FindFile(proto.dependency(i)) == NULL &&
+            (pool_->underlay_ == NULL ||
+             pool_->underlay_->FindFileByName(proto.dependency(i)) == NULL)) {
+          // We don't care what this returns since we'll find out below anyway.
+          pool_->TryFindFileInFallbackDatabase(proto.dependency(i));
+        }
       }
+      tables_->pending_files_.pop_back();
     }
-    tables_->pending_files_.pop_back();
   }
-  return BuildFileImpl(proto);
-}
 
-const FileDescriptor* DescriptorBuilder::BuildFileImpl(
-    const FileDescriptorProto& proto) {
   // Checkpoint the tables so that we can roll back if something goes wrong.
   tables_->AddCheckpoint();
 
+  FileDescriptor* result = BuildFileImpl(proto);
+
+  file_tables_->FinalizeTables();
+  if (result) {
+    tables_->ClearLastCheckpoint();
+    result->finished_building_ = true;
+  } else {
+    tables_->RollbackToLastCheckpoint();
+  }
+
+  return result;
+}
+
+FileDescriptor* DescriptorBuilder::BuildFileImpl(
+    const FileDescriptorProto& proto) {
   FileDescriptor* result = tables_->Allocate<FileDescriptor>();
   file_ = result;
 
   result->is_placeholder_ = false;
+  result->finished_building_ = false;
+  SourceCodeInfo *info = NULL;
   if (proto.has_source_code_info()) {
-    SourceCodeInfo *info = tables_->AllocateMessage<SourceCodeInfo>();
+    info = tables_->AllocateMessage<SourceCodeInfo>();
     info->CopyFrom(proto.source_code_info());
     result->source_code_info_ = info;
   } else {
@@ -4087,7 +4344,6 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
              "A file with this name is already in the pool.");
     // Bail out early so that if this is actually the exact same file, we
     // don't end up reporting that every single symbol is already defined.
-    tables_->RollbackToLastCheckpoint();
     return NULL;
   }
   if (!result->package().empty()) {
@@ -4098,7 +4354,19 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
   std::set<string> seen_dependencies;
   result->dependency_count_ = proto.dependency_size();
   result->dependencies_ =
-    tables_->AllocateArray<const FileDescriptor*>(proto.dependency_size());
+      tables_->AllocateArray<const FileDescriptor*>(proto.dependency_size());
+  if (pool_->lazily_build_dependencies_) {
+    result->dependencies_once_ = tables_->AllocateOnceDynamic();
+    result->dependencies_names_ =
+        tables_->AllocateArray<const string*>(proto.dependency_size());
+    if (proto.dependency_size() > 0) {
+      memset(result->dependencies_names_, 0,
+             sizeof(*result->dependencies_names_) * proto.dependency_size());
+    }
+  } else {
+    result->dependencies_once_ = NULL;
+    result->dependencies_names_ = NULL;
+  }
   unused_dependency_.clear();
   std::set<int> weak_deps;
   for (int i = 0; i < proto.weak_dependency_size(); ++i) {
@@ -4118,16 +4386,18 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
       // Recursive import.  dependency/result is not fully initialized, and it's
       // dangerous to try to do anything with it.  The recursive import error
       // will be detected and reported in DescriptorBuilder::BuildFile().
-      tables_->RollbackToLastCheckpoint();
       return NULL;
     }
 
     if (dependency == NULL) {
-      if (pool_->allow_unknown_ ||
-          (!pool_->enforce_weak_ && weak_deps.find(i) != weak_deps.end())) {
-        dependency = NewPlaceholderFile(proto.dependency(i));
-      } else {
-        AddImportError(proto, i);
+      if (!pool_->lazily_build_dependencies_) {
+        if (pool_->allow_unknown_ ||
+            (!pool_->enforce_weak_ && weak_deps.find(i) != weak_deps.end())) {
+          dependency =
+              pool_->NewPlaceholderFileWithMutexHeld(proto.dependency(i));
+        } else {
+          AddImportError(proto, i);
+        }
       }
     } else {
       // Add to unused_dependency_ to track unused imported files.
@@ -4141,6 +4411,10 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
     }
 
     result->dependencies_[i] = dependency;
+    if (pool_->lazily_build_dependencies_ && !dependency) {
+      result->dependencies_names_[i] =
+          tables_->AllocateString(proto.dependency(i));
+    }
   }
 
   // Check public dependencies.
@@ -4153,7 +4427,12 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
     if (index >= 0 && index < proto.dependency_size()) {
       result->public_dependencies_[public_dependency_count++] = index;
       // Do not track unused imported files for public import.
-      unused_dependency_.erase(result->dependency(index));
+      // Calling dependency(i) builds that file when doing lazy imports,
+      // need to avoid doing this. Unused dependency detection isn't done
+      // when building lazily, anyways.
+      if (!pool_->lazily_build_dependencies_) {
+        unused_dependency_.erase(result->dependency(index));
+      }
     } else {
       AddError(proto.name(), proto,
                DescriptorPool::ErrorCollector::OTHER,
@@ -4164,8 +4443,13 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
 
   // Build dependency set
   dependencies_.clear();
-  for (int i = 0; i < result->dependency_count(); i++) {
-    RecordPublicDependencies(result->dependency(i));
+  // We don't/can't do proper dependency error checking when
+  // lazily_build_dependencies_, and calling dependency(i) will force
+  // a dependency to be built, which we don't want.
+  if (!pool_->lazily_build_dependencies_) {
+    for (int i = 0; i < result->dependency_count(); i++) {
+      RecordPublicDependencies(result->dependency(i));
+    }
   }
 
   // Check weak dependencies.
@@ -4213,10 +4497,15 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
       option_interpreter.InterpretOptions(&(*iter));
     }
     options_to_interpret_.clear();
+
+    if (info != NULL) {
+      option_interpreter.UpdateSourceCodeInfo(info);
+    }
   }
 
-  // Validate options.
-  if (!had_errors_) {
+  // Validate options. See comments at InternalSetLazilyBuildDependencies about
+  // error checking and lazy import building.
+  if (!had_errors_ && !pool_->lazily_build_dependencies_) {
     ValidateFileOptions(result, proto);
   }
 
@@ -4229,15 +4518,15 @@ const FileDescriptor* DescriptorBuilder::BuildFileImpl(
   }
 
 
-  if (!unused_dependency_.empty()) {
+  // Again, see comments at InternalSetLazilyBuildDependencies about error
+  // checking.
+  if (!unused_dependency_.empty() && !pool_->lazily_build_dependencies_) {
     LogUnusedDependency(proto, result);
   }
 
   if (had_errors_) {
-    tables_->RollbackToLastCheckpoint();
     return NULL;
   } else {
-    tables_->ClearLastCheckpoint();
     return result;
   }
 }
@@ -4283,7 +4572,8 @@ void DescriptorBuilder::BuildMessage(const DescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        DescriptorProto::kOptionsFieldNumber);
   }
 
   AddSymbol(result->full_name(), parent, result->name(),
@@ -4304,7 +4594,7 @@ void DescriptorBuilder::BuildMessage(const DescriptorProto& proto,
     }
   }
 
-  hash_set<string> reserved_name_set;
+  HASH_SET<string> reserved_name_set;
   for (int i = 0; i < proto.reserved_name_size(); i++) {
     const string& name = proto.reserved_name(i);
     if (reserved_name_set.find(name) == reserved_name_set.end()) {
@@ -4447,6 +4737,10 @@ void DescriptorBuilder::BuildFieldOrExtension(const FieldDescriptorProto& proto,
   result->extension_scope_ = NULL;
   result->message_type_ = NULL;
   result->enum_type_ = NULL;
+  result->type_name_ = NULL;
+  result->type_once_ = NULL;
+  result->default_value_enum_ = NULL;
+  result->default_value_enum_name_ = NULL;
 
   result->has_default_value_ = proto.has_default_value();
   if (proto.has_default_value() && result->is_repeated()) {
@@ -4659,7 +4953,8 @@ void DescriptorBuilder::BuildFieldOrExtension(const FieldDescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        FieldDescriptorProto::kOptionsFieldNumber);
   }
 
 
@@ -4689,6 +4984,21 @@ void DescriptorBuilder::BuildExtensionRange(
              DescriptorPool::ErrorCollector::NUMBER,
              "Extension range end number must be greater than start number.");
   }
+
+  if (!proto.has_options()) {
+    result->options_ = NULL;  // Will set to default_instance later.
+  } else {
+    std::vector<int> options_path;
+    parent->GetLocationPath(&options_path);
+    options_path.push_back(DescriptorProto::kExtensionRangeFieldNumber);
+    // find index of this extension range in order to compute path
+    int index;
+    for (index = 0; parent->extension_ranges_ + index != result; index++);
+    options_path.push_back(index);
+    options_path.push_back(DescriptorProto_ExtensionRange::kOptionsFieldNumber);
+    AllocateOptionsImpl(parent->full_name(), parent->full_name(),
+                        proto.options(), result, options_path);
+  }
 }
 
 void DescriptorBuilder::BuildReservedRange(
@@ -4704,6 +5014,19 @@ void DescriptorBuilder::BuildReservedRange(
   }
 }
 
+void DescriptorBuilder::BuildReservedRange(
+    const EnumDescriptorProto::EnumReservedRange& proto,
+    const EnumDescriptor* parent, EnumDescriptor::ReservedRange* result) {
+  result->start = proto.start();
+  result->end = proto.end();
+
+  if (result->start > result->end) {
+    AddError(parent->full_name(), proto,
+             DescriptorPool::ErrorCollector::NUMBER,
+             "Reserved range end number must be greater than start number.");
+  }
+}
+
 void DescriptorBuilder::BuildOneof(const OneofDescriptorProto& proto,
                                    Descriptor* parent,
                                    OneofDescriptor* result) {
@@ -4726,7 +5049,8 @@ void DescriptorBuilder::BuildOneof(const OneofDescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        OneofDescriptorProto::kOptionsFieldNumber);
   }
 
   AddSymbol(result->full_name(), parent, result->name(),
@@ -4825,6 +5149,17 @@ void DescriptorBuilder::BuildEnum(const EnumDescriptorProto& proto,
   }
 
   BUILD_ARRAY(proto, result, value, BuildEnumValue, result);
+  BUILD_ARRAY(proto, result, reserved_range, BuildReservedRange, result);
+
+  // Copy reserved names.
+  int reserved_name_count = proto.reserved_name_size();
+  result->reserved_name_count_ = reserved_name_count;
+  result->reserved_names_ =
+      tables_->AllocateArray<const string*>(reserved_name_count);
+  for (int i = 0; i < reserved_name_count; ++i) {
+    result->reserved_names_[i] =
+        tables_->AllocateString(proto.reserved_name(i));
+  }
 
   CheckEnumValueUniqueness(proto, result);
 
@@ -4832,11 +5167,62 @@ void DescriptorBuilder::BuildEnum(const EnumDescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        EnumDescriptorProto::kOptionsFieldNumber);
   }
 
   AddSymbol(result->full_name(), parent, result->name(),
             proto, Symbol(result));
+
+  for (int i = 0; i < proto.reserved_range_size(); i++) {
+    const EnumDescriptorProto_EnumReservedRange& range1 =
+        proto.reserved_range(i);
+    for (int j = i + 1; j < proto.reserved_range_size(); j++) {
+      const EnumDescriptorProto_EnumReservedRange& range2 =
+          proto.reserved_range(j);
+      if (range1.end() >= range2.start() && range2.end() >= range1.start()) {
+        AddError(result->full_name(), proto.reserved_range(i),
+                 DescriptorPool::ErrorCollector::NUMBER,
+                 strings::Substitute("Reserved range $0 to $1 overlaps with "
+                                     "already-defined range $2 to $3.",
+                                     range2.start(), range2.end(),
+                                     range1.start(), range1.end()));
+      }
+    }
+  }
+
+  HASH_SET<string> reserved_name_set;
+  for (int i = 0; i < proto.reserved_name_size(); i++) {
+    const string& name = proto.reserved_name(i);
+    if (reserved_name_set.find(name) == reserved_name_set.end()) {
+      reserved_name_set.insert(name);
+    } else {
+      AddError(name, proto, DescriptorPool::ErrorCollector::NAME,
+               strings::Substitute(
+                 "Enum value \"$0\" is reserved multiple times.",
+                 name));
+    }
+  }
+
+  for (int i = 0; i < result->value_count(); i++) {
+    const EnumValueDescriptor* value = result->value(i);
+    for (int j = 0; j < result->reserved_range_count(); j++) {
+      const EnumDescriptor::ReservedRange* range = result->reserved_range(j);
+      if (range->start <= value->number() && value->number() <= range->end) {
+        AddError(value->full_name(), proto.reserved_range(j),
+                 DescriptorPool::ErrorCollector::NUMBER,
+                 strings::Substitute(
+                   "Enum value \"$0\" uses reserved number $1.",
+                   value->name(), value->number()));
+      }
+    }
+    if (reserved_name_set.find(value->name()) != reserved_name_set.end()) {
+      AddError(value->full_name(), proto.value(i),
+               DescriptorPool::ErrorCollector::NAME,
+               strings::Substitute(
+                 "Enum value \"$0\" is reserved.", value->name()));
+    }
+  }
 }
 
 void DescriptorBuilder::BuildEnumValue(const EnumValueDescriptorProto& proto,
@@ -4859,7 +5245,8 @@ void DescriptorBuilder::BuildEnumValue(const EnumValueDescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        EnumValueDescriptorProto::kOptionsFieldNumber);
   }
 
   // Again, enum values are weird because we makes them appear as siblings
@@ -4926,7 +5313,8 @@ void DescriptorBuilder::BuildService(const ServiceDescriptorProto& proto,
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        ServiceDescriptorProto::kOptionsFieldNumber);
   }
 
   AddSymbol(result->full_name(), NULL, result->name(),
@@ -4947,14 +5335,15 @@ void DescriptorBuilder::BuildMethod(const MethodDescriptorProto& proto,
   ValidateSymbolName(proto.name(), *full_name, proto);
 
   // These will be filled in when cross-linking.
-  result->input_type_ = NULL;
-  result->output_type_ = NULL;
+  result->input_type_.Init();
+  result->output_type_.Init();
 
   // Copy options.
   if (!proto.has_options()) {
     result->options_ = NULL;  // Will set to default_instance later.
   } else {
-    AllocateOptions(proto.options(), result);
+    AllocateOptions(proto.options(), result,
+        MethodDescriptorProto::kOptionsFieldNumber);
   }
 
   result->client_streaming_ = proto.client_streaming();
@@ -5013,6 +5402,11 @@ void DescriptorBuilder::CrossLinkMessage(
     CrossLinkField(&message->extensions_[i], proto.extension(i));
   }
 
+  for (int i = 0; i < message->extension_range_count(); i++) {
+    CrossLinkExtensionRange(&message->extension_ranges_[i],
+                            proto.extension_range(i));
+  }
+
   // Set up field array for each oneof.
 
   // First count the number of fields per oneof.
@@ -5075,15 +5469,27 @@ void DescriptorBuilder::CrossLinkMessage(
   }
 }
 
+void DescriptorBuilder::CrossLinkExtensionRange(
+    Descriptor::ExtensionRange* range,
+    const DescriptorProto::ExtensionRange& proto) {
+  if (range->options_ == NULL) {
+    range->options_ = &ExtensionRangeOptions::default_instance();
+  }
+}
+
 void DescriptorBuilder::CrossLinkField(
     FieldDescriptor* field, const FieldDescriptorProto& proto) {
   if (field->options_ == NULL) {
     field->options_ = &FieldOptions::default_instance();
   }
 
+  // Add the field to the lowercase-name and camelcase-name tables.
+  file_tables_->AddFieldByStylizedNames(field);
+
   if (proto.has_extendee()) {
-    Symbol extendee = LookupSymbol(proto.extendee(), field->full_name(),
-                                   PLACEHOLDER_EXTENDABLE_MESSAGE);
+    Symbol extendee =
+        LookupSymbol(proto.extendee(), field->full_name(),
+                     DescriptorPool::PLACEHOLDER_EXTENDABLE_MESSAGE);
     if (extendee.IsNull()) {
       AddNotDefinedError(field->full_name(), proto,
                          DescriptorPool::ErrorCollector::EXTENDEE,
@@ -5128,21 +5534,56 @@ void DescriptorBuilder::CrossLinkField(
     bool expecting_enum = (proto.type() == FieldDescriptorProto::TYPE_ENUM) ||
                           proto.has_default_value();
 
-    Symbol type =
-      LookupSymbol(proto.type_name(), field->full_name(),
-                   expecting_enum ? PLACEHOLDER_ENUM : PLACEHOLDER_MESSAGE,
-                   LOOKUP_TYPES);
+    // In case of weak fields we force building the dependency. We need to know
+    // if the type exist or not. If it doesnt exist we substitute Empty which
+    // should only be done if the type can't be found in the generated pool.
+    // TODO(gerbens) Ideally we should query the database directly to check
+    // if weak fields exist or not so that we don't need to force building
+    // weak dependencies. However the name lookup rules for symbols are
+    // somewhat complicated, so I defer it too another CL.
+    bool is_weak = !pool_->enforce_weak_ && proto.options().weak();
+    bool is_lazy = pool_->lazily_build_dependencies_ && !is_weak;
 
-    // If the type is a weak type, we change the type to a google.protobuf.Empty field.
-    if (type.IsNull() && !pool_->enforce_weak_ && proto.options().weak()) {
-      type = FindSymbol(kNonLinkedWeakMessageReplacementName);
-    }
+    Symbol type =
+        LookupSymbol(proto.type_name(), field->full_name(),
+                     expecting_enum ? DescriptorPool::PLACEHOLDER_ENUM
+                                    : DescriptorPool::PLACEHOLDER_MESSAGE,
+                     LOOKUP_TYPES, !is_lazy);
 
     if (type.IsNull()) {
-      AddNotDefinedError(field->full_name(), proto,
-                         DescriptorPool::ErrorCollector::TYPE,
-                         proto.type_name());
-      return;
+      if (is_lazy) {
+        // Save the symbol names for later for lookup, and allocate the once
+        // object needed for the accessors.
+        string name = proto.type_name();
+        field->type_once_ = tables_->AllocateOnceDynamic();
+        field->type_name_ = tables_->AllocateString(name);
+        if (proto.has_default_value()) {
+          field->default_value_enum_name_ =
+              tables_->AllocateString(proto.default_value());
+        }
+        // AddFieldByNumber and AddExtension are done later in this function,
+        // and can/must be done if the field type was not found. The related
+        // error checking is not necessary when in lazily_build_dependencies_
+        // mode, and can't be done without building the type's descriptor,
+        // which we don't want to do.
+        file_tables_->AddFieldByNumber(field);
+        if (field->is_extension()) {
+          tables_->AddExtension(field);
+        }
+        return;
+      } else {
+        // If the type is a weak type, we change the type to a google.protobuf.Empty
+        // field.
+        if (is_weak) {
+          type = FindSymbol(kNonLinkedWeakMessageReplacementName);
+        }
+        if (type.IsNull()) {
+          AddNotDefinedError(field->full_name(), proto,
+                             DescriptorPool::ErrorCollector::TYPE,
+                             proto.type_name());
+          return;
+        }
+      }
     }
 
     if (!proto.has_type()) {
@@ -5238,7 +5679,10 @@ void DescriptorBuilder::CrossLinkField(
 
   // Add the field to the fields-by-number table.
   // Note:  We have to do this *after* cross-linking because extensions do not
-  //   know their containing type until now.
+  // know their containing type until now. If we're in
+  // lazily_build_dependencies_ mode, we're guaranteed there's no errors, so no
+  // risk to calling containing_type() or other accessors that will build
+  // dependencies.
   if (!file_tables_->AddFieldByNumber(field)) {
     const FieldDescriptor* conflicting_field =
       file_tables_->FindFieldByNumber(field->containing_type(),
@@ -5268,13 +5712,15 @@ void DescriptorBuilder::CrossLinkField(
       if (!tables_->AddExtension(field)) {
         const FieldDescriptor* conflicting_field =
             tables_->FindExtension(field->containing_type(), field->number());
+        string containing_type_name =
+            field->containing_type() == NULL
+                ? "unknown"
+                : field->containing_type()->full_name();
         string error_msg = strings::Substitute(
             "Extension number $0 has already been used in \"$1\" by extension "
             "\"$2\" defined in $3.",
-            field->number(),
-            field->containing_type()->full_name(),
-            conflicting_field->full_name(),
-            conflicting_field->file()->name());
+            field->number(), containing_type_name,
+            conflicting_field->full_name(), conflicting_field->file()->name());
         // Conflicting extension numbers should be an error. However, before
         // turning this into an error we need to fix all existing broken
         // protos first.
@@ -5284,9 +5730,6 @@ void DescriptorBuilder::CrossLinkField(
       }
     }
   }
-
-  // Add the field to the lowercase-name and camelcase-name tables.
-  file_tables_->AddFieldByStylizedNames(field);
 }
 
 void DescriptorBuilder::CrossLinkEnum(
@@ -5325,30 +5768,44 @@ void DescriptorBuilder::CrossLinkMethod(
     method->options_ = &MethodOptions::default_instance();
   }
 
-  Symbol input_type = LookupSymbol(proto.input_type(), method->full_name());
+  Symbol input_type =
+      LookupSymbol(proto.input_type(), method->full_name(),
+                   DescriptorPool::PLACEHOLDER_MESSAGE, LOOKUP_ALL,
+                   !pool_->lazily_build_dependencies_);
   if (input_type.IsNull()) {
-    AddNotDefinedError(method->full_name(), proto,
-                       DescriptorPool::ErrorCollector::INPUT_TYPE,
-                       proto.input_type());
+    if (!pool_->lazily_build_dependencies_) {
+      AddNotDefinedError(method->full_name(), proto,
+                         DescriptorPool::ErrorCollector::INPUT_TYPE,
+                         proto.input_type());
+    } else {
+      method->input_type_.SetLazy(proto.input_type(), file_);
+    }
   } else if (input_type.type != Symbol::MESSAGE) {
     AddError(method->full_name(), proto,
              DescriptorPool::ErrorCollector::INPUT_TYPE,
              "\"" + proto.input_type() + "\" is not a message type.");
   } else {
-    method->input_type_ = input_type.descriptor;
+    method->input_type_.Set(input_type.descriptor);
   }
 
-  Symbol output_type = LookupSymbol(proto.output_type(), method->full_name());
+  Symbol output_type =
+      LookupSymbol(proto.output_type(), method->full_name(),
+                   DescriptorPool::PLACEHOLDER_MESSAGE, LOOKUP_ALL,
+                   !pool_->lazily_build_dependencies_);
   if (output_type.IsNull()) {
-    AddNotDefinedError(method->full_name(), proto,
-                       DescriptorPool::ErrorCollector::OUTPUT_TYPE,
-                       proto.output_type());
+    if (!pool_->lazily_build_dependencies_) {
+      AddNotDefinedError(method->full_name(), proto,
+                         DescriptorPool::ErrorCollector::OUTPUT_TYPE,
+                         proto.output_type());
+    } else {
+      method->output_type_.SetLazy(proto.output_type(), file_);
+    }
   } else if (output_type.type != Symbol::MESSAGE) {
     AddError(method->full_name(), proto,
              DescriptorPool::ErrorCollector::OUTPUT_TYPE,
              "\"" + proto.output_type() + "\" is not a message type.");
   } else {
-    method->output_type_ = output_type.descriptor;
+    method->output_type_.Set(output_type.descriptor);
   }
 }
 
@@ -5539,8 +5996,12 @@ void DescriptorBuilder::ValidateMessageOptions(Descriptor* message,
   }
 }
 
+
 void DescriptorBuilder::ValidateFieldOptions(FieldDescriptor* field,
     const FieldDescriptorProto& proto) {
+  if (pool_->lazily_build_dependencies_ && (!field || !field->message_type())) {
+    return;
+  }
   // Only message type fields may be lazy.
   if (field->options().lazy()) {
     if (field->type() != FieldDescriptor::TYPE_MESSAGE) {
@@ -5599,6 +6060,8 @@ void DescriptorBuilder::ValidateFieldOptions(FieldDescriptor* field,
     }
   }
 
+  ValidateJSType(field, proto);
+
 }
 
 void DescriptorBuilder::ValidateEnumOptions(EnumDescriptor* enm,
@@ -5787,6 +6250,40 @@ void DescriptorBuilder::DetectMapConflicts(const Descriptor* message,
   }
 }
 
+void DescriptorBuilder::ValidateJSType(FieldDescriptor* field,
+                                       const FieldDescriptorProto& proto) {
+  FieldOptions::JSType jstype = field->options().jstype();
+  // The default is always acceptable.
+  if (jstype == FieldOptions::JS_NORMAL) {
+    return;
+  }
+
+  switch (field->type()) {
+    // Integral 64-bit types may be represented as JavaScript numbers or
+    // strings.
+    case FieldDescriptor::TYPE_UINT64:
+    case FieldDescriptor::TYPE_INT64:
+    case FieldDescriptor::TYPE_SINT64:
+    case FieldDescriptor::TYPE_FIXED64:
+    case FieldDescriptor::TYPE_SFIXED64:
+      if (jstype == FieldOptions::JS_STRING ||
+          jstype == FieldOptions::JS_NUMBER) {
+        return;
+      }
+      AddError(field->full_name(), proto, DescriptorPool::ErrorCollector::TYPE,
+               "Illegal jstype for int64, uint64, sint64, fixed64 "
+               "or sfixed64 field: " +
+               FieldOptions_JSType_descriptor()->value(jstype)->name());
+      break;
+
+    // No other types permit a jstype option.
+    default:
+      AddError(field->full_name(), proto, DescriptorPool::ErrorCollector::TYPE,
+               "jstype is only allowed on int64, uint64, sint64, fixed64 "
+               "or sfixed64 fields.");
+      break;
+  }
+}
 
 #undef VALIDATE_OPTIONS_FROM_ARRAY
 
@@ -5818,6 +6315,9 @@ bool DescriptorBuilder::OptionInterpreter::InterpretOptions(
       << "No field named \"uninterpreted_option\" in the Options proto.";
   options->GetReflection()->ClearField(options, uninterpreted_options_field);
 
+  std::vector<int> src_path = options_to_interpret->element_path;
+  src_path.push_back(uninterpreted_options_field->number());
+
   // Find the uninterpreted_option field in the original options.
   const FieldDescriptor* original_uninterpreted_options_field =
       original_options->GetDescriptor()->
@@ -5828,14 +6328,17 @@ bool DescriptorBuilder::OptionInterpreter::InterpretOptions(
   const int num_uninterpreted_options = original_options->GetReflection()->
       FieldSize(*original_options, original_uninterpreted_options_field);
   for (int i = 0; i < num_uninterpreted_options; ++i) {
+    src_path.push_back(i);
     uninterpreted_option_ = down_cast<const UninterpretedOption*>(
         &original_options->GetReflection()->GetRepeatedMessage(
             *original_options, original_uninterpreted_options_field, i));
-    if (!InterpretSingleOption(options)) {
+    if (!InterpretSingleOption(options, src_path,
+                               options_to_interpret->element_path)) {
       // Error already added by InterpretSingleOption().
       failed = true;
       break;
     }
+    src_path.pop_back();
   }
   // Reset these, so we don't have any dangling pointers.
   uninterpreted_option_ = NULL;
@@ -5868,7 +6371,7 @@ bool DescriptorBuilder::OptionInterpreter::InterpretOptions(
 }
 
 bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
-    Message* options) {
+    Message* options, std::vector<int>& src_path, std::vector<int>& opts_path) {
   // First do some basic validation.
   if (uninterpreted_option_->name_size() == 0) {
     // This should never happen unless the parser has gone seriously awry or
@@ -5914,6 +6417,8 @@ bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
   std::vector<const FieldDescriptor*> intermediate_fields;
   string debug_msg_name = "";
 
+  std::vector<int> dest_path = opts_path;
+
   for (int i = 0; i < uninterpreted_option_->name_size(); ++i) {
     const string& name_part = uninterpreted_option_->name(i).name_part();
     if (debug_msg_name.size() > 0) {
@@ -5976,19 +6481,24 @@ bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
                             "\" is not a field or extension of message \"" +
                             descriptor->name() + "\".");
       }
-    } else if (i < uninterpreted_option_->name_size() - 1) {
-      if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) {
-        return AddNameError("Option \"" +  debug_msg_name +
-                            "\" is an atomic type, not a message.");
-      } else if (field->is_repeated()) {
-        return AddNameError("Option field \"" + debug_msg_name +
-                            "\" is a repeated message. Repeated message "
-                            "options must be initialized using an "
-                            "aggregate value.");
-      } else {
-        // Drill down into the submessage.
-        intermediate_fields.push_back(field);
-        descriptor = field->message_type();
+    } else {
+      // accumulate field numbers to form path to interpreted option
+      dest_path.push_back(field->number());
+
+      if (i < uninterpreted_option_->name_size() - 1) {
+        if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) {
+          return AddNameError("Option \"" +  debug_msg_name +
+                              "\" is an atomic type, not a message.");
+        } else if (field->is_repeated()) {
+          return AddNameError("Option field \"" + debug_msg_name +
+                              "\" is a repeated message. Repeated message "
+                              "options must be initialized using an "
+                              "aggregate value.");
+        } else {
+          // Drill down into the submessage.
+          intermediate_fields.push_back(field);
+          descriptor = field->message_type();
+        }
       }
     }
   }
@@ -6009,10 +6519,9 @@ bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
     return false;  // ExamineIfOptionIsSet() already added the error.
   }
 
-
   // First set the value on the UnknownFieldSet corresponding to the
   // innermost message.
-  google::protobuf::scoped_ptr<UnknownFieldSet> unknown_fields(new UnknownFieldSet());
+  std::unique_ptr<UnknownFieldSet> unknown_fields(new UnknownFieldSet());
   if (!SetOptionValue(field, unknown_fields.get())) {
     return false;  // SetOptionValue() already added the error.
   }
@@ -6022,7 +6531,7 @@ bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
   for (std::vector<const FieldDescriptor*>::reverse_iterator iter =
            intermediate_fields.rbegin();
        iter != intermediate_fields.rend(); ++iter) {
-    google::protobuf::scoped_ptr<UnknownFieldSet> parent_unknown_fields(
+    std::unique_ptr<UnknownFieldSet> parent_unknown_fields(
         new UnknownFieldSet());
     switch ((*iter)->type()) {
       case FieldDescriptor::TYPE_MESSAGE: {
@@ -6055,9 +6564,110 @@ bool DescriptorBuilder::OptionInterpreter::InterpretSingleOption(
   options->GetReflection()->MutableUnknownFields(options)->MergeFrom(
       *unknown_fields);
 
+  // record the element path of the interpreted option
+  if (field->is_repeated()) {
+    int index = repeated_option_counts_[dest_path]++;
+    dest_path.push_back(index);
+  }
+  interpreted_paths_[src_path] = dest_path;
+
   return true;
 }
 
+void DescriptorBuilder::OptionInterpreter::UpdateSourceCodeInfo(
+    SourceCodeInfo* info) {
+
+  if (interpreted_paths_.empty()) {
+    // nothing to do!
+    return;
+  }
+
+  // We find locations that match keys in interpreted_paths_ and
+  // 1) replace the path with the corresponding value in interpreted_paths_
+  // 2) remove any subsequent sub-locations (sub-location is one whose path
+  //    has the parent path as a prefix)
+  //
+  // To avoid quadratic behavior of removing interior rows as we go,
+  // we keep a copy. But we don't actually copy anything until we've
+  // found the first match (so if the source code info has no locations
+  // that need to be changed, there is zero copy overhead).
+
+  RepeatedPtrField<SourceCodeInfo_Location>* locs = info->mutable_location();
+  RepeatedPtrField<SourceCodeInfo_Location> new_locs;
+  bool copying = false;
+
+  std::vector<int> pathv;
+  bool matched = false;
+
+  for (RepeatedPtrField<SourceCodeInfo_Location>::iterator loc = locs->begin();
+       loc != locs->end(); loc++) {
+
+    if (matched) {
+      // see if this location is in the range to remove
+      bool loc_matches = true;
+      if (loc->path_size() < pathv.size()) {
+        loc_matches = false;
+      } else {
+        for (int j = 0; j < pathv.size(); j++) {
+          if (loc->path(j) != pathv[j]) {
+            loc_matches = false;
+            break;
+          }
+        }
+      }
+
+      if (loc_matches) {
+        // don't copy this row since it is a sub-location that we're removing
+        continue;
+      }
+
+      matched = false;
+    }
+
+    pathv.clear();
+    for (int j = 0; j < loc->path_size(); j++) {
+      pathv.push_back(loc->path(j));
+    }
+
+    std::map<std::vector<int>, std::vector<int>>::iterator entry =
+        interpreted_paths_.find(pathv);
+
+    if (entry == interpreted_paths_.end()) {
+      // not a match
+      if (copying) {
+        new_locs.Add()->CopyFrom(*loc);
+      }
+      continue;
+    }
+
+    matched = true;
+
+    if (!copying) {
+      // initialize the copy we are building
+      copying = true;
+      new_locs.Reserve(locs->size());
+      for (RepeatedPtrField<SourceCodeInfo_Location>::iterator it =
+           locs->begin(); it != loc; it++) {
+        new_locs.Add()->CopyFrom(*it);
+      }
+    }
+
+    // add replacement and update its path
+    SourceCodeInfo_Location* replacement = new_locs.Add();
+    replacement->CopyFrom(*loc);
+    replacement->clear_path();
+    for (std::vector<int>::iterator rit = entry->second.begin();
+         rit != entry->second.end(); rit++) {
+      replacement->add_path(*rit);
+    }
+  }
+
+  // if we made a changed copy, put it in place
+  if (copying) {
+    *locs = new_locs;
+  }
+}
+
 void DescriptorBuilder::OptionInterpreter::AddWithoutInterpreting(
     const UninterpretedOption& uninterpreted_option, Message* options) {
   const FieldDescriptor* field =
@@ -6410,7 +7020,7 @@ bool DescriptorBuilder::OptionInterpreter::SetAggregateOption(
   }
 
   const Descriptor* type = option_field->message_type();
-  google::protobuf::scoped_ptr<Message> dynamic(dynamic_factory_.GetPrototype(type)->New());
+  std::unique_ptr<Message> dynamic(dynamic_factory_.GetPrototype(type)->New());
   GOOGLE_CHECK(dynamic.get() != NULL)
       << "Could not create an instance of " << option_field->DebugString();
 
@@ -6528,6 +7138,7 @@ void DescriptorBuilder::LogUnusedDependency(const FileDescriptorProto& proto,
     annotation_extensions.insert("google.protobuf.FieldOptions");
     annotation_extensions.insert("google.protobuf.EnumOptions");
     annotation_extensions.insert("google.protobuf.EnumValueOptions");
+    annotation_extensions.insert("google.protobuf.EnumValueOptions");
     annotation_extensions.insert("google.protobuf.ServiceOptions");
     annotation_extensions.insert("google.protobuf.MethodOptions");
     annotation_extensions.insert("google.protobuf.StreamOptions");
@@ -6553,5 +7164,158 @@ void DescriptorBuilder::LogUnusedDependency(const FileDescriptorProto& proto,
   }
 }
 
+Symbol DescriptorPool::CrossLinkOnDemandHelper(const string& name,
+                                               bool expecting_enum) const {
+  string lookup_name = name;
+  if (!lookup_name.empty() && lookup_name[0] == '.') {
+    lookup_name = lookup_name.substr(1);
+  }
+  Symbol result = tables_->FindByNameHelper(this, lookup_name);
+  return result;
+}
+
+// Handle the lazy import building for a message field whose type wasn't built
+// at cross link time. If that was the case, we saved the name of the type to
+// be looked up when the accessor for the type was called. Set type_,
+// enum_type_, message_type_, and default_value_enum_ appropriately.
+void FieldDescriptor::InternalTypeOnceInit() const {
+  GOOGLE_CHECK(file()->finished_building_ == true);
+  if (type_name_) {
+    Symbol result = file()->pool()->CrossLinkOnDemandHelper(
+        *type_name_, type_ == FieldDescriptor::TYPE_ENUM);
+    if (result.type == Symbol::MESSAGE) {
+      type_ = FieldDescriptor::TYPE_MESSAGE;
+      message_type_ = result.descriptor;
+    } else if (result.type == Symbol::ENUM) {
+      type_ = FieldDescriptor::TYPE_ENUM;
+      enum_type_ = result.enum_descriptor;
+    }
+  }
+  if (enum_type_ && !default_value_enum_) {
+    if (default_value_enum_name_) {
+      // Have to build the full name now instead of at CrossLink time,
+      // because enum_type_ may not be known at the time.
+      string name = enum_type_->full_name();
+      // Enum values reside in the same scope as the enum type.
+      string::size_type last_dot = name.find_last_of('.');
+      if (last_dot != string::npos) {
+        name = name.substr(0, last_dot) + "." + *default_value_enum_name_;
+      } else {
+        name = *default_value_enum_name_;
+      }
+      Symbol result = file()->pool()->CrossLinkOnDemandHelper(name, true);
+      if (result.type == Symbol::ENUM_VALUE) {
+        default_value_enum_ = result.enum_value_descriptor;
+      }
+    }
+    if (!default_value_enum_) {
+      // We use the first defined value as the default
+      // if a default is not explicitly defined.
+      GOOGLE_CHECK(enum_type_->value_count());
+      default_value_enum_ = enum_type_->value(0);
+    }
+  }
+}
+
+void FieldDescriptor::TypeOnceInit(const FieldDescriptor* to_init) {
+  to_init->InternalTypeOnceInit();
+}
+
+// message_type(), enum_type(), default_value_enum(), and type()
+// all share the same GoogleOnceDynamic init path to do lazy
+// import building and cross linking of a field of a message.
+const Descriptor* FieldDescriptor::message_type() const {
+  if (type_once_) {
+    type_once_->Init(&FieldDescriptor::TypeOnceInit, this);
+  }
+  return message_type_;
+}
+
+const EnumDescriptor* FieldDescriptor::enum_type() const {
+  if (type_once_) {
+    type_once_->Init(&FieldDescriptor::TypeOnceInit, this);
+  }
+  return enum_type_;
+}
+
+const EnumValueDescriptor* FieldDescriptor::default_value_enum() const {
+  if (type_once_) {
+    type_once_->Init(&FieldDescriptor::TypeOnceInit, this);
+  }
+  return default_value_enum_;
+}
+
+void FileDescriptor::InternalDependenciesOnceInit() const {
+  GOOGLE_CHECK(finished_building_ == true);
+  for (int i = 0; i < dependency_count(); i++) {
+    if (dependencies_names_[i]) {
+      dependencies_[i] = pool_->FindFileByName(*dependencies_names_[i]);
+    }
+  }
+}
+
+void FileDescriptor::DependenciesOnceInit(const FileDescriptor* to_init) {
+  to_init->InternalDependenciesOnceInit();
+}
+
+const FileDescriptor* FileDescriptor::dependency(int index) const {
+  if (dependencies_once_) {
+    // Do once init for all indicies, as it's unlikely only a single index would
+    // be called, and saves on GoogleOnceDynamic allocations.
+    dependencies_once_->Init(&FileDescriptor::DependenciesOnceInit, this);
+  }
+  return dependencies_[index];
+}
+
+const Descriptor* MethodDescriptor::input_type() const {
+  return input_type_.Get();
+}
+
+const Descriptor* MethodDescriptor::output_type() const {
+  return output_type_.Get();
+}
+
+
+namespace internal {
+void LazyDescriptor::Set(const Descriptor* descriptor) {
+  GOOGLE_CHECK(!name_);
+  GOOGLE_CHECK(!once_);
+  GOOGLE_CHECK(!file_);
+  descriptor_ = descriptor;
+}
+
+void LazyDescriptor::SetLazy(const string& name, const FileDescriptor* file) {
+  // verify Init() has been called and Set hasn't been called yet.
+  GOOGLE_CHECK(!descriptor_);
+  GOOGLE_CHECK(!file_);
+  GOOGLE_CHECK(!name_);
+  GOOGLE_CHECK(!once_);
+  GOOGLE_CHECK(file && file->pool_);
+  GOOGLE_CHECK(file->pool_->lazily_build_dependencies_);
+  GOOGLE_CHECK(!file->finished_building_);
+  file_ = file;
+  name_ = file->pool_->tables_->AllocateString(name);
+  once_ = file->pool_->tables_->AllocateOnceDynamic();
+}
+
+void LazyDescriptor::Once() {
+  if (once_) {
+    once_->Init(&LazyDescriptor::OnceStatic, this);
+  }
+}
+
+void LazyDescriptor::OnceStatic(LazyDescriptor* lazy) { lazy->OnceInternal(); }
+
+void LazyDescriptor::OnceInternal() {
+  GOOGLE_CHECK(file_->finished_building_);
+  if (!descriptor_ && name_) {
+    Symbol result = file_->pool_->CrossLinkOnDemandHelper(*name_, false);
+    if (!result.IsNull() && result.type == Symbol::MESSAGE) {
+      descriptor_ = result.descriptor;
+    }
+  }
+}
+}  // namespace internal
+
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/descriptor.h b/src/google/protobuf/descriptor.h
index cc099693..115d4ddc 100644
--- a/src/google/protobuf/descriptor.h
+++ b/src/google/protobuf/descriptor.h
@@ -55,14 +55,12 @@
 #define GOOGLE_PROTOBUF_DESCRIPTOR_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
 #include <string>
 #include <vector>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/mutex.h>
+#include <google/protobuf/stubs/once.h>
 
 // TYPE_BOOL is defined in the MacOS's ConditionalMacros.h.
 #ifdef TYPE_BOOL
@@ -86,6 +84,7 @@ class DescriptorPool;
 
 // Defined in descriptor.proto
 class DescriptorProto;
+class DescriptorProto_ExtensionRange;
 class FieldDescriptorProto;
 class OneofDescriptorProto;
 class EnumDescriptorProto;
@@ -98,6 +97,7 @@ class FieldOptions;
 class OneofOptions;
 class EnumOptions;
 class EnumValueOptions;
+class ExtensionRangeOptions;
 class ServiceOptions;
 class MethodOptions;
 class FileOptions;
@@ -110,6 +110,7 @@ class Message;
 // Defined in descriptor.cc
 class DescriptorBuilder;
 class FileDescriptorTables;
+struct Symbol;
 
 // Defined in unknown_field_set.h.
 class UnknownField;
@@ -165,6 +166,55 @@ struct DebugStringOptions {
         elide_oneof_body(false) {}
 };
 
+// A class to handle the simplest cases of a lazily linked descriptor
+// for a message type that isn't built at the time of cross linking,
+// which is needed when a pool has lazily_build_dependencies_ set.
+// Must be instantiated as mutable in a descriptor.
+namespace internal {
+class LIBPROTOBUF_EXPORT LazyDescriptor {
+ public:
+  // Init function to be called at init time of a descriptor containing
+  // a LazyDescriptor.
+  void Init() {
+    descriptor_ = NULL;
+    name_ = NULL;
+    once_ = NULL;
+    file_ = NULL;
+  }
+
+  // Sets the value of the descriptor if it is known during the descriptor
+  // building process. Not thread safe, should only be called during the
+  // descriptor build process. Should not be called after SetLazy has been
+  // called.
+  void Set(const Descriptor* descriptor);
+
+  // Sets the information needed to lazily cross link the descriptor at a later
+  // time, SetLazy is not thread safe, should be called only once at descriptor
+  // build time if the symbol wasn't found and building of the file containing
+  // that type is delayed because lazily_build_dependencies_ is set on the pool.
+  // Should not be called after Set() has been called.
+  void SetLazy(const string& name, const FileDescriptor* file);
+
+  // Returns the current value of the descriptor, thread-safe. If SetLazy(...)
+  // has been called, will do a one-time cross link of the type specified,
+  // building the descriptor file that contains the type if necessary.
+  inline const Descriptor* Get() {
+    Once();
+    return descriptor_;
+  }
+
+ private:
+  static void OnceStatic(LazyDescriptor* lazy);
+  void OnceInternal();
+  void Once();
+
+  const Descriptor* descriptor_;
+  const string* name_;
+  GoogleOnceDynamic* once_;
+  const FileDescriptor* file_;
+};
+}  // namespace internal
+
 // Describes a type of protocol message, or a particular group within a
 // message.  To obtain the Descriptor for a given message object, call
 // Message::GetDescriptor().  Generated message classes also have a
@@ -286,8 +336,15 @@ class LIBPROTOBUF_EXPORT Descriptor {
   // A range of field numbers which are designated for third-party
   // extensions.
   struct ExtensionRange {
+    typedef ExtensionRangeOptions OptionsType;
+
+    // See Descriptor::CopyTo().
+    void CopyTo(DescriptorProto_ExtensionRange* proto) const;
+
     int start;  // inclusive
     int end;    // exclusive
+
+    const ExtensionRangeOptions* options_;
   };
 
   // The number of extension ranges in this message type.
@@ -389,27 +446,30 @@ class LIBPROTOBUF_EXPORT Descriptor {
   const Descriptor* containing_type_;
   const MessageOptions* options_;
 
-  // True if this is a placeholder for an unknown type.
-  bool is_placeholder_;
-  // True if this is a placeholder and the type name wasn't fully-qualified.
-  bool is_unqualified_placeholder_;
+  // These arrays are separated from their sizes to minimize padding on 64-bit.
+  FieldDescriptor* fields_;
+  OneofDescriptor* oneof_decls_;
+  Descriptor* nested_types_;
+  EnumDescriptor* enum_types_;
+  ExtensionRange* extension_ranges_;
+  FieldDescriptor* extensions_;
+  ReservedRange* reserved_ranges_;
+  const string** reserved_names_;
 
   int field_count_;
-  FieldDescriptor* fields_;
   int oneof_decl_count_;
-  OneofDescriptor* oneof_decls_;
   int nested_type_count_;
-  Descriptor* nested_types_;
   int enum_type_count_;
-  EnumDescriptor* enum_types_;
   int extension_range_count_;
-  ExtensionRange* extension_ranges_;
   int extension_count_;
-  FieldDescriptor* extensions_;
   int reserved_range_count_;
-  ReservedRange* reserved_ranges_;
   int reserved_name_count_;
-  const string** reserved_names_;
+
+  // True if this is a placeholder for an unknown type.
+  bool is_placeholder_;
+  // True if this is a placeholder and the type name wasn't fully-qualified.
+  bool is_unqualified_placeholder_;
+
   // IMPORTANT:  If you add a new field, make sure to search for all instances
   // of Allocate<Descriptor>() and AllocateArray<Descriptor>() in descriptor.cc
   // and update them to initialize the field.
@@ -417,6 +477,7 @@ class LIBPROTOBUF_EXPORT Descriptor {
   // Must be constructed using DescriptorPool.
   Descriptor() {}
   friend class DescriptorBuilder;
+  friend class DescriptorPool;
   friend class EnumDescriptor;
   friend class FieldDescriptor;
   friend class OneofDescriptor;
@@ -425,6 +486,7 @@ class LIBPROTOBUF_EXPORT Descriptor {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Descriptor);
 };
 
+
 // Describes a single field of a message.  To get the descriptor for a given
 // field, first get the Descriptor for the message in which it is defined,
 // then call Descriptor::FindFieldByName().  To get a FieldDescriptor for
@@ -680,33 +742,41 @@ class LIBPROTOBUF_EXPORT FieldDescriptor {
   // to this descriptor from the file root.
   void GetLocationPath(std::vector<int>* output) const;
 
+  // Returns true if this is a map message type.
+  bool is_map_message_type() const;
+
   const string* name_;
   const string* full_name_;
   const string* lowercase_name_;
   const string* camelcase_name_;
-  // Whether the user has specified the json_name field option in the .proto
-  // file.
-  bool has_json_name_;
   // If has_json_name_ is true, it's the value specified by the user.
   // Otherwise, it has the same value as camelcase_name_.
   const string* json_name_;
   const FileDescriptor* file_;
-  int number_;
-  Type type_;
+  GoogleOnceDynamic* type_once_;
+  static void TypeOnceInit(const FieldDescriptor* to_init);
+  void InternalTypeOnceInit() const;
+  mutable Type type_;
   Label label_;
+  bool has_default_value_;
+  // Whether the user has specified the json_name field option in the .proto
+  // file.
+  bool has_json_name_;
   bool is_extension_;
+  int number_;
   int index_in_oneof_;
   const Descriptor* containing_type_;
   const OneofDescriptor* containing_oneof_;
   const Descriptor* extension_scope_;
-  const Descriptor* message_type_;
-  const EnumDescriptor* enum_type_;
+  mutable const Descriptor* message_type_;
+  mutable const EnumDescriptor* enum_type_;
   const FieldOptions* options_;
+  const string* type_name_;
+  const string* default_value_enum_name_;
   // IMPORTANT:  If you add a new field, make sure to search for all instances
   // of Allocate<FieldDescriptor>() and AllocateArray<FieldDescriptor>() in
   // descriptor.cc and update them to initialize the field.
 
-  bool has_default_value_;
   union {
     int32  default_value_int32_;
     int64  default_value_int64_;
@@ -716,7 +786,7 @@ class LIBPROTOBUF_EXPORT FieldDescriptor {
     double default_value_double_;
     bool   default_value_bool_;
 
-    const EnumValueDescriptor* default_value_enum_;
+    mutable const EnumValueDescriptor* default_value_enum_;
     const string* default_value_string_;
   };
 
@@ -737,6 +807,7 @@ class LIBPROTOBUF_EXPORT FieldDescriptor {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldDescriptor);
 };
 
+
 // Describes a oneof defined in a message type.
 class LIBPROTOBUF_EXPORT OneofDescriptor {
  public:
@@ -746,6 +817,8 @@ class LIBPROTOBUF_EXPORT OneofDescriptor {
   // Index of this oneof within the message's oneof array.
   int index() const;
 
+  // The .proto file in which this oneof was defined.  Never NULL.
+  const FileDescriptor* file() const;
   // The Descriptor for the message containing this oneof.
   const Descriptor* containing_type() const;
 
@@ -855,12 +928,42 @@ class LIBPROTOBUF_EXPORT EnumDescriptor {
   // See Descriptor::DebugStringWithOptions().
   string DebugStringWithOptions(const DebugStringOptions& options) const;
 
-
   // Returns true if this is a placeholder for an unknown enum. This will
   // only be the case if this descriptor comes from a DescriptorPool
   // with AllowUnknownDependencies() set.
   bool is_placeholder() const;
 
+  // Reserved fields -------------------------------------------------
+
+  // A range of reserved field numbers.
+  struct ReservedRange {
+    int start;  // inclusive
+    int end;    // inclusive
+  };
+
+  // The number of reserved ranges in this message type.
+  int reserved_range_count() const;
+  // Gets an reserved range by index, where 0 <= index <
+  // reserved_range_count(). These are returned in the order they were defined
+  // in the .proto file.
+  const EnumDescriptor::ReservedRange* reserved_range(int index) const;
+
+  // Returns true if the number is in one of the reserved ranges.
+  bool IsReservedNumber(int number) const;
+
+  // Returns NULL if no reserved range contains the given number.
+  const EnumDescriptor::ReservedRange*
+      FindReservedRangeContainingNumber(int number) const;
+
+  // The number of reserved field names in this message type.
+  int reserved_name_count() const;
+
+  // Gets a reserved name by index, where 0 <= index < reserved_name_count().
+  const string& reserved_name(int index) const;
+
+  // Returns true if the field name is reserved.
+  bool IsReservedName(const string& name) const;
+
   // Source Location ---------------------------------------------------
 
   // Updates |*out_location| to the source location of the complete
@@ -907,6 +1010,12 @@ class LIBPROTOBUF_EXPORT EnumDescriptor {
 
   int value_count_;
   EnumValueDescriptor* values_;
+
+  int reserved_range_count_;
+  int reserved_name_count_;
+  EnumDescriptor::ReservedRange* reserved_ranges_;
+  const string** reserved_names_;
+
   // IMPORTANT:  If you add a new field, make sure to search for all instances
   // of Allocate<EnumDescriptor>() and AllocateArray<EnumDescriptor>() in
   // descriptor.cc and update them to initialize the field.
@@ -918,6 +1027,7 @@ class LIBPROTOBUF_EXPORT EnumDescriptor {
   friend class FieldDescriptor;
   friend class EnumValueDescriptor;
   friend class FileDescriptor;
+  friend class DescriptorPool;
   friend class internal::GeneratedMessageReflection;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumDescriptor);
 };
@@ -940,6 +1050,8 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptor {
   // with C++ scoping rules for enums.
   const string& full_name() const;
 
+  // The .proto file in which this value was defined.  Never NULL.
+  const FileDescriptor* file() const;
   // The type of this value.  Never NULL.
   const EnumDescriptor* type() const;
 
@@ -994,6 +1106,7 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptor {
   EnumValueDescriptor() {}
   friend class DescriptorBuilder;
   friend class EnumDescriptor;
+  friend class DescriptorPool;
   friend class FileDescriptorTables;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumValueDescriptor);
 };
@@ -1063,8 +1176,8 @@ class LIBPROTOBUF_EXPORT ServiceDescriptor {
   const string* full_name_;
   const FileDescriptor* file_;
   const ServiceOptions* options_;
-  int method_count_;
   MethodDescriptor* methods_;
+  int method_count_;
   // IMPORTANT:  If you add a new field, make sure to search for all instances
   // of Allocate<ServiceDescriptor>() and AllocateArray<ServiceDescriptor>() in
   // descriptor.cc and update them to initialize the field.
@@ -1077,6 +1190,7 @@ class LIBPROTOBUF_EXPORT ServiceDescriptor {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ServiceDescriptor);
 };
 
+
 // Describes an individual service method.  To obtain a MethodDescriptor given
 // a service, first get its ServiceDescriptor, then call
 // ServiceDescriptor::FindMethodByName().  Use DescriptorPool to construct your
@@ -1090,6 +1204,8 @@ class LIBPROTOBUF_EXPORT MethodDescriptor {
   // Index within the service's Descriptor.
   int index() const;
 
+  // The .proto file in which this method was defined.  Never NULL.
+  const FileDescriptor* file() const;
   // Gets the service to which this method belongs.  Never NULL.
   const ServiceDescriptor* service() const;
 
@@ -1144,8 +1260,8 @@ class LIBPROTOBUF_EXPORT MethodDescriptor {
   const string* name_;
   const string* full_name_;
   const ServiceDescriptor* service_;
-  const Descriptor* input_type_;
-  const Descriptor* output_type_;
+  mutable internal::LazyDescriptor input_type_;
+  mutable internal::LazyDescriptor output_type_;
   const MethodOptions* options_;
   bool client_streaming_;
   bool server_streaming_;
@@ -1301,34 +1417,49 @@ class LIBPROTOBUF_EXPORT FileDescriptor {
   const string* name_;
   const string* package_;
   const DescriptorPool* pool_;
+  GoogleOnceDynamic* dependencies_once_;
+  static void DependenciesOnceInit(const FileDescriptor* to_init);
+  void InternalDependenciesOnceInit() const;
+
+  // These are arranged to minimze padding on 64-bit.
   int dependency_count_;
-  const FileDescriptor** dependencies_;
   int public_dependency_count_;
-  int* public_dependencies_;
   int weak_dependency_count_;
-  int* weak_dependencies_;
   int message_type_count_;
-  Descriptor* message_types_;
   int enum_type_count_;
-  EnumDescriptor* enum_types_;
   int service_count_;
-  ServiceDescriptor* services_;
   int extension_count_;
   Syntax syntax_;
   bool is_placeholder_;
+
+  // Indicates the FileDescriptor is completed building. Used to verify
+  // that type accessor functions that can possibly build a dependent file
+  // aren't called during the process of building the file.
+  bool finished_building_;
+
+  mutable const FileDescriptor** dependencies_;
+  const string** dependencies_names_;
+  int* public_dependencies_;
+  int* weak_dependencies_;
+  Descriptor* message_types_;
+  EnumDescriptor* enum_types_;
+  ServiceDescriptor* services_;
   FieldDescriptor* extensions_;
   const FileOptions* options_;
 
   const FileDescriptorTables* tables_;
   const SourceCodeInfo* source_code_info_;
+
   // IMPORTANT:  If you add a new field, make sure to search for all instances
   // of Allocate<FileDescriptor>() and AllocateArray<FileDescriptor>() in
   // descriptor.cc and update them to initialize the field.
 
   FileDescriptor() {}
   friend class DescriptorBuilder;
+  friend class DescriptorPool;
   friend class Descriptor;
   friend class FieldDescriptor;
+  friend class internal::LazyDescriptor;
   friend class OneofDescriptor;
   friend class EnumDescriptor;
   friend class EnumValueDescriptor;
@@ -1337,6 +1468,7 @@ class LIBPROTOBUF_EXPORT FileDescriptor {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FileDescriptor);
 };
 
+
 // ===================================================================
 
 // Used to construct descriptors.
@@ -1559,6 +1691,9 @@ class LIBPROTOBUF_EXPORT DescriptorPool {
   static void InternalAddGeneratedFile(
       const void* encoded_file_descriptor, int size);
 
+  // Disallow [enforce_utf8 = false] in .proto files.
+  void DisallowEnforceUtf8() { disallow_enforce_utf8_ = true; }
+
 
   // For internal use only:  Gets a non-const pointer to the generated pool.
   // This is called at static-initialization time only, so thread-safety is
@@ -1571,6 +1706,21 @@ class LIBPROTOBUF_EXPORT DescriptorPool {
   // which it did not officially declare as dependencies.
   void InternalDontEnforceDependencies();
 
+  // For internal use only: Enables lazy building of dependencies of a file.
+  // Delay the building of dependencies of a file descriptor until absolutely
+  // necessary, like when message_type() is called on a field that is defined
+  // in that dependency's file. This will cause functional issues if a proto
+  // or one of it's dependencies has errors. Should only be enabled for the
+  // generated_pool_ (because no descriptor build errors are guaranteed by
+  // the compilation generation process), testing, or if a lack of descriptor
+  // build errors can be guaranteed for a pool.
+  void InternalSetLazilyBuildDependencies() {
+    lazily_build_dependencies_ = true;
+    // This needs to be set when lazily building dependencies, as it breaks
+    // dependency checking.
+    InternalDontEnforceDependencies();
+  }
+
   // For internal use only.
   void internal_set_underlay(const DescriptorPool* underlay) {
     underlay_ = underlay;
@@ -1589,10 +1739,13 @@ class LIBPROTOBUF_EXPORT DescriptorPool {
 
  private:
   friend class Descriptor;
+  friend class internal::LazyDescriptor;
   friend class FieldDescriptor;
   friend class EnumDescriptor;
   friend class ServiceDescriptor;
+  friend class MethodDescriptor;
   friend class FileDescriptor;
+  friend class StreamDescriptor;
   friend class DescriptorBuilder;
   friend class FileDescriptorTables;
 
@@ -1616,6 +1769,28 @@ class LIBPROTOBUF_EXPORT DescriptorPool {
   const FileDescriptor* BuildFileFromDatabase(
     const FileDescriptorProto& proto) const;
 
+  // Helper for when lazily_build_dependencies_ is set, can look up a symbol
+  // after the file's descriptor is built, and can build the file where that
+  // symbol is defined if necessary. Will create a placeholder if the type
+  // doesn't exist in the fallback database, or the file doesn't build
+  // successfully.
+  Symbol CrossLinkOnDemandHelper(const string& name, bool expecting_enum) const;
+
+  // Create a placeholder FileDescriptor of the specified name
+  FileDescriptor* NewPlaceholderFile(const string& name) const;
+  FileDescriptor* NewPlaceholderFileWithMutexHeld(const string& name) const;
+
+  enum PlaceholderType {
+    PLACEHOLDER_MESSAGE,
+    PLACEHOLDER_ENUM,
+    PLACEHOLDER_EXTENDABLE_MESSAGE
+  };
+  // Create a placeholder Descriptor of the specified name
+  Symbol NewPlaceholder(const string& name,
+                        PlaceholderType placeholder_type) const;
+  Symbol NewPlaceholderWithMutexHeld(const string& name,
+                                     PlaceholderType placeholder_type) const;
+
   // If fallback_database_ is NULL, this is NULL.  Otherwise, this is a mutex
   // which must be locked while accessing tables_.
   Mutex* mutex_;
@@ -1628,16 +1803,19 @@ class LIBPROTOBUF_EXPORT DescriptorPool {
   // This class contains a lot of hash maps with complicated types that
   // we'd like to keep out of the header.
   class Tables;
-  google::protobuf::scoped_ptr<Tables> tables_;
+  std::unique_ptr<Tables> tables_;
 
   bool enforce_dependencies_;
+  bool lazily_build_dependencies_;
   bool allow_unknown_;
   bool enforce_weak_;
+  bool disallow_enforce_utf8_;
   std::set<string> unused_import_track_files_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DescriptorPool);
 };
 
+
 // inline methods ====================================================
 
 // These macros makes this repetitive code more readable.
@@ -1693,15 +1871,12 @@ PROTOBUF_DEFINE_STRING_ACCESSOR(FieldDescriptor, camelcase_name)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, file, const FileDescriptor*)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, number, int)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, is_extension, bool)
-PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, type, FieldDescriptor::Type)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, label, FieldDescriptor::Label)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, containing_type, const Descriptor*)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, containing_oneof,
                          const OneofDescriptor*)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, index_in_oneof, int)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, extension_scope, const Descriptor*)
-PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, message_type, const Descriptor*)
-PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, enum_type, const EnumDescriptor*)
 PROTOBUF_DEFINE_OPTIONS_ACCESSOR(FieldDescriptor, FieldOptions)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, has_default_value, bool)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, has_json_name, bool)
@@ -1712,8 +1887,6 @@ PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, default_value_uint64, uint64)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, default_value_float , float )
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, default_value_double, double)
 PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, default_value_bool  , bool  )
-PROTOBUF_DEFINE_ACCESSOR(FieldDescriptor, default_value_enum,
-                         const EnumValueDescriptor*)
 PROTOBUF_DEFINE_STRING_ACCESSOR(FieldDescriptor, default_value_string)
 
 PROTOBUF_DEFINE_STRING_ACCESSOR(OneofDescriptor, name)
@@ -1731,6 +1904,10 @@ PROTOBUF_DEFINE_ARRAY_ACCESSOR(EnumDescriptor, value,
                                const EnumValueDescriptor*)
 PROTOBUF_DEFINE_OPTIONS_ACCESSOR(EnumDescriptor, EnumOptions)
 PROTOBUF_DEFINE_ACCESSOR(EnumDescriptor, is_placeholder, bool)
+PROTOBUF_DEFINE_ACCESSOR(EnumDescriptor, reserved_range_count, int)
+PROTOBUF_DEFINE_ARRAY_ACCESSOR(EnumDescriptor, reserved_range,
+                               const EnumDescriptor::ReservedRange*)
+PROTOBUF_DEFINE_ACCESSOR(EnumDescriptor, reserved_name_count, int)
 
 PROTOBUF_DEFINE_STRING_ACCESSOR(EnumValueDescriptor, name)
 PROTOBUF_DEFINE_STRING_ACCESSOR(EnumValueDescriptor, full_name)
@@ -1749,8 +1926,6 @@ PROTOBUF_DEFINE_OPTIONS_ACCESSOR(ServiceDescriptor, ServiceOptions)
 PROTOBUF_DEFINE_STRING_ACCESSOR(MethodDescriptor, name)
 PROTOBUF_DEFINE_STRING_ACCESSOR(MethodDescriptor, full_name)
 PROTOBUF_DEFINE_ACCESSOR(MethodDescriptor, service, const ServiceDescriptor*)
-PROTOBUF_DEFINE_ACCESSOR(MethodDescriptor, input_type, const Descriptor*)
-PROTOBUF_DEFINE_ACCESSOR(MethodDescriptor, output_type, const Descriptor*)
 PROTOBUF_DEFINE_OPTIONS_ACCESSOR(MethodDescriptor, MethodOptions)
 PROTOBUF_DEFINE_ACCESSOR(MethodDescriptor, client_streaming, bool)
 PROTOBUF_DEFINE_ACCESSOR(MethodDescriptor, server_streaming, bool)
@@ -1804,6 +1979,32 @@ inline const string& Descriptor::reserved_name(int index) const {
   return *reserved_names_[index];
 }
 
+inline bool EnumDescriptor::IsReservedNumber(int number) const {
+  return FindReservedRangeContainingNumber(number) != NULL;
+}
+
+inline bool EnumDescriptor::IsReservedName(const string& name) const {
+  for (int i = 0; i < reserved_name_count(); i++) {
+    if (name == reserved_name(i)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// Can't use PROTOBUF_DEFINE_ARRAY_ACCESSOR because reserved_names_ is actually
+// an array of pointers rather than the usual array of objects.
+inline const string& EnumDescriptor::reserved_name(int index) const {
+  return *reserved_names_[index];
+}
+
+inline FieldDescriptor::Type FieldDescriptor::type() const {
+  if (type_once_) {
+    type_once_->Init(&FieldDescriptor::TypeOnceInit, this);
+  }
+  return type_;
+}
+
 inline bool FieldDescriptor::is_required() const {
   return label() == LABEL_REQUIRED;
 }
@@ -1820,11 +2021,15 @@ inline bool FieldDescriptor::is_packable() const {
   return is_repeated() && IsTypePackable(type());
 }
 
+inline bool FieldDescriptor::is_map() const {
+  return type() == TYPE_MESSAGE && is_map_message_type();
+}
+
 // To save space, index() is computed by looking at the descriptor's position
 // in the parent's array of children.
 inline int FieldDescriptor::index() const {
   if (!is_extension_) {
-    return static_cast<int>(this - containing_type_->fields_);
+    return static_cast<int>(this - containing_type()->fields_);
   } else if (extension_scope_ != NULL) {
     return static_cast<int>(this - extension_scope_->extensions_);
   } else {
@@ -1840,6 +2045,10 @@ inline int Descriptor::index() const {
   }
 }
 
+inline const FileDescriptor* OneofDescriptor::file() const {
+  return containing_type()->file();
+}
+
 inline int OneofDescriptor::index() const {
   return static_cast<int>(this - containing_type_->oneof_decls_);
 }
@@ -1852,6 +2061,10 @@ inline int EnumDescriptor::index() const {
   }
 }
 
+inline const FileDescriptor* EnumValueDescriptor::file() const {
+  return type()->file();
+}
+
 inline int EnumValueDescriptor::index() const {
   return static_cast<int>(this - type_->values_);
 }
@@ -1860,20 +2073,24 @@ inline int ServiceDescriptor::index() const {
   return static_cast<int>(this - file_->services_);
 }
 
+inline const FileDescriptor* MethodDescriptor::file() const {
+  return service()->file();
+}
+
 inline int MethodDescriptor::index() const {
   return static_cast<int>(this - service_->methods_);
 }
 
 inline const char* FieldDescriptor::type_name() const {
-  return kTypeToName[type_];
+  return kTypeToName[type()];
 }
 
 inline FieldDescriptor::CppType FieldDescriptor::cpp_type() const {
-  return kTypeToCppTypeMap[type_];
+  return kTypeToCppTypeMap[type()];
 }
 
 inline const char* FieldDescriptor::cpp_type_name() const {
-  return kCppTypeToName[kTypeToCppTypeMap[type_]];
+  return kCppTypeToName[kTypeToCppTypeMap[type()]];
 }
 
 inline FieldDescriptor::CppType FieldDescriptor::TypeToCppType(Type type) {
@@ -1895,18 +2112,14 @@ inline bool FieldDescriptor::IsTypePackable(Type field_type) {
           field_type != FieldDescriptor::TYPE_BYTES);
 }
 
-inline const FileDescriptor* FileDescriptor::dependency(int index) const {
-  return dependencies_[index];
-}
-
 inline const FileDescriptor* FileDescriptor::public_dependency(
     int index) const {
-  return dependencies_[public_dependencies_[index]];
+  return dependency(public_dependencies_[index]);
 }
 
 inline const FileDescriptor* FileDescriptor::weak_dependency(
     int index) const {
-  return dependencies_[weak_dependencies_[index]];
+  return dependency(weak_dependencies_[index]);
 }
 
 inline FileDescriptor::Syntax FileDescriptor::syntax() const {
diff --git a/src/google/protobuf/descriptor.pb.cc b/src/google/protobuf/descriptor.pb.cc
index 2a270d65..348f5d95 100644
--- a/src/google/protobuf/descriptor.pb.cc
+++ b/src/google/protobuf/descriptor.pb.cc
@@ -1,108 +1,662 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/descriptor.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/descriptor.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
+namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_DescriptorProto_ReservedRange;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_EnumDescriptorProto_EnumReservedRange;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_GeneratedCodeInfo_Annotation;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_SourceCodeInfo_Location;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_UninterpretedOption_NamePart;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_DescriptorProto_ExtensionRange;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_EnumOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValueDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValueOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_ExtensionRangeOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_FieldDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_FieldOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_FileOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_MessageOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_MethodDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_MethodOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_OneofDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_OneofOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_ServiceOptions;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_SourceCodeInfo;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_UninterpretedOption;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<2> scc_info_ServiceDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<3> scc_info_EnumDescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<6> scc_info_DescriptorProto;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto ::google::protobuf::internal::SCCInfo<6> scc_info_FileDescriptorProto;
+}  // namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto
 namespace google {
 namespace protobuf {
-class FileDescriptorSetDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FileDescriptorSet> {
+class FileDescriptorSetDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FileDescriptorSet>
+      _instance;
 } _FileDescriptorSet_default_instance_;
-class FileDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FileDescriptorProto> {
+class FileDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FileDescriptorProto>
+      _instance;
 } _FileDescriptorProto_default_instance_;
-class DescriptorProto_ExtensionRangeDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto_ExtensionRange> {
+class DescriptorProto_ExtensionRangeDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto_ExtensionRange>
+      _instance;
 } _DescriptorProto_ExtensionRange_default_instance_;
-class DescriptorProto_ReservedRangeDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto_ReservedRange> {
+class DescriptorProto_ReservedRangeDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto_ReservedRange>
+      _instance;
 } _DescriptorProto_ReservedRange_default_instance_;
-class DescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto> {
+class DescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<DescriptorProto>
+      _instance;
 } _DescriptorProto_default_instance_;
-class FieldDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FieldDescriptorProto> {
+class ExtensionRangeOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<ExtensionRangeOptions>
+      _instance;
+} _ExtensionRangeOptions_default_instance_;
+class FieldDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FieldDescriptorProto>
+      _instance;
 } _FieldDescriptorProto_default_instance_;
-class OneofDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<OneofDescriptorProto> {
+class OneofDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<OneofDescriptorProto>
+      _instance;
 } _OneofDescriptorProto_default_instance_;
-class EnumDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<EnumDescriptorProto> {
+class EnumDescriptorProto_EnumReservedRangeDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumDescriptorProto_EnumReservedRange>
+      _instance;
+} _EnumDescriptorProto_EnumReservedRange_default_instance_;
+class EnumDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumDescriptorProto>
+      _instance;
 } _EnumDescriptorProto_default_instance_;
-class EnumValueDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<EnumValueDescriptorProto> {
+class EnumValueDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumValueDescriptorProto>
+      _instance;
 } _EnumValueDescriptorProto_default_instance_;
-class ServiceDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<ServiceDescriptorProto> {
+class ServiceDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<ServiceDescriptorProto>
+      _instance;
 } _ServiceDescriptorProto_default_instance_;
-class MethodDescriptorProtoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<MethodDescriptorProto> {
+class MethodDescriptorProtoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<MethodDescriptorProto>
+      _instance;
 } _MethodDescriptorProto_default_instance_;
-class FileOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FileOptions> {
+class FileOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FileOptions>
+      _instance;
 } _FileOptions_default_instance_;
-class MessageOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<MessageOptions> {
+class MessageOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<MessageOptions>
+      _instance;
 } _MessageOptions_default_instance_;
-class FieldOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FieldOptions> {
+class FieldOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FieldOptions>
+      _instance;
 } _FieldOptions_default_instance_;
-class OneofOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<OneofOptions> {
+class OneofOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<OneofOptions>
+      _instance;
 } _OneofOptions_default_instance_;
-class EnumOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<EnumOptions> {
+class EnumOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumOptions>
+      _instance;
 } _EnumOptions_default_instance_;
-class EnumValueOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<EnumValueOptions> {
+class EnumValueOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumValueOptions>
+      _instance;
 } _EnumValueOptions_default_instance_;
-class ServiceOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<ServiceOptions> {
+class ServiceOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<ServiceOptions>
+      _instance;
 } _ServiceOptions_default_instance_;
-class MethodOptionsDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<MethodOptions> {
+class MethodOptionsDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<MethodOptions>
+      _instance;
 } _MethodOptions_default_instance_;
-class UninterpretedOption_NamePartDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<UninterpretedOption_NamePart> {
+class UninterpretedOption_NamePartDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<UninterpretedOption_NamePart>
+      _instance;
 } _UninterpretedOption_NamePart_default_instance_;
-class UninterpretedOptionDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<UninterpretedOption> {
+class UninterpretedOptionDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<UninterpretedOption>
+      _instance;
 } _UninterpretedOption_default_instance_;
-class SourceCodeInfo_LocationDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<SourceCodeInfo_Location> {
+class SourceCodeInfo_LocationDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<SourceCodeInfo_Location>
+      _instance;
 } _SourceCodeInfo_Location_default_instance_;
-class SourceCodeInfoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<SourceCodeInfo> {
+class SourceCodeInfoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<SourceCodeInfo>
+      _instance;
 } _SourceCodeInfo_default_instance_;
-class GeneratedCodeInfo_AnnotationDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<GeneratedCodeInfo_Annotation> {
+class GeneratedCodeInfo_AnnotationDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<GeneratedCodeInfo_Annotation>
+      _instance;
 } _GeneratedCodeInfo_Annotation_default_instance_;
-class GeneratedCodeInfoDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<GeneratedCodeInfo> {
+class GeneratedCodeInfoDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<GeneratedCodeInfo>
+      _instance;
 } _GeneratedCodeInfo_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto {
+static void InitDefaultsFileDescriptorSet() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_FileDescriptorSet_default_instance_;
+    new (ptr) ::google::protobuf::FileDescriptorSet();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FileDescriptorSet::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_FileDescriptorSet =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsFileDescriptorSet}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorProto.base,}};
 
-::google::protobuf::Metadata file_level_metadata[25];
-const ::google::protobuf::EnumDescriptor* file_level_enum_descriptors[6];
+static void InitDefaultsFileDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_FileDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::FileDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FileDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<6> scc_info_FileDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 6, InitDefaultsFileDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileOptions.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo.base,}};
+
+static void InitDefaultsDescriptorProto_ExtensionRange() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_DescriptorProto_ExtensionRange_default_instance_;
+    new (ptr) ::google::protobuf::DescriptorProto_ExtensionRange();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::DescriptorProto_ExtensionRange::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_DescriptorProto_ExtensionRange =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsDescriptorProto_ExtensionRange}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ExtensionRangeOptions.base,}};
+
+static void InitDefaultsDescriptorProto_ReservedRange() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_DescriptorProto_ReservedRange_default_instance_;
+    new (ptr) ::google::protobuf::DescriptorProto_ReservedRange();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::DescriptorProto_ReservedRange::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_DescriptorProto_ReservedRange =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsDescriptorProto_ReservedRange}, {}};
+
+static void InitDefaultsDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_DescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::DescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::DescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<6> scc_info_DescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 6, InitDefaultsDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ExtensionRange.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MessageOptions.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ReservedRange.base,}};
+
+static void InitDefaultsExtensionRangeOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_ExtensionRangeOptions_default_instance_;
+    new (ptr) ::google::protobuf::ExtensionRangeOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::ExtensionRangeOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_ExtensionRangeOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsExtensionRangeOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsFieldDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_FieldDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::FieldDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FieldDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_FieldDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsFieldDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldOptions.base,}};
+
+static void InitDefaultsOneofDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_OneofDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::OneofDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::OneofDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_OneofDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsOneofDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofOptions.base,}};
+
+static void InitDefaultsEnumDescriptorProto_EnumReservedRange() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumDescriptorProto_EnumReservedRange_default_instance_;
+    new (ptr) ::google::protobuf::EnumDescriptorProto_EnumReservedRange();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumDescriptorProto_EnumReservedRange::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_EnumDescriptorProto_EnumReservedRange =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsEnumDescriptorProto_EnumReservedRange}, {}};
+
+static void InitDefaultsEnumDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::EnumDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<3> scc_info_EnumDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 3, InitDefaultsEnumDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumOptions.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto_EnumReservedRange.base,}};
+
+static void InitDefaultsEnumValueDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumValueDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::EnumValueDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumValueDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValueDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsEnumValueDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueOptions.base,}};
+
+static void InitDefaultsServiceDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_ServiceDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::ServiceDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::ServiceDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<2> scc_info_ServiceDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 2, InitDefaultsServiceDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodDescriptorProto.base,
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceOptions.base,}};
+
+static void InitDefaultsMethodDescriptorProto() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_MethodDescriptorProto_default_instance_;
+    new (ptr) ::google::protobuf::MethodDescriptorProto();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::MethodDescriptorProto::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_MethodDescriptorProto =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsMethodDescriptorProto}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodOptions.base,}};
+
+static void InitDefaultsFileOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_FileOptions_default_instance_;
+    new (ptr) ::google::protobuf::FileOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FileOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_FileOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsFileOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsMessageOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_MessageOptions_default_instance_;
+    new (ptr) ::google::protobuf::MessageOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::MessageOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_MessageOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsMessageOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsFieldOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_FieldOptions_default_instance_;
+    new (ptr) ::google::protobuf::FieldOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FieldOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_FieldOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsFieldOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsOneofOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_OneofOptions_default_instance_;
+    new (ptr) ::google::protobuf::OneofOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::OneofOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_OneofOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsOneofOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsEnumOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumOptions_default_instance_;
+    new (ptr) ::google::protobuf::EnumOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_EnumOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsEnumOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsEnumValueOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumValueOptions_default_instance_;
+    new (ptr) ::google::protobuf::EnumValueOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumValueOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValueOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsEnumValueOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsServiceOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_ServiceOptions_default_instance_;
+    new (ptr) ::google::protobuf::ServiceOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::ServiceOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_ServiceOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsServiceOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsMethodOptions() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_MethodOptions_default_instance_;
+    new (ptr) ::google::protobuf::MethodOptions();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::MethodOptions::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_MethodOptions =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsMethodOptions}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base,}};
+
+static void InitDefaultsUninterpretedOption_NamePart() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_UninterpretedOption_NamePart_default_instance_;
+    new (ptr) ::google::protobuf::UninterpretedOption_NamePart();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::UninterpretedOption_NamePart::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_UninterpretedOption_NamePart =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsUninterpretedOption_NamePart}, {}};
+
+static void InitDefaultsUninterpretedOption() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_UninterpretedOption_default_instance_;
+    new (ptr) ::google::protobuf::UninterpretedOption();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::UninterpretedOption::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_UninterpretedOption =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsUninterpretedOption}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption_NamePart.base,}};
 
-}  // namespace
+static void InitDefaultsSourceCodeInfo_Location() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_SourceCodeInfo_Location_default_instance_;
+    new (ptr) ::google::protobuf::SourceCodeInfo_Location();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::SourceCodeInfo_Location::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_SourceCodeInfo_Location =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsSourceCodeInfo_Location}, {}};
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorSet, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorSet, _internal_metadata_),
+static void InitDefaultsSourceCodeInfo() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_SourceCodeInfo_default_instance_;
+    new (ptr) ::google::protobuf::SourceCodeInfo();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::SourceCodeInfo::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_SourceCodeInfo =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsSourceCodeInfo}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo_Location.base,}};
+
+static void InitDefaultsGeneratedCodeInfo_Annotation() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_GeneratedCodeInfo_Annotation_default_instance_;
+    new (ptr) ::google::protobuf::GeneratedCodeInfo_Annotation();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::GeneratedCodeInfo_Annotation::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_GeneratedCodeInfo_Annotation =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsGeneratedCodeInfo_Annotation}, {}};
+
+static void InitDefaultsGeneratedCodeInfo() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_GeneratedCodeInfo_default_instance_;
+    new (ptr) ::google::protobuf::GeneratedCodeInfo();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::GeneratedCodeInfo::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_GeneratedCodeInfo =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsGeneratedCodeInfo}, {
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo_Annotation.base,}};
+
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_FileDescriptorSet.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_FileDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_DescriptorProto_ExtensionRange.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_DescriptorProto_ReservedRange.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_DescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_ExtensionRangeOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_FieldDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_OneofDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumDescriptorProto_EnumReservedRange.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumValueDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_ServiceDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_MethodDescriptorProto.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_FileOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_MessageOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_FieldOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_OneofOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumValueOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_ServiceOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_MethodOptions.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_UninterpretedOption_NamePart.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_UninterpretedOption.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_SourceCodeInfo_Location.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_SourceCodeInfo.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_GeneratedCodeInfo_Annotation.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_GeneratedCodeInfo.base);
+}
+
+::google::protobuf::Metadata file_level_metadata[27];
+const ::google::protobuf::EnumDescriptor* file_level_enum_descriptors[6];
+
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorSet, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorSet, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorSet, file_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorSet, file_),
   ~0u,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, package_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, dependency_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, public_dependency_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, weak_dependency_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, message_type_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, enum_type_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, service_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, extension_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, source_code_info_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileDescriptorProto, syntax_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, package_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, dependency_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, public_dependency_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, weak_dependency_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, message_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, enum_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, service_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, extension_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, source_code_info_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileDescriptorProto, syntax_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ExtensionRange, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ExtensionRange, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ExtensionRange, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ExtensionRange, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ExtensionRange, start_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ExtensionRange, end_),
-  0,
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ExtensionRange, start_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ExtensionRange, end_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ExtensionRange, options_),
   1,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ReservedRange, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ReservedRange, _internal_metadata_),
+  2,
+  0,
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ReservedRange, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ReservedRange, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ReservedRange, start_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto_ReservedRange, end_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ReservedRange, start_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto_ReservedRange, end_),
   0,
   1,
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, _internal_metadata_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, field_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, extension_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, nested_type_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, reserved_range_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DescriptorProto, reserved_name_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, field_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, extension_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, nested_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, enum_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, extension_range_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DescriptorProto, reserved_name_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldDescriptorProto, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldDescriptorProto, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ExtensionRangeOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ExtensionRangeOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ExtensionRangeOptions, _extensions_),
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+  ~0u,  // no _weak_field_map_
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldDescriptorProto, _internal_metadata_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldDescriptorProto, json_name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldDescriptorProto, options_),
+  ~0u,  // no _weak_field_map_
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(OneofDescriptorProto, options_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumDescriptorProto, value_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceDescriptorProto, method_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceDescriptorProto, options_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceDescriptorProto, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceDescriptorProto, method_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, _internal_metadata_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, _internal_metadata_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, input_type_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, client_streaming_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodDescriptorProto, server_streaming_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, input_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, output_type_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, client_streaming_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodDescriptorProto, server_streaming_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, java_package_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, swift_prefix_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FileOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_package_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_outer_classname_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_multiple_files_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_generate_equals_and_hash_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_string_check_utf8_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, optimize_for_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, go_package_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, cc_generic_services_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, java_generic_services_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, py_generic_services_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, php_generic_services_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, cc_enable_arenas_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, objc_class_prefix_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, csharp_namespace_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, swift_prefix_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, php_class_prefix_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, php_namespace_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, php_metadata_namespace_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, ruby_package_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FileOptions, uninterpreted_option_),
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-  14,
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+  19,
+  2,
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+  14,
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+  17,
+  18,
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, message_set_wire_format_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, no_standard_descriptor_accessor_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, map_entry_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MessageOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, message_set_wire_format_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, no_standard_descriptor_accessor_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MessageOptions, map_entry_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, ctype_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, packed_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, weak_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, ctype_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, packed_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, jstype_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, lazy_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, weak_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldOptions, uninterpreted_option_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(OneofOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(OneofOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::OneofOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::OneofOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::OneofOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(OneofOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::OneofOptions, uninterpreted_option_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, allow_alias_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, deprecated_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, allow_alias_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumOptions, uninterpreted_option_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValueOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValueOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValueOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValueOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValueOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValueOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValueOptions, deprecated_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValueOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValueOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValueOptions, uninterpreted_option_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceOptions, deprecated_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ServiceOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ServiceOptions, uninterpreted_option_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, _internal_metadata_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, _extensions_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodOptions, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodOptions, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodOptions, _extensions_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, deprecated_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, idempotency_level_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MethodOptions, uninterpreted_option_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodOptions, deprecated_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::MethodOptions, idempotency_level_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption_NamePart, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption_NamePart, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption_NamePart, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption_NamePart, _internal_metadata_),
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   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption_NamePart, name_part_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption_NamePart, is_extension_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption_NamePart, name_part_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption_NamePart, is_extension_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, _internal_metadata_),
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   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption, name_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption, string_value_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UninterpretedOption, aggregate_value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, identifier_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, positive_int_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, negative_int_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, double_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, string_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UninterpretedOption, aggregate_value_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo_Location, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo_Location, _internal_metadata_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo_Location, _internal_metadata_),
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   ~0u,  // no _oneof_case_
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo_Location, trailing_comments_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo_Location, leading_detached_comments_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo_Location, path_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo_Location, span_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo_Location, leading_comments_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo_Location, trailing_comments_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo, _has_bits_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceCodeInfo, _internal_metadata_),
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+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceCodeInfo, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(GeneratedCodeInfo_Annotation, _has_bits_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(GeneratedCodeInfo_Annotation, begin_),
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-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(GeneratedCodeInfo, annotation_),
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-  { 270, 281, sizeof(UninterpretedOption)},
-  { 288, 297, sizeof(SourceCodeInfo_Location)},
-  { 302, 307, sizeof(SourceCodeInfo)},
-  { 308, 316, sizeof(GeneratedCodeInfo_Annotation)},
-  { 320, 325, sizeof(GeneratedCodeInfo)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, 6, sizeof(::google::protobuf::FileDescriptorSet)},
+  { 7, 24, sizeof(::google::protobuf::FileDescriptorProto)},
+  { 36, 44, sizeof(::google::protobuf::DescriptorProto_ExtensionRange)},
+  { 47, 54, sizeof(::google::protobuf::DescriptorProto_ReservedRange)},
+  { 56, 71, sizeof(::google::protobuf::DescriptorProto)},
+  { 81, 87, sizeof(::google::protobuf::ExtensionRangeOptions)},
+  { 88, 103, sizeof(::google::protobuf::FieldDescriptorProto)},
+  { 113, 120, sizeof(::google::protobuf::OneofDescriptorProto)},
+  { 122, 129, sizeof(::google::protobuf::EnumDescriptorProto_EnumReservedRange)},
+  { 131, 141, sizeof(::google::protobuf::EnumDescriptorProto)},
+  { 146, 154, sizeof(::google::protobuf::EnumValueDescriptorProto)},
+  { 157, 165, sizeof(::google::protobuf::ServiceDescriptorProto)},
+  { 168, 179, sizeof(::google::protobuf::MethodDescriptorProto)},
+  { 185, 211, sizeof(::google::protobuf::FileOptions)},
+  { 232, 242, sizeof(::google::protobuf::MessageOptions)},
+  { 247, 259, sizeof(::google::protobuf::FieldOptions)},
+  { 266, 272, sizeof(::google::protobuf::OneofOptions)},
+  { 273, 281, sizeof(::google::protobuf::EnumOptions)},
+  { 284, 291, sizeof(::google::protobuf::EnumValueOptions)},
+  { 293, 300, sizeof(::google::protobuf::ServiceOptions)},
+  { 302, 310, sizeof(::google::protobuf::MethodOptions)},
+  { 313, 320, sizeof(::google::protobuf::UninterpretedOption_NamePart)},
+  { 322, 334, sizeof(::google::protobuf::UninterpretedOption)},
+  { 341, 351, sizeof(::google::protobuf::SourceCodeInfo_Location)},
+  { 356, 362, sizeof(::google::protobuf::SourceCodeInfo)},
+  { 363, 372, sizeof(::google::protobuf::GeneratedCodeInfo_Annotation)},
+  { 376, 382, sizeof(::google::protobuf::GeneratedCodeInfo)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FileDescriptorSet_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FileDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_DescriptorProto_ExtensionRange_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_DescriptorProto_ReservedRange_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_DescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FieldDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_OneofDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_EnumDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_EnumValueDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_ServiceDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_MethodDescriptorProto_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FileOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_MessageOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FieldOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_OneofOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_EnumOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_EnumValueOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_ServiceOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_MethodOptions_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_UninterpretedOption_NamePart_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_UninterpretedOption_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_SourceCodeInfo_Location_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_SourceCodeInfo_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_GeneratedCodeInfo_Annotation_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_GeneratedCodeInfo_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FileDescriptorSet_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FileDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_DescriptorProto_ExtensionRange_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_DescriptorProto_ReservedRange_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_DescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_ExtensionRangeOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FieldDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_OneofDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumDescriptorProto_EnumReservedRange_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumValueDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_ServiceDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_MethodDescriptorProto_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FileOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_MessageOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FieldOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_OneofOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumValueOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_ServiceOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_MethodOptions_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_UninterpretedOption_NamePart_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_UninterpretedOption_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_SourceCodeInfo_Location_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_SourceCodeInfo_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_GeneratedCodeInfo_Annotation_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_GeneratedCodeInfo_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/descriptor.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/descriptor.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, file_level_enum_descriptors, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
-  ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 25);
-}
-
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _FileDescriptorSet_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-  _FileDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _DescriptorProto_ExtensionRange_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-  _DescriptorProto_ReservedRange_default_instance_.Shutdown();
-  delete file_level_metadata[3].reflection;
-  _DescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[4].reflection;
-  _FieldDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[5].reflection;
-  _OneofDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[6].reflection;
-  _EnumDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[7].reflection;
-  _EnumValueDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[8].reflection;
-  _ServiceDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[9].reflection;
-  _MethodDescriptorProto_default_instance_.Shutdown();
-  delete file_level_metadata[10].reflection;
-  _FileOptions_default_instance_.Shutdown();
-  delete file_level_metadata[11].reflection;
-  _MessageOptions_default_instance_.Shutdown();
-  delete file_level_metadata[12].reflection;
-  _FieldOptions_default_instance_.Shutdown();
-  delete file_level_metadata[13].reflection;
-  _OneofOptions_default_instance_.Shutdown();
-  delete file_level_metadata[14].reflection;
-  _EnumOptions_default_instance_.Shutdown();
-  delete file_level_metadata[15].reflection;
-  _EnumValueOptions_default_instance_.Shutdown();
-  delete file_level_metadata[16].reflection;
-  _ServiceOptions_default_instance_.Shutdown();
-  delete file_level_metadata[17].reflection;
-  _MethodOptions_default_instance_.Shutdown();
-  delete file_level_metadata[18].reflection;
-  _UninterpretedOption_NamePart_default_instance_.Shutdown();
-  delete file_level_metadata[19].reflection;
-  _UninterpretedOption_default_instance_.Shutdown();
-  delete file_level_metadata[20].reflection;
-  _SourceCodeInfo_Location_default_instance_.Shutdown();
-  delete file_level_metadata[21].reflection;
-  _SourceCodeInfo_default_instance_.Shutdown();
-  delete file_level_metadata[22].reflection;
-  _GeneratedCodeInfo_Annotation_default_instance_.Shutdown();
-  delete file_level_metadata[23].reflection;
-  _GeneratedCodeInfo_default_instance_.Shutdown();
-  delete file_level_metadata[24].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _FileDescriptorSet_default_instance_.DefaultConstruct();
-  _FileDescriptorProto_default_instance_.DefaultConstruct();
-  _DescriptorProto_ExtensionRange_default_instance_.DefaultConstruct();
-  _DescriptorProto_ReservedRange_default_instance_.DefaultConstruct();
-  _DescriptorProto_default_instance_.DefaultConstruct();
-  _FieldDescriptorProto_default_instance_.DefaultConstruct();
-  _OneofDescriptorProto_default_instance_.DefaultConstruct();
-  _EnumDescriptorProto_default_instance_.DefaultConstruct();
-  _EnumValueDescriptorProto_default_instance_.DefaultConstruct();
-  _ServiceDescriptorProto_default_instance_.DefaultConstruct();
-  _MethodDescriptorProto_default_instance_.DefaultConstruct();
-  _FileOptions_default_instance_.DefaultConstruct();
-  _MessageOptions_default_instance_.DefaultConstruct();
-  _FieldOptions_default_instance_.DefaultConstruct();
-  _OneofOptions_default_instance_.DefaultConstruct();
-  _EnumOptions_default_instance_.DefaultConstruct();
-  _EnumValueOptions_default_instance_.DefaultConstruct();
-  _ServiceOptions_default_instance_.DefaultConstruct();
-  _MethodOptions_default_instance_.DefaultConstruct();
-  _UninterpretedOption_NamePart_default_instance_.DefaultConstruct();
-  _UninterpretedOption_default_instance_.DefaultConstruct();
-  _SourceCodeInfo_Location_default_instance_.DefaultConstruct();
-  _SourceCodeInfo_default_instance_.DefaultConstruct();
-  _GeneratedCodeInfo_Annotation_default_instance_.DefaultConstruct();
-  _GeneratedCodeInfo_default_instance_.DefaultConstruct();
-  _FileDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::FileOptions*>(
-      ::google::protobuf::FileOptions::internal_default_instance());
-  _FileDescriptorProto_default_instance_.get_mutable()->source_code_info_ = const_cast< ::google::protobuf::SourceCodeInfo*>(
-      ::google::protobuf::SourceCodeInfo::internal_default_instance());
-  _DescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::MessageOptions*>(
-      ::google::protobuf::MessageOptions::internal_default_instance());
-  _FieldDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::FieldOptions*>(
-      ::google::protobuf::FieldOptions::internal_default_instance());
-  _OneofDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::OneofOptions*>(
-      ::google::protobuf::OneofOptions::internal_default_instance());
-  _EnumDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::EnumOptions*>(
-      ::google::protobuf::EnumOptions::internal_default_instance());
-  _EnumValueDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::EnumValueOptions*>(
-      ::google::protobuf::EnumValueOptions::internal_default_instance());
-  _ServiceDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::ServiceOptions*>(
-      ::google::protobuf::ServiceOptions::internal_default_instance());
-  _MethodDescriptorProto_default_instance_.get_mutable()->options_ = const_cast< ::google::protobuf::MethodOptions*>(
-      ::google::protobuf::MethodOptions::internal_default_instance());
+  ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 27);
 }
 
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n google/protobuf/descriptor.proto\022\017goog"
       "le.protobuf\"G\n\021FileDescriptorSet\0222\n\004file"
       "\030\001 \003(\0132$.google.protobuf.FileDescriptorP"
@@ -612,7 +1113,7 @@ void AddDescriptorsImpl() {
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       "Options\0229\n\020source_code_info\030\t \001(\0132\037.goog"
       "le.protobuf.SourceCodeInfo\022\016\n\006syntax\030\014 \001"
-      "(\t\"\360\004\n\017DescriptorProto\022\014\n\004name\030\001 \001(\t\0224\n\005"
+      "(\t\"\251\005\n\017DescriptorProto\022\014\n\004name\030\001 \001(\t\0224\n\005"
       "field\030\002 \003(\0132%.google.protobuf.FieldDescr"
       "iptorProto\0228\n\textension\030\006 \003(\0132%.google.p"
       "rotobuf.FieldDescriptorProto\0225\n\013nested_t"
@@ -625,138 +1126,149 @@ void AddDescriptorsImpl() {
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-      "idempotency_level\030\" \001(\0162/.google.protobu"
-      "f.MethodOptions.IdempotencyLevel:\023IDEMPO"
-      "TENCY_UNKNOWN\022C\n\024uninterpreted_option\030\347\007"
-      " \003(\0132$.google.protobuf.UninterpretedOpti"
-      "on\"P\n\020IdempotencyLevel\022\027\n\023IDEMPOTENCY_UN"
-      "KNOWN\020\000\022\023\n\017NO_SIDE_EFFECTS\020\001\022\016\n\nIDEMPOTE"
-      "NT\020\002*\t\010\350\007\020\200\200\200\200\002\"\236\002\n\023UninterpretedOption\022"
-      ";\n\004name\030\002 \003(\0132-.google.protobuf.Uninterp"
-      "retedOption.NamePart\022\030\n\020identifier_value"
-      "\030\003 \001(\t\022\032\n\022positive_int_value\030\004 \001(\004\022\032\n\022ne"
-      "gative_int_value\030\005 \001(\003\022\024\n\014double_value\030\006"
-      " \001(\001\022\024\n\014string_value\030\007 \001(\014\022\027\n\017aggregate_"
-      "value\030\010 \001(\t\0323\n\010NamePart\022\021\n\tname_part\030\001 \002"
-      "(\t\022\024\n\014is_extension\030\002 \002(\010\"\325\001\n\016SourceCodeI"
-      "nfo\022:\n\010location\030\001 \003(\0132(.google.protobuf."
-      "SourceCodeInfo.Location\032\206\001\n\010Location\022\020\n\004"
-      "path\030\001 \003(\005B\002\020\001\022\020\n\004span\030\002 \003(\005B\002\020\001\022\030\n\020lead"
-      "ing_comments\030\003 \001(\t\022\031\n\021trailing_comments\030"
-      "\004 \001(\t\022!\n\031leading_detached_comments\030\006 \003(\t"
-      "\"\247\001\n\021GeneratedCodeInfo\022A\n\nannotation\030\001 \003"
-      "(\0132-.google.protobuf.GeneratedCodeInfo.A"
-      "nnotation\032O\n\nAnnotation\022\020\n\004path\030\001 \003(\005B\002\020"
-      "\001\022\023\n\013source_file\030\002 \001(\t\022\r\n\005begin\030\003 \001(\005\022\013\n"
-      "\003end\030\004 \001(\005B\214\001\n\023com.google.protobufB\020Desc"
-      "riptorProtosH\001Z>github.com/golang/protob"
-      "uf/protoc-gen-go/descriptor;descriptor\242\002"
-      "\003GPB\252\002\032Google.Protobuf.Reflection"
+      ".UninterpretedOption*\t\010\350\007\020\200\200\200\200\002\"\274\005\n\024Fiel"
+      "dDescriptorProto\022\014\n\004name\030\001 \001(\t\022\016\n\006number"
+      "\030\003 \001(\005\022:\n\005label\030\004 \001(\0162+.google.protobuf."
+      "FieldDescriptorProto.Label\0228\n\004type\030\005 \001(\016"
+      "2*.google.protobuf.FieldDescriptorProto."
+      "Type\022\021\n\ttype_name\030\006 \001(\t\022\020\n\010extendee\030\002 \001("
+      "\t\022\025\n\rdefault_value\030\007 \001(\t\022\023\n\013oneof_index\030"
+      "\t \001(\005\022\021\n\tjson_name\030\n \001(\t\022.\n\007options\030\010 \001("
+      "\0132\035.google.protobuf.FieldOptions\"\266\002\n\004Typ"
+      "e\022\017\n\013TYPE_DOUBLE\020\001\022\016\n\nTYPE_FLOAT\020\002\022\016\n\nTY"
+      "PE_INT64\020\003\022\017\n\013TYPE_UINT64\020\004\022\016\n\nTYPE_INT3"
+      "2\020\005\022\020\n\014TYPE_FIXED64\020\006\022\020\n\014TYPE_FIXED32\020\007\022"
+      "\r\n\tTYPE_BOOL\020\010\022\017\n\013TYPE_STRING\020\t\022\016\n\nTYPE_"
+      "GROUP\020\n\022\020\n\014TYPE_MESSAGE\020\013\022\016\n\nTYPE_BYTES\020"
+      "\014\022\017\n\013TYPE_UINT32\020\r\022\r\n\tTYPE_ENUM\020\016\022\021\n\rTYP"
+      "E_SFIXED32\020\017\022\021\n\rTYPE_SFIXED64\020\020\022\017\n\013TYPE_"
+      "SINT32\020\021\022\017\n\013TYPE_SINT64\020\022\"C\n\005Label\022\022\n\016LA"
+      "BEL_OPTIONAL\020\001\022\022\n\016LABEL_REQUIRED\020\002\022\022\n\016LA"
+      "BEL_REPEATED\020\003\"T\n\024OneofDescriptorProto\022\014"
+      "\n\004name\030\001 \001(\t\022.\n\007options\030\002 \001(\0132\035.google.p"
+      "rotobuf.OneofOptions\"\244\002\n\023EnumDescriptorP"
+      "roto\022\014\n\004name\030\001 \001(\t\0228\n\005value\030\002 \003(\0132).goog"
+      "le.protobuf.EnumValueDescriptorProto\022-\n\007"
+      "options\030\003 \001(\0132\034.google.protobuf.EnumOpti"
+      "ons\022N\n\016reserved_range\030\004 \003(\01326.google.pro"
+      "tobuf.EnumDescriptorProto.EnumReservedRa"
+      "nge\022\025\n\rreserved_name\030\005 \003(\t\032/\n\021EnumReserv"
+      "edRange\022\r\n\005start\030\001 \001(\005\022\013\n\003end\030\002 \001(\005\"l\n\030E"
+      "numValueDescriptorProto\022\014\n\004name\030\001 \001(\t\022\016\n"
+      "\006number\030\002 \001(\005\0222\n\007options\030\003 \001(\0132!.google."
+      "protobuf.EnumValueOptions\"\220\001\n\026ServiceDes"
+      "criptorProto\022\014\n\004name\030\001 \001(\t\0226\n\006method\030\002 \003"
+      "(\0132&.google.protobuf.MethodDescriptorPro"
+      "to\0220\n\007options\030\003 \001(\0132\037.google.protobuf.Se"
+      "rviceOptions\"\301\001\n\025MethodDescriptorProto\022\014"
+      "\n\004name\030\001 \001(\t\022\022\n\ninput_type\030\002 \001(\t\022\023\n\013outp"
+      "ut_type\030\003 \001(\t\022/\n\007options\030\004 \001(\0132\036.google."
+      "protobuf.MethodOptions\022\037\n\020client_streami"
+      "ng\030\005 \001(\010:\005false\022\037\n\020server_streaming\030\006 \001("
+      "\010:\005false\"\246\006\n\013FileOptions\022\024\n\014java_package"
+      "\030\001 \001(\t\022\034\n\024java_outer_classname\030\010 \001(\t\022\"\n\023"
+      "java_multiple_files\030\n \001(\010:\005false\022)\n\035java"
+      "_generate_equals_and_hash\030\024 \001(\010B\002\030\001\022%\n\026j"
+      "ava_string_check_utf8\030\033 \001(\010:\005false\022F\n\014op"
+      "timize_for\030\t \001(\0162).google.protobuf.FileO"
+      "ptions.OptimizeMode:\005SPEED\022\022\n\ngo_package"
+      "\030\013 \001(\t\022\"\n\023cc_generic_services\030\020 \001(\010:\005fal"
+      "se\022$\n\025java_generic_services\030\021 \001(\010:\005false"
+      "\022\"\n\023py_generic_services\030\022 \001(\010:\005false\022#\n\024"
+      "php_generic_services\030* \001(\010:\005false\022\031\n\ndep"
+      "recated\030\027 \001(\010:\005false\022\037\n\020cc_enable_arenas"
+      "\030\037 \001(\010:\005false\022\031\n\021objc_class_prefix\030$ \001(\t"
+      "\022\030\n\020csharp_namespace\030% \001(\t\022\024\n\014swift_pref"
+      "ix\030\' \001(\t\022\030\n\020php_class_prefix\030( \001(\t\022\025\n\rph"
+      "p_namespace\030) \001(\t\022\036\n\026php_metadata_namesp"
+      "ace\030, \001(\t\022\024\n\014ruby_package\030- \001(\t\022C\n\024unint"
+      "erpreted_option\030\347\007 \003(\0132$.google.protobuf"
+      ".UninterpretedOption\":\n\014OptimizeMode\022\t\n\005"
+      "SPEED\020\001\022\r\n\tCODE_SIZE\020\002\022\020\n\014LITE_RUNTIME\020\003"
+      "*\t\010\350\007\020\200\200\200\200\002J\004\010&\020\'\"\362\001\n\016MessageOptions\022&\n\027"
+      "message_set_wire_format\030\001 \001(\010:\005false\022.\n\037"
+      "no_standard_descriptor_accessor\030\002 \001(\010:\005f"
+      "alse\022\031\n\ndeprecated\030\003 \001(\010:\005false\022\021\n\tmap_e"
+      "ntry\030\007 \001(\010\022C\n\024uninterpreted_option\030\347\007 \003("
+      "\0132$.google.protobuf.UninterpretedOption*"
+      "\t\010\350\007\020\200\200\200\200\002J\004\010\010\020\tJ\004\010\t\020\n\"\236\003\n\014FieldOptions\022"
+      ":\n\005ctype\030\001 \001(\0162#.google.protobuf.FieldOp"
+      "tions.CType:\006STRING\022\016\n\006packed\030\002 \001(\010\022\?\n\006j"
+      "stype\030\006 \001(\0162$.google.protobuf.FieldOptio"
+      "ns.JSType:\tJS_NORMAL\022\023\n\004lazy\030\005 \001(\010:\005fals"
+      "e\022\031\n\ndeprecated\030\003 \001(\010:\005false\022\023\n\004weak\030\n \001"
+      "(\010:\005false\022C\n\024uninterpreted_option\030\347\007 \003(\013"
+      "2$.google.protobuf.UninterpretedOption\"/"
+      "\n\005CType\022\n\n\006STRING\020\000\022\010\n\004CORD\020\001\022\020\n\014STRING_"
+      "PIECE\020\002\"5\n\006JSType\022\r\n\tJS_NORMAL\020\000\022\r\n\tJS_S"
+      "TRING\020\001\022\r\n\tJS_NUMBER\020\002*\t\010\350\007\020\200\200\200\200\002J\004\010\004\020\005\""
+      "^\n\014OneofOptions\022C\n\024uninterpreted_option\030"
+      "\347\007 \003(\0132$.google.protobuf.UninterpretedOp"
+      "tion*\t\010\350\007\020\200\200\200\200\002\"\223\001\n\013EnumOptions\022\023\n\013allow"
+      "_alias\030\002 \001(\010\022\031\n\ndeprecated\030\003 \001(\010:\005false\022"
+      "C\n\024uninterpreted_option\030\347\007 \003(\0132$.google."
+      "protobuf.UninterpretedOption*\t\010\350\007\020\200\200\200\200\002J"
+      "\004\010\005\020\006\"}\n\020EnumValueOptions\022\031\n\ndeprecated\030"
+      "\001 \001(\010:\005false\022C\n\024uninterpreted_option\030\347\007 "
+      "\003(\0132$.google.protobuf.UninterpretedOptio"
+      "n*\t\010\350\007\020\200\200\200\200\002\"{\n\016ServiceOptions\022\031\n\ndeprec"
+      "ated\030! \001(\010:\005false\022C\n\024uninterpreted_optio"
+      "n\030\347\007 \003(\0132$.google.protobuf.Uninterpreted"
+      "Option*\t\010\350\007\020\200\200\200\200\002\"\255\002\n\rMethodOptions\022\031\n\nd"
+      "eprecated\030! \001(\010:\005false\022_\n\021idempotency_le"
+      "vel\030\" \001(\0162/.google.protobuf.MethodOption"
+      "s.IdempotencyLevel:\023IDEMPOTENCY_UNKNOWN\022"
+      "C\n\024uninterpreted_option\030\347\007 \003(\0132$.google."
+      "protobuf.UninterpretedOption\"P\n\020Idempote"
+      "ncyLevel\022\027\n\023IDEMPOTENCY_UNKNOWN\020\000\022\023\n\017NO_"
+      "SIDE_EFFECTS\020\001\022\016\n\nIDEMPOTENT\020\002*\t\010\350\007\020\200\200\200\200"
+      "\002\"\236\002\n\023UninterpretedOption\022;\n\004name\030\002 \003(\0132"
+      "-.google.protobuf.UninterpretedOption.Na"
+      "mePart\022\030\n\020identifier_value\030\003 \001(\t\022\032\n\022posi"
+      "tive_int_value\030\004 \001(\004\022\032\n\022negative_int_val"
+      "ue\030\005 \001(\003\022\024\n\014double_value\030\006 \001(\001\022\024\n\014string"
+      "_value\030\007 \001(\014\022\027\n\017aggregate_value\030\010 \001(\t\0323\n"
+      "\010NamePart\022\021\n\tname_part\030\001 \002(\t\022\024\n\014is_exten"
+      "sion\030\002 \002(\010\"\325\001\n\016SourceCodeInfo\022:\n\010locatio"
+      "n\030\001 \003(\0132(.google.protobuf.SourceCodeInfo"
+      ".Location\032\206\001\n\010Location\022\020\n\004path\030\001 \003(\005B\002\020\001"
+      "\022\020\n\004span\030\002 \003(\005B\002\020\001\022\030\n\020leading_comments\030\003"
+      " \001(\t\022\031\n\021trailing_comments\030\004 \001(\t\022!\n\031leadi"
+      "ng_detached_comments\030\006 \003(\t\"\247\001\n\021Generated"
+      "CodeInfo\022A\n\nannotation\030\001 \003(\0132-.google.pr"
+      "otobuf.GeneratedCodeInfo.Annotation\032O\n\nA"
+      "nnotation\022\020\n\004path\030\001 \003(\005B\002\020\001\022\023\n\013source_fi"
+      "le\030\002 \001(\t\022\r\n\005begin\030\003 \001(\005\022\013\n\003end\030\004 \001(\005B\217\001\n"
+      "\023com.google.protobufB\020DescriptorProtosH\001"
+      "Z>github.com/golang/protobuf/protoc-gen-"
+      "go/descriptor;descriptor\370\001\001\242\002\003GPB\252\002\032Goog"
+      "le.Protobuf.Reflection"
   };
   ::google::protobuf::DescriptorPool::InternalAddGeneratedFile(
-      descriptor, 5553);
+      descriptor, 6022);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/descriptor.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto
-
+namespace google {
+namespace protobuf {
 const ::google::protobuf::EnumDescriptor* FieldDescriptorProto_Type_descriptor() {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
   return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_enum_descriptors[0];
@@ -928,30 +1440,38 @@ const int MethodOptions::IdempotencyLevel_ARRAYSIZE;
 
 // ===================================================================
 
+void FileDescriptorSet::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FileDescriptorSet::kFileFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 FileDescriptorSet::FileDescriptorSet()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorSet.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FileDescriptorSet)
 }
+FileDescriptorSet::FileDescriptorSet(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  file_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorSet.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.FileDescriptorSet)
+}
 FileDescriptorSet::FileDescriptorSet(const FileDescriptorSet& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       file_(from.file_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FileDescriptorSet)
 }
 
 void FileDescriptorSet::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 FileDescriptorSet::~FileDescriptorSet() {
@@ -960,33 +1480,35 @@ FileDescriptorSet::~FileDescriptorSet() {
 }
 
 void FileDescriptorSet::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void FileDescriptorSet::ArenaDtor(void* object) {
+  FileDescriptorSet* _this = reinterpret_cast< FileDescriptorSet* >(object);
+  (void)_this;
+}
+void FileDescriptorSet::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void FileDescriptorSet::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FileDescriptorSet::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FileDescriptorSet& FileDescriptorSet::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorSet.base);
   return *internal_default_instance();
 }
 
-FileDescriptorSet* FileDescriptorSet::New(::google::protobuf::Arena* arena) const {
-  FileDescriptorSet* n = new FileDescriptorSet;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FileDescriptorSet::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FileDescriptorSet)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   file_.Clear();
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -998,33 +1520,29 @@ bool FileDescriptorSet::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FileDescriptorSet)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.FileDescriptorProto file = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_file()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1041,33 +1559,43 @@ failure:
 void FileDescriptorSet::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FileDescriptorSet)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.FileDescriptorProto file = 1;
-  for (unsigned int i = 0, n = this->file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->file_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      1, this->file(i), output);
+      1,
+      this->file(static_cast<int>(i)),
+      output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FileDescriptorSet)
 }
 
 ::google::protobuf::uint8* FileDescriptorSet::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FileDescriptorSet)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.FileDescriptorProto file = 1;
-  for (unsigned int i = 0, n = this->file_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->file_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        1, this->file(i), false, target);
+      InternalWriteMessageToArray(
+        1, this->file(static_cast<int>(i)), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FileDescriptorSet)
   return target;
@@ -1080,23 +1608,21 @@ size_t FileDescriptorSet::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.FileDescriptorProto file = 1;
   {
-    unsigned int count = this->file_size();
+    unsigned int count = static_cast<unsigned int>(this->file_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->file(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->file(static_cast<int>(i)));
     }
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1119,6 +1645,9 @@ void FileDescriptorSet::MergeFrom(const FileDescriptorSet& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.FileDescriptorSet)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   file_.MergeFrom(from.file_);
 }
 
@@ -1143,57 +1672,70 @@ bool FileDescriptorSet::IsInitialized() const {
 
 void FileDescriptorSet::Swap(FileDescriptorSet* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    FileDescriptorSet* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void FileDescriptorSet::UnsafeArenaSwap(FileDescriptorSet* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void FileDescriptorSet::InternalSwap(FileDescriptorSet* other) {
-  file_.UnsafeArenaSwap(&other->file_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&file_)->InternalSwap(CastToBase(&other->file_));
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata FileDescriptorSet::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FileDescriptorSet
 
-// repeated .google.protobuf.FileDescriptorProto file = 1;
-int FileDescriptorSet::file_size() const {
-  return file_.size();
-}
-void FileDescriptorSet::clear_file() {
-  file_.Clear();
-}
-const ::google::protobuf::FileDescriptorProto& FileDescriptorSet::file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorSet.file)
-  return file_.Get(index);
-}
-::google::protobuf::FileDescriptorProto* FileDescriptorSet::mutable_file(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorSet.file)
-  return file_.Mutable(index);
-}
-::google::protobuf::FileDescriptorProto* FileDescriptorSet::add_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorSet.file)
-  return file_.Add();
+// ===================================================================
+
+void FileDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_FileDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::FileOptions*>(
+      ::google::protobuf::FileOptions::internal_default_instance());
+  ::google::protobuf::_FileDescriptorProto_default_instance_._instance.get_mutable()->source_code_info_ = const_cast< ::google::protobuf::SourceCodeInfo*>(
+      ::google::protobuf::SourceCodeInfo::internal_default_instance());
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
-FileDescriptorSet::mutable_file() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorSet.file)
-  return &file_;
+void FileDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::FileOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
+  }
+  options_ = options;
+  if (options) {
+    set_has_options();
+  } else {
+    clear_has_options();
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileDescriptorProto.options)
 }
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
-FileDescriptorSet::file() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorSet.file)
-  return file_;
+void FileDescriptorProto::unsafe_arena_set_allocated_source_code_info(
+    ::google::protobuf::SourceCodeInfo* source_code_info) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete source_code_info_;
+  }
+  source_code_info_ = source_code_info;
+  if (source_code_info) {
+    set_has_source_code_info();
+  } else {
+    clear_has_source_code_info();
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileDescriptorProto.source_code_info)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FileDescriptorProto::kNameFieldNumber;
 const int FileDescriptorProto::kPackageFieldNumber;
@@ -1211,36 +1753,52 @@ const int FileDescriptorProto::kSyntaxFieldNumber;
 
 FileDescriptorProto::FileDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FileDescriptorProto)
 }
+FileDescriptorProto::FileDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  dependency_(arena),
+  message_type_(arena),
+  enum_type_(arena),
+  service_(arena),
+  extension_(arena),
+  public_dependency_(arena),
+  weak_dependency_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.FileDescriptorProto)
+}
 FileDescriptorProto::FileDescriptorProto(const FileDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       dependency_(from.dependency_),
-      public_dependency_(from.public_dependency_),
-      weak_dependency_(from.weak_dependency_),
       message_type_(from.message_type_),
       enum_type_(from.enum_type_),
       service_(from.service_),
-      extension_(from.extension_) {
+      extension_(from.extension_),
+      public_dependency_(from.public_dependency_),
+      weak_dependency_(from.weak_dependency_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_package()) {
-    package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.package_);
+    package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.package(),
+      GetArenaNoVirtual());
   }
   syntax_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_syntax()) {
-    syntax_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.syntax_);
+    syntax_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.syntax(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::FileOptions(*from.options_);
@@ -1256,12 +1814,12 @@ FileDescriptorProto::FileDescriptorProto(const FileDescriptorProto& from)
 }
 
 void FileDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   syntax_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&options_, 0, reinterpret_cast<char*>(&source_code_info_) -
-    reinterpret_cast<char*>(&options_) + sizeof(source_code_info_));
+  ::memset(&options_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&source_code_info_) -
+      reinterpret_cast<char*>(&options_)) + sizeof(source_code_info_));
 }
 
 FileDescriptorProto::~FileDescriptorProto() {
@@ -1270,69 +1828,65 @@ FileDescriptorProto::~FileDescriptorProto() {
 }
 
 void FileDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   package_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   syntax_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
-  if (this != internal_default_instance()) {
-    delete source_code_info_;
-  }
+  if (this != internal_default_instance()) delete options_;
+  if (this != internal_default_instance()) delete source_code_info_;
 }
 
+void FileDescriptorProto::ArenaDtor(void* object) {
+  FileDescriptorProto* _this = reinterpret_cast< FileDescriptorProto* >(object);
+  (void)_this;
+}
+void FileDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void FileDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FileDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FileDescriptorProto& FileDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileDescriptorProto.base);
   return *internal_default_instance();
 }
 
-FileDescriptorProto* FileDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  FileDescriptorProto* n = new FileDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FileDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FileDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   dependency_.Clear();
-  public_dependency_.Clear();
-  weak_dependency_.Clear();
   message_type_.Clear();
   enum_type_.Clear();
   service_.Clear();
   extension_.Clear();
-  if (_has_bits_[0 / 32] & 31u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  public_dependency_.Clear();
+  weak_dependency_.Clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 31u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_package()) {
-      GOOGLE_DCHECK(!package_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*package_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      package_.ClearNonDefaultToEmpty();
     }
-    if (has_syntax()) {
-      GOOGLE_DCHECK(!syntax_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*syntax_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      syntax_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000008u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::FileOptions::Clear();
+      options_->Clear();
     }
-    if (has_source_code_info()) {
+    if (cached_has_bits & 0x00000010u) {
       GOOGLE_DCHECK(source_code_info_ != NULL);
-      source_code_info_->::google::protobuf::SourceCodeInfo::Clear();
+      source_code_info_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -1345,18 +1899,18 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FileDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileDescriptorProto.name");
         } else {
@@ -1368,11 +1922,11 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // optional string package = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_package()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->package().data(), this->package().length(),
+            this->package().data(), static_cast<int>(this->package().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileDescriptorProto.package");
         } else {
@@ -1384,12 +1938,12 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // repeated string dependency = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_dependency()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
             this->dependency(this->dependency_size() - 1).data(),
-            this->dependency(this->dependency_size() - 1).length(),
+            static_cast<int>(this->dependency(this->dependency_size() - 1).length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileDescriptorProto.dependency");
         } else {
@@ -1401,64 +1955,56 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // repeated .google.protobuf.DescriptorProto message_type = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_message_type()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.EnumDescriptorProto enum_type = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(42u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_enum_type()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.ServiceDescriptorProto service = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_service()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.FieldDescriptorProto extension = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(58u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 58 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_extension()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // optional .google.protobuf.FileOptions options = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(66u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(66u /* 66 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -1469,8 +2015,8 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.SourceCodeInfo source_code_info = 9;
       case 9: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(74u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(74u /* 74 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_source_code_info()));
         } else {
           goto handle_unusual;
@@ -1481,12 +2027,13 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // repeated int32 public_dependency = 10;
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(80u)) {
+            static_cast< ::google::protobuf::uint8>(80u /* 80 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadRepeatedPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  1, 80u, input, this->mutable_public_dependency())));
-        } else if (static_cast< ::google::protobuf::uint8>(tag) ==
-                   static_cast< ::google::protobuf::uint8>(82u)) {
+        } else if (
+            static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(82u /* 82 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadPackedPrimitiveNoInline<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  input, this->mutable_public_dependency())));
@@ -1499,12 +2046,13 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // repeated int32 weak_dependency = 11;
       case 11: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(88u)) {
+            static_cast< ::google::protobuf::uint8>(88u /* 88 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadRepeatedPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  1, 88u, input, this->mutable_weak_dependency())));
-        } else if (static_cast< ::google::protobuf::uint8>(tag) ==
-                   static_cast< ::google::protobuf::uint8>(90u)) {
+        } else if (
+            static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(90u /* 90 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadPackedPrimitiveNoInline<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  input, this->mutable_weak_dependency())));
@@ -1517,11 +2065,11 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
       // optional string syntax = 12;
       case 12: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(98u)) {
+            static_cast< ::google::protobuf::uint8>(98u /* 98 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_syntax()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->syntax().data(), this->syntax().length(),
+            this->syntax().data(), static_cast<int>(this->syntax().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileDescriptorProto.syntax");
         } else {
@@ -1532,13 +2080,11 @@ bool FileDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1555,10 +2101,14 @@ failure:
 void FileDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FileDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1566,9 +2116,9 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string package = 2;
-  if (has_package()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->package().data(), this->package().length(),
+      this->package().data(), static_cast<int>(this->package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.package");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1578,7 +2128,7 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   // repeated string dependency = 3;
   for (int i = 0, n = this->dependency_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->dependency(i).data(), this->dependency(i).length(),
+      this->dependency(i).data(), static_cast<int>(this->dependency(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.dependency");
     ::google::protobuf::internal::WireFormatLite::WriteString(
@@ -1586,39 +2136,51 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.DescriptorProto message_type = 4;
-  for (unsigned int i = 0, n = this->message_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->message_type_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      4, this->message_type(i), output);
+      4,
+      this->message_type(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.EnumDescriptorProto enum_type = 5;
-  for (unsigned int i = 0, n = this->enum_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enum_type_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      5, this->enum_type(i), output);
+      5,
+      this->enum_type(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.ServiceDescriptorProto service = 6;
-  for (unsigned int i = 0, n = this->service_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->service_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      6, this->service(i), output);
+      6,
+      this->service(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.FieldDescriptorProto extension = 7;
-  for (unsigned int i = 0, n = this->extension_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      7, this->extension(i), output);
+      7,
+      this->extension(static_cast<int>(i)),
+      output);
   }
 
   // optional .google.protobuf.FileOptions options = 8;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      8, *this->options_, output);
+      8, this->_internal_options(), output);
   }
 
   // optional .google.protobuf.SourceCodeInfo source_code_info = 9;
-  if (has_source_code_info()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      9, *this->source_code_info_, output);
+      9, this->_internal_source_code_info(), output);
   }
 
   // repeated int32 public_dependency = 10;
@@ -1634,9 +2196,9 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string syntax = 12;
-  if (has_syntax()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->syntax().data(), this->syntax().length(),
+      this->syntax().data(), static_cast<int>(this->syntax().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.syntax");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1645,19 +2207,23 @@ void FileDescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FileDescriptorProto)
 }
 
 ::google::protobuf::uint8* FileDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FileDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.name");
     target =
@@ -1666,9 +2232,9 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string package = 2;
-  if (has_package()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->package().data(), this->package().length(),
+      this->package().data(), static_cast<int>(this->package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.package");
     target =
@@ -1679,7 +2245,7 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   // repeated string dependency = 3;
   for (int i = 0, n = this->dependency_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->dependency(i).data(), this->dependency(i).length(),
+      this->dependency(i).data(), static_cast<int>(this->dependency(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.dependency");
     target = ::google::protobuf::internal::WireFormatLite::
@@ -1687,63 +2253,63 @@ void FileDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.DescriptorProto message_type = 4;
-  for (unsigned int i = 0, n = this->message_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->message_type_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        4, this->message_type(i), false, target);
+      InternalWriteMessageToArray(
+        4, this->message_type(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.EnumDescriptorProto enum_type = 5;
-  for (unsigned int i = 0, n = this->enum_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enum_type_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        5, this->enum_type(i), false, target);
+      InternalWriteMessageToArray(
+        5, this->enum_type(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.ServiceDescriptorProto service = 6;
-  for (unsigned int i = 0, n = this->service_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->service_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        6, this->service(i), false, target);
+      InternalWriteMessageToArray(
+        6, this->service(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.FieldDescriptorProto extension = 7;
-  for (unsigned int i = 0, n = this->extension_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        7, this->extension(i), false, target);
+      InternalWriteMessageToArray(
+        7, this->extension(static_cast<int>(i)), deterministic, target);
   }
 
   // optional .google.protobuf.FileOptions options = 8;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        8, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        8, this->_internal_options(), deterministic, target);
   }
 
   // optional .google.protobuf.SourceCodeInfo source_code_info = 9;
-  if (has_source_code_info()) {
+  if (cached_has_bits & 0x00000010u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        9, *this->source_code_info_, false, target);
+      InternalWriteMessageToArray(
+        9, this->_internal_source_code_info(), deterministic, target);
   }
 
   // repeated int32 public_dependency = 10;
-  for (int i = 0, n = this->public_dependency_size(); i < n; i++) {
-    target = ::google::protobuf::internal::WireFormatLite::
-      WriteInt32ToArray(10, this->public_dependency(i), target);
-  }
+  target = ::google::protobuf::internal::WireFormatLite::
+    WriteInt32ToArray(10, this->public_dependency_, target);
 
   // repeated int32 weak_dependency = 11;
-  for (int i = 0, n = this->weak_dependency_size(); i < n; i++) {
-    target = ::google::protobuf::internal::WireFormatLite::
-      WriteInt32ToArray(11, this->weak_dependency(i), target);
-  }
+  target = ::google::protobuf::internal::WireFormatLite::
+    WriteInt32ToArray(11, this->weak_dependency_, target);
 
   // optional string syntax = 12;
-  if (has_syntax()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->syntax().data(), this->syntax().length(),
+      this->syntax().data(), static_cast<int>(this->syntax().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileDescriptorProto.syntax");
     target =
@@ -1753,7 +2319,7 @@ void FileDescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FileDescriptorProto)
   return target;
@@ -1766,7 +2332,7 @@ size_t FileDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated string dependency = 3;
   total_size += 1 *
@@ -1776,68 +2342,68 @@ size_t FileDescriptorProto::ByteSizeLong() const {
       this->dependency(i));
   }
 
-  // repeated int32 public_dependency = 10;
-  {
-    size_t data_size = ::google::protobuf::internal::WireFormatLite::
-      Int32Size(this->public_dependency_);
-    total_size += 1 *
-                  ::google::protobuf::internal::FromIntSize(this->public_dependency_size());
-    total_size += data_size;
-  }
-
-  // repeated int32 weak_dependency = 11;
-  {
-    size_t data_size = ::google::protobuf::internal::WireFormatLite::
-      Int32Size(this->weak_dependency_);
-    total_size += 1 *
-                  ::google::protobuf::internal::FromIntSize(this->weak_dependency_size());
-    total_size += data_size;
-  }
-
   // repeated .google.protobuf.DescriptorProto message_type = 4;
   {
-    unsigned int count = this->message_type_size();
+    unsigned int count = static_cast<unsigned int>(this->message_type_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->message_type(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->message_type(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.EnumDescriptorProto enum_type = 5;
   {
-    unsigned int count = this->enum_type_size();
+    unsigned int count = static_cast<unsigned int>(this->enum_type_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->enum_type(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->enum_type(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.ServiceDescriptorProto service = 6;
   {
-    unsigned int count = this->service_size();
+    unsigned int count = static_cast<unsigned int>(this->service_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->service(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->service(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.FieldDescriptorProto extension = 7;
   {
-    unsigned int count = this->extension_size();
+    unsigned int count = static_cast<unsigned int>(this->extension_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->extension(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->extension(static_cast<int>(i)));
     }
   }
 
+  // repeated int32 public_dependency = 10;
+  {
+    size_t data_size = ::google::protobuf::internal::WireFormatLite::
+      Int32Size(this->public_dependency_);
+    total_size += 1 *
+                  ::google::protobuf::internal::FromIntSize(this->public_dependency_size());
+    total_size += data_size;
+  }
+
+  // repeated int32 weak_dependency = 11;
+  {
+    size_t data_size = ::google::protobuf::internal::WireFormatLite::
+      Int32Size(this->weak_dependency_);
+    total_size += 1 *
+                  ::google::protobuf::internal::FromIntSize(this->weak_dependency_size());
+    total_size += data_size;
+  }
+
   if (_has_bits_[0 / 32] & 31u) {
     // optional string name = 1;
     if (has_name()) {
@@ -1863,22 +2429,20 @@ size_t FileDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.FileOptions options = 8;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
     // optional .google.protobuf.SourceCodeInfo source_code_info = 9;
     if (has_source_code_info()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->source_code_info_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *source_code_info_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1901,30 +2465,31 @@ void FileDescriptorProto::MergeFrom(const FileDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.FileDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   dependency_.MergeFrom(from.dependency_);
-  public_dependency_.MergeFrom(from.public_dependency_);
-  weak_dependency_.MergeFrom(from.weak_dependency_);
   message_type_.MergeFrom(from.message_type_);
   enum_type_.MergeFrom(from.enum_type_);
   service_.MergeFrom(from.service_);
   extension_.MergeFrom(from.extension_);
-  if (from._has_bits_[0 / 32] & 31u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  public_dependency_.MergeFrom(from.public_dependency_);
+  weak_dependency_.MergeFrom(from.weak_dependency_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 31u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_package()) {
-      set_has_package();
-      package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.package_);
+    if (cached_has_bits & 0x00000002u) {
+      set_package(from.package());
     }
-    if (from.has_syntax()) {
-      set_has_syntax();
-      syntax_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.syntax_);
+    if (cached_has_bits & 0x00000004u) {
+      set_syntax(from.syntax());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000008u) {
       mutable_options()->::google::protobuf::FileOptions::MergeFrom(from.options());
     }
-    if (from.has_source_code_info()) {
+    if (cached_has_bits & 0x00000010u) {
       mutable_source_code_info()->::google::protobuf::SourceCodeInfo::MergeFrom(from.source_code_info());
     }
   }
@@ -1957,590 +2522,110 @@ bool FileDescriptorProto::IsInitialized() const {
 
 void FileDescriptorProto::Swap(FileDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    FileDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void FileDescriptorProto::UnsafeArenaSwap(FileDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void FileDescriptorProto::InternalSwap(FileDescriptorProto* other) {
-  dependency_.UnsafeArenaSwap(&other->dependency_);
-  public_dependency_.UnsafeArenaSwap(&other->public_dependency_);
-  weak_dependency_.UnsafeArenaSwap(&other->weak_dependency_);
-  message_type_.UnsafeArenaSwap(&other->message_type_);
-  enum_type_.UnsafeArenaSwap(&other->enum_type_);
-  service_.UnsafeArenaSwap(&other->service_);
-  extension_.UnsafeArenaSwap(&other->extension_);
-  name_.Swap(&other->name_);
-  package_.Swap(&other->package_);
-  syntax_.Swap(&other->syntax_);
-  std::swap(options_, other->options_);
-  std::swap(source_code_info_, other->source_code_info_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  dependency_.InternalSwap(CastToBase(&other->dependency_));
+  CastToBase(&message_type_)->InternalSwap(CastToBase(&other->message_type_));
+  CastToBase(&enum_type_)->InternalSwap(CastToBase(&other->enum_type_));
+  CastToBase(&service_)->InternalSwap(CastToBase(&other->service_));
+  CastToBase(&extension_)->InternalSwap(CastToBase(&other->extension_));
+  public_dependency_.InternalSwap(&other->public_dependency_);
+  weak_dependency_.InternalSwap(&other->weak_dependency_);
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  package_.Swap(&other->package_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  syntax_.Swap(&other->syntax_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(source_code_info_, other->source_code_info_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata FileDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[1];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FileDescriptorProto
-
-// optional string name = 1;
-bool FileDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void FileDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void FileDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void FileDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& FileDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void FileDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.name)
-}
-#if LANG_CXX11
-void FileDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.name)
-}
-#endif
-void FileDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.name)
-}
-void FileDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.name)
-}
-::std::string* FileDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.name)
-}
-
-// optional string package = 2;
-bool FileDescriptorProto::has_package() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void FileDescriptorProto::set_has_package() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void FileDescriptorProto::clear_has_package() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void FileDescriptorProto::clear_package() {
-  package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_package();
-}
-const ::std::string& FileDescriptorProto::package() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.package)
-  return package_.GetNoArena();
-}
-void FileDescriptorProto::set_package(const ::std::string& value) {
-  set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.package)
-}
-#if LANG_CXX11
-void FileDescriptorProto::set_package(::std::string&& value) {
-  set_has_package();
-  package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.package)
-}
-#endif
-void FileDescriptorProto::set_package(const char* value) {
-  set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.package)
-}
-void FileDescriptorProto::set_package(const char* value, size_t size) {
-  set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.package)
-}
-::std::string* FileDescriptorProto::mutable_package() {
-  set_has_package();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.package)
-  return package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileDescriptorProto::release_package() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.package)
-  clear_has_package();
-  return package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileDescriptorProto::set_allocated_package(::std::string* package) {
-  if (package != NULL) {
-    set_has_package();
-  } else {
-    clear_has_package();
-  }
-  package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), package);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.package)
-}
-
-// repeated string dependency = 3;
-int FileDescriptorProto::dependency_size() const {
-  return dependency_.size();
-}
-void FileDescriptorProto::clear_dependency() {
-  dependency_.Clear();
-}
-const ::std::string& FileDescriptorProto::dependency(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.dependency)
-  return dependency_.Get(index);
-}
-::std::string* FileDescriptorProto::mutable_dependency(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.dependency)
-  return dependency_.Mutable(index);
-}
-void FileDescriptorProto::set_dependency(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.dependency)
-  dependency_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void FileDescriptorProto::set_dependency(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.dependency)
-  dependency_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void FileDescriptorProto::set_dependency(int index, const char* value) {
-  dependency_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.dependency)
-}
-void FileDescriptorProto::set_dependency(int index, const char* value, size_t size) {
-  dependency_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.dependency)
-}
-::std::string* FileDescriptorProto::add_dependency() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.FileDescriptorProto.dependency)
-  return dependency_.Add();
-}
-void FileDescriptorProto::add_dependency(const ::std::string& value) {
-  dependency_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.dependency)
-}
-#if LANG_CXX11
-void FileDescriptorProto::add_dependency(::std::string&& value) {
-  dependency_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.dependency)
-}
-#endif
-void FileDescriptorProto::add_dependency(const char* value) {
-  dependency_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.FileDescriptorProto.dependency)
-}
-void FileDescriptorProto::add_dependency(const char* value, size_t size) {
-  dependency_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.FileDescriptorProto.dependency)
-}
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-FileDescriptorProto::dependency() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.dependency)
-  return dependency_;
-}
-::google::protobuf::RepeatedPtrField< ::std::string>*
-FileDescriptorProto::mutable_dependency() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.dependency)
-  return &dependency_;
-}
-
-// repeated int32 public_dependency = 10;
-int FileDescriptorProto::public_dependency_size() const {
-  return public_dependency_.size();
-}
-void FileDescriptorProto::clear_public_dependency() {
-  public_dependency_.Clear();
-}
-::google::protobuf::int32 FileDescriptorProto::public_dependency(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.public_dependency)
-  return public_dependency_.Get(index);
-}
-void FileDescriptorProto::set_public_dependency(int index, ::google::protobuf::int32 value) {
-  public_dependency_.Set(index, value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.public_dependency)
-}
-void FileDescriptorProto::add_public_dependency(::google::protobuf::int32 value) {
-  public_dependency_.Add(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.public_dependency)
-}
-const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-FileDescriptorProto::public_dependency() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.public_dependency)
-  return public_dependency_;
-}
-::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-FileDescriptorProto::mutable_public_dependency() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.public_dependency)
-  return &public_dependency_;
-}
-
-// repeated int32 weak_dependency = 11;
-int FileDescriptorProto::weak_dependency_size() const {
-  return weak_dependency_.size();
-}
-void FileDescriptorProto::clear_weak_dependency() {
-  weak_dependency_.Clear();
-}
-::google::protobuf::int32 FileDescriptorProto::weak_dependency(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.weak_dependency)
-  return weak_dependency_.Get(index);
-}
-void FileDescriptorProto::set_weak_dependency(int index, ::google::protobuf::int32 value) {
-  weak_dependency_.Set(index, value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.weak_dependency)
-}
-void FileDescriptorProto::add_weak_dependency(::google::protobuf::int32 value) {
-  weak_dependency_.Add(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.weak_dependency)
-}
-const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-FileDescriptorProto::weak_dependency() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.weak_dependency)
-  return weak_dependency_;
-}
-::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-FileDescriptorProto::mutable_weak_dependency() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.weak_dependency)
-  return &weak_dependency_;
-}
-
-// repeated .google.protobuf.DescriptorProto message_type = 4;
-int FileDescriptorProto::message_type_size() const {
-  return message_type_.size();
-}
-void FileDescriptorProto::clear_message_type() {
-  message_type_.Clear();
-}
-const ::google::protobuf::DescriptorProto& FileDescriptorProto::message_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_.Get(index);
-}
-::google::protobuf::DescriptorProto* FileDescriptorProto::mutable_message_type(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_.Mutable(index);
-}
-::google::protobuf::DescriptorProto* FileDescriptorProto::add_message_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
-FileDescriptorProto::mutable_message_type() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.message_type)
-  return &message_type_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
-FileDescriptorProto::message_type() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_;
-}
-
-// repeated .google.protobuf.EnumDescriptorProto enum_type = 5;
-int FileDescriptorProto::enum_type_size() const {
-  return enum_type_.size();
-}
-void FileDescriptorProto::clear_enum_type() {
-  enum_type_.Clear();
-}
-const ::google::protobuf::EnumDescriptorProto& FileDescriptorProto::enum_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_.Get(index);
-}
-::google::protobuf::EnumDescriptorProto* FileDescriptorProto::mutable_enum_type(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_.Mutable(index);
-}
-::google::protobuf::EnumDescriptorProto* FileDescriptorProto::add_enum_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
-FileDescriptorProto::mutable_enum_type() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.enum_type)
-  return &enum_type_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
-FileDescriptorProto::enum_type() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_;
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// repeated .google.protobuf.ServiceDescriptorProto service = 6;
-int FileDescriptorProto::service_size() const {
-  return service_.size();
-}
-void FileDescriptorProto::clear_service() {
-  service_.Clear();
-}
-const ::google::protobuf::ServiceDescriptorProto& FileDescriptorProto::service(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.service)
-  return service_.Get(index);
-}
-::google::protobuf::ServiceDescriptorProto* FileDescriptorProto::mutable_service(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.service)
-  return service_.Mutable(index);
-}
-::google::protobuf::ServiceDescriptorProto* FileDescriptorProto::add_service() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.service)
-  return service_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >*
-FileDescriptorProto::mutable_service() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.service)
-  return &service_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >&
-FileDescriptorProto::service() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.service)
-  return service_;
-}
 
-// repeated .google.protobuf.FieldDescriptorProto extension = 7;
-int FileDescriptorProto::extension_size() const {
-  return extension_.size();
-}
-void FileDescriptorProto::clear_extension() {
-  extension_.Clear();
-}
-const ::google::protobuf::FieldDescriptorProto& FileDescriptorProto::extension(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.extension)
-  return extension_.Get(index);
-}
-::google::protobuf::FieldDescriptorProto* FileDescriptorProto::mutable_extension(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.extension)
-  return extension_.Mutable(index);
-}
-::google::protobuf::FieldDescriptorProto* FileDescriptorProto::add_extension() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.extension)
-  return extension_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
-FileDescriptorProto::mutable_extension() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.extension)
-  return &extension_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
-FileDescriptorProto::extension() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.extension)
-  return extension_;
-}
+// ===================================================================
 
-// optional .google.protobuf.FileOptions options = 8;
-bool FileDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void FileDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void FileDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void FileDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::FileOptions::Clear();
-  clear_has_options();
+void DescriptorProto_ExtensionRange::InitAsDefaultInstance() {
+  ::google::protobuf::_DescriptorProto_ExtensionRange_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::ExtensionRangeOptions*>(
+      ::google::protobuf::ExtensionRangeOptions::internal_default_instance());
 }
-const ::google::protobuf::FileOptions& FileDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::FileOptions::internal_default_instance();
-}
-::google::protobuf::FileOptions* FileDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::FileOptions;
+void DescriptorProto_ExtensionRange::unsafe_arena_set_allocated_options(
+    ::google::protobuf::ExtensionRangeOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::FileOptions* FileDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::FileOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void FileDescriptorProto::set_allocated_options(::google::protobuf::FileOptions* options) {
-  delete options_;
   options_ = options;
   if (options) {
     set_has_options();
   } else {
     clear_has_options();
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.options)
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.DescriptorProto.ExtensionRange.options)
 }
-
-// optional .google.protobuf.SourceCodeInfo source_code_info = 9;
-bool FileDescriptorProto::has_source_code_info() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void FileDescriptorProto::set_has_source_code_info() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void FileDescriptorProto::clear_has_source_code_info() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void FileDescriptorProto::clear_source_code_info() {
-  if (source_code_info_ != NULL) source_code_info_->::google::protobuf::SourceCodeInfo::Clear();
-  clear_has_source_code_info();
-}
-const ::google::protobuf::SourceCodeInfo& FileDescriptorProto::source_code_info() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.source_code_info)
-  return source_code_info_ != NULL ? *source_code_info_
-                         : *::google::protobuf::SourceCodeInfo::internal_default_instance();
-}
-::google::protobuf::SourceCodeInfo* FileDescriptorProto::mutable_source_code_info() {
-  set_has_source_code_info();
-  if (source_code_info_ == NULL) {
-    source_code_info_ = new ::google::protobuf::SourceCodeInfo;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.source_code_info)
-  return source_code_info_;
-}
-::google::protobuf::SourceCodeInfo* FileDescriptorProto::release_source_code_info() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.source_code_info)
-  clear_has_source_code_info();
-  ::google::protobuf::SourceCodeInfo* temp = source_code_info_;
-  source_code_info_ = NULL;
-  return temp;
-}
-void FileDescriptorProto::set_allocated_source_code_info(::google::protobuf::SourceCodeInfo* source_code_info) {
-  delete source_code_info_;
-  source_code_info_ = source_code_info;
-  if (source_code_info) {
-    set_has_source_code_info();
-  } else {
-    clear_has_source_code_info();
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.source_code_info)
-}
-
-// optional string syntax = 12;
-bool FileDescriptorProto::has_syntax() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void FileDescriptorProto::set_has_syntax() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void FileDescriptorProto::clear_has_syntax() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void FileDescriptorProto::clear_syntax() {
-  syntax_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_syntax();
-}
-const ::std::string& FileDescriptorProto::syntax() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.syntax)
-  return syntax_.GetNoArena();
-}
-void FileDescriptorProto::set_syntax(const ::std::string& value) {
-  set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.syntax)
-}
-#if LANG_CXX11
-void FileDescriptorProto::set_syntax(::std::string&& value) {
-  set_has_syntax();
-  syntax_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.syntax)
-}
-#endif
-void FileDescriptorProto::set_syntax(const char* value) {
-  set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.syntax)
-}
-void FileDescriptorProto::set_syntax(const char* value, size_t size) {
-  set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.syntax)
-}
-::std::string* FileDescriptorProto::mutable_syntax() {
-  set_has_syntax();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.syntax)
-  return syntax_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileDescriptorProto::release_syntax() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.syntax)
-  clear_has_syntax();
-  return syntax_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileDescriptorProto::set_allocated_syntax(::std::string* syntax) {
-  if (syntax != NULL) {
-    set_has_syntax();
-  } else {
-    clear_has_syntax();
-  }
-  syntax_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), syntax);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.syntax)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int DescriptorProto_ExtensionRange::kStartFieldNumber;
 const int DescriptorProto_ExtensionRange::kEndFieldNumber;
+const int DescriptorProto_ExtensionRange::kOptionsFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 DescriptorProto_ExtensionRange::DescriptorProto_ExtensionRange()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ExtensionRange.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.DescriptorProto.ExtensionRange)
 }
+DescriptorProto_ExtensionRange::DescriptorProto_ExtensionRange(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ExtensionRange.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.DescriptorProto.ExtensionRange)
+}
 DescriptorProto_ExtensionRange::DescriptorProto_ExtensionRange(const DescriptorProto_ExtensionRange& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  if (from.has_options()) {
+    options_ = new ::google::protobuf::ExtensionRangeOptions(*from.options_);
+  } else {
+    options_ = NULL;
+  }
   ::memcpy(&start_, &from.start_,
-    reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&start_) + sizeof(end_));
+    static_cast<size_t>(reinterpret_cast<char*>(&end_) -
+    reinterpret_cast<char*>(&start_)) + sizeof(end_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.DescriptorProto.ExtensionRange)
 }
 
 void DescriptorProto_ExtensionRange::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&start_, 0, reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&start_) + sizeof(end_));
+  ::memset(&options_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&end_) -
+      reinterpret_cast<char*>(&options_)) + sizeof(end_));
 }
 
 DescriptorProto_ExtensionRange::~DescriptorProto_ExtensionRange() {
@@ -2549,36 +2634,45 @@ DescriptorProto_ExtensionRange::~DescriptorProto_ExtensionRange() {
 }
 
 void DescriptorProto_ExtensionRange::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  if (this != internal_default_instance()) delete options_;
 }
 
+void DescriptorProto_ExtensionRange::ArenaDtor(void* object) {
+  DescriptorProto_ExtensionRange* _this = reinterpret_cast< DescriptorProto_ExtensionRange* >(object);
+  (void)_this;
+}
+void DescriptorProto_ExtensionRange::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void DescriptorProto_ExtensionRange::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* DescriptorProto_ExtensionRange::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const DescriptorProto_ExtensionRange& DescriptorProto_ExtensionRange::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ExtensionRange.base);
   return *internal_default_instance();
 }
 
-DescriptorProto_ExtensionRange* DescriptorProto_ExtensionRange::New(::google::protobuf::Arena* arena) const {
-  DescriptorProto_ExtensionRange* n = new DescriptorProto_ExtensionRange;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void DescriptorProto_ExtensionRange::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.DescriptorProto.ExtensionRange)
-  if (_has_bits_[0 / 32] & 3u) {
-    ::memset(&start_, 0, reinterpret_cast<char*>(&end_) -
-      reinterpret_cast<char*>(&start_) + sizeof(end_));
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 0x00000001u) {
+    GOOGLE_DCHECK(options_ != NULL);
+    options_->Clear();
+  }
+  if (cached_has_bits & 6u) {
+    ::memset(&start_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&end_) -
+        reinterpret_cast<char*>(&start_)) + sizeof(end_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -2590,14 +2684,14 @@ bool DescriptorProto_ExtensionRange::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.DescriptorProto.ExtensionRange)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional int32 start = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           set_has_start();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -2611,7 +2705,7 @@ bool DescriptorProto_ExtensionRange::MergePartialFromCodedStream(
       // optional int32 end = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_end();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -2622,15 +2716,25 @@ bool DescriptorProto_ExtensionRange::MergePartialFromCodedStream(
         break;
       }
 
+      // optional .google.protobuf.ExtensionRangeOptions options = 3;
+      case 3: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
+               input, mutable_options()));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2647,40 +2751,61 @@ failure:
 void DescriptorProto_ExtensionRange::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.DescriptorProto.ExtensionRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 start = 1;
-  if (has_start()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->start(), output);
   }
 
   // optional int32 end = 2;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->end(), output);
   }
 
+  // optional .google.protobuf.ExtensionRangeOptions options = 3;
+  if (cached_has_bits & 0x00000001u) {
+    ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
+      3, this->_internal_options(), output);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.DescriptorProto.ExtensionRange)
 }
 
 ::google::protobuf::uint8* DescriptorProto_ExtensionRange::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.DescriptorProto.ExtensionRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 start = 1;
-  if (has_start()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->start(), target);
   }
 
   // optional int32 end = 2;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->end(), target);
   }
 
+  // optional .google.protobuf.ExtensionRangeOptions options = 3;
+  if (cached_has_bits & 0x00000001u) {
+    target = ::google::protobuf::internal::WireFormatLite::
+      InternalWriteMessageToArray(
+        3, this->_internal_options(), deterministic, target);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.DescriptorProto.ExtensionRange)
   return target;
@@ -2693,9 +2818,16 @@ size_t DescriptorProto_ExtensionRange::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
-  if (_has_bits_[0 / 32] & 3u) {
+  if (_has_bits_[0 / 32] & 7u) {
+    // optional .google.protobuf.ExtensionRangeOptions options = 3;
+    if (has_options()) {
+      total_size += 1 +
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
+    }
+
     // optional int32 start = 1;
     if (has_start()) {
       total_size += 1 +
@@ -2712,9 +2844,7 @@ size_t DescriptorProto_ExtensionRange::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -2737,13 +2867,21 @@ void DescriptorProto_ExtensionRange::MergeFrom(const DescriptorProto_ExtensionRa
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.DescriptorProto.ExtensionRange)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_start()) {
-      set_start(from.start());
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
+      mutable_options()->::google::protobuf::ExtensionRangeOptions::MergeFrom(from.options());
+    }
+    if (cached_has_bits & 0x00000002u) {
+      start_ = from.start_;
     }
-    if (from.has_end()) {
-      set_end(from.end());
+    if (cached_has_bits & 0x00000004u) {
+      end_ = from.end_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -2762,81 +2900,50 @@ void DescriptorProto_ExtensionRange::CopyFrom(const DescriptorProto_ExtensionRan
 }
 
 bool DescriptorProto_ExtensionRange::IsInitialized() const {
+  if (has_options()) {
+    if (!this->options_->IsInitialized()) return false;
+  }
   return true;
 }
 
 void DescriptorProto_ExtensionRange::Swap(DescriptorProto_ExtensionRange* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    DescriptorProto_ExtensionRange* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void DescriptorProto_ExtensionRange::UnsafeArenaSwap(DescriptorProto_ExtensionRange* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void DescriptorProto_ExtensionRange::InternalSwap(DescriptorProto_ExtensionRange* other) {
-  std::swap(start_, other->start_);
-  std::swap(end_, other->end_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  swap(options_, other->options_);
+  swap(start_, other->start_);
+  swap(end_, other->end_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata DescriptorProto_ExtensionRange::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[2];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// DescriptorProto_ExtensionRange
-
-// optional int32 start = 1;
-bool DescriptorProto_ExtensionRange::has_start() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void DescriptorProto_ExtensionRange::set_has_start() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void DescriptorProto_ExtensionRange::clear_has_start() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void DescriptorProto_ExtensionRange::clear_start() {
-  start_ = 0;
-  clear_has_start();
-}
-::google::protobuf::int32 DescriptorProto_ExtensionRange::start() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.ExtensionRange.start)
-  return start_;
-}
-void DescriptorProto_ExtensionRange::set_start(::google::protobuf::int32 value) {
-  set_has_start();
-  start_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.ExtensionRange.start)
-}
-
-// optional int32 end = 2;
-bool DescriptorProto_ExtensionRange::has_end() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void DescriptorProto_ExtensionRange::set_has_end() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void DescriptorProto_ExtensionRange::clear_has_end() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void DescriptorProto_ExtensionRange::clear_end() {
-  end_ = 0;
-  clear_has_end();
-}
-::google::protobuf::int32 DescriptorProto_ExtensionRange::end() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.ExtensionRange.end)
-  return end_;
-}
-void DescriptorProto_ExtensionRange::set_end(::google::protobuf::int32 value) {
-  set_has_end();
-  end_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.ExtensionRange.end)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void DescriptorProto_ReservedRange::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int DescriptorProto_ReservedRange::kStartFieldNumber;
 const int DescriptorProto_ReservedRange::kEndFieldNumber;
@@ -2844,28 +2951,34 @@ const int DescriptorProto_ReservedRange::kEndFieldNumber;
 
 DescriptorProto_ReservedRange::DescriptorProto_ReservedRange()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ReservedRange.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.DescriptorProto.ReservedRange)
 }
+DescriptorProto_ReservedRange::DescriptorProto_ReservedRange(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ReservedRange.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.DescriptorProto.ReservedRange)
+}
 DescriptorProto_ReservedRange::DescriptorProto_ReservedRange(const DescriptorProto_ReservedRange& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   ::memcpy(&start_, &from.start_,
-    reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&start_) + sizeof(end_));
+    static_cast<size_t>(reinterpret_cast<char*>(&end_) -
+    reinterpret_cast<char*>(&start_)) + sizeof(end_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.DescriptorProto.ReservedRange)
 }
 
 void DescriptorProto_ReservedRange::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&start_, 0, reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&start_) + sizeof(end_));
+  ::memset(&start_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&end_) -
+      reinterpret_cast<char*>(&start_)) + sizeof(end_));
 }
 
 DescriptorProto_ReservedRange::~DescriptorProto_ReservedRange() {
@@ -2874,36 +2987,40 @@ DescriptorProto_ReservedRange::~DescriptorProto_ReservedRange() {
 }
 
 void DescriptorProto_ReservedRange::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void DescriptorProto_ReservedRange::ArenaDtor(void* object) {
+  DescriptorProto_ReservedRange* _this = reinterpret_cast< DescriptorProto_ReservedRange* >(object);
+  (void)_this;
+}
+void DescriptorProto_ReservedRange::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void DescriptorProto_ReservedRange::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* DescriptorProto_ReservedRange::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[3].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const DescriptorProto_ReservedRange& DescriptorProto_ReservedRange::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto_ReservedRange.base);
   return *internal_default_instance();
 }
 
-DescriptorProto_ReservedRange* DescriptorProto_ReservedRange::New(::google::protobuf::Arena* arena) const {
-  DescriptorProto_ReservedRange* n = new DescriptorProto_ReservedRange;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void DescriptorProto_ReservedRange::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.DescriptorProto.ReservedRange)
-  if (_has_bits_[0 / 32] & 3u) {
-    ::memset(&start_, 0, reinterpret_cast<char*>(&end_) -
-      reinterpret_cast<char*>(&start_) + sizeof(end_));
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    ::memset(&start_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&end_) -
+        reinterpret_cast<char*>(&start_)) + sizeof(end_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -2915,14 +3032,14 @@ bool DescriptorProto_ReservedRange::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.DescriptorProto.ReservedRange)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional int32 start = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           set_has_start();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -2936,7 +3053,7 @@ bool DescriptorProto_ReservedRange::MergePartialFromCodedStream(
       // optional int32 end = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_end();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -2949,13 +3066,11 @@ bool DescriptorProto_ReservedRange::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2972,40 +3087,48 @@ failure:
 void DescriptorProto_ReservedRange::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.DescriptorProto.ReservedRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 start = 1;
-  if (has_start()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->start(), output);
   }
 
   // optional int32 end = 2;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->end(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.DescriptorProto.ReservedRange)
 }
 
 ::google::protobuf::uint8* DescriptorProto_ReservedRange::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.DescriptorProto.ReservedRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional int32 start = 1;
-  if (has_start()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->start(), target);
   }
 
   // optional int32 end = 2;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->end(), target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.DescriptorProto.ReservedRange)
   return target;
@@ -3018,7 +3141,7 @@ size_t DescriptorProto_ReservedRange::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 3u) {
     // optional int32 start = 1;
@@ -3037,9 +3160,7 @@ size_t DescriptorProto_ReservedRange::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -3062,13 +3183,18 @@ void DescriptorProto_ReservedRange::MergeFrom(const DescriptorProto_ReservedRang
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.DescriptorProto.ReservedRange)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_start()) {
-      set_start(from.start());
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      start_ = from.start_;
     }
-    if (from.has_end()) {
-      set_end(from.end());
+    if (cached_has_bits & 0x00000002u) {
+      end_ = from.end_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -3092,76 +3218,56 @@ bool DescriptorProto_ReservedRange::IsInitialized() const {
 
 void DescriptorProto_ReservedRange::Swap(DescriptorProto_ReservedRange* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    DescriptorProto_ReservedRange* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void DescriptorProto_ReservedRange::UnsafeArenaSwap(DescriptorProto_ReservedRange* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void DescriptorProto_ReservedRange::InternalSwap(DescriptorProto_ReservedRange* other) {
-  std::swap(start_, other->start_);
-  std::swap(end_, other->end_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  swap(start_, other->start_);
+  swap(end_, other->end_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata DescriptorProto_ReservedRange::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[3];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// DescriptorProto_ReservedRange
 
-// optional int32 start = 1;
-bool DescriptorProto_ReservedRange::has_start() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void DescriptorProto_ReservedRange::set_has_start() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void DescriptorProto_ReservedRange::clear_has_start() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void DescriptorProto_ReservedRange::clear_start() {
-  start_ = 0;
-  clear_has_start();
-}
-::google::protobuf::int32 DescriptorProto_ReservedRange::start() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.ReservedRange.start)
-  return start_;
-}
-void DescriptorProto_ReservedRange::set_start(::google::protobuf::int32 value) {
-  set_has_start();
-  start_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.ReservedRange.start)
-}
+// ===================================================================
 
-// optional int32 end = 2;
-bool DescriptorProto_ReservedRange::has_end() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void DescriptorProto_ReservedRange::set_has_end() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void DescriptorProto_ReservedRange::clear_has_end() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void DescriptorProto_ReservedRange::clear_end() {
-  end_ = 0;
-  clear_has_end();
-}
-::google::protobuf::int32 DescriptorProto_ReservedRange::end() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.ReservedRange.end)
-  return end_;
+void DescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_DescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::MessageOptions*>(
+      ::google::protobuf::MessageOptions::internal_default_instance());
 }
-void DescriptorProto_ReservedRange::set_end(::google::protobuf::int32 value) {
-  set_has_end();
-  end_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.ReservedRange.end)
+void DescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::MessageOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
+  }
+  options_ = options;
+  if (options) {
+    set_has_options();
+  } else {
+    clear_has_options();
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.DescriptorProto.options)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int DescriptorProto::kNameFieldNumber;
 const int DescriptorProto::kFieldFieldNumber;
@@ -3177,29 +3283,44 @@ const int DescriptorProto::kReservedNameFieldNumber;
 
 DescriptorProto::DescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.DescriptorProto)
 }
+DescriptorProto::DescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  field_(arena),
+  nested_type_(arena),
+  enum_type_(arena),
+  extension_range_(arena),
+  extension_(arena),
+  oneof_decl_(arena),
+  reserved_range_(arena),
+  reserved_name_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.DescriptorProto)
+}
 DescriptorProto::DescriptorProto(const DescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       field_(from.field_),
-      extension_(from.extension_),
       nested_type_(from.nested_type_),
       enum_type_(from.enum_type_),
       extension_range_(from.extension_range_),
+      extension_(from.extension_),
       oneof_decl_(from.oneof_decl_),
       reserved_range_(from.reserved_range_),
       reserved_name_(from.reserved_name_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::MessageOptions(*from.options_);
@@ -3210,7 +3331,6 @@ DescriptorProto::DescriptorProto(const DescriptorProto& from)
 }
 
 void DescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   options_ = NULL;
 }
@@ -3221,53 +3341,53 @@ DescriptorProto::~DescriptorProto() {
 }
 
 void DescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void DescriptorProto::ArenaDtor(void* object) {
+  DescriptorProto* _this = reinterpret_cast< DescriptorProto* >(object);
+  (void)_this;
+}
+void DescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void DescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* DescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[4].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const DescriptorProto& DescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_DescriptorProto.base);
   return *internal_default_instance();
 }
 
-DescriptorProto* DescriptorProto::New(::google::protobuf::Arena* arena) const {
-  DescriptorProto* n = new DescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void DescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.DescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   field_.Clear();
-  extension_.Clear();
   nested_type_.Clear();
   enum_type_.Clear();
   extension_range_.Clear();
+  extension_.Clear();
   oneof_decl_.Clear();
   reserved_range_.Clear();
   reserved_name_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::MessageOptions::Clear();
+      options_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -3280,18 +3400,18 @@ bool DescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.DescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.DescriptorProto.name");
         } else {
@@ -3303,78 +3423,68 @@ bool DescriptorProto::MergePartialFromCodedStream(
       // repeated .google.protobuf.FieldDescriptorProto field = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_field()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.DescriptorProto nested_type = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_nested_type()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_enum_type()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(42u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_extension_range()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.FieldDescriptorProto extension = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_extension()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // optional .google.protobuf.MessageOptions options = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(58u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(58u /* 58 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -3385,40 +3495,36 @@ bool DescriptorProto::MergePartialFromCodedStream(
       // repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(66u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(66u /* 66 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_oneof_decl()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;
       case 9: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(74u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(74u /* 74 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_reserved_range()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated string reserved_name = 10;
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(82u)) {
+            static_cast< ::google::protobuf::uint8>(82u /* 82 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_reserved_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
             this->reserved_name(this->reserved_name_size() - 1).data(),
-            this->reserved_name(this->reserved_name_size() - 1).length(),
+            static_cast<int>(this->reserved_name(this->reserved_name_size() - 1).length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.DescriptorProto.reserved_name");
         } else {
@@ -3429,13 +3535,11 @@ bool DescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -3452,10 +3556,14 @@ failure:
 void DescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.DescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.DescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -3463,57 +3571,78 @@ void DescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.FieldDescriptorProto field = 2;
-  for (unsigned int i = 0, n = this->field_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->field_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->field(i), output);
+      2,
+      this->field(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.DescriptorProto nested_type = 3;
-  for (unsigned int i = 0, n = this->nested_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->nested_type_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, this->nested_type(i), output);
+      3,
+      this->nested_type(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
-  for (unsigned int i = 0, n = this->enum_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enum_type_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      4, this->enum_type(i), output);
+      4,
+      this->enum_type(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
-  for (unsigned int i = 0, n = this->extension_range_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_range_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      5, this->extension_range(i), output);
+      5,
+      this->extension_range(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.FieldDescriptorProto extension = 6;
-  for (unsigned int i = 0, n = this->extension_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      6, this->extension(i), output);
+      6,
+      this->extension(static_cast<int>(i)),
+      output);
   }
 
   // optional .google.protobuf.MessageOptions options = 7;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      7, *this->options_, output);
+      7, this->_internal_options(), output);
   }
 
   // repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
-  for (unsigned int i = 0, n = this->oneof_decl_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->oneof_decl_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      8, this->oneof_decl(i), output);
+      8,
+      this->oneof_decl(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;
-  for (unsigned int i = 0, n = this->reserved_range_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->reserved_range_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      9, this->reserved_range(i), output);
+      9,
+      this->reserved_range(static_cast<int>(i)),
+      output);
   }
 
   // repeated string reserved_name = 10;
   for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->reserved_name(i).data(), this->reserved_name(i).length(),
+      this->reserved_name(i).data(), static_cast<int>(this->reserved_name(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.DescriptorProto.reserved_name");
     ::google::protobuf::internal::WireFormatLite::WriteString(
@@ -3522,19 +3651,23 @@ void DescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.DescriptorProto)
 }
 
 ::google::protobuf::uint8* DescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.DescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.DescriptorProto.name");
     target =
@@ -3543,65 +3676,72 @@ void DescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.FieldDescriptorProto field = 2;
-  for (unsigned int i = 0, n = this->field_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->field_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->field(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->field(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.DescriptorProto nested_type = 3;
-  for (unsigned int i = 0, n = this->nested_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->nested_type_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, this->nested_type(i), false, target);
+      InternalWriteMessageToArray(
+        3, this->nested_type(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
-  for (unsigned int i = 0, n = this->enum_type_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enum_type_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        4, this->enum_type(i), false, target);
+      InternalWriteMessageToArray(
+        4, this->enum_type(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
-  for (unsigned int i = 0, n = this->extension_range_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_range_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        5, this->extension_range(i), false, target);
+      InternalWriteMessageToArray(
+        5, this->extension_range(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.FieldDescriptorProto extension = 6;
-  for (unsigned int i = 0, n = this->extension_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->extension_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        6, this->extension(i), false, target);
+      InternalWriteMessageToArray(
+        6, this->extension(static_cast<int>(i)), deterministic, target);
   }
 
   // optional .google.protobuf.MessageOptions options = 7;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        7, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        7, this->_internal_options(), deterministic, target);
   }
 
   // repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
-  for (unsigned int i = 0, n = this->oneof_decl_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->oneof_decl_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        8, this->oneof_decl(i), false, target);
+      InternalWriteMessageToArray(
+        8, this->oneof_decl(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;
-  for (unsigned int i = 0, n = this->reserved_range_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->reserved_range_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        9, this->reserved_range(i), false, target);
+      InternalWriteMessageToArray(
+        9, this->reserved_range(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated string reserved_name = 10;
   for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->reserved_name(i).data(), this->reserved_name(i).length(),
+      this->reserved_name(i).data(), static_cast<int>(this->reserved_name(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.DescriptorProto.reserved_name");
     target = ::google::protobuf::internal::WireFormatLite::
@@ -3610,7 +3750,7 @@ void DescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.DescriptorProto)
   return target;
@@ -3623,82 +3763,82 @@ size_t DescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.FieldDescriptorProto field = 2;
   {
-    unsigned int count = this->field_size();
+    unsigned int count = static_cast<unsigned int>(this->field_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->field(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->field(static_cast<int>(i)));
     }
   }
 
-  // repeated .google.protobuf.FieldDescriptorProto extension = 6;
+  // repeated .google.protobuf.DescriptorProto nested_type = 3;
   {
-    unsigned int count = this->extension_size();
+    unsigned int count = static_cast<unsigned int>(this->nested_type_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->extension(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->nested_type(static_cast<int>(i)));
     }
   }
 
-  // repeated .google.protobuf.DescriptorProto nested_type = 3;
+  // repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
   {
-    unsigned int count = this->nested_type_size();
+    unsigned int count = static_cast<unsigned int>(this->enum_type_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->nested_type(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->enum_type(static_cast<int>(i)));
     }
   }
 
-  // repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
+  // repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
   {
-    unsigned int count = this->enum_type_size();
+    unsigned int count = static_cast<unsigned int>(this->extension_range_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->enum_type(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->extension_range(static_cast<int>(i)));
     }
   }
 
-  // repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
+  // repeated .google.protobuf.FieldDescriptorProto extension = 6;
   {
-    unsigned int count = this->extension_range_size();
+    unsigned int count = static_cast<unsigned int>(this->extension_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->extension_range(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->extension(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
   {
-    unsigned int count = this->oneof_decl_size();
+    unsigned int count = static_cast<unsigned int>(this->oneof_decl_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->oneof_decl(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->oneof_decl(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;
   {
-    unsigned int count = this->reserved_range_size();
+    unsigned int count = static_cast<unsigned int>(this->reserved_range_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->reserved_range(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->reserved_range(static_cast<int>(i)));
     }
   }
 
@@ -3721,15 +3861,13 @@ size_t DescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.MessageOptions options = 7;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -3752,20 +3890,23 @@ void DescriptorProto::MergeFrom(const DescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.DescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   field_.MergeFrom(from.field_);
-  extension_.MergeFrom(from.extension_);
   nested_type_.MergeFrom(from.nested_type_);
   enum_type_.MergeFrom(from.enum_type_);
   extension_range_.MergeFrom(from.extension_range_);
+  extension_.MergeFrom(from.extension_);
   oneof_decl_.MergeFrom(from.oneof_decl_);
   reserved_range_.MergeFrom(from.reserved_range_);
   reserved_name_.MergeFrom(from.reserved_name_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_options()->::google::protobuf::MessageOptions::MergeFrom(from.options());
     }
   }
@@ -3787,9 +3928,10 @@ void DescriptorProto::CopyFrom(const DescriptorProto& from) {
 
 bool DescriptorProto::IsInitialized() const {
   if (!::google::protobuf::internal::AllAreInitialized(this->field())) return false;
-  if (!::google::protobuf::internal::AllAreInitialized(this->extension())) return false;
   if (!::google::protobuf::internal::AllAreInitialized(this->nested_type())) return false;
   if (!::google::protobuf::internal::AllAreInitialized(this->enum_type())) return false;
+  if (!::google::protobuf::internal::AllAreInitialized(this->extension_range())) return false;
+  if (!::google::protobuf::internal::AllAreInitialized(this->extension())) return false;
   if (!::google::protobuf::internal::AllAreInitialized(this->oneof_decl())) return false;
   if (has_options()) {
     if (!this->options_->IsInitialized()) return false;
@@ -3799,420 +3941,354 @@ bool DescriptorProto::IsInitialized() const {
 
 void DescriptorProto::Swap(DescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    DescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void DescriptorProto::UnsafeArenaSwap(DescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void DescriptorProto::InternalSwap(DescriptorProto* other) {
-  field_.UnsafeArenaSwap(&other->field_);
-  extension_.UnsafeArenaSwap(&other->extension_);
-  nested_type_.UnsafeArenaSwap(&other->nested_type_);
-  enum_type_.UnsafeArenaSwap(&other->enum_type_);
-  extension_range_.UnsafeArenaSwap(&other->extension_range_);
-  oneof_decl_.UnsafeArenaSwap(&other->oneof_decl_);
-  reserved_range_.UnsafeArenaSwap(&other->reserved_range_);
-  reserved_name_.UnsafeArenaSwap(&other->reserved_name_);
-  name_.Swap(&other->name_);
-  std::swap(options_, other->options_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&field_)->InternalSwap(CastToBase(&other->field_));
+  CastToBase(&nested_type_)->InternalSwap(CastToBase(&other->nested_type_));
+  CastToBase(&enum_type_)->InternalSwap(CastToBase(&other->enum_type_));
+  CastToBase(&extension_range_)->InternalSwap(CastToBase(&other->extension_range_));
+  CastToBase(&extension_)->InternalSwap(CastToBase(&other->extension_));
+  CastToBase(&oneof_decl_)->InternalSwap(CastToBase(&other->oneof_decl_));
+  CastToBase(&reserved_range_)->InternalSwap(CastToBase(&other->reserved_range_));
+  reserved_name_.InternalSwap(CastToBase(&other->reserved_name_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata DescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[4];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// DescriptorProto
 
-// optional string name = 1;
-bool DescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void DescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void DescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void DescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& DescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.name)
-  return name_.GetNoArena();
-}
-void DescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.name)
-}
-#if LANG_CXX11
-void DescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.DescriptorProto.name)
-}
-#endif
-void DescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.DescriptorProto.name)
-}
-void DescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.DescriptorProto.name)
-}
-::std::string* DescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* DescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.DescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void DescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.DescriptorProto.name)
-}
+// ===================================================================
 
-// repeated .google.protobuf.FieldDescriptorProto field = 2;
-int DescriptorProto::field_size() const {
-  return field_.size();
-}
-void DescriptorProto::clear_field() {
-  field_.Clear();
-}
-const ::google::protobuf::FieldDescriptorProto& DescriptorProto::field(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.field)
-  return field_.Get(index);
-}
-::google::protobuf::FieldDescriptorProto* DescriptorProto::mutable_field(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.field)
-  return field_.Mutable(index);
-}
-::google::protobuf::FieldDescriptorProto* DescriptorProto::add_field() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.field)
-  return field_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
-DescriptorProto::mutable_field() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.field)
-  return &field_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
-DescriptorProto::field() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.field)
-  return field_;
+void ExtensionRangeOptions::InitAsDefaultInstance() {
 }
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+const int ExtensionRangeOptions::kUninterpretedOptionFieldNumber;
+#endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
-// repeated .google.protobuf.FieldDescriptorProto extension = 6;
-int DescriptorProto::extension_size() const {
-  return extension_.size();
-}
-void DescriptorProto::clear_extension() {
-  extension_.Clear();
-}
-const ::google::protobuf::FieldDescriptorProto& DescriptorProto::extension(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension)
-  return extension_.Get(index);
-}
-::google::protobuf::FieldDescriptorProto* DescriptorProto::mutable_extension(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.extension)
-  return extension_.Mutable(index);
-}
-::google::protobuf::FieldDescriptorProto* DescriptorProto::add_extension() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension)
-  return extension_.Add();
+ExtensionRangeOptions::ExtensionRangeOptions()
+  : ::google::protobuf::Message(), _internal_metadata_(NULL) {
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ExtensionRangeOptions.base);
+  SharedCtor();
+  // @@protoc_insertion_point(constructor:google.protobuf.ExtensionRangeOptions)
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
-DescriptorProto::mutable_extension() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.extension)
-  return &extension_;
+ExtensionRangeOptions::ExtensionRangeOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ExtensionRangeOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.ExtensionRangeOptions)
 }
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
-DescriptorProto::extension() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.extension)
-  return extension_;
+ExtensionRangeOptions::ExtensionRangeOptions(const ExtensionRangeOptions& from)
+  : ::google::protobuf::Message(),
+      _internal_metadata_(NULL),
+      _has_bits_(from._has_bits_),
+      uninterpreted_option_(from.uninterpreted_option_) {
+  _internal_metadata_.MergeFrom(from._internal_metadata_);
+  _extensions_.MergeFrom(from._extensions_);
+  // @@protoc_insertion_point(copy_constructor:google.protobuf.ExtensionRangeOptions)
 }
 
-// repeated .google.protobuf.DescriptorProto nested_type = 3;
-int DescriptorProto::nested_type_size() const {
-  return nested_type_.size();
-}
-void DescriptorProto::clear_nested_type() {
-  nested_type_.Clear();
-}
-const ::google::protobuf::DescriptorProto& DescriptorProto::nested_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_.Get(index);
-}
-::google::protobuf::DescriptorProto* DescriptorProto::mutable_nested_type(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_.Mutable(index);
-}
-::google::protobuf::DescriptorProto* DescriptorProto::add_nested_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
-DescriptorProto::mutable_nested_type() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.nested_type)
-  return &nested_type_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
-DescriptorProto::nested_type() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_;
+void ExtensionRangeOptions::SharedCtor() {
 }
 
-// repeated .google.protobuf.EnumDescriptorProto enum_type = 4;
-int DescriptorProto::enum_type_size() const {
-  return enum_type_.size();
-}
-void DescriptorProto::clear_enum_type() {
-  enum_type_.Clear();
-}
-const ::google::protobuf::EnumDescriptorProto& DescriptorProto::enum_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_.Get(index);
-}
-::google::protobuf::EnumDescriptorProto* DescriptorProto::mutable_enum_type(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_.Mutable(index);
-}
-::google::protobuf::EnumDescriptorProto* DescriptorProto::add_enum_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
-DescriptorProto::mutable_enum_type() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.enum_type)
-  return &enum_type_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
-DescriptorProto::enum_type() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_;
+ExtensionRangeOptions::~ExtensionRangeOptions() {
+  // @@protoc_insertion_point(destructor:google.protobuf.ExtensionRangeOptions)
+  SharedDtor();
 }
 
-// repeated .google.protobuf.DescriptorProto.ExtensionRange extension_range = 5;
-int DescriptorProto::extension_range_size() const {
-  return extension_range_.size();
-}
-void DescriptorProto::clear_extension_range() {
-  extension_range_.Clear();
-}
-const ::google::protobuf::DescriptorProto_ExtensionRange& DescriptorProto::extension_range(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_.Get(index);
-}
-::google::protobuf::DescriptorProto_ExtensionRange* DescriptorProto::mutable_extension_range(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_.Mutable(index);
-}
-::google::protobuf::DescriptorProto_ExtensionRange* DescriptorProto::add_extension_range() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >*
-DescriptorProto::mutable_extension_range() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.extension_range)
-  return &extension_range_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >&
-DescriptorProto::extension_range() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_;
+void ExtensionRangeOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
-// repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
-int DescriptorProto::oneof_decl_size() const {
-  return oneof_decl_.size();
-}
-void DescriptorProto::clear_oneof_decl() {
-  oneof_decl_.Clear();
-}
-const ::google::protobuf::OneofDescriptorProto& DescriptorProto::oneof_decl(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_.Get(index);
+void ExtensionRangeOptions::ArenaDtor(void* object) {
+  ExtensionRangeOptions* _this = reinterpret_cast< ExtensionRangeOptions* >(object);
+  (void)_this;
 }
-::google::protobuf::OneofDescriptorProto* DescriptorProto::mutable_oneof_decl(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_.Mutable(index);
+void ExtensionRangeOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
 }
-::google::protobuf::OneofDescriptorProto* DescriptorProto::add_oneof_decl() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_.Add();
+void ExtensionRangeOptions::SetCachedSize(int size) const {
+  _cached_size_.Set(size);
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >*
-DescriptorProto::mutable_oneof_decl() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.oneof_decl)
-  return &oneof_decl_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >&
-DescriptorProto::oneof_decl() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_;
+const ::google::protobuf::Descriptor* ExtensionRangeOptions::descriptor() {
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
-// optional .google.protobuf.MessageOptions options = 7;
-bool DescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void DescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000002u;
+const ExtensionRangeOptions& ExtensionRangeOptions::default_instance() {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ExtensionRangeOptions.base);
+  return *internal_default_instance();
 }
-void DescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000002u;
+
+
+void ExtensionRangeOptions::Clear() {
+// @@protoc_insertion_point(message_clear_start:google.protobuf.ExtensionRangeOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _extensions_.Clear();
+  uninterpreted_option_.Clear();
+  _has_bits_.Clear();
+  _internal_metadata_.Clear();
 }
-void DescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::MessageOptions::Clear();
-  clear_has_options();
+
+bool ExtensionRangeOptions::MergePartialFromCodedStream(
+    ::google::protobuf::io::CodedInputStream* input) {
+#define DO_(EXPRESSION) if (!GOOGLE_PREDICT_TRUE(EXPRESSION)) goto failure
+  ::google::protobuf::uint32 tag;
+  // @@protoc_insertion_point(parse_start:google.protobuf.ExtensionRangeOptions)
+  for (;;) {
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    tag = p.first;
+    if (!p.second) goto handle_unusual;
+    switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
+      // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+      case 999: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
+                input, add_uninterpreted_option()));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      default: {
+      handle_unusual:
+        if (tag == 0) {
+          goto success;
+        }
+        if ((8000u <= tag)) {
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
+          continue;
+        }
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
+        break;
+      }
+    }
+  }
+success:
+  // @@protoc_insertion_point(parse_success:google.protobuf.ExtensionRangeOptions)
+  return true;
+failure:
+  // @@protoc_insertion_point(parse_failure:google.protobuf.ExtensionRangeOptions)
+  return false;
+#undef DO_
 }
-const ::google::protobuf::MessageOptions& DescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::MessageOptions::internal_default_instance();
+
+void ExtensionRangeOptions::SerializeWithCachedSizes(
+    ::google::protobuf::io::CodedOutputStream* output) const {
+  // @@protoc_insertion_point(serialize_start:google.protobuf.ExtensionRangeOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
+    ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
+  }
+
+  // Extension range [1000, 536870912)
+  _extensions_.SerializeWithCachedSizes(
+      1000, 536870912, output);
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        _internal_metadata_.unknown_fields(), output);
+  }
+  // @@protoc_insertion_point(serialize_end:google.protobuf.ExtensionRangeOptions)
 }
-::google::protobuf::MessageOptions* DescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::MessageOptions;
+
+::google::protobuf::uint8* ExtensionRangeOptions::InternalSerializeWithCachedSizesToArray(
+    bool deterministic, ::google::protobuf::uint8* target) const {
+  (void)deterministic; // Unused
+  // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.ExtensionRangeOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
+    target = ::google::protobuf::internal::WireFormatLite::
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
+  }
+
+  // Extension range [1000, 536870912)
+  target = _extensions_.InternalSerializeWithCachedSizesToArray(
+      1000, 536870912, deterministic, target);
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        _internal_metadata_.unknown_fields(), target);
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.options)
-  return options_;
+  // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.ExtensionRangeOptions)
+  return target;
 }
-::google::protobuf::MessageOptions* DescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.DescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::MessageOptions* temp = options_;
-  options_ = NULL;
-  return temp;
+
+size_t ExtensionRangeOptions::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:google.protobuf.ExtensionRangeOptions)
+  size_t total_size = 0;
+
+  total_size += _extensions_.ByteSize();
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        _internal_metadata_.unknown_fields());
+  }
+  // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+  {
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
+    total_size += 2UL * count;
+    for (unsigned int i = 0; i < count; i++) {
+      total_size +=
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
+    }
+  }
+
+  int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
+  SetCachedSize(cached_size);
+  return total_size;
 }
-void DescriptorProto::set_allocated_options(::google::protobuf::MessageOptions* options) {
-  delete options_;
-  options_ = options;
-  if (options) {
-    set_has_options();
+
+void ExtensionRangeOptions::MergeFrom(const ::google::protobuf::Message& from) {
+// @@protoc_insertion_point(generalized_merge_from_start:google.protobuf.ExtensionRangeOptions)
+  GOOGLE_DCHECK_NE(&from, this);
+  const ExtensionRangeOptions* source =
+      ::google::protobuf::internal::DynamicCastToGenerated<const ExtensionRangeOptions>(
+          &from);
+  if (source == NULL) {
+  // @@protoc_insertion_point(generalized_merge_from_cast_fail:google.protobuf.ExtensionRangeOptions)
+    ::google::protobuf::internal::ReflectionOps::Merge(from, this);
   } else {
-    clear_has_options();
+  // @@protoc_insertion_point(generalized_merge_from_cast_success:google.protobuf.ExtensionRangeOptions)
+    MergeFrom(*source);
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.DescriptorProto.options)
 }
 
-// repeated .google.protobuf.DescriptorProto.ReservedRange reserved_range = 9;
-int DescriptorProto::reserved_range_size() const {
-  return reserved_range_.size();
-}
-void DescriptorProto::clear_reserved_range() {
-  reserved_range_.Clear();
-}
-const ::google::protobuf::DescriptorProto_ReservedRange& DescriptorProto::reserved_range(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_.Get(index);
-}
-::google::protobuf::DescriptorProto_ReservedRange* DescriptorProto::mutable_reserved_range(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_.Mutable(index);
-}
-::google::protobuf::DescriptorProto_ReservedRange* DescriptorProto::add_reserved_range() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >*
-DescriptorProto::mutable_reserved_range() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.reserved_range)
-  return &reserved_range_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >&
-DescriptorProto::reserved_range() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_;
-}
+void ExtensionRangeOptions::MergeFrom(const ExtensionRangeOptions& from) {
+// @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.ExtensionRangeOptions)
+  GOOGLE_DCHECK_NE(&from, this);
+  _extensions_.MergeFrom(from._extensions_);
+  _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
 
-// repeated string reserved_name = 10;
-int DescriptorProto::reserved_name_size() const {
-  return reserved_name_.size();
-}
-void DescriptorProto::clear_reserved_name() {
-  reserved_name_.Clear();
-}
-const ::std::string& DescriptorProto::reserved_name(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.reserved_name)
-  return reserved_name_.Get(index);
-}
-::std::string* DescriptorProto::mutable_reserved_name(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.reserved_name)
-  return reserved_name_.Mutable(index);
-}
-void DescriptorProto::set_reserved_name(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.reserved_name)
-  reserved_name_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void DescriptorProto::set_reserved_name(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.reserved_name)
-  reserved_name_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void DescriptorProto::set_reserved_name(int index, const char* value) {
-  reserved_name_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.DescriptorProto.reserved_name)
-}
-void DescriptorProto::set_reserved_name(int index, const char* value, size_t size) {
-  reserved_name_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.DescriptorProto.reserved_name)
+  uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
 }
-::std::string* DescriptorProto::add_reserved_name() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.DescriptorProto.reserved_name)
-  return reserved_name_.Add();
+
+void ExtensionRangeOptions::CopyFrom(const ::google::protobuf::Message& from) {
+// @@protoc_insertion_point(generalized_copy_from_start:google.protobuf.ExtensionRangeOptions)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
 }
-void DescriptorProto::add_reserved_name(const ::std::string& value) {
-  reserved_name_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_name)
+
+void ExtensionRangeOptions::CopyFrom(const ExtensionRangeOptions& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:google.protobuf.ExtensionRangeOptions)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
 }
-#if LANG_CXX11
-void DescriptorProto::add_reserved_name(::std::string&& value) {
-  reserved_name_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_name)
+
+bool ExtensionRangeOptions::IsInitialized() const {
+  if (!_extensions_.IsInitialized()) {
+    return false;
+  }
+
+  if (!::google::protobuf::internal::AllAreInitialized(this->uninterpreted_option())) return false;
+  return true;
 }
-#endif
-void DescriptorProto::add_reserved_name(const char* value) {
-  reserved_name_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.DescriptorProto.reserved_name)
+
+void ExtensionRangeOptions::Swap(ExtensionRangeOptions* other) {
+  if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    ExtensionRangeOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
 }
-void DescriptorProto::add_reserved_name(const char* value, size_t size) {
-  reserved_name_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.DescriptorProto.reserved_name)
+void ExtensionRangeOptions::UnsafeArenaSwap(ExtensionRangeOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
+  InternalSwap(other);
 }
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-DescriptorProto::reserved_name() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.reserved_name)
-  return reserved_name_;
+void ExtensionRangeOptions::InternalSwap(ExtensionRangeOptions* other) {
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(_has_bits_[0], other->_has_bits_[0]);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
+  _extensions_.Swap(&other->_extensions_);
 }
-::google::protobuf::RepeatedPtrField< ::std::string>*
-DescriptorProto::mutable_reserved_name() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.reserved_name)
-  return &reserved_name_;
+
+::google::protobuf::Metadata ExtensionRangeOptions::GetMetadata() const {
+  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void FieldDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_FieldDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::FieldOptions*>(
+      ::google::protobuf::FieldOptions::internal_default_instance());
+}
+void FieldDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::FieldOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
+  }
+  options_ = options;
+  if (options) {
+    set_has_options();
+  } else {
+    clear_has_options();
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.options)
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FieldDescriptorProto::kNameFieldNumber;
 const int FieldDescriptorProto::kNumberFieldNumber;
@@ -4228,37 +4304,48 @@ const int FieldDescriptorProto::kOptionsFieldNumber;
 
 FieldDescriptorProto::FieldDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FieldDescriptorProto)
 }
+FieldDescriptorProto::FieldDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.FieldDescriptorProto)
+}
 FieldDescriptorProto::FieldDescriptorProto(const FieldDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
-  }
-  type_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (from.has_type_name()) {
-    type_name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.type_name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   extendee_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_extendee()) {
-    extendee_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.extendee_);
+    extendee_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.extendee(),
+      GetArenaNoVirtual());
+  }
+  type_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (from.has_type_name()) {
+    type_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.type_name(),
+      GetArenaNoVirtual());
   }
   default_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_default_value()) {
-    default_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.default_value_);
+    default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.default_value(),
+      GetArenaNoVirtual());
   }
   json_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_json_name()) {
-    json_name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.json_name_);
+    json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.json_name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::FieldOptions(*from.options_);
@@ -4266,20 +4353,20 @@ FieldDescriptorProto::FieldDescriptorProto(const FieldDescriptorProto& from)
     options_ = NULL;
   }
   ::memcpy(&number_, &from.number_,
-    reinterpret_cast<char*>(&type_) -
-    reinterpret_cast<char*>(&number_) + sizeof(type_));
+    static_cast<size_t>(reinterpret_cast<char*>(&type_) -
+    reinterpret_cast<char*>(&number_)) + sizeof(type_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FieldDescriptorProto)
 }
 
 void FieldDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  type_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   extendee_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  type_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   default_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   json_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&options_, 0, reinterpret_cast<char*>(&oneof_index_) -
-    reinterpret_cast<char*>(&options_) + sizeof(oneof_index_));
+  ::memset(&options_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&oneof_index_) -
+      reinterpret_cast<char*>(&options_)) + sizeof(oneof_index_));
   label_ = 1;
   type_ = 1;
 }
@@ -4290,72 +4377,69 @@ FieldDescriptorProto::~FieldDescriptorProto() {
 }
 
 void FieldDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  type_name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   extendee_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  type_name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   default_value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   json_name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void FieldDescriptorProto::ArenaDtor(void* object) {
+  FieldDescriptorProto* _this = reinterpret_cast< FieldDescriptorProto* >(object);
+  (void)_this;
+}
+void FieldDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void FieldDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FieldDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[5].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FieldDescriptorProto& FieldDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldDescriptorProto.base);
   return *internal_default_instance();
 }
 
-FieldDescriptorProto* FieldDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  FieldDescriptorProto* n = new FieldDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FieldDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FieldDescriptorProto)
-  if (_has_bits_[0 / 32] & 63u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 63u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_type_name()) {
-      GOOGLE_DCHECK(!type_name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*type_name_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      extendee_.ClearNonDefaultToEmpty();
     }
-    if (has_extendee()) {
-      GOOGLE_DCHECK(!extendee_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*extendee_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      type_name_.ClearNonDefaultToEmpty();
     }
-    if (has_default_value()) {
-      GOOGLE_DCHECK(!default_value_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*default_value_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000008u) {
+      default_value_.ClearNonDefaultToEmpty();
     }
-    if (has_json_name()) {
-      GOOGLE_DCHECK(!json_name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*json_name_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000010u) {
+      json_name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000020u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::FieldOptions::Clear();
+      options_->Clear();
     }
   }
-  if (_has_bits_[0 / 32] & 192u) {
-    ::memset(&number_, 0, reinterpret_cast<char*>(&oneof_index_) -
-      reinterpret_cast<char*>(&number_) + sizeof(oneof_index_));
+  if (cached_has_bits & 192u) {
+    ::memset(&number_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&oneof_index_) -
+        reinterpret_cast<char*>(&number_)) + sizeof(oneof_index_));
   }
-  if (_has_bits_[8 / 32] & 768u) {
+  if (cached_has_bits & 768u) {
     label_ = 1;
     type_ = 1;
   }
@@ -4369,18 +4453,18 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FieldDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FieldDescriptorProto.name");
         } else {
@@ -4392,11 +4476,11 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional string extendee = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_extendee()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->extendee().data(), this->extendee().length(),
+            this->extendee().data(), static_cast<int>(this->extendee().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FieldDescriptorProto.extendee");
         } else {
@@ -4408,7 +4492,7 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional int32 number = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_number();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -4422,7 +4506,7 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.FieldDescriptorProto.Label label = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(32u)) {
+            static_cast< ::google::protobuf::uint8>(32u /* 32 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -4430,7 +4514,8 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
           if (::google::protobuf::FieldDescriptorProto_Label_IsValid(value)) {
             set_label(static_cast< ::google::protobuf::FieldDescriptorProto_Label >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(4, value);
+            mutable_unknown_fields()->AddVarint(
+                4, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -4441,7 +4526,7 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.FieldDescriptorProto.Type type = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -4449,7 +4534,8 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
           if (::google::protobuf::FieldDescriptorProto_Type_IsValid(value)) {
             set_type(static_cast< ::google::protobuf::FieldDescriptorProto_Type >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(5, value);
+            mutable_unknown_fields()->AddVarint(
+                5, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -4460,11 +4546,11 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional string type_name = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_type_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->type_name().data(), this->type_name().length(),
+            this->type_name().data(), static_cast<int>(this->type_name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FieldDescriptorProto.type_name");
         } else {
@@ -4476,11 +4562,11 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional string default_value = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(58u)) {
+            static_cast< ::google::protobuf::uint8>(58u /* 58 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_default_value()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->default_value().data(), this->default_value().length(),
+            this->default_value().data(), static_cast<int>(this->default_value().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FieldDescriptorProto.default_value");
         } else {
@@ -4492,8 +4578,8 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.FieldOptions options = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(66u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(66u /* 66 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -4504,7 +4590,7 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional int32 oneof_index = 9;
       case 9: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(72u)) {
+            static_cast< ::google::protobuf::uint8>(72u /* 72 & 0xFF */)) {
           set_has_oneof_index();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -4518,11 +4604,11 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
       // optional string json_name = 10;
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(82u)) {
+            static_cast< ::google::protobuf::uint8>(82u /* 82 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_json_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->json_name().data(), this->json_name().length(),
+            this->json_name().data(), static_cast<int>(this->json_name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FieldDescriptorProto.json_name");
         } else {
@@ -4533,13 +4619,11 @@ bool FieldDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -4556,10 +4640,14 @@ failure:
 void FieldDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FieldDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -4567,9 +4655,9 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string extendee = 2;
-  if (has_extendee()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->extendee().data(), this->extendee().length(),
+      this->extendee().data(), static_cast<int>(this->extendee().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.extendee");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -4577,26 +4665,26 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional int32 number = 3;
-  if (has_number()) {
+  if (cached_has_bits & 0x00000040u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(3, this->number(), output);
   }
 
   // optional .google.protobuf.FieldDescriptorProto.Label label = 4;
-  if (has_label()) {
+  if (cached_has_bits & 0x00000100u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       4, this->label(), output);
   }
 
   // optional .google.protobuf.FieldDescriptorProto.Type type = 5;
-  if (has_type()) {
+  if (cached_has_bits & 0x00000200u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       5, this->type(), output);
   }
 
   // optional string type_name = 6;
-  if (has_type_name()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->type_name().data(), this->type_name().length(),
+      this->type_name().data(), static_cast<int>(this->type_name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.type_name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -4604,9 +4692,9 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string default_value = 7;
-  if (has_default_value()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->default_value().data(), this->default_value().length(),
+      this->default_value().data(), static_cast<int>(this->default_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.default_value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -4614,20 +4702,20 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.FieldOptions options = 8;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      8, *this->options_, output);
+      8, this->_internal_options(), output);
   }
 
   // optional int32 oneof_index = 9;
-  if (has_oneof_index()) {
+  if (cached_has_bits & 0x00000080u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(9, this->oneof_index(), output);
   }
 
   // optional string json_name = 10;
-  if (has_json_name()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->json_name().data(), this->json_name().length(),
+      this->json_name().data(), static_cast<int>(this->json_name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.json_name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -4636,19 +4724,23 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FieldDescriptorProto)
 }
 
 ::google::protobuf::uint8* FieldDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FieldDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.name");
     target =
@@ -4657,9 +4749,9 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string extendee = 2;
-  if (has_extendee()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->extendee().data(), this->extendee().length(),
+      this->extendee().data(), static_cast<int>(this->extendee().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.extendee");
     target =
@@ -4668,26 +4760,26 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional int32 number = 3;
-  if (has_number()) {
+  if (cached_has_bits & 0x00000040u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(3, this->number(), target);
   }
 
   // optional .google.protobuf.FieldDescriptorProto.Label label = 4;
-  if (has_label()) {
+  if (cached_has_bits & 0x00000100u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       4, this->label(), target);
   }
 
   // optional .google.protobuf.FieldDescriptorProto.Type type = 5;
-  if (has_type()) {
+  if (cached_has_bits & 0x00000200u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       5, this->type(), target);
   }
 
   // optional string type_name = 6;
-  if (has_type_name()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->type_name().data(), this->type_name().length(),
+      this->type_name().data(), static_cast<int>(this->type_name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.type_name");
     target =
@@ -4696,9 +4788,9 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string default_value = 7;
-  if (has_default_value()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->default_value().data(), this->default_value().length(),
+      this->default_value().data(), static_cast<int>(this->default_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.default_value");
     target =
@@ -4707,21 +4799,21 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.FieldOptions options = 8;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000020u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        8, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        8, this->_internal_options(), deterministic, target);
   }
 
   // optional int32 oneof_index = 9;
-  if (has_oneof_index()) {
+  if (cached_has_bits & 0x00000080u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(9, this->oneof_index(), target);
   }
 
   // optional string json_name = 10;
-  if (has_json_name()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->json_name().data(), this->json_name().length(),
+      this->json_name().data(), static_cast<int>(this->json_name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FieldDescriptorProto.json_name");
     target =
@@ -4731,7 +4823,7 @@ void FieldDescriptorProto::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FieldDescriptorProto)
   return target;
@@ -4744,7 +4836,7 @@ size_t FieldDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 255u) {
     // optional string name = 1;
@@ -4754,18 +4846,18 @@ size_t FieldDescriptorProto::ByteSizeLong() const {
           this->name());
     }
 
-    // optional string type_name = 6;
-    if (has_type_name()) {
+    // optional string extendee = 2;
+    if (has_extendee()) {
       total_size += 1 +
         ::google::protobuf::internal::WireFormatLite::StringSize(
-          this->type_name());
+          this->extendee());
     }
 
-    // optional string extendee = 2;
-    if (has_extendee()) {
+    // optional string type_name = 6;
+    if (has_type_name()) {
       total_size += 1 +
         ::google::protobuf::internal::WireFormatLite::StringSize(
-          this->extendee());
+          this->type_name());
     }
 
     // optional string default_value = 7;
@@ -4785,8 +4877,8 @@ size_t FieldDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.FieldOptions options = 8;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
     // optional int32 number = 3;
@@ -4819,9 +4911,7 @@ size_t FieldDescriptorProto::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -4844,44 +4934,45 @@ void FieldDescriptorProto::MergeFrom(const FieldDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.FieldDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 255u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 255u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_type_name()) {
-      set_has_type_name();
-      type_name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.type_name_);
+    if (cached_has_bits & 0x00000002u) {
+      set_extendee(from.extendee());
     }
-    if (from.has_extendee()) {
-      set_has_extendee();
-      extendee_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.extendee_);
+    if (cached_has_bits & 0x00000004u) {
+      set_type_name(from.type_name());
     }
-    if (from.has_default_value()) {
-      set_has_default_value();
-      default_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.default_value_);
+    if (cached_has_bits & 0x00000008u) {
+      set_default_value(from.default_value());
     }
-    if (from.has_json_name()) {
-      set_has_json_name();
-      json_name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.json_name_);
+    if (cached_has_bits & 0x00000010u) {
+      set_json_name(from.json_name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000020u) {
       mutable_options()->::google::protobuf::FieldOptions::MergeFrom(from.options());
     }
-    if (from.has_number()) {
-      set_number(from.number());
+    if (cached_has_bits & 0x00000040u) {
+      number_ = from.number_;
     }
-    if (from.has_oneof_index()) {
-      set_oneof_index(from.oneof_index());
+    if (cached_has_bits & 0x00000080u) {
+      oneof_index_ = from.oneof_index_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
-  if (from._has_bits_[8 / 32] & 768u) {
-    if (from.has_label()) {
-      set_label(from.label());
+  if (cached_has_bits & 768u) {
+    if (cached_has_bits & 0x00000100u) {
+      label_ = from.label_;
     }
-    if (from.has_type()) {
-      set_type(from.type());
+    if (cached_has_bits & 0x00000200u) {
+      type_ = from.type_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -4908,489 +4999,69 @@ bool FieldDescriptorProto::IsInitialized() const {
 
 void FieldDescriptorProto::Swap(FieldDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    FieldDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void FieldDescriptorProto::UnsafeArenaSwap(FieldDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void FieldDescriptorProto::InternalSwap(FieldDescriptorProto* other) {
-  name_.Swap(&other->name_);
-  type_name_.Swap(&other->type_name_);
-  extendee_.Swap(&other->extendee_);
-  default_value_.Swap(&other->default_value_);
-  json_name_.Swap(&other->json_name_);
-  std::swap(options_, other->options_);
-  std::swap(number_, other->number_);
-  std::swap(oneof_index_, other->oneof_index_);
-  std::swap(label_, other->label_);
-  std::swap(type_, other->type_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  extendee_.Swap(&other->extendee_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  type_name_.Swap(&other->type_name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  default_value_.Swap(&other->default_value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  json_name_.Swap(&other->json_name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(number_, other->number_);
+  swap(oneof_index_, other->oneof_index_);
+  swap(label_, other->label_);
+  swap(type_, other->type_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata FieldDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[5];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FieldDescriptorProto
 
-// optional string name = 1;
-bool FieldDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void FieldDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void FieldDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void FieldDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& FieldDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void FieldDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.name)
-}
-#if LANG_CXX11
-void FieldDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.name)
-}
-#endif
-void FieldDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.name)
-}
-void FieldDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.name)
-}
-::std::string* FieldDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FieldDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FieldDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.name)
-}
-
-// optional int32 number = 3;
-bool FieldDescriptorProto::has_number() const {
-  return (_has_bits_[0] & 0x00000040u) != 0;
-}
-void FieldDescriptorProto::set_has_number() {
-  _has_bits_[0] |= 0x00000040u;
-}
-void FieldDescriptorProto::clear_has_number() {
-  _has_bits_[0] &= ~0x00000040u;
-}
-void FieldDescriptorProto::clear_number() {
-  number_ = 0;
-  clear_has_number();
-}
-::google::protobuf::int32 FieldDescriptorProto::number() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.number)
-  return number_;
-}
-void FieldDescriptorProto::set_number(::google::protobuf::int32 value) {
-  set_has_number();
-  number_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.number)
-}
-
-// optional .google.protobuf.FieldDescriptorProto.Label label = 4;
-bool FieldDescriptorProto::has_label() const {
-  return (_has_bits_[0] & 0x00000100u) != 0;
-}
-void FieldDescriptorProto::set_has_label() {
-  _has_bits_[0] |= 0x00000100u;
-}
-void FieldDescriptorProto::clear_has_label() {
-  _has_bits_[0] &= ~0x00000100u;
-}
-void FieldDescriptorProto::clear_label() {
-  label_ = 1;
-  clear_has_label();
-}
-::google::protobuf::FieldDescriptorProto_Label FieldDescriptorProto::label() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.label)
-  return static_cast< ::google::protobuf::FieldDescriptorProto_Label >(label_);
-}
-void FieldDescriptorProto::set_label(::google::protobuf::FieldDescriptorProto_Label value) {
-  assert(::google::protobuf::FieldDescriptorProto_Label_IsValid(value));
-  set_has_label();
-  label_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.label)
-}
-
-// optional .google.protobuf.FieldDescriptorProto.Type type = 5;
-bool FieldDescriptorProto::has_type() const {
-  return (_has_bits_[0] & 0x00000200u) != 0;
-}
-void FieldDescriptorProto::set_has_type() {
-  _has_bits_[0] |= 0x00000200u;
-}
-void FieldDescriptorProto::clear_has_type() {
-  _has_bits_[0] &= ~0x00000200u;
-}
-void FieldDescriptorProto::clear_type() {
-  type_ = 1;
-  clear_has_type();
-}
-::google::protobuf::FieldDescriptorProto_Type FieldDescriptorProto::type() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.type)
-  return static_cast< ::google::protobuf::FieldDescriptorProto_Type >(type_);
-}
-void FieldDescriptorProto::set_type(::google::protobuf::FieldDescriptorProto_Type value) {
-  assert(::google::protobuf::FieldDescriptorProto_Type_IsValid(value));
-  set_has_type();
-  type_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.type)
-}
-
-// optional string type_name = 6;
-bool FieldDescriptorProto::has_type_name() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void FieldDescriptorProto::set_has_type_name() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void FieldDescriptorProto::clear_has_type_name() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void FieldDescriptorProto::clear_type_name() {
-  type_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_type_name();
-}
-const ::std::string& FieldDescriptorProto::type_name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.type_name)
-  return type_name_.GetNoArena();
-}
-void FieldDescriptorProto::set_type_name(const ::std::string& value) {
-  set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.type_name)
-}
-#if LANG_CXX11
-void FieldDescriptorProto::set_type_name(::std::string&& value) {
-  set_has_type_name();
-  type_name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.type_name)
-}
-#endif
-void FieldDescriptorProto::set_type_name(const char* value) {
-  set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.type_name)
-}
-void FieldDescriptorProto::set_type_name(const char* value, size_t size) {
-  set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.type_name)
-}
-::std::string* FieldDescriptorProto::mutable_type_name() {
-  set_has_type_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.type_name)
-  return type_name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FieldDescriptorProto::release_type_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.type_name)
-  clear_has_type_name();
-  return type_name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FieldDescriptorProto::set_allocated_type_name(::std::string* type_name) {
-  if (type_name != NULL) {
-    set_has_type_name();
-  } else {
-    clear_has_type_name();
-  }
-  type_name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), type_name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.type_name)
-}
-
-// optional string extendee = 2;
-bool FieldDescriptorProto::has_extendee() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void FieldDescriptorProto::set_has_extendee() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void FieldDescriptorProto::clear_has_extendee() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void FieldDescriptorProto::clear_extendee() {
-  extendee_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_extendee();
-}
-const ::std::string& FieldDescriptorProto::extendee() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.extendee)
-  return extendee_.GetNoArena();
-}
-void FieldDescriptorProto::set_extendee(const ::std::string& value) {
-  set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.extendee)
-}
-#if LANG_CXX11
-void FieldDescriptorProto::set_extendee(::std::string&& value) {
-  set_has_extendee();
-  extendee_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.extendee)
-}
-#endif
-void FieldDescriptorProto::set_extendee(const char* value) {
-  set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.extendee)
-}
-void FieldDescriptorProto::set_extendee(const char* value, size_t size) {
-  set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.extendee)
-}
-::std::string* FieldDescriptorProto::mutable_extendee() {
-  set_has_extendee();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.extendee)
-  return extendee_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FieldDescriptorProto::release_extendee() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.extendee)
-  clear_has_extendee();
-  return extendee_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FieldDescriptorProto::set_allocated_extendee(::std::string* extendee) {
-  if (extendee != NULL) {
-    set_has_extendee();
-  } else {
-    clear_has_extendee();
-  }
-  extendee_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), extendee);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.extendee)
-}
-
-// optional string default_value = 7;
-bool FieldDescriptorProto::has_default_value() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void FieldDescriptorProto::set_has_default_value() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void FieldDescriptorProto::clear_has_default_value() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void FieldDescriptorProto::clear_default_value() {
-  default_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_default_value();
-}
-const ::std::string& FieldDescriptorProto::default_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.default_value)
-  return default_value_.GetNoArena();
-}
-void FieldDescriptorProto::set_default_value(const ::std::string& value) {
-  set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.default_value)
-}
-#if LANG_CXX11
-void FieldDescriptorProto::set_default_value(::std::string&& value) {
-  set_has_default_value();
-  default_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.default_value)
-}
-#endif
-void FieldDescriptorProto::set_default_value(const char* value) {
-  set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.default_value)
-}
-void FieldDescriptorProto::set_default_value(const char* value, size_t size) {
-  set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.default_value)
-}
-::std::string* FieldDescriptorProto::mutable_default_value() {
-  set_has_default_value();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.default_value)
-  return default_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FieldDescriptorProto::release_default_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.default_value)
-  clear_has_default_value();
-  return default_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FieldDescriptorProto::set_allocated_default_value(::std::string* default_value) {
-  if (default_value != NULL) {
-    set_has_default_value();
-  } else {
-    clear_has_default_value();
-  }
-  default_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), default_value);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.default_value)
-}
-
-// optional int32 oneof_index = 9;
-bool FieldDescriptorProto::has_oneof_index() const {
-  return (_has_bits_[0] & 0x00000080u) != 0;
-}
-void FieldDescriptorProto::set_has_oneof_index() {
-  _has_bits_[0] |= 0x00000080u;
-}
-void FieldDescriptorProto::clear_has_oneof_index() {
-  _has_bits_[0] &= ~0x00000080u;
-}
-void FieldDescriptorProto::clear_oneof_index() {
-  oneof_index_ = 0;
-  clear_has_oneof_index();
-}
-::google::protobuf::int32 FieldDescriptorProto::oneof_index() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.oneof_index)
-  return oneof_index_;
-}
-void FieldDescriptorProto::set_oneof_index(::google::protobuf::int32 value) {
-  set_has_oneof_index();
-  oneof_index_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.oneof_index)
-}
-
-// optional string json_name = 10;
-bool FieldDescriptorProto::has_json_name() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void FieldDescriptorProto::set_has_json_name() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void FieldDescriptorProto::clear_has_json_name() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void FieldDescriptorProto::clear_json_name() {
-  json_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_json_name();
-}
-const ::std::string& FieldDescriptorProto::json_name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.json_name)
-  return json_name_.GetNoArena();
-}
-void FieldDescriptorProto::set_json_name(const ::std::string& value) {
-  set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.json_name)
-}
-#if LANG_CXX11
-void FieldDescriptorProto::set_json_name(::std::string&& value) {
-  set_has_json_name();
-  json_name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.json_name)
-}
-#endif
-void FieldDescriptorProto::set_json_name(const char* value) {
-  set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.json_name)
-}
-void FieldDescriptorProto::set_json_name(const char* value, size_t size) {
-  set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.json_name)
-}
-::std::string* FieldDescriptorProto::mutable_json_name() {
-  set_has_json_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.json_name)
-  return json_name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FieldDescriptorProto::release_json_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.json_name)
-  clear_has_json_name();
-  return json_name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FieldDescriptorProto::set_allocated_json_name(::std::string* json_name) {
-  if (json_name != NULL) {
-    set_has_json_name();
-  } else {
-    clear_has_json_name();
-  }
-  json_name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), json_name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.json_name)
-}
+// ===================================================================
 
-// optional .google.protobuf.FieldOptions options = 8;
-bool FieldDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
-}
-void FieldDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000020u;
-}
-void FieldDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000020u;
-}
-void FieldDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::FieldOptions::Clear();
-  clear_has_options();
-}
-const ::google::protobuf::FieldOptions& FieldDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::FieldOptions::internal_default_instance();
+void OneofDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_OneofDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::OneofOptions*>(
+      ::google::protobuf::OneofOptions::internal_default_instance());
 }
-::google::protobuf::FieldOptions* FieldDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::FieldOptions;
+void OneofDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::OneofOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::FieldOptions* FieldDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::FieldOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void FieldDescriptorProto::set_allocated_options(::google::protobuf::FieldOptions* options) {
-  delete options_;
   options_ = options;
   if (options) {
     set_has_options();
   } else {
     clear_has_options();
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.options)
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.OneofDescriptorProto.options)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int OneofDescriptorProto::kNameFieldNumber;
 const int OneofDescriptorProto::kOptionsFieldNumber;
@@ -5398,21 +5069,28 @@ const int OneofDescriptorProto::kOptionsFieldNumber;
 
 OneofDescriptorProto::OneofDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.OneofDescriptorProto)
 }
+OneofDescriptorProto::OneofDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.OneofDescriptorProto)
+}
 OneofDescriptorProto::OneofDescriptorProto(const OneofDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::OneofOptions(*from.options_);
@@ -5423,7 +5101,6 @@ OneofDescriptorProto::OneofDescriptorProto(const OneofDescriptorProto& from)
 }
 
 void OneofDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   options_ = NULL;
 }
@@ -5434,45 +5111,45 @@ OneofDescriptorProto::~OneofDescriptorProto() {
 }
 
 void OneofDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void OneofDescriptorProto::ArenaDtor(void* object) {
+  OneofDescriptorProto* _this = reinterpret_cast< OneofDescriptorProto* >(object);
+  (void)_this;
+}
+void OneofDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void OneofDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* OneofDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[6].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const OneofDescriptorProto& OneofDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofDescriptorProto.base);
   return *internal_default_instance();
 }
 
-OneofDescriptorProto* OneofDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  OneofDescriptorProto* n = new OneofDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void OneofDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.OneofDescriptorProto)
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::OneofOptions::Clear();
+      options_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -5485,18 +5162,18 @@ bool OneofDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.OneofDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.OneofDescriptorProto.name");
         } else {
@@ -5508,8 +5185,8 @@ bool OneofDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.OneofOptions options = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -5519,13 +5196,11 @@ bool OneofDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -5542,10 +5217,14 @@ failure:
 void OneofDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.OneofDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.OneofDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -5553,26 +5232,30 @@ void OneofDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.OneofOptions options = 2;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, *this->options_, output);
+      2, this->_internal_options(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.OneofDescriptorProto)
 }
 
 ::google::protobuf::uint8* OneofDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.OneofDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.OneofDescriptorProto.name");
     target =
@@ -5581,15 +5264,15 @@ void OneofDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.OneofOptions options = 2;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        2, this->_internal_options(), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.OneofDescriptorProto)
   return target;
@@ -5602,7 +5285,7 @@ size_t OneofDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 3u) {
     // optional string name = 1;
@@ -5615,15 +5298,13 @@ size_t OneofDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.OneofOptions options = 2;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -5646,12 +5327,15 @@ void OneofDescriptorProto::MergeFrom(const OneofDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.OneofDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_options()->::google::protobuf::OneofOptions::MergeFrom(from.options());
     }
   }
@@ -5680,159 +5364,404 @@ bool OneofDescriptorProto::IsInitialized() const {
 
 void OneofDescriptorProto::Swap(OneofDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    OneofDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void OneofDescriptorProto::UnsafeArenaSwap(OneofDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void OneofDescriptorProto::InternalSwap(OneofDescriptorProto* other) {
-  name_.Swap(&other->name_);
-  std::swap(options_, other->options_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata OneofDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[6];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// OneofDescriptorProto
 
-// optional string name = 1;
-bool OneofDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
+// ===================================================================
+
+void EnumDescriptorProto_EnumReservedRange::InitAsDefaultInstance() {
 }
-void OneofDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+const int EnumDescriptorProto_EnumReservedRange::kStartFieldNumber;
+const int EnumDescriptorProto_EnumReservedRange::kEndFieldNumber;
+#endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
+
+EnumDescriptorProto_EnumReservedRange::EnumDescriptorProto_EnumReservedRange()
+  : ::google::protobuf::Message(), _internal_metadata_(NULL) {
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto_EnumReservedRange.base);
+  SharedCtor();
+  // @@protoc_insertion_point(constructor:google.protobuf.EnumDescriptorProto.EnumReservedRange)
 }
-void OneofDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
+EnumDescriptorProto_EnumReservedRange::EnumDescriptorProto_EnumReservedRange(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto_EnumReservedRange.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumDescriptorProto.EnumReservedRange)
 }
-void OneofDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
+EnumDescriptorProto_EnumReservedRange::EnumDescriptorProto_EnumReservedRange(const EnumDescriptorProto_EnumReservedRange& from)
+  : ::google::protobuf::Message(),
+      _internal_metadata_(NULL),
+      _has_bits_(from._has_bits_) {
+  _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::memcpy(&start_, &from.start_,
+    static_cast<size_t>(reinterpret_cast<char*>(&end_) -
+    reinterpret_cast<char*>(&start_)) + sizeof(end_));
+  // @@protoc_insertion_point(copy_constructor:google.protobuf.EnumDescriptorProto.EnumReservedRange)
 }
-const ::std::string& OneofDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.OneofDescriptorProto.name)
-  return name_.GetNoArena();
+
+void EnumDescriptorProto_EnumReservedRange::SharedCtor() {
+  ::memset(&start_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&end_) -
+      reinterpret_cast<char*>(&start_)) + sizeof(end_));
 }
-void OneofDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.OneofDescriptorProto.name)
+
+EnumDescriptorProto_EnumReservedRange::~EnumDescriptorProto_EnumReservedRange() {
+  // @@protoc_insertion_point(destructor:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  SharedDtor();
 }
-#if LANG_CXX11
-void OneofDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.OneofDescriptorProto.name)
+
+void EnumDescriptorProto_EnumReservedRange::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
-#endif
-void OneofDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.OneofDescriptorProto.name)
-}
-void OneofDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.OneofDescriptorProto.name)
-}
-::std::string* OneofDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.OneofDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* OneofDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.OneofDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void OneofDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
+
+void EnumDescriptorProto_EnumReservedRange::ArenaDtor(void* object) {
+  EnumDescriptorProto_EnumReservedRange* _this = reinterpret_cast< EnumDescriptorProto_EnumReservedRange* >(object);
+  (void)_this;
+}
+void EnumDescriptorProto_EnumReservedRange::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
+void EnumDescriptorProto_EnumReservedRange::SetCachedSize(int size) const {
+  _cached_size_.Set(size);
+}
+const ::google::protobuf::Descriptor* EnumDescriptorProto_EnumReservedRange::descriptor() {
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
+}
+
+const EnumDescriptorProto_EnumReservedRange& EnumDescriptorProto_EnumReservedRange::default_instance() {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto_EnumReservedRange.base);
+  return *internal_default_instance();
+}
+
+
+void EnumDescriptorProto_EnumReservedRange::Clear() {
+// @@protoc_insertion_point(message_clear_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    ::memset(&start_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&end_) -
+        reinterpret_cast<char*>(&start_)) + sizeof(end_));
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.OneofDescriptorProto.name)
+  _has_bits_.Clear();
+  _internal_metadata_.Clear();
 }
 
-// optional .google.protobuf.OneofOptions options = 2;
-bool OneofDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
+bool EnumDescriptorProto_EnumReservedRange::MergePartialFromCodedStream(
+    ::google::protobuf::io::CodedInputStream* input) {
+#define DO_(EXPRESSION) if (!GOOGLE_PREDICT_TRUE(EXPRESSION)) goto failure
+  ::google::protobuf::uint32 tag;
+  // @@protoc_insertion_point(parse_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  for (;;) {
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    tag = p.first;
+    if (!p.second) goto handle_unusual;
+    switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
+      // optional int32 start = 1;
+      case 1: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
+          set_has_start();
+          DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                   ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
+                 input, &start_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // optional int32 end = 2;
+      case 2: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
+          set_has_end();
+          DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                   ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
+                 input, &end_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      default: {
+      handle_unusual:
+        if (tag == 0) {
+          goto success;
+        }
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
+        break;
+      }
+    }
+  }
+success:
+  // @@protoc_insertion_point(parse_success:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  return true;
+failure:
+  // @@protoc_insertion_point(parse_failure:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  return false;
+#undef DO_
 }
-void OneofDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000002u;
+
+void EnumDescriptorProto_EnumReservedRange::SerializeWithCachedSizes(
+    ::google::protobuf::io::CodedOutputStream* output) const {
+  // @@protoc_insertion_point(serialize_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  // optional int32 start = 1;
+  if (cached_has_bits & 0x00000001u) {
+    ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->start(), output);
+  }
+
+  // optional int32 end = 2;
+  if (cached_has_bits & 0x00000002u) {
+    ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->end(), output);
+  }
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        _internal_metadata_.unknown_fields(), output);
+  }
+  // @@protoc_insertion_point(serialize_end:google.protobuf.EnumDescriptorProto.EnumReservedRange)
 }
-void OneofDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000002u;
+
+::google::protobuf::uint8* EnumDescriptorProto_EnumReservedRange::InternalSerializeWithCachedSizesToArray(
+    bool deterministic, ::google::protobuf::uint8* target) const {
+  (void)deterministic; // Unused
+  // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  // optional int32 start = 1;
+  if (cached_has_bits & 0x00000001u) {
+    target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->start(), target);
+  }
+
+  // optional int32 end = 2;
+  if (cached_has_bits & 0x00000002u) {
+    target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->end(), target);
+  }
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        _internal_metadata_.unknown_fields(), target);
+  }
+  // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  return target;
 }
-void OneofDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::OneofOptions::Clear();
-  clear_has_options();
+
+size_t EnumDescriptorProto_EnumReservedRange::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  size_t total_size = 0;
+
+  if (_internal_metadata_.have_unknown_fields()) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        _internal_metadata_.unknown_fields());
+  }
+  if (_has_bits_[0 / 32] & 3u) {
+    // optional int32 start = 1;
+    if (has_start()) {
+      total_size += 1 +
+        ::google::protobuf::internal::WireFormatLite::Int32Size(
+          this->start());
+    }
+
+    // optional int32 end = 2;
+    if (has_end()) {
+      total_size += 1 +
+        ::google::protobuf::internal::WireFormatLite::Int32Size(
+          this->end());
+    }
+
+  }
+  int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
+  SetCachedSize(cached_size);
+  return total_size;
 }
-const ::google::protobuf::OneofOptions& OneofDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.OneofDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::OneofOptions::internal_default_instance();
+
+void EnumDescriptorProto_EnumReservedRange::MergeFrom(const ::google::protobuf::Message& from) {
+// @@protoc_insertion_point(generalized_merge_from_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  GOOGLE_DCHECK_NE(&from, this);
+  const EnumDescriptorProto_EnumReservedRange* source =
+      ::google::protobuf::internal::DynamicCastToGenerated<const EnumDescriptorProto_EnumReservedRange>(
+          &from);
+  if (source == NULL) {
+  // @@protoc_insertion_point(generalized_merge_from_cast_fail:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+    ::google::protobuf::internal::ReflectionOps::Merge(from, this);
+  } else {
+  // @@protoc_insertion_point(generalized_merge_from_cast_success:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+    MergeFrom(*source);
+  }
 }
-::google::protobuf::OneofOptions* OneofDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::OneofOptions;
+
+void EnumDescriptorProto_EnumReservedRange::MergeFrom(const EnumDescriptorProto_EnumReservedRange& from) {
+// @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  GOOGLE_DCHECK_NE(&from, this);
+  _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      start_ = from.start_;
+    }
+    if (cached_has_bits & 0x00000002u) {
+      end_ = from.end_;
+    }
+    _has_bits_[0] |= cached_has_bits;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.OneofDescriptorProto.options)
-  return options_;
 }
-::google::protobuf::OneofOptions* OneofDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.OneofDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::OneofOptions* temp = options_;
-  options_ = NULL;
-  return temp;
+
+void EnumDescriptorProto_EnumReservedRange::CopyFrom(const ::google::protobuf::Message& from) {
+// @@protoc_insertion_point(generalized_copy_from_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
 }
-void OneofDescriptorProto::set_allocated_options(::google::protobuf::OneofOptions* options) {
-  delete options_;
-  options_ = options;
-  if (options) {
-    set_has_options();
+
+void EnumDescriptorProto_EnumReservedRange::CopyFrom(const EnumDescriptorProto_EnumReservedRange& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool EnumDescriptorProto_EnumReservedRange::IsInitialized() const {
+  return true;
+}
+
+void EnumDescriptorProto_EnumReservedRange::Swap(EnumDescriptorProto_EnumReservedRange* other) {
+  if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
   } else {
-    clear_has_options();
+    EnumDescriptorProto_EnumReservedRange* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.OneofDescriptorProto.options)
+}
+void EnumDescriptorProto_EnumReservedRange::UnsafeArenaSwap(EnumDescriptorProto_EnumReservedRange* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
+  InternalSwap(other);
+}
+void EnumDescriptorProto_EnumReservedRange::InternalSwap(EnumDescriptorProto_EnumReservedRange* other) {
+  using std::swap;
+  swap(start_, other->start_);
+  swap(end_, other->end_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
+}
+
+::google::protobuf::Metadata EnumDescriptorProto_EnumReservedRange::GetMetadata() const {
+  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void EnumDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_EnumDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::EnumOptions*>(
+      ::google::protobuf::EnumOptions::internal_default_instance());
+}
+void EnumDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::EnumOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
+  }
+  options_ = options;
+  if (options) {
+    set_has_options();
+  } else {
+    clear_has_options();
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.EnumDescriptorProto.options)
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int EnumDescriptorProto::kNameFieldNumber;
 const int EnumDescriptorProto::kValueFieldNumber;
 const int EnumDescriptorProto::kOptionsFieldNumber;
+const int EnumDescriptorProto::kReservedRangeFieldNumber;
+const int EnumDescriptorProto::kReservedNameFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 EnumDescriptorProto::EnumDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.EnumDescriptorProto)
 }
+EnumDescriptorProto::EnumDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  value_(arena),
+  reserved_range_(arena),
+  reserved_name_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumDescriptorProto)
+}
 EnumDescriptorProto::EnumDescriptorProto(const EnumDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
-      value_(from.value_) {
+      value_(from.value_),
+      reserved_range_(from.reserved_range_),
+      reserved_name_(from.reserved_name_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::EnumOptions(*from.options_);
@@ -5843,7 +5772,6 @@ EnumDescriptorProto::EnumDescriptorProto(const EnumDescriptorProto& from)
 }
 
 void EnumDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   options_ = NULL;
 }
@@ -5854,46 +5782,48 @@ EnumDescriptorProto::~EnumDescriptorProto() {
 }
 
 void EnumDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void EnumDescriptorProto::ArenaDtor(void* object) {
+  EnumDescriptorProto* _this = reinterpret_cast< EnumDescriptorProto* >(object);
+  (void)_this;
+}
+void EnumDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void EnumDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* EnumDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[7].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const EnumDescriptorProto& EnumDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumDescriptorProto.base);
   return *internal_default_instance();
 }
 
-EnumDescriptorProto* EnumDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  EnumDescriptorProto* n = new EnumDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void EnumDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.EnumDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  reserved_range_.Clear();
+  reserved_name_.Clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::EnumOptions::Clear();
+      options_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -5906,18 +5836,18 @@ bool EnumDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.EnumDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.EnumDescriptorProto.name");
         } else {
@@ -5929,22 +5859,20 @@ bool EnumDescriptorProto::MergePartialFromCodedStream(
       // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_value()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // optional .google.protobuf.EnumOptions options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -5952,15 +5880,42 @@ bool EnumDescriptorProto::MergePartialFromCodedStream(
         break;
       }
 
+      // repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+      case 4: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
+                input, add_reserved_range()));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // repeated string reserved_name = 5;
+      case 5: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadString(
+                input, this->add_reserved_name()));
+          ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+            this->reserved_name(this->reserved_name_size() - 1).data(),
+            static_cast<int>(this->reserved_name(this->reserved_name_size() - 1).length()),
+            ::google::protobuf::internal::WireFormat::PARSE,
+            "google.protobuf.EnumDescriptorProto.reserved_name");
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -5977,10 +5932,14 @@ failure:
 void EnumDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.EnumDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.EnumDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -5988,32 +5947,58 @@ void EnumDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
-  for (unsigned int i = 0, n = this->value_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->value_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->value(i), output);
+      2,
+      this->value(static_cast<int>(i)),
+      output);
   }
 
   // optional .google.protobuf.EnumOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
+    ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
+      3, this->_internal_options(), output);
+  }
+
+  // repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->reserved_range_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, *this->options_, output);
+      4,
+      this->reserved_range(static_cast<int>(i)),
+      output);
+  }
+
+  // repeated string reserved_name = 5;
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->reserved_name(i).data(), static_cast<int>(this->reserved_name(i).length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.EnumDescriptorProto.reserved_name");
+    ::google::protobuf::internal::WireFormatLite::WriteString(
+      5, this->reserved_name(i), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.EnumDescriptorProto)
 }
 
 ::google::protobuf::uint8* EnumDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.EnumDescriptorProto.name");
     target =
@@ -6022,22 +6007,41 @@ void EnumDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
-  for (unsigned int i = 0, n = this->value_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->value_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->value(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->value(static_cast<int>(i)), deterministic, target);
   }
 
   // optional .google.protobuf.EnumOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
+    target = ::google::protobuf::internal::WireFormatLite::
+      InternalWriteMessageToArray(
+        3, this->_internal_options(), deterministic, target);
+  }
+
+  // repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->reserved_range_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        4, this->reserved_range(static_cast<int>(i)), deterministic, target);
+  }
+
+  // repeated string reserved_name = 5;
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->reserved_name(i).data(), static_cast<int>(this->reserved_name(i).length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.EnumDescriptorProto.reserved_name");
+    target = ::google::protobuf::internal::WireFormatLite::
+      WriteStringToArray(5, this->reserved_name(i), target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumDescriptorProto)
   return target;
@@ -6050,19 +6054,38 @@ size_t EnumDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
   {
-    unsigned int count = this->value_size();
+    unsigned int count = static_cast<unsigned int>(this->value_size());
+    total_size += 1UL * count;
+    for (unsigned int i = 0; i < count; i++) {
+      total_size +=
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->value(static_cast<int>(i)));
+    }
+  }
+
+  // repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+  {
+    unsigned int count = static_cast<unsigned int>(this->reserved_range_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->value(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->reserved_range(static_cast<int>(i)));
     }
   }
 
+  // repeated string reserved_name = 5;
+  total_size += 1 *
+      ::google::protobuf::internal::FromIntSize(this->reserved_name_size());
+  for (int i = 0, n = this->reserved_name_size(); i < n; i++) {
+    total_size += ::google::protobuf::internal::WireFormatLite::StringSize(
+      this->reserved_name(i));
+  }
+
   if (_has_bits_[0 / 32] & 3u) {
     // optional string name = 1;
     if (has_name()) {
@@ -6074,15 +6097,13 @@ size_t EnumDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.EnumOptions options = 3;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -6105,13 +6126,18 @@ void EnumDescriptorProto::MergeFrom(const EnumDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.EnumDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   value_.MergeFrom(from.value_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  reserved_range_.MergeFrom(from.reserved_range_);
+  reserved_name_.MergeFrom(from.reserved_name_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_options()->::google::protobuf::EnumOptions::MergeFrom(from.options());
     }
   }
@@ -6141,166 +6167,60 @@ bool EnumDescriptorProto::IsInitialized() const {
 
 void EnumDescriptorProto::Swap(EnumDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    EnumDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void EnumDescriptorProto::UnsafeArenaSwap(EnumDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void EnumDescriptorProto::InternalSwap(EnumDescriptorProto* other) {
-  value_.UnsafeArenaSwap(&other->value_);
-  name_.Swap(&other->name_);
-  std::swap(options_, other->options_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&value_)->InternalSwap(CastToBase(&other->value_));
+  CastToBase(&reserved_range_)->InternalSwap(CastToBase(&other->reserved_range_));
+  reserved_name_.InternalSwap(CastToBase(&other->reserved_name_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata EnumDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[7];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// EnumDescriptorProto
-
-// optional string name = 1;
-bool EnumDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void EnumDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void EnumDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void EnumDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& EnumDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void EnumDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.name)
-}
-#if LANG_CXX11
-void EnumDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.EnumDescriptorProto.name)
-}
-#endif
-void EnumDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.EnumDescriptorProto.name)
-}
-void EnumDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumDescriptorProto.name)
-}
-::std::string* EnumDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* EnumDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.EnumDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void EnumDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumDescriptorProto.name)
-}
 
-// repeated .google.protobuf.EnumValueDescriptorProto value = 2;
-int EnumDescriptorProto::value_size() const {
-  return value_.size();
-}
-void EnumDescriptorProto::clear_value() {
-  value_.Clear();
-}
-const ::google::protobuf::EnumValueDescriptorProto& EnumDescriptorProto::value(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.value)
-  return value_.Get(index);
-}
-::google::protobuf::EnumValueDescriptorProto* EnumDescriptorProto::mutable_value(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.value)
-  return value_.Mutable(index);
-}
-::google::protobuf::EnumValueDescriptorProto* EnumDescriptorProto::add_value() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.value)
-  return value_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >*
-EnumDescriptorProto::mutable_value() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumDescriptorProto.value)
-  return &value_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >&
-EnumDescriptorProto::value() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.EnumDescriptorProto.value)
-  return value_;
-}
+// ===================================================================
 
-// optional .google.protobuf.EnumOptions options = 3;
-bool EnumDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void EnumDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void EnumDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void EnumDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::EnumOptions::Clear();
-  clear_has_options();
-}
-const ::google::protobuf::EnumOptions& EnumDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::EnumOptions::internal_default_instance();
+void EnumValueDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_EnumValueDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::EnumValueOptions*>(
+      ::google::protobuf::EnumValueOptions::internal_default_instance());
 }
-::google::protobuf::EnumOptions* EnumDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::EnumOptions;
+void EnumValueDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::EnumValueOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::EnumOptions* EnumDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.EnumDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::EnumOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void EnumDescriptorProto::set_allocated_options(::google::protobuf::EnumOptions* options) {
-  delete options_;
   options_ = options;
   if (options) {
     set_has_options();
   } else {
     clear_has_options();
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumDescriptorProto.options)
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.EnumValueDescriptorProto.options)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int EnumValueDescriptorProto::kNameFieldNumber;
 const int EnumValueDescriptorProto::kNumberFieldNumber;
@@ -6309,21 +6229,28 @@ const int EnumValueDescriptorProto::kOptionsFieldNumber;
 
 EnumValueDescriptorProto::EnumValueDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.EnumValueDescriptorProto)
 }
+EnumValueDescriptorProto::EnumValueDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumValueDescriptorProto)
+}
 EnumValueDescriptorProto::EnumValueDescriptorProto(const EnumValueDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::EnumValueOptions(*from.options_);
@@ -6335,10 +6262,10 @@ EnumValueDescriptorProto::EnumValueDescriptorProto(const EnumValueDescriptorProt
 }
 
 void EnumValueDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&options_, 0, reinterpret_cast<char*>(&number_) -
-    reinterpret_cast<char*>(&options_) + sizeof(number_));
+  ::memset(&options_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&number_) -
+      reinterpret_cast<char*>(&options_)) + sizeof(number_));
 }
 
 EnumValueDescriptorProto::~EnumValueDescriptorProto() {
@@ -6347,45 +6274,45 @@ EnumValueDescriptorProto::~EnumValueDescriptorProto() {
 }
 
 void EnumValueDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void EnumValueDescriptorProto::ArenaDtor(void* object) {
+  EnumValueDescriptorProto* _this = reinterpret_cast< EnumValueDescriptorProto* >(object);
+  (void)_this;
+}
+void EnumValueDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void EnumValueDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* EnumValueDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[8].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const EnumValueDescriptorProto& EnumValueDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueDescriptorProto.base);
   return *internal_default_instance();
 }
 
-EnumValueDescriptorProto* EnumValueDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  EnumValueDescriptorProto* n = new EnumValueDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void EnumValueDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.EnumValueDescriptorProto)
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::EnumValueOptions::Clear();
+      options_->Clear();
     }
   }
   number_ = 0;
@@ -6399,18 +6326,18 @@ bool EnumValueDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.EnumValueDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.EnumValueDescriptorProto.name");
         } else {
@@ -6422,7 +6349,7 @@ bool EnumValueDescriptorProto::MergePartialFromCodedStream(
       // optional int32 number = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_number();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -6436,8 +6363,8 @@ bool EnumValueDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.EnumValueOptions options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -6447,13 +6374,11 @@ bool EnumValueDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -6470,10 +6395,14 @@ failure:
 void EnumValueDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.EnumValueDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.EnumValueDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -6481,31 +6410,35 @@ void EnumValueDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional int32 number = 2;
-  if (has_number()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->number(), output);
   }
 
   // optional .google.protobuf.EnumValueOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, *this->options_, output);
+      3, this->_internal_options(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.EnumValueDescriptorProto)
 }
 
 ::google::protobuf::uint8* EnumValueDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumValueDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.EnumValueDescriptorProto.name");
     target =
@@ -6514,20 +6447,20 @@ void EnumValueDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional int32 number = 2;
-  if (has_number()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->number(), target);
   }
 
   // optional .google.protobuf.EnumValueOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        3, this->_internal_options(), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumValueDescriptorProto)
   return target;
@@ -6540,7 +6473,7 @@ size_t EnumValueDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 7u) {
     // optional string name = 1;
@@ -6553,8 +6486,8 @@ size_t EnumValueDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.EnumValueOptions options = 3;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
     // optional int32 number = 2;
@@ -6566,9 +6499,7 @@ size_t EnumValueDescriptorProto::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -6591,17 +6522,21 @@ void EnumValueDescriptorProto::MergeFrom(const EnumValueDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.EnumValueDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 7u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_options()->::google::protobuf::EnumValueOptions::MergeFrom(from.options());
     }
-    if (from.has_number()) {
-      set_number(from.number());
+    if (cached_has_bits & 0x00000004u) {
+      number_ = from.number_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -6628,160 +6563,58 @@ bool EnumValueDescriptorProto::IsInitialized() const {
 
 void EnumValueDescriptorProto::Swap(EnumValueDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    EnumValueDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void EnumValueDescriptorProto::UnsafeArenaSwap(EnumValueDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void EnumValueDescriptorProto::InternalSwap(EnumValueDescriptorProto* other) {
-  name_.Swap(&other->name_);
-  std::swap(options_, other->options_);
-  std::swap(number_, other->number_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(number_, other->number_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata EnumValueDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[8];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// EnumValueDescriptorProto
 
-// optional string name = 1;
-bool EnumValueDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void EnumValueDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void EnumValueDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void EnumValueDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& EnumValueDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void EnumValueDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumValueDescriptorProto.name)
-}
-#if LANG_CXX11
-void EnumValueDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.EnumValueDescriptorProto.name)
-}
-#endif
-void EnumValueDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.EnumValueDescriptorProto.name)
-}
-void EnumValueDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumValueDescriptorProto.name)
-}
-::std::string* EnumValueDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* EnumValueDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.EnumValueDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void EnumValueDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValueDescriptorProto.name)
-}
-
-// optional int32 number = 2;
-bool EnumValueDescriptorProto::has_number() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void EnumValueDescriptorProto::set_has_number() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void EnumValueDescriptorProto::clear_has_number() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void EnumValueDescriptorProto::clear_number() {
-  number_ = 0;
-  clear_has_number();
-}
-::google::protobuf::int32 EnumValueDescriptorProto::number() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueDescriptorProto.number)
-  return number_;
-}
-void EnumValueDescriptorProto::set_number(::google::protobuf::int32 value) {
-  set_has_number();
-  number_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumValueDescriptorProto.number)
-}
+// ===================================================================
 
-// optional .google.protobuf.EnumValueOptions options = 3;
-bool EnumValueDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void EnumValueDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void EnumValueDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void EnumValueDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::EnumValueOptions::Clear();
-  clear_has_options();
-}
-const ::google::protobuf::EnumValueOptions& EnumValueDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::EnumValueOptions::internal_default_instance();
+void ServiceDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_ServiceDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::ServiceOptions*>(
+      ::google::protobuf::ServiceOptions::internal_default_instance());
 }
-::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::EnumValueOptions;
+void ServiceDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::ServiceOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.EnumValueDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::EnumValueOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void EnumValueDescriptorProto::set_allocated_options(::google::protobuf::EnumValueOptions* options) {
-  delete options_;
   options_ = options;
   if (options) {
     set_has_options();
   } else {
     clear_has_options();
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValueDescriptorProto.options)
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.ServiceDescriptorProto.options)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int ServiceDescriptorProto::kNameFieldNumber;
 const int ServiceDescriptorProto::kMethodFieldNumber;
@@ -6790,22 +6623,30 @@ const int ServiceDescriptorProto::kOptionsFieldNumber;
 
 ServiceDescriptorProto::ServiceDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.ServiceDescriptorProto)
 }
+ServiceDescriptorProto::ServiceDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  method_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.ServiceDescriptorProto)
+}
 ServiceDescriptorProto::ServiceDescriptorProto(const ServiceDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       method_(from.method_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::ServiceOptions(*from.options_);
@@ -6816,7 +6657,6 @@ ServiceDescriptorProto::ServiceDescriptorProto(const ServiceDescriptorProto& fro
 }
 
 void ServiceDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   options_ = NULL;
 }
@@ -6827,46 +6667,46 @@ ServiceDescriptorProto::~ServiceDescriptorProto() {
 }
 
 void ServiceDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void ServiceDescriptorProto::ArenaDtor(void* object) {
+  ServiceDescriptorProto* _this = reinterpret_cast< ServiceDescriptorProto* >(object);
+  (void)_this;
+}
+void ServiceDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void ServiceDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* ServiceDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[9].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const ServiceDescriptorProto& ServiceDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceDescriptorProto.base);
   return *internal_default_instance();
 }
 
-ServiceDescriptorProto* ServiceDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  ServiceDescriptorProto* n = new ServiceDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void ServiceDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.ServiceDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   method_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::ServiceOptions::Clear();
+      options_->Clear();
     }
   }
   _has_bits_.Clear();
@@ -6879,18 +6719,18 @@ bool ServiceDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.ServiceDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.ServiceDescriptorProto.name");
         } else {
@@ -6902,22 +6742,20 @@ bool ServiceDescriptorProto::MergePartialFromCodedStream(
       // repeated .google.protobuf.MethodDescriptorProto method = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_method()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // optional .google.protobuf.ServiceOptions options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -6927,13 +6765,11 @@ bool ServiceDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -6950,10 +6786,14 @@ failure:
 void ServiceDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.ServiceDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.ServiceDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -6961,32 +6801,39 @@ void ServiceDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.MethodDescriptorProto method = 2;
-  for (unsigned int i = 0, n = this->method_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->method_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->method(i), output);
+      2,
+      this->method(static_cast<int>(i)),
+      output);
   }
 
   // optional .google.protobuf.ServiceOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, *this->options_, output);
+      3, this->_internal_options(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.ServiceDescriptorProto)
 }
 
 ::google::protobuf::uint8* ServiceDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.ServiceDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.ServiceDescriptorProto.name");
     target =
@@ -6995,22 +6842,23 @@ void ServiceDescriptorProto::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.MethodDescriptorProto method = 2;
-  for (unsigned int i = 0, n = this->method_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->method_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->method(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->method(static_cast<int>(i)), deterministic, target);
   }
 
   // optional .google.protobuf.ServiceOptions options = 3;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        3, this->_internal_options(), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.ServiceDescriptorProto)
   return target;
@@ -7023,16 +6871,16 @@ size_t ServiceDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.MethodDescriptorProto method = 2;
   {
-    unsigned int count = this->method_size();
+    unsigned int count = static_cast<unsigned int>(this->method_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->method(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->method(static_cast<int>(i)));
     }
   }
 
@@ -7047,15 +6895,13 @@ size_t ServiceDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.ServiceOptions options = 3;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -7078,13 +6924,16 @@ void ServiceDescriptorProto::MergeFrom(const ServiceDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.ServiceDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   method_.MergeFrom(from.method_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000002u) {
       mutable_options()->::google::protobuf::ServiceOptions::MergeFrom(from.options());
     }
   }
@@ -7114,166 +6963,58 @@ bool ServiceDescriptorProto::IsInitialized() const {
 
 void ServiceDescriptorProto::Swap(ServiceDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    ServiceDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void ServiceDescriptorProto::UnsafeArenaSwap(ServiceDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void ServiceDescriptorProto::InternalSwap(ServiceDescriptorProto* other) {
-  method_.UnsafeArenaSwap(&other->method_);
-  name_.Swap(&other->name_);
-  std::swap(options_, other->options_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&method_)->InternalSwap(CastToBase(&other->method_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata ServiceDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[9];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// ServiceDescriptorProto
-
-// optional string name = 1;
-bool ServiceDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void ServiceDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void ServiceDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void ServiceDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& ServiceDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void ServiceDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.ServiceDescriptorProto.name)
-}
-#if LANG_CXX11
-void ServiceDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.ServiceDescriptorProto.name)
-}
-#endif
-void ServiceDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.ServiceDescriptorProto.name)
-}
-void ServiceDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.ServiceDescriptorProto.name)
-}
-::std::string* ServiceDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* ServiceDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.ServiceDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void ServiceDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.ServiceDescriptorProto.name)
-}
 
-// repeated .google.protobuf.MethodDescriptorProto method = 2;
-int ServiceDescriptorProto::method_size() const {
-  return method_.size();
-}
-void ServiceDescriptorProto::clear_method() {
-  method_.Clear();
-}
-const ::google::protobuf::MethodDescriptorProto& ServiceDescriptorProto::method(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.method)
-  return method_.Get(index);
-}
-::google::protobuf::MethodDescriptorProto* ServiceDescriptorProto::mutable_method(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.method)
-  return method_.Mutable(index);
-}
-::google::protobuf::MethodDescriptorProto* ServiceDescriptorProto::add_method() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ServiceDescriptorProto.method)
-  return method_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >*
-ServiceDescriptorProto::mutable_method() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.ServiceDescriptorProto.method)
-  return &method_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >&
-ServiceDescriptorProto::method() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.ServiceDescriptorProto.method)
-  return method_;
-}
+// ===================================================================
 
-// optional .google.protobuf.ServiceOptions options = 3;
-bool ServiceDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void ServiceDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void ServiceDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void ServiceDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::ServiceOptions::Clear();
-  clear_has_options();
-}
-const ::google::protobuf::ServiceOptions& ServiceDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::ServiceOptions::internal_default_instance();
+void MethodDescriptorProto::InitAsDefaultInstance() {
+  ::google::protobuf::_MethodDescriptorProto_default_instance_._instance.get_mutable()->options_ = const_cast< ::google::protobuf::MethodOptions*>(
+      ::google::protobuf::MethodOptions::internal_default_instance());
 }
-::google::protobuf::ServiceOptions* ServiceDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::ServiceOptions;
+void MethodDescriptorProto::unsafe_arena_set_allocated_options(
+    ::google::protobuf::MethodOptions* options) {
+  if (GetArenaNoVirtual() == NULL) {
+    delete options_;
   }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::ServiceOptions* ServiceDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.ServiceDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::ServiceOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void ServiceDescriptorProto::set_allocated_options(::google::protobuf::ServiceOptions* options) {
-  delete options_;
   options_ = options;
   if (options) {
     set_has_options();
   } else {
     clear_has_options();
   }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.ServiceDescriptorProto.options)
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.MethodDescriptorProto.options)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int MethodDescriptorProto::kNameFieldNumber;
 const int MethodDescriptorProto::kInputTypeFieldNumber;
@@ -7285,29 +7026,38 @@ const int MethodDescriptorProto::kServerStreamingFieldNumber;
 
 MethodDescriptorProto::MethodDescriptorProto()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodDescriptorProto.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.MethodDescriptorProto)
 }
+MethodDescriptorProto::MethodDescriptorProto(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodDescriptorProto.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.MethodDescriptorProto)
+}
 MethodDescriptorProto::MethodDescriptorProto(const MethodDescriptorProto& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name()) {
-    name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+    name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name(),
+      GetArenaNoVirtual());
   }
   input_type_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_input_type()) {
-    input_type_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.input_type_);
+    input_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.input_type(),
+      GetArenaNoVirtual());
   }
   output_type_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_output_type()) {
-    output_type_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.output_type_);
+    output_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.output_type(),
+      GetArenaNoVirtual());
   }
   if (from.has_options()) {
     options_ = new ::google::protobuf::MethodOptions(*from.options_);
@@ -7315,18 +7065,18 @@ MethodDescriptorProto::MethodDescriptorProto(const MethodDescriptorProto& from)
     options_ = NULL;
   }
   ::memcpy(&client_streaming_, &from.client_streaming_,
-    reinterpret_cast<char*>(&server_streaming_) -
-    reinterpret_cast<char*>(&client_streaming_) + sizeof(server_streaming_));
+    static_cast<size_t>(reinterpret_cast<char*>(&server_streaming_) -
+    reinterpret_cast<char*>(&client_streaming_)) + sizeof(server_streaming_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.MethodDescriptorProto)
 }
 
 void MethodDescriptorProto::SharedCtor() {
-  _cached_size_ = 0;
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   input_type_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   output_type_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&options_, 0, reinterpret_cast<char*>(&server_streaming_) -
-    reinterpret_cast<char*>(&options_) + sizeof(server_streaming_));
+  ::memset(&options_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&server_streaming_) -
+      reinterpret_cast<char*>(&options_)) + sizeof(server_streaming_));
 }
 
 MethodDescriptorProto::~MethodDescriptorProto() {
@@ -7335,61 +7085,58 @@ MethodDescriptorProto::~MethodDescriptorProto() {
 }
 
 void MethodDescriptorProto::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   input_type_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   output_type_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  if (this != internal_default_instance()) {
-    delete options_;
-  }
+  if (this != internal_default_instance()) delete options_;
 }
 
+void MethodDescriptorProto::ArenaDtor(void* object) {
+  MethodDescriptorProto* _this = reinterpret_cast< MethodDescriptorProto* >(object);
+  (void)_this;
+}
+void MethodDescriptorProto::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void MethodDescriptorProto::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* MethodDescriptorProto::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[10].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const MethodDescriptorProto& MethodDescriptorProto::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodDescriptorProto.base);
   return *internal_default_instance();
 }
 
-MethodDescriptorProto* MethodDescriptorProto::New(::google::protobuf::Arena* arena) const {
-  MethodDescriptorProto* n = new MethodDescriptorProto;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void MethodDescriptorProto::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.MethodDescriptorProto)
-  if (_has_bits_[0 / 32] & 15u) {
-    if (has_name()) {
-      GOOGLE_DCHECK(!name_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*name_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 15u) {
+    if (cached_has_bits & 0x00000001u) {
+      name_.ClearNonDefaultToEmpty();
     }
-    if (has_input_type()) {
-      GOOGLE_DCHECK(!input_type_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*input_type_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      input_type_.ClearNonDefaultToEmpty();
     }
-    if (has_output_type()) {
-      GOOGLE_DCHECK(!output_type_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*output_type_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      output_type_.ClearNonDefaultToEmpty();
     }
-    if (has_options()) {
+    if (cached_has_bits & 0x00000008u) {
       GOOGLE_DCHECK(options_ != NULL);
-      options_->::google::protobuf::MethodOptions::Clear();
+      options_->Clear();
     }
   }
-  if (_has_bits_[0 / 32] & 48u) {
-    ::memset(&client_streaming_, 0, reinterpret_cast<char*>(&server_streaming_) -
-      reinterpret_cast<char*>(&client_streaming_) + sizeof(server_streaming_));
-  }
+  ::memset(&client_streaming_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&server_streaming_) -
+      reinterpret_cast<char*>(&client_streaming_)) + sizeof(server_streaming_));
   _has_bits_.Clear();
   _internal_metadata_.Clear();
 }
@@ -7400,18 +7147,18 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.MethodDescriptorProto)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.MethodDescriptorProto.name");
         } else {
@@ -7423,11 +7170,11 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
       // optional string input_type = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_input_type()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->input_type().data(), this->input_type().length(),
+            this->input_type().data(), static_cast<int>(this->input_type().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.MethodDescriptorProto.input_type");
         } else {
@@ -7439,11 +7186,11 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
       // optional string output_type = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_output_type()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->output_type().data(), this->output_type().length(),
+            this->output_type().data(), static_cast<int>(this->output_type().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.MethodDescriptorProto.output_type");
         } else {
@@ -7455,8 +7202,8 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
       // optional .google.protobuf.MethodOptions options = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_options()));
         } else {
           goto handle_unusual;
@@ -7467,7 +7214,7 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
       // optional bool client_streaming = 5 [default = false];
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
           set_has_client_streaming();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -7481,7 +7228,7 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
       // optional bool server_streaming = 6 [default = false];
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(48u)) {
+            static_cast< ::google::protobuf::uint8>(48u /* 48 & 0xFF */)) {
           set_has_server_streaming();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -7494,13 +7241,11 @@ bool MethodDescriptorProto::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -7517,10 +7262,14 @@ failure:
 void MethodDescriptorProto::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.MethodDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -7528,9 +7277,9 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string input_type = 2;
-  if (has_input_type()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->input_type().data(), this->input_type().length(),
+      this->input_type().data(), static_cast<int>(this->input_type().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.input_type");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -7538,9 +7287,9 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string output_type = 3;
-  if (has_output_type()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->output_type().data(), this->output_type().length(),
+      this->output_type().data(), static_cast<int>(this->output_type().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.output_type");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -7548,36 +7297,40 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.MethodOptions options = 4;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      4, *this->options_, output);
+      4, this->_internal_options(), output);
   }
 
   // optional bool client_streaming = 5 [default = false];
-  if (has_client_streaming()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(5, this->client_streaming(), output);
   }
 
   // optional bool server_streaming = 6 [default = false];
-  if (has_server_streaming()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(6, this->server_streaming(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.MethodDescriptorProto)
 }
 
 ::google::protobuf::uint8* MethodDescriptorProto::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.MethodDescriptorProto)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string name = 1;
-  if (has_name()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.name");
     target =
@@ -7586,9 +7339,9 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string input_type = 2;
-  if (has_input_type()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->input_type().data(), this->input_type().length(),
+      this->input_type().data(), static_cast<int>(this->input_type().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.input_type");
     target =
@@ -7597,9 +7350,9 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional string output_type = 3;
-  if (has_output_type()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->output_type().data(), this->output_type().length(),
+      this->output_type().data(), static_cast<int>(this->output_type().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.MethodDescriptorProto.output_type");
     target =
@@ -7608,25 +7361,25 @@ void MethodDescriptorProto::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.MethodOptions options = 4;
-  if (has_options()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        4, *this->options_, false, target);
+      InternalWriteMessageToArray(
+        4, this->_internal_options(), deterministic, target);
   }
 
   // optional bool client_streaming = 5 [default = false];
-  if (has_client_streaming()) {
+  if (cached_has_bits & 0x00000010u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(5, this->client_streaming(), target);
   }
 
   // optional bool server_streaming = 6 [default = false];
-  if (has_server_streaming()) {
+  if (cached_has_bits & 0x00000020u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(6, this->server_streaming(), target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.MethodDescriptorProto)
   return target;
@@ -7639,7 +7392,7 @@ size_t MethodDescriptorProto::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (_has_bits_[0 / 32] & 63u) {
     // optional string name = 1;
@@ -7666,8 +7419,8 @@ size_t MethodDescriptorProto::ByteSizeLong() const {
     // optional .google.protobuf.MethodOptions options = 4;
     if (has_options()) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          *this->options_);
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          *options_);
     }
 
     // optional bool client_streaming = 5 [default = false];
@@ -7682,9 +7435,7 @@ size_t MethodDescriptorProto::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -7707,28 +7458,30 @@ void MethodDescriptorProto::MergeFrom(const MethodDescriptorProto& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.MethodDescriptorProto)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 63u) {
-    if (from.has_name()) {
-      set_has_name();
-      name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 63u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name(from.name());
     }
-    if (from.has_input_type()) {
-      set_has_input_type();
-      input_type_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.input_type_);
+    if (cached_has_bits & 0x00000002u) {
+      set_input_type(from.input_type());
     }
-    if (from.has_output_type()) {
-      set_has_output_type();
-      output_type_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.output_type_);
+    if (cached_has_bits & 0x00000004u) {
+      set_output_type(from.output_type());
     }
-    if (from.has_options()) {
+    if (cached_has_bits & 0x00000008u) {
       mutable_options()->::google::protobuf::MethodOptions::MergeFrom(from.options());
     }
-    if (from.has_client_streaming()) {
-      set_client_streaming(from.client_streaming());
+    if (cached_has_bits & 0x00000010u) {
+      client_streaming_ = from.client_streaming_;
     }
-    if (from.has_server_streaming()) {
-      set_server_streaming(from.server_streaming());
+    if (cached_has_bits & 0x00000020u) {
+      server_streaming_ = from.server_streaming_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -7755,311 +7508,48 @@ bool MethodDescriptorProto::IsInitialized() const {
 
 void MethodDescriptorProto::Swap(MethodDescriptorProto* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    MethodDescriptorProto* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void MethodDescriptorProto::UnsafeArenaSwap(MethodDescriptorProto* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void MethodDescriptorProto::InternalSwap(MethodDescriptorProto* other) {
-  name_.Swap(&other->name_);
-  input_type_.Swap(&other->input_type_);
-  output_type_.Swap(&other->output_type_);
-  std::swap(options_, other->options_);
-  std::swap(client_streaming_, other->client_streaming_);
-  std::swap(server_streaming_, other->server_streaming_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  input_type_.Swap(&other->input_type_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  output_type_.Swap(&other->output_type_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(options_, other->options_);
+  swap(client_streaming_, other->client_streaming_);
+  swap(server_streaming_, other->server_streaming_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata MethodDescriptorProto::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[10];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// MethodDescriptorProto
-
-// optional string name = 1;
-bool MethodDescriptorProto::has_name() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void MethodDescriptorProto::set_has_name() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void MethodDescriptorProto::clear_has_name() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void MethodDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name();
-}
-const ::std::string& MethodDescriptorProto::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.name)
-  return name_.GetNoArena();
-}
-void MethodDescriptorProto::set_name(const ::std::string& value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.name)
-}
-#if LANG_CXX11
-void MethodDescriptorProto::set_name(::std::string&& value) {
-  set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.name)
-}
-#endif
-void MethodDescriptorProto::set_name(const char* value) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.name)
-}
-void MethodDescriptorProto::set_name(const char* value, size_t size) {
-  set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.name)
-}
-::std::string* MethodDescriptorProto::mutable_name() {
-  set_has_name();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* MethodDescriptorProto::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.name)
-  clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void MethodDescriptorProto::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    set_has_name();
-  } else {
-    clear_has_name();
-  }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.name)
-}
-
-// optional string input_type = 2;
-bool MethodDescriptorProto::has_input_type() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void MethodDescriptorProto::set_has_input_type() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void MethodDescriptorProto::clear_has_input_type() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void MethodDescriptorProto::clear_input_type() {
-  input_type_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_input_type();
-}
-const ::std::string& MethodDescriptorProto::input_type() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.input_type)
-  return input_type_.GetNoArena();
-}
-void MethodDescriptorProto::set_input_type(const ::std::string& value) {
-  set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.input_type)
-}
-#if LANG_CXX11
-void MethodDescriptorProto::set_input_type(::std::string&& value) {
-  set_has_input_type();
-  input_type_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.input_type)
-}
-#endif
-void MethodDescriptorProto::set_input_type(const char* value) {
-  set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.input_type)
-}
-void MethodDescriptorProto::set_input_type(const char* value, size_t size) {
-  set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.input_type)
-}
-::std::string* MethodDescriptorProto::mutable_input_type() {
-  set_has_input_type();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.input_type)
-  return input_type_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* MethodDescriptorProto::release_input_type() {
-  // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.input_type)
-  clear_has_input_type();
-  return input_type_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void MethodDescriptorProto::set_allocated_input_type(::std::string* input_type) {
-  if (input_type != NULL) {
-    set_has_input_type();
-  } else {
-    clear_has_input_type();
-  }
-  input_type_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), input_type);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.input_type)
-}
-
-// optional string output_type = 3;
-bool MethodDescriptorProto::has_output_type() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void MethodDescriptorProto::set_has_output_type() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void MethodDescriptorProto::clear_has_output_type() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void MethodDescriptorProto::clear_output_type() {
-  output_type_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_output_type();
-}
-const ::std::string& MethodDescriptorProto::output_type() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.output_type)
-  return output_type_.GetNoArena();
-}
-void MethodDescriptorProto::set_output_type(const ::std::string& value) {
-  set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.output_type)
-}
-#if LANG_CXX11
-void MethodDescriptorProto::set_output_type(::std::string&& value) {
-  set_has_output_type();
-  output_type_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.output_type)
-}
-#endif
-void MethodDescriptorProto::set_output_type(const char* value) {
-  set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.output_type)
-}
-void MethodDescriptorProto::set_output_type(const char* value, size_t size) {
-  set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.output_type)
-}
-::std::string* MethodDescriptorProto::mutable_output_type() {
-  set_has_output_type();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.output_type)
-  return output_type_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* MethodDescriptorProto::release_output_type() {
-  // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.output_type)
-  clear_has_output_type();
-  return output_type_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void MethodDescriptorProto::set_allocated_output_type(::std::string* output_type) {
-  if (output_type != NULL) {
-    set_has_output_type();
-  } else {
-    clear_has_output_type();
-  }
-  output_type_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), output_type);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.output_type)
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// optional .google.protobuf.MethodOptions options = 4;
-bool MethodDescriptorProto::has_options() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void MethodDescriptorProto::set_has_options() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void MethodDescriptorProto::clear_has_options() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void MethodDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::MethodOptions::Clear();
-  clear_has_options();
-}
-const ::google::protobuf::MethodOptions& MethodDescriptorProto::options() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::MethodOptions::internal_default_instance();
-}
-::google::protobuf::MethodOptions* MethodDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::MethodOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.options)
-  return options_;
-}
-::google::protobuf::MethodOptions* MethodDescriptorProto::release_options() {
-  // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.options)
-  clear_has_options();
-  ::google::protobuf::MethodOptions* temp = options_;
-  options_ = NULL;
-  return temp;
-}
-void MethodDescriptorProto::set_allocated_options(::google::protobuf::MethodOptions* options) {
-  delete options_;
-  options_ = options;
-  if (options) {
-    set_has_options();
-  } else {
-    clear_has_options();
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.options)
-}
-
-// optional bool client_streaming = 5 [default = false];
-bool MethodDescriptorProto::has_client_streaming() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void MethodDescriptorProto::set_has_client_streaming() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void MethodDescriptorProto::clear_has_client_streaming() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void MethodDescriptorProto::clear_client_streaming() {
-  client_streaming_ = false;
-  clear_has_client_streaming();
-}
-bool MethodDescriptorProto::client_streaming() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.client_streaming)
-  return client_streaming_;
-}
-void MethodDescriptorProto::set_client_streaming(bool value) {
-  set_has_client_streaming();
-  client_streaming_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.client_streaming)
-}
-
-// optional bool server_streaming = 6 [default = false];
-bool MethodDescriptorProto::has_server_streaming() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
-}
-void MethodDescriptorProto::set_has_server_streaming() {
-  _has_bits_[0] |= 0x00000020u;
-}
-void MethodDescriptorProto::clear_has_server_streaming() {
-  _has_bits_[0] &= ~0x00000020u;
-}
-void MethodDescriptorProto::clear_server_streaming() {
-  server_streaming_ = false;
-  clear_has_server_streaming();
-}
-bool MethodDescriptorProto::server_streaming() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.server_streaming)
-  return server_streaming_;
-}
-void MethodDescriptorProto::set_server_streaming(bool value) {
-  set_has_server_streaming();
-  server_streaming_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.server_streaming)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void FileOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FileOptions::kJavaPackageFieldNumber;
 const int FileOptions::kJavaOuterClassnameFieldNumber;
@@ -8071,70 +7561,113 @@ const int FileOptions::kGoPackageFieldNumber;
 const int FileOptions::kCcGenericServicesFieldNumber;
 const int FileOptions::kJavaGenericServicesFieldNumber;
 const int FileOptions::kPyGenericServicesFieldNumber;
+const int FileOptions::kPhpGenericServicesFieldNumber;
 const int FileOptions::kDeprecatedFieldNumber;
 const int FileOptions::kCcEnableArenasFieldNumber;
 const int FileOptions::kObjcClassPrefixFieldNumber;
 const int FileOptions::kCsharpNamespaceFieldNumber;
 const int FileOptions::kSwiftPrefixFieldNumber;
+const int FileOptions::kPhpClassPrefixFieldNumber;
+const int FileOptions::kPhpNamespaceFieldNumber;
+const int FileOptions::kPhpMetadataNamespaceFieldNumber;
+const int FileOptions::kRubyPackageFieldNumber;
 const int FileOptions::kUninterpretedOptionFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 FileOptions::FileOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FileOptions)
 }
+FileOptions::FileOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.FileOptions)
+}
 FileOptions::FileOptions(const FileOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
   java_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_java_package()) {
-    java_package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_package_);
+    java_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_package(),
+      GetArenaNoVirtual());
   }
   java_outer_classname_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_java_outer_classname()) {
-    java_outer_classname_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_outer_classname_);
+    java_outer_classname_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_outer_classname(),
+      GetArenaNoVirtual());
   }
   go_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_go_package()) {
-    go_package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.go_package_);
+    go_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.go_package(),
+      GetArenaNoVirtual());
   }
   objc_class_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_objc_class_prefix()) {
-    objc_class_prefix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.objc_class_prefix_);
+    objc_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.objc_class_prefix(),
+      GetArenaNoVirtual());
   }
   csharp_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_csharp_namespace()) {
-    csharp_namespace_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.csharp_namespace_);
+    csharp_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.csharp_namespace(),
+      GetArenaNoVirtual());
   }
   swift_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_swift_prefix()) {
-    swift_prefix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.swift_prefix_);
+    swift_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.swift_prefix(),
+      GetArenaNoVirtual());
+  }
+  php_class_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (from.has_php_class_prefix()) {
+    php_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.php_class_prefix(),
+      GetArenaNoVirtual());
+  }
+  php_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (from.has_php_namespace()) {
+    php_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.php_namespace(),
+      GetArenaNoVirtual());
+  }
+  php_metadata_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (from.has_php_metadata_namespace()) {
+    php_metadata_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.php_metadata_namespace(),
+      GetArenaNoVirtual());
+  }
+  ruby_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (from.has_ruby_package()) {
+    ruby_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.ruby_package(),
+      GetArenaNoVirtual());
   }
   ::memcpy(&java_multiple_files_, &from.java_multiple_files_,
-    reinterpret_cast<char*>(&optimize_for_) -
-    reinterpret_cast<char*>(&java_multiple_files_) + sizeof(optimize_for_));
+    static_cast<size_t>(reinterpret_cast<char*>(&optimize_for_) -
+    reinterpret_cast<char*>(&java_multiple_files_)) + sizeof(optimize_for_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FileOptions)
 }
 
 void FileOptions::SharedCtor() {
-  _cached_size_ = 0;
   java_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   java_outer_classname_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   go_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   objc_class_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   csharp_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   swift_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&java_multiple_files_, 0, reinterpret_cast<char*>(&cc_enable_arenas_) -
-    reinterpret_cast<char*>(&java_multiple_files_) + sizeof(cc_enable_arenas_));
+  php_class_prefix_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  php_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  php_metadata_namespace_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  ruby_package_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  ::memset(&java_multiple_files_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&cc_enable_arenas_) -
+      reinterpret_cast<char*>(&java_multiple_files_)) + sizeof(cc_enable_arenas_));
   optimize_for_ = 1;
 }
 
@@ -8144,74 +7677,91 @@ FileOptions::~FileOptions() {
 }
 
 void FileOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   java_package_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   java_outer_classname_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   go_package_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   objc_class_prefix_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   csharp_namespace_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   swift_prefix_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  php_class_prefix_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  php_namespace_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  php_metadata_namespace_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  ruby_package_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
+void FileOptions::ArenaDtor(void* object) {
+  FileOptions* _this = reinterpret_cast< FileOptions* >(object);
+  (void)_this;
+}
+void FileOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void FileOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FileOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[11].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FileOptions& FileOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FileOptions.base);
   return *internal_default_instance();
 }
 
-FileOptions* FileOptions::New(::google::protobuf::Arena* arena) const {
-  FileOptions* n = new FileOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FileOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FileOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
-  if (_has_bits_[0 / 32] & 63u) {
-    if (has_java_package()) {
-      GOOGLE_DCHECK(!java_package_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*java_package_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 255u) {
+    if (cached_has_bits & 0x00000001u) {
+      java_package_.ClearNonDefaultToEmpty();
     }
-    if (has_java_outer_classname()) {
-      GOOGLE_DCHECK(!java_outer_classname_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*java_outer_classname_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      java_outer_classname_.ClearNonDefaultToEmpty();
     }
-    if (has_go_package()) {
-      GOOGLE_DCHECK(!go_package_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*go_package_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      go_package_.ClearNonDefaultToEmpty();
     }
-    if (has_objc_class_prefix()) {
-      GOOGLE_DCHECK(!objc_class_prefix_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*objc_class_prefix_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000008u) {
+      objc_class_prefix_.ClearNonDefaultToEmpty();
     }
-    if (has_csharp_namespace()) {
-      GOOGLE_DCHECK(!csharp_namespace_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*csharp_namespace_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000010u) {
+      csharp_namespace_.ClearNonDefaultToEmpty();
     }
-    if (has_swift_prefix()) {
-      GOOGLE_DCHECK(!swift_prefix_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*swift_prefix_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000020u) {
+      swift_prefix_.ClearNonDefaultToEmpty();
+    }
+    if (cached_has_bits & 0x00000040u) {
+      php_class_prefix_.ClearNonDefaultToEmpty();
+    }
+    if (cached_has_bits & 0x00000080u) {
+      php_namespace_.ClearNonDefaultToEmpty();
     }
   }
-  if (_has_bits_[0 / 32] & 192u) {
-    ::memset(&java_multiple_files_, 0, reinterpret_cast<char*>(&java_generate_equals_and_hash_) -
-      reinterpret_cast<char*>(&java_multiple_files_) + sizeof(java_generate_equals_and_hash_));
+  if (cached_has_bits & 768u) {
+    if (cached_has_bits & 0x00000100u) {
+      php_metadata_namespace_.ClearNonDefaultToEmpty();
+    }
+    if (cached_has_bits & 0x00000200u) {
+      ruby_package_.ClearNonDefaultToEmpty();
+    }
+  }
+  if (cached_has_bits & 64512u) {
+    ::memset(&java_multiple_files_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&py_generic_services_) -
+        reinterpret_cast<char*>(&java_multiple_files_)) + sizeof(py_generic_services_));
   }
-  if (_has_bits_[8 / 32] & 32512u) {
-    ::memset(&java_string_check_utf8_, 0, reinterpret_cast<char*>(&cc_enable_arenas_) -
-      reinterpret_cast<char*>(&java_string_check_utf8_) + sizeof(cc_enable_arenas_));
+  if (cached_has_bits & 983040u) {
+    ::memset(&php_generic_services_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&cc_enable_arenas_) -
+        reinterpret_cast<char*>(&php_generic_services_)) + sizeof(cc_enable_arenas_));
     optimize_for_ = 1;
   }
   _has_bits_.Clear();
@@ -8224,18 +7774,18 @@ bool FileOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FileOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional string java_package = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_java_package()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->java_package().data(), this->java_package().length(),
+            this->java_package().data(), static_cast<int>(this->java_package().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.java_package");
         } else {
@@ -8247,11 +7797,11 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional string java_outer_classname = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(66u)) {
+            static_cast< ::google::protobuf::uint8>(66u /* 66 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_java_outer_classname()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->java_outer_classname().data(), this->java_outer_classname().length(),
+            this->java_outer_classname().data(), static_cast<int>(this->java_outer_classname().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.java_outer_classname");
         } else {
@@ -8263,7 +7813,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];
       case 9: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(72u)) {
+            static_cast< ::google::protobuf::uint8>(72u /* 72 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -8271,7 +7821,8 @@ bool FileOptions::MergePartialFromCodedStream(
           if (::google::protobuf::FileOptions_OptimizeMode_IsValid(value)) {
             set_optimize_for(static_cast< ::google::protobuf::FileOptions_OptimizeMode >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(9, value);
+            mutable_unknown_fields()->AddVarint(
+                9, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -8282,7 +7833,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool java_multiple_files = 10 [default = false];
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(80u)) {
+            static_cast< ::google::protobuf::uint8>(80u /* 80 & 0xFF */)) {
           set_has_java_multiple_files();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8296,11 +7847,11 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional string go_package = 11;
       case 11: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(90u)) {
+            static_cast< ::google::protobuf::uint8>(90u /* 90 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_go_package()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->go_package().data(), this->go_package().length(),
+            this->go_package().data(), static_cast<int>(this->go_package().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.go_package");
         } else {
@@ -8312,7 +7863,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool cc_generic_services = 16 [default = false];
       case 16: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(128u)) {
+            static_cast< ::google::protobuf::uint8>(128u /* 128 & 0xFF */)) {
           set_has_cc_generic_services();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8326,7 +7877,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool java_generic_services = 17 [default = false];
       case 17: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(136u)) {
+            static_cast< ::google::protobuf::uint8>(136u /* 136 & 0xFF */)) {
           set_has_java_generic_services();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8340,7 +7891,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool py_generic_services = 18 [default = false];
       case 18: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(144u)) {
+            static_cast< ::google::protobuf::uint8>(144u /* 144 & 0xFF */)) {
           set_has_py_generic_services();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8354,7 +7905,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool java_generate_equals_and_hash = 20 [deprecated = true];
       case 20: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(160u)) {
+            static_cast< ::google::protobuf::uint8>(160u /* 160 & 0xFF */)) {
           set_has_java_generate_equals_and_hash();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8368,7 +7919,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool deprecated = 23 [default = false];
       case 23: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(184u)) {
+            static_cast< ::google::protobuf::uint8>(184u /* 184 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8382,7 +7933,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool java_string_check_utf8 = 27 [default = false];
       case 27: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(216u)) {
+            static_cast< ::google::protobuf::uint8>(216u /* 216 & 0xFF */)) {
           set_has_java_string_check_utf8();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8396,7 +7947,7 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional bool cc_enable_arenas = 31 [default = false];
       case 31: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(248u)) {
+            static_cast< ::google::protobuf::uint8>(248u /* 248 & 0xFF */)) {
           set_has_cc_enable_arenas();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -8410,11 +7961,11 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional string objc_class_prefix = 36;
       case 36: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(290u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 290 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_objc_class_prefix()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->objc_class_prefix().data(), this->objc_class_prefix().length(),
+            this->objc_class_prefix().data(), static_cast<int>(this->objc_class_prefix().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.objc_class_prefix");
         } else {
@@ -8426,11 +7977,11 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional string csharp_namespace = 37;
       case 37: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(298u)) {
+            static_cast< ::google::protobuf::uint8>(42u /* 298 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_csharp_namespace()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->csharp_namespace().data(), this->csharp_namespace().length(),
+            this->csharp_namespace().data(), static_cast<int>(this->csharp_namespace().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.csharp_namespace");
         } else {
@@ -8442,11 +7993,11 @@ bool FileOptions::MergePartialFromCodedStream(
       // optional string swift_prefix = 39;
       case 39: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(314u)) {
+            static_cast< ::google::protobuf::uint8>(58u /* 314 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_swift_prefix()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->swift_prefix().data(), this->swift_prefix().length(),
+            this->swift_prefix().data(), static_cast<int>(this->swift_prefix().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.FileOptions.swift_prefix");
         } else {
@@ -8455,34 +8006,109 @@ bool FileOptions::MergePartialFromCodedStream(
         break;
       }
 
+      // optional string php_class_prefix = 40;
+      case 40: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(66u /* 322 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadString(
+                input, this->mutable_php_class_prefix()));
+          ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+            this->php_class_prefix().data(), static_cast<int>(this->php_class_prefix().length()),
+            ::google::protobuf::internal::WireFormat::PARSE,
+            "google.protobuf.FileOptions.php_class_prefix");
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // optional string php_namespace = 41;
+      case 41: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(74u /* 330 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadString(
+                input, this->mutable_php_namespace()));
+          ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+            this->php_namespace().data(), static_cast<int>(this->php_namespace().length()),
+            ::google::protobuf::internal::WireFormat::PARSE,
+            "google.protobuf.FileOptions.php_namespace");
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // optional bool php_generic_services = 42 [default = false];
+      case 42: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(80u /* 336 & 0xFF */)) {
+          set_has_php_generic_services();
+          DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                   bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
+                 input, &php_generic_services_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // optional string php_metadata_namespace = 44;
+      case 44: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(98u /* 354 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadString(
+                input, this->mutable_php_metadata_namespace()));
+          ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+            this->php_metadata_namespace().data(), static_cast<int>(this->php_metadata_namespace().length()),
+            ::google::protobuf::internal::WireFormat::PARSE,
+            "google.protobuf.FileOptions.php_metadata_namespace");
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
+      // optional string ruby_package = 45;
+      case 45: {
+        if (static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(106u /* 362 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadString(
+                input, this->mutable_ruby_package()));
+          ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+            this->ruby_package().data(), static_cast<int>(this->ruby_package().length()),
+            ::google::protobuf::internal::WireFormat::PARSE,
+            "google.protobuf.FileOptions.ruby_package");
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -8499,10 +8125,14 @@ failure:
 void FileOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FileOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string java_package = 1;
-  if (has_java_package()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->java_package().data(), this->java_package().length(),
+      this->java_package().data(), static_cast<int>(this->java_package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.java_package");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -8510,9 +8140,9 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string java_outer_classname = 8;
-  if (has_java_outer_classname()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->java_outer_classname().data(), this->java_outer_classname().length(),
+      this->java_outer_classname().data(), static_cast<int>(this->java_outer_classname().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.java_outer_classname");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -8520,20 +8150,20 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];
-  if (has_optimize_for()) {
+  if (cached_has_bits & 0x00080000u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       9, this->optimize_for(), output);
   }
 
   // optional bool java_multiple_files = 10 [default = false];
-  if (has_java_multiple_files()) {
+  if (cached_has_bits & 0x00000400u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(10, this->java_multiple_files(), output);
   }
 
   // optional string go_package = 11;
-  if (has_go_package()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->go_package().data(), this->go_package().length(),
+      this->go_package().data(), static_cast<int>(this->go_package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.go_package");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -8541,44 +8171,44 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional bool cc_generic_services = 16 [default = false];
-  if (has_cc_generic_services()) {
+  if (cached_has_bits & 0x00002000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(16, this->cc_generic_services(), output);
   }
 
   // optional bool java_generic_services = 17 [default = false];
-  if (has_java_generic_services()) {
+  if (cached_has_bits & 0x00004000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(17, this->java_generic_services(), output);
   }
 
   // optional bool py_generic_services = 18 [default = false];
-  if (has_py_generic_services()) {
+  if (cached_has_bits & 0x00008000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(18, this->py_generic_services(), output);
   }
 
   // optional bool java_generate_equals_and_hash = 20 [deprecated = true];
-  if (has_java_generate_equals_and_hash()) {
+  if (cached_has_bits & 0x00000800u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(20, this->java_generate_equals_and_hash(), output);
   }
 
   // optional bool deprecated = 23 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00020000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(23, this->deprecated(), output);
   }
 
   // optional bool java_string_check_utf8 = 27 [default = false];
-  if (has_java_string_check_utf8()) {
+  if (cached_has_bits & 0x00001000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(27, this->java_string_check_utf8(), output);
   }
 
   // optional bool cc_enable_arenas = 31 [default = false];
-  if (has_cc_enable_arenas()) {
+  if (cached_has_bits & 0x00040000u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(31, this->cc_enable_arenas(), output);
   }
 
   // optional string objc_class_prefix = 36;
-  if (has_objc_class_prefix()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->objc_class_prefix().data(), this->objc_class_prefix().length(),
+      this->objc_class_prefix().data(), static_cast<int>(this->objc_class_prefix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.objc_class_prefix");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -8586,9 +8216,9 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string csharp_namespace = 37;
-  if (has_csharp_namespace()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->csharp_namespace().data(), this->csharp_namespace().length(),
+      this->csharp_namespace().data(), static_cast<int>(this->csharp_namespace().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.csharp_namespace");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -8596,19 +8226,67 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string swift_prefix = 39;
-  if (has_swift_prefix()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->swift_prefix().data(), this->swift_prefix().length(),
+      this->swift_prefix().data(), static_cast<int>(this->swift_prefix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.swift_prefix");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
       39, this->swift_prefix(), output);
   }
 
+  // optional string php_class_prefix = 40;
+  if (cached_has_bits & 0x00000040u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_class_prefix().data(), static_cast<int>(this->php_class_prefix().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_class_prefix");
+    ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
+      40, this->php_class_prefix(), output);
+  }
+
+  // optional string php_namespace = 41;
+  if (cached_has_bits & 0x00000080u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_namespace().data(), static_cast<int>(this->php_namespace().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_namespace");
+    ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
+      41, this->php_namespace(), output);
+  }
+
+  // optional bool php_generic_services = 42 [default = false];
+  if (cached_has_bits & 0x00010000u) {
+    ::google::protobuf::internal::WireFormatLite::WriteBool(42, this->php_generic_services(), output);
+  }
+
+  // optional string php_metadata_namespace = 44;
+  if (cached_has_bits & 0x00000100u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_metadata_namespace().data(), static_cast<int>(this->php_metadata_namespace().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_metadata_namespace");
+    ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
+      44, this->php_metadata_namespace(), output);
+  }
+
+  // optional string ruby_package = 45;
+  if (cached_has_bits & 0x00000200u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->ruby_package().data(), static_cast<int>(this->ruby_package().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.ruby_package");
+    ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
+      45, this->ruby_package(), output);
+  }
+
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -8617,19 +8295,23 @@ void FileOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FileOptions)
 }
 
 ::google::protobuf::uint8* FileOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FileOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional string java_package = 1;
-  if (has_java_package()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->java_package().data(), this->java_package().length(),
+      this->java_package().data(), static_cast<int>(this->java_package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.java_package");
     target =
@@ -8638,9 +8320,9 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string java_outer_classname = 8;
-  if (has_java_outer_classname()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->java_outer_classname().data(), this->java_outer_classname().length(),
+      this->java_outer_classname().data(), static_cast<int>(this->java_outer_classname().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.java_outer_classname");
     target =
@@ -8649,20 +8331,20 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];
-  if (has_optimize_for()) {
+  if (cached_has_bits & 0x00080000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       9, this->optimize_for(), target);
   }
 
   // optional bool java_multiple_files = 10 [default = false];
-  if (has_java_multiple_files()) {
+  if (cached_has_bits & 0x00000400u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(10, this->java_multiple_files(), target);
   }
 
   // optional string go_package = 11;
-  if (has_go_package()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->go_package().data(), this->go_package().length(),
+      this->go_package().data(), static_cast<int>(this->go_package().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.go_package");
     target =
@@ -8671,44 +8353,44 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional bool cc_generic_services = 16 [default = false];
-  if (has_cc_generic_services()) {
+  if (cached_has_bits & 0x00002000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(16, this->cc_generic_services(), target);
   }
 
   // optional bool java_generic_services = 17 [default = false];
-  if (has_java_generic_services()) {
+  if (cached_has_bits & 0x00004000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(17, this->java_generic_services(), target);
   }
 
   // optional bool py_generic_services = 18 [default = false];
-  if (has_py_generic_services()) {
+  if (cached_has_bits & 0x00008000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(18, this->py_generic_services(), target);
   }
 
   // optional bool java_generate_equals_and_hash = 20 [deprecated = true];
-  if (has_java_generate_equals_and_hash()) {
+  if (cached_has_bits & 0x00000800u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(20, this->java_generate_equals_and_hash(), target);
   }
 
   // optional bool deprecated = 23 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00020000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(23, this->deprecated(), target);
   }
 
   // optional bool java_string_check_utf8 = 27 [default = false];
-  if (has_java_string_check_utf8()) {
+  if (cached_has_bits & 0x00001000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(27, this->java_string_check_utf8(), target);
   }
 
   // optional bool cc_enable_arenas = 31 [default = false];
-  if (has_cc_enable_arenas()) {
+  if (cached_has_bits & 0x00040000u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(31, this->cc_enable_arenas(), target);
   }
 
   // optional string objc_class_prefix = 36;
-  if (has_objc_class_prefix()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->objc_class_prefix().data(), this->objc_class_prefix().length(),
+      this->objc_class_prefix().data(), static_cast<int>(this->objc_class_prefix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.objc_class_prefix");
     target =
@@ -8717,9 +8399,9 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string csharp_namespace = 37;
-  if (has_csharp_namespace()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->csharp_namespace().data(), this->csharp_namespace().length(),
+      this->csharp_namespace().data(), static_cast<int>(this->csharp_namespace().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.csharp_namespace");
     target =
@@ -8728,9 +8410,9 @@ void FileOptions::SerializeWithCachedSizes(
   }
 
   // optional string swift_prefix = 39;
-  if (has_swift_prefix()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->swift_prefix().data(), this->swift_prefix().length(),
+      this->swift_prefix().data(), static_cast<int>(this->swift_prefix().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.FileOptions.swift_prefix");
     target =
@@ -8738,11 +8420,61 @@ void FileOptions::SerializeWithCachedSizes(
         39, this->swift_prefix(), target);
   }
 
+  // optional string php_class_prefix = 40;
+  if (cached_has_bits & 0x00000040u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_class_prefix().data(), static_cast<int>(this->php_class_prefix().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_class_prefix");
+    target =
+      ::google::protobuf::internal::WireFormatLite::WriteStringToArray(
+        40, this->php_class_prefix(), target);
+  }
+
+  // optional string php_namespace = 41;
+  if (cached_has_bits & 0x00000080u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_namespace().data(), static_cast<int>(this->php_namespace().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_namespace");
+    target =
+      ::google::protobuf::internal::WireFormatLite::WriteStringToArray(
+        41, this->php_namespace(), target);
+  }
+
+  // optional bool php_generic_services = 42 [default = false];
+  if (cached_has_bits & 0x00010000u) {
+    target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(42, this->php_generic_services(), target);
+  }
+
+  // optional string php_metadata_namespace = 44;
+  if (cached_has_bits & 0x00000100u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->php_metadata_namespace().data(), static_cast<int>(this->php_metadata_namespace().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.php_metadata_namespace");
+    target =
+      ::google::protobuf::internal::WireFormatLite::WriteStringToArray(
+        44, this->php_metadata_namespace(), target);
+  }
+
+  // optional string ruby_package = 45;
+  if (cached_has_bits & 0x00000200u) {
+    ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
+      this->ruby_package().data(), static_cast<int>(this->ruby_package().length()),
+      ::google::protobuf::internal::WireFormat::SERIALIZE,
+      "google.protobuf.FileOptions.ruby_package");
+    target =
+      ::google::protobuf::internal::WireFormatLite::WriteStringToArray(
+        45, this->ruby_package(), target);
+  }
+
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -8751,7 +8483,7 @@ void FileOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FileOptions)
   return target;
@@ -8766,16 +8498,16 @@ size_t FileOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -8822,6 +8554,36 @@ size_t FileOptions::ByteSizeLong() const {
           this->swift_prefix());
     }
 
+    // optional string php_class_prefix = 40;
+    if (has_php_class_prefix()) {
+      total_size += 2 +
+        ::google::protobuf::internal::WireFormatLite::StringSize(
+          this->php_class_prefix());
+    }
+
+    // optional string php_namespace = 41;
+    if (has_php_namespace()) {
+      total_size += 2 +
+        ::google::protobuf::internal::WireFormatLite::StringSize(
+          this->php_namespace());
+    }
+
+  }
+  if (_has_bits_[8 / 32] & 65280u) {
+    // optional string php_metadata_namespace = 44;
+    if (has_php_metadata_namespace()) {
+      total_size += 2 +
+        ::google::protobuf::internal::WireFormatLite::StringSize(
+          this->php_metadata_namespace());
+    }
+
+    // optional string ruby_package = 45;
+    if (has_ruby_package()) {
+      total_size += 2 +
+        ::google::protobuf::internal::WireFormatLite::StringSize(
+          this->ruby_package());
+    }
+
     // optional bool java_multiple_files = 10 [default = false];
     if (has_java_multiple_files()) {
       total_size += 1 + 1;
@@ -8832,8 +8594,6 @@ size_t FileOptions::ByteSizeLong() const {
       total_size += 2 + 1;
     }
 
-  }
-  if (_has_bits_[8 / 32] & 32512u) {
     // optional bool java_string_check_utf8 = 27 [default = false];
     if (has_java_string_check_utf8()) {
       total_size += 2 + 1;
@@ -8854,6 +8614,13 @@ size_t FileOptions::ByteSizeLong() const {
       total_size += 2 + 1;
     }
 
+  }
+  if (_has_bits_[16 / 32] & 983040u) {
+    // optional bool php_generic_services = 42 [default = false];
+    if (has_php_generic_services()) {
+      total_size += 2 + 1;
+    }
+
     // optional bool deprecated = 23 [default = false];
     if (has_deprecated()) {
       total_size += 2 + 1;
@@ -8872,9 +8639,7 @@ size_t FileOptions::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -8898,61 +8663,78 @@ void FileOptions::MergeFrom(const FileOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
-  if (from._has_bits_[0 / 32] & 255u) {
-    if (from.has_java_package()) {
-      set_has_java_package();
-      java_package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_package_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 255u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_java_package(from.java_package());
     }
-    if (from.has_java_outer_classname()) {
-      set_has_java_outer_classname();
-      java_outer_classname_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.java_outer_classname_);
+    if (cached_has_bits & 0x00000002u) {
+      set_java_outer_classname(from.java_outer_classname());
     }
-    if (from.has_go_package()) {
-      set_has_go_package();
-      go_package_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.go_package_);
+    if (cached_has_bits & 0x00000004u) {
+      set_go_package(from.go_package());
     }
-    if (from.has_objc_class_prefix()) {
-      set_has_objc_class_prefix();
-      objc_class_prefix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.objc_class_prefix_);
+    if (cached_has_bits & 0x00000008u) {
+      set_objc_class_prefix(from.objc_class_prefix());
     }
-    if (from.has_csharp_namespace()) {
-      set_has_csharp_namespace();
-      csharp_namespace_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.csharp_namespace_);
+    if (cached_has_bits & 0x00000010u) {
+      set_csharp_namespace(from.csharp_namespace());
     }
-    if (from.has_swift_prefix()) {
-      set_has_swift_prefix();
-      swift_prefix_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.swift_prefix_);
+    if (cached_has_bits & 0x00000020u) {
+      set_swift_prefix(from.swift_prefix());
     }
-    if (from.has_java_multiple_files()) {
-      set_java_multiple_files(from.java_multiple_files());
+    if (cached_has_bits & 0x00000040u) {
+      set_php_class_prefix(from.php_class_prefix());
     }
-    if (from.has_java_generate_equals_and_hash()) {
-      set_java_generate_equals_and_hash(from.java_generate_equals_and_hash());
+    if (cached_has_bits & 0x00000080u) {
+      set_php_namespace(from.php_namespace());
     }
   }
-  if (from._has_bits_[8 / 32] & 32512u) {
-    if (from.has_java_string_check_utf8()) {
-      set_java_string_check_utf8(from.java_string_check_utf8());
+  if (cached_has_bits & 65280u) {
+    if (cached_has_bits & 0x00000100u) {
+      set_php_metadata_namespace(from.php_metadata_namespace());
+    }
+    if (cached_has_bits & 0x00000200u) {
+      set_ruby_package(from.ruby_package());
     }
-    if (from.has_cc_generic_services()) {
-      set_cc_generic_services(from.cc_generic_services());
+    if (cached_has_bits & 0x00000400u) {
+      java_multiple_files_ = from.java_multiple_files_;
     }
-    if (from.has_java_generic_services()) {
-      set_java_generic_services(from.java_generic_services());
+    if (cached_has_bits & 0x00000800u) {
+      java_generate_equals_and_hash_ = from.java_generate_equals_and_hash_;
     }
-    if (from.has_py_generic_services()) {
-      set_py_generic_services(from.py_generic_services());
+    if (cached_has_bits & 0x00001000u) {
+      java_string_check_utf8_ = from.java_string_check_utf8_;
+    }
+    if (cached_has_bits & 0x00002000u) {
+      cc_generic_services_ = from.cc_generic_services_;
+    }
+    if (cached_has_bits & 0x00004000u) {
+      java_generic_services_ = from.java_generic_services_;
+    }
+    if (cached_has_bits & 0x00008000u) {
+      py_generic_services_ = from.py_generic_services_;
+    }
+    _has_bits_[0] |= cached_has_bits;
+  }
+  if (cached_has_bits & 983040u) {
+    if (cached_has_bits & 0x00010000u) {
+      php_generic_services_ = from.php_generic_services_;
     }
-    if (from.has_deprecated()) {
-      set_deprecated(from.deprecated());
+    if (cached_has_bits & 0x00020000u) {
+      deprecated_ = from.deprecated_;
     }
-    if (from.has_cc_enable_arenas()) {
-      set_cc_enable_arenas(from.cc_enable_arenas());
+    if (cached_has_bits & 0x00040000u) {
+      cc_enable_arenas_ = from.cc_enable_arenas_;
     }
-    if (from.has_optimize_for()) {
-      set_optimize_for(from.optimize_for());
+    if (cached_has_bits & 0x00080000u) {
+      optimize_for_ = from.optimize_for_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -8981,662 +8763,71 @@ bool FileOptions::IsInitialized() const {
 
 void FileOptions::Swap(FileOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    FileOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void FileOptions::UnsafeArenaSwap(FileOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void FileOptions::InternalSwap(FileOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  java_package_.Swap(&other->java_package_);
-  java_outer_classname_.Swap(&other->java_outer_classname_);
-  go_package_.Swap(&other->go_package_);
-  objc_class_prefix_.Swap(&other->objc_class_prefix_);
-  csharp_namespace_.Swap(&other->csharp_namespace_);
-  swift_prefix_.Swap(&other->swift_prefix_);
-  std::swap(java_multiple_files_, other->java_multiple_files_);
-  std::swap(java_generate_equals_and_hash_, other->java_generate_equals_and_hash_);
-  std::swap(java_string_check_utf8_, other->java_string_check_utf8_);
-  std::swap(cc_generic_services_, other->cc_generic_services_);
-  std::swap(java_generic_services_, other->java_generic_services_);
-  std::swap(py_generic_services_, other->py_generic_services_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(cc_enable_arenas_, other->cc_enable_arenas_);
-  std::swap(optimize_for_, other->optimize_for_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  java_package_.Swap(&other->java_package_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  java_outer_classname_.Swap(&other->java_outer_classname_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  go_package_.Swap(&other->go_package_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  objc_class_prefix_.Swap(&other->objc_class_prefix_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  csharp_namespace_.Swap(&other->csharp_namespace_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swift_prefix_.Swap(&other->swift_prefix_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  php_class_prefix_.Swap(&other->php_class_prefix_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  php_namespace_.Swap(&other->php_namespace_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  php_metadata_namespace_.Swap(&other->php_metadata_namespace_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  ruby_package_.Swap(&other->ruby_package_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(java_multiple_files_, other->java_multiple_files_);
+  swap(java_generate_equals_and_hash_, other->java_generate_equals_and_hash_);
+  swap(java_string_check_utf8_, other->java_string_check_utf8_);
+  swap(cc_generic_services_, other->cc_generic_services_);
+  swap(java_generic_services_, other->java_generic_services_);
+  swap(py_generic_services_, other->py_generic_services_);
+  swap(php_generic_services_, other->php_generic_services_);
+  swap(deprecated_, other->deprecated_);
+  swap(cc_enable_arenas_, other->cc_enable_arenas_);
+  swap(optimize_for_, other->optimize_for_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata FileOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[11];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FileOptions
-
-// optional string java_package = 1;
-bool FileOptions::has_java_package() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void FileOptions::set_has_java_package() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void FileOptions::clear_has_java_package() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void FileOptions::clear_java_package() {
-  java_package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_java_package();
-}
-const ::std::string& FileOptions::java_package() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_package)
-  return java_package_.GetNoArena();
-}
-void FileOptions::set_java_package(const ::std::string& value) {
-  set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_package)
-}
-#if LANG_CXX11
-void FileOptions::set_java_package(::std::string&& value) {
-  set_has_java_package();
-  java_package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.java_package)
-}
-#endif
-void FileOptions::set_java_package(const char* value) {
-  set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.java_package)
-}
-void FileOptions::set_java_package(const char* value, size_t size) {
-  set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.java_package)
-}
-::std::string* FileOptions::mutable_java_package() {
-  set_has_java_package();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.java_package)
-  return java_package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_java_package() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.java_package)
-  clear_has_java_package();
-  return java_package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_java_package(::std::string* java_package) {
-  if (java_package != NULL) {
-    set_has_java_package();
-  } else {
-    clear_has_java_package();
-  }
-  java_package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_package);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.java_package)
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// optional string java_outer_classname = 8;
-bool FileOptions::has_java_outer_classname() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void FileOptions::set_has_java_outer_classname() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void FileOptions::clear_has_java_outer_classname() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void FileOptions::clear_java_outer_classname() {
-  java_outer_classname_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_java_outer_classname();
-}
-const ::std::string& FileOptions::java_outer_classname() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_outer_classname)
-  return java_outer_classname_.GetNoArena();
-}
-void FileOptions::set_java_outer_classname(const ::std::string& value) {
-  set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_outer_classname)
-}
-#if LANG_CXX11
-void FileOptions::set_java_outer_classname(::std::string&& value) {
-  set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.java_outer_classname)
-}
-#endif
-void FileOptions::set_java_outer_classname(const char* value) {
-  set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.java_outer_classname)
-}
-void FileOptions::set_java_outer_classname(const char* value, size_t size) {
-  set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.java_outer_classname)
-}
-::std::string* FileOptions::mutable_java_outer_classname() {
-  set_has_java_outer_classname();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.java_outer_classname)
-  return java_outer_classname_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_java_outer_classname() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.java_outer_classname)
-  clear_has_java_outer_classname();
-  return java_outer_classname_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_java_outer_classname(::std::string* java_outer_classname) {
-  if (java_outer_classname != NULL) {
-    set_has_java_outer_classname();
-  } else {
-    clear_has_java_outer_classname();
-  }
-  java_outer_classname_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_outer_classname);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.java_outer_classname)
-}
-
-// optional bool java_multiple_files = 10 [default = false];
-bool FileOptions::has_java_multiple_files() const {
-  return (_has_bits_[0] & 0x00000040u) != 0;
-}
-void FileOptions::set_has_java_multiple_files() {
-  _has_bits_[0] |= 0x00000040u;
-}
-void FileOptions::clear_has_java_multiple_files() {
-  _has_bits_[0] &= ~0x00000040u;
-}
-void FileOptions::clear_java_multiple_files() {
-  java_multiple_files_ = false;
-  clear_has_java_multiple_files();
-}
-bool FileOptions::java_multiple_files() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_multiple_files)
-  return java_multiple_files_;
-}
-void FileOptions::set_java_multiple_files(bool value) {
-  set_has_java_multiple_files();
-  java_multiple_files_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_multiple_files)
-}
-
-// optional bool java_generate_equals_and_hash = 20 [deprecated = true];
-bool FileOptions::has_java_generate_equals_and_hash() const {
-  return (_has_bits_[0] & 0x00000080u) != 0;
-}
-void FileOptions::set_has_java_generate_equals_and_hash() {
-  _has_bits_[0] |= 0x00000080u;
-}
-void FileOptions::clear_has_java_generate_equals_and_hash() {
-  _has_bits_[0] &= ~0x00000080u;
-}
-void FileOptions::clear_java_generate_equals_and_hash() {
-  java_generate_equals_and_hash_ = false;
-  clear_has_java_generate_equals_and_hash();
-}
-bool FileOptions::java_generate_equals_and_hash() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_generate_equals_and_hash)
-  return java_generate_equals_and_hash_;
-}
-void FileOptions::set_java_generate_equals_and_hash(bool value) {
-  set_has_java_generate_equals_and_hash();
-  java_generate_equals_and_hash_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_generate_equals_and_hash)
-}
-
-// optional bool java_string_check_utf8 = 27 [default = false];
-bool FileOptions::has_java_string_check_utf8() const {
-  return (_has_bits_[0] & 0x00000100u) != 0;
-}
-void FileOptions::set_has_java_string_check_utf8() {
-  _has_bits_[0] |= 0x00000100u;
-}
-void FileOptions::clear_has_java_string_check_utf8() {
-  _has_bits_[0] &= ~0x00000100u;
-}
-void FileOptions::clear_java_string_check_utf8() {
-  java_string_check_utf8_ = false;
-  clear_has_java_string_check_utf8();
-}
-bool FileOptions::java_string_check_utf8() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_string_check_utf8)
-  return java_string_check_utf8_;
-}
-void FileOptions::set_java_string_check_utf8(bool value) {
-  set_has_java_string_check_utf8();
-  java_string_check_utf8_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_string_check_utf8)
-}
-
-// optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];
-bool FileOptions::has_optimize_for() const {
-  return (_has_bits_[0] & 0x00004000u) != 0;
-}
-void FileOptions::set_has_optimize_for() {
-  _has_bits_[0] |= 0x00004000u;
-}
-void FileOptions::clear_has_optimize_for() {
-  _has_bits_[0] &= ~0x00004000u;
-}
-void FileOptions::clear_optimize_for() {
-  optimize_for_ = 1;
-  clear_has_optimize_for();
-}
-::google::protobuf::FileOptions_OptimizeMode FileOptions::optimize_for() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.optimize_for)
-  return static_cast< ::google::protobuf::FileOptions_OptimizeMode >(optimize_for_);
-}
-void FileOptions::set_optimize_for(::google::protobuf::FileOptions_OptimizeMode value) {
-  assert(::google::protobuf::FileOptions_OptimizeMode_IsValid(value));
-  set_has_optimize_for();
-  optimize_for_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.optimize_for)
-}
-
-// optional string go_package = 11;
-bool FileOptions::has_go_package() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void FileOptions::set_has_go_package() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void FileOptions::clear_has_go_package() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void FileOptions::clear_go_package() {
-  go_package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_go_package();
-}
-const ::std::string& FileOptions::go_package() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.go_package)
-  return go_package_.GetNoArena();
-}
-void FileOptions::set_go_package(const ::std::string& value) {
-  set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.go_package)
-}
-#if LANG_CXX11
-void FileOptions::set_go_package(::std::string&& value) {
-  set_has_go_package();
-  go_package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.go_package)
-}
-#endif
-void FileOptions::set_go_package(const char* value) {
-  set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.go_package)
-}
-void FileOptions::set_go_package(const char* value, size_t size) {
-  set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.go_package)
-}
-::std::string* FileOptions::mutable_go_package() {
-  set_has_go_package();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.go_package)
-  return go_package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_go_package() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.go_package)
-  clear_has_go_package();
-  return go_package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_go_package(::std::string* go_package) {
-  if (go_package != NULL) {
-    set_has_go_package();
-  } else {
-    clear_has_go_package();
-  }
-  go_package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), go_package);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.go_package)
-}
-
-// optional bool cc_generic_services = 16 [default = false];
-bool FileOptions::has_cc_generic_services() const {
-  return (_has_bits_[0] & 0x00000200u) != 0;
-}
-void FileOptions::set_has_cc_generic_services() {
-  _has_bits_[0] |= 0x00000200u;
-}
-void FileOptions::clear_has_cc_generic_services() {
-  _has_bits_[0] &= ~0x00000200u;
-}
-void FileOptions::clear_cc_generic_services() {
-  cc_generic_services_ = false;
-  clear_has_cc_generic_services();
-}
-bool FileOptions::cc_generic_services() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.cc_generic_services)
-  return cc_generic_services_;
-}
-void FileOptions::set_cc_generic_services(bool value) {
-  set_has_cc_generic_services();
-  cc_generic_services_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.cc_generic_services)
-}
-
-// optional bool java_generic_services = 17 [default = false];
-bool FileOptions::has_java_generic_services() const {
-  return (_has_bits_[0] & 0x00000400u) != 0;
-}
-void FileOptions::set_has_java_generic_services() {
-  _has_bits_[0] |= 0x00000400u;
-}
-void FileOptions::clear_has_java_generic_services() {
-  _has_bits_[0] &= ~0x00000400u;
-}
-void FileOptions::clear_java_generic_services() {
-  java_generic_services_ = false;
-  clear_has_java_generic_services();
-}
-bool FileOptions::java_generic_services() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_generic_services)
-  return java_generic_services_;
-}
-void FileOptions::set_java_generic_services(bool value) {
-  set_has_java_generic_services();
-  java_generic_services_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_generic_services)
-}
-
-// optional bool py_generic_services = 18 [default = false];
-bool FileOptions::has_py_generic_services() const {
-  return (_has_bits_[0] & 0x00000800u) != 0;
-}
-void FileOptions::set_has_py_generic_services() {
-  _has_bits_[0] |= 0x00000800u;
-}
-void FileOptions::clear_has_py_generic_services() {
-  _has_bits_[0] &= ~0x00000800u;
-}
-void FileOptions::clear_py_generic_services() {
-  py_generic_services_ = false;
-  clear_has_py_generic_services();
-}
-bool FileOptions::py_generic_services() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.py_generic_services)
-  return py_generic_services_;
-}
-void FileOptions::set_py_generic_services(bool value) {
-  set_has_py_generic_services();
-  py_generic_services_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.py_generic_services)
-}
-
-// optional bool deprecated = 23 [default = false];
-bool FileOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00001000u) != 0;
-}
-void FileOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00001000u;
-}
-void FileOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00001000u;
-}
-void FileOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool FileOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.deprecated)
-  return deprecated_;
-}
-void FileOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.deprecated)
-}
-
-// optional bool cc_enable_arenas = 31 [default = false];
-bool FileOptions::has_cc_enable_arenas() const {
-  return (_has_bits_[0] & 0x00002000u) != 0;
-}
-void FileOptions::set_has_cc_enable_arenas() {
-  _has_bits_[0] |= 0x00002000u;
-}
-void FileOptions::clear_has_cc_enable_arenas() {
-  _has_bits_[0] &= ~0x00002000u;
-}
-void FileOptions::clear_cc_enable_arenas() {
-  cc_enable_arenas_ = false;
-  clear_has_cc_enable_arenas();
-}
-bool FileOptions::cc_enable_arenas() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.cc_enable_arenas)
-  return cc_enable_arenas_;
-}
-void FileOptions::set_cc_enable_arenas(bool value) {
-  set_has_cc_enable_arenas();
-  cc_enable_arenas_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.cc_enable_arenas)
-}
-
-// optional string objc_class_prefix = 36;
-bool FileOptions::has_objc_class_prefix() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void FileOptions::set_has_objc_class_prefix() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void FileOptions::clear_has_objc_class_prefix() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void FileOptions::clear_objc_class_prefix() {
-  objc_class_prefix_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_objc_class_prefix();
-}
-const ::std::string& FileOptions::objc_class_prefix() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.objc_class_prefix)
-  return objc_class_prefix_.GetNoArena();
-}
-void FileOptions::set_objc_class_prefix(const ::std::string& value) {
-  set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.objc_class_prefix)
-}
-#if LANG_CXX11
-void FileOptions::set_objc_class_prefix(::std::string&& value) {
-  set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.objc_class_prefix)
-}
-#endif
-void FileOptions::set_objc_class_prefix(const char* value) {
-  set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.objc_class_prefix)
-}
-void FileOptions::set_objc_class_prefix(const char* value, size_t size) {
-  set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.objc_class_prefix)
-}
-::std::string* FileOptions::mutable_objc_class_prefix() {
-  set_has_objc_class_prefix();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.objc_class_prefix)
-  return objc_class_prefix_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_objc_class_prefix() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.objc_class_prefix)
-  clear_has_objc_class_prefix();
-  return objc_class_prefix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_objc_class_prefix(::std::string* objc_class_prefix) {
-  if (objc_class_prefix != NULL) {
-    set_has_objc_class_prefix();
-  } else {
-    clear_has_objc_class_prefix();
-  }
-  objc_class_prefix_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), objc_class_prefix);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.objc_class_prefix)
-}
-
-// optional string csharp_namespace = 37;
-bool FileOptions::has_csharp_namespace() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void FileOptions::set_has_csharp_namespace() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void FileOptions::clear_has_csharp_namespace() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void FileOptions::clear_csharp_namespace() {
-  csharp_namespace_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_csharp_namespace();
-}
-const ::std::string& FileOptions::csharp_namespace() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.csharp_namespace)
-  return csharp_namespace_.GetNoArena();
-}
-void FileOptions::set_csharp_namespace(const ::std::string& value) {
-  set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.csharp_namespace)
-}
-#if LANG_CXX11
-void FileOptions::set_csharp_namespace(::std::string&& value) {
-  set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.csharp_namespace)
-}
-#endif
-void FileOptions::set_csharp_namespace(const char* value) {
-  set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.csharp_namespace)
-}
-void FileOptions::set_csharp_namespace(const char* value, size_t size) {
-  set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.csharp_namespace)
-}
-::std::string* FileOptions::mutable_csharp_namespace() {
-  set_has_csharp_namespace();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.csharp_namespace)
-  return csharp_namespace_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_csharp_namespace() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.csharp_namespace)
-  clear_has_csharp_namespace();
-  return csharp_namespace_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_csharp_namespace(::std::string* csharp_namespace) {
-  if (csharp_namespace != NULL) {
-    set_has_csharp_namespace();
-  } else {
-    clear_has_csharp_namespace();
-  }
-  csharp_namespace_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), csharp_namespace);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.csharp_namespace)
-}
-
-// optional string swift_prefix = 39;
-bool FileOptions::has_swift_prefix() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
-}
-void FileOptions::set_has_swift_prefix() {
-  _has_bits_[0] |= 0x00000020u;
-}
-void FileOptions::clear_has_swift_prefix() {
-  _has_bits_[0] &= ~0x00000020u;
-}
-void FileOptions::clear_swift_prefix() {
-  swift_prefix_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_swift_prefix();
-}
-const ::std::string& FileOptions::swift_prefix() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.swift_prefix)
-  return swift_prefix_.GetNoArena();
-}
-void FileOptions::set_swift_prefix(const ::std::string& value) {
-  set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.swift_prefix)
-}
-#if LANG_CXX11
-void FileOptions::set_swift_prefix(::std::string&& value) {
-  set_has_swift_prefix();
-  swift_prefix_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.swift_prefix)
-}
-#endif
-void FileOptions::set_swift_prefix(const char* value) {
-  set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.swift_prefix)
-}
-void FileOptions::set_swift_prefix(const char* value, size_t size) {
-  set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.swift_prefix)
-}
-::std::string* FileOptions::mutable_swift_prefix() {
-  set_has_swift_prefix();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.swift_prefix)
-  return swift_prefix_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* FileOptions::release_swift_prefix() {
-  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.swift_prefix)
-  clear_has_swift_prefix();
-  return swift_prefix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void FileOptions::set_allocated_swift_prefix(::std::string* swift_prefix) {
-  if (swift_prefix != NULL) {
-    set_has_swift_prefix();
-  } else {
-    clear_has_swift_prefix();
-  }
-  swift_prefix_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), swift_prefix);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.swift_prefix)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int FileOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void FileOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& FileOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* FileOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* FileOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-FileOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-FileOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void MessageOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int MessageOptions::kMessageSetWireFormatFieldNumber;
 const int MessageOptions::kNoStandardDescriptorAccessorFieldNumber;
@@ -9647,30 +8838,38 @@ const int MessageOptions::kUninterpretedOptionFieldNumber;
 
 MessageOptions::MessageOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MessageOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.MessageOptions)
 }
+MessageOptions::MessageOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MessageOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.MessageOptions)
+}
 MessageOptions::MessageOptions(const MessageOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
   ::memcpy(&message_set_wire_format_, &from.message_set_wire_format_,
-    reinterpret_cast<char*>(&map_entry_) -
-    reinterpret_cast<char*>(&message_set_wire_format_) + sizeof(map_entry_));
+    static_cast<size_t>(reinterpret_cast<char*>(&map_entry_) -
+    reinterpret_cast<char*>(&message_set_wire_format_)) + sizeof(map_entry_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.MessageOptions)
 }
 
 void MessageOptions::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&message_set_wire_format_, 0, reinterpret_cast<char*>(&map_entry_) -
-    reinterpret_cast<char*>(&message_set_wire_format_) + sizeof(map_entry_));
+  ::memset(&message_set_wire_format_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&map_entry_) -
+      reinterpret_cast<char*>(&message_set_wire_format_)) + sizeof(map_entry_));
 }
 
 MessageOptions::~MessageOptions() {
@@ -9679,39 +8878,40 @@ MessageOptions::~MessageOptions() {
 }
 
 void MessageOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void MessageOptions::ArenaDtor(void* object) {
+  MessageOptions* _this = reinterpret_cast< MessageOptions* >(object);
+  (void)_this;
+}
+void MessageOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void MessageOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* MessageOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[12].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const MessageOptions& MessageOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MessageOptions.base);
   return *internal_default_instance();
 }
 
-MessageOptions* MessageOptions::New(::google::protobuf::Arena* arena) const {
-  MessageOptions* n = new MessageOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void MessageOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.MessageOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
-  if (_has_bits_[0 / 32] & 15u) {
-    ::memset(&message_set_wire_format_, 0, reinterpret_cast<char*>(&map_entry_) -
-      reinterpret_cast<char*>(&message_set_wire_format_) + sizeof(map_entry_));
-  }
+  ::memset(&message_set_wire_format_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&map_entry_) -
+      reinterpret_cast<char*>(&message_set_wire_format_)) + sizeof(map_entry_));
   _has_bits_.Clear();
   _internal_metadata_.Clear();
 }
@@ -9722,14 +8922,14 @@ bool MessageOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.MessageOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional bool message_set_wire_format = 1 [default = false];
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           set_has_message_set_wire_format();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -9743,7 +8943,7 @@ bool MessageOptions::MergePartialFromCodedStream(
       // optional bool no_standard_descriptor_accessor = 2 [default = false];
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_no_standard_descriptor_accessor();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -9757,7 +8957,7 @@ bool MessageOptions::MergePartialFromCodedStream(
       // optional bool deprecated = 3 [default = false];
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -9771,7 +8971,7 @@ bool MessageOptions::MergePartialFromCodedStream(
       // optional bool map_entry = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(56u)) {
+            static_cast< ::google::protobuf::uint8>(56u /* 56 & 0xFF */)) {
           set_has_map_entry();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -9785,31 +8985,28 @@ bool MessageOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -9826,30 +9023,37 @@ failure:
 void MessageOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.MessageOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool message_set_wire_format = 1 [default = false];
-  if (has_message_set_wire_format()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(1, this->message_set_wire_format(), output);
   }
 
   // optional bool no_standard_descriptor_accessor = 2 [default = false];
-  if (has_no_standard_descriptor_accessor()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(2, this->no_standard_descriptor_accessor(), output);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(3, this->deprecated(), output);
   }
 
   // optional bool map_entry = 7;
-  if (has_map_entry()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(7, this->map_entry(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -9858,40 +9062,45 @@ void MessageOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.MessageOptions)
 }
 
 ::google::protobuf::uint8* MessageOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.MessageOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool message_set_wire_format = 1 [default = false];
-  if (has_message_set_wire_format()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(1, this->message_set_wire_format(), target);
   }
 
   // optional bool no_standard_descriptor_accessor = 2 [default = false];
-  if (has_no_standard_descriptor_accessor()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(2, this->no_standard_descriptor_accessor(), target);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(3, this->deprecated(), target);
   }
 
   // optional bool map_entry = 7;
-  if (has_map_entry()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(7, this->map_entry(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -9900,7 +9109,7 @@ void MessageOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.MessageOptions)
   return target;
@@ -9915,16 +9124,16 @@ size_t MessageOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -9951,9 +9160,7 @@ size_t MessageOptions::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -9977,20 +9184,25 @@ void MessageOptions::MergeFrom(const MessageOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
-  if (from._has_bits_[0 / 32] & 15u) {
-    if (from.has_message_set_wire_format()) {
-      set_message_set_wire_format(from.message_set_wire_format());
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 15u) {
+    if (cached_has_bits & 0x00000001u) {
+      message_set_wire_format_ = from.message_set_wire_format_;
     }
-    if (from.has_no_standard_descriptor_accessor()) {
-      set_no_standard_descriptor_accessor(from.no_standard_descriptor_accessor());
+    if (cached_has_bits & 0x00000002u) {
+      no_standard_descriptor_accessor_ = from.no_standard_descriptor_accessor_;
     }
-    if (from.has_deprecated()) {
-      set_deprecated(from.deprecated());
+    if (cached_has_bits & 0x00000004u) {
+      deprecated_ = from.deprecated_;
     }
-    if (from.has_map_entry()) {
-      set_map_entry(from.map_entry());
+    if (cached_has_bits & 0x00000008u) {
+      map_entry_ = from.map_entry_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -10019,158 +9231,45 @@ bool MessageOptions::IsInitialized() const {
 
 void MessageOptions::Swap(MessageOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    MessageOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void MessageOptions::UnsafeArenaSwap(MessageOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void MessageOptions::InternalSwap(MessageOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(message_set_wire_format_, other->message_set_wire_format_);
-  std::swap(no_standard_descriptor_accessor_, other->no_standard_descriptor_accessor_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(map_entry_, other->map_entry_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(message_set_wire_format_, other->message_set_wire_format_);
+  swap(no_standard_descriptor_accessor_, other->no_standard_descriptor_accessor_);
+  swap(deprecated_, other->deprecated_);
+  swap(map_entry_, other->map_entry_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata MessageOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[12];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// MessageOptions
-
-// optional bool message_set_wire_format = 1 [default = false];
-bool MessageOptions::has_message_set_wire_format() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void MessageOptions::set_has_message_set_wire_format() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void MessageOptions::clear_has_message_set_wire_format() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void MessageOptions::clear_message_set_wire_format() {
-  message_set_wire_format_ = false;
-  clear_has_message_set_wire_format();
-}
-bool MessageOptions::message_set_wire_format() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.message_set_wire_format)
-  return message_set_wire_format_;
-}
-void MessageOptions::set_message_set_wire_format(bool value) {
-  set_has_message_set_wire_format();
-  message_set_wire_format_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MessageOptions.message_set_wire_format)
-}
-
-// optional bool no_standard_descriptor_accessor = 2 [default = false];
-bool MessageOptions::has_no_standard_descriptor_accessor() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void MessageOptions::set_has_no_standard_descriptor_accessor() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void MessageOptions::clear_has_no_standard_descriptor_accessor() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void MessageOptions::clear_no_standard_descriptor_accessor() {
-  no_standard_descriptor_accessor_ = false;
-  clear_has_no_standard_descriptor_accessor();
-}
-bool MessageOptions::no_standard_descriptor_accessor() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.no_standard_descriptor_accessor)
-  return no_standard_descriptor_accessor_;
-}
-void MessageOptions::set_no_standard_descriptor_accessor(bool value) {
-  set_has_no_standard_descriptor_accessor();
-  no_standard_descriptor_accessor_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MessageOptions.no_standard_descriptor_accessor)
-}
-
-// optional bool deprecated = 3 [default = false];
-bool MessageOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void MessageOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void MessageOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void MessageOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool MessageOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.deprecated)
-  return deprecated_;
-}
-void MessageOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MessageOptions.deprecated)
-}
-
-// optional bool map_entry = 7;
-bool MessageOptions::has_map_entry() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void MessageOptions::set_has_map_entry() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void MessageOptions::clear_has_map_entry() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void MessageOptions::clear_map_entry() {
-  map_entry_ = false;
-  clear_has_map_entry();
-}
-bool MessageOptions::map_entry() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.map_entry)
-  return map_entry_;
-}
-void MessageOptions::set_map_entry(bool value) {
-  set_has_map_entry();
-  map_entry_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MessageOptions.map_entry)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int MessageOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void MessageOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& MessageOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* MessageOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* MessageOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-MessageOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.MessageOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-MessageOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_;
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void FieldOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FieldOptions::kCtypeFieldNumber;
 const int FieldOptions::kPackedFieldNumber;
@@ -10183,30 +9282,38 @@ const int FieldOptions::kUninterpretedOptionFieldNumber;
 
 FieldOptions::FieldOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FieldOptions)
 }
+FieldOptions::FieldOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.FieldOptions)
+}
 FieldOptions::FieldOptions(const FieldOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
   ::memcpy(&ctype_, &from.ctype_,
-    reinterpret_cast<char*>(&weak_) -
-    reinterpret_cast<char*>(&ctype_) + sizeof(weak_));
+    static_cast<size_t>(reinterpret_cast<char*>(&jstype_) -
+    reinterpret_cast<char*>(&ctype_)) + sizeof(jstype_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FieldOptions)
 }
 
 void FieldOptions::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&ctype_, 0, reinterpret_cast<char*>(&weak_) -
-    reinterpret_cast<char*>(&ctype_) + sizeof(weak_));
+  ::memset(&ctype_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&jstype_) -
+      reinterpret_cast<char*>(&ctype_)) + sizeof(jstype_));
 }
 
 FieldOptions::~FieldOptions() {
@@ -10215,38 +9322,42 @@ FieldOptions::~FieldOptions() {
 }
 
 void FieldOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void FieldOptions::ArenaDtor(void* object) {
+  FieldOptions* _this = reinterpret_cast< FieldOptions* >(object);
+  (void)_this;
+}
+void FieldOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void FieldOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FieldOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[13].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FieldOptions& FieldOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_FieldOptions.base);
   return *internal_default_instance();
 }
 
-FieldOptions* FieldOptions::New(::google::protobuf::Arena* arena) const {
-  FieldOptions* n = new FieldOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FieldOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FieldOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
-  if (_has_bits_[0 / 32] & 63u) {
-    ::memset(&ctype_, 0, reinterpret_cast<char*>(&weak_) -
-      reinterpret_cast<char*>(&ctype_) + sizeof(weak_));
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 63u) {
+    ::memset(&ctype_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&jstype_) -
+        reinterpret_cast<char*>(&ctype_)) + sizeof(jstype_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -10258,14 +9369,14 @@ bool FieldOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FieldOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -10273,7 +9384,8 @@ bool FieldOptions::MergePartialFromCodedStream(
           if (::google::protobuf::FieldOptions_CType_IsValid(value)) {
             set_ctype(static_cast< ::google::protobuf::FieldOptions_CType >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(1, value);
+            mutable_unknown_fields()->AddVarint(
+                1, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -10284,7 +9396,7 @@ bool FieldOptions::MergePartialFromCodedStream(
       // optional bool packed = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_packed();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -10298,7 +9410,7 @@ bool FieldOptions::MergePartialFromCodedStream(
       // optional bool deprecated = 3 [default = false];
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -10312,7 +9424,7 @@ bool FieldOptions::MergePartialFromCodedStream(
       // optional bool lazy = 5 [default = false];
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
           set_has_lazy();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -10326,7 +9438,7 @@ bool FieldOptions::MergePartialFromCodedStream(
       // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(48u)) {
+            static_cast< ::google::protobuf::uint8>(48u /* 48 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -10334,7 +9446,8 @@ bool FieldOptions::MergePartialFromCodedStream(
           if (::google::protobuf::FieldOptions_JSType_IsValid(value)) {
             set_jstype(static_cast< ::google::protobuf::FieldOptions_JSType >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(6, value);
+            mutable_unknown_fields()->AddVarint(
+                6, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -10345,7 +9458,7 @@ bool FieldOptions::MergePartialFromCodedStream(
       // optional bool weak = 10 [default = false];
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(80u)) {
+            static_cast< ::google::protobuf::uint8>(80u /* 80 & 0xFF */)) {
           set_has_weak();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -10359,31 +9472,28 @@ bool FieldOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -10400,42 +9510,49 @@ failure:
 void FieldOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FieldOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];
-  if (has_ctype()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       1, this->ctype(), output);
   }
 
   // optional bool packed = 2;
-  if (has_packed()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(2, this->packed(), output);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(3, this->deprecated(), output);
   }
 
   // optional bool lazy = 5 [default = false];
-  if (has_lazy()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(5, this->lazy(), output);
   }
 
   // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
-  if (has_jstype()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       6, this->jstype(), output);
   }
 
   // optional bool weak = 10 [default = false];
-  if (has_weak()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(10, this->weak(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -10444,52 +9561,57 @@ void FieldOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FieldOptions)
 }
 
 ::google::protobuf::uint8* FieldOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FieldOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];
-  if (has_ctype()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       1, this->ctype(), target);
   }
 
   // optional bool packed = 2;
-  if (has_packed()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(2, this->packed(), target);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(3, this->deprecated(), target);
   }
 
   // optional bool lazy = 5 [default = false];
-  if (has_lazy()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(5, this->lazy(), target);
   }
 
   // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
-  if (has_jstype()) {
+  if (cached_has_bits & 0x00000020u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       6, this->jstype(), target);
   }
 
   // optional bool weak = 10 [default = false];
-  if (has_weak()) {
+  if (cached_has_bits & 0x00000010u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(10, this->weak(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -10498,7 +9620,7 @@ void FieldOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FieldOptions)
   return target;
@@ -10513,16 +9635,16 @@ size_t FieldOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -10533,12 +9655,6 @@ size_t FieldOptions::ByteSizeLong() const {
         ::google::protobuf::internal::WireFormatLite::EnumSize(this->ctype());
     }
 
-    // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
-    if (has_jstype()) {
-      total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::EnumSize(this->jstype());
-    }
-
     // optional bool packed = 2;
     if (has_packed()) {
       total_size += 1 + 1;
@@ -10559,11 +9675,15 @@ size_t FieldOptions::ByteSizeLong() const {
       total_size += 1 + 1;
     }
 
+    // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
+    if (has_jstype()) {
+      total_size += 1 +
+        ::google::protobuf::internal::WireFormatLite::EnumSize(this->jstype());
+    }
+
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -10587,26 +9707,31 @@ void FieldOptions::MergeFrom(const FieldOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
-  if (from._has_bits_[0 / 32] & 63u) {
-    if (from.has_ctype()) {
-      set_ctype(from.ctype());
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 63u) {
+    if (cached_has_bits & 0x00000001u) {
+      ctype_ = from.ctype_;
     }
-    if (from.has_jstype()) {
-      set_jstype(from.jstype());
+    if (cached_has_bits & 0x00000002u) {
+      packed_ = from.packed_;
     }
-    if (from.has_packed()) {
-      set_packed(from.packed());
+    if (cached_has_bits & 0x00000004u) {
+      lazy_ = from.lazy_;
     }
-    if (from.has_lazy()) {
-      set_lazy(from.lazy());
+    if (cached_has_bits & 0x00000008u) {
+      deprecated_ = from.deprecated_;
     }
-    if (from.has_deprecated()) {
-      set_deprecated(from.deprecated());
+    if (cached_has_bits & 0x00000010u) {
+      weak_ = from.weak_;
     }
-    if (from.has_weak()) {
-      set_weak(from.weak());
+    if (cached_has_bits & 0x00000020u) {
+      jstype_ = from.jstype_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -10635,227 +9760,72 @@ bool FieldOptions::IsInitialized() const {
 
 void FieldOptions::Swap(FieldOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    FieldOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void FieldOptions::UnsafeArenaSwap(FieldOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void FieldOptions::InternalSwap(FieldOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(ctype_, other->ctype_);
-  std::swap(jstype_, other->jstype_);
-  std::swap(packed_, other->packed_);
-  std::swap(lazy_, other->lazy_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(weak_, other->weak_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(ctype_, other->ctype_);
+  swap(packed_, other->packed_);
+  swap(lazy_, other->lazy_);
+  swap(deprecated_, other->deprecated_);
+  swap(weak_, other->weak_);
+  swap(jstype_, other->jstype_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata FieldOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[13];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FieldOptions
-
-// optional .google.protobuf.FieldOptions.CType ctype = 1 [default = STRING];
-bool FieldOptions::has_ctype() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void FieldOptions::set_has_ctype() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void FieldOptions::clear_has_ctype() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void FieldOptions::clear_ctype() {
-  ctype_ = 0;
-  clear_has_ctype();
-}
-::google::protobuf::FieldOptions_CType FieldOptions::ctype() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.ctype)
-  return static_cast< ::google::protobuf::FieldOptions_CType >(ctype_);
-}
-void FieldOptions::set_ctype(::google::protobuf::FieldOptions_CType value) {
-  assert(::google::protobuf::FieldOptions_CType_IsValid(value));
-  set_has_ctype();
-  ctype_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.ctype)
-}
-
-// optional bool packed = 2;
-bool FieldOptions::has_packed() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void FieldOptions::set_has_packed() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void FieldOptions::clear_has_packed() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void FieldOptions::clear_packed() {
-  packed_ = false;
-  clear_has_packed();
-}
-bool FieldOptions::packed() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.packed)
-  return packed_;
-}
-void FieldOptions::set_packed(bool value) {
-  set_has_packed();
-  packed_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.packed)
-}
-
-// optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
-bool FieldOptions::has_jstype() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void FieldOptions::set_has_jstype() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void FieldOptions::clear_has_jstype() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void FieldOptions::clear_jstype() {
-  jstype_ = 0;
-  clear_has_jstype();
-}
-::google::protobuf::FieldOptions_JSType FieldOptions::jstype() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.jstype)
-  return static_cast< ::google::protobuf::FieldOptions_JSType >(jstype_);
-}
-void FieldOptions::set_jstype(::google::protobuf::FieldOptions_JSType value) {
-  assert(::google::protobuf::FieldOptions_JSType_IsValid(value));
-  set_has_jstype();
-  jstype_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.jstype)
-}
-
-// optional bool lazy = 5 [default = false];
-bool FieldOptions::has_lazy() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void FieldOptions::set_has_lazy() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void FieldOptions::clear_has_lazy() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void FieldOptions::clear_lazy() {
-  lazy_ = false;
-  clear_has_lazy();
-}
-bool FieldOptions::lazy() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.lazy)
-  return lazy_;
-}
-void FieldOptions::set_lazy(bool value) {
-  set_has_lazy();
-  lazy_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.lazy)
-}
-
-// optional bool deprecated = 3 [default = false];
-bool FieldOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void FieldOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void FieldOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void FieldOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool FieldOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.deprecated)
-  return deprecated_;
-}
-void FieldOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.deprecated)
-}
-
-// optional bool weak = 10 [default = false];
-bool FieldOptions::has_weak() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
-}
-void FieldOptions::set_has_weak() {
-  _has_bits_[0] |= 0x00000020u;
-}
-void FieldOptions::clear_has_weak() {
-  _has_bits_[0] &= ~0x00000020u;
-}
-void FieldOptions::clear_weak() {
-  weak_ = false;
-  clear_has_weak();
-}
-bool FieldOptions::weak() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.weak)
-  return weak_;
-}
-void FieldOptions::set_weak(bool value) {
-  set_has_weak();
-  weak_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldOptions.weak)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int FieldOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void FieldOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& FieldOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* FieldOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* FieldOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-FieldOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FieldOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-FieldOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_;
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void OneofOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int OneofOptions::kUninterpretedOptionFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 OneofOptions::OneofOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.OneofOptions)
 }
+OneofOptions::OneofOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.OneofOptions)
+}
 OneofOptions::OneofOptions(const OneofOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
@@ -10863,7 +9833,6 @@ OneofOptions::OneofOptions(const OneofOptions& from)
 }
 
 void OneofOptions::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 OneofOptions::~OneofOptions() {
@@ -10872,33 +9841,35 @@ OneofOptions::~OneofOptions() {
 }
 
 void OneofOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void OneofOptions::ArenaDtor(void* object) {
+  OneofOptions* _this = reinterpret_cast< OneofOptions* >(object);
+  (void)_this;
+}
+void OneofOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void OneofOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* OneofOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[14].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const OneofOptions& OneofOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_OneofOptions.base);
   return *internal_default_instance();
 }
 
-OneofOptions* OneofOptions::New(::google::protobuf::Arena* arena) const {
-  OneofOptions* n = new OneofOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void OneofOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.OneofOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
   _has_bits_.Clear();
@@ -10911,38 +9882,35 @@ bool OneofOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.OneofOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -10959,10 +9927,16 @@ failure:
 void OneofOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.OneofOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -10971,20 +9945,24 @@ void OneofOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.OneofOptions)
 }
 
 ::google::protobuf::uint8* OneofOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.OneofOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -10993,7 +9971,7 @@ void OneofOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.OneofOptions)
   return target;
@@ -11008,23 +9986,21 @@ size_t OneofOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -11048,6 +10024,9 @@ void OneofOptions::MergeFrom(const OneofOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
 }
 
@@ -11076,58 +10055,41 @@ bool OneofOptions::IsInitialized() const {
 
 void OneofOptions::Swap(OneofOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    OneofOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void OneofOptions::UnsafeArenaSwap(OneofOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void OneofOptions::InternalSwap(OneofOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata OneofOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[14];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// OneofOptions
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int OneofOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void OneofOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& OneofOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* OneofOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* OneofOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-OneofOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.OneofOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-OneofOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_;
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void EnumOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int EnumOptions::kAllowAliasFieldNumber;
 const int EnumOptions::kDeprecatedFieldNumber;
@@ -11136,30 +10098,38 @@ const int EnumOptions::kUninterpretedOptionFieldNumber;
 
 EnumOptions::EnumOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.EnumOptions)
 }
+EnumOptions::EnumOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumOptions)
+}
 EnumOptions::EnumOptions(const EnumOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
   ::memcpy(&allow_alias_, &from.allow_alias_,
-    reinterpret_cast<char*>(&deprecated_) -
-    reinterpret_cast<char*>(&allow_alias_) + sizeof(deprecated_));
+    static_cast<size_t>(reinterpret_cast<char*>(&deprecated_) -
+    reinterpret_cast<char*>(&allow_alias_)) + sizeof(deprecated_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.EnumOptions)
 }
 
 void EnumOptions::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&allow_alias_, 0, reinterpret_cast<char*>(&deprecated_) -
-    reinterpret_cast<char*>(&allow_alias_) + sizeof(deprecated_));
+  ::memset(&allow_alias_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&deprecated_) -
+      reinterpret_cast<char*>(&allow_alias_)) + sizeof(deprecated_));
 }
 
 EnumOptions::~EnumOptions() {
@@ -11168,39 +10138,40 @@ EnumOptions::~EnumOptions() {
 }
 
 void EnumOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void EnumOptions::ArenaDtor(void* object) {
+  EnumOptions* _this = reinterpret_cast< EnumOptions* >(object);
+  (void)_this;
+}
+void EnumOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void EnumOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* EnumOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[15].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const EnumOptions& EnumOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumOptions.base);
   return *internal_default_instance();
 }
 
-EnumOptions* EnumOptions::New(::google::protobuf::Arena* arena) const {
-  EnumOptions* n = new EnumOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void EnumOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.EnumOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    ::memset(&allow_alias_, 0, reinterpret_cast<char*>(&deprecated_) -
-      reinterpret_cast<char*>(&allow_alias_) + sizeof(deprecated_));
-  }
+  ::memset(&allow_alias_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&deprecated_) -
+      reinterpret_cast<char*>(&allow_alias_)) + sizeof(deprecated_));
   _has_bits_.Clear();
   _internal_metadata_.Clear();
 }
@@ -11211,14 +10182,14 @@ bool EnumOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.EnumOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional bool allow_alias = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_allow_alias();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -11232,7 +10203,7 @@ bool EnumOptions::MergePartialFromCodedStream(
       // optional bool deprecated = 3 [default = false];
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -11246,31 +10217,28 @@ bool EnumOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -11287,20 +10255,27 @@ failure:
 void EnumOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.EnumOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool allow_alias = 2;
-  if (has_allow_alias()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(2, this->allow_alias(), output);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(3, this->deprecated(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -11309,30 +10284,35 @@ void EnumOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.EnumOptions)
 }
 
 ::google::protobuf::uint8* EnumOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool allow_alias = 2;
-  if (has_allow_alias()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(2, this->allow_alias(), target);
   }
 
   // optional bool deprecated = 3 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(3, this->deprecated(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -11341,7 +10321,7 @@ void EnumOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumOptions)
   return target;
@@ -11356,16 +10336,16 @@ size_t EnumOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -11382,9 +10362,7 @@ size_t EnumOptions::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -11408,14 +10386,19 @@ void EnumOptions::MergeFrom(const EnumOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_allow_alias()) {
-      set_allow_alias(from.allow_alias());
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      allow_alias_ = from.allow_alias_;
     }
-    if (from.has_deprecated()) {
-      set_deprecated(from.deprecated());
+    if (cached_has_bits & 0x00000002u) {
+      deprecated_ = from.deprecated_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -11444,108 +10427,43 @@ bool EnumOptions::IsInitialized() const {
 
 void EnumOptions::Swap(EnumOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    EnumOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void EnumOptions::UnsafeArenaSwap(EnumOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void EnumOptions::InternalSwap(EnumOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(allow_alias_, other->allow_alias_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(allow_alias_, other->allow_alias_);
+  swap(deprecated_, other->deprecated_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata EnumOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[15];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// EnumOptions
-
-// optional bool allow_alias = 2;
-bool EnumOptions::has_allow_alias() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void EnumOptions::set_has_allow_alias() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void EnumOptions::clear_has_allow_alias() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void EnumOptions::clear_allow_alias() {
-  allow_alias_ = false;
-  clear_has_allow_alias();
-}
-bool EnumOptions::allow_alias() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumOptions.allow_alias)
-  return allow_alias_;
-}
-void EnumOptions::set_allow_alias(bool value) {
-  set_has_allow_alias();
-  allow_alias_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumOptions.allow_alias)
-}
-
-// optional bool deprecated = 3 [default = false];
-bool EnumOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void EnumOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void EnumOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void EnumOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool EnumOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumOptions.deprecated)
-  return deprecated_;
-}
-void EnumOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumOptions.deprecated)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int EnumOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void EnumOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& EnumOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* EnumOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* EnumOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-EnumOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-EnumOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_;
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void EnumValueOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int EnumValueOptions::kDeprecatedFieldNumber;
 const int EnumValueOptions::kUninterpretedOptionFieldNumber;
@@ -11553,17 +10471,25 @@ const int EnumValueOptions::kUninterpretedOptionFieldNumber;
 
 EnumValueOptions::EnumValueOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.EnumValueOptions)
 }
+EnumValueOptions::EnumValueOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumValueOptions)
+}
 EnumValueOptions::EnumValueOptions(const EnumValueOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
@@ -11572,7 +10498,6 @@ EnumValueOptions::EnumValueOptions(const EnumValueOptions& from)
 }
 
 void EnumValueOptions::SharedCtor() {
-  _cached_size_ = 0;
   deprecated_ = false;
 }
 
@@ -11582,33 +10507,35 @@ EnumValueOptions::~EnumValueOptions() {
 }
 
 void EnumValueOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void EnumValueOptions::ArenaDtor(void* object) {
+  EnumValueOptions* _this = reinterpret_cast< EnumValueOptions* >(object);
+  (void)_this;
+}
+void EnumValueOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void EnumValueOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* EnumValueOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[16].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const EnumValueOptions& EnumValueOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_EnumValueOptions.base);
   return *internal_default_instance();
 }
 
-EnumValueOptions* EnumValueOptions::New(::google::protobuf::Arena* arena) const {
-  EnumValueOptions* n = new EnumValueOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void EnumValueOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.EnumValueOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
   deprecated_ = false;
@@ -11622,14 +10549,14 @@ bool EnumValueOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.EnumValueOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional bool deprecated = 1 [default = false];
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -11643,31 +10570,28 @@ bool EnumValueOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -11684,15 +10608,22 @@ failure:
 void EnumValueOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.EnumValueOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 1 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(1, this->deprecated(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -11701,25 +10632,30 @@ void EnumValueOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.EnumValueOptions)
 }
 
 ::google::protobuf::uint8* EnumValueOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumValueOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 1 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(1, this->deprecated(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -11728,7 +10664,7 @@ void EnumValueOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumValueOptions)
   return target;
@@ -11743,16 +10679,16 @@ size_t EnumValueOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -11762,9 +10698,7 @@ size_t EnumValueOptions::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -11788,6 +10722,9 @@ void EnumValueOptions::MergeFrom(const EnumValueOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
   if (from.has_deprecated()) {
     set_deprecated(from.deprecated());
@@ -11819,83 +10756,42 @@ bool EnumValueOptions::IsInitialized() const {
 
 void EnumValueOptions::Swap(EnumValueOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    EnumValueOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void EnumValueOptions::UnsafeArenaSwap(EnumValueOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void EnumValueOptions::InternalSwap(EnumValueOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(deprecated_, other->deprecated_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata EnumValueOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[16];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// EnumValueOptions
-
-// optional bool deprecated = 1 [default = false];
-bool EnumValueOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void EnumValueOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void EnumValueOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void EnumValueOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool EnumValueOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueOptions.deprecated)
-  return deprecated_;
-}
-void EnumValueOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumValueOptions.deprecated)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int EnumValueOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void EnumValueOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& EnumValueOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* EnumValueOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* EnumValueOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-EnumValueOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-EnumValueOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void ServiceOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int ServiceOptions::kDeprecatedFieldNumber;
 const int ServiceOptions::kUninterpretedOptionFieldNumber;
@@ -11903,17 +10799,25 @@ const int ServiceOptions::kUninterpretedOptionFieldNumber;
 
 ServiceOptions::ServiceOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.ServiceOptions)
 }
+ServiceOptions::ServiceOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.ServiceOptions)
+}
 ServiceOptions::ServiceOptions(const ServiceOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
@@ -11922,7 +10826,6 @@ ServiceOptions::ServiceOptions(const ServiceOptions& from)
 }
 
 void ServiceOptions::SharedCtor() {
-  _cached_size_ = 0;
   deprecated_ = false;
 }
 
@@ -11932,33 +10835,35 @@ ServiceOptions::~ServiceOptions() {
 }
 
 void ServiceOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void ServiceOptions::ArenaDtor(void* object) {
+  ServiceOptions* _this = reinterpret_cast< ServiceOptions* >(object);
+  (void)_this;
+}
+void ServiceOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void ServiceOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* ServiceOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[17].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const ServiceOptions& ServiceOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_ServiceOptions.base);
   return *internal_default_instance();
 }
 
-ServiceOptions* ServiceOptions::New(::google::protobuf::Arena* arena) const {
-  ServiceOptions* n = new ServiceOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void ServiceOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.ServiceOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
   deprecated_ = false;
@@ -11972,14 +10877,14 @@ bool ServiceOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.ServiceOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional bool deprecated = 33 [default = false];
       case 33: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(264u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 264 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -11993,31 +10898,28 @@ bool ServiceOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -12034,15 +10936,22 @@ failure:
 void ServiceOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.ServiceOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 33 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(33, this->deprecated(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -12051,25 +10960,30 @@ void ServiceOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.ServiceOptions)
 }
 
 ::google::protobuf::uint8* ServiceOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.ServiceOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 33 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(33, this->deprecated(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -12078,7 +10992,7 @@ void ServiceOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.ServiceOptions)
   return target;
@@ -12093,16 +11007,16 @@ size_t ServiceOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -12112,9 +11026,7 @@ size_t ServiceOptions::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -12138,6 +11050,9 @@ void ServiceOptions::MergeFrom(const ServiceOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
   if (from.has_deprecated()) {
     set_deprecated(from.deprecated());
@@ -12169,83 +11084,42 @@ bool ServiceOptions::IsInitialized() const {
 
 void ServiceOptions::Swap(ServiceOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    ServiceOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void ServiceOptions::UnsafeArenaSwap(ServiceOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void ServiceOptions::InternalSwap(ServiceOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(deprecated_, other->deprecated_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata ServiceOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[17];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// ServiceOptions
-
-// optional bool deprecated = 33 [default = false];
-bool ServiceOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void ServiceOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void ServiceOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void ServiceOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool ServiceOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceOptions.deprecated)
-  return deprecated_;
-}
-void ServiceOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.ServiceOptions.deprecated)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int ServiceOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void ServiceOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& ServiceOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* ServiceOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* ServiceOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-ServiceOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.ServiceOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-ServiceOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void MethodOptions::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int MethodOptions::kDeprecatedFieldNumber;
 const int MethodOptions::kIdempotencyLevelFieldNumber;
@@ -12254,30 +11128,38 @@ const int MethodOptions::kUninterpretedOptionFieldNumber;
 
 MethodOptions::MethodOptions()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodOptions.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.MethodOptions)
 }
+MethodOptions::MethodOptions(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _extensions_(arena),
+  _internal_metadata_(arena),
+  uninterpreted_option_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodOptions.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.MethodOptions)
+}
 MethodOptions::MethodOptions(const MethodOptions& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       uninterpreted_option_(from.uninterpreted_option_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   _extensions_.MergeFrom(from._extensions_);
   ::memcpy(&deprecated_, &from.deprecated_,
-    reinterpret_cast<char*>(&idempotency_level_) -
-    reinterpret_cast<char*>(&deprecated_) + sizeof(idempotency_level_));
+    static_cast<size_t>(reinterpret_cast<char*>(&idempotency_level_) -
+    reinterpret_cast<char*>(&deprecated_)) + sizeof(idempotency_level_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.MethodOptions)
 }
 
 void MethodOptions::SharedCtor() {
-  _cached_size_ = 0;
-  ::memset(&deprecated_, 0, reinterpret_cast<char*>(&idempotency_level_) -
-    reinterpret_cast<char*>(&deprecated_) + sizeof(idempotency_level_));
+  ::memset(&deprecated_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&idempotency_level_) -
+      reinterpret_cast<char*>(&deprecated_)) + sizeof(idempotency_level_));
 }
 
 MethodOptions::~MethodOptions() {
@@ -12286,38 +11168,42 @@ MethodOptions::~MethodOptions() {
 }
 
 void MethodOptions::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void MethodOptions::ArenaDtor(void* object) {
+  MethodOptions* _this = reinterpret_cast< MethodOptions* >(object);
+  (void)_this;
+}
+void MethodOptions::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void MethodOptions::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* MethodOptions::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[18].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const MethodOptions& MethodOptions::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_MethodOptions.base);
   return *internal_default_instance();
 }
 
-MethodOptions* MethodOptions::New(::google::protobuf::Arena* arena) const {
-  MethodOptions* n = new MethodOptions;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void MethodOptions::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.MethodOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   _extensions_.Clear();
   uninterpreted_option_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    ::memset(&deprecated_, 0, reinterpret_cast<char*>(&idempotency_level_) -
-      reinterpret_cast<char*>(&deprecated_) + sizeof(idempotency_level_));
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    ::memset(&deprecated_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&idempotency_level_) -
+        reinterpret_cast<char*>(&deprecated_)) + sizeof(idempotency_level_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -12329,14 +11215,14 @@ bool MethodOptions::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.MethodOptions)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(16383u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // optional bool deprecated = 33 [default = false];
       case 33: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(264u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 264 & 0xFF */)) {
           set_has_deprecated();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -12350,7 +11236,7 @@ bool MethodOptions::MergePartialFromCodedStream(
       // optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];
       case 34: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(272u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 272 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -12358,7 +11244,8 @@ bool MethodOptions::MergePartialFromCodedStream(
           if (::google::protobuf::MethodOptions_IdempotencyLevel_IsValid(value)) {
             set_idempotency_level(static_cast< ::google::protobuf::MethodOptions_IdempotencyLevel >(value));
           } else {
-            mutable_unknown_fields()->AddVarint(34, value);
+            mutable_unknown_fields()->AddVarint(
+                34, static_cast< ::google::protobuf::uint64>(value));
           }
         } else {
           goto handle_unusual;
@@ -12369,31 +11256,28 @@ bool MethodOptions::MergePartialFromCodedStream(
       // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
       case 999: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(7994u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(58u /* 7994 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_uninterpreted_option()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         if ((8000u <= tag)) {
-          DO_(_extensions_.ParseField(tag, input, internal_default_instance(),
-                                      mutable_unknown_fields()));
+          DO_(_extensions_.ParseField(tag, input,
+              internal_default_instance(),
+              _internal_metadata_.mutable_unknown_fields()));
           continue;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -12410,21 +11294,28 @@ failure:
 void MethodOptions::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.MethodOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 33 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(33, this->deprecated(), output);
   }
 
   // optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];
-  if (has_idempotency_level()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
       34, this->idempotency_level(), output);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      999, this->uninterpreted_option(i), output);
+      999,
+      this->uninterpreted_option(static_cast<int>(i)),
+      output);
   }
 
   // Extension range [1000, 536870912)
@@ -12433,31 +11324,36 @@ void MethodOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.MethodOptions)
 }
 
 ::google::protobuf::uint8* MethodOptions::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.MethodOptions)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // optional bool deprecated = 33 [default = false];
-  if (has_deprecated()) {
+  if (cached_has_bits & 0x00000001u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(33, this->deprecated(), target);
   }
 
   // optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];
-  if (has_idempotency_level()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
       34, this->idempotency_level(), target);
   }
 
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-  for (unsigned int i = 0, n = this->uninterpreted_option_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->uninterpreted_option_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        999, this->uninterpreted_option(i), false, target);
+      InternalWriteMessageToArray(
+        999, this->uninterpreted_option(static_cast<int>(i)), deterministic, target);
   }
 
   // Extension range [1000, 536870912)
@@ -12466,7 +11362,7 @@ void MethodOptions::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.MethodOptions)
   return target;
@@ -12481,16 +11377,16 @@ size_t MethodOptions::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
   {
-    unsigned int count = this->uninterpreted_option_size();
+    unsigned int count = static_cast<unsigned int>(this->uninterpreted_option_size());
     total_size += 2UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->uninterpreted_option(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->uninterpreted_option(static_cast<int>(i)));
     }
   }
 
@@ -12508,9 +11404,7 @@ size_t MethodOptions::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -12534,14 +11428,19 @@ void MethodOptions::MergeFrom(const MethodOptions& from) {
   GOOGLE_DCHECK_NE(&from, this);
   _extensions_.MergeFrom(from._extensions_);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   uninterpreted_option_.MergeFrom(from.uninterpreted_option_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_deprecated()) {
-      set_deprecated(from.deprecated());
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      deprecated_ = from.deprecated_;
     }
-    if (from.has_idempotency_level()) {
-      set_idempotency_level(from.idempotency_level());
+    if (cached_has_bits & 0x00000002u) {
+      idempotency_level_ = from.idempotency_level_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -12570,109 +11469,43 @@ bool MethodOptions::IsInitialized() const {
 
 void MethodOptions::Swap(MethodOptions* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    MethodOptions* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void MethodOptions::UnsafeArenaSwap(MethodOptions* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void MethodOptions::InternalSwap(MethodOptions* other) {
-  uninterpreted_option_.UnsafeArenaSwap(&other->uninterpreted_option_);
-  std::swap(deprecated_, other->deprecated_);
-  std::swap(idempotency_level_, other->idempotency_level_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&uninterpreted_option_)->InternalSwap(CastToBase(&other->uninterpreted_option_));
+  swap(deprecated_, other->deprecated_);
+  swap(idempotency_level_, other->idempotency_level_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
   _extensions_.Swap(&other->_extensions_);
 }
 
 ::google::protobuf::Metadata MethodOptions::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[18];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// MethodOptions
-
-// optional bool deprecated = 33 [default = false];
-bool MethodOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void MethodOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void MethodOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void MethodOptions::clear_deprecated() {
-  deprecated_ = false;
-  clear_has_deprecated();
-}
-bool MethodOptions::deprecated() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodOptions.deprecated)
-  return deprecated_;
-}
-void MethodOptions::set_deprecated(bool value) {
-  set_has_deprecated();
-  deprecated_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodOptions.deprecated)
-}
-
-// optional .google.protobuf.MethodOptions.IdempotencyLevel idempotency_level = 34 [default = IDEMPOTENCY_UNKNOWN];
-bool MethodOptions::has_idempotency_level() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void MethodOptions::set_has_idempotency_level() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void MethodOptions::clear_has_idempotency_level() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void MethodOptions::clear_idempotency_level() {
-  idempotency_level_ = 0;
-  clear_has_idempotency_level();
-}
-::google::protobuf::MethodOptions_IdempotencyLevel MethodOptions::idempotency_level() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodOptions.idempotency_level)
-  return static_cast< ::google::protobuf::MethodOptions_IdempotencyLevel >(idempotency_level_);
-}
-void MethodOptions::set_idempotency_level(::google::protobuf::MethodOptions_IdempotencyLevel value) {
-  assert(::google::protobuf::MethodOptions_IdempotencyLevel_IsValid(value));
-  set_has_idempotency_level();
-  idempotency_level_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.MethodOptions.idempotency_level)
-}
-
-// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
-int MethodOptions::uninterpreted_option_size() const {
-  return uninterpreted_option_.size();
-}
-void MethodOptions::clear_uninterpreted_option() {
-  uninterpreted_option_.Clear();
-}
-const ::google::protobuf::UninterpretedOption& MethodOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
-::google::protobuf::UninterpretedOption* MethodOptions::mutable_uninterpreted_option(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption* MethodOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
-MethodOptions::mutable_uninterpreted_option() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.MethodOptions.uninterpreted_option)
-  return &uninterpreted_option_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
-MethodOptions::uninterpreted_option() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void UninterpretedOption_NamePart::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int UninterpretedOption_NamePart::kNamePartFieldNumber;
 const int UninterpretedOption_NamePart::kIsExtensionFieldNumber;
@@ -12680,28 +11513,34 @@ const int UninterpretedOption_NamePart::kIsExtensionFieldNumber;
 
 UninterpretedOption_NamePart::UninterpretedOption_NamePart()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption_NamePart.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.UninterpretedOption.NamePart)
 }
+UninterpretedOption_NamePart::UninterpretedOption_NamePart(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption_NamePart.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.UninterpretedOption.NamePart)
+}
 UninterpretedOption_NamePart::UninterpretedOption_NamePart(const UninterpretedOption_NamePart& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      _has_bits_(from._has_bits_),
-      _cached_size_(0) {
+      _has_bits_(from._has_bits_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_part_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_name_part()) {
-    name_part_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_part_);
+    name_part_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_part(),
+      GetArenaNoVirtual());
   }
   is_extension_ = from.is_extension_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.UninterpretedOption.NamePart)
 }
 
 void UninterpretedOption_NamePart::SharedCtor() {
-  _cached_size_ = 0;
   name_part_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   is_extension_ = false;
 }
@@ -12712,37 +11551,39 @@ UninterpretedOption_NamePart::~UninterpretedOption_NamePart() {
 }
 
 void UninterpretedOption_NamePart::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   name_part_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
+void UninterpretedOption_NamePart::ArenaDtor(void* object) {
+  UninterpretedOption_NamePart* _this = reinterpret_cast< UninterpretedOption_NamePart* >(object);
+  (void)_this;
+}
+void UninterpretedOption_NamePart::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void UninterpretedOption_NamePart::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* UninterpretedOption_NamePart::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[19].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const UninterpretedOption_NamePart& UninterpretedOption_NamePart::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption_NamePart.base);
   return *internal_default_instance();
 }
 
-UninterpretedOption_NamePart* UninterpretedOption_NamePart::New(::google::protobuf::Arena* arena) const {
-  UninterpretedOption_NamePart* n = new UninterpretedOption_NamePart;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void UninterpretedOption_NamePart::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.UninterpretedOption.NamePart)
-  if (has_name_part()) {
-    GOOGLE_DCHECK(!name_part_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-    (*name_part_.UnsafeRawStringPointer())->clear();
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 0x00000001u) {
+    name_part_.ClearNonDefaultToEmpty();
   }
   is_extension_ = false;
   _has_bits_.Clear();
@@ -12755,18 +11596,18 @@ bool UninterpretedOption_NamePart::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.UninterpretedOption.NamePart)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // required string name_part = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name_part()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->name_part().data(), this->name_part().length(),
+            this->name_part().data(), static_cast<int>(this->name_part().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.UninterpretedOption.NamePart.name_part");
         } else {
@@ -12778,7 +11619,7 @@ bool UninterpretedOption_NamePart::MergePartialFromCodedStream(
       // required bool is_extension = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           set_has_is_extension();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -12791,13 +11632,11 @@ bool UninterpretedOption_NamePart::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -12814,10 +11653,14 @@ failure:
 void UninterpretedOption_NamePart::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.UninterpretedOption.NamePart)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // required string name_part = 1;
-  if (has_name_part()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name_part().data(), this->name_part().length(),
+      this->name_part().data(), static_cast<int>(this->name_part().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.NamePart.name_part");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -12825,25 +11668,29 @@ void UninterpretedOption_NamePart::SerializeWithCachedSizes(
   }
 
   // required bool is_extension = 2;
-  if (has_is_extension()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(2, this->is_extension(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.UninterpretedOption.NamePart)
 }
 
 ::google::protobuf::uint8* UninterpretedOption_NamePart::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.UninterpretedOption.NamePart)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = _has_bits_[0];
   // required string name_part = 1;
-  if (has_name_part()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->name_part().data(), this->name_part().length(),
+      this->name_part().data(), static_cast<int>(this->name_part().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.NamePart.name_part");
     target =
@@ -12852,13 +11699,13 @@ void UninterpretedOption_NamePart::SerializeWithCachedSizes(
   }
 
   // required bool is_extension = 2;
-  if (has_is_extension()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(2, this->is_extension(), target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.UninterpretedOption.NamePart)
   return target;
@@ -12889,7 +11736,7 @@ size_t UninterpretedOption_NamePart::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   if (((_has_bits_[0] & 0x00000003) ^ 0x00000003) == 0) {  // All required fields are present.
     // required string name_part = 1;
@@ -12904,9 +11751,7 @@ size_t UninterpretedOption_NamePart::ByteSizeLong() const {
     total_size += RequiredFieldsByteSizeFallback();
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -12929,14 +11774,18 @@ void UninterpretedOption_NamePart::MergeFrom(const UninterpretedOption_NamePart&
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.UninterpretedOption.NamePart)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_name_part()) {
-      set_has_name_part();
-      name_part_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.name_part_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_name_part(from.name_part());
     }
-    if (from.has_is_extension()) {
-      set_is_extension(from.is_extension());
+    if (cached_has_bits & 0x00000002u) {
+      is_extension_ = from.is_extension_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -12961,114 +11810,42 @@ bool UninterpretedOption_NamePart::IsInitialized() const {
 
 void UninterpretedOption_NamePart::Swap(UninterpretedOption_NamePart* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    UninterpretedOption_NamePart* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void UninterpretedOption_NamePart::UnsafeArenaSwap(UninterpretedOption_NamePart* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void UninterpretedOption_NamePart::InternalSwap(UninterpretedOption_NamePart* other) {
-  name_part_.Swap(&other->name_part_);
-  std::swap(is_extension_, other->is_extension_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  name_part_.Swap(&other->name_part_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(is_extension_, other->is_extension_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata UninterpretedOption_NamePart::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[19];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// UninterpretedOption_NamePart
-
-// required string name_part = 1;
-bool UninterpretedOption_NamePart::has_name_part() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void UninterpretedOption_NamePart::set_has_name_part() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void UninterpretedOption_NamePart::clear_has_name_part() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void UninterpretedOption_NamePart::clear_name_part() {
-  name_part_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_name_part();
-}
-const ::std::string& UninterpretedOption_NamePart::name_part() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.NamePart.name_part)
-  return name_part_.GetNoArena();
-}
-void UninterpretedOption_NamePart::set_name_part(const ::std::string& value) {
-  set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.NamePart.name_part)
-}
-#if LANG_CXX11
-void UninterpretedOption_NamePart::set_name_part(::std::string&& value) {
-  set_has_name_part();
-  name_part_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.NamePart.name_part)
-}
-#endif
-void UninterpretedOption_NamePart::set_name_part(const char* value) {
-  set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.NamePart.name_part)
-}
-void UninterpretedOption_NamePart::set_name_part(const char* value, size_t size) {
-  set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.NamePart.name_part)
-}
-::std::string* UninterpretedOption_NamePart::mutable_name_part() {
-  set_has_name_part();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.NamePart.name_part)
-  return name_part_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* UninterpretedOption_NamePart::release_name_part() {
-  // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.NamePart.name_part)
-  clear_has_name_part();
-  return name_part_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void UninterpretedOption_NamePart::set_allocated_name_part(::std::string* name_part) {
-  if (name_part != NULL) {
-    set_has_name_part();
-  } else {
-    clear_has_name_part();
-  }
-  name_part_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name_part);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.NamePart.name_part)
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// required bool is_extension = 2;
-bool UninterpretedOption_NamePart::has_is_extension() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void UninterpretedOption_NamePart::set_has_is_extension() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void UninterpretedOption_NamePart::clear_has_is_extension() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void UninterpretedOption_NamePart::clear_is_extension() {
-  is_extension_ = false;
-  clear_has_is_extension();
-}
-bool UninterpretedOption_NamePart::is_extension() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.NamePart.is_extension)
-  return is_extension_;
-}
-void UninterpretedOption_NamePart::set_is_extension(bool value) {
-  set_has_is_extension();
-  is_extension_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.NamePart.is_extension)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void UninterpretedOption::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int UninterpretedOption::kNameFieldNumber;
 const int UninterpretedOption::kIdentifierValueFieldNumber;
@@ -13081,44 +11858,54 @@ const int UninterpretedOption::kAggregateValueFieldNumber;
 
 UninterpretedOption::UninterpretedOption()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.UninterpretedOption)
 }
+UninterpretedOption::UninterpretedOption(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  name_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.UninterpretedOption)
+}
 UninterpretedOption::UninterpretedOption(const UninterpretedOption& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       name_(from.name_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   identifier_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_identifier_value()) {
-    identifier_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.identifier_value_);
+    identifier_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.identifier_value(),
+      GetArenaNoVirtual());
   }
   string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_string_value()) {
-    string_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.string_value_);
+    string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.string_value(),
+      GetArenaNoVirtual());
   }
   aggregate_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_aggregate_value()) {
-    aggregate_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.aggregate_value_);
+    aggregate_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.aggregate_value(),
+      GetArenaNoVirtual());
   }
   ::memcpy(&positive_int_value_, &from.positive_int_value_,
-    reinterpret_cast<char*>(&double_value_) -
-    reinterpret_cast<char*>(&positive_int_value_) + sizeof(double_value_));
+    static_cast<size_t>(reinterpret_cast<char*>(&double_value_) -
+    reinterpret_cast<char*>(&positive_int_value_)) + sizeof(double_value_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.UninterpretedOption)
 }
 
 void UninterpretedOption::SharedCtor() {
-  _cached_size_ = 0;
   identifier_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   aggregate_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&positive_int_value_, 0, reinterpret_cast<char*>(&double_value_) -
-    reinterpret_cast<char*>(&positive_int_value_) + sizeof(double_value_));
+  ::memset(&positive_int_value_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&double_value_) -
+      reinterpret_cast<char*>(&positive_int_value_)) + sizeof(double_value_));
 }
 
 UninterpretedOption::~UninterpretedOption() {
@@ -13127,54 +11914,55 @@ UninterpretedOption::~UninterpretedOption() {
 }
 
 void UninterpretedOption::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   identifier_value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   string_value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   aggregate_value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
+void UninterpretedOption::ArenaDtor(void* object) {
+  UninterpretedOption* _this = reinterpret_cast< UninterpretedOption* >(object);
+  (void)_this;
+}
+void UninterpretedOption::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void UninterpretedOption::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* UninterpretedOption::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[20].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const UninterpretedOption& UninterpretedOption::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_UninterpretedOption.base);
   return *internal_default_instance();
 }
 
-UninterpretedOption* UninterpretedOption::New(::google::protobuf::Arena* arena) const {
-  UninterpretedOption* n = new UninterpretedOption;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void UninterpretedOption::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.UninterpretedOption)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   name_.Clear();
-  if (_has_bits_[0 / 32] & 7u) {
-    if (has_identifier_value()) {
-      GOOGLE_DCHECK(!identifier_value_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*identifier_value_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
+      identifier_value_.ClearNonDefaultToEmpty();
     }
-    if (has_string_value()) {
-      GOOGLE_DCHECK(!string_value_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*string_value_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      string_value_.ClearNonDefaultToEmpty();
     }
-    if (has_aggregate_value()) {
-      GOOGLE_DCHECK(!aggregate_value_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*aggregate_value_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000004u) {
+      aggregate_value_.ClearNonDefaultToEmpty();
     }
   }
-  if (_has_bits_[0 / 32] & 56u) {
-    ::memset(&positive_int_value_, 0, reinterpret_cast<char*>(&double_value_) -
-      reinterpret_cast<char*>(&positive_int_value_) + sizeof(double_value_));
+  if (cached_has_bits & 56u) {
+    ::memset(&positive_int_value_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&double_value_) -
+        reinterpret_cast<char*>(&positive_int_value_)) + sizeof(double_value_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -13186,32 +11974,30 @@ bool UninterpretedOption::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.UninterpretedOption)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.UninterpretedOption.NamePart name = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_name()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // optional string identifier_value = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_identifier_value()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->identifier_value().data(), this->identifier_value().length(),
+            this->identifier_value().data(), static_cast<int>(this->identifier_value().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.UninterpretedOption.identifier_value");
         } else {
@@ -13223,7 +12009,7 @@ bool UninterpretedOption::MergePartialFromCodedStream(
       // optional uint64 positive_int_value = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(32u)) {
+            static_cast< ::google::protobuf::uint8>(32u /* 32 & 0xFF */)) {
           set_has_positive_int_value();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::uint64, ::google::protobuf::internal::WireFormatLite::TYPE_UINT64>(
@@ -13237,7 +12023,7 @@ bool UninterpretedOption::MergePartialFromCodedStream(
       // optional int64 negative_int_value = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
           set_has_negative_int_value();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int64, ::google::protobuf::internal::WireFormatLite::TYPE_INT64>(
@@ -13251,7 +12037,7 @@ bool UninterpretedOption::MergePartialFromCodedStream(
       // optional double double_value = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(49u)) {
+            static_cast< ::google::protobuf::uint8>(49u /* 49 & 0xFF */)) {
           set_has_double_value();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    double, ::google::protobuf::internal::WireFormatLite::TYPE_DOUBLE>(
@@ -13265,7 +12051,7 @@ bool UninterpretedOption::MergePartialFromCodedStream(
       // optional bytes string_value = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(58u)) {
+            static_cast< ::google::protobuf::uint8>(58u /* 58 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadBytes(
                 input, this->mutable_string_value()));
         } else {
@@ -13277,11 +12063,11 @@ bool UninterpretedOption::MergePartialFromCodedStream(
       // optional string aggregate_value = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(66u)) {
+            static_cast< ::google::protobuf::uint8>(66u /* 66 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_aggregate_value()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->aggregate_value().data(), this->aggregate_value().length(),
+            this->aggregate_value().data(), static_cast<int>(this->aggregate_value().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.UninterpretedOption.aggregate_value");
         } else {
@@ -13292,13 +12078,11 @@ bool UninterpretedOption::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -13315,16 +12099,23 @@ failure:
 void UninterpretedOption::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.UninterpretedOption)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.UninterpretedOption.NamePart name = 2;
-  for (unsigned int i = 0, n = this->name_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->name_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->name(i), output);
+      2,
+      this->name(static_cast<int>(i)),
+      output);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string identifier_value = 3;
-  if (has_identifier_value()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->identifier_value().data(), this->identifier_value().length(),
+      this->identifier_value().data(), static_cast<int>(this->identifier_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.identifier_value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -13332,30 +12123,30 @@ void UninterpretedOption::SerializeWithCachedSizes(
   }
 
   // optional uint64 positive_int_value = 4;
-  if (has_positive_int_value()) {
+  if (cached_has_bits & 0x00000008u) {
     ::google::protobuf::internal::WireFormatLite::WriteUInt64(4, this->positive_int_value(), output);
   }
 
   // optional int64 negative_int_value = 5;
-  if (has_negative_int_value()) {
+  if (cached_has_bits & 0x00000010u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt64(5, this->negative_int_value(), output);
   }
 
   // optional double double_value = 6;
-  if (has_double_value()) {
+  if (cached_has_bits & 0x00000020u) {
     ::google::protobuf::internal::WireFormatLite::WriteDouble(6, this->double_value(), output);
   }
 
   // optional bytes string_value = 7;
-  if (has_string_value()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteBytesMaybeAliased(
       7, this->string_value(), output);
   }
 
   // optional string aggregate_value = 8;
-  if (has_aggregate_value()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->aggregate_value().data(), this->aggregate_value().length(),
+      this->aggregate_value().data(), static_cast<int>(this->aggregate_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.aggregate_value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -13364,26 +12155,31 @@ void UninterpretedOption::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.UninterpretedOption)
 }
 
 ::google::protobuf::uint8* UninterpretedOption::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.UninterpretedOption)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.UninterpretedOption.NamePart name = 2;
-  for (unsigned int i = 0, n = this->name_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->name_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->name(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->name(static_cast<int>(i)), deterministic, target);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string identifier_value = 3;
-  if (has_identifier_value()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->identifier_value().data(), this->identifier_value().length(),
+      this->identifier_value().data(), static_cast<int>(this->identifier_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.identifier_value");
     target =
@@ -13392,31 +12188,31 @@ void UninterpretedOption::SerializeWithCachedSizes(
   }
 
   // optional uint64 positive_int_value = 4;
-  if (has_positive_int_value()) {
+  if (cached_has_bits & 0x00000008u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteUInt64ToArray(4, this->positive_int_value(), target);
   }
 
   // optional int64 negative_int_value = 5;
-  if (has_negative_int_value()) {
+  if (cached_has_bits & 0x00000010u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt64ToArray(5, this->negative_int_value(), target);
   }
 
   // optional double double_value = 6;
-  if (has_double_value()) {
+  if (cached_has_bits & 0x00000020u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteDoubleToArray(6, this->double_value(), target);
   }
 
   // optional bytes string_value = 7;
-  if (has_string_value()) {
+  if (cached_has_bits & 0x00000002u) {
     target =
       ::google::protobuf::internal::WireFormatLite::WriteBytesToArray(
         7, this->string_value(), target);
   }
 
   // optional string aggregate_value = 8;
-  if (has_aggregate_value()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->aggregate_value().data(), this->aggregate_value().length(),
+      this->aggregate_value().data(), static_cast<int>(this->aggregate_value().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.UninterpretedOption.aggregate_value");
     target =
@@ -13426,7 +12222,7 @@ void UninterpretedOption::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.UninterpretedOption)
   return target;
@@ -13439,16 +12235,16 @@ size_t UninterpretedOption::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.UninterpretedOption.NamePart name = 2;
   {
-    unsigned int count = this->name_size();
+    unsigned int count = static_cast<unsigned int>(this->name_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->name(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->name(static_cast<int>(i)));
     }
   }
 
@@ -13495,9 +12291,7 @@ size_t UninterpretedOption::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -13520,29 +12314,31 @@ void UninterpretedOption::MergeFrom(const UninterpretedOption& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.UninterpretedOption)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   name_.MergeFrom(from.name_);
-  if (from._has_bits_[0 / 32] & 63u) {
-    if (from.has_identifier_value()) {
-      set_has_identifier_value();
-      identifier_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.identifier_value_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 63u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_identifier_value(from.identifier_value());
     }
-    if (from.has_string_value()) {
-      set_has_string_value();
-      string_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.string_value_);
+    if (cached_has_bits & 0x00000002u) {
+      set_string_value(from.string_value());
     }
-    if (from.has_aggregate_value()) {
-      set_has_aggregate_value();
-      aggregate_value_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.aggregate_value_);
+    if (cached_has_bits & 0x00000004u) {
+      set_aggregate_value(from.aggregate_value());
     }
-    if (from.has_positive_int_value()) {
-      set_positive_int_value(from.positive_int_value());
+    if (cached_has_bits & 0x00000008u) {
+      positive_int_value_ = from.positive_int_value_;
     }
-    if (from.has_negative_int_value()) {
-      set_negative_int_value(from.negative_int_value());
+    if (cached_has_bits & 0x00000010u) {
+      negative_int_value_ = from.negative_int_value_;
     }
-    if (from.has_double_value()) {
-      set_double_value(from.double_value());
+    if (cached_has_bits & 0x00000020u) {
+      double_value_ = from.double_value_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -13567,321 +12363,49 @@ bool UninterpretedOption::IsInitialized() const {
 
 void UninterpretedOption::Swap(UninterpretedOption* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    UninterpretedOption* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void UninterpretedOption::UnsafeArenaSwap(UninterpretedOption* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void UninterpretedOption::InternalSwap(UninterpretedOption* other) {
-  name_.UnsafeArenaSwap(&other->name_);
-  identifier_value_.Swap(&other->identifier_value_);
-  string_value_.Swap(&other->string_value_);
-  aggregate_value_.Swap(&other->aggregate_value_);
-  std::swap(positive_int_value_, other->positive_int_value_);
-  std::swap(negative_int_value_, other->negative_int_value_);
-  std::swap(double_value_, other->double_value_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&name_)->InternalSwap(CastToBase(&other->name_));
+  identifier_value_.Swap(&other->identifier_value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  string_value_.Swap(&other->string_value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  aggregate_value_.Swap(&other->aggregate_value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(positive_int_value_, other->positive_int_value_);
+  swap(negative_int_value_, other->negative_int_value_);
+  swap(double_value_, other->double_value_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata UninterpretedOption::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[20];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// UninterpretedOption
-
-// repeated .google.protobuf.UninterpretedOption.NamePart name = 2;
-int UninterpretedOption::name_size() const {
-  return name_.size();
-}
-void UninterpretedOption::clear_name() {
-  name_.Clear();
-}
-const ::google::protobuf::UninterpretedOption_NamePart& UninterpretedOption::name(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.name)
-  return name_.Get(index);
-}
-::google::protobuf::UninterpretedOption_NamePart* UninterpretedOption::mutable_name(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.name)
-  return name_.Mutable(index);
-}
-::google::protobuf::UninterpretedOption_NamePart* UninterpretedOption::add_name() {
-  // @@protoc_insertion_point(field_add:google.protobuf.UninterpretedOption.name)
-  return name_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >*
-UninterpretedOption::mutable_name() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.UninterpretedOption.name)
-  return &name_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >&
-UninterpretedOption::name() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.UninterpretedOption.name)
-  return name_;
-}
-
-// optional string identifier_value = 3;
-bool UninterpretedOption::has_identifier_value() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void UninterpretedOption::set_has_identifier_value() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void UninterpretedOption::clear_has_identifier_value() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void UninterpretedOption::clear_identifier_value() {
-  identifier_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_identifier_value();
-}
-const ::std::string& UninterpretedOption::identifier_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.identifier_value)
-  return identifier_value_.GetNoArena();
-}
-void UninterpretedOption::set_identifier_value(const ::std::string& value) {
-  set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.identifier_value)
-}
-#if LANG_CXX11
-void UninterpretedOption::set_identifier_value(::std::string&& value) {
-  set_has_identifier_value();
-  identifier_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.identifier_value)
-}
-#endif
-void UninterpretedOption::set_identifier_value(const char* value) {
-  set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.identifier_value)
-}
-void UninterpretedOption::set_identifier_value(const char* value, size_t size) {
-  set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.identifier_value)
-}
-::std::string* UninterpretedOption::mutable_identifier_value() {
-  set_has_identifier_value();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.identifier_value)
-  return identifier_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* UninterpretedOption::release_identifier_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.identifier_value)
-  clear_has_identifier_value();
-  return identifier_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void UninterpretedOption::set_allocated_identifier_value(::std::string* identifier_value) {
-  if (identifier_value != NULL) {
-    set_has_identifier_value();
-  } else {
-    clear_has_identifier_value();
-  }
-  identifier_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), identifier_value);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.identifier_value)
-}
-
-// optional uint64 positive_int_value = 4;
-bool UninterpretedOption::has_positive_int_value() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
-}
-void UninterpretedOption::set_has_positive_int_value() {
-  _has_bits_[0] |= 0x00000008u;
-}
-void UninterpretedOption::clear_has_positive_int_value() {
-  _has_bits_[0] &= ~0x00000008u;
-}
-void UninterpretedOption::clear_positive_int_value() {
-  positive_int_value_ = GOOGLE_ULONGLONG(0);
-  clear_has_positive_int_value();
-}
-::google::protobuf::uint64 UninterpretedOption::positive_int_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.positive_int_value)
-  return positive_int_value_;
-}
-void UninterpretedOption::set_positive_int_value(::google::protobuf::uint64 value) {
-  set_has_positive_int_value();
-  positive_int_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.positive_int_value)
-}
-
-// optional int64 negative_int_value = 5;
-bool UninterpretedOption::has_negative_int_value() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
-}
-void UninterpretedOption::set_has_negative_int_value() {
-  _has_bits_[0] |= 0x00000010u;
-}
-void UninterpretedOption::clear_has_negative_int_value() {
-  _has_bits_[0] &= ~0x00000010u;
-}
-void UninterpretedOption::clear_negative_int_value() {
-  negative_int_value_ = GOOGLE_LONGLONG(0);
-  clear_has_negative_int_value();
-}
-::google::protobuf::int64 UninterpretedOption::negative_int_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.negative_int_value)
-  return negative_int_value_;
-}
-void UninterpretedOption::set_negative_int_value(::google::protobuf::int64 value) {
-  set_has_negative_int_value();
-  negative_int_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.negative_int_value)
-}
-
-// optional double double_value = 6;
-bool UninterpretedOption::has_double_value() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
-}
-void UninterpretedOption::set_has_double_value() {
-  _has_bits_[0] |= 0x00000020u;
-}
-void UninterpretedOption::clear_has_double_value() {
-  _has_bits_[0] &= ~0x00000020u;
-}
-void UninterpretedOption::clear_double_value() {
-  double_value_ = 0;
-  clear_has_double_value();
-}
-double UninterpretedOption::double_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.double_value)
-  return double_value_;
-}
-void UninterpretedOption::set_double_value(double value) {
-  set_has_double_value();
-  double_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.double_value)
-}
-
-// optional bytes string_value = 7;
-bool UninterpretedOption::has_string_value() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void UninterpretedOption::set_has_string_value() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void UninterpretedOption::clear_has_string_value() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void UninterpretedOption::clear_string_value() {
-  string_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_string_value();
-}
-const ::std::string& UninterpretedOption::string_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.string_value)
-  return string_value_.GetNoArena();
-}
-void UninterpretedOption::set_string_value(const ::std::string& value) {
-  set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.string_value)
-}
-#if LANG_CXX11
-void UninterpretedOption::set_string_value(::std::string&& value) {
-  set_has_string_value();
-  string_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.string_value)
-}
-#endif
-void UninterpretedOption::set_string_value(const char* value) {
-  set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.string_value)
-}
-void UninterpretedOption::set_string_value(const void* value, size_t size) {
-  set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.string_value)
-}
-::std::string* UninterpretedOption::mutable_string_value() {
-  set_has_string_value();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.string_value)
-  return string_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* UninterpretedOption::release_string_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.string_value)
-  clear_has_string_value();
-  return string_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void UninterpretedOption::set_allocated_string_value(::std::string* string_value) {
-  if (string_value != NULL) {
-    set_has_string_value();
-  } else {
-    clear_has_string_value();
-  }
-  string_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), string_value);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.string_value)
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// optional string aggregate_value = 8;
-bool UninterpretedOption::has_aggregate_value() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void UninterpretedOption::set_has_aggregate_value() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void UninterpretedOption::clear_has_aggregate_value() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void UninterpretedOption::clear_aggregate_value() {
-  aggregate_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_aggregate_value();
-}
-const ::std::string& UninterpretedOption::aggregate_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.aggregate_value)
-  return aggregate_value_.GetNoArena();
-}
-void UninterpretedOption::set_aggregate_value(const ::std::string& value) {
-  set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.aggregate_value)
-}
-#if LANG_CXX11
-void UninterpretedOption::set_aggregate_value(::std::string&& value) {
-  set_has_aggregate_value();
-  aggregate_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.aggregate_value)
-}
-#endif
-void UninterpretedOption::set_aggregate_value(const char* value) {
-  set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.aggregate_value)
-}
-void UninterpretedOption::set_aggregate_value(const char* value, size_t size) {
-  set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.aggregate_value)
-}
-::std::string* UninterpretedOption::mutable_aggregate_value() {
-  set_has_aggregate_value();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.aggregate_value)
-  return aggregate_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* UninterpretedOption::release_aggregate_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.aggregate_value)
-  clear_has_aggregate_value();
-  return aggregate_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void UninterpretedOption::set_allocated_aggregate_value(::std::string* aggregate_value) {
-  if (aggregate_value != NULL) {
-    set_has_aggregate_value();
-  } else {
-    clear_has_aggregate_value();
-  }
-  aggregate_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), aggregate_value);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.aggregate_value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void SourceCodeInfo_Location::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int SourceCodeInfo_Location::kPathFieldNumber;
 const int SourceCodeInfo_Location::kSpanFieldNumber;
@@ -13892,34 +12416,44 @@ const int SourceCodeInfo_Location::kLeadingDetachedCommentsFieldNumber;
 
 SourceCodeInfo_Location::SourceCodeInfo_Location()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo_Location.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.SourceCodeInfo.Location)
 }
+SourceCodeInfo_Location::SourceCodeInfo_Location(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  path_(arena),
+  span_(arena),
+  leading_detached_comments_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo_Location.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.SourceCodeInfo.Location)
+}
 SourceCodeInfo_Location::SourceCodeInfo_Location(const SourceCodeInfo_Location& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       path_(from.path_),
       span_(from.span_),
       leading_detached_comments_(from.leading_detached_comments_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   leading_comments_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_leading_comments()) {
-    leading_comments_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.leading_comments_);
+    leading_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.leading_comments(),
+      GetArenaNoVirtual());
   }
   trailing_comments_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_trailing_comments()) {
-    trailing_comments_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.trailing_comments_);
+    trailing_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.trailing_comments(),
+      GetArenaNoVirtual());
   }
   // @@protoc_insertion_point(copy_constructor:google.protobuf.SourceCodeInfo.Location)
 }
 
 void SourceCodeInfo_Location::SharedCtor() {
-  _cached_size_ = 0;
   leading_comments_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   trailing_comments_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
@@ -13930,46 +12464,47 @@ SourceCodeInfo_Location::~SourceCodeInfo_Location() {
 }
 
 void SourceCodeInfo_Location::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   leading_comments_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   trailing_comments_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
+void SourceCodeInfo_Location::ArenaDtor(void* object) {
+  SourceCodeInfo_Location* _this = reinterpret_cast< SourceCodeInfo_Location* >(object);
+  (void)_this;
+}
+void SourceCodeInfo_Location::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void SourceCodeInfo_Location::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* SourceCodeInfo_Location::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[21].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const SourceCodeInfo_Location& SourceCodeInfo_Location::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo_Location.base);
   return *internal_default_instance();
 }
 
-SourceCodeInfo_Location* SourceCodeInfo_Location::New(::google::protobuf::Arena* arena) const {
-  SourceCodeInfo_Location* n = new SourceCodeInfo_Location;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void SourceCodeInfo_Location::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.SourceCodeInfo.Location)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   path_.Clear();
   span_.Clear();
   leading_detached_comments_.Clear();
-  if (_has_bits_[0 / 32] & 3u) {
-    if (has_leading_comments()) {
-      GOOGLE_DCHECK(!leading_comments_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*leading_comments_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      leading_comments_.ClearNonDefaultToEmpty();
     }
-    if (has_trailing_comments()) {
-      GOOGLE_DCHECK(!trailing_comments_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-      (*trailing_comments_.UnsafeRawStringPointer())->clear();
+    if (cached_has_bits & 0x00000002u) {
+      trailing_comments_.ClearNonDefaultToEmpty();
     }
   }
   _has_bits_.Clear();
@@ -13982,19 +12517,20 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.SourceCodeInfo.Location)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated int32 path = 1 [packed = true];
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadPackedPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  input, this->mutable_path())));
-        } else if (static_cast< ::google::protobuf::uint8>(tag) ==
-                   static_cast< ::google::protobuf::uint8>(8u)) {
+        } else if (
+            static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadRepeatedPrimitiveNoInline<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  1, 10u, input, this->mutable_path())));
@@ -14007,12 +12543,13 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
       // repeated int32 span = 2 [packed = true];
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadPackedPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  input, this->mutable_span())));
-        } else if (static_cast< ::google::protobuf::uint8>(tag) ==
-                   static_cast< ::google::protobuf::uint8>(16u)) {
+        } else if (
+            static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadRepeatedPrimitiveNoInline<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  1, 18u, input, this->mutable_span())));
@@ -14025,11 +12562,11 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
       // optional string leading_comments = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_leading_comments()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->leading_comments().data(), this->leading_comments().length(),
+            this->leading_comments().data(), static_cast<int>(this->leading_comments().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.SourceCodeInfo.Location.leading_comments");
         } else {
@@ -14041,11 +12578,11 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
       // optional string trailing_comments = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_trailing_comments()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->trailing_comments().data(), this->trailing_comments().length(),
+            this->trailing_comments().data(), static_cast<int>(this->trailing_comments().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.SourceCodeInfo.Location.trailing_comments");
         } else {
@@ -14057,12 +12594,12 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
       // repeated string leading_detached_comments = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_leading_detached_comments()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
             this->leading_detached_comments(this->leading_detached_comments_size() - 1).data(),
-            this->leading_detached_comments(this->leading_detached_comments_size() - 1).length(),
+            static_cast<int>(this->leading_detached_comments(this->leading_detached_comments_size() - 1).length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.SourceCodeInfo.Location.leading_detached_comments");
         } else {
@@ -14073,13 +12610,11 @@ bool SourceCodeInfo_Location::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -14096,10 +12631,14 @@ failure:
 void SourceCodeInfo_Location::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.SourceCodeInfo.Location)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated int32 path = 1 [packed = true];
   if (this->path_size() > 0) {
     ::google::protobuf::internal::WireFormatLite::WriteTag(1, ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED, output);
-    output->WriteVarint32(_path_cached_byte_size_);
+    output->WriteVarint32(static_cast< ::google::protobuf::uint32>(
+        _path_cached_byte_size_));
   }
   for (int i = 0, n = this->path_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32NoTag(
@@ -14109,17 +12648,19 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   // repeated int32 span = 2 [packed = true];
   if (this->span_size() > 0) {
     ::google::protobuf::internal::WireFormatLite::WriteTag(2, ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED, output);
-    output->WriteVarint32(_span_cached_byte_size_);
+    output->WriteVarint32(static_cast< ::google::protobuf::uint32>(
+        _span_cached_byte_size_));
   }
   for (int i = 0, n = this->span_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32NoTag(
       this->span(i), output);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string leading_comments = 3;
-  if (has_leading_comments()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->leading_comments().data(), this->leading_comments().length(),
+      this->leading_comments().data(), static_cast<int>(this->leading_comments().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.leading_comments");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -14127,9 +12668,9 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   }
 
   // optional string trailing_comments = 4;
-  if (has_trailing_comments()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->trailing_comments().data(), this->trailing_comments().length(),
+      this->trailing_comments().data(), static_cast<int>(this->trailing_comments().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.trailing_comments");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -14139,7 +12680,7 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   // repeated string leading_detached_comments = 6;
   for (int i = 0, n = this->leading_detached_comments_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->leading_detached_comments(i).data(), this->leading_detached_comments(i).length(),
+      this->leading_detached_comments(i).data(), static_cast<int>(this->leading_detached_comments(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.leading_detached_comments");
     ::google::protobuf::internal::WireFormatLite::WriteString(
@@ -14148,15 +12689,18 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.SourceCodeInfo.Location)
 }
 
 ::google::protobuf::uint8* SourceCodeInfo_Location::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.SourceCodeInfo.Location)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated int32 path = 1 [packed = true];
   if (this->path_size() > 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteTagToArray(
@@ -14164,11 +12708,10 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
       ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,
       target);
     target = ::google::protobuf::io::CodedOutputStream::WriteVarint32ToArray(
-      _path_cached_byte_size_, target);
-  }
-  for (int i = 0, n = this->path_size(); i < n; i++) {
+        static_cast< ::google::protobuf::int32>(
+            _path_cached_byte_size_), target);
     target = ::google::protobuf::internal::WireFormatLite::
-      WriteInt32NoTagToArray(this->path(i), target);
+      WriteInt32NoTagToArray(this->path_, target);
   }
 
   // repeated int32 span = 2 [packed = true];
@@ -14178,17 +12721,17 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
       ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,
       target);
     target = ::google::protobuf::io::CodedOutputStream::WriteVarint32ToArray(
-      _span_cached_byte_size_, target);
-  }
-  for (int i = 0, n = this->span_size(); i < n; i++) {
+        static_cast< ::google::protobuf::int32>(
+            _span_cached_byte_size_), target);
     target = ::google::protobuf::internal::WireFormatLite::
-      WriteInt32NoTagToArray(this->span(i), target);
+      WriteInt32NoTagToArray(this->span_, target);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string leading_comments = 3;
-  if (has_leading_comments()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->leading_comments().data(), this->leading_comments().length(),
+      this->leading_comments().data(), static_cast<int>(this->leading_comments().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.leading_comments");
     target =
@@ -14197,9 +12740,9 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   }
 
   // optional string trailing_comments = 4;
-  if (has_trailing_comments()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->trailing_comments().data(), this->trailing_comments().length(),
+      this->trailing_comments().data(), static_cast<int>(this->trailing_comments().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.trailing_comments");
     target =
@@ -14210,7 +12753,7 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
   // repeated string leading_detached_comments = 6;
   for (int i = 0, n = this->leading_detached_comments_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->leading_detached_comments(i).data(), this->leading_detached_comments(i).length(),
+      this->leading_detached_comments(i).data(), static_cast<int>(this->leading_detached_comments(i).length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.SourceCodeInfo.Location.leading_detached_comments");
     target = ::google::protobuf::internal::WireFormatLite::
@@ -14219,7 +12762,7 @@ void SourceCodeInfo_Location::SerializeWithCachedSizes(
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.SourceCodeInfo.Location)
   return target;
@@ -14232,7 +12775,7 @@ size_t SourceCodeInfo_Location::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated int32 path = 1 [packed = true];
   {
@@ -14240,7 +12783,8 @@ size_t SourceCodeInfo_Location::ByteSizeLong() const {
       Int32Size(this->path_);
     if (data_size > 0) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::Int32Size(data_size);
+        ::google::protobuf::internal::WireFormatLite::Int32Size(
+            static_cast< ::google::protobuf::int32>(data_size));
     }
     int cached_size = ::google::protobuf::internal::ToCachedSize(data_size);
     GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
@@ -14255,7 +12799,8 @@ size_t SourceCodeInfo_Location::ByteSizeLong() const {
       Int32Size(this->span_);
     if (data_size > 0) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::Int32Size(data_size);
+        ::google::protobuf::internal::WireFormatLite::Int32Size(
+            static_cast< ::google::protobuf::int32>(data_size));
     }
     int cached_size = ::google::protobuf::internal::ToCachedSize(data_size);
     GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
@@ -14289,9 +12834,7 @@ size_t SourceCodeInfo_Location::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -14314,17 +12857,19 @@ void SourceCodeInfo_Location::MergeFrom(const SourceCodeInfo_Location& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.SourceCodeInfo.Location)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   path_.MergeFrom(from.path_);
   span_.MergeFrom(from.span_);
   leading_detached_comments_.MergeFrom(from.leading_detached_comments_);
-  if (from._has_bits_[0 / 32] & 3u) {
-    if (from.has_leading_comments()) {
-      set_has_leading_comments();
-      leading_comments_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.leading_comments_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 3u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_leading_comments(from.leading_comments());
     }
-    if (from.has_trailing_comments()) {
-      set_has_trailing_comments();
-      trailing_comments_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.trailing_comments_);
+    if (cached_has_bits & 0x00000002u) {
+      set_trailing_comments(from.trailing_comments());
     }
   }
 }
@@ -14349,306 +12894,76 @@ bool SourceCodeInfo_Location::IsInitialized() const {
 
 void SourceCodeInfo_Location::Swap(SourceCodeInfo_Location* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    SourceCodeInfo_Location* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void SourceCodeInfo_Location::UnsafeArenaSwap(SourceCodeInfo_Location* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void SourceCodeInfo_Location::InternalSwap(SourceCodeInfo_Location* other) {
-  path_.UnsafeArenaSwap(&other->path_);
-  span_.UnsafeArenaSwap(&other->span_);
-  leading_detached_comments_.UnsafeArenaSwap(&other->leading_detached_comments_);
-  leading_comments_.Swap(&other->leading_comments_);
-  trailing_comments_.Swap(&other->trailing_comments_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  path_.InternalSwap(&other->path_);
+  span_.InternalSwap(&other->span_);
+  leading_detached_comments_.InternalSwap(CastToBase(&other->leading_detached_comments_));
+  leading_comments_.Swap(&other->leading_comments_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  trailing_comments_.Swap(&other->trailing_comments_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata SourceCodeInfo_Location::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[21];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// SourceCodeInfo_Location
-
-// repeated int32 path = 1 [packed = true];
-int SourceCodeInfo_Location::path_size() const {
-  return path_.size();
-}
-void SourceCodeInfo_Location::clear_path() {
-  path_.Clear();
-}
-::google::protobuf::int32 SourceCodeInfo_Location::path(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.path)
-  return path_.Get(index);
-}
-void SourceCodeInfo_Location::set_path(int index, ::google::protobuf::int32 value) {
-  path_.Set(index, value);
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.path)
-}
-void SourceCodeInfo_Location::add_path(::google::protobuf::int32 value) {
-  path_.Add(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.Location.path)
-}
-const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-SourceCodeInfo_Location::path() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.SourceCodeInfo.Location.path)
-  return path_;
-}
-::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-SourceCodeInfo_Location::mutable_path() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.SourceCodeInfo.Location.path)
-  return &path_;
-}
-
-// repeated int32 span = 2 [packed = true];
-int SourceCodeInfo_Location::span_size() const {
-  return span_.size();
-}
-void SourceCodeInfo_Location::clear_span() {
-  span_.Clear();
-}
-::google::protobuf::int32 SourceCodeInfo_Location::span(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.span)
-  return span_.Get(index);
-}
-void SourceCodeInfo_Location::set_span(int index, ::google::protobuf::int32 value) {
-  span_.Set(index, value);
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.span)
-}
-void SourceCodeInfo_Location::add_span(::google::protobuf::int32 value) {
-  span_.Add(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.Location.span)
-}
-const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-SourceCodeInfo_Location::span() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.SourceCodeInfo.Location.span)
-  return span_;
-}
-::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-SourceCodeInfo_Location::mutable_span() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.SourceCodeInfo.Location.span)
-  return &span_;
-}
-
-// optional string leading_comments = 3;
-bool SourceCodeInfo_Location::has_leading_comments() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void SourceCodeInfo_Location::set_has_leading_comments() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void SourceCodeInfo_Location::clear_has_leading_comments() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void SourceCodeInfo_Location::clear_leading_comments() {
-  leading_comments_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_leading_comments();
-}
-const ::std::string& SourceCodeInfo_Location::leading_comments() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.leading_comments)
-  return leading_comments_.GetNoArena();
-}
-void SourceCodeInfo_Location::set_leading_comments(const ::std::string& value) {
-  set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.leading_comments)
-}
-#if LANG_CXX11
-void SourceCodeInfo_Location::set_leading_comments(::std::string&& value) {
-  set_has_leading_comments();
-  leading_comments_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.SourceCodeInfo.Location.leading_comments)
-}
-#endif
-void SourceCodeInfo_Location::set_leading_comments(const char* value) {
-  set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.leading_comments)
-}
-void SourceCodeInfo_Location::set_leading_comments(const char* value, size_t size) {
-  set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceCodeInfo.Location.leading_comments)
-}
-::std::string* SourceCodeInfo_Location::mutable_leading_comments() {
-  set_has_leading_comments();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.Location.leading_comments)
-  return leading_comments_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* SourceCodeInfo_Location::release_leading_comments() {
-  // @@protoc_insertion_point(field_release:google.protobuf.SourceCodeInfo.Location.leading_comments)
-  clear_has_leading_comments();
-  return leading_comments_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void SourceCodeInfo_Location::set_allocated_leading_comments(::std::string* leading_comments) {
-  if (leading_comments != NULL) {
-    set_has_leading_comments();
-  } else {
-    clear_has_leading_comments();
-  }
-  leading_comments_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), leading_comments);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceCodeInfo.Location.leading_comments)
-}
-
-// optional string trailing_comments = 4;
-bool SourceCodeInfo_Location::has_trailing_comments() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void SourceCodeInfo_Location::set_has_trailing_comments() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void SourceCodeInfo_Location::clear_has_trailing_comments() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void SourceCodeInfo_Location::clear_trailing_comments() {
-  trailing_comments_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_trailing_comments();
-}
-const ::std::string& SourceCodeInfo_Location::trailing_comments() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-  return trailing_comments_.GetNoArena();
-}
-void SourceCodeInfo_Location::set_trailing_comments(const ::std::string& value) {
-  set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-}
-#if LANG_CXX11
-void SourceCodeInfo_Location::set_trailing_comments(::std::string&& value) {
-  set_has_trailing_comments();
-  trailing_comments_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-}
-#endif
-void SourceCodeInfo_Location::set_trailing_comments(const char* value) {
-  set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-}
-void SourceCodeInfo_Location::set_trailing_comments(const char* value, size_t size) {
-  set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-}
-::std::string* SourceCodeInfo_Location::mutable_trailing_comments() {
-  set_has_trailing_comments();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-  return trailing_comments_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* SourceCodeInfo_Location::release_trailing_comments() {
-  // @@protoc_insertion_point(field_release:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-  clear_has_trailing_comments();
-  return trailing_comments_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void SourceCodeInfo_Location::set_allocated_trailing_comments(::std::string* trailing_comments) {
-  if (trailing_comments != NULL) {
-    set_has_trailing_comments();
-  } else {
-    clear_has_trailing_comments();
-  }
-  trailing_comments_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), trailing_comments);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-}
-
-// repeated string leading_detached_comments = 6;
-int SourceCodeInfo_Location::leading_detached_comments_size() const {
-  return leading_detached_comments_.size();
-}
-void SourceCodeInfo_Location::clear_leading_detached_comments() {
-  leading_detached_comments_.Clear();
-}
-const ::std::string& SourceCodeInfo_Location::leading_detached_comments(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  return leading_detached_comments_.Get(index);
-}
-::std::string* SourceCodeInfo_Location::mutable_leading_detached_comments(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  return leading_detached_comments_.Mutable(index);
-}
-void SourceCodeInfo_Location::set_leading_detached_comments(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  leading_detached_comments_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void SourceCodeInfo_Location::set_leading_detached_comments(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  leading_detached_comments_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void SourceCodeInfo_Location::set_leading_detached_comments(int index, const char* value) {
-  leading_detached_comments_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-void SourceCodeInfo_Location::set_leading_detached_comments(int index, const char* value, size_t size) {
-  leading_detached_comments_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-::std::string* SourceCodeInfo_Location::add_leading_detached_comments() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  return leading_detached_comments_.Add();
-}
-void SourceCodeInfo_Location::add_leading_detached_comments(const ::std::string& value) {
-  leading_detached_comments_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-#if LANG_CXX11
-void SourceCodeInfo_Location::add_leading_detached_comments(::std::string&& value) {
-  leading_detached_comments_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-#endif
-void SourceCodeInfo_Location::add_leading_detached_comments(const char* value) {
-  leading_detached_comments_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-void SourceCodeInfo_Location::add_leading_detached_comments(const char* value, size_t size) {
-  leading_detached_comments_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-}
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-SourceCodeInfo_Location::leading_detached_comments() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  return leading_detached_comments_;
-}
-::google::protobuf::RepeatedPtrField< ::std::string>*
-SourceCodeInfo_Location::mutable_leading_detached_comments() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
-  return &leading_detached_comments_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void SourceCodeInfo::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int SourceCodeInfo::kLocationFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 SourceCodeInfo::SourceCodeInfo()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.SourceCodeInfo)
 }
+SourceCodeInfo::SourceCodeInfo(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  location_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.SourceCodeInfo)
+}
 SourceCodeInfo::SourceCodeInfo(const SourceCodeInfo& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       location_(from.location_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.SourceCodeInfo)
 }
 
 void SourceCodeInfo::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 SourceCodeInfo::~SourceCodeInfo() {
@@ -14657,33 +12972,35 @@ SourceCodeInfo::~SourceCodeInfo() {
 }
 
 void SourceCodeInfo::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void SourceCodeInfo::ArenaDtor(void* object) {
+  SourceCodeInfo* _this = reinterpret_cast< SourceCodeInfo* >(object);
+  (void)_this;
+}
+void SourceCodeInfo::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void SourceCodeInfo::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* SourceCodeInfo::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[22].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const SourceCodeInfo& SourceCodeInfo::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_SourceCodeInfo.base);
   return *internal_default_instance();
 }
 
-SourceCodeInfo* SourceCodeInfo::New(::google::protobuf::Arena* arena) const {
-  SourceCodeInfo* n = new SourceCodeInfo;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void SourceCodeInfo::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.SourceCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   location_.Clear();
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -14695,33 +13012,29 @@ bool SourceCodeInfo::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.SourceCodeInfo)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.SourceCodeInfo.Location location = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_location()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -14738,33 +13051,43 @@ failure:
 void SourceCodeInfo::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.SourceCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.SourceCodeInfo.Location location = 1;
-  for (unsigned int i = 0, n = this->location_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->location_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      1, this->location(i), output);
+      1,
+      this->location(static_cast<int>(i)),
+      output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.SourceCodeInfo)
 }
 
 ::google::protobuf::uint8* SourceCodeInfo::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.SourceCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.SourceCodeInfo.Location location = 1;
-  for (unsigned int i = 0, n = this->location_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->location_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        1, this->location(i), false, target);
+      InternalWriteMessageToArray(
+        1, this->location(static_cast<int>(i)), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.SourceCodeInfo)
   return target;
@@ -14777,23 +13100,21 @@ size_t SourceCodeInfo::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.SourceCodeInfo.Location location = 1;
   {
-    unsigned int count = this->location_size();
+    unsigned int count = static_cast<unsigned int>(this->location_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->location(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->location(static_cast<int>(i)));
     }
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -14816,6 +13137,9 @@ void SourceCodeInfo::MergeFrom(const SourceCodeInfo& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.SourceCodeInfo)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   location_.MergeFrom(from.location_);
 }
 
@@ -14839,57 +13163,40 @@ bool SourceCodeInfo::IsInitialized() const {
 
 void SourceCodeInfo::Swap(SourceCodeInfo* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    SourceCodeInfo* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void SourceCodeInfo::UnsafeArenaSwap(SourceCodeInfo* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void SourceCodeInfo::InternalSwap(SourceCodeInfo* other) {
-  location_.UnsafeArenaSwap(&other->location_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&location_)->InternalSwap(CastToBase(&other->location_));
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata SourceCodeInfo::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[22];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// SourceCodeInfo
-
-// repeated .google.protobuf.SourceCodeInfo.Location location = 1;
-int SourceCodeInfo::location_size() const {
-  return location_.size();
-}
-void SourceCodeInfo::clear_location() {
-  location_.Clear();
-}
-const ::google::protobuf::SourceCodeInfo_Location& SourceCodeInfo::location(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.location)
-  return location_.Get(index);
-}
-::google::protobuf::SourceCodeInfo_Location* SourceCodeInfo::mutable_location(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.location)
-  return location_.Mutable(index);
-}
-::google::protobuf::SourceCodeInfo_Location* SourceCodeInfo::add_location() {
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.location)
-  return location_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >*
-SourceCodeInfo::mutable_location() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.SourceCodeInfo.location)
-  return &location_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >&
-SourceCodeInfo::location() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.SourceCodeInfo.location)
-  return location_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void GeneratedCodeInfo_Annotation::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int GeneratedCodeInfo_Annotation::kPathFieldNumber;
 const int GeneratedCodeInfo_Annotation::kSourceFileFieldNumber;
@@ -14899,34 +13206,42 @@ const int GeneratedCodeInfo_Annotation::kEndFieldNumber;
 
 GeneratedCodeInfo_Annotation::GeneratedCodeInfo_Annotation()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo_Annotation.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.GeneratedCodeInfo.Annotation)
 }
+GeneratedCodeInfo_Annotation::GeneratedCodeInfo_Annotation(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  path_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo_Annotation.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.GeneratedCodeInfo.Annotation)
+}
 GeneratedCodeInfo_Annotation::GeneratedCodeInfo_Annotation(const GeneratedCodeInfo_Annotation& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       path_(from.path_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   source_file_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.has_source_file()) {
-    source_file_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.source_file_);
+    source_file_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.source_file(),
+      GetArenaNoVirtual());
   }
   ::memcpy(&begin_, &from.begin_,
-    reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&begin_) + sizeof(end_));
+    static_cast<size_t>(reinterpret_cast<char*>(&end_) -
+    reinterpret_cast<char*>(&begin_)) + sizeof(end_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.GeneratedCodeInfo.Annotation)
 }
 
 void GeneratedCodeInfo_Annotation::SharedCtor() {
-  _cached_size_ = 0;
   source_file_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&begin_, 0, reinterpret_cast<char*>(&end_) -
-    reinterpret_cast<char*>(&begin_) + sizeof(end_));
+  ::memset(&begin_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&end_) -
+      reinterpret_cast<char*>(&begin_)) + sizeof(end_));
 }
 
 GeneratedCodeInfo_Annotation::~GeneratedCodeInfo_Annotation() {
@@ -14935,42 +13250,45 @@ GeneratedCodeInfo_Annotation::~GeneratedCodeInfo_Annotation() {
 }
 
 void GeneratedCodeInfo_Annotation::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   source_file_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
+void GeneratedCodeInfo_Annotation::ArenaDtor(void* object) {
+  GeneratedCodeInfo_Annotation* _this = reinterpret_cast< GeneratedCodeInfo_Annotation* >(object);
+  (void)_this;
+}
+void GeneratedCodeInfo_Annotation::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void GeneratedCodeInfo_Annotation::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* GeneratedCodeInfo_Annotation::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[23].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const GeneratedCodeInfo_Annotation& GeneratedCodeInfo_Annotation::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo_Annotation.base);
   return *internal_default_instance();
 }
 
-GeneratedCodeInfo_Annotation* GeneratedCodeInfo_Annotation::New(::google::protobuf::Arena* arena) const {
-  GeneratedCodeInfo_Annotation* n = new GeneratedCodeInfo_Annotation;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void GeneratedCodeInfo_Annotation::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.GeneratedCodeInfo.Annotation)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   path_.Clear();
-  if (has_source_file()) {
-    GOOGLE_DCHECK(!source_file_.IsDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited()));
-    (*source_file_.UnsafeRawStringPointer())->clear();
+  cached_has_bits = _has_bits_[0];
+  if (cached_has_bits & 0x00000001u) {
+    source_file_.ClearNonDefaultToEmpty();
   }
-  if (_has_bits_[0 / 32] & 6u) {
-    ::memset(&begin_, 0, reinterpret_cast<char*>(&end_) -
-      reinterpret_cast<char*>(&begin_) + sizeof(end_));
+  if (cached_has_bits & 6u) {
+    ::memset(&begin_, 0, static_cast<size_t>(
+        reinterpret_cast<char*>(&end_) -
+        reinterpret_cast<char*>(&begin_)) + sizeof(end_));
   }
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -14982,19 +13300,20 @@ bool GeneratedCodeInfo_Annotation::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.GeneratedCodeInfo.Annotation)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated int32 path = 1 [packed = true];
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadPackedPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  input, this->mutable_path())));
-        } else if (static_cast< ::google::protobuf::uint8>(tag) ==
-                   static_cast< ::google::protobuf::uint8>(8u)) {
+        } else if (
+            static_cast< ::google::protobuf::uint8>(tag) ==
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           DO_((::google::protobuf::internal::WireFormatLite::ReadRepeatedPrimitiveNoInline<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
                  1, 10u, input, this->mutable_path())));
@@ -15007,11 +13326,11 @@ bool GeneratedCodeInfo_Annotation::MergePartialFromCodedStream(
       // optional string source_file = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_source_file()));
           ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-            this->source_file().data(), this->source_file().length(),
+            this->source_file().data(), static_cast<int>(this->source_file().length()),
             ::google::protobuf::internal::WireFormat::PARSE,
             "google.protobuf.GeneratedCodeInfo.Annotation.source_file");
         } else {
@@ -15023,7 +13342,7 @@ bool GeneratedCodeInfo_Annotation::MergePartialFromCodedStream(
       // optional int32 begin = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
           set_has_begin();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -15037,7 +13356,7 @@ bool GeneratedCodeInfo_Annotation::MergePartialFromCodedStream(
       // optional int32 end = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(32u)) {
+            static_cast< ::google::protobuf::uint8>(32u /* 32 & 0xFF */)) {
           set_has_end();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -15050,13 +13369,11 @@ bool GeneratedCodeInfo_Annotation::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -15073,20 +13390,25 @@ failure:
 void GeneratedCodeInfo_Annotation::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.GeneratedCodeInfo.Annotation)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated int32 path = 1 [packed = true];
   if (this->path_size() > 0) {
     ::google::protobuf::internal::WireFormatLite::WriteTag(1, ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED, output);
-    output->WriteVarint32(_path_cached_byte_size_);
+    output->WriteVarint32(static_cast< ::google::protobuf::uint32>(
+        _path_cached_byte_size_));
   }
   for (int i = 0, n = this->path_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32NoTag(
       this->path(i), output);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string source_file = 2;
-  if (has_source_file()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->source_file().data(), this->source_file().length(),
+      this->source_file().data(), static_cast<int>(this->source_file().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.GeneratedCodeInfo.Annotation.source_file");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -15094,26 +13416,29 @@ void GeneratedCodeInfo_Annotation::SerializeWithCachedSizes(
   }
 
   // optional int32 begin = 3;
-  if (has_begin()) {
+  if (cached_has_bits & 0x00000002u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(3, this->begin(), output);
   }
 
   // optional int32 end = 4;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000004u) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(4, this->end(), output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.GeneratedCodeInfo.Annotation)
 }
 
 ::google::protobuf::uint8* GeneratedCodeInfo_Annotation::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.GeneratedCodeInfo.Annotation)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated int32 path = 1 [packed = true];
   if (this->path_size() > 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteTagToArray(
@@ -15121,17 +13446,17 @@ void GeneratedCodeInfo_Annotation::SerializeWithCachedSizes(
       ::google::protobuf::internal::WireFormatLite::WIRETYPE_LENGTH_DELIMITED,
       target);
     target = ::google::protobuf::io::CodedOutputStream::WriteVarint32ToArray(
-      _path_cached_byte_size_, target);
-  }
-  for (int i = 0, n = this->path_size(); i < n; i++) {
+        static_cast< ::google::protobuf::int32>(
+            _path_cached_byte_size_), target);
     target = ::google::protobuf::internal::WireFormatLite::
-      WriteInt32NoTagToArray(this->path(i), target);
+      WriteInt32NoTagToArray(this->path_, target);
   }
 
+  cached_has_bits = _has_bits_[0];
   // optional string source_file = 2;
-  if (has_source_file()) {
+  if (cached_has_bits & 0x00000001u) {
     ::google::protobuf::internal::WireFormat::VerifyUTF8StringNamedField(
-      this->source_file().data(), this->source_file().length(),
+      this->source_file().data(), static_cast<int>(this->source_file().length()),
       ::google::protobuf::internal::WireFormat::SERIALIZE,
       "google.protobuf.GeneratedCodeInfo.Annotation.source_file");
     target =
@@ -15140,18 +13465,18 @@ void GeneratedCodeInfo_Annotation::SerializeWithCachedSizes(
   }
 
   // optional int32 begin = 3;
-  if (has_begin()) {
+  if (cached_has_bits & 0x00000002u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(3, this->begin(), target);
   }
 
   // optional int32 end = 4;
-  if (has_end()) {
+  if (cached_has_bits & 0x00000004u) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(4, this->end(), target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.GeneratedCodeInfo.Annotation)
   return target;
@@ -15164,7 +13489,7 @@ size_t GeneratedCodeInfo_Annotation::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated int32 path = 1 [packed = true];
   {
@@ -15172,7 +13497,8 @@ size_t GeneratedCodeInfo_Annotation::ByteSizeLong() const {
       Int32Size(this->path_);
     if (data_size > 0) {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::Int32Size(data_size);
+        ::google::protobuf::internal::WireFormatLite::Int32Size(
+            static_cast< ::google::protobuf::int32>(data_size));
     }
     int cached_size = ::google::protobuf::internal::ToCachedSize(data_size);
     GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
@@ -15205,9 +13531,7 @@ size_t GeneratedCodeInfo_Annotation::ByteSizeLong() const {
 
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -15230,18 +13554,22 @@ void GeneratedCodeInfo_Annotation::MergeFrom(const GeneratedCodeInfo_Annotation&
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.GeneratedCodeInfo.Annotation)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   path_.MergeFrom(from.path_);
-  if (from._has_bits_[0 / 32] & 7u) {
-    if (from.has_source_file()) {
-      set_has_source_file();
-      source_file_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.source_file_);
+  cached_has_bits = from._has_bits_[0];
+  if (cached_has_bits & 7u) {
+    if (cached_has_bits & 0x00000001u) {
+      set_source_file(from.source_file());
     }
-    if (from.has_begin()) {
-      set_begin(from.begin());
+    if (cached_has_bits & 0x00000002u) {
+      begin_ = from.begin_;
     }
-    if (from.has_end()) {
-      set_end(from.end());
+    if (cached_has_bits & 0x00000004u) {
+      end_ = from.end_;
     }
+    _has_bits_[0] |= cached_has_bits;
   }
 }
 
@@ -15265,194 +13593,74 @@ bool GeneratedCodeInfo_Annotation::IsInitialized() const {
 
 void GeneratedCodeInfo_Annotation::Swap(GeneratedCodeInfo_Annotation* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    GeneratedCodeInfo_Annotation* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void GeneratedCodeInfo_Annotation::UnsafeArenaSwap(GeneratedCodeInfo_Annotation* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void GeneratedCodeInfo_Annotation::InternalSwap(GeneratedCodeInfo_Annotation* other) {
-  path_.UnsafeArenaSwap(&other->path_);
-  source_file_.Swap(&other->source_file_);
-  std::swap(begin_, other->begin_);
-  std::swap(end_, other->end_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  path_.InternalSwap(&other->path_);
+  source_file_.Swap(&other->source_file_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(begin_, other->begin_);
+  swap(end_, other->end_);
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata GeneratedCodeInfo_Annotation::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[23];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// GeneratedCodeInfo_Annotation
-
-// repeated int32 path = 1 [packed = true];
-int GeneratedCodeInfo_Annotation::path_size() const {
-  return path_.size();
-}
-void GeneratedCodeInfo_Annotation::clear_path() {
-  path_.Clear();
-}
-::google::protobuf::int32 GeneratedCodeInfo_Annotation::path(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.Annotation.path)
-  return path_.Get(index);
-}
-void GeneratedCodeInfo_Annotation::set_path(int index, ::google::protobuf::int32 value) {
-  path_.Set(index, value);
-  // @@protoc_insertion_point(field_set:google.protobuf.GeneratedCodeInfo.Annotation.path)
-}
-void GeneratedCodeInfo_Annotation::add_path(::google::protobuf::int32 value) {
-  path_.Add(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.GeneratedCodeInfo.Annotation.path)
-}
-const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-GeneratedCodeInfo_Annotation::path() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.GeneratedCodeInfo.Annotation.path)
-  return path_;
-}
-::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-GeneratedCodeInfo_Annotation::mutable_path() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.GeneratedCodeInfo.Annotation.path)
-  return &path_;
-}
-
-// optional string source_file = 2;
-bool GeneratedCodeInfo_Annotation::has_source_file() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
-}
-void GeneratedCodeInfo_Annotation::set_has_source_file() {
-  _has_bits_[0] |= 0x00000001u;
-}
-void GeneratedCodeInfo_Annotation::clear_has_source_file() {
-  _has_bits_[0] &= ~0x00000001u;
-}
-void GeneratedCodeInfo_Annotation::clear_source_file() {
-  source_file_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  clear_has_source_file();
-}
-const ::std::string& GeneratedCodeInfo_Annotation::source_file() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-  return source_file_.GetNoArena();
-}
-void GeneratedCodeInfo_Annotation::set_source_file(const ::std::string& value) {
-  set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-}
-#if LANG_CXX11
-void GeneratedCodeInfo_Annotation::set_source_file(::std::string&& value) {
-  set_has_source_file();
-  source_file_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-}
-#endif
-void GeneratedCodeInfo_Annotation::set_source_file(const char* value) {
-  set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-}
-void GeneratedCodeInfo_Annotation::set_source_file(const char* value, size_t size) {
-  set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-}
-::std::string* GeneratedCodeInfo_Annotation::mutable_source_file() {
-  set_has_source_file();
-  // @@protoc_insertion_point(field_mutable:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-  return source_file_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* GeneratedCodeInfo_Annotation::release_source_file() {
-  // @@protoc_insertion_point(field_release:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-  clear_has_source_file();
-  return source_file_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void GeneratedCodeInfo_Annotation::set_allocated_source_file(::std::string* source_file) {
-  if (source_file != NULL) {
-    set_has_source_file();
-  } else {
-    clear_has_source_file();
-  }
-  source_file_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), source_file);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-}
-
-// optional int32 begin = 3;
-bool GeneratedCodeInfo_Annotation::has_begin() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
-}
-void GeneratedCodeInfo_Annotation::set_has_begin() {
-  _has_bits_[0] |= 0x00000002u;
-}
-void GeneratedCodeInfo_Annotation::clear_has_begin() {
-  _has_bits_[0] &= ~0x00000002u;
-}
-void GeneratedCodeInfo_Annotation::clear_begin() {
-  begin_ = 0;
-  clear_has_begin();
-}
-::google::protobuf::int32 GeneratedCodeInfo_Annotation::begin() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.Annotation.begin)
-  return begin_;
-}
-void GeneratedCodeInfo_Annotation::set_begin(::google::protobuf::int32 value) {
-  set_has_begin();
-  begin_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.GeneratedCodeInfo.Annotation.begin)
-}
-
-// optional int32 end = 4;
-bool GeneratedCodeInfo_Annotation::has_end() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
-}
-void GeneratedCodeInfo_Annotation::set_has_end() {
-  _has_bits_[0] |= 0x00000004u;
-}
-void GeneratedCodeInfo_Annotation::clear_has_end() {
-  _has_bits_[0] &= ~0x00000004u;
-}
-void GeneratedCodeInfo_Annotation::clear_end() {
-  end_ = 0;
-  clear_has_end();
-}
-::google::protobuf::int32 GeneratedCodeInfo_Annotation::end() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.Annotation.end)
-  return end_;
-}
-void GeneratedCodeInfo_Annotation::set_end(::google::protobuf::int32 value) {
-  set_has_end();
-  end_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.GeneratedCodeInfo.Annotation.end)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void GeneratedCodeInfo::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int GeneratedCodeInfo::kAnnotationFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 GeneratedCodeInfo::GeneratedCodeInfo()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.GeneratedCodeInfo)
 }
+GeneratedCodeInfo::GeneratedCodeInfo(::google::protobuf::Arena* arena)
+  : ::google::protobuf::Message(),
+  _internal_metadata_(arena),
+  annotation_(arena) {
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo.base);
+  SharedCtor();
+  RegisterArenaDtor(arena);
+  // @@protoc_insertion_point(arena_constructor:google.protobuf.GeneratedCodeInfo)
+}
 GeneratedCodeInfo::GeneratedCodeInfo(const GeneratedCodeInfo& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       _has_bits_(from._has_bits_),
-      _cached_size_(0),
       annotation_(from.annotation_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.GeneratedCodeInfo)
 }
 
 void GeneratedCodeInfo::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 GeneratedCodeInfo::~GeneratedCodeInfo() {
@@ -15461,33 +13669,35 @@ GeneratedCodeInfo::~GeneratedCodeInfo() {
 }
 
 void GeneratedCodeInfo::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
+void GeneratedCodeInfo::ArenaDtor(void* object) {
+  GeneratedCodeInfo* _this = reinterpret_cast< GeneratedCodeInfo* >(object);
+  (void)_this;
+}
+void GeneratedCodeInfo::RegisterArenaDtor(::google::protobuf::Arena*) {
+}
 void GeneratedCodeInfo::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* GeneratedCodeInfo::descriptor() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[24].descriptor;
+  ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const GeneratedCodeInfo& GeneratedCodeInfo::default_instance() {
-  protobuf_google_2fprotobuf_2fdescriptor_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fdescriptor_2eproto::scc_info_GeneratedCodeInfo.base);
   return *internal_default_instance();
 }
 
-GeneratedCodeInfo* GeneratedCodeInfo::New(::google::protobuf::Arena* arena) const {
-  GeneratedCodeInfo* n = new GeneratedCodeInfo;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void GeneratedCodeInfo::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.GeneratedCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   annotation_.Clear();
   _has_bits_.Clear();
   _internal_metadata_.Clear();
@@ -15499,33 +13709,29 @@ bool GeneratedCodeInfo::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.GeneratedCodeInfo)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_annotation()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
         DO_(::google::protobuf::internal::WireFormat::SkipField(
-              input, tag, mutable_unknown_fields()));
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -15542,33 +13748,43 @@ failure:
 void GeneratedCodeInfo::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.GeneratedCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;
-  for (unsigned int i = 0, n = this->annotation_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->annotation_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      1, this->annotation(i), output);
+      1,
+      this->annotation(static_cast<int>(i)),
+      output);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
-        unknown_fields(), output);
+        _internal_metadata_.unknown_fields(), output);
   }
   // @@protoc_insertion_point(serialize_end:google.protobuf.GeneratedCodeInfo)
 }
 
 ::google::protobuf::uint8* GeneratedCodeInfo::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.GeneratedCodeInfo)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;
-  for (unsigned int i = 0, n = this->annotation_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->annotation_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        1, this->annotation(i), false, target);
+      InternalWriteMessageToArray(
+        1, this->annotation(static_cast<int>(i)), deterministic, target);
   }
 
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
-        unknown_fields(), target);
+        _internal_metadata_.unknown_fields(), target);
   }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.GeneratedCodeInfo)
   return target;
@@ -15581,23 +13797,21 @@ size_t GeneratedCodeInfo::ByteSizeLong() const {
   if (_internal_metadata_.have_unknown_fields()) {
     total_size +=
       ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
-        unknown_fields());
+        _internal_metadata_.unknown_fields());
   }
   // repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;
   {
-    unsigned int count = this->annotation_size();
+    unsigned int count = static_cast<unsigned int>(this->annotation_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->annotation(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->annotation(static_cast<int>(i)));
     }
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -15620,6 +13834,9 @@ void GeneratedCodeInfo::MergeFrom(const GeneratedCodeInfo& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.GeneratedCodeInfo)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   annotation_.MergeFrom(from.annotation_);
 }
 
@@ -15643,57 +13860,122 @@ bool GeneratedCodeInfo::IsInitialized() const {
 
 void GeneratedCodeInfo::Swap(GeneratedCodeInfo* other) {
   if (other == this) return;
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
+    InternalSwap(other);
+  } else {
+    GeneratedCodeInfo* temp = New(GetArenaNoVirtual());
+    temp->MergeFrom(*other);
+    other->CopyFrom(*this);
+    InternalSwap(temp);
+    if (GetArenaNoVirtual() == NULL) {
+      delete temp;
+    }
+  }
+}
+void GeneratedCodeInfo::UnsafeArenaSwap(GeneratedCodeInfo* other) {
+  if (other == this) return;
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 void GeneratedCodeInfo::InternalSwap(GeneratedCodeInfo* other) {
-  annotation_.UnsafeArenaSwap(&other->annotation_);
-  std::swap(_has_bits_[0], other->_has_bits_[0]);
+  using std::swap;
+  CastToBase(&annotation_)->InternalSwap(CastToBase(&other->annotation_));
+  swap(_has_bits_[0], other->_has_bits_[0]);
   _internal_metadata_.Swap(&other->_internal_metadata_);
-  std::swap(_cached_size_, other->_cached_size_);
 }
 
 ::google::protobuf::Metadata GeneratedCodeInfo::GetMetadata() const {
   protobuf_google_2fprotobuf_2fdescriptor_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[24];
+  return ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// GeneratedCodeInfo
 
-// repeated .google.protobuf.GeneratedCodeInfo.Annotation annotation = 1;
-int GeneratedCodeInfo::annotation_size() const {
-  return annotation_.size();
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FileDescriptorSet* Arena::CreateMaybeMessage< ::google::protobuf::FileDescriptorSet >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FileDescriptorSet >(arena);
 }
-void GeneratedCodeInfo::clear_annotation() {
-  annotation_.Clear();
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FileDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::FileDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FileDescriptorProto >(arena);
 }
-const ::google::protobuf::GeneratedCodeInfo_Annotation& GeneratedCodeInfo::annotation(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_.Get(index);
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::DescriptorProto_ExtensionRange* Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto_ExtensionRange >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto_ExtensionRange >(arena);
 }
-::google::protobuf::GeneratedCodeInfo_Annotation* GeneratedCodeInfo::mutable_annotation(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_.Mutable(index);
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::DescriptorProto_ReservedRange* Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto_ReservedRange >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto_ReservedRange >(arena);
 }
-::google::protobuf::GeneratedCodeInfo_Annotation* GeneratedCodeInfo::add_annotation() {
-  // @@protoc_insertion_point(field_add:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_.Add();
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::DescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto >(arena);
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >*
-GeneratedCodeInfo::mutable_annotation() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.GeneratedCodeInfo.annotation)
-  return &annotation_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::ExtensionRangeOptions* Arena::CreateMaybeMessage< ::google::protobuf::ExtensionRangeOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::ExtensionRangeOptions >(arena);
 }
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >&
-GeneratedCodeInfo::annotation() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FieldDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::FieldDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FieldDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::OneofDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::OneofDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::OneofDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumDescriptorProto_EnumReservedRange* Arena::CreateMaybeMessage< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::EnumDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumValueDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::EnumValueDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumValueDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::ServiceDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::ServiceDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::ServiceDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::MethodDescriptorProto* Arena::CreateMaybeMessage< ::google::protobuf::MethodDescriptorProto >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::MethodDescriptorProto >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FileOptions* Arena::CreateMaybeMessage< ::google::protobuf::FileOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FileOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::MessageOptions* Arena::CreateMaybeMessage< ::google::protobuf::MessageOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::MessageOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FieldOptions* Arena::CreateMaybeMessage< ::google::protobuf::FieldOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FieldOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::OneofOptions* Arena::CreateMaybeMessage< ::google::protobuf::OneofOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::OneofOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumOptions* Arena::CreateMaybeMessage< ::google::protobuf::EnumOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumValueOptions* Arena::CreateMaybeMessage< ::google::protobuf::EnumValueOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumValueOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::ServiceOptions* Arena::CreateMaybeMessage< ::google::protobuf::ServiceOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::ServiceOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::MethodOptions* Arena::CreateMaybeMessage< ::google::protobuf::MethodOptions >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::MethodOptions >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::UninterpretedOption_NamePart* Arena::CreateMaybeMessage< ::google::protobuf::UninterpretedOption_NamePart >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::UninterpretedOption_NamePart >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::UninterpretedOption* Arena::CreateMaybeMessage< ::google::protobuf::UninterpretedOption >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::UninterpretedOption >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::SourceCodeInfo_Location* Arena::CreateMaybeMessage< ::google::protobuf::SourceCodeInfo_Location >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::SourceCodeInfo_Location >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::SourceCodeInfo* Arena::CreateMaybeMessage< ::google::protobuf::SourceCodeInfo >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::SourceCodeInfo >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::GeneratedCodeInfo_Annotation* Arena::CreateMaybeMessage< ::google::protobuf::GeneratedCodeInfo_Annotation >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::GeneratedCodeInfo_Annotation >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::GeneratedCodeInfo* Arena::CreateMaybeMessage< ::google::protobuf::GeneratedCodeInfo >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::GeneratedCodeInfo >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/descriptor.pb.h b/src/google/protobuf/descriptor.pb.h
index 73b7a8dd..5e7a05d5 100644
--- a/src/google/protobuf/descriptor.pb.h
+++ b/src/google/protobuf/descriptor.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/descriptor.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fdescriptor_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fdescriptor_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fdescriptor_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fdescriptor_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,7 +22,9 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
@@ -30,6 +32,20 @@
 #include <google/protobuf/generated_enum_reflection.h>
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fdescriptor_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[27];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto
 namespace google {
 namespace protobuf {
 class DescriptorProto;
@@ -44,6 +60,9 @@ LIBPROTOBUF_EXPORT extern DescriptorProto_ReservedRangeDefaultTypeInternal _Desc
 class EnumDescriptorProto;
 class EnumDescriptorProtoDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern EnumDescriptorProtoDefaultTypeInternal _EnumDescriptorProto_default_instance_;
+class EnumDescriptorProto_EnumReservedRange;
+class EnumDescriptorProto_EnumReservedRangeDefaultTypeInternal;
+LIBPROTOBUF_EXPORT extern EnumDescriptorProto_EnumReservedRangeDefaultTypeInternal _EnumDescriptorProto_EnumReservedRange_default_instance_;
 class EnumOptions;
 class EnumOptionsDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern EnumOptionsDefaultTypeInternal _EnumOptions_default_instance_;
@@ -53,6 +72,9 @@ LIBPROTOBUF_EXPORT extern EnumValueDescriptorProtoDefaultTypeInternal _EnumValue
 class EnumValueOptions;
 class EnumValueOptionsDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern EnumValueOptionsDefaultTypeInternal _EnumValueOptions_default_instance_;
+class ExtensionRangeOptions;
+class ExtensionRangeOptionsDefaultTypeInternal;
+LIBPROTOBUF_EXPORT extern ExtensionRangeOptionsDefaultTypeInternal _ExtensionRangeOptions_default_instance_;
 class FieldDescriptorProto;
 class FieldDescriptorProtoDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern FieldDescriptorProtoDefaultTypeInternal _FieldDescriptorProto_default_instance_;
@@ -109,20 +131,39 @@ class UninterpretedOption_NamePartDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern UninterpretedOption_NamePartDefaultTypeInternal _UninterpretedOption_NamePart_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fdescriptor_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::DescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::DescriptorProto_ExtensionRange* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto_ExtensionRange>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::DescriptorProto_ReservedRange* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto_ReservedRange>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::EnumDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumDescriptorProto_EnumReservedRange* Arena::CreateMaybeMessage<::google::protobuf::EnumDescriptorProto_EnumReservedRange>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumOptions* Arena::CreateMaybeMessage<::google::protobuf::EnumOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumValueDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::EnumValueDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumValueOptions* Arena::CreateMaybeMessage<::google::protobuf::EnumValueOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::ExtensionRangeOptions* Arena::CreateMaybeMessage<::google::protobuf::ExtensionRangeOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FieldDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::FieldDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FieldOptions* Arena::CreateMaybeMessage<::google::protobuf::FieldOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FileDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::FileDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FileDescriptorSet* Arena::CreateMaybeMessage<::google::protobuf::FileDescriptorSet>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FileOptions* Arena::CreateMaybeMessage<::google::protobuf::FileOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::GeneratedCodeInfo* Arena::CreateMaybeMessage<::google::protobuf::GeneratedCodeInfo>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::GeneratedCodeInfo_Annotation* Arena::CreateMaybeMessage<::google::protobuf::GeneratedCodeInfo_Annotation>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::MessageOptions* Arena::CreateMaybeMessage<::google::protobuf::MessageOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::MethodDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::MethodDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::MethodOptions* Arena::CreateMaybeMessage<::google::protobuf::MethodOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::OneofDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::OneofDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::OneofOptions* Arena::CreateMaybeMessage<::google::protobuf::OneofOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::ServiceDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::ServiceDescriptorProto>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::ServiceOptions* Arena::CreateMaybeMessage<::google::protobuf::ServiceOptions>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::SourceCodeInfo* Arena::CreateMaybeMessage<::google::protobuf::SourceCodeInfo>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::SourceCodeInfo_Location* Arena::CreateMaybeMessage<::google::protobuf::SourceCodeInfo_Location>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::UninterpretedOption* Arena::CreateMaybeMessage<::google::protobuf::UninterpretedOption>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::UninterpretedOption_NamePart* Arena::CreateMaybeMessage<::google::protobuf::UninterpretedOption_NamePart>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 enum FieldDescriptorProto_Type {
   FieldDescriptorProto_Type_TYPE_DOUBLE = 1,
@@ -272,65 +313,96 @@ class LIBPROTOBUF_EXPORT FileDescriptorSet : public ::google::protobuf::Message
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FileDescriptorSet(FileDescriptorSet&& from) noexcept
+    : FileDescriptorSet() {
+    *this = ::std::move(from);
+  }
 
+  inline FileDescriptorSet& operator=(FileDescriptorSet&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FileDescriptorSet& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FileDescriptorSet* internal_default_instance() {
     return reinterpret_cast<const FileDescriptorSet*>(
                &_FileDescriptorSet_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
+  void UnsafeArenaSwap(FileDescriptorSet* other);
   void Swap(FileDescriptorSet* other);
+  friend void swap(FileDescriptorSet& a, FileDescriptorSet& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FileDescriptorSet* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FileDescriptorSet* New() const final {
+    return CreateMaybeMessage<FileDescriptorSet>(NULL);
+  }
 
-  FileDescriptorSet* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FileDescriptorSet* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FileDescriptorSet>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FileDescriptorSet& from);
   void MergeFrom(const FileDescriptorSet& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FileDescriptorSet* other);
+  protected:
+  explicit FileDescriptorSet(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -340,11 +412,11 @@ class LIBPROTOBUF_EXPORT FileDescriptorSet : public ::google::protobuf::Message
   int file_size() const;
   void clear_file();
   static const int kFileFieldNumber = 1;
-  const ::google::protobuf::FileDescriptorProto& file(int index) const;
   ::google::protobuf::FileDescriptorProto* mutable_file(int index);
-  ::google::protobuf::FileDescriptorProto* add_file();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
       mutable_file();
+  const ::google::protobuf::FileDescriptorProto& file(int index) const;
+  ::google::protobuf::FileDescriptorProto* add_file();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
       file() const;
 
@@ -352,10 +424,13 @@ class LIBPROTOBUF_EXPORT FileDescriptorSet : public ::google::protobuf::Message
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto > file_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -370,65 +445,96 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FileDescriptorProto(FileDescriptorProto&& from) noexcept
+    : FileDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline FileDescriptorProto& operator=(FileDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FileDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FileDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const FileDescriptorProto*>(
                &_FileDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
+  void UnsafeArenaSwap(FileDescriptorProto* other);
   void Swap(FileDescriptorProto* other);
+  friend void swap(FileDescriptorProto& a, FileDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FileDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FileDescriptorProto* New() const final {
+    return CreateMaybeMessage<FileDescriptorProto>(NULL);
+  }
 
-  FileDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FileDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FileDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FileDescriptorProto& from);
   void MergeFrom(const FileDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FileDescriptorProto* other);
+  protected:
+  explicit FileDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -456,39 +562,15 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   const ::google::protobuf::RepeatedPtrField< ::std::string>& dependency() const;
   ::google::protobuf::RepeatedPtrField< ::std::string>* mutable_dependency();
 
-  // repeated int32 public_dependency = 10;
-  int public_dependency_size() const;
-  void clear_public_dependency();
-  static const int kPublicDependencyFieldNumber = 10;
-  ::google::protobuf::int32 public_dependency(int index) const;
-  void set_public_dependency(int index, ::google::protobuf::int32 value);
-  void add_public_dependency(::google::protobuf::int32 value);
-  const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-      public_dependency() const;
-  ::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-      mutable_public_dependency();
-
-  // repeated int32 weak_dependency = 11;
-  int weak_dependency_size() const;
-  void clear_weak_dependency();
-  static const int kWeakDependencyFieldNumber = 11;
-  ::google::protobuf::int32 weak_dependency(int index) const;
-  void set_weak_dependency(int index, ::google::protobuf::int32 value);
-  void add_weak_dependency(::google::protobuf::int32 value);
-  const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
-      weak_dependency() const;
-  ::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
-      mutable_weak_dependency();
-
   // repeated .google.protobuf.DescriptorProto message_type = 4;
   int message_type_size() const;
   void clear_message_type();
   static const int kMessageTypeFieldNumber = 4;
-  const ::google::protobuf::DescriptorProto& message_type(int index) const;
   ::google::protobuf::DescriptorProto* mutable_message_type(int index);
-  ::google::protobuf::DescriptorProto* add_message_type();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
       mutable_message_type();
+  const ::google::protobuf::DescriptorProto& message_type(int index) const;
+  ::google::protobuf::DescriptorProto* add_message_type();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
       message_type() const;
 
@@ -496,11 +578,11 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   int enum_type_size() const;
   void clear_enum_type();
   static const int kEnumTypeFieldNumber = 5;
-  const ::google::protobuf::EnumDescriptorProto& enum_type(int index) const;
   ::google::protobuf::EnumDescriptorProto* mutable_enum_type(int index);
-  ::google::protobuf::EnumDescriptorProto* add_enum_type();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
       mutable_enum_type();
+  const ::google::protobuf::EnumDescriptorProto& enum_type(int index) const;
+  ::google::protobuf::EnumDescriptorProto* add_enum_type();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
       enum_type() const;
 
@@ -508,11 +590,11 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   int service_size() const;
   void clear_service();
   static const int kServiceFieldNumber = 6;
-  const ::google::protobuf::ServiceDescriptorProto& service(int index) const;
   ::google::protobuf::ServiceDescriptorProto* mutable_service(int index);
-  ::google::protobuf::ServiceDescriptorProto* add_service();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >*
       mutable_service();
+  const ::google::protobuf::ServiceDescriptorProto& service(int index) const;
+  ::google::protobuf::ServiceDescriptorProto* add_service();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >&
       service() const;
 
@@ -520,14 +602,38 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   int extension_size() const;
   void clear_extension();
   static const int kExtensionFieldNumber = 7;
-  const ::google::protobuf::FieldDescriptorProto& extension(int index) const;
   ::google::protobuf::FieldDescriptorProto* mutable_extension(int index);
-  ::google::protobuf::FieldDescriptorProto* add_extension();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
       mutable_extension();
+  const ::google::protobuf::FieldDescriptorProto& extension(int index) const;
+  ::google::protobuf::FieldDescriptorProto* add_extension();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
       extension() const;
 
+  // repeated int32 public_dependency = 10;
+  int public_dependency_size() const;
+  void clear_public_dependency();
+  static const int kPublicDependencyFieldNumber = 10;
+  ::google::protobuf::int32 public_dependency(int index) const;
+  void set_public_dependency(int index, ::google::protobuf::int32 value);
+  void add_public_dependency(::google::protobuf::int32 value);
+  const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
+      public_dependency() const;
+  ::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
+      mutable_public_dependency();
+
+  // repeated int32 weak_dependency = 11;
+  int weak_dependency_size() const;
+  void clear_weak_dependency();
+  static const int kWeakDependencyFieldNumber = 11;
+  ::google::protobuf::int32 weak_dependency(int index) const;
+  void set_weak_dependency(int index, ::google::protobuf::int32 value);
+  void add_weak_dependency(::google::protobuf::int32 value);
+  const ::google::protobuf::RepeatedField< ::google::protobuf::int32 >&
+      weak_dependency() const;
+  ::google::protobuf::RepeatedField< ::google::protobuf::int32 >*
+      mutable_weak_dependency();
+
   // optional string name = 1;
   bool has_name() const;
   void clear_name();
@@ -542,6 +648,15 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional string package = 2;
   bool has_package() const;
@@ -557,6 +672,15 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   ::std::string* mutable_package();
   ::std::string* release_package();
   void set_allocated_package(::std::string* package);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_package();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_package(
+      ::std::string* package);
 
   // optional string syntax = 12;
   bool has_syntax() const;
@@ -572,24 +696,45 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   ::std::string* mutable_syntax();
   ::std::string* release_syntax();
   void set_allocated_syntax(::std::string* syntax);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_syntax();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_syntax(
+      ::std::string* syntax);
 
   // optional .google.protobuf.FileOptions options = 8;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 8;
+  private:
+  const ::google::protobuf::FileOptions& _internal_options() const;
+  public:
   const ::google::protobuf::FileOptions& options() const;
-  ::google::protobuf::FileOptions* mutable_options();
   ::google::protobuf::FileOptions* release_options();
+  ::google::protobuf::FileOptions* mutable_options();
   void set_allocated_options(::google::protobuf::FileOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::FileOptions* options);
+  ::google::protobuf::FileOptions* unsafe_arena_release_options();
 
   // optional .google.protobuf.SourceCodeInfo source_code_info = 9;
   bool has_source_code_info() const;
   void clear_source_code_info();
   static const int kSourceCodeInfoFieldNumber = 9;
+  private:
+  const ::google::protobuf::SourceCodeInfo& _internal_source_code_info() const;
+  public:
   const ::google::protobuf::SourceCodeInfo& source_code_info() const;
-  ::google::protobuf::SourceCodeInfo* mutable_source_code_info();
   ::google::protobuf::SourceCodeInfo* release_source_code_info();
+  ::google::protobuf::SourceCodeInfo* mutable_source_code_info();
   void set_allocated_source_code_info(::google::protobuf::SourceCodeInfo* source_code_info);
+  void unsafe_arena_set_allocated_source_code_info(
+      ::google::protobuf::SourceCodeInfo* source_code_info);
+  ::google::protobuf::SourceCodeInfo* unsafe_arena_release_source_code_info();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.FileDescriptorProto)
  private:
@@ -605,21 +750,24 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
   void clear_has_syntax();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::std::string> dependency_;
-  ::google::protobuf::RepeatedField< ::google::protobuf::int32 > public_dependency_;
-  ::google::protobuf::RepeatedField< ::google::protobuf::int32 > weak_dependency_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto > message_type_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto > enum_type_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto > service_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto > extension_;
+  ::google::protobuf::RepeatedField< ::google::protobuf::int32 > public_dependency_;
+  ::google::protobuf::RepeatedField< ::google::protobuf::int32 > weak_dependency_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::internal::ArenaStringPtr package_;
   ::google::protobuf::internal::ArenaStringPtr syntax_;
   ::google::protobuf::FileOptions* options_;
   ::google::protobuf::SourceCodeInfo* source_code_info_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -634,70 +782,116 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ExtensionRange : public ::google::proto
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  DescriptorProto_ExtensionRange(DescriptorProto_ExtensionRange&& from) noexcept
+    : DescriptorProto_ExtensionRange() {
+    *this = ::std::move(from);
+  }
 
+  inline DescriptorProto_ExtensionRange& operator=(DescriptorProto_ExtensionRange&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const DescriptorProto_ExtensionRange& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const DescriptorProto_ExtensionRange* internal_default_instance() {
     return reinterpret_cast<const DescriptorProto_ExtensionRange*>(
                &_DescriptorProto_ExtensionRange_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
+  void UnsafeArenaSwap(DescriptorProto_ExtensionRange* other);
   void Swap(DescriptorProto_ExtensionRange* other);
+  friend void swap(DescriptorProto_ExtensionRange& a, DescriptorProto_ExtensionRange& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline DescriptorProto_ExtensionRange* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline DescriptorProto_ExtensionRange* New() const final {
+    return CreateMaybeMessage<DescriptorProto_ExtensionRange>(NULL);
+  }
 
-  DescriptorProto_ExtensionRange* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  DescriptorProto_ExtensionRange* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<DescriptorProto_ExtensionRange>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const DescriptorProto_ExtensionRange& from);
   void MergeFrom(const DescriptorProto_ExtensionRange& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(DescriptorProto_ExtensionRange* other);
+  protected:
+  explicit DescriptorProto_ExtensionRange(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
   // accessors -------------------------------------------------------
 
+  // optional .google.protobuf.ExtensionRangeOptions options = 3;
+  bool has_options() const;
+  void clear_options();
+  static const int kOptionsFieldNumber = 3;
+  private:
+  const ::google::protobuf::ExtensionRangeOptions& _internal_options() const;
+  public:
+  const ::google::protobuf::ExtensionRangeOptions& options() const;
+  ::google::protobuf::ExtensionRangeOptions* release_options();
+  ::google::protobuf::ExtensionRangeOptions* mutable_options();
+  void set_allocated_options(::google::protobuf::ExtensionRangeOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::ExtensionRangeOptions* options);
+  ::google::protobuf::ExtensionRangeOptions* unsafe_arena_release_options();
+
   // optional int32 start = 1;
   bool has_start() const;
   void clear_start();
@@ -718,13 +912,19 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ExtensionRange : public ::google::proto
   void clear_has_start();
   void set_has_end();
   void clear_has_end();
+  void set_has_options();
+  void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  ::google::protobuf::ExtensionRangeOptions* options_;
   ::google::protobuf::int32 start_;
   ::google::protobuf::int32 end_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -739,65 +939,96 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ReservedRange : public ::google::protob
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  DescriptorProto_ReservedRange(DescriptorProto_ReservedRange&& from) noexcept
+    : DescriptorProto_ReservedRange() {
+    *this = ::std::move(from);
+  }
 
+  inline DescriptorProto_ReservedRange& operator=(DescriptorProto_ReservedRange&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const DescriptorProto_ReservedRange& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const DescriptorProto_ReservedRange* internal_default_instance() {
     return reinterpret_cast<const DescriptorProto_ReservedRange*>(
                &_DescriptorProto_ReservedRange_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    3;
 
+  void UnsafeArenaSwap(DescriptorProto_ReservedRange* other);
   void Swap(DescriptorProto_ReservedRange* other);
+  friend void swap(DescriptorProto_ReservedRange& a, DescriptorProto_ReservedRange& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline DescriptorProto_ReservedRange* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline DescriptorProto_ReservedRange* New() const final {
+    return CreateMaybeMessage<DescriptorProto_ReservedRange>(NULL);
+  }
 
-  DescriptorProto_ReservedRange* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  DescriptorProto_ReservedRange* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<DescriptorProto_ReservedRange>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const DescriptorProto_ReservedRange& from);
   void MergeFrom(const DescriptorProto_ReservedRange& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(DescriptorProto_ReservedRange* other);
+  protected:
+  explicit DescriptorProto_ReservedRange(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -825,11 +1056,14 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ReservedRange : public ::google::protob
   void clear_has_end();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::int32 start_;
   ::google::protobuf::int32 end_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -844,65 +1078,96 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  DescriptorProto(DescriptorProto&& from) noexcept
+    : DescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline DescriptorProto& operator=(DescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const DescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const DescriptorProto* internal_default_instance() {
     return reinterpret_cast<const DescriptorProto*>(
                &_DescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    4;
 
+  void UnsafeArenaSwap(DescriptorProto* other);
   void Swap(DescriptorProto* other);
+  friend void swap(DescriptorProto& a, DescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline DescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline DescriptorProto* New() const final {
+    return CreateMaybeMessage<DescriptorProto>(NULL);
+  }
 
-  DescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  DescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<DescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const DescriptorProto& from);
   void MergeFrom(const DescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(DescriptorProto* other);
+  protected:
+  explicit DescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -915,35 +1180,23 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   int field_size() const;
   void clear_field();
   static const int kFieldFieldNumber = 2;
-  const ::google::protobuf::FieldDescriptorProto& field(int index) const;
   ::google::protobuf::FieldDescriptorProto* mutable_field(int index);
-  ::google::protobuf::FieldDescriptorProto* add_field();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
       mutable_field();
+  const ::google::protobuf::FieldDescriptorProto& field(int index) const;
+  ::google::protobuf::FieldDescriptorProto* add_field();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
       field() const;
 
-  // repeated .google.protobuf.FieldDescriptorProto extension = 6;
-  int extension_size() const;
-  void clear_extension();
-  static const int kExtensionFieldNumber = 6;
-  const ::google::protobuf::FieldDescriptorProto& extension(int index) const;
-  ::google::protobuf::FieldDescriptorProto* mutable_extension(int index);
-  ::google::protobuf::FieldDescriptorProto* add_extension();
-  ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
-      mutable_extension();
-  const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
-      extension() const;
-
   // repeated .google.protobuf.DescriptorProto nested_type = 3;
   int nested_type_size() const;
   void clear_nested_type();
   static const int kNestedTypeFieldNumber = 3;
-  const ::google::protobuf::DescriptorProto& nested_type(int index) const;
   ::google::protobuf::DescriptorProto* mutable_nested_type(int index);
-  ::google::protobuf::DescriptorProto* add_nested_type();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
       mutable_nested_type();
+  const ::google::protobuf::DescriptorProto& nested_type(int index) const;
+  ::google::protobuf::DescriptorProto* add_nested_type();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
       nested_type() const;
 
@@ -951,11 +1204,11 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   int enum_type_size() const;
   void clear_enum_type();
   static const int kEnumTypeFieldNumber = 4;
-  const ::google::protobuf::EnumDescriptorProto& enum_type(int index) const;
   ::google::protobuf::EnumDescriptorProto* mutable_enum_type(int index);
-  ::google::protobuf::EnumDescriptorProto* add_enum_type();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
       mutable_enum_type();
+  const ::google::protobuf::EnumDescriptorProto& enum_type(int index) const;
+  ::google::protobuf::EnumDescriptorProto* add_enum_type();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
       enum_type() const;
 
@@ -963,23 +1216,35 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   int extension_range_size() const;
   void clear_extension_range();
   static const int kExtensionRangeFieldNumber = 5;
-  const ::google::protobuf::DescriptorProto_ExtensionRange& extension_range(int index) const;
   ::google::protobuf::DescriptorProto_ExtensionRange* mutable_extension_range(int index);
-  ::google::protobuf::DescriptorProto_ExtensionRange* add_extension_range();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >*
       mutable_extension_range();
+  const ::google::protobuf::DescriptorProto_ExtensionRange& extension_range(int index) const;
+  ::google::protobuf::DescriptorProto_ExtensionRange* add_extension_range();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >&
       extension_range() const;
 
+  // repeated .google.protobuf.FieldDescriptorProto extension = 6;
+  int extension_size() const;
+  void clear_extension();
+  static const int kExtensionFieldNumber = 6;
+  ::google::protobuf::FieldDescriptorProto* mutable_extension(int index);
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
+      mutable_extension();
+  const ::google::protobuf::FieldDescriptorProto& extension(int index) const;
+  ::google::protobuf::FieldDescriptorProto* add_extension();
+  const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
+      extension() const;
+
   // repeated .google.protobuf.OneofDescriptorProto oneof_decl = 8;
   int oneof_decl_size() const;
   void clear_oneof_decl();
   static const int kOneofDeclFieldNumber = 8;
-  const ::google::protobuf::OneofDescriptorProto& oneof_decl(int index) const;
   ::google::protobuf::OneofDescriptorProto* mutable_oneof_decl(int index);
-  ::google::protobuf::OneofDescriptorProto* add_oneof_decl();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >*
       mutable_oneof_decl();
+  const ::google::protobuf::OneofDescriptorProto& oneof_decl(int index) const;
+  ::google::protobuf::OneofDescriptorProto* add_oneof_decl();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >&
       oneof_decl() const;
 
@@ -987,11 +1252,11 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   int reserved_range_size() const;
   void clear_reserved_range();
   static const int kReservedRangeFieldNumber = 9;
-  const ::google::protobuf::DescriptorProto_ReservedRange& reserved_range(int index) const;
   ::google::protobuf::DescriptorProto_ReservedRange* mutable_reserved_range(int index);
-  ::google::protobuf::DescriptorProto_ReservedRange* add_reserved_range();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >*
       mutable_reserved_range();
+  const ::google::protobuf::DescriptorProto_ReservedRange& reserved_range(int index) const;
+  ::google::protobuf::DescriptorProto_ReservedRange* add_reserved_range();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >&
       reserved_range() const;
 
@@ -1031,15 +1296,30 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional .google.protobuf.MessageOptions options = 7;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 7;
+  private:
+  const ::google::protobuf::MessageOptions& _internal_options() const;
+  public:
   const ::google::protobuf::MessageOptions& options() const;
-  ::google::protobuf::MessageOptions* mutable_options();
   ::google::protobuf::MessageOptions* release_options();
+  ::google::protobuf::MessageOptions* mutable_options();
   void set_allocated_options(::google::protobuf::MessageOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::MessageOptions* options);
+  ::google::protobuf::MessageOptions* unsafe_arena_release_options();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.DescriptorProto)
  private:
@@ -1049,19 +1329,157 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto > field_;
-  ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto > extension_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto > nested_type_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto > enum_type_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange > extension_range_;
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto > extension_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto > oneof_decl_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange > reserved_range_;
   ::google::protobuf::RepeatedPtrField< ::std::string> reserved_name_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::MessageOptions* options_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+};
+// -------------------------------------------------------------------
+
+class LIBPROTOBUF_EXPORT ExtensionRangeOptions : public ::google::protobuf::Message /* @@protoc_insertion_point(class_definition:google.protobuf.ExtensionRangeOptions) */ {
+ public:
+  ExtensionRangeOptions();
+  virtual ~ExtensionRangeOptions();
+
+  ExtensionRangeOptions(const ExtensionRangeOptions& from);
+
+  inline ExtensionRangeOptions& operator=(const ExtensionRangeOptions& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  #if LANG_CXX11
+  ExtensionRangeOptions(ExtensionRangeOptions&& from) noexcept
+    : ExtensionRangeOptions() {
+    *this = ::std::move(from);
+  }
+
+  inline ExtensionRangeOptions& operator=(ExtensionRangeOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
+    return _internal_metadata_.unknown_fields();
+  }
+  inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
+    return _internal_metadata_.mutable_unknown_fields();
+  }
+
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
+  static const ::google::protobuf::Descriptor* descriptor();
+  static const ExtensionRangeOptions& default_instance();
+
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
+  static inline const ExtensionRangeOptions* internal_default_instance() {
+    return reinterpret_cast<const ExtensionRangeOptions*>(
+               &_ExtensionRangeOptions_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    5;
+
+  void UnsafeArenaSwap(ExtensionRangeOptions* other);
+  void Swap(ExtensionRangeOptions* other);
+  friend void swap(ExtensionRangeOptions& a, ExtensionRangeOptions& b) {
+    a.Swap(&b);
+  }
+
+  // implements Message ----------------------------------------------
+
+  inline ExtensionRangeOptions* New() const final {
+    return CreateMaybeMessage<ExtensionRangeOptions>(NULL);
+  }
+
+  ExtensionRangeOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<ExtensionRangeOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
+  void CopyFrom(const ExtensionRangeOptions& from);
+  void MergeFrom(const ExtensionRangeOptions& from);
+  void Clear() final;
+  bool IsInitialized() const final;
+
+  size_t ByteSizeLong() const final;
+  bool MergePartialFromCodedStream(
+      ::google::protobuf::io::CodedInputStream* input) final;
+  void SerializeWithCachedSizes(
+      ::google::protobuf::io::CodedOutputStream* output) const final;
+  ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
+  private:
+  void SharedCtor();
+  void SharedDtor();
+  void SetCachedSize(int size) const final;
+  void InternalSwap(ExtensionRangeOptions* other);
+  protected:
+  explicit ExtensionRangeOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
+  private:
+  inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
+    return _internal_metadata_.arena();
+  }
+  inline void* MaybeArenaPtr() const {
+    return _internal_metadata_.raw_arena_ptr();
+  }
+  public:
+
+  ::google::protobuf::Metadata GetMetadata() const final;
+
+  // nested types ----------------------------------------------------
+
+  // accessors -------------------------------------------------------
+
+  // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+  int uninterpreted_option_size() const;
+  void clear_uninterpreted_option();
+  static const int kUninterpretedOptionFieldNumber = 999;
+  ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
+      mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
+  const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
+      uninterpreted_option() const;
+
+  GOOGLE_PROTOBUF_EXTENSION_ACCESSORS(ExtensionRangeOptions)
+  // @@protoc_insertion_point(class_scope:google.protobuf.ExtensionRangeOptions)
+ private:
+
+  ::google::protobuf::internal::ExtensionSet _extensions_;
+
+  ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  ::google::protobuf::internal::HasBits<1> _has_bits_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1076,65 +1494,96 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FieldDescriptorProto(FieldDescriptorProto&& from) noexcept
+    : FieldDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline FieldDescriptorProto& operator=(FieldDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FieldDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FieldDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const FieldDescriptorProto*>(
                &_FieldDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    6;
 
+  void UnsafeArenaSwap(FieldDescriptorProto* other);
   void Swap(FieldDescriptorProto* other);
+  friend void swap(FieldDescriptorProto& a, FieldDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FieldDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FieldDescriptorProto* New() const final {
+    return CreateMaybeMessage<FieldDescriptorProto>(NULL);
+  }
 
-  FieldDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FieldDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FieldDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FieldDescriptorProto& from);
   void MergeFrom(const FieldDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FieldDescriptorProto* other);
+  protected:
+  explicit FieldDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -1240,21 +1689,15 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
-
-  // optional string type_name = 6;
-  bool has_type_name() const;
-  void clear_type_name();
-  static const int kTypeNameFieldNumber = 6;
-  const ::std::string& type_name() const;
-  void set_type_name(const ::std::string& value);
-  #if LANG_CXX11
-  void set_type_name(::std::string&& value);
-  #endif
-  void set_type_name(const char* value);
-  void set_type_name(const char* value, size_t size);
-  ::std::string* mutable_type_name();
-  ::std::string* release_type_name();
-  void set_allocated_type_name(::std::string* type_name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional string extendee = 2;
   bool has_extendee() const;
@@ -1270,6 +1713,39 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   ::std::string* mutable_extendee();
   ::std::string* release_extendee();
   void set_allocated_extendee(::std::string* extendee);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_extendee();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_extendee(
+      ::std::string* extendee);
+
+  // optional string type_name = 6;
+  bool has_type_name() const;
+  void clear_type_name();
+  static const int kTypeNameFieldNumber = 6;
+  const ::std::string& type_name() const;
+  void set_type_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_type_name(::std::string&& value);
+  #endif
+  void set_type_name(const char* value);
+  void set_type_name(const char* value, size_t size);
+  ::std::string* mutable_type_name();
+  ::std::string* release_type_name();
+  void set_allocated_type_name(::std::string* type_name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_type_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_type_name(
+      ::std::string* type_name);
 
   // optional string default_value = 7;
   bool has_default_value() const;
@@ -1285,6 +1761,15 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   ::std::string* mutable_default_value();
   ::std::string* release_default_value();
   void set_allocated_default_value(::std::string* default_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_default_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_default_value(
+      ::std::string* default_value);
 
   // optional string json_name = 10;
   bool has_json_name() const;
@@ -1300,15 +1785,30 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   ::std::string* mutable_json_name();
   ::std::string* release_json_name();
   void set_allocated_json_name(::std::string* json_name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_json_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_json_name(
+      ::std::string* json_name);
 
   // optional .google.protobuf.FieldOptions options = 8;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 8;
+  private:
+  const ::google::protobuf::FieldOptions& _internal_options() const;
+  public:
   const ::google::protobuf::FieldOptions& options() const;
-  ::google::protobuf::FieldOptions* mutable_options();
   ::google::protobuf::FieldOptions* release_options();
+  ::google::protobuf::FieldOptions* mutable_options();
   void set_allocated_options(::google::protobuf::FieldOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::FieldOptions* options);
+  ::google::protobuf::FieldOptions* unsafe_arena_release_options();
 
   // optional int32 number = 3;
   bool has_number() const;
@@ -1362,11 +1862,14 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_;
-  ::google::protobuf::internal::ArenaStringPtr type_name_;
   ::google::protobuf::internal::ArenaStringPtr extendee_;
+  ::google::protobuf::internal::ArenaStringPtr type_name_;
   ::google::protobuf::internal::ArenaStringPtr default_value_;
   ::google::protobuf::internal::ArenaStringPtr json_name_;
   ::google::protobuf::FieldOptions* options_;
@@ -1374,7 +1877,7 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
   ::google::protobuf::int32 oneof_index_;
   int label_;
   int type_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1389,65 +1892,96 @@ class LIBPROTOBUF_EXPORT OneofDescriptorProto : public ::google::protobuf::Messa
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  OneofDescriptorProto(OneofDescriptorProto&& from) noexcept
+    : OneofDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline OneofDescriptorProto& operator=(OneofDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const OneofDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const OneofDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const OneofDescriptorProto*>(
                &_OneofDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    7;
 
+  void UnsafeArenaSwap(OneofDescriptorProto* other);
   void Swap(OneofDescriptorProto* other);
+  friend void swap(OneofDescriptorProto& a, OneofDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline OneofDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline OneofDescriptorProto* New() const final {
+    return CreateMaybeMessage<OneofDescriptorProto>(NULL);
+  }
 
-  OneofDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  OneofDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<OneofDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const OneofDescriptorProto& from);
   void MergeFrom(const OneofDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(OneofDescriptorProto* other);
+  protected:
+  explicit OneofDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -1467,15 +2001,30 @@ class LIBPROTOBUF_EXPORT OneofDescriptorProto : public ::google::protobuf::Messa
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional .google.protobuf.OneofOptions options = 2;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 2;
+  private:
+  const ::google::protobuf::OneofOptions& _internal_options() const;
+  public:
   const ::google::protobuf::OneofOptions& options() const;
-  ::google::protobuf::OneofOptions* mutable_options();
   ::google::protobuf::OneofOptions* release_options();
+  ::google::protobuf::OneofOptions* mutable_options();
   void set_allocated_options(::google::protobuf::OneofOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::OneofOptions* options);
+  ::google::protobuf::OneofOptions* unsafe_arena_release_options();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.OneofDescriptorProto)
  private:
@@ -1485,11 +2034,153 @@ class LIBPROTOBUF_EXPORT OneofDescriptorProto : public ::google::protobuf::Messa
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::OneofOptions* options_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+};
+// -------------------------------------------------------------------
+
+class LIBPROTOBUF_EXPORT EnumDescriptorProto_EnumReservedRange : public ::google::protobuf::Message /* @@protoc_insertion_point(class_definition:google.protobuf.EnumDescriptorProto.EnumReservedRange) */ {
+ public:
+  EnumDescriptorProto_EnumReservedRange();
+  virtual ~EnumDescriptorProto_EnumReservedRange();
+
+  EnumDescriptorProto_EnumReservedRange(const EnumDescriptorProto_EnumReservedRange& from);
+
+  inline EnumDescriptorProto_EnumReservedRange& operator=(const EnumDescriptorProto_EnumReservedRange& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  #if LANG_CXX11
+  EnumDescriptorProto_EnumReservedRange(EnumDescriptorProto_EnumReservedRange&& from) noexcept
+    : EnumDescriptorProto_EnumReservedRange() {
+    *this = ::std::move(from);
+  }
+
+  inline EnumDescriptorProto_EnumReservedRange& operator=(EnumDescriptorProto_EnumReservedRange&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
+    return _internal_metadata_.unknown_fields();
+  }
+  inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
+    return _internal_metadata_.mutable_unknown_fields();
+  }
+
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
+  static const ::google::protobuf::Descriptor* descriptor();
+  static const EnumDescriptorProto_EnumReservedRange& default_instance();
+
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
+  static inline const EnumDescriptorProto_EnumReservedRange* internal_default_instance() {
+    return reinterpret_cast<const EnumDescriptorProto_EnumReservedRange*>(
+               &_EnumDescriptorProto_EnumReservedRange_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    8;
+
+  void UnsafeArenaSwap(EnumDescriptorProto_EnumReservedRange* other);
+  void Swap(EnumDescriptorProto_EnumReservedRange* other);
+  friend void swap(EnumDescriptorProto_EnumReservedRange& a, EnumDescriptorProto_EnumReservedRange& b) {
+    a.Swap(&b);
+  }
+
+  // implements Message ----------------------------------------------
+
+  inline EnumDescriptorProto_EnumReservedRange* New() const final {
+    return CreateMaybeMessage<EnumDescriptorProto_EnumReservedRange>(NULL);
+  }
+
+  EnumDescriptorProto_EnumReservedRange* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumDescriptorProto_EnumReservedRange>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
+  void CopyFrom(const EnumDescriptorProto_EnumReservedRange& from);
+  void MergeFrom(const EnumDescriptorProto_EnumReservedRange& from);
+  void Clear() final;
+  bool IsInitialized() const final;
+
+  size_t ByteSizeLong() const final;
+  bool MergePartialFromCodedStream(
+      ::google::protobuf::io::CodedInputStream* input) final;
+  void SerializeWithCachedSizes(
+      ::google::protobuf::io::CodedOutputStream* output) const final;
+  ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
+  private:
+  void SharedCtor();
+  void SharedDtor();
+  void SetCachedSize(int size) const final;
+  void InternalSwap(EnumDescriptorProto_EnumReservedRange* other);
+  protected:
+  explicit EnumDescriptorProto_EnumReservedRange(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
+  private:
+  inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
+    return _internal_metadata_.arena();
+  }
+  inline void* MaybeArenaPtr() const {
+    return _internal_metadata_.raw_arena_ptr();
+  }
+  public:
+
+  ::google::protobuf::Metadata GetMetadata() const final;
+
+  // nested types ----------------------------------------------------
+
+  // accessors -------------------------------------------------------
+
+  // optional int32 start = 1;
+  bool has_start() const;
+  void clear_start();
+  static const int kStartFieldNumber = 1;
+  ::google::protobuf::int32 start() const;
+  void set_start(::google::protobuf::int32 value);
+
+  // optional int32 end = 2;
+  bool has_end() const;
+  void clear_end();
+  static const int kEndFieldNumber = 2;
+  ::google::protobuf::int32 end() const;
+  void set_end(::google::protobuf::int32 value);
+
+  // @@protoc_insertion_point(class_scope:google.protobuf.EnumDescriptorProto.EnumReservedRange)
+ private:
+  void set_has_start();
+  void clear_has_start();
+  void set_has_end();
+  void clear_has_end();
+
+  ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  ::google::protobuf::internal::HasBits<1> _has_bits_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  ::google::protobuf::int32 start_;
+  ::google::protobuf::int32 end_;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1504,82 +2195,149 @@ class LIBPROTOBUF_EXPORT EnumDescriptorProto : public ::google::protobuf::Messag
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  EnumDescriptorProto(EnumDescriptorProto&& from) noexcept
+    : EnumDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline EnumDescriptorProto& operator=(EnumDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const EnumDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const EnumDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const EnumDescriptorProto*>(
                &_EnumDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    9;
 
+  void UnsafeArenaSwap(EnumDescriptorProto* other);
   void Swap(EnumDescriptorProto* other);
+  friend void swap(EnumDescriptorProto& a, EnumDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline EnumDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline EnumDescriptorProto* New() const final {
+    return CreateMaybeMessage<EnumDescriptorProto>(NULL);
+  }
 
-  EnumDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  EnumDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const EnumDescriptorProto& from);
   void MergeFrom(const EnumDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(EnumDescriptorProto* other);
+  protected:
+  explicit EnumDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
+  typedef EnumDescriptorProto_EnumReservedRange EnumReservedRange;
+
   // accessors -------------------------------------------------------
 
   // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
   int value_size() const;
   void clear_value();
   static const int kValueFieldNumber = 2;
-  const ::google::protobuf::EnumValueDescriptorProto& value(int index) const;
   ::google::protobuf::EnumValueDescriptorProto* mutable_value(int index);
-  ::google::protobuf::EnumValueDescriptorProto* add_value();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >*
       mutable_value();
+  const ::google::protobuf::EnumValueDescriptorProto& value(int index) const;
+  ::google::protobuf::EnumValueDescriptorProto* add_value();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >&
       value() const;
 
+  // repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+  int reserved_range_size() const;
+  void clear_reserved_range();
+  static const int kReservedRangeFieldNumber = 4;
+  ::google::protobuf::EnumDescriptorProto_EnumReservedRange* mutable_reserved_range(int index);
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >*
+      mutable_reserved_range();
+  const ::google::protobuf::EnumDescriptorProto_EnumReservedRange& reserved_range(int index) const;
+  ::google::protobuf::EnumDescriptorProto_EnumReservedRange* add_reserved_range();
+  const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >&
+      reserved_range() const;
+
+  // repeated string reserved_name = 5;
+  int reserved_name_size() const;
+  void clear_reserved_name();
+  static const int kReservedNameFieldNumber = 5;
+  const ::std::string& reserved_name(int index) const;
+  ::std::string* mutable_reserved_name(int index);
+  void set_reserved_name(int index, const ::std::string& value);
+  #if LANG_CXX11
+  void set_reserved_name(int index, ::std::string&& value);
+  #endif
+  void set_reserved_name(int index, const char* value);
+  void set_reserved_name(int index, const char* value, size_t size);
+  ::std::string* add_reserved_name();
+  void add_reserved_name(const ::std::string& value);
+  #if LANG_CXX11
+  void add_reserved_name(::std::string&& value);
+  #endif
+  void add_reserved_name(const char* value);
+  void add_reserved_name(const char* value, size_t size);
+  const ::google::protobuf::RepeatedPtrField< ::std::string>& reserved_name() const;
+  ::google::protobuf::RepeatedPtrField< ::std::string>* mutable_reserved_name();
+
   // optional string name = 1;
   bool has_name() const;
   void clear_name();
@@ -1594,15 +2352,30 @@ class LIBPROTOBUF_EXPORT EnumDescriptorProto : public ::google::protobuf::Messag
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional .google.protobuf.EnumOptions options = 3;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
+  private:
+  const ::google::protobuf::EnumOptions& _internal_options() const;
+  public:
   const ::google::protobuf::EnumOptions& options() const;
-  ::google::protobuf::EnumOptions* mutable_options();
   ::google::protobuf::EnumOptions* release_options();
+  ::google::protobuf::EnumOptions* mutable_options();
   void set_allocated_options(::google::protobuf::EnumOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::EnumOptions* options);
+  ::google::protobuf::EnumOptions* unsafe_arena_release_options();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.EnumDescriptorProto)
  private:
@@ -1612,12 +2385,17 @@ class LIBPROTOBUF_EXPORT EnumDescriptorProto : public ::google::protobuf::Messag
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto > value_;
+  ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto_EnumReservedRange > reserved_range_;
+  ::google::protobuf::RepeatedPtrField< ::std::string> reserved_name_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::EnumOptions* options_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1632,65 +2410,96 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptorProto : public ::google::protobuf::M
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  EnumValueDescriptorProto(EnumValueDescriptorProto&& from) noexcept
+    : EnumValueDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline EnumValueDescriptorProto& operator=(EnumValueDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const EnumValueDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const EnumValueDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const EnumValueDescriptorProto*>(
                &_EnumValueDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    10;
 
+  void UnsafeArenaSwap(EnumValueDescriptorProto* other);
   void Swap(EnumValueDescriptorProto* other);
+  friend void swap(EnumValueDescriptorProto& a, EnumValueDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline EnumValueDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline EnumValueDescriptorProto* New() const final {
+    return CreateMaybeMessage<EnumValueDescriptorProto>(NULL);
+  }
 
-  EnumValueDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  EnumValueDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumValueDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const EnumValueDescriptorProto& from);
   void MergeFrom(const EnumValueDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(EnumValueDescriptorProto* other);
+  protected:
+  explicit EnumValueDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -1710,15 +2519,30 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptorProto : public ::google::protobuf::M
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional .google.protobuf.EnumValueOptions options = 3;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
+  private:
+  const ::google::protobuf::EnumValueOptions& _internal_options() const;
+  public:
   const ::google::protobuf::EnumValueOptions& options() const;
-  ::google::protobuf::EnumValueOptions* mutable_options();
   ::google::protobuf::EnumValueOptions* release_options();
+  ::google::protobuf::EnumValueOptions* mutable_options();
   void set_allocated_options(::google::protobuf::EnumValueOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::EnumValueOptions* options);
+  ::google::protobuf::EnumValueOptions* unsafe_arena_release_options();
 
   // optional int32 number = 2;
   bool has_number() const;
@@ -1737,12 +2561,15 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptorProto : public ::google::protobuf::M
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::EnumValueOptions* options_;
   ::google::protobuf::int32 number_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1757,65 +2584,96 @@ class LIBPROTOBUF_EXPORT ServiceDescriptorProto : public ::google::protobuf::Mes
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  ServiceDescriptorProto(ServiceDescriptorProto&& from) noexcept
+    : ServiceDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline ServiceDescriptorProto& operator=(ServiceDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const ServiceDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const ServiceDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const ServiceDescriptorProto*>(
                &_ServiceDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    11;
 
+  void UnsafeArenaSwap(ServiceDescriptorProto* other);
   void Swap(ServiceDescriptorProto* other);
+  friend void swap(ServiceDescriptorProto& a, ServiceDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline ServiceDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline ServiceDescriptorProto* New() const final {
+    return CreateMaybeMessage<ServiceDescriptorProto>(NULL);
+  }
 
-  ServiceDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  ServiceDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<ServiceDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const ServiceDescriptorProto& from);
   void MergeFrom(const ServiceDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(ServiceDescriptorProto* other);
+  protected:
+  explicit ServiceDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -1825,11 +2683,11 @@ class LIBPROTOBUF_EXPORT ServiceDescriptorProto : public ::google::protobuf::Mes
   int method_size() const;
   void clear_method();
   static const int kMethodFieldNumber = 2;
-  const ::google::protobuf::MethodDescriptorProto& method(int index) const;
   ::google::protobuf::MethodDescriptorProto* mutable_method(int index);
-  ::google::protobuf::MethodDescriptorProto* add_method();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >*
       mutable_method();
+  const ::google::protobuf::MethodDescriptorProto& method(int index) const;
+  ::google::protobuf::MethodDescriptorProto* add_method();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >&
       method() const;
 
@@ -1847,15 +2705,30 @@ class LIBPROTOBUF_EXPORT ServiceDescriptorProto : public ::google::protobuf::Mes
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional .google.protobuf.ServiceOptions options = 3;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
+  private:
+  const ::google::protobuf::ServiceOptions& _internal_options() const;
+  public:
   const ::google::protobuf::ServiceOptions& options() const;
-  ::google::protobuf::ServiceOptions* mutable_options();
   ::google::protobuf::ServiceOptions* release_options();
+  ::google::protobuf::ServiceOptions* mutable_options();
   void set_allocated_options(::google::protobuf::ServiceOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::ServiceOptions* options);
+  ::google::protobuf::ServiceOptions* unsafe_arena_release_options();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.ServiceDescriptorProto)
  private:
@@ -1865,12 +2738,15 @@ class LIBPROTOBUF_EXPORT ServiceDescriptorProto : public ::google::protobuf::Mes
   void clear_has_options();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto > method_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::ServiceOptions* options_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -1885,65 +2761,96 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  MethodDescriptorProto(MethodDescriptorProto&& from) noexcept
+    : MethodDescriptorProto() {
+    *this = ::std::move(from);
+  }
 
+  inline MethodDescriptorProto& operator=(MethodDescriptorProto&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const MethodDescriptorProto& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const MethodDescriptorProto* internal_default_instance() {
     return reinterpret_cast<const MethodDescriptorProto*>(
                &_MethodDescriptorProto_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    12;
 
+  void UnsafeArenaSwap(MethodDescriptorProto* other);
   void Swap(MethodDescriptorProto* other);
+  friend void swap(MethodDescriptorProto& a, MethodDescriptorProto& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline MethodDescriptorProto* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline MethodDescriptorProto* New() const final {
+    return CreateMaybeMessage<MethodDescriptorProto>(NULL);
+  }
 
-  MethodDescriptorProto* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  MethodDescriptorProto* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<MethodDescriptorProto>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const MethodDescriptorProto& from);
   void MergeFrom(const MethodDescriptorProto& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(MethodDescriptorProto* other);
+  protected:
+  explicit MethodDescriptorProto(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -1963,6 +2870,15 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name(
+      ::std::string* name);
 
   // optional string input_type = 2;
   bool has_input_type() const;
@@ -1978,6 +2894,15 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
   ::std::string* mutable_input_type();
   ::std::string* release_input_type();
   void set_allocated_input_type(::std::string* input_type);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_input_type();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_input_type(
+      ::std::string* input_type);
 
   // optional string output_type = 3;
   bool has_output_type() const;
@@ -1993,15 +2918,30 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
   ::std::string* mutable_output_type();
   ::std::string* release_output_type();
   void set_allocated_output_type(::std::string* output_type);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_output_type();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_output_type(
+      ::std::string* output_type);
 
   // optional .google.protobuf.MethodOptions options = 4;
   bool has_options() const;
   void clear_options();
   static const int kOptionsFieldNumber = 4;
+  private:
+  const ::google::protobuf::MethodOptions& _internal_options() const;
+  public:
   const ::google::protobuf::MethodOptions& options() const;
-  ::google::protobuf::MethodOptions* mutable_options();
   ::google::protobuf::MethodOptions* release_options();
+  ::google::protobuf::MethodOptions* mutable_options();
   void set_allocated_options(::google::protobuf::MethodOptions* options);
+  void unsafe_arena_set_allocated_options(
+      ::google::protobuf::MethodOptions* options);
+  ::google::protobuf::MethodOptions* unsafe_arena_release_options();
 
   // optional bool client_streaming = 5 [default = false];
   bool has_client_streaming() const;
@@ -2033,15 +2973,18 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
   void clear_has_server_streaming();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::internal::ArenaStringPtr input_type_;
   ::google::protobuf::internal::ArenaStringPtr output_type_;
   ::google::protobuf::MethodOptions* options_;
   bool client_streaming_;
   bool server_streaming_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2056,65 +2999,96 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FileOptions(FileOptions&& from) noexcept
+    : FileOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline FileOptions& operator=(FileOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FileOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FileOptions* internal_default_instance() {
     return reinterpret_cast<const FileOptions*>(
                &_FileOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    13;
 
+  void UnsafeArenaSwap(FileOptions* other);
   void Swap(FileOptions* other);
+  friend void swap(FileOptions& a, FileOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FileOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FileOptions* New() const final {
+    return CreateMaybeMessage<FileOptions>(NULL);
+  }
 
-  FileOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FileOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FileOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FileOptions& from);
   void MergeFrom(const FileOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FileOptions* other);
+  protected:
+  explicit FileOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -2152,11 +3126,11 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -2174,6 +3148,15 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_java_package();
   ::std::string* release_java_package();
   void set_allocated_java_package(::std::string* java_package);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_java_package();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_java_package(
+      ::std::string* java_package);
 
   // optional string java_outer_classname = 8;
   bool has_java_outer_classname() const;
@@ -2189,6 +3172,15 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_java_outer_classname();
   ::std::string* release_java_outer_classname();
   void set_allocated_java_outer_classname(::std::string* java_outer_classname);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_java_outer_classname();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_java_outer_classname(
+      ::std::string* java_outer_classname);
 
   // optional string go_package = 11;
   bool has_go_package() const;
@@ -2204,6 +3196,15 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_go_package();
   ::std::string* release_go_package();
   void set_allocated_go_package(::std::string* go_package);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_go_package();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_go_package(
+      ::std::string* go_package);
 
   // optional string objc_class_prefix = 36;
   bool has_objc_class_prefix() const;
@@ -2219,6 +3220,15 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_objc_class_prefix();
   ::std::string* release_objc_class_prefix();
   void set_allocated_objc_class_prefix(::std::string* objc_class_prefix);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_objc_class_prefix();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_objc_class_prefix(
+      ::std::string* objc_class_prefix);
 
   // optional string csharp_namespace = 37;
   bool has_csharp_namespace() const;
@@ -2234,6 +3244,15 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_csharp_namespace();
   ::std::string* release_csharp_namespace();
   void set_allocated_csharp_namespace(::std::string* csharp_namespace);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_csharp_namespace();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_csharp_namespace(
+      ::std::string* csharp_namespace);
 
   // optional string swift_prefix = 39;
   bool has_swift_prefix() const;
@@ -2249,6 +3268,111 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::std::string* mutable_swift_prefix();
   ::std::string* release_swift_prefix();
   void set_allocated_swift_prefix(::std::string* swift_prefix);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_swift_prefix();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_swift_prefix(
+      ::std::string* swift_prefix);
+
+  // optional string php_class_prefix = 40;
+  bool has_php_class_prefix() const;
+  void clear_php_class_prefix();
+  static const int kPhpClassPrefixFieldNumber = 40;
+  const ::std::string& php_class_prefix() const;
+  void set_php_class_prefix(const ::std::string& value);
+  #if LANG_CXX11
+  void set_php_class_prefix(::std::string&& value);
+  #endif
+  void set_php_class_prefix(const char* value);
+  void set_php_class_prefix(const char* value, size_t size);
+  ::std::string* mutable_php_class_prefix();
+  ::std::string* release_php_class_prefix();
+  void set_allocated_php_class_prefix(::std::string* php_class_prefix);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_php_class_prefix();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_php_class_prefix(
+      ::std::string* php_class_prefix);
+
+  // optional string php_namespace = 41;
+  bool has_php_namespace() const;
+  void clear_php_namespace();
+  static const int kPhpNamespaceFieldNumber = 41;
+  const ::std::string& php_namespace() const;
+  void set_php_namespace(const ::std::string& value);
+  #if LANG_CXX11
+  void set_php_namespace(::std::string&& value);
+  #endif
+  void set_php_namespace(const char* value);
+  void set_php_namespace(const char* value, size_t size);
+  ::std::string* mutable_php_namespace();
+  ::std::string* release_php_namespace();
+  void set_allocated_php_namespace(::std::string* php_namespace);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_php_namespace();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_php_namespace(
+      ::std::string* php_namespace);
+
+  // optional string php_metadata_namespace = 44;
+  bool has_php_metadata_namespace() const;
+  void clear_php_metadata_namespace();
+  static const int kPhpMetadataNamespaceFieldNumber = 44;
+  const ::std::string& php_metadata_namespace() const;
+  void set_php_metadata_namespace(const ::std::string& value);
+  #if LANG_CXX11
+  void set_php_metadata_namespace(::std::string&& value);
+  #endif
+  void set_php_metadata_namespace(const char* value);
+  void set_php_metadata_namespace(const char* value, size_t size);
+  ::std::string* mutable_php_metadata_namespace();
+  ::std::string* release_php_metadata_namespace();
+  void set_allocated_php_metadata_namespace(::std::string* php_metadata_namespace);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_php_metadata_namespace();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_php_metadata_namespace(
+      ::std::string* php_metadata_namespace);
+
+  // optional string ruby_package = 45;
+  bool has_ruby_package() const;
+  void clear_ruby_package();
+  static const int kRubyPackageFieldNumber = 45;
+  const ::std::string& ruby_package() const;
+  void set_ruby_package(const ::std::string& value);
+  #if LANG_CXX11
+  void set_ruby_package(::std::string&& value);
+  #endif
+  void set_ruby_package(const char* value);
+  void set_ruby_package(const char* value, size_t size);
+  ::std::string* mutable_ruby_package();
+  ::std::string* release_ruby_package();
+  void set_allocated_ruby_package(::std::string* ruby_package);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_ruby_package();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_ruby_package(
+      ::std::string* ruby_package);
 
   // optional bool java_multiple_files = 10 [default = false];
   bool has_java_multiple_files() const;
@@ -2292,6 +3416,13 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   bool py_generic_services() const;
   void set_py_generic_services(bool value);
 
+  // optional bool php_generic_services = 42 [default = false];
+  bool has_php_generic_services() const;
+  void clear_php_generic_services();
+  static const int kPhpGenericServicesFieldNumber = 42;
+  bool php_generic_services() const;
+  void set_php_generic_services(bool value);
+
   // optional bool deprecated = 23 [default = false];
   bool has_deprecated() const;
   void clear_deprecated();
@@ -2336,6 +3467,8 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   void clear_has_java_generic_services();
   void set_has_py_generic_services();
   void clear_has_py_generic_services();
+  void set_has_php_generic_services();
+  void clear_has_php_generic_services();
   void set_has_deprecated();
   void clear_has_deprecated();
   void set_has_cc_enable_arenas();
@@ -2346,12 +3479,23 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   void clear_has_csharp_namespace();
   void set_has_swift_prefix();
   void clear_has_swift_prefix();
+  void set_has_php_class_prefix();
+  void clear_has_php_class_prefix();
+  void set_has_php_namespace();
+  void clear_has_php_namespace();
+  void set_has_php_metadata_namespace();
+  void clear_has_php_metadata_namespace();
+  void set_has_ruby_package();
+  void clear_has_ruby_package();
 
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   ::google::protobuf::internal::ArenaStringPtr java_package_;
   ::google::protobuf::internal::ArenaStringPtr java_outer_classname_;
@@ -2359,16 +3503,21 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
   ::google::protobuf::internal::ArenaStringPtr objc_class_prefix_;
   ::google::protobuf::internal::ArenaStringPtr csharp_namespace_;
   ::google::protobuf::internal::ArenaStringPtr swift_prefix_;
+  ::google::protobuf::internal::ArenaStringPtr php_class_prefix_;
+  ::google::protobuf::internal::ArenaStringPtr php_namespace_;
+  ::google::protobuf::internal::ArenaStringPtr php_metadata_namespace_;
+  ::google::protobuf::internal::ArenaStringPtr ruby_package_;
   bool java_multiple_files_;
   bool java_generate_equals_and_hash_;
   bool java_string_check_utf8_;
   bool cc_generic_services_;
   bool java_generic_services_;
   bool py_generic_services_;
+  bool php_generic_services_;
   bool deprecated_;
   bool cc_enable_arenas_;
   int optimize_for_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2383,65 +3532,96 @@ class LIBPROTOBUF_EXPORT MessageOptions : public ::google::protobuf::Message /*
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  MessageOptions(MessageOptions&& from) noexcept
+    : MessageOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline MessageOptions& operator=(MessageOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const MessageOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const MessageOptions* internal_default_instance() {
     return reinterpret_cast<const MessageOptions*>(
                &_MessageOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    14;
 
+  void UnsafeArenaSwap(MessageOptions* other);
   void Swap(MessageOptions* other);
+  friend void swap(MessageOptions& a, MessageOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline MessageOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline MessageOptions* New() const final {
+    return CreateMaybeMessage<MessageOptions>(NULL);
+  }
 
-  MessageOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  MessageOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<MessageOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const MessageOptions& from);
   void MergeFrom(const MessageOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(MessageOptions* other);
+  protected:
+  explicit MessageOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -2451,11 +3631,11 @@ class LIBPROTOBUF_EXPORT MessageOptions : public ::google::protobuf::Message /*
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -2502,14 +3682,17 @@ class LIBPROTOBUF_EXPORT MessageOptions : public ::google::protobuf::Message /*
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   bool message_set_wire_format_;
   bool no_standard_descriptor_accessor_;
   bool deprecated_;
   bool map_entry_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2524,65 +3707,96 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FieldOptions(FieldOptions&& from) noexcept
+    : FieldOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline FieldOptions& operator=(FieldOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FieldOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FieldOptions* internal_default_instance() {
     return reinterpret_cast<const FieldOptions*>(
                &_FieldOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    15;
 
+  void UnsafeArenaSwap(FieldOptions* other);
   void Swap(FieldOptions* other);
+  friend void swap(FieldOptions& a, FieldOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FieldOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FieldOptions* New() const final {
+    return CreateMaybeMessage<FieldOptions>(NULL);
+  }
 
-  FieldOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FieldOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FieldOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FieldOptions& from);
   void MergeFrom(const FieldOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FieldOptions* other);
+  protected:
+  explicit FieldOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -2648,11 +3862,11 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -2663,13 +3877,6 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
   ::google::protobuf::FieldOptions_CType ctype() const;
   void set_ctype(::google::protobuf::FieldOptions_CType value);
 
-  // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
-  bool has_jstype() const;
-  void clear_jstype();
-  static const int kJstypeFieldNumber = 6;
-  ::google::protobuf::FieldOptions_JSType jstype() const;
-  void set_jstype(::google::protobuf::FieldOptions_JSType value);
-
   // optional bool packed = 2;
   bool has_packed() const;
   void clear_packed();
@@ -2698,6 +3905,13 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
   bool weak() const;
   void set_weak(bool value);
 
+  // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
+  bool has_jstype() const;
+  void clear_jstype();
+  static const int kJstypeFieldNumber = 6;
+  ::google::protobuf::FieldOptions_JSType jstype() const;
+  void set_jstype(::google::protobuf::FieldOptions_JSType value);
+
   GOOGLE_PROTOBUF_EXTENSION_ACCESSORS(FieldOptions)
   // @@protoc_insertion_point(class_scope:google.protobuf.FieldOptions)
  private:
@@ -2717,16 +3931,19 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   int ctype_;
-  int jstype_;
   bool packed_;
   bool lazy_;
   bool deprecated_;
   bool weak_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  int jstype_;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2741,65 +3958,96 @@ class LIBPROTOBUF_EXPORT OneofOptions : public ::google::protobuf::Message /* @@
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  OneofOptions(OneofOptions&& from) noexcept
+    : OneofOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline OneofOptions& operator=(OneofOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const OneofOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const OneofOptions* internal_default_instance() {
     return reinterpret_cast<const OneofOptions*>(
                &_OneofOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    16;
 
+  void UnsafeArenaSwap(OneofOptions* other);
   void Swap(OneofOptions* other);
+  friend void swap(OneofOptions& a, OneofOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline OneofOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline OneofOptions* New() const final {
+    return CreateMaybeMessage<OneofOptions>(NULL);
+  }
 
-  OneofOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  OneofOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<OneofOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const OneofOptions& from);
   void MergeFrom(const OneofOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(OneofOptions* other);
+  protected:
+  explicit OneofOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -2809,11 +4057,11 @@ class LIBPROTOBUF_EXPORT OneofOptions : public ::google::protobuf::Message /* @@
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -2824,10 +4072,13 @@ class LIBPROTOBUF_EXPORT OneofOptions : public ::google::protobuf::Message /* @@
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2842,65 +4093,96 @@ class LIBPROTOBUF_EXPORT EnumOptions : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  EnumOptions(EnumOptions&& from) noexcept
+    : EnumOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline EnumOptions& operator=(EnumOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const EnumOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const EnumOptions* internal_default_instance() {
     return reinterpret_cast<const EnumOptions*>(
                &_EnumOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    17;
 
+  void UnsafeArenaSwap(EnumOptions* other);
   void Swap(EnumOptions* other);
+  friend void swap(EnumOptions& a, EnumOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline EnumOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline EnumOptions* New() const final {
+    return CreateMaybeMessage<EnumOptions>(NULL);
+  }
 
-  EnumOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  EnumOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const EnumOptions& from);
   void MergeFrom(const EnumOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(EnumOptions* other);
+  protected:
+  explicit EnumOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -2910,11 +4192,11 @@ class LIBPROTOBUF_EXPORT EnumOptions : public ::google::protobuf::Message /* @@p
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -2943,12 +4225,15 @@ class LIBPROTOBUF_EXPORT EnumOptions : public ::google::protobuf::Message /* @@p
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   bool allow_alias_;
   bool deprecated_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -2963,65 +4248,96 @@ class LIBPROTOBUF_EXPORT EnumValueOptions : public ::google::protobuf::Message /
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  EnumValueOptions(EnumValueOptions&& from) noexcept
+    : EnumValueOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline EnumValueOptions& operator=(EnumValueOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const EnumValueOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const EnumValueOptions* internal_default_instance() {
     return reinterpret_cast<const EnumValueOptions*>(
                &_EnumValueOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    18;
 
+  void UnsafeArenaSwap(EnumValueOptions* other);
   void Swap(EnumValueOptions* other);
+  friend void swap(EnumValueOptions& a, EnumValueOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline EnumValueOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline EnumValueOptions* New() const final {
+    return CreateMaybeMessage<EnumValueOptions>(NULL);
+  }
 
-  EnumValueOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  EnumValueOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumValueOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const EnumValueOptions& from);
   void MergeFrom(const EnumValueOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(EnumValueOptions* other);
+  protected:
+  explicit EnumValueOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3031,11 +4347,11 @@ class LIBPROTOBUF_EXPORT EnumValueOptions : public ::google::protobuf::Message /
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -3055,11 +4371,14 @@ class LIBPROTOBUF_EXPORT EnumValueOptions : public ::google::protobuf::Message /
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   bool deprecated_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3074,65 +4393,96 @@ class LIBPROTOBUF_EXPORT ServiceOptions : public ::google::protobuf::Message /*
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  ServiceOptions(ServiceOptions&& from) noexcept
+    : ServiceOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline ServiceOptions& operator=(ServiceOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const ServiceOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const ServiceOptions* internal_default_instance() {
     return reinterpret_cast<const ServiceOptions*>(
                &_ServiceOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    19;
 
+  void UnsafeArenaSwap(ServiceOptions* other);
   void Swap(ServiceOptions* other);
+  friend void swap(ServiceOptions& a, ServiceOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline ServiceOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline ServiceOptions* New() const final {
+    return CreateMaybeMessage<ServiceOptions>(NULL);
+  }
 
-  ServiceOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  ServiceOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<ServiceOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const ServiceOptions& from);
   void MergeFrom(const ServiceOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(ServiceOptions* other);
+  protected:
+  explicit ServiceOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3142,11 +4492,11 @@ class LIBPROTOBUF_EXPORT ServiceOptions : public ::google::protobuf::Message /*
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -3166,11 +4516,14 @@ class LIBPROTOBUF_EXPORT ServiceOptions : public ::google::protobuf::Message /*
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   bool deprecated_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3185,65 +4538,96 @@ class LIBPROTOBUF_EXPORT MethodOptions : public ::google::protobuf::Message /* @
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  MethodOptions(MethodOptions&& from) noexcept
+    : MethodOptions() {
+    *this = ::std::move(from);
+  }
 
+  inline MethodOptions& operator=(MethodOptions&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const MethodOptions& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const MethodOptions* internal_default_instance() {
     return reinterpret_cast<const MethodOptions*>(
                &_MethodOptions_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    20;
 
+  void UnsafeArenaSwap(MethodOptions* other);
   void Swap(MethodOptions* other);
+  friend void swap(MethodOptions& a, MethodOptions& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline MethodOptions* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline MethodOptions* New() const final {
+    return CreateMaybeMessage<MethodOptions>(NULL);
+  }
 
-  MethodOptions* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  MethodOptions* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<MethodOptions>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const MethodOptions& from);
   void MergeFrom(const MethodOptions& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(MethodOptions* other);
+  protected:
+  explicit MethodOptions(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3281,11 +4665,11 @@ class LIBPROTOBUF_EXPORT MethodOptions : public ::google::protobuf::Message /* @
   int uninterpreted_option_size() const;
   void clear_uninterpreted_option();
   static const int kUninterpretedOptionFieldNumber = 999;
-  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
   ::google::protobuf::UninterpretedOption* mutable_uninterpreted_option(int index);
-  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
       mutable_uninterpreted_option();
+  const ::google::protobuf::UninterpretedOption& uninterpreted_option(int index) const;
+  ::google::protobuf::UninterpretedOption* add_uninterpreted_option();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
       uninterpreted_option() const;
 
@@ -3314,12 +4698,15 @@ class LIBPROTOBUF_EXPORT MethodOptions : public ::google::protobuf::Message /* @
   ::google::protobuf::internal::ExtensionSet _extensions_;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption > uninterpreted_option_;
   bool deprecated_;
   int idempotency_level_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3334,65 +4721,96 @@ class LIBPROTOBUF_EXPORT UninterpretedOption_NamePart : public ::google::protobu
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  UninterpretedOption_NamePart(UninterpretedOption_NamePart&& from) noexcept
+    : UninterpretedOption_NamePart() {
+    *this = ::std::move(from);
+  }
 
+  inline UninterpretedOption_NamePart& operator=(UninterpretedOption_NamePart&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const UninterpretedOption_NamePart& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const UninterpretedOption_NamePart* internal_default_instance() {
     return reinterpret_cast<const UninterpretedOption_NamePart*>(
                &_UninterpretedOption_NamePart_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    21;
 
+  void UnsafeArenaSwap(UninterpretedOption_NamePart* other);
   void Swap(UninterpretedOption_NamePart* other);
+  friend void swap(UninterpretedOption_NamePart& a, UninterpretedOption_NamePart& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline UninterpretedOption_NamePart* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline UninterpretedOption_NamePart* New() const final {
+    return CreateMaybeMessage<UninterpretedOption_NamePart>(NULL);
+  }
 
-  UninterpretedOption_NamePart* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  UninterpretedOption_NamePart* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<UninterpretedOption_NamePart>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const UninterpretedOption_NamePart& from);
   void MergeFrom(const UninterpretedOption_NamePart& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(UninterpretedOption_NamePart* other);
+  protected:
+  explicit UninterpretedOption_NamePart(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3412,6 +4830,15 @@ class LIBPROTOBUF_EXPORT UninterpretedOption_NamePart : public ::google::protobu
   ::std::string* mutable_name_part();
   ::std::string* release_name_part();
   void set_allocated_name_part(::std::string* name_part);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_name_part();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_name_part(
+      ::std::string* name_part);
 
   // required bool is_extension = 2;
   bool has_is_extension() const;
@@ -3431,11 +4858,14 @@ class LIBPROTOBUF_EXPORT UninterpretedOption_NamePart : public ::google::protobu
   size_t RequiredFieldsByteSizeFallback() const;
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::internal::ArenaStringPtr name_part_;
   bool is_extension_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3450,65 +4880,96 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  UninterpretedOption(UninterpretedOption&& from) noexcept
+    : UninterpretedOption() {
+    *this = ::std::move(from);
+  }
 
+  inline UninterpretedOption& operator=(UninterpretedOption&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const UninterpretedOption& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const UninterpretedOption* internal_default_instance() {
     return reinterpret_cast<const UninterpretedOption*>(
                &_UninterpretedOption_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    22;
 
+  void UnsafeArenaSwap(UninterpretedOption* other);
   void Swap(UninterpretedOption* other);
+  friend void swap(UninterpretedOption& a, UninterpretedOption& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline UninterpretedOption* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline UninterpretedOption* New() const final {
+    return CreateMaybeMessage<UninterpretedOption>(NULL);
+  }
 
-  UninterpretedOption* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  UninterpretedOption* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<UninterpretedOption>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const UninterpretedOption& from);
   void MergeFrom(const UninterpretedOption& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(UninterpretedOption* other);
+  protected:
+  explicit UninterpretedOption(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3520,11 +4981,11 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   int name_size() const;
   void clear_name();
   static const int kNameFieldNumber = 2;
-  const ::google::protobuf::UninterpretedOption_NamePart& name(int index) const;
   ::google::protobuf::UninterpretedOption_NamePart* mutable_name(int index);
-  ::google::protobuf::UninterpretedOption_NamePart* add_name();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >*
       mutable_name();
+  const ::google::protobuf::UninterpretedOption_NamePart& name(int index) const;
+  ::google::protobuf::UninterpretedOption_NamePart* add_name();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >&
       name() const;
 
@@ -3542,6 +5003,15 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   ::std::string* mutable_identifier_value();
   ::std::string* release_identifier_value();
   void set_allocated_identifier_value(::std::string* identifier_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_identifier_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_identifier_value(
+      ::std::string* identifier_value);
 
   // optional bytes string_value = 7;
   bool has_string_value() const;
@@ -3557,6 +5027,15 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   ::std::string* mutable_string_value();
   ::std::string* release_string_value();
   void set_allocated_string_value(::std::string* string_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_string_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_string_value(
+      ::std::string* string_value);
 
   // optional string aggregate_value = 8;
   bool has_aggregate_value() const;
@@ -3572,6 +5051,15 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   ::std::string* mutable_aggregate_value();
   ::std::string* release_aggregate_value();
   void set_allocated_aggregate_value(::std::string* aggregate_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_aggregate_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_aggregate_value(
+      ::std::string* aggregate_value);
 
   // optional uint64 positive_int_value = 4;
   bool has_positive_int_value() const;
@@ -3610,8 +5098,11 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   void clear_has_aggregate_value();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart > name_;
   ::google::protobuf::internal::ArenaStringPtr identifier_value_;
   ::google::protobuf::internal::ArenaStringPtr string_value_;
@@ -3619,7 +5110,7 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
   ::google::protobuf::uint64 positive_int_value_;
   ::google::protobuf::int64 negative_int_value_;
   double double_value_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3634,65 +5125,96 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  SourceCodeInfo_Location(SourceCodeInfo_Location&& from) noexcept
+    : SourceCodeInfo_Location() {
+    *this = ::std::move(from);
+  }
 
+  inline SourceCodeInfo_Location& operator=(SourceCodeInfo_Location&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const SourceCodeInfo_Location& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const SourceCodeInfo_Location* internal_default_instance() {
     return reinterpret_cast<const SourceCodeInfo_Location*>(
                &_SourceCodeInfo_Location_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    23;
 
+  void UnsafeArenaSwap(SourceCodeInfo_Location* other);
   void Swap(SourceCodeInfo_Location* other);
+  friend void swap(SourceCodeInfo_Location& a, SourceCodeInfo_Location& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline SourceCodeInfo_Location* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline SourceCodeInfo_Location* New() const final {
+    return CreateMaybeMessage<SourceCodeInfo_Location>(NULL);
+  }
 
-  SourceCodeInfo_Location* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  SourceCodeInfo_Location* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<SourceCodeInfo_Location>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const SourceCodeInfo_Location& from);
   void MergeFrom(const SourceCodeInfo_Location& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(SourceCodeInfo_Location* other);
+  protected:
+  explicit SourceCodeInfo_Location(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3758,6 +5280,15 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
   ::std::string* mutable_leading_comments();
   ::std::string* release_leading_comments();
   void set_allocated_leading_comments(::std::string* leading_comments);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_leading_comments();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_leading_comments(
+      ::std::string* leading_comments);
 
   // optional string trailing_comments = 4;
   bool has_trailing_comments() const;
@@ -3773,6 +5304,15 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
   ::std::string* mutable_trailing_comments();
   ::std::string* release_trailing_comments();
   void set_allocated_trailing_comments(::std::string* trailing_comments);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_trailing_comments();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_trailing_comments(
+      ::std::string* trailing_comments);
 
   // @@protoc_insertion_point(class_scope:google.protobuf.SourceCodeInfo.Location)
  private:
@@ -3782,8 +5322,11 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
   void clear_has_trailing_comments();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedField< ::google::protobuf::int32 > path_;
   mutable int _path_cached_byte_size_;
   ::google::protobuf::RepeatedField< ::google::protobuf::int32 > span_;
@@ -3791,7 +5334,7 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
   ::google::protobuf::RepeatedPtrField< ::std::string> leading_detached_comments_;
   ::google::protobuf::internal::ArenaStringPtr leading_comments_;
   ::google::protobuf::internal::ArenaStringPtr trailing_comments_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3806,65 +5349,96 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo : public ::google::protobuf::Message /*
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  SourceCodeInfo(SourceCodeInfo&& from) noexcept
+    : SourceCodeInfo() {
+    *this = ::std::move(from);
+  }
 
+  inline SourceCodeInfo& operator=(SourceCodeInfo&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const SourceCodeInfo& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const SourceCodeInfo* internal_default_instance() {
     return reinterpret_cast<const SourceCodeInfo*>(
                &_SourceCodeInfo_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    24;
 
+  void UnsafeArenaSwap(SourceCodeInfo* other);
   void Swap(SourceCodeInfo* other);
+  friend void swap(SourceCodeInfo& a, SourceCodeInfo& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline SourceCodeInfo* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline SourceCodeInfo* New() const final {
+    return CreateMaybeMessage<SourceCodeInfo>(NULL);
+  }
 
-  SourceCodeInfo* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  SourceCodeInfo* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<SourceCodeInfo>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const SourceCodeInfo& from);
   void MergeFrom(const SourceCodeInfo& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(SourceCodeInfo* other);
+  protected:
+  explicit SourceCodeInfo(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3876,11 +5450,11 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo : public ::google::protobuf::Message /*
   int location_size() const;
   void clear_location();
   static const int kLocationFieldNumber = 1;
-  const ::google::protobuf::SourceCodeInfo_Location& location(int index) const;
   ::google::protobuf::SourceCodeInfo_Location* mutable_location(int index);
-  ::google::protobuf::SourceCodeInfo_Location* add_location();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >*
       mutable_location();
+  const ::google::protobuf::SourceCodeInfo_Location& location(int index) const;
+  ::google::protobuf::SourceCodeInfo_Location* add_location();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >&
       location() const;
 
@@ -3888,10 +5462,13 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo : public ::google::protobuf::Message /*
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location > location_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -3906,65 +5483,96 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo_Annotation : public ::google::protobu
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  GeneratedCodeInfo_Annotation(GeneratedCodeInfo_Annotation&& from) noexcept
+    : GeneratedCodeInfo_Annotation() {
+    *this = ::std::move(from);
+  }
 
+  inline GeneratedCodeInfo_Annotation& operator=(GeneratedCodeInfo_Annotation&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const GeneratedCodeInfo_Annotation& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const GeneratedCodeInfo_Annotation* internal_default_instance() {
     return reinterpret_cast<const GeneratedCodeInfo_Annotation*>(
                &_GeneratedCodeInfo_Annotation_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    25;
 
+  void UnsafeArenaSwap(GeneratedCodeInfo_Annotation* other);
   void Swap(GeneratedCodeInfo_Annotation* other);
+  friend void swap(GeneratedCodeInfo_Annotation& a, GeneratedCodeInfo_Annotation& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline GeneratedCodeInfo_Annotation* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline GeneratedCodeInfo_Annotation* New() const final {
+    return CreateMaybeMessage<GeneratedCodeInfo_Annotation>(NULL);
+  }
 
-  GeneratedCodeInfo_Annotation* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  GeneratedCodeInfo_Annotation* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<GeneratedCodeInfo_Annotation>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const GeneratedCodeInfo_Annotation& from);
   void MergeFrom(const GeneratedCodeInfo_Annotation& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(GeneratedCodeInfo_Annotation* other);
+  protected:
+  explicit GeneratedCodeInfo_Annotation(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -3996,6 +5604,15 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo_Annotation : public ::google::protobu
   ::std::string* mutable_source_file();
   ::std::string* release_source_file();
   void set_allocated_source_file(::std::string* source_file);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  ::std::string* unsafe_arena_release_source_file();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
+  void unsafe_arena_set_allocated_source_file(
+      ::std::string* source_file);
 
   // optional int32 begin = 3;
   bool has_begin() const;
@@ -4021,14 +5638,17 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo_Annotation : public ::google::protobu
   void clear_has_end();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedField< ::google::protobuf::int32 > path_;
   mutable int _path_cached_byte_size_;
   ::google::protobuf::internal::ArenaStringPtr source_file_;
   ::google::protobuf::int32 begin_;
   ::google::protobuf::int32 end_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -4043,65 +5663,96 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo : public ::google::protobuf::Message
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  GeneratedCodeInfo(GeneratedCodeInfo&& from) noexcept
+    : GeneratedCodeInfo() {
+    *this = ::std::move(from);
+  }
 
+  inline GeneratedCodeInfo& operator=(GeneratedCodeInfo&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {
     return _internal_metadata_.unknown_fields();
   }
-
   inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {
     return _internal_metadata_.mutable_unknown_fields();
   }
 
+  inline ::google::protobuf::Arena* GetArena() const final {
+    return GetArenaNoVirtual();
+  }
+  inline void* GetMaybeArenaPointer() const final {
+    return MaybeArenaPtr();
+  }
   static const ::google::protobuf::Descriptor* descriptor();
   static const GeneratedCodeInfo& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const GeneratedCodeInfo* internal_default_instance() {
     return reinterpret_cast<const GeneratedCodeInfo*>(
                &_GeneratedCodeInfo_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    26;
 
+  void UnsafeArenaSwap(GeneratedCodeInfo* other);
   void Swap(GeneratedCodeInfo* other);
+  friend void swap(GeneratedCodeInfo& a, GeneratedCodeInfo& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline GeneratedCodeInfo* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline GeneratedCodeInfo* New() const final {
+    return CreateMaybeMessage<GeneratedCodeInfo>(NULL);
+  }
 
-  GeneratedCodeInfo* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  GeneratedCodeInfo* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<GeneratedCodeInfo>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const GeneratedCodeInfo& from);
   void MergeFrom(const GeneratedCodeInfo& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(GeneratedCodeInfo* other);
+  protected:
+  explicit GeneratedCodeInfo(::google::protobuf::Arena* arena);
+  private:
+  static void ArenaDtor(void* object);
+  inline void RegisterArenaDtor(::google::protobuf::Arena* arena);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
-    return NULL;
+    return _internal_metadata_.arena();
   }
   inline void* MaybeArenaPtr() const {
-    return NULL;
+    return _internal_metadata_.raw_arena_ptr();
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -4113,11 +5764,11 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo : public ::google::protobuf::Message
   int annotation_size() const;
   void clear_annotation();
   static const int kAnnotationFieldNumber = 1;
-  const ::google::protobuf::GeneratedCodeInfo_Annotation& annotation(int index) const;
   ::google::protobuf::GeneratedCodeInfo_Annotation* mutable_annotation(int index);
-  ::google::protobuf::GeneratedCodeInfo_Annotation* add_annotation();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >*
       mutable_annotation();
+  const ::google::protobuf::GeneratedCodeInfo_Annotation& annotation(int index) const;
+  ::google::protobuf::GeneratedCodeInfo_Annotation* add_annotation();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >&
       annotation() const;
 
@@ -4125,17 +5776,23 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo : public ::google::protobuf::Message
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
   ::google::protobuf::internal::HasBits<1> _has_bits_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation > annotation_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fdescriptor_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // FileDescriptorSet
 
 // repeated .google.protobuf.FileDescriptorProto file = 1;
@@ -4145,23 +5802,23 @@ inline int FileDescriptorSet::file_size() const {
 inline void FileDescriptorSet::clear_file() {
   file_.Clear();
 }
-inline const ::google::protobuf::FileDescriptorProto& FileDescriptorSet::file(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorSet.file)
-  return file_.Get(index);
-}
 inline ::google::protobuf::FileDescriptorProto* FileDescriptorSet::mutable_file(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorSet.file)
   return file_.Mutable(index);
 }
-inline ::google::protobuf::FileDescriptorProto* FileDescriptorSet::add_file() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorSet.file)
-  return file_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >*
 FileDescriptorSet::mutable_file() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorSet.file)
   return &file_;
 }
+inline const ::google::protobuf::FileDescriptorProto& FileDescriptorSet::file(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorSet.file)
+  return file_.Get(index);
+}
+inline ::google::protobuf::FileDescriptorProto* FileDescriptorSet::add_file() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorSet.file)
+  return file_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FileDescriptorProto >&
 FileDescriptorSet::file() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorSet.file)
@@ -4183,46 +5840,52 @@ inline void FileDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void FileDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& FileDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void FileDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void FileDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.name)
 }
 #endif
 inline void FileDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.name)
 }
-inline void FileDescriptorProto::set_name(const char* value, size_t size) {
+inline void FileDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.name)
 }
 inline ::std::string* FileDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -4230,9 +5893,29 @@ inline void FileDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.name)
 }
+inline ::std::string* FileDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileDescriptorProto.name)
+}
 
 // optional string package = 2;
 inline bool FileDescriptorProto::has_package() const {
@@ -4245,46 +5928,52 @@ inline void FileDescriptorProto::clear_has_package() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void FileDescriptorProto::clear_package() {
-  package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  package_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_package();
 }
 inline const ::std::string& FileDescriptorProto::package() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.package)
-  return package_.GetNoArena();
+  return package_.Get();
 }
 inline void FileDescriptorProto::set_package(const ::std::string& value) {
   set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.package)
 }
 #if LANG_CXX11
 inline void FileDescriptorProto::set_package(::std::string&& value) {
   set_has_package();
-  package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  package_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.package)
 }
 #endif
 inline void FileDescriptorProto::set_package(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.package)
 }
-inline void FileDescriptorProto::set_package(const char* value, size_t size) {
+inline void FileDescriptorProto::set_package(const char* value,
+    size_t size) {
   set_has_package();
-  package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.package)
 }
 inline ::std::string* FileDescriptorProto::mutable_package() {
   set_has_package();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.package)
-  return package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return package_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileDescriptorProto::release_package() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.package)
+  if (!has_package()) {
+    return NULL;
+  }
   clear_has_package();
-  return package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return package_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileDescriptorProto::set_allocated_package(::std::string* package) {
   if (package != NULL) {
@@ -4292,9 +5981,29 @@ inline void FileDescriptorProto::set_allocated_package(::std::string* package) {
   } else {
     clear_has_package();
   }
-  package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), package);
+  package_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), package,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.package)
 }
+inline ::std::string* FileDescriptorProto::unsafe_arena_release_package() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileDescriptorProto.package)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_package();
+  return package_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileDescriptorProto::unsafe_arena_set_allocated_package(
+    ::std::string* package) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (package != NULL) {
+    set_has_package();
+  } else {
+    clear_has_package();
+  }
+  package_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      package, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileDescriptorProto.package)
+}
 
 // repeated string dependency = 3;
 inline int FileDescriptorProto::dependency_size() const {
@@ -4322,6 +6031,7 @@ inline void FileDescriptorProto::set_dependency(int index, ::std::string&& value
 }
 #endif
 inline void FileDescriptorProto::set_dependency(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   dependency_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.dependency)
 }
@@ -4340,11 +6050,12 @@ inline void FileDescriptorProto::add_dependency(const ::std::string& value) {
 }
 #if LANG_CXX11
 inline void FileDescriptorProto::add_dependency(::std::string&& value) {
-  dependency_.Add()->assign(std::move(value));
+  dependency_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.dependency)
 }
 #endif
 inline void FileDescriptorProto::add_dependency(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   dependency_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.FileDescriptorProto.dependency)
 }
@@ -4430,23 +6141,23 @@ inline int FileDescriptorProto::message_type_size() const {
 inline void FileDescriptorProto::clear_message_type() {
   message_type_.Clear();
 }
-inline const ::google::protobuf::DescriptorProto& FileDescriptorProto::message_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_.Get(index);
-}
 inline ::google::protobuf::DescriptorProto* FileDescriptorProto::mutable_message_type(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.message_type)
   return message_type_.Mutable(index);
 }
-inline ::google::protobuf::DescriptorProto* FileDescriptorProto::add_message_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.message_type)
-  return message_type_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
 FileDescriptorProto::mutable_message_type() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.message_type)
   return &message_type_;
 }
+inline const ::google::protobuf::DescriptorProto& FileDescriptorProto::message_type(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.message_type)
+  return message_type_.Get(index);
+}
+inline ::google::protobuf::DescriptorProto* FileDescriptorProto::add_message_type() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.message_type)
+  return message_type_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
 FileDescriptorProto::message_type() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.message_type)
@@ -4460,23 +6171,23 @@ inline int FileDescriptorProto::enum_type_size() const {
 inline void FileDescriptorProto::clear_enum_type() {
   enum_type_.Clear();
 }
-inline const ::google::protobuf::EnumDescriptorProto& FileDescriptorProto::enum_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_.Get(index);
-}
 inline ::google::protobuf::EnumDescriptorProto* FileDescriptorProto::mutable_enum_type(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.enum_type)
   return enum_type_.Mutable(index);
 }
-inline ::google::protobuf::EnumDescriptorProto* FileDescriptorProto::add_enum_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.enum_type)
-  return enum_type_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
 FileDescriptorProto::mutable_enum_type() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.enum_type)
   return &enum_type_;
 }
+inline const ::google::protobuf::EnumDescriptorProto& FileDescriptorProto::enum_type(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.enum_type)
+  return enum_type_.Get(index);
+}
+inline ::google::protobuf::EnumDescriptorProto* FileDescriptorProto::add_enum_type() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.enum_type)
+  return enum_type_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
 FileDescriptorProto::enum_type() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.enum_type)
@@ -4490,23 +6201,23 @@ inline int FileDescriptorProto::service_size() const {
 inline void FileDescriptorProto::clear_service() {
   service_.Clear();
 }
-inline const ::google::protobuf::ServiceDescriptorProto& FileDescriptorProto::service(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.service)
-  return service_.Get(index);
-}
 inline ::google::protobuf::ServiceDescriptorProto* FileDescriptorProto::mutable_service(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.service)
   return service_.Mutable(index);
 }
-inline ::google::protobuf::ServiceDescriptorProto* FileDescriptorProto::add_service() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.service)
-  return service_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >*
 FileDescriptorProto::mutable_service() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.service)
   return &service_;
 }
+inline const ::google::protobuf::ServiceDescriptorProto& FileDescriptorProto::service(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.service)
+  return service_.Get(index);
+}
+inline ::google::protobuf::ServiceDescriptorProto* FileDescriptorProto::add_service() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.service)
+  return service_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::ServiceDescriptorProto >&
 FileDescriptorProto::service() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.service)
@@ -4520,23 +6231,23 @@ inline int FileDescriptorProto::extension_size() const {
 inline void FileDescriptorProto::clear_extension() {
   extension_.Clear();
 }
-inline const ::google::protobuf::FieldDescriptorProto& FileDescriptorProto::extension(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.extension)
-  return extension_.Get(index);
-}
 inline ::google::protobuf::FieldDescriptorProto* FileDescriptorProto::mutable_extension(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.extension)
   return extension_.Mutable(index);
 }
-inline ::google::protobuf::FieldDescriptorProto* FileDescriptorProto::add_extension() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.extension)
-  return extension_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
 FileDescriptorProto::mutable_extension() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileDescriptorProto.extension)
   return &extension_;
 }
+inline const ::google::protobuf::FieldDescriptorProto& FileDescriptorProto::extension(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.extension)
+  return extension_.Get(index);
+}
+inline ::google::protobuf::FieldDescriptorProto* FileDescriptorProto::add_extension() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileDescriptorProto.extension)
+  return extension_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
 FileDescriptorProto::extension() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileDescriptorProto.extension)
@@ -4554,37 +6265,61 @@ inline void FileDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000008u;
 }
 inline void FileDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::FileOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::FileOptions& FileDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::FileOptions& FileDescriptorProto::options() const {
+  const ::google::protobuf::FileOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::FileOptions::internal_default_instance();
-}
-inline ::google::protobuf::FileOptions* FileDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::FileOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::FileOptions*>(
+      &::google::protobuf::_FileOptions_default_instance_);
 }
 inline ::google::protobuf::FileOptions* FileDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::FileOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::FileOptions* FileDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::FileOptions* temp = options_;
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::FileOptions* FileDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::FileOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.options)
+  return options_;
+}
 inline void FileDescriptorProto::set_allocated_options(::google::protobuf::FileOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.options)
 }
 
@@ -4599,37 +6334,61 @@ inline void FileDescriptorProto::clear_has_source_code_info() {
   _has_bits_[0] &= ~0x00000010u;
 }
 inline void FileDescriptorProto::clear_source_code_info() {
-  if (source_code_info_ != NULL) source_code_info_->::google::protobuf::SourceCodeInfo::Clear();
+  if (source_code_info_ != NULL) source_code_info_->Clear();
   clear_has_source_code_info();
 }
+inline const ::google::protobuf::SourceCodeInfo& FileDescriptorProto::_internal_source_code_info() const {
+  return *source_code_info_;
+}
 inline const ::google::protobuf::SourceCodeInfo& FileDescriptorProto::source_code_info() const {
+  const ::google::protobuf::SourceCodeInfo* p = source_code_info_;
   // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.source_code_info)
-  return source_code_info_ != NULL ? *source_code_info_
-                         : *::google::protobuf::SourceCodeInfo::internal_default_instance();
-}
-inline ::google::protobuf::SourceCodeInfo* FileDescriptorProto::mutable_source_code_info() {
-  set_has_source_code_info();
-  if (source_code_info_ == NULL) {
-    source_code_info_ = new ::google::protobuf::SourceCodeInfo;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.source_code_info)
-  return source_code_info_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::SourceCodeInfo*>(
+      &::google::protobuf::_SourceCodeInfo_default_instance_);
 }
 inline ::google::protobuf::SourceCodeInfo* FileDescriptorProto::release_source_code_info() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.source_code_info)
   clear_has_source_code_info();
   ::google::protobuf::SourceCodeInfo* temp = source_code_info_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  source_code_info_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::SourceCodeInfo* FileDescriptorProto::unsafe_arena_release_source_code_info() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileDescriptorProto.source_code_info)
+  clear_has_source_code_info();
+  ::google::protobuf::SourceCodeInfo* temp = source_code_info_;
   source_code_info_ = NULL;
   return temp;
 }
+inline ::google::protobuf::SourceCodeInfo* FileDescriptorProto::mutable_source_code_info() {
+  set_has_source_code_info();
+  if (source_code_info_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::SourceCodeInfo>(GetArenaNoVirtual());
+    source_code_info_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.source_code_info)
+  return source_code_info_;
+}
 inline void FileDescriptorProto::set_allocated_source_code_info(::google::protobuf::SourceCodeInfo* source_code_info) {
-  delete source_code_info_;
-  source_code_info_ = source_code_info;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete source_code_info_;
+  }
   if (source_code_info) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(source_code_info);
+    if (message_arena != submessage_arena) {
+      source_code_info = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, source_code_info, submessage_arena);
+    }
     set_has_source_code_info();
   } else {
     clear_has_source_code_info();
   }
+  source_code_info_ = source_code_info;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.source_code_info)
 }
 
@@ -4644,46 +6403,52 @@ inline void FileDescriptorProto::clear_has_syntax() {
   _has_bits_[0] &= ~0x00000004u;
 }
 inline void FileDescriptorProto::clear_syntax() {
-  syntax_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  syntax_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_syntax();
 }
 inline const ::std::string& FileDescriptorProto::syntax() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileDescriptorProto.syntax)
-  return syntax_.GetNoArena();
+  return syntax_.Get();
 }
 inline void FileDescriptorProto::set_syntax(const ::std::string& value) {
   set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  syntax_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileDescriptorProto.syntax)
 }
 #if LANG_CXX11
 inline void FileDescriptorProto::set_syntax(::std::string&& value) {
   set_has_syntax();
-  syntax_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  syntax_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileDescriptorProto.syntax)
 }
 #endif
 inline void FileDescriptorProto::set_syntax(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  syntax_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileDescriptorProto.syntax)
 }
-inline void FileDescriptorProto::set_syntax(const char* value, size_t size) {
+inline void FileDescriptorProto::set_syntax(const char* value,
+    size_t size) {
   set_has_syntax();
-  syntax_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  syntax_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileDescriptorProto.syntax)
 }
 inline ::std::string* FileDescriptorProto::mutable_syntax() {
   set_has_syntax();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileDescriptorProto.syntax)
-  return syntax_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return syntax_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileDescriptorProto::release_syntax() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileDescriptorProto.syntax)
+  if (!has_syntax()) {
+    return NULL;
+  }
   clear_has_syntax();
-  return syntax_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return syntax_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileDescriptorProto::set_allocated_syntax(::std::string* syntax) {
   if (syntax != NULL) {
@@ -4691,9 +6456,29 @@ inline void FileDescriptorProto::set_allocated_syntax(::std::string* syntax) {
   } else {
     clear_has_syntax();
   }
-  syntax_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), syntax);
+  syntax_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), syntax,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileDescriptorProto.syntax)
 }
+inline ::std::string* FileDescriptorProto::unsafe_arena_release_syntax() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileDescriptorProto.syntax)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_syntax();
+  return syntax_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileDescriptorProto::unsafe_arena_set_allocated_syntax(
+    ::std::string* syntax) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (syntax != NULL) {
+    set_has_syntax();
+  } else {
+    clear_has_syntax();
+  }
+  syntax_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      syntax, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileDescriptorProto.syntax)
+}
 
 // -------------------------------------------------------------------
 
@@ -4701,13 +6486,13 @@ inline void FileDescriptorProto::set_allocated_syntax(::std::string* syntax) {
 
 // optional int32 start = 1;
 inline bool DescriptorProto_ExtensionRange::has_start() const {
-  return (_has_bits_[0] & 0x00000001u) != 0;
+  return (_has_bits_[0] & 0x00000002u) != 0;
 }
 inline void DescriptorProto_ExtensionRange::set_has_start() {
-  _has_bits_[0] |= 0x00000001u;
+  _has_bits_[0] |= 0x00000002u;
 }
 inline void DescriptorProto_ExtensionRange::clear_has_start() {
-  _has_bits_[0] &= ~0x00000001u;
+  _has_bits_[0] &= ~0x00000002u;
 }
 inline void DescriptorProto_ExtensionRange::clear_start() {
   start_ = 0;
@@ -4725,13 +6510,13 @@ inline void DescriptorProto_ExtensionRange::set_start(::google::protobuf::int32
 
 // optional int32 end = 2;
 inline bool DescriptorProto_ExtensionRange::has_end() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
+  return (_has_bits_[0] & 0x00000004u) != 0;
 }
 inline void DescriptorProto_ExtensionRange::set_has_end() {
-  _has_bits_[0] |= 0x00000002u;
+  _has_bits_[0] |= 0x00000004u;
 }
 inline void DescriptorProto_ExtensionRange::clear_has_end() {
-  _has_bits_[0] &= ~0x00000002u;
+  _has_bits_[0] &= ~0x00000004u;
 }
 inline void DescriptorProto_ExtensionRange::clear_end() {
   end_ = 0;
@@ -4747,6 +6532,75 @@ inline void DescriptorProto_ExtensionRange::set_end(::google::protobuf::int32 va
   // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.ExtensionRange.end)
 }
 
+// optional .google.protobuf.ExtensionRangeOptions options = 3;
+inline bool DescriptorProto_ExtensionRange::has_options() const {
+  return (_has_bits_[0] & 0x00000001u) != 0;
+}
+inline void DescriptorProto_ExtensionRange::set_has_options() {
+  _has_bits_[0] |= 0x00000001u;
+}
+inline void DescriptorProto_ExtensionRange::clear_has_options() {
+  _has_bits_[0] &= ~0x00000001u;
+}
+inline void DescriptorProto_ExtensionRange::clear_options() {
+  if (options_ != NULL) options_->Clear();
+  clear_has_options();
+}
+inline const ::google::protobuf::ExtensionRangeOptions& DescriptorProto_ExtensionRange::_internal_options() const {
+  return *options_;
+}
+inline const ::google::protobuf::ExtensionRangeOptions& DescriptorProto_ExtensionRange::options() const {
+  const ::google::protobuf::ExtensionRangeOptions* p = options_;
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.ExtensionRange.options)
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::ExtensionRangeOptions*>(
+      &::google::protobuf::_ExtensionRangeOptions_default_instance_);
+}
+inline ::google::protobuf::ExtensionRangeOptions* DescriptorProto_ExtensionRange::release_options() {
+  // @@protoc_insertion_point(field_release:google.protobuf.DescriptorProto.ExtensionRange.options)
+  clear_has_options();
+  ::google::protobuf::ExtensionRangeOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::ExtensionRangeOptions* DescriptorProto_ExtensionRange::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.DescriptorProto.ExtensionRange.options)
+  clear_has_options();
+  ::google::protobuf::ExtensionRangeOptions* temp = options_;
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::ExtensionRangeOptions* DescriptorProto_ExtensionRange::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::ExtensionRangeOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.ExtensionRange.options)
+  return options_;
+}
+inline void DescriptorProto_ExtensionRange::set_allocated_options(::google::protobuf::ExtensionRangeOptions* options) {
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
+  if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
+    set_has_options();
+  } else {
+    clear_has_options();
+  }
+  options_ = options;
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.DescriptorProto.ExtensionRange.options)
+}
+
 // -------------------------------------------------------------------
 
 // DescriptorProto_ReservedRange
@@ -4814,46 +6668,52 @@ inline void DescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void DescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& DescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void DescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.DescriptorProto.name)
 }
 #if LANG_CXX11
 inline void DescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.DescriptorProto.name)
 }
 #endif
 inline void DescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.DescriptorProto.name)
 }
-inline void DescriptorProto::set_name(const char* value, size_t size) {
+inline void DescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.DescriptorProto.name)
 }
 inline ::std::string* DescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* DescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.DescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void DescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -4861,9 +6721,29 @@ inline void DescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.DescriptorProto.name)
 }
+inline ::std::string* DescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.DescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void DescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.DescriptorProto.name)
+}
 
 // repeated .google.protobuf.FieldDescriptorProto field = 2;
 inline int DescriptorProto::field_size() const {
@@ -4872,23 +6752,23 @@ inline int DescriptorProto::field_size() const {
 inline void DescriptorProto::clear_field() {
   field_.Clear();
 }
-inline const ::google::protobuf::FieldDescriptorProto& DescriptorProto::field(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.field)
-  return field_.Get(index);
-}
 inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::mutable_field(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.field)
   return field_.Mutable(index);
 }
-inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::add_field() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.field)
-  return field_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
 DescriptorProto::mutable_field() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.field)
   return &field_;
 }
+inline const ::google::protobuf::FieldDescriptorProto& DescriptorProto::field(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.field)
+  return field_.Get(index);
+}
+inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::add_field() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.field)
+  return field_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
 DescriptorProto::field() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.field)
@@ -4902,23 +6782,23 @@ inline int DescriptorProto::extension_size() const {
 inline void DescriptorProto::clear_extension() {
   extension_.Clear();
 }
-inline const ::google::protobuf::FieldDescriptorProto& DescriptorProto::extension(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension)
-  return extension_.Get(index);
-}
 inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::mutable_extension(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.extension)
   return extension_.Mutable(index);
 }
-inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::add_extension() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension)
-  return extension_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >*
 DescriptorProto::mutable_extension() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.extension)
   return &extension_;
 }
+inline const ::google::protobuf::FieldDescriptorProto& DescriptorProto::extension(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension)
+  return extension_.Get(index);
+}
+inline ::google::protobuf::FieldDescriptorProto* DescriptorProto::add_extension() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension)
+  return extension_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::FieldDescriptorProto >&
 DescriptorProto::extension() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.extension)
@@ -4932,23 +6812,23 @@ inline int DescriptorProto::nested_type_size() const {
 inline void DescriptorProto::clear_nested_type() {
   nested_type_.Clear();
 }
-inline const ::google::protobuf::DescriptorProto& DescriptorProto::nested_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_.Get(index);
-}
 inline ::google::protobuf::DescriptorProto* DescriptorProto::mutable_nested_type(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.nested_type)
   return nested_type_.Mutable(index);
 }
-inline ::google::protobuf::DescriptorProto* DescriptorProto::add_nested_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.nested_type)
-  return nested_type_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >*
 DescriptorProto::mutable_nested_type() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.nested_type)
   return &nested_type_;
 }
+inline const ::google::protobuf::DescriptorProto& DescriptorProto::nested_type(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.nested_type)
+  return nested_type_.Get(index);
+}
+inline ::google::protobuf::DescriptorProto* DescriptorProto::add_nested_type() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.nested_type)
+  return nested_type_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto >&
 DescriptorProto::nested_type() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.nested_type)
@@ -4962,23 +6842,23 @@ inline int DescriptorProto::enum_type_size() const {
 inline void DescriptorProto::clear_enum_type() {
   enum_type_.Clear();
 }
-inline const ::google::protobuf::EnumDescriptorProto& DescriptorProto::enum_type(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_.Get(index);
-}
 inline ::google::protobuf::EnumDescriptorProto* DescriptorProto::mutable_enum_type(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.enum_type)
   return enum_type_.Mutable(index);
 }
-inline ::google::protobuf::EnumDescriptorProto* DescriptorProto::add_enum_type() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.enum_type)
-  return enum_type_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >*
 DescriptorProto::mutable_enum_type() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.enum_type)
   return &enum_type_;
 }
+inline const ::google::protobuf::EnumDescriptorProto& DescriptorProto::enum_type(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.enum_type)
+  return enum_type_.Get(index);
+}
+inline ::google::protobuf::EnumDescriptorProto* DescriptorProto::add_enum_type() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.enum_type)
+  return enum_type_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto >&
 DescriptorProto::enum_type() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.enum_type)
@@ -4992,23 +6872,23 @@ inline int DescriptorProto::extension_range_size() const {
 inline void DescriptorProto::clear_extension_range() {
   extension_range_.Clear();
 }
-inline const ::google::protobuf::DescriptorProto_ExtensionRange& DescriptorProto::extension_range(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_.Get(index);
-}
 inline ::google::protobuf::DescriptorProto_ExtensionRange* DescriptorProto::mutable_extension_range(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.extension_range)
   return extension_range_.Mutable(index);
 }
-inline ::google::protobuf::DescriptorProto_ExtensionRange* DescriptorProto::add_extension_range() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension_range)
-  return extension_range_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >*
 DescriptorProto::mutable_extension_range() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.extension_range)
   return &extension_range_;
 }
+inline const ::google::protobuf::DescriptorProto_ExtensionRange& DescriptorProto::extension_range(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.extension_range)
+  return extension_range_.Get(index);
+}
+inline ::google::protobuf::DescriptorProto_ExtensionRange* DescriptorProto::add_extension_range() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.extension_range)
+  return extension_range_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ExtensionRange >&
 DescriptorProto::extension_range() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.extension_range)
@@ -5022,23 +6902,23 @@ inline int DescriptorProto::oneof_decl_size() const {
 inline void DescriptorProto::clear_oneof_decl() {
   oneof_decl_.Clear();
 }
-inline const ::google::protobuf::OneofDescriptorProto& DescriptorProto::oneof_decl(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_.Get(index);
-}
 inline ::google::protobuf::OneofDescriptorProto* DescriptorProto::mutable_oneof_decl(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.oneof_decl)
   return oneof_decl_.Mutable(index);
 }
-inline ::google::protobuf::OneofDescriptorProto* DescriptorProto::add_oneof_decl() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.oneof_decl)
-  return oneof_decl_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >*
 DescriptorProto::mutable_oneof_decl() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.oneof_decl)
   return &oneof_decl_;
 }
+inline const ::google::protobuf::OneofDescriptorProto& DescriptorProto::oneof_decl(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.oneof_decl)
+  return oneof_decl_.Get(index);
+}
+inline ::google::protobuf::OneofDescriptorProto* DescriptorProto::add_oneof_decl() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.oneof_decl)
+  return oneof_decl_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::OneofDescriptorProto >&
 DescriptorProto::oneof_decl() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.oneof_decl)
@@ -5056,37 +6936,61 @@ inline void DescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void DescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::MessageOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::MessageOptions& DescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::MessageOptions& DescriptorProto::options() const {
+  const ::google::protobuf::MessageOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::MessageOptions::internal_default_instance();
-}
-inline ::google::protobuf::MessageOptions* DescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::MessageOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::MessageOptions*>(
+      &::google::protobuf::_MessageOptions_default_instance_);
 }
 inline ::google::protobuf::MessageOptions* DescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.DescriptorProto.options)
   clear_has_options();
   ::google::protobuf::MessageOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::MessageOptions* DescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.DescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::MessageOptions* temp = options_;
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::MessageOptions* DescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::MessageOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.options)
+  return options_;
+}
 inline void DescriptorProto::set_allocated_options(::google::protobuf::MessageOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.DescriptorProto.options)
 }
 
@@ -5097,23 +7001,23 @@ inline int DescriptorProto::reserved_range_size() const {
 inline void DescriptorProto::clear_reserved_range() {
   reserved_range_.Clear();
 }
-inline const ::google::protobuf::DescriptorProto_ReservedRange& DescriptorProto::reserved_range(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_.Get(index);
-}
 inline ::google::protobuf::DescriptorProto_ReservedRange* DescriptorProto::mutable_reserved_range(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.DescriptorProto.reserved_range)
   return reserved_range_.Mutable(index);
 }
-inline ::google::protobuf::DescriptorProto_ReservedRange* DescriptorProto::add_reserved_range() {
-  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_range)
-  return reserved_range_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >*
 DescriptorProto::mutable_reserved_range() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.DescriptorProto.reserved_range)
   return &reserved_range_;
 }
+inline const ::google::protobuf::DescriptorProto_ReservedRange& DescriptorProto::reserved_range(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.DescriptorProto.reserved_range)
+  return reserved_range_.Get(index);
+}
+inline ::google::protobuf::DescriptorProto_ReservedRange* DescriptorProto::add_reserved_range() {
+  // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_range)
+  return reserved_range_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::DescriptorProto_ReservedRange >&
 DescriptorProto::reserved_range() const {
   // @@protoc_insertion_point(field_list:google.protobuf.DescriptorProto.reserved_range)
@@ -5146,6 +7050,7 @@ inline void DescriptorProto::set_reserved_name(int index, ::std::string&& value)
 }
 #endif
 inline void DescriptorProto::set_reserved_name(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   reserved_name_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.DescriptorProto.reserved_name)
 }
@@ -5164,11 +7069,12 @@ inline void DescriptorProto::add_reserved_name(const ::std::string& value) {
 }
 #if LANG_CXX11
 inline void DescriptorProto::add_reserved_name(::std::string&& value) {
-  reserved_name_.Add()->assign(std::move(value));
+  reserved_name_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.DescriptorProto.reserved_name)
 }
 #endif
 inline void DescriptorProto::add_reserved_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   reserved_name_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.DescriptorProto.reserved_name)
 }
@@ -5189,6 +7095,40 @@ DescriptorProto::mutable_reserved_name() {
 
 // -------------------------------------------------------------------
 
+// ExtensionRangeOptions
+
+// repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
+inline int ExtensionRangeOptions::uninterpreted_option_size() const {
+  return uninterpreted_option_.size();
+}
+inline void ExtensionRangeOptions::clear_uninterpreted_option() {
+  uninterpreted_option_.Clear();
+}
+inline ::google::protobuf::UninterpretedOption* ExtensionRangeOptions::mutable_uninterpreted_option(int index) {
+  // @@protoc_insertion_point(field_mutable:google.protobuf.ExtensionRangeOptions.uninterpreted_option)
+  return uninterpreted_option_.Mutable(index);
+}
+inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
+ExtensionRangeOptions::mutable_uninterpreted_option() {
+  // @@protoc_insertion_point(field_mutable_list:google.protobuf.ExtensionRangeOptions.uninterpreted_option)
+  return &uninterpreted_option_;
+}
+inline const ::google::protobuf::UninterpretedOption& ExtensionRangeOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.ExtensionRangeOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* ExtensionRangeOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.ExtensionRangeOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
+inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
+ExtensionRangeOptions::uninterpreted_option() const {
+  // @@protoc_insertion_point(field_list:google.protobuf.ExtensionRangeOptions.uninterpreted_option)
+  return uninterpreted_option_;
+}
+
+// -------------------------------------------------------------------
+
 // FieldDescriptorProto
 
 // optional string name = 1;
@@ -5202,46 +7142,52 @@ inline void FieldDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void FieldDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& FieldDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void FieldDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void FieldDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.name)
 }
 #endif
 inline void FieldDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.name)
 }
-inline void FieldDescriptorProto::set_name(const char* value, size_t size) {
+inline void FieldDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.name)
 }
 inline ::std::string* FieldDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FieldDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FieldDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -5249,9 +7195,29 @@ inline void FieldDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.name)
 }
+inline ::std::string* FieldDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FieldDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.name)
+}
 
 // optional int32 number = 3;
 inline bool FieldDescriptorProto::has_number() const {
@@ -5329,55 +7295,61 @@ inline void FieldDescriptorProto::set_type(::google::protobuf::FieldDescriptorPr
 
 // optional string type_name = 6;
 inline bool FieldDescriptorProto::has_type_name() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
+  return (_has_bits_[0] & 0x00000004u) != 0;
 }
 inline void FieldDescriptorProto::set_has_type_name() {
-  _has_bits_[0] |= 0x00000002u;
+  _has_bits_[0] |= 0x00000004u;
 }
 inline void FieldDescriptorProto::clear_has_type_name() {
-  _has_bits_[0] &= ~0x00000002u;
+  _has_bits_[0] &= ~0x00000004u;
 }
 inline void FieldDescriptorProto::clear_type_name() {
-  type_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  type_name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_type_name();
 }
 inline const ::std::string& FieldDescriptorProto::type_name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.type_name)
-  return type_name_.GetNoArena();
+  return type_name_.Get();
 }
 inline void FieldDescriptorProto::set_type_name(const ::std::string& value) {
   set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  type_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.type_name)
 }
 #if LANG_CXX11
 inline void FieldDescriptorProto::set_type_name(::std::string&& value) {
   set_has_type_name();
-  type_name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  type_name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.type_name)
 }
 #endif
 inline void FieldDescriptorProto::set_type_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  type_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.type_name)
 }
-inline void FieldDescriptorProto::set_type_name(const char* value, size_t size) {
+inline void FieldDescriptorProto::set_type_name(const char* value,
+    size_t size) {
   set_has_type_name();
-  type_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  type_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.type_name)
 }
 inline ::std::string* FieldDescriptorProto::mutable_type_name() {
   set_has_type_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.type_name)
-  return type_name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return type_name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FieldDescriptorProto::release_type_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.type_name)
+  if (!has_type_name()) {
+    return NULL;
+  }
   clear_has_type_name();
-  return type_name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return type_name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FieldDescriptorProto::set_allocated_type_name(::std::string* type_name) {
   if (type_name != NULL) {
@@ -5385,61 +7357,87 @@ inline void FieldDescriptorProto::set_allocated_type_name(::std::string* type_na
   } else {
     clear_has_type_name();
   }
-  type_name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), type_name);
+  type_name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), type_name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.type_name)
 }
+inline ::std::string* FieldDescriptorProto::unsafe_arena_release_type_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.type_name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_type_name();
+  return type_name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FieldDescriptorProto::unsafe_arena_set_allocated_type_name(
+    ::std::string* type_name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (type_name != NULL) {
+    set_has_type_name();
+  } else {
+    clear_has_type_name();
+  }
+  type_name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      type_name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.type_name)
+}
 
 // optional string extendee = 2;
 inline bool FieldDescriptorProto::has_extendee() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
+  return (_has_bits_[0] & 0x00000002u) != 0;
 }
 inline void FieldDescriptorProto::set_has_extendee() {
-  _has_bits_[0] |= 0x00000004u;
+  _has_bits_[0] |= 0x00000002u;
 }
 inline void FieldDescriptorProto::clear_has_extendee() {
-  _has_bits_[0] &= ~0x00000004u;
+  _has_bits_[0] &= ~0x00000002u;
 }
 inline void FieldDescriptorProto::clear_extendee() {
-  extendee_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  extendee_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_extendee();
 }
 inline const ::std::string& FieldDescriptorProto::extendee() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.extendee)
-  return extendee_.GetNoArena();
+  return extendee_.Get();
 }
 inline void FieldDescriptorProto::set_extendee(const ::std::string& value) {
   set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  extendee_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.extendee)
 }
 #if LANG_CXX11
 inline void FieldDescriptorProto::set_extendee(::std::string&& value) {
   set_has_extendee();
-  extendee_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  extendee_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.extendee)
 }
 #endif
 inline void FieldDescriptorProto::set_extendee(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  extendee_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.extendee)
 }
-inline void FieldDescriptorProto::set_extendee(const char* value, size_t size) {
+inline void FieldDescriptorProto::set_extendee(const char* value,
+    size_t size) {
   set_has_extendee();
-  extendee_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  extendee_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.extendee)
 }
 inline ::std::string* FieldDescriptorProto::mutable_extendee() {
   set_has_extendee();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.extendee)
-  return extendee_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return extendee_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FieldDescriptorProto::release_extendee() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.extendee)
+  if (!has_extendee()) {
+    return NULL;
+  }
   clear_has_extendee();
-  return extendee_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return extendee_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FieldDescriptorProto::set_allocated_extendee(::std::string* extendee) {
   if (extendee != NULL) {
@@ -5447,9 +7445,29 @@ inline void FieldDescriptorProto::set_allocated_extendee(::std::string* extendee
   } else {
     clear_has_extendee();
   }
-  extendee_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), extendee);
+  extendee_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), extendee,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.extendee)
 }
+inline ::std::string* FieldDescriptorProto::unsafe_arena_release_extendee() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.extendee)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_extendee();
+  return extendee_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FieldDescriptorProto::unsafe_arena_set_allocated_extendee(
+    ::std::string* extendee) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (extendee != NULL) {
+    set_has_extendee();
+  } else {
+    clear_has_extendee();
+  }
+  extendee_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      extendee, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.extendee)
+}
 
 // optional string default_value = 7;
 inline bool FieldDescriptorProto::has_default_value() const {
@@ -5462,46 +7480,52 @@ inline void FieldDescriptorProto::clear_has_default_value() {
   _has_bits_[0] &= ~0x00000008u;
 }
 inline void FieldDescriptorProto::clear_default_value() {
-  default_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  default_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_default_value();
 }
 inline const ::std::string& FieldDescriptorProto::default_value() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.default_value)
-  return default_value_.GetNoArena();
+  return default_value_.Get();
 }
 inline void FieldDescriptorProto::set_default_value(const ::std::string& value) {
   set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.default_value)
 }
 #if LANG_CXX11
 inline void FieldDescriptorProto::set_default_value(::std::string&& value) {
   set_has_default_value();
-  default_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  default_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.default_value)
 }
 #endif
 inline void FieldDescriptorProto::set_default_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.default_value)
 }
-inline void FieldDescriptorProto::set_default_value(const char* value, size_t size) {
+inline void FieldDescriptorProto::set_default_value(const char* value,
+    size_t size) {
   set_has_default_value();
-  default_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.default_value)
 }
 inline ::std::string* FieldDescriptorProto::mutable_default_value() {
   set_has_default_value();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.default_value)
-  return default_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return default_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FieldDescriptorProto::release_default_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.default_value)
+  if (!has_default_value()) {
+    return NULL;
+  }
   clear_has_default_value();
-  return default_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return default_value_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FieldDescriptorProto::set_allocated_default_value(::std::string* default_value) {
   if (default_value != NULL) {
@@ -5509,9 +7533,29 @@ inline void FieldDescriptorProto::set_allocated_default_value(::std::string* def
   } else {
     clear_has_default_value();
   }
-  default_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), default_value);
+  default_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), default_value,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.default_value)
 }
+inline ::std::string* FieldDescriptorProto::unsafe_arena_release_default_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.default_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_default_value();
+  return default_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FieldDescriptorProto::unsafe_arena_set_allocated_default_value(
+    ::std::string* default_value) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (default_value != NULL) {
+    set_has_default_value();
+  } else {
+    clear_has_default_value();
+  }
+  default_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      default_value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.default_value)
+}
 
 // optional int32 oneof_index = 9;
 inline bool FieldDescriptorProto::has_oneof_index() const {
@@ -5548,46 +7592,52 @@ inline void FieldDescriptorProto::clear_has_json_name() {
   _has_bits_[0] &= ~0x00000010u;
 }
 inline void FieldDescriptorProto::clear_json_name() {
-  json_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  json_name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_json_name();
 }
 inline const ::std::string& FieldDescriptorProto::json_name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.json_name)
-  return json_name_.GetNoArena();
+  return json_name_.Get();
 }
 inline void FieldDescriptorProto::set_json_name(const ::std::string& value) {
   set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FieldDescriptorProto.json_name)
 }
 #if LANG_CXX11
 inline void FieldDescriptorProto::set_json_name(::std::string&& value) {
   set_has_json_name();
-  json_name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  json_name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FieldDescriptorProto.json_name)
 }
 #endif
 inline void FieldDescriptorProto::set_json_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldDescriptorProto.json_name)
 }
-inline void FieldDescriptorProto::set_json_name(const char* value, size_t size) {
+inline void FieldDescriptorProto::set_json_name(const char* value,
+    size_t size) {
   set_has_json_name();
-  json_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldDescriptorProto.json_name)
 }
 inline ::std::string* FieldDescriptorProto::mutable_json_name() {
   set_has_json_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.json_name)
-  return json_name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return json_name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FieldDescriptorProto::release_json_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.json_name)
+  if (!has_json_name()) {
+    return NULL;
+  }
   clear_has_json_name();
-  return json_name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return json_name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FieldDescriptorProto::set_allocated_json_name(::std::string* json_name) {
   if (json_name != NULL) {
@@ -5595,9 +7645,29 @@ inline void FieldDescriptorProto::set_allocated_json_name(::std::string* json_na
   } else {
     clear_has_json_name();
   }
-  json_name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), json_name);
+  json_name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), json_name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.json_name)
 }
+inline ::std::string* FieldDescriptorProto::unsafe_arena_release_json_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.json_name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_json_name();
+  return json_name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FieldDescriptorProto::unsafe_arena_set_allocated_json_name(
+    ::std::string* json_name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (json_name != NULL) {
+    set_has_json_name();
+  } else {
+    clear_has_json_name();
+  }
+  json_name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      json_name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FieldDescriptorProto.json_name)
+}
 
 // optional .google.protobuf.FieldOptions options = 8;
 inline bool FieldDescriptorProto::has_options() const {
@@ -5610,37 +7680,61 @@ inline void FieldDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000020u;
 }
 inline void FieldDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::FieldOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::FieldOptions& FieldDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::FieldOptions& FieldDescriptorProto::options() const {
+  const ::google::protobuf::FieldOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.FieldDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::FieldOptions::internal_default_instance();
-}
-inline ::google::protobuf::FieldOptions* FieldDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::FieldOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::FieldOptions*>(
+      &::google::protobuf::_FieldOptions_default_instance_);
 }
 inline ::google::protobuf::FieldOptions* FieldDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.FieldDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::FieldOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::FieldOptions* FieldDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FieldDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::FieldOptions* temp = options_;
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::FieldOptions* FieldDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::FieldOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldDescriptorProto.options)
+  return options_;
+}
 inline void FieldDescriptorProto::set_allocated_options(::google::protobuf::FieldOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FieldDescriptorProto.options)
 }
 
@@ -5659,46 +7753,52 @@ inline void OneofDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void OneofDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& OneofDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.OneofDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void OneofDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.OneofDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void OneofDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.OneofDescriptorProto.name)
 }
 #endif
 inline void OneofDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.OneofDescriptorProto.name)
 }
-inline void OneofDescriptorProto::set_name(const char* value, size_t size) {
+inline void OneofDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.OneofDescriptorProto.name)
 }
 inline ::std::string* OneofDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.OneofDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* OneofDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.OneofDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void OneofDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -5706,9 +7806,29 @@ inline void OneofDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.OneofDescriptorProto.name)
 }
+inline ::std::string* OneofDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.OneofDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void OneofDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.OneofDescriptorProto.name)
+}
 
 // optional .google.protobuf.OneofOptions options = 2;
 inline bool OneofDescriptorProto::has_options() const {
@@ -5721,42 +7841,118 @@ inline void OneofDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void OneofDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::OneofOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::OneofOptions& OneofDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::OneofOptions& OneofDescriptorProto::options() const {
+  const ::google::protobuf::OneofOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.OneofDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::OneofOptions::internal_default_instance();
-}
-inline ::google::protobuf::OneofOptions* OneofDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::OneofOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.OneofDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::OneofOptions*>(
+      &::google::protobuf::_OneofOptions_default_instance_);
 }
 inline ::google::protobuf::OneofOptions* OneofDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.OneofDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::OneofOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::OneofOptions* OneofDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.OneofDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::OneofOptions* temp = options_;
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::OneofOptions* OneofDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::OneofOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.OneofDescriptorProto.options)
+  return options_;
+}
 inline void OneofDescriptorProto::set_allocated_options(::google::protobuf::OneofOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.OneofDescriptorProto.options)
 }
 
 // -------------------------------------------------------------------
 
+// EnumDescriptorProto_EnumReservedRange
+
+// optional int32 start = 1;
+inline bool EnumDescriptorProto_EnumReservedRange::has_start() const {
+  return (_has_bits_[0] & 0x00000001u) != 0;
+}
+inline void EnumDescriptorProto_EnumReservedRange::set_has_start() {
+  _has_bits_[0] |= 0x00000001u;
+}
+inline void EnumDescriptorProto_EnumReservedRange::clear_has_start() {
+  _has_bits_[0] &= ~0x00000001u;
+}
+inline void EnumDescriptorProto_EnumReservedRange::clear_start() {
+  start_ = 0;
+  clear_has_start();
+}
+inline ::google::protobuf::int32 EnumDescriptorProto_EnumReservedRange::start() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.EnumReservedRange.start)
+  return start_;
+}
+inline void EnumDescriptorProto_EnumReservedRange::set_start(::google::protobuf::int32 value) {
+  set_has_start();
+  start_ = value;
+  // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.EnumReservedRange.start)
+}
+
+// optional int32 end = 2;
+inline bool EnumDescriptorProto_EnumReservedRange::has_end() const {
+  return (_has_bits_[0] & 0x00000002u) != 0;
+}
+inline void EnumDescriptorProto_EnumReservedRange::set_has_end() {
+  _has_bits_[0] |= 0x00000002u;
+}
+inline void EnumDescriptorProto_EnumReservedRange::clear_has_end() {
+  _has_bits_[0] &= ~0x00000002u;
+}
+inline void EnumDescriptorProto_EnumReservedRange::clear_end() {
+  end_ = 0;
+  clear_has_end();
+}
+inline ::google::protobuf::int32 EnumDescriptorProto_EnumReservedRange::end() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.EnumReservedRange.end)
+  return end_;
+}
+inline void EnumDescriptorProto_EnumReservedRange::set_end(::google::protobuf::int32 value) {
+  set_has_end();
+  end_ = value;
+  // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.EnumReservedRange.end)
+}
+
+// -------------------------------------------------------------------
+
 // EnumDescriptorProto
 
 // optional string name = 1;
@@ -5770,46 +7966,52 @@ inline void EnumDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void EnumDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& EnumDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void EnumDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void EnumDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.EnumDescriptorProto.name)
 }
 #endif
 inline void EnumDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.EnumDescriptorProto.name)
 }
-inline void EnumDescriptorProto::set_name(const char* value, size_t size) {
+inline void EnumDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumDescriptorProto.name)
 }
 inline ::std::string* EnumDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* EnumDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.EnumDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void EnumDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -5817,9 +8019,29 @@ inline void EnumDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumDescriptorProto.name)
 }
+inline ::std::string* EnumDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void EnumDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.EnumDescriptorProto.name)
+}
 
 // repeated .google.protobuf.EnumValueDescriptorProto value = 2;
 inline int EnumDescriptorProto::value_size() const {
@@ -5828,23 +8050,23 @@ inline int EnumDescriptorProto::value_size() const {
 inline void EnumDescriptorProto::clear_value() {
   value_.Clear();
 }
-inline const ::google::protobuf::EnumValueDescriptorProto& EnumDescriptorProto::value(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.value)
-  return value_.Get(index);
-}
 inline ::google::protobuf::EnumValueDescriptorProto* EnumDescriptorProto::mutable_value(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.value)
   return value_.Mutable(index);
 }
-inline ::google::protobuf::EnumValueDescriptorProto* EnumDescriptorProto::add_value() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.value)
-  return value_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >*
 EnumDescriptorProto::mutable_value() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumDescriptorProto.value)
   return &value_;
 }
+inline const ::google::protobuf::EnumValueDescriptorProto& EnumDescriptorProto::value(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.value)
+  return value_.Get(index);
+}
+inline ::google::protobuf::EnumValueDescriptorProto* EnumDescriptorProto::add_value() {
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.value)
+  return value_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValueDescriptorProto >&
 EnumDescriptorProto::value() const {
   // @@protoc_insertion_point(field_list:google.protobuf.EnumDescriptorProto.value)
@@ -5862,40 +8084,163 @@ inline void EnumDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void EnumDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::EnumOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::EnumOptions& EnumDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::EnumOptions& EnumDescriptorProto::options() const {
+  const ::google::protobuf::EnumOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::EnumOptions::internal_default_instance();
-}
-inline ::google::protobuf::EnumOptions* EnumDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::EnumOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::EnumOptions*>(
+      &::google::protobuf::_EnumOptions_default_instance_);
 }
 inline ::google::protobuf::EnumOptions* EnumDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.EnumDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::EnumOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::EnumOptions* EnumDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::EnumOptions* temp = options_;
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::EnumOptions* EnumDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::EnumOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.options)
+  return options_;
+}
 inline void EnumDescriptorProto::set_allocated_options(::google::protobuf::EnumOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumDescriptorProto.options)
 }
 
+// repeated .google.protobuf.EnumDescriptorProto.EnumReservedRange reserved_range = 4;
+inline int EnumDescriptorProto::reserved_range_size() const {
+  return reserved_range_.size();
+}
+inline void EnumDescriptorProto::clear_reserved_range() {
+  reserved_range_.Clear();
+}
+inline ::google::protobuf::EnumDescriptorProto_EnumReservedRange* EnumDescriptorProto::mutable_reserved_range(int index) {
+  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.reserved_range)
+  return reserved_range_.Mutable(index);
+}
+inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >*
+EnumDescriptorProto::mutable_reserved_range() {
+  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumDescriptorProto.reserved_range)
+  return &reserved_range_;
+}
+inline const ::google::protobuf::EnumDescriptorProto_EnumReservedRange& EnumDescriptorProto::reserved_range(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.reserved_range)
+  return reserved_range_.Get(index);
+}
+inline ::google::protobuf::EnumDescriptorProto_EnumReservedRange* EnumDescriptorProto::add_reserved_range() {
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.reserved_range)
+  return reserved_range_.Add();
+}
+inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >&
+EnumDescriptorProto::reserved_range() const {
+  // @@protoc_insertion_point(field_list:google.protobuf.EnumDescriptorProto.reserved_range)
+  return reserved_range_;
+}
+
+// repeated string reserved_name = 5;
+inline int EnumDescriptorProto::reserved_name_size() const {
+  return reserved_name_.size();
+}
+inline void EnumDescriptorProto::clear_reserved_name() {
+  reserved_name_.Clear();
+}
+inline const ::std::string& EnumDescriptorProto::reserved_name(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumDescriptorProto.reserved_name)
+  return reserved_name_.Get(index);
+}
+inline ::std::string* EnumDescriptorProto::mutable_reserved_name(int index) {
+  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumDescriptorProto.reserved_name)
+  return reserved_name_.Mutable(index);
+}
+inline void EnumDescriptorProto::set_reserved_name(int index, const ::std::string& value) {
+  // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.reserved_name)
+  reserved_name_.Mutable(index)->assign(value);
+}
+#if LANG_CXX11
+inline void EnumDescriptorProto::set_reserved_name(int index, ::std::string&& value) {
+  // @@protoc_insertion_point(field_set:google.protobuf.EnumDescriptorProto.reserved_name)
+  reserved_name_.Mutable(index)->assign(std::move(value));
+}
+#endif
+inline void EnumDescriptorProto::set_reserved_name(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  reserved_name_.Mutable(index)->assign(value);
+  // @@protoc_insertion_point(field_set_char:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+inline void EnumDescriptorProto::set_reserved_name(int index, const char* value, size_t size) {
+  reserved_name_.Mutable(index)->assign(
+    reinterpret_cast<const char*>(value), size);
+  // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+inline ::std::string* EnumDescriptorProto::add_reserved_name() {
+  // @@protoc_insertion_point(field_add_mutable:google.protobuf.EnumDescriptorProto.reserved_name)
+  return reserved_name_.Add();
+}
+inline void EnumDescriptorProto::add_reserved_name(const ::std::string& value) {
+  reserved_name_.Add()->assign(value);
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+#if LANG_CXX11
+inline void EnumDescriptorProto::add_reserved_name(::std::string&& value) {
+  reserved_name_.Add(std::move(value));
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+#endif
+inline void EnumDescriptorProto::add_reserved_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  reserved_name_.Add()->assign(value);
+  // @@protoc_insertion_point(field_add_char:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+inline void EnumDescriptorProto::add_reserved_name(const char* value, size_t size) {
+  reserved_name_.Add()->assign(reinterpret_cast<const char*>(value), size);
+  // @@protoc_insertion_point(field_add_pointer:google.protobuf.EnumDescriptorProto.reserved_name)
+}
+inline const ::google::protobuf::RepeatedPtrField< ::std::string>&
+EnumDescriptorProto::reserved_name() const {
+  // @@protoc_insertion_point(field_list:google.protobuf.EnumDescriptorProto.reserved_name)
+  return reserved_name_;
+}
+inline ::google::protobuf::RepeatedPtrField< ::std::string>*
+EnumDescriptorProto::mutable_reserved_name() {
+  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumDescriptorProto.reserved_name)
+  return &reserved_name_;
+}
+
 // -------------------------------------------------------------------
 
 // EnumValueDescriptorProto
@@ -5911,46 +8256,52 @@ inline void EnumValueDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void EnumValueDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& EnumValueDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.EnumValueDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void EnumValueDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.EnumValueDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void EnumValueDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.EnumValueDescriptorProto.name)
 }
 #endif
 inline void EnumValueDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.EnumValueDescriptorProto.name)
 }
-inline void EnumValueDescriptorProto::set_name(const char* value, size_t size) {
+inline void EnumValueDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumValueDescriptorProto.name)
 }
 inline ::std::string* EnumValueDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* EnumValueDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.EnumValueDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void EnumValueDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -5958,9 +8309,29 @@ inline void EnumValueDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValueDescriptorProto.name)
 }
+inline ::std::string* EnumValueDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumValueDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void EnumValueDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.EnumValueDescriptorProto.name)
+}
 
 // optional int32 number = 2;
 inline bool EnumValueDescriptorProto::has_number() const {
@@ -5997,37 +8368,61 @@ inline void EnumValueDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void EnumValueDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::EnumValueOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::EnumValueOptions& EnumValueDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::EnumValueOptions& EnumValueDescriptorProto::options() const {
+  const ::google::protobuf::EnumValueOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.EnumValueDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::EnumValueOptions::internal_default_instance();
-}
-inline ::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::EnumValueOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::EnumValueOptions*>(
+      &::google::protobuf::_EnumValueOptions_default_instance_);
 }
 inline ::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.EnumValueDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::EnumValueOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumValueDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::EnumValueOptions* temp = options_;
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::EnumValueOptions* EnumValueDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::EnumValueOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueDescriptorProto.options)
+  return options_;
+}
 inline void EnumValueDescriptorProto::set_allocated_options(::google::protobuf::EnumValueOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValueDescriptorProto.options)
 }
 
@@ -6046,46 +8441,52 @@ inline void ServiceDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void ServiceDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& ServiceDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void ServiceDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.ServiceDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void ServiceDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.ServiceDescriptorProto.name)
 }
 #endif
 inline void ServiceDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.ServiceDescriptorProto.name)
 }
-inline void ServiceDescriptorProto::set_name(const char* value, size_t size) {
+inline void ServiceDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.ServiceDescriptorProto.name)
 }
 inline ::std::string* ServiceDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* ServiceDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.ServiceDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void ServiceDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -6093,9 +8494,29 @@ inline void ServiceDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.ServiceDescriptorProto.name)
 }
+inline ::std::string* ServiceDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.ServiceDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void ServiceDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.ServiceDescriptorProto.name)
+}
 
 // repeated .google.protobuf.MethodDescriptorProto method = 2;
 inline int ServiceDescriptorProto::method_size() const {
@@ -6104,23 +8525,23 @@ inline int ServiceDescriptorProto::method_size() const {
 inline void ServiceDescriptorProto::clear_method() {
   method_.Clear();
 }
-inline const ::google::protobuf::MethodDescriptorProto& ServiceDescriptorProto::method(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.method)
-  return method_.Get(index);
-}
 inline ::google::protobuf::MethodDescriptorProto* ServiceDescriptorProto::mutable_method(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.method)
   return method_.Mutable(index);
 }
-inline ::google::protobuf::MethodDescriptorProto* ServiceDescriptorProto::add_method() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ServiceDescriptorProto.method)
-  return method_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >*
 ServiceDescriptorProto::mutable_method() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.ServiceDescriptorProto.method)
   return &method_;
 }
+inline const ::google::protobuf::MethodDescriptorProto& ServiceDescriptorProto::method(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.method)
+  return method_.Get(index);
+}
+inline ::google::protobuf::MethodDescriptorProto* ServiceDescriptorProto::add_method() {
+  // @@protoc_insertion_point(field_add:google.protobuf.ServiceDescriptorProto.method)
+  return method_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::MethodDescriptorProto >&
 ServiceDescriptorProto::method() const {
   // @@protoc_insertion_point(field_list:google.protobuf.ServiceDescriptorProto.method)
@@ -6138,37 +8559,61 @@ inline void ServiceDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void ServiceDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::ServiceOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::ServiceOptions& ServiceDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::ServiceOptions& ServiceDescriptorProto::options() const {
+  const ::google::protobuf::ServiceOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.ServiceDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::ServiceOptions::internal_default_instance();
-}
-inline ::google::protobuf::ServiceOptions* ServiceDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::ServiceOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::ServiceOptions*>(
+      &::google::protobuf::_ServiceOptions_default_instance_);
 }
 inline ::google::protobuf::ServiceOptions* ServiceDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.ServiceDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::ServiceOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::ServiceOptions* ServiceDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.ServiceDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::ServiceOptions* temp = options_;
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::ServiceOptions* ServiceDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::ServiceOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceDescriptorProto.options)
+  return options_;
+}
 inline void ServiceDescriptorProto::set_allocated_options(::google::protobuf::ServiceOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.ServiceDescriptorProto.options)
 }
 
@@ -6187,46 +8632,52 @@ inline void MethodDescriptorProto::clear_has_name() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void MethodDescriptorProto::clear_name() {
-  name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name();
 }
 inline const ::std::string& MethodDescriptorProto::name() const {
   // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.name)
-  return name_.GetNoArena();
+  return name_.Get();
 }
 inline void MethodDescriptorProto::set_name(const ::std::string& value) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.name)
 }
 #if LANG_CXX11
 inline void MethodDescriptorProto::set_name(::std::string&& value) {
   set_has_name();
-  name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.name)
 }
 #endif
 inline void MethodDescriptorProto::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.name)
 }
-inline void MethodDescriptorProto::set_name(const char* value, size_t size) {
+inline void MethodDescriptorProto::set_name(const char* value,
+    size_t size) {
   set_has_name();
-  name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.name)
 }
 inline ::std::string* MethodDescriptorProto::mutable_name() {
   set_has_name();
   // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.name)
-  return name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* MethodDescriptorProto::release_name() {
   // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.name)
+  if (!has_name()) {
+    return NULL;
+  }
   clear_has_name();
-  return name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void MethodDescriptorProto::set_allocated_name(::std::string* name) {
   if (name != NULL) {
@@ -6234,9 +8685,29 @@ inline void MethodDescriptorProto::set_allocated_name(::std::string* name) {
   } else {
     clear_has_name();
   }
-  name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name);
+  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.name)
 }
+inline ::std::string* MethodDescriptorProto::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.MethodDescriptorProto.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name();
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void MethodDescriptorProto::unsafe_arena_set_allocated_name(
+    ::std::string* name) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name != NULL) {
+    set_has_name();
+  } else {
+    clear_has_name();
+  }
+  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.MethodDescriptorProto.name)
+}
 
 // optional string input_type = 2;
 inline bool MethodDescriptorProto::has_input_type() const {
@@ -6249,46 +8720,52 @@ inline void MethodDescriptorProto::clear_has_input_type() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void MethodDescriptorProto::clear_input_type() {
-  input_type_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  input_type_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_input_type();
 }
 inline const ::std::string& MethodDescriptorProto::input_type() const {
   // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.input_type)
-  return input_type_.GetNoArena();
+  return input_type_.Get();
 }
 inline void MethodDescriptorProto::set_input_type(const ::std::string& value) {
   set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  input_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.input_type)
 }
 #if LANG_CXX11
 inline void MethodDescriptorProto::set_input_type(::std::string&& value) {
   set_has_input_type();
-  input_type_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  input_type_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.input_type)
 }
 #endif
 inline void MethodDescriptorProto::set_input_type(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  input_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.input_type)
 }
-inline void MethodDescriptorProto::set_input_type(const char* value, size_t size) {
+inline void MethodDescriptorProto::set_input_type(const char* value,
+    size_t size) {
   set_has_input_type();
-  input_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  input_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.input_type)
 }
 inline ::std::string* MethodDescriptorProto::mutable_input_type() {
   set_has_input_type();
   // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.input_type)
-  return input_type_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return input_type_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* MethodDescriptorProto::release_input_type() {
   // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.input_type)
+  if (!has_input_type()) {
+    return NULL;
+  }
   clear_has_input_type();
-  return input_type_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return input_type_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void MethodDescriptorProto::set_allocated_input_type(::std::string* input_type) {
   if (input_type != NULL) {
@@ -6296,9 +8773,29 @@ inline void MethodDescriptorProto::set_allocated_input_type(::std::string* input
   } else {
     clear_has_input_type();
   }
-  input_type_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), input_type);
+  input_type_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), input_type,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.input_type)
 }
+inline ::std::string* MethodDescriptorProto::unsafe_arena_release_input_type() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.MethodDescriptorProto.input_type)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_input_type();
+  return input_type_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void MethodDescriptorProto::unsafe_arena_set_allocated_input_type(
+    ::std::string* input_type) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (input_type != NULL) {
+    set_has_input_type();
+  } else {
+    clear_has_input_type();
+  }
+  input_type_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      input_type, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.MethodDescriptorProto.input_type)
+}
 
 // optional string output_type = 3;
 inline bool MethodDescriptorProto::has_output_type() const {
@@ -6311,46 +8808,52 @@ inline void MethodDescriptorProto::clear_has_output_type() {
   _has_bits_[0] &= ~0x00000004u;
 }
 inline void MethodDescriptorProto::clear_output_type() {
-  output_type_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  output_type_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_output_type();
 }
 inline const ::std::string& MethodDescriptorProto::output_type() const {
   // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.output_type)
-  return output_type_.GetNoArena();
+  return output_type_.Get();
 }
 inline void MethodDescriptorProto::set_output_type(const ::std::string& value) {
   set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  output_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.MethodDescriptorProto.output_type)
 }
 #if LANG_CXX11
 inline void MethodDescriptorProto::set_output_type(::std::string&& value) {
   set_has_output_type();
-  output_type_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  output_type_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.MethodDescriptorProto.output_type)
 }
 #endif
 inline void MethodDescriptorProto::set_output_type(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  output_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.MethodDescriptorProto.output_type)
 }
-inline void MethodDescriptorProto::set_output_type(const char* value, size_t size) {
+inline void MethodDescriptorProto::set_output_type(const char* value,
+    size_t size) {
   set_has_output_type();
-  output_type_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  output_type_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.MethodDescriptorProto.output_type)
 }
 inline ::std::string* MethodDescriptorProto::mutable_output_type() {
   set_has_output_type();
   // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.output_type)
-  return output_type_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return output_type_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* MethodDescriptorProto::release_output_type() {
   // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.output_type)
+  if (!has_output_type()) {
+    return NULL;
+  }
   clear_has_output_type();
-  return output_type_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return output_type_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void MethodDescriptorProto::set_allocated_output_type(::std::string* output_type) {
   if (output_type != NULL) {
@@ -6358,9 +8861,29 @@ inline void MethodDescriptorProto::set_allocated_output_type(::std::string* outp
   } else {
     clear_has_output_type();
   }
-  output_type_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), output_type);
+  output_type_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), output_type,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.output_type)
 }
+inline ::std::string* MethodDescriptorProto::unsafe_arena_release_output_type() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.MethodDescriptorProto.output_type)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_output_type();
+  return output_type_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void MethodDescriptorProto::unsafe_arena_set_allocated_output_type(
+    ::std::string* output_type) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (output_type != NULL) {
+    set_has_output_type();
+  } else {
+    clear_has_output_type();
+  }
+  output_type_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      output_type, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.MethodDescriptorProto.output_type)
+}
 
 // optional .google.protobuf.MethodOptions options = 4;
 inline bool MethodDescriptorProto::has_options() const {
@@ -6373,37 +8896,61 @@ inline void MethodDescriptorProto::clear_has_options() {
   _has_bits_[0] &= ~0x00000008u;
 }
 inline void MethodDescriptorProto::clear_options() {
-  if (options_ != NULL) options_->::google::protobuf::MethodOptions::Clear();
+  if (options_ != NULL) options_->Clear();
   clear_has_options();
 }
+inline const ::google::protobuf::MethodOptions& MethodDescriptorProto::_internal_options() const {
+  return *options_;
+}
 inline const ::google::protobuf::MethodOptions& MethodDescriptorProto::options() const {
+  const ::google::protobuf::MethodOptions* p = options_;
   // @@protoc_insertion_point(field_get:google.protobuf.MethodDescriptorProto.options)
-  return options_ != NULL ? *options_
-                         : *::google::protobuf::MethodOptions::internal_default_instance();
-}
-inline ::google::protobuf::MethodOptions* MethodDescriptorProto::mutable_options() {
-  set_has_options();
-  if (options_ == NULL) {
-    options_ = new ::google::protobuf::MethodOptions;
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.options)
-  return options_;
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::MethodOptions*>(
+      &::google::protobuf::_MethodOptions_default_instance_);
 }
 inline ::google::protobuf::MethodOptions* MethodDescriptorProto::release_options() {
   // @@protoc_insertion_point(field_release:google.protobuf.MethodDescriptorProto.options)
   clear_has_options();
   ::google::protobuf::MethodOptions* temp = options_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
   options_ = NULL;
   return temp;
 }
+inline ::google::protobuf::MethodOptions* MethodDescriptorProto::unsafe_arena_release_options() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.MethodDescriptorProto.options)
+  clear_has_options();
+  ::google::protobuf::MethodOptions* temp = options_;
+  options_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::MethodOptions* MethodDescriptorProto::mutable_options() {
+  set_has_options();
+  if (options_ == NULL) {
+    auto* p = CreateMaybeMessage<::google::protobuf::MethodOptions>(GetArenaNoVirtual());
+    options_ = p;
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.MethodDescriptorProto.options)
+  return options_;
+}
 inline void MethodDescriptorProto::set_allocated_options(::google::protobuf::MethodOptions* options) {
-  delete options_;
-  options_ = options;
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  if (message_arena == NULL) {
+    delete options_;
+  }
   if (options) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(options);
+    if (message_arena != submessage_arena) {
+      options = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, options, submessage_arena);
+    }
     set_has_options();
   } else {
     clear_has_options();
   }
+  options_ = options;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.MethodDescriptorProto.options)
 }
 
@@ -6470,46 +9017,52 @@ inline void FileOptions::clear_has_java_package() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void FileOptions::clear_java_package() {
-  java_package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  java_package_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_java_package();
 }
 inline const ::std::string& FileOptions::java_package() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_package)
-  return java_package_.GetNoArena();
+  return java_package_.Get();
 }
 inline void FileOptions::set_java_package(const ::std::string& value) {
   set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  java_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_package)
 }
 #if LANG_CXX11
 inline void FileOptions::set_java_package(::std::string&& value) {
   set_has_java_package();
-  java_package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  java_package_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.java_package)
 }
 #endif
 inline void FileOptions::set_java_package(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  java_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.java_package)
 }
-inline void FileOptions::set_java_package(const char* value, size_t size) {
+inline void FileOptions::set_java_package(const char* value,
+    size_t size) {
   set_has_java_package();
-  java_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  java_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.java_package)
 }
 inline ::std::string* FileOptions::mutable_java_package() {
   set_has_java_package();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.java_package)
-  return java_package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return java_package_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_java_package() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.java_package)
+  if (!has_java_package()) {
+    return NULL;
+  }
   clear_has_java_package();
-  return java_package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return java_package_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_java_package(::std::string* java_package) {
   if (java_package != NULL) {
@@ -6517,9 +9070,29 @@ inline void FileOptions::set_allocated_java_package(::std::string* java_package)
   } else {
     clear_has_java_package();
   }
-  java_package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_package);
+  java_package_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_package,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.java_package)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_java_package() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.java_package)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_java_package();
+  return java_package_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_java_package(
+    ::std::string* java_package) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (java_package != NULL) {
+    set_has_java_package();
+  } else {
+    clear_has_java_package();
+  }
+  java_package_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      java_package, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.java_package)
+}
 
 // optional string java_outer_classname = 8;
 inline bool FileOptions::has_java_outer_classname() const {
@@ -6532,46 +9105,52 @@ inline void FileOptions::clear_has_java_outer_classname() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void FileOptions::clear_java_outer_classname() {
-  java_outer_classname_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  java_outer_classname_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_java_outer_classname();
 }
 inline const ::std::string& FileOptions::java_outer_classname() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.java_outer_classname)
-  return java_outer_classname_.GetNoArena();
+  return java_outer_classname_.Get();
 }
 inline void FileOptions::set_java_outer_classname(const ::std::string& value) {
   set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  java_outer_classname_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.java_outer_classname)
 }
 #if LANG_CXX11
 inline void FileOptions::set_java_outer_classname(::std::string&& value) {
   set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  java_outer_classname_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.java_outer_classname)
 }
 #endif
 inline void FileOptions::set_java_outer_classname(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  java_outer_classname_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.java_outer_classname)
 }
-inline void FileOptions::set_java_outer_classname(const char* value, size_t size) {
+inline void FileOptions::set_java_outer_classname(const char* value,
+    size_t size) {
   set_has_java_outer_classname();
-  java_outer_classname_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  java_outer_classname_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.java_outer_classname)
 }
 inline ::std::string* FileOptions::mutable_java_outer_classname() {
   set_has_java_outer_classname();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.java_outer_classname)
-  return java_outer_classname_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return java_outer_classname_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_java_outer_classname() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.java_outer_classname)
+  if (!has_java_outer_classname()) {
+    return NULL;
+  }
   clear_has_java_outer_classname();
-  return java_outer_classname_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return java_outer_classname_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_java_outer_classname(::std::string* java_outer_classname) {
   if (java_outer_classname != NULL) {
@@ -6579,19 +9158,39 @@ inline void FileOptions::set_allocated_java_outer_classname(::std::string* java_
   } else {
     clear_has_java_outer_classname();
   }
-  java_outer_classname_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_outer_classname);
+  java_outer_classname_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), java_outer_classname,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.java_outer_classname)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_java_outer_classname() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.java_outer_classname)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_java_outer_classname();
+  return java_outer_classname_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_java_outer_classname(
+    ::std::string* java_outer_classname) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (java_outer_classname != NULL) {
+    set_has_java_outer_classname();
+  } else {
+    clear_has_java_outer_classname();
+  }
+  java_outer_classname_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      java_outer_classname, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.java_outer_classname)
+}
 
 // optional bool java_multiple_files = 10 [default = false];
 inline bool FileOptions::has_java_multiple_files() const {
-  return (_has_bits_[0] & 0x00000040u) != 0;
+  return (_has_bits_[0] & 0x00000400u) != 0;
 }
 inline void FileOptions::set_has_java_multiple_files() {
-  _has_bits_[0] |= 0x00000040u;
+  _has_bits_[0] |= 0x00000400u;
 }
 inline void FileOptions::clear_has_java_multiple_files() {
-  _has_bits_[0] &= ~0x00000040u;
+  _has_bits_[0] &= ~0x00000400u;
 }
 inline void FileOptions::clear_java_multiple_files() {
   java_multiple_files_ = false;
@@ -6609,13 +9208,13 @@ inline void FileOptions::set_java_multiple_files(bool value) {
 
 // optional bool java_generate_equals_and_hash = 20 [deprecated = true];
 inline bool FileOptions::has_java_generate_equals_and_hash() const {
-  return (_has_bits_[0] & 0x00000080u) != 0;
+  return (_has_bits_[0] & 0x00000800u) != 0;
 }
 inline void FileOptions::set_has_java_generate_equals_and_hash() {
-  _has_bits_[0] |= 0x00000080u;
+  _has_bits_[0] |= 0x00000800u;
 }
 inline void FileOptions::clear_has_java_generate_equals_and_hash() {
-  _has_bits_[0] &= ~0x00000080u;
+  _has_bits_[0] &= ~0x00000800u;
 }
 inline void FileOptions::clear_java_generate_equals_and_hash() {
   java_generate_equals_and_hash_ = false;
@@ -6633,13 +9232,13 @@ inline void FileOptions::set_java_generate_equals_and_hash(bool value) {
 
 // optional bool java_string_check_utf8 = 27 [default = false];
 inline bool FileOptions::has_java_string_check_utf8() const {
-  return (_has_bits_[0] & 0x00000100u) != 0;
+  return (_has_bits_[0] & 0x00001000u) != 0;
 }
 inline void FileOptions::set_has_java_string_check_utf8() {
-  _has_bits_[0] |= 0x00000100u;
+  _has_bits_[0] |= 0x00001000u;
 }
 inline void FileOptions::clear_has_java_string_check_utf8() {
-  _has_bits_[0] &= ~0x00000100u;
+  _has_bits_[0] &= ~0x00001000u;
 }
 inline void FileOptions::clear_java_string_check_utf8() {
   java_string_check_utf8_ = false;
@@ -6657,13 +9256,13 @@ inline void FileOptions::set_java_string_check_utf8(bool value) {
 
 // optional .google.protobuf.FileOptions.OptimizeMode optimize_for = 9 [default = SPEED];
 inline bool FileOptions::has_optimize_for() const {
-  return (_has_bits_[0] & 0x00004000u) != 0;
+  return (_has_bits_[0] & 0x00080000u) != 0;
 }
 inline void FileOptions::set_has_optimize_for() {
-  _has_bits_[0] |= 0x00004000u;
+  _has_bits_[0] |= 0x00080000u;
 }
 inline void FileOptions::clear_has_optimize_for() {
-  _has_bits_[0] &= ~0x00004000u;
+  _has_bits_[0] &= ~0x00080000u;
 }
 inline void FileOptions::clear_optimize_for() {
   optimize_for_ = 1;
@@ -6691,46 +9290,52 @@ inline void FileOptions::clear_has_go_package() {
   _has_bits_[0] &= ~0x00000004u;
 }
 inline void FileOptions::clear_go_package() {
-  go_package_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  go_package_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_go_package();
 }
 inline const ::std::string& FileOptions::go_package() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.go_package)
-  return go_package_.GetNoArena();
+  return go_package_.Get();
 }
 inline void FileOptions::set_go_package(const ::std::string& value) {
   set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  go_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.go_package)
 }
 #if LANG_CXX11
 inline void FileOptions::set_go_package(::std::string&& value) {
   set_has_go_package();
-  go_package_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  go_package_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.go_package)
 }
 #endif
 inline void FileOptions::set_go_package(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  go_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.go_package)
 }
-inline void FileOptions::set_go_package(const char* value, size_t size) {
+inline void FileOptions::set_go_package(const char* value,
+    size_t size) {
   set_has_go_package();
-  go_package_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  go_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.go_package)
 }
 inline ::std::string* FileOptions::mutable_go_package() {
   set_has_go_package();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.go_package)
-  return go_package_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return go_package_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_go_package() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.go_package)
+  if (!has_go_package()) {
+    return NULL;
+  }
   clear_has_go_package();
-  return go_package_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return go_package_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_go_package(::std::string* go_package) {
   if (go_package != NULL) {
@@ -6738,19 +9343,39 @@ inline void FileOptions::set_allocated_go_package(::std::string* go_package) {
   } else {
     clear_has_go_package();
   }
-  go_package_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), go_package);
+  go_package_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), go_package,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.go_package)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_go_package() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.go_package)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_go_package();
+  return go_package_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_go_package(
+    ::std::string* go_package) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (go_package != NULL) {
+    set_has_go_package();
+  } else {
+    clear_has_go_package();
+  }
+  go_package_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      go_package, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.go_package)
+}
 
 // optional bool cc_generic_services = 16 [default = false];
 inline bool FileOptions::has_cc_generic_services() const {
-  return (_has_bits_[0] & 0x00000200u) != 0;
+  return (_has_bits_[0] & 0x00002000u) != 0;
 }
 inline void FileOptions::set_has_cc_generic_services() {
-  _has_bits_[0] |= 0x00000200u;
+  _has_bits_[0] |= 0x00002000u;
 }
 inline void FileOptions::clear_has_cc_generic_services() {
-  _has_bits_[0] &= ~0x00000200u;
+  _has_bits_[0] &= ~0x00002000u;
 }
 inline void FileOptions::clear_cc_generic_services() {
   cc_generic_services_ = false;
@@ -6768,13 +9393,13 @@ inline void FileOptions::set_cc_generic_services(bool value) {
 
 // optional bool java_generic_services = 17 [default = false];
 inline bool FileOptions::has_java_generic_services() const {
-  return (_has_bits_[0] & 0x00000400u) != 0;
+  return (_has_bits_[0] & 0x00004000u) != 0;
 }
 inline void FileOptions::set_has_java_generic_services() {
-  _has_bits_[0] |= 0x00000400u;
+  _has_bits_[0] |= 0x00004000u;
 }
 inline void FileOptions::clear_has_java_generic_services() {
-  _has_bits_[0] &= ~0x00000400u;
+  _has_bits_[0] &= ~0x00004000u;
 }
 inline void FileOptions::clear_java_generic_services() {
   java_generic_services_ = false;
@@ -6792,13 +9417,13 @@ inline void FileOptions::set_java_generic_services(bool value) {
 
 // optional bool py_generic_services = 18 [default = false];
 inline bool FileOptions::has_py_generic_services() const {
-  return (_has_bits_[0] & 0x00000800u) != 0;
+  return (_has_bits_[0] & 0x00008000u) != 0;
 }
 inline void FileOptions::set_has_py_generic_services() {
-  _has_bits_[0] |= 0x00000800u;
+  _has_bits_[0] |= 0x00008000u;
 }
 inline void FileOptions::clear_has_py_generic_services() {
-  _has_bits_[0] &= ~0x00000800u;
+  _has_bits_[0] &= ~0x00008000u;
 }
 inline void FileOptions::clear_py_generic_services() {
   py_generic_services_ = false;
@@ -6814,15 +9439,39 @@ inline void FileOptions::set_py_generic_services(bool value) {
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.py_generic_services)
 }
 
+// optional bool php_generic_services = 42 [default = false];
+inline bool FileOptions::has_php_generic_services() const {
+  return (_has_bits_[0] & 0x00010000u) != 0;
+}
+inline void FileOptions::set_has_php_generic_services() {
+  _has_bits_[0] |= 0x00010000u;
+}
+inline void FileOptions::clear_has_php_generic_services() {
+  _has_bits_[0] &= ~0x00010000u;
+}
+inline void FileOptions::clear_php_generic_services() {
+  php_generic_services_ = false;
+  clear_has_php_generic_services();
+}
+inline bool FileOptions::php_generic_services() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.php_generic_services)
+  return php_generic_services_;
+}
+inline void FileOptions::set_php_generic_services(bool value) {
+  set_has_php_generic_services();
+  php_generic_services_ = value;
+  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.php_generic_services)
+}
+
 // optional bool deprecated = 23 [default = false];
 inline bool FileOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00001000u) != 0;
+  return (_has_bits_[0] & 0x00020000u) != 0;
 }
 inline void FileOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00001000u;
+  _has_bits_[0] |= 0x00020000u;
 }
 inline void FileOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00001000u;
+  _has_bits_[0] &= ~0x00020000u;
 }
 inline void FileOptions::clear_deprecated() {
   deprecated_ = false;
@@ -6840,13 +9489,13 @@ inline void FileOptions::set_deprecated(bool value) {
 
 // optional bool cc_enable_arenas = 31 [default = false];
 inline bool FileOptions::has_cc_enable_arenas() const {
-  return (_has_bits_[0] & 0x00002000u) != 0;
+  return (_has_bits_[0] & 0x00040000u) != 0;
 }
 inline void FileOptions::set_has_cc_enable_arenas() {
-  _has_bits_[0] |= 0x00002000u;
+  _has_bits_[0] |= 0x00040000u;
 }
 inline void FileOptions::clear_has_cc_enable_arenas() {
-  _has_bits_[0] &= ~0x00002000u;
+  _has_bits_[0] &= ~0x00040000u;
 }
 inline void FileOptions::clear_cc_enable_arenas() {
   cc_enable_arenas_ = false;
@@ -6873,46 +9522,52 @@ inline void FileOptions::clear_has_objc_class_prefix() {
   _has_bits_[0] &= ~0x00000008u;
 }
 inline void FileOptions::clear_objc_class_prefix() {
-  objc_class_prefix_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  objc_class_prefix_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_objc_class_prefix();
 }
 inline const ::std::string& FileOptions::objc_class_prefix() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.objc_class_prefix)
-  return objc_class_prefix_.GetNoArena();
+  return objc_class_prefix_.Get();
 }
 inline void FileOptions::set_objc_class_prefix(const ::std::string& value) {
   set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  objc_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.objc_class_prefix)
 }
 #if LANG_CXX11
 inline void FileOptions::set_objc_class_prefix(::std::string&& value) {
   set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  objc_class_prefix_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.objc_class_prefix)
 }
 #endif
 inline void FileOptions::set_objc_class_prefix(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  objc_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.objc_class_prefix)
 }
-inline void FileOptions::set_objc_class_prefix(const char* value, size_t size) {
+inline void FileOptions::set_objc_class_prefix(const char* value,
+    size_t size) {
   set_has_objc_class_prefix();
-  objc_class_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  objc_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.objc_class_prefix)
 }
 inline ::std::string* FileOptions::mutable_objc_class_prefix() {
   set_has_objc_class_prefix();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.objc_class_prefix)
-  return objc_class_prefix_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return objc_class_prefix_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_objc_class_prefix() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.objc_class_prefix)
+  if (!has_objc_class_prefix()) {
+    return NULL;
+  }
   clear_has_objc_class_prefix();
-  return objc_class_prefix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return objc_class_prefix_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_objc_class_prefix(::std::string* objc_class_prefix) {
   if (objc_class_prefix != NULL) {
@@ -6920,9 +9575,29 @@ inline void FileOptions::set_allocated_objc_class_prefix(::std::string* objc_cla
   } else {
     clear_has_objc_class_prefix();
   }
-  objc_class_prefix_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), objc_class_prefix);
+  objc_class_prefix_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), objc_class_prefix,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.objc_class_prefix)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_objc_class_prefix() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.objc_class_prefix)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_objc_class_prefix();
+  return objc_class_prefix_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_objc_class_prefix(
+    ::std::string* objc_class_prefix) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (objc_class_prefix != NULL) {
+    set_has_objc_class_prefix();
+  } else {
+    clear_has_objc_class_prefix();
+  }
+  objc_class_prefix_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      objc_class_prefix, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.objc_class_prefix)
+}
 
 // optional string csharp_namespace = 37;
 inline bool FileOptions::has_csharp_namespace() const {
@@ -6935,46 +9610,52 @@ inline void FileOptions::clear_has_csharp_namespace() {
   _has_bits_[0] &= ~0x00000010u;
 }
 inline void FileOptions::clear_csharp_namespace() {
-  csharp_namespace_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  csharp_namespace_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_csharp_namespace();
 }
 inline const ::std::string& FileOptions::csharp_namespace() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.csharp_namespace)
-  return csharp_namespace_.GetNoArena();
+  return csharp_namespace_.Get();
 }
 inline void FileOptions::set_csharp_namespace(const ::std::string& value) {
   set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  csharp_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.csharp_namespace)
 }
 #if LANG_CXX11
 inline void FileOptions::set_csharp_namespace(::std::string&& value) {
   set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  csharp_namespace_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.csharp_namespace)
 }
 #endif
 inline void FileOptions::set_csharp_namespace(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  csharp_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.csharp_namespace)
 }
-inline void FileOptions::set_csharp_namespace(const char* value, size_t size) {
+inline void FileOptions::set_csharp_namespace(const char* value,
+    size_t size) {
   set_has_csharp_namespace();
-  csharp_namespace_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  csharp_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.csharp_namespace)
 }
 inline ::std::string* FileOptions::mutable_csharp_namespace() {
   set_has_csharp_namespace();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.csharp_namespace)
-  return csharp_namespace_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return csharp_namespace_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_csharp_namespace() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.csharp_namespace)
+  if (!has_csharp_namespace()) {
+    return NULL;
+  }
   clear_has_csharp_namespace();
-  return csharp_namespace_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return csharp_namespace_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_csharp_namespace(::std::string* csharp_namespace) {
   if (csharp_namespace != NULL) {
@@ -6982,9 +9663,29 @@ inline void FileOptions::set_allocated_csharp_namespace(::std::string* csharp_na
   } else {
     clear_has_csharp_namespace();
   }
-  csharp_namespace_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), csharp_namespace);
+  csharp_namespace_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), csharp_namespace,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.csharp_namespace)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_csharp_namespace() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.csharp_namespace)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_csharp_namespace();
+  return csharp_namespace_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_csharp_namespace(
+    ::std::string* csharp_namespace) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (csharp_namespace != NULL) {
+    set_has_csharp_namespace();
+  } else {
+    clear_has_csharp_namespace();
+  }
+  csharp_namespace_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      csharp_namespace, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.csharp_namespace)
+}
 
 // optional string swift_prefix = 39;
 inline bool FileOptions::has_swift_prefix() const {
@@ -6997,46 +9698,52 @@ inline void FileOptions::clear_has_swift_prefix() {
   _has_bits_[0] &= ~0x00000020u;
 }
 inline void FileOptions::clear_swift_prefix() {
-  swift_prefix_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  swift_prefix_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_swift_prefix();
 }
 inline const ::std::string& FileOptions::swift_prefix() const {
   // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.swift_prefix)
-  return swift_prefix_.GetNoArena();
+  return swift_prefix_.Get();
 }
 inline void FileOptions::set_swift_prefix(const ::std::string& value) {
   set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  swift_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.swift_prefix)
 }
 #if LANG_CXX11
 inline void FileOptions::set_swift_prefix(::std::string&& value) {
   set_has_swift_prefix();
-  swift_prefix_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  swift_prefix_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.swift_prefix)
 }
 #endif
 inline void FileOptions::set_swift_prefix(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  swift_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.swift_prefix)
 }
-inline void FileOptions::set_swift_prefix(const char* value, size_t size) {
+inline void FileOptions::set_swift_prefix(const char* value,
+    size_t size) {
   set_has_swift_prefix();
-  swift_prefix_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  swift_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.swift_prefix)
 }
 inline ::std::string* FileOptions::mutable_swift_prefix() {
   set_has_swift_prefix();
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.swift_prefix)
-  return swift_prefix_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return swift_prefix_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* FileOptions::release_swift_prefix() {
   // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.swift_prefix)
+  if (!has_swift_prefix()) {
+    return NULL;
+  }
   clear_has_swift_prefix();
-  return swift_prefix_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return swift_prefix_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void FileOptions::set_allocated_swift_prefix(::std::string* swift_prefix) {
   if (swift_prefix != NULL) {
@@ -7044,9 +9751,381 @@ inline void FileOptions::set_allocated_swift_prefix(::std::string* swift_prefix)
   } else {
     clear_has_swift_prefix();
   }
-  swift_prefix_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), swift_prefix);
+  swift_prefix_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), swift_prefix,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.swift_prefix)
 }
+inline ::std::string* FileOptions::unsafe_arena_release_swift_prefix() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.swift_prefix)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_swift_prefix();
+  return swift_prefix_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_swift_prefix(
+    ::std::string* swift_prefix) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (swift_prefix != NULL) {
+    set_has_swift_prefix();
+  } else {
+    clear_has_swift_prefix();
+  }
+  swift_prefix_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      swift_prefix, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.swift_prefix)
+}
+
+// optional string php_class_prefix = 40;
+inline bool FileOptions::has_php_class_prefix() const {
+  return (_has_bits_[0] & 0x00000040u) != 0;
+}
+inline void FileOptions::set_has_php_class_prefix() {
+  _has_bits_[0] |= 0x00000040u;
+}
+inline void FileOptions::clear_has_php_class_prefix() {
+  _has_bits_[0] &= ~0x00000040u;
+}
+inline void FileOptions::clear_php_class_prefix() {
+  php_class_prefix_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  clear_has_php_class_prefix();
+}
+inline const ::std::string& FileOptions::php_class_prefix() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.php_class_prefix)
+  return php_class_prefix_.Get();
+}
+inline void FileOptions::set_php_class_prefix(const ::std::string& value) {
+  set_has_php_class_prefix();
+  php_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.php_class_prefix)
+}
+#if LANG_CXX11
+inline void FileOptions::set_php_class_prefix(::std::string&& value) {
+  set_has_php_class_prefix();
+  php_class_prefix_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.php_class_prefix)
+}
+#endif
+inline void FileOptions::set_php_class_prefix(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  set_has_php_class_prefix();
+  php_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.php_class_prefix)
+}
+inline void FileOptions::set_php_class_prefix(const char* value,
+    size_t size) {
+  set_has_php_class_prefix();
+  php_class_prefix_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.php_class_prefix)
+}
+inline ::std::string* FileOptions::mutable_php_class_prefix() {
+  set_has_php_class_prefix();
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.php_class_prefix)
+  return php_class_prefix_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline ::std::string* FileOptions::release_php_class_prefix() {
+  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.php_class_prefix)
+  if (!has_php_class_prefix()) {
+    return NULL;
+  }
+  clear_has_php_class_prefix();
+  return php_class_prefix_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline void FileOptions::set_allocated_php_class_prefix(::std::string* php_class_prefix) {
+  if (php_class_prefix != NULL) {
+    set_has_php_class_prefix();
+  } else {
+    clear_has_php_class_prefix();
+  }
+  php_class_prefix_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), php_class_prefix,
+      GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.php_class_prefix)
+}
+inline ::std::string* FileOptions::unsafe_arena_release_php_class_prefix() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.php_class_prefix)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_php_class_prefix();
+  return php_class_prefix_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_php_class_prefix(
+    ::std::string* php_class_prefix) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (php_class_prefix != NULL) {
+    set_has_php_class_prefix();
+  } else {
+    clear_has_php_class_prefix();
+  }
+  php_class_prefix_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      php_class_prefix, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.php_class_prefix)
+}
+
+// optional string php_namespace = 41;
+inline bool FileOptions::has_php_namespace() const {
+  return (_has_bits_[0] & 0x00000080u) != 0;
+}
+inline void FileOptions::set_has_php_namespace() {
+  _has_bits_[0] |= 0x00000080u;
+}
+inline void FileOptions::clear_has_php_namespace() {
+  _has_bits_[0] &= ~0x00000080u;
+}
+inline void FileOptions::clear_php_namespace() {
+  php_namespace_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  clear_has_php_namespace();
+}
+inline const ::std::string& FileOptions::php_namespace() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.php_namespace)
+  return php_namespace_.Get();
+}
+inline void FileOptions::set_php_namespace(const ::std::string& value) {
+  set_has_php_namespace();
+  php_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.php_namespace)
+}
+#if LANG_CXX11
+inline void FileOptions::set_php_namespace(::std::string&& value) {
+  set_has_php_namespace();
+  php_namespace_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.php_namespace)
+}
+#endif
+inline void FileOptions::set_php_namespace(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  set_has_php_namespace();
+  php_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.php_namespace)
+}
+inline void FileOptions::set_php_namespace(const char* value,
+    size_t size) {
+  set_has_php_namespace();
+  php_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.php_namespace)
+}
+inline ::std::string* FileOptions::mutable_php_namespace() {
+  set_has_php_namespace();
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.php_namespace)
+  return php_namespace_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline ::std::string* FileOptions::release_php_namespace() {
+  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.php_namespace)
+  if (!has_php_namespace()) {
+    return NULL;
+  }
+  clear_has_php_namespace();
+  return php_namespace_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline void FileOptions::set_allocated_php_namespace(::std::string* php_namespace) {
+  if (php_namespace != NULL) {
+    set_has_php_namespace();
+  } else {
+    clear_has_php_namespace();
+  }
+  php_namespace_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), php_namespace,
+      GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.php_namespace)
+}
+inline ::std::string* FileOptions::unsafe_arena_release_php_namespace() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.php_namespace)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_php_namespace();
+  return php_namespace_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_php_namespace(
+    ::std::string* php_namespace) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (php_namespace != NULL) {
+    set_has_php_namespace();
+  } else {
+    clear_has_php_namespace();
+  }
+  php_namespace_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      php_namespace, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.php_namespace)
+}
+
+// optional string php_metadata_namespace = 44;
+inline bool FileOptions::has_php_metadata_namespace() const {
+  return (_has_bits_[0] & 0x00000100u) != 0;
+}
+inline void FileOptions::set_has_php_metadata_namespace() {
+  _has_bits_[0] |= 0x00000100u;
+}
+inline void FileOptions::clear_has_php_metadata_namespace() {
+  _has_bits_[0] &= ~0x00000100u;
+}
+inline void FileOptions::clear_php_metadata_namespace() {
+  php_metadata_namespace_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  clear_has_php_metadata_namespace();
+}
+inline const ::std::string& FileOptions::php_metadata_namespace() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.php_metadata_namespace)
+  return php_metadata_namespace_.Get();
+}
+inline void FileOptions::set_php_metadata_namespace(const ::std::string& value) {
+  set_has_php_metadata_namespace();
+  php_metadata_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.php_metadata_namespace)
+}
+#if LANG_CXX11
+inline void FileOptions::set_php_metadata_namespace(::std::string&& value) {
+  set_has_php_metadata_namespace();
+  php_metadata_namespace_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.php_metadata_namespace)
+}
+#endif
+inline void FileOptions::set_php_metadata_namespace(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  set_has_php_metadata_namespace();
+  php_metadata_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.php_metadata_namespace)
+}
+inline void FileOptions::set_php_metadata_namespace(const char* value,
+    size_t size) {
+  set_has_php_metadata_namespace();
+  php_metadata_namespace_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.php_metadata_namespace)
+}
+inline ::std::string* FileOptions::mutable_php_metadata_namespace() {
+  set_has_php_metadata_namespace();
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.php_metadata_namespace)
+  return php_metadata_namespace_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline ::std::string* FileOptions::release_php_metadata_namespace() {
+  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.php_metadata_namespace)
+  if (!has_php_metadata_namespace()) {
+    return NULL;
+  }
+  clear_has_php_metadata_namespace();
+  return php_metadata_namespace_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline void FileOptions::set_allocated_php_metadata_namespace(::std::string* php_metadata_namespace) {
+  if (php_metadata_namespace != NULL) {
+    set_has_php_metadata_namespace();
+  } else {
+    clear_has_php_metadata_namespace();
+  }
+  php_metadata_namespace_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), php_metadata_namespace,
+      GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.php_metadata_namespace)
+}
+inline ::std::string* FileOptions::unsafe_arena_release_php_metadata_namespace() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.php_metadata_namespace)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_php_metadata_namespace();
+  return php_metadata_namespace_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_php_metadata_namespace(
+    ::std::string* php_metadata_namespace) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (php_metadata_namespace != NULL) {
+    set_has_php_metadata_namespace();
+  } else {
+    clear_has_php_metadata_namespace();
+  }
+  php_metadata_namespace_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      php_metadata_namespace, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.php_metadata_namespace)
+}
+
+// optional string ruby_package = 45;
+inline bool FileOptions::has_ruby_package() const {
+  return (_has_bits_[0] & 0x00000200u) != 0;
+}
+inline void FileOptions::set_has_ruby_package() {
+  _has_bits_[0] |= 0x00000200u;
+}
+inline void FileOptions::clear_has_ruby_package() {
+  _has_bits_[0] &= ~0x00000200u;
+}
+inline void FileOptions::clear_ruby_package() {
+  ruby_package_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  clear_has_ruby_package();
+}
+inline const ::std::string& FileOptions::ruby_package() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.ruby_package)
+  return ruby_package_.Get();
+}
+inline void FileOptions::set_ruby_package(const ::std::string& value) {
+  set_has_ruby_package();
+  ruby_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set:google.protobuf.FileOptions.ruby_package)
+}
+#if LANG_CXX11
+inline void FileOptions::set_ruby_package(::std::string&& value) {
+  set_has_ruby_package();
+  ruby_package_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.FileOptions.ruby_package)
+}
+#endif
+inline void FileOptions::set_ruby_package(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
+  set_has_ruby_package();
+  ruby_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_char:google.protobuf.FileOptions.ruby_package)
+}
+inline void FileOptions::set_ruby_package(const char* value,
+    size_t size) {
+  set_has_ruby_package();
+  ruby_package_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FileOptions.ruby_package)
+}
+inline ::std::string* FileOptions::mutable_ruby_package() {
+  set_has_ruby_package();
+  // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.ruby_package)
+  return ruby_package_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline ::std::string* FileOptions::release_ruby_package() {
+  // @@protoc_insertion_point(field_release:google.protobuf.FileOptions.ruby_package)
+  if (!has_ruby_package()) {
+    return NULL;
+  }
+  clear_has_ruby_package();
+  return ruby_package_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+}
+inline void FileOptions::set_allocated_ruby_package(::std::string* ruby_package) {
+  if (ruby_package != NULL) {
+    set_has_ruby_package();
+  } else {
+    clear_has_ruby_package();
+  }
+  ruby_package_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ruby_package,
+      GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.FileOptions.ruby_package)
+}
+inline ::std::string* FileOptions::unsafe_arena_release_ruby_package() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.FileOptions.ruby_package)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_ruby_package();
+  return ruby_package_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void FileOptions::unsafe_arena_set_allocated_ruby_package(
+    ::std::string* ruby_package) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (ruby_package != NULL) {
+    set_has_ruby_package();
+  } else {
+    clear_has_ruby_package();
+  }
+  ruby_package_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      ruby_package, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.FileOptions.ruby_package)
+}
 
 // repeated .google.protobuf.UninterpretedOption uninterpreted_option = 999;
 inline int FileOptions::uninterpreted_option_size() const {
@@ -7055,23 +10134,23 @@ inline int FileOptions::uninterpreted_option_size() const {
 inline void FileOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& FileOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* FileOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FileOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* FileOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FileOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 FileOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FileOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& FileOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FileOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* FileOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FileOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 FileOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FileOptions.uninterpreted_option)
@@ -7185,23 +10264,23 @@ inline int MessageOptions::uninterpreted_option_size() const {
 inline void MessageOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& MessageOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* MessageOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.MessageOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* MessageOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.MessageOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 MessageOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.MessageOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& MessageOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.MessageOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* MessageOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.MessageOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 MessageOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.MessageOptions.uninterpreted_option)
@@ -7239,13 +10318,13 @@ inline void FieldOptions::set_ctype(::google::protobuf::FieldOptions_CType value
 
 // optional bool packed = 2;
 inline bool FieldOptions::has_packed() const {
-  return (_has_bits_[0] & 0x00000004u) != 0;
+  return (_has_bits_[0] & 0x00000002u) != 0;
 }
 inline void FieldOptions::set_has_packed() {
-  _has_bits_[0] |= 0x00000004u;
+  _has_bits_[0] |= 0x00000002u;
 }
 inline void FieldOptions::clear_has_packed() {
-  _has_bits_[0] &= ~0x00000004u;
+  _has_bits_[0] &= ~0x00000002u;
 }
 inline void FieldOptions::clear_packed() {
   packed_ = false;
@@ -7263,13 +10342,13 @@ inline void FieldOptions::set_packed(bool value) {
 
 // optional .google.protobuf.FieldOptions.JSType jstype = 6 [default = JS_NORMAL];
 inline bool FieldOptions::has_jstype() const {
-  return (_has_bits_[0] & 0x00000002u) != 0;
+  return (_has_bits_[0] & 0x00000020u) != 0;
 }
 inline void FieldOptions::set_has_jstype() {
-  _has_bits_[0] |= 0x00000002u;
+  _has_bits_[0] |= 0x00000020u;
 }
 inline void FieldOptions::clear_has_jstype() {
-  _has_bits_[0] &= ~0x00000002u;
+  _has_bits_[0] &= ~0x00000020u;
 }
 inline void FieldOptions::clear_jstype() {
   jstype_ = 0;
@@ -7288,13 +10367,13 @@ inline void FieldOptions::set_jstype(::google::protobuf::FieldOptions_JSType val
 
 // optional bool lazy = 5 [default = false];
 inline bool FieldOptions::has_lazy() const {
-  return (_has_bits_[0] & 0x00000008u) != 0;
+  return (_has_bits_[0] & 0x00000004u) != 0;
 }
 inline void FieldOptions::set_has_lazy() {
-  _has_bits_[0] |= 0x00000008u;
+  _has_bits_[0] |= 0x00000004u;
 }
 inline void FieldOptions::clear_has_lazy() {
-  _has_bits_[0] &= ~0x00000008u;
+  _has_bits_[0] &= ~0x00000004u;
 }
 inline void FieldOptions::clear_lazy() {
   lazy_ = false;
@@ -7312,13 +10391,13 @@ inline void FieldOptions::set_lazy(bool value) {
 
 // optional bool deprecated = 3 [default = false];
 inline bool FieldOptions::has_deprecated() const {
-  return (_has_bits_[0] & 0x00000010u) != 0;
+  return (_has_bits_[0] & 0x00000008u) != 0;
 }
 inline void FieldOptions::set_has_deprecated() {
-  _has_bits_[0] |= 0x00000010u;
+  _has_bits_[0] |= 0x00000008u;
 }
 inline void FieldOptions::clear_has_deprecated() {
-  _has_bits_[0] &= ~0x00000010u;
+  _has_bits_[0] &= ~0x00000008u;
 }
 inline void FieldOptions::clear_deprecated() {
   deprecated_ = false;
@@ -7336,13 +10415,13 @@ inline void FieldOptions::set_deprecated(bool value) {
 
 // optional bool weak = 10 [default = false];
 inline bool FieldOptions::has_weak() const {
-  return (_has_bits_[0] & 0x00000020u) != 0;
+  return (_has_bits_[0] & 0x00000010u) != 0;
 }
 inline void FieldOptions::set_has_weak() {
-  _has_bits_[0] |= 0x00000020u;
+  _has_bits_[0] |= 0x00000010u;
 }
 inline void FieldOptions::clear_has_weak() {
-  _has_bits_[0] &= ~0x00000020u;
+  _has_bits_[0] &= ~0x00000010u;
 }
 inline void FieldOptions::clear_weak() {
   weak_ = false;
@@ -7365,23 +10444,23 @@ inline int FieldOptions::uninterpreted_option_size() const {
 inline void FieldOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& FieldOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* FieldOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.FieldOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* FieldOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.FieldOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 FieldOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.FieldOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& FieldOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.FieldOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* FieldOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.FieldOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 FieldOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.FieldOptions.uninterpreted_option)
@@ -7399,23 +10478,23 @@ inline int OneofOptions::uninterpreted_option_size() const {
 inline void OneofOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& OneofOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* OneofOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.OneofOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* OneofOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.OneofOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 OneofOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.OneofOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& OneofOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.OneofOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* OneofOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.OneofOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 OneofOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.OneofOptions.uninterpreted_option)
@@ -7481,23 +10560,23 @@ inline int EnumOptions::uninterpreted_option_size() const {
 inline void EnumOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& EnumOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* EnumOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* EnumOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 EnumOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& EnumOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* EnumOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 EnumOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.EnumOptions.uninterpreted_option)
@@ -7539,23 +10618,23 @@ inline int EnumValueOptions::uninterpreted_option_size() const {
 inline void EnumValueOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& EnumValueOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* EnumValueOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValueOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* EnumValueOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumValueOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 EnumValueOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumValueOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& EnumValueOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumValueOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* EnumValueOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumValueOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 EnumValueOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.EnumValueOptions.uninterpreted_option)
@@ -7597,23 +10676,23 @@ inline int ServiceOptions::uninterpreted_option_size() const {
 inline void ServiceOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& ServiceOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* ServiceOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.ServiceOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* ServiceOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ServiceOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 ServiceOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.ServiceOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& ServiceOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.ServiceOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* ServiceOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.ServiceOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 ServiceOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.ServiceOptions.uninterpreted_option)
@@ -7680,23 +10759,23 @@ inline int MethodOptions::uninterpreted_option_size() const {
 inline void MethodOptions::clear_uninterpreted_option() {
   uninterpreted_option_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption& MethodOptions::uninterpreted_option(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption* MethodOptions::mutable_uninterpreted_option(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.MethodOptions.uninterpreted_option)
   return uninterpreted_option_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption* MethodOptions::add_uninterpreted_option() {
-  // @@protoc_insertion_point(field_add:google.protobuf.MethodOptions.uninterpreted_option)
-  return uninterpreted_option_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >*
 MethodOptions::mutable_uninterpreted_option() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.MethodOptions.uninterpreted_option)
   return &uninterpreted_option_;
 }
+inline const ::google::protobuf::UninterpretedOption& MethodOptions::uninterpreted_option(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.MethodOptions.uninterpreted_option)
+  return uninterpreted_option_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption* MethodOptions::add_uninterpreted_option() {
+  // @@protoc_insertion_point(field_add:google.protobuf.MethodOptions.uninterpreted_option)
+  return uninterpreted_option_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption >&
 MethodOptions::uninterpreted_option() const {
   // @@protoc_insertion_point(field_list:google.protobuf.MethodOptions.uninterpreted_option)
@@ -7718,46 +10797,52 @@ inline void UninterpretedOption_NamePart::clear_has_name_part() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void UninterpretedOption_NamePart::clear_name_part() {
-  name_part_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  name_part_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_name_part();
 }
 inline const ::std::string& UninterpretedOption_NamePart::name_part() const {
   // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.NamePart.name_part)
-  return name_part_.GetNoArena();
+  return name_part_.Get();
 }
 inline void UninterpretedOption_NamePart::set_name_part(const ::std::string& value) {
   set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  name_part_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.NamePart.name_part)
 }
 #if LANG_CXX11
 inline void UninterpretedOption_NamePart::set_name_part(::std::string&& value) {
   set_has_name_part();
-  name_part_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  name_part_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.NamePart.name_part)
 }
 #endif
 inline void UninterpretedOption_NamePart::set_name_part(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  name_part_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.NamePart.name_part)
 }
-inline void UninterpretedOption_NamePart::set_name_part(const char* value, size_t size) {
+inline void UninterpretedOption_NamePart::set_name_part(const char* value,
+    size_t size) {
   set_has_name_part();
-  name_part_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  name_part_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.NamePart.name_part)
 }
 inline ::std::string* UninterpretedOption_NamePart::mutable_name_part() {
   set_has_name_part();
   // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.NamePart.name_part)
-  return name_part_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_part_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* UninterpretedOption_NamePart::release_name_part() {
   // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.NamePart.name_part)
+  if (!has_name_part()) {
+    return NULL;
+  }
   clear_has_name_part();
-  return name_part_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return name_part_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void UninterpretedOption_NamePart::set_allocated_name_part(::std::string* name_part) {
   if (name_part != NULL) {
@@ -7765,9 +10850,29 @@ inline void UninterpretedOption_NamePart::set_allocated_name_part(::std::string*
   } else {
     clear_has_name_part();
   }
-  name_part_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name_part);
+  name_part_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name_part,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.NamePart.name_part)
 }
+inline ::std::string* UninterpretedOption_NamePart::unsafe_arena_release_name_part() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.UninterpretedOption.NamePart.name_part)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_name_part();
+  return name_part_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void UninterpretedOption_NamePart::unsafe_arena_set_allocated_name_part(
+    ::std::string* name_part) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (name_part != NULL) {
+    set_has_name_part();
+  } else {
+    clear_has_name_part();
+  }
+  name_part_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      name_part, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.UninterpretedOption.NamePart.name_part)
+}
 
 // required bool is_extension = 2;
 inline bool UninterpretedOption_NamePart::has_is_extension() const {
@@ -7804,23 +10909,23 @@ inline int UninterpretedOption::name_size() const {
 inline void UninterpretedOption::clear_name() {
   name_.Clear();
 }
-inline const ::google::protobuf::UninterpretedOption_NamePart& UninterpretedOption::name(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.name)
-  return name_.Get(index);
-}
 inline ::google::protobuf::UninterpretedOption_NamePart* UninterpretedOption::mutable_name(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.name)
   return name_.Mutable(index);
 }
-inline ::google::protobuf::UninterpretedOption_NamePart* UninterpretedOption::add_name() {
-  // @@protoc_insertion_point(field_add:google.protobuf.UninterpretedOption.name)
-  return name_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >*
 UninterpretedOption::mutable_name() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.UninterpretedOption.name)
   return &name_;
 }
+inline const ::google::protobuf::UninterpretedOption_NamePart& UninterpretedOption::name(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.name)
+  return name_.Get(index);
+}
+inline ::google::protobuf::UninterpretedOption_NamePart* UninterpretedOption::add_name() {
+  // @@protoc_insertion_point(field_add:google.protobuf.UninterpretedOption.name)
+  return name_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::UninterpretedOption_NamePart >&
 UninterpretedOption::name() const {
   // @@protoc_insertion_point(field_list:google.protobuf.UninterpretedOption.name)
@@ -7838,46 +10943,52 @@ inline void UninterpretedOption::clear_has_identifier_value() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void UninterpretedOption::clear_identifier_value() {
-  identifier_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  identifier_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_identifier_value();
 }
 inline const ::std::string& UninterpretedOption::identifier_value() const {
   // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.identifier_value)
-  return identifier_value_.GetNoArena();
+  return identifier_value_.Get();
 }
 inline void UninterpretedOption::set_identifier_value(const ::std::string& value) {
   set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  identifier_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.identifier_value)
 }
 #if LANG_CXX11
 inline void UninterpretedOption::set_identifier_value(::std::string&& value) {
   set_has_identifier_value();
-  identifier_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  identifier_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.identifier_value)
 }
 #endif
 inline void UninterpretedOption::set_identifier_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  identifier_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.identifier_value)
 }
-inline void UninterpretedOption::set_identifier_value(const char* value, size_t size) {
+inline void UninterpretedOption::set_identifier_value(const char* value,
+    size_t size) {
   set_has_identifier_value();
-  identifier_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  identifier_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.identifier_value)
 }
 inline ::std::string* UninterpretedOption::mutable_identifier_value() {
   set_has_identifier_value();
   // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.identifier_value)
-  return identifier_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return identifier_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* UninterpretedOption::release_identifier_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.identifier_value)
+  if (!has_identifier_value()) {
+    return NULL;
+  }
   clear_has_identifier_value();
-  return identifier_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return identifier_value_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void UninterpretedOption::set_allocated_identifier_value(::std::string* identifier_value) {
   if (identifier_value != NULL) {
@@ -7885,9 +10996,29 @@ inline void UninterpretedOption::set_allocated_identifier_value(::std::string* i
   } else {
     clear_has_identifier_value();
   }
-  identifier_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), identifier_value);
+  identifier_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), identifier_value,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.identifier_value)
 }
+inline ::std::string* UninterpretedOption::unsafe_arena_release_identifier_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.UninterpretedOption.identifier_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_identifier_value();
+  return identifier_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void UninterpretedOption::unsafe_arena_set_allocated_identifier_value(
+    ::std::string* identifier_value) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (identifier_value != NULL) {
+    set_has_identifier_value();
+  } else {
+    clear_has_identifier_value();
+  }
+  identifier_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      identifier_value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.UninterpretedOption.identifier_value)
+}
 
 // optional uint64 positive_int_value = 4;
 inline bool UninterpretedOption::has_positive_int_value() const {
@@ -7972,46 +11103,52 @@ inline void UninterpretedOption::clear_has_string_value() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void UninterpretedOption::clear_string_value() {
-  string_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  string_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_string_value();
 }
 inline const ::std::string& UninterpretedOption::string_value() const {
   // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.string_value)
-  return string_value_.GetNoArena();
+  return string_value_.Get();
 }
 inline void UninterpretedOption::set_string_value(const ::std::string& value) {
   set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.string_value)
 }
 #if LANG_CXX11
 inline void UninterpretedOption::set_string_value(::std::string&& value) {
   set_has_string_value();
-  string_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  string_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.string_value)
 }
 #endif
 inline void UninterpretedOption::set_string_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.string_value)
 }
-inline void UninterpretedOption::set_string_value(const void* value, size_t size) {
+inline void UninterpretedOption::set_string_value(const void* value,
+    size_t size) {
   set_has_string_value();
-  string_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.string_value)
 }
 inline ::std::string* UninterpretedOption::mutable_string_value() {
   set_has_string_value();
   // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.string_value)
-  return string_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return string_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* UninterpretedOption::release_string_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.string_value)
+  if (!has_string_value()) {
+    return NULL;
+  }
   clear_has_string_value();
-  return string_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return string_value_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void UninterpretedOption::set_allocated_string_value(::std::string* string_value) {
   if (string_value != NULL) {
@@ -8019,9 +11156,29 @@ inline void UninterpretedOption::set_allocated_string_value(::std::string* strin
   } else {
     clear_has_string_value();
   }
-  string_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), string_value);
+  string_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), string_value,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.string_value)
 }
+inline ::std::string* UninterpretedOption::unsafe_arena_release_string_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.UninterpretedOption.string_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_string_value();
+  return string_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void UninterpretedOption::unsafe_arena_set_allocated_string_value(
+    ::std::string* string_value) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (string_value != NULL) {
+    set_has_string_value();
+  } else {
+    clear_has_string_value();
+  }
+  string_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      string_value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.UninterpretedOption.string_value)
+}
 
 // optional string aggregate_value = 8;
 inline bool UninterpretedOption::has_aggregate_value() const {
@@ -8034,46 +11191,52 @@ inline void UninterpretedOption::clear_has_aggregate_value() {
   _has_bits_[0] &= ~0x00000004u;
 }
 inline void UninterpretedOption::clear_aggregate_value() {
-  aggregate_value_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  aggregate_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_aggregate_value();
 }
 inline const ::std::string& UninterpretedOption::aggregate_value() const {
   // @@protoc_insertion_point(field_get:google.protobuf.UninterpretedOption.aggregate_value)
-  return aggregate_value_.GetNoArena();
+  return aggregate_value_.Get();
 }
 inline void UninterpretedOption::set_aggregate_value(const ::std::string& value) {
   set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  aggregate_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.UninterpretedOption.aggregate_value)
 }
 #if LANG_CXX11
 inline void UninterpretedOption::set_aggregate_value(::std::string&& value) {
   set_has_aggregate_value();
-  aggregate_value_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  aggregate_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.UninterpretedOption.aggregate_value)
 }
 #endif
 inline void UninterpretedOption::set_aggregate_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  aggregate_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.UninterpretedOption.aggregate_value)
 }
-inline void UninterpretedOption::set_aggregate_value(const char* value, size_t size) {
+inline void UninterpretedOption::set_aggregate_value(const char* value,
+    size_t size) {
   set_has_aggregate_value();
-  aggregate_value_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  aggregate_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.UninterpretedOption.aggregate_value)
 }
 inline ::std::string* UninterpretedOption::mutable_aggregate_value() {
   set_has_aggregate_value();
   // @@protoc_insertion_point(field_mutable:google.protobuf.UninterpretedOption.aggregate_value)
-  return aggregate_value_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return aggregate_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* UninterpretedOption::release_aggregate_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.UninterpretedOption.aggregate_value)
+  if (!has_aggregate_value()) {
+    return NULL;
+  }
   clear_has_aggregate_value();
-  return aggregate_value_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return aggregate_value_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void UninterpretedOption::set_allocated_aggregate_value(::std::string* aggregate_value) {
   if (aggregate_value != NULL) {
@@ -8081,9 +11244,29 @@ inline void UninterpretedOption::set_allocated_aggregate_value(::std::string* ag
   } else {
     clear_has_aggregate_value();
   }
-  aggregate_value_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), aggregate_value);
+  aggregate_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), aggregate_value,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.UninterpretedOption.aggregate_value)
 }
+inline ::std::string* UninterpretedOption::unsafe_arena_release_aggregate_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.UninterpretedOption.aggregate_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_aggregate_value();
+  return aggregate_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void UninterpretedOption::unsafe_arena_set_allocated_aggregate_value(
+    ::std::string* aggregate_value) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (aggregate_value != NULL) {
+    set_has_aggregate_value();
+  } else {
+    clear_has_aggregate_value();
+  }
+  aggregate_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      aggregate_value, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.UninterpretedOption.aggregate_value)
+}
 
 // -------------------------------------------------------------------
 
@@ -8160,46 +11343,52 @@ inline void SourceCodeInfo_Location::clear_has_leading_comments() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void SourceCodeInfo_Location::clear_leading_comments() {
-  leading_comments_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  leading_comments_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_leading_comments();
 }
 inline const ::std::string& SourceCodeInfo_Location::leading_comments() const {
   // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.leading_comments)
-  return leading_comments_.GetNoArena();
+  return leading_comments_.Get();
 }
 inline void SourceCodeInfo_Location::set_leading_comments(const ::std::string& value) {
   set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  leading_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.leading_comments)
 }
 #if LANG_CXX11
 inline void SourceCodeInfo_Location::set_leading_comments(::std::string&& value) {
   set_has_leading_comments();
-  leading_comments_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  leading_comments_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.SourceCodeInfo.Location.leading_comments)
 }
 #endif
 inline void SourceCodeInfo_Location::set_leading_comments(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  leading_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.leading_comments)
 }
-inline void SourceCodeInfo_Location::set_leading_comments(const char* value, size_t size) {
+inline void SourceCodeInfo_Location::set_leading_comments(const char* value,
+    size_t size) {
   set_has_leading_comments();
-  leading_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  leading_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceCodeInfo.Location.leading_comments)
 }
 inline ::std::string* SourceCodeInfo_Location::mutable_leading_comments() {
   set_has_leading_comments();
   // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.Location.leading_comments)
-  return leading_comments_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return leading_comments_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* SourceCodeInfo_Location::release_leading_comments() {
   // @@protoc_insertion_point(field_release:google.protobuf.SourceCodeInfo.Location.leading_comments)
+  if (!has_leading_comments()) {
+    return NULL;
+  }
   clear_has_leading_comments();
-  return leading_comments_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return leading_comments_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void SourceCodeInfo_Location::set_allocated_leading_comments(::std::string* leading_comments) {
   if (leading_comments != NULL) {
@@ -8207,9 +11396,29 @@ inline void SourceCodeInfo_Location::set_allocated_leading_comments(::std::strin
   } else {
     clear_has_leading_comments();
   }
-  leading_comments_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), leading_comments);
+  leading_comments_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), leading_comments,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceCodeInfo.Location.leading_comments)
 }
+inline ::std::string* SourceCodeInfo_Location::unsafe_arena_release_leading_comments() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.SourceCodeInfo.Location.leading_comments)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_leading_comments();
+  return leading_comments_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void SourceCodeInfo_Location::unsafe_arena_set_allocated_leading_comments(
+    ::std::string* leading_comments) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (leading_comments != NULL) {
+    set_has_leading_comments();
+  } else {
+    clear_has_leading_comments();
+  }
+  leading_comments_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      leading_comments, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.SourceCodeInfo.Location.leading_comments)
+}
 
 // optional string trailing_comments = 4;
 inline bool SourceCodeInfo_Location::has_trailing_comments() const {
@@ -8222,46 +11431,52 @@ inline void SourceCodeInfo_Location::clear_has_trailing_comments() {
   _has_bits_[0] &= ~0x00000002u;
 }
 inline void SourceCodeInfo_Location::clear_trailing_comments() {
-  trailing_comments_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  trailing_comments_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_trailing_comments();
 }
 inline const ::std::string& SourceCodeInfo_Location::trailing_comments() const {
   // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-  return trailing_comments_.GetNoArena();
+  return trailing_comments_.Get();
 }
 inline void SourceCodeInfo_Location::set_trailing_comments(const ::std::string& value) {
   set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  trailing_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.SourceCodeInfo.Location.trailing_comments)
 }
 #if LANG_CXX11
 inline void SourceCodeInfo_Location::set_trailing_comments(::std::string&& value) {
   set_has_trailing_comments();
-  trailing_comments_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  trailing_comments_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.SourceCodeInfo.Location.trailing_comments)
 }
 #endif
 inline void SourceCodeInfo_Location::set_trailing_comments(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  trailing_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.trailing_comments)
 }
-inline void SourceCodeInfo_Location::set_trailing_comments(const char* value, size_t size) {
+inline void SourceCodeInfo_Location::set_trailing_comments(const char* value,
+    size_t size) {
   set_has_trailing_comments();
-  trailing_comments_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  trailing_comments_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceCodeInfo.Location.trailing_comments)
 }
 inline ::std::string* SourceCodeInfo_Location::mutable_trailing_comments() {
   set_has_trailing_comments();
   // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.Location.trailing_comments)
-  return trailing_comments_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return trailing_comments_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* SourceCodeInfo_Location::release_trailing_comments() {
   // @@protoc_insertion_point(field_release:google.protobuf.SourceCodeInfo.Location.trailing_comments)
+  if (!has_trailing_comments()) {
+    return NULL;
+  }
   clear_has_trailing_comments();
-  return trailing_comments_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return trailing_comments_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void SourceCodeInfo_Location::set_allocated_trailing_comments(::std::string* trailing_comments) {
   if (trailing_comments != NULL) {
@@ -8269,9 +11484,29 @@ inline void SourceCodeInfo_Location::set_allocated_trailing_comments(::std::stri
   } else {
     clear_has_trailing_comments();
   }
-  trailing_comments_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), trailing_comments);
+  trailing_comments_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), trailing_comments,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceCodeInfo.Location.trailing_comments)
 }
+inline ::std::string* SourceCodeInfo_Location::unsafe_arena_release_trailing_comments() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.SourceCodeInfo.Location.trailing_comments)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_trailing_comments();
+  return trailing_comments_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void SourceCodeInfo_Location::unsafe_arena_set_allocated_trailing_comments(
+    ::std::string* trailing_comments) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (trailing_comments != NULL) {
+    set_has_trailing_comments();
+  } else {
+    clear_has_trailing_comments();
+  }
+  trailing_comments_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      trailing_comments, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.SourceCodeInfo.Location.trailing_comments)
+}
 
 // repeated string leading_detached_comments = 6;
 inline int SourceCodeInfo_Location::leading_detached_comments_size() const {
@@ -8299,6 +11534,7 @@ inline void SourceCodeInfo_Location::set_leading_detached_comments(int index, ::
 }
 #endif
 inline void SourceCodeInfo_Location::set_leading_detached_comments(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   leading_detached_comments_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
 }
@@ -8317,11 +11553,12 @@ inline void SourceCodeInfo_Location::add_leading_detached_comments(const ::std::
 }
 #if LANG_CXX11
 inline void SourceCodeInfo_Location::add_leading_detached_comments(::std::string&& value) {
-  leading_detached_comments_.Add()->assign(std::move(value));
+  leading_detached_comments_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
 }
 #endif
 inline void SourceCodeInfo_Location::add_leading_detached_comments(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   leading_detached_comments_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.SourceCodeInfo.Location.leading_detached_comments)
 }
@@ -8351,23 +11588,23 @@ inline int SourceCodeInfo::location_size() const {
 inline void SourceCodeInfo::clear_location() {
   location_.Clear();
 }
-inline const ::google::protobuf::SourceCodeInfo_Location& SourceCodeInfo::location(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.location)
-  return location_.Get(index);
-}
 inline ::google::protobuf::SourceCodeInfo_Location* SourceCodeInfo::mutable_location(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.SourceCodeInfo.location)
   return location_.Mutable(index);
 }
-inline ::google::protobuf::SourceCodeInfo_Location* SourceCodeInfo::add_location() {
-  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.location)
-  return location_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >*
 SourceCodeInfo::mutable_location() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.SourceCodeInfo.location)
   return &location_;
 }
+inline const ::google::protobuf::SourceCodeInfo_Location& SourceCodeInfo::location(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.SourceCodeInfo.location)
+  return location_.Get(index);
+}
+inline ::google::protobuf::SourceCodeInfo_Location* SourceCodeInfo::add_location() {
+  // @@protoc_insertion_point(field_add:google.protobuf.SourceCodeInfo.location)
+  return location_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::SourceCodeInfo_Location >&
 SourceCodeInfo::location() const {
   // @@protoc_insertion_point(field_list:google.protobuf.SourceCodeInfo.location)
@@ -8419,46 +11656,52 @@ inline void GeneratedCodeInfo_Annotation::clear_has_source_file() {
   _has_bits_[0] &= ~0x00000001u;
 }
 inline void GeneratedCodeInfo_Annotation::clear_source_file() {
-  source_file_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  source_file_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   clear_has_source_file();
 }
 inline const ::std::string& GeneratedCodeInfo_Annotation::source_file() const {
   // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-  return source_file_.GetNoArena();
+  return source_file_.Get();
 }
 inline void GeneratedCodeInfo_Annotation::set_source_file(const ::std::string& value) {
   set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
+  source_file_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
 }
 #if LANG_CXX11
 inline void GeneratedCodeInfo_Annotation::set_source_file(::std::string&& value) {
   set_has_source_file();
-  source_file_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
+  source_file_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_rvalue:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
 }
 #endif
 inline void GeneratedCodeInfo_Annotation::set_source_file(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
+  source_file_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
+              GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_char:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
 }
-inline void GeneratedCodeInfo_Annotation::set_source_file(const char* value, size_t size) {
+inline void GeneratedCodeInfo_Annotation::set_source_file(const char* value,
+    size_t size) {
   set_has_source_file();
-  source_file_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
+  source_file_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
 }
 inline ::std::string* GeneratedCodeInfo_Annotation::mutable_source_file() {
   set_has_source_file();
   // @@protoc_insertion_point(field_mutable:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
-  return source_file_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return source_file_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline ::std::string* GeneratedCodeInfo_Annotation::release_source_file() {
   // @@protoc_insertion_point(field_release:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
+  if (!has_source_file()) {
+    return NULL;
+  }
   clear_has_source_file();
-  return source_file_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  return source_file_.ReleaseNonDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
 inline void GeneratedCodeInfo_Annotation::set_allocated_source_file(::std::string* source_file) {
   if (source_file != NULL) {
@@ -8466,9 +11709,29 @@ inline void GeneratedCodeInfo_Annotation::set_allocated_source_file(::std::strin
   } else {
     clear_has_source_file();
   }
-  source_file_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), source_file);
+  source_file_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), source_file,
+      GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
 }
+inline ::std::string* GeneratedCodeInfo_Annotation::unsafe_arena_release_source_file() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  clear_has_source_file();
+  return source_file_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
+inline void GeneratedCodeInfo_Annotation::unsafe_arena_set_allocated_source_file(
+    ::std::string* source_file) {
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (source_file != NULL) {
+    set_has_source_file();
+  } else {
+    clear_has_source_file();
+  }
+  source_file_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      source_file, GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.GeneratedCodeInfo.Annotation.source_file)
+}
 
 // optional int32 begin = 3;
 inline bool GeneratedCodeInfo_Annotation::has_begin() const {
@@ -8529,30 +11792,36 @@ inline int GeneratedCodeInfo::annotation_size() const {
 inline void GeneratedCodeInfo::clear_annotation() {
   annotation_.Clear();
 }
-inline const ::google::protobuf::GeneratedCodeInfo_Annotation& GeneratedCodeInfo::annotation(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_.Get(index);
-}
 inline ::google::protobuf::GeneratedCodeInfo_Annotation* GeneratedCodeInfo::mutable_annotation(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.GeneratedCodeInfo.annotation)
   return annotation_.Mutable(index);
 }
-inline ::google::protobuf::GeneratedCodeInfo_Annotation* GeneratedCodeInfo::add_annotation() {
-  // @@protoc_insertion_point(field_add:google.protobuf.GeneratedCodeInfo.annotation)
-  return annotation_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >*
 GeneratedCodeInfo::mutable_annotation() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.GeneratedCodeInfo.annotation)
   return &annotation_;
 }
+inline const ::google::protobuf::GeneratedCodeInfo_Annotation& GeneratedCodeInfo::annotation(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.GeneratedCodeInfo.annotation)
+  return annotation_.Get(index);
+}
+inline ::google::protobuf::GeneratedCodeInfo_Annotation* GeneratedCodeInfo::add_annotation() {
+  // @@protoc_insertion_point(field_add:google.protobuf.GeneratedCodeInfo.annotation)
+  return annotation_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::GeneratedCodeInfo_Annotation >&
 GeneratedCodeInfo::annotation() const {
   // @@protoc_insertion_point(field_list:google.protobuf.GeneratedCodeInfo.annotation)
   return annotation_;
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
+// -------------------------------------------------------------------
+
+// -------------------------------------------------------------------
+
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -8604,40 +11873,38 @@ GeneratedCodeInfo::annotation() const {
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
-#ifndef SWIG
 namespace google {
 namespace protobuf {
 
-template <> struct is_proto_enum< ::google::protobuf::FieldDescriptorProto_Type> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::FieldDescriptorProto_Type> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::FieldDescriptorProto_Type>() {
   return ::google::protobuf::FieldDescriptorProto_Type_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::FieldDescriptorProto_Label> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::FieldDescriptorProto_Label> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::FieldDescriptorProto_Label>() {
   return ::google::protobuf::FieldDescriptorProto_Label_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::FileOptions_OptimizeMode> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::FileOptions_OptimizeMode> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::FileOptions_OptimizeMode>() {
   return ::google::protobuf::FileOptions_OptimizeMode_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::FieldOptions_CType> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::FieldOptions_CType> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::FieldOptions_CType>() {
   return ::google::protobuf::FieldOptions_CType_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::FieldOptions_JSType> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::FieldOptions_JSType> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::FieldOptions_JSType>() {
   return ::google::protobuf::FieldOptions_JSType_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::MethodOptions_IdempotencyLevel> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::MethodOptions_IdempotencyLevel> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::MethodOptions_IdempotencyLevel>() {
   return ::google::protobuf::MethodOptions_IdempotencyLevel_descriptor();
@@ -8645,8 +11912,7 @@ inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::MethodOption
 
 }  // namespace protobuf
 }  // namespace google
-#endif  // SWIG
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fdescriptor_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fdescriptor_2eproto
diff --git a/src/google/protobuf/descriptor.proto b/src/google/protobuf/descriptor.proto
index e5f83e62..ed08fcbc 100644
--- a/src/google/protobuf/descriptor.proto
+++ b/src/google/protobuf/descriptor.proto
@@ -45,6 +45,7 @@ option java_package = "com.google.protobuf";
 option java_outer_classname = "DescriptorProtos";
 option csharp_namespace = "Google.Protobuf.Reflection";
 option objc_class_prefix = "GPB";
+option cc_enable_arenas = true;
 
 // descriptor.proto must be optimized for speed because reflection-based
 // algorithms don't work during bootstrapping.
@@ -101,6 +102,8 @@ message DescriptorProto {
   message ExtensionRange {
     optional int32 start = 1;
     optional int32 end = 2;
+
+    optional ExtensionRangeOptions options = 3;
   }
   repeated ExtensionRange extension_range = 5;
 
@@ -121,6 +124,14 @@ message DescriptorProto {
   repeated string reserved_name = 10;
 }
 
+message ExtensionRangeOptions {
+  // The parser stores options it doesn't recognize here. See above.
+  repeated UninterpretedOption uninterpreted_option = 999;
+
+  // Clients can define custom options in extensions of this message. See above.
+  extensions 1000 to max;
+}
+
 // Describes a field within a message.
 message FieldDescriptorProto {
   enum Type {
@@ -215,6 +226,26 @@ message EnumDescriptorProto {
   repeated EnumValueDescriptorProto value = 2;
 
   optional EnumOptions options = 3;
+
+  // Range of reserved numeric values. Reserved values may not be used by
+  // entries in the same enum. Reserved ranges may not overlap.
+  //
+  // Note that this is distinct from DescriptorProto.ReservedRange in that it
+  // is inclusive such that it can appropriately represent the entire int32
+  // domain.
+  message EnumReservedRange {
+    optional int32 start = 1; // Inclusive.
+    optional int32 end = 2;   // Inclusive.
+  }
+
+  // Range of reserved numeric values. Reserved numeric values may not be used
+  // by enum values in the same enum declaration. Reserved ranges may not
+  // overlap.
+  repeated EnumReservedRange reserved_range = 4;
+
+  // Reserved enum value names, which may not be reused. A given name may only
+  // be reserved once.
+  repeated string reserved_name = 5;
 }
 
 // Describes a value within an enum.
@@ -351,6 +382,7 @@ message FileOptions {
   optional bool cc_generic_services = 16 [default=false];
   optional bool java_generic_services = 17 [default=false];
   optional bool py_generic_services = 18 [default=false];
+  optional bool php_generic_services = 42 [default=false];
 
   // Is this file deprecated?
   // Depending on the target platform, this can emit Deprecated annotations
@@ -376,10 +408,32 @@ message FileOptions {
   // to prefix the types/symbols defined.
   optional string swift_prefix = 39;
 
-  // The parser stores options it doesn't recognize here. See above.
+  // Sets the php class prefix which is prepended to all php generated classes
+  // from this .proto. Default is empty.
+  optional string php_class_prefix = 40;
+
+  // Use this option to change the namespace of php generated classes. Default
+  // is empty. When this option is empty, the package name will be used for
+  // determining the namespace.
+  optional string php_namespace = 41;
+
+
+  // Use this option to change the namespace of php generated metadata classes.
+  // Default is empty. When this option is empty, the proto file name will be used
+  // for determining the namespace.
+  optional string php_metadata_namespace = 44;
+
+  // Use this option to change the package of ruby generated classes. Default
+  // is empty. When this option is not set, the package name will be used for
+  // determining the ruby package.
+  optional string ruby_package = 45;
+
+  // The parser stores options it doesn't recognize here.
+  // See the documentation for the "Options" section above.
   repeated UninterpretedOption uninterpreted_option = 999;
 
-  // Clients can define custom options in extensions of this message. See above.
+  // Clients can define custom options in extensions of this message.
+  // See the documentation for the "Options" section above.
   extensions 1000 to max;
 
   reserved 38;
@@ -441,7 +495,7 @@ message MessageOptions {
   optional bool map_entry = 7;
 
   reserved 8;  // javalite_serializable
-
+  reserved 9;  // javanano_as_lite
 
   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;
@@ -473,13 +527,15 @@ message FieldOptions {
 
   // The jstype option determines the JavaScript type used for values of the
   // field.  The option is permitted only for 64 bit integral and fixed types
-  // (int64, uint64, sint64, fixed64, sfixed64).  By default these types are
-  // represented as JavaScript strings.  This avoids loss of precision that can
-  // happen when a large value is converted to a floating point JavaScript
-  // numbers.  Specifying JS_NUMBER for the jstype causes the generated
-  // JavaScript code to use the JavaScript "number" type instead of strings.
-  // This option is an enum to permit additional types to be added,
-  // e.g. goog.math.Integer.
+  // (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+  // is represented as JavaScript string, which avoids loss of precision that
+  // can happen when a large value is converted to a floating point JavaScript.
+  // Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+  // use the JavaScript "number" type.  The behavior of the default option
+  // JS_NORMAL is implementation dependent.
+  //
+  // This option is an enum to permit additional types to be added, e.g.
+  // goog.math.Integer.
   optional JSType jstype = 6 [default = JS_NORMAL];
   enum JSType {
     // Use the default type.
@@ -561,6 +617,7 @@ message EnumOptions {
   // is a formalization for deprecating enums.
   optional bool deprecated = 3 [default=false];
 
+  reserved 5;  // javanano_as_lite
 
   // The parser stores options it doesn't recognize here. See above.
   repeated UninterpretedOption uninterpreted_option = 999;
diff --git a/src/google/protobuf/descriptor_database.cc b/src/google/protobuf/descriptor_database.cc
index 57ae960f..ba85ef13 100644
--- a/src/google/protobuf/descriptor_database.cc
+++ b/src/google/protobuf/descriptor_database.cc
@@ -39,8 +39,9 @@
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/stubs/strutil.h>
-#include <google/protobuf/stubs/stl_util.h>
+
 #include <google/protobuf/stubs/map_util.h>
+#include <google/protobuf/stubs/stl_util.h>
 
 namespace google {
 namespace protobuf {
@@ -199,7 +200,7 @@ template <typename Value>
 bool SimpleDescriptorDatabase::DescriptorIndex<Value>::FindAllExtensionNumbers(
     const string& containing_type,
     std::vector<int>* output) {
-  typename std::map<pair<string, int>, Value>::const_iterator it =
+  typename std::map<std::pair<string, int>, Value>::const_iterator it =
       by_extension_.lower_bound(std::make_pair(containing_type, 0));
   bool success = false;
 
@@ -213,7 +214,7 @@ bool SimpleDescriptorDatabase::DescriptorIndex<Value>::FindAllExtensionNumbers(
 }
 
 template <typename Value>
-typename map<string, Value>::iterator
+typename std::map<string, Value>::iterator
 SimpleDescriptorDatabase::DescriptorIndex<Value>::FindLastLessOrEqual(
     const string& name) {
   // Find the last key in the map which sorts less than or equal to the
@@ -230,7 +231,7 @@ bool SimpleDescriptorDatabase::DescriptorIndex<Value>::IsSubSymbol(
     const string& sub_symbol, const string& super_symbol) {
   return sub_symbol == super_symbol ||
          (HasPrefixString(super_symbol, sub_symbol) &&
-             super_symbol[sub_symbol.size()] == '.');
+          super_symbol[sub_symbol.size()] == '.');
 }
 
 template <typename Value>
diff --git a/src/google/protobuf/descriptor_database.h b/src/google/protobuf/descriptor_database.h
index be97a6d8..d61f2a6a 100644
--- a/src/google/protobuf/descriptor_database.h
+++ b/src/google/protobuf/descriptor_database.h
@@ -102,6 +102,18 @@ class LIBPROTOBUF_EXPORT DescriptorDatabase {
   }
 
 
+  // Finds the file names and appends them to the output in an
+  // undefined order. This method is best-effort: it's not guaranteed that the
+  // database will find all files. Returns true if the database supports
+  // searching all file names, otherwise returns false and leaves output
+  // unchanged.
+  //
+  // This method has a default implementation that always returns
+  // false.
+  virtual bool FindAllFileNames(std::vector<string>* output) {
+    return false;
+  }
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DescriptorDatabase);
 };
@@ -202,7 +214,7 @@ class LIBPROTOBUF_EXPORT SimpleDescriptorDatabase : public DescriptorDatabase {
     // will find it.  Proof:
     // 1) Define the "search key" to be the key we are looking for, the "found
     //    key" to be the key found in step (1), and the "match key" to be the
-    //    key which actually matches the serach key (i.e. the key we're trying
+    //    key which actually matches the search key (i.e. the key we're trying
     //    to find).
     // 2) The found key must be less than or equal to the search key by
     //    definition.
diff --git a/src/google/protobuf/descriptor_database_unittest.cc b/src/google/protobuf/descriptor_database_unittest.cc
index 05d67656..083ef8f2 100644
--- a/src/google/protobuf/descriptor_database_unittest.cc
+++ b/src/google/protobuf/descriptor_database_unittest.cc
@@ -36,15 +36,11 @@
 
 #include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
-#include <google/protobuf/descriptor_database.h>
-#include <google/protobuf/descriptor.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/descriptor_database.h>
 #include <google/protobuf/text_format.h>
-#include <google/protobuf/stubs/strutil.h>
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -180,7 +176,7 @@ class DescriptorDatabaseTest
     EXPECT_FALSE(test_case_->AddToDatabase(file_proto));
   }
 
-  google::protobuf::scoped_ptr<DescriptorDatabaseTestCase> test_case_;
+  std::unique_ptr<DescriptorDatabaseTestCase> test_case_;
   DescriptorDatabase* database_;
 };
 
@@ -248,6 +244,10 @@ TEST_P(DescriptorDatabaseTest, FindFileContainingSymbol) {
     FileDescriptorProto file;
     EXPECT_TRUE(database_->FindFileContainingSymbol("Foo.qux", &file));
     EXPECT_EQ("foo.proto", file.name());
+    // Non-existent field under a valid top level symbol can also be
+    // found.
+    EXPECT_TRUE(database_->FindFileContainingSymbol("Foo.none_field.none",
+                                                    &file));
   }
 
   {
diff --git a/src/google/protobuf/descriptor_unittest.cc b/src/google/protobuf/descriptor_unittest.cc
index 7ec75156..54da095a 100644
--- a/src/google/protobuf/descriptor_unittest.cc
+++ b/src/google/protobuf/descriptor_unittest.cc
@@ -34,16 +34,15 @@
 //
 // This file makes extensive use of RFC 3092.  :)
 
+#include <limits>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/compiler/importer.h>
 #include <google/protobuf/compiler/parser.h>
 #include <google/protobuf/unittest.pb.h>
 #include <google/protobuf/unittest_custom_options.pb.h>
+#include <google/protobuf/unittest_lazy_dependencies.pb.h>
 #include <google/protobuf/unittest_proto3_arena.pb.h>
 #include <google/protobuf/io/tokenizer.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
@@ -52,7 +51,6 @@
 #include <google/protobuf/descriptor_database.h>
 #include <google/protobuf/dynamic_message.h>
 #include <google/protobuf/text_format.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 
 #include <google/protobuf/stubs/common.h>
@@ -62,6 +60,7 @@
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 
+
 namespace google {
 namespace protobuf {
 
@@ -157,6 +156,14 @@ DescriptorProto::ReservedRange* AddReservedRange(DescriptorProto* parent,
   return result;
 }
 
+EnumDescriptorProto::EnumReservedRange* AddReservedRange(
+    EnumDescriptorProto* parent, int start, int end) {
+  EnumDescriptorProto::EnumReservedRange* result = parent->add_reserved_range();
+  result->set_start(start);
+  result->set_end(end);
+  return result;
+}
+
 EnumValueDescriptorProto* AddEnumValue(EnumDescriptorProto* enum_proto,
                                        const string& name, int number) {
   EnumValueDescriptorProto* result = enum_proto->add_value();
@@ -421,6 +428,7 @@ TEST_F(FileDescriptorTest, FindExtensionByNumber) {
   EXPECT_TRUE(pool_.FindExtensionByNumber(foo_message_, 2) == NULL);
 }
 
+
 TEST_F(FileDescriptorTest, BuildAgain) {
   // Test that if te call BuildFile again on the same input we get the same
   // FileDescriptor back.
@@ -501,7 +509,7 @@ void ExtractDebugString(
   for (int i = 0; i < file->dependency_count(); ++i) {
     ExtractDebugString(file->dependency(i), visited, debug_strings);
   }
-  debug_strings->push_back(make_pair(file->name(), file->DebugString()));
+  debug_strings->push_back(std::make_pair(file->name(), file->DebugString()));
 }
 
 class SimpleErrorCollector : public google::protobuf::io::ErrorCollector {
@@ -963,6 +971,7 @@ TEST_F(DescriptorTest, FieldEnumType) {
   EXPECT_EQ(enum_, bar_->enum_type());
 }
 
+
 // ===================================================================
 
 // Test simple flat messages and fields.
@@ -1933,6 +1942,7 @@ TEST_F(ExtensionDescriptorTest, FindAllExtensions) {
   EXPECT_EQ(39, extensions[3]->number());
 }
 
+
 TEST_F(ExtensionDescriptorTest, DuplicateFieldNumber) {
   DescriptorPool pool;
   FileDescriptorProto file_proto;
@@ -2047,6 +2057,137 @@ TEST_F(ReservedDescriptorTest, IsReservedName) {
 
 // ===================================================================
 
+// Test reserved enum fields.
+class ReservedEnumDescriptorTest : public testing::Test {
+ protected:
+  virtual void SetUp() {
+    // Build descriptors for the following definitions:
+    //
+    //   enum Foo {
+    //     BAR = 1;
+    //     reserved 2, 9 to 11, 15;
+    //     reserved "foo", "bar";
+    //   }
+
+    FileDescriptorProto foo_file;
+    foo_file.set_name("foo.proto");
+
+    EnumDescriptorProto* foo = AddEnum(&foo_file, "Foo");
+    EnumDescriptorProto* edge1 = AddEnum(&foo_file, "Edge1");
+    EnumDescriptorProto* edge2 = AddEnum(&foo_file, "Edge2");
+
+    AddEnumValue(foo, "BAR", 4);
+    AddReservedRange(foo, -5, -3);
+    AddReservedRange(foo, -2, 1);
+    AddReservedRange(foo, 2, 3);
+    AddReservedRange(foo, 9, 12);
+    AddReservedRange(foo, 15, 16);
+
+    foo->add_reserved_name("foo");
+    foo->add_reserved_name("bar");
+
+    // Some additional edge cases that cover most or all of the range of enum
+    // values
+
+    // Note: We use INT_MAX as the maximum reserved range upper bound,
+    // inclusive.
+    AddEnumValue(edge1, "EDGE1", 1);
+    AddReservedRange(edge1, 10, INT_MAX);
+    AddEnumValue(edge2, "EDGE2", 15);
+    AddReservedRange(edge2, INT_MIN, 10);
+
+    // Build the descriptors and get the pointers.
+    foo_file_ = pool_.BuildFile(foo_file);
+    ASSERT_TRUE(foo_file_ != NULL);
+
+    ASSERT_EQ(3, foo_file_->enum_type_count());
+    foo_ = foo_file_->enum_type(0);
+    edge1_ = foo_file_->enum_type(1);
+    edge2_ = foo_file_->enum_type(2);
+  }
+
+  DescriptorPool pool_;
+  const FileDescriptor* foo_file_;
+  const EnumDescriptor* foo_;
+  const EnumDescriptor* edge1_;
+  const EnumDescriptor* edge2_;
+};
+
+TEST_F(ReservedEnumDescriptorTest, ReservedRanges) {
+  ASSERT_EQ(5, foo_->reserved_range_count());
+
+  EXPECT_EQ(-5, foo_->reserved_range(0)->start);
+  EXPECT_EQ(-3, foo_->reserved_range(0)->end);
+
+  EXPECT_EQ(-2, foo_->reserved_range(1)->start);
+  EXPECT_EQ(1, foo_->reserved_range(1)->end);
+
+  EXPECT_EQ(2, foo_->reserved_range(2)->start);
+  EXPECT_EQ(3, foo_->reserved_range(2)->end);
+
+  EXPECT_EQ(9, foo_->reserved_range(3)->start);
+  EXPECT_EQ(12, foo_->reserved_range(3)->end);
+
+  EXPECT_EQ(15, foo_->reserved_range(4)->start);
+  EXPECT_EQ(16, foo_->reserved_range(4)->end);
+
+  ASSERT_EQ(1, edge1_->reserved_range_count());
+  EXPECT_EQ(10, edge1_->reserved_range(0)->start);
+  EXPECT_EQ(INT_MAX, edge1_->reserved_range(0)->end);
+
+  ASSERT_EQ(1, edge2_->reserved_range_count());
+  EXPECT_EQ(INT_MIN, edge2_->reserved_range(0)->start);
+  EXPECT_EQ(10, edge2_->reserved_range(0)->end);
+}
+
+TEST_F(ReservedEnumDescriptorTest, IsReservedNumber) {
+  EXPECT_TRUE(foo_->IsReservedNumber(-5));
+  EXPECT_TRUE(foo_->IsReservedNumber(-4));
+  EXPECT_TRUE(foo_->IsReservedNumber(-3));
+  EXPECT_TRUE(foo_->IsReservedNumber(-2));
+  EXPECT_TRUE(foo_->IsReservedNumber(-1));
+  EXPECT_TRUE(foo_->IsReservedNumber(0));
+  EXPECT_TRUE(foo_->IsReservedNumber(1));
+  EXPECT_TRUE (foo_->IsReservedNumber(2));
+  EXPECT_TRUE(foo_->IsReservedNumber(3));
+  EXPECT_FALSE(foo_->IsReservedNumber(8));
+  EXPECT_TRUE (foo_->IsReservedNumber(9));
+  EXPECT_TRUE (foo_->IsReservedNumber(10));
+  EXPECT_TRUE (foo_->IsReservedNumber(11));
+  EXPECT_TRUE(foo_->IsReservedNumber(12));
+  EXPECT_FALSE(foo_->IsReservedNumber(13));
+  EXPECT_FALSE(foo_->IsReservedNumber(13));
+  EXPECT_FALSE(foo_->IsReservedNumber(14));
+  EXPECT_TRUE (foo_->IsReservedNumber(15));
+  EXPECT_TRUE(foo_->IsReservedNumber(16));
+  EXPECT_FALSE(foo_->IsReservedNumber(17));
+
+  EXPECT_FALSE(edge1_->IsReservedNumber(9));
+  EXPECT_TRUE(edge1_->IsReservedNumber(10));
+  EXPECT_TRUE(edge1_->IsReservedNumber(INT_MAX - 1));
+  EXPECT_TRUE(edge1_->IsReservedNumber(INT_MAX));
+
+  EXPECT_TRUE(edge2_->IsReservedNumber(INT_MIN));
+  EXPECT_TRUE(edge2_->IsReservedNumber(9));
+  EXPECT_TRUE(edge2_->IsReservedNumber(10));
+  EXPECT_FALSE(edge2_->IsReservedNumber(11));
+}
+
+TEST_F(ReservedEnumDescriptorTest, ReservedNames) {
+  ASSERT_EQ(2, foo_->reserved_name_count());
+
+  EXPECT_EQ("foo", foo_->reserved_name(0));
+  EXPECT_EQ("bar", foo_->reserved_name(1));
+}
+
+TEST_F(ReservedEnumDescriptorTest, IsReservedName) {
+  EXPECT_TRUE (foo_->IsReservedName("foo"));
+  EXPECT_TRUE (foo_->IsReservedName("bar"));
+  EXPECT_FALSE(foo_->IsReservedName("baz"));
+}
+
+// ===================================================================
+
 class MiscTest : public testing::Test {
  protected:
   // Function which makes a field descriptor of the given type.
@@ -2108,7 +2249,7 @@ class MiscTest : public testing::Test {
     return field != NULL ? field->enum_type() : NULL;
   }
 
-  google::protobuf::scoped_ptr<DescriptorPool> pool_;
+  std::unique_ptr<DescriptorPool> pool_;
 };
 
 TEST_F(MiscTest, TypeNames) {
@@ -2538,7 +2679,7 @@ class AllowUnknownDependenciesTest
   const FieldDescriptor* qux_field_;
 
   SimpleDescriptorDatabase db_;        // used if in FALLBACK_DATABASE mode.
-  google::protobuf::scoped_ptr<DescriptorPool> pool_;
+  std::unique_ptr<DescriptorPool> pool_;
 };
 
 TEST_P(AllowUnknownDependenciesTest, PlaceholderFile) {
@@ -3774,6 +3915,166 @@ TEST_F(ValidationErrorTest, ReservedFieldsDebugString) {
     file->DebugString());
 }
 
+TEST_F(ValidationErrorTest, EnumReservedFieldError) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:15 }"
+    "  reserved_range { start: 10 end: 20 }"
+    "}",
+
+    "foo.proto: BAR: NUMBER: Enum value \"BAR\" uses reserved number 15.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumNegativeReservedFieldError) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:-15 }"
+    "  reserved_range { start: -20 end: -10 }"
+    "}",
+
+    "foo.proto: BAR: NUMBER: Enum value \"BAR\" uses reserved number -15.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedRangeOverlap) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:0 }"
+    "  reserved_range { start: 10 end: 20 }"
+    "  reserved_range { start: 5 end: 15 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range 5 to 15"
+    " overlaps with already-defined range 10 to 20.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedRangeOverlapByOne) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:0 }"
+    "  reserved_range { start: 10 end: 20 }"
+    "  reserved_range { start: 5 end: 10 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range 5 to 10"
+    " overlaps with already-defined range 10 to 20.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumNegativeReservedRangeOverlap) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:0 }"
+    "  reserved_range { start: -20 end: -10 }"
+    "  reserved_range { start: -15 end: -5 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range -15 to -5"
+    " overlaps with already-defined range -20 to -10.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumMixedReservedRangeOverlap) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:20 }"
+    "  reserved_range { start: -20 end: 10 }"
+    "  reserved_range { start: -15 end: 5 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range -15 to 5"
+    " overlaps with already-defined range -20 to 10.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumMixedReservedRangeOverlap2) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:20 }"
+    "  reserved_range { start: -20 end: 10 }"
+    "  reserved_range { start: 10 end: 10 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range 10 to 10"
+    " overlaps with already-defined range -20 to 10.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedRangeStartGreaterThanEnd) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"BAR\" number:20 }"
+    "  reserved_range { start: 11 end: 10 }"
+    "}",
+
+    "foo.proto: Foo: NUMBER: Reserved range end number must be greater"
+    " than start number.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedNameError) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"FOO\" number:15 }"
+    "  value { name:\"BAR\" number:15 }"
+    "  reserved_name: \"FOO\""
+    "  reserved_name: \"BAR\""
+    "}",
+
+    "foo.proto: FOO: NAME: Enum value \"FOO\" is reserved.\n"
+    "foo.proto: BAR: NAME: Enum value \"BAR\" is reserved.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedNameRedundant) {
+  BuildFileWithErrors(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"FOO\" number:15 }"
+    "  reserved_name: \"foo\""
+    "  reserved_name: \"foo\""
+    "}",
+
+    "foo.proto: foo: NAME: Enum value \"foo\" is reserved multiple times.\n");
+}
+
+TEST_F(ValidationErrorTest, EnumReservedFieldsDebugString) {
+  const FileDescriptor* file = BuildFile(
+    "name: \"foo.proto\" "
+    "enum_type {"
+    "  name: \"Foo\""
+    "  value { name:\"FOO\" number:3 }"
+    "  reserved_name: \"foo\""
+    "  reserved_name: \"bar\""
+    "  reserved_range { start: -6 end: -6 }"
+    "  reserved_range { start: -5 end: -4 }"
+    "  reserved_range { start: -1 end: 1 }"
+    "  reserved_range { start: 5 end: 5 }"
+    "  reserved_range { start: 10 end: 19 }"
+    "}");
+
+  ASSERT_EQ(
+    "syntax = \"proto2\";\n\n"
+    "enum Foo {\n"
+    "  FOO = 3;\n"
+    "  reserved -6, -5 to -4, -1 to 1, 5, 10 to 19;\n"
+    "  reserved \"foo\", \"bar\";\n"
+    "}\n\n",
+    file->DebugString());
+}
+
 TEST_F(ValidationErrorTest, InvalidDefaults) {
   BuildFileWithErrors(
     "name: \"foo.proto\" "
@@ -6066,6 +6367,7 @@ TEST_F(ValidationErrorTest, ValidateProto3JsonName) {
       "conflicts with field \"ab\". This is not allowed in proto3.\n");
 }
 
+
 // ===================================================================
 // DescriptorDatabase
 
@@ -6616,40 +6918,95 @@ class SingletonSourceTree : public compiler::SourceTree {
 
 const char *const kSourceLocationTestInput =
   "syntax = \"proto2\";\n"
+  "option java_package = \"com.foo.bar\";\n"
+  "option (test_file_opt) = \"foobar\";\n"
   "message A {\n"
-  "  optional int32 a = 1;\n"
+  "  option (test_msg_opt) = \"foobar\";\n"
+  "  optional int32 a = 1 [deprecated = true];\n"
   "  message B {\n"
-  "    required double b = 1;\n"
+  "    required double b = 1 [(test_field_opt) = \"foobar\"];\n"
+  "  }\n"
+  "  oneof c {\n"
+  "    option (test_oneof_opt) = \"foobar\";\n"
+  "    string d = 2;\n"
+  "    string e = 3;\n"
+  "    string f = 4;\n"
   "  }\n"
   "}\n"
   "enum Indecision {\n"
-  "  YES   = 1;\n"
-  "  NO    = 2;\n"
+  "  option (test_enum_opt) = 21;\n"
+  "  option (test_enum_opt) = 42;\n"
+  "  option (test_enum_opt) = 63;\n"
+  "  YES   = 1 [(test_enumval_opt).a = 100];\n"
+  "  NO    = 2 [(test_enumval_opt) = {a:200}];\n"
   "  MAYBE = 3;\n"
   "}\n"
   "service S {\n"
+  "  option (test_svc_opt) = {a:100};\n"
+  "  option (test_svc_opt) = {a:200};\n"
+  "  option (test_svc_opt) = {a:300};\n"
   "  rpc Method(A) returns (A.B);\n"
   // Put an empty line here to make the source location range match.
   "\n"
+  "  rpc OtherMethod(A) returns (A) {\n"
+  "    option deprecated = true;\n"
+  "    option (test_method_opt) = \"foobar\";\n"
+  "  }\n"
   "}\n"
   "message MessageWithExtensions {\n"
-  "  extensions 1000 to max;\n"
+  "  extensions 1000 to 2000, 2001 to max [(test_ext_opt) = \"foobar\"];\n"
   "}\n"
   "extend MessageWithExtensions {\n"
-  "  optional int32 int32_extension = 1001;\n"
+  "  repeated int32 int32_extension = 1001 [packed=true];\n"
   "}\n"
   "message C {\n"
   "  extend MessageWithExtensions {\n"
   "    optional C message_extension = 1002;\n"
   "  }\n"
-  "}\n";
+  "}\n"
+  "import \"google/protobuf/descriptor.proto\";\n"
+  "extend google.protobuf.FileOptions {\n"
+  "  optional string test_file_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.MessageOptions {\n"
+  "  optional string test_msg_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.FieldOptions {\n"
+  "  optional string test_field_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.EnumOptions {\n"
+  "  repeated int32 test_enum_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.EnumValueOptions {\n"
+  "  optional A test_enumval_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.ServiceOptions {\n"
+  "  repeated A test_svc_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.MethodOptions {\n"
+  "  optional string test_method_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.OneofOptions {\n"
+  "  optional string test_oneof_opt = 10101;\n"
+  "}\n"
+  "extend google.protobuf.ExtensionRangeOptions {\n"
+  "  optional string test_ext_opt = 10101;\n"
+  "}\n"
+  ;
 
 class SourceLocationTest : public testing::Test {
  public:
   SourceLocationTest()
       : source_tree_("/test/test.proto", kSourceLocationTestInput),
-        db_(&source_tree_),
-        pool_(&db_, &collector_) {}
+        simple_db_(),
+        source_tree_db_(&source_tree_),
+        merged_db_(&simple_db_, &source_tree_db_),
+        pool_(&merged_db_, &collector_) {
+    // we need descriptor.proto to be accessible by the pool
+    // since our test file imports it
+    FileDescriptorProto::descriptor()->file()->CopyTo(&file_proto_);
+    simple_db_.Add(file_proto_);
+  }
 
   static string PrintSourceLocation(const SourceLocation &loc) {
     return strings::Substitute("$0:$1-$2:$3",
@@ -6660,12 +7017,20 @@ class SourceLocationTest : public testing::Test {
   }
 
  private:
+  FileDescriptorProto file_proto_;
   AbortingErrorCollector collector_;
   SingletonSourceTree source_tree_;
-  compiler::SourceTreeDescriptorDatabase db_;
+  SimpleDescriptorDatabase simple_db_; // contains descriptor.proto
+  compiler::SourceTreeDescriptorDatabase source_tree_db_; // loads test.proto
+  MergedDescriptorDatabase merged_db_; // combines above two dbs
 
  protected:
   DescriptorPool pool_;
+
+  // tag number of all custom options in above test file
+  static const int kCustomOptionFieldNumber = 10101;
+  // tag number of field "a" in message type "A" in above test file
+  static const int kA_aFieldNumber = 1;
 };
 
 // TODO(adonovan): implement support for option fields and for
@@ -6679,27 +7044,27 @@ TEST_F(SourceLocationTest, GetSourceLocation) {
 
   const Descriptor *a_desc = file_desc->FindMessageTypeByName("A");
   EXPECT_TRUE(a_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("2:1-7:2", PrintSourceLocation(loc));
+  EXPECT_EQ("4:1-16:2", PrintSourceLocation(loc));
 
   const Descriptor *a_b_desc = a_desc->FindNestedTypeByName("B");
   EXPECT_TRUE(a_b_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("4:3-6:4", PrintSourceLocation(loc));
+  EXPECT_EQ("7:3-9:4", PrintSourceLocation(loc));
 
   const EnumDescriptor *e_desc = file_desc->FindEnumTypeByName("Indecision");
   EXPECT_TRUE(e_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("8:1-12:2", PrintSourceLocation(loc));
+  EXPECT_EQ("17:1-24:2", PrintSourceLocation(loc));
 
   const EnumValueDescriptor *yes_desc = e_desc->FindValueByName("YES");
   EXPECT_TRUE(yes_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("9:3-9:13", PrintSourceLocation(loc));
+  EXPECT_EQ("21:3-21:42", PrintSourceLocation(loc));
 
   const ServiceDescriptor *s_desc = file_desc->FindServiceByName("S");
   EXPECT_TRUE(s_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("13:1-16:2", PrintSourceLocation(loc));
+  EXPECT_EQ("25:1-35:2", PrintSourceLocation(loc));
 
   const MethodDescriptor *m_desc = s_desc->FindMethodByName("Method");
   EXPECT_TRUE(m_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("14:3-14:31", PrintSourceLocation(loc));
+  EXPECT_EQ("29:3-29:31", PrintSourceLocation(loc));
 
 }
 
@@ -6712,16 +7077,426 @@ TEST_F(SourceLocationTest, ExtensionSourceLocation) {
   const FieldDescriptor *int32_extension_desc =
       file_desc->FindExtensionByName("int32_extension");
   EXPECT_TRUE(int32_extension_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("21:3-21:41", PrintSourceLocation(loc));
+  EXPECT_EQ("40:3-40:55", PrintSourceLocation(loc));
 
   const Descriptor *c_desc = file_desc->FindMessageTypeByName("C");
   EXPECT_TRUE(c_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("23:1-27:2", PrintSourceLocation(loc));
+  EXPECT_EQ("42:1-46:2", PrintSourceLocation(loc));
 
   const FieldDescriptor *message_extension_desc =
       c_desc->FindExtensionByName("message_extension");
   EXPECT_TRUE(message_extension_desc->GetSourceLocation(&loc));
-  EXPECT_EQ("25:5-25:41", PrintSourceLocation(loc));
+  EXPECT_EQ("44:5-44:41", PrintSourceLocation(loc));
+}
+
+TEST_F(SourceLocationTest, InterpretedOptionSourceLocation) {
+  // This one's a doozy. It checks every kind of option, including
+  // extension range options.
+
+  // We are verifying that the file's source info contains correct
+  // info for interpreted options and that it does *not* contain
+  // any info for corresponding uninterpreted option path.
+
+  SourceLocation loc;
+
+  const FileDescriptor *file_desc =
+      GOOGLE_CHECK_NOTNULL(pool_.FindFileByName("/test/test.proto"));
+
+  // File options
+  {
+    int path[]  = {FileDescriptorProto::kOptionsFieldNumber,
+                   FileOptions::kJavaPackageFieldNumber};
+    int unint[] = {FileDescriptorProto::kOptionsFieldNumber,
+                   FileOptions::kUninterpretedOptionFieldNumber,
+                   0};
+
+    std::vector<int> vpath(path, path + 2);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("2:1-2:37", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 3);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kOptionsFieldNumber,
+                   FileOptions::kUninterpretedOptionFieldNumber,
+                   1};
+    std::vector<int> vpath(path, path + 2);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("3:1-3:35", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 3);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Message option
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kOptionsFieldNumber,
+                   MessageOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 4);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("5:3-5:36", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Field option
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kFieldFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   FieldOptions::kDeprecatedFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kFieldFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   FieldOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("6:25-6:42", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Nested message option
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kNestedTypeFieldNumber,
+                   0,
+                   DescriptorProto::kFieldFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kNestedTypeFieldNumber,
+                   0,
+                   DescriptorProto::kFieldFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   FieldOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 8);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("8:28-8:55", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 9);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // One-of option
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kOneofDeclFieldNumber,
+                   0,
+                   OneofDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   0,
+                   DescriptorProto::kOneofDeclFieldNumber,
+                   0,
+                   OneofDescriptorProto::kOptionsFieldNumber,
+                   OneofOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("11:5-11:40", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Enum option, repeated options
+  {
+    int path[]  = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   0};
+    int unint[] = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   EnumOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("18:3-18:31", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   1};
+    int unint[] = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   EnumOptions::kUninterpretedOptionFieldNumber,
+                   1};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("19:3-19:31", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   2};
+    int unint[] = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kOptionsFieldNumber,
+                   OneofOptions::kUninterpretedOptionFieldNumber,
+                   2};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("20:3-20:31", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Enum value options
+  {
+    // option w/ message type that directly sets field
+    int path[]  = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kValueFieldNumber,
+                   0,
+                   EnumValueDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   kA_aFieldNumber};
+    int unint[] = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kValueFieldNumber,
+                   0,
+                   EnumValueDescriptorProto::kOptionsFieldNumber,
+                   EnumValueOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 7);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("21:14-21:40", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kValueFieldNumber,
+                   1,
+                   EnumValueDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kEnumTypeFieldNumber,
+                   0,
+                   EnumDescriptorProto::kValueFieldNumber,
+                   1,
+                   EnumValueDescriptorProto::kOptionsFieldNumber,
+                   EnumValueOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("22:14-22:42", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Service option, repeated options
+  {
+    int path[]  = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   0};
+    int unint[] = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   ServiceOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("26:3-26:35", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   1};
+    int unint[] = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   ServiceOptions::kUninterpretedOptionFieldNumber,
+                   1};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("27:3-27:35", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber,
+                   2};
+    int unint[] = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kOptionsFieldNumber,
+                   ServiceOptions::kUninterpretedOptionFieldNumber,
+                   2};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("28:3-28:35", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Method options
+  {
+    int path[]  = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kMethodFieldNumber,
+                   1,
+                   MethodDescriptorProto::kOptionsFieldNumber,
+                   MethodOptions::kDeprecatedFieldNumber};
+    int unint[] = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kMethodFieldNumber,
+                   1,
+                   MethodDescriptorProto::kOptionsFieldNumber,
+                   MethodOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("32:5-32:30", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kMethodFieldNumber,
+                   1,
+                   MethodDescriptorProto::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kServiceFieldNumber,
+                   0,
+                   ServiceDescriptorProto::kMethodFieldNumber,
+                   1,
+                   MethodDescriptorProto::kOptionsFieldNumber,
+                   MethodOptions::kUninterpretedOptionFieldNumber,
+                   1};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("33:5-33:41", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Extension range options
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   1,
+                   DescriptorProto::kExtensionRangeFieldNumber,
+                   0,
+                   DescriptorProto_ExtensionRange::kOptionsFieldNumber};
+    std::vector<int> vpath(path, path + 5);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("37:40-37:67", PrintSourceLocation(loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   1,
+                   DescriptorProto::kExtensionRangeFieldNumber,
+                   0,
+                   DescriptorProto_ExtensionRange::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   1,
+                   DescriptorProto::kExtensionRangeFieldNumber,
+                   0,
+                   DescriptorProto_ExtensionRange::kOptionsFieldNumber,
+                   ExtensionRangeOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("37:41-37:66", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+  {
+    int path[]  = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   1,
+                   DescriptorProto::kExtensionRangeFieldNumber,
+                   1,
+                   DescriptorProto_ExtensionRange::kOptionsFieldNumber,
+                   kCustomOptionFieldNumber};
+    int unint[] = {FileDescriptorProto::kMessageTypeFieldNumber,
+                   1,
+                   DescriptorProto::kExtensionRangeFieldNumber,
+                   1,
+                   DescriptorProto_ExtensionRange::kOptionsFieldNumber,
+                   ExtensionRangeOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 6);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("37:41-37:66", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 7);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
+
+  // Field option on extension
+  {
+    int path[]  = {FileDescriptorProto::kExtensionFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   FieldOptions::kPackedFieldNumber};
+    int unint[] = {FileDescriptorProto::kExtensionFieldNumber,
+                   0,
+                   FieldDescriptorProto::kOptionsFieldNumber,
+                   FieldOptions::kUninterpretedOptionFieldNumber,
+                   0};
+    std::vector<int> vpath(path, path + 4);
+    EXPECT_TRUE(file_desc->GetSourceLocation(vpath, &loc));
+    EXPECT_EQ("40:42-40:53", PrintSourceLocation(loc));
+
+    std::vector<int> vunint(unint, unint + 5);
+    EXPECT_FALSE(file_desc->GetSourceLocation(vunint, &loc));
+  }
 }
 
 // Missing SourceCodeInfo doesn't cause crash:
@@ -6824,6 +7599,360 @@ TEST_F(CopySourceCodeInfoToTest, CopySourceCodeInfoTo) {
 
 // ===================================================================
 
+class LazilyBuildDependenciesTest : public testing::Test {
+ public:
+  LazilyBuildDependenciesTest() : pool_(&db_, NULL) {
+    pool_.InternalSetLazilyBuildDependencies();
+  }
+
+  void ParseProtoAndAddToDb(const char* proto) {
+    FileDescriptorProto tmp;
+    ASSERT_TRUE(TextFormat::ParseFromString(proto, &tmp));
+    db_.Add(tmp);
+  }
+
+  void ParseProtoAndAddToDb(const string& proto) {
+    FileDescriptorProto tmp;
+    ASSERT_TRUE(TextFormat::ParseFromString(proto, &tmp));
+    db_.Add(tmp);
+  }
+
+  void AddSimpleMessageProtoFileToDb(const char* file_name,
+                                     const char* message_name) {
+    ParseProtoAndAddToDb("name: '" + string(file_name) +
+                         ".proto' "
+                         "package: \"protobuf_unittest\" "
+                         "message_type { "
+                         "  name:'" +
+                         string(message_name) +
+                         "' "
+                         "  field { name:'a' number:1 "
+                         "  label:LABEL_OPTIONAL "
+                         "  type_name:'int32' } "
+                         "}");
+  }
+
+  void AddSimpleEnumProtoFileToDb(const char* file_name, const char* enum_name,
+                                  const char* enum_value_name) {
+    ParseProtoAndAddToDb("name: '" + string(file_name) +
+                         ".proto' "
+                         "package: 'protobuf_unittest' "
+                         "enum_type { "
+                         "  name:'" +
+                         string(enum_name) +
+                         "' "
+                         "  value { name:'" +
+                         string(enum_value_name) +
+                         "' number:1 } "
+                         "}");
+  }
+
+ protected:
+  SimpleDescriptorDatabase db_;
+  DescriptorPool pool_;
+};
+
+TEST_F(LazilyBuildDependenciesTest, Message) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'bar.proto' "
+      "message_type { "
+      "  name:'Foo' "
+      "  field { name:'bar' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Bar' } "
+      "}");
+  AddSimpleMessageProtoFileToDb("bar", "Bar");
+
+  // Verify neither has been built yet.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("foo.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("bar.proto"));
+
+  const FileDescriptor* file = pool_.FindFileByName("foo.proto");
+
+  // Verify only foo gets built when asking for foo.proto
+  EXPECT_TRUE(file != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("foo.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("bar.proto"));
+
+  // Verify calling FindFieldBy* works when the type of the field was
+  // not built at cross link time. Verify this doesn't build the file
+  // the field's type is defined in, as well.
+  const Descriptor* desc = file->FindMessageTypeByName("Foo");
+  const FieldDescriptor* field = desc->FindFieldByName("bar");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_EQ(field, desc->FindFieldByNumber(1));
+  EXPECT_EQ(field, desc->FindFieldByLowercaseName("bar"));
+  EXPECT_EQ(field, desc->FindFieldByCamelcaseName("bar"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("bar.proto"));
+
+  // Finally, verify that if we call message_type() on the field, we will
+  // buid the file where the message is defined, and get a valid descriptor
+  EXPECT_TRUE(field->message_type() != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("bar.proto"));
+}
+
+TEST_F(LazilyBuildDependenciesTest, Enum) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'enum1.proto' "
+      "dependency: 'enum2.proto' "
+      "message_type { "
+      "  name:'Lazy' "
+      "  field { name:'enum1' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Enum1' } "
+      "  field { name:'enum2' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Enum2' } "
+      "}");
+  AddSimpleEnumProtoFileToDb("enum1", "Enum1", "ENUM1");
+  AddSimpleEnumProtoFileToDb("enum2", "Enum2", "ENUM2");
+
+  const FileDescriptor* file = pool_.FindFileByName("foo.proto");
+
+  // Verify calling enum_type() on a field whose definition is not
+  // yet built will build the file and return a descriptor.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("enum1.proto"));
+  const Descriptor* desc = file->FindMessageTypeByName("Lazy");
+  EXPECT_TRUE(desc != NULL);
+  const FieldDescriptor* field = desc->FindFieldByName("enum1");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_TRUE(field->enum_type() != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("enum1.proto"));
+
+  // Verify calling default_value_enum() on a field whose definition is not
+  // yet built will build the file and return a descriptor to the value.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("enum2.proto"));
+  field = desc->FindFieldByName("enum2");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_TRUE(field->default_value_enum() != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("enum2.proto"));
+}
+
+TEST_F(LazilyBuildDependenciesTest, Type) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'message1.proto' "
+      "dependency: 'message2.proto' "
+      "dependency: 'enum1.proto' "
+      "dependency: 'enum2.proto' "
+      "message_type { "
+      "  name:'Lazy' "
+      "  field { name:'message1' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Message1' } "
+      "  field { name:'message2' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Message2' } "
+      "  field { name:'enum1' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Enum1' } "
+      "  field { name:'enum2' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Enum2' } "
+      "}");
+  AddSimpleMessageProtoFileToDb("message1", "Message1");
+  AddSimpleMessageProtoFileToDb("message2", "Message2");
+  AddSimpleEnumProtoFileToDb("enum1", "Enum1", "ENUM1");
+  AddSimpleEnumProtoFileToDb("enum2", "Enum2", "ENUM2");
+
+  const FileDescriptor* file = pool_.FindFileByName("foo.proto");
+
+  // Verify calling type() on a field that is a message type will
+  // build the type defined in another file.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("message1.proto"));
+  const Descriptor* desc = file->FindMessageTypeByName("Lazy");
+  EXPECT_TRUE(desc != NULL);
+  const FieldDescriptor* field = desc->FindFieldByName("message1");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_EQ(field->type(), FieldDescriptor::TYPE_MESSAGE);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("message1.proto"));
+
+  // Verify calling cpp_type() on a field that is a message type will
+  // build the type defined in another file.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("message2.proto"));
+  field = desc->FindFieldByName("message2");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_EQ(field->cpp_type(), FieldDescriptor::CPPTYPE_MESSAGE);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("message2.proto"));
+
+  // Verify calling type() on a field that is an enum type will
+  // build the type defined in another file.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("enum1.proto"));
+  field = desc->FindFieldByName("enum1");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_EQ(field->type(), FieldDescriptor::TYPE_ENUM);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("enum1.proto"));
+
+  // Verify calling cpp_type() on a field that is an enum type will
+  // build the type defined in another file.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("enum2.proto"));
+  field = desc->FindFieldByName("enum2");
+  EXPECT_TRUE(field != NULL);
+  EXPECT_EQ(field->cpp_type(), FieldDescriptor::CPPTYPE_ENUM);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("enum2.proto"));
+}
+
+TEST_F(LazilyBuildDependenciesTest, Extension) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'bar.proto' "
+      "dependency: 'baz.proto' "
+      "extension { extendee: '.protobuf_unittest.Bar' name:'bar' number:11"
+      "            label:LABEL_OPTIONAL type_name:'.protobuf_unittest.Baz' }");
+  ParseProtoAndAddToDb(
+      "name: 'bar.proto' "
+      "package: 'protobuf_unittest' "
+      "message_type { "
+      "  name:'Bar' "
+      "  extension_range { start: 10 end: 20 }"
+      "}");
+  AddSimpleMessageProtoFileToDb("baz", "Baz");
+
+  // Verify none have been built yet.
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("foo.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("bar.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("baz.proto"));
+
+  const FileDescriptor* file = pool_.FindFileByName("foo.proto");
+
+  // Verify foo.bar gets loaded, and bar.proto gets loaded
+  // to register the extension. baz.proto should not get loaded.
+  EXPECT_TRUE(file != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("foo.proto"));
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("bar.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("baz.proto"));
+}
+
+TEST_F(LazilyBuildDependenciesTest, Service) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'message1.proto' "
+      "dependency: 'message2.proto' "
+      "dependency: 'message3.proto' "
+      "dependency: 'message4.proto' "
+      "service {"
+      "  name: 'LazyService'"
+      "  method { name: 'A' input_type:  '.protobuf_unittest.Message1' "
+      "                     output_type: '.protobuf_unittest.Message2' }"
+      "}");
+  AddSimpleMessageProtoFileToDb("message1", "Message1");
+  AddSimpleMessageProtoFileToDb("message2", "Message2");
+  AddSimpleMessageProtoFileToDb("message3", "Message3");
+  AddSimpleMessageProtoFileToDb("message4", "Message4");
+
+  const FileDescriptor* file = pool_.FindFileByName("foo.proto");
+
+  // Verify calling FindServiceByName or FindMethodByName doesn't build the
+  // files defining the input and output type, and input_type() and
+  // output_type() does indeed build the appropriate files.
+  const ServiceDescriptor* service = file->FindServiceByName("LazyService");
+  EXPECT_TRUE(service != NULL);
+  const MethodDescriptor* method = service->FindMethodByName("A");
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("message1.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("message2.proto"));
+  EXPECT_TRUE(method != NULL);
+  EXPECT_TRUE(method->input_type() != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("message1.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("message2.proto"));
+  EXPECT_TRUE(method->output_type() != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("message2.proto"));
+}
+
+
+TEST_F(LazilyBuildDependenciesTest, GeneratedFile) {
+  // Most testing is done with custom pools with lazy dependencies forced on,
+  // do some sanity checking that lazy imports is on by default for the
+  // generated pool, and do custom options testing with generated to
+  // be able to use the GetExtension ids for the custom options.
+
+  // Verify none of the files are loaded yet.
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_custom_option.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_enum.proto"));
+
+  // Verify calling autogenerated function to get a descriptor in the base
+  // file will build that file but none of it's imports. This verifies that
+  // lazily_build_dependencies_ is set on the generated pool, and also that
+  // the generated function "descriptor()" doesn't somehow subvert the laziness
+  // by manually loading the dependencies or something.
+  EXPECT_TRUE(protobuf_unittest::lazy_imports::ImportedMessage::descriptor() !=
+              NULL);
+  EXPECT_TRUE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_custom_option.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_enum.proto"));
+
+  // Verify custom options work when defined in an import that isn't loaded,
+  // and that a non-default value of a custom option doesn't load the file
+  // where that enum is defined.
+  const google::protobuf::MessageOptions& options =
+      protobuf_unittest::lazy_imports::MessageCustomOption::descriptor()
+          ->options();
+  protobuf_unittest::lazy_imports::LazyEnum custom_option_value =
+      options.GetExtension(protobuf_unittest::lazy_imports::lazy_enum_option);
+
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_custom_option.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_enum.proto"));
+  EXPECT_EQ(custom_option_value, protobuf_unittest::lazy_imports::LAZY_ENUM_1);
+
+  const google::protobuf::MessageOptions& options2 =
+      protobuf_unittest::lazy_imports::MessageCustomOption2::descriptor()
+          ->options();
+  custom_option_value =
+      options2.GetExtension(protobuf_unittest::lazy_imports::lazy_enum_option);
+
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_custom_option.proto"));
+  EXPECT_FALSE(DescriptorPool::generated_pool()->InternalIsFileLoaded(
+      "google/protobuf/unittest_lazy_dependencies_enum.proto"));
+  EXPECT_EQ(custom_option_value, protobuf_unittest::lazy_imports::LAZY_ENUM_0);
+}
+
+TEST_F(LazilyBuildDependenciesTest, Dependency) {
+  ParseProtoAndAddToDb(
+      "name: 'foo.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'bar.proto' "
+      "message_type { "
+      "  name:'Foo' "
+      "  field { name:'bar' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Bar' } "
+      "}");
+  ParseProtoAndAddToDb(
+      "name: 'bar.proto' "
+      "package: 'protobuf_unittest' "
+      "dependency: 'baz.proto' "
+      "message_type { "
+      "  name:'Bar' "
+      "  field { name:'baz' number:1 label:LABEL_OPTIONAL "
+      "type_name:'.protobuf_unittest.Baz' } "
+      "}");
+  AddSimpleMessageProtoFileToDb("baz", "Baz");
+
+  const FileDescriptor* foo_file = pool_.FindFileByName("foo.proto");
+  EXPECT_TRUE(foo_file != NULL);
+  // As expected, requesting foo.proto shouldn't build it's dependencies
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("foo.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("bar.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("baz.proto"));
+
+  // Verify calling dependency(N) will build the dependency, but
+  // not that file's dependencies.
+  const FileDescriptor* bar_file = foo_file->dependency(0);
+  EXPECT_TRUE(bar_file != NULL);
+  EXPECT_TRUE(pool_.InternalIsFileLoaded("bar.proto"));
+  EXPECT_FALSE(pool_.InternalIsFileLoaded("baz.proto"));
+}
+
+// ===================================================================
+
 
 }  // namespace descriptor_unittest
 }  // namespace protobuf
diff --git a/src/google/protobuf/drop_unknown_fields_test.cc b/src/google/protobuf/drop_unknown_fields_test.cc
index 6f16dc53..437a04e7 100644
--- a/src/google/protobuf/drop_unknown_fields_test.cc
+++ b/src/google/protobuf/drop_unknown_fields_test.cc
@@ -29,12 +29,10 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/unittest_drop_unknown_fields.pb.h>
 #include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/message_lite.h>
 #include <gtest/gtest.h>
 
 namespace google {
@@ -43,7 +41,8 @@ using unittest_drop_unknown_fields::FooWithExtraFields;
 
 namespace protobuf {
 
-TEST(DropUnknownFieldsTest, GeneratedMessage) {
+TEST(DropUnknownFieldsTest, GeneratedMessageDefaultDrop) {
+  ::google::protobuf::internal::SetProto3PreserveUnknownsDefault(false);
   FooWithExtraFields foo_with_extra_fields;
   foo_with_extra_fields.set_int32_value(1);
   foo_with_extra_fields.set_enum_value(FooWithExtraFields::QUX);
@@ -54,8 +53,6 @@ TEST(DropUnknownFieldsTest, GeneratedMessage) {
   EXPECT_EQ(1, foo.int32_value());
   EXPECT_EQ(static_cast<int>(FooWithExtraFields::QUX),
             static_cast<int>(foo.enum_value()));
-  // We don't generate unknown field accessors but the UnknownFieldSet is
-  // still exposed through reflection API.
   EXPECT_TRUE(foo.GetReflection()->GetUnknownFields(foo).empty());
 
   ASSERT_TRUE(foo_with_extra_fields.ParseFromString(foo.SerializeAsString()));
@@ -65,14 +62,36 @@ TEST(DropUnknownFieldsTest, GeneratedMessage) {
   EXPECT_EQ(0, foo_with_extra_fields.extra_int32_value());
 }
 
-TEST(DropUnknownFieldsTest, DynamicMessage) {
+TEST(DropUnknownFieldsTest, GeneratedMessageDefaultPreserve) {
+  ::google::protobuf::internal::SetProto3PreserveUnknownsDefault(true);
+  FooWithExtraFields foo_with_extra_fields;
+  foo_with_extra_fields.set_int32_value(1);
+  foo_with_extra_fields.set_enum_value(FooWithExtraFields::QUX);
+  foo_with_extra_fields.set_extra_int32_value(2);
+
+  Foo foo;
+  ASSERT_TRUE(foo.ParseFromString(foo_with_extra_fields.SerializeAsString()));
+  EXPECT_EQ(1, foo.int32_value());
+  EXPECT_EQ(static_cast<int>(FooWithExtraFields::QUX),
+            static_cast<int>(foo.enum_value()));
+  EXPECT_FALSE(foo.GetReflection()->GetUnknownFields(foo).empty());
+
+  ASSERT_TRUE(foo_with_extra_fields.ParseFromString(foo.SerializeAsString()));
+  EXPECT_EQ(1, foo_with_extra_fields.int32_value());
+  EXPECT_EQ(FooWithExtraFields::QUX, foo_with_extra_fields.enum_value());
+  // The "extra_int32_value" field should not be lost.
+  EXPECT_EQ(2, foo_with_extra_fields.extra_int32_value());
+}
+
+TEST(DropUnknownFieldsTest, DynamicMessageDefaultDrop) {
+  internal::SetProto3PreserveUnknownsDefault(false);
   FooWithExtraFields foo_with_extra_fields;
   foo_with_extra_fields.set_int32_value(1);
   foo_with_extra_fields.set_enum_value(FooWithExtraFields::QUX);
   foo_with_extra_fields.set_extra_int32_value(2);
 
   google::protobuf::DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<google::protobuf::Message> foo(
+  std::unique_ptr<google::protobuf::Message> foo(
       factory.GetPrototype(Foo::descriptor())->New());
   ASSERT_TRUE(foo->ParseFromString(foo_with_extra_fields.SerializeAsString()));
   EXPECT_TRUE(foo->GetReflection()->GetUnknownFields(*foo).empty());
@@ -84,5 +103,25 @@ TEST(DropUnknownFieldsTest, DynamicMessage) {
   EXPECT_EQ(0, foo_with_extra_fields.extra_int32_value());
 }
 
+TEST(DropUnknownFieldsTest, DynamicMessageDefaultPreserve) {
+  internal::SetProto3PreserveUnknownsDefault(true);
+  FooWithExtraFields foo_with_extra_fields;
+  foo_with_extra_fields.set_int32_value(1);
+  foo_with_extra_fields.set_enum_value(FooWithExtraFields::QUX);
+  foo_with_extra_fields.set_extra_int32_value(2);
+
+  google::protobuf::DynamicMessageFactory factory;
+  std::unique_ptr<google::protobuf::Message> foo(
+      factory.GetPrototype(Foo::descriptor())->New());
+  ASSERT_TRUE(foo->ParseFromString(foo_with_extra_fields.SerializeAsString()));
+  EXPECT_FALSE(foo->GetReflection()->GetUnknownFields(*foo).empty());
+
+  ASSERT_TRUE(foo_with_extra_fields.ParseFromString(foo->SerializeAsString()));
+  EXPECT_EQ(1, foo_with_extra_fields.int32_value());
+  EXPECT_EQ(FooWithExtraFields::QUX, foo_with_extra_fields.enum_value());
+  // The "extra_int32_value" field should not be lost.
+  EXPECT_EQ(2, foo_with_extra_fields.extra_int32_value());
+}
+
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/duration.pb.cc b/src/google/protobuf/duration.pb.cc
index e046cc5a..ddc063db 100644
--- a/src/google/protobuf/duration.pb.cc
+++ b/src/google/protobuf/duration.pb.cc
@@ -1,95 +1,92 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/duration.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class DurationDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Duration> {
+class DurationDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Duration>
+      _instance;
 } _Duration_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fduration_2eproto {
+static void InitDefaultsDuration() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_Duration_default_instance_;
+    new (ptr) ::google::protobuf::Duration();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Duration::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Duration =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsDuration}, {}};
 
-::google::protobuf::Metadata file_level_metadata[1];
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Duration.base);
+}
 
-}  // namespace
+::google::protobuf::Metadata file_level_metadata[1];
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Duration, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, seconds_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Duration, nanos_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Duration, seconds_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Duration, nanos_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Duration)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Duration)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Duration_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Duration_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/duration.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/duration.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Duration_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _Duration_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\036google/protobuf/duration.proto\022\017google"
       ".protobuf\"*\n\010Duration\022\017\n\007seconds\030\001 \001(\003\022\r"
       "\n\005nanos\030\002 \001(\005B|\n\023com.google.protobufB\rDu"
@@ -101,25 +98,26 @@ void AddDescriptorsImpl() {
       descriptor, 227);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/duration.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fduration_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void Duration::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Duration::kSecondsFieldNumber;
 const int Duration::kNanosFieldNumber;
@@ -127,37 +125,33 @@ const int Duration::kNanosFieldNumber;
 
 Duration::Duration()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fduration_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fduration_2eproto::scc_info_Duration.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Duration)
 }
 Duration::Duration(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fduration_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fduration_2eproto::scc_info_Duration.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Duration)
 }
 Duration::Duration(const Duration& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   ::memcpy(&seconds_, &from.seconds_,
-    reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
+    static_cast<size_t>(reinterpret_cast<char*>(&nanos_) -
+    reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Duration)
 }
 
 void Duration::SharedCtor() {
-  ::memset(&seconds_, 0, reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
-  _cached_size_ = 0;
+  ::memset(&seconds_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&nanos_) -
+      reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
 }
 
 Duration::~Duration() {
@@ -166,11 +160,7 @@ Duration::~Duration() {
 }
 
 void Duration::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Duration::ArenaDtor(void* object) {
@@ -180,28 +170,29 @@ void Duration::ArenaDtor(void* object) {
 void Duration::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Duration::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Duration::descriptor() {
-  protobuf_google_2fprotobuf_2fduration_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fduration_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fduration_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fduration_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Duration& Duration::default_instance() {
-  protobuf_google_2fprotobuf_2fduration_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fduration_2eproto::scc_info_Duration.base);
   return *internal_default_instance();
 }
 
-Duration* Duration::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Duration>(arena);
-}
 
 void Duration::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Duration)
-  ::memset(&seconds_, 0, reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  ::memset(&seconds_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&nanos_) -
+      reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
+  _internal_metadata_.Clear();
 }
 
 bool Duration::MergePartialFromCodedStream(
@@ -210,14 +201,14 @@ bool Duration::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Duration)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // int64 seconds = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int64, ::google::protobuf::internal::WireFormatLite::TYPE_INT64>(
@@ -231,7 +222,7 @@ bool Duration::MergePartialFromCodedStream(
       // int32 nanos = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -244,12 +235,11 @@ bool Duration::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -266,6 +256,9 @@ failure:
 void Duration::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Duration)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteInt64(1, this->seconds(), output);
@@ -276,13 +269,20 @@ void Duration::SerializeWithCachedSizes(
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->nanos(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Duration)
 }
 
 ::google::protobuf::uint8* Duration::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Duration)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt64ToArray(1, this->seconds(), target);
@@ -293,6 +293,10 @@ void Duration::SerializeWithCachedSizes(
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->nanos(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Duration)
   return target;
 }
@@ -301,6 +305,11 @@ size_t Duration::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Duration)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     total_size += 1 +
@@ -316,9 +325,7 @@ size_t Duration::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -341,6 +348,9 @@ void Duration::MergeFrom(const Duration& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Duration)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.seconds() != 0) {
     set_seconds(from.seconds());
   }
@@ -387,51 +397,26 @@ void Duration::UnsafeArenaSwap(Duration* other) {
   InternalSwap(other);
 }
 void Duration::InternalSwap(Duration* other) {
-  std::swap(seconds_, other->seconds_);
-  std::swap(nanos_, other->nanos_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(seconds_, other->seconds_);
+  swap(nanos_, other->nanos_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Duration::GetMetadata() const {
   protobuf_google_2fprotobuf_2fduration_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fduration_2eproto::file_level_metadata[0];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Duration
-
-// int64 seconds = 1;
-void Duration::clear_seconds() {
-  seconds_ = GOOGLE_LONGLONG(0);
-}
-::google::protobuf::int64 Duration::seconds() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Duration.seconds)
-  return seconds_;
-}
-void Duration::set_seconds(::google::protobuf::int64 value) {
-  
-  seconds_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Duration.seconds)
-}
-
-// int32 nanos = 2;
-void Duration::clear_nanos() {
-  nanos_ = 0;
-}
-::google::protobuf::int32 Duration::nanos() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Duration.nanos)
-  return nanos_;
-}
-void Duration::set_nanos(::google::protobuf::int32 value) {
-  
-  nanos_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Duration.nanos)
+  return ::protobuf_google_2fprotobuf_2fduration_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Duration* Arena::CreateMaybeMessage< ::google::protobuf::Duration >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Duration >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/duration.pb.h b/src/google/protobuf/duration.pb.h
index 591c11d1..3d0889d1 100644
--- a/src/google/protobuf/duration.pb.h
+++ b/src/google/protobuf/duration.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/duration.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fduration_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fduration_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fduration_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fduration_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fduration_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fduration_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fduration_2eproto
 namespace google {
 namespace protobuf {
 class Duration;
@@ -36,20 +52,13 @@ class DurationDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern DurationDefaultTypeInternal _Duration_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fduration_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fduration_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Duration* Arena::CreateMaybeMessage<::google::protobuf::Duration>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -64,53 +73,73 @@ class LIBPROTOBUF_EXPORT Duration : public ::google::protobuf::Message /* @@prot
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Duration(Duration&& from) noexcept
+    : Duration() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Duration& operator=(Duration&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Duration& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Duration* internal_default_instance() {
     return reinterpret_cast<const Duration*>(
                &_Duration_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void UnsafeArenaSwap(Duration* other);
   void Swap(Duration* other);
+  friend void swap(Duration& a, Duration& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Duration* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Duration* New() const final {
+    return CreateMaybeMessage<Duration>(NULL);
+  }
 
-  Duration* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Duration* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Duration>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Duration& from);
   void MergeFrom(const Duration& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Duration* other);
   protected:
   explicit Duration(::google::protobuf::Arena* arena);
@@ -126,7 +155,7 @@ class LIBPROTOBUF_EXPORT Duration : public ::google::protobuf::Message /* @@prot
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -148,20 +177,23 @@ class LIBPROTOBUF_EXPORT Duration : public ::google::protobuf::Message /* @@prot
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::int64 seconds_;
   ::google::protobuf::int32 nanos_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fduration_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fduration_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Duration
 
 // int64 seconds = 1;
@@ -192,14 +224,15 @@ inline void Duration::set_nanos(::google::protobuf::int32 value) {
   // @@protoc_insertion_point(field_set:google.protobuf.Duration.nanos)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fduration_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fduration_2eproto
diff --git a/src/google/protobuf/duration.proto b/src/google/protobuf/duration.proto
index 7f461f40..975fce41 100644
--- a/src/google/protobuf/duration.proto
+++ b/src/google/protobuf/duration.proto
@@ -47,6 +47,8 @@ option objc_class_prefix = "GPB";
 // two Timestamp values is a Duration and it can be added or subtracted
 // from a Timestamp. Range is approximately +-10,000 years.
 //
+// # Examples
+//
 // Example 1: Compute Duration from two Timestamps in pseudo code.
 //
 //     Timestamp start = ...;
@@ -87,11 +89,22 @@ option objc_class_prefix = "GPB";
 //     duration = Duration()
 //     duration.FromTimedelta(td)
 //
+// # JSON Mapping
+//
+// In JSON format, the Duration type is encoded as a string rather than an
+// object, where the string ends in the suffix "s" (indicating seconds) and
+// is preceded by the number of seconds, with nanoseconds expressed as
+// fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+// encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+// be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+// microsecond should be expressed in JSON format as "3.000001s".
+//
 //
 message Duration {
 
   // Signed seconds of the span of time. Must be from -315,576,000,000
-  // to +315,576,000,000 inclusive.
+  // to +315,576,000,000 inclusive. Note: these bounds are computed from:
+  // 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
   int64 seconds = 1;
 
   // Signed fractions of a second at nanosecond resolution of the span
diff --git a/src/google/protobuf/dynamic_message.cc b/src/google/protobuf/dynamic_message.cc
index d6bde495..ceedf500 100644
--- a/src/google/protobuf/dynamic_message.cc
+++ b/src/google/protobuf/dynamic_message.cc
@@ -65,9 +65,6 @@
 #include <algorithm>
 #include <google/protobuf/stubs/hash.h>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/common.h>
 
@@ -77,13 +74,14 @@
 #include <google/protobuf/generated_message_util.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/extension_set.h>
+#include <google/protobuf/map_field.h>
 #include <google/protobuf/map_field_inl.h>
+#include <google/protobuf/map_type_handler.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/repeated_field.h>
-#include <google/protobuf/map_type_handler.h>
-#include <google/protobuf/extension_set.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/map_field.h>
+
 
 namespace google {
 namespace protobuf {
@@ -231,14 +229,15 @@ class DynamicMessage : public Message {
 
     // Warning:  The order in which the following pointers are defined is
     //   important (the prototype must be deleted *before* the offsets).
-    google::protobuf::scoped_array<uint32> offsets;
-    google::protobuf::scoped_array<uint32> has_bits_indices;
-    google::protobuf::scoped_ptr<const GeneratedMessageReflection> reflection;
-    // Don't use a scoped_ptr to hold the prototype: the destructor for
+    std::unique_ptr<uint32[]> offsets;
+    std::unique_ptr<uint32[]> has_bits_indices;
+    std::unique_ptr<const GeneratedMessageReflection> reflection;
+    // Don't use a unique_ptr to hold the prototype: the destructor for
     // DynamicMessage needs to know whether it is the prototype, and does so by
     // looking back at this field. This would assume details about the
-    // implementation of scoped_ptr.
+    // implementation of unique_ptr.
     const DynamicMessage* prototype;
+    int weak_field_map_offset;  // The offset for the weak_field_map;
 
     TypeInfo() : prototype(NULL) {}
 
@@ -248,6 +247,10 @@ class DynamicMessage : public Message {
   };
 
   DynamicMessage(const TypeInfo* type_info);
+
+  // This should only be used by GetPrototypeNoLock() to avoid dead lock.
+  DynamicMessage(const TypeInfo* type_info, bool lock_factory);
+
   ~DynamicMessage();
 
   // Called on the prototype after construction to initialize message fields.
@@ -257,7 +260,7 @@ class DynamicMessage : public Message {
 
   Message* New() const;
   Message* New(::google::protobuf::Arena* arena) const;
-  ::google::protobuf::Arena* GetArena() const { return NULL; };
+  ::google::protobuf::Arena* GetArena() const { return arena_; }
 
   int GetCachedSize() const;
   void SetCachedSize(int size) const;
@@ -276,9 +279,9 @@ class DynamicMessage : public Message {
 #endif  // !_MSC_VER
 
  private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DynamicMessage);
   DynamicMessage(const TypeInfo* type_info, ::google::protobuf::Arena* arena);
-  void SharedCtor();
+
+  void SharedCtor(bool lock_factory);
 
   inline bool is_prototype() const {
     return type_info_->prototype == this ||
@@ -295,24 +298,29 @@ class DynamicMessage : public Message {
   }
 
   const TypeInfo* type_info_;
+  Arena* const arena_;
   // TODO(kenton):  Make this an atomic<int> when C++ supports it.
   mutable int cached_byte_size_;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DynamicMessage);
 };
 
 DynamicMessage::DynamicMessage(const TypeInfo* type_info)
-  : type_info_(type_info),
-    cached_byte_size_(0) {
-  SharedCtor();
+    : type_info_(type_info), arena_(NULL), cached_byte_size_(0) {
+  SharedCtor(true);
 }
 
 DynamicMessage::DynamicMessage(const TypeInfo* type_info,
                                ::google::protobuf::Arena* arena)
-  : type_info_(type_info),
-    cached_byte_size_(0) {
-  SharedCtor();
+    : type_info_(type_info), arena_(arena), cached_byte_size_(0) {
+  SharedCtor(true);
 }
 
-void DynamicMessage::SharedCtor() {
+DynamicMessage::DynamicMessage(const TypeInfo* type_info, bool lock_factory)
+    : type_info_(type_info), arena_(NULL), cached_byte_size_(0) {
+  SharedCtor(lock_factory);
+}
+
+void DynamicMessage::SharedCtor(bool lock_factory) {
   // We need to call constructors for various fields manually and set
   // default values where appropriate.  We use placement new to call
   // constructors.  If you haven't heard of placement new, I suggest Googling
@@ -323,7 +331,6 @@ void DynamicMessage::SharedCtor() {
   // constructor.)
 
   const Descriptor* descriptor = type_info_->type;
-
   // Initialize oneof cases.
   for (int i = 0 ; i < descriptor->oneof_decl_count(); ++i) {
     new (OffsetToPointer(type_info_->oneof_case_offset + sizeof(uint32) * i))
@@ -331,12 +338,11 @@ void DynamicMessage::SharedCtor() {
   }
 
   new (OffsetToPointer(type_info_->internal_metadata_offset))
-      InternalMetadataWithArena;
+      InternalMetadataWithArena(arena_);
 
   if (type_info_->extensions_offset != -1) {
-    new (OffsetToPointer(type_info_->extensions_offset)) ExtensionSet;
+    new (OffsetToPointer(type_info_->extensions_offset)) ExtensionSet(arena_);
   }
-
   for (int i = 0; i < descriptor->field_count(); i++) {
     const FieldDescriptor* field = descriptor->field(i);
     void* field_ptr = OffsetToPointer(type_info_->offsets[i]);
@@ -344,14 +350,14 @@ void DynamicMessage::SharedCtor() {
       continue;
     }
     switch (field->cpp_type()) {
-#define HANDLE_TYPE(CPPTYPE, TYPE)                                           \
-      case FieldDescriptor::CPPTYPE_##CPPTYPE:                               \
-        if (!field->is_repeated()) {                                         \
-          new(field_ptr) TYPE(field->default_value_##TYPE());                \
-        } else {                                                             \
-          new(field_ptr) RepeatedField<TYPE>();                              \
-        }                                                                    \
-        break;
+#define HANDLE_TYPE(CPPTYPE, TYPE)                         \
+  case FieldDescriptor::CPPTYPE_##CPPTYPE:                 \
+    if (!field->is_repeated()) {                           \
+      new (field_ptr) TYPE(field->default_value_##TYPE()); \
+    } else {                                               \
+      new (field_ptr) RepeatedField<TYPE>(arena_);         \
+    }                                                      \
+    break;
 
       HANDLE_TYPE(INT32 , int32 );
       HANDLE_TYPE(INT64 , int64 );
@@ -366,7 +372,7 @@ void DynamicMessage::SharedCtor() {
         if (!field->is_repeated()) {
           new(field_ptr) int(field->default_value_enum()->number());
         } else {
-          new(field_ptr) RepeatedField<int>();
+          new (field_ptr) RepeatedField<int>(arena_);
         }
         break;
 
@@ -387,7 +393,7 @@ void DynamicMessage::SharedCtor() {
               ArenaStringPtr* asp = new(field_ptr) ArenaStringPtr();
               asp->UnsafeSetDefault(default_value);
             } else {
-              new(field_ptr) RepeatedPtrField<string>();
+              new (field_ptr) RepeatedPtrField<string>(arena_);
             }
             break;
         }
@@ -398,10 +404,32 @@ void DynamicMessage::SharedCtor() {
           new(field_ptr) Message*(NULL);
         } else {
           if (IsMapFieldInApi(field)) {
-            new (field_ptr) DynamicMapField(
-                type_info_->factory->GetPrototypeNoLock(field->message_type()));
+            // We need to lock in most cases to avoid data racing. Only not lock
+            // when the constructor is called inside GetPrototype(), in which
+            // case we have already locked the factory.
+            if (lock_factory) {
+              if (arena_ != NULL) {
+                new (field_ptr) DynamicMapField(
+                    type_info_->factory->GetPrototype(field->message_type()),
+                    arena_);
+              } else {
+                new (field_ptr) DynamicMapField(
+                    type_info_->factory->GetPrototype(field->message_type()));
+              }
+            } else {
+              if (arena_ != NULL) {
+                new (field_ptr)
+                    DynamicMapField(type_info_->factory->GetPrototypeNoLock(
+                                        field->message_type()),
+                                    arena_);
+              } else {
+                new (field_ptr)
+                    DynamicMapField(type_info_->factory->GetPrototypeNoLock(
+                        field->message_type()));
+              }
+            }
           } else {
-            new (field_ptr) RepeatedPtrField<Message>();
+            new (field_ptr) RepeatedPtrField<Message>(arena_);
           }
         }
         break;
@@ -537,7 +565,6 @@ void DynamicMessage::CrossLinkPrototypes() {
   for (int i = 0; i < descriptor->field_count(); i++) {
     const FieldDescriptor* field = descriptor->field(i);
     void* field_ptr = OffsetToPointer(type_info_->offsets[i]);
-
     if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
         !field->is_repeated()) {
       // For fields with message types, we need to cross-link with the
@@ -550,19 +577,17 @@ void DynamicMessage::CrossLinkPrototypes() {
   }
 }
 
-Message* DynamicMessage::New() const {
-  void* new_base = operator new(type_info_->size);
-  memset(new_base, 0, type_info_->size);
-  return new(new_base) DynamicMessage(type_info_);
-}
+Message* DynamicMessage::New() const { return New(NULL); }
 
 Message* DynamicMessage::New(::google::protobuf::Arena* arena) const {
   if (arena != NULL) {
-    Message* message = New();
-    arena->Own(message);
-    return message;
+    void* new_base = Arena::CreateArray<char>(arena, type_info_->size);
+    memset(new_base, 0, type_info_->size);
+    return new (new_base) DynamicMessage(type_info_, arena);
   } else {
-    return New();
+    void* new_base = operator new(type_info_->size);
+    memset(new_base, 0, type_info_->size);
+    return new (new_base) DynamicMessage(type_info_);
   }
 }
 
@@ -694,6 +719,7 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
   // All the fields.
   //
   // TODO(b/31226269):  Optimize the order of fields to minimize padding.
+  int num_weak_fields = 0;
   for (int i = 0; i < type->field_count(); i++) {
     // Make sure field is aligned to avoid bus errors.
     // Oneof fields do not use any space.
@@ -717,6 +743,8 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
   type_info->internal_metadata_offset = size;
   size += sizeof(InternalMetadataWithArena);
 
+  type_info->weak_field_map_offset = -1;
+
   // Align the final size to make sure no clever allocators think that
   // alignment is not necessary.
   type_info->size = size;
@@ -738,7 +766,6 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
     }
   }
   size = AlignOffset(size);
-
   // Allocate the prototype + oneof fields.
   void* base = operator new(size);
   memset(base, 0, size);
@@ -750,9 +777,12 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
   // map). To break the cyclic dependency, we have to assgin the address of
   // prototype into type_info first.
   type_info->prototype = static_cast<DynamicMessage*>(base);
-  DynamicMessage* prototype = new(base) DynamicMessage(type_info);
 
-  if (type->oneof_decl_count() > 0) {
+  // We have already locked the factory so we should not lock in the constructor
+  // of dynamic message to avoid dead lock.
+  DynamicMessage* prototype = new (base) DynamicMessage(type_info, false);
+
+  if (type->oneof_decl_count() > 0 || num_weak_fields > 0) {
     // Construct default oneof instance.
     ConstructDefaultOneofInstance(type_info->type,
                                   type_info->offsets.get(),
@@ -767,7 +797,8 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
       type_info->internal_metadata_offset,
       type_info->extensions_offset,
       type_info->oneof_case_offset,
-      type_info->size};
+      type_info->size,
+      type_info->weak_field_map_offset};
 
   type_info->reflection.reset(new GeneratedMessageReflection(
       type_info->type, schema, type_info->pool, this));
@@ -781,12 +812,12 @@ const Message* DynamicMessageFactory::GetPrototypeNoLock(
 void DynamicMessageFactory::ConstructDefaultOneofInstance(
     const Descriptor* type,
     const uint32 offsets[],
-    void* default_oneof_instance) {
+    void* default_oneof_or_weak_instance) {
   for (int i = 0; i < type->oneof_decl_count(); i++) {
     for (int j = 0; j < type->oneof_decl(i)->field_count(); j++) {
       const FieldDescriptor* field = type->oneof_decl(i)->field(j);
       void* field_ptr = reinterpret_cast<uint8*>(
-          default_oneof_instance) + offsets[field->index()];
+          default_oneof_or_weak_instance) + offsets[field->index()];
       switch (field->cpp_type()) {
 #define HANDLE_TYPE(CPPTYPE, TYPE)                                      \
         case FieldDescriptor::CPPTYPE_##CPPTYPE:                        \
diff --git a/src/google/protobuf/dynamic_message.h b/src/google/protobuf/dynamic_message.h
index 816170ea..d84cc8af 100644
--- a/src/google/protobuf/dynamic_message.h
+++ b/src/google/protobuf/dynamic_message.h
@@ -40,9 +40,6 @@
 
 #include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/message.h>
@@ -130,7 +127,7 @@ class LIBPROTOBUF_EXPORT DynamicMessageFactory : public MessageFactory {
   // public header (for good reason), but dynamic_message.h is, and public
   // headers may only #include other public headers.
   struct PrototypeMap;
-  google::protobuf::scoped_ptr<PrototypeMap> prototypes_;
+  std::unique_ptr<PrototypeMap> prototypes_;
   mutable Mutex prototypes_mutex_;
 
   friend class DynamicMessage;
@@ -156,24 +153,24 @@ class LIBPROTOBUF_EXPORT DynamicMapSorter {
                                           int map_size,
                                           const Reflection* reflection,
                                           const FieldDescriptor* field) {
-    std::vector<const Message*> result(map_size);
+    std::vector<const Message*> result(static_cast<size_t>(map_size));
     const RepeatedPtrField<Message>& map_field =
         reflection->GetRepeatedPtrField<Message>(message, field);
-    int i = 0;
+    size_t i = 0;
     for (RepeatedPtrField<Message>::const_pointer_iterator it =
              map_field.pointer_begin(); it != map_field.pointer_end(); ) {
       result[i++] = *it++;
     }
-    GOOGLE_DCHECK_EQ(result.size(), static_cast<size_t>(i));
+    GOOGLE_DCHECK_EQ(result.size(), i);
     MapEntryMessageComparator comparator(field->message_type());
-    std::sort(result.begin(), result.end(), comparator);
+    std::stable_sort(result.begin(), result.end(), comparator);
     // Complain if the keys aren't in ascending order.
 #ifndef NDEBUG
-    for (int j = 1; j < map_size; j++) {
+    for (size_t j = 1; j < static_cast<size_t>(map_size); j++) {
       if (!comparator(result[j - 1], result[j])) {
         GOOGLE_LOG(ERROR) << (comparator(result[j], result[j - 1]) ?
-                       "internal error in map key sorting" :
-                       "map keys are not unique");
+                      "internal error in map key sorting" :
+                      "map keys are not unique");
       }
     }
 #endif
diff --git a/src/google/protobuf/dynamic_message_unittest.cc b/src/google/protobuf/dynamic_message_unittest.cc
index fe51d8cf..94446b08 100644
--- a/src/google/protobuf/dynamic_message_unittest.cc
+++ b/src/google/protobuf/dynamic_message_unittest.cc
@@ -41,16 +41,13 @@
 // DynamicMessage.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
-#include <google/protobuf/dynamic_message.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/test_util.h>
 #include <google/protobuf/unittest.pb.h>
 #include <google/protobuf/unittest_no_field_presence.pb.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/dynamic_message.h>
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -60,7 +57,7 @@
 namespace google {
 namespace protobuf {
 
-class DynamicMessageTest : public testing::Test {
+class DynamicMessageTest : public ::testing::TestWithParam<bool> {
  protected:
   DescriptorPool pool_;
   DynamicMessageFactory factory_;
@@ -144,38 +141,54 @@ TEST_F(DynamicMessageTest, Defaults) {
   reflection_tester.ExpectClearViaReflection(*prototype_);
 }
 
-TEST_F(DynamicMessageTest, IndependentOffsets) {
+TEST_P(DynamicMessageTest, IndependentOffsets) {
   // Check that all fields have independent offsets by setting each
   // one to a unique value then checking that they all still have those
   // unique values (i.e. they don't stomp each other).
-  google::protobuf::scoped_ptr<Message> message(prototype_->New());
+  Arena arena;
+  Message* message = prototype_->New(GetParam()? &arena : NULL);
   TestUtil::ReflectionTester reflection_tester(descriptor_);
 
-  reflection_tester.SetAllFieldsViaReflection(message.get());
+  reflection_tester.SetAllFieldsViaReflection(message);
   reflection_tester.ExpectAllFieldsSetViaReflection(*message);
+
+  if (!GetParam()) {
+    delete message;
+  }
 }
 
-TEST_F(DynamicMessageTest, Extensions) {
+TEST_P(DynamicMessageTest, Extensions) {
   // Check that extensions work.
-  google::protobuf::scoped_ptr<Message> message(extensions_prototype_->New());
+  Arena arena;
+  Message* message = extensions_prototype_->New(GetParam()? &arena : NULL);
   TestUtil::ReflectionTester reflection_tester(extensions_descriptor_);
 
-  reflection_tester.SetAllFieldsViaReflection(message.get());
+  reflection_tester.SetAllFieldsViaReflection(message);
   reflection_tester.ExpectAllFieldsSetViaReflection(*message);
+
+  if (!GetParam()) {
+    delete message;
+  }
 }
 
-TEST_F(DynamicMessageTest, PackedFields) {
+TEST_P(DynamicMessageTest, PackedFields) {
   // Check that packed fields work properly.
-  google::protobuf::scoped_ptr<Message> message(packed_prototype_->New());
+  Arena arena;
+  Message* message = packed_prototype_->New(GetParam()? &arena : NULL);
   TestUtil::ReflectionTester reflection_tester(packed_descriptor_);
 
-  reflection_tester.SetPackedFieldsViaReflection(message.get());
+  reflection_tester.SetPackedFieldsViaReflection(message);
   reflection_tester.ExpectPackedFieldsSetViaReflection(*message);
+
+  if (!GetParam()) {
+    delete message;
+  }
 }
 
-TEST_F(DynamicMessageTest, Oneof) {
+TEST_P(DynamicMessageTest, Oneof) {
   // Check that oneof fields work properly.
-  google::protobuf::scoped_ptr<Message> message(oneof_prototype_->New());
+  Arena arena;
+  Message* message = oneof_prototype_->New(GetParam()? &arena : NULL);
 
   // Check default values.
   const Descriptor* descriptor = message->GetDescriptor();
@@ -226,29 +239,46 @@ TEST_F(DynamicMessageTest, Oneof) {
 
   // Check set functions.
   TestUtil::ReflectionTester reflection_tester(oneof_descriptor_);
-  reflection_tester.SetOneofViaReflection(message.get());
+  reflection_tester.SetOneofViaReflection(message);
   reflection_tester.ExpectOneofSetViaReflection(*message);
+
+  if (!GetParam()) {
+    delete message;
+  }
 }
 
-TEST_F(DynamicMessageTest, SpaceUsed) {
+TEST_P(DynamicMessageTest, SpaceUsed) {
   // Test that SpaceUsed() works properly
 
   // Since we share the implementation with generated messages, we don't need
   // to test very much here.  Just make sure it appears to be working.
 
-  google::protobuf::scoped_ptr<Message> message(prototype_->New());
+  Arena arena;
+  Message* message = prototype_->New(GetParam()? &arena : NULL);
   TestUtil::ReflectionTester reflection_tester(descriptor_);
 
   int initial_space_used = message->SpaceUsed();
 
-  reflection_tester.SetAllFieldsViaReflection(message.get());
+  reflection_tester.SetAllFieldsViaReflection(message);
   EXPECT_LT(initial_space_used, message->SpaceUsed());
+
+  if (!GetParam()) {
+    delete message;
+  }
 }
 
 TEST_F(DynamicMessageTest, Arena) {
   Arena arena;
   Message* message = prototype_->New(&arena);
-  (void)message;  // avoid unused-variable error.
+  Message* extension_message = extensions_prototype_->New(&arena);
+  Message* packed_message = packed_prototype_->New(&arena);
+  Message* oneof_message = oneof_prototype_->New(&arena);
+
+  // avoid unused-variable error.
+  (void)message;
+  (void)extension_message;
+  (void)packed_message;
+  (void)oneof_message;
   // Return without freeing: should not leak.
 }
 
@@ -286,6 +316,7 @@ TEST_F(DynamicMessageTest, Proto3) {
   delete message;
 }
 
+INSTANTIATE_TEST_CASE_P(UseArena, DynamicMessageTest, ::testing::Bool());
 
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/empty.pb.cc b/src/google/protobuf/empty.pb.cc
index 31cba097..9b53c546 100644
--- a/src/google/protobuf/empty.pb.cc
+++ b/src/google/protobuf/empty.pb.cc
@@ -1,93 +1,90 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/empty.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class EmptyDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Empty> {
+class EmptyDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Empty>
+      _instance;
 } _Empty_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fempty_2eproto {
+static void InitDefaultsEmpty() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Empty_default_instance_;
+    new (ptr) ::google::protobuf::Empty();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Empty::InitAsDefaultInstance();
+}
 
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Empty =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsEmpty}, {}};
 
-namespace {
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Empty.base);
+}
 
 ::google::protobuf::Metadata file_level_metadata[1];
 
-}  // namespace
-
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Empty, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Empty, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Empty)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Empty)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Empty_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Empty_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/empty.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/empty.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Empty_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _Empty_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\033google/protobuf/empty.proto\022\017google.pr"
       "otobuf\"\007\n\005EmptyBv\n\023com.google.protobufB\n"
       "EmptyProtoP\001Z\'github.com/golang/protobuf"
@@ -98,56 +95,52 @@ void AddDescriptorsImpl() {
       descriptor, 183);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/empty.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fempty_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void Empty::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 Empty::Empty()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fempty_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fempty_2eproto::scc_info_Empty.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Empty)
 }
 Empty::Empty(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fempty_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fempty_2eproto::scc_info_Empty.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Empty)
 }
 Empty::Empty(const Empty& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Empty)
 }
 
 void Empty::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 Empty::~Empty() {
@@ -156,11 +149,7 @@ Empty::~Empty() {
 }
 
 void Empty::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Empty::ArenaDtor(void* object) {
@@ -170,26 +159,26 @@ void Empty::ArenaDtor(void* object) {
 void Empty::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Empty::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Empty::descriptor() {
-  protobuf_google_2fprotobuf_2fempty_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fempty_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fempty_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fempty_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Empty& Empty::default_instance() {
-  protobuf_google_2fprotobuf_2fempty_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fempty_2eproto::scc_info_Empty.base);
   return *internal_default_instance();
 }
 
-Empty* Empty::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Empty>(arena);
-}
 
 void Empty::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Empty)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _internal_metadata_.Clear();
 }
 
 bool Empty::MergePartialFromCodedStream(
@@ -198,16 +187,15 @@ bool Empty::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Empty)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
   handle_unusual:
-    if (tag == 0 ||
-        ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-        ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+    if (tag == 0) {
       goto success;
     }
-    DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+    DO_(::google::protobuf::internal::WireFormat::SkipField(
+          input, tag, _internal_metadata_.mutable_unknown_fields()));
   }
 success:
   // @@protoc_insertion_point(parse_success:google.protobuf.Empty)
@@ -221,13 +209,27 @@ failure:
 void Empty::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Empty)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Empty)
 }
 
 ::google::protobuf::uint8* Empty::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Empty)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Empty)
   return target;
 }
@@ -236,10 +238,13 @@ size_t Empty::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Empty)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -262,6 +267,9 @@ void Empty::MergeFrom(const Empty& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Empty)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
 }
 
 void Empty::CopyFrom(const ::google::protobuf::Message& from) {
@@ -302,21 +310,24 @@ void Empty::UnsafeArenaSwap(Empty* other) {
   InternalSwap(other);
 }
 void Empty::InternalSwap(Empty* other) {
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Empty::GetMetadata() const {
   protobuf_google_2fprotobuf_2fempty_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fempty_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fempty_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Empty
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Empty* Arena::CreateMaybeMessage< ::google::protobuf::Empty >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Empty >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/empty.pb.h b/src/google/protobuf/empty.pb.h
index a75d6dd6..53857e5f 100644
--- a/src/google/protobuf/empty.pb.h
+++ b/src/google/protobuf/empty.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/empty.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fempty_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fempty_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fempty_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fempty_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fempty_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fempty_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fempty_2eproto
 namespace google {
 namespace protobuf {
 class Empty;
@@ -36,20 +52,13 @@ class EmptyDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern EmptyDefaultTypeInternal _Empty_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fempty_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fempty_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Empty* Arena::CreateMaybeMessage<::google::protobuf::Empty>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -64,53 +73,73 @@ class LIBPROTOBUF_EXPORT Empty : public ::google::protobuf::Message /* @@protoc_
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Empty(Empty&& from) noexcept
+    : Empty() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Empty& operator=(Empty&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Empty& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Empty* internal_default_instance() {
     return reinterpret_cast<const Empty*>(
                &_Empty_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void UnsafeArenaSwap(Empty* other);
   void Swap(Empty* other);
+  friend void swap(Empty& a, Empty& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Empty* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Empty* New() const final {
+    return CreateMaybeMessage<Empty>(NULL);
+  }
 
-  Empty* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Empty* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Empty>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Empty& from);
   void MergeFrom(const Empty& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Empty* other);
   protected:
   explicit Empty(::google::protobuf::Arena* arena);
@@ -126,7 +155,7 @@ class LIBPROTOBUF_EXPORT Empty : public ::google::protobuf::Message /* @@protoc_
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -136,28 +165,32 @@ class LIBPROTOBUF_EXPORT Empty : public ::google::protobuf::Message /* @@protoc_
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fempty_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fempty_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Empty
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fempty_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fempty_2eproto
diff --git a/src/google/protobuf/extension_set.cc b/src/google/protobuf/extension_set.cc
index 955c079b..b587b38f 100644
--- a/src/google/protobuf/extension_set.cc
+++ b/src/google/protobuf/extension_set.cc
@@ -33,6 +33,8 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #include <google/protobuf/stubs/hash.h>
+#include <tuple>
+#include <utility>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/once.h>
 #include <google/protobuf/extension_set.h>
@@ -178,20 +180,29 @@ void ExtensionSet::RegisterMessageExtension(const MessageLite* containing_type,
 // Constructors and basic methods.
 
 ExtensionSet::ExtensionSet(::google::protobuf::Arena* arena)
-    : arena_(arena) {
-  if (arena_ != NULL) {
-    arena_->OwnDestructor(&extensions_);
-  }
-}
-
-ExtensionSet::ExtensionSet() : arena_(NULL) {}
+    : arena_(arena),
+      flat_capacity_(0),
+      flat_size_(0),
+      map_{flat_capacity_ == 0 ? NULL
+                               : ::google::protobuf::Arena::CreateArray<KeyValue>(
+                                     arena_, flat_capacity_)} {}
+
+ExtensionSet::ExtensionSet()
+    : arena_(NULL),
+      flat_capacity_(0),
+      flat_size_(0),
+      map_{flat_capacity_ == 0 ? NULL
+                               : ::google::protobuf::Arena::CreateArray<KeyValue>(
+                                     arena_, flat_capacity_)} {}
 
 ExtensionSet::~ExtensionSet() {
   // Deletes all allocated extensions.
   if (arena_ == NULL) {
-    for (ExtensionMap::iterator iter = extensions_.begin();
-         iter != extensions_.end(); ++iter) {
-      iter->second.Free();
+    ForEach([](int /* number */, Extension& ext) { ext.Free(); });
+    if (GOOGLE_PREDICT_FALSE(is_large())) {
+      delete map_.large;
+    } else {
+      delete[] map_.flat;
     }
   }
 }
@@ -202,45 +213,43 @@ ExtensionSet::~ExtensionSet() {
 //                                 vector<const FieldDescriptor*>* output) const
 
 bool ExtensionSet::Has(int number) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) return false;
-  GOOGLE_DCHECK(!iter->second.is_repeated);
-  return !iter->second.is_cleared;
+  const Extension* ext = FindOrNull(number);
+  if (ext == NULL) return false;
+  GOOGLE_DCHECK(!ext->is_repeated);
+  return !ext->is_cleared;
 }
 
 int ExtensionSet::NumExtensions() const {
   int result = 0;
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    if (!iter->second.is_cleared) {
+  ForEach([&result](int /* number */, const Extension& ext) {
+    if (!ext.is_cleared) {
       ++result;
     }
-  }
+  });
   return result;
 }
 
 int ExtensionSet::ExtensionSize(int number) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) return false;
-  return iter->second.GetSize();
+  const Extension* ext = FindOrNull(number);
+  return ext == NULL ? 0 : ext->GetSize();
 }
 
 FieldType ExtensionSet::ExtensionType(int number) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) {
+  const Extension* ext = FindOrNull(number);
+  if (ext == NULL) {
     GOOGLE_LOG(DFATAL) << "Don't lookup extension types if they aren't present (1). ";
     return 0;
   }
-  if (iter->second.is_cleared) {
+  if (ext->is_cleared) {
     GOOGLE_LOG(DFATAL) << "Don't lookup extension types if they aren't present (2). ";
   }
-  return iter->second.type;
+  return ext->type;
 }
 
 void ExtensionSet::ClearExtension(int number) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) return;
-  iter->second.Clear();
+  Extension* ext = FindOrNull(number);
+  if (ext == NULL) return;
+  ext->Clear();
 }
 
 // ===================================================================
@@ -266,12 +275,12 @@ enum Cardinality {
                                                                                \
 LOWERCASE ExtensionSet::Get##CAMELCASE(int number,                             \
                                        LOWERCASE default_value) const {        \
-  ExtensionMap::const_iterator iter = extensions_.find(number);                \
-  if (iter == extensions_.end() || iter->second.is_cleared) {                  \
+  const Extension* extension = FindOrNull(number);                             \
+  if (extension == NULL || extension->is_cleared) {                            \
     return default_value;                                                      \
   } else {                                                                     \
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, UPPERCASE);                            \
-    return iter->second.LOWERCASE##_value;                                     \
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, UPPERCASE);                              \
+    return extension->LOWERCASE##_value;                                       \
   }                                                                            \
 }                                                                              \
                                                                                \
@@ -291,18 +300,18 @@ void ExtensionSet::Set##CAMELCASE(int number, FieldType type,                  \
 }                                                                              \
                                                                                \
 LOWERCASE ExtensionSet::GetRepeated##CAMELCASE(int number, int index) const {  \
-  ExtensionMap::const_iterator iter = extensions_.find(number);                \
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty)."; \
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, UPPERCASE);                              \
-  return iter->second.repeated_##LOWERCASE##_value->Get(index);                \
+  const Extension* extension = FindOrNull(number);                             \
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";         \
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, UPPERCASE);                                \
+  return extension->repeated_##LOWERCASE##_value->Get(index);                  \
 }                                                                              \
                                                                                \
 void ExtensionSet::SetRepeated##CAMELCASE(                                     \
     int number, int index, LOWERCASE value) {                                  \
-  ExtensionMap::iterator iter = extensions_.find(number);                      \
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty)."; \
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, UPPERCASE);                              \
-  iter->second.repeated_##LOWERCASE##_value->Set(index, value);                \
+  Extension* extension = FindOrNull(number);                                   \
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";         \
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, UPPERCASE);                                \
+  extension->repeated_##LOWERCASE##_value->Set(index, value);                  \
 }                                                                              \
                                                                                \
 void ExtensionSet::Add##CAMELCASE(int number, FieldType type,                  \
@@ -335,13 +344,13 @@ PRIMITIVE_ACCESSORS(  BOOL,   bool,   Bool)
 
 const void* ExtensionSet::GetRawRepeatedField(int number,
                                               const void* default_value) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) {
+  const Extension* extension = FindOrNull(number);
+  if (extension == NULL) {
     return default_value;
   }
   // We assume that all the RepeatedField<>* pointers have the same
   // size and alignment within the anonymous union in Extension.
-  return iter->second.repeated_int32_value;
+  return extension->repeated_int32_value;
 }
 
 void* ExtensionSet::MutableRawRepeatedField(int number, FieldType field_type,
@@ -392,7 +401,7 @@ void* ExtensionSet::MutableRawRepeatedField(int number, FieldType field_type,
         break;
       case WireFormatLite::CPPTYPE_STRING:
         extension->repeated_string_value =
-            Arena::CreateMessage<RepeatedPtrField< ::std::string> >(arena_);
+            Arena::CreateMessage<RepeatedPtrField<::std::string> >(arena_);
         break;
       case WireFormatLite::CPPTYPE_MESSAGE:
         extension->repeated_message_value =
@@ -409,11 +418,11 @@ void* ExtensionSet::MutableRawRepeatedField(int number, FieldType field_type,
 // Compatible version using old call signature. Does not create extensions when
 // the don't already exist; instead, just GOOGLE_CHECK-fails.
 void* ExtensionSet::MutableRawRepeatedField(int number) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter == extensions_.end()) << "Extension not found.";
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Extension not found.";
   // We assume that all the RepeatedField<>* pointers have the same
   // size and alignment within the anonymous union in Extension.
-  return iter->second.repeated_int32_value;
+  return extension->repeated_int32_value;
 }
 
 
@@ -421,13 +430,13 @@ void* ExtensionSet::MutableRawRepeatedField(int number) {
 // Enums
 
 int ExtensionSet::GetEnum(int number, int default_value) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end() || iter->second.is_cleared) {
+  const Extension* extension = FindOrNull(number);
+  if (extension == NULL || extension->is_cleared) {
     // Not present.  Return the default value.
     return default_value;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, ENUM);
-    return iter->second.enum_value;
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, ENUM);
+    return extension->enum_value;
   }
 }
 
@@ -446,17 +455,17 @@ void ExtensionSet::SetEnum(int number, FieldType type, int value,
 }
 
 int ExtensionSet::GetRepeatedEnum(int number, int index) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, ENUM);
-  return iter->second.repeated_enum_value->Get(index);
+  const Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, ENUM);
+  return extension->repeated_enum_value->Get(index);
 }
 
 void ExtensionSet::SetRepeatedEnum(int number, int index, int value) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, ENUM);
-  iter->second.repeated_enum_value->Set(index, value);
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, ENUM);
+  extension->repeated_enum_value->Set(index, value);
 }
 
 void ExtensionSet::AddEnum(int number, FieldType type,
@@ -482,13 +491,13 @@ void ExtensionSet::AddEnum(int number, FieldType type,
 
 const string& ExtensionSet::GetString(int number,
                                       const string& default_value) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end() || iter->second.is_cleared) {
+  const Extension* extension = FindOrNull(number);
+  if (extension == NULL || extension->is_cleared) {
     // Not present.  Return the default value.
     return default_value;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, STRING);
-    return *iter->second.string_value;
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, STRING);
+    return *extension->string_value;
   }
 }
 
@@ -508,17 +517,17 @@ string* ExtensionSet::MutableString(int number, FieldType type,
 }
 
 const string& ExtensionSet::GetRepeatedString(int number, int index) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, STRING);
-  return iter->second.repeated_string_value->Get(index);
+  const Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, STRING);
+  return extension->repeated_string_value->Get(index);
 }
 
 string* ExtensionSet::MutableRepeatedString(int number, int index) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, STRING);
-  return iter->second.repeated_string_value->Mutable(index);
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, STRING);
+  return extension->repeated_string_value->Mutable(index);
 }
 
 string* ExtensionSet::AddString(int number, FieldType type,
@@ -542,16 +551,16 @@ string* ExtensionSet::AddString(int number, FieldType type,
 
 const MessageLite& ExtensionSet::GetMessage(
     int number, const MessageLite& default_value) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) {
+  const Extension* extension = FindOrNull(number);
+  if (extension == NULL) {
     // Not present.  Return the default value.
     return default_value;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
-    if (iter->second.is_lazy) {
-      return iter->second.lazymessage_value->GetMessage(default_value);
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
+    if (extension->is_lazy) {
+      return extension->lazymessage_value->GetMessage(default_value);
     } else {
-      return *iter->second.message_value;
+      return *extension->message_value;
     }
   }
 }
@@ -662,55 +671,53 @@ void ExtensionSet::UnsafeArenaSetAllocatedMessage(
   extension->is_cleared = false;
 }
 
-
 MessageLite* ExtensionSet::ReleaseMessage(int number,
                                           const MessageLite& prototype) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) {
+  Extension* extension = FindOrNull(number);
+  if (extension == NULL) {
     // Not present.  Return NULL.
     return NULL;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
     MessageLite* ret = NULL;
-    if (iter->second.is_lazy) {
-      ret = iter->second.lazymessage_value->ReleaseMessage(prototype);
+    if (extension->is_lazy) {
+      ret = extension->lazymessage_value->ReleaseMessage(prototype);
       if (arena_ == NULL) {
-        delete iter->second.lazymessage_value;
+        delete extension->lazymessage_value;
       }
     } else {
       if (arena_ == NULL) {
-        ret = iter->second.message_value;
+        ret = extension->message_value;
       } else {
         // ReleaseMessage() always returns a heap-allocated message, and we are
         // on an arena, so we need to make a copy of this message to return.
-        ret = (iter->second.message_value)->New();
-        ret->CheckTypeAndMergeFrom(*iter->second.message_value);
+        ret = extension->message_value->New();
+        ret->CheckTypeAndMergeFrom(*extension->message_value);
       }
     }
-    extensions_.erase(number);
+    Erase(number);
     return ret;
   }
 }
 
 MessageLite* ExtensionSet::UnsafeArenaReleaseMessage(
     int number, const MessageLite& prototype) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  if (iter == extensions_.end()) {
+  Extension* extension = FindOrNull(number);
+  if (extension == NULL) {
     // Not present.  Return NULL.
     return NULL;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
     MessageLite* ret = NULL;
-    if (iter->second.is_lazy) {
-      ret =
-        iter->second.lazymessage_value->UnsafeArenaReleaseMessage(prototype);
+    if (extension->is_lazy) {
+      ret = extension->lazymessage_value->UnsafeArenaReleaseMessage(prototype);
       if (arena_ == NULL) {
-        delete iter->second.lazymessage_value;
+        delete extension->lazymessage_value;
       }
     } else {
-      ret = iter->second.message_value;
+      ret = extension->message_value;
     }
-    extensions_.erase(number);
+    Erase(number);
     return ret;
   }
 }
@@ -721,17 +728,17 @@ MessageLite* ExtensionSet::UnsafeArenaReleaseMessage(
 
 const MessageLite& ExtensionSet::GetRepeatedMessage(
     int number, int index) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, MESSAGE);
-  return iter->second.repeated_message_value->Get(index);
+  const Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, MESSAGE);
+  return extension->repeated_message_value->Get(index);
 }
 
 MessageLite* ExtensionSet::MutableRepeatedMessage(int number, int index) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-  GOOGLE_DCHECK_TYPE(iter->second, REPEATED, MESSAGE);
-  return iter->second.repeated_message_value->Mutable(index);
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
+  GOOGLE_DCHECK_TYPE(*extension, REPEATED, MESSAGE);
+  return extension->repeated_message_value->Mutable(index);
 }
 
 MessageLite* ExtensionSet::AddMessage(int number, FieldType type,
@@ -750,8 +757,10 @@ MessageLite* ExtensionSet::AddMessage(int number, FieldType type,
 
   // RepeatedPtrField<MessageLite> does not know how to Add() since it cannot
   // allocate an abstract object, so we have to be tricky.
-  MessageLite* result = extension->repeated_message_value
-      ->AddFromCleared<GenericTypeHandler<MessageLite> >();
+  MessageLite* result =
+      reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+          extension->repeated_message_value)
+          ->AddFromCleared<GenericTypeHandler<MessageLite> >();
   if (result == NULL) {
     result = prototype.New(arena_);
     extension->repeated_message_value->AddAllocated(result);
@@ -767,10 +776,8 @@ MessageLite* ExtensionSet::AddMessage(int number, FieldType type,
 #undef GOOGLE_DCHECK_TYPE
 
 void ExtensionSet::RemoveLast(int number) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-
-  Extension* extension = &iter->second;
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
   GOOGLE_DCHECK(extension->is_repeated);
 
   switch(cpp_type(extension->type)) {
@@ -808,20 +815,16 @@ void ExtensionSet::RemoveLast(int number) {
 }
 
 MessageLite* ExtensionSet::ReleaseLast(int number) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-
-  Extension* extension = &iter->second;
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
   GOOGLE_DCHECK(extension->is_repeated);
   GOOGLE_DCHECK(cpp_type(extension->type) == WireFormatLite::CPPTYPE_MESSAGE);
   return extension->repeated_message_value->ReleaseLast();
 }
 
 void ExtensionSet::SwapElements(int number, int index1, int index2) {
-  ExtensionMap::iterator iter = extensions_.find(number);
-  GOOGLE_CHECK(iter != extensions_.end()) << "Index out-of-bounds (field is empty).";
-
-  Extension* extension = &iter->second;
+  Extension* extension = FindOrNull(number);
+  GOOGLE_CHECK(extension != NULL) << "Index out-of-bounds (field is empty).";
   GOOGLE_DCHECK(extension->is_repeated);
 
   switch(cpp_type(extension->type)) {
@@ -861,18 +864,45 @@ void ExtensionSet::SwapElements(int number, int index1, int index2) {
 // ===================================================================
 
 void ExtensionSet::Clear() {
-  for (ExtensionMap::iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    iter->second.Clear();
+  ForEach([](int /* number */, Extension& ext) { ext.Clear(); });
+}
+
+namespace {
+// Computes the size of a std::set_union without constructing the union.
+template <typename ItX, typename ItY>
+size_t SizeOfUnion(ItX it_xs, ItX end_xs, ItY it_ys, ItY end_ys) {
+  size_t result = 0;
+  while (it_xs != end_xs && it_ys != end_ys) {
+    ++result;
+    if (it_xs->first < it_ys->first) {
+      ++it_xs;
+    } else if (it_xs->first == it_ys->first) {
+      ++it_xs;
+      ++it_ys;
+    } else {
+      ++it_ys;
+    }
   }
+  result += std::distance(it_xs, end_xs);
+  result += std::distance(it_ys, end_ys);
+  return result;
 }
+}  // namespace
 
 void ExtensionSet::MergeFrom(const ExtensionSet& other) {
-  for (ExtensionMap::const_iterator iter = other.extensions_.begin();
-       iter != other.extensions_.end(); ++iter) {
-    const Extension& other_extension = iter->second;
-    InternalExtensionMergeFrom(iter->first, other_extension);
+  if (GOOGLE_PREDICT_TRUE(!is_large())) {
+    if (GOOGLE_PREDICT_TRUE(!other.is_large())) {
+      GrowCapacity(SizeOfUnion(flat_begin(), flat_end(), other.flat_begin(),
+                               other.flat_end()));
+    } else {
+      GrowCapacity(SizeOfUnion(flat_begin(), flat_end(),
+                               other.map_.large->begin(),
+                               other.map_.large->end()));
+    }
   }
+  other.ForEach([this](int number, const Extension& ext) {
+    this->InternalExtensionMergeFrom(number, ext);
+  });
 }
 
 void ExtensionSet::InternalExtensionMergeFrom(
@@ -925,8 +955,10 @@ void ExtensionSet::InternalExtensionMergeFrom(
             other_extension.repeated_message_value;
         for (int i = 0; i < other_repeated_message->size(); i++) {
           const MessageLite& other_message = other_repeated_message->Get(i);
-          MessageLite* target = extension->repeated_message_value
-                   ->AddFromCleared<GenericTypeHandler<MessageLite> >();
+          MessageLite* target =
+              reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+                  extension->repeated_message_value)
+                  ->AddFromCleared<GenericTypeHandler<MessageLite> >();
           if (target == NULL) {
             target = other_message.New(arena_);
             extension->repeated_message_value->AddAllocated(target);
@@ -1015,7 +1047,10 @@ void ExtensionSet::InternalExtensionMergeFrom(
 
 void ExtensionSet::Swap(ExtensionSet* x) {
   if (GetArenaNoVirtual() == x->GetArenaNoVirtual()) {
-    extensions_.swap(x->extensions_);
+    using std::swap;
+    swap(flat_capacity_, x->flat_capacity_);
+    swap(flat_size_, x->flat_size_);
+    swap(map_, x->map_);
   } else {
     // TODO(cfallin, rohananil): We maybe able to optimize a case where we are
     // swapping from heap to arena-allocated extension set, by just Own()'ing
@@ -1032,19 +1067,17 @@ void ExtensionSet::Swap(ExtensionSet* x) {
 void ExtensionSet::SwapExtension(ExtensionSet* other,
                                  int number) {
   if (this == other) return;
-  ExtensionMap::iterator this_iter = extensions_.find(number);
-  ExtensionMap::iterator other_iter = other->extensions_.find(number);
+  Extension* this_ext = FindOrNull(number);
+  Extension* other_ext = other->FindOrNull(number);
 
-  if (this_iter == extensions_.end() &&
-      other_iter == other->extensions_.end()) {
+  if (this_ext == NULL && other_ext == NULL) {
     return;
   }
 
-  if (this_iter != extensions_.end() &&
-      other_iter != other->extensions_.end()) {
+  if (this_ext != NULL && other_ext != NULL) {
     if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
       using std::swap;
-      swap(this_iter->second, other_iter->second);
+      swap(*this_ext, *other_ext);
     } else {
       // TODO(cfallin, rohananil): We could further optimize these cases,
       // especially avoid creation of ExtensionSet, and move MergeFrom logic
@@ -1052,33 +1085,33 @@ void ExtensionSet::SwapExtension(ExtensionSet* other,
       // We do it this way to reuse the copy-across-arenas logic already
       // implemented in ExtensionSet's MergeFrom.
       ExtensionSet temp;
-      temp.InternalExtensionMergeFrom(number, other_iter->second);
-      ExtensionMap::iterator temp_iter = temp.extensions_.find(number);
-      other_iter->second.Clear();
-      other->InternalExtensionMergeFrom(number, this_iter->second);
-      this_iter->second.Clear();
-      InternalExtensionMergeFrom(number, temp_iter->second);
+      temp.InternalExtensionMergeFrom(number, *other_ext);
+      Extension* temp_ext = temp.FindOrNull(number);
+      other_ext->Clear();
+      other->InternalExtensionMergeFrom(number, *this_ext);
+      this_ext->Clear();
+      InternalExtensionMergeFrom(number, *temp_ext);
     }
     return;
   }
 
-  if (this_iter == extensions_.end()) {
+  if (this_ext == NULL) {
     if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
-      extensions_.insert(std::make_pair(number, other_iter->second));
+      *Insert(number).first = *other_ext;
     } else {
-      InternalExtensionMergeFrom(number, other_iter->second);
+      InternalExtensionMergeFrom(number, *other_ext);
     }
-    other->extensions_.erase(number);
+    other->Erase(number);
     return;
   }
 
-  if (other_iter == other->extensions_.end()) {
+  if (other_ext == NULL) {
     if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
-      other->extensions_.insert(std::make_pair(number, this_iter->second));
+      *other->Insert(number).first = *this_ext;
     } else {
-      other->InternalExtensionMergeFrom(number, this_iter->second);
+      other->InternalExtensionMergeFrom(number, *this_ext);
     }
-    extensions_.erase(number);
+    Erase(number);
     return;
   }
 }
@@ -1086,28 +1119,15 @@ void ExtensionSet::SwapExtension(ExtensionSet* other,
 bool ExtensionSet::IsInitialized() const {
   // Extensions are never required.  However, we need to check that all
   // embedded messages are initialized.
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    const Extension& extension = iter->second;
-    if (cpp_type(extension.type) == WireFormatLite::CPPTYPE_MESSAGE) {
-      if (extension.is_repeated) {
-        for (int i = 0; i < extension.repeated_message_value->size(); i++) {
-          if (!extension.repeated_message_value->Get(i).IsInitialized()) {
-            return false;
-          }
-        }
-      } else {
-        if (!extension.is_cleared) {
-          if (extension.is_lazy) {
-            if (!extension.lazymessage_value->IsInitialized()) return false;
-          } else {
-            if (!extension.message_value->IsInitialized()) return false;
-          }
-        }
-      }
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    for (const auto& kv : *map_.large) {
+      if (!kv.second.IsInitialized()) return false;
     }
+    return true;
+  }
+  for (const KeyValue* it = flat_begin(); it != flat_end(); ++it) {
+    if (!it->second.IsInitialized()) return false;
   }
-
   return true;
 }
 
@@ -1346,22 +1366,27 @@ bool ExtensionSet::ParseField(uint32 tag, io::CodedInputStream* input,
 void ExtensionSet::SerializeWithCachedSizes(
     int start_field_number, int end_field_number,
     io::CodedOutputStream* output) const {
-  ExtensionMap::const_iterator iter;
-  for (iter = extensions_.lower_bound(start_field_number);
-       iter != extensions_.end() && iter->first < end_field_number;
-       ++iter) {
-    iter->second.SerializeFieldWithCachedSizes(iter->first, output);
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    const auto& end = map_.large->end();
+    for (auto it = map_.large->lower_bound(start_field_number);
+         it != end && it->first < end_field_number; ++it) {
+      it->second.SerializeFieldWithCachedSizes(it->first, output);
+    }
+    return;
+  }
+  const KeyValue* end = flat_end();
+  for (const KeyValue* it = std::lower_bound(
+           flat_begin(), end, start_field_number, KeyValue::FirstComparator());
+       it != end && it->first < end_field_number; ++it) {
+    it->second.SerializeFieldWithCachedSizes(it->first, output);
   }
 }
 
 size_t ExtensionSet::ByteSize() const {
   size_t total_size = 0;
-
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    total_size += iter->second.ByteSize(iter->first);
-  }
-
+  ForEach([&total_size](int number, const Extension& ext) {
+    total_size += ext.ByteSize(number);
+  });
   return total_size;
 }
 
@@ -1371,11 +1396,10 @@ size_t ExtensionSet::ByteSize() const {
 bool ExtensionSet::MaybeNewExtension(int number,
                                      const FieldDescriptor* descriptor,
                                      Extension** result) {
-  std::pair<ExtensionMap::iterator, bool> insert_result =
-      extensions_.insert(std::make_pair(number, Extension()));
-  *result = &insert_result.first->second;
+  bool extension_is_new = false;
+  std::tie(*result, extension_is_new) = Insert(number);
   (*result)->descriptor = descriptor;
-  return insert_result.second;
+  return extension_is_new;
 }
 
 // ===================================================================
@@ -1747,6 +1771,143 @@ void ExtensionSet::Extension::Free() {
 // Defined in extension_set_heavy.cc.
 // int ExtensionSet::Extension::SpaceUsedExcludingSelf() const
 
+bool ExtensionSet::Extension::IsInitialized() const {
+  if (cpp_type(type) == WireFormatLite::CPPTYPE_MESSAGE) {
+    if (is_repeated) {
+      for (int i = 0; i < repeated_message_value->size(); i++) {
+        if (!repeated_message_value->Get(i).IsInitialized()) {
+          return false;
+        }
+      }
+    } else {
+      if (!is_cleared) {
+        if (is_lazy) {
+          if (!lazymessage_value->IsInitialized()) return false;
+        } else {
+          if (!message_value->IsInitialized()) return false;
+        }
+      }
+    }
+  }
+  return true;
+}
+
+// Dummy key method to avoid weak vtable.
+void ExtensionSet::LazyMessageExtension::UnusedKeyMethod() {}
+
+const ExtensionSet::Extension* ExtensionSet::FindOrNull(int key) const {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    return FindOrNullInLargeMap(key);
+  }
+  const KeyValue* end = flat_end();
+  const KeyValue* it =
+      std::lower_bound(flat_begin(), end, key, KeyValue::FirstComparator());
+  if (it != end && it->first == key) {
+    return &it->second;
+  }
+  return NULL;
+}
+
+const ExtensionSet::Extension* ExtensionSet::FindOrNullInLargeMap(
+    int key) const {
+  assert(is_large());
+  LargeMap::const_iterator it = map_.large->find(key);
+  if (it != map_.large->end()) {
+    return &it->second;
+  }
+  return NULL;
+}
+
+ExtensionSet::Extension* ExtensionSet::FindOrNull(int key) {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    return FindOrNullInLargeMap(key);
+  }
+  KeyValue* end = flat_end();
+  KeyValue* it =
+      std::lower_bound(flat_begin(), end, key, KeyValue::FirstComparator());
+  if (it != end && it->first == key) {
+    return &it->second;
+  }
+  return NULL;
+}
+
+ExtensionSet::Extension* ExtensionSet::FindOrNullInLargeMap(int key) {
+  assert(is_large());
+  LargeMap::iterator it = map_.large->find(key);
+  if (it != map_.large->end()) {
+    return &it->second;
+  }
+  return NULL;
+}
+
+std::pair<ExtensionSet::Extension*, bool> ExtensionSet::Insert(int key) {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    auto maybe = map_.large->insert({key, Extension()});
+    return {&maybe.first->second, maybe.second};
+  }
+  KeyValue* end = flat_end();
+  KeyValue* it =
+      std::lower_bound(flat_begin(), end, key, KeyValue::FirstComparator());
+  if (it != end && it->first == key) {
+    return {&it->second, false};
+  }
+  if (flat_size_ < flat_capacity_) {
+    std::copy_backward(it, end, end + 1);
+    ++flat_size_;
+    it->first = key;
+    it->second = Extension();
+    return {&it->second, true};
+  }
+  GrowCapacity(flat_size_ + 1);
+  return Insert(key);
+}
+
+void ExtensionSet::GrowCapacity(size_t minimum_new_capacity) {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    return;  // LargeMap does not have a "reserve" method.
+  }
+  if (flat_capacity_ >= minimum_new_capacity) {
+    return;
+  }
+
+  do {
+    flat_capacity_ = flat_capacity_ == 0 ? 1 : flat_capacity_ * 4;
+  } while (flat_capacity_ < minimum_new_capacity);
+
+  const KeyValue* begin = flat_begin();
+  const KeyValue* end = flat_end();
+  if (flat_capacity_ > kMaximumFlatCapacity) {
+    // Switch to LargeMap
+    map_.large = ::google::protobuf::Arena::Create<LargeMap>(arena_);
+    LargeMap::iterator hint = map_.large->begin();
+    for (const KeyValue* it = begin; it != end; ++it) {
+      hint = map_.large->insert(hint, {it->first, it->second});
+    }
+    flat_size_ = 0;
+  } else {
+    map_.flat = ::google::protobuf::Arena::CreateArray<KeyValue>(arena_, flat_capacity_);
+    std::copy(begin, end, map_.flat);
+  }
+  if (arena_ == NULL) delete[] begin;
+}
+
+// static
+constexpr uint16 ExtensionSet::kMaximumFlatCapacity;
+
+void ExtensionSet::Erase(int key) {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    map_.large->erase(key);
+    return;
+  }
+  KeyValue* end = flat_end();
+  KeyValue* it =
+      std::lower_bound(flat_begin(), end, key, KeyValue::FirstComparator());
+  if (it != end && it->first == key) {
+    std::copy(it + 1, end, it);
+    --flat_size_;
+  }
+}
+
 // ==================================================================
 // Default repeated field instances for iterator-compatible accessors
 
diff --git a/src/google/protobuf/extension_set.h b/src/google/protobuf/extension_set.h
index f5aa8de9..c4796629 100644
--- a/src/google/protobuf/extension_set.h
+++ b/src/google/protobuf/extension_set.h
@@ -38,16 +38,16 @@
 #ifndef GOOGLE_PROTOBUF_EXTENSION_SET_H__
 #define GOOGLE_PROTOBUF_EXTENSION_SET_H__
 
-#include <vector>
+#include <algorithm>
+#include <cassert>
 #include <map>
-#include <utility>
 #include <string>
-
+#include <utility>
+#include <vector>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/once.h>
-
 #include <google/protobuf/repeated_field.h>
 
 namespace google {
@@ -416,7 +416,8 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
                                                            uint8* target) const;
 
   // For backward-compatibility, versions of two of the above methods that
-  // are never forced to serialize deterministically.
+  // serialize deterministically iff SetDefaultSerializationDeterministic()
+  // has been called.
   uint8* SerializeWithCachedSizesToArray(int start_field_number,
                                          int end_field_number,
                                          uint8* target) const;
@@ -435,6 +436,13 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
   // be linked in).  It's up to the protocol compiler to avoid calling this on
   // such ExtensionSets (easy enough since lite messages don't implement
   // SpaceUsed()).
+  size_t SpaceUsedExcludingSelfLong() const;
+
+  // This method just calls SpaceUsedExcludingSelfLong() but it can not be
+  // inlined because the definition of SpaceUsedExcludingSelfLong() is not
+  // included in lite runtime and when an inline method refers to it MSVC
+  // will complain about unresolved symbols when building the lite runtime
+  // as .dll.
   int SpaceUsedExcludingSelf() const;
 
  private:
@@ -456,8 +464,13 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
         const MessageLite& prototype) = 0;
 
     virtual bool IsInitialized() const = 0;
-    virtual int ByteSize() const = 0;
-    virtual int SpaceUsed() const = 0;
+
+    PROTOBUF_RUNTIME_DEPRECATED("Please use ByteSizeLong() instead")
+    virtual int ByteSize() const {
+      return internal::ToIntSize(ByteSizeLong());
+    }
+    virtual size_t ByteSizeLong() const = 0;
+    virtual size_t SpaceUsedLong() const = 0;
 
     virtual void MergeFrom(const LazyMessageExtension& other) = 0;
     virtual void Clear() = 0;
@@ -475,6 +488,8 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
     }
 
    private:
+    virtual void UnusedKeyMethod();  // Dummy key method to avoid weak vtable.
+
     GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(LazyMessageExtension);
   };
   struct Extension {
@@ -556,10 +571,90 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
     void Clear();
     int GetSize() const;
     void Free();
-    int SpaceUsedExcludingSelf() const;
+    size_t SpaceUsedExcludingSelfLong() const;
+    bool IsInitialized() const;
+  };
+
+  // The Extension struct is small enough to be passed by value, so we use it
+  // directly as the value type in mappings rather than use pointers.  We use
+  // sorted maps rather than hash-maps because we expect most ExtensionSets will
+  // only contain a small number of extension.  Also, we want AppendToList and
+  // deterministic serialization to order fields by field number.
+
+  struct KeyValue {
+    int first;
+    Extension second;
+
+    struct FirstComparator {
+      bool operator()(const KeyValue& lhs, const KeyValue& rhs) const {
+        return lhs.first < rhs.first;
+      }
+      bool operator()(const KeyValue& lhs, int key) const {
+        return lhs.first < key;
+      }
+      bool operator()(int key, const KeyValue& rhs) const {
+        return key < rhs.first;
+      }
+    };
   };
-  typedef std::map<int, Extension> ExtensionMap;
 
+  typedef std::map<int, Extension> LargeMap;
+
+  // Wrapper API that switches between flat-map and LargeMap.
+
+  // Finds a key (if present) in the ExtensionSet.
+  const Extension* FindOrNull(int key) const;
+  Extension* FindOrNull(int key);
+
+  // Helper-functions that only inspect the LargeMap.
+  const Extension* FindOrNullInLargeMap(int key) const;
+  Extension* FindOrNullInLargeMap(int key);
+
+  // Inserts a new (key, Extension) into the ExtensionSet (and returns true), or
+  // finds the already-existing Extension for that key (returns false).
+  // The Extension* will point to the new-or-found Extension.
+  std::pair<Extension*, bool> Insert(int key);
+
+  // Grows the flat_capacity_.
+  // If flat_capacity_ > kMaximumFlatCapacity, converts to LargeMap.
+  void GrowCapacity(size_t minimum_new_capacity);
+  static constexpr uint16 kMaximumFlatCapacity = 256;
+  bool is_large() const { return flat_capacity_ > kMaximumFlatCapacity; }
+
+  // Removes a key from the ExtensionSet.
+  void Erase(int key);
+
+  size_t Size() const {
+    return GOOGLE_PREDICT_FALSE(is_large()) ? map_.large->size() : flat_size_;
+  }
+
+  // Similar to std::for_each.
+  // Each Iterator is decomposed into ->first and ->second fields, so
+  // that the KeyValueFunctor can be agnostic vis-a-vis KeyValue-vs-std::pair.
+  template <typename Iterator, typename KeyValueFunctor>
+  static KeyValueFunctor ForEach(Iterator begin, Iterator end,
+                                 KeyValueFunctor func) {
+    for (Iterator it = begin; it != end; ++it) func(it->first, it->second);
+    return std::move(func);
+  }
+
+  // Applies a functor to the <int, Extension&> pairs in sorted order.
+  template <typename KeyValueFunctor>
+  KeyValueFunctor ForEach(KeyValueFunctor func) {
+    if (GOOGLE_PREDICT_FALSE(is_large())) {
+      return ForEach(map_.large->begin(), map_.large->end(), std::move(func));
+    }
+    return ForEach(flat_begin(), flat_end(), std::move(func));
+  }
+
+  // Applies a functor to the <int, const Extension&> pairs in sorted order.
+  template <typename KeyValueFunctor>
+  KeyValueFunctor ForEach(KeyValueFunctor func) const {
+    if (GOOGLE_PREDICT_FALSE(is_large())) {
+      return ForEach(map_.large->begin(), map_.large->end(), std::move(func));
+    }
+    return ForEach(flat_begin(), flat_end(), std::move(func));
+  }
 
   // Merges existing Extension from other_extension
   void InternalExtensionMergeFrom(int number, const Extension& other_extension);
@@ -620,17 +715,41 @@ class LIBPROTOBUF_EXPORT ExtensionSet {
   //   class.
 
   // Defined in extension_set_heavy.cc.
-  static inline int RepeatedMessage_SpaceUsedExcludingSelf(
+  static inline size_t RepeatedMessage_SpaceUsedExcludingSelfLong(
       RepeatedPtrFieldBase* field);
 
-  // The Extension struct is small enough to be passed by value, so we use it
-  // directly as the value type in the map rather than use pointers.  We use
-  // a map rather than hash_map here because we expect most ExtensionSets will
-  // only contain a small number of extensions whereas hash_map is optimized
-  // for 100 elements or more.  Also, we want AppendToList() to order fields
-  // by field number.
-  ExtensionMap extensions_;
+  KeyValue* flat_begin() {
+    assert(!is_large());
+    return map_.flat;
+  }
+  const KeyValue* flat_begin() const {
+    assert(!is_large());
+    return map_.flat;
+  }
+  KeyValue* flat_end() {
+    assert(!is_large());
+    return map_.flat + flat_size_;
+  }
+  const KeyValue* flat_end() const {
+    assert(!is_large());
+    return map_.flat + flat_size_;
+  }
+
   ::google::protobuf::Arena* arena_;
+
+  // Manual memory-management:
+  // map_.flat is an allocated array of flat_capacity_ elements.
+  // [map_.flat, map_.flat + flat_size_) is the currently-in-use prefix.
+  uint16 flat_capacity_;
+  uint16 flat_size_;
+  union AllocatedData {
+    KeyValue* flat;
+
+    // If flat_capacity_ > kMaximumFlatCapacity, switch to LargeMap,
+    // which guarantees O(n lg n) CPU but larger constant factors.
+    LargeMap* large;
+  } map_;
+
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ExtensionSet);
 };
 
@@ -689,6 +808,10 @@ inline void ExtensionSet::AddString(int number, FieldType type,
 //                                       ExtensionSet* set);
 //     static inline void Add(int number, ConstType value, ExtensionSet* set);
 //     static inline MutableType Add(int number, ExtensionSet* set);
+//     This is used by the ExtensionIdentifier constructor to register
+//     the extension at dynamic initialization.
+//     template <typename ExtendeeT>
+//     static void Register(int number, FieldType type, bool is_packed);
 //   };
 //
 // Not all of these methods make sense for all field types.  For example, the
@@ -720,6 +843,11 @@ class PrimitiveTypeTraits {
                               ConstType default_value);
   static inline void Set(int number, FieldType field_type,
                          ConstType value, ExtensionSet* set);
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterExtension(&ExtendeeT::default_instance(), number,
+                                    type, false, is_packed);
+  }
 };
 
 template <typename Type>
@@ -743,6 +871,11 @@ class RepeatedPrimitiveTypeTraits {
                       bool is_packed, ExtensionSet* set);
 
   static const RepeatedFieldType* GetDefaultRepeatedField();
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterExtension(&ExtendeeT::default_instance(), number,
+                                    type, true, is_packed);
+  }
 };
 
 LIBPROTOBUF_EXPORT extern ProtobufOnceType repeated_primitive_generic_type_traits_once_init_;
@@ -840,6 +973,11 @@ class LIBPROTOBUF_EXPORT StringTypeTraits {
                                 ExtensionSet* set) {
     return set->MutableString(number, field_type, NULL);
   }
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterExtension(&ExtendeeT::default_instance(), number,
+                                    type, false, is_packed);
+  }
 };
 
 LIBPROTOBUF_EXPORT extern ProtobufOnceType repeated_string_type_traits_once_init_;
@@ -892,6 +1030,12 @@ class LIBPROTOBUF_EXPORT RepeatedStringTypeTraits {
     return default_repeated_field_;
   }
 
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterExtension(&ExtendeeT::default_instance(), number,
+                                    type, true, is_packed);
+  }
+
  private:
   static void InitializeDefaultRepeatedFields();
   static void DestroyDefaultRepeatedFields();
@@ -919,6 +1063,11 @@ class EnumTypeTraits {
     GOOGLE_DCHECK(IsValid(value));
     set->SetEnum(number, field_type, value, NULL);
   }
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterEnumExtension(&ExtendeeT::default_instance(), number,
+                                        type, false, is_packed, IsValid);
+  }
 };
 
 template <typename Type, bool IsValid(int)>
@@ -972,6 +1121,11 @@ class RepeatedEnumTypeTraits {
     return reinterpret_cast<const RepeatedField<Type>*>(
         RepeatedPrimitiveTypeTraits<int32>::GetDefaultRepeatedField());
   }
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterEnumExtension(&ExtendeeT::default_instance(), number,
+                                        type, true, is_packed, IsValid);
+  }
 };
 
 // -------------------------------------------------------------------
@@ -1017,6 +1171,12 @@ class MessageTypeTraits {
     return static_cast<Type*>(set->UnsafeArenaReleaseMessage(
         number, Type::default_instance()));
   }
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterMessageExtension(&ExtendeeT::default_instance(),
+                                           number, type, false, is_packed,
+                                           &Type::default_instance());
+  }
 };
 
 // forward declaration
@@ -1062,6 +1222,12 @@ class RepeatedMessageTypeTraits {
   }
 
   static const RepeatedFieldType* GetDefaultRepeatedField();
+  template <typename ExtendeeT>
+  static void Register(int number, FieldType type, bool is_packed) {
+    ExtensionSet::RegisterMessageExtension(&ExtendeeT::default_instance(),
+                                           number, type, true, is_packed,
+                                           &Type::default_instance());
+  }
 };
 
 LIBPROTOBUF_EXPORT extern ProtobufOnceType repeated_message_generic_type_traits_once_init_;
@@ -1070,7 +1236,7 @@ LIBPROTOBUF_EXPORT extern ProtobufOnceType repeated_message_generic_type_traits_
 // message-type repeated field extensions.
 class LIBPROTOBUF_EXPORT RepeatedMessageGenericTypeTraits {
  public:
-  typedef RepeatedPtrField< ::google::protobuf::MessageLite*> RepeatedFieldType;
+  typedef RepeatedPtrField<::google::protobuf::MessageLite*> RepeatedFieldType;
  private:
   template<typename Type> friend class RepeatedMessageTypeTraits;
   static void InitializeDefaultRepeatedFields();
@@ -1100,7 +1266,7 @@ template<typename Type> inline
 // parameter, and thus make an instance of ExtensionIdentifier have no
 // actual contents.  However, if we did that, then using at extension
 // identifier would not necessarily cause the compiler to output any sort
-// of reference to any simple defined in the extension's .pb.o file.  Some
+// of reference to any symbol defined in the extension's .pb.o file.  Some
 // linkers will actually drop object files that are not explicitly referenced,
 // but that would be bad because it would cause this extension to not be
 // registered at static initialization, and therefore using it would crash.
@@ -1113,12 +1279,18 @@ class ExtensionIdentifier {
   typedef ExtendeeType Extendee;
 
   ExtensionIdentifier(int number, typename TypeTraits::ConstType default_value)
-      : number_(number), default_value_(default_value) {}
+      : number_(number), default_value_(default_value) {
+    Register(number);
+  }
   inline int number() const { return number_; }
   typename TypeTraits::ConstType default_value() const {
     return default_value_;
   }
 
+  static void Register(int number) {
+    TypeTraits::template Register<ExtendeeType>(number, field_type, is_packed);
+  }
+
  private:
   const int number_;
   typename TypeTraits::ConstType default_value_;
diff --git a/src/google/protobuf/extension_set_heavy.cc b/src/google/protobuf/extension_set_heavy.cc
index 8f8f180a..a3c84167 100644
--- a/src/google/protobuf/extension_set_heavy.cc
+++ b/src/google/protobuf/extension_set_heavy.cc
@@ -35,12 +35,15 @@
 // Contains methods defined in extension_set.h which cannot be part of the
 // lite library because they use descriptors or reflection.
 
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl_lite.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/extension_set.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>
+#include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/wire_format.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 
@@ -93,16 +96,14 @@ class DescriptorPoolExtensionFinder : public ExtensionFinder {
 };
 
 void ExtensionSet::AppendToList(
-    const Descriptor* containing_type,
-    const DescriptorPool* pool,
+    const Descriptor* containing_type, const DescriptorPool* pool,
     std::vector<const FieldDescriptor*>* output) const {
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
+  ForEach([containing_type, pool, &output](int number, const Extension& ext) {
     bool has = false;
-    if (iter->second.is_repeated) {
-      has = iter->second.GetSize() > 0;
+    if (ext.is_repeated) {
+      has = ext.GetSize() > 0;
     } else {
-      has = !iter->second.is_cleared;
+      has = !ext.is_cleared;
     }
 
     if (has) {
@@ -111,14 +112,13 @@ void ExtensionSet::AppendToList(
       //   initialized, so they might not even be constructed until
       //   AppendToList() is called.
 
-      if (iter->second.descriptor == NULL) {
-        output->push_back(pool->FindExtensionByNumber(
-            containing_type, iter->first));
+      if (ext.descriptor == NULL) {
+        output->push_back(pool->FindExtensionByNumber(containing_type, number));
       } else {
-        output->push_back(iter->second.descriptor);
+        output->push_back(ext.descriptor);
       }
     }
-  }
+  });
 }
 
 inline FieldDescriptor::Type real_type(FieldType type) {
@@ -145,17 +145,17 @@ inline WireFormatLite::FieldType field_type(FieldType type) {
 const MessageLite& ExtensionSet::GetMessage(int number,
                                             const Descriptor* message_type,
                                             MessageFactory* factory) const {
-  ExtensionMap::const_iterator iter = extensions_.find(number);
-  if (iter == extensions_.end() || iter->second.is_cleared) {
+  const Extension* extension = FindOrNull(number);
+  if (extension == NULL || extension->is_cleared) {
     // Not present.  Return the default value.
     return *factory->GetPrototype(message_type);
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
-    if (iter->second.is_lazy) {
-      return iter->second.lazymessage_value->GetMessage(
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
+    if (extension->is_lazy) {
+      return extension->lazymessage_value->GetMessage(
           *factory->GetPrototype(message_type));
     } else {
-      return *iter->second.message_value;
+      return *extension->message_value;
     }
   }
 }
@@ -188,51 +188,51 @@ MessageLite* ExtensionSet::MutableMessage(const FieldDescriptor* descriptor,
 
 MessageLite* ExtensionSet::ReleaseMessage(const FieldDescriptor* descriptor,
                                           MessageFactory* factory) {
-  ExtensionMap::iterator iter = extensions_.find(descriptor->number());
-  if (iter == extensions_.end()) {
+  Extension* extension = FindOrNull(descriptor->number());
+  if (extension == NULL) {
     // Not present.  Return NULL.
     return NULL;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
     MessageLite* ret = NULL;
-    if (iter->second.is_lazy) {
-      ret = iter->second.lazymessage_value->ReleaseMessage(
+    if (extension->is_lazy) {
+      ret = extension->lazymessage_value->ReleaseMessage(
           *factory->GetPrototype(descriptor->message_type()));
       if (arena_ == NULL) {
-        delete iter->second.lazymessage_value;
+        delete extension->lazymessage_value;
       }
     } else {
       if (arena_ != NULL) {
-        ret = (iter->second.message_value)->New();
-        ret->CheckTypeAndMergeFrom(*(iter->second.message_value));
+        ret = extension->message_value->New();
+        ret->CheckTypeAndMergeFrom(*extension->message_value);
       } else {
-        ret = iter->second.message_value;
+        ret = extension->message_value;
       }
     }
-    extensions_.erase(descriptor->number());
+    Erase(descriptor->number());
     return ret;
   }
 }
 
 MessageLite* ExtensionSet::UnsafeArenaReleaseMessage(
     const FieldDescriptor* descriptor, MessageFactory* factory) {
-  ExtensionMap::iterator iter = extensions_.find(descriptor->number());
-  if (iter == extensions_.end()) {
+  Extension* extension = FindOrNull(descriptor->number());
+  if (extension == NULL) {
     // Not present.  Return NULL.
     return NULL;
   } else {
-    GOOGLE_DCHECK_TYPE(iter->second, OPTIONAL, MESSAGE);
+    GOOGLE_DCHECK_TYPE(*extension, OPTIONAL, MESSAGE);
     MessageLite* ret = NULL;
-    if (iter->second.is_lazy) {
-      ret = iter->second.lazymessage_value->UnsafeArenaReleaseMessage(
+    if (extension->is_lazy) {
+      ret = extension->lazymessage_value->UnsafeArenaReleaseMessage(
           *factory->GetPrototype(descriptor->message_type()));
       if (arena_ == NULL) {
-        delete iter->second.lazymessage_value;
+        delete extension->lazymessage_value;
       }
     } else {
-      ret = iter->second.message_value;
+      ret = extension->message_value;
     }
-    extensions_.erase(descriptor->number());
+    Erase(descriptor->number());
     return ret;
   }
 }
@@ -257,8 +257,10 @@ MessageLite* ExtensionSet::AddMessage(const FieldDescriptor* descriptor,
 
   // RepeatedPtrField<Message> does not know how to Add() since it cannot
   // allocate an abstract object, so we have to be tricky.
-  MessageLite* result = extension->repeated_message_value
-      ->AddFromCleared<GenericTypeHandler<MessageLite> >();
+  MessageLite* result =
+      reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+          extension->repeated_message_value)
+          ->AddFromCleared<GenericTypeHandler<MessageLite> >();
   if (result == NULL) {
     const MessageLite* prototype;
     if (extension->repeated_message_value->size() == 0) {
@@ -341,31 +343,31 @@ bool ExtensionSet::ParseMessageSet(io::CodedInputStream* input,
 }
 
 int ExtensionSet::SpaceUsedExcludingSelf() const {
-  int total_size =
-      extensions_.size() * sizeof(ExtensionMap::value_type);
-  for (ExtensionMap::const_iterator iter = extensions_.begin(),
-       end = extensions_.end();
-       iter != end;
-       ++iter) {
-    total_size += iter->second.SpaceUsedExcludingSelf();
-  }
+  return internal::FromIntSize(SpaceUsedExcludingSelfLong());
+}
+
+size_t ExtensionSet::SpaceUsedExcludingSelfLong() const {
+  size_t total_size = Size() * sizeof(KeyValue);
+  ForEach([&total_size](int /* number */, const Extension& ext) {
+    total_size += ext.SpaceUsedExcludingSelfLong();
+  });
   return total_size;
 }
 
-inline int ExtensionSet::RepeatedMessage_SpaceUsedExcludingSelf(
+inline size_t ExtensionSet::RepeatedMessage_SpaceUsedExcludingSelfLong(
     RepeatedPtrFieldBase* field) {
-  return field->SpaceUsedExcludingSelf<GenericTypeHandler<Message> >();
+  return field->SpaceUsedExcludingSelfLong<GenericTypeHandler<Message> >();
 }
 
-int ExtensionSet::Extension::SpaceUsedExcludingSelf() const {
-  int total_size = 0;
+size_t ExtensionSet::Extension::SpaceUsedExcludingSelfLong() const {
+  size_t total_size = 0;
   if (is_repeated) {
     switch (cpp_type(type)) {
-#define HANDLE_TYPE(UPPERCASE, LOWERCASE)                          \
-      case FieldDescriptor::CPPTYPE_##UPPERCASE:                   \
-        total_size += sizeof(*repeated_##LOWERCASE##_value) +      \
-            repeated_##LOWERCASE##_value->SpaceUsedExcludingSelf();\
-        break
+#define HANDLE_TYPE(UPPERCASE, LOWERCASE)                                     \
+  case FieldDescriptor::CPPTYPE_##UPPERCASE:                                  \
+    total_size += sizeof(*repeated_##LOWERCASE##_value) +                     \
+                  repeated_##LOWERCASE##_value->SpaceUsedExcludingSelfLong(); \
+    break
 
       HANDLE_TYPE(  INT32,   int32);
       HANDLE_TYPE(  INT64,   int64);
@@ -380,24 +382,27 @@ int ExtensionSet::Extension::SpaceUsedExcludingSelf() const {
 
       case FieldDescriptor::CPPTYPE_MESSAGE:
         // repeated_message_value is actually a RepeatedPtrField<MessageLite>,
-        // but MessageLite has no SpaceUsed(), so we must directly call
-        // RepeatedPtrFieldBase::SpaceUsedExcludingSelf() with a different type
-        // handler.
-        total_size += sizeof(*repeated_message_value) +
-            RepeatedMessage_SpaceUsedExcludingSelf(repeated_message_value);
+        // but MessageLite has no SpaceUsedLong(), so we must directly call
+        // RepeatedPtrFieldBase::SpaceUsedExcludingSelfLong() with a different
+        // type handler.
+        total_size +=
+            sizeof(*repeated_message_value) +
+            RepeatedMessage_SpaceUsedExcludingSelfLong(
+                reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+                    repeated_message_value));
         break;
     }
   } else {
     switch (cpp_type(type)) {
       case FieldDescriptor::CPPTYPE_STRING:
         total_size += sizeof(*string_value) +
-                      StringSpaceUsedExcludingSelf(*string_value);
+                      StringSpaceUsedExcludingSelfLong(*string_value);
         break;
       case FieldDescriptor::CPPTYPE_MESSAGE:
         if (is_lazy) {
-          total_size += lazymessage_value->SpaceUsed();
+          total_size += lazymessage_value->SpaceUsedLong();
         } else {
-          total_size += down_cast<Message*>(message_value)->SpaceUsed();
+          total_size += down_cast<Message*>(message_value)->SpaceUsedLong();
         }
         break;
       default:
@@ -427,25 +432,33 @@ uint8* ExtensionSet::SerializeMessageSetWithCachedSizesToArray(
 }
 
 uint8* ExtensionSet::InternalSerializeWithCachedSizesToArray(
-    int start_field_number, int end_field_number,
-    bool deterministic, uint8* target) const {
-  ExtensionMap::const_iterator iter;
-  for (iter = extensions_.lower_bound(start_field_number);
-       iter != extensions_.end() && iter->first < end_field_number;
-       ++iter) {
-    target = iter->second.InternalSerializeFieldWithCachedSizesToArray(
-        iter->first, deterministic, target);
+    int start_field_number, int end_field_number, bool deterministic,
+    uint8* target) const {
+  if (GOOGLE_PREDICT_FALSE(is_large())) {
+    const auto& end = map_.large->end();
+    for (auto it = map_.large->lower_bound(start_field_number);
+         it != end && it->first < end_field_number; ++it) {
+      target = it->second.InternalSerializeFieldWithCachedSizesToArray(
+          it->first, deterministic, target);
+    }
+    return target;
+  }
+  const KeyValue* end = flat_end();
+  for (const KeyValue* it = std::lower_bound(
+           flat_begin(), end, start_field_number, KeyValue::FirstComparator());
+       it != end && it->first < end_field_number; ++it) {
+    target = it->second.InternalSerializeFieldWithCachedSizesToArray(
+        it->first, deterministic, target);
   }
   return target;
 }
 
 uint8* ExtensionSet::InternalSerializeMessageSetWithCachedSizesToArray(
     bool deterministic, uint8* target) const {
-  ExtensionMap::const_iterator iter;
-  for (iter = extensions_.begin(); iter != extensions_.end(); ++iter) {
-    target = iter->second.InternalSerializeMessageSetItemWithCachedSizesToArray(
-        iter->first, deterministic, target);
-  }
+  ForEach([deterministic, &target](int number, const Extension& ext) {
+    target = ext.InternalSerializeMessageSetItemWithCachedSizesToArray(
+        number, deterministic, target);
+  });
   return target;
 }
 
@@ -484,10 +497,10 @@ uint8* ExtensionSet::Extension::InternalSerializeFieldWithCachedSizesToArray(
         HANDLE_TYPE(    ENUM,     Enum,    enum);
 #undef HANDLE_TYPE
 
-        case WireFormatLite::TYPE_STRING:
-        case WireFormatLite::TYPE_BYTES:
-        case WireFormatLite::TYPE_GROUP:
-        case WireFormatLite::TYPE_MESSAGE:
+        case FieldDescriptor::TYPE_STRING:
+        case FieldDescriptor::TYPE_BYTES:
+        case FieldDescriptor::TYPE_GROUP:
+        case FieldDescriptor::TYPE_MESSAGE:
           GOOGLE_LOG(FATAL) << "Non-primitive types can't be packed.";
           break;
       }
@@ -772,9 +785,9 @@ size_t ExtensionSet::Extension::MessageSetItemByteSize(int number) const {
   // message
   size_t message_size = 0;
   if (is_lazy) {
-    message_size = lazymessage_value->ByteSize();
+    message_size = lazymessage_value->ByteSizeLong();
   } else {
-    message_size = message_value->ByteSize();
+    message_size = message_value->ByteSizeLong();
   }
 
   our_size += io::CodedOutputStream::VarintSize32(message_size);
@@ -785,20 +798,16 @@ size_t ExtensionSet::Extension::MessageSetItemByteSize(int number) const {
 
 void ExtensionSet::SerializeMessageSetWithCachedSizes(
     io::CodedOutputStream* output) const {
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    iter->second.SerializeMessageSetItemWithCachedSizes(iter->first, output);
-  }
+  ForEach([output](int number, const Extension& ext) {
+    ext.SerializeMessageSetItemWithCachedSizes(number, output);
+  });
 }
 
 size_t ExtensionSet::MessageSetByteSize() const {
   size_t total_size = 0;
-
-  for (ExtensionMap::const_iterator iter = extensions_.begin();
-       iter != extensions_.end(); ++iter) {
-    total_size += iter->second.MessageSetItemByteSize(iter->first);
-  }
-
+  ForEach([&total_size](int number, const Extension& ext) {
+    total_size += ext.MessageSetItemByteSize(number);
+  });
   return total_size;
 }
 
diff --git a/src/google/protobuf/extension_set_unittest.cc b/src/google/protobuf/extension_set_unittest.cc
index d6b823c0..bc65d295 100644
--- a/src/google/protobuf/extension_set_unittest.cc
+++ b/src/google/protobuf/extension_set_unittest.cc
@@ -32,21 +32,23 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
-#include <google/protobuf/extension_set.h>
+#include <google/protobuf/stubs/casts.h>
+
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/test_util.h>
 #include <google/protobuf/unittest.pb.h>
 #include <google/protobuf/unittest_mset.pb.h>
-#include <google/protobuf/test_util.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/extension_set.h>
 #include <google/protobuf/wire_format.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 #include <google/protobuf/stubs/stl_util.h>
@@ -284,7 +286,7 @@ TEST(ExtensionSetTest, CopyFrom) {
   TestUtil::ExpectAllExtensionsSet(message2);
 }
 
-TEST(ExtensioSetTest, CopyFromPacked) {
+TEST(ExtensionSetTest, CopyFromPacked) {
   unittest::TestPackedExtensions message1, message2;
 
   TestUtil::SetPackedExtensions(&message1);
@@ -443,7 +445,7 @@ TEST(ExtensionSetTest, ArenaSetAllocatedMessageAndRelease) {
 
 TEST(ExtensionSetTest, SwapExtensionBothFullWithArena) {
   ::google::protobuf::Arena arena1;
-  google::protobuf::scoped_ptr<google::protobuf::Arena> arena2(new ::google::protobuf::Arena());
+  std::unique_ptr<google::protobuf::Arena> arena2(new ::google::protobuf::Arena());
 
   unittest::TestAllExtensions* message1 =
       Arena::CreateMessage<unittest::TestAllExtensions>(&arena1);
@@ -600,6 +602,26 @@ TEST(ExtensionSetTest, PackedSerializationToStream) {
   TestUtil::ExpectPackedFieldsSet(destination);
 }
 
+TEST(ExtensionSetTest, NestedExtensionGroup) {
+  // Serialize as TestGroup and parse as TestGroupExtension.
+  unittest::TestGroup source;
+  unittest::TestGroupExtension destination;
+  string data;
+
+  source.mutable_optionalgroup()->set_a(117);
+  source.set_optional_foreign_enum(unittest::FOREIGN_BAZ);
+  source.SerializeToString(&data);
+  EXPECT_TRUE(destination.ParseFromString(data));
+  EXPECT_TRUE(destination.GetExtension(
+      unittest::TestNestedExtension::optionalgroup_extension).has_a());
+  EXPECT_EQ(117, destination.GetExtension(
+      unittest::TestNestedExtension::optionalgroup_extension).a());
+  EXPECT_TRUE(destination.HasExtension(
+      unittest::TestNestedExtension::optional_foreign_enum_extension));
+  EXPECT_EQ(unittest::FOREIGN_BAZ, destination.GetExtension(
+      unittest::TestNestedExtension::optional_foreign_enum_extension));
+}
+
 TEST(ExtensionSetTest, Parsing) {
   // Serialize as TestAllTypes and parse as TestAllExtensions.
   unittest::TestAllTypes source;
@@ -791,11 +813,16 @@ TEST(ExtensionSetTest, SpaceUsedExcludingSelf) {
     message.AddExtension(unittest::repeated_##type##_extension, value);        \
     EXPECT_EQ(empty_repeated_field_size, message.SpaceUsed()) << #type;        \
     message.ClearExtension(unittest::repeated_##type##_extension);             \
+    const int old_capacity =                                                   \
+        message.GetRepeatedExtension(unittest::repeated_##type##_extension)    \
+        .Capacity();                                                           \
+    EXPECT_GE(old_capacity, kMinRepeatedFieldAllocationSize);                  \
     for (int i = 0; i < 16; ++i) {                                             \
       message.AddExtension(unittest::repeated_##type##_extension, value);      \
     }                                                                          \
-    int expected_size = sizeof(cpptype) * (16 -                                \
-        kMinRepeatedFieldAllocationSize) + empty_repeated_field_size;          \
+    int expected_size = sizeof(cpptype) *                                      \
+        (message.GetRepeatedExtension(unittest::repeated_##type##_extension)   \
+         .Capacity() - old_capacity) + empty_repeated_field_size;              \
     EXPECT_LE(expected_size, message.SpaceUsed()) << #type;                    \
   } while (0)
 
@@ -992,8 +1019,8 @@ TEST(ExtensionSetTest, RepeatedFields) {
   ASSERT_EQ(110, SumAllExtensions<double>(
       message, unittest::repeated_double_extension, 0));
 
-  RepeatedPtrField< ::std::string>::iterator string_iter;
-  RepeatedPtrField< ::std::string>::iterator string_end;
+  RepeatedPtrField<::std::string>::iterator string_iter;
+  RepeatedPtrField<::std::string>::iterator string_end;
   for (string_iter = message.MutableRepeatedExtension(
           unittest::repeated_string_extension)->begin(),
        string_end  = message.MutableRepeatedExtension(
@@ -1001,8 +1028,8 @@ TEST(ExtensionSetTest, RepeatedFields) {
        string_iter != string_end; ++string_iter) {
     *string_iter += "test";
   }
-  RepeatedPtrField< ::std::string>::const_iterator string_const_iter;
-  RepeatedPtrField< ::std::string>::const_iterator string_const_end;
+  RepeatedPtrField<::std::string>::const_iterator string_const_iter;
+  RepeatedPtrField<::std::string>::const_iterator string_const_end;
   for (string_const_iter = message.GetRepeatedExtension(
            unittest::repeated_string_extension).begin(),
        string_const_end  = message.GetRepeatedExtension(
diff --git a/src/google/protobuf/field_mask.pb.cc b/src/google/protobuf/field_mask.pb.cc
index b054dffd..000fa8d3 100644
--- a/src/google/protobuf/field_mask.pb.cc
+++ b/src/google/protobuf/field_mask.pb.cc
@@ -1,94 +1,91 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/field_mask.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class FieldMaskDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FieldMask> {
+class FieldMaskDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FieldMask>
+      _instance;
 } _FieldMask_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto {
+static void InitDefaultsFieldMask() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_FieldMask_default_instance_;
+    new (ptr) ::google::protobuf::FieldMask();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FieldMask::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_FieldMask =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsFieldMask}, {}};
 
-::google::protobuf::Metadata file_level_metadata[1];
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_FieldMask.base);
+}
 
-}  // namespace
+::google::protobuf::Metadata file_level_metadata[1];
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldMask, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldMask, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FieldMask, paths_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FieldMask, paths_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(FieldMask)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::FieldMask)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FieldMask_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FieldMask_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/field_mask.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/field_mask.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _FieldMask_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _FieldMask_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n google/protobuf/field_mask.proto\022\017goog"
       "le.protobuf\"\032\n\tFieldMask\022\r\n\005paths\030\001 \003(\tB"
       "\211\001\n\023com.google.protobufB\016FieldMaskProtoP"
@@ -100,48 +97,46 @@ void AddDescriptorsImpl() {
       descriptor, 227);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/field_mask.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void FieldMask::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FieldMask::kPathsFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 FieldMask::FieldMask()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::scc_info_FieldMask.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FieldMask)
 }
 FieldMask::FieldMask(const FieldMask& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      paths_(from.paths_),
-      _cached_size_(0) {
+      paths_(from.paths_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FieldMask)
 }
 
 void FieldMask::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 FieldMask::~FieldMask() {
@@ -153,31 +148,27 @@ void FieldMask::SharedDtor() {
 }
 
 void FieldMask::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FieldMask::descriptor() {
-  protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FieldMask& FieldMask::default_instance() {
-  protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::scc_info_FieldMask.base);
   return *internal_default_instance();
 }
 
-FieldMask* FieldMask::New(::google::protobuf::Arena* arena) const {
-  FieldMask* n = new FieldMask;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void FieldMask::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FieldMask)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   paths_.Clear();
+  _internal_metadata_.Clear();
 }
 
 bool FieldMask::MergePartialFromCodedStream(
@@ -186,19 +177,19 @@ bool FieldMask::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FieldMask)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated string paths = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_paths()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
             this->paths(this->paths_size() - 1).data(),
-            this->paths(this->paths_size() - 1).length(),
+            static_cast<int>(this->paths(this->paths_size() - 1).length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.FieldMask.paths"));
         } else {
@@ -209,12 +200,11 @@ bool FieldMask::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -231,33 +221,47 @@ failure:
 void FieldMask::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FieldMask)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated string paths = 1;
   for (int i = 0, n = this->paths_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->paths(i).data(), this->paths(i).length(),
+      this->paths(i).data(), static_cast<int>(this->paths(i).length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.FieldMask.paths");
     ::google::protobuf::internal::WireFormatLite::WriteString(
       1, this->paths(i), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FieldMask)
 }
 
 ::google::protobuf::uint8* FieldMask::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FieldMask)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated string paths = 1;
   for (int i = 0, n = this->paths_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->paths(i).data(), this->paths(i).length(),
+      this->paths(i).data(), static_cast<int>(this->paths(i).length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.FieldMask.paths");
     target = ::google::protobuf::internal::WireFormatLite::
       WriteStringToArray(1, this->paths(i), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FieldMask)
   return target;
 }
@@ -266,6 +270,11 @@ size_t FieldMask::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.FieldMask)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated string paths = 1;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->paths_size());
@@ -275,9 +284,7 @@ size_t FieldMask::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -300,6 +307,9 @@ void FieldMask::MergeFrom(const FieldMask& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.FieldMask)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   paths_.MergeFrom(from.paths_);
 }
 
@@ -326,89 +336,25 @@ void FieldMask::Swap(FieldMask* other) {
   InternalSwap(other);
 }
 void FieldMask::InternalSwap(FieldMask* other) {
-  paths_.UnsafeArenaSwap(&other->paths_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  paths_.InternalSwap(CastToBase(&other->paths_));
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata FieldMask::GetMetadata() const {
   protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::file_level_metadata[0];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FieldMask
-
-// repeated string paths = 1;
-int FieldMask::paths_size() const {
-  return paths_.size();
-}
-void FieldMask::clear_paths() {
-  paths_.Clear();
-}
-const ::std::string& FieldMask::paths(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FieldMask.paths)
-  return paths_.Get(index);
-}
-::std::string* FieldMask::mutable_paths(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.FieldMask.paths)
-  return paths_.Mutable(index);
-}
-void FieldMask::set_paths(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldMask.paths)
-  paths_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void FieldMask::set_paths(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.FieldMask.paths)
-  paths_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void FieldMask::set_paths(int index, const char* value) {
-  paths_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.FieldMask.paths)
-}
-void FieldMask::set_paths(int index, const char* value, size_t size) {
-  paths_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.FieldMask.paths)
-}
-::std::string* FieldMask::add_paths() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.FieldMask.paths)
-  return paths_.Add();
-}
-void FieldMask::add_paths(const ::std::string& value) {
-  paths_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.FieldMask.paths)
-}
-#if LANG_CXX11
-void FieldMask::add_paths(::std::string&& value) {
-  paths_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.FieldMask.paths)
-}
-#endif
-void FieldMask::add_paths(const char* value) {
-  paths_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.FieldMask.paths)
-}
-void FieldMask::add_paths(const char* value, size_t size) {
-  paths_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.FieldMask.paths)
-}
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-FieldMask::paths() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.FieldMask.paths)
-  return paths_;
-}
-::google::protobuf::RepeatedPtrField< ::std::string>*
-FieldMask::mutable_paths() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.FieldMask.paths)
-  return &paths_;
+  return ::protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FieldMask* Arena::CreateMaybeMessage< ::google::protobuf::FieldMask >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::FieldMask >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/field_mask.pb.h b/src/google/protobuf/field_mask.pb.h
index b609f235..144b41fa 100644
--- a/src/google/protobuf/field_mask.pb.h
+++ b/src/google/protobuf/field_mask.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/field_mask.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2ffield_5fmask_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2ffield_5fmask_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2ffield_5fmask_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2ffield_5fmask_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ffield_5fmask_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto
 namespace google {
 namespace protobuf {
 class FieldMask;
@@ -36,20 +52,13 @@ class FieldMaskDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern FieldMaskDefaultTypeInternal _FieldMask_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2ffield_5fmask_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FieldMask* Arena::CreateMaybeMessage<::google::protobuf::FieldMask>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -64,46 +73,66 @@ class LIBPROTOBUF_EXPORT FieldMask : public ::google::protobuf::Message /* @@pro
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FieldMask(FieldMask&& from) noexcept
+    : FieldMask() {
+    *this = ::std::move(from);
+  }
 
+  inline FieldMask& operator=(FieldMask&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const FieldMask& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FieldMask* internal_default_instance() {
     return reinterpret_cast<const FieldMask*>(
                &_FieldMask_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void Swap(FieldMask* other);
+  friend void swap(FieldMask& a, FieldMask& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FieldMask* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FieldMask* New() const final {
+    return CreateMaybeMessage<FieldMask>(NULL);
+  }
 
-  FieldMask* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FieldMask* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FieldMask>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FieldMask& from);
   void MergeFrom(const FieldMask& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FieldMask* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -114,7 +143,7 @@ class LIBPROTOBUF_EXPORT FieldMask : public ::google::protobuf::Message /* @@pro
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -147,15 +176,18 @@ class LIBPROTOBUF_EXPORT FieldMask : public ::google::protobuf::Message /* @@pro
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::RepeatedPtrField< ::std::string> paths_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ffield_5fmask_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // FieldMask
 
 // repeated string paths = 1;
@@ -184,6 +216,7 @@ inline void FieldMask::set_paths(int index, ::std::string&& value) {
 }
 #endif
 inline void FieldMask::set_paths(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   paths_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.FieldMask.paths)
 }
@@ -202,11 +235,12 @@ inline void FieldMask::add_paths(const ::std::string& value) {
 }
 #if LANG_CXX11
 inline void FieldMask::add_paths(::std::string&& value) {
-  paths_.Add()->assign(std::move(value));
+  paths_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.FieldMask.paths)
 }
 #endif
 inline void FieldMask::add_paths(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   paths_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.FieldMask.paths)
 }
@@ -225,14 +259,15 @@ FieldMask::mutable_paths() {
   return &paths_;
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2ffield_5fmask_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2ffield_5fmask_2eproto
diff --git a/src/google/protobuf/field_mask.proto b/src/google/protobuf/field_mask.proto
index c68d247c..76e09f39 100644
--- a/src/google/protobuf/field_mask.proto
+++ b/src/google/protobuf/field_mask.proto
@@ -240,6 +240,12 @@ option go_package = "google.golang.org/genproto/protobuf/field_mask;field_mask";
 //
 // Note that oneof type names ("test_oneof" in this case) cannot be used in
 // paths.
+//
+// ## Field Mask Verification
+//
+// The implementation of any API method which has a FieldMask type field in the
+// request should verify the included field paths, and return an
+// `INVALID_ARGUMENT` error if any path is duplicated or unmappable.
 message FieldMask {
   // The set of field mask paths.
   repeated string paths = 1;
diff --git a/src/google/protobuf/generated_enum_reflection.h b/src/google/protobuf/generated_enum_reflection.h
index fdcdc277..983d3185 100644
--- a/src/google/protobuf/generated_enum_reflection.h
+++ b/src/google/protobuf/generated_enum_reflection.h
@@ -41,7 +41,6 @@
 
 #include <string>
 
-#include <google/protobuf/stubs/template_util.h>
 #include <google/protobuf/generated_enum_util.h>
 
 namespace google {
diff --git a/src/google/protobuf/generated_enum_util.h b/src/google/protobuf/generated_enum_util.h
index e4242055..96b03cc9 100644
--- a/src/google/protobuf/generated_enum_util.h
+++ b/src/google/protobuf/generated_enum_util.h
@@ -31,14 +31,14 @@
 #ifndef GOOGLE_PROTOBUF_GENERATED_ENUM_UTIL_H__
 #define GOOGLE_PROTOBUF_GENERATED_ENUM_UTIL_H__
 
-#include <google/protobuf/stubs/template_util.h>
+#include <type_traits>
 
 namespace google {
 namespace protobuf {
 
 // This type trait can be used to cause templates to only match proto2 enum
 // types.
-template <typename T> struct is_proto_enum : ::google::protobuf::internal::false_type {};
+template <typename T> struct is_proto_enum : ::std::false_type {};
 
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/generated_message_reflection.cc b/src/google/protobuf/generated_message_reflection.cc
index 2f8f8256..247f772c 100644
--- a/src/google/protobuf/generated_message_reflection.cc
+++ b/src/google/protobuf/generated_message_reflection.cc
@@ -42,9 +42,10 @@
 #include <google/protobuf/extension_set.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/map_field.h>
 #include <google/protobuf/repeated_field.h>
-// #include "google/protobuf/bridge/compatibility_mode_support.h"
+#include <google/protobuf/wire_format.h>
 
 
 #define GOOGLE_PROTOBUF_HAS_ONEOF
@@ -190,37 +191,21 @@ GeneratedMessageReflection::GeneratedMessageReflection(
       schema_(schema),
       descriptor_pool_((pool == NULL) ? DescriptorPool::generated_pool()
                                       : pool),
-      message_factory_(factory) {
+      message_factory_(factory),
+      last_non_weak_field_index_(-1) {
+  last_non_weak_field_index_ = descriptor_->field_count() - 1;
 }
 
 GeneratedMessageReflection::~GeneratedMessageReflection() {}
 
-namespace {
-UnknownFieldSet* empty_unknown_field_set_ = NULL;
-GOOGLE_PROTOBUF_DECLARE_ONCE(empty_unknown_field_set_once_);
-
-void DeleteEmptyUnknownFieldSet() {
-  delete empty_unknown_field_set_;
-  empty_unknown_field_set_ = NULL;
-}
-
-void InitEmptyUnknownFieldSet() {
-  empty_unknown_field_set_ = new UnknownFieldSet;
-  internal::OnShutdown(&DeleteEmptyUnknownFieldSet);
-}
-
-const UnknownFieldSet& GetEmptyUnknownFieldSet() {
-  ::google::protobuf::GoogleOnceInit(&empty_unknown_field_set_once_, &InitEmptyUnknownFieldSet);
-  return *empty_unknown_field_set_;
-}
-}  // namespace
-
 const UnknownFieldSet& GeneratedMessageReflection::GetUnknownFields(
     const Message& message) const {
-  if (descriptor_->file()->syntax() == FileDescriptor::SYNTAX_PROTO3) {
+  if (descriptor_->file()->syntax() == FileDescriptor::SYNTAX_PROTO3 &&
+      !GetProto3PreserveUnknownsDefault()) {
     // We have to ensure that any mutations made to the return value of
-    // MutableUnknownFields() are not reflected here.
-    return GetEmptyUnknownFieldSet();
+    // MutableUnknownFields() are not reflected here when Proto3 defaults to
+    // discard unknowns.
+    return *UnknownFieldSet::default_instance();
   } else {
     return GetInternalMetadataWithArena(message).unknown_fields();
   }
@@ -231,28 +216,25 @@ UnknownFieldSet* GeneratedMessageReflection::MutableUnknownFields(
   return MutableInternalMetadataWithArena(message)->mutable_unknown_fields();
 }
 
-int GeneratedMessageReflection::SpaceUsed(const Message& message) const {
+size_t GeneratedMessageReflection::SpaceUsedLong(const Message& message) const {
   // object_size_ already includes the in-memory representation of each field
   // in the message, so we only need to account for additional memory used by
   // the fields.
-  int total_size = schema_.GetObjectSize();
+  size_t total_size = schema_.GetObjectSize();
 
-  total_size += GetUnknownFields(message).SpaceUsedExcludingSelf();
+  total_size += GetUnknownFields(message).SpaceUsedExcludingSelfLong();
 
   if (schema_.HasExtensionSet()) {
-    total_size += GetExtensionSet(message).SpaceUsedExcludingSelf();
+    total_size += GetExtensionSet(message).SpaceUsedExcludingSelfLong();
   }
-
-  const int field_count = descriptor_->field_count();
-  for (int i = 0; i < field_count; i++) {
+  for (int i = 0; i <= last_non_weak_field_index_; i++) {
     const FieldDescriptor* field = descriptor_->field(i);
-
     if (field->is_repeated()) {
       switch (field->cpp_type()) {
 #define HANDLE_TYPE(UPPERCASE, LOWERCASE)                                     \
         case FieldDescriptor::CPPTYPE_##UPPERCASE :                           \
           total_size += GetRaw<RepeatedField<LOWERCASE> >(message, field)     \
-                          .SpaceUsedExcludingSelf();                          \
+                          .SpaceUsedExcludingSelfLong();                      \
           break
 
         HANDLE_TYPE( INT32,  int32);
@@ -270,21 +252,21 @@ int GeneratedMessageReflection::SpaceUsed(const Message& message) const {
             default:  // TODO(kenton):  Support other string reps.
             case FieldOptions::STRING:
               total_size += GetRaw<RepeatedPtrField<string> >(message, field)
-                              .SpaceUsedExcludingSelf();
+                                .SpaceUsedExcludingSelfLong();
               break;
           }
           break;
 
         case FieldDescriptor::CPPTYPE_MESSAGE:
           if (IsMapFieldInApi(field)) {
-            total_size +=
-                GetRaw<MapFieldBase>(message, field).SpaceUsedExcludingSelf();
+            total_size += GetRaw<MapFieldBase>(message, field)
+                              .SpaceUsedExcludingSelfLong();
           } else {
             // We don't know which subclass of RepeatedPtrFieldBase the type is,
             // so we use RepeatedPtrFieldBase directly.
             total_size +=
                 GetRaw<RepeatedPtrFieldBase>(message, field)
-                  .SpaceUsedExcludingSelf<GenericTypeHandler<Message> >();
+                    .SpaceUsedExcludingSelfLong<GenericTypeHandler<Message> >();
           }
 
           break;
@@ -309,6 +291,13 @@ int GeneratedMessageReflection::SpaceUsed(const Message& message) const {
           switch (field->options().ctype()) {
             default:  // TODO(kenton):  Support other string reps.
             case FieldOptions::STRING: {
+              if (IsInlined(field)) {
+                const string* ptr =
+                    &GetField<InlinedStringField>(message, field).GetNoArena();
+                total_size += StringSpaceUsedExcludingSelfLong(*ptr);
+                break;
+              }
+
               // Initially, the string points to the default value stored in
               // the prototype. Only count the string if it has been changed
               // from the default value.
@@ -320,7 +309,8 @@ int GeneratedMessageReflection::SpaceUsed(const Message& message) const {
               if (ptr != default_ptr) {
                 // string fields are represented by just a pointer, so also
                 // include sizeof(string) as well.
-                total_size += sizeof(*ptr) + StringSpaceUsedExcludingSelf(*ptr);
+                total_size +=
+                    sizeof(*ptr) + StringSpaceUsedExcludingSelfLong(*ptr);
               }
               break;
             }
@@ -335,14 +325,13 @@ int GeneratedMessageReflection::SpaceUsed(const Message& message) const {
           } else {
             const Message* sub_message = GetRaw<const Message*>(message, field);
             if (sub_message != NULL) {
-              total_size += sub_message->SpaceUsed();
+              total_size += sub_message->SpaceUsedLong();
             }
           }
           break;
       }
     }
   }
-
   return total_size;
 }
 
@@ -443,15 +432,25 @@ void GeneratedMessageReflection::SwapField(
             {
               Arena* arena1 = GetArena(message1);
               Arena* arena2 = GetArena(message2);
+
+              if (IsInlined(field)) {
+                InlinedStringField* string1 =
+                    MutableRaw<InlinedStringField>(message1, field);
+                InlinedStringField* string2 =
+                    MutableRaw<InlinedStringField>(message2, field);
+                string1->Swap(string2);
+                break;
+              }
+
               ArenaStringPtr* string1 =
                   MutableRaw<ArenaStringPtr>(message1, field);
               ArenaStringPtr* string2 =
                   MutableRaw<ArenaStringPtr>(message2, field);
+              const string* default_ptr =
+                  &DefaultRaw<ArenaStringPtr>(field).Get();
               if (arena1 == arena2) {
-                string1->Swap(string2);
+                string1->Swap(string2, default_ptr, arena1);
               } else {
-                const string* default_ptr =
-                    &DefaultRaw<ArenaStringPtr>(field).Get();
                 const string temp = string1->Get();
                 string1->Set(default_ptr, string2->Get(), arena1);
                 string2->Set(default_ptr, temp, arena2);
@@ -643,14 +642,11 @@ void GeneratedMessageReflection::Swap(
     }
   }
 
-  const int field_count = descriptor_->field_count();
-  for (int i = 0; i < field_count; i++) {
+  for (int i = 0; i <= last_non_weak_field_index_; i++) {
     const FieldDescriptor* field = descriptor_->field(i);
-    if (!field->containing_oneof()) {
-      SwapField(message1, message2, field);
-    }
+    if (field->containing_oneof()) continue;
+    SwapField(message1, message2, field);
   }
-
   const int oneof_decl_count = descriptor_->oneof_decl_count();
   for (int i = 0; i < oneof_decl_count; i++) {
     SwapOneofField(message1, message2, descriptor_->oneof_decl(i));
@@ -760,7 +756,15 @@ int GeneratedMessageReflection::FieldSize(const Message& message,
       case FieldDescriptor::CPPTYPE_STRING:
       case FieldDescriptor::CPPTYPE_MESSAGE:
         if (IsMapFieldInApi(field)) {
-          return GetRaw<MapFieldBase>(message, field).GetRepeatedField().size();
+          const internal::MapFieldBase& map =
+              GetRaw<MapFieldBase>(message, field);
+          if (map.IsRepeatedFieldValid()) {
+            return map.GetRepeatedField().size();
+          } else {
+            // No need to materialize the repeated field if it is out of sync:
+            // its size will be the same as the map's size.
+            return map.size();
+          }
         } else {
           return GetRaw<RepeatedPtrFieldBase>(message, field).size();
         }
@@ -782,7 +786,6 @@ void GeneratedMessageReflection::ClearField(
       ClearOneofField(message, field);
       return;
     }
-
     if (HasBit(*message, field)) {
       ClearBit(message, field);
 
@@ -812,6 +815,14 @@ void GeneratedMessageReflection::ClearField(
           switch (field->options().ctype()) {
             default:  // TODO(kenton):  Support other string reps.
             case FieldOptions::STRING: {
+              if (IsInlined(field)) {
+                const string* default_ptr =
+                    &DefaultRaw<InlinedStringField>(field).GetNoArena();
+                MutableRaw<InlinedStringField>(message, field)->SetNoArena(
+                    default_ptr, *default_ptr);
+                break;
+              }
+
               const string* default_ptr =
                   &DefaultRaw<ArenaStringPtr>(field).Get();
               MutableRaw<ArenaStringPtr>(message, field)->SetAllocated(
@@ -1025,11 +1036,9 @@ void GeneratedMessageReflection::ListFields(
       schema_.HasHasbits() ? GetHasBits(message) : NULL;
   const uint32* const has_bits_indices = schema_.has_bit_indices_;
   const uint32* const oneof_case_array =
-      &GetConstRefAtOffset<uint32>(message, schema_.oneof_case_offset_);
-
-  const int field_count = descriptor_->field_count();
-  output->reserve(field_count);
-  for (int i = 0; i < field_count; i++) {
+      GetConstPointerAtOffset<uint32>(&message, schema_.oneof_case_offset_);
+  output->reserve(descriptor_->field_count());
+  for (int i = 0; i <= last_non_weak_field_index_; i++) {
     const FieldDescriptor* field = descriptor_->field(i);
     if (field->is_repeated()) {
       if (FieldSize(message, field) > 0) {
@@ -1052,7 +1061,6 @@ void GeneratedMessageReflection::ListFields(
       }
     }
   }
-
   if (schema_.HasExtensionSet()) {
     GetExtensionSet(message).AppendToList(descriptor_, descriptor_pool_,
                                           output);
@@ -1147,12 +1155,13 @@ string GeneratedMessageReflection::GetString(
     switch (field->options().ctype()) {
       default:  // TODO(kenton):  Support other string reps.
       case FieldOptions::STRING: {
+        if (IsInlined(field)) {
+          return GetField<InlinedStringField>(message, field).GetNoArena();
+        }
+
         return GetField<ArenaStringPtr>(message, field).Get();
       }
     }
-
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return GetEmptyString();  // Make compiler happy.
   }
 }
 
@@ -1167,12 +1176,13 @@ const string& GeneratedMessageReflection::GetStringReference(
     switch (field->options().ctype()) {
       default:  // TODO(kenton):  Support other string reps.
       case FieldOptions::STRING: {
+        if (IsInlined(field)) {
+          return GetField<InlinedStringField>(message, field).GetNoArena();
+        }
+
         return GetField<ArenaStringPtr>(message, field).Get();
       }
     }
-
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return GetEmptyString();  // Make compiler happy.
   }
 }
 
@@ -1188,6 +1198,12 @@ void GeneratedMessageReflection::SetString(
     switch (field->options().ctype()) {
       default:  // TODO(kenton):  Support other string reps.
       case FieldOptions::STRING: {
+        if (IsInlined(field)) {
+          MutableField<InlinedStringField>(message, field)->SetNoArena(
+              NULL, value);
+          break;
+        }
+
         const string* default_ptr = &DefaultRaw<ArenaStringPtr>(field).Get();
         if (field->containing_oneof() && !HasOneofField(*message, field)) {
           ClearOneof(message, field->containing_oneof());
@@ -1214,9 +1230,6 @@ string GeneratedMessageReflection::GetRepeatedString(
       case FieldOptions::STRING:
         return GetRepeatedPtrField<string>(message, field, index);
     }
-
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return GetEmptyString();  // Make compiler happy.
   }
 }
 
@@ -1232,9 +1245,6 @@ const string& GeneratedMessageReflection::GetRepeatedStringReference(
       case FieldOptions::STRING:
         return GetRepeatedPtrField<string>(message, field, index);
     }
-
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return GetEmptyString();  // Make compiler happy.
   }
 }
 
@@ -1458,8 +1468,7 @@ const Message& GeneratedMessageReflection::GetMessage(
         GetExtensionSet(message).GetMessage(
           field->number(), field->message_type(), factory));
   } else {
-    const Message* result;
-    result = GetRaw<const Message*>(message, field);
+    const Message* result = GetRaw<const Message*>(message, field);
     if (result == NULL) {
       result = DefaultRaw<const Message*>(field);
     }
@@ -1479,6 +1488,7 @@ Message* GeneratedMessageReflection::MutableMessage(
         MutableExtensionSet(message)->MutableMessage(field, factory));
   } else {
     Message* result;
+
     Message** result_holder = MutableRaw<Message*>(message, field);
 
     if (field->containing_oneof()) {
@@ -1906,6 +1916,10 @@ const Type& GeneratedMessageReflection::GetRaw(
   return GetConstRefAtOffset<Type>(message, schema_.GetFieldOffset(field));
 }
 
+bool GeneratedMessageReflection::IsInlined(const FieldDescriptor* field) const {
+  return schema_.IsFieldInlined(field);
+}
+
 template <typename Type>
 Type* GeneratedMessageReflection::MutableRaw(Message* message,
                                    const FieldDescriptor* field) const {
@@ -1976,6 +1990,7 @@ inline const Type& GeneratedMessageReflection::DefaultRaw(
 // Simple accessors for manipulating has_bits_.
 inline bool GeneratedMessageReflection::HasBit(
     const Message& message, const FieldDescriptor* field) const {
+  GOOGLE_DCHECK(!field->options().weak());
   if (schema_.HasHasbits()) {
     return IsIndexInHasBitSet(GetHasBits(message), schema_.HasBitIndex(field));
   }
@@ -2000,6 +2015,10 @@ inline bool GeneratedMessageReflection::HasBit(
       case FieldDescriptor::CPPTYPE_STRING:
         switch (field->options().ctype()) {
           default: {
+            if (IsInlined(field)) {
+              return !GetField<InlinedStringField>(message, field)
+                  .GetNoArena().empty();
+            }
             return GetField<ArenaStringPtr>(message, field).Get().size() > 0;
           }
         }
@@ -2031,6 +2050,7 @@ inline bool GeneratedMessageReflection::HasBit(
 
 inline void GeneratedMessageReflection::SetBit(
     Message* message, const FieldDescriptor* field) const {
+  GOOGLE_DCHECK(!field->options().weak());
   if (!schema_.HasHasbits()) {
     return;
   }
@@ -2041,6 +2061,7 @@ inline void GeneratedMessageReflection::SetBit(
 
 inline void GeneratedMessageReflection::ClearBit(
     Message* message, const FieldDescriptor* field) const {
+  GOOGLE_DCHECK(!field->options().weak());
   if (!schema_.HasHasbits()) {
     return;
   }
@@ -2051,6 +2072,7 @@ inline void GeneratedMessageReflection::ClearBit(
 
 inline void GeneratedMessageReflection::SwapBit(
     Message* message1, Message* message2, const FieldDescriptor* field) const {
+  GOOGLE_DCHECK(!field->options().weak());
   if (!schema_.HasHasbits()) {
     return;
   }
@@ -2236,16 +2258,16 @@ ReflectionSchema MigrationToReflectionSchema(
     MigrationSchema migration_schema) {
   ReflectionSchema result;
   result.default_instance_ = *default_instance;
-  // First 5 offsets are offsets to the special fields. The following offsets
+  // First 6 offsets are offsets to the special fields. The following offsets
   // are the proto fields.
-  result.offsets_ = offsets + migration_schema.offsets_index + 4;
+  result.offsets_ = offsets + migration_schema.offsets_index + 5;
   result.has_bit_indices_ = offsets + migration_schema.has_bit_indices_index;
   result.has_bits_offset_ = offsets[migration_schema.offsets_index + 0];
   result.metadata_offset_ = offsets[migration_schema.offsets_index + 1];
   result.extensions_offset_ = offsets[migration_schema.offsets_index + 2];
   result.oneof_case_offset_ = offsets[migration_schema.offsets_index + 3];
   result.object_size_ = migration_schema.object_size;
-  result.weak_field_map_offset_ = 0;
+  result.weak_field_map_offset_ = offsets[migration_schema.offsets_index + 4];
   return result;
 }
 
@@ -2272,17 +2294,16 @@ class AssignDescriptorsHelper {
 
     file_level_metadata_->descriptor = descriptor;
 
-    if (!descriptor->options().map_entry()) {
-      // Only set reflection for non map types.
-      file_level_metadata_->reflection = new GeneratedMessageReflection(
-          descriptor, MigrationToReflectionSchema(default_instance_data_++,
-                                                  offsets_, *schemas_),
-          ::google::protobuf::DescriptorPool::generated_pool(), factory_);
-      for (int i = 0; i < descriptor->enum_type_count(); i++) {
-        AssignEnumDescriptor(descriptor->enum_type(i));
-      }
-      schemas_++;
+    file_level_metadata_->reflection = new GeneratedMessageReflection(
+        descriptor,
+        MigrationToReflectionSchema(default_instance_data_, offsets_,
+                                    *schemas_),
+        ::google::protobuf::DescriptorPool::generated_pool(), factory_);
+    for (int i = 0; i < descriptor->enum_type_count(); i++) {
+      AssignEnumDescriptor(descriptor->enum_type(i));
     }
+    schemas_++;
+    default_instance_data_++;
     file_level_metadata_++;
   }
 
@@ -2291,6 +2312,8 @@ class AssignDescriptorsHelper {
     file_level_enum_descriptors_++;
   }
 
+  const Metadata* GetCurrentMetadataPtr() const { return file_level_metadata_; }
+
  private:
   MessageFactory* factory_;
   Metadata* file_level_metadata_;
@@ -2300,12 +2323,46 @@ class AssignDescriptorsHelper {
   const uint32* offsets_;
 };
 
+// We have the routines that assign descriptors and build reflection
+// automatically delete the allocated reflection. MetadataOwner owns
+// all the allocated reflection instances.
+struct MetadataOwner {
+  void AddArray(const Metadata* begin, const Metadata* end) {
+    MutexLock lock(&mu_);
+    metadata_arrays_.push_back(std::make_pair(begin, end));
+  }
+
+  static MetadataOwner* Instance() {
+    static MetadataOwner* res = new MetadataOwner;
+    return res;
+  }
+
+ private:
+  // Use the constructor to register the shutdown code. Because c++ makes sure
+  // this called only once.
+  MetadataOwner() { OnShutdown(&DeleteMetadata); }
+  ~MetadataOwner() {
+    for (int i = 0; i < metadata_arrays_.size(); i++) {
+      for (const Metadata* m = metadata_arrays_[i].first;
+           m < metadata_arrays_[i].second; m++) {
+        delete m->reflection;
+      }
+    }
+  }
+
+  static void DeleteMetadata() {
+    delete Instance();
+  }
+
+  Mutex mu_;
+  std::vector<std::pair<const Metadata*, const Metadata*> > metadata_arrays_;
+};
+
 }  // namespace
 
 void AssignDescriptors(
     const string& filename, const MigrationSchema* schemas,
     const Message* const* default_instances_, const uint32* offsets,
-    MessageFactory* factory,
     // update the following descriptor arrays.
     Metadata* file_level_metadata,
     const EnumDescriptor** file_level_enum_descriptors,
@@ -2314,7 +2371,7 @@ void AssignDescriptors(
       ::google::protobuf::DescriptorPool::generated_pool()->FindFileByName(filename);
   GOOGLE_CHECK(file != NULL);
 
-  if (!factory) factory = MessageFactory::generated_factory();
+  MessageFactory* factory = MessageFactory::generated_factory();
 
   AssignDescriptorsHelper<MigrationSchema> helper(factory, file_level_metadata,
                                  file_level_enum_descriptors, schemas,
@@ -2332,6 +2389,8 @@ void AssignDescriptors(
       file_level_service_descriptors[i] = file->service(i);
     }
   }
+  MetadataOwner::Instance()->AddArray(
+      file_level_metadata, helper.GetCurrentMetadataPtr());
 }
 
 void RegisterAllTypesInternal(const Metadata* file_level_metadata, int size) {
@@ -2352,6 +2411,18 @@ void RegisterAllTypes(const Metadata* file_level_metadata, int size) {
   RegisterAllTypesInternal(file_level_metadata, size);
 }
 
+void UnknownFieldSetSerializer(const uint8* base, uint32 offset, uint32 tag,
+                               uint32 has_offset,
+                               ::google::protobuf::io::CodedOutputStream* output) {
+  const void* ptr = base + offset;
+  const InternalMetadataWithArena* metadata =
+      static_cast<const InternalMetadataWithArena*>(ptr);
+  if (metadata->have_unknown_fields()) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        metadata->unknown_fields(), output);
+  }
+}
+
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/generated_message_reflection.h b/src/google/protobuf/generated_message_reflection.h
index 8b1362a2..31f249b6 100644
--- a/src/google/protobuf/generated_message_reflection.h
+++ b/src/google/protobuf/generated_message_reflection.h
@@ -45,7 +45,6 @@
 // TODO(jasonh): Remove this once the compiler change to directly include this
 // is released to components.
 #include <google/protobuf/generated_enum_reflection.h>
-#include <google/protobuf/generated_message_util.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/unknown_field_set.h>
@@ -62,7 +61,15 @@ namespace protobuf {
 class DescriptorPool;
 class MapKey;
 class MapValueRef;
-}
+}  // namespace protobuf
+
+
+namespace protobuf {
+namespace flat {
+class MetadataBuilder;
+}  // namespace flat
+}  // namespace protobuf
+
 
 namespace protobuf {
 namespace internal {
@@ -73,6 +80,7 @@ class GeneratedMessageReflection;
 
 // Defined in other files.
 class ExtensionSet;             // extension_set.h
+class WeakFieldMap;             // weak_field_map.h
 
 // This struct describes the internal layout of the message, hence this is
 // used to act on the message reflectively.
@@ -83,17 +91,17 @@ class ExtensionSet;             // extension_set.h
 //                  embedded message fields *must* have non-NULL pointers
 //                  in the default instance.)
 //   offsets:       An array of ints giving the byte offsets.
-//                  For each oneof field, the offset is relative to the
-//                  default_oneof_instance. These can be computed at compile
-//                  time using the
-//                  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET() macro.
-//                  For each none oneof field, the offset is related to
-//                  the start of the message object.  These can be computed
-//                  at compile time using the
+//                  For each oneof or weak field, the offset is relative to the
+//                  default_instance. These can be computed at compile time
+//                  using the
+//                  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET()
+//                  macro. For each none oneof field, the offset is related to
+//                  the start of the message object.  These can be computed at
+//                  compile time using the
 //                  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET() macro.
 //                  Besides offsets for all fields, this array also contains
-//                  offsets for oneof unions. The offset of the i-th oneof
-//                  union is offsets[descriptor->field_count() + i].
+//                  offsets for oneof unions. The offset of the i-th oneof union
+//                  is offsets[descriptor->field_count() + i].
 //   has_bit_indices:  Mapping from field indexes to their index in the has
 //                  bit array.
 //   has_bits_offset:  Offset in the message of an array of uint32s of size
@@ -114,31 +122,48 @@ class ExtensionSet;             // extension_set.h
 //                  by sizeof().
 //   arena_offset:  If a message doesn't have a unknown_field_set that stores
 //                  the arena, it must have a direct pointer to the arena.
+//   weak_field_map_offset: If the message proto has weak fields, this is the
+//                  offset of _weak_field_map_ in the generated proto. Otherwise
+//                  -1.
 struct ReflectionSchema {
  public:
   // Size of a google::protobuf::Message object of this type.
-  uint32 GetObjectSize() const { return object_size_; }
+  uint32 GetObjectSize() const { return static_cast<uint32>(object_size_); }
 
   // Offset of a non-oneof field.  Getting a field offset is slightly more
   // efficient when we know statically that it is not a oneof field.
   uint32 GetFieldOffsetNonOneof(const FieldDescriptor* field) const {
     GOOGLE_DCHECK(!field->containing_oneof());
-    return offsets_[field->index()];
+    return OffsetValue(offsets_[field->index()], field->type());
   }
 
   // Offset of any field.
   uint32 GetFieldOffset(const FieldDescriptor* field) const {
     if (field->containing_oneof()) {
-      size_t offset = field->containing_type()->field_count() +
-                      field->containing_oneof()->index();
-      return offsets_[offset];
+      size_t offset =
+          static_cast<size_t>(field->containing_type()->field_count() +
+          field->containing_oneof()->index());
+      return OffsetValue(offsets_[offset], field->type());
     } else {
       return GetFieldOffsetNonOneof(field);
     }
   }
 
+  bool IsFieldInlined(const FieldDescriptor* field) const {
+    if (field->containing_oneof()) {
+      size_t offset =
+          static_cast<size_t>(field->containing_type()->field_count() +
+                              field->containing_oneof()->index());
+      return Inlined(offsets_[offset], field->type());
+    } else {
+      return Inlined(offsets_[field->index()], field->type());
+    }
+  }
+
   uint32 GetOneofCaseOffset(const OneofDescriptor* oneof_descriptor) const {
-    return oneof_case_offset_ + (oneof_descriptor->index() * sizeof(uint32));
+    return static_cast<uint32>(oneof_case_offset_) +
+           static_cast<uint32>(
+               static_cast<size_t>(oneof_descriptor->index()) * sizeof(uint32));
   }
 
   bool HasHasbits() const { return has_bits_offset_ != -1; }
@@ -152,7 +177,7 @@ struct ReflectionSchema {
   // Byte offset of the hasbits array.
   uint32 HasBitsOffset() const {
     GOOGLE_DCHECK(HasHasbits());
-    return has_bits_offset_;
+    return static_cast<uint32>(has_bits_offset_);
   }
 
   // The offset of the InternalMetadataWithArena member.
@@ -160,7 +185,7 @@ struct ReflectionSchema {
   // The schema doesn't contain enough information to distinguish between
   // these two cases.
   uint32 GetMetadataOffset() const {
-    return metadata_offset_;
+    return static_cast<uint32>(metadata_offset_);
   }
 
   // Whether this message has an ExtensionSet.
@@ -169,7 +194,7 @@ struct ReflectionSchema {
   // The offset of the ExtensionSet in this message.
   uint32 GetExtensionSetOffset() const {
     GOOGLE_DCHECK(HasExtensionSet());
-    return extensions_offset_;
+    return static_cast<uint32>(extensions_offset_);
   }
 
   // The off set of WeakFieldMap when the message contains weak fields.
@@ -184,9 +209,12 @@ struct ReflectionSchema {
   // of the underlying data depends on the field's type.
   const void *GetFieldDefault(const FieldDescriptor* field) const {
     return reinterpret_cast<const uint8*>(default_instance_) +
-                     offsets_[field->index()];
+           OffsetValue(offsets_[field->index()], field->type());
   }
 
+
+  bool HasWeakFields() const { return weak_field_map_offset_ > 0; }
+
   // These members are intended to be private, but we cannot actually make them
   // private because this prevents us from using aggregate initialization of
   // them, ie.
@@ -202,6 +230,27 @@ struct ReflectionSchema {
   int oneof_case_offset_;
   int object_size_;
   int weak_field_map_offset_;
+
+  // We tag offset values to provide additional data about fields (such as
+  // inlined).
+  static uint32 OffsetValue(uint32 v, FieldDescriptor::Type type) {
+    if (type == FieldDescriptor::TYPE_STRING ||
+        type == FieldDescriptor::TYPE_BYTES) {
+      return v & ~1u;
+    } else {
+      return v;
+    }
+  }
+
+  static bool Inlined(uint32 v, FieldDescriptor::Type type) {
+    if (type == FieldDescriptor::TYPE_STRING ||
+        type == FieldDescriptor::TYPE_BYTES) {
+      return v & 1u;
+    } else {
+      // Non string/byte fields are not inlined.
+      return false;
+    }
+  }
 };
 
 // Structs that the code generator emits directly to describe a message.
@@ -240,8 +289,7 @@ struct MigrationSchema {
 //    of whatever type the individual field would be.  Strings and
 //    Messages use RepeatedPtrFields while everything else uses
 //    RepeatedFields.
-class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
-    : public Reflection {
+class GeneratedMessageReflection final : public Reflection {
  public:
   // Constructs a GeneratedMessageReflection.
   // Parameters:
@@ -263,7 +311,7 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
   const UnknownFieldSet& GetUnknownFields(const Message& message) const;
   UnknownFieldSet* MutableUnknownFields(Message* message) const;
 
-  int SpaceUsed(const Message& message) const;
+  size_t SpaceUsedLong(const Message& message) const;
 
   bool HasField(const Message& message, const FieldDescriptor* field) const;
   int FieldSize(const Message& message, const FieldDescriptor* field) const;
@@ -481,7 +529,7 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
       const Descriptor* message_type) const;
 
  private:
-  friend class GeneratedMessage;
+  friend class google::protobuf::flat::MetadataBuilder;
   friend class upb::google_opensource::GMR_Handlers;
 
   const Descriptor* const descriptor_;
@@ -489,6 +537,11 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
   const DescriptorPool* const descriptor_pool_;
   MessageFactory* const message_factory_;
 
+  // Last non weak field index. This is an optimization when most weak fields
+  // are at the end of the containing message. If a message proto doesn't
+  // contain weak fields, then this field equals descriptor_->field_count().
+  int last_non_weak_field_index_;
+
   template <class T>
   const T& GetRawNonOneof(const Message& message,
                           const FieldDescriptor* field) const;
@@ -522,6 +575,8 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
   inline InternalMetadataWithArena*
       MutableInternalMetadataWithArena(Message* message) const;
 
+  inline bool IsInlined(const FieldDescriptor* field) const;
+
   inline bool HasBit(const Message& message,
                      const FieldDescriptor* field) const;
   inline void SetBit(Message* message,
@@ -614,40 +669,6 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GeneratedMessageReflection);
 };
 
-// Returns the offset of the given field within the given aggregate type.
-// This is equivalent to the ANSI C offsetof() macro.  However, according
-// to the C++ standard, offsetof() only works on POD types, and GCC
-// enforces this requirement with a warning.  In practice, this rule is
-// unnecessarily strict; there is probably no compiler or platform on
-// which the offsets of the direct fields of a class are non-constant.
-// Fields inherited from superclasses *can* have non-constant offsets,
-// but that's not what this macro will be used for.
-#if defined(__clang__)
-// For Clang we use __builtin_offsetof() and suppress the warning,
-// to avoid Control Flow Integrity and UBSan vptr sanitizers from
-// crashing while trying to validate the invalid reinterpet_casts.
-#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD)    \
-  _Pragma("clang diagnostic push")                            \
-  _Pragma("clang diagnostic ignored \"-Winvalid-offsetof\"")  \
-  __builtin_offsetof(TYPE, FIELD)                             \
-  _Pragma("clang diagnostic pop")
-#else
-// Note that we calculate relative to the pointer value 16 here since if we
-// just use zero, GCC complains about dereferencing a NULL pointer.  We
-// choose 16 rather than some other number just in case the compiler would
-// be confused by an unaligned pointer.
-#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD)    \
-  static_cast< ::google::protobuf::uint32>(                            \
-      reinterpret_cast<const char*>(                                   \
-          &reinterpret_cast<const TYPE*>(16)->FIELD) -                 \
-      reinterpret_cast<const char*>(16))
-#endif
-
-#define PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET(ONEOF, FIELD)     \
-  static_cast< ::google::protobuf::uint32>(                           \
-      reinterpret_cast<const char*>(&(ONEOF->FIELD))                  \
-      - reinterpret_cast<const char*>(ONEOF))
-
 // There are some places in proto2 where dynamic_cast would be useful as an
 // optimization.  For example, take Message::MergeFrom(const Message& other).
 // For a given generated message FooMessage, we generate these two methods:
@@ -668,12 +689,9 @@ class LIBPROTOBUF_EXPORT GeneratedMessageReflection PROTOBUF_FINAL
 // dynamic_cast_if_available() implements this logic.  If RTTI is
 // enabled, it does a dynamic_cast.  If RTTI is disabled, it just returns
 // NULL.
-//
-// If you need to compile without RTTI, simply #define GOOGLE_PROTOBUF_NO_RTTI.
-// On MSVC, this should be detected automatically.
 template<typename To, typename From>
 inline To dynamic_cast_if_available(From from) {
-#if defined(GOOGLE_PROTOBUF_NO_RTTI) || (defined(_MSC_VER)&&!defined(_CPPRTTI))
+#ifdef GOOGLE_PROTOBUF_NO_RTTI
   // Avoid the compiler warning about unused variables.
   (void)from;
   return NULL;
@@ -701,8 +719,7 @@ T* DynamicCastToGenerated(const Message* from) {
   const Message* unused = static_cast<T*>(NULL);
   (void)unused;
 
-#if defined(GOOGLE_PROTOBUF_NO_RTTI) || \
-  (defined(_MSC_VER) && !defined(_CPPRTTI))
+#ifdef GOOGLE_PROTOBUF_NO_RTTI
   bool ok = &T::default_instance() ==
             from->GetReflection()->GetMessageFactory()->GetPrototype(
                 from->GetDescriptor());
@@ -721,7 +738,6 @@ T* DynamicCastToGenerated(Message* from) {
 LIBPROTOBUF_EXPORT void AssignDescriptors(
     const string& filename, const MigrationSchema* schemas,
     const Message* const* default_instances_, const uint32* offsets,
-    MessageFactory* factory,
     // update the following descriptor arrays.
     Metadata* file_level_metadata,
     const EnumDescriptor** file_level_enum_descriptors,
@@ -729,6 +745,11 @@ LIBPROTOBUF_EXPORT void AssignDescriptors(
 
 LIBPROTOBUF_EXPORT void RegisterAllTypes(const Metadata* file_level_metadata, int size);
 
+// These cannot be in lite so we put them in the reflection.
+LIBPROTOBUF_EXPORT void UnknownFieldSetSerializer(const uint8* base, uint32 offset, uint32 tag,
+                               uint32 has_offset,
+                               ::google::protobuf::io::CodedOutputStream* output);
+
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/generated_message_reflection_unittest.cc b/src/google/protobuf/generated_message_reflection_unittest.cc
index 242cc4a1..61eb6603 100644
--- a/src/google/protobuf/generated_message_reflection_unittest.cc
+++ b/src/google/protobuf/generated_message_reflection_unittest.cc
@@ -44,9 +44,6 @@
 
 #include <google/protobuf/generated_message_reflection.h>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/test_util.h>
 #include <google/protobuf/unittest.pb.h>
@@ -360,7 +357,7 @@ TEST(GeneratedMessageReflectionTest, ReleaseLast) {
   ASSERT_EQ(2, message.repeated_foreign_message_size());
   const protobuf_unittest::ForeignMessage* expected =
       message.mutable_repeated_foreign_message(1);
-  google::protobuf::scoped_ptr<Message> released(message.GetReflection()->ReleaseLast(
+  std::unique_ptr<Message> released(message.GetReflection()->ReleaseLast(
       &message, descriptor->FindFieldByName("repeated_foreign_message")));
   EXPECT_EQ(expected, released.get());
 }
@@ -383,7 +380,7 @@ TEST(GeneratedMessageReflectionTest, ReleaseLastExtensions) {
       unittest::repeated_foreign_message_extension));
   const protobuf_unittest::ForeignMessage* expected = message.MutableExtension(
       unittest::repeated_foreign_message_extension, 1);
-  google::protobuf::scoped_ptr<Message> released(message.GetReflection()->ReleaseLast(
+  std::unique_ptr<Message> released(message.GetReflection()->ReleaseLast(
       &message, descriptor->file()->FindExtensionByName(
                     "repeated_foreign_message_extension")));
   EXPECT_EQ(expected, released.get());
@@ -746,6 +743,10 @@ TEST(GeneratedMessageReflectionTest, Oneof) {
       "change_spiece");
   EXPECT_EQ("change_spiece", reflection->GetString(
       message, descriptor->FindFieldByName("bar_string_piece")));
+
+  message.clear_foo();
+  message.clear_bar();
+  TestUtil::ExpectOneofClear(message);
 }
 
 TEST(GeneratedMessageReflectionTest, SetAllocatedOneofMessageTest) {
diff --git a/src/google/protobuf/generated_message_table_driven.cc b/src/google/protobuf/generated_message_table_driven.cc
new file mode 100644
index 00000000..d4450a6c
--- /dev/null
+++ b/src/google/protobuf/generated_message_table_driven.cc
@@ -0,0 +1,104 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/generated_message_table_driven.h>
+
+#include <type_traits>
+
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/generated_message_table_driven_lite.h>
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
+#include <google/protobuf/metadata.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/wire_format.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+namespace {
+
+UnknownFieldSet* MutableUnknownFields(MessageLite* msg, int64 arena_offset) {
+  return Raw<InternalMetadataWithArena>(msg, arena_offset)
+      ->mutable_unknown_fields();
+}
+
+struct UnknownFieldHandler {
+  static bool Skip(MessageLite* msg, const ParseTable& table,
+                   io::CodedInputStream* input,
+                   int tag) {
+    GOOGLE_DCHECK(table.unknown_field_set);
+
+    return WireFormat::SkipField(input, tag,
+        MutableUnknownFields(msg, table.arena_offset));
+  }
+
+  static void Varint(MessageLite* msg, const ParseTable& table,
+                     int tag, int value) {
+    GOOGLE_DCHECK(table.unknown_field_set);
+
+    MutableUnknownFields(msg, table.arena_offset)->AddVarint(
+        WireFormatLite::GetTagFieldNumber(tag), value);
+  }
+
+  static bool ParseExtension(
+      MessageLite* msg, const ParseTable& table,
+      io::CodedInputStream* input, int tag) {
+    ExtensionSet* extensions = GetExtensionSet(msg, table.extension_offset);
+    if (extensions == NULL) {
+      return false;
+    }
+
+    const Message* prototype = down_cast<const Message*>(
+        table.default_instance());
+
+    GOOGLE_DCHECK(prototype != NULL);
+    GOOGLE_DCHECK(table.unknown_field_set);
+    UnknownFieldSet* unknown_fields =
+        MutableUnknownFields(msg, table.arena_offset);
+
+    return extensions->ParseField(tag, input, prototype, unknown_fields);
+  }
+};
+
+}  // namespace
+
+bool MergePartialFromCodedStream(
+    MessageLite* msg, const ParseTable& table, io::CodedInputStream* input) {
+  return MergePartialFromCodedStreamImpl<UnknownFieldHandler,
+                                         InternalMetadataWithArena>(msg, table,
+                                                                    input);
+}
+
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/generated_message_table_driven.h b/src/google/protobuf/generated_message_table_driven.h
new file mode 100644
index 00000000..10ca3aaa
--- /dev/null
+++ b/src/google/protobuf/generated_message_table_driven.h
@@ -0,0 +1,200 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_H__
+#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_H__
+
+#include <google/protobuf/map.h>
+#include <google/protobuf/map_entry_lite.h>
+#include <google/protobuf/map_field_lite.h>
+#include <google/protobuf/message_lite.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+
+// We require C++11 and Clang to use constexpr for variables, as GCC 4.8
+// requires constexpr to be consistent between declarations of variables
+// unnecessarily (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58541).
+// VS 2017 Update 3 also supports this usage of constexpr.
+#if defined(__clang__) || (defined(_MSC_VER) && _MSC_VER >= 1911)
+#define PROTOBUF_CONSTEXPR_VAR constexpr
+#else  // !__clang__
+#define PROTOBUF_CONSTEXPR_VAR
+#endif  // !_clang
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+// Processing-type masks.
+static constexpr const unsigned char kOneofMask = 0x40;
+static constexpr const unsigned char kRepeatedMask = 0x20;
+// Mask for the raw type: either a WireFormatLite::FieldType or one of the
+// ProcessingTypes below, without the oneof or repeated flag.
+static constexpr const unsigned char kTypeMask = 0x1f;
+
+// Wire type masks.
+static constexpr const unsigned char kNotPackedMask = 0x10;
+static constexpr const unsigned char kInvalidMask = 0x20;
+
+enum ProcessingTypes {
+  TYPE_STRING_INLINED = 23,
+  TYPE_BYTES_INLINED = 24,
+  TYPE_MAP = 25,
+};
+
+static_assert(TYPE_MAP < kRepeatedMask, "Invalid enum");
+
+// TODO(ckennelly):  Add a static assertion to ensure that these masks do not
+// conflict with wiretypes.
+
+// ParseTableField is kept small to help simplify instructions for computing
+// offsets, as we will always need this information to parse a field.
+// Additional data, needed for some types, is stored in
+// AuxillaryParseTableField.
+struct ParseTableField {
+  uint32 offset;
+  // The presence_index ordinarily represents a has_bit index, but for fields
+  // inside a oneof it represents the index in _oneof_case_.
+  uint32 presence_index;
+  unsigned char normal_wiretype;
+  unsigned char packed_wiretype;
+
+  // processing_type is given by:
+  //   (FieldDescriptor->type() << 1) | FieldDescriptor->is_packed()
+  unsigned char processing_type;
+
+  unsigned char tag_size;
+};
+
+struct ParseTable;
+
+union AuxillaryParseTableField {
+  typedef bool (*EnumValidator)(int);
+
+  // Enums
+  struct enum_aux {
+    EnumValidator validator;
+  };
+  enum_aux enums;
+  // Group, messages
+  struct message_aux {
+    // ExplicitlyInitialized<T> -> T requires a reinterpret_cast, which prevents
+    // the tables from being constructed as a constexpr.  We use void to avoid
+    // the cast.
+    const void* default_message_void;
+    const MessageLite* default_message() const {
+      return static_cast<const MessageLite*>(default_message_void);
+    }
+  };
+  message_aux messages;
+  // Strings
+  struct string_aux {
+    const void* default_ptr;
+    const char* field_name;
+  };
+  string_aux strings;
+
+  struct map_aux {
+    bool (*parse_map)(io::CodedInputStream*, void*);
+  };
+  map_aux maps;
+
+  AuxillaryParseTableField() = default;
+  constexpr AuxillaryParseTableField(AuxillaryParseTableField::enum_aux e)
+      : enums(e) {}
+  constexpr AuxillaryParseTableField(AuxillaryParseTableField::message_aux m)
+      : messages(m) {}
+  constexpr AuxillaryParseTableField(AuxillaryParseTableField::string_aux s)
+      : strings(s) {}
+  constexpr AuxillaryParseTableField(AuxillaryParseTableField::map_aux m)
+      : maps(m) {}
+};
+
+struct ParseTable {
+  const ParseTableField* fields;
+  const AuxillaryParseTableField* aux;
+  int max_field_number;
+  // TODO(ckennelly): Do something with this padding.
+
+  // TODO(ckennelly): Vet these for sign extension.
+  int64 has_bits_offset;
+  int64 oneof_case_offset;
+  int64 extension_offset;
+  int64 arena_offset;
+
+  // ExplicitlyInitialized<T> -> T requires a reinterpret_cast, which prevents
+  // the tables from being constructed as a constexpr.  We use void to avoid
+  // the cast.
+  const void* default_instance_void;
+  const MessageLite* default_instance() const {
+    return static_cast<const MessageLite*>(default_instance_void);
+  }
+
+  bool unknown_field_set;
+};
+
+static_assert(sizeof(ParseTableField) <= 16, "ParseTableField is too large");
+// The tables must be composed of POD components to ensure link-time
+// initialization.
+static_assert(std::is_pod<ParseTableField>::value, "");
+static_assert(std::is_pod<AuxillaryParseTableField::enum_aux>::value, "");
+static_assert(std::is_pod<AuxillaryParseTableField::message_aux>::value, "");
+static_assert(std::is_pod<AuxillaryParseTableField::string_aux>::value, "");
+static_assert(std::is_pod<ParseTable>::value, "");
+
+#ifndef __NVCC__  // This assertion currently fails under NVCC.
+static_assert(std::is_pod<AuxillaryParseTableField>::value, "");
+#endif
+
+// TODO(ckennelly): Consolidate these implementations into a single one, using
+// dynamic dispatch to the appropriate unknown field handler.
+bool MergePartialFromCodedStream(MessageLite* msg, const ParseTable& table,
+                                 io::CodedInputStream* input);
+bool MergePartialFromCodedStreamLite(MessageLite* msg, const ParseTable& table,
+                                 io::CodedInputStream* input);
+
+template <typename Entry>
+bool ParseMap(io::CodedInputStream* input, void* map_field) {
+  typedef typename MapEntryToMapField<Entry>::MapFieldType MapFieldType;
+  typedef google::protobuf::Map<typename Entry::EntryKeyType,
+                      typename Entry::EntryValueType>
+      MapType;
+  typedef typename Entry::template Parser<MapFieldType, MapType> ParserType;
+
+  ParserType parser(static_cast<MapFieldType*>(map_field));
+  return ::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(input,
+                                                                  &parser);
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_H__
diff --git a/src/google/protobuf/generated_message_table_driven_lite.cc b/src/google/protobuf/generated_message_table_driven_lite.cc
new file mode 100644
index 00000000..961329f3
--- /dev/null
+++ b/src/google/protobuf/generated_message_table_driven_lite.cc
@@ -0,0 +1,109 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/generated_message_table_driven_lite.h>
+
+#include <type_traits>
+
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
+#include <google/protobuf/metadata_lite.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+namespace {
+
+string* MutableUnknownFields(MessageLite* msg, int64 arena_offset) {
+  return Raw<InternalMetadataWithArenaLite>(msg, arena_offset)
+      ->mutable_unknown_fields();
+}
+
+struct UnknownFieldHandlerLite {
+  static bool Skip(MessageLite* msg, const ParseTable& table,
+                   io::CodedInputStream* input,
+                   int tag) {
+    GOOGLE_DCHECK(!table.unknown_field_set);
+    ::google::protobuf::io::StringOutputStream unknown_fields_string(
+        MutableUnknownFields(msg, table.arena_offset));
+    ::google::protobuf::io::CodedOutputStream unknown_fields_stream(
+        &unknown_fields_string, false);
+
+    return ::google::protobuf::internal::WireFormatLite::SkipField(
+        input, tag, &unknown_fields_stream);
+  }
+
+  static void Varint(MessageLite* msg, const ParseTable& table,
+                     int tag, int value) {
+    GOOGLE_DCHECK(!table.unknown_field_set);
+
+    ::google::protobuf::io::StringOutputStream unknown_fields_string(
+        MutableUnknownFields(msg, table.arena_offset));
+    ::google::protobuf::io::CodedOutputStream unknown_fields_stream(
+        &unknown_fields_string, false);
+    unknown_fields_stream.WriteVarint32(tag);
+    unknown_fields_stream.WriteVarint32(value);
+  }
+
+  static bool ParseExtension(
+      MessageLite* msg, const ParseTable& table,
+      io::CodedInputStream* input, int tag) {
+    ExtensionSet* extensions = GetExtensionSet(msg, table.extension_offset);
+    if (extensions == NULL) {
+      return false;
+    }
+
+    const MessageLite* prototype = table.default_instance();
+
+    GOOGLE_DCHECK(!table.unknown_field_set);
+    ::google::protobuf::io::StringOutputStream unknown_fields_string(
+        MutableUnknownFields(msg, table.arena_offset));
+    ::google::protobuf::io::CodedOutputStream unknown_fields_stream(
+        &unknown_fields_string, false);
+    return extensions->ParseField(
+        tag, input, prototype, &unknown_fields_stream);
+  }
+};
+
+}  // namespace
+
+bool MergePartialFromCodedStreamLite(
+    MessageLite* msg, const ParseTable& table, io::CodedInputStream* input) {
+  return MergePartialFromCodedStreamImpl<UnknownFieldHandlerLite,
+                                         InternalMetadataWithArenaLite>(
+      msg, table, input);
+}
+
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/generated_message_table_driven_lite.h b/src/google/protobuf/generated_message_table_driven_lite.h
new file mode 100644
index 00000000..0d90fe33
--- /dev/null
+++ b/src/google/protobuf/generated_message_table_driven_lite.h
@@ -0,0 +1,873 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_LITE_H__
+#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_LITE_H__
+
+#include <google/protobuf/generated_message_table_driven.h>
+
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
+#include <google/protobuf/extension_set.h>
+#include <google/protobuf/implicit_weak_message.h>
+#include <google/protobuf/inlined_string_field.h>
+#include <google/protobuf/metadata_lite.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/wire_format_lite_inl.h>
+#include <type_traits>
+
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+
+enum StringType {
+  StringType_STRING = 0,
+  StringType_INLINED = 3
+};
+
+// Logically a superset of StringType, consisting of all field types that
+// require special initialization.
+enum ProcessingType {
+  ProcessingType_STRING = 0,
+  ProcessingType_CORD = 1,
+  ProcessingType_STRING_PIECE = 2,
+  ProcessingType_INLINED = 3,
+  ProcessingType_MESSAGE = 4,
+};
+
+enum Cardinality {
+  Cardinality_SINGULAR = 0,
+  Cardinality_REPEATED = 1,
+  Cardinality_ONEOF = 3
+};
+
+template <typename Type>
+inline Type* Raw(MessageLite* msg, int64 offset) {
+  return reinterpret_cast<Type*>(reinterpret_cast<uint8*>(msg) + offset);
+}
+
+template <typename Type>
+inline const Type* Raw(const MessageLite* msg, int64 offset) {
+  return reinterpret_cast<const Type*>(reinterpret_cast<const uint8*>(msg) +
+                                       offset);
+}
+
+template <typename InternalMetadata>
+inline Arena* GetArena(MessageLite* msg, int64 arena_offset) {
+  if (GOOGLE_PREDICT_FALSE(arena_offset == -1)) {
+    return NULL;
+  }
+
+  return Raw<InternalMetadata>(msg, arena_offset)->arena();
+}
+
+inline ExtensionSet* GetExtensionSet(MessageLite* msg, int64 extension_offset) {
+  if (extension_offset == -1) {
+    return NULL;
+  }
+
+  return Raw<ExtensionSet>(msg, extension_offset);
+}
+
+template <typename Type>
+inline Type* AddField(MessageLite* msg, int64 offset) {
+  static_assert(std::is_pod<Type>::value ||
+                std::is_same<Type, InlinedStringField>::value,
+                "Do not assign");
+
+  google::protobuf::RepeatedField<Type>* repeated =
+      Raw<google::protobuf::RepeatedField<Type> >(msg, offset);
+  return repeated->Add();
+}
+
+template <>
+inline string* AddField<string>(MessageLite* msg, int64 offset) {
+  google::protobuf::RepeatedPtrField<string>* repeated =
+      Raw<google::protobuf::RepeatedPtrField<string> >(msg, offset);
+  return repeated->Add();
+}
+
+
+template <typename Type>
+inline void AddField(MessageLite* msg, int64 offset, Type value) {
+  static_assert(std::is_pod<Type>::value,
+                "Do not assign");
+  *AddField<Type>(msg, offset) = value;
+}
+
+inline void SetBit(uint32* has_bits, uint32 has_bit_index) {
+  GOOGLE_DCHECK(has_bits != nullptr);
+
+  uint32 mask = static_cast<uint32>(1u) << (has_bit_index % 32);
+  has_bits[has_bit_index / 32u] |= mask;
+}
+
+template <typename Type>
+inline Type* MutableField(MessageLite* msg, uint32* has_bits,
+                          uint32 has_bit_index, int64 offset) {
+  SetBit(has_bits, has_bit_index);
+  return Raw<Type>(msg, offset);
+}
+
+template <typename Type>
+inline void SetField(MessageLite* msg, uint32* has_bits, uint32 has_bit_index,
+                     int64 offset, Type value) {
+  static_assert(std::is_pod<Type>::value,
+                "Do not assign");
+  *MutableField<Type>(msg, has_bits, has_bit_index, offset) = value;
+}
+
+template <typename Type>
+inline void SetOneofField(MessageLite* msg, uint32* oneof_case,
+                          uint32 oneof_case_index, int64 offset,
+                          int field_number, Type value) {
+  oneof_case[oneof_case_index] = field_number;
+  *Raw<Type>(msg, offset) = value;
+}
+
+// Clears a oneof field. The field argument should correspond to the particular
+// field that is currently set in the oneof.
+inline void ClearOneofField(const ParseTableField& field, Arena* arena,
+                     MessageLite* msg) {
+  switch (field.processing_type & kTypeMask) {
+    case WireFormatLite::TYPE_MESSAGE:
+      if (arena == NULL) {
+        delete *Raw<MessageLite*>(msg, field.offset);
+      }
+      break;
+
+    case WireFormatLite::TYPE_STRING:
+    case WireFormatLite::TYPE_BYTES:
+      Raw<ArenaStringPtr>(msg, field.offset)
+          ->Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
+      break;
+
+    case TYPE_STRING_INLINED:
+    case TYPE_BYTES_INLINED:
+      Raw<InlinedStringField>(msg, field.offset)->DestroyNoArena(NULL);
+      break;
+
+    default:
+      // No cleanup needed.
+      break;
+  }
+}
+
+// Clears and reinitializes a oneof field as necessary, in preparation for
+// parsing a new value with type field_type and field number field_number.
+//
+// Note: the oneof_case argument should point directly to the _oneof_case_
+// element corresponding to this particular oneof, not to the beginning of the
+// _oneof_case_ array.
+template <ProcessingType field_type>
+inline void ResetOneofField(const ParseTable& table, int field_number,
+                            Arena* arena, MessageLite* msg, uint32* oneof_case,
+                            int64 offset, const void* default_ptr) {
+  if (*oneof_case == field_number) {
+    // The oneof is already set to the right type, so there is no need to clear
+    // it.
+    return;
+  }
+
+  if (*oneof_case != 0) {
+    ClearOneofField(table.fields[*oneof_case], arena, msg);
+  }
+  *oneof_case = field_number;
+
+  switch (field_type) {
+    case ProcessingType_STRING:
+      Raw<ArenaStringPtr>(msg, offset)
+          ->UnsafeSetDefault(static_cast<const string*>(default_ptr));
+      break;
+    case ProcessingType_INLINED:
+      new (Raw<InlinedStringField>(msg, offset))
+          InlinedStringField(*static_cast<const string*>(default_ptr));
+      break;
+    case ProcessingType_MESSAGE:
+      MessageLite** submessage = Raw<MessageLite*>(msg, offset);
+      const MessageLite* prototype =
+          table.aux[field_number].messages.default_message();
+      *submessage = prototype->New(arena);
+      break;
+  }
+}
+
+template <Cardinality cardinality, bool validate, StringType ctype>
+static inline bool HandleString(io::CodedInputStream* input, MessageLite* msg,
+                                Arena* arena, uint32* has_bits,
+                                uint32 has_bit_index, int64 offset,
+                                const void* default_ptr,
+                                const char* field_name) {
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+  const char* sdata;
+  size_t size;
+#endif
+
+  switch (ctype) {
+    case StringType_INLINED: {
+      InlinedStringField* s;
+      switch (cardinality) {
+        case Cardinality_SINGULAR:
+          // TODO(ckennelly): Is this optimal?
+          s = MutableField<InlinedStringField>(
+              msg, has_bits, has_bit_index, offset);
+          break;
+        case Cardinality_REPEATED:
+          s = AddField<InlinedStringField>(msg, offset);
+          break;
+        case Cardinality_ONEOF:
+          s = Raw<InlinedStringField>(msg, offset);
+          break;
+      }
+      GOOGLE_DCHECK(s != nullptr);
+      ::std::string* value = s->MutableNoArena(NULL);
+
+      if (GOOGLE_PREDICT_FALSE(!WireFormatLite::ReadString(input, value))) {
+        return false;
+      }
+
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+      sdata = value->data();
+      size = value->size();
+#endif
+      break;
+    }
+    case StringType_STRING: {
+      string* value;
+      switch (cardinality) {
+        case Cardinality_SINGULAR:
+          // TODO(ckennelly): Is this optimal?
+          value =
+              MutableField<ArenaStringPtr>(msg, has_bits, has_bit_index, offset)
+                  ->Mutable(static_cast<const string*>(default_ptr), arena);
+          break;
+        case Cardinality_REPEATED:
+          value = AddField<string>(msg, offset);
+          break;
+        case Cardinality_ONEOF:
+          value = Raw<ArenaStringPtr>(msg, offset)
+                      ->Mutable(static_cast<const string*>(default_ptr), arena);
+          break;
+      }
+      GOOGLE_DCHECK(value != nullptr);
+
+      if (GOOGLE_PREDICT_FALSE(!WireFormatLite::ReadString(input, value))) {
+        return false;
+      }
+
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+      sdata = value->data();
+      size = value->size();
+#endif
+      break;
+    }
+  }
+
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+  if (validate) {
+    WireFormatLite::VerifyUtf8String(sdata, size, WireFormatLite::PARSE,
+                                     field_name);
+  }
+#endif
+
+  return true;
+}
+
+template <typename UnknownFieldHandler, typename InternalMetadata,
+          Cardinality cardinality>
+inline bool HandleEnum(const ParseTable& table, io::CodedInputStream* input,
+                       MessageLite* msg, uint32* presence,
+                       uint32 presence_index, int64 offset, uint32 tag,
+                       int field_number) {
+  int value;
+  if (GOOGLE_PREDICT_FALSE(
+          (!WireFormatLite::ReadPrimitive<int, WireFormatLite::TYPE_ENUM>(
+              input, &value)))) {
+    return false;
+  }
+
+  AuxillaryParseTableField::EnumValidator validator =
+      table.aux[field_number].enums.validator;
+  if (validator(value)) {
+    switch (cardinality) {
+      case Cardinality_SINGULAR:
+        SetField(msg, presence, presence_index, offset, value);
+        break;
+      case Cardinality_REPEATED:
+        AddField(msg, offset, value);
+        break;
+      case Cardinality_ONEOF:
+        ClearOneofField(table.fields[presence[presence_index]],
+                        GetArena<InternalMetadata>(msg, table.arena_offset),
+                        msg);
+        SetOneofField(msg, presence, presence_index, offset, field_number,
+                      value);
+        break;
+    }
+  } else {
+    UnknownFieldHandler::Varint(msg, table, tag, value);
+  }
+
+  return true;
+}
+
+// RepeatedMessageTypeHandler allows us to operate on RepeatedPtrField fields
+// without instantiating the specific template.
+class RepeatedMessageTypeHandler {
+ public:
+  typedef MessageLite Type;
+  typedef MessageLite WeakType;
+  static Arena* GetArena(Type* t) { return t->GetArena(); }
+  static void* GetMaybeArenaPointer(Type* t) {
+    return t->GetMaybeArenaPointer();
+  }
+  static inline Type* NewFromPrototype(const Type* prototype,
+                                       Arena* arena = NULL) {
+    return prototype->New(arena);
+  }
+  static void Delete(Type* t, Arena* arena = NULL) {
+    if (arena == NULL) {
+      delete t;
+    }
+  }
+};
+
+class MergePartialFromCodedStreamHelper {
+ public:
+  static MessageLite* Add(RepeatedPtrFieldBase* field,
+                          const MessageLite* prototype) {
+    return field->Add<RepeatedMessageTypeHandler>(
+        const_cast<MessageLite*>(prototype));
+  }
+};
+
+template <typename UnknownFieldHandler, typename InternalMetadata>
+bool MergePartialFromCodedStreamImpl(MessageLite* msg, const ParseTable& table,
+                                     io::CodedInputStream* input) {
+  // We require that has_bits are present, as to avoid having to check for them
+  // for every field.
+  //
+  // TODO(ckennelly):  Make this a compile-time parameter with templates.
+  GOOGLE_DCHECK_GE(table.has_bits_offset, 0);
+  uint32* has_bits = Raw<uint32>(msg, table.has_bits_offset);
+  GOOGLE_DCHECK(has_bits != NULL);
+
+  while (true) {
+    uint32 tag = input->ReadTag();
+
+    const WireFormatLite::WireType wire_type =
+        WireFormatLite::GetTagWireType(tag);
+    const int field_number = WireFormatLite::GetTagFieldNumber(tag);
+
+    if (field_number > table.max_field_number) {
+      // check for possible extensions
+      if (UnknownFieldHandler::ParseExtension(msg, table, input, tag)) {
+        // successfully parsed
+        continue;
+      }
+
+      if (GOOGLE_PREDICT_FALSE(
+              !UnknownFieldHandler::Skip(msg, table, input, tag))) {
+        return false;
+      }
+
+      continue;
+    }
+
+    // We implicitly verify that data points to a valid field as we check the
+    // wire types.  Entries in table.fields[i] that do not correspond to valid
+    // field numbers have their normal_wiretype and packed_wiretype fields set
+    // with the kInvalidMask value.  As wire_type cannot take on that value, we
+    // will never match.
+    const ParseTableField* data = table.fields + field_number;
+
+    // TODO(ckennelly): Avoid sign extension
+    const int64 presence_index = data->presence_index;
+    const int64 offset = data->offset;
+    const unsigned char processing_type = data->processing_type;
+
+    if (data->normal_wiretype == static_cast<unsigned char>(wire_type)) {
+      // TODO(ckennelly): Use a computed goto on GCC/LLVM or otherwise eliminate
+      // the bounds check on processing_type.
+
+      switch (processing_type) {
+#define HANDLE_TYPE(TYPE, CPPTYPE)                                             \
+  case (WireFormatLite::TYPE_##TYPE): {                                        \
+    CPPTYPE value;                                                             \
+    if (GOOGLE_PREDICT_FALSE(                                                    \
+            (!WireFormatLite::ReadPrimitive<                                   \
+                CPPTYPE, WireFormatLite::TYPE_##TYPE>(input, &value)))) {      \
+      return false;                                                            \
+    }                                                                          \
+    SetField(msg, has_bits, presence_index, offset, value);                    \
+    break;                                                                     \
+  }                                                                            \
+  case (WireFormatLite::TYPE_##TYPE) | kRepeatedMask: {                        \
+    google::protobuf::RepeatedField<CPPTYPE>* values =                                   \
+        Raw<google::protobuf::RepeatedField<CPPTYPE> >(msg, offset);                     \
+    if (GOOGLE_PREDICT_FALSE((!WireFormatLite::ReadRepeatedPrimitive<            \
+                            CPPTYPE, WireFormatLite::TYPE_##TYPE>(             \
+            data->tag_size, tag, input, values)))) {                           \
+      return false;                                                            \
+    }                                                                          \
+    break;                                                                     \
+  }                                                                            \
+  case (WireFormatLite::TYPE_##TYPE) | kOneofMask: {                           \
+    uint32* oneof_case = Raw<uint32>(msg, table.oneof_case_offset);            \
+    CPPTYPE value;                                                             \
+    if (GOOGLE_PREDICT_FALSE(                                                    \
+            (!WireFormatLite::ReadPrimitive<                                   \
+                CPPTYPE, WireFormatLite::TYPE_##TYPE>(input, &value)))) {      \
+      return false;                                                            \
+    }                                                                          \
+    ClearOneofField(table.fields[oneof_case[presence_index]],                  \
+                    GetArena<InternalMetadata>(msg, table.arena_offset), msg); \
+    SetOneofField(msg, oneof_case, presence_index, offset, field_number,       \
+                  value);                                                      \
+    break;                                                                     \
+  }
+
+        HANDLE_TYPE(INT32, int32)
+        HANDLE_TYPE(INT64, int64)
+        HANDLE_TYPE(SINT32, int32)
+        HANDLE_TYPE(SINT64, int64)
+        HANDLE_TYPE(UINT32, uint32)
+        HANDLE_TYPE(UINT64, uint64)
+
+        HANDLE_TYPE(FIXED32, uint32)
+        HANDLE_TYPE(FIXED64, uint64)
+        HANDLE_TYPE(SFIXED32, int32)
+        HANDLE_TYPE(SFIXED64, int64)
+
+        HANDLE_TYPE(FLOAT, float)
+        HANDLE_TYPE(DOUBLE, double)
+
+        HANDLE_TYPE(BOOL, bool)
+#undef HANDLE_TYPE
+        case WireFormatLite::TYPE_BYTES:
+#ifndef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case WireFormatLite::TYPE_STRING:
+#endif
+        {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+
+          if (GOOGLE_PREDICT_FALSE((
+                  !HandleString<Cardinality_SINGULAR, false, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, NULL)))) {
+            return false;
+          }
+          break;
+        }
+        case TYPE_BYTES_INLINED:
+#ifndef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case TYPE_STRING_INLINED:
+#endif
+        {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+
+          if (GOOGLE_PREDICT_FALSE((!HandleString<Cardinality_SINGULAR, false,
+                                                StringType_INLINED>(
+                  input, msg, arena, has_bits, presence_index, offset,
+                  default_ptr, NULL)))) {
+            return false;
+          }
+          break;
+        }
+        case WireFormatLite::TYPE_BYTES | kOneofMask:
+#ifndef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case WireFormatLite::TYPE_STRING | kOneofMask:
+#endif
+        {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          uint32* oneof_case = Raw<uint32>(msg, table.oneof_case_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+
+          ResetOneofField<ProcessingType_STRING>(
+              table, field_number, arena, msg, oneof_case + presence_index,
+              offset, default_ptr);
+
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleString<Cardinality_ONEOF, false, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, NULL)))) {
+            return false;
+          }
+          break;
+        }
+        case (WireFormatLite::TYPE_BYTES) | kRepeatedMask:
+        case TYPE_BYTES_INLINED | kRepeatedMask:
+#ifndef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case (WireFormatLite::TYPE_STRING) | kRepeatedMask:
+        case TYPE_STRING_INLINED | kRepeatedMask:
+#endif
+        {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr =
+              table.aux[field_number].strings.default_ptr;
+
+          if (GOOGLE_PREDICT_FALSE((
+                  !HandleString<Cardinality_REPEATED, false, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, NULL)))) {
+            return false;
+          }
+          break;
+        }
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case (WireFormatLite::TYPE_STRING): {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+          const char* field_name = table.aux[field_number].strings.field_name;
+
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleString<Cardinality_SINGULAR, true, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, field_name)))) {
+            return false;
+          }
+          break;
+        }
+        case TYPE_STRING_INLINED | kRepeatedMask:
+        case (WireFormatLite::TYPE_STRING) | kRepeatedMask: {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+          const char* field_name = table.aux[field_number].strings.field_name;
+
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleString<Cardinality_REPEATED, true, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, field_name)))) {
+            return false;
+          }
+          break;
+        }
+        case (WireFormatLite::TYPE_STRING) | kOneofMask: {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          uint32* oneof_case = Raw<uint32>(msg, table.oneof_case_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+          const char* field_name = table.aux[field_number].strings.field_name;
+
+          ResetOneofField<ProcessingType_STRING>(
+              table, field_number, arena, msg, oneof_case + presence_index,
+              offset, default_ptr);
+
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleString<Cardinality_ONEOF, true, StringType_STRING>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, field_name)))) {
+            return false;
+          }
+          break;
+        }
+#endif
+        case WireFormatLite::TYPE_ENUM: {
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleEnum<UnknownFieldHandler, InternalMetadata,
+                               Cardinality_SINGULAR>(
+                      table, input, msg, has_bits, presence_index, offset, tag,
+                      field_number)))) {
+            return false;
+          }
+          break;
+        }
+        case WireFormatLite::TYPE_ENUM | kRepeatedMask: {
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleEnum<UnknownFieldHandler, InternalMetadata,
+                               Cardinality_REPEATED>(
+                      table, input, msg, has_bits, presence_index, offset, tag,
+                      field_number)))) {
+            return false;
+          }
+          break;
+        }
+        case WireFormatLite::TYPE_ENUM | kOneofMask: {
+          uint32* oneof_case = Raw<uint32>(msg, table.oneof_case_offset);
+          if (GOOGLE_PREDICT_FALSE(
+                  (!HandleEnum<UnknownFieldHandler, InternalMetadata,
+                               Cardinality_ONEOF>(table, input, msg, oneof_case,
+                                                  presence_index, offset, tag,
+                                                  field_number)))) {
+            return false;
+          }
+          break;
+        }
+        case WireFormatLite::TYPE_GROUP: {
+          MessageLite** submsg_holder =
+              MutableField<MessageLite*>(msg, has_bits, presence_index, offset);
+          MessageLite* submsg = *submsg_holder;
+
+          if (submsg == NULL) {
+            Arena* const arena =
+                GetArena<InternalMetadata>(msg, table.arena_offset);
+            const MessageLite* prototype =
+                table.aux[field_number].messages.default_message();
+            submsg = prototype->New(arena);
+            *submsg_holder = submsg;
+          }
+
+          if (GOOGLE_PREDICT_FALSE(
+                  !WireFormatLite::ReadGroup(field_number, input, submsg))) {
+            return false;
+          }
+
+          break;
+        }
+        case WireFormatLite::TYPE_GROUP | kRepeatedMask: {
+          RepeatedPtrFieldBase* field = Raw<RepeatedPtrFieldBase>(msg, offset);
+          const MessageLite* prototype =
+              table.aux[field_number].messages.default_message();
+          GOOGLE_DCHECK(prototype != NULL);
+
+          MessageLite* submsg =
+              MergePartialFromCodedStreamHelper::Add(field, prototype);
+
+          if (GOOGLE_PREDICT_FALSE(
+                  !WireFormatLite::ReadGroup(field_number, input, submsg))) {
+            return false;
+          }
+
+          break;
+        }
+        case WireFormatLite::TYPE_MESSAGE: {
+          MessageLite** submsg_holder =
+              MutableField<MessageLite*>(msg, has_bits, presence_index, offset);
+          MessageLite* submsg = *submsg_holder;
+
+          if (submsg == NULL) {
+            Arena* const arena =
+                GetArena<InternalMetadata>(msg, table.arena_offset);
+            const MessageLite* prototype =
+                table.aux[field_number].messages.default_message();
+            if (prototype == NULL) {
+              prototype =
+                  ::google::protobuf::internal::ImplicitWeakMessage::default_instance();
+            }
+            submsg = prototype->New(arena);
+            *submsg_holder = submsg;
+          }
+
+          if (GOOGLE_PREDICT_FALSE(!WireFormatLite::ReadMessage(input, submsg))) {
+            return false;
+          }
+
+          break;
+        }
+        // TODO(ckennelly):  Adapt ReadMessageNoVirtualNoRecursionDepth and
+        // manage input->IncrementRecursionDepth() here.
+        case WireFormatLite::TYPE_MESSAGE | kRepeatedMask: {
+          RepeatedPtrFieldBase* field = Raw<RepeatedPtrFieldBase>(msg, offset);
+          const MessageLite* prototype =
+              table.aux[field_number].messages.default_message();
+          if (prototype == NULL) {
+            prototype =
+                ::google::protobuf::internal::ImplicitWeakMessage::default_instance();
+          }
+
+          MessageLite* submsg =
+              MergePartialFromCodedStreamHelper::Add(field, prototype);
+
+          if (GOOGLE_PREDICT_FALSE(!WireFormatLite::ReadMessage(input, submsg))) {
+            return false;
+          }
+
+          break;
+        }
+        case WireFormatLite::TYPE_MESSAGE | kOneofMask: {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          uint32* oneof_case = Raw<uint32>(msg, table.oneof_case_offset);
+          MessageLite** submsg_holder = Raw<MessageLite*>(msg, offset);
+          ResetOneofField<ProcessingType_MESSAGE>(
+              table, field_number, arena, msg, oneof_case + presence_index,
+              offset, NULL);
+          MessageLite* submsg = *submsg_holder;
+
+          if (GOOGLE_PREDICT_FALSE(!WireFormatLite::ReadMessage(input, submsg))) {
+            return false;
+          }
+
+          break;
+        }
+#ifdef GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case TYPE_STRING_INLINED: {
+          Arena* const arena =
+              GetArena<InternalMetadata>(msg, table.arena_offset);
+          const void* default_ptr = table.aux[field_number].strings.default_ptr;
+          const char* field_name = table.aux[field_number].strings.field_name;
+
+          if (GOOGLE_PREDICT_FALSE((
+                  !HandleString<Cardinality_SINGULAR, true, StringType_INLINED>(
+                      input, msg, arena, has_bits, presence_index, offset,
+                      default_ptr, field_name)))) {
+            return false;
+          }
+          break;
+        }
+#endif  // GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+        case TYPE_MAP: {
+          if (GOOGLE_PREDICT_FALSE(!(*table.aux[field_number].maps.parse_map)(
+                  input, Raw<void>(msg, offset)))) {
+            return false;
+          }
+          break;
+        }
+        case 0: {
+          // Done.
+          return true;
+        }
+        default:
+          break;
+      }
+    } else if (data->packed_wiretype == static_cast<unsigned char>(wire_type)) {
+      // Non-packable fields have their packed_wiretype masked with
+      // kNotPackedMask, which is impossible to match here.
+      GOOGLE_DCHECK(processing_type & kRepeatedMask);
+      GOOGLE_DCHECK_NE(processing_type, kRepeatedMask);
+      GOOGLE_DCHECK_EQ(0, processing_type & kOneofMask);
+
+      GOOGLE_DCHECK_NE(TYPE_BYTES_INLINED | kRepeatedMask, processing_type);
+      GOOGLE_DCHECK_NE(TYPE_STRING_INLINED | kRepeatedMask, processing_type);
+
+      // TODO(ckennelly): Use a computed goto on GCC/LLVM.
+      //
+      // Mask out kRepeatedMask bit, allowing the jump table to be smaller.
+      switch (static_cast<WireFormatLite::FieldType>(
+          processing_type ^ kRepeatedMask)) {
+#define HANDLE_PACKED_TYPE(TYPE, CPPTYPE, CPPTYPE_METHOD)                 \
+  case WireFormatLite::TYPE_##TYPE: {                                     \
+    google::protobuf::RepeatedField<CPPTYPE>* values =                              \
+        Raw<google::protobuf::RepeatedField<CPPTYPE> >(msg, offset);                \
+    if (GOOGLE_PREDICT_FALSE(                                               \
+            (!WireFormatLite::ReadPackedPrimitive<                        \
+                CPPTYPE, WireFormatLite::TYPE_##TYPE>(input, values)))) { \
+      return false;                                                       \
+    }                                                                     \
+    break;                                                                \
+  }
+
+        HANDLE_PACKED_TYPE(INT32, int32, Int32)
+        HANDLE_PACKED_TYPE(INT64, int64, Int64)
+        HANDLE_PACKED_TYPE(SINT32, int32, Int32)
+        HANDLE_PACKED_TYPE(SINT64, int64, Int64)
+        HANDLE_PACKED_TYPE(UINT32, uint32, UInt32)
+        HANDLE_PACKED_TYPE(UINT64, uint64, UInt64)
+
+        HANDLE_PACKED_TYPE(FIXED32, uint32, UInt32)
+        HANDLE_PACKED_TYPE(FIXED64, uint64, UInt64)
+        HANDLE_PACKED_TYPE(SFIXED32, int32, Int32)
+        HANDLE_PACKED_TYPE(SFIXED64, int64, Int64)
+
+        HANDLE_PACKED_TYPE(FLOAT, float, Float)
+        HANDLE_PACKED_TYPE(DOUBLE, double, Double)
+
+        HANDLE_PACKED_TYPE(BOOL, bool, Bool)
+#undef HANDLE_PACKED_TYPE
+        case WireFormatLite::TYPE_ENUM: {
+          // To avoid unnecessarily calling MutableUnknownFields (which mutates
+          // InternalMetadataWithArena) when all inputs in the repeated series
+          // are valid, we implement our own parser rather than call
+          // WireFormat::ReadPackedEnumPreserveUnknowns.
+          uint32 length;
+          if (GOOGLE_PREDICT_FALSE(!input->ReadVarint32(&length))) {
+            return false;
+          }
+
+          AuxillaryParseTableField::EnumValidator validator =
+              table.aux[field_number].enums.validator;
+          google::protobuf::RepeatedField<int>* values =
+              Raw<google::protobuf::RepeatedField<int> >(msg, offset);
+
+          io::CodedInputStream::Limit limit = input->PushLimit(length);
+          while (input->BytesUntilLimit() > 0) {
+            int value;
+            if (GOOGLE_PREDICT_FALSE(
+                    (!google::protobuf::internal::WireFormatLite::ReadPrimitive<
+                        int, WireFormatLite::TYPE_ENUM>(input, &value)))) {
+              return false;
+            }
+
+            if (validator(value)) {
+              values->Add(value);
+            } else {
+              // TODO(ckennelly): Consider caching here.
+              UnknownFieldHandler::Varint(msg, table, tag, value);
+            }
+          }
+          input->PopLimit(limit);
+
+          break;
+        }
+        case WireFormatLite::TYPE_STRING:
+        case WireFormatLite::TYPE_GROUP:
+        case WireFormatLite::TYPE_MESSAGE:
+        case WireFormatLite::TYPE_BYTES:
+          GOOGLE_DCHECK(false);
+          return false;
+        default:
+          break;
+      }
+    } else {
+      if (wire_type == WireFormatLite::WIRETYPE_END_GROUP) {
+        // Must be the end of the message.
+        return true;
+      }
+
+      // check for possible extensions
+      if (UnknownFieldHandler::ParseExtension(msg, table, input, tag)) {
+        // successfully parsed
+        continue;
+      }
+
+      // process unknown field.
+      if (GOOGLE_PREDICT_FALSE(
+              !UnknownFieldHandler::Skip(msg, table, input, tag))) {
+        return false;
+      }
+    }
+  }
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_GENERATED_MESSAGE_TABLE_DRIVEN_LITE_H__
diff --git a/src/google/protobuf/generated_message_util.cc b/src/google/protobuf/generated_message_util.cc
index b4d2c9c1..dac8ca90 100644
--- a/src/google/protobuf/generated_message_util.cc
+++ b/src/google/protobuf/generated_message_util.cc
@@ -35,12 +35,29 @@
 #include <google/protobuf/generated_message_util.h>
 
 #include <limits>
+// We're only using this as a standard way for getting the thread id.
+// We're not using any thread functionality.
+#include <thread>  // NOLINT
+#include <vector>
 
+#include <google/protobuf/io/coded_stream_inl.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/arenastring.h>
+#include <google/protobuf/extension_set.h>
+#include <google/protobuf/message_lite.h>
+#include <google/protobuf/metadata_lite.h>
+#include <google/protobuf/stubs/mutex.h>
+#include <google/protobuf/stubs/port.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/wire_format_lite_inl.h>
 
 namespace google {
+
 namespace protobuf {
 namespace internal {
 
+
 double Infinity() {
   return std::numeric_limits<double>::infinity();
 }
@@ -48,17 +65,17 @@ double NaN() {
   return std::numeric_limits<double>::quiet_NaN();
 }
 
-ExplicitlyConstructed< ::std::string> fixed_address_empty_string;
+ExplicitlyConstructed<::std::string> fixed_address_empty_string;
 GOOGLE_PROTOBUF_DECLARE_ONCE(empty_string_once_init_);
 
-void DeleteEmptyString() { fixed_address_empty_string.Shutdown(); }
+void DeleteEmptyString() { fixed_address_empty_string.Destruct(); }
 
 void InitEmptyString() {
   fixed_address_empty_string.DefaultConstruct();
   OnShutdown(&DeleteEmptyString);
 }
 
-int StringSpaceUsedExcludingSelf(const string& str) {
+size_t StringSpaceUsedExcludingSelfLong(const string& str) {
   const void* start = &str;
   const void* end = &str + 1;
   if (start <= str.data() && str.data() < end) {
@@ -75,6 +92,722 @@ void InitProtobufDefaults() {
   GetEmptyString();
 }
 
+template <typename T>
+const T& Get(const void* ptr) {
+  return *static_cast<const T*>(ptr);
+}
+
+// PrimitiveTypeHelper is a wrapper around the interface of WireFormatLite.
+// WireFormatLite has a very inconvenient interface with respect to template
+// meta-programming. This class wraps the different named functions into
+// a single Serialize / SerializeToArray interface.
+template <int type>
+struct PrimitiveTypeHelper;
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_BOOL> {
+  typedef bool Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteBoolNoTag(Get<bool>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteBoolNoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_INT32> {
+  typedef int32 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteInt32NoTag(Get<int32>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteInt32NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_SINT32> {
+  typedef int32 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteSInt32NoTag(Get<int32>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteSInt32NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_UINT32> {
+  typedef uint32 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteUInt32NoTag(Get<uint32>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteUInt32NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_INT64> {
+  typedef int64 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteInt64NoTag(Get<int64>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteInt64NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_SINT64> {
+  typedef int64 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteSInt64NoTag(Get<int64>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteSInt64NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_UINT64> {
+  typedef uint64 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteUInt64NoTag(Get<uint64>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteUInt64NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED32> {
+  typedef uint32 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteFixed32NoTag(Get<uint32>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteFixed32NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED64> {
+  typedef uint64 Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    WireFormatLite::WriteFixed64NoTag(Get<uint64>(ptr), output);
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    return WireFormatLite::WriteFixed64NoTagToArray(Get<Type>(ptr), buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_ENUM>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_INT32> {};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_SFIXED32>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED32> {
+  typedef int32 Type;
+};
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_SFIXED64>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED64> {
+  typedef int64 Type;
+};
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_FLOAT>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED32> {
+  typedef float Type;
+};
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_DOUBLE>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_FIXED64> {
+  typedef double Type;
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_STRING> {
+  typedef string Type;
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    const Type& value = *static_cast<const Type*>(ptr);
+    output->WriteVarint32(value.size());
+    output->WriteRawMaybeAliased(value.data(), value.size());
+  }
+  static uint8* SerializeToArray(const void* ptr, uint8* buffer) {
+    const Type& value = *static_cast<const Type*>(ptr);
+    return io::CodedOutputStream::WriteStringWithSizeToArray(value, buffer);
+  }
+};
+
+template <>
+struct PrimitiveTypeHelper<WireFormatLite::TYPE_BYTES>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_STRING> {};
+
+
+template <>
+struct PrimitiveTypeHelper<FieldMetadata::kInlinedType>
+    : PrimitiveTypeHelper<WireFormatLite::TYPE_STRING> {};
+
+// We want to serialize to both CodedOutputStream and directly into byte arrays
+// without duplicating the code. In fact we might want extra output channels in
+// the future.
+template <typename O, int type>
+struct OutputHelper;
+
+template <int type, typename O>
+void SerializeTo(const void* ptr, O* output) {
+  OutputHelper<O, type>::Serialize(ptr, output);
+}
+
+template <typename O>
+void WriteTagTo(uint32 tag, O* output) {
+  SerializeTo<WireFormatLite::TYPE_UINT32>(&tag, output);
+}
+
+template <typename O>
+void WriteLengthTo(uint32 length, O* output) {
+  SerializeTo<WireFormatLite::TYPE_UINT32>(&length, output);
+}
+
+// Specialization for coded output stream
+template <int type>
+struct OutputHelper<::google::protobuf::io::CodedOutputStream, type> {
+  static void Serialize(const void* ptr,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+    PrimitiveTypeHelper<type>::Serialize(ptr, output);
+  }
+};
+
+// Specialization for writing into a plain array
+struct ArrayOutput {
+  uint8* ptr;
+  bool is_deterministic;
+};
+
+template <int type>
+struct OutputHelper<ArrayOutput, type> {
+  static void Serialize(const void* ptr, ArrayOutput* output) {
+    output->ptr = PrimitiveTypeHelper<type>::SerializeToArray(ptr, output->ptr);
+  }
+};
+
+void SerializeMessageNoTable(const MessageLite* msg,
+                             ::google::protobuf::io::CodedOutputStream* output) {
+  msg->SerializeWithCachedSizes(output);
+}
+
+void SerializeMessageNoTable(const MessageLite* msg, ArrayOutput* output) {
+  output->ptr = msg->InternalSerializeWithCachedSizesToArray(
+      output->is_deterministic, output->ptr);
+}
+
+// Helper to branch to fast path if possible
+void SerializeMessageDispatch(const ::google::protobuf::MessageLite& msg,
+                              const FieldMetadata* field_table, int num_fields,
+                              int32 cached_size,
+                              ::google::protobuf::io::CodedOutputStream* output) {
+  const uint8* base = reinterpret_cast<const uint8*>(&msg);
+  // Try the fast path
+  uint8* ptr = output->GetDirectBufferForNBytesAndAdvance(cached_size);
+  if (ptr) {
+    // We use virtual dispatch to enable dedicated generated code for the
+    // fast path.
+    msg.InternalSerializeWithCachedSizesToArray(
+        output->IsSerializationDeterministic(), ptr);
+    return;
+  }
+  SerializeInternal(base, field_table, num_fields, output);
+}
+
+// Helper to branch to fast path if possible
+void SerializeMessageDispatch(const ::google::protobuf::MessageLite& msg,
+                              const FieldMetadata* field_table, int num_fields,
+                              int32 cached_size, ArrayOutput* output) {
+  const uint8* base = reinterpret_cast<const uint8*>(&msg);
+  output->ptr = SerializeInternalToArray(base, field_table, num_fields,
+                                         output->is_deterministic, output->ptr);
+}
+
+// Serializing messages is special as it's not a primitive type and needs an
+// explicit overload for each output type.
+template <typename O>
+void SerializeMessageTo(const MessageLite* msg, const void* table_ptr,
+                        O* output) {
+  const SerializationTable* table =
+      static_cast<const SerializationTable*>(table_ptr);
+  if (!table) {
+    // Proto1
+    WriteLengthTo(msg->GetCachedSize(), output);
+    SerializeMessageNoTable(msg, output);
+    return;
+  }
+  const FieldMetadata* field_table = table->field_table;
+  const uint8* base = reinterpret_cast<const uint8*>(msg);
+  int cached_size = *reinterpret_cast<const int32*>(base + field_table->offset);
+  WriteLengthTo(cached_size, output);
+  int num_fields = table->num_fields - 1;
+  SerializeMessageDispatch(*msg, field_table + 1, num_fields, cached_size,
+                           output);
+}
+
+// Almost the same as above only it doesn't output the length field.
+template <typename O>
+void SerializeGroupTo(const MessageLite* msg, const void* table_ptr,
+                      O* output) {
+  const SerializationTable* table =
+      static_cast<const SerializationTable*>(table_ptr);
+  if (!table) {
+    // Proto1
+    SerializeMessageNoTable(msg, output);
+    return;
+  }
+  const FieldMetadata* field_table = table->field_table;
+  const uint8* base = reinterpret_cast<const uint8*>(msg);
+  int cached_size = *reinterpret_cast<const int32*>(base + field_table->offset);
+  int num_fields = table->num_fields - 1;
+  SerializeMessageDispatch(*msg, field_table + 1, num_fields, cached_size,
+                           output);
+}
+
+template <int type>
+struct SingularFieldHelper {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    WriteTagTo(md.tag, output);
+    SerializeTo<type>(field, output);
+  }
+};
+
+template <>
+struct SingularFieldHelper<WireFormatLite::TYPE_STRING> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    WriteTagTo(md.tag, output);
+    SerializeTo<WireFormatLite::TYPE_STRING>(&Get<ArenaStringPtr>(field).Get(),
+                                             output);
+  }
+};
+
+template <>
+struct SingularFieldHelper<WireFormatLite::TYPE_BYTES>
+    : SingularFieldHelper<WireFormatLite::TYPE_STRING> {};
+
+template <>
+struct SingularFieldHelper<WireFormatLite::TYPE_GROUP> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    WriteTagTo(md.tag, output);
+    SerializeGroupTo(Get<const MessageLite*>(field),
+                     static_cast<const SerializationTable*>(md.ptr), output);
+    WriteTagTo(md.tag + 1, output);
+  }
+};
+
+template <>
+struct SingularFieldHelper<WireFormatLite::TYPE_MESSAGE> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    WriteTagTo(md.tag, output);
+    SerializeMessageTo(Get<const MessageLite*>(field),
+                       static_cast<const SerializationTable*>(md.ptr), output);
+  }
+};
+
+template <>
+struct SingularFieldHelper<FieldMetadata::kInlinedType> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    WriteTagTo(md.tag, output);
+    SerializeTo<FieldMetadata::kInlinedType>(&Get<::std::string>(field), output);
+  }
+};
+
+template <int type>
+struct RepeatedFieldHelper {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    typedef typename PrimitiveTypeHelper<type>::Type T;
+    const RepeatedField<T>& array = Get<RepeatedField<T> >(field);
+    for (int i = 0; i < array.size(); i++) {
+      WriteTagTo(md.tag, output);
+      SerializeTo<type>(&array[i], output);
+    }
+  }
+};
+
+// We need to use a helper class to get access to the private members
+class AccessorHelper {
+ public:
+  static int Size(const RepeatedPtrFieldBase& x) { return x.size(); }
+  static void const* Get(const RepeatedPtrFieldBase& x, int idx) {
+    return x.raw_data()[idx];
+  }
+};
+
+template <>
+struct RepeatedFieldHelper<WireFormatLite::TYPE_STRING> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    const internal::RepeatedPtrFieldBase& array =
+        Get<internal::RepeatedPtrFieldBase>(field);
+    for (int i = 0; i < AccessorHelper::Size(array); i++) {
+      WriteTagTo(md.tag, output);
+      SerializeTo<WireFormatLite::TYPE_STRING>(AccessorHelper::Get(array, i),
+                                               output);
+    }
+  }
+};
+
+template <>
+struct RepeatedFieldHelper<WireFormatLite::TYPE_BYTES>
+    : RepeatedFieldHelper<WireFormatLite::TYPE_STRING> {};
+
+template <>
+struct RepeatedFieldHelper<WireFormatLite::TYPE_GROUP> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    const internal::RepeatedPtrFieldBase& array =
+        Get<internal::RepeatedPtrFieldBase>(field);
+    for (int i = 0; i < AccessorHelper::Size(array); i++) {
+      WriteTagTo(md.tag, output);
+      SerializeGroupTo(
+          static_cast<const MessageLite*>(AccessorHelper::Get(array, i)),
+          static_cast<const SerializationTable*>(md.ptr), output);
+      WriteTagTo(md.tag + 1, output);
+    }
+  }
+};
+
+template <>
+struct RepeatedFieldHelper<WireFormatLite::TYPE_MESSAGE> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    const internal::RepeatedPtrFieldBase& array =
+        Get<internal::RepeatedPtrFieldBase>(field);
+    for (int i = 0; i < AccessorHelper::Size(array); i++) {
+      WriteTagTo(md.tag, output);
+      SerializeMessageTo(
+          static_cast<const MessageLite*>(AccessorHelper::Get(array, i)), md.ptr,
+          output);
+    }
+  }
+};
+
+
+template <>
+struct RepeatedFieldHelper<FieldMetadata::kInlinedType>
+    : RepeatedFieldHelper<WireFormatLite::TYPE_STRING> {};
+
+template <int type>
+struct PackedFieldHelper {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    typedef typename PrimitiveTypeHelper<type>::Type T;
+    const RepeatedField<T>& array = Get<RepeatedField<T> >(field);
+    if (array.empty()) return;
+    WriteTagTo(md.tag, output);
+    int cached_size =
+        Get<int>(static_cast<const uint8*>(field) + sizeof(RepeatedField<T>));
+    WriteLengthTo(cached_size, output);
+    for (int i = 0; i < array.size(); i++) {
+      SerializeTo<type>(&array[i], output);
+    }
+  }
+};
+
+template <>
+struct PackedFieldHelper<WireFormatLite::TYPE_STRING> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    GOOGLE_LOG(FATAL) << "Not implemented field number " << md.tag << " with type "
+               << md.type;
+  }
+};
+
+template <>
+struct PackedFieldHelper<WireFormatLite::TYPE_BYTES>
+    : PackedFieldHelper<WireFormatLite::TYPE_STRING> {};
+template <>
+struct PackedFieldHelper<WireFormatLite::TYPE_GROUP>
+    : PackedFieldHelper<WireFormatLite::TYPE_STRING> {};
+template <>
+struct PackedFieldHelper<WireFormatLite::TYPE_MESSAGE>
+    : PackedFieldHelper<WireFormatLite::TYPE_STRING> {};
+template <>
+struct PackedFieldHelper<FieldMetadata::kInlinedType>
+    : PackedFieldHelper<WireFormatLite::TYPE_STRING> {};
+
+template <int type>
+struct OneOfFieldHelper {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    SingularFieldHelper<type>::Serialize(field, md, output);
+  }
+};
+
+
+template <>
+struct OneOfFieldHelper<FieldMetadata::kInlinedType> {
+  template <typename O>
+  static void Serialize(const void* field, const FieldMetadata& md, O* output) {
+    SingularFieldHelper<FieldMetadata::kInlinedType>::Serialize(
+        Get<const ::std::string*>(field), md, output);
+  }
+};
+
+void SerializeNotImplemented(int field) {
+  GOOGLE_LOG(FATAL) << "Not implemented field number " << field;
+}
+
+// When switching to c++11 we should make these constexpr functions
+#define SERIALIZE_TABLE_OP(type, type_class) \
+  ((type - 1) + static_cast<int>(type_class) * FieldMetadata::kNumTypes)
+
+int FieldMetadata::CalculateType(int type,
+                                 FieldMetadata::FieldTypeClass type_class) {
+  return SERIALIZE_TABLE_OP(type, type_class);
+}
+
+template <int type>
+bool IsNull(const void* ptr) {
+  return *static_cast<const typename PrimitiveTypeHelper<type>::Type*>(ptr) ==
+         0;
+}
+
+template <>
+bool IsNull<WireFormatLite::TYPE_STRING>(const void* ptr) {
+  return static_cast<const ArenaStringPtr*>(ptr)->Get().size() == 0;
+}
+
+template <>
+bool IsNull<WireFormatLite::TYPE_BYTES>(const void* ptr) {
+  return static_cast<const ArenaStringPtr*>(ptr)->Get().size() == 0;
+}
+
+template <>
+bool IsNull<WireFormatLite::TYPE_GROUP>(const void* ptr) {
+  return Get<const MessageLite*>(ptr) == NULL;
+}
+
+template <>
+bool IsNull<WireFormatLite::TYPE_MESSAGE>(const void* ptr) {
+  return Get<const MessageLite*>(ptr) == NULL;
+}
+
+
+template <>
+bool IsNull<FieldMetadata::kInlinedType>(const void* ptr) {
+  return static_cast<const ::std::string*>(ptr)->empty();
+}
+
+#define SERIALIZERS_FOR_TYPE(type)                                            \
+  case SERIALIZE_TABLE_OP(type, FieldMetadata::kPresence):                    \
+    if (!IsPresent(base, field_metadata.has_offset)) continue;                \
+    SingularFieldHelper<type>::Serialize(ptr, field_metadata, output);        \
+    break;                                                                    \
+  case SERIALIZE_TABLE_OP(type, FieldMetadata::kNoPresence):                  \
+    if (IsNull<type>(ptr)) continue;                                          \
+    SingularFieldHelper<type>::Serialize(ptr, field_metadata, output);        \
+    break;                                                                    \
+  case SERIALIZE_TABLE_OP(type, FieldMetadata::kRepeated):                    \
+    RepeatedFieldHelper<type>::Serialize(ptr, field_metadata, output);        \
+    break;                                                                    \
+  case SERIALIZE_TABLE_OP(type, FieldMetadata::kPacked):                      \
+    PackedFieldHelper<type>::Serialize(ptr, field_metadata, output);          \
+    break;                                                                    \
+  case SERIALIZE_TABLE_OP(type, FieldMetadata::kOneOf):                       \
+    if (!IsOneofPresent(base, field_metadata.has_offset, field_metadata.tag)) \
+      continue;                                                               \
+    OneOfFieldHelper<type>::Serialize(ptr, field_metadata, output);           \
+    break
+
+void SerializeInternal(const uint8* base,
+                       const FieldMetadata* field_metadata_table,
+                       int32 num_fields,
+                       ::google::protobuf::io::CodedOutputStream* output) {
+  for (int i = 0; i < num_fields; i++) {
+    const FieldMetadata& field_metadata = field_metadata_table[i];
+    const uint8* ptr = base + field_metadata.offset;
+    switch (field_metadata.type) {
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_DOUBLE);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FLOAT);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_INT64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_UINT64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_INT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FIXED64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FIXED32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_BOOL);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_STRING);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_GROUP);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_MESSAGE);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_BYTES);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_UINT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_ENUM);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SFIXED32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SFIXED64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SINT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SINT64);
+      SERIALIZERS_FOR_TYPE(FieldMetadata::kInlinedType);
+
+      // Special cases
+      case FieldMetadata::kSpecial:
+        reinterpret_cast<SpecialSerializer>(
+            const_cast<void*>(field_metadata.ptr))(
+            base, field_metadata.offset, field_metadata.tag,
+            field_metadata.has_offset, output);
+        break;
+      default:
+        // __builtin_unreachable()
+        SerializeNotImplemented(field_metadata.type);
+    }
+  }
+}
+
+uint8* SerializeInternalToArray(const uint8* base,
+                                const FieldMetadata* field_metadata_table,
+                                int32 num_fields, bool is_deterministic,
+                                uint8* buffer) {
+  ArrayOutput array_output = {buffer, is_deterministic};
+  ArrayOutput* output = &array_output;
+  for (int i = 0; i < num_fields; i++) {
+    const FieldMetadata& field_metadata = field_metadata_table[i];
+    const uint8* ptr = base + field_metadata.offset;
+    switch (field_metadata.type) {
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_DOUBLE);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FLOAT);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_INT64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_UINT64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_INT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FIXED64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_FIXED32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_BOOL);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_STRING);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_GROUP);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_MESSAGE);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_BYTES);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_UINT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_ENUM);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SFIXED32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SFIXED64);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SINT32);
+      SERIALIZERS_FOR_TYPE(WireFormatLite::TYPE_SINT64);
+      SERIALIZERS_FOR_TYPE(FieldMetadata::kInlinedType);
+      // Special cases
+      case FieldMetadata::kSpecial: {
+        io::ArrayOutputStream array_stream(array_output.ptr, INT_MAX);
+        io::CodedOutputStream output(&array_stream);
+        output.SetSerializationDeterministic(is_deterministic);
+        reinterpret_cast<SpecialSerializer>(
+            const_cast<void*>(field_metadata.ptr))(
+            base, field_metadata.offset, field_metadata.tag,
+            field_metadata.has_offset, &output);
+        array_output.ptr += output.ByteCount();
+      } break;
+      default:
+        // __builtin_unreachable()
+        SerializeNotImplemented(field_metadata.type);
+    }
+  }
+  return array_output.ptr;
+}
+#undef SERIALIZERS_FOR_TYPE
+
+void ExtensionSerializer(const uint8* ptr, uint32 offset, uint32 tag,
+                         uint32 has_offset,
+                         ::google::protobuf::io::CodedOutputStream* output) {
+  reinterpret_cast<const ExtensionSet*>(ptr + offset)
+      ->SerializeWithCachedSizes(tag, has_offset, output);
+}
+
+void UnknownFieldSerializerLite(const uint8* ptr, uint32 offset, uint32 tag,
+                                uint32 has_offset,
+                                ::google::protobuf::io::CodedOutputStream* output) {
+  output->WriteString(
+      reinterpret_cast<const InternalMetadataWithArenaLite*>(ptr + offset)
+          ->unknown_fields());
+}
+
+MessageLite* DuplicateIfNonNullInternal(MessageLite* message) {
+  if (message) {
+    MessageLite* ret = message->New();
+    ret->CheckTypeAndMergeFrom(*message);
+    return ret;
+  } else {
+    return NULL;
+  }
+}
+
+// Returns a message owned by this Arena.  This may require Own()ing or
+// duplicating the message.
+MessageLite* GetOwnedMessageInternal(Arena* message_arena,
+                                     MessageLite* submessage,
+                                     Arena* submessage_arena) {
+  GOOGLE_DCHECK(submessage->GetArena() == submessage_arena);
+  GOOGLE_DCHECK(message_arena != submessage_arena);
+  if (message_arena != NULL && submessage_arena == NULL) {
+    message_arena->Own(submessage);
+    return submessage;
+  } else {
+    MessageLite* ret = submessage->New(message_arena);
+    ret->CheckTypeAndMergeFrom(*submessage);
+    return ret;
+  }
+}
+
+namespace {
+
+void InitSCC_DFS(SCCInfoBase* scc) {
+  if (scc->visit_status.load(std::memory_order_relaxed) !=
+      SCCInfoBase::kUninitialized) return;
+  scc->visit_status.store(SCCInfoBase::kRunning, std::memory_order_relaxed);
+  // Each base is followed by an array of pointers to deps
+  auto deps = reinterpret_cast<SCCInfoBase* const*>(scc + 1);
+  for (int i = 0; i < scc->num_deps; i++) {
+    if (deps[i]) InitSCC_DFS(deps[i]);
+  }
+  scc->init_func();
+  // Mark done (note we use memory order release here), other threads could
+  // now see this as initialized and thus the initialization must have happened
+  // before.
+  scc->visit_status.store(SCCInfoBase::kInitialized, std::memory_order_release);
+}
+
+}  // namespace
+
+void InitSCCImpl(SCCInfoBase* scc) {
+  static WrappedMutex mu{GOOGLE_PROTOBUF_LINKER_INITIALIZED};
+  // Either the default in case no initialization is running or the id of the
+  // thread that is currently initializing.
+  static std::atomic<std::thread::id> runner;
+  auto me = std::this_thread::get_id();
+  // This will only happen because the constructor will call InitSCC while
+  // constructing the default instance.
+  if (runner.load(std::memory_order_relaxed) == me) {
+    // Because we're in the process of constructing the default instance.
+    // We can be assured that we're already exploring this SCC.
+    GOOGLE_CHECK_EQ(scc->visit_status.load(std::memory_order_relaxed),
+             SCCInfoBase::kRunning);
+    return;
+  }
+  InitProtobufDefaults();
+  mu.Lock();
+  runner.store(me, std::memory_order_relaxed);
+  InitSCC_DFS(scc);
+  runner.store(std::thread::id{}, std::memory_order_relaxed);
+  mu.Unlock();
+}
+
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/generated_message_util.h b/src/google/protobuf/generated_message_util.h
index 14101832..c26e3e52 100644
--- a/src/google/protobuf/generated_message_util.h
+++ b/src/google/protobuf/generated_message_util.h
@@ -39,25 +39,26 @@
 #define GOOGLE_PROTOBUF_GENERATED_MESSAGE_UTIL_H__
 
 #include <assert.h>
+#include <atomic>
+#include <climits>
 #include <string>
+#include <vector>
 
+#include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/stubs/once.h>  // Add direct dep on port for pb.cc
 #include <google/protobuf/has_bits.h>
-
-#ifndef PROTOBUF_FINAL
-#if LANG_CXX11
-#define PROTOBUF_FINAL final
-#else
-#define PROTOBUF_FINAL
-#endif
-#endif  // !PROTOBUF_FINAL
+#include <google/protobuf/implicit_weak_message.h>
+#include <google/protobuf/map_entry_lite.h>
+#include <google/protobuf/message_lite.h>
+#include <google/protobuf/wire_format_lite.h>
 
 namespace google {
 
 namespace protobuf {
 
 class Arena;
+
 namespace io { class CodedInputStream; }
 
 namespace internal {
@@ -75,103 +76,287 @@ namespace internal {
 #define GOOGLE_PROTOBUF_DEPRECATED_ATTR
 
 
+// Returns the offset of the given field within the given aggregate type.
+// This is equivalent to the ANSI C offsetof() macro.  However, according
+// to the C++ standard, offsetof() only works on POD types, and GCC
+// enforces this requirement with a warning.  In practice, this rule is
+// unnecessarily strict; there is probably no compiler or platform on
+// which the offsets of the direct fields of a class are non-constant.
+// Fields inherited from superclasses *can* have non-constant offsets,
+// but that's not what this macro will be used for.
+#if defined(__clang__)
+// For Clang we use __builtin_offsetof() and suppress the warning,
+// to avoid Control Flow Integrity and UBSan vptr sanitizers from
+// crashing while trying to validate the invalid reinterpet_casts.
+#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD)  \
+  _Pragma("clang diagnostic push")                                   \
+  _Pragma("clang diagnostic ignored \"-Winvalid-offsetof\"")         \
+  __builtin_offsetof(TYPE, FIELD)                                    \
+  _Pragma("clang diagnostic pop")
+#else
+// Note that we calculate relative to the pointer value 16 here since if we
+// just use zero, GCC complains about dereferencing a NULL pointer.  We
+// choose 16 rather than some other number just in case the compiler would
+// be confused by an unaligned pointer.
+#define GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(TYPE, FIELD)  \
+  static_cast< ::google::protobuf::uint32>(                           \
+      reinterpret_cast<const char*>(                                 \
+          &reinterpret_cast<const TYPE*>(16)->FIELD) -               \
+      reinterpret_cast<const char*>(16))
+#endif
+
 // Constants for special floating point values.
 LIBPROTOBUF_EXPORT double Infinity();
 LIBPROTOBUF_EXPORT double NaN();
 
-// This type is used to define a global variable, without it's constructor
-// and destructor run on start and end of the program lifetime. This circumvents
-// the initial construction order fiasco, while keeping the address of the
-// empty string a compile time constant.
-template <typename T>
-class ExplicitlyConstructed {
- public:
-  void DefaultConstruct() {
-    new (&union_) T();
-    init_ = true;
+
+// True if IsInitialized() is true for all elements of t.  Type is expected
+// to be a RepeatedPtrField<some message type>.  It's useful to have this
+// helper here to keep the protobuf compiler from ever having to emit loops in
+// IsInitialized() methods.  We want the C++ compiler to inline this or not
+// as it sees fit.
+template <class Type> bool AllAreInitialized(const Type& t) {
+  for (int i = t.size(); --i >= 0; ) {
+    if (!t.Get(i).IsInitialized()) return false;
   }
+  return true;
+}
 
-  bool IsInitialized() { return init_; }
-  void Shutdown() {
-    if (init_) {
-      init_ = false;
-      get_mutable()->~T();
+// "Weak" variant of AllAreInitialized, used to implement implicit weak fields.
+// This version operates on MessageLite to avoid introducing a dependency on the
+// concrete message type.
+template <class T>
+bool AllAreInitializedWeak(const ::google::protobuf::RepeatedPtrField<T>& t) {
+  for (int i = t.size(); --i >= 0;) {
+    if (!reinterpret_cast<const ::google::protobuf::internal::RepeatedPtrFieldBase&>(t)
+             .Get<::google::protobuf::internal::ImplicitWeakTypeHandler<T> >(i)
+             .IsInitialized()) {
+      return false;
     }
   }
+  return true;
+}
 
-#if LANG_CXX11
-  constexpr
-#endif
-      const T&
-      get() const {
-    return reinterpret_cast<const T&>(union_);
-  }
-  T* get_mutable() { return reinterpret_cast<T*>(&union_); }
+LIBPROTOBUF_EXPORT void InitProtobufDefaults();
 
- private:
-  // Prefer c++14 aligned_storage, but for compatibility this will do.
-  union AlignedUnion {
-    char space[sizeof(T)];
-    int64 align_to_int64;
-    void* align_to_ptr;
-  } union_;
-  bool init_;  // false by linker
+struct LIBPROTOBUF_EXPORT FieldMetadata {
+  uint32 offset;  // offset of this field in the struct
+  uint32 tag;     // field * 8 + wire_type
+  // byte offset * 8 + bit_offset;
+  // if the high bit is set then this is the byte offset of the oneof_case
+  // for this field.
+  uint32 has_offset;
+  uint32 type;      // the type of this field.
+  const void* ptr;  // auxiliary data
+
+  // From the serializer point of view each fundamental type can occur in
+  // 4 different ways. For simplicity we treat all combinations as a cartesion
+  // product although not all combinations are allowed.
+  enum FieldTypeClass {
+    kPresence,
+    kNoPresence,
+    kRepeated,
+    kPacked,
+    kOneOf,
+    kNumTypeClasses  // must be last enum
+  };
+  // C++ protobuf has 20 fundamental types, were we added Cord and StringPiece
+  // and also distinquish the same types if they have different wire format.
+  enum {
+    kCordType = 19,
+    kStringPieceType = 20,
+    kInlinedType = 21,
+    kNumTypes = 21,
+    kSpecial = kNumTypes * kNumTypeClasses,
+  };
+
+  static int CalculateType(int fundamental_type, FieldTypeClass type_class);
 };
 
-// TODO(jieluo): Change to template. We have tried to use template,
-// but it causes net/rpc/python:rpcutil_test fail (the empty string will
-// init twice). It may related to swig. Change to template after we
-// found the solution.
+inline bool IsPresent(const void* base, uint32 hasbit) {
+  const uint32* has_bits_array = static_cast<const uint32*>(base);
+  return (has_bits_array[hasbit / 32] & (1u << (hasbit & 31))) != 0;
+}
+
+inline bool IsOneofPresent(const void* base, uint32 offset, uint32 tag) {
+  const uint32* oneof =
+      reinterpret_cast<const uint32*>(static_cast<const uint8*>(base) + offset);
+  return *oneof == tag >> 3;
+}
+
+typedef void (*SpecialSerializer)(const uint8* base, uint32 offset, uint32 tag,
+                                  uint32 has_offset,
+                                  ::google::protobuf::io::CodedOutputStream* output);
+
+LIBPROTOBUF_EXPORT void ExtensionSerializer(const uint8* base, uint32 offset, uint32 tag,
+                         uint32 has_offset,
+                         ::google::protobuf::io::CodedOutputStream* output);
+LIBPROTOBUF_EXPORT void UnknownFieldSerializerLite(const uint8* base, uint32 offset, uint32 tag,
+                                uint32 has_offset,
+                                ::google::protobuf::io::CodedOutputStream* output);
 
-// Default empty string object. Don't use this directly. Instead, call
-// GetEmptyString() to get the reference.
-LIBPROTOBUF_EXPORT extern ExplicitlyConstructed< ::std::string> fixed_address_empty_string;
-LIBPROTOBUF_EXPORT extern ProtobufOnceType empty_string_once_init_;
-LIBPROTOBUF_EXPORT void InitEmptyString();
+struct SerializationTable {
+  int num_fields;
+  const FieldMetadata* field_table;
+};
 
+LIBPROTOBUF_EXPORT void SerializeInternal(const uint8* base, const FieldMetadata* table,
+                       int num_fields, ::google::protobuf::io::CodedOutputStream* output);
 
-LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyStringAlreadyInited() {
-  return fixed_address_empty_string.get();
+inline void TableSerialize(const ::google::protobuf::MessageLite& msg,
+                           const SerializationTable* table,
+                           ::google::protobuf::io::CodedOutputStream* output) {
+  const FieldMetadata* field_table = table->field_table;
+  int num_fields = table->num_fields - 1;
+  const uint8* base = reinterpret_cast<const uint8*>(&msg);
+  // TODO(gerbens) This skips the first test if we could use the fast
+  // array serialization path, we should make this
+  // int cached_size =
+  //    *reinterpret_cast<const int32*>(base + field_table->offset);
+  // SerializeWithCachedSize(msg, field_table + 1, num_fields, cached_size, ...)
+  // But we keep conformance with the old way for now.
+  SerializeInternal(base, field_table + 1, num_fields, output);
 }
 
-LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
-  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
-  return GetEmptyStringAlreadyInited();
+uint8* SerializeInternalToArray(const uint8* base, const FieldMetadata* table,
+                                int num_fields, bool is_deterministic,
+                                uint8* buffer);
+
+inline uint8* TableSerializeToArray(const ::google::protobuf::MessageLite& msg,
+                                    const SerializationTable* table,
+                                    bool is_deterministic, uint8* buffer) {
+  const uint8* base = reinterpret_cast<const uint8*>(&msg);
+  const FieldMetadata* field_table = table->field_table + 1;
+  int num_fields = table->num_fields - 1;
+  return SerializeInternalToArray(base, field_table, num_fields,
+                                  is_deterministic, buffer);
 }
 
-LIBPROTOBUF_EXPORT int StringSpaceUsedExcludingSelf(const string& str);
+template <typename T>
+struct CompareHelper {
+  bool operator()(const T& a, const T& b) { return a < b; }
+};
 
+template <>
+struct CompareHelper<ArenaStringPtr> {
+  bool operator()(const ArenaStringPtr& a, const ArenaStringPtr& b) {
+    return a.Get() < b.Get();
+  }
+};
 
-// True if IsInitialized() is true for all elements of t.  Type is expected
-// to be a RepeatedPtrField<some message type>.  It's useful to have this
-// helper here to keep the protobuf compiler from ever having to emit loops in
-// IsInitialized() methods.  We want the C++ compiler to inline this or not
-// as it sees fit.
-template <class Type> bool AllAreInitialized(const Type& t) {
-  for (int i = t.size(); --i >= 0; ) {
-    if (!t.Get(i).IsInitialized()) return false;
+struct CompareMapKey {
+  template <typename T>
+  bool operator()(const MapEntryHelper<T>& a, const MapEntryHelper<T>& b) {
+    return Compare(a.key_, b.key_);
+  }
+  template <typename T>
+  bool Compare(const T& a, const T& b) {
+    return CompareHelper<T>()(a, b);
+  }
+};
+
+template <typename MapFieldType, const SerializationTable* table>
+void MapFieldSerializer(const uint8* base, uint32 offset, uint32 tag,
+                        uint32 has_offset,
+                        ::google::protobuf::io::CodedOutputStream* output) {
+  typedef MapEntryHelper<typename MapFieldType::EntryTypeTrait> Entry;
+  typedef typename MapFieldType::MapType::const_iterator Iter;
+
+  const MapFieldType& map_field =
+      *reinterpret_cast<const MapFieldType*>(base + offset);
+  const SerializationTable* t =
+      table +
+      has_offset;  // has_offset is overloaded for maps to mean table offset
+  if (!output->IsSerializationDeterministic()) {
+    for (Iter it = map_field.GetMap().begin(); it != map_field.GetMap().end();
+         ++it) {
+      Entry map_entry(*it);
+      output->WriteVarint32(tag);
+      output->WriteVarint32(map_entry._cached_size_);
+      SerializeInternal(reinterpret_cast<const uint8*>(&map_entry),
+                        t->field_table, t->num_fields, output);
+    }
+  } else {
+    std::vector<Entry> v;
+    for (Iter it = map_field.GetMap().begin(); it != map_field.GetMap().end();
+         ++it) {
+      v.push_back(Entry(*it));
+    }
+    std::sort(v.begin(), v.end(), CompareMapKey());
+    for (int i = 0; i < v.size(); i++) {
+      output->WriteVarint32(tag);
+      output->WriteVarint32(v[i]._cached_size_);
+      SerializeInternal(reinterpret_cast<const uint8*>(&v[i]), t->field_table,
+                        t->num_fields, output);
+    }
   }
-  return true;
 }
 
-LIBPROTOBUF_EXPORT void InitProtobufDefaults();
+LIBPROTOBUF_EXPORT MessageLite* DuplicateIfNonNullInternal(MessageLite* message);
+LIBPROTOBUF_EXPORT MessageLite* GetOwnedMessageInternal(Arena* message_arena,
+                                     MessageLite* submessage,
+                                     Arena* submessage_arena);
 
-// We compute sizes as size_t but cache them as int.  This function converts a
-// computed size to a cached size.  Since we don't proceed with serialization if
-// the total size was > INT_MAX, it is not important what this function returns
-// for inputs > INT_MAX.
-inline int ToCachedSize(size_t size) {
-  return static_cast<int>(size);
+template <typename T>
+T* DuplicateIfNonNull(T* message) {
+  // The casts must be reinterpret_cast<> because T might be a forward-declared
+  // type that the compiler doesn't know is related to MessageLite.
+  return reinterpret_cast<T*>(
+      DuplicateIfNonNullInternal(reinterpret_cast<MessageLite*>(message)));
 }
 
-// We mainly calculate sizes in terms of size_t, but some functions that compute
-// sizes return "int".  These int sizes are expected to always be positive.
-// This function is more efficient than casting an int to size_t directly on
-// 64-bit platforms because it avoids making the compiler emit a sign extending
-// instruction, which we don't want and don't want to pay for.
-inline size_t FromIntSize(int size) {
-  // Convert to unsigned before widening so sign extension is not necessary.
-  return static_cast<unsigned int>(size);
+template <typename T>
+T* GetOwnedMessage(Arena* message_arena, T* submessage,
+                   Arena* submessage_arena) {
+  // The casts must be reinterpret_cast<> because T might be a forward-declared
+  // type that the compiler doesn't know is related to MessageLite.
+  return reinterpret_cast<T*>(GetOwnedMessageInternal(
+      message_arena, reinterpret_cast<MessageLite*>(submessage),
+      submessage_arena));
+}
+
+// Hide atomic from the public header and allow easy change to regular int
+// on platforms where the atomic might have a perf impact.
+class LIBPROTOBUF_EXPORT CachedSize {
+ public:
+  int Get() const { return size_.load(std::memory_order_relaxed); }
+  void Set(int size) { size_.store(size, std::memory_order_relaxed); }
+ private:
+  std::atomic<int> size_{0};
+};
+
+// SCCInfo represents information of a strongly connected component of
+// mutual dependent messages.
+struct LIBPROTOBUF_EXPORT SCCInfoBase {
+  // We use 0 for the Initialized state, because test eax,eax, jnz is smaller
+  // and is subject to macro fusion.
+  enum {
+    kInitialized = 0,  // final state
+    kRunning = 1,
+    kUninitialized = -1,  // initial state
+  };
+  std::atomic<int> visit_status;
+  int num_deps;
+  void (*init_func)();
+  // This is followed by an array  of num_deps
+  // const SCCInfoBase* deps[];
+};
+
+template <int N>
+struct SCCInfo {
+  SCCInfoBase base;
+  // Semantically this is const SCCInfo<T>* which is is a templated type.
+  // The obvious inheriting from SCCInfoBase mucks with struct initialization.
+  // Attempts showed the compiler was generating dynamic initialization code.
+  // Zero length arrays produce warnings with MSVC.
+  SCCInfoBase* deps[N ? N : 1];
+};
+
+LIBPROTOBUF_EXPORT void InitSCCImpl(SCCInfoBase* scc);
+
+inline void InitSCC(SCCInfoBase* scc) {
+  auto status = scc->visit_status.load(std::memory_order_acquire);
+  if (GOOGLE_PREDICT_FALSE(status != SCCInfoBase::kInitialized)) InitSCCImpl(scc);
 }
 
 }  // namespace internal
diff --git a/src/google/protobuf/has_bits.h b/src/google/protobuf/has_bits.h
index cb1d7ccc..e3a0149a 100644
--- a/src/google/protobuf/has_bits.h
+++ b/src/google/protobuf/has_bits.h
@@ -32,6 +32,7 @@
 #define GOOGLE_PROTOBUF_HAS_BITS_H__
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/port.h>
 
 namespace google {
 namespace protobuf {
@@ -40,17 +41,18 @@ namespace internal {
 template<size_t doublewords>
 class HasBits {
  public:
-  HasBits() GOOGLE_ATTRIBUTE_ALWAYS_INLINE { Clear(); }
+  HasBits() GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE { Clear(); }
 
-  void Clear() GOOGLE_ATTRIBUTE_ALWAYS_INLINE {
+  void Clear() GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
     memset(has_bits_, 0, sizeof(has_bits_));
   }
 
-  ::google::protobuf::uint32& operator[](int index) GOOGLE_ATTRIBUTE_ALWAYS_INLINE {
+  ::google::protobuf::uint32& operator[](int index) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
     return has_bits_[index];
   }
 
-  const ::google::protobuf::uint32& operator[](int index) const GOOGLE_ATTRIBUTE_ALWAYS_INLINE {
+  const ::google::protobuf::uint32& operator[](int index) const
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
     return has_bits_[index];
   }
 
diff --git a/src/google/protobuf/implicit_weak_message.cc b/src/google/protobuf/implicit_weak_message.cc
new file mode 100644
index 00000000..7a1d4446
--- /dev/null
+++ b/src/google/protobuf/implicit_weak_message.cc
@@ -0,0 +1,63 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/implicit_weak_message.h>
+
+#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
+#include <google/protobuf/wire_format_lite.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+bool ImplicitWeakMessage::MergePartialFromCodedStream(io::CodedInputStream* input) {
+  io::StringOutputStream string_stream(&data_);
+  io::CodedOutputStream coded_stream(&string_stream, false);
+  return WireFormatLite::SkipMessage(input, &coded_stream);
+}
+
+::google::protobuf::internal::ExplicitlyConstructed<ImplicitWeakMessage>
+    implicit_weak_message_default_instance;
+GOOGLE_PROTOBUF_DECLARE_ONCE(implicit_weak_message_once_init_);
+
+void InitImplicitWeakMessageDefaultInstance() {
+  implicit_weak_message_default_instance.DefaultConstruct();
+}
+
+const ImplicitWeakMessage* ImplicitWeakMessage::default_instance() {
+  ::google::protobuf::GoogleOnceInit(&implicit_weak_message_once_init_,
+                 &InitImplicitWeakMessageDefaultInstance);
+  return &implicit_weak_message_default_instance.get();
+}
+
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/implicit_weak_message.h b/src/google/protobuf/implicit_weak_message.h
new file mode 100644
index 00000000..3279bd17
--- /dev/null
+++ b/src/google/protobuf/implicit_weak_message.h
@@ -0,0 +1,135 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
+#define GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
+
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/message_lite.h>
+
+// This file is logically internal-only and should only be used by protobuf
+// generated code.
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+// An implementation of MessageLite that treats all data as unknown. This type
+// acts as a placeholder for an implicit weak field in the case where the true
+// message type does not get linked into the binary.
+class LIBPROTOBUF_EXPORT ImplicitWeakMessage : public MessageLite {
+ public:
+  ImplicitWeakMessage() : arena_(NULL) {}
+  explicit ImplicitWeakMessage(Arena* arena) : arena_(arena) {}
+
+  static const ImplicitWeakMessage* default_instance();
+
+  string GetTypeName() const { return ""; }
+
+  MessageLite* New() const { return new ImplicitWeakMessage; }
+  MessageLite* New(Arena* arena) const {
+    return Arena::CreateMessage<ImplicitWeakMessage>(arena);
+  }
+
+  Arena* GetArena() const { return arena_; }
+
+  void Clear() { data_.clear(); }
+
+  bool IsInitialized() const { return true; }
+
+  void CheckTypeAndMergeFrom(const MessageLite& other) {
+    data_.append(static_cast<const ImplicitWeakMessage&>(other).data_);
+  }
+
+  bool MergePartialFromCodedStream(io::CodedInputStream* input);
+
+  size_t ByteSizeLong() const { return data_.size(); }
+
+  void SerializeWithCachedSizes(io::CodedOutputStream* output) const {
+    output->WriteString(data_);
+  }
+
+  int GetCachedSize() const { return static_cast<int>(data_.size()); }
+
+  typedef void InternalArenaConstructable_;
+
+ private:
+  Arena* const arena_;
+  string data_;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImplicitWeakMessage);
+};
+
+// A type handler for use with implicit weak repeated message fields.
+template <typename ImplicitWeakType>
+class ImplicitWeakTypeHandler {
+ public:
+  typedef ImplicitWeakType Type;
+  typedef ::google::protobuf::MessageLite WeakType;
+  static const bool Moveable = false;
+
+  // With implicit weak fields, we need separate NewFromPrototype and
+  // NewFromPrototypeWeak functions. The former is used when we want to create a
+  // strong dependency on the message type, and it just delegates to the
+  // GenericTypeHandler. The latter avoids creating a strong dependency, by
+  // simply calling MessageLite::New.
+  static inline ::google::protobuf::MessageLite* NewFromPrototype(
+      const ::google::protobuf::MessageLite* prototype, ::google::protobuf::Arena* arena = NULL) {
+    return prototype->New(arena);
+  }
+
+  static inline void Delete(::google::protobuf::MessageLite* value, Arena* arena) {
+    if (arena == NULL) {
+      delete value;
+    }
+  }
+  static inline ::google::protobuf::Arena* GetArena(::google::protobuf::MessageLite* value) {
+    return value->GetArena();
+  }
+  static inline void* GetMaybeArenaPointer(::google::protobuf::MessageLite* value) {
+    return value->GetArena();
+  }
+  static inline void Clear(::google::protobuf::MessageLite* value) {
+    value->Clear();
+  }
+  static void Merge(const ::google::protobuf::MessageLite& from,
+                    ::google::protobuf::MessageLite* to) {
+    to->CheckTypeAndMergeFrom(from);
+  }
+  static inline size_t SpaceUsedLong(const Type& value) {
+    return value.SpaceUsedLong();
+  }
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
diff --git a/src/google/protobuf/inlined_string_field.h b/src/google/protobuf/inlined_string_field.h
new file mode 100644
index 00000000..95d4687b
--- /dev/null
+++ b/src/google/protobuf/inlined_string_field.h
@@ -0,0 +1,271 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
+#define GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
+
+#include <string>
+
+#include <google/protobuf/stubs/port.h>
+#include <google/protobuf/stubs/stringpiece.h>
+
+namespace google {
+namespace protobuf {
+
+class Arena;
+
+namespace internal {
+
+// InlinedStringField wraps a ::std::string instance and exposes an API similar to
+// ArenaStringPtr's wrapping of a ::std::string* instance.  As ::std::string is never
+// allocated on the Arena, we expose only the *NoArena methods of
+// ArenaStringPtr.
+//
+// default_value parameters are taken for consistency with ArenaStringPtr, but
+// are not used for most methods.  With inlining, these should be removed from
+// the generated binary.
+class LIBPROTOBUF_EXPORT InlinedStringField {
+ public:
+  InlinedStringField()
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+  explicit InlinedStringField(const ::std::string& default_value);
+
+  void AssignWithDefault(const ::std::string* default_value,
+                         const InlinedStringField& from)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  void ClearToEmpty(const ::std::string* default_value, Arena* arena)
+      GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    ClearToEmptyNoArena(default_value);
+  }
+  void ClearNonDefaultToEmpty() GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    ClearNonDefaultToEmptyNoArena();
+  }
+  void ClearToEmptyNoArena(const ::std::string* default_value)
+      GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    ClearNonDefaultToEmptyNoArena();
+  }
+  void ClearNonDefaultToEmptyNoArena()
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  void ClearToDefault(const ::std::string* default_value, Arena* arena)
+      GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    ClearToDefaultNoArena(default_value);
+  }
+  void ClearToDefaultNoArena(const ::std::string* default_value)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  void Destroy(const ::std::string* default_value, Arena* arena)
+      GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    DestroyNoArena(default_value);
+  }
+  void DestroyNoArena(const ::std::string* default_value)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  const ::std::string& Get() const GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    return GetNoArena();
+  }
+  const ::std::string& GetNoArena() const GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  ::std::string* Mutable(const ::std::string* default_value, Arena* arena)
+      GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    return MutableNoArena(default_value);
+  }
+  ::std::string* MutableNoArena(const ::std::string* default_value)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  ::std::string* Release(const ::std::string* default_value, Arena* arena) {
+    return ReleaseNoArena(default_value);
+  }
+  ::std::string* ReleaseNonDefault(const ::std::string* default_value, Arena* arena) {
+    return ReleaseNonDefaultNoArena(default_value);
+  }
+  ::std::string* ReleaseNoArena(const ::std::string* default_value) {
+    return ReleaseNonDefaultNoArena(default_value);
+  }
+  ::std::string* ReleaseNonDefaultNoArena(const ::std::string* default_value);
+
+  void Set(const ::std::string* default_value,
+           StringPiece value,
+           Arena* arena) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    SetNoArena(default_value, value);
+  }
+  void SetLite(const ::std::string* default_value,
+               StringPiece value,
+               Arena* arena) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    SetNoArena(default_value, value);
+  }
+  void SetNoArena(const ::std::string* default_value,
+                  StringPiece value) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+  void Set(const ::std::string* default_value,
+           const ::std::string& value,
+           Arena* arena) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    SetNoArena(default_value, value);
+  }
+  void SetLite(const ::std::string* default_value,
+               const ::std::string& value,
+               Arena* arena) GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE {
+    SetNoArena(default_value, value);
+  }
+  void SetNoArena(const ::std::string* default_value,
+                  const ::std::string& value)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+
+#if LANG_CXX11
+  void SetNoArena(const ::std::string* default_value,
+                  ::std::string&& value)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+#endif
+  void SetAllocated(const ::std::string* default_value,
+                    ::std::string* value,
+                    Arena* arena) {
+    SetAllocatedNoArena(default_value, value);
+  }
+  void SetAllocatedNoArena(const ::std::string* default_value,
+                           ::std::string* value);
+  void Swap(InlinedStringField* from)
+    GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE;
+  ::std::string* UnsafeMutablePointer();
+  void UnsafeSetDefault(const ::std::string* default_value);
+  ::std::string* UnsafeArenaRelease(const ::std::string* default_value, Arena* arena);
+  void UnsafeArenaSetAllocated(
+      const ::std::string* default_value, ::std::string* value, Arena* arena);
+
+  bool IsDefault(const ::std::string* default_value) {
+    return false;
+  }
+ private:
+  ::std::string value_;
+};
+
+inline InlinedStringField::InlinedStringField() {}
+
+inline InlinedStringField::InlinedStringField(const ::std::string& default_value) :
+  value_(default_value) {}
+
+inline void InlinedStringField::AssignWithDefault(
+    const ::std::string* default_value, const InlinedStringField& from) {
+  value_ = from.value_;
+}
+
+inline const ::std::string& InlinedStringField::GetNoArena() const {
+  return value_;
+}
+
+inline ::std::string* InlinedStringField::MutableNoArena(const ::std::string*) {
+  return &value_;
+}
+
+inline void InlinedStringField::SetAllocatedNoArena(
+    const ::std::string* default_value, ::std::string* value) {
+  if (value == NULL) {
+    value_.assign(*default_value);
+  } else {
+#if LANG_CXX11
+    value_.assign(std::move(*value));
+#else
+    value_.swap(*value);
+#endif
+    delete value;
+  }
+}
+
+inline void InlinedStringField::DestroyNoArena(const ::std::string*) {
+  // This is invoked from the generated message's ArenaDtor, which is used to
+  // clean up objects not allocated on the Arena.
+  this->~InlinedStringField();
+}
+
+inline void InlinedStringField::ClearNonDefaultToEmptyNoArena() {
+  value_.clear();
+}
+
+inline void InlinedStringField::ClearToDefaultNoArena(
+    const ::std::string* default_value) {
+  value_.assign(*default_value);
+}
+
+inline ::std::string* InlinedStringField::ReleaseNonDefaultNoArena(
+    const ::std::string* default_value) {
+  ::std::string* released = new ::std::string(*default_value);
+  value_.swap(*released);
+  return released;
+}
+
+inline void InlinedStringField::SetNoArena(
+    const ::std::string* default_value, StringPiece value) {
+  value_.assign(value.data(), value.length());
+}
+
+inline void InlinedStringField::SetNoArena(
+    const ::std::string* default_value, const ::std::string& value) {
+  value_.assign(value);
+}
+
+#if LANG_CXX11
+inline void InlinedStringField::SetNoArena(
+    const ::std::string* default_value, ::std::string&& value) {
+  value_.assign(std::move(value));
+}
+#endif
+
+inline void InlinedStringField::Swap(InlinedStringField* from) {
+  value_.swap(from->value_);
+}
+
+inline ::std::string* InlinedStringField::UnsafeMutablePointer() {
+  return &value_;
+}
+
+inline void InlinedStringField::UnsafeSetDefault(
+    const ::std::string* default_value) {
+  value_.assign(*default_value);
+}
+
+inline ::std::string* InlinedStringField::UnsafeArenaRelease(
+    const ::std::string* default_value, Arena* arena) {
+  return ReleaseNoArena(default_value);
+}
+
+inline void InlinedStringField::UnsafeArenaSetAllocated(
+    const ::std::string* default_value, ::std::string* value, Arena* arena) {
+  if (value == NULL) {
+    value_.assign(*default_value);
+  } else {
+    value_.assign(*value);
+  }
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
diff --git a/src/google/protobuf/io/coded_stream.cc b/src/google/protobuf/io/coded_stream.cc
index 3c2e0fbd..0851ff0c 100644
--- a/src/google/protobuf/io/coded_stream.cc
+++ b/src/google/protobuf/io/coded_stream.cc
@@ -76,10 +76,6 @@ CodedInputStream::~CodedInputStream() {
   if (input_ != NULL) {
     BackUpInputToCurrentPosition();
   }
-
-  if (total_bytes_warning_threshold_ == -2) {
-    GOOGLE_LOG(WARNING) << "The total number of bytes read was " << total_bytes_read_;
-  }
 }
 
 // Static.
@@ -123,21 +119,15 @@ CodedInputStream::Limit CodedInputStream::PushLimit(int byte_limit) {
   Limit old_limit = current_limit_;
 
   // security: byte_limit is possibly evil, so check for negative values
-  // and overflow.
-  if (byte_limit >= 0 &&
-      byte_limit <= INT_MAX - current_position) {
+  // and overflow. Also check that the new requested limit is before the
+  // previous limit; otherwise we continue to enforce the previous limit.
+  if (GOOGLE_PREDICT_TRUE(byte_limit >= 0 &&
+                        byte_limit <= INT_MAX - current_position &&
+                        byte_limit < current_limit_ - current_position)) {
     current_limit_ = current_position + byte_limit;
-  } else {
-    // Negative or overflow.
-    current_limit_ = INT_MAX;
+    RecomputeBufferLimits();
   }
 
-  // We need to enforce all limits, not just the new one, so if the previous
-  // limit was before the new requested limit, we continue to enforce the
-  // previous limit.
-  current_limit_ = std::min(current_limit_, old_limit);
-
-  RecomputeBufferLimits();
   return old_limit;
 }
 
@@ -183,18 +173,11 @@ int CodedInputStream::BytesUntilLimit() const {
   return current_limit_ - current_position;
 }
 
-void CodedInputStream::SetTotalBytesLimit(
-    int total_bytes_limit, int warning_threshold) {
+void CodedInputStream::SetTotalBytesLimit(int total_bytes_limit) {
   // Make sure the limit isn't already past, since this could confuse other
   // code.
   int current_position = CurrentPosition();
   total_bytes_limit_ = std::max(current_position, total_bytes_limit);
-  if (warning_threshold >= 0) {
-    total_bytes_warning_threshold_ = warning_threshold;
-  } else {
-    // warning_threshold is negative
-    total_bytes_warning_threshold_ = -1;
-  }
   RecomputeBufferLimits();
 }
 
@@ -211,17 +194,7 @@ void CodedInputStream::PrintTotalBytesLimitError() {
                 "in google/protobuf/io/coded_stream.h.";
 }
 
-bool CodedInputStream::Skip(int count) {
-  if (count < 0) return false;  // security: count is often user-supplied
-
-  const int original_buffer_size = BufferSize();
-
-  if (count <= original_buffer_size) {
-    // Just skipping within the current buffer.  Easy.
-    Advance(count);
-    return true;
-  }
-
+bool CodedInputStream::SkipFallback(int count, int original_buffer_size) {
   if (buffer_size_after_limit_ > 0) {
     // We hit a limit inside this buffer.  Advance to the limit and fail.
     Advance(original_buffer_size);
@@ -244,8 +217,12 @@ bool CodedInputStream::Skip(int count) {
     return false;
   }
 
+  if (!input_->Skip(count)) {
+    total_bytes_read_ = input_->ByteCount();
+    return false;
+  }
   total_bytes_read_ += count;
-  return input_->Skip(count);
+  return true;
 }
 
 bool CodedInputStream::GetDirectBufferPointer(const void** data, int* size) {
@@ -339,7 +316,8 @@ namespace {
 // The first part of the pair is true iff the read was successful.  The second
 // part is buffer + (number of bytes read).  This function is always inlined,
 // so returning a pair is costless.
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE ::std::pair<bool, const uint8*> ReadVarint32FromArray(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+::std::pair<bool, const uint8*> ReadVarint32FromArray(
     uint32 first_byte, const uint8* buffer,
     uint32* value);
 inline ::std::pair<bool, const uint8*> ReadVarint32FromArray(
@@ -376,8 +354,8 @@ inline ::std::pair<bool, const uint8*> ReadVarint32FromArray(
   return std::make_pair(true, ptr);
 }
 
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE::std::pair<bool, const uint8*> ReadVarint64FromArray(
-    const uint8* buffer, uint64* value);
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE::std::pair<bool, const uint8*>
+ReadVarint64FromArray(const uint8* buffer, uint64* value);
 inline ::std::pair<bool, const uint8*> ReadVarint64FromArray(
     const uint8* buffer, uint64* value) {
   const uint8* ptr = buffer;
@@ -605,20 +583,6 @@ bool CodedInputStream::Refresh() {
     return false;
   }
 
-  if (total_bytes_warning_threshold_ >= 0 &&
-      total_bytes_read_ >= total_bytes_warning_threshold_) {
-      GOOGLE_LOG(INFO) << "Reading dangerously large protocol message.  If the "
-                   "message turns out to be larger than "
-                << total_bytes_limit_ << " bytes, parsing will be halted "
-                   "for security reasons.  To increase the limit (or to "
-                   "disable these warnings), see "
-                   "CodedInputStream::SetTotalBytesLimit() in "
-                   "google/protobuf/io/coded_stream.h.";
-
-    // Don't warn again for this stream, and print total size at the end.
-    total_bytes_warning_threshold_ = -2;
-  }
-
   const void* void_buffer;
   int buffer_size;
   if (NextNonEmpty(input_, &void_buffer, &buffer_size)) {
@@ -655,23 +619,11 @@ bool CodedInputStream::Refresh() {
 
 // CodedOutputStream =================================================
 
-bool CodedOutputStream::default_serialization_deterministic_ = false;
+std::atomic<bool> CodedOutputStream::default_serialization_deterministic_{
+    false};
 
 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output)
-  : output_(output),
-    buffer_(NULL),
-    buffer_size_(0),
-    total_bytes_(0),
-    had_error_(false),
-    aliasing_enabled_(false),
-    serialization_deterministic_is_overridden_(false) {
-  // Eagerly Refresh() so buffer space is immediately available.
-  Refresh();
-  // The Refresh() may have failed. If the client doesn't write any data,
-  // though, don't consider this an error. If the client does write data, then
-  // another Refresh() will be attempted and it will set the error once again.
-  had_error_ = false;
-}
+    : CodedOutputStream(output, true) {}
 
 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output,
                                      bool do_eager_refresh)
@@ -681,7 +633,7 @@ CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output,
     total_bytes_(0),
     had_error_(false),
     aliasing_enabled_(false),
-    serialization_deterministic_is_overridden_(false) {
+    is_serialization_deterministic_(IsDefaultSerializationDeterministic()) {
   if (do_eager_refresh) {
     // Eagerly Refresh() so buffer space is immediately available.
     Refresh();
diff --git a/src/google/protobuf/io/coded_stream.h b/src/google/protobuf/io/coded_stream.h
index b71b4a98..0f70ecde 100644
--- a/src/google/protobuf/io/coded_stream.h
+++ b/src/google/protobuf/io/coded_stream.h
@@ -110,6 +110,7 @@
 #define GOOGLE_PROTOBUF_IO_CODED_STREAM_H__
 
 #include <assert.h>
+#include <atomic>
 #include <climits>
 #include <string>
 #include <utility>
@@ -132,6 +133,8 @@
   #endif
 #endif
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/port.h>
+#include <google/protobuf/stubs/port.h>
 
 namespace google {
 
@@ -182,7 +185,7 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
 
   // Skips a number of bytes.  Returns false if an underlying read error
   // occurs.
-  bool Skip(int count);
+  inline bool Skip(int count);
 
   // Sets *data to point directly at the unread part of the CodedInputStream's
   // underlying buffer, and *size to the size of that buffer, but does not
@@ -195,28 +198,23 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
 
   // Like GetDirectBufferPointer, but this method is inlined, and does not
   // attempt to Refresh() if the buffer is currently empty.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void GetDirectBufferPointerInline(const void** data,
-                                                            int* size);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  void GetDirectBufferPointerInline(const void** data, int* size);
 
   // Read raw bytes, copying them into the given buffer.
   bool ReadRaw(void* buffer, int size);
 
   // Like the above, with inlined optimizations. This should only be used
   // by the protobuf implementation.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InternalReadRawInline(void* buffer, int size);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  bool InternalReadRawInline(void* buffer, int size);
 
   // Like ReadRaw, but reads into a string.
-  //
-  // Implementation Note:  ReadString() grows the string gradually as it
-  // reads in the data, rather than allocating the entire requested size
-  // upfront.  This prevents denial-of-service attacks in which a client
-  // could claim that a string is going to be MAX_INT bytes long in order to
-  // crash the server because it can't allocate this much space at once.
   bool ReadString(string* buffer, int size);
   // Like the above, with inlined optimizations. This should only be used
   // by the protobuf implementation.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InternalReadStringInline(string* buffer,
-                                                        int size);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  bool InternalReadStringInline(string* buffer, int size);
 
 
   // Read a 32-bit little-endian integer.
@@ -259,8 +257,11 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   // Always inline because this is only called in one place per parse loop
   // but it is called for every iteration of said loop, so it should be fast.
   // GCC doesn't want to inline this by default.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE uint32 ReadTag();
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE uint32 ReadTagNoLastTag();
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE uint32 ReadTag() {
+    return last_tag_ = ReadTagNoLastTag();
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE uint32 ReadTagNoLastTag();
 
 
   // This usually a faster alternative to ReadTag() when cutoff is a manifest
@@ -271,10 +272,15 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   // above cutoff or is 0.  (There's intentional wiggle room when tag is 0,
   // because that can arise in several ways, and for best performance we want
   // to avoid an extra "is tag == 0?" check here.)
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE std::pair<uint32, bool> ReadTagWithCutoff(
-      uint32 cutoff);
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE std::pair<uint32, bool> ReadTagWithCutoffNoLastTag(
-      uint32 cutoff);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  std::pair<uint32, bool> ReadTagWithCutoff(uint32 cutoff) {
+    std::pair<uint32, bool> result = ReadTagWithCutoffNoLastTag(cutoff);
+    last_tag_ = result.first;
+    return result;
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  std::pair<uint32, bool> ReadTagWithCutoffNoLastTag(uint32 cutoff);
 
   // Usually returns true if calling ReadVarint32() now would produce the given
   // value.  Will always return false if ReadVarint32() would not return the
@@ -283,7 +289,7 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   // parameter.
   // Always inline because this collapses to a small number of instructions
   // when given a constant parameter, but GCC doesn't want to inline by default.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool ExpectTag(uint32 expected);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool ExpectTag(uint32 expected);
 
   // Like above, except this reads from the specified buffer. The caller is
   // responsible for ensuring that the buffer is large enough to read a varint
@@ -292,9 +298,8 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   //
   // Returns a pointer beyond the expected tag if it was found, or NULL if it
   // was not.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static const uint8* ExpectTagFromArray(
-      const uint8* buffer,
-      uint32 expected);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  static const uint8* ExpectTagFromArray(const uint8* buffer, uint32 expected);
 
   // Usually returns true if no more bytes can be read.  Always returns false
   // if more bytes can be read.  If ExpectAtEnd() returns true, a subsequent
@@ -314,6 +319,7 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   // tag to make sure it had the right number, so it calls LastTagWas() on
   // return from the embedded parser to check.
   bool LastTagWas(uint32 expected);
+  void SetLastTag(uint32 tag) { last_tag_ = tag; }
 
   // When parsing message (but NOT a group), this method must be called
   // immediately after MergeFromCodedStream() returns (if it returns true)
@@ -361,43 +367,32 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
 
   // Total Bytes Limit -----------------------------------------------
   // To prevent malicious users from sending excessively large messages
-  // and causing integer overflows or memory exhaustion, CodedInputStream
-  // imposes a hard limit on the total number of bytes it will read.
+  // and causing memory exhaustion, CodedInputStream imposes a hard limit on
+  // the total number of bytes it will read.
 
   // Sets the maximum number of bytes that this CodedInputStream will read
-  // before refusing to continue.  To prevent integer overflows in the
-  // protocol buffers implementation, as well as to prevent servers from
-  // allocating enormous amounts of memory to hold parsed messages, the
-  // maximum message length should be limited to the shortest length that
-  // will not harm usability.  The theoretical shortest message that could
-  // cause integer overflows is 512MB.  The default limit is 64MB.  Apps
-  // should set shorter limits if possible.  If warning_threshold is not -1,
-  // a warning will be printed to stderr after warning_threshold bytes are
-  // read.  For backwards compatibility all negative values get squashed to -1,
-  // as other negative values might have special internal meanings.
-  // An error will always be printed to stderr if the limit is reached.
+  // before refusing to continue.  To prevent servers from allocating enormous
+  // amounts of memory to hold parsed messages, the maximum message length
+  // should be limited to the shortest length that will not harm usability.
+  // The default limit is INT_MAX (~2GB) and apps should set shorter limits
+  // if possible. An error will always be printed to stderr if the limit is
+  // reached.
   //
-  // This is unrelated to PushLimit()/PopLimit().
+  // Note: setting a limit less than the current read position is interpreted
+  // as a limit on the current position.
   //
-  // Hint:  If you are reading this because your program is printing a
-  //   warning about dangerously large protocol messages, you may be
-  //   confused about what to do next.  The best option is to change your
-  //   design such that excessively large messages are not necessary.
-  //   For example, try to design file formats to consist of many small
-  //   messages rather than a single large one.  If this is infeasible,
-  //   you will need to increase the limit.  Chances are, though, that
-  //   your code never constructs a CodedInputStream on which the limit
-  //   can be set.  You probably parse messages by calling things like
-  //   Message::ParseFromString().  In this case, you will need to change
-  //   your code to instead construct some sort of ZeroCopyInputStream
-  //   (e.g. an ArrayInputStream), construct a CodedInputStream around
-  //   that, then call Message::ParseFromCodedStream() instead.  Then
-  //   you can adjust the limit.  Yes, it's more work, but you're doing
-  //   something unusual.
-  void SetTotalBytesLimit(int total_bytes_limit, int warning_threshold);
-
-  // The Total Bytes Limit minus the Current Position, or -1 if there
-  // is no Total Bytes Limit.
+  // This is unrelated to PushLimit()/PopLimit().
+  void SetTotalBytesLimit(int total_bytes_limit);
+
+  PROTOBUF_RUNTIME_DEPRECATED(
+      "Please use the single parameter version of SetTotalBytesLimit(). The "
+      "second parameter is ignored.")
+  void SetTotalBytesLimit(int total_bytes_limit, int) {
+    SetTotalBytesLimit(total_bytes_limit);
+  }
+
+  // The Total Bytes Limit minus the Current Position, or -1 if the total bytes
+  // limit is INT_MAX.
   int BytesUntilTotalBytesLimit() const;
 
   // Recursion Limit -------------------------------------------------
@@ -568,12 +563,6 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   // current_limit_.  Set using SetTotalBytesLimit().
   int total_bytes_limit_;
 
-  // If positive/0: Limit for bytes read after which a warning due to size
-  // should be logged.
-  // If -1: Printing of warning disabled. Can be set by client.
-  // If -2: Internal: Limit has been reached, print full size when destructing.
-  int total_bytes_warning_threshold_;
-
   // Current recursion budget, controlled by IncrementRecursionDepth() and
   // similar.  Starts at recursion_limit_ and goes down: if this reaches
   // -1 we are over budget.
@@ -587,6 +576,9 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
 
   // Private member functions.
 
+  // Fallback when Skip() goes past the end of the current buffer.
+  bool SkipFallback(int count, int original_buffer_size);
+
   // Advance the buffer by a given number of bytes.
   void Advance(int amount);
 
@@ -624,12 +616,6 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
   bool ReadLittleEndian32Fallback(uint32* value);
   bool ReadLittleEndian64Fallback(uint64* value);
 
-  template<bool update_last_tag>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE uint32 ReadTagImplementation();
-  template<bool update_last_tag>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  std::pair<uint32, bool> ReadTagWithCutoffImplementation(uint32 cutoff);
-
   // Fallback/slow methods for reading tags. These do not update last_tag_,
   // but will set legitimate_message_end_ if we are at the end of the input
   // stream.
@@ -642,8 +628,6 @@ class LIBPROTOBUF_EXPORT CodedInputStream {
 
   static const int kDefaultTotalBytesLimit = INT_MAX;
 
-  static const int kDefaultTotalBytesWarningThreshold = 32 << 20;  // 32MB
-
   static int default_recursion_limit_;  // 100 by default.
 };
 
@@ -798,8 +782,8 @@ class LIBPROTOBUF_EXPORT CodedOutputStream {
   // but GCC by default doesn't want to inline this.
   void WriteTag(uint32 value);
   // Like WriteTag()  but writing directly to the target array.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE static uint8* WriteTagToArray(uint32 value,
-                                                        uint8* target);
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  static uint8* WriteTagToArray(uint32 value, uint8* target);
 
   // Returns the number of bytes needed to encode the given value as a varint.
   static size_t VarintSize32(uint32 value);
@@ -845,7 +829,7 @@ class LIBPROTOBUF_EXPORT CodedOutputStream {
   // canonicalization specification and implement the serializer using
   // reflection APIs rather than relying on this API.
   //
-  // If determinisitc serialization is requested, the serializer will
+  // If deterministic serialization is requested, the serializer will
   // sort map entries by keys in lexicographical order or numerical order.
   // (This is an implementation detail and may subject to change.)
   //
@@ -856,21 +840,18 @@ class LIBPROTOBUF_EXPORT CodedOutputStream {
   // Otherwise, SetSerializationDeterministic has been called, and the last
   // value passed to it is all that matters.
   void SetSerializationDeterministic(bool value) {
-    serialization_deterministic_is_overridden_ = true;
-    serialization_deterministic_override_ = value;
+    is_serialization_deterministic_ = value;
   }
   // See above.  Also, note that users of this CodedOutputStream may need to
   // call IsSerializationDeterministic() to serialize in the intended way.  This
   // CodedOutputStream cannot enforce a desire for deterministic serialization
   // by itself.
   bool IsSerializationDeterministic() const {
-    return serialization_deterministic_is_overridden_ ?
-        serialization_deterministic_override_ :
-        default_serialization_deterministic_;
+    return is_serialization_deterministic_;
   }
 
   static bool IsDefaultSerializationDeterministic() {
-    return default_serialization_deterministic_;
+    return default_serialization_deterministic_.load(std::memory_order_relaxed) != 0;
   }
 
  private:
@@ -882,10 +863,8 @@ class LIBPROTOBUF_EXPORT CodedOutputStream {
   int total_bytes_;  // Sum of sizes of all buffers seen so far.
   bool had_error_;   // Whether an error occurred during output.
   bool aliasing_enabled_;  // See EnableAliasing().
-  // See SetSerializationDeterministic() regarding these three fields.
-  bool serialization_deterministic_is_overridden_;
-  bool serialization_deterministic_override_;
-  static bool default_serialization_deterministic_;
+  bool is_serialization_deterministic_;
+  static std::atomic<bool> default_serialization_deterministic_;
 
   // Advance the buffer by a given number of bytes.
   void Advance(int amount);
@@ -904,10 +883,15 @@ class LIBPROTOBUF_EXPORT CodedOutputStream {
   void WriteVarint64SlowPath(uint64 value);
 
   // See above.  Other projects may use "friend" to allow them to call this.
-  // Requires: no protocol buffer serialization in progress.
+  // After SetDefaultSerializationDeterministic() completes, all protocol
+  // buffer serializations will be deterministic by default.  Thread safe.
+  // However, the meaning of "after" is subtle here: to be safe, each thread
+  // that wants deterministic serialization by default needs to call
+  // SetDefaultSerializationDeterministic() or ensure on its own that another
+  // thread has done so.
   friend void ::google::protobuf::internal::MapTestForceDeterministic();
   static void SetDefaultSerializationDeterministic() {
-    default_serialization_deterministic_ = true;
+    default_serialization_deterministic_.store(true, std::memory_order_relaxed);
   }
 };
 
@@ -1017,48 +1001,21 @@ inline bool CodedInputStream::ReadLittleEndian64(uint64* value) {
 #endif
 }
 
-inline uint32 CodedInputStream::ReadTag() {
-  return ReadTagImplementation<true>();
-}
-
 inline uint32 CodedInputStream::ReadTagNoLastTag() {
-  return ReadTagImplementation<false>();
-}
-
-template<bool update_last_tag>
-inline uint32 CodedInputStream::ReadTagImplementation() {
   uint32 v = 0;
   if (GOOGLE_PREDICT_TRUE(buffer_ < buffer_end_)) {
     v = *buffer_;
     if (v < 0x80) {
-      if (update_last_tag) {
-        last_tag_ = v;
-      }
       Advance(1);
       return v;
     }
   }
   v = ReadTagFallback(v);
-  if (update_last_tag) {
-    last_tag_ = v;
-  }
   return v;
 }
 
-inline std::pair<uint32, bool> CodedInputStream::ReadTagWithCutoff(
-    uint32 cutoff) {
-  return ReadTagWithCutoffImplementation<true>(cutoff);
-}
-
 inline std::pair<uint32, bool> CodedInputStream::ReadTagWithCutoffNoLastTag(
     uint32 cutoff) {
-  return ReadTagWithCutoffImplementation<false>(cutoff);
-}
-
-template<bool update_last_tag>
-inline std::pair<uint32, bool>
-CodedInputStream::ReadTagWithCutoffImplementation(
-    uint32 cutoff) {
   // In performance-sensitive code we can expect cutoff to be a compile-time
   // constant, and things like "cutoff >= kMax1ByteVarint" to be evaluated at
   // compile time.
@@ -1071,23 +1028,16 @@ CodedInputStream::ReadTagWithCutoffImplementation(
     if (static_cast<int8>(buffer_[0]) > 0) {
       const uint32 kMax1ByteVarint = 0x7f;
       uint32 tag = buffer_[0];
-      if (update_last_tag) {
-        last_tag_ = tag;
-      }
       Advance(1);
       return std::make_pair(tag, cutoff >= kMax1ByteVarint || tag <= cutoff);
     }
     // Other hot case: cutoff >= 0x80, buffer_ has at least two bytes available,
     // and tag is two bytes.  The latter is tested by bitwise-and-not of the
     // first byte and the second byte.
-    if (cutoff >= 0x80 &&
-        GOOGLE_PREDICT_TRUE(buffer_ + 1 < buffer_end_) &&
+    if (cutoff >= 0x80 && GOOGLE_PREDICT_TRUE(buffer_ + 1 < buffer_end_) &&
         GOOGLE_PREDICT_TRUE((buffer_[0] & ~buffer_[1]) >= 0x80)) {
       const uint32 kMax2ByteVarint = (0x7f << 7) + 0x7f;
       uint32 tag = (1u << 7) * buffer_[1] + (buffer_[0] - 0x80);
-      if (update_last_tag) {
-        last_tag_ = tag;
-      }
       Advance(2);
       // It might make sense to test for tag == 0 now, but it is so rare that
       // that we don't bother.  A varint-encoded 0 should be one byte unless
@@ -1101,9 +1051,6 @@ CodedInputStream::ReadTagWithCutoffImplementation(
   }
   // Slow path
   const uint32 tag = ReadTagFallback(first_byte_or_zero);
-  if (update_last_tag) {
-    last_tag_ = tag;
-  }
   return std::make_pair(tag, static_cast<uint32>(tag - 1) < cutoff);
 }
 
@@ -1395,7 +1342,6 @@ inline CodedInputStream::CodedInputStream(ZeroCopyInputStream* input)
     current_limit_(kint32max),
     buffer_size_after_limit_(0),
     total_bytes_limit_(kDefaultTotalBytesLimit),
-    total_bytes_warning_threshold_(kDefaultTotalBytesWarningThreshold),
     recursion_budget_(default_recursion_limit_),
     recursion_limit_(default_recursion_limit_),
     extension_pool_(NULL),
@@ -1416,7 +1362,6 @@ inline CodedInputStream::CodedInputStream(const uint8* buffer, int size)
     current_limit_(size),
     buffer_size_after_limit_(0),
     total_bytes_limit_(kDefaultTotalBytesLimit),
-    total_bytes_warning_threshold_(kDefaultTotalBytesWarningThreshold),
     recursion_budget_(default_recursion_limit_),
     recursion_limit_(default_recursion_limit_),
     extension_pool_(NULL),
@@ -1429,11 +1374,25 @@ inline bool CodedInputStream::IsFlat() const {
   return input_ == NULL;
 }
 
+inline bool CodedInputStream::Skip(int count) {
+  if (count < 0) return false;  // security: count is often user-supplied
+
+  const int original_buffer_size = BufferSize();
+
+  if (count <= original_buffer_size) {
+    // Just skipping within the current buffer.  Easy.
+    Advance(count);
+    return true;
+  }
+
+  return SkipFallback(count, original_buffer_size);
+}
+
 }  // namespace io
 }  // namespace protobuf
 
 
-#if _MSC_VER >= 1300 && !defined(__INTEL_COMPILER)
+#if defined(_MSC_VER) && _MSC_VER >= 1300 && !defined(__INTEL_COMPILER)
   #pragma runtime_checks("c", restore)
 #endif  // _MSC_VER && !defined(__INTEL_COMPILER)
 
diff --git a/src/google/protobuf/io/coded_stream_unittest.cc b/src/google/protobuf/io/coded_stream_unittest.cc
index 31574d5b..1c8d3272 100644
--- a/src/google/protobuf/io/coded_stream_unittest.cc
+++ b/src/google/protobuf/io/coded_stream_unittest.cc
@@ -35,9 +35,6 @@
 // This file contains tests and benchmarks.
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/io/coded_stream.h>
@@ -63,6 +60,7 @@ namespace protobuf {
 namespace io {
 namespace {
 
+
 // ===================================================================
 // Data-Driven Test Infrastructure
 
@@ -736,7 +734,7 @@ TEST_F(CodedStreamTest, ReadStringImpossiblyLargeFromStringOnStack) {
 }
 
 TEST_F(CodedStreamTest, ReadStringImpossiblyLargeFromStringOnHeap) {
-  google::protobuf::scoped_array<uint8> buffer(new uint8[8]);
+  std::unique_ptr<uint8[]> buffer(new uint8[8]);
   CodedInputStream coded_input(buffer.get(), 8);
   string str;
   EXPECT_FALSE(coded_input.ReadString(&str, 1 << 30));
@@ -1296,35 +1294,6 @@ void CodedStreamTest::SetupTotalBytesLimitWarningTest(
   *out_warnings = scoped_log.GetMessages(WARNING);
 }
 
-TEST_F(CodedStreamTest, TotalBytesLimitWarning) {
-  std::vector<string> errors;
-  std::vector<string> warnings;
-  SetupTotalBytesLimitWarningTest(10240, 1024, &errors, &warnings);
-
-  EXPECT_EQ(0, errors.size());
-
-  EXPECT_EQ(1, warnings.size());
-  EXPECT_PRED_FORMAT2(testing::IsSubstring,
-    "The total number of bytes read was 2048",
-    warnings[0]);
-}
-
-TEST_F(CodedStreamTest, TotalBytesLimitWarningDisabled) {
-  std::vector<string> errors;
-  std::vector<string> warnings;
-
-  // Test with -1
-  SetupTotalBytesLimitWarningTest(10240, -1, &errors, &warnings);
-  EXPECT_EQ(0, errors.size());
-  EXPECT_EQ(0, warnings.size());
-
-  // Test again with -2, expecting the same result
-  SetupTotalBytesLimitWarningTest(10240, -2, &errors, &warnings);
-  EXPECT_EQ(0, errors.size());
-  EXPECT_EQ(0, warnings.size());
-}
-
-
 TEST_F(CodedStreamTest, RecursionLimit) {
   ArrayInputStream input(buffer_, sizeof(buffer_));
   CodedInputStream coded_input(&input);
@@ -1425,9 +1394,6 @@ TEST_F(CodedStreamTest, InputOver2G) {
   EXPECT_EQ(0, errors.size());
 }
 
-// ===================================================================
-
-
 }  // namespace
 }  // namespace io
 }  // namespace protobuf
diff --git a/src/google/protobuf/io/gzip_stream.h b/src/google/protobuf/io/gzip_stream.h
index df1a446e..15b02fe3 100644
--- a/src/google/protobuf/io/gzip_stream.h
+++ b/src/google/protobuf/io/gzip_stream.h
@@ -118,7 +118,7 @@ class LIBPROTOBUF_EXPORT GzipOutputStream : public ZeroCopyOutputStream {
     ZLIB = 2,
   };
 
-  struct LIBPROTOBUF_EXPORT Options {
+  struct Options {
     // Defaults to GZIP.
     Format format;
 
diff --git a/src/google/protobuf/io/printer.cc b/src/google/protobuf/io/printer.cc
index 99e895f5..de67cef1 100644
--- a/src/google/protobuf/io/printer.cc
+++ b/src/google/protobuf/io/printer.cc
@@ -111,6 +111,7 @@ void Printer::Print(const std::map<string, string>& variables,
   int size = strlen(text);
   int pos = 0;  // The number of bytes we've written so far.
   substitutions_.clear();
+  line_start_variables_.clear();
 
   for (int i = 0; i < size; i++) {
     if (text[i] == '\n') {
@@ -122,6 +123,7 @@ void Printer::Print(const std::map<string, string>& variables,
       // Setting this true will cause the next WriteRaw() to insert an indent
       // first.
       at_start_of_line_ = true;
+      line_start_variables_.clear();
 
     } else if (text[i] == variable_delimiter_) {
       // Saw the start of a variable name.
@@ -148,12 +150,15 @@ void Printer::Print(const std::map<string, string>& variables,
         if (iter == variables.end()) {
           GOOGLE_LOG(DFATAL) << " Undefined variable: " << varname;
         } else {
-          size_t begin = offset_;
+          if (at_start_of_line_ && iter->second.empty()) {
+            line_start_variables_.push_back(varname);
+          }
           WriteRaw(iter->second.data(), iter->second.size());
           std::pair<std::map<string, std::pair<size_t, size_t> >::iterator,
                     bool>
-              inserted = substitutions_.insert(
-                  std::make_pair(varname, std::make_pair(begin, offset_)));
+              inserted = substitutions_.insert(std::make_pair(
+                  varname,
+                  std::make_pair(offset_ - iter->second.size(), offset_)));
           if (!inserted.second) {
             // This variable was used multiple times.  Make its span have
             // negative length so we can detect it if it gets used in an
@@ -319,17 +324,38 @@ void Printer::WriteRaw(const char* data, int size) {
   if (at_start_of_line_ && (size > 0) && (data[0] != '\n')) {
     // Insert an indent.
     at_start_of_line_ = false;
-    WriteRaw(indent_.data(), indent_.size());
+    CopyToBuffer(indent_.data(), indent_.size());
     if (failed_) return;
+    // Fix up empty variables (e.g., "{") that should be annotated as
+    // coming after the indent.
+    for (std::vector<string>::iterator i = line_start_variables_.begin();
+         i != line_start_variables_.end(); ++i) {
+      substitutions_[*i].first += indent_.size();
+      substitutions_[*i].second += indent_.size();
+    }
   }
 
+  // If we're going to write any data, clear line_start_variables_, since
+  // we've either updated them in the block above or they no longer refer to
+  // the current line.
+  line_start_variables_.clear();
+
+  CopyToBuffer(data, size);
+}
+
+void Printer::CopyToBuffer(const char* data, int size) {
+  if (failed_) return;
+  if (size == 0) return;
+
   while (size > buffer_size_) {
     // Data exceeds space in the buffer.  Copy what we can and request a
     // new buffer.
-    memcpy(buffer_, data, buffer_size_);
-    offset_ += buffer_size_;
-    data += buffer_size_;
-    size -= buffer_size_;
+    if (buffer_size_ > 0) {
+      memcpy(buffer_, data, buffer_size_);
+      offset_ += buffer_size_;
+      data += buffer_size_;
+      size -= buffer_size_;
+    }
     void* void_buffer;
     failed_ = !output_->Next(&void_buffer, &buffer_size_);
     if (failed_) return;
diff --git a/src/google/protobuf/io/printer.h b/src/google/protobuf/io/printer.h
index e666445b..d11745ce 100644
--- a/src/google/protobuf/io/printer.h
+++ b/src/google/protobuf/io/printer.h
@@ -157,7 +157,7 @@ class AnnotationProtoCollector : public AnnotationCollector {
 //   vars["function"] = "call";
 //   vars["mark"] = "";
 //   printer.Print(vars, "$function$($foo$,$foo$)$mark$");
-//   printer.Annotate("function", "rmark", call_);
+//   printer.Annotate("function", "mark", call_);
 //
 // This code associates the span covering "call(bar,bar)" in the output with the
 // call_ descriptor.
@@ -311,6 +311,9 @@ class LIBPROTOBUF_EXPORT Printer {
   void Annotate(const char* begin_varname, const char* end_varname,
                 const string& file_path, const std::vector<int>& path);
 
+  // Copy size worth of bytes from data to buffer_.
+  void CopyToBuffer(const char* data, int size);
+
   const char variable_delimiter_;
 
   ZeroCopyOutputStream* const output_;
@@ -334,6 +337,11 @@ class LIBPROTOBUF_EXPORT Printer {
   // length of the substituted string).
   std::map<string, std::pair<size_t, size_t> > substitutions_;
 
+  // Keeps track of the keys in substitutions_ that need to be updated when
+  // indents are inserted. These are keys that refer to the beginning of the
+  // current line.
+  std::vector<string> line_start_variables_;
+
   // Returns true and sets range to the substitution range in the output for
   // varname if varname was used once in the last call to Print. If varname
   // was not used, or if it was used multiple times, returns false (and
diff --git a/src/google/protobuf/io/printer_unittest.cc b/src/google/protobuf/io/printer_unittest.cc
index 0435228a..d0a0ebee 100644
--- a/src/google/protobuf/io/printer_unittest.cc
+++ b/src/google/protobuf/io/printer_unittest.cc
@@ -360,6 +360,83 @@ TEST(Printer, AnnotateDespiteUnrelatedMultipleUses) {
   EXPECT_EQ(7, bar->end());
 }
 
+TEST(Printer, AnnotateIndent) {
+  char buffer[8192];
+  ArrayOutputStream output(buffer, sizeof(buffer));
+  GeneratedCodeInfo info;
+  AnnotationProtoCollector<GeneratedCodeInfo> info_collector(&info);
+  {
+    Printer printer(&output, '$', &info_collector);
+    printer.Print("0\n");
+    printer.Indent();
+    printer.Print("$foo$", "foo", "4");
+    std::vector<int> path;
+    path.push_back(44);
+    MockDescriptor descriptor("path", path);
+    printer.Annotate("foo", &descriptor);
+    printer.Print(",\n");
+    printer.Print("$bar$", "bar", "9");
+    path[0] = 99;
+    MockDescriptor descriptor_two("path", path);
+    printer.Annotate("bar", &descriptor_two);
+    printer.Print("\n${$$D$$}$\n", "{", "", "}", "", "D", "d");
+    path[0] = 1313;
+    MockDescriptor descriptor_three("path", path);
+    printer.Annotate("{", "}", &descriptor_three);
+    printer.Outdent();
+    printer.Print("\n");
+  }
+  buffer[output.ByteCount()] = '\0';
+  EXPECT_STREQ("0\n  4,\n  9\n  d\n\n", buffer);
+  ASSERT_EQ(3, info.annotation_size());
+  const GeneratedCodeInfo::Annotation* foo = &info.annotation(0);
+  ASSERT_EQ(1, foo->path_size());
+  EXPECT_EQ(44, foo->path(0));
+  EXPECT_EQ("path", foo->source_file());
+  EXPECT_EQ(4, foo->begin());
+  EXPECT_EQ(5, foo->end());
+  const GeneratedCodeInfo::Annotation* bar = &info.annotation(1);
+  ASSERT_EQ(1, bar->path_size());
+  EXPECT_EQ(99, bar->path(0));
+  EXPECT_EQ("path", bar->source_file());
+  EXPECT_EQ(9, bar->begin());
+  EXPECT_EQ(10, bar->end());
+  const GeneratedCodeInfo::Annotation* braces = &info.annotation(2);
+  ASSERT_EQ(1, braces->path_size());
+  EXPECT_EQ(1313, braces->path(0));
+  EXPECT_EQ("path", braces->source_file());
+  EXPECT_EQ(13, braces->begin());
+  EXPECT_EQ(14, braces->end());
+}
+
+TEST(Printer, AnnotateIndentNewline) {
+  char buffer[8192];
+  ArrayOutputStream output(buffer, sizeof(buffer));
+  GeneratedCodeInfo info;
+  AnnotationProtoCollector<GeneratedCodeInfo> info_collector(&info);
+  {
+    Printer printer(&output, '$', &info_collector);
+    printer.Indent();
+    printer.Print("$A$$N$$B$C\n", "A", "", "N", "\nz", "B", "");
+    std::vector<int> path;
+    path.push_back(0);
+    MockDescriptor descriptor("path", path);
+    printer.Annotate("A", "B", &descriptor);
+    printer.Outdent();
+    printer.Print("\n");
+  }
+  buffer[output.ByteCount()] = '\0';
+  EXPECT_STREQ("\nz  C\n\n", buffer);
+  ASSERT_EQ(1, info.annotation_size());
+  const GeneratedCodeInfo::Annotation* ab = &info.annotation(0);
+  ASSERT_EQ(1, ab->path_size());
+  EXPECT_EQ(0, ab->path(0));
+  EXPECT_EQ("path", ab->source_file());
+  EXPECT_EQ(0, ab->begin());
+  EXPECT_EQ(4, ab->end());
+}
+
+
 TEST(Printer, Indenting) {
   char buffer[8192];
 
diff --git a/src/google/protobuf/io/tokenizer_unittest.cc b/src/google/protobuf/io/tokenizer_unittest.cc
index cadeb696..e55288e2 100644
--- a/src/google/protobuf/io/tokenizer_unittest.cc
+++ b/src/google/protobuf/io/tokenizer_unittest.cc
@@ -341,7 +341,7 @@ inline std::ostream& operator<<(std::ostream& out,
 MultiTokenCase kMultiTokenCases[] = {
   // Test empty input.
   { "", {
-    { Tokenizer::TYPE_END       , ""     , 0,  0 },
+    { Tokenizer::TYPE_END       , ""     , 0,  0,  0 },
   }},
 
   // Test all token types at the same time.
diff --git a/src/google/protobuf/io/zero_copy_stream.cc b/src/google/protobuf/io/zero_copy_stream.cc
index 186de001..f81555e5 100644
--- a/src/google/protobuf/io/zero_copy_stream.cc
+++ b/src/google/protobuf/io/zero_copy_stream.cc
@@ -41,9 +41,6 @@ namespace google {
 namespace protobuf {
 namespace io {
 
-ZeroCopyInputStream::~ZeroCopyInputStream() {}
-ZeroCopyOutputStream::~ZeroCopyOutputStream() {}
-
 
 bool ZeroCopyOutputStream::WriteAliasedRaw(const void* /* data */,
                                            int /* size */) {
diff --git a/src/google/protobuf/io/zero_copy_stream.h b/src/google/protobuf/io/zero_copy_stream.h
index 52650fc6..62ace7ae 100644
--- a/src/google/protobuf/io/zero_copy_stream.h
+++ b/src/google/protobuf/io/zero_copy_stream.h
@@ -123,8 +123,8 @@ class ZeroCopyOutputStream;
 // copying.
 class LIBPROTOBUF_EXPORT ZeroCopyInputStream {
  public:
-  inline ZeroCopyInputStream() {}
-  virtual ~ZeroCopyInputStream();
+  ZeroCopyInputStream() {}
+  virtual ~ZeroCopyInputStream() {}
 
   // Obtains a chunk of data from the stream.
   //
@@ -180,8 +180,8 @@ class LIBPROTOBUF_EXPORT ZeroCopyInputStream {
 // copying.
 class LIBPROTOBUF_EXPORT ZeroCopyOutputStream {
  public:
-  inline ZeroCopyOutputStream() {}
-  virtual ~ZeroCopyOutputStream();
+  ZeroCopyOutputStream() {}
+  virtual ~ZeroCopyOutputStream() {}
 
   // Obtains a buffer into which data can be written.  Any data written
   // into this buffer will eventually (maybe instantly, maybe later on)
diff --git a/src/google/protobuf/io/zero_copy_stream_impl.cc b/src/google/protobuf/io/zero_copy_stream_impl.cc
index 109c55c1..dd921135 100644
--- a/src/google/protobuf/io/zero_copy_stream_impl.cc
+++ b/src/google/protobuf/io/zero_copy_stream_impl.cc
@@ -32,9 +32,7 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
-#ifdef _MSC_VER
-#include <io.h>
-#else
+#ifndef _MSC_VER
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -43,11 +41,11 @@
 #include <errno.h>
 #include <iostream>
 #include <algorithm>
-
 #include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/stl_util.h>
+#include <google/protobuf/stubs/io_win32.h>
 
 
 namespace google {
@@ -58,6 +56,13 @@ namespace io {
 // Win32 lseek is broken:  If invoked on a non-seekable file descriptor, its
 // return value is undefined.  We re-define it to always produce an error.
 #define lseek(fd, offset, origin) ((off_t)-1)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::close;
+using google::protobuf::internal::win32::open;
+using google::protobuf::internal::win32::read;
+using google::protobuf::internal::win32::write;
 #endif
 
 namespace {
@@ -81,8 +86,6 @@ FileInputStream::FileInputStream(int file_descriptor, int block_size)
     impl_(&copying_input_, block_size) {
 }
 
-FileInputStream::~FileInputStream() {}
-
 bool FileInputStream::Close() {
   return copying_input_.Close();
 }
@@ -273,8 +276,6 @@ bool FileOutputStream::CopyingFileOutputStream::Write(
 IstreamInputStream::IstreamInputStream(std::istream* input, int block_size)
     : copying_input_(input), impl_(&copying_input_, block_size) {}
 
-IstreamInputStream::~IstreamInputStream() {}
-
 bool IstreamInputStream::Next(const void** data, int* size) {
   return impl_.Next(data, size);
 }
@@ -348,9 +349,6 @@ ConcatenatingInputStream::ConcatenatingInputStream(
   : streams_(streams), stream_count_(count), bytes_retired_(0) {
 }
 
-ConcatenatingInputStream::~ConcatenatingInputStream() {
-}
-
 bool ConcatenatingInputStream::Next(const void** data, int* size) {
   while (stream_count_ > 0) {
     if (streams_[0]->Next(data, size)) return true;
diff --git a/src/google/protobuf/io/zero_copy_stream_impl.h b/src/google/protobuf/io/zero_copy_stream_impl.h
index 3365790e..ea978bfb 100644
--- a/src/google/protobuf/io/zero_copy_stream_impl.h
+++ b/src/google/protobuf/io/zero_copy_stream_impl.h
@@ -67,7 +67,6 @@ class LIBPROTOBUF_EXPORT FileInputStream : public ZeroCopyInputStream {
   // should be read and returned with each call to Next().  Otherwise,
   // a reasonable default is used.
   explicit FileInputStream(int file_descriptor, int block_size = -1);
-  ~FileInputStream();
 
   // Flushes any buffers and closes the underlying file.  Returns false if
   // an error occurs during the process; use GetErrno() to examine the error.
@@ -219,7 +218,6 @@ class LIBPROTOBUF_EXPORT IstreamInputStream : public ZeroCopyInputStream {
   // should be read and returned with each call to Next().  Otherwise,
   // a reasonable default is used.
   explicit IstreamInputStream(std::istream* stream, int block_size = -1);
-  ~IstreamInputStream();
 
   // implements ZeroCopyInputStream ----------------------------------
   bool Next(const void** data, int* size);
@@ -306,7 +304,6 @@ class LIBPROTOBUF_EXPORT ConcatenatingInputStream : public ZeroCopyInputStream {
   // All streams passed in as well as the array itself must remain valid
   // until the ConcatenatingInputStream is destroyed.
   ConcatenatingInputStream(ZeroCopyInputStream* const streams[], int count);
-  ~ConcatenatingInputStream();
 
   // implements ZeroCopyInputStream ----------------------------------
   bool Next(const void** data, int* size);
diff --git a/src/google/protobuf/io/zero_copy_stream_impl_lite.cc b/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
index e6ca88c2..66ad49bc 100644
--- a/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
+++ b/src/google/protobuf/io/zero_copy_stream_impl_lite.cc
@@ -64,9 +64,6 @@ ArrayInputStream::ArrayInputStream(const void* data, int size,
     last_returned_size_(0) {
 }
 
-ArrayInputStream::~ArrayInputStream() {
-}
-
 bool ArrayInputStream::Next(const void** data, int* size) {
   if (position_ < size_) {
     last_returned_size_ = std::min(block_size_, size_ - position_);
@@ -117,9 +114,6 @@ ArrayOutputStream::ArrayOutputStream(void* data, int size, int block_size)
     last_returned_size_(0) {
 }
 
-ArrayOutputStream::~ArrayOutputStream() {
-}
-
 bool ArrayOutputStream::Next(void** data, int* size) {
   if (position_ < size_) {
     last_returned_size_ = std::min(block_size_, size_ - position_);
@@ -153,9 +147,6 @@ StringOutputStream::StringOutputStream(string* target)
   : target_(target) {
 }
 
-StringOutputStream::~StringOutputStream() {
-}
-
 bool StringOutputStream::Next(void** data, int* size) {
   GOOGLE_CHECK(target_ != NULL);
   int old_size = target_->size();
@@ -205,32 +196,6 @@ void StringOutputStream::SetString(string* target) {
 
 // ===================================================================
 
-LazyStringOutputStream::LazyStringOutputStream(
-    ResultCallback<string*>* callback)
-    : StringOutputStream(NULL),
-      callback_(GOOGLE_CHECK_NOTNULL(callback)),
-      string_is_set_(false) {
-}
-
-LazyStringOutputStream::~LazyStringOutputStream() {
-}
-
-bool LazyStringOutputStream::Next(void** data, int* size) {
-  if (!string_is_set_) {
-    SetString(callback_->Run());
-    string_is_set_ = true;
-  }
-  return StringOutputStream::Next(data, size);
-}
-
-int64 LazyStringOutputStream::ByteCount() const {
-  return string_is_set_ ? StringOutputStream::ByteCount() : 0;
-}
-
-// ===================================================================
-
-CopyingInputStream::~CopyingInputStream() {}
-
 int CopyingInputStream::Skip(int count) {
   char junk[4096];
   int skipped = 0;
@@ -350,8 +315,6 @@ void CopyingInputStreamAdaptor::FreeBuffer() {
 
 // ===================================================================
 
-CopyingOutputStream::~CopyingOutputStream() {}
-
 CopyingOutputStreamAdaptor::CopyingOutputStreamAdaptor(
     CopyingOutputStream* copying_stream, int block_size)
   : copying_stream_(copying_stream),
diff --git a/src/google/protobuf/io/zero_copy_stream_impl_lite.h b/src/google/protobuf/io/zero_copy_stream_impl_lite.h
index e4d6a024..29f63bf0 100644
--- a/src/google/protobuf/io/zero_copy_stream_impl_lite.h
+++ b/src/google/protobuf/io/zero_copy_stream_impl_lite.h
@@ -45,9 +45,6 @@
 #define GOOGLE_PROTOBUF_IO_ZERO_COPY_STREAM_IMPL_LITE_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <iosfwd>
 #include <google/protobuf/io/zero_copy_stream.h>
@@ -73,7 +70,6 @@ class LIBPROTOBUF_EXPORT ArrayInputStream : public ZeroCopyInputStream {
   // useful for testing; in production you would probably never want to set
   // it.
   ArrayInputStream(const void* data, int size, int block_size = -1);
-  ~ArrayInputStream();
 
   // implements ZeroCopyInputStream ----------------------------------
   bool Next(const void** data, int* size);
@@ -107,7 +103,6 @@ class LIBPROTOBUF_EXPORT ArrayOutputStream : public ZeroCopyOutputStream {
   // useful for testing; in production you would probably never want to set
   // it.
   ArrayOutputStream(void* data, int size, int block_size = -1);
-  ~ArrayOutputStream();
 
   // implements ZeroCopyOutputStream ---------------------------------
   bool Next(void** data, int* size);
@@ -141,7 +136,6 @@ class LIBPROTOBUF_EXPORT StringOutputStream : public ZeroCopyOutputStream {
   //   the first call to Next() will return at least n bytes of buffer
   //   space.
   explicit StringOutputStream(string* target);
-  ~StringOutputStream();
 
   // implements ZeroCopyOutputStream ---------------------------------
   bool Next(void** data, int* size);
@@ -159,27 +153,6 @@ class LIBPROTOBUF_EXPORT StringOutputStream : public ZeroCopyOutputStream {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StringOutputStream);
 };
 
-// LazyStringOutputStream is a StringOutputStream with lazy acquisition of
-// the output string from a callback. The string is owned externally, and not
-// deleted in the stream destructor.
-class LIBPROTOBUF_EXPORT LazyStringOutputStream : public StringOutputStream {
- public:
-  // Callback should be permanent (non-self-deleting). Ownership is transferred
-  // to the LazyStringOutputStream.
-  explicit LazyStringOutputStream(ResultCallback<string*>* callback);
-  ~LazyStringOutputStream();
-
-  // implements ZeroCopyOutputStream, overriding StringOutputStream -----------
-  bool Next(void** data, int* size);
-  int64 ByteCount() const;
-
- private:
-  const google::protobuf::scoped_ptr<ResultCallback<string*> > callback_;
-  bool string_is_set_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(LazyStringOutputStream);
-};
-
 // Note:  There is no StringInputStream.  Instead, just create an
 // ArrayInputStream as follows:
 //   ArrayInputStream input(str.data(), str.size());
@@ -199,7 +172,7 @@ class LIBPROTOBUF_EXPORT LazyStringOutputStream : public StringOutputStream {
 // in large blocks.
 class LIBPROTOBUF_EXPORT CopyingInputStream {
  public:
-  virtual ~CopyingInputStream();
+  virtual ~CopyingInputStream() {}
 
   // Reads up to "size" bytes into the given buffer.  Returns the number of
   // bytes read.  Read() waits until at least one byte is available, or
@@ -263,7 +236,7 @@ class LIBPROTOBUF_EXPORT CopyingInputStreamAdaptor : public ZeroCopyInputStream
 
   // Data is read into this buffer.  It may be NULL if no buffer is currently
   // in use.  Otherwise, it points to an array of size buffer_size_.
-  google::protobuf::scoped_array<uint8> buffer_;
+  std::unique_ptr<uint8[]> buffer_;
   const int buffer_size_;
 
   // Number of valid bytes currently in the buffer (i.e. the size last
@@ -293,7 +266,7 @@ class LIBPROTOBUF_EXPORT CopyingInputStreamAdaptor : public ZeroCopyInputStream
 // in large blocks.
 class LIBPROTOBUF_EXPORT CopyingOutputStream {
  public:
-  virtual ~CopyingOutputStream();
+  virtual ~CopyingOutputStream() {}
 
   // Writes "size" bytes from the given buffer to the output.  Returns true
   // if successful, false on a write error.
@@ -352,7 +325,7 @@ class LIBPROTOBUF_EXPORT CopyingOutputStreamAdaptor : public ZeroCopyOutputStrea
 
   // Data is written from this buffer.  It may be NULL if no buffer is
   // currently in use.  Otherwise, it points to an array of size buffer_size_.
-  google::protobuf::scoped_array<uint8> buffer_;
+  std::unique_ptr<uint8[]> buffer_;
   const int buffer_size_;
 
   // Number of valid bytes currently in the buffer (i.e. the size last
@@ -399,7 +372,7 @@ inline std::pair<char*, bool> as_string_data(string* s) {
 #ifdef LANG_CXX11
   return std::make_pair(p, true);
 #else
-  return make_pair(p, p != NULL);
+  return std::make_pair(p, p != NULL);
 #endif
 }
 
diff --git a/src/google/protobuf/io/zero_copy_stream_unittest.cc b/src/google/protobuf/io/zero_copy_stream_unittest.cc
index 235cbca4..08de8cb1 100644
--- a/src/google/protobuf/io/zero_copy_stream_unittest.cc
+++ b/src/google/protobuf/io/zero_copy_stream_unittest.cc
@@ -47,9 +47,7 @@
 //   implementations.
 
 
-#ifdef _MSC_VER
-#include <io.h>
-#else
+#ifndef _MSC_VER
 #include <unistd.h>
 #endif
 #include <stdlib.h>
@@ -58,9 +56,6 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <sstream>
 
 #include <google/protobuf/testing/file.h>
@@ -76,6 +71,7 @@
 #include <google/protobuf/testing/googletest.h>
 #include <google/protobuf/testing/file.h>
 #include <gtest/gtest.h>
+#include <google/protobuf/stubs/io_win32.h>
 
 namespace google {
 namespace protobuf {
@@ -84,6 +80,12 @@ namespace {
 
 #ifdef _WIN32
 #define pipe(fds) _pipe(fds, 4096, O_BINARY)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::mkdir;
+using google::protobuf::internal::win32::open;
+using google::protobuf::internal::win32::close;
 #endif
 
 #ifndef O_BINARY
@@ -201,7 +203,7 @@ void IoTest::WriteString(ZeroCopyOutputStream* output, const string& str) {
 }
 
 void IoTest::ReadString(ZeroCopyInputStream* input, const string& str) {
-  google::protobuf::scoped_array<char> buffer(new char[str.size() + 1]);
+  std::unique_ptr<char[]> buffer(new char[str.size() + 1]);
   buffer[str.size()] = '\0';
   EXPECT_EQ(ReadFromInput(input, buffer.get(), str.size()), str.size());
   EXPECT_STREQ(str.c_str(), buffer.get());
diff --git a/src/google/protobuf/lite_arena_unittest.cc b/src/google/protobuf/lite_arena_unittest.cc
index f0bee880..3e88314d 100644
--- a/src/google/protobuf/lite_arena_unittest.cc
+++ b/src/google/protobuf/lite_arena_unittest.cc
@@ -30,20 +30,28 @@
 
 #include <google/protobuf/arena_test_util.h>
 #include <google/protobuf/map_lite_test_util.h>
-#include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 
 namespace google {
 namespace protobuf {
 namespace {
 
-TEST(LiteArenaTest, MapNoHeapAllocation) {
-  // Allocate a large initial block to avoid mallocs during hooked test.
-  std::vector<char> arena_block(128 * 1024);
-  google::protobuf::ArenaOptions options;
-  options.initial_block = &arena_block[0];
-  options.initial_block_size = arena_block.size();
-  google::protobuf::Arena arena(options);
+class LiteArenaTest : public testing::Test {
+ protected:
+  LiteArenaTest() {
+    ArenaOptions options;
+    options.start_block_size = 128 * 1024;
+    options.max_block_size = 128 * 1024;
+    arena_.reset(new Arena(options));
+    // Trigger the allocation of the first arena block, so that further use of
+    // the arena will not require any heap allocations.
+    google::protobuf::Arena::CreateArray<char>(arena_.get(), 1);
+  }
+
+  std::unique_ptr<Arena> arena_;
+};
+
+TEST_F(LiteArenaTest, MapNoHeapAllocation) {
   string data;
   data.reserve(128 * 1024);
 
@@ -53,22 +61,21 @@ TEST(LiteArenaTest, MapNoHeapAllocation) {
     // google::protobuf::internal::NoHeapChecker no_heap;
 
     protobuf_unittest::TestArenaMapLite* from =
-        google::protobuf::Arena::CreateMessage<protobuf_unittest::TestArenaMapLite>(&arena);
+        Arena::CreateMessage<protobuf_unittest::TestArenaMapLite>(arena_.get());
     google::protobuf::MapLiteTestUtil::SetArenaMapFields(from);
     from->SerializeToString(&data);
 
     protobuf_unittest::TestArenaMapLite* to =
-        google::protobuf::Arena::CreateMessage<protobuf_unittest::TestArenaMapLite>(&arena);
+        Arena::CreateMessage<protobuf_unittest::TestArenaMapLite>(arena_.get());
     to->ParseFromString(data);
     google::protobuf::MapLiteTestUtil::ExpectArenaMapFieldsSet(*to);
   }
 }
 
-TEST(LiteArenaTest, UnknownFieldMemLeak) {
-  google::protobuf::Arena arena;
+TEST_F(LiteArenaTest, UnknownFieldMemLeak) {
   protobuf_unittest::ForeignMessageArenaLite* message =
       google::protobuf::Arena::CreateMessage<protobuf_unittest::ForeignMessageArenaLite>(
-          &arena);
+          arena_.get());
   string data = "\012\000";
   int original_capacity = data.capacity();
   while (data.capacity() <= original_capacity) {
diff --git a/src/google/protobuf/lite_unittest.cc b/src/google/protobuf/lite_unittest.cc
index 3ca3fbaf..b42a7b14 100644
--- a/src/google/protobuf/lite_unittest.cc
+++ b/src/google/protobuf/lite_unittest.cc
@@ -36,24 +36,26 @@
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/arena_test_util.h>
-#include <google/protobuf/map_lite_unittest.pb.h>
 #include <google/protobuf/map_lite_test_util.h>
+#include <google/protobuf/map_lite_unittest.pb.h>
 #include <google/protobuf/test_util_lite.h>
 #include <google/protobuf/unittest_lite.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl_lite.h>
 #include <google/protobuf/wire_format_lite.h>
 #include <google/protobuf/wire_format_lite_inl.h>
+#include <gtest/gtest.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
-using namespace std;
+using std::string;
 
 namespace {
 // Helper methods to test parsing merge behavior.
 void ExpectMessageMerged(const google::protobuf::unittest::TestAllTypesLite& message) {
-  GOOGLE_CHECK(message.optional_int32() == 3);
-  GOOGLE_CHECK(message.optional_int64() == 2);
-  GOOGLE_CHECK(message.optional_string() == "hello");
+  EXPECT_EQ(message.optional_int32(), 3);
+  EXPECT_EQ(message.optional_int64(), 2);
+  EXPECT_EQ(message.optional_string(), "hello");
 }
 
 void AssignParsingMergeMessages(
@@ -89,14 +91,8 @@ void SetSomeTypesInEmptyMessageUnknownFields(
 
 }  // namespace
 
-#define EXPECT_TRUE GOOGLE_CHECK
-#define ASSERT_TRUE GOOGLE_CHECK
-#define EXPECT_FALSE(COND) GOOGLE_CHECK(!(COND))
-#define EXPECT_EQ GOOGLE_CHECK_EQ
-#define ASSERT_EQ GOOGLE_CHECK_EQ
-
-int main(int argc, char* argv[]) {
-  string data, data2, packed_data;
+TEST(Lite, AllLite1) {
+  string data;
 
   {
     protobuf_unittest::TestAllTypesLite message, message2, message3;
@@ -113,7 +109,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectClear(message);
   }
+}
 
+TEST(Lite, AllLite2) {
+  string data;
   {
     protobuf_unittest::TestAllExtensionsLite message, message2, message3;
     google::protobuf::TestUtilLite::ExpectExtensionsClear(message);
@@ -129,6 +128,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectExtensionsClear(message);
   }
+}
+
+TEST(Lite, AllLite3) {
+  string data, packed_data;
 
   {
     protobuf_unittest::TestPackedTypesLite message, message2, message3;
@@ -152,7 +155,7 @@ int main(int argc, char* argv[]) {
     google::protobuf::TestUtilLite::SetPackedExtensions(&message);
     message2.CopyFrom(message);
     string packed_extensions_data = message.SerializeAsString();
-    GOOGLE_CHECK(packed_extensions_data == packed_data);
+    EXPECT_EQ(packed_extensions_data, packed_data);
     message3.ParseFromString(packed_extensions_data);
     google::protobuf::TestUtilLite::ExpectPackedExtensionsSet(message);
     google::protobuf::TestUtilLite::ExpectPackedExtensionsSet(message2);
@@ -162,6 +165,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectPackedExtensionsClear(message);
   }
+}
+
+TEST(Lite, AllLite5) {
+  string data;
 
   {
     // Test that if an optional or required message/group field appears multiple
@@ -209,11 +216,16 @@ int main(int argc, char* argv[]) {
         google::protobuf::unittest::TestParsingMergeLite::optional_ext));
 
     // Repeated fields should not be merged.
-    GOOGLE_CHECK(parsing_merge.repeated_all_types_size() == 3);
-    GOOGLE_CHECK(parsing_merge.repeatedgroup_size() == 3);
-    GOOGLE_CHECK(parsing_merge.ExtensionSize(
-        google::protobuf::unittest::TestParsingMergeLite::repeated_ext) == 3);
+    EXPECT_EQ(parsing_merge.repeated_all_types_size(), 3);
+    EXPECT_EQ(parsing_merge.repeatedgroup_size(), 3);
+    EXPECT_EQ(parsing_merge.ExtensionSize(
+                  google::protobuf::unittest::TestParsingMergeLite::repeated_ext),
+              3);
   }
+}
+
+TEST(Lite, AllLite6) {
+  string data;
 
   // Test unknown fields support for lite messages.
   {
@@ -231,6 +243,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectClear(message);
   }
+}
+
+TEST(Lite, AllLite7) {
+  string data;
 
   {
     protobuf_unittest::TestAllExtensionsLite message, message2;
@@ -247,6 +263,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectExtensionsClear(message);
   }
+}
+
+TEST(Lite, AllLite8) {
+  string data;
 
   {
     protobuf_unittest::TestPackedTypesLite message, message2;
@@ -263,6 +283,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectPackedClear(message);
   }
+}
+
+TEST(Lite, AllLite9) {
+  string data;
 
   {
     protobuf_unittest::TestPackedExtensionsLite message, message2;
@@ -279,6 +303,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::TestUtilLite::ExpectPackedExtensionsClear(message);
   }
+}
+
+TEST(Lite, AllLite10) {
+  string data;
 
   {
     // Test Unknown fields swap
@@ -286,11 +314,15 @@ int main(int argc, char* argv[]) {
     SetAllTypesInEmptyMessageUnknownFields(&empty_message);
     SetSomeTypesInEmptyMessageUnknownFields(&empty_message2);
     data = empty_message.SerializeAsString();
-    data2 = empty_message2.SerializeAsString();
+    string data2 = empty_message2.SerializeAsString();
     empty_message.Swap(&empty_message2);
-    GOOGLE_CHECK_EQ(data, empty_message2.SerializeAsString());
-    GOOGLE_CHECK_EQ(data2, empty_message.SerializeAsString());
+    EXPECT_EQ(data, empty_message2.SerializeAsString());
+    EXPECT_EQ(data2, empty_message.SerializeAsString());
   }
+}
+
+TEST(Lite, AllLite11) {
+  string data;
 
   {
     // Test unknown fields swap with self
@@ -298,8 +330,12 @@ int main(int argc, char* argv[]) {
     SetAllTypesInEmptyMessageUnknownFields(&empty_message);
     data = empty_message.SerializeAsString();
     empty_message.Swap(&empty_message);
-    GOOGLE_CHECK_EQ(data, empty_message.SerializeAsString());
+    EXPECT_EQ(data, empty_message.SerializeAsString());
   }
+}
+
+TEST(Lite, AllLite12) {
+  string data;
 
   {
     // Test MergeFrom with unknown fields
@@ -324,8 +360,12 @@ int main(int argc, char* argv[]) {
     // We do not compare the serialized output of a normal message and a lite
     // message because the order of fields do not match. We convert lite message
     // back into normal message, then compare.
-    GOOGLE_CHECK_EQ(message.SerializeAsString(), message2.SerializeAsString());
+    EXPECT_EQ(message.SerializeAsString(), message2.SerializeAsString());
   }
+}
+
+TEST(Lite, AllLite13) {
+  string data;
 
   {
     // Test unknown enum value
@@ -345,18 +385,26 @@ int main(int argc, char* argv[]) {
     }
     message.ParseFromString(buffer);
     data = message.SerializeAsString();
-    GOOGLE_CHECK_EQ(data, buffer);
+    EXPECT_EQ(data, buffer);
   }
+}
+
+TEST(Lite, AllLite14) {
+  string data;
 
   {
     // Test Clear with unknown fields
     protobuf_unittest::TestEmptyMessageLite empty_message;
     SetAllTypesInEmptyMessageUnknownFields(&empty_message);
     empty_message.Clear();
-    GOOGLE_CHECK_EQ(0, empty_message.unknown_fields().size());
+    EXPECT_EQ(0, empty_message.unknown_fields().size());
   }
+}
 
-  // Tests for map lite =============================================
+// Tests for map lite =============================================
+
+TEST(Lite, AllLite15) {
+  string data;
 
   {
     // Accessors
@@ -368,6 +416,10 @@ int main(int argc, char* argv[]) {
     google::protobuf::MapLiteTestUtil::ModifyMapFields(&message);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsModified(message);
   }
+}
+
+TEST(Lite, AllLite16) {
+  string data;
 
   {
     // SetMapFieldsInitialized
@@ -376,6 +428,10 @@ int main(int argc, char* argv[]) {
     google::protobuf::MapLiteTestUtil::SetMapFieldsInitialized(&message);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSetInitialized(message);
   }
+}
+
+TEST(Lite, AllLite17) {
+  string data;
 
   {
     // Clear
@@ -385,6 +441,10 @@ int main(int argc, char* argv[]) {
     message.Clear();
     google::protobuf::MapLiteTestUtil::ExpectClear(message);
   }
+}
+
+TEST(Lite, AllLite18) {
+  string data;
 
   {
     // ClearMessageMap
@@ -394,6 +454,10 @@ int main(int argc, char* argv[]) {
     google::protobuf::TestUtilLite::ExpectClear(
         (*message.mutable_map_int32_message())[0]);
   }
+}
+
+TEST(Lite, AllLite19) {
+  string data;
 
   {
     // CopyFrom
@@ -407,6 +471,10 @@ int main(int argc, char* argv[]) {
     message2.CopyFrom(message2);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
+
+TEST(Lite, AllLite20) {
+  string data;
 
   {
     // CopyFromMessageMap
@@ -421,6 +489,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message1.map_int32_message().at(0).repeated_int32_size());
     EXPECT_EQ(101, message1.map_int32_message().at(0).repeated_int32(0));
   }
+}
+
+TEST(Lite, AllLite21) {
+  string data;
 
   {
     // SwapWithEmpty
@@ -434,6 +506,10 @@ int main(int argc, char* argv[]) {
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
     google::protobuf::MapLiteTestUtil::ExpectClear(message1);
   }
+}
+
+TEST(Lite, AllLite22) {
+  string data;
 
   {
     // SwapWithSelf
@@ -445,6 +521,10 @@ int main(int argc, char* argv[]) {
     message.Swap(&message);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message);
   }
+}
+
+TEST(Lite, AllLite23) {
+  string data;
 
   {
     // SwapWithOther
@@ -458,6 +538,10 @@ int main(int argc, char* argv[]) {
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsModified(message1);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
+
+TEST(Lite, AllLite24) {
+  string data;
 
   {
     // CopyConstructor
@@ -467,6 +551,10 @@ int main(int argc, char* argv[]) {
     protobuf_unittest::TestMapLite message2(message1);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
+
+TEST(Lite, AllLite25) {
+  string data;
 
   {
     // CopyAssignmentOperator
@@ -481,6 +569,10 @@ int main(int argc, char* argv[]) {
     message2.operator=(message2);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
+
+TEST(Lite, AllLite26) {
+  string data;
 
   {
     // NonEmptyMergeFrom
@@ -499,6 +591,10 @@ int main(int argc, char* argv[]) {
     message1.MergeFrom(message2);
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message1);
   }
+}
+
+TEST(Lite, AllLite27) {
+  string data;
 
   {
     // MergeFromMessageMap
@@ -513,6 +609,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message1.map_int32_message().at(0).repeated_int32_size());
     EXPECT_EQ(101, message1.map_int32_message().at(0).repeated_int32(0));
   }
+}
+
+TEST(Lite, AllLite28) {
+  string data;
 
   {
     // Test the generated SerializeWithCachedSizesToArray()
@@ -521,12 +621,16 @@ int main(int argc, char* argv[]) {
     google::protobuf::MapLiteTestUtil::SetMapFields(&message1);
     int size = message1.ByteSize();
     data.resize(size);
-    ::google::protobuf::uint8* start = reinterpret_cast< ::google::protobuf::uint8*>(::google::protobuf::string_as_array(&data));
+    ::google::protobuf::uint8* start = reinterpret_cast<::google::protobuf::uint8*>(::google::protobuf::string_as_array(&data));
     ::google::protobuf::uint8* end = message1.SerializeWithCachedSizesToArray(start);
     EXPECT_EQ(size, end - start);
     EXPECT_TRUE(message2.ParseFromString(data));
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
+
+TEST(Lite, AllLite29) {
+  string data;
 
   {
     // Test the generated SerializeWithCachedSizes()
@@ -547,8 +651,12 @@ int main(int argc, char* argv[]) {
     EXPECT_TRUE(message2.ParseFromString(data));
     google::protobuf::MapLiteTestUtil::ExpectMapFieldsSet(message2);
   }
+}
 
 
+TEST(Lite, AllLite32) {
+  string data;
+
   {
     // Proto2UnknownEnum
     protobuf_unittest::TestEnumMapPlusExtraLite from;
@@ -578,6 +686,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(protobuf_unittest::E_PROTO2_MAP_ENUM_EXTRA_LITE,
               from.unknown_map_field().at(0));
   }
+}
+
+TEST(Lite, AllLite33) {
+  string data;
 
   {
     // StandardWireFormat
@@ -588,6 +700,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(1, message.map_int32_int32().at(1));
   }
+}
+
+TEST(Lite, AllLite34) {
+  string data;
 
   {
     // UnorderedWireFormat
@@ -600,6 +716,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(1, message.map_int32_int32().at(2));
   }
+}
+
+TEST(Lite, AllLite35) {
+  string data;
 
   {
     // DuplicatedKeyWireFormat
@@ -612,6 +732,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(1, message.map_int32_int32().at(2));
   }
+}
+
+TEST(Lite, AllLite36) {
+  string data;
 
   {
     // DuplicatedValueWireFormat
@@ -624,6 +748,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(2, message.map_int32_int32().at(1));
   }
+}
+
+TEST(Lite, AllLite37) {
+  string data;
 
   {
     // MissedKeyWireFormat
@@ -636,6 +764,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(1, message.map_int32_int32().at(0));
   }
+}
+
+TEST(Lite, AllLite38) {
+  string data;
 
   {
     // MissedValueWireFormat
@@ -648,6 +780,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(0, message.map_int32_int32().at(1));
   }
+}
+
+TEST(Lite, AllLite39) {
+  string data;
 
   {
     // UnknownFieldWireFormat
@@ -660,6 +796,10 @@ int main(int argc, char* argv[]) {
     EXPECT_EQ(1, message.map_int32_int32().size());
     EXPECT_EQ(3, message.map_int32_int32().at(2));
   }
+}
+
+TEST(Lite, AllLite40) {
+  string data;
 
   {
     // CorruptedWireFormat
@@ -670,6 +810,10 @@ int main(int argc, char* argv[]) {
 
     EXPECT_FALSE(message.ParseFromString(data));
   }
+}
+
+TEST(Lite, AllLite41) {
+  string data;
 
   {
     // IsInitialized
@@ -685,6 +829,10 @@ int main(int argc, char* argv[]) {
     (*map_message.mutable_map_field())[0].set_c(0);
     EXPECT_TRUE(map_message.IsInitialized());
   }
+}
+
+TEST(Lite, AllLite42) {
+  string data;
 
   {
       // Check that adding more values to enum does not corrupt message
@@ -712,7 +860,177 @@ int main(int argc, char* argv[]) {
       EXPECT_EQ(v2_message.int_field(), same_v2_message.int_field());
       EXPECT_EQ(v2_message.enum_field(), same_v2_message.enum_field());
   }
+}
+
+// Test that when parsing a oneof, we can successfully clear whatever already
+// happened to be stored in the oneof.
+TEST(Lite, AllLite43) {
+  protobuf_unittest::TestOneofParsingLite message1;
+
+  message1.set_oneof_int32(17);
+  string serialized;
+  EXPECT_TRUE(message1.SerializeToString(&serialized));
+
+  // Submessage
+  {
+    protobuf_unittest::TestOneofParsingLite message2;
+    message2.mutable_oneof_submessage();
+    google::protobuf::io::CodedInputStream input_stream(
+        reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()), serialized.size());
+    EXPECT_TRUE(message2.MergeFromCodedStream(&input_stream));
+    EXPECT_EQ(17, message2.oneof_int32());
+  }
+
+  // String
+  {
+    protobuf_unittest::TestOneofParsingLite message2;
+    message2.set_oneof_string("string");
+    google::protobuf::io::CodedInputStream input_stream(
+        reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()), serialized.size());
+    EXPECT_TRUE(message2.MergeFromCodedStream(&input_stream));
+    EXPECT_EQ(17, message2.oneof_int32());
+  }
+
+  // Bytes
+  {
+    protobuf_unittest::TestOneofParsingLite message2;
+    message2.set_oneof_bytes("bytes");
+    google::protobuf::io::CodedInputStream input_stream(
+        reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()), serialized.size());
+    EXPECT_TRUE(message2.MergeFromCodedStream(&input_stream));
+    EXPECT_EQ(17, message2.oneof_int32());
+  }
+}
+
+// Verify that we can successfully parse fields of various types within oneof
+// fields. We also verify that we can parse the same data twice into the same
+// message.
+TEST(Lite, AllLite44) {
+  // Int32
+  {
+    protobuf_unittest::TestOneofParsingLite original;
+    original.set_oneof_int32(17);
+    string serialized;
+    EXPECT_TRUE(original.SerializeToString(&serialized));
+    protobuf_unittest::TestOneofParsingLite parsed;
+    for (int i = 0; i < 2; ++i) {
+      google::protobuf::io::CodedInputStream input_stream(
+          reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()),
+          serialized.size());
+      EXPECT_TRUE(parsed.MergeFromCodedStream(&input_stream));
+      EXPECT_EQ(17, parsed.oneof_int32());
+    }
+  }
+
+  // Submessage
+  {
+    protobuf_unittest::TestOneofParsingLite original;
+    original.mutable_oneof_submessage()->set_optional_int32(5);
+    string serialized;
+    EXPECT_TRUE(original.SerializeToString(&serialized));
+    protobuf_unittest::TestOneofParsingLite parsed;
+    for (int i = 0; i < 2; ++i) {
+      google::protobuf::io::CodedInputStream input_stream(
+          reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()),
+          serialized.size());
+      EXPECT_TRUE(parsed.MergeFromCodedStream(&input_stream));
+      EXPECT_EQ(5, parsed.oneof_submessage().optional_int32());
+    }
+  }
+
+  // String
+  {
+    protobuf_unittest::TestOneofParsingLite original;
+    original.set_oneof_string("string");
+    string serialized;
+    EXPECT_TRUE(original.SerializeToString(&serialized));
+    protobuf_unittest::TestOneofParsingLite parsed;
+    for (int i = 0; i < 2; ++i) {
+      google::protobuf::io::CodedInputStream input_stream(
+          reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()),
+          serialized.size());
+      EXPECT_TRUE(parsed.MergeFromCodedStream(&input_stream));
+      EXPECT_EQ("string", parsed.oneof_string());
+    }
+  }
+
+  // Bytes
+  {
+    protobuf_unittest::TestOneofParsingLite original;
+    original.set_oneof_bytes("bytes");
+    string serialized;
+    EXPECT_TRUE(original.SerializeToString(&serialized));
+    protobuf_unittest::TestOneofParsingLite parsed;
+    for (int i = 0; i < 2; ++i) {
+      google::protobuf::io::CodedInputStream input_stream(
+          reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()),
+          serialized.size());
+      EXPECT_TRUE(parsed.MergeFromCodedStream(&input_stream));
+      EXPECT_EQ("bytes", parsed.oneof_bytes());
+    }
+  }
+
+  // Enum
+  {
+    protobuf_unittest::TestOneofParsingLite original;
+    original.set_oneof_enum(protobuf_unittest::V2_SECOND);
+    string serialized;
+    EXPECT_TRUE(original.SerializeToString(&serialized));
+    protobuf_unittest::TestOneofParsingLite parsed;
+    for (int i = 0; i < 2; ++i) {
+      google::protobuf::io::CodedInputStream input_stream(
+          reinterpret_cast<const ::google::protobuf::uint8*>(serialized.data()),
+          serialized.size());
+      EXPECT_TRUE(parsed.MergeFromCodedStream(&input_stream));
+      EXPECT_EQ(protobuf_unittest::V2_SECOND, parsed.oneof_enum());
+    }
+  }
 
   std::cout << "PASS" << std::endl;
-  return 0;
+}
+
+TEST(Lite, AllLite45) {
+  // Test unknown fields are not discarded upon parsing.
+  string data = "\20\1";  // varint 1 with field number 2
+
+  protobuf_unittest::ForeignMessageLite a;
+  EXPECT_TRUE(a.ParseFromString(data));
+  google::protobuf::io::CodedInputStream input_stream(
+      reinterpret_cast<const ::google::protobuf::uint8*>(data.data()), data.size());
+  EXPECT_TRUE(a.MergePartialFromCodedStream(&input_stream));
+
+  string serialized = a.SerializeAsString();
+  EXPECT_EQ(serialized.substr(0, 2), data);
+  EXPECT_EQ(serialized.substr(2), data);
+}
+
+// The following two tests check for wire compatibility between packed and
+// unpacked repeated fields. There used to be a bug in the generated parsing
+// code that caused us to calculate the highest possible tag number without
+// taking into account that a repeated field might not be in the packed (or
+// unpacked) state we expect. These tests specifically check for that issue by
+// making sure we can parse repeated fields when the tag is higher than we would
+// expect.
+TEST(Lite, AllLite46) {
+  protobuf_unittest::PackedInt32 packed;
+  packed.add_repeated_int32(42);
+  string serialized;
+  ASSERT_TRUE(packed.SerializeToString(&serialized));
+
+  protobuf_unittest::NonPackedInt32 non_packed;
+  ASSERT_TRUE(non_packed.ParseFromString(serialized));
+  ASSERT_EQ(1, non_packed.repeated_int32_size());
+  EXPECT_EQ(42, non_packed.repeated_int32(0));
+}
+
+TEST(Lite, AllLite47) {
+  protobuf_unittest::NonPackedFixed32 non_packed;
+  non_packed.add_repeated_fixed32(42);
+  string serialized;
+  ASSERT_TRUE(non_packed.SerializeToString(&serialized));
+
+  protobuf_unittest::PackedFixed32 packed;
+  ASSERT_TRUE(packed.ParseFromString(serialized));
+  ASSERT_EQ(1, packed.repeated_fixed32_size());
+  EXPECT_EQ(42, packed.repeated_fixed32(0));
 }
diff --git a/src/google/protobuf/map.h b/src/google/protobuf/map.h
index 61a23897..6463ac2e 100644
--- a/src/google/protobuf/map.h
+++ b/src/google/protobuf/map.h
@@ -37,7 +37,7 @@
 #ifndef GOOGLE_PROTOBUF_MAP_H__
 #define GOOGLE_PROTOBUF_MAP_H__
 
-#include <google/protobuf/stubs/hash.h>
+#include <initializer_list>
 #include <iterator>
 #include <limits>  // To support Visual Studio 2008
 #include <set>
@@ -47,11 +47,7 @@
 #include <google/protobuf/arena.h>
 #include <google/protobuf/generated_enum_util.h>
 #include <google/protobuf/map_type_handler.h>
-#include <google/protobuf/message.h>
-#include <google/protobuf/descriptor.h>
-#if __cpp_exceptions && LANG_CXX11
-#include <random>
-#endif
+#include <google/protobuf/stubs/hash.h>
 
 namespace google {
 namespace protobuf {
@@ -64,16 +60,14 @@ class MapIterator;
 template <typename Enum> struct is_proto_enum;
 
 namespace internal {
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
+          WireFormatLite::FieldType value_wire_type, int default_enum_value>
 class MapFieldLite;
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
+          WireFormatLite::FieldType value_wire_type, int default_enum_value>
 class MapField;
 
 template <typename Key, typename T>
@@ -84,389 +78,6 @@ class DynamicMapField;
 class GeneratedMessageReflection;
 }  // namespace internal
 
-#define TYPE_CHECK(EXPECTEDTYPE, METHOD)                        \
-  if (type() != EXPECTEDTYPE) {                                 \
-    GOOGLE_LOG(FATAL)                                                  \
-        << "Protocol Buffer map usage error:\n"                 \
-        << METHOD << " type does not match\n"                   \
-        << "  Expected : "                                      \
-        << FieldDescriptor::CppTypeName(EXPECTEDTYPE) << "\n"   \
-        << "  Actual   : "                                      \
-        << FieldDescriptor::CppTypeName(type());                \
-  }
-
-// MapKey is an union type for representing any possible
-// map key.
-class LIBPROTOBUF_EXPORT MapKey {
- public:
-  MapKey() : type_(0) {
-  }
-  MapKey(const MapKey& other) : type_(0) {
-    CopyFrom(other);
-  }
-
-  ~MapKey() {
-    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
-      delete val_.string_value_;
-    }
-  }
-
-  FieldDescriptor::CppType type() const {
-    if (type_ == 0) {
-      GOOGLE_LOG(FATAL)
-          << "Protocol Buffer map usage error:\n"
-          << "MapKey::type MapKey is not initialized. "
-          << "Call set methods to initialize MapKey.";
-    }
-    return (FieldDescriptor::CppType)type_;
-  }
-
-  void SetInt64Value(int64 value) {
-    SetType(FieldDescriptor::CPPTYPE_INT64);
-    val_.int64_value_ = value;
-  }
-  void SetUInt64Value(uint64 value) {
-    SetType(FieldDescriptor::CPPTYPE_UINT64);
-    val_.uint64_value_ = value;
-  }
-  void SetInt32Value(int32 value) {
-    SetType(FieldDescriptor::CPPTYPE_INT32);
-    val_.int32_value_ = value;
-  }
-  void SetUInt32Value(uint32 value) {
-    SetType(FieldDescriptor::CPPTYPE_UINT32);
-    val_.uint32_value_ = value;
-  }
-  void SetBoolValue(bool value) {
-    SetType(FieldDescriptor::CPPTYPE_BOOL);
-    val_.bool_value_ = value;
-  }
-  void SetStringValue(const string& val) {
-    SetType(FieldDescriptor::CPPTYPE_STRING);
-    *val_.string_value_ = val;
-  }
-
-  int64 GetInt64Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
-               "MapKey::GetInt64Value");
-    return val_.int64_value_;
-  }
-  uint64 GetUInt64Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
-               "MapKey::GetUInt64Value");
-    return val_.uint64_value_;
-  }
-  int32 GetInt32Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
-               "MapKey::GetInt32Value");
-    return val_.int32_value_;
-  }
-  uint32 GetUInt32Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
-               "MapKey::GetUInt32Value");
-    return val_.uint32_value_;
-  }
-  bool GetBoolValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
-               "MapKey::GetBoolValue");
-    return val_.bool_value_;
-  }
-  const string& GetStringValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
-               "MapKey::GetStringValue");
-    return *val_.string_value_;
-  }
-
-  bool operator<(const MapKey& other) const {
-    if (type_ != other.type_) {
-      // We could define a total order that handles this case, but
-      // there currently no need.  So, for now, fail.
-      GOOGLE_LOG(FATAL) << "Unsupported: type mismatch";
-    }
-    switch (type()) {
-      case FieldDescriptor::CPPTYPE_DOUBLE:
-      case FieldDescriptor::CPPTYPE_FLOAT:
-      case FieldDescriptor::CPPTYPE_ENUM:
-      case FieldDescriptor::CPPTYPE_MESSAGE:
-        GOOGLE_LOG(FATAL) << "Unsupported";
-        return false;
-      case FieldDescriptor::CPPTYPE_STRING:
-        return *val_.string_value_ < *other.val_.string_value_;
-      case FieldDescriptor::CPPTYPE_INT64:
-        return val_.int64_value_ < other.val_.int64_value_;
-      case FieldDescriptor::CPPTYPE_INT32:
-        return val_.int32_value_ < other.val_.int32_value_;
-      case FieldDescriptor::CPPTYPE_UINT64:
-        return val_.uint64_value_ < other.val_.uint64_value_;
-      case FieldDescriptor::CPPTYPE_UINT32:
-        return val_.uint32_value_ < other.val_.uint32_value_;
-      case FieldDescriptor::CPPTYPE_BOOL:
-        return val_.bool_value_ < other.val_.bool_value_;
-    }
-    return false;
-  }
-
-  bool operator==(const MapKey& other) const {
-    if (type_ != other.type_) {
-      // To be consistent with operator<, we don't allow this either.
-      GOOGLE_LOG(FATAL) << "Unsupported: type mismatch";
-    }
-    switch (type()) {
-      case FieldDescriptor::CPPTYPE_DOUBLE:
-      case FieldDescriptor::CPPTYPE_FLOAT:
-      case FieldDescriptor::CPPTYPE_ENUM:
-      case FieldDescriptor::CPPTYPE_MESSAGE:
-        GOOGLE_LOG(FATAL) << "Unsupported";
-        break;
-      case FieldDescriptor::CPPTYPE_STRING:
-        return *val_.string_value_ == *other.val_.string_value_;
-      case FieldDescriptor::CPPTYPE_INT64:
-        return val_.int64_value_ == other.val_.int64_value_;
-      case FieldDescriptor::CPPTYPE_INT32:
-        return val_.int32_value_ == other.val_.int32_value_;
-      case FieldDescriptor::CPPTYPE_UINT64:
-        return val_.uint64_value_ == other.val_.uint64_value_;
-      case FieldDescriptor::CPPTYPE_UINT32:
-        return val_.uint32_value_ == other.val_.uint32_value_;
-      case FieldDescriptor::CPPTYPE_BOOL:
-        return val_.bool_value_ == other.val_.bool_value_;
-    }
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return false;
-  }
-
-  void CopyFrom(const MapKey& other) {
-    SetType(other.type());
-    switch (type_) {
-      case FieldDescriptor::CPPTYPE_DOUBLE:
-      case FieldDescriptor::CPPTYPE_FLOAT:
-      case FieldDescriptor::CPPTYPE_ENUM:
-      case FieldDescriptor::CPPTYPE_MESSAGE:
-        GOOGLE_LOG(FATAL) << "Unsupported";
-        break;
-      case FieldDescriptor::CPPTYPE_STRING:
-        *val_.string_value_ = *other.val_.string_value_;
-        break;
-      case FieldDescriptor::CPPTYPE_INT64:
-        val_.int64_value_ = other.val_.int64_value_;
-        break;
-      case FieldDescriptor::CPPTYPE_INT32:
-        val_.int32_value_ = other.val_.int32_value_;
-        break;
-      case FieldDescriptor::CPPTYPE_UINT64:
-        val_.uint64_value_ = other.val_.uint64_value_;
-        break;
-      case FieldDescriptor::CPPTYPE_UINT32:
-        val_.uint32_value_ = other.val_.uint32_value_;
-        break;
-      case FieldDescriptor::CPPTYPE_BOOL:
-        val_.bool_value_ = other.val_.bool_value_;
-        break;
-    }
-  }
-
- private:
-  template <typename K, typename V>
-  friend class internal::TypeDefinedMapFieldBase;
-  friend class MapIterator;
-  friend class internal::DynamicMapField;
-
-  union KeyValue {
-    KeyValue() {}
-    string* string_value_;
-    int64 int64_value_;
-    int32 int32_value_;
-    uint64 uint64_value_;
-    uint32 uint32_value_;
-    bool bool_value_;
-  } val_;
-
-  void SetType(FieldDescriptor::CppType type) {
-    if (type_ == type) return;
-    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
-      delete val_.string_value_;
-    }
-    type_ = type;
-    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
-      val_.string_value_ = new string;
-    }
-  }
-
-  // type_ is 0 or a valid FieldDescriptor::CppType.
-  int type_;
-};
-
-// MapValueRef points to a map value.
-class LIBPROTOBUF_EXPORT MapValueRef {
- public:
-  MapValueRef() : data_(NULL), type_(0) {}
-
-  void SetInt64Value(int64 value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
-               "MapValueRef::SetInt64Value");
-    *reinterpret_cast<int64*>(data_) = value;
-  }
-  void SetUInt64Value(uint64 value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
-               "MapValueRef::SetUInt64Value");
-    *reinterpret_cast<uint64*>(data_) = value;
-  }
-  void SetInt32Value(int32 value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
-               "MapValueRef::SetInt32Value");
-    *reinterpret_cast<int32*>(data_) = value;
-  }
-  void SetUInt32Value(uint32 value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
-               "MapValueRef::SetUInt32Value");
-    *reinterpret_cast<uint32*>(data_) = value;
-  }
-  void SetBoolValue(bool value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
-               "MapValueRef::SetBoolValue");
-    *reinterpret_cast<bool*>(data_) = value;
-  }
-  // TODO(jieluo) - Checks that enum is member.
-  void SetEnumValue(int value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_ENUM,
-               "MapValueRef::SetEnumValue");
-    *reinterpret_cast<int*>(data_) = value;
-  }
-  void SetStringValue(const string& value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
-               "MapValueRef::SetStringValue");
-    *reinterpret_cast<string*>(data_) = value;
-  }
-  void SetFloatValue(float value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_FLOAT,
-               "MapValueRef::SetFloatValue");
-    *reinterpret_cast<float*>(data_) = value;
-  }
-  void SetDoubleValue(double value) {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_DOUBLE,
-               "MapValueRef::SetDoubleValue");
-    *reinterpret_cast<double*>(data_) = value;
-  }
-
-  int64 GetInt64Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
-               "MapValueRef::GetInt64Value");
-    return *reinterpret_cast<int64*>(data_);
-  }
-  uint64 GetUInt64Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
-               "MapValueRef::GetUInt64Value");
-    return *reinterpret_cast<uint64*>(data_);
-  }
-  int32 GetInt32Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
-               "MapValueRef::GetInt32Value");
-    return *reinterpret_cast<int32*>(data_);
-  }
-  uint32 GetUInt32Value() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
-               "MapValueRef::GetUInt32Value");
-    return *reinterpret_cast<uint32*>(data_);
-  }
-  bool GetBoolValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
-               "MapValueRef::GetBoolValue");
-    return *reinterpret_cast<bool*>(data_);
-  }
-  int GetEnumValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_ENUM,
-               "MapValueRef::GetEnumValue");
-    return *reinterpret_cast<int*>(data_);
-  }
-  const string& GetStringValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
-               "MapValueRef::GetStringValue");
-    return *reinterpret_cast<string*>(data_);
-  }
-  float GetFloatValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_FLOAT,
-               "MapValueRef::GetFloatValue");
-    return *reinterpret_cast<float*>(data_);
-  }
-  double GetDoubleValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_DOUBLE,
-               "MapValueRef::GetDoubleValue");
-    return *reinterpret_cast<double*>(data_);
-  }
-
-  const Message& GetMessageValue() const {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_MESSAGE,
-               "MapValueRef::GetMessageValue");
-    return *reinterpret_cast<Message*>(data_);
-  }
-
-  Message* MutableMessageValue() {
-    TYPE_CHECK(FieldDescriptor::CPPTYPE_MESSAGE,
-               "MapValueRef::MutableMessageValue");
-    return reinterpret_cast<Message*>(data_);
-  }
-
- private:
-  template <typename K, typename V,
-            internal::WireFormatLite::FieldType key_wire_type,
-            internal::WireFormatLite::FieldType value_wire_type,
-            int default_enum_value>
-  friend class internal::MapField;
-  template <typename K, typename V>
-  friend class internal::TypeDefinedMapFieldBase;
-  friend class MapIterator;
-  friend class internal::GeneratedMessageReflection;
-  friend class internal::DynamicMapField;
-
-  void SetType(FieldDescriptor::CppType type) {
-    type_ = type;
-  }
-
-  FieldDescriptor::CppType type() const {
-    if (type_ == 0 || data_ == NULL) {
-      GOOGLE_LOG(FATAL)
-          << "Protocol Buffer map usage error:\n"
-          << "MapValueRef::type MapValueRef is not initialized.";
-    }
-    return (FieldDescriptor::CppType)type_;
-  }
-  void SetValue(const void* val) {
-    data_ = const_cast<void*>(val);
-  }
-  void CopyFrom(const MapValueRef& other) {
-    type_ = other.type_;
-    data_ = other.data_;
-  }
-  // Only used in DynamicMapField
-  void DeleteData() {
-    switch (type_) {
-#define HANDLE_TYPE(CPPTYPE, TYPE)                              \
-      case google::protobuf::FieldDescriptor::CPPTYPE_##CPPTYPE: {        \
-        delete reinterpret_cast<TYPE*>(data_);                  \
-        break;                                                  \
-      }
-      HANDLE_TYPE(INT32, int32);
-      HANDLE_TYPE(INT64, int64);
-      HANDLE_TYPE(UINT32, uint32);
-      HANDLE_TYPE(UINT64, uint64);
-      HANDLE_TYPE(DOUBLE, double);
-      HANDLE_TYPE(FLOAT, float);
-      HANDLE_TYPE(BOOL, bool);
-      HANDLE_TYPE(STRING, string);
-      HANDLE_TYPE(ENUM, int32);
-      HANDLE_TYPE(MESSAGE, Message);
-#undef HANDLE_TYPE
-    }
-  }
-  // data_ point to a map value. MapValueRef does not
-  // own this value.
-  void* data_;
-  // type_ is 0 or a valid FieldDescriptor::CppType.
-  int type_;
-};
-
-#undef TYPE_CHECK
-
 // This is the class for google::protobuf::Map's internal value_type. Instead of using
 // std::pair as value_type, we use this class which provides us more control of
 // its process of construction and destruction.
@@ -523,30 +134,36 @@ class Map {
   typedef size_t size_type;
   typedef hash<Key> hasher;
 
-  explicit Map(bool old_style = false)
-      : arena_(NULL),
-        default_enum_value_(0),
-        old_style_(old_style) {
-    Init();
-  }
-  explicit Map(Arena* arena, bool old_style = false)
-      : arena_(arena),
-        default_enum_value_(0),
-        old_style_(old_style) {
-    Init();
-  }
+  Map() : arena_(NULL), default_enum_value_(0) { Init(); }
+  explicit Map(Arena* arena) : arena_(arena), default_enum_value_(0) { Init(); }
+
   Map(const Map& other)
-      : arena_(NULL),
-        default_enum_value_(other.default_enum_value_),
-        old_style_(other.old_style_) {
+      : arena_(NULL), default_enum_value_(other.default_enum_value_) {
     Init();
     insert(other.begin(), other.end());
   }
+
+  Map(Map&& other) noexcept : Map() {
+    if (other.arena_) {
+      *this = other;
+    } else {
+      swap(other);
+    }
+  }
+  Map& operator=(Map&& other) noexcept {
+    if (this != &other) {
+      if (arena_ != other.arena_) {
+        *this = other;
+      } else {
+        swap(other);
+      }
+    }
+    return *this;
+  }
+
   template <class InputIt>
-  Map(const InputIt& first, const InputIt& last, bool old_style = false)
-      : arena_(NULL),
-        default_enum_value_(0),
-        old_style_(old_style) {
+  Map(const InputIt& first, const InputIt& last)
+      : arena_(NULL), default_enum_value_(0) {
     Init();
     insert(first, last);
   }
@@ -554,22 +171,13 @@ class Map {
   ~Map() {
     clear();
     if (arena_ == NULL) {
-      if (old_style_)
-        delete deprecated_elements_;
-      else
-        delete elements_;
+      delete elements_;
     }
   }
 
  private:
   void Init() {
-    if (old_style_)
-      deprecated_elements_ = Arena::Create<DeprecatedInnerMap>(
-          arena_, 0, hasher(), std::equal_to<Key>(),
-          MapAllocator<std::pair<const Key, MapPair<Key, T>*> >(arena_));
-    else
-      elements_ =
-          Arena::Create<InnerMap>(arena_, 0, hasher(), Allocator(arena_));
+    elements_ = Arena::Create<InnerMap>(arena_, 0u, hasher(), Allocator(arena_));
   }
 
   // re-implement std::allocator to use arena allocator for memory allocation.
@@ -592,7 +200,7 @@ class Map {
     MapAllocator(const MapAllocator<X>& allocator)
         : arena_(allocator.arena()) {}
 
-    pointer allocate(size_type n, const void* hint = 0) {
+    pointer allocate(size_type n, const void* /* hint */ = 0) {
       // If arena is not given, malloc needs to be called which doesn't
       // construct element object.
       if (arena_ == NULL) {
@@ -608,6 +216,7 @@ class Map {
 #if defined(__GXX_DELETE_WITH_SIZE__) || defined(__cpp_sized_deallocation)
         ::operator delete(p, n * sizeof(value_type));
 #else
+        (void)n;
         ::operator delete(p);
 #endif
       }
@@ -678,7 +287,7 @@ class Map {
 
     const Key& key() const { return k_; }
     Key& key() { return k_; }
-    value_type* const value() const { return v_; }
+    value_type* value() const { return v_; }
     value_type*& value() { return v_; }
 
    private:
@@ -764,14 +373,13 @@ class Map {
     };
     typedef typename Allocator::template rebind<Key*>::other KeyPtrAllocator;
     typedef std::set<Key*, KeyCompare, KeyPtrAllocator> Tree;
+    typedef typename Tree::iterator TreeIterator;
 
     // iterator and const_iterator are instantiations of iterator_base.
     template <typename KeyValueType>
-    class iterator_base {
-     public:
+    struct iterator_base {
       typedef KeyValueType& reference;
       typedef KeyValueType* pointer;
-      typedef typename Tree::iterator TreeIterator;
 
       // Invariants:
       // node_ is always correct. This is handy because the most common
@@ -780,7 +388,7 @@ class Map {
       // are updated to be correct also, but those fields can become stale
       // if the underlying map is modified.  When those fields are needed they
       // are rechecked, and updated if necessary.
-      iterator_base() : node_(NULL) {}
+      iterator_base() : node_(NULL), m_(NULL), bucket_index_(0) {}
 
       explicit iterator_base(const InnerMap* m) : m_(m) {
         SearchFrom(m->index_of_first_non_null_);
@@ -791,22 +399,15 @@ class Map {
       // can convert to const_iterator" is OK but the reverse direction is not.
       template <typename U>
       explicit iterator_base(const iterator_base<U>& it)
-          : node_(it.node_),
-            m_(it.m_),
-            bucket_index_(it.bucket_index_),
-            tree_it_(it.tree_it_) {}
+          : node_(it.node_), m_(it.m_), bucket_index_(it.bucket_index_) {}
 
       iterator_base(Node* n, const InnerMap* m, size_type index)
-          : node_(n),
-            m_(m),
-            bucket_index_(index) {}
+          : node_(n), m_(m), bucket_index_(index) {}
 
       iterator_base(TreeIterator tree_it, const InnerMap* m, size_type index)
-          : node_(NodePtrFromKeyPtr(*tree_it)),
-            m_(m),
-            bucket_index_(index),
-            tree_it_(tree_it) {
-        // Invariant: iterators that use tree_it_ have an even bucket_index_.
+          : node_(NodePtrFromKeyPtr(*tree_it)), m_(m), bucket_index_(index) {
+        // Invariant: iterators that use buckets with trees have an even
+        // bucket_index_.
         GOOGLE_DCHECK_EQ(bucket_index_ % 2, 0);
       }
 
@@ -824,8 +425,7 @@ class Map {
           } else if (m_->TableEntryIsTree(bucket_index_)) {
             Tree* tree = static_cast<Tree*>(m_->table_[bucket_index_]);
             GOOGLE_DCHECK(!tree->empty());
-            tree_it_ = tree->begin();
-            node_ = NodePtrFromKeyPtr(*tree_it_);
+            node_ = NodePtrFromKeyPtr(*tree->begin());
             break;
           }
         }
@@ -843,16 +443,17 @@ class Map {
 
       iterator_base& operator++() {
         if (node_->next == NULL) {
-          const bool is_list = revalidate_if_necessary();
+          TreeIterator tree_it;
+          const bool is_list = revalidate_if_necessary(&tree_it);
           if (is_list) {
             SearchFrom(bucket_index_ + 1);
           } else {
             GOOGLE_DCHECK_EQ(bucket_index_ & 1, 0);
             Tree* tree = static_cast<Tree*>(m_->table_[bucket_index_]);
-            if (++tree_it_ == tree->end()) {
+            if (++tree_it == tree->end()) {
               SearchFrom(bucket_index_ + 2);
             } else {
-              node_ = NodePtrFromKeyPtr(*tree_it_);
+              node_ = NodePtrFromKeyPtr(*tree_it);
             }
           }
         } else {
@@ -869,8 +470,9 @@ class Map {
 
       // Assumes node_ and m_ are correct and non-NULL, but other fields may be
       // stale.  Fix them as needed.  Then return true iff node_ points to a
-      // Node in a list.
-      bool revalidate_if_necessary() {
+      // Node in a list.  If false is returned then *it is modified to be
+      // a valid iterator for node_.
+      bool revalidate_if_necessary(TreeIterator* it) {
         GOOGLE_DCHECK(node_ != NULL && m_ != NULL);
         // Force bucket_index_ to be in range.
         bucket_index_ &= (m_->num_buckets_ - 1);
@@ -891,16 +493,14 @@ class Map {
         // not.  Revalidate just to be sure.  This case is rare enough that we
         // don't worry about potential optimizations, such as having a custom
         // find-like method that compares Node* instead of const Key&.
-        iterator_base i(m_->find(*KeyPtrFromNodePtr(node_)));
+        iterator_base i(m_->find(*KeyPtrFromNodePtr(node_), it));
         bucket_index_ = i.bucket_index_;
-        tree_it_ = i.tree_it_;
         return m_->TableEntryIsList(bucket_index_);
       }
 
       Node* node_;
       const InnerMap* m_;
       size_type bucket_index_;
-      TreeIterator tree_it_;
     };
 
    public:
@@ -952,7 +552,7 @@ class Map {
     bool empty() const { return size() == 0; }
 
     iterator find(const Key& k) { return iterator(FindHelper(k).first); }
-    const_iterator find(const Key& k) const { return FindHelper(k).first; }
+    const_iterator find(const Key& k) const { return find(k, NULL); }
 
     // In traditional C++ style, this performs "insert if not present."
     std::pair<iterator, bool> insert(const KeyValuePair& kv) {
@@ -999,7 +599,8 @@ class Map {
 
     void erase(iterator it) {
       GOOGLE_DCHECK_EQ(it.m_, this);
-      const bool is_list = it.revalidate_if_necessary();
+      typename Tree::iterator tree_it;
+      const bool is_list = it.revalidate_if_necessary(&tree_it);
       size_type b = it.bucket_index_;
       Node* const item = it.node_;
       if (is_list) {
@@ -1010,7 +611,7 @@ class Map {
       } else {
         GOOGLE_DCHECK(TableEntryIsTree(b));
         Tree* tree = static_cast<Tree*>(table_[b]);
-        tree->erase(it.tree_it_);
+        tree->erase(*tree_it);
         if (tree->empty()) {
           // Force b to be the minimum of b and b ^ 1.  This is important
           // only because we want index_of_first_non_null_ to be correct.
@@ -1030,7 +631,14 @@ class Map {
     }
 
    private:
+    const_iterator find(const Key& k, TreeIterator* it) const {
+      return FindHelper(k, it).first;
+    }
     std::pair<const_iterator, size_type> FindHelper(const Key& k) const {
+      return FindHelper(k, NULL);
+    }
+    std::pair<const_iterator, size_type> FindHelper(const Key& k,
+                                                    TreeIterator* it) const {
       size_type b = BucketNumber(k);
       if (TableEntryIsNonEmptyList(b)) {
         Node* node = static_cast<Node*>(table_[b]);
@@ -1048,6 +656,7 @@ class Map {
         Key* key = const_cast<Key*>(&k);
         typename Tree::iterator tree_it = tree->find(key);
         if (tree_it != tree->end()) {
+          if (it != NULL) *it = tree_it;
           return std::make_pair(const_iterator(tree_it, this, b), b);
         }
       }
@@ -1131,7 +740,7 @@ class Map {
           return true;
         }
       } else if (GOOGLE_PREDICT_FALSE(new_size <= lo_cutoff &&
-                               num_buckets_ > kMinTableSize)) {
+                                    num_buckets_ > kMinTableSize)) {
         size_type lg2_of_size_reduction_factor = 1;
         // It's possible we want to shrink a lot here... size() could even be 0.
         // So, estimate how much to shrink by making sure we don't shrink so
@@ -1273,14 +882,7 @@ class Map {
     size_type BucketNumber(const Key& k) const {
       // We inherit from hasher, so one-arg operator() provides a hash function.
       size_type h = (*const_cast<InnerMap*>(this))(k);
-      // To help prevent people from making assumptions about the hash function,
-      // we use the seed differently depending on NDEBUG.  The default hash
-      // function, the seeding, etc., are all likely to change in the future.
-#ifndef NDEBUG
-      return (h * (seed_ | 1)) & (num_buckets_ - 1);
-#else
       return (h + seed_) & (num_buckets_ - 1);
-#endif
     }
 
     bool IsMatch(const Key& k0, const Key& k1) const {
@@ -1290,7 +892,9 @@ class Map {
     // Return a power of two no less than max(kMinTableSize, n).
     // Assumes either n < kMinTableSize or n is a power of two.
     size_type TableSize(size_type n) {
-      return n < kMinTableSize ? kMinTableSize : n;
+      return n < static_cast<size_type>(kMinTableSize)
+                 ? static_cast<size_type>(kMinTableSize)
+                 : n;
     }
 
     // Use alloc_ to allocate an array of n objects of type U.
@@ -1328,16 +932,6 @@ class Map {
 
     // Return a randomish value.
     size_type Seed() const {
-      // random_device can throw, so avoid it unless we are compiling with
-      // exceptions enabled.
-#if __cpp_exceptions && LANG_CXX11
-      try {
-        std::random_device rd;
-        std::knuth_b knuth(rd());
-        std::uniform_int_distribution<size_type> u;
-        return u(knuth);
-      } catch (...) { }
-#endif
       size_type s = static_cast<size_type>(reinterpret_cast<uintptr_t>(this));
 #if defined(__x86_64__) && defined(__GNUC__)
       uint32 hi, lo;
@@ -1356,72 +950,34 @@ class Map {
     GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(InnerMap);
   };  // end of class InnerMap
 
-  typedef hash_map<Key, value_type*, hash<Key>, std::equal_to<Key>,
-                   MapAllocator<std::pair<const Key, MapPair<Key, T>*> > >
-      DeprecatedInnerMap;
-
  public:
   // Iterators
-  class iterator_base {
-   public:
-    // We support "old style" and "new style" iterators for now. This is
-    // temporary.  Also, for "iterator()" we have an unknown category.
-    // TODO(gpike): get rid of this.
-    enum IteratorStyle { kUnknown, kOld, kNew };
-    explicit iterator_base(IteratorStyle style) : iterator_style_(style) {}
-
-    bool OldStyle() const {
-      GOOGLE_DCHECK_NE(iterator_style_, kUnknown);
-      return iterator_style_ == kOld;
-    }
-    bool UnknownStyle() const {
-      return iterator_style_ == kUnknown;
-    }
-    bool SameStyle(const iterator_base& other) const {
-      return iterator_style_ == other.iterator_style_;
-    }
-
-   private:
-    IteratorStyle iterator_style_;
-  };
-
-  class const_iterator
-      : private iterator_base,
-        public std::iterator<std::forward_iterator_tag, value_type, ptrdiff_t,
-                             const value_type*, const value_type&> {
+  class const_iterator {
     typedef typename InnerMap::const_iterator InnerIt;
-    typedef typename DeprecatedInnerMap::const_iterator DeprecatedInnerIt;
 
    public:
-    const_iterator() : iterator_base(iterator_base::kUnknown) {}
-    explicit const_iterator(const DeprecatedInnerIt& dit)
-        : iterator_base(iterator_base::kOld), dit_(dit) {}
-    explicit const_iterator(const InnerIt& it)
-        : iterator_base(iterator_base::kNew), it_(it) {}
+    typedef std::forward_iterator_tag iterator_category;
+    typedef typename Map::value_type value_type;
+    typedef ptrdiff_t difference_type;
+    typedef const value_type* pointer;
+    typedef const value_type& reference;
 
-    const_iterator(const const_iterator& other)
-        : iterator_base(other), it_(other.it_), dit_(other.dit_) {}
+    const_iterator() {}
+    explicit const_iterator(const InnerIt& it) : it_(it) {}
 
     const_reference operator*() const {
-      return this->OldStyle() ? *dit_->second : *it_->value();
+      return *it_->value();
     }
     const_pointer operator->() const { return &(operator*()); }
 
     const_iterator& operator++() {
-      if (this->OldStyle())
-        ++dit_;
-      else
-        ++it_;
+      ++it_;
       return *this;
     }
-    const_iterator operator++(int) {
-      return this->OldStyle() ? const_iterator(dit_++) : const_iterator(it_++);
-    }
+    const_iterator operator++(int) { return const_iterator(it_++); }
 
     friend bool operator==(const const_iterator& a, const const_iterator& b) {
-      if (!a.SameStyle(b)) return false;
-      if (a.UnknownStyle()) return true;
-      return a.OldStyle() ? (a.dit_ == b.dit_) : (a.it_ == b.it_);
+      return a.it_ == b.it_;
     }
     friend bool operator!=(const const_iterator& a, const const_iterator& b) {
       return !(a == b);
@@ -1429,48 +985,37 @@ class Map {
 
    private:
     InnerIt it_;
-    DeprecatedInnerIt dit_;
   };
 
-  class iterator : private iterator_base,
-                   public std::iterator<std::forward_iterator_tag, value_type> {
+  class iterator {
     typedef typename InnerMap::iterator InnerIt;
-    typedef typename DeprecatedInnerMap::iterator DeprecatedInnerIt;
 
    public:
-    iterator() : iterator_base(iterator_base::kUnknown) {}
-    explicit iterator(const DeprecatedInnerIt& dit)
-        : iterator_base(iterator_base::kOld), dit_(dit) {}
-    explicit iterator(const InnerIt& it)
-        : iterator_base(iterator_base::kNew), it_(it) {}
+    typedef std::forward_iterator_tag iterator_category;
+    typedef typename Map::value_type value_type;
+    typedef ptrdiff_t difference_type;
+    typedef value_type* pointer;
+    typedef value_type& reference;
 
-    reference operator*() const {
-      return this->OldStyle() ? *dit_->second : *it_->value();
-    }
+    iterator() {}
+    explicit iterator(const InnerIt& it) : it_(it) {}
+
+    reference operator*() const { return *it_->value(); }
     pointer operator->() const { return &(operator*()); }
 
     iterator& operator++() {
-      if (this->OldStyle())
-        ++dit_;
-      else
-        ++it_;
+      ++it_;
       return *this;
     }
-    iterator operator++(int) {
-      return this->OldStyle() ? iterator(dit_++) : iterator(it_++);
-    }
+    iterator operator++(int) { return iterator(it_++); }
 
     // Allow implicit conversion to const_iterator.
     operator const_iterator() const {
-      return this->OldStyle() ?
-          const_iterator(typename DeprecatedInnerMap::const_iterator(dit_)) :
-          const_iterator(typename InnerMap::const_iterator(it_));
+      return const_iterator(typename InnerMap::const_iterator(it_));
     }
 
     friend bool operator==(const iterator& a, const iterator& b) {
-      if (!a.SameStyle(b)) return false;
-      if (a.UnknownStyle()) return true;
-      return a.OldStyle() ? a.dit_ == b.dit_ : a.it_ == b.it_;
+      return a.it_ == b.it_;
     }
     friend bool operator!=(const iterator& a, const iterator& b) {
       return !(a == b);
@@ -1480,38 +1025,26 @@ class Map {
     friend class Map;
 
     InnerIt it_;
-    DeprecatedInnerIt dit_;
   };
 
-  iterator begin() {
-    return old_style_ ? iterator(deprecated_elements_->begin())
-                      : iterator(elements_->begin());
-  }
-  iterator end() {
-    return old_style_ ? iterator(deprecated_elements_->end())
-                      : iterator(elements_->end());
-  }
+  iterator begin() { return iterator(elements_->begin()); }
+  iterator end() { return iterator(elements_->end()); }
   const_iterator begin() const {
-    return old_style_ ? const_iterator(deprecated_elements_->begin())
-                      : const_iterator(iterator(elements_->begin()));
+    return const_iterator(iterator(elements_->begin()));
   }
   const_iterator end() const {
-    return old_style_ ? const_iterator(deprecated_elements_->end())
-                      : const_iterator(iterator(elements_->end()));
+    return const_iterator(iterator(elements_->end()));
   }
   const_iterator cbegin() const { return begin(); }
   const_iterator cend() const { return end(); }
 
   // Capacity
-  size_type size() const {
-    return old_style_ ? deprecated_elements_->size() : elements_->size();
-  }
+  size_type size() const { return elements_->size(); }
   bool empty() const { return size() == 0; }
 
   // Element access
   T& operator[](const key_type& key) {
-    value_type** value =
-        old_style_ ? &(*deprecated_elements_)[key] : &(*elements_)[key];
+    value_type** value =  &(*elements_)[key];
     if (*value == NULL) {
       *value = CreateValueTypeInternal(key);
       internal::MapValueInitializer<google::protobuf::is_proto_enum<T>::value,
@@ -1522,12 +1055,12 @@ class Map {
   }
   const T& at(const key_type& key) const {
     const_iterator it = find(key);
-    GOOGLE_CHECK(it != end());
+    GOOGLE_CHECK(it != end()) << "key not found: " << key;
     return it->second;
   }
   T& at(const key_type& key) {
     iterator it = find(key);
-    GOOGLE_CHECK(it != end());
+    GOOGLE_CHECK(it != end()) << "key not found: " << key;
     return it->second;
   }
 
@@ -1538,13 +1071,9 @@ class Map {
     return it == end() ? 0 : 1;
   }
   const_iterator find(const key_type& key) const {
-    return old_style_ ? const_iterator(deprecated_elements_->find(key))
-        : const_iterator(iterator(elements_->find(key)));
-  }
-  iterator find(const key_type& key) {
-    return old_style_ ? iterator(deprecated_elements_->find(key))
-                      : iterator(elements_->find(key));
+    return const_iterator(iterator(elements_->find(key)));
   }
+  iterator find(const key_type& key) { return iterator(elements_->find(key)); }
   std::pair<const_iterator, const_iterator> equal_range(
       const key_type& key) const {
     const_iterator it = find(key);
@@ -1567,23 +1096,12 @@ class Map {
 
   // insert
   std::pair<iterator, bool> insert(const value_type& value) {
-    if (old_style_) {
-      iterator it = find(value.first);
-      if (it != end()) {
-        return std::pair<iterator, bool>(it, false);
-      } else {
-        return std::pair<iterator, bool>(
-            iterator(deprecated_elements_->insert(std::pair<Key, value_type*>(
-                value.first, CreateValueTypeInternal(value))).first), true);
-      }
-    } else {
-      std::pair<typename InnerMap::iterator, bool> p =
-          elements_->insert(value.first);
-      if (p.second) {
-        p.first->value() = CreateValueTypeInternal(value);
-      }
-      return std::pair<iterator, bool>(iterator(p.first), p.second);
+    std::pair<typename InnerMap::iterator, bool> p =
+        elements_->insert(value.first);
+    if (p.second) {
+      p.first->value() = CreateValueTypeInternal(value);
     }
+    return std::pair<iterator, bool>(iterator(p.first), p.second);
   }
   template <class InputIt>
   void insert(InputIt first, InputIt last) {
@@ -1594,6 +1112,9 @@ class Map {
       }
     }
   }
+  void insert(std::initializer_list<value_type> values) {
+    insert(values.begin(), values.end());
+  }
 
   // Erase and clear
   size_type erase(const key_type& key) {
@@ -1608,10 +1129,7 @@ class Map {
   iterator erase(iterator pos) {
     if (arena_ == NULL) delete pos.operator->();
     iterator i = pos++;
-    if (old_style_)
-      deprecated_elements_->erase(i.dit_);
-    else
-      elements_->erase(i.it_);
+    elements_->erase(i.it_);
     return pos;
   }
   void erase(iterator first, iterator last) {
@@ -1631,13 +1149,9 @@ class Map {
   }
 
   void swap(Map& other) {
-    if (arena_ == other.arena_ && old_style_ == other.old_style_) {
+    if (arena_ == other.arena_) {
       std::swap(default_enum_value_, other.default_enum_value_);
-      if (old_style_) {
-        std::swap(deprecated_elements_, other.deprecated_elements_);
-      } else {
-        std::swap(elements_, other.elements_);
-      }
+      std::swap(elements_, other.elements_);
     } else {
       // TODO(zuguang): optimize this. The temporary copy can be allocated
       // in the same arena as the other message, and the "other = copy" can
@@ -1650,10 +1164,7 @@ class Map {
 
   // Access to hasher.  Currently this returns a copy, but it may
   // be modified to return a const reference in the future.
-  hasher hash_function() const {
-    return old_style_ ? deprecated_elements_->hash_function()
-                      : elements_->hash_function();
-  }
+  hasher hash_function() const { return elements_->hash_function(); }
 
  private:
   // Set default enum value only for proto2 map field whose value is enum type.
@@ -1690,19 +1201,12 @@ class Map {
 
   Arena* arena_;
   int default_enum_value_;
-  // The following is a tagged union because we support two map styles
-  // for now.
-  // TODO(gpike): get rid of the old style.
-  const bool old_style_;
-  union {
-    InnerMap* elements_;
-    DeprecatedInnerMap* deprecated_elements_;
-  };
+  InnerMap* elements_;
 
   friend class ::google::protobuf::Arena;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
-  template <typename K, typename V,
+  template <typename Derived, typename K, typename V,
             internal::WireFormatLite::FieldType key_wire_type,
             internal::WireFormatLite::FieldType value_wire_type,
             int default_enum_value>
@@ -1710,49 +1214,6 @@ class Map {
 };
 
 }  // namespace protobuf
-}  // namespace google
-
-GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_START
-template<>
-struct hash<google::protobuf::MapKey> {
-  size_t
-  operator()(const google::protobuf::MapKey& map_key) const {
-    switch (map_key.type()) {
-      case google::protobuf::FieldDescriptor::CPPTYPE_DOUBLE:
-      case google::protobuf::FieldDescriptor::CPPTYPE_FLOAT:
-      case google::protobuf::FieldDescriptor::CPPTYPE_ENUM:
-      case google::protobuf::FieldDescriptor::CPPTYPE_MESSAGE:
-        GOOGLE_LOG(FATAL) << "Unsupported";
-        break;
-      case google::protobuf::FieldDescriptor::CPPTYPE_STRING:
-        return hash<string>()(map_key.GetStringValue());
-#if defined(GOOGLE_PROTOBUF_HAVE_64BIT_HASH)
-      case google::protobuf::FieldDescriptor::CPPTYPE_INT64:
-        return hash< ::google::protobuf::int64>()(map_key.GetInt64Value());
-      case google::protobuf::FieldDescriptor::CPPTYPE_UINT64:
-        return hash< ::google::protobuf::uint64>()(map_key.GetUInt64Value());
-#else
-      case google::protobuf::FieldDescriptor::CPPTYPE_INT64:
-      case google::protobuf::FieldDescriptor::CPPTYPE_UINT64:
-        GOOGLE_LOG(FATAL) << "Unsupported on this platform.";
-        break;
-#endif
-      case google::protobuf::FieldDescriptor::CPPTYPE_INT32:
-        return hash< ::google::protobuf::int32>()(map_key.GetInt32Value());
-      case google::protobuf::FieldDescriptor::CPPTYPE_UINT32:
-        return hash< ::google::protobuf::uint32>()(map_key.GetUInt32Value());
-      case google::protobuf::FieldDescriptor::CPPTYPE_BOOL:
-        return hash<bool>()(map_key.GetBoolValue());
-    }
-    GOOGLE_LOG(FATAL) << "Can't get here.";
-    return 0;
-  }
-  bool
-  operator()(const google::protobuf::MapKey& map_key1,
-             const google::protobuf::MapKey& map_key2) const {
-    return map_key1 < map_key2;
-  }
-};
-GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_END
 
+}  // namespace google
 #endif  // GOOGLE_PROTOBUF_MAP_H__
diff --git a/src/google/protobuf/map_entry.h b/src/google/protobuf/map_entry.h
index d7db9b0f..801def97 100644
--- a/src/google/protobuf/map_entry.h
+++ b/src/google/protobuf/map_entry.h
@@ -43,10 +43,9 @@ namespace google {
 namespace protobuf {
 class Arena;
 namespace internal {
-template <typename Key, typename Value,
+template <typename Derived, typename Key, typename Value,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
 class MapField;
 }
 }
@@ -54,30 +53,6 @@ class MapField;
 namespace protobuf {
 namespace internal {
 
-// Register all MapEntry default instances so we can delete them in
-// ShutdownProtobufLibrary().
-void LIBPROTOBUF_EXPORT RegisterMapEntryDefaultInstance(
-    MessageLite* default_instance);
-
-// This is the common base class for MapEntry. It is used by MapFieldBase in
-// reflection api, in which the static type of key and value is unknown.
-class LIBPROTOBUF_EXPORT MapEntryBase : public Message {
- public:
-  ::google::protobuf::Metadata GetMetadata() const {
-    ::google::protobuf::Metadata metadata;
-    metadata.descriptor = descriptor_;
-    metadata.reflection = reflection_;
-    return metadata;
-  }
-
- protected:
-  MapEntryBase() : descriptor_(NULL), reflection_(NULL) {  }
-  virtual ~MapEntryBase() {}
-
-  const Descriptor* descriptor_;
-  const Reflection* reflection_;
-};
-
 // MapEntry is the returned google::protobuf::Message when calling AddMessage of
 // google::protobuf::Reflection. In order to let it work with generated message
 // reflection, its in-memory type is the same as generated message with the same
@@ -105,212 +80,58 @@ class LIBPROTOBUF_EXPORT MapEntryBase : public Message {
 // while we need to explicitly specify the cpp type if proto type is
 // TYPE_MESSAGE to infer the in-memory type.  Moreover, default_enum_value is
 // used to initialize enum field in proto2.
-template <typename Key, typename Value,
+template <typename Derived, typename Key, typename Value,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-class MapEntry : public MapEntryBase {
-  // Provide utilities to parse/serialize key/value.  Provide utilities to
-  // manipulate internal stored type.
-  typedef MapTypeHandler<kKeyFieldType, Key> KeyTypeHandler;
-  typedef MapTypeHandler<kValueFieldType, Value> ValueTypeHandler;
-
-  // Enum type cannot be used for MapTypeHandler::Read. Define a type
-  // which will replace Enum with int.
-  typedef typename KeyTypeHandler::MapEntryAccessorType KeyMapEntryAccessorType;
-  typedef typename ValueTypeHandler::MapEntryAccessorType
-      ValueMapEntryAccessorType;
-
-  // Abbreviation for MapEntry
-  typedef typename google::protobuf::internal::MapEntry<
-      Key, Value, kKeyFieldType, kValueFieldType, default_enum_value> EntryType;
-
-  // Abbreviation for MapEntryLite
-  typedef typename google::protobuf::internal::MapEntryLite<
-      Key, Value, kKeyFieldType, kValueFieldType, default_enum_value>
-      EntryLiteType;
-
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+class MapEntry
+    : public MapEntryImpl<Derived, Message, Key, Value, kKeyFieldType,
+                          kValueFieldType, default_enum_value> {
  public:
-  ~MapEntry() {
-    if (this == default_instance_) {
-      delete reflection_;
-    }
-  }
-
-  // accessors ======================================================
-
-  virtual inline const KeyMapEntryAccessorType& key() const {
-    return entry_lite_.key();
-  }
-  inline KeyMapEntryAccessorType* mutable_key() {
-    return entry_lite_.mutable_key();
-  }
-  virtual inline const ValueMapEntryAccessorType& value() const {
-    return entry_lite_.value();
-  }
-  inline ValueMapEntryAccessorType* mutable_value() {
-    return entry_lite_.mutable_value();
-  }
-
-  // implements Message =============================================
-
-  bool MergePartialFromCodedStream(::google::protobuf::io::CodedInputStream* input) {
-    return entry_lite_.MergePartialFromCodedStream(input);
-  }
-
-  size_t ByteSizeLong() const {
-    return entry_lite_.ByteSizeLong();
-  }
-
-  void SerializeWithCachedSizes(::google::protobuf::io::CodedOutputStream* output) const {
-    entry_lite_.SerializeWithCachedSizes(output);
-  }
-
-  ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(bool deterministic,
-                                                   ::google::protobuf::uint8* output) const {
-    return entry_lite_.InternalSerializeWithCachedSizesToArray(deterministic,
-                                                               output);
-  }
-
-  int GetCachedSize() const {
-    return entry_lite_.GetCachedSize();
-  }
-
-  bool IsInitialized() const {
-    return entry_lite_.IsInitialized();
-  }
-
-  Message* New() const {
-    MapEntry* entry = new MapEntry;
-    entry->descriptor_ = descriptor_;
-    entry->reflection_ = reflection_;
-    entry->set_default_instance(default_instance_);
-    return entry;
-  }
-
-  Message* New(Arena* arena) const {
-    MapEntry* entry = Arena::CreateMessage<MapEntry>(arena);
-    entry->descriptor_ = descriptor_;
-    entry->reflection_ = reflection_;
-    entry->set_default_instance(default_instance_);
-    return entry;
-  }
-
-  int SpaceUsed() const {
-    int size = sizeof(MapEntry);
-    size += entry_lite_.SpaceUsed();
-    return size;
-  }
-
-  void CopyFrom(const ::google::protobuf::Message& from) {
-    Clear();
-    MergeFrom(from);
-  }
-
-  void MergeFrom(const ::google::protobuf::Message& from) {
-    GOOGLE_CHECK_NE(&from, this);
-    const MapEntry* source = dynamic_cast_if_available<const MapEntry*>(&from);
-    if (source == NULL) {
-      ReflectionOps::Merge(from, this);
-    } else {
-      MergeFrom(*source);
-    }
-  }
-
-  void CopyFrom(const MapEntry& from) {
-    Clear();
-    MergeFrom(from);
-  }
-
-  void MergeFrom(const MapEntry& from) {
-    entry_lite_.MergeFrom(from.entry_lite_);
-  }
-
-  void Clear() {
-    entry_lite_.Clear();
-  }
-
-  void InitAsDefaultInstance() {
-    entry_lite_.InitAsDefaultInstance();
-  }
-
-  Arena* GetArena() const {
-    return entry_lite_.GetArena();
-  }
-
-  // Create default MapEntry instance for given descriptor. Descriptor has to be
-  // given when creating default MapEntry instance because different map field
-  // may have the same type and MapEntry class. The given descriptor is needed
-  // to distinguish instances of the same MapEntry class.
-  static MapEntry* CreateDefaultInstance(const Descriptor* descriptor) {
-    MapEntry* entry = new MapEntry;
-    ReflectionSchema schema = {
-        entry,
-        offsets_,
-        has_bits_,
-        GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MapEntry, entry_lite_._has_bits_),
-        GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MapEntry, _internal_metadata_),
-        -1,
-        -1,
-        sizeof(MapEntry)};
-    const Reflection* reflection = new GeneratedMessageReflection(
-        descriptor, schema, DescriptorPool::generated_pool(),
-        MessageFactory::generated_factory());
-    entry->descriptor_ = descriptor;
-    entry->reflection_ = reflection;
-    entry->set_default_instance(entry);
-    entry->InitAsDefaultInstance();
-    RegisterMapEntryDefaultInstance(entry);
-    return entry;
-  }
-
- private:
-  MapEntry()
-      : _internal_metadata_(NULL), default_instance_(NULL), entry_lite_() {}
-
+  MapEntry() : _internal_metadata_(NULL) {}
   explicit MapEntry(Arena* arena)
-      : _internal_metadata_(arena),
-        default_instance_(NULL),
-        entry_lite_(arena) {}
-
-  inline Arena* GetArenaNoVirtual() const {
-    return entry_lite_.GetArenaNoVirtual();
-  }
-
-  void set_default_instance(MapEntry* default_instance) {
-    default_instance_ = default_instance;
-    entry_lite_.set_default_instance(&default_instance->entry_lite_);
-  }
+      : MapEntryImpl<Derived, Message, Key, Value, kKeyFieldType,
+                     kValueFieldType, default_enum_value>(arena),
+        _internal_metadata_(arena) {}
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
 
-  static uint32 offsets_[2];
-  static uint32 has_bits_[2];
   InternalMetadataWithArena _internal_metadata_;
-  MapEntry* default_instance_;
-  EntryLiteType entry_lite_;
 
+ private:
   friend class ::google::protobuf::Arena;
-  typedef void InternalArenaConstructable_;
-  typedef void DestructorSkippable_;
-  template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
-            WireFormatLite::FieldType, int default_enum>
+  template <typename C, typename K, typename V,
+            WireFormatLite::FieldType k_wire_type, WireFormatLite::FieldType,
+            int default_enum>
   friend class internal::MapField;
   friend class internal::GeneratedMessageReflection;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntry);
 };
 
-template <typename Key, typename Value, WireFormatLite::FieldType kKeyFieldType,
+// Specialization for the full runtime
+template <typename Derived, typename Key, typename Value,
+          WireFormatLite::FieldType kKeyFieldType,
           WireFormatLite::FieldType kValueFieldType, int default_enum_value>
-uint32 MapEntry<Key, Value, kKeyFieldType, kValueFieldType,
-             default_enum_value>::offsets_[2] = {
-    GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MapEntry, entry_lite_.key_),
-    GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(MapEntry, entry_lite_.value_),
+struct MapEntryHelper<MapEntry<Derived, Key, Value, kKeyFieldType,
+                               kValueFieldType, default_enum_value> >
+    : MapEntryHelper<MapEntryLite<Derived, Key, Value, kKeyFieldType,
+                                  kValueFieldType, default_enum_value> > {
+  explicit MapEntryHelper(const MapPair<Key, Value>& map_pair)
+      : MapEntryHelper<MapEntryLite<Derived, Key, Value, kKeyFieldType,
+                                    kValueFieldType, default_enum_value> >(
+            map_pair) {}
 };
 
-template <typename Key, typename Value, WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
-uint32 MapEntry<Key, Value, kKeyFieldType, kValueFieldType,
-             default_enum_value>::has_bits_[2] = {0, 1};
+template <typename Derived, typename K, typename V,
+          WireFormatLite::FieldType key, WireFormatLite::FieldType value,
+          int default_enum>
+struct DeconstructMapEntry<MapEntry<Derived, K, V, key, value, default_enum> > {
+  typedef K Key;
+  typedef V Value;
+  static const WireFormatLite::FieldType kKeyFieldType = key;
+  static const WireFormatLite::FieldType kValueFieldType = value;
+  static const int default_enum_value = default_enum;
+};
 
 }  // namespace internal
 }  // namespace protobuf
diff --git a/src/google/protobuf/map_entry_lite.h b/src/google/protobuf/map_entry_lite.h
index 1243911b..85a0bed7 100644
--- a/src/google/protobuf/map_entry_lite.h
+++ b/src/google/protobuf/map_entry_lite.h
@@ -32,22 +32,25 @@
 #define GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__
 
 #include <assert.h>
+
+#include <google/protobuf/stubs/casts.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/arenastring.h>
+#include <google/protobuf/map.h>
 #include <google/protobuf/map_type_handler.h>
+#include <google/protobuf/stubs/port.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 
 namespace google {
 namespace protobuf {
-class Arena;
 namespace internal {
-template <typename Key, typename Value,
+template <typename Derived, typename Key, typename Value,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
 class MapEntry;
-template <typename Key, typename Value,
+template <typename Derived, typename Key, typename Value,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
 class MapFieldLite;
 }  // namespace internal
 }  // namespace protobuf
@@ -87,13 +90,14 @@ struct MoveHelper<false, false, true, T> {  // strings and similar
   }
 };
 
-// MapEntryLite is used to implement parsing and serialization of map for lite
-// runtime.
-template <typename Key, typename Value,
+// MapEntryImpl is used to implement parsing and serialization of map entries.
+// It uses Curious Recursive Template Pattern (CRTP) to provide the type of
+// the eventual code to the template code.
+template <typename Derived, typename Base, typename Key, typename Value,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-class MapEntryLite : public MessageLite {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+class MapEntryImpl : public Base {
+ protected:
   // Provide utilities to parse/serialize key/value.  Provide utilities to
   // manipulate internal stored type.
   typedef MapTypeHandler<kKeyFieldType, Key> KeyTypeHandler;
@@ -122,12 +126,33 @@ class MapEntryLite : public MessageLite {
   static const size_t kTagSize = 1;
 
  public:
-  ~MapEntryLite() {
-    if (this != default_instance_) {
-      if (GetArenaNoVirtual() != NULL) return;
-      KeyTypeHandler::DeleteNoArena(key_);
-      ValueTypeHandler::DeleteNoArena(value_);
-    }
+  // Work-around for a compiler bug (see repeated_field.h).
+  typedef void MapEntryHasMergeTypeTrait;
+  typedef Derived EntryType;
+  typedef Key EntryKeyType;
+  typedef Value EntryValueType;
+  static const WireFormatLite::FieldType kEntryKeyFieldType = kKeyFieldType;
+  static const WireFormatLite::FieldType kEntryValueFieldType = kValueFieldType;
+  static const int kEntryDefaultEnumValue = default_enum_value;
+
+  MapEntryImpl() : arena_(NULL) {
+    KeyTypeHandler::Initialize(&key_, NULL);
+    ValueTypeHandler::InitializeMaybeByDefaultEnum(&value_, default_enum_value,
+                                                   NULL);
+    _has_bits_[0] = 0;
+  }
+
+  explicit MapEntryImpl(Arena* arena) : arena_(arena) {
+    KeyTypeHandler::Initialize(&key_, arena);
+    ValueTypeHandler::InitializeMaybeByDefaultEnum(&value_, default_enum_value,
+                                                   arena);
+    _has_bits_[0] = 0;
+  }
+
+  ~MapEntryImpl() {
+    if (GetArenaNoVirtual() != NULL) return;
+    KeyTypeHandler::DeleteNoArena(key_);
+    ValueTypeHandler::DeleteNoArena(value_);
   }
 
   // accessors ======================================================
@@ -136,9 +161,8 @@ class MapEntryLite : public MessageLite {
     return KeyTypeHandler::GetExternalReference(key_);
   }
   virtual inline const ValueMapEntryAccessorType& value() const {
-    GOOGLE_CHECK(default_instance_ != NULL);
-    return ValueTypeHandler::DefaultIfNotInitialized(value_,
-                                                    default_instance_->value_);
+    return ValueTypeHandler::DefaultIfNotInitialized(
+        value_, Derived::internal_default_instance()->value_);
   }
   inline KeyMapEntryAccessorType* mutable_key() {
     set_has_key();
@@ -151,12 +175,12 @@ class MapEntryLite : public MessageLite {
 
   // implements MessageLite =========================================
 
-  // MapEntryLite is for implementation only and this function isn't called
+  // MapEntryImpl is for implementation only and this function isn't called
   // anywhere. Just provide a fake implementation here for MessageLite.
   string GetTypeName() const { return ""; }
 
   void CheckTypeAndMergeFrom(const MessageLite& other) {
-    MergeFrom(*::google::protobuf::down_cast<const MapEntryLite*>(&other));
+    MergeFromInternal(*::google::protobuf::down_cast<const Derived*>(&other));
   }
 
   bool MergePartialFromCodedStream(::google::protobuf::io::CodedInputStream* input) {
@@ -178,8 +202,7 @@ class MapEntryLite : public MessageLite {
             return false;
           }
           set_has_key();
-          if (!input->ExpectTag(kValueTag)) break;
-          GOOGLE_FALLTHROUGH_INTENDED;
+          break;
 
         case kValueTag:
           if (!ValueTypeHandler::Read(input, mutable_value())) {
@@ -203,8 +226,10 @@ class MapEntryLite : public MessageLite {
 
   size_t ByteSizeLong() const {
     size_t size = 0;
-    size += has_key() ? kTagSize + KeyTypeHandler::ByteSize(key()) : 0;
-    size += has_value() ? kTagSize + ValueTypeHandler::ByteSize(value()) : 0;
+    size += has_key() ?
+        kTagSize + static_cast<size_t>(KeyTypeHandler::ByteSize(key())) : 0;
+    size += has_value() ?
+        kTagSize + static_cast<size_t>(ValueTypeHandler::ByteSize(value())) : 0;
     return size;
   }
 
@@ -227,37 +252,37 @@ class MapEntryLite : public MessageLite {
   int GetCachedSize() const {
     int size = 0;
     size += has_key()
-        ? kTagSize + KeyTypeHandler::GetCachedSize(key())
+        ? static_cast<int>(kTagSize) + KeyTypeHandler::GetCachedSize(key())
         : 0;
     size += has_value()
-        ? kTagSize + ValueTypeHandler::GetCachedSize(
-            value())
+        ? static_cast<int>(kTagSize) + ValueTypeHandler::GetCachedSize(value())
         : 0;
     return size;
   }
 
   bool IsInitialized() const { return ValueTypeHandler::IsInitialized(value_); }
 
-  MessageLite* New() const {
-    MapEntryLite* entry = new MapEntryLite;
-    entry->default_instance_ = default_instance_;
+  Base* New() const {
+    Derived* entry = new Derived;
     return entry;
   }
 
-  MessageLite* New(Arena* arena) const {
-    MapEntryLite* entry = Arena::CreateMessage<MapEntryLite>(arena);
-    entry->default_instance_ = default_instance_;
+  Base* New(Arena* arena) const {
+    Derived* entry = Arena::CreateMessage<Derived>(arena);
     return entry;
   }
 
-  int SpaceUsed() const {
-    int size = sizeof(MapEntryLite);
-    size += KeyTypeHandler::SpaceUsedInMapEntry(key_);
-    size += ValueTypeHandler::SpaceUsedInMapEntry(value_);
+  size_t SpaceUsedLong() const {
+    size_t size = sizeof(Derived);
+    size += KeyTypeHandler::SpaceUsedInMapEntryLong(key_);
+    size += ValueTypeHandler::SpaceUsedInMapEntryLong(value_);
     return size;
   }
 
-  void MergeFrom(const MapEntryLite& from) {
+ protected:
+  // We can't declare this function directly here as it would hide the other
+  // overload (const Message&).
+  void MergeFromInternal(const MapEntryImpl& from) {
     if (from._has_bits_[0]) {
       if (from.has_key()) {
         KeyTypeHandler::EnsureMutable(&key_, GetArenaNoVirtual());
@@ -272,6 +297,7 @@ class MapEntryLite : public MessageLite {
     }
   }
 
+ public:
   void Clear() {
     KeyTypeHandler::Clear(&key_, GetArenaNoVirtual());
     ValueTypeHandler::ClearMaybeByDefaultEnum(
@@ -280,33 +306,28 @@ class MapEntryLite : public MessageLite {
     clear_has_value();
   }
 
-  void InitAsDefaultInstance() {
-    KeyTypeHandler::AssignDefaultValue(&key_);
-    ValueTypeHandler::AssignDefaultValue(&value_);
+  static void InitAsDefaultInstance() {
+    Derived* d = const_cast<Derived*>(Derived::internal_default_instance());
+    KeyTypeHandler::AssignDefaultValue(&d->key_);
+    ValueTypeHandler::AssignDefaultValue(&d->value_);
   }
 
   Arena* GetArena() const {
     return GetArenaNoVirtual();
   }
 
-  // Create a MapEntryLite for given key and value from google::protobuf::Map in
+  // Create a MapEntryImpl for given key and value from google::protobuf::Map in
   // serialization. This function is only called when value is enum. Enum is
   // treated differently because its type in MapEntry is int and its type in
   // google::protobuf::Map is enum. We cannot create a reference to int from an enum.
-  static MapEntryLite* EnumWrap(const Key& key, const Value value,
-                                Arena* arena) {
-    return Arena::CreateMessage<MapEnumEntryWrapper<
-        Key, Value, kKeyFieldType, kValueFieldType, default_enum_value> >(
-        arena, key, value);
+  static Derived* EnumWrap(const Key& key, const Value value, Arena* arena) {
+    return Arena::CreateMessage<MapEnumEntryWrapper>(arena, key, value);
   }
 
   // Like above, but for all the other types. This avoids value copy to create
-  // MapEntryLite from google::protobuf::Map in serialization.
-  static MapEntryLite* Wrap(const Key& key, const Value& value, Arena* arena) {
-    return Arena::CreateMessage<MapEntryWrapper<Key, Value, kKeyFieldType,
-                                                kValueFieldType,
-                                                default_enum_value> >(
-        arena, key, value);
+  // MapEntryImpl from google::protobuf::Map in serialization.
+  static Derived* Wrap(const Key& key, const Value& value, Arena* arena) {
+    return Arena::CreateMessage<MapEntryWrapper>(arena, key, value);
   }
 
   // Parsing using MergePartialFromCodedStream, above, is not as
@@ -334,9 +355,9 @@ class MapEntryLite : public MessageLite {
         // We could use memcmp here, but we don't bother. The tag is one byte.
         GOOGLE_COMPILE_ASSERT(kTagSize == 1, tag_size_error);
         if (size > 0 && *reinterpret_cast<const char*>(data) == kValueTag) {
-          typename Map::size_type size = map_->size();
+          typename Map::size_type map_size = map_->size();
           value_ptr_ = &(*map_)[key_];
-          if (GOOGLE_PREDICT_TRUE(size != map_->size())) {
+          if (GOOGLE_PREDICT_TRUE(map_size != map_->size())) {
             // We created a new key-value pair.  Fill in the value.
             typedef
                 typename MapIf<ValueTypeHandler::kIsEnum, int*, Value*>::type T;
@@ -366,7 +387,7 @@ class MapEntryLite : public MessageLite {
     const Value& value() const { return *value_ptr_; }
 
    private:
-    void UseKeyAndValueFromEntry() GOOGLE_ATTRIBUTE_COLD {
+    void UseKeyAndValueFromEntry() GOOGLE_PROTOBUF_ATTRIBUTE_COLD {
       // Update key_ in case we need it later (because key() is called).
       // This is potentially inefficient, especially if the key is
       // expensive to copy (e.g., a long string), but this is a cold
@@ -384,7 +405,7 @@ class MapEntryLite : public MessageLite {
     // into map_, we are not at the end of the input.  This is unusual, but
     // allowed by the spec.
     bool ReadBeyondKeyValuePair(::google::protobuf::io::CodedInputStream* input)
-        GOOGLE_ATTRIBUTE_COLD {
+        GOOGLE_PROTOBUF_ATTRIBUTE_COLD {
       typedef MoveHelper<KeyTypeHandler::kIsEnum,
                          KeyTypeHandler::kIsMessage,
                          KeyTypeHandler::kWireType ==
@@ -411,7 +432,7 @@ class MapEntryLite : public MessageLite {
     Value* value_ptr_;
     // On the fast path entry_ is not used.  And, when entry_ is used, it's set
     // to mf_->NewEntry(), so in the arena case we must call entry_.release.
-    google::protobuf::scoped_ptr<MapEntryLite> entry_;
+    std::unique_ptr<MapEntryImpl> entry_;
   };
 
  protected:
@@ -433,21 +454,17 @@ class MapEntryLite : public MessageLite {
   // involves copy of key and value to construct a MapEntry. In order to avoid
   // this copy in constructing a MapEntry, we need the following class which
   // only takes references of given key and value.
-  template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
-            WireFormatLite::FieldType v_wire_type, int default_enum>
-  class MapEntryWrapper
-      : public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
-    typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
-    typedef typename Base::KeyMapEntryAccessorType KeyMapEntryAccessorType;
-    typedef typename Base::ValueMapEntryAccessorType ValueMapEntryAccessorType;
+  class MapEntryWrapper : public Derived {
+    typedef Derived BaseClass;
+    typedef typename BaseClass::KeyMapEntryAccessorType KeyMapEntryAccessorType;
+    typedef
+        typename BaseClass::ValueMapEntryAccessorType ValueMapEntryAccessorType;
 
    public:
-    MapEntryWrapper(Arena* arena, const K& key, const V& value)
-        : MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
-          key_(key),
-          value_(value) {
-      Base::set_has_key();
-      Base::set_has_value();
+    MapEntryWrapper(Arena* arena, const Key& key, const Value& value)
+        : Derived(arena), key_(key), value_(value) {
+      BaseClass::set_has_key();
+      BaseClass::set_has_value();
     }
     inline const KeyMapEntryAccessorType& key() const { return key_; }
     inline const ValueMapEntryAccessorType& value() const { return value_; }
@@ -467,21 +484,17 @@ class MapEntryLite : public MessageLite {
   // initialize a reference to int with a reference to enum, compiler will
   // generate a temporary int from enum and initialize the reference to int with
   // the temporary.
-  template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
-            WireFormatLite::FieldType v_wire_type, int default_enum>
-  class MapEnumEntryWrapper
-      : public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
-    typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
-    typedef typename Base::KeyMapEntryAccessorType KeyMapEntryAccessorType;
-    typedef typename Base::ValueMapEntryAccessorType ValueMapEntryAccessorType;
+  class MapEnumEntryWrapper : public Derived {
+    typedef Derived BaseClass;
+    typedef typename BaseClass::KeyMapEntryAccessorType KeyMapEntryAccessorType;
+    typedef
+        typename BaseClass::ValueMapEntryAccessorType ValueMapEntryAccessorType;
 
    public:
-    MapEnumEntryWrapper(Arena* arena, const K& key, const V& value)
-        : MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
-          key_(key),
-          value_(value) {
-      Base::set_has_key();
-      Base::set_has_value();
+    MapEnumEntryWrapper(Arena* arena, const Key& key, const Value& value)
+        : Derived(arena), key_(key), value_(value) {
+      BaseClass::set_has_key();
+      BaseClass::set_has_value();
     }
     inline const KeyMapEntryAccessorType& key() const { return key_; }
     inline const ValueMapEntryAccessorType& value() const { return value_; }
@@ -494,48 +507,62 @@ class MapEntryLite : public MessageLite {
     typedef void DestructorSkippable_;
   };
 
-  MapEntryLite() : default_instance_(NULL), arena_(NULL) {
-    KeyTypeHandler::Initialize(&key_, NULL);
-    ValueTypeHandler::InitializeMaybeByDefaultEnum(
-        &value_, default_enum_value, NULL);
-    _has_bits_[0] = 0;
-  }
-
-  explicit MapEntryLite(Arena* arena)
-      : default_instance_(NULL), arena_(arena) {
-    KeyTypeHandler::Initialize(&key_, arena);
-    ValueTypeHandler::InitializeMaybeByDefaultEnum(
-        &value_, default_enum_value, arena);
-    _has_bits_[0] = 0;
-  }
-
   inline Arena* GetArenaNoVirtual() const {
     return arena_;
   }
 
-  void set_default_instance(MapEntryLite* default_instance) {
-    default_instance_ = default_instance;
-  }
-
-  MapEntryLite* default_instance_;
-
+ public:  // Needed for constructing tables
   KeyOnMemory key_;
   ValueOnMemory value_;
   Arena* arena_;
   uint32 _has_bits_[1];
 
+ private:
   friend class ::google::protobuf::Arena;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
-  template <typename K, typename V, WireFormatLite::FieldType,
+  template <typename C, typename K, typename V, WireFormatLite::FieldType,
             WireFormatLite::FieldType, int>
   friend class internal::MapEntry;
-  template <typename K, typename V, WireFormatLite::FieldType,
+  template <typename C, typename K, typename V, WireFormatLite::FieldType,
             WireFormatLite::FieldType, int>
   friend class internal::MapFieldLite;
 
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntryImpl);
+};
+
+template <typename T, typename Key, typename Value,
+          WireFormatLite::FieldType kKeyFieldType,
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+class MapEntryLite
+    : public MapEntryImpl<T, MessageLite, Key, Value, kKeyFieldType,
+                          kValueFieldType, default_enum_value> {
+ public:
+  typedef MapEntryImpl<T, MessageLite, Key, Value, kKeyFieldType,
+                       kValueFieldType, default_enum_value>
+      SuperType;
+  MapEntryLite() {}
+  explicit MapEntryLite(Arena* arena) : SuperType(arena) {}
+  void MergeFrom(const MapEntryLite& other) { MergeFromInternal(other); }
+
+ private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntryLite);
 };
+// The completely unprincipled and unwieldy use of template parameters in
+// the map code necessitates wrappers to make the code a little bit more
+// manageable.
+template <typename Derived>
+struct DeconstructMapEntry;
+
+template <typename T, typename K, typename V, WireFormatLite::FieldType key,
+          WireFormatLite::FieldType value, int default_enum>
+struct DeconstructMapEntry<MapEntryLite<T, K, V, key, value, default_enum> > {
+  typedef K Key;
+  typedef V Value;
+  static const WireFormatLite::FieldType kKeyFieldType = key;
+  static const WireFormatLite::FieldType kValueFieldType = value;
+  static const int default_enum_value = default_enum;
+};
 
 // Helpers for deterministic serialization =============================
 
@@ -563,6 +590,80 @@ template <typename T> struct CompareByDerefFirst {
   }
 };
 
+// Helper for table driven serialization
+
+template <WireFormatLite::FieldType FieldType>
+struct FromHelper {
+  template <typename T>
+  static const T& From(const T& x) {
+    return x;
+  }
+};
+
+template <>
+struct FromHelper<WireFormatLite::TYPE_STRING> {
+  static ArenaStringPtr From(const string& x) {
+    ArenaStringPtr res;
+    TaggedPtr<::std::string> ptr;
+    ptr.Set(const_cast<string*>(&x));
+    res.UnsafeSetTaggedPointer(ptr);
+    return res;
+  }
+};
+template <>
+struct FromHelper<WireFormatLite::TYPE_BYTES> {
+  static ArenaStringPtr From(const string& x) {
+    ArenaStringPtr res;
+    TaggedPtr<::std::string> ptr;
+    ptr.Set(const_cast<string*>(&x));
+    res.UnsafeSetTaggedPointer(ptr);
+    return res;
+  }
+};
+template <>
+struct FromHelper<WireFormatLite::TYPE_MESSAGE> {
+  template <typename T>
+  static T* From(const T& x) {
+    return const_cast<T*>(&x);
+  }
+};
+
+template <typename MapEntryType>
+struct MapEntryHelper;
+
+template <typename T, typename Key, typename Value,
+          WireFormatLite::FieldType kKeyFieldType,
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+struct MapEntryHelper<MapEntryLite<T, Key, Value, kKeyFieldType,
+                                   kValueFieldType, default_enum_value> > {
+  // Provide utilities to parse/serialize key/value.  Provide utilities to
+  // manipulate internal stored type.
+  typedef MapTypeHandler<kKeyFieldType, Key> KeyTypeHandler;
+  typedef MapTypeHandler<kValueFieldType, Value> ValueTypeHandler;
+
+  // Define internal memory layout. Strings and messages are stored as
+  // pointers, while other types are stored as values.
+  typedef typename KeyTypeHandler::TypeOnMemory KeyOnMemory;
+  typedef typename ValueTypeHandler::TypeOnMemory ValueOnMemory;
+
+  explicit MapEntryHelper(const MapPair<Key, Value>& map_pair)
+      : _has_bits_(3),
+        _cached_size_(2 + KeyTypeHandler::GetCachedSize(map_pair.first) +
+                      ValueTypeHandler::GetCachedSize(map_pair.second)),
+        key_(FromHelper<kKeyFieldType>::From(map_pair.first)),
+        value_(FromHelper<kValueFieldType>::From(map_pair.second)) {}
+
+  // Purposely not folowing the style guide naming. These are the names
+  // the proto compiler would generate given the map entry descriptor.
+  // The proto compiler generates the offsets in this struct as if this was
+  // a regular message. This way the table driven code barely notices it's
+  // dealing with a map field.
+  uint32 _has_bits_;     // NOLINT
+  uint32 _cached_size_;  // NOLINT
+  KeyOnMemory key_;      // NOLINT
+  ValueOnMemory value_;  // NOLINT
+};
+
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/map_field.cc b/src/google/protobuf/map_field.cc
index 49f91818..ac29c7e9 100644
--- a/src/google/protobuf/map_field.cc
+++ b/src/google/protobuf/map_field.cc
@@ -37,86 +37,74 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
-ProtobufOnceType map_entry_default_instances_once_;
-Mutex* map_entry_default_instances_mutex_;
-vector<MessageLite*>* map_entry_default_instances_;
-
-void DeleteMapEntryDefaultInstances() {
-  for (int i = 0; i < map_entry_default_instances_->size(); ++i) {
-    delete map_entry_default_instances_->at(i);
-  }
-  delete map_entry_default_instances_mutex_;
-  delete map_entry_default_instances_;
-}
-
-void InitMapEntryDefaultInstances() {
-  map_entry_default_instances_mutex_ = new Mutex();
-  map_entry_default_instances_ = new vector<MessageLite*>();
-  OnShutdown(&DeleteMapEntryDefaultInstances);
-}
-
-void RegisterMapEntryDefaultInstance(MessageLite* default_instance) {
-  ::google::protobuf::GoogleOnceInit(&map_entry_default_instances_once_,
-                 &InitMapEntryDefaultInstances);
-  MutexLock lock(map_entry_default_instances_mutex_);
-  map_entry_default_instances_->push_back(default_instance);
-}
-
 MapFieldBase::~MapFieldBase() {
   if (repeated_field_ != NULL && arena_ == NULL) delete repeated_field_;
 }
 
 const RepeatedPtrFieldBase& MapFieldBase::GetRepeatedField() const {
   SyncRepeatedFieldWithMap();
-  return *repeated_field_;
+  return *reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+      repeated_field_);
 }
 
 RepeatedPtrFieldBase* MapFieldBase::MutableRepeatedField() {
   SyncRepeatedFieldWithMap();
   SetRepeatedDirty();
-  return repeated_field_;
+  return reinterpret_cast<::google::protobuf::internal::RepeatedPtrFieldBase*>(
+      repeated_field_);
 }
 
-int MapFieldBase::SpaceUsedExcludingSelf() const {
+size_t MapFieldBase::SpaceUsedExcludingSelfLong() const {
   mutex_.Lock();
-  int size = SpaceUsedExcludingSelfNoLock();
+  size_t size = SpaceUsedExcludingSelfNoLock();
   mutex_.Unlock();
   return size;
 }
 
-int MapFieldBase::SpaceUsedExcludingSelfNoLock() const {
+size_t MapFieldBase::SpaceUsedExcludingSelfNoLock() const {
   if (repeated_field_ != NULL) {
-    return repeated_field_->SpaceUsedExcludingSelf();
+    return repeated_field_->SpaceUsedExcludingSelfLong();
   } else {
     return 0;
   }
 }
 
-void MapFieldBase::InitMetadataOnce() const {
-  GOOGLE_CHECK(entry_descriptor_ != NULL);
-  GOOGLE_CHECK(assign_descriptor_callback_ != NULL);
-  (*assign_descriptor_callback_)();
+bool MapFieldBase::IsMapValid() const {
+  // "Acquire" insures the operation after SyncRepeatedFieldWithMap won't get
+  // executed before state_ is checked.
+  int state = state_.load(std::memory_order_acquire);
+  return state != STATE_MODIFIED_REPEATED;
+}
+
+bool MapFieldBase::IsRepeatedFieldValid() const {
+  int state = state_.load(std::memory_order_acquire);
+  return state != STATE_MODIFIED_MAP;
 }
 
-void MapFieldBase::SetMapDirty() { state_ = STATE_MODIFIED_MAP; }
+void MapFieldBase::SetMapDirty() {
+  // These are called by (non-const) mutator functions. So by our API it's the
+  // callers responsibility to have these calls properly ordered.
+  state_.store(STATE_MODIFIED_MAP, std::memory_order_relaxed);
+}
 
-void MapFieldBase::SetRepeatedDirty() { state_ = STATE_MODIFIED_REPEATED; }
+void MapFieldBase::SetRepeatedDirty() {
+  // These are called by (non-const) mutator functions. So by our API it's the
+  // callers responsibility to have these calls properly ordered.
+  state_.store(STATE_MODIFIED_REPEATED, std::memory_order_relaxed);
+}
 
 void* MapFieldBase::MutableRepeatedPtrField() const { return repeated_field_; }
 
 void MapFieldBase::SyncRepeatedFieldWithMap() const {
-  // "Acquire" insures the operation after SyncRepeatedFieldWithMap won't get
-  // executed before state_ is checked.
-  Atomic32 state = google::protobuf::internal::Acquire_Load(&state_);
-  if (state == STATE_MODIFIED_MAP) {
+  // acquire here matches with release below to ensure that we can only see a
+  // value of CLEAN after all previous changes have been synced.
+  if (state_.load(std::memory_order_acquire) == STATE_MODIFIED_MAP) {
     mutex_.Lock();
     // Double check state, because another thread may have seen the same state
     // and done the synchronization before the current thread.
-    if (state_ == STATE_MODIFIED_MAP) {
+    if (state_.load(std::memory_order_relaxed) == STATE_MODIFIED_MAP) {
       SyncRepeatedFieldWithMapNoLock();
-      // "Release" insures state_ can only be changed "after"
-      // SyncRepeatedFieldWithMapNoLock is finished.
-      google::protobuf::internal::Release_Store(&state_, CLEAN);
+      state_.store(CLEAN, std::memory_order_release);
     }
     mutex_.Unlock();
   }
@@ -129,18 +117,15 @@ void MapFieldBase::SyncRepeatedFieldWithMapNoLock() const {
 }
 
 void MapFieldBase::SyncMapWithRepeatedField() const {
-  // "Acquire" insures the operation after SyncMapWithRepeatedField won't get
-  // executed before state_ is checked.
-  Atomic32 state = google::protobuf::internal::Acquire_Load(&state_);
-  if (state == STATE_MODIFIED_REPEATED) {
+  // acquire here matches with release below to ensure that we can only see a
+  // value of CLEAN after all previous changes have been synced.
+  if (state_.load(std::memory_order_acquire) == STATE_MODIFIED_REPEATED) {
     mutex_.Lock();
     // Double check state, because another thread may have seen the same state
     // and done the synchronization before the current thread.
-    if (state_ == STATE_MODIFIED_REPEATED) {
+    if (state_.load(std::memory_order_relaxed) == STATE_MODIFIED_REPEATED) {
       SyncMapWithRepeatedFieldNoLock();
-      // "Release" insures state_ can only be changed "after"
-      // SyncRepeatedFieldWithMapNoLock is finished.
-      google::protobuf::internal::Release_Store(&state_, CLEAN);
+      state_.store(CLEAN, std::memory_order_release);
     }
     mutex_.Unlock();
   }
@@ -154,6 +139,7 @@ DynamicMapField::DynamicMapField(const Message* default_entry)
 DynamicMapField::DynamicMapField(const Message* default_entry,
                                  Arena* arena)
     : TypeDefinedMapFieldBase<MapKey, MapValueRef>(arena),
+      map_(arena),
       default_entry_(default_entry) {
 }
 
@@ -390,6 +376,13 @@ void DynamicMapField::SyncMapWithRepeatedFieldNoLock() const {
         GOOGLE_LOG(FATAL) << "Can't get here.";
         break;
     }
+
+    // Remove existing map value with same key.
+    Map<MapKey, MapValueRef>::iterator iter = map->find(map_key);
+    if (iter != map->end()) {
+      iter->second.DeleteData();
+    }
+
     MapValueRef& map_val = (*map)[map_key];
     map_val.SetType(val_des->cpp_type());
     switch (val_des->cpp_type()) {
@@ -421,13 +414,13 @@ void DynamicMapField::SyncMapWithRepeatedFieldNoLock() const {
   }
 }
 
-int DynamicMapField::SpaceUsedExcludingSelfNoLock() const {
-  int size = 0;
+size_t DynamicMapField::SpaceUsedExcludingSelfNoLock() const {
+  size_t size = 0;
   if (MapFieldBase::repeated_field_ != NULL) {
-    size += MapFieldBase::repeated_field_->SpaceUsedExcludingSelf();
+    size += MapFieldBase::repeated_field_->SpaceUsedExcludingSelfLong();
   }
   size += sizeof(map_);
-  int map_size = map_.size();
+  size_t map_size = map_.size();
   if (map_size) {
     Map<MapKey, MapValueRef>::const_iterator it = map_.begin();
     size += sizeof(it->first) * map_size;
@@ -456,7 +449,7 @@ int DynamicMapField::SpaceUsedExcludingSelfNoLock() const {
       case google::protobuf::FieldDescriptor::CPPTYPE_MESSAGE: {
         while (it != map_.end()) {
           const Message& message = it->second.GetMessageValue();
-          size += message.GetReflection()->SpaceUsed(message);
+          size += message.GetReflection()->SpaceUsedLong(message);
           ++it;
         }
         break;
diff --git a/src/google/protobuf/map_field.h b/src/google/protobuf/map_field.h
index d6af8532..494401e1 100644
--- a/src/google/protobuf/map_field.h
+++ b/src/google/protobuf/map_field.h
@@ -31,11 +31,13 @@
 #ifndef GOOGLE_PROTOBUF_MAP_FIELD_H__
 #define GOOGLE_PROTOBUF_MAP_FIELD_H__
 
-#include <google/protobuf/stubs/atomicops.h>
+#include <atomic>
+
 #include <google/protobuf/stubs/mutex.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/arena.h>
+#include <google/protobuf/descriptor.h>
 #include <google/protobuf/map_entry.h>
 #include <google/protobuf/map_field_lite.h>
 #include <google/protobuf/map_type_handler.h>
@@ -62,14 +64,10 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
   MapFieldBase()
       : arena_(NULL),
         repeated_field_(NULL),
-        entry_descriptor_(NULL),
-        assign_descriptor_callback_(NULL),
         state_(STATE_MODIFIED_MAP) {}
   explicit MapFieldBase(Arena* arena)
       : arena_(arena),
         repeated_field_(NULL),
-        entry_descriptor_(NULL),
-        assign_descriptor_callback_(NULL),
         state_(STATE_MODIFIED_MAP) {
     // Mutex's destructor needs to be called explicitly to release resources
     // acquired in its constructor.
@@ -89,6 +87,10 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
   virtual bool ContainsMapKey(const MapKey& map_key) const = 0;
   virtual bool InsertOrLookupMapValue(
       const MapKey& map_key, MapValueRef* val) = 0;
+  // Returns whether changes to the map are reflected in the repeated field.
+  bool IsRepeatedFieldValid() const;
+  // Insures operations after won't get executed before calling this.
+  bool IsMapValid() const;
   virtual bool DeleteMapValue(const MapKey& map_key) = 0;
   virtual bool EqualIterator(const MapIterator& a,
                              const MapIterator& b) const = 0;
@@ -99,11 +101,15 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
 
   // Returns the number of bytes used by the repeated field, excluding
   // sizeof(*this)
-  int SpaceUsedExcludingSelf() const;
+  size_t SpaceUsedExcludingSelfLong() const;
+
+  int SpaceUsedExcludingSelf() const {
+    return internal::ToIntSize(SpaceUsedExcludingSelfLong());
+  }
 
  protected:
   // Gets the size of space used by map field.
-  virtual int SpaceUsedExcludingSelfNoLock() const;
+  virtual size_t SpaceUsedExcludingSelfNoLock() const;
 
   // Synchronizes the content in Map to RepeatedPtrField if there is any change
   // to Map after last synchronization.
@@ -124,9 +130,6 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
   // Provides derived class the access to repeated field.
   void* MutableRepeatedPtrField() const;
 
-  // Creates descriptor for only one time.
-  void InitMetadataOnce() const;
-
   enum State {
     STATE_MODIFIED_MAP = 0,       // map has newly added data that has not been
                                   // synchronized to repeated field
@@ -137,19 +140,10 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
 
   Arena* arena_;
   mutable RepeatedPtrField<Message>* repeated_field_;
-  // MapEntry can only be created from MapField. To create MapEntry, MapField
-  // needs to know its descriptor, because MapEntry is not generated class which
-  // cannot initialize its own descriptor by calling generated
-  // descriptor-assign-function. Thus, we need to register a callback to
-  // initialize MapEntry's descriptor.
-  const Descriptor** entry_descriptor_;
-  void (*assign_descriptor_callback_)();
 
   mutable Mutex mutex_;  // The thread to synchronize map and repeated field
                          // needs to get lock first;
-  mutable volatile Atomic32 state_;  // 0: STATE_MODIFIED_MAP
-                                     // 1: STATE_MODIFIED_REPEATED
-                                     // 2: CLEAN
+  mutable std::atomic<State> state_;
 
  private:
   friend class ContendedMapCleanTest;
@@ -177,6 +171,7 @@ class LIBPROTOBUF_EXPORT MapFieldBase {
   // IncreaseIterator() is called by operator++() of MapIterator only.
   // It implements the ++ operator of MapIterator.
   virtual void IncreaseIterator(MapIterator* map_iter) const = 0;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldBase);
 };
 
 // This class provides common Map Reflection implementations for generated
@@ -206,32 +201,31 @@ class TypeDefinedMapFieldBase : public MapFieldBase {
   void IncreaseIterator(MapIterator* map_iter) const;
 
   virtual void SetMapIteratorValue(MapIterator* map_iter) const = 0;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(TypeDefinedMapFieldBase);
 };
 
 // This class provides access to map field using generated api. It is used for
 // internal generated message implentation only. Users should never use this
 // directly.
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value = 0>
-class MapField : public TypeDefinedMapFieldBase<Key, T>,
-                 public MapFieldLite<Key, T, kKeyFieldType, kValueFieldType,
-                                     default_enum_value> {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value = 0>
+class MapField : public TypeDefinedMapFieldBase<Key, T> {
   // Provide utilities to parse/serialize key/value.  Provide utilities to
   // manipulate internal stored type.
   typedef MapTypeHandler<kKeyFieldType, Key> KeyTypeHandler;
   typedef MapTypeHandler<kValueFieldType, T> ValueTypeHandler;
 
   // Define message type for internal repeated field.
-  typedef MapEntry<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>
-      EntryType;
-  typedef MapEntryLite<Key, T, kKeyFieldType, kValueFieldType,
-                       default_enum_value> EntryLiteType;
+  typedef Derived EntryType;
+  typedef MapEntryLite<Derived, Key, T, kKeyFieldType, kValueFieldType,
+                       default_enum_value>
+      EntryLiteType;
 
   // Define abbreviation for parent MapFieldLite
-  typedef MapFieldLite<Key, T, kKeyFieldType, kValueFieldType,
-                       default_enum_value> MapFieldLiteType;
+  typedef MapFieldLite<Derived, Key, T, kKeyFieldType, kValueFieldType,
+                       default_enum_value>
+      MapFieldLiteType;
 
   // Enum needs to be handled differently from other types because it has
   // different exposed type in google::protobuf::Map's api and repeated field's api. For
@@ -241,58 +235,76 @@ class MapField : public TypeDefinedMapFieldBase<Key, T>,
   typedef typename MapIf<kIsValueEnum, T, const T&>::type CastValueType;
 
  public:
-  MapField();
-  explicit MapField(Arena* arena);
-  // MapField doesn't own the default_entry, which means default_entry must
-  // outlive the lifetime of MapField.
-  MapField(const Message* default_entry);
-  // For tests only.
-  MapField(Arena* arena, const Message* default_entry);
-  ~MapField();
+  typedef typename Derived::SuperType EntryTypeTrait;
+  typedef Map<Key, T> MapType;
+
+  MapField() {}
+  explicit MapField(Arena* arena)
+      : TypeDefinedMapFieldBase<Key, T>(arena), impl_(arena) {}
 
   // Implement MapFieldBase
   bool ContainsMapKey(const MapKey& map_key) const;
   bool InsertOrLookupMapValue(const MapKey& map_key, MapValueRef* val);
   bool DeleteMapValue(const MapKey& map_key);
 
-  // Accessors
-  const Map<Key, T>& GetMap() const;
-  Map<Key, T>* MutableMap();
+  const Map<Key, T>& GetMap() const {
+    MapFieldBase::SyncMapWithRepeatedField();
+    return impl_.GetMap();
+  }
+
+  Map<Key, T>* MutableMap() {
+    MapFieldBase::SyncMapWithRepeatedField();
+    Map<Key, T>* result = impl_.MutableMap();
+    MapFieldBase::SetMapDirty();
+    return result;
+  }
 
   // Convenient methods for generated message implementation.
   int size() const;
   void Clear();
-  void MergeFrom(const MapFieldLiteType& other);
-  void Swap(MapFieldLiteType* other);
-
-  // Allocates metadata only if this MapField is part of a generated message.
-  void SetEntryDescriptor(const Descriptor** descriptor);
-  void SetAssignDescriptorCallback(void (*callback)());
+  void MergeFrom(const MapField& other);
+  void Swap(MapField* other);
+
+  // Used in the implementation of parsing. Caller should take the ownership iff
+  // arena_ is NULL.
+  EntryType* NewEntry() const { return impl_.NewEntry(); }
+  // Used in the implementation of serializing enum value type. Caller should
+  // take the ownership iff arena_ is NULL.
+  EntryType* NewEnumEntryWrapper(const Key& key, const T t) const {
+    return impl_.NewEnumEntryWrapper(key, t);
+  }
+  // Used in the implementation of serializing other value types. Caller should
+  // take the ownership iff arena_ is NULL.
+  EntryType* NewEntryWrapper(const Key& key, const T& t) const {
+    return impl_.NewEntryWrapper(key, t);
+  }
 
  private:
+  MapFieldLiteType impl_;
+
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
 
-  // MapField needs MapEntry's default instance to create new MapEntry.
-  void InitDefaultEntryOnce() const;
-
-  // Manually set default entry instance. For test only.
-  void SetDefaultEntryOnce(const EntryType* default_entry) const;
-
-  // Convenient methods to get internal google::protobuf::Map
-  const Map<Key, T>& GetInternalMap() const;
-  Map<Key, T>* MutableInternalMap();
-
   // Implements MapFieldBase
   void SyncRepeatedFieldWithMapNoLock() const;
   void SyncMapWithRepeatedFieldNoLock() const;
-  int SpaceUsedExcludingSelfNoLock() const;
+  size_t SpaceUsedExcludingSelfNoLock() const;
 
   void SetMapIteratorValue(MapIterator* map_iter) const;
 
-  mutable const EntryType* default_entry_;
-
   friend class ::google::protobuf::Arena;
+  friend class MapFieldStateTest;  // For testing, it needs raw access to impl_
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapField);
+};
+
+template <typename T, typename Key, typename Value,
+          WireFormatLite::FieldType kKeyFieldType,
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+struct MapEntryToMapField<MapEntry<T, Key, Value, kKeyFieldType,
+                                   kValueFieldType, default_enum_value> > {
+  typedef MapField<T, Key, Value, kKeyFieldType, kValueFieldType,
+                   default_enum_value>
+      MapFieldType;
 };
 
 class LIBPROTOBUF_EXPORT DynamicMapField: public TypeDefinedMapFieldBase<MapKey, MapValueRef> {
@@ -318,12 +330,401 @@ class LIBPROTOBUF_EXPORT DynamicMapField: public TypeDefinedMapFieldBase<MapKey,
   // Implements MapFieldBase
   void SyncRepeatedFieldWithMapNoLock() const;
   void SyncMapWithRepeatedFieldNoLock() const;
-  int SpaceUsedExcludingSelfNoLock() const;
+  size_t SpaceUsedExcludingSelfNoLock() const;
   void SetMapIteratorValue(MapIterator* map_iter) const;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(DynamicMapField);
 };
 
 }  // namespace internal
 
+#define TYPE_CHECK(EXPECTEDTYPE, METHOD)                        \
+  if (type() != EXPECTEDTYPE) {                                 \
+    GOOGLE_LOG(FATAL)                                                  \
+        << "Protocol Buffer map usage error:\n"                 \
+        << METHOD << " type does not match\n"                   \
+        << "  Expected : "                                      \
+        << FieldDescriptor::CppTypeName(EXPECTEDTYPE) << "\n"   \
+        << "  Actual   : "                                      \
+        << FieldDescriptor::CppTypeName(type());                \
+  }
+
+// MapKey is an union type for representing any possible
+// map key.
+class LIBPROTOBUF_EXPORT MapKey {
+ public:
+  MapKey() : type_(0) {
+  }
+  MapKey(const MapKey& other) : type_(0) {
+    CopyFrom(other);
+  }
+  MapKey& operator=(const MapKey& other) {
+    CopyFrom(other);
+    return *this;
+  }
+
+  ~MapKey() {
+    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
+      delete val_.string_value_;
+    }
+  }
+
+  FieldDescriptor::CppType type() const {
+    if (type_ == 0) {
+      GOOGLE_LOG(FATAL)
+          << "Protocol Buffer map usage error:\n"
+          << "MapKey::type MapKey is not initialized. "
+          << "Call set methods to initialize MapKey.";
+    }
+    return (FieldDescriptor::CppType)type_;
+  }
+
+  void SetInt64Value(int64 value) {
+    SetType(FieldDescriptor::CPPTYPE_INT64);
+    val_.int64_value_ = value;
+  }
+  void SetUInt64Value(uint64 value) {
+    SetType(FieldDescriptor::CPPTYPE_UINT64);
+    val_.uint64_value_ = value;
+  }
+  void SetInt32Value(int32 value) {
+    SetType(FieldDescriptor::CPPTYPE_INT32);
+    val_.int32_value_ = value;
+  }
+  void SetUInt32Value(uint32 value) {
+    SetType(FieldDescriptor::CPPTYPE_UINT32);
+    val_.uint32_value_ = value;
+  }
+  void SetBoolValue(bool value) {
+    SetType(FieldDescriptor::CPPTYPE_BOOL);
+    val_.bool_value_ = value;
+  }
+  void SetStringValue(const string& val) {
+    SetType(FieldDescriptor::CPPTYPE_STRING);
+    *val_.string_value_ = val;
+  }
+
+  int64 GetInt64Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
+               "MapKey::GetInt64Value");
+    return val_.int64_value_;
+  }
+  uint64 GetUInt64Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
+               "MapKey::GetUInt64Value");
+    return val_.uint64_value_;
+  }
+  int32 GetInt32Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
+               "MapKey::GetInt32Value");
+    return val_.int32_value_;
+  }
+  uint32 GetUInt32Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
+               "MapKey::GetUInt32Value");
+    return val_.uint32_value_;
+  }
+  bool GetBoolValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
+               "MapKey::GetBoolValue");
+    return val_.bool_value_;
+  }
+  const string& GetStringValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
+               "MapKey::GetStringValue");
+    return *val_.string_value_;
+  }
+
+  bool operator<(const MapKey& other) const {
+    if (type_ != other.type_) {
+      // We could define a total order that handles this case, but
+      // there currently no need.  So, for now, fail.
+      GOOGLE_LOG(FATAL) << "Unsupported: type mismatch";
+    }
+    switch (type()) {
+      case FieldDescriptor::CPPTYPE_DOUBLE:
+      case FieldDescriptor::CPPTYPE_FLOAT:
+      case FieldDescriptor::CPPTYPE_ENUM:
+      case FieldDescriptor::CPPTYPE_MESSAGE:
+        GOOGLE_LOG(FATAL) << "Unsupported";
+        return false;
+      case FieldDescriptor::CPPTYPE_STRING:
+        return *val_.string_value_ < *other.val_.string_value_;
+      case FieldDescriptor::CPPTYPE_INT64:
+        return val_.int64_value_ < other.val_.int64_value_;
+      case FieldDescriptor::CPPTYPE_INT32:
+        return val_.int32_value_ < other.val_.int32_value_;
+      case FieldDescriptor::CPPTYPE_UINT64:
+        return val_.uint64_value_ < other.val_.uint64_value_;
+      case FieldDescriptor::CPPTYPE_UINT32:
+        return val_.uint32_value_ < other.val_.uint32_value_;
+      case FieldDescriptor::CPPTYPE_BOOL:
+        return val_.bool_value_ < other.val_.bool_value_;
+    }
+    return false;
+  }
+
+  bool operator==(const MapKey& other) const {
+    if (type_ != other.type_) {
+      // To be consistent with operator<, we don't allow this either.
+      GOOGLE_LOG(FATAL) << "Unsupported: type mismatch";
+    }
+    switch (type()) {
+      case FieldDescriptor::CPPTYPE_DOUBLE:
+      case FieldDescriptor::CPPTYPE_FLOAT:
+      case FieldDescriptor::CPPTYPE_ENUM:
+      case FieldDescriptor::CPPTYPE_MESSAGE:
+        GOOGLE_LOG(FATAL) << "Unsupported";
+        break;
+      case FieldDescriptor::CPPTYPE_STRING:
+        return *val_.string_value_ == *other.val_.string_value_;
+      case FieldDescriptor::CPPTYPE_INT64:
+        return val_.int64_value_ == other.val_.int64_value_;
+      case FieldDescriptor::CPPTYPE_INT32:
+        return val_.int32_value_ == other.val_.int32_value_;
+      case FieldDescriptor::CPPTYPE_UINT64:
+        return val_.uint64_value_ == other.val_.uint64_value_;
+      case FieldDescriptor::CPPTYPE_UINT32:
+        return val_.uint32_value_ == other.val_.uint32_value_;
+      case FieldDescriptor::CPPTYPE_BOOL:
+        return val_.bool_value_ == other.val_.bool_value_;
+    }
+    GOOGLE_LOG(FATAL) << "Can't get here.";
+    return false;
+  }
+
+  void CopyFrom(const MapKey& other) {
+    SetType(other.type());
+    switch (type_) {
+      case FieldDescriptor::CPPTYPE_DOUBLE:
+      case FieldDescriptor::CPPTYPE_FLOAT:
+      case FieldDescriptor::CPPTYPE_ENUM:
+      case FieldDescriptor::CPPTYPE_MESSAGE:
+        GOOGLE_LOG(FATAL) << "Unsupported";
+        break;
+      case FieldDescriptor::CPPTYPE_STRING:
+        *val_.string_value_ = *other.val_.string_value_;
+        break;
+      case FieldDescriptor::CPPTYPE_INT64:
+        val_.int64_value_ = other.val_.int64_value_;
+        break;
+      case FieldDescriptor::CPPTYPE_INT32:
+        val_.int32_value_ = other.val_.int32_value_;
+        break;
+      case FieldDescriptor::CPPTYPE_UINT64:
+        val_.uint64_value_ = other.val_.uint64_value_;
+        break;
+      case FieldDescriptor::CPPTYPE_UINT32:
+        val_.uint32_value_ = other.val_.uint32_value_;
+        break;
+      case FieldDescriptor::CPPTYPE_BOOL:
+        val_.bool_value_ = other.val_.bool_value_;
+        break;
+    }
+  }
+
+ private:
+  template <typename K, typename V>
+  friend class internal::TypeDefinedMapFieldBase;
+  friend class MapIterator;
+  friend class internal::DynamicMapField;
+
+  union KeyValue {
+    KeyValue() {}
+    string* string_value_;
+    int64 int64_value_;
+    int32 int32_value_;
+    uint64 uint64_value_;
+    uint32 uint32_value_;
+    bool bool_value_;
+  } val_;
+
+  void SetType(FieldDescriptor::CppType type) {
+    if (type_ == type) return;
+    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
+      delete val_.string_value_;
+    }
+    type_ = type;
+    if (type_ == FieldDescriptor::CPPTYPE_STRING) {
+      val_.string_value_ = new string;
+    }
+  }
+
+  // type_ is 0 or a valid FieldDescriptor::CppType.
+  int type_;
+};
+
+// MapValueRef points to a map value.
+class LIBPROTOBUF_EXPORT MapValueRef {
+ public:
+  MapValueRef() : data_(NULL), type_(0) {}
+
+  void SetInt64Value(int64 value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
+               "MapValueRef::SetInt64Value");
+    *reinterpret_cast<int64*>(data_) = value;
+  }
+  void SetUInt64Value(uint64 value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
+               "MapValueRef::SetUInt64Value");
+    *reinterpret_cast<uint64*>(data_) = value;
+  }
+  void SetInt32Value(int32 value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
+               "MapValueRef::SetInt32Value");
+    *reinterpret_cast<int32*>(data_) = value;
+  }
+  void SetUInt32Value(uint32 value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
+               "MapValueRef::SetUInt32Value");
+    *reinterpret_cast<uint32*>(data_) = value;
+  }
+  void SetBoolValue(bool value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
+               "MapValueRef::SetBoolValue");
+    *reinterpret_cast<bool*>(data_) = value;
+  }
+  // TODO(jieluo) - Checks that enum is member.
+  void SetEnumValue(int value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_ENUM,
+               "MapValueRef::SetEnumValue");
+    *reinterpret_cast<int*>(data_) = value;
+  }
+  void SetStringValue(const string& value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
+               "MapValueRef::SetStringValue");
+    *reinterpret_cast<string*>(data_) = value;
+  }
+  void SetFloatValue(float value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_FLOAT,
+               "MapValueRef::SetFloatValue");
+    *reinterpret_cast<float*>(data_) = value;
+  }
+  void SetDoubleValue(double value) {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_DOUBLE,
+               "MapValueRef::SetDoubleValue");
+    *reinterpret_cast<double*>(data_) = value;
+  }
+
+  int64 GetInt64Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT64,
+               "MapValueRef::GetInt64Value");
+    return *reinterpret_cast<int64*>(data_);
+  }
+  uint64 GetUInt64Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT64,
+               "MapValueRef::GetUInt64Value");
+    return *reinterpret_cast<uint64*>(data_);
+  }
+  int32 GetInt32Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_INT32,
+               "MapValueRef::GetInt32Value");
+    return *reinterpret_cast<int32*>(data_);
+  }
+  uint32 GetUInt32Value() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_UINT32,
+               "MapValueRef::GetUInt32Value");
+    return *reinterpret_cast<uint32*>(data_);
+  }
+  bool GetBoolValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_BOOL,
+               "MapValueRef::GetBoolValue");
+    return *reinterpret_cast<bool*>(data_);
+  }
+  int GetEnumValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_ENUM,
+               "MapValueRef::GetEnumValue");
+    return *reinterpret_cast<int*>(data_);
+  }
+  const string& GetStringValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_STRING,
+               "MapValueRef::GetStringValue");
+    return *reinterpret_cast<string*>(data_);
+  }
+  float GetFloatValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_FLOAT,
+               "MapValueRef::GetFloatValue");
+    return *reinterpret_cast<float*>(data_);
+  }
+  double GetDoubleValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_DOUBLE,
+               "MapValueRef::GetDoubleValue");
+    return *reinterpret_cast<double*>(data_);
+  }
+
+  const Message& GetMessageValue() const {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_MESSAGE,
+               "MapValueRef::GetMessageValue");
+    return *reinterpret_cast<Message*>(data_);
+  }
+
+  Message* MutableMessageValue() {
+    TYPE_CHECK(FieldDescriptor::CPPTYPE_MESSAGE,
+               "MapValueRef::MutableMessageValue");
+    return reinterpret_cast<Message*>(data_);
+  }
+
+ private:
+  template <typename Derived, typename K, typename V,
+            internal::WireFormatLite::FieldType key_wire_type,
+            internal::WireFormatLite::FieldType value_wire_type,
+            int default_enum_value>
+  friend class internal::MapField;
+  template <typename K, typename V>
+  friend class internal::TypeDefinedMapFieldBase;
+  friend class MapIterator;
+  friend class internal::GeneratedMessageReflection;
+  friend class internal::DynamicMapField;
+
+  void SetType(FieldDescriptor::CppType type) {
+    type_ = type;
+  }
+
+  FieldDescriptor::CppType type() const {
+    if (type_ == 0 || data_ == NULL) {
+      GOOGLE_LOG(FATAL)
+          << "Protocol Buffer map usage error:\n"
+          << "MapValueRef::type MapValueRef is not initialized.";
+    }
+    return (FieldDescriptor::CppType)type_;
+  }
+  void SetValue(const void* val) {
+    data_ = const_cast<void*>(val);
+  }
+  void CopyFrom(const MapValueRef& other) {
+    type_ = other.type_;
+    data_ = other.data_;
+  }
+  // Only used in DynamicMapField
+  void DeleteData() {
+    switch (type_) {
+#define HANDLE_TYPE(CPPTYPE, TYPE)                              \
+      case google::protobuf::FieldDescriptor::CPPTYPE_##CPPTYPE: {        \
+        delete reinterpret_cast<TYPE*>(data_);                  \
+        break;                                                  \
+      }
+      HANDLE_TYPE(INT32, int32);
+      HANDLE_TYPE(INT64, int64);
+      HANDLE_TYPE(UINT32, uint32);
+      HANDLE_TYPE(UINT64, uint64);
+      HANDLE_TYPE(DOUBLE, double);
+      HANDLE_TYPE(FLOAT, float);
+      HANDLE_TYPE(BOOL, bool);
+      HANDLE_TYPE(STRING, string);
+      HANDLE_TYPE(ENUM, int32);
+      HANDLE_TYPE(MESSAGE, Message);
+#undef HANDLE_TYPE
+    }
+  }
+  // data_ point to a map value. MapValueRef does not
+  // own this value.
+  void* data_;
+  // type_ is 0 or a valid FieldDescriptor::CppType.
+  int type_;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapValueRef);
+};
+
+#undef TYPE_CHECK
+
 class LIBPROTOBUF_EXPORT MapIterator {
  public:
   MapIterator(Message* message, const FieldDescriptor* field) {
@@ -341,6 +742,11 @@ class LIBPROTOBUF_EXPORT MapIterator {
   ~MapIterator() {
     map_->DeleteIterator(this);
   }
+  MapIterator& operator=(const MapIterator& other) {
+    map_ = other.map_;
+    map_->CopyIterator(this, other);
+    return *this;
+  }
   friend bool operator==(const MapIterator& a, const MapIterator& b) {
     return a.map_->EqualIterator(a, b);
   }
@@ -373,7 +779,7 @@ class LIBPROTOBUF_EXPORT MapIterator {
   template <typename Key, typename T>
   friend class internal::TypeDefinedMapFieldBase;
   friend class internal::DynamicMapField;
-  template <typename Key, typename T,
+  template <typename Derived, typename Key, typename T,
             internal::WireFormatLite::FieldType kKeyFieldType,
             internal::WireFormatLite::FieldType kValueFieldType,
             int default_enum_value>
@@ -392,6 +798,42 @@ class LIBPROTOBUF_EXPORT MapIterator {
 };
 
 }  // namespace protobuf
-
 }  // namespace google
+
+GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_START
+template<>
+struct hash<google::protobuf::MapKey> {
+  size_t
+  operator()(const google::protobuf::MapKey& map_key) const {
+    switch (map_key.type()) {
+      case google::protobuf::FieldDescriptor::CPPTYPE_DOUBLE:
+      case google::protobuf::FieldDescriptor::CPPTYPE_FLOAT:
+      case google::protobuf::FieldDescriptor::CPPTYPE_ENUM:
+      case google::protobuf::FieldDescriptor::CPPTYPE_MESSAGE:
+        GOOGLE_LOG(FATAL) << "Unsupported";
+        break;
+      case google::protobuf::FieldDescriptor::CPPTYPE_STRING:
+        return hash<string>()(map_key.GetStringValue());
+      case google::protobuf::FieldDescriptor::CPPTYPE_INT64:
+        return hash<::google::protobuf::int64>()(map_key.GetInt64Value());
+      case google::protobuf::FieldDescriptor::CPPTYPE_INT32:
+        return hash<::google::protobuf::int32>()(map_key.GetInt32Value());
+      case google::protobuf::FieldDescriptor::CPPTYPE_UINT64:
+        return hash<::google::protobuf::uint64>()(map_key.GetUInt64Value());
+      case google::protobuf::FieldDescriptor::CPPTYPE_UINT32:
+        return hash<::google::protobuf::uint32>()(map_key.GetUInt32Value());
+      case google::protobuf::FieldDescriptor::CPPTYPE_BOOL:
+        return hash<bool>()(map_key.GetBoolValue());
+    }
+    GOOGLE_LOG(FATAL) << "Can't get here.";
+    return 0;
+  }
+  bool
+  operator()(const google::protobuf::MapKey& map_key1,
+             const google::protobuf::MapKey& map_key2) const {
+    return map_key1 < map_key2;
+  }
+};
+GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_END
+
 #endif  // GOOGLE_PROTOBUF_MAP_FIELD_H__
diff --git a/src/google/protobuf/map_field_inl.h b/src/google/protobuf/map_field_inl.h
index 2d84b0a3..d0517792 100644
--- a/src/google/protobuf/map_field_inl.h
+++ b/src/google/protobuf/map_field_inl.h
@@ -32,10 +32,8 @@
 #define GOOGLE_PROTOBUF_MAP_FIELD_INL_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
+#include <google/protobuf/stubs/casts.h>
 #include <google/protobuf/map.h>
 #include <google/protobuf/map_field.h>
 #include <google/protobuf/map_type_handler.h>
@@ -162,81 +160,32 @@ void TypeDefinedMapFieldBase<Key, T>::CopyIterator(
 
 // ----------------------------------------------------------------------
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-MapField<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>::MapField()
-    : default_entry_(NULL) {}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-MapField<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>::MapField(
-    Arena* arena)
-    : TypeDefinedMapFieldBase<Key, T>(arena),
-      MapFieldLite<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>(
-          arena),
-      default_entry_(NULL) {}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-MapField<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>::MapField(
-    const Message* default_entry)
-    : default_entry_(down_cast<const EntryType*>(default_entry)) {}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-MapField<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>::MapField(
-    Arena* arena, const Message* default_entry)
-    : TypeDefinedMapFieldBase<Key, T>(arena),
-      MapFieldLite<Key, T, kKeyFieldType, kValueFieldType, default_enum_value>(
-          arena),
-      default_entry_(down_cast<const EntryType*>(default_entry)) {}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::~MapField() {}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-int
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::size() const {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+int MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+             default_enum_value>::size() const {
   MapFieldBase::SyncMapWithRepeatedField();
-  return MapFieldLiteType::GetInternalMap().size();
+  return static_cast<int>(impl_.GetMap().size());
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::Clear() {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::Clear() {
   MapFieldBase::SyncMapWithRepeatedField();
-  MapFieldLiteType::MutableInternalMap()->clear();
+  impl_.MutableMap()->clear();
   MapFieldBase::SetMapDirty();
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void MapField<Key, T, kKeyFieldType, kValueFieldType,
-              default_enum_value>::SetMapIteratorValue(
-                  MapIterator* map_iter) const {
-  const Map<Key, T>& map = GetMap();
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::SetMapIteratorValue(MapIterator* map_iter)
+    const {
+  const Map<Key, T>& map = impl_.GetMap();
   typename Map<Key, T>::const_iterator iter =
       TypeDefinedMapFieldBase<Key, T>::InternalGetIterator(map_iter);
   if (iter == map.end()) return;
@@ -244,27 +193,23 @@ void MapField<Key, T, kKeyFieldType, kValueFieldType,
   map_iter->value_.SetValue(&iter->second);
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-bool MapField<Key, T, kKeyFieldType, kValueFieldType,
-              default_enum_value>::ContainsMapKey(
-                  const MapKey& map_key) const {
-  const Map<Key, T>& map = GetMap();
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+bool MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::ContainsMapKey(const MapKey& map_key) const {
+  const Map<Key, T>& map = impl_.GetMap();
   const Key& key = UnwrapMapKey<Key>(map_key);
   typename Map<Key, T>::const_iterator iter = map.find(key);
   return iter != map.end();
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-bool MapField<Key, T, kKeyFieldType, kValueFieldType,
-              default_enum_value>::InsertOrLookupMapValue(
-                  const MapKey& map_key,
-                  MapValueRef* val) {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+bool MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::InsertOrLookupMapValue(const MapKey& map_key,
+                                                          MapValueRef* val) {
   // Always use mutable map because users may change the map value by
   // MapValueRef.
   Map<Key, T>* map = MutableMap();
@@ -280,118 +225,45 @@ bool MapField<Key, T, kKeyFieldType, kValueFieldType,
   return false;
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-bool MapField<Key, T, kKeyFieldType, kValueFieldType,
-              default_enum_value>::DeleteMapValue(
-                  const MapKey& map_key) {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+bool MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::DeleteMapValue(const MapKey& map_key) {
   const Key& key = UnwrapMapKey<Key>(map_key);
   return MutableMap()->erase(key);
 }
 
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-const Map<Key, T>&
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::GetMap() const {
-  MapFieldBase::SyncMapWithRepeatedField();
-  return MapFieldLiteType::GetInternalMap();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-Map<Key, T>*
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::MutableMap() {
-  MapFieldBase::SyncMapWithRepeatedField();
-  Map<Key, T>* result = MapFieldLiteType::MutableInternalMap();
-  MapFieldBase::SetMapDirty();
-  return result;
-}
-
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::MergeFrom(
-    const MapFieldLiteType& other) {
-  const MapField& down_other = down_cast<const MapField&>(other);
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::MergeFrom(const MapField& other) {
   MapFieldBase::SyncMapWithRepeatedField();
-  down_other.SyncMapWithRepeatedField();
-  MapFieldLiteType::MergeFrom(other);
+  other.SyncMapWithRepeatedField();
+  impl_.MergeFrom(other.impl_);
   MapFieldBase::SetMapDirty();
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::Swap(
-    MapFieldLiteType* other) {
-  MapField* down_other = down_cast<MapField*>(other);
-  std::swap(this->MapFieldBase::repeated_field_, down_other->repeated_field_);
-  MapFieldLiteType::Swap(other);
-  std::swap(this->MapFieldBase::state_, down_other->state_);
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::SetEntryDescriptor(
-    const Descriptor** descriptor) {
-  this->MapFieldBase::entry_descriptor_ = descriptor;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::SetAssignDescriptorCallback(void (*callback)()) {
-  this->MapFieldBase::assign_descriptor_callback_ = callback;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-const Map<Key, T>&
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::GetInternalMap() const {
-  return MapFieldLiteType::GetInternalMap();
-}
-
-template <typename Key, typename T,
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::Swap(MapField* other) {
+  std::swap(this->MapFieldBase::repeated_field_, other->repeated_field_);
+  impl_.Swap(&other->impl_);
+  // a relaxed swap of the atomic
+  auto other_state = other->state_.load(std::memory_order_relaxed);
+  auto this_state = this->MapFieldBase::state_.load(std::memory_order_relaxed);
+  other->state_.store(this_state, std::memory_order_relaxed);
+  this->MapFieldBase::state_.store(other_state, std::memory_order_relaxed);
+}
+
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-Map<Key, T>*
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::MutableInternalMap() {
-  return MapFieldLiteType::MutableInternalMap();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::SyncRepeatedFieldWithMapNoLock() const {
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::SyncRepeatedFieldWithMapNoLock() const {
   if (this->MapFieldBase::repeated_field_ == NULL) {
     if (this->MapFieldBase::arena_ == NULL) {
       this->MapFieldBase::repeated_field_ = new RepeatedPtrField<Message>();
@@ -401,33 +273,35 @@ MapField<Key, T, kKeyFieldType, kValueFieldType,
               this->MapFieldBase::arena_);
     }
   }
-  const Map<Key, T>& map = GetInternalMap();
+  const Map<Key, T>& map = impl_.GetMap();
   RepeatedPtrField<EntryType>* repeated_field =
       reinterpret_cast<RepeatedPtrField<EntryType>*>(
           this->MapFieldBase::repeated_field_);
 
   repeated_field->Clear();
 
+  // The only way we can get at this point is through reflection and the
+  // only way we can get the reflection object is by having called GetReflection
+  // on the encompassing field. So that type must have existed and hence we
+  // know that this MapEntry default_type has also already been constructed.
+  // So it's safe to just call internal_default_instance().
+  const Message* default_entry = Derived::internal_default_instance();
   for (typename Map<Key, T>::const_iterator it = map.begin();
        it != map.end(); ++it) {
-    InitDefaultEntryOnce();
-    GOOGLE_CHECK(default_entry_ != NULL);
     EntryType* new_entry =
-        down_cast<EntryType*>(default_entry_->New(this->MapFieldBase::arena_));
+        down_cast<EntryType*>(default_entry->New(this->MapFieldBase::arena_));
     repeated_field->AddAllocated(new_entry);
     (*new_entry->mutable_key()) = it->first;
     (*new_entry->mutable_value()) = it->second;
   }
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::SyncMapWithRepeatedFieldNoLock() const {
-  Map<Key, T>* map = const_cast<MapField*>(this)->MutableInternalMap();
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+void MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+              default_enum_value>::SyncMapWithRepeatedFieldNoLock() const {
+  Map<Key, T>* map = const_cast<MapField*>(this)->impl_.MutableMap();
   RepeatedPtrField<EntryType>* repeated_field =
       reinterpret_cast<RepeatedPtrField<EntryType>*>(
           this->MapFieldBase::repeated_field_);
@@ -444,44 +318,24 @@ MapField<Key, T, kKeyFieldType, kValueFieldType,
   }
 }
 
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-int
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::SpaceUsedExcludingSelfNoLock() const {
-  int size = 0;
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+size_t MapField<Derived, Key, T, kKeyFieldType, kValueFieldType,
+                default_enum_value>::SpaceUsedExcludingSelfNoLock() const {
+  size_t size = 0;
   if (this->MapFieldBase::repeated_field_ != NULL) {
-    size += this->MapFieldBase::repeated_field_->SpaceUsedExcludingSelf();
+    size += this->MapFieldBase::repeated_field_->SpaceUsedExcludingSelfLong();
   }
-  Map<Key, T>* map = const_cast<MapField*>(this)->MutableInternalMap();
+  Map<Key, T>* map = const_cast<MapField*>(this)->impl_.MutableMap();
   size += sizeof(*map);
-  for (typename Map<Key, T>::iterator it = map->begin();
-       it != map->end(); ++it) {
-    size += KeyTypeHandler::SpaceUsedInMap(it->first);
-    size += ValueTypeHandler::SpaceUsedInMap(it->second);
+  for (typename Map<Key, T>::iterator it = map->begin(); it != map->end();
+       ++it) {
+    size += KeyTypeHandler::SpaceUsedInMapLong(it->first);
+    size += ValueTypeHandler::SpaceUsedInMapLong(it->second);
   }
   return size;
 }
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType kKeyFieldType,
-          WireFormatLite::FieldType kValueFieldType,
-          int default_enum_value>
-void
-MapField<Key, T, kKeyFieldType, kValueFieldType,
-         default_enum_value>::InitDefaultEntryOnce()
-    const {
-  if (default_entry_ == NULL) {
-    MapFieldBase::InitMetadataOnce();
-    GOOGLE_CHECK(*this->MapFieldBase::entry_descriptor_ != NULL);
-    default_entry_ = down_cast<const EntryType*>(
-        MessageFactory::generated_factory()->GetPrototype(
-            *this->MapFieldBase::entry_descriptor_));
-  }
-}
-
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/map_field_lite.h b/src/google/protobuf/map_field_lite.h
index cb0a4a45..f648b430 100644
--- a/src/google/protobuf/map_field_lite.h
+++ b/src/google/protobuf/map_field_lite.h
@@ -33,6 +33,7 @@
 
 #include <google/protobuf/map.h>
 #include <google/protobuf/map_entry_lite.h>
+#include <google/protobuf/wire_format_lite.h>
 
 namespace google {
 namespace protobuf {
@@ -41,224 +42,72 @@ namespace internal {
 // This class provides access to map field using generated api. It is used for
 // internal generated message implentation only. Users should never use this
 // directly.
-template <typename Key, typename T,
+template <typename Derived, typename Key, typename T,
           WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value = 0>
+          WireFormatLite::FieldType value_wire_type, int default_enum_value = 0>
 class MapFieldLite {
   // Define message type for internal repeated field.
-  typedef MapEntryLite<Key, T, key_wire_type, value_wire_type,
-                       default_enum_value> EntryType;
+  typedef Derived EntryType;
 
  public:
-  MapFieldLite();
-  explicit MapFieldLite(Arena* arena);
-  virtual ~MapFieldLite();
+  typedef Map<Key, T> MapType;
+  typedef EntryType EntryTypeTrait;
+
+  MapFieldLite() : arena_(NULL) { SetDefaultEnumValue(); }
+
+  explicit MapFieldLite(Arena* arena) : arena_(arena), map_(arena) {
+    SetDefaultEnumValue();
+  }
 
   // Accessors
-  virtual const Map<Key, T>& GetMap() const;
-  virtual Map<Key, T>* MutableMap();
+  const Map<Key, T>& GetMap() const { return map_; }
+  Map<Key, T>* MutableMap() { return &map_; }
 
   // Convenient methods for generated message implementation.
-  virtual int size() const;
-  virtual void Clear();
-  virtual void MergeFrom(const MapFieldLite& other);
-  virtual void Swap(MapFieldLite* other);
+  int size() const { return static_cast<int>(map_.size()); }
+  void Clear() { return map_.clear(); }
+  void MergeFrom(const MapFieldLite& other) {
+    for (typename Map<Key, T>::const_iterator it = other.map_.begin();
+         it != other.map_.end(); ++it) {
+      map_[it->first] = it->second;
+    }
+  }
+  void Swap(MapFieldLite* other) { map_.swap(other->map_); }
 
   // Set default enum value only for proto2 map field whose value is enum type.
-  void SetDefaultEnumValue();
+  void SetDefaultEnumValue() {
+    MutableMap()->SetDefaultEnumValue(default_enum_value);
+  }
 
   // Used in the implementation of parsing. Caller should take the ownership iff
   // arena_ is NULL.
-  EntryType* NewEntry() const;
+  EntryType* NewEntry() const {
+    if (arena_ == NULL) {
+      return new EntryType();
+    } else {
+      return Arena::CreateMessage<EntryType>(arena_);
+    }
+  }
   // Used in the implementation of serializing enum value type. Caller should
   // take the ownership iff arena_ is NULL.
-  EntryType* NewEnumEntryWrapper(const Key& key, const T t) const;
+  EntryType* NewEnumEntryWrapper(const Key& key, const T t) const {
+    return EntryType::EnumWrap(key, t, arena_);
+  }
   // Used in the implementation of serializing other value types. Caller should
   // take the ownership iff arena_ is NULL.
-  EntryType* NewEntryWrapper(const Key& key, const T& t) const;
-
- protected:
-  // Convenient methods to get internal google::protobuf::Map
-  virtual const Map<Key, T>& GetInternalMap() const;
-  virtual Map<Key, T>* MutableInternalMap();
+  EntryType* NewEntryWrapper(const Key& key, const T& t) const {
+    return EntryType::Wrap(key, t, arena_);
+  }
 
  private:
   typedef void DestructorSkippable_;
 
   Arena* arena_;
-  Map<Key, T>* map_;
+  Map<Key, T> map_;
 
   friend class ::google::protobuf::Arena;
 };
 
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::MapFieldLite()
-    : arena_(NULL) {
-  map_ = new Map<Key, T>;
-  SetDefaultEnumValue();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::MapFieldLite(Arena* arena)
-  : arena_(arena) {
-  map_ = Arena::CreateMessage<Map<Key, T> >(arena);
-  SetDefaultEnumValue();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::~MapFieldLite() {
-  delete map_;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-const Map<Key, T>&
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::GetMap() const {
-  return *map_;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-Map<Key, T>*
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::MutableMap() {
-  return map_;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-int
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::size() const {
-  return map_->size();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-void
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::Clear() {
-  map_->clear();
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-void
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::MergeFrom(
-    const MapFieldLite& other) {
-  for (typename Map<Key, T>::const_iterator it = other.map_->begin();
-       it != other.map_->end(); ++it) {
-    (*map_)[it->first] = it->second;
-  }
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-void
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::Swap(
-    MapFieldLite* other) {
-  std::swap(map_, other->map_);
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-void
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::SetDefaultEnumValue() {
-  MutableInternalMap()->SetDefaultEnumValue(default_enum_value);
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-const Map<Key, T>&
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::GetInternalMap() const {
-  return *map_;
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-Map<Key, T>*
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::MutableInternalMap() {
-  return map_;
-}
-
-#define EntryType \
-  MapEntryLite<Key, T, key_wire_type, value_wire_type, default_enum_value>
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-EntryType*
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::NewEntry() const {
-  if (arena_ == NULL) {
-    return new EntryType();
-  } else {
-    return Arena::CreateMessage<EntryType>(arena_);
-  }
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-EntryType*
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::NewEnumEntryWrapper(const Key& key,
-                                                      const T t) const {
-  return EntryType::EnumWrap(key, t, arena_);
-}
-
-template <typename Key, typename T,
-          WireFormatLite::FieldType key_wire_type,
-          WireFormatLite::FieldType value_wire_type,
-          int default_enum_value>
-EntryType*
-MapFieldLite<Key, T, key_wire_type, value_wire_type,
-             default_enum_value>::NewEntryWrapper(const Key& key,
-                                                  const T& t) const {
-  return EntryType::Wrap(key, t, arena_);
-}
-
-#undef EntryType
-
 // True if IsInitialized() is true for value field in all elements of t. T is
 // expected to be message.  It's useful to have this helper here to keep the
 // protobuf compiler from ever having to emit loops in IsInitialized() methods.
@@ -272,6 +121,21 @@ bool AllAreInitialized(const Map<Key, T>& t) {
   return true;
 }
 
+template <typename MEntry>
+struct MapEntryToMapField : MapEntryToMapField<typename MEntry::SuperType> {};
+
+template <typename T, typename Key, typename Value,
+          WireFormatLite::FieldType kKeyFieldType,
+          WireFormatLite::FieldType kValueFieldType, int default_enum_value>
+struct MapEntryToMapField<MapEntryLite<T, Key, Value, kKeyFieldType,
+                                       kValueFieldType, default_enum_value> > {
+  typedef MapFieldLite<MapEntryLite<T, Key, Value, kKeyFieldType,
+                                    kValueFieldType, default_enum_value>,
+                       Key, Value, kKeyFieldType, kValueFieldType,
+                       default_enum_value>
+      MapFieldType;
+};
+
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/map_field_test.cc b/src/google/protobuf/map_field_test.cc
index dd5061c4..f58d59e5 100644
--- a/src/google/protobuf/map_field_test.cc
+++ b/src/google/protobuf/map_field_test.cc
@@ -30,9 +30,6 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -71,10 +68,18 @@ class MapFieldBaseStub : public MapFieldBase {
   RepeatedPtrField<Message>* InternalRepeatedField() {
     return repeated_field_;
   }
-  bool IsMapClean() { return state_ != 0; }
-  bool IsRepeatedClean() { return state_ != 1; }
-  void SetMapDirty() { state_ = 0; }
-  void SetRepeatedDirty() { state_ = 1; }
+  bool IsMapClean() {
+    return state_.load(std::memory_order_relaxed) != STATE_MODIFIED_MAP;
+  }
+  bool IsRepeatedClean() {
+    return state_.load(std::memory_order_relaxed) != STATE_MODIFIED_REPEATED;
+  }
+  void SetMapDirty() {
+    state_.store(STATE_MODIFIED_MAP, std::memory_order_relaxed);
+  }
+  void SetRepeatedDirty() {
+    state_.store(STATE_MODIFIED_REPEATED, std::memory_order_relaxed);
+  }
   bool ContainsMapKey(const MapKey& map_key) const {
     return false;
   }
@@ -101,8 +106,10 @@ class MapFieldBaseStub : public MapFieldBase {
 
 class MapFieldBasePrimitiveTest : public ::testing::Test {
  protected:
-  typedef MapField<int32, int32, WireFormatLite::TYPE_INT32,
-                   WireFormatLite::TYPE_INT32, false> MapFieldType;
+  typedef unittest::TestMap_MapInt32Int32Entry_DoNotUse EntryType;
+  typedef MapField<EntryType, int32, int32, WireFormatLite::TYPE_INT32,
+                   WireFormatLite::TYPE_INT32, false>
+      MapFieldType;
 
   MapFieldBasePrimitiveTest() {
     // Get descriptors
@@ -113,9 +120,7 @@ class MapFieldBasePrimitiveTest : public ::testing::Test {
     value_descriptor_ = map_descriptor_->FindFieldByName("value");
 
     // Build map field
-    default_entry_ =
-        MessageFactory::generated_factory()->GetPrototype(map_descriptor_);
-    map_field_.reset(new MapFieldType(default_entry_));
+    map_field_.reset(new MapFieldType);
     map_field_base_ = map_field_.get();
     map_ = map_field_->MutableMap();
     initial_value_map_[0] = 100;
@@ -124,13 +129,12 @@ class MapFieldBasePrimitiveTest : public ::testing::Test {
     EXPECT_EQ(2, map_->size());
   }
 
-  google::protobuf::scoped_ptr<MapFieldType> map_field_;
+  std::unique_ptr<MapFieldType> map_field_;
   MapFieldBase* map_field_base_;
   Map<int32, int32>* map_;
   const Descriptor* map_descriptor_;
   const FieldDescriptor* key_descriptor_;
   const FieldDescriptor* value_descriptor_;
-  const Message* default_entry_;
   std::map<int32, int32> initial_value_map_;  // copy of initial values inserted
 };
 
@@ -177,8 +181,7 @@ TEST_F(MapFieldBasePrimitiveTest, Arena) {
     // repeated fields are allocated from arenas.
     // NoHeapChecker no_heap;
 
-    MapFieldType* map_field =
-        Arena::CreateMessage<MapFieldType>(&arena, default_entry_);
+    MapFieldType* map_field = Arena::CreateMessage<MapFieldType>(&arena);
 
     // Set content in map
     (*map_field->MutableMap())[100] = 101;
@@ -208,19 +211,13 @@ class MapFieldStateTest
     : public testing::TestWithParam<State> {
  public:
  protected:
-  typedef MapField<int32, int32, WireFormatLite::TYPE_INT32,
-                   WireFormatLite::TYPE_INT32, false> MapFieldType;
-  typedef MapFieldLite<int32, int32, WireFormatLite::TYPE_INT32,
-                       WireFormatLite::TYPE_INT32, false> MapFieldLiteType;
+  typedef unittest::TestMap_MapInt32Int32Entry_DoNotUse EntryType;
+  typedef MapField<EntryType, int32, int32, WireFormatLite::TYPE_INT32,
+                   WireFormatLite::TYPE_INT32, false>
+      MapFieldType;
   MapFieldStateTest() : state_(GetParam()) {
     // Build map field
-    const Descriptor* map_descriptor =
-        unittest::TestMap::descriptor()
-            ->FindFieldByName("map_int32_int32")
-            ->message_type();
-    default_entry_ =
-        MessageFactory::generated_factory()->GetPrototype(map_descriptor);
-    map_field_.reset(new MapFieldType(default_entry_));
+    map_field_.reset(new MapFieldType());
     map_field_base_ = map_field_.get();
 
     Expect(map_field_.get(), MAP_DIRTY, 0, 0, true);
@@ -257,8 +254,8 @@ class MapFieldStateTest
     MakeMapDirty(map_field);
     MapFieldBase* map_field_base = map_field;
     map_field_base->MutableRepeatedField();
-    Map<int32, int32>* map = implicit_cast<MapFieldLiteType*>(map_field)
-                                 ->MapFieldLiteType::MutableMap();
+    // We use MutableMap on impl_ because we don't want to disturb the syncing
+    Map<int32, int32>* map = map_field->impl_.MutableMap();
     map->clear();
 
     Expect(map_field, REPEATED_DIRTY, 0, 1, false);
@@ -270,8 +267,8 @@ class MapFieldStateTest
     MapFieldBaseStub* stub =
         reinterpret_cast<MapFieldBaseStub*>(map_field_base);
 
-    Map<int32, int32>* map = implicit_cast<MapFieldLiteType*>(map_field)
-                                 ->MapFieldLiteType::MutableMap();
+    // We use MutableMap on impl_ because we don't want to disturb the syncing
+    Map<int32, int32>* map = map_field->impl_.MutableMap();
     RepeatedPtrField<Message>* repeated_field = stub->InternalRepeatedField();
 
     switch (state) {
@@ -299,10 +296,9 @@ class MapFieldStateTest
     }
   }
 
-  google::protobuf::scoped_ptr<MapFieldType> map_field_;
+  std::unique_ptr<MapFieldType> map_field_;
   MapFieldBase* map_field_base_;
   State state_;
-  const Message* default_entry_;
 };
 
 INSTANTIATE_TEST_CASE_P(MapFieldStateTestInstance, MapFieldStateTest,
@@ -327,7 +323,7 @@ TEST_P(MapFieldStateTest, MutableMap) {
 }
 
 TEST_P(MapFieldStateTest, MergeFromClean) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   AddOneStillClean(&other);
 
   map_field_->MergeFrom(other);
@@ -342,7 +338,7 @@ TEST_P(MapFieldStateTest, MergeFromClean) {
 }
 
 TEST_P(MapFieldStateTest, MergeFromMapDirty) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   MakeMapDirty(&other);
 
   map_field_->MergeFrom(other);
@@ -357,7 +353,7 @@ TEST_P(MapFieldStateTest, MergeFromMapDirty) {
 }
 
 TEST_P(MapFieldStateTest, MergeFromRepeatedDirty) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   MakeRepeatedDirty(&other);
 
   map_field_->MergeFrom(other);
@@ -372,7 +368,7 @@ TEST_P(MapFieldStateTest, MergeFromRepeatedDirty) {
 }
 
 TEST_P(MapFieldStateTest, SwapClean) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   AddOneStillClean(&other);
 
   map_field_->Swap(&other);
@@ -395,7 +391,7 @@ TEST_P(MapFieldStateTest, SwapClean) {
 }
 
 TEST_P(MapFieldStateTest, SwapMapDirty) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   MakeMapDirty(&other);
 
   map_field_->Swap(&other);
@@ -418,7 +414,7 @@ TEST_P(MapFieldStateTest, SwapMapDirty) {
 }
 
 TEST_P(MapFieldStateTest, SwapRepeatedDirty) {
-  MapFieldType other(default_entry_);
+  MapFieldType other;
   MakeRepeatedDirty(&other);
 
   map_field_->Swap(&other);
diff --git a/src/google/protobuf/map_proto2_unittest.proto b/src/google/protobuf/map_proto2_unittest.proto
index e9360a5a..20d58f90 100644
--- a/src/google/protobuf/map_proto2_unittest.proto
+++ b/src/google/protobuf/map_proto2_unittest.proto
@@ -84,3 +84,8 @@ message TestMaps {
   map<bool, TestIntIntMap> m_bool = 11;
   map<string, TestIntIntMap> m_string = 12;
 }
+
+// Test maps in submessages.
+message TestSubmessageMaps {
+  optional TestMaps m = 1;
+}
diff --git a/src/google/protobuf/map_test.cc b/src/google/protobuf/map_test.cc
index 43fe0f44..829a60ff 100644
--- a/src/google/protobuf/map_test.cc
+++ b/src/google/protobuf/map_test.cc
@@ -40,9 +40,6 @@
 #include <google/protobuf/stubs/hash.h>
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <set>
 #include <sstream>
 #include <vector>
@@ -54,10 +51,13 @@
 #include <google/protobuf/testing/file.h>
 #include <google/protobuf/arena_test_util.h>
 #include <google/protobuf/map_proto2_unittest.pb.h>
-#include <google/protobuf/map_unittest.pb.h>
 #include <google/protobuf/map_test_util.h>
+#include <google/protobuf/map_unittest.pb.h>
 #include <google/protobuf/test_util.h>
 #include <google/protobuf/unittest.pb.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/tokenizer.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/descriptor_database.h>
@@ -70,12 +70,8 @@
 #include <google/protobuf/text_format.h>
 #include <google/protobuf/wire_format.h>
 #include <google/protobuf/wire_format_lite_inl.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/tokenizer.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/util/time_util.h>
 #include <google/protobuf/util/message_differencer.h>
-#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/util/time_util.h>
 #include <google/protobuf/stubs/substitute.h>
 #include <gmock/gmock.h>
 #include <google/protobuf/testing/googletest.h>
@@ -97,17 +93,15 @@ void MapTestForceDeterministic() {
 
 // Map API Test =====================================================
 
-// Parameterized tests on whether to use old style maps.
-class MapImplTest : public testing::TestWithParam<bool> {
+class MapImplTest : public ::testing::Test {
  protected:
   MapImplTest()
-      : map_ptr_(new Map<int32, int32>(GetParam())),
+      : map_ptr_(new Map<int32, int32>()),
         map_(*map_ptr_),
         const_map_(*map_ptr_) {
     EXPECT_TRUE(map_.empty());
     EXPECT_EQ(0, map_.size());
   }
-  ~MapImplTest() {}
 
   void ExpectSingleElement(int32 key, int32 value) {
     EXPECT_FALSE(map_.empty());
@@ -133,7 +127,7 @@ class MapImplTest : public testing::TestWithParam<bool> {
     EXPECT_EQ(value, map_.at(key));
     Map<int32, int32>::iterator it = map_.find(key);
 
-    // interator dereferenceable
+    // iterator dereferenceable
     EXPECT_EQ(key,   (*it).first);
     EXPECT_EQ(value, (*it).second);
     EXPECT_EQ(key,   it->first);
@@ -161,7 +155,7 @@ class MapImplTest : public testing::TestWithParam<bool> {
     EXPECT_EQ(value, const_map_.at(key));
     Map<int32, int32>::const_iterator const_it = const_map_.find(key);
 
-    // interator dereferenceable
+    // iterator dereferenceable
     EXPECT_EQ(key, (*const_it).first);
     EXPECT_EQ(value, (*const_it).second);
     EXPECT_EQ(key, const_it->first);
@@ -173,12 +167,12 @@ class MapImplTest : public testing::TestWithParam<bool> {
     EXPECT_EQ(value, const_it_copy->second);
   }
 
-  google::protobuf::scoped_ptr<Map<int32, int32> > map_ptr_;
+  std::unique_ptr<Map<int32, int32> > map_ptr_;
   Map<int32, int32>& map_;
   const Map<int32, int32>& const_map_;
 };
 
-TEST_P(MapImplTest, OperatorBracket) {
+TEST_F(MapImplTest, OperatorBracket) {
   int32 key = 0;
   int32 value1 = 100;
   int32 value2 = 101;
@@ -192,7 +186,7 @@ TEST_P(MapImplTest, OperatorBracket) {
   ExpectSingleElement(key, value2);
 }
 
-TEST_P(MapImplTest, OperatorBracketNonExist) {
+TEST_F(MapImplTest, OperatorBracketNonExist) {
   int32 key = 0;
   int32 default_value = 0;
 
@@ -200,7 +194,7 @@ TEST_P(MapImplTest, OperatorBracketNonExist) {
   ExpectSingleElement(key, default_value);
 }
 
-TEST_P(MapImplTest, MutableAt) {
+TEST_F(MapImplTest, MutableAt) {
   int32 key = 0;
   int32 value1 = 100;
   int32 value2 = 101;
@@ -214,15 +208,15 @@ TEST_P(MapImplTest, MutableAt) {
 
 #ifdef PROTOBUF_HAS_DEATH_TEST
 
-TEST_P(MapImplTest, MutableAtNonExistDeathTest) {
+TEST_F(MapImplTest, MutableAtNonExistDeathTest) {
   EXPECT_DEATH(map_.at(0), "");
 }
 
-TEST_P(MapImplTest, ImmutableAtNonExistDeathTest) {
+TEST_F(MapImplTest, ImmutableAtNonExistDeathTest) {
   EXPECT_DEATH(const_map_.at(0), "");
 }
 
-TEST_P(MapImplTest, UsageErrors) {
+TEST_F(MapImplTest, UsageErrors) {
   MapKey key;
   key.SetInt64Value(1);
   EXPECT_DEATH(key.GetUInt64Value(),
@@ -239,23 +233,30 @@ TEST_P(MapImplTest, UsageErrors) {
 
 #endif  // PROTOBUF_HAS_DEATH_TEST
 
-TEST_P(MapImplTest, CountNonExist) {
+TEST_F(MapImplTest, MapKeyAssignment) {
+  MapKey from, to;
+  from.SetStringValue("abc");
+  to = from;
+  EXPECT_EQ("abc", to.GetStringValue());
+}
+
+TEST_F(MapImplTest, CountNonExist) {
   EXPECT_EQ(0, map_.count(0));
 }
 
-TEST_P(MapImplTest, MutableFindNonExist) {
+TEST_F(MapImplTest, MutableFindNonExist) {
   EXPECT_TRUE(map_.end() == map_.find(0));
 }
 
-TEST_P(MapImplTest, ImmutableFindNonExist) {
+TEST_F(MapImplTest, ImmutableFindNonExist) {
   EXPECT_TRUE(const_map_.end() == const_map_.find(0));
 }
 
-TEST_P(MapImplTest, ConstEnd) {
+TEST_F(MapImplTest, ConstEnd) {
   EXPECT_TRUE(const_map_.end() == const_map_.cend());
 }
 
-TEST_P(MapImplTest, GetReferenceFromIterator) {
+TEST_F(MapImplTest, GetReferenceFromIterator) {
   for (int i = 0; i < 10; i++) {
     map_[i] = i;
   }
@@ -278,7 +279,7 @@ TEST_P(MapImplTest, GetReferenceFromIterator) {
   }
 }
 
-TEST_P(MapImplTest, IteratorBasic) {
+TEST_F(MapImplTest, IteratorBasic) {
   map_[0] = 0;
 
   // Default constructible (per forward iterator requirements).
@@ -320,10 +321,9 @@ static int k2 = 1321555333;
 // A naive begin() implementation will cause begin() to get slower and slower
 // if one erases elements at the "front" of the hash map, and we'd like to
 // avoid that, as std::unordered_map does.
-TEST_P(MapImplTest, BeginIsFast) {
-  // Disable this test for both new and old implementations.
-  if (/*GetParam()*/true) return;
-  Map<int32, int32> map(false);  // This test uses new-style maps only.
+TEST_F(MapImplTest, BeginIsFast) {
+  if (true) return;  // TODO(gpike): make this less flaky and re-enable it.
+  Map<int32, int32> map;
   const int kTestSize = 250000;
   // Create a random-looking map of size n.  Use non-negative integer keys.
   uint32 frog = 123983;
@@ -371,7 +371,7 @@ TEST_P(MapImplTest, BeginIsFast) {
 // Try to create kTestSize keys that will land in just a few buckets, and
 // time the insertions, to get a rough estimate of whether an O(n^2) worst case
 // was triggered.  This test is a hacky, but probably better than nothing.
-TEST_P(MapImplTest, HashFlood) {
+TEST_F(MapImplTest, HashFlood) {
   const int kTestSize = 1024;  // must be a power of 2
   std::set<int> s;
   for (int i = 0; s.size() < kTestSize; i++) {
@@ -404,6 +404,22 @@ TEST_P(MapImplTest, HashFlood) {
   EXPECT_LE(x1, x0 * 20);
 }
 
+TEST_F(MapImplTest, CopyIteratorStressTest) {
+  std::vector<Map<int32, int32>::iterator> v;
+  const int kIters = 1e5;
+  for (uint32 i = 0; i < kIters; i++) {
+    int32 key = (3 + i * (5 + i * (-8 + i * (62 + i)))) & 0x77777777;
+    map_[key] = i;
+    v.push_back(map_.find(key));
+  }
+  for (std::vector<Map<int32, int32>::iterator>::const_iterator it = v.begin();
+       it != v.end(); it++) {
+    Map<int32, int32>::iterator i = *it;
+    ASSERT_EQ(i->first, (*it)->first);
+    ASSERT_EQ(i->second, (*it)->second);
+  }
+}
+
 template <typename T, typename U>
 static void TestValidityForAllKeysExcept(int key_to_avoid,
                                          const T& check_map,
@@ -468,11 +484,11 @@ static void TestOldVersusNewIterator(int skip, Map<int, int>* m) {
 }
 
 // Create and test an n-element Map, with emphasis on iterator correctness.
-static void StressTestIterators(int n, bool test_old_style_proto2_maps) {
+static void StressTestIterators(int n) {
   GOOGLE_LOG(INFO) << "StressTestIterators " << n;
   GOOGLE_CHECK_GT(n, 0);
   // Create a random-looking map of size n.  Use non-negative integer keys.
-  Map<int, int> m(test_old_style_proto2_maps);
+  Map<int, int> m;
   uint32 frog = 123987 + n;
   int last_key = 0;
   int counter = 0;
@@ -530,10 +546,7 @@ static void StressTestIterators(int n, bool test_old_style_proto2_maps) {
   }
 }
 
-TEST_P(MapImplTest, IteratorInvalidation) {
-  // As multiple underlying hash_map implementations do not follow the
-  // validation requirement, the test is disabled for old-style maps.
-  if (GetParam()) return;
+TEST_F(MapImplTest, IteratorInvalidation) {
   // Create a set of pseudo-random sizes to test.
 #ifndef NDEBUG
   const int kMaxSizeToTest = 100 * 1000;
@@ -542,7 +555,7 @@ TEST_P(MapImplTest, IteratorInvalidation) {
 #endif
   std::set<int> s;
   int n = kMaxSizeToTest;
-  int frog = k1 + n;
+  unsigned int frog = k1 + n;
   while (n > 1 && s.size() < 25) {
     s.insert(n);
     n = static_cast<int>(n * 100 / (101.0 + (frog & 63)));
@@ -555,15 +568,12 @@ TEST_P(MapImplTest, IteratorInvalidation) {
   s.insert(3);
   // Now, the real work.
   for (std::set<int>::iterator i = s.begin(); i != s.end(); ++i) {
-    StressTestIterators(*i, GetParam());
+    StressTestIterators(*i);
   }
 }
 
 // Test that erase() revalidates iterators.
-TEST_P(MapImplTest, EraseRevalidates) {
-  // As multiple underlying hash_map implementations do not follow the
-  // validation requirement, the test is disabled for old-style maps.
-  if (GetParam()) return;
+TEST_F(MapImplTest, EraseRevalidates) {
   map_[3] = map_[13] = map_[20] = 0;
   const int initial_size = map_.size();
   EXPECT_EQ(3, initial_size);
@@ -595,7 +605,7 @@ bool IsConstHelper(const T& /*t*/) {
   return true;
 }
 
-TEST_P(MapImplTest, IteratorConstness) {
+TEST_F(MapImplTest, IteratorConstness) {
   map_[0] = 0;
   EXPECT_TRUE(IsConstHelper(*map_.cbegin()));
   EXPECT_TRUE(IsConstHelper(*const_map_.begin()));
@@ -608,14 +618,14 @@ bool IsForwardIteratorHelper(T /*t*/) {
   return false;
 }
 
-TEST_P(MapImplTest, IteratorCategory) {
+TEST_F(MapImplTest, IteratorCategory) {
   EXPECT_TRUE(IsForwardIteratorHelper(
       std::iterator_traits<Map<int, int>::iterator>::iterator_category()));
   EXPECT_TRUE(IsForwardIteratorHelper(std::iterator_traits<
       Map<int, int>::const_iterator>::iterator_category()));
 }
 
-TEST_P(MapImplTest, InsertSingle) {
+TEST_F(MapImplTest, InsertSingle) {
   int32 key = 0;
   int32 value1 = 100;
   int32 value2 = 101;
@@ -640,7 +650,7 @@ TEST_P(MapImplTest, InsertSingle) {
   EXPECT_FALSE(result2.second);
 }
 
-TEST_P(MapImplTest, InsertByIterator) {
+TEST_F(MapImplTest, InsertByIterator) {
   int32 key1 = 0;
   int32 key2 = 1;
   int32 value1a = 100;
@@ -663,7 +673,15 @@ TEST_P(MapImplTest, InsertByIterator) {
   ExpectElements(map1);
 }
 
-TEST_P(MapImplTest, EraseSingleByKey) {
+TEST_F(MapImplTest, InsertByInitializerList) {
+  map_.insert({{1, 100}, {2, 200}});
+  ExpectElements({{1, 100}, {2, 200}});
+
+  map_.insert({{2, 201}, {3, 301}});
+  ExpectElements({{1, 100}, {2, 200}, {3, 301}});
+}
+
+TEST_F(MapImplTest, EraseSingleByKey) {
   int32 key = 0;
   int32 value = 100;
 
@@ -681,7 +699,7 @@ TEST_P(MapImplTest, EraseSingleByKey) {
   EXPECT_EQ(0, map_.erase(key));
 }
 
-TEST_P(MapImplTest, EraseMutipleByKey) {
+TEST_F(MapImplTest, EraseMutipleByKey) {
   // erase in one specific order to trigger corner cases
   for (int i = 0; i < 5; i++) {
     map_[i] = i;
@@ -708,7 +726,7 @@ TEST_P(MapImplTest, EraseMutipleByKey) {
   EXPECT_TRUE(map_.end() == map_.find(2));
 }
 
-TEST_P(MapImplTest, EraseSingleByIterator) {
+TEST_F(MapImplTest, EraseSingleByIterator) {
   int32 key = 0;
   int32 value = 100;
 
@@ -723,7 +741,7 @@ TEST_P(MapImplTest, EraseSingleByIterator) {
   EXPECT_TRUE(map_.begin() == map_.end());
 }
 
-TEST_P(MapImplTest, ValidIteratorAfterErase) {
+TEST_F(MapImplTest, ValidIteratorAfterErase) {
   for (int i = 0; i < 10; i++) {
     map_[i] = i;
   }
@@ -743,7 +761,7 @@ TEST_P(MapImplTest, ValidIteratorAfterErase) {
   EXPECT_EQ(5, map_.size());
 }
 
-TEST_P(MapImplTest, EraseByIterator) {
+TEST_F(MapImplTest, EraseByIterator) {
   int32 key1 = 0;
   int32 key2 = 1;
   int32 value1 = 100;
@@ -764,7 +782,7 @@ TEST_P(MapImplTest, EraseByIterator) {
   EXPECT_TRUE(map_.begin() == map_.end());
 }
 
-TEST_P(MapImplTest, Clear) {
+TEST_F(MapImplTest, Clear) {
   int32 key = 0;
   int32 value = 100;
 
@@ -798,16 +816,16 @@ static void CopyConstructorHelper(Arena* arena, Map<int32, int32>* m) {
   EXPECT_EQ(value2, other.at(key2));
 }
 
-TEST_P(MapImplTest, CopyConstructorWithArena) {
+TEST_F(MapImplTest, CopyConstructorWithArena) {
   Arena a;
   CopyConstructorHelper(&a, &map_);
 }
 
-TEST_P(MapImplTest, CopyConstructorWithoutArena) {
+TEST_F(MapImplTest, CopyConstructorWithoutArena) {
   CopyConstructorHelper(NULL, &map_);
 }
 
-TEST_P(MapImplTest, IterConstructor) {
+TEST_F(MapImplTest, IterConstructor) {
   int32 key1 = 0;
   int32 key2 = 1;
   int32 value1 = 100;
@@ -817,15 +835,14 @@ TEST_P(MapImplTest, IterConstructor) {
   map[key1] = value1;
   map[key2] = value2;
 
-  Map<int32, int32> new_map(map.begin(), map.end(),
-                            GetParam());
+  Map<int32, int32> new_map(map.begin(), map.end());
 
   EXPECT_EQ(2, new_map.size());
   EXPECT_EQ(value1, new_map.at(key1));
   EXPECT_EQ(value2, new_map.at(key2));
 }
 
-TEST_P(MapImplTest, Assigner) {
+TEST_F(MapImplTest, Assigner) {
   int32 key1 = 0;
   int32 key2 = 1;
   int32 value1 = 100;
@@ -837,7 +854,7 @@ TEST_P(MapImplTest, Assigner) {
 
   map_.insert(map.begin(), map.end());
 
-  Map<int32, int32> other(GetParam());
+  Map<int32, int32> other;
   int32 key_other = 123;
   int32 value_other = 321;
   other[key_other] = value_other;
@@ -855,16 +872,9 @@ TEST_P(MapImplTest, Assigner) {
   EXPECT_EQ(2, other.size());
   EXPECT_EQ(value1, other.at(key1));
   EXPECT_EQ(value2, other.at(key2));
-
-  // Try assignment to a map with a different choice of "style."
-  Map<int32, int32> m(!GetParam());
-  m = other;
-  EXPECT_EQ(2, m.size());
-  EXPECT_EQ(value1, m.at(key1));
-  EXPECT_EQ(value2, m.at(key2));
 }
 
-TEST_P(MapImplTest, Rehash) {
+TEST_F(MapImplTest, Rehash) {
   const int test_size = 50;
   std::map<int32, int32> reference_map;
   for (int i = 0; i < test_size; i++) {
@@ -881,7 +891,7 @@ TEST_P(MapImplTest, Rehash) {
   EXPECT_TRUE(map_.empty());
 }
 
-TEST_P(MapImplTest, EqualRange) {
+TEST_F(MapImplTest, EqualRange) {
   int key = 100, key_missing = 101;
   map_[key] = 100;
 
@@ -905,14 +915,14 @@ TEST_P(MapImplTest, EqualRange) {
   EXPECT_TRUE(const_map_.end() == const_range.second);
 }
 
-TEST_P(MapImplTest, ConvertToStdMap) {
+TEST_F(MapImplTest, ConvertToStdMap) {
   map_[100] = 101;
   std::map<int32, int32> std_map(map_.begin(), map_.end());
   EXPECT_EQ(1, std_map.size());
   EXPECT_EQ(101, std_map[100]);
 }
 
-TEST_P(MapImplTest, ConvertToStdVectorOfPairs) {
+TEST_F(MapImplTest, ConvertToStdVectorOfPairs) {
   map_[100] = 101;
   std::vector<std::pair<int32, int32> > std_vec(map_.begin(), map_.end());
   EXPECT_EQ(1, std_vec.size());
@@ -920,21 +930,8 @@ TEST_P(MapImplTest, ConvertToStdVectorOfPairs) {
   EXPECT_EQ(101, std_vec[0].second);
 }
 
-TEST_P(MapImplTest, SwapSameStyle) {
-  Map<int32, int32> another(GetParam());  // same old_style_ value
-  map_[9398] = 41999;
-  another[9398] = 41999;
-  another[8070] = 42056;
-  another.swap(map_);
-  EXPECT_THAT(another, testing::UnorderedElementsAre(
-      testing::Pair(9398, 41999)));
-  EXPECT_THAT(map_, testing::UnorderedElementsAre(
-      testing::Pair(8070, 42056),
-      testing::Pair(9398, 41999)));
-}
-
-TEST_P(MapImplTest, SwapDifferentStyle) {
-  Map<int32, int32> another(!GetParam());  // different old_style_ value
+TEST_F(MapImplTest, SwapBasic) {
+  Map<int32, int32> another;
   map_[9398] = 41999;
   another[9398] = 41999;
   another[8070] = 42056;
@@ -946,10 +943,10 @@ TEST_P(MapImplTest, SwapDifferentStyle) {
       testing::Pair(9398, 41999)));
 }
 
-TEST_P(MapImplTest, SwapArena) {
+TEST_F(MapImplTest, SwapArena) {
   Arena arena1, arena2;
-  Map<int32, int32> m1(&arena1, false);
-  Map<int32, int32> m2(&arena2, false);
+  Map<int32, int32> m1(&arena1);
+  Map<int32, int32> m2(&arena2);
   map_[9398] = 41999;
   m1[9398] = 41999;
   m1[8070] = 42056;
@@ -969,7 +966,16 @@ TEST_P(MapImplTest, SwapArena) {
       testing::Pair(9398, 41999)));
 }
 
-INSTANTIATE_TEST_CASE_P(BoolSequence, MapImplTest, testing::Bool());
+TEST_F(MapImplTest, CopyAssignMapIterator) {
+  TestMap message;
+  MapReflectionTester reflection_tester(
+      unittest::TestMap::descriptor());
+  reflection_tester.SetMapFieldsViaMapReflection(&message);
+  MapIterator it1 = reflection_tester.MapBegin(&message, "map_int32_int32");
+  MapIterator it2 = reflection_tester.MapEnd(&message, "map_int32_int32");
+  it2 = it1;
+  EXPECT_EQ(it1.GetKey().GetInt32Value(), it2.GetKey().GetInt32Value());
+}
 
 // Map Field Reflection Test ========================================
 
@@ -992,6 +998,11 @@ static int Int(const string& value) {
 class MapFieldReflectionTest : public testing::Test {
  protected:
   typedef FieldDescriptor FD;
+
+  int MapSize(const Reflection* reflection, const FieldDescriptor* field,
+              const Message& message) {
+    return reflection->MapSize(message, field);
+  }
 };
 
 TEST_F(MapFieldReflectionTest, RegularFields) {
@@ -1253,19 +1264,19 @@ TEST_F(MapFieldReflectionTest, RepeatedFieldRefForRegularFields) {
               &message, fd_map_int32_foreign_message);
 
   // Get entry default instances
-  google::protobuf::scoped_ptr<Message> entry_int32_int32(
+  std::unique_ptr<Message> entry_int32_int32(
       MessageFactory::generated_factory()
           ->GetPrototype(fd_map_int32_int32->message_type())
           ->New());
-  google::protobuf::scoped_ptr<Message> entry_int32_double(
+  std::unique_ptr<Message> entry_int32_double(
       MessageFactory::generated_factory()
           ->GetPrototype(fd_map_int32_double->message_type())
           ->New());
-  google::protobuf::scoped_ptr<Message> entry_string_string(
+  std::unique_ptr<Message> entry_string_string(
       MessageFactory::generated_factory()
           ->GetPrototype(fd_map_string_string->message_type())
           ->New());
-  google::protobuf::scoped_ptr<Message> entry_int32_foreign_message(
+  std::unique_ptr<Message> entry_int32_foreign_message(
       MessageFactory::generated_factory()
           ->GetPrototype(fd_map_int32_foreign_message->message_type())
           ->New());
@@ -1799,6 +1810,51 @@ TEST_F(MapFieldReflectionTest, RepeatedFieldRefMergeFromAndSwap) {
   // TODO(teboring): add test for duplicated key
 }
 
+TEST_F(MapFieldReflectionTest, MapSizeWithDuplicatedKey) {
+  // Dynamic Message
+  {
+    DynamicMessageFactory factory;
+    std::unique_ptr<Message> message(
+        factory.GetPrototype(unittest::TestMap::descriptor())->New());
+    const Reflection* reflection = message->GetReflection();
+    const FieldDescriptor* field =
+        unittest::TestMap::descriptor()->FindFieldByName("map_int32_int32");
+
+    Message* entry1 = reflection->AddMessage(message.get(), field);
+    Message* entry2 = reflection->AddMessage(message.get(), field);
+
+    const Reflection* entry_reflection = entry1->GetReflection();
+    const FieldDescriptor* key_field =
+        entry1->GetDescriptor()->FindFieldByName("key");
+    entry_reflection->SetInt32(entry1, key_field, 1);
+    entry_reflection->SetInt32(entry2, key_field, 1);
+
+    EXPECT_EQ(2, reflection->FieldSize(*message, field));
+    EXPECT_EQ(1, MapSize(reflection, field, *message));
+    EXPECT_EQ(2, reflection->FieldSize(*message, field));
+  }
+
+  // Generated Message
+  {
+    unittest::TestMap message;
+    const Reflection* reflection = message.GetReflection();
+    const FieldDescriptor* field =
+        message.GetDescriptor()->FindFieldByName("map_int32_int32");
+
+    Message* entry1 = reflection->AddMessage(&message, field);
+    Message* entry2 = reflection->AddMessage(&message, field);
+
+    const Reflection* entry_reflection = entry1->GetReflection();
+    const FieldDescriptor* key_field =
+        entry1->GetDescriptor()->FindFieldByName("key");
+    entry_reflection->SetInt32(entry1, key_field, 1);
+    entry_reflection->SetInt32(entry2, key_field, 1);
+
+    EXPECT_EQ(2, reflection->FieldSize(message, field));
+    EXPECT_EQ(1, MapSize(reflection, field, message));
+  }
+}
+
 // Generated Message Test ===========================================
 
 TEST(GeneratedMapFieldTest, Accessors) {
@@ -1944,7 +2000,7 @@ TEST(GeneratedMapFieldTest, CopyFromDynamicMessage) {
 
   // Construct a new version of the dynamic message via the factory.
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message1;
+  std::unique_ptr<Message> message1;
   message1.reset(
       factory.GetPrototype(unittest::TestMap::descriptor())->New());
   MapReflectionTester reflection_tester(
@@ -1961,7 +2017,7 @@ TEST(GeneratedMapFieldTest, CopyFromDynamicMessageMapReflection) {
 
   // Construct a new version of the dynamic message via the factory.
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message1;
+  std::unique_ptr<Message> message1;
   message1.reset(
       factory.GetPrototype(unittest::TestMap::descriptor())->New());
   MapReflectionTester reflection_tester(
@@ -1980,7 +2036,7 @@ TEST(GeneratedMapFieldTest, DynamicMessageCopyFrom) {
 
   // Construct a new version of the dynamic message via the factory.
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message1;
+  std::unique_ptr<Message> message1;
   message1.reset(
       factory.GetPrototype(unittest::TestMap::descriptor())->New());
 
@@ -1999,7 +2055,7 @@ TEST(GeneratedMapFieldTest, DynamicMessageCopyFromMapReflection) {
 
   // Construct a dynamic message via the factory.
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message1;
+  std::unique_ptr<Message> message1;
   message1.reset(
       factory.GetPrototype(unittest::TestMap::descriptor())->New());
 
@@ -2013,7 +2069,7 @@ TEST(GeneratedMapFieldTest, SyncDynamicMapWithRepeatedField) {
   MapReflectionTester reflection_tester(
       unittest::TestMap::descriptor());
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message;
+  std::unique_ptr<Message> message;
   message.reset(
       factory.GetPrototype(unittest::TestMap::descriptor())->New());
   reflection_tester.SetMapFieldsViaReflection(message.get());
@@ -2665,7 +2721,7 @@ TEST_F(MapFieldInDynamicMessageTest, MapIndependentOffsets) {
   // Check that all fields have independent offsets by setting each
   // one to a unique value then checking that they all still have those
   // unique values (i.e. they don't stomp each other).
-  google::protobuf::scoped_ptr<Message> message(map_prototype_->New());
+  std::unique_ptr<Message> message(map_prototype_->New());
   MapReflectionTester reflection_tester(map_descriptor_);
 
   reflection_tester.SetMapFieldsViaReflection(message.get());
@@ -2674,7 +2730,7 @@ TEST_F(MapFieldInDynamicMessageTest, MapIndependentOffsets) {
 
 TEST_F(MapFieldInDynamicMessageTest, DynamicMapReflection) {
   // Check that map fields work properly.
-  google::protobuf::scoped_ptr<Message> message(map_prototype_->New());
+  std::unique_ptr<Message> message(map_prototype_->New());
 
   // Check set functions.
   MapReflectionTester reflection_tester(map_descriptor_);
@@ -2688,7 +2744,7 @@ TEST_F(MapFieldInDynamicMessageTest, MapSpaceUsed) {
   // Since we share the implementation with generated messages, we don't need
   // to test very much here.  Just make sure it appears to be working.
 
-  google::protobuf::scoped_ptr<Message> message(map_prototype_->New());
+  std::unique_ptr<Message> message(map_prototype_->New());
   MapReflectionTester reflection_tester(map_descriptor_);
 
   int initial_space_used = message->SpaceUsed();
@@ -2701,11 +2757,74 @@ TEST_F(MapFieldInDynamicMessageTest, RecursiveMap) {
   TestRecursiveMapMessage from;
   (*from.mutable_a())[""];
   string data = from.SerializeAsString();
-  google::protobuf::scoped_ptr<Message> to(
+  std::unique_ptr<Message> to(
       factory_.GetPrototype(recursive_map_descriptor_)->New());
   ASSERT_TRUE(to->ParseFromString(data));
 }
 
+TEST_F(MapFieldInDynamicMessageTest, MapValueReferernceValidAfterSerialize) {
+  std::unique_ptr<Message> message(map_prototype_->New());
+  MapReflectionTester reflection_tester(map_descriptor_);
+  reflection_tester.SetMapFieldsViaMapReflection(message.get());
+
+  // Get value reference before serialization, so that we know the value is from
+  // map.
+  MapKey map_key;
+  MapValueRef map_val;
+  map_key.SetInt32Value(0);
+  reflection_tester.GetMapValueViaMapReflection(
+      message.get(), "map_int32_foreign_message", map_key, &map_val);
+  Message* submsg = map_val.MutableMessageValue();
+
+  // In previous implementation, calling SerializeToString will cause syncing
+  // from map to repeated field, which will invalidate the submsg we previously
+  // got.
+  string data;
+  message->SerializeToString(&data);
+
+  const Reflection* submsg_reflection = submsg->GetReflection();
+  const Descriptor* submsg_desc = submsg->GetDescriptor();
+  const FieldDescriptor* submsg_field = submsg_desc->FindFieldByName("c");
+  submsg_reflection->SetInt32(submsg, submsg_field, 128);
+
+  message->SerializeToString(&data);
+  TestMap to;
+  to.ParseFromString(data);
+  EXPECT_EQ(128, to.map_int32_foreign_message().at(0).c());
+}
+
+TEST_F(MapFieldInDynamicMessageTest, MapEntryReferernceValidAfterSerialize) {
+  std::unique_ptr<Message> message(map_prototype_->New());
+  MapReflectionTester reflection_tester(map_descriptor_);
+  reflection_tester.SetMapFieldsViaReflection(message.get());
+
+  // Get map entry before serialization, so that we know the it is from
+  // repeated field.
+  Message* map_entry = reflection_tester.GetMapEntryViaReflection(
+      message.get(), "map_int32_foreign_message", 0);
+  const Reflection* map_entry_reflection = map_entry->GetReflection();
+  const Descriptor* map_entry_desc = map_entry->GetDescriptor();
+  const FieldDescriptor* value_field = map_entry_desc->FindFieldByName("value");
+  Message* submsg =
+      map_entry_reflection->MutableMessage(map_entry, value_field);
+
+  // In previous implementation, calling SerializeToString will cause syncing
+  // from repeated field to map, which will invalidate the map_entry we
+  // previously got.
+  string data;
+  message->SerializeToString(&data);
+
+  const Reflection* submsg_reflection = submsg->GetReflection();
+  const Descriptor* submsg_desc = submsg->GetDescriptor();
+  const FieldDescriptor* submsg_field = submsg_desc->FindFieldByName("c");
+  submsg_reflection->SetInt32(submsg, submsg_field, 128);
+
+  message->SerializeToString(&data);
+  TestMap to;
+  to.ParseFromString(data);
+  EXPECT_EQ(128, to.map_int32_foreign_message().at(0).c());
+}
+
 // ReflectionOps Test ===============================================
 
 TEST(ReflectionOpsForMapFieldTest, MapSanityCheck) {
@@ -2768,6 +2887,20 @@ TEST(ReflectionOpsForMapFieldTest, MapDiscardUnknownFields) {
       GetUnknownFields(message).field_count());
 }
 
+TEST(ReflectionOpsForMapFieldTest, IsInitialized) {
+  unittest::TestRequiredMessageMap map_message;
+
+  // Add an uninitialized message.
+  (*map_message.mutable_map_field())[0];
+  EXPECT_FALSE(ReflectionOps::IsInitialized(map_message));
+
+  // Initialize uninitialized message
+  (*map_message.mutable_map_field())[0].set_a(0);
+  (*map_message.mutable_map_field())[0].set_b(0);
+  (*map_message.mutable_map_field())[0].set_c(0);
+  EXPECT_TRUE(ReflectionOps::IsInitialized(map_message));
+}
+
 // Wire Format Test =================================================
 
 TEST(WireFormatForMapFieldTest, ParseMap) {
@@ -2828,6 +2961,33 @@ TEST(WireFormatForMapFieldTest, SerializeMap) {
   EXPECT_TRUE(dynamic_data == generated_data);
 }
 
+TEST(WireFormatForMapFieldTest, SerializeMapDynamicMessage) {
+  DynamicMessageFactory factory;
+  std::unique_ptr<Message> dynamic_message;
+  dynamic_message.reset(
+      factory.GetPrototype(unittest::TestMap::descriptor())->New());
+  MapReflectionTester reflection_tester(
+      unittest::TestMap::descriptor());
+  reflection_tester.SetMapFieldsViaReflection(dynamic_message.get());
+  reflection_tester.ExpectMapFieldsSetViaReflection(*dynamic_message);
+
+  unittest::TestMap generated_message;
+  MapTestUtil::SetMapFields(&generated_message);
+  MapTestUtil::ExpectMapFieldsSet(generated_message);
+
+  string generated_data;
+  string dynamic_data;
+
+  // Serialize.
+  generated_message.SerializeToString(&generated_data);
+  dynamic_message->SerializeToString(&dynamic_data);
+
+  // Because map serialization doesn't guarantee order, we just compare
+  // serialized size here. This is enough to tell dynamic message doesn't miss
+  // anything in serialization.
+  EXPECT_TRUE(dynamic_data.size() == generated_data.size());
+}
+
 TEST(WireFormatForMapFieldTest, MapParseHelpers) {
   string data;
 
@@ -2980,6 +3140,27 @@ TEST(MapSerializationTest, Deterministic) {
   TestDeterministicSerialization(t, "golden_message_maps");
 }
 
+TEST(MapSerializationTest, DeterministicSubmessage) {
+  protobuf_unittest::TestSubmessageMaps p;
+  protobuf_unittest::TestMaps t;
+  const string filename = "golden_message_maps";
+  string golden;
+  GOOGLE_CHECK_OK(File::GetContents(
+      TestSourceDir() + "/google/protobuf/testdata/" + filename,
+      &golden, true));
+  t.ParseFromString(golden);
+  *(p.mutable_m()) = t;
+  std::vector<string> v;
+  // Use multiple attempts to increase the chance of a failure if something is
+  // buggy.  For example, each separate copy of a map might use a different
+  // randomly-chosen hash function.
+  const int kAttempts = 10;
+  for (int i = 0; i < kAttempts; i++) {
+    protobuf_unittest::TestSubmessageMaps q(p);
+    ASSERT_EQ(DeterministicSerialization(q), DeterministicSerialization(p));
+  }
+}
+
 // Text Format Test =================================================
 
 TEST(TextFormatMapTest, SerializeAndParse) {
@@ -3058,7 +3239,7 @@ TEST(ArenaTest, ParsingAndSerializingNoHeapAllocation) {
 }
 
 // Use text format parsing and serializing to test reflection api.
-TEST(ArenaTest, RelfectionInTextFormat) {
+TEST(ArenaTest, ReflectionInTextFormat) {
   Arena arena;
   string data;
 
@@ -3108,6 +3289,42 @@ TEST(ArenaTest, IsInitialized) {
   EXPECT_EQ(0, (*message->mutable_map_int32_int32())[0]);
 }
 
+TEST(MoveTest, MoveConstructorWorks) {
+  Map<int32, TestAllTypes> original_map;
+  original_map[42].mutable_optional_nested_message()->set_bb(42);
+  original_map[43].mutable_optional_nested_message()->set_bb(43);
+  const auto* nested_msg42_ptr = &original_map[42].optional_nested_message();
+  const auto* nested_msg43_ptr = &original_map[43].optional_nested_message();
+
+  Map<int32, TestAllTypes> moved_to_map(std::move(original_map));
+  EXPECT_TRUE(original_map.empty());
+  EXPECT_EQ(2, moved_to_map.size());
+  EXPECT_EQ(42, moved_to_map[42].optional_nested_message().bb());
+  EXPECT_EQ(43, moved_to_map[43].optional_nested_message().bb());
+  // This test takes advantage of the fact that pointers are swapped, so there
+  // should be pointer stability.
+  EXPECT_EQ(nested_msg42_ptr, &moved_to_map[42].optional_nested_message());
+  EXPECT_EQ(nested_msg43_ptr, &moved_to_map[43].optional_nested_message());
+}
+
+TEST(MoveTest, MoveAssignmentWorks) {
+  Map<int32, TestAllTypes> original_map;
+  original_map[42].mutable_optional_nested_message()->set_bb(42);
+  original_map[43].mutable_optional_nested_message()->set_bb(43);
+  const auto* nested_msg42_ptr = &original_map[42].optional_nested_message();
+  const auto* nested_msg43_ptr = &original_map[43].optional_nested_message();
+
+  Map<int32, TestAllTypes> moved_to_map = std::move(original_map);
+  EXPECT_TRUE(original_map.empty());
+  EXPECT_EQ(2, moved_to_map.size());
+  EXPECT_EQ(42, moved_to_map[42].optional_nested_message().bb());
+  EXPECT_EQ(43, moved_to_map[43].optional_nested_message().bb());
+  // This test takes advantage of the fact that pointers are swapped, so there
+  // should be pointer stability.
+  EXPECT_EQ(nested_msg42_ptr, &moved_to_map[42].optional_nested_message());
+  EXPECT_EQ(nested_msg43_ptr, &moved_to_map[43].optional_nested_message());
+}
+
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/map_test_util.cc b/src/google/protobuf/map_test_util.cc
index 3dd6aae5..31ac1736 100644
--- a/src/google/protobuf/map_test_util.cc
+++ b/src/google/protobuf/map_test_util.cc
@@ -744,6 +744,34 @@ void MapReflectionTester::SetMapFieldsViaMapReflection(
       sub_foreign_message, foreign_c_, 1);
 }
 
+void MapReflectionTester::GetMapValueViaMapReflection(Message* message,
+                                                      const string& field_name,
+                                                      const MapKey& map_key,
+                                                      MapValueRef* map_val) {
+  const Reflection* reflection = message->GetReflection();
+  EXPECT_FALSE(reflection->InsertOrLookupMapValue(message, F(field_name),
+                                                  map_key, map_val));
+}
+
+Message* MapReflectionTester::GetMapEntryViaReflection(Message* message,
+                                                       const string& field_name,
+                                                       int index) {
+  const Reflection* reflection = message->GetReflection();
+  return reflection->MutableRepeatedMessage(message, F(field_name), index);
+}
+
+MapIterator MapReflectionTester::MapBegin(Message* message,
+                                          const string& field_name) {
+  const Reflection* reflection = message->GetReflection();
+  return reflection->MapBegin(message, F(field_name));
+}
+
+MapIterator MapReflectionTester::MapEnd(Message* message,
+                                        const string& field_name) {
+  const Reflection* reflection = message->GetReflection();
+  return reflection->MapEnd(message, F(field_name));
+}
+
 void MapReflectionTester::ClearMapFieldsViaReflection(
     Message* message) {
   const Reflection* reflection = message->GetReflection();
diff --git a/src/google/protobuf/map_test_util.h b/src/google/protobuf/map_test_util.h
index deaf0f4f..dd397619 100644
--- a/src/google/protobuf/map_test_util.h
+++ b/src/google/protobuf/map_test_util.h
@@ -106,6 +106,13 @@ class MapReflectionTester {
   void ExpectClearViaReflection(const Message& message);
   void ExpectClearViaReflectionIterator(Message* message);
   void ExpectMapEntryClearViaReflection(Message* message);
+  void GetMapValueViaMapReflection(Message* message,
+                                   const string& field_name,
+                                   const MapKey& map_key, MapValueRef* map_val);
+  Message* GetMapEntryViaReflection(Message* message, const string& field_name,
+                                    int index);
+  MapIterator MapBegin(Message* message, const string& field_name);
+  MapIterator MapEnd(Message* message, const string& field_name);
 
  private:
   const FieldDescriptor* F(const string& name);
diff --git a/src/google/protobuf/map_test_util_impl.h b/src/google/protobuf/map_test_util_impl.h
index b3ba4e06..ad4d1a3d 100644
--- a/src/google/protobuf/map_test_util_impl.h
+++ b/src/google/protobuf/map_test_util_impl.h
@@ -33,14 +33,9 @@
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
+#include <gtest/gtest.h>
 
 
-#define EXPECT_TRUE GOOGLE_CHECK
-#define ASSERT_TRUE GOOGLE_CHECK
-#define EXPECT_FALSE(COND) GOOGLE_CHECK(!(COND))
-#define EXPECT_EQ GOOGLE_CHECK_EQ
-#define ASSERT_EQ GOOGLE_CHECK_EQ
-
 namespace google {
 namespace protobuf_unittest {}  // forward declaration
 
@@ -265,23 +260,23 @@ void MapTestUtilImpl::ExpectClear(const MapMessage& message) {
 template <typename EnumType, EnumType enum_value0,
           EnumType enum_value1, typename MapMessage>
 void MapTestUtilImpl::ExpectMapFieldsSet(const MapMessage& message) {
-  EXPECT_EQ(2, message.map_int32_int32().size());
-  EXPECT_EQ(2, message.map_int64_int64().size());
-  EXPECT_EQ(2, message.map_uint32_uint32().size());
-  EXPECT_EQ(2, message.map_uint64_uint64().size());
-  EXPECT_EQ(2, message.map_sint32_sint32().size());
-  EXPECT_EQ(2, message.map_sint64_sint64().size());
-  EXPECT_EQ(2, message.map_fixed32_fixed32().size());
-  EXPECT_EQ(2, message.map_fixed64_fixed64().size());
-  EXPECT_EQ(2, message.map_sfixed32_sfixed32().size());
-  EXPECT_EQ(2, message.map_sfixed64_sfixed64().size());
-  EXPECT_EQ(2, message.map_int32_float().size());
-  EXPECT_EQ(2, message.map_int32_double().size());
-  EXPECT_EQ(2, message.map_bool_bool().size());
-  EXPECT_EQ(2, message.map_string_string().size());
-  EXPECT_EQ(2, message.map_int32_bytes().size());
-  EXPECT_EQ(2, message.map_int32_enum().size());
-  EXPECT_EQ(2, message.map_int32_foreign_message().size());
+  ASSERT_EQ(2, message.map_int32_int32().size());
+  ASSERT_EQ(2, message.map_int64_int64().size());
+  ASSERT_EQ(2, message.map_uint32_uint32().size());
+  ASSERT_EQ(2, message.map_uint64_uint64().size());
+  ASSERT_EQ(2, message.map_sint32_sint32().size());
+  ASSERT_EQ(2, message.map_sint64_sint64().size());
+  ASSERT_EQ(2, message.map_fixed32_fixed32().size());
+  ASSERT_EQ(2, message.map_fixed64_fixed64().size());
+  ASSERT_EQ(2, message.map_sfixed32_sfixed32().size());
+  ASSERT_EQ(2, message.map_sfixed64_sfixed64().size());
+  ASSERT_EQ(2, message.map_int32_float().size());
+  ASSERT_EQ(2, message.map_int32_double().size());
+  ASSERT_EQ(2, message.map_bool_bool().size());
+  ASSERT_EQ(2, message.map_string_string().size());
+  ASSERT_EQ(2, message.map_int32_bytes().size());
+  ASSERT_EQ(2, message.map_int32_enum().size());
+  ASSERT_EQ(2, message.map_int32_foreign_message().size());
 
   EXPECT_EQ(0, message.map_int32_int32().at(0));
   EXPECT_EQ(0, message.map_int64_int64().at(0));
diff --git a/src/google/protobuf/map_type_handler.h b/src/google/protobuf/map_type_handler.h
index ac987cbc..7f7b1e0e 100644
--- a/src/google/protobuf/map_type_handler.h
+++ b/src/google/protobuf/map_type_handler.h
@@ -32,7 +32,6 @@
 #define GOOGLE_PROTOBUF_TYPE_HANDLER_H__
 
 #include <google/protobuf/arena.h>
-#include <google/protobuf/generated_message_util.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 
 namespace google {
@@ -73,7 +72,7 @@ class MapValueInitializer<true, Type> {
 template <typename Type>
 class MapValueInitializer<false, Type> {
  public:
-  static inline void Initialize(Type& value, int default_enum_value) {}
+  static inline void Initialize(Type& /* value */, int /* default_enum_value */) {}
 };
 
 template <typename Type, bool is_arena_constructable>
@@ -186,9 +185,9 @@ class MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type> {
   static inline Type* EnsureMutable(Type** value, Arena* arena);
   // SpaceUsedInMapEntry: Return bytes used by value in MapEntry, excluding
   // those already calculate in sizeof(MapField).
-  static inline int SpaceUsedInMapEntry(const Type* value);
+  static inline size_t SpaceUsedInMapEntryLong(const Type* value);
   // Return bytes used by value in Map.
-  static inline int SpaceUsedInMap(const Type& value);
+  static inline size_t SpaceUsedInMapLong(const Type& value);
   // Assign default value to given instance.
   static inline void AssignDefaultValue(Type** value);
   // Return default instance if value is not initialized when calling const
@@ -224,9 +223,7 @@ class MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type> {
     static inline void Write(int field, const MapEntryAccessorType& value,    \
                              io::CodedOutputStream* output);                  \
     static inline uint8* InternalWriteToArray(                                \
-        int field,                                                            \
-        const MapEntryAccessorType& value,                                    \
-        bool deterministic,                                                   \
+        int field, const MapEntryAccessorType& value, bool deterministic,     \
         uint8* target);                                                       \
     static inline uint8* WriteToArray(int field,                              \
                                       const MapEntryAccessorType& value,      \
@@ -242,9 +239,9 @@ class MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type> {
     static inline void ClearMaybeByDefaultEnum(TypeOnMemory* value,           \
                                                Arena* arena,                  \
                                                int default_enum);             \
-    static inline int SpaceUsedInMapEntry(const TypeOnMemory& value);         \
-    static inline int SpaceUsedInMap(const TypeOnMemory& value);              \
-    static inline int SpaceUsedInMap(const string& value);                    \
+    static inline size_t SpaceUsedInMapEntryLong(const TypeOnMemory& value);  \
+    static inline size_t SpaceUsedInMapLong(const TypeOnMemory& value);       \
+    static inline size_t SpaceUsedInMapLong(const string& value);             \
     static inline void AssignDefaultValue(TypeOnMemory* value);               \
     static inline const MapEntryAccessorType& DefaultIfNotInitialized(        \
         const TypeOnMemory& value, const TypeOnMemory& default_value);        \
@@ -286,7 +283,7 @@ MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::ByteSize(
   template <typename Type>                                                     \
   inline int MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::ByteSize( \
       const MapEntryAccessorType& value) {                                     \
-    return WireFormatLite::DeclaredType##Size(value);                          \
+    return static_cast<int>(WireFormatLite::DeclaredType##Size(value));        \
   }
 
 GOOGLE_PROTOBUF_BYTE_SIZE(STRING, String)
@@ -304,7 +301,7 @@ GOOGLE_PROTOBUF_BYTE_SIZE(ENUM  , Enum)
 #define FIXED_BYTE_SIZE(FieldType, DeclaredType)                               \
   template <typename Type>                                                     \
   inline int MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::ByteSize( \
-      const MapEntryAccessorType& value) {                                     \
+      const MapEntryAccessorType& /* value */) {                               \
     return WireFormatLite::k##DeclaredType##Size;                              \
   }
 
@@ -322,7 +319,9 @@ template <typename Type>
 inline int
 MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::GetCachedSize(
     const MapEntryAccessorType& value) {
-  return WireFormatLite::LengthDelimitedSize(value.GetCachedSize());
+  return static_cast<int>(
+      WireFormatLite::LengthDelimitedSize(
+          static_cast<size_t>(value.GetCachedSize())));
 }
 
 #define GET_CACHED_SIZE(FieldType, DeclaredType)                         \
@@ -330,7 +329,7 @@ MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::GetCachedSize(
   inline int                                                             \
   MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::GetCachedSize( \
       const MapEntryAccessorType& value) {                               \
-    return WireFormatLite::DeclaredType##Size(value);                    \
+    return static_cast<int>(WireFormatLite::DeclaredType##Size(value));  \
   }
 
 GET_CACHED_SIZE(STRING, String)
@@ -349,7 +348,7 @@ GET_CACHED_SIZE(ENUM  , Enum)
   template <typename Type>                                               \
   inline int                                                             \
   MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::GetCachedSize( \
-      const MapEntryAccessorType& value) {                               \
+      const MapEntryAccessorType& /* value */) {                         \
     return WireFormatLite::k##DeclaredType##Size;                        \
   }
 
@@ -467,34 +466,33 @@ MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
 }
 
 template <typename Type>
-inline int
-MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
-                        Type>::SpaceUsedInMapEntry(const Type* value) {
-  return value->SpaceUsed();
+inline size_t MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
+                             Type>::SpaceUsedInMapEntryLong(const Type* value) {
+  return value->SpaceUsedLong();
 }
 
 template <typename Type>
-int MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::SpaceUsedInMap(
+size_t MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::SpaceUsedInMapLong(
     const Type& value) {
-  return value.SpaceUsed();
+  return value.SpaceUsedLong();
 }
 
 template <typename Type>
 inline void MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::Clear(
-    Type** value, Arena* arena) {
+    Type** value, Arena* /* arena */) {
   if (*value != NULL) (*value)->Clear();
 }
 template <typename Type>
 inline void
 MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
                         Type>::ClearMaybeByDefaultEnum(Type** value,
-                                                       Arena* arena,
-                                                       int default_enum_value) {
+                                                       Arena* /* arena */,
+                                                       int /* default_enum_value */) {
   if (*value != NULL) (*value)->Clear();
 }
 template <typename Type>
 inline void MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::Merge(
-    const Type& from, Type** to, Arena* arena) {
+    const Type& from, Type** to, Arena* /* arena */) {
   (*to)->MergeFrom(from);
 }
 
@@ -507,20 +505,20 @@ void MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::DeleteNoArena(
 template <typename Type>
 inline void MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
                                     Type>::AssignDefaultValue(Type** value) {
-  *value = const_cast<Type*>(&Type::default_instance());
+  *value = const_cast<Type*>(Type::internal_default_instance());
 }
 
 template <typename Type>
 inline void MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
                                     Type>::Initialize(Type** x,
-                                                      Arena* arena) {
+                                                      Arena* /* arena */) {
   *x = NULL;
 }
 
 template <typename Type>
 inline void MapTypeHandler<WireFormatLite::TYPE_MESSAGE, Type>::
-    InitializeMaybeByDefaultEnum(Type** x, int default_enum_value,
-                                 Arena* arena) {
+    InitializeMaybeByDefaultEnum(Type** x, int /* default_enum_value */,
+                                 Arena* /* arena */) {
   *x = NULL;
 }
 
@@ -559,19 +557,21 @@ inline bool MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
     return value.Get();                                                        \
   }                                                                            \
   template <typename Type>                                                     \
-  inline int                                                                   \
-  MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::SpaceUsedInMapEntry( \
-      const TypeOnMemory& value) {                                             \
+  inline size_t                                                                \
+  MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
+                 Type>::SpaceUsedInMapEntryLong(const TypeOnMemory& value) {   \
     return sizeof(value);                                                      \
   }                                                                            \
   template <typename Type>                                                     \
-  inline int MapTypeHandler<WireFormatLite::TYPE_##FieldType,                  \
-                            Type>::SpaceUsedInMap(const TypeOnMemory& value) { \
+  inline size_t                                                                \
+  MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::SpaceUsedInMapLong(  \
+      const TypeOnMemory& value) {                                             \
     return sizeof(value);                                                      \
   }                                                                            \
   template <typename Type>                                                     \
-  inline int MapTypeHandler<WireFormatLite::TYPE_##FieldType,                  \
-                            Type>::SpaceUsedInMap(const string& value) {       \
+  inline size_t                                                                \
+  MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::SpaceUsedInMapLong(  \
+      const string& value) {                                                   \
     return sizeof(value);                                                      \
   }                                                                            \
   template <typename Type>                                                     \
@@ -583,7 +583,7 @@ inline bool MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::         \
       ClearMaybeByDefaultEnum(TypeOnMemory* value, Arena* arena,               \
-                              int default_enum) {                              \
+                              int /* default_enum */) {                        \
     Clear(value, arena);                                                       \
   }                                                                            \
   template <typename Type>                                                     \
@@ -598,18 +598,19 @@ inline bool MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
   }                                                                            \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType,                 \
-                             Type>::AssignDefaultValue(TypeOnMemory* value) {} \
+                             Type>::AssignDefaultValue(TypeOnMemory* /* value */) {} \
   template <typename Type>                                                     \
   inline void                                                                  \
   MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::Initialize(          \
-      TypeOnMemory* value, Arena* arena) {                                     \
+      TypeOnMemory* value, Arena* /* arena */) {                               \
     value->UnsafeSetDefault(                                                   \
         &::google::protobuf::internal::GetEmptyStringAlreadyInited());                   \
   }                                                                            \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::         \
       InitializeMaybeByDefaultEnum(TypeOnMemory* value,                        \
-                                   int default_enum_value, Arena* arena) {     \
+                                   int /* default_enum_value */,               \
+                                   Arena* arena) {                             \
     Initialize(value, arena);                                                  \
   }                                                                            \
   template <typename Type>                                                     \
@@ -626,12 +627,12 @@ inline bool MapTypeHandler<WireFormatLite::TYPE_MESSAGE,
   MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
                  Type>::DefaultIfNotInitialized(const TypeOnMemory& value,     \
                                                 const TypeOnMemory&            \
-                                                    default_value) {           \
+                                                    /* default_value */) {     \
     return value.Get();                                                        \
   }                                                                            \
   template <typename Type>                                                     \
   inline bool MapTypeHandler<WireFormatLite::TYPE_##FieldType,                 \
-                             Type>::IsInitialized(const TypeOnMemory& value) { \
+                             Type>::IsInitialized(const TypeOnMemory& /* value */) { \
     return true;                                                               \
   }
 STRING_OR_BYTES_HANDLER_FUNCTIONS(STRING)
@@ -647,59 +648,58 @@ STRING_OR_BYTES_HANDLER_FUNCTIONS(BYTES)
     return value;                                                              \
   }                                                                            \
   template <typename Type>                                                     \
-  inline int                                                                   \
-  MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::SpaceUsedInMapEntry( \
-      const TypeOnMemory& value) {                                             \
+  inline size_t                                                                \
+  MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
+                 Type>::SpaceUsedInMapEntryLong(const TypeOnMemory& /* value */) {   \
     return 0;                                                                  \
   }                                                                            \
   template <typename Type>                                                     \
-  inline int MapTypeHandler<WireFormatLite::TYPE_##FieldType,                  \
-                            Type>::SpaceUsedInMap(const TypeOnMemory& value) { \
+  inline size_t                                                                \
+  MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::SpaceUsedInMapLong(  \
+      const TypeOnMemory& /* value */) {                                       \
     return sizeof(Type);                                                       \
   }                                                                            \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::Clear(   \
-      TypeOnMemory* value, Arena* arena) {                                     \
+      TypeOnMemory* value, Arena* /* arena */) {                               \
     *value = 0;                                                                \
   }                                                                            \
   template <typename Type>                                                     \
-  inline void                                                                  \
-  MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
-                 Type>::ClearMaybeByDefaultEnum(TypeOnMemory* value,           \
-                                                Arena* arena,                  \
-                                                int default_enum_value) {      \
+  inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::         \
+      ClearMaybeByDefaultEnum(TypeOnMemory* value, Arena* /* arena */,         \
+                              int default_enum_value) {                        \
     *value = static_cast<TypeOnMemory>(default_enum_value);                    \
   }                                                                            \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::Merge(   \
-      const MapEntryAccessorType& from, TypeOnMemory* to, Arena* arena) {      \
+      const MapEntryAccessorType& from, TypeOnMemory* to,                      \
+      Arena* /* arena */) {                                                    \
     *to = from;                                                                \
   }                                                                            \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType,                 \
-                             Type>::DeleteNoArena(TypeOnMemory& x) {}          \
+                             Type>::DeleteNoArena(TypeOnMemory& /* x */) {}    \
   template <typename Type>                                                     \
   inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType,                 \
-                             Type>::AssignDefaultValue(TypeOnMemory* value) {} \
+                             Type>::AssignDefaultValue(TypeOnMemory* /* value */) {} \
   template <typename Type>                                                     \
   inline void                                                                  \
   MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::Initialize(          \
-      TypeOnMemory* value, Arena* arena) {                                     \
+      TypeOnMemory* value, Arena* /* arena */) {                               \
     *value = 0;                                                                \
   }                                                                            \
   template <typename Type>                                                     \
-  inline void                                                                  \
-  MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
-                 Type>::InitializeMaybeByDefaultEnum(TypeOnMemory* value,      \
-                                                     int default_enum_value,   \
-                                                     Arena* arena) {           \
+  inline void MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::         \
+      InitializeMaybeByDefaultEnum(TypeOnMemory* value,                        \
+                                   int default_enum_value,                     \
+                                   Arena* /* arena */) {                       \
     *value = static_cast<TypeOnMemory>(default_enum_value);                    \
   }                                                                            \
   template <typename Type>                                                     \
   inline typename MapTypeHandler<WireFormatLite::TYPE_##FieldType,             \
                                  Type>::MapEntryAccessorType*                  \
   MapTypeHandler<WireFormatLite::TYPE_##FieldType, Type>::EnsureMutable(       \
-      TypeOnMemory* value, Arena* arena) {                                     \
+      TypeOnMemory* value, Arena* /* arena */) {                               \
     return value;                                                              \
   }                                                                            \
   template <typename Type>                                                     \
@@ -708,12 +708,12 @@ STRING_OR_BYTES_HANDLER_FUNCTIONS(BYTES)
   MapTypeHandler<WireFormatLite::TYPE_##FieldType,                             \
                  Type>::DefaultIfNotInitialized(const TypeOnMemory& value,     \
                                                 const TypeOnMemory&            \
-                                                    default_value) {           \
+                                                   /* default_value */) {      \
     return value;                                                              \
   }                                                                            \
   template <typename Type>                                                     \
   inline bool MapTypeHandler<WireFormatLite::TYPE_##FieldType,                 \
-                             Type>::IsInitialized(const TypeOnMemory& value) { \
+                             Type>::IsInitialized(const TypeOnMemory& /* value */) { \
     return true;                                                               \
   }
 PRIMITIVE_HANDLER_FUNCTIONS(INT64)
diff --git a/src/google/protobuf/map_unittest.proto b/src/google/protobuf/map_unittest.proto
index c6154f04..836dc10b 100644
--- a/src/google/protobuf/map_unittest.proto
+++ b/src/google/protobuf/map_unittest.proto
@@ -60,6 +60,7 @@ message TestMap {
   map<int32   , MapEnum > map_int32_enum        = 16;
   map<int32   , ForeignMessage> map_int32_foreign_message = 17;
   map<string  , ForeignMessage> map_string_foreign_message = 18;
+  map<int32   , TestAllTypes> map_int32_all_types = 19;
 }
 
 message TestMapSubmessage {
diff --git a/src/google/protobuf/message.cc b/src/google/protobuf/message.cc
index 6800e4cd..810db233 100644
--- a/src/google/protobuf/message.cc
+++ b/src/google/protobuf/message.cc
@@ -38,20 +38,22 @@
 
 #include <google/protobuf/message.h>
 
+#include <google/protobuf/stubs/casts.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/mutex.h>
 #include <google/protobuf/stubs/once.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/reflection_internal.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_util.h>
 #include <google/protobuf/map_field.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
 #include <google/protobuf/stubs/strutil.h>
+
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/singleton.h>
 #include <google/protobuf/stubs/stl_util.h>
@@ -143,7 +145,13 @@ bool Message::ParsePartialFromIstream(std::istream* input) {
 
 void Message::SerializeWithCachedSizes(
     io::CodedOutputStream* output) const {
-  WireFormat::SerializeWithCachedSizes(*this, GetCachedSize(), output);
+  const internal::SerializationTable* table =
+      static_cast<const internal::SerializationTable*>(InternalGetTable());
+  if (table == 0) {
+    WireFormat::SerializeWithCachedSizes(*this, GetCachedSize(), output);
+  } else {
+    internal::TableSerialize(*this, table, output);
+  }
 }
 
 size_t Message::ByteSizeLong() const {
@@ -158,18 +166,18 @@ void Message::SetCachedSize(int /* size */) const {
                 "Must implement one or the other.";
 }
 
-int Message::SpaceUsed() const {
-  return GetReflection()->SpaceUsed(*this);
+size_t Message::SpaceUsedLong() const {
+  return GetReflection()->SpaceUsedLong(*this);
 }
 
 bool Message::SerializeToFileDescriptor(int file_descriptor) const {
   io::FileOutputStream output(file_descriptor);
-  return SerializeToZeroCopyStream(&output);
+  return SerializeToZeroCopyStream(&output) && output.Flush();
 }
 
 bool Message::SerializePartialToFileDescriptor(int file_descriptor) const {
   io::FileOutputStream output(file_descriptor);
-  return SerializePartialToZeroCopyStream(&output);
+  return SerializePartialToZeroCopyStream(&output) && output.Flush();
 }
 
 bool Message::SerializeToOstream(std::ostream* output) const {
@@ -191,6 +199,10 @@ bool Message::SerializePartialToOstream(std::ostream* output) const {
 
 Reflection::~Reflection() {}
 
+void Reflection::AddAllocatedMessage(Message* /* message */,
+                                     const FieldDescriptor* /*field */,
+                                     Message* /* new_entry */) const {}
+
 #define HANDLE_TYPE(TYPE, CPPTYPE, CTYPE)                             \
 template<>                                                            \
 const RepeatedField<TYPE>& Reflection::GetRepeatedField<TYPE>(        \
@@ -453,7 +465,7 @@ namespace internal {
 template<>
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 // Note: force noinline to workaround MSVC compiler bug with /Zc:inline, issue #240
-GOOGLE_ATTRIBUTE_NOINLINE
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
 #endif
 Message* GenericTypeHandler<Message>::NewFromPrototype(
     const Message* prototype, google::protobuf::Arena* arena) {
@@ -462,7 +474,7 @@ Message* GenericTypeHandler<Message>::NewFromPrototype(
 template<>
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 // Note: force noinline to workaround MSVC compiler bug with /Zc:inline, issue #240
-GOOGLE_ATTRIBUTE_NOINLINE
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
 #endif
 google::protobuf::Arena* GenericTypeHandler<Message>::GetArena(
     Message* value) {
@@ -471,7 +483,7 @@ google::protobuf::Arena* GenericTypeHandler<Message>::GetArena(
 template<>
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 // Note: force noinline to workaround MSVC compiler bug with /Zc:inline, issue #240
-GOOGLE_ATTRIBUTE_NOINLINE
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
 #endif
 void* GenericTypeHandler<Message>::GetMaybeArenaPointer(
     Message* value) {
diff --git a/src/google/protobuf/message.h b/src/google/protobuf/message.h
index 4d14584d..f3d1a58a 100644
--- a/src/google/protobuf/message.h
+++ b/src/google/protobuf/message.h
@@ -112,7 +112,7 @@
 
 #include <iosfwd>
 #include <string>
-#include <google/protobuf/stubs/type_traits.h>
+#include <type_traits>
 #include <vector>
 
 #include <google/protobuf/arena.h>
@@ -152,8 +152,18 @@ class CodedOutputStream;       // coded_stream.h
 namespace python {
 class MapReflectionFriend;     // scalar_map_container.h
 }
+namespace expr {
+class CelMapReflectionFriend;  // field_backed_map_impl.cc
+}
 
 
+namespace internal {
+class ReflectionOps;     // reflection_ops.h
+class MapKeySorter;      // wire_format.cc
+class WireFormat;        // wire_format.h
+class MapFieldReflectionTest;  // map_test.cc
+}
+
 template<typename T>
 class RepeatedField;     // repeated_field.h
 
@@ -245,7 +255,10 @@ class LIBPROTOBUF_EXPORT Message : public MessageLite {
   // using reflection (rather than the generated code implementation for
   // ByteSize()). Like ByteSize(), its CPU time is linear in the number of
   // fields defined for the proto.
-  virtual int SpaceUsed() const;
+  virtual size_t SpaceUsedLong() const;
+
+  PROTOBUF_RUNTIME_DEPRECATED("Please use SpaceUsedLong() instead")
+  int SpaceUsed() const { return internal::ToIntSize(SpaceUsedLong()); }
 
   // Debugging & Testing----------------------------------------------
 
@@ -317,18 +330,19 @@ class LIBPROTOBUF_EXPORT Message : public MessageLite {
   // Typedef for backwards-compatibility.
   typedef google::protobuf::Reflection Reflection;
 
-  // Get a Descriptor for this message's type.  This describes what
-  // fields the message contains, the types of those fields, etc.
+  // Get a non-owning pointer to a Descriptor for this message's type.  This
+  // describes what fields the message contains, the types of those fields, etc.
+  // This object remains property of the Message.
   const Descriptor* GetDescriptor() const { return GetMetadata().descriptor; }
 
-  // Get the Reflection interface for this Message, which can be used to
-  // read and modify the fields of the Message dynamically (in other words,
-  // without knowing the message type at compile time).  This object remains
-  // property of the Message.
+  // Get a non-owning pointer to the Reflection interface for this Message,
+  // which can be used to read and modify the fields of the Message dynamically
+  // (in other words, without knowing the message type at compile time).  This
+  // object remains property of the Message.
   //
   // This method remains virtual in case a subclass does not implement
   // reflection and wants to override the default behavior.
-  virtual const Reflection* GetReflection() const {
+  virtual const Reflection* GetReflection() const final {
     return GetMetadata().reflection;
   }
 
@@ -395,9 +409,6 @@ class MutableRepeatedFieldRef;
 // double the message's memory footprint, probably worse.  Allocating the
 // objects on-demand, on the other hand, would be expensive and prone to
 // memory leaks.  So, instead we ended up with this flat interface.
-//
-// TODO(kenton):  Create a utility class which callers can use to read and
-//   write fields from a Reflection without paying attention to the type.
 class LIBPROTOBUF_EXPORT Reflection {
  public:
   inline Reflection() {}
@@ -417,7 +428,12 @@ class LIBPROTOBUF_EXPORT Reflection {
   virtual UnknownFieldSet* MutableUnknownFields(Message* message) const = 0;
 
   // Estimate the amount of memory used by the message object.
-  virtual int SpaceUsed(const Message& message) const = 0;
+  virtual size_t SpaceUsedLong(const Message& message) const = 0;
+
+  PROTOBUF_RUNTIME_DEPRECATED("Please use SpaceUsedLong() instead")
+  int SpaceUsed(const Message& message) const {
+    return internal::ToIntSize(SpaceUsedLong(message));
+  }
 
   // Check if the given non-repeated field is set.
   virtual bool HasField(const Message& message,
@@ -481,11 +497,14 @@ class LIBPROTOBUF_EXPORT Reflection {
                             int index1,
                             int index2) const = 0;
 
-  // List all fields of the message which are currently set.  This includes
-  // extensions.  Singular fields will only be listed if HasField(field) would
-  // return true and repeated fields will only be listed if FieldSize(field)
-  // would return non-zero.  Fields (both normal fields and extension fields)
-  // will be listed ordered by field number.
+  // List all fields of the message which are currently set, except for unknown
+  // fields, but including extension known to the parser (i.e. compiled in).
+  // Singular fields will only be listed if HasField(field) would return true
+  // and repeated fields will only be listed if FieldSize(field) would return
+  // non-zero.  Fields (both normal fields and extension fields) will be listed
+  // ordered by field number.
+  // Use Reflection::GetUnknownFields() or message.unknown_fields() to also get
+  // access to fields/extensions unknown to the parser.
   virtual void ListFields(
       const Message& message,
       std::vector<const FieldDescriptor*>* output) const = 0;
@@ -739,9 +758,9 @@ class LIBPROTOBUF_EXPORT Reflection {
   // specifyed by 'field' passing ownership to the message.
   // TODO(tmarek): Make virtual after all subclasses have been
   // updated.
-  virtual void AddAllocatedMessage(Message* /* message */,
-                                   const FieldDescriptor* /*field */,
-                                   Message* /* new_entry */) const {}
+  virtual void AddAllocatedMessage(Message* message,
+                                   const FieldDescriptor* field,
+                                   Message* new_entry) const;
 
 
   // Get a RepeatedFieldRef object that can be used to read the underlying
@@ -796,6 +815,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   //
   // for T = Cord and all protobuf scalar types except enums.
   template<typename T>
+  PROTOBUF_RUNTIME_DEPRECATED("Please use GetRepeatedFieldRef() instead")
   const RepeatedField<T>& GetRepeatedField(
       const Message&, const FieldDescriptor*) const;
 
@@ -803,6 +823,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   //
   // for T = Cord and all protobuf scalar types except enums.
   template<typename T>
+  PROTOBUF_RUNTIME_DEPRECATED("Please use GetMutableRepeatedFieldRef() instead")
   RepeatedField<T>* MutableRepeatedField(
       Message*, const FieldDescriptor*) const;
 
@@ -811,6 +832,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   // for T = string, google::protobuf::internal::StringPieceField
   //         google::protobuf::Message & descendants.
   template<typename T>
+  PROTOBUF_RUNTIME_DEPRECATED("Please use GetRepeatedFieldRef() instead")
   const RepeatedPtrField<T>& GetRepeatedPtrField(
       const Message&, const FieldDescriptor*) const;
 
@@ -819,6 +841,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   // for T = string, google::protobuf::internal::StringPieceField
   //         google::protobuf::Message & descendants.
   template<typename T>
+  PROTOBUF_RUNTIME_DEPRECATED("Please use GetMutableRepeatedFieldRef() instead")
   RepeatedPtrField<T>* MutableRepeatedPtrField(
       Message*, const FieldDescriptor*) const;
 
@@ -907,7 +930,7 @@ class LIBPROTOBUF_EXPORT Reflection {
 
   // Returns a raw pointer to the repeated field
   //
-  // "cpp_type" and "message_type" are decuded from the type parameter T passed
+  // "cpp_type" and "message_type" are deduced from the type parameter T passed
   // to Get(Mutable)RepeatedFieldRef. If T is a generated message type,
   // "message_type" should be set to its descriptor. Otherwise "message_type"
   // should be set to NULL. Implementations of this method should check whether
@@ -930,6 +953,12 @@ class LIBPROTOBUF_EXPORT Reflection {
   template<typename T, typename Enable>
   friend class MutableRepeatedFieldRef;
   friend class ::google::protobuf::python::MapReflectionFriend;
+#define GOOGLE_PROTOBUF_HAS_CEL_MAP_REFLECTION_FRIEND
+  friend class ::google::protobuf::expr::CelMapReflectionFriend;
+  friend class internal::MapFieldReflectionTest;
+  friend class internal::MapKeySorter;
+  friend class internal::WireFormat;
+  friend class internal::ReflectionOps;
 
   // Special version for specialized implementations of string.  We can't call
   // MutableRawRepeatedField directly here because we don't have access to
@@ -944,7 +973,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   // TODO(jieluo) - make the map APIs pure virtual after updating
   // all the subclasses.
   // Returns true if key is in map. Returns false if key is not in map field.
-  virtual bool ContainsMapKey(const Message& /* message*/,
+  virtual bool ContainsMapKey(const Message& /* message */,
                               const FieldDescriptor* /* field */,
                               const MapKey& /* key */) const {
     return false;
@@ -962,7 +991,7 @@ class LIBPROTOBUF_EXPORT Reflection {
 
   // Delete and returns true if key is in the map field. Returns false
   // otherwise.
-  virtual bool DeleteMapValue(Message* /* mesage */,
+  virtual bool DeleteMapValue(Message* /* message */,
                               const FieldDescriptor* /* field */,
                               const MapKey& /* key */) const {
     return false;
diff --git a/src/google/protobuf/message_lite.cc b/src/google/protobuf/message_lite.cc
index b8cb3f4c..123b142d 100644
--- a/src/google/protobuf/message_lite.cc
+++ b/src/google/protobuf/message_lite.cc
@@ -103,15 +103,15 @@ string InitializationErrorMessage(const char* action,
 // call MergePartialFromCodedStream().  However, when parsing very small
 // messages, every function call introduces significant overhead.  To avoid
 // this without reproducing code, we use these forced-inline helpers.
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InlineMergeFromCodedStream(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool InlineMergeFromCodedStream(
     io::CodedInputStream* input, MessageLite* message);
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InlineParseFromCodedStream(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool InlineParseFromCodedStream(
     io::CodedInputStream* input, MessageLite* message);
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InlineParsePartialFromCodedStream(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool InlineParsePartialFromCodedStream(
     io::CodedInputStream* input, MessageLite* message);
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InlineParseFromArray(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool InlineParseFromArray(
     const void* data, int size, MessageLite* message);
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool InlineParsePartialFromArray(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool InlineParsePartialFromArray(
     const void* data, int size, MessageLite* message);
 
 inline bool InlineMergeFromCodedStream(io::CodedInputStream* input,
@@ -222,17 +222,9 @@ bool MessageLite::ParsePartialFromArray(const void* data, int size) {
 
 // ===================================================================
 
-uint8* MessageLite::InternalSerializeWithCachedSizesToArray(
-    bool deterministic, uint8* target) const {
-  // We only optimize this when using optimize_for = SPEED.  In other cases
-  // we just use the CodedOutputStream path.
-  int size = GetCachedSize();
-  io::ArrayOutputStream out(target, size);
-  io::CodedOutputStream coded_out(&out);
-  coded_out.SetSerializationDeterministic(deterministic);
-  SerializeWithCachedSizes(&coded_out);
-  GOOGLE_CHECK(!coded_out.HadError());
-  return target + size;
+uint8* MessageLite::SerializeWithCachedSizesToArray(uint8* target) const {
+  return InternalSerializeWithCachedSizesToArray(
+      io::CodedOutputStream::IsDefaultSerializationDeterministic(), target);
 }
 
 bool MessageLite::SerializeToCodedStream(io::CodedOutputStream* output) const {
@@ -352,6 +344,39 @@ string MessageLite::SerializePartialAsString() const {
   return output;
 }
 
+void MessageLite::SerializeWithCachedSizes(
+    io::CodedOutputStream* output) const {
+  GOOGLE_DCHECK(InternalGetTable());
+  internal::TableSerialize(
+      *this,
+      static_cast<const internal::SerializationTable*>(InternalGetTable()),
+      output);
+}
+
+// The table driven code optimizes the case that the CodedOutputStream buffer
+// is large enough to serialize into it directly.
+// If the proto is optimized for speed, this method will be overridden by
+// generated code for maximum speed. If the proto is optimized for size or
+// is lite, then we need to specialize this to avoid infinite recursion.
+uint8* MessageLite::InternalSerializeWithCachedSizesToArray(
+    bool deterministic, uint8* target) const {
+  const internal::SerializationTable* table =
+      static_cast<const internal::SerializationTable*>(InternalGetTable());
+  if (table == NULL) {
+    // We only optimize this when using optimize_for = SPEED.  In other cases
+    // we just use the CodedOutputStream path.
+    int size = GetCachedSize();
+    io::ArrayOutputStream out(target, size);
+    io::CodedOutputStream coded_out(&out);
+    coded_out.SetSerializationDeterministic(deterministic);
+    SerializeWithCachedSizes(&coded_out);
+    GOOGLE_CHECK(!coded_out.HadError());
+    return target + size;
+  } else {
+    return internal::TableSerializeToArray(*this, table, deterministic, target);
+  }
+}
+
 namespace internal {
 template<>
 MessageLite* GenericTypeHandler<MessageLite>::NewFromPrototype(
@@ -368,6 +393,14 @@ void GenericTypeHandler<string>::Merge(const string& from,
                                               string* to) {
   *to = from;
 }
+
+bool proto3_preserve_unknown_ = true;
+
+void SetProto3PreserveUnknownsDefault(bool preserve) {
+  proto3_preserve_unknown_ = preserve;
+}
+
+
 }  // namespace internal
 
 }  // namespace protobuf
diff --git a/src/google/protobuf/message_lite.h b/src/google/protobuf/message_lite.h
index 5e5ed306..4cbec330 100644
--- a/src/google/protobuf/message_lite.h
+++ b/src/google/protobuf/message_lite.h
@@ -42,21 +42,110 @@
 #include <climits>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
-
+#include <google/protobuf/stubs/once.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/stubs/port.h>
 
 namespace google {
 namespace protobuf {
-  class Arena;
+template <typename T>
+class RepeatedPtrField;
 namespace io {
-  class CodedInputStream;
-  class CodedOutputStream;
-  class ZeroCopyInputStream;
-  class ZeroCopyOutputStream;
+class CodedInputStream;
+class CodedOutputStream;
+class ZeroCopyInputStream;
+class ZeroCopyOutputStream;
 }
 namespace internal {
-  class WireFormatLite;
+
+class RepeatedPtrFieldBase;
+class WireFormatLite;
+class WeakFieldMap;
+
+#ifndef SWIG
+// We compute sizes as size_t but cache them as int.  This function converts a
+// computed size to a cached size.  Since we don't proceed with serialization
+// if the total size was > INT_MAX, it is not important what this function
+// returns for inputs > INT_MAX.  However this case should not error or
+// GOOGLE_CHECK-fail, because the full size_t resolution is still returned from
+// ByteSizeLong() and checked against INT_MAX; we can catch the overflow
+// there.
+inline int ToCachedSize(size_t size) { return static_cast<int>(size); }
+
+// We mainly calculate sizes in terms of size_t, but some functions that
+// compute sizes return "int".  These int sizes are expected to always be
+// positive. This function is more efficient than casting an int to size_t
+// directly on 64-bit platforms because it avoids making the compiler emit a
+// sign extending instruction, which we don't want and don't want to pay for.
+inline size_t FromIntSize(int size) {
+  // Convert to unsigned before widening so sign extension is not necessary.
+  return static_cast<unsigned int>(size);
+}
+
+// For cases where a legacy function returns an integer size.  We GOOGLE_DCHECK()
+// that the conversion will fit within an integer; if this is false then we
+// are losing information.
+inline int ToIntSize(size_t size) {
+  GOOGLE_DCHECK_LE(size, static_cast<size_t>(INT_MAX));
+  return static_cast<int>(size);
 }
 
+// This type wraps a variable whose constructor and destructor are explicitly
+// called. It is particularly useful for a global variable, without its
+// constructor and destructor run on start and end of the program lifetime.
+// This circumvents the initial construction order fiasco, while keeping
+// the address of the empty string a compile time constant.
+//
+// Pay special attention to the initialization state of the object.
+// 1. The object is "uninitialized" to begin with.
+// 2. Call DefaultConstruct() only if the object is uninitialized.
+//    After the call, the object becomes "initialized".
+// 3. Call get() and get_mutable() only if the object is initialized.
+// 4. Call Destruct() only if the object is initialized.
+//    After the call, the object becomes uninitialized.
+template <typename T>
+class ExplicitlyConstructed {
+ public:
+  void DefaultConstruct() {
+    new (&union_) T();
+  }
+
+  void Destruct() {
+    get_mutable()->~T();
+  }
+
+  constexpr const T& get() const { return reinterpret_cast<const T&>(union_); }
+  T* get_mutable() { return reinterpret_cast<T*>(&union_); }
+
+ private:
+  // Prefer c++14 aligned_storage, but for compatibility this will do.
+  union AlignedUnion {
+    char space[sizeof(T)];
+    int64 align_to_int64;
+    void* align_to_ptr;
+  } union_;
+};
+
+// Default empty string object. Don't use this directly. Instead, call
+// GetEmptyString() to get the reference.
+LIBPROTOBUF_EXPORT extern ExplicitlyConstructed<::std::string> fixed_address_empty_string;
+LIBPROTOBUF_EXPORT extern ProtobufOnceType empty_string_once_init_;
+LIBPROTOBUF_EXPORT void InitEmptyString();
+
+
+LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyStringAlreadyInited() {
+  return fixed_address_empty_string.get();
+}
+
+LIBPROTOBUF_EXPORT inline const ::std::string& GetEmptyString() {
+  ::google::protobuf::GoogleOnceInit(&empty_string_once_init_, &InitEmptyString);
+  return GetEmptyStringAlreadyInited();
+}
+
+LIBPROTOBUF_EXPORT size_t StringSpaceUsedExcludingSelfLong(const string& str);
+#endif  // SWIG
+}  // namespace internal
+
 // Interface to light weight protocol messages.
 //
 // This interface is implemented by all protocol message objects.  Non-lite
@@ -101,18 +190,19 @@ class LIBPROTOBUF_EXPORT MessageLite {
   // Get the arena, if any, associated with this message. Virtual method
   // required for generic operations but most arena-related operations should
   // use the GetArenaNoVirtual() generated-code method. Default implementation
-  // to reduce code size by avoiding the need for per-type implementations when
-  // types do not implement arena support.
+  // to reduce code size by avoiding the need for per-type implementations
+  // when types do not implement arena support.
   virtual ::google::protobuf::Arena* GetArena() const { return NULL; }
 
-  // Get a pointer that may be equal to this message's arena, or may not be. If
-  // the value returned by this method is equal to some arena pointer, then this
-  // message is on that arena; however, if this message is on some arena, this
-  // method may or may not return that arena's pointer. As a tradeoff, this
-  // method may be more efficient than GetArena(). The intent is to allow
-  // underlying representations that use e.g. tagged pointers to sometimes store
-  // the arena pointer directly, and sometimes in a more indirect way, and allow
-  // a fastpath comparison against the arena pointer when it's easy to obtain.
+  // Get a pointer that may be equal to this message's arena, or may not be.
+  // If the value returned by this method is equal to some arena pointer, then
+  // this message is on that arena; however, if this message is on some arena,
+  // this method may or may not return that arena's pointer. As a tradeoff,
+  // this method may be more efficient than GetArena(). The intent is to allow
+  // underlying representations that use e.g. tagged pointers to sometimes
+  // store the arena pointer directly, and sometimes in a more indirect way,
+  // and allow a fastpath comparison against the arena pointer when it's easy
+  // to obtain.
   virtual void* GetMaybeArenaPointer() const { return GetArena(); }
 
   // Clear all fields of the message and set them to their default values.
@@ -130,19 +220,20 @@ class LIBPROTOBUF_EXPORT MessageLite {
   // for full messages.  See message.h.
   virtual string InitializationErrorString() const;
 
-  // If |other| is the exact same class as this, calls MergeFrom().  Otherwise,
+  // If |other| is the exact same class as this, calls MergeFrom(). Otherwise,
   // results are undefined (probably crash).
   virtual void CheckTypeAndMergeFrom(const MessageLite& other) = 0;
 
   // Parsing ---------------------------------------------------------
   // Methods for parsing in protocol buffer format.  Most of these are
-  // just simple wrappers around MergeFromCodedStream().  Clear() will be called
-  // before merging the input.
-
-  // Fill the message with a protocol buffer parsed from the given input stream.
-  // Returns false on a read error or if the input is in the wrong format.  A
-  // successful return does not indicate the entire input is consumed, ensure
-  // you call ConsumedEntireMessage() to check that if applicable.
+  // just simple wrappers around MergeFromCodedStream().  Clear() will be
+  // called before merging the input.
+
+  // Fill the message with a protocol buffer parsed from the given input
+  // stream. Returns false on a read error or if the input is in the wrong
+  // format.  A successful return does not indicate the entire input is
+  // consumed, ensure you call ConsumedEntireMessage() to check that if
+  // applicable.
   bool ParseFromCodedStream(io::CodedInputStream* input);
   // Like ParseFromCodedStream(), but accepts messages that are missing
   // required fields.
@@ -178,7 +269,7 @@ class LIBPROTOBUF_EXPORT MessageLite {
 
 
   // Reads a protocol buffer from the stream and merges it into this
-  // Message.  Singular fields read from the input overwrite what is
+  // Message.  Singular fields read from the what is
   // already in the Message and repeated fields are appended to those
   // already present.
   //
@@ -248,23 +339,28 @@ class LIBPROTOBUF_EXPORT MessageLite {
   virtual size_t ByteSizeLong() const = 0;
 
   // Legacy ByteSize() API.
+  PROTOBUF_RUNTIME_DEPRECATED("Please use ByteSizeLong() instead")
   int ByteSize() const {
-    size_t result = ByteSizeLong();
-    GOOGLE_DCHECK_LE(result, static_cast<size_t>(INT_MAX));
-    return static_cast<int>(result);
+    return internal::ToIntSize(ByteSizeLong());
   }
 
   // Serializes the message without recomputing the size.  The message must not
   // have changed since the last call to ByteSize(), and the value returned by
   // ByteSize must be non-negative.  Otherwise the results are undefined.
   virtual void SerializeWithCachedSizes(
-      io::CodedOutputStream* output) const = 0;
+      io::CodedOutputStream* output) const;
 
-  // A version of SerializeWithCachedSizesToArray, below, that does
-  // not guarantee deterministic serialization.
-  virtual uint8* SerializeWithCachedSizesToArray(uint8* target) const {
-    return InternalSerializeWithCachedSizesToArray(false, target);
-  }
+  // Functions below here are not part of the public interface.  It isn't
+  // enforced, but they should be treated as private, and will be private
+  // at some future time.  Unfortunately the implementation of the "friend"
+  // keyword in GCC is broken at the moment, but we expect it will be fixed.
+
+  // Like SerializeWithCachedSizes, but writes directly to *target, returning
+  // a pointer to the byte immediately after the last byte written.  "target"
+  // must point at a byte array of at least ByteSize() bytes.  Whether to use
+  // deterministic serialization, e.g., maps in sorted order, is determined by
+  // CodedOutputStream::IsDefaultSerializationDeterministic().
+  virtual uint8* SerializeWithCachedSizesToArray(uint8* target) const;
 
   // Returns the result of the last call to ByteSize().  An embedded message's
   // size is needed both to serialize it (because embedded messages are
@@ -279,25 +375,57 @@ class LIBPROTOBUF_EXPORT MessageLite {
   // method.)
   virtual int GetCachedSize() const = 0;
 
-  // Functions below here are not part of the public interface.  It isn't
-  // enforced, but they should be treated as private, and will be private
-  // at some future time.  Unfortunately the implementation of the "friend"
-  // keyword in GCC is broken at the moment, but we expect it will be fixed.
-
-  // Like SerializeWithCachedSizes, but writes directly to *target, returning
-  // a pointer to the byte immediately after the last byte written.  "target"
-  // must point at a byte array of at least ByteSize() bytes.  If deterministic
-  // is true then we use deterministic serialization, e.g., map keys are sorted.
-  // FOR INTERNAL USE ONLY!
   virtual uint8* InternalSerializeWithCachedSizesToArray(bool deterministic,
                                                          uint8* target) const;
 
+ protected:
+  // CastToBase allows generated code to cast a RepeatedPtrField<T> to
+  // RepeatedPtrFieldBase. We try to restrict access to RepeatedPtrFieldBase
+  // because it is an implementation detail that user code should not access
+  // directly.
+  template <typename T>
+  static ::google::protobuf::internal::RepeatedPtrFieldBase* CastToBase(
+      ::google::protobuf::RepeatedPtrField<T>* repeated) {
+    return repeated;
+  }
+  template <typename T>
+  static const ::google::protobuf::internal::RepeatedPtrFieldBase& CastToBase(
+      const ::google::protobuf::RepeatedPtrField<T>& repeated) {
+    return repeated;
+  }
+
+  template <typename T>
+  static T* CreateMaybeMessage(Arena* arena) {
+    return Arena::CreateMaybeMessage<T>(arena);
+  }
+
  private:
+  // TODO(gerbens) make this a pure abstract function
+  virtual const void* InternalGetTable() const { return NULL; }
+
   friend class internal::WireFormatLite;
+  friend class Message;
+  friend class internal::WeakFieldMap;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageLite);
 };
 
+namespace internal {
+
+extern bool LIBPROTOBUF_EXPORT proto3_preserve_unknown_;
+
+// DO NOT USE: For migration only. Will be removed when Proto3 defaults to
+// preserve unknowns.
+inline bool GetProto3PreserveUnknownsDefault() {
+  return proto3_preserve_unknown_;
+}
+
+// DO NOT USE: For migration only. Will be removed when Proto3 defaults to
+// preserve unknowns.
+void LIBPROTOBUF_EXPORT SetProto3PreserveUnknownsDefault(bool preserve);
+}  // namespace internal
+
+
 }  // namespace protobuf
 
 }  // namespace google
diff --git a/src/google/protobuf/message_unittest.cc b/src/google/protobuf/message_unittest.cc
index c1b05bc1..45b46bee 100644
--- a/src/google/protobuf/message_unittest.cc
+++ b/src/google/protobuf/message_unittest.cc
@@ -32,545 +32,20 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
-#include <google/protobuf/message.h>
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#ifdef _MSC_VER
-#include <io.h>
-#else
-#include <unistd.h>
-#endif
-#include <sstream>
-#include <fstream>
-
-#include <google/protobuf/test_util.h>
 #include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/io/zero_copy_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/generated_message_reflection.h>
 
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/testing/googletest.h>
-#include <gtest/gtest.h>
+#define MESSAGE_TEST_NAME MessageTest
+#define MESSAGE_FACTORY_TEST_NAME MessageFactoryTest
+#define UNITTEST_PACKAGE_NAME "protobuf_unittest"
+#define UNITTEST ::protobuf_unittest
+#define UNITTEST_IMPORT ::protobuf_unittest_import
+
+// Must include after the above macros.
+#include <google/protobuf/test_util.inc>
+#include <google/protobuf/message_unittest.inc>
 
+// Make extract script happy.
 namespace google {
 namespace protobuf {
-
-#ifndef O_BINARY
-#ifdef _O_BINARY
-#define O_BINARY _O_BINARY
-#else
-#define O_BINARY 0     // If this isn't defined, the platform doesn't need it.
-#endif
-#endif
-
-TEST(MessageTest, SerializeHelpers) {
-  // TODO(kenton):  Test more helpers?  They're all two-liners so it seems
-  //   like a waste of time.
-
-  protobuf_unittest::TestAllTypes message;
-  TestUtil::SetAllFields(&message);
-  std::stringstream stream;
-
-  string str1("foo");
-  string str2("bar");
-
-  EXPECT_TRUE(message.SerializeToString(&str1));
-  EXPECT_TRUE(message.AppendToString(&str2));
-  EXPECT_TRUE(message.SerializeToOstream(&stream));
-
-  EXPECT_EQ(str1.size() + 3, str2.size());
-  EXPECT_EQ("bar", str2.substr(0, 3));
-  // Don't use EXPECT_EQ because we don't want to dump raw binary data to
-  // stdout.
-  EXPECT_TRUE(str2.substr(3) == str1);
-
-  // GCC gives some sort of error if we try to just do stream.str() == str1.
-  string temp = stream.str();
-  EXPECT_TRUE(temp == str1);
-
-  EXPECT_TRUE(message.SerializeAsString() == str1);
-
-}
-
-TEST(MessageTest, SerializeToBrokenOstream) {
-  std::ofstream out;
-  protobuf_unittest::TestAllTypes message;
-  message.set_optional_int32(123);
-
-  EXPECT_FALSE(message.SerializeToOstream(&out));
-}
-
-TEST(MessageTest, ParseFromFileDescriptor) {
-  string filename = TestSourceDir() +
-                    "/google/protobuf/testdata/golden_message";
-  int file = open(filename.c_str(), O_RDONLY | O_BINARY);
-
-  unittest::TestAllTypes message;
-  EXPECT_TRUE(message.ParseFromFileDescriptor(file));
-  TestUtil::ExpectAllFieldsSet(message);
-
-  EXPECT_GE(close(file), 0);
-}
-
-TEST(MessageTest, ParsePackedFromFileDescriptor) {
-  string filename =
-      TestSourceDir() +
-      "/google/protobuf/testdata/golden_packed_fields_message";
-  int file = open(filename.c_str(), O_RDONLY | O_BINARY);
-
-  unittest::TestPackedTypes message;
-  EXPECT_TRUE(message.ParseFromFileDescriptor(file));
-  TestUtil::ExpectPackedFieldsSet(message);
-
-  EXPECT_GE(close(file), 0);
-}
-
-TEST(MessageTest, ParseHelpers) {
-  // TODO(kenton):  Test more helpers?  They're all two-liners so it seems
-  //   like a waste of time.
-  string data;
-
-  {
-    // Set up.
-    protobuf_unittest::TestAllTypes message;
-    TestUtil::SetAllFields(&message);
-    message.SerializeToString(&data);
-  }
-
-  {
-    // Test ParseFromString.
-    protobuf_unittest::TestAllTypes message;
-    EXPECT_TRUE(message.ParseFromString(data));
-    TestUtil::ExpectAllFieldsSet(message);
-  }
-
-  {
-    // Test ParseFromIstream.
-    protobuf_unittest::TestAllTypes message;
-    std::stringstream stream(data);
-    EXPECT_TRUE(message.ParseFromIstream(&stream));
-    EXPECT_TRUE(stream.eof());
-    TestUtil::ExpectAllFieldsSet(message);
-  }
-
-  {
-    // Test ParseFromBoundedZeroCopyStream.
-    string data_with_junk(data);
-    data_with_junk.append("some junk on the end");
-    io::ArrayInputStream stream(data_with_junk.data(), data_with_junk.size());
-    protobuf_unittest::TestAllTypes message;
-    EXPECT_TRUE(message.ParseFromBoundedZeroCopyStream(&stream, data.size()));
-    TestUtil::ExpectAllFieldsSet(message);
-  }
-
-  {
-    // Test that ParseFromBoundedZeroCopyStream fails (but doesn't crash) if
-    // EOF is reached before the expected number of bytes.
-    io::ArrayInputStream stream(data.data(), data.size());
-    protobuf_unittest::TestAllTypes message;
-    EXPECT_FALSE(
-      message.ParseFromBoundedZeroCopyStream(&stream, data.size() + 1));
-  }
-}
-
-TEST(MessageTest, ParseFailsIfNotInitialized) {
-  unittest::TestRequired message;
-  std::vector<string> errors;
-
-  {
-    ScopedMemoryLog log;
-    EXPECT_FALSE(message.ParseFromString(""));
-    errors = log.GetMessages(ERROR);
-  }
-
-  ASSERT_EQ(1, errors.size());
-  EXPECT_EQ("Can't parse message of type \"protobuf_unittest.TestRequired\" "
-            "because it is missing required fields: a, b, c",
-            errors[0]);
-}
-
-TEST(MessageTest, BypassInitializationCheckOnParse) {
-  unittest::TestRequired message;
-  io::ArrayInputStream raw_input(NULL, 0);
-  io::CodedInputStream input(&raw_input);
-  EXPECT_TRUE(message.MergePartialFromCodedStream(&input));
-}
-
-TEST(MessageTest, InitializationErrorString) {
-  unittest::TestRequired message;
-  EXPECT_EQ("a, b, c", message.InitializationErrorString());
-}
-
-TEST(MessageTest, DynamicCastToGenerated) {
-  unittest::TestAllTypes test_all_types;
-
-  google::protobuf::Message* test_all_types_pointer = &test_all_types;
-  EXPECT_EQ(&test_all_types,
-            google::protobuf::internal::DynamicCastToGenerated<unittest::TestAllTypes>(
-                test_all_types_pointer));
-  EXPECT_EQ(NULL,
-            google::protobuf::internal::DynamicCastToGenerated<unittest::TestRequired>(
-                test_all_types_pointer));
-
-  const google::protobuf::Message* test_all_types_pointer_const = &test_all_types;
-  EXPECT_EQ(
-      &test_all_types,
-      google::protobuf::internal::DynamicCastToGenerated<const unittest::TestAllTypes>(
-          test_all_types_pointer_const));
-  EXPECT_EQ(
-      NULL,
-      google::protobuf::internal::DynamicCastToGenerated<const unittest::TestRequired>(
-          test_all_types_pointer_const));
-}
-
-#ifdef PROTOBUF_HAS_DEATH_TEST  // death tests do not work on Windows yet.
-
-TEST(MessageTest, SerializeFailsIfNotInitialized) {
-  unittest::TestRequired message;
-  string data;
-  EXPECT_DEBUG_DEATH(EXPECT_TRUE(message.SerializeToString(&data)),
-    "Can't serialize message of type \"protobuf_unittest.TestRequired\" because "
-    "it is missing required fields: a, b, c");
-}
-
-TEST(MessageTest, CheckInitialized) {
-  unittest::TestRequired message;
-  EXPECT_DEATH(message.CheckInitialized(),
-    "Message of type \"protobuf_unittest.TestRequired\" is missing required "
-    "fields: a, b, c");
-}
-
-TEST(MessageTest, CheckOverflow) {
-  unittest::TestAllTypes message;
-  // Create a message with size just over 2GB. This triggers integer overflow
-  // when computing message size.
-  const string data(1024, 'x');
-  Cord one_megabyte;
-  for (int i = 0; i < 1024; i++) {
-    one_megabyte.Append(data);
-  }
-
-  for (int i = 0; i < 2 * 1024 + 1; ++i) {
-    message.add_repeated_cord()->CopyFrom(one_megabyte);
-  }
-
-  Cord serialized;
-  EXPECT_FALSE(message.AppendToCord(&serialized));
-}
-
-TEST(MessageTest, CheckBigOverflow) {
-  unittest::TestAllTypes message;
-  // Create a message with size just over 4GB. We should be able to detect this
-  // too, even though it will make a plain "int" wrap back to a positive number.
-  const string data(1024, 'x');
-  Cord one_megabyte;
-  for (int i = 0; i < 1024; i++) {
-    one_megabyte.Append(data);
-  }
-
-  for (int i = 0; i < 4 * 1024 + 1; ++i) {
-    message.add_repeated_cord()->CopyFrom(one_megabyte);
-  }
-
-  Cord serialized;
-  EXPECT_FALSE(message.AppendToCord(&serialized));
-}
-
-#endif  // PROTOBUF_HAS_DEATH_TEST
-
-namespace {
-// An input stream that repeats a string's content for a number of times. It
-// helps us create a really large input without consuming too much memory. Used
-// to test the parsing behavior when the input size exceeds 2G or close to it.
-class RepeatedInputStream : public io::ZeroCopyInputStream {
- public:
-  RepeatedInputStream(const string& data, size_t count)
-      : data_(data), count_(count), position_(0), total_byte_count_(0) {}
-
-  virtual bool Next(const void** data, int* size) {
-    if (position_ == data_.size()) {
-      if (--count_ == 0) {
-        return false;
-      }
-      position_ = 0;
-    }
-    *data = &data_[position_];
-    *size = static_cast<int>(data_.size() - position_);
-    position_ = data_.size();
-    total_byte_count_ += *size;
-    return true;
-  }
-
-  virtual void BackUp(int count) {
-    position_ -= static_cast<size_t>(count);
-    total_byte_count_ -= count;
-  }
-
-  virtual bool Skip(int count) {
-    while (count > 0) {
-      const void* data;
-      int size;
-      if (!Next(&data, &size)) {
-        break;
-      }
-      if (size >= count) {
-        BackUp(size - count);
-        return true;
-      } else {
-        count -= size;
-      }
-    }
-    return false;
-  }
-
-  virtual int64 ByteCount() const { return total_byte_count_; }
-
- private:
-  string data_;
-  size_t count_;     // The number of strings that haven't been consuemd.
-  size_t position_;  // Position in the string for the next read.
-  int64 total_byte_count_;
-};
-}  // namespace
-
-TEST(MessageTest, TestParseMessagesCloseTo2G) {
-  // Create a message with a large string field.
-  string value = string(64 * 1024 * 1024, 'x');
-  protobuf_unittest::TestAllTypes message;
-  message.set_optional_string(value);
-
-  // Repeat this message in the input stream to make the total input size
-  // close to 2G.
-  string data = message.SerializeAsString();
-  size_t count = static_cast<size_t>(kint32max) / data.size();
-  RepeatedInputStream input(data, count);
-
-  // The parsing should succeed.
-  protobuf_unittest::TestAllTypes result;
-  EXPECT_TRUE(result.ParseFromZeroCopyStream(&input));
-
-  // When there are multiple occurences of a singulr field, the last one
-  // should win.
-  EXPECT_EQ(value, result.optional_string());
-}
-
-TEST(MessageTest, TestParseMessagesOver2G) {
-  // Create a message with a large string field.
-  string value = string(64 * 1024 * 1024, 'x');
-  protobuf_unittest::TestAllTypes message;
-  message.set_optional_string(value);
-
-  // Repeat this message in the input stream to make the total input size
-  // larger than 2G.
-  string data = message.SerializeAsString();
-  size_t count = static_cast<size_t>(kint32max) / data.size() + 1;
-  RepeatedInputStream input(data, count);
-
-  // The parsing should fail.
-  protobuf_unittest::TestAllTypes result;
-  EXPECT_FALSE(result.ParseFromZeroCopyStream(&input));
-}
-
-TEST(MessageTest, BypassInitializationCheckOnSerialize) {
-  unittest::TestRequired message;
-  io::ArrayOutputStream raw_output(NULL, 0);
-  io::CodedOutputStream output(&raw_output);
-  EXPECT_TRUE(message.SerializePartialToCodedStream(&output));
-}
-
-TEST(MessageTest, FindInitializationErrors) {
-  unittest::TestRequired message;
-  std::vector<string> errors;
-  message.FindInitializationErrors(&errors);
-  ASSERT_EQ(3, errors.size());
-  EXPECT_EQ("a", errors[0]);
-  EXPECT_EQ("b", errors[1]);
-  EXPECT_EQ("c", errors[2]);
-}
-
-TEST(MessageTest, ParseFailsOnInvalidMessageEnd) {
-  unittest::TestAllTypes message;
-
-  // Control case.
-  EXPECT_TRUE(message.ParseFromArray("", 0));
-
-  // The byte is a valid varint, but not a valid tag (zero).
-  EXPECT_FALSE(message.ParseFromArray("\0", 1));
-
-  // The byte is a malformed varint.
-  EXPECT_FALSE(message.ParseFromArray("\200", 1));
-
-  // The byte is an endgroup tag, but we aren't parsing a group.
-  EXPECT_FALSE(message.ParseFromArray("\014", 1));
-}
-
-// Regression test for b/23630858
-TEST(MessageTest, MessageIsStillValidAfterParseFails) {
-  unittest::TestAllTypes message;
-
-  // 9 0xFFs for the "optional_uint64" field.
-  string invalid_data = "\x20\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF";
-
-  EXPECT_FALSE(message.ParseFromString(invalid_data));
-  message.Clear();
-  EXPECT_EQ(0, message.optional_uint64());
-}
-
-namespace {
-
-void ExpectMessageMerged(const unittest::TestAllTypes& message) {
-  EXPECT_EQ(3, message.optional_int32());
-  EXPECT_EQ(2, message.optional_int64());
-  EXPECT_EQ("hello", message.optional_string());
-}
-
-void AssignParsingMergeMessages(
-    unittest::TestAllTypes* msg1,
-    unittest::TestAllTypes* msg2,
-    unittest::TestAllTypes* msg3) {
-  msg1->set_optional_int32(1);
-  msg2->set_optional_int64(2);
-  msg3->set_optional_int32(3);
-  msg3->set_optional_string("hello");
-}
-
-}  // namespace
-
-// Test that if an optional or required message/group field appears multiple
-// times in the input, they need to be merged.
-TEST(MessageTest, ParsingMerge) {
-  unittest::TestParsingMerge::RepeatedFieldsGenerator generator;
-  unittest::TestAllTypes* msg1;
-  unittest::TestAllTypes* msg2;
-  unittest::TestAllTypes* msg3;
-
-#define ASSIGN_REPEATED_FIELD(FIELD)                \
-  msg1 = generator.add_##FIELD();                   \
-  msg2 = generator.add_##FIELD();                   \
-  msg3 = generator.add_##FIELD();                   \
-  AssignParsingMergeMessages(msg1, msg2, msg3)
-
-  ASSIGN_REPEATED_FIELD(field1);
-  ASSIGN_REPEATED_FIELD(field2);
-  ASSIGN_REPEATED_FIELD(field3);
-  ASSIGN_REPEATED_FIELD(ext1);
-  ASSIGN_REPEATED_FIELD(ext2);
-
-#undef ASSIGN_REPEATED_FIELD
-#define ASSIGN_REPEATED_GROUP(FIELD)                \
-  msg1 = generator.add_##FIELD()->mutable_field1(); \
-  msg2 = generator.add_##FIELD()->mutable_field1(); \
-  msg3 = generator.add_##FIELD()->mutable_field1(); \
-  AssignParsingMergeMessages(msg1, msg2, msg3)
-
-  ASSIGN_REPEATED_GROUP(group1);
-  ASSIGN_REPEATED_GROUP(group2);
-
-#undef ASSIGN_REPEATED_GROUP
-
-  string buffer;
-  generator.SerializeToString(&buffer);
-  unittest::TestParsingMerge parsing_merge;
-  parsing_merge.ParseFromString(buffer);
-
-  // Required and optional fields should be merged.
-  ExpectMessageMerged(parsing_merge.required_all_types());
-  ExpectMessageMerged(parsing_merge.optional_all_types());
-  ExpectMessageMerged(
-      parsing_merge.optionalgroup().optional_group_all_types());
-  ExpectMessageMerged(
-      parsing_merge.GetExtension(unittest::TestParsingMerge::optional_ext));
-
-  // Repeated fields should not be merged.
-  EXPECT_EQ(3, parsing_merge.repeated_all_types_size());
-  EXPECT_EQ(3, parsing_merge.repeatedgroup_size());
-  EXPECT_EQ(3, parsing_merge.ExtensionSize(
-      unittest::TestParsingMerge::repeated_ext));
-}
-
-TEST(MessageTest, MergeFrom) {
-  unittest::TestAllTypes source;
-  unittest::TestAllTypes dest;
-
-  // Optional fields
-  source.set_optional_int32(1);  // only source
-  source.set_optional_int64(2);  // both source and dest
-  dest.set_optional_int64(3);
-  dest.set_optional_uint32(4);   // only dest
-
-  // Optional fields with defaults
-  source.set_default_int32(13);  // only source
-  source.set_default_int64(14);  // both source and dest
-  dest.set_default_int64(15);
-  dest.set_default_uint32(16);   // only dest
-
-  // Repeated fields
-  source.add_repeated_int32(5);  // only source
-  source.add_repeated_int32(6);
-  source.add_repeated_int64(7);  // both source and dest
-  source.add_repeated_int64(8);
-  dest.add_repeated_int64(9);
-  dest.add_repeated_int64(10);
-  dest.add_repeated_uint32(11);  // only dest
-  dest.add_repeated_uint32(12);
-
-  dest.MergeFrom(source);
-
-  // Optional fields: source overwrites dest if source is specified
-  EXPECT_EQ(1, dest.optional_int32());  // only source: use source
-  EXPECT_EQ(2, dest.optional_int64());  // source and dest: use source
-  EXPECT_EQ(4, dest.optional_uint32());  // only dest: use dest
-  EXPECT_EQ(0, dest.optional_uint64());  // neither: use default
-
-  // Optional fields with defaults
-  EXPECT_EQ(13, dest.default_int32());  // only source: use source
-  EXPECT_EQ(14, dest.default_int64());  // source and dest: use source
-  EXPECT_EQ(16, dest.default_uint32());  // only dest: use dest
-  EXPECT_EQ(44, dest.default_uint64());  // neither: use default
-
-  // Repeated fields: concatenate source onto the end of dest
-  ASSERT_EQ(2, dest.repeated_int32_size());
-  EXPECT_EQ(5, dest.repeated_int32(0));
-  EXPECT_EQ(6, dest.repeated_int32(1));
-  ASSERT_EQ(4, dest.repeated_int64_size());
-  EXPECT_EQ(9,  dest.repeated_int64(0));
-  EXPECT_EQ(10, dest.repeated_int64(1));
-  EXPECT_EQ(7,  dest.repeated_int64(2));
-  EXPECT_EQ(8,  dest.repeated_int64(3));
-  ASSERT_EQ(2, dest.repeated_uint32_size());
-  EXPECT_EQ(11, dest.repeated_uint32(0));
-  EXPECT_EQ(12, dest.repeated_uint32(1));
-  ASSERT_EQ(0, dest.repeated_uint64_size());
-}
-
-TEST(MessageFactoryTest, GeneratedFactoryLookup) {
-  EXPECT_EQ(
-    MessageFactory::generated_factory()->GetPrototype(
-      protobuf_unittest::TestAllTypes::descriptor()),
-    &protobuf_unittest::TestAllTypes::default_instance());
-}
-
-TEST(MessageFactoryTest, GeneratedFactoryUnknownType) {
-  // Construct a new descriptor.
-  DescriptorPool pool;
-  FileDescriptorProto file;
-  file.set_name("foo.proto");
-  file.add_message_type()->set_name("Foo");
-  const Descriptor* descriptor = pool.BuildFile(file)->message_type(0);
-
-  // Trying to construct it should return NULL.
-  EXPECT_TRUE(
-    MessageFactory::generated_factory()->GetPrototype(descriptor) == NULL);
-}
-
-
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/message_unittest.inc b/src/google/protobuf/message_unittest.inc
new file mode 100644
index 00000000..6ffdcce0
--- /dev/null
+++ b/src/google/protobuf/message_unittest.inc
@@ -0,0 +1,577 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// This file needs to be included as .inc as it depends on certain macros being
+// defined prior to its inclusion.
+
+#include <google/protobuf/message.h>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#ifndef _MSC_VER
+#include <unistd.h>
+#endif
+#include <fstream>
+#include <sstream>
+
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/generated_message_reflection.h>
+
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+#include <google/protobuf/stubs/io_win32.h>
+
+namespace google {
+namespace protobuf {
+
+#if defined(_WIN32)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::close;
+using google::protobuf::internal::win32::open;
+#endif
+
+#ifndef O_BINARY
+#ifdef _O_BINARY
+#define O_BINARY _O_BINARY
+#else
+#define O_BINARY 0  // If this isn't defined, the platform doesn't need it.
+#endif
+#endif
+
+TEST(MESSAGE_TEST_NAME, SerializeHelpers) {
+  // TODO(kenton):  Test more helpers?  They're all two-liners so it seems
+  //   like a waste of time.
+
+  UNITTEST::TestAllTypes message;
+  TestUtil::SetAllFields(&message);
+  std::stringstream stream;
+
+  string str1("foo");
+  string str2("bar");
+
+  EXPECT_TRUE(message.SerializeToString(&str1));
+  EXPECT_TRUE(message.AppendToString(&str2));
+  EXPECT_TRUE(message.SerializeToOstream(&stream));
+
+  EXPECT_EQ(str1.size() + 3, str2.size());
+  EXPECT_EQ("bar", str2.substr(0, 3));
+  // Don't use EXPECT_EQ because we don't want to dump raw binary data to
+  // stdout.
+  EXPECT_TRUE(str2.substr(3) == str1);
+
+  // GCC gives some sort of error if we try to just do stream.str() == str1.
+  string temp = stream.str();
+  EXPECT_TRUE(temp == str1);
+
+  EXPECT_TRUE(message.SerializeAsString() == str1);
+
+}
+
+TEST(MESSAGE_TEST_NAME, SerializeToBrokenOstream) {
+  std::ofstream out;
+  UNITTEST::TestAllTypes message;
+  message.set_optional_int32(123);
+
+  EXPECT_FALSE(message.SerializeToOstream(&out));
+}
+
+TEST(MESSAGE_TEST_NAME, ParseFromFileDescriptor) {
+  string filename = TestSourceDir() +
+                    "/google/protobuf/testdata/golden_message";
+  int file = open(filename.c_str(), O_RDONLY | O_BINARY);
+  ASSERT_GE(file, 0);
+
+  UNITTEST::TestAllTypes message;
+  EXPECT_TRUE(message.ParseFromFileDescriptor(file));
+  TestUtil::ExpectAllFieldsSet(message);
+
+  EXPECT_GE(close(file), 0);
+}
+
+TEST(MESSAGE_TEST_NAME, ParsePackedFromFileDescriptor) {
+  string filename =
+      TestSourceDir() +
+      "/google/protobuf/testdata/golden_packed_fields_message";
+  int file = open(filename.c_str(), O_RDONLY | O_BINARY);
+  ASSERT_GE(file, 0);
+
+  UNITTEST::TestPackedTypes message;
+  EXPECT_TRUE(message.ParseFromFileDescriptor(file));
+  TestUtil::ExpectPackedFieldsSet(message);
+
+  EXPECT_GE(close(file), 0);
+}
+
+TEST(MESSAGE_TEST_NAME, ParseHelpers) {
+  // TODO(kenton):  Test more helpers?  They're all two-liners so it seems
+  //   like a waste of time.
+  string data;
+
+  {
+    // Set up.
+    UNITTEST::TestAllTypes message;
+    TestUtil::SetAllFields(&message);
+    message.SerializeToString(&data);
+  }
+
+  {
+    // Test ParseFromString.
+    UNITTEST::TestAllTypes message;
+    EXPECT_TRUE(message.ParseFromString(data));
+    TestUtil::ExpectAllFieldsSet(message);
+  }
+
+  {
+    // Test ParseFromIstream.
+    UNITTEST::TestAllTypes message;
+    std::stringstream stream(data);
+    EXPECT_TRUE(message.ParseFromIstream(&stream));
+    EXPECT_TRUE(stream.eof());
+    TestUtil::ExpectAllFieldsSet(message);
+  }
+
+  {
+    // Test ParseFromBoundedZeroCopyStream.
+    string data_with_junk(data);
+    data_with_junk.append("some junk on the end");
+    io::ArrayInputStream stream(data_with_junk.data(), data_with_junk.size());
+    UNITTEST::TestAllTypes message;
+    EXPECT_TRUE(message.ParseFromBoundedZeroCopyStream(&stream, data.size()));
+    TestUtil::ExpectAllFieldsSet(message);
+  }
+
+  {
+    // Test that ParseFromBoundedZeroCopyStream fails (but doesn't crash) if
+    // EOF is reached before the expected number of bytes.
+    io::ArrayInputStream stream(data.data(), data.size());
+    UNITTEST::TestAllTypes message;
+    EXPECT_FALSE(
+        message.ParseFromBoundedZeroCopyStream(&stream, data.size() + 1));
+  }
+}
+
+TEST(MESSAGE_TEST_NAME, ParseFailsIfNotInitialized) {
+  UNITTEST::TestRequired message;
+  std::vector<string> errors;
+
+  {
+    ScopedMemoryLog log;
+    EXPECT_FALSE(message.ParseFromString(""));
+    errors = log.GetMessages(ERROR);
+  }
+
+  ASSERT_EQ(1, errors.size());
+  EXPECT_EQ(
+      "Can't parse message of type \"" + string(UNITTEST_PACKAGE_NAME) +
+          ".TestRequired\" because it is missing required fields: a, b, c",
+      errors[0]);
+}
+
+TEST(MESSAGE_TEST_NAME, BypassInitializationCheckOnParse) {
+  UNITTEST::TestRequired message;
+  io::ArrayInputStream raw_input(nullptr, 0);
+  io::CodedInputStream input(&raw_input);
+  EXPECT_TRUE(message.MergePartialFromCodedStream(&input));
+}
+
+TEST(MESSAGE_TEST_NAME, InitializationErrorString) {
+  UNITTEST::TestRequired message;
+  EXPECT_EQ("a, b, c", message.InitializationErrorString());
+}
+
+TEST(MESSAGE_TEST_NAME, DynamicCastToGenerated) {
+  UNITTEST::TestAllTypes test_all_types;
+
+  google::protobuf::Message* test_all_types_pointer = &test_all_types;
+  EXPECT_EQ(&test_all_types,
+            google::protobuf::internal::DynamicCastToGenerated<UNITTEST::TestAllTypes>(
+                test_all_types_pointer));
+  EXPECT_EQ(nullptr,
+            google::protobuf::internal::DynamicCastToGenerated<UNITTEST::TestRequired>(
+                test_all_types_pointer));
+
+  const google::protobuf::Message* test_all_types_pointer_const = &test_all_types;
+  EXPECT_EQ(
+      &test_all_types,
+      google::protobuf::internal::DynamicCastToGenerated<const UNITTEST::TestAllTypes>(
+          test_all_types_pointer_const));
+  EXPECT_EQ(
+      nullptr,
+      google::protobuf::internal::DynamicCastToGenerated<const UNITTEST::TestRequired>(
+          test_all_types_pointer_const));
+}
+
+#ifdef PROTOBUF_HAS_DEATH_TEST  // death tests do not work on Windows yet.
+
+TEST(MESSAGE_TEST_NAME, SerializeFailsIfNotInitialized) {
+  UNITTEST::TestRequired message;
+  string data;
+  EXPECT_DEBUG_DEATH(EXPECT_TRUE(message.SerializeToString(&data)),
+                     "Can't serialize message of type \"" +
+                         string(UNITTEST_PACKAGE_NAME) +
+                         ".TestRequired\" because "
+                         "it is missing required fields: a, b, c");
+}
+
+TEST(MESSAGE_TEST_NAME, CheckInitialized) {
+  UNITTEST::TestRequired message;
+  EXPECT_DEATH(message.CheckInitialized(),
+               "Message of type \"" +
+                   string(UNITTEST_PACKAGE_NAME) +
+                   ".TestRequired\" is missing required "
+                   "fields: a, b, c");
+}
+
+#endif  // PROTOBUF_HAS_DEATH_TEST
+
+namespace {
+// An input stream that repeats a string's content for a number of times. It
+// helps us create a really large input without consuming too much memory. Used
+// to test the parsing behavior when the input size exceeds 2G or close to it.
+class RepeatedInputStream : public io::ZeroCopyInputStream {
+ public:
+  RepeatedInputStream(const string& data, size_t count)
+      : data_(data), count_(count), position_(0), total_byte_count_(0) {}
+
+  virtual bool Next(const void** data, int* size) {
+    if (position_ == data_.size()) {
+      if (--count_ == 0) {
+        return false;
+      }
+      position_ = 0;
+    }
+    *data = &data_[position_];
+    *size = static_cast<int>(data_.size() - position_);
+    position_ = data_.size();
+    total_byte_count_ += *size;
+    return true;
+  }
+
+  virtual void BackUp(int count) {
+    position_ -= static_cast<size_t>(count);
+    total_byte_count_ -= count;
+  }
+
+  virtual bool Skip(int count) {
+    while (count > 0) {
+      const void* data;
+      int size;
+      if (!Next(&data, &size)) {
+        break;
+      }
+      if (size >= count) {
+        BackUp(size - count);
+        return true;
+      } else {
+        count -= size;
+      }
+    }
+    return false;
+  }
+
+  virtual int64 ByteCount() const { return total_byte_count_; }
+
+ private:
+  string data_;
+  size_t count_;     // The number of strings that haven't been consuemd.
+  size_t position_;  // Position in the string for the next read.
+  int64 total_byte_count_;
+};
+}  // namespace
+
+TEST(MESSAGE_TEST_NAME, TestParseMessagesCloseTo2G) {
+  // Create a message with a large string field.
+  string value = string(64 * 1024 * 1024, 'x');
+  UNITTEST::TestAllTypes message;
+  message.set_optional_string(value);
+
+  // Repeat this message in the input stream to make the total input size
+  // close to 2G.
+  string data = message.SerializeAsString();
+  size_t count = static_cast<size_t>(kint32max) / data.size();
+  RepeatedInputStream input(data, count);
+
+  // The parsing should succeed.
+  UNITTEST::TestAllTypes result;
+  EXPECT_TRUE(result.ParseFromZeroCopyStream(&input));
+
+  // When there are multiple occurences of a singulr field, the last one
+  // should win.
+  EXPECT_EQ(value, result.optional_string());
+}
+
+TEST(MESSAGE_TEST_NAME, TestParseMessagesOver2G) {
+  // Create a message with a large string field.
+  string value = string(64 * 1024 * 1024, 'x');
+  UNITTEST::TestAllTypes message;
+  message.set_optional_string(value);
+
+  // Repeat this message in the input stream to make the total input size
+  // larger than 2G.
+  string data = message.SerializeAsString();
+  size_t count = static_cast<size_t>(kint32max) / data.size() + 1;
+  RepeatedInputStream input(data, count);
+
+  // The parsing should fail.
+  UNITTEST::TestAllTypes result;
+  EXPECT_FALSE(result.ParseFromZeroCopyStream(&input));
+}
+
+TEST(MESSAGE_TEST_NAME, BypassInitializationCheckOnSerialize) {
+  UNITTEST::TestRequired message;
+  io::ArrayOutputStream raw_output(nullptr, 0);
+  io::CodedOutputStream output(&raw_output);
+  EXPECT_TRUE(message.SerializePartialToCodedStream(&output));
+}
+
+TEST(MESSAGE_TEST_NAME, FindInitializationErrors) {
+  UNITTEST::TestRequired message;
+  std::vector<string> errors;
+  message.FindInitializationErrors(&errors);
+  ASSERT_EQ(3, errors.size());
+  EXPECT_EQ("a", errors[0]);
+  EXPECT_EQ("b", errors[1]);
+  EXPECT_EQ("c", errors[2]);
+}
+
+TEST(MESSAGE_TEST_NAME, ParseFailsOnInvalidMessageEnd) {
+  UNITTEST::TestAllTypes message;
+
+  // Control case.
+  EXPECT_TRUE(message.ParseFromArray("", 0));
+
+  // The byte is a valid varint, but not a valid tag (zero).
+  EXPECT_FALSE(message.ParseFromArray("\0", 1));
+
+  // The byte is a malformed varint.
+  EXPECT_FALSE(message.ParseFromArray("\200", 1));
+
+  // The byte is an endgroup tag, but we aren't parsing a group.
+  EXPECT_FALSE(message.ParseFromArray("\014", 1));
+}
+
+// Regression test for b/23630858
+TEST(MESSAGE_TEST_NAME, MessageIsStillValidAfterParseFails) {
+  UNITTEST::TestAllTypes message;
+
+  // 9 0xFFs for the "optional_uint64" field.
+  string invalid_data = "\x20\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF";
+
+  EXPECT_FALSE(message.ParseFromString(invalid_data));
+  message.Clear();
+  EXPECT_EQ(0, message.optional_uint64());
+
+  // invalid data for field "optional_string". Length prefix is 1 but no
+  // payload.
+  string invalid_string_data = "\x72\x01";
+  {
+    google::protobuf::Arena arena;
+    UNITTEST::TestAllTypes* arena_message =
+        google::protobuf::Arena::CreateMessage<UNITTEST::TestAllTypes>(&arena);
+    EXPECT_FALSE(arena_message->ParseFromString(invalid_string_data));
+    arena_message->Clear();
+    EXPECT_EQ("", arena_message->optional_string());
+  }
+}
+
+
+namespace {
+
+void ExpectMessageMerged(const UNITTEST::TestAllTypes& message) {
+  EXPECT_EQ(3, message.optional_int32());
+  EXPECT_EQ(2, message.optional_int64());
+  EXPECT_EQ("hello", message.optional_string());
+}
+
+void AssignParsingMergeMessages(UNITTEST::TestAllTypes* msg1,
+                                UNITTEST::TestAllTypes* msg2,
+                                UNITTEST::TestAllTypes* msg3) {
+  msg1->set_optional_int32(1);
+  msg2->set_optional_int64(2);
+  msg3->set_optional_int32(3);
+  msg3->set_optional_string("hello");
+}
+
+}  // namespace
+
+// Test that if an optional or required message/group field appears multiple
+// times in the input, they need to be merged.
+TEST(MESSAGE_TEST_NAME, ParsingMerge) {
+  UNITTEST::TestParsingMerge::RepeatedFieldsGenerator generator;
+  UNITTEST::TestAllTypes* msg1;
+  UNITTEST::TestAllTypes* msg2;
+  UNITTEST::TestAllTypes* msg3;
+
+#define ASSIGN_REPEATED_FIELD(FIELD) \
+  msg1 = generator.add_##FIELD();    \
+  msg2 = generator.add_##FIELD();    \
+  msg3 = generator.add_##FIELD();    \
+  AssignParsingMergeMessages(msg1, msg2, msg3)
+
+  ASSIGN_REPEATED_FIELD(field1);
+  ASSIGN_REPEATED_FIELD(field2);
+  ASSIGN_REPEATED_FIELD(field3);
+  ASSIGN_REPEATED_FIELD(ext1);
+  ASSIGN_REPEATED_FIELD(ext2);
+
+#undef ASSIGN_REPEATED_FIELD
+#define ASSIGN_REPEATED_GROUP(FIELD)                \
+  msg1 = generator.add_##FIELD()->mutable_field1(); \
+  msg2 = generator.add_##FIELD()->mutable_field1(); \
+  msg3 = generator.add_##FIELD()->mutable_field1(); \
+  AssignParsingMergeMessages(msg1, msg2, msg3)
+
+  ASSIGN_REPEATED_GROUP(group1);
+  ASSIGN_REPEATED_GROUP(group2);
+
+#undef ASSIGN_REPEATED_GROUP
+
+  string buffer;
+  generator.SerializeToString(&buffer);
+  UNITTEST::TestParsingMerge parsing_merge;
+  parsing_merge.ParseFromString(buffer);
+
+  // Required and optional fields should be merged.
+  ExpectMessageMerged(parsing_merge.required_all_types());
+  ExpectMessageMerged(parsing_merge.optional_all_types());
+  ExpectMessageMerged(parsing_merge.optionalgroup().optional_group_all_types());
+  ExpectMessageMerged(
+      parsing_merge.GetExtension(UNITTEST::TestParsingMerge::optional_ext));
+
+  // Repeated fields should not be merged.
+  EXPECT_EQ(3, parsing_merge.repeated_all_types_size());
+  EXPECT_EQ(3, parsing_merge.repeatedgroup_size());
+  EXPECT_EQ(
+      3, parsing_merge.ExtensionSize(UNITTEST::TestParsingMerge::repeated_ext));
+}
+
+TEST(MESSAGE_TEST_NAME, MergeFrom) {
+  UNITTEST::TestAllTypes source, dest;
+
+  // Optional fields
+  source.set_optional_int32(1);  // only source
+  source.set_optional_int64(2);  // both source and dest
+  dest.set_optional_int64(3);
+  dest.set_optional_uint32(4);  // only dest
+
+  // Optional fields with defaults
+  source.set_default_int32(13);  // only source
+  source.set_default_int64(14);  // both source and dest
+  dest.set_default_int64(15);
+  dest.set_default_uint32(16);  // only dest
+
+  // Repeated fields
+  source.add_repeated_int32(5);  // only source
+  source.add_repeated_int32(6);
+  source.add_repeated_int64(7);  // both source and dest
+  source.add_repeated_int64(8);
+  dest.add_repeated_int64(9);
+  dest.add_repeated_int64(10);
+  dest.add_repeated_uint32(11);  // only dest
+  dest.add_repeated_uint32(12);
+
+  dest.MergeFrom(source);
+
+  // Optional fields: source overwrites dest if source is specified
+  EXPECT_EQ(1, dest.optional_int32());   // only source: use source
+  EXPECT_EQ(2, dest.optional_int64());   // source and dest: use source
+  EXPECT_EQ(4, dest.optional_uint32());  // only dest: use dest
+  EXPECT_EQ(0, dest.optional_uint64());  // neither: use default
+
+  // Optional fields with defaults
+  EXPECT_EQ(13, dest.default_int32());   // only source: use source
+  EXPECT_EQ(14, dest.default_int64());   // source and dest: use source
+  EXPECT_EQ(16, dest.default_uint32());  // only dest: use dest
+  EXPECT_EQ(44, dest.default_uint64());  // neither: use default
+
+  // Repeated fields: concatenate source onto the end of dest
+  ASSERT_EQ(2, dest.repeated_int32_size());
+  EXPECT_EQ(5, dest.repeated_int32(0));
+  EXPECT_EQ(6, dest.repeated_int32(1));
+  ASSERT_EQ(4, dest.repeated_int64_size());
+  EXPECT_EQ(9, dest.repeated_int64(0));
+  EXPECT_EQ(10, dest.repeated_int64(1));
+  EXPECT_EQ(7, dest.repeated_int64(2));
+  EXPECT_EQ(8, dest.repeated_int64(3));
+  ASSERT_EQ(2, dest.repeated_uint32_size());
+  EXPECT_EQ(11, dest.repeated_uint32(0));
+  EXPECT_EQ(12, dest.repeated_uint32(1));
+  ASSERT_EQ(0, dest.repeated_uint64_size());
+}
+
+TEST(MESSAGE_TEST_NAME, IsInitialized) {
+  UNITTEST::TestIsInitialized msg;
+  EXPECT_TRUE(msg.IsInitialized());
+  UNITTEST::TestIsInitialized::SubMessage* sub_message =
+      msg.mutable_sub_message();
+  EXPECT_TRUE(msg.IsInitialized());
+  UNITTEST::TestIsInitialized::SubMessage::SubGroup* sub_group =
+      sub_message->mutable_subgroup();
+  EXPECT_FALSE(msg.IsInitialized());
+  sub_group->set_i(1);
+  EXPECT_TRUE(msg.IsInitialized());
+}
+
+TEST(MESSAGE_FACTORY_TEST_NAME, GeneratedFactoryLookup) {
+  EXPECT_EQ(MessageFactory::generated_factory()->GetPrototype(
+                UNITTEST::TestAllTypes::descriptor()),
+            &UNITTEST::TestAllTypes::default_instance());
+}
+
+TEST(MESSAGE_FACTORY_TEST_NAME, GeneratedFactoryUnknownType) {
+  // Construct a new descriptor.
+  DescriptorPool pool;
+  FileDescriptorProto file;
+  file.set_name("foo.proto");
+  file.add_message_type()->set_name("Foo");
+  const Descriptor* descriptor = pool.BuildFile(file)->message_type(0);
+
+  // Trying to construct it should return nullptr.
+  EXPECT_TRUE(MessageFactory::generated_factory()->GetPrototype(descriptor) ==
+              nullptr);
+}
+
+
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/metadata.h b/src/google/protobuf/metadata.h
index dca1fa45..0a6507c0 100644
--- a/src/google/protobuf/metadata.h
+++ b/src/google/protobuf/metadata.h
@@ -38,134 +38,13 @@
 #ifndef GOOGLE_PROTOBUF_METADATA_H__
 #define GOOGLE_PROTOBUF_METADATA_H__
 
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/arena.h>
-#include <google/protobuf/arenastring.h>
-#include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/metadata_lite.h>
 #include <google/protobuf/unknown_field_set.h>
 
 namespace google {
 namespace protobuf {
 namespace internal {
 
-// This is the representation for messages that support arena allocation. It
-// uses a tagged pointer to either store the Arena pointer, if there are no
-// unknown fields, or a pointer to a block of memory with both the Arena pointer
-// and the UnknownFieldSet, if there are unknown fields. This optimization
-// allows for "zero-overhead" storage of the Arena pointer, relative to the
-// above baseline implementation.
-//
-// The tagged pointer uses the LSB to disambiguate cases, and uses bit 0 == 0 to
-// indicate an arena pointer and bit 0 == 1 to indicate a UFS+Arena-container
-// pointer.
-template <class T, class Derived>
-class InternalMetadataWithArenaBase {
- public:
-  InternalMetadataWithArenaBase() : ptr_(NULL) {}
-  explicit InternalMetadataWithArenaBase(Arena* arena) : ptr_(arena) {}
-
-  ~InternalMetadataWithArenaBase() {
-    if (have_unknown_fields() && arena() == NULL) {
-      delete PtrValue<Container>();
-    }
-    ptr_ = NULL;
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE const T& unknown_fields() const {
-    if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) {
-      return PtrValue<Container>()->unknown_fields;
-    } else {
-      return Derived::default_instance();
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE T* mutable_unknown_fields() {
-    if (GOOGLE_PREDICT_TRUE(have_unknown_fields())) {
-      return &PtrValue<Container>()->unknown_fields;
-    } else {
-      return mutable_unknown_fields_slow();
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE Arena* arena() const {
-    if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) {
-      return PtrValue<Container>()->arena;
-    } else {
-      return PtrValue<Arena>();
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE bool have_unknown_fields() const {
-    return PtrTag() == kTagContainer;
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Swap(Derived* other) {
-    // Semantics here are that we swap only the unknown fields, not the arena
-    // pointer. We cannot simply swap ptr_ with other->ptr_ because we need to
-    // maintain our own arena ptr. Also, our ptr_ and other's ptr_ may be in
-    // different states (direct arena pointer vs. container with UFS) so we
-    // cannot simply swap ptr_ and then restore the arena pointers. We reuse
-    // UFS's swap implementation instead.
-    if (have_unknown_fields() || other->have_unknown_fields()) {
-      static_cast<Derived*>(this)->DoSwap(other->mutable_unknown_fields());
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void MergeFrom(const Derived& other) {
-    if (other.have_unknown_fields()) {
-      static_cast<Derived*>(this)->DoMergeFrom(other.unknown_fields());
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Clear() {
-    if (have_unknown_fields()) {
-      static_cast<Derived*>(this)->DoClear();
-    }
-  }
-
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void* raw_arena_ptr() const {
-    return ptr_;
-  }
-
- private:
-  void* ptr_;
-
-  // Tagged pointer implementation.
-  enum {
-    // ptr_ is an Arena*.
-    kTagArena = 0,
-    // ptr_ is a Container*.
-    kTagContainer = 1,
-  };
-  static const intptr_t kPtrTagMask = 1;
-  static const intptr_t kPtrValueMask = ~kPtrTagMask;
-
-  // Accessors for pointer tag and pointer value.
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE int PtrTag() const {
-    return reinterpret_cast<intptr_t>(ptr_) & kPtrTagMask;
-  }
-
-  template<typename U> U* PtrValue() const {
-    return reinterpret_cast<U*>(
-        reinterpret_cast<intptr_t>(ptr_) & kPtrValueMask);
-  }
-
-  // If ptr_'s tag is kTagContainer, it points to an instance of this struct.
-  struct Container {
-    T unknown_fields;
-    Arena* arena;
-  };
-
-  GOOGLE_ATTRIBUTE_NOINLINE T* mutable_unknown_fields_slow() {
-    Arena* my_arena = arena();
-    Container* container = Arena::Create<Container>(my_arena);
-    ptr_ = reinterpret_cast<void*>(
-        reinterpret_cast<intptr_t>(container) | kTagContainer);
-    container->arena = my_arena;
-    return &(container->unknown_fields);
-  }
-};
-
 class InternalMetadataWithArena
     : public InternalMetadataWithArenaBase<UnknownFieldSet,
                                            InternalMetadataWithArena> {
@@ -192,36 +71,6 @@ class InternalMetadataWithArena
   }
 };
 
-// We store unknown fields as a string right now, because there is currently no
-// good interface for reading unknown fields into an ArenaString.  We may want
-// to revisit this to allow unknown fields to be parsed onto the Arena.
-class InternalMetadataWithArenaLite
-    : public InternalMetadataWithArenaBase<string,
-                                           InternalMetadataWithArenaLite> {
- public:
-  InternalMetadataWithArenaLite() {}
-
-  explicit InternalMetadataWithArenaLite(Arena* arena)
-      : InternalMetadataWithArenaBase<string,
-                                           InternalMetadataWithArenaLite>(arena) {}
-
-  void DoSwap(string* other) {
-    mutable_unknown_fields()->swap(*other);
-  }
-
-  void DoMergeFrom(const string& other) {
-    mutable_unknown_fields()->append(other);
-  }
-
-  void DoClear() {
-    mutable_unknown_fields()->clear();
-  }
-
-  static const string& default_instance() {
-    return GetEmptyStringAlreadyInited();
-  }
-};
-
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/metadata_lite.h b/src/google/protobuf/metadata_lite.h
new file mode 100644
index 00000000..454d088c
--- /dev/null
+++ b/src/google/protobuf/metadata_lite.h
@@ -0,0 +1,224 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_METADATA_LITE_H__
+#define GOOGLE_PROTOBUF_METADATA_LITE_H__
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/arena.h>
+#include <google/protobuf/message_lite.h>
+#include <google/protobuf/stubs/port.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+// This is the representation for messages that support arena allocation. It
+// uses a tagged pointer to either store the Arena pointer, if there are no
+// unknown fields, or a pointer to a block of memory with both the Arena pointer
+// and the UnknownFieldSet, if there are unknown fields. This optimization
+// allows for "zero-overhead" storage of the Arena pointer, relative to the
+// above baseline implementation.
+//
+// The tagged pointer uses the LSB to disambiguate cases, and uses bit 0 == 0 to
+// indicate an arena pointer and bit 0 == 1 to indicate a UFS+Arena-container
+// pointer.
+template <class T, class Derived>
+class InternalMetadataWithArenaBase {
+ public:
+  InternalMetadataWithArenaBase() : ptr_(NULL) {}
+  explicit InternalMetadataWithArenaBase(Arena* arena) : ptr_(arena) {}
+
+  ~InternalMetadataWithArenaBase() {
+    if (have_unknown_fields() && arena() == NULL) {
+      delete PtrValue<Container>();
+    }
+    ptr_ = NULL;
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE const T& unknown_fields() const {
+    if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) {
+      return PtrValue<Container>()->unknown_fields;
+    } else {
+      return Derived::default_instance();
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE T* mutable_unknown_fields() {
+    if (GOOGLE_PREDICT_TRUE(have_unknown_fields())) {
+      return &PtrValue<Container>()->unknown_fields;
+    } else {
+      return mutable_unknown_fields_slow();
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE Arena* arena() const {
+    if (GOOGLE_PREDICT_FALSE(have_unknown_fields())) {
+      return PtrValue<Container>()->arena;
+    } else {
+      return PtrValue<Arena>();
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE bool have_unknown_fields() const {
+    return PtrTag() == kTagContainer;
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void Swap(Derived* other) {
+    // Semantics here are that we swap only the unknown fields, not the arena
+    // pointer. We cannot simply swap ptr_ with other->ptr_ because we need to
+    // maintain our own arena ptr. Also, our ptr_ and other's ptr_ may be in
+    // different states (direct arena pointer vs. container with UFS) so we
+    // cannot simply swap ptr_ and then restore the arena pointers. We reuse
+    // UFS's swap implementation instead.
+    if (have_unknown_fields() || other->have_unknown_fields()) {
+      static_cast<Derived*>(this)->DoSwap(other->mutable_unknown_fields());
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void MergeFrom(const Derived& other) {
+    if (other.have_unknown_fields()) {
+      static_cast<Derived*>(this)->DoMergeFrom(other.unknown_fields());
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void Clear() {
+    if (have_unknown_fields()) {
+      static_cast<Derived*>(this)->DoClear();
+    }
+  }
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE void* raw_arena_ptr() const {
+    return ptr_;
+  }
+
+ private:
+  void* ptr_;
+
+  // Tagged pointer implementation.
+  enum {
+    // ptr_ is an Arena*.
+    kTagArena = 0,
+    // ptr_ is a Container*.
+    kTagContainer = 1,
+  };
+  static const intptr_t kPtrTagMask = 1;
+  static const intptr_t kPtrValueMask = ~kPtrTagMask;
+
+  // Accessors for pointer tag and pointer value.
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE int PtrTag() const {
+    return reinterpret_cast<intptr_t>(ptr_) & kPtrTagMask;
+  }
+
+  template<typename U> U* PtrValue() const {
+    return reinterpret_cast<U*>(
+        reinterpret_cast<intptr_t>(ptr_) & kPtrValueMask);
+  }
+
+  // If ptr_'s tag is kTagContainer, it points to an instance of this struct.
+  struct Container {
+    T unknown_fields;
+    Arena* arena;
+  };
+
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE T* mutable_unknown_fields_slow() {
+    Arena* my_arena = arena();
+    Container* container = Arena::Create<Container>(my_arena);
+    // Two-step assignment works around a bug in clang's static analyzer:
+    // https://bugs.llvm.org/show_bug.cgi?id=34198.
+    ptr_ = container;
+    ptr_ = reinterpret_cast<void*>(
+        reinterpret_cast<intptr_t>(ptr_) | kTagContainer);
+    container->arena = my_arena;
+    return &(container->unknown_fields);
+  }
+};
+
+// We store unknown fields as a string right now, because there is currently no
+// good interface for reading unknown fields into an ArenaString.  We may want
+// to revisit this to allow unknown fields to be parsed onto the Arena.
+class InternalMetadataWithArenaLite
+    : public InternalMetadataWithArenaBase<string,
+                                           InternalMetadataWithArenaLite> {
+ public:
+  InternalMetadataWithArenaLite() {}
+
+  explicit InternalMetadataWithArenaLite(Arena* arena)
+      : InternalMetadataWithArenaBase<string,
+                                      InternalMetadataWithArenaLite>(arena) {}
+
+  void DoSwap(string* other) {
+    mutable_unknown_fields()->swap(*other);
+  }
+
+  void DoMergeFrom(const string& other) {
+    mutable_unknown_fields()->append(other);
+  }
+
+  void DoClear() {
+    mutable_unknown_fields()->clear();
+  }
+
+  static const string& default_instance() {
+    return GetEmptyStringAlreadyInited();
+  }
+};
+
+// This helper RAII class is needed to efficiently parse unknown fields. We
+// should only call mutable_unknown_fields if there are actual unknown fields.
+// The obvious thing to just use a stack string and swap it at the end of the
+// parse won't work, because the destructor of StringOutputStream needs to be
+// called before we can modify the string (it check-fails). Using
+// LiteUnknownFieldSetter setter(&_internal_metadata_);
+// StringOutputStream stream(setter.buffer());
+// guarantees that the string is only swapped after stream is destroyed.
+class LIBPROTOBUF_EXPORT LiteUnknownFieldSetter {
+ public:
+  explicit LiteUnknownFieldSetter(InternalMetadataWithArenaLite* metadata)
+      : metadata_(metadata) {
+    if (metadata->have_unknown_fields()) {
+      buffer_.swap(*metadata->mutable_unknown_fields());
+    }
+  }
+  ~LiteUnknownFieldSetter() {
+    if (!buffer_.empty()) metadata_->mutable_unknown_fields()->swap(buffer_);
+  }
+  string* buffer() { return &buffer_; }
+
+ private:
+  InternalMetadataWithArenaLite* metadata_;
+  string buffer_;
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_METADATA_LITE_H__
diff --git a/src/google/protobuf/preserve_unknown_enum_test.cc b/src/google/protobuf/preserve_unknown_enum_test.cc
index 1673e8af..e292199e 100644
--- a/src/google/protobuf/preserve_unknown_enum_test.cc
+++ b/src/google/protobuf/preserve_unknown_enum_test.cc
@@ -120,7 +120,7 @@ TEST(PreserveUnknownEnumTest, PreserveParseAndSerializeDynamicMessage) {
   string serialized = orig_message.SerializeAsString();
 
   google::protobuf::DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<google::protobuf::Message> message(factory.GetPrototype(
+  std::unique_ptr<google::protobuf::Message> message(factory.GetPrototype(
       proto3_preserve_unknown_enum_unittest::MyMessage::descriptor())->New());
   EXPECT_EQ(true, message->ParseFromString(serialized));
   message->DiscardUnknownFields();
@@ -161,7 +161,7 @@ TEST(PreserveUnknownEnumTest, DynamicProto2HidesUnknownValues) {
   orig_message.SerializeToString(&serialized);
 
   google::protobuf::DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<google::protobuf::Message> message(factory.GetPrototype(
+  std::unique_ptr<google::protobuf::Message> message(factory.GetPrototype(
       proto2_preserve_unknown_enum_unittest::MyMessage::descriptor())->New());
   EXPECT_EQ(true, message->ParseFromString(serialized));
   // The intermediate message has everything in its "unknown fields".
diff --git a/src/google/protobuf/proto3_arena_lite_unittest.cc b/src/google/protobuf/proto3_arena_lite_unittest.cc
index 0f18c027..2ac775d7 100644
--- a/src/google/protobuf/proto3_arena_lite_unittest.cc
+++ b/src/google/protobuf/proto3_arena_lite_unittest.cc
@@ -30,20 +30,15 @@
 
 #include <string>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
-#include <google/protobuf/test_util.h>
-#include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/unittest_proto3_arena_lite.pb.h>
+#include <google/protobuf/unittest_proto3_arena.pb.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 
 namespace google {
-using proto3_arena_lite_unittest::TestAllTypes;
+using proto3_arena_unittest::TestAllTypes;
 
 namespace protobuf {
 namespace {
@@ -56,9 +51,9 @@ void SetAllFields(TestAllTypes* m) {
   m->mutable_optional_nested_message()->set_bb(42);
   m->mutable_optional_foreign_message()->set_c(43);
   m->set_optional_nested_enum(
-      proto3_arena_lite_unittest::TestAllTypes_NestedEnum_BAZ);
+      proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ);
   m->set_optional_foreign_enum(
-      proto3_arena_lite_unittest::FOREIGN_BAZ);
+      proto3_arena_unittest::FOREIGN_BAZ);
   m->mutable_optional_lazy_message()->set_bb(45);
   m->add_repeated_int32(100);
   m->add_repeated_string("asdf");
@@ -66,9 +61,9 @@ void SetAllFields(TestAllTypes* m) {
   m->add_repeated_nested_message()->set_bb(46);
   m->add_repeated_foreign_message()->set_c(47);
   m->add_repeated_nested_enum(
-      proto3_arena_lite_unittest::TestAllTypes_NestedEnum_BAZ);
+      proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ);
   m->add_repeated_foreign_enum(
-      proto3_arena_lite_unittest::FOREIGN_BAZ);
+      proto3_arena_unittest::FOREIGN_BAZ);
   m->add_repeated_lazy_message()->set_bb(49);
 
   m->set_oneof_uint32(1);
@@ -84,9 +79,9 @@ void ExpectAllFieldsSet(const TestAllTypes& m) {
   EXPECT_EQ(42, m.optional_nested_message().bb());
   EXPECT_EQ(true, m.has_optional_foreign_message());
   EXPECT_EQ(43, m.optional_foreign_message().c());
-  EXPECT_EQ(proto3_arena_lite_unittest::TestAllTypes_NestedEnum_BAZ,
+  EXPECT_EQ(proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ,
             m.optional_nested_enum());
-  EXPECT_EQ(proto3_arena_lite_unittest::FOREIGN_BAZ,
+  EXPECT_EQ(proto3_arena_unittest::FOREIGN_BAZ,
             m.optional_foreign_enum());
   EXPECT_EQ(true, m.has_optional_lazy_message());
   EXPECT_EQ(45, m.optional_lazy_message().bb());
@@ -102,15 +97,15 @@ void ExpectAllFieldsSet(const TestAllTypes& m) {
   EXPECT_EQ(1, m.repeated_foreign_message_size());
   EXPECT_EQ(47, m.repeated_foreign_message(0).c());
   EXPECT_EQ(1, m.repeated_nested_enum_size());
-  EXPECT_EQ(proto3_arena_lite_unittest::TestAllTypes_NestedEnum_BAZ,
+  EXPECT_EQ(proto3_arena_unittest::TestAllTypes_NestedEnum_BAZ,
             m.repeated_nested_enum(0));
   EXPECT_EQ(1, m.repeated_foreign_enum_size());
-  EXPECT_EQ(proto3_arena_lite_unittest::FOREIGN_BAZ,
+  EXPECT_EQ(proto3_arena_unittest::FOREIGN_BAZ,
             m.repeated_foreign_enum(0));
   EXPECT_EQ(1, m.repeated_lazy_message_size());
   EXPECT_EQ(49, m.repeated_lazy_message(0).bb());
 
-  EXPECT_EQ(proto3_arena_lite_unittest::TestAllTypes::kOneofString,
+  EXPECT_EQ(proto3_arena_unittest::TestAllTypes::kOneofString,
             m.oneof_field_case());
   EXPECT_EQ("test", m.oneof_string());
 }
@@ -154,7 +149,7 @@ TEST(Proto3ArenaLiteTest, ReleaseMessage) {
   Arena arena;
   TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
   arena_message->mutable_optional_nested_message()->set_bb(118);
-  google::protobuf::scoped_ptr<TestAllTypes::NestedMessage> nested(
+  std::unique_ptr<TestAllTypes::NestedMessage> nested(
       arena_message->release_optional_nested_message());
   EXPECT_EQ(118, nested->bb());
 }
diff --git a/src/google/protobuf/proto3_arena_unittest.cc b/src/google/protobuf/proto3_arena_unittest.cc
index 2838e0fc..dac73781 100644
--- a/src/google/protobuf/proto3_arena_unittest.cc
+++ b/src/google/protobuf/proto3_arena_unittest.cc
@@ -30,9 +30,6 @@
 
 #include <string>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/test_util.h>
@@ -129,7 +126,8 @@ TEST(Proto3ArenaTest, Parsing) {
   ExpectAllFieldsSet(*arena_message);
 }
 
-TEST(Proto3ArenaTest, UnknownFields) {
+TEST(Proto3ArenaTest, UnknownFieldsDefaultDrop) {
+  ::google::protobuf::internal::SetProto3PreserveUnknownsDefault(false);
   TestAllTypes original;
   SetAllFields(&original);
 
@@ -150,6 +148,28 @@ TEST(Proto3ArenaTest, UnknownFields) {
       arena_message->GetReflection()->GetUnknownFields(*arena_message).empty());
 }
 
+TEST(Proto3ArenaTest, UnknownFieldsDefaultPreserve) {
+  ::google::protobuf::internal::SetProto3PreserveUnknownsDefault(true);
+  TestAllTypes original;
+  SetAllFields(&original);
+
+  Arena arena;
+  TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
+  arena_message->ParseFromString(original.SerializeAsString());
+  ExpectAllFieldsSet(*arena_message);
+
+  // In proto3 we can still get a pointer to the UnknownFieldSet through
+  // reflection API.
+  UnknownFieldSet* unknown_fields =
+      arena_message->GetReflection()->MutableUnknownFields(arena_message);
+  // We can modify this UnknownFieldSet.
+  unknown_fields->AddVarint(1, 2);
+  // And the unknown fields should be changed.
+  ASSERT_NE(original.ByteSize(), arena_message->ByteSize());
+  ASSERT_FALSE(
+      arena_message->GetReflection()->GetUnknownFields(*arena_message).empty());
+}
+
 TEST(Proto3ArenaTest, Swap) {
   Arena arena1;
   Arena arena2;
@@ -175,7 +195,7 @@ TEST(Proto3ArenaTest, ReleaseMessage) {
   Arena arena;
   TestAllTypes* arena_message = Arena::CreateMessage<TestAllTypes>(&arena);
   arena_message->mutable_optional_nested_message()->set_bb(118);
-  google::protobuf::scoped_ptr<TestAllTypes::NestedMessage> nested(
+  std::unique_ptr<TestAllTypes::NestedMessage> nested(
       arena_message->release_optional_nested_message());
   EXPECT_EQ(118, nested->bb());
 }
diff --git a/src/google/protobuf/proto3_lite_unittest.cc b/src/google/protobuf/proto3_lite_unittest.cc
index 2e2beea9..8b2c5742 100644
--- a/src/google/protobuf/proto3_lite_unittest.cc
+++ b/src/google/protobuf/proto3_lite_unittest.cc
@@ -30,13 +30,8 @@
 
 #include <string>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
-#include <google/protobuf/test_util.h>
-#include <google/protobuf/unittest.pb.h>
 #include <google/protobuf/unittest_proto3_lite.pb.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/testing/googletest.h>
diff --git a/src/google/protobuf/reflection.h b/src/google/protobuf/reflection.h
index d5a6653c..5d0fc42b 100755
--- a/src/google/protobuf/reflection.h
+++ b/src/google/protobuf/reflection.h
@@ -34,9 +34,6 @@
 #define GOOGLE_PROTOBUF_REFLECTION_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/message.h>
 #include <google/protobuf/generated_enum_util.h>
@@ -63,7 +60,7 @@ MutableRepeatedFieldRef<T> Reflection::GetMutableRepeatedFieldRef(
 // RepeatedFieldRef definition for non-message types.
 template<typename T>
 class RepeatedFieldRef<
-    T, typename internal::enable_if<!internal::is_base_of<Message, T>::value>::type> {
+    T, typename std::enable_if<!std::is_base_of<Message, T>::value>::type> {
   typedef typename internal::RefTypeTraits<T>::iterator IteratorType;
   typedef typename internal::RefTypeTraits<T>::AccessorType AccessorType;
 
@@ -112,7 +109,7 @@ class RepeatedFieldRef<
 // MutableRepeatedFieldRef definition for non-message types.
 template<typename T>
 class MutableRepeatedFieldRef<
-    T, typename internal::enable_if<!internal::is_base_of<Message, T>::value>::type> {
+    T, typename std::enable_if<!std::is_base_of<Message, T>::value>::type> {
   typedef typename internal::RefTypeTraits<T>::AccessorType AccessorType;
 
  public:
@@ -177,7 +174,7 @@ class MutableRepeatedFieldRef<
 // RepeatedFieldRef definition for message types.
 template<typename T>
 class RepeatedFieldRef<
-    T, typename internal::enable_if<internal::is_base_of<Message, T>::value>::type> {
+    T, typename std::enable_if<std::is_base_of<Message, T>::value>::type> {
   typedef typename internal::RefTypeTraits<T>::iterator IteratorType;
   typedef typename internal::RefTypeTraits<T>::AccessorType AccessorType;
 
@@ -219,7 +216,7 @@ class RepeatedFieldRef<
   }
   iterator end() const {
     // The end iterator must not be dereferenced, no need for scratch space.
-    return iterator(data_, accessor_, false, NULL);
+    return iterator(data_, accessor_, false, nullptr);
   }
 
  private:
@@ -245,7 +242,7 @@ class RepeatedFieldRef<
 // MutableRepeatedFieldRef definition for message types.
 template<typename T>
 class MutableRepeatedFieldRef<
-    T, typename internal::enable_if<internal::is_base_of<Message, T>::value>::type> {
+    T, typename std::enable_if<std::is_base_of<Message, T>::value>::type> {
   typedef typename internal::RefTypeTraits<T>::AccessorType AccessorType;
 
  public:
@@ -447,7 +444,7 @@ class RepeatedFieldRefIterator
         iterator_(begin ? accessor->BeginIterator(data)
                         : accessor->EndIterator(data)),
         // The end iterator must not be dereferenced, no need for scratch space.
-        scratch_space_(begin ? new AccessorValueType : NULL) {}
+        scratch_space_(begin ? new AccessorValueType : nullptr) {}
   // Constructor for message fields.
   RepeatedFieldRefIterator(const void* data,
                            const RepeatedFieldAccessor* accessor,
@@ -508,7 +505,7 @@ class RepeatedFieldRefIterator
   const void* data_;
   const RepeatedFieldAccessor* accessor_;
   void* iterator_;
-  google::protobuf::scoped_ptr<AccessorValueType> scratch_space_;
+  std::unique_ptr<AccessorValueType> scratch_space_;
 };
 
 // TypeTraits that maps the type parameter T of RepeatedFieldRef or
@@ -535,7 +532,7 @@ DEFINE_PRIMITIVE(BOOL, bool)
 
 template<typename T>
 struct RefTypeTraits<
-    T, typename internal::enable_if<PrimitiveTraits<T>::is_primitive>::type> {
+    T, typename std::enable_if<PrimitiveTraits<T>::is_primitive>::type> {
   typedef RepeatedFieldRefIterator<T> iterator;
   typedef RepeatedFieldAccessor AccessorType;
   typedef T AccessorValueType;
@@ -550,7 +547,7 @@ struct RefTypeTraits<
 
 template<typename T>
 struct RefTypeTraits<
-    T, typename internal::enable_if<is_proto_enum<T>::value>::type> {
+    T, typename std::enable_if<is_proto_enum<T>::value>::type> {
   typedef RepeatedFieldRefIterator<T> iterator;
   typedef RepeatedFieldAccessor AccessorType;
   // We use int32 for repeated enums in RepeatedFieldAccessor.
@@ -566,12 +563,12 @@ struct RefTypeTraits<
 
 template<typename T>
 struct RefTypeTraits<
-    T, typename internal::enable_if< ::google::protobuf::internal::is_same<string, T>::value>::type> {
+    T, typename std::enable_if<std::is_same<string, T>::value>::type> {
   typedef RepeatedFieldRefIterator<T> iterator;
   typedef RepeatedFieldAccessor AccessorType;
   typedef string AccessorValueType;
-  typedef string IteratorValueType;
-  typedef string* IteratorPointerType;
+  typedef const string IteratorValueType;
+  typedef const string* IteratorPointerType;
   static const FieldDescriptor::CppType cpp_type =
       FieldDescriptor::CPPTYPE_STRING;
   static const Descriptor* GetMessageFieldDescriptor() {
@@ -594,7 +591,7 @@ struct MessageDescriptorGetter<Message> {
 
 template<typename T>
 struct RefTypeTraits<
-    T, typename internal::enable_if<internal::is_base_of<Message, T>::value>::type> {
+    T, typename std::enable_if<std::is_base_of<Message, T>::value>::type> {
   typedef RepeatedFieldRefIterator<T> iterator;
   typedef RepeatedFieldAccessor AccessorType;
   typedef Message AccessorValueType;
diff --git a/src/google/protobuf/reflection_ops.cc b/src/google/protobuf/reflection_ops.cc
index bb9c7f8b..3cd50340 100644
--- a/src/google/protobuf/reflection_ops.cc
+++ b/src/google/protobuf/reflection_ops.cc
@@ -31,13 +31,16 @@
 // Author: kenton@google.com (Kenton Varda)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
+#include <google/protobuf/reflection_ops.h>
 
 #include <string>
 #include <vector>
 
-#include <google/protobuf/reflection_ops.h>
-#include <google/protobuf/descriptor.h>
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
 #include <google/protobuf/descriptor.pb.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/map_field.h>
 #include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/stubs/strutil.h>
 
@@ -45,6 +48,17 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
+static const Reflection* GetReflectionOrDie(const Message& m) {
+  const Reflection* r = m.GetReflection();
+  if (r == nullptr) {
+    const Descriptor* d = m.GetDescriptor();
+    const string& mtype = d ? d->name() : "unknown";
+    // RawMessage is one known type for which GetReflection() returns nullptr.
+    GOOGLE_LOG(FATAL) << "Message does not support reflection (type " << mtype << ").";
+  }
+  return r;
+}
+
 void ReflectionOps::Copy(const Message& from, Message* to) {
   if (&from == to) return;
   Clear(to);
@@ -60,8 +74,8 @@ void ReflectionOps::Merge(const Message& from, Message* to) {
     << "(merge " << descriptor->full_name()
     << " to " << to->GetDescriptor()->full_name() << ")";
 
-  const Reflection* from_reflection = from.GetReflection();
-  const Reflection* to_reflection = to->GetReflection();
+  const Reflection* from_reflection = GetReflectionOrDie(from);
+  const Reflection* to_reflection = GetReflectionOrDie(*to);
 
   std::vector<const FieldDescriptor*> fields;
   from_reflection->ListFields(from, &fields);
@@ -127,7 +141,7 @@ void ReflectionOps::Merge(const Message& from, Message* to) {
 }
 
 void ReflectionOps::Clear(Message* message) {
-  const Reflection* reflection = message->GetReflection();
+  const Reflection* reflection = GetReflectionOrDie(*message);
 
   std::vector<const FieldDescriptor*> fields;
   reflection->ListFields(*message, &fields);
@@ -140,7 +154,7 @@ void ReflectionOps::Clear(Message* message) {
 
 bool ReflectionOps::IsInitialized(const Message& message) {
   const Descriptor* descriptor = message.GetDescriptor();
-  const Reflection* reflection = message.GetReflection();
+  const Reflection* reflection = GetReflectionOrDie(message);
 
   // Check required fields of this message.
   for (int i = 0; i < descriptor->field_count(); i++) {
@@ -158,6 +172,27 @@ bool ReflectionOps::IsInitialized(const Message& message) {
     const FieldDescriptor* field = fields[i];
     if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
 
+      if (field->is_map()) {
+        const FieldDescriptor* value_field = field->message_type()->field(1);
+        if (value_field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+          MapFieldBase* map_field =
+              reflection->MapData(const_cast<Message*>(&message), field);
+          if (map_field->IsMapValid()) {
+            MapIterator iter(const_cast<Message*>(&message), field);
+            MapIterator end(const_cast<Message*>(&message), field);
+            for (map_field->MapBegin(&iter), map_field->MapEnd(&end);
+                 iter != end; ++iter) {
+              if (!iter.GetValueRef().GetMessageValue().IsInitialized()) {
+                return false;
+              }
+            }
+            continue;
+          }
+        } else {
+          continue;
+        }
+      }
+
       if (field->is_repeated()) {
         int size = reflection->FieldSize(message, field);
 
@@ -179,7 +214,7 @@ bool ReflectionOps::IsInitialized(const Message& message) {
 }
 
 void ReflectionOps::DiscardUnknownFields(Message* message) {
-  const Reflection* reflection = message->GetReflection();
+  const Reflection* reflection = GetReflectionOrDie(*message);
 
   reflection->MutableUnknownFields(message)->Clear();
 
@@ -226,7 +261,7 @@ void ReflectionOps::FindInitializationErrors(
     const string& prefix,
     std::vector<string>* errors) {
   const Descriptor* descriptor = message.GetDescriptor();
-  const Reflection* reflection = message.GetReflection();
+  const Reflection* reflection = GetReflectionOrDie(message);
 
   // Check required fields of this message.
   for (int i = 0; i < descriptor->field_count(); i++) {
diff --git a/src/google/protobuf/reflection_ops_unittest.cc b/src/google/protobuf/reflection_ops_unittest.cc
index 86453170..9cedb342 100644
--- a/src/google/protobuf/reflection_ops_unittest.cc
+++ b/src/google/protobuf/reflection_ops_unittest.cc
@@ -41,6 +41,7 @@
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
+
 #include <google/protobuf/stubs/strutil.h>
 
 namespace google {
diff --git a/src/google/protobuf/repeated_field.cc b/src/google/protobuf/repeated_field.cc
index 5ca964c1..310000aa 100644
--- a/src/google/protobuf/repeated_field.cc
+++ b/src/google/protobuf/repeated_field.cc
@@ -103,6 +103,22 @@ void RepeatedPtrFieldBase::CloseGap(int start, int num) {
   rep_->allocated_size -= num;
 }
 
+google::protobuf::MessageLite* RepeatedPtrFieldBase::AddWeak(
+    const google::protobuf::MessageLite* prototype) {
+  if (rep_ != NULL && current_size_ < rep_->allocated_size) {
+    return reinterpret_cast<google::protobuf::MessageLite*>(
+        rep_->elements[current_size_++]);
+  }
+  if (!rep_ || rep_->allocated_size == total_size_) {
+    Reserve(total_size_ + 1);
+  }
+  ++rep_->allocated_size;
+  google::protobuf::MessageLite* result = prototype ? prototype->New(arena_) :
+      Arena::CreateMessage<ImplicitWeakMessage>(arena_);
+  rep_->elements[current_size_++] = result;
+  return result;
+}
+
 }  // namespace internal
 
 
diff --git a/src/google/protobuf/repeated_field.h b/src/google/protobuf/repeated_field.h
index db5893b5..b47ea994 100644
--- a/src/google/protobuf/repeated_field.h
+++ b/src/google/protobuf/repeated_field.h
@@ -51,15 +51,17 @@
 #include <algorithm>
 #endif
 
-#include <string>
 #include <iterator>
+#include <limits>
+#include <string>
 #include <google/protobuf/stubs/casts.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/type_traits.h>
 #include <google/protobuf/arena.h>
-#include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/implicit_weak_message.h>
 #include <google/protobuf/message_lite.h>
+#include <google/protobuf/stubs/port.h>
+#include <type_traits>
 
 
 // Forward-declare these so that we can make them friends.
@@ -76,6 +78,8 @@ class Message;
 
 namespace internal {
 
+class MergePartialFromCodedStreamHelper;
+
 static const int kMinRepeatedFieldAllocationSize = 4;
 
 // A utility function for logging that doesn't need any template types.
@@ -83,7 +87,7 @@ void LogIndexOutOfBounds(int index, int size);
 
 template <typename Iter>
 inline int CalculateReserve(Iter begin, Iter end, std::forward_iterator_tag) {
-  return std::distance(begin, end);
+  return static_cast<int>(std::distance(begin, end));
 }
 
 template <typename Iter>
@@ -105,7 +109,7 @@ inline int CalculateReserve(Iter begin, Iter end) {
 // not ever use a RepeatedField directly; they will use the get-by-index,
 // set-by-index, and add accessors that are generated for all repeated fields.
 template <typename Element>
-class RepeatedField PROTOBUF_FINAL {
+class RepeatedField final {
  public:
   RepeatedField();
   explicit RepeatedField(Arena* arena);
@@ -116,6 +120,9 @@ class RepeatedField PROTOBUF_FINAL {
 
   RepeatedField& operator=(const RepeatedField& other);
 
+  RepeatedField(RepeatedField&& other) noexcept;
+  RepeatedField& operator=(RepeatedField&& other) noexcept;
+
   bool empty() const;
   int size() const;
 
@@ -155,6 +162,7 @@ class RepeatedField PROTOBUF_FINAL {
   // The new element is uninitialized if |Element| is a POD type.
   // Should be called only if Capacity() > Size().
   Element* AddAlreadyReserved();
+  Element* AddNAlreadyReserved(int elements);
   int Capacity() const;
 
   // Like STL resize.  Uses value to fill appended elements.
@@ -216,7 +224,11 @@ class RepeatedField PROTOBUF_FINAL {
 
   // Returns the number of bytes used by the repeated field, excluding
   // sizeof(*this)
-  int SpaceUsedExcludingSelf() const;
+  size_t SpaceUsedExcludingSelfLong() const;
+
+  int SpaceUsedExcludingSelf() const {
+    return internal::ToIntSize(SpaceUsedExcludingSelfLong());
+  }
 
   // Removes the element referenced by position.
   //
@@ -238,6 +250,11 @@ class RepeatedField PROTOBUF_FINAL {
     return GetArenaNoVirtual();
   }
 
+  // For internal use only.
+  //
+  // This is public due to it being called by generated code.
+  inline void InternalSwap(RepeatedField* other);
+
  private:
   static const int kInitialSize = 0;
   // A note on the representation here (see also comment below for
@@ -261,13 +278,24 @@ class RepeatedField PROTOBUF_FINAL {
   // a "gap" after the field arena and before the field elements (e.g., when
   // Element is double and pointer is 32bit).
   static const size_t kRepHeaderSize;
-  // Contains arena ptr and the elements array. We also keep the invariant that
-  // if rep_ is NULL, then arena is NULL.
-  Rep* rep_;
+
+  // We reuse the Rep* for an Arena* when total_size == 0, to avoid having to do
+  // an allocation in the constructor when we have an Arena.
+  union Pointer {
+    Pointer(Arena* a) : arena(a) {}
+    Arena* arena;   // When total_size_ == 0.
+    Rep* rep;       // When total_size_ != 0.
+  } ptr_;
+
+  Rep* rep() const {
+    GOOGLE_DCHECK_GT(total_size_, 0);
+    return ptr_.rep;
+  }
 
   friend class Arena;
   typedef void InternalArenaConstructable_;
 
+
   // Move the contents of |from| into |to|, possibly clobbering |from| in the
   // process.  For primitive types this is just a memcpy(), but it could be
   // specialized for non-primitive types to, say, swap each element instead.
@@ -276,11 +304,9 @@ class RepeatedField PROTOBUF_FINAL {
   // Copy the elements of |from| into |to|.
   void CopyArray(Element* to, const Element* from, int size);
 
-  inline void InternalSwap(RepeatedField* other);
-
   // Internal helper expected by Arena methods.
   inline Arena* GetArenaNoVirtual() const {
-    return (rep_ == NULL) ? NULL : rep_->arena;
+    return (total_size_ == 0) ? ptr_.arena : ptr_.rep->arena;
   }
 
   // Internal helper to delete all elements and deallocate the storage.
@@ -291,7 +317,7 @@ class RepeatedField PROTOBUF_FINAL {
       Element* e = &rep->elements[0];
       Element* limit = &rep->elements[size];
       for (; e < limit; e++) {
-        e->Element::~Element();
+        e->~Element();
       }
       if (rep->arena == NULL) {
 #if defined(__GXX_DELETE_WITH_SIZE__) || defined(__cpp_sized_deallocation)
@@ -303,6 +329,9 @@ class RepeatedField PROTOBUF_FINAL {
       }
     }
   }
+
+  friend class internal::WireFormatLite;
+  const Element* unsafe_data() const;
 };
 
 template<typename Element>
@@ -321,7 +350,8 @@ namespace internal {
 // shouldn't be necessary, but our compiler doesn't optimize std::copy very
 // effectively.
 template <typename Element,
-          bool HasTrivialCopy = has_trivial_copy<Element>::value>
+          bool HasTrivialCopy =
+              std::is_pod<Element>::value>
 struct ElementCopier {
   void operator()(Element* to, const Element* from, int array_size);
 };
@@ -335,8 +365,8 @@ namespace internal {
 // exist on the contained type. In particular, we rely on MergeFrom() existing
 // as a general proxy for the fact that a copy will work, and we also provide a
 // specific override for string*.
-template<typename T>
-struct TypeImplementsMergeBehavior {
+template <typename T>
+struct TypeImplementsMergeBehaviorProbeForMergeFrom {
   typedef char HasMerge;
   typedef long HasNoMerge;
 
@@ -355,14 +385,19 @@ struct TypeImplementsMergeBehavior {
       CheckType<U, bool, &U::MergeFrom>*);
   template<typename U> static HasNoMerge Check(...);
 
-  // Resovles to either google::protobuf::internal::true_type or google::protobuf::internal::false_type.
-  typedef google::protobuf::internal::integral_constant<bool,
+  // Resolves to either std::true_type or std::false_type.
+  typedef std::integral_constant<bool,
                (sizeof(Check<T>(0)) == sizeof(HasMerge))> type;
 };
 
-template<>
-struct TypeImplementsMergeBehavior< ::std::string > {
-  typedef google::protobuf::internal::true_type type;
+template <typename T, typename = void>
+struct TypeImplementsMergeBehavior :
+    TypeImplementsMergeBehaviorProbeForMergeFrom<T> {};
+
+
+template <>
+struct TypeImplementsMergeBehavior< ::std::string> {
+  typedef std::true_type type;
 };
 
 // This is the common base class for RepeatedPtrFields.  It deals only in void*
@@ -373,37 +408,21 @@ struct TypeImplementsMergeBehavior< ::std::string > {
 //   class TypeHandler {
 //    public:
 //     typedef MyType Type;
+//     // WeakType is almost always the same as MyType, but we use it in
+//     // ImplicitWeakTypeHandler.
+//     typedef MyType WeakType;
 //     static Type* New();
+//     static WeakType* NewFromPrototype(const WeakType* prototype,
+//                                       ::google::protobuf::Arena* arena);
 //     static void Delete(Type*);
 //     static void Clear(Type*);
 //     static void Merge(const Type& from, Type* to);
 //
 //     // Only needs to be implemented if SpaceUsedExcludingSelf() is called.
-//     static int SpaceUsed(const Type&);
+//     static int SpaceUsedLong(const Type&);
 //   };
 class LIBPROTOBUF_EXPORT RepeatedPtrFieldBase {
  protected:
-  // The reflection implementation needs to call protected methods directly,
-  // reinterpreting pointers as being to Message instead of a specific Message
-  // subclass.
-  friend class GeneratedMessageReflection;
-
-  // ExtensionSet stores repeated message extensions as
-  // RepeatedPtrField<MessageLite>, but non-lite ExtensionSets need to
-  // implement SpaceUsed(), and thus need to call SpaceUsedExcludingSelf()
-  // reinterpreting MessageLite as Message.  ExtensionSet also needs to make
-  // use of AddFromCleared(), which is not part of the public interface.
-  friend class ExtensionSet;
-
-  // The MapFieldBase implementation needs to call protected methods directly,
-  // reinterpreting pointers as being to Message instead of a specific Message
-  // subclass.
-  friend class MapFieldBase;
-
-  // To parse directly into a proto2 generated class, the upb class GMR_Handlers
-  // needs to be able to modify a RepeatedPtrFieldBase directly.
-  friend class upb::google_opensource::GMR_Handlers;
-
   RepeatedPtrFieldBase();
   explicit RepeatedPtrFieldBase(::google::protobuf::Arena* arena);
   ~RepeatedPtrFieldBase() {}
@@ -416,25 +435,41 @@ class LIBPROTOBUF_EXPORT RepeatedPtrFieldBase {
   int size() const;
 
   template <typename TypeHandler>
-  const typename TypeHandler::Type& Get(int index) const;
-  template <typename TypeHandler>
   typename TypeHandler::Type* Mutable(int index);
   template <typename TypeHandler>
   void Delete(int index);
   template <typename TypeHandler>
   typename TypeHandler::Type* Add(typename TypeHandler::Type* prototype = NULL);
-#if LANG_CXX11
-  template <typename TypeHandler>
-  void Add(typename TypeHandler::Type&& value,
-           std::enable_if<TypeHandler::Moveable>* dummy = NULL);
-#endif
+
+ public:
+  // The next few methods are public so that they can be called from generated
+  // code when implicit weak fields are used, but they should never be called by
+  // application code.
 
   template <typename TypeHandler>
-  void RemoveLast();
+  const typename TypeHandler::WeakType& Get(int index) const;
+
+  // Creates and adds an element using the given prototype, without introducing
+  // a link-time dependency on the concrete message type. This method is used to
+  // implement implicit weak fields. The prototype may be NULL, in which case an
+  // ImplicitWeakMessage will be used as a placeholder.
+  google::protobuf::MessageLite* AddWeak(const google::protobuf::MessageLite* prototype);
+
   template <typename TypeHandler>
   void Clear();
+
   template <typename TypeHandler>
   void MergeFrom(const RepeatedPtrFieldBase& other);
+
+  inline void InternalSwap(RepeatedPtrFieldBase* other);
+
+ protected:
+  template <typename TypeHandler>
+  void Add(typename TypeHandler::Type&& value,
+           std::enable_if<TypeHandler::Moveable>* dummy = NULL);
+
+  template <typename TypeHandler>
+  void RemoveLast();
   template <typename TypeHandler>
   void CopyFrom(const RepeatedPtrFieldBase& other);
 
@@ -453,14 +488,13 @@ class LIBPROTOBUF_EXPORT RepeatedPtrFieldBase {
   template <typename TypeHandler>
   const typename TypeHandler::Type* const* data() const;
 
-  template <typename TypeHandler>
-  GOOGLE_ATTRIBUTE_ALWAYS_INLINE void Swap(RepeatedPtrFieldBase* other);
+  template <typename TypeHandler> GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  void Swap(RepeatedPtrFieldBase* other);
 
   void SwapElements(int index1, int index2);
 
   template <typename TypeHandler>
-  int SpaceUsedExcludingSelf() const;
-
+  size_t SpaceUsedExcludingSelfLong() const;
 
   // Advanced memory management --------------------------------------
 
@@ -494,29 +528,24 @@ class LIBPROTOBUF_EXPORT RepeatedPtrFieldBase {
   template <typename TypeHandler>
   typename TypeHandler::Type* ReleaseCleared();
 
- protected:
-  inline void InternalSwap(RepeatedPtrFieldBase* other);
-
   template <typename TypeHandler>
-  void AddAllocatedInternal(typename TypeHandler::Type* value,
-                            google::protobuf::internal::true_type);
+  void AddAllocatedInternal(typename TypeHandler::Type* value, std::true_type);
   template <typename TypeHandler>
-  void AddAllocatedInternal(typename TypeHandler::Type* value,
-                            google::protobuf::internal::false_type);
+  void AddAllocatedInternal(typename TypeHandler::Type* value, std::false_type);
 
-  template <typename TypeHandler> GOOGLE_ATTRIBUTE_NOINLINE
+  template <typename TypeHandler> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
   void AddAllocatedSlowWithCopy(typename TypeHandler::Type* value,
                                 Arena* value_arena,
                                 Arena* my_arena);
-  template <typename TypeHandler> GOOGLE_ATTRIBUTE_NOINLINE
+  template <typename TypeHandler> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
   void AddAllocatedSlowWithoutCopy(typename TypeHandler::Type* value);
 
   template <typename TypeHandler>
-  typename TypeHandler::Type* ReleaseLastInternal(google::protobuf::internal::true_type);
+  typename TypeHandler::Type* ReleaseLastInternal(std::true_type);
   template <typename TypeHandler>
-  typename TypeHandler::Type* ReleaseLastInternal(google::protobuf::internal::false_type);
+  typename TypeHandler::Type* ReleaseLastInternal(std::false_type);
 
-  template<typename TypeHandler> GOOGLE_ATTRIBUTE_NOINLINE
+  template<typename TypeHandler> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
   void SwapFallback(RepeatedPtrFieldBase* other);
 
   inline Arena* GetArenaNoVirtual() const {
@@ -573,6 +602,33 @@ class LIBPROTOBUF_EXPORT RepeatedPtrFieldBase {
   // Reserve() and MergeFrom() to reduce code size. |extend_amount| must be > 0.
   void** InternalExtend(int extend_amount);
 
+  // The reflection implementation needs to call protected methods directly,
+  // reinterpreting pointers as being to Message instead of a specific Message
+  // subclass.
+  friend class GeneratedMessageReflection;
+
+  // ExtensionSet stores repeated message extensions as
+  // RepeatedPtrField<MessageLite>, but non-lite ExtensionSets need to implement
+  // SpaceUsedLong(), and thus need to call SpaceUsedExcludingSelfLong()
+  // reinterpreting MessageLite as Message.  ExtensionSet also needs to make use
+  // of AddFromCleared(), which is not part of the public interface.
+  friend class ExtensionSet;
+
+  // The MapFieldBase implementation needs to call protected methods directly,
+  // reinterpreting pointers as being to Message instead of a specific Message
+  // subclass.
+  friend class MapFieldBase;
+
+  // The table-driven MergePartialFromCodedStream implementation needs to
+  // operate on RepeatedPtrField<MessageLite>.
+  friend class MergePartialFromCodedStreamHelper;
+
+  // To parse directly into a proto2 generated class, the upb class GMR_Handlers
+  // needs to be able to modify a RepeatedPtrFieldBase directly.
+  friend class upb::google_opensource::GMR_Handlers;
+
+  friend class AccessorHelper;
+
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(RepeatedPtrFieldBase);
 };
 
@@ -580,17 +636,13 @@ template <typename GenericType>
 class GenericTypeHandler {
  public:
   typedef GenericType Type;
-#if LANG_CXX11
+  typedef GenericType WeakType;
   static const bool Moveable = false;
-#endif
+
   static inline GenericType* New(Arena* arena) {
-    return ::google::protobuf::Arena::CreateMaybeMessage<Type>(
-        arena, static_cast<GenericType*>(0));
+    return ::google::protobuf::Arena::CreateMaybeMessage<Type>(arena);
   }
-  // We force NewFromPrototype() to be non-inline to reduce code size:
-  // else, several other methods get inlined copies of message types'
-  // constructors.
-  GOOGLE_ATTRIBUTE_NOINLINE static GenericType* NewFromPrototype(
+  static inline GenericType* NewFromPrototype(
       const GenericType* prototype, ::google::protobuf::Arena* arena = NULL);
   static inline void Delete(GenericType* value, Arena* arena) {
     if (arena == NULL) {
@@ -605,13 +657,10 @@ class GenericTypeHandler {
   }
 
   static inline void Clear(GenericType* value) { value->Clear(); }
-  GOOGLE_ATTRIBUTE_NOINLINE static void Merge(const GenericType& from,
-                                       GenericType* to);
-  static inline int SpaceUsed(const GenericType& value) {
-    return value.SpaceUsed();
-  }
-  static inline const Type& default_instance() {
-    return Type::default_instance();
+  GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+  static void Merge(const GenericType& from, GenericType* to);
+  static inline size_t SpaceUsedLong(const GenericType& value) {
+    return value.SpaceUsedLong();
   }
 };
 
@@ -626,11 +675,9 @@ void GenericTypeHandler<GenericType>::Merge(const GenericType& from,
   to->MergeFrom(from);
 }
 
-// NewFromPrototype() and Merge() cannot be defined here; if they're declared
-// inline the compiler will complain about not matching GOOGLE_ATTRIBUTE_NOINLINE
-// above, and if not, compilation will result in multiple definitions.  These
-// are therefore declared as specializations here and defined in
-// message_lite.cc.
+// NewFromPrototype() and Merge() are not defined inline here, as we will need
+// to do a virtual function dispatch anyways to go from Message* to call
+// New/Merge.
 template<>
 MessageLite* GenericTypeHandler<MessageLite>::NewFromPrototype(
     const MessageLite* prototype, google::protobuf::Arena* arena);
@@ -676,42 +723,19 @@ DECLARE_SPECIALIZATIONS_FOR_BASE_PROTO_TYPES(Message)
 
 #undef DECLARE_SPECIALIZATIONS_FOR_BASE_PROTO_TYPES
 
-template <>
-inline const MessageLite& GenericTypeHandler<MessageLite>::default_instance() {
-  // Yes, the behavior of the code is undefined, but this function is only
-  // called when we're already deep into the world of undefined, because the
-  // caller called Get(index) out of bounds.
-  MessageLite* null = NULL;
-  return *null;
-}
-
-template <>
-inline const Message& GenericTypeHandler<Message>::default_instance() {
-  // Yes, the behavior of the code is undefined, but this function is only
-  // called when we're already deep into the world of undefined, because the
-  // caller called Get(index) out of bounds.
-  Message* null = NULL;
-  return *null;
-}
-
-
 class StringTypeHandler {
  public:
   typedef string Type;
-#if LANG_CXX11
-  static const bool Moveable =
-      std::is_move_constructible<Type>::value &&
-      std::is_move_assignable<Type>::value;
-#endif
+  typedef string WeakType;
+  static const bool Moveable = std::is_move_constructible<Type>::value &&
+                               std::is_move_assignable<Type>::value;
 
   static inline string* New(Arena* arena) {
     return Arena::Create<string>(arena);
   }
-#if LANG_CXX11
-  static inline string* New(Arena* arena, std::string&& value) {
+  static inline string* New(Arena* arena, string&& value) {
     return Arena::Create<string>(arena, std::move(value));
   }
-#endif
   static inline string* NewFromPrototype(const string*,
                                          ::google::protobuf::Arena* arena) {
     return New(arena);
@@ -729,21 +753,17 @@ class StringTypeHandler {
   }
   static inline void Clear(string* value) { value->clear(); }
   static inline void Merge(const string& from, string* to) { *to = from; }
-  static inline const Type& default_instance() {
-    return ::google::protobuf::internal::GetEmptyString();
-  }
-  static int SpaceUsed(const string& value)  {
-    return static_cast<int>(sizeof(value)) + StringSpaceUsedExcludingSelf(value);
+  static size_t SpaceUsedLong(const string& value)  {
+    return sizeof(value) + StringSpaceUsedExcludingSelfLong(value);
   }
 };
 
-
 }  // namespace internal
 
 // RepeatedPtrField is like RepeatedField, but used for repeated strings or
 // Messages.
 template <typename Element>
-class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
+class RepeatedPtrField final : private internal::RepeatedPtrFieldBase {
  public:
   RepeatedPtrField();
   explicit RepeatedPtrField(::google::protobuf::Arena* arena);
@@ -755,15 +775,16 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
 
   RepeatedPtrField& operator=(const RepeatedPtrField& other);
 
+  RepeatedPtrField(RepeatedPtrField&& other) noexcept;
+  RepeatedPtrField& operator=(RepeatedPtrField&& other) noexcept;
+
   bool empty() const;
   int size() const;
 
   const Element& Get(int index) const;
   Element* Mutable(int index);
   Element* Add();
-#if LANG_CXX11
   void Add(Element&& value);
-#endif
 
   const Element& operator[](int index) const { return Get(index); }
   Element& operator[](int index) { return *Mutable(index); }
@@ -842,10 +863,11 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
 
   // Custom STL-like iterator that iterates over and returns the underlying
   // pointers to Element rather than Element itself.
-  typedef internal::RepeatedPtrOverPtrsIterator<Element, void*>
-  pointer_iterator;
-  typedef internal::RepeatedPtrOverPtrsIterator<const Element, const void*>
-  const_pointer_iterator;
+  typedef internal::RepeatedPtrOverPtrsIterator<Element*, void*>
+      pointer_iterator;
+  typedef internal::RepeatedPtrOverPtrsIterator<const Element* const,
+                                                const void* const>
+      const_pointer_iterator;
   pointer_iterator pointer_begin();
   const_pointer_iterator pointer_begin() const;
   pointer_iterator pointer_end();
@@ -853,7 +875,11 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
 
   // Returns (an estimate of) the number of bytes used by the repeated field,
   // excluding sizeof(*this).
-  int SpaceUsedExcludingSelf() const;
+  size_t SpaceUsedExcludingSelfLong() const;
+
+  int SpaceUsedExcludingSelf() const {
+    return internal::ToIntSize(SpaceUsedExcludingSelfLong());
+  }
 
   // Advanced memory management --------------------------------------
   // When hardcore memory management becomes necessary -- as it sometimes
@@ -888,7 +914,7 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
   //   RepeatedPtrField<T> temp_field;
   //   temp_field.AddAllocated(new T);
   //   ... // Do something with temp_field
-  //   temp_field.ExtractSubrange(0, temp_field.size(), NULL);
+  //   temp_field.ExtractSubrange(0, temp_field.size(), nullptr);
   // If you put temp_field on the arena this fails, because the ownership
   // transfers to the arena at the "AddAllocated" call and is not released
   // anymore causing a double delete. UnsafeArenaAddAllocated prevents this.
@@ -970,6 +996,11 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
     return GetArenaNoVirtual();
   }
 
+  // For internal use only.
+  //
+  // This is public due to it being called by generated code.
+  using RepeatedPtrFieldBase::InternalSwap;
+
  private:
   // Note:  RepeatedPtrField SHOULD NOT be subclassed by users.
   class TypeHandler;
@@ -982,11 +1013,13 @@ class RepeatedPtrField PROTOBUF_FINAL : public internal::RepeatedPtrFieldBase {
   // MergeFrom()), so we must resolve this at compile time. ExtractSubrange()
   // uses SFINAE to choose one of the below implementations.
   void ExtractSubrangeInternal(int start, int num, Element** elements,
-                               google::protobuf::internal::true_type);
+                               std::true_type);
   void ExtractSubrangeInternal(int start, int num, Element** elements,
-                               google::protobuf::internal::false_type);
+                               std::false_type);
 
   friend class Arena;
+  friend class MessageLite;
+
   typedef void InternalArenaConstructable_;
 
 };
@@ -997,33 +1030,25 @@ template <typename Element>
 inline RepeatedField<Element>::RepeatedField()
   : current_size_(0),
     total_size_(0),
-    rep_(NULL) {
+    ptr_(NULL) {
 }
 
 template <typename Element>
 inline RepeatedField<Element>::RepeatedField(Arena* arena)
   : current_size_(0),
     total_size_(0),
-    rep_(NULL) {
-  // In case arena is NULL, then we do not create rep_, as code has an invariant
-  // `rep_ == NULL then arena == NULL`.
-  if (arena != NULL) {
-    rep_ = reinterpret_cast<Rep*>(
-        ::google::protobuf::Arena::CreateArray<char>(arena, kRepHeaderSize));
-    rep_->arena = arena;
-  }
+    ptr_(arena) {
 }
 
 template <typename Element>
 inline RepeatedField<Element>::RepeatedField(const RepeatedField& other)
   : current_size_(0),
     total_size_(0),
-    rep_(NULL) {
+    ptr_(NULL) {
   if (other.current_size_ != 0) {
-    Reserve(other.current_size_);
-    CopyArray(rep_->elements,
-              other.rep_->elements, other.current_size_);
-    current_size_ = other.current_size_;
+    Reserve(other.size());
+    AddNAlreadyReserved(other.size());
+    CopyArray(Mutable(0), &other.Get(0), other.size());
   }
 }
 
@@ -1032,7 +1057,7 @@ template <typename Iter>
 RepeatedField<Element>::RepeatedField(Iter begin, const Iter& end)
   : current_size_(0),
     total_size_(0),
-    rep_(NULL) {
+    ptr_(NULL) {
   int reserve = internal::CalculateReserve(begin, end);
   if (reserve != -1) {
     Reserve(reserve);
@@ -1048,9 +1073,9 @@ RepeatedField<Element>::RepeatedField(Iter begin, const Iter& end)
 
 template <typename Element>
 RepeatedField<Element>::~RepeatedField() {
-  // See explanation in Reserve(): we need to invoke destructors here for the
-  // case that Element has a non-trivial destructor.
-  InternalDeallocate(rep_, total_size_);
+  if (total_size_ > 0) {
+    InternalDeallocate(rep(), total_size_);
+  }
 }
 
 template <typename Element>
@@ -1062,6 +1087,33 @@ RepeatedField<Element>::operator=(const RepeatedField& other) {
 }
 
 template <typename Element>
+inline RepeatedField<Element>::RepeatedField(RepeatedField&& other) noexcept
+    : RepeatedField() {
+  // We don't just call Swap(&other) here because it would perform 3 copies if
+  // the two fields are on different arenas.
+  if (other.GetArenaNoVirtual()) {
+    CopyFrom(other);
+  } else {
+    InternalSwap(&other);
+  }
+}
+
+template <typename Element>
+inline RepeatedField<Element>& RepeatedField<Element>::operator=(
+    RepeatedField&& other) noexcept {
+  // We don't just call Swap(&other) here because it would perform 3 copies if
+  // the two fields are on different arenas.
+  if (this != &other) {
+    if (this->GetArenaNoVirtual() != other.GetArenaNoVirtual()) {
+      CopyFrom(other);
+    } else {
+      InternalSwap(&other);
+    }
+  }
+  return *this;
+}
+
+template <typename Element>
 inline bool RepeatedField<Element>::empty() const {
   return current_size_ == 0;
 }
@@ -1079,13 +1131,23 @@ inline int RepeatedField<Element>::Capacity() const {
 template<typename Element>
 inline void RepeatedField<Element>::AddAlreadyReserved(const Element& value) {
   GOOGLE_DCHECK_LT(current_size_, total_size_);
-  rep_->elements[current_size_++] = value;
+  rep()->elements[current_size_++] = value;
 }
 
 template<typename Element>
 inline Element* RepeatedField<Element>::AddAlreadyReserved() {
   GOOGLE_DCHECK_LT(current_size_, total_size_);
-  return &rep_->elements[current_size_++];
+  return &rep()->elements[current_size_++];
+}
+
+template<typename Element>
+inline Element* RepeatedField<Element>::AddNAlreadyReserved(int elements) {
+  GOOGLE_DCHECK_LE(current_size_ + elements, total_size_);
+  // Warning: total_size_ can be NULL if elements == 0 && current_size_ == 0.
+  // Existing callers depend on this behavior. :(
+  Element* ret = &ptr_.rep->elements[current_size_];
+  current_size_ += elements;
+  return ret;
 }
 
 template<typename Element>
@@ -1093,8 +1155,8 @@ inline void RepeatedField<Element>::Resize(int new_size, const Element& value) {
   GOOGLE_DCHECK_GE(new_size, 0);
   if (new_size > current_size_) {
     Reserve(new_size);
-    std::fill(&rep_->elements[current_size_],
-              &rep_->elements[new_size], value);
+    std::fill(&rep()->elements[current_size_],
+              &rep()->elements[new_size], value);
   }
   current_size_ = new_size;
 }
@@ -1103,33 +1165,33 @@ template <typename Element>
 inline const Element& RepeatedField<Element>::Get(int index) const {
   GOOGLE_DCHECK_GE(index, 0);
   GOOGLE_DCHECK_LT(index, current_size_);
-  return rep_->elements[index];
+  return rep()->elements[index];
 }
 
 template <typename Element>
 inline Element* RepeatedField<Element>::Mutable(int index) {
   GOOGLE_DCHECK_GE(index, 0);
   GOOGLE_DCHECK_LT(index, current_size_);
-  return &rep_->elements[index];
+  return &rep()->elements[index];
 }
 
 template <typename Element>
 inline void RepeatedField<Element>::Set(int index, const Element& value) {
   GOOGLE_DCHECK_GE(index, 0);
   GOOGLE_DCHECK_LT(index, current_size_);
-  rep_->elements[index] = value;
+  rep()->elements[index] = value;
 }
 
 template <typename Element>
 inline void RepeatedField<Element>::Add(const Element& value) {
   if (current_size_ == total_size_) Reserve(total_size_ + 1);
-  rep_->elements[current_size_++] = value;
+  rep()->elements[current_size_++] = value;
 }
 
 template <typename Element>
 inline Element* RepeatedField<Element>::Add() {
   if (current_size_ == total_size_) Reserve(total_size_ + 1);
-  return &rep_->elements[current_size_++];
+  return &rep()->elements[current_size_++];
 }
 
 template <typename Element>
@@ -1168,10 +1230,10 @@ template <typename Element>
 inline void RepeatedField<Element>::MergeFrom(const RepeatedField& other) {
   GOOGLE_DCHECK_NE(&other, this);
   if (other.current_size_ != 0) {
-    Reserve(current_size_ + other.current_size_);
-    CopyArray(rep_->elements + current_size_,
-              other.rep_->elements, other.current_size_);
-    current_size_ += other.current_size_;
+    int existing_size = size();
+    Reserve(existing_size + other.size());
+    AddNAlreadyReserved(other.size());
+    CopyArray(Mutable(existing_size), &other.Get(0), other.size());
   }
 }
 
@@ -1200,18 +1262,25 @@ inline typename RepeatedField<Element>::iterator RepeatedField<Element>::erase(
 
 template <typename Element>
 inline Element* RepeatedField<Element>::mutable_data() {
-  return rep_ ? rep_->elements : NULL;
+  return total_size_ > 0 ? rep()->elements : NULL;
 }
 
 template <typename Element>
 inline const Element* RepeatedField<Element>::data() const {
-  return rep_ ? rep_->elements : NULL;
+  return total_size_ > 0 ? rep()->elements : NULL;
 }
 
+template <typename Element>
+inline const Element* RepeatedField<Element>::unsafe_data() const {
+  return rep()->elements;
+}
 
 template <typename Element>
 inline void RepeatedField<Element>::InternalSwap(RepeatedField* other) {
-  std::swap(rep_, other->rep_);
+  GOOGLE_DCHECK(this != other);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
+
+  std::swap(ptr_, other->ptr_);
   std::swap(current_size_, other->current_size_);
   std::swap(total_size_, other->total_size_);
 }
@@ -1219,7 +1288,7 @@ inline void RepeatedField<Element>::InternalSwap(RepeatedField* other) {
 template <typename Element>
 void RepeatedField<Element>::Swap(RepeatedField* other) {
   if (this == other) return;
-  if (GetArenaNoVirtual() ==  other->GetArenaNoVirtual()) {
+  if (GetArenaNoVirtual() == other->GetArenaNoVirtual()) {
     InternalSwap(other);
   } else {
     RepeatedField<Element> temp(other->GetArenaNoVirtual());
@@ -1232,51 +1301,49 @@ void RepeatedField<Element>::Swap(RepeatedField* other) {
 template <typename Element>
 void RepeatedField<Element>::UnsafeArenaSwap(RepeatedField* other) {
   if (this == other) return;
-  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   InternalSwap(other);
 }
 
 template <typename Element>
 void RepeatedField<Element>::SwapElements(int index1, int index2) {
   using std::swap;  // enable ADL with fallback
-  swap(rep_->elements[index1], rep_->elements[index2]);
+  swap(rep()->elements[index1], rep()->elements[index2]);
 }
 
 template <typename Element>
 inline typename RepeatedField<Element>::iterator
 RepeatedField<Element>::begin() {
-  return rep_ ? rep_->elements : NULL;
+  return total_size_ > 0 ? rep()->elements : NULL;
 }
 template <typename Element>
 inline typename RepeatedField<Element>::const_iterator
 RepeatedField<Element>::begin() const {
-  return rep_ ? rep_->elements : NULL;
+  return total_size_ > 0 ? rep()->elements : NULL;
 }
 template <typename Element>
 inline typename RepeatedField<Element>::const_iterator
 RepeatedField<Element>::cbegin() const {
-  return rep_ ? rep_->elements : NULL;
+  return total_size_ > 0 ? rep()->elements : NULL;
 }
 template <typename Element>
 inline typename RepeatedField<Element>::iterator
 RepeatedField<Element>::end() {
-  return rep_ ? rep_->elements + current_size_ : NULL;
+  return total_size_ > 0 ? rep()->elements + current_size_ : NULL;
 }
 template <typename Element>
 inline typename RepeatedField<Element>::const_iterator
 RepeatedField<Element>::end() const {
-  return rep_ ? rep_->elements + current_size_ : NULL;
+  return total_size_ > 0 ? rep()->elements + current_size_ : NULL;
 }
 template <typename Element>
 inline typename RepeatedField<Element>::const_iterator
 RepeatedField<Element>::cend() const {
-  return rep_ ? rep_->elements + current_size_ : NULL;
+  return total_size_ > 0 ? rep()->elements + current_size_ : NULL;
 }
 
 template <typename Element>
-inline int RepeatedField<Element>::SpaceUsedExcludingSelf() const {
-  return rep_ ?
-      (total_size_ * sizeof(Element) + kRepHeaderSize) : 0;
+inline size_t RepeatedField<Element>::SpaceUsedExcludingSelfLong() const {
+  return total_size_ > 0 ? (total_size_ * sizeof(Element) + kRepHeaderSize) : 0;
 }
 
 // Avoid inlining of Reserve(): new, copy, and delete[] lead to a significant
@@ -1284,22 +1351,22 @@ inline int RepeatedField<Element>::SpaceUsedExcludingSelf() const {
 template <typename Element>
 void RepeatedField<Element>::Reserve(int new_size) {
   if (total_size_ >= new_size) return;
-  Rep* old_rep = rep_;
+  Rep* old_rep = total_size_ > 0 ? rep() : NULL;
   Arena* arena = GetArenaNoVirtual();
   new_size = std::max(google::protobuf::internal::kMinRepeatedFieldAllocationSize,
                       std::max(total_size_ * 2, new_size));
-  GOOGLE_CHECK_LE(static_cast<size_t>(new_size),
-           (std::numeric_limits<size_t>::max() - kRepHeaderSize) /
-           sizeof(Element))
+  GOOGLE_DCHECK_LE(
+      static_cast<size_t>(new_size),
+      (std::numeric_limits<size_t>::max() - kRepHeaderSize) / sizeof(Element))
       << "Requested size is too large to fit into size_t.";
-  size_t bytes = kRepHeaderSize + sizeof(Element) * new_size;
+  size_t bytes = kRepHeaderSize + sizeof(Element) * static_cast<size_t>(new_size);
   if (arena == NULL) {
-    rep_ = static_cast<Rep*>(::operator new(bytes));
+    ptr_.rep = static_cast<Rep*>(::operator new(bytes));
   } else {
-    rep_ = reinterpret_cast<Rep*>(
+    ptr_.rep = reinterpret_cast<Rep*>(
             ::google::protobuf::Arena::CreateArray<char>(arena, bytes));
   }
-  rep_->arena = arena;
+  ptr_.rep->arena = arena;
   int old_total_size = total_size_;
   total_size_ = new_size;
   // Invoke placement-new on newly allocated elements. We shouldn't have to do
@@ -1311,13 +1378,13 @@ void RepeatedField<Element>::Reserve(int new_size) {
   // effect unless its side-effects are required for correctness.
   // Note that we do this before MoveArray() below because Element's copy
   // assignment implementation will want an initialized instance first.
-  Element* e = &rep_->elements[0];
-  Element* limit = &rep_->elements[total_size_];
+  Element* e = &rep()->elements[0];
+  Element* limit = e + total_size_;
   for (; e < limit; e++) {
     new (e) Element;
   }
   if (current_size_ > 0) {
-    MoveArray(rep_->elements, old_rep->elements, current_size_);
+    MoveArray(&rep()->elements[0], old_rep->elements, current_size_);
   }
 
   // Likewise, we need to invoke destructors on the old array.
@@ -1356,7 +1423,7 @@ void ElementCopier<Element, HasTrivialCopy>::operator()(
 template <typename Element>
 struct ElementCopier<Element, true> {
   void operator()(Element* to, const Element* from, int array_size) {
-    memcpy(to, from, array_size * sizeof(Element));
+    memcpy(to, from, static_cast<size_t>(array_size) * sizeof(Element));
   }
 };
 
@@ -1433,14 +1500,13 @@ inline int RepeatedPtrFieldBase::size() const {
 }
 
 template <typename TypeHandler>
-inline const typename TypeHandler::Type&
+inline const typename TypeHandler::WeakType&
 RepeatedPtrFieldBase::Get(int index) const {
   GOOGLE_DCHECK_GE(index, 0);
   GOOGLE_DCHECK_LT(index, current_size_);
   return *cast<TypeHandler>(rep_->elements[index]);
 }
 
-
 template <typename TypeHandler>
 inline typename TypeHandler::Type*
 RepeatedPtrFieldBase::Mutable(int index) {
@@ -1472,13 +1538,13 @@ inline typename TypeHandler::Type* RepeatedPtrFieldBase::Add(
   return result;
 }
 
-#if LANG_CXX11
 template <typename TypeHandler>
 inline void RepeatedPtrFieldBase::Add(
     typename TypeHandler::Type&& value,
     std::enable_if<TypeHandler::Moveable>*) {
   if (rep_ != NULL && current_size_ < rep_->allocated_size) {
-    cast<TypeHandler>(rep_->elements[current_size_++]) = std::move(value);
+    *cast<TypeHandler>(rep_->elements[current_size_++]) = std::move(value);
+    return;
   }
   if (!rep_ || rep_->allocated_size == total_size_) {
     Reserve(total_size_ + 1);
@@ -1488,7 +1554,6 @@ inline void RepeatedPtrFieldBase::Add(
       TypeHandler::New(arena_, std::move(value));
   rep_->elements[current_size_++] = result;
 }
-#endif
 
 template <typename TypeHandler>
 inline void RepeatedPtrFieldBase::RemoveLast() {
@@ -1548,18 +1613,18 @@ void RepeatedPtrFieldBase::MergeFromInnerLoop(
   // to avoid a branch within the loop.
   for (int i = 0; i < already_allocated && i < length; i++) {
     // Already allocated: use existing element.
-    typename TypeHandler::Type* other_elem =
-        reinterpret_cast<typename TypeHandler::Type*>(other_elems[i]);
-    typename TypeHandler::Type* new_elem =
-        reinterpret_cast<typename TypeHandler::Type*>(our_elems[i]);
+    typename TypeHandler::WeakType* other_elem =
+        reinterpret_cast<typename TypeHandler::WeakType*>(other_elems[i]);
+    typename TypeHandler::WeakType* new_elem =
+        reinterpret_cast<typename TypeHandler::WeakType*>(our_elems[i]);
     TypeHandler::Merge(*other_elem, new_elem);
   }
   Arena* arena = GetArenaNoVirtual();
   for (int i = already_allocated; i < length; i++) {
     // Not allocated: alloc a new element first, then merge it.
-    typename TypeHandler::Type* other_elem =
-        reinterpret_cast<typename TypeHandler::Type*>(other_elems[i]);
-    typename TypeHandler::Type* new_elem =
+    typename TypeHandler::WeakType* other_elem =
+        reinterpret_cast<typename TypeHandler::WeakType*>(other_elems[i]);
+    typename TypeHandler::WeakType* new_elem =
         TypeHandler::NewFromPrototype(other_elem, arena);
     TypeHandler::Merge(*other_elem, new_elem);
     our_elems[i] = new_elem;
@@ -1606,11 +1671,11 @@ inline void RepeatedPtrFieldBase::SwapElements(int index1, int index2) {
 }
 
 template <typename TypeHandler>
-inline int RepeatedPtrFieldBase::SpaceUsedExcludingSelf() const {
-  int allocated_bytes = total_size_ * sizeof(void*);
+inline size_t RepeatedPtrFieldBase::SpaceUsedExcludingSelfLong() const {
+  size_t allocated_bytes = static_cast<size_t>(total_size_) * sizeof(void*);
   if (rep_ != NULL) {
     for (int i = 0; i < rep_->allocated_size; ++i) {
-      allocated_bytes += TypeHandler::SpaceUsed(
+      allocated_bytes += TypeHandler::SpaceUsedLong(
           *cast<TypeHandler>(rep_->elements[i]));
     }
     allocated_bytes += kRepHeaderSize;
@@ -1631,7 +1696,7 @@ inline typename TypeHandler::Type* RepeatedPtrFieldBase::AddFromCleared() {
 template <typename TypeHandler>
 void RepeatedPtrFieldBase::AddAllocatedInternal(
     typename TypeHandler::Type* value,
-    google::protobuf::internal::true_type) {
+    std::true_type) {
   Arena* element_arena = reinterpret_cast<Arena*>(
       TypeHandler::GetMaybeArenaPointer(value));
   Arena* arena = GetArenaNoVirtual();
@@ -1649,7 +1714,6 @@ void RepeatedPtrFieldBase::AddAllocatedInternal(
     elems[current_size_] = value;
     current_size_ = current_size_ + 1;
     rep_->allocated_size = rep_->allocated_size + 1;
-    return;
   } else {
     AddAllocatedSlowWithCopy<TypeHandler>(
         value, TypeHandler::GetArena(value), arena);
@@ -1682,7 +1746,7 @@ void RepeatedPtrFieldBase::AddAllocatedSlowWithCopy(
 template <typename TypeHandler>
 void RepeatedPtrFieldBase::AddAllocatedInternal(
     typename TypeHandler::Type* value,
-    google::protobuf::internal::false_type) {
+    std::false_type) {
   if (rep_ &&  rep_->allocated_size < total_size_) {
     // Fast path: underlying arena representation (tagged pointer) is equal to
     // our arena pointer, and we can add to array without resizing it (at least
@@ -1696,7 +1760,6 @@ void RepeatedPtrFieldBase::AddAllocatedInternal(
     elems[current_size_] = value;
     current_size_ = current_size_ + 1;
     ++rep_->allocated_size;
-    return;
   } else {
     UnsafeArenaAddAllocated<TypeHandler>(value);
   }
@@ -1733,7 +1796,7 @@ void RepeatedPtrFieldBase::UnsafeArenaAddAllocated(
 // ReleaseLast() for types that implement merge/copy behavior.
 template <typename TypeHandler>
 inline typename TypeHandler::Type*
-RepeatedPtrFieldBase::ReleaseLastInternal(google::protobuf::internal::true_type) {
+RepeatedPtrFieldBase::ReleaseLastInternal(std::true_type) {
   // First, release an element.
   typename TypeHandler::Type* result = UnsafeArenaReleaseLast<TypeHandler>();
   // Now perform a copy if we're on an arena.
@@ -1754,7 +1817,7 @@ RepeatedPtrFieldBase::ReleaseLastInternal(google::protobuf::internal::true_type)
 // case.
 template <typename TypeHandler>
 inline typename TypeHandler::Type*
-RepeatedPtrFieldBase::ReleaseLastInternal(google::protobuf::internal::false_type) {
+RepeatedPtrFieldBase::ReleaseLastInternal(std::false_type) {
   GOOGLE_DCHECK(GetArenaNoVirtual() == NULL)
       << "ReleaseLast() called on a RepeatedPtrField that is on an arena, "
       << "with a type that does not implement MergeFrom. This is unsafe; "
@@ -1819,7 +1882,6 @@ class RepeatedPtrField<string>::TypeHandler
     : public internal::StringTypeHandler {
 };
 
-
 template <typename Element>
 inline RepeatedPtrField<Element>::RepeatedPtrField()
   : RepeatedPtrFieldBase() {}
@@ -1862,6 +1924,34 @@ inline RepeatedPtrField<Element>& RepeatedPtrField<Element>::operator=(
 }
 
 template <typename Element>
+inline RepeatedPtrField<Element>::RepeatedPtrField(
+    RepeatedPtrField&& other) noexcept
+    : RepeatedPtrField() {
+  // We don't just call Swap(&other) here because it would perform 3 copies if
+  // the two fields are on different arenas.
+  if (other.GetArenaNoVirtual()) {
+    CopyFrom(other);
+  } else {
+    InternalSwap(&other);
+  }
+}
+
+template <typename Element>
+inline RepeatedPtrField<Element>& RepeatedPtrField<Element>::operator=(
+    RepeatedPtrField&& other) noexcept {
+  // We don't just call Swap(&other) here because it would perform 3 copies if
+  // the two fields are on different arenas.
+  if (this != &other) {
+    if (this->GetArenaNoVirtual() != other.GetArenaNoVirtual()) {
+      CopyFrom(other);
+    } else {
+      InternalSwap(&other);
+    }
+  }
+  return *this;
+}
+
+template <typename Element>
 inline bool RepeatedPtrField<Element>::empty() const {
   return RepeatedPtrFieldBase::empty();
 }
@@ -1887,12 +1977,10 @@ inline Element* RepeatedPtrField<Element>::Add() {
   return RepeatedPtrFieldBase::Add<TypeHandler>();
 }
 
-#if LANG_CXX11
 template <typename Element>
 inline void RepeatedPtrField<Element>::Add(Element&& value) {
   RepeatedPtrFieldBase::Add<TypeHandler>(std::move(value));
 }
-#endif
 
 template <typename Element>
 inline void RepeatedPtrField<Element>::RemoveLast() {
@@ -1922,7 +2010,7 @@ inline void RepeatedPtrField<Element>::ExtractSubrange(
 // behavior.
 template <typename Element>
 inline void RepeatedPtrField<Element>::ExtractSubrangeInternal(
-    int start, int num, Element** elements, google::protobuf::internal::true_type) {
+    int start, int num, Element** elements, std::true_type) {
   GOOGLE_DCHECK_GE(start, 0);
   GOOGLE_DCHECK_GE(num, 0);
   GOOGLE_DCHECK_LE(start + num, size());
@@ -1955,7 +2043,7 @@ inline void RepeatedPtrField<Element>::ExtractSubrangeInternal(
 // behavior.
 template<typename Element>
 inline void RepeatedPtrField<Element>::ExtractSubrangeInternal(
-    int start, int num, Element** elements, google::protobuf::internal::false_type) {
+    int start, int num, Element** elements, std::false_type) {
   // This case is identical to UnsafeArenaExtractSubrange(). However, since
   // ExtractSubrange() must return heap-allocated objects by contract, and we
   // cannot fulfill this contract if we are an on arena, we must GOOGLE_DCHECK() that
@@ -2036,7 +2124,6 @@ inline void RepeatedPtrField<Element>::Swap(RepeatedPtrField* other) {
 template <typename Element>
 inline void RepeatedPtrField<Element>::UnsafeArenaSwap(
     RepeatedPtrField* other) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
   if (this == other)
       return;
   RepeatedPtrFieldBase::InternalSwap(other);
@@ -2053,8 +2140,8 @@ inline Arena* RepeatedPtrField<Element>::GetArenaNoVirtual() const {
 }
 
 template <typename Element>
-inline int RepeatedPtrField<Element>::SpaceUsedExcludingSelf() const {
-  return RepeatedPtrFieldBase::SpaceUsedExcludingSelf<TypeHandler>();
+inline size_t RepeatedPtrField<Element>::SpaceUsedExcludingSelfLong() const {
+  return RepeatedPtrFieldBase::SpaceUsedExcludingSelfLong<TypeHandler>();
 }
 
 template <typename Element>
@@ -2128,7 +2215,7 @@ class RepeatedPtrIterator
 
   // Shadow the value_type in std::iterator<> because const_iterator::value_type
   // needs to be T, not const T.
-  typedef typename remove_const<Element>::type value_type;
+  typedef typename std::remove_const<Element>::type value_type;
 
   // Let the compiler know that these are type names, so we don't have to
   // write "typename" in front of them everywhere.
@@ -2146,7 +2233,7 @@ class RepeatedPtrIterator
       : it_(other.it_) {
     // Force a compiler error if the other type is not convertible to ours.
     if (false) {
-      implicit_cast<Element*, OtherElement*>(0);
+      implicit_cast<Element*>(static_cast<OtherElement*>(nullptr));
     }
   }
 
@@ -2212,18 +2299,17 @@ class RepeatedPtrIterator
 // the array.
 // The VoidPtr template parameter holds the type-agnostic pointer value
 // referenced by the iterator.  It should either be "void *" for a mutable
-// iterator, or "const void *" for a constant iterator.
-template<typename Element, typename VoidPtr>
+// iterator, or "const void* const" for a constant iterator.
+template <typename Element, typename VoidPtr>
 class RepeatedPtrOverPtrsIterator
-    : public std::iterator<std::random_access_iterator_tag, Element*> {
+    : public std::iterator<std::random_access_iterator_tag, Element> {
  public:
   typedef RepeatedPtrOverPtrsIterator<Element, VoidPtr> iterator;
-  typedef std::iterator<
-          std::random_access_iterator_tag, Element*> superclass;
+  typedef std::iterator<std::random_access_iterator_tag, Element> superclass;
 
   // Shadow the value_type in std::iterator<> because const_iterator::value_type
   // needs to be T, not const T.
-  typedef typename remove_const<Element*>::type value_type;
+  typedef typename std::remove_const<Element>::type value_type;
 
   // Let the compiler know that these are type names, so we don't have to
   // write "typename" in front of them everywhere.
@@ -2235,7 +2321,7 @@ class RepeatedPtrOverPtrsIterator
   explicit RepeatedPtrOverPtrsIterator(VoidPtr* it) : it_(it) {}
 
   // dereferenceable
-  reference operator*() const { return *reinterpret_cast<Element**>(it_); }
+  reference operator*() const { return *reinterpret_cast<Element*>(it_); }
   pointer   operator->() const { return &(operator*()); }
 
   // {inc,dec}rementable
@@ -2291,6 +2377,9 @@ class RepeatedPtrOverPtrsIterator
 };
 
 void RepeatedPtrFieldBase::InternalSwap(RepeatedPtrFieldBase* other) {
+  GOOGLE_DCHECK(this != other);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == other->GetArenaNoVirtual());
+
   std::swap(rep_, other->rep_);
   std::swap(current_size_, other->current_size_);
   std::swap(total_size_, other->total_size_);
@@ -2337,7 +2426,7 @@ RepeatedPtrField<Element>::pointer_begin() {
 template <typename Element>
 inline typename RepeatedPtrField<Element>::const_pointer_iterator
 RepeatedPtrField<Element>::pointer_begin() const {
-  return const_pointer_iterator(const_cast<const void**>(raw_mutable_data()));
+  return const_pointer_iterator(const_cast<const void* const*>(raw_data()));
 }
 template <typename Element>
 inline typename RepeatedPtrField<Element>::pointer_iterator
@@ -2348,7 +2437,7 @@ template <typename Element>
 inline typename RepeatedPtrField<Element>::const_pointer_iterator
 RepeatedPtrField<Element>::pointer_end() const {
   return const_pointer_iterator(
-      const_cast<const void**>(raw_mutable_data() + size()));
+      const_cast<const void* const*>(raw_data() + size()));
 }
 
 
@@ -2405,6 +2494,10 @@ template<typename T> class RepeatedPtrFieldBackInsertIterator
     *field_->Add() = *ptr_to_value;
     return *this;
   }
+  RepeatedPtrFieldBackInsertIterator<T>& operator=(T&& value) {
+    *field_->Add() = std::move(value);
+    return *this;
+  }
   RepeatedPtrFieldBackInsertIterator<T>& operator*() {
     return *this;
   }
@@ -2519,7 +2612,7 @@ AllocatedRepeatedPtrFieldBackInserter(
 //   RepeatedPtrField<T> temp_field;
 //   temp_field.AddAllocated(new T);
 //   ... // Do something with temp_field
-//   temp_field.ExtractSubrange(0, temp_field.size(), NULL);
+//   temp_field.ExtractSubrange(0, temp_field.size(), nullptr);
 // If you put temp_field on the arena this fails, because the ownership
 // transfers to the arena at the "AddAllocated" call and is not released anymore
 // causing a double delete. Using UnsafeArenaAddAllocated prevents this.
diff --git a/src/google/protobuf/repeated_field_reflection_unittest.cc b/src/google/protobuf/repeated_field_reflection_unittest.cc
index fcebe5ce..74ec83b0 100644
--- a/src/google/protobuf/repeated_field_reflection_unittest.cc
+++ b/src/google/protobuf/repeated_field_reflection_unittest.cc
@@ -189,8 +189,8 @@ TEST(RepeatedFieldReflectionTest, ExtensionFields) {
   }
 }
 
-template<typename Ref, typename MessageType, typename ValueType>
-void TestRepeatedFieldRefIterator(
+template <typename Ref, typename MessageType, typename ValueType>
+void TestRepeatedFieldRefIteratorForPrimitive(
     const Ref& handle, const MessageType& message,
     ValueType (MessageType::*GetFunc)(int) const) {
   int index = 0;
@@ -202,6 +202,21 @@ void TestRepeatedFieldRefIterator(
   EXPECT_EQ(handle.size(), index);
 }
 
+template <typename MessageType, typename ValueType>
+void TestRepeatedFieldRefIteratorForString(
+    const RepeatedFieldRef<string>& handle, const MessageType& message,
+    ValueType (MessageType::*GetFunc)(int) const) {
+  int index = 0;
+  for (typename RepeatedFieldRef<string>::const_iterator it = handle.begin();
+       it != handle.end(); ++it) {
+    // Test both operator* and operator->
+    EXPECT_EQ((message.*GetFunc)(index), *it);
+    EXPECT_EQ((message.*GetFunc)(index).size(), it->size());
+    ++index;
+  }
+  EXPECT_EQ(handle.size(), index);
+}
+
 TEST(RepeatedFieldReflectionTest, RepeatedFieldRefForRegularFields) {
   TestAllTypes message;
   const Reflection* refl = message.GetReflection();
@@ -312,12 +327,12 @@ TEST(RepeatedFieldReflectionTest, RepeatedFieldRefForRegularFields) {
   }
 
   // Test iterators.
-  TestRepeatedFieldRefIterator(rf_int32, message,
-                               &TestAllTypes::repeated_int32);
-  TestRepeatedFieldRefIterator(rf_double, message,
-                               &TestAllTypes::repeated_double);
-  TestRepeatedFieldRefIterator(rf_string, message,
-                               &TestAllTypes::repeated_string);
+  TestRepeatedFieldRefIteratorForPrimitive(rf_int32, message,
+                                           &TestAllTypes::repeated_int32);
+  TestRepeatedFieldRefIteratorForPrimitive(rf_double, message,
+                                           &TestAllTypes::repeated_double);
+  TestRepeatedFieldRefIteratorForString(rf_string, message,
+                                        &TestAllTypes::repeated_string);
 
   // Test iterators for message fields.
   typedef RepeatedFieldRef<ForeignMessage>::iterator MessageIterator;
@@ -474,10 +489,10 @@ TEST(RepeatedFieldReflectionTest, RepeatedFieldRefForEnums) {
     EXPECT_EQ(TestAllTypes::BAZ, message.repeated_nested_enum(i));
   }
 
-  TestRepeatedFieldRefIterator(enum_ref, message,
-                               &TestAllTypes::repeated_nested_enum);
-  TestRepeatedFieldRefIterator(int32_ref, message,
-                               &TestAllTypes::repeated_nested_enum);
+  TestRepeatedFieldRefIteratorForPrimitive(enum_ref, message,
+                                           &TestAllTypes::repeated_nested_enum);
+  TestRepeatedFieldRefIteratorForPrimitive(int32_ref, message,
+                                           &TestAllTypes::repeated_nested_enum);
 
   // Test Add()
   mutable_enum_ref.Add(TestAllTypes::FOO);
@@ -689,7 +704,7 @@ TEST(RepeatedFieldReflectionTest, RepeatedFieldRefDynamicMessage) {
       desc->FindFieldByName("repeated_int32");
 
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> dynamic_message(factory.GetPrototype(desc)->New());
+  std::unique_ptr<Message> dynamic_message(factory.GetPrototype(desc)->New());
   const Reflection* refl = dynamic_message->GetReflection();
 
   MutableRepeatedFieldRef<int32> rf_int32 =
diff --git a/src/google/protobuf/repeated_field_unittest.cc b/src/google/protobuf/repeated_field_unittest.cc
index ec1074c9..053a4d68 100644
--- a/src/google/protobuf/repeated_field_unittest.cc
+++ b/src/google/protobuf/repeated_field_unittest.cc
@@ -45,17 +45,19 @@
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/unittest.pb.h>
-#include <google/protobuf/stubs/strutil.h>
+#include <gmock/gmock.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
+#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/stl_util.h>
 
 namespace google {
-using protobuf_unittest::TestAllTypes;
-
 namespace protobuf {
 namespace {
 
+using ::protobuf_unittest::TestAllTypes;
+using ::testing::ElementsAre;
+
 // Test operations on a small RepeatedField.
 TEST(RepeatedField, Small) {
   RepeatedField<int> field;
@@ -267,15 +269,6 @@ TEST(RepeatedField, MergeFrom) {
   EXPECT_EQ(5, destination.Get(4));
 }
 
-#ifdef PROTOBUF_HAS_DEATH_TEST
-#ifndef NDEBUG
-TEST(RepeatedField, MergeFromSelf) {
-  RepeatedField<int> me;
-  me.Add(3);
-  EXPECT_DEATH(me.MergeFrom(me), "");
-}
-#endif  // NDEBUG
-#endif  // PROTOBUF_HAS_DEATH_TEST
 
 TEST(RepeatedField, CopyFrom) {
   RepeatedField<int> source, destination;
@@ -390,6 +383,138 @@ TEST(RepeatedField, SelfAssign) {
   EXPECT_EQ(8, source.Get(1));
 }
 
+TEST(RepeatedField, MoveConstruct) {
+  {
+    RepeatedField<int> source;
+    source.Add(1);
+    source.Add(2);
+    const int* data = source.data();
+    RepeatedField<int> destination = std::move(source);
+    EXPECT_EQ(data, destination.data());
+    EXPECT_THAT(destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_TRUE(source.empty());
+  }
+  {
+    Arena arena;
+    RepeatedField<int>* source =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    source->Add(1);
+    source->Add(2);
+    RepeatedField<int> destination = std::move(*source);
+    EXPECT_EQ(nullptr, destination.GetArena());
+    EXPECT_THAT(destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre(1, 2));
+  }
+}
+
+TEST(RepeatedField, MoveAssign) {
+  {
+    RepeatedField<int> source;
+    source.Add(1);
+    source.Add(2);
+    RepeatedField<int> destination;
+    destination.Add(3);
+    const int* source_data = source.data();
+    const int* destination_data = destination.data();
+    destination = std::move(source);
+    EXPECT_EQ(source_data, destination.data());
+    EXPECT_THAT(destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_EQ(destination_data, source.data());
+    EXPECT_THAT(source, ElementsAre(3));
+  }
+  {
+    Arena arena;
+    RepeatedField<int>* source =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    source->Add(1);
+    source->Add(2);
+    RepeatedField<int>* destination =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    destination->Add(3);
+    const int* source_data = source->data();
+    const int* destination_data = destination->data();
+    *destination = std::move(*source);
+    EXPECT_EQ(source_data, destination->data());
+    EXPECT_THAT(*destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_EQ(destination_data, source->data());
+    EXPECT_THAT(*source, ElementsAre(3));
+  }
+  {
+    Arena source_arena;
+    RepeatedField<int>* source =
+        Arena::CreateMessage<RepeatedField<int>>(&source_arena);
+    source->Add(1);
+    source->Add(2);
+    Arena destination_arena;
+    RepeatedField<int>* destination =
+        Arena::CreateMessage<RepeatedField<int>>(&destination_arena);
+    destination->Add(3);
+    *destination = std::move(*source);
+    EXPECT_THAT(*destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre(1, 2));
+  }
+  {
+    Arena arena;
+    RepeatedField<int>* source =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    source->Add(1);
+    source->Add(2);
+    RepeatedField<int> destination;
+    destination.Add(3);
+    destination = std::move(*source);
+    EXPECT_THAT(destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre(1, 2));
+  }
+  {
+    RepeatedField<int> source;
+    source.Add(1);
+    source.Add(2);
+    Arena arena;
+    RepeatedField<int>* destination =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    destination->Add(3);
+    *destination = std::move(source);
+    EXPECT_THAT(*destination, ElementsAre(1, 2));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(source, ElementsAre(1, 2));
+  }
+  {
+    RepeatedField<int> field;
+    // An alias to defeat -Wself-move.
+    RepeatedField<int>& alias = field;
+    field.Add(1);
+    field.Add(2);
+    const int* data = field.data();
+    field = std::move(alias);
+    EXPECT_EQ(data, field.data());
+    EXPECT_THAT(field, ElementsAre(1, 2));
+  }
+  {
+    Arena arena;
+    RepeatedField<int>* field =
+        Arena::CreateMessage<RepeatedField<int>>(&arena);
+    field->Add(1);
+    field->Add(2);
+    const int* data = field->data();
+    *field = std::move(*field);
+    EXPECT_EQ(data, field->data());
+    EXPECT_THAT(*field, ElementsAre(1, 2));
+  }
+}
+
 TEST(RepeatedField, MutableDataIsMutable) {
   RepeatedField<int> field;
   field.Add(1);
@@ -783,13 +908,6 @@ TEST(RepeatedPtrField, MergeFrom) {
   EXPECT_EQ("5", destination.Get(4));
 }
 
-#ifdef PROTOBUF_HAS_DEATH_TEST
-TEST(RepeatedPtrField, MergeFromSelf) {
-  RepeatedPtrField<string> me;
-  me.Add()->assign("1");
-  EXPECT_DEATH(me.MergeFrom(me), "");
-}
-#endif  // PROTOBUF_HAS_DEATH_TEST
 
 TEST(RepeatedPtrField, CopyFrom) {
   RepeatedPtrField<string> source, destination;
@@ -923,6 +1041,138 @@ TEST(RepeatedPtrField, SelfAssign) {
   EXPECT_EQ("8", source.Get(1));
 }
 
+TEST(RepeatedPtrField, MoveConstruct) {
+  {
+    RepeatedPtrField<string> source;
+    *source.Add() = "1";
+    *source.Add() = "2";
+    const string* const* data = source.data();
+    RepeatedPtrField<string> destination = std::move(source);
+    EXPECT_EQ(data, destination.data());
+    EXPECT_THAT(destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_TRUE(source.empty());
+  }
+  {
+    Arena arena;
+    RepeatedPtrField<string>* source =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *source->Add() = "1";
+    *source->Add() = "2";
+    RepeatedPtrField<string> destination = std::move(*source);
+    EXPECT_EQ(nullptr, destination.GetArena());
+    EXPECT_THAT(destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre("1", "2"));
+  }
+}
+
+TEST(RepeatedPtrField, MoveAssign) {
+  {
+    RepeatedPtrField<string> source;
+    *source.Add() = "1";
+    *source.Add() = "2";
+    RepeatedPtrField<string> destination;
+    *destination.Add() = "3";
+    const string* const* source_data = source.data();
+    const string* const* destination_data = destination.data();
+    destination = std::move(source);
+    EXPECT_EQ(source_data, destination.data());
+    EXPECT_THAT(destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_EQ(destination_data, source.data());
+    EXPECT_THAT(source, ElementsAre("3"));
+  }
+  {
+    Arena arena;
+    RepeatedPtrField<string>* source =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *source->Add() = "1";
+    *source->Add() = "2";
+    RepeatedPtrField<string>* destination =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *destination->Add() = "3";
+    const string* const* source_data = source->data();
+    const string* const* destination_data = destination->data();
+    *destination = std::move(*source);
+    EXPECT_EQ(source_data, destination->data());
+    EXPECT_THAT(*destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_EQ(destination_data, source->data());
+    EXPECT_THAT(*source, ElementsAre("3"));
+  }
+  {
+    Arena source_arena;
+    RepeatedPtrField<string>* source =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&source_arena);
+    *source->Add() = "1";
+    *source->Add() = "2";
+    Arena destination_arena;
+    RepeatedPtrField<string>* destination =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&destination_arena);
+    *destination->Add() = "3";
+    *destination = std::move(*source);
+    EXPECT_THAT(*destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre("1", "2"));
+  }
+  {
+    Arena arena;
+    RepeatedPtrField<string>* source =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *source->Add() = "1";
+    *source->Add() = "2";
+    RepeatedPtrField<string> destination;
+    *destination.Add() = "3";
+    destination = std::move(*source);
+    EXPECT_THAT(destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(*source, ElementsAre("1", "2"));
+  }
+  {
+    RepeatedPtrField<string> source;
+    *source.Add() = "1";
+    *source.Add() = "2";
+    Arena arena;
+    RepeatedPtrField<string>* destination =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *destination->Add() = "3";
+    *destination = std::move(source);
+    EXPECT_THAT(*destination, ElementsAre("1", "2"));
+    // This property isn't guaranteed but it's useful to have a test that would
+    // catch changes in this area.
+    EXPECT_THAT(source, ElementsAre("1", "2"));
+  }
+  {
+    RepeatedPtrField<string> field;
+    // An alias to defeat -Wself-move.
+    RepeatedPtrField<string>& alias = field;
+    *field.Add() = "1";
+    *field.Add() = "2";
+    const string* const* data = field.data();
+    field = std::move(alias);
+    EXPECT_EQ(data, field.data());
+    EXPECT_THAT(field, ElementsAre("1", "2"));
+  }
+  {
+    Arena arena;
+    RepeatedPtrField<string>* field =
+        Arena::CreateMessage<RepeatedPtrField<string>>(&arena);
+    *field->Add() = "1";
+    *field->Add() = "2";
+    const string* const* data = field->data();
+    *field = std::move(*field);
+    EXPECT_EQ(data, field->data());
+    EXPECT_THAT(*field, ElementsAre("1", "2"));
+  }
+}
+
 TEST(RepeatedPtrField, MutableDataIsMutable) {
   RepeatedPtrField<string> field;
   *field.Add() = "1";
@@ -1586,6 +1836,36 @@ TEST_F(RepeatedFieldInsertionIteratorsTest,
   EXPECT_EQ(testproto.DebugString(), goldenproto.DebugString());
 }
 
+TEST_F(RepeatedFieldInsertionIteratorsTest, MoveStrings) {
+  std::vector<string> src = {"a", "b", "c", "d"};
+  std::vector<string> copy = src;  // copy since move leaves in undefined state
+  TestAllTypes testproto;
+  std::move(copy.begin(), copy.end(),
+            RepeatedFieldBackInserter(testproto.mutable_repeated_string()));
+
+  ASSERT_THAT(testproto.repeated_string(), testing::ElementsAreArray(src));
+}
+
+TEST_F(RepeatedFieldInsertionIteratorsTest, MoveProtos) {
+  auto make_nested = [](int32 x) {
+    Nested ret;
+    ret.set_bb(x);
+    return ret;
+  };
+  std::vector<Nested> src = {make_nested(3), make_nested(5), make_nested(7)};
+  std::vector<Nested> copy = src;  // copy since move leaves in undefined state
+  TestAllTypes testproto;
+  std::move(
+      copy.begin(), copy.end(),
+      RepeatedFieldBackInserter(testproto.mutable_repeated_nested_message()));
+
+  ASSERT_EQ(src.size(), testproto.repeated_nested_message_size());
+  for (int i = 0; i < src.size(); ++i) {
+    EXPECT_EQ(src[i].DebugString(),
+              testproto.repeated_nested_message(i).DebugString());
+  }
+}
+
 }  // namespace
 
 }  // namespace protobuf
diff --git a/src/google/protobuf/source_context.pb.cc b/src/google/protobuf/source_context.pb.cc
index 50e17da1..739172f8 100644
--- a/src/google/protobuf/source_context.pb.cc
+++ b/src/google/protobuf/source_context.pb.cc
@@ -1,94 +1,91 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/source_context.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class SourceContextDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<SourceContext> {
+class SourceContextDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<SourceContext>
+      _instance;
 } _SourceContext_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto {
+static void InitDefaultsSourceContext() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_SourceContext_default_instance_;
+    new (ptr) ::google::protobuf::SourceContext();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::SourceContext::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_SourceContext =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsSourceContext}, {}};
 
-::google::protobuf::Metadata file_level_metadata[1];
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_SourceContext.base);
+}
 
-}  // namespace
+::google::protobuf::Metadata file_level_metadata[1];
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceContext, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceContext, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(SourceContext, file_name_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::SourceContext, file_name_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(SourceContext)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::SourceContext)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_SourceContext_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_SourceContext_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/source_context.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/source_context.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _SourceContext_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _SourceContext_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n$google/protobuf/source_context.proto\022\017"
       "google.protobuf\"\"\n\rSourceContext\022\021\n\tfile"
       "_name\030\001 \001(\tB\225\001\n\023com.google.protobufB\022Sou"
@@ -101,41 +98,40 @@ void AddDescriptorsImpl() {
       descriptor, 251);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/source_context.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void SourceContext::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int SourceContext::kFileNameFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 SourceContext::SourceContext()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::scc_info_SourceContext.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.SourceContext)
 }
 SourceContext::SourceContext(const SourceContext& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   file_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.file_name().size() > 0) {
@@ -146,7 +142,6 @@ SourceContext::SourceContext(const SourceContext& from)
 
 void SourceContext::SharedCtor() {
   file_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _cached_size_ = 0;
 }
 
 SourceContext::~SourceContext() {
@@ -159,31 +154,27 @@ void SourceContext::SharedDtor() {
 }
 
 void SourceContext::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* SourceContext::descriptor() {
-  protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const SourceContext& SourceContext::default_instance() {
-  protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::scc_info_SourceContext.base);
   return *internal_default_instance();
 }
 
-SourceContext* SourceContext::New(::google::protobuf::Arena* arena) const {
-  SourceContext* n = new SourceContext;
-  if (arena != NULL) {
-    arena->Own(n);
-  }
-  return n;
-}
 
 void SourceContext::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.SourceContext)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   file_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  _internal_metadata_.Clear();
 }
 
 bool SourceContext::MergePartialFromCodedStream(
@@ -192,18 +183,18 @@ bool SourceContext::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.SourceContext)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string file_name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_file_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->file_name().data(), this->file_name().length(),
+            this->file_name().data(), static_cast<int>(this->file_name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.SourceContext.file_name"));
         } else {
@@ -214,12 +205,11 @@ bool SourceContext::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -236,27 +226,37 @@ failure:
 void SourceContext::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.SourceContext)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string file_name = 1;
   if (this->file_name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->file_name().data(), this->file_name().length(),
+      this->file_name().data(), static_cast<int>(this->file_name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.SourceContext.file_name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
       1, this->file_name(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.SourceContext)
 }
 
 ::google::protobuf::uint8* SourceContext::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.SourceContext)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string file_name = 1;
   if (this->file_name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->file_name().data(), this->file_name().length(),
+      this->file_name().data(), static_cast<int>(this->file_name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.SourceContext.file_name");
     target =
@@ -264,6 +264,10 @@ void SourceContext::SerializeWithCachedSizes(
         1, this->file_name(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.SourceContext)
   return target;
 }
@@ -272,6 +276,11 @@ size_t SourceContext::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.SourceContext)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // string file_name = 1;
   if (this->file_name().size() > 0) {
     total_size += 1 +
@@ -280,9 +289,7 @@ size_t SourceContext::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -305,6 +312,9 @@ void SourceContext::MergeFrom(const SourceContext& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.SourceContext)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.file_name().size() > 0) {
 
     file_name_.AssignWithDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), from.file_name_);
@@ -334,74 +344,26 @@ void SourceContext::Swap(SourceContext* other) {
   InternalSwap(other);
 }
 void SourceContext::InternalSwap(SourceContext* other) {
-  file_name_.Swap(&other->file_name_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  file_name_.Swap(&other->file_name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata SourceContext::GetMetadata() const {
   protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// SourceContext
-
-// string file_name = 1;
-void SourceContext::clear_file_name() {
-  file_name_.ClearToEmptyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-const ::std::string& SourceContext::file_name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.SourceContext.file_name)
-  return file_name_.GetNoArena();
-}
-void SourceContext::set_file_name(const ::std::string& value) {
-  
-  file_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value);
-  // @@protoc_insertion_point(field_set:google.protobuf.SourceContext.file_name)
-}
-#if LANG_CXX11
-void SourceContext::set_file_name(::std::string&& value) {
-  
-  file_name_.SetNoArena(
-    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value));
-  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.SourceContext.file_name)
-}
-#endif
-void SourceContext::set_file_name(const char* value) {
-  
-  file_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
-  // @@protoc_insertion_point(field_set_char:google.protobuf.SourceContext.file_name)
-}
-void SourceContext::set_file_name(const char* value, size_t size) {
-  
-  file_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(reinterpret_cast<const char*>(value), size));
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.SourceContext.file_name)
-}
-::std::string* SourceContext::mutable_file_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.SourceContext.file_name)
-  return file_name_.MutableNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-::std::string* SourceContext::release_file_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.SourceContext.file_name)
-  
-  return file_name_.ReleaseNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-}
-void SourceContext::set_allocated_file_name(::std::string* file_name) {
-  if (file_name != NULL) {
-    
-  } else {
-    
-  }
-  file_name_.SetAllocatedNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), file_name);
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceContext.file_name)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::SourceContext* Arena::CreateMaybeMessage< ::google::protobuf::SourceContext >(Arena* arena) {
+  return Arena::CreateInternal< ::google::protobuf::SourceContext >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/source_context.pb.h b/src/google/protobuf/source_context.pb.h
index 10888385..16ed21ca 100644
--- a/src/google/protobuf/source_context.pb.h
+++ b/src/google/protobuf/source_context.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/source_context.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fsource_5fcontext_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fsource_5fcontext_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fsource_5fcontext_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fsource_5fcontext_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto
 namespace google {
 namespace protobuf {
 class SourceContext;
@@ -36,20 +52,13 @@ class SourceContextDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern SourceContextDefaultTypeInternal _SourceContext_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::SourceContext* Arena::CreateMaybeMessage<::google::protobuf::SourceContext>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -64,46 +73,66 @@ class LIBPROTOBUF_EXPORT SourceContext : public ::google::protobuf::Message /* @
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  SourceContext(SourceContext&& from) noexcept
+    : SourceContext() {
+    *this = ::std::move(from);
+  }
 
+  inline SourceContext& operator=(SourceContext&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
   static const ::google::protobuf::Descriptor* descriptor();
   static const SourceContext& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const SourceContext* internal_default_instance() {
     return reinterpret_cast<const SourceContext*>(
                &_SourceContext_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void Swap(SourceContext* other);
+  friend void swap(SourceContext& a, SourceContext& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline SourceContext* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline SourceContext* New() const final {
+    return CreateMaybeMessage<SourceContext>(NULL);
+  }
 
-  SourceContext* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  SourceContext* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<SourceContext>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const SourceContext& from);
   void MergeFrom(const SourceContext& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(SourceContext* other);
   private:
   inline ::google::protobuf::Arena* GetArenaNoVirtual() const {
@@ -114,7 +143,7 @@ class LIBPROTOBUF_EXPORT SourceContext : public ::google::protobuf::Message /* @
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -139,15 +168,18 @@ class LIBPROTOBUF_EXPORT SourceContext : public ::google::protobuf::Message /* @
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
   ::google::protobuf::internal::ArenaStringPtr file_name_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // SourceContext
 
 // string file_name = 1;
@@ -172,6 +204,7 @@ inline void SourceContext::set_file_name(::std::string&& value) {
 }
 #endif
 inline void SourceContext::set_file_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   file_name_.SetNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value));
   // @@protoc_insertion_point(field_set_char:google.protobuf.SourceContext.file_name)
@@ -202,14 +235,15 @@ inline void SourceContext::set_allocated_file_name(::std::string* file_name) {
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.SourceContext.file_name)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fsource_5fcontext_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fsource_5fcontext_2eproto
diff --git a/src/google/protobuf/struct.pb.cc b/src/google/protobuf/struct.pb.cc
index a1aa51ec..8f2d4848 100644
--- a/src/google/protobuf/struct.pb.cc
+++ b/src/google/protobuf/struct.pb.cc
@@ -1,28 +1,43 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/struct.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
+namespace protobuf_google_2fprotobuf_2fstruct_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fstruct_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_ListValue;
+}  // namespace protobuf_google_2fprotobuf_2fstruct_2eproto
 namespace google {
 namespace protobuf {
-class StructDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Struct> {
+class Struct_FieldsEntry_DoNotUseDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Struct_FieldsEntry_DoNotUse>
+      _instance;
+} _Struct_FieldsEntry_DoNotUse_default_instance_;
+class StructDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Struct>
+      _instance;
 } _Struct_default_instance_;
-class ValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Value> {
-  public:
+class ValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Value>
+      _instance;
   int null_value_;
   double number_value_;
   ::google::protobuf::internal::ArenaStringPtr string_value_;
@@ -30,122 +45,122 @@ class ValueDefaultTypeInternal : public ::google::protobuf::internal::Explicitly
   const ::google::protobuf::Struct* struct_value_;
   const ::google::protobuf::ListValue* list_value_;
 } _Value_default_instance_;
-class ListValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<ListValue> {
+class ListValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<ListValue>
+      _instance;
 } _ListValue_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fstruct_2eproto {
+static void InitDefaultsListValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Struct_FieldsEntry_DoNotUse_default_instance_;
+    new (ptr) ::google::protobuf::Struct_FieldsEntry_DoNotUse();
+  }
+  {
+    void* ptr = &::google::protobuf::_Struct_default_instance_;
+    new (ptr) ::google::protobuf::Struct();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  {
+    void* ptr = &::google::protobuf::_Value_default_instance_;
+    new (ptr) ::google::protobuf::Value();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  {
+    void* ptr = &::google::protobuf::_ListValue_default_instance_;
+    new (ptr) ::google::protobuf::ListValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Struct_FieldsEntry_DoNotUse::InitAsDefaultInstance();
+  ::google::protobuf::Struct::InitAsDefaultInstance();
+  ::google::protobuf::Value::InitAsDefaultInstance();
+  ::google::protobuf::ListValue::InitAsDefaultInstance();
+}
 
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_ListValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsListValue}, {}};
 
-namespace {
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_ListValue.base);
+}
 
 ::google::protobuf::Metadata file_level_metadata[4];
 const ::google::protobuf::EnumDescriptor* file_level_enum_descriptors[1];
 
-}  // namespace
-
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct_FieldsEntry_DoNotUse, _has_bits_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct_FieldsEntry_DoNotUse, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct_FieldsEntry_DoNotUse, key_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct_FieldsEntry_DoNotUse, value_),
+  0,
+  1,
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Struct, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Struct, fields_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Struct, fields_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Value, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Value, _internal_metadata_),
   ~0u,  // no _extensions_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Value, _oneof_case_[0]),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), null_value_),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), number_value_),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), string_value_),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), bool_value_),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), struct_value_),
-  PROTO2_GENERATED_DEFAULT_ONEOF_FIELD_OFFSET((&_Value_default_instance_), list_value_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Value, kind_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Value, _oneof_case_[0]),
+  ~0u,  // no _weak_field_map_
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, null_value_),
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, number_value_),
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, string_value_),
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, bool_value_),
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, struct_value_),
+  offsetof(::google::protobuf::ValueDefaultTypeInternal, list_value_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Value, kind_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ListValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ListValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(ListValue, values_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::ListValue, values_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Struct)},
-  { 5, -1, sizeof(Value)},
-  { 16, -1, sizeof(ListValue)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, 7, sizeof(::google::protobuf::Struct_FieldsEntry_DoNotUse)},
+  { 9, -1, sizeof(::google::protobuf::Struct)},
+  { 15, -1, sizeof(::google::protobuf::Value)},
+  { 27, -1, sizeof(::google::protobuf::ListValue)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Struct_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Value_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_ListValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Struct_FieldsEntry_DoNotUse_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Struct_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Value_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_ListValue_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/struct.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/struct.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, file_level_enum_descriptors, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 4);
-  const ::google::protobuf::Descriptor* Struct_FieldsEntry_descriptor = protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[0].descriptor;
-  ::google::protobuf::MessageFactory::InternalRegisterGeneratedMessage(
-        Struct_FieldsEntry_descriptor,
-        ::google::protobuf::internal::MapEntry<
-            ::std::string,
-            ::google::protobuf::Value,
-            ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
-            ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
-            0>::CreateDefaultInstance(
-                Struct_FieldsEntry_descriptor));
-}
-
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Struct_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _Value_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-  _ListValue_default_instance_.Shutdown();
-  delete file_level_metadata[3].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _Struct_default_instance_.DefaultConstruct();
-  _Value_default_instance_.DefaultConstruct();
-  _ListValue_default_instance_.DefaultConstruct();
-  _Value_default_instance_.null_value_ = 0;
-  _Value_default_instance_.number_value_ = 0;
-  _Value_default_instance_.string_value_.UnsafeSetDefault(
-      &::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _Value_default_instance_.bool_value_ = false;
-  _Value_default_instance_.struct_value_ = const_cast< ::google::protobuf::Struct*>(
-      ::google::protobuf::Struct::internal_default_instance());
-  _Value_default_instance_.list_value_ = const_cast< ::google::protobuf::ListValue*>(
-      ::google::protobuf::ListValue::internal_default_instance());
 }
 
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\034google/protobuf/struct.proto\022\017google.p"
       "rotobuf\"\204\001\n\006Struct\0223\n\006fields\030\001 \003(\0132#.goo"
       "gle.protobuf.Struct.FieldsEntry\032E\n\013Field"
@@ -168,22 +183,21 @@ void AddDescriptorsImpl() {
       descriptor, 641);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/struct.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fstruct_2eproto
-
+namespace google {
+namespace protobuf {
 const ::google::protobuf::EnumDescriptor* NullValue_descriptor() {
   protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
   return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_enum_descriptors[0];
@@ -200,20 +214,33 @@ bool NullValue_IsValid(int value) {
 
 // ===================================================================
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
+Struct_FieldsEntry_DoNotUse::Struct_FieldsEntry_DoNotUse() {}
+Struct_FieldsEntry_DoNotUse::Struct_FieldsEntry_DoNotUse(::google::protobuf::Arena* arena) : SuperType(arena) {}
+void Struct_FieldsEntry_DoNotUse::MergeFrom(const Struct_FieldsEntry_DoNotUse& other) {
+  MergeFromInternal(other);
+}
+::google::protobuf::Metadata Struct_FieldsEntry_DoNotUse::GetMetadata() const {
+  ::protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[0];
+}
+void Struct_FieldsEntry_DoNotUse::MergeFrom(
+    const ::google::protobuf::Message& other) {
+  ::google::protobuf::Message::MergeFrom(other);
+}
+
 
 // ===================================================================
 
+void Struct::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Struct::kFieldsFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 Struct::Struct()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Struct)
 }
@@ -221,34 +248,20 @@ Struct::Struct(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena),
   fields_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Struct)
 }
 Struct::Struct(const Struct& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
-  const ::google::protobuf::Descriptor*& Struct_FieldsEntry_descriptor = protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[0].descriptor;
-  fields_.SetAssignDescriptorCallback(
-      protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce);
-  fields_.SetEntryDescriptor(
-      &Struct_FieldsEntry_descriptor);
   fields_.MergeFrom(from.fields_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Struct)
 }
 
 void Struct::SharedCtor() {
-  const ::google::protobuf::Descriptor*& Struct_FieldsEntry_descriptor = protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[0].descriptor;
-  fields_.SetAssignDescriptorCallback(
-      protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce);
-  fields_.SetEntryDescriptor(
-      &Struct_FieldsEntry_descriptor);
-  _cached_size_ = 0;
 }
 
 Struct::~Struct() {
@@ -257,11 +270,7 @@ Struct::~Struct() {
 }
 
 void Struct::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Struct::ArenaDtor(void* object) {
@@ -271,27 +280,27 @@ void Struct::ArenaDtor(void* object) {
 void Struct::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Struct::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Struct::descriptor() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Struct& Struct::default_instance() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   return *internal_default_instance();
 }
 
-Struct* Struct::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Struct>(arena);
-}
 
 void Struct::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Struct)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   fields_.Clear();
+  _internal_metadata_.Clear();
 }
 
 bool Struct::MergePartialFromCodedStream(
@@ -300,16 +309,16 @@ bool Struct::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Struct)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // map<string, .google.protobuf.Value> fields = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
-          DO_(input->IncrementRecursionDepth());
-          Struct_FieldsEntry::Parser< ::google::protobuf::internal::MapField<
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
+          Struct_FieldsEntry_DoNotUse::Parser< ::google::protobuf::internal::MapField<
+              Struct_FieldsEntry_DoNotUse,
               ::std::string, ::google::protobuf::Value,
               ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
               ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
@@ -318,24 +327,22 @@ bool Struct::MergePartialFromCodedStream(
           DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
               input, &parser));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            parser.key().data(), parser.key().length(),
+            parser.key().data(), static_cast<int>(parser.key().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Struct.FieldsEntry.key"));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -352,6 +359,9 @@ failure:
 void Struct::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Struct)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // map<string, .google.protobuf.Value> fields = 1;
   if (!this->fields().empty()) {
     typedef ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_pointer
@@ -361,7 +371,7 @@ void Struct::SerializeWithCachedSizes(
     struct Utf8Check {
       static void Check(ConstPtr p) {
         ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-          p->first.data(), p->first.length(),
+          p->first.data(), static_cast<int>(p->first.length()),
           ::google::protobuf::internal::WireFormatLite::SERIALIZE,
           "google.protobuf.Struct.FieldsEntry.key");
       }
@@ -369,29 +379,29 @@ void Struct::SerializeWithCachedSizes(
 
     if (output->IsSerializationDeterministic() &&
         this->fields().size() > 1) {
-      ::google::protobuf::scoped_array<SortItem> items(
+      ::std::unique_ptr<SortItem[]> items(
           new SortItem[this->fields().size()]);
       typedef ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::size_type size_type;
       size_type n = 0;
       for (::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_iterator
           it = this->fields().begin();
           it != this->fields().end(); ++it, ++n) {
-        items[n] = SortItem(&*it);
+        items[static_cast<ptrdiff_t>(n)] = SortItem(&*it);
       }
-      ::std::sort(&items[0], &items[n], Less());
-      ::google::protobuf::scoped_ptr<Struct_FieldsEntry> entry;
+      ::std::sort(&items[0], &items[static_cast<ptrdiff_t>(n)], Less());
+      ::std::unique_ptr<Struct_FieldsEntry_DoNotUse> entry;
       for (size_type i = 0; i < n; i++) {
         entry.reset(fields_.NewEntryWrapper(
-            items[i]->first, items[i]->second));
+            items[static_cast<ptrdiff_t>(i)]->first, items[static_cast<ptrdiff_t>(i)]->second));
         ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
             1, *entry, output);
         if (entry->GetArena() != NULL) {
           entry.release();
         }
-        Utf8Check::Check(items[i]);
+        Utf8Check::Check(items[static_cast<ptrdiff_t>(i)]);
       }
     } else {
-      ::google::protobuf::scoped_ptr<Struct_FieldsEntry> entry;
+      ::std::unique_ptr<Struct_FieldsEntry_DoNotUse> entry;
       for (::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_iterator
           it = this->fields().begin();
           it != this->fields().end(); ++it) {
@@ -407,13 +417,20 @@ void Struct::SerializeWithCachedSizes(
     }
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Struct)
 }
 
 ::google::protobuf::uint8* Struct::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Struct)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // map<string, .google.protobuf.Value> fields = 1;
   if (!this->fields().empty()) {
     typedef ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_pointer
@@ -423,7 +440,7 @@ void Struct::SerializeWithCachedSizes(
     struct Utf8Check {
       static void Check(ConstPtr p) {
         ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-          p->first.data(), p->first.length(),
+          p->first.data(), static_cast<int>(p->first.length()),
           ::google::protobuf::internal::WireFormatLite::SERIALIZE,
           "google.protobuf.Struct.FieldsEntry.key");
       }
@@ -431,20 +448,20 @@ void Struct::SerializeWithCachedSizes(
 
     if (deterministic &&
         this->fields().size() > 1) {
-      ::google::protobuf::scoped_array<SortItem> items(
+      ::std::unique_ptr<SortItem[]> items(
           new SortItem[this->fields().size()]);
       typedef ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::size_type size_type;
       size_type n = 0;
       for (::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_iterator
           it = this->fields().begin();
           it != this->fields().end(); ++it, ++n) {
-        items[n] = SortItem(&*it);
+        items[static_cast<ptrdiff_t>(n)] = SortItem(&*it);
       }
-      ::std::sort(&items[0], &items[n], Less());
-      ::google::protobuf::scoped_ptr<Struct_FieldsEntry> entry;
+      ::std::sort(&items[0], &items[static_cast<ptrdiff_t>(n)], Less());
+      ::std::unique_ptr<Struct_FieldsEntry_DoNotUse> entry;
       for (size_type i = 0; i < n; i++) {
         entry.reset(fields_.NewEntryWrapper(
-            items[i]->first, items[i]->second));
+            items[static_cast<ptrdiff_t>(i)]->first, items[static_cast<ptrdiff_t>(i)]->second));
         target = ::google::protobuf::internal::WireFormatLite::
                    InternalWriteMessageNoVirtualToArray(
                        1, *entry, deterministic, target);
@@ -452,10 +469,10 @@ void Struct::SerializeWithCachedSizes(
         if (entry->GetArena() != NULL) {
           entry.release();
         }
-        Utf8Check::Check(items[i]);
+        Utf8Check::Check(items[static_cast<ptrdiff_t>(i)]);
       }
     } else {
-      ::google::protobuf::scoped_ptr<Struct_FieldsEntry> entry;
+      ::std::unique_ptr<Struct_FieldsEntry_DoNotUse> entry;
       for (::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_iterator
           it = this->fields().begin();
           it != this->fields().end(); ++it) {
@@ -473,6 +490,10 @@ void Struct::SerializeWithCachedSizes(
     }
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Struct)
   return target;
 }
@@ -481,11 +502,16 @@ size_t Struct::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Struct)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // map<string, .google.protobuf.Value> fields = 1;
   total_size += 1 *
       ::google::protobuf::internal::FromIntSize(this->fields_size());
   {
-    ::google::protobuf::scoped_ptr<Struct_FieldsEntry> entry;
+    ::std::unique_ptr<Struct_FieldsEntry_DoNotUse> entry;
     for (::google::protobuf::Map< ::std::string, ::google::protobuf::Value >::const_iterator
         it = this->fields().begin();
         it != this->fields().end(); ++it) {
@@ -502,9 +528,7 @@ size_t Struct::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -527,6 +551,9 @@ void Struct::MergeFrom(const Struct& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Struct)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   fields_.MergeFrom(from.fields_);
 }
 
@@ -568,40 +595,60 @@ void Struct::UnsafeArenaSwap(Struct* other) {
   InternalSwap(other);
 }
 void Struct::InternalSwap(Struct* other) {
+  using std::swap;
   fields_.Swap(&other->fields_);
-  std::swap(_cached_size_, other->_cached_size_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Struct::GetMetadata() const {
   protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[1];
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Struct
 
-// map<string, .google.protobuf.Value> fields = 1;
-int Struct::fields_size() const {
-  return fields_.size();
-}
-void Struct::clear_fields() {
-  fields_.Clear();
+// ===================================================================
+
+void Value::InitAsDefaultInstance() {
+  ::google::protobuf::_Value_default_instance_.null_value_ = 0;
+  ::google::protobuf::_Value_default_instance_.number_value_ = 0;
+  ::google::protobuf::_Value_default_instance_.string_value_.UnsafeSetDefault(
+      &::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  ::google::protobuf::_Value_default_instance_.bool_value_ = false;
+  ::google::protobuf::_Value_default_instance_.struct_value_ = const_cast< ::google::protobuf::Struct*>(
+      ::google::protobuf::Struct::internal_default_instance());
+  ::google::protobuf::_Value_default_instance_.list_value_ = const_cast< ::google::protobuf::ListValue*>(
+      ::google::protobuf::ListValue::internal_default_instance());
 }
- const ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >&
-Struct::fields() const {
-  // @@protoc_insertion_point(field_map:google.protobuf.Struct.fields)
-  return fields_.GetMap();
+void Value::set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  clear_kind();
+  if (struct_value) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(struct_value);
+    if (message_arena != submessage_arena) {
+      struct_value = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, struct_value, submessage_arena);
+    }
+    set_has_struct_value();
+    kind_.struct_value_ = struct_value;
+  }
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.struct_value)
 }
- ::google::protobuf::Map< ::std::string, ::google::protobuf::Value >*
-Struct::mutable_fields() {
-  // @@protoc_insertion_point(field_mutable_map:google.protobuf.Struct.fields)
-  return fields_.MutableMap();
+void Value::set_allocated_list_value(::google::protobuf::ListValue* list_value) {
+  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
+  clear_kind();
+  if (list_value) {
+    ::google::protobuf::Arena* submessage_arena =
+      ::google::protobuf::Arena::GetArena(list_value);
+    if (message_arena != submessage_arena) {
+      list_value = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, list_value, submessage_arena);
+    }
+    set_has_list_value();
+    kind_.list_value_ = list_value;
+  }
+  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.list_value)
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// ===================================================================
-
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Value::kNullValueFieldNumber;
 const int Value::kNumberValueFieldNumber;
@@ -613,26 +660,22 @@ const int Value::kListValueFieldNumber;
 
 Value::Value()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Value)
 }
 Value::Value(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Value)
 }
 Value::Value(const Value& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   clear_has_kind();
   switch (from.kind_case()) {
@@ -669,7 +712,6 @@ Value::Value(const Value& from)
 
 void Value::SharedCtor() {
   clear_has_kind();
-  _cached_size_ = 0;
 }
 
 Value::~Value() {
@@ -678,11 +720,7 @@ Value::~Value() {
 }
 
 void Value::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
   if (has_kind()) {
     clear_kind();
   }
@@ -695,23 +733,18 @@ void Value::ArenaDtor(void* object) {
 void Value::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Value::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Value::descriptor() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Value& Value::default_instance() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   return *internal_default_instance();
 }
 
-Value* Value::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Value>(arena);
-}
 
 void Value::clear_kind() {
 // @@protoc_insertion_point(one_of_clear_start:google.protobuf.Value)
@@ -755,7 +788,12 @@ void Value::clear_kind() {
 
 void Value::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   clear_kind();
+  _internal_metadata_.Clear();
 }
 
 bool Value::MergePartialFromCodedStream(
@@ -764,14 +802,14 @@ bool Value::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Value)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // .google.protobuf.NullValue null_value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -786,7 +824,7 @@ bool Value::MergePartialFromCodedStream(
       // double number_value = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(17u)) {
+            static_cast< ::google::protobuf::uint8>(17u /* 17 & 0xFF */)) {
           clear_kind();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    double, ::google::protobuf::internal::WireFormatLite::TYPE_DOUBLE>(
@@ -801,11 +839,11 @@ bool Value::MergePartialFromCodedStream(
       // string string_value = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_string_value()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->string_value().data(), this->string_value().length(),
+            this->string_value().data(), static_cast<int>(this->string_value().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Value.string_value"));
         } else {
@@ -817,7 +855,7 @@ bool Value::MergePartialFromCodedStream(
       // bool bool_value = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(32u)) {
+            static_cast< ::google::protobuf::uint8>(32u /* 32 & 0xFF */)) {
           clear_kind();
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -832,8 +870,8 @@ bool Value::MergePartialFromCodedStream(
       // .google.protobuf.Struct struct_value = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(42u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_struct_value()));
         } else {
           goto handle_unusual;
@@ -844,8 +882,8 @@ bool Value::MergePartialFromCodedStream(
       // .google.protobuf.ListValue list_value = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_list_value()));
         } else {
           goto handle_unusual;
@@ -855,12 +893,11 @@ bool Value::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -877,6 +914,9 @@ failure:
 void Value::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // .google.protobuf.NullValue null_value = 1;
   if (has_null_value()) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
@@ -891,7 +931,7 @@ void Value::SerializeWithCachedSizes(
   // string string_value = 3;
   if (has_string_value()) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->string_value().data(), this->string_value().length(),
+      this->string_value().data(), static_cast<int>(this->string_value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Value.string_value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -906,22 +946,29 @@ void Value::SerializeWithCachedSizes(
   // .google.protobuf.Struct struct_value = 5;
   if (has_struct_value()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      5, *kind_.struct_value_, output);
+      5, this->_internal_struct_value(), output);
   }
 
   // .google.protobuf.ListValue list_value = 6;
   if (has_list_value()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      6, *kind_.list_value_, output);
+      6, this->_internal_list_value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Value)
 }
 
 ::google::protobuf::uint8* Value::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // .google.protobuf.NullValue null_value = 1;
   if (has_null_value()) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
@@ -936,7 +983,7 @@ void Value::SerializeWithCachedSizes(
   // string string_value = 3;
   if (has_string_value()) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->string_value().data(), this->string_value().length(),
+      this->string_value().data(), static_cast<int>(this->string_value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Value.string_value");
     target =
@@ -952,17 +999,21 @@ void Value::SerializeWithCachedSizes(
   // .google.protobuf.Struct struct_value = 5;
   if (has_struct_value()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        5, *kind_.struct_value_, false, target);
+      InternalWriteMessageToArray(
+        5, this->_internal_struct_value(), deterministic, target);
   }
 
   // .google.protobuf.ListValue list_value = 6;
   if (has_list_value()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        6, *kind_.list_value_, false, target);
+      InternalWriteMessageToArray(
+        6, this->_internal_list_value(), deterministic, target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Value)
   return target;
 }
@@ -971,6 +1022,11 @@ size_t Value::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Value)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   switch (kind_case()) {
     // .google.protobuf.NullValue null_value = 1;
     case kNullValue: {
@@ -998,14 +1054,14 @@ size_t Value::ByteSizeLong() const {
     // .google.protobuf.Struct struct_value = 5;
     case kStructValue: {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
           *kind_.struct_value_);
       break;
     }
     // .google.protobuf.ListValue list_value = 6;
     case kListValue: {
       total_size += 1 +
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
           *kind_.list_value_);
       break;
     }
@@ -1014,9 +1070,7 @@ size_t Value::ByteSizeLong() const {
     }
   }
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1039,6 +1093,9 @@ void Value::MergeFrom(const Value& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Value)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   switch (from.kind_case()) {
     case kNullValue: {
       set_null_value(from.null_value());
@@ -1108,413 +1165,30 @@ void Value::UnsafeArenaSwap(Value* other) {
   InternalSwap(other);
 }
 void Value::InternalSwap(Value* other) {
-  std::swap(kind_, other->kind_);
-  std::swap(_oneof_case_[0], other->_oneof_case_[0]);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(kind_, other->kind_);
+  swap(_oneof_case_[0], other->_oneof_case_[0]);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Value::GetMetadata() const {
   protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[2];
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Value
-
-// .google.protobuf.NullValue null_value = 1;
-bool Value::has_null_value() const {
-  return kind_case() == kNullValue;
-}
-void Value::set_has_null_value() {
-  _oneof_case_[0] = kNullValue;
-}
-void Value::clear_null_value() {
-  if (has_null_value()) {
-    kind_.null_value_ = 0;
-    clear_has_kind();
-  }
-}
-::google::protobuf::NullValue Value::null_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.null_value)
-  if (has_null_value()) {
-    return static_cast< ::google::protobuf::NullValue >(kind_.null_value_);
-  }
-  return static_cast< ::google::protobuf::NullValue >(0);
-}
-void Value::set_null_value(::google::protobuf::NullValue value) {
-  if (!has_null_value()) {
-    clear_kind();
-    set_has_null_value();
-  }
-  kind_.null_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Value.null_value)
-}
-
-// double number_value = 2;
-bool Value::has_number_value() const {
-  return kind_case() == kNumberValue;
-}
-void Value::set_has_number_value() {
-  _oneof_case_[0] = kNumberValue;
-}
-void Value::clear_number_value() {
-  if (has_number_value()) {
-    kind_.number_value_ = 0;
-    clear_has_kind();
-  }
-}
-double Value::number_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.number_value)
-  if (has_number_value()) {
-    return kind_.number_value_;
-  }
-  return 0;
-}
-void Value::set_number_value(double value) {
-  if (!has_number_value()) {
-    clear_kind();
-    set_has_number_value();
-  }
-  kind_.number_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Value.number_value)
-}
-
-// string string_value = 3;
-bool Value::has_string_value() const {
-  return kind_case() == kStringValue;
-}
-void Value::set_has_string_value() {
-  _oneof_case_[0] = kStringValue;
-}
-void Value::clear_string_value() {
-  if (has_string_value()) {
-    kind_.string_value_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-        GetArenaNoVirtual());
-    clear_has_kind();
-  }
-}
-const ::std::string& Value::string_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.string_value)
-  if (has_string_value()) {
-    return kind_.string_value_.Get();
-  }
-  return *&::google::protobuf::internal::GetEmptyStringAlreadyInited();
-}
-void Value::set_string_value(const ::std::string& value) {
-  if (!has_string_value()) {
-    clear_kind();
-    set_has_string_value();
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  kind_.string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Value.string_value)
-}
-void Value::set_string_value(const char* value) {
-  if (!has_string_value()) {
-    clear_kind();
-    set_has_string_value();
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  kind_.string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      ::std::string(value), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Value.string_value)
-}
-void Value::set_string_value(const char* value,
-                             size_t size) {
-  if (!has_string_value()) {
-    clear_kind();
-    set_has_string_value();
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  kind_.string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size),
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Value.string_value)
-}
-::std::string* Value::mutable_string_value() {
-  if (!has_string_value()) {
-    clear_kind();
-    set_has_string_value();
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  return kind_.string_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.string_value)
-}
-::std::string* Value::release_string_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Value.string_value)
-  if (has_string_value()) {
-    clear_has_kind();
-    return kind_.string_value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-        GetArenaNoVirtual());
-  } else {
-    return NULL;
-  }
-}
-::std::string* Value::unsafe_arena_release_string_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.string_value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (has_string_value()) {
-    clear_has_kind();
-    return kind_.string_value_.UnsafeArenaRelease(
-        &::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-  } else {
-    return NULL;
-  }
-}
-void Value::set_allocated_string_value(::std::string* string_value) {
-  if (!has_string_value()) {
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  clear_kind();
-  if (string_value != NULL) {
-    set_has_string_value();
-    kind_.string_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), string_value,
-        GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.string_value)
-}
-void Value::unsafe_arena_set_allocated_string_value(::std::string* string_value) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (!has_string_value()) {
-    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  }
-  clear_kind();
-  if (string_value) {
-    set_has_string_value();
-    kind_.string_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), string_value, GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Value.string_value)
-}
-
-// bool bool_value = 4;
-bool Value::has_bool_value() const {
-  return kind_case() == kBoolValue;
-}
-void Value::set_has_bool_value() {
-  _oneof_case_[0] = kBoolValue;
-}
-void Value::clear_bool_value() {
-  if (has_bool_value()) {
-    kind_.bool_value_ = false;
-    clear_has_kind();
-  }
-}
-bool Value::bool_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.bool_value)
-  if (has_bool_value()) {
-    return kind_.bool_value_;
-  }
-  return false;
-}
-void Value::set_bool_value(bool value) {
-  if (!has_bool_value()) {
-    clear_kind();
-    set_has_bool_value();
-  }
-  kind_.bool_value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Value.bool_value)
-}
-
-// .google.protobuf.Struct struct_value = 5;
-bool Value::has_struct_value() const {
-  return kind_case() == kStructValue;
-}
-void Value::set_has_struct_value() {
-  _oneof_case_[0] = kStructValue;
-}
-void Value::clear_struct_value() {
-  if (has_struct_value()) {
-    if (GetArenaNoVirtual() == NULL) {
-      delete kind_.struct_value_;
-    }
-    clear_has_kind();
-  }
-}
- const ::google::protobuf::Struct& Value::struct_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.struct_value)
-  return has_struct_value()
-      ? *kind_.struct_value_
-      : ::google::protobuf::Struct::default_instance();
-}
-::google::protobuf::Struct* Value::mutable_struct_value() {
-  if (!has_struct_value()) {
-    clear_kind();
-    set_has_struct_value();
-    kind_.struct_value_ = 
-      ::google::protobuf::Arena::CreateMessage< ::google::protobuf::Struct >(
-      GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.struct_value)
-  return kind_.struct_value_;
-}
-::google::protobuf::Struct* Value::release_struct_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Value.struct_value)
-  if (has_struct_value()) {
-    clear_has_kind();
-    if (GetArenaNoVirtual() != NULL) {
-      ::google::protobuf::Struct* temp = new ::google::protobuf::Struct(*kind_.struct_value_);
-      kind_.struct_value_ = NULL;
-      return temp;
-    } else {
-      ::google::protobuf::Struct* temp = kind_.struct_value_;
-      kind_.struct_value_ = NULL;
-      return temp;
-    }
-  } else {
-    return NULL;
-  }
-}
-void Value::set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
-  clear_kind();
-  if (struct_value) {
-    if (GetArenaNoVirtual() != NULL &&
-        ::google::protobuf::Arena::GetArena(struct_value) == NULL) {
-      GetArenaNoVirtual()->Own(struct_value);
-    } else if (GetArenaNoVirtual() !=
-               ::google::protobuf::Arena::GetArena(struct_value)) {
-      ::google::protobuf::Struct* new_struct_value = 
-          ::google::protobuf::Arena::CreateMessage< ::google::protobuf::Struct >(
-          GetArenaNoVirtual());
-      new_struct_value->CopyFrom(*struct_value);
-      struct_value = new_struct_value;
-    }
-    set_has_struct_value();
-    kind_.struct_value_ = struct_value;
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.struct_value)
-}
- ::google::protobuf::Struct* Value::unsafe_arena_release_struct_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.struct_value)
-  if (has_struct_value()) {
-    clear_has_kind();
-    ::google::protobuf::Struct* temp = kind_.struct_value_;
-    kind_.struct_value_ = NULL;
-    return temp;
-  } else {
-    return NULL;
-  }
-}
- void Value::unsafe_arena_set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
-  clear_kind();
-  if (struct_value) {
-    set_has_struct_value();
-    kind_.struct_value_ = struct_value;
-  }
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Value.struct_value)
-}
-
-// .google.protobuf.ListValue list_value = 6;
-bool Value::has_list_value() const {
-  return kind_case() == kListValue;
-}
-void Value::set_has_list_value() {
-  _oneof_case_[0] = kListValue;
-}
-void Value::clear_list_value() {
-  if (has_list_value()) {
-    if (GetArenaNoVirtual() == NULL) {
-      delete kind_.list_value_;
-    }
-    clear_has_kind();
-  }
-}
- const ::google::protobuf::ListValue& Value::list_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.list_value)
-  return has_list_value()
-      ? *kind_.list_value_
-      : ::google::protobuf::ListValue::default_instance();
-}
-::google::protobuf::ListValue* Value::mutable_list_value() {
-  if (!has_list_value()) {
-    clear_kind();
-    set_has_list_value();
-    kind_.list_value_ = 
-      ::google::protobuf::Arena::CreateMessage< ::google::protobuf::ListValue >(
-      GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.list_value)
-  return kind_.list_value_;
-}
-::google::protobuf::ListValue* Value::release_list_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Value.list_value)
-  if (has_list_value()) {
-    clear_has_kind();
-    if (GetArenaNoVirtual() != NULL) {
-      ::google::protobuf::ListValue* temp = new ::google::protobuf::ListValue(*kind_.list_value_);
-      kind_.list_value_ = NULL;
-      return temp;
-    } else {
-      ::google::protobuf::ListValue* temp = kind_.list_value_;
-      kind_.list_value_ = NULL;
-      return temp;
-    }
-  } else {
-    return NULL;
-  }
-}
-void Value::set_allocated_list_value(::google::protobuf::ListValue* list_value) {
-  clear_kind();
-  if (list_value) {
-    if (GetArenaNoVirtual() != NULL &&
-        ::google::protobuf::Arena::GetArena(list_value) == NULL) {
-      GetArenaNoVirtual()->Own(list_value);
-    } else if (GetArenaNoVirtual() !=
-               ::google::protobuf::Arena::GetArena(list_value)) {
-      ::google::protobuf::ListValue* new_list_value = 
-          ::google::protobuf::Arena::CreateMessage< ::google::protobuf::ListValue >(
-          GetArenaNoVirtual());
-      new_list_value->CopyFrom(*list_value);
-      list_value = new_list_value;
-    }
-    set_has_list_value();
-    kind_.list_value_ = list_value;
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.list_value)
-}
- ::google::protobuf::ListValue* Value::unsafe_arena_release_list_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.list_value)
-  if (has_list_value()) {
-    clear_has_kind();
-    ::google::protobuf::ListValue* temp = kind_.list_value_;
-    kind_.list_value_ = NULL;
-    return temp;
-  } else {
-    return NULL;
-  }
-}
- void Value::unsafe_arena_set_allocated_list_value(::google::protobuf::ListValue* list_value) {
-  clear_kind();
-  if (list_value) {
-    set_has_list_value();
-    kind_.list_value_ = list_value;
-  }
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Value.list_value)
-}
-
-bool Value::has_kind() const {
-  return kind_case() != KIND_NOT_SET;
-}
-void Value::clear_has_kind() {
-  _oneof_case_[0] = KIND_NOT_SET;
-}
-Value::KindCase Value::kind_case() const {
-  return Value::KindCase(_oneof_case_[0]);
-}
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void ListValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int ListValue::kValuesFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 ListValue::ListValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.ListValue)
 }
@@ -1522,9 +1196,7 @@ ListValue::ListValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena),
   values_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.ListValue)
@@ -1532,14 +1204,12 @@ ListValue::ListValue(::google::protobuf::Arena* arena)
 ListValue::ListValue(const ListValue& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      values_(from.values_),
-      _cached_size_(0) {
+      values_(from.values_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   // @@protoc_insertion_point(copy_constructor:google.protobuf.ListValue)
 }
 
 void ListValue::SharedCtor() {
-  _cached_size_ = 0;
 }
 
 ListValue::~ListValue() {
@@ -1548,11 +1218,7 @@ ListValue::~ListValue() {
 }
 
 void ListValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void ListValue::ArenaDtor(void* object) {
@@ -1562,27 +1228,27 @@ void ListValue::ArenaDtor(void* object) {
 void ListValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void ListValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* ListValue::descriptor() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[3].descriptor;
+  ::protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const ListValue& ListValue::default_instance() {
-  protobuf_google_2fprotobuf_2fstruct_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fstruct_2eproto::scc_info_ListValue.base);
   return *internal_default_instance();
 }
 
-ListValue* ListValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<ListValue>(arena);
-}
 
 void ListValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.ListValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   values_.Clear();
+  _internal_metadata_.Clear();
 }
 
 bool ListValue::MergePartialFromCodedStream(
@@ -1591,32 +1257,29 @@ bool ListValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.ListValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // repeated .google.protobuf.Value values = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_values()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1633,26 +1296,44 @@ failure:
 void ListValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.ListValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.Value values = 1;
-  for (unsigned int i = 0, n = this->values_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->values_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      1, this->values(i), output);
+      1,
+      this->values(static_cast<int>(i)),
+      output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.ListValue)
 }
 
 ::google::protobuf::uint8* ListValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.ListValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // repeated .google.protobuf.Value values = 1;
-  for (unsigned int i = 0, n = this->values_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->values_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        1, this->values(i), false, target);
+      InternalWriteMessageToArray(
+        1, this->values(static_cast<int>(i)), deterministic, target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.ListValue)
   return target;
 }
@@ -1661,21 +1342,24 @@ size_t ListValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.ListValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Value values = 1;
   {
-    unsigned int count = this->values_size();
+    unsigned int count = static_cast<unsigned int>(this->values_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->values(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->values(static_cast<int>(i)));
     }
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1698,6 +1382,9 @@ void ListValue::MergeFrom(const ListValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.ListValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   values_.MergeFrom(from.values_);
 }
 
@@ -1739,52 +1426,34 @@ void ListValue::UnsafeArenaSwap(ListValue* other) {
   InternalSwap(other);
 }
 void ListValue::InternalSwap(ListValue* other) {
-  values_.UnsafeArenaSwap(&other->values_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&values_)->InternalSwap(CastToBase(&other->values_));
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata ListValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fstruct_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[3];
+  return ::protobuf_google_2fprotobuf_2fstruct_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// ListValue
 
-// repeated .google.protobuf.Value values = 1;
-int ListValue::values_size() const {
-  return values_.size();
-}
-void ListValue::clear_values() {
-  values_.Clear();
-}
-const ::google::protobuf::Value& ListValue::values(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ListValue.values)
-  return values_.Get(index);
-}
-::google::protobuf::Value* ListValue::mutable_values(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.ListValue.values)
-  return values_.Mutable(index);
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Struct_FieldsEntry_DoNotUse* Arena::CreateMaybeMessage< ::google::protobuf::Struct_FieldsEntry_DoNotUse >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Struct_FieldsEntry_DoNotUse >(arena);
 }
-::google::protobuf::Value* ListValue::add_values() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ListValue.values)
-  return values_.Add();
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Struct* Arena::CreateMaybeMessage< ::google::protobuf::Struct >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Struct >(arena);
 }
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >*
-ListValue::mutable_values() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.ListValue.values)
-  return &values_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Value* Arena::CreateMaybeMessage< ::google::protobuf::Value >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Value >(arena);
 }
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >&
-ListValue::values() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.ListValue.values)
-  return values_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::ListValue* Arena::CreateMaybeMessage< ::google::protobuf::ListValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::ListValue >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/struct.pb.h b/src/google/protobuf/struct.pb.h
index 043f0c32..75665ff2 100644
--- a/src/google/protobuf/struct.pb.h
+++ b/src/google/protobuf/struct.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/struct.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fstruct_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fstruct_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fstruct_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fstruct_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,16 +22,33 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
-#include <google/protobuf/map.h>
+#include <google/protobuf/map.h>  // IWYU pragma: export
+#include <google/protobuf/map_entry.h>
 #include <google/protobuf/map_field_inl.h>
 #include <google/protobuf/generated_enum_reflection.h>
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fstruct_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fstruct_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[4];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fstruct_2eproto
 namespace google {
 namespace protobuf {
 class ListValue;
@@ -40,25 +57,24 @@ LIBPROTOBUF_EXPORT extern ListValueDefaultTypeInternal _ListValue_default_instan
 class Struct;
 class StructDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern StructDefaultTypeInternal _Struct_default_instance_;
+class Struct_FieldsEntry_DoNotUse;
+class Struct_FieldsEntry_DoNotUseDefaultTypeInternal;
+LIBPROTOBUF_EXPORT extern Struct_FieldsEntry_DoNotUseDefaultTypeInternal _Struct_FieldsEntry_DoNotUse_default_instance_;
 class Value;
 class ValueDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern ValueDefaultTypeInternal _Value_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fstruct_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fstruct_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::ListValue* Arena::CreateMaybeMessage<::google::protobuf::ListValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Struct* Arena::CreateMaybeMessage<::google::protobuf::Struct>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Struct_FieldsEntry_DoNotUse* Arena::CreateMaybeMessage<::google::protobuf::Struct_FieldsEntry_DoNotUse>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Value* Arena::CreateMaybeMessage<::google::protobuf::Value>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 enum NullValue {
   NULL_VALUE = 0,
@@ -82,6 +98,24 @@ inline bool NullValue_Parse(
 }
 // ===================================================================
 
+class Struct_FieldsEntry_DoNotUse : public ::google::protobuf::internal::MapEntry<Struct_FieldsEntry_DoNotUse, 
+    ::std::string, ::google::protobuf::Value,
+    ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
+    ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
+    0 > {
+public:
+  typedef ::google::protobuf::internal::MapEntry<Struct_FieldsEntry_DoNotUse, 
+    ::std::string, ::google::protobuf::Value,
+    ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
+    ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
+    0 > SuperType;
+  Struct_FieldsEntry_DoNotUse();
+  Struct_FieldsEntry_DoNotUse(::google::protobuf::Arena* arena);
+  void MergeFrom(const Struct_FieldsEntry_DoNotUse& other);
+  static const Struct_FieldsEntry_DoNotUse* internal_default_instance() { return reinterpret_cast<const Struct_FieldsEntry_DoNotUse*>(&_Struct_FieldsEntry_DoNotUse_default_instance_); }
+  void MergeFrom(const ::google::protobuf::Message& other) final;
+  ::google::protobuf::Metadata GetMetadata() const;
+};
 
 // -------------------------------------------------------------------
 
@@ -96,53 +130,73 @@ class LIBPROTOBUF_EXPORT Struct : public ::google::protobuf::Message /* @@protoc
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Struct(Struct&& from) noexcept
+    : Struct() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Struct& operator=(Struct&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Struct& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Struct* internal_default_instance() {
     return reinterpret_cast<const Struct*>(
                &_Struct_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
   void UnsafeArenaSwap(Struct* other);
   void Swap(Struct* other);
+  friend void swap(Struct& a, Struct& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Struct* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Struct* New() const final {
+    return CreateMaybeMessage<Struct>(NULL);
+  }
 
-  Struct* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Struct* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Struct>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Struct& from);
   void MergeFrom(const Struct& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Struct* other);
   protected:
   explicit Struct(::google::protobuf::Arena* arena);
@@ -158,7 +212,7 @@ class LIBPROTOBUF_EXPORT Struct : public ::google::protobuf::Message /* @@protoc
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -178,22 +232,17 @@ class LIBPROTOBUF_EXPORT Struct : public ::google::protobuf::Message /* @@protoc
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
-  typedef ::google::protobuf::internal::MapEntryLite<
-      ::std::string, ::google::protobuf::Value,
-      ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
-      ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
-      0 >
-      Struct_FieldsEntry;
   ::google::protobuf::internal::MapField<
+      Struct_FieldsEntry_DoNotUse,
       ::std::string, ::google::protobuf::Value,
       ::google::protobuf::internal::WireFormatLite::TYPE_STRING,
       ::google::protobuf::internal::WireFormatLite::TYPE_MESSAGE,
       0 > fields_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -208,11 +257,25 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Value(Value&& from) noexcept
+    : Value() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Value& operator=(Value&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
@@ -228,43 +291,49 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
     KIND_NOT_SET = 0,
   };
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Value* internal_default_instance() {
     return reinterpret_cast<const Value*>(
                &_Value_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
   void UnsafeArenaSwap(Value* other);
   void Swap(Value* other);
+  friend void swap(Value& a, Value& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Value* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Value* New() const final {
+    return CreateMaybeMessage<Value>(NULL);
+  }
 
-  Value* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Value* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Value>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Value& from);
   void MergeFrom(const Value& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Value* other);
   protected:
   explicit Value(::google::protobuf::Arena* arena);
@@ -280,7 +349,7 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -312,12 +381,21 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
   static const int kStringValueFieldNumber = 3;
   const ::std::string& string_value() const;
   void set_string_value(const ::std::string& value);
+  #if LANG_CXX11
+  void set_string_value(::std::string&& value);
+  #endif
   void set_string_value(const char* value);
   void set_string_value(const char* value, size_t size);
   ::std::string* mutable_string_value();
   ::std::string* release_string_value();
   void set_allocated_string_value(::std::string* string_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_string_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_string_value(
       ::std::string* string_value);
 
@@ -335,37 +413,32 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
   void clear_struct_value();
   static const int kStructValueFieldNumber = 5;
   private:
-  void _slow_mutable_struct_value();
-  void _slow_set_allocated_struct_value(
-      ::google::protobuf::Arena* message_arena, ::google::protobuf::Struct** struct_value);
-  ::google::protobuf::Struct* _slow_release_struct_value();
+  const ::google::protobuf::Struct& _internal_struct_value() const;
   public:
   const ::google::protobuf::Struct& struct_value() const;
-  ::google::protobuf::Struct* mutable_struct_value();
   ::google::protobuf::Struct* release_struct_value();
+  ::google::protobuf::Struct* mutable_struct_value();
   void set_allocated_struct_value(::google::protobuf::Struct* struct_value);
-  ::google::protobuf::Struct* unsafe_arena_release_struct_value();
   void unsafe_arena_set_allocated_struct_value(
       ::google::protobuf::Struct* struct_value);
+  ::google::protobuf::Struct* unsafe_arena_release_struct_value();
 
   // .google.protobuf.ListValue list_value = 6;
   bool has_list_value() const;
   void clear_list_value();
   static const int kListValueFieldNumber = 6;
   private:
-  void _slow_mutable_list_value();
-  void _slow_set_allocated_list_value(
-      ::google::protobuf::Arena* message_arena, ::google::protobuf::ListValue** list_value);
-  ::google::protobuf::ListValue* _slow_release_list_value();
+  const ::google::protobuf::ListValue& _internal_list_value() const;
   public:
   const ::google::protobuf::ListValue& list_value() const;
-  ::google::protobuf::ListValue* mutable_list_value();
   ::google::protobuf::ListValue* release_list_value();
+  ::google::protobuf::ListValue* mutable_list_value();
   void set_allocated_list_value(::google::protobuf::ListValue* list_value);
-  ::google::protobuf::ListValue* unsafe_arena_release_list_value();
   void unsafe_arena_set_allocated_list_value(
       ::google::protobuf::ListValue* list_value);
+  ::google::protobuf::ListValue* unsafe_arena_release_list_value();
 
+  void clear_kind();
   KindCase kind_case() const;
   // @@protoc_insertion_point(class_scope:google.protobuf.Value)
  private:
@@ -377,11 +450,10 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
   void set_has_list_value();
 
   inline bool has_kind() const;
-  void clear_kind();
   inline void clear_has_kind();
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   union KindUnion {
@@ -393,10 +465,10 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
     ::google::protobuf::Struct* struct_value_;
     ::google::protobuf::ListValue* list_value_;
   } kind_;
-  mutable int _cached_size_;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
   ::google::protobuf::uint32 _oneof_case_[1];
 
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
+  friend struct ::protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -411,53 +483,73 @@ class LIBPROTOBUF_EXPORT ListValue : public ::google::protobuf::Message /* @@pro
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  ListValue(ListValue&& from) noexcept
+    : ListValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline ListValue& operator=(ListValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const ListValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const ListValue* internal_default_instance() {
     return reinterpret_cast<const ListValue*>(
                &_ListValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    3;
 
   void UnsafeArenaSwap(ListValue* other);
   void Swap(ListValue* other);
+  friend void swap(ListValue& a, ListValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline ListValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline ListValue* New() const final {
+    return CreateMaybeMessage<ListValue>(NULL);
+  }
 
-  ListValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  ListValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<ListValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const ListValue& from);
   void MergeFrom(const ListValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(ListValue* other);
   protected:
   explicit ListValue(::google::protobuf::Arena* arena);
@@ -473,7 +565,7 @@ class LIBPROTOBUF_EXPORT ListValue : public ::google::protobuf::Message /* @@pro
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -483,11 +575,11 @@ class LIBPROTOBUF_EXPORT ListValue : public ::google::protobuf::Message /* @@pro
   int values_size() const;
   void clear_values();
   static const int kValuesFieldNumber = 1;
-  const ::google::protobuf::Value& values(int index) const;
   ::google::protobuf::Value* mutable_values(int index);
-  ::google::protobuf::Value* add_values();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >*
       mutable_values();
+  const ::google::protobuf::Value& values(int index) const;
+  ::google::protobuf::Value* add_values();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >&
       values() const;
 
@@ -495,19 +587,22 @@ class LIBPROTOBUF_EXPORT ListValue : public ::google::protobuf::Message /* @@pro
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value > values_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fstruct_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // Struct
@@ -623,7 +718,21 @@ inline void Value::set_string_value(const ::std::string& value) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Value.string_value)
 }
+#if LANG_CXX11
+inline void Value::set_string_value(::std::string&& value) {
+  // @@protoc_insertion_point(field_set:google.protobuf.Value.string_value)
+  if (!has_string_value()) {
+    clear_kind();
+    set_has_string_value();
+    kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  }
+  kind_.string_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Value.string_value)
+}
+#endif
 inline void Value::set_string_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   if (!has_string_value()) {
     clear_kind();
     set_has_string_value();
@@ -640,7 +749,8 @@ inline void Value::set_string_value(const char* value,
     set_has_string_value();
     kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   }
-  kind_.string_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
+  kind_.string_value_.Set(
+      &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
       reinterpret_cast<const char*>(value), size),
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_pointer:google.protobuf.Value.string_value)
@@ -665,17 +775,6 @@ inline ::std::string* Value::release_string_value() {
     return NULL;
   }
 }
-inline ::std::string* Value::unsafe_arena_release_string_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.string_value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (has_string_value()) {
-    clear_has_kind();
-    return kind_.string_value_.UnsafeArenaRelease(
-        &::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-  } else {
-    return NULL;
-  }
-}
 inline void Value::set_allocated_string_value(::std::string* string_value) {
   if (!has_string_value()) {
     kind_.string_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
@@ -688,6 +787,17 @@ inline void Value::set_allocated_string_value(::std::string* string_value) {
   }
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.string_value)
 }
+inline ::std::string* Value::unsafe_arena_release_string_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.string_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  if (has_string_value()) {
+    clear_has_kind();
+    return kind_.string_value_.UnsafeArenaRelease(
+        &::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  } else {
+    return NULL;
+  }
+}
 inline void Value::unsafe_arena_set_allocated_string_value(::std::string* string_value) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
   if (!has_string_value()) {
@@ -745,60 +855,30 @@ inline void Value::clear_struct_value() {
     clear_has_kind();
   }
 }
-inline  const ::google::protobuf::Struct& Value::struct_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.struct_value)
-  return has_struct_value()
-      ? *kind_.struct_value_
-      : ::google::protobuf::Struct::default_instance();
-}
-inline ::google::protobuf::Struct* Value::mutable_struct_value() {
-  if (!has_struct_value()) {
-    clear_kind();
-    set_has_struct_value();
-    kind_.struct_value_ = 
-      ::google::protobuf::Arena::CreateMessage< ::google::protobuf::Struct >(
-      GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.struct_value)
-  return kind_.struct_value_;
+inline const ::google::protobuf::Struct& Value::_internal_struct_value() const {
+  return *kind_.struct_value_;
 }
 inline ::google::protobuf::Struct* Value::release_struct_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.Value.struct_value)
   if (has_struct_value()) {
     clear_has_kind();
-    if (GetArenaNoVirtual() != NULL) {
-      ::google::protobuf::Struct* temp = new ::google::protobuf::Struct(*kind_.struct_value_);
-      kind_.struct_value_ = NULL;
-      return temp;
-    } else {
       ::google::protobuf::Struct* temp = kind_.struct_value_;
-      kind_.struct_value_ = NULL;
-      return temp;
+    if (GetArenaNoVirtual() != NULL) {
+      temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
     }
+    kind_.struct_value_ = NULL;
+    return temp;
   } else {
     return NULL;
   }
 }
-inline void Value::set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
-  clear_kind();
-  if (struct_value) {
-    if (GetArenaNoVirtual() != NULL &&
-        ::google::protobuf::Arena::GetArena(struct_value) == NULL) {
-      GetArenaNoVirtual()->Own(struct_value);
-    } else if (GetArenaNoVirtual() !=
-               ::google::protobuf::Arena::GetArena(struct_value)) {
-      ::google::protobuf::Struct* new_struct_value = 
-          ::google::protobuf::Arena::CreateMessage< ::google::protobuf::Struct >(
-          GetArenaNoVirtual());
-      new_struct_value->CopyFrom(*struct_value);
-      struct_value = new_struct_value;
-    }
-    set_has_struct_value();
-    kind_.struct_value_ = struct_value;
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.struct_value)
+inline const ::google::protobuf::Struct& Value::struct_value() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Value.struct_value)
+  return has_struct_value()
+      ? *kind_.struct_value_
+      : *reinterpret_cast< ::google::protobuf::Struct*>(&::google::protobuf::_Struct_default_instance_);
 }
-inline  ::google::protobuf::Struct* Value::unsafe_arena_release_struct_value() {
+inline ::google::protobuf::Struct* Value::unsafe_arena_release_struct_value() {
   // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.struct_value)
   if (has_struct_value()) {
     clear_has_kind();
@@ -809,7 +889,7 @@ inline  ::google::protobuf::Struct* Value::unsafe_arena_release_struct_value() {
     return NULL;
   }
 }
-inline  void Value::unsafe_arena_set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
+inline void Value::unsafe_arena_set_allocated_struct_value(::google::protobuf::Struct* struct_value) {
   clear_kind();
   if (struct_value) {
     set_has_struct_value();
@@ -817,6 +897,16 @@ inline  void Value::unsafe_arena_set_allocated_struct_value(::google::protobuf::
   }
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Value.struct_value)
 }
+inline ::google::protobuf::Struct* Value::mutable_struct_value() {
+  if (!has_struct_value()) {
+    clear_kind();
+    set_has_struct_value();
+    kind_.struct_value_ = CreateMaybeMessage< ::google::protobuf::Struct >(
+        GetArenaNoVirtual());
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.struct_value)
+  return kind_.struct_value_;
+}
 
 // .google.protobuf.ListValue list_value = 6;
 inline bool Value::has_list_value() const {
@@ -833,60 +923,30 @@ inline void Value::clear_list_value() {
     clear_has_kind();
   }
 }
-inline  const ::google::protobuf::ListValue& Value::list_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Value.list_value)
-  return has_list_value()
-      ? *kind_.list_value_
-      : ::google::protobuf::ListValue::default_instance();
-}
-inline ::google::protobuf::ListValue* Value::mutable_list_value() {
-  if (!has_list_value()) {
-    clear_kind();
-    set_has_list_value();
-    kind_.list_value_ = 
-      ::google::protobuf::Arena::CreateMessage< ::google::protobuf::ListValue >(
-      GetArenaNoVirtual());
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.list_value)
-  return kind_.list_value_;
+inline const ::google::protobuf::ListValue& Value::_internal_list_value() const {
+  return *kind_.list_value_;
 }
 inline ::google::protobuf::ListValue* Value::release_list_value() {
   // @@protoc_insertion_point(field_release:google.protobuf.Value.list_value)
   if (has_list_value()) {
     clear_has_kind();
-    if (GetArenaNoVirtual() != NULL) {
-      ::google::protobuf::ListValue* temp = new ::google::protobuf::ListValue(*kind_.list_value_);
-      kind_.list_value_ = NULL;
-      return temp;
-    } else {
       ::google::protobuf::ListValue* temp = kind_.list_value_;
-      kind_.list_value_ = NULL;
-      return temp;
+    if (GetArenaNoVirtual() != NULL) {
+      temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
     }
+    kind_.list_value_ = NULL;
+    return temp;
   } else {
     return NULL;
   }
 }
-inline void Value::set_allocated_list_value(::google::protobuf::ListValue* list_value) {
-  clear_kind();
-  if (list_value) {
-    if (GetArenaNoVirtual() != NULL &&
-        ::google::protobuf::Arena::GetArena(list_value) == NULL) {
-      GetArenaNoVirtual()->Own(list_value);
-    } else if (GetArenaNoVirtual() !=
-               ::google::protobuf::Arena::GetArena(list_value)) {
-      ::google::protobuf::ListValue* new_list_value = 
-          ::google::protobuf::Arena::CreateMessage< ::google::protobuf::ListValue >(
-          GetArenaNoVirtual());
-      new_list_value->CopyFrom(*list_value);
-      list_value = new_list_value;
-    }
-    set_has_list_value();
-    kind_.list_value_ = list_value;
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Value.list_value)
+inline const ::google::protobuf::ListValue& Value::list_value() const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Value.list_value)
+  return has_list_value()
+      ? *kind_.list_value_
+      : *reinterpret_cast< ::google::protobuf::ListValue*>(&::google::protobuf::_ListValue_default_instance_);
 }
-inline  ::google::protobuf::ListValue* Value::unsafe_arena_release_list_value() {
+inline ::google::protobuf::ListValue* Value::unsafe_arena_release_list_value() {
   // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Value.list_value)
   if (has_list_value()) {
     clear_has_kind();
@@ -897,7 +957,7 @@ inline  ::google::protobuf::ListValue* Value::unsafe_arena_release_list_value()
     return NULL;
   }
 }
-inline  void Value::unsafe_arena_set_allocated_list_value(::google::protobuf::ListValue* list_value) {
+inline void Value::unsafe_arena_set_allocated_list_value(::google::protobuf::ListValue* list_value) {
   clear_kind();
   if (list_value) {
     set_has_list_value();
@@ -905,6 +965,16 @@ inline  void Value::unsafe_arena_set_allocated_list_value(::google::protobuf::Li
   }
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Value.list_value)
 }
+inline ::google::protobuf::ListValue* Value::mutable_list_value() {
+  if (!has_list_value()) {
+    clear_kind();
+    set_has_list_value();
+    kind_.list_value_ = CreateMaybeMessage< ::google::protobuf::ListValue >(
+        GetArenaNoVirtual());
+  }
+  // @@protoc_insertion_point(field_mutable:google.protobuf.Value.list_value)
+  return kind_.list_value_;
+}
 
 inline bool Value::has_kind() const {
   return kind_case() != KIND_NOT_SET;
@@ -926,30 +996,32 @@ inline int ListValue::values_size() const {
 inline void ListValue::clear_values() {
   values_.Clear();
 }
-inline const ::google::protobuf::Value& ListValue::values(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.ListValue.values)
-  return values_.Get(index);
-}
 inline ::google::protobuf::Value* ListValue::mutable_values(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.ListValue.values)
   return values_.Mutable(index);
 }
-inline ::google::protobuf::Value* ListValue::add_values() {
-  // @@protoc_insertion_point(field_add:google.protobuf.ListValue.values)
-  return values_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >*
 ListValue::mutable_values() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.ListValue.values)
   return &values_;
 }
+inline const ::google::protobuf::Value& ListValue::values(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.ListValue.values)
+  return values_.Get(index);
+}
+inline ::google::protobuf::Value* ListValue::add_values() {
+  // @@protoc_insertion_point(field_add:google.protobuf.ListValue.values)
+  return values_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Value >&
 ListValue::values() const {
   // @@protoc_insertion_point(field_list:google.protobuf.ListValue.values)
   return values_;
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -959,15 +1031,13 @@ ListValue::values() const {
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
-#ifndef SWIG
 namespace google {
 namespace protobuf {
 
-template <> struct is_proto_enum< ::google::protobuf::NullValue> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::NullValue> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::NullValue>() {
   return ::google::protobuf::NullValue_descriptor();
@@ -975,8 +1045,7 @@ inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::NullValue>()
 
 }  // namespace protobuf
 }  // namespace google
-#endif  // SWIG
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fstruct_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fstruct_2eproto
diff --git a/src/google/protobuf/stubs/atomicops.h b/src/google/protobuf/stubs/atomicops.h
deleted file mode 100644
index 75aee306..00000000
--- a/src/google/protobuf/stubs/atomicops.h
+++ /dev/null
@@ -1,249 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// The routines exported by this module are subtle.  If you use them, even if
-// you get the code right, it will depend on careful reasoning about atomicity
-// and memory ordering; it will be less readable, and harder to maintain.  If
-// you plan to use these routines, you should have a good reason, such as solid
-// evidence that performance would otherwise suffer, or there being no
-// alternative.  You should assume only properties explicitly guaranteed by the
-// specifications in this file.  You are almost certainly _not_ writing code
-// just for the x86; if you assume x86 semantics, x86 hardware bugs and
-// implementations on other archtectures will cause your code to break.  If you
-// do not know what you are doing, avoid these routines, and use a Mutex.
-//
-// It is incorrect to make direct assignments to/from an atomic variable.
-// You should use one of the Load or Store routines.  The NoBarrier
-// versions are provided when no barriers are needed:
-//   NoBarrier_Store()
-//   NoBarrier_Load()
-// Although there are currently no compiler enforcement, you are encouraged
-// to use these.
-
-// This header and the implementations for each platform (located in
-// atomicops_internals_*) must be kept in sync with the upstream code (V8).
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_H_
-
-// Don't include this file for people not concerned about thread safety.
-#ifndef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/platform_macros.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-#if defined(GOOGLE_PROTOBUF_ARCH_POWER)
-#if defined(_LP64) || defined(__LP64__)
-typedef int32 Atomic32;
-typedef intptr_t Atomic64;
-#else
-typedef intptr_t Atomic32;
-typedef int64 Atomic64;
-#endif
-#else
-typedef int32 Atomic32;
-#ifdef GOOGLE_PROTOBUF_ARCH_64_BIT
-// We need to be able to go between Atomic64 and AtomicWord implicitly.  This
-// means Atomic64 and AtomicWord should be the same type on 64-bit.
-#if defined(__ILP32__) || defined(GOOGLE_PROTOBUF_OS_NACL)
-// NaCl's intptr_t is not actually 64-bits on 64-bit!
-// http://code.google.com/p/nativeclient/issues/detail?id=1162
-// sparcv9's pointer type is 32bits
-typedef int64 Atomic64;
-#else
-typedef intptr_t Atomic64;
-#endif
-#endif
-#endif
-
-// Use AtomicWord for a machine-sized pointer.  It will use the Atomic32 or
-// Atomic64 routines below, depending on your architecture.
-typedef intptr_t AtomicWord;
-
-// Atomically execute:
-//      result = *ptr;
-//      if (*ptr == old_value)
-//        *ptr = new_value;
-//      return result;
-//
-// I.e., replace "*ptr" with "new_value" if "*ptr" used to be "old_value".
-// Always return the old value of "*ptr"
-//
-// This routine implies no memory barriers.
-Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                  Atomic32 old_value,
-                                  Atomic32 new_value);
-
-// Atomically store new_value into *ptr, returning the previous value held in
-// *ptr.  This routine implies no memory barriers.
-Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, Atomic32 new_value);
-
-// Atomically increment *ptr by "increment".  Returns the new value of
-// *ptr with the increment applied.  This routine implies no memory barriers.
-Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, Atomic32 increment);
-
-Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                 Atomic32 increment);
-
-// These following lower-level operations are typically useful only to people
-// implementing higher-level synchronization operations like spinlocks,
-// mutexes, and condition-variables.  They combine CompareAndSwap(), a load, or
-// a store with appropriate memory-ordering instructions.  "Acquire" operations
-// ensure that no later memory access can be reordered ahead of the operation.
-// "Release" operations ensure that no previous memory access can be reordered
-// after the operation.  "Barrier" operations have both "Acquire" and "Release"
-// semantics.   A MemoryBarrierInternal() has "Barrier" semantics, but does no
-// memory access.
-Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                Atomic32 old_value,
-                                Atomic32 new_value);
-Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                Atomic32 old_value,
-                                Atomic32 new_value);
-
-// This function was renamed from MemoryBarrier to MemoryBarrierInternal
-// because MemoryBarrier is a define in Windows ARM builds and we do not
-// undefine it because we call it from this function.
-void MemoryBarrierInternal();
-void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value);
-void Acquire_Store(volatile Atomic32* ptr, Atomic32 value);
-void Release_Store(volatile Atomic32* ptr, Atomic32 value);
-
-Atomic32 NoBarrier_Load(volatile const Atomic32* ptr);
-Atomic32 Acquire_Load(volatile const Atomic32* ptr);
-Atomic32 Release_Load(volatile const Atomic32* ptr);
-
-// 64-bit atomic operations (only available on 64-bit processors).
-#ifdef GOOGLE_PROTOBUF_ARCH_64_BIT
-Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                  Atomic64 old_value,
-                                  Atomic64 new_value);
-Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, Atomic64 new_value);
-Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment);
-Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment);
-
-Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                Atomic64 old_value,
-                                Atomic64 new_value);
-Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                Atomic64 old_value,
-                                Atomic64 new_value);
-void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value);
-void Acquire_Store(volatile Atomic64* ptr, Atomic64 value);
-void Release_Store(volatile Atomic64* ptr, Atomic64 value);
-Atomic64 NoBarrier_Load(volatile const Atomic64* ptr);
-Atomic64 Acquire_Load(volatile const Atomic64* ptr);
-Atomic64 Release_Load(volatile const Atomic64* ptr);
-#endif  // GOOGLE_PROTOBUF_ARCH_64_BIT
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-// Include our platform specific implementation.
-#define GOOGLE_PROTOBUF_ATOMICOPS_ERROR \
-"Atomic operations are not supported on your platform"
-
-// ThreadSanitizer, http://clang.llvm.org/docs/ThreadSanitizer.html.
-#if defined(THREAD_SANITIZER)
-#include <google/protobuf/stubs/atomicops_internals_tsan.h>
-// MSVC.
-#elif defined(_MSC_VER)
-#if defined(GOOGLE_PROTOBUF_ARCH_IA32) || defined(GOOGLE_PROTOBUF_ARCH_X64) || defined(GOOGLE_PROTOBUF_ARCH_ARM)
-#include <google/protobuf/stubs/atomicops_internals_x86_msvc.h>
-#else
-#error GOOGLE_PROTOBUF_ATOMICOPS_ERROR
-#endif
-
-// Solaris
-#elif defined(GOOGLE_PROTOBUF_OS_SOLARIS)
-#include <google/protobuf/stubs/atomicops_internals_solaris.h>
-
-// AIX
-#elif defined(GOOGLE_PROTOBUF_OS_AIX)
-#include <google/protobuf/stubs/atomicops_internals_power.h>
-
-// GCC.
-#elif defined(__GNUC__)
-#if defined(GOOGLE_PROTOBUF_ARCH_IA32) || defined(GOOGLE_PROTOBUF_ARCH_X64)
-#include <google/protobuf/stubs/atomicops_internals_x86_gcc.h>
-#elif defined(GOOGLE_PROTOBUF_ARCH_ARM) && defined(__linux__)
-#if (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4))
-#include <google/protobuf/stubs/atomicops_internals_generic_gcc.h>
-#else
-#include <google/protobuf/stubs/atomicops_internals_arm_gcc.h>
-#endif
-#elif defined(GOOGLE_PROTOBUF_ARCH_AARCH64)
-#include <google/protobuf/stubs/atomicops_internals_arm64_gcc.h>
-#elif defined(GOOGLE_PROTOBUF_ARCH_ARM_QNX)
-#include <google/protobuf/stubs/atomicops_internals_arm_qnx.h>
-#elif defined(GOOGLE_PROTOBUF_ARCH_MIPS) || defined(GOOGLE_PROTOBUF_ARCH_MIPS64)
-#include <google/protobuf/stubs/atomicops_internals_mips_gcc.h>
-#elif defined(GOOGLE_PROTOBUF_ARCH_POWER)
-#include <google/protobuf/stubs/atomicops_internals_power.h>
-#elif defined(__native_client__)
-// The static_asserts in the C++11 atomics implementation cause it to fail
-// with certain compilers, e.g. nvcc on macOS. Don't use elsewhere unless
-// the TODO in that file is addressed.
-#include <google/protobuf/stubs/atomicops_internals_generic_c11_atomic.h>
-#elif defined(GOOGLE_PROTOBUF_ARCH_PPC)
-#include <google/protobuf/stubs/atomicops_internals_ppc_gcc.h>
-#elif (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4))
-#include <google/protobuf/stubs/atomicops_internals_generic_gcc.h>
-#elif defined(__clang__)
-#if __has_extension(c_atomic)
-#include <google/protobuf/stubs/atomicops_internals_generic_gcc.h>
-#else
-#error GOOGLE_PROTOBUF_ATOMICOPS_ERROR
-#endif
-#else
-#error GOOGLE_PROTOBUF_ATOMICOPS_ERROR
-#endif
-
-// Unknown.
-#else
-#error GOOGLE_PROTOBUF_ATOMICOPS_ERROR
-#endif
-
-// On some platforms we need additional declarations to make AtomicWord
-// compatible with our other Atomic* types.
-#if defined(GOOGLE_PROTOBUF_OS_APPLE)
-#include <google/protobuf/stubs/atomicops_internals_atomicword_compat.h>
-#endif
-
-#undef GOOGLE_PROTOBUF_ATOMICOPS_ERROR
-
-#endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h b/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h
deleted file mode 100644
index 9a69d21a..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h
+++ /dev/null
@@ -1,325 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline void MemoryBarrierInternal() {
-  __asm__ __volatile__ ("dmb ish" ::: "memory");  // NOLINT
-}
-
-// NoBarrier versions of the operation include "memory" in the clobber list.
-// This is not required for direct usage of the NoBarrier versions of the
-// operations. However this is required for correctness when they are used as
-// part of the Acquire or Release versions, to ensure that nothing from outside
-// the call is reordered between the operation and the memory barrier. This does
-// not change the code generated, so has no or minimal impact on the
-// NoBarrier operations.
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                    \n\t"
-    "ldxr %w[prev], %[ptr]                 \n\t"  // Load the previous value.
-    "cmp %w[prev], %w[old_value]           \n\t"
-    "bne 1f                                \n\t"
-    "stxr %w[temp], %w[new_value], %[ptr]  \n\t"  // Try to store the new value.
-    "cbnz %w[temp], 0b                     \n\t"  // Retry if it did not work.
-    "1:                                    \n\t"
-    : [prev]"=&r" (prev),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [old_value]"IJr" (old_value),
-      [new_value]"r" (new_value)
-    : "cc", "memory"
-  );  // NOLINT
-
-  return prev;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  Atomic32 result;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                    \n\t"
-    "ldxr %w[result], %[ptr]               \n\t"  // Load the previous value.
-    "stxr %w[temp], %w[new_value], %[ptr]  \n\t"  // Try to store the new value.
-    "cbnz %w[temp], 0b                     \n\t"  // Retry if it did not work.
-    : [result]"=&r" (result),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [new_value]"r" (new_value)
-    : "memory"
-  );  // NOLINT
-
-  return result;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  Atomic32 result;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                       \n\t"
-    "ldxr %w[result], %[ptr]                  \n\t"  // Load the previous value.
-    "add %w[result], %w[result], %w[increment]\n\t"
-    "stxr %w[temp], %w[result], %[ptr]        \n\t"  // Try to store the result.
-    "cbnz %w[temp], 0b                        \n\t"  // Retry on failure.
-    : [result]"=&r" (result),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [increment]"IJr" (increment)
-    : "memory"
-  );  // NOLINT
-
-  return result;
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  MemoryBarrierInternal();
-  Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment);
-  MemoryBarrierInternal();
-
-  return result;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-
-  return prev;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  MemoryBarrierInternal();
-  Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-
-  return prev;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  __asm__ __volatile__ (  // NOLINT
-    "stlr %w[value], %[ptr]  \n\t"
-    : [ptr]"=Q" (*ptr)
-    : [value]"r" (value)
-    : "memory"
-  );  // NOLINT
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value;
-
-  __asm__ __volatile__ (  // NOLINT
-    "ldar %w[value], %[ptr]  \n\t"
-    : [value]"=r" (value)
-    : [ptr]"Q" (*ptr)
-    : "memory"
-  );  // NOLINT
-
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-// 64-bit versions of the operations.
-// See the 32-bit versions for comments.
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 prev;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                    \n\t"
-    "ldxr %[prev], %[ptr]                  \n\t"
-    "cmp %[prev], %[old_value]             \n\t"
-    "bne 1f                                \n\t"
-    "stxr %w[temp], %[new_value], %[ptr]   \n\t"
-    "cbnz %w[temp], 0b                     \n\t"
-    "1:                                    \n\t"
-    : [prev]"=&r" (prev),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [old_value]"IJr" (old_value),
-      [new_value]"r" (new_value)
-    : "cc", "memory"
-  );  // NOLINT
-
-  return prev;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  Atomic64 result;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                    \n\t"
-    "ldxr %[result], %[ptr]                \n\t"
-    "stxr %w[temp], %[new_value], %[ptr]   \n\t"
-    "cbnz %w[temp], 0b                     \n\t"
-    : [result]"=&r" (result),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [new_value]"r" (new_value)
-    : "memory"
-  );  // NOLINT
-
-  return result;
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  Atomic64 result;
-  int32_t temp;
-
-  __asm__ __volatile__ (  // NOLINT
-    "0:                                     \n\t"
-    "ldxr %[result], %[ptr]                 \n\t"
-    "add %[result], %[result], %[increment] \n\t"
-    "stxr %w[temp], %[result], %[ptr]       \n\t"
-    "cbnz %w[temp], 0b                      \n\t"
-    : [result]"=&r" (result),
-      [temp]"=&r" (temp),
-      [ptr]"+Q" (*ptr)
-    : [increment]"IJr" (increment)
-    : "memory"
-  );  // NOLINT
-
-  return result;
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                        Atomic64 increment) {
-  MemoryBarrierInternal();
-  Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment);
-  MemoryBarrierInternal();
-
-  return result;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-
-  return prev;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  MemoryBarrierInternal();
-  Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-
-  return prev;
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  __asm__ __volatile__ (  // NOLINT
-    "stlr %x[value], %[ptr]  \n\t"
-    : [ptr]"=Q" (*ptr)
-    : [value]"r" (value)
-    : "memory"
-  );  // NOLINT
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 value;
-
-  __asm__ __volatile__ (  // NOLINT
-    "ldar %x[value], %[ptr]  \n\t"
-    : [value]"=r" (value)
-    : [ptr]"Q" (*ptr)
-    : "memory"
-  );  // NOLINT
-
-  return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_arm_gcc.h b/src/google/protobuf/stubs/atomicops_internals_arm_gcc.h
deleted file mode 100644
index 6e2de67f..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_arm_gcc.h
+++ /dev/null
@@ -1,151 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-//
-// LinuxKernelCmpxchg and Barrier_AtomicIncrement are from Google Gears.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_GCC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// 0xffff0fc0 is the hard coded address of a function provided by
-// the kernel which implements an atomic compare-exchange. On older
-// ARM architecture revisions (pre-v6) this may be implemented using
-// a syscall. This address is stable, and in active use (hard coded)
-// by at least glibc-2.7 and the Android C library.
-typedef Atomic32 (*LinuxKernelCmpxchgFunc)(Atomic32 old_value,
-                                           Atomic32 new_value,
-                                           volatile Atomic32* ptr);
-LinuxKernelCmpxchgFunc pLinuxKernelCmpxchg __attribute__((weak)) =
-    (LinuxKernelCmpxchgFunc) 0xffff0fc0;
-
-typedef void (*LinuxKernelMemoryBarrierFunc)(void);
-LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) =
-    (LinuxKernelMemoryBarrierFunc) 0xffff0fa0;
-
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev_value = *ptr;
-  do {
-    if (!pLinuxKernelCmpxchg(old_value, new_value,
-                             const_cast<Atomic32*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  Atomic32 old_value;
-  do {
-    old_value = *ptr;
-  } while (pLinuxKernelCmpxchg(old_value, new_value,
-                               const_cast<Atomic32*>(ptr)));
-  return old_value;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return Barrier_AtomicIncrement(ptr, increment);
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  for (;;) {
-    // Atomic exchange the old value with an incremented one.
-    Atomic32 old_value = *ptr;
-    Atomic32 new_value = old_value + increment;
-    if (pLinuxKernelCmpxchg(old_value, new_value,
-                            const_cast<Atomic32*>(ptr)) == 0) {
-      // The exchange took place as expected.
-      return new_value;
-    }
-    // Otherwise, *ptr changed mid-loop and we need to retry.
-  }
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void MemoryBarrierInternal() {
-  pLinuxKernelMemoryBarrier();
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  MemoryBarrierInternal();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value = *ptr;
-  MemoryBarrierInternal();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_arm_qnx.h b/src/google/protobuf/stubs/atomicops_internals_arm_qnx.h
deleted file mode 100644
index cd97e0c9..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_arm_qnx.h
+++ /dev/null
@@ -1,146 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_QNX_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_QNX_H_
-
-// For _smp_cmpxchg()
-#include <pthread.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 QNXCmpxchg(Atomic32 old_value,
-                           Atomic32 new_value,
-                           volatile Atomic32* ptr) {
-  return static_cast<Atomic32>(
-      _smp_cmpxchg((volatile unsigned *)ptr,
-                   (unsigned)old_value,
-                   (unsigned)new_value));
-}
-
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev_value = *ptr;
-  do {
-    if (!QNXCmpxchg(old_value, new_value,
-                    const_cast<Atomic32*>(ptr))) {
-      return old_value;
-    }
-    prev_value = *ptr;
-  } while (prev_value == old_value);
-  return prev_value;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  Atomic32 old_value;
-  do {
-    old_value = *ptr;
-  } while (QNXCmpxchg(old_value, new_value,
-                      const_cast<Atomic32*>(ptr)));
-  return old_value;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return Barrier_AtomicIncrement(ptr, increment);
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  for (;;) {
-    // Atomic exchange the old value with an incremented one.
-    Atomic32 old_value = *ptr;
-    Atomic32 new_value = old_value + increment;
-    if (QNXCmpxchg(old_value, new_value,
-                   const_cast<Atomic32*>(ptr)) == 0) {
-      // The exchange took place as expected.
-      return new_value;
-    }
-    // Otherwise, *ptr changed mid-loop and we need to retry.
-  }
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void MemoryBarrierInternal() {
-  __sync_synchronize();
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  MemoryBarrierInternal();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value = *ptr;
-  MemoryBarrierInternal();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM_QNX_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_atomicword_compat.h b/src/google/protobuf/stubs/atomicops_internals_atomicword_compat.h
deleted file mode 100644
index eb198ff5..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_atomicword_compat.h
+++ /dev/null
@@ -1,122 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
-
-// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
-// which in turn means int. On some LP32 platforms, intptr_t is an int, but
-// on others, it's a long. When AtomicWord and Atomic32 are based on different
-// fundamental types, their pointers are incompatible.
-//
-// This file defines function overloads to allow both AtomicWord and Atomic32
-// data to be used with this interface.
-//
-// On LP64 platforms, AtomicWord and Atomic64 are both always long,
-// so this problem doesn't occur.
-
-#if !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr,
-                                           AtomicWord old_value,
-                                           AtomicWord new_value) {
-  return NoBarrier_CompareAndSwap(
-      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
-}
-
-inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr,
-                                           AtomicWord new_value) {
-  return NoBarrier_AtomicExchange(
-      reinterpret_cast<volatile Atomic32*>(ptr), new_value);
-}
-
-inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr,
-                                            AtomicWord increment) {
-  return NoBarrier_AtomicIncrement(
-      reinterpret_cast<volatile Atomic32*>(ptr), increment);
-}
-
-inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
-                                          AtomicWord increment) {
-  return Barrier_AtomicIncrement(
-      reinterpret_cast<volatile Atomic32*>(ptr), increment);
-}
-
-inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
-                                         AtomicWord old_value,
-                                         AtomicWord new_value) {
-  return Acquire_CompareAndSwap(
-      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
-}
-
-inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
-                                         AtomicWord old_value,
-                                         AtomicWord new_value) {
-  return Release_CompareAndSwap(
-      reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
-  NoBarrier_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
-}
-
-inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) {
-  return Acquire_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
-}
-
-inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
-  return Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
-}
-
-inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
-  return NoBarrier_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
-}
-
-inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
-  return Acquire_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
-}
-
-inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
-  return Release_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
-}
-
-}   // namespace internal
-}   // namespace protobuf
-}   // namespace google
-
-#endif  // !defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_generic_c11_atomic.h b/src/google/protobuf/stubs/atomicops_internals_generic_c11_atomic.h
deleted file mode 100644
index 44ef9c9e..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_generic_c11_atomic.h
+++ /dev/null
@@ -1,231 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_C11_ATOMIC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_C11_ATOMIC_H_
-
-#include <atomic>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// This implementation is transitional and maintains the original API for
-// atomicops.h. This requires casting memory locations to the atomic types, and
-// assumes that the API and the C++11 implementation are layout-compatible,
-// which isn't true for all implementations or hardware platforms. The static
-// assertion should detect this issue, were it to fire then this header
-// shouldn't be used.
-//
-// TODO(jfb) If this header manages to stay committed then the API should be
-//           modified, and all call sites updated.
-typedef volatile std::atomic<Atomic32>* AtomicLocation32;
-static_assert(sizeof(*(AtomicLocation32) nullptr) == sizeof(Atomic32),
-              "incompatible 32-bit atomic layout");
-
-inline void MemoryBarrierInternal() {
-#if defined(__GLIBCXX__)
-  // Work around libstdc++ bug 51038 where atomic_thread_fence was declared but
-  // not defined, leading to the linker complaining about undefined references.
-  __atomic_thread_fence(std::memory_order_seq_cst);
-#else
-  std::atomic_thread_fence(std::memory_order_seq_cst);
-#endif
-}
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  ((AtomicLocation32)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_relaxed,
-                                std::memory_order_relaxed);
-  return old_value;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  return ((AtomicLocation32)ptr)
-      ->exchange(new_value, std::memory_order_relaxed);
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return increment +
-         ((AtomicLocation32)ptr)
-             ->fetch_add(increment, std::memory_order_relaxed);
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  return increment + ((AtomicLocation32)ptr)->fetch_add(increment);
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  ((AtomicLocation32)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_acquire,
-                                std::memory_order_acquire);
-  return old_value;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  ((AtomicLocation32)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_release,
-                                std::memory_order_relaxed);
-  return old_value;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  ((AtomicLocation32)ptr)->store(value, std::memory_order_relaxed);
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  ((AtomicLocation32)ptr)->store(value, std::memory_order_relaxed);
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  ((AtomicLocation32)ptr)->store(value, std::memory_order_release);
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return ((AtomicLocation32)ptr)->load(std::memory_order_relaxed);
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  return ((AtomicLocation32)ptr)->load(std::memory_order_acquire);
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return ((AtomicLocation32)ptr)->load(std::memory_order_relaxed);
-}
-
-#if defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
-
-typedef volatile std::atomic<Atomic64>* AtomicLocation64;
-static_assert(sizeof(*(AtomicLocation64) nullptr) == sizeof(Atomic64),
-              "incompatible 64-bit atomic layout");
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  ((AtomicLocation64)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_relaxed,
-                                std::memory_order_relaxed);
-  return old_value;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  return ((AtomicLocation64)ptr)
-      ->exchange(new_value, std::memory_order_relaxed);
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  return increment +
-         ((AtomicLocation64)ptr)
-             ->fetch_add(increment, std::memory_order_relaxed);
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                        Atomic64 increment) {
-  return increment + ((AtomicLocation64)ptr)->fetch_add(increment);
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  ((AtomicLocation64)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_acquire,
-                                std::memory_order_acquire);
-  return old_value;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  ((AtomicLocation64)ptr)
-      ->compare_exchange_strong(old_value,
-                                new_value,
-                                std::memory_order_release,
-                                std::memory_order_relaxed);
-  return old_value;
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  ((AtomicLocation64)ptr)->store(value, std::memory_order_relaxed);
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  ((AtomicLocation64)ptr)->store(value, std::memory_order_relaxed);
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  ((AtomicLocation64)ptr)->store(value, std::memory_order_release);
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return ((AtomicLocation64)ptr)->load(std::memory_order_relaxed);
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  return ((AtomicLocation64)ptr)->load(std::memory_order_acquire);
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrierInternal();
-  return ((AtomicLocation64)ptr)->load(std::memory_order_relaxed);
-}
-
-#endif  // defined(GOOGLE_PROTOBUF_ARCH_64_BIT)
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_C11_ATOMIC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_generic_gcc.h b/src/google/protobuf/stubs/atomicops_internals_generic_gcc.h
deleted file mode 100644
index 0b0b06ce..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_generic_gcc.h
+++ /dev/null
@@ -1,155 +0,0 @@
-// Copyright 2013 Red Hat Inc.  All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Red Hat Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  __atomic_compare_exchange_n(ptr, &old_value, new_value, false,
-                              __ATOMIC_RELAXED, __ATOMIC_RELAXED);
-  return old_value;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  return __atomic_exchange_n(ptr, new_value, __ATOMIC_RELAXED);
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return __atomic_add_fetch(ptr, increment, __ATOMIC_RELAXED);
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  return __atomic_add_fetch(ptr, increment, __ATOMIC_SEQ_CST);
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  __atomic_compare_exchange_n(ptr, &old_value, new_value, false,
-                              __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
-  return old_value;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  __atomic_compare_exchange_n(ptr, &old_value, new_value, false,
-                              __ATOMIC_RELEASE, __ATOMIC_ACQUIRE);
-  return old_value;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  __atomic_store_n(ptr, value, __ATOMIC_RELAXED);
-}
-
-inline void MemoryBarrierInternal() {
-  __sync_synchronize();
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  __atomic_store_n(ptr, value, __ATOMIC_SEQ_CST);
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  __atomic_store_n(ptr, value, __ATOMIC_RELEASE);
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return __atomic_load_n(ptr, __ATOMIC_RELAXED);
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  return __atomic_load_n(ptr, __ATOMIC_ACQUIRE);
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  return __atomic_load_n(ptr, __ATOMIC_SEQ_CST);
-}
-
-#ifdef __LP64__
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  __atomic_store_n(ptr, value, __ATOMIC_RELEASE);
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  return __atomic_load_n(ptr, __ATOMIC_ACQUIRE);
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  __atomic_compare_exchange_n(ptr, &old_value, new_value, false,
-                              __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
-  return old_value;
-}
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  __atomic_compare_exchange_n(ptr, &old_value, new_value, false,
-                              __ATOMIC_RELAXED, __ATOMIC_RELAXED);
-  return old_value;
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  return __atomic_add_fetch(ptr, increment, __ATOMIC_RELAXED);
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  __atomic_store_n(ptr, value, __ATOMIC_RELAXED);
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  return __atomic_exchange_n(ptr, new_value, __ATOMIC_RELAXED);
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return __atomic_load_n(ptr, __ATOMIC_RELAXED);
-}
-
-#endif // defined(__LP64__)
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_mips_gcc.h b/src/google/protobuf/stubs/atomicops_internals_mips_gcc.h
deleted file mode 100644
index 6ce6820e..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_mips_gcc.h
+++ /dev/null
@@ -1,313 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MIPS_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MIPS_GCC_H_
-
-#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// Atomically execute:
-//      result = *ptr;
-//      if (*ptr == old_value)
-//        *ptr = new_value;
-//      return result;
-//
-// I.e., replace "*ptr" with "new_value" if "*ptr" used to be "old_value".
-// Always return the old value of "*ptr"
-//
-// This routine implies no memory barriers.
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev, tmp;
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "ll %0, %5\n"  // prev = *ptr
-                       "bne %0, %3, 2f\n"  // if (prev != old_value) goto 2
-                       "move %2, %4\n"  // tmp = new_value
-                       "sc %2, %1\n"  // *ptr = tmp (with atomic check)
-                       "beqz %2, 1b\n"  // start again on atomic error
-                       "nop\n"  // delay slot nop
-                       "2:\n"
-                       ".set pop\n"
-                       : "=&r" (prev), "=m" (*ptr), "=&r" (tmp)
-                       : "r" (old_value), "r" (new_value), "m" (*ptr)
-                       : "memory");
-  return prev;
-}
-
-// Atomically store new_value into *ptr, returning the previous value held in
-// *ptr.  This routine implies no memory barriers.
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  Atomic32 temp, old;
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "ll %1, %4\n"  // old = *ptr
-                       "move %0, %3\n"  // temp = new_value
-                       "sc %0, %2\n"  // *ptr = temp (with atomic check)
-                       "beqz %0, 1b\n"  // start again on atomic error
-                       "nop\n"  // delay slot nop
-                       ".set pop\n"
-                       : "=&r" (temp), "=&r" (old), "=m" (*ptr)
-                       : "r" (new_value), "m" (*ptr)
-                       : "memory");
-
-  return old;
-}
-
-// Atomically increment *ptr by "increment".  Returns the new value of
-// *ptr with the increment applied.  This routine implies no memory barriers.
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  Atomic32 temp, temp2;
-
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "ll %0, %4\n"  // temp = *ptr
-                       "addu %1, %0, %3\n"  // temp2 = temp + increment
-                       "sc %1, %2\n"  // *ptr = temp2 (with atomic check)
-                       "beqz %1, 1b\n"  // start again on atomic error
-                       "addu %1, %0, %3\n"  // temp2 = temp + increment
-                       ".set pop\n"
-                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
-                       : "Ir" (increment), "m" (*ptr)
-                       : "memory");
-  // temp2 now holds the final value.
-  return temp2;
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  ATOMICOPS_COMPILER_BARRIER();
-  Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
-  ATOMICOPS_COMPILER_BARRIER();
-  return res;
-}
-
-// "Acquire" operations
-// ensure that no later memory access can be reordered ahead of the operation.
-// "Release" operations ensure that no previous memory access can be reordered
-// after the operation.  "Barrier" operations have both "Acquire" and "Release"
-// semantics.   A MemoryBarrierInternal() has "Barrier" semantics, but does no
-// memory access.
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  ATOMICOPS_COMPILER_BARRIER();
-  Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  ATOMICOPS_COMPILER_BARRIER();
-  return res;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  ATOMICOPS_COMPILER_BARRIER();
-  Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  ATOMICOPS_COMPILER_BARRIER();
-  return res;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void MemoryBarrierInternal() {
-  __asm__ __volatile__("sync" : : : "memory");
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  MemoryBarrierInternal();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value = *ptr;
-  MemoryBarrierInternal();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-#if defined(__LP64__)
-// 64-bit versions of the atomic ops.
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 prev, tmp;
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "lld %0, %5\n"  // prev = *ptr
-                       "bne %0, %3, 2f\n"  // if (prev != old_value) goto 2
-                       "move %2, %4\n"  // tmp = new_value
-                       "scd %2, %1\n"  // *ptr = tmp (with atomic check)
-                       "beqz %2, 1b\n"  // start again on atomic error
-                       "nop\n"  // delay slot nop
-                       "2:\n"
-                       ".set pop\n"
-                       : "=&r" (prev), "=m" (*ptr), "=&r" (tmp)
-                       : "r" (old_value), "r" (new_value), "m" (*ptr)
-                       : "memory");
-  return prev;
-}
-
-// Atomically store new_value into *ptr, returning the previous value held in
-// *ptr.  This routine implies no memory barriers.
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  Atomic64 temp, old;
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "lld %1, %4\n"  // old = *ptr
-                       "move %0, %3\n"  // temp = new_value
-                       "scd %0, %2\n"  // *ptr = temp (with atomic check)
-                       "beqz %0, 1b\n"  // start again on atomic error
-                       "nop\n"  // delay slot nop
-                       ".set pop\n"
-                       : "=&r" (temp), "=&r" (old), "=m" (*ptr)
-                       : "r" (new_value), "m" (*ptr)
-                       : "memory");
-
-  return old;
-}
-
-// Atomically increment *ptr by "increment".  Returns the new value of
-// *ptr with the increment applied.  This routine implies no memory barriers.
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  Atomic64 temp, temp2;
-
-  __asm__ __volatile__(".set push\n"
-                       ".set noreorder\n"
-                       "1:\n"
-                       "lld %0, %4\n"  // temp = *ptr
-                       "daddu %1, %0, %3\n"  // temp2 = temp + increment
-                       "scd %1, %2\n"  // *ptr = temp2 (with atomic check)
-                       "beqz %1, 1b\n"  // start again on atomic error
-                       "daddu %1, %0, %3\n"  // temp2 = temp + increment
-                       ".set pop\n"
-                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
-                       : "Ir" (increment), "m" (*ptr)
-                       : "memory");
-  // temp2 now holds the final value.
-  return temp2;
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                        Atomic64 increment) {
-  MemoryBarrierInternal();
-  Atomic64 res = NoBarrier_AtomicIncrement(ptr, increment);
-  MemoryBarrierInternal();
-  return res;
-}
-
-// "Acquire" operations
-// ensure that no later memory access can be reordered ahead of the operation.
-// "Release" operations ensure that no previous memory access can be reordered
-// after the operation.  "Barrier" operations have both "Acquire" and "Release"
-// semantics.   A MemoryBarrierInternal() has "Barrier" semantics, but does no
-// memory access.
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-  return res;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  MemoryBarrierInternal();
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  MemoryBarrierInternal();
-  *ptr = value;
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 value = *ptr;
-  MemoryBarrierInternal();
-  return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-#endif
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#undef ATOMICOPS_COMPILER_BARRIER
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_MIPS_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_power.h b/src/google/protobuf/stubs/atomicops_internals_power.h
deleted file mode 100644
index cad9f1e3..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_power.h
+++ /dev/null
@@ -1,440 +0,0 @@
-// Copyright 2014 Bloomberg Finance LP. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Bloomberg Finance LP. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_AIX_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_AIX_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 result;
-
-  asm volatile (
-      "1:     lwarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpw %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-      "       stwcx. %[val], %[zero], %[obj]  \n\t"  // store new value
-      "       bne- 1b                         \n\t"
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  Atomic32 result;
-
-  asm volatile (
-      "1:     lwarx %[res], %[zero], %[obj]       \n\t"
-      "       stwcx. %[val], %[zero], %[obj]      \n\t"
-      "       bne- 1b                             \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  Atomic32 result;
-
-  asm volatile (
-      "1:     lwarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       add %[res], %[val], %[res]      \n\t"  // add the operand
-      "       stwcx. %[res], %[zero], %[obj]  \n\t"  // store old value
-                                                     // if still reserved
-      "       bne- 1b                         \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (increment),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline void MemoryBarrierInternal(void) {
-  asm volatile (
-      "       lwsync                          \n\t"
-      "       isync                           \n\t"
-              :
-              :
-              : "memory");
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  Atomic32 result;
-
-  asm volatile (
-      "       lwsync                          \n\t"
-
-      "1:     lwarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       add %[res], %[val], %[res]      \n\t"  // add the operand
-      "       stwcx. %[res], %[zero], %[obj]  \n\t"  // store old value
-                                                     // if still reserved
-      "       bne- 1b                         \n\t"
-      "       isync                           \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (increment),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 result;
-
-  asm volatile (
-      "1:     lwarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpw %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-      "       stwcx. %[val], %[zero], %[obj]  \n\t"  // store new value
-      "       bne- 1b                         \n\t"
-
-      "       isync                           \n\t"
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 result;
-
-  asm volatile (
-      "       lwsync                          \n\t"
-
-      "1:     lwarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpw %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-      "       stwcx. %[val], %[zero], %[obj]  \n\t"  // store new value
-      "       bne- 1b                         \n\t"
-
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  asm volatile (
-      "       stw %[val], %[obj]      \n\t"
-      "       isync                   \n\t"
-              : [obj] "=m" (*ptr)
-              : [val]  "b"  (value));
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  asm volatile (
-      "       lwsync                  \n\t"
-      "       stw %[val], %[obj]      \n\t"
-              : [obj] "=m" (*ptr)
-              : [val]  "b"  (value));
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 result;
-
-  asm volatile (
-      "1:     lwz %[res], %[obj]              \n\t"
-      "       cmpw %[res], %[res]             \n\t" // create data
-                                                    // dependency for
-                                                    // load/load ordering
-      "       bne- 1b                         \n\t" // never taken
-
-      "       isync                           \n\t"
-              : [res]  "=b" (result)
-              : [obj]  "m"  (*ptr),
-                [zero] "i"  (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  Atomic32 result;
-
-  asm volatile (
-      "       lwsync                          \n\t"
-
-      "1:     lwz %[res], %[obj]              \n\t"
-      "       cmpw %[res], %[res]             \n\t" // create data
-                                                    // dependency for
-                                                    // load/load ordering
-      "       bne- 1b                         \n\t" // never taken
-              : [res]  "=b" (result)
-              : [obj]  "m"  (*ptr),
-                [zero] "i"  (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-#ifdef GOOGLE_PROTOBUF_ARCH_64_BIT
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 result;
-
-  asm volatile (
-      "1:     ldarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpd %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-
-      "       stdcx. %[val], %[zero], %[obj]  \n\t"  // store the new value
-      "       bne- 1b                         \n\t"
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  Atomic64 result;
-
-  asm volatile (
-      "1:     ldarx %[res], %[zero], %[obj]       \n\t"
-      "       stdcx. %[val], %[zero], %[obj]      \n\t"
-      "       bne- 1b                             \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  Atomic64 result;
-
-  asm volatile (
-      "1:     ldarx %[res], %[zero], %[obj]   \n\t" // load and reserve
-      "       add %[res], %[res], %[val]      \n\t" // add the operand
-      "       stdcx. %[res], %[zero], %[obj]  \n\t" // store old value if
-                                                    // still reserved
-
-      "       bne- 1b                         \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (increment),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                        Atomic64 increment) {
-
-  Atomic64 result;
-
-  asm volatile (
-      "       lwsync                          \n\t"
-
-      "1:     ldarx %[res], %[zero], %[obj]   \n\t" // load and reserve
-      "       add %[res], %[res], %[val]      \n\t" // add the operand
-      "       stdcx. %[res], %[zero], %[obj]  \n\t" // store old value if
-                                                    // still reserved
-
-      "       bne- 1b                         \n\t"
-
-      "       isync                           \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [val]  "b"   (increment),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 result;
-
-  asm volatile (
-      "1:     ldarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpd %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-
-      "       stdcx. %[val], %[zero], %[obj]  \n\t"  // store the new value
-      "       bne- 1b                         \n\t"
-      "       isync                           \n\t"
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 result;
-
-  asm volatile (
-      "       lwsync                          \n\t"
-
-      "1:     ldarx %[res], %[zero], %[obj]   \n\t"  // load and reserve
-      "       cmpd %[cmp], %[res]             \n\t"  // compare values
-      "       bne- 2f                         \n\t"
-
-      "       stdcx. %[val], %[zero], %[obj]  \n\t"  // store the new value
-      "       bne- 1b                         \n\t"
-      "2:                                     \n\t"
-              : [res]  "=&b" (result)
-              : [obj]  "b"   (ptr),
-                [cmp]  "b"   (old_value),
-                [val]  "b"   (new_value),
-                [zero] "i"   (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  asm volatile (
-      "       std %[val], %[obj]          \n\t"
-      "       isync                       \n\t"
-              : [obj] "=m" (*ptr)
-              : [val] "b"  (value));
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  asm volatile (
-      "       lwsync                      \n\t"
-      "       std %[val], %[obj]          \n\t"
-              : [obj] "=m" (*ptr)
-              : [val] "b"  (value));
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 result;
-
-  asm volatile (
-      "1:     ld %[res], %[obj]                   \n\t"
-      "       cmpd %[res], %[res]                 \n\t" // create data
-                                                        // dependency for
-                                                        // load/load ordering
-      "       bne- 1b                             \n\t" // never taken
-
-      "       isync                               \n\t"
-              : [res]  "=b" (result)
-              : [obj]  "m"  (*ptr),
-                [zero] "i"  (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  Atomic64 result;
-
-  asm volatile (
-      "       lwsync                              \n\t"
-
-      "1:     ld %[res], %[obj]                   \n\t"
-      "       cmpd %[res], %[res]                 \n\t" // create data
-                                                        // dependency for
-                                                        // load/load ordering
-      "       bne- 1b                             \n\t" // never taken
-              : [res]  "=b" (result)
-              : [obj]  "m"  (*ptr),
-                [zero] "i"  (0)
-              : "cr0", "ctr");
-
-  return result;
-}
-#endif
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_SPARC_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h b/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h
deleted file mode 100644
index d477dc6d..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_ppc_gcc.h
+++ /dev/null
@@ -1,155 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: ogabbay@advaoptical.com (Oded Gabbay)
-// Cleaned up by: bsilver16384@gmail.com (Brian Silverman)
-//
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
-
-#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev;
-
-  __asm__ __volatile__(
-      "0:                                  \n\t"
-      "lwarx %[prev],0,%[ptr]              \n\t"
-      "cmpw 0,%[prev],%[old_value]         \n\t"
-      "bne- 1f                             \n\t"
-      "stwcx. %[new_value],0,%[ptr]        \n\t"
-      "bne- 0b                             \n\t"
-      "1:                                  \n\t"
-      : [prev] "=&r"(prev), "+m"(*ptr)
-      : [ptr] "r"(ptr), [old_value] "r"(old_value), [new_value] "r"(new_value)
-      : "cc", "memory");
-
-  return prev;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
-                                         Atomic32 new_value) {
-  Atomic32 old;
-
-  __asm__ __volatile__(
-      "0:                                  \n\t"
-      "lwarx %[old],0,%[ptr]               \n\t"
-      "stwcx. %[new_value],0,%[ptr]        \n\t"
-      "bne- 0b                             \n\t"
-      : [old] "=&r"(old), "+m"(*ptr)
-      : [ptr] "r"(ptr), [new_value] "r"(new_value)
-      : "cc", "memory");
-
-  return old;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                          Atomic32 increment) {
-  Atomic32 temp;
-
-  __asm__ __volatile__(
-      "0:                                  \n\t"
-      "lwarx %[temp],0,%[ptr]              \n\t"
-      "add %[temp],%[increment],%[temp]    \n\t"
-      "stwcx. %[temp],0,%[ptr]             \n\t"
-      "bne- 0b                             \n\t"
-      : [temp] "=&r"(temp)
-      : [increment] "r"(increment), [ptr] "r"(ptr)
-      : "cc", "memory");
-
-  return temp;
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                        Atomic32 increment) {
-  MemoryBarrierInternal();
-  Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
-  MemoryBarrierInternal();
-  return res;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value, Atomic32 new_value) {
-  Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-  return res;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value, Atomic32 new_value) {
-  MemoryBarrierInternal();
-  Atomic32 res = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  return res;
-}
-
-inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void MemoryBarrierInternal() { __asm__ __volatile__("sync" : : : "memory"); }
-
-inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  MemoryBarrierInternal();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) { return *ptr; }
-
-inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
-  Atomic32 value = *ptr;
-  MemoryBarrierInternal();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#undef ATOMICOPS_COMPILER_BARRIER
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_PPC_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_solaris.h b/src/google/protobuf/stubs/atomicops_internals_solaris.h
deleted file mode 100644
index baecb993..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_solaris.h
+++ /dev/null
@@ -1,188 +0,0 @@
-// Copyright 2014 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_SPARC_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_SPARC_GCC_H_
-
-#include <atomic.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  return (Atomic32)atomic_cas_32((volatile uint32_t*)ptr, (uint32_t)old_value, (uint32_t)new_value);
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  return (Atomic32)atomic_swap_32((volatile uint32_t*)ptr, (uint32_t)new_value);
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return (Atomic32)atomic_add_32_nv((volatile uint32_t*)ptr, (uint32_t)increment);
-}
-
-inline void MemoryBarrierInternal(void) {
-	membar_producer();
-	membar_consumer();
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  MemoryBarrierInternal();
-  Atomic32 ret = NoBarrier_AtomicIncrement(ptr, increment);
-  MemoryBarrierInternal();
-
-  return ret;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 ret = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-
-  return ret;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  MemoryBarrierInternal();
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  membar_producer();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  membar_consumer();
-  *ptr = value;
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 val = *ptr;
-  membar_consumer();
-  return val;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  membar_producer();
-  return *ptr;
-}
-
-#ifdef GOOGLE_PROTOBUF_ARCH_64_BIT
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  return atomic_cas_64((volatile uint64_t*)ptr, (uint64_t)old_value, (uint64_t)new_value);
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr, Atomic64 new_value) {
-  return atomic_swap_64((volatile uint64_t*)ptr, (uint64_t)new_value);
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment) {
-  return atomic_add_64_nv((volatile uint64_t*)ptr, increment);
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr, Atomic64 increment) {
-  MemoryBarrierInternal();
-  Atomic64 ret = atomic_add_64_nv((volatile uint64_t*)ptr, increment);
-  MemoryBarrierInternal();
-  return ret;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 ret = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  MemoryBarrierInternal();
-  return ret;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  MemoryBarrierInternal();
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-  membar_producer();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  membar_consumer();
-  *ptr = value;
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 ret = *ptr;
-  membar_consumer();
-  return ret;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  membar_producer();
-  return *ptr;
-}
-#endif
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_SPARC_GCC_H_
-
diff --git a/src/google/protobuf/stubs/atomicops_internals_tsan.h b/src/google/protobuf/stubs/atomicops_internals_tsan.h
deleted file mode 100644
index 676380b1..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_tsan.h
+++ /dev/null
@@ -1,219 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2013 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation for compiler-based
-// ThreadSanitizer (http://clang.llvm.org/docs/ThreadSanitizer.html).
-// Use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_TSAN_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_TSAN_H_
-
-#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
-
-#include <sanitizer/tsan_interface_atomic.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 cmp = old_value;
-  __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_relaxed, __tsan_memory_order_relaxed);
-  return cmp;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
-                                         Atomic32 new_value) {
-  return __tsan_atomic32_exchange(ptr, new_value,
-      __tsan_memory_order_relaxed);
-}
-
-inline Atomic32 Acquire_AtomicExchange(volatile Atomic32 *ptr,
-                                       Atomic32 new_value) {
-  return __tsan_atomic32_exchange(ptr, new_value,
-      __tsan_memory_order_acquire);
-}
-
-inline Atomic32 Release_AtomicExchange(volatile Atomic32 *ptr,
-                                       Atomic32 new_value) {
-  return __tsan_atomic32_exchange(ptr, new_value,
-      __tsan_memory_order_release);
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                          Atomic32 increment) {
-  return increment + __tsan_atomic32_fetch_add(ptr, increment,
-      __tsan_memory_order_relaxed);
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
-                                        Atomic32 increment) {
-  return increment + __tsan_atomic32_fetch_add(ptr, increment,
-      __tsan_memory_order_acq_rel);
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 cmp = old_value;
-  __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_acquire, __tsan_memory_order_acquire);
-  return cmp;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 cmp = old_value;
-  __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_release, __tsan_memory_order_relaxed);
-  return cmp;
-}
-
-inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
-}
-
-inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
-  __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
-}
-
-inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
-  __tsan_atomic32_store(ptr, value, __tsan_memory_order_release);
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) {
-  return __tsan_atomic32_load(ptr, __tsan_memory_order_relaxed);
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
-  return __tsan_atomic32_load(ptr, __tsan_memory_order_acquire);
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
-  __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
-  return __tsan_atomic32_load(ptr, __tsan_memory_order_relaxed);
-}
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 cmp = old_value;
-  __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_relaxed, __tsan_memory_order_relaxed);
-  return cmp;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
-                                         Atomic64 new_value) {
-  return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_relaxed);
-}
-
-inline Atomic64 Acquire_AtomicExchange(volatile Atomic64 *ptr,
-                                       Atomic64 new_value) {
-  return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_acquire);
-}
-
-inline Atomic64 Release_AtomicExchange(volatile Atomic64 *ptr,
-                                       Atomic64 new_value) {
-  return __tsan_atomic64_exchange(ptr, new_value, __tsan_memory_order_release);
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr,
-                                          Atomic64 increment) {
-  return increment + __tsan_atomic64_fetch_add(ptr, increment,
-      __tsan_memory_order_relaxed);
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr,
-                                        Atomic64 increment) {
-  return increment + __tsan_atomic64_fetch_add(ptr, increment,
-      __tsan_memory_order_acq_rel);
-}
-
-inline void NoBarrier_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  __tsan_atomic64_store(ptr, value, __tsan_memory_order_relaxed);
-}
-
-inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  __tsan_atomic64_store(ptr, value, __tsan_memory_order_relaxed);
-  __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
-}
-
-inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) {
-  __tsan_atomic64_store(ptr, value, __tsan_memory_order_release);
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64 *ptr) {
-  return __tsan_atomic64_load(ptr, __tsan_memory_order_relaxed);
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) {
-  return __tsan_atomic64_load(ptr, __tsan_memory_order_acquire);
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64 *ptr) {
-  __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
-  return __tsan_atomic64_load(ptr, __tsan_memory_order_relaxed);
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 cmp = old_value;
-  __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_acquire, __tsan_memory_order_acquire);
-  return cmp;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 cmp = old_value;
-  __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
-      __tsan_memory_order_release, __tsan_memory_order_relaxed);
-  return cmp;
-}
-
-inline void MemoryBarrierInternal() {
-  __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
-}
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#undef ATOMICOPS_COMPILER_BARRIER
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_TSAN_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc b/src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc
deleted file mode 100644
index 53c9eae0..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_x86_gcc.cc
+++ /dev/null
@@ -1,137 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This module gets enough CPU information to optimize the
-// atomicops module on x86.
-
-#include <cstring>
-
-#include <google/protobuf/stubs/atomicops.h>
-
-// This file only makes sense with atomicops_internals_x86_gcc.h -- it
-// depends on structs that are defined in that file.  If atomicops.h
-// doesn't sub-include that file, then we aren't needed, and shouldn't
-// try to do anything.
-#ifdef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_GCC_H_
-
-// Inline cpuid instruction.  In PIC compilations, %ebx contains the address
-// of the global offset table.  To avoid breaking such executables, this code
-// must preserve that register's value across cpuid instructions.
-#if defined(__i386__)
-#define cpuid(a, b, c, d, inp) \
-  asm("mov %%ebx, %%edi\n"     \
-      "cpuid\n"                \
-      "xchg %%edi, %%ebx\n"    \
-      : "=a" (a), "=D" (b), "=c" (c), "=d" (d) : "a" (inp))
-#elif defined(__x86_64__)
-#define cpuid(a, b, c, d, inp) \
-  asm("mov %%rbx, %%rdi\n"     \
-      "cpuid\n"                \
-      "xchg %%rdi, %%rbx\n"    \
-      : "=a" (a), "=D" (b), "=c" (c), "=d" (d) : "a" (inp))
-#endif
-
-#if defined(cpuid)        // initialize the struct only on x86
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// Set the flags so that code will run correctly and conservatively, so even
-// if we haven't been initialized yet, we're probably single threaded, and our
-// default values should hopefully be pretty safe.
-struct AtomicOps_x86CPUFeatureStruct AtomicOps_Internalx86CPUFeatures = {
-  false,          // bug can't exist before process spawns multiple threads
-  false,          // no SSE2
-};
-
-namespace {
-
-// Initialize the AtomicOps_Internalx86CPUFeatures struct.
-void AtomicOps_Internalx86CPUFeaturesInit() {
-  uint32_t eax;
-  uint32_t ebx;
-  uint32_t ecx;
-  uint32_t edx;
-
-  // Get vendor string (issue CPUID with eax = 0)
-  cpuid(eax, ebx, ecx, edx, 0);
-  char vendor[13];
-  memcpy(vendor, &ebx, 4);
-  memcpy(vendor + 4, &edx, 4);
-  memcpy(vendor + 8, &ecx, 4);
-  vendor[12] = 0;
-
-  // get feature flags in ecx/edx, and family/model in eax
-  cpuid(eax, ebx, ecx, edx, 1);
-
-  int family = (eax >> 8) & 0xf;        // family and model fields
-  int model = (eax >> 4) & 0xf;
-  if (family == 0xf) {                  // use extended family and model fields
-    family += (eax >> 20) & 0xff;
-    model += ((eax >> 16) & 0xf) << 4;
-  }
-
-  // Opteron Rev E has a bug in which on very rare occasions a locked
-  // instruction doesn't act as a read-acquire barrier if followed by a
-  // non-locked read-modify-write instruction.  Rev F has this bug in
-  // pre-release versions, but not in versions released to customers,
-  // so we test only for Rev E, which is family 15, model 32..63 inclusive.
-  if (strcmp(vendor, "AuthenticAMD") == 0 &&       // AMD
-      family == 15 &&
-      32 <= model && model <= 63) {
-    AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug = true;
-  } else {
-    AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug = false;
-  }
-
-  // edx bit 26 is SSE2 which we use to tell use whether we can use mfence
-  AtomicOps_Internalx86CPUFeatures.has_sse2 = ((edx >> 26) & 1);
-}
-
-class AtomicOpsx86Initializer {
- public:
-  AtomicOpsx86Initializer() {
-    AtomicOps_Internalx86CPUFeaturesInit();
-  }
-};
-
-// A global to get use initialized on startup via static initialization :/
-AtomicOpsx86Initializer g_initer;
-
-}  // namespace
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // __i386__
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_x86_gcc.h b/src/google/protobuf/stubs/atomicops_internals_x86_gcc.h
deleted file mode 100644
index e80121fd..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_x86_gcc.h
+++ /dev/null
@@ -1,293 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_GCC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// This struct is not part of the public API of this module; clients may not
-// use it.
-// Features of this x86.  Values may not be correct before main() is run,
-// but are set conservatively.
-struct AtomicOps_x86CPUFeatureStruct {
-  bool has_amd_lock_mb_bug;  // Processor has AMD memory-barrier bug; do lfence
-                             // after acquire compare-and-swap.
-  bool has_sse2;             // Processor has SSE2.
-};
-extern struct AtomicOps_x86CPUFeatureStruct AtomicOps_Internalx86CPUFeatures;
-
-#define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory")
-
-// 32-bit low-level operations on any platform.
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                         Atomic32 old_value,
-                                         Atomic32 new_value) {
-  Atomic32 prev;
-  __asm__ __volatile__("lock; cmpxchgl %1,%2"
-                       : "=a" (prev)
-                       : "q" (new_value), "m" (*ptr), "0" (old_value)
-                       : "memory");
-  return prev;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                         Atomic32 new_value) {
-  __asm__ __volatile__("xchgl %1,%0"  // The lock prefix is implicit for xchg.
-                       : "=r" (new_value)
-                       : "m" (*ptr), "0" (new_value)
-                       : "memory");
-  return new_value;  // Now it's the previous value.
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  Atomic32 temp = increment;
-  __asm__ __volatile__("lock; xaddl %0,%1"
-                       : "+r" (temp), "+m" (*ptr)
-                       : : "memory");
-  // temp now holds the old value of *ptr
-  return temp + increment;
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                        Atomic32 increment) {
-  Atomic32 temp = increment;
-  __asm__ __volatile__("lock; xaddl %0,%1"
-                       : "+r" (temp), "+m" (*ptr)
-                       : : "memory");
-  // temp now holds the old value of *ptr
-  if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
-    __asm__ __volatile__("lfence" : : : "memory");
-  }
-  return temp + increment;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  Atomic32 x = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
-    __asm__ __volatile__("lfence" : : : "memory");
-  }
-  return x;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-#if defined(__x86_64__)
-
-// 64-bit implementations of memory barrier can be simpler, because it
-// "mfence" is guaranteed to exist.
-inline void MemoryBarrierInternal() {
-  __asm__ __volatile__("mfence" : : : "memory");
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-#else
-
-inline void MemoryBarrierInternal() {
-  if (AtomicOps_Internalx86CPUFeatures.has_sse2) {
-    __asm__ __volatile__("mfence" : : : "memory");
-  } else {  // mfence is faster but not present on PIII
-    Atomic32 x = 0;
-    NoBarrier_AtomicExchange(&x, 0);  // acts as a barrier on PIII
-  }
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  if (AtomicOps_Internalx86CPUFeatures.has_sse2) {
-    *ptr = value;
-    __asm__ __volatile__("mfence" : : : "memory");
-  } else {
-    NoBarrier_AtomicExchange(ptr, value);
-                          // acts as a barrier on PIII
-  }
-}
-#endif
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  ATOMICOPS_COMPILER_BARRIER();
-  *ptr = value;  // An x86 store acts as a release barrier.
-  // See comments in Atomic64 version of Release_Store(), below.
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value = *ptr;  // An x86 load acts as a acquire barrier.
-  // See comments in Atomic64 version of Release_Store(), below.
-  ATOMICOPS_COMPILER_BARRIER();
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-#if defined(__x86_64__)
-
-// 64-bit low-level operations on 64-bit platform.
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                         Atomic64 old_value,
-                                         Atomic64 new_value) {
-  Atomic64 prev;
-  __asm__ __volatile__("lock; cmpxchgq %1,%2"
-                       : "=a" (prev)
-                       : "q" (new_value), "m" (*ptr), "0" (old_value)
-                       : "memory");
-  return prev;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                         Atomic64 new_value) {
-  __asm__ __volatile__("xchgq %1,%0"  // The lock prefix is implicit for xchg.
-                       : "=r" (new_value)
-                       : "m" (*ptr), "0" (new_value)
-                       : "memory");
-  return new_value;  // Now it's the previous value.
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  Atomic64 temp = increment;
-  __asm__ __volatile__("lock; xaddq %0,%1"
-                       : "+r" (temp), "+m" (*ptr)
-                       : : "memory");
-  // temp now contains the previous value of *ptr
-  return temp + increment;
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                        Atomic64 increment) {
-  Atomic64 temp = increment;
-  __asm__ __volatile__("lock; xaddq %0,%1"
-                       : "+r" (temp), "+m" (*ptr)
-                       : : "memory");
-  // temp now contains the previous value of *ptr
-  if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
-    __asm__ __volatile__("lfence" : : : "memory");
-  }
-  return temp + increment;
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-  MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  ATOMICOPS_COMPILER_BARRIER();
-
-  *ptr = value;  // An x86 store acts as a release barrier
-                 // for current AMD/Intel chips as of Jan 2008.
-                 // See also Acquire_Load(), below.
-
-  // When new chips come out, check:
-  //  IA-32 Intel Architecture Software Developer's Manual, Volume 3:
-  //  System Programming Guide, Chatper 7: Multiple-processor management,
-  //  Section 7.2, Memory Ordering.
-  // Last seen at:
-  //   http://developer.intel.com/design/pentium4/manuals/index_new.htm
-  //
-  // x86 stores/loads fail to act as barriers for a few instructions (clflush
-  // maskmovdqu maskmovq movntdq movnti movntpd movntps movntq) but these are
-  // not generated by the compiler, and are rare.  Users of these instructions
-  // need to know about cache behaviour in any case since all of these involve
-  // either flushing cache lines or non-temporal cache hints.
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 value = *ptr;  // An x86 load acts as a acquire barrier,
-                          // for current AMD/Intel chips as of Jan 2008.
-                          // See also Release_Store(), above.
-  ATOMICOPS_COMPILER_BARRIER();
-  return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  Atomic64 x = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-  if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
-    __asm__ __volatile__("lfence" : : : "memory");
-  }
-  return x;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-#endif  // defined(__x86_64__)
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#undef ATOMICOPS_COMPILER_BARRIER
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_GCC_H_
diff --git a/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc b/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc
deleted file mode 100644
index 74a1bd4e..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc
+++ /dev/null
@@ -1,113 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// The compilation of extension_set.cc fails when windows.h is included.
-// Therefore we move the code depending on windows.h to this separate cc file.
-
-// Don't compile this file for people not concerned about thread safety.
-#ifndef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-#include <google/protobuf/stubs/atomicops.h>
-
-#ifdef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
-
-#include <windows.h>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline void MemoryBarrierInternal() {
-  // On ARM this is a define while on x86/x64 this is
-  // a function declared in WinNT.h
-  MemoryBarrier();
-}
-
-Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
-                                  Atomic32 old_value,
-                                  Atomic32 new_value) {
-  LONG result = InterlockedCompareExchange(
-      reinterpret_cast<volatile LONG*>(ptr),
-      static_cast<LONG>(new_value),
-      static_cast<LONG>(old_value));
-  return static_cast<Atomic32>(result);
-}
-
-Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
-                                  Atomic32 new_value) {
-  LONG result = InterlockedExchange(
-      reinterpret_cast<volatile LONG*>(ptr),
-      static_cast<LONG>(new_value));
-  return static_cast<Atomic32>(result);
-}
-
-Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
-                                 Atomic32 increment) {
-  return InterlockedExchangeAdd(
-      reinterpret_cast<volatile LONG*>(ptr),
-      static_cast<LONG>(increment)) + increment;
-}
-
-#if defined(_WIN64)
-
-// 64-bit low-level operations on 64-bit platform.
-
-Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
-                                  Atomic64 old_value,
-                                  Atomic64 new_value) {
-  PVOID result = InterlockedCompareExchangePointer(
-    reinterpret_cast<volatile PVOID*>(ptr),
-    reinterpret_cast<PVOID>(new_value), reinterpret_cast<PVOID>(old_value));
-  return reinterpret_cast<Atomic64>(result);
-}
-
-Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
-                                  Atomic64 new_value) {
-  PVOID result = InterlockedExchangePointer(
-    reinterpret_cast<volatile PVOID*>(ptr),
-    reinterpret_cast<PVOID>(new_value));
-  return reinterpret_cast<Atomic64>(result);
-}
-
-Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
-                                 Atomic64 increment) {
-  return InterlockedExchangeAdd64(
-      reinterpret_cast<volatile LONGLONG*>(ptr),
-      static_cast<LONGLONG>(increment)) + increment;
-}
-
-#endif  // defined(_WIN64)
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
-#endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
diff --git a/src/google/protobuf/stubs/atomicops_internals_x86_msvc.h b/src/google/protobuf/stubs/atomicops_internals_x86_msvc.h
deleted file mode 100644
index 34d60d98..00000000
--- a/src/google/protobuf/stubs/atomicops_internals_x86_msvc.h
+++ /dev/null
@@ -1,150 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
-                                          Atomic32 increment) {
-  return Barrier_AtomicIncrement(ptr, increment);
-}
-
-#if !(defined(_MSC_VER) && _MSC_VER >= 1400)
-#error "We require at least vs2005 for MemoryBarrier"
-#endif
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
-                                       Atomic32 old_value,
-                                       Atomic32 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
-  NoBarrier_AtomicExchange(ptr, value);
-              // acts as a barrier in this implementation
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
-  *ptr = value;  // works w/o barrier for current Intel chips as of June 2005
-  // See comments in Atomic64 version of Release_Store() below.
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
-  return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
-  Atomic32 value = *ptr;
-  return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-#if defined(_WIN64)
-
-// 64-bit low-level operations on 64-bit platform.
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
-                                          Atomic64 increment) {
-  return Barrier_AtomicIncrement(ptr, increment);
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
-  NoBarrier_AtomicExchange(ptr, value);
-              // acts as a barrier in this implementation
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
-  *ptr = value;  // works w/o barrier for current Intel chips as of June 2005
-
-  // When new chips come out, check:
-  //  IA-32 Intel Architecture Software Developer's Manual, Volume 3:
-  //  System Programming Guide, Chatper 7: Multiple-processor management,
-  //  Section 7.2, Memory Ordering.
-  // Last seen at:
-  //   http://developer.intel.com/design/pentium4/manuals/index_new.htm
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
-  return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
-  Atomic64 value = *ptr;
-  return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrierInternal();
-  return *ptr;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
-                                       Atomic64 old_value,
-                                       Atomic64 new_value) {
-  return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-}
-
-#endif  // defined(_WIN64)
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
diff --git a/src/google/protobuf/stubs/bytestream.h b/src/google/protobuf/stubs/bytestream.h
index 07604e17..86510d14 100644
--- a/src/google/protobuf/stubs/bytestream.h
+++ b/src/google/protobuf/stubs/bytestream.h
@@ -64,7 +64,7 @@ namespace protobuf {
 namespace strings {
 
 // An abstract interface for an object that consumes a sequence of bytes. This
-// interface offers 3 different ways to append data, and a Flush() function.
+// interface offers a way to append data as well as a Flush() function.
 //
 // Example:
 //
diff --git a/src/google/protobuf/stubs/callback.h b/src/google/protobuf/stubs/callback.h
index 9ec04979..6888f136 100644
--- a/src/google/protobuf/stubs/callback.h
+++ b/src/google/protobuf/stubs/callback.h
@@ -1,8 +1,9 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_CALLBACK_H_
 #define GOOGLE_PROTOBUF_STUBS_CALLBACK_H_
 
+#include <type_traits>
+
 #include <google/protobuf/stubs/macros.h>
-#include <google/protobuf/stubs/type_traits.h>
 
 // ===================================================================
 // emulates google3/base/callback.h
@@ -342,7 +343,7 @@ class FunctionResultCallback_1_1 : public ResultCallback1<R, A1> {
 
 template <typename T>
 struct InternalConstRef {
-  typedef typename remove_reference<T>::type base_type;
+  typedef typename std::remove_reference<T>::type base_type;
   typedef const base_type& type;
 };
 
@@ -397,11 +398,11 @@ class MethodResultCallback_5_2 : public ResultCallback2<R, A1, A2> {
   T* object_;
   MethodType method_;
   bool self_deleting_;
-  typename remove_reference<P1>::type p1_;
-  typename remove_reference<P2>::type p2_;
-  typename remove_reference<P3>::type p3_;
-  typename remove_reference<P4>::type p4_;
-  typename remove_reference<P5>::type p5_;
+  typename std::remove_reference<P1>::type p1_;
+  typename std::remove_reference<P2>::type p2_;
+  typename std::remove_reference<P3>::type p3_;
+  typename std::remove_reference<P4>::type p4_;
+  typename std::remove_reference<P5>::type p5_;
 };
 
 }  // namespace internal
diff --git a/src/google/protobuf/stubs/casts.h b/src/google/protobuf/stubs/casts.h
index be652849..35e2dba0 100644
--- a/src/google/protobuf/stubs/casts.h
+++ b/src/google/protobuf/stubs/casts.h
@@ -31,8 +31,9 @@
 #ifndef GOOGLE_PROTOBUF_CASTS_H__
 #define GOOGLE_PROTOBUF_CASTS_H__
 
+#include <type_traits>
+
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/type_traits.h>
 
 namespace google {
 namespace protobuf {
@@ -95,7 +96,7 @@ inline To down_cast(From* f) {                   // so we only accept pointers
 
 template<typename To, typename From>    // use like this: down_cast<T&>(foo);
 inline To down_cast(From& f) {
-  typedef typename remove_reference<To>::type* ToAsPointer;
+  typedef typename std::remove_reference<To>::type* ToAsPointer;
   // Ensures that To is a sub-type of From *.  This test is here only
   // for compile-time type checking, and has no overhead in an
   // optimized build at run-time, as it will be optimized away
diff --git a/src/google/protobuf/stubs/common.cc b/src/google/protobuf/stubs/common.cc
index 14655916..33d24c57 100644..100755
--- a/src/google/protobuf/stubs/common.cc
+++ b/src/google/protobuf/stubs/common.cc
@@ -30,6 +30,7 @@
 
 // Author: kenton@google.com (Kenton Varda)
 
+#include <google/protobuf/message_lite.h>  // TODO(gerbens) ideally remove this.
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/once.h>
 #include <google/protobuf/stubs/status.h>
@@ -313,86 +314,6 @@ namespace internal { FunctionClosure0::~FunctionClosure0() {} }
 void DoNothing() {}
 
 // ===================================================================
-// emulates google3/base/mutex.cc
-
-#ifdef _WIN32
-
-struct Mutex::Internal {
-  CRITICAL_SECTION mutex;
-#ifndef NDEBUG
-  // Used only to implement AssertHeld().
-  DWORD thread_id;
-#endif
-};
-
-Mutex::Mutex()
-  : mInternal(new Internal) {
-  InitializeCriticalSection(&mInternal->mutex);
-}
-
-Mutex::~Mutex() {
-  DeleteCriticalSection(&mInternal->mutex);
-  delete mInternal;
-}
-
-void Mutex::Lock() {
-  EnterCriticalSection(&mInternal->mutex);
-#ifndef NDEBUG
-  mInternal->thread_id = GetCurrentThreadId();
-#endif
-}
-
-void Mutex::Unlock() {
-#ifndef NDEBUG
-  mInternal->thread_id = 0;
-#endif
-  LeaveCriticalSection(&mInternal->mutex);
-}
-
-void Mutex::AssertHeld() {
-#ifndef NDEBUG
-  GOOGLE_DCHECK_EQ(mInternal->thread_id, GetCurrentThreadId());
-#endif
-}
-
-#elif defined(HAVE_PTHREAD)
-
-struct Mutex::Internal {
-  pthread_mutex_t mutex;
-};
-
-Mutex::Mutex()
-  : mInternal(new Internal) {
-  pthread_mutex_init(&mInternal->mutex, NULL);
-}
-
-Mutex::~Mutex() {
-  pthread_mutex_destroy(&mInternal->mutex);
-  delete mInternal;
-}
-
-void Mutex::Lock() {
-  int result = pthread_mutex_lock(&mInternal->mutex);
-  if (result != 0) {
-    GOOGLE_LOG(FATAL) << "pthread_mutex_lock: " << strerror(result);
-  }
-}
-
-void Mutex::Unlock() {
-  int result = pthread_mutex_unlock(&mInternal->mutex);
-  if (result != 0) {
-    GOOGLE_LOG(FATAL) << "pthread_mutex_unlock: " << strerror(result);
-  }
-}
-
-void Mutex::AssertHeld() {
-  // pthreads dosn't provide a way to check which thread holds the mutex.
-  // TODO(kenton):  Maybe keep track of locking thread ID like with WIN32?
-}
-
-#endif
-
-// ===================================================================
 // emulates google3/util/endian/endian.h
 //
 // TODO(xiaofeng): PROTOBUF_LITTLE_ENDIAN is unfortunately defined in
@@ -416,13 +337,30 @@ uint32 ghtonl(uint32 x) {
 namespace internal {
 
 typedef void OnShutdownFunc();
-vector<void (*)()>* shutdown_functions = NULL;
-Mutex* shutdown_functions_mutex = NULL;
+struct ShutdownData {
+  ~ShutdownData() {
+    for (int i = 0; i < functions.size(); i++) {
+      functions[i]();
+    }
+    for (int i = 0; i < strings.size(); i++) {
+      strings[i]->~string();
+    }
+    for (int i = 0; i < messages.size(); i++) {
+      messages[i]->~MessageLite();
+    }
+  }
+
+  std::vector<void (*)()> functions;
+  std::vector<const std::string*> strings;
+  std::vector<const MessageLite*> messages;
+  Mutex mutex;
+};
+
+ShutdownData* shutdown_data = NULL;
 GOOGLE_PROTOBUF_DECLARE_ONCE(shutdown_functions_init);
 
 void InitShutdownFunctions() {
-  shutdown_functions = new vector<void (*)()>;
-  shutdown_functions_mutex = new Mutex;
+  shutdown_data = new ShutdownData;
 }
 
 inline void InitShutdownFunctionsOnce() {
@@ -431,8 +369,20 @@ inline void InitShutdownFunctionsOnce() {
 
 void OnShutdown(void (*func)()) {
   InitShutdownFunctionsOnce();
-  MutexLock lock(shutdown_functions_mutex);
-  shutdown_functions->push_back(func);
+  MutexLock lock(&shutdown_data->mutex);
+  shutdown_data->functions.push_back(func);
+}
+
+void OnShutdownDestroyString(const std::string* ptr) {
+  InitShutdownFunctionsOnce();
+  MutexLock lock(&shutdown_data->mutex);
+  shutdown_data->strings.push_back(ptr);
+}
+
+void OnShutdownDestroyMessage(const void* ptr) {
+  InitShutdownFunctionsOnce();
+  MutexLock lock(&shutdown_data->mutex);
+  shutdown_data->messages.push_back(static_cast<const MessageLite*>(ptr));
 }
 
 }  // namespace internal
@@ -445,15 +395,10 @@ void ShutdownProtobufLibrary() {
   // called.
 
   // Make it safe to call this multiple times.
-  if (internal::shutdown_functions == NULL) return;
+  if (internal::shutdown_data == NULL) return;
 
-  for (int i = 0; i < internal::shutdown_functions->size(); i++) {
-    internal::shutdown_functions->at(i)();
-  }
-  delete internal::shutdown_functions;
-  internal::shutdown_functions = NULL;
-  delete internal::shutdown_functions_mutex;
-  internal::shutdown_functions_mutex = NULL;
+  delete internal::shutdown_data;
+  internal::shutdown_data = NULL;
 }
 
 #if PROTOBUF_USE_EXCEPTIONS
diff --git a/src/google/protobuf/stubs/common.h b/src/google/protobuf/stubs/common.h
index d2611498..c336383d 100644
--- a/src/google/protobuf/stubs/common.h
+++ b/src/google/protobuf/stubs/common.h
@@ -35,7 +35,13 @@
 #ifndef GOOGLE_PROTOBUF_COMMON_H__
 #define GOOGLE_PROTOBUF_COMMON_H__
 
+#include <algorithm>
+#include <iostream>
+#include <map>
+#include <memory>
+#include <set>
 #include <string>
+#include <vector>
 
 #include <google/protobuf/stubs/port.h>
 #include <google/protobuf/stubs/macros.h>
@@ -43,7 +49,6 @@
 
 // TODO(liujisi): Remove the following includes after the include clean-up.
 #include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/scoped_ptr.h>
 #include <google/protobuf/stubs/mutex.h>
 #include <google/protobuf/stubs/callback.h>
 
@@ -96,27 +101,27 @@ namespace internal {
 
 // The current version, represented as a single integer to make comparison
 // easier:  major * 10^6 + minor * 10^3 + micro
-#define GOOGLE_PROTOBUF_VERSION 3002000
+#define GOOGLE_PROTOBUF_VERSION 3005001
 
 // A suffix string for alpha, beta or rc releases. Empty for stable releases.
 #define GOOGLE_PROTOBUF_VERSION_SUFFIX ""
 
 // The minimum library version which works with the current version of the
 // headers.
-#define GOOGLE_PROTOBUF_MIN_LIBRARY_VERSION 3002000
+#define GOOGLE_PROTOBUF_MIN_LIBRARY_VERSION 3005000
 
 // The minimum header version which works with the current version of
 // the library.  This constant should only be used by protoc's C++ code
 // generator.
-static const int kMinHeaderVersionForLibrary = 3002000;
+static const int kMinHeaderVersionForLibrary = 3005000;
 
 // The minimum protoc version which works with the current version of the
 // headers.
-#define GOOGLE_PROTOBUF_MIN_PROTOC_VERSION 3002000
+#define GOOGLE_PROTOBUF_MIN_PROTOC_VERSION 3005000
 
 // The minimum header version which works with the current version of
 // protoc.  This constant should only be used in VerifyVersion().
-static const int kMinHeaderVersionForProtoc = 3002000;
+static const int kMinHeaderVersionForProtoc = 3005000;
 
 // Verifies that the headers and libraries are compatible.  Use the macro
 // below to call this.
@@ -195,6 +200,10 @@ namespace internal {
 
 // Register a function to be called when ShutdownProtocolBuffers() is called.
 LIBPROTOBUF_EXPORT void OnShutdown(void (*func)());
+// Destroy the string (call string destructor)
+LIBPROTOBUF_EXPORT void OnShutdownDestroyString(const std::string* ptr);
+// Destroy (not delete) the message
+LIBPROTOBUF_EXPORT void OnShutdownDestroyMessage(const void* ptr);
 
 }  // namespace internal
 
@@ -220,7 +229,7 @@ class FatalException : public std::exception {
 
 // This is at the end of the file instead of the beginning to work around a bug
 // in some versions of MSVC.
-using namespace std;  // Don't do this at home, kids.
+using std::string;
 
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/stubs/common_unittest.cc b/src/google/protobuf/stubs/common_unittest.cc
index f9e2cfd4..798a2a27 100644
--- a/src/google/protobuf/stubs/common_unittest.cc
+++ b/src/google/protobuf/stubs/common_unittest.cc
@@ -75,7 +75,7 @@ TEST(CommonTest, IntMinMaxConstants) {
   EXPECT_EQ(0, kuint64max + 1);
 }
 
-vector<string> captured_messages_;
+std::vector<string> captured_messages_;
 
 void CaptureLog(LogLevel level, const char* filename, int line,
                 const string& message) {
diff --git a/src/google/protobuf/stubs/fastmem.h b/src/google/protobuf/stubs/fastmem.h
index 763a6e60..1f1f6ed3 100644
--- a/src/google/protobuf/stubs/fastmem.h
+++ b/src/google/protobuf/stubs/fastmem.h
@@ -111,7 +111,8 @@ inline int fastmemcmp_inlined(const char *a, const char *b, size_t n) {
     b += sizeof(uint32);
   }
   while (a < a_limit) {
-    int d = static_cast<uint32>(*a++) - static_cast<uint32>(*b++);
+    int d =
+        static_cast<int>(static_cast<uint32>(*a++) - static_cast<uint32>(*b++));
     if (d) return d;
   }
   return 0;
diff --git a/src/google/protobuf/stubs/hash.h b/src/google/protobuf/stubs/hash.h
index be998b29..fd8ba156 100644
--- a/src/google/protobuf/stubs/hash.h
+++ b/src/google/protobuf/stubs/hash.h
@@ -40,10 +40,9 @@
 
 #define GOOGLE_PROTOBUF_HAVE_HASH_MAP 1
 #define GOOGLE_PROTOBUF_HAVE_HASH_SET 1
-#define GOOGLE_PROTOBUF_HAVE_64BIT_HASH 1
 
 // Use C++11 unordered_{map|set} if available.
-#if ((_LIBCPP_STD_VER >= 11) || \
+#if ((defined(_LIBCPP_STD_VER) && _LIBCPP_STD_VER >= 11) || \
     (((__cplusplus >= 201103L) || defined(__GXX_EXPERIMENTAL_CXX0X)) && \
     (__GLIBCXX__ > 20090421)))
 # define GOOGLE_PROTOBUF_HAS_CXX11_HASH
@@ -93,8 +92,11 @@
 #  define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
 # endif
 
-# if __GNUC__ == 4 && __GNUC__MINOR__ <= 1
-#  undef GOOGLE_PROTOBUF_HAVE_64BIT_HASH
+// GCC <= 4.1 does not define std::tr1::hash for `long long int` or `long long unsigned int`
+# if __GNUC__ == 4 && defined(__GNUC_MINOR__) && __GNUC_MINOR__ <= 1
+#  undef GOOGLE_PROTOBUF_HAS_TR1
+#  undef GOOGLE_PROTOBUF_HAVE_HASH_MAP
+#  undef GOOGLE_PROTOBUF_HAVE_HASH_SET
 # endif
 
 // Version checks for MSC.
@@ -233,7 +235,8 @@ class hash_set : public std::set<Key, HashFcn> {
   HashFcn hash_function() const { return HashFcn(); }
 };
 
-#elif defined(_MSC_VER) && !defined(_STLPORT_VERSION)
+#elif defined(_MSC_VER) && !defined(_STLPORT_VERSION) && \
+    !(defined(_LIBCPP_STD_VER) && _LIBCPP_STD_VER >= 11)
 
 template <typename Key>
 struct hash : public GOOGLE_PROTOBUF_HASH_COMPARE<Key> {
@@ -348,7 +351,7 @@ struct hash<const char*> {
   inline size_t operator()(const char* str) const {
     size_t result = 0;
     for (; *str != '\0'; str++) {
-      result = 5 * result + *str;
+      result = 5 * result + static_cast<size_t>(*str);
     }
     return result;
   }
@@ -406,8 +409,8 @@ struct hash<string> {
 };
 
 template <typename First, typename Second>
-struct hash<pair<First, Second> > {
-  inline size_t operator()(const pair<First, Second>& key) const {
+struct hash<std::pair<First, Second> > {
+  inline size_t operator()(const std::pair<First, Second>& key) const {
     size_t first_hash = hash<First>()(key.first);
     size_t second_hash = hash<Second>()(key.second);
 
@@ -418,8 +421,8 @@ struct hash<pair<First, Second> > {
 
   static const size_t bucket_size = 4;
   static const size_t min_buckets = 8;
-  inline bool operator()(const pair<First, Second>& a,
-                           const pair<First, Second>& b) const {
+  inline bool operator()(const std::pair<First, Second>& a,
+                           const std::pair<First, Second>& b) const {
     return a < b;
   }
 };
diff --git a/src/google/protobuf/stubs/int128.cc b/src/google/protobuf/stubs/int128.cc
index a5090801..7b993e8f 100644
--- a/src/google/protobuf/stubs/int128.cc
+++ b/src/google/protobuf/stubs/int128.cc
@@ -76,52 +76,36 @@ static inline int Fls128(uint128 n) {
   return Fls64(Uint128Low64(n));
 }
 
-// Long division/modulo for uint128 implemented using the shift-subtract
-// division algorithm adapted from:
-// http://stackoverflow.com/questions/5386377/division-without-using
 void uint128::DivModImpl(uint128 dividend, uint128 divisor,
                          uint128* quotient_ret, uint128* remainder_ret) {
   if (divisor == 0) {
     GOOGLE_LOG(FATAL) << "Division or mod by zero: dividend.hi=" << dividend.hi_
                       << ", lo=" << dividend.lo_;
-  }
-
-  if (divisor > dividend) {
+  } else if (dividend < divisor) {
     *quotient_ret = 0;
     *remainder_ret = dividend;
     return;
-  }
-
-  if (divisor == dividend) {
-    *quotient_ret = 1;
-    *remainder_ret = 0;
-    return;
-  }
-
-  uint128 denominator = divisor;
-  uint128 position = 1;
-  uint128 quotient = 0;
-
-  // Left aligns the MSB of the denominator and the dividend.
-  int shift = Fls128(dividend) - Fls128(denominator);
-  denominator <<= shift;
-  position <<= shift;
-
-  // Uses shift-subtract algorithm to divide dividend by denominator. The
-  // remainder will be left in dividend.
-  while (position > 0) {
-    if (dividend >= denominator) {
-      dividend -= denominator;
-      quotient |= position;
+  } else {
+    int dividend_bit_length = Fls128(dividend);
+    int divisor_bit_length = Fls128(divisor);
+    int difference = dividend_bit_length - divisor_bit_length;
+    uint128 quotient = 0;
+    while (difference >= 0) {
+      quotient <<= 1;
+      uint128 shifted_divisor = divisor << difference;
+      if (shifted_divisor <= dividend) {
+        dividend -= shifted_divisor;
+        quotient += 1;
+      }
+      difference -= 1;
     }
-    position >>= 1;
-    denominator >>= 1;
+    //record the final quotient and remainder
+    *quotient_ret = quotient;
+    *remainder_ret = dividend;
   }
-
-  *quotient_ret = quotient;
-  *remainder_ret = dividend;
 }
 
+
 uint128& uint128::operator/=(const uint128& divisor) {
   uint128 quotient = 0;
   uint128 remainder = 0;
diff --git a/src/google/protobuf/stubs/int128_unittest.cc b/src/google/protobuf/stubs/int128_unittest.cc
index 5d33292c..1ec899ad 100644
--- a/src/google/protobuf/stubs/int128_unittest.cc
+++ b/src/google/protobuf/stubs/int128_unittest.cc
@@ -370,29 +370,29 @@ TEST(Int128, DivideAndMod) {
   EXPECT_EQ(r, result_r);
 
   // Try the other way around.
-  swap(q, b);
+  std::swap(q, b);
   result_q = a / b;
   result_r = a % b;
   EXPECT_EQ(q, result_q);
   EXPECT_EQ(r, result_r);
   // Restore.
-  swap(b, q);
+  std::swap(b, q);
 
   // Dividend < divisor; result should be q:0 r:<dividend>.
-  swap(a, b);
+  std::swap(a, b);
   result_q = a / b;
   result_r = a % b;
   EXPECT_EQ(0, result_q);
   EXPECT_EQ(a, result_r);
   // Try the other way around.
-  swap(a, q);
+  std::swap(a, q);
   result_q = a / b;
   result_r = a % b;
   EXPECT_EQ(0, result_q);
   EXPECT_EQ(a, result_r);
   // Restore.
-  swap(q, a);
-  swap(b, a);
+  std::swap(q, a);
+  std::swap(b, a);
 
   // Try a large remainder.
   b = a / 2 + 1;
@@ -501,7 +501,7 @@ TEST(Int128, OStream) {
         {uint128(12345), std::ios::dec | std::ios::left, 6, '_', "12345_"},
   };
   for (size_t i = 0; i < GOOGLE_ARRAYSIZE(cases); ++i) {
-    ostringstream os;
+    std::ostringstream os;
     os.flags(cases[i].flags);
     os.width(cases[i].width);
     os.fill(cases[i].fill);
diff --git a/src/google/protobuf/stubs/io_win32.cc b/src/google/protobuf/stubs/io_win32.cc
new file mode 100644
index 00000000..4407facb
--- /dev/null
+++ b/src/google/protobuf/stubs/io_win32.cc
@@ -0,0 +1,414 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: laszlocsomor@google.com (Laszlo Csomor)
+//
+// Implementation for long-path-aware open/mkdir/access/etc. on Windows, as well
+// as for the supporting utility functions.
+//
+// These functions convert the input path to an absolute Windows path
+// with "\\?\" prefix, then pass that to _wopen/_wmkdir/_waccess/etc.
+// (declared in <io.h>) respectively. This allows working with files/directories
+// whose paths are longer than MAX_PATH (260 chars).
+//
+// This file is only used on Windows, it's empty on other platforms.
+
+#if defined(_WIN32)
+
+// Comment this out to fall back to using the ANSI versions (open, mkdir, ...)
+// instead of the Unicode ones (_wopen, _wmkdir, ...). Doing so can be useful to
+// debug failing tests if that's caused by the long path support.
+#define SUPPORT_LONGPATHS
+
+#include <ctype.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <io.h>
+#include <memory>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <wctype.h>
+#include <windows.h>
+
+#include <google/protobuf/stubs/io_win32.h>
+
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+namespace win32 {
+namespace {
+
+using std::string;
+using std::wstring;
+
+template <typename char_type>
+struct CharTraits {
+  static bool is_alpha(char_type ch);
+};
+
+template <>
+struct CharTraits<char> {
+  static bool is_alpha(char ch) { return isalpha(ch); }
+};
+
+template <>
+struct CharTraits<wchar_t> {
+  static bool is_alpha(wchar_t ch) { return iswalpha(ch); }
+};
+
+template <typename char_type>
+bool null_or_empty(const char_type* s) {
+  return s == NULL || *s == 0;
+}
+
+// Returns true if the path starts with a drive letter, e.g. "c:".
+// Note that this won't check for the "\" after the drive letter, so this also
+// returns true for "c:foo" (which is "c:\${PWD}\foo").
+// This check requires that a path not have a longpath prefix ("\\?\").
+template <typename char_type>
+bool has_drive_letter(const char_type* ch) {
+  return CharTraits<char_type>::is_alpha(ch[0]) && ch[1] == ':';
+}
+
+// Returns true if the path starts with a longpath prefix ("\\?\").
+template <typename char_type>
+bool has_longpath_prefix(const char_type* path) {
+  return path[0] == '\\' && path[1] == '\\' && path[2] == '?' &&
+         path[3] == '\\';
+}
+
+template <typename char_type>
+bool is_separator(char_type c) {
+  return c == '/' || c == '\\';
+}
+
+// Returns true if the path starts with a drive specifier (e.g. "c:\").
+template <typename char_type>
+bool is_path_absolute(const char_type* path) {
+  return has_drive_letter(path) && is_separator(path[2]);
+}
+
+template <typename char_type>
+bool is_drive_relative(const char_type* path) {
+  return has_drive_letter(path) && (path[2] == 0 || !is_separator(path[2]));
+}
+
+wstring join_paths(const wstring& path1, const wstring& path2) {
+  if (path1.empty() || is_path_absolute(path2.c_str()) ||
+      has_longpath_prefix(path2.c_str())) {
+    return path2;
+  }
+  if (path2.empty()) {
+    return path1;
+  }
+
+  if (is_separator(path1[path1.size() - 1])) {
+    return is_separator(path2[0]) ? (path1 + path2.substr(1))
+                                       : (path1 + path2);
+  } else {
+    return is_separator(path2[0]) ? (path1 + path2)
+                                       : (path1 + L'\\' + path2);
+  }
+}
+
+wstring normalize(wstring path) {
+  if (has_longpath_prefix(path.c_str())) {
+    path = path.substr(4);
+  }
+
+  static const wstring dot(L".");
+  static const wstring dotdot(L"..");
+  const WCHAR* p = path.c_str();
+
+  std::vector<wstring> segments;
+  int segment_start = -1;
+  // Find the path segments in `path` (separated by "/").
+  for (int i = 0;; ++i) {
+    if (!is_separator(p[i]) && p[i] != L'\0') {
+      // The current character does not end a segment, so start one unless it's
+      // already started.
+      if (segment_start < 0) {
+        segment_start = i;
+      }
+    } else if (segment_start >= 0 && i > segment_start) {
+      // The current character is "/" or "\0", so this ends a segment.
+      // Add that to `segments` if there's anything to add; handle "." and "..".
+      wstring segment(p, segment_start, i - segment_start);
+      segment_start = -1;
+      if (segment == dotdot) {
+        if (!segments.empty() &&
+            (!has_drive_letter(segments[0].c_str()) || segments.size() > 1)) {
+          segments.pop_back();
+        }
+      } else if (segment != dot && !segment.empty()) {
+        segments.push_back(segment);
+      }
+    }
+    if (p[i] == L'\0') {
+      break;
+    }
+  }
+
+  // Handle the case when `path` is just a drive specifier (or some degenerate
+  // form of it, e.g. "c:\..").
+  if (segments.size() == 1 && segments[0].size() == 2 &&
+      has_drive_letter(segments[0].c_str())) {
+    return segments[0] + L'\\';
+  }
+
+  // Join all segments.
+  bool first = true;
+  std::wstringstream result;
+  for (int i = 0; i < segments.size(); ++i) {
+    if (!first) {
+      result << L'\\';
+    }
+    first = false;
+    result << segments[i];
+  }
+  // Preserve trailing separator if the input contained it.
+  if (!path.empty() && is_separator(p[path.size() - 1])) {
+    result << L'\\';
+  }
+  return result.str();
+}
+
+bool as_windows_path(const char* path, wstring* result) {
+  if (null_or_empty(path)) {
+    result->clear();
+    return true;
+  }
+  wstring wpath;
+  if (!strings::utf8_to_wcs(path, &wpath)) {
+    return false;
+  }
+  if (has_longpath_prefix(wpath.c_str())) {
+    *result = wpath;
+    return true;
+  }
+  if (is_separator(path[0]) || is_drive_relative(path)) {
+    return false;
+  }
+
+
+  if (!is_path_absolute(wpath.c_str())) {
+    int size = ::GetCurrentDirectoryW(0, NULL);
+    if (size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+      return false;
+    }
+    std::unique_ptr<WCHAR[]> wcwd(new WCHAR[size]);
+    ::GetCurrentDirectoryW(size, wcwd.get());
+    wpath = join_paths(wcwd.get(), wpath);
+  }
+  wpath = normalize(wpath);
+  if (!has_longpath_prefix(wpath.c_str())) {
+    // Add the "\\?\" prefix unconditionally. This way we prevent the Win32 API
+    // from processing the path and "helpfully" removing trailing dots from the
+    // path, for example.
+    // See https://github.com/bazelbuild/bazel/issues/2935
+    wpath = wstring(L"\\\\?\\") + wpath;
+  }
+  *result = wpath;
+  return true;
+}
+
+}  // namespace
+
+int open(const char* path, int flags, int mode) {
+#ifdef SUPPORT_LONGPATHS
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wopen(wpath.c_str(), flags, mode);
+#else
+  return ::_open(path, flags, mode);
+#endif
+}
+
+int mkdir(const char* path, int _mode) {
+#ifdef SUPPORT_LONGPATHS
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wmkdir(wpath.c_str());
+#else   // not SUPPORT_LONGPATHS
+  return ::_mkdir(path);
+#endif  // not SUPPORT_LONGPATHS
+}
+
+int access(const char* path, int mode) {
+#ifdef SUPPORT_LONGPATHS
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_waccess(wpath.c_str(), mode);
+#else
+  return ::_access(path, mode);
+#endif
+}
+
+int chdir(const char* path) {
+#ifdef SUPPORT_LONGPATHS
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wchdir(wpath.c_str());
+#else
+  return ::_chdir(path);
+#endif
+}
+
+int stat(const char* path, struct _stat* buffer) {
+#ifdef SUPPORT_LONGPATHS
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return -1;
+  }
+  return ::_wstat(wpath.c_str(), buffer);
+#else   // not SUPPORT_LONGPATHS
+  return ::_stat(path, buffer);
+#endif  // not SUPPORT_LONGPATHS
+}
+
+FILE* fopen(const char* path, const char* mode) {
+#ifdef SUPPORT_LONGPATHS
+  if (null_or_empty(path)) {
+    errno = EINVAL;
+    return NULL;
+  }
+  wstring wpath;
+  if (!as_windows_path(path, &wpath)) {
+    errno = ENOENT;
+    return NULL;
+  }
+  wstring wmode;
+  if (!strings::utf8_to_wcs(mode, &wmode)) {
+    errno = EINVAL;
+    return NULL;
+  }
+  return ::_wfopen(wpath.c_str(), wmode.c_str());
+#else
+  return ::fopen(path, mode);
+#endif
+}
+
+int close(int fd) { return ::close(fd); }
+
+int dup(int fd) { return ::_dup(fd); }
+
+int dup2(int fd1, int fd2) { return ::_dup2(fd1, fd2); }
+
+int read(int fd, void* buffer, size_t size) {
+  return ::_read(fd, buffer, size);
+}
+
+int setmode(int fd, int mode) { return ::_setmode(fd, mode); }
+
+int write(int fd, const void* buffer, size_t size) {
+  return ::_write(fd, buffer, size);
+}
+
+wstring testonly_utf8_to_winpath(const char* path) {
+  wstring wpath;
+  return as_windows_path(path, &wpath) ? wpath : wstring();
+}
+
+namespace strings {
+
+bool wcs_to_mbs(const WCHAR* s, string* out, bool outUtf8) {
+  if (null_or_empty(s)) {
+    out->clear();
+    return true;
+  }
+  BOOL usedDefaultChar = FALSE;
+  SetLastError(0);
+  int size = WideCharToMultiByte(
+      outUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, NULL, 0, NULL,
+      outUtf8 ? NULL : &usedDefaultChar);
+  if ((size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+      || usedDefaultChar) {
+    return false;
+  }
+  std::unique_ptr<CHAR[]> astr(new CHAR[size]);
+  WideCharToMultiByte(
+      outUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, astr.get(), size, NULL, NULL);
+  out->assign(astr.get());
+  return true;
+}
+
+bool mbs_to_wcs(const char* s, wstring* out, bool inUtf8) {
+  if (null_or_empty(s)) {
+    out->clear();
+    return true;
+  }
+
+  SetLastError(0);
+  int size =
+      MultiByteToWideChar(inUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, NULL, 0);
+  if (size == 0 && GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+    return false;
+  }
+  std::unique_ptr<WCHAR[]> wstr(new WCHAR[size]);
+  MultiByteToWideChar(
+      inUtf8 ? CP_UTF8 : CP_ACP, 0, s, -1, wstr.get(), size + 1);
+  out->assign(wstr.get());
+  return true;
+}
+
+bool utf8_to_wcs(const char* input, wstring* out) {
+  return mbs_to_wcs(input, out, true);
+}
+
+bool wcs_to_utf8(const wchar_t* input, string* out) {
+  return wcs_to_mbs(input, out, true);
+}
+
+}  // namespace strings
+}  // namespace win32
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // defined(_WIN32)
diff --git a/src/google/protobuf/stubs/io_win32.h b/src/google/protobuf/stubs/io_win32.h
new file mode 100644
index 00000000..9e17d253
--- /dev/null
+++ b/src/google/protobuf/stubs/io_win32.h
@@ -0,0 +1,115 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: laszlocsomor@google.com (Laszlo Csomor)
+//
+// This file contains the declarations for Windows implementations of
+// commonly used POSIX functions such as open(2) and access(2), as well
+// as macro definitions for flags of these functions.
+//
+// By including this file you'll redefine open/access/etc. to
+// ::google::protobuf::internal::win32::{open/access/etc.}.
+// Make sure you don't include a header that attempts to redeclare or
+// redefine these functions, that'll lead to confusing compilation
+// errors. It's best to #include this file as the last one to ensure that.
+//
+// This file is only used on Windows, it's empty on other platforms.
+
+#ifndef GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
+#define GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
+
+#if defined(_WIN32)
+
+#include <string>
+#include <google/protobuf/stubs/port.h>
+
+// Compilers on Windows other than MSVC (e.g. Cygwin, MinGW32) define the
+// following functions already, except for mkdir.
+namespace google {
+namespace protobuf {
+namespace internal {
+namespace win32 {
+
+LIBPROTOBUF_EXPORT FILE* fopen(const char* path, const char* mode);
+LIBPROTOBUF_EXPORT int access(const char* path, int mode);
+LIBPROTOBUF_EXPORT int chdir(const char* path);
+LIBPROTOBUF_EXPORT int close(int fd);
+LIBPROTOBUF_EXPORT int dup(int fd);
+LIBPROTOBUF_EXPORT int dup2(int fd1, int fd2);
+LIBPROTOBUF_EXPORT int mkdir(const char* path, int _mode);
+LIBPROTOBUF_EXPORT int open(const char* path, int flags, int mode = 0);
+LIBPROTOBUF_EXPORT int read(int fd, void* buffer, size_t size);
+LIBPROTOBUF_EXPORT int setmode(int fd, int mode);
+LIBPROTOBUF_EXPORT int stat(const char* path, struct _stat* buffer);
+LIBPROTOBUF_EXPORT int write(int fd, const void* buffer, size_t size);
+LIBPROTOBUF_EXPORT std::wstring testonly_utf8_to_winpath(const char* path);
+
+namespace strings {
+
+// Convert from UTF-16 to Active-Code-Page-encoded or to UTF-8-encoded text.
+LIBPROTOBUF_EXPORT bool wcs_to_mbs(
+    const wchar_t* s, std::string* out, bool outUtf8);
+
+// Convert from Active-Code-Page-encoded or UTF-8-encoded text to UTF-16.
+LIBPROTOBUF_EXPORT bool mbs_to_wcs(
+    const char* s, std::wstring* out, bool inUtf8);
+
+// Convert from UTF-8-encoded text to UTF-16.
+LIBPROTOBUF_EXPORT bool utf8_to_wcs(const char* input, std::wstring* out);
+
+// Convert from UTF-16-encoded text to UTF-8.
+LIBPROTOBUF_EXPORT bool wcs_to_utf8(const wchar_t* input, std::string* out);
+
+}  // namespace strings
+
+}  // namespace win32
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
+
+#ifndef W_OK
+#define W_OK 02  // not defined by MSVC for whatever reason
+#endif
+
+#ifndef F_OK
+#define F_OK 00  // not defined by MSVC for whatever reason
+#endif
+
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+
+#ifndef STDOUT_FILENO
+#define STDOUT_FILENO 1
+#endif
+
+#endif  // defined(_WIN32)
+
+#endif  // GOOGLE_PROTOBUF_STUBS_IO_WIN32_H__
diff --git a/src/google/protobuf/stubs/io_win32_unittest.cc b/src/google/protobuf/stubs/io_win32_unittest.cc
new file mode 100644
index 00000000..c933757c
--- /dev/null
+++ b/src/google/protobuf/stubs/io_win32_unittest.cc
@@ -0,0 +1,452 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: laszlocsomor@google.com (Laszlo Csomor)
+//
+// Unit tests for long-path-aware open/mkdir/access/etc. on Windows, as well as
+// for the supporting utility functions.
+//
+// This file is only used on Windows, it's empty on other platforms.
+
+#if defined(_WIN32)
+
+#define WIN32_LEAN_AND_MEAN
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <wchar.h>
+#include <windows.h>
+
+#include <google/protobuf/stubs/io_win32.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+#include <sstream>
+#include <string>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+namespace win32 {
+namespace {
+
+const char kUtf8Text[] = {
+    'h', 'i', ' ',
+    // utf-8: 11010000 10011111, utf-16: 100 0001 1111 = 0x041F
+    0xd0, 0x9f,
+    // utf-8: 11010001 10000000, utf-16: 100 0100 0000 = 0x0440
+    0xd1, 0x80,
+    // utf-8: 11010000 10111000, utf-16: 100 0011 1000 = 0x0438
+    0xd0, 0xb8,
+    // utf-8: 11010000 10110010, utf-16: 100 0011 0010 = 0x0432
+    0xd0, 0xb2,
+    // utf-8: 11010000 10110101, utf-16: 100 0011 0101 = 0x0435
+    0xd0, 0xb5,
+    // utf-8: 11010001 10000010, utf-16: 100 0100 0010 = 0x0442
+    0xd1, 0x82, 0
+};
+
+const wchar_t kUtf16Text[] = {
+  L'h', L'i', L' ',
+  L'\x41f', L'\x440', L'\x438', L'\x432', L'\x435', L'\x442', 0
+};
+
+using std::string;
+using std::wstring;
+
+class IoWin32Test : public ::testing::Test {
+ public:
+  void SetUp();
+  void TearDown();
+
+ protected:
+  bool CreateAllUnder(wstring path);
+  bool DeleteAllUnder(wstring path);
+
+  WCHAR working_directory[MAX_PATH];
+  string test_tmpdir;
+  wstring wtest_tmpdir;
+};
+
+#define ASSERT_INITIALIZED              \
+  {                                     \
+    EXPECT_FALSE(test_tmpdir.empty());  \
+    EXPECT_FALSE(wtest_tmpdir.empty()); \
+  }
+
+namespace {
+void StripTrailingSlashes(string* str) {
+  int i = str->size() - 1;
+  for (; i >= 0 && ((*str)[i] == '/' || (*str)[i] == '\\'); --i) {}
+  str->resize(i+1);
+}
+
+bool GetEnvVarAsUtf8(const WCHAR* name, string* result) {
+  DWORD size = ::GetEnvironmentVariableW(name, NULL, 0);
+  if (size > 0 && GetLastError() != ERROR_ENVVAR_NOT_FOUND) {
+    std::unique_ptr<WCHAR[]> wcs(new WCHAR[size]);
+    ::GetEnvironmentVariableW(name, wcs.get(), size);
+    // GetEnvironmentVariableA retrieves an Active-Code-Page-encoded text which
+    // we'd first need to convert to UTF-16 then to UTF-8, because there seems
+    // to be no API function to do that conversion directly.
+    // GetEnvironmentVariableW retrieves an UTF-16-encoded text, which we need
+    // to convert to UTF-8.
+    return strings::wcs_to_utf8(wcs.get(), result);
+  } else {
+    return false;
+  }
+}
+
+bool GetCwdAsUtf8(string* result) {
+  DWORD size = ::GetCurrentDirectoryW(0, NULL);
+  if (size > 0) {
+    std::unique_ptr<WCHAR[]> wcs(new WCHAR[size]);
+    ::GetCurrentDirectoryW(size, wcs.get());
+    // GetCurrentDirectoryA retrieves an Active-Code-Page-encoded text which
+    // we'd first need to convert to UTF-16 then to UTF-8, because there seems
+    // to be no API function to do that conversion directly.
+    // GetCurrentDirectoryW retrieves an UTF-16-encoded text, which we need
+    // to convert to UTF-8.
+    return strings::wcs_to_utf8(wcs.get(), result);
+  } else {
+    return false;
+  }
+}
+
+}  // namespace
+
+void IoWin32Test::SetUp() {
+  test_tmpdir.clear();
+  wtest_tmpdir.clear();
+  EXPECT_GT(::GetCurrentDirectoryW(MAX_PATH, working_directory), 0);
+
+  string tmp;
+  bool ok = false;
+  if (!ok) {
+    // Bazel sets this environment variable when it runs tests.
+    ok = GetEnvVarAsUtf8(L"TEST_TMPDIR", &tmp);
+  }
+  if (!ok) {
+    // Bazel 0.8.0 sets this environment for every build and test action.
+    ok = GetEnvVarAsUtf8(L"TEMP", &tmp);
+  }
+  if (!ok) {
+    // Bazel 0.8.0 sets this environment for every build and test action.
+    ok = GetEnvVarAsUtf8(L"TMP", &tmp);
+  }
+  if (!ok) {
+    // Fall back to using the current directory.
+    ok = GetCwdAsUtf8(&tmp);
+  }
+  if (!ok || tmp.empty()) {
+    FAIL() << "Cannot find a temp directory.";
+  }
+
+  StripTrailingSlashes(&tmp);
+  std::stringstream result;
+  // Deleting files and directories is asynchronous on Windows, and if TearDown
+  // just deleted the previous temp directory, sometimes we cannot recreate the
+  // same directory.
+  // Use a counter so every test method gets its own temp directory.
+  static unsigned int counter = 0;
+  result << tmp << "\\w32tst" << counter++ << ".tmp";
+  test_tmpdir = result.str();
+  wtest_tmpdir = testonly_utf8_to_winpath(test_tmpdir.c_str());
+  ASSERT_FALSE(wtest_tmpdir.empty());
+  ASSERT_TRUE(DeleteAllUnder(wtest_tmpdir));
+  ASSERT_TRUE(CreateAllUnder(wtest_tmpdir));
+}
+
+void IoWin32Test::TearDown() {
+  if (!wtest_tmpdir.empty()) {
+    DeleteAllUnder(wtest_tmpdir);
+  }
+  ::SetCurrentDirectoryW(working_directory);
+}
+
+bool IoWin32Test::CreateAllUnder(wstring path) {
+  // Prepend UNC prefix if the path doesn't have it already. Don't bother
+  // checking if the path is shorter than MAX_PATH, let's just do it
+  // unconditionally.
+  if (path.find(L"\\\\?\\") != 0) {
+    path = wstring(L"\\\\?\\") + path;
+  }
+  if (::CreateDirectoryW(path.c_str(), NULL) ||
+      GetLastError() == ERROR_ALREADY_EXISTS ||
+      GetLastError() == ERROR_ACCESS_DENIED) {
+    return true;
+  }
+  if (GetLastError() == ERROR_PATH_NOT_FOUND) {
+    size_t pos = path.find_last_of(L'\\');
+    if (pos != wstring::npos) {
+      wstring parent(path, 0, pos);
+      if (CreateAllUnder(parent) && CreateDirectoryW(path.c_str(), NULL)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+bool IoWin32Test::DeleteAllUnder(wstring path) {
+  static const wstring kDot(L".");
+  static const wstring kDotDot(L"..");
+
+  // Prepend UNC prefix if the path doesn't have it already. Don't bother
+  // checking if the path is shorter than MAX_PATH, let's just do it
+  // unconditionally.
+  if (path.find(L"\\\\?\\") != 0) {
+    path = wstring(L"\\\\?\\") + path;
+  }
+  // Append "\" if necessary.
+  if (path[path.size() - 1] != L'\\') {
+    path.push_back(L'\\');
+  }
+
+  WIN32_FIND_DATAW metadata;
+  HANDLE handle = ::FindFirstFileW((path + L"*").c_str(), &metadata);
+  if (handle == INVALID_HANDLE_VALUE) {
+    return true;  // directory doesn't exist
+  }
+
+  bool result = true;
+  do {
+    wstring childname = metadata.cFileName;
+    if (kDot != childname && kDotDot != childname) {
+      wstring childpath = path + childname;
+      if ((metadata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+        // If this is not a junction, delete its contents recursively.
+        // Finally delete this directory/junction too.
+        if (((metadata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) == 0 &&
+             !DeleteAllUnder(childpath)) ||
+            !::RemoveDirectoryW(childpath.c_str())) {
+          result = false;
+          break;
+        }
+      } else {
+        if (!::DeleteFileW(childpath.c_str())) {
+          result = false;
+          break;
+        }
+      }
+    }
+  } while (::FindNextFileW(handle, &metadata));
+  ::FindClose(handle);
+  return result;
+}
+
+TEST_F(IoWin32Test, AccessTest) {
+  ASSERT_INITIALIZED;
+
+  string path = test_tmpdir;
+  while (path.size() < MAX_PATH - 30) {
+    path += "\\accesstest";
+    EXPECT_EQ(mkdir(path.c_str(), 0644), 0);
+  }
+  string file = path + "\\file.txt";
+  int fd = open(file.c_str(), O_CREAT | O_WRONLY, 0644);
+  if (fd > 0) {
+    EXPECT_EQ(close(fd), 0);
+  } else {
+    EXPECT_TRUE(false);
+  }
+
+  EXPECT_EQ(access(test_tmpdir.c_str(), F_OK), 0);
+  EXPECT_EQ(access(path.c_str(), F_OK), 0);
+  EXPECT_EQ(access(path.c_str(), W_OK), 0);
+  EXPECT_EQ(access(file.c_str(), F_OK | W_OK), 0);
+  EXPECT_NE(access((file + ".blah").c_str(), F_OK), 0);
+  EXPECT_NE(access((file + ".blah").c_str(), W_OK), 0);
+
+  EXPECT_EQ(access(".", F_OK), 0);
+  EXPECT_EQ(access(".", W_OK), 0);
+  EXPECT_EQ(access((test_tmpdir + "/accesstest").c_str(), F_OK | W_OK), 0);
+  ASSERT_EQ(access((test_tmpdir + "/./normalize_me/.././accesstest").c_str(),
+                   F_OK | W_OK),
+            0);
+  EXPECT_NE(access("io_win32_unittest.AccessTest.nonexistent", F_OK), 0);
+  EXPECT_NE(access("io_win32_unittest.AccessTest.nonexistent", W_OK), 0);
+
+  ASSERT_EQ(access("c:bad", F_OK), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(access("/tmp/bad", F_OK), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(access("\\bad", F_OK), -1);
+  ASSERT_EQ(errno, ENOENT);
+}
+
+TEST_F(IoWin32Test, OpenTest) {
+  ASSERT_INITIALIZED;
+
+  string path = test_tmpdir;
+  while (path.size() < MAX_PATH) {
+    path += "\\opentest";
+    EXPECT_EQ(mkdir(path.c_str(), 0644), 0);
+  }
+  string file = path + "\\file.txt";
+  int fd = open(file.c_str(), O_CREAT | O_WRONLY, 0644);
+  if (fd > 0) {
+    EXPECT_EQ(write(fd, "hello", 5), 5);
+    EXPECT_EQ(close(fd), 0);
+  } else {
+    EXPECT_TRUE(false);
+  }
+
+  ASSERT_EQ(open("c:bad.txt", O_CREAT | O_WRONLY, 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(open("/tmp/bad.txt", O_CREAT | O_WRONLY, 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(open("\\bad.txt", O_CREAT | O_WRONLY, 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+}
+
+TEST_F(IoWin32Test, MkdirTest) {
+  ASSERT_INITIALIZED;
+
+  string path = test_tmpdir;
+  do {
+    path += "\\mkdirtest";
+    ASSERT_EQ(mkdir(path.c_str(), 0644), 0);
+  } while (path.size() <= MAX_PATH);
+
+  ASSERT_EQ(mkdir("c:bad", 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(mkdir("/tmp/bad", 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+  ASSERT_EQ(mkdir("\\bad", 0644), -1);
+  ASSERT_EQ(errno, ENOENT);
+}
+
+TEST_F(IoWin32Test, MkdirTestNonAscii) {
+  ASSERT_INITIALIZED;
+
+  // Create a non-ASCII path.
+  // Ensure that we can create the directory using SetCurrentDirectoryW.
+  EXPECT_TRUE(CreateDirectoryW((wtest_tmpdir + L"\\1").c_str(), NULL));
+  EXPECT_TRUE(CreateDirectoryW((wtest_tmpdir + L"\\1\\" + kUtf16Text).c_str(), NULL));
+  // Ensure that we can create a very similarly named directory using mkdir.
+  // We don't attemp to delete and recreate the same directory, because on
+  // Windows, deleting files and directories seems to be asynchronous.
+  EXPECT_EQ(mkdir((test_tmpdir + "\\2").c_str(), 0644), 0);
+  EXPECT_EQ(mkdir((test_tmpdir + "\\2\\" + kUtf8Text).c_str(), 0644), 0);
+}
+
+TEST_F(IoWin32Test, ChdirTest) {
+  string path("C:\\");
+  EXPECT_EQ(access(path.c_str(), F_OK), 0);
+  ASSERT_EQ(chdir(path.c_str()), 0);
+
+  // Do not try to chdir into the test_tmpdir, it may already contain directory
+  // names with trailing dots.
+  // Instead test here with an obviously dot-trailed path. If the win32_chdir
+  // function would not convert the path to absolute and prefix with "\\?\" then
+  // the Win32 API would ignore the trailing dot, but because of the prefixing
+  // there'll be no path processing done, so we'll actually attempt to chdir
+  // into "C:\some\path\foo."
+  path = test_tmpdir + "/foo.";
+  EXPECT_EQ(mkdir(path.c_str(), 644), 0);
+  EXPECT_EQ(access(path.c_str(), F_OK), 0);
+  ASSERT_NE(chdir(path.c_str()), 0);
+}
+
+TEST_F(IoWin32Test, ChdirTestNonAscii) {
+  ASSERT_INITIALIZED;
+
+  // Create a directory with a non-ASCII path and ensure we can cd into it.
+  wstring wNonAscii(wtest_tmpdir + L"\\" + kUtf16Text);
+  string nonAscii;
+  EXPECT_TRUE(strings::wcs_to_utf8(wNonAscii.c_str(), &nonAscii));
+  EXPECT_TRUE(CreateDirectoryW(wNonAscii.c_str(), NULL));
+  WCHAR cwd[MAX_PATH];
+  EXPECT_TRUE(GetCurrentDirectoryW(MAX_PATH, cwd));
+  // Ensure that we can cd into the path using SetCurrentDirectoryW.
+  EXPECT_TRUE(SetCurrentDirectoryW(wNonAscii.c_str()));
+  EXPECT_TRUE(SetCurrentDirectoryW(cwd));
+  // Ensure that we can cd into the path using chdir.
+  ASSERT_EQ(chdir(nonAscii.c_str()), 0);
+  // Ensure that the GetCurrentDirectoryW returns the desired path.
+  EXPECT_TRUE(GetCurrentDirectoryW(MAX_PATH, cwd));
+  ASSERT_EQ(wNonAscii, cwd);
+}
+
+TEST_F(IoWin32Test, AsWindowsPathTest) {
+  DWORD size = GetCurrentDirectoryW(0, NULL);
+  std::unique_ptr<wchar_t[]> cwd_str(new wchar_t[size]);
+  EXPECT_GT(GetCurrentDirectoryW(size, cwd_str.get()), 0);
+  wstring cwd = wstring(L"\\\\?\\") + cwd_str.get();
+
+  ASSERT_EQ(testonly_utf8_to_winpath("relative_mkdirtest"),
+            cwd + L"\\relative_mkdirtest");
+  ASSERT_EQ(testonly_utf8_to_winpath("preserve//\\trailing///"),
+            cwd + L"\\preserve\\trailing\\");
+  ASSERT_EQ(testonly_utf8_to_winpath("./normalize_me\\/../blah"),
+            cwd + L"\\blah");
+  std::ostringstream relpath;
+  for (wchar_t* p = cwd_str.get(); *p; ++p) {
+    if (*p == '/' || *p == '\\') {
+      relpath << "../";
+    }
+  }
+  relpath << ".\\/../\\./beyond-toplevel";
+  ASSERT_EQ(testonly_utf8_to_winpath(relpath.str().c_str()),
+            wstring(L"\\\\?\\") + cwd_str.get()[0] + L":\\beyond-toplevel");
+
+  // Absolute unix paths lack drive letters, driveless absolute windows paths
+  // do too. Neither can be converted to a drive-specifying absolute Windows
+  // path.
+  ASSERT_EQ(testonly_utf8_to_winpath("/absolute/unix/path"), L"");
+  // Though valid on Windows, we also don't support UNC paths (\\UNC\\blah).
+  ASSERT_EQ(testonly_utf8_to_winpath("\\driveless\\absolute"), L"");
+  // Though valid in cmd.exe, drive-relative paths are not supported.
+  ASSERT_EQ(testonly_utf8_to_winpath("c:foo"), L"");
+  ASSERT_EQ(testonly_utf8_to_winpath("c:/foo"), L"\\\\?\\c:\\foo");
+  ASSERT_EQ(testonly_utf8_to_winpath("\\\\?\\C:\\foo"), L"\\\\?\\C:\\foo");
+}
+
+TEST_F(IoWin32Test, Utf8Utf16ConversionTest) {
+  string mbs;
+  wstring wcs;
+  ASSERT_TRUE(strings::utf8_to_wcs(kUtf8Text, &wcs));
+  ASSERT_TRUE(strings::wcs_to_utf8(kUtf16Text, &mbs));
+  ASSERT_EQ(wcs, kUtf16Text);
+  ASSERT_EQ(mbs, kUtf8Text);
+}
+
+}  // namespace
+}  // namespace win32
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // defined(_WIN32)
+
diff --git a/src/google/protobuf/stubs/map_util.h b/src/google/protobuf/stubs/map_util.h
index 887f12a6..3e6d381f 100644
--- a/src/google/protobuf/stubs/map_util.h
+++ b/src/google/protobuf/stubs/map_util.h
@@ -654,7 +654,8 @@ InsertOrReturnExisting(
 //     delete EraseKeyReturnValuePtr(&my_map, "abc");
 //
 // Use returned value:
-//     scoped_ptr<MyType> value_ptr(EraseKeyReturnValuePtr(&my_map, "abc"));
+//     std::unique_ptr<MyType> value_ptr(
+//         EraseKeyReturnValuePtr(&my_map, "abc"));
 //     if (value_ptr.get())
 //       value_ptr->DoSomething();
 //
@@ -708,7 +709,7 @@ void AppendKeysFromMap(const MapContainer& map_container,
 // without the complexity of a SFINAE-based solution.)
 template <class MapContainer, class KeyType>
 void AppendKeysFromMap(const MapContainer& map_container,
-                       vector<KeyType>* key_container) {
+                       std::vector<KeyType>* key_container) {
   GOOGLE_CHECK(key_container != NULL);
   // We now have the opportunity to call reserve(). Calling reserve() every
   // time is a bad idea for some use cases: libstdc++'s implementation of
@@ -752,7 +753,7 @@ void AppendValuesFromMap(const MapContainer& map_container,
 // without the complexity of a SFINAE-based solution.)
 template <class MapContainer, class ValueType>
 void AppendValuesFromMap(const MapContainer& map_container,
-                         vector<ValueType>* value_container) {
+                         std::vector<ValueType>* value_container) {
   GOOGLE_CHECK(value_container != NULL);
   // See AppendKeysFromMap for why this is done.
   if (value_container->empty()) {
diff --git a/src/google/protobuf/stubs/mathlimits.h b/src/google/protobuf/stubs/mathlimits.h
index 275d9539..9c9d0e9a 100644
--- a/src/google/protobuf/stubs/mathlimits.h
+++ b/src/google/protobuf/stubs/mathlimits.h
@@ -43,18 +43,23 @@
 #ifndef UTIL_MATH_MATHLIMITS_H__
 #define UTIL_MATH_MATHLIMITS_H__
 
-// GCC 4.9 has a bug that makes it impossible to use isinf and isnan when both
-// <math.h> and <cmath> get pulled into the same translation unit.
-// Unfortunately it is difficult to prevent this from happening, so to work
-// around the problem we use std::isinf and std::isnan from <cmath> for C++11
-// builds and otherwise use the plain isinf and isnan functions from <math.h>.
 // Note that for Windows we do something different because it does not support
 // the plain isinf and isnan.
 #if __cplusplus >= 201103L
+// GCC 4.9 has a bug that makes isinf and isnan ambigious when both <math.h>
+// and <cmath> get pulled into the same translation unit. We use the ones in
+// std:: namespace explicitly for C++11
 #include <cmath>
+#define GOOGLE_PROTOBUF_USE_STD_CMATH
+#elif _GLIBCXX_USE_C99_MATH && !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
+// libstdc++ <cmath> header undefines the global macros and put functions in
+// std:: namespace even before C++11. Use the ones in std:: instead too.
+#include <cmath>
+#define GOOGLE_PROTOBUF_USE_STD_CMATH
 #else
 #include <math.h>
 #endif
+
 #include <string.h>
 
 #include <cfloat>
@@ -229,7 +234,7 @@ DECL_UNSIGNED_INT_LIMITS(unsigned long long int)
 // For non-Windows builds we use the std:: versions of isinf and isnan if they
 // are available; see the comment about <cmath> at the top of this file for the
 // details on why we need to do this.
-#if __cplusplus >= 201103L
+#ifdef GOOGLE_PROTOBUF_USE_STD_CMATH
 #define ISINF std::isinf
 #define ISNAN std::isnan
 #else
@@ -238,7 +243,7 @@ DECL_UNSIGNED_INT_LIMITS(unsigned long long int)
 #endif
 
 // ========================================================================= //
-#ifdef WIN32  // Lacks built-in isnan() and isinf()
+#if WIN32 && !__MINGW32__ // Lacks built-in isnan() and isinf()
 #define DECL_FP_LIMIT_FUNCS \
   static bool IsFinite(const Type x) { return _finite(x); } \
   static bool IsNaN(const Type x) { return _isnan(x); } \
diff --git a/src/google/protobuf/stubs/mutex.h b/src/google/protobuf/stubs/mutex.h
index 7ef1cb69..47edb7a3 100644
--- a/src/google/protobuf/stubs/mutex.h
+++ b/src/google/protobuf/stubs/mutex.h
@@ -30,53 +30,47 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_MUTEX_H_
 #define GOOGLE_PROTOBUF_STUBS_MUTEX_H_
 
-#ifdef GOOGLE_PROTOBUF_NO_THREADLOCAL
-#include <pthread.h>
-#endif
+#include <mutex>
 
 #include <google/protobuf/stubs/macros.h>
 
+// Define thread-safety annotations for use below, if we are building with
+// Clang.
+#if defined(__clang__) && !defined(SWIG)
+#define GOOGLE_PROTOBUF_ACQUIRE(...) \
+  __attribute__((acquire_capability(__VA_ARGS__)))
+#define GOOGLE_PROTOBUF_RELEASE(...) \
+  __attribute__((release_capability(__VA_ARGS__)))
+#else
+#define GOOGLE_PROTOBUF_ACQUIRE(...)
+#define GOOGLE_PROTOBUF_RELEASE(...)
+#endif
+
 // ===================================================================
 // emulates google3/base/mutex.h
 namespace google {
 namespace protobuf {
 namespace internal {
 
-// A Mutex is a non-reentrant (aka non-recursive) mutex.  At most one thread T
-// may hold a mutex at a given time.  If T attempts to Lock() the same Mutex
-// while holding it, T will deadlock.
-class LIBPROTOBUF_EXPORT Mutex {
- public:
-  // Create a Mutex that is not held by anybody.
-  Mutex();
-
-  // Destructor
-  ~Mutex();
-
-  // Block if necessary until this Mutex is free, then acquire it exclusively.
-  void Lock();
-
-  // Release this Mutex.  Caller must hold it exclusively.
-  void Unlock();
+#define GOOGLE_PROTOBUF_LINKER_INITIALIZED
 
+// Mutex is a natural type to wrap. As both google and other organization have
+// specialized mutexes. gRPC also provides an injection mechanism for custom
+// mutexes.
+class LIBPROTOBUF_EXPORT WrappedMutex {
+ public:
+  WrappedMutex() = default;
+  void Lock() GOOGLE_PROTOBUF_ACQUIRE() { mu_.lock(); }
+  void Unlock() GOOGLE_PROTOBUF_RELEASE() { mu_.unlock(); }
   // Crash if this Mutex is not held exclusively by this thread.
   // May fail to crash when it should; will never crash when it should not.
-  void AssertHeld();
+  void AssertHeld() const {}
 
  private:
-  struct Internal;
-  Internal* mInternal;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Mutex);
+  std::mutex mu_;
 };
 
-// Undefine the macros  to workaround the conflicts with Google internal
-// MutexLock implementation.
-// TODO(liujisi): Remove the undef once internal macros are removed.
-#undef MutexLock
-#undef ReaderMutexLock
-#undef WriterMutexLock
-#undef MutexLockMaybe
+using Mutex = WrappedMutex;
 
 // MutexLock(mu) acquires mu when constructed and releases it when destroyed.
 class LIBPROTOBUF_EXPORT MutexLock {
@@ -141,8 +135,10 @@ using internal::ReaderMutexLock;
 using internal::WriterMutexLock;
 using internal::MutexLockMaybe;
 
-
 }  // namespace protobuf
 }  // namespace google
 
+#undef GOOGLE_PROTOBUF_ACQUIRE
+#undef GOOGLE_PROTOBUF_RELEASE
+
 #endif  // GOOGLE_PROTOBUF_STUBS_MUTEX_H_
diff --git a/src/google/protobuf/stubs/once.cc b/src/google/protobuf/stubs/once.cc
deleted file mode 100644
index 889c6476..00000000
--- a/src/google/protobuf/stubs/once.cc
+++ /dev/null
@@ -1,99 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-//
-// emulates google3/base/once.h
-//
-// This header is intended to be included only by internal .cc files and
-// generated .pb.cc files.  Users should not use this directly.
-
-#include <google/protobuf/stubs/once.h>
-
-#ifndef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <sched.h>
-#endif
-
-#include <google/protobuf/stubs/atomicops.h>
-
-namespace google {
-namespace protobuf {
-
-namespace {
-
-void SchedYield() {
-#ifdef _WIN32
-  Sleep(0);
-#else  // POSIX
-  sched_yield();
-#endif
-}
-
-}  // namespace
-
-void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure) {
-  internal::AtomicWord state = internal::Acquire_Load(once);
-  // Fast path. The provided closure was already executed.
-  if (state == ONCE_STATE_DONE) {
-    return;
-  }
-  // The closure execution did not complete yet. The once object can be in one
-  // of the two following states:
-  //   - UNINITIALIZED: We are the first thread calling this function.
-  //   - EXECUTING_CLOSURE: Another thread is already executing the closure.
-  //
-  // First, try to change the state from UNINITIALIZED to EXECUTING_CLOSURE
-  // atomically.
-  state = internal::Acquire_CompareAndSwap(
-      once, ONCE_STATE_UNINITIALIZED, ONCE_STATE_EXECUTING_CLOSURE);
-  if (state == ONCE_STATE_UNINITIALIZED) {
-    // We are the first thread to call this function, so we have to call the
-    // closure.
-    closure->Run();
-    internal::Release_Store(once, ONCE_STATE_DONE);
-  } else {
-    // Another thread has already started executing the closure. We need to
-    // wait until it completes the initialization.
-    while (state == ONCE_STATE_EXECUTING_CLOSURE) {
-      // Note that futex() could be used here on Linux as an improvement.
-      SchedYield();
-      state = internal::Acquire_Load(once);
-    }
-  }
-}
-
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
diff --git a/src/google/protobuf/stubs/once.h b/src/google/protobuf/stubs/once.h
index 1f082c37..f3835ccd 100644
--- a/src/google/protobuf/stubs/once.h
+++ b/src/google/protobuf/stubs/once.h
@@ -78,88 +78,51 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_ONCE_H__
 #define GOOGLE_PROTOBUF_STUBS_ONCE_H__
 
-#include <google/protobuf/stubs/atomicops.h>
-#include <google/protobuf/stubs/callback.h>
-#include <google/protobuf/stubs/common.h>
+#include <mutex>
+#include <utility>
 
 namespace google {
 namespace protobuf {
+namespace internal {
 
-#ifdef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-typedef bool ProtobufOnceType;
-
-#define GOOGLE_PROTOBUF_ONCE_INIT false
-
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
-  if (!*once) {
-    *once = true;
-    init_func();
-  }
+using once_flag = std::once_flag;
+template <typename... Args>
+void call_once(Args&&... args ) {
+  std::call_once(std::forward<Args>(args)...);
 }
 
-template <typename Arg>
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)(Arg),
-    Arg arg) {
-  if (!*once) {
-    *once = true;
-    init_func(arg);
-  }
-}
+}  // namespace internal
 
-#else
-
-enum {
-  ONCE_STATE_UNINITIALIZED = 0,
-  ONCE_STATE_EXECUTING_CLOSURE = 1,
-  ONCE_STATE_DONE = 2
-};
-
-typedef internal::AtomicWord ProtobufOnceType;
-
-#define GOOGLE_PROTOBUF_ONCE_INIT ::google::protobuf::ONCE_STATE_UNINITIALIZED
-
-LIBPROTOBUF_EXPORT
-void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure);
+// TODO(gerbens) remove this once third_party is fully extracted
+using ProtobufOnceType = internal::once_flag;
 
 inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
-  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
-    internal::FunctionClosure0 func(init_func, false);
-    GoogleOnceInitImpl(once, &func);
-  }
+  std::call_once(*once, init_func);
 }
 
 template <typename Arg>
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)(Arg*),
-    Arg* arg) {
-  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
-    internal::FunctionClosure1<Arg*> func(init_func, false, arg);
-    GoogleOnceInitImpl(once, &func);
-  }
+inline void GoogleOnceInitArg(ProtobufOnceType* once, void (*init_func)(Arg*),
+                              Arg* arg) {
+  std::call_once(*once, init_func, arg);
 }
 
-#endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
 class GoogleOnceDynamic {
  public:
-  GoogleOnceDynamic() : state_(GOOGLE_PROTOBUF_ONCE_INIT) { }
-
   // If this->Init() has not been called before by any thread,
   // execute (*func_with_arg)(arg) then return.
   // Otherwise, wait until that prior invocation has finished
   // executing its function, then return.
   template<typename T>
   void Init(void (*func_with_arg)(T*), T* arg) {
-    GoogleOnceInit<T>(&this->state_,
-                      func_with_arg,
-                      arg);
+    GoogleOnceInitArg<T>(&this->state_, func_with_arg, arg);
   }
  private:
   ProtobufOnceType state_;
 };
 
+#define GOOGLE_PROTOBUF_ONCE_TYPE ::google::protobuf::ProtobufOnceType
 #define GOOGLE_PROTOBUF_DECLARE_ONCE(NAME) \
-  ::google::protobuf::ProtobufOnceType NAME = GOOGLE_PROTOBUF_ONCE_INIT
+  ::google::protobuf::ProtobufOnceType NAME
 
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/stubs/once_unittest.cc b/src/google/protobuf/stubs/once_unittest.cc
deleted file mode 100644
index d5f7779e..00000000
--- a/src/google/protobuf/stubs/once_unittest.cc
+++ /dev/null
@@ -1,254 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Author: kenton@google.com (Kenton Varda)
-
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <unistd.h>
-#include <pthread.h>
-#endif
-
-#include <google/protobuf/stubs/once.h>
-#include <google/protobuf/testing/googletest.h>
-#include <gtest/gtest.h>
-
-namespace google {
-namespace protobuf {
-namespace {
-
-class OnceInitTest : public testing::Test {
- protected:
-  void SetUp() {
-    state_ = INIT_NOT_STARTED;
-    current_test_ = this;
-  }
-
-  // Since ProtobufOnceType is only allowed to be allocated in static storage,
-  // each test must use a different pair of ProtobufOnceType objects which it
-  // must declare itself.
-  void SetOnces(ProtobufOnceType* once, ProtobufOnceType* recursive_once) {
-    once_ = once;
-    recursive_once_ = recursive_once;
-  }
-
-  void InitOnce() {
-    GoogleOnceInit(once_, &InitStatic);
-  }
-  void InitRecursiveOnce() {
-    GoogleOnceInit(recursive_once_, &InitRecursiveStatic);
-  }
-
-  void BlockInit() { init_blocker_.Lock(); }
-  void UnblockInit() { init_blocker_.Unlock(); }
-
-  class TestThread {
-   public:
-    TestThread(Closure* callback)
-        : done_(false), joined_(false), callback_(callback) {
-#ifdef _WIN32
-      thread_ = CreateThread(NULL, 0, &Start, this, 0, NULL);
-#else
-      pthread_create(&thread_, NULL, &Start, this);
-#endif
-    }
-    ~TestThread() {
-      if (!joined_) Join();
-    }
-
-    bool IsDone() {
-      MutexLock lock(&done_mutex_);
-      return done_;
-    }
-    void Join() {
-      joined_ = true;
-#ifdef _WIN32
-      WaitForSingleObject(thread_, INFINITE);
-      CloseHandle(thread_);
-#else
-      pthread_join(thread_, NULL);
-#endif
-    }
-
-   private:
-#ifdef _WIN32
-    HANDLE thread_;
-#else
-    pthread_t thread_;
-#endif
-
-    Mutex done_mutex_;
-    bool done_;
-    bool joined_;
-    Closure* callback_;
-
-#ifdef _WIN32
-    static DWORD WINAPI Start(LPVOID arg) {
-#else
-    static void* Start(void* arg) {
-#endif
-      reinterpret_cast<TestThread*>(arg)->Run();
-      return 0;
-    }
-
-    void Run() {
-      callback_->Run();
-      MutexLock lock(&done_mutex_);
-      done_ = true;
-    }
-  };
-
-  TestThread* RunInitOnceInNewThread() {
-    return new TestThread(NewCallback(this, &OnceInitTest::InitOnce));
-  }
-  TestThread* RunInitRecursiveOnceInNewThread() {
-    return new TestThread(
-        NewCallback(this, &OnceInitTest::InitRecursiveOnce));
-  }
-
-  enum State {
-    INIT_NOT_STARTED,
-    INIT_STARTED,
-    INIT_DONE
-  };
-  State CurrentState() {
-    MutexLock lock(&mutex_);
-    return state_;
-  }
-
-  void WaitABit() {
-#ifdef _WIN32
-    Sleep(1000);
-#else
-    sleep(1);
-#endif
-  }
-
- private:
-  Mutex mutex_;
-  Mutex init_blocker_;
-  State state_;
-  ProtobufOnceType* once_;
-  ProtobufOnceType* recursive_once_;
-
-  void Init() {
-    MutexLock lock(&mutex_);
-    EXPECT_EQ(INIT_NOT_STARTED, state_);
-    state_ = INIT_STARTED;
-    mutex_.Unlock();
-    init_blocker_.Lock();
-    init_blocker_.Unlock();
-    mutex_.Lock();
-    state_ = INIT_DONE;
-  }
-
-  static OnceInitTest* current_test_;
-  static void InitStatic() { current_test_->Init(); }
-  static void InitRecursiveStatic() { current_test_->InitOnce(); }
-};
-
-OnceInitTest* OnceInitTest::current_test_ = NULL;
-
-GOOGLE_PROTOBUF_DECLARE_ONCE(simple_once);
-
-TEST_F(OnceInitTest, Simple) {
-  SetOnces(&simple_once, NULL);
-
-  EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
-  InitOnce();
-  EXPECT_EQ(INIT_DONE, CurrentState());
-
-  // Calling again has no effect.
-  InitOnce();
-  EXPECT_EQ(INIT_DONE, CurrentState());
-}
-
-GOOGLE_PROTOBUF_DECLARE_ONCE(recursive_once1);
-GOOGLE_PROTOBUF_DECLARE_ONCE(recursive_once2);
-
-TEST_F(OnceInitTest, Recursive) {
-  SetOnces(&recursive_once1, &recursive_once2);
-
-  EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
-  InitRecursiveOnce();
-  EXPECT_EQ(INIT_DONE, CurrentState());
-}
-
-GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_once);
-
-TEST_F(OnceInitTest, MultipleThreads) {
-  SetOnces(&multiple_threads_once, NULL);
-
-  scoped_ptr<TestThread> threads[4];
-  EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
-  for (int i = 0; i < 4; i++) {
-    threads[i].reset(RunInitOnceInNewThread());
-  }
-  for (int i = 0; i < 4; i++) {
-    threads[i]->Join();
-  }
-  EXPECT_EQ(INIT_DONE, CurrentState());
-}
-
-GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_blocked_once1);
-GOOGLE_PROTOBUF_DECLARE_ONCE(multiple_threads_blocked_once2);
-
-TEST_F(OnceInitTest, MultipleThreadsBlocked) {
-  SetOnces(&multiple_threads_blocked_once1, &multiple_threads_blocked_once2);
-
-  scoped_ptr<TestThread> threads[8];
-  EXPECT_EQ(INIT_NOT_STARTED, CurrentState());
-
-  BlockInit();
-  for (int i = 0; i < 4; i++) {
-    threads[i].reset(RunInitOnceInNewThread());
-  }
-  for (int i = 4; i < 8; i++) {
-    threads[i].reset(RunInitRecursiveOnceInNewThread());
-  }
-
-  WaitABit();
-
-  // We should now have one thread blocked inside Init(), four blocked waiting
-  // for Init() to complete, and three blocked waiting for InitRecursive() to
-  // complete.
-  EXPECT_EQ(INIT_STARTED, CurrentState());
-  UnblockInit();
-
-  for (int i = 0; i < 8; i++) {
-    threads[i]->Join();
-  }
-  EXPECT_EQ(INIT_DONE, CurrentState());
-}
-
-}  // anonymous namespace
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/stubs/platform_macros.h b/src/google/protobuf/stubs/platform_macros.h
index 7a54060d..c3a64dd2 100644
--- a/src/google/protobuf/stubs/platform_macros.h
+++ b/src/google/protobuf/stubs/platform_macros.h
@@ -50,6 +50,9 @@
 #elif defined(_M_ARM) || defined(__ARMEL__)
 #define GOOGLE_PROTOBUF_ARCH_ARM 1
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
+#elif defined(_M_ARM64)
+#define GOOGLE_PROTOBUF_ARCH_ARM 1
+#define GOOGLE_PROTOBUF_ARCH_64_BIT 1
 #elif defined(__aarch64__)
 #define GOOGLE_PROTOBUF_ARCH_AARCH64 1
 #define GOOGLE_PROTOBUF_ARCH_64_BIT 1
diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
index 6f0633c4..6b52305f 100644
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -44,6 +44,8 @@
 #include <stdint.h>
 #endif
 
+#include <google/protobuf/stubs/platform_macros.h>
+
 #undef PROTOBUF_LITTLE_ENDIAN
 #ifdef _WIN32
   // Assuming windows is always little-endian.
@@ -89,12 +91,15 @@
 // These #includes are for the byte swap functions declared later on.
 #ifdef _MSC_VER
 #include <stdlib.h>  // NOLINT(build/include)
+#include <intrin.h>
 #elif defined(__APPLE__)
 #include <libkern/OSByteOrder.h>
-#elif defined(__GLIBC__) || defined(__CYGWIN__)
+#elif defined(__GLIBC__) || defined(__BIONIC__) || defined(__CYGWIN__)
 #include <byteswap.h>  // IWYU pragma: export
 #endif
 
+#define PROTOBUF_RUNTIME_DEPRECATED(message)
+
 // ===================================================================
 // from google3/base/port.h
 
@@ -106,6 +111,18 @@
 #define LANG_CXX11 1
 #endif
 
+#if LANG_CXX11 && !defined(__NVCC__)
+#define PROTOBUF_CXX11 1
+#else
+#define PROTOBUF_CXX11 0
+#endif
+
+#if PROTOBUF_CXX11
+#define PROTOBUF_FINAL final
+#else
+#define PROTOBUF_FINAL
+#endif
+
 namespace google {
 namespace protobuf {
 
@@ -175,6 +192,8 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
 #endif
 #endif
 
+#define GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE GOOGLE_ATTRIBUTE_ALWAYS_INLINE
+
 #ifndef GOOGLE_ATTRIBUTE_NOINLINE
 #if defined(__GNUC__) && (__GNUC__ > 3 ||(__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
 // For functions we want to force not inline.
@@ -189,24 +208,21 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
 #endif
 #endif
 
-#ifndef GOOGLE_ATTRIBUTE_NORETURN
-#ifdef __GNUC__
-// Tell the compiler that a given function never returns.
-#define GOOGLE_ATTRIBUTE_NORETURN __attribute__((noreturn))
-#else
-#define GOOGLE_ATTRIBUTE_NORETURN
-#endif
-#endif
+#define GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE GOOGLE_ATTRIBUTE_NOINLINE
 
-#ifndef GOOGLE_ATTRIBUTE_DEPRECATED
-#ifdef __GNUC__
-// If the method/variable/type is used anywhere, produce a warning.
-#define GOOGLE_ATTRIBUTE_DEPRECATED __attribute__((deprecated))
+#ifndef GOOGLE_ATTRIBUTE_FUNC_ALIGN
+#if defined(__clang__) || \
+    defined(__GNUC__) && (__GNUC__ > 4 ||(__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
+// Function alignment attribute introduced in gcc 4.3
+#define GOOGLE_ATTRIBUTE_FUNC_ALIGN(bytes) __attribute__ ((aligned(bytes)))
 #else
-#define GOOGLE_ATTRIBUTE_DEPRECATED
+#define GOOGLE_ATTRIBUTE_FUNC_ALIGN(bytes)
 #endif
 #endif
 
+#define GOOGLE_PROTOBUF_ATTRIBUTE_FUNC_ALIGN(bytes) \
+        GOOGLE_ATTRIBUTE_FUNC_ALIGN(bytes)
+
 #ifndef GOOGLE_PREDICT_TRUE
 #ifdef __GNUC__
 // Provided at least since GCC 3.0.
@@ -225,6 +241,13 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
 #endif
 #endif
 
+#ifndef GOOGLE_PROTOBUF_ATTRIBUTE_RETURNS_NONNULL
+#ifdef __GNUC__
+#define GOOGLE_PROTOBUF_ATTRIBUTE_RETURNS_NONNULL \
+    __attribute__((returns_nonnull))
+#endif
+#endif
+
 // Delimits a block of code which may write to memory which is simultaneously
 // written by other threads, but which has been determined to be thread-safe
 // (e.g. because it is an idempotent write).
@@ -235,24 +258,62 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
 #define GOOGLE_SAFE_CONCURRENT_WRITES_END()
 #endif
 
-#if defined(__clang__) && defined(__has_cpp_attribute) \
-    && !defined(GOOGLE_PROTOBUF_OS_APPLE)
-# if defined(GOOGLE_PROTOBUF_OS_NACL) || defined(EMSCRIPTEN) || \
-     __has_cpp_attribute(clang::fallthrough)
-#  define GOOGLE_FALLTHROUGH_INTENDED [[clang::fallthrough]]
+#define GOOGLE_GUARDED_BY(x)
+#define GOOGLE_ATTRIBUTE_COLD
+
+#ifdef GOOGLE_PROTOBUF_DONT_USE_UNALIGNED
+# define GOOGLE_PROTOBUF_USE_UNALIGNED 0
+#else
+# if defined(_M_X64) || defined(__x86_64__) || defined(_M_IX86) || defined(__i386__)
+#  define GOOGLE_PROTOBUF_USE_UNALIGNED 1
+# else
+#  define GOOGLE_PROTOBUF_USE_UNALIGNED 0
 # endif
 #endif
 
-#ifndef GOOGLE_FALLTHROUGH_INTENDED
-# define GOOGLE_FALLTHROUGH_INTENDED
-#endif
+#define GOOGLE_PROTOBUF_ATTRIBUTE_COLD GOOGLE_ATTRIBUTE_COLD
 
-#define GOOGLE_GUARDED_BY(x)
-#define GOOGLE_ATTRIBUTE_COLD
+#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) ||\
+    defined(MEMORY_SANITIZER)
 
-// x86 and x86-64 can perform unaligned loads/stores directly.
-#if defined(_M_X64) || defined(__x86_64__) || \
-    defined(_M_IX86) || defined(__i386__)
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+uint16_t __sanitizer_unaligned_load16(const void *p);
+uint32_t __sanitizer_unaligned_load32(const void *p);
+uint64_t __sanitizer_unaligned_load64(const void *p);
+void __sanitizer_unaligned_store16(void *p, uint16_t v);
+void __sanitizer_unaligned_store32(void *p, uint32_t v);
+void __sanitizer_unaligned_store64(void *p, uint64_t v);
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+inline uint16 GOOGLE_UNALIGNED_LOAD16(const void *p) {
+  return __sanitizer_unaligned_load16(p);
+}
+
+inline uint32 GOOGLE_UNALIGNED_LOAD32(const void *p) {
+  return __sanitizer_unaligned_load32(p);
+}
+
+inline uint64 GOOGLE_UNALIGNED_LOAD64(const void *p) {
+  return __sanitizer_unaligned_load64(p);
+}
+
+inline void GOOGLE_UNALIGNED_STORE16(void *p, uint16 v) {
+  __sanitizer_unaligned_store16(p, v);
+}
+
+inline void GOOGLE_UNALIGNED_STORE32(void *p, uint32 v) {
+  __sanitizer_unaligned_store32(p, v);
+}
+
+inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
+  __sanitizer_unaligned_store64(p, v);
+}
+
+#elif GOOGLE_PROTOBUF_USE_UNALIGNED
 
 #define GOOGLE_UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
 #define GOOGLE_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))
@@ -294,6 +355,13 @@ inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
 }
 #endif
 
+#if defined(GOOGLE_PROTOBUF_OS_NACL) \
+    || (defined(__ANDROID__) && defined(__clang__) \
+        && (__clang_major__ == 3 && __clang_minor__ == 8) \
+        && (__clang_patchlevel__ < 275480))
+# define GOOGLE_PROTOBUF_USE_PORTABLE_LOG2
+#endif
+
 #if defined(_MSC_VER)
 #define GOOGLE_THREAD_LOCAL __declspec(thread)
 #else
@@ -312,7 +380,7 @@ inline void GOOGLE_UNALIGNED_STORE64(void *p, uint64 v) {
 #define bswap_32(x) OSSwapInt32(x)
 #define bswap_64(x) OSSwapInt64(x)
 
-#elif !defined(__GLIBC__) && !defined(__CYGWIN__)
+#elif !defined(__GLIBC__) && !defined(__BIONIC__) && !defined(__CYGWIN__)
 
 static inline uint16 bswap_16(uint16 x) {
   return static_cast<uint16>(((x & 0xFF) << 8) | ((x & 0xFF00) >> 8));
@@ -346,21 +414,29 @@ class Bits {
  public:
   static uint32 Log2FloorNonZero(uint32 n) {
 #if defined(__GNUC__)
-  return 31 ^ __builtin_clz(n);
-#elif defined(COMPILER_MSVC) && defined(_M_IX86)
-  _asm {
-    bsr ebx, n
-    mov n, ebx
-  }
-  return n;
+  return 31 ^ static_cast<uint32>(__builtin_clz(n));
+#elif defined(_MSC_VER)
+  unsigned long where;
+  _BitScanReverse(&where, n);
+  return where;
 #else
   return Log2FloorNonZero_Portable(n);
 #endif
   }
 
   static uint32 Log2FloorNonZero64(uint64 n) {
-#if defined(__GNUC__)
-  return 63 ^ __builtin_clzll(n);
+    // Older versions of clang run into an instruction-selection failure when
+    // it encounters __builtin_clzll:
+    // https://bugs.chromium.org/p/nativeclient/issues/detail?id=4395
+    // This includes arm-nacl-clang and clang in older Android NDK versions.
+    // To work around this, when we build with those we use the portable
+    // implementation instead.
+#if defined(__GNUC__) && !defined(GOOGLE_PROTOBUF_USE_PORTABLE_LOG2)
+  return 63 ^ static_cast<uint32>(__builtin_clzll(n));
+#elif defined(_MSC_VER) && defined(_M_X64)
+  unsigned long where;
+  _BitScanReverse64(&where, n);
+  return where;
 #else
   return Log2FloorNonZero64_Portable(n);
 #endif
@@ -387,9 +463,9 @@ class Bits {
     const uint32 topbits = static_cast<uint32>(n >> 32);
     if (topbits == 0) {
       // Top bits are zero, so scan in bottom bits
-      return Log2FloorNonZero(static_cast<uint32>(n));
+      return static_cast<int>(Log2FloorNonZero(static_cast<uint32>(n)));
     } else {
-      return 32 + Log2FloorNonZero(topbits);
+      return 32 + static_cast<int>(Log2FloorNonZero(topbits));
     }
   }
 };
@@ -454,6 +530,12 @@ class BigEndian {
   }
 };
 
+#ifndef GOOGLE_ATTRIBUTE_SECTION_VARIABLE
+#define GOOGLE_ATTRIBUTE_SECTION_VARIABLE(name)
+#endif
+
+#define GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(name)
+
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/stubs/scoped_ptr.h b/src/google/protobuf/stubs/scoped_ptr.h
deleted file mode 100644
index 4423c118..00000000
--- a/src/google/protobuf/stubs/scoped_ptr.h
+++ /dev/null
@@ -1,236 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_
-#define GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_
-
-#include <google/protobuf/stubs/port.h>
-
-namespace google {
-namespace protobuf {
-
-// ===================================================================
-// from google3/base/scoped_ptr.h
-
-namespace internal {
-
-//  This is an implementation designed to match the anticipated future TR2
-//  implementation of the scoped_ptr class, and its closely-related brethren,
-//  scoped_array, scoped_ptr_malloc, and make_scoped_ptr.
-
-template <class C> class scoped_ptr;
-template <class C> class scoped_array;
-
-// A scoped_ptr<T> is like a T*, except that the destructor of scoped_ptr<T>
-// automatically deletes the pointer it holds (if any).
-// That is, scoped_ptr<T> owns the T object that it points to.
-// Like a T*, a scoped_ptr<T> may hold either NULL or a pointer to a T object.
-//
-// The size of a scoped_ptr is small:
-// sizeof(scoped_ptr<C>) == sizeof(C*)
-template <class C>
-class scoped_ptr {
- public:
-
-  // The element type
-  typedef C element_type;
-
-  // Constructor.  Defaults to initializing with NULL.
-  // There is no way to create an uninitialized scoped_ptr.
-  // The input parameter must be allocated with new.
-  explicit scoped_ptr(C* p = NULL) : ptr_(p) { }
-
-  // Destructor.  If there is a C object, delete it.
-  // We don't need to test ptr_ == NULL because C++ does that for us.
-  ~scoped_ptr() {
-    enum { type_must_be_complete = sizeof(C) };
-    delete ptr_;
-  }
-
-  // Reset.  Deletes the current owned object, if any.
-  // Then takes ownership of a new object, if given.
-  // this->reset(this->get()) works.
-  void reset(C* p = NULL) {
-    if (p != ptr_) {
-      enum { type_must_be_complete = sizeof(C) };
-      delete ptr_;
-      ptr_ = p;
-    }
-  }
-
-  // Accessors to get the owned object.
-  // operator* and operator-> will assert() if there is no current object.
-  C& operator*() const {
-    assert(ptr_ != NULL);
-    return *ptr_;
-  }
-  C* operator->() const  {
-    assert(ptr_ != NULL);
-    return ptr_;
-  }
-  C* get() const { return ptr_; }
-
-  // Comparison operators.
-  // These return whether two scoped_ptr refer to the same object, not just to
-  // two different but equal objects.
-  bool operator==(C* p) const { return ptr_ == p; }
-  bool operator!=(C* p) const { return ptr_ != p; }
-
-  // Swap two scoped pointers.
-  void swap(scoped_ptr& p2) {
-    C* tmp = ptr_;
-    ptr_ = p2.ptr_;
-    p2.ptr_ = tmp;
-  }
-
-  // Release a pointer.
-  // The return value is the current pointer held by this object.
-  // If this object holds a NULL pointer, the return value is NULL.
-  // After this operation, this object will hold a NULL pointer,
-  // and will not own the object any more.
-  C* release() {
-    C* retVal = ptr_;
-    ptr_ = NULL;
-    return retVal;
-  }
-
- private:
-  C* ptr_;
-
-  // Forbid comparison of scoped_ptr types.  If C2 != C, it totally doesn't
-  // make sense, and if C2 == C, it still doesn't make sense because you should
-  // never have the same object owned by two different scoped_ptrs.
-  template <class C2> bool operator==(scoped_ptr<C2> const& p2) const;
-  template <class C2> bool operator!=(scoped_ptr<C2> const& p2) const;
-
-  // Disallow evil constructors
-  scoped_ptr(const scoped_ptr&);
-  void operator=(const scoped_ptr&);
-};
-
-// scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
-// with new [] and the destructor deletes objects with delete [].
-//
-// As with scoped_ptr<C>, a scoped_array<C> either points to an object
-// or is NULL.  A scoped_array<C> owns the object that it points to.
-//
-// Size: sizeof(scoped_array<C>) == sizeof(C*)
-template <class C>
-class scoped_array {
- public:
-
-  // The element type
-  typedef C element_type;
-
-  // Constructor.  Defaults to initializing with NULL.
-  // There is no way to create an uninitialized scoped_array.
-  // The input parameter must be allocated with new [].
-  explicit scoped_array(C* p = NULL) : array_(p) { }
-
-  // Destructor.  If there is a C object, delete it.
-  // We don't need to test ptr_ == NULL because C++ does that for us.
-  ~scoped_array() {
-    enum { type_must_be_complete = sizeof(C) };
-    delete[] array_;
-  }
-
-  // Reset.  Deletes the current owned object, if any.
-  // Then takes ownership of a new object, if given.
-  // this->reset(this->get()) works.
-  void reset(C* p = NULL) {
-    if (p != array_) {
-      enum { type_must_be_complete = sizeof(C) };
-      delete[] array_;
-      array_ = p;
-    }
-  }
-
-  // Get one element of the current object.
-  // Will assert() if there is no current object, or index i is negative.
-  C& operator[](std::ptrdiff_t i) const {
-    assert(i >= 0);
-    assert(array_ != NULL);
-    return array_[i];
-  }
-
-  // Get a pointer to the zeroth element of the current object.
-  // If there is no current object, return NULL.
-  C* get() const {
-    return array_;
-  }
-
-  // Comparison operators.
-  // These return whether two scoped_array refer to the same object, not just to
-  // two different but equal objects.
-  bool operator==(C* p) const { return array_ == p; }
-  bool operator!=(C* p) const { return array_ != p; }
-
-  // Swap two scoped arrays.
-  void swap(scoped_array& p2) {
-    C* tmp = array_;
-    array_ = p2.array_;
-    p2.array_ = tmp;
-  }
-
-  // Release an array.
-  // The return value is the current pointer held by this object.
-  // If this object holds a NULL pointer, the return value is NULL.
-  // After this operation, this object will hold a NULL pointer,
-  // and will not own the object any more.
-  C* release() {
-    C* retVal = array_;
-    array_ = NULL;
-    return retVal;
-  }
-
- private:
-  C* array_;
-
-  // Forbid comparison of different scoped_array types.
-  template <class C2> bool operator==(scoped_array<C2> const& p2) const;
-  template <class C2> bool operator!=(scoped_array<C2> const& p2) const;
-
-  // Disallow evil constructors
-  scoped_array(const scoped_array&);
-  void operator=(const scoped_array&);
-};
-
-}  // namespace internal
-
-// We made these internal so that they would show up as such in the docs,
-// but we don't want to stick "internal::" in front of them everywhere.
-using internal::scoped_ptr;
-using internal::scoped_array;
-
-
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_STUBS_SCOPED_PTR_H_
diff --git a/src/google/protobuf/stubs/shared_ptr.h b/src/google/protobuf/stubs/shared_ptr.h
deleted file mode 100644
index d250bf4d..00000000
--- a/src/google/protobuf/stubs/shared_ptr.h
+++ /dev/null
@@ -1,470 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2014 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// from google3/util/gtl/shared_ptr.h
-
-#ifndef GOOGLE_PROTOBUF_STUBS_SHARED_PTR_H__
-#define GOOGLE_PROTOBUF_STUBS_SHARED_PTR_H__
-
-#include <google/protobuf/stubs/atomicops.h>
-
-#include <algorithm>  // for swap
-#include <stddef.h>
-#include <memory>
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// Alias to std::shared_ptr for any C++11 platform,
-// and for any supported MSVC compiler.
-#if !defined(UTIL_GTL_USE_STD_SHARED_PTR) && \
-    (defined(COMPILER_MSVC) || defined(LANG_CXX11))
-#define UTIL_GTL_USE_STD_SHARED_PTR 1
-#endif
-
-#if defined(UTIL_GTL_USE_STD_SHARED_PTR) && UTIL_GTL_USE_STD_SHARED_PTR
-
-// These are transitional.  They will be going away soon.
-// Please just #include <memory> and just type std::shared_ptr yourself, instead
-// of relying on this file.
-//
-// Migration doc: http://go/std-shared-ptr-lsc
-using std::enable_shared_from_this;
-using std::shared_ptr;
-using std::static_pointer_cast;
-using std::weak_ptr;
-
-#else  // below, UTIL_GTL_USE_STD_SHARED_PTR not set or set to 0.
-
-// For everything else there is the google3 implementation.
-inline bool RefCountDec(volatile Atomic32 *ptr) {
-  return Barrier_AtomicIncrement(ptr, -1) != 0;
-}
-
-inline void RefCountInc(volatile Atomic32 *ptr) {
-  NoBarrier_AtomicIncrement(ptr, 1);
-}
-
-template <typename T> class shared_ptr;
-template <typename T> class weak_ptr;
-
-// This class is an internal implementation detail for shared_ptr. If two
-// shared_ptrs point to the same object, they also share a control block.
-// An "empty" shared_pointer refers to NULL and also has a NULL control block.
-// It contains all of the state that's needed for reference counting or any
-// other kind of resource management. In this implementation the control block
-// happens to consist of two atomic words, the reference count (the number
-// of shared_ptrs that share ownership of the object) and the weak count
-// (the number of weak_ptrs that observe the object, plus 1 if the
-// refcount is nonzero).
-//
-// The "plus 1" is to prevent a race condition in the shared_ptr and
-// weak_ptr destructors. We need to make sure the control block is
-// only deleted once, so we need to make sure that at most one
-// object sees the weak count decremented from 1 to 0.
-class SharedPtrControlBlock {
-  template <typename T> friend class shared_ptr;
-  template <typename T> friend class weak_ptr;
- private:
-  SharedPtrControlBlock() : refcount_(1), weak_count_(1) { }
-  Atomic32 refcount_;
-  Atomic32 weak_count_;
-};
-
-// Forward declaration. The class is defined below.
-template <typename T> class enable_shared_from_this;
-
-template <typename T>
-class shared_ptr {
-  template <typename U> friend class weak_ptr;
- public:
-  typedef T element_type;
-
-  shared_ptr() : ptr_(NULL), control_block_(NULL) {}
-
-  explicit shared_ptr(T* ptr)
-      : ptr_(ptr),
-        control_block_(ptr != NULL ? new SharedPtrControlBlock : NULL) {
-    // If p is non-null and T inherits from enable_shared_from_this, we
-    // set up the data that shared_from_this needs.
-    MaybeSetupWeakThis(ptr);
-  }
-
-  // Copy constructor: makes this object a copy of ptr, and increments
-  // the reference count.
-  template <typename U>
-  shared_ptr(const shared_ptr<U>& ptr)
-      : ptr_(NULL),
-        control_block_(NULL) {
-    Initialize(ptr);
-  }
-  // Need non-templated version to prevent the compiler-generated default
-  shared_ptr(const shared_ptr<T>& ptr)
-      : ptr_(NULL),
-        control_block_(NULL) {
-    Initialize(ptr);
-  }
-
-  // Assignment operator. Replaces the existing shared_ptr with ptr.
-  // Increment ptr's reference count and decrement the one being replaced.
-  template <typename U>
-  shared_ptr<T>& operator=(const shared_ptr<U>& ptr) {
-    if (ptr_ != ptr.ptr_) {
-      shared_ptr<T> me(ptr);   // will hold our previous state to be destroyed.
-      swap(me);
-    }
-    return *this;
-  }
-
-  // Need non-templated version to prevent the compiler-generated default
-  shared_ptr<T>& operator=(const shared_ptr<T>& ptr) {
-    if (ptr_ != ptr.ptr_) {
-      shared_ptr<T> me(ptr);   // will hold our previous state to be destroyed.
-      swap(me);
-    }
-    return *this;
-  }
-
-  // TODO(austern): Consider providing this constructor. The draft C++ standard
-  // (20.8.10.2.1) includes it. However, it says that this constructor throws
-  // a bad_weak_ptr exception when ptr is expired. Is it better to provide this
-  // constructor and make it do something else, like fail with a CHECK, or to
-  // leave this constructor out entirely?
-  //
-  // template <typename U>
-  // shared_ptr(const weak_ptr<U>& ptr);
-
-  ~shared_ptr() {
-    if (ptr_ != NULL) {
-      if (!RefCountDec(&control_block_->refcount_)) {
-        delete ptr_;
-
-        // weak_count_ is defined as the number of weak_ptrs that observe
-        // ptr_, plus 1 if refcount_ is nonzero.
-        if (!RefCountDec(&control_block_->weak_count_)) {
-          delete control_block_;
-        }
-      }
-    }
-  }
-
-  // Replaces underlying raw pointer with the one passed in.  The reference
-  // count is set to one (or zero if the pointer is NULL) for the pointer
-  // being passed in and decremented for the one being replaced.
-  //
-  // If you have a compilation error with this code, make sure you aren't
-  // passing NULL, nullptr, or 0 to this function.  Call reset without an
-  // argument to reset to a null ptr.
-  template <typename Y>
-  void reset(Y* p) {
-    if (p != ptr_) {
-      shared_ptr<T> tmp(p);
-      tmp.swap(*this);
-    }
-  }
-
-  void reset() {
-    reset(static_cast<T*>(NULL));
-  }
-
-  // Exchanges the contents of this with the contents of r.  This function
-  // supports more efficient swapping since it eliminates the need for a
-  // temporary shared_ptr object.
-  void swap(shared_ptr<T>& r) {
-    using std::swap;  // http://go/using-std-swap
-    swap(ptr_, r.ptr_);
-    swap(control_block_, r.control_block_);
-  }
-
-  // The following function is useful for gaining access to the underlying
-  // pointer when a shared_ptr remains in scope so the reference-count is
-  // known to be > 0 (e.g. for parameter passing).
-  T* get() const {
-    return ptr_;
-  }
-
-  T& operator*() const {
-    return *ptr_;
-  }
-
-  T* operator->() const {
-    return ptr_;
-  }
-
-  long use_count() const {
-    return control_block_ ? control_block_->refcount_ : 1;
-  }
-
-  bool unique() const {
-    return use_count() == 1;
-  }
-
- private:
-  // If r is non-empty, initialize *this to share ownership with r,
-  // increasing the underlying reference count.
-  // If r is empty, *this remains empty.
-  // Requires: this is empty, namely this->ptr_ == NULL.
-  template <typename U>
-  void Initialize(const shared_ptr<U>& r) {
-    // This performs a static_cast on r.ptr_ to U*, which is a no-op since it
-    // is already a U*. So initialization here requires that r.ptr_ is
-    // implicitly convertible to T*.
-    InitializeWithStaticCast<U>(r);
-  }
-
-  // Initializes *this as described in Initialize, but additionally performs a
-  // static_cast from r.ptr_ (V*) to U*.
-  // NOTE(gfc): We'd need a more general form to support const_pointer_cast and
-  // dynamic_pointer_cast, but those operations are sufficiently discouraged
-  // that supporting static_pointer_cast is sufficient.
-  template <typename U, typename V>
-  void InitializeWithStaticCast(const shared_ptr<V>& r) {
-    if (r.control_block_ != NULL) {
-      RefCountInc(&r.control_block_->refcount_);
-
-      ptr_ = static_cast<U*>(r.ptr_);
-      control_block_ = r.control_block_;
-    }
-  }
-
-  // Helper function for the constructor that takes a raw pointer. If T
-  // doesn't inherit from enable_shared_from_this<T> then we have nothing to
-  // do, so this function is trivial and inline. The other version is declared
-  // out of line, after the class definition of enable_shared_from_this.
-  void MaybeSetupWeakThis(enable_shared_from_this<T>* ptr);
-  void MaybeSetupWeakThis(...) { }
-
-  T* ptr_;
-  SharedPtrControlBlock* control_block_;
-
-#ifndef SWIG
-  template <typename U>
-  friend class shared_ptr;
-
-  template <typename U, typename V>
-  friend shared_ptr<U> static_pointer_cast(const shared_ptr<V>& rhs);
-#endif
-};
-
-// Matches the interface of std::swap as an aid to generic programming.
-template <typename T> void swap(shared_ptr<T>& r, shared_ptr<T>& s) {
-  r.swap(s);
-}
-
-template <typename T, typename U>
-shared_ptr<T> static_pointer_cast(const shared_ptr<U>& rhs) {
-  shared_ptr<T> lhs;
-  lhs.template InitializeWithStaticCast<T>(rhs);
-  return lhs;
-}
-
-// See comments at the top of the file for a description of why this
-// class exists, and the draft C++ standard (as of July 2009 the
-// latest draft is N2914) for the detailed specification.
-template <typename T>
-class weak_ptr {
-  template <typename U> friend class weak_ptr;
- public:
-  typedef T element_type;
-
-  // Create an empty (i.e. already expired) weak_ptr.
-  weak_ptr() : ptr_(NULL), control_block_(NULL) { }
-
-  // Create a weak_ptr that observes the same object that ptr points
-  // to.  Note that there is no race condition here: we know that the
-  // control block can't disappear while we're looking at it because
-  // it is owned by at least one shared_ptr, ptr.
-  template <typename U> weak_ptr(const shared_ptr<U>& ptr) {
-    CopyFrom(ptr.ptr_, ptr.control_block_);
-  }
-
-  // Copy a weak_ptr. The object it points to might disappear, but we
-  // don't care: we're only working with the control block, and it can't
-  // disappear while we're looking at because it's owned by at least one
-  // weak_ptr, ptr.
-  template <typename U> weak_ptr(const weak_ptr<U>& ptr) {
-    CopyFrom(ptr.ptr_, ptr.control_block_);
-  }
-
-  // Need non-templated version to prevent default copy constructor
-  weak_ptr(const weak_ptr& ptr) {
-    CopyFrom(ptr.ptr_, ptr.control_block_);
-  }
-
-  // Destroy the weak_ptr. If no shared_ptr owns the control block, and if
-  // we are the last weak_ptr to own it, then it can be deleted. Note that
-  // weak_count_ is defined as the number of weak_ptrs sharing this control
-  // block, plus 1 if there are any shared_ptrs. We therefore know that it's
-  // safe to delete the control block when weak_count_ reaches 0, without
-  // having to perform any additional tests.
-  ~weak_ptr() {
-    if (control_block_ != NULL &&
-        !RefCountDec(&control_block_->weak_count_)) {
-      delete control_block_;
-    }
-  }
-
-  weak_ptr& operator=(const weak_ptr& ptr) {
-    if (&ptr != this) {
-      weak_ptr tmp(ptr);
-      tmp.swap(*this);
-    }
-    return *this;
-  }
-  template <typename U> weak_ptr& operator=(const weak_ptr<U>& ptr) {
-    weak_ptr tmp(ptr);
-    tmp.swap(*this);
-    return *this;
-  }
-  template <typename U> weak_ptr& operator=(const shared_ptr<U>& ptr) {
-    weak_ptr tmp(ptr);
-    tmp.swap(*this);
-    return *this;
-  }
-
-  void swap(weak_ptr& ptr) {
-    using std::swap;  // http://go/using-std-swap
-    swap(ptr_, ptr.ptr_);
-    swap(control_block_, ptr.control_block_);
-  }
-
-  void reset() {
-    weak_ptr tmp;
-    tmp.swap(*this);
-  }
-
-  // Return the number of shared_ptrs that own the object we are observing.
-  // Note that this number can be 0 (if this pointer has expired).
-  long use_count() const {
-    return control_block_ != NULL ? control_block_->refcount_ : 0;
-  }
-
-  bool expired() const { return use_count() == 0; }
-
-  // Return a shared_ptr that owns the object we are observing. If we
-  // have expired, the shared_ptr will be empty. We have to be careful
-  // about concurrency, though, since some other thread might be
-  // destroying the last owning shared_ptr while we're in this
-  // function.  We want to increment the refcount only if it's nonzero
-  // and get the new value, and we want that whole operation to be
-  // atomic.
-  shared_ptr<T> lock() const {
-    shared_ptr<T> result;
-    if (control_block_ != NULL) {
-      Atomic32 old_refcount;
-      do {
-        old_refcount = control_block_->refcount_;
-        if (old_refcount == 0)
-          break;
-      } while (old_refcount !=
-               NoBarrier_CompareAndSwap(
-                   &control_block_->refcount_, old_refcount,
-                   old_refcount + 1));
-      if (old_refcount > 0) {
-        result.ptr_ = ptr_;
-        result.control_block_ = control_block_;
-      }
-    }
-
-    return result;
-  }
-
- private:
-  void CopyFrom(T* ptr, SharedPtrControlBlock* control_block) {
-    ptr_ = ptr;
-    control_block_ = control_block;
-    if (control_block_ != NULL)
-      RefCountInc(&control_block_->weak_count_);
-  }
-
- private:
-  element_type* ptr_;
-  SharedPtrControlBlock* control_block_;
-};
-
-template <typename T> void swap(weak_ptr<T>& r, weak_ptr<T>& s) {
-  r.swap(s);
-}
-
-// See comments at the top of the file for a description of why this class
-// exists, and section 20.8.10.5 of the draft C++ standard (as of July 2009
-// the latest draft is N2914) for the detailed specification.
-template <typename T>
-class enable_shared_from_this {
-  friend class shared_ptr<T>;
- public:
-  // Precondition: there must be a shared_ptr that owns *this and that was
-  // created, directly or indirectly, from a raw pointer of type T*. (The
-  // latter part of the condition is technical but not quite redundant; it
-  // rules out some complicated uses involving inheritance hierarchies.)
-  shared_ptr<T> shared_from_this() {
-    // Behavior is undefined if the precondition isn't satisfied; we choose
-    // to die with a CHECK failure.
-    CHECK(!weak_this_.expired()) << "No shared_ptr owns this object";
-    return weak_this_.lock();
-  }
-  shared_ptr<const T> shared_from_this() const {
-    CHECK(!weak_this_.expired()) << "No shared_ptr owns this object";
-    return weak_this_.lock();
-  }
-
- protected:
-  enable_shared_from_this() { }
-  enable_shared_from_this(const enable_shared_from_this& other) { }
-  enable_shared_from_this& operator=(const enable_shared_from_this& other) {
-    return *this;
-  }
-  ~enable_shared_from_this() { }
-
- private:
-  weak_ptr<T> weak_this_;
-};
-
-// This is a helper function called by shared_ptr's constructor from a raw
-// pointer. If T inherits from enable_shared_from_this<T>, it sets up
-// weak_this_ so that shared_from_this works correctly. If T does not inherit
-// from weak_this we get a different overload, defined inline, which does
-// nothing.
-template<typename T>
-void shared_ptr<T>::MaybeSetupWeakThis(enable_shared_from_this<T>* ptr) {
-  if (ptr) {
-    CHECK(ptr->weak_this_.expired()) << "Object already owned by a shared_ptr";
-    ptr->weak_this_ = *this;
-  }
-}
-
-#endif  // UTIL_GTL_USE_STD_SHARED_PTR
-
-}  // internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_STUBS_SHARED_PTR_H__
diff --git a/src/google/protobuf/stubs/singleton.h b/src/google/protobuf/stubs/singleton.h
index 9301f549..2e6ccbdb 100644
--- a/src/google/protobuf/stubs/singleton.h
+++ b/src/google/protobuf/stubs/singleton.h
@@ -30,7 +30,6 @@
 #ifndef GOOGLE_PROTOBUF_STUBS_SINGLETON_H__
 #define GOOGLE_PROTOBUF_STUBS_SINGLETON_H__
 
-#include <google/protobuf/stubs/atomicops.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/once.h>
 
diff --git a/src/google/protobuf/stubs/status.cc b/src/google/protobuf/stubs/status.cc
index dd1bd614..2bfbe0b4 100644
--- a/src/google/protobuf/stubs/status.cc
+++ b/src/google/protobuf/stubs/status.cc
@@ -124,7 +124,7 @@ string Status::ToString() const {
   }
 }
 
-ostream& operator<<(ostream& os, const Status& x) {
+std::ostream& operator<<(std::ostream& os, const Status& x) {
   os << x.ToString();
   return os;
 }
diff --git a/src/google/protobuf/stubs/status.h b/src/google/protobuf/stubs/status.h
index 614ab994..c5d38f0b 100644
--- a/src/google/protobuf/stubs/status.h
+++ b/src/google/protobuf/stubs/status.h
@@ -106,7 +106,7 @@ class LIBPROTOBUF_EXPORT Status {
 };
 
 // Prints a human-readable representation of 'x' to 'os'.
-LIBPROTOBUF_EXPORT ostream& operator<<(ostream& os, const Status& x);
+LIBPROTOBUF_EXPORT std::ostream& operator<<(std::ostream& os, const Status& x);
 
 #define EXPECT_OK(value) EXPECT_TRUE((value).ok())
 
diff --git a/src/google/protobuf/stubs/stringpiece.h b/src/google/protobuf/stubs/stringpiece.h
index 8910688b..563ff75d 100644
--- a/src/google/protobuf/stubs/stringpiece.h
+++ b/src/google/protobuf/stubs/stringpiece.h
@@ -292,7 +292,7 @@ class LIBPROTOBUF_EXPORT StringPiece {
   int compare(StringPiece x) const {
     const stringpiece_ssize_type min_size =
         length_ < x.length_ ? length_ : x.length_;
-    int r = memcmp(ptr_, x.ptr_, min_size);
+    int r = memcmp(ptr_, x.ptr_, static_cast<size_t>(min_size));
     if (r < 0) return -1;
     if (r > 0) return 1;
     if (length_ < x.length_) return -1;
@@ -310,7 +310,7 @@ class LIBPROTOBUF_EXPORT StringPiece {
   // "as_string()" method defined here for existing code.
   string ToString() const {
     if (ptr_ == NULL) return string();
-    return string(data(), size());
+    return string(data(), static_cast<size_type>(size()));
   }
 
   operator string() const {
@@ -321,12 +321,14 @@ class LIBPROTOBUF_EXPORT StringPiece {
   void AppendToString(string* target) const;
 
   bool starts_with(StringPiece x) const {
-    return (length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0);
+    return (length_ >= x.length_) &&
+           (memcmp(ptr_, x.ptr_, static_cast<size_t>(x.length_)) == 0);
   }
 
   bool ends_with(StringPiece x) const {
     return ((length_ >= x.length_) &&
-            (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
+            (memcmp(ptr_ + (length_-x.length_), x.ptr_,
+                 static_cast<size_t>(x.length_)) == 0));
   }
 
   // Checks whether StringPiece starts with x and if so advances the beginning
@@ -398,7 +400,7 @@ inline bool operator==(StringPiece x, StringPiece y) {
   }
 
   return x.data() == y.data() || len <= 0 ||
-      memcmp(x.data(), y.data(), len) == 0;
+      memcmp(x.data(), y.data(), static_cast<size_t>(len)) == 0;
 }
 
 inline bool operator!=(StringPiece x, StringPiece y) {
@@ -408,7 +410,7 @@ inline bool operator!=(StringPiece x, StringPiece y) {
 inline bool operator<(StringPiece x, StringPiece y) {
   const stringpiece_ssize_type min_size =
       x.size() < y.size() ? x.size() : y.size();
-  const int r = memcmp(x.data(), y.data(), min_size);
+  const int r = memcmp(x.data(), y.data(), static_cast<size_t>(min_size));
   return (r < 0) || (r == 0 && x.size() < y.size());
 }
 
@@ -458,7 +460,9 @@ struct StringPiecePod {
     return size_;
   }
 
-  std::string ToString() const { return std::string(data_, size_); }
+  std::string ToString() const {
+    return std::string(data_, static_cast<size_t>(size_));
+  }
  private:
   const char* data_;
   stringpiece_ssize_type size_;
@@ -473,7 +477,7 @@ template<> struct hash<StringPiece> {
   size_t operator()(const StringPiece& s) const {
     size_t result = 0;
     for (const char *str = s.data(), *end = str + s.size(); str < end; str++) {  
-      result = 5 * result + *str;
+      result = 5 * result + static_cast<size_t>(*str);
     }
     return result;
   }
diff --git a/src/google/protobuf/stubs/stringpiece_unittest.cc b/src/google/protobuf/stubs/stringpiece_unittest.cc
index a52d81f8..a6a87595 100644
--- a/src/google/protobuf/stubs/stringpiece_unittest.cc
+++ b/src/google/protobuf/stubs/stringpiece_unittest.cc
@@ -783,11 +783,13 @@ TEST(FindOneCharTest, EdgeCases) {
   EXPECT_EQ(StringPiece::npos, a.rfind('x'));
 }
 
+#ifdef PROTOBUF_HAS_DEATH_TEST
 #ifndef NDEBUG
 TEST(NonNegativeLenTest, NonNegativeLen) {
   EXPECT_DEATH(StringPiece("xyz", -1), "len >= 0");
 }
 #endif  // ndef DEBUG
+#endif  // PROTOBUF_HAS_DEATH_TEST
 
 }  // namespace
 }  // namespace protobuf
diff --git a/src/google/protobuf/stubs/stringprintf.cc b/src/google/protobuf/stubs/stringprintf.cc
index 83fdfe45..d98b9b87 100644
--- a/src/google/protobuf/stubs/stringprintf.cc
+++ b/src/google/protobuf/stubs/stringprintf.cc
@@ -137,7 +137,7 @@ const int kStringPrintfVectorMaxArgs = 32;
 // and we can fix the problem or protect against an attack.
 static const char string_printf_empty_block[256] = { '\0' };
 
-string StringPrintfVector(const char* format, const vector<string>& v) {
+string StringPrintfVector(const char* format, const std::vector<string>& v) {
   GOOGLE_CHECK_LE(v.size(), kStringPrintfVectorMaxArgs)
       << "StringPrintfVector currently only supports up to "
       << kStringPrintfVectorMaxArgs << " arguments. "
diff --git a/src/google/protobuf/stubs/stringprintf.h b/src/google/protobuf/stubs/stringprintf.h
index ab1ab558..7183ec6a 100644
--- a/src/google/protobuf/stubs/stringprintf.h
+++ b/src/google/protobuf/stubs/stringprintf.h
@@ -68,7 +68,7 @@ LIBPROTOBUF_EXPORT extern const int kStringPrintfVectorMaxArgs;
 // You can use this version when all your arguments are strings, but
 // you don't know how many arguments you'll have at compile time.
 // StringPrintfVector will LOG(FATAL) if v.size() > kStringPrintfVectorMaxArgs
-LIBPROTOBUF_EXPORT extern string StringPrintfVector(const char* format, const vector<string>& v);
+LIBPROTOBUF_EXPORT extern string StringPrintfVector(const char* format, const std::vector<string>& v);
 
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/stubs/structurally_valid.cc b/src/google/protobuf/stubs/structurally_valid.cc
index d79a6ee4..b2239682 100644
--- a/src/google/protobuf/stubs/structurally_valid.cc
+++ b/src/google/protobuf/stubs/structurally_valid.cc
@@ -1,4 +1,33 @@
-// Copyright 2005-2008 Google Inc. All Rights Reserved.
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Author: jrm@google.com (Jim Meehan)
 
 #include <google/protobuf/stubs/common.h>
diff --git a/src/google/protobuf/stubs/structurally_valid_unittest.cc b/src/google/protobuf/stubs/structurally_valid_unittest.cc
index 90888885..eec07a87 100644
--- a/src/google/protobuf/stubs/structurally_valid_unittest.cc
+++ b/src/google/protobuf/stubs/structurally_valid_unittest.cc
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Copyright 2008 Google Inc. All Rights Reserved.
 // Author: xpeng@google.com (Peter Peng)
 
diff --git a/src/google/protobuf/stubs/strutil.cc b/src/google/protobuf/stubs/strutil.cc
index 15b6e53f..552d416f 100644
--- a/src/google/protobuf/stubs/strutil.cc
+++ b/src/google/protobuf/stubs/strutil.cc
@@ -226,8 +226,8 @@ void SplitStringToIteratorUsing(const string& full,
 
 void SplitStringUsing(const string& full,
                       const char* delim,
-                      vector<string>* result) {
-  back_insert_iterator< vector<string> > it(*result);
+                      std::vector<string>* result) {
+  std::back_insert_iterator< std::vector<string> > it(*result);
   SplitStringToIteratorUsing(full, delim, it);
 }
 
@@ -264,8 +264,8 @@ void SplitStringToIteratorAllowEmpty(const StringType& full,
 }
 
 void SplitStringAllowEmpty(const string& full, const char* delim,
-                           vector<string>* result) {
-  back_insert_iterator<vector<string> > it(*result);
+                           std::vector<string>* result) {
+  std::back_insert_iterator<std::vector<string> > it(*result);
   SplitStringToIteratorAllowEmpty(full, delim, 0, it);
 }
 
@@ -303,7 +303,7 @@ static void JoinStringsIterator(const ITERATOR& start,
   }
 }
 
-void JoinStrings(const vector<string>& components,
+void JoinStrings(const std::vector<string>& components,
                  const char* delim,
                  string * result) {
   JoinStringsIterator(components.begin(), components.end(), delim, result);
@@ -332,7 +332,7 @@ int UnescapeCEscapeSequences(const char* source, char* dest) {
 }
 
 int UnescapeCEscapeSequences(const char* source, char* dest,
-                             vector<string> *errors) {
+                             std::vector<string> *errors) {
   GOOGLE_DCHECK(errors == NULL) << "Error reporting not implemented.";
 
   char* d = dest;
@@ -468,8 +468,8 @@ int UnescapeCEscapeString(const string& src, string* dest) {
 }
 
 int UnescapeCEscapeString(const string& src, string* dest,
-                          vector<string> *errors) {
-  scoped_array<char> unescaped(new char[src.size() + 1]);
+                          std::vector<string> *errors) {
+  std::unique_ptr<char[]> unescaped(new char[src.size() + 1]);
   int len = UnescapeCEscapeSequences(src.c_str(), unescaped.get(), errors);
   GOOGLE_CHECK(dest);
   dest->assign(unescaped.get(), len);
@@ -477,7 +477,7 @@ int UnescapeCEscapeString(const string& src, string* dest,
 }
 
 string UnescapeCEscapeString(const string& src) {
-  scoped_array<char> unescaped(new char[src.size() + 1]);
+  std::unique_ptr<char[]> unescaped(new char[src.size() + 1]);
   int len = UnescapeCEscapeSequences(src.c_str(), unescaped.get(), NULL);
   return string(unescaped.get(), len);
 }
@@ -620,7 +620,7 @@ namespace strings {
 
 string Utf8SafeCEscape(const string& src) {
   const int dest_length = src.size() * 4 + 1; // Maximum possible expansion
-  scoped_array<char> dest(new char[dest_length]);
+  std::unique_ptr<char[]> dest(new char[dest_length]);
   const int len = CEscapeInternal(src.data(), src.size(),
                                   dest.get(), dest_length, false, true);
   GOOGLE_DCHECK_GE(len, 0);
@@ -629,7 +629,7 @@ string Utf8SafeCEscape(const string& src) {
 
 string CHexEscape(const string& src) {
   const int dest_length = src.size() * 4 + 1; // Maximum possible expansion
-  scoped_array<char> dest(new char[dest_length]);
+  std::unique_ptr<char[]> dest(new char[dest_length]);
   const int len = CEscapeInternal(src.data(), src.size(),
                                   dest.get(), dest_length, true, false);
   GOOGLE_DCHECK_GE(len, 0);
@@ -1262,10 +1262,10 @@ char* DoubleToBuffer(double value, char* buffer) {
   // this assert.
   GOOGLE_COMPILE_ASSERT(DBL_DIG < 20, DBL_DIG_is_too_big);
 
-  if (value == numeric_limits<double>::infinity()) {
+  if (value == std::numeric_limits<double>::infinity()) {
     strcpy(buffer, "inf");
     return buffer;
-  } else if (value == -numeric_limits<double>::infinity()) {
+  } else if (value == -std::numeric_limits<double>::infinity()) {
     strcpy(buffer, "-inf");
     return buffer;
   } else if (MathLimits<double>::IsNaN(value)) {
@@ -1380,10 +1380,10 @@ char* FloatToBuffer(float value, char* buffer) {
   // this assert.
   GOOGLE_COMPILE_ASSERT(FLT_DIG < 10, FLT_DIG_is_too_big);
 
-  if (value == numeric_limits<double>::infinity()) {
+  if (value == std::numeric_limits<double>::infinity()) {
     strcpy(buffer, "inf");
     return buffer;
-  } else if (value == -numeric_limits<double>::infinity()) {
+  } else if (value == -std::numeric_limits<double>::infinity()) {
     strcpy(buffer, "-inf");
     return buffer;
   } else if (MathLimits<float>::IsNaN(value)) {
@@ -1401,7 +1401,7 @@ char* FloatToBuffer(float value, char* buffer) {
   float parsed_value;
   if (!safe_strtof(buffer, &parsed_value) || parsed_value != value) {
     int snprintf_result =
-      snprintf(buffer, kFloatToBufferSize, "%.*g", FLT_DIG+2, value);
+      snprintf(buffer, kFloatToBufferSize, "%.*g", FLT_DIG+3, value);
 
     // Should never overflow; see above.
     GOOGLE_DCHECK(snprintf_result > 0 && snprintf_result < kFloatToBufferSize);
diff --git a/src/google/protobuf/stubs/strutil.h b/src/google/protobuf/stubs/strutil.h
index df28c94d..a839b8b3 100644
--- a/src/google/protobuf/stubs/strutil.h
+++ b/src/google/protobuf/stubs/strutil.h
@@ -213,7 +213,7 @@ LIBPROTOBUF_EXPORT string StringReplace(const string& s, const string& oldsub,
 //    over all of them.
 // ----------------------------------------------------------------------
 LIBPROTOBUF_EXPORT void SplitStringUsing(const string& full, const char* delim,
-                                         vector<string>* res);
+                                         std::vector<string>* res);
 
 // Split a string using one or more byte delimiters, presented
 // as a nul-terminated c string. Append the components to 'result'.
@@ -225,15 +225,15 @@ LIBPROTOBUF_EXPORT void SplitStringUsing(const string& full, const char* delim,
 // ----------------------------------------------------------------------
 LIBPROTOBUF_EXPORT void SplitStringAllowEmpty(const string& full,
                                               const char* delim,
-                                              vector<string>* result);
+                                              std::vector<string>* result);
 
 // ----------------------------------------------------------------------
 // Split()
 //    Split a string using a character delimiter.
 // ----------------------------------------------------------------------
-inline vector<string> Split(
+inline std::vector<string> Split(
     const string& full, const char* delim, bool skip_empty = true) {
-  vector<string> result;
+  std::vector<string> result;
   if (skip_empty) {
     SplitStringUsing(full, delim, &result);
   } else {
@@ -250,10 +250,10 @@ inline vector<string> Split(
 //    another takes a pointer to the target string. In the latter case the
 //    target string is cleared and overwritten.
 // ----------------------------------------------------------------------
-LIBPROTOBUF_EXPORT void JoinStrings(const vector<string>& components,
+LIBPROTOBUF_EXPORT void JoinStrings(const std::vector<string>& components,
                                     const char* delim, string* result);
 
-inline string JoinStrings(const vector<string>& components,
+inline string JoinStrings(const std::vector<string>& components,
                           const char* delim) {
   string result;
   JoinStrings(components, delim, &result);
@@ -285,15 +285,15 @@ inline string JoinStrings(const vector<string>& components,
 //
 //    Errors: In the first form of the call, errors are reported with
 //    LOG(ERROR). The same is true for the second form of the call if
-//    the pointer to the string vector is NULL; otherwise, error
-//    messages are stored in the vector. In either case, the effect on
+//    the pointer to the string std::vector is NULL; otherwise, error
+//    messages are stored in the std::vector. In either case, the effect on
 //    the dest array is not defined, but rest of the source will be
 //    processed.
 //    ----------------------------------------------------------------------
 
 LIBPROTOBUF_EXPORT int UnescapeCEscapeSequences(const char* source, char* dest);
 LIBPROTOBUF_EXPORT int UnescapeCEscapeSequences(const char* source, char* dest,
-                                                vector<string> *errors);
+                                                std::vector<string> *errors);
 
 // ----------------------------------------------------------------------
 // UnescapeCEscapeString()
@@ -312,7 +312,7 @@ LIBPROTOBUF_EXPORT int UnescapeCEscapeSequences(const char* source, char* dest,
 
 LIBPROTOBUF_EXPORT int UnescapeCEscapeString(const string& src, string* dest);
 LIBPROTOBUF_EXPORT int UnescapeCEscapeString(const string& src, string* dest,
-                                             vector<string> *errors);
+                                             std::vector<string> *errors);
 LIBPROTOBUF_EXPORT string UnescapeCEscapeString(const string& src);
 
 // ----------------------------------------------------------------------
diff --git a/src/google/protobuf/stubs/strutil_unittest.cc b/src/google/protobuf/stubs/strutil_unittest.cc
index 5d62fc4a..6bf0f598 100644
--- a/src/google/protobuf/stubs/strutil_unittest.cc
+++ b/src/google/protobuf/stubs/strutil_unittest.cc
@@ -782,7 +782,7 @@ TEST(Base64, EscapeAndUnescape) {
       reinterpret_cast<const unsigned char*>(base64_strings[i].plaintext);
     int plain_length = strlen(base64_strings[i].plaintext);
     int cypher_length = strlen(base64_strings[i].cyphertext);
-    vector<char> buffer(cypher_length+1);
+    std::vector<char> buffer(cypher_length+1);
     int encode_length = WebSafeBase64Escape(unsigned_plaintext,
                                                      plain_length,
                                                      &buffer[0],
diff --git a/src/google/protobuf/stubs/time.cc b/src/google/protobuf/stubs/time.cc
index 49c0412c..6def637e 100644
--- a/src/google/protobuf/stubs/time.cc
+++ b/src/google/protobuf/stubs/time.cc
@@ -80,9 +80,9 @@ bool ValidateDateTime(const DateTime& time) {
     return false;
   }
   if (time.month == 2 && IsLeapYear(time.year)) {
-    return time.month <= kDaysInMonth[time.month] + 1;
+    return time.day <= kDaysInMonth[time.month] + 1;
   } else {
-    return time.month <= kDaysInMonth[time.month];
+    return time.day <= kDaysInMonth[time.month];
   }
 }
 
diff --git a/src/google/protobuf/stubs/time_test.cc b/src/google/protobuf/stubs/time_test.cc
index 59e9d1c7..53da9480 100644
--- a/src/google/protobuf/stubs/time_test.cc
+++ b/src/google/protobuf/stubs/time_test.cc
@@ -149,6 +149,59 @@ TEST(DateTimeTest, LeapYear) {
             CreateTimestamp(2400, 3, 1) - CreateTimestamp(2400, 2, 29));
 }
 
+TEST(DateTimeTest, WrongDays) {
+  int64 seconds;
+  DateTime time;
+  time.hour = 0;
+  time.minute = 0;
+  time.second = 0;
+  time.month = 2;
+
+  // Non-leap year.
+  time.year = 2015;
+  time.day = 29;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+
+  // Leap year.
+  time.year = 2016;
+  time.day = 29;
+  ASSERT_TRUE(DateTimeToSeconds(time, &seconds));
+  time.day = 30;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+
+  // Non-leap year.
+  time.year = 2100;
+  time.day = 29;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+
+  // Leap year.
+  time.year = 2400;
+  time.day = 29;
+  ASSERT_TRUE(DateTimeToSeconds(time, &seconds));
+  time.day = 30;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+
+  // Non-february
+  time.year = 2015;
+  time.month = 1;
+  time.day = 0;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+  time.day = 1;
+  ASSERT_TRUE(DateTimeToSeconds(time, &seconds));
+  time.day = 31;
+  ASSERT_TRUE(DateTimeToSeconds(time, &seconds));
+  time.day = 32;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+
+  // Bad month
+  time.year = 2015;
+  time.month = 0;
+  time.day = 1;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+  time.month = 13;
+  ASSERT_FALSE(DateTimeToSeconds(time, &seconds));
+}
+  
 TEST(DateTimeTest, StringFormat) {
   DateTime start, end;
   start.year = 1;
diff --git a/src/google/protobuf/stubs/type_traits.h b/src/google/protobuf/stubs/type_traits.h
deleted file mode 100644
index 3ab5ea7d..00000000
--- a/src/google/protobuf/stubs/type_traits.h
+++ /dev/null
@@ -1,364 +0,0 @@
-// Copyright (c) 2006, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// ----
-// Author: Matt Austern
-//
-// This code is compiled directly on many platforms, including client
-// platforms like Windows, Mac, and embedded systems.  Before making
-// any changes here, make sure that you're not breaking any platforms.
-//
-// Define a small subset of tr1 type traits. The traits we define are:
-//   enable_if
-//   is_integral
-//   is_floating_point
-//   is_pointer
-//   is_enum
-//   is_reference
-//   is_pod
-//   has_trivial_constructor
-//   has_trivial_copy
-//   has_trivial_assign
-//   has_trivial_destructor
-//   remove_const
-//   remove_volatile
-//   remove_cv
-//   remove_reference
-//   add_reference
-//   remove_pointer
-//   is_same
-//   is_convertible
-// We can add more type traits as required.
-
-#ifndef GOOGLE_PROTOBUF_TYPE_TRAITS_H_
-#define GOOGLE_PROTOBUF_TYPE_TRAITS_H_
-
-#include <cstddef>                  // for NULL
-#include <utility>                  // For pair
-
-#include <google/protobuf/stubs/template_util.h>  // For true_type and false_type
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-template<typename B, typename D>
-struct is_base_of {
-  typedef char (&yes)[1];
-  typedef char (&no)[2];
-
-  // BEGIN GOOGLE LOCAL MODIFICATION -- check is a #define on Mac.
-  #undef check
-  // END GOOGLE LOCAL MODIFICATION
-
-  static yes check(const B*);
-  static no check(const void*);
-
-  enum {
-    value = sizeof(check(static_cast<const D*>(NULL))) == sizeof(yes),
-  };
-};
-
-template <bool cond, class T = void> struct enable_if;
-template <class T> struct is_integral;
-template <class T> struct is_floating_point;
-template <class T> struct is_pointer;
-// MSVC can't compile this correctly, and neither can gcc 3.3.5 (at least)
-#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
-// is_enum uses is_convertible, which is not available on MSVC.
-template <class T> struct is_enum;
-#endif
-template <class T> struct is_reference;
-template <class T> struct is_pod;
-template <class T> struct has_trivial_constructor;
-template <class T> struct has_trivial_copy;
-template <class T> struct has_trivial_assign;
-template <class T> struct has_trivial_destructor;
-template <class T> struct remove_const;
-template <class T> struct remove_volatile;
-template <class T> struct remove_cv;
-template <class T> struct remove_reference;
-template <class T> struct add_reference;
-template <class T> struct remove_pointer;
-template <class T, class U> struct is_same;
-#if !(defined(__GNUC__) && __GNUC__ <= 3)
-template <class From, class To> struct is_convertible;
-#endif
-
-// enable_if, equivalent semantics to c++11 std::enable_if, specifically:
-//   "If B is true, the member typedef type shall equal T; otherwise, there
-//    shall be no member typedef type."
-// Specified by 20.9.7.6 [Other transformations]
-
-template<bool cond, class T> struct enable_if { typedef T type; };
-template<class T> struct enable_if<false, T> {};
-// is_integral is false except for the built-in integer types. A
-// cv-qualified type is integral if and only if the underlying type is.
-template <class T> struct is_integral : false_type { };
-template<> struct is_integral<bool> : true_type { };
-template<> struct is_integral<char> : true_type { };
-template<> struct is_integral<unsigned char> : true_type { };
-template<> struct is_integral<signed char> : true_type { };
-#if defined(_MSC_VER)
-// wchar_t is not by default a distinct type from unsigned short in
-// Microsoft C.
-// See http://msdn2.microsoft.com/en-us/library/dh8che7s(VS.80).aspx
-template<> struct is_integral<__wchar_t> : true_type { };
-#else
-template<> struct is_integral<wchar_t> : true_type { };
-#endif
-template<> struct is_integral<short> : true_type { };
-template<> struct is_integral<unsigned short> : true_type { };
-template<> struct is_integral<int> : true_type { };
-template<> struct is_integral<unsigned int> : true_type { };
-template<> struct is_integral<long> : true_type { };
-template<> struct is_integral<unsigned long> : true_type { };
-#if defined(HAVE_LONG_LONG) || defined(_MSC_VER)
-template<> struct is_integral<long long> : true_type { };
-template<> struct is_integral<unsigned long long> : true_type { };
-#endif
-template <class T> struct is_integral<const T> : is_integral<T> { };
-template <class T> struct is_integral<volatile T> : is_integral<T> { };
-template <class T> struct is_integral<const volatile T> : is_integral<T> { };
-
-// is_floating_point is false except for the built-in floating-point types.
-// A cv-qualified type is integral if and only if the underlying type is.
-template <class T> struct is_floating_point : false_type { };
-template<> struct is_floating_point<float> : true_type { };
-template<> struct is_floating_point<double> : true_type { };
-template<> struct is_floating_point<long double> : true_type { };
-template <class T> struct is_floating_point<const T>
-    : is_floating_point<T> { };
-template <class T> struct is_floating_point<volatile T>
-    : is_floating_point<T> { };
-template <class T> struct is_floating_point<const volatile T>
-    : is_floating_point<T> { };
-
-// is_pointer is false except for pointer types. A cv-qualified type (e.g.
-// "int* const", as opposed to "int const*") is cv-qualified if and only if
-// the underlying type is.
-template <class T> struct is_pointer : false_type { };
-template <class T> struct is_pointer<T*> : true_type { };
-template <class T> struct is_pointer<const T> : is_pointer<T> { };
-template <class T> struct is_pointer<volatile T> : is_pointer<T> { };
-template <class T> struct is_pointer<const volatile T> : is_pointer<T> { };
-
-#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
-
-namespace type_traits_internal {
-
-template <class T> struct is_class_or_union {
-  template <class U> static small_ tester(void (U::*)());
-  template <class U> static big_ tester(...);
-  static const bool value = sizeof(tester<T>(0)) == sizeof(small_);
-};
-
-// is_convertible chokes if the first argument is an array. That's why
-// we use add_reference here.
-template <bool NotUnum, class T> struct is_enum_impl
-    : is_convertible<typename add_reference<T>::type, int> { };
-
-template <class T> struct is_enum_impl<true, T> : false_type { };
-
-}  // namespace type_traits_internal
-
-// Specified by TR1 [4.5.1] primary type categories.
-
-// Implementation note:
-//
-// Each type is either void, integral, floating point, array, pointer,
-// reference, member object pointer, member function pointer, enum,
-// union or class. Out of these, only integral, floating point, reference,
-// class and enum types are potentially convertible to int. Therefore,
-// if a type is not a reference, integral, floating point or class and
-// is convertible to int, it's a enum. Adding cv-qualification to a type
-// does not change whether it's an enum.
-//
-// Is-convertible-to-int check is done only if all other checks pass,
-// because it can't be used with some types (e.g. void or classes with
-// inaccessible conversion operators).
-template <class T> struct is_enum
-    : type_traits_internal::is_enum_impl<
-          is_same<T, void>::value ||
-              is_integral<T>::value ||
-              is_floating_point<T>::value ||
-              is_reference<T>::value ||
-              type_traits_internal::is_class_or_union<T>::value,
-          T> { };
-
-template <class T> struct is_enum<const T> : is_enum<T> { };
-template <class T> struct is_enum<volatile T> : is_enum<T> { };
-template <class T> struct is_enum<const volatile T> : is_enum<T> { };
-
-#endif
-
-// is_reference is false except for reference types.
-template<typename T> struct is_reference : false_type {};
-template<typename T> struct is_reference<T&> : true_type {};
-
-
-// We can't get is_pod right without compiler help, so fail conservatively.
-// We will assume it's false except for arithmetic types, enumerations,
-// pointers and cv-qualified versions thereof. Note that std::pair<T,U>
-// is not a POD even if T and U are PODs.
-template <class T> struct is_pod
- : integral_constant<bool, (is_integral<T>::value ||
-                            is_floating_point<T>::value ||
-#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
-                            // is_enum is not available on MSVC.
-                            is_enum<T>::value ||
-#endif
-                            is_pointer<T>::value)> { };
-template <class T> struct is_pod<const T> : is_pod<T> { };
-template <class T> struct is_pod<volatile T> : is_pod<T> { };
-template <class T> struct is_pod<const volatile T> : is_pod<T> { };
-
-
-// We can't get has_trivial_constructor right without compiler help, so
-// fail conservatively. We will assume it's false except for: (1) types
-// for which is_pod is true. (2) std::pair of types with trivial
-// constructors. (3) array of a type with a trivial constructor.
-// (4) const versions thereof.
-template <class T> struct has_trivial_constructor : is_pod<T> { };
-template <class T, class U> struct has_trivial_constructor<std::pair<T, U> >
-  : integral_constant<bool,
-                      (has_trivial_constructor<T>::value &&
-                       has_trivial_constructor<U>::value)> { };
-template <class A, int N> struct has_trivial_constructor<A[N]>
-  : has_trivial_constructor<A> { };
-template <class T> struct has_trivial_constructor<const T>
-  : has_trivial_constructor<T> { };
-
-// We can't get has_trivial_copy right without compiler help, so fail
-// conservatively. We will assume it's false except for: (1) types
-// for which is_pod is true. (2) std::pair of types with trivial copy
-// constructors. (3) array of a type with a trivial copy constructor.
-// (4) const versions thereof.
-template <class T> struct has_trivial_copy : is_pod<T> { };
-template <class T, class U> struct has_trivial_copy<std::pair<T, U> >
-  : integral_constant<bool,
-                      (has_trivial_copy<T>::value &&
-                       has_trivial_copy<U>::value)> { };
-template <class A, int N> struct has_trivial_copy<A[N]>
-  : has_trivial_copy<A> { };
-template <class T> struct has_trivial_copy<const T> : has_trivial_copy<T> { };
-
-// We can't get has_trivial_assign right without compiler help, so fail
-// conservatively. We will assume it's false except for: (1) types
-// for which is_pod is true. (2) std::pair of types with trivial copy
-// constructors. (3) array of a type with a trivial assign constructor.
-template <class T> struct has_trivial_assign : is_pod<T> { };
-template <class T, class U> struct has_trivial_assign<std::pair<T, U> >
-  : integral_constant<bool,
-                      (has_trivial_assign<T>::value &&
-                       has_trivial_assign<U>::value)> { };
-template <class A, int N> struct has_trivial_assign<A[N]>
-  : has_trivial_assign<A> { };
-
-// We can't get has_trivial_destructor right without compiler help, so
-// fail conservatively. We will assume it's false except for: (1) types
-// for which is_pod is true. (2) std::pair of types with trivial
-// destructors. (3) array of a type with a trivial destructor.
-// (4) const versions thereof.
-template <class T> struct has_trivial_destructor : is_pod<T> { };
-template <class T, class U> struct has_trivial_destructor<std::pair<T, U> >
-  : integral_constant<bool,
-                      (has_trivial_destructor<T>::value &&
-                       has_trivial_destructor<U>::value)> { };
-template <class A, int N> struct has_trivial_destructor<A[N]>
-  : has_trivial_destructor<A> { };
-template <class T> struct has_trivial_destructor<const T>
-  : has_trivial_destructor<T> { };
-
-// Specified by TR1 [4.7.1]
-template<typename T> struct remove_const { typedef T type; };
-template<typename T> struct remove_const<T const> { typedef T type; };
-template<typename T> struct remove_volatile { typedef T type; };
-template<typename T> struct remove_volatile<T volatile> { typedef T type; };
-template<typename T> struct remove_cv {
-  typedef typename remove_const<typename remove_volatile<T>::type>::type type;
-};
-
-
-// Specified by TR1 [4.7.2] Reference modifications.
-template<typename T> struct remove_reference { typedef T type; };
-template<typename T> struct remove_reference<T&> { typedef T type; };
-
-template <typename T> struct add_reference { typedef T& type; };
-template <typename T> struct add_reference<T&> { typedef T& type; };
-
-// Specified by TR1 [4.7.4] Pointer modifications.
-template<typename T> struct remove_pointer { typedef T type; };
-template<typename T> struct remove_pointer<T*> { typedef T type; };
-template<typename T> struct remove_pointer<T* const> { typedef T type; };
-template<typename T> struct remove_pointer<T* volatile> { typedef T type; };
-template<typename T> struct remove_pointer<T* const volatile> {
-  typedef T type; };
-
-// Specified by TR1 [4.6] Relationships between types
-template<typename T, typename U> struct is_same : public false_type { };
-template<typename T> struct is_same<T, T> : public true_type { };
-
-// Specified by TR1 [4.6] Relationships between types
-#if !(defined(__GNUC__) && __GNUC__ <= 3)
-namespace type_traits_internal {
-
-// This class is an implementation detail for is_convertible, and you
-// don't need to know how it works to use is_convertible. For those
-// who care: we declare two different functions, one whose argument is
-// of type To and one with a variadic argument list. We give them
-// return types of different size, so we can use sizeof to trick the
-// compiler into telling us which function it would have chosen if we
-// had called it with an argument of type From.  See Alexandrescu's
-// _Modern C++ Design_ for more details on this sort of trick.
-
-template <typename From, typename To>
-struct ConvertHelper {
-  static small_ Test(To);
-  static big_ Test(...);
-  static From Create();
-  enum {
-    value = sizeof(Test(Create())) == sizeof(small_)
-  };
-};
-}  // namespace type_traits_internal
-
-// Inherits from true_type if From is convertible to To, false_type otherwise.
-template <typename From, typename To>
-struct is_convertible
-    : integral_constant<bool,
-                        type_traits_internal::ConvertHelper<From, To>::value> {
-};
-#endif
-
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_TYPE_TRAITS_H_
diff --git a/src/google/protobuf/stubs/type_traits_unittest.cc b/src/google/protobuf/stubs/type_traits_unittest.cc
deleted file mode 100644
index 49c10ace..00000000
--- a/src/google/protobuf/stubs/type_traits_unittest.cc
+++ /dev/null
@@ -1,631 +0,0 @@
-// Copyright (c) 2006, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// ----
-// Author: Matt Austern
-
-#include <google/protobuf/stubs/type_traits.h>
-
-#include <stdlib.h>   // for exit()
-#include <stdio.h>
-#include <string>
-#include <vector>
-
-#include <google/protobuf/testing/googletest.h>
-#include <gtest/gtest.h>
-
-typedef int int32;
-// IBM AIX typedefs `int64` in `sys/inttypes.h`, included transitively above.
-#ifndef _AIX
-typedef long int64;
-#endif
-
-using std::string;
-using std::vector;
-using std::pair;
-
-
-// This assertion produces errors like "error: invalid use of
-// incomplete type 'struct <unnamed>::AssertTypesEq<const int, int>'"
-// when it fails.
-template<typename T, typename U> struct AssertTypesEq;
-template<typename T> struct AssertTypesEq<T, T> {};
-#define COMPILE_ASSERT_TYPES_EQ(T, U) static_cast<void>(AssertTypesEq<T, U>())
-
-// A user-defined POD type.
-struct A {
-  int n_;
-};
-
-// A user-defined non-POD type with a trivial copy constructor.
-class B {
- public:
-  explicit B(int n) : n_(n) { }
- private:
-  int n_;
-};
-
-// Another user-defined non-POD type with a trivial copy constructor.
-// We will explicitly declare C to have a trivial copy constructor
-// by specializing has_trivial_copy.
-class C {
- public:
-  explicit C(int n) : n_(n) { }
- private:
-  int n_;
-};
-
-namespace google {
-namespace protobuf {
-namespace internal {
-template<> struct has_trivial_copy<C> : true_type { };
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-// Another user-defined non-POD type with a trivial assignment operator.
-// We will explicitly declare C to have a trivial assignment operator
-// by specializing has_trivial_assign.
-class D {
- public:
-  explicit D(int n) : n_(n) { }
- private:
-  int n_;
-};
-
-namespace google {
-namespace protobuf {
-namespace internal {
-template<> struct has_trivial_assign<D> : true_type { };
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-// Another user-defined non-POD type with a trivial constructor.
-// We will explicitly declare E to have a trivial constructor
-// by specializing has_trivial_constructor.
-class E {
- public:
-  int n_;
-};
-
-namespace google {
-namespace protobuf {
-namespace internal {
-template<> struct has_trivial_constructor<E> : true_type { };
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-// Another user-defined non-POD type with a trivial destructor.
-// We will explicitly declare E to have a trivial destructor
-// by specializing has_trivial_destructor.
-class F {
- public:
-  explicit F(int n) : n_(n) { }
- private:
-  int n_;
-};
-
-namespace google {
-namespace protobuf {
-namespace internal {
-template<> struct has_trivial_destructor<F> : true_type { };
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
-
-enum G {};
-
-union H {};
-
-class I {
- public:
-  operator int() const;
-};
-
-class J {
- private:
-  operator int() const;
-};
-
-namespace google {
-namespace protobuf {
-namespace internal {
-namespace {
-
-// A base class and a derived class that inherits from it, used for
-// testing conversion type traits.
-class Base {
- public:
-  virtual ~Base() { }
-};
-
-class Derived : public Base {
-};
-
-TEST(TypeTraitsTest, TestIsInteger) {
-  // Verify that is_integral is true for all integer types.
-  EXPECT_TRUE(is_integral<bool>::value);
-  EXPECT_TRUE(is_integral<char>::value);
-  EXPECT_TRUE(is_integral<unsigned char>::value);
-  EXPECT_TRUE(is_integral<signed char>::value);
-  EXPECT_TRUE(is_integral<wchar_t>::value);
-  EXPECT_TRUE(is_integral<int>::value);
-  EXPECT_TRUE(is_integral<unsigned int>::value);
-  EXPECT_TRUE(is_integral<short>::value);
-  EXPECT_TRUE(is_integral<unsigned short>::value);
-  EXPECT_TRUE(is_integral<long>::value);
-  EXPECT_TRUE(is_integral<unsigned long>::value);
-
-  // Verify that is_integral is false for a few non-integer types.
-  EXPECT_FALSE(is_integral<void>::value);
-  EXPECT_FALSE(is_integral<float>::value);
-  EXPECT_FALSE(is_integral<string>::value);
-  EXPECT_FALSE(is_integral<int*>::value);
-  EXPECT_FALSE(is_integral<A>::value);
-  EXPECT_FALSE((is_integral<pair<int, int> >::value));
-
-  // Verify that cv-qualified integral types are still integral, and
-  // cv-qualified non-integral types are still non-integral.
-  EXPECT_TRUE(is_integral<const char>::value);
-  EXPECT_TRUE(is_integral<volatile bool>::value);
-  EXPECT_TRUE(is_integral<const volatile unsigned int>::value);
-  EXPECT_FALSE(is_integral<const float>::value);
-  EXPECT_FALSE(is_integral<int* volatile>::value);
-  EXPECT_FALSE(is_integral<const volatile string>::value);
-}
-
-TEST(TypeTraitsTest, TestIsFloating) {
-  // Verify that is_floating_point is true for all floating-point types.
-  EXPECT_TRUE(is_floating_point<float>::value);
-  EXPECT_TRUE(is_floating_point<double>::value);
-  EXPECT_TRUE(is_floating_point<long double>::value);
-
-  // Verify that is_floating_point is false for a few non-float types.
-  EXPECT_FALSE(is_floating_point<void>::value);
-  EXPECT_FALSE(is_floating_point<long>::value);
-  EXPECT_FALSE(is_floating_point<string>::value);
-  EXPECT_FALSE(is_floating_point<float*>::value);
-  EXPECT_FALSE(is_floating_point<A>::value);
-  EXPECT_FALSE((is_floating_point<pair<int, int> >::value));
-
-  // Verify that cv-qualified floating point types are still floating, and
-  // cv-qualified non-floating types are still non-floating.
-  EXPECT_TRUE(is_floating_point<const float>::value);
-  EXPECT_TRUE(is_floating_point<volatile double>::value);
-  EXPECT_TRUE(is_floating_point<const volatile long double>::value);
-  EXPECT_FALSE(is_floating_point<const int>::value);
-  EXPECT_FALSE(is_floating_point<volatile string>::value);
-  EXPECT_FALSE(is_floating_point<const volatile char>::value);
-}
-
-TEST(TypeTraitsTest, TestIsPointer) {
-  // Verify that is_pointer is true for some pointer types.
-  EXPECT_TRUE(is_pointer<int*>::value);
-  EXPECT_TRUE(is_pointer<void*>::value);
-  EXPECT_TRUE(is_pointer<string*>::value);
-  EXPECT_TRUE(is_pointer<const void*>::value);
-  EXPECT_TRUE(is_pointer<volatile float* const*>::value);
-
-  // Verify that is_pointer is false for some non-pointer types.
-  EXPECT_FALSE(is_pointer<void>::value);
-  EXPECT_FALSE(is_pointer<float&>::value);
-  EXPECT_FALSE(is_pointer<long>::value);
-  EXPECT_FALSE(is_pointer<vector<int*> >::value);
-  EXPECT_FALSE(is_pointer<int[5]>::value);
-
-  // A function pointer is a pointer, but a function type, or a function
-  // reference type, is not.
-  EXPECT_TRUE(is_pointer<int (*)(int x)>::value);
-  EXPECT_FALSE(is_pointer<void(char x)>::value);
-  EXPECT_FALSE(is_pointer<double (&)(string x)>::value);
-
-  // Verify that is_pointer<T> is true for some cv-qualified pointer types,
-  // and false for some cv-qualified non-pointer types.
-  EXPECT_TRUE(is_pointer<int* const>::value);
-  EXPECT_TRUE(is_pointer<const void* volatile>::value);
-  EXPECT_TRUE(is_pointer<char** const volatile>::value);
-  EXPECT_FALSE(is_pointer<const int>::value);
-  EXPECT_FALSE(is_pointer<volatile vector<int*> >::value);
-  EXPECT_FALSE(is_pointer<const volatile double>::value);
-}
-
-TEST(TypeTraitsTest, TestIsEnum) {
-// is_enum isn't supported on MSVC or gcc 3.x
-#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
-  // Verify that is_enum is true for enum types.
-  EXPECT_TRUE(is_enum<G>::value);
-  EXPECT_TRUE(is_enum<const G>::value);
-  EXPECT_TRUE(is_enum<volatile G>::value);
-  EXPECT_TRUE(is_enum<const volatile G>::value);
-
-  // Verify that is_enum is false for a few non-enum types.
-  EXPECT_FALSE(is_enum<void>::value);
-  EXPECT_FALSE(is_enum<G&>::value);
-  EXPECT_FALSE(is_enum<G[1]>::value);
-  EXPECT_FALSE(is_enum<const G[1]>::value);
-  EXPECT_FALSE(is_enum<G[]>::value);
-  EXPECT_FALSE(is_enum<int>::value);
-  EXPECT_FALSE(is_enum<float>::value);
-  EXPECT_FALSE(is_enum<A>::value);
-  EXPECT_FALSE(is_enum<A*>::value);
-  EXPECT_FALSE(is_enum<const A>::value);
-  EXPECT_FALSE(is_enum<H>::value);
-  EXPECT_FALSE(is_enum<I>::value);
-  EXPECT_FALSE(is_enum<J>::value);
-  EXPECT_FALSE(is_enum<void()>::value);
-  EXPECT_FALSE(is_enum<void(*)()>::value);
-  EXPECT_FALSE(is_enum<int A::*>::value);
-  EXPECT_FALSE(is_enum<void (A::*)()>::value);
-#endif
-}
-
-TEST(TypeTraitsTest, TestIsReference) {
-  // Verifies that is_reference is true for all reference types.
-  typedef float& RefFloat;
-  EXPECT_TRUE(is_reference<float&>::value);
-  EXPECT_TRUE(is_reference<const int&>::value);
-  EXPECT_TRUE(is_reference<const int*&>::value);
-  EXPECT_TRUE(is_reference<int (&)(bool)>::value);
-  EXPECT_TRUE(is_reference<RefFloat>::value);
-  EXPECT_TRUE(is_reference<const RefFloat>::value);
-  EXPECT_TRUE(is_reference<volatile RefFloat>::value);
-  EXPECT_TRUE(is_reference<const volatile RefFloat>::value);
-
-
-  // Verifies that is_reference is false for all non-reference types.
-  EXPECT_FALSE(is_reference<float>::value);
-  EXPECT_FALSE(is_reference<const float>::value);
-  EXPECT_FALSE(is_reference<volatile float>::value);
-  EXPECT_FALSE(is_reference<const volatile float>::value);
-  EXPECT_FALSE(is_reference<const int*>::value);
-  EXPECT_FALSE(is_reference<int()>::value);
-  EXPECT_FALSE(is_reference<void(*)(const char&)>::value);
-}
-
-TEST(TypeTraitsTest, TestAddReference) {
-  COMPILE_ASSERT_TYPES_EQ(int&, add_reference<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(const int&, add_reference<const int>::type);
-  COMPILE_ASSERT_TYPES_EQ(volatile int&,
-                          add_reference<volatile int>::type);
-  COMPILE_ASSERT_TYPES_EQ(const volatile int&,
-                          add_reference<const volatile int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int&, add_reference<int&>::type);
-  COMPILE_ASSERT_TYPES_EQ(const int&, add_reference<const int&>::type);
-  COMPILE_ASSERT_TYPES_EQ(volatile int&,
-                          add_reference<volatile int&>::type);
-  COMPILE_ASSERT_TYPES_EQ(const volatile int&,
-                          add_reference<const volatile int&>::type);
-}
-
-TEST(TypeTraitsTest, TestIsPod) {
-  // Verify that arithmetic types and pointers are marked as PODs.
-  EXPECT_TRUE(is_pod<bool>::value);
-  EXPECT_TRUE(is_pod<char>::value);
-  EXPECT_TRUE(is_pod<unsigned char>::value);
-  EXPECT_TRUE(is_pod<signed char>::value);
-  EXPECT_TRUE(is_pod<wchar_t>::value);
-  EXPECT_TRUE(is_pod<int>::value);
-  EXPECT_TRUE(is_pod<unsigned int>::value);
-  EXPECT_TRUE(is_pod<short>::value);
-  EXPECT_TRUE(is_pod<unsigned short>::value);
-  EXPECT_TRUE(is_pod<long>::value);
-  EXPECT_TRUE(is_pod<unsigned long>::value);
-  EXPECT_TRUE(is_pod<float>::value);
-  EXPECT_TRUE(is_pod<double>::value);
-  EXPECT_TRUE(is_pod<long double>::value);
-  EXPECT_TRUE(is_pod<string*>::value);
-  EXPECT_TRUE(is_pod<A*>::value);
-  EXPECT_TRUE(is_pod<const B*>::value);
-  EXPECT_TRUE(is_pod<C**>::value);
-  EXPECT_TRUE(is_pod<const int>::value);
-  EXPECT_TRUE(is_pod<char* volatile>::value);
-  EXPECT_TRUE(is_pod<const volatile double>::value);
-#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
-  EXPECT_TRUE(is_pod<G>::value);
-  EXPECT_TRUE(is_pod<const G>::value);
-  EXPECT_TRUE(is_pod<volatile G>::value);
-  EXPECT_TRUE(is_pod<const volatile G>::value);
-#endif
-
-  // Verify that some non-POD types are not marked as PODs.
-  EXPECT_FALSE(is_pod<void>::value);
-  EXPECT_FALSE(is_pod<string>::value);
-  EXPECT_FALSE((is_pod<pair<int, int> >::value));
-  EXPECT_FALSE(is_pod<A>::value);
-  EXPECT_FALSE(is_pod<B>::value);
-  EXPECT_FALSE(is_pod<C>::value);
-  EXPECT_FALSE(is_pod<const string>::value);
-  EXPECT_FALSE(is_pod<volatile A>::value);
-  EXPECT_FALSE(is_pod<const volatile B>::value);
-}
-
-TEST(TypeTraitsTest, TestHasTrivialConstructor) {
-  // Verify that arithmetic types and pointers have trivial constructors.
-  EXPECT_TRUE(has_trivial_constructor<bool>::value);
-  EXPECT_TRUE(has_trivial_constructor<char>::value);
-  EXPECT_TRUE(has_trivial_constructor<unsigned char>::value);
-  EXPECT_TRUE(has_trivial_constructor<signed char>::value);
-  EXPECT_TRUE(has_trivial_constructor<wchar_t>::value);
-  EXPECT_TRUE(has_trivial_constructor<int>::value);
-  EXPECT_TRUE(has_trivial_constructor<unsigned int>::value);
-  EXPECT_TRUE(has_trivial_constructor<short>::value);
-  EXPECT_TRUE(has_trivial_constructor<unsigned short>::value);
-  EXPECT_TRUE(has_trivial_constructor<long>::value);
-  EXPECT_TRUE(has_trivial_constructor<unsigned long>::value);
-  EXPECT_TRUE(has_trivial_constructor<float>::value);
-  EXPECT_TRUE(has_trivial_constructor<double>::value);
-  EXPECT_TRUE(has_trivial_constructor<long double>::value);
-  EXPECT_TRUE(has_trivial_constructor<string*>::value);
-  EXPECT_TRUE(has_trivial_constructor<A*>::value);
-  EXPECT_TRUE(has_trivial_constructor<const B*>::value);
-  EXPECT_TRUE(has_trivial_constructor<C**>::value);
-
-  // Verify that pairs and arrays of such types have trivial
-  // constructors.
-  typedef int int10[10];
-  EXPECT_TRUE((has_trivial_constructor<pair<int, char*> >::value));
-  EXPECT_TRUE(has_trivial_constructor<int10>::value);
-
-  // Verify that pairs of types without trivial constructors
-  // are not marked as trivial.
-  EXPECT_FALSE((has_trivial_constructor<pair<int, string> >::value));
-  EXPECT_FALSE((has_trivial_constructor<pair<string, int> >::value));
-
-  // Verify that types without trivial constructors are
-  // correctly marked as such.
-  EXPECT_FALSE(has_trivial_constructor<string>::value);
-  EXPECT_FALSE(has_trivial_constructor<vector<int> >::value);
-
-  // Verify that E, which we have declared to have a trivial
-  // constructor, is correctly marked as such.
-  EXPECT_TRUE(has_trivial_constructor<E>::value);
-}
-
-TEST(TypeTraitsTest, TestHasTrivialCopy) {
-  // Verify that arithmetic types and pointers have trivial copy
-  // constructors.
-  EXPECT_TRUE(has_trivial_copy<bool>::value);
-  EXPECT_TRUE(has_trivial_copy<char>::value);
-  EXPECT_TRUE(has_trivial_copy<unsigned char>::value);
-  EXPECT_TRUE(has_trivial_copy<signed char>::value);
-  EXPECT_TRUE(has_trivial_copy<wchar_t>::value);
-  EXPECT_TRUE(has_trivial_copy<int>::value);
-  EXPECT_TRUE(has_trivial_copy<unsigned int>::value);
-  EXPECT_TRUE(has_trivial_copy<short>::value);
-  EXPECT_TRUE(has_trivial_copy<unsigned short>::value);
-  EXPECT_TRUE(has_trivial_copy<long>::value);
-  EXPECT_TRUE(has_trivial_copy<unsigned long>::value);
-  EXPECT_TRUE(has_trivial_copy<float>::value);
-  EXPECT_TRUE(has_trivial_copy<double>::value);
-  EXPECT_TRUE(has_trivial_copy<long double>::value);
-  EXPECT_TRUE(has_trivial_copy<string*>::value);
-  EXPECT_TRUE(has_trivial_copy<A*>::value);
-  EXPECT_TRUE(has_trivial_copy<const B*>::value);
-  EXPECT_TRUE(has_trivial_copy<C**>::value);
-
-  // Verify that pairs and arrays of such types have trivial
-  // copy constructors.
-  typedef int int10[10];
-  EXPECT_TRUE((has_trivial_copy<pair<int, char*> >::value));
-  EXPECT_TRUE(has_trivial_copy<int10>::value);
-
-  // Verify that pairs of types without trivial copy constructors
-  // are not marked as trivial.
-  EXPECT_FALSE((has_trivial_copy<pair<int, string> >::value));
-  EXPECT_FALSE((has_trivial_copy<pair<string, int> >::value));
-
-  // Verify that types without trivial copy constructors are
-  // correctly marked as such.
-  EXPECT_FALSE(has_trivial_copy<string>::value);
-  EXPECT_FALSE(has_trivial_copy<vector<int> >::value);
-
-  // Verify that C, which we have declared to have a trivial
-  // copy constructor, is correctly marked as such.
-  EXPECT_TRUE(has_trivial_copy<C>::value);
-}
-
-TEST(TypeTraitsTest, TestHasTrivialAssign) {
-  // Verify that arithmetic types and pointers have trivial assignment
-  // operators.
-  EXPECT_TRUE(has_trivial_assign<bool>::value);
-  EXPECT_TRUE(has_trivial_assign<char>::value);
-  EXPECT_TRUE(has_trivial_assign<unsigned char>::value);
-  EXPECT_TRUE(has_trivial_assign<signed char>::value);
-  EXPECT_TRUE(has_trivial_assign<wchar_t>::value);
-  EXPECT_TRUE(has_trivial_assign<int>::value);
-  EXPECT_TRUE(has_trivial_assign<unsigned int>::value);
-  EXPECT_TRUE(has_trivial_assign<short>::value);
-  EXPECT_TRUE(has_trivial_assign<unsigned short>::value);
-  EXPECT_TRUE(has_trivial_assign<long>::value);
-  EXPECT_TRUE(has_trivial_assign<unsigned long>::value);
-  EXPECT_TRUE(has_trivial_assign<float>::value);
-  EXPECT_TRUE(has_trivial_assign<double>::value);
-  EXPECT_TRUE(has_trivial_assign<long double>::value);
-  EXPECT_TRUE(has_trivial_assign<string*>::value);
-  EXPECT_TRUE(has_trivial_assign<A*>::value);
-  EXPECT_TRUE(has_trivial_assign<const B*>::value);
-  EXPECT_TRUE(has_trivial_assign<C**>::value);
-
-  // Verify that pairs and arrays of such types have trivial
-  // assignment operators.
-  typedef int int10[10];
-  EXPECT_TRUE((has_trivial_assign<pair<int, char*> >::value));
-  EXPECT_TRUE(has_trivial_assign<int10>::value);
-
-  // Verify that pairs of types without trivial assignment operators
-  // are not marked as trivial.
-  EXPECT_FALSE((has_trivial_assign<pair<int, string> >::value));
-  EXPECT_FALSE((has_trivial_assign<pair<string, int> >::value));
-
-  // Verify that types without trivial assignment operators are
-  // correctly marked as such.
-  EXPECT_FALSE(has_trivial_assign<string>::value);
-  EXPECT_FALSE(has_trivial_assign<vector<int> >::value);
-
-  // Verify that D, which we have declared to have a trivial
-  // assignment operator, is correctly marked as such.
-  EXPECT_TRUE(has_trivial_assign<D>::value);
-}
-
-TEST(TypeTraitsTest, TestHasTrivialDestructor) {
-  // Verify that arithmetic types and pointers have trivial destructors.
-  EXPECT_TRUE(has_trivial_destructor<bool>::value);
-  EXPECT_TRUE(has_trivial_destructor<char>::value);
-  EXPECT_TRUE(has_trivial_destructor<unsigned char>::value);
-  EXPECT_TRUE(has_trivial_destructor<signed char>::value);
-  EXPECT_TRUE(has_trivial_destructor<wchar_t>::value);
-  EXPECT_TRUE(has_trivial_destructor<int>::value);
-  EXPECT_TRUE(has_trivial_destructor<unsigned int>::value);
-  EXPECT_TRUE(has_trivial_destructor<short>::value);
-  EXPECT_TRUE(has_trivial_destructor<unsigned short>::value);
-  EXPECT_TRUE(has_trivial_destructor<long>::value);
-  EXPECT_TRUE(has_trivial_destructor<unsigned long>::value);
-  EXPECT_TRUE(has_trivial_destructor<float>::value);
-  EXPECT_TRUE(has_trivial_destructor<double>::value);
-  EXPECT_TRUE(has_trivial_destructor<long double>::value);
-  EXPECT_TRUE(has_trivial_destructor<string*>::value);
-  EXPECT_TRUE(has_trivial_destructor<A*>::value);
-  EXPECT_TRUE(has_trivial_destructor<const B*>::value);
-  EXPECT_TRUE(has_trivial_destructor<C**>::value);
-
-  // Verify that pairs and arrays of such types have trivial
-  // destructors.
-  typedef int int10[10];
-  EXPECT_TRUE((has_trivial_destructor<pair<int, char*> >::value));
-  EXPECT_TRUE(has_trivial_destructor<int10>::value);
-
-  // Verify that pairs of types without trivial destructors
-  // are not marked as trivial.
-  EXPECT_FALSE((has_trivial_destructor<pair<int, string> >::value));
-  EXPECT_FALSE((has_trivial_destructor<pair<string, int> >::value));
-
-  // Verify that types without trivial destructors are
-  // correctly marked as such.
-  EXPECT_FALSE(has_trivial_destructor<string>::value);
-  EXPECT_FALSE(has_trivial_destructor<vector<int> >::value);
-
-  // Verify that F, which we have declared to have a trivial
-  // destructor, is correctly marked as such.
-  EXPECT_TRUE(has_trivial_destructor<F>::value);
-}
-
-// Tests remove_pointer.
-TEST(TypeTraitsTest, TestRemovePointer) {
-  COMPILE_ASSERT_TYPES_EQ(int, remove_pointer<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_pointer<int*>::type);
-  COMPILE_ASSERT_TYPES_EQ(const int, remove_pointer<const int*>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_pointer<int* const>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_pointer<int* volatile>::type);
-}
-
-TEST(TypeTraitsTest, TestRemoveConst) {
-  COMPILE_ASSERT_TYPES_EQ(int, remove_const<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_const<const int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int *, remove_const<int * const>::type);
-  // TR1 examples.
-  COMPILE_ASSERT_TYPES_EQ(const int *, remove_const<const int *>::type);
-  COMPILE_ASSERT_TYPES_EQ(volatile int,
-                          remove_const<const volatile int>::type);
-}
-
-TEST(TypeTraitsTest, TestRemoveVolatile) {
-  COMPILE_ASSERT_TYPES_EQ(int, remove_volatile<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_volatile<volatile int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int *, remove_volatile<int * volatile>::type);
-  // TR1 examples.
-  COMPILE_ASSERT_TYPES_EQ(volatile int *,
-                          remove_volatile<volatile int *>::type);
-  COMPILE_ASSERT_TYPES_EQ(const int,
-                          remove_volatile<const volatile int>::type);
-}
-
-TEST(TypeTraitsTest, TestRemoveCV) {
-  COMPILE_ASSERT_TYPES_EQ(int, remove_cv<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_cv<volatile int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_cv<const int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int *, remove_cv<int * const volatile>::type);
-  // TR1 examples.
-  COMPILE_ASSERT_TYPES_EQ(const volatile int *,
-                          remove_cv<const volatile int *>::type);
-  COMPILE_ASSERT_TYPES_EQ(int,
-                          remove_cv<const volatile int>::type);
-}
-
-TEST(TypeTraitsTest, TestRemoveReference) {
-  COMPILE_ASSERT_TYPES_EQ(int, remove_reference<int>::type);
-  COMPILE_ASSERT_TYPES_EQ(int, remove_reference<int&>::type);
-  COMPILE_ASSERT_TYPES_EQ(const int, remove_reference<const int&>::type);
-  COMPILE_ASSERT_TYPES_EQ(int*, remove_reference<int * &>::type);
-}
-
-TEST(TypeTraitsTest, TestIsSame) {
-  EXPECT_TRUE((is_same<int32, int32>::value));
-  EXPECT_FALSE((is_same<int32, int64>::value));
-  EXPECT_FALSE((is_same<int64, int32>::value));
-  EXPECT_FALSE((is_same<int, const int>::value));
-
-  EXPECT_TRUE((is_same<void, void>::value));
-  EXPECT_FALSE((is_same<void, int>::value));
-  EXPECT_FALSE((is_same<int, void>::value));
-
-  EXPECT_TRUE((is_same<int*, int*>::value));
-  EXPECT_TRUE((is_same<void*, void*>::value));
-  EXPECT_FALSE((is_same<int*, void*>::value));
-  EXPECT_FALSE((is_same<void*, int*>::value));
-  EXPECT_FALSE((is_same<void*, const void*>::value));
-  EXPECT_FALSE((is_same<void*, void* const>::value));
-
-  EXPECT_TRUE((is_same<Base*, Base*>::value));
-  EXPECT_TRUE((is_same<Derived*, Derived*>::value));
-  EXPECT_FALSE((is_same<Base*, Derived*>::value));
-  EXPECT_FALSE((is_same<Derived*, Base*>::value));
-}
-
-TEST(TypeTraitsTest, TestConvertible) {
-#if !(defined(__GNUC__) && __GNUC__ <= 3)
-  EXPECT_TRUE((is_convertible<int, int>::value));
-  EXPECT_TRUE((is_convertible<int, long>::value));
-  EXPECT_TRUE((is_convertible<long, int>::value));
-
-  EXPECT_TRUE((is_convertible<int*, void*>::value));
-  EXPECT_FALSE((is_convertible<void*, int*>::value));
-
-  EXPECT_TRUE((is_convertible<Derived*, Base*>::value));
-  EXPECT_FALSE((is_convertible<Base*, Derived*>::value));
-  EXPECT_TRUE((is_convertible<Derived*, const Base*>::value));
-  EXPECT_FALSE((is_convertible<const Derived*, Base*>::value));
-#endif
-}
-
-}  // anonymous namespace
-}  // namespace internal
-}  // namespace protobuf
-}  // namespace google
diff --git a/src/google/protobuf/test_messages_proto2.proto b/src/google/protobuf/test_messages_proto2.proto
new file mode 100644
index 00000000..60dbfc75
--- /dev/null
+++ b/src/google/protobuf/test_messages_proto2.proto
@@ -0,0 +1,216 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Test schema for proto2 messages.  This test schema is used by:
+//
+// - conformance tests
+//
+
+syntax = "proto2";
+
+package protobuf_test_messages.proto2;
+option java_package = "com.google.protobuf_test_messages.proto2";
+
+// This is the default, but we specify it here explicitly.
+option optimize_for = SPEED;
+
+option cc_enable_arenas = true;
+
+// This proto includes every type of field in both singular and repeated
+// forms.
+//
+// Also, crucially, all messages and enums in this file are eventually
+// submessages of this message.  So for example, a fuzz test of TestAllTypes
+// could trigger bugs that occur in any message type in this file.  We verify
+// this stays true in a unit test.
+message TestAllTypesProto2 {
+  message NestedMessage {
+    optional int32 a = 1;
+    optional TestAllTypesProto2 corecursive = 2;
+  }
+
+  enum NestedEnum {
+    FOO = 0;
+    BAR = 1;
+    BAZ = 2;
+    NEG = -1;  // Intentionally negative.
+  }
+
+  // Singular
+  optional int32 optional_int32    =  1;
+  optional int64 optional_int64    =  2;
+  optional uint32 optional_uint32   =  3;
+  optional uint64 optional_uint64   =  4;
+  optional sint32 optional_sint32   =  5;
+  optional sint64 optional_sint64   =  6;
+  optional fixed32 optional_fixed32  =  7;
+  optional fixed64 optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional float optional_float    = 11;
+  optional double optional_double   = 12;
+  optional bool optional_bool     = 13;
+  optional string optional_string   = 14;
+  optional bytes optional_bytes    = 15;
+
+  optional NestedMessage                        optional_nested_message  = 18;
+  optional ForeignMessageProto2                 optional_foreign_message = 19;
+
+  optional NestedEnum                           optional_nested_enum     = 21;
+  optional ForeignEnumProto2                    optional_foreign_enum    = 22;
+
+  optional string optional_string_piece = 24 [ctype=STRING_PIECE];
+  optional string optional_cord = 25 [ctype=CORD];
+
+  optional TestAllTypesProto2 recursive_message = 27;
+
+  // Repeated
+  repeated    int32 repeated_int32    = 31;
+  repeated    int64 repeated_int64    = 32;
+  repeated   uint32 repeated_uint32   = 33;
+  repeated   uint64 repeated_uint64   = 34;
+  repeated   sint32 repeated_sint32   = 35;
+  repeated   sint64 repeated_sint64   = 36;
+  repeated  fixed32 repeated_fixed32  = 37;
+  repeated  fixed64 repeated_fixed64  = 38;
+  repeated sfixed32 repeated_sfixed32 = 39;
+  repeated sfixed64 repeated_sfixed64 = 40;
+  repeated    float repeated_float    = 41;
+  repeated   double repeated_double   = 42;
+  repeated     bool repeated_bool     = 43;
+  repeated   string repeated_string   = 44;
+  repeated    bytes repeated_bytes    = 45;
+
+  repeated NestedMessage       repeated_nested_message  = 48;
+  repeated ForeignMessageProto2      repeated_foreign_message = 49;
+
+  repeated NestedEnum          repeated_nested_enum     = 51;
+  repeated ForeignEnumProto2         repeated_foreign_enum    = 52;
+
+  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord = 55 [ctype=CORD];
+
+  // Map
+  map <   int32, int32>    map_int32_int32 = 56;
+  map <   int64, int64>    map_int64_int64 = 57;
+  map <  uint32, uint32>   map_uint32_uint32 = 58;
+  map <  uint64, uint64>   map_uint64_uint64 = 59;
+  map <  sint32, sint32>   map_sint32_sint32 = 60;
+  map <  sint64, sint64>   map_sint64_sint64 = 61;
+  map < fixed32, fixed32>  map_fixed32_fixed32 = 62;
+  map < fixed64, fixed64>  map_fixed64_fixed64 = 63;
+  map <sfixed32, sfixed32> map_sfixed32_sfixed32 = 64;
+  map <sfixed64, sfixed64> map_sfixed64_sfixed64 = 65;
+  map <   int32, float>    map_int32_float = 66;
+  map <   int32, double>   map_int32_double = 67;
+  map <    bool, bool>     map_bool_bool = 68;
+  map <  string, string>   map_string_string = 69;
+  map <  string, bytes>    map_string_bytes = 70;
+  map <  string, NestedMessage>  map_string_nested_message = 71;
+  map <  string, ForeignMessageProto2> map_string_foreign_message = 72;
+  map <  string, NestedEnum>     map_string_nested_enum = 73;
+  map <  string, ForeignEnumProto2>    map_string_foreign_enum = 74;
+
+  oneof oneof_field {
+    uint32 oneof_uint32 = 111;
+    NestedMessage oneof_nested_message = 112;
+    string oneof_string = 113;
+    bytes oneof_bytes = 114;
+    bool oneof_bool = 115;
+    uint64 oneof_uint64 = 116;
+    float oneof_float = 117;
+    double oneof_double = 118;
+    NestedEnum oneof_enum = 119;
+  }
+
+  // extensions
+  extensions 120 to 200;
+
+  // groups
+  optional group Data = 201 {
+    optional int32 group_int32 = 202;
+    optional uint32 group_uint32 = 203;
+  };
+
+  // Test field-name-to-JSON-name convention.
+  // (protobuf says names can be any valid C/C++ identifier.)
+  optional int32 fieldname1 = 401;
+  optional int32 field_name2 = 402;
+  optional int32 _field_name3 = 403;
+  optional int32 field__name4_ = 404;
+  optional int32 field0name5 = 405;
+  optional int32 field_0_name6 = 406;
+  optional int32 fieldName7 = 407;
+  optional int32 FieldName8 = 408;
+  optional int32 field_Name9 = 409;
+  optional int32 Field_Name10 = 410;
+  optional int32 FIELD_NAME11 = 411;
+  optional int32 FIELD_name12 = 412;
+  optional int32 __field_name13 = 413;
+  optional int32 __Field_name14 = 414;
+  optional int32 field__name15 = 415;
+  optional int32 field__Name16 = 416;
+  optional int32 field_name17__ = 417;
+  optional int32 Field_name18__ = 418;
+
+  // message_set test case.
+  message MessageSetCorrect {
+    option message_set_wire_format = true;
+    extensions 4 to max;
+  }
+
+  message MessageSetCorrectExtension1 {
+    extend MessageSetCorrect {
+      optional MessageSetCorrectExtension1 message_set_extension = 1547769;
+    }
+    optional string str = 25;
+  }
+
+  message MessageSetCorrectExtension2 {
+    extend MessageSetCorrect {
+      optional MessageSetCorrectExtension2 message_set_extension = 4135312;
+    }
+    optional int32 i = 9;
+  }
+}
+
+message ForeignMessageProto2 {
+  optional int32 c = 1;
+}
+
+enum ForeignEnumProto2 {
+  FOREIGN_FOO = 0;
+  FOREIGN_BAR = 1;
+  FOREIGN_BAZ = 2;
+}
+
+extend TestAllTypesProto2 {
+  optional int32 extension_int32 = 120;
+}
diff --git a/src/google/protobuf/test_messages_proto3.proto b/src/google/protobuf/test_messages_proto3.proto
index 79230334..4f295aac 100644
--- a/src/google/protobuf/test_messages_proto3.proto
+++ b/src/google/protobuf/test_messages_proto3.proto
@@ -39,6 +39,7 @@ syntax = "proto3";
 
 package protobuf_test_messages.proto3;
 option java_package = "com.google.protobuf_test_messages.proto3";
+option objc_class_prefix = "Proto3";
 
 // This is the default, but we specify it here explicitly.
 option optimize_for = SPEED;
@@ -59,10 +60,10 @@ option cc_enable_arenas = true;
 // submessages of this message.  So for example, a fuzz test of TestAllTypes
 // could trigger bugs that occur in any message type in this file.  We verify
 // this stays true in a unit test.
-message TestAllTypes {
+message TestAllTypesProto3 {
   message NestedMessage {
     int32 a = 1;
-    TestAllTypes corecursive = 2;
+    TestAllTypesProto3 corecursive = 2;
   }
 
   enum NestedEnum {
@@ -98,7 +99,7 @@ message TestAllTypes {
   string optional_string_piece = 24 [ctype=STRING_PIECE];
   string optional_cord = 25 [ctype=CORD];
 
-  TestAllTypes recursive_message = 27;
+  TestAllTypesProto3 recursive_message = 27;
 
   // Repeated
   repeated    int32 repeated_int32    = 31;
@@ -214,6 +215,9 @@ message TestAllTypes {
   int32 field__Name16 = 416;
   int32 field_name17__ = 417;
   int32 Field_name18__ = 418;
+
+  // Reserved for testing unknown fields
+  reserved 501 to 510;
 }
 
 message ForeignMessage {
diff --git a/src/google/protobuf/test_util.cc b/src/google/protobuf/test_util.cc
index 4e02a85d..795cb6ae 100644
--- a/src/google/protobuf/test_util.cc
+++ b/src/google/protobuf/test_util.cc
@@ -39,3312 +39,9 @@
 #endif
 
 #include <google/protobuf/test_util.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/message.h>
-
-#include <google/protobuf/stubs/logging.h>
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/testing/googletest.h>
-#include <gtest/gtest.h>
 
 namespace google {
 namespace protobuf {
 
-void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
-  SetOptionalFields(message);
-  AddRepeatedFields1(message);
-  AddRepeatedFields2(message);
-  SetDefaultFields(message);
-  SetOneofFields(message);
-}
-
-void TestUtil::SetOptionalFields(unittest::TestAllTypes* message) {
-  message->set_optional_int32   (101);
-  message->set_optional_int64   (102);
-  message->set_optional_uint32  (103);
-  message->set_optional_uint64  (104);
-  message->set_optional_sint32  (105);
-  message->set_optional_sint64  (106);
-  message->set_optional_fixed32 (107);
-  message->set_optional_fixed64 (108);
-  message->set_optional_sfixed32(109);
-  message->set_optional_sfixed64(110);
-  message->set_optional_float   (111);
-  message->set_optional_double  (112);
-  message->set_optional_bool    (true);
-  message->set_optional_string  ("115");
-  message->set_optional_bytes   ("116");
-
-  message->mutable_optionalgroup                 ()->set_a(117);
-  message->mutable_optional_nested_message       ()->set_bb(118);
-  message->mutable_optional_foreign_message      ()->set_c(119);
-  message->mutable_optional_import_message       ()->set_d(120);
-  message->mutable_optional_public_import_message()->set_e(126);
-  message->mutable_optional_lazy_message         ()->set_bb(127);
-
-  message->set_optional_nested_enum (unittest::TestAllTypes::BAZ);
-  message->set_optional_foreign_enum(unittest::FOREIGN_BAZ      );
-  message->set_optional_import_enum (unittest_import::IMPORT_BAZ);
-
-  // StringPiece and Cord fields are only accessible via reflection in the
-  // open source release; see comments in compiler/cpp/string_field.cc.
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  message->GetReflection()->SetString(
-    message,
-    message->GetDescriptor()->FindFieldByName("optional_string_piece"),
-    "124");
-  message->GetReflection()->SetString(
-    message,
-    message->GetDescriptor()->FindFieldByName("optional_cord"),
-    "125");
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::AddRepeatedFields1(unittest::TestAllTypes* message) {
-  message->add_repeated_int32   (201);
-  message->add_repeated_int64   (202);
-  message->add_repeated_uint32  (203);
-  message->add_repeated_uint64  (204);
-  message->add_repeated_sint32  (205);
-  message->add_repeated_sint64  (206);
-  message->add_repeated_fixed32 (207);
-  message->add_repeated_fixed64 (208);
-  message->add_repeated_sfixed32(209);
-  message->add_repeated_sfixed64(210);
-  message->add_repeated_float   (211);
-  message->add_repeated_double  (212);
-  message->add_repeated_bool    (true);
-  message->add_repeated_string  ("215");
-  message->add_repeated_bytes   ("216");
-
-  message->add_repeatedgroup           ()->set_a(217);
-  message->add_repeated_nested_message ()->set_bb(218);
-  message->add_repeated_foreign_message()->set_c(219);
-  message->add_repeated_import_message ()->set_d(220);
-  message->add_repeated_lazy_message   ()->set_bb(227);
-
-  message->add_repeated_nested_enum (unittest::TestAllTypes::BAR);
-  message->add_repeated_foreign_enum(unittest::FOREIGN_BAR      );
-  message->add_repeated_import_enum (unittest_import::IMPORT_BAR);
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  message->GetReflection()->AddString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_string_piece"),
-    "224");
-  message->GetReflection()->AddString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_cord"),
-    "225");
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-}
-
-void TestUtil::AddRepeatedFields2(unittest::TestAllTypes* message) {
-  // Add a second one of each field.
-  message->add_repeated_int32   (301);
-  message->add_repeated_int64   (302);
-  message->add_repeated_uint32  (303);
-  message->add_repeated_uint64  (304);
-  message->add_repeated_sint32  (305);
-  message->add_repeated_sint64  (306);
-  message->add_repeated_fixed32 (307);
-  message->add_repeated_fixed64 (308);
-  message->add_repeated_sfixed32(309);
-  message->add_repeated_sfixed64(310);
-  message->add_repeated_float   (311);
-  message->add_repeated_double  (312);
-  message->add_repeated_bool    (false);
-  message->add_repeated_string  ("315");
-  message->add_repeated_bytes   ("316");
-
-  message->add_repeatedgroup           ()->set_a(317);
-  message->add_repeated_nested_message ()->set_bb(318);
-  message->add_repeated_foreign_message()->set_c(319);
-  message->add_repeated_import_message ()->set_d(320);
-  message->add_repeated_lazy_message   ()->set_bb(327);
-
-  message->add_repeated_nested_enum (unittest::TestAllTypes::BAZ);
-  message->add_repeated_foreign_enum(unittest::FOREIGN_BAZ      );
-  message->add_repeated_import_enum (unittest_import::IMPORT_BAZ);
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  message->GetReflection()->AddString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_string_piece"),
-    "324");
-  message->GetReflection()->AddString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_cord"),
-    "325");
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::SetDefaultFields(unittest::TestAllTypes* message) {
-  message->set_default_int32   (401);
-  message->set_default_int64   (402);
-  message->set_default_uint32  (403);
-  message->set_default_uint64  (404);
-  message->set_default_sint32  (405);
-  message->set_default_sint64  (406);
-  message->set_default_fixed32 (407);
-  message->set_default_fixed64 (408);
-  message->set_default_sfixed32(409);
-  message->set_default_sfixed64(410);
-  message->set_default_float   (411);
-  message->set_default_double  (412);
-  message->set_default_bool    (false);
-  message->set_default_string  ("415");
-  message->set_default_bytes   ("416");
-
-  message->set_default_nested_enum (unittest::TestAllTypes::FOO);
-  message->set_default_foreign_enum(unittest::FOREIGN_FOO      );
-  message->set_default_import_enum (unittest_import::IMPORT_FOO);
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  message->GetReflection()->SetString(
-    message,
-    message->GetDescriptor()->FindFieldByName("default_string_piece"),
-    "424");
-  message->GetReflection()->SetString(
-    message,
-    message->GetDescriptor()->FindFieldByName("default_cord"),
-    "425");
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ModifyRepeatedFields(unittest::TestAllTypes* message) {
-  message->set_repeated_int32   (1, 501);
-  message->set_repeated_int64   (1, 502);
-  message->set_repeated_uint32  (1, 503);
-  message->set_repeated_uint64  (1, 504);
-  message->set_repeated_sint32  (1, 505);
-  message->set_repeated_sint64  (1, 506);
-  message->set_repeated_fixed32 (1, 507);
-  message->set_repeated_fixed64 (1, 508);
-  message->set_repeated_sfixed32(1, 509);
-  message->set_repeated_sfixed64(1, 510);
-  message->set_repeated_float   (1, 511);
-  message->set_repeated_double  (1, 512);
-  message->set_repeated_bool    (1, true);
-  message->set_repeated_string  (1, "515");
-  message->set_repeated_bytes   (1, "516");
-
-  message->mutable_repeatedgroup           (1)->set_a(517);
-  message->mutable_repeated_nested_message (1)->set_bb(518);
-  message->mutable_repeated_foreign_message(1)->set_c(519);
-  message->mutable_repeated_import_message (1)->set_d(520);
-  message->mutable_repeated_lazy_message   (1)->set_bb(527);
-
-  message->set_repeated_nested_enum (1, unittest::TestAllTypes::FOO);
-  message->set_repeated_foreign_enum(1, unittest::FOREIGN_FOO      );
-  message->set_repeated_import_enum (1, unittest_import::IMPORT_FOO);
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  message->GetReflection()->SetRepeatedString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_string_piece"),
-    1, "524");
-  message->GetReflection()->SetRepeatedString(
-    message,
-    message->GetDescriptor()->FindFieldByName("repeated_cord"),
-    1, "525");
-#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
-}
-
-// ------------------------------------------------------------------
-void TestUtil::SetOneofFields(unittest::TestAllTypes* message) {
-  message->set_oneof_uint32(601);
-  message->mutable_oneof_nested_message()->set_bb(602);
-  message->set_oneof_string("603");
-  message->set_oneof_bytes("604");
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
-  EXPECT_TRUE(message.has_optional_int32   ());
-  EXPECT_TRUE(message.has_optional_int64   ());
-  EXPECT_TRUE(message.has_optional_uint32  ());
-  EXPECT_TRUE(message.has_optional_uint64  ());
-  EXPECT_TRUE(message.has_optional_sint32  ());
-  EXPECT_TRUE(message.has_optional_sint64  ());
-  EXPECT_TRUE(message.has_optional_fixed32 ());
-  EXPECT_TRUE(message.has_optional_fixed64 ());
-  EXPECT_TRUE(message.has_optional_sfixed32());
-  EXPECT_TRUE(message.has_optional_sfixed64());
-  EXPECT_TRUE(message.has_optional_float   ());
-  EXPECT_TRUE(message.has_optional_double  ());
-  EXPECT_TRUE(message.has_optional_bool    ());
-  EXPECT_TRUE(message.has_optional_string  ());
-  EXPECT_TRUE(message.has_optional_bytes   ());
-
-  EXPECT_TRUE(message.has_optionalgroup                 ());
-  EXPECT_TRUE(message.has_optional_nested_message       ());
-  EXPECT_TRUE(message.has_optional_foreign_message      ());
-  EXPECT_TRUE(message.has_optional_import_message       ());
-  EXPECT_TRUE(message.has_optional_public_import_message());
-  EXPECT_TRUE(message.has_optional_lazy_message         ());
-
-  EXPECT_TRUE(message.optionalgroup                 ().has_a());
-  EXPECT_TRUE(message.optional_nested_message       ().has_bb());
-  EXPECT_TRUE(message.optional_foreign_message      ().has_c());
-  EXPECT_TRUE(message.optional_import_message       ().has_d());
-  EXPECT_TRUE(message.optional_public_import_message().has_e());
-  EXPECT_TRUE(message.optional_lazy_message         ().has_bb());
-
-  EXPECT_TRUE(message.has_optional_nested_enum ());
-  EXPECT_TRUE(message.has_optional_foreign_enum());
-  EXPECT_TRUE(message.has_optional_import_enum ());
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  EXPECT_TRUE(message.has_optional_string_piece());
-  EXPECT_TRUE(message.has_optional_cord());
-#endif
-
-  EXPECT_EQ(101  , message.optional_int32   ());
-  EXPECT_EQ(102  , message.optional_int64   ());
-  EXPECT_EQ(103  , message.optional_uint32  ());
-  EXPECT_EQ(104  , message.optional_uint64  ());
-  EXPECT_EQ(105  , message.optional_sint32  ());
-  EXPECT_EQ(106  , message.optional_sint64  ());
-  EXPECT_EQ(107  , message.optional_fixed32 ());
-  EXPECT_EQ(108  , message.optional_fixed64 ());
-  EXPECT_EQ(109  , message.optional_sfixed32());
-  EXPECT_EQ(110  , message.optional_sfixed64());
-  EXPECT_EQ(111  , message.optional_float   ());
-  EXPECT_EQ(112  , message.optional_double  ());
-  EXPECT_TRUE(     message.optional_bool    ());
-  EXPECT_EQ("115", message.optional_string  ());
-  EXPECT_EQ("116", message.optional_bytes   ());
-
-  EXPECT_EQ(117, message.optionalgroup                  ().a());
-  EXPECT_EQ(118, message.optional_nested_message        ().bb());
-  EXPECT_EQ(119, message.optional_foreign_message       ().c());
-  EXPECT_EQ(120, message.optional_import_message        ().d());
-  EXPECT_EQ(126, message.optional_public_import_message ().e());
-  EXPECT_EQ(127, message.optional_lazy_message          ().bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.optional_nested_enum ());
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.optional_foreign_enum());
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.optional_import_enum ());
-
-
-  // -----------------------------------------------------------------
-
-  ASSERT_EQ(2, message.repeated_int32_size   ());
-  ASSERT_EQ(2, message.repeated_int64_size   ());
-  ASSERT_EQ(2, message.repeated_uint32_size  ());
-  ASSERT_EQ(2, message.repeated_uint64_size  ());
-  ASSERT_EQ(2, message.repeated_sint32_size  ());
-  ASSERT_EQ(2, message.repeated_sint64_size  ());
-  ASSERT_EQ(2, message.repeated_fixed32_size ());
-  ASSERT_EQ(2, message.repeated_fixed64_size ());
-  ASSERT_EQ(2, message.repeated_sfixed32_size());
-  ASSERT_EQ(2, message.repeated_sfixed64_size());
-  ASSERT_EQ(2, message.repeated_float_size   ());
-  ASSERT_EQ(2, message.repeated_double_size  ());
-  ASSERT_EQ(2, message.repeated_bool_size    ());
-  ASSERT_EQ(2, message.repeated_string_size  ());
-  ASSERT_EQ(2, message.repeated_bytes_size   ());
-
-  ASSERT_EQ(2, message.repeatedgroup_size           ());
-  ASSERT_EQ(2, message.repeated_nested_message_size ());
-  ASSERT_EQ(2, message.repeated_foreign_message_size());
-  ASSERT_EQ(2, message.repeated_import_message_size ());
-  ASSERT_EQ(2, message.repeated_lazy_message_size   ());
-  ASSERT_EQ(2, message.repeated_nested_enum_size    ());
-  ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
-  ASSERT_EQ(2, message.repeated_import_enum_size    ());
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  ASSERT_EQ(2, message.repeated_string_piece_size());
-  ASSERT_EQ(2, message.repeated_cord_size());
-#endif
-
-  EXPECT_EQ(201  , message.repeated_int32   (0));
-  EXPECT_EQ(202  , message.repeated_int64   (0));
-  EXPECT_EQ(203  , message.repeated_uint32  (0));
-  EXPECT_EQ(204  , message.repeated_uint64  (0));
-  EXPECT_EQ(205  , message.repeated_sint32  (0));
-  EXPECT_EQ(206  , message.repeated_sint64  (0));
-  EXPECT_EQ(207  , message.repeated_fixed32 (0));
-  EXPECT_EQ(208  , message.repeated_fixed64 (0));
-  EXPECT_EQ(209  , message.repeated_sfixed32(0));
-  EXPECT_EQ(210  , message.repeated_sfixed64(0));
-  EXPECT_EQ(211  , message.repeated_float   (0));
-  EXPECT_EQ(212  , message.repeated_double  (0));
-  EXPECT_TRUE(     message.repeated_bool    (0));
-  EXPECT_EQ("215", message.repeated_string  (0));
-  EXPECT_EQ("216", message.repeated_bytes   (0));
-
-  EXPECT_EQ(217, message.repeatedgroup           (0).a());
-  EXPECT_EQ(218, message.repeated_nested_message (0).bb());
-  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-  EXPECT_EQ(227, message.repeated_lazy_message   (0).bb());
-
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.repeated_import_enum (0));
-
-  EXPECT_EQ(301  , message.repeated_int32   (1));
-  EXPECT_EQ(302  , message.repeated_int64   (1));
-  EXPECT_EQ(303  , message.repeated_uint32  (1));
-  EXPECT_EQ(304  , message.repeated_uint64  (1));
-  EXPECT_EQ(305  , message.repeated_sint32  (1));
-  EXPECT_EQ(306  , message.repeated_sint64  (1));
-  EXPECT_EQ(307  , message.repeated_fixed32 (1));
-  EXPECT_EQ(308  , message.repeated_fixed64 (1));
-  EXPECT_EQ(309  , message.repeated_sfixed32(1));
-  EXPECT_EQ(310  , message.repeated_sfixed64(1));
-  EXPECT_EQ(311  , message.repeated_float   (1));
-  EXPECT_EQ(312  , message.repeated_double  (1));
-  EXPECT_FALSE(    message.repeated_bool    (1));
-  EXPECT_EQ("315", message.repeated_string  (1));
-  EXPECT_EQ("316", message.repeated_bytes   (1));
-
-  EXPECT_EQ(317, message.repeatedgroup           (1).a());
-  EXPECT_EQ(318, message.repeated_nested_message (1).bb());
-  EXPECT_EQ(319, message.repeated_foreign_message(1).c());
-  EXPECT_EQ(320, message.repeated_import_message (1).d());
-  EXPECT_EQ(327, message.repeated_lazy_message   (1).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.repeated_nested_enum (1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.repeated_foreign_enum(1));
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.repeated_import_enum (1));
-
-
-  // -----------------------------------------------------------------
-
-  EXPECT_TRUE(message.has_default_int32   ());
-  EXPECT_TRUE(message.has_default_int64   ());
-  EXPECT_TRUE(message.has_default_uint32  ());
-  EXPECT_TRUE(message.has_default_uint64  ());
-  EXPECT_TRUE(message.has_default_sint32  ());
-  EXPECT_TRUE(message.has_default_sint64  ());
-  EXPECT_TRUE(message.has_default_fixed32 ());
-  EXPECT_TRUE(message.has_default_fixed64 ());
-  EXPECT_TRUE(message.has_default_sfixed32());
-  EXPECT_TRUE(message.has_default_sfixed64());
-  EXPECT_TRUE(message.has_default_float   ());
-  EXPECT_TRUE(message.has_default_double  ());
-  EXPECT_TRUE(message.has_default_bool    ());
-  EXPECT_TRUE(message.has_default_string  ());
-  EXPECT_TRUE(message.has_default_bytes   ());
-
-  EXPECT_TRUE(message.has_default_nested_enum ());
-  EXPECT_TRUE(message.has_default_foreign_enum());
-  EXPECT_TRUE(message.has_default_import_enum ());
-
-
-  EXPECT_EQ(401  , message.default_int32   ());
-  EXPECT_EQ(402  , message.default_int64   ());
-  EXPECT_EQ(403  , message.default_uint32  ());
-  EXPECT_EQ(404  , message.default_uint64  ());
-  EXPECT_EQ(405  , message.default_sint32  ());
-  EXPECT_EQ(406  , message.default_sint64  ());
-  EXPECT_EQ(407  , message.default_fixed32 ());
-  EXPECT_EQ(408  , message.default_fixed64 ());
-  EXPECT_EQ(409  , message.default_sfixed32());
-  EXPECT_EQ(410  , message.default_sfixed64());
-  EXPECT_EQ(411  , message.default_float   ());
-  EXPECT_EQ(412  , message.default_double  ());
-  EXPECT_FALSE(    message.default_bool    ());
-  EXPECT_EQ("415", message.default_string  ());
-  EXPECT_EQ("416", message.default_bytes   ());
-
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.default_nested_enum ());
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.default_foreign_enum());
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.default_import_enum ());
-
-
-  EXPECT_FALSE(message.has_oneof_uint32        ());
-  EXPECT_FALSE(message.has_oneof_nested_message());
-  EXPECT_FALSE(message.has_oneof_string        ());
-  EXPECT_TRUE(message.has_oneof_bytes          ());
-
-  EXPECT_EQ("604", message.oneof_bytes());
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectClear(const unittest::TestAllTypes& message) {
-  // has_blah() should initially be false for all optional fields.
-  EXPECT_FALSE(message.has_optional_int32   ());
-  EXPECT_FALSE(message.has_optional_int64   ());
-  EXPECT_FALSE(message.has_optional_uint32  ());
-  EXPECT_FALSE(message.has_optional_uint64  ());
-  EXPECT_FALSE(message.has_optional_sint32  ());
-  EXPECT_FALSE(message.has_optional_sint64  ());
-  EXPECT_FALSE(message.has_optional_fixed32 ());
-  EXPECT_FALSE(message.has_optional_fixed64 ());
-  EXPECT_FALSE(message.has_optional_sfixed32());
-  EXPECT_FALSE(message.has_optional_sfixed64());
-  EXPECT_FALSE(message.has_optional_float   ());
-  EXPECT_FALSE(message.has_optional_double  ());
-  EXPECT_FALSE(message.has_optional_bool    ());
-  EXPECT_FALSE(message.has_optional_string  ());
-  EXPECT_FALSE(message.has_optional_bytes   ());
-
-  EXPECT_FALSE(message.has_optionalgroup                 ());
-  EXPECT_FALSE(message.has_optional_nested_message       ());
-  EXPECT_FALSE(message.has_optional_foreign_message      ());
-  EXPECT_FALSE(message.has_optional_import_message       ());
-  EXPECT_FALSE(message.has_optional_public_import_message());
-  EXPECT_FALSE(message.has_optional_lazy_message         ());
-
-  EXPECT_FALSE(message.has_optional_nested_enum ());
-  EXPECT_FALSE(message.has_optional_foreign_enum());
-  EXPECT_FALSE(message.has_optional_import_enum ());
-
-  EXPECT_FALSE(message.has_optional_string_piece());
-  EXPECT_FALSE(message.has_optional_cord());
-
-  // Optional fields without defaults are set to zero or something like it.
-  EXPECT_EQ(0    , message.optional_int32   ());
-  EXPECT_EQ(0    , message.optional_int64   ());
-  EXPECT_EQ(0    , message.optional_uint32  ());
-  EXPECT_EQ(0    , message.optional_uint64  ());
-  EXPECT_EQ(0    , message.optional_sint32  ());
-  EXPECT_EQ(0    , message.optional_sint64  ());
-  EXPECT_EQ(0    , message.optional_fixed32 ());
-  EXPECT_EQ(0    , message.optional_fixed64 ());
-  EXPECT_EQ(0    , message.optional_sfixed32());
-  EXPECT_EQ(0    , message.optional_sfixed64());
-  EXPECT_EQ(0    , message.optional_float   ());
-  EXPECT_EQ(0    , message.optional_double  ());
-  EXPECT_FALSE(    message.optional_bool    ());
-  EXPECT_EQ(""   , message.optional_string  ());
-  EXPECT_EQ(""   , message.optional_bytes   ());
-
-  // Embedded messages should also be clear.
-  EXPECT_FALSE(message.optionalgroup                 ().has_a());
-  EXPECT_FALSE(message.optional_nested_message       ().has_bb());
-  EXPECT_FALSE(message.optional_foreign_message      ().has_c());
-  EXPECT_FALSE(message.optional_import_message       ().has_d());
-  EXPECT_FALSE(message.optional_public_import_message().has_e());
-  EXPECT_FALSE(message.optional_lazy_message         ().has_bb());
-
-  EXPECT_EQ(0, message.optionalgroup                 ().a());
-  EXPECT_EQ(0, message.optional_nested_message       ().bb());
-  EXPECT_EQ(0, message.optional_foreign_message      ().c());
-  EXPECT_EQ(0, message.optional_import_message       ().d());
-  EXPECT_EQ(0, message.optional_public_import_message().e());
-  EXPECT_EQ(0, message.optional_lazy_message         ().bb());
-
-  // Enums without defaults are set to the first value in the enum.
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.optional_nested_enum ());
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.optional_foreign_enum());
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.optional_import_enum ());
-
-
-  // Repeated fields are empty.
-  EXPECT_EQ(0, message.repeated_int32_size   ());
-  EXPECT_EQ(0, message.repeated_int64_size   ());
-  EXPECT_EQ(0, message.repeated_uint32_size  ());
-  EXPECT_EQ(0, message.repeated_uint64_size  ());
-  EXPECT_EQ(0, message.repeated_sint32_size  ());
-  EXPECT_EQ(0, message.repeated_sint64_size  ());
-  EXPECT_EQ(0, message.repeated_fixed32_size ());
-  EXPECT_EQ(0, message.repeated_fixed64_size ());
-  EXPECT_EQ(0, message.repeated_sfixed32_size());
-  EXPECT_EQ(0, message.repeated_sfixed64_size());
-  EXPECT_EQ(0, message.repeated_float_size   ());
-  EXPECT_EQ(0, message.repeated_double_size  ());
-  EXPECT_EQ(0, message.repeated_bool_size    ());
-  EXPECT_EQ(0, message.repeated_string_size  ());
-  EXPECT_EQ(0, message.repeated_bytes_size   ());
-
-  EXPECT_EQ(0, message.repeatedgroup_size           ());
-  EXPECT_EQ(0, message.repeated_nested_message_size ());
-  EXPECT_EQ(0, message.repeated_foreign_message_size());
-  EXPECT_EQ(0, message.repeated_import_message_size ());
-  EXPECT_EQ(0, message.repeated_lazy_message_size   ());
-  EXPECT_EQ(0, message.repeated_nested_enum_size    ());
-  EXPECT_EQ(0, message.repeated_foreign_enum_size   ());
-  EXPECT_EQ(0, message.repeated_import_enum_size    ());
-
-  EXPECT_EQ(0, message.repeated_string_piece_size());
-  EXPECT_EQ(0, message.repeated_cord_size());
-
-  // has_blah() should also be false for all default fields.
-  EXPECT_FALSE(message.has_default_int32   ());
-  EXPECT_FALSE(message.has_default_int64   ());
-  EXPECT_FALSE(message.has_default_uint32  ());
-  EXPECT_FALSE(message.has_default_uint64  ());
-  EXPECT_FALSE(message.has_default_sint32  ());
-  EXPECT_FALSE(message.has_default_sint64  ());
-  EXPECT_FALSE(message.has_default_fixed32 ());
-  EXPECT_FALSE(message.has_default_fixed64 ());
-  EXPECT_FALSE(message.has_default_sfixed32());
-  EXPECT_FALSE(message.has_default_sfixed64());
-  EXPECT_FALSE(message.has_default_float   ());
-  EXPECT_FALSE(message.has_default_double  ());
-  EXPECT_FALSE(message.has_default_bool    ());
-  EXPECT_FALSE(message.has_default_string  ());
-  EXPECT_FALSE(message.has_default_bytes   ());
-
-  EXPECT_FALSE(message.has_default_nested_enum ());
-  EXPECT_FALSE(message.has_default_foreign_enum());
-  EXPECT_FALSE(message.has_default_import_enum ());
-
-
-  // Fields with defaults have their default values (duh).
-  EXPECT_EQ( 41    , message.default_int32   ());
-  EXPECT_EQ( 42    , message.default_int64   ());
-  EXPECT_EQ( 43    , message.default_uint32  ());
-  EXPECT_EQ( 44    , message.default_uint64  ());
-  EXPECT_EQ(-45    , message.default_sint32  ());
-  EXPECT_EQ( 46    , message.default_sint64  ());
-  EXPECT_EQ( 47    , message.default_fixed32 ());
-  EXPECT_EQ( 48    , message.default_fixed64 ());
-  EXPECT_EQ( 49    , message.default_sfixed32());
-  EXPECT_EQ(-50    , message.default_sfixed64());
-  EXPECT_EQ( 51.5  , message.default_float   ());
-  EXPECT_EQ( 52e3  , message.default_double  ());
-  EXPECT_TRUE(       message.default_bool    ());
-  EXPECT_EQ("hello", message.default_string  ());
-  EXPECT_EQ("world", message.default_bytes   ());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.default_nested_enum ());
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.default_foreign_enum());
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.default_import_enum ());
-
-
-  EXPECT_FALSE(message.has_oneof_uint32        ());
-  EXPECT_FALSE(message.has_oneof_nested_message());
-  EXPECT_FALSE(message.has_oneof_string        ());
-  EXPECT_FALSE(message.has_oneof_bytes         ());
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectRepeatedFieldsModified(
-    const unittest::TestAllTypes& message) {
-  // ModifyRepeatedFields only sets the second repeated element of each
-  // field.  In addition to verifying this, we also verify that the first
-  // element and size were *not* modified.
-  ASSERT_EQ(2, message.repeated_int32_size   ());
-  ASSERT_EQ(2, message.repeated_int64_size   ());
-  ASSERT_EQ(2, message.repeated_uint32_size  ());
-  ASSERT_EQ(2, message.repeated_uint64_size  ());
-  ASSERT_EQ(2, message.repeated_sint32_size  ());
-  ASSERT_EQ(2, message.repeated_sint64_size  ());
-  ASSERT_EQ(2, message.repeated_fixed32_size ());
-  ASSERT_EQ(2, message.repeated_fixed64_size ());
-  ASSERT_EQ(2, message.repeated_sfixed32_size());
-  ASSERT_EQ(2, message.repeated_sfixed64_size());
-  ASSERT_EQ(2, message.repeated_float_size   ());
-  ASSERT_EQ(2, message.repeated_double_size  ());
-  ASSERT_EQ(2, message.repeated_bool_size    ());
-  ASSERT_EQ(2, message.repeated_string_size  ());
-  ASSERT_EQ(2, message.repeated_bytes_size   ());
-
-  ASSERT_EQ(2, message.repeatedgroup_size           ());
-  ASSERT_EQ(2, message.repeated_nested_message_size ());
-  ASSERT_EQ(2, message.repeated_foreign_message_size());
-  ASSERT_EQ(2, message.repeated_import_message_size ());
-  ASSERT_EQ(2, message.repeated_lazy_message_size   ());
-  ASSERT_EQ(2, message.repeated_nested_enum_size    ());
-  ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
-  ASSERT_EQ(2, message.repeated_import_enum_size    ());
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  ASSERT_EQ(2, message.repeated_string_piece_size());
-  ASSERT_EQ(2, message.repeated_cord_size());
-#endif
-
-  EXPECT_EQ(201  , message.repeated_int32   (0));
-  EXPECT_EQ(202  , message.repeated_int64   (0));
-  EXPECT_EQ(203  , message.repeated_uint32  (0));
-  EXPECT_EQ(204  , message.repeated_uint64  (0));
-  EXPECT_EQ(205  , message.repeated_sint32  (0));
-  EXPECT_EQ(206  , message.repeated_sint64  (0));
-  EXPECT_EQ(207  , message.repeated_fixed32 (0));
-  EXPECT_EQ(208  , message.repeated_fixed64 (0));
-  EXPECT_EQ(209  , message.repeated_sfixed32(0));
-  EXPECT_EQ(210  , message.repeated_sfixed64(0));
-  EXPECT_EQ(211  , message.repeated_float   (0));
-  EXPECT_EQ(212  , message.repeated_double  (0));
-  EXPECT_TRUE(     message.repeated_bool    (0));
-  EXPECT_EQ("215", message.repeated_string  (0));
-  EXPECT_EQ("216", message.repeated_bytes   (0));
-
-  EXPECT_EQ(217, message.repeatedgroup           (0).a());
-  EXPECT_EQ(218, message.repeated_nested_message (0).bb());
-  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-  EXPECT_EQ(227, message.repeated_lazy_message   (0).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.repeated_import_enum (0));
-
-
-  // Actually verify the second (modified) elements now.
-  EXPECT_EQ(501  , message.repeated_int32   (1));
-  EXPECT_EQ(502  , message.repeated_int64   (1));
-  EXPECT_EQ(503  , message.repeated_uint32  (1));
-  EXPECT_EQ(504  , message.repeated_uint64  (1));
-  EXPECT_EQ(505  , message.repeated_sint32  (1));
-  EXPECT_EQ(506  , message.repeated_sint64  (1));
-  EXPECT_EQ(507  , message.repeated_fixed32 (1));
-  EXPECT_EQ(508  , message.repeated_fixed64 (1));
-  EXPECT_EQ(509  , message.repeated_sfixed32(1));
-  EXPECT_EQ(510  , message.repeated_sfixed64(1));
-  EXPECT_EQ(511  , message.repeated_float   (1));
-  EXPECT_EQ(512  , message.repeated_double  (1));
-  EXPECT_TRUE(     message.repeated_bool    (1));
-  EXPECT_EQ("515", message.repeated_string  (1));
-  EXPECT_EQ("516", message.repeated_bytes   (1));
-
-  EXPECT_EQ(517, message.repeatedgroup           (1).a());
-  EXPECT_EQ(518, message.repeated_nested_message (1).bb());
-  EXPECT_EQ(519, message.repeated_foreign_message(1).c());
-  EXPECT_EQ(520, message.repeated_import_message (1).d());
-  EXPECT_EQ(527, message.repeated_lazy_message   (1).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.repeated_nested_enum (1));
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.repeated_foreign_enum(1));
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.repeated_import_enum (1));
-
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::SetPackedFields(unittest::TestPackedTypes* message) {
-  message->add_packed_int32   (601);
-  message->add_packed_int64   (602);
-  message->add_packed_uint32  (603);
-  message->add_packed_uint64  (604);
-  message->add_packed_sint32  (605);
-  message->add_packed_sint64  (606);
-  message->add_packed_fixed32 (607);
-  message->add_packed_fixed64 (608);
-  message->add_packed_sfixed32(609);
-  message->add_packed_sfixed64(610);
-  message->add_packed_float   (611);
-  message->add_packed_double  (612);
-  message->add_packed_bool    (true);
-  message->add_packed_enum    (unittest::FOREIGN_BAR);
-  // add a second one of each field
-  message->add_packed_int32   (701);
-  message->add_packed_int64   (702);
-  message->add_packed_uint32  (703);
-  message->add_packed_uint64  (704);
-  message->add_packed_sint32  (705);
-  message->add_packed_sint64  (706);
-  message->add_packed_fixed32 (707);
-  message->add_packed_fixed64 (708);
-  message->add_packed_sfixed32(709);
-  message->add_packed_sfixed64(710);
-  message->add_packed_float   (711);
-  message->add_packed_double  (712);
-  message->add_packed_bool    (false);
-  message->add_packed_enum    (unittest::FOREIGN_BAZ);
-}
-
-void TestUtil::SetUnpackedFields(unittest::TestUnpackedTypes* message) {
-  // The values applied here must match those of SetPackedFields.
-
-  message->add_unpacked_int32   (601);
-  message->add_unpacked_int64   (602);
-  message->add_unpacked_uint32  (603);
-  message->add_unpacked_uint64  (604);
-  message->add_unpacked_sint32  (605);
-  message->add_unpacked_sint64  (606);
-  message->add_unpacked_fixed32 (607);
-  message->add_unpacked_fixed64 (608);
-  message->add_unpacked_sfixed32(609);
-  message->add_unpacked_sfixed64(610);
-  message->add_unpacked_float   (611);
-  message->add_unpacked_double  (612);
-  message->add_unpacked_bool    (true);
-  message->add_unpacked_enum    (unittest::FOREIGN_BAR);
-  // add a second one of each field
-  message->add_unpacked_int32   (701);
-  message->add_unpacked_int64   (702);
-  message->add_unpacked_uint32  (703);
-  message->add_unpacked_uint64  (704);
-  message->add_unpacked_sint32  (705);
-  message->add_unpacked_sint64  (706);
-  message->add_unpacked_fixed32 (707);
-  message->add_unpacked_fixed64 (708);
-  message->add_unpacked_sfixed32(709);
-  message->add_unpacked_sfixed64(710);
-  message->add_unpacked_float   (711);
-  message->add_unpacked_double  (712);
-  message->add_unpacked_bool    (false);
-  message->add_unpacked_enum    (unittest::FOREIGN_BAZ);
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ModifyPackedFields(unittest::TestPackedTypes* message) {
-  message->set_packed_int32   (1, 801);
-  message->set_packed_int64   (1, 802);
-  message->set_packed_uint32  (1, 803);
-  message->set_packed_uint64  (1, 804);
-  message->set_packed_sint32  (1, 805);
-  message->set_packed_sint64  (1, 806);
-  message->set_packed_fixed32 (1, 807);
-  message->set_packed_fixed64 (1, 808);
-  message->set_packed_sfixed32(1, 809);
-  message->set_packed_sfixed64(1, 810);
-  message->set_packed_float   (1, 811);
-  message->set_packed_double  (1, 812);
-  message->set_packed_bool    (1, true);
-  message->set_packed_enum    (1, unittest::FOREIGN_FOO);
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedFieldsSet(const unittest::TestPackedTypes& message) {
-  ASSERT_EQ(2, message.packed_int32_size   ());
-  ASSERT_EQ(2, message.packed_int64_size   ());
-  ASSERT_EQ(2, message.packed_uint32_size  ());
-  ASSERT_EQ(2, message.packed_uint64_size  ());
-  ASSERT_EQ(2, message.packed_sint32_size  ());
-  ASSERT_EQ(2, message.packed_sint64_size  ());
-  ASSERT_EQ(2, message.packed_fixed32_size ());
-  ASSERT_EQ(2, message.packed_fixed64_size ());
-  ASSERT_EQ(2, message.packed_sfixed32_size());
-  ASSERT_EQ(2, message.packed_sfixed64_size());
-  ASSERT_EQ(2, message.packed_float_size   ());
-  ASSERT_EQ(2, message.packed_double_size  ());
-  ASSERT_EQ(2, message.packed_bool_size    ());
-  ASSERT_EQ(2, message.packed_enum_size    ());
-
-  EXPECT_EQ(601  , message.packed_int32   (0));
-  EXPECT_EQ(602  , message.packed_int64   (0));
-  EXPECT_EQ(603  , message.packed_uint32  (0));
-  EXPECT_EQ(604  , message.packed_uint64  (0));
-  EXPECT_EQ(605  , message.packed_sint32  (0));
-  EXPECT_EQ(606  , message.packed_sint64  (0));
-  EXPECT_EQ(607  , message.packed_fixed32 (0));
-  EXPECT_EQ(608  , message.packed_fixed64 (0));
-  EXPECT_EQ(609  , message.packed_sfixed32(0));
-  EXPECT_EQ(610  , message.packed_sfixed64(0));
-  EXPECT_EQ(611  , message.packed_float   (0));
-  EXPECT_EQ(612  , message.packed_double  (0));
-  EXPECT_TRUE(     message.packed_bool    (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR, message.packed_enum(0));
-
-  EXPECT_EQ(701  , message.packed_int32   (1));
-  EXPECT_EQ(702  , message.packed_int64   (1));
-  EXPECT_EQ(703  , message.packed_uint32  (1));
-  EXPECT_EQ(704  , message.packed_uint64  (1));
-  EXPECT_EQ(705  , message.packed_sint32  (1));
-  EXPECT_EQ(706  , message.packed_sint64  (1));
-  EXPECT_EQ(707  , message.packed_fixed32 (1));
-  EXPECT_EQ(708  , message.packed_fixed64 (1));
-  EXPECT_EQ(709  , message.packed_sfixed32(1));
-  EXPECT_EQ(710  , message.packed_sfixed64(1));
-  EXPECT_EQ(711  , message.packed_float   (1));
-  EXPECT_EQ(712  , message.packed_double  (1));
-  EXPECT_FALSE(    message.packed_bool    (1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ, message.packed_enum(1));
-}
-
-void TestUtil::ExpectUnpackedFieldsSet(
-    const unittest::TestUnpackedTypes& message) {
-  // The values expected here must match those of ExpectPackedFieldsSet.
-
-  ASSERT_EQ(2, message.unpacked_int32_size   ());
-  ASSERT_EQ(2, message.unpacked_int64_size   ());
-  ASSERT_EQ(2, message.unpacked_uint32_size  ());
-  ASSERT_EQ(2, message.unpacked_uint64_size  ());
-  ASSERT_EQ(2, message.unpacked_sint32_size  ());
-  ASSERT_EQ(2, message.unpacked_sint64_size  ());
-  ASSERT_EQ(2, message.unpacked_fixed32_size ());
-  ASSERT_EQ(2, message.unpacked_fixed64_size ());
-  ASSERT_EQ(2, message.unpacked_sfixed32_size());
-  ASSERT_EQ(2, message.unpacked_sfixed64_size());
-  ASSERT_EQ(2, message.unpacked_float_size   ());
-  ASSERT_EQ(2, message.unpacked_double_size  ());
-  ASSERT_EQ(2, message.unpacked_bool_size    ());
-  ASSERT_EQ(2, message.unpacked_enum_size    ());
-
-  EXPECT_EQ(601  , message.unpacked_int32   (0));
-  EXPECT_EQ(602  , message.unpacked_int64   (0));
-  EXPECT_EQ(603  , message.unpacked_uint32  (0));
-  EXPECT_EQ(604  , message.unpacked_uint64  (0));
-  EXPECT_EQ(605  , message.unpacked_sint32  (0));
-  EXPECT_EQ(606  , message.unpacked_sint64  (0));
-  EXPECT_EQ(607  , message.unpacked_fixed32 (0));
-  EXPECT_EQ(608  , message.unpacked_fixed64 (0));
-  EXPECT_EQ(609  , message.unpacked_sfixed32(0));
-  EXPECT_EQ(610  , message.unpacked_sfixed64(0));
-  EXPECT_EQ(611  , message.unpacked_float   (0));
-  EXPECT_EQ(612  , message.unpacked_double  (0));
-  EXPECT_TRUE(     message.unpacked_bool    (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR, message.unpacked_enum(0));
-
-  EXPECT_EQ(701  , message.unpacked_int32   (1));
-  EXPECT_EQ(702  , message.unpacked_int64   (1));
-  EXPECT_EQ(703  , message.unpacked_uint32  (1));
-  EXPECT_EQ(704  , message.unpacked_uint64  (1));
-  EXPECT_EQ(705  , message.unpacked_sint32  (1));
-  EXPECT_EQ(706  , message.unpacked_sint64  (1));
-  EXPECT_EQ(707  , message.unpacked_fixed32 (1));
-  EXPECT_EQ(708  , message.unpacked_fixed64 (1));
-  EXPECT_EQ(709  , message.unpacked_sfixed32(1));
-  EXPECT_EQ(710  , message.unpacked_sfixed64(1));
-  EXPECT_EQ(711  , message.unpacked_float   (1));
-  EXPECT_EQ(712  , message.unpacked_double  (1));
-  EXPECT_FALSE(    message.unpacked_bool    (1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ, message.unpacked_enum(1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedClear(
-    const unittest::TestPackedTypes& message) {
-  // Packed repeated fields are empty.
-  EXPECT_EQ(0, message.packed_int32_size   ());
-  EXPECT_EQ(0, message.packed_int64_size   ());
-  EXPECT_EQ(0, message.packed_uint32_size  ());
-  EXPECT_EQ(0, message.packed_uint64_size  ());
-  EXPECT_EQ(0, message.packed_sint32_size  ());
-  EXPECT_EQ(0, message.packed_sint64_size  ());
-  EXPECT_EQ(0, message.packed_fixed32_size ());
-  EXPECT_EQ(0, message.packed_fixed64_size ());
-  EXPECT_EQ(0, message.packed_sfixed32_size());
-  EXPECT_EQ(0, message.packed_sfixed64_size());
-  EXPECT_EQ(0, message.packed_float_size   ());
-  EXPECT_EQ(0, message.packed_double_size  ());
-  EXPECT_EQ(0, message.packed_bool_size    ());
-  EXPECT_EQ(0, message.packed_enum_size    ());
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedFieldsModified(
-    const unittest::TestPackedTypes& message) {
-  // Do the same for packed repeated fields.
-  ASSERT_EQ(2, message.packed_int32_size   ());
-  ASSERT_EQ(2, message.packed_int64_size   ());
-  ASSERT_EQ(2, message.packed_uint32_size  ());
-  ASSERT_EQ(2, message.packed_uint64_size  ());
-  ASSERT_EQ(2, message.packed_sint32_size  ());
-  ASSERT_EQ(2, message.packed_sint64_size  ());
-  ASSERT_EQ(2, message.packed_fixed32_size ());
-  ASSERT_EQ(2, message.packed_fixed64_size ());
-  ASSERT_EQ(2, message.packed_sfixed32_size());
-  ASSERT_EQ(2, message.packed_sfixed64_size());
-  ASSERT_EQ(2, message.packed_float_size   ());
-  ASSERT_EQ(2, message.packed_double_size  ());
-  ASSERT_EQ(2, message.packed_bool_size    ());
-  ASSERT_EQ(2, message.packed_enum_size    ());
-
-  EXPECT_EQ(601  , message.packed_int32   (0));
-  EXPECT_EQ(602  , message.packed_int64   (0));
-  EXPECT_EQ(603  , message.packed_uint32  (0));
-  EXPECT_EQ(604  , message.packed_uint64  (0));
-  EXPECT_EQ(605  , message.packed_sint32  (0));
-  EXPECT_EQ(606  , message.packed_sint64  (0));
-  EXPECT_EQ(607  , message.packed_fixed32 (0));
-  EXPECT_EQ(608  , message.packed_fixed64 (0));
-  EXPECT_EQ(609  , message.packed_sfixed32(0));
-  EXPECT_EQ(610  , message.packed_sfixed64(0));
-  EXPECT_EQ(611  , message.packed_float   (0));
-  EXPECT_EQ(612  , message.packed_double  (0));
-  EXPECT_TRUE(     message.packed_bool    (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR, message.packed_enum(0));
-  // Actually verify the second (modified) elements now.
-  EXPECT_EQ(801  , message.packed_int32   (1));
-  EXPECT_EQ(802  , message.packed_int64   (1));
-  EXPECT_EQ(803  , message.packed_uint32  (1));
-  EXPECT_EQ(804  , message.packed_uint64  (1));
-  EXPECT_EQ(805  , message.packed_sint32  (1));
-  EXPECT_EQ(806  , message.packed_sint64  (1));
-  EXPECT_EQ(807  , message.packed_fixed32 (1));
-  EXPECT_EQ(808  , message.packed_fixed64 (1));
-  EXPECT_EQ(809  , message.packed_sfixed32(1));
-  EXPECT_EQ(810  , message.packed_sfixed64(1));
-  EXPECT_EQ(811  , message.packed_float   (1));
-  EXPECT_EQ(812  , message.packed_double  (1));
-  EXPECT_TRUE(     message.packed_bool    (1));
-  EXPECT_EQ(unittest::FOREIGN_FOO, message.packed_enum(1));
-}
-
-// ===================================================================
-// Extensions
-//
-// All this code is exactly equivalent to the above code except that it's
-// manipulating extension fields instead of normal ones.
-//
-// I gave up on the 80-char limit here.  Sorry.
-
-void TestUtil::SetAllExtensions(unittest::TestAllExtensions* message) {
-  message->SetExtension(unittest::optional_int32_extension   , 101);
-  message->SetExtension(unittest::optional_int64_extension   , 102);
-  message->SetExtension(unittest::optional_uint32_extension  , 103);
-  message->SetExtension(unittest::optional_uint64_extension  , 104);
-  message->SetExtension(unittest::optional_sint32_extension  , 105);
-  message->SetExtension(unittest::optional_sint64_extension  , 106);
-  message->SetExtension(unittest::optional_fixed32_extension , 107);
-  message->SetExtension(unittest::optional_fixed64_extension , 108);
-  message->SetExtension(unittest::optional_sfixed32_extension, 109);
-  message->SetExtension(unittest::optional_sfixed64_extension, 110);
-  message->SetExtension(unittest::optional_float_extension   , 111);
-  message->SetExtension(unittest::optional_double_extension  , 112);
-  message->SetExtension(unittest::optional_bool_extension    , true);
-  message->SetExtension(unittest::optional_string_extension  , "115");
-  message->SetExtension(unittest::optional_bytes_extension   , "116");
-
-  message->MutableExtension(unittest::optionalgroup_extension           )->set_a(117);
-  message->MutableExtension(unittest::optional_nested_message_extension )->set_bb(118);
-  message->MutableExtension(unittest::optional_foreign_message_extension)->set_c(119);
-  message->MutableExtension(unittest::optional_import_message_extension )->set_d(120);
-
-  message->SetExtension(unittest::optional_nested_enum_extension , unittest::TestAllTypes::BAZ);
-  message->SetExtension(unittest::optional_foreign_enum_extension, unittest::FOREIGN_BAZ      );
-  message->SetExtension(unittest::optional_import_enum_extension , unittest_import::IMPORT_BAZ);
-
-  message->SetExtension(unittest::optional_string_piece_extension, "124");
-  message->SetExtension(unittest::optional_cord_extension, "125");
-
-  message->MutableExtension(unittest::optional_public_import_message_extension)->set_e(126);
-  message->MutableExtension(unittest::optional_lazy_message_extension)->set_bb(127);
-
-  // -----------------------------------------------------------------
-
-  message->AddExtension(unittest::repeated_int32_extension   , 201);
-  message->AddExtension(unittest::repeated_int64_extension   , 202);
-  message->AddExtension(unittest::repeated_uint32_extension  , 203);
-  message->AddExtension(unittest::repeated_uint64_extension  , 204);
-  message->AddExtension(unittest::repeated_sint32_extension  , 205);
-  message->AddExtension(unittest::repeated_sint64_extension  , 206);
-  message->AddExtension(unittest::repeated_fixed32_extension , 207);
-  message->AddExtension(unittest::repeated_fixed64_extension , 208);
-  message->AddExtension(unittest::repeated_sfixed32_extension, 209);
-  message->AddExtension(unittest::repeated_sfixed64_extension, 210);
-  message->AddExtension(unittest::repeated_float_extension   , 211);
-  message->AddExtension(unittest::repeated_double_extension  , 212);
-  message->AddExtension(unittest::repeated_bool_extension    , true);
-  message->AddExtension(unittest::repeated_string_extension  , "215");
-  message->AddExtension(unittest::repeated_bytes_extension   , "216");
-
-  message->AddExtension(unittest::repeatedgroup_extension           )->set_a(217);
-  message->AddExtension(unittest::repeated_nested_message_extension )->set_bb(218);
-  message->AddExtension(unittest::repeated_foreign_message_extension)->set_c(219);
-  message->AddExtension(unittest::repeated_import_message_extension )->set_d(220);
-  message->AddExtension(unittest::repeated_lazy_message_extension   )->set_bb(227);
-
-  message->AddExtension(unittest::repeated_nested_enum_extension , unittest::TestAllTypes::BAR);
-  message->AddExtension(unittest::repeated_foreign_enum_extension, unittest::FOREIGN_BAR      );
-  message->AddExtension(unittest::repeated_import_enum_extension , unittest_import::IMPORT_BAR);
-
-  message->AddExtension(unittest::repeated_string_piece_extension, "224");
-  message->AddExtension(unittest::repeated_cord_extension, "225");
-
-  // Add a second one of each field.
-  message->AddExtension(unittest::repeated_int32_extension   , 301);
-  message->AddExtension(unittest::repeated_int64_extension   , 302);
-  message->AddExtension(unittest::repeated_uint32_extension  , 303);
-  message->AddExtension(unittest::repeated_uint64_extension  , 304);
-  message->AddExtension(unittest::repeated_sint32_extension  , 305);
-  message->AddExtension(unittest::repeated_sint64_extension  , 306);
-  message->AddExtension(unittest::repeated_fixed32_extension , 307);
-  message->AddExtension(unittest::repeated_fixed64_extension , 308);
-  message->AddExtension(unittest::repeated_sfixed32_extension, 309);
-  message->AddExtension(unittest::repeated_sfixed64_extension, 310);
-  message->AddExtension(unittest::repeated_float_extension   , 311);
-  message->AddExtension(unittest::repeated_double_extension  , 312);
-  message->AddExtension(unittest::repeated_bool_extension    , false);
-  message->AddExtension(unittest::repeated_string_extension  , "315");
-  message->AddExtension(unittest::repeated_bytes_extension   , "316");
-
-  message->AddExtension(unittest::repeatedgroup_extension           )->set_a(317);
-  message->AddExtension(unittest::repeated_nested_message_extension )->set_bb(318);
-  message->AddExtension(unittest::repeated_foreign_message_extension)->set_c(319);
-  message->AddExtension(unittest::repeated_import_message_extension )->set_d(320);
-  message->AddExtension(unittest::repeated_lazy_message_extension   )->set_bb(327);
-
-  message->AddExtension(unittest::repeated_nested_enum_extension , unittest::TestAllTypes::BAZ);
-  message->AddExtension(unittest::repeated_foreign_enum_extension, unittest::FOREIGN_BAZ      );
-  message->AddExtension(unittest::repeated_import_enum_extension , unittest_import::IMPORT_BAZ);
-
-  message->AddExtension(unittest::repeated_string_piece_extension, "324");
-  message->AddExtension(unittest::repeated_cord_extension, "325");
-
-  // -----------------------------------------------------------------
-
-  message->SetExtension(unittest::default_int32_extension   , 401);
-  message->SetExtension(unittest::default_int64_extension   , 402);
-  message->SetExtension(unittest::default_uint32_extension  , 403);
-  message->SetExtension(unittest::default_uint64_extension  , 404);
-  message->SetExtension(unittest::default_sint32_extension  , 405);
-  message->SetExtension(unittest::default_sint64_extension  , 406);
-  message->SetExtension(unittest::default_fixed32_extension , 407);
-  message->SetExtension(unittest::default_fixed64_extension , 408);
-  message->SetExtension(unittest::default_sfixed32_extension, 409);
-  message->SetExtension(unittest::default_sfixed64_extension, 410);
-  message->SetExtension(unittest::default_float_extension   , 411);
-  message->SetExtension(unittest::default_double_extension  , 412);
-  message->SetExtension(unittest::default_bool_extension    , false);
-  message->SetExtension(unittest::default_string_extension  , "415");
-  message->SetExtension(unittest::default_bytes_extension   , "416");
-
-  message->SetExtension(unittest::default_nested_enum_extension , unittest::TestAllTypes::FOO);
-  message->SetExtension(unittest::default_foreign_enum_extension, unittest::FOREIGN_FOO      );
-  message->SetExtension(unittest::default_import_enum_extension , unittest_import::IMPORT_FOO);
-
-  message->SetExtension(unittest::default_string_piece_extension, "424");
-  message->SetExtension(unittest::default_cord_extension, "425");
-
-  SetOneofFields(message);
-}
-
-void TestUtil::SetOneofFields(unittest::TestAllExtensions* message) {
-  message->SetExtension(unittest::oneof_uint32_extension, 601);
-  message->MutableExtension(unittest::oneof_nested_message_extension)->set_bb(602);
-  message->SetExtension(unittest::oneof_string_extension, "603");
-  message->SetExtension(unittest::oneof_bytes_extension, "604");
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::SetAllFieldsAndExtensions(
-    unittest::TestFieldOrderings* message) {
-  GOOGLE_CHECK(message);
-  message->set_my_int(1);
-  message->set_my_string("foo");
-  message->set_my_float(1.0);
-  message->SetExtension(unittest::my_extension_int, 23);
-  message->SetExtension(unittest::my_extension_string, "bar");
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ModifyRepeatedExtensions(unittest::TestAllExtensions* message) {
-  message->SetExtension(unittest::repeated_int32_extension   , 1, 501);
-  message->SetExtension(unittest::repeated_int64_extension   , 1, 502);
-  message->SetExtension(unittest::repeated_uint32_extension  , 1, 503);
-  message->SetExtension(unittest::repeated_uint64_extension  , 1, 504);
-  message->SetExtension(unittest::repeated_sint32_extension  , 1, 505);
-  message->SetExtension(unittest::repeated_sint64_extension  , 1, 506);
-  message->SetExtension(unittest::repeated_fixed32_extension , 1, 507);
-  message->SetExtension(unittest::repeated_fixed64_extension , 1, 508);
-  message->SetExtension(unittest::repeated_sfixed32_extension, 1, 509);
-  message->SetExtension(unittest::repeated_sfixed64_extension, 1, 510);
-  message->SetExtension(unittest::repeated_float_extension   , 1, 511);
-  message->SetExtension(unittest::repeated_double_extension  , 1, 512);
-  message->SetExtension(unittest::repeated_bool_extension    , 1, true);
-  message->SetExtension(unittest::repeated_string_extension  , 1, "515");
-  message->SetExtension(unittest::repeated_bytes_extension   , 1, "516");
-
-  message->MutableExtension(unittest::repeatedgroup_extension           , 1)->set_a(517);
-  message->MutableExtension(unittest::repeated_nested_message_extension , 1)->set_bb(518);
-  message->MutableExtension(unittest::repeated_foreign_message_extension, 1)->set_c(519);
-  message->MutableExtension(unittest::repeated_import_message_extension , 1)->set_d(520);
-  message->MutableExtension(unittest::repeated_lazy_message_extension   , 1)->set_bb(527);
-
-  message->SetExtension(unittest::repeated_nested_enum_extension , 1, unittest::TestAllTypes::FOO);
-  message->SetExtension(unittest::repeated_foreign_enum_extension, 1, unittest::FOREIGN_FOO      );
-  message->SetExtension(unittest::repeated_import_enum_extension , 1, unittest_import::IMPORT_FOO);
-
-  message->SetExtension(unittest::repeated_string_piece_extension, 1, "524");
-  message->SetExtension(unittest::repeated_cord_extension, 1, "525");
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectAllExtensionsSet(
-    const unittest::TestAllExtensions& message) {
-  EXPECT_TRUE(message.HasExtension(unittest::optional_int32_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_int64_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_uint32_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_uint64_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_sint32_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_sint64_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_fixed32_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_fixed64_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_sfixed32_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_sfixed64_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_float_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_double_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_bool_extension    ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_string_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_bytes_extension   ));
-
-  EXPECT_TRUE(message.HasExtension(unittest::optionalgroup_extension                 ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_nested_message_extension       ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_foreign_message_extension      ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_import_message_extension       ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_public_import_message_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_lazy_message_extension         ));
-
-  EXPECT_TRUE(message.GetExtension(unittest::optionalgroup_extension                 ).has_a());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_nested_message_extension       ).has_bb());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_foreign_message_extension      ).has_c());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_import_message_extension       ).has_d());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_public_import_message_extension).has_e());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_lazy_message_extension         ).has_bb());
-
-  EXPECT_TRUE(message.HasExtension(unittest::optional_nested_enum_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_foreign_enum_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_import_enum_extension ));
-
-  EXPECT_TRUE(message.HasExtension(unittest::optional_string_piece_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_cord_extension));
-
-  EXPECT_EQ(101  , message.GetExtension(unittest::optional_int32_extension   ));
-  EXPECT_EQ(102  , message.GetExtension(unittest::optional_int64_extension   ));
-  EXPECT_EQ(103  , message.GetExtension(unittest::optional_uint32_extension  ));
-  EXPECT_EQ(104  , message.GetExtension(unittest::optional_uint64_extension  ));
-  EXPECT_EQ(105  , message.GetExtension(unittest::optional_sint32_extension  ));
-  EXPECT_EQ(106  , message.GetExtension(unittest::optional_sint64_extension  ));
-  EXPECT_EQ(107  , message.GetExtension(unittest::optional_fixed32_extension ));
-  EXPECT_EQ(108  , message.GetExtension(unittest::optional_fixed64_extension ));
-  EXPECT_EQ(109  , message.GetExtension(unittest::optional_sfixed32_extension));
-  EXPECT_EQ(110  , message.GetExtension(unittest::optional_sfixed64_extension));
-  EXPECT_EQ(111  , message.GetExtension(unittest::optional_float_extension   ));
-  EXPECT_EQ(112  , message.GetExtension(unittest::optional_double_extension  ));
-  EXPECT_TRUE(     message.GetExtension(unittest::optional_bool_extension    ));
-  EXPECT_EQ("115", message.GetExtension(unittest::optional_string_extension  ));
-  EXPECT_EQ("116", message.GetExtension(unittest::optional_bytes_extension   ));
-
-  EXPECT_EQ(117, message.GetExtension(unittest::optionalgroup_extension           ).a());
-  EXPECT_EQ(118, message.GetExtension(unittest::optional_nested_message_extension ).bb());
-  EXPECT_EQ(119, message.GetExtension(unittest::optional_foreign_message_extension).c());
-  EXPECT_EQ(120, message.GetExtension(unittest::optional_import_message_extension ).d());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.GetExtension(unittest::optional_nested_enum_extension ));
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.GetExtension(unittest::optional_foreign_enum_extension));
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.GetExtension(unittest::optional_import_enum_extension ));
-
-  EXPECT_EQ("124", message.GetExtension(unittest::optional_string_piece_extension));
-  EXPECT_EQ("125", message.GetExtension(unittest::optional_cord_extension));
-  EXPECT_EQ(126, message.GetExtension(unittest::optional_public_import_message_extension ).e());
-  EXPECT_EQ(127, message.GetExtension(unittest::optional_lazy_message_extension).bb());
-
-  // -----------------------------------------------------------------
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bytes_extension   ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_piece_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_cord_extension));
-
-  EXPECT_EQ(201  , message.GetExtension(unittest::repeated_int32_extension   , 0));
-  EXPECT_EQ(202  , message.GetExtension(unittest::repeated_int64_extension   , 0));
-  EXPECT_EQ(203  , message.GetExtension(unittest::repeated_uint32_extension  , 0));
-  EXPECT_EQ(204  , message.GetExtension(unittest::repeated_uint64_extension  , 0));
-  EXPECT_EQ(205  , message.GetExtension(unittest::repeated_sint32_extension  , 0));
-  EXPECT_EQ(206  , message.GetExtension(unittest::repeated_sint64_extension  , 0));
-  EXPECT_EQ(207  , message.GetExtension(unittest::repeated_fixed32_extension , 0));
-  EXPECT_EQ(208  , message.GetExtension(unittest::repeated_fixed64_extension , 0));
-  EXPECT_EQ(209  , message.GetExtension(unittest::repeated_sfixed32_extension, 0));
-  EXPECT_EQ(210  , message.GetExtension(unittest::repeated_sfixed64_extension, 0));
-  EXPECT_EQ(211  , message.GetExtension(unittest::repeated_float_extension   , 0));
-  EXPECT_EQ(212  , message.GetExtension(unittest::repeated_double_extension  , 0));
-  EXPECT_TRUE(     message.GetExtension(unittest::repeated_bool_extension    , 0));
-  EXPECT_EQ("215", message.GetExtension(unittest::repeated_string_extension  , 0));
-  EXPECT_EQ("216", message.GetExtension(unittest::repeated_bytes_extension   , 0));
-
-  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
-  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
-  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
-  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
-  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.GetExtension(unittest::repeated_import_enum_extension , 0));
-
-  EXPECT_EQ("224", message.GetExtension(unittest::repeated_string_piece_extension, 0));
-  EXPECT_EQ("225", message.GetExtension(unittest::repeated_cord_extension, 0));
-
-  EXPECT_EQ(301  , message.GetExtension(unittest::repeated_int32_extension   , 1));
-  EXPECT_EQ(302  , message.GetExtension(unittest::repeated_int64_extension   , 1));
-  EXPECT_EQ(303  , message.GetExtension(unittest::repeated_uint32_extension  , 1));
-  EXPECT_EQ(304  , message.GetExtension(unittest::repeated_uint64_extension  , 1));
-  EXPECT_EQ(305  , message.GetExtension(unittest::repeated_sint32_extension  , 1));
-  EXPECT_EQ(306  , message.GetExtension(unittest::repeated_sint64_extension  , 1));
-  EXPECT_EQ(307  , message.GetExtension(unittest::repeated_fixed32_extension , 1));
-  EXPECT_EQ(308  , message.GetExtension(unittest::repeated_fixed64_extension , 1));
-  EXPECT_EQ(309  , message.GetExtension(unittest::repeated_sfixed32_extension, 1));
-  EXPECT_EQ(310  , message.GetExtension(unittest::repeated_sfixed64_extension, 1));
-  EXPECT_EQ(311  , message.GetExtension(unittest::repeated_float_extension   , 1));
-  EXPECT_EQ(312  , message.GetExtension(unittest::repeated_double_extension  , 1));
-  EXPECT_FALSE(    message.GetExtension(unittest::repeated_bool_extension    , 1));
-  EXPECT_EQ("315", message.GetExtension(unittest::repeated_string_extension  , 1));
-  EXPECT_EQ("316", message.GetExtension(unittest::repeated_bytes_extension   , 1));
-
-  EXPECT_EQ(317, message.GetExtension(unittest::repeatedgroup_extension           , 1).a());
-  EXPECT_EQ(318, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
-  EXPECT_EQ(319, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
-  EXPECT_EQ(320, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
-  EXPECT_EQ(327, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.GetExtension(unittest::repeated_import_enum_extension , 1));
-
-  EXPECT_EQ("324", message.GetExtension(unittest::repeated_string_piece_extension, 1));
-  EXPECT_EQ("325", message.GetExtension(unittest::repeated_cord_extension, 1));
-
-  // -----------------------------------------------------------------
-
-  EXPECT_TRUE(message.HasExtension(unittest::default_int32_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_int64_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_uint32_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_uint64_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_sint32_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_sint64_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_fixed32_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_fixed64_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_sfixed32_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::default_sfixed64_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::default_float_extension   ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_double_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_bool_extension    ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_string_extension  ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_bytes_extension   ));
-
-  EXPECT_TRUE(message.HasExtension(unittest::default_nested_enum_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::default_foreign_enum_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::default_import_enum_extension ));
-
-  EXPECT_TRUE(message.HasExtension(unittest::default_string_piece_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::default_cord_extension));
-
-  EXPECT_EQ(401  , message.GetExtension(unittest::default_int32_extension   ));
-  EXPECT_EQ(402  , message.GetExtension(unittest::default_int64_extension   ));
-  EXPECT_EQ(403  , message.GetExtension(unittest::default_uint32_extension  ));
-  EXPECT_EQ(404  , message.GetExtension(unittest::default_uint64_extension  ));
-  EXPECT_EQ(405  , message.GetExtension(unittest::default_sint32_extension  ));
-  EXPECT_EQ(406  , message.GetExtension(unittest::default_sint64_extension  ));
-  EXPECT_EQ(407  , message.GetExtension(unittest::default_fixed32_extension ));
-  EXPECT_EQ(408  , message.GetExtension(unittest::default_fixed64_extension ));
-  EXPECT_EQ(409  , message.GetExtension(unittest::default_sfixed32_extension));
-  EXPECT_EQ(410  , message.GetExtension(unittest::default_sfixed64_extension));
-  EXPECT_EQ(411  , message.GetExtension(unittest::default_float_extension   ));
-  EXPECT_EQ(412  , message.GetExtension(unittest::default_double_extension  ));
-  EXPECT_FALSE(    message.GetExtension(unittest::default_bool_extension    ));
-  EXPECT_EQ("415", message.GetExtension(unittest::default_string_extension  ));
-  EXPECT_EQ("416", message.GetExtension(unittest::default_bytes_extension   ));
-
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.GetExtension(unittest::default_nested_enum_extension ));
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.GetExtension(unittest::default_foreign_enum_extension));
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.GetExtension(unittest::default_import_enum_extension ));
-
-  EXPECT_EQ("424", message.GetExtension(unittest::default_string_piece_extension));
-  EXPECT_EQ("425", message.GetExtension(unittest::default_cord_extension));
-
-  EXPECT_TRUE(message.HasExtension(unittest::oneof_uint32_extension));
-  EXPECT_TRUE(message.GetExtension(unittest::oneof_nested_message_extension).has_bb());
-  EXPECT_TRUE(message.HasExtension(unittest::oneof_string_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::oneof_bytes_extension));
-
-  EXPECT_EQ(601, message.GetExtension(unittest::oneof_uint32_extension));
-  EXPECT_EQ(602, message.GetExtension(unittest::oneof_nested_message_extension).bb());
-  EXPECT_EQ("603", message.GetExtension(unittest::oneof_string_extension));
-  EXPECT_EQ("604", message.GetExtension(unittest::oneof_bytes_extension));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectExtensionsClear(
-    const unittest::TestAllExtensions& message) {
-  string serialized;
-  ASSERT_TRUE(message.SerializeToString(&serialized));
-  EXPECT_EQ("", serialized);
-  EXPECT_EQ(0, message.ByteSize());
-
-  // has_blah() should initially be false for all optional fields.
-  EXPECT_FALSE(message.HasExtension(unittest::optional_int32_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_int64_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_uint32_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_uint64_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_sint32_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_sint64_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_fixed32_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_fixed64_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_sfixed32_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_sfixed64_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_float_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_double_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_bool_extension    ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_string_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_bytes_extension   ));
-
-  EXPECT_FALSE(message.HasExtension(unittest::optionalgroup_extension                 ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_nested_message_extension       ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_foreign_message_extension      ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_import_message_extension       ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_public_import_message_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_lazy_message_extension         ));
-
-  EXPECT_FALSE(message.HasExtension(unittest::optional_nested_enum_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_foreign_enum_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_import_enum_extension ));
-
-  EXPECT_FALSE(message.HasExtension(unittest::optional_string_piece_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_cord_extension));
-
-  // Optional fields without defaults are set to zero or something like it.
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_int32_extension   ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_int64_extension   ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_uint32_extension  ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_uint64_extension  ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_sint32_extension  ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_sint64_extension  ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_fixed32_extension ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_fixed64_extension ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_sfixed32_extension));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_sfixed64_extension));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_float_extension   ));
-  EXPECT_EQ(0    , message.GetExtension(unittest::optional_double_extension  ));
-  EXPECT_FALSE(    message.GetExtension(unittest::optional_bool_extension    ));
-  EXPECT_EQ(""   , message.GetExtension(unittest::optional_string_extension  ));
-  EXPECT_EQ(""   , message.GetExtension(unittest::optional_bytes_extension   ));
-
-  // Embedded messages should also be clear.
-  EXPECT_FALSE(message.GetExtension(unittest::optionalgroup_extension                 ).has_a());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_nested_message_extension       ).has_bb());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_foreign_message_extension      ).has_c());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_import_message_extension       ).has_d());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_public_import_message_extension).has_e());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_lazy_message_extension         ).has_bb());
-
-  EXPECT_EQ(0, message.GetExtension(unittest::optionalgroup_extension                 ).a());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_nested_message_extension       ).bb());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_foreign_message_extension      ).c());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_import_message_extension       ).d());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_public_import_message_extension).e());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_lazy_message_extension         ).bb());
-
-  // Enums without defaults are set to the first value in the enum.
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.GetExtension(unittest::optional_nested_enum_extension ));
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.GetExtension(unittest::optional_foreign_enum_extension));
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.GetExtension(unittest::optional_import_enum_extension ));
-
-  EXPECT_EQ("", message.GetExtension(unittest::optional_string_piece_extension));
-  EXPECT_EQ("", message.GetExtension(unittest::optional_cord_extension));
-
-  // Repeated fields are empty.
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_int32_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_int64_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_uint32_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_uint64_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_sint32_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_sint64_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_fixed32_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_fixed64_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_sfixed32_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_sfixed64_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_float_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_double_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_bool_extension    ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_string_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_bytes_extension   ));
-
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
-
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_string_piece_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_cord_extension));
-
-  // has_blah() should also be false for all default fields.
-  EXPECT_FALSE(message.HasExtension(unittest::default_int32_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_int64_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_uint32_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_uint64_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_sint32_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_sint64_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_fixed32_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_fixed64_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_sfixed32_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::default_sfixed64_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::default_float_extension   ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_double_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_bool_extension    ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_string_extension  ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_bytes_extension   ));
-
-  EXPECT_FALSE(message.HasExtension(unittest::default_nested_enum_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::default_foreign_enum_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::default_import_enum_extension ));
-
-  EXPECT_FALSE(message.HasExtension(unittest::default_string_piece_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::default_cord_extension));
-
-  // Fields with defaults have their default values (duh).
-  EXPECT_EQ( 41    , message.GetExtension(unittest::default_int32_extension   ));
-  EXPECT_EQ( 42    , message.GetExtension(unittest::default_int64_extension   ));
-  EXPECT_EQ( 43    , message.GetExtension(unittest::default_uint32_extension  ));
-  EXPECT_EQ( 44    , message.GetExtension(unittest::default_uint64_extension  ));
-  EXPECT_EQ(-45    , message.GetExtension(unittest::default_sint32_extension  ));
-  EXPECT_EQ( 46    , message.GetExtension(unittest::default_sint64_extension  ));
-  EXPECT_EQ( 47    , message.GetExtension(unittest::default_fixed32_extension ));
-  EXPECT_EQ( 48    , message.GetExtension(unittest::default_fixed64_extension ));
-  EXPECT_EQ( 49    , message.GetExtension(unittest::default_sfixed32_extension));
-  EXPECT_EQ(-50    , message.GetExtension(unittest::default_sfixed64_extension));
-  EXPECT_EQ( 51.5  , message.GetExtension(unittest::default_float_extension   ));
-  EXPECT_EQ( 52e3  , message.GetExtension(unittest::default_double_extension  ));
-  EXPECT_TRUE(       message.GetExtension(unittest::default_bool_extension    ));
-  EXPECT_EQ("hello", message.GetExtension(unittest::default_string_extension  ));
-  EXPECT_EQ("world", message.GetExtension(unittest::default_bytes_extension   ));
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::default_nested_enum_extension ));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::default_foreign_enum_extension));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.GetExtension(unittest::default_import_enum_extension ));
-
-  EXPECT_EQ("abc", message.GetExtension(unittest::default_string_piece_extension));
-  EXPECT_EQ("123", message.GetExtension(unittest::default_cord_extension));
-
-  EXPECT_FALSE(message.HasExtension(unittest::oneof_uint32_extension));
-  EXPECT_FALSE(message.GetExtension(unittest::oneof_nested_message_extension).has_bb());
-  EXPECT_FALSE(message.HasExtension(unittest::oneof_string_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::oneof_bytes_extension));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectRepeatedExtensionsModified(
-    const unittest::TestAllExtensions& message) {
-  // ModifyRepeatedFields only sets the second repeated element of each
-  // field.  In addition to verifying this, we also verify that the first
-  // element and size were *not* modified.
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bytes_extension   ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_piece_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_cord_extension));
-
-  EXPECT_EQ(201  , message.GetExtension(unittest::repeated_int32_extension   , 0));
-  EXPECT_EQ(202  , message.GetExtension(unittest::repeated_int64_extension   , 0));
-  EXPECT_EQ(203  , message.GetExtension(unittest::repeated_uint32_extension  , 0));
-  EXPECT_EQ(204  , message.GetExtension(unittest::repeated_uint64_extension  , 0));
-  EXPECT_EQ(205  , message.GetExtension(unittest::repeated_sint32_extension  , 0));
-  EXPECT_EQ(206  , message.GetExtension(unittest::repeated_sint64_extension  , 0));
-  EXPECT_EQ(207  , message.GetExtension(unittest::repeated_fixed32_extension , 0));
-  EXPECT_EQ(208  , message.GetExtension(unittest::repeated_fixed64_extension , 0));
-  EXPECT_EQ(209  , message.GetExtension(unittest::repeated_sfixed32_extension, 0));
-  EXPECT_EQ(210  , message.GetExtension(unittest::repeated_sfixed64_extension, 0));
-  EXPECT_EQ(211  , message.GetExtension(unittest::repeated_float_extension   , 0));
-  EXPECT_EQ(212  , message.GetExtension(unittest::repeated_double_extension  , 0));
-  EXPECT_TRUE(     message.GetExtension(unittest::repeated_bool_extension    , 0));
-  EXPECT_EQ("215", message.GetExtension(unittest::repeated_string_extension  , 0));
-  EXPECT_EQ("216", message.GetExtension(unittest::repeated_bytes_extension   , 0));
-
-  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
-  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
-  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
-  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
-  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.GetExtension(unittest::repeated_import_enum_extension , 0));
-
-  EXPECT_EQ("224", message.GetExtension(unittest::repeated_string_piece_extension, 0));
-  EXPECT_EQ("225", message.GetExtension(unittest::repeated_cord_extension, 0));
-
-  // Actually verify the second (modified) elements now.
-  EXPECT_EQ(501  , message.GetExtension(unittest::repeated_int32_extension   , 1));
-  EXPECT_EQ(502  , message.GetExtension(unittest::repeated_int64_extension   , 1));
-  EXPECT_EQ(503  , message.GetExtension(unittest::repeated_uint32_extension  , 1));
-  EXPECT_EQ(504  , message.GetExtension(unittest::repeated_uint64_extension  , 1));
-  EXPECT_EQ(505  , message.GetExtension(unittest::repeated_sint32_extension  , 1));
-  EXPECT_EQ(506  , message.GetExtension(unittest::repeated_sint64_extension  , 1));
-  EXPECT_EQ(507  , message.GetExtension(unittest::repeated_fixed32_extension , 1));
-  EXPECT_EQ(508  , message.GetExtension(unittest::repeated_fixed64_extension , 1));
-  EXPECT_EQ(509  , message.GetExtension(unittest::repeated_sfixed32_extension, 1));
-  EXPECT_EQ(510  , message.GetExtension(unittest::repeated_sfixed64_extension, 1));
-  EXPECT_EQ(511  , message.GetExtension(unittest::repeated_float_extension   , 1));
-  EXPECT_EQ(512  , message.GetExtension(unittest::repeated_double_extension  , 1));
-  EXPECT_TRUE(     message.GetExtension(unittest::repeated_bool_extension    , 1));
-  EXPECT_EQ("515", message.GetExtension(unittest::repeated_string_extension  , 1));
-  EXPECT_EQ("516", message.GetExtension(unittest::repeated_bytes_extension   , 1));
-
-  EXPECT_EQ(517, message.GetExtension(unittest::repeatedgroup_extension           , 1).a());
-  EXPECT_EQ(518, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
-  EXPECT_EQ(519, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
-  EXPECT_EQ(520, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
-  EXPECT_EQ(527, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::FOO, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
-  EXPECT_EQ(unittest::FOREIGN_FOO      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
-  EXPECT_EQ(unittest_import::IMPORT_FOO, message.GetExtension(unittest::repeated_import_enum_extension , 1));
-
-  EXPECT_EQ("524", message.GetExtension(unittest::repeated_string_piece_extension, 1));
-  EXPECT_EQ("525", message.GetExtension(unittest::repeated_cord_extension, 1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::SetPackedExtensions(unittest::TestPackedExtensions* message) {
-  message->AddExtension(unittest::packed_int32_extension   , 601);
-  message->AddExtension(unittest::packed_int64_extension   , 602);
-  message->AddExtension(unittest::packed_uint32_extension  , 603);
-  message->AddExtension(unittest::packed_uint64_extension  , 604);
-  message->AddExtension(unittest::packed_sint32_extension  , 605);
-  message->AddExtension(unittest::packed_sint64_extension  , 606);
-  message->AddExtension(unittest::packed_fixed32_extension , 607);
-  message->AddExtension(unittest::packed_fixed64_extension , 608);
-  message->AddExtension(unittest::packed_sfixed32_extension, 609);
-  message->AddExtension(unittest::packed_sfixed64_extension, 610);
-  message->AddExtension(unittest::packed_float_extension   , 611);
-  message->AddExtension(unittest::packed_double_extension  , 612);
-  message->AddExtension(unittest::packed_bool_extension    , true);
-  message->AddExtension(unittest::packed_enum_extension, unittest::FOREIGN_BAR);
-  // add a second one of each field
-  message->AddExtension(unittest::packed_int32_extension   , 701);
-  message->AddExtension(unittest::packed_int64_extension   , 702);
-  message->AddExtension(unittest::packed_uint32_extension  , 703);
-  message->AddExtension(unittest::packed_uint64_extension  , 704);
-  message->AddExtension(unittest::packed_sint32_extension  , 705);
-  message->AddExtension(unittest::packed_sint64_extension  , 706);
-  message->AddExtension(unittest::packed_fixed32_extension , 707);
-  message->AddExtension(unittest::packed_fixed64_extension , 708);
-  message->AddExtension(unittest::packed_sfixed32_extension, 709);
-  message->AddExtension(unittest::packed_sfixed64_extension, 710);
-  message->AddExtension(unittest::packed_float_extension   , 711);
-  message->AddExtension(unittest::packed_double_extension  , 712);
-  message->AddExtension(unittest::packed_bool_extension    , false);
-  message->AddExtension(unittest::packed_enum_extension, unittest::FOREIGN_BAZ);
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ModifyPackedExtensions(unittest::TestPackedExtensions* message) {
-  message->SetExtension(unittest::packed_int32_extension   , 1, 801);
-  message->SetExtension(unittest::packed_int64_extension   , 1, 802);
-  message->SetExtension(unittest::packed_uint32_extension  , 1, 803);
-  message->SetExtension(unittest::packed_uint64_extension  , 1, 804);
-  message->SetExtension(unittest::packed_sint32_extension  , 1, 805);
-  message->SetExtension(unittest::packed_sint64_extension  , 1, 806);
-  message->SetExtension(unittest::packed_fixed32_extension , 1, 807);
-  message->SetExtension(unittest::packed_fixed64_extension , 1, 808);
-  message->SetExtension(unittest::packed_sfixed32_extension, 1, 809);
-  message->SetExtension(unittest::packed_sfixed64_extension, 1, 810);
-  message->SetExtension(unittest::packed_float_extension   , 1, 811);
-  message->SetExtension(unittest::packed_double_extension  , 1, 812);
-  message->SetExtension(unittest::packed_bool_extension    , 1, true);
-  message->SetExtension(unittest::packed_enum_extension    , 1,
-                        unittest::FOREIGN_FOO);
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedExtensionsSet(
-    const unittest::TestPackedExtensions& message) {
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_enum_extension    ));
-
-  EXPECT_EQ(601  , message.GetExtension(unittest::packed_int32_extension   , 0));
-  EXPECT_EQ(602  , message.GetExtension(unittest::packed_int64_extension   , 0));
-  EXPECT_EQ(603  , message.GetExtension(unittest::packed_uint32_extension  , 0));
-  EXPECT_EQ(604  , message.GetExtension(unittest::packed_uint64_extension  , 0));
-  EXPECT_EQ(605  , message.GetExtension(unittest::packed_sint32_extension  , 0));
-  EXPECT_EQ(606  , message.GetExtension(unittest::packed_sint64_extension  , 0));
-  EXPECT_EQ(607  , message.GetExtension(unittest::packed_fixed32_extension , 0));
-  EXPECT_EQ(608  , message.GetExtension(unittest::packed_fixed64_extension , 0));
-  EXPECT_EQ(609  , message.GetExtension(unittest::packed_sfixed32_extension, 0));
-  EXPECT_EQ(610  , message.GetExtension(unittest::packed_sfixed64_extension, 0));
-  EXPECT_EQ(611  , message.GetExtension(unittest::packed_float_extension   , 0));
-  EXPECT_EQ(612  , message.GetExtension(unittest::packed_double_extension  , 0));
-  EXPECT_TRUE(     message.GetExtension(unittest::packed_bool_extension    , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR,
-            message.GetExtension(unittest::packed_enum_extension, 0));
-  EXPECT_EQ(701  , message.GetExtension(unittest::packed_int32_extension   , 1));
-  EXPECT_EQ(702  , message.GetExtension(unittest::packed_int64_extension   , 1));
-  EXPECT_EQ(703  , message.GetExtension(unittest::packed_uint32_extension  , 1));
-  EXPECT_EQ(704  , message.GetExtension(unittest::packed_uint64_extension  , 1));
-  EXPECT_EQ(705  , message.GetExtension(unittest::packed_sint32_extension  , 1));
-  EXPECT_EQ(706  , message.GetExtension(unittest::packed_sint64_extension  , 1));
-  EXPECT_EQ(707  , message.GetExtension(unittest::packed_fixed32_extension , 1));
-  EXPECT_EQ(708  , message.GetExtension(unittest::packed_fixed64_extension , 1));
-  EXPECT_EQ(709  , message.GetExtension(unittest::packed_sfixed32_extension, 1));
-  EXPECT_EQ(710  , message.GetExtension(unittest::packed_sfixed64_extension, 1));
-  EXPECT_EQ(711  , message.GetExtension(unittest::packed_float_extension   , 1));
-  EXPECT_EQ(712  , message.GetExtension(unittest::packed_double_extension  , 1));
-  EXPECT_FALSE(    message.GetExtension(unittest::packed_bool_extension    , 1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ,
-            message.GetExtension(unittest::packed_enum_extension, 1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedExtensionsClear(
-    const unittest::TestPackedExtensions& message) {
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_int32_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_int64_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_uint32_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_uint64_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_sint32_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_sint64_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_fixed32_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_fixed64_extension ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_sfixed32_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_sfixed64_extension));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_float_extension   ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_double_extension  ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_bool_extension    ));
-  EXPECT_EQ(0, message.ExtensionSize(unittest::packed_enum_extension    ));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectPackedExtensionsModified(
-    const unittest::TestPackedExtensions& message) {
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::packed_enum_extension    ));
-  EXPECT_EQ(601  , message.GetExtension(unittest::packed_int32_extension   , 0));
-  EXPECT_EQ(602  , message.GetExtension(unittest::packed_int64_extension   , 0));
-  EXPECT_EQ(603  , message.GetExtension(unittest::packed_uint32_extension  , 0));
-  EXPECT_EQ(604  , message.GetExtension(unittest::packed_uint64_extension  , 0));
-  EXPECT_EQ(605  , message.GetExtension(unittest::packed_sint32_extension  , 0));
-  EXPECT_EQ(606  , message.GetExtension(unittest::packed_sint64_extension  , 0));
-  EXPECT_EQ(607  , message.GetExtension(unittest::packed_fixed32_extension , 0));
-  EXPECT_EQ(608  , message.GetExtension(unittest::packed_fixed64_extension , 0));
-  EXPECT_EQ(609  , message.GetExtension(unittest::packed_sfixed32_extension, 0));
-  EXPECT_EQ(610  , message.GetExtension(unittest::packed_sfixed64_extension, 0));
-  EXPECT_EQ(611  , message.GetExtension(unittest::packed_float_extension   , 0));
-  EXPECT_EQ(612  , message.GetExtension(unittest::packed_double_extension  , 0));
-  EXPECT_TRUE(     message.GetExtension(unittest::packed_bool_extension    , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR,
-            message.GetExtension(unittest::packed_enum_extension, 0));
-
-  // Actually verify the second (modified) elements now.
-  EXPECT_EQ(801  , message.GetExtension(unittest::packed_int32_extension   , 1));
-  EXPECT_EQ(802  , message.GetExtension(unittest::packed_int64_extension   , 1));
-  EXPECT_EQ(803  , message.GetExtension(unittest::packed_uint32_extension  , 1));
-  EXPECT_EQ(804  , message.GetExtension(unittest::packed_uint64_extension  , 1));
-  EXPECT_EQ(805  , message.GetExtension(unittest::packed_sint32_extension  , 1));
-  EXPECT_EQ(806  , message.GetExtension(unittest::packed_sint64_extension  , 1));
-  EXPECT_EQ(807  , message.GetExtension(unittest::packed_fixed32_extension , 1));
-  EXPECT_EQ(808  , message.GetExtension(unittest::packed_fixed64_extension , 1));
-  EXPECT_EQ(809  , message.GetExtension(unittest::packed_sfixed32_extension, 1));
-  EXPECT_EQ(810  , message.GetExtension(unittest::packed_sfixed64_extension, 1));
-  EXPECT_EQ(811  , message.GetExtension(unittest::packed_float_extension   , 1));
-  EXPECT_EQ(812  , message.GetExtension(unittest::packed_double_extension  , 1));
-  EXPECT_TRUE(     message.GetExtension(unittest::packed_bool_extension    , 1));
-  EXPECT_EQ(unittest::FOREIGN_FOO,
-            message.GetExtension(unittest::packed_enum_extension, 1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectUnpackedExtensionsSet(
-    const unittest::TestUnpackedExtensions& message) {
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::unpacked_enum_extension    ));
-
-  EXPECT_EQ(601  , message.GetExtension(unittest::unpacked_int32_extension   , 0));
-  EXPECT_EQ(602  , message.GetExtension(unittest::unpacked_int64_extension   , 0));
-  EXPECT_EQ(603  , message.GetExtension(unittest::unpacked_uint32_extension  , 0));
-  EXPECT_EQ(604  , message.GetExtension(unittest::unpacked_uint64_extension  , 0));
-  EXPECT_EQ(605  , message.GetExtension(unittest::unpacked_sint32_extension  , 0));
-  EXPECT_EQ(606  , message.GetExtension(unittest::unpacked_sint64_extension  , 0));
-  EXPECT_EQ(607  , message.GetExtension(unittest::unpacked_fixed32_extension , 0));
-  EXPECT_EQ(608  , message.GetExtension(unittest::unpacked_fixed64_extension , 0));
-  EXPECT_EQ(609  , message.GetExtension(unittest::unpacked_sfixed32_extension, 0));
-  EXPECT_EQ(610  , message.GetExtension(unittest::unpacked_sfixed64_extension, 0));
-  EXPECT_EQ(611  , message.GetExtension(unittest::unpacked_float_extension   , 0));
-  EXPECT_EQ(612  , message.GetExtension(unittest::unpacked_double_extension  , 0));
-  EXPECT_EQ(true , message.GetExtension(unittest::unpacked_bool_extension    , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR,
-            message.GetExtension(unittest::unpacked_enum_extension, 0));
-  EXPECT_EQ(701  , message.GetExtension(unittest::unpacked_int32_extension   , 1));
-  EXPECT_EQ(702  , message.GetExtension(unittest::unpacked_int64_extension   , 1));
-  EXPECT_EQ(703  , message.GetExtension(unittest::unpacked_uint32_extension  , 1));
-  EXPECT_EQ(704  , message.GetExtension(unittest::unpacked_uint64_extension  , 1));
-  EXPECT_EQ(705  , message.GetExtension(unittest::unpacked_sint32_extension  , 1));
-  EXPECT_EQ(706  , message.GetExtension(unittest::unpacked_sint64_extension  , 1));
-  EXPECT_EQ(707  , message.GetExtension(unittest::unpacked_fixed32_extension , 1));
-  EXPECT_EQ(708  , message.GetExtension(unittest::unpacked_fixed64_extension , 1));
-  EXPECT_EQ(709  , message.GetExtension(unittest::unpacked_sfixed32_extension, 1));
-  EXPECT_EQ(710  , message.GetExtension(unittest::unpacked_sfixed64_extension, 1));
-  EXPECT_EQ(711  , message.GetExtension(unittest::unpacked_float_extension   , 1));
-  EXPECT_EQ(712  , message.GetExtension(unittest::unpacked_double_extension  , 1));
-  EXPECT_EQ(false, message.GetExtension(unittest::unpacked_bool_extension    , 1));
-  EXPECT_EQ(unittest::FOREIGN_BAZ,
-            message.GetExtension(unittest::unpacked_enum_extension, 1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ExpectAllFieldsAndExtensionsInOrder(const string& serialized) {
-  // We set each field individually, serialize separately, and concatenate all
-  // the strings in canonical order to determine the expected serialization.
-  string expected;
-  unittest::TestFieldOrderings message;
-  message.set_my_int(1);  // Field 1.
-  message.AppendToString(&expected);
-  message.Clear();
-  message.SetExtension(unittest::my_extension_int, 23);  // Field 5.
-  message.AppendToString(&expected);
-  message.Clear();
-  message.set_my_string("foo");  // Field 11.
-  message.AppendToString(&expected);
-  message.Clear();
-  message.SetExtension(unittest::my_extension_string, "bar");  // Field 50.
-  message.AppendToString(&expected);
-  message.Clear();
-  message.set_my_float(1.0);  // Field 101.
-  message.AppendToString(&expected);
-  message.Clear();
-
-  // We don't EXPECT_EQ() since we don't want to print raw bytes to stdout.
-  EXPECT_TRUE(serialized == expected);
-}
-
-void TestUtil::ExpectLastRepeatedsRemoved(
-    const unittest::TestAllTypes& message) {
-  ASSERT_EQ(1, message.repeated_int32_size   ());
-  ASSERT_EQ(1, message.repeated_int64_size   ());
-  ASSERT_EQ(1, message.repeated_uint32_size  ());
-  ASSERT_EQ(1, message.repeated_uint64_size  ());
-  ASSERT_EQ(1, message.repeated_sint32_size  ());
-  ASSERT_EQ(1, message.repeated_sint64_size  ());
-  ASSERT_EQ(1, message.repeated_fixed32_size ());
-  ASSERT_EQ(1, message.repeated_fixed64_size ());
-  ASSERT_EQ(1, message.repeated_sfixed32_size());
-  ASSERT_EQ(1, message.repeated_sfixed64_size());
-  ASSERT_EQ(1, message.repeated_float_size   ());
-  ASSERT_EQ(1, message.repeated_double_size  ());
-  ASSERT_EQ(1, message.repeated_bool_size    ());
-  ASSERT_EQ(1, message.repeated_string_size  ());
-  ASSERT_EQ(1, message.repeated_bytes_size   ());
-
-  ASSERT_EQ(1, message.repeatedgroup_size           ());
-  ASSERT_EQ(1, message.repeated_nested_message_size ());
-  ASSERT_EQ(1, message.repeated_foreign_message_size());
-  ASSERT_EQ(1, message.repeated_import_message_size ());
-  ASSERT_EQ(1, message.repeated_import_message_size ());
-  ASSERT_EQ(1, message.repeated_nested_enum_size    ());
-  ASSERT_EQ(1, message.repeated_foreign_enum_size   ());
-  ASSERT_EQ(1, message.repeated_import_enum_size    ());
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  ASSERT_EQ(1, message.repeated_string_piece_size());
-  ASSERT_EQ(1, message.repeated_cord_size());
-#endif
-
-  // Test that the remaining element is the correct one.
-  EXPECT_EQ(201  , message.repeated_int32   (0));
-  EXPECT_EQ(202  , message.repeated_int64   (0));
-  EXPECT_EQ(203  , message.repeated_uint32  (0));
-  EXPECT_EQ(204  , message.repeated_uint64  (0));
-  EXPECT_EQ(205  , message.repeated_sint32  (0));
-  EXPECT_EQ(206  , message.repeated_sint64  (0));
-  EXPECT_EQ(207  , message.repeated_fixed32 (0));
-  EXPECT_EQ(208  , message.repeated_fixed64 (0));
-  EXPECT_EQ(209  , message.repeated_sfixed32(0));
-  EXPECT_EQ(210  , message.repeated_sfixed64(0));
-  EXPECT_EQ(211  , message.repeated_float   (0));
-  EXPECT_EQ(212  , message.repeated_double  (0));
-  EXPECT_TRUE(     message.repeated_bool    (0));
-  EXPECT_EQ("215", message.repeated_string  (0));
-  EXPECT_EQ("216", message.repeated_bytes   (0));
-
-  EXPECT_EQ(217, message.repeatedgroup           (0).a());
-  EXPECT_EQ(218, message.repeated_nested_message (0).bb());
-  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.repeated_import_enum (0));
-}
-
-void TestUtil::ExpectLastRepeatedExtensionsRemoved(
-    const unittest::TestAllExtensions& message) {
-
-  // Test that one element was removed.
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_int32_extension   ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_int64_extension   ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_uint32_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_uint64_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_sint32_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_sint64_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_fixed32_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_fixed64_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_sfixed32_extension));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_sfixed64_extension));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_float_extension   ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_double_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_bool_extension    ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_string_extension  ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_bytes_extension   ));
-
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
-
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_string_piece_extension));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_cord_extension));
-
-  // Test that the remaining element is the correct one.
-  EXPECT_EQ(201  , message.GetExtension(unittest::repeated_int32_extension   , 0));
-  EXPECT_EQ(202  , message.GetExtension(unittest::repeated_int64_extension   , 0));
-  EXPECT_EQ(203  , message.GetExtension(unittest::repeated_uint32_extension  , 0));
-  EXPECT_EQ(204  , message.GetExtension(unittest::repeated_uint64_extension  , 0));
-  EXPECT_EQ(205  , message.GetExtension(unittest::repeated_sint32_extension  , 0));
-  EXPECT_EQ(206  , message.GetExtension(unittest::repeated_sint64_extension  , 0));
-  EXPECT_EQ(207  , message.GetExtension(unittest::repeated_fixed32_extension , 0));
-  EXPECT_EQ(208  , message.GetExtension(unittest::repeated_fixed64_extension , 0));
-  EXPECT_EQ(209  , message.GetExtension(unittest::repeated_sfixed32_extension, 0));
-  EXPECT_EQ(210  , message.GetExtension(unittest::repeated_sfixed64_extension, 0));
-  EXPECT_EQ(211  , message.GetExtension(unittest::repeated_float_extension   , 0));
-  EXPECT_EQ(212  , message.GetExtension(unittest::repeated_double_extension  , 0));
-  EXPECT_TRUE(     message.GetExtension(unittest::repeated_bool_extension    , 0));
-  EXPECT_EQ("215", message.GetExtension(unittest::repeated_string_extension  , 0));
-  EXPECT_EQ("216", message.GetExtension(unittest::repeated_bytes_extension   , 0));
-
-  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
-  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
-  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
-  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
-  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.GetExtension(unittest::repeated_import_enum_extension , 0));
-
-  EXPECT_EQ("224", message.GetExtension(unittest::repeated_string_piece_extension, 0));
-  EXPECT_EQ("225", message.GetExtension(unittest::repeated_cord_extension, 0));
-}
-
-void TestUtil::ExpectLastRepeatedsReleased(
-    const unittest::TestAllTypes& message) {
-  ASSERT_EQ(1, message.repeatedgroup_size           ());
-  ASSERT_EQ(1, message.repeated_nested_message_size ());
-  ASSERT_EQ(1, message.repeated_foreign_message_size());
-  ASSERT_EQ(1, message.repeated_import_message_size ());
-  ASSERT_EQ(1, message.repeated_import_message_size ());
-
-  EXPECT_EQ(217, message.repeatedgroup           (0).a());
-  EXPECT_EQ(218, message.repeated_nested_message (0).bb());
-  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-  EXPECT_EQ(220, message.repeated_import_message (0).d());
-}
-
-void TestUtil::ExpectLastRepeatedExtensionsReleased(
-    const unittest::TestAllExtensions& message) {
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-
-  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
-  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
-  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
-  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
-  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
-}
-
-void TestUtil::ExpectRepeatedsSwapped(
-    const unittest::TestAllTypes& message) {
-  ASSERT_EQ(2, message.repeated_int32_size   ());
-  ASSERT_EQ(2, message.repeated_int64_size   ());
-  ASSERT_EQ(2, message.repeated_uint32_size  ());
-  ASSERT_EQ(2, message.repeated_uint64_size  ());
-  ASSERT_EQ(2, message.repeated_sint32_size  ());
-  ASSERT_EQ(2, message.repeated_sint64_size  ());
-  ASSERT_EQ(2, message.repeated_fixed32_size ());
-  ASSERT_EQ(2, message.repeated_fixed64_size ());
-  ASSERT_EQ(2, message.repeated_sfixed32_size());
-  ASSERT_EQ(2, message.repeated_sfixed64_size());
-  ASSERT_EQ(2, message.repeated_float_size   ());
-  ASSERT_EQ(2, message.repeated_double_size  ());
-  ASSERT_EQ(2, message.repeated_bool_size    ());
-  ASSERT_EQ(2, message.repeated_string_size  ());
-  ASSERT_EQ(2, message.repeated_bytes_size   ());
-
-  ASSERT_EQ(2, message.repeatedgroup_size           ());
-  ASSERT_EQ(2, message.repeated_nested_message_size ());
-  ASSERT_EQ(2, message.repeated_foreign_message_size());
-  ASSERT_EQ(2, message.repeated_import_message_size ());
-  ASSERT_EQ(2, message.repeated_import_message_size ());
-  ASSERT_EQ(2, message.repeated_nested_enum_size    ());
-  ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
-  ASSERT_EQ(2, message.repeated_import_enum_size    ());
-
-#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
-  ASSERT_EQ(2, message.repeated_string_piece_size());
-  ASSERT_EQ(2, message.repeated_cord_size());
-#endif
-
-  // Test that the first element and second element are flipped.
-  EXPECT_EQ(201  , message.repeated_int32   (1));
-  EXPECT_EQ(202  , message.repeated_int64   (1));
-  EXPECT_EQ(203  , message.repeated_uint32  (1));
-  EXPECT_EQ(204  , message.repeated_uint64  (1));
-  EXPECT_EQ(205  , message.repeated_sint32  (1));
-  EXPECT_EQ(206  , message.repeated_sint64  (1));
-  EXPECT_EQ(207  , message.repeated_fixed32 (1));
-  EXPECT_EQ(208  , message.repeated_fixed64 (1));
-  EXPECT_EQ(209  , message.repeated_sfixed32(1));
-  EXPECT_EQ(210  , message.repeated_sfixed64(1));
-  EXPECT_EQ(211  , message.repeated_float   (1));
-  EXPECT_EQ(212  , message.repeated_double  (1));
-  EXPECT_TRUE(     message.repeated_bool    (1));
-  EXPECT_EQ("215", message.repeated_string  (1));
-  EXPECT_EQ("216", message.repeated_bytes   (1));
-
-  EXPECT_EQ(217, message.repeatedgroup           (1).a());
-  EXPECT_EQ(218, message.repeated_nested_message (1).bb());
-  EXPECT_EQ(219, message.repeated_foreign_message(1).c());
-  EXPECT_EQ(220, message.repeated_import_message (1).d());
-  EXPECT_EQ(220, message.repeated_import_message (1).d());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (1));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(1));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.repeated_import_enum (1));
-
-  EXPECT_EQ(301  , message.repeated_int32   (0));
-  EXPECT_EQ(302  , message.repeated_int64   (0));
-  EXPECT_EQ(303  , message.repeated_uint32  (0));
-  EXPECT_EQ(304  , message.repeated_uint64  (0));
-  EXPECT_EQ(305  , message.repeated_sint32  (0));
-  EXPECT_EQ(306  , message.repeated_sint64  (0));
-  EXPECT_EQ(307  , message.repeated_fixed32 (0));
-  EXPECT_EQ(308  , message.repeated_fixed64 (0));
-  EXPECT_EQ(309  , message.repeated_sfixed32(0));
-  EXPECT_EQ(310  , message.repeated_sfixed64(0));
-  EXPECT_EQ(311  , message.repeated_float   (0));
-  EXPECT_EQ(312  , message.repeated_double  (0));
-  EXPECT_FALSE(    message.repeated_bool    (0));
-  EXPECT_EQ("315", message.repeated_string  (0));
-  EXPECT_EQ("316", message.repeated_bytes   (0));
-
-  EXPECT_EQ(317, message.repeatedgroup           (0).a());
-  EXPECT_EQ(318, message.repeated_nested_message (0).bb());
-  EXPECT_EQ(319, message.repeated_foreign_message(0).c());
-  EXPECT_EQ(320, message.repeated_import_message (0).d());
-  EXPECT_EQ(320, message.repeated_import_message (0).d());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.repeated_nested_enum (0));
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.repeated_foreign_enum(0));
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.repeated_import_enum (0));
-}
-
-void TestUtil::ExpectRepeatedExtensionsSwapped(
-    const unittest::TestAllExtensions& message) {
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int32_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_int64_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_uint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint32_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sint64_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed32_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_fixed64_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed32_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_sfixed64_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_float_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_double_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bool_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_extension  ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_bytes_extension   ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeatedgroup_extension           ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
-
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_string_piece_extension));
-  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_cord_extension));
-
-  EXPECT_EQ(201  , message.GetExtension(unittest::repeated_int32_extension   , 1));
-  EXPECT_EQ(202  , message.GetExtension(unittest::repeated_int64_extension   , 1));
-  EXPECT_EQ(203  , message.GetExtension(unittest::repeated_uint32_extension  , 1));
-  EXPECT_EQ(204  , message.GetExtension(unittest::repeated_uint64_extension  , 1));
-  EXPECT_EQ(205  , message.GetExtension(unittest::repeated_sint32_extension  , 1));
-  EXPECT_EQ(206  , message.GetExtension(unittest::repeated_sint64_extension  , 1));
-  EXPECT_EQ(207  , message.GetExtension(unittest::repeated_fixed32_extension , 1));
-  EXPECT_EQ(208  , message.GetExtension(unittest::repeated_fixed64_extension , 1));
-  EXPECT_EQ(209  , message.GetExtension(unittest::repeated_sfixed32_extension, 1));
-  EXPECT_EQ(210  , message.GetExtension(unittest::repeated_sfixed64_extension, 1));
-  EXPECT_EQ(211  , message.GetExtension(unittest::repeated_float_extension   , 1));
-  EXPECT_EQ(212  , message.GetExtension(unittest::repeated_double_extension  , 1));
-  EXPECT_TRUE(     message.GetExtension(unittest::repeated_bool_extension    , 1));
-  EXPECT_EQ("215", message.GetExtension(unittest::repeated_string_extension  , 1));
-  EXPECT_EQ("216", message.GetExtension(unittest::repeated_bytes_extension   , 1));
-
-  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 1).a());
-  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
-  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
-  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
-  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
-  EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
-  EXPECT_EQ(unittest_import::IMPORT_BAR, message.GetExtension(unittest::repeated_import_enum_extension , 1));
-
-  EXPECT_EQ("224", message.GetExtension(unittest::repeated_string_piece_extension, 1));
-  EXPECT_EQ("225", message.GetExtension(unittest::repeated_cord_extension, 1));
-
-  EXPECT_EQ(301  , message.GetExtension(unittest::repeated_int32_extension   , 0));
-  EXPECT_EQ(302  , message.GetExtension(unittest::repeated_int64_extension   , 0));
-  EXPECT_EQ(303  , message.GetExtension(unittest::repeated_uint32_extension  , 0));
-  EXPECT_EQ(304  , message.GetExtension(unittest::repeated_uint64_extension  , 0));
-  EXPECT_EQ(305  , message.GetExtension(unittest::repeated_sint32_extension  , 0));
-  EXPECT_EQ(306  , message.GetExtension(unittest::repeated_sint64_extension  , 0));
-  EXPECT_EQ(307  , message.GetExtension(unittest::repeated_fixed32_extension , 0));
-  EXPECT_EQ(308  , message.GetExtension(unittest::repeated_fixed64_extension , 0));
-  EXPECT_EQ(309  , message.GetExtension(unittest::repeated_sfixed32_extension, 0));
-  EXPECT_EQ(310  , message.GetExtension(unittest::repeated_sfixed64_extension, 0));
-  EXPECT_EQ(311  , message.GetExtension(unittest::repeated_float_extension   , 0));
-  EXPECT_EQ(312  , message.GetExtension(unittest::repeated_double_extension  , 0));
-  EXPECT_FALSE(    message.GetExtension(unittest::repeated_bool_extension    , 0));
-  EXPECT_EQ("315", message.GetExtension(unittest::repeated_string_extension  , 0));
-  EXPECT_EQ("316", message.GetExtension(unittest::repeated_bytes_extension   , 0));
-
-  EXPECT_EQ(317, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
-  EXPECT_EQ(318, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
-  EXPECT_EQ(319, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
-  EXPECT_EQ(320, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
-  EXPECT_EQ(327, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
-
-  EXPECT_EQ(unittest::TestAllTypes::BAZ, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
-  EXPECT_EQ(unittest::FOREIGN_BAZ      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
-  EXPECT_EQ(unittest_import::IMPORT_BAZ, message.GetExtension(unittest::repeated_import_enum_extension , 0));
-
-  EXPECT_EQ("324", message.GetExtension(unittest::repeated_string_piece_extension, 0));
-  EXPECT_EQ("325", message.GetExtension(unittest::repeated_cord_extension, 0));
-}
-
-void TestUtil::SetOneof1(unittest::TestOneof2* message) {
-  message->mutable_foo_lazy_message()->set_qux_int(100);
-  message->set_bar_string("101");
-  message->set_baz_int(102);
-  message->set_baz_string("103");
-}
-
-void TestUtil::SetOneof2(unittest::TestOneof2* message) {
-  message->set_foo_int(200);
-  message->set_bar_enum(unittest::TestOneof2::BAZ);
-  message->set_baz_int(202);
-  message->set_baz_string("203");
-}
-
-void TestUtil::ExpectOneofSet1(const unittest::TestOneof2& message) {
-  ExpectAtMostOneFieldSetInOneof(message);
-
-  EXPECT_TRUE(message.has_foo_lazy_message          ());
-  EXPECT_TRUE(message.foo_lazy_message().has_qux_int());
-
-  EXPECT_TRUE(message.has_bar_string());
-  EXPECT_TRUE(message.has_baz_int   ());
-  EXPECT_TRUE(message.has_baz_string());
-
-  ASSERT_EQ(0, message.foo_lazy_message().corge_int_size());
-
-  EXPECT_EQ(100  , message.foo_lazy_message().qux_int());
-  EXPECT_EQ("101", message.bar_string                ());
-  EXPECT_EQ(102  , message.baz_int                   ());
-  EXPECT_EQ("103", message.baz_string                ());
-}
-
-void TestUtil::ExpectOneofSet2(const unittest::TestOneof2& message) {
-  ExpectAtMostOneFieldSetInOneof(message);
-
-  EXPECT_TRUE(message.has_foo_int   ());
-  EXPECT_TRUE(message.has_bar_enum  ());
-  EXPECT_TRUE(message.has_baz_int   ());
-  EXPECT_TRUE(message.has_baz_string());
-
-  EXPECT_EQ(200                      , message.foo_int   ());
-  EXPECT_EQ(unittest::TestOneof2::BAZ, message.bar_enum  ());
-  EXPECT_EQ(202                      , message.baz_int   ());
-  EXPECT_EQ("203"                    , message.baz_string());
-}
-
-void TestUtil::ExpectOneofClear(const unittest::TestOneof2& message) {
-  EXPECT_FALSE(message.has_foo_int());
-  EXPECT_FALSE(message.has_foo_string());
-  EXPECT_FALSE(message.has_foo_bytes());
-  EXPECT_FALSE(message.has_foo_enum());
-  EXPECT_FALSE(message.has_foo_message());
-  EXPECT_FALSE(message.has_foogroup());
-  EXPECT_FALSE(message.has_foo_lazy_message());
-
-  EXPECT_FALSE(message.has_bar_int());
-  EXPECT_FALSE(message.has_bar_string());
-  EXPECT_FALSE(message.has_bar_bytes());
-  EXPECT_FALSE(message.has_bar_enum());
-
-  EXPECT_FALSE(message.has_baz_int());
-  EXPECT_FALSE(message.has_baz_string());
-
-  EXPECT_EQ(unittest::TestOneof2::FOO_NOT_SET, message.foo_case());
-  EXPECT_EQ(unittest::TestOneof2::BAR_NOT_SET, message.bar_case());
-}
-
-void TestUtil::ExpectAtMostOneFieldSetInOneof(
-    const unittest::TestOneof2& message) {
-  int count = 0;
-  if (message.has_foo_int()) count++;
-  if (message.has_foo_string()) count++;
-  if (message.has_foo_bytes()) count++;
-  if (message.has_foo_enum()) count++;
-  if (message.has_foo_message()) count++;
-  if (message.has_foogroup()) count++;
-  if (message.has_foo_lazy_message()) count++;
-  EXPECT_LE(count, 1);
-  count = 0;
-  if (message.has_bar_int()) count++;
-  if (message.has_bar_string()) count++;
-  if (message.has_bar_bytes()) count++;
-  if (message.has_bar_enum()) count++;
-  EXPECT_TRUE(count == 0 || count == 1);
-}
-
-// ===================================================================
-
-TestUtil::ReflectionTester::ReflectionTester(
-    const Descriptor* base_descriptor)
-  : base_descriptor_(base_descriptor) {
-
-  const DescriptorPool* pool = base_descriptor->file()->pool();
-
-  nested_b_ =
-    pool->FindFieldByName("protobuf_unittest.TestAllTypes.NestedMessage.bb");
-  foreign_c_ =
-    pool->FindFieldByName("protobuf_unittest.ForeignMessage.c");
-  import_d_ =
-    pool->FindFieldByName("protobuf_unittest_import.ImportMessage.d");
-  import_e_ =
-    pool->FindFieldByName("protobuf_unittest_import.PublicImportMessage.e");
-  nested_foo_ =
-    pool->FindEnumValueByName("protobuf_unittest.TestAllTypes.FOO");
-  nested_bar_ =
-    pool->FindEnumValueByName("protobuf_unittest.TestAllTypes.BAR");
-  nested_baz_ =
-    pool->FindEnumValueByName("protobuf_unittest.TestAllTypes.BAZ");
-  foreign_foo_ =
-    pool->FindEnumValueByName("protobuf_unittest.FOREIGN_FOO");
-  foreign_bar_ =
-    pool->FindEnumValueByName("protobuf_unittest.FOREIGN_BAR");
-  foreign_baz_ =
-    pool->FindEnumValueByName("protobuf_unittest.FOREIGN_BAZ");
-  import_foo_ =
-    pool->FindEnumValueByName("protobuf_unittest_import.IMPORT_FOO");
-  import_bar_ =
-    pool->FindEnumValueByName("protobuf_unittest_import.IMPORT_BAR");
-  import_baz_ =
-    pool->FindEnumValueByName("protobuf_unittest_import.IMPORT_BAZ");
-
-  if (base_descriptor_->name() == "TestAllExtensions") {
-    group_a_ =
-      pool->FindFieldByName("protobuf_unittest.OptionalGroup_extension.a");
-    repeated_group_a_ =
-      pool->FindFieldByName("protobuf_unittest.RepeatedGroup_extension.a");
-  } else {
-    group_a_ =
-      pool->FindFieldByName("protobuf_unittest.TestAllTypes.OptionalGroup.a");
-    repeated_group_a_ =
-      pool->FindFieldByName("protobuf_unittest.TestAllTypes.RepeatedGroup.a");
-  }
-
-  EXPECT_TRUE(group_a_          != NULL);
-  EXPECT_TRUE(repeated_group_a_ != NULL);
-  EXPECT_TRUE(nested_b_         != NULL);
-  EXPECT_TRUE(foreign_c_        != NULL);
-  EXPECT_TRUE(import_d_         != NULL);
-  EXPECT_TRUE(import_e_         != NULL);
-  EXPECT_TRUE(nested_foo_       != NULL);
-  EXPECT_TRUE(nested_bar_       != NULL);
-  EXPECT_TRUE(nested_baz_       != NULL);
-  EXPECT_TRUE(foreign_foo_      != NULL);
-  EXPECT_TRUE(foreign_bar_      != NULL);
-  EXPECT_TRUE(foreign_baz_      != NULL);
-  EXPECT_TRUE(import_foo_       != NULL);
-  EXPECT_TRUE(import_bar_       != NULL);
-  EXPECT_TRUE(import_baz_       != NULL);
-}
-
-// Shorthand to get a FieldDescriptor for a field of unittest::TestAllTypes.
-const FieldDescriptor* TestUtil::ReflectionTester::F(const string& name) {
-  const FieldDescriptor* result = NULL;
-  if (base_descriptor_->name() == "TestAllExtensions" ||
-      base_descriptor_->name() == "TestPackedExtensions") {
-    result = base_descriptor_->file()->FindExtensionByName(name + "_extension");
-  } else {
-    result = base_descriptor_->FindFieldByName(name);
-  }
-  GOOGLE_CHECK(result != NULL);
-  return result;
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ReflectionTester::SetAllFieldsViaReflection(Message* message) {
-  const Reflection* reflection = message->GetReflection();
-  Message* sub_message;
-
-  reflection->SetInt32 (message, F("optional_int32"   ), 101);
-  reflection->SetInt64 (message, F("optional_int64"   ), 102);
-  reflection->SetUInt32(message, F("optional_uint32"  ), 103);
-  reflection->SetUInt64(message, F("optional_uint64"  ), 104);
-  reflection->SetInt32 (message, F("optional_sint32"  ), 105);
-  reflection->SetInt64 (message, F("optional_sint64"  ), 106);
-  reflection->SetUInt32(message, F("optional_fixed32" ), 107);
-  reflection->SetUInt64(message, F("optional_fixed64" ), 108);
-  reflection->SetInt32 (message, F("optional_sfixed32"), 109);
-  reflection->SetInt64 (message, F("optional_sfixed64"), 110);
-  reflection->SetFloat (message, F("optional_float"   ), 111);
-  reflection->SetDouble(message, F("optional_double"  ), 112);
-  reflection->SetBool  (message, F("optional_bool"    ), true);
-  reflection->SetString(message, F("optional_string"  ), "115");
-  reflection->SetString(message, F("optional_bytes"   ), "116");
-
-  sub_message = reflection->MutableMessage(message, F("optionalgroup"));
-  sub_message->GetReflection()->SetInt32(sub_message, group_a_, 117);
-  sub_message = reflection->MutableMessage(message, F("optional_nested_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 118);
-  sub_message = reflection->MutableMessage(message, F("optional_foreign_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 119);
-  sub_message = reflection->MutableMessage(message, F("optional_import_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 120);
-
-  reflection->SetEnum(message, F("optional_nested_enum" ),  nested_baz_);
-  reflection->SetEnum(message, F("optional_foreign_enum"), foreign_baz_);
-  reflection->SetEnum(message, F("optional_import_enum" ),  import_baz_);
-
-  reflection->SetString(message, F("optional_string_piece"), "124");
-  reflection->SetString(message, F("optional_cord"), "125");
-
-  sub_message = reflection->MutableMessage(message, F("optional_public_import_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, import_e_, 126);
-
-  sub_message = reflection->MutableMessage(message, F("optional_lazy_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 127);
-
-  // -----------------------------------------------------------------
-
-  reflection->AddInt32 (message, F("repeated_int32"   ), 201);
-  reflection->AddInt64 (message, F("repeated_int64"   ), 202);
-  reflection->AddUInt32(message, F("repeated_uint32"  ), 203);
-  reflection->AddUInt64(message, F("repeated_uint64"  ), 204);
-  reflection->AddInt32 (message, F("repeated_sint32"  ), 205);
-  reflection->AddInt64 (message, F("repeated_sint64"  ), 206);
-  reflection->AddUInt32(message, F("repeated_fixed32" ), 207);
-  reflection->AddUInt64(message, F("repeated_fixed64" ), 208);
-  reflection->AddInt32 (message, F("repeated_sfixed32"), 209);
-  reflection->AddInt64 (message, F("repeated_sfixed64"), 210);
-  reflection->AddFloat (message, F("repeated_float"   ), 211);
-  reflection->AddDouble(message, F("repeated_double"  ), 212);
-  reflection->AddBool  (message, F("repeated_bool"    ), true);
-  reflection->AddString(message, F("repeated_string"  ), "215");
-  reflection->AddString(message, F("repeated_bytes"   ), "216");
-
-  sub_message = reflection->AddMessage(message, F("repeatedgroup"));
-  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 217);
-  sub_message = reflection->AddMessage(message, F("repeated_nested_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 218);
-  sub_message = reflection->AddMessage(message, F("repeated_foreign_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 219);
-  sub_message = reflection->AddMessage(message, F("repeated_import_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 220);
-  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 227);
-
-  reflection->AddEnum(message, F("repeated_nested_enum" ),  nested_bar_);
-  reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_bar_);
-  reflection->AddEnum(message, F("repeated_import_enum" ),  import_bar_);
-
-  reflection->AddString(message, F("repeated_string_piece"), "224");
-  reflection->AddString(message, F("repeated_cord"), "225");
-
-  // Add a second one of each field.
-  reflection->AddInt32 (message, F("repeated_int32"   ), 301);
-  reflection->AddInt64 (message, F("repeated_int64"   ), 302);
-  reflection->AddUInt32(message, F("repeated_uint32"  ), 303);
-  reflection->AddUInt64(message, F("repeated_uint64"  ), 304);
-  reflection->AddInt32 (message, F("repeated_sint32"  ), 305);
-  reflection->AddInt64 (message, F("repeated_sint64"  ), 306);
-  reflection->AddUInt32(message, F("repeated_fixed32" ), 307);
-  reflection->AddUInt64(message, F("repeated_fixed64" ), 308);
-  reflection->AddInt32 (message, F("repeated_sfixed32"), 309);
-  reflection->AddInt64 (message, F("repeated_sfixed64"), 310);
-  reflection->AddFloat (message, F("repeated_float"   ), 311);
-  reflection->AddDouble(message, F("repeated_double"  ), 312);
-  reflection->AddBool  (message, F("repeated_bool"    ), false);
-  reflection->AddString(message, F("repeated_string"  ), "315");
-  reflection->AddString(message, F("repeated_bytes"   ), "316");
-
-  sub_message = reflection->AddMessage(message, F("repeatedgroup"));
-  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 317);
-  sub_message = reflection->AddMessage(message, F("repeated_nested_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 318);
-  sub_message = reflection->AddMessage(message, F("repeated_foreign_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 319);
-  sub_message = reflection->AddMessage(message, F("repeated_import_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 320);
-  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 327);
-
-  reflection->AddEnum(message, F("repeated_nested_enum" ),  nested_baz_);
-  reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_baz_);
-  reflection->AddEnum(message, F("repeated_import_enum" ),  import_baz_);
-
-  reflection->AddString(message, F("repeated_string_piece"), "324");
-  reflection->AddString(message, F("repeated_cord"), "325");
-
-  // -----------------------------------------------------------------
-
-  reflection->SetInt32 (message, F("default_int32"   ), 401);
-  reflection->SetInt64 (message, F("default_int64"   ), 402);
-  reflection->SetUInt32(message, F("default_uint32"  ), 403);
-  reflection->SetUInt64(message, F("default_uint64"  ), 404);
-  reflection->SetInt32 (message, F("default_sint32"  ), 405);
-  reflection->SetInt64 (message, F("default_sint64"  ), 406);
-  reflection->SetUInt32(message, F("default_fixed32" ), 407);
-  reflection->SetUInt64(message, F("default_fixed64" ), 408);
-  reflection->SetInt32 (message, F("default_sfixed32"), 409);
-  reflection->SetInt64 (message, F("default_sfixed64"), 410);
-  reflection->SetFloat (message, F("default_float"   ), 411);
-  reflection->SetDouble(message, F("default_double"  ), 412);
-  reflection->SetBool  (message, F("default_bool"    ), false);
-  reflection->SetString(message, F("default_string"  ), "415");
-  reflection->SetString(message, F("default_bytes"   ), "416");
-
-  reflection->SetEnum(message, F("default_nested_enum" ),  nested_foo_);
-  reflection->SetEnum(message, F("default_foreign_enum"), foreign_foo_);
-  reflection->SetEnum(message, F("default_import_enum" ),  import_foo_);
-
-  reflection->SetString(message, F("default_string_piece"), "424");
-  reflection->SetString(message, F("default_cord"), "425");
-
-  reflection->SetUInt32(message, F("oneof_uint32"   ), 601);
-  sub_message = reflection->MutableMessage(message, F("oneof_nested_message"));
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 602);
-  reflection->SetString(message, F("oneof_string"), "603");
-  reflection->SetString(message, F("oneof_bytes" ), "604");
-}
-
-void TestUtil::ReflectionTester::SetOneofViaReflection(Message* message) {
-  const Descriptor* descriptor = message->GetDescriptor();
-  const Reflection* reflection = message->GetReflection();
-  Message* sub_message = reflection->MutableMessage(
-      message, descriptor->FindFieldByName("foo_lazy_message"));
-  sub_message->GetReflection()->SetInt64(
-      sub_message,
-      descriptor->file()->pool()->FindFieldByName(
-          "protobuf_unittest.TestOneof2.NestedMessage.qux_int"),
-      100);
-
-  reflection->SetString(message,
-                        descriptor->FindFieldByName("bar_cord"),
-                        "101");
-  reflection->SetInt32(message,
-                        descriptor->FindFieldByName("baz_int"),
-                       102);
-  reflection->SetString(message,
-                        descriptor->FindFieldByName("baz_string"),
-                        "103");
-}
-
-void TestUtil::ReflectionTester::ExpectOneofSetViaReflection(
-    const Message& message) {
-  const Descriptor* descriptor = message.GetDescriptor();
-  const Reflection* reflection = message.GetReflection();
-  string scratch;
-  EXPECT_TRUE(reflection->HasField(
-      message, descriptor->FindFieldByName("foo_lazy_message")));
-  EXPECT_TRUE(reflection->HasField(
-      message, descriptor->FindFieldByName("bar_cord")));
-  EXPECT_TRUE(reflection->HasField(
-      message, descriptor->FindFieldByName("baz_int")));
-  EXPECT_TRUE(reflection->HasField(
-      message, descriptor->FindFieldByName("baz_string")));
-
-  const Message* sub_message = &reflection->GetMessage(
-      message, descriptor->FindFieldByName("foo_lazy_message"));
-  EXPECT_EQ(100, sub_message->GetReflection()->GetInt64(
-      *sub_message,
-      descriptor->file()->pool()->FindFieldByName(
-          "protobuf_unittest.TestOneof2.NestedMessage.qux_int")));
-
-  EXPECT_EQ("101", reflection->GetString(
-      message, descriptor->FindFieldByName("bar_cord")));
-  EXPECT_EQ("101", reflection->GetStringReference(
-      message, descriptor->FindFieldByName("bar_cord"), &scratch));
-
-  EXPECT_EQ(102, reflection->GetInt32(
-      message, descriptor->FindFieldByName("baz_int")));
-
-  EXPECT_EQ("103", reflection->GetString(
-      message, descriptor->FindFieldByName("baz_string")));
-  EXPECT_EQ("103", reflection->GetStringReference(
-      message, descriptor->FindFieldByName("baz_string"), &scratch));
-}
-
-void TestUtil::ReflectionTester::SetPackedFieldsViaReflection(
-    Message* message) {
-  const Reflection* reflection = message->GetReflection();
-  reflection->AddInt32 (message, F("packed_int32"   ), 601);
-  reflection->AddInt64 (message, F("packed_int64"   ), 602);
-  reflection->AddUInt32(message, F("packed_uint32"  ), 603);
-  reflection->AddUInt64(message, F("packed_uint64"  ), 604);
-  reflection->AddInt32 (message, F("packed_sint32"  ), 605);
-  reflection->AddInt64 (message, F("packed_sint64"  ), 606);
-  reflection->AddUInt32(message, F("packed_fixed32" ), 607);
-  reflection->AddUInt64(message, F("packed_fixed64" ), 608);
-  reflection->AddInt32 (message, F("packed_sfixed32"), 609);
-  reflection->AddInt64 (message, F("packed_sfixed64"), 610);
-  reflection->AddFloat (message, F("packed_float"   ), 611);
-  reflection->AddDouble(message, F("packed_double"  ), 612);
-  reflection->AddBool  (message, F("packed_bool"    ), true);
-  reflection->AddEnum  (message, F("packed_enum"    ), foreign_bar_);
-
-  reflection->AddInt32 (message, F("packed_int32"   ), 701);
-  reflection->AddInt64 (message, F("packed_int64"   ), 702);
-  reflection->AddUInt32(message, F("packed_uint32"  ), 703);
-  reflection->AddUInt64(message, F("packed_uint64"  ), 704);
-  reflection->AddInt32 (message, F("packed_sint32"  ), 705);
-  reflection->AddInt64 (message, F("packed_sint64"  ), 706);
-  reflection->AddUInt32(message, F("packed_fixed32" ), 707);
-  reflection->AddUInt64(message, F("packed_fixed64" ), 708);
-  reflection->AddInt32 (message, F("packed_sfixed32"), 709);
-  reflection->AddInt64 (message, F("packed_sfixed64"), 710);
-  reflection->AddFloat (message, F("packed_float"   ), 711);
-  reflection->AddDouble(message, F("packed_double"  ), 712);
-  reflection->AddBool  (message, F("packed_bool"    ), false);
-  reflection->AddEnum  (message, F("packed_enum"    ), foreign_baz_);
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection(
-    const Message& message) {
-  // We have to split this into three function otherwise it creates a stack
-  // frame so large that it triggers a warning.
-  ExpectAllFieldsSetViaReflection1(message);
-  ExpectAllFieldsSetViaReflection2(message);
-  ExpectAllFieldsSetViaReflection3(message);
-}
-
-void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-  string scratch;
-  const Message* sub_message;
-
-  EXPECT_TRUE(reflection->HasField(message, F("optional_int32"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_int64"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_uint32"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_uint64"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_sint32"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_sint64"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_fixed32" )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_fixed64" )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_sfixed32")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_sfixed64")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_float"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_double"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_bool"    )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_string"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_bytes"   )));
-
-  EXPECT_TRUE(reflection->HasField(message, F("optionalgroup"                 )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_message"       )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_message"      )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_import_message"       )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_public_import_message")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_lazy_message"         )));
-
-  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, group_a_));
-  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
-  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, foreign_c_));
-  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
-  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
-  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
-  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
-
-  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_enum" )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_enum")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_import_enum" )));
-
-  EXPECT_TRUE(reflection->HasField(message, F("optional_string_piece")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_cord")));
-
-  EXPECT_EQ(101  , reflection->GetInt32 (message, F("optional_int32"   )));
-  EXPECT_EQ(102  , reflection->GetInt64 (message, F("optional_int64"   )));
-  EXPECT_EQ(103  , reflection->GetUInt32(message, F("optional_uint32"  )));
-  EXPECT_EQ(104  , reflection->GetUInt64(message, F("optional_uint64"  )));
-  EXPECT_EQ(105  , reflection->GetInt32 (message, F("optional_sint32"  )));
-  EXPECT_EQ(106  , reflection->GetInt64 (message, F("optional_sint64"  )));
-  EXPECT_EQ(107  , reflection->GetUInt32(message, F("optional_fixed32" )));
-  EXPECT_EQ(108  , reflection->GetUInt64(message, F("optional_fixed64" )));
-  EXPECT_EQ(109  , reflection->GetInt32 (message, F("optional_sfixed32")));
-  EXPECT_EQ(110  , reflection->GetInt64 (message, F("optional_sfixed64")));
-  EXPECT_EQ(111  , reflection->GetFloat (message, F("optional_float"   )));
-  EXPECT_EQ(112  , reflection->GetDouble(message, F("optional_double"  )));
-  EXPECT_TRUE(     reflection->GetBool  (message, F("optional_bool"    )));
-  EXPECT_EQ("115", reflection->GetString(message, F("optional_string"  )));
-  EXPECT_EQ("116", reflection->GetString(message, F("optional_bytes"   )));
-
-  EXPECT_EQ("115", reflection->GetStringReference(message, F("optional_string"), &scratch));
-  EXPECT_EQ("116", reflection->GetStringReference(message, F("optional_bytes" ), &scratch));
-
-  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
-  EXPECT_EQ(117, sub_message->GetReflection()->GetInt32(*sub_message, group_a_));
-  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
-  EXPECT_EQ(118, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
-  EXPECT_EQ(119, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
-  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
-  EXPECT_EQ(120, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
-  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
-  EXPECT_EQ(126, sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
-  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
-  EXPECT_EQ(127, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-
-  EXPECT_EQ( nested_baz_, reflection->GetEnum(message, F("optional_nested_enum" )));
-  EXPECT_EQ(foreign_baz_, reflection->GetEnum(message, F("optional_foreign_enum")));
-  EXPECT_EQ( import_baz_, reflection->GetEnum(message, F("optional_import_enum" )));
-
-  EXPECT_EQ("124", reflection->GetString(message, F("optional_string_piece")));
-  EXPECT_EQ("124", reflection->GetStringReference(message, F("optional_string_piece"), &scratch));
-
-  EXPECT_EQ("125", reflection->GetString(message, F("optional_cord")));
-  EXPECT_EQ("125", reflection->GetStringReference(message, F("optional_cord"), &scratch));
-
-  EXPECT_TRUE(reflection->HasField(message, F("oneof_bytes" )));
-  EXPECT_EQ("604", reflection->GetString(message, F("oneof_bytes"   )));
-
-  if (base_descriptor_->name() == "TestAllTypes") {
-    EXPECT_FALSE(reflection->HasField(message, F("oneof_uint32")));
-    EXPECT_FALSE(reflection->HasField(message, F("oneof_string")));
-  } else {
-    EXPECT_TRUE(reflection->HasField(message, F("oneof_uint32")));
-    EXPECT_TRUE(reflection->HasField(message, F("oneof_string")));
-    EXPECT_EQ(601  , reflection->GetUInt32(message, F("oneof_uint32")));
-    EXPECT_EQ("603", reflection->GetString(message, F("oneof_string")));
-    sub_message = &reflection->GetMessage(message, F("oneof_nested_message"));
-    EXPECT_EQ(602, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-  }
-}
-
-void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-  string scratch;
-  const Message* sub_message;
-
-  // -----------------------------------------------------------------
-
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_int32"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_int64"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_uint32"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_uint64"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sint32"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sint64"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_fixed32" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_fixed64" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sfixed32")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sfixed64")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_float"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_double"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_bool"    )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_string"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_bytes"   )));
-
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeatedgroup"           )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_message" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_message")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_message" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_lazy_message"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_enum"    )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_enum"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_enum"    )));
-
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_string_piece")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_cord")));
-
-  EXPECT_EQ(201  , reflection->GetRepeatedInt32 (message, F("repeated_int32"   ), 0));
-  EXPECT_EQ(202  , reflection->GetRepeatedInt64 (message, F("repeated_int64"   ), 0));
-  EXPECT_EQ(203  , reflection->GetRepeatedUInt32(message, F("repeated_uint32"  ), 0));
-  EXPECT_EQ(204  , reflection->GetRepeatedUInt64(message, F("repeated_uint64"  ), 0));
-  EXPECT_EQ(205  , reflection->GetRepeatedInt32 (message, F("repeated_sint32"  ), 0));
-  EXPECT_EQ(206  , reflection->GetRepeatedInt64 (message, F("repeated_sint64"  ), 0));
-  EXPECT_EQ(207  , reflection->GetRepeatedUInt32(message, F("repeated_fixed32" ), 0));
-  EXPECT_EQ(208  , reflection->GetRepeatedUInt64(message, F("repeated_fixed64" ), 0));
-  EXPECT_EQ(209  , reflection->GetRepeatedInt32 (message, F("repeated_sfixed32"), 0));
-  EXPECT_EQ(210  , reflection->GetRepeatedInt64 (message, F("repeated_sfixed64"), 0));
-  EXPECT_EQ(211  , reflection->GetRepeatedFloat (message, F("repeated_float"   ), 0));
-  EXPECT_EQ(212  , reflection->GetRepeatedDouble(message, F("repeated_double"  ), 0));
-  EXPECT_TRUE(     reflection->GetRepeatedBool  (message, F("repeated_bool"    ), 0));
-  EXPECT_EQ("215", reflection->GetRepeatedString(message, F("repeated_string"  ), 0));
-  EXPECT_EQ("216", reflection->GetRepeatedString(message, F("repeated_bytes"   ), 0));
-
-  EXPECT_EQ("215", reflection->GetRepeatedStringReference(message, F("repeated_string"), 0, &scratch));
-  EXPECT_EQ("216", reflection->GetRepeatedStringReference(message, F("repeated_bytes"), 0, &scratch));
-
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeatedgroup"), 0);
-  EXPECT_EQ(217, sub_message->GetReflection()->GetInt32(*sub_message, repeated_group_a_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_nested_message"), 0);
-  EXPECT_EQ(218, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_foreign_message"), 0);
-  EXPECT_EQ(219, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 0);
-  EXPECT_EQ(220, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 0);
-  EXPECT_EQ(227, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-
-  EXPECT_EQ( nested_bar_, reflection->GetRepeatedEnum(message, F("repeated_nested_enum" ),0));
-  EXPECT_EQ(foreign_bar_, reflection->GetRepeatedEnum(message, F("repeated_foreign_enum"),0));
-  EXPECT_EQ( import_bar_, reflection->GetRepeatedEnum(message, F("repeated_import_enum" ),0));
-
-  EXPECT_EQ("224", reflection->GetRepeatedString(message, F("repeated_string_piece"), 0));
-  EXPECT_EQ("224", reflection->GetRepeatedStringReference(
-                        message, F("repeated_string_piece"), 0, &scratch));
-
-  EXPECT_EQ("225", reflection->GetRepeatedString(message, F("repeated_cord"), 0));
-  EXPECT_EQ("225", reflection->GetRepeatedStringReference(
-                        message, F("repeated_cord"), 0, &scratch));
-
-  EXPECT_EQ(301  , reflection->GetRepeatedInt32 (message, F("repeated_int32"   ), 1));
-  EXPECT_EQ(302  , reflection->GetRepeatedInt64 (message, F("repeated_int64"   ), 1));
-  EXPECT_EQ(303  , reflection->GetRepeatedUInt32(message, F("repeated_uint32"  ), 1));
-  EXPECT_EQ(304  , reflection->GetRepeatedUInt64(message, F("repeated_uint64"  ), 1));
-  EXPECT_EQ(305  , reflection->GetRepeatedInt32 (message, F("repeated_sint32"  ), 1));
-  EXPECT_EQ(306  , reflection->GetRepeatedInt64 (message, F("repeated_sint64"  ), 1));
-  EXPECT_EQ(307  , reflection->GetRepeatedUInt32(message, F("repeated_fixed32" ), 1));
-  EXPECT_EQ(308  , reflection->GetRepeatedUInt64(message, F("repeated_fixed64" ), 1));
-  EXPECT_EQ(309  , reflection->GetRepeatedInt32 (message, F("repeated_sfixed32"), 1));
-  EXPECT_EQ(310  , reflection->GetRepeatedInt64 (message, F("repeated_sfixed64"), 1));
-  EXPECT_EQ(311  , reflection->GetRepeatedFloat (message, F("repeated_float"   ), 1));
-  EXPECT_EQ(312  , reflection->GetRepeatedDouble(message, F("repeated_double"  ), 1));
-  EXPECT_FALSE(    reflection->GetRepeatedBool  (message, F("repeated_bool"    ), 1));
-  EXPECT_EQ("315", reflection->GetRepeatedString(message, F("repeated_string"  ), 1));
-  EXPECT_EQ("316", reflection->GetRepeatedString(message, F("repeated_bytes"   ), 1));
-
-  EXPECT_EQ("315", reflection->GetRepeatedStringReference(message, F("repeated_string"),
-                                                          1, &scratch));
-  EXPECT_EQ("316", reflection->GetRepeatedStringReference(message, F("repeated_bytes"),
-                                                          1, &scratch));
-
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeatedgroup"), 1);
-  EXPECT_EQ(317, sub_message->GetReflection()->GetInt32(*sub_message, repeated_group_a_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_nested_message"), 1);
-  EXPECT_EQ(318, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_foreign_message"), 1);
-  EXPECT_EQ(319, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 1);
-  EXPECT_EQ(320, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
-  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 1);
-  EXPECT_EQ(327, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-
-  EXPECT_EQ( nested_baz_, reflection->GetRepeatedEnum(message, F("repeated_nested_enum" ),1));
-  EXPECT_EQ(foreign_baz_, reflection->GetRepeatedEnum(message, F("repeated_foreign_enum"),1));
-  EXPECT_EQ( import_baz_, reflection->GetRepeatedEnum(message, F("repeated_import_enum" ),1));
-
-  EXPECT_EQ("324", reflection->GetRepeatedString(message, F("repeated_string_piece"), 1));
-  EXPECT_EQ("324", reflection->GetRepeatedStringReference(
-                        message, F("repeated_string_piece"), 1, &scratch));
-
-  EXPECT_EQ("325", reflection->GetRepeatedString(message, F("repeated_cord"), 1));
-  EXPECT_EQ("325", reflection->GetRepeatedStringReference(
-                        message, F("repeated_cord"), 1, &scratch));
-}
-
-void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection3(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-  string scratch;
-
-  // -----------------------------------------------------------------
-
-  EXPECT_TRUE(reflection->HasField(message, F("default_int32"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_int64"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_uint32"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_uint64"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_sint32"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_sint64"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_fixed32" )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_fixed64" )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_sfixed32")));
-  EXPECT_TRUE(reflection->HasField(message, F("default_sfixed64")));
-  EXPECT_TRUE(reflection->HasField(message, F("default_float"   )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_double"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_bool"    )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_string"  )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_bytes"   )));
-
-  EXPECT_TRUE(reflection->HasField(message, F("default_nested_enum" )));
-  EXPECT_TRUE(reflection->HasField(message, F("default_foreign_enum")));
-  EXPECT_TRUE(reflection->HasField(message, F("default_import_enum" )));
-
-  EXPECT_TRUE(reflection->HasField(message, F("default_string_piece")));
-  EXPECT_TRUE(reflection->HasField(message, F("default_cord")));
-
-  EXPECT_EQ(401  , reflection->GetInt32 (message, F("default_int32"   )));
-  EXPECT_EQ(402  , reflection->GetInt64 (message, F("default_int64"   )));
-  EXPECT_EQ(403  , reflection->GetUInt32(message, F("default_uint32"  )));
-  EXPECT_EQ(404  , reflection->GetUInt64(message, F("default_uint64"  )));
-  EXPECT_EQ(405  , reflection->GetInt32 (message, F("default_sint32"  )));
-  EXPECT_EQ(406  , reflection->GetInt64 (message, F("default_sint64"  )));
-  EXPECT_EQ(407  , reflection->GetUInt32(message, F("default_fixed32" )));
-  EXPECT_EQ(408  , reflection->GetUInt64(message, F("default_fixed64" )));
-  EXPECT_EQ(409  , reflection->GetInt32 (message, F("default_sfixed32")));
-  EXPECT_EQ(410  , reflection->GetInt64 (message, F("default_sfixed64")));
-  EXPECT_EQ(411  , reflection->GetFloat (message, F("default_float"   )));
-  EXPECT_EQ(412  , reflection->GetDouble(message, F("default_double"  )));
-  EXPECT_FALSE(    reflection->GetBool  (message, F("default_bool"    )));
-  EXPECT_EQ("415", reflection->GetString(message, F("default_string"  )));
-  EXPECT_EQ("416", reflection->GetString(message, F("default_bytes"   )));
-
-  EXPECT_EQ("415", reflection->GetStringReference(message, F("default_string"), &scratch));
-  EXPECT_EQ("416", reflection->GetStringReference(message, F("default_bytes" ), &scratch));
-
-  EXPECT_EQ( nested_foo_, reflection->GetEnum(message, F("default_nested_enum" )));
-  EXPECT_EQ(foreign_foo_, reflection->GetEnum(message, F("default_foreign_enum")));
-  EXPECT_EQ( import_foo_, reflection->GetEnum(message, F("default_import_enum" )));
-
-  EXPECT_EQ("424", reflection->GetString(message, F("default_string_piece")));
-  EXPECT_EQ("424", reflection->GetStringReference(message, F("default_string_piece"),
-                                                  &scratch));
-
-  EXPECT_EQ("425", reflection->GetString(message, F("default_cord")));
-  EXPECT_EQ("425", reflection->GetStringReference(message, F("default_cord"), &scratch));
-}
-
-void TestUtil::ReflectionTester::ExpectPackedFieldsSetViaReflection(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_int32"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_int64"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_uint32"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_uint64"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sint32"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sint64"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_fixed32" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_fixed64" )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sfixed32")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sfixed64")));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_float"   )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_double"  )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_bool"    )));
-  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_enum"    )));
-
-  EXPECT_EQ(601  , reflection->GetRepeatedInt32 (message, F("packed_int32"   ), 0));
-  EXPECT_EQ(602  , reflection->GetRepeatedInt64 (message, F("packed_int64"   ), 0));
-  EXPECT_EQ(603  , reflection->GetRepeatedUInt32(message, F("packed_uint32"  ), 0));
-  EXPECT_EQ(604  , reflection->GetRepeatedUInt64(message, F("packed_uint64"  ), 0));
-  EXPECT_EQ(605  , reflection->GetRepeatedInt32 (message, F("packed_sint32"  ), 0));
-  EXPECT_EQ(606  , reflection->GetRepeatedInt64 (message, F("packed_sint64"  ), 0));
-  EXPECT_EQ(607  , reflection->GetRepeatedUInt32(message, F("packed_fixed32" ), 0));
-  EXPECT_EQ(608  , reflection->GetRepeatedUInt64(message, F("packed_fixed64" ), 0));
-  EXPECT_EQ(609  , reflection->GetRepeatedInt32 (message, F("packed_sfixed32"), 0));
-  EXPECT_EQ(610  , reflection->GetRepeatedInt64 (message, F("packed_sfixed64"), 0));
-  EXPECT_EQ(611  , reflection->GetRepeatedFloat (message, F("packed_float"   ), 0));
-  EXPECT_EQ(612  , reflection->GetRepeatedDouble(message, F("packed_double"  ), 0));
-  EXPECT_TRUE(     reflection->GetRepeatedBool  (message, F("packed_bool"    ), 0));
-  EXPECT_EQ(foreign_bar_,
-            reflection->GetRepeatedEnum(message, F("packed_enum"), 0));
-
-  EXPECT_EQ(701  , reflection->GetRepeatedInt32 (message, F("packed_int32"   ), 1));
-  EXPECT_EQ(702  , reflection->GetRepeatedInt64 (message, F("packed_int64"   ), 1));
-  EXPECT_EQ(703  , reflection->GetRepeatedUInt32(message, F("packed_uint32"  ), 1));
-  EXPECT_EQ(704  , reflection->GetRepeatedUInt64(message, F("packed_uint64"  ), 1));
-  EXPECT_EQ(705  , reflection->GetRepeatedInt32 (message, F("packed_sint32"  ), 1));
-  EXPECT_EQ(706  , reflection->GetRepeatedInt64 (message, F("packed_sint64"  ), 1));
-  EXPECT_EQ(707  , reflection->GetRepeatedUInt32(message, F("packed_fixed32" ), 1));
-  EXPECT_EQ(708  , reflection->GetRepeatedUInt64(message, F("packed_fixed64" ), 1));
-  EXPECT_EQ(709  , reflection->GetRepeatedInt32 (message, F("packed_sfixed32"), 1));
-  EXPECT_EQ(710  , reflection->GetRepeatedInt64 (message, F("packed_sfixed64"), 1));
-  EXPECT_EQ(711  , reflection->GetRepeatedFloat (message, F("packed_float"   ), 1));
-  EXPECT_EQ(712  , reflection->GetRepeatedDouble(message, F("packed_double"  ), 1));
-  EXPECT_FALSE(    reflection->GetRepeatedBool  (message, F("packed_bool"    ), 1));
-  EXPECT_EQ(foreign_baz_,
-            reflection->GetRepeatedEnum(message, F("packed_enum"), 1));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ReflectionTester::ExpectClearViaReflection(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-  string scratch;
-  const Message* sub_message;
-
-  // has_blah() should initially be false for all optional fields.
-  EXPECT_FALSE(reflection->HasField(message, F("optional_int32"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_int64"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_uint32"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_uint64"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_sint32"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_sint64"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_fixed32" )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_fixed64" )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_sfixed32")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_sfixed64")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_float"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_double"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_bool"    )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_string"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_bytes"   )));
-
-  EXPECT_FALSE(reflection->HasField(message, F("optionalgroup"           )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_nested_message" )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_message")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_import_message" )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_public_import_message")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_lazy_message")));
-
-  EXPECT_FALSE(reflection->HasField(message, F("optional_nested_enum" )));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_enum")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_import_enum" )));
-
-  EXPECT_FALSE(reflection->HasField(message, F("optional_string_piece")));
-  EXPECT_FALSE(reflection->HasField(message, F("optional_cord")));
-
-  // Optional fields without defaults are set to zero or something like it.
-  EXPECT_EQ(0    , reflection->GetInt32 (message, F("optional_int32"   )));
-  EXPECT_EQ(0    , reflection->GetInt64 (message, F("optional_int64"   )));
-  EXPECT_EQ(0    , reflection->GetUInt32(message, F("optional_uint32"  )));
-  EXPECT_EQ(0    , reflection->GetUInt64(message, F("optional_uint64"  )));
-  EXPECT_EQ(0    , reflection->GetInt32 (message, F("optional_sint32"  )));
-  EXPECT_EQ(0    , reflection->GetInt64 (message, F("optional_sint64"  )));
-  EXPECT_EQ(0    , reflection->GetUInt32(message, F("optional_fixed32" )));
-  EXPECT_EQ(0    , reflection->GetUInt64(message, F("optional_fixed64" )));
-  EXPECT_EQ(0    , reflection->GetInt32 (message, F("optional_sfixed32")));
-  EXPECT_EQ(0    , reflection->GetInt64 (message, F("optional_sfixed64")));
-  EXPECT_EQ(0    , reflection->GetFloat (message, F("optional_float"   )));
-  EXPECT_EQ(0    , reflection->GetDouble(message, F("optional_double"  )));
-  EXPECT_FALSE(    reflection->GetBool  (message, F("optional_bool"    )));
-  EXPECT_EQ(""   , reflection->GetString(message, F("optional_string"  )));
-  EXPECT_EQ(""   , reflection->GetString(message, F("optional_bytes"   )));
-
-  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_string"), &scratch));
-  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_bytes" ), &scratch));
-
-  // Embedded messages should also be clear.
-  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, group_a_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, group_a_));
-  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, foreign_c_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
-  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
-  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
-  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
-  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
-  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
-
-  // Enums without defaults are set to the first value in the enum.
-  EXPECT_EQ( nested_foo_, reflection->GetEnum(message, F("optional_nested_enum" )));
-  EXPECT_EQ(foreign_foo_, reflection->GetEnum(message, F("optional_foreign_enum")));
-  EXPECT_EQ( import_foo_, reflection->GetEnum(message, F("optional_import_enum" )));
-
-  EXPECT_EQ("", reflection->GetString(message, F("optional_string_piece")));
-  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_string_piece"), &scratch));
-
-  EXPECT_EQ("", reflection->GetString(message, F("optional_cord")));
-  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_cord"), &scratch));
-
-  // Repeated fields are empty.
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_int32"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_int64"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_uint32"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_uint64"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sint32"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sint64"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_fixed32" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_fixed64" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sfixed32")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sfixed64")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_float"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_double"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_bool"    )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_string"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_bytes"   )));
-
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeatedgroup"           )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_message" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_message")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_message" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_lazy_message"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_enum"    )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_enum"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_enum"    )));
-
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_string_piece")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_cord")));
-
-  // has_blah() should also be false for all default fields.
-  EXPECT_FALSE(reflection->HasField(message, F("default_int32"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_int64"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_uint32"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_uint64"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_sint32"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_sint64"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_fixed32" )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_fixed64" )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_sfixed32")));
-  EXPECT_FALSE(reflection->HasField(message, F("default_sfixed64")));
-  EXPECT_FALSE(reflection->HasField(message, F("default_float"   )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_double"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_bool"    )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_string"  )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_bytes"   )));
-
-  EXPECT_FALSE(reflection->HasField(message, F("default_nested_enum" )));
-  EXPECT_FALSE(reflection->HasField(message, F("default_foreign_enum")));
-  EXPECT_FALSE(reflection->HasField(message, F("default_import_enum" )));
-
-  EXPECT_FALSE(reflection->HasField(message, F("default_string_piece")));
-  EXPECT_FALSE(reflection->HasField(message, F("default_cord")));
-
-  // Fields with defaults have their default values (duh).
-  EXPECT_EQ( 41    , reflection->GetInt32 (message, F("default_int32"   )));
-  EXPECT_EQ( 42    , reflection->GetInt64 (message, F("default_int64"   )));
-  EXPECT_EQ( 43    , reflection->GetUInt32(message, F("default_uint32"  )));
-  EXPECT_EQ( 44    , reflection->GetUInt64(message, F("default_uint64"  )));
-  EXPECT_EQ(-45    , reflection->GetInt32 (message, F("default_sint32"  )));
-  EXPECT_EQ( 46    , reflection->GetInt64 (message, F("default_sint64"  )));
-  EXPECT_EQ( 47    , reflection->GetUInt32(message, F("default_fixed32" )));
-  EXPECT_EQ( 48    , reflection->GetUInt64(message, F("default_fixed64" )));
-  EXPECT_EQ( 49    , reflection->GetInt32 (message, F("default_sfixed32")));
-  EXPECT_EQ(-50    , reflection->GetInt64 (message, F("default_sfixed64")));
-  EXPECT_EQ( 51.5  , reflection->GetFloat (message, F("default_float"   )));
-  EXPECT_EQ( 52e3  , reflection->GetDouble(message, F("default_double"  )));
-  EXPECT_TRUE(       reflection->GetBool  (message, F("default_bool"    )));
-  EXPECT_EQ("hello", reflection->GetString(message, F("default_string"  )));
-  EXPECT_EQ("world", reflection->GetString(message, F("default_bytes"   )));
-
-  EXPECT_EQ("hello", reflection->GetStringReference(message, F("default_string"), &scratch));
-  EXPECT_EQ("world", reflection->GetStringReference(message, F("default_bytes" ), &scratch));
-
-  EXPECT_EQ( nested_bar_, reflection->GetEnum(message, F("default_nested_enum" )));
-  EXPECT_EQ(foreign_bar_, reflection->GetEnum(message, F("default_foreign_enum")));
-  EXPECT_EQ( import_bar_, reflection->GetEnum(message, F("default_import_enum" )));
-
-  EXPECT_EQ("abc", reflection->GetString(message, F("default_string_piece")));
-  EXPECT_EQ("abc", reflection->GetStringReference(message, F("default_string_piece"), &scratch));
-
-  EXPECT_EQ("123", reflection->GetString(message, F("default_cord")));
-  EXPECT_EQ("123", reflection->GetStringReference(message, F("default_cord"), &scratch));
-}
-
-void TestUtil::ReflectionTester::ExpectPackedClearViaReflection(
-    const Message& message) {
-  const Reflection* reflection = message.GetReflection();
-
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_int32"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_int64"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_uint32"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_uint64"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sint32"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sint64"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_fixed32" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_fixed64" )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sfixed32")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sfixed64")));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_float"   )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_double"  )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_bool"    )));
-  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_enum"    )));
-}
-
-// -------------------------------------------------------------------
-
-void TestUtil::ReflectionTester::ModifyRepeatedFieldsViaReflection(
-    Message* message) {
-  const Reflection* reflection = message->GetReflection();
-  Message* sub_message;
-
-  reflection->SetRepeatedInt32 (message, F("repeated_int32"   ), 1, 501);
-  reflection->SetRepeatedInt64 (message, F("repeated_int64"   ), 1, 502);
-  reflection->SetRepeatedUInt32(message, F("repeated_uint32"  ), 1, 503);
-  reflection->SetRepeatedUInt64(message, F("repeated_uint64"  ), 1, 504);
-  reflection->SetRepeatedInt32 (message, F("repeated_sint32"  ), 1, 505);
-  reflection->SetRepeatedInt64 (message, F("repeated_sint64"  ), 1, 506);
-  reflection->SetRepeatedUInt32(message, F("repeated_fixed32" ), 1, 507);
-  reflection->SetRepeatedUInt64(message, F("repeated_fixed64" ), 1, 508);
-  reflection->SetRepeatedInt32 (message, F("repeated_sfixed32"), 1, 509);
-  reflection->SetRepeatedInt64 (message, F("repeated_sfixed64"), 1, 510);
-  reflection->SetRepeatedFloat (message, F("repeated_float"   ), 1, 511);
-  reflection->SetRepeatedDouble(message, F("repeated_double"  ), 1, 512);
-  reflection->SetRepeatedBool  (message, F("repeated_bool"    ), 1, true);
-  reflection->SetRepeatedString(message, F("repeated_string"  ), 1, "515");
-  reflection->SetRepeatedString(message, F("repeated_bytes"   ), 1, "516");
-
-  sub_message = reflection->MutableRepeatedMessage(message, F("repeatedgroup"), 1);
-  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 517);
-  sub_message = reflection->MutableRepeatedMessage(message, F("repeated_nested_message"), 1);
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 518);
-  sub_message = reflection->MutableRepeatedMessage(message, F("repeated_foreign_message"), 1);
-  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 519);
-  sub_message = reflection->MutableRepeatedMessage(message, F("repeated_import_message"), 1);
-  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 520);
-  sub_message = reflection->MutableRepeatedMessage(message, F("repeated_lazy_message"), 1);
-  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 527);
-
-  reflection->SetRepeatedEnum(message, F("repeated_nested_enum" ), 1,  nested_foo_);
-  reflection->SetRepeatedEnum(message, F("repeated_foreign_enum"), 1, foreign_foo_);
-  reflection->SetRepeatedEnum(message, F("repeated_import_enum" ), 1,  import_foo_);
-
-  reflection->SetRepeatedString(message, F("repeated_string_piece"), 1, "524");
-  reflection->SetRepeatedString(message, F("repeated_cord"), 1, "525");
-}
-
-void TestUtil::ReflectionTester::ModifyPackedFieldsViaReflection(
-    Message* message) {
-  const Reflection* reflection = message->GetReflection();
-  reflection->SetRepeatedInt32 (message, F("packed_int32"   ), 1, 801);
-  reflection->SetRepeatedInt64 (message, F("packed_int64"   ), 1, 802);
-  reflection->SetRepeatedUInt32(message, F("packed_uint32"  ), 1, 803);
-  reflection->SetRepeatedUInt64(message, F("packed_uint64"  ), 1, 804);
-  reflection->SetRepeatedInt32 (message, F("packed_sint32"  ), 1, 805);
-  reflection->SetRepeatedInt64 (message, F("packed_sint64"  ), 1, 806);
-  reflection->SetRepeatedUInt32(message, F("packed_fixed32" ), 1, 807);
-  reflection->SetRepeatedUInt64(message, F("packed_fixed64" ), 1, 808);
-  reflection->SetRepeatedInt32 (message, F("packed_sfixed32"), 1, 809);
-  reflection->SetRepeatedInt64 (message, F("packed_sfixed64"), 1, 810);
-  reflection->SetRepeatedFloat (message, F("packed_float"   ), 1, 811);
-  reflection->SetRepeatedDouble(message, F("packed_double"  ), 1, 812);
-  reflection->SetRepeatedBool  (message, F("packed_bool"    ), 1, true);
-  reflection->SetRepeatedEnum  (message, F("packed_enum"    ), 1, foreign_foo_);
-}
-
-void TestUtil::ReflectionTester::RemoveLastRepeatedsViaReflection(
-    Message* message) {
-  const Reflection* reflection = message->GetReflection();
-
-  std::vector<const FieldDescriptor*> output;
-  reflection->ListFields(*message, &output);
-  for (int i=0; i<output.size(); ++i) {
-    const FieldDescriptor* field = output[i];
-    if (!field->is_repeated()) continue;
-
-    reflection->RemoveLast(message, field);
-  }
-}
-
-void TestUtil::ReflectionTester::ReleaseLastRepeatedsViaReflection(
-    Message* message, bool expect_extensions_notnull) {
-  const Reflection* reflection = message->GetReflection();
-
-  std::vector<const FieldDescriptor*> output;
-  reflection->ListFields(*message, &output);
-  for (int i=0; i<output.size(); ++i) {
-    const FieldDescriptor* field = output[i];
-    if (!field->is_repeated()) continue;
-    if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) continue;
-
-    Message* released = reflection->ReleaseLast(message, field);
-    if (!field->is_extension() || expect_extensions_notnull) {
-      ASSERT_TRUE(released != NULL) << "ReleaseLast returned NULL for: "
-                                    << field->name();
-    }
-    delete released;
-  }
-}
-
-void TestUtil::ReflectionTester::SwapRepeatedsViaReflection(Message* message) {
-  const Reflection* reflection = message->GetReflection();
-
-  std::vector<const FieldDescriptor*> output;
-  reflection->ListFields(*message, &output);
-  for (int i=0; i<output.size(); ++i) {
-    const FieldDescriptor* field = output[i];
-    if (!field->is_repeated()) continue;
-
-    reflection->SwapElements(message, field, 0, 1);
-  }
-}
-
-void TestUtil::ReflectionTester::
-SetAllocatedOptionalMessageFieldsToNullViaReflection(
-    Message* message) {
-  const Reflection* reflection = message->GetReflection();
-
-  std::vector<const FieldDescriptor*> fields;
-  reflection->ListFields(*message, &fields);
-
-  for (int i = 0; i < fields.size(); ++i) {
-    const FieldDescriptor* field = fields[i];
-    if (!field->is_optional() ||
-        field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) continue;
-
-    reflection->SetAllocatedMessage(message, NULL, field);
-  }
-}
-
-void TestUtil::ReflectionTester::
-SetAllocatedOptionalMessageFieldsToMessageViaReflection(
-    Message* from_message,
-    Message* to_message) {
-  EXPECT_EQ(from_message->GetDescriptor(), to_message->GetDescriptor());
-  const Reflection* from_reflection = from_message->GetReflection();
-  const Reflection* to_reflection = to_message->GetReflection();
-
-  std::vector<const FieldDescriptor*> fields;
-  from_reflection->ListFields(*from_message, &fields);
-
-  for (int i = 0; i < fields.size(); ++i) {
-    const FieldDescriptor* field = fields[i];
-    if (!field->is_optional() ||
-        field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) continue;
-
-    Message* sub_message =
-        from_reflection->ReleaseMessage(from_message, field);
-    to_reflection->SetAllocatedMessage(to_message, sub_message, field);
-  }
-}
-
-void TestUtil::ReflectionTester::ExpectMessagesReleasedViaReflection(
-    Message* message,
-    TestUtil::ReflectionTester::MessageReleaseState expected_release_state) {
-  const Reflection* reflection = message->GetReflection();
-
-  static const char* fields[] = {
-    "optionalgroup",
-    "optional_nested_message",
-    "optional_foreign_message",
-    "optional_import_message",
-  };
-  for (int i = 0; i < GOOGLE_ARRAYSIZE(fields); i++) {
-    const Message& sub_message = reflection->GetMessage(*message, F(fields[i]));
-    Message* released = reflection->ReleaseMessage(message, F(fields[i]));
-    switch (expected_release_state) {
-      case IS_NULL:
-        EXPECT_TRUE(released == NULL);
-        break;
-      case NOT_NULL:
-        EXPECT_TRUE(released != NULL);
-        if (message->GetArena() == NULL) {
-          // released message must be same as sub_message if source message is
-          // not on arena.
-          EXPECT_EQ(&sub_message, released);
-        }
-        break;
-      case CAN_BE_NULL:
-        break;
-    }
-    delete released;
-    EXPECT_FALSE(reflection->HasField(*message, F(fields[i])));
-  }
-}
-
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/test_util.h b/src/google/protobuf/test_util.h
index 1c13a1a7..b9abb671 100644
--- a/src/google/protobuf/test_util.h
+++ b/src/google/protobuf/test_util.h
@@ -35,180 +35,1266 @@
 #ifndef GOOGLE_PROTOBUF_TEST_UTIL_H__
 #define GOOGLE_PROTOBUF_TEST_UTIL_H__
 
-#include <stack>
-#include <string>
-#include <google/protobuf/message.h>
 #include <google/protobuf/unittest.pb.h>
 
+#define UNITTEST ::protobuf_unittest
+#define UNITTEST_IMPORT ::protobuf_unittest_import
+// Must be included when the preprocessor symbols above are defined.
+#include <google/protobuf/test_util.inc>
+#undef UNITTEST
+#undef UNITTEST_IMPORT
+
+
 namespace google {
 namespace protobuf {
-
+// This file doesn't use these declarations, but some .cc files do.
 namespace unittest = ::protobuf_unittest;
-namespace unittest_import = protobuf_unittest_import;
+namespace unittest_import = ::protobuf_unittest_import;
 
-class TestUtil {
+namespace TestUtil {
+
+class ReflectionTester {
  public:
-  // Set every field in the message to a unique value.
-  static void SetAllFields(unittest::TestAllTypes* message);
-  static void SetOptionalFields(unittest::TestAllTypes* message);
-  static void AddRepeatedFields1(unittest::TestAllTypes* message);
-  static void AddRepeatedFields2(unittest::TestAllTypes* message);
-  static void SetDefaultFields(unittest::TestAllTypes* message);
-  static void SetOneofFields(unittest::TestAllTypes* message);
-  static void SetAllExtensions(unittest::TestAllExtensions* message);
-  static void SetOneofFields(unittest::TestAllExtensions* message);
-  static void SetAllFieldsAndExtensions(unittest::TestFieldOrderings* message);
-  static void SetPackedFields(unittest::TestPackedTypes* message);
-  static void SetPackedExtensions(unittest::TestPackedExtensions* message);
-  static void SetUnpackedFields(unittest::TestUnpackedTypes* message);
-  static void SetOneof1(unittest::TestOneof2* message);
-  static void SetOneof2(unittest::TestOneof2* message);
-
-  // Use the repeated versions of the set_*() accessors to modify all the
-  // repeated fields of the message (which should already have been
-  // initialized with Set*Fields()).  Set*Fields() itself only tests
-  // the add_*() accessors.
-  static void ModifyRepeatedFields(unittest::TestAllTypes* message);
-  static void ModifyRepeatedExtensions(unittest::TestAllExtensions* message);
-  static void ModifyPackedFields(unittest::TestPackedTypes* message);
-  static void ModifyPackedExtensions(unittest::TestPackedExtensions* message);
-
-  // Check that all fields have the values that they should have after
-  // Set*Fields() is called.
-  static void ExpectAllFieldsSet(const unittest::TestAllTypes& message);
-  static void ExpectAllExtensionsSet(
-      const unittest::TestAllExtensions& message);
-  static void ExpectPackedFieldsSet(const unittest::TestPackedTypes& message);
-  static void ExpectPackedExtensionsSet(
-      const unittest::TestPackedExtensions& message);
-  static void ExpectUnpackedFieldsSet(
-      const unittest::TestUnpackedTypes& message);
-  static void ExpectUnpackedExtensionsSet(
-      const unittest::TestUnpackedExtensions& message);
-  static void ExpectOneofSet1(const unittest::TestOneof2& message);
-  static void ExpectOneofSet2(const unittest::TestOneof2& message);
-
-  // Expect that the message is modified as would be expected from
-  // Modify*Fields().
-  static void ExpectRepeatedFieldsModified(
-      const unittest::TestAllTypes& message);
-  static void ExpectRepeatedExtensionsModified(
-      const unittest::TestAllExtensions& message);
-  static void ExpectPackedFieldsModified(
-      const unittest::TestPackedTypes& message);
-  static void ExpectPackedExtensionsModified(
-      const unittest::TestPackedExtensions& message);
-
-  // Check that all fields have their default values.
-  static void ExpectClear(const unittest::TestAllTypes& message);
-  static void ExpectExtensionsClear(const unittest::TestAllExtensions& message);
-  static void ExpectPackedClear(const unittest::TestPackedTypes& message);
-  static void ExpectPackedExtensionsClear(
-      const unittest::TestPackedExtensions& message);
-  static void ExpectOneofClear(const unittest::TestOneof2& message);
-
-  // Check that the passed-in serialization is the canonical serialization we
-  // expect for a TestFieldOrderings message filled in by
-  // SetAllFieldsAndExtensions().
-  static void ExpectAllFieldsAndExtensionsInOrder(const string& serialized);
-
-  // Check that all repeated fields have had their last elements removed.
-  static void ExpectLastRepeatedsRemoved(
-      const unittest::TestAllTypes& message);
-  static void ExpectLastRepeatedExtensionsRemoved(
-      const unittest::TestAllExtensions& message);
-  static void ExpectLastRepeatedsReleased(
-      const unittest::TestAllTypes& message);
-  static void ExpectLastRepeatedExtensionsReleased(
-      const unittest::TestAllExtensions& message);
-
-  // Check that all repeated fields have had their first and last elements
-  // swapped.
-  static void ExpectRepeatedsSwapped(const unittest::TestAllTypes& message);
-  static void ExpectRepeatedExtensionsSwapped(
-      const unittest::TestAllExtensions& message);
-
-  static void ExpectAtMostOneFieldSetInOneof(
-      const unittest::TestOneof2 &message);
-
-  // Like above, but use the reflection interface.
-  class ReflectionTester {
-   public:
-    // base_descriptor must be a descriptor for TestAllTypes or
-    // TestAllExtensions.  In the former case, ReflectionTester fetches from
-    // it the FieldDescriptors needed to use the reflection interface.  In
-    // the latter case, ReflectionTester searches for extension fields in
-    // its file.
-    explicit ReflectionTester(const Descriptor* base_descriptor);
-
-    void SetAllFieldsViaReflection(Message* message);
-    void ModifyRepeatedFieldsViaReflection(Message* message);
-    void ExpectAllFieldsSetViaReflection(const Message& message);
-    void ExpectClearViaReflection(const Message& message);
-
-    void SetPackedFieldsViaReflection(Message* message);
-    void ModifyPackedFieldsViaReflection(Message* message);
-    void ExpectPackedFieldsSetViaReflection(const Message& message);
-    void ExpectPackedClearViaReflection(const Message& message);
-
-    void RemoveLastRepeatedsViaReflection(Message* message);
-    void ReleaseLastRepeatedsViaReflection(
-        Message* message, bool expect_extensions_notnull);
-    void SwapRepeatedsViaReflection(Message* message);
-    void SetAllocatedOptionalMessageFieldsToNullViaReflection(
-        Message* message);
-    static void SetAllocatedOptionalMessageFieldsToMessageViaReflection(
-        Message* from_message,
-        Message* to_message);
-
-    enum MessageReleaseState {
-      IS_NULL,
-      CAN_BE_NULL,
-      NOT_NULL,
-    };
-    void ExpectMessagesReleasedViaReflection(
-        Message* message, MessageReleaseState expected_release_state);
-
-    // Set and check functions for TestOneof2 messages. No need to construct
-    // the ReflectionTester by TestAllTypes nor TestAllExtensions.
-    static void SetOneofViaReflection(Message* message);
-    static void ExpectOneofSetViaReflection(const Message& message);
-
-   private:
-    const FieldDescriptor* F(const string& name);
-
-    const Descriptor* base_descriptor_;
-
-    const FieldDescriptor* group_a_;
-    const FieldDescriptor* repeated_group_a_;
-    const FieldDescriptor* nested_b_;
-    const FieldDescriptor* foreign_c_;
-    const FieldDescriptor* import_d_;
-    const FieldDescriptor* import_e_;
-
-    const EnumValueDescriptor* nested_foo_;
-    const EnumValueDescriptor* nested_bar_;
-    const EnumValueDescriptor* nested_baz_;
-    const EnumValueDescriptor* foreign_foo_;
-    const EnumValueDescriptor* foreign_bar_;
-    const EnumValueDescriptor* foreign_baz_;
-    const EnumValueDescriptor* import_foo_;
-    const EnumValueDescriptor* import_bar_;
-    const EnumValueDescriptor* import_baz_;
-
-    // We have to split this into three function otherwise it creates a stack
-    // frame so large that it triggers a warning.
-    void ExpectAllFieldsSetViaReflection1(const Message& message);
-    void ExpectAllFieldsSetViaReflection2(const Message& message);
-    void ExpectAllFieldsSetViaReflection3(const Message& message);
-
-    GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ReflectionTester);
+  // base_descriptor must be a descriptor for TestAllTypes or
+  // TestAllExtensions.  In the former case, ReflectionTester fetches from
+  // it the FieldDescriptors needed to use the reflection interface.  In
+  // the latter case, ReflectionTester searches for extension fields in
+  // its file.
+  explicit ReflectionTester(const Descriptor* base_descriptor);
+
+  void SetAllFieldsViaReflection(Message* message);
+  void ModifyRepeatedFieldsViaReflection(Message* message);
+  void ExpectAllFieldsSetViaReflection(const Message& message);
+  void ExpectClearViaReflection(const Message& message);
+
+  void SetPackedFieldsViaReflection(Message* message);
+  void ModifyPackedFieldsViaReflection(Message* message);
+  void ExpectPackedFieldsSetViaReflection(const Message& message);
+  void ExpectPackedClearViaReflection(const Message& message);
+
+  void RemoveLastRepeatedsViaReflection(Message* message);
+  void ReleaseLastRepeatedsViaReflection(Message* message,
+                                         bool expect_extensions_notnull);
+  void SwapRepeatedsViaReflection(Message* message);
+  void SetAllocatedOptionalMessageFieldsToNullViaReflection(Message* message);
+  static void SetAllocatedOptionalMessageFieldsToMessageViaReflection(
+      Message* from_message, Message* to_message);
+
+  enum MessageReleaseState {
+    IS_NULL,
+    CAN_BE_NULL,
+    NOT_NULL,
   };
+  void ExpectMessagesReleasedViaReflection(
+      Message* message, MessageReleaseState expected_release_state);
+
+  // Set and check functions for TestOneof2 messages. No need to construct
+  // the ReflectionTester by TestAllTypes nor TestAllExtensions.
+  static void SetOneofViaReflection(Message* message);
+  static void ExpectOneofSetViaReflection(const Message& message);
 
  private:
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(TestUtil);
+  const FieldDescriptor* F(const string& name);
+
+  const Descriptor* base_descriptor_;
+
+  const FieldDescriptor* group_a_;
+  const FieldDescriptor* repeated_group_a_;
+  const FieldDescriptor* nested_b_;
+  const FieldDescriptor* foreign_c_;
+  const FieldDescriptor* import_d_;
+  const FieldDescriptor* import_e_;
+
+  const EnumValueDescriptor* nested_foo_;
+  const EnumValueDescriptor* nested_bar_;
+  const EnumValueDescriptor* nested_baz_;
+  const EnumValueDescriptor* foreign_foo_;
+  const EnumValueDescriptor* foreign_bar_;
+  const EnumValueDescriptor* foreign_baz_;
+  const EnumValueDescriptor* import_foo_;
+  const EnumValueDescriptor* import_bar_;
+  const EnumValueDescriptor* import_baz_;
+
+  // We have to split this into three function otherwise it creates a stack
+  // frame so large that it triggers a warning.
+  void ExpectAllFieldsSetViaReflection1(const Message& message);
+  void ExpectAllFieldsSetViaReflection2(const Message& message);
+  void ExpectAllFieldsSetViaReflection3(const Message& message);
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ReflectionTester);
 };
 
+inline TestUtil::ReflectionTester::ReflectionTester(
+    const Descriptor* base_descriptor)
+    : base_descriptor_(base_descriptor) {
+  const DescriptorPool* pool = base_descriptor->file()->pool();
+  string package = base_descriptor->file()->package();
+  const FieldDescriptor* import_descriptor =
+      pool->FindFieldByName(package + ".TestAllTypes.optional_import_message");
+  string import_package = import_descriptor->message_type()->file()->package();
+
+  nested_b_ = pool->FindFieldByName(package + ".TestAllTypes.NestedMessage.bb");
+  foreign_c_ = pool->FindFieldByName(package + ".ForeignMessage.c");
+  import_d_ = pool->FindFieldByName(import_package + ".ImportMessage.d");
+  import_e_ = pool->FindFieldByName(import_package + ".PublicImportMessage.e");
+  nested_foo_ = pool->FindEnumValueByName(package + ".TestAllTypes.FOO");
+  nested_bar_ = pool->FindEnumValueByName(package + ".TestAllTypes.BAR");
+  nested_baz_ = pool->FindEnumValueByName(package + ".TestAllTypes.BAZ");
+  foreign_foo_ = pool->FindEnumValueByName(package + ".FOREIGN_FOO");
+  foreign_bar_ = pool->FindEnumValueByName(package + ".FOREIGN_BAR");
+  foreign_baz_ = pool->FindEnumValueByName(package + ".FOREIGN_BAZ");
+  import_foo_ = pool->FindEnumValueByName(import_package + ".IMPORT_FOO");
+  import_bar_ = pool->FindEnumValueByName(import_package + ".IMPORT_BAR");
+  import_baz_ = pool->FindEnumValueByName(import_package + ".IMPORT_BAZ");
+
+  if (base_descriptor_->name() == "TestAllExtensions") {
+    group_a_ = pool->FindFieldByName(package + ".OptionalGroup_extension.a");
+    repeated_group_a_ =
+        pool->FindFieldByName(package + ".RepeatedGroup_extension.a");
+  } else {
+    group_a_ = pool->FindFieldByName(package + ".TestAllTypes.OptionalGroup.a");
+    repeated_group_a_ =
+        pool->FindFieldByName(package + ".TestAllTypes.RepeatedGroup.a");
+  }
+
+  EXPECT_TRUE(group_a_ != nullptr);
+  EXPECT_TRUE(repeated_group_a_ != nullptr);
+  EXPECT_TRUE(nested_b_ != nullptr);
+  EXPECT_TRUE(foreign_c_ != nullptr);
+  EXPECT_TRUE(import_d_ != nullptr);
+  EXPECT_TRUE(import_e_ != nullptr);
+  EXPECT_TRUE(nested_foo_ != nullptr);
+  EXPECT_TRUE(nested_bar_ != nullptr);
+  EXPECT_TRUE(nested_baz_ != nullptr);
+  EXPECT_TRUE(foreign_foo_ != nullptr);
+  EXPECT_TRUE(foreign_bar_ != nullptr);
+  EXPECT_TRUE(foreign_baz_ != nullptr);
+  EXPECT_TRUE(import_foo_ != nullptr);
+  EXPECT_TRUE(import_bar_ != nullptr);
+  EXPECT_TRUE(import_baz_ != nullptr);
+}
+
+// Shorthand to get a FieldDescriptor for a field of TestAllTypes.
+inline const FieldDescriptor* TestUtil::ReflectionTester::F(
+    const string& name) {
+  const FieldDescriptor* result = nullptr;
+  if (base_descriptor_->name() == "TestAllExtensions" ||
+      base_descriptor_->name() == "TestPackedExtensions") {
+    result = base_descriptor_->file()->FindExtensionByName(name + "_extension");
+  } else {
+    result = base_descriptor_->FindFieldByName(name);
+  }
+  GOOGLE_CHECK(result != nullptr);
+  return result;
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ReflectionTester::SetAllFieldsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+  Message* sub_message;
+
+  reflection->SetInt32(message, F("optional_int32"), 101);
+  reflection->SetInt64(message, F("optional_int64"), 102);
+  reflection->SetUInt32(message, F("optional_uint32"), 103);
+  reflection->SetUInt64(message, F("optional_uint64"), 104);
+  reflection->SetInt32(message, F("optional_sint32"), 105);
+  reflection->SetInt64(message, F("optional_sint64"), 106);
+  reflection->SetUInt32(message, F("optional_fixed32"), 107);
+  reflection->SetUInt64(message, F("optional_fixed64"), 108);
+  reflection->SetInt32(message, F("optional_sfixed32"), 109);
+  reflection->SetInt64(message, F("optional_sfixed64"), 110);
+  reflection->SetFloat(message, F("optional_float"), 111);
+  reflection->SetDouble(message, F("optional_double"), 112);
+  reflection->SetBool(message, F("optional_bool"), true);
+  reflection->SetString(message, F("optional_string"), "115");
+  reflection->SetString(message, F("optional_bytes"), "116");
+
+  sub_message = reflection->MutableMessage(message, F("optionalgroup"));
+  sub_message->GetReflection()->SetInt32(sub_message, group_a_, 117);
+  sub_message =
+      reflection->MutableMessage(message, F("optional_nested_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 118);
+  sub_message =
+      reflection->MutableMessage(message, F("optional_foreign_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 119);
+  sub_message =
+      reflection->MutableMessage(message, F("optional_import_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 120);
+
+  reflection->SetEnum(message, F("optional_nested_enum"), nested_baz_);
+  reflection->SetEnum(message, F("optional_foreign_enum"), foreign_baz_);
+  reflection->SetEnum(message, F("optional_import_enum"), import_baz_);
+
+  reflection->SetString(message, F("optional_string_piece"), "124");
+  reflection->SetString(message, F("optional_cord"), "125");
+
+  sub_message =
+      reflection->MutableMessage(message, F("optional_public_import_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, import_e_, 126);
+
+  sub_message = reflection->MutableMessage(message, F("optional_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 127);
+
+  // -----------------------------------------------------------------
+
+  reflection->AddInt32(message, F("repeated_int32"), 201);
+  reflection->AddInt64(message, F("repeated_int64"), 202);
+  reflection->AddUInt32(message, F("repeated_uint32"), 203);
+  reflection->AddUInt64(message, F("repeated_uint64"), 204);
+  reflection->AddInt32(message, F("repeated_sint32"), 205);
+  reflection->AddInt64(message, F("repeated_sint64"), 206);
+  reflection->AddUInt32(message, F("repeated_fixed32"), 207);
+  reflection->AddUInt64(message, F("repeated_fixed64"), 208);
+  reflection->AddInt32(message, F("repeated_sfixed32"), 209);
+  reflection->AddInt64(message, F("repeated_sfixed64"), 210);
+  reflection->AddFloat(message, F("repeated_float"), 211);
+  reflection->AddDouble(message, F("repeated_double"), 212);
+  reflection->AddBool(message, F("repeated_bool"), true);
+  reflection->AddString(message, F("repeated_string"), "215");
+  reflection->AddString(message, F("repeated_bytes"), "216");
+
+  sub_message = reflection->AddMessage(message, F("repeatedgroup"));
+  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 217);
+  sub_message = reflection->AddMessage(message, F("repeated_nested_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 218);
+  sub_message = reflection->AddMessage(message, F("repeated_foreign_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 219);
+  sub_message = reflection->AddMessage(message, F("repeated_import_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 220);
+  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 227);
+
+  reflection->AddEnum(message, F("repeated_nested_enum"), nested_bar_);
+  reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_bar_);
+  reflection->AddEnum(message, F("repeated_import_enum"), import_bar_);
+
+  reflection->AddString(message, F("repeated_string_piece"), "224");
+  reflection->AddString(message, F("repeated_cord"), "225");
+
+  // Add a second one of each field.
+  reflection->AddInt32(message, F("repeated_int32"), 301);
+  reflection->AddInt64(message, F("repeated_int64"), 302);
+  reflection->AddUInt32(message, F("repeated_uint32"), 303);
+  reflection->AddUInt64(message, F("repeated_uint64"), 304);
+  reflection->AddInt32(message, F("repeated_sint32"), 305);
+  reflection->AddInt64(message, F("repeated_sint64"), 306);
+  reflection->AddUInt32(message, F("repeated_fixed32"), 307);
+  reflection->AddUInt64(message, F("repeated_fixed64"), 308);
+  reflection->AddInt32(message, F("repeated_sfixed32"), 309);
+  reflection->AddInt64(message, F("repeated_sfixed64"), 310);
+  reflection->AddFloat(message, F("repeated_float"), 311);
+  reflection->AddDouble(message, F("repeated_double"), 312);
+  reflection->AddBool(message, F("repeated_bool"), false);
+  reflection->AddString(message, F("repeated_string"), "315");
+  reflection->AddString(message, F("repeated_bytes"), "316");
+
+  sub_message = reflection->AddMessage(message, F("repeatedgroup"));
+  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 317);
+  sub_message = reflection->AddMessage(message, F("repeated_nested_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 318);
+  sub_message = reflection->AddMessage(message, F("repeated_foreign_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 319);
+  sub_message = reflection->AddMessage(message, F("repeated_import_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 320);
+  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 327);
+
+  reflection->AddEnum(message, F("repeated_nested_enum"), nested_baz_);
+  reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_baz_);
+  reflection->AddEnum(message, F("repeated_import_enum"), import_baz_);
+
+  reflection->AddString(message, F("repeated_string_piece"), "324");
+  reflection->AddString(message, F("repeated_cord"), "325");
+
+  // -----------------------------------------------------------------
+
+  reflection->SetInt32(message, F("default_int32"), 401);
+  reflection->SetInt64(message, F("default_int64"), 402);
+  reflection->SetUInt32(message, F("default_uint32"), 403);
+  reflection->SetUInt64(message, F("default_uint64"), 404);
+  reflection->SetInt32(message, F("default_sint32"), 405);
+  reflection->SetInt64(message, F("default_sint64"), 406);
+  reflection->SetUInt32(message, F("default_fixed32"), 407);
+  reflection->SetUInt64(message, F("default_fixed64"), 408);
+  reflection->SetInt32(message, F("default_sfixed32"), 409);
+  reflection->SetInt64(message, F("default_sfixed64"), 410);
+  reflection->SetFloat(message, F("default_float"), 411);
+  reflection->SetDouble(message, F("default_double"), 412);
+  reflection->SetBool(message, F("default_bool"), false);
+  reflection->SetString(message, F("default_string"), "415");
+  reflection->SetString(message, F("default_bytes"), "416");
+
+  reflection->SetEnum(message, F("default_nested_enum"), nested_foo_);
+  reflection->SetEnum(message, F("default_foreign_enum"), foreign_foo_);
+  reflection->SetEnum(message, F("default_import_enum"), import_foo_);
+
+  reflection->SetString(message, F("default_string_piece"), "424");
+  reflection->SetString(message, F("default_cord"), "425");
+
+  reflection->SetUInt32(message, F("oneof_uint32"), 601);
+  sub_message = reflection->MutableMessage(message, F("oneof_nested_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 602);
+  reflection->SetString(message, F("oneof_string"), "603");
+  reflection->SetString(message, F("oneof_bytes"), "604");
+}
+
+inline void TestUtil::ReflectionTester::SetOneofViaReflection(
+    Message* message) {
+  const Descriptor* descriptor = message->GetDescriptor();
+  const Reflection* reflection = message->GetReflection();
+  Message* sub_message = reflection->MutableMessage(
+      message, descriptor->FindFieldByName("foo_lazy_message"));
+  sub_message->GetReflection()->SetInt64(
+      sub_message, sub_message->GetDescriptor()->FindFieldByName("qux_int"),
+      100);
+
+  reflection->SetString(message, descriptor->FindFieldByName("bar_cord"),
+                        "101");
+  reflection->SetInt32(message, descriptor->FindFieldByName("baz_int"), 102);
+  reflection->SetString(message, descriptor->FindFieldByName("baz_string"),
+                        "103");
+}
+
+inline void TestUtil::ReflectionTester::ExpectOneofSetViaReflection(
+    const Message& message) {
+  const Descriptor* descriptor = message.GetDescriptor();
+  const Reflection* reflection = message.GetReflection();
+  string scratch;
+  EXPECT_TRUE(reflection->HasField(
+      message, descriptor->FindFieldByName("foo_lazy_message")));
+  EXPECT_TRUE(
+      reflection->HasField(message, descriptor->FindFieldByName("bar_cord")));
+  EXPECT_TRUE(
+      reflection->HasField(message, descriptor->FindFieldByName("baz_int")));
+  EXPECT_TRUE(
+      reflection->HasField(message, descriptor->FindFieldByName("baz_string")));
+
+  const Message* sub_message = &reflection->GetMessage(
+      message, descriptor->FindFieldByName("foo_lazy_message"));
+  EXPECT_EQ(100, sub_message->GetReflection()->GetInt64(
+                     *sub_message,
+                     sub_message->GetDescriptor()->FindFieldByName("qux_int")));
+
+  EXPECT_EQ("101", reflection->GetString(
+                       message, descriptor->FindFieldByName("bar_cord")));
+  EXPECT_EQ("101",
+            reflection->GetStringReference(
+                message, descriptor->FindFieldByName("bar_cord"), &scratch));
+
+  EXPECT_EQ(102, reflection->GetInt32(message,
+                                      descriptor->FindFieldByName("baz_int")));
+
+  EXPECT_EQ("103", reflection->GetString(
+                       message, descriptor->FindFieldByName("baz_string")));
+  EXPECT_EQ("103",
+            reflection->GetStringReference(
+                message, descriptor->FindFieldByName("baz_string"), &scratch));
+}
+
+inline void TestUtil::ReflectionTester::SetPackedFieldsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+  reflection->AddInt32(message, F("packed_int32"), 601);
+  reflection->AddInt64(message, F("packed_int64"), 602);
+  reflection->AddUInt32(message, F("packed_uint32"), 603);
+  reflection->AddUInt64(message, F("packed_uint64"), 604);
+  reflection->AddInt32(message, F("packed_sint32"), 605);
+  reflection->AddInt64(message, F("packed_sint64"), 606);
+  reflection->AddUInt32(message, F("packed_fixed32"), 607);
+  reflection->AddUInt64(message, F("packed_fixed64"), 608);
+  reflection->AddInt32(message, F("packed_sfixed32"), 609);
+  reflection->AddInt64(message, F("packed_sfixed64"), 610);
+  reflection->AddFloat(message, F("packed_float"), 611);
+  reflection->AddDouble(message, F("packed_double"), 612);
+  reflection->AddBool(message, F("packed_bool"), true);
+  reflection->AddEnum(message, F("packed_enum"), foreign_bar_);
+
+  reflection->AddInt32(message, F("packed_int32"), 701);
+  reflection->AddInt64(message, F("packed_int64"), 702);
+  reflection->AddUInt32(message, F("packed_uint32"), 703);
+  reflection->AddUInt64(message, F("packed_uint64"), 704);
+  reflection->AddInt32(message, F("packed_sint32"), 705);
+  reflection->AddInt64(message, F("packed_sint64"), 706);
+  reflection->AddUInt32(message, F("packed_fixed32"), 707);
+  reflection->AddUInt64(message, F("packed_fixed64"), 708);
+  reflection->AddInt32(message, F("packed_sfixed32"), 709);
+  reflection->AddInt64(message, F("packed_sfixed64"), 710);
+  reflection->AddFloat(message, F("packed_float"), 711);
+  reflection->AddDouble(message, F("packed_double"), 712);
+  reflection->AddBool(message, F("packed_bool"), false);
+  reflection->AddEnum(message, F("packed_enum"), foreign_baz_);
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection(
+    const Message& message) {
+  // We have to split this into three function otherwise it creates a stack
+  // frame so large that it triggers a warning.
+  ExpectAllFieldsSetViaReflection1(message);
+  ExpectAllFieldsSetViaReflection2(message);
+  ExpectAllFieldsSetViaReflection3(message);
+}
+
+inline void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+  string scratch;
+  const Message* sub_message;
+
+  EXPECT_TRUE(reflection->HasField(message, F("optional_int32")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_int64")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_uint32")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_uint64")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_sint32")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_sint64")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_fixed32")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_fixed64")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_sfixed32")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_sfixed64")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_float")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_double")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_bool")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_string")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_bytes")));
+
+  EXPECT_TRUE(reflection->HasField(message, F("optionalgroup")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_message")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_message")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_import_message")));
+  EXPECT_TRUE(
+      reflection->HasField(message, F("optional_public_import_message")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_lazy_message")));
+
+  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, group_a_));
+  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
+  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, foreign_c_));
+  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
+  sub_message =
+      &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
+
+  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_enum")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_enum")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_import_enum")));
+
+  EXPECT_TRUE(reflection->HasField(message, F("optional_string_piece")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_cord")));
+
+  EXPECT_EQ(101, reflection->GetInt32(message, F("optional_int32")));
+  EXPECT_EQ(102, reflection->GetInt64(message, F("optional_int64")));
+  EXPECT_EQ(103, reflection->GetUInt32(message, F("optional_uint32")));
+  EXPECT_EQ(104, reflection->GetUInt64(message, F("optional_uint64")));
+  EXPECT_EQ(105, reflection->GetInt32(message, F("optional_sint32")));
+  EXPECT_EQ(106, reflection->GetInt64(message, F("optional_sint64")));
+  EXPECT_EQ(107, reflection->GetUInt32(message, F("optional_fixed32")));
+  EXPECT_EQ(108, reflection->GetUInt64(message, F("optional_fixed64")));
+  EXPECT_EQ(109, reflection->GetInt32(message, F("optional_sfixed32")));
+  EXPECT_EQ(110, reflection->GetInt64(message, F("optional_sfixed64")));
+  EXPECT_EQ(111, reflection->GetFloat(message, F("optional_float")));
+  EXPECT_EQ(112, reflection->GetDouble(message, F("optional_double")));
+  EXPECT_TRUE(reflection->GetBool(message, F("optional_bool")));
+  EXPECT_EQ("115", reflection->GetString(message, F("optional_string")));
+  EXPECT_EQ("116", reflection->GetString(message, F("optional_bytes")));
+
+  EXPECT_EQ("115", reflection->GetStringReference(message, F("optional_string"),
+                                                  &scratch));
+  EXPECT_EQ("116", reflection->GetStringReference(message, F("optional_bytes"),
+                                                  &scratch));
+
+  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
+  EXPECT_EQ(117,
+            sub_message->GetReflection()->GetInt32(*sub_message, group_a_));
+  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
+  EXPECT_EQ(118,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
+  EXPECT_EQ(119,
+            sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
+  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
+  EXPECT_EQ(120,
+            sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message =
+      &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_EQ(126,
+            sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_EQ(127,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+
+  EXPECT_EQ(nested_baz_,
+            reflection->GetEnum(message, F("optional_nested_enum")));
+  EXPECT_EQ(foreign_baz_,
+            reflection->GetEnum(message, F("optional_foreign_enum")));
+  EXPECT_EQ(import_baz_,
+            reflection->GetEnum(message, F("optional_import_enum")));
+
+  EXPECT_EQ("124", reflection->GetString(message, F("optional_string_piece")));
+  EXPECT_EQ("124", reflection->GetStringReference(
+                       message, F("optional_string_piece"), &scratch));
+
+  EXPECT_EQ("125", reflection->GetString(message, F("optional_cord")));
+  EXPECT_EQ("125", reflection->GetStringReference(message, F("optional_cord"),
+                                                  &scratch));
+
+  EXPECT_TRUE(reflection->HasField(message, F("oneof_bytes")));
+  EXPECT_EQ("604", reflection->GetString(message, F("oneof_bytes")));
+
+  if (base_descriptor_->name() == "TestAllTypes") {
+    EXPECT_FALSE(reflection->HasField(message, F("oneof_uint32")));
+    EXPECT_FALSE(reflection->HasField(message, F("oneof_string")));
+  } else {
+    EXPECT_TRUE(reflection->HasField(message, F("oneof_uint32")));
+    EXPECT_TRUE(reflection->HasField(message, F("oneof_string")));
+    EXPECT_EQ(601, reflection->GetUInt32(message, F("oneof_uint32")));
+    EXPECT_EQ("603", reflection->GetString(message, F("oneof_string")));
+    sub_message = &reflection->GetMessage(message, F("oneof_nested_message"));
+    EXPECT_EQ(602,
+              sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+  }
+}
+
+inline void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+  string scratch;
+  const Message* sub_message;
+
+  // -----------------------------------------------------------------
+
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_int32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_int64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_uint32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_uint64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sint32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sint64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_fixed32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_fixed64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sfixed32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_sfixed64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_float")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_double")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_bool")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_string")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_bytes")));
+
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeatedgroup")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_message")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_message")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_message")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_lazy_message")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_enum")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_enum")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_enum")));
+
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_string_piece")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_cord")));
+
+  EXPECT_EQ(201, reflection->GetRepeatedInt32(message, F("repeated_int32"), 0));
+  EXPECT_EQ(202, reflection->GetRepeatedInt64(message, F("repeated_int64"), 0));
+  EXPECT_EQ(203,
+            reflection->GetRepeatedUInt32(message, F("repeated_uint32"), 0));
+  EXPECT_EQ(204,
+            reflection->GetRepeatedUInt64(message, F("repeated_uint64"), 0));
+  EXPECT_EQ(205,
+            reflection->GetRepeatedInt32(message, F("repeated_sint32"), 0));
+  EXPECT_EQ(206,
+            reflection->GetRepeatedInt64(message, F("repeated_sint64"), 0));
+  EXPECT_EQ(207,
+            reflection->GetRepeatedUInt32(message, F("repeated_fixed32"), 0));
+  EXPECT_EQ(208,
+            reflection->GetRepeatedUInt64(message, F("repeated_fixed64"), 0));
+  EXPECT_EQ(209,
+            reflection->GetRepeatedInt32(message, F("repeated_sfixed32"), 0));
+  EXPECT_EQ(210,
+            reflection->GetRepeatedInt64(message, F("repeated_sfixed64"), 0));
+  EXPECT_EQ(211, reflection->GetRepeatedFloat(message, F("repeated_float"), 0));
+  EXPECT_EQ(212,
+            reflection->GetRepeatedDouble(message, F("repeated_double"), 0));
+  EXPECT_TRUE(reflection->GetRepeatedBool(message, F("repeated_bool"), 0));
+  EXPECT_EQ("215",
+            reflection->GetRepeatedString(message, F("repeated_string"), 0));
+  EXPECT_EQ("216",
+            reflection->GetRepeatedString(message, F("repeated_bytes"), 0));
+
+  EXPECT_EQ("215", reflection->GetRepeatedStringReference(
+                       message, F("repeated_string"), 0, &scratch));
+  EXPECT_EQ("216", reflection->GetRepeatedStringReference(
+                       message, F("repeated_bytes"), 0, &scratch));
+
+  sub_message = &reflection->GetRepeatedMessage(message, F("repeatedgroup"), 0);
+  EXPECT_EQ(217, sub_message->GetReflection()->GetInt32(*sub_message,
+                                                        repeated_group_a_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_nested_message"), 0);
+  EXPECT_EQ(218,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+  sub_message = &reflection->GetRepeatedMessage(
+      message, F("repeated_foreign_message"), 0);
+  EXPECT_EQ(219,
+            sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 0);
+  EXPECT_EQ(220,
+            sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 0);
+  EXPECT_EQ(227,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+
+  EXPECT_EQ(nested_bar_,
+            reflection->GetRepeatedEnum(message, F("repeated_nested_enum"), 0));
+  EXPECT_EQ(foreign_bar_, reflection->GetRepeatedEnum(
+                              message, F("repeated_foreign_enum"), 0));
+  EXPECT_EQ(import_bar_,
+            reflection->GetRepeatedEnum(message, F("repeated_import_enum"), 0));
+
+  EXPECT_EQ("224", reflection->GetRepeatedString(
+                       message, F("repeated_string_piece"), 0));
+  EXPECT_EQ("224", reflection->GetRepeatedStringReference(
+                       message, F("repeated_string_piece"), 0, &scratch));
+
+  EXPECT_EQ("225",
+            reflection->GetRepeatedString(message, F("repeated_cord"), 0));
+  EXPECT_EQ("225", reflection->GetRepeatedStringReference(
+                       message, F("repeated_cord"), 0, &scratch));
+
+  EXPECT_EQ(301, reflection->GetRepeatedInt32(message, F("repeated_int32"), 1));
+  EXPECT_EQ(302, reflection->GetRepeatedInt64(message, F("repeated_int64"), 1));
+  EXPECT_EQ(303,
+            reflection->GetRepeatedUInt32(message, F("repeated_uint32"), 1));
+  EXPECT_EQ(304,
+            reflection->GetRepeatedUInt64(message, F("repeated_uint64"), 1));
+  EXPECT_EQ(305,
+            reflection->GetRepeatedInt32(message, F("repeated_sint32"), 1));
+  EXPECT_EQ(306,
+            reflection->GetRepeatedInt64(message, F("repeated_sint64"), 1));
+  EXPECT_EQ(307,
+            reflection->GetRepeatedUInt32(message, F("repeated_fixed32"), 1));
+  EXPECT_EQ(308,
+            reflection->GetRepeatedUInt64(message, F("repeated_fixed64"), 1));
+  EXPECT_EQ(309,
+            reflection->GetRepeatedInt32(message, F("repeated_sfixed32"), 1));
+  EXPECT_EQ(310,
+            reflection->GetRepeatedInt64(message, F("repeated_sfixed64"), 1));
+  EXPECT_EQ(311, reflection->GetRepeatedFloat(message, F("repeated_float"), 1));
+  EXPECT_EQ(312,
+            reflection->GetRepeatedDouble(message, F("repeated_double"), 1));
+  EXPECT_FALSE(reflection->GetRepeatedBool(message, F("repeated_bool"), 1));
+  EXPECT_EQ("315",
+            reflection->GetRepeatedString(message, F("repeated_string"), 1));
+  EXPECT_EQ("316",
+            reflection->GetRepeatedString(message, F("repeated_bytes"), 1));
+
+  EXPECT_EQ("315", reflection->GetRepeatedStringReference(
+                       message, F("repeated_string"), 1, &scratch));
+  EXPECT_EQ("316", reflection->GetRepeatedStringReference(
+                       message, F("repeated_bytes"), 1, &scratch));
+
+  sub_message = &reflection->GetRepeatedMessage(message, F("repeatedgroup"), 1);
+  EXPECT_EQ(317, sub_message->GetReflection()->GetInt32(*sub_message,
+                                                        repeated_group_a_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_nested_message"), 1);
+  EXPECT_EQ(318,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+  sub_message = &reflection->GetRepeatedMessage(
+      message, F("repeated_foreign_message"), 1);
+  EXPECT_EQ(319,
+            sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 1);
+  EXPECT_EQ(320,
+            sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message =
+      &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 1);
+  EXPECT_EQ(327,
+            sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+
+  EXPECT_EQ(nested_baz_,
+            reflection->GetRepeatedEnum(message, F("repeated_nested_enum"), 1));
+  EXPECT_EQ(foreign_baz_, reflection->GetRepeatedEnum(
+                              message, F("repeated_foreign_enum"), 1));
+  EXPECT_EQ(import_baz_,
+            reflection->GetRepeatedEnum(message, F("repeated_import_enum"), 1));
+
+  EXPECT_EQ("324", reflection->GetRepeatedString(
+                       message, F("repeated_string_piece"), 1));
+  EXPECT_EQ("324", reflection->GetRepeatedStringReference(
+                       message, F("repeated_string_piece"), 1, &scratch));
+
+  EXPECT_EQ("325",
+            reflection->GetRepeatedString(message, F("repeated_cord"), 1));
+  EXPECT_EQ("325", reflection->GetRepeatedStringReference(
+                       message, F("repeated_cord"), 1, &scratch));
+}
+
+inline void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection3(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+  string scratch;
+
+  // -----------------------------------------------------------------
+
+  EXPECT_TRUE(reflection->HasField(message, F("default_int32")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_int64")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_uint32")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_uint64")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_sint32")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_sint64")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_fixed32")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_fixed64")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_sfixed32")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_sfixed64")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_float")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_double")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_bool")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_string")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_bytes")));
+
+  EXPECT_TRUE(reflection->HasField(message, F("default_nested_enum")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_foreign_enum")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_import_enum")));
+
+  EXPECT_TRUE(reflection->HasField(message, F("default_string_piece")));
+  EXPECT_TRUE(reflection->HasField(message, F("default_cord")));
+
+  EXPECT_EQ(401, reflection->GetInt32(message, F("default_int32")));
+  EXPECT_EQ(402, reflection->GetInt64(message, F("default_int64")));
+  EXPECT_EQ(403, reflection->GetUInt32(message, F("default_uint32")));
+  EXPECT_EQ(404, reflection->GetUInt64(message, F("default_uint64")));
+  EXPECT_EQ(405, reflection->GetInt32(message, F("default_sint32")));
+  EXPECT_EQ(406, reflection->GetInt64(message, F("default_sint64")));
+  EXPECT_EQ(407, reflection->GetUInt32(message, F("default_fixed32")));
+  EXPECT_EQ(408, reflection->GetUInt64(message, F("default_fixed64")));
+  EXPECT_EQ(409, reflection->GetInt32(message, F("default_sfixed32")));
+  EXPECT_EQ(410, reflection->GetInt64(message, F("default_sfixed64")));
+  EXPECT_EQ(411, reflection->GetFloat(message, F("default_float")));
+  EXPECT_EQ(412, reflection->GetDouble(message, F("default_double")));
+  EXPECT_FALSE(reflection->GetBool(message, F("default_bool")));
+  EXPECT_EQ("415", reflection->GetString(message, F("default_string")));
+  EXPECT_EQ("416", reflection->GetString(message, F("default_bytes")));
+
+  EXPECT_EQ("415", reflection->GetStringReference(message, F("default_string"),
+                                                  &scratch));
+  EXPECT_EQ("416", reflection->GetStringReference(message, F("default_bytes"),
+                                                  &scratch));
+
+  EXPECT_EQ(nested_foo_,
+            reflection->GetEnum(message, F("default_nested_enum")));
+  EXPECT_EQ(foreign_foo_,
+            reflection->GetEnum(message, F("default_foreign_enum")));
+  EXPECT_EQ(import_foo_,
+            reflection->GetEnum(message, F("default_import_enum")));
+
+  EXPECT_EQ("424", reflection->GetString(message, F("default_string_piece")));
+  EXPECT_EQ("424", reflection->GetStringReference(
+                       message, F("default_string_piece"), &scratch));
+
+  EXPECT_EQ("425", reflection->GetString(message, F("default_cord")));
+  EXPECT_EQ("425", reflection->GetStringReference(message, F("default_cord"),
+                                                  &scratch));
+}
+
+inline void TestUtil::ReflectionTester::ExpectPackedFieldsSetViaReflection(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_int32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_int64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_uint32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_uint64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sint32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sint64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_fixed32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_fixed64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sfixed32")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_sfixed64")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_float")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_double")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_bool")));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("packed_enum")));
+
+  EXPECT_EQ(601, reflection->GetRepeatedInt32(message, F("packed_int32"), 0));
+  EXPECT_EQ(602, reflection->GetRepeatedInt64(message, F("packed_int64"), 0));
+  EXPECT_EQ(603, reflection->GetRepeatedUInt32(message, F("packed_uint32"), 0));
+  EXPECT_EQ(604, reflection->GetRepeatedUInt64(message, F("packed_uint64"), 0));
+  EXPECT_EQ(605, reflection->GetRepeatedInt32(message, F("packed_sint32"), 0));
+  EXPECT_EQ(606, reflection->GetRepeatedInt64(message, F("packed_sint64"), 0));
+  EXPECT_EQ(607,
+            reflection->GetRepeatedUInt32(message, F("packed_fixed32"), 0));
+  EXPECT_EQ(608,
+            reflection->GetRepeatedUInt64(message, F("packed_fixed64"), 0));
+  EXPECT_EQ(609,
+            reflection->GetRepeatedInt32(message, F("packed_sfixed32"), 0));
+  EXPECT_EQ(610,
+            reflection->GetRepeatedInt64(message, F("packed_sfixed64"), 0));
+  EXPECT_EQ(611, reflection->GetRepeatedFloat(message, F("packed_float"), 0));
+  EXPECT_EQ(612, reflection->GetRepeatedDouble(message, F("packed_double"), 0));
+  EXPECT_TRUE(reflection->GetRepeatedBool(message, F("packed_bool"), 0));
+  EXPECT_EQ(foreign_bar_,
+            reflection->GetRepeatedEnum(message, F("packed_enum"), 0));
+
+  EXPECT_EQ(701, reflection->GetRepeatedInt32(message, F("packed_int32"), 1));
+  EXPECT_EQ(702, reflection->GetRepeatedInt64(message, F("packed_int64"), 1));
+  EXPECT_EQ(703, reflection->GetRepeatedUInt32(message, F("packed_uint32"), 1));
+  EXPECT_EQ(704, reflection->GetRepeatedUInt64(message, F("packed_uint64"), 1));
+  EXPECT_EQ(705, reflection->GetRepeatedInt32(message, F("packed_sint32"), 1));
+  EXPECT_EQ(706, reflection->GetRepeatedInt64(message, F("packed_sint64"), 1));
+  EXPECT_EQ(707,
+            reflection->GetRepeatedUInt32(message, F("packed_fixed32"), 1));
+  EXPECT_EQ(708,
+            reflection->GetRepeatedUInt64(message, F("packed_fixed64"), 1));
+  EXPECT_EQ(709,
+            reflection->GetRepeatedInt32(message, F("packed_sfixed32"), 1));
+  EXPECT_EQ(710,
+            reflection->GetRepeatedInt64(message, F("packed_sfixed64"), 1));
+  EXPECT_EQ(711, reflection->GetRepeatedFloat(message, F("packed_float"), 1));
+  EXPECT_EQ(712, reflection->GetRepeatedDouble(message, F("packed_double"), 1));
+  EXPECT_FALSE(reflection->GetRepeatedBool(message, F("packed_bool"), 1));
+  EXPECT_EQ(foreign_baz_,
+            reflection->GetRepeatedEnum(message, F("packed_enum"), 1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ReflectionTester::ExpectClearViaReflection(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+  string scratch;
+  const Message* sub_message;
+
+  // has_blah() should initially be false for all optional fields.
+  EXPECT_FALSE(reflection->HasField(message, F("optional_int32")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_int64")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_uint32")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_uint64")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_sint32")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_sint64")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_fixed32")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_fixed64")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_sfixed32")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_sfixed64")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_float")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_double")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_bool")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_string")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_bytes")));
+
+  EXPECT_FALSE(reflection->HasField(message, F("optionalgroup")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_nested_message")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_message")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_import_message")));
+  EXPECT_FALSE(
+      reflection->HasField(message, F("optional_public_import_message")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_lazy_message")));
+
+  EXPECT_FALSE(reflection->HasField(message, F("optional_nested_enum")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_enum")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_import_enum")));
+
+  EXPECT_FALSE(reflection->HasField(message, F("optional_string_piece")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_cord")));
+
+  // Optional fields without defaults are set to zero or something like it.
+  EXPECT_EQ(0, reflection->GetInt32(message, F("optional_int32")));
+  EXPECT_EQ(0, reflection->GetInt64(message, F("optional_int64")));
+  EXPECT_EQ(0, reflection->GetUInt32(message, F("optional_uint32")));
+  EXPECT_EQ(0, reflection->GetUInt64(message, F("optional_uint64")));
+  EXPECT_EQ(0, reflection->GetInt32(message, F("optional_sint32")));
+  EXPECT_EQ(0, reflection->GetInt64(message, F("optional_sint64")));
+  EXPECT_EQ(0, reflection->GetUInt32(message, F("optional_fixed32")));
+  EXPECT_EQ(0, reflection->GetUInt64(message, F("optional_fixed64")));
+  EXPECT_EQ(0, reflection->GetInt32(message, F("optional_sfixed32")));
+  EXPECT_EQ(0, reflection->GetInt64(message, F("optional_sfixed64")));
+  EXPECT_EQ(0, reflection->GetFloat(message, F("optional_float")));
+  EXPECT_EQ(0, reflection->GetDouble(message, F("optional_double")));
+  EXPECT_FALSE(reflection->GetBool(message, F("optional_bool")));
+  EXPECT_EQ("", reflection->GetString(message, F("optional_string")));
+  EXPECT_EQ("", reflection->GetString(message, F("optional_bytes")));
+
+  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_string"),
+                                               &scratch));
+  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_bytes"),
+                                               &scratch));
+
+  // Embedded messages should also be clear.
+  sub_message = &reflection->GetMessage(message, F("optionalgroup"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, group_a_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, group_a_));
+  sub_message = &reflection->GetMessage(message, F("optional_nested_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+  sub_message = &reflection->GetMessage(message, F("optional_foreign_message"));
+  EXPECT_FALSE(
+      sub_message->GetReflection()->HasField(*sub_message, foreign_c_));
+  EXPECT_EQ(0,
+            sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
+  sub_message = &reflection->GetMessage(message, F("optional_import_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message =
+      &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
+
+  // Enums without defaults are set to the first value in the enum.
+  EXPECT_EQ(nested_foo_,
+            reflection->GetEnum(message, F("optional_nested_enum")));
+  EXPECT_EQ(foreign_foo_,
+            reflection->GetEnum(message, F("optional_foreign_enum")));
+  EXPECT_EQ(import_foo_,
+            reflection->GetEnum(message, F("optional_import_enum")));
+
+  EXPECT_EQ("", reflection->GetString(message, F("optional_string_piece")));
+  EXPECT_EQ("", reflection->GetStringReference(
+                    message, F("optional_string_piece"), &scratch));
+
+  EXPECT_EQ("", reflection->GetString(message, F("optional_cord")));
+  EXPECT_EQ("", reflection->GetStringReference(message, F("optional_cord"),
+                                               &scratch));
+
+  // Repeated fields are empty.
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_int32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_int64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_uint32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_uint64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sint32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sint64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_fixed32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_fixed64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sfixed32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_sfixed64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_float")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_double")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_bool")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_string")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_bytes")));
+
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeatedgroup")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_message")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_message")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_message")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_lazy_message")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_enum")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_enum")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_enum")));
+
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_string_piece")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_cord")));
+
+  // has_blah() should also be false for all default fields.
+  EXPECT_FALSE(reflection->HasField(message, F("default_int32")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_int64")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_uint32")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_uint64")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_sint32")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_sint64")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_fixed32")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_fixed64")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_sfixed32")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_sfixed64")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_float")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_double")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_bool")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_string")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_bytes")));
+
+  EXPECT_FALSE(reflection->HasField(message, F("default_nested_enum")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_foreign_enum")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_import_enum")));
+
+  EXPECT_FALSE(reflection->HasField(message, F("default_string_piece")));
+  EXPECT_FALSE(reflection->HasField(message, F("default_cord")));
+
+  // Fields with defaults have their default values (duh).
+  EXPECT_EQ(41, reflection->GetInt32(message, F("default_int32")));
+  EXPECT_EQ(42, reflection->GetInt64(message, F("default_int64")));
+  EXPECT_EQ(43, reflection->GetUInt32(message, F("default_uint32")));
+  EXPECT_EQ(44, reflection->GetUInt64(message, F("default_uint64")));
+  EXPECT_EQ(-45, reflection->GetInt32(message, F("default_sint32")));
+  EXPECT_EQ(46, reflection->GetInt64(message, F("default_sint64")));
+  EXPECT_EQ(47, reflection->GetUInt32(message, F("default_fixed32")));
+  EXPECT_EQ(48, reflection->GetUInt64(message, F("default_fixed64")));
+  EXPECT_EQ(49, reflection->GetInt32(message, F("default_sfixed32")));
+  EXPECT_EQ(-50, reflection->GetInt64(message, F("default_sfixed64")));
+  EXPECT_EQ(51.5, reflection->GetFloat(message, F("default_float")));
+  EXPECT_EQ(52e3, reflection->GetDouble(message, F("default_double")));
+  EXPECT_TRUE(reflection->GetBool(message, F("default_bool")));
+  EXPECT_EQ("hello", reflection->GetString(message, F("default_string")));
+  EXPECT_EQ("world", reflection->GetString(message, F("default_bytes")));
+
+  EXPECT_EQ("hello", reflection->GetStringReference(
+                         message, F("default_string"), &scratch));
+  EXPECT_EQ("world", reflection->GetStringReference(message, F("default_bytes"),
+                                                    &scratch));
+
+  EXPECT_EQ(nested_bar_,
+            reflection->GetEnum(message, F("default_nested_enum")));
+  EXPECT_EQ(foreign_bar_,
+            reflection->GetEnum(message, F("default_foreign_enum")));
+  EXPECT_EQ(import_bar_,
+            reflection->GetEnum(message, F("default_import_enum")));
+
+  EXPECT_EQ("abc", reflection->GetString(message, F("default_string_piece")));
+  EXPECT_EQ("abc", reflection->GetStringReference(
+                       message, F("default_string_piece"), &scratch));
+
+  EXPECT_EQ("123", reflection->GetString(message, F("default_cord")));
+  EXPECT_EQ("123", reflection->GetStringReference(message, F("default_cord"),
+                                                  &scratch));
+}
+
+inline void TestUtil::ReflectionTester::ExpectPackedClearViaReflection(
+    const Message& message) {
+  const Reflection* reflection = message.GetReflection();
+
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_int32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_int64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_uint32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_uint64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sint32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sint64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_fixed32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_fixed64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sfixed32")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_sfixed64")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_float")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_double")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_bool")));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("packed_enum")));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ReflectionTester::ModifyRepeatedFieldsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+  Message* sub_message;
+
+  reflection->SetRepeatedInt32(message, F("repeated_int32"), 1, 501);
+  reflection->SetRepeatedInt64(message, F("repeated_int64"), 1, 502);
+  reflection->SetRepeatedUInt32(message, F("repeated_uint32"), 1, 503);
+  reflection->SetRepeatedUInt64(message, F("repeated_uint64"), 1, 504);
+  reflection->SetRepeatedInt32(message, F("repeated_sint32"), 1, 505);
+  reflection->SetRepeatedInt64(message, F("repeated_sint64"), 1, 506);
+  reflection->SetRepeatedUInt32(message, F("repeated_fixed32"), 1, 507);
+  reflection->SetRepeatedUInt64(message, F("repeated_fixed64"), 1, 508);
+  reflection->SetRepeatedInt32(message, F("repeated_sfixed32"), 1, 509);
+  reflection->SetRepeatedInt64(message, F("repeated_sfixed64"), 1, 510);
+  reflection->SetRepeatedFloat(message, F("repeated_float"), 1, 511);
+  reflection->SetRepeatedDouble(message, F("repeated_double"), 1, 512);
+  reflection->SetRepeatedBool(message, F("repeated_bool"), 1, true);
+  reflection->SetRepeatedString(message, F("repeated_string"), 1, "515");
+  reflection->SetRepeatedString(message, F("repeated_bytes"), 1, "516");
+
+  sub_message =
+      reflection->MutableRepeatedMessage(message, F("repeatedgroup"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, repeated_group_a_, 517);
+  sub_message = reflection->MutableRepeatedMessage(
+      message, F("repeated_nested_message"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 518);
+  sub_message = reflection->MutableRepeatedMessage(
+      message, F("repeated_foreign_message"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 519);
+  sub_message = reflection->MutableRepeatedMessage(
+      message, F("repeated_import_message"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, import_d_, 520);
+  sub_message = reflection->MutableRepeatedMessage(
+      message, F("repeated_lazy_message"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 527);
+
+  reflection->SetRepeatedEnum(message, F("repeated_nested_enum"), 1,
+                              nested_foo_);
+  reflection->SetRepeatedEnum(message, F("repeated_foreign_enum"), 1,
+                              foreign_foo_);
+  reflection->SetRepeatedEnum(message, F("repeated_import_enum"), 1,
+                              import_foo_);
+
+  reflection->SetRepeatedString(message, F("repeated_string_piece"), 1, "524");
+  reflection->SetRepeatedString(message, F("repeated_cord"), 1, "525");
+}
+
+inline void TestUtil::ReflectionTester::ModifyPackedFieldsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+  reflection->SetRepeatedInt32(message, F("packed_int32"), 1, 801);
+  reflection->SetRepeatedInt64(message, F("packed_int64"), 1, 802);
+  reflection->SetRepeatedUInt32(message, F("packed_uint32"), 1, 803);
+  reflection->SetRepeatedUInt64(message, F("packed_uint64"), 1, 804);
+  reflection->SetRepeatedInt32(message, F("packed_sint32"), 1, 805);
+  reflection->SetRepeatedInt64(message, F("packed_sint64"), 1, 806);
+  reflection->SetRepeatedUInt32(message, F("packed_fixed32"), 1, 807);
+  reflection->SetRepeatedUInt64(message, F("packed_fixed64"), 1, 808);
+  reflection->SetRepeatedInt32(message, F("packed_sfixed32"), 1, 809);
+  reflection->SetRepeatedInt64(message, F("packed_sfixed64"), 1, 810);
+  reflection->SetRepeatedFloat(message, F("packed_float"), 1, 811);
+  reflection->SetRepeatedDouble(message, F("packed_double"), 1, 812);
+  reflection->SetRepeatedBool(message, F("packed_bool"), 1, true);
+  reflection->SetRepeatedEnum(message, F("packed_enum"), 1, foreign_foo_);
+}
+
+inline void TestUtil::ReflectionTester::RemoveLastRepeatedsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+
+  std::vector<const FieldDescriptor*> output;
+  reflection->ListFields(*message, &output);
+  for (int i = 0; i < output.size(); ++i) {
+    const FieldDescriptor* field = output[i];
+    if (!field->is_repeated()) continue;
+
+    reflection->RemoveLast(message, field);
+  }
+}
+
+inline void TestUtil::ReflectionTester::ReleaseLastRepeatedsViaReflection(
+    Message* message, bool expect_extensions_notnull) {
+  const Reflection* reflection = message->GetReflection();
+
+  std::vector<const FieldDescriptor*> output;
+  reflection->ListFields(*message, &output);
+  for (int i = 0; i < output.size(); ++i) {
+    const FieldDescriptor* field = output[i];
+    if (!field->is_repeated()) continue;
+    if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) continue;
+
+    Message* released = reflection->ReleaseLast(message, field);
+    if (!field->is_extension() || expect_extensions_notnull) {
+      ASSERT_TRUE(released != nullptr)
+          << "ReleaseLast returned nullptr for: " << field->name();
+    }
+    delete released;
+  }
+}
+
+inline void TestUtil::ReflectionTester::SwapRepeatedsViaReflection(
+    Message* message) {
+  const Reflection* reflection = message->GetReflection();
+
+  std::vector<const FieldDescriptor*> output;
+  reflection->ListFields(*message, &output);
+  for (int i = 0; i < output.size(); ++i) {
+    const FieldDescriptor* field = output[i];
+    if (!field->is_repeated()) continue;
+
+    reflection->SwapElements(message, field, 0, 1);
+  }
+}
+
+inline void TestUtil::ReflectionTester::
+    SetAllocatedOptionalMessageFieldsToNullViaReflection(Message* message) {
+  const Reflection* reflection = message->GetReflection();
+
+  std::vector<const FieldDescriptor*> fields;
+  reflection->ListFields(*message, &fields);
+
+  for (int i = 0; i < fields.size(); ++i) {
+    const FieldDescriptor* field = fields[i];
+    if (!field->is_optional() ||
+        field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE)
+      continue;
+
+    reflection->SetAllocatedMessage(message, nullptr, field);
+  }
+}
+
+inline void TestUtil::ReflectionTester::
+    SetAllocatedOptionalMessageFieldsToMessageViaReflection(
+        Message* from_message, Message* to_message) {
+  EXPECT_EQ(from_message->GetDescriptor(), to_message->GetDescriptor());
+  const Reflection* from_reflection = from_message->GetReflection();
+  const Reflection* to_reflection = to_message->GetReflection();
+
+  std::vector<const FieldDescriptor*> fields;
+  from_reflection->ListFields(*from_message, &fields);
+
+  for (int i = 0; i < fields.size(); ++i) {
+    const FieldDescriptor* field = fields[i];
+    if (!field->is_optional() ||
+        field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE)
+      continue;
+
+    Message* sub_message = from_reflection->ReleaseMessage(from_message, field);
+    to_reflection->SetAllocatedMessage(to_message, sub_message, field);
+  }
+}
+
+inline void TestUtil::ReflectionTester::ExpectMessagesReleasedViaReflection(
+    Message* message,
+    TestUtil::ReflectionTester::MessageReleaseState expected_release_state) {
+  const Reflection* reflection = message->GetReflection();
+
+  static const char* fields[] = {
+      "optionalgroup",
+      "optional_nested_message",
+      "optional_foreign_message",
+      "optional_import_message",
+  };
+  for (int i = 0; i < GOOGLE_ARRAYSIZE(fields); i++) {
+    const Message& sub_message = reflection->GetMessage(*message, F(fields[i]));
+    Message* released = reflection->ReleaseMessage(message, F(fields[i]));
+    switch (expected_release_state) {
+      case IS_NULL:
+        EXPECT_TRUE(released == nullptr);
+        break;
+      case NOT_NULL:
+        EXPECT_TRUE(released != nullptr);
+        if (message->GetArena() == nullptr) {
+          // released message must be same as sub_message if source message is
+          // not on arena.
+          EXPECT_EQ(&sub_message, released);
+        }
+        break;
+      case CAN_BE_NULL:
+        break;
+    }
+    delete released;
+    EXPECT_FALSE(reflection->HasField(*message, F(fields[i])));
+  }
+}
+
+// Check that the passed-in serialization is the canonical serialization we
+// expect for a TestFieldOrderings message filled in by
+// SetAllFieldsAndExtensions().
+inline void ExpectAllFieldsAndExtensionsInOrder(
+    const string& serialized) {
+  // We set each field individually, serialize separately, and concatenate all
+  // the strings in canonical order to determine the expected serialization.
+  string expected;
+  unittest::TestFieldOrderings message;
+  message.set_my_int(1);  // Field 1.
+  message.AppendToString(&expected);
+  message.Clear();
+  message.SetExtension(unittest::my_extension_int, 23);  // Field 5.
+  message.AppendToString(&expected);
+  message.Clear();
+  message.set_my_string("foo");  // Field 11.
+  message.AppendToString(&expected);
+  message.Clear();
+  message.SetExtension(unittest::my_extension_string, "bar");  // Field 50.
+  message.AppendToString(&expected);
+  message.Clear();
+  message.set_my_float(1.0);  // Field 101.
+  message.AppendToString(&expected);
+  message.Clear();
+
+  // We don't EXPECT_EQ() since we don't want to print raw bytes to stdout.
+  EXPECT_TRUE(serialized == expected);
+}
+
+}  // namespace TestUtil
 }  // namespace protobuf
 
 }  // namespace google
diff --git a/src/google/protobuf/test_util.inc b/src/google/protobuf/test_util.inc
new file mode 100644
index 00000000..185f68d9
--- /dev/null
+++ b/src/google/protobuf/test_util.inc
@@ -0,0 +1,2600 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// This file needs to be included as .inc as it depends on the namespaces
+// (unittest and unittest_import) being set up properly. It is also included
+// within an enclosing namespace and requires header files to be included
+// out of this file.
+
+#include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/message.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+
+namespace google {
+namespace protobuf {
+namespace TestUtil {
+
+// Set every field in the message to a unique value.
+inline void SetAllFields(UNITTEST::TestAllTypes* message);
+inline void SetOptionalFields(UNITTEST::TestAllTypes* message);
+inline void AddRepeatedFields1(UNITTEST::TestAllTypes* message);
+inline void AddRepeatedFields2(UNITTEST::TestAllTypes* message);
+inline void SetDefaultFields(UNITTEST::TestAllTypes* message);
+inline void SetOneofFields(UNITTEST::TestAllTypes* message);
+inline void SetAllExtensions(UNITTEST::TestAllExtensions* message);
+inline void SetOneofFields(UNITTEST::TestAllExtensions* message);
+inline void SetAllFieldsAndExtensions(UNITTEST::TestFieldOrderings* message);
+inline void SetPackedFields(UNITTEST::TestPackedTypes* message);
+inline void SetPackedExtensions(UNITTEST::TestPackedExtensions* message);
+inline void SetUnpackedFields(UNITTEST::TestUnpackedTypes* message);
+inline void SetOneof1(UNITTEST::TestOneof2* message);
+inline void SetOneof2(UNITTEST::TestOneof2* message);
+
+// Use the repeated versions of the set_*() accessors to modify all the
+// repeated fields of the message (which should already have been
+// initialized with Set*Fields()).  Set*Fields() itself only tests
+// the add_*() accessors.
+inline void ModifyRepeatedFields(UNITTEST::TestAllTypes* message);
+inline void ModifyRepeatedExtensions(UNITTEST::TestAllExtensions* message);
+inline void ModifyPackedFields(UNITTEST::TestPackedTypes* message);
+inline void ModifyPackedExtensions(UNITTEST::TestPackedExtensions* message);
+
+// Check that all fields have the values that they should have after
+// Set*Fields() is called.
+inline void ExpectAllFieldsSet(const UNITTEST::TestAllTypes& message);
+inline void ExpectAllExtensionsSet(const UNITTEST::TestAllExtensions& message);
+inline void ExpectPackedFieldsSet(const UNITTEST::TestPackedTypes& message);
+inline void ExpectPackedExtensionsSet(
+    const UNITTEST::TestPackedExtensions& message);
+inline void ExpectUnpackedFieldsSet(const UNITTEST::TestUnpackedTypes& message);
+inline void ExpectUnpackedExtensionsSet(
+    const UNITTEST::TestUnpackedExtensions& message);
+inline void ExpectOneofSet1(const UNITTEST::TestOneof2& message);
+inline void ExpectOneofSet2(const UNITTEST::TestOneof2& message);
+
+// Expect that the message is modified as would be expected from
+// Modify*Fields().
+inline void ExpectRepeatedFieldsModified(const UNITTEST::TestAllTypes& message);
+inline void ExpectRepeatedExtensionsModified(
+    const UNITTEST::TestAllExtensions& message);
+inline void ExpectPackedFieldsModified(
+    const UNITTEST::TestPackedTypes& message);
+inline void ExpectPackedExtensionsModified(
+    const UNITTEST::TestPackedExtensions& message);
+
+// Check that all fields have their default values.
+inline void ExpectClear(const UNITTEST::TestAllTypes& message);
+inline void ExpectExtensionsClear(const UNITTEST::TestAllExtensions& message);
+inline void ExpectPackedClear(const UNITTEST::TestPackedTypes& message);
+inline void ExpectPackedExtensionsClear(
+    const UNITTEST::TestPackedExtensions& message);
+inline void ExpectOneofClear(const UNITTEST::TestOneof2& message);
+
+// Check that all repeated fields have had their last elements removed.
+inline void ExpectLastRepeatedsRemoved(const UNITTEST::TestAllTypes& message);
+inline void ExpectLastRepeatedExtensionsRemoved(
+    const UNITTEST::TestAllExtensions& message);
+inline void ExpectLastRepeatedsReleased(const UNITTEST::TestAllTypes& message);
+inline void ExpectLastRepeatedExtensionsReleased(
+    const UNITTEST::TestAllExtensions& message);
+
+// Check that all repeated fields have had their first and last elements
+// swapped.
+inline void ExpectRepeatedsSwapped(const UNITTEST::TestAllTypes& message);
+inline void ExpectRepeatedExtensionsSwapped(
+    const UNITTEST::TestAllExtensions& message);
+
+inline void ExpectAtMostOneFieldSetInOneof(const UNITTEST::TestOneof2& message);
+
+}  // namespace TestUtil
+
+inline void TestUtil::SetAllFields(UNITTEST::TestAllTypes* message) {
+  SetOptionalFields(message);
+  AddRepeatedFields1(message);
+  AddRepeatedFields2(message);
+  SetDefaultFields(message);
+  SetOneofFields(message);
+}
+
+inline void TestUtil::SetOptionalFields(UNITTEST::TestAllTypes* message) {
+  message->set_optional_int32(101);
+  message->set_optional_int64(102);
+  message->set_optional_uint32(103);
+  message->set_optional_uint64(104);
+  message->set_optional_sint32(105);
+  message->set_optional_sint64(106);
+  message->set_optional_fixed32(107);
+  message->set_optional_fixed64(108);
+  message->set_optional_sfixed32(109);
+  message->set_optional_sfixed64(110);
+  message->set_optional_float(111);
+  message->set_optional_double(112);
+  message->set_optional_bool(true);
+  message->set_optional_string("115");
+  message->set_optional_bytes("116");
+
+  message->mutable_optionalgroup()->set_a(117);
+  message->mutable_optional_nested_message()->set_bb(118);
+  message->mutable_optional_foreign_message()->set_c(119);
+  message->mutable_optional_import_message()->set_d(120);
+  message->mutable_optional_public_import_message()->set_e(126);
+  message->mutable_optional_lazy_message()->set_bb(127);
+
+  message->set_optional_nested_enum(UNITTEST::TestAllTypes::BAZ);
+  message->set_optional_foreign_enum(UNITTEST::FOREIGN_BAZ);
+  message->set_optional_import_enum(UNITTEST_IMPORT::IMPORT_BAZ);
+
+  // StringPiece and Cord fields are only accessible via reflection in the
+  // open source release; see comments in compiler/cpp/string_field.cc.
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  message->GetReflection()->SetString(
+      message,
+      message->GetDescriptor()->FindFieldByName("optional_string_piece"),
+      "124");
+  message->GetReflection()->SetString(
+      message, message->GetDescriptor()->FindFieldByName("optional_cord"),
+      "125");
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::AddRepeatedFields1(UNITTEST::TestAllTypes* message) {
+  message->add_repeated_int32(201);
+  message->add_repeated_int64(202);
+  message->add_repeated_uint32(203);
+  message->add_repeated_uint64(204);
+  message->add_repeated_sint32(205);
+  message->add_repeated_sint64(206);
+  message->add_repeated_fixed32(207);
+  message->add_repeated_fixed64(208);
+  message->add_repeated_sfixed32(209);
+  message->add_repeated_sfixed64(210);
+  message->add_repeated_float(211);
+  message->add_repeated_double(212);
+  message->add_repeated_bool(true);
+  message->add_repeated_string("215");
+  message->add_repeated_bytes("216");
+
+  message->add_repeatedgroup()->set_a(217);
+  message->add_repeated_nested_message()->set_bb(218);
+  message->add_repeated_foreign_message()->set_c(219);
+  message->add_repeated_import_message()->set_d(220);
+  message->add_repeated_lazy_message()->set_bb(227);
+
+  message->add_repeated_nested_enum(UNITTEST::TestAllTypes::BAR);
+  message->add_repeated_foreign_enum(UNITTEST::FOREIGN_BAR);
+  message->add_repeated_import_enum(UNITTEST_IMPORT::IMPORT_BAR);
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  message->GetReflection()->AddString(
+      message,
+      message->GetDescriptor()->FindFieldByName("repeated_string_piece"),
+      "224");
+  message->GetReflection()->AddString(
+      message, message->GetDescriptor()->FindFieldByName("repeated_cord"),
+      "225");
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
+
+inline void TestUtil::AddRepeatedFields2(UNITTEST::TestAllTypes* message) {
+  // Add a second one of each field.
+  message->add_repeated_int32(301);
+  message->add_repeated_int64(302);
+  message->add_repeated_uint32(303);
+  message->add_repeated_uint64(304);
+  message->add_repeated_sint32(305);
+  message->add_repeated_sint64(306);
+  message->add_repeated_fixed32(307);
+  message->add_repeated_fixed64(308);
+  message->add_repeated_sfixed32(309);
+  message->add_repeated_sfixed64(310);
+  message->add_repeated_float(311);
+  message->add_repeated_double(312);
+  message->add_repeated_bool(false);
+  message->add_repeated_string("315");
+  message->add_repeated_bytes("316");
+
+  message->add_repeatedgroup()->set_a(317);
+  message->add_repeated_nested_message()->set_bb(318);
+  message->add_repeated_foreign_message()->set_c(319);
+  message->add_repeated_import_message()->set_d(320);
+  message->add_repeated_lazy_message()->set_bb(327);
+
+  message->add_repeated_nested_enum(UNITTEST::TestAllTypes::BAZ);
+  message->add_repeated_foreign_enum(UNITTEST::FOREIGN_BAZ);
+  message->add_repeated_import_enum(UNITTEST_IMPORT::IMPORT_BAZ);
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  message->GetReflection()->AddString(
+      message,
+      message->GetDescriptor()->FindFieldByName("repeated_string_piece"),
+      "324");
+  message->GetReflection()->AddString(
+      message, message->GetDescriptor()->FindFieldByName("repeated_cord"),
+      "325");
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::SetDefaultFields(UNITTEST::TestAllTypes* message) {
+  message->set_default_int32(401);
+  message->set_default_int64(402);
+  message->set_default_uint32(403);
+  message->set_default_uint64(404);
+  message->set_default_sint32(405);
+  message->set_default_sint64(406);
+  message->set_default_fixed32(407);
+  message->set_default_fixed64(408);
+  message->set_default_sfixed32(409);
+  message->set_default_sfixed64(410);
+  message->set_default_float(411);
+  message->set_default_double(412);
+  message->set_default_bool(false);
+  message->set_default_string("415");
+  message->set_default_bytes("416");
+
+  message->set_default_nested_enum(UNITTEST::TestAllTypes::FOO);
+  message->set_default_foreign_enum(UNITTEST::FOREIGN_FOO);
+  message->set_default_import_enum(UNITTEST_IMPORT::IMPORT_FOO);
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  message->GetReflection()->SetString(
+      message,
+      message->GetDescriptor()->FindFieldByName("default_string_piece"), "424");
+  message->GetReflection()->SetString(
+      message, message->GetDescriptor()->FindFieldByName("default_cord"),
+      "425");
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ModifyRepeatedFields(UNITTEST::TestAllTypes* message) {
+  message->set_repeated_int32(1, 501);
+  message->set_repeated_int64(1, 502);
+  message->set_repeated_uint32(1, 503);
+  message->set_repeated_uint64(1, 504);
+  message->set_repeated_sint32(1, 505);
+  message->set_repeated_sint64(1, 506);
+  message->set_repeated_fixed32(1, 507);
+  message->set_repeated_fixed64(1, 508);
+  message->set_repeated_sfixed32(1, 509);
+  message->set_repeated_sfixed64(1, 510);
+  message->set_repeated_float(1, 511);
+  message->set_repeated_double(1, 512);
+  message->set_repeated_bool(1, true);
+  message->set_repeated_string(1, "515");
+  message->set_repeated_bytes(1, "516");
+
+  message->mutable_repeatedgroup(1)->set_a(517);
+  message->mutable_repeated_nested_message(1)->set_bb(518);
+  message->mutable_repeated_foreign_message(1)->set_c(519);
+  message->mutable_repeated_import_message(1)->set_d(520);
+  message->mutable_repeated_lazy_message(1)->set_bb(527);
+
+  message->set_repeated_nested_enum(1, UNITTEST::TestAllTypes::FOO);
+  message->set_repeated_foreign_enum(1, UNITTEST::FOREIGN_FOO);
+  message->set_repeated_import_enum(1, UNITTEST_IMPORT::IMPORT_FOO);
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  message->GetReflection()->SetRepeatedString(
+      message,
+      message->GetDescriptor()->FindFieldByName("repeated_string_piece"), 1,
+      "524");
+  message->GetReflection()->SetRepeatedString(
+      message, message->GetDescriptor()->FindFieldByName("repeated_cord"), 1,
+      "525");
+#endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
+
+// ------------------------------------------------------------------
+inline void TestUtil::SetOneofFields(UNITTEST::TestAllTypes* message) {
+  message->set_oneof_uint32(601);
+  message->mutable_oneof_nested_message()->set_bb(602);
+  message->set_oneof_string("603");
+  message->set_oneof_bytes("604");
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectAllFieldsSet(
+    const UNITTEST::TestAllTypes& message) {
+  EXPECT_TRUE(message.has_optional_int32());
+  EXPECT_TRUE(message.has_optional_int64());
+  EXPECT_TRUE(message.has_optional_uint32());
+  EXPECT_TRUE(message.has_optional_uint64());
+  EXPECT_TRUE(message.has_optional_sint32());
+  EXPECT_TRUE(message.has_optional_sint64());
+  EXPECT_TRUE(message.has_optional_fixed32());
+  EXPECT_TRUE(message.has_optional_fixed64());
+  EXPECT_TRUE(message.has_optional_sfixed32());
+  EXPECT_TRUE(message.has_optional_sfixed64());
+  EXPECT_TRUE(message.has_optional_float());
+  EXPECT_TRUE(message.has_optional_double());
+  EXPECT_TRUE(message.has_optional_bool());
+  EXPECT_TRUE(message.has_optional_string());
+  EXPECT_TRUE(message.has_optional_bytes());
+
+  EXPECT_TRUE(message.has_optionalgroup());
+  EXPECT_TRUE(message.has_optional_nested_message());
+  EXPECT_TRUE(message.has_optional_foreign_message());
+  EXPECT_TRUE(message.has_optional_import_message());
+  EXPECT_TRUE(message.has_optional_public_import_message());
+  EXPECT_TRUE(message.has_optional_lazy_message());
+
+  EXPECT_TRUE(message.optionalgroup().has_a());
+  EXPECT_TRUE(message.optional_nested_message().has_bb());
+  EXPECT_TRUE(message.optional_foreign_message().has_c());
+  EXPECT_TRUE(message.optional_import_message().has_d());
+  EXPECT_TRUE(message.optional_public_import_message().has_e());
+  EXPECT_TRUE(message.optional_lazy_message().has_bb());
+
+  EXPECT_TRUE(message.has_optional_nested_enum());
+  EXPECT_TRUE(message.has_optional_foreign_enum());
+  EXPECT_TRUE(message.has_optional_import_enum());
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  EXPECT_TRUE(message.has_optional_string_piece());
+  EXPECT_TRUE(message.has_optional_cord());
+#endif
+
+  EXPECT_EQ(101, message.optional_int32());
+  EXPECT_EQ(102, message.optional_int64());
+  EXPECT_EQ(103, message.optional_uint32());
+  EXPECT_EQ(104, message.optional_uint64());
+  EXPECT_EQ(105, message.optional_sint32());
+  EXPECT_EQ(106, message.optional_sint64());
+  EXPECT_EQ(107, message.optional_fixed32());
+  EXPECT_EQ(108, message.optional_fixed64());
+  EXPECT_EQ(109, message.optional_sfixed32());
+  EXPECT_EQ(110, message.optional_sfixed64());
+  EXPECT_EQ(111, message.optional_float());
+  EXPECT_EQ(112, message.optional_double());
+  EXPECT_TRUE(message.optional_bool());
+  EXPECT_EQ("115", message.optional_string());
+  EXPECT_EQ("116", message.optional_bytes());
+
+  EXPECT_EQ(117, message.optionalgroup().a());
+  EXPECT_EQ(118, message.optional_nested_message().bb());
+  EXPECT_EQ(119, message.optional_foreign_message().c());
+  EXPECT_EQ(120, message.optional_import_message().d());
+  EXPECT_EQ(126, message.optional_public_import_message().e());
+  EXPECT_EQ(127, message.optional_lazy_message().bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ, message.optional_nested_enum());
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, message.optional_foreign_enum());
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ, message.optional_import_enum());
+
+
+  // -----------------------------------------------------------------
+
+  ASSERT_EQ(2, message.repeated_int32_size());
+  ASSERT_EQ(2, message.repeated_int64_size());
+  ASSERT_EQ(2, message.repeated_uint32_size());
+  ASSERT_EQ(2, message.repeated_uint64_size());
+  ASSERT_EQ(2, message.repeated_sint32_size());
+  ASSERT_EQ(2, message.repeated_sint64_size());
+  ASSERT_EQ(2, message.repeated_fixed32_size());
+  ASSERT_EQ(2, message.repeated_fixed64_size());
+  ASSERT_EQ(2, message.repeated_sfixed32_size());
+  ASSERT_EQ(2, message.repeated_sfixed64_size());
+  ASSERT_EQ(2, message.repeated_float_size());
+  ASSERT_EQ(2, message.repeated_double_size());
+  ASSERT_EQ(2, message.repeated_bool_size());
+  ASSERT_EQ(2, message.repeated_string_size());
+  ASSERT_EQ(2, message.repeated_bytes_size());
+
+  ASSERT_EQ(2, message.repeatedgroup_size());
+  ASSERT_EQ(2, message.repeated_nested_message_size());
+  ASSERT_EQ(2, message.repeated_foreign_message_size());
+  ASSERT_EQ(2, message.repeated_import_message_size());
+  ASSERT_EQ(2, message.repeated_lazy_message_size());
+  ASSERT_EQ(2, message.repeated_nested_enum_size());
+  ASSERT_EQ(2, message.repeated_foreign_enum_size());
+  ASSERT_EQ(2, message.repeated_import_enum_size());
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  ASSERT_EQ(2, message.repeated_string_piece_size());
+  ASSERT_EQ(2, message.repeated_cord_size());
+#endif
+
+  EXPECT_EQ(201, message.repeated_int32(0));
+  EXPECT_EQ(202, message.repeated_int64(0));
+  EXPECT_EQ(203, message.repeated_uint32(0));
+  EXPECT_EQ(204, message.repeated_uint64(0));
+  EXPECT_EQ(205, message.repeated_sint32(0));
+  EXPECT_EQ(206, message.repeated_sint64(0));
+  EXPECT_EQ(207, message.repeated_fixed32(0));
+  EXPECT_EQ(208, message.repeated_fixed64(0));
+  EXPECT_EQ(209, message.repeated_sfixed32(0));
+  EXPECT_EQ(210, message.repeated_sfixed64(0));
+  EXPECT_EQ(211, message.repeated_float(0));
+  EXPECT_EQ(212, message.repeated_double(0));
+  EXPECT_TRUE(message.repeated_bool(0));
+  EXPECT_EQ("215", message.repeated_string(0));
+  EXPECT_EQ("216", message.repeated_bytes(0));
+
+  EXPECT_EQ(217, message.repeatedgroup(0).a());
+  EXPECT_EQ(218, message.repeated_nested_message(0).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+  EXPECT_EQ(227, message.repeated_lazy_message(0).bb());
+
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message.repeated_nested_enum(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.repeated_foreign_enum(0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR, message.repeated_import_enum(0));
+
+  EXPECT_EQ(301, message.repeated_int32(1));
+  EXPECT_EQ(302, message.repeated_int64(1));
+  EXPECT_EQ(303, message.repeated_uint32(1));
+  EXPECT_EQ(304, message.repeated_uint64(1));
+  EXPECT_EQ(305, message.repeated_sint32(1));
+  EXPECT_EQ(306, message.repeated_sint64(1));
+  EXPECT_EQ(307, message.repeated_fixed32(1));
+  EXPECT_EQ(308, message.repeated_fixed64(1));
+  EXPECT_EQ(309, message.repeated_sfixed32(1));
+  EXPECT_EQ(310, message.repeated_sfixed64(1));
+  EXPECT_EQ(311, message.repeated_float(1));
+  EXPECT_EQ(312, message.repeated_double(1));
+  EXPECT_FALSE(message.repeated_bool(1));
+  EXPECT_EQ("315", message.repeated_string(1));
+  EXPECT_EQ("316", message.repeated_bytes(1));
+
+  EXPECT_EQ(317, message.repeatedgroup(1).a());
+  EXPECT_EQ(318, message.repeated_nested_message(1).bb());
+  EXPECT_EQ(319, message.repeated_foreign_message(1).c());
+  EXPECT_EQ(320, message.repeated_import_message(1).d());
+  EXPECT_EQ(327, message.repeated_lazy_message(1).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ, message.repeated_nested_enum(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, message.repeated_foreign_enum(1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ, message.repeated_import_enum(1));
+
+
+  // -----------------------------------------------------------------
+
+  EXPECT_TRUE(message.has_default_int32());
+  EXPECT_TRUE(message.has_default_int64());
+  EXPECT_TRUE(message.has_default_uint32());
+  EXPECT_TRUE(message.has_default_uint64());
+  EXPECT_TRUE(message.has_default_sint32());
+  EXPECT_TRUE(message.has_default_sint64());
+  EXPECT_TRUE(message.has_default_fixed32());
+  EXPECT_TRUE(message.has_default_fixed64());
+  EXPECT_TRUE(message.has_default_sfixed32());
+  EXPECT_TRUE(message.has_default_sfixed64());
+  EXPECT_TRUE(message.has_default_float());
+  EXPECT_TRUE(message.has_default_double());
+  EXPECT_TRUE(message.has_default_bool());
+  EXPECT_TRUE(message.has_default_string());
+  EXPECT_TRUE(message.has_default_bytes());
+
+  EXPECT_TRUE(message.has_default_nested_enum());
+  EXPECT_TRUE(message.has_default_foreign_enum());
+  EXPECT_TRUE(message.has_default_import_enum());
+
+
+  EXPECT_EQ(401, message.default_int32());
+  EXPECT_EQ(402, message.default_int64());
+  EXPECT_EQ(403, message.default_uint32());
+  EXPECT_EQ(404, message.default_uint64());
+  EXPECT_EQ(405, message.default_sint32());
+  EXPECT_EQ(406, message.default_sint64());
+  EXPECT_EQ(407, message.default_fixed32());
+  EXPECT_EQ(408, message.default_fixed64());
+  EXPECT_EQ(409, message.default_sfixed32());
+  EXPECT_EQ(410, message.default_sfixed64());
+  EXPECT_EQ(411, message.default_float());
+  EXPECT_EQ(412, message.default_double());
+  EXPECT_FALSE(message.default_bool());
+  EXPECT_EQ("415", message.default_string());
+  EXPECT_EQ("416", message.default_bytes());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO, message.default_nested_enum());
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, message.default_foreign_enum());
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO, message.default_import_enum());
+
+
+  EXPECT_FALSE(message.has_oneof_uint32());
+  EXPECT_FALSE(message.has_oneof_nested_message());
+  EXPECT_FALSE(message.has_oneof_string());
+  EXPECT_TRUE(message.has_oneof_bytes());
+
+  EXPECT_EQ("604", message.oneof_bytes());
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectClear(const UNITTEST::TestAllTypes& message) {
+  // has_blah() should initially be false for all optional fields.
+  EXPECT_FALSE(message.has_optional_int32());
+  EXPECT_FALSE(message.has_optional_int64());
+  EXPECT_FALSE(message.has_optional_uint32());
+  EXPECT_FALSE(message.has_optional_uint64());
+  EXPECT_FALSE(message.has_optional_sint32());
+  EXPECT_FALSE(message.has_optional_sint64());
+  EXPECT_FALSE(message.has_optional_fixed32());
+  EXPECT_FALSE(message.has_optional_fixed64());
+  EXPECT_FALSE(message.has_optional_sfixed32());
+  EXPECT_FALSE(message.has_optional_sfixed64());
+  EXPECT_FALSE(message.has_optional_float());
+  EXPECT_FALSE(message.has_optional_double());
+  EXPECT_FALSE(message.has_optional_bool());
+  EXPECT_FALSE(message.has_optional_string());
+  EXPECT_FALSE(message.has_optional_bytes());
+
+  EXPECT_FALSE(message.has_optionalgroup());
+  EXPECT_FALSE(message.has_optional_nested_message());
+  EXPECT_FALSE(message.has_optional_foreign_message());
+  EXPECT_FALSE(message.has_optional_import_message());
+  EXPECT_FALSE(message.has_optional_public_import_message());
+  EXPECT_FALSE(message.has_optional_lazy_message());
+
+  EXPECT_FALSE(message.has_optional_nested_enum());
+  EXPECT_FALSE(message.has_optional_foreign_enum());
+  EXPECT_FALSE(message.has_optional_import_enum());
+
+  EXPECT_FALSE(message.has_optional_string_piece());
+  EXPECT_FALSE(message.has_optional_cord());
+
+  // Optional fields without defaults are set to zero or something like it.
+  EXPECT_EQ(0, message.optional_int32());
+  EXPECT_EQ(0, message.optional_int64());
+  EXPECT_EQ(0, message.optional_uint32());
+  EXPECT_EQ(0, message.optional_uint64());
+  EXPECT_EQ(0, message.optional_sint32());
+  EXPECT_EQ(0, message.optional_sint64());
+  EXPECT_EQ(0, message.optional_fixed32());
+  EXPECT_EQ(0, message.optional_fixed64());
+  EXPECT_EQ(0, message.optional_sfixed32());
+  EXPECT_EQ(0, message.optional_sfixed64());
+  EXPECT_EQ(0, message.optional_float());
+  EXPECT_EQ(0, message.optional_double());
+  EXPECT_FALSE(message.optional_bool());
+  EXPECT_EQ("", message.optional_string());
+  EXPECT_EQ("", message.optional_bytes());
+
+  // Embedded messages should also be clear.
+  EXPECT_FALSE(message.optionalgroup().has_a());
+  EXPECT_FALSE(message.optional_nested_message().has_bb());
+  EXPECT_FALSE(message.optional_foreign_message().has_c());
+  EXPECT_FALSE(message.optional_import_message().has_d());
+  EXPECT_FALSE(message.optional_public_import_message().has_e());
+  EXPECT_FALSE(message.optional_lazy_message().has_bb());
+
+  EXPECT_EQ(0, message.optionalgroup().a());
+  EXPECT_EQ(0, message.optional_nested_message().bb());
+  EXPECT_EQ(0, message.optional_foreign_message().c());
+  EXPECT_EQ(0, message.optional_import_message().d());
+  EXPECT_EQ(0, message.optional_public_import_message().e());
+  EXPECT_EQ(0, message.optional_lazy_message().bb());
+
+  // Enums without defaults are set to the first value in the enum.
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO, message.optional_nested_enum());
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, message.optional_foreign_enum());
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO, message.optional_import_enum());
+
+
+  // Repeated fields are empty.
+  EXPECT_EQ(0, message.repeated_int32_size());
+  EXPECT_EQ(0, message.repeated_int64_size());
+  EXPECT_EQ(0, message.repeated_uint32_size());
+  EXPECT_EQ(0, message.repeated_uint64_size());
+  EXPECT_EQ(0, message.repeated_sint32_size());
+  EXPECT_EQ(0, message.repeated_sint64_size());
+  EXPECT_EQ(0, message.repeated_fixed32_size());
+  EXPECT_EQ(0, message.repeated_fixed64_size());
+  EXPECT_EQ(0, message.repeated_sfixed32_size());
+  EXPECT_EQ(0, message.repeated_sfixed64_size());
+  EXPECT_EQ(0, message.repeated_float_size());
+  EXPECT_EQ(0, message.repeated_double_size());
+  EXPECT_EQ(0, message.repeated_bool_size());
+  EXPECT_EQ(0, message.repeated_string_size());
+  EXPECT_EQ(0, message.repeated_bytes_size());
+
+  EXPECT_EQ(0, message.repeatedgroup_size());
+  EXPECT_EQ(0, message.repeated_nested_message_size());
+  EXPECT_EQ(0, message.repeated_foreign_message_size());
+  EXPECT_EQ(0, message.repeated_import_message_size());
+  EXPECT_EQ(0, message.repeated_lazy_message_size());
+  EXPECT_EQ(0, message.repeated_nested_enum_size());
+  EXPECT_EQ(0, message.repeated_foreign_enum_size());
+  EXPECT_EQ(0, message.repeated_import_enum_size());
+
+  EXPECT_EQ(0, message.repeated_string_piece_size());
+  EXPECT_EQ(0, message.repeated_cord_size());
+
+  // has_blah() should also be false for all default fields.
+  EXPECT_FALSE(message.has_default_int32());
+  EXPECT_FALSE(message.has_default_int64());
+  EXPECT_FALSE(message.has_default_uint32());
+  EXPECT_FALSE(message.has_default_uint64());
+  EXPECT_FALSE(message.has_default_sint32());
+  EXPECT_FALSE(message.has_default_sint64());
+  EXPECT_FALSE(message.has_default_fixed32());
+  EXPECT_FALSE(message.has_default_fixed64());
+  EXPECT_FALSE(message.has_default_sfixed32());
+  EXPECT_FALSE(message.has_default_sfixed64());
+  EXPECT_FALSE(message.has_default_float());
+  EXPECT_FALSE(message.has_default_double());
+  EXPECT_FALSE(message.has_default_bool());
+  EXPECT_FALSE(message.has_default_string());
+  EXPECT_FALSE(message.has_default_bytes());
+
+  EXPECT_FALSE(message.has_default_nested_enum());
+  EXPECT_FALSE(message.has_default_foreign_enum());
+  EXPECT_FALSE(message.has_default_import_enum());
+
+
+  // Fields with defaults have their default values (duh).
+  EXPECT_EQ(41, message.default_int32());
+  EXPECT_EQ(42, message.default_int64());
+  EXPECT_EQ(43, message.default_uint32());
+  EXPECT_EQ(44, message.default_uint64());
+  EXPECT_EQ(-45, message.default_sint32());
+  EXPECT_EQ(46, message.default_sint64());
+  EXPECT_EQ(47, message.default_fixed32());
+  EXPECT_EQ(48, message.default_fixed64());
+  EXPECT_EQ(49, message.default_sfixed32());
+  EXPECT_EQ(-50, message.default_sfixed64());
+  EXPECT_EQ(51.5, message.default_float());
+  EXPECT_EQ(52e3, message.default_double());
+  EXPECT_TRUE(message.default_bool());
+  EXPECT_EQ("hello", message.default_string());
+  EXPECT_EQ("world", message.default_bytes());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message.default_nested_enum());
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.default_foreign_enum());
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR, message.default_import_enum());
+
+
+  EXPECT_FALSE(message.has_oneof_uint32());
+  EXPECT_FALSE(message.has_oneof_nested_message());
+  EXPECT_FALSE(message.has_oneof_string());
+  EXPECT_FALSE(message.has_oneof_bytes());
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectRepeatedFieldsModified(
+    const UNITTEST::TestAllTypes& message) {
+  // ModifyRepeatedFields only sets the second repeated element of each
+  // field.  In addition to verifying this, we also verify that the first
+  // element and size were *not* modified.
+  ASSERT_EQ(2, message.repeated_int32_size());
+  ASSERT_EQ(2, message.repeated_int64_size());
+  ASSERT_EQ(2, message.repeated_uint32_size());
+  ASSERT_EQ(2, message.repeated_uint64_size());
+  ASSERT_EQ(2, message.repeated_sint32_size());
+  ASSERT_EQ(2, message.repeated_sint64_size());
+  ASSERT_EQ(2, message.repeated_fixed32_size());
+  ASSERT_EQ(2, message.repeated_fixed64_size());
+  ASSERT_EQ(2, message.repeated_sfixed32_size());
+  ASSERT_EQ(2, message.repeated_sfixed64_size());
+  ASSERT_EQ(2, message.repeated_float_size());
+  ASSERT_EQ(2, message.repeated_double_size());
+  ASSERT_EQ(2, message.repeated_bool_size());
+  ASSERT_EQ(2, message.repeated_string_size());
+  ASSERT_EQ(2, message.repeated_bytes_size());
+
+  ASSERT_EQ(2, message.repeatedgroup_size());
+  ASSERT_EQ(2, message.repeated_nested_message_size());
+  ASSERT_EQ(2, message.repeated_foreign_message_size());
+  ASSERT_EQ(2, message.repeated_import_message_size());
+  ASSERT_EQ(2, message.repeated_lazy_message_size());
+  ASSERT_EQ(2, message.repeated_nested_enum_size());
+  ASSERT_EQ(2, message.repeated_foreign_enum_size());
+  ASSERT_EQ(2, message.repeated_import_enum_size());
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  ASSERT_EQ(2, message.repeated_string_piece_size());
+  ASSERT_EQ(2, message.repeated_cord_size());
+#endif
+
+  EXPECT_EQ(201, message.repeated_int32(0));
+  EXPECT_EQ(202, message.repeated_int64(0));
+  EXPECT_EQ(203, message.repeated_uint32(0));
+  EXPECT_EQ(204, message.repeated_uint64(0));
+  EXPECT_EQ(205, message.repeated_sint32(0));
+  EXPECT_EQ(206, message.repeated_sint64(0));
+  EXPECT_EQ(207, message.repeated_fixed32(0));
+  EXPECT_EQ(208, message.repeated_fixed64(0));
+  EXPECT_EQ(209, message.repeated_sfixed32(0));
+  EXPECT_EQ(210, message.repeated_sfixed64(0));
+  EXPECT_EQ(211, message.repeated_float(0));
+  EXPECT_EQ(212, message.repeated_double(0));
+  EXPECT_TRUE(message.repeated_bool(0));
+  EXPECT_EQ("215", message.repeated_string(0));
+  EXPECT_EQ("216", message.repeated_bytes(0));
+
+  EXPECT_EQ(217, message.repeatedgroup(0).a());
+  EXPECT_EQ(218, message.repeated_nested_message(0).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+  EXPECT_EQ(227, message.repeated_lazy_message(0).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message.repeated_nested_enum(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.repeated_foreign_enum(0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR, message.repeated_import_enum(0));
+
+
+  // Actually verify the second (modified) elements now.
+  EXPECT_EQ(501, message.repeated_int32(1));
+  EXPECT_EQ(502, message.repeated_int64(1));
+  EXPECT_EQ(503, message.repeated_uint32(1));
+  EXPECT_EQ(504, message.repeated_uint64(1));
+  EXPECT_EQ(505, message.repeated_sint32(1));
+  EXPECT_EQ(506, message.repeated_sint64(1));
+  EXPECT_EQ(507, message.repeated_fixed32(1));
+  EXPECT_EQ(508, message.repeated_fixed64(1));
+  EXPECT_EQ(509, message.repeated_sfixed32(1));
+  EXPECT_EQ(510, message.repeated_sfixed64(1));
+  EXPECT_EQ(511, message.repeated_float(1));
+  EXPECT_EQ(512, message.repeated_double(1));
+  EXPECT_TRUE(message.repeated_bool(1));
+  EXPECT_EQ("515", message.repeated_string(1));
+  EXPECT_EQ("516", message.repeated_bytes(1));
+
+  EXPECT_EQ(517, message.repeatedgroup(1).a());
+  EXPECT_EQ(518, message.repeated_nested_message(1).bb());
+  EXPECT_EQ(519, message.repeated_foreign_message(1).c());
+  EXPECT_EQ(520, message.repeated_import_message(1).d());
+  EXPECT_EQ(527, message.repeated_lazy_message(1).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO, message.repeated_nested_enum(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, message.repeated_foreign_enum(1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO, message.repeated_import_enum(1));
+
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::SetPackedFields(UNITTEST::TestPackedTypes* message) {
+  message->add_packed_int32(601);
+  message->add_packed_int64(602);
+  message->add_packed_uint32(603);
+  message->add_packed_uint64(604);
+  message->add_packed_sint32(605);
+  message->add_packed_sint64(606);
+  message->add_packed_fixed32(607);
+  message->add_packed_fixed64(608);
+  message->add_packed_sfixed32(609);
+  message->add_packed_sfixed64(610);
+  message->add_packed_float(611);
+  message->add_packed_double(612);
+  message->add_packed_bool(true);
+  message->add_packed_enum(UNITTEST::FOREIGN_BAR);
+  // add a second one of each field
+  message->add_packed_int32(701);
+  message->add_packed_int64(702);
+  message->add_packed_uint32(703);
+  message->add_packed_uint64(704);
+  message->add_packed_sint32(705);
+  message->add_packed_sint64(706);
+  message->add_packed_fixed32(707);
+  message->add_packed_fixed64(708);
+  message->add_packed_sfixed32(709);
+  message->add_packed_sfixed64(710);
+  message->add_packed_float(711);
+  message->add_packed_double(712);
+  message->add_packed_bool(false);
+  message->add_packed_enum(UNITTEST::FOREIGN_BAZ);
+}
+
+inline void TestUtil::SetUnpackedFields(UNITTEST::TestUnpackedTypes* message) {
+  // The values applied here must match those of SetPackedFields.
+
+  message->add_unpacked_int32(601);
+  message->add_unpacked_int64(602);
+  message->add_unpacked_uint32(603);
+  message->add_unpacked_uint64(604);
+  message->add_unpacked_sint32(605);
+  message->add_unpacked_sint64(606);
+  message->add_unpacked_fixed32(607);
+  message->add_unpacked_fixed64(608);
+  message->add_unpacked_sfixed32(609);
+  message->add_unpacked_sfixed64(610);
+  message->add_unpacked_float(611);
+  message->add_unpacked_double(612);
+  message->add_unpacked_bool(true);
+  message->add_unpacked_enum(UNITTEST::FOREIGN_BAR);
+  // add a second one of each field
+  message->add_unpacked_int32(701);
+  message->add_unpacked_int64(702);
+  message->add_unpacked_uint32(703);
+  message->add_unpacked_uint64(704);
+  message->add_unpacked_sint32(705);
+  message->add_unpacked_sint64(706);
+  message->add_unpacked_fixed32(707);
+  message->add_unpacked_fixed64(708);
+  message->add_unpacked_sfixed32(709);
+  message->add_unpacked_sfixed64(710);
+  message->add_unpacked_float(711);
+  message->add_unpacked_double(712);
+  message->add_unpacked_bool(false);
+  message->add_unpacked_enum(UNITTEST::FOREIGN_BAZ);
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ModifyPackedFields(UNITTEST::TestPackedTypes* message) {
+  message->set_packed_int32(1, 801);
+  message->set_packed_int64(1, 802);
+  message->set_packed_uint32(1, 803);
+  message->set_packed_uint64(1, 804);
+  message->set_packed_sint32(1, 805);
+  message->set_packed_sint64(1, 806);
+  message->set_packed_fixed32(1, 807);
+  message->set_packed_fixed64(1, 808);
+  message->set_packed_sfixed32(1, 809);
+  message->set_packed_sfixed64(1, 810);
+  message->set_packed_float(1, 811);
+  message->set_packed_double(1, 812);
+  message->set_packed_bool(1, true);
+  message->set_packed_enum(1, UNITTEST::FOREIGN_FOO);
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedFieldsSet(
+    const UNITTEST::TestPackedTypes& message) {
+  ASSERT_EQ(2, message.packed_int32_size());
+  ASSERT_EQ(2, message.packed_int64_size());
+  ASSERT_EQ(2, message.packed_uint32_size());
+  ASSERT_EQ(2, message.packed_uint64_size());
+  ASSERT_EQ(2, message.packed_sint32_size());
+  ASSERT_EQ(2, message.packed_sint64_size());
+  ASSERT_EQ(2, message.packed_fixed32_size());
+  ASSERT_EQ(2, message.packed_fixed64_size());
+  ASSERT_EQ(2, message.packed_sfixed32_size());
+  ASSERT_EQ(2, message.packed_sfixed64_size());
+  ASSERT_EQ(2, message.packed_float_size());
+  ASSERT_EQ(2, message.packed_double_size());
+  ASSERT_EQ(2, message.packed_bool_size());
+  ASSERT_EQ(2, message.packed_enum_size());
+
+  EXPECT_EQ(601, message.packed_int32(0));
+  EXPECT_EQ(602, message.packed_int64(0));
+  EXPECT_EQ(603, message.packed_uint32(0));
+  EXPECT_EQ(604, message.packed_uint64(0));
+  EXPECT_EQ(605, message.packed_sint32(0));
+  EXPECT_EQ(606, message.packed_sint64(0));
+  EXPECT_EQ(607, message.packed_fixed32(0));
+  EXPECT_EQ(608, message.packed_fixed64(0));
+  EXPECT_EQ(609, message.packed_sfixed32(0));
+  EXPECT_EQ(610, message.packed_sfixed64(0));
+  EXPECT_EQ(611, message.packed_float(0));
+  EXPECT_EQ(612, message.packed_double(0));
+  EXPECT_TRUE(message.packed_bool(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.packed_enum(0));
+
+  EXPECT_EQ(701, message.packed_int32(1));
+  EXPECT_EQ(702, message.packed_int64(1));
+  EXPECT_EQ(703, message.packed_uint32(1));
+  EXPECT_EQ(704, message.packed_uint64(1));
+  EXPECT_EQ(705, message.packed_sint32(1));
+  EXPECT_EQ(706, message.packed_sint64(1));
+  EXPECT_EQ(707, message.packed_fixed32(1));
+  EXPECT_EQ(708, message.packed_fixed64(1));
+  EXPECT_EQ(709, message.packed_sfixed32(1));
+  EXPECT_EQ(710, message.packed_sfixed64(1));
+  EXPECT_EQ(711, message.packed_float(1));
+  EXPECT_EQ(712, message.packed_double(1));
+  EXPECT_FALSE(message.packed_bool(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, message.packed_enum(1));
+}
+
+inline void TestUtil::ExpectUnpackedFieldsSet(
+    const UNITTEST::TestUnpackedTypes& message) {
+  // The values expected here must match those of ExpectPackedFieldsSet.
+
+  ASSERT_EQ(2, message.unpacked_int32_size());
+  ASSERT_EQ(2, message.unpacked_int64_size());
+  ASSERT_EQ(2, message.unpacked_uint32_size());
+  ASSERT_EQ(2, message.unpacked_uint64_size());
+  ASSERT_EQ(2, message.unpacked_sint32_size());
+  ASSERT_EQ(2, message.unpacked_sint64_size());
+  ASSERT_EQ(2, message.unpacked_fixed32_size());
+  ASSERT_EQ(2, message.unpacked_fixed64_size());
+  ASSERT_EQ(2, message.unpacked_sfixed32_size());
+  ASSERT_EQ(2, message.unpacked_sfixed64_size());
+  ASSERT_EQ(2, message.unpacked_float_size());
+  ASSERT_EQ(2, message.unpacked_double_size());
+  ASSERT_EQ(2, message.unpacked_bool_size());
+  ASSERT_EQ(2, message.unpacked_enum_size());
+
+  EXPECT_EQ(601, message.unpacked_int32(0));
+  EXPECT_EQ(602, message.unpacked_int64(0));
+  EXPECT_EQ(603, message.unpacked_uint32(0));
+  EXPECT_EQ(604, message.unpacked_uint64(0));
+  EXPECT_EQ(605, message.unpacked_sint32(0));
+  EXPECT_EQ(606, message.unpacked_sint64(0));
+  EXPECT_EQ(607, message.unpacked_fixed32(0));
+  EXPECT_EQ(608, message.unpacked_fixed64(0));
+  EXPECT_EQ(609, message.unpacked_sfixed32(0));
+  EXPECT_EQ(610, message.unpacked_sfixed64(0));
+  EXPECT_EQ(611, message.unpacked_float(0));
+  EXPECT_EQ(612, message.unpacked_double(0));
+  EXPECT_TRUE(message.unpacked_bool(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.unpacked_enum(0));
+
+  EXPECT_EQ(701, message.unpacked_int32(1));
+  EXPECT_EQ(702, message.unpacked_int64(1));
+  EXPECT_EQ(703, message.unpacked_uint32(1));
+  EXPECT_EQ(704, message.unpacked_uint64(1));
+  EXPECT_EQ(705, message.unpacked_sint32(1));
+  EXPECT_EQ(706, message.unpacked_sint64(1));
+  EXPECT_EQ(707, message.unpacked_fixed32(1));
+  EXPECT_EQ(708, message.unpacked_fixed64(1));
+  EXPECT_EQ(709, message.unpacked_sfixed32(1));
+  EXPECT_EQ(710, message.unpacked_sfixed64(1));
+  EXPECT_EQ(711, message.unpacked_float(1));
+  EXPECT_EQ(712, message.unpacked_double(1));
+  EXPECT_FALSE(message.unpacked_bool(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, message.unpacked_enum(1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedClear(
+    const UNITTEST::TestPackedTypes& message) {
+  // Packed repeated fields are empty.
+  EXPECT_EQ(0, message.packed_int32_size());
+  EXPECT_EQ(0, message.packed_int64_size());
+  EXPECT_EQ(0, message.packed_uint32_size());
+  EXPECT_EQ(0, message.packed_uint64_size());
+  EXPECT_EQ(0, message.packed_sint32_size());
+  EXPECT_EQ(0, message.packed_sint64_size());
+  EXPECT_EQ(0, message.packed_fixed32_size());
+  EXPECT_EQ(0, message.packed_fixed64_size());
+  EXPECT_EQ(0, message.packed_sfixed32_size());
+  EXPECT_EQ(0, message.packed_sfixed64_size());
+  EXPECT_EQ(0, message.packed_float_size());
+  EXPECT_EQ(0, message.packed_double_size());
+  EXPECT_EQ(0, message.packed_bool_size());
+  EXPECT_EQ(0, message.packed_enum_size());
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedFieldsModified(
+    const UNITTEST::TestPackedTypes& message) {
+  // Do the same for packed repeated fields.
+  ASSERT_EQ(2, message.packed_int32_size());
+  ASSERT_EQ(2, message.packed_int64_size());
+  ASSERT_EQ(2, message.packed_uint32_size());
+  ASSERT_EQ(2, message.packed_uint64_size());
+  ASSERT_EQ(2, message.packed_sint32_size());
+  ASSERT_EQ(2, message.packed_sint64_size());
+  ASSERT_EQ(2, message.packed_fixed32_size());
+  ASSERT_EQ(2, message.packed_fixed64_size());
+  ASSERT_EQ(2, message.packed_sfixed32_size());
+  ASSERT_EQ(2, message.packed_sfixed64_size());
+  ASSERT_EQ(2, message.packed_float_size());
+  ASSERT_EQ(2, message.packed_double_size());
+  ASSERT_EQ(2, message.packed_bool_size());
+  ASSERT_EQ(2, message.packed_enum_size());
+
+  EXPECT_EQ(601, message.packed_int32(0));
+  EXPECT_EQ(602, message.packed_int64(0));
+  EXPECT_EQ(603, message.packed_uint32(0));
+  EXPECT_EQ(604, message.packed_uint64(0));
+  EXPECT_EQ(605, message.packed_sint32(0));
+  EXPECT_EQ(606, message.packed_sint64(0));
+  EXPECT_EQ(607, message.packed_fixed32(0));
+  EXPECT_EQ(608, message.packed_fixed64(0));
+  EXPECT_EQ(609, message.packed_sfixed32(0));
+  EXPECT_EQ(610, message.packed_sfixed64(0));
+  EXPECT_EQ(611, message.packed_float(0));
+  EXPECT_EQ(612, message.packed_double(0));
+  EXPECT_TRUE(message.packed_bool(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.packed_enum(0));
+  // Actually verify the second (modified) elements now.
+  EXPECT_EQ(801, message.packed_int32(1));
+  EXPECT_EQ(802, message.packed_int64(1));
+  EXPECT_EQ(803, message.packed_uint32(1));
+  EXPECT_EQ(804, message.packed_uint64(1));
+  EXPECT_EQ(805, message.packed_sint32(1));
+  EXPECT_EQ(806, message.packed_sint64(1));
+  EXPECT_EQ(807, message.packed_fixed32(1));
+  EXPECT_EQ(808, message.packed_fixed64(1));
+  EXPECT_EQ(809, message.packed_sfixed32(1));
+  EXPECT_EQ(810, message.packed_sfixed64(1));
+  EXPECT_EQ(811, message.packed_float(1));
+  EXPECT_EQ(812, message.packed_double(1));
+  EXPECT_TRUE(message.packed_bool(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO, message.packed_enum(1));
+}
+
+// ===================================================================
+// Extensions
+//
+// All this code is exactly equivalent to the above code except that it's
+// manipulating extension fields instead of normal ones.
+
+inline void TestUtil::SetAllExtensions(UNITTEST::TestAllExtensions* message) {
+  message->SetExtension(UNITTEST::optional_int32_extension, 101);
+  message->SetExtension(UNITTEST::optional_int64_extension, 102);
+  message->SetExtension(UNITTEST::optional_uint32_extension, 103);
+  message->SetExtension(UNITTEST::optional_uint64_extension, 104);
+  message->SetExtension(UNITTEST::optional_sint32_extension, 105);
+  message->SetExtension(UNITTEST::optional_sint64_extension, 106);
+  message->SetExtension(UNITTEST::optional_fixed32_extension, 107);
+  message->SetExtension(UNITTEST::optional_fixed64_extension, 108);
+  message->SetExtension(UNITTEST::optional_sfixed32_extension, 109);
+  message->SetExtension(UNITTEST::optional_sfixed64_extension, 110);
+  message->SetExtension(UNITTEST::optional_float_extension, 111);
+  message->SetExtension(UNITTEST::optional_double_extension, 112);
+  message->SetExtension(UNITTEST::optional_bool_extension, true);
+  message->SetExtension(UNITTEST::optional_string_extension, "115");
+  message->SetExtension(UNITTEST::optional_bytes_extension, "116");
+
+  message->MutableExtension(UNITTEST::optionalgroup_extension)->set_a(117);
+  message->MutableExtension(UNITTEST::optional_nested_message_extension)
+      ->set_bb(118);
+  message->MutableExtension(UNITTEST::optional_foreign_message_extension)
+      ->set_c(119);
+  message->MutableExtension(UNITTEST::optional_import_message_extension)
+      ->set_d(120);
+
+  message->SetExtension(UNITTEST::optional_nested_enum_extension,
+                        UNITTEST::TestAllTypes::BAZ);
+  message->SetExtension(UNITTEST::optional_foreign_enum_extension,
+                        UNITTEST::FOREIGN_BAZ);
+  message->SetExtension(UNITTEST::optional_import_enum_extension,
+                        UNITTEST_IMPORT::IMPORT_BAZ);
+
+  message->SetExtension(UNITTEST::optional_string_piece_extension, "124");
+  message->SetExtension(UNITTEST::optional_cord_extension, "125");
+
+  message->MutableExtension(UNITTEST::optional_public_import_message_extension)
+      ->set_e(126);
+  message->MutableExtension(UNITTEST::optional_lazy_message_extension)
+      ->set_bb(127);
+
+  // -----------------------------------------------------------------
+
+  message->AddExtension(UNITTEST::repeated_int32_extension, 201);
+  message->AddExtension(UNITTEST::repeated_int64_extension, 202);
+  message->AddExtension(UNITTEST::repeated_uint32_extension, 203);
+  message->AddExtension(UNITTEST::repeated_uint64_extension, 204);
+  message->AddExtension(UNITTEST::repeated_sint32_extension, 205);
+  message->AddExtension(UNITTEST::repeated_sint64_extension, 206);
+  message->AddExtension(UNITTEST::repeated_fixed32_extension, 207);
+  message->AddExtension(UNITTEST::repeated_fixed64_extension, 208);
+  message->AddExtension(UNITTEST::repeated_sfixed32_extension, 209);
+  message->AddExtension(UNITTEST::repeated_sfixed64_extension, 210);
+  message->AddExtension(UNITTEST::repeated_float_extension, 211);
+  message->AddExtension(UNITTEST::repeated_double_extension, 212);
+  message->AddExtension(UNITTEST::repeated_bool_extension, true);
+  message->AddExtension(UNITTEST::repeated_string_extension, "215");
+  message->AddExtension(UNITTEST::repeated_bytes_extension, "216");
+
+  message->AddExtension(UNITTEST::repeatedgroup_extension)->set_a(217);
+  message->AddExtension(UNITTEST::repeated_nested_message_extension)
+      ->set_bb(218);
+  message->AddExtension(UNITTEST::repeated_foreign_message_extension)
+      ->set_c(219);
+  message->AddExtension(UNITTEST::repeated_import_message_extension)
+      ->set_d(220);
+  message->AddExtension(UNITTEST::repeated_lazy_message_extension)->set_bb(227);
+
+  message->AddExtension(UNITTEST::repeated_nested_enum_extension,
+                        UNITTEST::TestAllTypes::BAR);
+  message->AddExtension(UNITTEST::repeated_foreign_enum_extension,
+                        UNITTEST::FOREIGN_BAR);
+  message->AddExtension(UNITTEST::repeated_import_enum_extension,
+                        UNITTEST_IMPORT::IMPORT_BAR);
+
+  message->AddExtension(UNITTEST::repeated_string_piece_extension, "224");
+  message->AddExtension(UNITTEST::repeated_cord_extension, "225");
+
+  // Add a second one of each field.
+  message->AddExtension(UNITTEST::repeated_int32_extension, 301);
+  message->AddExtension(UNITTEST::repeated_int64_extension, 302);
+  message->AddExtension(UNITTEST::repeated_uint32_extension, 303);
+  message->AddExtension(UNITTEST::repeated_uint64_extension, 304);
+  message->AddExtension(UNITTEST::repeated_sint32_extension, 305);
+  message->AddExtension(UNITTEST::repeated_sint64_extension, 306);
+  message->AddExtension(UNITTEST::repeated_fixed32_extension, 307);
+  message->AddExtension(UNITTEST::repeated_fixed64_extension, 308);
+  message->AddExtension(UNITTEST::repeated_sfixed32_extension, 309);
+  message->AddExtension(UNITTEST::repeated_sfixed64_extension, 310);
+  message->AddExtension(UNITTEST::repeated_float_extension, 311);
+  message->AddExtension(UNITTEST::repeated_double_extension, 312);
+  message->AddExtension(UNITTEST::repeated_bool_extension, false);
+  message->AddExtension(UNITTEST::repeated_string_extension, "315");
+  message->AddExtension(UNITTEST::repeated_bytes_extension, "316");
+
+  message->AddExtension(UNITTEST::repeatedgroup_extension)->set_a(317);
+  message->AddExtension(UNITTEST::repeated_nested_message_extension)
+      ->set_bb(318);
+  message->AddExtension(UNITTEST::repeated_foreign_message_extension)
+      ->set_c(319);
+  message->AddExtension(UNITTEST::repeated_import_message_extension)
+      ->set_d(320);
+  message->AddExtension(UNITTEST::repeated_lazy_message_extension)->set_bb(327);
+
+  message->AddExtension(UNITTEST::repeated_nested_enum_extension,
+                        UNITTEST::TestAllTypes::BAZ);
+  message->AddExtension(UNITTEST::repeated_foreign_enum_extension,
+                        UNITTEST::FOREIGN_BAZ);
+  message->AddExtension(UNITTEST::repeated_import_enum_extension,
+                        UNITTEST_IMPORT::IMPORT_BAZ);
+
+  message->AddExtension(UNITTEST::repeated_string_piece_extension, "324");
+  message->AddExtension(UNITTEST::repeated_cord_extension, "325");
+
+  // -----------------------------------------------------------------
+
+  message->SetExtension(UNITTEST::default_int32_extension, 401);
+  message->SetExtension(UNITTEST::default_int64_extension, 402);
+  message->SetExtension(UNITTEST::default_uint32_extension, 403);
+  message->SetExtension(UNITTEST::default_uint64_extension, 404);
+  message->SetExtension(UNITTEST::default_sint32_extension, 405);
+  message->SetExtension(UNITTEST::default_sint64_extension, 406);
+  message->SetExtension(UNITTEST::default_fixed32_extension, 407);
+  message->SetExtension(UNITTEST::default_fixed64_extension, 408);
+  message->SetExtension(UNITTEST::default_sfixed32_extension, 409);
+  message->SetExtension(UNITTEST::default_sfixed64_extension, 410);
+  message->SetExtension(UNITTEST::default_float_extension, 411);
+  message->SetExtension(UNITTEST::default_double_extension, 412);
+  message->SetExtension(UNITTEST::default_bool_extension, false);
+  message->SetExtension(UNITTEST::default_string_extension, "415");
+  message->SetExtension(UNITTEST::default_bytes_extension, "416");
+
+  message->SetExtension(UNITTEST::default_nested_enum_extension,
+                        UNITTEST::TestAllTypes::FOO);
+  message->SetExtension(UNITTEST::default_foreign_enum_extension,
+                        UNITTEST::FOREIGN_FOO);
+  message->SetExtension(UNITTEST::default_import_enum_extension,
+                        UNITTEST_IMPORT::IMPORT_FOO);
+
+  message->SetExtension(UNITTEST::default_string_piece_extension, "424");
+  message->SetExtension(UNITTEST::default_cord_extension, "425");
+
+  SetOneofFields(message);
+}
+
+inline void TestUtil::SetOneofFields(UNITTEST::TestAllExtensions* message) {
+  message->SetExtension(UNITTEST::oneof_uint32_extension, 601);
+  message->MutableExtension(UNITTEST::oneof_nested_message_extension)
+      ->set_bb(602);
+  message->SetExtension(UNITTEST::oneof_string_extension, "603");
+  message->SetExtension(UNITTEST::oneof_bytes_extension, "604");
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::SetAllFieldsAndExtensions(
+    UNITTEST::TestFieldOrderings* message) {
+  GOOGLE_CHECK(message);
+  message->set_my_int(1);
+  message->set_my_string("foo");
+  message->set_my_float(1.0);
+  message->SetExtension(UNITTEST::my_extension_int, 23);
+  message->SetExtension(UNITTEST::my_extension_string, "bar");
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ModifyRepeatedExtensions(
+    UNITTEST::TestAllExtensions* message) {
+  message->SetExtension(UNITTEST::repeated_int32_extension, 1, 501);
+  message->SetExtension(UNITTEST::repeated_int64_extension, 1, 502);
+  message->SetExtension(UNITTEST::repeated_uint32_extension, 1, 503);
+  message->SetExtension(UNITTEST::repeated_uint64_extension, 1, 504);
+  message->SetExtension(UNITTEST::repeated_sint32_extension, 1, 505);
+  message->SetExtension(UNITTEST::repeated_sint64_extension, 1, 506);
+  message->SetExtension(UNITTEST::repeated_fixed32_extension, 1, 507);
+  message->SetExtension(UNITTEST::repeated_fixed64_extension, 1, 508);
+  message->SetExtension(UNITTEST::repeated_sfixed32_extension, 1, 509);
+  message->SetExtension(UNITTEST::repeated_sfixed64_extension, 1, 510);
+  message->SetExtension(UNITTEST::repeated_float_extension, 1, 511);
+  message->SetExtension(UNITTEST::repeated_double_extension, 1, 512);
+  message->SetExtension(UNITTEST::repeated_bool_extension, 1, true);
+  message->SetExtension(UNITTEST::repeated_string_extension, 1, "515");
+  message->SetExtension(UNITTEST::repeated_bytes_extension, 1, "516");
+
+  message->MutableExtension(UNITTEST::repeatedgroup_extension, 1)->set_a(517);
+  message->MutableExtension(UNITTEST::repeated_nested_message_extension, 1)
+      ->set_bb(518);
+  message->MutableExtension(UNITTEST::repeated_foreign_message_extension, 1)
+      ->set_c(519);
+  message->MutableExtension(UNITTEST::repeated_import_message_extension, 1)
+      ->set_d(520);
+  message->MutableExtension(UNITTEST::repeated_lazy_message_extension, 1)
+      ->set_bb(527);
+
+  message->SetExtension(UNITTEST::repeated_nested_enum_extension, 1,
+                        UNITTEST::TestAllTypes::FOO);
+  message->SetExtension(UNITTEST::repeated_foreign_enum_extension, 1,
+                        UNITTEST::FOREIGN_FOO);
+  message->SetExtension(UNITTEST::repeated_import_enum_extension, 1,
+                        UNITTEST_IMPORT::IMPORT_FOO);
+
+  message->SetExtension(UNITTEST::repeated_string_piece_extension, 1, "524");
+  message->SetExtension(UNITTEST::repeated_cord_extension, 1, "525");
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectAllExtensionsSet(
+    const UNITTEST::TestAllExtensions& message) {
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_int32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_int64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_uint32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_uint64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_sint32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_sint64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_fixed32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_fixed64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_sfixed32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_sfixed64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_float_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_double_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_bool_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_string_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_bytes_extension));
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optionalgroup_extension));
+  EXPECT_TRUE(
+      message.HasExtension(UNITTEST::optional_nested_message_extension));
+  EXPECT_TRUE(
+      message.HasExtension(UNITTEST::optional_foreign_message_extension));
+  EXPECT_TRUE(
+      message.HasExtension(UNITTEST::optional_import_message_extension));
+  EXPECT_TRUE(
+      message.HasExtension(UNITTEST::optional_public_import_message_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_lazy_message_extension));
+
+  EXPECT_TRUE(message.GetExtension(UNITTEST::optionalgroup_extension).has_a());
+  EXPECT_TRUE(message.GetExtension(UNITTEST::optional_nested_message_extension)
+                  .has_bb());
+  EXPECT_TRUE(message.GetExtension(UNITTEST::optional_foreign_message_extension)
+                  .has_c());
+  EXPECT_TRUE(message.GetExtension(UNITTEST::optional_import_message_extension)
+                  .has_d());
+  EXPECT_TRUE(
+      message.GetExtension(UNITTEST::optional_public_import_message_extension)
+          .has_e());
+  EXPECT_TRUE(
+      message.GetExtension(UNITTEST::optional_lazy_message_extension).has_bb());
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_nested_enum_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_foreign_enum_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_import_enum_extension));
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_string_piece_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::optional_cord_extension));
+
+  EXPECT_EQ(101, message.GetExtension(UNITTEST::optional_int32_extension));
+  EXPECT_EQ(102, message.GetExtension(UNITTEST::optional_int64_extension));
+  EXPECT_EQ(103, message.GetExtension(UNITTEST::optional_uint32_extension));
+  EXPECT_EQ(104, message.GetExtension(UNITTEST::optional_uint64_extension));
+  EXPECT_EQ(105, message.GetExtension(UNITTEST::optional_sint32_extension));
+  EXPECT_EQ(106, message.GetExtension(UNITTEST::optional_sint64_extension));
+  EXPECT_EQ(107, message.GetExtension(UNITTEST::optional_fixed32_extension));
+  EXPECT_EQ(108, message.GetExtension(UNITTEST::optional_fixed64_extension));
+  EXPECT_EQ(109, message.GetExtension(UNITTEST::optional_sfixed32_extension));
+  EXPECT_EQ(110, message.GetExtension(UNITTEST::optional_sfixed64_extension));
+  EXPECT_EQ(111, message.GetExtension(UNITTEST::optional_float_extension));
+  EXPECT_EQ(112, message.GetExtension(UNITTEST::optional_double_extension));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::optional_bool_extension));
+  EXPECT_EQ("115", message.GetExtension(UNITTEST::optional_string_extension));
+  EXPECT_EQ("116", message.GetExtension(UNITTEST::optional_bytes_extension));
+
+  EXPECT_EQ(117, message.GetExtension(UNITTEST::optionalgroup_extension).a());
+  EXPECT_EQ(
+      118,
+      message.GetExtension(UNITTEST::optional_nested_message_extension).bb());
+  EXPECT_EQ(
+      119,
+      message.GetExtension(UNITTEST::optional_foreign_message_extension).c());
+  EXPECT_EQ(
+      120,
+      message.GetExtension(UNITTEST::optional_import_message_extension).d());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ,
+            message.GetExtension(UNITTEST::optional_nested_enum_extension));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ,
+            message.GetExtension(UNITTEST::optional_foreign_enum_extension));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ,
+            message.GetExtension(UNITTEST::optional_import_enum_extension));
+
+  EXPECT_EQ("124",
+            message.GetExtension(UNITTEST::optional_string_piece_extension));
+  EXPECT_EQ("125", message.GetExtension(UNITTEST::optional_cord_extension));
+  EXPECT_EQ(
+      126,
+      message.GetExtension(UNITTEST::optional_public_import_message_extension)
+          .e());
+  EXPECT_EQ(
+      127,
+      message.GetExtension(UNITTEST::optional_lazy_message_extension).bb());
+
+  // -----------------------------------------------------------------
+
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_string_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bytes_extension));
+
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  ASSERT_EQ(
+      2, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_nested_enum_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_foreign_enum_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_import_enum_extension));
+
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_string_piece_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_cord_extension));
+
+  EXPECT_EQ(201, message.GetExtension(UNITTEST::repeated_int32_extension, 0));
+  EXPECT_EQ(202, message.GetExtension(UNITTEST::repeated_int64_extension, 0));
+  EXPECT_EQ(203, message.GetExtension(UNITTEST::repeated_uint32_extension, 0));
+  EXPECT_EQ(204, message.GetExtension(UNITTEST::repeated_uint64_extension, 0));
+  EXPECT_EQ(205, message.GetExtension(UNITTEST::repeated_sint32_extension, 0));
+  EXPECT_EQ(206, message.GetExtension(UNITTEST::repeated_sint64_extension, 0));
+  EXPECT_EQ(207, message.GetExtension(UNITTEST::repeated_fixed32_extension, 0));
+  EXPECT_EQ(208, message.GetExtension(UNITTEST::repeated_fixed64_extension, 0));
+  EXPECT_EQ(209,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 0));
+  EXPECT_EQ(210,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 0));
+  EXPECT_EQ(211, message.GetExtension(UNITTEST::repeated_float_extension, 0));
+  EXPECT_EQ(212, message.GetExtension(UNITTEST::repeated_double_extension, 0));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::repeated_bool_extension, 0));
+  EXPECT_EQ("215",
+            message.GetExtension(UNITTEST::repeated_string_extension, 0));
+  EXPECT_EQ("216", message.GetExtension(UNITTEST::repeated_bytes_extension, 0));
+
+  EXPECT_EQ(217,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 0).a());
+  EXPECT_EQ(218,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 0)
+                .bb());
+  EXPECT_EQ(
+      219, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 0)
+               .c());
+  EXPECT_EQ(
+      220,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 0).d());
+  EXPECT_EQ(
+      227,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 0).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 0));
+
+  EXPECT_EQ("224",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 0));
+  EXPECT_EQ("225", message.GetExtension(UNITTEST::repeated_cord_extension, 0));
+
+  EXPECT_EQ(301, message.GetExtension(UNITTEST::repeated_int32_extension, 1));
+  EXPECT_EQ(302, message.GetExtension(UNITTEST::repeated_int64_extension, 1));
+  EXPECT_EQ(303, message.GetExtension(UNITTEST::repeated_uint32_extension, 1));
+  EXPECT_EQ(304, message.GetExtension(UNITTEST::repeated_uint64_extension, 1));
+  EXPECT_EQ(305, message.GetExtension(UNITTEST::repeated_sint32_extension, 1));
+  EXPECT_EQ(306, message.GetExtension(UNITTEST::repeated_sint64_extension, 1));
+  EXPECT_EQ(307, message.GetExtension(UNITTEST::repeated_fixed32_extension, 1));
+  EXPECT_EQ(308, message.GetExtension(UNITTEST::repeated_fixed64_extension, 1));
+  EXPECT_EQ(309,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 1));
+  EXPECT_EQ(310,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 1));
+  EXPECT_EQ(311, message.GetExtension(UNITTEST::repeated_float_extension, 1));
+  EXPECT_EQ(312, message.GetExtension(UNITTEST::repeated_double_extension, 1));
+  EXPECT_FALSE(message.GetExtension(UNITTEST::repeated_bool_extension, 1));
+  EXPECT_EQ("315",
+            message.GetExtension(UNITTEST::repeated_string_extension, 1));
+  EXPECT_EQ("316", message.GetExtension(UNITTEST::repeated_bytes_extension, 1));
+
+  EXPECT_EQ(317,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 1).a());
+  EXPECT_EQ(318,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 1)
+                .bb());
+  EXPECT_EQ(
+      319, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 1)
+               .c());
+  EXPECT_EQ(
+      320,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 1).d());
+  EXPECT_EQ(
+      327,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 1).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 1));
+
+  EXPECT_EQ("324",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 1));
+  EXPECT_EQ("325", message.GetExtension(UNITTEST::repeated_cord_extension, 1));
+
+  // -----------------------------------------------------------------
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_int32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_int64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_uint32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_uint64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_sint32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_sint64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_fixed32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_fixed64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_sfixed32_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_sfixed64_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_float_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_double_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_bool_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_string_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_bytes_extension));
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_nested_enum_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_foreign_enum_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_import_enum_extension));
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_string_piece_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::default_cord_extension));
+
+  EXPECT_EQ(401, message.GetExtension(UNITTEST::default_int32_extension));
+  EXPECT_EQ(402, message.GetExtension(UNITTEST::default_int64_extension));
+  EXPECT_EQ(403, message.GetExtension(UNITTEST::default_uint32_extension));
+  EXPECT_EQ(404, message.GetExtension(UNITTEST::default_uint64_extension));
+  EXPECT_EQ(405, message.GetExtension(UNITTEST::default_sint32_extension));
+  EXPECT_EQ(406, message.GetExtension(UNITTEST::default_sint64_extension));
+  EXPECT_EQ(407, message.GetExtension(UNITTEST::default_fixed32_extension));
+  EXPECT_EQ(408, message.GetExtension(UNITTEST::default_fixed64_extension));
+  EXPECT_EQ(409, message.GetExtension(UNITTEST::default_sfixed32_extension));
+  EXPECT_EQ(410, message.GetExtension(UNITTEST::default_sfixed64_extension));
+  EXPECT_EQ(411, message.GetExtension(UNITTEST::default_float_extension));
+  EXPECT_EQ(412, message.GetExtension(UNITTEST::default_double_extension));
+  EXPECT_FALSE(message.GetExtension(UNITTEST::default_bool_extension));
+  EXPECT_EQ("415", message.GetExtension(UNITTEST::default_string_extension));
+  EXPECT_EQ("416", message.GetExtension(UNITTEST::default_bytes_extension));
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO,
+            message.GetExtension(UNITTEST::default_nested_enum_extension));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO,
+            message.GetExtension(UNITTEST::default_foreign_enum_extension));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO,
+            message.GetExtension(UNITTEST::default_import_enum_extension));
+
+  EXPECT_EQ("424",
+            message.GetExtension(UNITTEST::default_string_piece_extension));
+  EXPECT_EQ("425", message.GetExtension(UNITTEST::default_cord_extension));
+
+  EXPECT_TRUE(message.HasExtension(UNITTEST::oneof_uint32_extension));
+  EXPECT_TRUE(
+      message.GetExtension(UNITTEST::oneof_nested_message_extension).has_bb());
+  EXPECT_TRUE(message.HasExtension(UNITTEST::oneof_string_extension));
+  EXPECT_TRUE(message.HasExtension(UNITTEST::oneof_bytes_extension));
+
+  EXPECT_EQ(601, message.GetExtension(UNITTEST::oneof_uint32_extension));
+  EXPECT_EQ(
+      602, message.GetExtension(UNITTEST::oneof_nested_message_extension).bb());
+  EXPECT_EQ("603", message.GetExtension(UNITTEST::oneof_string_extension));
+  EXPECT_EQ("604", message.GetExtension(UNITTEST::oneof_bytes_extension));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectExtensionsClear(
+    const UNITTEST::TestAllExtensions& message) {
+  string serialized;
+  ASSERT_TRUE(message.SerializeToString(&serialized));
+  EXPECT_EQ("", serialized);
+  EXPECT_EQ(0, message.ByteSizeLong());
+
+  // has_blah() should initially be false for all optional fields.
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_int32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_int64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_uint32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_uint64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_sint32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_sint64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_fixed32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_fixed64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_sfixed32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_sfixed64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_float_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_double_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_bool_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_string_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_bytes_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optionalgroup_extension));
+  EXPECT_FALSE(
+      message.HasExtension(UNITTEST::optional_nested_message_extension));
+  EXPECT_FALSE(
+      message.HasExtension(UNITTEST::optional_foreign_message_extension));
+  EXPECT_FALSE(
+      message.HasExtension(UNITTEST::optional_import_message_extension));
+  EXPECT_FALSE(
+      message.HasExtension(UNITTEST::optional_public_import_message_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_lazy_message_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_nested_enum_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_foreign_enum_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_import_enum_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_string_piece_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::optional_cord_extension));
+
+  // Optional fields without defaults are set to zero or something like it.
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_int32_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_int64_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_uint32_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_uint64_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_sint32_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_sint64_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_fixed32_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_fixed64_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_sfixed32_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_sfixed64_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_float_extension));
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optional_double_extension));
+  EXPECT_FALSE(message.GetExtension(UNITTEST::optional_bool_extension));
+  EXPECT_EQ("", message.GetExtension(UNITTEST::optional_string_extension));
+  EXPECT_EQ("", message.GetExtension(UNITTEST::optional_bytes_extension));
+
+  // Embedded messages should also be clear.
+  EXPECT_FALSE(message.GetExtension(UNITTEST::optionalgroup_extension).has_a());
+  EXPECT_FALSE(message.GetExtension(UNITTEST::optional_nested_message_extension)
+                   .has_bb());
+  EXPECT_FALSE(
+      message.GetExtension(UNITTEST::optional_foreign_message_extension)
+          .has_c());
+  EXPECT_FALSE(message.GetExtension(UNITTEST::optional_import_message_extension)
+                   .has_d());
+  EXPECT_FALSE(
+      message.GetExtension(UNITTEST::optional_public_import_message_extension)
+          .has_e());
+  EXPECT_FALSE(
+      message.GetExtension(UNITTEST::optional_lazy_message_extension).has_bb());
+
+  EXPECT_EQ(0, message.GetExtension(UNITTEST::optionalgroup_extension).a());
+  EXPECT_EQ(
+      0,
+      message.GetExtension(UNITTEST::optional_nested_message_extension).bb());
+  EXPECT_EQ(
+      0,
+      message.GetExtension(UNITTEST::optional_foreign_message_extension).c());
+  EXPECT_EQ(
+      0, message.GetExtension(UNITTEST::optional_import_message_extension).d());
+  EXPECT_EQ(
+      0,
+      message.GetExtension(UNITTEST::optional_public_import_message_extension)
+          .e());
+  EXPECT_EQ(
+      0, message.GetExtension(UNITTEST::optional_lazy_message_extension).bb());
+
+  // Enums without defaults are set to the first value in the enum.
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO,
+            message.GetExtension(UNITTEST::optional_nested_enum_extension));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO,
+            message.GetExtension(UNITTEST::optional_foreign_enum_extension));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO,
+            message.GetExtension(UNITTEST::optional_import_enum_extension));
+
+  EXPECT_EQ("",
+            message.GetExtension(UNITTEST::optional_string_piece_extension));
+  EXPECT_EQ("", message.GetExtension(UNITTEST::optional_cord_extension));
+
+  // Repeated fields are empty.
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_int32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_int64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_uint32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_uint64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_sint32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_sint64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_fixed32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_fixed64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_sfixed32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_sfixed64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_float_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_double_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_bool_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_string_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_bytes_extension));
+
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  EXPECT_EQ(0,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  EXPECT_EQ(
+      0, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  EXPECT_EQ(0,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  EXPECT_EQ(0,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_nested_enum_extension));
+  EXPECT_EQ(0,
+            message.ExtensionSize(UNITTEST::repeated_foreign_enum_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_import_enum_extension));
+
+  EXPECT_EQ(0,
+            message.ExtensionSize(UNITTEST::repeated_string_piece_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::repeated_cord_extension));
+
+  // has_blah() should also be false for all default fields.
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_int32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_int64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_uint32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_uint64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_sint32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_sint64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_fixed32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_fixed64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_sfixed32_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_sfixed64_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_float_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_double_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_bool_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_string_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_bytes_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_nested_enum_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_foreign_enum_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_import_enum_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_string_piece_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::default_cord_extension));
+
+  // Fields with defaults have their default values (duh).
+  EXPECT_EQ(41, message.GetExtension(UNITTEST::default_int32_extension));
+  EXPECT_EQ(42, message.GetExtension(UNITTEST::default_int64_extension));
+  EXPECT_EQ(43, message.GetExtension(UNITTEST::default_uint32_extension));
+  EXPECT_EQ(44, message.GetExtension(UNITTEST::default_uint64_extension));
+  EXPECT_EQ(-45, message.GetExtension(UNITTEST::default_sint32_extension));
+  EXPECT_EQ(46, message.GetExtension(UNITTEST::default_sint64_extension));
+  EXPECT_EQ(47, message.GetExtension(UNITTEST::default_fixed32_extension));
+  EXPECT_EQ(48, message.GetExtension(UNITTEST::default_fixed64_extension));
+  EXPECT_EQ(49, message.GetExtension(UNITTEST::default_sfixed32_extension));
+  EXPECT_EQ(-50, message.GetExtension(UNITTEST::default_sfixed64_extension));
+  EXPECT_EQ(51.5, message.GetExtension(UNITTEST::default_float_extension));
+  EXPECT_EQ(52e3, message.GetExtension(UNITTEST::default_double_extension));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::default_bool_extension));
+  EXPECT_EQ("hello", message.GetExtension(UNITTEST::default_string_extension));
+  EXPECT_EQ("world", message.GetExtension(UNITTEST::default_bytes_extension));
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR,
+            message.GetExtension(UNITTEST::default_nested_enum_extension));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::default_foreign_enum_extension));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR,
+            message.GetExtension(UNITTEST::default_import_enum_extension));
+
+  EXPECT_EQ("abc",
+            message.GetExtension(UNITTEST::default_string_piece_extension));
+  EXPECT_EQ("123", message.GetExtension(UNITTEST::default_cord_extension));
+
+  EXPECT_FALSE(message.HasExtension(UNITTEST::oneof_uint32_extension));
+  EXPECT_FALSE(
+      message.GetExtension(UNITTEST::oneof_nested_message_extension).has_bb());
+  EXPECT_FALSE(message.HasExtension(UNITTEST::oneof_string_extension));
+  EXPECT_FALSE(message.HasExtension(UNITTEST::oneof_bytes_extension));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectRepeatedExtensionsModified(
+    const UNITTEST::TestAllExtensions& message) {
+  // ModifyRepeatedFields only sets the second repeated element of each
+  // field.  In addition to verifying this, we also verify that the first
+  // element and size were *not* modified.
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_string_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bytes_extension));
+
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  ASSERT_EQ(
+      2, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_nested_enum_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_foreign_enum_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_import_enum_extension));
+
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_string_piece_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_cord_extension));
+
+  EXPECT_EQ(201, message.GetExtension(UNITTEST::repeated_int32_extension, 0));
+  EXPECT_EQ(202, message.GetExtension(UNITTEST::repeated_int64_extension, 0));
+  EXPECT_EQ(203, message.GetExtension(UNITTEST::repeated_uint32_extension, 0));
+  EXPECT_EQ(204, message.GetExtension(UNITTEST::repeated_uint64_extension, 0));
+  EXPECT_EQ(205, message.GetExtension(UNITTEST::repeated_sint32_extension, 0));
+  EXPECT_EQ(206, message.GetExtension(UNITTEST::repeated_sint64_extension, 0));
+  EXPECT_EQ(207, message.GetExtension(UNITTEST::repeated_fixed32_extension, 0));
+  EXPECT_EQ(208, message.GetExtension(UNITTEST::repeated_fixed64_extension, 0));
+  EXPECT_EQ(209,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 0));
+  EXPECT_EQ(210,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 0));
+  EXPECT_EQ(211, message.GetExtension(UNITTEST::repeated_float_extension, 0));
+  EXPECT_EQ(212, message.GetExtension(UNITTEST::repeated_double_extension, 0));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::repeated_bool_extension, 0));
+  EXPECT_EQ("215",
+            message.GetExtension(UNITTEST::repeated_string_extension, 0));
+  EXPECT_EQ("216", message.GetExtension(UNITTEST::repeated_bytes_extension, 0));
+
+  EXPECT_EQ(217,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 0).a());
+  EXPECT_EQ(218,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 0)
+                .bb());
+  EXPECT_EQ(
+      219, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 0)
+               .c());
+  EXPECT_EQ(
+      220,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 0).d());
+  EXPECT_EQ(
+      227,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 0).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 0));
+
+  EXPECT_EQ("224",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 0));
+  EXPECT_EQ("225", message.GetExtension(UNITTEST::repeated_cord_extension, 0));
+
+  // Actually verify the second (modified) elements now.
+  EXPECT_EQ(501, message.GetExtension(UNITTEST::repeated_int32_extension, 1));
+  EXPECT_EQ(502, message.GetExtension(UNITTEST::repeated_int64_extension, 1));
+  EXPECT_EQ(503, message.GetExtension(UNITTEST::repeated_uint32_extension, 1));
+  EXPECT_EQ(504, message.GetExtension(UNITTEST::repeated_uint64_extension, 1));
+  EXPECT_EQ(505, message.GetExtension(UNITTEST::repeated_sint32_extension, 1));
+  EXPECT_EQ(506, message.GetExtension(UNITTEST::repeated_sint64_extension, 1));
+  EXPECT_EQ(507, message.GetExtension(UNITTEST::repeated_fixed32_extension, 1));
+  EXPECT_EQ(508, message.GetExtension(UNITTEST::repeated_fixed64_extension, 1));
+  EXPECT_EQ(509,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 1));
+  EXPECT_EQ(510,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 1));
+  EXPECT_EQ(511, message.GetExtension(UNITTEST::repeated_float_extension, 1));
+  EXPECT_EQ(512, message.GetExtension(UNITTEST::repeated_double_extension, 1));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::repeated_bool_extension, 1));
+  EXPECT_EQ("515",
+            message.GetExtension(UNITTEST::repeated_string_extension, 1));
+  EXPECT_EQ("516", message.GetExtension(UNITTEST::repeated_bytes_extension, 1));
+
+  EXPECT_EQ(517,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 1).a());
+  EXPECT_EQ(518,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 1)
+                .bb());
+  EXPECT_EQ(
+      519, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 1)
+               .c());
+  EXPECT_EQ(
+      520,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 1).d());
+  EXPECT_EQ(
+      527,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 1).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::FOO,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_FOO,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 1));
+
+  EXPECT_EQ("524",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 1));
+  EXPECT_EQ("525", message.GetExtension(UNITTEST::repeated_cord_extension, 1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::SetPackedExtensions(
+    UNITTEST::TestPackedExtensions* message) {
+  message->AddExtension(UNITTEST::packed_int32_extension, 601);
+  message->AddExtension(UNITTEST::packed_int64_extension, 602);
+  message->AddExtension(UNITTEST::packed_uint32_extension, 603);
+  message->AddExtension(UNITTEST::packed_uint64_extension, 604);
+  message->AddExtension(UNITTEST::packed_sint32_extension, 605);
+  message->AddExtension(UNITTEST::packed_sint64_extension, 606);
+  message->AddExtension(UNITTEST::packed_fixed32_extension, 607);
+  message->AddExtension(UNITTEST::packed_fixed64_extension, 608);
+  message->AddExtension(UNITTEST::packed_sfixed32_extension, 609);
+  message->AddExtension(UNITTEST::packed_sfixed64_extension, 610);
+  message->AddExtension(UNITTEST::packed_float_extension, 611);
+  message->AddExtension(UNITTEST::packed_double_extension, 612);
+  message->AddExtension(UNITTEST::packed_bool_extension, true);
+  message->AddExtension(UNITTEST::packed_enum_extension, UNITTEST::FOREIGN_BAR);
+  // add a second one of each field
+  message->AddExtension(UNITTEST::packed_int32_extension, 701);
+  message->AddExtension(UNITTEST::packed_int64_extension, 702);
+  message->AddExtension(UNITTEST::packed_uint32_extension, 703);
+  message->AddExtension(UNITTEST::packed_uint64_extension, 704);
+  message->AddExtension(UNITTEST::packed_sint32_extension, 705);
+  message->AddExtension(UNITTEST::packed_sint64_extension, 706);
+  message->AddExtension(UNITTEST::packed_fixed32_extension, 707);
+  message->AddExtension(UNITTEST::packed_fixed64_extension, 708);
+  message->AddExtension(UNITTEST::packed_sfixed32_extension, 709);
+  message->AddExtension(UNITTEST::packed_sfixed64_extension, 710);
+  message->AddExtension(UNITTEST::packed_float_extension, 711);
+  message->AddExtension(UNITTEST::packed_double_extension, 712);
+  message->AddExtension(UNITTEST::packed_bool_extension, false);
+  message->AddExtension(UNITTEST::packed_enum_extension, UNITTEST::FOREIGN_BAZ);
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ModifyPackedExtensions(
+    UNITTEST::TestPackedExtensions* message) {
+  message->SetExtension(UNITTEST::packed_int32_extension, 1, 801);
+  message->SetExtension(UNITTEST::packed_int64_extension, 1, 802);
+  message->SetExtension(UNITTEST::packed_uint32_extension, 1, 803);
+  message->SetExtension(UNITTEST::packed_uint64_extension, 1, 804);
+  message->SetExtension(UNITTEST::packed_sint32_extension, 1, 805);
+  message->SetExtension(UNITTEST::packed_sint64_extension, 1, 806);
+  message->SetExtension(UNITTEST::packed_fixed32_extension, 1, 807);
+  message->SetExtension(UNITTEST::packed_fixed64_extension, 1, 808);
+  message->SetExtension(UNITTEST::packed_sfixed32_extension, 1, 809);
+  message->SetExtension(UNITTEST::packed_sfixed64_extension, 1, 810);
+  message->SetExtension(UNITTEST::packed_float_extension, 1, 811);
+  message->SetExtension(UNITTEST::packed_double_extension, 1, 812);
+  message->SetExtension(UNITTEST::packed_bool_extension, 1, true);
+  message->SetExtension(UNITTEST::packed_enum_extension, 1,
+                        UNITTEST::FOREIGN_FOO);
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedExtensionsSet(
+    const UNITTEST::TestPackedExtensions& message) {
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_enum_extension));
+
+  EXPECT_EQ(601, message.GetExtension(UNITTEST::packed_int32_extension, 0));
+  EXPECT_EQ(602, message.GetExtension(UNITTEST::packed_int64_extension, 0));
+  EXPECT_EQ(603, message.GetExtension(UNITTEST::packed_uint32_extension, 0));
+  EXPECT_EQ(604, message.GetExtension(UNITTEST::packed_uint64_extension, 0));
+  EXPECT_EQ(605, message.GetExtension(UNITTEST::packed_sint32_extension, 0));
+  EXPECT_EQ(606, message.GetExtension(UNITTEST::packed_sint64_extension, 0));
+  EXPECT_EQ(607, message.GetExtension(UNITTEST::packed_fixed32_extension, 0));
+  EXPECT_EQ(608, message.GetExtension(UNITTEST::packed_fixed64_extension, 0));
+  EXPECT_EQ(609, message.GetExtension(UNITTEST::packed_sfixed32_extension, 0));
+  EXPECT_EQ(610, message.GetExtension(UNITTEST::packed_sfixed64_extension, 0));
+  EXPECT_EQ(611, message.GetExtension(UNITTEST::packed_float_extension, 0));
+  EXPECT_EQ(612, message.GetExtension(UNITTEST::packed_double_extension, 0));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::packed_bool_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::packed_enum_extension, 0));
+  EXPECT_EQ(701, message.GetExtension(UNITTEST::packed_int32_extension, 1));
+  EXPECT_EQ(702, message.GetExtension(UNITTEST::packed_int64_extension, 1));
+  EXPECT_EQ(703, message.GetExtension(UNITTEST::packed_uint32_extension, 1));
+  EXPECT_EQ(704, message.GetExtension(UNITTEST::packed_uint64_extension, 1));
+  EXPECT_EQ(705, message.GetExtension(UNITTEST::packed_sint32_extension, 1));
+  EXPECT_EQ(706, message.GetExtension(UNITTEST::packed_sint64_extension, 1));
+  EXPECT_EQ(707, message.GetExtension(UNITTEST::packed_fixed32_extension, 1));
+  EXPECT_EQ(708, message.GetExtension(UNITTEST::packed_fixed64_extension, 1));
+  EXPECT_EQ(709, message.GetExtension(UNITTEST::packed_sfixed32_extension, 1));
+  EXPECT_EQ(710, message.GetExtension(UNITTEST::packed_sfixed64_extension, 1));
+  EXPECT_EQ(711, message.GetExtension(UNITTEST::packed_float_extension, 1));
+  EXPECT_EQ(712, message.GetExtension(UNITTEST::packed_double_extension, 1));
+  EXPECT_FALSE(message.GetExtension(UNITTEST::packed_bool_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ,
+            message.GetExtension(UNITTEST::packed_enum_extension, 1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedExtensionsClear(
+    const UNITTEST::TestPackedExtensions& message) {
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_int32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_int64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_uint32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_uint64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_sint32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_sint64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_fixed32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_fixed64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_sfixed32_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_sfixed64_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_float_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_double_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_bool_extension));
+  EXPECT_EQ(0, message.ExtensionSize(UNITTEST::packed_enum_extension));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectPackedExtensionsModified(
+    const UNITTEST::TestPackedExtensions& message) {
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::packed_enum_extension));
+  EXPECT_EQ(601, message.GetExtension(UNITTEST::packed_int32_extension, 0));
+  EXPECT_EQ(602, message.GetExtension(UNITTEST::packed_int64_extension, 0));
+  EXPECT_EQ(603, message.GetExtension(UNITTEST::packed_uint32_extension, 0));
+  EXPECT_EQ(604, message.GetExtension(UNITTEST::packed_uint64_extension, 0));
+  EXPECT_EQ(605, message.GetExtension(UNITTEST::packed_sint32_extension, 0));
+  EXPECT_EQ(606, message.GetExtension(UNITTEST::packed_sint64_extension, 0));
+  EXPECT_EQ(607, message.GetExtension(UNITTEST::packed_fixed32_extension, 0));
+  EXPECT_EQ(608, message.GetExtension(UNITTEST::packed_fixed64_extension, 0));
+  EXPECT_EQ(609, message.GetExtension(UNITTEST::packed_sfixed32_extension, 0));
+  EXPECT_EQ(610, message.GetExtension(UNITTEST::packed_sfixed64_extension, 0));
+  EXPECT_EQ(611, message.GetExtension(UNITTEST::packed_float_extension, 0));
+  EXPECT_EQ(612, message.GetExtension(UNITTEST::packed_double_extension, 0));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::packed_bool_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::packed_enum_extension, 0));
+
+  // Actually verify the second (modified) elements now.
+  EXPECT_EQ(801, message.GetExtension(UNITTEST::packed_int32_extension, 1));
+  EXPECT_EQ(802, message.GetExtension(UNITTEST::packed_int64_extension, 1));
+  EXPECT_EQ(803, message.GetExtension(UNITTEST::packed_uint32_extension, 1));
+  EXPECT_EQ(804, message.GetExtension(UNITTEST::packed_uint64_extension, 1));
+  EXPECT_EQ(805, message.GetExtension(UNITTEST::packed_sint32_extension, 1));
+  EXPECT_EQ(806, message.GetExtension(UNITTEST::packed_sint64_extension, 1));
+  EXPECT_EQ(807, message.GetExtension(UNITTEST::packed_fixed32_extension, 1));
+  EXPECT_EQ(808, message.GetExtension(UNITTEST::packed_fixed64_extension, 1));
+  EXPECT_EQ(809, message.GetExtension(UNITTEST::packed_sfixed32_extension, 1));
+  EXPECT_EQ(810, message.GetExtension(UNITTEST::packed_sfixed64_extension, 1));
+  EXPECT_EQ(811, message.GetExtension(UNITTEST::packed_float_extension, 1));
+  EXPECT_EQ(812, message.GetExtension(UNITTEST::packed_double_extension, 1));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::packed_bool_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_FOO,
+            message.GetExtension(UNITTEST::packed_enum_extension, 1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectUnpackedExtensionsSet(
+    const UNITTEST::TestUnpackedExtensions& message) {
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::unpacked_enum_extension));
+
+  EXPECT_EQ(601, message.GetExtension(UNITTEST::unpacked_int32_extension, 0));
+  EXPECT_EQ(602, message.GetExtension(UNITTEST::unpacked_int64_extension, 0));
+  EXPECT_EQ(603, message.GetExtension(UNITTEST::unpacked_uint32_extension, 0));
+  EXPECT_EQ(604, message.GetExtension(UNITTEST::unpacked_uint64_extension, 0));
+  EXPECT_EQ(605, message.GetExtension(UNITTEST::unpacked_sint32_extension, 0));
+  EXPECT_EQ(606, message.GetExtension(UNITTEST::unpacked_sint64_extension, 0));
+  EXPECT_EQ(607, message.GetExtension(UNITTEST::unpacked_fixed32_extension, 0));
+  EXPECT_EQ(608, message.GetExtension(UNITTEST::unpacked_fixed64_extension, 0));
+  EXPECT_EQ(609,
+            message.GetExtension(UNITTEST::unpacked_sfixed32_extension, 0));
+  EXPECT_EQ(610,
+            message.GetExtension(UNITTEST::unpacked_sfixed64_extension, 0));
+  EXPECT_EQ(611, message.GetExtension(UNITTEST::unpacked_float_extension, 0));
+  EXPECT_EQ(612, message.GetExtension(UNITTEST::unpacked_double_extension, 0));
+  EXPECT_EQ(true, message.GetExtension(UNITTEST::unpacked_bool_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::unpacked_enum_extension, 0));
+  EXPECT_EQ(701, message.GetExtension(UNITTEST::unpacked_int32_extension, 1));
+  EXPECT_EQ(702, message.GetExtension(UNITTEST::unpacked_int64_extension, 1));
+  EXPECT_EQ(703, message.GetExtension(UNITTEST::unpacked_uint32_extension, 1));
+  EXPECT_EQ(704, message.GetExtension(UNITTEST::unpacked_uint64_extension, 1));
+  EXPECT_EQ(705, message.GetExtension(UNITTEST::unpacked_sint32_extension, 1));
+  EXPECT_EQ(706, message.GetExtension(UNITTEST::unpacked_sint64_extension, 1));
+  EXPECT_EQ(707, message.GetExtension(UNITTEST::unpacked_fixed32_extension, 1));
+  EXPECT_EQ(708, message.GetExtension(UNITTEST::unpacked_fixed64_extension, 1));
+  EXPECT_EQ(709,
+            message.GetExtension(UNITTEST::unpacked_sfixed32_extension, 1));
+  EXPECT_EQ(710,
+            message.GetExtension(UNITTEST::unpacked_sfixed64_extension, 1));
+  EXPECT_EQ(711, message.GetExtension(UNITTEST::unpacked_float_extension, 1));
+  EXPECT_EQ(712, message.GetExtension(UNITTEST::unpacked_double_extension, 1));
+  EXPECT_EQ(false, message.GetExtension(UNITTEST::unpacked_bool_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ,
+            message.GetExtension(UNITTEST::unpacked_enum_extension, 1));
+}
+
+// -------------------------------------------------------------------
+
+inline void TestUtil::ExpectLastRepeatedsRemoved(
+    const UNITTEST::TestAllTypes& message) {
+  ASSERT_EQ(1, message.repeated_int32_size());
+  ASSERT_EQ(1, message.repeated_int64_size());
+  ASSERT_EQ(1, message.repeated_uint32_size());
+  ASSERT_EQ(1, message.repeated_uint64_size());
+  ASSERT_EQ(1, message.repeated_sint32_size());
+  ASSERT_EQ(1, message.repeated_sint64_size());
+  ASSERT_EQ(1, message.repeated_fixed32_size());
+  ASSERT_EQ(1, message.repeated_fixed64_size());
+  ASSERT_EQ(1, message.repeated_sfixed32_size());
+  ASSERT_EQ(1, message.repeated_sfixed64_size());
+  ASSERT_EQ(1, message.repeated_float_size());
+  ASSERT_EQ(1, message.repeated_double_size());
+  ASSERT_EQ(1, message.repeated_bool_size());
+  ASSERT_EQ(1, message.repeated_string_size());
+  ASSERT_EQ(1, message.repeated_bytes_size());
+
+  ASSERT_EQ(1, message.repeatedgroup_size());
+  ASSERT_EQ(1, message.repeated_nested_message_size());
+  ASSERT_EQ(1, message.repeated_foreign_message_size());
+  ASSERT_EQ(1, message.repeated_import_message_size());
+  ASSERT_EQ(1, message.repeated_import_message_size());
+  ASSERT_EQ(1, message.repeated_nested_enum_size());
+  ASSERT_EQ(1, message.repeated_foreign_enum_size());
+  ASSERT_EQ(1, message.repeated_import_enum_size());
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  ASSERT_EQ(1, message.repeated_string_piece_size());
+  ASSERT_EQ(1, message.repeated_cord_size());
+#endif
+
+  // Test that the remaining element is the correct one.
+  EXPECT_EQ(201, message.repeated_int32(0));
+  EXPECT_EQ(202, message.repeated_int64(0));
+  EXPECT_EQ(203, message.repeated_uint32(0));
+  EXPECT_EQ(204, message.repeated_uint64(0));
+  EXPECT_EQ(205, message.repeated_sint32(0));
+  EXPECT_EQ(206, message.repeated_sint64(0));
+  EXPECT_EQ(207, message.repeated_fixed32(0));
+  EXPECT_EQ(208, message.repeated_fixed64(0));
+  EXPECT_EQ(209, message.repeated_sfixed32(0));
+  EXPECT_EQ(210, message.repeated_sfixed64(0));
+  EXPECT_EQ(211, message.repeated_float(0));
+  EXPECT_EQ(212, message.repeated_double(0));
+  EXPECT_TRUE(message.repeated_bool(0));
+  EXPECT_EQ("215", message.repeated_string(0));
+  EXPECT_EQ("216", message.repeated_bytes(0));
+
+  EXPECT_EQ(217, message.repeatedgroup(0).a());
+  EXPECT_EQ(218, message.repeated_nested_message(0).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message.repeated_nested_enum(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.repeated_foreign_enum(0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR, message.repeated_import_enum(0));
+}
+
+inline void TestUtil::ExpectLastRepeatedExtensionsRemoved(
+    const UNITTEST::TestAllExtensions& message) {
+  // Test that one element was removed.
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_int32_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_int64_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_uint32_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_uint64_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_sint32_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_sint64_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_fixed32_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_fixed64_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_sfixed32_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_sfixed64_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_float_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_double_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_bool_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_string_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_bytes_extension));
+
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  ASSERT_EQ(
+      1, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_nested_enum_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_foreign_enum_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_import_enum_extension));
+
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_string_piece_extension));
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeated_cord_extension));
+
+  // Test that the remaining element is the correct one.
+  EXPECT_EQ(201, message.GetExtension(UNITTEST::repeated_int32_extension, 0));
+  EXPECT_EQ(202, message.GetExtension(UNITTEST::repeated_int64_extension, 0));
+  EXPECT_EQ(203, message.GetExtension(UNITTEST::repeated_uint32_extension, 0));
+  EXPECT_EQ(204, message.GetExtension(UNITTEST::repeated_uint64_extension, 0));
+  EXPECT_EQ(205, message.GetExtension(UNITTEST::repeated_sint32_extension, 0));
+  EXPECT_EQ(206, message.GetExtension(UNITTEST::repeated_sint64_extension, 0));
+  EXPECT_EQ(207, message.GetExtension(UNITTEST::repeated_fixed32_extension, 0));
+  EXPECT_EQ(208, message.GetExtension(UNITTEST::repeated_fixed64_extension, 0));
+  EXPECT_EQ(209,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 0));
+  EXPECT_EQ(210,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 0));
+  EXPECT_EQ(211, message.GetExtension(UNITTEST::repeated_float_extension, 0));
+  EXPECT_EQ(212, message.GetExtension(UNITTEST::repeated_double_extension, 0));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::repeated_bool_extension, 0));
+  EXPECT_EQ("215",
+            message.GetExtension(UNITTEST::repeated_string_extension, 0));
+  EXPECT_EQ("216", message.GetExtension(UNITTEST::repeated_bytes_extension, 0));
+
+  EXPECT_EQ(217,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 0).a());
+  EXPECT_EQ(218,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 0)
+                .bb());
+  EXPECT_EQ(
+      219, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 0)
+               .c());
+  EXPECT_EQ(
+      220,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 0).d());
+  EXPECT_EQ(
+      227,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 0).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 0));
+
+  EXPECT_EQ("224",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 0));
+  EXPECT_EQ("225", message.GetExtension(UNITTEST::repeated_cord_extension, 0));
+}
+
+inline void TestUtil::ExpectLastRepeatedsReleased(
+    const UNITTEST::TestAllTypes& message) {
+  ASSERT_EQ(1, message.repeatedgroup_size());
+  ASSERT_EQ(1, message.repeated_nested_message_size());
+  ASSERT_EQ(1, message.repeated_foreign_message_size());
+  ASSERT_EQ(1, message.repeated_import_message_size());
+  ASSERT_EQ(1, message.repeated_import_message_size());
+
+  EXPECT_EQ(217, message.repeatedgroup(0).a());
+  EXPECT_EQ(218, message.repeated_nested_message(0).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+  EXPECT_EQ(220, message.repeated_import_message(0).d());
+}
+
+inline void TestUtil::ExpectLastRepeatedExtensionsReleased(
+    const UNITTEST::TestAllExtensions& message) {
+  ASSERT_EQ(1, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  ASSERT_EQ(
+      1, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  ASSERT_EQ(1,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+
+  EXPECT_EQ(217,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 0).a());
+  EXPECT_EQ(218,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 0)
+                .bb());
+  EXPECT_EQ(
+      219, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 0)
+               .c());
+  EXPECT_EQ(
+      220,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 0).d());
+  EXPECT_EQ(
+      227,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 0).bb());
+}
+
+inline void TestUtil::ExpectRepeatedsSwapped(
+    const UNITTEST::TestAllTypes& message) {
+  ASSERT_EQ(2, message.repeated_int32_size());
+  ASSERT_EQ(2, message.repeated_int64_size());
+  ASSERT_EQ(2, message.repeated_uint32_size());
+  ASSERT_EQ(2, message.repeated_uint64_size());
+  ASSERT_EQ(2, message.repeated_sint32_size());
+  ASSERT_EQ(2, message.repeated_sint64_size());
+  ASSERT_EQ(2, message.repeated_fixed32_size());
+  ASSERT_EQ(2, message.repeated_fixed64_size());
+  ASSERT_EQ(2, message.repeated_sfixed32_size());
+  ASSERT_EQ(2, message.repeated_sfixed64_size());
+  ASSERT_EQ(2, message.repeated_float_size());
+  ASSERT_EQ(2, message.repeated_double_size());
+  ASSERT_EQ(2, message.repeated_bool_size());
+  ASSERT_EQ(2, message.repeated_string_size());
+  ASSERT_EQ(2, message.repeated_bytes_size());
+
+  ASSERT_EQ(2, message.repeatedgroup_size());
+  ASSERT_EQ(2, message.repeated_nested_message_size());
+  ASSERT_EQ(2, message.repeated_foreign_message_size());
+  ASSERT_EQ(2, message.repeated_import_message_size());
+  ASSERT_EQ(2, message.repeated_import_message_size());
+  ASSERT_EQ(2, message.repeated_nested_enum_size());
+  ASSERT_EQ(2, message.repeated_foreign_enum_size());
+  ASSERT_EQ(2, message.repeated_import_enum_size());
+
+#ifndef PROTOBUF_TEST_NO_DESCRIPTORS
+  ASSERT_EQ(2, message.repeated_string_piece_size());
+  ASSERT_EQ(2, message.repeated_cord_size());
+#endif
+
+  // Test that the first element and second element are flipped.
+  EXPECT_EQ(201, message.repeated_int32(1));
+  EXPECT_EQ(202, message.repeated_int64(1));
+  EXPECT_EQ(203, message.repeated_uint32(1));
+  EXPECT_EQ(204, message.repeated_uint64(1));
+  EXPECT_EQ(205, message.repeated_sint32(1));
+  EXPECT_EQ(206, message.repeated_sint64(1));
+  EXPECT_EQ(207, message.repeated_fixed32(1));
+  EXPECT_EQ(208, message.repeated_fixed64(1));
+  EXPECT_EQ(209, message.repeated_sfixed32(1));
+  EXPECT_EQ(210, message.repeated_sfixed64(1));
+  EXPECT_EQ(211, message.repeated_float(1));
+  EXPECT_EQ(212, message.repeated_double(1));
+  EXPECT_TRUE(message.repeated_bool(1));
+  EXPECT_EQ("215", message.repeated_string(1));
+  EXPECT_EQ("216", message.repeated_bytes(1));
+
+  EXPECT_EQ(217, message.repeatedgroup(1).a());
+  EXPECT_EQ(218, message.repeated_nested_message(1).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(1).c());
+  EXPECT_EQ(220, message.repeated_import_message(1).d());
+  EXPECT_EQ(220, message.repeated_import_message(1).d());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR, message.repeated_nested_enum(1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR, message.repeated_foreign_enum(1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR, message.repeated_import_enum(1));
+
+  EXPECT_EQ(301, message.repeated_int32(0));
+  EXPECT_EQ(302, message.repeated_int64(0));
+  EXPECT_EQ(303, message.repeated_uint32(0));
+  EXPECT_EQ(304, message.repeated_uint64(0));
+  EXPECT_EQ(305, message.repeated_sint32(0));
+  EXPECT_EQ(306, message.repeated_sint64(0));
+  EXPECT_EQ(307, message.repeated_fixed32(0));
+  EXPECT_EQ(308, message.repeated_fixed64(0));
+  EXPECT_EQ(309, message.repeated_sfixed32(0));
+  EXPECT_EQ(310, message.repeated_sfixed64(0));
+  EXPECT_EQ(311, message.repeated_float(0));
+  EXPECT_EQ(312, message.repeated_double(0));
+  EXPECT_FALSE(message.repeated_bool(0));
+  EXPECT_EQ("315", message.repeated_string(0));
+  EXPECT_EQ("316", message.repeated_bytes(0));
+
+  EXPECT_EQ(317, message.repeatedgroup(0).a());
+  EXPECT_EQ(318, message.repeated_nested_message(0).bb());
+  EXPECT_EQ(319, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(320, message.repeated_import_message(0).d());
+  EXPECT_EQ(320, message.repeated_import_message(0).d());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ, message.repeated_nested_enum(0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ, message.repeated_foreign_enum(0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ, message.repeated_import_enum(0));
+}
+
+inline void TestUtil::ExpectRepeatedExtensionsSwapped(
+    const UNITTEST::TestAllExtensions& message) {
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_int64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_uint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sint64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_fixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed32_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_sfixed64_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_float_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_double_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bool_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_string_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_bytes_extension));
+
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeatedgroup_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_nested_message_extension));
+  ASSERT_EQ(
+      2, message.ExtensionSize(UNITTEST::repeated_foreign_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_import_message_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_lazy_message_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_nested_enum_extension));
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_foreign_enum_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_import_enum_extension));
+
+  ASSERT_EQ(2,
+            message.ExtensionSize(UNITTEST::repeated_string_piece_extension));
+  ASSERT_EQ(2, message.ExtensionSize(UNITTEST::repeated_cord_extension));
+
+  EXPECT_EQ(201, message.GetExtension(UNITTEST::repeated_int32_extension, 1));
+  EXPECT_EQ(202, message.GetExtension(UNITTEST::repeated_int64_extension, 1));
+  EXPECT_EQ(203, message.GetExtension(UNITTEST::repeated_uint32_extension, 1));
+  EXPECT_EQ(204, message.GetExtension(UNITTEST::repeated_uint64_extension, 1));
+  EXPECT_EQ(205, message.GetExtension(UNITTEST::repeated_sint32_extension, 1));
+  EXPECT_EQ(206, message.GetExtension(UNITTEST::repeated_sint64_extension, 1));
+  EXPECT_EQ(207, message.GetExtension(UNITTEST::repeated_fixed32_extension, 1));
+  EXPECT_EQ(208, message.GetExtension(UNITTEST::repeated_fixed64_extension, 1));
+  EXPECT_EQ(209,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 1));
+  EXPECT_EQ(210,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 1));
+  EXPECT_EQ(211, message.GetExtension(UNITTEST::repeated_float_extension, 1));
+  EXPECT_EQ(212, message.GetExtension(UNITTEST::repeated_double_extension, 1));
+  EXPECT_TRUE(message.GetExtension(UNITTEST::repeated_bool_extension, 1));
+  EXPECT_EQ("215",
+            message.GetExtension(UNITTEST::repeated_string_extension, 1));
+  EXPECT_EQ("216", message.GetExtension(UNITTEST::repeated_bytes_extension, 1));
+
+  EXPECT_EQ(217,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 1).a());
+  EXPECT_EQ(218,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 1)
+                .bb());
+  EXPECT_EQ(
+      219, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 1)
+               .c());
+  EXPECT_EQ(
+      220,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 1).d());
+  EXPECT_EQ(
+      227,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 1).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAR,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 1));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAR,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 1));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAR,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 1));
+
+  EXPECT_EQ("224",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 1));
+  EXPECT_EQ("225", message.GetExtension(UNITTEST::repeated_cord_extension, 1));
+
+  EXPECT_EQ(301, message.GetExtension(UNITTEST::repeated_int32_extension, 0));
+  EXPECT_EQ(302, message.GetExtension(UNITTEST::repeated_int64_extension, 0));
+  EXPECT_EQ(303, message.GetExtension(UNITTEST::repeated_uint32_extension, 0));
+  EXPECT_EQ(304, message.GetExtension(UNITTEST::repeated_uint64_extension, 0));
+  EXPECT_EQ(305, message.GetExtension(UNITTEST::repeated_sint32_extension, 0));
+  EXPECT_EQ(306, message.GetExtension(UNITTEST::repeated_sint64_extension, 0));
+  EXPECT_EQ(307, message.GetExtension(UNITTEST::repeated_fixed32_extension, 0));
+  EXPECT_EQ(308, message.GetExtension(UNITTEST::repeated_fixed64_extension, 0));
+  EXPECT_EQ(309,
+            message.GetExtension(UNITTEST::repeated_sfixed32_extension, 0));
+  EXPECT_EQ(310,
+            message.GetExtension(UNITTEST::repeated_sfixed64_extension, 0));
+  EXPECT_EQ(311, message.GetExtension(UNITTEST::repeated_float_extension, 0));
+  EXPECT_EQ(312, message.GetExtension(UNITTEST::repeated_double_extension, 0));
+  EXPECT_FALSE(message.GetExtension(UNITTEST::repeated_bool_extension, 0));
+  EXPECT_EQ("315",
+            message.GetExtension(UNITTEST::repeated_string_extension, 0));
+  EXPECT_EQ("316", message.GetExtension(UNITTEST::repeated_bytes_extension, 0));
+
+  EXPECT_EQ(317,
+            message.GetExtension(UNITTEST::repeatedgroup_extension, 0).a());
+  EXPECT_EQ(318,
+            message.GetExtension(UNITTEST::repeated_nested_message_extension, 0)
+                .bb());
+  EXPECT_EQ(
+      319, message.GetExtension(UNITTEST::repeated_foreign_message_extension, 0)
+               .c());
+  EXPECT_EQ(
+      320,
+      message.GetExtension(UNITTEST::repeated_import_message_extension, 0).d());
+  EXPECT_EQ(
+      327,
+      message.GetExtension(UNITTEST::repeated_lazy_message_extension, 0).bb());
+
+  EXPECT_EQ(UNITTEST::TestAllTypes::BAZ,
+            message.GetExtension(UNITTEST::repeated_nested_enum_extension, 0));
+  EXPECT_EQ(UNITTEST::FOREIGN_BAZ,
+            message.GetExtension(UNITTEST::repeated_foreign_enum_extension, 0));
+  EXPECT_EQ(UNITTEST_IMPORT::IMPORT_BAZ,
+            message.GetExtension(UNITTEST::repeated_import_enum_extension, 0));
+
+  EXPECT_EQ("324",
+            message.GetExtension(UNITTEST::repeated_string_piece_extension, 0));
+  EXPECT_EQ("325", message.GetExtension(UNITTEST::repeated_cord_extension, 0));
+}
+
+inline void TestUtil::SetOneof1(UNITTEST::TestOneof2* message) {
+  message->mutable_foo_lazy_message()->set_qux_int(100);
+  message->set_bar_string("101");
+  message->set_baz_int(102);
+  message->set_baz_string("103");
+}
+
+inline void TestUtil::SetOneof2(UNITTEST::TestOneof2* message) {
+  message->set_foo_int(200);
+  message->set_bar_enum(UNITTEST::TestOneof2::BAZ);
+  message->set_baz_int(202);
+  message->set_baz_string("203");
+}
+
+inline void TestUtil::ExpectOneofSet1(const UNITTEST::TestOneof2& message) {
+  ExpectAtMostOneFieldSetInOneof(message);
+
+  EXPECT_TRUE(message.has_foo_lazy_message());
+  EXPECT_TRUE(message.foo_lazy_message().has_qux_int());
+
+  EXPECT_TRUE(message.has_bar_string());
+  EXPECT_TRUE(message.has_baz_int());
+  EXPECT_TRUE(message.has_baz_string());
+
+  ASSERT_EQ(0, message.foo_lazy_message().corge_int_size());
+
+  EXPECT_EQ(100, message.foo_lazy_message().qux_int());
+  EXPECT_EQ("101", message.bar_string());
+  EXPECT_EQ(102, message.baz_int());
+  EXPECT_EQ("103", message.baz_string());
+}
+
+inline void TestUtil::ExpectOneofSet2(const UNITTEST::TestOneof2& message) {
+  ExpectAtMostOneFieldSetInOneof(message);
+
+  EXPECT_TRUE(message.has_foo_int());
+  EXPECT_TRUE(message.has_bar_enum());
+  EXPECT_TRUE(message.has_baz_int());
+  EXPECT_TRUE(message.has_baz_string());
+
+  EXPECT_EQ(200, message.foo_int());
+  EXPECT_EQ(UNITTEST::TestOneof2::BAZ, message.bar_enum());
+  EXPECT_EQ(202, message.baz_int());
+  EXPECT_EQ("203", message.baz_string());
+}
+
+inline void TestUtil::ExpectOneofClear(const UNITTEST::TestOneof2& message) {
+  EXPECT_FALSE(message.has_foo_int());
+  EXPECT_FALSE(message.has_foo_string());
+  EXPECT_FALSE(message.has_foo_bytes());
+  EXPECT_FALSE(message.has_foo_enum());
+  EXPECT_FALSE(message.has_foo_message());
+  EXPECT_FALSE(message.has_foogroup());
+  EXPECT_FALSE(message.has_foo_lazy_message());
+
+  EXPECT_FALSE(message.has_bar_int());
+  EXPECT_FALSE(message.has_bar_string());
+  EXPECT_FALSE(message.has_bar_bytes());
+  EXPECT_FALSE(message.has_bar_enum());
+
+  EXPECT_FALSE(message.has_baz_int());
+  EXPECT_FALSE(message.has_baz_string());
+
+  EXPECT_EQ(UNITTEST::TestOneof2::FOO_NOT_SET, message.foo_case());
+  EXPECT_EQ(UNITTEST::TestOneof2::BAR_NOT_SET, message.bar_case());
+}
+
+inline void TestUtil::ExpectAtMostOneFieldSetInOneof(
+    const UNITTEST::TestOneof2& message) {
+  int count = 0;
+  if (message.has_foo_int()) count++;
+  if (message.has_foo_string()) count++;
+  if (message.has_foo_bytes()) count++;
+  if (message.has_foo_enum()) count++;
+  if (message.has_foo_message()) count++;
+  if (message.has_foogroup()) count++;
+  if (message.has_foo_lazy_message()) count++;
+  EXPECT_LE(count, 1);
+  count = 0;
+  if (message.has_bar_int()) count++;
+  if (message.has_bar_string()) count++;
+  if (message.has_bar_bytes()) count++;
+  if (message.has_bar_enum()) count++;
+  EXPECT_TRUE(count == 0 || count == 1);
+}
+
+// ===================================================================
+
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/test_util_lite.cc b/src/google/protobuf/test_util_lite.cc
index 388c0cbd..79c5abec 100644
--- a/src/google/protobuf/test_util_lite.cc
+++ b/src/google/protobuf/test_util_lite.cc
@@ -35,14 +35,9 @@
 #include <google/protobuf/test_util_lite.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
+#include <gtest/gtest.h>
 
 
-#define EXPECT_TRUE GOOGLE_CHECK
-#define ASSERT_TRUE GOOGLE_CHECK
-#define EXPECT_FALSE(COND) GOOGLE_CHECK(!(COND))
-#define EXPECT_EQ GOOGLE_CHECK_EQ
-#define ASSERT_EQ GOOGLE_CHECK_EQ
-
 namespace google {
 namespace protobuf {
 
diff --git a/src/google/protobuf/testing/file.cc b/src/google/protobuf/testing/file.cc
index 470512ed..26cb0a67 100644
--- a/src/google/protobuf/testing/file.cc
+++ b/src/google/protobuf/testing/file.cc
@@ -38,24 +38,31 @@
 #ifdef _MSC_VER
 #define WIN32_LEAN_AND_MEAN  // yeah, right
 #include <windows.h>         // Find*File().  :(
-#include <io.h>
-#include <direct.h>
+// #include <direct.h>
 #else
 #include <dirent.h>
 #include <unistd.h>
 #endif
 #include <errno.h>
 
+#include <google/protobuf/stubs/io_win32.h>
+
 namespace google {
 namespace protobuf {
 
 #ifdef _WIN32
-#define mkdir(name, mode) mkdir(name)
 // Windows doesn't have symbolic links.
 #define lstat stat
-#ifndef F_OK
-#define F_OK 00  // not defined by MSVC for whatever reason
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
 #endif
+
+#ifdef _WIN32
+using google::protobuf::internal::win32::access;
+using google::protobuf::internal::win32::chdir;
+using google::protobuf::internal::win32::fopen;
+using google::protobuf::internal::win32::mkdir;
+using google::protobuf::internal::win32::stat;
 #endif
 
 bool File::Exists(const string& name) {
@@ -113,6 +120,9 @@ void File::WriteStringToFileOrDie(const string& contents, const string& name) {
 }
 
 bool File::CreateDir(const string& name, int mode) {
+  if (!name.empty()) {
+    GOOGLE_CHECK_OK(name[name.size() - 1] != '.');
+  }
   return mkdir(name.c_str(), mode) == 0;
 }
 
diff --git a/src/google/protobuf/testing/googletest.cc b/src/google/protobuf/testing/googletest.cc
index d45706b6..8c89e5af 100644
--- a/src/google/protobuf/testing/googletest.cc
+++ b/src/google/protobuf/testing/googletest.cc
@@ -33,14 +33,14 @@
 
 #include <google/protobuf/testing/googletest.h>
 #include <google/protobuf/testing/file.h>
+#include <google/protobuf/stubs/io_win32.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <stdlib.h>
 #ifdef _MSC_VER
-#include <io.h>
-#include <direct.h>
+// #include <direct.h>
 #else
 #include <unistd.h>
 #endif
@@ -53,7 +53,13 @@ namespace google {
 namespace protobuf {
 
 #ifdef _WIN32
-#define mkdir(name, mode) mkdir(name)
+// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
+// them like we do below.
+using google::protobuf::internal::win32::close;
+using google::protobuf::internal::win32::dup2;
+using google::protobuf::internal::win32::dup;
+using google::protobuf::internal::win32::mkdir;
+using google::protobuf::internal::win32::open;
 #endif
 
 #ifndef O_BINARY
@@ -111,14 +117,32 @@ string GetTemporaryDirectoryName() {
   char b[L_tmpnam + 1];     // HPUX multithread return 0 if s is 0
   string result = tmpnam(b);
 #ifdef _WIN32
+  // Avoid a trailing dot by changing it to an underscore. On Win32 the names of
+  // files and directories can, but should not, end with dot.
+  //
+  // In MS-DOS and FAT16 filesystem the filenames were 8dot3 style so it didn't
+  // make sense to have a name ending in dot without an extension, so the shell
+  // silently ignored trailing dots. To this day the Win32 API still maintains
+  // this behavior and silently ignores trailing dots in path arguments of
+  // functions such as CreateFile{A,W}. Even POSIX API function implementations
+  // seem to wrap the Win32 API functions (e.g. CreateDirectoryA) and behave
+  // this way.
+  // It's possible to avoid this behavior and create files / directories with
+  // trailing dots (using CreateFileW / CreateDirectoryW and prefixing the path
+  // with "\\?\") but these will be degenerate in the sense that you cannot
+  // chdir into such directories (or navigate into them with Windows Explorer)
+  // nor can you open such files with some programs (e.g. Notepad).
+  if (result[result.size() - 1] == '.') {
+    result[result.size() - 1] = '_';
+  }
   // On Win32, tmpnam() returns a file prefixed with '\', but which is supposed
   // to be used in the current working directory.  WTF?
   if (HasPrefixString(result, "\\")) {
     result.erase(0, 1);
   }
-  // The Win32 API accepts forward slashes as a path delimiter even though
-  // backslashes are standard.  Let's avoid confusion and use only forward
-  // slashes.
+  // The Win32 API accepts forward slashes as a path delimiter as long as the
+  // path doesn't use the "\\?\" prefix.
+  // Let's avoid confusion and use only forward slashes.
   result = StringReplace(result, "\\", "/", true);
 #endif  // _WIN32
   return result;
@@ -239,7 +263,7 @@ ScopedMemoryLog::~ScopedMemoryLog() {
   active_log_ = NULL;
 }
 
-const vector<string>& ScopedMemoryLog::GetMessages(LogLevel level) {
+const std::vector<string>& ScopedMemoryLog::GetMessages(LogLevel level) {
   GOOGLE_CHECK(level == ERROR ||
                level == WARNING);
   return messages_[level];
@@ -262,6 +286,8 @@ namespace {
 struct ForceShutdown {
   ~ForceShutdown() {
     ShutdownProtobufLibrary();
+    // Test to shutdown the library twice, which should succeed.
+    ShutdownProtobufLibrary();
   }
 } force_shutdown;
 
diff --git a/src/google/protobuf/testing/googletest.h b/src/google/protobuf/testing/googletest.h
index c0d99e69..81637486 100644
--- a/src/google/protobuf/testing/googletest.h
+++ b/src/google/protobuf/testing/googletest.h
@@ -37,9 +37,10 @@
 #include <map>
 #include <vector>
 #include <google/protobuf/stubs/common.h>
-
+#include <gmock/gmock.h>
 // Disable death tests if we use exceptions in CHECK().
-#if !PROTOBUF_USE_EXCEPTIONS && defined(GTEST_HAS_DEATH_TEST)
+#if !PROTOBUF_USE_EXCEPTIONS && defined(GTEST_HAS_DEATH_TEST) && \
+    !GTEST_OS_WINDOWS
 #define PROTOBUF_HAS_DEATH_TEST
 #endif
 
@@ -82,10 +83,10 @@ class ScopedMemoryLog {
   virtual ~ScopedMemoryLog();
 
   // Fetches all messages with the given severity level.
-  const vector<string>& GetMessages(LogLevel error);
+  const std::vector<string>& GetMessages(LogLevel error);
 
  private:
-  map<LogLevel, vector<string> > messages_;
+  std::map<LogLevel, std::vector<string> > messages_;
   LogHandler* old_handler_;
 
   static void HandleLog(LogLevel level, const char* filename, int line,
diff --git a/src/google/protobuf/testing/zcgunzip.cc b/src/google/protobuf/testing/zcgunzip.cc
index 76f8cfe1..349ad86e 100644
--- a/src/google/protobuf/testing/zcgunzip.cc
+++ b/src/google/protobuf/testing/zcgunzip.cc
@@ -72,7 +72,10 @@ int main(int argc, const char** argv) {
     }
     if (inlen > 0) {
       int err = write(STDOUT_FILENO, inptr, inlen);
-      assert(err == inlen);
+      if (err != inlen) {
+        fprintf(stderr, "write unexpectedly returned %d.\n", err);
+        return 1;
+      }
     }
   }
 
diff --git a/src/google/protobuf/text_format.cc b/src/google/protobuf/text_format.cc
index 778b878e..0965fd7a 100644
--- a/src/google/protobuf/text_format.cc
+++ b/src/google/protobuf/text_format.cc
@@ -42,20 +42,22 @@
 
 #include <google/protobuf/text_format.h>
 
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/dynamic_message.h>
-#include <google/protobuf/repeated_field.h>
-#include <google/protobuf/wire_format_lite.h>
+#include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/any.h>
 #include <google/protobuf/io/strtod.h>
 #include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/tokenizer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/unknown_field_set.h>
 #include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/io/tokenizer.h>
-#include <google/protobuf/any.h>
-#include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/unknown_field_set.h>
+#include <google/protobuf/wire_format_lite.h>
 #include <google/protobuf/stubs/strutil.h>
+
+
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/stl_util.h>
 
@@ -74,18 +76,6 @@ inline bool IsOctNumber(const string& str) {
           (str[1] >= '0' && str[1] < '8'));
 }
 
-inline bool GetAnyFieldDescriptors(const Message& message,
-                                   const FieldDescriptor** type_url_field,
-                                   const FieldDescriptor** value_field) {
-    const Descriptor* descriptor = message.GetDescriptor();
-    *type_url_field = descriptor->FindFieldByNumber(1);
-    *value_field = descriptor->FindFieldByNumber(2);
-    return (*type_url_field != NULL &&
-            (*type_url_field)->type() == FieldDescriptor::TYPE_STRING &&
-            *value_field != NULL &&
-            (*value_field)->type() == FieldDescriptor::TYPE_BYTES);
-}
-
 }  // namespace
 
 string Message::DebugString() const {
@@ -200,6 +190,24 @@ TextFormat::ParseInfoTree* TextFormat::ParseInfoTree::GetTreeForNested(
   return (*trees)[index];
 }
 
+namespace {
+// These functions implement the behavior of the "default" TextFormat::Finder,
+// they are defined as standalone to be called when finder_ is NULL.
+const FieldDescriptor* DefaultFinderFindExtension(Message* message,
+                                                  const string& name) {
+  return message->GetReflection()->FindKnownExtensionByName(name);
+}
+
+const Descriptor* DefaultFinderFindAnyType(const Message& message,
+                                           const string& prefix,
+                                           const string& name) {
+  if (prefix != internal::kTypeGoogleApisComPrefix &&
+      prefix != internal::kTypeGoogleProdComPrefix) {
+    return NULL;
+  }
+  return message.GetDescriptor()->file()->pool()->FindMessageTypeByName(name);
+}
+}  // namespace
 
 // ===========================================================================
 // Internal class for parsing an ASCII representation of a Protocol Message.
@@ -228,7 +236,7 @@ class TextFormat::Parser::ParserImpl {
   ParserImpl(const Descriptor* root_message_type,
              io::ZeroCopyInputStream* input_stream,
              io::ErrorCollector* error_collector,
-             TextFormat::Finder* finder,
+             const TextFormat::Finder* finder,
              ParseInfoTree* parse_info_tree,
              SingularOverwritePolicy singular_overwrite_policy,
              bool allow_case_insensitive_field,
@@ -376,7 +384,7 @@ class TextFormat::Parser::ParserImpl {
     const Descriptor* descriptor = message->GetDescriptor();
 
     string field_name;
-
+    bool reserved_field = false;
     const FieldDescriptor* field = NULL;
     int start_line = tokenizer_.current().line;
     int start_column = tokenizer_.current().column;
@@ -391,9 +399,15 @@ class TextFormat::Parser::ParserImpl {
       DO(Consume("]"));
       TryConsume(":");  // ':' is optional between message labels and values.
       string serialized_value;
-      DO(ConsumeAnyValue(full_type_name,
-                         message->GetDescriptor()->file()->pool(),
-                         &serialized_value));
+      const Descriptor* value_descriptor =
+          finder_ ? finder_->FindAnyType(*message, prefix, full_type_name)
+                  : DefaultFinderFindAnyType(*message, prefix, full_type_name);
+      if (value_descriptor == NULL) {
+        ReportError("Could not find type \"" + prefix + full_type_name +
+                    "\" stored in google.protobuf.Any.");
+        return false;
+      }
+      DO(ConsumeAnyValue(value_descriptor, &serialized_value));
       if (singular_overwrite_policy_ == FORBID_SINGULAR_OVERWRITES) {
         // Fail if any_type_url_field has already been specified.
         if ((!any_type_url_field->is_repeated() &&
@@ -415,9 +429,8 @@ class TextFormat::Parser::ParserImpl {
       DO(ConsumeFullTypeName(&field_name));
       DO(Consume("]"));
 
-      field = (finder_ != NULL
-               ? finder_->FindExtension(message, field_name)
-               : reflection->FindKnownExtensionByName(field_name));
+      field = finder_ ? finder_->FindExtension(message, field_name)
+                      : DefaultFinderFindExtension(message, field_name);
 
       if (field == NULL) {
         if (!allow_unknown_field_) {
@@ -438,6 +451,8 @@ class TextFormat::Parser::ParserImpl {
       if (allow_field_number_ && safe_strto32(field_name, &field_number)) {
         if (descriptor->IsExtensionNumber(field_number)) {
           field = reflection->FindKnownExtensionByNumber(field_number);
+        } else if (descriptor->IsReservedNumber(field_number)) {
+          reserved_field = true;
         } else {
           field = descriptor->FindFieldByNumber(field_number);
         }
@@ -466,9 +481,13 @@ class TextFormat::Parser::ParserImpl {
           LowerString(&lower_field_name);
           field = descriptor->FindFieldByLowercaseName(lower_field_name);
         }
+
+        if (field == NULL) {
+          reserved_field = descriptor->IsReservedName(field_name);
+        }
       }
 
-      if (field == NULL) {
+      if (field == NULL && !reserved_field) {
         if (!allow_unknown_field_) {
           ReportError("Message type \"" + descriptor->full_name() +
                       "\" has no field named \"" + field_name + "\".");
@@ -480,9 +499,10 @@ class TextFormat::Parser::ParserImpl {
       }
     }
 
-    // Skips unknown field.
+    // Skips unknown or reserved fields.
     if (field == NULL) {
-      GOOGLE_CHECK(allow_unknown_field_);
+      GOOGLE_CHECK(allow_unknown_field_ || reserved_field);
+
       // Try to guess the type of this field.
       // If this field is not a message, there should be a ":" between the
       // field name and the field value and also the field value should not
@@ -576,12 +596,12 @@ label_skip_parsing:
 
   // Skips the next field including the field's name and value.
   bool SkipField() {
-    string field_name;
     if (TryConsume("[")) {
-      // Extension name.
-      DO(ConsumeFullTypeName(&field_name));
+      // Extension name or type URL.
+      DO(ConsumeTypeUrlOrFullTypeName());
       DO(Consume("]"));
     } else {
+      string field_name;
       DO(ConsumeIdentifier(&field_name));
     }
 
@@ -885,6 +905,15 @@ label_skip_parsing:
     return true;
   }
 
+  bool ConsumeTypeUrlOrFullTypeName() {
+    string discarded;
+    DO(ConsumeIdentifier(&discarded));
+    while (TryConsume(".") || TryConsume("/")) {
+      DO(ConsumeIdentifier(&discarded));
+    }
+    return true;
+  }
+
   // Consumes a string and saves its value in the text parameter.
   // Returns false if the token is not of type STRING.
   bool ConsumeString(string* text) {
@@ -1033,44 +1062,29 @@ label_skip_parsing:
   bool ConsumeAnyTypeUrl(string* full_type_name, string* prefix) {
     // TODO(saito) Extend Consume() to consume multiple tokens at once, so that
     // this code can be written as just DO(Consume(kGoogleApisTypePrefix)).
-    string url1, url2, url3;
-    DO(ConsumeIdentifier(&url1));  // type
-    DO(Consume("."));
-    DO(ConsumeIdentifier(&url2));  // googleapis
-    DO(Consume("."));
-    DO(ConsumeIdentifier(&url3));  // com
+    DO(ConsumeIdentifier(prefix));
+    while (TryConsume(".")) {
+      string url;
+      DO(ConsumeIdentifier(&url));
+      *prefix += "." + url;
+    }
     DO(Consume("/"));
+    *prefix += "/";
     DO(ConsumeFullTypeName(full_type_name));
 
-    *prefix = url1 + "." + url2 + "." + url3 + "/";
-    if (*prefix != internal::kTypeGoogleApisComPrefix &&
-        *prefix != internal::kTypeGoogleProdComPrefix) {
-      ReportError("TextFormat::Parser for Any supports only "
-                  "type.googleapis.com and type.googleprod.com, "
-                  "but found \"" + *prefix + "\"");
-      return false;
-    }
     return true;
   }
 
   // A helper function for reconstructing Any::value. Consumes a text of
-  // full_type_name, then serializes it into serialized_value. "pool" is used to
-  // look up and create a temporary object with full_type_name.
-  bool ConsumeAnyValue(const string& full_type_name, const DescriptorPool* pool,
+  // full_type_name, then serializes it into serialized_value.
+  bool ConsumeAnyValue(const Descriptor* value_descriptor,
                        string* serialized_value) {
-    const Descriptor* value_descriptor =
-        pool->FindMessageTypeByName(full_type_name);
-    if (value_descriptor == NULL) {
-      ReportError("Could not find type \"" + full_type_name +
-                  "\" stored in google.protobuf.Any.");
-      return false;
-    }
     DynamicMessageFactory factory;
     const Message* value_prototype = factory.GetPrototype(value_descriptor);
     if (value_prototype == NULL) {
       return false;
     }
-    google::protobuf::scoped_ptr<Message> value(value_prototype->New());
+    std::unique_ptr<Message> value(value_prototype->New());
     string sub_delimiter;
     DO(ConsumeMessageDelimiter(&sub_delimiter));
     DO(ConsumeMessage(value.get(), sub_delimiter));
@@ -1080,7 +1094,7 @@ label_skip_parsing:
     } else {
       if (!value->IsInitialized()) {
         ReportError(
-            "Value of type \"" + full_type_name +
+            "Value of type \"" + value_descriptor->full_name() +
             "\" stored in google.protobuf.Any has missing required fields");
         return false;
       }
@@ -1140,7 +1154,7 @@ label_skip_parsing:
   };
 
   io::ErrorCollector* error_collector_;
-  TextFormat::Finder* finder_;
+  const TextFormat::Finder* finder_;
   ParseInfoTree* parse_info_tree_;
   ParserErrorCollector tokenizer_error_collector_;
   io::Tokenizer tokenizer_;
@@ -1159,7 +1173,8 @@ label_skip_parsing:
 // ===========================================================================
 // Internal class for writing text to the io::ZeroCopyOutputStream. Adapted
 // from the Printer found in //google/protobuf/io/printer.h
-class TextFormat::Printer::TextGenerator {
+class TextFormat::Printer::TextGenerator
+    : public TextFormat::BaseTextGenerator {
  public:
   explicit TextGenerator(io::ZeroCopyOutputStream* output,
                          int initial_indent_level)
@@ -1168,9 +1183,8 @@ class TextFormat::Printer::TextGenerator {
       buffer_size_(0),
       at_start_of_line_(true),
       failed_(false),
-      indent_(""),
+      indent_level_(initial_indent_level),
       initial_indent_level_(initial_indent_level) {
-    indent_.resize(initial_indent_level_ * 2, ' ');
   }
 
   ~TextGenerator() {
@@ -1184,51 +1198,44 @@ class TextFormat::Printer::TextGenerator {
   // Indent text by two spaces.  After calling Indent(), two spaces will be
   // inserted at the beginning of each line of text.  Indent() may be called
   // multiple times to produce deeper indents.
-  void Indent() {
-    indent_ += "  ";
-  }
+  void Indent() override { ++indent_level_; }
 
   // Reduces the current indent level by two spaces, or crashes if the indent
   // level is zero.
-  void Outdent() {
-    if (indent_.empty() ||
-        indent_.size() < initial_indent_level_ * 2) {
+  void Outdent() override {
+    if (indent_level_ == 0 ||
+        indent_level_ < initial_indent_level_) {
       GOOGLE_LOG(DFATAL) << " Outdent() without matching Indent().";
       return;
     }
 
-    indent_.resize(indent_.size() - 2);
+    --indent_level_;
   }
 
   // Print text to the output stream.
-  void Print(const string& str) {
-    Print(str.data(), str.size());
-  }
-
-  // Print text to the output stream.
-  void Print(const char* text) {
-    Print(text, strlen(text));
-  }
-
-  // Print text to the output stream.
-  void Print(const char* text, size_t size) {
-    size_t pos = 0;  // The number of bytes we've written so far.
-
-    for (size_t i = 0; i < size; i++) {
-      if (text[i] == '\n') {
-        // Saw newline.  If there is more text, we may need to insert an indent
-        // here.  So, write what we have so far, including the '\n'.
-        Write(text + pos, i - pos + 1);
-        pos = i + 1;
-
-        // Setting this true will cause the next Write() to insert an indent
-        // first.
+  void Print(const char* text, size_t size) override {
+    if (indent_level_ > 0) {
+      size_t pos = 0;  // The number of bytes we've written so far.
+      for (size_t i = 0; i < size; i++) {
+        if (text[i] == '\n') {
+          // Saw newline.  If there is more text, we may need to insert an
+          // indent here.  So, write what we have so far, including the '\n'.
+          Write(text + pos, i - pos + 1);
+          pos = i + 1;
+
+          // Setting this true will cause the next Write() to insert an indent
+          // first.
+          at_start_of_line_ = true;
+        }
+      }
+      // Write the rest.
+      Write(text + pos, size - pos);
+    } else {
+      Write(text, size);
+      if (size > 0 && text[size - 1] == '\n') {
         at_start_of_line_ = true;
       }
     }
-
-    // Write the rest.
-    Write(text + pos, size - pos);
   }
 
   // True if any write to the underlying stream failed.  (We don't just
@@ -1246,15 +1253,39 @@ class TextFormat::Printer::TextGenerator {
     if (at_start_of_line_) {
       // Insert an indent.
       at_start_of_line_ = false;
-      Write(indent_.data(), indent_.size());
+      WriteIndent();
       if (failed_) return;
     }
 
     while (size > buffer_size_) {
       // Data exceeds space in the buffer.  Copy what we can and request a
       // new buffer.
-      memcpy(buffer_, data, buffer_size_);
-      data += buffer_size_;
+      if (buffer_size_ > 0) {
+        memcpy(buffer_, data, buffer_size_);
+        data += buffer_size_;
+        size -= buffer_size_;
+      }
+      void* void_buffer = NULL;
+      failed_ = !output_->Next(&void_buffer, &buffer_size_);
+      if (failed_) return;
+      buffer_ = reinterpret_cast<char*>(void_buffer);
+    }
+
+    // Buffer is big enough to receive the data; copy it.
+    memcpy(buffer_, data, size);
+    buffer_ += size;
+    buffer_size_ -= size;
+  }
+
+  void WriteIndent() {
+    if (indent_level_ == 0) { return; }
+    GOOGLE_DCHECK(!failed_);
+    int size = 2 * indent_level_;
+
+    while (size > buffer_size_) {
+      // Data exceeds space in the buffer. Write what we can and request a new
+      // buffer.
+      memset(buffer_, ' ', buffer_size_);
       size -= buffer_size_;
       void* void_buffer;
       failed_ = !output_->Next(&void_buffer, &buffer_size_);
@@ -1263,7 +1294,7 @@ class TextFormat::Printer::TextGenerator {
     }
 
     // Buffer is big enough to receive the data; copy it.
-    memcpy(buffer_, data, size);
+    memset(buffer_, ' ', size);
     buffer_ += size;
     buffer_size_ -= size;
   }
@@ -1274,15 +1305,28 @@ class TextFormat::Printer::TextGenerator {
   bool at_start_of_line_;
   bool failed_;
 
-  string indent_;
+  int indent_level_;
   int initial_indent_level_;
 };
 
 // ===========================================================================
-
+// Implementation of the default Finder for extensions.
 TextFormat::Finder::~Finder() {
 }
 
+const FieldDescriptor* TextFormat::Finder::FindExtension(
+    Message* message, const string& name) const {
+  return DefaultFinderFindExtension(message, name);
+}
+
+const Descriptor* TextFormat::Finder::FindAnyType(const Message& message,
+                                                  const string& prefix,
+                                                  const string& name) const {
+  return DefaultFinderFindAnyType(message, prefix, name);
+}
+
+// ===========================================================================
+
 TextFormat::Parser::Parser()
   : error_collector_(NULL),
     finder_(NULL),
@@ -1322,6 +1366,7 @@ bool TextFormat::Parser::ParseFromString(const string& input,
   return Parse(&input_stream, output);
 }
 
+
 bool TextFormat::Parser::Merge(io::ZeroCopyInputStream* input,
                                Message* output) {
   ParserImpl parser(output->GetDescriptor(), input, error_collector_,
@@ -1339,6 +1384,7 @@ bool TextFormat::Parser::MergeFromString(const string& input,
   return Merge(&input_stream, output);
 }
 
+
 bool TextFormat::Parser::MergeUsingImpl(io::ZeroCopyInputStream* /* input */,
                                         Message* output,
                                         ParserImpl* parser_impl) {
@@ -1346,8 +1392,9 @@ bool TextFormat::Parser::MergeUsingImpl(io::ZeroCopyInputStream* /* input */,
   if (!allow_partial_ && !output->IsInitialized()) {
     std::vector<string> missing_fields;
     output->FindInitializationErrors(&missing_fields);
-    parser_impl->ReportError(-1, 0, "Message missing required fields: " +
-                                        Join(missing_fields, ", "));
+    parser_impl->ReportError(-1, 0,
+                             "Message missing required fields: " +
+                                 Join(missing_fields, ", "));
     return false;
   }
   return true;
@@ -1387,92 +1434,290 @@ bool TextFormat::Parser::ParseFieldValueFromString(
   return Parser().MergeFromString(input, output);
 }
 
+
 // ===========================================================================
 
-// The default implementation for FieldValuePrinter. The base class just
-// does simple formatting. That way, deriving classes could decide to fallback
-// to that behavior.
+TextFormat::BaseTextGenerator::~BaseTextGenerator() {}
+
+namespace {
+
+// A BaseTextGenerator that writes to a string.
+class StringBaseTextGenerator : public TextFormat::BaseTextGenerator {
+ public:
+  void Print(const char* text, size_t size) { output_.append(text, size); }
+
+// Some compilers do not support ref-qualifiers even in C++11 mode.
+// Disable the optimization for now and revisit it later.
+#if 0 // LANG_CXX11
+  string Consume() && { return std::move(output_); }
+#else   // !LANG_CXX11
+  const string& Get() { return output_; }
+#endif  // LANG_CXX11
+
+ private:
+  string output_;
+};
+
+}  // namespace
+
+// The default implementation for FieldValuePrinter. We just delegate the
+// implementation to the default FastFieldValuePrinter to avoid duplicating the
+// logic.
 TextFormat::FieldValuePrinter::FieldValuePrinter() {}
 TextFormat::FieldValuePrinter::~FieldValuePrinter() {}
+
+#if 0 // LANG_CXX11
+#define FORWARD_IMPL(fn, ...)            \
+  StringBaseTextGenerator generator;     \
+  delegate_.fn(__VA_ARGS__, &generator); \
+  return std::move(generator).Consume()
+#else  // !LANG_CXX11
+#define FORWARD_IMPL(fn, ...)            \
+  StringBaseTextGenerator generator;     \
+  delegate_.fn(__VA_ARGS__, &generator); \
+  return generator.Get()
+#endif  // LANG_CXX11
+
 string TextFormat::FieldValuePrinter::PrintBool(bool val) const {
-  return val ? "true" : "false";
+  FORWARD_IMPL(PrintBool, val);
 }
 string TextFormat::FieldValuePrinter::PrintInt32(int32 val) const {
-  return SimpleItoa(val);
+  FORWARD_IMPL(PrintInt32, val);
 }
 string TextFormat::FieldValuePrinter::PrintUInt32(uint32 val) const {
-  return SimpleItoa(val);
+  FORWARD_IMPL(PrintUInt32, val);
 }
 string TextFormat::FieldValuePrinter::PrintInt64(int64 val) const {
-  return SimpleItoa(val);
+  FORWARD_IMPL(PrintInt64, val);
 }
 string TextFormat::FieldValuePrinter::PrintUInt64(uint64 val) const {
-  return SimpleItoa(val);
+  FORWARD_IMPL(PrintUInt64, val);
 }
 string TextFormat::FieldValuePrinter::PrintFloat(float val) const {
-  return SimpleFtoa(val);
+  FORWARD_IMPL(PrintFloat, val);
 }
 string TextFormat::FieldValuePrinter::PrintDouble(double val) const {
-  return SimpleDtoa(val);
+  FORWARD_IMPL(PrintDouble, val);
 }
 string TextFormat::FieldValuePrinter::PrintString(const string& val) const {
-  string printed("\"");
-  CEscapeAndAppend(val, &printed);
-  printed.push_back('\"');
-  return printed;
+  FORWARD_IMPL(PrintString, val);
 }
 string TextFormat::FieldValuePrinter::PrintBytes(const string& val) const {
   return PrintString(val);
 }
 string TextFormat::FieldValuePrinter::PrintEnum(int32 val,
                                                 const string& name) const {
-  return name;
+  FORWARD_IMPL(PrintEnum, val, name);
 }
 string TextFormat::FieldValuePrinter::PrintFieldName(
     const Message& message,
     const Reflection* reflection,
     const FieldDescriptor* field) const {
-  if (field->is_extension()) {
-    // We special-case MessageSet elements for compatibility with proto1.
-    if (field->containing_type()->options().message_set_wire_format()
-        && field->type() == FieldDescriptor::TYPE_MESSAGE
-        && field->is_optional()
-        && field->extension_scope() == field->message_type()) {
-      return StrCat("[", field->message_type()->full_name(), "]");
-    } else {
-      return StrCat("[", field->full_name(), "]");
-    }
-  } else if (field->type() == FieldDescriptor::TYPE_GROUP) {
-    // Groups must be serialized with their original capitalization.
-    return field->message_type()->name();
-  } else {
-    return field->name();
-  }
+  FORWARD_IMPL(PrintFieldName, message, reflection, field);
 }
 string TextFormat::FieldValuePrinter::PrintMessageStart(
     const Message& message,
     int field_index,
     int field_count,
     bool single_line_mode) const {
-  return single_line_mode ? " { " : " {\n";
+  FORWARD_IMPL(PrintMessageStart, message, field_index, field_count,
+               single_line_mode);
 }
 string TextFormat::FieldValuePrinter::PrintMessageEnd(
     const Message& message,
     int field_index,
     int field_count,
     bool single_line_mode) const {
-  return single_line_mode ? "} " : "}\n";
+  FORWARD_IMPL(PrintMessageEnd, message, field_index, field_count,
+               single_line_mode);
+}
+#undef FORWARD_IMPL
+
+TextFormat::FastFieldValuePrinter::FastFieldValuePrinter() {}
+TextFormat::FastFieldValuePrinter::~FastFieldValuePrinter() {}
+void TextFormat::FastFieldValuePrinter::PrintBool(
+    bool val, BaseTextGenerator* generator) const {
+  if (val) {
+    generator->PrintLiteral("true");
+  } else {
+    generator->PrintLiteral("false");
+  }
+}
+void TextFormat::FastFieldValuePrinter::PrintInt32(
+    int32 val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleItoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintUInt32(
+    uint32 val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleItoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintInt64(
+    int64 val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleItoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintUInt64(
+    uint64 val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleItoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintFloat(
+    float val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleFtoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintDouble(
+    double val, BaseTextGenerator* generator) const {
+  generator->PrintString(SimpleDtoa(val));
+}
+void TextFormat::FastFieldValuePrinter::PrintEnum(
+    int32 val, const string& name, BaseTextGenerator* generator) const {
+  generator->PrintString(name);
+}
+
+void TextFormat::FastFieldValuePrinter::PrintString(
+    const string& val, BaseTextGenerator* generator) const {
+  generator->PrintLiteral("\"");
+  generator->PrintString(CEscape(val));
+  generator->PrintLiteral("\"");
+}
+void TextFormat::FastFieldValuePrinter::PrintBytes(
+    const string& val, BaseTextGenerator* generator) const {
+  PrintString(val, generator);
+}
+void TextFormat::FastFieldValuePrinter::PrintFieldName(
+    const Message& message, int field_index, int field_count,
+    const Reflection* reflection, const FieldDescriptor* field,
+    BaseTextGenerator* generator) const {
+  PrintFieldName(message, reflection, field, generator);
+}
+void TextFormat::FastFieldValuePrinter::PrintFieldName(
+    const Message& message, const Reflection* reflection,
+    const FieldDescriptor* field, BaseTextGenerator* generator) const {
+  if (field->is_extension()) {
+    generator->PrintLiteral("[");
+    // We special-case MessageSet elements for compatibility with proto1.
+    if (field->containing_type()->options().message_set_wire_format() &&
+        field->type() == FieldDescriptor::TYPE_MESSAGE &&
+        field->is_optional() &&
+        field->extension_scope() == field->message_type()) {
+      generator->PrintString(field->message_type()->full_name());
+    } else {
+      generator->PrintString(field->full_name());
+    }
+    generator->PrintLiteral("]");
+  } else if (field->type() == FieldDescriptor::TYPE_GROUP) {
+    // Groups must be serialized with their original capitalization.
+    generator->PrintString(field->message_type()->name());
+  } else {
+    generator->PrintString(field->name());
+  }
+}
+void TextFormat::FastFieldValuePrinter::PrintMessageStart(
+    const Message& message, int field_index, int field_count,
+    bool single_line_mode, BaseTextGenerator* generator) const {
+  if (single_line_mode) {
+    generator->PrintLiteral(" { ");
+  } else {
+    generator->PrintLiteral(" {\n");
+  }
+}
+void TextFormat::FastFieldValuePrinter::PrintMessageEnd(
+    const Message& message, int field_index, int field_count,
+    bool single_line_mode, BaseTextGenerator* generator) const {
+  if (single_line_mode) {
+    generator->PrintLiteral("} ");
+  } else {
+    generator->PrintLiteral("}\n");
+  }
 }
 
 namespace {
+
+// A legacy compatibility wrapper. Takes ownership of the delegate.
+class FieldValuePrinterWrapper : public TextFormat::FastFieldValuePrinter {
+ public:
+  explicit FieldValuePrinterWrapper(
+      const TextFormat::FieldValuePrinter* delegate)
+      : delegate_(delegate) {}
+
+  void SetDelegate(const TextFormat::FieldValuePrinter* delegate) {
+    delegate_.reset(delegate);
+  }
+
+  void PrintBool(bool val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintBool(val));
+  }
+  void PrintInt32(int32 val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintInt32(val));
+  }
+  void PrintUInt32(uint32 val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintUInt32(val));
+  }
+  void PrintInt64(int64 val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintInt64(val));
+  }
+  void PrintUInt64(uint64 val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintUInt64(val));
+  }
+  void PrintFloat(float val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintFloat(val));
+  }
+  void PrintDouble(double val, TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintDouble(val));
+  }
+  void PrintString(const string& val,
+                   TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintString(val));
+  }
+  void PrintBytes(const string& val,
+                  TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintBytes(val));
+  }
+  void PrintEnum(int32 val, const string& name,
+                 TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintEnum(val, name));
+  }
+  void PrintFieldName(const Message& message, int field_index, int field_count,
+                      const Reflection* reflection,
+                      const FieldDescriptor* field,
+                      TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintFieldName(
+        message, reflection, field));
+  }
+  void PrintFieldName(const Message& message, const Reflection* reflection,
+                      const FieldDescriptor* field,
+                      TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(
+        delegate_->PrintFieldName(message, reflection, field));
+  }
+  void PrintMessageStart(const Message& message, int field_index,
+                         int field_count, bool single_line_mode,
+                         TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintMessageStart(
+        message, field_index, field_count, single_line_mode));
+  }
+  void PrintMessageEnd(const Message& message, int field_index, int field_count,
+                       bool single_line_mode,
+                       TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintString(delegate_->PrintMessageEnd(
+        message, field_index, field_count, single_line_mode));
+  }
+
+ private:
+  std::unique_ptr<const TextFormat::FieldValuePrinter> delegate_;
+};
+
 // Our own specialization: for UTF8 escaped strings.
-class FieldValuePrinterUtf8Escaping : public TextFormat::FieldValuePrinter {
+class FastFieldValuePrinterUtf8Escaping
+    : public TextFormat::FastFieldValuePrinter {
  public:
-  virtual string PrintString(const string& val) const {
-    return StrCat("\"", strings::Utf8SafeCEscape(val), "\"");
+  void PrintString(const string& val,
+                   TextFormat::BaseTextGenerator* generator) const {
+    generator->PrintLiteral("\"");
+    generator->PrintString(strings::Utf8SafeCEscape(val));
+    generator->PrintLiteral("\"");
   }
-  virtual string PrintBytes(const string& val) const {
-    return TextFormat::FieldValuePrinter::PrintString(val);
+  void PrintBytes(const string& val,
+                  TextFormat::BaseTextGenerator* generator) const {
+    return FastFieldValuePrinter::PrintString(val, generator);
   }
 };
 
@@ -1486,32 +1731,61 @@ TextFormat::Printer::Printer()
     hide_unknown_fields_(false),
     print_message_fields_in_index_order_(false),
     expand_any_(false),
-    truncate_string_field_longer_than_(0LL) {
+    truncate_string_field_longer_than_(0LL),
+    finder_(NULL) {
   SetUseUtf8StringEscaping(false);
 }
 
 TextFormat::Printer::~Printer() {
   STLDeleteValues(&custom_printers_);
+  STLDeleteValues(&custom_message_printers_);
 }
 
 void TextFormat::Printer::SetUseUtf8StringEscaping(bool as_utf8) {
-  SetDefaultFieldValuePrinter(as_utf8
-                              ? new FieldValuePrinterUtf8Escaping()
-                              : new FieldValuePrinter());
+  SetDefaultFieldValuePrinter(as_utf8 ? new FastFieldValuePrinterUtf8Escaping()
+                                      : new FastFieldValuePrinter());
 }
 
 void TextFormat::Printer::SetDefaultFieldValuePrinter(
     const FieldValuePrinter* printer) {
+  default_field_value_printer_.reset(new FieldValuePrinterWrapper(printer));
+}
+
+void TextFormat::Printer::SetDefaultFieldValuePrinter(
+    const FastFieldValuePrinter* printer) {
   default_field_value_printer_.reset(printer);
 }
 
 bool TextFormat::Printer::RegisterFieldValuePrinter(
     const FieldDescriptor* field,
     const FieldValuePrinter* printer) {
+  if (field == NULL || printer == NULL) {
+    return false;
+  }
+  FieldValuePrinterWrapper* const wrapper =
+      new FieldValuePrinterWrapper(nullptr);
+  if (custom_printers_.insert(std::make_pair(field, wrapper)).second) {
+    wrapper->SetDelegate(printer);
+    return true;
+  } else {
+    delete wrapper;
+    return false;
+  }
+}
+
+bool TextFormat::Printer::RegisterFieldValuePrinter(
+    const FieldDescriptor* field, const FastFieldValuePrinter* printer) {
   return field != NULL && printer != NULL &&
          custom_printers_.insert(std::make_pair(field, printer)).second;
 }
 
+bool TextFormat::Printer::RegisterMessagePrinter(
+    const Descriptor* descriptor, const MessagePrinter* printer) {
+  return descriptor != nullptr && printer != nullptr &&
+         custom_message_printers_.insert(std::make_pair(descriptor, printer))
+             .second;
+}
+
 bool TextFormat::Printer::PrintToString(const Message& message,
                                         string* output) const {
   GOOGLE_DCHECK(output) << "output specified is NULL";
@@ -1536,7 +1810,7 @@ bool TextFormat::Printer::Print(const Message& message,
                                 io::ZeroCopyOutputStream* output) const {
   TextGenerator generator(output, initial_indent_level_);
 
-  Print(message, generator);
+  Print(message, &generator);
 
   // Output false if the generator failed internally.
   return !generator.failed();
@@ -1547,7 +1821,7 @@ bool TextFormat::Printer::PrintUnknownFields(
     io::ZeroCopyOutputStream* output) const {
   TextGenerator generator(output, initial_indent_level_);
 
-  PrintUnknownFields(unknown_fields, generator);
+  PrintUnknownFields(unknown_fields, &generator);
 
   // Output false if the generator failed internally.
   return !generator.failed();
@@ -1555,17 +1829,26 @@ bool TextFormat::Printer::PrintUnknownFields(
 
 namespace {
 // Comparison functor for sorting FieldDescriptors by field index.
+// Normal fields have higher precedence than extensions.
 struct FieldIndexSorter {
   bool operator()(const FieldDescriptor* left,
                   const FieldDescriptor* right) const {
-    return left->index() < right->index();
+    if (left->is_extension() && right->is_extension()) {
+      return left->number() < right->number();
+    } else if (left->is_extension()) {
+      return false;
+    } else if (right->is_extension()) {
+      return true;
+    } else {
+      return left->index() < right->index();
+    }
   }
 };
 
 }  // namespace
 
 bool TextFormat::Printer::PrintAny(const Message& message,
-                                   TextGenerator& generator) const {
+                                   TextGenerator* generator) const {
   const FieldDescriptor* type_url_field;
   const FieldDescriptor* value_field;
   if (!internal::GetAnyFieldDescriptors(message, &type_url_field,
@@ -1577,42 +1860,49 @@ bool TextFormat::Printer::PrintAny(const Message& message,
 
   // Extract the full type name from the type_url field.
   const string& type_url = reflection->GetString(message, type_url_field);
+  string url_prefix;
   string full_type_name;
-  if (!internal::ParseAnyTypeUrl(type_url, &full_type_name)) {
+  if (!internal::ParseAnyTypeUrl(type_url, &url_prefix, &full_type_name)) {
     return false;
   }
 
   // Print the "value" in text.
   const google::protobuf::Descriptor* value_descriptor =
-      message.GetDescriptor()->file()->pool()->FindMessageTypeByName(
-          full_type_name);
+      finder_ ? finder_->FindAnyType(message, url_prefix, full_type_name)
+              : DefaultFinderFindAnyType(message, url_prefix, full_type_name);
   if (value_descriptor == NULL) {
     GOOGLE_LOG(WARNING) << "Proto type " << type_url << " not found";
     return false;
   }
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<google::protobuf::Message> value_message(
+  std::unique_ptr<google::protobuf::Message> value_message(
       factory.GetPrototype(value_descriptor)->New());
   string serialized_value = reflection->GetString(message, value_field);
   if (!value_message->ParseFromString(serialized_value)) {
     GOOGLE_LOG(WARNING) << type_url << ": failed to parse contents";
     return false;
   }
-  generator.Print(StrCat("[", type_url, "]"));
-  const FieldValuePrinter* printer = FindWithDefault(
+  generator->PrintLiteral("[");
+  generator->PrintString(type_url);
+  generator->PrintLiteral("]");
+  const FastFieldValuePrinter* printer = FindWithDefault(
       custom_printers_, value_field, default_field_value_printer_.get());
-  generator.Print(
-      printer->PrintMessageStart(message, -1, 0, single_line_mode_));
-  generator.Indent();
+  printer->PrintMessageStart(message, -1, 0, single_line_mode_, generator);
+  generator->Indent();
   Print(*value_message, generator);
-  generator.Outdent();
-  generator.Print(printer->PrintMessageEnd(message, -1, 0, single_line_mode_));
+  generator->Outdent();
+  printer->PrintMessageEnd(message, -1, 0, single_line_mode_, generator);
   return true;
 }
 
 void TextFormat::Printer::Print(const Message& message,
-                                TextGenerator& generator) const {
+                                TextGenerator* generator) const {
   const Descriptor* descriptor = message.GetDescriptor();
+  auto itr = custom_message_printers_.find(descriptor);
+  if (itr != custom_message_printers_.end()) {
+    itr->second->Print(message, single_line_mode_, generator);
+    return;
+  }
   const Reflection* reflection = message.GetReflection();
   if (descriptor->full_name() == internal::kAnyFullTypeName && expand_any_ &&
       PrintAny(message, generator)) {
@@ -1636,20 +1926,19 @@ void TextFormat::Printer::PrintFieldValueToString(
     const FieldDescriptor* field,
     int index,
     string* output) const {
-
   GOOGLE_DCHECK(output) << "output specified is NULL";
 
   output->clear();
   io::StringOutputStream output_stream(output);
   TextGenerator generator(&output_stream, initial_indent_level_);
 
-  PrintFieldValue(message, message.GetReflection(), field, index, generator);
+  PrintFieldValue(message, message.GetReflection(), field, index, &generator);
 }
 
 void TextFormat::Printer::PrintField(const Message& message,
                                      const Reflection* reflection,
                                      const FieldDescriptor* field,
-                                     TextGenerator& generator) const {
+                                     TextGenerator* generator) const {
   if (use_short_repeated_primitives_ &&
       field->is_repeated() &&
       field->cpp_type() != FieldDescriptor::CPPTYPE_STRING &&
@@ -1675,95 +1964,93 @@ void TextFormat::Printer::PrintField(const Message& message,
   for (int j = 0; j < count; ++j) {
     const int field_index = field->is_repeated() ? j : -1;
 
-    PrintFieldName(message, reflection, field, generator);
+    PrintFieldName(message, field_index, count, reflection, field, generator);
 
     if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
-      const FieldValuePrinter* printer = FindWithDefault(
+      const FastFieldValuePrinter* printer = FindWithDefault(
           custom_printers_, field, default_field_value_printer_.get());
       const Message& sub_message =
           field->is_repeated()
               ? (is_map ? *map_entries[j]
                         : reflection->GetRepeatedMessage(message, field, j))
               : reflection->GetMessage(message, field);
-      generator.Print(
-          printer->PrintMessageStart(
-              sub_message, field_index, count, single_line_mode_));
-      generator.Indent();
+      printer->PrintMessageStart(sub_message, field_index, count,
+                                 single_line_mode_, generator);
+      generator->Indent();
       Print(sub_message, generator);
-      generator.Outdent();
-      generator.Print(
-          printer->PrintMessageEnd(
-              sub_message, field_index, count, single_line_mode_));
+      generator->Outdent();
+      printer->PrintMessageEnd(sub_message, field_index, count,
+                               single_line_mode_, generator);
     } else {
-      generator.Print(": ");
+      generator->PrintLiteral(": ");
       // Write the field value.
       PrintFieldValue(message, reflection, field, field_index, generator);
       if (single_line_mode_) {
-        generator.Print(" ");
+        generator->PrintLiteral(" ");
       } else {
-        generator.Print("\n");
+        generator->PrintLiteral("\n");
       }
     }
   }
 }
 
 void TextFormat::Printer::PrintShortRepeatedField(
-    const Message& message,
-    const Reflection* reflection,
-    const FieldDescriptor* field,
-    TextGenerator& generator) const {
+    const Message& message, const Reflection* reflection,
+    const FieldDescriptor* field, TextGenerator* generator) const {
   // Print primitive repeated field in short form.
-  PrintFieldName(message, reflection, field, generator);
-
   int size = reflection->FieldSize(message, field);
-  generator.Print(": [");
+  PrintFieldName(message, /*field_index=*/-1, /*field_count=*/size, reflection,
+                 field, generator);
+  generator->PrintLiteral(": [");
   for (int i = 0; i < size; i++) {
-    if (i > 0) generator.Print(", ");
+    if (i > 0) generator->PrintLiteral(", ");
     PrintFieldValue(message, reflection, field, i, generator);
   }
   if (single_line_mode_) {
-    generator.Print("] ");
+    generator->PrintLiteral("] ");
   } else {
-    generator.Print("]\n");
+    generator->PrintLiteral("]\n");
   }
 }
 
 void TextFormat::Printer::PrintFieldName(const Message& message,
+                                         int field_index, int field_count,
                                          const Reflection* reflection,
                                          const FieldDescriptor* field,
-                                         TextGenerator& generator) const {
+                                         TextGenerator* generator) const {
   // if use_field_number_ is true, prints field number instead
   // of field name.
   if (use_field_number_) {
-    generator.Print(SimpleItoa(field->number()));
+    generator->PrintString(SimpleItoa(field->number()));
     return;
   }
 
-  const FieldValuePrinter* printer = FindWithDefault(
+  const FastFieldValuePrinter* printer = FindWithDefault(
       custom_printers_, field, default_field_value_printer_.get());
-  generator.Print(printer->PrintFieldName(message, reflection, field));
+  printer->PrintFieldName(message, field_index, field_count, reflection, field,
+                          generator);
 }
 
-void TextFormat::Printer::PrintFieldValue(
-    const Message& message,
-    const Reflection* reflection,
-    const FieldDescriptor* field,
-    int index,
-    TextGenerator& generator) const {
+void TextFormat::Printer::PrintFieldValue(const Message& message,
+                                          const Reflection* reflection,
+                                          const FieldDescriptor* field,
+                                          int index,
+                                          TextGenerator* generator) const {
   GOOGLE_DCHECK(field->is_repeated() || (index == -1))
       << "Index must be -1 for non-repeated fields";
 
-  const FieldValuePrinter* printer
-      = FindWithDefault(custom_printers_, field,
-                        default_field_value_printer_.get());
+  const FastFieldValuePrinter* printer = FindWithDefault(
+      custom_printers_, field, default_field_value_printer_.get());
 
   switch (field->cpp_type()) {
-#define OUTPUT_FIELD(CPPTYPE, METHOD)                                   \
-    case FieldDescriptor::CPPTYPE_##CPPTYPE:                            \
-      generator.Print(printer->Print##METHOD(field->is_repeated()       \
-               ? reflection->GetRepeated##METHOD(message, field, index) \
-               : reflection->Get##METHOD(message, field)));             \
-        break
+#define OUTPUT_FIELD(CPPTYPE, METHOD)                                \
+  case FieldDescriptor::CPPTYPE_##CPPTYPE:                           \
+    printer->Print##METHOD(                                          \
+        field->is_repeated()                                         \
+            ? reflection->GetRepeated##METHOD(message, field, index) \
+            : reflection->Get##METHOD(message, field),               \
+        generator);                                                  \
+    break
 
     OUTPUT_FIELD( INT32,  Int32);
     OUTPUT_FIELD( INT64,  Int64);
@@ -1789,10 +2076,10 @@ void TextFormat::Printer::PrintFieldValue(
         value_to_print = &truncated_value;
       }
       if (field->type() == FieldDescriptor::TYPE_STRING) {
-        generator.Print(printer->PrintString(*value_to_print));
+        printer->PrintString(*value_to_print, generator);
       } else {
         GOOGLE_DCHECK_EQ(field->type(), FieldDescriptor::TYPE_BYTES);
-        generator.Print(printer->PrintBytes(*value_to_print));
+        printer->PrintBytes(*value_to_print, generator);
       }
       break;
     }
@@ -1804,7 +2091,7 @@ void TextFormat::Printer::PrintFieldValue(
       const EnumValueDescriptor* enum_desc =
           field->enum_type()->FindValueByNumber(enum_value);
       if (enum_desc != NULL) {
-        generator.Print(printer->PrintEnum(enum_value, enum_desc->name()));
+        printer->PrintEnum(enum_value, enum_desc->name(), generator);
       } else {
         // Ordinarily, enum_desc should not be null, because proto2 has the
         // invariant that set enum field values must be in-range, but with the
@@ -1812,8 +2099,8 @@ void TextFormat::Printer::PrintFieldValue(
         // it is possible for the user to force an unknown integer value.  So we
         // simply use the integer value itself as the enum value name in this
         // case.
-        generator.Print(printer->PrintEnum(enum_value,
-                                           StringPrintf("%d", enum_value)));
+        printer->PrintEnum(enum_value, StringPrintf("%d", enum_value),
+                           generator);
       }
       break;
     }
@@ -1876,90 +2163,93 @@ static string PaddedHex(IntType value) {
 }
 
 void TextFormat::Printer::PrintUnknownFields(
-    const UnknownFieldSet& unknown_fields, TextGenerator& generator) const {
+    const UnknownFieldSet& unknown_fields, TextGenerator* generator) const {
   for (int i = 0; i < unknown_fields.field_count(); i++) {
     const UnknownField& field = unknown_fields.field(i);
     string field_number = SimpleItoa(field.number());
 
     switch (field.type()) {
       case UnknownField::TYPE_VARINT:
-        generator.Print(field_number);
-        generator.Print(": ");
-        generator.Print(SimpleItoa(field.varint()));
+        generator->PrintString(field_number);
+        generator->PrintLiteral(": ");
+        generator->PrintString(SimpleItoa(field.varint()));
         if (single_line_mode_) {
-          generator.Print(" ");
+          generator->PrintLiteral(" ");
         } else {
-          generator.Print("\n");
+          generator->PrintLiteral("\n");
         }
         break;
       case UnknownField::TYPE_FIXED32: {
-        generator.Print(field_number);
-        generator.Print(": 0x");
-        generator.Print(
+        generator->PrintString(field_number);
+        generator->PrintLiteral(": 0x");
+        generator->PrintString(
             StrCat(strings::Hex(field.fixed32(), strings::ZERO_PAD_8)));
         if (single_line_mode_) {
-          generator.Print(" ");
+          generator->PrintLiteral(" ");
         } else {
-          generator.Print("\n");
+          generator->PrintLiteral("\n");
         }
         break;
       }
       case UnknownField::TYPE_FIXED64: {
-        generator.Print(field_number);
-        generator.Print(": 0x");
-        generator.Print(
+        generator->PrintString(field_number);
+        generator->PrintLiteral(": 0x");
+        generator->PrintString(
             StrCat(strings::Hex(field.fixed64(), strings::ZERO_PAD_16)));
         if (single_line_mode_) {
-          generator.Print(" ");
+          generator->PrintLiteral(" ");
         } else {
-          generator.Print("\n");
+          generator->PrintLiteral("\n");
         }
         break;
       }
       case UnknownField::TYPE_LENGTH_DELIMITED: {
-        generator.Print(field_number);
+        generator->PrintString(field_number);
         const string& value = field.length_delimited();
         UnknownFieldSet embedded_unknown_fields;
         if (!value.empty() && embedded_unknown_fields.ParseFromString(value)) {
           // This field is parseable as a Message.
           // So it is probably an embedded message.
           if (single_line_mode_) {
-            generator.Print(" { ");
+            generator->PrintLiteral(" { ");
           } else {
-            generator.Print(" {\n");
-            generator.Indent();
+            generator->PrintLiteral(" {\n");
+            generator->Indent();
           }
           PrintUnknownFields(embedded_unknown_fields, generator);
           if (single_line_mode_) {
-            generator.Print("} ");
+            generator->PrintLiteral("} ");
           } else {
-            generator.Outdent();
-            generator.Print("}\n");
+            generator->Outdent();
+            generator->PrintLiteral("}\n");
           }
         } else {
           // This field is not parseable as a Message.
           // So it is probably just a plain string.
-          string printed(": \"");
-          CEscapeAndAppend(value, &printed);
-          printed.append(single_line_mode_ ? "\" " : "\"\n");
-          generator.Print(printed);
+          generator->PrintLiteral(": \"");
+          generator->PrintString(CEscape(value));
+          if (single_line_mode_) {
+            generator->PrintLiteral("\" ");
+          } else {
+            generator->PrintLiteral("\"\n");
+          }
         }
         break;
       }
       case UnknownField::TYPE_GROUP:
-        generator.Print(field_number);
+        generator->PrintString(field_number);
         if (single_line_mode_) {
-          generator.Print(" { ");
+          generator->PrintLiteral(" { ");
         } else {
-          generator.Print(" {\n");
-          generator.Indent();
+          generator->PrintLiteral(" {\n");
+          generator->Indent();
         }
         PrintUnknownFields(field.group(), generator);
         if (single_line_mode_) {
-          generator.Print("} ");
+          generator->PrintLiteral("} ");
         } else {
-          generator.Outdent();
-          generator.Print("}\n");
+          generator->Outdent();
+          generator->PrintLiteral("}\n");
         }
         break;
     }
diff --git a/src/google/protobuf/text_format.h b/src/google/protobuf/text_format.h
index 2873d339..d6f3e16b 100644
--- a/src/google/protobuf/text_format.h
+++ b/src/google/protobuf/text_format.h
@@ -40,15 +40,13 @@
 
 #include <map>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
+#include <google/protobuf/message_lite.h>
 
 namespace google {
 namespace protobuf {
@@ -65,21 +63,22 @@ namespace io {
 class LIBPROTOBUF_EXPORT TextFormat {
  public:
   // Outputs a textual representation of the given message to the given
-  // output stream.
+  // output stream. Returns false if printing fails.
   static bool Print(const Message& message, io::ZeroCopyOutputStream* output);
 
   // Print the fields in an UnknownFieldSet.  They are printed by tag number
   // only.  Embedded messages are heuristically identified by attempting to
-  // parse them.
+  // parse them. Returns false if printing fails.
   static bool PrintUnknownFields(const UnknownFieldSet& unknown_fields,
                                  io::ZeroCopyOutputStream* output);
 
   // Like Print(), but outputs directly to a string.
-  // Note: output will be cleared before prior to printing, and will
-  // be left empty even if printing fails.
+  // Note: output will be cleared prior to printing, and will be left empty
+  // even if printing fails. Returns false if printing fails.
   static bool PrintToString(const Message& message, string* output);
 
-  // Like PrintUnknownFields(), but outputs directly to a string.
+  // Like PrintUnknownFields(), but outputs directly to a string. Returns false
+  // if printing fails.
   static bool PrintUnknownFieldsToString(const UnknownFieldSet& unknown_fields,
                                          string* output);
 
@@ -92,12 +91,66 @@ class LIBPROTOBUF_EXPORT TextFormat {
                                       int index,
                                       string* output);
 
-  // The default printer that converts scalar values from fields into
-  // their string representation.
-  // You can derive from this FieldValuePrinter if you want to have
-  // fields to be printed in a different way and register it at the
-  // Printer.
-  class LIBPROTOBUF_EXPORT FieldValuePrinter {
+  class LIBPROTOBUF_EXPORT BaseTextGenerator {
+   public:
+    virtual ~BaseTextGenerator();
+
+    virtual void Indent() {}
+    virtual void Outdent() {}
+
+    // Print text to the output stream.
+    virtual void Print(const char* text, size_t size) = 0;
+
+    void PrintString(const string& str) { Print(str.data(), str.size()); }
+
+    template <size_t n>
+    void PrintLiteral(const char (&text)[n]) {
+      Print(text, n - 1);  // n includes the terminating zero character.
+    }
+  };
+
+  // The default printer that converts scalar values from fields into their
+  // string representation.
+  // You can derive from this FastFieldValuePrinter if you want to have fields
+  // to be printed in a different way and register it at the Printer.
+  class LIBPROTOBUF_EXPORT FastFieldValuePrinter {
+   public:
+    FastFieldValuePrinter();
+    virtual ~FastFieldValuePrinter();
+    virtual void PrintBool(bool val, BaseTextGenerator* generator) const;
+    virtual void PrintInt32(int32 val, BaseTextGenerator* generator) const;
+    virtual void PrintUInt32(uint32 val, BaseTextGenerator* generator) const;
+    virtual void PrintInt64(int64 val, BaseTextGenerator* generator) const;
+    virtual void PrintUInt64(uint64 val, BaseTextGenerator* generator) const;
+    virtual void PrintFloat(float val, BaseTextGenerator* generator) const;
+    virtual void PrintDouble(double val, BaseTextGenerator* generator) const;
+    virtual void PrintString(const string& val,
+                             BaseTextGenerator* generator) const;
+    virtual void PrintBytes(const string& val,
+                            BaseTextGenerator* generator) const;
+    virtual void PrintEnum(int32 val, const string& name,
+                           BaseTextGenerator* generator) const;
+    virtual void PrintFieldName(const Message& message, int field_index,
+                                int field_count, const Reflection* reflection,
+                                const FieldDescriptor* field,
+                                BaseTextGenerator* generator) const;
+    virtual void PrintFieldName(const Message& message,
+                                const Reflection* reflection,
+                                const FieldDescriptor* field,
+                                BaseTextGenerator* generator) const;
+    virtual void PrintMessageStart(const Message& message, int field_index,
+                                   int field_count, bool single_line_mode,
+                                   BaseTextGenerator* generator) const;
+    virtual void PrintMessageEnd(const Message& message, int field_index,
+                                 int field_count, bool single_line_mode,
+                                 BaseTextGenerator* generator) const;
+
+   private:
+    GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FastFieldValuePrinter);
+  };
+
+  class LIBPROTOBUF_EXPORT PROTOBUF_RUNTIME_DEPRECATED("Please use FastFieldValuePrinter")
+      FieldValuePrinter {
    public:
     FieldValuePrinter();
     virtual ~FieldValuePrinter();
@@ -124,9 +177,44 @@ class LIBPROTOBUF_EXPORT TextFormat {
                                    bool single_line_mode) const;
 
    private:
+    FastFieldValuePrinter delegate_;
     GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldValuePrinter);
   };
 
+  class LIBPROTOBUF_EXPORT MessagePrinter {
+   public:
+    MessagePrinter() {}
+    virtual ~MessagePrinter() {}
+    virtual void Print(const Message& message, bool single_line_mode,
+                       BaseTextGenerator* generator) const = 0;
+
+   private:
+    GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessagePrinter);
+  };
+
+  // Interface that Printers or Parsers can use to find extensions, or types
+  // referenced in Any messages.
+  class LIBPROTOBUF_EXPORT Finder {
+   public:
+    virtual ~Finder();
+
+    // Try to find an extension of *message by fully-qualified field
+    // name.  Returns NULL if no extension is known for this name or number.
+    // The base implementation uses the extensions already known by the message.
+    virtual const FieldDescriptor* FindExtension(
+        Message* message,
+        const string& name) const;
+
+    // Find the message type for an Any proto.
+    // Returns NULL if no message is known for this name.
+    // The base implementation only accepts prefixes of type.googleprod.com/ or
+    // type.googleapis.com/, and searches the DescriptorPool of the parent
+    // message.
+    virtual const Descriptor* FindAnyType(const Message& message,
+                                          const string& prefix,
+                                          const string& name) const;
+  };
+
   // Class for those users which require more fine-grained control over how
   // a protobuffer message is printed out.
   class LIBPROTOBUF_EXPORT Printer {
@@ -162,7 +250,7 @@ class LIBPROTOBUF_EXPORT TextFormat {
       single_line_mode_ = single_line_mode;
     }
 
-    bool IsInSingleLineMode() {
+    bool IsInSingleLineMode() const {
       return single_line_mode_;
     }
 
@@ -183,12 +271,13 @@ class LIBPROTOBUF_EXPORT TextFormat {
     // Set true to output UTF-8 instead of ASCII.  The only difference
     // is that bytes >= 0x80 in string fields will not be escaped,
     // because they are assumed to be part of UTF-8 multi-byte
-    // sequences. This will change the default FieldValuePrinter.
+    // sequences. This will change the default FastFieldValuePrinter.
     void SetUseUtf8StringEscaping(bool as_utf8);
 
-    // Set the default FieldValuePrinter that is used for all fields that
+    // Set the default (Fast)FieldValuePrinter that is used for all fields that
     // don't have a field-specific printer registered.
     // Takes ownership of the printer.
+    void SetDefaultFieldValuePrinter(const FastFieldValuePrinter* printer);
     void SetDefaultFieldValuePrinter(const FieldValuePrinter* printer);
 
     // Sets whether we want to hide unknown fields or not.
@@ -201,9 +290,11 @@ class LIBPROTOBUF_EXPORT TextFormat {
       hide_unknown_fields_ = hide;
     }
 
-    // If print_message_fields_in_index_order is true, print fields of a proto
-    // message using the order defined in source code instead of the field
-    // number. By default, use the field number order.
+    // If print_message_fields_in_index_order is true, fields of a proto message
+    // will be printed using the order defined in source code instead of the
+    // field number, extensions will be printed at the end of the message
+    // and their relative order is determined by the extension number.
+    // By default, use the field number order.
     void SetPrintMessageFieldsInIndexOrder(
         bool print_message_fields_in_index_order) {
       print_message_fields_in_index_order_ =
@@ -221,6 +312,11 @@ class LIBPROTOBUF_EXPORT TextFormat {
       expand_any_ = expand;
     }
 
+    // Set how parser finds message for Any payloads.
+    void SetFinder(Finder* finder) {
+      finder_ = finder;
+    }
+
     // If non-zero, we truncate all string fields that are  longer than this
     // threshold.  This is useful when the proto message has very long strings,
     // e.g., dump of encoded image file.
@@ -233,13 +329,22 @@ class LIBPROTOBUF_EXPORT TextFormat {
       truncate_string_field_longer_than_ = truncate_string_field_longer_than;
     }
 
-    // Register a custom field-specific FieldValuePrinter for fields
+    // Register a custom field-specific (Fast)FieldValuePrinter for fields
     // with a particular FieldDescriptor.
     // Returns "true" if the registration succeeded, or "false", if there is
     // already a printer for that FieldDescriptor.
     // Takes ownership of the printer on successful registration.
     bool RegisterFieldValuePrinter(const FieldDescriptor* field,
                                    const FieldValuePrinter* printer);
+    bool RegisterFieldValuePrinter(const FieldDescriptor* field,
+                                   const FastFieldValuePrinter* printer);
+
+    // Register a custom message-specific MessagePrinter for messages with a
+    // particular Descriptor.
+    // Returns "true" if the registration succeeded, or "false" if there is
+    // already a printer for that Descriptor.
+    bool RegisterMessagePrinter(const Descriptor* descriptor,
+                                const MessagePrinter* printer);
 
    private:
     // Forward declaration of an internal class used to print the text
@@ -248,43 +353,39 @@ class LIBPROTOBUF_EXPORT TextFormat {
 
     // Internal Print method, used for writing to the OutputStream via
     // the TextGenerator class.
-    void Print(const Message& message,
-               TextGenerator& generator) const;
+    void Print(const Message& message, TextGenerator* generator) const;
 
     // Print a single field.
-    void PrintField(const Message& message,
-                    const Reflection* reflection,
+    void PrintField(const Message& message, const Reflection* reflection,
                     const FieldDescriptor* field,
-                    TextGenerator& generator) const;
+                    TextGenerator* generator) const;
 
     // Print a repeated primitive field in short form.
     void PrintShortRepeatedField(const Message& message,
                                  const Reflection* reflection,
                                  const FieldDescriptor* field,
-                                 TextGenerator& generator) const;
+                                 TextGenerator* generator) const;
 
     // Print the name of a field -- i.e. everything that comes before the
     // ':' for a single name/value pair.
-    void PrintFieldName(const Message& message,
-                        const Reflection* reflection,
+    void PrintFieldName(const Message& message, int field_index,
+                        int field_count, const Reflection* reflection,
                         const FieldDescriptor* field,
-                        TextGenerator& generator) const;
+                        TextGenerator* generator) const;
 
     // Outputs a textual representation of the value of the field supplied on
     // the message supplied or the default value if not set.
-    void PrintFieldValue(const Message& message,
-                         const Reflection* reflection,
-                         const FieldDescriptor* field,
-                         int index,
-                         TextGenerator& generator) const;
+    void PrintFieldValue(const Message& message, const Reflection* reflection,
+                         const FieldDescriptor* field, int index,
+                         TextGenerator* generator) const;
 
     // Print the fields in an UnknownFieldSet.  They are printed by tag number
     // only.  Embedded messages are heuristically identified by attempting to
     // parse them.
     void PrintUnknownFields(const UnknownFieldSet& unknown_fields,
-                            TextGenerator& generator) const;
+                            TextGenerator* generator) const;
 
-    bool PrintAny(const Message& message, TextGenerator& generator) const;
+    bool PrintAny(const Message& message, TextGenerator* generator) const;
 
     int initial_indent_level_;
 
@@ -302,10 +403,16 @@ class LIBPROTOBUF_EXPORT TextFormat {
 
     int64 truncate_string_field_longer_than_;
 
-    google::protobuf::scoped_ptr<const FieldValuePrinter> default_field_value_printer_;
-    typedef std::map<const FieldDescriptor*,
-                     const FieldValuePrinter*> CustomPrinterMap;
+    std::unique_ptr<const FastFieldValuePrinter> default_field_value_printer_;
+    typedef std::map<const FieldDescriptor*, const FastFieldValuePrinter*>
+        CustomPrinterMap;
     CustomPrinterMap custom_printers_;
+
+    typedef std::map<const Descriptor*, const MessagePrinter*>
+        CustomMessagePrinterMap;
+    CustomMessagePrinterMap custom_message_printers_;
+
+    const Finder* finder_;
   };
 
   // Parses a text-format protocol message from the given input stream to
@@ -340,20 +447,6 @@ class LIBPROTOBUF_EXPORT TextFormat {
                                         const FieldDescriptor* field,
                                         Message* message);
 
-  // Interface that TextFormat::Parser can use to find extensions.
-  // This class may be extended in the future to find more information
-  // like fields, etc.
-  class LIBPROTOBUF_EXPORT Finder {
-   public:
-    virtual ~Finder();
-
-    // Try to find an extension of *message by fully-qualified field
-    // name.  Returns NULL if no extension is known for this name or number.
-    virtual const FieldDescriptor* FindExtension(
-        Message* message,
-        const string& name) const = 0;
-  };
-
   // A location in the parsed text.
   struct ParseLocation {
     int line;
@@ -477,7 +570,7 @@ class LIBPROTOBUF_EXPORT TextFormat {
                         ParserImpl* parser_impl);
 
     io::ErrorCollector* error_collector_;
-    Finder* finder_;
+    const Finder* finder_;
     ParseInfoTree* parse_info_tree_;
     bool allow_partial_;
     bool allow_case_insensitive_field_;
diff --git a/src/google/protobuf/text_format_unittest.cc b/src/google/protobuf/text_format_unittest.cc
index e6441339..544c37e2 100644
--- a/src/google/protobuf/text_format_unittest.cc
+++ b/src/google/protobuf/text_format_unittest.cc
@@ -38,9 +38,6 @@
 #include <stdlib.h>
 #include <limits>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -53,11 +50,12 @@
 #include <google/protobuf/unittest_mset_wire_format.pb.h>
 #include <google/protobuf/io/tokenizer.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
-#include <google/protobuf/stubs/mathlimits.h>
+
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/substitute.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
+#include <google/protobuf/stubs/mathlimits.h>
 
 
 namespace google {
@@ -454,17 +452,33 @@ TEST_F(TextFormatTest, FieldSpecificCustomPrinter) {
   EXPECT_EQ("optional_int32: value-is(42)\nrepeated_int32: 42\n", text);
 }
 
+TEST_F(TextFormatTest, FieldSpecificCustomPrinterRegisterSameFieldTwice) {
+  protobuf_unittest::TestAllTypes message;
+  TextFormat::Printer printer;
+  const FieldDescriptor* const field =
+      message.GetDescriptor()->FindFieldByName("optional_int32");
+  ASSERT_TRUE(printer.RegisterFieldValuePrinter(
+      field, new CustomInt32FieldValuePrinter()));
+  const TextFormat::FieldValuePrinter* const rejected =
+      new CustomInt32FieldValuePrinter();
+  ASSERT_FALSE(printer.RegisterFieldValuePrinter(field, rejected));
+  delete rejected;
+}
+
 TEST_F(TextFormatTest, ErrorCasesRegisteringFieldValuePrinterShouldFail) {
   protobuf_unittest::TestAllTypes message;
   TextFormat::Printer printer;
   // NULL printer.
   EXPECT_FALSE(printer.RegisterFieldValuePrinter(
       message.GetDescriptor()->FindFieldByName("optional_int32"),
-      NULL));
+      static_cast<const TextFormat::FieldValuePrinter*>(nullptr)));
+  EXPECT_FALSE(printer.RegisterFieldValuePrinter(
+      message.GetDescriptor()->FindFieldByName("optional_int32"),
+      static_cast<const TextFormat::FastFieldValuePrinter*>(nullptr)));
   // Because registration fails, the ownership of this printer is never taken.
   TextFormat::FieldValuePrinter my_field_printer;
   // NULL field
-  EXPECT_FALSE(printer.RegisterFieldValuePrinter(NULL, &my_field_printer));
+  EXPECT_FALSE(printer.RegisterFieldValuePrinter(nullptr, &my_field_printer));
 }
 
 class CustomMessageFieldValuePrinter : public TextFormat::FieldValuePrinter {
@@ -547,6 +561,143 @@ TEST_F(TextFormatTest, CustomPrinterForMultilineComments) {
       text);
 }
 
+// Achieve effects similar to SetUseShortRepeatedPrimitives for messages, using
+// RegisterFieldValuePrinter. Use this to test the version of PrintFieldName
+// that accepts repeated field index and count.
+class CompactRepeatedFieldPrinter : public TextFormat::FastFieldValuePrinter {
+ public:
+  void PrintFieldName(const Message& message, int field_index, int field_count,
+                      const Reflection* reflection,
+                      const FieldDescriptor* field,
+                      TextFormat::BaseTextGenerator* generator) const override {
+    if (field_index == 0 || field_index == -1) {
+      generator->PrintString(field->name());
+    }
+  }
+  void PrintMessageStart(
+      const Message& message, int field_index, int field_count,
+      bool single_line_mode,
+      TextFormat::BaseTextGenerator* generator) const override {
+    if (field_index == 0 || field_index == -1) {
+      if (single_line_mode) {
+        generator->PrintLiteral(" { ");
+      } else {
+        generator->PrintLiteral(" {\n");
+      }
+    }
+  }
+  void PrintMessageEnd(
+      const Message& message, int field_index, int field_count,
+      bool single_line_mode,
+      TextFormat::BaseTextGenerator* generator) const override {
+    if (field_index == field_count - 1 || field_index == -1) {
+      if (single_line_mode) {
+        generator->PrintLiteral("} ");
+      } else {
+        generator->PrintLiteral("}\n");
+      }
+    }
+  }
+};
+
+TEST_F(TextFormatTest, CompactRepeatedFieldPrinter) {
+  TextFormat::Printer printer;
+  ASSERT_TRUE(printer.RegisterFieldValuePrinter(
+      unittest::TestAllTypes::default_instance()
+          .descriptor()
+          ->FindFieldByNumber(
+              unittest::TestAllTypes::kRepeatedNestedMessageFieldNumber),
+      new CompactRepeatedFieldPrinter));
+
+  protobuf_unittest::TestAllTypes message;
+  message.add_repeated_nested_message()->set_bb(1);
+  message.add_repeated_nested_message()->set_bb(2);
+  message.add_repeated_nested_message()->set_bb(3);
+
+  string text;
+  ASSERT_TRUE(printer.PrintToString(message, &text));
+  EXPECT_EQ(
+      "repeated_nested_message {\n"
+      "  bb: 1\n"
+      "  bb: 2\n"
+      "  bb: 3\n"
+      "}\n",
+      text);
+}
+
+// Print strings into multiple line, with indention. Use this to test
+// BaseTextGenerator::Indent and BaseTextGenerator::Outdent.
+class MultilineStringPrinter : public TextFormat::FastFieldValuePrinter {
+ public:
+  void PrintString(const string& val,
+                   TextFormat::BaseTextGenerator* generator) const override {
+    generator->Indent();
+    int last_pos = 0;
+    int newline_pos = val.find('\n');
+    while (newline_pos != string::npos) {
+      generator->PrintLiteral("\n");
+      TextFormat::FastFieldValuePrinter::PrintString(
+          val.substr(last_pos, newline_pos + 1 - last_pos), generator);
+      last_pos = newline_pos + 1;
+      newline_pos = val.find('\n', last_pos);
+    }
+    if (last_pos < val.size()) {
+      generator->PrintLiteral("\n");
+      TextFormat::FastFieldValuePrinter::PrintString(val.substr(last_pos),
+                                                     generator);
+    }
+    generator->Outdent();
+  }
+};
+
+TEST_F(TextFormatTest, MultilineStringPrinter) {
+  TextFormat::Printer printer;
+  ASSERT_TRUE(printer.RegisterFieldValuePrinter(
+      unittest::TestAllTypes::default_instance()
+          .descriptor()
+          ->FindFieldByNumber(
+              unittest::TestAllTypes::kOptionalStringFieldNumber),
+      new MultilineStringPrinter));
+
+  protobuf_unittest::TestAllTypes message;
+  message.set_optional_string("first line\nsecond line\nthird line");
+
+  string text;
+  ASSERT_TRUE(printer.PrintToString(message, &text));
+  EXPECT_EQ(
+      "optional_string: \n"
+      "  \"first line\\n\"\n"
+      "  \"second line\\n\"\n"
+      "  \"third line\"\n",
+      text);
+}
+
+class CustomNestedMessagePrinter : public TextFormat::MessagePrinter {
+ public:
+  CustomNestedMessagePrinter() {}
+  ~CustomNestedMessagePrinter() override {}
+  void Print(const Message& message, bool single_line_mode,
+             TextFormat::BaseTextGenerator* generator) const override {
+    generator->PrintLiteral("custom");
+  }
+};
+
+TEST_F(TextFormatTest, CustomMessagePrinter) {
+  TextFormat::Printer printer;
+  printer.RegisterMessagePrinter(
+      unittest::TestAllTypes::NestedMessage::default_instance().descriptor(),
+      new CustomNestedMessagePrinter);
+
+  unittest::TestAllTypes message;
+  string text;
+  EXPECT_TRUE(printer.PrintToString(message, &text));
+  EXPECT_EQ("", text);
+
+  message.mutable_optional_nested_message()->set_bb(1);
+  EXPECT_TRUE(printer.PrintToString(message, &text));
+  EXPECT_EQ("optional_nested_message {\n  custom}\n", text);
+}
+
 TEST_F(TextFormatTest, ParseBasic) {
   io::ArrayInputStream input_stream(proto_debug_string_.data(),
                                     proto_debug_string_.size());
@@ -1014,29 +1165,93 @@ TEST_F(TextFormatTest, ParseExotic) {
 TEST_F(TextFormatTest, PrintFieldsInIndexOrder) {
   protobuf_unittest::TestFieldOrderings message;
   // Fields are listed in index order instead of field number.
-  message.set_my_string("Test String");   // Field number 11
+  message.set_my_string("str");           // Field number 11
   message.set_my_int(12345);              // Field number 1
   message.set_my_float(0.999);            // Field number 101
+  // Extensions are listed based on the order of extension number.
+  // Extension number 12.
+  message
+      .MutableExtension(
+          protobuf_unittest::TestExtensionOrderings2::test_ext_orderings2)
+      ->set_my_string("ext_str2");
+  // Extension number 13.
+  message
+      .MutableExtension(
+          protobuf_unittest::TestExtensionOrderings1::test_ext_orderings1)
+      ->set_my_string("ext_str1");
+  // Extension number 14.
+  message
+      .MutableExtension(protobuf_unittest::TestExtensionOrderings2::
+                            TestExtensionOrderings3::test_ext_orderings3)
+      ->set_my_string("ext_str3");
+  // Extension number 50.
+  *message.MutableExtension(protobuf_unittest::my_extension_string) = "ext_str0";
+
   TextFormat::Printer printer;
   string text;
 
   // By default, print in field number order.
+  // my_int: 12345
+  // my_string: "str"
+  // [protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] {
+  //   my_string: "ext_str2"
+  // }
+  // [protobuf_unittest.TestExtensionOrderings1.test_ext_orderings1] {
+  //   my_string: "ext_str1"
+  // }
+  // [protobuf_unittest.TestExtensionOrderings2.TestExtensionOrderings3.test_ext_orderings3]
+  // {
+  //   my_string: "ext_str3"
+  // }
+  // [protobuf_unittest.my_extension_string]: "ext_str0"
+  // my_float: 0.999
   printer.PrintToString(message, &text);
-  EXPECT_EQ("my_int: 12345\nmy_string: \"Test String\"\nmy_float: 0.999\n",
-            text);
+  EXPECT_EQ(
+      "my_int: 12345\nmy_string: "
+      "\"str\"\n[protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] "
+      "{\n  my_string: "
+      "\"ext_str2\"\n}\n[protobuf_unittest.TestExtensionOrderings1.test_ext_"
+      "orderings1] {\n  my_string: "
+      "\"ext_str1\"\n}\n[protobuf_unittest.TestExtensionOrderings2."
+      "TestExtensionOrderings3.test_ext_orderings3] {\n  my_string: "
+      "\"ext_str3\"\n}\n[protobuf_unittest.my_extension_string]: "
+      "\"ext_str0\"\nmy_float: 0.999\n",
+      text);
 
   // Print in index order.
+  // my_string: "str"
+  // my_int: 12345
+  // my_float: 0.999
+  // [protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] {
+  //   my_string: "ext_str2"
+  // }
+  // [protobuf_unittest.TestExtensionOrderings1.test_ext_orderings1] {
+  //   my_string: "ext_str1"
+  // }
+  // [protobuf_unittest.TestExtensionOrderings2.TestExtensionOrderings3.test_ext_orderings3]
+  // {
+  //   my_string: "ext_str3"
+  // }
+  // [protobuf_unittest.my_extension_string]: "ext_str0"
   printer.SetPrintMessageFieldsInIndexOrder(true);
   printer.PrintToString(message, &text);
-  EXPECT_EQ("my_string: \"Test String\"\nmy_int: 12345\nmy_float: 0.999\n",
-            text);
+  EXPECT_EQ(
+      "my_string: \"str\"\nmy_int: 12345\nmy_float: "
+      "0.999\n[protobuf_unittest.TestExtensionOrderings2.test_ext_orderings2] "
+      "{\n  my_string: "
+      "\"ext_str2\"\n}\n[protobuf_unittest.TestExtensionOrderings1.test_ext_"
+      "orderings1] {\n  my_string: "
+      "\"ext_str1\"\n}\n[protobuf_unittest.TestExtensionOrderings2."
+      "TestExtensionOrderings3.test_ext_orderings3] {\n  my_string: "
+      "\"ext_str3\"\n}\n[protobuf_unittest.my_extension_string]: \"ext_str0\"\n",
+      text);
 }
 
 class TextFormatParserTest : public testing::Test {
  protected:
   void ExpectFailure(const string& input, const string& message, int line,
                      int col) {
-    google::protobuf::scoped_ptr<unittest::TestAllTypes> proto(new unittest::TestAllTypes);
+    std::unique_ptr<unittest::TestAllTypes> proto(new unittest::TestAllTypes);
     ExpectFailure(input, message, line, col, proto.get());
   }
 
@@ -1097,7 +1312,7 @@ class TextFormatParserTest : public testing::Test {
 };
 
 TEST_F(TextFormatParserTest, ParseInfoTreeBuilding) {
-  google::protobuf::scoped_ptr<unittest::TestAllTypes> message(new unittest::TestAllTypes);
+  std::unique_ptr<unittest::TestAllTypes> message(new unittest::TestAllTypes);
   const Descriptor* d = message->GetDescriptor();
 
   string stringData =
@@ -1162,7 +1377,7 @@ TEST_F(TextFormatParserTest, ParseInfoTreeBuilding) {
 }
 
 TEST_F(TextFormatParserTest, ParseFieldValueFromString) {
-  google::protobuf::scoped_ptr<unittest::TestAllTypes> message(new unittest::TestAllTypes);
+  std::unique_ptr<unittest::TestAllTypes> message(new unittest::TestAllTypes);
   const Descriptor* d = message->GetDescriptor();
 
 #define EXPECT_FIELD(name, value, valuestring) \
diff --git a/src/google/protobuf/timestamp.pb.cc b/src/google/protobuf/timestamp.pb.cc
index c1865d93..8e6b5f23 100644
--- a/src/google/protobuf/timestamp.pb.cc
+++ b/src/google/protobuf/timestamp.pb.cc
@@ -1,95 +1,92 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/timestamp.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class TimestampDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Timestamp> {
+class TimestampDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Timestamp>
+      _instance;
 } _Timestamp_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto {
+static void InitDefaultsTimestamp() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_Timestamp_default_instance_;
+    new (ptr) ::google::protobuf::Timestamp();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Timestamp::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Timestamp =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsTimestamp}, {}};
 
-::google::protobuf::Metadata file_level_metadata[1];
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Timestamp.base);
+}
 
-}  // namespace
+::google::protobuf::Metadata file_level_metadata[1];
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Timestamp, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Timestamp, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Timestamp, seconds_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Timestamp, nanos_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Timestamp, seconds_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Timestamp, nanos_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Timestamp)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Timestamp)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Timestamp_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Timestamp_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/timestamp.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/timestamp.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 1);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Timestamp_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _Timestamp_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\037google/protobuf/timestamp.proto\022\017googl"
       "e.protobuf\"+\n\tTimestamp\022\017\n\007seconds\030\001 \001(\003"
       "\022\r\n\005nanos\030\002 \001(\005B~\n\023com.google.protobufB\016"
@@ -101,25 +98,26 @@ void AddDescriptorsImpl() {
       descriptor, 231);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/timestamp.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void Timestamp::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Timestamp::kSecondsFieldNumber;
 const int Timestamp::kNanosFieldNumber;
@@ -127,37 +125,33 @@ const int Timestamp::kNanosFieldNumber;
 
 Timestamp::Timestamp()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftimestamp_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftimestamp_2eproto::scc_info_Timestamp.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Timestamp)
 }
 Timestamp::Timestamp(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftimestamp_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftimestamp_2eproto::scc_info_Timestamp.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Timestamp)
 }
 Timestamp::Timestamp(const Timestamp& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   ::memcpy(&seconds_, &from.seconds_,
-    reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
+    static_cast<size_t>(reinterpret_cast<char*>(&nanos_) -
+    reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Timestamp)
 }
 
 void Timestamp::SharedCtor() {
-  ::memset(&seconds_, 0, reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
-  _cached_size_ = 0;
+  ::memset(&seconds_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&nanos_) -
+      reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
 }
 
 Timestamp::~Timestamp() {
@@ -166,11 +160,7 @@ Timestamp::~Timestamp() {
 }
 
 void Timestamp::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Timestamp::ArenaDtor(void* object) {
@@ -180,28 +170,29 @@ void Timestamp::ArenaDtor(void* object) {
 void Timestamp::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Timestamp::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Timestamp::descriptor() {
-  protobuf_google_2fprotobuf_2ftimestamp_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftimestamp_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2ftimestamp_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftimestamp_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Timestamp& Timestamp::default_instance() {
-  protobuf_google_2fprotobuf_2ftimestamp_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftimestamp_2eproto::scc_info_Timestamp.base);
   return *internal_default_instance();
 }
 
-Timestamp* Timestamp::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Timestamp>(arena);
-}
 
 void Timestamp::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Timestamp)
-  ::memset(&seconds_, 0, reinterpret_cast<char*>(&nanos_) -
-    reinterpret_cast<char*>(&seconds_) + sizeof(nanos_));
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  ::memset(&seconds_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&nanos_) -
+      reinterpret_cast<char*>(&seconds_)) + sizeof(nanos_));
+  _internal_metadata_.Clear();
 }
 
 bool Timestamp::MergePartialFromCodedStream(
@@ -210,14 +201,14 @@ bool Timestamp::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Timestamp)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // int64 seconds = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int64, ::google::protobuf::internal::WireFormatLite::TYPE_INT64>(
@@ -231,7 +222,7 @@ bool Timestamp::MergePartialFromCodedStream(
       // int32 nanos = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -244,12 +235,11 @@ bool Timestamp::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -266,6 +256,9 @@ failure:
 void Timestamp::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Timestamp)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteInt64(1, this->seconds(), output);
@@ -276,13 +269,20 @@ void Timestamp::SerializeWithCachedSizes(
     ::google::protobuf::internal::WireFormatLite::WriteInt32(2, this->nanos(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Timestamp)
 }
 
 ::google::protobuf::uint8* Timestamp::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Timestamp)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt64ToArray(1, this->seconds(), target);
@@ -293,6 +293,10 @@ void Timestamp::SerializeWithCachedSizes(
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(2, this->nanos(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Timestamp)
   return target;
 }
@@ -301,6 +305,11 @@ size_t Timestamp::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Timestamp)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // int64 seconds = 1;
   if (this->seconds() != 0) {
     total_size += 1 +
@@ -316,9 +325,7 @@ size_t Timestamp::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -341,6 +348,9 @@ void Timestamp::MergeFrom(const Timestamp& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Timestamp)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.seconds() != 0) {
     set_seconds(from.seconds());
   }
@@ -387,51 +397,26 @@ void Timestamp::UnsafeArenaSwap(Timestamp* other) {
   InternalSwap(other);
 }
 void Timestamp::InternalSwap(Timestamp* other) {
-  std::swap(seconds_, other->seconds_);
-  std::swap(nanos_, other->nanos_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(seconds_, other->seconds_);
+  swap(nanos_, other->nanos_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Timestamp::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftimestamp_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftimestamp_2eproto::file_level_metadata[0];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Timestamp
-
-// int64 seconds = 1;
-void Timestamp::clear_seconds() {
-  seconds_ = GOOGLE_LONGLONG(0);
-}
-::google::protobuf::int64 Timestamp::seconds() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Timestamp.seconds)
-  return seconds_;
-}
-void Timestamp::set_seconds(::google::protobuf::int64 value) {
-  
-  seconds_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Timestamp.seconds)
-}
-
-// int32 nanos = 2;
-void Timestamp::clear_nanos() {
-  nanos_ = 0;
-}
-::google::protobuf::int32 Timestamp::nanos() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Timestamp.nanos)
-  return nanos_;
-}
-void Timestamp::set_nanos(::google::protobuf::int32 value) {
-  
-  nanos_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Timestamp.nanos)
+  return ::protobuf_google_2fprotobuf_2ftimestamp_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // @@protoc_insertion_point(namespace_scope)
-
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Timestamp* Arena::CreateMaybeMessage< ::google::protobuf::Timestamp >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Timestamp >(arena);
+}
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/timestamp.pb.h b/src/google/protobuf/timestamp.pb.h
index e6fc09a1..f73e75b3 100644
--- a/src/google/protobuf/timestamp.pb.h
+++ b/src/google/protobuf/timestamp.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/timestamp.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2ftimestamp_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2ftimestamp_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2ftimestamp_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2ftimestamp_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftimestamp_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[1];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto
 namespace google {
 namespace protobuf {
 class Timestamp;
@@ -36,20 +52,13 @@ class TimestampDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern TimestampDefaultTypeInternal _Timestamp_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2ftimestamp_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Timestamp* Arena::CreateMaybeMessage<::google::protobuf::Timestamp>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -64,53 +73,73 @@ class LIBPROTOBUF_EXPORT Timestamp : public ::google::protobuf::Message /* @@pro
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Timestamp(Timestamp&& from) noexcept
+    : Timestamp() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Timestamp& operator=(Timestamp&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Timestamp& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Timestamp* internal_default_instance() {
     return reinterpret_cast<const Timestamp*>(
                &_Timestamp_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void UnsafeArenaSwap(Timestamp* other);
   void Swap(Timestamp* other);
+  friend void swap(Timestamp& a, Timestamp& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Timestamp* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Timestamp* New() const final {
+    return CreateMaybeMessage<Timestamp>(NULL);
+  }
 
-  Timestamp* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Timestamp* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Timestamp>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Timestamp& from);
   void MergeFrom(const Timestamp& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Timestamp* other);
   protected:
   explicit Timestamp(::google::protobuf::Arena* arena);
@@ -126,7 +155,7 @@ class LIBPROTOBUF_EXPORT Timestamp : public ::google::protobuf::Message /* @@pro
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -148,20 +177,23 @@ class LIBPROTOBUF_EXPORT Timestamp : public ::google::protobuf::Message /* @@pro
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::int64 seconds_;
   ::google::protobuf::int32 nanos_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftimestamp_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftimestamp_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Timestamp
 
 // int64 seconds = 1;
@@ -192,14 +224,15 @@ inline void Timestamp::set_nanos(::google::protobuf::int32 value) {
   // @@protoc_insertion_point(field_set:google.protobuf.Timestamp.nanos)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2ftimestamp_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2ftimestamp_2eproto
diff --git a/src/google/protobuf/timestamp.proto b/src/google/protobuf/timestamp.proto
index 67e2eba4..eafb3fa0 100644
--- a/src/google/protobuf/timestamp.proto
+++ b/src/google/protobuf/timestamp.proto
@@ -52,6 +52,8 @@ option objc_class_prefix = "GPB";
 // and from  RFC 3339 date strings.
 // See [https://www.ietf.org/rfc/rfc3339.txt](https://www.ietf.org/rfc/rfc3339.txt).
 //
+// # Examples
+//
 // Example 1: Compute Timestamp from POSIX `time()`.
 //
 //     Timestamp timestamp;
@@ -92,6 +94,31 @@ option objc_class_prefix = "GPB";
 //     timestamp = Timestamp()
 //     timestamp.GetCurrentTime()
 //
+// # JSON Mapping
+//
+// In JSON format, the Timestamp type is encoded as a string in the
+// [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+// format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+// where {year} is always expressed using four digits while {month}, {day},
+// {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+// seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+// is required. A proto3 JSON serializer should always use UTC (as indicated by
+// "Z") when printing the Timestamp type and a proto3 JSON parser should be
+// able to accept both UTC and other timezones (as indicated by an offset).
+//
+// For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+// 01:30 UTC on January 15, 2017.
+//
+// In JavaScript, one can convert a Date object to this format using the
+// standard [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString]
+// method. In Python, a standard `datetime.datetime` object can be converted
+// to this format using [`strftime`](https://docs.python.org/2/library/time.html#time.strftime)
+// with the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one
+// can use the Joda Time's [`ISODateTimeFormat.dateTime()`](
+// http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime--
+// ) to obtain a formatter capable of generating timestamps in this format.
+//
 //
 message Timestamp {
 
diff --git a/src/google/protobuf/type.pb.cc b/src/google/protobuf/type.pb.cc
index 017392c9..130af52a 100644
--- a/src/google/protobuf/type.pb.cc
+++ b/src/google/protobuf/type.pb.cc
@@ -1,172 +1,245 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/type.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
+namespace protobuf_google_2fprotobuf_2fany_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fany_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_Any;
+}  // namespace protobuf_google_2fprotobuf_2fany_2eproto
+namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto ::google::protobuf::internal::SCCInfo<0> scc_info_SourceContext;
+}  // namespace protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto
+namespace protobuf_google_2fprotobuf_2ftype_2eproto {
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftype_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValue;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftype_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_Field;
+extern PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftype_2eproto ::google::protobuf::internal::SCCInfo<1> scc_info_Option;
+}  // namespace protobuf_google_2fprotobuf_2ftype_2eproto
 namespace google {
 namespace protobuf {
-class TypeDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Type> {
+class TypeDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Type>
+      _instance;
 } _Type_default_instance_;
-class FieldDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Field> {
+class FieldDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Field>
+      _instance;
 } _Field_default_instance_;
-class EnumDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Enum> {
+class EnumDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Enum>
+      _instance;
 } _Enum_default_instance_;
-class EnumValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<EnumValue> {
+class EnumValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<EnumValue>
+      _instance;
 } _EnumValue_default_instance_;
-class OptionDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Option> {
+class OptionDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Option>
+      _instance;
 } _Option_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2ftype_2eproto {
+static void InitDefaultsType() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Type_default_instance_;
+    new (ptr) ::google::protobuf::Type();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Type::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<3> scc_info_Type =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 3, InitDefaultsType}, {
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Field.base,
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,
+      &protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::scc_info_SourceContext.base,}};
 
+static void InitDefaultsField() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Field_default_instance_;
+    new (ptr) ::google::protobuf::Field();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Field::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_Field =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsField}, {
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,}};
+
+static void InitDefaultsEnum() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Enum_default_instance_;
+    new (ptr) ::google::protobuf::Enum();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Enum::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<3> scc_info_Enum =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 3, InitDefaultsEnum}, {
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_EnumValue.base,
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,
+      &protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::scc_info_SourceContext.base,}};
+
+static void InitDefaultsEnumValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_EnumValue_default_instance_;
+    new (ptr) ::google::protobuf::EnumValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::EnumValue::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_EnumValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsEnumValue}, {
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base,}};
+
+static void InitDefaultsOption() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Option_default_instance_;
+    new (ptr) ::google::protobuf::Option();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Option::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<1> scc_info_Option =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 1, InitDefaultsOption}, {
+      &protobuf_google_2fprotobuf_2fany_2eproto::scc_info_Any.base,}};
+
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_Type.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Field.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Enum.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_EnumValue.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Option.base);
+}
 
 ::google::protobuf::Metadata file_level_metadata[5];
 const ::google::protobuf::EnumDescriptor* file_level_enum_descriptors[3];
 
-}  // namespace
-
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, fields_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, oneofs_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, source_context_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Type, syntax_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, fields_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, oneofs_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, source_context_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Type, syntax_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, kind_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, cardinality_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, number_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, type_url_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, oneof_index_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, packed_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, json_name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Field, default_value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, kind_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, cardinality_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, number_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, type_url_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, oneof_index_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, packed_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, json_name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Field, default_value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, enumvalue_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, options_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, source_context_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Enum, syntax_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, enumvalue_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, options_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, source_context_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Enum, syntax_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValue, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValue, number_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(EnumValue, options_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValue, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValue, number_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::EnumValue, options_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Option, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Option, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Option, name_),
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Option, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Option, name_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Option, value_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(Type)},
-  { 10, -1, sizeof(Field)},
-  { 24, -1, sizeof(Enum)},
-  { 33, -1, sizeof(EnumValue)},
-  { 40, -1, sizeof(Option)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::Type)},
+  { 11, -1, sizeof(::google::protobuf::Field)},
+  { 26, -1, sizeof(::google::protobuf::Enum)},
+  { 36, -1, sizeof(::google::protobuf::EnumValue)},
+  { 44, -1, sizeof(::google::protobuf::Option)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Type_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Field_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Enum_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_EnumValue_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Option_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Type_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Field_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Enum_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_EnumValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Option_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/type.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/type.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, file_level_enum_descriptors, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 5);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _Type_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-  _Field_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _Enum_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-  _EnumValue_default_instance_.Shutdown();
-  delete file_level_metadata[3].reflection;
-  _Option_default_instance_.Shutdown();
-  delete file_level_metadata[4].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  ::google::protobuf::protobuf_google_2fprotobuf_2fany_2eproto::InitDefaults();
-  ::google::protobuf::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::InitDefaults();
-  _Type_default_instance_.DefaultConstruct();
-  _Field_default_instance_.DefaultConstruct();
-  _Enum_default_instance_.DefaultConstruct();
-  _EnumValue_default_instance_.DefaultConstruct();
-  _Option_default_instance_.DefaultConstruct();
-  _Type_default_instance_.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
-      ::google::protobuf::SourceContext::internal_default_instance());
-  _Enum_default_instance_.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
-      ::google::protobuf::SourceContext::internal_default_instance());
-  _Option_default_instance_.get_mutable()->value_ = const_cast< ::google::protobuf::Any*>(
-      ::google::protobuf::Any::internal_default_instance());
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\032google/protobuf/type.proto\022\017google.pro"
       "tobuf\032\031google/protobuf/any.proto\032$google"
       "/protobuf/source_context.proto\"\327\001\n\004Type\022"
@@ -212,24 +285,23 @@ void AddDescriptorsImpl() {
       descriptor, 1594);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/type.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::protobuf_google_2fprotobuf_2fany_2eproto::AddDescriptors();
-  ::google::protobuf::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::AddDescriptors();
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
+  ::protobuf_google_2fprotobuf_2fany_2eproto::AddDescriptors();
+  ::protobuf_google_2fprotobuf_2fsource_5fcontext_2eproto::AddDescriptors();
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2ftype_2eproto
-
+namespace google {
+namespace protobuf {
 const ::google::protobuf::EnumDescriptor* Field_Kind_descriptor() {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
   return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_enum_descriptors[0];
@@ -327,25 +399,9 @@ bool Syntax_IsValid(int value) {
 
 // ===================================================================
 
-void Type::_slow_mutable_source_context() {
-  source_context_ = ::google::protobuf::Arena::Create< ::google::protobuf::SourceContext >(
-      GetArenaNoVirtual());
-}
-::google::protobuf::SourceContext* Type::_slow_release_source_context() {
-  if (source_context_ == NULL) {
-    return NULL;
-  } else {
-    ::google::protobuf::SourceContext* temp = new ::google::protobuf::SourceContext(*source_context_);
-    source_context_ = NULL;
-    return temp;
-  }
-}
-::google::protobuf::SourceContext* Type::unsafe_arena_release_source_context() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Type.source_context)
-  
-  ::google::protobuf::SourceContext* temp = source_context_;
-  source_context_ = NULL;
-  return temp;
+void Type::InitAsDefaultInstance() {
+  ::google::protobuf::_Type_default_instance_._instance.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
+      ::google::protobuf::SourceContext::internal_default_instance());
 }
 void Type::unsafe_arena_set_allocated_source_context(
     ::google::protobuf::SourceContext* source_context) {
@@ -360,6 +416,12 @@ void Type::unsafe_arena_set_allocated_source_context(
   }
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Type.source_context)
 }
+void Type::clear_source_context() {
+  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) {
+    delete source_context_;
+  }
+  source_context_ = NULL;
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Type::kNameFieldNumber;
 const int Type::kFieldsFieldNumber;
@@ -371,9 +433,8 @@ const int Type::kSyntaxFieldNumber;
 
 Type::Type()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Type.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Type)
 }
@@ -383,9 +444,7 @@ Type::Type(::google::protobuf::Arena* arena)
   fields_(arena),
   oneofs_(arena),
   options_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Type.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Type)
@@ -395,8 +454,7 @@ Type::Type(const Type& from)
       _internal_metadata_(NULL),
       fields_(from.fields_),
       oneofs_(from.oneofs_),
-      options_(from.options_),
-      _cached_size_(0) {
+      options_(from.options_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -414,9 +472,9 @@ Type::Type(const Type& from)
 
 void Type::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&source_context_, 0, reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&source_context_) + sizeof(syntax_));
-  _cached_size_ = 0;
+  ::memset(&source_context_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&syntax_) -
+      reinterpret_cast<char*>(&source_context_)) + sizeof(syntax_));
 }
 
 Type::~Type() {
@@ -425,15 +483,9 @@ Type::~Type() {
 }
 
 void Type::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  if (this != internal_default_instance()) {
-    delete source_context_;
-  }
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (this != internal_default_instance()) delete source_context_;
 }
 
 void Type::ArenaDtor(void* object) {
@@ -443,26 +495,25 @@ void Type::ArenaDtor(void* object) {
 void Type::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Type::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Type::descriptor() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Type& Type::default_instance() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Type.base);
   return *internal_default_instance();
 }
 
-Type* Type::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Type>(arena);
-}
 
 void Type::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Type)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   fields_.Clear();
   oneofs_.Clear();
   options_.Clear();
@@ -472,6 +523,7 @@ void Type::Clear() {
   }
   source_context_ = NULL;
   syntax_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool Type::MergePartialFromCodedStream(
@@ -480,18 +532,18 @@ bool Type::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Type)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Type.name"));
         } else {
@@ -503,26 +555,24 @@ bool Type::MergePartialFromCodedStream(
       // repeated .google.protobuf.Field fields = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_fields()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated string oneofs = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->add_oneofs()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
             this->oneofs(this->oneofs_size() - 1).data(),
-            this->oneofs(this->oneofs_size() - 1).length(),
+            static_cast<int>(this->oneofs(this->oneofs_size() - 1).length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Type.oneofs"));
         } else {
@@ -534,22 +584,20 @@ bool Type::MergePartialFromCodedStream(
       // repeated .google.protobuf.Option options = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // .google.protobuf.SourceContext source_context = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(42u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(42u /* 42 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_source_context()));
         } else {
           goto handle_unusual;
@@ -560,7 +608,7 @@ bool Type::MergePartialFromCodedStream(
       // .google.protobuf.Syntax syntax = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(48u)) {
+            static_cast< ::google::protobuf::uint8>(48u /* 48 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -574,12 +622,11 @@ bool Type::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -596,10 +643,13 @@ failure:
 void Type::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Type)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Type.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -607,15 +657,18 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Field fields = 2;
-  for (unsigned int i = 0, n = this->fields_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->fields_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->fields(i), output);
+      2,
+      this->fields(static_cast<int>(i)),
+      output);
   }
 
   // repeated string oneofs = 3;
   for (int i = 0, n = this->oneofs_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->oneofs(i).data(), this->oneofs(i).length(),
+      this->oneofs(i).data(), static_cast<int>(this->oneofs(i).length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Type.oneofs");
     ::google::protobuf::internal::WireFormatLite::WriteString(
@@ -623,15 +676,18 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 4;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      4, this->options(i), output);
+      4,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      5, *this->source_context_, output);
+      5, this->_internal_source_context(), output);
   }
 
   // .google.protobuf.Syntax syntax = 6;
@@ -640,17 +696,24 @@ void Type::SerializeWithCachedSizes(
       6, this->syntax(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Type)
 }
 
 ::google::protobuf::uint8* Type::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Type)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Type.name");
     target =
@@ -659,16 +722,17 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Field fields = 2;
-  for (unsigned int i = 0, n = this->fields_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->fields_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->fields(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->fields(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated string oneofs = 3;
   for (int i = 0, n = this->oneofs_size(); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->oneofs(i).data(), this->oneofs(i).length(),
+      this->oneofs(i).data(), static_cast<int>(this->oneofs(i).length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Type.oneofs");
     target = ::google::protobuf::internal::WireFormatLite::
@@ -676,17 +740,18 @@ void Type::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 4;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        4, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        4, this->options(static_cast<int>(i)), deterministic, target);
   }
 
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        5, *this->source_context_, false, target);
+      InternalWriteMessageToArray(
+        5, this->_internal_source_context(), deterministic, target);
   }
 
   // .google.protobuf.Syntax syntax = 6;
@@ -695,6 +760,10 @@ void Type::SerializeWithCachedSizes(
       6, this->syntax(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Type)
   return target;
 }
@@ -703,14 +772,19 @@ size_t Type::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Type)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Field fields = 2;
   {
-    unsigned int count = this->fields_size();
+    unsigned int count = static_cast<unsigned int>(this->fields_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->fields(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->fields(static_cast<int>(i)));
     }
   }
 
@@ -724,12 +798,12 @@ size_t Type::ByteSizeLong() const {
 
   // repeated .google.protobuf.Option options = 4;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
@@ -743,8 +817,8 @@ size_t Type::ByteSizeLong() const {
   // .google.protobuf.SourceContext source_context = 5;
   if (this->has_source_context()) {
     total_size += 1 +
-      ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-        *this->source_context_);
+      ::google::protobuf::internal::WireFormatLite::MessageSize(
+        *source_context_);
   }
 
   // .google.protobuf.Syntax syntax = 6;
@@ -754,9 +828,7 @@ size_t Type::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -779,6 +851,9 @@ void Type::MergeFrom(const Type& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Type)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   fields_.MergeFrom(from.fields_);
   oneofs_.MergeFrom(from.oneofs_);
   options_.MergeFrom(from.options_);
@@ -831,285 +906,27 @@ void Type::UnsafeArenaSwap(Type* other) {
   InternalSwap(other);
 }
 void Type::InternalSwap(Type* other) {
-  fields_.UnsafeArenaSwap(&other->fields_);
-  oneofs_.UnsafeArenaSwap(&other->oneofs_);
-  options_.UnsafeArenaSwap(&other->options_);
-  name_.Swap(&other->name_);
-  std::swap(source_context_, other->source_context_);
-  std::swap(syntax_, other->syntax_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&fields_)->InternalSwap(CastToBase(&other->fields_));
+  oneofs_.InternalSwap(CastToBase(&other->oneofs_));
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(source_context_, other->source_context_);
+  swap(syntax_, other->syntax_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Type::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[0];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Type
-
-// string name = 1;
-void Type::clear_name() {
-  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Type::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.name)
-  return name_.Get();
-}
-void Type::set_name(const ::std::string& value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Type.name)
-}
-void Type::set_name(const char* value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Type.name)
-}
-void Type::set_name(const char* value,
-    size_t size) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Type.name)
-}
-::std::string* Type::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Type.name)
-  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Type::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Type.name)
-  
-  return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Type::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Type.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Type::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Type.name)
-}
-void Type::unsafe_arena_set_allocated_name(
-    ::std::string* name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Type.name)
-}
-
-// repeated .google.protobuf.Field fields = 2;
-int Type::fields_size() const {
-  return fields_.size();
-}
-void Type::clear_fields() {
-  fields_.Clear();
-}
-const ::google::protobuf::Field& Type::fields(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.fields)
-  return fields_.Get(index);
-}
-::google::protobuf::Field* Type::mutable_fields(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Type.fields)
-  return fields_.Mutable(index);
-}
-::google::protobuf::Field* Type::add_fields() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.fields)
-  return fields_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >*
-Type::mutable_fields() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Type.fields)
-  return &fields_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >&
-Type::fields() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Type.fields)
-  return fields_;
-}
-
-// repeated string oneofs = 3;
-int Type::oneofs_size() const {
-  return oneofs_.size();
-}
-void Type::clear_oneofs() {
-  oneofs_.Clear();
-}
-const ::std::string& Type::oneofs(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.oneofs)
-  return oneofs_.Get(index);
-}
-::std::string* Type::mutable_oneofs(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Type.oneofs)
-  return oneofs_.Mutable(index);
-}
-void Type::set_oneofs(int index, const ::std::string& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.Type.oneofs)
-  oneofs_.Mutable(index)->assign(value);
-}
-#if LANG_CXX11
-void Type::set_oneofs(int index, ::std::string&& value) {
-  // @@protoc_insertion_point(field_set:google.protobuf.Type.oneofs)
-  oneofs_.Mutable(index)->assign(std::move(value));
-}
-#endif
-void Type::set_oneofs(int index, const char* value) {
-  oneofs_.Mutable(index)->assign(value);
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Type.oneofs)
-}
-void Type::set_oneofs(int index, const char* value, size_t size) {
-  oneofs_.Mutable(index)->assign(
-    reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Type.oneofs)
-}
-::std::string* Type::add_oneofs() {
-  // @@protoc_insertion_point(field_add_mutable:google.protobuf.Type.oneofs)
-  return oneofs_.Add();
-}
-void Type::add_oneofs(const ::std::string& value) {
-  oneofs_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.oneofs)
-}
-#if LANG_CXX11
-void Type::add_oneofs(::std::string&& value) {
-  oneofs_.Add()->assign(std::move(value));
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.oneofs)
-}
-#endif
-void Type::add_oneofs(const char* value) {
-  oneofs_.Add()->assign(value);
-  // @@protoc_insertion_point(field_add_char:google.protobuf.Type.oneofs)
-}
-void Type::add_oneofs(const char* value, size_t size) {
-  oneofs_.Add()->assign(reinterpret_cast<const char*>(value), size);
-  // @@protoc_insertion_point(field_add_pointer:google.protobuf.Type.oneofs)
-}
-const ::google::protobuf::RepeatedPtrField< ::std::string>&
-Type::oneofs() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Type.oneofs)
-  return oneofs_;
-}
-::google::protobuf::RepeatedPtrField< ::std::string>*
-Type::mutable_oneofs() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Type.oneofs)
-  return &oneofs_;
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// repeated .google.protobuf.Option options = 4;
-int Type::options_size() const {
-  return options_.size();
-}
-void Type::clear_options() {
-  options_.Clear();
-}
-const ::google::protobuf::Option& Type::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* Type::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Type.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* Type::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-Type::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Type.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-Type::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Type.options)
-  return options_;
-}
-
-// .google.protobuf.SourceContext source_context = 5;
-bool Type::has_source_context() const {
-  return this != internal_default_instance() && source_context_ != NULL;
-}
-void Type::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
-}
-const ::google::protobuf::SourceContext& Type::source_context() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
-}
-::google::protobuf::SourceContext* Type::mutable_source_context() {
-  
-  if (source_context_ == NULL) {
-    _slow_mutable_source_context();
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Type.source_context)
-  return source_context_;
-}
-::google::protobuf::SourceContext* Type::release_source_context() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Type.source_context)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_source_context();
-  } else {
-    ::google::protobuf::SourceContext* temp = source_context_;
-    source_context_ = NULL;
-    return temp;
-  }
-}
- void Type::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
-  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
-  if (message_arena == NULL) {
-    delete source_context_;
-  }
-  if (source_context != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(source_context);
-    }
-  }
-  source_context_ = source_context;
-  if (source_context) {
-    
-  } else {
-    
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Type.source_context)
-}
-
-// .google.protobuf.Syntax syntax = 6;
-void Type::clear_syntax() {
-  syntax_ = 0;
-}
-::google::protobuf::Syntax Type::syntax() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.syntax)
-  return static_cast< ::google::protobuf::Syntax >(syntax_);
-}
-void Type::set_syntax(::google::protobuf::Syntax value) {
-  
-  syntax_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Type.syntax)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void Field::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Field::kKindFieldNumber;
 const int Field::kCardinalityFieldNumber;
@@ -1125,9 +942,8 @@ const int Field::kDefaultValueFieldNumber;
 
 Field::Field()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Field.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Field)
 }
@@ -1135,9 +951,7 @@ Field::Field(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena),
   options_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Field.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Field)
@@ -1145,8 +959,7 @@ Field::Field(::google::protobuf::Arena* arena)
 Field::Field(const Field& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      options_(from.options_),
-      _cached_size_(0) {
+      options_(from.options_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -1169,8 +982,8 @@ Field::Field(const Field& from)
       GetArenaNoVirtual());
   }
   ::memcpy(&kind_, &from.kind_,
-    reinterpret_cast<char*>(&packed_) -
-    reinterpret_cast<char*>(&kind_) + sizeof(packed_));
+    static_cast<size_t>(reinterpret_cast<char*>(&packed_) -
+    reinterpret_cast<char*>(&kind_)) + sizeof(packed_));
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Field)
 }
 
@@ -1179,9 +992,9 @@ void Field::SharedCtor() {
   type_url_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   json_name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   default_value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&kind_, 0, reinterpret_cast<char*>(&packed_) -
-    reinterpret_cast<char*>(&kind_) + sizeof(packed_));
-  _cached_size_ = 0;
+  ::memset(&kind_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&packed_) -
+      reinterpret_cast<char*>(&kind_)) + sizeof(packed_));
 }
 
 Field::~Field() {
@@ -1190,15 +1003,11 @@ Field::~Field() {
 }
 
 void Field::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  type_url_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  json_name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  default_value_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  type_url_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  json_name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  default_value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
 void Field::ArenaDtor(void* object) {
@@ -1208,33 +1017,34 @@ void Field::ArenaDtor(void* object) {
 void Field::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Field::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Field::descriptor() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Field& Field::default_instance() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Field.base);
   return *internal_default_instance();
 }
 
-Field* Field::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Field>(arena);
-}
 
 void Field::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Field)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   options_.Clear();
   name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   type_url_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   json_name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   default_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-  ::memset(&kind_, 0, reinterpret_cast<char*>(&packed_) -
-    reinterpret_cast<char*>(&kind_) + sizeof(packed_));
+  ::memset(&kind_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&packed_) -
+      reinterpret_cast<char*>(&kind_)) + sizeof(packed_));
+  _internal_metadata_.Clear();
 }
 
 bool Field::MergePartialFromCodedStream(
@@ -1243,14 +1053,14 @@ bool Field::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Field)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // .google.protobuf.Field.Kind kind = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -1265,7 +1075,7 @@ bool Field::MergePartialFromCodedStream(
       // .google.protobuf.Field.Cardinality cardinality = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -1280,7 +1090,7 @@ bool Field::MergePartialFromCodedStream(
       // int32 number = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(24u)) {
+            static_cast< ::google::protobuf::uint8>(24u /* 24 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -1294,11 +1104,11 @@ bool Field::MergePartialFromCodedStream(
       // string name = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Field.name"));
         } else {
@@ -1310,11 +1120,11 @@ bool Field::MergePartialFromCodedStream(
       // string type_url = 6;
       case 6: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(50u)) {
+            static_cast< ::google::protobuf::uint8>(50u /* 50 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_type_url()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->type_url().data(), this->type_url().length(),
+            this->type_url().data(), static_cast<int>(this->type_url().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Field.type_url"));
         } else {
@@ -1326,7 +1136,7 @@ bool Field::MergePartialFromCodedStream(
       // int32 oneof_index = 7;
       case 7: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(56u)) {
+            static_cast< ::google::protobuf::uint8>(56u /* 56 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -1340,7 +1150,7 @@ bool Field::MergePartialFromCodedStream(
       // bool packed = 8;
       case 8: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(64u)) {
+            static_cast< ::google::protobuf::uint8>(64u /* 64 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -1354,25 +1164,23 @@ bool Field::MergePartialFromCodedStream(
       // repeated .google.protobuf.Option options = 9;
       case 9: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(74u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(74u /* 74 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // string json_name = 10;
       case 10: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(82u)) {
+            static_cast< ::google::protobuf::uint8>(82u /* 82 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_json_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->json_name().data(), this->json_name().length(),
+            this->json_name().data(), static_cast<int>(this->json_name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Field.json_name"));
         } else {
@@ -1384,11 +1192,11 @@ bool Field::MergePartialFromCodedStream(
       // string default_value = 11;
       case 11: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(90u)) {
+            static_cast< ::google::protobuf::uint8>(90u /* 90 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_default_value()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->default_value().data(), this->default_value().length(),
+            this->default_value().data(), static_cast<int>(this->default_value().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Field.default_value"));
         } else {
@@ -1399,12 +1207,11 @@ bool Field::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1421,6 +1228,9 @@ failure:
 void Field::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Field)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // .google.protobuf.Field.Kind kind = 1;
   if (this->kind() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteEnum(
@@ -1441,7 +1251,7 @@ void Field::SerializeWithCachedSizes(
   // string name = 4;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1451,7 +1261,7 @@ void Field::SerializeWithCachedSizes(
   // string type_url = 6;
   if (this->type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->type_url().data(), this->type_url().length(),
+      this->type_url().data(), static_cast<int>(this->type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.type_url");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1469,15 +1279,18 @@ void Field::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 9;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      9, this->options(i), output);
+      9,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
   // string json_name = 10;
   if (this->json_name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->json_name().data(), this->json_name().length(),
+      this->json_name().data(), static_cast<int>(this->json_name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.json_name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -1487,20 +1300,27 @@ void Field::SerializeWithCachedSizes(
   // string default_value = 11;
   if (this->default_value().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->default_value().data(), this->default_value().length(),
+      this->default_value().data(), static_cast<int>(this->default_value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.default_value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
       11, this->default_value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Field)
 }
 
 ::google::protobuf::uint8* Field::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Field)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // .google.protobuf.Field.Kind kind = 1;
   if (this->kind() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteEnumToArray(
@@ -1521,7 +1341,7 @@ void Field::SerializeWithCachedSizes(
   // string name = 4;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.name");
     target =
@@ -1532,7 +1352,7 @@ void Field::SerializeWithCachedSizes(
   // string type_url = 6;
   if (this->type_url().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->type_url().data(), this->type_url().length(),
+      this->type_url().data(), static_cast<int>(this->type_url().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.type_url");
     target =
@@ -1551,16 +1371,17 @@ void Field::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 9;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        9, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        9, this->options(static_cast<int>(i)), deterministic, target);
   }
 
   // string json_name = 10;
   if (this->json_name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->json_name().data(), this->json_name().length(),
+      this->json_name().data(), static_cast<int>(this->json_name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.json_name");
     target =
@@ -1571,7 +1392,7 @@ void Field::SerializeWithCachedSizes(
   // string default_value = 11;
   if (this->default_value().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->default_value().data(), this->default_value().length(),
+      this->default_value().data(), static_cast<int>(this->default_value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Field.default_value");
     target =
@@ -1579,6 +1400,10 @@ void Field::SerializeWithCachedSizes(
         11, this->default_value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Field)
   return target;
 }
@@ -1587,14 +1412,19 @@ size_t Field::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Field)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Option options = 9;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
@@ -1658,9 +1488,7 @@ size_t Field::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1683,6 +1511,9 @@ void Field::MergeFrom(const Field& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Field)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   options_.MergeFrom(from.options_);
   if (from.name().size() > 0) {
     set_name(from.name());
@@ -1751,414 +1582,35 @@ void Field::UnsafeArenaSwap(Field* other) {
   InternalSwap(other);
 }
 void Field::InternalSwap(Field* other) {
-  options_.UnsafeArenaSwap(&other->options_);
-  name_.Swap(&other->name_);
-  type_url_.Swap(&other->type_url_);
-  json_name_.Swap(&other->json_name_);
-  default_value_.Swap(&other->default_value_);
-  std::swap(kind_, other->kind_);
-  std::swap(cardinality_, other->cardinality_);
-  std::swap(number_, other->number_);
-  std::swap(oneof_index_, other->oneof_index_);
-  std::swap(packed_, other->packed_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  type_url_.Swap(&other->type_url_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  json_name_.Swap(&other->json_name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  default_value_.Swap(&other->default_value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(kind_, other->kind_);
+  swap(cardinality_, other->cardinality_);
+  swap(number_, other->number_);
+  swap(oneof_index_, other->oneof_index_);
+  swap(packed_, other->packed_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Field::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[1];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Field
-
-// .google.protobuf.Field.Kind kind = 1;
-void Field::clear_kind() {
-  kind_ = 0;
-}
-::google::protobuf::Field_Kind Field::kind() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.kind)
-  return static_cast< ::google::protobuf::Field_Kind >(kind_);
-}
-void Field::set_kind(::google::protobuf::Field_Kind value) {
-  
-  kind_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.kind)
-}
-
-// .google.protobuf.Field.Cardinality cardinality = 2;
-void Field::clear_cardinality() {
-  cardinality_ = 0;
-}
-::google::protobuf::Field_Cardinality Field::cardinality() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.cardinality)
-  return static_cast< ::google::protobuf::Field_Cardinality >(cardinality_);
-}
-void Field::set_cardinality(::google::protobuf::Field_Cardinality value) {
-  
-  cardinality_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.cardinality)
-}
-
-// int32 number = 3;
-void Field::clear_number() {
-  number_ = 0;
-}
-::google::protobuf::int32 Field::number() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.number)
-  return number_;
-}
-void Field::set_number(::google::protobuf::int32 value) {
-  
-  number_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.number)
-}
-
-// string name = 4;
-void Field::clear_name() {
-  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Field::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.name)
-  return name_.Get();
-}
-void Field::set_name(const ::std::string& value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.name)
-}
-void Field::set_name(const char* value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Field.name)
-}
-void Field::set_name(const char* value,
-    size_t size) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Field.name)
-}
-::std::string* Field::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Field.name)
-  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Field.name)
-  
-  return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Field::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.name)
-}
-void Field::unsafe_arena_set_allocated_name(
-    ::std::string* name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Field.name)
-}
-
-// string type_url = 6;
-void Field::clear_type_url() {
-  type_url_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Field::type_url() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.type_url)
-  return type_url_.Get();
-}
-void Field::set_type_url(const ::std::string& value) {
-  
-  type_url_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.type_url)
-}
-void Field::set_type_url(const char* value) {
-  
-  type_url_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Field.type_url)
-}
-void Field::set_type_url(const char* value,
-    size_t size) {
-  
-  type_url_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Field.type_url)
-}
-::std::string* Field::mutable_type_url() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Field.type_url)
-  return type_url_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::release_type_url() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Field.type_url)
-  
-  return type_url_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::unsafe_arena_release_type_url() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.type_url)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return type_url_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Field::set_allocated_type_url(::std::string* type_url) {
-  if (type_url != NULL) {
-    
-  } else {
-    
-  }
-  type_url_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), type_url,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.type_url)
-}
-void Field::unsafe_arena_set_allocated_type_url(
-    ::std::string* type_url) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (type_url != NULL) {
-    
-  } else {
-    
-  }
-  type_url_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      type_url, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Field.type_url)
-}
-
-// int32 oneof_index = 7;
-void Field::clear_oneof_index() {
-  oneof_index_ = 0;
-}
-::google::protobuf::int32 Field::oneof_index() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.oneof_index)
-  return oneof_index_;
-}
-void Field::set_oneof_index(::google::protobuf::int32 value) {
-  
-  oneof_index_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.oneof_index)
-}
-
-// bool packed = 8;
-void Field::clear_packed() {
-  packed_ = false;
-}
-bool Field::packed() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.packed)
-  return packed_;
-}
-void Field::set_packed(bool value) {
-  
-  packed_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.packed)
-}
-
-// repeated .google.protobuf.Option options = 9;
-int Field::options_size() const {
-  return options_.size();
-}
-void Field::clear_options() {
-  options_.Clear();
-}
-const ::google::protobuf::Option& Field::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* Field::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Field.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* Field::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Field.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-Field::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Field.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-Field::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Field.options)
-  return options_;
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-// string json_name = 10;
-void Field::clear_json_name() {
-  json_name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Field::json_name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.json_name)
-  return json_name_.Get();
-}
-void Field::set_json_name(const ::std::string& value) {
-  
-  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.json_name)
-}
-void Field::set_json_name(const char* value) {
-  
-  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Field.json_name)
-}
-void Field::set_json_name(const char* value,
-    size_t size) {
-  
-  json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Field.json_name)
-}
-::std::string* Field::mutable_json_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Field.json_name)
-  return json_name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::release_json_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Field.json_name)
-  
-  return json_name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::unsafe_arena_release_json_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.json_name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return json_name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Field::set_allocated_json_name(::std::string* json_name) {
-  if (json_name != NULL) {
-    
-  } else {
-    
-  }
-  json_name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), json_name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.json_name)
-}
-void Field::unsafe_arena_set_allocated_json_name(
-    ::std::string* json_name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (json_name != NULL) {
-    
-  } else {
-    
-  }
-  json_name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      json_name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Field.json_name)
-}
-
-// string default_value = 11;
-void Field::clear_default_value() {
-  default_value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Field::default_value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.default_value)
-  return default_value_.Get();
-}
-void Field::set_default_value(const ::std::string& value) {
-  
-  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Field.default_value)
-}
-void Field::set_default_value(const char* value) {
-  
-  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Field.default_value)
-}
-void Field::set_default_value(const char* value,
-    size_t size) {
-  
-  default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Field.default_value)
-}
-::std::string* Field::mutable_default_value() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Field.default_value)
-  return default_value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::release_default_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Field.default_value)
-  
-  return default_value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Field::unsafe_arena_release_default_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.default_value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return default_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Field::set_allocated_default_value(::std::string* default_value) {
-  if (default_value != NULL) {
-    
-  } else {
-    
-  }
-  default_value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), default_value,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.default_value)
-}
-void Field::unsafe_arena_set_allocated_default_value(
-    ::std::string* default_value) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (default_value != NULL) {
-    
-  } else {
-    
-  }
-  default_value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      default_value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Field.default_value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
-void Enum::_slow_mutable_source_context() {
-  source_context_ = ::google::protobuf::Arena::Create< ::google::protobuf::SourceContext >(
-      GetArenaNoVirtual());
-}
-::google::protobuf::SourceContext* Enum::_slow_release_source_context() {
-  if (source_context_ == NULL) {
-    return NULL;
-  } else {
-    ::google::protobuf::SourceContext* temp = new ::google::protobuf::SourceContext(*source_context_);
-    source_context_ = NULL;
-    return temp;
-  }
-}
-::google::protobuf::SourceContext* Enum::unsafe_arena_release_source_context() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Enum.source_context)
-  
-  ::google::protobuf::SourceContext* temp = source_context_;
-  source_context_ = NULL;
-  return temp;
+void Enum::InitAsDefaultInstance() {
+  ::google::protobuf::_Enum_default_instance_._instance.get_mutable()->source_context_ = const_cast< ::google::protobuf::SourceContext*>(
+      ::google::protobuf::SourceContext::internal_default_instance());
 }
 void Enum::unsafe_arena_set_allocated_source_context(
     ::google::protobuf::SourceContext* source_context) {
@@ -2173,6 +1625,12 @@ void Enum::unsafe_arena_set_allocated_source_context(
   }
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Enum.source_context)
 }
+void Enum::clear_source_context() {
+  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) {
+    delete source_context_;
+  }
+  source_context_ = NULL;
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Enum::kNameFieldNumber;
 const int Enum::kEnumvalueFieldNumber;
@@ -2183,9 +1641,8 @@ const int Enum::kSyntaxFieldNumber;
 
 Enum::Enum()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Enum.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Enum)
 }
@@ -2194,9 +1651,7 @@ Enum::Enum(::google::protobuf::Arena* arena)
   _internal_metadata_(arena),
   enumvalue_(arena),
   options_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Enum.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Enum)
@@ -2205,8 +1660,7 @@ Enum::Enum(const Enum& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
       enumvalue_(from.enumvalue_),
-      options_(from.options_),
-      _cached_size_(0) {
+      options_(from.options_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -2224,9 +1678,9 @@ Enum::Enum(const Enum& from)
 
 void Enum::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  ::memset(&source_context_, 0, reinterpret_cast<char*>(&syntax_) -
-    reinterpret_cast<char*>(&source_context_) + sizeof(syntax_));
-  _cached_size_ = 0;
+  ::memset(&source_context_, 0, static_cast<size_t>(
+      reinterpret_cast<char*>(&syntax_) -
+      reinterpret_cast<char*>(&source_context_)) + sizeof(syntax_));
 }
 
 Enum::~Enum() {
@@ -2235,15 +1689,9 @@ Enum::~Enum() {
 }
 
 void Enum::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  if (this != internal_default_instance()) {
-    delete source_context_;
-  }
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (this != internal_default_instance()) delete source_context_;
 }
 
 void Enum::ArenaDtor(void* object) {
@@ -2253,26 +1701,25 @@ void Enum::ArenaDtor(void* object) {
 void Enum::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Enum::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Enum::descriptor() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Enum& Enum::default_instance() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Enum.base);
   return *internal_default_instance();
 }
 
-Enum* Enum::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Enum>(arena);
-}
 
 void Enum::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Enum)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   enumvalue_.Clear();
   options_.Clear();
   name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
@@ -2281,6 +1728,7 @@ void Enum::Clear() {
   }
   source_context_ = NULL;
   syntax_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool Enum::MergePartialFromCodedStream(
@@ -2289,18 +1737,18 @@ bool Enum::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Enum)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Enum.name"));
         } else {
@@ -2312,36 +1760,32 @@ bool Enum::MergePartialFromCodedStream(
       // repeated .google.protobuf.EnumValue enumvalue = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_enumvalue()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // repeated .google.protobuf.Option options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       // .google.protobuf.SourceContext source_context = 4;
       case 4: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(34u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(34u /* 34 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_source_context()));
         } else {
           goto handle_unusual;
@@ -2352,7 +1796,7 @@ bool Enum::MergePartialFromCodedStream(
       // .google.protobuf.Syntax syntax = 5;
       case 5: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(40u)) {
+            static_cast< ::google::protobuf::uint8>(40u /* 40 & 0xFF */)) {
           int value;
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    int, ::google::protobuf::internal::WireFormatLite::TYPE_ENUM>(
@@ -2366,12 +1810,11 @@ bool Enum::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2388,10 +1831,13 @@ failure:
 void Enum::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Enum)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Enum.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -2399,21 +1845,27 @@ void Enum::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.EnumValue enumvalue = 2;
-  for (unsigned int i = 0, n = this->enumvalue_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enumvalue_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, this->enumvalue(i), output);
+      2,
+      this->enumvalue(static_cast<int>(i)),
+      output);
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, this->options(i), output);
+      3,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
   // .google.protobuf.SourceContext source_context = 4;
   if (this->has_source_context()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      4, *this->source_context_, output);
+      4, this->_internal_source_context(), output);
   }
 
   // .google.protobuf.Syntax syntax = 5;
@@ -2422,17 +1874,24 @@ void Enum::SerializeWithCachedSizes(
       5, this->syntax(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Enum)
 }
 
 ::google::protobuf::uint8* Enum::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Enum)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Enum.name");
     target =
@@ -2441,24 +1900,26 @@ void Enum::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.EnumValue enumvalue = 2;
-  for (unsigned int i = 0, n = this->enumvalue_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->enumvalue_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, this->enumvalue(i), false, target);
+      InternalWriteMessageToArray(
+        2, this->enumvalue(static_cast<int>(i)), deterministic, target);
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        3, this->options(static_cast<int>(i)), deterministic, target);
   }
 
   // .google.protobuf.SourceContext source_context = 4;
   if (this->has_source_context()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        4, *this->source_context_, false, target);
+      InternalWriteMessageToArray(
+        4, this->_internal_source_context(), deterministic, target);
   }
 
   // .google.protobuf.Syntax syntax = 5;
@@ -2467,6 +1928,10 @@ void Enum::SerializeWithCachedSizes(
       5, this->syntax(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Enum)
   return target;
 }
@@ -2475,25 +1940,30 @@ size_t Enum::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Enum)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.EnumValue enumvalue = 2;
   {
-    unsigned int count = this->enumvalue_size();
+    unsigned int count = static_cast<unsigned int>(this->enumvalue_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->enumvalue(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->enumvalue(static_cast<int>(i)));
     }
   }
 
   // repeated .google.protobuf.Option options = 3;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
@@ -2507,8 +1977,8 @@ size_t Enum::ByteSizeLong() const {
   // .google.protobuf.SourceContext source_context = 4;
   if (this->has_source_context()) {
     total_size += 1 +
-      ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-        *this->source_context_);
+      ::google::protobuf::internal::WireFormatLite::MessageSize(
+        *source_context_);
   }
 
   // .google.protobuf.Syntax syntax = 5;
@@ -2518,9 +1988,7 @@ size_t Enum::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -2543,6 +2011,9 @@ void Enum::MergeFrom(const Enum& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Enum)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   enumvalue_.MergeFrom(from.enumvalue_);
   options_.MergeFrom(from.options_);
   if (from.name().size() > 0) {
@@ -2594,217 +2065,26 @@ void Enum::UnsafeArenaSwap(Enum* other) {
   InternalSwap(other);
 }
 void Enum::InternalSwap(Enum* other) {
-  enumvalue_.UnsafeArenaSwap(&other->enumvalue_);
-  options_.UnsafeArenaSwap(&other->options_);
-  name_.Swap(&other->name_);
-  std::swap(source_context_, other->source_context_);
-  std::swap(syntax_, other->syntax_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&enumvalue_)->InternalSwap(CastToBase(&other->enumvalue_));
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(source_context_, other->source_context_);
+  swap(syntax_, other->syntax_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Enum::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[2];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Enum
-
-// string name = 1;
-void Enum::clear_name() {
-  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Enum::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.name)
-  return name_.Get();
-}
-void Enum::set_name(const ::std::string& value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Enum.name)
-}
-void Enum::set_name(const char* value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Enum.name)
-}
-void Enum::set_name(const char* value,
-    size_t size) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Enum.name)
-}
-::std::string* Enum::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.name)
-  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Enum::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Enum.name)
-  
-  return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Enum::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Enum.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Enum::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Enum.name)
-}
-void Enum::unsafe_arena_set_allocated_name(
-    ::std::string* name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Enum.name)
-}
-
-// repeated .google.protobuf.EnumValue enumvalue = 2;
-int Enum::enumvalue_size() const {
-  return enumvalue_.size();
-}
-void Enum::clear_enumvalue() {
-  enumvalue_.Clear();
-}
-const ::google::protobuf::EnumValue& Enum::enumvalue(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.enumvalue)
-  return enumvalue_.Get(index);
-}
-::google::protobuf::EnumValue* Enum::mutable_enumvalue(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.enumvalue)
-  return enumvalue_.Mutable(index);
-}
-::google::protobuf::EnumValue* Enum::add_enumvalue() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Enum.enumvalue)
-  return enumvalue_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >*
-Enum::mutable_enumvalue() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Enum.enumvalue)
-  return &enumvalue_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >&
-Enum::enumvalue() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Enum.enumvalue)
-  return enumvalue_;
-}
-
-// repeated .google.protobuf.Option options = 3;
-int Enum::options_size() const {
-  return options_.size();
-}
-void Enum::clear_options() {
-  options_.Clear();
-}
-const ::google::protobuf::Option& Enum::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* Enum::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* Enum::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Enum.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-Enum::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.Enum.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-Enum::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.Enum.options)
-  return options_;
-}
-
-// .google.protobuf.SourceContext source_context = 4;
-bool Enum::has_source_context() const {
-  return this != internal_default_instance() && source_context_ != NULL;
-}
-void Enum::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
-}
-const ::google::protobuf::SourceContext& Enum::source_context() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
-}
-::google::protobuf::SourceContext* Enum::mutable_source_context() {
-  
-  if (source_context_ == NULL) {
-    _slow_mutable_source_context();
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.source_context)
-  return source_context_;
-}
-::google::protobuf::SourceContext* Enum::release_source_context() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Enum.source_context)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_source_context();
-  } else {
-    ::google::protobuf::SourceContext* temp = source_context_;
-    source_context_ = NULL;
-    return temp;
-  }
-}
- void Enum::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
-  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
-  if (message_arena == NULL) {
-    delete source_context_;
-  }
-  if (source_context != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(source_context);
-    }
-  }
-  source_context_ = source_context;
-  if (source_context) {
-    
-  } else {
-    
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Enum.source_context)
-}
-
-// .google.protobuf.Syntax syntax = 5;
-void Enum::clear_syntax() {
-  syntax_ = 0;
-}
-::google::protobuf::Syntax Enum::syntax() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.syntax)
-  return static_cast< ::google::protobuf::Syntax >(syntax_);
-}
-void Enum::set_syntax(::google::protobuf::Syntax value) {
-  
-  syntax_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Enum.syntax)
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void EnumValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int EnumValue::kNameFieldNumber;
 const int EnumValue::kNumberFieldNumber;
@@ -2813,9 +2093,8 @@ const int EnumValue::kOptionsFieldNumber;
 
 EnumValue::EnumValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_EnumValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.EnumValue)
 }
@@ -2823,9 +2102,7 @@ EnumValue::EnumValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena),
   options_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_EnumValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.EnumValue)
@@ -2833,8 +2110,7 @@ EnumValue::EnumValue(::google::protobuf::Arena* arena)
 EnumValue::EnumValue(const EnumValue& from)
   : ::google::protobuf::Message(),
       _internal_metadata_(NULL),
-      options_(from.options_),
-      _cached_size_(0) {
+      options_(from.options_) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -2848,7 +2124,6 @@ EnumValue::EnumValue(const EnumValue& from)
 void EnumValue::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   number_ = 0;
-  _cached_size_ = 0;
 }
 
 EnumValue::~EnumValue() {
@@ -2857,12 +2132,8 @@ EnumValue::~EnumValue() {
 }
 
 void EnumValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
 void EnumValue::ArenaDtor(void* object) {
@@ -2872,29 +2143,29 @@ void EnumValue::ArenaDtor(void* object) {
 void EnumValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void EnumValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* EnumValue::descriptor() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[3].descriptor;
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const EnumValue& EnumValue::default_instance() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_EnumValue.base);
   return *internal_default_instance();
 }
 
-EnumValue* EnumValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<EnumValue>(arena);
-}
 
 void EnumValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.EnumValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   options_.Clear();
   name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   number_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool EnumValue::MergePartialFromCodedStream(
@@ -2903,18 +2174,18 @@ bool EnumValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.EnumValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.EnumValue.name"));
         } else {
@@ -2926,7 +2197,7 @@ bool EnumValue::MergePartialFromCodedStream(
       // int32 number = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(16u)) {
+            static_cast< ::google::protobuf::uint8>(16u /* 16 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -2940,25 +2211,22 @@ bool EnumValue::MergePartialFromCodedStream(
       // repeated .google.protobuf.Option options = 3;
       case 3: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(26u)) {
-          DO_(input->IncrementRecursionDepth());
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
+            static_cast< ::google::protobuf::uint8>(26u /* 26 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                 input, add_options()));
         } else {
           goto handle_unusual;
         }
-        input->UnsafeDecrementRecursionDepth();
         break;
       }
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2975,10 +2243,13 @@ failure:
 void EnumValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.EnumValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.EnumValue.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -2991,22 +2262,32 @@ void EnumValue::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      3, this->options(i), output);
+      3,
+      this->options(static_cast<int>(i)),
+      output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.EnumValue)
 }
 
 ::google::protobuf::uint8* EnumValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.EnumValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.EnumValue.name");
     target =
@@ -3020,12 +2301,17 @@ void EnumValue::SerializeWithCachedSizes(
   }
 
   // repeated .google.protobuf.Option options = 3;
-  for (unsigned int i = 0, n = this->options_size(); i < n; i++) {
+  for (unsigned int i = 0,
+      n = static_cast<unsigned int>(this->options_size()); i < n; i++) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        3, this->options(i), false, target);
+      InternalWriteMessageToArray(
+        3, this->options(static_cast<int>(i)), deterministic, target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.EnumValue)
   return target;
 }
@@ -3034,14 +2320,19 @@ size_t EnumValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.EnumValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // repeated .google.protobuf.Option options = 3;
   {
-    unsigned int count = this->options_size();
+    unsigned int count = static_cast<unsigned int>(this->options_size());
     total_size += 1UL * count;
     for (unsigned int i = 0; i < count; i++) {
       total_size +=
-        ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-          this->options(i));
+        ::google::protobuf::internal::WireFormatLite::MessageSize(
+          this->options(static_cast<int>(i)));
     }
   }
 
@@ -3060,9 +2351,7 @@ size_t EnumValue::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -3085,6 +2374,9 @@ void EnumValue::MergeFrom(const EnumValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.EnumValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   options_.MergeFrom(from.options_);
   if (from.name().size() > 0) {
     set_name(from.name());
@@ -3132,153 +2424,25 @@ void EnumValue::UnsafeArenaSwap(EnumValue* other) {
   InternalSwap(other);
 }
 void EnumValue::InternalSwap(EnumValue* other) {
-  options_.UnsafeArenaSwap(&other->options_);
-  name_.Swap(&other->name_);
-  std::swap(number_, other->number_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  CastToBase(&options_)->InternalSwap(CastToBase(&other->options_));
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(number_, other->number_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata EnumValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[3];
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// EnumValue
-
-// string name = 1;
-void EnumValue::clear_name() {
-  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& EnumValue::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValue.name)
-  return name_.Get();
-}
-void EnumValue::set_name(const ::std::string& value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumValue.name)
-}
-void EnumValue::set_name(const char* value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.EnumValue.name)
-}
-void EnumValue::set_name(const char* value,
-    size_t size) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.EnumValue.name)
-}
-::std::string* EnumValue::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValue.name)
-  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* EnumValue::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.EnumValue.name)
-  
-  return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* EnumValue::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumValue.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void EnumValue::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValue.name)
-}
-void EnumValue::unsafe_arena_set_allocated_name(
-    ::std::string* name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.EnumValue.name)
-}
-
-// int32 number = 2;
-void EnumValue::clear_number() {
-  number_ = 0;
-}
-::google::protobuf::int32 EnumValue::number() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValue.number)
-  return number_;
-}
-void EnumValue::set_number(::google::protobuf::int32 value) {
-  
-  number_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.EnumValue.number)
-}
-
-// repeated .google.protobuf.Option options = 3;
-int EnumValue::options_size() const {
-  return options_.size();
-}
-void EnumValue::clear_options() {
-  options_.Clear();
-}
-const ::google::protobuf::Option& EnumValue::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValue.options)
-  return options_.Get(index);
-}
-::google::protobuf::Option* EnumValue::mutable_options(int index) {
-  // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValue.options)
-  return options_.Mutable(index);
-}
-::google::protobuf::Option* EnumValue::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumValue.options)
-  return options_.Add();
-}
-::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
-EnumValue::mutable_options() {
-  // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumValue.options)
-  return &options_;
-}
-const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
-EnumValue::options() const {
-  // @@protoc_insertion_point(field_list:google.protobuf.EnumValue.options)
-  return options_;
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
-void Option::_slow_mutable_value() {
-  value_ = ::google::protobuf::Arena::Create< ::google::protobuf::Any >(
-      GetArenaNoVirtual());
-}
-::google::protobuf::Any* Option::_slow_release_value() {
-  if (value_ == NULL) {
-    return NULL;
-  } else {
-    ::google::protobuf::Any* temp = new ::google::protobuf::Any(*value_);
-    value_ = NULL;
-    return temp;
-  }
-}
-::google::protobuf::Any* Option::unsafe_arena_release_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Option.value)
-  
-  ::google::protobuf::Any* temp = value_;
-  value_ = NULL;
-  return temp;
+void Option::InitAsDefaultInstance() {
+  ::google::protobuf::_Option_default_instance_._instance.get_mutable()->value_ = const_cast< ::google::protobuf::Any*>(
+      ::google::protobuf::Any::internal_default_instance());
 }
 void Option::unsafe_arena_set_allocated_value(
     ::google::protobuf::Any* value) {
@@ -3293,6 +2457,12 @@ void Option::unsafe_arena_set_allocated_value(
   }
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Option.value)
 }
+void Option::clear_value() {
+  if (GetArenaNoVirtual() == NULL && value_ != NULL) {
+    delete value_;
+  }
+  value_ = NULL;
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Option::kNameFieldNumber;
 const int Option::kValueFieldNumber;
@@ -3300,26 +2470,22 @@ const int Option::kValueFieldNumber;
 
 Option::Option()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Option)
 }
 Option::Option(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Option)
 }
 Option::Option(const Option& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.name().size() > 0) {
@@ -3337,7 +2503,6 @@ Option::Option(const Option& from)
 void Option::SharedCtor() {
   name_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   value_ = NULL;
-  _cached_size_ = 0;
 }
 
 Option::~Option() {
@@ -3346,15 +2511,9 @@ Option::~Option() {
 }
 
 void Option::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  name_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
-  if (this != internal_default_instance()) {
-    delete value_;
-  }
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  name_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
+  if (this != internal_default_instance()) delete value_;
 }
 
 void Option::ArenaDtor(void* object) {
@@ -3364,31 +2523,31 @@ void Option::ArenaDtor(void* object) {
 void Option::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Option::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Option::descriptor() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[4].descriptor;
+  ::protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Option& Option::default_instance() {
-  protobuf_google_2fprotobuf_2ftype_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2ftype_2eproto::scc_info_Option.base);
   return *internal_default_instance();
 }
 
-Option* Option::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Option>(arena);
-}
 
 void Option::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Option)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
   if (GetArenaNoVirtual() == NULL && value_ != NULL) {
     delete value_;
   }
   value_ = NULL;
+  _internal_metadata_.Clear();
 }
 
 bool Option::MergePartialFromCodedStream(
@@ -3397,18 +2556,18 @@ bool Option::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Option)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string name = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_name()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->name().data(), this->name().length(),
+            this->name().data(), static_cast<int>(this->name().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.Option.name"));
         } else {
@@ -3420,8 +2579,8 @@ bool Option::MergePartialFromCodedStream(
       // .google.protobuf.Any value = 2;
       case 2: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(18u)) {
-          DO_(::google::protobuf::internal::WireFormatLite::ReadMessageNoVirtual(
+            static_cast< ::google::protobuf::uint8>(18u /* 18 & 0xFF */)) {
+          DO_(::google::protobuf::internal::WireFormatLite::ReadMessage(
                input, mutable_value()));
         } else {
           goto handle_unusual;
@@ -3431,12 +2590,11 @@ bool Option::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -3453,10 +2611,13 @@ failure:
 void Option::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Option)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Option.name");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
@@ -3466,20 +2627,27 @@ void Option::SerializeWithCachedSizes(
   // .google.protobuf.Any value = 2;
   if (this->has_value()) {
     ::google::protobuf::internal::WireFormatLite::WriteMessageMaybeToArray(
-      2, *this->value_, output);
+      2, this->_internal_value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Option)
 }
 
 ::google::protobuf::uint8* Option::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Option)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string name = 1;
   if (this->name().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->name().data(), this->name().length(),
+      this->name().data(), static_cast<int>(this->name().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.Option.name");
     target =
@@ -3490,10 +2658,14 @@ void Option::SerializeWithCachedSizes(
   // .google.protobuf.Any value = 2;
   if (this->has_value()) {
     target = ::google::protobuf::internal::WireFormatLite::
-      InternalWriteMessageNoVirtualToArray(
-        2, *this->value_, false, target);
+      InternalWriteMessageToArray(
+        2, this->_internal_value(), deterministic, target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Option)
   return target;
 }
@@ -3502,6 +2674,11 @@ size_t Option::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Option)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // string name = 1;
   if (this->name().size() > 0) {
     total_size += 1 +
@@ -3512,14 +2689,12 @@ size_t Option::ByteSizeLong() const {
   // .google.protobuf.Any value = 2;
   if (this->has_value()) {
     total_size += 1 +
-      ::google::protobuf::internal::WireFormatLite::MessageSizeNoVirtual(
-        *this->value_);
+      ::google::protobuf::internal::WireFormatLite::MessageSize(
+        *value_);
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -3542,6 +2717,9 @@ void Option::MergeFrom(const Option& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Option)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.name().size() > 0) {
     set_name(from.name());
   }
@@ -3588,140 +2766,39 @@ void Option::UnsafeArenaSwap(Option* other) {
   InternalSwap(other);
 }
 void Option::InternalSwap(Option* other) {
-  name_.Swap(&other->name_);
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  name_.Swap(&other->name_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Option::GetMetadata() const {
   protobuf_google_2fprotobuf_2ftype_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[4];
+  return ::protobuf_google_2fprotobuf_2ftype_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Option
-
-// string name = 1;
-void Option::clear_name() {
-  name_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& Option::name() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Option.name)
-  return name_.Get();
-}
-void Option::set_name(const ::std::string& value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.Option.name)
-}
-void Option::set_name(const char* value) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.Option.name)
-}
-void Option::set_name(const char* value,
-    size_t size) {
-  
-  name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.Option.name)
-}
-::std::string* Option::mutable_name() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Option.name)
-  return name_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Option::release_name() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Option.name)
-  
-  return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* Option::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Option.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void Option::set_allocated_name(::std::string* name) {
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), name,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Option.name)
-}
-void Option::unsafe_arena_set_allocated_name(
-    ::std::string* name) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (name != NULL) {
-    
-  } else {
-    
-  }
-  name_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      name, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.Option.name)
-}
 
-// .google.protobuf.Any value = 2;
-bool Option::has_value() const {
-  return this != internal_default_instance() && value_ != NULL;
-}
-void Option::clear_value() {
-  if (GetArenaNoVirtual() == NULL && value_ != NULL) delete value_;
-  value_ = NULL;
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Type* Arena::CreateMaybeMessage< ::google::protobuf::Type >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Type >(arena);
 }
-const ::google::protobuf::Any& Option::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Option.value)
-  return value_ != NULL ? *value_
-                         : *::google::protobuf::Any::internal_default_instance();
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Field* Arena::CreateMaybeMessage< ::google::protobuf::Field >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Field >(arena);
 }
-::google::protobuf::Any* Option::mutable_value() {
-  
-  if (value_ == NULL) {
-    _slow_mutable_value();
-  }
-  // @@protoc_insertion_point(field_mutable:google.protobuf.Option.value)
-  return value_;
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Enum* Arena::CreateMaybeMessage< ::google::protobuf::Enum >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Enum >(arena);
 }
-::google::protobuf::Any* Option::release_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Option.value)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_value();
-  } else {
-    ::google::protobuf::Any* temp = value_;
-    value_ = NULL;
-    return temp;
-  }
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::EnumValue* Arena::CreateMaybeMessage< ::google::protobuf::EnumValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::EnumValue >(arena);
 }
- void Option::set_allocated_value(::google::protobuf::Any* value) {
-  ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
-  if (message_arena == NULL) {
-    delete value_;
-  }
-  if (value != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(value);
-    }
-  }
-  value_ = value;
-  if (value) {
-    
-  } else {
-    
-  }
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.Option.value)
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Option* Arena::CreateMaybeMessage< ::google::protobuf::Option >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Option >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/type.pb.h b/src/google/protobuf/type.pb.h
index ae816008..69af6c2e 100644
--- a/src/google/protobuf/type.pb.h
+++ b/src/google/protobuf/type.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/type.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2ftype_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2ftype_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2ftype_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2ftype_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,7 +22,9 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
@@ -32,11 +34,22 @@
 #include <google/protobuf/any.pb.h>
 #include <google/protobuf/source_context.pb.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2ftype_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2ftype_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[5];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2ftype_2eproto
 namespace google {
 namespace protobuf {
-class Any;
-class AnyDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern AnyDefaultTypeInternal _Any_default_instance_;
 class Enum;
 class EnumDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern EnumDefaultTypeInternal _Enum_default_instance_;
@@ -49,28 +62,22 @@ LIBPROTOBUF_EXPORT extern FieldDefaultTypeInternal _Field_default_instance_;
 class Option;
 class OptionDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern OptionDefaultTypeInternal _Option_default_instance_;
-class SourceContext;
-class SourceContextDefaultTypeInternal;
-LIBPROTOBUF_EXPORT extern SourceContextDefaultTypeInternal _SourceContext_default_instance_;
 class Type;
 class TypeDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern TypeDefaultTypeInternal _Type_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2ftype_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2ftype_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Enum* Arena::CreateMaybeMessage<::google::protobuf::Enum>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::EnumValue* Arena::CreateMaybeMessage<::google::protobuf::EnumValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Field* Arena::CreateMaybeMessage<::google::protobuf::Field>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Option* Arena::CreateMaybeMessage<::google::protobuf::Option>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Type* Arena::CreateMaybeMessage<::google::protobuf::Type>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 enum Field_Kind {
   Field_Kind_TYPE_UNKNOWN = 0,
@@ -167,53 +174,73 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Type(Type&& from) noexcept
+    : Type() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Type& operator=(Type&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Type& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Type* internal_default_instance() {
     return reinterpret_cast<const Type*>(
                &_Type_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void UnsafeArenaSwap(Type* other);
   void Swap(Type* other);
+  friend void swap(Type& a, Type& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Type* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Type* New() const final {
+    return CreateMaybeMessage<Type>(NULL);
+  }
 
-  Type* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Type* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Type>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Type& from);
   void MergeFrom(const Type& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Type* other);
   protected:
   explicit Type(::google::protobuf::Arena* arena);
@@ -229,7 +256,7 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -239,11 +266,11 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   int fields_size() const;
   void clear_fields();
   static const int kFieldsFieldNumber = 2;
-  const ::google::protobuf::Field& fields(int index) const;
   ::google::protobuf::Field* mutable_fields(int index);
-  ::google::protobuf::Field* add_fields();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >*
       mutable_fields();
+  const ::google::protobuf::Field& fields(int index) const;
+  ::google::protobuf::Field* add_fields();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >&
       fields() const;
 
@@ -273,11 +300,11 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 4;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -286,12 +313,21 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   static const int kNameFieldNumber = 1;
   const ::std::string& name() const;
   void set_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_name(::std::string&& value);
+  #endif
   void set_name(const char* value);
   void set_name(const char* value, size_t size);
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_name(
       ::std::string* name);
 
@@ -300,16 +336,15 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   void clear_source_context();
   static const int kSourceContextFieldNumber = 5;
   private:
-  void _slow_mutable_source_context();
-  ::google::protobuf::SourceContext* _slow_release_source_context();
+  const ::google::protobuf::SourceContext& _internal_source_context() const;
   public:
   const ::google::protobuf::SourceContext& source_context() const;
-  ::google::protobuf::SourceContext* mutable_source_context();
   ::google::protobuf::SourceContext* release_source_context();
+  ::google::protobuf::SourceContext* mutable_source_context();
   void set_allocated_source_context(::google::protobuf::SourceContext* source_context);
-  ::google::protobuf::SourceContext* unsafe_arena_release_source_context();
   void unsafe_arena_set_allocated_source_context(
       ::google::protobuf::SourceContext* source_context);
+  ::google::protobuf::SourceContext* unsafe_arena_release_source_context();
 
   // .google.protobuf.Syntax syntax = 6;
   void clear_syntax();
@@ -321,7 +356,7 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field > fields_;
@@ -330,8 +365,8 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::SourceContext* source_context_;
   int syntax_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -346,53 +381,73 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Field(Field&& from) noexcept
+    : Field() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Field& operator=(Field&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Field& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Field* internal_default_instance() {
     return reinterpret_cast<const Field*>(
                &_Field_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
   void UnsafeArenaSwap(Field* other);
   void Swap(Field* other);
+  friend void swap(Field& a, Field& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Field* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Field* New() const final {
+    return CreateMaybeMessage<Field>(NULL);
+  }
 
-  Field* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Field* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Field>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Field& from);
   void MergeFrom(const Field& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Field* other);
   protected:
   explicit Field(::google::protobuf::Arena* arena);
@@ -408,7 +463,7 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -508,11 +563,11 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 9;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -521,12 +576,21 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   static const int kNameFieldNumber = 4;
   const ::std::string& name() const;
   void set_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_name(::std::string&& value);
+  #endif
   void set_name(const char* value);
   void set_name(const char* value, size_t size);
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_name(
       ::std::string* name);
 
@@ -535,12 +599,21 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   static const int kTypeUrlFieldNumber = 6;
   const ::std::string& type_url() const;
   void set_type_url(const ::std::string& value);
+  #if LANG_CXX11
+  void set_type_url(::std::string&& value);
+  #endif
   void set_type_url(const char* value);
   void set_type_url(const char* value, size_t size);
   ::std::string* mutable_type_url();
   ::std::string* release_type_url();
   void set_allocated_type_url(::std::string* type_url);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_type_url();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_type_url(
       ::std::string* type_url);
 
@@ -549,12 +622,21 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   static const int kJsonNameFieldNumber = 10;
   const ::std::string& json_name() const;
   void set_json_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_json_name(::std::string&& value);
+  #endif
   void set_json_name(const char* value);
   void set_json_name(const char* value, size_t size);
   ::std::string* mutable_json_name();
   ::std::string* release_json_name();
   void set_allocated_json_name(::std::string* json_name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_json_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_json_name(
       ::std::string* json_name);
 
@@ -563,12 +645,21 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   static const int kDefaultValueFieldNumber = 11;
   const ::std::string& default_value() const;
   void set_default_value(const ::std::string& value);
+  #if LANG_CXX11
+  void set_default_value(::std::string&& value);
+  #endif
   void set_default_value(const char* value);
   void set_default_value(const char* value, size_t size);
   ::std::string* mutable_default_value();
   ::std::string* release_default_value();
   void set_allocated_default_value(::std::string* default_value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_default_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_default_value(
       ::std::string* default_value);
 
@@ -606,7 +697,7 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option > options_;
@@ -619,8 +710,8 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
   ::google::protobuf::int32 number_;
   ::google::protobuf::int32 oneof_index_;
   bool packed_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -635,53 +726,73 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Enum(Enum&& from) noexcept
+    : Enum() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Enum& operator=(Enum&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Enum& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Enum* internal_default_instance() {
     return reinterpret_cast<const Enum*>(
                &_Enum_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
   void UnsafeArenaSwap(Enum* other);
   void Swap(Enum* other);
+  friend void swap(Enum& a, Enum& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Enum* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Enum* New() const final {
+    return CreateMaybeMessage<Enum>(NULL);
+  }
 
-  Enum* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Enum* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Enum>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Enum& from);
   void MergeFrom(const Enum& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Enum* other);
   protected:
   explicit Enum(::google::protobuf::Arena* arena);
@@ -697,7 +808,7 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -707,11 +818,11 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   int enumvalue_size() const;
   void clear_enumvalue();
   static const int kEnumvalueFieldNumber = 2;
-  const ::google::protobuf::EnumValue& enumvalue(int index) const;
   ::google::protobuf::EnumValue* mutable_enumvalue(int index);
-  ::google::protobuf::EnumValue* add_enumvalue();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >*
       mutable_enumvalue();
+  const ::google::protobuf::EnumValue& enumvalue(int index) const;
+  ::google::protobuf::EnumValue* add_enumvalue();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >&
       enumvalue() const;
 
@@ -719,11 +830,11 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -732,12 +843,21 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   static const int kNameFieldNumber = 1;
   const ::std::string& name() const;
   void set_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_name(::std::string&& value);
+  #endif
   void set_name(const char* value);
   void set_name(const char* value, size_t size);
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_name(
       ::std::string* name);
 
@@ -746,16 +866,15 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   void clear_source_context();
   static const int kSourceContextFieldNumber = 4;
   private:
-  void _slow_mutable_source_context();
-  ::google::protobuf::SourceContext* _slow_release_source_context();
+  const ::google::protobuf::SourceContext& _internal_source_context() const;
   public:
   const ::google::protobuf::SourceContext& source_context() const;
-  ::google::protobuf::SourceContext* mutable_source_context();
   ::google::protobuf::SourceContext* release_source_context();
+  ::google::protobuf::SourceContext* mutable_source_context();
   void set_allocated_source_context(::google::protobuf::SourceContext* source_context);
-  ::google::protobuf::SourceContext* unsafe_arena_release_source_context();
   void unsafe_arena_set_allocated_source_context(
       ::google::protobuf::SourceContext* source_context);
+  ::google::protobuf::SourceContext* unsafe_arena_release_source_context();
 
   // .google.protobuf.Syntax syntax = 5;
   void clear_syntax();
@@ -767,7 +886,7 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue > enumvalue_;
@@ -775,8 +894,8 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::SourceContext* source_context_;
   int syntax_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -791,53 +910,73 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  EnumValue(EnumValue&& from) noexcept
+    : EnumValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline EnumValue& operator=(EnumValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const EnumValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const EnumValue* internal_default_instance() {
     return reinterpret_cast<const EnumValue*>(
                &_EnumValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    3;
 
   void UnsafeArenaSwap(EnumValue* other);
   void Swap(EnumValue* other);
+  friend void swap(EnumValue& a, EnumValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline EnumValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline EnumValue* New() const final {
+    return CreateMaybeMessage<EnumValue>(NULL);
+  }
 
-  EnumValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  EnumValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<EnumValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const EnumValue& from);
   void MergeFrom(const EnumValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(EnumValue* other);
   protected:
   explicit EnumValue(::google::protobuf::Arena* arena);
@@ -853,7 +992,7 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -863,11 +1002,11 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
   int options_size() const;
   void clear_options();
   static const int kOptionsFieldNumber = 3;
-  const ::google::protobuf::Option& options(int index) const;
   ::google::protobuf::Option* mutable_options(int index);
-  ::google::protobuf::Option* add_options();
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
       mutable_options();
+  const ::google::protobuf::Option& options(int index) const;
+  ::google::protobuf::Option* add_options();
   const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
       options() const;
 
@@ -876,12 +1015,21 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
   static const int kNameFieldNumber = 1;
   const ::std::string& name() const;
   void set_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_name(::std::string&& value);
+  #endif
   void set_name(const char* value);
   void set_name(const char* value, size_t size);
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_name(
       ::std::string* name);
 
@@ -895,14 +1043,14 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option > options_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::int32 number_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -917,53 +1065,73 @@ class LIBPROTOBUF_EXPORT Option : public ::google::protobuf::Message /* @@protoc
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Option(Option&& from) noexcept
+    : Option() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Option& operator=(Option&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Option& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Option* internal_default_instance() {
     return reinterpret_cast<const Option*>(
                &_Option_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    4;
 
   void UnsafeArenaSwap(Option* other);
   void Swap(Option* other);
+  friend void swap(Option& a, Option& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Option* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Option* New() const final {
+    return CreateMaybeMessage<Option>(NULL);
+  }
 
-  Option* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Option* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Option>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Option& from);
   void MergeFrom(const Option& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Option* other);
   protected:
   explicit Option(::google::protobuf::Arena* arena);
@@ -979,7 +1147,7 @@ class LIBPROTOBUF_EXPORT Option : public ::google::protobuf::Message /* @@protoc
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -990,12 +1158,21 @@ class LIBPROTOBUF_EXPORT Option : public ::google::protobuf::Message /* @@protoc
   static const int kNameFieldNumber = 1;
   const ::std::string& name() const;
   void set_name(const ::std::string& value);
+  #if LANG_CXX11
+  void set_name(::std::string&& value);
+  #endif
   void set_name(const char* value);
   void set_name(const char* value, size_t size);
   ::std::string* mutable_name();
   ::std::string* release_name();
   void set_allocated_name(::std::string* name);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_name();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_name(
       ::std::string* name);
 
@@ -1004,35 +1181,37 @@ class LIBPROTOBUF_EXPORT Option : public ::google::protobuf::Message /* @@protoc
   void clear_value();
   static const int kValueFieldNumber = 2;
   private:
-  void _slow_mutable_value();
-  ::google::protobuf::Any* _slow_release_value();
+  const ::google::protobuf::Any& _internal_value() const;
   public:
   const ::google::protobuf::Any& value() const;
-  ::google::protobuf::Any* mutable_value();
   ::google::protobuf::Any* release_value();
+  ::google::protobuf::Any* mutable_value();
   void set_allocated_value(::google::protobuf::Any* value);
-  ::google::protobuf::Any* unsafe_arena_release_value();
   void unsafe_arena_set_allocated_value(
       ::google::protobuf::Any* value);
+  ::google::protobuf::Any* unsafe_arena_release_value();
 
   // @@protoc_insertion_point(class_scope:google.protobuf.Option)
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::internal::ArenaStringPtr name_;
   ::google::protobuf::Any* value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2ftype_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // Type
 
 // string name = 1;
@@ -1048,7 +1227,16 @@ inline void Type::set_name(const ::std::string& value) {
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Type.name)
 }
+#if LANG_CXX11
+inline void Type::set_name(::std::string&& value) {
+  
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Type.name)
+}
+#endif
 inline void Type::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1071,13 +1259,6 @@ inline ::std::string* Type::release_name() {
   
   return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Type::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Type.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Type::set_allocated_name(::std::string* name) {
   if (name != NULL) {
     
@@ -1088,6 +1269,13 @@ inline void Type::set_allocated_name(::std::string* name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Type.name)
 }
+inline ::std::string* Type::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Type.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Type::unsafe_arena_set_allocated_name(
     ::std::string* name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1108,23 +1296,23 @@ inline int Type::fields_size() const {
 inline void Type::clear_fields() {
   fields_.Clear();
 }
-inline const ::google::protobuf::Field& Type::fields(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.fields)
-  return fields_.Get(index);
-}
 inline ::google::protobuf::Field* Type::mutable_fields(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Type.fields)
   return fields_.Mutable(index);
 }
-inline ::google::protobuf::Field* Type::add_fields() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.fields)
-  return fields_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >*
 Type::mutable_fields() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Type.fields)
   return &fields_;
 }
+inline const ::google::protobuf::Field& Type::fields(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Type.fields)
+  return fields_.Get(index);
+}
+inline ::google::protobuf::Field* Type::add_fields() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Type.fields)
+  return fields_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Field >&
 Type::fields() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Type.fields)
@@ -1157,6 +1345,7 @@ inline void Type::set_oneofs(int index, ::std::string&& value) {
 }
 #endif
 inline void Type::set_oneofs(int index, const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   oneofs_.Mutable(index)->assign(value);
   // @@protoc_insertion_point(field_set_char:google.protobuf.Type.oneofs)
 }
@@ -1175,11 +1364,12 @@ inline void Type::add_oneofs(const ::std::string& value) {
 }
 #if LANG_CXX11
 inline void Type::add_oneofs(::std::string&& value) {
-  oneofs_.Add()->assign(std::move(value));
+  oneofs_.Add(std::move(value));
   // @@protoc_insertion_point(field_add:google.protobuf.Type.oneofs)
 }
 #endif
 inline void Type::add_oneofs(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   oneofs_.Add()->assign(value);
   // @@protoc_insertion_point(field_add_char:google.protobuf.Type.oneofs)
 }
@@ -1205,23 +1395,23 @@ inline int Type::options_size() const {
 inline void Type::clear_options() {
   options_.Clear();
 }
-inline const ::google::protobuf::Option& Type::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Type.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* Type::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Type.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* Type::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Type.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 Type::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Type.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& Type::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Type.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* Type::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Type.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 Type::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Type.options)
@@ -1232,50 +1422,57 @@ Type::options() const {
 inline bool Type::has_source_context() const {
   return this != internal_default_instance() && source_context_ != NULL;
 }
-inline void Type::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
+inline const ::google::protobuf::SourceContext& Type::_internal_source_context() const {
+  return *source_context_;
 }
 inline const ::google::protobuf::SourceContext& Type::source_context() const {
+  const ::google::protobuf::SourceContext* p = source_context_;
   // @@protoc_insertion_point(field_get:google.protobuf.Type.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::SourceContext*>(
+      &::google::protobuf::_SourceContext_default_instance_);
+}
+inline ::google::protobuf::SourceContext* Type::release_source_context() {
+  // @@protoc_insertion_point(field_release:google.protobuf.Type.source_context)
+  
+  ::google::protobuf::SourceContext* temp = source_context_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  source_context_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::SourceContext* Type::unsafe_arena_release_source_context() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Type.source_context)
+  
+  ::google::protobuf::SourceContext* temp = source_context_;
+  source_context_ = NULL;
+  return temp;
 }
 inline ::google::protobuf::SourceContext* Type::mutable_source_context() {
   
   if (source_context_ == NULL) {
-    _slow_mutable_source_context();
+    auto* p = CreateMaybeMessage<::google::protobuf::SourceContext>(GetArenaNoVirtual());
+    source_context_ = p;
   }
   // @@protoc_insertion_point(field_mutable:google.protobuf.Type.source_context)
   return source_context_;
 }
-inline ::google::protobuf::SourceContext* Type::release_source_context() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Type.source_context)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_source_context();
-  } else {
-    ::google::protobuf::SourceContext* temp = source_context_;
-    source_context_ = NULL;
-    return temp;
-  }
-}
-inline  void Type::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
+inline void Type::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
   ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
   if (message_arena == NULL) {
-    delete source_context_;
+    delete reinterpret_cast< ::google::protobuf::MessageLite*>(source_context_);
   }
-  if (source_context != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(source_context);
-    }
-  }
-  source_context_ = source_context;
   if (source_context) {
+    ::google::protobuf::Arena* submessage_arena = NULL;
+    if (message_arena != submessage_arena) {
+      source_context = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, source_context, submessage_arena);
+    }
     
   } else {
     
   }
+  source_context_ = source_context;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Type.source_context)
 }
 
@@ -1352,7 +1549,16 @@ inline void Field::set_name(const ::std::string& value) {
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Field.name)
 }
+#if LANG_CXX11
+inline void Field::set_name(::std::string&& value) {
+  
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Field.name)
+}
+#endif
 inline void Field::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1375,13 +1581,6 @@ inline ::std::string* Field::release_name() {
   
   return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Field::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Field::set_allocated_name(::std::string* name) {
   if (name != NULL) {
     
@@ -1392,6 +1591,13 @@ inline void Field::set_allocated_name(::std::string* name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.name)
 }
+inline ::std::string* Field::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Field::unsafe_arena_set_allocated_name(
     ::std::string* name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1418,7 +1624,16 @@ inline void Field::set_type_url(const ::std::string& value) {
   type_url_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Field.type_url)
 }
+#if LANG_CXX11
+inline void Field::set_type_url(::std::string&& value) {
+  
+  type_url_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Field.type_url)
+}
+#endif
 inline void Field::set_type_url(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   type_url_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1441,13 +1656,6 @@ inline ::std::string* Field::release_type_url() {
   
   return type_url_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Field::unsafe_arena_release_type_url() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.type_url)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return type_url_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Field::set_allocated_type_url(::std::string* type_url) {
   if (type_url != NULL) {
     
@@ -1458,6 +1666,13 @@ inline void Field::set_allocated_type_url(::std::string* type_url) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.type_url)
 }
+inline ::std::string* Field::unsafe_arena_release_type_url() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.type_url)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return type_url_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Field::unsafe_arena_set_allocated_type_url(
     ::std::string* type_url) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1506,23 +1721,23 @@ inline int Field::options_size() const {
 inline void Field::clear_options() {
   options_.Clear();
 }
-inline const ::google::protobuf::Option& Field::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Field.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* Field::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Field.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* Field::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Field.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 Field::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Field.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& Field::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Field.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* Field::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Field.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 Field::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Field.options)
@@ -1542,7 +1757,16 @@ inline void Field::set_json_name(const ::std::string& value) {
   json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Field.json_name)
 }
+#if LANG_CXX11
+inline void Field::set_json_name(::std::string&& value) {
+  
+  json_name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Field.json_name)
+}
+#endif
 inline void Field::set_json_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   json_name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1565,13 +1789,6 @@ inline ::std::string* Field::release_json_name() {
   
   return json_name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Field::unsafe_arena_release_json_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.json_name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return json_name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Field::set_allocated_json_name(::std::string* json_name) {
   if (json_name != NULL) {
     
@@ -1582,6 +1799,13 @@ inline void Field::set_allocated_json_name(::std::string* json_name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.json_name)
 }
+inline ::std::string* Field::unsafe_arena_release_json_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.json_name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return json_name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Field::unsafe_arena_set_allocated_json_name(
     ::std::string* json_name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1608,7 +1832,16 @@ inline void Field::set_default_value(const ::std::string& value) {
   default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Field.default_value)
 }
+#if LANG_CXX11
+inline void Field::set_default_value(::std::string&& value) {
+  
+  default_value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Field.default_value)
+}
+#endif
 inline void Field::set_default_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   default_value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1631,13 +1864,6 @@ inline ::std::string* Field::release_default_value() {
   
   return default_value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Field::unsafe_arena_release_default_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.default_value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return default_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Field::set_allocated_default_value(::std::string* default_value) {
   if (default_value != NULL) {
     
@@ -1648,6 +1874,13 @@ inline void Field::set_allocated_default_value(::std::string* default_value) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Field.default_value)
 }
+inline ::std::string* Field::unsafe_arena_release_default_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Field.default_value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return default_value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Field::unsafe_arena_set_allocated_default_value(
     ::std::string* default_value) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1678,7 +1911,16 @@ inline void Enum::set_name(const ::std::string& value) {
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Enum.name)
 }
+#if LANG_CXX11
+inline void Enum::set_name(::std::string&& value) {
+  
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Enum.name)
+}
+#endif
 inline void Enum::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1701,13 +1943,6 @@ inline ::std::string* Enum::release_name() {
   
   return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Enum::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Enum.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Enum::set_allocated_name(::std::string* name) {
   if (name != NULL) {
     
@@ -1718,6 +1953,13 @@ inline void Enum::set_allocated_name(::std::string* name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Enum.name)
 }
+inline ::std::string* Enum::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Enum.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Enum::unsafe_arena_set_allocated_name(
     ::std::string* name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1738,23 +1980,23 @@ inline int Enum::enumvalue_size() const {
 inline void Enum::clear_enumvalue() {
   enumvalue_.Clear();
 }
-inline const ::google::protobuf::EnumValue& Enum::enumvalue(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.enumvalue)
-  return enumvalue_.Get(index);
-}
 inline ::google::protobuf::EnumValue* Enum::mutable_enumvalue(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.enumvalue)
   return enumvalue_.Mutable(index);
 }
-inline ::google::protobuf::EnumValue* Enum::add_enumvalue() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Enum.enumvalue)
-  return enumvalue_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >*
 Enum::mutable_enumvalue() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Enum.enumvalue)
   return &enumvalue_;
 }
+inline const ::google::protobuf::EnumValue& Enum::enumvalue(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Enum.enumvalue)
+  return enumvalue_.Get(index);
+}
+inline ::google::protobuf::EnumValue* Enum::add_enumvalue() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Enum.enumvalue)
+  return enumvalue_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::EnumValue >&
 Enum::enumvalue() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Enum.enumvalue)
@@ -1768,23 +2010,23 @@ inline int Enum::options_size() const {
 inline void Enum::clear_options() {
   options_.Clear();
 }
-inline const ::google::protobuf::Option& Enum::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Enum.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* Enum::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* Enum::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.Enum.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 Enum::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.Enum.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& Enum::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.Enum.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* Enum::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.Enum.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 Enum::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.Enum.options)
@@ -1795,50 +2037,57 @@ Enum::options() const {
 inline bool Enum::has_source_context() const {
   return this != internal_default_instance() && source_context_ != NULL;
 }
-inline void Enum::clear_source_context() {
-  if (GetArenaNoVirtual() == NULL && source_context_ != NULL) delete source_context_;
-  source_context_ = NULL;
+inline const ::google::protobuf::SourceContext& Enum::_internal_source_context() const {
+  return *source_context_;
 }
 inline const ::google::protobuf::SourceContext& Enum::source_context() const {
+  const ::google::protobuf::SourceContext* p = source_context_;
   // @@protoc_insertion_point(field_get:google.protobuf.Enum.source_context)
-  return source_context_ != NULL ? *source_context_
-                         : *::google::protobuf::SourceContext::internal_default_instance();
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::SourceContext*>(
+      &::google::protobuf::_SourceContext_default_instance_);
+}
+inline ::google::protobuf::SourceContext* Enum::release_source_context() {
+  // @@protoc_insertion_point(field_release:google.protobuf.Enum.source_context)
+  
+  ::google::protobuf::SourceContext* temp = source_context_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  source_context_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::SourceContext* Enum::unsafe_arena_release_source_context() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Enum.source_context)
+  
+  ::google::protobuf::SourceContext* temp = source_context_;
+  source_context_ = NULL;
+  return temp;
 }
 inline ::google::protobuf::SourceContext* Enum::mutable_source_context() {
   
   if (source_context_ == NULL) {
-    _slow_mutable_source_context();
+    auto* p = CreateMaybeMessage<::google::protobuf::SourceContext>(GetArenaNoVirtual());
+    source_context_ = p;
   }
   // @@protoc_insertion_point(field_mutable:google.protobuf.Enum.source_context)
   return source_context_;
 }
-inline ::google::protobuf::SourceContext* Enum::release_source_context() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Enum.source_context)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_source_context();
-  } else {
-    ::google::protobuf::SourceContext* temp = source_context_;
-    source_context_ = NULL;
-    return temp;
-  }
-}
-inline  void Enum::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
+inline void Enum::set_allocated_source_context(::google::protobuf::SourceContext* source_context) {
   ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
   if (message_arena == NULL) {
-    delete source_context_;
+    delete reinterpret_cast< ::google::protobuf::MessageLite*>(source_context_);
   }
-  if (source_context != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(source_context);
-    }
-  }
-  source_context_ = source_context;
   if (source_context) {
+    ::google::protobuf::Arena* submessage_arena = NULL;
+    if (message_arena != submessage_arena) {
+      source_context = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, source_context, submessage_arena);
+    }
     
   } else {
     
   }
+  source_context_ = source_context;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Enum.source_context)
 }
 
@@ -1873,7 +2122,16 @@ inline void EnumValue::set_name(const ::std::string& value) {
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.EnumValue.name)
 }
+#if LANG_CXX11
+inline void EnumValue::set_name(::std::string&& value) {
+  
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.EnumValue.name)
+}
+#endif
 inline void EnumValue::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1896,13 +2154,6 @@ inline ::std::string* EnumValue::release_name() {
   
   return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* EnumValue::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumValue.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void EnumValue::set_allocated_name(::std::string* name) {
   if (name != NULL) {
     
@@ -1913,6 +2164,13 @@ inline void EnumValue::set_allocated_name(::std::string* name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.EnumValue.name)
 }
+inline ::std::string* EnumValue::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.EnumValue.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void EnumValue::unsafe_arena_set_allocated_name(
     ::std::string* name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1947,23 +2205,23 @@ inline int EnumValue::options_size() const {
 inline void EnumValue::clear_options() {
   options_.Clear();
 }
-inline const ::google::protobuf::Option& EnumValue::options(int index) const {
-  // @@protoc_insertion_point(field_get:google.protobuf.EnumValue.options)
-  return options_.Get(index);
-}
 inline ::google::protobuf::Option* EnumValue::mutable_options(int index) {
   // @@protoc_insertion_point(field_mutable:google.protobuf.EnumValue.options)
   return options_.Mutable(index);
 }
-inline ::google::protobuf::Option* EnumValue::add_options() {
-  // @@protoc_insertion_point(field_add:google.protobuf.EnumValue.options)
-  return options_.Add();
-}
 inline ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >*
 EnumValue::mutable_options() {
   // @@protoc_insertion_point(field_mutable_list:google.protobuf.EnumValue.options)
   return &options_;
 }
+inline const ::google::protobuf::Option& EnumValue::options(int index) const {
+  // @@protoc_insertion_point(field_get:google.protobuf.EnumValue.options)
+  return options_.Get(index);
+}
+inline ::google::protobuf::Option* EnumValue::add_options() {
+  // @@protoc_insertion_point(field_add:google.protobuf.EnumValue.options)
+  return options_.Add();
+}
 inline const ::google::protobuf::RepeatedPtrField< ::google::protobuf::Option >&
 EnumValue::options() const {
   // @@protoc_insertion_point(field_list:google.protobuf.EnumValue.options)
@@ -1987,7 +2245,16 @@ inline void Option::set_name(const ::std::string& value) {
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.Option.name)
 }
+#if LANG_CXX11
+inline void Option::set_name(::std::string&& value) {
+  
+  name_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.Option.name)
+}
+#endif
 inline void Option::set_name(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   name_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -2010,13 +2277,6 @@ inline ::std::string* Option::release_name() {
   
   return name_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* Option::unsafe_arena_release_name() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Option.name)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void Option::set_allocated_name(::std::string* name) {
   if (name != NULL) {
     
@@ -2027,6 +2287,13 @@ inline void Option::set_allocated_name(::std::string* name) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Option.name)
 }
+inline ::std::string* Option::unsafe_arena_release_name() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Option.name)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return name_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void Option::unsafe_arena_set_allocated_name(
     ::std::string* name) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -2044,54 +2311,63 @@ inline void Option::unsafe_arena_set_allocated_name(
 inline bool Option::has_value() const {
   return this != internal_default_instance() && value_ != NULL;
 }
-inline void Option::clear_value() {
-  if (GetArenaNoVirtual() == NULL && value_ != NULL) delete value_;
-  value_ = NULL;
+inline const ::google::protobuf::Any& Option::_internal_value() const {
+  return *value_;
 }
 inline const ::google::protobuf::Any& Option::value() const {
+  const ::google::protobuf::Any* p = value_;
   // @@protoc_insertion_point(field_get:google.protobuf.Option.value)
-  return value_ != NULL ? *value_
-                         : *::google::protobuf::Any::internal_default_instance();
+  return p != NULL ? *p : *reinterpret_cast<const ::google::protobuf::Any*>(
+      &::google::protobuf::_Any_default_instance_);
+}
+inline ::google::protobuf::Any* Option::release_value() {
+  // @@protoc_insertion_point(field_release:google.protobuf.Option.value)
+  
+  ::google::protobuf::Any* temp = value_;
+  if (GetArenaNoVirtual() != NULL) {
+    temp = ::google::protobuf::internal::DuplicateIfNonNull(temp);
+  }
+  value_ = NULL;
+  return temp;
+}
+inline ::google::protobuf::Any* Option::unsafe_arena_release_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.Option.value)
+  
+  ::google::protobuf::Any* temp = value_;
+  value_ = NULL;
+  return temp;
 }
 inline ::google::protobuf::Any* Option::mutable_value() {
   
   if (value_ == NULL) {
-    _slow_mutable_value();
+    auto* p = CreateMaybeMessage<::google::protobuf::Any>(GetArenaNoVirtual());
+    value_ = p;
   }
   // @@protoc_insertion_point(field_mutable:google.protobuf.Option.value)
   return value_;
 }
-inline ::google::protobuf::Any* Option::release_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.Option.value)
-  
-  if (GetArenaNoVirtual() != NULL) {
-    return _slow_release_value();
-  } else {
-    ::google::protobuf::Any* temp = value_;
-    value_ = NULL;
-    return temp;
-  }
-}
-inline  void Option::set_allocated_value(::google::protobuf::Any* value) {
+inline void Option::set_allocated_value(::google::protobuf::Any* value) {
   ::google::protobuf::Arena* message_arena = GetArenaNoVirtual();
   if (message_arena == NULL) {
-    delete value_;
+    delete reinterpret_cast< ::google::protobuf::MessageLite*>(value_);
   }
-  if (value != NULL) {
-    if (message_arena != NULL) {
-      message_arena->Own(value);
-    }
-  }
-  value_ = value;
   if (value) {
+    ::google::protobuf::Arena* submessage_arena = NULL;
+    if (message_arena != submessage_arena) {
+      value = ::google::protobuf::internal::GetOwnedMessage(
+          message_arena, value, submessage_arena);
+    }
     
   } else {
     
   }
+  value_ = value;
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.Option.value)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -2103,25 +2379,23 @@ inline  void Option::set_allocated_value(::google::protobuf::Any* value) {
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
-#ifndef SWIG
 namespace google {
 namespace protobuf {
 
-template <> struct is_proto_enum< ::google::protobuf::Field_Kind> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::Field_Kind> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::Field_Kind>() {
   return ::google::protobuf::Field_Kind_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::Field_Cardinality> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::Field_Cardinality> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::Field_Cardinality>() {
   return ::google::protobuf::Field_Cardinality_descriptor();
 }
-template <> struct is_proto_enum< ::google::protobuf::Syntax> : ::google::protobuf::internal::true_type {};
+template <> struct is_proto_enum< ::google::protobuf::Syntax> : ::std::true_type {};
 template <>
 inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::Syntax>() {
   return ::google::protobuf::Syntax_descriptor();
@@ -2129,8 +2403,7 @@ inline const EnumDescriptor* GetEnumDescriptor< ::google::protobuf::Syntax>() {
 
 }  // namespace protobuf
 }  // namespace google
-#endif  // SWIG
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2ftype_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2ftype_2eproto
diff --git a/src/google/protobuf/unittest.proto b/src/google/protobuf/unittest.proto
index 96289cc5..4af2b051 100644
--- a/src/google/protobuf/unittest.proto
+++ b/src/google/protobuf/unittest.proto
@@ -33,6 +33,8 @@
 //  Sanjay Ghemawat, Jeff Dean, and others.
 //
 // A proto file we will use for unit testing.
+//
+// LINT: ALLOW_GROUPS, LEGACY_NAMES
 
 syntax = "proto2";
 
@@ -189,6 +191,13 @@ message NestedTestAllTypes {
 
 message TestDeprecatedFields {
   optional int32 deprecated_int32 = 1 [deprecated=true];
+  oneof oneof_fields {
+    int32 deprecated_int32_in_oneof = 2 [deprecated=true];
+  }
+}
+
+message TestDeprecatedMessage {
+  option deprecated = true;
 }
 
 // Define these after TestAllTypes to make sure the compiler can handle
@@ -326,6 +335,17 @@ extend TestAllExtensions {
   optional bytes oneof_bytes_extension = 114;
 }
 
+message TestGroup {
+  optional group OptionalGroup = 16 {
+    optional int32 a = 17;
+  }
+  optional ForeignEnum optional_foreign_enum = 22;
+}
+
+message TestGroupExtension {
+  extensions 1 to max;
+}
+
 message TestNestedExtension {
   extend TestAllExtensions {
     // Check for bug where string extensions declared in tested scope did not
@@ -335,6 +355,13 @@ message TestNestedExtension {
     // underscores.
     optional string nested_string_extension = 1003;
   }
+
+  extend TestGroupExtension {
+    optional group OptionalGroup_extension = 16 {
+      optional int32 a = 17;
+    }
+    optional ForeignEnum optional_foreign_enum_extension = 22;
+  }
 }
 
 // We have separate messages for testing required fields because it's
@@ -393,6 +420,12 @@ message TestRequiredForeign {
   optional int32 dummy = 3;
 }
 
+message TestRequiredMessage {
+  optional TestRequired optional_message = 1;
+  repeated TestRequired repeated_message = 2;
+  required TestRequired required_message = 3;
+}
+
 // Test that we can use NestedMessage from outside TestAllTypes.
 message TestForeignNested {
   optional TestAllTypes.NestedMessage foreign_nested = 1;
@@ -429,7 +462,14 @@ message TestRecursiveMessage {
 
 // Test that mutual recursion works.
 message TestMutualRecursionA {
+  message SubMessage {
+    optional TestMutualRecursionB b = 1;
+  }
   optional TestMutualRecursionB bb = 1;
+  optional group SubGroup = 2 {
+    optional SubMessage sub_message = 3;  // Needed because of bug in javatest
+    optional TestAllTypes not_in_this_scc = 4;
+  }
 }
 
 message TestMutualRecursionB {
@@ -437,6 +477,15 @@ message TestMutualRecursionB {
   optional int32 optional_int32 = 2;
 }
 
+message TestIsInitialized {
+  message SubMessage {
+    optional group SubGroup = 1 {
+      required int32 i = 2;
+    }
+  }
+  optional SubMessage sub_message = 1;
+}
+
 // Test that groups have disjoint field numbers from their siblings and
 // parents.  This is NOT possible in proto1; only google.protobuf.  When attempting
 // to compile with proto1, this will emit an error; so we only include it
@@ -525,12 +574,30 @@ message TestFieldOrderings {
   optional NestedMessage optional_nested_message  = 200;
 }
 
-
 extend TestFieldOrderings {
   optional string my_extension_string = 50;
   optional int32 my_extension_int = 5;
 }
 
+message TestExtensionOrderings1 {
+  extend TestFieldOrderings {
+    optional TestExtensionOrderings1 test_ext_orderings1 = 13;
+  }
+  optional string my_string = 1;
+}
+
+message TestExtensionOrderings2 {
+  extend TestFieldOrderings {
+    optional TestExtensionOrderings2 test_ext_orderings2 = 12;
+  }
+  message TestExtensionOrderings3 {
+    extend TestFieldOrderings {
+      optional TestExtensionOrderings3 test_ext_orderings3 = 14;
+    }
+    optional string my_string = 1;
+  }
+  optional string my_string = 1;
+}
 
 message TestExtremeDefaultValues {
   optional bytes escaped_bytes = 1 [default = "\0\001\a\b\f\n\r\t\v\\\'\"\xfe"];
@@ -917,3 +984,21 @@ message TestHugeFieldNumbers {
 extend TestHugeFieldNumbers {
   optional TestAllTypes test_all_types = 536860000;
 }
+
+message TestExtensionInsideTable {
+  optional int32 field1 = 1;
+  optional int32 field2 = 2;
+  optional int32 field3 = 3;
+  optional int32 field4 = 4;
+  extensions 5 to 5;
+  optional int32 field6 = 6;
+  optional int32 field7 = 7;
+  optional int32 field8 = 8;
+  optional int32 field9 = 9;
+  optional int32 field10 = 10;
+}
+
+extend TestExtensionInsideTable {
+  optional int32 test_extension_inside_table_extension = 5;
+}
+
diff --git a/src/google/protobuf/compiler/javanano/javanano_enum.h b/src/google/protobuf/unittest_lazy_dependencies.proto
index 10dd3648..2f5efd2a 100644
--- a/src/google/protobuf/compiler/javanano/javanano_enum.h
+++ b/src/google/protobuf/unittest_lazy_dependencies.proto
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,60 +28,48 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
+// Author: trafacz@google.com (Todd Rafacz)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// A proto file we will use for unit testing.
 
-#ifndef GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__
-#define GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__
-
-#include <string>
-#include <vector>
-
-#include <google/protobuf/compiler/javanano/javanano_params.h>
-#include <google/protobuf/descriptor.h>
-
-namespace google {
-namespace protobuf {
-  namespace io {
-    class Printer;             // printer.h
-  }
-}
+syntax = "proto2";
 
-namespace protobuf {
-namespace compiler {
-namespace javanano {
+import "google/protobuf/unittest_lazy_dependencies_custom_option.proto";
 
-class EnumGenerator {
- public:
-  explicit EnumGenerator(const EnumDescriptor* descriptor, const Params& params);
-  ~EnumGenerator();
+// Some generic_services option(s) added automatically.
+// See:  http://go/proto2-generic-services-default
+option cc_generic_services = true;   // auto-added
+option java_generic_services = true; // auto-added
+option py_generic_services = true;   // auto-added
+option cc_enable_arenas = true;
 
-  void Generate(io::Printer* printer);
+// We don't put this in a package within proto2 because we need to make sure
+// that the generated code doesn't depend on being in the proto2 namespace.
+// In test_util.h we do "using namespace unittest = protobuf_unittest".
+package protobuf_unittest.lazy_imports;
 
- private:
-  const Params& params_;
-  const EnumDescriptor* descriptor_;
+// Protos optimized for SPEED use a strict superset of the generated code
+// of equivalent ones optimized for CODE_SIZE, so we should optimize all our
+// tests for speed unless explicitly testing code size optimization.
+option optimize_for = SPEED;
 
-  // The proto language allows multiple enum constants to have the same numeric
-  // value.  Java, however, does not allow multiple enum constants to be
-  // considered equivalent.  We treat the first defined constant for any
-  // given numeric value as "canonical" and the rest as aliases of that
-  // canonical value.
-  vector<const EnumValueDescriptor*> canonical_values_;
+option java_outer_classname = "UnittestLazyImportsProto";
 
-  struct Alias {
-    const EnumValueDescriptor* value;
-    const EnumValueDescriptor* canonical_value;
-  };
-  vector<Alias> aliases_;
+// The following are used to test that the proto file
+// with the definition of the following field types is
+// not built when this proto file is built. Then test
+// that calling message_type() etc will build the correct
+// descriptor lazily and return it.
 
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumGenerator);
-};
+message ImportedMessage {
+  optional LazyMessage lazy_message = 1;
+}
 
-}  // namespace javanano
-}  // namespace compiler
-}  // namespace protobuf
+message MessageCustomOption {
+}
 
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_JAVANANO_ENUM_H__
+message MessageCustomOption2 {
+  option (lazy_enum_option) = LAZY_ENUM_0;
+}
diff --git a/src/google/protobuf/unittest_lazy_dependencies_custom_option.proto b/src/google/protobuf/unittest_lazy_dependencies_custom_option.proto
new file mode 100644
index 00000000..22438257
--- /dev/null
+++ b/src/google/protobuf/unittest_lazy_dependencies_custom_option.proto
@@ -0,0 +1,67 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: trafacz@google.com (Todd Rafacz)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// A proto file we will use for unit testing.
+
+syntax = "proto2";
+
+import "google/protobuf/unittest_lazy_dependencies_enum.proto";
+import "google/protobuf/descriptor.proto";
+
+// Some generic_services option(s) added automatically.
+// See:  http://go/proto2-generic-services-default
+option cc_generic_services = true;   // auto-added
+option java_generic_services = true; // auto-added
+option py_generic_services = true;   // auto-added
+option cc_enable_arenas = true;
+
+// We don't put this in a package within proto2 because we need to make sure
+// that the generated code doesn't depend on being in the proto2 namespace.
+// In test_util.h we do "using namespace unittest = protobuf_unittest".
+package protobuf_unittest.lazy_imports;
+
+// Protos optimized for SPEED use a strict superset of the generated code
+// of equivalent ones optimized for CODE_SIZE, so we should optimize all our
+// tests for speed unless explicitly testing code size optimization.
+option optimize_for = SPEED;
+
+option java_outer_classname = "UnittestLazyImportsCustomOptionProto";
+
+message LazyMessage {
+  optional int32 a = 1;
+}
+
+extend google.protobuf.MessageOptions {
+  optional LazyEnum lazy_enum_option = 138596335 [default = LAZY_ENUM_1];
+}
diff --git a/src/google/protobuf/unittest_lazy_dependencies_enum.proto b/src/google/protobuf/unittest_lazy_dependencies_enum.proto
new file mode 100644
index 00000000..9be64d85
--- /dev/null
+++ b/src/google/protobuf/unittest_lazy_dependencies_enum.proto
@@ -0,0 +1,61 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: trafacz@google.com (Todd Rafacz)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// A proto file we will use for unit testing.
+
+syntax = "proto2";
+
+// Some generic_services option(s) added automatically.
+// See:  http://go/proto2-generic-services-default
+option cc_generic_services = true;   // auto-added
+option java_generic_services = true; // auto-added
+option py_generic_services = true;   // auto-added
+option cc_enable_arenas = true;
+
+// We don't put this in a package within proto2 because we need to make sure
+// that the generated code doesn't depend on being in the proto2 namespace.
+// In test_util.h we do "using namespace unittest = protobuf_unittest".
+package protobuf_unittest.lazy_imports;
+
+// Protos optimized for SPEED use a strict superset of the generated code
+// of equivalent ones optimized for CODE_SIZE, so we should optimize all our
+// tests for speed unless explicitly testing code size optimization.
+option optimize_for = SPEED;
+
+option java_outer_classname = "UnittestLazyImportsEnumProto";
+
+enum LazyEnum {
+  LAZY_ENUM_0 = 0;
+  LAZY_ENUM_1 = 1;
+}
diff --git a/src/google/protobuf/unittest_lite.proto b/src/google/protobuf/unittest_lite.proto
index c39ac6b0..f3ff2b5d 100644
--- a/src/google/protobuf/unittest_lite.proto
+++ b/src/google/protobuf/unittest_lite.proto
@@ -439,3 +439,37 @@ message TestHugeFieldNumbersLite {
 extend TestHugeFieldNumbersLite {
   optional TestAllTypesLite test_all_types_lite = 536860000;
 }
+
+message TestOneofParsingLite {
+  oneof oneof_field {
+    int32 oneof_int32 = 1;
+    TestAllTypesLite oneof_submessage = 2;
+    string oneof_string = 3;
+    bytes oneof_bytes = 4 [default = "default bytes"];
+    string oneof_string_cord = 5 [ctype = CORD, default = "default Cord"];
+    bytes oneof_bytes_cord = 6 [ctype = CORD];
+    string oneof_string_string_piece = 7 [ctype = STRING_PIECE];
+    bytes oneof_bytes_string_piece = 8
+        [ctype = STRING_PIECE, default = "default StringPiece"];
+    V2EnumLite oneof_enum = 9;
+  }
+}
+
+// The following four messages are set up to test for wire compatibility between
+// packed and non-packed repeated fields. We use the field number 2048, because
+// that is large enough to require a 3-byte varint for the tag.
+message PackedInt32 {
+  repeated int32 repeated_int32 = 2048 [packed = true];
+}
+
+message NonPackedInt32 {
+  repeated int32 repeated_int32 = 2048;
+}
+
+message PackedFixed32 {
+  repeated fixed32 repeated_fixed32 = 2048 [packed = true];
+}
+
+message NonPackedFixed32 {
+  repeated fixed32 repeated_fixed32 = 2048;
+}
diff --git a/src/google/protobuf/unittest_lite_imports_nonlite.proto b/src/google/protobuf/unittest_lite_imports_nonlite.proto
index 132d6a82..8a470160 100644
--- a/src/google/protobuf/unittest_lite_imports_nonlite.proto
+++ b/src/google/protobuf/unittest_lite_imports_nonlite.proto
@@ -41,4 +41,7 @@ option optimize_for = LITE_RUNTIME;
 
 message TestLiteImportsNonlite {
   optional TestAllTypes message = 1;
+
+  // Verifies that transitive required fields generates valid code.
+  optional TestRequired message_with_required = 2;
 }
diff --git a/src/google/protobuf/unittest_proto3.proto b/src/google/protobuf/unittest_proto3.proto
index a27b1b26..84815d42 100644
--- a/src/google/protobuf/unittest_proto3.proto
+++ b/src/google/protobuf/unittest_proto3.proto
@@ -28,35 +28,13 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-//
-// A proto file we will use for unit testing.
-
 syntax = "proto3";
 
-// Some generic_services option(s) added automatically.
-// See:  http://go/proto2-generic-services-default
-option cc_generic_services = true;     // auto-added
-option java_generic_services = true;   // auto-added
-option py_generic_services = true;     // auto-added
-option cc_enable_arenas = true;
-option csharp_namespace = "Google.Protobuf.TestProtos";
-
-import "google/protobuf/unittest_import_proto3.proto";
-
-// We don't put this in a package within proto2 because we need to make sure
-// that the generated code doesn't depend on being in the proto2 namespace.
-// In test_util.h we do "using namespace unittest = protobuf_unittest".
-package protobuf_unittest;
-
-// Protos optimized for SPEED use a strict superset of the generated code
-// of equivalent ones optimized for CODE_SIZE, so we should optimize all our
-// tests for speed unless explicitly testing code size optimization.
 option optimize_for = SPEED;
 
-option java_outer_classname = "UnittestProto";
+import "google/protobuf/unittest_import.proto";
+
+package proto3_unittest;
 
 // This proto includes every type of field in both singular and repeated
 // forms.
@@ -69,7 +47,7 @@ message TestAllTypes {
   }
 
   enum NestedEnum {
-    NESTED_ENUM_UNSPECIFIED = 0;
+    ZERO = 0;
     FOO = 1;
     BAR = 2;
     BAZ = 3;
@@ -77,33 +55,49 @@ message TestAllTypes {
   }
 
   // Singular
-  int32 single_int32 = 1;
-  int64 single_int64 = 2;
-  uint32 single_uint32 = 3;
-  uint64 single_uint64 = 4;
-  sint32 single_sint32 = 5;
-  sint64 single_sint64 = 6;
-  fixed32 single_fixed32 = 7;
-  fixed64 single_fixed64 = 8;
-  sfixed32 single_sfixed32 = 9;
-  sfixed64 single_sfixed64 = 10;
-  float single_float = 11;
-  double single_double = 12;
-  bool single_bool = 13;
-  string single_string = 14;
-  bytes single_bytes = 15;
-
-  NestedMessage single_nested_message = 18;
-  ForeignMessage single_foreign_message = 19;
-  protobuf_unittest_import.ImportMessage single_import_message = 20;
-
-  NestedEnum single_nested_enum = 21;
-  ForeignEnum single_foreign_enum = 22;
-  protobuf_unittest_import.ImportEnum single_import_enum = 23;
+     int32 optional_int32    =  1;
+     int64 optional_int64    =  2;
+    uint32 optional_uint32   =  3;
+    uint64 optional_uint64   =  4;
+    sint32 optional_sint32   =  5;
+    sint64 optional_sint64   =  6;
+   fixed32 optional_fixed32  =  7;
+   fixed64 optional_fixed64  =  8;
+  sfixed32 optional_sfixed32 =  9;
+  sfixed64 optional_sfixed64 = 10;
+     float optional_float    = 11;
+    double optional_double   = 12;
+      bool optional_bool     = 13;
+    string optional_string   = 14;
+     bytes optional_bytes    = 15;
+
+  // Groups are not allowed in proto3.
+  // optional group OptionalGroup = 16 {
+  //   optional int32 a = 17;
+  // }
+
+  NestedMessage                        optional_nested_message  = 18;
+  ForeignMessage                       optional_foreign_message = 19;
+  protobuf_unittest_import.ImportMessage optional_import_message  = 20;
+
+  NestedEnum                           optional_nested_enum     = 21;
+  ForeignEnum                          optional_foreign_enum    = 22;
+
+  // Omitted (compared to unittest.proto) because proto2 enums are not allowed
+  // inside proto2 messages.
+  //
+  // optional protobuf_unittest_import.ImportEnum    optional_import_enum  = 23;
+
+  string optional_string_piece = 24 [ctype=STRING_PIECE];
+  string optional_cord = 25 [ctype=CORD];
 
   // Defined in unittest_import_public.proto
   protobuf_unittest_import.PublicImportMessage
-      single_public_import_message = 26;
+      optional_public_import_message = 26;
+
+  NestedMessage optional_lazy_message = 27 [lazy=true];
+  protobuf_unittest_import.ImportMessage optional_lazy_import_message = 115
+      [lazy = true];
 
   // Repeated
   repeated    int32 repeated_int32    = 31;
@@ -122,18 +116,28 @@ message TestAllTypes {
   repeated   string repeated_string   = 44;
   repeated    bytes repeated_bytes    = 45;
 
+  // Groups are not allowed in proto3.
+  // repeated group RepeatedGroup = 46 {
+  //   optional int32 a = 47;
+  // }
+
   repeated NestedMessage                        repeated_nested_message  = 48;
   repeated ForeignMessage                       repeated_foreign_message = 49;
   repeated protobuf_unittest_import.ImportMessage repeated_import_message  = 50;
 
   repeated NestedEnum                           repeated_nested_enum     = 51;
   repeated ForeignEnum                          repeated_foreign_enum    = 52;
-  repeated protobuf_unittest_import.ImportEnum    repeated_import_enum     = 53;
-  // Defined in unittest_import_public.proto
-  repeated protobuf_unittest_import.PublicImportMessage
-      repeated_public_import_message = 54;
 
-  // For oneof test
+  // Omitted (compared to unittest.proto) because proto2 enums are not allowed
+  // inside proto2 messages.
+  //
+  // repeated protobuf_unittest_import.ImportEnum    repeated_import_enum  = 53;
+
+  repeated string repeated_string_piece = 54 [ctype=STRING_PIECE];
+  repeated string repeated_cord = 55 [ctype=CORD];
+
+  repeated NestedMessage repeated_lazy_message = 57 [lazy=true];
+
   oneof oneof_field {
     uint32 oneof_uint32 = 111;
     NestedMessage oneof_nested_message = 112;
@@ -142,176 +146,6 @@ message TestAllTypes {
   }
 }
 
-// This proto includes a recusively nested message.
-message NestedTestAllTypes {
-  NestedTestAllTypes child = 1;
-  TestAllTypes payload = 2;
-  repeated NestedTestAllTypes repeated_child = 3;
-}
-
-message TestDeprecatedFields {
-  int32 deprecated_int32 = 1 [deprecated=true];
-}
-
-// Define these after TestAllTypes to make sure the compiler can handle
-// that.
-message ForeignMessage {
-  int32 c = 1;
-}
-
-enum ForeignEnum {
-  FOREIGN_UNSPECIFIED = 0;
-  FOREIGN_FOO = 4;
-  FOREIGN_BAR = 5;
-  FOREIGN_BAZ = 6;
-}
-
-message TestReservedFields {
-  reserved 2, 15, 9 to 11;
-  reserved "bar", "baz";
-}
-
-
-// Test that we can use NestedMessage from outside TestAllTypes.
-message TestForeignNested {
-  TestAllTypes.NestedMessage foreign_nested = 1;
-}
-
-// Test that really large tag numbers don't break anything.
-message TestReallyLargeTagNumber {
-  // The largest possible tag number is 2^28 - 1, since the wire format uses
-  // three bits to communicate wire type.
-  int32 a = 1;
-  int32 bb = 268435455;
-}
-
-message TestRecursiveMessage {
-  TestRecursiveMessage a = 1;
-  int32 i = 2;
-}
-
-// Test that mutual recursion works.
-message TestMutualRecursionA {
-  TestMutualRecursionB bb = 1;
-}
-
-message TestMutualRecursionB {
-  TestMutualRecursionA a = 1;
-  int32 optional_int32 = 2;
-}
-
-message TestEnumAllowAlias {
-  TestEnumWithDupValue value = 1;
-}
-
-// Test an enum that has multiple values with the same number.
-enum TestEnumWithDupValue {
-  TEST_ENUM_WITH_DUP_VALUE_UNSPECIFIED = 0;
-  option allow_alias = true;
-
-  FOO1 = 1;
-  BAR1 = 2;
-  BAZ = 3;
-  FOO2 = 1;
-  BAR2 = 2;
-}
-
-// Test an enum with large, unordered values.
-enum TestSparseEnum {
-  TEST_SPARSE_ENUM_UNSPECIFIED = 0;
-  SPARSE_A = 123;
-  SPARSE_B = 62374;
-  SPARSE_C = 12589234;
-  SPARSE_D = -15;
-  SPARSE_E = -53452;
-  // In proto3, value 0 must be the first one specified
-  // SPARSE_F = 0;
-  SPARSE_G = 2;
-}
-
-// Test message with CamelCase field names.  This violates Protocol Buffer
-// standard style.
-message TestCamelCaseFieldNames {
-  int32 PrimitiveField = 1;
-  string StringField = 2;
-  ForeignEnum EnumField = 3;
-  ForeignMessage MessageField = 4;
-
-  repeated int32 RepeatedPrimitiveField = 7;
-  repeated string RepeatedStringField = 8;
-  repeated ForeignEnum RepeatedEnumField = 9;
-  repeated ForeignMessage RepeatedMessageField = 10;
-}
-
-
-// We list fields out of order, to ensure that we're using field number and not
-// field index to determine serialization order.
-message TestFieldOrderings {
-  string my_string = 11;
-  int64 my_int = 1;
-  float my_float = 101;
-  message NestedMessage {
-    int64 oo = 2;
-    // The field name "b" fails to compile in proto1 because it conflicts with
-    // a local variable named "b" in one of the generated methods.  Doh.
-    // This file needs to compile in proto1 to test backwards-compatibility.
-    int32 bb = 1;
-  }
-
-  NestedMessage single_nested_message  = 200;
-}
-
-message SparseEnumMessage {
-  TestSparseEnum sparse_enum = 1;
-}
-
-// Test String and Bytes: string is for valid UTF-8 strings
-message OneString {
-  string data = 1;
-}
-
-message MoreString {
-  repeated string data = 1;
-}
-
-message OneBytes {
-  bytes data = 1;
-}
-
-message MoreBytes {
-  bytes data = 1;
-}
-
-// Test int32, uint32, int64, uint64, and bool are all compatible
-message Int32Message {
-  int32 data = 1;
-}
-
-message Uint32Message {
-  uint32 data = 1;
-}
-
-message Int64Message {
-  int64 data = 1;
-}
-
-message Uint64Message {
-  uint64 data = 1;
-}
-
-message BoolMessage {
-  bool data = 1;
-}
-
-// Test oneofs.
-message TestOneof {
-  oneof foo {
-    int32 foo_int = 1;
-    string foo_string = 2;
-    TestAllTypes foo_message = 3;
-  }
-}
-
 // Test messages for packed fields
 
 message TestPackedTypes {
@@ -331,61 +165,44 @@ message TestPackedTypes {
   repeated ForeignEnum packed_enum  = 103 [packed = true];
 }
 
-// A message with the same fields as TestPackedTypes, but without packing. Used
-// to test packed <-> unpacked wire compatibility.
+// Explicitly set packed to false
 message TestUnpackedTypes {
-  repeated    int32 unpacked_int32    =  90 [packed = false];
-  repeated    int64 unpacked_int64    =  91 [packed = false];
-  repeated   uint32 unpacked_uint32   =  92 [packed = false];
-  repeated   uint64 unpacked_uint64   =  93 [packed = false];
-  repeated   sint32 unpacked_sint32   =  94 [packed = false];
-  repeated   sint64 unpacked_sint64   =  95 [packed = false];
-  repeated  fixed32 unpacked_fixed32  =  96 [packed = false];
-  repeated  fixed64 unpacked_fixed64  =  97 [packed = false];
-  repeated sfixed32 unpacked_sfixed32 =  98 [packed = false];
-  repeated sfixed64 unpacked_sfixed64 =  99 [packed = false];
-  repeated    float unpacked_float    = 100 [packed = false];
-  repeated   double unpacked_double   = 101 [packed = false];
-  repeated     bool unpacked_bool     = 102 [packed = false];
-  repeated ForeignEnum unpacked_enum  = 103 [packed = false];
+  repeated    int32 repeated_int32    =  1 [packed = false];
+  repeated    int64 repeated_int64    =  2 [packed = false];
+  repeated   uint32 repeated_uint32   =  3 [packed = false];
+  repeated   uint64 repeated_uint64   =  4 [packed = false];
+  repeated   sint32 repeated_sint32   =  5 [packed = false];
+  repeated   sint64 repeated_sint64   =  6 [packed = false];
+  repeated  fixed32 repeated_fixed32  =  7 [packed = false];
+  repeated  fixed64 repeated_fixed64  =  8 [packed = false];
+  repeated sfixed32 repeated_sfixed32 =  9 [packed = false];
+  repeated sfixed64 repeated_sfixed64 = 10 [packed = false];
+  repeated    float repeated_float    = 11 [packed = false];
+  repeated   double repeated_double   = 12 [packed = false];
+  repeated     bool repeated_bool     = 13 [packed = false];
+  repeated TestAllTypes.NestedEnum repeated_nested_enum = 14 [packed = false];
 }
 
-message TestRepeatedScalarDifferentTagSizes {
-  // Parsing repeated fixed size values used to fail. This message needs to be
-  // used in order to get a tag of the right size; all of the repeated fields
-  // in TestAllTypes didn't trigger the check.
-  repeated fixed32 repeated_fixed32 = 12;
-  // Check for a varint type, just for good measure.
-  repeated int32   repeated_int32   = 13;
-
-  // These have two-byte tags.
-  repeated fixed64 repeated_fixed64 = 2046;
-  repeated int64   repeated_int64   = 2047;
-
-  // Three byte tags.
-  repeated float   repeated_float   = 262142;
-  repeated uint64  repeated_uint64  = 262143;
+// This proto includes a recusively nested message.
+message NestedTestAllTypes {
+  NestedTestAllTypes child = 1;
+  TestAllTypes payload = 2;
 }
 
-message TestCommentInjectionMessage {
-  // */ <- This should not close the generated doc comment
-  string a = 1;
+// Define these after TestAllTypes to make sure the compiler can handle
+// that.
+message ForeignMessage {
+  int32 c = 1;
 }
 
-
-// Test that RPC services work.
-message FooRequest  {}
-message FooResponse {}
-
-message FooClientMessage {}
-message FooServerMessage{}
-
-service TestService {
-  rpc Foo(FooRequest) returns (FooResponse);
-  rpc Bar(BarRequest) returns (BarResponse);
+enum ForeignEnum {
+  FOREIGN_ZERO = 0;
+  FOREIGN_FOO = 4;
+  FOREIGN_BAR = 5;
+  FOREIGN_BAZ = 6;
 }
 
-
-message BarRequest  {}
-message BarResponse {}
+// TestEmptyMessage is used to test behavior of unknown fields.
+message TestEmptyMessage {
+}
 
diff --git a/src/google/protobuf/unittest_proto3_arena.proto b/src/google/protobuf/unittest_proto3_arena.proto
index b835a6ba..ea88ec90 100644
--- a/src/google/protobuf/unittest_proto3_arena.proto
+++ b/src/google/protobuf/unittest_proto3_arena.proto
@@ -96,6 +96,8 @@ message TestAllTypes {
       optional_public_import_message = 26;
 
   NestedMessage optional_lazy_message = 27 [lazy=true];
+  protobuf_unittest_import.ImportMessage optional_lazy_import_message = 115
+      [lazy = true];
 
   // Repeated
   repeated    int32 repeated_int32    = 31;
@@ -185,6 +187,7 @@ message TestUnpackedTypes {
 message NestedTestAllTypes {
   NestedTestAllTypes child = 1;
   TestAllTypes payload = 2;
+  repeated NestedTestAllTypes repeated_child = 3;
 }
 
 // Define these after TestAllTypes to make sure the compiler can handle
@@ -203,4 +206,3 @@ enum ForeignEnum {
 // TestEmptyMessage is used to test behavior of unknown fields.
 message TestEmptyMessage {
 }
-
diff --git a/src/google/protobuf/unknown_field_set.cc b/src/google/protobuf/unknown_field_set.cc
index 9472c4fa..0ada85e5 100644
--- a/src/google/protobuf/unknown_field_set.cc
+++ b/src/google/protobuf/unknown_field_set.cc
@@ -123,21 +123,21 @@ void UnknownFieldSet::MergeToInternalMetdata(
   metadata->mutable_unknown_fields()->MergeFrom(other);
 }
 
-int UnknownFieldSet::SpaceUsedExcludingSelf() const {
+size_t UnknownFieldSet::SpaceUsedExcludingSelfLong() const {
   if (fields_ == NULL) return 0;
 
-  int total_size = sizeof(*fields_) + sizeof(UnknownField) * fields_->size();
+  size_t total_size = sizeof(*fields_) + sizeof(UnknownField) * fields_->size();
 
   for (int i = 0; i < fields_->size(); i++) {
     const UnknownField& field = (*fields_)[i];
     switch (field.type()) {
       case UnknownField::TYPE_LENGTH_DELIMITED:
-        total_size += sizeof(*field.length_delimited_.string_value_) +
-                      internal::StringSpaceUsedExcludingSelf(
-                          *field.length_delimited_.string_value_);
+        total_size += sizeof(*field.data_.length_delimited_.string_value_) +
+                      internal::StringSpaceUsedExcludingSelfLong(
+                          *field.data_.length_delimited_.string_value_);
         break;
       case UnknownField::TYPE_GROUP:
-        total_size += field.group_->SpaceUsed();
+        total_size += field.data_.group_->SpaceUsedLong();
         break;
       default:
         break;
@@ -146,7 +146,7 @@ int UnknownFieldSet::SpaceUsedExcludingSelf() const {
   return total_size;
 }
 
-int UnknownFieldSet::SpaceUsed() const {
+size_t UnknownFieldSet::SpaceUsedLong() const {
   return sizeof(*this) + SpaceUsedExcludingSelf();
 }
 
@@ -154,7 +154,7 @@ void UnknownFieldSet::AddVarint(int number, uint64 value) {
   UnknownField field;
   field.number_ = number;
   field.SetType(UnknownField::TYPE_VARINT);
-  field.varint_ = value;
+  field.data_.varint_ = value;
   if (fields_ == NULL) fields_ = new std::vector<UnknownField>();
   fields_->push_back(field);
 }
@@ -163,7 +163,7 @@ void UnknownFieldSet::AddFixed32(int number, uint32 value) {
   UnknownField field;
   field.number_ = number;
   field.SetType(UnknownField::TYPE_FIXED32);
-  field.fixed32_ = value;
+  field.data_.fixed32_ = value;
   if (fields_ == NULL) fields_ = new std::vector<UnknownField>();
   fields_->push_back(field);
 }
@@ -172,7 +172,7 @@ void UnknownFieldSet::AddFixed64(int number, uint64 value) {
   UnknownField field;
   field.number_ = number;
   field.SetType(UnknownField::TYPE_FIXED64);
-  field.fixed64_ = value;
+  field.data_.fixed64_ = value;
   if (fields_ == NULL) fields_ = new std::vector<UnknownField>();
   fields_->push_back(field);
 }
@@ -181,10 +181,10 @@ string* UnknownFieldSet::AddLengthDelimited(int number) {
   UnknownField field;
   field.number_ = number;
   field.SetType(UnknownField::TYPE_LENGTH_DELIMITED);
-  field.length_delimited_.string_value_ = new string;
+  field.data_.length_delimited_.string_value_ = new string;
   if (fields_ == NULL) fields_ = new std::vector<UnknownField>();
   fields_->push_back(field);
-  return field.length_delimited_.string_value_;
+  return field.data_.length_delimited_.string_value_;
 }
 
 
@@ -192,10 +192,10 @@ UnknownFieldSet* UnknownFieldSet::AddGroup(int number) {
   UnknownField field;
   field.number_ = number;
   field.SetType(UnknownField::TYPE_GROUP);
-  field.group_ = new UnknownFieldSet;
+  field.data_.group_ = new UnknownFieldSet;
   if (fields_ == NULL) fields_ = new std::vector<UnknownField>();
   fields_->push_back(field);
-  return field.group_;
+  return field.data_.group_;
 }
 
 void UnknownFieldSet::AddField(const UnknownField& field) {
@@ -276,10 +276,10 @@ bool UnknownFieldSet::ParseFromArray(const void* data, int size) {
 void UnknownField::Delete() {
   switch (type()) {
     case UnknownField::TYPE_LENGTH_DELIMITED:
-      delete length_delimited_.string_value_;
+      delete data_.length_delimited_.string_value_;
       break;
     case UnknownField::TYPE_GROUP:
-      delete group_;
+      delete data_.group_;
       break;
     default:
       break;
@@ -291,10 +291,10 @@ void UnknownField::Delete() {
 void UnknownField::Reset() {
   switch (type()) {
     case UnknownField::TYPE_LENGTH_DELIMITED:
-      length_delimited_.string_value_ = NULL;
+      data_.length_delimited_.string_value_ = NULL;
       break;
     case UnknownField::TYPE_GROUP: {
-      group_ = NULL;
+      data_.group_ = NULL;
       break;
     }
     default:
@@ -305,13 +305,13 @@ void UnknownField::Reset() {
 void UnknownField::DeepCopy(const UnknownField& other) {
   switch (type()) {
     case UnknownField::TYPE_LENGTH_DELIMITED:
-      length_delimited_.string_value_ = new string(
-          *length_delimited_.string_value_);
+      data_.length_delimited_.string_value_ = new string(
+          *data_.length_delimited_.string_value_);
       break;
     case UnknownField::TYPE_GROUP: {
       UnknownFieldSet* group = new UnknownFieldSet();
-      group->InternalMergeFrom(*group_);
-      group_ = group;
+      group->InternalMergeFrom(*data_.group_);
+      data_.group_ = group;
       break;
     }
     default:
@@ -323,14 +323,14 @@ void UnknownField::DeepCopy(const UnknownField& other) {
 void UnknownField::SerializeLengthDelimitedNoTag(
     io::CodedOutputStream* output) const {
   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
-  const string& data = *length_delimited_.string_value_;
+  const string& data = *data_.length_delimited_.string_value_;
   output->WriteVarint32(data.size());
   output->WriteRawMaybeAliased(data.data(), data.size());
 }
 
 uint8* UnknownField::SerializeLengthDelimitedNoTagToArray(uint8* target) const {
   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
-  const string& data = *length_delimited_.string_value_;
+  const string& data = *data_.length_delimited_.string_value_;
   target = io::CodedOutputStream::WriteVarint32ToArray(data.size(), target);
   target = io::CodedOutputStream::WriteStringToArray(data, target);
   return target;
diff --git a/src/google/protobuf/unknown_field_set.h b/src/google/protobuf/unknown_field_set.h
index c2ad8918..619855ed 100644
--- a/src/google/protobuf/unknown_field_set.h
+++ b/src/google/protobuf/unknown_field_set.h
@@ -43,6 +43,7 @@
 #include <vector>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
+#include <google/protobuf/message_lite.h>
 
 namespace google {
 namespace protobuf {
@@ -106,10 +107,18 @@ class LIBPROTOBUF_EXPORT UnknownFieldSet {
   // Computes (an estimate of) the total number of bytes currently used for
   // storing the unknown fields in memory. Does NOT include
   // sizeof(*this) in the calculation.
-  int SpaceUsedExcludingSelf() const;
+  size_t SpaceUsedExcludingSelfLong() const;
+
+  int SpaceUsedExcludingSelf() const {
+    return internal::ToIntSize(SpaceUsedExcludingSelfLong());
+  }
 
   // Version of SpaceUsed() including sizeof(*this).
-  int SpaceUsed() const;
+  size_t SpaceUsedLong() const;
+
+  int SpaceUsed() const {
+    return internal::ToIntSize(SpaceUsedLong());
+  }
 
   // Returns the number of fields present in the UnknownFieldSet.
   inline int field_count() const;
@@ -214,8 +223,6 @@ class LIBPROTOBUF_EXPORT UnknownField {
 
   inline size_t GetLengthDelimitedSize() const;
 
- private:
-  friend class UnknownFieldSet;
 
   // If this UnknownField contains a pointer, delete it.
   void Delete();
@@ -243,7 +250,7 @@ class LIBPROTOBUF_EXPORT UnknownField {
     uint64 fixed64_;
     mutable union LengthDelimited length_delimited_;
     UnknownFieldSet* group_;
-  };
+  } data_;
 };
 
 // ===================================================================
@@ -275,10 +282,10 @@ inline int UnknownFieldSet::field_count() const {
 }
 inline const UnknownField& UnknownFieldSet::field(int index) const {
   GOOGLE_DCHECK(fields_ != NULL);
-  return (*fields_)[index];
+  return (*fields_)[static_cast<size_t>(index)];
 }
 inline UnknownField* UnknownFieldSet::mutable_field(int index) {
-  return &(*fields_)[index];
+  return &(*fields_)[static_cast<size_t>(index)];
 }
 
 inline void UnknownFieldSet::AddLengthDelimited(
@@ -287,60 +294,62 @@ inline void UnknownFieldSet::AddLengthDelimited(
 }
 
 
-inline int UnknownField::number() const { return number_; }
+
+
+inline int UnknownField::number() const { return static_cast<int>(number_); }
 inline UnknownField::Type UnknownField::type() const {
   return static_cast<Type>(type_);
 }
 
 inline uint64 UnknownField::varint() const {
   assert(type() == TYPE_VARINT);
-  return varint_;
+  return data_.varint_;
 }
 inline uint32 UnknownField::fixed32() const {
   assert(type() == TYPE_FIXED32);
-  return fixed32_;
+  return data_.fixed32_;
 }
 inline uint64 UnknownField::fixed64() const {
   assert(type() == TYPE_FIXED64);
-  return fixed64_;
+  return data_.fixed64_;
 }
 inline const string& UnknownField::length_delimited() const {
   assert(type() == TYPE_LENGTH_DELIMITED);
-  return *length_delimited_.string_value_;
+  return *data_.length_delimited_.string_value_;
 }
 inline const UnknownFieldSet& UnknownField::group() const {
   assert(type() == TYPE_GROUP);
-  return *group_;
+  return *data_.group_;
 }
 
 inline void UnknownField::set_varint(uint64 value) {
   assert(type() == TYPE_VARINT);
-  varint_ = value;
+  data_.varint_ = value;
 }
 inline void UnknownField::set_fixed32(uint32 value) {
   assert(type() == TYPE_FIXED32);
-  fixed32_ = value;
+  data_.fixed32_ = value;
 }
 inline void UnknownField::set_fixed64(uint64 value) {
   assert(type() == TYPE_FIXED64);
-  fixed64_ = value;
+  data_.fixed64_ = value;
 }
 inline void UnknownField::set_length_delimited(const string& value) {
   assert(type() == TYPE_LENGTH_DELIMITED);
-  length_delimited_.string_value_->assign(value);
+  data_.length_delimited_.string_value_->assign(value);
 }
 inline string* UnknownField::mutable_length_delimited() {
   assert(type() == TYPE_LENGTH_DELIMITED);
-  return length_delimited_.string_value_;
+  return data_.length_delimited_.string_value_;
 }
 inline UnknownFieldSet* UnknownField::mutable_group() {
   assert(type() == TYPE_GROUP);
-  return group_;
+  return data_.group_;
 }
 
 inline size_t UnknownField::GetLengthDelimitedSize() const {
   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
-  return length_delimited_.string_value_->size();
+  return data_.length_delimited_.string_value_->size();
 }
 
 inline void UnknownField::SetType(Type type) {
diff --git a/src/google/protobuf/unknown_field_set_unittest.cc b/src/google/protobuf/unknown_field_set_unittest.cc
index e55bb012..a64769e7 100644
--- a/src/google/protobuf/unknown_field_set_unittest.cc
+++ b/src/google/protobuf/unknown_field_set_unittest.cc
@@ -49,6 +49,7 @@
 #include <google/protobuf/stubs/mutex.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
+
 #include <google/protobuf/stubs/stl_util.h>
 
 namespace google {
diff --git a/src/google/protobuf/util/delimited_message_util.cc b/src/google/protobuf/util/delimited_message_util.cc
new file mode 100644
index 00000000..3ba930e7
--- /dev/null
+++ b/src/google/protobuf/util/delimited_message_util.cc
@@ -0,0 +1,79 @@
+// Adapted from the patch of kenton@google.com (Kenton Varda)
+// See https://github.com/google/protobuf/pull/710 for details.
+
+#include <google/protobuf/util/delimited_message_util.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+
+bool SerializeDelimitedToFileDescriptor(const MessageLite& message, int file_descriptor) {
+  io::FileOutputStream output(file_descriptor);
+  return SerializeDelimitedToZeroCopyStream(message, &output);
+}
+
+bool SerializeDelimitedToOstream(const MessageLite& message, std::ostream* output) {
+  {
+    io::OstreamOutputStream zero_copy_output(output);
+    if (!SerializeDelimitedToZeroCopyStream(message, &zero_copy_output)) return false;
+  }
+  return output->good();
+}
+
+bool ParseDelimitedFromZeroCopyStream(MessageLite* message, io::ZeroCopyInputStream* input, bool* clean_eof) {
+  google::protobuf::io::CodedInputStream coded_input(input);
+  return ParseDelimitedFromCodedStream(message, &coded_input, clean_eof);
+}
+
+bool ParseDelimitedFromCodedStream(MessageLite* message, io::CodedInputStream* input, bool* clean_eof) {
+  if (clean_eof != NULL) *clean_eof = false;
+  int start = input->CurrentPosition();
+
+  // Read the size.
+  uint32 size;
+  if (!input->ReadVarint32(&size)) {
+    if (clean_eof != NULL) *clean_eof = input->CurrentPosition() == start;
+    return false;
+  }
+
+  // Tell the stream not to read beyond that size.
+  google::protobuf::io::CodedInputStream::Limit limit = input->PushLimit(size);
+
+  // Parse the message.
+  if (!message->MergeFromCodedStream(input)) return false;
+  if (!input->ConsumedEntireMessage()) return false;
+
+  // Release the limit.
+  input->PopLimit(limit);
+
+  return true;
+}
+
+bool SerializeDelimitedToZeroCopyStream(const MessageLite& message, io::ZeroCopyOutputStream* output) {
+  google::protobuf::io::CodedOutputStream coded_output(output);
+  return SerializeDelimitedToCodedStream(message, &coded_output);
+}
+
+bool SerializeDelimitedToCodedStream(const MessageLite& message, io::CodedOutputStream* output) {
+  // Write the size.
+  int size = message.ByteSize();
+  output->WriteVarint32(size);
+
+  // Write the content.
+  uint8* buffer = output->GetDirectBufferForNBytesAndAdvance(size);
+  if (buffer != NULL) {
+    // Optimization: The message fits in one buffer, so use the faster
+    // direct-to-array serialization path.
+    message.SerializeWithCachedSizesToArray(buffer);
+  } else {
+    // Slightly-slower path when the message is multiple buffers.
+    message.SerializeWithCachedSizes(output);
+    if (output->HadError()) return false;
+  }
+
+  return true;
+}
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/util/delimited_message_util.h b/src/google/protobuf/util/delimited_message_util.h
new file mode 100644
index 00000000..e8a7204a
--- /dev/null
+++ b/src/google/protobuf/util/delimited_message_util.h
@@ -0,0 +1,66 @@
+// Adapted from the patch of kenton@google.com (Kenton Varda)
+// See https://github.com/google/protobuf/pull/710 for details.
+
+#ifndef GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__
+#define GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__
+
+#include <ostream>
+
+#include <google/protobuf/message_lite.h>
+#include <google/protobuf/io/coded_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+
+// Write a single size-delimited message from the given stream. Delimited
+// format allows a single file or stream to contain multiple messages,
+// whereas normally writing multiple non-delimited messages to the same
+// stream would cause them to be merged. A delimited message is a varint
+// encoding the message size followed by a message of exactly that size.
+//
+// Note that if you want to *read* a delimited message from a file descriptor
+// or istream, you will need to construct an io::FileInputStream or
+// io::OstreamInputStream (implementations of io::ZeroCopyStream) and use the
+// utility function ParseDelimitedFromZeroCopyStream(). You must then
+// continue to use the same ZeroCopyInputStream to read all further data from
+// the stream until EOF. This is because these ZeroCopyInputStream
+// implementations are buffered: they read a big chunk of data at a time,
+// then parse it. As a result, they may read past the end of the delimited
+// message. There is no way for them to push the extra data back into the
+// underlying source, so instead you must keep using the same stream object.
+bool LIBPROTOBUF_EXPORT SerializeDelimitedToFileDescriptor(const MessageLite& message, int file_descriptor);
+
+bool LIBPROTOBUF_EXPORT SerializeDelimitedToOstream(const MessageLite& message, std::ostream* output);
+
+// Read a single size-delimited message from the given stream. Delimited
+// format allows a single file or stream to contain multiple messages,
+// whereas normally parsing consumes the entire input. A delimited message
+// is a varint encoding the message size followed by a message of exactly
+// that size.
+//
+// If |clean_eof| is not NULL, then it will be set to indicate whether the
+// stream ended cleanly. That is, if the stream ends without this method
+// having read any data at all from it, then *clean_eof will be set true,
+// otherwise it will be set false. Note that these methods return false
+// on EOF, but they also return false on other errors, so |clean_eof| is
+// needed to distinguish a clean end from errors.
+bool LIBPROTOBUF_EXPORT ParseDelimitedFromZeroCopyStream(MessageLite* message, io::ZeroCopyInputStream* input, bool* clean_eof);
+
+bool LIBPROTOBUF_EXPORT ParseDelimitedFromCodedStream(MessageLite* message, io::CodedInputStream* input, bool* clean_eof);
+
+// Write a single size-delimited message from the given stream. Delimited
+// format allows a single file or stream to contain multiple messages,
+// whereas normally writing multiple non-delimited messages to the same
+// stream would cause them to be merged. A delimited message is a varint
+// encoding the message size followed by a message of exactly that size.
+bool LIBPROTOBUF_EXPORT SerializeDelimitedToZeroCopyStream(const MessageLite& message, io::ZeroCopyOutputStream* output);
+
+bool LIBPROTOBUF_EXPORT SerializeDelimitedToCodedStream(const MessageLite& message, io::CodedOutputStream* output);
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
+
+#endif  // GOOGLE_PROTOBUF_UTIL_DELIMITED_MESSAGE_UTIL_H__
diff --git a/src/google/protobuf/util/delimited_message_util_test.cc b/src/google/protobuf/util/delimited_message_util_test.cc
new file mode 100644
index 00000000..157a8411
--- /dev/null
+++ b/src/google/protobuf/util/delimited_message_util_test.cc
@@ -0,0 +1,57 @@
+// Adapted from the patch of kenton@google.com (Kenton Varda)
+// See https://github.com/google/protobuf/pull/710 for details.
+
+#include <google/protobuf/util/delimited_message_util.h>
+
+#include <sstream>
+
+#include <google/protobuf/test_util.h>
+#include <google/protobuf/unittest.pb.h>
+#include <google/protobuf/testing/googletest.h>
+#include <gtest/gtest.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+
+TEST(DelimitedMessageUtilTest, DelimitedMessages) {
+  std::stringstream stream;
+
+  {
+    protobuf_unittest::TestAllTypes message1;
+    TestUtil::SetAllFields(&message1);
+    EXPECT_TRUE(SerializeDelimitedToOstream(message1, &stream));
+
+    protobuf_unittest::TestPackedTypes message2;
+    TestUtil::SetPackedFields(&message2);
+    EXPECT_TRUE(SerializeDelimitedToOstream(message2, &stream));
+  }
+
+  {
+    bool clean_eof;
+    io::IstreamInputStream zstream(&stream);
+
+    protobuf_unittest::TestAllTypes message1;
+    clean_eof = true;
+    EXPECT_TRUE(ParseDelimitedFromZeroCopyStream(&message1,
+        &zstream, &clean_eof));
+    EXPECT_FALSE(clean_eof);
+    TestUtil::ExpectAllFieldsSet(message1);
+
+    protobuf_unittest::TestPackedTypes message2;
+    clean_eof = true;
+    EXPECT_TRUE(ParseDelimitedFromZeroCopyStream(&message2,
+        &zstream, &clean_eof));
+    EXPECT_FALSE(clean_eof);
+    TestUtil::ExpectPackedFieldsSet(message2);
+
+    clean_eof = false;
+    EXPECT_FALSE(ParseDelimitedFromZeroCopyStream(&message2,
+        &zstream, &clean_eof));
+    EXPECT_TRUE(clean_eof);
+  }
+}
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
diff --git a/src/google/protobuf/util/field_comparator.cc b/src/google/protobuf/util/field_comparator.cc
index a1a56ee6..86ddf06a 100644
--- a/src/google/protobuf/util/field_comparator.cc
+++ b/src/google/protobuf/util/field_comparator.cc
@@ -36,6 +36,7 @@
 
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
+#include <google/protobuf/util/message_differencer.h>
 #include <google/protobuf/stubs/map_util.h>
 #include <google/protobuf/stubs/mathlimits.h>
 #include <google/protobuf/stubs/mathutil.h>
@@ -130,6 +131,15 @@ FieldComparator::ComparisonResult DefaultFieldComparator::Compare(
   }
 }
 
+bool DefaultFieldComparator::Compare(
+    MessageDifferencer* differencer,
+    const Message& message1,
+    const Message& message2,
+    const google::protobuf::util::FieldContext* field_context) {
+  return differencer->Compare(
+      message1, message2, field_context->parent_fields());
+}
+
 void DefaultFieldComparator::SetDefaultFractionAndMargin(double fraction,
                                                          double margin) {
   default_tolerance_ = Tolerance(fraction, margin);
diff --git a/src/google/protobuf/util/field_comparator.h b/src/google/protobuf/util/field_comparator.h
index ad560ebc..27ef4c77 100644
--- a/src/google/protobuf/util/field_comparator.h
+++ b/src/google/protobuf/util/field_comparator.h
@@ -35,6 +35,7 @@
 
 #include <map>
 #include <string>
+#include <vector>
 
 #include <google/protobuf/stubs/common.h>
 
@@ -48,6 +49,7 @@ class FieldDescriptor;
 namespace util {
 
 class FieldContext;
+class MessageDifferencer;
 
 // Base class specifying the interface for comparing protocol buffer fields.
 // Regular users should consider using or subclassing DefaultFieldComparator
@@ -153,6 +155,15 @@ class LIBPROTOBUF_EXPORT DefaultFieldComparator : public FieldComparator {
   // REQUIRES: float_comparison_ == APPROXIMATE
   void SetDefaultFractionAndMargin(double fraction, double margin);
 
+ protected:
+  // Compare using the provided message_differencer. For example, a subclass can
+  // use this method to compare some field in a certain way using the same
+  // message_differencer instance and the field context.
+  bool Compare(MessageDifferencer* differencer,
+               const google::protobuf::Message& message1,
+               const google::protobuf::Message& message2,
+               const google::protobuf::util::FieldContext* field_context);
+
  private:
   // Defines the tolerance for floating point comparison (fraction and margin).
   struct Tolerance {
@@ -237,7 +248,7 @@ class LIBPROTOBUF_EXPORT DefaultFieldComparator : public FieldComparator {
 
   // True iff default_tolerance_ has been explicitly set.
   //
-  // If false, then the default tolerance for flaots and doubles is that which
+  // If false, then the default tolerance for floats and doubles is that which
   // is used by MathUtil::AlmostEquals().
   bool has_default_tolerance_;
 
diff --git a/src/google/protobuf/util/field_mask_util.cc b/src/google/protobuf/util/field_mask_util.cc
index 85cecec5..a2e2a388 100644
--- a/src/google/protobuf/util/field_mask_util.cc
+++ b/src/google/protobuf/util/field_mask_util.cc
@@ -31,6 +31,7 @@
 #include <google/protobuf/util/field_mask_util.h>
 
 #include <google/protobuf/stubs/strutil.h>
+
 #include <google/protobuf/stubs/map_util.h>
 
 namespace google {
@@ -131,27 +132,27 @@ bool FieldMaskUtil::FromJsonString(StringPiece str, FieldMask* out) {
 bool FieldMaskUtil::GetFieldDescriptors(
     const Descriptor* descriptor, StringPiece path,
     std::vector<const FieldDescriptor*>* field_descriptors) {
-  if (field_descriptors != NULL) {
+  if (field_descriptors != nullptr) {
     field_descriptors->clear();
   }
   std::vector<string> parts = Split(path, ".");
   for (int i = 0; i < parts.size(); ++i) {
     const string& field_name = parts[i];
-    if (descriptor == NULL) {
+    if (descriptor == nullptr) {
       return false;
     }
     const FieldDescriptor* field = descriptor->FindFieldByName(field_name);
-    if (field == NULL) {
+    if (field == nullptr) {
       return false;
     }
-    if (field_descriptors != NULL) {
+    if (field_descriptors != nullptr) {
       field_descriptors->push_back(field);
     }
     if (!field->is_repeated() &&
         field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
       descriptor = field->message_type();
     } else {
-      descriptor = NULL;
+      descriptor = nullptr;
     }
   }
   return true;
@@ -192,6 +193,13 @@ class FieldMaskTree {
   // children removed because the path matches all the node's children.
   void AddPath(const string& path);
 
+  // Remove a path from the tree.
+  // If the path is a sub-path of an existing field path in the tree, it means
+  // we need remove the existing fied path and add all sub-paths except
+  // specified path. If the path matches an existing node in the tree, this node
+  // will be moved.
+  void RemovePath(const string& path, const Descriptor* descriptor);
+
   // Calculate the intersection part of a field path with this tree and add
   // the intersection field path into out.
   void IntersectPath(const string& path, FieldMaskTree* out);
@@ -207,6 +215,18 @@ class FieldMaskTree {
     MergeMessage(&root_, source, options, destination);
   }
 
+  // Add required field path of the message to this tree based on current tree
+  // structure. If a message is present in the tree, add the path of its
+  // required field to the tree. This is to make sure that after trimming a
+  // message with required fields are set, check IsInitialized() will not fail.
+  void AddRequiredFieldPath(const Descriptor* descriptor) {
+    // Do nothing if the tree is empty.
+    if (root_.children.empty()) {
+      return;
+    }
+    AddRequiredFieldPath(&root_, descriptor);
+  }
+
   // Trims all fields not specified by this tree from the given message.
   void TrimMessage(Message* message) {
     // Do nothing if the tree is empty.
@@ -249,6 +269,12 @@ class FieldMaskTree {
                     const FieldMaskUtil::MergeOptions& options,
                     Message* destination);
 
+  // Add required field path of the message to this tree based on current tree
+  // structure. If a message is present in the tree, add the path of its
+  // required field to the tree. This is to make sure that after trimming a
+  // message with required fields are set, check IsInitialized() will not fail.
+  void AddRequiredFieldPath(Node* node, const Descriptor* descriptor);
+
   // Trims all fields not specified by this sub-tree from the given message.
   void TrimMessage(const Node* node, Message* message);
 
@@ -315,6 +341,65 @@ void FieldMaskTree::AddPath(const string& path) {
   }
 }
 
+void FieldMaskTree::RemovePath(const string& path,
+                               const Descriptor* descriptor) {
+  if (root_.children.empty()) {
+    // Nothing to be removed from an empty tree. We shortcut it here so an empty
+    // tree won't be interpreted as a field mask containing all fields by the
+    // code below.
+    return;
+  }
+  std::vector<string> parts = Split(path, ".");
+  if (parts.empty()) {
+    return;
+  }
+  std::vector<Node*> nodes(parts.size());
+  Node* node = &root_;
+  const Descriptor* current_descriptor = descriptor;
+  Node* new_branch_node = nullptr;
+  for (int i = 0; i < parts.size(); ++i) {
+    nodes[i] = node;
+    const FieldDescriptor* field_descriptor =
+        current_descriptor->FindFieldByName(parts[i]);
+    if (field_descriptor == nullptr ||
+        (field_descriptor->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE &&
+         i != parts.size() - 1)) {
+      // Invalid path.
+      if (new_branch_node != nullptr) {
+        // If add any new nodes, cleanup.
+        new_branch_node->ClearChildren();
+      }
+      return;
+    }
+
+    if (node->children.empty()) {
+      if (new_branch_node == nullptr) {
+        new_branch_node = node;
+      }
+      for (int i = 0; i < current_descriptor->field_count(); ++i) {
+        node->children[current_descriptor->field(i)->name()] = new Node();
+      }
+    }
+    if (ContainsKey(node->children, parts[i])) {
+      node = node->children[parts[i]];
+      if (field_descriptor->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+        current_descriptor = field_descriptor->message_type();
+      }
+    } else {
+      // Path does not exist.
+      return;
+    }
+  }
+  // Remove path.
+  for (int i = parts.size() - 1; i >= 0; i--) {
+    delete nodes[i]->children[parts[i]];
+    nodes[i]->children.erase(parts[i]);
+    if (!nodes[i]->children.empty()) {
+      break;
+    }
+  }
+}
+
 void FieldMaskTree::IntersectPath(const string& path, FieldMaskTree* out) {
   std::vector<string> parts = Split(path, ".");
   if (parts.empty()) {
@@ -456,6 +541,41 @@ void FieldMaskTree::MergeMessage(const Node* node, const Message& source,
   }
 }
 
+void FieldMaskTree::AddRequiredFieldPath(
+    Node* node, const Descriptor* descriptor) {
+  const int32 field_count = descriptor->field_count();
+  for (int index = 0; index < field_count; ++index) {
+    const FieldDescriptor* field = descriptor->field(index);
+    if (field->is_required()) {
+      const string& node_name = field->name();
+      Node*& child = node->children[node_name];
+      if (child == nullptr) {
+        // Add required field path to the tree
+        child = new Node();
+      } else if (child->children.empty()){
+        // If the required field is in the tree and does not have any children,
+        // do nothing.
+        continue;
+      }
+      // Add required field in the children to the tree if the field is message.
+      if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+        AddRequiredFieldPath(child, field->message_type());
+      }
+    } else if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
+      std::map<string, Node*>::const_iterator it =
+          node->children.find(field->name());
+      if (it != node->children.end()) {
+        // Add required fields in the children to the
+        // tree if the field is a message and present in the tree.
+        Node* child = it->second;
+        if (!child->children.empty()) {
+          AddRequiredFieldPath(child, field->message_type());
+        }
+      }
+    }
+  }
+}
+
 void FieldMaskTree::TrimMessage(const Node* node, Message* message) {
   GOOGLE_DCHECK(!node->children.empty());
   const Reflection* reflection = message->GetReflection();
@@ -470,7 +590,7 @@ void FieldMaskTree::TrimMessage(const Node* node, Message* message) {
     } else {
       if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
         Node* child = it->second;
-        if (!child->children.empty()) {
+        if (!child->children.empty() && reflection->HasField(*message, field)) {
           TrimMessage(child, reflection->MutableMessage(message, field));
         }
       }
@@ -507,6 +627,22 @@ void FieldMaskUtil::Intersect(const FieldMask& mask1, const FieldMask& mask2,
   intersection.MergeToFieldMask(out);
 }
 
+void FieldMaskUtil::InternalSubtract(const Descriptor* descriptor,
+                                     const FieldMask& mask1,
+                                     const FieldMask& mask2, FieldMask* out) {
+  if (mask1.paths().empty()) {
+    out->Clear();
+    return;
+  }
+  FieldMaskTree tree;
+  tree.MergeFromFieldMask(mask1);
+  for (int i = 0; i < mask2.paths_size(); ++i) {
+    tree.RemovePath(mask2.paths(i), descriptor);
+  }
+  out->Clear();
+  tree.MergeToFieldMask(out);
+}
+
 bool FieldMaskUtil::IsPathInFieldMask(StringPiece path, const FieldMask& mask) {
   for (int i = 0; i < mask.paths_size(); ++i) {
     const string& mask_path = mask.paths(i);
@@ -542,6 +678,20 @@ void FieldMaskUtil::TrimMessage(const FieldMask& mask, Message* destination) {
   tree.TrimMessage(GOOGLE_CHECK_NOTNULL(destination));
 }
 
+void FieldMaskUtil::TrimMessage(const FieldMask& mask, Message* destination,
+                                const TrimOptions& options) {
+  // Build a FieldMaskTree and walk through the tree to merge all specified
+  // fields.
+  FieldMaskTree tree;
+  tree.MergeFromFieldMask(mask);
+  // If keep_required_fields is true, implicitely add required fields of
+  // a message present in the tree to prevent from trimming.
+  if (options.keep_required_fields()) {
+    tree.AddRequiredFieldPath(GOOGLE_CHECK_NOTNULL(destination->GetDescriptor()));
+  }
+  tree.TrimMessage(GOOGLE_CHECK_NOTNULL(destination));
+}
+
 }  // namespace util
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/util/field_mask_util.h b/src/google/protobuf/util/field_mask_util.h
index ab1f2e94..f0299de9 100644
--- a/src/google/protobuf/util/field_mask_util.h
+++ b/src/google/protobuf/util/field_mask_util.h
@@ -70,14 +70,14 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil {
   // Checks whether the given path is valid for type T.
   template <typename T>
   static bool IsValidPath(StringPiece path) {
-    return GetFieldDescriptors(T::descriptor(), path, NULL);
+    return GetFieldDescriptors(T::descriptor(), path, nullptr);
   }
 
   // Checks whether the given FieldMask is valid for type T.
   template <typename T>
   static bool IsValidFieldMask(const FieldMask& mask) {
     for (int i = 0; i < mask.paths_size(); ++i) {
-      if (!GetFieldDescriptors(T::descriptor(), mask.paths(i), NULL))
+      if (!GetFieldDescriptors(T::descriptor(), mask.paths(i), nullptr))
         return false;
     }
     return true;
@@ -94,6 +94,13 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil {
   // Creates a FieldMask with all fields of type T. This FieldMask only
   // contains fields of T but not any sub-message fields.
   template <typename T>
+  static FieldMask GetFieldMaskForAllFields() {
+    FieldMask out;
+    InternalGetFieldMaskForAllFields(T::descriptor(), &out);
+    return out;
+  }
+  template <typename T>
+  PROTOBUF_RUNTIME_DEPRECATED("Use *out = GetFieldMaskForAllFields() instead")
   static void GetFieldMaskForAllFields(FieldMask* out) {
     InternalGetFieldMaskForAllFields(T::descriptor(), out);
   }
@@ -113,8 +120,17 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil {
   static void Intersect(const FieldMask& mask1, const FieldMask& mask2,
                         FieldMask* out);
 
+  // Subtracts mask2 from mask1 base of type T.
+  template <typename T>
+  static void Subtract(const FieldMask& mask1, const FieldMask& mask2,
+                       FieldMask* out) {
+    InternalSubtract(T::descriptor(), mask1, mask2, out);
+  }
+
   // Returns true if path is covered by the given FieldMask. Note that path
   // "foo.bar" covers all paths like "foo.bar.baz", "foo.bar.quz.x", etc.
+  // Also note that parent paths are not covered by explicit child path, i.e.
+  // "foo.bar" does NOT cover "foo", even if "bar" is the only child.
   static bool IsPathInFieldMask(StringPiece path, const FieldMask& mask);
 
   class MergeOptions;
@@ -124,10 +140,17 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil {
   static void MergeMessageTo(const Message& source, const FieldMask& mask,
                              const MergeOptions& options, Message* destination);
 
+  class TrimOptions;
   // Removes from 'message' any field that is not represented in the given
   // FieldMask. If the FieldMask is empty, does nothing.
   static void TrimMessage(const FieldMask& mask, Message* message);
 
+  // Removes from 'message' any field that is not represented in the given
+  // FieldMask with customized TrimOptions.
+  // If the FieldMask is empty, does nothing.
+  static void TrimMessage(const FieldMask& mask, Message* message,
+                          const TrimOptions& options);
+
  private:
   friend class SnakeCaseCamelCaseTest;
   // Converts a field name from snake_case to camelCase:
@@ -160,6 +183,10 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil {
 
   static void InternalGetFieldMaskForAllFields(const Descriptor* descriptor,
                                                FieldMask* out);
+
+  static void InternalSubtract(const Descriptor* descriptor,
+                               const FieldMask& mask1, const FieldMask& mask2,
+                               FieldMask* out);
 };
 
 // Note that for compatibility with the defined behaviour for FieldMask in
@@ -194,6 +221,23 @@ class LIBPROTOBUF_EXPORT FieldMaskUtil::MergeOptions {
   bool replace_repeated_fields_;
 };
 
+class LIBPROTOBUF_EXPORT FieldMaskUtil::TrimOptions {
+ public:
+  TrimOptions()
+      : keep_required_fields_(false) {}
+  // When trimming message fields, the default behavior is to trim required
+  // fields of the present message if they are not specified in the field mask.
+  // If you instead want to keep required fields of the present message even
+  // they are not speicifed in the field mask, set this flag to true.
+  void set_keep_required_fields(bool value) {
+    keep_required_fields_ = value;
+  }
+  bool keep_required_fields() const { return keep_required_fields_; }
+
+ private:
+  bool keep_required_fields_;
+};
+
 }  // namespace util
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/util/field_mask_util_test.cc b/src/google/protobuf/util/field_mask_util_test.cc
index f952786f..3ba30aa3 100644
--- a/src/google/protobuf/util/field_mask_util_test.cc
+++ b/src/google/protobuf/util/field_mask_util_test.cc
@@ -114,6 +114,8 @@ TEST_F(SnakeCaseCamelCaseTest, RoundTripTest) {
 }
 
 using protobuf_unittest::TestAllTypes;
+using protobuf_unittest::TestRequired;
+using protobuf_unittest::TestRequiredMessage;
 using protobuf_unittest::NestedTestAllTypes;
 using google::protobuf::FieldMask;
 
@@ -166,7 +168,7 @@ TEST(FieldMaskUtilTest, GetFieldDescriptors) {
   EXPECT_EQ(1, field_descriptors.size());
   EXPECT_EQ("optional_int32", field_descriptors[0]->name());
   EXPECT_FALSE(FieldMaskUtil::GetFieldDescriptors(
-      TestAllTypes::descriptor(), "optional_nonexist", NULL));
+      TestAllTypes::descriptor(), "optional_nonexist", nullptr));
   EXPECT_TRUE(FieldMaskUtil::GetFieldDescriptors(TestAllTypes::descriptor(),
                                                  "optional_nested_message.bb",
                                                  &field_descriptors));
@@ -174,10 +176,10 @@ TEST(FieldMaskUtilTest, GetFieldDescriptors) {
   EXPECT_EQ("optional_nested_message", field_descriptors[0]->name());
   EXPECT_EQ("bb", field_descriptors[1]->name());
   EXPECT_FALSE(FieldMaskUtil::GetFieldDescriptors(
-      TestAllTypes::descriptor(), "optional_nested_message.nonexist", NULL));
+      TestAllTypes::descriptor(), "optional_nested_message.nonexist", nullptr));
   // FieldMask cannot be used to specify sub-fields of a repeated message.
   EXPECT_FALSE(FieldMaskUtil::GetFieldDescriptors(
-      TestAllTypes::descriptor(), "repeated_nested_message.bb", NULL));
+      TestAllTypes::descriptor(), "repeated_nested_message.bb", nullptr));
 }
 
 TEST(FieldMaskUtilTest, TestIsVaildPath) {
@@ -204,12 +206,12 @@ TEST(FieldMaskUtilTest, TestIsValidFieldMask) {
 
 TEST(FieldMaskUtilTest, TestGetFieldMaskForAllFields) {
   FieldMask mask;
-  FieldMaskUtil::GetFieldMaskForAllFields<TestAllTypes::NestedMessage>(&mask);
+  mask = FieldMaskUtil::GetFieldMaskForAllFields<TestAllTypes::NestedMessage>();
   EXPECT_EQ(1, mask.paths_size());
   EXPECT_TRUE(FieldMaskUtil::IsPathInFieldMask("bb", mask));
 
-  FieldMaskUtil::GetFieldMaskForAllFields<TestAllTypes>(&mask);
-  EXPECT_EQ(76, mask.paths_size());
+  mask = FieldMaskUtil::GetFieldMaskForAllFields<TestAllTypes>();
+  EXPECT_EQ(75, mask.paths_size());
   EXPECT_TRUE(FieldMaskUtil::IsPathInFieldMask("optional_int32", mask));
   EXPECT_TRUE(FieldMaskUtil::IsPathInFieldMask("optional_int64", mask));
   EXPECT_TRUE(FieldMaskUtil::IsPathInFieldMask("optional_uint32", mask));
@@ -346,6 +348,53 @@ TEST(FieldMaskUtilTest, TestIntersect) {
   EXPECT_EQ("foo.bar.baz", FieldMaskUtil::ToString(out));
 }
 
+TEST(FieldMaskUtilTest, TestSubtract) {
+  FieldMask mask1, mask2, out;
+  // Normal case.
+  FieldMaskUtil::FromString(
+      "optional_int32,optional_uint64,optional_nested_message,optional_foreign_"
+      "message,repeated_int32,repeated_foreign_message,repeated_nested_message."
+      "bb",
+      &mask1);
+
+  FieldMaskUtil::FromString(
+      "optional_int32,optional_nested_message.bb,optional_foreign_message.c,"
+      "repeated_int32,repeated_nested_message.bb,repeated_foreign_message.f,"
+      "repeated_foreign_message.d,repeated_nested_message.bb,repeated_uint32",
+      &mask2);
+
+  FieldMaskUtil::Subtract<TestAllTypes>(mask1, mask2, &out);
+  EXPECT_EQ(
+      "optional_foreign_message.d,optional_uint64,repeated_foreign_message.c",
+      FieldMaskUtil::ToString(out));
+
+  // mask1 is empty.
+  FieldMaskUtil::FromString("", &mask1);
+  FieldMaskUtil::Subtract<TestAllTypes>(mask1, mask2, &out);
+  EXPECT_EQ("", FieldMaskUtil::ToString(out));
+
+  // mask1 is "optional_nested_message" and mask2 is
+  // "optional_nested_message.nonexist_field".
+  FieldMaskUtil::FromString("optional_nested_message", &mask1);
+  FieldMaskUtil::FromString("optional_nested_message.nonexist_field", &mask2);
+  FieldMaskUtil::Subtract<TestAllTypes>(mask1, mask2, &out);
+  EXPECT_EQ("optional_nested_message", FieldMaskUtil::ToString(out));
+
+  // mask1 is "optional_nested_message" and mask2 is
+  // "optional_nested_message".
+  FieldMaskUtil::FromString("optional_nested_message", &mask1);
+  FieldMaskUtil::FromString("optional_nested_message", &mask2);
+  FieldMaskUtil::Subtract<TestAllTypes>(mask1, mask2, &out);
+  EXPECT_EQ("", FieldMaskUtil::ToString(out));
+
+  // Regression test for b/72727550
+  FieldMaskUtil::FromString("optional_foreign_message.c", &mask1);
+  FieldMaskUtil::FromString("optional_foreign_message,optional_nested_message",
+                            &mask2);
+  FieldMaskUtil::Subtract<TestAllTypes>(mask1, mask2, &out);
+  EXPECT_EQ("", FieldMaskUtil::ToString(out));
+}
+
 TEST(FieldMaskUtilTest, TestIspathInFieldMask) {
   FieldMask mask;
   FieldMaskUtil::FromString("foo.bar", &mask);
@@ -618,6 +667,84 @@ TEST(FieldMaskUtilTest, TrimMessage) {
   FieldMask empty_mask;
   FieldMaskUtil::TrimMessage(empty_mask, &trimmed_all_types);
   EXPECT_EQ(trimmed_all_types.DebugString(), all_types_msg.DebugString());
+
+  // Test trim required fields with keep_required_fields is set true.
+  FieldMaskUtil::TrimOptions options;
+  TestRequired required_msg_1;
+  required_msg_1.set_a(1234);
+  required_msg_1.set_b(3456);
+  required_msg_1.set_c(5678);
+  TestRequired trimmed_required_msg_1(required_msg_1);
+  FieldMaskUtil::FromString("dummy2", &mask);
+  options.set_keep_required_fields(true);
+  FieldMaskUtil::TrimMessage(mask, &trimmed_required_msg_1, options);
+  EXPECT_EQ(trimmed_required_msg_1.DebugString(), required_msg_1.DebugString());
+
+  // Test trim required fields with keep_required_fields is set false.
+  required_msg_1.clear_a();
+  required_msg_1.clear_b();
+  required_msg_1.clear_c();
+  options.set_keep_required_fields(false);
+  FieldMaskUtil::TrimMessage(mask, &trimmed_required_msg_1, options);
+  EXPECT_EQ(trimmed_required_msg_1.DebugString(), required_msg_1.DebugString());
+
+  // Test trim required message with keep_required_fields is set true.
+  TestRequiredMessage required_msg_2;
+  required_msg_2.mutable_optional_message()->set_a(1234);
+  required_msg_2.mutable_optional_message()->set_b(3456);
+  required_msg_2.mutable_optional_message()->set_c(5678);
+  required_msg_2.mutable_required_message()->set_a(1234);
+  required_msg_2.mutable_required_message()->set_b(3456);
+  required_msg_2.mutable_required_message()->set_c(5678);
+  required_msg_2.mutable_required_message()->set_dummy2(7890);
+  TestRequired* repeated_msg = required_msg_2.add_repeated_message();
+  repeated_msg->set_a(1234);
+  repeated_msg->set_b(3456);
+  repeated_msg->set_c(5678);
+  TestRequiredMessage trimmed_required_msg_2(required_msg_2);
+  FieldMaskUtil::FromString("optional_message.dummy2", &mask);
+  options.set_keep_required_fields(true);
+  required_msg_2.clear_repeated_message();
+  required_msg_2.mutable_required_message()->clear_dummy2();
+  FieldMaskUtil::TrimMessage(mask, &trimmed_required_msg_2, options);
+  EXPECT_EQ(trimmed_required_msg_2.DebugString(),
+            required_msg_2.DebugString());
+
+  FieldMaskUtil::FromString("required_message", &mask);
+  required_msg_2.mutable_required_message()->set_dummy2(7890);
+  trimmed_required_msg_2.mutable_required_message()->set_dummy2(7890);
+  required_msg_2.clear_optional_message();
+  FieldMaskUtil::TrimMessage(mask, &trimmed_required_msg_2, options);
+  EXPECT_EQ(trimmed_required_msg_2.DebugString(),
+            required_msg_2.DebugString());
+
+  // Test trim required message with keep_required_fields is set false.
+  FieldMaskUtil::FromString("required_message.dummy2", &mask);
+  required_msg_2.mutable_required_message()->clear_a();
+  required_msg_2.mutable_required_message()->clear_b();
+  required_msg_2.mutable_required_message()->clear_c();
+  options.set_keep_required_fields(false);
+  FieldMaskUtil::TrimMessage(mask, &trimmed_required_msg_2, options);
+  EXPECT_EQ(trimmed_required_msg_2.DebugString(),
+            required_msg_2.DebugString());
+
+  // Verify that trimming an empty message has no effect. In particular, fields
+  // mentioned in the field mask should not be created or changed.
+  TestAllTypes empty_msg;
+  FieldMaskUtil::FromString(
+      "optional_int32,optional_bytes,optional_nested_message.bb", &mask);
+  FieldMaskUtil::TrimMessage(mask, &empty_msg);
+  EXPECT_FALSE(empty_msg.has_optional_int32());
+  EXPECT_FALSE(empty_msg.has_optional_bytes());
+  EXPECT_FALSE(empty_msg.has_optional_nested_message());
+
+  // Verify trimming of oneof fields. This should work as expected even if
+  // multiple elements of the same oneof are included in the FieldMask.
+  TestAllTypes oneof_msg;
+  oneof_msg.set_oneof_uint32(11);
+  FieldMaskUtil::FromString("oneof_uint32,oneof_nested_message.bb", &mask);
+  FieldMaskUtil::TrimMessage(mask, &oneof_msg);
+  EXPECT_EQ(11, oneof_msg.oneof_uint32());
 }
 
 
diff --git a/src/google/protobuf/util/internal/datapiece.cc b/src/google/protobuf/util/internal/datapiece.cc
index 213c2c40..59bc28ae 100644
--- a/src/google/protobuf/util/internal/datapiece.cc
+++ b/src/google/protobuf/util/internal/datapiece.cc
@@ -64,9 +64,9 @@ StatusOr<To> ValidateNumberConversion(To after, From before) {
       MathUtil::Sign<From>(before) == MathUtil::Sign<To>(after)) {
     return after;
   } else {
-    return InvalidArgument(::google::protobuf::internal::is_integral<From>::value
+    return InvalidArgument(std::is_integral<From>::value
                                ? ValueAsString(before)
-                               : ::google::protobuf::internal::is_same<From, double>::value
+                               : std::is_same<From, double>::value
                                      ? DoubleAsString(before)
                                      : FloatAsString(before));
   }
@@ -77,7 +77,7 @@ StatusOr<To> ValidateNumberConversion(To after, From before) {
 // except conversion between double and float.
 template <typename To, typename From>
 StatusOr<To> NumberConvertAndCheck(From before) {
-  if (::google::protobuf::internal::is_same<From, To>::value) return before;
+  if (std::is_same<From, To>::value) return before;
 
   To after = static_cast<To>(before);
   return ValidateNumberConversion(after, before);
@@ -87,7 +87,7 @@ StatusOr<To> NumberConvertAndCheck(From before) {
 // point types (double, float) only.
 template <typename To, typename From>
 StatusOr<To> FloatingPointToIntConvertAndCheck(From before) {
-  if (::google::protobuf::internal::is_same<From, To>::value) return before;
+  if (std::is_same<From, To>::value) return before;
 
   To after = static_cast<To>(before);
   return ValidateNumberConversion(after, before);
@@ -272,7 +272,8 @@ StatusOr<string> DataPiece::ToBytes() const {
 }
 
 StatusOr<int> DataPiece::ToEnum(const google::protobuf::Enum* enum_type,
-                                bool use_lower_camel_for_enums) const {
+                                bool use_lower_camel_for_enums,
+                                bool ignore_unknown_enum_values) const {
   if (type_ == TYPE_NULL) return google::protobuf::NULL_VALUE;
 
   if (type_ == TYPE_STRING) {
@@ -280,7 +281,7 @@ StatusOr<int> DataPiece::ToEnum(const google::protobuf::Enum* enum_type,
     string enum_name = str_.ToString();
     const google::protobuf::EnumValue* value =
         FindEnumValueByNameOrNull(enum_type, enum_name);
-    if (value != NULL) return value->number();
+    if (value != nullptr) return value->number();
 
     // Check if int version of enum is sent as string.
     StatusOr<int32> int_value = ToInt32();
@@ -296,15 +297,19 @@ StatusOr<int> DataPiece::ToEnum(const google::protobuf::Enum* enum_type,
       *it = *it == '-' ? '_' : ascii_toupper(*it);
     }
     value = FindEnumValueByNameOrNull(enum_type, enum_name);
-    if (value != NULL) return value->number();
+    if (value != nullptr) return value->number();
 
     // If use_lower_camel_for_enums is true try with enum name without
     // underscore. This will also accept camel case names as the enum_name has
     // been normalized before.
     if (use_lower_camel_for_enums) {
       value = FindEnumValueByNameWithoutUnderscoreOrNull(enum_type, enum_name);
-      if (value != NULL) return value->number();
+      if (value != nullptr) return value->number();
     }
+
+    // If ignore_unknown_enum_values is true an unknown enum value is treated
+    // as the default
+    if (ignore_unknown_enum_values) return enum_type->enumvalue(0).number();
   } else {
     // We don't need to check whether the value is actually declared in the
     // enum because we preserve unknown enum values as well.
@@ -357,7 +362,8 @@ bool DataPiece::DecodeBase64(StringPiece src, string* dest) const {
       WebSafeBase64Escape(*dest, &encoded);
       // Remove trailing padding '=' characters before comparison.
       StringPiece src_no_padding = StringPiece(src).substr(
-          0, src.ends_with("=") ? src.find_last_not_of('=') + 1 : src.length());
+          0, StringEndsWith(src, "=") ? src.find_last_not_of('=') + 1
+                                      : src.length());
       return encoded == src_no_padding;
     }
     return true;
@@ -370,7 +376,8 @@ bool DataPiece::DecodeBase64(StringPiece src, string* dest) const {
           reinterpret_cast<const unsigned char*>(dest->data()), dest->length(),
           &encoded, false);
       StringPiece src_no_padding = StringPiece(src).substr(
-          0, src.ends_with("=") ? src.find_last_not_of('=') + 1 : src.length());
+          0, StringEndsWith(src, "=") ? src.find_last_not_of('=') + 1
+                                      : src.length());
       return encoded == src_no_padding;
     }
     return true;
diff --git a/src/google/protobuf/util/internal/datapiece.h b/src/google/protobuf/util/internal/datapiece.h
index 83516d09..95b133da 100644
--- a/src/google/protobuf/util/internal/datapiece.h
+++ b/src/google/protobuf/util/internal/datapiece.h
@@ -164,7 +164,8 @@ class LIBPROTOBUF_EXPORT DataPiece {
   // If the value is not a string, attempts to convert to a 32-bit integer.
   // If none of these succeeds, returns a conversion error status.
   util::StatusOr<int> ToEnum(const google::protobuf::Enum* enum_type,
-                               bool use_lower_camel_for_enums) const;
+                               bool use_lower_camel_for_enums,
+                               bool ignore_unknown_enum_values) const;
 
  private:
   // Disallow implicit constructor.
diff --git a/src/google/protobuf/util/internal/default_value_objectwriter.cc b/src/google/protobuf/util/internal/default_value_objectwriter.cc
index 1772219a..b41feb7a 100644
--- a/src/google/protobuf/util/internal/default_value_objectwriter.cc
+++ b/src/google/protobuf/util/internal/default_value_objectwriter.cc
@@ -62,10 +62,12 @@ DefaultValueObjectWriter::DefaultValueObjectWriter(
     : typeinfo_(TypeInfo::NewTypeInfo(type_resolver)),
       own_typeinfo_(true),
       type_(type),
-      current_(NULL),
-      root_(NULL),
+      current_(nullptr),
+      root_(nullptr),
       suppress_empty_list_(false),
-      field_scrub_callback_(NULL),
+      preserve_proto_field_names_(false),
+      use_ints_for_enums_(false),
+      field_scrub_callback_(nullptr),
       ow_(ow) {}
 
 DefaultValueObjectWriter::~DefaultValueObjectWriter() {
@@ -79,7 +81,7 @@ DefaultValueObjectWriter::~DefaultValueObjectWriter() {
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderBool(StringPiece name,
                                                                bool value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderBool(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -89,7 +91,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderBool(StringPiece name,
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderInt32(
     StringPiece name, int32 value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderInt32(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -99,7 +101,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderInt32(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderUint32(
     StringPiece name, uint32 value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderUint32(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -109,7 +111,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderUint32(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderInt64(
     StringPiece name, int64 value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderInt64(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -119,7 +121,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderInt64(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderUint64(
     StringPiece name, uint64 value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderUint64(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -129,7 +131,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderUint64(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderDouble(
     StringPiece name, double value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderDouble(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -139,7 +141,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderDouble(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderFloat(
     StringPiece name, float value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderBool(name, value);
   } else {
     RenderDataPiece(name, DataPiece(value));
@@ -149,7 +151,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderFloat(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderString(
     StringPiece name, StringPiece value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderString(name, value);
   } else {
     // Since StringPiece is essentially a pointer, takes a copy of "value" to
@@ -162,7 +164,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderString(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderBytes(
     StringPiece name, StringPiece value) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderBytes(name, value);
   } else {
     // Since StringPiece is essentially a pointer, takes a copy of "value" to
@@ -175,7 +177,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::RenderBytes(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::RenderNull(
     StringPiece name) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ow_->RenderNull(name);
   } else {
     RenderDataPiece(name, DataPiece::NullData());
@@ -188,6 +190,24 @@ void DefaultValueObjectWriter::RegisterFieldScrubCallBack(
   field_scrub_callback_.reset(field_scrub_callback.release());
 }
 
+DefaultValueObjectWriter::Node* DefaultValueObjectWriter::CreateNewNode(
+    const string& name, const google::protobuf::Type* type, NodeKind kind,
+    const DataPiece& data, bool is_placeholder, const std::vector<string>& path,
+    bool suppress_empty_list, FieldScrubCallBack* field_scrub_callback) {
+  return new Node(name, type, kind, data, is_placeholder, path,
+                  suppress_empty_list, field_scrub_callback);
+}
+
+DefaultValueObjectWriter::Node* DefaultValueObjectWriter::CreateNewNode(
+    const string& name, const google::protobuf::Type* type, NodeKind kind,
+    const DataPiece& data, bool is_placeholder, const std::vector<string>& path,
+    bool suppress_empty_list, bool preserve_proto_field_names, bool use_ints_for_enums,
+    FieldScrubCallBack* field_scrub_callback) {
+  return new Node(name, type, kind, data, is_placeholder, path,
+                  suppress_empty_list, preserve_proto_field_names, use_ints_for_enums,
+                  field_scrub_callback);
+}
+
 DefaultValueObjectWriter::Node::Node(
     const string& name, const google::protobuf::Type* type, NodeKind kind,
     const DataPiece& data, bool is_placeholder, const std::vector<string>& path,
@@ -200,12 +220,31 @@ DefaultValueObjectWriter::Node::Node(
       is_placeholder_(is_placeholder),
       path_(path),
       suppress_empty_list_(suppress_empty_list),
+      preserve_proto_field_names_(false),
+      use_ints_for_enums_(false),
+      field_scrub_callback_(field_scrub_callback) {}
+
+DefaultValueObjectWriter::Node::Node(
+    const string& name, const google::protobuf::Type* type, NodeKind kind,
+    const DataPiece& data, bool is_placeholder, const std::vector<string>& path,
+    bool suppress_empty_list, bool preserve_proto_field_names, bool use_ints_for_enums,
+    FieldScrubCallBack* field_scrub_callback)
+    : name_(name),
+      type_(type),
+      kind_(kind),
+      is_any_(false),
+      data_(data),
+      is_placeholder_(is_placeholder),
+      path_(path),
+      suppress_empty_list_(suppress_empty_list),
+      preserve_proto_field_names_(preserve_proto_field_names),
+      use_ints_for_enums_(use_ints_for_enums),
       field_scrub_callback_(field_scrub_callback) {}
 
 DefaultValueObjectWriter::Node* DefaultValueObjectWriter::Node::FindChild(
     StringPiece name) {
   if (name.empty() || kind_ != OBJECT) {
-    return NULL;
+    return nullptr;
   }
   for (int i = 0; i < children_.size(); ++i) {
     Node* child = children_[i];
@@ -213,7 +252,7 @@ DefaultValueObjectWriter::Node* DefaultValueObjectWriter::Node::FindChild(
       return child;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 void DefaultValueObjectWriter::Node::WriteTo(ObjectWriter* ow) {
@@ -281,7 +320,7 @@ const google::protobuf::Type* DefaultValueObjectWriter::Node::GetMapValueType(
     }
     break;
   }
-  return NULL;
+  return nullptr;
 }
 
 void DefaultValueObjectWriter::Node::PopulateChildren(
@@ -292,7 +331,7 @@ void DefaultValueObjectWriter::Node::PopulateChildren(
   // TODO(tsun): remove "kStructValueType" from the list. It's being checked
   //     now because of a bug in the tool-chain that causes the "oneof_index"
   //     of kStructValueType to not be set correctly.
-  if (type_ == NULL || type_->name() == kAnyType ||
+  if (type_ == nullptr || type_->name() == kAnyType ||
       type_->name() == kStructType || type_->name() == kTimestampType ||
       type_->name() == kDurationType || type_->name() == kStructValueType) {
     return;
@@ -315,7 +354,7 @@ void DefaultValueObjectWriter::Node::PopulateChildren(
       path.insert(path.begin(), path_.begin(), path_.end());
     }
     path.push_back(field.name());
-    if (field_scrub_callback_ != NULL &&
+    if (field_scrub_callback_ != nullptr &&
         field_scrub_callback_->Run(path, &field)) {
       continue;
     }
@@ -326,11 +365,11 @@ void DefaultValueObjectWriter::Node::PopulateChildren(
     // of children.
     if (found != orig_children_map.end()) {
       new_children.push_back(children_[found->second]);
-      children_[found->second] = NULL;
+      children_[found->second] = nullptr;
       continue;
     }
 
-    const google::protobuf::Type* field_type = NULL;
+    const google::protobuf::Type* field_type = nullptr;
     bool is_map = false;
     NodeKind kind = PRIMITIVE;
 
@@ -363,25 +402,28 @@ void DefaultValueObjectWriter::Node::PopulateChildren(
     }
 
     // If oneof_index() != 0, the child field is part of a "oneof", which means
-    // the child field is optional and we shouldn't populate its default value.
-    if (field.oneof_index() != 0) continue;
+    // the child field is optional and we shouldn't populate its default
+    // primitive value.
+    if (field.oneof_index() != 0 && kind == PRIMITIVE) continue;
 
     // If the child field is of primitive type, sets its data to the default
     // value of its type.
-    google::protobuf::scoped_ptr<Node> child(new Node(
-        field.json_name(), field_type, kind,
-        kind == PRIMITIVE ? CreateDefaultDataPieceForField(field, typeinfo)
+    std::unique_ptr<Node> child(new Node(
+        preserve_proto_field_names_ ? field.name() : field.json_name(),
+        field_type, kind,
+        kind == PRIMITIVE ? CreateDefaultDataPieceForField(field, typeinfo, use_ints_for_enums_)
                           : DataPiece::NullData(),
-        true, path, suppress_empty_list_, field_scrub_callback_));
+        true, path, suppress_empty_list_, preserve_proto_field_names_, use_ints_for_enums_,
+        field_scrub_callback_));
     new_children.push_back(child.release());
   }
   // Adds all leftover nodes in children_ to the beginning of new_child.
   for (int i = 0; i < children_.size(); ++i) {
-    if (children_[i] == NULL) {
+    if (children_[i] == nullptr) {
       continue;
     }
     new_children.insert(new_children.begin(), children_[i]);
-    children_[i] = NULL;
+    children_[i] = nullptr;
   }
   children_.swap(new_children);
 }
@@ -389,14 +431,14 @@ void DefaultValueObjectWriter::Node::PopulateChildren(
 void DefaultValueObjectWriter::MaybePopulateChildrenOfAny(Node* node) {
   // If this is an "Any" node with "@type" already given and no other children
   // have been added, populates its children.
-  if (node != NULL && node->is_any() && node->type() != NULL &&
+  if (node != nullptr && node->is_any() && node->type() != nullptr &&
       node->type()->name() != kAnyType && node->number_of_children() == 1) {
     node->PopulateChildren(typeinfo_);
   }
 }
 
 DataPiece DefaultValueObjectWriter::FindEnumDefault(
-    const google::protobuf::Field& field, const TypeInfo* typeinfo) {
+    const google::protobuf::Field& field, const TypeInfo* typeinfo, bool use_ints_for_enums) {
   if (!field.default_value().empty())
     return DataPiece(field.default_value(), true);
 
@@ -409,12 +451,12 @@ DataPiece DefaultValueObjectWriter::FindEnumDefault(
   }
   // We treat the first value as the default if none is specified.
   return enum_type->enumvalue_size() > 0
-             ? DataPiece(enum_type->enumvalue(0).name(), true)
+             ? (use_ints_for_enums ? DataPiece(enum_type->enumvalue(0).number()) : DataPiece(enum_type->enumvalue(0).name(), true))
              : DataPiece::NullData();
 }
 
 DataPiece DefaultValueObjectWriter::CreateDefaultDataPieceForField(
-    const google::protobuf::Field& field, const TypeInfo* typeinfo) {
+    const google::protobuf::Field& field, const TypeInfo* typeinfo, bool use_ints_for_enums) {
   switch (field.kind()) {
     case google::protobuf::Field_Kind_TYPE_DOUBLE: {
       return DataPiece(ConvertTo<double>(
@@ -457,7 +499,7 @@ DataPiece DefaultValueObjectWriter::CreateDefaultDataPieceForField(
           field.default_value(), &DataPiece::ToUint32, static_cast<uint32>(0)));
     }
     case google::protobuf::Field_Kind_TYPE_ENUM: {
-      return FindEnumDefault(field, typeinfo);
+      return FindEnumDefault(field, typeinfo, use_ints_for_enums);
     }
     default: { return DataPiece::NullData(); }
   }
@@ -465,27 +507,30 @@ DataPiece DefaultValueObjectWriter::CreateDefaultDataPieceForField(
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::StartObject(
     StringPiece name) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     std::vector<string> path;
-    root_.reset(new Node(name.ToString(), &type_, OBJECT, DataPiece::NullData(),
-                         false, path, suppress_empty_list_,
-                         field_scrub_callback_.get()));
+    root_.reset(CreateNewNode(string(name), &type_, OBJECT,
+                              DataPiece::NullData(), false, path,
+                              suppress_empty_list_, preserve_proto_field_names_, use_ints_for_enums_,
+                              field_scrub_callback_.get()));
     root_->PopulateChildren(typeinfo_);
     current_ = root_.get();
     return this;
   }
   MaybePopulateChildrenOfAny(current_);
   Node* child = current_->FindChild(name);
-  if (current_->kind() == LIST || current_->kind() == MAP || child == NULL) {
+  if (current_->kind() == LIST || current_->kind() == MAP || child == nullptr) {
     // If current_ is a list or a map node, we should create a new child and use
     // the type of current_ as the type of the new child.
-    google::protobuf::scoped_ptr<Node> node(new Node(
-        name.ToString(), ((current_->kind() == LIST || current_->kind() == MAP)
-                              ? current_->type()
-                              : NULL),
-        OBJECT, DataPiece::NullData(), false,
-        child == NULL ? current_->path() : child->path(),
-        suppress_empty_list_, field_scrub_callback_.get()));
+    std::unique_ptr<Node> node(
+        CreateNewNode(string(name),
+                      ((current_->kind() == LIST || current_->kind() == MAP)
+                           ? current_->type()
+                           : nullptr),
+                      OBJECT, DataPiece::NullData(), false,
+                      child == nullptr ? current_->path() : child->path(),
+                      suppress_empty_list_, preserve_proto_field_names_, use_ints_for_enums_,
+                      field_scrub_callback_.get()));
     child = node.get();
     current_->AddChild(node.release());
   }
@@ -513,21 +558,23 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::EndObject() {
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::StartList(
     StringPiece name) {
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     std::vector<string> path;
-    root_.reset(new Node(name.ToString(), &type_, LIST, DataPiece::NullData(),
-                         false, path, suppress_empty_list_,
-                         field_scrub_callback_.get()));
+    root_.reset(CreateNewNode(string(name), &type_, LIST, DataPiece::NullData(),
+                              false, path, suppress_empty_list_,
+                              preserve_proto_field_names_, use_ints_for_enums_,
+                              field_scrub_callback_.get()));
     current_ = root_.get();
     return this;
   }
   MaybePopulateChildrenOfAny(current_);
   Node* child = current_->FindChild(name);
-  if (child == NULL || child->kind() != LIST) {
-    google::protobuf::scoped_ptr<Node> node(
-        new Node(name.ToString(), NULL, LIST, DataPiece::NullData(), false,
-                 child == NULL ? current_->path() : child->path(),
-                 suppress_empty_list_, field_scrub_callback_.get()));
+  if (child == nullptr || child->kind() != LIST) {
+    std::unique_ptr<Node> node(
+        CreateNewNode(string(name), nullptr, LIST, DataPiece::NullData(), false,
+                      child == nullptr ? current_->path() : child->path(),
+                      suppress_empty_list_, preserve_proto_field_names_, use_ints_for_enums_,
+                      field_scrub_callback_.get()));
     child = node.get();
     current_->AddChild(node.release());
   }
@@ -540,8 +587,8 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::StartList(
 
 void DefaultValueObjectWriter::WriteRoot() {
   root_->WriteTo(ow_);
-  root_.reset(NULL);
-  current_ = NULL;
+  root_.reset(nullptr);
+  current_ = nullptr;
 }
 
 DefaultValueObjectWriter* DefaultValueObjectWriter::EndList() {
@@ -557,7 +604,7 @@ DefaultValueObjectWriter* DefaultValueObjectWriter::EndList() {
 void DefaultValueObjectWriter::RenderDataPiece(StringPiece name,
                                                const DataPiece& data) {
   MaybePopulateChildrenOfAny(current_);
-  if (current_->type() != NULL && current_->type()->name() == kAnyType &&
+  if (current_->type() != nullptr && current_->type()->name() == kAnyType &&
       name == "@type") {
     util::StatusOr<string> data_string = data.ToString();
     if (data_string.ok()) {
@@ -577,21 +624,23 @@ void DefaultValueObjectWriter::RenderDataPiece(StringPiece name,
       // other children of primitive type now. Otherwise, we should wait until
       // the first value field is rendered before we populate the children,
       // because the "value" field of a Any message could be omitted.
-      if (current_->number_of_children() > 1 && current_->type() != NULL) {
+      if (current_->number_of_children() > 1 && current_->type() != nullptr) {
         current_->PopulateChildren(typeinfo_);
       }
     }
   }
   Node* child = current_->FindChild(name);
-  if (child == NULL || child->kind() != PRIMITIVE) {
+  if (child == nullptr || child->kind() != PRIMITIVE) {
     // No children are found, creates a new child.
-    google::protobuf::scoped_ptr<Node> node(
-        new Node(name.ToString(), NULL, PRIMITIVE, data, false,
-                 child == NULL ? current_->path() : child->path(),
-                 suppress_empty_list_, field_scrub_callback_.get()));
+    std::unique_ptr<Node> node(
+        CreateNewNode(string(name), nullptr, PRIMITIVE, data, false,
+                      child == nullptr ? current_->path() : child->path(),
+                      suppress_empty_list_, preserve_proto_field_names_, use_ints_for_enums_,
+                      field_scrub_callback_.get()));
     current_->AddChild(node.release());
   } else {
     child->set_data(data);
+    child->set_is_placeholder(false);
   }
 }
 
diff --git a/src/google/protobuf/util/internal/default_value_objectwriter.h b/src/google/protobuf/util/internal/default_value_objectwriter.h
index dc4551c9..6e71f9c8 100644
--- a/src/google/protobuf/util/internal/default_value_objectwriter.h
+++ b/src/google/protobuf/util/internal/default_value_objectwriter.h
@@ -32,9 +32,6 @@
 #define GOOGLE_PROTOBUF_UTIL_CONVERTER_DEFAULT_VALUE_OBJECTWRITER_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <stack>
 #include <vector>
 
@@ -77,7 +74,7 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
       FieldScrubCallBack;
 
   // A unique pointer to a DefaultValueObjectWriter::FieldScrubCallBack.
-  typedef google::protobuf::scoped_ptr<FieldScrubCallBack> FieldScrubCallBackPtr;
+  typedef std::unique_ptr<FieldScrubCallBack> FieldScrubCallBackPtr;
 
   DefaultValueObjectWriter(TypeResolver* type_resolver,
                            const google::protobuf::Type& type,
@@ -126,7 +123,18 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
   // are written.
   void set_suppress_empty_list(bool value) { suppress_empty_list_ = value; }
 
- private:
+  // If set to true, original proto field names are used
+  void set_preserve_proto_field_names(bool value) {
+    preserve_proto_field_names_ = value;
+  }
+
+  // If set to true, enums are rendered as ints from output when default values
+  // are written.
+  void set_print_enums_as_ints(bool value) {
+    use_ints_for_enums_ = value;
+  }
+
+ protected:
   enum NodeKind {
     PRIMITIVE = 0,
     OBJECT = 1,
@@ -142,6 +150,11 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
          const DataPiece& data, bool is_placeholder,
          const std::vector<string>& path, bool suppress_empty_list,
          FieldScrubCallBack* field_scrub_callback);
+    Node(const string& name, const google::protobuf::Type* type, NodeKind kind,
+         const DataPiece& data, bool is_placeholder,
+         const std::vector<string>& path, bool suppress_empty_list,
+         bool preserve_proto_field_names, bool use_ints_for_enums,
+         FieldScrubCallBack* field_scrub_callback);
     virtual ~Node() {
       for (int i = 0; i < children_.size(); ++i) {
         delete children_[i];
@@ -157,12 +170,12 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
     // Populates children of this Node based on its type. If there are already
     // children created, they will be merged to the result. Caller should pass
     // in TypeInfo for looking up types of the children.
-    void PopulateChildren(const TypeInfo* typeinfo);
+    virtual void PopulateChildren(const TypeInfo* typeinfo);
 
     // If this node is a leaf (has data), writes the current node to the
     // ObjectWriter; if not, then recursively writes the children to the
     // ObjectWriter.
-    void WriteTo(ObjectWriter* ow);
+    virtual void WriteTo(ObjectWriter* ow);
 
     // Accessors
     const string& name() const { return name_; }
@@ -187,7 +200,7 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
       is_placeholder_ = is_placeholder;
     }
 
-   private:
+   protected:
     // Returns the Value Type of a map given the Type of the map entry and a
     // TypeInfo instance.
     const google::protobuf::Type* GetMapValueType(
@@ -220,25 +233,55 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
     // Whether to suppress empty list output.
     bool suppress_empty_list_;
 
+    // Whether to preserve original proto field names
+    bool preserve_proto_field_names_;
+
+    // Whether to always print enums as ints
+    bool use_ints_for_enums_;
+
     // Pointer to function for determining whether a field needs to be scrubbed
     // or not. This callback is owned by the creator of this node.
     FieldScrubCallBack* field_scrub_callback_;
 
+   private:
     GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Node);
   };
 
+  // Creates a new Node and returns it. Caller owns memory of returned object.
+  virtual Node* CreateNewNode(const string& name,
+                              const google::protobuf::Type* type, NodeKind kind,
+                              const DataPiece& data, bool is_placeholder,
+                              const std::vector<string>& path,
+                              bool suppress_empty_list,
+                              FieldScrubCallBack* field_scrub_callback);
+
+  // Creates a new Node and returns it. Caller owns memory of returned object.
+  virtual Node* CreateNewNode(const string& name,
+                              const google::protobuf::Type* type, NodeKind kind,
+                              const DataPiece& data, bool is_placeholder,
+                              const std::vector<string>& path,
+                              bool suppress_empty_list,
+                              bool preserve_proto_field_names,
+                              bool use_ints_for_enums,
+                              FieldScrubCallBack* field_scrub_callback);
+
+  // Creates a DataPiece containing the default value of the type of the field.
+  static DataPiece CreateDefaultDataPieceForField(
+      const google::protobuf::Field& field, const TypeInfo* typeinfo, bool use_ints_for_enums);
+
+ protected:
+  // Returns a pointer to current Node in tree.
+  Node* current() { return current_; }
+
+ private:
   // Populates children of "node" if it is an "any" Node and its real type has
   // been given.
   void MaybePopulateChildrenOfAny(Node* node);
 
   // Writes the root_ node to ow_ and resets the root_ and current_ pointer to
-  // NULL.
+  // nullptr.
   void WriteRoot();
 
-  // Creates a DataPiece containing the default value of the type of the field.
-  static DataPiece CreateDefaultDataPieceForField(
-      const google::protobuf::Field& field, const TypeInfo* typeinfo);
-
   // Adds or replaces the data_ of a primitive child node.
   void RenderDataPiece(StringPiece name, const DataPiece& data);
 
@@ -246,7 +289,8 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
   // there is no default. For proto3, where we cannot specify an explicit
   // default, a zero value will always be returned.
   static DataPiece FindEnumDefault(const google::protobuf::Field& field,
-                                   const TypeInfo* typeinfo);
+                                   const TypeInfo* typeinfo,
+                                   bool use_ints_for_enums);
 
   // Type information for all the types used in the descriptor. Used to find
   // google::protobuf::Type of nested messages/enums.
@@ -261,13 +305,19 @@ class LIBPROTOBUF_EXPORT DefaultValueObjectWriter : public ObjectWriter {
   // The current Node. Owned by its parents.
   Node* current_;
   // The root Node.
-  google::protobuf::scoped_ptr<Node> root_;
+  std::unique_ptr<Node> root_;
   // The stack to hold the path of Nodes from current_ to root_;
   std::stack<Node*> stack_;
 
   // Whether to suppress output of empty lists.
   bool suppress_empty_list_;
 
+  // Whether to preserve original proto field names
+  bool preserve_proto_field_names_;
+
+  // Whether to always print enums as ints
+  bool use_ints_for_enums_;
+
   // Unique Pointer to function for determining whether a field needs to be
   // scrubbed or not.
   FieldScrubCallBackPtr field_scrub_callback_;
diff --git a/src/google/protobuf/util/internal/default_value_objectwriter_test.cc b/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
index e1dd697a..0c4af61b 100644
--- a/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
+++ b/src/google/protobuf/util/internal/default_value_objectwriter_test.cc
@@ -60,7 +60,7 @@ class BaseDefaultValueObjectWriterTest
   TypeInfoTestHelper helper_;
   MockObjectWriter mock_;
   ExpectingObjectWriter expects_;
-  google::protobuf::scoped_ptr<DefaultValueObjectWriter> testing_;
+  std::unique_ptr<DefaultValueObjectWriter> testing_;
 };
 
 // Tests to cover some basic DefaultValueObjectWriter use cases. More tests are
@@ -156,7 +156,7 @@ class DefaultValueObjectWriterSuppressListTest
       : BaseDefaultValueObjectWriterTest(DefaultValueTest::descriptor()) {
     testing_->set_suppress_empty_list(true);
   }
-  ~DefaultValueObjectWriterSuppressListTest() {}
+  ~DefaultValueObjectWriterSuppressListTest() override {}
 };
 
 INSTANTIATE_TEST_CASE_P(DifferentTypeInfoSourceTest,
diff --git a/src/google/protobuf/util/internal/error_listener.h b/src/google/protobuf/util/internal/error_listener.h
index 1dc814a3..a19bd3f7 100644
--- a/src/google/protobuf/util/internal/error_listener.h
+++ b/src/google/protobuf/util/internal/error_listener.h
@@ -33,9 +33,6 @@
 
 #include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 
diff --git a/src/google/protobuf/util/internal/field_mask_utility.cc b/src/google/protobuf/util/internal/field_mask_utility.cc
index 53b90fb0..778a4510 100644
--- a/src/google/protobuf/util/internal/field_mask_utility.cc
+++ b/src/google/protobuf/util/internal/field_mask_utility.cc
@@ -30,6 +30,7 @@
 
 #include <google/protobuf/util/internal/field_mask_utility.h>
 
+#include <google/protobuf/util/internal/utility.h>
 #include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/status_macros.h>
 
@@ -44,11 +45,6 @@ inline util::Status CallPathSink(PathSinkCallback path_sink,
   return path_sink->Run(arg);
 }
 
-util::Status CreatePublicError(util::error::Code code,
-                                 const string& message) {
-  return util::Status(code, message);
-}
-
 // Appends a FieldMask path segment to a prefix.
 string AppendPathSegmentToPrefix(StringPiece prefix, StringPiece segment) {
   if (prefix.empty()) {
@@ -58,7 +54,7 @@ string AppendPathSegmentToPrefix(StringPiece prefix, StringPiece segment) {
     return prefix.ToString();
   }
   // If the segment is a map key, appends it to the prefix without the ".".
-  if (segment.starts_with("[\"")) {
+  if (StringStartsWith(segment, "[\"")) {
     return StrCat(prefix, segment);
   }
   return StrCat(prefix, ".", segment);
@@ -216,7 +212,7 @@ util::Status DecodeCompactFieldMaskPaths(StringPiece paths,
                           StrCat("Invalid FieldMask '", paths,
                                  "'. Cannot find matching ')' for all '('."));
   }
-  return util::Status::OK;
+  return util::Status();
 }
 
 }  // namespace converter
diff --git a/src/google/protobuf/util/internal/json_escaping.cc b/src/google/protobuf/util/internal/json_escaping.cc
index 47e4dd6d..06b9a7f2 100644
--- a/src/google/protobuf/util/internal/json_escaping.cc
+++ b/src/google/protobuf/util/internal/json_escaping.cc
@@ -84,30 +84,6 @@ static const char kCommonEscapes[160][7] = {
   "\\u009c", "\\u009d", "\\u009e", "\\u009f"
 };
 
-// Determines if the given char value is a unicode high-surrogate code unit.
-// Such values do not represent characters by themselves, but are used in the
-// representation of supplementary characters in the utf-16 encoding.
-inline bool IsHighSurrogate(uint16 c) {
-  // Optimized form of:
-  // return c >= kMinHighSurrogate && c <= kMaxHighSurrogate;
-  // (Reduced from 3 ALU instructions to 2 ALU instructions)
-  return (c & ~(JsonEscaping::kMaxHighSurrogate -
-                JsonEscaping::kMinHighSurrogate))
-      == JsonEscaping::kMinHighSurrogate;
-}
-
-// Determines if the given char value is a unicode low-surrogate code unit.
-// Such values do not represent characters by themselves, but are used in the
-// representation of supplementary characters in the utf-16 encoding.
-inline bool IsLowSurrogate(uint16 c) {
-  // Optimized form of:
-  // return c >= kMinLowSurrogate && c <= kMaxLowSurrogate;
-  // (Reduced from 3 ALU instructions to 2 ALU instructions)
-  return (c & ~(JsonEscaping::kMaxLowSurrogate -
-                JsonEscaping::kMinLowSurrogate))
-      == JsonEscaping::kMinLowSurrogate;
-}
-
 // Determines if the given char value is a unicode surrogate code unit (either
 // high-surrogate or low-surrogate).
 inline bool IsSurrogate(uint32 c) {
@@ -117,36 +93,12 @@ inline bool IsSurrogate(uint32 c) {
   return (c & 0xfffff800) == JsonEscaping::kMinHighSurrogate;
 }
 
-// Returns true if the given unicode code point cp is
-// in the supplementary character range.
-inline bool IsSupplementalCodePoint(uint32 cp) {
-  // Optimized form of:
-  // return kMinSupplementaryCodePoint <= cp && cp <= kMaxCodePoint;
-  // (Reduced from 3 ALU instructions to 2 ALU instructions)
-  return (cp & ~(JsonEscaping::kMinSupplementaryCodePoint - 1))
-      < JsonEscaping::kMaxCodePoint;
-}
-
 // Returns true if the given unicode code point cp is a valid
 // unicode code point (i.e. in the range 0 <= cp <= kMaxCodePoint).
 inline bool IsValidCodePoint(uint32 cp) {
   return cp <= JsonEscaping::kMaxCodePoint;
 }
 
-// Converts the specified surrogate pair to its supplementary code point value.
-// It is the callers' responsibility to validate the specified surrogate pair.
-inline uint32 ToCodePoint(uint16 high, uint16 low) {
-  // Optimized form of:
-  // return ((high - kMinHighSurrogate) << 10)
-  //     + (low - kMinLowSurrogate)
-  //     + kMinSupplementaryCodePoint;
-  // (Reduced from 5 ALU instructions to 3 ALU instructions)
-  return (high << 10) + low +
-      (JsonEscaping::kMinSupplementaryCodePoint
-       - (static_cast<unsigned>(JsonEscaping::kMinHighSurrogate) << 10)
-       - JsonEscaping::kMinLowSurrogate);
-}
-
 // Returns the low surrogate for the given unicode code point. The result is
 // meaningless if the given code point is not a supplementary character.
 inline uint16 ToLowSurrogate(uint32 cp) {
@@ -255,7 +207,7 @@ StringPiece ToHex(uint16 cp, char* buffer) {
   buffer[3] = kHex[cp & 0x0f];
   cp >>= 4;
   buffer[2] = kHex[cp & 0x0f];
-  return StringPiece(buffer).substr(0, 6);
+  return StringPiece(buffer, 6);
 }
 
 // Stores the 32-bit unicode code point as its hexadecimal digits in buffer
diff --git a/src/google/protobuf/util/internal/json_escaping.h b/src/google/protobuf/util/internal/json_escaping.h
index e3e329fc..5495c57f 100644
--- a/src/google/protobuf/util/internal/json_escaping.h
+++ b/src/google/protobuf/util/internal/json_escaping.h
@@ -28,8 +28,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef NET_PROTO2_UTIL_CONVERTER_STRINGS_JSON_ESCAPING_H_
-#define NET_PROTO2_UTIL_CONVERTER_STRINGS_JSON_ESCAPING_H_
+#ifndef GOOGLE_PROTOBUF_UTIL_INTERNAL__JSON_ESCAPING_H__
+#define GOOGLE_PROTOBUF_UTIL_INTERNAL__JSON_ESCAPING_H__
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/bytestream.h>
@@ -87,5 +87,5 @@ class JsonEscaping {
 }  // namespace util
 }  // namespace protobuf
 
-#endif  // NET_PROTO2_UTIL_CONVERTER_STRINGS_JSON_ESCAPING_H_
 }  // namespace google
+#endif  // GOOGLE_PROTOBUF_UTIL_INTERNAL__JSON_ESCAPING_H__
diff --git a/src/google/protobuf/util/internal/json_objectwriter.cc b/src/google/protobuf/util/internal/json_objectwriter.cc
index 6e4edd88..a431177a 100644
--- a/src/google/protobuf/util/internal/json_objectwriter.cc
+++ b/src/google/protobuf/util/internal/json_objectwriter.cc
@@ -57,7 +57,7 @@ JsonObjectWriter::~JsonObjectWriter() {
 JsonObjectWriter* JsonObjectWriter::StartObject(StringPiece name) {
   WritePrefix(name);
   WriteChar('{');
-  Push();
+  PushObject();
   return this;
 }
 
@@ -71,7 +71,7 @@ JsonObjectWriter* JsonObjectWriter::EndObject() {
 JsonObjectWriter* JsonObjectWriter::StartList(StringPiece name) {
   WritePrefix(name);
   WriteChar('[');
-  Push();
+  PushArray();
   return this;
 }
 
@@ -172,8 +172,7 @@ void JsonObjectWriter::WritePrefix(StringPiece name) {
   bool not_first = !element()->is_first();
   if (not_first) WriteChar(',');
   if (not_first || !element()->is_root()) NewLine();
-  bool empty_key_ok = GetAndResetEmptyKeyOk();
-  if (!name.empty() || empty_key_ok) {
+  if (!name.empty() || element()->is_json_object()) {
     WriteChar('"');
     if (!name.empty()) {
       ArrayByteSource source(name);
@@ -184,12 +183,6 @@ void JsonObjectWriter::WritePrefix(StringPiece name) {
   }
 }
 
-bool JsonObjectWriter::GetAndResetEmptyKeyOk() {
-  bool retval = empty_name_ok_for_next_key_;
-  empty_name_ok_for_next_key_ = false;
-  return retval;
-}
-
 }  // namespace converter
 }  // namespace util
 }  // namespace protobuf
diff --git a/src/google/protobuf/util/internal/json_objectwriter.h b/src/google/protobuf/util/internal/json_objectwriter.h
index 31edc292..81644dab 100644
--- a/src/google/protobuf/util/internal/json_objectwriter.h
+++ b/src/google/protobuf/util/internal/json_objectwriter.h
@@ -32,9 +32,6 @@
 #define GOOGLE_PROTOBUF_UTIL_CONVERTER_JSON_OBJECTWRITER_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 
 #include <google/protobuf/io/coded_stream.h>
@@ -89,12 +86,11 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
  public:
   JsonObjectWriter(StringPiece indent_string,
                    google::protobuf::io::CodedOutputStream* out)
-      : element_(new Element(NULL)),
+      : element_(new Element(/*parent=*/nullptr, /*is_json_object=*/false)),
         stream_(out),
         sink_(out),
         indent_string_(indent_string.ToString()),
-        use_websafe_base64_for_bytes_(false),
-        empty_name_ok_for_next_key_(false) {}
+        use_websafe_base64_for_bytes_(false) {}
   virtual ~JsonObjectWriter();
 
   // ObjectWriter methods.
@@ -118,17 +114,13 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
     use_websafe_base64_for_bytes_ = value;
   }
 
-  // Whether empty strings should be rendered for the next JSON key. This
-  // setting is only valid until the next key is rendered, after which it gets
-  // reset to false.
-  virtual void empty_name_ok_for_next_key() {
-    empty_name_ok_for_next_key_ = true;
-  }
-
  protected:
   class LIBPROTOBUF_EXPORT Element : public BaseElement {
    public:
-    explicit Element(Element* parent) : BaseElement(parent), is_first_(true) {}
+    Element(Element* parent, bool is_json_object)
+        : BaseElement(parent),
+          is_first_(true),
+          is_json_object_(is_json_object) {}
 
     // Called before each field of the Element is to be processed.
     // Returns true if this is the first call (processing the first field).
@@ -140,8 +132,13 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
       return false;
     }
 
+    // Whether we are currently renderring inside a JSON object (i.e., between
+    // StartObject() and EndObject()).
+    bool is_json_object() const { return is_json_object_; }
+
    private:
     bool is_first_;
+    bool is_json_object_;
 
     GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(Element);
   };
@@ -175,8 +172,15 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
     return this;
   }
 
-  // Pushes a new element to the stack.
-  void Push() { element_.reset(new Element(element_.release())); }
+  // Pushes a new JSON array element to the stack.
+  void PushArray() {
+    element_.reset(new Element(element_.release(), /*is_json_object=*/false));
+  }
+
+  // Pushes a new JSON object element to the stack.
+  void PushObject() {
+    element_.reset(new Element(element_.release(), /*is_json_object=*/true));
+  }
 
   // Pops an element off of the stack and deletes the popped element.
   void Pop() {
@@ -204,11 +208,7 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
   // Writes an individual character to the output.
   void WriteChar(const char c) { stream_->WriteRaw(&c, sizeof(c)); }
 
-  // Returns the current value of empty_name_ok_for_next_key_ and resets it to
-  // false.
-  bool GetAndResetEmptyKeyOk();
-
-  google::protobuf::scoped_ptr<Element> element_;
+  std::unique_ptr<Element> element_;
   google::protobuf::io::CodedOutputStream* stream_;
   ByteSinkWrapper sink_;
   const string indent_string_;
@@ -217,11 +217,6 @@ class LIBPROTOBUF_EXPORT JsonObjectWriter : public StructuredObjectWriter {
   // to regular base64 encoding.
   bool use_websafe_base64_for_bytes_;
 
-  // Whether empty strings should be rendered for the next JSON key. This
-  // setting is only valid until the next key is rendered, after which it gets
-  // reset to false.
-  bool empty_name_ok_for_next_key_;
-
   GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(JsonObjectWriter);
 };
 
diff --git a/src/google/protobuf/util/internal/json_objectwriter_test.cc b/src/google/protobuf/util/internal/json_objectwriter_test.cc
index bbd9d78a..0dc710c7 100644
--- a/src/google/protobuf/util/internal/json_objectwriter_test.cc
+++ b/src/google/protobuf/util/internal/json_objectwriter_test.cc
@@ -47,7 +47,7 @@ class JsonObjectWriterTest : public ::testing::Test {
   JsonObjectWriterTest()
       : str_stream_(new StringOutputStream(&output_)),
         out_stream_(new CodedOutputStream(str_stream_)),
-        ow_(NULL) {}
+        ow_(nullptr) {}
 
   virtual ~JsonObjectWriterTest() {
     delete ow_;
@@ -95,6 +95,12 @@ TEST_F(JsonObjectWriterTest, EmptyList) {
             output_.substr(0, out_stream_->ByteCount()));
 }
 
+TEST_F(JsonObjectWriterTest, EmptyObjectKey) {
+  ow_ = new JsonObjectWriter("", out_stream_);
+  ow_->StartObject("")->RenderString("", "value")->EndObject();
+  EXPECT_EQ("{\"\":\"value\"}", output_.substr(0, out_stream_->ByteCount()));
+}
+
 TEST_F(JsonObjectWriterTest, ObjectInObject) {
   ow_ = new JsonObjectWriter("", out_stream_);
   ow_->StartObject("")
diff --git a/src/google/protobuf/util/internal/json_stream_parser.cc b/src/google/protobuf/util/internal/json_stream_parser.cc
index b38030c3..1c63b31d 100644
--- a/src/google/protobuf/util/internal/json_stream_parser.cc
+++ b/src/google/protobuf/util/internal/json_stream_parser.cc
@@ -36,9 +36,6 @@
 #include <cstdlib>
 #include <cstring>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
@@ -130,7 +127,7 @@ util::Status JsonStreamParser::Parse(StringPiece json) {
     // Don't point chunk to leftover_ because leftover_ will be updated in
     // ParseChunk(chunk).
     chunk_storage_.swap(leftover_);
-    json.AppendToString(&chunk_storage_);
+    StrAppend(&chunk_storage_, json);
     chunk = StringPiece(chunk_storage_);
   }
 
@@ -141,11 +138,11 @@ util::Status JsonStreamParser::Parse(StringPiece json) {
 
     // Any leftover characters are stashed in leftover_ for later parsing when
     // there is more data available.
-    chunk.substr(n).AppendToString(&leftover_);
+    StrAppend(&leftover_, chunk.substr(n));
     return status;
   } else {
-    chunk.CopyToString(&leftover_);
-    return util::Status::OK;
+    leftover_.assign(chunk.data(), chunk.size());
+    return util::Status();
   }
 }
 
@@ -153,11 +150,11 @@ util::Status JsonStreamParser::FinishParse() {
   // If we do not expect anything and there is nothing left to parse we're all
   // done.
   if (stack_.empty() && leftover_.empty()) {
-    return util::Status::OK;
+    return util::Status();
   }
 
   // Storage for UTF8-coerced string.
-  google::protobuf::scoped_array<char> utf8;
+  std::unique_ptr<char[]> utf8;
   if (coerce_to_utf8_) {
     utf8.reset(new char[leftover_.size()]);
     char* coerced = internal::UTF8CoerceToStructurallyValid(leftover_, utf8.get(), ' ');
@@ -184,7 +181,7 @@ util::Status JsonStreamParser::FinishParse() {
 
 util::Status JsonStreamParser::ParseChunk(StringPiece chunk) {
   // Do not do any work if the chunk is empty.
-  if (chunk.empty()) return util::Status::OK;
+  if (chunk.empty()) return util::Status();
 
   p_ = json_ = chunk;
 
@@ -206,7 +203,7 @@ util::Status JsonStreamParser::ParseChunk(StringPiece chunk) {
     // unparsed data left, we save it for later parse.
     leftover_ = p_.ToString();
   }
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::RunParser() {
@@ -252,15 +249,15 @@ util::Status JsonStreamParser::RunParser() {
         // If we have a key we still need to render, make sure to save off the
         // contents in our own storage.
         if (!key_.empty() && key_storage_.empty()) {
-          key_.AppendToString(&key_storage_);
+          StrAppend(&key_storage_, key_);
           key_ = StringPiece(key_storage_);
         }
-        result = util::Status::OK;
+        result = util::Status();
       }
       return result;
     }
   }
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseValue(TokenType type) {
@@ -386,7 +383,7 @@ util::Status JsonStreamParser::ParseStringHelper() {
       // start fresh.
       string_open_ = 0;
       Advance();
-      return util::Status::OK;
+      return util::Status();
     }
     // Normal character, just advance past it.
     Advance();
@@ -468,7 +465,7 @@ util::Status JsonStreamParser::ParseUnicodeEscape() {
   // Advance past the [final] code unit escape.
   p_.remove_prefix(kUnicodeEscapedLength);
   parsed_storage_.append(buf, len);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseNumber() {
@@ -498,6 +495,19 @@ util::Status JsonStreamParser::ParseNumber() {
   return result;
 }
 
+util::Status JsonStreamParser::ParseDoubleHelper(
+    const string& number, NumberResult* result) {
+  if (!safe_strtod(number, &result->double_val)) {
+    return ReportFailure("Unable to parse number.");
+  }
+  if (!loose_float_number_conversion_ &&
+      !MathLimits<double>::IsFinite(result->double_val)) {
+    return ReportFailure("Number exceeds the range of double.");
+  }
+  result->type = NumberResult::DOUBLE;
+  return util::Status();
+}
+
 util::Status JsonStreamParser::ParseNumberHelper(NumberResult* result) {
   const char* data = p_.data();
   int length = p_.length();
@@ -533,16 +543,11 @@ util::Status JsonStreamParser::ParseNumberHelper(NumberResult* result) {
 
   // Floating point number, parse as a double.
   if (floating) {
-    if (!safe_strtod(number, &result->double_val)) {
-      return ReportFailure("Unable to parse number.");
-    }
-    if (!loose_float_number_conversion_ &&
-        !MathLimits<double>::IsFinite(result->double_val)) {
-      return ReportFailure("Number exceeds the range of double.");
+    util::Status status = ParseDoubleHelper(number, result);
+    if (status.ok()) {
+      p_.remove_prefix(index);
     }
-    result->type = NumberResult::DOUBLE;
-    p_.remove_prefix(index);
-    return util::Status::OK;
+    return status;
   }
 
   // Positive non-floating point number, parse as a uint64.
@@ -551,12 +556,18 @@ util::Status JsonStreamParser::ParseNumberHelper(NumberResult* result) {
     if (number.length() >= 2 && number[0] == '0') {
       return ReportFailure("Octal/hex numbers are not valid JSON values.");
     }
-    if (!safe_strtou64(number, &result->uint_val)) {
-      return ReportFailure("Unable to parse number.");
+    if (safe_strtou64(number, &result->uint_val)) {
+      result->type = NumberResult::UINT;
+      p_.remove_prefix(index);
+      return util::Status();
+    } else {
+      // If the value is too large, parse it as double.
+      util::Status status = ParseDoubleHelper(number, result);
+      if (status.ok()) {
+        p_.remove_prefix(index);
+      }
+      return status;
     }
-    result->type = NumberResult::UINT;
-    p_.remove_prefix(index);
-    return util::Status::OK;
   }
 
   // Octal/Hex numbers are not valid JSON values.
@@ -564,12 +575,18 @@ util::Status JsonStreamParser::ParseNumberHelper(NumberResult* result) {
     return ReportFailure("Octal/hex numbers are not valid JSON values.");
   }
   // Negative non-floating point number, parse as an int64.
-  if (!safe_strto64(number, &result->int_val)) {
-    return ReportFailure("Unable to parse number.");
+  if (safe_strto64(number, &result->int_val)) {
+    result->type = NumberResult::INT;
+    p_.remove_prefix(index);
+    return util::Status();
+  } else {
+    // If the value is too large, parse it as double.
+    util::Status status = ParseDoubleHelper(number, result);
+    if (status.ok()) {
+      p_.remove_prefix(index);
+    }
+    return status;
   }
-  result->type = NumberResult::INT;
-  p_.remove_prefix(index);
-  return util::Status::OK;
 }
 
 util::Status JsonStreamParser::HandleBeginObject() {
@@ -578,7 +595,7 @@ util::Status JsonStreamParser::HandleBeginObject() {
   ow_->StartObject(key_);
   key_ = StringPiece();
   stack_.push(ENTRY);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseObjectMid(TokenType type) {
@@ -590,13 +607,13 @@ util::Status JsonStreamParser::ParseObjectMid(TokenType type) {
   if (type == END_OBJECT) {
     Advance();
     ow_->EndObject();
-    return util::Status::OK;
+    return util::Status();
   }
   // Found a comma, advance past it and get ready for an entry.
   if (type == VALUE_SEPARATOR) {
     Advance();
     stack_.push(ENTRY);
-    return util::Status::OK;
+    return util::Status();
   }
   // Illegal token after key:value pair.
   return ReportFailure("Expected , or } after key:value pair.");
@@ -611,7 +628,7 @@ util::Status JsonStreamParser::ParseEntry(TokenType type) {
   if (type == END_OBJECT) {
     ow_->EndObject();
     Advance();
-    return util::Status::OK;
+    return util::Status();
   }
 
   util::Status result;
@@ -650,7 +667,7 @@ util::Status JsonStreamParser::ParseEntryMid(TokenType type) {
   if (type == ENTRY_SEPARATOR) {
     Advance();
     stack_.push(VALUE);
-    return util::Status::OK;
+    return util::Status();
   }
   return ReportFailure("Expected : between key:value pair.");
 }
@@ -661,7 +678,7 @@ util::Status JsonStreamParser::HandleBeginArray() {
   ow_->StartList(key_);
   key_ = StringPiece();
   stack_.push(ARRAY_VALUE);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseArrayValue(TokenType type) {
@@ -672,7 +689,7 @@ util::Status JsonStreamParser::ParseArrayValue(TokenType type) {
   if (type == END_ARRAY) {
     ow_->EndList();
     Advance();
-    return util::Status::OK;
+    return util::Status();
   }
 
   // The ParseValue call may push something onto the stack so we need to make
@@ -696,14 +713,14 @@ util::Status JsonStreamParser::ParseArrayMid(TokenType type) {
   if (type == END_ARRAY) {
     ow_->EndList();
     Advance();
-    return util::Status::OK;
+    return util::Status();
   }
 
   // Found a comma, advance past it and expect an array value next.
   if (type == VALUE_SEPARATOR) {
     Advance();
     stack_.push(ARRAY_VALUE);
-    return util::Status::OK;
+    return util::Status();
   }
   // Illegal token after array value.
   return ReportFailure("Expected , or ] after array value.");
@@ -713,27 +730,27 @@ util::Status JsonStreamParser::ParseTrue() {
   ow_->RenderBool(key_, true);
   key_ = StringPiece();
   p_.remove_prefix(true_len);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseFalse() {
   ow_->RenderBool(key_, false);
   key_ = StringPiece();
   p_.remove_prefix(false_len);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseNull() {
   ow_->RenderNull(key_);
   key_ = StringPiece();
   p_.remove_prefix(null_len);
-  return util::Status::OK;
+  return util::Status();
 }
 
 util::Status JsonStreamParser::ParseEmptyNull() {
   ow_->RenderNull(key_);
   key_ = StringPiece();
-  return util::Status::OK;
+  return util::Status();
 }
 
 bool JsonStreamParser::IsEmptyNullAllowed(TokenType type) {
@@ -793,7 +810,7 @@ util::Status JsonStreamParser::ParseKey() {
   }
   // Since we aren't using the key storage, clear it out.
   key_storage_.clear();
-  return util::Status::OK;
+  return util::Status();
 }
 
 JsonStreamParser::TokenType JsonStreamParser::GetNextTokenType() {
diff --git a/src/google/protobuf/util/internal/json_stream_parser.h b/src/google/protobuf/util/internal/json_stream_parser.h
index 6b9d46ee..31933b67 100644
--- a/src/google/protobuf/util/internal/json_stream_parser.h
+++ b/src/google/protobuf/util/internal/json_stream_parser.h
@@ -154,6 +154,9 @@ class LIBPROTOBUF_EXPORT JsonStreamParser {
   // component.
   util::Status ParseNumberHelper(NumberResult* result);
 
+  // Parse a number as double into a NumberResult.
+  util::Status ParseDoubleHelper(const string& number, NumberResult* result);
+
   // Handles a { during parsing of a value.
   util::Status HandleBeginObject();
 
diff --git a/src/google/protobuf/util/internal/json_stream_parser_test.cc b/src/google/protobuf/util/internal/json_stream_parser_test.cc
index ca71ff24..a11e9be0 100644
--- a/src/google/protobuf/util/internal/json_stream_parser_test.cc
+++ b/src/google/protobuf/util/internal/json_stream_parser_test.cc
@@ -694,20 +694,19 @@ TEST_F(JsonStreamParserTest, ExtraCharactersAfterObject) {
   }
 }
 
-// numbers too large
-TEST_F(JsonStreamParserTest, PositiveNumberTooBig) {
-  StringPiece str = "[18446744073709551616]";  // 2^64
+TEST_F(JsonStreamParserTest, PositiveNumberTooBigIsDouble) {
+  StringPiece str = "18446744073709551616";  // 2^64
   for (int i = 0; i <= str.length(); ++i) {
-    ow_.StartList("");
-    DoErrorTest(str, i, "Unable to parse number.");
+    ow_.RenderDouble("", 18446744073709552000.0);
+    DoTest(str, i);
   }
 }
 
-TEST_F(JsonStreamParserTest, NegativeNumberTooBig) {
-  StringPiece str = "[-18446744073709551616]";
+TEST_F(JsonStreamParserTest, NegativeNumberTooBigIsDouble) {
+  StringPiece str = "-18446744073709551616";
   for (int i = 0; i <= str.length(); ++i) {
-    ow_.StartList("");
-    DoErrorTest(str, i, "Unable to parse number.");
+    ow_.RenderDouble("", -18446744073709551616.0);
+    DoTest(str, i);
   }
 }
 
diff --git a/src/google/protobuf/util/internal/object_writer.h b/src/google/protobuf/util/internal/object_writer.h
index b6fbd19b..5781aa1e 100644
--- a/src/google/protobuf/util/internal/object_writer.h
+++ b/src/google/protobuf/util/internal/object_writer.h
@@ -119,13 +119,6 @@ class LIBPROTOBUF_EXPORT ObjectWriter {
     return use_strict_base64_decoding_;
   }
 
-  // Whether empty strings should be rendered for the next name for Start/Render
-  // calls. This setting is only valid until the next key is rendered, after
-  // which it gets reset.
-  // It is up to the derived classes to interpret this and render accordingly.
-  // Default implementation ignores this setting.
-  virtual void empty_name_ok_for_next_key() {}
-
  protected:
   ObjectWriter() : use_strict_base64_decoding_(true) {}
 
diff --git a/src/google/protobuf/util/internal/proto_writer.cc b/src/google/protobuf/util/internal/proto_writer.cc
index 8bebf2ab..b7a52db6 100644
--- a/src/google/protobuf/util/internal/proto_writer.cc
+++ b/src/google/protobuf/util/internal/proto_writer.cc
@@ -66,7 +66,7 @@ ProtoWriter::ProtoWriter(TypeResolver* type_resolver,
       done_(false),
       ignore_unknown_fields_(false),
       use_lower_camel_for_enums_(false),
-      element_(NULL),
+      element_(nullptr),
       size_insert_(),
       output_(output),
       buffer_(),
@@ -85,7 +85,7 @@ ProtoWriter::ProtoWriter(const TypeInfo* typeinfo,
       done_(false),
       ignore_unknown_fields_(false),
       use_lower_camel_for_enums_(false),
-      element_(NULL),
+      element_(nullptr),
       size_insert_(),
       output_(output),
       buffer_(),
@@ -99,14 +99,14 @@ ProtoWriter::~ProtoWriter() {
   if (own_typeinfo_) {
     delete typeinfo_;
   }
-  if (element_ == NULL) return;
+  if (element_ == nullptr) return;
   // Cleanup explicitly in order to avoid destructor stack overflow when input
   // is deeply nested.
   // Cast to BaseElement to avoid doing additional checks (like missing fields)
   // during pop().
-  google::protobuf::scoped_ptr<BaseElement> element(
+  std::unique_ptr<BaseElement> element(
       static_cast<BaseElement*>(element_.get())->pop<BaseElement>());
-  while (element != NULL) {
+  while (element != nullptr) {
     element.reset(element->pop<BaseElement>());
   }
 }
@@ -267,8 +267,9 @@ inline Status WriteString(int field_number, const DataPiece& data,
 inline Status WriteEnum(int field_number, const DataPiece& data,
                         const google::protobuf::Enum* enum_type,
                         CodedOutputStream* stream,
-                        bool use_lower_camel_for_enums) {
-  StatusOr<int> e = data.ToEnum(enum_type, use_lower_camel_for_enums);
+                        bool use_lower_camel_for_enums,
+                        bool ignore_unknown_values) {
+  StatusOr<int> e = data.ToEnum(enum_type, use_lower_camel_for_enums, ignore_unknown_values);
   if (e.ok()) {
     WireFormatLite::WriteEnum(field_number, e.ValueOrDie(), stream);
   }
@@ -294,9 +295,9 @@ std::set<const google::protobuf::Field*> GetRequiredFields(
 ProtoWriter::ProtoElement::ProtoElement(const TypeInfo* typeinfo,
                                         const google::protobuf::Type& type,
                                         ProtoWriter* enclosing)
-    : BaseElement(NULL),
+    : BaseElement(nullptr),
       ow_(enclosing),
-      parent_field_(NULL),
+      parent_field_(nullptr),
       typeinfo_(typeinfo),
       proto3_(type.syntax() == google::protobuf::SYNTAX_PROTO3),
       type_(type),
@@ -374,7 +375,7 @@ ProtoWriter::ProtoElement* ProtoWriter::ProtoElement::pop() {
     // all enclosing messages.
     int size = ow_->size_insert_[size_index_].size;
     int length = CodedOutputStream::VarintSize32(size);
-    for (ProtoElement* e = parent(); e != NULL; e = e->parent()) {
+    for (ProtoElement* e = parent(); e != nullptr; e = e->parent()) {
       // Only nested messages have size field, lists do not have size field.
       if (e->size_index_ >= 0) {
         ow_->size_insert_[e->size_index_].size += length;
@@ -394,7 +395,7 @@ void ProtoWriter::ProtoElement::RegisterField(
 }
 
 string ProtoWriter::ProtoElement::ToString() const {
-  if (parent() == NULL) return "";
+  if (parent() == nullptr) return "";
   string loc = parent()->ToString();
   if (!ow_->IsRepeated(*parent_field_) ||
       parent()->parent_field_ != parent_field_) {
@@ -439,7 +440,7 @@ void ProtoWriter::MissingField(StringPiece missing_name) {
 
 ProtoWriter* ProtoWriter::StartObject(StringPiece name) {
   // Starting the root message. Create the root ProtoElement and return.
-  if (element_ == NULL) {
+  if (element_ == nullptr) {
     if (!name.empty()) {
       InvalidName(name, "Root element should not be named.");
     }
@@ -447,9 +448,9 @@ ProtoWriter* ProtoWriter::StartObject(StringPiece name) {
     return this;
   }
 
-  const google::protobuf::Field* field = NULL;
+  const google::protobuf::Field* field = nullptr;
   field = BeginNamed(name, false);
-  if (field == NULL) return this;
+  if (field == nullptr) return this;
 
   // Check to see if this field is a oneof and that no oneof in that group has
   // already been set.
@@ -459,7 +460,7 @@ ProtoWriter* ProtoWriter::StartObject(StringPiece name) {
   }
 
   const google::protobuf::Type* type = LookupType(field);
-  if (type == NULL) {
+  if (type == nullptr) {
     ++invalid_depth_;
     InvalidName(name,
                 StrCat("Missing descriptor for field: ", field->type_url()));
@@ -475,14 +476,14 @@ ProtoWriter* ProtoWriter::EndObject() {
     return this;
   }
 
-  if (element_ != NULL) {
+  if (element_ != nullptr) {
     element_.reset(element_->pop());
   }
 
 
   // If ending the root element,
   // then serialize the full message with calculated sizes.
-  if (element_ == NULL) {
+  if (element_ == nullptr) {
     WriteRootMessage();
   }
   return this;
@@ -490,7 +491,7 @@ ProtoWriter* ProtoWriter::EndObject() {
 
 ProtoWriter* ProtoWriter::StartList(StringPiece name) {
   const google::protobuf::Field* field = BeginNamed(name, true);
-  if (field == NULL) return this;
+  if (field == nullptr) return this;
 
   if (!ValidOneof(*field, name)) {
     ++invalid_depth_;
@@ -498,7 +499,7 @@ ProtoWriter* ProtoWriter::StartList(StringPiece name) {
   }
 
   const google::protobuf::Type* type = LookupType(field);
-  if (type == NULL) {
+  if (type == nullptr) {
     ++invalid_depth_;
     InvalidName(name,
                 StrCat("Missing descriptor for field: ", field->type_url()));
@@ -511,7 +512,7 @@ ProtoWriter* ProtoWriter::StartList(StringPiece name) {
 ProtoWriter* ProtoWriter::EndList() {
   if (invalid_depth_ > 0) {
     --invalid_depth_;
-  } else if (element_ != NULL) {
+  } else if (element_ != nullptr) {
     element_.reset(element_->pop());
   }
   return this;
@@ -523,12 +524,12 @@ ProtoWriter* ProtoWriter::RenderDataPiece(StringPiece name,
   if (invalid_depth_ > 0) return this;
 
   const google::protobuf::Field* field = Lookup(name);
-  if (field == NULL) return this;
+  if (field == nullptr) return this;
 
   if (!ValidOneof(*field, name)) return this;
 
   const google::protobuf::Type* type = LookupType(field);
-  if (type == NULL) {
+  if (type == nullptr) {
     InvalidName(name,
                 StrCat("Missing descriptor for field: ", field->type_url()));
     return this;
@@ -539,7 +540,7 @@ ProtoWriter* ProtoWriter::RenderDataPiece(StringPiece name,
 
 bool ProtoWriter::ValidOneof(const google::protobuf::Field& field,
                              StringPiece unnormalized_name) {
-  if (element_ == NULL) return true;
+  if (element_ == nullptr) return true;
 
   if (field.oneof_index() > 0) {
     if (element_->IsOneofIndexTaken(field.oneof_index())) {
@@ -665,7 +666,8 @@ ProtoWriter* ProtoWriter::RenderPrimitiveField(
     case google::protobuf::Field_Kind_TYPE_ENUM: {
       status = WriteEnum(field.number(), data,
                          typeinfo_->GetEnumByTypeUrl(field.type_url()),
-                         stream_.get(), use_lower_camel_for_enums_);
+                         stream_.get(), use_lower_camel_for_enums_,
+                         ignore_unknown_fields_);
       break;
     }
     default:  // TYPE_GROUP or TYPE_MESSAGE
@@ -692,18 +694,18 @@ const google::protobuf::Field* ProtoWriter::BeginNamed(StringPiece name,
                                                        bool is_list) {
   if (invalid_depth_ > 0) {
     ++invalid_depth_;
-    return NULL;
+    return nullptr;
   }
   const google::protobuf::Field* field = Lookup(name);
-  if (field == NULL) {
+  if (field == nullptr) {
     ++invalid_depth_;
     // InvalidName() already called in Lookup().
-    return NULL;
+    return nullptr;
   }
   if (is_list && !IsRepeated(*field)) {
     ++invalid_depth_;
     InvalidName(name, "Proto field is not repeating, cannot start list.");
-    return NULL;
+    return nullptr;
   }
   return field;
 }
@@ -711,23 +713,23 @@ const google::protobuf::Field* ProtoWriter::BeginNamed(StringPiece name,
 const google::protobuf::Field* ProtoWriter::Lookup(
     StringPiece unnormalized_name) {
   ProtoElement* e = element();
-  if (e == NULL) {
+  if (e == nullptr) {
     InvalidName(unnormalized_name, "Root element must be a message.");
-    return NULL;
+    return nullptr;
   }
   if (unnormalized_name.empty()) {
     // Objects in repeated field inherit the same field descriptor.
-    if (e->parent_field() == NULL) {
+    if (e->parent_field() == nullptr) {
       InvalidName(unnormalized_name, "Proto fields must have a name.");
     } else if (!IsRepeated(*e->parent_field())) {
       InvalidName(unnormalized_name, "Proto fields must have a name.");
-      return NULL;
+      return nullptr;
     }
     return e->parent_field();
   }
   const google::protobuf::Field* field =
       typeinfo_->FindField(&e->type(), unnormalized_name);
-  if (field == NULL && !ignore_unknown_fields_) {
+  if (field == nullptr && !ignore_unknown_fields_) {
     InvalidName(unnormalized_name, "Cannot find field.");
   }
   return field;
@@ -746,7 +748,7 @@ void ProtoWriter::WriteRootMessage() {
   int curr_pos = 0;
   // Calls the destructor of CodedOutputStream to remove any uninitialized
   // memory from the Cord before we read it.
-  stream_.reset(NULL);
+  stream_.reset(nullptr);
   const void* data;
   int length;
   google::protobuf::io::ArrayInputStream input_stream(buffer_.data(), buffer_.size());
diff --git a/src/google/protobuf/util/internal/proto_writer.h b/src/google/protobuf/util/internal/proto_writer.h
index 21dff88d..28496963 100644
--- a/src/google/protobuf/util/internal/proto_writer.h
+++ b/src/google/protobuf/util/internal/proto_writer.h
@@ -81,32 +81,32 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   virtual ~ProtoWriter();
 
   // ObjectWriter methods.
-  virtual ProtoWriter* StartObject(StringPiece name);
-  virtual ProtoWriter* EndObject();
-  virtual ProtoWriter* StartList(StringPiece name);
-  virtual ProtoWriter* EndList();
-  virtual ProtoWriter* RenderBool(StringPiece name, bool value) {
+  ProtoWriter* StartObject(StringPiece name) override;
+  ProtoWriter* EndObject() override;
+  ProtoWriter* StartList(StringPiece name) override;
+  ProtoWriter* EndList() override;
+  ProtoWriter* RenderBool(StringPiece name, bool value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderInt32(StringPiece name, int32 value) {
+  ProtoWriter* RenderInt32(StringPiece name, int32 value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderUint32(StringPiece name, uint32 value) {
+  ProtoWriter* RenderUint32(StringPiece name, uint32 value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderInt64(StringPiece name, int64 value) {
+  ProtoWriter* RenderInt64(StringPiece name, int64 value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderUint64(StringPiece name, uint64 value) {
+  ProtoWriter* RenderUint64(StringPiece name, uint64 value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderDouble(StringPiece name, double value) {
+  ProtoWriter* RenderDouble(StringPiece name, double value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderFloat(StringPiece name, float value) {
+  ProtoWriter* RenderFloat(StringPiece name, float value) override {
     return RenderDataPiece(name, DataPiece(value));
   }
-  virtual ProtoWriter* RenderString(StringPiece name, StringPiece value) {
+  ProtoWriter* RenderString(StringPiece name, StringPiece value) override {
     return RenderDataPiece(name,
                            DataPiece(value, use_strict_base64_decoding()));
   }
@@ -114,7 +114,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
     return RenderDataPiece(
         name, DataPiece(value, false, use_strict_base64_decoding()));
   }
-  virtual ProtoWriter* RenderNull(StringPiece name) {
+  ProtoWriter* RenderNull(StringPiece name) override {
     return RenderDataPiece(name, DataPiece::NullData());
   }
 
@@ -126,11 +126,11 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
 
   // Returns the location tracker to use for tracking locations for errors.
   const LocationTrackerInterface& location() {
-    return element_ != NULL ? *element_ : *tracker_;
+    return element_ != nullptr ? *element_ : *tracker_;
   }
 
   // When true, we finished writing to output a complete message.
-  bool done() { return done_; }
+  bool done() override { return done_; }
 
   // Returns the proto stream object.
   google::protobuf::io::CodedOutputStream* stream() { return stream_.get(); }
@@ -173,7 +173,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
     ProtoElement* pop();
 
     // Accessors
-    // parent_field() may be NULL if we are at root.
+    // parent_field() may be nullptr if we are at root.
     const google::protobuf::Field* parent_field() const {
       return parent_field_;
     }
@@ -204,7 +204,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
     ProtoWriter* ow_;
 
     // Describes the element as a field in the parent message.
-    // parent_field_ is NULL if and only if this element is the root element.
+    // parent_field_ is nullptr if and only if this element is the root element.
     const google::protobuf::Field* parent_field_;
 
     // TypeInfo to lookup types.
@@ -242,7 +242,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   ProtoWriter(const TypeInfo* typeinfo, const google::protobuf::Type& type,
               strings::ByteSink* output, ErrorListener* listener);
 
-  virtual ProtoElement* element() { return element_.get(); }
+  ProtoElement* element() override { return element_.get(); }
 
   // Helper methods for calling ErrorListener. See error_listener.h.
   void InvalidName(StringPiece unknown_name, StringPiece message);
@@ -259,7 +259,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   // extensions are found.
   const google::protobuf::Field* Lookup(StringPiece name);
 
-  // Lookup the field type in the type descriptor. Returns NULL if the type
+  // Lookup the field type in the type descriptor. Returns nullptr if the type
   // is not known.
   const google::protobuf::Type* LookupType(
       const google::protobuf::Field* field);
@@ -309,7 +309,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   // Indicates whether we finished writing root message completely.
   bool done_;
 
-  // If true, don't report unknown field names to the listener.
+  // If true, don't report unknown field names and enum values to the listener.
   bool ignore_unknown_fields_;
 
   // If true, check if enum name in camel case or without underscore matches the
@@ -321,7 +321,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   // size_insert_: sizes of nested messages.
   //               pos  - position to insert the size field.
   //               size - size value to be inserted.
-  google::protobuf::scoped_ptr<ProtoElement> element_;
+  std::unique_ptr<ProtoElement> element_;
   std::deque<SizeInfo> size_insert_;
 
   // Variables for output generation:
@@ -332,7 +332,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   strings::ByteSink* output_;
   string buffer_;
   google::protobuf::io::StringOutputStream adapter_;
-  google::protobuf::scoped_ptr<google::protobuf::io::CodedOutputStream> stream_;
+  std::unique_ptr<google::protobuf::io::CodedOutputStream> stream_;
 
   // Variables for error tracking and reporting:
   // listener_     : a place to report any errors found.
@@ -340,7 +340,7 @@ class LIBPROTOBUF_EXPORT ProtoWriter : public StructuredObjectWriter {
   // tracker_      : the root location tracker interface.
   ErrorListener* listener_;
   int invalid_depth_;
-  google::protobuf::scoped_ptr<LocationTrackerInterface> tracker_;
+  std::unique_ptr<LocationTrackerInterface> tracker_;
 
   GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(ProtoWriter);
 };
diff --git a/src/google/protobuf/util/internal/protostream_objectsource.cc b/src/google/protobuf/util/internal/protostream_objectsource.cc
index f9fd7b01..56e6db12 100644
--- a/src/google/protobuf/util/internal/protostream_objectsource.cc
+++ b/src/google/protobuf/util/internal/protostream_objectsource.cc
@@ -73,14 +73,14 @@ namespace {
 
 static int kDefaultMaxRecursionDepth = 64;
 
-// Finds a field with the given number. NULL if none found.
+// Finds a field with the given number. nullptr if none found.
 const google::protobuf::Field* FindFieldByNumber(
     const google::protobuf::Type& type, int number);
 
 // Returns true if the field is packable.
 bool IsPackable(const google::protobuf::Field& field);
 
-// Finds an enum value with the given number. NULL if none found.
+// Finds an enum value with the given number. nullptr if none found.
 const google::protobuf::EnumValue* FindEnumValueByNumber(
     const google::protobuf::Enum& tech_enum, int number);
 
@@ -121,11 +121,13 @@ ProtoStreamObjectSource::ProtoStreamObjectSource(
       type_(type),
       use_lower_camel_for_enums_(false),
       use_ints_for_enums_(false),
+      preserve_proto_field_names_(false),
       recursion_depth_(0),
       max_recursion_depth_(kDefaultMaxRecursionDepth),
       render_unknown_fields_(false),
+      render_unknown_enum_values_(true),
       add_trailing_zeros_for_timestamp_and_duration_(false) {
-  GOOGLE_LOG_IF(DFATAL, stream == NULL) << "Input stream is NULL.";
+  GOOGLE_LOG_IF(DFATAL, stream == nullptr) << "Input stream is nullptr.";
 }
 
 ProtoStreamObjectSource::ProtoStreamObjectSource(
@@ -137,11 +139,13 @@ ProtoStreamObjectSource::ProtoStreamObjectSource(
       type_(type),
       use_lower_camel_for_enums_(false),
       use_ints_for_enums_(false),
+      preserve_proto_field_names_(false),
       recursion_depth_(0),
       max_recursion_depth_(kDefaultMaxRecursionDepth),
       render_unknown_fields_(false),
+      render_unknown_enum_values_(true),
       add_trailing_zeros_for_timestamp_and_duration_(false) {
-  GOOGLE_LOG_IF(DFATAL, stream == NULL) << "Input stream is NULL.";
+  GOOGLE_LOG_IF(DFATAL, stream == nullptr) << "Input stream is nullptr.";
 }
 
 ProtoStreamObjectSource::~ProtoStreamObjectSource() {
@@ -161,7 +165,7 @@ const google::protobuf::Field* ProtoStreamObjectSource::FindAndVerifyField(
   const google::protobuf::Field* field = FindFieldByNumber(type, tag >> 3);
   // Verify if the field corresponds to the wire type in tag.
   // If there is any discrepancy, mark the field as not found.
-  if (field != NULL) {
+  if (field != nullptr) {
     WireFormatLite::WireType expected_type =
         WireFormatLite::WireTypeForFieldType(
             static_cast<WireFormatLite::FieldType>(field->kind()));
@@ -169,7 +173,7 @@ const google::protobuf::Field* ProtoStreamObjectSource::FindAndVerifyField(
     if (actual_type != expected_type &&
         (!IsPackable(*field) ||
          actual_type != WireFormatLite::WIRETYPE_LENGTH_DELIMITED)) {
-      field = NULL;
+      field = nullptr;
     }
   }
   return field;
@@ -182,11 +186,11 @@ Status ProtoStreamObjectSource::WriteMessage(const google::protobuf::Type& type,
                                              ObjectWriter* ow) const {
 
     const TypeRenderer* type_renderer = FindTypeRenderer(type.name());
-    if (type_renderer != NULL) {
+    if (type_renderer != nullptr) {
       return (*type_renderer)(this, type, name, ow);
     }
 
-  const google::protobuf::Field* field = NULL;
+  const google::protobuf::Field* field = nullptr;
   string field_name;
   // last_tag set to dummy value that is different from tag.
   uint32 tag = stream_->ReadTag(), last_tag = tag + 1;
@@ -199,15 +203,19 @@ Status ProtoStreamObjectSource::WriteMessage(const google::protobuf::Type& type,
     if (tag != last_tag) {  // Update field only if tag is changed.
       last_tag = tag;
       field = FindAndVerifyField(type, tag);
-      if (field != NULL) {
-        field_name = field->json_name();
+      if (field != nullptr) {
+        if (preserve_proto_field_names_) {
+          field_name = field->name();
+        } else {
+          field_name = field->json_name();
+        }
       }
     }
-    if (field == NULL) {
+    if (field == nullptr) {
       // If we didn't find a field, skip this unknown tag.
       // TODO(wpoon): Check return boolean value.
       WireFormat::SkipField(stream_, tag,
-                            render_unknown_fields_ ? &unknown_fields : NULL);
+                            render_unknown_fields_ ? &unknown_fields : nullptr);
       tag = stream_->ReadTag();
       continue;
     }
@@ -234,7 +242,7 @@ Status ProtoStreamObjectSource::WriteMessage(const google::protobuf::Type& type,
   if (include_start_and_end) {
     ow->EndObject();
   }
-  return Status::OK;
+  return util::Status();
 }
 
 StatusOr<uint32> ProtoStreamObjectSource::RenderList(
@@ -274,8 +282,8 @@ StatusOr<uint32> ProtoStreamObjectSource::RenderMap(
     for (uint32 tag = stream_->ReadTag(); tag != 0; tag = stream_->ReadTag()) {
       const google::protobuf::Field* field =
           FindAndVerifyField(*field_type, tag);
-      if (field == NULL) {
-        WireFormat::SkipField(stream_, tag, NULL);
+      if (field == nullptr) {
+        WireFormat::SkipField(stream_, tag, nullptr);
         continue;
       }
       // Map field numbers are key = 1 and value = 2
@@ -286,14 +294,12 @@ StatusOr<uint32> ProtoStreamObjectSource::RenderMap(
           // An absent map key is treated as the default.
           const google::protobuf::Field* key_field =
               FindFieldByNumber(*field_type, 1);
-          if (key_field == NULL) {
+          if (key_field == nullptr) {
             // The Type info for this map entry is incorrect. It should always
             // have a field named "key" and with field number 1.
             return Status(util::error::INTERNAL, "Invalid map entry.");
           }
           ASSIGN_OR_RETURN(map_key, MapKeyDefaultValueAsString(*key_field));
-          // Key is empty, force it to render as empty (for string values).
-          ow->empty_name_ok_for_next_key();
         }
         RETURN_IF_ERROR(RenderField(field, map_key, ow));
       } else {
@@ -316,7 +322,7 @@ Status ProtoStreamObjectSource::RenderPacked(
     RETURN_IF_ERROR(RenderField(field, StringPiece(), ow));
   }
   stream_->PopLimit(old_limit);
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderTimestamp(
@@ -340,7 +346,7 @@ Status ProtoStreamObjectSource::RenderTimestamp(
   ow->RenderString(field_name,
                    ::google::protobuf::internal::FormatTime(seconds, nanos));
 
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderDuration(
@@ -381,7 +387,7 @@ Status ProtoStreamObjectSource::RenderDuration(
       FormatNanos(nanos, os->add_trailing_zeros_for_timestamp_and_duration_)
           .c_str());
   ow->RenderString(field_name, formatted_duration);
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderDouble(const ProtoStreamObjectSource* os,
@@ -395,7 +401,7 @@ Status ProtoStreamObjectSource::RenderDouble(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderDouble(field_name, bit_cast<double>(buffer64));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderFloat(const ProtoStreamObjectSource* os,
@@ -409,7 +415,7 @@ Status ProtoStreamObjectSource::RenderFloat(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderFloat(field_name, bit_cast<float>(buffer32));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderInt64(const ProtoStreamObjectSource* os,
@@ -423,7 +429,7 @@ Status ProtoStreamObjectSource::RenderInt64(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderInt64(field_name, bit_cast<int64>(buffer64));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderUInt64(const ProtoStreamObjectSource* os,
@@ -437,7 +443,7 @@ Status ProtoStreamObjectSource::RenderUInt64(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderUint64(field_name, bit_cast<uint64>(buffer64));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderInt32(const ProtoStreamObjectSource* os,
@@ -451,7 +457,7 @@ Status ProtoStreamObjectSource::RenderInt32(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderInt32(field_name, bit_cast<int32>(buffer32));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderUInt32(const ProtoStreamObjectSource* os,
@@ -465,7 +471,7 @@ Status ProtoStreamObjectSource::RenderUInt32(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderUint32(field_name, bit_cast<uint32>(buffer32));
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderBool(const ProtoStreamObjectSource* os,
@@ -480,7 +486,7 @@ Status ProtoStreamObjectSource::RenderBool(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderBool(field_name, buffer64 != 0);
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderString(const ProtoStreamObjectSource* os,
@@ -496,7 +502,7 @@ Status ProtoStreamObjectSource::RenderString(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderString(field_name, str);
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderBytes(const ProtoStreamObjectSource* os,
@@ -512,14 +518,14 @@ Status ProtoStreamObjectSource::RenderBytes(const ProtoStreamObjectSource* os,
     os->stream_->ReadTag();
   }
   ow->RenderBytes(field_name, str);
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderStruct(const ProtoStreamObjectSource* os,
                                              const google::protobuf::Type& type,
                                              StringPiece field_name,
                                              ObjectWriter* ow) {
-  const google::protobuf::Field* field = NULL;
+  const google::protobuf::Field* field = nullptr;
   uint32 tag = os->stream_->ReadTag();
   ow->StartObject(field_name);
   while (tag != 0) {
@@ -531,23 +537,23 @@ Status ProtoStreamObjectSource::RenderStruct(const ProtoStreamObjectSource* os,
     }
   }
   ow->EndObject();
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderStructValue(
     const ProtoStreamObjectSource* os, const google::protobuf::Type& type,
     StringPiece field_name, ObjectWriter* ow) {
-  const google::protobuf::Field* field = NULL;
+  const google::protobuf::Field* field = nullptr;
   for (uint32 tag = os->stream_->ReadTag(); tag != 0;
        tag = os->stream_->ReadTag()) {
     field = os->FindAndVerifyField(type, tag);
-    if (field == NULL) {
-      WireFormat::SkipField(os->stream_, tag, NULL);
+    if (field == nullptr) {
+      WireFormat::SkipField(os->stream_, tag, nullptr);
       continue;
     }
     RETURN_IF_ERROR(os->RenderField(field, field_name, ow));
   }
-  return Status::OK;
+  return util::Status();
 }
 
 // TODO(skarvaje): Avoid code duplication of for loops and SkipField logic.
@@ -560,19 +566,19 @@ Status ProtoStreamObjectSource::RenderStructListValue(
   if (tag == 0) {
     ow->StartList(field_name);
     ow->EndList();
-    return Status::OK;
+    return util::Status();
   }
 
   while (tag != 0) {
     const google::protobuf::Field* field = os->FindAndVerifyField(type, tag);
-    if (field == NULL) {
-      WireFormat::SkipField(os->stream_, tag, NULL);
+    if (field == nullptr) {
+      WireFormat::SkipField(os->stream_, tag, nullptr);
       tag = os->stream_->ReadTag();
       continue;
     }
     ASSIGN_OR_RETURN(tag, os->RenderList(field, field_name, tag, ow));
   }
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderAny(const ProtoStreamObjectSource* os,
@@ -587,8 +593,8 @@ Status ProtoStreamObjectSource::RenderAny(const ProtoStreamObjectSource* os,
   // First read out the type_url and value from the proto stream
   for (tag = os->stream_->ReadTag(); tag != 0; tag = os->stream_->ReadTag()) {
     const google::protobuf::Field* field = os->FindAndVerifyField(type, tag);
-    if (field == NULL) {
-      WireFormat::SkipField(os->stream_, tag, NULL);
+    if (field == nullptr) {
+      WireFormat::SkipField(os->stream_, tag, nullptr);
       continue;
     }
     // 'type_url' has field number of 1 and 'value' has field number 2
@@ -614,7 +620,7 @@ Status ProtoStreamObjectSource::RenderAny(const ProtoStreamObjectSource* os,
       ow->RenderString("@type", type_url);
     }
     ow->EndObject();
-    return util::Status::OK;
+    return util::Status();
   }
 
   // If there is a value but no type, we cannot render it, so report an error.
@@ -661,7 +667,7 @@ Status ProtoStreamObjectSource::RenderFieldMask(
        tag = os->stream_->ReadTag()) {
     if (paths_field_tag == 0) {
       const google::protobuf::Field* field = os->FindAndVerifyField(type, tag);
-      if (field != NULL && field->number() == 1 &&
+      if (field != nullptr && field->number() == 1 &&
           field->name() == "paths") {
         paths_field_tag = tag;
       }
@@ -679,7 +685,7 @@ Status ProtoStreamObjectSource::RenderFieldMask(
     combined.append(ConvertFieldMaskPath(str, &ToCamelCase));
   }
   ow->RenderString(field_name, combined);
-  return Status::OK;
+  return util::Status();
 }
 
 
@@ -748,7 +754,7 @@ Status ProtoStreamObjectSource::RenderField(
     // Get the nested message type for this field.
     const google::protobuf::Type* type =
         typeinfo_->GetTypeByTypeUrl(field->type_url());
-    if (type == NULL) {
+    if (type == nullptr) {
       return Status(util::error::INTERNAL,
                     StrCat("Invalid configuration. Could not find the type: ",
                            field->type_url()));
@@ -757,7 +763,7 @@ Status ProtoStreamObjectSource::RenderField(
     // Short-circuit any special type rendering to save call-stack space.
     const TypeRenderer* type_renderer = FindTypeRenderer(type->name());
 
-    bool use_type_renderer = type_renderer != NULL;
+    bool use_type_renderer = type_renderer != nullptr;
 
     if (use_type_renderer) {
       RETURN_IF_ERROR((*type_renderer)(this, *type, field_name, ow));
@@ -775,7 +781,7 @@ Status ProtoStreamObjectSource::RenderField(
     // Render all other non-message types.
     return RenderNonMessageField(field, field_name, ow);
   }
-  return Status::OK;
+  return util::Status();
 }
 
 Status ProtoStreamObjectSource::RenderNonMessageField(
@@ -860,12 +866,6 @@ Status ProtoStreamObjectSource::RenderNonMessageField(
         break;
       }
 
-      // No need to lookup enum type if we need to render int.
-      if (use_ints_for_enums_) {
-        ow->RenderInt32(field_name, buffer32);
-        break;
-      }
-
       // Get the nested enum type for this field.
       // TODO(skarvaje): Avoid string manipulation. Find ways to speed this
       // up.
@@ -873,18 +873,22 @@ Status ProtoStreamObjectSource::RenderNonMessageField(
           typeinfo_->GetEnumByTypeUrl(field->type_url());
       // Lookup the name of the enum, and render that. Unknown enum values
       // are printed as integers.
-      if (en != NULL) {
+      if (en != nullptr) {
         const google::protobuf::EnumValue* enum_value =
             FindEnumValueByNumber(*en, buffer32);
-        if (enum_value != NULL) {
-          if (use_lower_camel_for_enums_)
-            ow->RenderString(field_name, ToCamelCase(enum_value->name()));
-          else
+        if (enum_value != nullptr) {
+          if (use_ints_for_enums_) {
+            ow->RenderInt32(field_name, buffer32);
+          } else if (use_lower_camel_for_enums_) {
+            ow->RenderString(field_name,
+                             EnumValueNameToLowerCamelCase(enum_value->name()));
+          } else {
             ow->RenderString(field_name, enum_value->name());
-        } else {
+          }
+        } else if (render_unknown_enum_values_) {
           ow->RenderInt32(field_name, buffer32);
         }
-      } else {
+      } else if (render_unknown_enum_values_) {
         ow->RenderInt32(field_name, buffer32);
       }
       break;
@@ -904,7 +908,7 @@ Status ProtoStreamObjectSource::RenderNonMessageField(
     default:
       break;
   }
-  return Status::OK;
+  return util::Status();
 }
 
 // TODO(skarvaje): Fix this to avoid code duplication.
@@ -999,10 +1003,10 @@ const string ProtoStreamObjectSource::ReadFieldValueAsString(
       const google::protobuf::Enum* en =
           typeinfo_->GetEnumByTypeUrl(field.type_url());
       // Lookup the name of the enum, and render that. Skips unknown enums.
-      if (en != NULL) {
+      if (en != nullptr) {
         const google::protobuf::EnumValue* enum_value =
             FindEnumValueByNumber(*en, buffer32);
-        if (enum_value != NULL) {
+        if (enum_value != nullptr) {
           result = enum_value->name();
         }
       }
@@ -1046,8 +1050,8 @@ std::pair<int64, int32> ProtoStreamObjectSource::ReadSecondsAndNanos(
 
   for (tag = stream_->ReadTag(); tag != 0; tag = stream_->ReadTag()) {
     const google::protobuf::Field* field = FindAndVerifyField(type, tag);
-    if (field == NULL) {
-      WireFormat::SkipField(stream_, tag, NULL);
+    if (field == nullptr) {
+      WireFormat::SkipField(stream_, tag, nullptr);
       continue;
     }
     // 'seconds' has field number of 1 and 'nanos' has field number 2
@@ -1073,7 +1077,7 @@ Status ProtoStreamObjectSource::IncrementRecursionDepth(
         StrCat("Message too deep. Max recursion depth reached for type '",
                type_name, "', field '", field_name, "'"));
   }
-  return Status::OK;
+  return util::Status();
 }
 
 namespace {
@@ -1085,7 +1089,7 @@ const google::protobuf::Field* FindFieldByNumber(
       return &type.fields(i);
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 // TODO(skarvaje): Replace FieldDescriptor by implementing IsTypePackable()
@@ -1106,7 +1110,7 @@ const google::protobuf::EnumValue* FindEnumValueByNumber(
       return &ev;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 // TODO(skarvaje): Look into optimizing this by not doing computation on
diff --git a/src/google/protobuf/util/internal/protostream_objectsource.h b/src/google/protobuf/util/internal/protostream_objectsource.h
index 63d5f455..b56efdf4 100644
--- a/src/google/protobuf/util/internal/protostream_objectsource.h
+++ b/src/google/protobuf/util/internal/protostream_objectsource.h
@@ -112,8 +112,11 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectSource : public ObjectSource {
 
   // Sets whether to always output enums as ints, by default this is off, and
   // enums are rendered as strings.
-  void set_use_ints_for_enums(bool value) {
-    use_ints_for_enums_ = value;
+  void set_use_ints_for_enums(bool value) { use_ints_for_enums_ = value; }
+
+  // Sets whether to use original proto field names
+  void set_preserve_proto_field_names(bool value) {
+    preserve_proto_field_names_ = value;
   }
 
   // Sets the max recursion depth of proto message to be deserialized. Proto
@@ -294,6 +297,9 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectSource : public ObjectSource {
   // Whether to render enums as ints always. Defaults to false.
   bool use_ints_for_enums_;
 
+  // Whether to preserve proto field names
+  bool preserve_proto_field_names_;
+
   // Tracks current recursion depth.
   mutable int recursion_depth_;
 
@@ -303,6 +309,9 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectSource : public ObjectSource {
   // Whether to render unknown fields.
   bool render_unknown_fields_;
 
+  // Whether to render unknown enum values.
+  bool render_unknown_enum_values_;
+
   // Whether to add trailing zeros for timestamp and duration.
   bool add_trailing_zeros_for_timestamp_and_duration_;
 
diff --git a/src/google/protobuf/util/internal/protostream_objectsource_test.cc b/src/google/protobuf/util/internal/protostream_objectsource_test.cc
index e215c4ab..df790728 100644
--- a/src/google/protobuf/util/internal/protostream_objectsource_test.cc
+++ b/src/google/protobuf/util/internal/protostream_objectsource_test.cc
@@ -31,9 +31,6 @@
 #include <google/protobuf/util/internal/protostream_objectsource.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <sstream>
 
 #include <google/protobuf/stubs/casts.h>
@@ -103,7 +100,8 @@ class ProtostreamObjectSourceTest
         ow_(&mock_),
         use_lower_camel_for_enums_(false),
         use_ints_for_enums_(false),
-        add_trailing_zeros_(false) {
+        add_trailing_zeros_(false),
+        render_unknown_enum_values_(true) {
     helper_.ResetTypeInfo(Book::descriptor(), Proto3Message::descriptor());
   }
 
@@ -111,7 +109,7 @@ class ProtostreamObjectSourceTest
 
   void DoTest(const Message& msg, const Descriptor* descriptor) {
     Status status = ExecuteTest(msg, descriptor);
-    EXPECT_EQ(Status::OK, status);
+    EXPECT_EQ(util::Status(), status);
   }
 
   Status ExecuteTest(const Message& msg, const Descriptor* descriptor) {
@@ -121,7 +119,7 @@ class ProtostreamObjectSourceTest
     ArrayInputStream arr_stream(proto.data(), proto.size());
     CodedInputStream in_stream(&arr_stream);
 
-    google::protobuf::scoped_ptr<ProtoStreamObjectSource> os(
+    std::unique_ptr<ProtoStreamObjectSource> os(
         helper_.NewProtoSource(&in_stream, GetTypeUrl(descriptor)));
     if (use_lower_camel_for_enums_) os->set_use_lower_camel_for_enums(true);
     if (use_ints_for_enums_) os->set_use_ints_for_enums(true);
@@ -276,6 +274,10 @@ class ProtostreamObjectSourceTest
 
   void AddTrailingZeros() { add_trailing_zeros_ = true; }
 
+  void SetRenderUnknownEnumValues(bool value) {
+    render_unknown_enum_values_ = value;
+  }
+
   testing::TypeInfoTestHelper helper_;
 
   ::testing::NiceMock<MockObjectWriter> mock_;
@@ -283,6 +285,7 @@ class ProtostreamObjectSourceTest
   bool use_lower_camel_for_enums_;
   bool use_ints_for_enums_;
   bool add_trailing_zeros_;
+  bool render_unknown_enum_values_;
 };
 
 INSTANTIATE_TEST_CASE_P(DifferentTypeInfoSourceTest,
@@ -484,7 +487,7 @@ TEST_P(ProtostreamObjectSourceTest,
   DoTest(book, Book::descriptor());
 }
 
-TEST_P(ProtostreamObjectSourceTest, LowerCamelEnumOutputTest) {
+TEST_P(ProtostreamObjectSourceTest, LowerCamelEnumOutputMacroCase) {
   Book book;
   book.set_type(Book::ACTION_AND_ADVENTURE);
 
@@ -494,6 +497,26 @@ TEST_P(ProtostreamObjectSourceTest, LowerCamelEnumOutputTest) {
   DoTest(book, Book::descriptor());
 }
 
+TEST_P(ProtostreamObjectSourceTest, LowerCamelEnumOutputSnakeCase) {
+  Book book;
+  book.set_type(Book::arts_and_photography);
+
+  UseLowerCamelForEnums();
+
+  ow_.StartObject("")->RenderString("type", "artsAndPhotography")->EndObject();
+  DoTest(book, Book::descriptor());
+}
+
+TEST_P(ProtostreamObjectSourceTest, LowerCamelEnumOutputWithNumber) {
+  Book book;
+  book.set_type(Book::I18N_Tech);
+
+  UseLowerCamelForEnums();
+
+  ow_.StartObject("")->RenderString("type", "i18nTech")->EndObject();
+  DoTest(book, Book::descriptor());
+}
+
 TEST_P(ProtostreamObjectSourceTest, EnumCaseIsUnchangedByDefault) {
   Book book;
   book.set_type(Book::ACTION_AND_ADVENTURE);
@@ -509,18 +532,31 @@ TEST_P(ProtostreamObjectSourceTest, UseIntsForEnumsTest) {
 
   UseIntsForEnums();
 
-  ow_.StartObject("")
-      ->RenderInt32("type", 3)
-      ->EndObject();
+  ow_.StartObject("")->RenderInt32("type", 3)->EndObject();
   DoTest(book, Book::descriptor());
 }
 
-TEST_P(ProtostreamObjectSourceTest, UnknownEnum) {
+TEST_P(ProtostreamObjectSourceTest,
+       UnknownEnumAreDroppedWhenRenderUnknownEnumValuesIsUnset) {
   Proto3Message message;
   message.set_enum_value(static_cast<Proto3Message::NestedEnum>(1234));
-  ow_.StartObject("")
-      ->RenderInt32("enumValue", 1234)
-      ->EndObject();
+
+  SetRenderUnknownEnumValues(false);
+
+  // Unknown enum values are not output.
+  ow_.StartObject("")->EndObject();
+  DoTest(message, Proto3Message::descriptor());
+}
+
+TEST_P(ProtostreamObjectSourceTest,
+       UnknownEnumAreOutputWhenRenderUnknownEnumValuesIsSet) {
+  Proto3Message message;
+  message.set_enum_value(static_cast<Proto3Message::NestedEnum>(1234));
+
+  SetRenderUnknownEnumValues(true);
+
+  // Unknown enum values are output.
+  ow_.StartObject("")->RenderInt32("enumValue", 1234)->EndObject();
   DoTest(message, Proto3Message::descriptor());
 }
 
diff --git a/src/google/protobuf/util/internal/protostream_objectwriter.cc b/src/google/protobuf/util/internal/protostream_objectwriter.cc
index 6c9bc30e..2edfd075 100644
--- a/src/google/protobuf/util/internal/protostream_objectwriter.cc
+++ b/src/google/protobuf/util/internal/protostream_objectwriter.cc
@@ -62,7 +62,7 @@ ProtoStreamObjectWriter::ProtoStreamObjectWriter(
     const ProtoStreamObjectWriter::Options& options)
     : ProtoWriter(type_resolver, type, output, listener),
       master_type_(type),
-      current_(NULL),
+      current_(nullptr),
       options_(options) {
   set_ignore_unknown_fields(options_.ignore_unknown_fields);
   set_use_lower_camel_for_enums(options_.use_lower_camel_for_enums);
@@ -73,18 +73,18 @@ ProtoStreamObjectWriter::ProtoStreamObjectWriter(
     strings::ByteSink* output, ErrorListener* listener)
     : ProtoWriter(typeinfo, type, output, listener),
       master_type_(type),
-      current_(NULL),
+      current_(nullptr),
       options_(ProtoStreamObjectWriter::Options::Defaults()) {}
 
 ProtoStreamObjectWriter::~ProtoStreamObjectWriter() {
-  if (current_ == NULL) return;
+  if (current_ == nullptr) return;
   // Cleanup explicitly in order to avoid destructor stack overflow when input
   // is deeply nested.
   // Cast to BaseElement to avoid doing additional checks (like missing fields)
   // during pop().
-  google::protobuf::scoped_ptr<BaseElement> element(
+  std::unique_ptr<BaseElement> element(
       static_cast<BaseElement*>(current_.get())->pop<BaseElement>());
-  while (element != NULL) {
+  while (element != nullptr) {
     element.reset(element->pop<BaseElement>());
   }
 }
@@ -173,7 +173,7 @@ Status GetNanosFromStringPiece(StringPiece s_nanos,
     *nanos = i_nanos * conversion;
   }
 
-  return Status::OK;
+  return Status();
 }
 
 }  // namespace
@@ -186,7 +186,7 @@ ProtoStreamObjectWriter::AnyWriter::AnyWriter(ProtoStreamObjectWriter* parent)
       output_(&data_),
       depth_(0),
       is_well_known_type_(false),
-      well_known_type_render_(NULL) {}
+      well_known_type_render_(nullptr) {}
 
 ProtoStreamObjectWriter::AnyWriter::~AnyWriter() {}
 
@@ -195,7 +195,7 @@ void ProtoStreamObjectWriter::AnyWriter::StartObject(StringPiece name) {
   // If an object writer is absent, that means we have not called StartAny()
   // before reaching here, which happens when we have data before the "@type"
   // field.
-  if (ow_ == NULL) {
+  if (ow_ == nullptr) {
     // Save data before the "@type" field for later replay.
     uninterpreted_events_.push_back(Event(Event::START_OBJECT, name));
   } else if (is_well_known_type_ && depth_ == 1) {
@@ -217,7 +217,7 @@ void ProtoStreamObjectWriter::AnyWriter::StartObject(StringPiece name) {
 
 bool ProtoStreamObjectWriter::AnyWriter::EndObject() {
   --depth_;
-  if (ow_ == NULL) {
+  if (ow_ == nullptr) {
     if (depth_ >= 0) {
       // Save data before the "@type" field for later replay.
       uninterpreted_events_.push_back(Event(Event::END_OBJECT));
@@ -239,7 +239,7 @@ bool ProtoStreamObjectWriter::AnyWriter::EndObject() {
 
 void ProtoStreamObjectWriter::AnyWriter::StartList(StringPiece name) {
   ++depth_;
-  if (ow_ == NULL) {
+  if (ow_ == nullptr) {
     // Save data before the "@type" field for later replay.
     uninterpreted_events_.push_back(Event(Event::START_LIST, name));
   } else if (is_well_known_type_ && depth_ == 1) {
@@ -260,7 +260,7 @@ void ProtoStreamObjectWriter::AnyWriter::EndList() {
     GOOGLE_LOG(DFATAL) << "Mismatched EndList found, should not be possible";
     depth_ = 0;
   }
-  if (ow_ == NULL) {
+  if (ow_ == nullptr) {
     // Save data before the "@type" field for later replay.
     uninterpreted_events_.push_back(Event(Event::END_LIST));
   } else {
@@ -272,9 +272,9 @@ void ProtoStreamObjectWriter::AnyWriter::RenderDataPiece(
     StringPiece name, const DataPiece& value) {
   // Start an Any only at depth_ 0. Other RenderDataPiece calls with "@type"
   // should go to the contained ow_ as they indicate nested Anys.
-  if (depth_ == 0 && ow_ == NULL && name == "@type") {
+  if (depth_ == 0 && ow_ == nullptr && name == "@type") {
     StartAny(value);
-  } else if (ow_ == NULL) {
+  } else if (ow_ == nullptr) {
     // Save data before the "@type" field.
     uninterpreted_events_.push_back(Event(name, value));
   } else if (depth_ == 0 && is_well_known_type_) {
@@ -283,7 +283,7 @@ void ProtoStreamObjectWriter::AnyWriter::RenderDataPiece(
                             "Expect a \"value\" field for well-known types.");
       invalid_ = true;
     }
-    if (well_known_type_render_ == NULL) {
+    if (well_known_type_render_ == nullptr) {
       // Only Any and Struct don't have a special type render but both of
       // them expect a JSON object (i.e., a StartObject() call).
       if (value.type() != DataPiece::TYPE_NULL && !invalid_) {
@@ -327,7 +327,7 @@ void ProtoStreamObjectWriter::AnyWriter::StartAny(const DataPiece& value) {
   const google::protobuf::Type* type = resolved_type.ValueOrDie();
 
   well_known_type_render_ = FindTypeRenderer(type_url_);
-  if (well_known_type_render_ != NULL ||
+  if (well_known_type_render_ != nullptr ||
       // Explicitly list Any and Struct here because they don't have a
       // custom renderer.
       type->name() == kAnyType || type->name() == kStructType) {
@@ -360,7 +360,7 @@ void ProtoStreamObjectWriter::AnyWriter::StartAny(const DataPiece& value) {
 }
 
 void ProtoStreamObjectWriter::AnyWriter::WriteAny() {
-  if (ow_ == NULL) {
+  if (ow_ == nullptr) {
     if (uninterpreted_events_.empty()) {
       // We never got any content, so just return immediately, which is
       // equivalent to writing an empty Any.
@@ -409,7 +409,7 @@ void ProtoStreamObjectWriter::AnyWriter::Event::DeepCopy() {
   // string value stays valid, we make a copy of the string value and update
   // DataPiece to reference our own copy.
   if (value_.type() == DataPiece::TYPE_STRING) {
-    value_.str().AppendToString(&value_storage_);
+    StrAppend(&value_storage_, value_.str());
     value_ = DataPiece(value_storage_, value_.use_strict_base64_decoding());
   } else if (value_.type() == DataPiece::TYPE_BYTES) {
     value_storage_ = value_.ToBytes().ValueOrDie();
@@ -421,7 +421,7 @@ void ProtoStreamObjectWriter::AnyWriter::Event::DeepCopy() {
 ProtoStreamObjectWriter::Item::Item(ProtoStreamObjectWriter* enclosing,
                                     ItemType item_type, bool is_placeholder,
                                     bool is_list)
-    : BaseElement(NULL),
+    : BaseElement(nullptr),
       ow_(enclosing),
       any_(),
       item_type_(item_type),
@@ -467,7 +467,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartObject(
   // Starting the root message. Create the root Item and return.
   // ANY message type does not need special handling, just set the ItemType
   // to ANY.
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     ProtoWriter::StartObject(name);
     current_.reset(new Item(
         this, master_type_.name() == kAnyType ? Item::ANY : Item::MESSAGE,
@@ -541,14 +541,14 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartObject(
 
     // If top of stack is g.p.Struct type, start the struct the map field within
     // it.
-    if (element() != NULL && IsStruct(*element()->parent_field())) {
+    if (element() != nullptr && IsStruct(*element()->parent_field())) {
       // Render "fields": [
       Push("fields", Item::MAP, true, true);
       return this;
     }
 
     // If top of stack is g.p.Value type, start the Struct within it.
-    if (element() != NULL && IsStructValue(*element()->parent_field())) {
+    if (element() != nullptr && IsStructValue(*element()->parent_field())) {
       // Render
       // "struct_value": {
       //   "fields": [
@@ -559,7 +559,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartObject(
   }
 
   const google::protobuf::Field* field = BeginNamed(name, false);
-  if (field == NULL) return this;
+  if (field == nullptr) return this;
 
   if (IsStruct(*field)) {
     // Start a struct object.
@@ -607,7 +607,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::EndObject() {
     return this;
   }
 
-  if (current_ == NULL) return this;
+  if (current_ == nullptr) return this;
 
   if (current_->IsAny()) {
     if (current_->any()->EndObject()) return this;
@@ -627,7 +627,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartList(StringPiece name) {
   // Since we cannot have a top-level repeated item in protobuf, the only way
   // this is valid is if we start a special type google.protobuf.ListValue or
   // google.protobuf.Value.
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     if (!name.empty()) {
       InvalidName(name, "Root element should not be named.");
       IncrementInvalidDepth();
@@ -706,7 +706,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartList(StringPiece name) {
     if (invalid_depth() > 0) return this;
 
     // case i and ii above. Start "list_value" field within g.p.Value
-    if (element() != NULL && element()->parent_field() != NULL) {
+    if (element() != nullptr && element()->parent_field() != nullptr) {
       // Render
       // "list_value": {
       //   "values": [  // Start this list
@@ -734,7 +734,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartList(StringPiece name) {
   // When name is empty and stack is not empty, we are rendering an item within
   // a list.
   if (name.empty()) {
-    if (element() != NULL && element()->parent_field() != NULL) {
+    if (element() != nullptr && element()->parent_field() != nullptr) {
       if (IsStructValue(*element()->parent_field())) {
         // Since it is g.p.Value, we bind directly to the list_value.
         // Render
@@ -765,7 +765,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::StartList(StringPiece name) {
 
   // name is not empty
   const google::protobuf::Field* field = Lookup(name);
-  if (field == NULL) {
+  if (field == nullptr) {
     IncrementInvalidDepth();
     return this;
   }
@@ -837,7 +837,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::EndList() {
     return this;
   }
 
-  if (current_ == NULL) return this;
+  if (current_ == nullptr) return this;
 
   if (current_->IsAny()) {
     current_->any()->EndList();
@@ -862,7 +862,7 @@ Status ProtoStreamObjectWriter::RenderStructValue(ProtoStreamObjectWriter* ow,
           ow->ProtoWriter::RenderDataPiece(
               "string_value",
               DataPiece(SimpleItoa(int_value.ValueOrDie()), true));
-          return Status::OK;
+          return Status();
         }
       }
       struct_field_name = "number_value";
@@ -877,13 +877,22 @@ Status ProtoStreamObjectWriter::RenderStructValue(ProtoStreamObjectWriter* ow,
           ow->ProtoWriter::RenderDataPiece(
               "string_value",
               DataPiece(SimpleItoa(int_value.ValueOrDie()), true));
-          return Status::OK;
+          return Status();
         }
       }
       struct_field_name = "number_value";
       break;
     }
     case DataPiece::TYPE_DOUBLE: {
+      if (ow->options_.struct_integers_as_strings) {
+        StatusOr<double> double_value = data.ToDouble();
+        if (double_value.ok()) {
+          ow->ProtoWriter::RenderDataPiece(
+              "string_value",
+              DataPiece(SimpleDtoa(double_value.ValueOrDie()), true));
+          return Status();
+        }
+      }
       struct_field_name = "number_value";
       break;
     }
@@ -906,12 +915,12 @@ Status ProtoStreamObjectWriter::RenderStructValue(ProtoStreamObjectWriter* ow,
     }
   }
   ow->ProtoWriter::RenderDataPiece(struct_field_name, data);
-  return Status::OK;
+  return Status();
 }
 
 Status ProtoStreamObjectWriter::RenderTimestamp(ProtoStreamObjectWriter* ow,
                                                 const DataPiece& data) {
-  if (data.type() == DataPiece::TYPE_NULL) return Status::OK;
+  if (data.type() == DataPiece::TYPE_NULL) return Status();
   if (data.type() != DataPiece::TYPE_STRING) {
     return Status(INVALID_ARGUMENT,
                   StrCat("Invalid data type for timestamp, value is ",
@@ -930,19 +939,19 @@ Status ProtoStreamObjectWriter::RenderTimestamp(ProtoStreamObjectWriter* ow,
 
   ow->ProtoWriter::RenderDataPiece("seconds", DataPiece(seconds));
   ow->ProtoWriter::RenderDataPiece("nanos", DataPiece(nanos));
-  return Status::OK;
+  return Status();
 }
 
 static inline util::Status RenderOneFieldPath(ProtoStreamObjectWriter* ow,
                                                 StringPiece path) {
   ow->ProtoWriter::RenderDataPiece(
       "paths", DataPiece(ConvertFieldMaskPath(path, &ToSnakeCase), true));
-  return Status::OK;
+  return Status();
 }
 
 Status ProtoStreamObjectWriter::RenderFieldMask(ProtoStreamObjectWriter* ow,
                                                 const DataPiece& data) {
-  if (data.type() == DataPiece::TYPE_NULL) return Status::OK;
+  if (data.type() == DataPiece::TYPE_NULL) return Status();
   if (data.type() != DataPiece::TYPE_STRING) {
     return Status(INVALID_ARGUMENT,
                   StrCat("Invalid data type for field mask, value is ",
@@ -952,14 +961,14 @@ Status ProtoStreamObjectWriter::RenderFieldMask(ProtoStreamObjectWriter* ow,
 // TODO(tsun): figure out how to do proto descriptor based snake case
 // conversions as much as possible. Because ToSnakeCase sometimes returns the
 // wrong value.
-  google::protobuf::scoped_ptr<ResultCallback1<util::Status, StringPiece> > callback(
-      NewPermanentCallback(&RenderOneFieldPath, ow));
+  std::unique_ptr<ResultCallback1<util::Status, StringPiece> > callback(
+      ::google::protobuf::NewPermanentCallback(&RenderOneFieldPath, ow));
   return DecodeCompactFieldMaskPaths(data.str(), callback.get());
 }
 
 Status ProtoStreamObjectWriter::RenderDuration(ProtoStreamObjectWriter* ow,
                                                const DataPiece& data) {
-  if (data.type() == DataPiece::TYPE_NULL) return Status::OK;
+  if (data.type() == DataPiece::TYPE_NULL) return Status();
   if (data.type() != DataPiece::TYPE_STRING) {
     return Status(INVALID_ARGUMENT,
                   StrCat("Invalid data type for duration, value is ",
@@ -968,13 +977,13 @@ Status ProtoStreamObjectWriter::RenderDuration(ProtoStreamObjectWriter* ow,
 
   StringPiece value(data.str());
 
-  if (!value.ends_with("s")) {
+  if (!StringEndsWith(value, "s")) {
     return Status(INVALID_ARGUMENT,
                   "Illegal duration format; duration must end with 's'");
   }
   value = value.substr(0, value.size() - 1);
   int sign = 1;
-  if (value.starts_with("-")) {
+  if (StringStartsWith(value, "-")) {
     sign = -1;
     value = value.substr(1);
   }
@@ -1004,14 +1013,14 @@ Status ProtoStreamObjectWriter::RenderDuration(ProtoStreamObjectWriter* ow,
 
   ow->ProtoWriter::RenderDataPiece("seconds", DataPiece(seconds));
   ow->ProtoWriter::RenderDataPiece("nanos", DataPiece(nanos));
-  return Status::OK;
+  return Status();
 }
 
 Status ProtoStreamObjectWriter::RenderWrapperType(ProtoStreamObjectWriter* ow,
                                                   const DataPiece& data) {
-  if (data.type() == DataPiece::TYPE_NULL) return Status::OK;
+  if (data.type() == DataPiece::TYPE_NULL) return Status();
   ow->ProtoWriter::RenderDataPiece("value", data);
-  return Status::OK;
+  return Status();
 }
 
 ProtoStreamObjectWriter* ProtoStreamObjectWriter::RenderDataPiece(
@@ -1019,10 +1028,10 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::RenderDataPiece(
   Status status;
   if (invalid_depth() > 0) return this;
 
-  if (current_ == NULL) {
+  if (current_ == nullptr) {
     const TypeRenderer* type_renderer =
         FindTypeRenderer(GetFullTypeWithUrl(master_type_.name()));
-    if (type_renderer == NULL) {
+    if (type_renderer == nullptr) {
       InvalidName(name, "Root element must be a message.");
       return this;
     }
@@ -1045,7 +1054,7 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::RenderDataPiece(
     return this;
   }
 
-  const google::protobuf::Field* field = NULL;
+  const google::protobuf::Field* field = nullptr;
   if (current_->IsMap()) {
     if (!ValidMapKey(name)) return this;
 
@@ -1055,14 +1064,14 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::RenderDataPiece(
     ProtoWriter::RenderDataPiece("key",
                                  DataPiece(name, use_strict_base64_decoding()));
     field = Lookup("value");
-    if (field == NULL) {
+    if (field == nullptr) {
       Pop();
       GOOGLE_LOG(DFATAL) << "Map does not have a value field.";
       return this;
     }
 
     const TypeRenderer* type_renderer = FindTypeRenderer(field->type_url());
-    if (type_renderer != NULL) {
+    if (type_renderer != nullptr) {
       // Map's value type is a special type. Render it like a message:
       // "value": {
       //   ... Render special type ...
@@ -1092,11 +1101,11 @@ ProtoStreamObjectWriter* ProtoStreamObjectWriter::RenderDataPiece(
   }
 
   field = Lookup(name);
-  if (field == NULL) return this;
+  if (field == nullptr) return this;
 
   // Check if the field is of special type. Render it accordingly if so.
   const TypeRenderer* type_renderer = FindTypeRenderer(field->type_url());
-  if (type_renderer != NULL) {
+  if (type_renderer != nullptr) {
     // Pass through null value only for google.protobuf.Value. For other
     // types we ignore null value just like for regular field types.
     if (data.type() != DataPiece::TYPE_NULL ||
@@ -1190,7 +1199,7 @@ ProtoStreamObjectWriter::FindTypeRenderer(const string& type_url) {
 }
 
 bool ProtoStreamObjectWriter::ValidMapKey(StringPiece unnormalized_name) {
-  if (current_ == NULL) return true;
+  if (current_ == nullptr) return true;
 
   if (!current_->InsertMapKeyIfNotPresent(unnormalized_name)) {
     listener()->InvalidName(
@@ -1215,10 +1224,10 @@ void ProtoStreamObjectWriter::Push(StringPiece name, Item::ItemType item_type,
 void ProtoStreamObjectWriter::Pop() {
   // Pop all placeholder items sending StartObject or StartList events to
   // ProtoWriter according to is_list value.
-  while (current_ != NULL && current_->is_placeholder()) {
+  while (current_ != nullptr && current_->is_placeholder()) {
     PopOneElement();
   }
-  if (current_ != NULL) {
+  if (current_ != nullptr) {
     PopOneElement();
   }
 }
diff --git a/src/google/protobuf/util/internal/protostream_objectwriter.h b/src/google/protobuf/util/internal/protostream_objectwriter.h
index 732971e1..c33a4639 100644
--- a/src/google/protobuf/util/internal/protostream_objectwriter.h
+++ b/src/google/protobuf/util/internal/protostream_objectwriter.h
@@ -76,11 +76,14 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectWriter : public ProtoWriter {
  public:
   // Options that control ProtoStreamObjectWriter class's behavior.
   struct Options {
-    // Treats integer inputs in google.protobuf.Struct as strings. Normally,
-    // integer values are returned in double field "number_value" of
+    // Treats numeric inputs in google.protobuf.Struct as strings. Normally,
+    // numeric values are returned in double field "number_value" of
     // google.protobuf.Struct. However, this can cause precision loss for
-    // int64/uint64 inputs. This option is provided for cases that want to
-    // preserve integer precision.
+    // int64/uint64/double inputs. This option is provided for cases that want
+    // to preserve number precision.
+    //
+    // TODO(skarvaje): Rename to struct_numbers_as_strings as it covers double
+    // as well.
     bool struct_integers_as_strings;
 
     // Not treat unknown fields as an error. If there is an unknown fields,
@@ -213,7 +216,7 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectWriter : public ProtoWriter {
     ProtoStreamObjectWriter* parent_;
 
     // The nested object writer, used to write events.
-    google::protobuf::scoped_ptr<ProtoStreamObjectWriter> ow_;
+    std::unique_ptr<ProtoStreamObjectWriter> ow_;
 
     // The type_url_ that this Any represents.
     string type_url_;
@@ -289,14 +292,14 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectWriter : public ProtoWriter {
     ProtoStreamObjectWriter* ow_;
 
     // A writer for Any objects, handles all Any-related nonsense.
-    google::protobuf::scoped_ptr<AnyWriter> any_;
+    std::unique_ptr<AnyWriter> any_;
 
     // The type of this element, see enum for permissible types.
     ItemType item_type_;
 
     // Set of map keys already seen for the type_. Used to validate incoming
     // messages so no map key appears more than once.
-    google::protobuf::scoped_ptr<hash_set<string> > map_keys_;
+    std::unique_ptr<hash_set<string> > map_keys_;
 
     // Conveys whether this Item is a placeholder or not. Placeholder items are
     // pushed to stack to account for special types.
@@ -389,7 +392,7 @@ class LIBPROTOBUF_EXPORT ProtoStreamObjectWriter : public ProtoWriter {
   const google::protobuf::Type& master_type_;
 
   // The current element, variable for internal state processing.
-  google::protobuf::scoped_ptr<Item> current_;
+  std::unique_ptr<Item> current_;
 
   // Reference to the options that control this class's behavior.
   const ProtoStreamObjectWriter::Options options_;
diff --git a/src/google/protobuf/util/internal/protostream_objectwriter_test.cc b/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
index a9b15e68..7f0df567 100644
--- a/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
+++ b/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
@@ -74,6 +74,8 @@ using google::protobuf::testing::Primitive;
 using google::protobuf::testing::Proto3Message;
 using google::protobuf::testing::Publisher;
 using google::protobuf::testing::StructType;
+using google::protobuf::testing::TestJsonName1;
+using google::protobuf::testing::TestJsonName2;
 using google::protobuf::testing::TimestampDuration;
 using google::protobuf::testing::ValueWrapper;
 using google::protobuf::testing::oneofs::OneOfsRequest;
@@ -144,7 +146,7 @@ class BaseProtoStreamObjectWriterTest
 
   void CheckOutput(const Message& expected, int expected_length) {
     size_t nbytes;
-    google::protobuf::scoped_array<char> buffer(output_->GetBuffer(&nbytes));
+    std::unique_ptr<char[]> buffer(output_->GetBuffer(&nbytes));
     if (expected_length >= 0) {
       EXPECT_EQ(expected_length, nbytes);
     }
@@ -152,7 +154,7 @@ class BaseProtoStreamObjectWriterTest
 
     std::stringbuf str_buf(str, std::ios_base::in);
     std::istream istream(&str_buf);
-    google::protobuf::scoped_ptr<Message> message(expected.New());
+    std::unique_ptr<Message> message(expected.New());
     message->ParsePartialFromIstream(&istream);
 
     if (!MessageDifferencer::Equivalent(expected, *message)) {
@@ -168,8 +170,8 @@ class BaseProtoStreamObjectWriterTest
 
   testing::TypeInfoTestHelper helper_;
   MockErrorListener listener_;
-  google::protobuf::scoped_ptr<GrowingArrayByteSink> output_;
-  google::protobuf::scoped_ptr<ProtoStreamObjectWriter> ow_;
+  std::unique_ptr<GrowingArrayByteSink> output_;
+  std::unique_ptr<ProtoStreamObjectWriter> ow_;
   ProtoStreamObjectWriter::Options options_;
 };
 
@@ -271,6 +273,22 @@ TEST_P(ProtoStreamObjectWriterTest, CustomJsonName) {
   CheckOutput(book);
 }
 
+// Test that two messages can have different fields mapped to the same JSON
+// name. See: https://github.com/google/protobuf/issues/1415
+TEST_P(ProtoStreamObjectWriterTest, ConflictingJsonName) {
+  ResetTypeInfo(TestJsonName1::descriptor());
+  TestJsonName1 message1;
+  message1.set_one_value(12345);
+  ow_->StartObject("")->RenderInt32("value", 12345)->EndObject();
+  CheckOutput(message1);
+
+  ResetTypeInfo(TestJsonName2::descriptor());
+  TestJsonName2 message2;
+  message2.set_another_value(12345);
+  ow_->StartObject("")->RenderInt32("value", 12345)->EndObject();
+  CheckOutput(message2);
+}
+
 TEST_P(ProtoStreamObjectWriterTest, IntEnumValuesAreAccepted) {
   Book book;
   book.set_title("Some Book");
@@ -1593,7 +1611,7 @@ TEST_P(ProtoStreamObjectWriterStructTest, RepeatedStructMapObjectKeyTest) {
 TEST_P(ProtoStreamObjectWriterStructTest, OptionStructIntAsStringsTest) {
   StructType struct_type;
   google::protobuf::Struct* s = struct_type.mutable_object();
-  s->mutable_fields()->operator[]("k1").set_number_value(123);
+  s->mutable_fields()->operator[]("k1").set_string_value("123");
   s->mutable_fields()->operator[]("k2").set_bool_value(true);
   s->mutable_fields()->operator[]("k3").set_string_value("-222222222");
   s->mutable_fields()->operator[]("k4").set_string_value("33333333");
diff --git a/src/google/protobuf/util/internal/structured_objectwriter.h b/src/google/protobuf/util/internal/structured_objectwriter.h
index 3f065d6b..8e63222b 100644
--- a/src/google/protobuf/util/internal/structured_objectwriter.h
+++ b/src/google/protobuf/util/internal/structured_objectwriter.h
@@ -32,9 +32,6 @@
 #define GOOGLE_PROTOBUF_UTIL_CONVERTER_STRUCTURED_OBJECTWRITER_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 
 #include <google/protobuf/stubs/casts.h>
 #include <google/protobuf/stubs/common.h>
@@ -80,7 +77,7 @@ class LIBPROTOBUF_EXPORT StructuredObjectWriter : public ObjectWriter {
     }
 
     // Returns true if this element is the root.
-    bool is_root() const { return parent_ == NULL; }
+    bool is_root() const { return parent_ == nullptr; }
 
     // Returns the number of hops from this element to the root element.
     int level() const { return level_; }
@@ -91,10 +88,10 @@ class LIBPROTOBUF_EXPORT StructuredObjectWriter : public ObjectWriter {
 
    private:
     // Pointer to the parent Element.
-    google::protobuf::scoped_ptr<BaseElement> parent_;
+    std::unique_ptr<BaseElement> parent_;
 
     // Number of hops to the root Element.
-    // The root Element has NULL parent_ and a level_ of 0.
+    // The root Element has nullptr parent_ and a level_ of 0.
     const int level_;
 
     GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(BaseElement);
diff --git a/src/google/protobuf/util/internal/testdata/books.proto b/src/google/protobuf/util/internal/testdata/books.proto
index 9fe4f7aa..5630cc78 100644
--- a/src/google/protobuf/util/internal/testdata/books.proto
+++ b/src/google/protobuf/util/internal/testdata/books.proto
@@ -65,6 +65,7 @@ message Book {
     KIDS = 2;
     ACTION_AND_ADVENTURE = 3;
     arts_and_photography = 4;
+    I18N_Tech = 5;
   }
   optional Type type = 11;
 
@@ -190,3 +191,12 @@ message Cyclic {
   repeated Author m_author = 5;
   optional Cyclic m_cyclic = 4;
 }
+
+// Test that two messages can have different fields mapped to the same JSON
+// name. See: https://github.com/google/protobuf/issues/1415
+message TestJsonName1 {
+  optional int32 one_value = 1 [json_name = "value"];
+}
+message TestJsonName2 {
+  optional int32 another_value = 1 [json_name = "value"];
+}
diff --git a/src/google/protobuf/util/internal/type_info.cc b/src/google/protobuf/util/internal/type_info.cc
index 17d58475..3847b179 100644
--- a/src/google/protobuf/util/internal/type_info.cc
+++ b/src/google/protobuf/util/internal/type_info.cc
@@ -69,7 +69,7 @@ class TypeInfoForTypeResolver : public TypeInfo {
     // cached_types_ map.
     const string& string_type_url =
         *string_storage_.insert(type_url.ToString()).first;
-    google::protobuf::scoped_ptr<google::protobuf::Type> type(new google::protobuf::Type());
+    std::unique_ptr<google::protobuf::Type> type(new google::protobuf::Type());
     util::Status status =
         type_resolver_->ResolveMessageType(string_type_url, type.get());
     StatusOrType result =
@@ -95,7 +95,7 @@ class TypeInfoForTypeResolver : public TypeInfo {
     // cached_enums_ map.
     const string& string_type_url =
         *string_storage_.insert(type_url.ToString()).first;
-    google::protobuf::scoped_ptr<google::protobuf::Enum> enum_type(
+    std::unique_ptr<google::protobuf::Enum> enum_type(
         new google::protobuf::Enum());
     util::Status status =
         type_resolver_->ResolveEnumType(string_type_url, enum_type.get());
@@ -107,12 +107,14 @@ class TypeInfoForTypeResolver : public TypeInfo {
 
   virtual const google::protobuf::Field* FindField(
       const google::protobuf::Type* type, StringPiece camel_case_name) const {
-    if (indexed_types_.find(type) == indexed_types_.end()) {
-      PopulateNameLookupTable(type);
-      indexed_types_.insert(type);
-    }
+    std::map<const google::protobuf::Type*, CamelCaseNameTable>::const_iterator
+        it = indexed_types_.find(type);
+    const CamelCaseNameTable& camel_case_name_table =
+        (it == indexed_types_.end())
+            ? PopulateNameLookupTable(type, &indexed_types_[type])
+            : it->second;
     StringPiece name =
-        FindWithDefault(camel_case_name_table_, camel_case_name, StringPiece());
+        FindWithDefault(camel_case_name_table, camel_case_name, StringPiece());
     if (name.empty()) {
       // Didn't find a mapping. Use whatever provided.
       name = camel_case_name;
@@ -123,6 +125,7 @@ class TypeInfoForTypeResolver : public TypeInfo {
  private:
   typedef util::StatusOr<const google::protobuf::Type*> StatusOrType;
   typedef util::StatusOr<const google::protobuf::Enum*> StatusOrEnum;
+  typedef std::map<StringPiece, StringPiece> CamelCaseNameTable;
 
   template <typename T>
   static void DeleteCachedTypes(std::map<StringPiece, T>* cached_types) {
@@ -134,32 +137,35 @@ class TypeInfoForTypeResolver : public TypeInfo {
     }
   }
 
-  void PopulateNameLookupTable(const google::protobuf::Type* type) const {
+  const CamelCaseNameTable& PopulateNameLookupTable(
+      const google::protobuf::Type* type,
+      CamelCaseNameTable* camel_case_name_table) const {
     for (int i = 0; i < type->fields_size(); ++i) {
       const google::protobuf::Field& field = type->fields(i);
       StringPiece name = field.name();
       StringPiece camel_case_name = field.json_name();
-      const StringPiece* existing = InsertOrReturnExisting(
-          &camel_case_name_table_, camel_case_name, name);
+      const StringPiece* existing =
+          InsertOrReturnExisting(camel_case_name_table, camel_case_name, name);
       if (existing && *existing != name) {
         GOOGLE_LOG(WARNING) << "Field '" << name << "' and '" << *existing
                      << "' map to the same camel case name '" << camel_case_name
                      << "'.";
       }
     }
+    return *camel_case_name_table;
   }
 
   TypeResolver* type_resolver_;
 
   // Stores string values that will be referenced by StringPieces in
-  // cached_types_, cached_enums_ and camel_case_name_table_.
+  // cached_types_, cached_enums_.
   mutable std::set<string> string_storage_;
 
   mutable std::map<StringPiece, StatusOrType> cached_types_;
   mutable std::map<StringPiece, StatusOrEnum> cached_enums_;
 
-  mutable std::set<const google::protobuf::Type*> indexed_types_;
-  mutable std::map<StringPiece, StringPiece> camel_case_name_table_;
+  mutable std::map<const google::protobuf::Type*, CamelCaseNameTable>
+      indexed_types_;
 };
 }  // namespace
 
diff --git a/src/google/protobuf/util/internal/type_info_test_helper.cc b/src/google/protobuf/util/internal/type_info_test_helper.cc
index 737ba9e4..281a7f58 100644
--- a/src/google/protobuf/util/internal/type_info_test_helper.cc
+++ b/src/google/protobuf/util/internal/type_info_test_helper.cc
@@ -31,9 +31,6 @@
 #include <google/protobuf/util/internal/type_info_test_helper.h>
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/stubs/logging.h>
diff --git a/src/google/protobuf/util/internal/type_info_test_helper.h b/src/google/protobuf/util/internal/type_info_test_helper.h
index 1a196715..5a077e04 100644
--- a/src/google/protobuf/util/internal/type_info_test_helper.h
+++ b/src/google/protobuf/util/internal/type_info_test_helper.h
@@ -32,9 +32,6 @@
 #define GOOGLE_PROTOBUF_UTIL_CONVERTER_TYPE_INFO_TEST_HELPER_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <vector>
 
 #include <google/protobuf/io/coded_stream.h>
@@ -86,8 +83,8 @@ class TypeInfoTestHelper {
 
  private:
   TypeInfoSource type_;
-  google::protobuf::scoped_ptr<TypeInfo> typeinfo_;
-  google::protobuf::scoped_ptr<TypeResolver> type_resolver_;
+  std::unique_ptr<TypeInfo> typeinfo_;
+  std::unique_ptr<TypeResolver> type_resolver_;
 };
 }  // namespace testing
 }  // namespace converter
diff --git a/src/google/protobuf/util/internal/utility.cc b/src/google/protobuf/util/internal/utility.cc
index 6daf24eb..b8d917ce 100644
--- a/src/google/protobuf/util/internal/utility.cc
+++ b/src/google/protobuf/util/internal/utility.cc
@@ -48,21 +48,11 @@ namespace protobuf {
 namespace util {
 namespace converter {
 
-namespace {
-const StringPiece SkipWhiteSpace(StringPiece str) {
-  StringPiece::size_type i;
-  for (i = 0; i < str.size() && isspace(str[i]); ++i) {
-  }
-  GOOGLE_DCHECK(i == str.size() || !isspace(str[i]));
-  return str.substr(i);
-}
-}  // namespace
-
 bool GetBoolOptionOrDefault(
     const google::protobuf::RepeatedPtrField<google::protobuf::Option>& options,
     const string& option_name, bool default_value) {
   const google::protobuf::Option* opt = FindOptionOrNull(options, option_name);
-  if (opt == NULL) {
+  if (opt == nullptr) {
     return default_value;
   }
   return GetBoolFromAny(opt->value());
@@ -72,7 +62,7 @@ int64 GetInt64OptionOrDefault(
     const google::protobuf::RepeatedPtrField<google::protobuf::Option>& options,
     const string& option_name, int64 default_value) {
   const google::protobuf::Option* opt = FindOptionOrNull(options, option_name);
-  if (opt == NULL) {
+  if (opt == nullptr) {
     return default_value;
   }
   return GetInt64FromAny(opt->value());
@@ -82,7 +72,7 @@ double GetDoubleOptionOrDefault(
     const google::protobuf::RepeatedPtrField<google::protobuf::Option>& options,
     const string& option_name, double default_value) {
   const google::protobuf::Option* opt = FindOptionOrNull(options, option_name);
-  if (opt == NULL) {
+  if (opt == nullptr) {
     return default_value;
   }
   return GetDoubleFromAny(opt->value());
@@ -92,7 +82,7 @@ string GetStringOptionOrDefault(
     const google::protobuf::RepeatedPtrField<google::protobuf::Option>& options,
     const string& option_name, const string& default_value) {
   const google::protobuf::Option* opt = FindOptionOrNull(options, option_name);
-  if (opt == NULL) {
+  if (opt == nullptr) {
     return default_value;
   }
   return GetStringFromAny(opt->value());
@@ -134,7 +124,10 @@ const StringPiece GetTypeWithoutUrl(StringPiece type_url) {
     return type_url.substr(kTypeUrlSize + 1);
   } else {
     size_t idx = type_url.rfind('/');
-    return type_url.substr(idx + 1);
+    if (idx != type_url.npos) {
+      type_url.remove_prefix(idx + 1);
+    }
+    return type_url;
   }
 }
 
@@ -151,12 +144,12 @@ const google::protobuf::Option* FindOptionOrNull(
       return &opt;
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::Field* FindFieldInTypeOrNull(
     const google::protobuf::Type* type, StringPiece field_name) {
-  if (type != NULL) {
+  if (type != nullptr) {
     for (int i = 0; i < type->fields_size(); ++i) {
       const google::protobuf::Field& field = type->fields(i);
       if (field.name() == field_name) {
@@ -164,12 +157,12 @@ const google::protobuf::Field* FindFieldInTypeOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::Field* FindJsonFieldInTypeOrNull(
     const google::protobuf::Type* type, StringPiece json_name) {
-  if (type != NULL) {
+  if (type != nullptr) {
     for (int i = 0; i < type->fields_size(); ++i) {
       const google::protobuf::Field& field = type->fields(i);
       if (field.json_name() == json_name) {
@@ -177,12 +170,12 @@ const google::protobuf::Field* FindJsonFieldInTypeOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::Field* FindFieldInTypeByNumberOrNull(
     const google::protobuf::Type* type, int32 number) {
-  if (type != NULL) {
+  if (type != nullptr) {
     for (int i = 0; i < type->fields_size(); ++i) {
       const google::protobuf::Field& field = type->fields(i);
       if (field.number() == number) {
@@ -190,12 +183,12 @@ const google::protobuf::Field* FindFieldInTypeByNumberOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::EnumValue* FindEnumValueByNameOrNull(
     const google::protobuf::Enum* enum_type, StringPiece enum_name) {
-  if (enum_type != NULL) {
+  if (enum_type != nullptr) {
     for (int i = 0; i < enum_type->enumvalue_size(); ++i) {
       const google::protobuf::EnumValue& enum_value = enum_type->enumvalue(i);
       if (enum_value.name() == enum_name) {
@@ -203,12 +196,12 @@ const google::protobuf::EnumValue* FindEnumValueByNameOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::EnumValue* FindEnumValueByNumberOrNull(
     const google::protobuf::Enum* enum_type, int32 value) {
-  if (enum_type != NULL) {
+  if (enum_type != nullptr) {
     for (int i = 0; i < enum_type->enumvalue_size(); ++i) {
       const google::protobuf::EnumValue& enum_value = enum_type->enumvalue(i);
       if (enum_value.number() == value) {
@@ -216,12 +209,12 @@ const google::protobuf::EnumValue* FindEnumValueByNumberOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
 }
 
 const google::protobuf::EnumValue* FindEnumValueByNameWithoutUnderscoreOrNull(
     const google::protobuf::Enum* enum_type, StringPiece enum_name) {
-  if (enum_type != NULL) {
+  if (enum_type != nullptr) {
     for (int i = 0; i < enum_type->enumvalue_size(); ++i) {
       const google::protobuf::EnumValue& enum_value = enum_type->enumvalue(i);
       string enum_name_without_underscore = enum_value.name();
@@ -242,7 +235,14 @@ const google::protobuf::EnumValue* FindEnumValueByNameWithoutUnderscoreOrNull(
       }
     }
   }
-  return NULL;
+  return nullptr;
+}
+
+string EnumValueNameToLowerCamelCase(const StringPiece input) {
+  string input_string(input);
+  std::transform(input_string.begin(), input_string.end(), input_string.begin(),
+                 ::tolower);
+  return ToCamelCase(input_string);
 }
 
 string ToCamelCase(const StringPiece input) {
@@ -360,8 +360,6 @@ bool IsMap(const google::protobuf::Field& field,
              google::protobuf::Field_Cardinality_CARDINALITY_REPEATED &&
          (GetBoolOptionOrDefault(type.options(), "map_entry", false) ||
           GetBoolOptionOrDefault(type.options(),
-                                 "google.protobuf.MessageOptions.map_entry", false) ||
-          GetBoolOptionOrDefault(type.options(),
                                  "google.protobuf.MessageOptions.map_entry",
                                  false));
 }
@@ -369,9 +367,6 @@ bool IsMap(const google::protobuf::Field& field,
 bool IsMessageSetWireFormat(const google::protobuf::Type& type) {
   return GetBoolOptionOrDefault(type.options(), "message_set_wire_format",
                                 false) ||
-         GetBoolOptionOrDefault(type.options(),
-                                "google.protobuf.MessageOptions.message_set_wire_format",
-                                false) ||
          GetBoolOptionOrDefault(
              type.options(),
              "google.protobuf.MessageOptions.message_set_wire_format", false);
@@ -410,6 +405,13 @@ bool SafeStrToFloat(StringPiece str, float* value) {
   return true;
 }
 
+bool StringStartsWith(StringPiece text, StringPiece prefix) {
+  return text.starts_with(prefix);
+}
+
+bool StringEndsWith(StringPiece text, StringPiece suffix) {
+  return text.ends_with(suffix);
+}
 }  // namespace converter
 }  // namespace util
 }  // namespace protobuf
diff --git a/src/google/protobuf/util/internal/utility.h b/src/google/protobuf/util/internal/utility.h
index 667e660c..d8e06a97 100644
--- a/src/google/protobuf/util/internal/utility.h
+++ b/src/google/protobuf/util/internal/utility.h
@@ -32,9 +32,6 @@
 #define GOOGLE_PROTOBUF_UTIL_CONVERTER_UTILITY_H__
 
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <utility>
 
@@ -121,13 +118,13 @@ LIBPROTOBUF_EXPORT const StringPiece GetTypeWithoutUrl(StringPiece type_url);
 LIBPROTOBUF_EXPORT const string GetFullTypeWithUrl(StringPiece simple_type);
 
 // Finds and returns option identified by name and option_name within the
-// provided map. Returns NULL if none found.
+// provided map. Returns nullptr if none found.
 const google::protobuf::Option* FindOptionOrNull(
     const google::protobuf::RepeatedPtrField<google::protobuf::Option>& options,
     const string& option_name);
 
 // Finds and returns the field identified by field_name in the passed tech Type
-// object. Returns NULL if none found.
+// object. Returns nullptr if none found.
 const google::protobuf::Field* FindFieldInTypeOrNull(
     const google::protobuf::Type* type, StringPiece field_name);
 
@@ -141,17 +138,17 @@ const google::protobuf::Field* FindFieldInTypeByNumberOrNull(
     const google::protobuf::Type* type, int32 number);
 
 // Finds and returns the EnumValue identified by enum_name in the passed tech
-// Enum object. Returns NULL if none found.
+// Enum object. Returns nullptr if none found.
 const google::protobuf::EnumValue* FindEnumValueByNameOrNull(
     const google::protobuf::Enum* enum_type, StringPiece enum_name);
 
 // Finds and returns the EnumValue identified by value in the passed tech
-// Enum object. Returns NULL if none found.
+// Enum object. Returns nullptr if none found.
 const google::protobuf::EnumValue* FindEnumValueByNumberOrNull(
     const google::protobuf::Enum* enum_type, int32 value);
 
 // Finds and returns the EnumValue identified by enum_name without underscore in
-// the passed tech Enum object. Returns NULL if none found.
+// the passed tech Enum object. Returns nullptr if none found.
 // For Ex. if enum_name is ACTIONANDADVENTURE it can get accepted if
 // EnumValue's name is action_and_adventure or ACTION_AND_ADVENTURE.
 const google::protobuf::EnumValue* FindEnumValueByNameWithoutUnderscoreOrNull(
@@ -160,6 +157,9 @@ const google::protobuf::EnumValue* FindEnumValueByNameWithoutUnderscoreOrNull(
 // Converts input to camel-case and returns it.
 LIBPROTOBUF_EXPORT string ToCamelCase(const StringPiece input);
 
+// Converts enum name string to camel-case and returns it.
+string EnumValueNameToLowerCamelCase(const StringPiece input);
+
 // Converts input to snake_case and returns it.
 LIBPROTOBUF_EXPORT string ToSnakeCase(StringPiece input);
 
@@ -200,6 +200,12 @@ inline string ValueAsString(double value) {
 // Converts a string to float. Unlike safe_strtof, conversion will fail if the
 // value fits into double but not float (e.g., DBL_MAX).
 LIBPROTOBUF_EXPORT bool SafeStrToFloat(StringPiece str, float* value);
+
+// Returns whether a StringPiece begins with the provided prefix.
+bool StringStartsWith(StringPiece text, StringPiece prefix);
+
+// Returns whether a StringPiece ends with the provided suffix.
+bool StringEndsWith(StringPiece text, StringPiece suffix);
 }  // namespace converter
 }  // namespace util
 }  // namespace protobuf
diff --git a/src/google/protobuf/util/json_format_proto3.proto b/src/google/protobuf/util/json_format_proto3.proto
index 8a0441c8..cbc3f81f 100644
--- a/src/google/protobuf/util/json_format_proto3.proto
+++ b/src/google/protobuf/util/json_format_proto3.proto
@@ -181,3 +181,9 @@ message TestCustomJsonName {
 message TestExtensions {
   .protobuf_unittest.TestAllExtensions extensions = 1;
 }
+
+message TestEnumValue{
+  EnumType enum_value1 = 1;
+  EnumType enum_value2 = 2;
+  EnumType enum_value3 = 3;
+}
\ No newline at end of file
diff --git a/src/google/protobuf/util/json_util.cc b/src/google/protobuf/util/json_util.cc
index 129b6eaf..f81a7a30 100644
--- a/src/google/protobuf/util/json_util.cc
+++ b/src/google/protobuf/util/json_util.cc
@@ -50,7 +50,9 @@ namespace util {
 
 namespace internal {
 ZeroCopyStreamByteSink::~ZeroCopyStreamByteSink() {
-  stream_->BackUp(buffer_size_);
+  if (buffer_size_ > 0) {
+    stream_->BackUp(buffer_size_);
+  }
 }
 
 void ZeroCopyStreamByteSink::Append(const char* bytes, size_t len) {
@@ -61,9 +63,11 @@ void ZeroCopyStreamByteSink::Append(const char* bytes, size_t len) {
       buffer_size_ -= len;
       return;
     }
-    memcpy(buffer_, bytes, buffer_size_);
-    bytes += buffer_size_;
-    len -= buffer_size_;
+    if (buffer_size_ > 0) {
+      memcpy(buffer_, bytes, buffer_size_);
+      bytes += buffer_size_;
+      len -= buffer_size_;
+    }
     if (!stream_->Next(&buffer_, &buffer_size_)) {
       // There isn't a way for ByteSink to report errors.
       buffer_size_ = 0;
@@ -83,12 +87,18 @@ util::Status BinaryToJsonStream(TypeResolver* resolver,
   RETURN_IF_ERROR(resolver->ResolveMessageType(type_url, &type));
   converter::ProtoStreamObjectSource proto_source(&in_stream, resolver, type);
   proto_source.set_use_ints_for_enums(options.always_print_enums_as_ints);
+  proto_source.set_preserve_proto_field_names(
+      options.preserve_proto_field_names);
   io::CodedOutputStream out_stream(json_output);
   converter::JsonObjectWriter json_writer(options.add_whitespace ? " " : "",
                                           &out_stream);
   if (options.always_print_primitive_fields) {
     converter::DefaultValueObjectWriter default_value_writer(
         resolver, type, &json_writer);
+    default_value_writer.set_preserve_proto_field_names(
+        options.preserve_proto_field_names);
+    default_value_writer.set_print_enums_as_ints(
+        options.always_print_enums_as_ints);
     return proto_source.WriteTo(&default_value_writer);
   } else {
     return proto_source.WriteTo(&json_writer);
@@ -109,7 +119,7 @@ util::Status BinaryToJsonString(TypeResolver* resolver,
 namespace {
 class StatusErrorListener : public converter::ErrorListener {
  public:
-  StatusErrorListener() : status_(util::Status::OK) {}
+  StatusErrorListener() {}
   virtual ~StatusErrorListener() {}
 
   util::Status GetStatus() { return status_; }
@@ -117,22 +127,22 @@ class StatusErrorListener : public converter::ErrorListener {
   virtual void InvalidName(const converter::LocationTrackerInterface& loc,
                            StringPiece unknown_name, StringPiece message) {
     status_ = util::Status(util::error::INVALID_ARGUMENT,
-                             loc.ToString() + ": " + message.ToString());
+                             loc.ToString() + ": " + string(message));
   }
 
   virtual void InvalidValue(const converter::LocationTrackerInterface& loc,
                             StringPiece type_name, StringPiece value) {
     status_ =
         util::Status(util::error::INVALID_ARGUMENT,
-                       loc.ToString() + ": invalid value " + value.ToString() +
-                           " for type " + type_name.ToString());
+                       loc.ToString() + ": invalid value " + string(value) +
+                           " for type " + string(type_name));
   }
 
   virtual void MissingField(const converter::LocationTrackerInterface& loc,
                             StringPiece missing_name) {
     status_ = util::Status(
         util::error::INVALID_ARGUMENT,
-        loc.ToString() + ": missing field " + missing_name.ToString());
+        loc.ToString() + ": missing field " + string(missing_name));
   }
 
  private:
diff --git a/src/google/protobuf/util/json_util.h b/src/google/protobuf/util/json_util.h
index 53b1d1ba..b1c69813 100644
--- a/src/google/protobuf/util/json_util.h
+++ b/src/google/protobuf/util/json_util.h
@@ -56,19 +56,22 @@ struct JsonPrintOptions {
   // Whether to add spaces, line breaks and indentation to make the JSON output
   // easy to read.
   bool add_whitespace;
-  // Whether to always print primitive fields. By default primitive fields with
-  // default values will be omitted in JSON joutput. For example, an int32 field
-  // set to 0 will be omitted. Set this flag to true will override the default
-  // behavior and print primitive fields regardless of their values.
+  // Whether to always print primitive fields. By default proto3 primitive
+  // fields with default values will be omitted in JSON output. For example, an
+  // int32 field set to 0 will be omitted. Set this flag to true will override
+  // the default behavior and print primitive fields regardless of their values.
   bool always_print_primitive_fields;
   // Whether to always print enums as ints. By default they are rendered as
   // strings.
   bool always_print_enums_as_ints;
-
-  JsonPrintOptions() : add_whitespace(false),
-                       always_print_primitive_fields(false),
-                       always_print_enums_as_ints(false) {
-  }
+  // Whether to preserve proto field names
+  bool preserve_proto_field_names;
+
+  JsonPrintOptions()
+      : add_whitespace(false),
+        always_print_primitive_fields(false),
+        always_print_enums_as_ints(false),
+        preserve_proto_field_names(false) {}
 };
 
 // DEPRECATED. Use JsonPrintOptions instead.
@@ -176,7 +179,7 @@ namespace internal {
 class LIBPROTOBUF_EXPORT ZeroCopyStreamByteSink : public strings::ByteSink {
  public:
   explicit ZeroCopyStreamByteSink(io::ZeroCopyOutputStream* stream)
-      : stream_(stream), buffer_size_(0) {}
+      : stream_(stream), buffer_(NULL), buffer_size_(0) {}
   ~ZeroCopyStreamByteSink();
 
   virtual void Append(const char* bytes, size_t len);
diff --git a/src/google/protobuf/util/json_util_test.cc b/src/google/protobuf/util/json_util_test.cc
index b0c2f494..ed9092df 100644
--- a/src/google/protobuf/util/json_util_test.cc
+++ b/src/google/protobuf/util/json_util_test.cc
@@ -34,6 +34,7 @@
 #include <string>
 
 #include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/io/zero_copy_stream_impl.h>
 #include <google/protobuf/descriptor_database.h>
 #include <google/protobuf/dynamic_message.h>
 #include <google/protobuf/util/internal/testdata/maps.pb.h>
@@ -47,18 +48,16 @@ namespace protobuf {
 namespace util {
 namespace {
 
+using google::protobuf::testing::MapIn;
 using proto3::FOO;
 using proto3::BAR;
 using proto3::TestMessage;
 using proto3::TestMap;
-using testing::MapIn;
+using proto3::TestOneof;
+using proto3::TestEnumValue;
 
 static const char kTypeUrlPrefix[] = "type.googleapis.com";
 
-static string GetTypeUrl(const Descriptor* message) {
-  return string(kTypeUrlPrefix) + "/" + message->full_name();
-}
-
 // As functions defined in json_util.h are just thin wrappers around the
 // JSON conversion code in //net/proto2/util/converter, in this test we
 // only cover some very basic cases to make sure the wrappers have forwarded
@@ -84,7 +83,7 @@ class JsonUtilTest : public ::testing::Test {
     return FromJson(json, message, JsonParseOptions());
   }
 
-  google::protobuf::scoped_ptr<TypeResolver> resolver_;
+  std::unique_ptr<TypeResolver> resolver_;
 };
 
 TEST_F(JsonUtilTest, TestWhitespaces) {
@@ -158,6 +157,43 @@ TEST_F(JsonUtilTest, TestDefaultValues) {
       "\"repeatedMessageValue\":[]"
       "}",
       ToJson(m, options));
+
+  options.preserve_proto_field_names = true;
+  m.set_string_value("i am a test string value");
+  m.set_bytes_value("i am a test bytes value");
+  EXPECT_EQ(
+      "{\"bool_value\":false,"
+      "\"int32_value\":0,"
+      "\"int64_value\":\"0\","
+      "\"uint32_value\":0,"
+      "\"uint64_value\":\"0\","
+      "\"float_value\":0,"
+      "\"double_value\":0,"
+      "\"string_value\":\"i am a test string value\","
+      "\"bytes_value\":\"aSBhbSBhIHRlc3QgYnl0ZXMgdmFsdWU=\","
+      "\"enum_value\":\"FOO\","
+      "\"repeated_bool_value\":[],"
+      "\"repeated_int32_value\":[],"
+      "\"repeated_int64_value\":[],"
+      "\"repeated_uint32_value\":[],"
+      "\"repeated_uint64_value\":[],"
+      "\"repeated_float_value\":[],"
+      "\"repeated_double_value\":[],"
+      "\"repeated_string_value\":[],"
+      "\"repeated_bytes_value\":[],"
+      "\"repeated_enum_value\":[],"
+      "\"repeated_message_value\":[]"
+      "}",
+      ToJson(m, options));
+}
+
+TEST_F(JsonUtilTest, TestPreserveProtoFieldNames) {
+  TestMessage m;
+  m.mutable_message_value();
+
+  JsonPrintOptions options;
+  options.preserve_proto_field_names = true;
+  EXPECT_EQ("{\"message_value\":{}}", ToJson(m, options));
 }
 
 TEST_F(JsonUtilTest, TestAlwaysPrintEnumsAsInts) {
@@ -169,8 +205,7 @@ TEST_F(JsonUtilTest, TestAlwaysPrintEnumsAsInts) {
   JsonPrintOptions print_options;
   print_options.always_print_enums_as_ints = true;
 
-  string expected_json =
-    "{\"enumValue\":1,\"repeatedEnumValue\":[0,1]}";
+  string expected_json = "{\"enumValue\":1,\"repeatedEnumValue\":[0,1]}";
   EXPECT_EQ(expected_json, ToJson(orig, print_options));
 
   TestMessage parsed;
@@ -183,6 +218,29 @@ TEST_F(JsonUtilTest, TestAlwaysPrintEnumsAsInts) {
   EXPECT_EQ(proto3::BAR, parsed.repeated_enum_value(1));
 }
 
+TEST_F(JsonUtilTest, TestPrintEnumsAsIntsWithDefaultValue) {
+  TestEnumValue orig;
+  //orig.set_enum_value1(proto3::FOO)
+  orig.set_enum_value2(proto3::FOO);
+  orig.set_enum_value3(proto3::BAR);
+
+  JsonPrintOptions print_options;
+  print_options.always_print_enums_as_ints = true;
+  print_options.always_print_primitive_fields = true;
+
+  string expected_json = "{\"enumValue1\":0,\"enumValue2\":0,\"enumValue3\":1}";
+  EXPECT_EQ(expected_json, ToJson(orig, print_options));
+
+  TestEnumValue parsed;
+  JsonParseOptions parse_options;
+  ASSERT_TRUE(FromJson(expected_json, &parsed, parse_options));
+
+  EXPECT_EQ(proto3::FOO, parsed.enum_value1());
+  EXPECT_EQ(proto3::FOO, parsed.enum_value2());
+  EXPECT_EQ(proto3::BAR, parsed.enum_value3());
+
+}
+
 TEST_F(JsonUtilTest, ParseMessage) {
   // Some random message but good enough to verify that the parsing warpper
   // functions are working properly.
@@ -226,12 +284,24 @@ TEST_F(JsonUtilTest, ParsePrimitiveMapIn) {
   JsonPrintOptions print_options;
   print_options.always_print_primitive_fields = true;
   JsonParseOptions parse_options;
-  EXPECT_EQ("{\"other\":\"\",\"things\":[],\"mapInput\":{}}", ToJson(message, print_options));
+  EXPECT_EQ("{\"other\":\"\",\"things\":[],\"mapInput\":{}}",
+            ToJson(message, print_options));
   MapIn other;
   ASSERT_TRUE(FromJson(ToJson(message, print_options), &other, parse_options));
   EXPECT_EQ(message.DebugString(), other.DebugString());
 }
 
+TEST_F(JsonUtilTest, PrintPrimitiveOneof) {
+  TestOneof message;
+  JsonPrintOptions options;
+  options.always_print_primitive_fields = true;
+  message.mutable_oneof_message_value();
+  EXPECT_EQ("{\"oneofMessageValue\":{\"value\":0}}", ToJson(message, options));
+
+  message.set_oneof_int32_value(1);
+  EXPECT_EQ("{\"oneofInt32Value\":1}", ToJson(message, options));
+}
+
 TEST_F(JsonUtilTest, TestParseIgnoreUnknownFields) {
   TestMessage m;
   JsonParseOptions options;
@@ -267,7 +337,7 @@ TEST_F(JsonUtilTest, TestDynamicMessage) {
   DescriptorPool pool(&database);
   // A dynamic version of the test proto.
   DynamicMessageFactory factory;
-  google::protobuf::scoped_ptr<Message> message(factory.GetPrototype(
+  std::unique_ptr<Message> message(factory.GetPrototype(
       pool.FindMessageTypeByName("proto3.TestMessage"))->New());
   EXPECT_TRUE(FromJson(input, message.get()));
 
@@ -287,6 +357,64 @@ TEST_F(JsonUtilTest, TestDynamicMessage) {
   EXPECT_EQ(ToJson(generated, options), ToJson(*message, options));
 }
 
+TEST_F(JsonUtilTest, TestParsingUnknownEnumsAs0) {
+  TestMessage m;
+  {
+    JsonParseOptions options;
+    ASSERT_FALSE(options.ignore_unknown_fields);
+    string input =
+      "{\n"
+      "  \"enum_value\":\"UNKNOWN_VALUE\"\n"
+      "}";
+    m.set_enum_value(proto3::BAR);
+    EXPECT_FALSE(FromJson(input, &m, options));
+    ASSERT_EQ(proto3::BAR, m.enum_value()); // Keep previous value
+
+    options.ignore_unknown_fields = true;
+    EXPECT_TRUE(FromJson(input, &m, options));
+    EXPECT_EQ(0, m.enum_value()); // Unknown enum value must be decoded as 0
+  }
+  // Integer values are read as usual
+  {
+    JsonParseOptions options;
+    string input =
+      "{\n"
+      "  \"enum_value\":12345\n"
+      "}";
+    m.set_enum_value(proto3::BAR);
+    EXPECT_TRUE(FromJson(input, &m, options));
+    ASSERT_EQ(12345, m.enum_value());
+
+    options.ignore_unknown_fields = true;
+    EXPECT_TRUE(FromJson(input, &m, options));
+    EXPECT_EQ(12345, m.enum_value());
+  }
+
+  // Trying to pass an object as an enum field value is always treated as an error
+  {
+    JsonParseOptions options;
+    string input =
+      "{\n"
+      "  \"enum_value\":{}\n"
+      "}";
+    options.ignore_unknown_fields = true;
+    EXPECT_FALSE(FromJson(input, &m, options));
+    options.ignore_unknown_fields = false;
+    EXPECT_FALSE(FromJson(input, &m, options));
+  }
+  // Trying to pass an array as an enum field value is always treated as an error
+  {
+    JsonParseOptions options;
+    string input =
+      "{\n"
+      "  \"enum_value\":[]\n"
+      "}";
+    EXPECT_FALSE(FromJson(input, &m, options));
+    options.ignore_unknown_fields = true;
+    EXPECT_FALSE(FromJson(input, &m, options));
+  }
+}
+
 typedef std::pair<char*, int> Segment;
 // A ZeroCopyOutputStream that writes to multiple buffers.
 class SegmentedZeroCopyOutputStream : public io::ZeroCopyOutputStream {
@@ -412,6 +540,25 @@ TEST(ZeroCopyStreamByteSinkTest, TestAllInputOutputPatterns) {
   }
 }
 
+TEST_F(JsonUtilTest, TestWrongJsonInput) {
+  const char json[] = "{\"unknown_field\":\"some_value\"}";
+  io::ArrayInputStream input_stream(json, strlen(json));
+  char proto_buffer[10000];
+  io::ArrayOutputStream output_stream(proto_buffer, sizeof(proto_buffer));
+  std::string message_type = "type.googleapis.com/proto3.TestMessage";
+  TypeResolver* resolver = NewTypeResolverForDescriptorPool(
+      "type.googleapis.com", DescriptorPool::generated_pool());
+
+  auto result_status = util::JsonToBinaryStream(
+      resolver, message_type, &input_stream, &output_stream);
+
+  delete resolver;
+
+  EXPECT_FALSE(result_status.ok());
+  EXPECT_EQ(result_status.error_code(),
+            util::error::INVALID_ARGUMENT);
+}
+
 }  // namespace
 }  // namespace util
 }  // namespace protobuf
diff --git a/src/google/protobuf/util/message_differencer.cc b/src/google/protobuf/util/message_differencer.cc
index 203d8388..9842f64c 100644
--- a/src/google/protobuf/util/message_differencer.cc
+++ b/src/google/protobuf/util/message_differencer.cc
@@ -40,9 +40,6 @@
 
 #include <algorithm>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <utility>
 
 #include <google/protobuf/stubs/callback.h>
@@ -53,6 +50,7 @@
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/dynamic_message.h>
 #include <google/protobuf/text_format.h>
 #include <google/protobuf/util/field_comparator.h>
@@ -150,6 +148,32 @@ class MessageDifferencer::MultipleFieldsMapKeyComparator
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MultipleFieldsMapKeyComparator);
 };
 
+MessageDifferencer::MapEntryKeyComparator::MapEntryKeyComparator(
+    MessageDifferencer* message_differencer)
+    : message_differencer_(message_differencer) {}
+
+bool MessageDifferencer::MapEntryKeyComparator::IsMatch(
+    const Message& message1, const Message& message2,
+    const std::vector<SpecificField>& parent_fields) const {
+  // Map entry has its key in the field with tag 1.  See the comment for
+  // map_entry in MessageOptions.
+  const FieldDescriptor* key = message1.GetDescriptor()->FindFieldByNumber(1);
+  // If key is not present in message1 and we're doing partial comparison or if
+  // map key is explicitly ignored treat the field as set instead,
+  const bool treat_as_set =
+      (message_differencer_->scope() == PARTIAL &&
+       !message1.GetReflection()->HasField(message1, key)) ||
+      message_differencer_->IsIgnored(message1, message2, key, parent_fields);
+
+  std::vector<SpecificField> current_parent_fields(parent_fields);
+  if (treat_as_set) {
+    return message_differencer_->Compare(message1, message2,
+                                         &current_parent_fields);
+  }
+  return message_differencer_->CompareFieldValueUsingParentFields(
+      message1, message2, key, -1, -1, &current_parent_fields);
+}
+
 bool MessageDifferencer::Equals(const Message& message1,
                                 const Message& message2) {
   MessageDifferencer differencer;
@@ -191,8 +215,10 @@ MessageDifferencer::MessageDifferencer()
       message_field_comparison_(EQUAL),
       scope_(FULL),
       repeated_field_comparison_(AS_LIST),
+      map_entry_key_comparator_(this),
       report_matches_(false),
-      output_string_(NULL) { }
+      report_moves_(true),
+      output_string_(NULL) {}
 
 MessageDifferencer::~MessageDifferencer() {
   for (int i = 0; i < owned_key_comparators_.size(); ++i) {
@@ -334,9 +360,6 @@ void MessageDifferencer::TreatAsMapUsingKeyComparator(
     const MapKeyComparator* key_comparator) {
   GOOGLE_CHECK(field->is_repeated()) << "Field must be repeated: "
                                << field->full_name();
-  GOOGLE_CHECK_EQ(FieldDescriptor::CPPTYPE_MESSAGE, field->cpp_type())
-      << "Field has to be message type.  Field name is: "
-      << field->full_name();
   GOOGLE_CHECK(set_fields_.find(field) == set_fields_.end())
       << "Cannot treat this repeated field as both Map and Set for "
       << "comparison.";
@@ -464,9 +487,13 @@ bool MessageDifferencer::Compare(
   }
   // Expand google.protobuf.Any payload if possible.
   if (descriptor1->full_name() == internal::kAnyFullTypeName) {
-    google::protobuf::scoped_ptr<Message> data1;
-    google::protobuf::scoped_ptr<Message> data2;
+    std::unique_ptr<Message> data1;
+    std::unique_ptr<Message> data2;
     if (UnpackAny(message1, &data1) && UnpackAny(message2, &data2)) {
+      // Avoid DFATAL for different descriptors in google.protobuf.Any payloads.
+      if (data1->GetDescriptor() != data2->GetDescriptor()) {
+        return false;
+      }
       return Compare(*data1, *data2, parent_fields);
     }
   }
@@ -480,8 +507,22 @@ bool MessageDifferencer::Compare(
   std::vector<const FieldDescriptor*> message2_fields;
   message2_fields.reserve(1 + message2.GetDescriptor()->field_count());
 
-  reflection1->ListFields(message1, &message1_fields);
-  reflection2->ListFields(message2, &message2_fields);
+  if (descriptor1->options().map_entry()) {
+    if (scope_ == PARTIAL) {
+      reflection1->ListFields(message1, &message1_fields);
+    } else {
+      // Map entry fields are always considered present.
+      for (int i = 0; i < descriptor1->field_count(); i++) {
+        message1_fields.push_back(descriptor1->field(i));
+      }
+    }
+    for (int i = 0; i < descriptor1->field_count(); i++) {
+      message2_fields.push_back(descriptor1->field(i));
+    }
+  } else {
+    reflection1->ListFields(message1, &message1_fields);
+    reflection2->ListFields(message2, &message2_fields);
+  }
 
   // Add sentinel values to deal with the
   // case where the number of the fields in
@@ -779,6 +820,8 @@ bool MessageDifferencer::IsMatch(
         reflection2->GetRepeatedMessage(*message2, repeated_field, index2);
     SpecificField specific_field;
     specific_field.field = repeated_field;
+    specific_field.index = index1;
+    specific_field.new_index = index2;
     current_parent_fields.push_back(specific_field);
     match = key_comparator->IsMatch(m1, m2, current_parent_fields);
   }
@@ -849,7 +892,8 @@ bool MessageDifferencer::CompareRepeatedField(
       parent_fields->pop_back();
       fieldDifferent = true;
     } else if (reporter_ != NULL &&
-               specific_field.index != specific_field.new_index) {
+               specific_field.index != specific_field.new_index &&
+               !specific_field.field->is_map() && report_moves_) {
       parent_fields->push_back(specific_field);
       reporter_->ReportMoved(message1, message2, *parent_fields);
       parent_fields->pop_back();
@@ -940,6 +984,8 @@ bool MessageDifferencer::CompareFieldValueUsingParentFields(
 bool MessageDifferencer::CheckPathChanged(
     const std::vector<SpecificField>& field_path) {
   for (int i = 0; i < field_path.size(); ++i) {
+    // Don't check indexes for map entries -- maps are unordered.
+    if (field_path[i].field != NULL && field_path[i].field->is_map()) continue;
     if (field_path[i].index != field_path[i].new_index) return true;
   }
   return false;
@@ -947,7 +993,6 @@ bool MessageDifferencer::CheckPathChanged(
 
 bool MessageDifferencer::IsTreatedAsSet(const FieldDescriptor* field) {
   if (!field->is_repeated()) return false;
-  if (field->is_map()) return true;
   if (repeated_field_comparison_ == AS_SET)
     return list_fields_.find(field) == list_fields_.end();
   return (set_fields_.find(field) != set_fields_.end());
@@ -988,12 +1033,18 @@ bool MessageDifferencer::IsUnknownFieldIgnored(
   return false;
 }
 
-const MessageDifferencer::MapKeyComparator* MessageDifferencer
-    ::GetMapKeyComparator(const FieldDescriptor* field) {
+const MessageDifferencer::MapKeyComparator*
+MessageDifferencer ::GetMapKeyComparator(const FieldDescriptor* field) const {
   if (!field->is_repeated()) return NULL;
-  if (map_field_key_comparator_.find(field) !=
-      map_field_key_comparator_.end()) {
-    return map_field_key_comparator_[field];
+  FieldKeyComparatorMap::const_iterator it =
+      map_field_key_comparator_.find(field);
+  if (it != map_field_key_comparator_.end()) {
+    return it->second;
+  }
+  if (field->is_map()) {
+    // field cannot already be treated as list or set since TreatAsList() and
+    // TreatAsSet() call GetMapKeyComparator() and fail if it returns non-NULL.
+    return &map_entry_key_comparator_;
   }
   return NULL;
 }
@@ -1014,7 +1065,7 @@ struct UnknownFieldOrdering {
 }  // namespace
 
 bool MessageDifferencer::UnpackAny(const Message& any,
-                                   google::protobuf::scoped_ptr<Message>* data) {
+                                   std::unique_ptr<Message>* data) {
   const Reflection* reflection = any.GetReflection();
   const FieldDescriptor* type_url_field;
   const FieldDescriptor* value_field;
@@ -1287,7 +1338,7 @@ class MaximumMatcher {
 
   int count1_;
   int count2_;
-  google::protobuf::scoped_ptr<NodeMatchCallback> match_callback_;
+  std::unique_ptr<NodeMatchCallback> match_callback_;
   std::map<std::pair<int, int>, bool> cached_match_results_;
   std::vector<int>* match_list1_;
   std::vector<int>* match_list2_;
@@ -1383,9 +1434,6 @@ bool MessageDifferencer::MatchRepeatedFieldIndices(
   match_list1->assign(count1, -1);
   match_list2->assign(count2, -1);
 
-  SpecificField specific_field;
-  specific_field.field = repeated_field;
-
   bool success = true;
   // Find potential match if this is a special repeated field.
   if (key_comparator != NULL || IsTreatedAsSet(repeated_field)) {
@@ -1395,7 +1443,7 @@ bool MessageDifferencer::MatchRepeatedFieldIndices(
       // algorithm will fail to find a maximum matching.
       // Here we use the argumenting path algorithm.
       MaximumMatcher::NodeMatchCallback* callback =
-          NewPermanentCallback(
+          ::google::protobuf::NewPermanentCallback(
               this, &MessageDifferencer::IsMatch,
               repeated_field, key_comparator,
               &message1, &message2, parent_fields);
@@ -1408,24 +1456,35 @@ bool MessageDifferencer::MatchRepeatedFieldIndices(
       if (match_count != count1 && reporter_ == NULL) return false;
       success = success && (match_count == count1);
     } else {
-      for (int i = 0; i < count1; ++i) {
+      int start_offset = 0;
+      // If the two repeated fields are treated as sets, optimize for the case
+      // where both start with same items stored in the same order.
+      if (IsTreatedAsSet(repeated_field)) {
+        start_offset = std::min(count1, count2);
+        for (int i = 0; i < count1 && i < count2; i++) {
+          if (IsMatch(repeated_field, key_comparator, &message1, &message2,
+                      parent_fields, i, i)) {
+            match_list1->at(i) = i;
+            match_list2->at(i) = i;
+          } else {
+            start_offset = i;
+            break;
+          }
+        }
+      }
+      for (int i = start_offset; i < count1; ++i) {
         // Indicates any matched elements for this repeated field.
         bool match = false;
 
-        specific_field.index = i;
-        specific_field.new_index = i;
-
-        for (int j = 0; j < count2; j++) {
+        for (int j = start_offset; j < count2; j++) {
           if (match_list2->at(j) != -1) continue;
-          specific_field.index = i;
-          specific_field.new_index = j;
 
           match = IsMatch(repeated_field, key_comparator,
                           &message1, &message2, parent_fields, i, j);
 
           if (match) {
-            match_list1->at(specific_field.index) = specific_field.new_index;
-            match_list2->at(specific_field.new_index) = specific_field.index;
+            match_list1->at(i) = j;
+            match_list2->at(j) = i;
             break;
           }
         }
@@ -1503,6 +1562,10 @@ void MessageDifferencer::StreamReporter::PrintPath(
       } else {
         printer_->PrintRaw(specific_field.field->name());
       }
+      if (specific_field.field->is_map()) {
+        // Don't print index in a map field; they are semantically unordered.
+        continue;
+      }
     } else {
       printer_->PrintRaw(SimpleItoa(specific_field.unknown_field_number));
     }
@@ -1515,6 +1578,12 @@ void MessageDifferencer::StreamReporter::PrintPath(
   }
 }
 
+void MessageDifferencer::StreamReporter::PrintPath(
+    const std::vector<SpecificField>& field_path, bool left_side,
+    const Message& message) {
+  PrintPath(field_path, left_side);
+}
+
 void MessageDifferencer::
 StreamReporter::PrintValue(const Message& message,
                            const std::vector<SpecificField>& field_path,
@@ -1592,7 +1661,7 @@ void MessageDifferencer::StreamReporter::ReportAdded(
     const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("added: ");
-  PrintPath(field_path, false);
+  PrintPath(field_path, false, message2);
   printer_->Print(": ");
   PrintValue(message2, field_path, false);
   printer_->Print("\n");  // Print for newlines.
@@ -1603,7 +1672,7 @@ void MessageDifferencer::StreamReporter::ReportDeleted(
     const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("deleted: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   printer_->Print(": ");
   PrintValue(message1, field_path, true);
   printer_->Print("\n");  // Print for newlines
@@ -1627,10 +1696,10 @@ void MessageDifferencer::StreamReporter::ReportModified(
   }
 
   printer_->Print("modified: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   if (CheckPathChanged(field_path)) {
     printer_->Print(" -> ");
-    PrintPath(field_path, false);
+    PrintPath(field_path, false, message2);
   }
   printer_->Print(": ");
   PrintValue(message1, field_path, true);
@@ -1644,9 +1713,9 @@ void MessageDifferencer::StreamReporter::ReportMoved(
     const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("moved: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   printer_->Print(" -> ");
-  PrintPath(field_path, false);
+  PrintPath(field_path, false, message2);
   printer_->Print(" : ");
   PrintValue(message1, field_path, true);
   printer_->Print("\n");  // Print for newlines.
@@ -1657,10 +1726,10 @@ void MessageDifferencer::StreamReporter::ReportMatched(
     const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("matched: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   if (CheckPathChanged(field_path)) {
     printer_->Print(" -> ");
-    PrintPath(field_path, false);
+    PrintPath(field_path, false, message2);
   }
   printer_->Print(" : ");
   PrintValue(message1, field_path, true);
@@ -1672,10 +1741,10 @@ void MessageDifferencer::StreamReporter::ReportIgnored(
     const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("ignored: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   if (CheckPathChanged(field_path)) {
     printer_->Print(" -> ");
-    PrintPath(field_path, false);
+    PrintPath(field_path, false, message2);
   }
   printer_->Print("\n");  // Print for newlines.
 }
@@ -1684,14 +1753,21 @@ void MessageDifferencer::StreamReporter::ReportUnknownFieldIgnored(
     const Message& message1, const Message& message2,
     const std::vector<SpecificField>& field_path) {
   printer_->Print("ignored: ");
-  PrintPath(field_path, true);
+  PrintPath(field_path, true, message1);
   if (CheckPathChanged(field_path)) {
     printer_->Print(" -> ");
-    PrintPath(field_path, false);
+    PrintPath(field_path, false, message2);
   }
   printer_->Print("\n");  // Print for newlines.
 }
 
+MessageDifferencer::MapKeyComparator*
+MessageDifferencer::CreateMultipleFieldsMapKeyComparator(
+    const std::vector<std::vector<const FieldDescriptor*> >& key_field_paths) {
+  return new MultipleFieldsMapKeyComparator(this, key_field_paths);
+}
+
+
 }  // namespace util
 }  // namespace protobuf
 }  // namespace google
diff --git a/src/google/protobuf/util/message_differencer.h b/src/google/protobuf/util/message_differencer.h
index d99223cb..bbcf8498 100644
--- a/src/google/protobuf/util/message_differencer.h
+++ b/src/google/protobuf/util/message_differencer.h
@@ -64,6 +64,7 @@ class Printer;
 
 namespace util {
 
+class DefaultFieldComparator;
 class FieldContext;  // declared below MessageDifferencer
 
 // A basic differencer that can be used to determine
@@ -174,10 +175,8 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
 
     // If "field" is a repeated field which is being treated as a map or
     // a set (see TreatAsMap() and TreatAsSet(), below), new_index indicates
-    // the index the position to which the element has moved.  This only
-    // applies to ReportMoved() and (in the case of TreatAsMap())
-    // ReportModified().  In all other cases, "new_index" will have the same
-    // value as "index".
+    // the index the position to which the element has moved.  If the element
+    // has not moved, "new_index" will have the same value as "index".
     int new_index;
 
     // For unknown fields, these are the pointers to the UnknownFieldSet
@@ -241,18 +240,18 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
     // mutually exclusive. If a field has been both moved and modified, then
     // only ReportModified will be called.
     virtual void ReportMoved(
-        const Message& message1,
-        const Message& message2,
-        const std::vector<SpecificField>& field_path) { }
+        const Message& /* message1 */,
+        const Message& /* message2 */,
+        const std::vector<SpecificField>& /* field_path */) { }
 
     // Reports that two fields match. Useful for doing side-by-side diffs.
     // This function is mutually exclusive with ReportModified and ReportMoved.
     // Note that you must call set_report_matches(true) before calling Compare
     // to make use of this function.
     virtual void ReportMatched(
-        const Message& message1,
-        const Message& message2,
-        const std::vector<SpecificField>& field_path) { }
+        const Message& /* message1 */,
+        const Message& /* message2 */,
+        const std::vector<SpecificField>& /* field_path */) { }
 
     // Reports that two fields would have been compared, but the
     // comparison has been skipped because the field was marked as
@@ -274,16 +273,16 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
     // the fields are equal or not (perhaps with a second call to
     // Compare()), if it cares.
     virtual void ReportIgnored(
-        const Message& message1,
-        const Message& message2,
-        const std::vector<SpecificField>& field_path) { }
+        const Message& /* message1 */,
+        const Message& /* message2 */,
+        const std::vector<SpecificField>& /* field_path */) { }
 
     // Report that an unknown field is ignored. (see comment above).
     // Note this is a different function since the last SpecificField in field
     // path has a null field.  This could break existing Reporter.
     virtual void ReportUnknownFieldIgnored(
-        const Message& message1, const Message& message2,
-        const std::vector<SpecificField>& field_path) {}
+        const Message& /* message1 */, const Message& /* message2 */,
+        const std::vector<SpecificField>& /* field_path */) {}
 
    private:
     GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Reporter);
@@ -297,9 +296,9 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
     virtual ~MapKeyComparator();
 
     virtual bool IsMatch(
-        const Message& message1,
-        const Message& message2,
-        const std::vector<SpecificField>& parent_fields) const {
+        const Message& /* message1 */,
+        const Message& /* message2 */,
+        const std::vector<SpecificField>& /* parent_fields */) const {
       GOOGLE_CHECK(false) << "IsMatch() is not implemented.";
       return false;
     }
@@ -321,18 +320,18 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
 
     // Returns true if the field should be ignored.
     virtual bool IsIgnored(
-        const Message& message1,
-        const Message& message2,
-        const FieldDescriptor* field,
-        const std::vector<SpecificField>& parent_fields) = 0;
+        const Message& /* message1 */,
+        const Message& /* message2 */,
+        const FieldDescriptor* /* field */,
+        const std::vector<SpecificField>& /* parent_fields */) = 0;
 
     // Returns true if the unknown field should be ignored.
     // Note: This will be called for unknown fields as well in which case
     //       field.field will be null.
     virtual bool IsUnknownFieldIgnored(
-        const Message& message1, const Message& message2,
-        const SpecificField& field,
-        const std::vector<SpecificField>& parent_fields) {
+        const Message& /* message1 */, const Message& /* message2 */,
+        const SpecificField& /* field */,
+        const std::vector<SpecificField>& /* parent_fields */) {
       return false;
     }
   };
@@ -372,7 +371,7 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
                  // repeated fields have different numbers of elements, the
                  // unpaired elements are reported using ReportAdded() or
                  // ReportDeleted().
-    AS_SET,      // Treat all the repeated fields as sets by default.
+    AS_SET,      // Treat all the repeated fields as sets.
                  // See TreatAsSet(), as below.
   };
 
@@ -386,6 +385,11 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
   // the only differences between the compared messages is that some fields
   // have been moved, then the comparison returns true.
   //
+  // Note that despite the name of this method, this is really
+  // comparison as multisets: if one side of the comparison has a duplicate
+  // in the repeated field but the other side doesn't, this will count as
+  // a mismatch.
+  //
   // If the scope of comparison is set to PARTIAL, then in addition to what's
   // above, extra values added to repeated fields of the second message will
   // not cause the comparison to fail.
@@ -470,6 +474,10 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
       const FieldDescriptor* field,
       const MapKeyComparator* key_comparator);
 
+  // Initiates and returns a new instance of MultipleFieldsMapKeyComparator.
+  MapKeyComparator* CreateMultipleFieldsMapKeyComparator(
+      const std::vector<std::vector<const FieldDescriptor*> >& key_field_paths);
+
   // Add a custom ignore criteria that is evaluated in addition to the
   // ignored fields added with IgnoreField.
   // Takes ownership of ignore_criteria.
@@ -518,6 +526,13 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
     report_matches_ = report_matches;
   }
 
+  // Tells the differencer whether or not to report moves (in a set or map
+  // repeated field). This method must be called before Compare. The default for
+  // a new differencer is true.
+  void set_report_moves(bool report_moves) {
+    report_moves_ = report_moves;
+  }
+
   // Sets the scope of the comparison (as defined in the Scope enumeration
   // above) that is used by this differencer when determining which fields to
   // compare between the messages.
@@ -620,6 +635,11 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
         const std::vector<SpecificField>& field_path);
 
    protected:
+    // Prints the specified path of fields to the buffer.  message is used to
+    // print map keys.
+    virtual void PrintPath(const std::vector<SpecificField>& field_path,
+                           bool left_side, const Message& message);
+
     // Prints the specified path of fields to the buffer.
     virtual void PrintPath(const std::vector<SpecificField>& field_path,
                            bool left_side);
@@ -648,11 +668,25 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
   };
 
  private:
+  friend class DefaultFieldComparator;
+
   // A MapKeyComparator to be used in TreatAsMapUsingKeyComparator.
   // Implementation of this class needs to do field value comparison which
   // relies on some private methods of MessageDifferencer. That's why this
   // class is declared as a nested class of MessageDifferencer.
   class MultipleFieldsMapKeyComparator;
+
+  // A MapKeyComparator for use with map_entries.
+  class LIBPROTOBUF_EXPORT MapEntryKeyComparator : public MapKeyComparator {
+   public:
+    explicit MapEntryKeyComparator(MessageDifferencer* message_differencer);
+    virtual bool IsMatch(const Message& message1, const Message& message2,
+                         const std::vector<SpecificField>& parent_fields) const;
+
+   private:
+    MessageDifferencer* message_differencer_;
+  };
+
   // Returns true if field1's number() is less than field2's.
   static bool FieldBefore(const FieldDescriptor* field1,
                           const FieldDescriptor* field2);
@@ -765,9 +799,10 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
                              const SpecificField& field,
                              const std::vector<SpecificField>& parent_fields);
 
-  // Returns MapKeyComparator* when this field has been configured to
-  // be treated as a map.  If not, returns NULL.
-  const MapKeyComparator* GetMapKeyComparator(const FieldDescriptor* field);
+  // Returns MapKeyComparator* when this field has been configured to be treated
+  // as a map or its is_map() return true.  If not, returns NULL.
+  const MapKeyComparator* GetMapKeyComparator(
+      const FieldDescriptor* field) const;
 
   // Attempts to match indices of a repeated field, so that the contained values
   // match. Clears output vectors and sets their values to indices of paired
@@ -786,7 +821,7 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
 
   // If "any" is of type google.protobuf.Any, extract its payload using
   // DynamicMessageFactory and store in "data".
-  bool UnpackAny(const Message& any, google::protobuf::scoped_ptr<Message>* data);
+  bool UnpackAny(const Message& any, std::unique_ptr<Message>* data);
 
   // Checks if index is equal to new_index in all the specific fields.
   static bool CheckPathChanged(const std::vector<SpecificField>& parent_fields);
@@ -817,15 +852,17 @@ class LIBPROTOBUF_EXPORT MessageDifferencer {
   // MapKeyComparator is created for comparison purpose.
   std::vector<MapKeyComparator*> owned_key_comparators_;
   FieldKeyComparatorMap map_field_key_comparator_;
+  MapEntryKeyComparator map_entry_key_comparator_;
   std::vector<IgnoreCriteria*> ignore_criteria_;
 
   FieldSet ignored_fields_;
 
   bool report_matches_;
+  bool report_moves_;
 
   string* output_string_;
 
-  google::protobuf::scoped_ptr<DynamicMessageFactory> dynamic_message_factory_;
+  std::unique_ptr<DynamicMessageFactory> dynamic_message_factory_;
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageDifferencer);
 };
 
diff --git a/src/google/protobuf/util/message_differencer_unittest.cc b/src/google/protobuf/util/message_differencer_unittest.cc
index 30b27dba..a263d983 100755
--- a/src/google/protobuf/util/message_differencer_unittest.cc
+++ b/src/google/protobuf/util/message_differencer_unittest.cc
@@ -38,6 +38,7 @@
 #include <string>
 #include <vector>
 
+#include <google/protobuf/stubs/strutil.h>
 
 #include <google/protobuf/util/field_comparator.h>
 #include <google/protobuf/util/message_differencer.h>
@@ -54,7 +55,6 @@
 
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/testing/googletest.h>
 #include <gtest/gtest.h>
 
@@ -127,6 +127,27 @@ TEST(MessageDifferencerTest, RepeatedFieldInequalityTest) {
   EXPECT_FALSE(util::MessageDifferencer::Equals(msg1, msg2));
 }
 
+TEST(MessageDifferencerTest, RepeatedFieldSetOptimizationTest) {
+  util::MessageDifferencer differencer;
+  protobuf_unittest::TestDiffMessage msg1;
+  protobuf_unittest::TestDiffMessage msg2;
+  protobuf_unittest::TestDiffMessage::Item* item1 = msg1.add_item();
+  protobuf_unittest::TestDiffMessage::Item* item2 = msg2.add_item();
+  differencer.TreatAsSet(item1->GetDescriptor()->FindFieldByName("ra"));
+  differencer.TreatAsSet(item2->GetDescriptor()->FindFieldByName("ra"));
+  for (int i = 0; i < 1000; i++) {
+    item1->add_ra(i);
+    item2->add_ra(i);
+  }
+  EXPECT_TRUE(differencer.Compare(msg1, msg2));
+  item2->add_ra(1001);
+  EXPECT_FALSE(differencer.Compare(msg1, msg2));
+  item1->add_ra(1001);
+  EXPECT_TRUE(differencer.Compare(msg1, msg2));
+  item1->add_ra(1002);
+  EXPECT_FALSE(differencer.Compare(msg1, msg2));
+}
+
 TEST(MessageDifferencerTest, MapFieldEqualityTest) {
   // Create the testing protos
   unittest::TestMap msg1;
@@ -1558,6 +1579,43 @@ TEST(MessageDifferencerTest, RepeatedFieldMapTest_CustomMapKeyComparator) {
   EXPECT_EQ("ignored: item[0].ra\n", output);
 }
 
+// Compares fields by their index offset by one, so index 0 matches with 1, etc.
+class OffsetByOneMapKeyComparator
+    : public util::MessageDifferencer::MapKeyComparator {
+ public:
+  typedef util::MessageDifferencer::SpecificField SpecificField;
+  virtual bool IsMatch(const Message& message1, const Message& message2,
+                       const std::vector<SpecificField>& parent_fields) const {
+    return parent_fields.back().index + 1 == parent_fields.back().new_index;
+  }
+};
+
+TEST(MessageDifferencerTest, RepeatedFieldMapTest_CustomIndexMapKeyComparator) {
+  protobuf_unittest::TestDiffMessage msg1;
+  protobuf_unittest::TestDiffMessage msg2;
+  // Treat "item" as Map, using custom key comparator to determine if two
+  // elements have the same key.
+  protobuf_unittest::TestDiffMessage::Item* item = msg1.add_item();
+  item->set_b("one");
+  item = msg2.add_item();
+  item->set_b("zero");
+  item = msg2.add_item();
+  item->set_b("one");
+  util::MessageDifferencer differencer;
+  OffsetByOneMapKeyComparator key_comparator;
+  differencer.TreatAsMapUsingKeyComparator(GetFieldDescriptor(msg1, "item"),
+                                           &key_comparator);
+  string output;
+  differencer.ReportDifferencesToString(&output);
+  // With the offset by one comparator msg1.item[0] should be compared to
+  // msg2.item[1] and thus be moved, msg2.item[0] should be marked as added.
+  EXPECT_FALSE(differencer.Compare(msg1, msg2));
+  EXPECT_EQ(
+      "moved: item[0] -> item[1] : { b: \"one\" }\n"
+      "added: item[0]: { b: \"zero\" }\n",
+      output);
+}
+
 TEST(MessageDifferencerTest, RepeatedFieldSetTest_Subset) {
   protobuf_unittest::TestDiffMessage msg1;
   protobuf_unittest::TestDiffMessage msg2;
@@ -2042,6 +2100,9 @@ class ComparisonTest : public testing::Test {
   unittest::TestEmptyMessage empty1_;
   unittest::TestEmptyMessage empty2_;
 
+  unittest::TestMap map_proto1_;
+  unittest::TestMap map_proto2_;
+
   UnknownFieldSet* unknown1_;
   UnknownFieldSet* unknown2_;
 
@@ -2802,6 +2863,133 @@ TEST_F(ComparisonTest, EquivalentIgnoresUnknown) {
   EXPECT_TRUE(util::MessageDifferencer::Equivalent(message1, message2));
 }
 
+TEST_F(ComparisonTest, MapTest) {
+  Map<string, string>& map1 = *map_proto1_.mutable_map_string_string();
+  map1["key1"] = "1";
+  map1["key2"] = "2";
+  map1["key3"] = "3";
+  Map<string, string>& map2 = *map_proto2_.mutable_map_string_string();
+  map2["key3"] = "0";
+  map2["key2"] = "2";
+  map2["key1"] = "1";
+
+  EXPECT_EQ("modified: map_string_string.value: \"3\" -> \"0\"\n",
+            Run(map_proto1_, map_proto2_));
+}
+
+TEST_F(ComparisonTest, MapIgnoreKeyTest) {
+  Map<string, string>& map1 = *map_proto1_.mutable_map_string_string();
+  map1["key1"] = "1";
+  map1["key2"] = "2";
+  map1["key3"] = "3";
+  Map<string, string>& map2 = *map_proto2_.mutable_map_string_string();
+  map2["key4"] = "2";
+  map2["key5"] = "3";
+  map2["key6"] = "1";
+
+  util::MessageDifferencer differencer;
+  differencer.IgnoreField(
+      GetFieldDescriptor(map_proto1_, "map_string_string.key"));
+  EXPECT_TRUE(differencer.Compare(map_proto1_, map_proto2_));
+}
+
+TEST_F(ComparisonTest, MapRoundTripSyncTest) {
+  google::protobuf::TextFormat::Parser parser;
+  unittest::TestMap map_reflection1;
+
+  // By setting via reflection, data exists in repeated field.
+  ASSERT_TRUE(parser.ParseFromString(
+      "map_int32_foreign_message { key: 1 }", &map_reflection1));
+
+  // During copy, data is synced from repeated field to map.
+  unittest::TestMap map_reflection2 = map_reflection1;
+
+  // During comparison, data is synced from map to repeated field.
+  EXPECT_TRUE(
+      util::MessageDifferencer::Equals(map_reflection1, map_reflection2));
+}
+
+TEST_F(ComparisonTest, MapEntryPartialTest) {
+  google::protobuf::TextFormat::Parser parser;
+  unittest::TestMap map1;
+  unittest::TestMap map2;
+
+  string output;
+  util::MessageDifferencer differencer;
+  differencer.set_scope(util::MessageDifferencer::PARTIAL);
+  differencer.ReportDifferencesToString(&output);
+
+  ASSERT_TRUE(parser.ParseFromString(
+      "map_int32_foreign_message { key: 1 value { c: 1 } }", &map1));
+  ASSERT_TRUE(parser.ParseFromString(
+      "map_int32_foreign_message { key: 1 value { c: 2 }}", &map2));
+  EXPECT_FALSE(differencer.Compare(map1, map2));
+  EXPECT_EQ("modified: map_int32_foreign_message.value.c: 1 -> 2\n", output);
+
+  ASSERT_TRUE(
+      parser.ParseFromString("map_int32_foreign_message { key: 1 }", &map1));
+  EXPECT_TRUE(differencer.Compare(map1, map2));
+}
+
+TEST_F(ComparisonTest, MapEntryPartialEmptyKeyTest) {
+  google::protobuf::TextFormat::Parser parser;
+  unittest::TestMap map1;
+  unittest::TestMap map2;
+  ASSERT_TRUE(parser.ParseFromString("map_int32_foreign_message {}", &map1));
+  ASSERT_TRUE(
+      parser.ParseFromString("map_int32_foreign_message { key: 1 }", &map2));
+
+  util::MessageDifferencer differencer;
+  differencer.set_scope(util::MessageDifferencer::PARTIAL);
+  EXPECT_TRUE(differencer.Compare(map1, map2));
+}
+
+// Considers strings keys as equal if they have equal lengths.
+class LengthMapKeyComparator
+    : public util::MessageDifferencer::MapKeyComparator {
+ public:
+  typedef util::MessageDifferencer::SpecificField SpecificField;
+  virtual bool IsMatch(const Message& message1, const Message& message2,
+                       const std::vector<SpecificField>& parent_fields) const {
+    const Reflection* reflection1 = message1.GetReflection();
+    const Reflection* reflection2 = message2.GetReflection();
+    const FieldDescriptor* key_field =
+        message1.GetDescriptor()->FindFieldByName("key");
+    return reflection1->GetString(message1, key_field).size() ==
+           reflection2->GetString(message2, key_field).size();
+  }
+};
+
+TEST_F(ComparisonTest, MapEntryCustomMapKeyComparator) {
+  google::protobuf::TextFormat::Parser parser;
+  protobuf_unittest::TestMap msg1;
+  protobuf_unittest::TestMap msg2;
+
+  ASSERT_TRUE(parser.ParseFromString(
+      "map_string_foreign_message { key: 'key1' value { c: 1 }}", &msg1));
+  ASSERT_TRUE(parser.ParseFromString(
+      "map_string_foreign_message { key: 'key2' value { c: 1 }}", &msg2));
+
+  util::MessageDifferencer differencer;
+  LengthMapKeyComparator key_comparator;
+  differencer.TreatAsMapUsingKeyComparator(
+      GetFieldDescriptor(msg1, "map_string_foreign_message"), &key_comparator);
+  string output;
+  differencer.ReportDifferencesToString(&output);
+  // Though the above two messages have different keys for their map entries,
+  // they are considered the same by key_comparator because their lengths are
+  // equal.  However, in value comparison, all fields of the message are taken
+  // into consideration, so they are reported as different.
+  EXPECT_FALSE(differencer.Compare(msg1, msg2));
+  EXPECT_EQ("modified: map_string_foreign_message.key: \"key1\" -> \"key2\"\n",
+            output);
+  differencer.IgnoreField(
+      GetFieldDescriptor(msg1, "map_string_foreign_message.key"));
+  output.clear();
+  EXPECT_TRUE(differencer.Compare(msg1, msg2));
+  EXPECT_EQ("ignored: map_string_foreign_message.key\n", output);
+}
+
 class MatchingTest : public testing::Test {
  public:
   typedef util::MessageDifferencer MessageDifferencer;
@@ -3146,6 +3334,24 @@ TEST(Anytest, TreatAsSet) {
   EXPECT_TRUE(message_differencer.Compare(m1, m2));
 }
 
+TEST(Anytest, TreatAsSet_DifferentType) {
+  protobuf_unittest::TestField value1;
+  value1.set_a(20);
+  value1.set_b(30);
+  protobuf_unittest::TestDiffMessage value2;
+  value2.add_rv(40);
+
+  protobuf_unittest::TestAny m1, m2;
+  m1.add_repeated_any_value()->PackFrom(value1);
+  m1.add_repeated_any_value()->PackFrom(value2);
+  m2.add_repeated_any_value()->PackFrom(value2);
+  m2.add_repeated_any_value()->PackFrom(value1);
+
+  util::MessageDifferencer message_differencer;
+  message_differencer.TreatAsSet(GetFieldDescriptor(m1, "repeated_any_value"));
+  EXPECT_TRUE(message_differencer.Compare(m1, m2));
+}
+
 
 }  // namespace
 }  // namespace protobuf
diff --git a/src/google/protobuf/util/package_info.h b/src/google/protobuf/util/package_info.h
index e37e6dc0..96019203 100644
--- a/src/google/protobuf/util/package_info.h
+++ b/src/google/protobuf/util/package_info.h
@@ -38,7 +38,7 @@ namespace protobuf {
 
 // Utility classes.
 //
-// This package contains various utilities for message comprasion, JSON
+// This package contains various utilities for message comparison, JSON
 // conversion, well known types, etc.
 namespace util {}
 
diff --git a/src/google/protobuf/util/time_util.cc b/src/google/protobuf/util/time_util.cc
index b11f822a..d4912837 100644
--- a/src/google/protobuf/util/time_util.cc
+++ b/src/google/protobuf/util/time_util.cc
@@ -30,13 +30,14 @@
 
 #include <google/protobuf/util/time_util.h>
 
-#include <google/protobuf/stubs/time.h>
 #include <google/protobuf/stubs/int128.h>
-#include <google/protobuf/stubs/strutil.h>
 #include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/time.h>
 #include <google/protobuf/duration.pb.h>
 #include <google/protobuf/timestamp.pb.h>
 
+
 namespace google {
 namespace protobuf {
 namespace util {
@@ -49,11 +50,9 @@ static const int kNanosPerSecond = 1000000000;
 static const int kMicrosPerSecond = 1000000;
 static const int kMillisPerSecond = 1000;
 static const int kNanosPerMillisecond = 1000000;
-static const int kMicrosPerMillisecond = 1000;
 static const int kNanosPerMicrosecond = 1000;
 static const int kSecondsPerMinute = 60;  // Note that we ignore leap seconds.
 static const int kSecondsPerHour = 3600;
-static const char kTimestampFormat[] = "%E4Y-%m-%dT%H:%M:%S";
 
 template <typename T>
 T CreateNormalized(int64 seconds, int64 nanos);
@@ -376,19 +375,6 @@ namespace {
 using google::protobuf::util::kNanosPerSecond;
 using google::protobuf::util::CreateNormalized;
 
-// Convert a Timestamp to uint128.
-void ToUint128(const Timestamp& value, uint128* result, bool* negative) {
-  if (value.seconds() < 0) {
-    *negative = true;
-    *result = static_cast<uint64>(-value.seconds());
-    *result = *result * kNanosPerSecond - static_cast<uint32>(value.nanos());
-  } else {
-    *negative = false;
-    *result = static_cast<uint64>(value.seconds());
-    *result = *result * kNanosPerSecond + static_cast<uint32>(value.nanos());
-  }
-}
-
 // Convert a Duration to uint128.
 void ToUint128(const Duration& value, uint128* result, bool* negative) {
   if (value.seconds() < 0 || value.nanos() < 0) {
@@ -402,21 +388,6 @@ void ToUint128(const Duration& value, uint128* result, bool* negative) {
   }
 }
 
-void ToTimestamp(const uint128& value, bool negative, Timestamp* timestamp) {
-  int64 seconds = static_cast<int64>(Uint128Low64(value / kNanosPerSecond));
-  int32 nanos = static_cast<int32>(Uint128Low64(value % kNanosPerSecond));
-  if (negative) {
-    seconds = -seconds;
-    nanos = -nanos;
-    if (nanos < 0) {
-      nanos += kNanosPerSecond;
-      seconds -= 1;
-    }
-  }
-  timestamp->set_seconds(seconds);
-  timestamp->set_nanos(nanos);
-}
-
 void ToDuration(const uint128& value, bool negative, Duration* duration) {
   int64 seconds = static_cast<int64>(Uint128Low64(value / kNanosPerSecond));
   int32 nanos = static_cast<int32>(Uint128Low64(value % kNanosPerSecond));
diff --git a/src/google/protobuf/util/type_resolver_util.cc b/src/google/protobuf/util/type_resolver_util.cc
index febaa41f..a69ed58c 100644
--- a/src/google/protobuf/util/type_resolver_util.cc
+++ b/src/google/protobuf/util/type_resolver_util.cc
@@ -95,11 +95,6 @@ class DescriptorPoolTypeResolver : public TypeResolver {
     type->Clear();
     type->set_name(descriptor->full_name());
     for (int i = 0; i < descriptor->field_count(); ++i) {
-      const FieldDescriptor* field = descriptor->field(i);
-      if (field->type() == FieldDescriptor::TYPE_GROUP) {
-        // Group fields cannot be represented with Type. We discard them.
-        continue;
-      }
       ConvertFieldDescriptor(descriptor->field(i), type->add_fields());
     }
     for (int i = 0; i < descriptor->oneof_decl_count(); ++i) {
@@ -141,7 +136,8 @@ class DescriptorPoolTypeResolver : public TypeResolver {
     if (descriptor->has_default_value()) {
       field->set_default_value(DefaultValueAsString(descriptor));
     }
-    if (descriptor->type() == FieldDescriptor::TYPE_MESSAGE) {
+    if (descriptor->type() == FieldDescriptor::TYPE_MESSAGE ||
+        descriptor->type() == FieldDescriptor::TYPE_GROUP) {
       field->set_type_url(GetTypeUrl(descriptor->message_type()));
     } else if (descriptor->type() == FieldDescriptor::TYPE_ENUM) {
       field->set_type_url(GetTypeUrl(descriptor->enum_type()));
diff --git a/src/google/protobuf/util/type_resolver_util_test.cc b/src/google/protobuf/util/type_resolver_util_test.cc
index 8a0bf652..9dea17ae 100644
--- a/src/google/protobuf/util/type_resolver_util_test.cc
+++ b/src/google/protobuf/util/type_resolver_util_test.cc
@@ -32,9 +32,6 @@
 
 #include <limits>
 #include <memory>
-#ifndef _SHARED_PTR_H
-#include <google/protobuf/stubs/shared_ptr.h>
-#endif
 #include <string>
 #include <vector>
 
@@ -153,7 +150,7 @@ class DescriptorPoolTypeResolverTest : public testing::Test {
   }
 
  protected:
-  google::protobuf::scoped_ptr<TypeResolver> resolver_;
+  std::unique_ptr<TypeResolver> resolver_;
 };
 
 TEST_F(DescriptorPoolTypeResolverTest, TestAllTypes) {
@@ -193,6 +190,13 @@ TEST_F(DescriptorPoolTypeResolverTest, TestAllTypes) {
                        Field::TYPE_BYTES, "optional_bytes", 15));
 
   EXPECT_TRUE(HasField(type, Field::CARDINALITY_OPTIONAL,
+                       Field::TYPE_GROUP, "optionalgroup", 16));
+
+  EXPECT_TRUE(CheckFieldTypeUrl(
+      type, "optionalgroup",
+      GetTypeUrl<protobuf_unittest::TestAllTypes::OptionalGroup>()));
+
+  EXPECT_TRUE(HasField(type, Field::CARDINALITY_OPTIONAL,
                        Field::TYPE_MESSAGE, "optional_nested_message", 18));
   EXPECT_TRUE(HasField(type, Field::CARDINALITY_OPTIONAL,
                        Field::TYPE_MESSAGE, "optional_foreign_message", 19));
@@ -249,6 +253,13 @@ TEST_F(DescriptorPoolTypeResolverTest, TestAllTypes) {
                        Field::TYPE_BYTES, "repeated_bytes", 45));
 
   EXPECT_TRUE(HasField(type, Field::CARDINALITY_REPEATED,
+                       Field::TYPE_GROUP, "repeatedgroup", 46));
+
+  EXPECT_TRUE(CheckFieldTypeUrl(
+      type, "repeatedgroup",
+      GetTypeUrl<protobuf_unittest::TestAllTypes::RepeatedGroup>()));
+
+  EXPECT_TRUE(HasField(type, Field::CARDINALITY_REPEATED,
                        Field::TYPE_MESSAGE, "repeated_nested_message", 48));
   EXPECT_TRUE(HasField(type, Field::CARDINALITY_REPEATED,
                        Field::TYPE_MESSAGE, "repeated_foreign_message", 49));
@@ -271,13 +282,6 @@ TEST_F(DescriptorPoolTypeResolverTest, TestAllTypes) {
   EXPECT_TRUE(CheckFieldTypeUrl(
       type, "repeated_foreign_enum",
       GetTypeUrl("protobuf_unittest.ForeignEnum")));
-
-  // Groups are discarded when converting to Type.
-  const Descriptor* descriptor = protobuf_unittest::TestAllTypes::descriptor();
-  EXPECT_TRUE(descriptor->FindFieldByName("optionalgroup") != NULL);
-  EXPECT_TRUE(descriptor->FindFieldByName("repeatedgroup") != NULL);
-  ASSERT_FALSE(HasField(type, "optionalgroup"));
-  ASSERT_FALSE(HasField(type, "repeatedgroup"));
 }
 
 TEST_F(DescriptorPoolTypeResolverTest, TestPackedField) {
diff --git a/src/google/protobuf/wire_format.cc b/src/google/protobuf/wire_format.cc
index bd5b2489..3fdf84ed 100644
--- a/src/google/protobuf/wire_format.cc
+++ b/src/google/protobuf/wire_format.cc
@@ -41,22 +41,29 @@
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/stringprintf.h>
-#include <google/protobuf/descriptor.h>
-#include <google/protobuf/dynamic_message.h>
-#include <google/protobuf/map_field.h>
-#include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/io/zero_copy_stream.h>
 #include <google/protobuf/io/zero_copy_stream_impl.h>
+#include <google/protobuf/descriptor.h>
+#include <google/protobuf/dynamic_message.h>
+#include <google/protobuf/map_field.h>
 #include <google/protobuf/unknown_field_set.h>
-
+#include <google/protobuf/wire_format_lite_inl.h>
 
 
 namespace google {
+const size_t kMapEntryTagByteSize = 2;
+
 namespace protobuf {
 namespace internal {
 
+// Forward declare static functions
+static size_t MapKeyDataOnlyByteSize(const FieldDescriptor* field,
+                                     const MapKey& value);
+static size_t MapValueRefDataOnlyByteSize(const FieldDescriptor* field,
+                                          const MapValueRef& value);
+
 // ===================================================================
 
 bool UnknownFieldSetFieldSkipper::SkipField(
@@ -76,6 +83,8 @@ void UnknownFieldSetFieldSkipper::SkipUnknownEnum(
 bool WireFormat::SkipField(io::CodedInputStream* input, uint32 tag,
                            UnknownFieldSet* unknown_fields) {
   int number = WireFormatLite::GetTagFieldNumber(tag);
+  // Field number 0 is illegal.
+  if (number == 0) return false;
 
   switch (WireFormatLite::GetTagWireType(tag)) {
     case WireFormatLite::WIRETYPE_VARINT: {
@@ -795,7 +804,16 @@ void WireFormat::SerializeWithCachedSizes(
   int expected_endpoint = output->ByteCount() + size;
 
   std::vector<const FieldDescriptor*> fields;
-  message_reflection->ListFields(message, &fields);
+
+  // Fields of map entry should always be serialized.
+  if (descriptor->options().map_entry()) {
+    for (int i = 0; i < descriptor->field_count(); i++) {
+      fields.push_back(descriptor->field(i));
+    }
+  } else {
+    message_reflection->ListFields(message, &fields);
+  }
+
   for (int i = 0; i < fields.size(); i++) {
     SerializeFieldWithCachedSizes(fields[i], message, output);
   }
@@ -814,6 +832,129 @@ void WireFormat::SerializeWithCachedSizes(
        "during serialization?";
 }
 
+static void SerializeMapKeyWithCachedSizes(const FieldDescriptor* field,
+                                           const MapKey& value,
+                                           io::CodedOutputStream* output) {
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_DOUBLE:
+    case FieldDescriptor::TYPE_FLOAT:
+    case FieldDescriptor::TYPE_GROUP:
+    case FieldDescriptor::TYPE_MESSAGE:
+    case FieldDescriptor::TYPE_BYTES:
+    case FieldDescriptor::TYPE_ENUM:
+      GOOGLE_LOG(FATAL) << "Unsupported";
+      break;
+#define CASE_TYPE(FieldType, CamelFieldType, CamelCppType)                     \
+  case FieldDescriptor::TYPE_##FieldType:                                      \
+    WireFormatLite::Write##CamelFieldType(1, value.Get##CamelCppType##Value(), \
+                                          output);                             \
+    break;
+      CASE_TYPE(INT64, Int64, Int64)
+      CASE_TYPE(UINT64, UInt64, UInt64)
+      CASE_TYPE(INT32, Int32, Int32)
+      CASE_TYPE(FIXED64, Fixed64, UInt64)
+      CASE_TYPE(FIXED32, Fixed32, UInt32)
+      CASE_TYPE(BOOL, Bool, Bool)
+      CASE_TYPE(UINT32, UInt32, UInt32)
+      CASE_TYPE(SFIXED32, SFixed32, Int32)
+      CASE_TYPE(SFIXED64, SFixed64, Int64)
+      CASE_TYPE(SINT32, SInt32, Int32)
+      CASE_TYPE(SINT64, SInt64, Int64)
+      CASE_TYPE(STRING, String, String)
+#undef CASE_TYPE
+  }
+}
+
+static void SerializeMapValueRefWithCachedSizes(const FieldDescriptor* field,
+                                                const MapValueRef& value,
+                                                io::CodedOutputStream* output) {
+  switch (field->type()) {
+#define CASE_TYPE(FieldType, CamelFieldType, CamelCppType)                     \
+  case FieldDescriptor::TYPE_##FieldType:                                      \
+    WireFormatLite::Write##CamelFieldType(2, value.Get##CamelCppType##Value(), \
+                                          output);                             \
+    break;
+    CASE_TYPE(INT64, Int64, Int64)
+    CASE_TYPE(UINT64, UInt64, UInt64)
+    CASE_TYPE(INT32, Int32, Int32)
+    CASE_TYPE(FIXED64, Fixed64, UInt64)
+    CASE_TYPE(FIXED32, Fixed32, UInt32)
+    CASE_TYPE(BOOL, Bool, Bool)
+    CASE_TYPE(UINT32, UInt32, UInt32)
+    CASE_TYPE(SFIXED32, SFixed32, Int32)
+    CASE_TYPE(SFIXED64, SFixed64, Int64)
+    CASE_TYPE(SINT32, SInt32, Int32)
+    CASE_TYPE(SINT64, SInt64, Int64)
+    CASE_TYPE(ENUM, Enum, Enum)
+    CASE_TYPE(DOUBLE, Double, Double)
+    CASE_TYPE(FLOAT, Float, Float)
+    CASE_TYPE(STRING, String, String)
+    CASE_TYPE(BYTES, Bytes, String)
+    CASE_TYPE(MESSAGE, Message, Message)
+    CASE_TYPE(GROUP, Group, Message)
+#undef CASE_TYPE
+  }
+}
+
+class MapKeySorter {
+ public:
+  static std::vector<MapKey> SortKey(const Message& message,
+                                     const Reflection* reflection,
+                                     const FieldDescriptor* field) {
+    std::vector<MapKey> sorted_key_list;
+    for (MapIterator it =
+             reflection->MapBegin(const_cast<Message*>(&message), field);
+         it != reflection->MapEnd(const_cast<Message*>(&message), field);
+         ++it) {
+      sorted_key_list.push_back(it.GetKey());
+    }
+    MapKeyComparator comparator;
+    std::sort(sorted_key_list.begin(), sorted_key_list.end(), comparator);
+    return sorted_key_list;
+  }
+
+ private:
+  class MapKeyComparator {
+   public:
+    bool operator()(const MapKey& a, const MapKey& b) const {
+      GOOGLE_DCHECK(a.type() == b.type());
+      switch (a.type()) {
+#define CASE_TYPE(CppType, CamelCppType)                                \
+  case FieldDescriptor::CPPTYPE_##CppType: {                            \
+    return a.Get##CamelCppType##Value() < b.Get##CamelCppType##Value(); \
+  }
+        CASE_TYPE(STRING, String)
+        CASE_TYPE(INT64, Int64)
+        CASE_TYPE(INT32, Int32)
+        CASE_TYPE(UINT64, UInt64)
+        CASE_TYPE(UINT32, UInt32)
+        CASE_TYPE(BOOL, Bool)
+#undef CASE_TYPE
+
+        default:
+          GOOGLE_LOG(DFATAL) << "Invalid key for map field.";
+          return true;
+      }
+    }
+  };
+};
+
+static void SerializeMapEntry(const FieldDescriptor* field, const MapKey& key,
+                              const MapValueRef& value,
+                              io::CodedOutputStream* output) {
+  const FieldDescriptor* key_field = field->message_type()->field(0);
+  const FieldDescriptor* value_field = field->message_type()->field(1);
+
+  WireFormatLite::WriteTag(field->number(),
+                           WireFormatLite::WIRETYPE_LENGTH_DELIMITED, output);
+  size_t size = kMapEntryTagByteSize;
+  size += MapKeyDataOnlyByteSize(key_field, key);
+  size += MapValueRefDataOnlyByteSize(value_field, value);
+  output->WriteVarint32(size);
+  SerializeMapKeyWithCachedSizes(key_field, key, output);
+  SerializeMapValueRefWithCachedSizes(value_field, value, output);
+}
+
 void WireFormat::SerializeFieldWithCachedSizes(
     const FieldDescriptor* field,
     const Message& message,
@@ -828,10 +969,55 @@ void WireFormat::SerializeFieldWithCachedSizes(
     return;
   }
 
+  // For map fields, we can use either repeated field reflection or map
+  // reflection.  Our choice has some subtle effects.  If we use repeated field
+  // reflection here, then the repeated field representation becomes
+  // authoritative for this field: any existing references that came from map
+  // reflection remain valid for reading, but mutations to them are lost and
+  // will be overwritten next time we call map reflection!
+  //
+  // So far this mainly affects Python, which keeps long-term references to map
+  // values around, and always uses map reflection.  See: b/35918691
+  //
+  // Here we choose to use map reflection API as long as the internal
+  // map is valid. In this way, the serialization doesn't change map field's
+  // internal state and existing references that came from map reflection remain
+  // valid for both reading and writing.
+  if (field->is_map()) {
+    MapFieldBase* map_field =
+        message_reflection->MapData(const_cast<Message*>(&message), field);
+    if (map_field->IsMapValid()) {
+      if (output->IsSerializationDeterministic()) {
+        std::vector<MapKey> sorted_key_list =
+            MapKeySorter::SortKey(message, message_reflection, field);
+        for (std::vector<MapKey>::iterator it = sorted_key_list.begin();
+             it != sorted_key_list.end(); ++it) {
+          MapValueRef map_value;
+          message_reflection->InsertOrLookupMapValue(
+              const_cast<Message*>(&message), field, *it, &map_value);
+          SerializeMapEntry(field, *it, map_value, output);
+        }
+      } else {
+        for (MapIterator it = message_reflection->MapBegin(
+                 const_cast<Message*>(&message), field);
+             it !=
+             message_reflection->MapEnd(const_cast<Message*>(&message), field);
+             ++it) {
+          SerializeMapEntry(field, it.GetKey(), it.GetValueRef(), output);
+        }
+      }
+
+      return;
+    }
+  }
+
   int count = 0;
 
   if (field->is_repeated()) {
     count = message_reflection->FieldSize(message, field);
+  } else if (field->containing_type()->options().map_entry()) {
+    // Map entry fields always need to be serialized.
+    count = 1;
   } else if (message_reflection->HasField(message, field)) {
     count = 1;
   }
@@ -982,7 +1168,16 @@ size_t WireFormat::ByteSize(const Message& message) {
   size_t our_size = 0;
 
   std::vector<const FieldDescriptor*> fields;
-  message_reflection->ListFields(message, &fields);
+
+  // Fields of map entry should always be serialized.
+  if (descriptor->options().map_entry()) {
+    for (int i = 0; i < descriptor->field_count(); i++) {
+      fields.push_back(descriptor->field(i));
+    }
+  } else {
+    message_reflection->ListFields(message, &fields);
+  }
+
   for (int i = 0; i < fields.size(); i++) {
     our_size += FieldByteSize(fields[i], message);
   }
@@ -1013,6 +1208,9 @@ size_t WireFormat::FieldByteSize(
   size_t count = 0;
   if (field->is_repeated()) {
     count = FromIntSize(message_reflection->FieldSize(message, field));
+  } else if (field->containing_type()->options().map_entry()) {
+    // Map entry fields always need to be serialized.
+    count = 1;
   } else if (message_reflection->HasField(message, field)) {
     count = 1;
   }
@@ -1033,20 +1231,124 @@ size_t WireFormat::FieldByteSize(
   return our_size;
 }
 
+static size_t MapKeyDataOnlyByteSize(const FieldDescriptor* field,
+                                     const MapKey& value) {
+  GOOGLE_DCHECK_EQ(FieldDescriptor::TypeToCppType(field->type()), value.type());
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_DOUBLE:
+    case FieldDescriptor::TYPE_FLOAT:
+    case FieldDescriptor::TYPE_GROUP:
+    case FieldDescriptor::TYPE_MESSAGE:
+    case FieldDescriptor::TYPE_BYTES:
+    case FieldDescriptor::TYPE_ENUM:
+      GOOGLE_LOG(FATAL) << "Unsupported";
+      return 0;
+#define CASE_TYPE(FieldType, CamelFieldType, CamelCppType) \
+  case FieldDescriptor::TYPE_##FieldType:                  \
+    return WireFormatLite::CamelFieldType##Size(           \
+        value.Get##CamelCppType##Value());
+
+#define FIXED_CASE_TYPE(FieldType, CamelFieldType) \
+  case FieldDescriptor::TYPE_##FieldType:          \
+    return WireFormatLite::k##CamelFieldType##Size;
+
+      CASE_TYPE(INT32, Int32, Int32);
+      CASE_TYPE(INT64, Int64, Int64);
+      CASE_TYPE(UINT32, UInt32, UInt32);
+      CASE_TYPE(UINT64, UInt64, UInt64);
+      CASE_TYPE(SINT32, SInt32, Int32);
+      CASE_TYPE(SINT64, SInt64, Int64);
+      CASE_TYPE(STRING, String, String);
+      FIXED_CASE_TYPE(FIXED32, Fixed32);
+      FIXED_CASE_TYPE(FIXED64, Fixed64);
+      FIXED_CASE_TYPE(SFIXED32, SFixed32);
+      FIXED_CASE_TYPE(SFIXED64, SFixed64);
+      FIXED_CASE_TYPE(BOOL, Bool);
+
+#undef CASE_TYPE
+#undef FIXED_CASE_TYPE
+  }
+  GOOGLE_LOG(FATAL) << "Cannot get here";
+  return 0;
+}
+
+static size_t MapValueRefDataOnlyByteSize(const FieldDescriptor* field,
+                                          const MapValueRef& value) {
+  switch (field->type()) {
+    case FieldDescriptor::TYPE_GROUP:
+      GOOGLE_LOG(FATAL) << "Unsupported";
+      return 0;
+#define CASE_TYPE(FieldType, CamelFieldType, CamelCppType) \
+  case FieldDescriptor::TYPE_##FieldType:                  \
+    return WireFormatLite::CamelFieldType##Size(           \
+        value.Get##CamelCppType##Value());
+
+#define FIXED_CASE_TYPE(FieldType, CamelFieldType) \
+  case FieldDescriptor::TYPE_##FieldType:          \
+    return WireFormatLite::k##CamelFieldType##Size;
+
+      CASE_TYPE(INT32, Int32, Int32);
+      CASE_TYPE(INT64, Int64, Int64);
+      CASE_TYPE(UINT32, UInt32, UInt32);
+      CASE_TYPE(UINT64, UInt64, UInt64);
+      CASE_TYPE(SINT32, SInt32, Int32);
+      CASE_TYPE(SINT64, SInt64, Int64);
+      CASE_TYPE(STRING, String, String);
+      CASE_TYPE(BYTES, Bytes, String);
+      CASE_TYPE(ENUM, Enum, Enum);
+      CASE_TYPE(MESSAGE, Message, Message);
+      FIXED_CASE_TYPE(FIXED32, Fixed32);
+      FIXED_CASE_TYPE(FIXED64, Fixed64);
+      FIXED_CASE_TYPE(SFIXED32, SFixed32);
+      FIXED_CASE_TYPE(SFIXED64, SFixed64);
+      FIXED_CASE_TYPE(DOUBLE, Double);
+      FIXED_CASE_TYPE(FLOAT, Float);
+      FIXED_CASE_TYPE(BOOL, Bool);
+
+#undef CASE_TYPE
+#undef FIXED_CASE_TYPE
+  }
+  GOOGLE_LOG(FATAL) << "Cannot get here";
+  return 0;
+}
+
 size_t WireFormat::FieldDataOnlyByteSize(
     const FieldDescriptor* field,
     const Message& message) {
   const Reflection* message_reflection = message.GetReflection();
 
+  size_t data_size = 0;
+
+  if (field->is_map()) {
+    MapFieldBase* map_field =
+        message_reflection->MapData(const_cast<Message*>(&message), field);
+    if (map_field->IsMapValid()) {
+      MapIterator iter(const_cast<Message*>(&message), field);
+      MapIterator end(const_cast<Message*>(&message), field);
+      const FieldDescriptor* key_field = field->message_type()->field(0);
+      const FieldDescriptor* value_field = field->message_type()->field(1);
+      for (map_field->MapBegin(&iter), map_field->MapEnd(&end); iter != end;
+           ++iter) {
+        size_t size = kMapEntryTagByteSize;
+        size += MapKeyDataOnlyByteSize(key_field, iter.GetKey());
+        size += MapValueRefDataOnlyByteSize(value_field, iter.GetValueRef());
+        data_size += WireFormatLite::LengthDelimitedSize(size);
+      }
+      return data_size;
+    }
+  }
+
   size_t count = 0;
   if (field->is_repeated()) {
     count =
         internal::FromIntSize(message_reflection->FieldSize(message, field));
+  } else if (field->containing_type()->options().map_entry()) {
+    // Map entry fields always need to be serialized.
+    count = 1;
   } else if (message_reflection->HasField(message, field)) {
     count = 1;
   }
 
-  size_t data_size = 0;
   switch (field->type()) {
 #define HANDLE_TYPE(TYPE, TYPE_METHOD, CPPTYPE_METHOD)                     \
     case FieldDescriptor::TYPE_##TYPE:                                     \
diff --git a/src/google/protobuf/wire_format.h b/src/google/protobuf/wire_format.h
index 5e9aca52..d602d214 100644
--- a/src/google/protobuf/wire_format.h
+++ b/src/google/protobuf/wire_format.h
@@ -41,16 +41,10 @@
 
 #include <string>
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/wire_format_lite.h>
 
-// Do UTF-8 validation on string type in Debug build only
-#ifndef NDEBUG
-#define GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
-#endif
-
 namespace google {
 namespace protobuf {
   namespace io {
diff --git a/src/google/protobuf/wire_format_lite.cc b/src/google/protobuf/wire_format_lite.cc
index e46ac400..1d8cda5a 100644
--- a/src/google/protobuf/wire_format_lite.cc
+++ b/src/google/protobuf/wire_format_lite.cc
@@ -34,9 +34,6 @@
 
 #include <google/protobuf/wire_format_lite_inl.h>
 
-#ifdef __SSE_4_1__
-#include <immintrin.h>
-#endif
 #include <stack>
 #include <string>
 #include <vector>
@@ -123,6 +120,8 @@ WireFormatLite::kWireTypeForFieldType[MAX_FIELD_TYPE + 1] = {
 
 bool WireFormatLite::SkipField(
     io::CodedInputStream* input, uint32 tag) {
+  // Field number 0 is illegal.
+  if (WireFormatLite::GetTagFieldNumber(tag) == 0) return false;
   switch (WireFormatLite::GetTagWireType(tag)) {
     case WireFormatLite::WIRETYPE_VARINT: {
       uint64 value;
@@ -168,6 +167,8 @@ bool WireFormatLite::SkipField(
 
 bool WireFormatLite::SkipField(
     io::CodedInputStream* input, uint32 tag, io::CodedOutputStream* output) {
+  // Field number 0 is illegal.
+  if (WireFormatLite::GetTagFieldNumber(tag) == 0) return false;
   switch (WireFormatLite::GetTagWireType(tag)) {
     case WireFormatLite::WIRETYPE_VARINT: {
       uint64 value;
@@ -340,6 +341,8 @@ bool WireFormatLite::ReadPackedEnumPreserveUnknowns(
   return true;
 }
 
+#if !defined(PROTOBUF_LITTLE_ENDIAN)
+
 namespace {
 void EncodeFixedSizeValue(float v, uint8* dest) {
   WireFormatLite::WriteFloatNoTagToArray(v, dest);
@@ -370,6 +373,8 @@ void EncodeFixedSizeValue(bool v, uint8* dest) {
 }
 }  // anonymous namespace
 
+#endif  // !defined(PROTOBUF_LITTLE_ENDIAN)
+
 template <typename CType>
 static void WriteArray(const CType* a, int n, io::CodedOutputStream* output) {
 #if defined(PROTOBUF_LITTLE_ENDIAN)
@@ -378,7 +383,7 @@ static void WriteArray(const CType* a, int n, io::CodedOutputStream* output) {
   const int kAtATime = 128;
   uint8 buf[sizeof(CType) * kAtATime];
   for (int i = 0; i < n; i += kAtATime) {
-    int to_do = min(kAtATime, n - i);
+    int to_do = std::min(kAtATime, n - i);
     uint8* ptr = buf;
     for (int j = 0; j < to_do; j++) {
       EncodeFixedSizeValue(a[i+j], ptr);
@@ -578,7 +583,7 @@ void WireFormatLite::WriteMessageMaybeToArray(int field_number,
   }
 }
 
-GOOGLE_ATTRIBUTE_ALWAYS_INLINE static bool ReadBytesToString(
+GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE static bool ReadBytesToString(
     io::CodedInputStream* input, string* value);
 inline static bool ReadBytesToString(io::CodedInputStream* input,
                                      string* value) {
@@ -627,12 +632,12 @@ bool WireFormatLite::VerifyUtf8String(const char* data,
   return true;
 }
 
-#ifdef __SSE_4_1__
-template<typename T, bool ZigZag, bool SignExtended>
-static size_t VarintSize(
-    const T* data, const int n,
-    const internal::enable_if<sizeof(T) == 4>::type* = NULL) {
+// this code is deliberately written such that clang makes it into really
+// efficient SSE code.
+template<bool ZigZag, bool SignExtended, typename T>
+static size_t VarintSize(const T* data, const int n) {
 #if __cplusplus >= 201103L
+  static_assert(sizeof(T) == 4, "This routine only works for 32 bit integers");
   // is_unsigned<T> => !ZigZag
   static_assert((std::is_unsigned<T>::value ^ ZigZag) ||
                 std::is_signed<T>::value,
@@ -641,101 +646,83 @@ static size_t VarintSize(
   static_assert((std::is_unsigned<T>::value ^ SignExtended) ||
                 std::is_signed<T>::value,
                 "Cannot SignExtended unsigned types");
+  static_assert(!(SignExtended && ZigZag),
+                "Cannot SignExtended and ZigZag on the same type");
 #endif
-
-  union vus32 {
-    uint32  u[4];
-    int32   s[4];
-    __m128i v;
-  };
-
-  static const vus32 ones = {{1, 1, 1, 1}};
-
-  // CodedOutputStream::VarintSize32SignExtended returns 10 for negative
-  // numbers.  We can apply the UInt32Size algorithm, and simultaneously logical
-  // shift the MSB into the LSB to determine if it is negative.
-  static const vus32 fives = {{5, 5, 5, 5}};
-
-  // sum is the vectorized-output of calling CodedOutputStream::VarintSize32 on
-  // the processed elements.
-  //
-  // msb_sum is the count of set most-significant bits.  When computing the
-  // vectorized CodedOutputStream::VarintSize32SignExtended, negative values
-  // have the most significant bit set.  VarintSize32SignExtended returns 10 and
-  // VarintSize32 returns 5.  msb_sum allows us to compute:
-  //   VarintSize32SignExtended = msb_sum * 5 + VarintSize32
-  vus32 sum, v, msb_sum;
-  sum.v = _mm_setzero_si128();
-  msb_sum.v = _mm_setzero_si128();
-
-  int rounded = n & ~(3);
-  int i;
-  for (i = 0; i < rounded; i += 4) {
-    v.v = _mm_loadu_si128(reinterpret_cast<const __m128i*>(&data[i]));
-
+  uint32 sum = n;
+  uint32 msb_sum = 0;
+  for (int i = 0; i < n; i++) {
+    uint32 x = data[i];
     if (ZigZag) {
-      // Note:  the right-shift must be arithmetic
-      v.v = _mm_xor_si128(_mm_slli_epi32(v.v, 1), _mm_srai_epi32(v.v, 31));
-    }
-
-    sum.v = _mm_add_epi32(sum.v, ones.v);
-    if (SignExtended) {
-      msb_sum.v = _mm_add_epi32(msb_sum.v, _mm_srli_epi32(v.v, 31));
-    }
-
-    v.v = _mm_srli_epi32(v.v, 7);
-
-    for (int j = 0; j < 4; j++) {
-      __m128i min = _mm_min_epi32(v.v, ones.v);
-
-      sum.v = _mm_add_epi32(sum.v, min);
-      v.v   = _mm_srli_epi32(v.v, 7);
+      x = WireFormatLite::ZigZagEncode32(x);
+    } else if (SignExtended) {
+      msb_sum += x >> 31;
     }
+    // clang is so smart that it produces optimal SSE sequence unrolling
+    // the loop 8 ints at a time. With a sequence of 4
+    // cmpres = cmpgt x, sizeclass  ( -1 or 0)
+    // sum = sum - cmpres
+    if (x > 0x7F) sum++;
+    if (x > 0x3FFF) sum++;
+    if (x > 0x1FFFFF) sum++;
+    if (x > 0xFFFFFFF) sum++;
   }
+  if (SignExtended) sum += msb_sum * 5;
+  return sum;
+}
 
-  if (SignExtended) {
-    vus32 extensions;
-    extensions.v = _mm_mullo_epi32(msb_sum.v, fives.v);
-
-    sum.v = _mm_add_epi32(sum.v, extensions.v);
-  }
-
-  // TODO(ckennelly): Can we avoid the sign conversion?
-  size_t out = _mm_cvtsi128_si32(
-      _mm_hadd_epi32(_mm_hadd_epi32(sum.v, ones.v), ones.v));
-
-  // Finish tail.
-  for (; i < n; i++) {
+template<bool ZigZag, typename T>
+static size_t VarintSize64(const T* data, const int n) {
+#if __cplusplus >= 201103L
+  static_assert(sizeof(T) == 8, "This routine only works for 64 bit integers");
+  // is_unsigned<T> => !ZigZag
+  static_assert(!ZigZag || !std::is_unsigned<T>::value,
+                "Cannot ZigZag encode unsigned types");
+#endif
+  uint64 sum = n;
+  for (int i = 0; i < n; i++) {
+    uint64 x = data[i];
     if (ZigZag) {
-      out += WireFormatLite::SInt32Size(data[i]);
-    } else if (SignExtended) {
-      out += WireFormatLite::Int32Size(data[i]);
-    } else {
-      out += WireFormatLite::UInt32Size(data[i]);
+      x = WireFormatLite::ZigZagEncode64(x);
     }
+    // First step is a binary search, we can't branch in sse so we use the
+    // result of the compare to adjust sum and appropriately. This code is
+    // written to make clang recognize the vectorization.
+    uint64 tmp = x >= (static_cast<uint64>(1) << 35) ? -1 : 0;
+    sum += 5 & tmp;
+    x >>= 35 & tmp;
+    if (x > 0x7F) sum++;
+    if (x > 0x3FFF) sum++;
+    if (x > 0x1FFFFF) sum++;
+    if (x > 0xFFFFFFF) sum++;
   }
-
-  return out;
+  return sum;
 }
 
+// GCC does not recognize the vectorization opportunity
+// and other platforms are untested, in those cases using the optimized
+// varint size routine for each element is faster.
+// Hence we enable it only for clang
+#if defined(__SSE__) && defined(__clang__)
 size_t WireFormatLite::Int32Size(const RepeatedField<int32>& value) {
-  return VarintSize<int32, false, true>(value.data(), value.size());
+  return VarintSize<false, true>(value.data(), value.size());
 }
 
 size_t WireFormatLite::UInt32Size(const RepeatedField<uint32>& value) {
-  return VarintSize<uint32, false, false>(value.data(), value.size());
+  return VarintSize<false, false>(value.data(), value.size());
 }
 
 size_t WireFormatLite::SInt32Size(const RepeatedField<int32>& value) {
-  return VarintSize<int32, true, true>(value.data(), value.size());
+  return VarintSize<true, false>(value.data(), value.size());
 }
 
 size_t WireFormatLite::EnumSize(const RepeatedField<int>& value) {
   // On ILP64, sizeof(int) == 8, which would require a different template.
-  return VarintSize<int, false, true>(value.data(), value.size());
+  return VarintSize<false, true>(value.data(), value.size());
 }
 
-#else  // !__SSE_4_1__
+#else  // !(defined(__SSE4_1__) && defined(__clang__))
+
 size_t WireFormatLite::Int32Size(const RepeatedField<int32>& value) {
   size_t out = 0;
   const int n = value.size();
@@ -771,6 +758,56 @@ size_t WireFormatLite::EnumSize(const RepeatedField<int>& value) {
   }
   return out;
 }
+
+#endif
+
+// Micro benchmarks show that the SSE improved loop only starts beating
+// the normal loop on Haswell platforms and then only for >32 ints. We
+// disable this for now. Some specialized users might find it worthwhile to
+// enable this.
+#define USE_SSE_FOR_64_BIT_INTEGER_ARRAYS 0
+#if USE_SSE_FOR_64_BIT_INTEGER_ARRAYS
+size_t WireFormatLite::Int64Size (const RepeatedField< int64>& value) {
+  return VarintSize64<false>(value.data(), value.size());
+}
+
+size_t WireFormatLite::UInt64Size(const RepeatedField<uint64>& value) {
+  return VarintSize64<false>(value.data(), value.size());
+}
+
+size_t WireFormatLite::SInt64Size(const RepeatedField< int64>& value) {
+  return VarintSize64<true>(value.data(), value.size());
+}
+
+#else
+
+size_t WireFormatLite::Int64Size (const RepeatedField< int64>& value) {
+  size_t out = 0;
+  const int n = value.size();
+  for (int i = 0; i < n; i++) {
+    out += Int64Size(value.Get(i));
+  }
+  return out;
+}
+
+size_t WireFormatLite::UInt64Size(const RepeatedField<uint64>& value) {
+  size_t out = 0;
+  const int n = value.size();
+  for (int i = 0; i < n; i++) {
+    out += UInt64Size(value.Get(i));
+  }
+  return out;
+}
+
+size_t WireFormatLite::SInt64Size(const RepeatedField< int64>& value) {
+  size_t out = 0;
+  const int n = value.size();
+  for (int i = 0; i < n; i++) {
+    out += SInt64Size(value.Get(i));
+  }
+  return out;
+}
+
 #endif
 
 }  // namespace internal
diff --git a/src/google/protobuf/wire_format_lite.h b/src/google/protobuf/wire_format_lite.h
index 60355144..77eaa9a6 100644
--- a/src/google/protobuf/wire_format_lite.h
+++ b/src/google/protobuf/wire_format_lite.h
@@ -41,10 +41,17 @@
 #define GOOGLE_PROTOBUF_WIRE_FORMAT_LITE_H__
 
 #include <string>
+
 #include <google/protobuf/stubs/common.h>
-#include <google/protobuf/repeated_field.h>
+#include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/message_lite.h>
-#include <google/protobuf/io/coded_stream.h>  // for CodedOutputStream::Varint32Size
+#include <google/protobuf/stubs/port.h>
+#include <google/protobuf/repeated_field.h>
+
+// Do UTF-8 validation on string type in Debug build only
+#ifndef NDEBUG
+#define GOOGLE_PROTOBUF_UTF8_VALIDATION_ENABLED
+#endif
 
 // Avoid conflict with iOS where <ConditionalMacros.h> #defines TYPE_BOOL.
 //
@@ -144,7 +151,7 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   // Helper method to get the CppType for a particular Type.
   static CppType FieldTypeToCppType(FieldType type);
 
-  // Given a FieldSescriptor::Type return its WireType
+  // Given a FieldDescriptor::Type return its WireType
   static inline WireFormatLite::WireType WireTypeForFieldType(
       WireFormatLite::FieldType type) {
     return kWireTypeForFieldType[type];
@@ -197,7 +204,7 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
 // type-safe, though, so prefer it if possible.
 #define GOOGLE_PROTOBUF_WIRE_FORMAT_MAKE_TAG(FIELD_NUMBER, TYPE)                  \
   static_cast<uint32>(                                                   \
-    ((FIELD_NUMBER) << ::google::protobuf::internal::WireFormatLite::kTagTypeBits) \
+    (static_cast<uint32>(FIELD_NUMBER) << ::google::protobuf::internal::WireFormatLite::kTagTypeBits) \
       | (TYPE))
 
   // These are the tags for the old MessageSet format, which was defined as:
@@ -250,12 +257,8 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   // of these methods are defined in wire_format_lite_inl.h; you must #include
   // that file to use these.
 
-// Avoid ugly line wrapping
-#define input  io::CodedInputStream*  input_arg
-#define output io::CodedOutputStream* output_arg
-#define field_number int field_number_arg
 #ifdef NDEBUG
-#define INL GOOGLE_ATTRIBUTE_ALWAYS_INLINE
+#define INL GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
 #else
 // Avoid excessive inlining in non-optimized builds. Without other optimizations
 // the inlining is not going to provide benefits anyway and the huge resulting
@@ -270,24 +273,22 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   // For primitive fields, we just use a templatized routine parameterized by
   // the represented type and the FieldType. These are specialized with the
   // appropriate definition for each declared type.
-  template <typename CType, enum FieldType DeclaredType> INL
-  static bool ReadPrimitive(input, CType* value);
+  template <typename CType, enum FieldType DeclaredType>
+  INL static bool ReadPrimitive(io::CodedInputStream* input, CType* value);
 
   // Reads repeated primitive values, with optimizations for repeats.
   // tag_size and tag should both be compile-time constants provided by the
   // protocol compiler.
-  template <typename CType, enum FieldType DeclaredType> INL
-  static bool ReadRepeatedPrimitive(int tag_size,
-                                    uint32 tag,
-                                    input,
-                                    RepeatedField<CType>* value);
+  template <typename CType, enum FieldType DeclaredType>
+  INL static bool ReadRepeatedPrimitive(int tag_size, uint32 tag,
+                                        io::CodedInputStream* input,
+                                        RepeatedField<CType>* value);
 
   // Identical to ReadRepeatedPrimitive, except will not inline the
   // implementation.
   template <typename CType, enum FieldType DeclaredType>
-  static bool ReadRepeatedPrimitiveNoInline(int tag_size,
-                                            uint32 tag,
-                                            input,
+  static bool ReadRepeatedPrimitiveNoInline(int tag_size, uint32 tag,
+                                            io::CodedInputStream* input,
                                             RepeatedField<CType>* value);
 
   // Reads a primitive value directly from the provided buffer. It returns a
@@ -301,40 +302,39 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   // Reads a primitive packed field.
   //
   // This is only implemented for packable types.
-  template <typename CType, enum FieldType DeclaredType> INL
-  static bool ReadPackedPrimitive(input, RepeatedField<CType>* value);
+  template <typename CType, enum FieldType DeclaredType>
+  INL static bool ReadPackedPrimitive(io::CodedInputStream* input,
+                                      RepeatedField<CType>* value);
 
   // Identical to ReadPackedPrimitive, except will not inline the
   // implementation.
   template <typename CType, enum FieldType DeclaredType>
-  static bool ReadPackedPrimitiveNoInline(input, RepeatedField<CType>* value);
+  static bool ReadPackedPrimitiveNoInline(io::CodedInputStream* input,
+                                          RepeatedField<CType>* value);
 
   // Read a packed enum field. If the is_valid function is not NULL, values for
   // which is_valid(value) returns false are silently dropped.
-  static bool ReadPackedEnumNoInline(input,
+  static bool ReadPackedEnumNoInline(io::CodedInputStream* input,
                                      bool (*is_valid)(int),
                                      RepeatedField<int>* values);
 
   // Read a packed enum field. If the is_valid function is not NULL, values for
   // which is_valid(value) returns false are appended to unknown_fields_stream.
   static bool ReadPackedEnumPreserveUnknowns(
-      input,
-      field_number,
-      bool (*is_valid)(int),
-      io::CodedOutputStream* unknown_fields_stream,
-      RepeatedField<int>* values);
+      io::CodedInputStream* input, int field_number, bool (*is_valid)(int),
+      io::CodedOutputStream* unknown_fields_stream, RepeatedField<int>* values);
 
   // Read a string.  ReadString(..., string* value) requires an existing string.
-  static inline bool ReadString(input, string* value);
+  static inline bool ReadString(io::CodedInputStream* input, string* value);
   // ReadString(..., string** p) is internal-only, and should only be called
   // from generated code. It starts by setting *p to "new string"
   // if *p == &GetEmptyStringAlreadyInited().  It then invokes
-  // ReadString(input, *p).  This is useful for reducing code size.
-  static inline bool ReadString(input, string** p);
+  // ReadString(io::CodedInputStream* input, *p).  This is useful for reducing
+  // code size.
+  static inline bool ReadString(io::CodedInputStream* input, string** p);
   // Analogous to ReadString().
-  static bool ReadBytes(input, string* value);
-  static bool ReadBytes(input, string** p);
-
+  static bool ReadBytes(io::CodedInputStream* input, string* value);
+  static bool ReadBytes(io::CodedInputStream* input, string** p);
 
   enum Operation {
     PARSE = 0,
@@ -346,195 +346,319 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
                                Operation op,
                                const char* field_name);
 
-  static inline bool ReadGroup  (field_number, input, MessageLite* value);
-  static inline bool ReadMessage(input, MessageLite* value);
+  template <typename MessageType>
+  static inline bool ReadGroup(int field_number, io::CodedInputStream* input,
+                               MessageType* value);
 
-  // Like above, but de-virtualize the call to MergePartialFromCodedStream().
-  // The pointer must point at an instance of MessageType, *not* a subclass (or
-  // the subclass must not override MergePartialFromCodedStream()).
-  template<typename MessageType>
-  static inline bool ReadGroupNoVirtual(field_number, input,
-                                        MessageType* value);
-  template<typename MessageType>
-  static inline bool ReadMessageNoVirtual(input, MessageType* value);
+  template <typename MessageType>
+  static inline bool ReadMessage(io::CodedInputStream* input,
+                                 MessageType* value);
 
-  // The same, but do not modify input's recursion depth.  This is useful
-  // when reading a bunch of groups or messages in a loop, because then the
-  // recursion depth can be incremented before the loop and decremented after.
-  template<typename MessageType>
-  static inline bool ReadGroupNoVirtualNoRecursionDepth(field_number, input,
-                                                        MessageType* value);
+  // Do not use.
+  template <typename MessageType>
+  static inline bool ReadGroupNoVirtual(int field_number,
+                                        io::CodedInputStream* input,
+                                        MessageType* value) {
+    return ReadGroup(field_number, input, value);
+  }
 
   template<typename MessageType>
-  static inline bool ReadMessageNoVirtualNoRecursionDepth(input,
-                                                          MessageType* value);
+  static inline bool ReadMessageNoVirtual(io::CodedInputStream* input,
+                                          MessageType* value) {
+    return ReadMessage(input, value);
+  }
 
   // Write a tag.  The Write*() functions typically include the tag, so
   // normally there's no need to call this unless using the Write*NoTag()
   // variants.
-  INL static void WriteTag(field_number, WireType type, output);
+  INL static void WriteTag(int field_number, WireType type,
+                           io::CodedOutputStream* output);
 
   // Write fields, without tags.
-  INL static void WriteInt32NoTag   (int32 value, output);
-  INL static void WriteInt64NoTag   (int64 value, output);
-  INL static void WriteUInt32NoTag  (uint32 value, output);
-  INL static void WriteUInt64NoTag  (uint64 value, output);
-  INL static void WriteSInt32NoTag  (int32 value, output);
-  INL static void WriteSInt64NoTag  (int64 value, output);
-  INL static void WriteFixed32NoTag (uint32 value, output);
-  INL static void WriteFixed64NoTag (uint64 value, output);
-  INL static void WriteSFixed32NoTag(int32 value, output);
-  INL static void WriteSFixed64NoTag(int64 value, output);
-  INL static void WriteFloatNoTag   (float value, output);
-  INL static void WriteDoubleNoTag  (double value, output);
-  INL static void WriteBoolNoTag    (bool value, output);
-  INL static void WriteEnumNoTag    (int value, output);
+  INL static void WriteInt32NoTag(int32 value, io::CodedOutputStream* output);
+  INL static void WriteInt64NoTag(int64 value, io::CodedOutputStream* output);
+  INL static void WriteUInt32NoTag(uint32 value, io::CodedOutputStream* output);
+  INL static void WriteUInt64NoTag(uint64 value, io::CodedOutputStream* output);
+  INL static void WriteSInt32NoTag(int32 value, io::CodedOutputStream* output);
+  INL static void WriteSInt64NoTag(int64 value, io::CodedOutputStream* output);
+  INL static void WriteFixed32NoTag(uint32 value,
+                                    io::CodedOutputStream* output);
+  INL static void WriteFixed64NoTag(uint64 value,
+                                    io::CodedOutputStream* output);
+  INL static void WriteSFixed32NoTag(int32 value,
+                                     io::CodedOutputStream* output);
+  INL static void WriteSFixed64NoTag(int64 value,
+                                     io::CodedOutputStream* output);
+  INL static void WriteFloatNoTag(float value, io::CodedOutputStream* output);
+  INL static void WriteDoubleNoTag(double value, io::CodedOutputStream* output);
+  INL static void WriteBoolNoTag(bool value, io::CodedOutputStream* output);
+  INL static void WriteEnumNoTag(int value, io::CodedOutputStream* output);
 
   // Write array of primitive fields, without tags
-  static void WriteFloatArray   (const float* a, int n, output);
-  static void WriteDoubleArray  (const double* a, int n, output);
-  static void WriteFixed32Array (const uint32* a, int n, output);
-  static void WriteFixed64Array (const uint64* a, int n, output);
-  static void WriteSFixed32Array(const int32* a, int n, output);
-  static void WriteSFixed64Array(const int64* a, int n, output);
-  static void WriteBoolArray    (const bool* a, int n, output);
+  static void WriteFloatArray(const float* a, int n,
+                              io::CodedOutputStream* output);
+  static void WriteDoubleArray(const double* a, int n,
+                               io::CodedOutputStream* output);
+  static void WriteFixed32Array(const uint32* a, int n,
+                                io::CodedOutputStream* output);
+  static void WriteFixed64Array(const uint64* a, int n,
+                                io::CodedOutputStream* output);
+  static void WriteSFixed32Array(const int32* a, int n,
+                                 io::CodedOutputStream* output);
+  static void WriteSFixed64Array(const int64* a, int n,
+                                 io::CodedOutputStream* output);
+  static void WriteBoolArray(const bool* a, int n,
+                             io::CodedOutputStream* output);
 
   // Write fields, including tags.
-  static void WriteInt32   (field_number,  int32 value, output);
-  static void WriteInt64   (field_number,  int64 value, output);
-  static void WriteUInt32  (field_number, uint32 value, output);
-  static void WriteUInt64  (field_number, uint64 value, output);
-  static void WriteSInt32  (field_number,  int32 value, output);
-  static void WriteSInt64  (field_number,  int64 value, output);
-  static void WriteFixed32 (field_number, uint32 value, output);
-  static void WriteFixed64 (field_number, uint64 value, output);
-  static void WriteSFixed32(field_number,  int32 value, output);
-  static void WriteSFixed64(field_number,  int64 value, output);
-  static void WriteFloat   (field_number,  float value, output);
-  static void WriteDouble  (field_number, double value, output);
-  static void WriteBool    (field_number,   bool value, output);
-  static void WriteEnum    (field_number,    int value, output);
-
-  static void WriteString(field_number, const string& value, output);
-  static void WriteBytes (field_number, const string& value, output);
-  static void WriteStringMaybeAliased(
-      field_number, const string& value, output);
-  static void WriteBytesMaybeAliased(
-      field_number, const string& value, output);
-
-  static void WriteGroup(
-    field_number, const MessageLite& value, output);
-  static void WriteMessage(
-    field_number, const MessageLite& value, output);
+  static void WriteInt32(int field_number, int32 value,
+                         io::CodedOutputStream* output);
+  static void WriteInt64(int field_number, int64 value,
+                         io::CodedOutputStream* output);
+  static void WriteUInt32(int field_number, uint32 value,
+                          io::CodedOutputStream* output);
+  static void WriteUInt64(int field_number, uint64 value,
+                          io::CodedOutputStream* output);
+  static void WriteSInt32(int field_number, int32 value,
+                          io::CodedOutputStream* output);
+  static void WriteSInt64(int field_number, int64 value,
+                          io::CodedOutputStream* output);
+  static void WriteFixed32(int field_number, uint32 value,
+                           io::CodedOutputStream* output);
+  static void WriteFixed64(int field_number, uint64 value,
+                           io::CodedOutputStream* output);
+  static void WriteSFixed32(int field_number, int32 value,
+                            io::CodedOutputStream* output);
+  static void WriteSFixed64(int field_number, int64 value,
+                            io::CodedOutputStream* output);
+  static void WriteFloat(int field_number, float value,
+                         io::CodedOutputStream* output);
+  static void WriteDouble(int field_number, double value,
+                          io::CodedOutputStream* output);
+  static void WriteBool(int field_number, bool value,
+                        io::CodedOutputStream* output);
+  static void WriteEnum(int field_number, int value,
+                        io::CodedOutputStream* output);
+
+  static void WriteString(int field_number, const string& value,
+                          io::CodedOutputStream* output);
+  static void WriteBytes(int field_number, const string& value,
+                         io::CodedOutputStream* output);
+  static void WriteStringMaybeAliased(int field_number, const string& value,
+                                      io::CodedOutputStream* output);
+  static void WriteBytesMaybeAliased(int field_number, const string& value,
+                                     io::CodedOutputStream* output);
+
+  static void WriteGroup(int field_number, const MessageLite& value,
+                         io::CodedOutputStream* output);
+  static void WriteMessage(int field_number, const MessageLite& value,
+                           io::CodedOutputStream* output);
   // Like above, but these will check if the output stream has enough
   // space to write directly to a flat array.
-  static void WriteGroupMaybeToArray(
-    field_number, const MessageLite& value, output);
-  static void WriteMessageMaybeToArray(
-    field_number, const MessageLite& value, output);
+  static void WriteGroupMaybeToArray(int field_number, const MessageLite& value,
+                                     io::CodedOutputStream* output);
+  static void WriteMessageMaybeToArray(int field_number,
+                                       const MessageLite& value,
+                                       io::CodedOutputStream* output);
 
   // Like above, but de-virtualize the call to SerializeWithCachedSizes().  The
   // pointer must point at an instance of MessageType, *not* a subclass (or
   // the subclass must not override SerializeWithCachedSizes()).
-  template<typename MessageType>
-  static inline void WriteGroupNoVirtual(
-    field_number, const MessageType& value, output);
-  template<typename MessageType>
-  static inline void WriteMessageNoVirtual(
-    field_number, const MessageType& value, output);
-
-#undef output
-#define output uint8* target
+  template <typename MessageType>
+  static inline void WriteGroupNoVirtual(int field_number,
+                                         const MessageType& value,
+                                         io::CodedOutputStream* output);
+  template <typename MessageType>
+  static inline void WriteMessageNoVirtual(int field_number,
+                                           const MessageType& value,
+                                           io::CodedOutputStream* output);
 
   // Like above, but use only *ToArray methods of CodedOutputStream.
-  INL static uint8* WriteTagToArray(field_number, WireType type, output);
+  INL static uint8* WriteTagToArray(int field_number, WireType type,
+                                    uint8* target);
 
   // Write fields, without tags.
-  INL static uint8* WriteInt32NoTagToArray   (int32 value, output);
-  INL static uint8* WriteInt64NoTagToArray   (int64 value, output);
-  INL static uint8* WriteUInt32NoTagToArray  (uint32 value, output);
-  INL static uint8* WriteUInt64NoTagToArray  (uint64 value, output);
-  INL static uint8* WriteSInt32NoTagToArray  (int32 value, output);
-  INL static uint8* WriteSInt64NoTagToArray  (int64 value, output);
-  INL static uint8* WriteFixed32NoTagToArray (uint32 value, output);
-  INL static uint8* WriteFixed64NoTagToArray (uint64 value, output);
-  INL static uint8* WriteSFixed32NoTagToArray(int32 value, output);
-  INL static uint8* WriteSFixed64NoTagToArray(int64 value, output);
-  INL static uint8* WriteFloatNoTagToArray   (float value, output);
-  INL static uint8* WriteDoubleNoTagToArray  (double value, output);
-  INL static uint8* WriteBoolNoTagToArray    (bool value, output);
-  INL static uint8* WriteEnumNoTagToArray    (int value, output);
+  INL static uint8* WriteInt32NoTagToArray(int32 value, uint8* target);
+  INL static uint8* WriteInt64NoTagToArray(int64 value, uint8* target);
+  INL static uint8* WriteUInt32NoTagToArray(uint32 value, uint8* target);
+  INL static uint8* WriteUInt64NoTagToArray(uint64 value, uint8* target);
+  INL static uint8* WriteSInt32NoTagToArray(int32 value, uint8* target);
+  INL static uint8* WriteSInt64NoTagToArray(int64 value, uint8* target);
+  INL static uint8* WriteFixed32NoTagToArray(uint32 value, uint8* target);
+  INL static uint8* WriteFixed64NoTagToArray(uint64 value, uint8* target);
+  INL static uint8* WriteSFixed32NoTagToArray(int32 value, uint8* target);
+  INL static uint8* WriteSFixed64NoTagToArray(int64 value, uint8* target);
+  INL static uint8* WriteFloatNoTagToArray(float value, uint8* target);
+  INL static uint8* WriteDoubleNoTagToArray(double value, uint8* target);
+  INL static uint8* WriteBoolNoTagToArray(bool value, uint8* target);
+  INL static uint8* WriteEnumNoTagToArray(int value, uint8* target);
+
+  // Write fields, without tags.  These require that value.size() > 0.
+  template<typename T>
+  INL static uint8* WritePrimitiveNoTagToArray(
+      const RepeatedField<T>& value,
+      uint8* (*Writer)(T, uint8*), uint8* target);
+  template<typename T>
+  INL static uint8* WriteFixedNoTagToArray(
+      const RepeatedField<T>& value,
+      uint8* (*Writer)(T, uint8*), uint8* target);
+
+  INL static uint8* WriteInt32NoTagToArray(
+      const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteInt64NoTagToArray(
+      const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteUInt32NoTagToArray(
+      const RepeatedField<uint32>& value, uint8* output);
+  INL static uint8* WriteUInt64NoTagToArray(
+      const RepeatedField<uint64>& value, uint8* output);
+  INL static uint8* WriteSInt32NoTagToArray(
+      const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteSInt64NoTagToArray(
+      const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteFixed32NoTagToArray(
+      const RepeatedField<uint32>& value, uint8* output);
+  INL static uint8* WriteFixed64NoTagToArray(
+      const RepeatedField<uint64>& value, uint8* output);
+  INL static uint8* WriteSFixed32NoTagToArray(
+      const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteSFixed64NoTagToArray(
+      const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteFloatNoTagToArray(
+      const RepeatedField< float>& value, uint8* output);
+  INL static uint8* WriteDoubleNoTagToArray(
+      const RepeatedField<double>& value, uint8* output);
+  INL static uint8* WriteBoolNoTagToArray(
+      const RepeatedField<  bool>& value, uint8* output);
+  INL static uint8* WriteEnumNoTagToArray(
+      const RepeatedField<   int>& value, uint8* output);
 
   // Write fields, including tags.
-  INL static uint8* WriteInt32ToArray(field_number, int32 value, output);
-  INL static uint8* WriteInt64ToArray(field_number, int64 value, output);
-  INL static uint8* WriteUInt32ToArray(field_number, uint32 value, output);
-  INL static uint8* WriteUInt64ToArray(field_number, uint64 value, output);
-  INL static uint8* WriteSInt32ToArray(field_number, int32 value, output);
-  INL static uint8* WriteSInt64ToArray(field_number, int64 value, output);
-  INL static uint8* WriteFixed32ToArray(field_number, uint32 value, output);
-  INL static uint8* WriteFixed64ToArray(field_number, uint64 value, output);
-  INL static uint8* WriteSFixed32ToArray(field_number, int32 value, output);
-  INL static uint8* WriteSFixed64ToArray(field_number, int64 value, output);
-  INL static uint8* WriteFloatToArray(field_number, float value, output);
-  INL static uint8* WriteDoubleToArray(field_number, double value, output);
-  INL static uint8* WriteBoolToArray(field_number, bool value, output);
-  INL static uint8* WriteEnumToArray(field_number, int value, output);
-
-  INL static uint8* WriteStringToArray(
-    field_number, const string& value, output);
-  INL static uint8* WriteBytesToArray(
-    field_number, const string& value, output);
+  INL static uint8* WriteInt32ToArray(int field_number, int32 value,
+                                      uint8* target);
+  INL static uint8* WriteInt64ToArray(int field_number, int64 value,
+                                      uint8* target);
+  INL static uint8* WriteUInt32ToArray(int field_number, uint32 value,
+                                       uint8* target);
+  INL static uint8* WriteUInt64ToArray(int field_number, uint64 value,
+                                       uint8* target);
+  INL static uint8* WriteSInt32ToArray(int field_number, int32 value,
+                                       uint8* target);
+  INL static uint8* WriteSInt64ToArray(int field_number, int64 value,
+                                       uint8* target);
+  INL static uint8* WriteFixed32ToArray(int field_number, uint32 value,
+                                        uint8* target);
+  INL static uint8* WriteFixed64ToArray(int field_number, uint64 value,
+                                        uint8* target);
+  INL static uint8* WriteSFixed32ToArray(int field_number, int32 value,
+                                         uint8* target);
+  INL static uint8* WriteSFixed64ToArray(int field_number, int64 value,
+                                         uint8* target);
+  INL static uint8* WriteFloatToArray(int field_number, float value,
+                                      uint8* target);
+  INL static uint8* WriteDoubleToArray(int field_number, double value,
+                                       uint8* target);
+  INL static uint8* WriteBoolToArray(int field_number, bool value,
+                                     uint8* target);
+  INL static uint8* WriteEnumToArray(int field_number, int value,
+                                     uint8* target);
+
+  template<typename T>
+  INL static uint8* WritePrimitiveToArray(
+      int field_number,
+      const RepeatedField<T>& value,
+      uint8* (*Writer)(int, T, uint8*), uint8* target);
+
+  INL static uint8* WriteInt32ToArray(
+      int field_number, const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteInt64ToArray(
+      int field_number, const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteUInt32ToArray(
+      int field_number, const RepeatedField<uint32>& value, uint8* output);
+  INL static uint8* WriteUInt64ToArray(
+      int field_number, const RepeatedField<uint64>& value, uint8* output);
+  INL static uint8* WriteSInt32ToArray(
+      int field_number, const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteSInt64ToArray(
+      int field_number, const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteFixed32ToArray(
+      int field_number, const RepeatedField<uint32>& value, uint8* output);
+  INL static uint8* WriteFixed64ToArray(
+      int field_number, const RepeatedField<uint64>& value, uint8* output);
+  INL static uint8* WriteSFixed32ToArray(
+      int field_number, const RepeatedField< int32>& value, uint8* output);
+  INL static uint8* WriteSFixed64ToArray(
+      int field_number, const RepeatedField< int64>& value, uint8* output);
+  INL static uint8* WriteFloatToArray(
+      int field_number, const RepeatedField< float>& value, uint8* output);
+  INL static uint8* WriteDoubleToArray(
+      int field_number, const RepeatedField<double>& value, uint8* output);
+  INL static uint8* WriteBoolToArray(
+      int field_number, const RepeatedField<  bool>& value, uint8* output);
+  INL static uint8* WriteEnumToArray(
+      int field_number, const RepeatedField<   int>& value, uint8* output);
+
+  INL static uint8* WriteStringToArray(int field_number, const string& value,
+                                       uint8* target);
+  INL static uint8* WriteBytesToArray(int field_number, const string& value,
+                                      uint8* target);
 
   // Whether to serialize deterministically (e.g., map keys are
   // sorted) is a property of a CodedOutputStream, and in the process
   // of serialization, the "ToArray" variants may be invoked.  But they don't
   // have a CodedOutputStream available, so they get an additional parameter
   // telling them whether to serialize deterministically.
-  INL static uint8* InternalWriteGroupToArray(
-      field_number, const MessageLite& value, bool deterministic, output);
-  INL static uint8* InternalWriteMessageToArray(
-      field_number, const MessageLite& value, bool deterministic, output);
+  template<typename MessageType>
+  INL static uint8* InternalWriteGroupToArray(int field_number,
+                                              const MessageType& value,
+                                              bool deterministic,
+                                              uint8* target);
+  template<typename MessageType>
+  INL static uint8* InternalWriteMessageToArray(int field_number,
+                                                const MessageType& value,
+                                                bool deterministic,
+                                                uint8* target);
 
   // Like above, but de-virtualize the call to SerializeWithCachedSizes().  The
   // pointer must point at an instance of MessageType, *not* a subclass (or
   // the subclass must not override SerializeWithCachedSizes()).
-  template<typename MessageType>
-  INL static uint8* InternalWriteGroupNoVirtualToArray(
-    field_number, const MessageType& value, bool deterministic, output);
-  template<typename MessageType>
+  template <typename MessageType>
+  INL static uint8* InternalWriteGroupNoVirtualToArray(int field_number,
+                                                       const MessageType& value,
+                                                       bool deterministic,
+                                                       uint8* target);
+  template <typename MessageType>
   INL static uint8* InternalWriteMessageNoVirtualToArray(
-    field_number, const MessageType& value, bool deterministic, output);
+      int field_number, const MessageType& value, bool deterministic,
+      uint8* target);
 
   // For backward-compatibility, the last four methods also have versions
   // that are non-deterministic always.
-  INL static uint8* WriteGroupToArray(
-      field_number, const MessageLite& value, output) {
-    return InternalWriteGroupToArray(field_number_arg, value, false, target);
+  INL static uint8* WriteGroupToArray(int field_number,
+                                      const MessageLite& value, uint8* target) {
+    return InternalWriteGroupToArray(field_number, value, false, target);
   }
-  INL static uint8* WriteMessageToArray(
-      field_number, const MessageLite& value, output) {
-    return InternalWriteMessageToArray(field_number_arg, value, false, target);
+  INL static uint8* WriteMessageToArray(int field_number,
+                                        const MessageLite& value,
+                                        uint8* target) {
+    return InternalWriteMessageToArray(field_number, value, false, target);
   }
-  template<typename MessageType>
-  INL static uint8* WriteGroupNoVirtualToArray(
-      field_number, const MessageType& value, output) {
-    return InternalWriteGroupNoVirtualToArray(field_number_arg, value, false,
+  template <typename MessageType>
+  INL static uint8* WriteGroupNoVirtualToArray(int field_number,
+                                               const MessageType& value,
+                                               uint8* target) {
+    return InternalWriteGroupNoVirtualToArray(field_number, value, false,
                                               target);
   }
-  template<typename MessageType>
-  INL static uint8* WriteMessageNoVirtualToArray(
-      field_number, const MessageType& value, output) {
-    return InternalWriteMessageNoVirtualToArray(field_number_arg, value, false,
+  template <typename MessageType>
+  INL static uint8* WriteMessageNoVirtualToArray(int field_number,
+                                                 const MessageType& value,
+                                                 uint8* target) {
+    return InternalWriteMessageNoVirtualToArray(field_number, value, false,
                                                 target);
   }
 
-#undef output
-#undef input
 #undef INL
 
-#undef field_number
-
   // Compute the byte size of a field.  The XxSize() functions do NOT include
   // the tag, so you must also call TagSize().  (This is because, for repeated
   // fields, you should only call TagSize() once and multiply it by the element
@@ -547,13 +671,13 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   static inline size_t SInt64Size  ( int64 value);
   static inline size_t EnumSize    (   int value);
 
-  static        size_t Int32Size (const RepeatedField< int32>& value);
-  static inline size_t Int64Size (const RepeatedField< int64>& value);
-  static        size_t UInt32Size(const RepeatedField<uint32>& value);
-  static inline size_t UInt64Size(const RepeatedField<uint64>& value);
-  static        size_t SInt32Size(const RepeatedField< int32>& value);
-  static inline size_t SInt64Size(const RepeatedField< int64>& value);
-  static        size_t EnumSize  (const RepeatedField<   int>& value);
+  static size_t Int32Size (const RepeatedField< int32>& value);
+  static size_t Int64Size (const RepeatedField< int64>& value);
+  static size_t UInt32Size(const RepeatedField<uint32>& value);
+  static size_t UInt64Size(const RepeatedField<uint64>& value);
+  static size_t SInt32Size(const RepeatedField< int32>& value);
+  static size_t SInt64Size(const RepeatedField< int64>& value);
+  static size_t EnumSize  (const RepeatedField<   int>& value);
 
   // These types always have the same size.
   static const size_t kFixed32Size  = 4;
@@ -567,8 +691,10 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   static inline size_t StringSize(const string& value);
   static inline size_t BytesSize (const string& value);
 
-  static inline size_t GroupSize  (const MessageLite& value);
-  static inline size_t MessageSize(const MessageLite& value);
+  template<typename MessageType>
+  static inline size_t GroupSize  (const MessageType& value);
+  template<typename MessageType>
+  static inline size_t MessageSize(const MessageType& value);
 
   // Like above, but de-virtualize the call to ByteSize().  The
   // pointer must point at an instance of MessageType, *not* a subclass (or
@@ -586,7 +712,8 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
   // A helper method for the repeated primitive reader. This method has
   // optimizations for primitive types that have fixed size on the wire, and
   // can be read using potentially faster paths.
-  template <typename CType, enum FieldType DeclaredType> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
+  template <typename CType, enum FieldType DeclaredType>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
   static bool ReadRepeatedFixedSizePrimitive(
       int tag_size,
       uint32 tag,
@@ -594,9 +721,10 @@ class LIBPROTOBUF_EXPORT WireFormatLite {
       RepeatedField<CType>* value);
 
   // Like ReadRepeatedFixedSizePrimitive but for packed primitive fields.
-  template <typename CType, enum FieldType DeclaredType> GOOGLE_ATTRIBUTE_ALWAYS_INLINE
-  static bool ReadPackedFixedSizePrimitive(google::protobuf::io::CodedInputStream* input,
-                                           RepeatedField<CType>* value);
+  template <typename CType, enum FieldType DeclaredType>
+  GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+  static bool ReadPackedFixedSizePrimitive(
+      google::protobuf::io::CodedInputStream* input, RepeatedField<CType>* value);
 
   static const CppType kFieldTypeToCppTypeMap[];
   static const WireFormatLite::WireType kWireTypeForFieldType[];
@@ -666,7 +794,7 @@ inline int WireFormatLite::GetTagFieldNumber(uint32 tag) {
 inline size_t WireFormatLite::TagSize(int field_number,
                                       WireFormatLite::FieldType type) {
   size_t result = io::CodedOutputStream::VarintSize32(
-    field_number << kTagTypeBits);
+    static_cast<uint32>(field_number << kTagTypeBits));
   if (type == TYPE_GROUP) {
     // Groups have both a start and an end tag.
     return result * 2;
@@ -725,20 +853,24 @@ inline double WireFormatLite::DecodeDouble(uint64 value) {
 
 inline uint32 WireFormatLite::ZigZagEncode32(int32 n) {
   // Note:  the right-shift must be arithmetic
-  return (static_cast<uint32>(n) << 1) ^ (n >> 31);
+  // Note:  left shift must be unsigned because of overflow
+  return (static_cast<uint32>(n) << 1) ^ static_cast<uint32>(n >> 31);
 }
 
 inline int32 WireFormatLite::ZigZagDecode32(uint32 n) {
-  return (n >> 1) ^ -static_cast<int32>(n & 1);
+  // Note:  Using unsigned types prevent undefined behavior
+  return static_cast<int32>((n >> 1) ^ (~(n & 1) + 1));
 }
 
 inline uint64 WireFormatLite::ZigZagEncode64(int64 n) {
   // Note:  the right-shift must be arithmetic
-  return (static_cast<uint64>(n) << 1) ^ (n >> 63);
+  // Note:  left shift must be unsigned because of overflow
+  return (static_cast<uint64>(n) << 1) ^ static_cast<uint64>(n >> 63);
 }
 
 inline int64 WireFormatLite::ZigZagDecode64(uint64 n) {
-  return (n >> 1) ^ -static_cast<int64>(n & 1);
+  // Note:  Using unsigned types prevent undefined behavior
+  return static_cast<int64>((n >> 1) ^ (~(n & 1) + 1));
 }
 
 // String is for UTF-8 text only, but, even so, ReadString() can simply
diff --git a/src/google/protobuf/wire_format_lite_inl.h b/src/google/protobuf/wire_format_lite_inl.h
index aa3bb3a6..6cd2c2fb 100644
--- a/src/google/protobuf/wire_format_lite_inl.h
+++ b/src/google/protobuf/wire_format_lite_inl.h
@@ -36,11 +36,7 @@
 #ifndef GOOGLE_PROTOBUF_WIRE_FORMAT_LITE_INL_H__
 #define GOOGLE_PROTOBUF_WIRE_FORMAT_LITE_INL_H__
 
-#ifdef _MSC_VER
-// This is required for min/max on VS2013 only.
 #include <algorithm>
-#endif
-
 #include <string>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/logging.h>
@@ -272,7 +268,7 @@ inline bool WireFormatLite::ReadRepeatedFixedSizePrimitive(
   if (size > 0) {
     const uint8* buffer = reinterpret_cast<const uint8*>(void_pointer);
     // The number of bytes each type occupies on the wire.
-    const int per_value_size = tag_size + sizeof(value);
+    const int per_value_size = tag_size + static_cast<int>(sizeof(value));
 
     // parentheses around (std::min) prevents macro expansion of min(...)
     int elements_available =
@@ -348,8 +344,8 @@ inline bool WireFormatLite::ReadPackedFixedSizePrimitive(
   int length;
   if (!input->ReadVarintSizeAsInt(&length)) return false;
   const int old_entries = values->size();
-  const int new_entries = length / sizeof(CType);
-  const int new_bytes = new_entries * sizeof(CType);
+  const int new_entries = length / static_cast<int>(sizeof(CType));
+  const int new_bytes = new_entries * static_cast<int>(sizeof(CType));
   if (new_bytes != length) return false;
   // We would *like* to pre-allocate the buffer to write into (for
   // speed), but *must* avoid performing a very large allocation due
@@ -430,49 +426,12 @@ bool WireFormatLite::ReadPackedPrimitiveNoInline(io::CodedInputStream* input,
 }
 
 
-
-inline bool WireFormatLite::ReadGroup(int field_number,
-                                      io::CodedInputStream* input,
-                                      MessageLite* value) {
-  if (!input->IncrementRecursionDepth()) return false;
-  if (!value->MergePartialFromCodedStream(input)) return false;
-  input->DecrementRecursionDepth();
-  // Make sure the last thing read was an end tag for this group.
-  if (!input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP))) {
-    return false;
-  }
-  return true;
-}
-inline bool WireFormatLite::ReadMessage(io::CodedInputStream* input,
-                                        MessageLite* value) {
-  int length;
-  if (!input->ReadVarintSizeAsInt(&length)) return false;
-  std::pair<io::CodedInputStream::Limit, int> p =
-      input->IncrementRecursionDepthAndPushLimit(length);
-  if (p.second < 0 || !value->MergePartialFromCodedStream(input)) return false;
-  // Make sure that parsing stopped when the limit was hit, not at an endgroup
-  // tag.
-  return input->DecrementRecursionDepthAndPopLimit(p.first);
-}
-
-// We name the template parameter something long and extremely unlikely to occur
-// elsewhere because a *qualified* member access expression designed to avoid
-// virtual dispatch, C++03 [basic.lookup.classref] 3.4.5/4 requires that the
-// name of the qualifying class to be looked up both in the context of the full
-// expression (finding the template parameter) and in the context of the object
-// whose member we are accessing. This could potentially find a nested type
-// within that object. The standard goes on to require these names to refer to
-// the same entity, which this collision would violate. The lack of a safe way
-// to avoid this collision appears to be a defect in the standard, but until it
-// is corrected, we choose the name to avoid accidental collisions.
-template<typename MessageType_WorkAroundCppLookupDefect>
-inline bool WireFormatLite::ReadGroupNoVirtual(
+template<typename MessageType>
+inline bool WireFormatLite::ReadGroup(
     int field_number, io::CodedInputStream* input,
-    MessageType_WorkAroundCppLookupDefect* value) {
+    MessageType* value) {
   if (!input->IncrementRecursionDepth()) return false;
-  if (!value->
-      MessageType_WorkAroundCppLookupDefect::MergePartialFromCodedStream(input))
-    return false;
+  if (!value->MergePartialFromCodedStream(input)) return false;
   input->UnsafeDecrementRecursionDepth();
   // Make sure the last thing read was an end tag for this group.
   if (!input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP))) {
@@ -480,39 +439,18 @@ inline bool WireFormatLite::ReadGroupNoVirtual(
   }
   return true;
 }
-template<typename MessageType_WorkAroundCppLookupDefect>
-inline bool WireFormatLite::ReadGroupNoVirtualNoRecursionDepth(
-    int field_number, io::CodedInputStream* input,
-    MessageType_WorkAroundCppLookupDefect* value) {
-  return value->MessageType_WorkAroundCppLookupDefect::
-             MergePartialFromCodedStream(input) &&
-         input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP));
-}
-template<typename MessageType_WorkAroundCppLookupDefect>
-inline bool WireFormatLite::ReadMessageNoVirtual(
-    io::CodedInputStream* input, MessageType_WorkAroundCppLookupDefect* value) {
+template<typename MessageType>
+inline bool WireFormatLite::ReadMessage(
+    io::CodedInputStream* input, MessageType* value) {
   int length;
   if (!input->ReadVarintSizeAsInt(&length)) return false;
   std::pair<io::CodedInputStream::Limit, int> p =
       input->IncrementRecursionDepthAndPushLimit(length);
-  if (p.second < 0 || !value->
-      MessageType_WorkAroundCppLookupDefect::MergePartialFromCodedStream(input))
-    return false;
+  if (p.second < 0 || !value->MergePartialFromCodedStream(input)) return false;
   // Make sure that parsing stopped when the limit was hit, not at an endgroup
   // tag.
   return input->DecrementRecursionDepthAndPopLimit(p.first);
 }
-template<typename MessageType_WorkAroundCppLookupDefect>
-inline bool WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
-    io::CodedInputStream* input, MessageType_WorkAroundCppLookupDefect* value) {
-  io::CodedInputStream::Limit old_limit = input->ReadLengthAndPushLimit();
-  if (!value->
-      MessageType_WorkAroundCppLookupDefect::MergePartialFromCodedStream(input))
-    return false;
-  // Make sure that parsing stopped when the limit was hit, not at an endgroup
-  // tag.
-  return input->CheckEntireMessageConsumedAndPopLimit(old_limit);
-}
 
 // ===================================================================
 
@@ -671,6 +609,98 @@ inline uint8* WireFormatLite::WriteEnumNoTagToArray(int value,
   return io::CodedOutputStream::WriteVarint32SignExtendedToArray(value, target);
 }
 
+template<typename T>
+inline uint8* WireFormatLite::WritePrimitiveNoTagToArray(
+      const RepeatedField<T>& value,
+      uint8* (*Writer)(T, uint8*), uint8* target) {
+  const int n = value.size();
+  GOOGLE_DCHECK_GT(n, 0);
+
+  const T* ii = value.unsafe_data();
+  int i = 0;
+  do {
+    target = Writer(ii[i], target);
+  } while (++i < n);
+
+  return target;
+}
+
+template<typename T>
+inline uint8* WireFormatLite::WriteFixedNoTagToArray(
+      const RepeatedField<T>& value,
+      uint8* (*Writer)(T, uint8*), uint8* target) {
+#if defined(PROTOBUF_LITTLE_ENDIAN)
+  (void) Writer;
+
+  const int n = value.size();
+  GOOGLE_DCHECK_GT(n, 0);
+
+  const T* ii = value.unsafe_data();
+  const int bytes = n * static_cast<int>(sizeof(ii[0]));
+  memcpy(target, ii, static_cast<size_t>(bytes));
+  return target + bytes;
+#else
+  return WritePrimitiveNoTagToArray(value, Writer, target);
+#endif
+}
+
+inline uint8* WireFormatLite::WriteInt32NoTagToArray(
+    const RepeatedField< int32>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteInt32NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteInt64NoTagToArray(
+    const RepeatedField< int64>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteInt64NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteUInt32NoTagToArray(
+    const RepeatedField<uint32>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteUInt32NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteUInt64NoTagToArray(
+    const RepeatedField<uint64>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteUInt64NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteSInt32NoTagToArray(
+    const RepeatedField< int32>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteSInt32NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteSInt64NoTagToArray(
+    const RepeatedField< int64>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteSInt64NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteFixed32NoTagToArray(
+    const RepeatedField<uint32>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteFixed32NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteFixed64NoTagToArray(
+    const RepeatedField<uint64>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteFixed64NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteSFixed32NoTagToArray(
+    const RepeatedField< int32>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteSFixed32NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteSFixed64NoTagToArray(
+    const RepeatedField< int64>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteSFixed64NoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteFloatNoTagToArray(
+    const RepeatedField< float>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteFloatNoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteDoubleNoTagToArray(
+    const RepeatedField<double>& value, uint8* target) {
+  return WriteFixedNoTagToArray(value, WriteDoubleNoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteBoolNoTagToArray(
+    const RepeatedField<  bool>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteBoolNoTagToArray, target);
+}
+inline uint8* WireFormatLite::WriteEnumNoTagToArray(
+    const RepeatedField<   int>& value, uint8* target) {
+  return WritePrimitiveNoTagToArray(value, WriteEnumNoTagToArray, target);
+}
+
 inline uint8* WireFormatLite::WriteInt32ToArray(int field_number,
                                                 int32 value,
                                                 uint8* target) {
@@ -756,6 +786,85 @@ inline uint8* WireFormatLite::WriteEnumToArray(int field_number,
   return WriteEnumNoTagToArray(value, target);
 }
 
+template<typename T>
+inline uint8* WireFormatLite::WritePrimitiveToArray(
+    int field_number,
+    const RepeatedField<T>& value,
+    uint8* (*Writer)(int, T, uint8*), uint8* target) {
+  const int n = value.size();
+  if (n == 0) {
+    return target;
+  }
+
+  const T* ii = value.unsafe_data();
+  int i = 0;
+  do {
+    target = Writer(field_number, ii[i], target);
+  } while (++i < n);
+
+  return target;
+}
+
+inline uint8* WireFormatLite::WriteInt32ToArray(
+    int field_number, const RepeatedField< int32>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteInt32ToArray, target);
+}
+inline uint8* WireFormatLite::WriteInt64ToArray(
+    int field_number, const RepeatedField< int64>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteInt64ToArray, target);
+}
+inline uint8* WireFormatLite::WriteUInt32ToArray(
+    int field_number, const RepeatedField<uint32>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteUInt32ToArray, target);
+}
+inline uint8* WireFormatLite::WriteUInt64ToArray(
+    int field_number, const RepeatedField<uint64>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteUInt64ToArray, target);
+}
+inline uint8* WireFormatLite::WriteSInt32ToArray(
+    int field_number, const RepeatedField< int32>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteSInt32ToArray, target);
+}
+inline uint8* WireFormatLite::WriteSInt64ToArray(
+    int field_number, const RepeatedField< int64>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteSInt64ToArray, target);
+}
+inline uint8* WireFormatLite::WriteFixed32ToArray(
+    int field_number, const RepeatedField<uint32>& value, uint8* target) {
+  return WritePrimitiveToArray(
+      field_number, value, WriteFixed32ToArray, target);
+}
+inline uint8* WireFormatLite::WriteFixed64ToArray(
+    int field_number, const RepeatedField<uint64>& value, uint8* target) {
+  return WritePrimitiveToArray(
+      field_number, value, WriteFixed64ToArray, target);
+}
+inline uint8* WireFormatLite::WriteSFixed32ToArray(
+    int field_number, const RepeatedField< int32>& value, uint8* target) {
+  return WritePrimitiveToArray(
+      field_number, value, WriteSFixed32ToArray, target);
+}
+inline uint8* WireFormatLite::WriteSFixed64ToArray(
+    int field_number, const RepeatedField< int64>& value, uint8* target) {
+  return WritePrimitiveToArray(
+      field_number, value, WriteSFixed64ToArray, target);
+}
+inline uint8* WireFormatLite::WriteFloatToArray(
+    int field_number, const RepeatedField< float>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteFloatToArray, target);
+}
+inline uint8* WireFormatLite::WriteDoubleToArray(
+    int field_number, const RepeatedField<double>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteDoubleToArray, target);
+}
+inline uint8* WireFormatLite::WriteBoolToArray(
+    int field_number, const RepeatedField<  bool>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteBoolToArray, target);
+}
+inline uint8* WireFormatLite::WriteEnumToArray(
+    int field_number, const RepeatedField<   int>& value, uint8* target) {
+  return WritePrimitiveToArray(field_number, value, WriteEnumToArray, target);
+}
 inline uint8* WireFormatLite::WriteStringToArray(int field_number,
                                                  const string& value,
                                                  uint8* target) {
@@ -774,19 +883,21 @@ inline uint8* WireFormatLite::WriteBytesToArray(int field_number,
 }
 
 
+template<typename MessageType>
 inline uint8* WireFormatLite::InternalWriteGroupToArray(
-    int field_number, const MessageLite& value, bool deterministic,
+    int field_number, const MessageType& value, bool deterministic,
     uint8* target) {
   target = WriteTagToArray(field_number, WIRETYPE_START_GROUP, target);
   target = value.InternalSerializeWithCachedSizesToArray(deterministic, target);
   return WriteTagToArray(field_number, WIRETYPE_END_GROUP, target);
 }
+template<typename MessageType>
 inline uint8* WireFormatLite::InternalWriteMessageToArray(
-    int field_number, const MessageLite& value, bool deterministic,
+    int field_number, const MessageType& value, bool deterministic,
     uint8* target) {
   target = WriteTagToArray(field_number, WIRETYPE_LENGTH_DELIMITED, target);
   target = io::CodedOutputStream::WriteVarint32ToArray(
-    value.GetCachedSize(), target);
+    static_cast<uint32>(value.GetCachedSize()), target);
   return value.InternalSerializeWithCachedSizesToArray(deterministic, target);
 }
 
@@ -797,7 +908,8 @@ inline uint8* WireFormatLite::InternalWriteGroupNoVirtualToArray(
     int field_number, const MessageType_WorkAroundCppLookupDefect& value,
     bool deterministic, uint8* target) {
   target = WriteTagToArray(field_number, WIRETYPE_START_GROUP, target);
-  target = value.InternalSerializeWithCachedSizesToArray(deterministic, target);
+  target = value.MessageType_WorkAroundCppLookupDefect::
+      InternalSerializeWithCachedSizesToArray(deterministic, target);
   return WriteTagToArray(field_number, WIRETYPE_END_GROUP, target);
 }
 template<typename MessageType_WorkAroundCppLookupDefect>
@@ -806,8 +918,11 @@ inline uint8* WireFormatLite::InternalWriteMessageNoVirtualToArray(
     bool deterministic, uint8* target) {
   target = WriteTagToArray(field_number, WIRETYPE_LENGTH_DELIMITED, target);
   target = io::CodedOutputStream::WriteVarint32ToArray(
-    value.MessageType_WorkAroundCppLookupDefect::GetCachedSize(), target);
-  return value.InternalSerializeWithCachedSizesToArray(deterministic, target);
+        static_cast<uint32>(
+            value.MessageType_WorkAroundCppLookupDefect::GetCachedSize()),
+        target);
+  return value.MessageType_WorkAroundCppLookupDefect::
+      InternalSerializeWithCachedSizesToArray(deterministic, target);
 }
 
 // ===================================================================
@@ -842,10 +957,12 @@ inline size_t WireFormatLite::BytesSize(const string& value) {
 }
 
 
-inline size_t WireFormatLite::GroupSize(const MessageLite& value) {
+template<typename MessageType>
+inline size_t WireFormatLite::GroupSize(const MessageType& value) {
   return value.ByteSizeLong();
 }
-inline size_t WireFormatLite::MessageSize(const MessageLite& value) {
+template<typename MessageType>
+inline size_t WireFormatLite::MessageSize(const MessageType& value) {
   return LengthDelimitedSize(value.ByteSizeLong());
 }
 
@@ -872,33 +989,6 @@ inline size_t WireFormatLite::LengthDelimitedSize(size_t length) {
       static_cast<uint32>(length));
 }
 
-size_t WireFormatLite::Int64Size (const RepeatedField< int64>& value) {
-  size_t out = 0;
-  const int n = value.size();
-  for (int i = 0; i < n; i++) {
-    out += Int64Size(value.Get(i));
-  }
-  return out;
-}
-
-size_t WireFormatLite::UInt64Size(const RepeatedField<uint64>& value) {
-  size_t out = 0;
-  const int n = value.size();
-  for (int i = 0; i < n; i++) {
-    out += UInt64Size(value.Get(i));
-  }
-  return out;
-}
-
-size_t WireFormatLite::SInt64Size(const RepeatedField< int64>& value) {
-  size_t out = 0;
-  const int n = value.size();
-  for (int i = 0; i < n; i++) {
-    out += SInt64Size(value.Get(i));
-  }
-  return out;
-}
-
 }  // namespace internal
 }  // namespace protobuf
 
diff --git a/src/google/protobuf/wire_format_unittest.cc b/src/google/protobuf/wire_format_unittest.cc
index 897fec00..736a1282 100644
--- a/src/google/protobuf/wire_format_unittest.cc
+++ b/src/google/protobuf/wire_format_unittest.cc
@@ -1029,6 +1029,29 @@ TEST_F(WireFormatInvalidInputTest, InvalidSubMessage) {
   EXPECT_FALSE(message.ParseFromString(MakeInvalidEmbeddedMessage("\017", 1)));
 }
 
+TEST_F(WireFormatInvalidInputTest, InvalidMessageWithExtraZero) {
+  string data;
+  {
+    // Serialize a valid proto
+    unittest::TestAllTypes message;
+    message.set_optional_int32(1);
+    message.SerializeToString(&data);
+    data.push_back(0);  // Append invalid zero tag
+  }
+
+  // Control case.
+  {
+    io::ArrayInputStream ais(data.data(), data.size());
+    io::CodedInputStream is(&ais);
+    unittest::TestAllTypes message;
+    // It should fail but currently passes.
+    EXPECT_TRUE(message.MergePartialFromCodedStream(&is));
+    // Parsing from the string should fail.
+    EXPECT_FALSE(message.ParseFromString(data));
+  }
+}
+
+
 TEST_F(WireFormatInvalidInputTest, InvalidGroup) {
   unittest::TestAllTypes message;
 
@@ -1413,6 +1436,7 @@ TEST(RepeatedVarint, Enum) {
   EXPECT_EQ(expected, WireFormatLite::EnumSize(v));
 }
 
+
 }  // namespace
 }  // namespace internal
 }  // namespace protobuf
diff --git a/src/google/protobuf/wrappers.pb.cc b/src/google/protobuf/wrappers.pb.cc
index d614de9d..ffd905f5 100644
--- a/src/google/protobuf/wrappers.pb.cc
+++ b/src/google/protobuf/wrappers.pb.cc
@@ -1,190 +1,315 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
-#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION
 #include <google/protobuf/wrappers.pb.h>
 
 #include <algorithm>
 
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/stubs/port.h>
-#include <google/protobuf/stubs/once.h>
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/wire_format_lite_inl.h>
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/generated_message_reflection.h>
 #include <google/protobuf/reflection_ops.h>
 #include <google/protobuf/wire_format.h>
+// This is a temporary google only hack
+#ifdef GOOGLE_PROTOBUF_ENFORCE_UNIQUENESS
+#include "third_party/protobuf/version.h"
+#endif
 // @@protoc_insertion_point(includes)
 
 namespace google {
 namespace protobuf {
-class DoubleValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<DoubleValue> {
+class DoubleValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<DoubleValue>
+      _instance;
 } _DoubleValue_default_instance_;
-class FloatValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<FloatValue> {
+class FloatValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<FloatValue>
+      _instance;
 } _FloatValue_default_instance_;
-class Int64ValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Int64Value> {
+class Int64ValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Int64Value>
+      _instance;
 } _Int64Value_default_instance_;
-class UInt64ValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<UInt64Value> {
+class UInt64ValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<UInt64Value>
+      _instance;
 } _UInt64Value_default_instance_;
-class Int32ValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<Int32Value> {
+class Int32ValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<Int32Value>
+      _instance;
 } _Int32Value_default_instance_;
-class UInt32ValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<UInt32Value> {
+class UInt32ValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<UInt32Value>
+      _instance;
 } _UInt32Value_default_instance_;
-class BoolValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<BoolValue> {
+class BoolValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<BoolValue>
+      _instance;
 } _BoolValue_default_instance_;
-class StringValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<StringValue> {
+class StringValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<StringValue>
+      _instance;
 } _StringValue_default_instance_;
-class BytesValueDefaultTypeInternal : public ::google::protobuf::internal::ExplicitlyConstructed<BytesValue> {
+class BytesValueDefaultTypeInternal {
+ public:
+  ::google::protobuf::internal::ExplicitlyConstructed<BytesValue>
+      _instance;
 } _BytesValue_default_instance_;
-
+}  // namespace protobuf
+}  // namespace google
 namespace protobuf_google_2fprotobuf_2fwrappers_2eproto {
+static void InitDefaultsDoubleValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
 
+  {
+    void* ptr = &::google::protobuf::_DoubleValue_default_instance_;
+    new (ptr) ::google::protobuf::DoubleValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::DoubleValue::InitAsDefaultInstance();
+}
 
-namespace {
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_DoubleValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsDoubleValue}, {}};
 
-::google::protobuf::Metadata file_level_metadata[9];
+static void InitDefaultsFloatValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_FloatValue_default_instance_;
+    new (ptr) ::google::protobuf::FloatValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::FloatValue::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_FloatValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsFloatValue}, {}};
+
+static void InitDefaultsInt64Value() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Int64Value_default_instance_;
+    new (ptr) ::google::protobuf::Int64Value();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Int64Value::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Int64Value =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsInt64Value}, {}};
+
+static void InitDefaultsUInt64Value() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_UInt64Value_default_instance_;
+    new (ptr) ::google::protobuf::UInt64Value();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::UInt64Value::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_UInt64Value =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsUInt64Value}, {}};
+
+static void InitDefaultsInt32Value() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_Int32Value_default_instance_;
+    new (ptr) ::google::protobuf::Int32Value();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::Int32Value::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_Int32Value =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsInt32Value}, {}};
+
+static void InitDefaultsUInt32Value() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_UInt32Value_default_instance_;
+    new (ptr) ::google::protobuf::UInt32Value();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::UInt32Value::InitAsDefaultInstance();
+}
 
-}  // namespace
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_UInt32Value =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsUInt32Value}, {}};
 
-const ::google::protobuf::uint32 TableStruct::offsets[] = {
+static void InitDefaultsBoolValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_BoolValue_default_instance_;
+    new (ptr) ::google::protobuf::BoolValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::BoolValue::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_BoolValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsBoolValue}, {}};
+
+static void InitDefaultsStringValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_StringValue_default_instance_;
+    new (ptr) ::google::protobuf::StringValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::StringValue::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_StringValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsStringValue}, {}};
+
+static void InitDefaultsBytesValue() {
+  GOOGLE_PROTOBUF_VERIFY_VERSION;
+
+  {
+    void* ptr = &::google::protobuf::_BytesValue_default_instance_;
+    new (ptr) ::google::protobuf::BytesValue();
+    ::google::protobuf::internal::OnShutdownDestroyMessage(ptr);
+  }
+  ::google::protobuf::BytesValue::InitAsDefaultInstance();
+}
+
+LIBPROTOBUF_EXPORT ::google::protobuf::internal::SCCInfo<0> scc_info_BytesValue =
+    {{ATOMIC_VAR_INIT(::google::protobuf::internal::SCCInfoBase::kUninitialized), 0, InitDefaultsBytesValue}, {}};
+
+void InitDefaults() {
+  ::google::protobuf::internal::InitSCC(&scc_info_DoubleValue.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_FloatValue.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Int64Value.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_UInt64Value.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_Int32Value.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_UInt32Value.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_BoolValue.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_StringValue.base);
+  ::google::protobuf::internal::InitSCC(&scc_info_BytesValue.base);
+}
+
+::google::protobuf::Metadata file_level_metadata[9];
+
+const ::google::protobuf::uint32 TableStruct::offsets[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DoubleValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DoubleValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(DoubleValue, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::DoubleValue, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FloatValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FloatValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(FloatValue, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::FloatValue, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Int64Value, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Int64Value, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Int64Value, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Int64Value, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UInt64Value, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UInt64Value, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UInt64Value, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UInt64Value, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Int32Value, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Int32Value, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(Int32Value, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::Int32Value, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UInt32Value, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UInt32Value, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(UInt32Value, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::UInt32Value, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(BoolValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::BoolValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(BoolValue, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::BoolValue, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(StringValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::StringValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(StringValue, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::StringValue, value_),
   ~0u,  // no _has_bits_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(BytesValue, _internal_metadata_),
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::BytesValue, _internal_metadata_),
   ~0u,  // no _extensions_
   ~0u,  // no _oneof_case_
-  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(BytesValue, value_),
+  ~0u,  // no _weak_field_map_
+  GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET(::google::protobuf::BytesValue, value_),
 };
-
-static const ::google::protobuf::internal::MigrationSchema schemas[] = {
-  { 0, -1, sizeof(DoubleValue)},
-  { 5, -1, sizeof(FloatValue)},
-  { 10, -1, sizeof(Int64Value)},
-  { 15, -1, sizeof(UInt64Value)},
-  { 20, -1, sizeof(Int32Value)},
-  { 25, -1, sizeof(UInt32Value)},
-  { 30, -1, sizeof(BoolValue)},
-  { 35, -1, sizeof(StringValue)},
-  { 40, -1, sizeof(BytesValue)},
+static const ::google::protobuf::internal::MigrationSchema schemas[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
+  { 0, -1, sizeof(::google::protobuf::DoubleValue)},
+  { 6, -1, sizeof(::google::protobuf::FloatValue)},
+  { 12, -1, sizeof(::google::protobuf::Int64Value)},
+  { 18, -1, sizeof(::google::protobuf::UInt64Value)},
+  { 24, -1, sizeof(::google::protobuf::Int32Value)},
+  { 30, -1, sizeof(::google::protobuf::UInt32Value)},
+  { 36, -1, sizeof(::google::protobuf::BoolValue)},
+  { 42, -1, sizeof(::google::protobuf::StringValue)},
+  { 48, -1, sizeof(::google::protobuf::BytesValue)},
 };
 
 static ::google::protobuf::Message const * const file_default_instances[] = {
-  reinterpret_cast<const ::google::protobuf::Message*>(&_DoubleValue_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_FloatValue_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Int64Value_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_UInt64Value_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_Int32Value_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_UInt32Value_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_BoolValue_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_StringValue_default_instance_),
-  reinterpret_cast<const ::google::protobuf::Message*>(&_BytesValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_DoubleValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_FloatValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Int64Value_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_UInt64Value_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_Int32Value_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_UInt32Value_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_BoolValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_StringValue_default_instance_),
+  reinterpret_cast<const ::google::protobuf::Message*>(&::google::protobuf::_BytesValue_default_instance_),
 };
 
-namespace {
-
 void protobuf_AssignDescriptors() {
   AddDescriptors();
-  ::google::protobuf::MessageFactory* factory = NULL;
   AssignDescriptors(
-      "google/protobuf/wrappers.proto", schemas, file_default_instances, TableStruct::offsets, factory,
+      "google/protobuf/wrappers.proto", schemas, file_default_instances, TableStruct::offsets,
       file_level_metadata, NULL, NULL);
 }
 
 void protobuf_AssignDescriptorsOnce() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &protobuf_AssignDescriptors);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, protobuf_AssignDescriptors);
 }
 
-void protobuf_RegisterTypes(const ::std::string&) GOOGLE_ATTRIBUTE_COLD;
+void protobuf_RegisterTypes(const ::std::string&) GOOGLE_PROTOBUF_ATTRIBUTE_COLD;
 void protobuf_RegisterTypes(const ::std::string&) {
   protobuf_AssignDescriptorsOnce();
   ::google::protobuf::internal::RegisterAllTypes(file_level_metadata, 9);
 }
 
-}  // namespace
-
-void TableStruct::Shutdown() {
-  _DoubleValue_default_instance_.Shutdown();
-  delete file_level_metadata[0].reflection;
-  _FloatValue_default_instance_.Shutdown();
-  delete file_level_metadata[1].reflection;
-  _Int64Value_default_instance_.Shutdown();
-  delete file_level_metadata[2].reflection;
-  _UInt64Value_default_instance_.Shutdown();
-  delete file_level_metadata[3].reflection;
-  _Int32Value_default_instance_.Shutdown();
-  delete file_level_metadata[4].reflection;
-  _UInt32Value_default_instance_.Shutdown();
-  delete file_level_metadata[5].reflection;
-  _BoolValue_default_instance_.Shutdown();
-  delete file_level_metadata[6].reflection;
-  _StringValue_default_instance_.Shutdown();
-  delete file_level_metadata[7].reflection;
-  _BytesValue_default_instance_.Shutdown();
-  delete file_level_metadata[8].reflection;
-}
-
-void TableStruct::InitDefaultsImpl() {
-  GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-  ::google::protobuf::internal::InitProtobufDefaults();
-  _DoubleValue_default_instance_.DefaultConstruct();
-  _FloatValue_default_instance_.DefaultConstruct();
-  _Int64Value_default_instance_.DefaultConstruct();
-  _UInt64Value_default_instance_.DefaultConstruct();
-  _Int32Value_default_instance_.DefaultConstruct();
-  _UInt32Value_default_instance_.DefaultConstruct();
-  _BoolValue_default_instance_.DefaultConstruct();
-  _StringValue_default_instance_.DefaultConstruct();
-  _BytesValue_default_instance_.DefaultConstruct();
-}
-
-void InitDefaults() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &TableStruct::InitDefaultsImpl);
-}
 void AddDescriptorsImpl() {
   InitDefaults();
-  static const char descriptor[] = {
+  static const char descriptor[] GOOGLE_PROTOBUF_ATTRIBUTE_SECTION_VARIABLE(protodesc_cold) = {
       "\n\036google/protobuf/wrappers.proto\022\017google"
       ".protobuf\"\034\n\013DoubleValue\022\r\n\005value\030\001 \001(\001\""
       "\033\n\nFloatValue\022\r\n\005value\030\001 \001(\002\"\033\n\nInt64Val"
@@ -202,51 +327,48 @@ void AddDescriptorsImpl() {
       descriptor, 447);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/wrappers.proto", &protobuf_RegisterTypes);
-  ::google::protobuf::internal::OnShutdown(&TableStruct::Shutdown);
 }
 
 void AddDescriptors() {
-  static GOOGLE_PROTOBUF_DECLARE_ONCE(once);
-  ::google::protobuf::GoogleOnceInit(&once, &AddDescriptorsImpl);
+  static ::google::protobuf::internal::once_flag once;
+  ::google::protobuf::internal::call_once(once, AddDescriptorsImpl);
 }
-// Force AddDescriptors() to be called at static initialization time.
+// Force AddDescriptors() to be called at dynamic initialization time.
 struct StaticDescriptorInitializer {
   StaticDescriptorInitializer() {
     AddDescriptors();
   }
 } static_descriptor_initializer;
-
 }  // namespace protobuf_google_2fprotobuf_2fwrappers_2eproto
-
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
+void DoubleValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int DoubleValue::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 DoubleValue::DoubleValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_DoubleValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.DoubleValue)
 }
 DoubleValue::DoubleValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_DoubleValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.DoubleValue)
 }
 DoubleValue::DoubleValue(const DoubleValue& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.DoubleValue)
@@ -254,7 +376,6 @@ DoubleValue::DoubleValue(const DoubleValue& from)
 
 void DoubleValue::SharedCtor() {
   value_ = 0;
-  _cached_size_ = 0;
 }
 
 DoubleValue::~DoubleValue() {
@@ -263,11 +384,7 @@ DoubleValue::~DoubleValue() {
 }
 
 void DoubleValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void DoubleValue::ArenaDtor(void* object) {
@@ -277,27 +394,27 @@ void DoubleValue::ArenaDtor(void* object) {
 void DoubleValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void DoubleValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* DoubleValue::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[0].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const DoubleValue& DoubleValue::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_DoubleValue.base);
   return *internal_default_instance();
 }
 
-DoubleValue* DoubleValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<DoubleValue>(arena);
-}
 
 void DoubleValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.DoubleValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool DoubleValue::MergePartialFromCodedStream(
@@ -306,14 +423,14 @@ bool DoubleValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.DoubleValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // double value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(9u)) {
+            static_cast< ::google::protobuf::uint8>(9u /* 9 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    double, ::google::protobuf::internal::WireFormatLite::TYPE_DOUBLE>(
@@ -326,12 +443,11 @@ bool DoubleValue::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -348,23 +464,37 @@ failure:
 void DoubleValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.DoubleValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // double value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteDouble(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.DoubleValue)
 }
 
 ::google::protobuf::uint8* DoubleValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.DoubleValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // double value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteDoubleToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.DoubleValue)
   return target;
 }
@@ -373,15 +503,18 @@ size_t DoubleValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.DoubleValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // double value = 1;
   if (this->value() != 0) {
     total_size += 1 + 8;
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -404,6 +537,9 @@ void DoubleValue::MergeFrom(const DoubleValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.DoubleValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -447,62 +583,43 @@ void DoubleValue::UnsafeArenaSwap(DoubleValue* other) {
   InternalSwap(other);
 }
 void DoubleValue::InternalSwap(DoubleValue* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata DoubleValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[0];
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// DoubleValue
-
-// double value = 1;
-void DoubleValue::clear_value() {
-  value_ = 0;
-}
-double DoubleValue::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.DoubleValue.value)
-  return value_;
-}
-void DoubleValue::set_value(double value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.DoubleValue.value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void FloatValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int FloatValue::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 FloatValue::FloatValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_FloatValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.FloatValue)
 }
 FloatValue::FloatValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_FloatValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.FloatValue)
 }
 FloatValue::FloatValue(const FloatValue& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.FloatValue)
@@ -510,7 +627,6 @@ FloatValue::FloatValue(const FloatValue& from)
 
 void FloatValue::SharedCtor() {
   value_ = 0;
-  _cached_size_ = 0;
 }
 
 FloatValue::~FloatValue() {
@@ -519,11 +635,7 @@ FloatValue::~FloatValue() {
 }
 
 void FloatValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void FloatValue::ArenaDtor(void* object) {
@@ -533,27 +645,27 @@ void FloatValue::ArenaDtor(void* object) {
 void FloatValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void FloatValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* FloatValue::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[1].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const FloatValue& FloatValue::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_FloatValue.base);
   return *internal_default_instance();
 }
 
-FloatValue* FloatValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<FloatValue>(arena);
-}
 
 void FloatValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.FloatValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool FloatValue::MergePartialFromCodedStream(
@@ -562,14 +674,14 @@ bool FloatValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.FloatValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // float value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(13u)) {
+            static_cast< ::google::protobuf::uint8>(13u /* 13 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    float, ::google::protobuf::internal::WireFormatLite::TYPE_FLOAT>(
@@ -582,12 +694,11 @@ bool FloatValue::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -604,23 +715,37 @@ failure:
 void FloatValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.FloatValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // float value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteFloat(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.FloatValue)
 }
 
 ::google::protobuf::uint8* FloatValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.FloatValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // float value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteFloatToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.FloatValue)
   return target;
 }
@@ -629,15 +754,18 @@ size_t FloatValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.FloatValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // float value = 1;
   if (this->value() != 0) {
     total_size += 1 + 4;
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -660,6 +788,9 @@ void FloatValue::MergeFrom(const FloatValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.FloatValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -703,62 +834,43 @@ void FloatValue::UnsafeArenaSwap(FloatValue* other) {
   InternalSwap(other);
 }
 void FloatValue::InternalSwap(FloatValue* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata FloatValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[1];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// FloatValue
-
-// float value = 1;
-void FloatValue::clear_value() {
-  value_ = 0;
-}
-float FloatValue::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.FloatValue.value)
-  return value_;
-}
-void FloatValue::set_value(float value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.FloatValue.value)
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void Int64Value::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Int64Value::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 Int64Value::Int64Value()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int64Value.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Int64Value)
 }
 Int64Value::Int64Value(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int64Value.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Int64Value)
 }
 Int64Value::Int64Value(const Int64Value& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Int64Value)
@@ -766,7 +878,6 @@ Int64Value::Int64Value(const Int64Value& from)
 
 void Int64Value::SharedCtor() {
   value_ = GOOGLE_LONGLONG(0);
-  _cached_size_ = 0;
 }
 
 Int64Value::~Int64Value() {
@@ -775,11 +886,7 @@ Int64Value::~Int64Value() {
 }
 
 void Int64Value::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Int64Value::ArenaDtor(void* object) {
@@ -789,27 +896,27 @@ void Int64Value::ArenaDtor(void* object) {
 void Int64Value::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Int64Value::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Int64Value::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[2].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Int64Value& Int64Value::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int64Value.base);
   return *internal_default_instance();
 }
 
-Int64Value* Int64Value::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Int64Value>(arena);
-}
 
 void Int64Value::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Int64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = GOOGLE_LONGLONG(0);
+  _internal_metadata_.Clear();
 }
 
 bool Int64Value::MergePartialFromCodedStream(
@@ -818,14 +925,14 @@ bool Int64Value::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Int64Value)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // int64 value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int64, ::google::protobuf::internal::WireFormatLite::TYPE_INT64>(
@@ -838,12 +945,11 @@ bool Int64Value::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -860,23 +966,37 @@ failure:
 void Int64Value::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Int64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteInt64(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Int64Value)
 }
 
 ::google::protobuf::uint8* Int64Value::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Int64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int64 value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt64ToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Int64Value)
   return target;
 }
@@ -885,6 +1005,11 @@ size_t Int64Value::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Int64Value)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // int64 value = 1;
   if (this->value() != 0) {
     total_size += 1 +
@@ -893,9 +1018,7 @@ size_t Int64Value::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -918,6 +1041,9 @@ void Int64Value::MergeFrom(const Int64Value& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Int64Value)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -961,62 +1087,43 @@ void Int64Value::UnsafeArenaSwap(Int64Value* other) {
   InternalSwap(other);
 }
 void Int64Value::InternalSwap(Int64Value* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Int64Value::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[2];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Int64Value
-
-// int64 value = 1;
-void Int64Value::clear_value() {
-  value_ = GOOGLE_LONGLONG(0);
-}
-::google::protobuf::int64 Int64Value::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Int64Value.value)
-  return value_;
-}
-void Int64Value::set_value(::google::protobuf::int64 value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Int64Value.value)
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void UInt64Value::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int UInt64Value::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 UInt64Value::UInt64Value()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt64Value.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.UInt64Value)
 }
 UInt64Value::UInt64Value(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt64Value.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.UInt64Value)
 }
 UInt64Value::UInt64Value(const UInt64Value& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.UInt64Value)
@@ -1024,7 +1131,6 @@ UInt64Value::UInt64Value(const UInt64Value& from)
 
 void UInt64Value::SharedCtor() {
   value_ = GOOGLE_ULONGLONG(0);
-  _cached_size_ = 0;
 }
 
 UInt64Value::~UInt64Value() {
@@ -1033,11 +1139,7 @@ UInt64Value::~UInt64Value() {
 }
 
 void UInt64Value::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void UInt64Value::ArenaDtor(void* object) {
@@ -1047,27 +1149,27 @@ void UInt64Value::ArenaDtor(void* object) {
 void UInt64Value::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void UInt64Value::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* UInt64Value::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[3].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const UInt64Value& UInt64Value::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt64Value.base);
   return *internal_default_instance();
 }
 
-UInt64Value* UInt64Value::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<UInt64Value>(arena);
-}
 
 void UInt64Value::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.UInt64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = GOOGLE_ULONGLONG(0);
+  _internal_metadata_.Clear();
 }
 
 bool UInt64Value::MergePartialFromCodedStream(
@@ -1076,14 +1178,14 @@ bool UInt64Value::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.UInt64Value)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // uint64 value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::uint64, ::google::protobuf::internal::WireFormatLite::TYPE_UINT64>(
@@ -1096,12 +1198,11 @@ bool UInt64Value::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1118,23 +1219,37 @@ failure:
 void UInt64Value::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.UInt64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // uint64 value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteUInt64(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.UInt64Value)
 }
 
 ::google::protobuf::uint8* UInt64Value::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.UInt64Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // uint64 value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteUInt64ToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.UInt64Value)
   return target;
 }
@@ -1143,6 +1258,11 @@ size_t UInt64Value::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.UInt64Value)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // uint64 value = 1;
   if (this->value() != 0) {
     total_size += 1 +
@@ -1151,9 +1271,7 @@ size_t UInt64Value::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1176,6 +1294,9 @@ void UInt64Value::MergeFrom(const UInt64Value& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.UInt64Value)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -1219,62 +1340,43 @@ void UInt64Value::UnsafeArenaSwap(UInt64Value* other) {
   InternalSwap(other);
 }
 void UInt64Value::InternalSwap(UInt64Value* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata UInt64Value::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[3];
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// UInt64Value
-
-// uint64 value = 1;
-void UInt64Value::clear_value() {
-  value_ = GOOGLE_ULONGLONG(0);
-}
-::google::protobuf::uint64 UInt64Value::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UInt64Value.value)
-  return value_;
-}
-void UInt64Value::set_value(::google::protobuf::uint64 value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UInt64Value.value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void Int32Value::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int Int32Value::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 Int32Value::Int32Value()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int32Value.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.Int32Value)
 }
 Int32Value::Int32Value(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int32Value.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.Int32Value)
 }
 Int32Value::Int32Value(const Int32Value& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.Int32Value)
@@ -1282,7 +1384,6 @@ Int32Value::Int32Value(const Int32Value& from)
 
 void Int32Value::SharedCtor() {
   value_ = 0;
-  _cached_size_ = 0;
 }
 
 Int32Value::~Int32Value() {
@@ -1291,11 +1392,7 @@ Int32Value::~Int32Value() {
 }
 
 void Int32Value::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void Int32Value::ArenaDtor(void* object) {
@@ -1305,27 +1402,27 @@ void Int32Value::ArenaDtor(void* object) {
 void Int32Value::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void Int32Value::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* Int32Value::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[4].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const Int32Value& Int32Value::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_Int32Value.base);
   return *internal_default_instance();
 }
 
-Int32Value* Int32Value::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<Int32Value>(arena);
-}
 
 void Int32Value::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.Int32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = 0;
+  _internal_metadata_.Clear();
 }
 
 bool Int32Value::MergePartialFromCodedStream(
@@ -1334,14 +1431,14 @@ bool Int32Value::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.Int32Value)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // int32 value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::int32, ::google::protobuf::internal::WireFormatLite::TYPE_INT32>(
@@ -1354,12 +1451,11 @@ bool Int32Value::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1376,23 +1472,37 @@ failure:
 void Int32Value::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.Int32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int32 value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteInt32(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.Int32Value)
 }
 
 ::google::protobuf::uint8* Int32Value::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.Int32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // int32 value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteInt32ToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.Int32Value)
   return target;
 }
@@ -1401,6 +1511,11 @@ size_t Int32Value::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.Int32Value)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // int32 value = 1;
   if (this->value() != 0) {
     total_size += 1 +
@@ -1409,9 +1524,7 @@ size_t Int32Value::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1434,6 +1547,9 @@ void Int32Value::MergeFrom(const Int32Value& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.Int32Value)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -1477,62 +1593,43 @@ void Int32Value::UnsafeArenaSwap(Int32Value* other) {
   InternalSwap(other);
 }
 void Int32Value::InternalSwap(Int32Value* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata Int32Value::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[4];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// Int32Value
-
-// int32 value = 1;
-void Int32Value::clear_value() {
-  value_ = 0;
-}
-::google::protobuf::int32 Int32Value::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.Int32Value.value)
-  return value_;
-}
-void Int32Value::set_value(::google::protobuf::int32 value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.Int32Value.value)
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void UInt32Value::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int UInt32Value::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 UInt32Value::UInt32Value()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt32Value.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.UInt32Value)
 }
 UInt32Value::UInt32Value(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt32Value.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.UInt32Value)
 }
 UInt32Value::UInt32Value(const UInt32Value& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.UInt32Value)
@@ -1540,7 +1637,6 @@ UInt32Value::UInt32Value(const UInt32Value& from)
 
 void UInt32Value::SharedCtor() {
   value_ = 0u;
-  _cached_size_ = 0;
 }
 
 UInt32Value::~UInt32Value() {
@@ -1549,11 +1645,7 @@ UInt32Value::~UInt32Value() {
 }
 
 void UInt32Value::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void UInt32Value::ArenaDtor(void* object) {
@@ -1563,27 +1655,27 @@ void UInt32Value::ArenaDtor(void* object) {
 void UInt32Value::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void UInt32Value::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* UInt32Value::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[5].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const UInt32Value& UInt32Value::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_UInt32Value.base);
   return *internal_default_instance();
 }
 
-UInt32Value* UInt32Value::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<UInt32Value>(arena);
-}
 
 void UInt32Value::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.UInt32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = 0u;
+  _internal_metadata_.Clear();
 }
 
 bool UInt32Value::MergePartialFromCodedStream(
@@ -1592,14 +1684,14 @@ bool UInt32Value::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.UInt32Value)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // uint32 value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    ::google::protobuf::uint32, ::google::protobuf::internal::WireFormatLite::TYPE_UINT32>(
@@ -1612,12 +1704,11 @@ bool UInt32Value::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1634,23 +1725,37 @@ failure:
 void UInt32Value::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.UInt32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // uint32 value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteUInt32(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.UInt32Value)
 }
 
 ::google::protobuf::uint8* UInt32Value::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.UInt32Value)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // uint32 value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteUInt32ToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.UInt32Value)
   return target;
 }
@@ -1659,6 +1764,11 @@ size_t UInt32Value::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.UInt32Value)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // uint32 value = 1;
   if (this->value() != 0) {
     total_size += 1 +
@@ -1667,9 +1777,7 @@ size_t UInt32Value::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1692,6 +1800,9 @@ void UInt32Value::MergeFrom(const UInt32Value& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.UInt32Value)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -1735,62 +1846,43 @@ void UInt32Value::UnsafeArenaSwap(UInt32Value* other) {
   InternalSwap(other);
 }
 void UInt32Value::InternalSwap(UInt32Value* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata UInt32Value::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[5];
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// UInt32Value
-
-// uint32 value = 1;
-void UInt32Value::clear_value() {
-  value_ = 0u;
-}
-::google::protobuf::uint32 UInt32Value::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.UInt32Value.value)
-  return value_;
-}
-void UInt32Value::set_value(::google::protobuf::uint32 value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.UInt32Value.value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void BoolValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int BoolValue::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 BoolValue::BoolValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BoolValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.BoolValue)
 }
 BoolValue::BoolValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BoolValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.BoolValue)
 }
 BoolValue::BoolValue(const BoolValue& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_ = from.value_;
   // @@protoc_insertion_point(copy_constructor:google.protobuf.BoolValue)
@@ -1798,7 +1890,6 @@ BoolValue::BoolValue(const BoolValue& from)
 
 void BoolValue::SharedCtor() {
   value_ = false;
-  _cached_size_ = 0;
 }
 
 BoolValue::~BoolValue() {
@@ -1807,11 +1898,7 @@ BoolValue::~BoolValue() {
 }
 
 void BoolValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
 }
 
 void BoolValue::ArenaDtor(void* object) {
@@ -1821,27 +1908,27 @@ void BoolValue::ArenaDtor(void* object) {
 void BoolValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void BoolValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* BoolValue::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[6].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const BoolValue& BoolValue::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BoolValue.base);
   return *internal_default_instance();
 }
 
-BoolValue* BoolValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<BoolValue>(arena);
-}
 
 void BoolValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.BoolValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_ = false;
+  _internal_metadata_.Clear();
 }
 
 bool BoolValue::MergePartialFromCodedStream(
@@ -1850,14 +1937,14 @@ bool BoolValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.BoolValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // bool value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(8u)) {
+            static_cast< ::google::protobuf::uint8>(8u /* 8 & 0xFF */)) {
 
           DO_((::google::protobuf::internal::WireFormatLite::ReadPrimitive<
                    bool, ::google::protobuf::internal::WireFormatLite::TYPE_BOOL>(
@@ -1870,12 +1957,11 @@ bool BoolValue::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -1892,23 +1978,37 @@ failure:
 void BoolValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.BoolValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // bool value = 1;
   if (this->value() != 0) {
     ::google::protobuf::internal::WireFormatLite::WriteBool(1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.BoolValue)
 }
 
 ::google::protobuf::uint8* BoolValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.BoolValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // bool value = 1;
   if (this->value() != 0) {
     target = ::google::protobuf::internal::WireFormatLite::WriteBoolToArray(1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.BoolValue)
   return target;
 }
@@ -1917,15 +2017,18 @@ size_t BoolValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.BoolValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // bool value = 1;
   if (this->value() != 0) {
     total_size += 1 + 1;
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -1948,6 +2051,9 @@ void BoolValue::MergeFrom(const BoolValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.BoolValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value() != 0) {
     set_value(from.value());
   }
@@ -1991,62 +2097,43 @@ void BoolValue::UnsafeArenaSwap(BoolValue* other) {
   InternalSwap(other);
 }
 void BoolValue::InternalSwap(BoolValue* other) {
-  std::swap(value_, other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  swap(value_, other->value_);
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata BoolValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[6];
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// BoolValue
-
-// bool value = 1;
-void BoolValue::clear_value() {
-  value_ = false;
-}
-bool BoolValue::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.BoolValue.value)
-  return value_;
-}
-void BoolValue::set_value(bool value) {
-  
-  value_ = value;
-  // @@protoc_insertion_point(field_set:google.protobuf.BoolValue.value)
-}
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void StringValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int StringValue::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 StringValue::StringValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_StringValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.StringValue)
 }
 StringValue::StringValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_StringValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.StringValue)
 }
 StringValue::StringValue(const StringValue& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.value().size() > 0) {
@@ -2058,7 +2145,6 @@ StringValue::StringValue(const StringValue& from)
 
 void StringValue::SharedCtor() {
   value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _cached_size_ = 0;
 }
 
 StringValue::~StringValue() {
@@ -2067,12 +2153,8 @@ StringValue::~StringValue() {
 }
 
 void StringValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  value_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
 void StringValue::ArenaDtor(void* object) {
@@ -2082,27 +2164,27 @@ void StringValue::ArenaDtor(void* object) {
 void StringValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void StringValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* StringValue::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[7].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const StringValue& StringValue::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_StringValue.base);
   return *internal_default_instance();
 }
 
-StringValue* StringValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<StringValue>(arena);
-}
 
 void StringValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.StringValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  _internal_metadata_.Clear();
 }
 
 bool StringValue::MergePartialFromCodedStream(
@@ -2111,18 +2193,18 @@ bool StringValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.StringValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // string value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadString(
                 input, this->mutable_value()));
           DO_(::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-            this->value().data(), this->value().length(),
+            this->value().data(), static_cast<int>(this->value().length()),
             ::google::protobuf::internal::WireFormatLite::PARSE,
             "google.protobuf.StringValue.value"));
         } else {
@@ -2133,12 +2215,11 @@ bool StringValue::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2155,27 +2236,37 @@ failure:
 void StringValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.StringValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string value = 1;
   if (this->value().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->value().data(), this->value().length(),
+      this->value().data(), static_cast<int>(this->value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.StringValue.value");
     ::google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(
       1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.StringValue)
 }
 
 ::google::protobuf::uint8* StringValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.StringValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // string value = 1;
   if (this->value().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::VerifyUtf8String(
-      this->value().data(), this->value().length(),
+      this->value().data(), static_cast<int>(this->value().length()),
       ::google::protobuf::internal::WireFormatLite::SERIALIZE,
       "google.protobuf.StringValue.value");
     target =
@@ -2183,6 +2274,10 @@ void StringValue::SerializeWithCachedSizes(
         1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.StringValue)
   return target;
 }
@@ -2191,6 +2286,11 @@ size_t StringValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.StringValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // string value = 1;
   if (this->value().size() > 0) {
     total_size += 1 +
@@ -2199,9 +2299,7 @@ size_t StringValue::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -2224,6 +2322,9 @@ void StringValue::MergeFrom(const StringValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.StringValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value().size() > 0) {
     set_value(from.value());
   }
@@ -2267,114 +2368,44 @@ void StringValue::UnsafeArenaSwap(StringValue* other) {
   InternalSwap(other);
 }
 void StringValue::InternalSwap(StringValue* other) {
-  value_.Swap(&other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  value_.Swap(&other->value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata StringValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[7];
-}
-
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// StringValue
-
-// string value = 1;
-void StringValue::clear_value() {
-  value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-const ::std::string& StringValue::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.StringValue.value)
-  return value_.Get();
-}
-void StringValue::set_value(const ::std::string& value) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.StringValue.value)
-}
-void StringValue::set_value(const char* value) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.StringValue.value)
-}
-void StringValue::set_value(const char* value,
-    size_t size) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.StringValue.value)
-}
-::std::string* StringValue::mutable_value() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.StringValue.value)
-  return value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* StringValue::release_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.StringValue.value)
-  
-  return value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* StringValue::unsafe_arena_release_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.StringValue.value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
-void StringValue::set_allocated_value(::std::string* value) {
-  if (value != NULL) {
-    
-  } else {
-    
-  }
-  value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.StringValue.value)
-}
-void StringValue::unsafe_arena_set_allocated_value(
-    ::std::string* value) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (value != NULL) {
-    
-  } else {
-    
-  }
-  value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.StringValue.value)
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
 
 // ===================================================================
 
+void BytesValue::InitAsDefaultInstance() {
+}
 #if !defined(_MSC_VER) || _MSC_VER >= 1900
 const int BytesValue::kValueFieldNumber;
 #endif  // !defined(_MSC_VER) || _MSC_VER >= 1900
 
 BytesValue::BytesValue()
   : ::google::protobuf::Message(), _internal_metadata_(NULL) {
-  if (GOOGLE_PREDICT_TRUE(this != internal_default_instance())) {
-    protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-  }
+  ::google::protobuf::internal::InitSCC(
+      &protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BytesValue.base);
   SharedCtor();
   // @@protoc_insertion_point(constructor:google.protobuf.BytesValue)
 }
 BytesValue::BytesValue(::google::protobuf::Arena* arena)
   : ::google::protobuf::Message(),
   _internal_metadata_(arena) {
-#ifdef GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
-#endif  // GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BytesValue.base);
   SharedCtor();
   RegisterArenaDtor(arena);
   // @@protoc_insertion_point(arena_constructor:google.protobuf.BytesValue)
 }
 BytesValue::BytesValue(const BytesValue& from)
   : ::google::protobuf::Message(),
-      _internal_metadata_(NULL),
-      _cached_size_(0) {
+      _internal_metadata_(NULL) {
   _internal_metadata_.MergeFrom(from._internal_metadata_);
   value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
   if (from.value().size() > 0) {
@@ -2386,7 +2417,6 @@ BytesValue::BytesValue(const BytesValue& from)
 
 void BytesValue::SharedCtor() {
   value_.UnsafeSetDefault(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
-  _cached_size_ = 0;
 }
 
 BytesValue::~BytesValue() {
@@ -2395,12 +2425,8 @@ BytesValue::~BytesValue() {
 }
 
 void BytesValue::SharedDtor() {
-  ::google::protobuf::Arena* arena = GetArenaNoVirtual();
-  if (arena != NULL) {
-    return;
-  }
-
-  value_.Destroy(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), arena);
+  GOOGLE_DCHECK(GetArenaNoVirtual() == NULL);
+  value_.DestroyNoArena(&::google::protobuf::internal::GetEmptyStringAlreadyInited());
 }
 
 void BytesValue::ArenaDtor(void* object) {
@@ -2410,27 +2436,27 @@ void BytesValue::ArenaDtor(void* object) {
 void BytesValue::RegisterArenaDtor(::google::protobuf::Arena* arena) {
 }
 void BytesValue::SetCachedSize(int size) const {
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  _cached_size_.Set(size);
 }
 const ::google::protobuf::Descriptor* BytesValue::descriptor() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[8].descriptor;
+  ::protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages].descriptor;
 }
 
 const BytesValue& BytesValue::default_instance() {
-  protobuf_google_2fprotobuf_2fwrappers_2eproto::InitDefaults();
+  ::google::protobuf::internal::InitSCC(&protobuf_google_2fprotobuf_2fwrappers_2eproto::scc_info_BytesValue.base);
   return *internal_default_instance();
 }
 
-BytesValue* BytesValue::New(::google::protobuf::Arena* arena) const {
-  return ::google::protobuf::Arena::CreateMessage<BytesValue>(arena);
-}
 
 void BytesValue::Clear() {
 // @@protoc_insertion_point(message_clear_start:google.protobuf.BytesValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
   value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+  _internal_metadata_.Clear();
 }
 
 bool BytesValue::MergePartialFromCodedStream(
@@ -2439,14 +2465,14 @@ bool BytesValue::MergePartialFromCodedStream(
   ::google::protobuf::uint32 tag;
   // @@protoc_insertion_point(parse_start:google.protobuf.BytesValue)
   for (;;) {
-    ::std::pair< ::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
+    ::std::pair<::google::protobuf::uint32, bool> p = input->ReadTagWithCutoffNoLastTag(127u);
     tag = p.first;
     if (!p.second) goto handle_unusual;
     switch (::google::protobuf::internal::WireFormatLite::GetTagFieldNumber(tag)) {
       // bytes value = 1;
       case 1: {
         if (static_cast< ::google::protobuf::uint8>(tag) ==
-            static_cast< ::google::protobuf::uint8>(10u)) {
+            static_cast< ::google::protobuf::uint8>(10u /* 10 & 0xFF */)) {
           DO_(::google::protobuf::internal::WireFormatLite::ReadBytes(
                 input, this->mutable_value()));
         } else {
@@ -2457,12 +2483,11 @@ bool BytesValue::MergePartialFromCodedStream(
 
       default: {
       handle_unusual:
-        if (tag == 0 ||
-            ::google::protobuf::internal::WireFormatLite::GetTagWireType(tag) ==
-            ::google::protobuf::internal::WireFormatLite::WIRETYPE_END_GROUP) {
+        if (tag == 0) {
           goto success;
         }
-        DO_(::google::protobuf::internal::WireFormatLite::SkipField(input, tag));
+        DO_(::google::protobuf::internal::WireFormat::SkipField(
+              input, tag, _internal_metadata_.mutable_unknown_fields()));
         break;
       }
     }
@@ -2479,19 +2504,29 @@ failure:
 void BytesValue::SerializeWithCachedSizes(
     ::google::protobuf::io::CodedOutputStream* output) const {
   // @@protoc_insertion_point(serialize_start:google.protobuf.BytesValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // bytes value = 1;
   if (this->value().size() > 0) {
     ::google::protobuf::internal::WireFormatLite::WriteBytesMaybeAliased(
       1, this->value(), output);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    ::google::protobuf::internal::WireFormat::SerializeUnknownFields(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), output);
+  }
   // @@protoc_insertion_point(serialize_end:google.protobuf.BytesValue)
 }
 
 ::google::protobuf::uint8* BytesValue::InternalSerializeWithCachedSizesToArray(
     bool deterministic, ::google::protobuf::uint8* target) const {
-  (void)deterministic;  // Unused
+  (void)deterministic; // Unused
   // @@protoc_insertion_point(serialize_to_array_start:google.protobuf.BytesValue)
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   // bytes value = 1;
   if (this->value().size() > 0) {
     target =
@@ -2499,6 +2534,10 @@ void BytesValue::SerializeWithCachedSizes(
         1, this->value(), target);
   }
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    target = ::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()), target);
+  }
   // @@protoc_insertion_point(serialize_to_array_end:google.protobuf.BytesValue)
   return target;
 }
@@ -2507,6 +2546,11 @@ size_t BytesValue::ByteSizeLong() const {
 // @@protoc_insertion_point(message_byte_size_start:google.protobuf.BytesValue)
   size_t total_size = 0;
 
+  if ((_internal_metadata_.have_unknown_fields() &&  ::google::protobuf::internal::GetProto3PreserveUnknownsDefault())) {
+    total_size +=
+      ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(
+        (::google::protobuf::internal::GetProto3PreserveUnknownsDefault()   ? _internal_metadata_.unknown_fields()   : _internal_metadata_.default_instance()));
+  }
   // bytes value = 1;
   if (this->value().size() > 0) {
     total_size += 1 +
@@ -2515,9 +2559,7 @@ size_t BytesValue::ByteSizeLong() const {
   }
 
   int cached_size = ::google::protobuf::internal::ToCachedSize(total_size);
-  GOOGLE_SAFE_CONCURRENT_WRITES_BEGIN();
-  _cached_size_ = cached_size;
-  GOOGLE_SAFE_CONCURRENT_WRITES_END();
+  SetCachedSize(cached_size);
   return total_size;
 }
 
@@ -2540,6 +2582,9 @@ void BytesValue::MergeFrom(const BytesValue& from) {
 // @@protoc_insertion_point(class_specific_merge_from_start:google.protobuf.BytesValue)
   GOOGLE_DCHECK_NE(&from, this);
   _internal_metadata_.MergeFrom(from._internal_metadata_);
+  ::google::protobuf::uint32 cached_has_bits = 0;
+  (void) cached_has_bits;
+
   if (from.value().size() > 0) {
     set_value(from.value());
   }
@@ -2583,88 +2628,50 @@ void BytesValue::UnsafeArenaSwap(BytesValue* other) {
   InternalSwap(other);
 }
 void BytesValue::InternalSwap(BytesValue* other) {
-  value_.Swap(&other->value_);
-  std::swap(_cached_size_, other->_cached_size_);
+  using std::swap;
+  value_.Swap(&other->value_, &::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+    GetArenaNoVirtual());
+  _internal_metadata_.Swap(&other->_internal_metadata_);
 }
 
 ::google::protobuf::Metadata BytesValue::GetMetadata() const {
   protobuf_google_2fprotobuf_2fwrappers_2eproto::protobuf_AssignDescriptorsOnce();
-  return protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[8];
+  return ::protobuf_google_2fprotobuf_2fwrappers_2eproto::file_level_metadata[kIndexInFileMessages];
 }
 
-#if PROTOBUF_INLINE_NOT_IN_HEADERS
-// BytesValue
 
-// bytes value = 1;
-void BytesValue::clear_value() {
-  value_.ClearToEmpty(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
+// @@protoc_insertion_point(namespace_scope)
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::DoubleValue* Arena::CreateMaybeMessage< ::google::protobuf::DoubleValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::DoubleValue >(arena);
 }
-const ::std::string& BytesValue::value() const {
-  // @@protoc_insertion_point(field_get:google.protobuf.BytesValue.value)
-  return value_.Get();
-}
-void BytesValue::set_value(const ::std::string& value) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set:google.protobuf.BytesValue.value)
-}
-void BytesValue::set_value(const char* value) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
-              GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_char:google.protobuf.BytesValue.value)
-}
-void BytesValue::set_value(const void* value,
-    size_t size) {
-  
-  value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(
-      reinterpret_cast<const char*>(value), size), GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_pointer:google.protobuf.BytesValue.value)
-}
-::std::string* BytesValue::mutable_value() {
-  
-  // @@protoc_insertion_point(field_mutable:google.protobuf.BytesValue.value)
-  return value_.Mutable(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* BytesValue::release_value() {
-  // @@protoc_insertion_point(field_release:google.protobuf.BytesValue.value)
-  
-  return value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
-}
-::std::string* BytesValue::unsafe_arena_release_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.BytesValue.value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::FloatValue* Arena::CreateMaybeMessage< ::google::protobuf::FloatValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::FloatValue >(arena);
 }
-void BytesValue::set_allocated_value(::std::string* value) {
-  if (value != NULL) {
-    
-  } else {
-    
-  }
-  value_.SetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value,
-      GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_set_allocated:google.protobuf.BytesValue.value)
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Int64Value* Arena::CreateMaybeMessage< ::google::protobuf::Int64Value >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Int64Value >(arena);
 }
-void BytesValue::unsafe_arena_set_allocated_value(
-    ::std::string* value) {
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  if (value != NULL) {
-    
-  } else {
-    
-  }
-  value_.UnsafeArenaSetAllocated(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      value, GetArenaNoVirtual());
-  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.BytesValue.value)
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::UInt64Value* Arena::CreateMaybeMessage< ::google::protobuf::UInt64Value >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::UInt64Value >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::Int32Value* Arena::CreateMaybeMessage< ::google::protobuf::Int32Value >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::Int32Value >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::UInt32Value* Arena::CreateMaybeMessage< ::google::protobuf::UInt32Value >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::UInt32Value >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::BoolValue* Arena::CreateMaybeMessage< ::google::protobuf::BoolValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::BoolValue >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::StringValue* Arena::CreateMaybeMessage< ::google::protobuf::StringValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::StringValue >(arena);
+}
+template<> GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE ::google::protobuf::BytesValue* Arena::CreateMaybeMessage< ::google::protobuf::BytesValue >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::google::protobuf::BytesValue >(arena);
 }
-
-#endif  // PROTOBUF_INLINE_NOT_IN_HEADERS
-
-// @@protoc_insertion_point(namespace_scope)
-
 }  // namespace protobuf
 }  // namespace google
 
diff --git a/src/google/protobuf/wrappers.pb.h b/src/google/protobuf/wrappers.pb.h
index 61b0510d..9f51a062 100644
--- a/src/google/protobuf/wrappers.pb.h
+++ b/src/google/protobuf/wrappers.pb.h
@@ -1,19 +1,19 @@
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
 // source: google/protobuf/wrappers.proto
 
-#ifndef PROTOBUF_google_2fprotobuf_2fwrappers_2eproto__INCLUDED
-#define PROTOBUF_google_2fprotobuf_2fwrappers_2eproto__INCLUDED
+#ifndef PROTOBUF_INCLUDED_google_2fprotobuf_2fwrappers_2eproto
+#define PROTOBUF_INCLUDED_google_2fprotobuf_2fwrappers_2eproto
 
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
 
-#if GOOGLE_PROTOBUF_VERSION < 3002000
+#if GOOGLE_PROTOBUF_VERSION < 3005000
 #error This file was generated by a newer version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please update
 #error your headers.
 #endif
-#if 3002000 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
+#if 3005001 < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION
 #error This file was generated by an older version of protoc which is
 #error incompatible with your Protocol Buffer headers.  Please
 #error regenerate this file with a newer version of protoc.
@@ -22,13 +22,29 @@
 #include <google/protobuf/io/coded_stream.h>
 #include <google/protobuf/arena.h>
 #include <google/protobuf/arenastring.h>
+#include <google/protobuf/generated_message_table_driven.h>
 #include <google/protobuf/generated_message_util.h>
+#include <google/protobuf/inlined_string_field.h>
 #include <google/protobuf/metadata.h>
 #include <google/protobuf/message.h>
 #include <google/protobuf/repeated_field.h>  // IWYU pragma: export
 #include <google/protobuf/extension_set.h>  // IWYU pragma: export
 #include <google/protobuf/unknown_field_set.h>
 // @@protoc_insertion_point(includes)
+#define PROTOBUF_INTERNAL_EXPORT_protobuf_google_2fprotobuf_2fwrappers_2eproto LIBPROTOBUF_EXPORT
+
+namespace protobuf_google_2fprotobuf_2fwrappers_2eproto {
+// Internal implementation detail -- do not use these members.
+struct LIBPROTOBUF_EXPORT TableStruct {
+  static const ::google::protobuf::internal::ParseTableField entries[];
+  static const ::google::protobuf::internal::AuxillaryParseTableField aux[];
+  static const ::google::protobuf::internal::ParseTable schema[9];
+  static const ::google::protobuf::internal::FieldMetadata field_metadata[];
+  static const ::google::protobuf::internal::SerializationTable serialization_table[];
+  static const ::google::protobuf::uint32 offsets[];
+};
+void LIBPROTOBUF_EXPORT AddDescriptors();
+}  // namespace protobuf_google_2fprotobuf_2fwrappers_2eproto
 namespace google {
 namespace protobuf {
 class BoolValue;
@@ -60,20 +76,21 @@ class UInt64ValueDefaultTypeInternal;
 LIBPROTOBUF_EXPORT extern UInt64ValueDefaultTypeInternal _UInt64Value_default_instance_;
 }  // namespace protobuf
 }  // namespace google
-
 namespace google {
 namespace protobuf {
-
-namespace protobuf_google_2fprotobuf_2fwrappers_2eproto {
-// Internal implementation detail -- do not call these.
-struct LIBPROTOBUF_EXPORT TableStruct {
-  static const ::google::protobuf::uint32 offsets[];
-  static void InitDefaultsImpl();
-  static void Shutdown();
-};
-void LIBPROTOBUF_EXPORT AddDescriptors();
-void LIBPROTOBUF_EXPORT InitDefaults();
-}  // namespace protobuf_google_2fprotobuf_2fwrappers_2eproto
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::BoolValue* Arena::CreateMaybeMessage<::google::protobuf::BoolValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::BytesValue* Arena::CreateMaybeMessage<::google::protobuf::BytesValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::DoubleValue* Arena::CreateMaybeMessage<::google::protobuf::DoubleValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::FloatValue* Arena::CreateMaybeMessage<::google::protobuf::FloatValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Int32Value* Arena::CreateMaybeMessage<::google::protobuf::Int32Value>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::Int64Value* Arena::CreateMaybeMessage<::google::protobuf::Int64Value>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::StringValue* Arena::CreateMaybeMessage<::google::protobuf::StringValue>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::UInt32Value* Arena::CreateMaybeMessage<::google::protobuf::UInt32Value>(Arena*);
+template<> LIBPROTOBUF_EXPORT ::google::protobuf::UInt64Value* Arena::CreateMaybeMessage<::google::protobuf::UInt64Value>(Arena*);
+}  // namespace protobuf
+}  // namespace google
+namespace google {
+namespace protobuf {
 
 // ===================================================================
 
@@ -88,53 +105,73 @@ class LIBPROTOBUF_EXPORT DoubleValue : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  DoubleValue(DoubleValue&& from) noexcept
+    : DoubleValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline DoubleValue& operator=(DoubleValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const DoubleValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const DoubleValue* internal_default_instance() {
     return reinterpret_cast<const DoubleValue*>(
                &_DoubleValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    0;
 
   void UnsafeArenaSwap(DoubleValue* other);
   void Swap(DoubleValue* other);
+  friend void swap(DoubleValue& a, DoubleValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline DoubleValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline DoubleValue* New() const final {
+    return CreateMaybeMessage<DoubleValue>(NULL);
+  }
 
-  DoubleValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  DoubleValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<DoubleValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const DoubleValue& from);
   void MergeFrom(const DoubleValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(DoubleValue* other);
   protected:
   explicit DoubleValue(::google::protobuf::Arena* arena);
@@ -150,7 +187,7 @@ class LIBPROTOBUF_EXPORT DoubleValue : public ::google::protobuf::Message /* @@p
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -166,12 +203,12 @@ class LIBPROTOBUF_EXPORT DoubleValue : public ::google::protobuf::Message /* @@p
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   double value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -186,53 +223,73 @@ class LIBPROTOBUF_EXPORT FloatValue : public ::google::protobuf::Message /* @@pr
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  FloatValue(FloatValue&& from) noexcept
+    : FloatValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline FloatValue& operator=(FloatValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const FloatValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const FloatValue* internal_default_instance() {
     return reinterpret_cast<const FloatValue*>(
                &_FloatValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    1;
 
   void UnsafeArenaSwap(FloatValue* other);
   void Swap(FloatValue* other);
+  friend void swap(FloatValue& a, FloatValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline FloatValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline FloatValue* New() const final {
+    return CreateMaybeMessage<FloatValue>(NULL);
+  }
 
-  FloatValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  FloatValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<FloatValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const FloatValue& from);
   void MergeFrom(const FloatValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(FloatValue* other);
   protected:
   explicit FloatValue(::google::protobuf::Arena* arena);
@@ -248,7 +305,7 @@ class LIBPROTOBUF_EXPORT FloatValue : public ::google::protobuf::Message /* @@pr
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -264,12 +321,12 @@ class LIBPROTOBUF_EXPORT FloatValue : public ::google::protobuf::Message /* @@pr
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   float value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -284,53 +341,73 @@ class LIBPROTOBUF_EXPORT Int64Value : public ::google::protobuf::Message /* @@pr
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Int64Value(Int64Value&& from) noexcept
+    : Int64Value() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Int64Value& operator=(Int64Value&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Int64Value& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Int64Value* internal_default_instance() {
     return reinterpret_cast<const Int64Value*>(
                &_Int64Value_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    2;
 
   void UnsafeArenaSwap(Int64Value* other);
   void Swap(Int64Value* other);
+  friend void swap(Int64Value& a, Int64Value& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Int64Value* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Int64Value* New() const final {
+    return CreateMaybeMessage<Int64Value>(NULL);
+  }
 
-  Int64Value* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Int64Value* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Int64Value>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Int64Value& from);
   void MergeFrom(const Int64Value& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Int64Value* other);
   protected:
   explicit Int64Value(::google::protobuf::Arena* arena);
@@ -346,7 +423,7 @@ class LIBPROTOBUF_EXPORT Int64Value : public ::google::protobuf::Message /* @@pr
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -362,12 +439,12 @@ class LIBPROTOBUF_EXPORT Int64Value : public ::google::protobuf::Message /* @@pr
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::int64 value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -382,53 +459,73 @@ class LIBPROTOBUF_EXPORT UInt64Value : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  UInt64Value(UInt64Value&& from) noexcept
+    : UInt64Value() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline UInt64Value& operator=(UInt64Value&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const UInt64Value& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const UInt64Value* internal_default_instance() {
     return reinterpret_cast<const UInt64Value*>(
                &_UInt64Value_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    3;
 
   void UnsafeArenaSwap(UInt64Value* other);
   void Swap(UInt64Value* other);
+  friend void swap(UInt64Value& a, UInt64Value& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline UInt64Value* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline UInt64Value* New() const final {
+    return CreateMaybeMessage<UInt64Value>(NULL);
+  }
 
-  UInt64Value* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  UInt64Value* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<UInt64Value>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const UInt64Value& from);
   void MergeFrom(const UInt64Value& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(UInt64Value* other);
   protected:
   explicit UInt64Value(::google::protobuf::Arena* arena);
@@ -444,7 +541,7 @@ class LIBPROTOBUF_EXPORT UInt64Value : public ::google::protobuf::Message /* @@p
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -460,12 +557,12 @@ class LIBPROTOBUF_EXPORT UInt64Value : public ::google::protobuf::Message /* @@p
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::uint64 value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -480,53 +577,73 @@ class LIBPROTOBUF_EXPORT Int32Value : public ::google::protobuf::Message /* @@pr
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  Int32Value(Int32Value&& from) noexcept
+    : Int32Value() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline Int32Value& operator=(Int32Value&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const Int32Value& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const Int32Value* internal_default_instance() {
     return reinterpret_cast<const Int32Value*>(
                &_Int32Value_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    4;
 
   void UnsafeArenaSwap(Int32Value* other);
   void Swap(Int32Value* other);
+  friend void swap(Int32Value& a, Int32Value& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline Int32Value* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline Int32Value* New() const final {
+    return CreateMaybeMessage<Int32Value>(NULL);
+  }
 
-  Int32Value* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  Int32Value* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<Int32Value>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const Int32Value& from);
   void MergeFrom(const Int32Value& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(Int32Value* other);
   protected:
   explicit Int32Value(::google::protobuf::Arena* arena);
@@ -542,7 +659,7 @@ class LIBPROTOBUF_EXPORT Int32Value : public ::google::protobuf::Message /* @@pr
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -558,12 +675,12 @@ class LIBPROTOBUF_EXPORT Int32Value : public ::google::protobuf::Message /* @@pr
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::int32 value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -578,53 +695,73 @@ class LIBPROTOBUF_EXPORT UInt32Value : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  UInt32Value(UInt32Value&& from) noexcept
+    : UInt32Value() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline UInt32Value& operator=(UInt32Value&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const UInt32Value& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const UInt32Value* internal_default_instance() {
     return reinterpret_cast<const UInt32Value*>(
                &_UInt32Value_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    5;
 
   void UnsafeArenaSwap(UInt32Value* other);
   void Swap(UInt32Value* other);
+  friend void swap(UInt32Value& a, UInt32Value& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline UInt32Value* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline UInt32Value* New() const final {
+    return CreateMaybeMessage<UInt32Value>(NULL);
+  }
 
-  UInt32Value* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  UInt32Value* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<UInt32Value>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const UInt32Value& from);
   void MergeFrom(const UInt32Value& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(UInt32Value* other);
   protected:
   explicit UInt32Value(::google::protobuf::Arena* arena);
@@ -640,7 +777,7 @@ class LIBPROTOBUF_EXPORT UInt32Value : public ::google::protobuf::Message /* @@p
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -656,12 +793,12 @@ class LIBPROTOBUF_EXPORT UInt32Value : public ::google::protobuf::Message /* @@p
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::uint32 value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -676,53 +813,73 @@ class LIBPROTOBUF_EXPORT BoolValue : public ::google::protobuf::Message /* @@pro
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  BoolValue(BoolValue&& from) noexcept
+    : BoolValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline BoolValue& operator=(BoolValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const BoolValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const BoolValue* internal_default_instance() {
     return reinterpret_cast<const BoolValue*>(
                &_BoolValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    6;
 
   void UnsafeArenaSwap(BoolValue* other);
   void Swap(BoolValue* other);
+  friend void swap(BoolValue& a, BoolValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline BoolValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline BoolValue* New() const final {
+    return CreateMaybeMessage<BoolValue>(NULL);
+  }
 
-  BoolValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  BoolValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<BoolValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const BoolValue& from);
   void MergeFrom(const BoolValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(BoolValue* other);
   protected:
   explicit BoolValue(::google::protobuf::Arena* arena);
@@ -738,7 +895,7 @@ class LIBPROTOBUF_EXPORT BoolValue : public ::google::protobuf::Message /* @@pro
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -754,12 +911,12 @@ class LIBPROTOBUF_EXPORT BoolValue : public ::google::protobuf::Message /* @@pro
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   bool value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -774,53 +931,73 @@ class LIBPROTOBUF_EXPORT StringValue : public ::google::protobuf::Message /* @@p
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  StringValue(StringValue&& from) noexcept
+    : StringValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline StringValue& operator=(StringValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const StringValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const StringValue* internal_default_instance() {
     return reinterpret_cast<const StringValue*>(
                &_StringValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    7;
 
   void UnsafeArenaSwap(StringValue* other);
   void Swap(StringValue* other);
+  friend void swap(StringValue& a, StringValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline StringValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline StringValue* New() const final {
+    return CreateMaybeMessage<StringValue>(NULL);
+  }
 
-  StringValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  StringValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<StringValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const StringValue& from);
   void MergeFrom(const StringValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(StringValue* other);
   protected:
   explicit StringValue(::google::protobuf::Arena* arena);
@@ -836,7 +1013,7 @@ class LIBPROTOBUF_EXPORT StringValue : public ::google::protobuf::Message /* @@p
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -847,12 +1024,21 @@ class LIBPROTOBUF_EXPORT StringValue : public ::google::protobuf::Message /* @@p
   static const int kValueFieldNumber = 1;
   const ::std::string& value() const;
   void set_value(const ::std::string& value);
+  #if LANG_CXX11
+  void set_value(::std::string&& value);
+  #endif
   void set_value(const char* value);
   void set_value(const char* value, size_t size);
   ::std::string* mutable_value();
   ::std::string* release_value();
   void set_allocated_value(::std::string* value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_value(
       ::std::string* value);
 
@@ -860,12 +1046,12 @@ class LIBPROTOBUF_EXPORT StringValue : public ::google::protobuf::Message /* @@p
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::internal::ArenaStringPtr value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // -------------------------------------------------------------------
 
@@ -880,53 +1066,73 @@ class LIBPROTOBUF_EXPORT BytesValue : public ::google::protobuf::Message /* @@pr
     CopyFrom(from);
     return *this;
   }
+  #if LANG_CXX11
+  BytesValue(BytesValue&& from) noexcept
+    : BytesValue() {
+    *this = ::std::move(from);
+  }
 
-  inline ::google::protobuf::Arena* GetArena() const PROTOBUF_FINAL {
+  inline BytesValue& operator=(BytesValue&& from) noexcept {
+    if (GetArenaNoVirtual() == from.GetArenaNoVirtual()) {
+      if (this != &from) InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+  #endif
+  inline ::google::protobuf::Arena* GetArena() const final {
     return GetArenaNoVirtual();
   }
-  inline void* GetMaybeArenaPointer() const PROTOBUF_FINAL {
+  inline void* GetMaybeArenaPointer() const final {
     return MaybeArenaPtr();
   }
   static const ::google::protobuf::Descriptor* descriptor();
   static const BytesValue& default_instance();
 
+  static void InitAsDefaultInstance();  // FOR INTERNAL USE ONLY
   static inline const BytesValue* internal_default_instance() {
     return reinterpret_cast<const BytesValue*>(
                &_BytesValue_default_instance_);
   }
+  static constexpr int kIndexInFileMessages =
+    8;
 
   void UnsafeArenaSwap(BytesValue* other);
   void Swap(BytesValue* other);
+  friend void swap(BytesValue& a, BytesValue& b) {
+    a.Swap(&b);
+  }
 
   // implements Message ----------------------------------------------
 
-  inline BytesValue* New() const PROTOBUF_FINAL { return New(NULL); }
+  inline BytesValue* New() const final {
+    return CreateMaybeMessage<BytesValue>(NULL);
+  }
 
-  BytesValue* New(::google::protobuf::Arena* arena) const PROTOBUF_FINAL;
-  void CopyFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
-  void MergeFrom(const ::google::protobuf::Message& from) PROTOBUF_FINAL;
+  BytesValue* New(::google::protobuf::Arena* arena) const final {
+    return CreateMaybeMessage<BytesValue>(arena);
+  }
+  void CopyFrom(const ::google::protobuf::Message& from) final;
+  void MergeFrom(const ::google::protobuf::Message& from) final;
   void CopyFrom(const BytesValue& from);
   void MergeFrom(const BytesValue& from);
-  void Clear() PROTOBUF_FINAL;
-  bool IsInitialized() const PROTOBUF_FINAL;
+  void Clear() final;
+  bool IsInitialized() const final;
 
-  size_t ByteSizeLong() const PROTOBUF_FINAL;
+  size_t ByteSizeLong() const final;
   bool MergePartialFromCodedStream(
-      ::google::protobuf::io::CodedInputStream* input) PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedInputStream* input) final;
   void SerializeWithCachedSizes(
-      ::google::protobuf::io::CodedOutputStream* output) const PROTOBUF_FINAL;
+      ::google::protobuf::io::CodedOutputStream* output) const final;
   ::google::protobuf::uint8* InternalSerializeWithCachedSizesToArray(
-      bool deterministic, ::google::protobuf::uint8* target) const PROTOBUF_FINAL;
-  ::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output)
-      const PROTOBUF_FINAL {
-    return InternalSerializeWithCachedSizesToArray(
-        ::google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(), output);
-  }
-  int GetCachedSize() const PROTOBUF_FINAL { return _cached_size_; }
+      bool deterministic, ::google::protobuf::uint8* target) const final;
+  int GetCachedSize() const final { return _cached_size_.Get(); }
+
   private:
   void SharedCtor();
   void SharedDtor();
-  void SetCachedSize(int size) const PROTOBUF_FINAL;
+  void SetCachedSize(int size) const final;
   void InternalSwap(BytesValue* other);
   protected:
   explicit BytesValue(::google::protobuf::Arena* arena);
@@ -942,7 +1148,7 @@ class LIBPROTOBUF_EXPORT BytesValue : public ::google::protobuf::Message /* @@pr
   }
   public:
 
-  ::google::protobuf::Metadata GetMetadata() const PROTOBUF_FINAL;
+  ::google::protobuf::Metadata GetMetadata() const final;
 
   // nested types ----------------------------------------------------
 
@@ -953,12 +1159,21 @@ class LIBPROTOBUF_EXPORT BytesValue : public ::google::protobuf::Message /* @@pr
   static const int kValueFieldNumber = 1;
   const ::std::string& value() const;
   void set_value(const ::std::string& value);
+  #if LANG_CXX11
+  void set_value(::std::string&& value);
+  #endif
   void set_value(const char* value);
   void set_value(const void* value, size_t size);
   ::std::string* mutable_value();
   ::std::string* release_value();
   void set_allocated_value(::std::string* value);
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   ::std::string* unsafe_arena_release_value();
+  PROTOBUF_RUNTIME_DEPRECATED("The unsafe_arena_ accessors for"
+  "    string fields are deprecated and will be removed in a"
+  "    future release.")
   void unsafe_arena_set_allocated_value(
       ::std::string* value);
 
@@ -966,19 +1181,22 @@ class LIBPROTOBUF_EXPORT BytesValue : public ::google::protobuf::Message /* @@pr
  private:
 
   ::google::protobuf::internal::InternalMetadataWithArena _internal_metadata_;
-  friend class ::google::protobuf::Arena;
+  template <typename T> friend class ::google::protobuf::Arena::InternalHelper;
   typedef void InternalArenaConstructable_;
   typedef void DestructorSkippable_;
   ::google::protobuf::internal::ArenaStringPtr value_;
-  mutable int _cached_size_;
-  friend struct LIBPROTOBUF_EXPORT protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
+  mutable ::google::protobuf::internal::CachedSize _cached_size_;
+  friend struct ::protobuf_google_2fprotobuf_2fwrappers_2eproto::TableStruct;
 };
 // ===================================================================
 
 
 // ===================================================================
 
-#if !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif  // __GNUC__
 // DoubleValue
 
 // double value = 1;
@@ -1120,7 +1338,16 @@ inline void StringValue::set_value(const ::std::string& value) {
   value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.StringValue.value)
 }
+#if LANG_CXX11
+inline void StringValue::set_value(::std::string&& value) {
+  
+  value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.StringValue.value)
+}
+#endif
 inline void StringValue::set_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1143,13 +1370,6 @@ inline ::std::string* StringValue::release_value() {
   
   return value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* StringValue::unsafe_arena_release_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.StringValue.value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void StringValue::set_allocated_value(::std::string* value) {
   if (value != NULL) {
     
@@ -1160,6 +1380,13 @@ inline void StringValue::set_allocated_value(::std::string* value) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.StringValue.value)
 }
+inline ::std::string* StringValue::unsafe_arena_release_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.StringValue.value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void StringValue::unsafe_arena_set_allocated_value(
     ::std::string* value) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1190,7 +1417,16 @@ inline void BytesValue::set_value(const ::std::string& value) {
   value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), value, GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set:google.protobuf.BytesValue.value)
 }
+#if LANG_CXX11
+inline void BytesValue::set_value(::std::string&& value) {
+  
+  value_.Set(
+    &::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::move(value), GetArenaNoVirtual());
+  // @@protoc_insertion_point(field_set_rvalue:google.protobuf.BytesValue.value)
+}
+#endif
 inline void BytesValue::set_value(const char* value) {
+  GOOGLE_DCHECK(value != NULL);
   
   value_.Set(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), ::std::string(value),
               GetArenaNoVirtual());
@@ -1213,13 +1449,6 @@ inline ::std::string* BytesValue::release_value() {
   
   return value_.Release(&::google::protobuf::internal::GetEmptyStringAlreadyInited(), GetArenaNoVirtual());
 }
-inline ::std::string* BytesValue::unsafe_arena_release_value() {
-  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.BytesValue.value)
-  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
-  
-  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
-      GetArenaNoVirtual());
-}
 inline void BytesValue::set_allocated_value(::std::string* value) {
   if (value != NULL) {
     
@@ -1230,6 +1459,13 @@ inline void BytesValue::set_allocated_value(::std::string* value) {
       GetArenaNoVirtual());
   // @@protoc_insertion_point(field_set_allocated:google.protobuf.BytesValue.value)
 }
+inline ::std::string* BytesValue::unsafe_arena_release_value() {
+  // @@protoc_insertion_point(field_unsafe_arena_release:google.protobuf.BytesValue.value)
+  GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
+  
+  return value_.UnsafeArenaRelease(&::google::protobuf::internal::GetEmptyStringAlreadyInited(),
+      GetArenaNoVirtual());
+}
 inline void BytesValue::unsafe_arena_set_allocated_value(
     ::std::string* value) {
   GOOGLE_DCHECK(GetArenaNoVirtual() != NULL);
@@ -1243,7 +1479,9 @@ inline void BytesValue::unsafe_arena_set_allocated_value(
   // @@protoc_insertion_point(field_unsafe_arena_set_allocated:google.protobuf.BytesValue.value)
 }
 
-#endif  // !PROTOBUF_INLINE_NOT_IN_HEADERS
+#ifdef __GNUC__
+  #pragma GCC diagnostic pop
+#endif  // __GNUC__
 // -------------------------------------------------------------------
 
 // -------------------------------------------------------------------
@@ -1263,10 +1501,9 @@ inline void BytesValue::unsafe_arena_set_allocated_value(
 
 // @@protoc_insertion_point(namespace_scope)
 
-
 }  // namespace protobuf
 }  // namespace google
 
 // @@protoc_insertion_point(global_scope)
 
-#endif  // PROTOBUF_google_2fprotobuf_2fwrappers_2eproto__INCLUDED
+#endif  // PROTOBUF_INCLUDED_google_2fprotobuf_2fwrappers_2eproto
diff --git a/src/libprotobuf-lite.map b/src/libprotobuf-lite.map
new file mode 100644
index 00000000..39155466
--- /dev/null
+++ b/src/libprotobuf-lite.map
@@ -0,0 +1,9 @@
+{
+  global:
+    extern "C++" {
+      *google*;
+    };
+
+  local:
+    *;
+};
diff --git a/src/libprotobuf.map b/src/libprotobuf.map
new file mode 100644
index 00000000..39155466
--- /dev/null
+++ b/src/libprotobuf.map
@@ -0,0 +1,9 @@
+{
+  global:
+    extern "C++" {
+      *google*;
+    };
+
+  local:
+    *;
+};
diff --git a/src/libprotoc.map b/src/libprotoc.map
new file mode 100644
index 00000000..39155466
--- /dev/null
+++ b/src/libprotoc.map
@@ -0,0 +1,9 @@
+{
+  global:
+    extern "C++" {
+      *google*;
+    };
+
+  local:
+    *;
+};
diff --git a/tests.sh b/tests.sh
index 2553df71..da607281 100755
--- a/tests.sh
+++ b/tests.sh
@@ -27,6 +27,9 @@ internal_build_cpp() {
     export CXX="g++-4.8" CC="gcc-4.8"
   fi
 
+  # Initialize any submodules.
+  git submodule update --init --recursive
+
   ./autogen.sh
   ./configure CXXFLAGS="-fPIC"  # -fPIC is needed for python cpp test.
                                 # See python/setup.py for more details
@@ -35,7 +38,7 @@ internal_build_cpp() {
 
 build_cpp() {
   internal_build_cpp
-  make check -j2
+  make check -j2 || (cat src/test-suite.log; false)
   cd conformance && make test_cpp && cd ..
 
   # The benchmark code depends on cmake, so test if it is installed before
@@ -44,10 +47,7 @@ build_cpp() {
   # appears to be missing it: https://github.com/travis-ci/travis-ci/issues/6996
   if [[ $(type cmake 2>/dev/null) ]]; then
     # Verify benchmarking code can build successfully.
-    git submodule init
-    git submodule update
-    cd third_party/benchmark && cmake -DCMAKE_BUILD_TYPE=Release && make && cd ../..
-    cd benchmarks && make && ./generate-datasets && cd ..
+    cd benchmarks && make cpp-benchmark && cd ..
   else
     echo ""
     echo "WARNING: Skipping validation of the bench marking code, cmake isn't installed."
@@ -56,12 +56,14 @@ build_cpp() {
 }
 
 build_cpp_distcheck() {
+  # Initialize any submodules.
+  git submodule update --init --recursive
   ./autogen.sh
   ./configure
   make dist
 
   # List all files that should be included in the distribution package.
-  git ls-files | grep "^\(java\|python\|objectivec\|csharp\|js\|ruby\|php\|cmake\|examples\)" |\
+  git ls-files | grep "^\(java\|python\|objectivec\|csharp\|js\|ruby\|php\|cmake\|examples\|src/google/protobuf/.*\.proto\)" |\
     grep -v ".gitignore" | grep -v "java/compatibility_tests" |\
     grep -v "python/compatibility_tests" | grep -v "csharp/compatibility_tests" > dist.lst
   # Unzip the dist tar file.
@@ -87,36 +89,25 @@ build_cpp_distcheck() {
 }
 
 build_csharp() {
-  # Just for the conformance tests. We don't currently
-  # need to really build protoc, but it's simplest to keep with the
-  # conventions of the other builds.
+  # Required for conformance tests and to regenerate protos.
   internal_build_cpp
   NUGET=/usr/local/bin/nuget.exe
 
-  if [ "$TRAVIS" == "true" ]; then
-    # Install latest version of Mono
-    sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
-    sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551
-    echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
-    sudo apt-get update -qq
-    sudo apt-get install -qq mono-devel referenceassemblies-pcl nunit
-
-    # Then install the dotnet SDK as per Ubuntu 14.04 instructions on dot.net.
-    sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
-    sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
-    sudo apt-get update -qq
-    sudo apt-get install -qq dotnet-dev-1.0.0-preview2-003121
-  fi
-
   # Perform "dotnet new" once to get the setup preprocessing out of the
   # way. That spews a lot of output (including backspaces) into logs
   # otherwise, and can cause problems. It doesn't matter if this step
   # is performed multiple times; it's cheap after the first time anyway.
+  # (It also doesn't matter if it's unnecessary, which it will be on some
+  # systems. It's necessary on Jenkins in order to avoid unprintable
+  # characters appearing in the JUnit output.)
   mkdir dotnettmp
   (cd dotnettmp; dotnet new > /dev/null)
   rm -rf dotnettmp
 
-  (cd csharp/src; dotnet restore)
+  # Check that the protos haven't broken C# codegen.
+  # TODO(jonskeet): Fail if regenerating creates any changes.
+  csharp/generate_protos.sh
+
   csharp/buildall.sh
   cd conformance && make test_csharp && cd ..
 
@@ -141,7 +132,7 @@ build_golang() {
   export PATH="$GOPATH/bin:$PATH"
   go get github.com/golang/protobuf/protoc-gen-go
 
-  cd examples && make gotest && cd ..
+  cd examples && PROTO_PATH="-I../src -I." make gotest && cd ..
 }
 
 use_java() {
@@ -237,7 +228,8 @@ internal_install_python_deps() {
   fi
   # Install tox (OS X doesn't have pip).
   if [ $(uname -s) == "Darwin" ]; then
-    sudo easy_install tox
+    brew upgrade python
+    python3 -m pip install tox
   else
     sudo pip install tox
   fi
@@ -246,9 +238,10 @@ internal_install_python_deps() {
     sudo apt-get install -y python-software-properties # for apt-add-repository
     sudo apt-add-repository -y ppa:fkrull/deadsnakes
     sudo apt-get update -qq
-    sudo apt-get install -y python2.6 python2.6-dev
     sudo apt-get install -y python3.3 python3.3-dev
     sudo apt-get install -y python3.4 python3.4-dev
+    sudo apt-get install -y python3.5 python3.5-dev
+    sudo apt-get install -y python3.6 python3.6-dev
   fi
 }
 
@@ -290,7 +283,7 @@ build_python() {
   cd python
   # Only test Python 2.6/3.x on Linux
   if [ $(uname -s) == "Linux" ]; then
-    envlist=py\{26,27,33,34\}-python
+    envlist=py\{27,33,34,35,36\}-python
   else
     envlist=py27-python
   fi
@@ -304,10 +297,9 @@ build_python_cpp() {
   export LD_LIBRARY_PATH=../src/.libs # for Linux
   export DYLD_LIBRARY_PATH=../src/.libs # for OS X
   cd python
-  # Only test Python 2.6/3.x on Linux
+  # Only test Python 3.x on Linux
   if [ $(uname -s) == "Linux" ]; then
-    # py26 is currently disabled due to json_format
-    envlist=py\{27,33,34\}-cpp
+    envlist=py\{27,33,34,35,36\}-cpp
   else
     envlist=py27-cpp
   fi
@@ -350,6 +342,7 @@ build_ruby_all() {
 build_javascript() {
   internal_build_cpp
   cd js && npm install && npm test && cd ..
+  cd conformance && make test_nodejs && cd ..
 }
 
 generate_php_test_proto() {
@@ -358,9 +351,26 @@ generate_php_test_proto() {
   # Generate test file
   rm -rf generated
   mkdir generated
-  ../../src/protoc --php_out=generated proto/test.proto proto/test_include.proto proto/test_no_namespace.proto
+  ../../src/protoc --php_out=generated         \
+    proto/empty/echo.proto                     \
+    proto/test.proto                           \
+    proto/test_include.proto                   \
+    proto/test_no_namespace.proto              \
+    proto/test_prefix.proto                    \
+    proto/test_php_namespace.proto             \
+    proto/test_empty_php_namespace.proto       \
+    proto/test_reserved_enum_lower.proto       \
+    proto/test_reserved_enum_upper.proto       \
+    proto/test_reserved_enum_value_lower.proto \
+    proto/test_reserved_enum_value_upper.proto \
+    proto/test_reserved_message_lower.proto    \
+    proto/test_reserved_message_upper.proto    \
+    proto/test_service.proto                   \
+    proto/test_service_namespace.proto         \
+    proto/test_descriptors.proto
   pushd ../../src
-  ./protoc --php_out=../php/tests/generated google/protobuf/empty.proto
+  ./protoc --php_out=../php/tests/generated -I../php/tests -I. \
+    ../php/tests/proto/test_import_descriptor_proto.proto
   popd
   popd
 }
@@ -370,12 +380,9 @@ use_php() {
   PHP=`which php`
   PHP_CONFIG=`which php-config`
   PHPIZE=`which phpize`
-  rm $PHP
-  rm $PHP_CONFIG
-  rm $PHPIZE
-  cp "/usr/bin/php$VERSION" $PHP
-  cp "/usr/bin/php-config$VERSION" $PHP_CONFIG
-  cp "/usr/bin/phpize$VERSION" $PHPIZE
+  ln -sfn "/usr/local/php-${VERSION}/bin/php" $PHP
+  ln -sfn "/usr/local/php-${VERSION}/bin/php-config" $PHP_CONFIG
+  ln -sfn "/usr/local/php-${VERSION}/bin/phpize" $PHPIZE
   generate_php_test_proto
 }
 
@@ -402,70 +409,38 @@ use_php_bc() {
 }
 
 build_php5.5() {
-  PHP=`which php`
-  PHP_CONFIG=`which php-config`
-  PHPIZE=`which phpize`
-  ln -sfn "/usr/local/php-5.5/bin/php" $PHP
-  ln -sfn "/usr/local/php-5.5/bin/php-config" $PHP_CONFIG
-  ln -sfn "/usr/local/php-5.5/bin/phpize" $PHPIZE
-  generate_php_test_proto
+  use_php 5.5
 
   pushd php
   rm -rf vendor
   cp -r /usr/local/vendor-5.5 vendor
-  ./vendor/bin/phpunit
+  wget https://phar.phpunit.de/phpunit-4.8.0.phar -O /usr/bin/phpunit
+  phpunit
   popd
   pushd conformance
-  # TODO(teboring): Add it back
-  # make test_php
+  make test_php
   popd
 }
 
 build_php5.5_c() {
-  PHP=`which php`
-  PHP_CONFIG=`which php-config`
-  PHPIZE=`which phpize`
-  ln -sfn "/usr/local/php-5.5/bin/php" $PHP
-  ln -sfn "/usr/local/php-5.5/bin/php-config" $PHP_CONFIG
-  ln -sfn "/usr/local/php-5.5/bin/phpize" $PHPIZE
-  generate_php_test_proto
-  wget https://phar.phpunit.de/phpunit-old.phar -O /usr/bin/phpunit
-
-  cd php/tests && /bin/bash ./test.sh && cd ../..
-  pushd conformance
-  make test_php_c
-  popd
-}
-
-build_php5.5_zts_c() {
-  use_php_zts 5.5
-  wget https://phar.phpunit.de/phpunit-old.phar -O /usr/bin/phpunit
-  cd php/tests && /bin/bash ./test.sh && cd ../..
-  pushd conformance
-  make test_php_c
-  popd
-}
-
-build_php5.5_32() {
-  use_php_bc 5.5
-  pushd php
-  rm -rf vendor
-  cp -r /usr/local/vendor-5.5 vendor
-  ./vendor/bin/phpunit
+  use_php 5.5
+  wget https://phar.phpunit.de/phpunit-4.8.0.phar -O /usr/bin/phpunit
+  pushd php/tests
+  /bin/bash ./test.sh 5.5
   popd
-  # TODO(teboring): Add conformance test.
+  # TODO(teboring): Add it back
   # pushd conformance
-  # make test_php
+  # make test_php_c
   # popd
 }
 
-build_php5.5_c_32() {
-  use_php_bc 5.5
-  wget https://phar.phpunit.de/phpunit-old.phar -O /usr/bin/phpunit
-  cd php/tests && /bin/bash ./test.sh && cd ../..
-  # TODO(teboring): Add conformance test.
+build_php5.5_zts_c() {
+  use_php_zts 5.5
+  wget https://phar.phpunit.de/phpunit-4.8.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 5.5-zts && cd ../..
+  # TODO(teboring): Add it back
   # pushd conformance
-  # make test_php_c
+  # make test_php_zts_c
   # popd
 }
 
@@ -474,20 +449,32 @@ build_php5.6() {
   pushd php
   rm -rf vendor
   cp -r /usr/local/vendor-5.6 vendor
-  ./vendor/bin/phpunit
+  wget https://phar.phpunit.de/phpunit-5.7.0.phar -O /usr/bin/phpunit
+  phpunit
   popd
   pushd conformance
-  # TODO(teboring): Add it back
-  # make test_php
+  make test_php
   popd
 }
 
 build_php5.6_c() {
   use_php 5.6
-  cd php/tests && /bin/bash ./test.sh && cd ../..
-  pushd conformance
-  make test_php_c
-  popd
+  wget https://phar.phpunit.de/phpunit-5.7.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 5.6 && cd ../..
+  # TODO(teboring): Add it back
+  # pushd conformance
+  # make test_php_c
+  # popd
+}
+
+build_php5.6_zts_c() {
+  use_php_zts 5.6
+  wget https://phar.phpunit.de/phpunit-5.7.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 5.6-zts && cd ../..
+  # TODO(teboring): Add it back
+  # pushd conformance
+  # make test_php_zts_c
+  # popd
 }
 
 build_php5.6_mac() {
@@ -509,9 +496,10 @@ build_php5.6_mac() {
 
   # Test
   cd php/tests && /bin/bash ./test.sh && cd ../..
-  pushd conformance
-  make test_php_c
-  popd
+  # TODO(teboring): Add it back
+  # pushd conformance
+  # make test_php_c
+  # popd
 }
 
 build_php7.0() {
@@ -519,35 +507,114 @@ build_php7.0() {
   pushd php
   rm -rf vendor
   cp -r /usr/local/vendor-7.0 vendor
-  ./vendor/bin/phpunit
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  phpunit
   popd
   pushd conformance
-  # TODO(teboring): Add it back
-  # make test_php
+  make test_php
   popd
 }
 
 build_php7.0_c() {
   use_php 7.0
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 7.0 && cd ../..
+  # TODO(teboring): Add it back
+  # pushd conformance
+  # make test_php_c
+  # popd
+}
+
+build_php7.0_zts_c() {
+  use_php_zts 7.0
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 7.0-zts && cd ../..
+  # TODO(teboring): Add it back.
+  # pushd conformance
+  # make test_php_zts_c
+  # popd
+}
+
+build_php7.0_mac() {
+  generate_php_test_proto
+  # Install PHP
+  curl -s https://php-osx.liip.ch/install.sh | bash -s 7.0
+  PHP_FOLDER=`find /usr/local -type d -name "php7-7.0*"`  # The folder name may change upon time
+  export PATH="$PHP_FOLDER/bin:$PATH"
+
+  # Install phpunit
+  curl https://phar.phpunit.de/phpunit-5.6.0.phar -L -o phpunit.phar
+  chmod +x phpunit.phar
+  sudo mv phpunit.phar /usr/local/bin/phpunit
+
+  # Install valgrind
+  echo "#! /bin/bash" > valgrind
+  chmod ug+x valgrind
+  sudo mv valgrind /usr/local/bin/valgrind
+
+  # Test
   cd php/tests && /bin/bash ./test.sh && cd ../..
+  # TODO(teboring): Add it back
+  # pushd conformance
+  # make test_php_c
+  # popd
+}
+
+build_php_compatibility() {
+  internal_build_cpp
+  php/tests/compatibility_test.sh
+}
+
+build_php7.1() {
+  use_php 7.1
+  pushd php
+  rm -rf vendor
+  cp -r /usr/local/vendor-7.1 vendor
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  phpunit
+  popd
   pushd conformance
-  make test_php_c
+  # TODO(teboring): Add it back
+  # make test_php
   popd
 }
 
-build_php_all() {
+build_php7.1_c() {
+  use_php 7.1
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 7.1 && cd ../..
+  pushd conformance
+  # make test_php_c
+  popd
+}
+
+build_php7.1_zts_c() {
+  use_php_zts 7.1
+  wget https://phar.phpunit.de/phpunit-5.6.0.phar -O /usr/bin/phpunit
+  cd php/tests && /bin/bash ./test.sh 7.1-zts && cd ../..
+  pushd conformance
+  # make test_php_c
+  popd
+}
+
+build_php_all_32() {
   build_php5.5
   build_php5.6
   build_php7.0
+  build_php7.1
   build_php5.5_c
   build_php5.6_c
-  # build_php7.0_c
+  build_php7.0_c
+  build_php7.1_c
   build_php5.5_zts_c
+  build_php5.6_zts_c
+  build_php7.0_zts_c
+  build_php7.1_zts_c
 }
 
-build_php_all_32() {
-  build_php5.5_32
-  build_php5.5_c_32
+build_php_all() {
+  build_php_all_32
+  build_php_compatibility
 }
 
 # Note: travis currently does not support testing more than one language so the
@@ -588,6 +655,9 @@ Usage: $0 { cpp |
             php5.6_c |
             php7.0   |
             php7.0_c |
+            php_compatibility |
+            php7.1   |
+            php7.1_c |
             php_all)
 "
   exit 1
diff --git a/third_party/benchmark b/third_party/benchmark
-Subproject 360e66c1c4777c99402cf8cd535aa510fee1657
+Subproject 5b7683f49e1e9223cf9927b24f6fd3d6bd82e3f
diff --git a/third_party/googletest b/third_party/googletest
new file mode 160000
+Subproject c3bb0ee2a63279a803aaad956b9b26d74bf9e6e
diff --git a/update_file_lists.sh b/update_file_lists.sh
index d76a1610..646c8ce3 100755
--- a/update_file_lists.sh
+++ b/update_file_lists.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # This script copies source file lists from src/Makefile.am to cmake files.
 
@@ -24,7 +24,7 @@ get_header_files() {
 }
 
 get_source_files() {
-  get_variable_value $@ | grep "cc$"
+  get_variable_value $@ | grep "cc$\|inc$"
 }
 
 get_proto_files_blacklisted() {
@@ -55,6 +55,7 @@ PUBLIC_HEADERS=$(sort_files $GZHEADERS $HEADERS)
 LIBPROTOBUF_LITE_SOURCES=$(get_source_files $MAKEFILE libprotobuf_lite_la_SOURCES)
 LIBPROTOBUF_SOURCES=$(get_source_files $MAKEFILE libprotobuf_la_SOURCES)
 LIBPROTOC_SOURCES=$(get_source_files $MAKEFILE libprotoc_la_SOURCES)
+LIBPROTOC_HEADERS=$(get_header_files $MAKEFILE libprotoc_la_SOURCES)
 LITE_PROTOS=$(get_proto_files $MAKEFILE protoc_lite_outputs)
 PROTOS=$(get_proto_files $MAKEFILE protoc_outputs)
 PROTOS_BLACKLISTED=$(get_proto_files_blacklisted $MAKEFILE protoc_outputs)
@@ -116,6 +117,7 @@ CMAKE_PREFIX="\${protobuf_source_dir}/src/"
 set_cmake_value $CMAKE_DIR/libprotobuf-lite.cmake libprotobuf_lite_files $CMAKE_PREFIX $LIBPROTOBUF_LITE_SOURCES
 set_cmake_value $CMAKE_DIR/libprotobuf.cmake libprotobuf_files $CMAKE_PREFIX $LIBPROTOBUF_SOURCES
 set_cmake_value $CMAKE_DIR/libprotoc.cmake libprotoc_files $CMAKE_PREFIX $LIBPROTOC_SOURCES
+set_cmake_value $CMAKE_DIR/libprotoc.cmake libprotoc_headers $CMAKE_PREFIX $LIBPROTOC_HEADERS
 set_cmake_value $CMAKE_DIR/tests.cmake lite_test_protos "" $LITE_PROTOS
 set_cmake_value $CMAKE_DIR/tests.cmake tests_protos "" $PROTOS_BLACKLISTED
 set_cmake_value $CMAKE_DIR/tests.cmake common_test_files $CMAKE_PREFIX $COMMON_TEST_SOURCES
@@ -126,16 +128,16 @@ set_cmake_value $CMAKE_DIR/tests.cmake lite_arena_test_files $CMAKE_PREFIX $LITE
 
 # Generate extract_includes.bat
 echo "mkdir include" > $EXTRACT_INCLUDES_BAT
-for HEADER in $PUBLIC_HEADERS; do
-  HEADER_DIR=$(dirname $HEADER)
-  while [ ! "$HEADER_DIR" = "." ]; do
-    echo $HEADER_DIR | sed "s/\\//\\\\/g"
-    HEADER_DIR=$(dirname $HEADER_DIR)
+for INCLUDE in $PUBLIC_HEADERS $WKT_PROTOS; do
+  INCLUDE_DIR=$(dirname "$INCLUDE")
+  while [ ! "$INCLUDE_DIR" = "." ]; do
+    echo "mkdir include\\${INCLUDE_DIR//\//\\}"
+    INCLUDE_DIR=$(dirname "$INCLUDE_DIR")
   done
-done | sort | uniq | sed "s/^/mkdir include\\\\/" >> $EXTRACT_INCLUDES_BAT
-for HEADER in $PUBLIC_HEADERS; do
-  WINPATH=$(echo $HEADER | sed 's;/;\\;g')
-  echo "copy \${PROTOBUF_SOURCE_WIN32_PATH}\\..\\src\\$WINPATH include\\$WINPATH" >> $EXTRACT_INCLUDES_BAT
+done | sort | uniq >> $EXTRACT_INCLUDES_BAT
+for INCLUDE in $PUBLIC_HEADERS $WKT_PROTOS; do
+  WINPATH=${INCLUDE//\//\\}
+  echo "copy \"\${PROTOBUF_SOURCE_WIN32_PATH}\\..\\src\\$WINPATH\" include\\$WINPATH" >> $EXTRACT_INCLUDES_BAT
 done
 
 ################################################################################